Pull x86 platform driver updates from Hans de Goede: "Highlights: - Microsoft Surface devices System Aggregator Module support - SW_TABLET_MODE reporting improvements - thinkpad_acpi keyboard language setting support - platform / DPTF profile settings support: - Base / userspace API parts merged from Rafael's acpi-platform branch - thinkpad_acpi and ideapad-laptop support through pdx86 - Remove support for some obsolete Intel MID platforms through merging of the shared intel-mid-removal branch - Big cleanup of the ideapad-laptop driver - Misc other fixes / new hw support / quirks" * tag 'platform-drivers-x86-v5.12-1' of git://git.kernel.org/pub/scm/linux/kernel/git/pdx86/platform-drivers-x86: (99 commits) platform/x86: intel_scu_ipc: Increase virtual timeout from 3 to 5 seconds platform/surface: aggregator: Fix access of unaligned value tools/power/x86/intel-speed-select: Update version to 1.8 tools/power/x86/intel-speed-select: Add new command to get/set TRL tools/power/x86/intel-speed-select: Add new command turbo-mode Platform: OLPC: Constify static struct regulator_ops platform/surface: Add Surface Hot-Plug driver platform/x86: intel_scu_wdt: Drop mistakenly added const platform/x86: Kconfig: add missing selects for ideapad-laptop platform/x86: acer-wmi: Don't use ACPI_EXCEPTION() platform/x86: thinkpad_acpi: Replace ifdef CONFIG_ACPI_PLATFORM_PROFILE with depends on platform/x86: thinkpad_acpi: Fix 'warning: no previous prototype for' warnings platform/x86: msi-wmi: Fix variable 'status' set but not used compiler warning platform/surface: surface3-wmi: Fix variable 'status' set but not used compiler warning platform/x86: Move all dell drivers to their own subdirectory Documentation/ABI: sysfs-platform-ideapad-laptop: conservation_mode attribute Documentation/ABI: sysfs-platform-ideapad-laptop: update device attribute paths platform/x86: ideapad-laptop: add "always on USB charging" control support platform/x86: ideapad-laptop: add keyboard backlight control support platform/x86: ideapad-laptop: send notification about touchpad state change to sysfs ...
Unified · Split
| @@ -1,11 +1,11 @@ | |||
| 1 | What: /sys/devices/platform/ideapad/camera_power | 1 | What: /sys/bus/platform/devices/VPC2004:*/camera_power |
| 2 | Date: Dec 2010 | 2 | Date: Dec 2010 |
| 3 | KernelVersion: 2.6.37 | 3 | KernelVersion: 2.6.37 |
| 4 | Contact: "Ike Panhc <ike.pan@canonical.com>" | 4 | Contact: "Ike Panhc <ike.pan@canonical.com>" |
| 5 | Description: | 5 | Description: |
| 6 | Control the power of camera module. 1 means on, 0 means off. | 6 | Control the power of camera module. 1 means on, 0 means off. |
| 7 | 7 | ||
| 8 | What: /sys/devices/platform/ideapad/fan_mode | 8 | What: /sys/bus/platform/devices/VPC2004:*/fan_mode |
| 9 | Date: June 2012 | 9 | Date: June 2012 |
| 10 | KernelVersion: 3.6 | 10 | KernelVersion: 3.6 |
| 11 | Contact: "Maxim Mikityanskiy <maxtram95@gmail.com>" | 11 | Contact: "Maxim Mikityanskiy <maxtram95@gmail.com>" |
| @@ -18,7 +18,7 @@ Description: · 6 unmodified lines | |||
| 18 | * 2 -> Dust Cleaning | 18 | * 2 -> Dust Cleaning |
| 19 | * 4 -> Efficient Thermal Dissipation Mode | 19 | * 4 -> Efficient Thermal Dissipation Mode |
| 20 | 20 | ||
| 21 | What: /sys/devices/platform/ideapad/touchpad | 21 | What: /sys/bus/platform/devices/VPC2004:*/touchpad |
| 22 | Date: May 2017 | 22 | Date: May 2017 |
| 23 | KernelVersion: 4.13 | 23 | KernelVersion: 4.13 |
| 24 | Contact: "Ritesh Raj Sarraf <rrs@debian.org>" | 24 | Contact: "Ritesh Raj Sarraf <rrs@debian.org>" |
| @@ -27,7 +27,16 @@ Description: · 2 unmodified lines | |||
| 27 | * 1 -> Switched On | 27 | * 1 -> Switched On |
| 28 | * 0 -> Switched Off | 28 | * 0 -> Switched Off |
| 29 | 29 | ||
| 30 | What: /sys/bus/pci/devices/<bdf>/<device>/VPC2004:00/fn_lock | 30 | What: /sys/bus/platform/devices/VPC2004:*/conservation_mode |
| 31 | Date: Aug 2017 | ||
| 32 | KernelVersion: 4.14 | ||
| 33 | Contact: platform-driver-x86@vger.kernel.org | ||
| 34 | Description: | ||
| 35 | Controls whether the conservation mode is enabled or not. | ||
| 36 | This feature limits the maximum battery charge percentage to | ||
| 37 | around 50-60% in order to prolong the lifetime of the battery. | ||
| 38 | |||
| 39 | What: /sys/bus/platform/devices/VPC2004:*/fn_lock | ||
| 31 | Date: May 2018 | 40 | Date: May 2018 |
| 32 | KernelVersion: 4.18 | 41 | KernelVersion: 4.18 |
| 33 | Contact: "Oleg Keri <ezhi99@gmail.com>" | 42 | Contact: "Oleg Keri <ezhi99@gmail.com>" |
| @@ -41,3 +50,12 @@ Description: · 7 unmodified lines | |||
| 41 | 50 | ||
| 42 | # echo "0" > \ | 51 | # echo "0" > \ |
| 43 | /sys/bus/pci/devices/0000:00:1f.0/PNP0C09:00/VPC2004:00/fn_lock | 52 | /sys/bus/pci/devices/0000:00:1f.0/PNP0C09:00/VPC2004:00/fn_lock |
| 53 | |||
| 54 | What: /sys/bus/platform/devices/VPC2004:*/usb_charging | ||
| 55 | Date: Feb 2021 | ||
| 56 | KernelVersion: 5.12 | ||
| 57 | Contact: platform-driver-x86@vger.kernel.org | ||
| 58 | Description: | ||
| 59 | Controls whether the "always on USB charging" feature is | ||
| 60 | enabled or not. This feature enables charging USB devices | ||
| 61 | even if the computer is not turned on. | ||
| @@ -51,6 +51,7 @@ detailed description): · 50 unmodified lines | |||
| 51 | - UWB enable and disable | 51 | - UWB enable and disable |
| 52 | - LCD Shadow (PrivacyGuard) enable and disable | 52 | - LCD Shadow (PrivacyGuard) enable and disable |
| 53 | - Lap mode sensor | 53 | - Lap mode sensor |
| 54 | - Setting keyboard language | ||
| 54 | 55 | ||
| 55 | A compatibility table by model and feature is maintained on the web | 56 | A compatibility table by model and feature is maintained on the web |
| 56 | site, http://ibm-acpi.sf.net/. I appreciate any success or failure | 57 | site, http://ibm-acpi.sf.net/. I appreciate any success or failure |
| @@ -1466,6 +1467,30 @@ Sysfs notes · 1409 unmodified lines | |||
| 1466 | rfkill controller switch "tpacpi_uwb_sw": refer to | 1467 | rfkill controller switch "tpacpi_uwb_sw": refer to |
| 1467 | Documentation/driver-api/rfkill.rst for details. | 1468 | Documentation/driver-api/rfkill.rst for details. |
| 1468 | 1469 | ||
| 1470 | |||
| 1471 | Setting keyboard language | ||
| 1472 | ------------------------- | ||
| 1473 | |||
| 1474 | sysfs: keyboard_lang | ||
| 1475 | |||
| 1476 | This feature is used to set keyboard language to ECFW using ASL interface. | ||
| 1477 | Fewer thinkpads models like T580 , T590 , T15 Gen 1 etc.. has "=", "(', | ||
| 1478 | ")" numeric keys, which are not displaying correctly, when keyboard language | ||
| 1479 | is other than "english". This is because the default keyboard language in ECFW | ||
| 1480 | is set as "english". Hence using this sysfs, user can set the correct keyboard | ||
| 1481 | language to ECFW and then these key's will work correctly. | ||
| 1482 | |||
| 1483 | Example of command to set keyboard language is mentioned below:: | ||
| 1484 | |||
| 1485 | echo jp > /sys/devices/platform/thinkpad_acpi/keyboard_lang | ||
| 1486 | |||
| 1487 | Text corresponding to keyboard layout to be set in sysfs are: be(Belgian), | ||
| 1488 | cz(Czech), da(Danish), de(German), en(English), es(Spain), et(Estonian), | ||
| 1489 | fr(French), fr-ch(French(Switzerland)), hu(Hungarian), it(Italy), jp (Japan), | ||
| 1490 | nl(Dutch), nn(Norway), pl(Polish), pt(portugese), sl(Slovenian), sv(Sweden), | ||
| 1491 | tr(Turkey) | ||
| 1492 | |||
| 1493 | |||
| 1469 | Adaptive keyboard | 1494 | Adaptive keyboard |
| 1470 | ----------------- | 1495 | ----------------- |
| 1471 | 1496 | ||
| @@ -99,6 +99,7 @@ available subsections can be seen below. · 98 unmodified lines | |||
| 99 | rfkill | 99 | rfkill |
| 100 | serial/index | 100 | serial/index |
| 101 | sm501 | 101 | sm501 |
| 102 | surface_aggregator/index | ||
| 102 | switchtec | 103 | switchtec |
| 103 | sync_file | 104 | sync_file |
| 104 | vfio-mediated-device | 105 | vfio-mediated-device |
| @@ -0,0 +1,38 @@ | |||
| 1 | .. SPDX-License-Identifier: GPL-2.0+ | ||
| 2 | |||
| 3 | =============================== | ||
| 4 | Client Driver API Documentation | ||
| 5 | =============================== | ||
| 6 | |||
| 7 | .. contents:: | ||
| 8 | :depth: 2 | ||
| 9 | |||
| 10 | |||
| 11 | Serial Hub Communication | ||
| 12 | ======================== | ||
| 13 | |||
| 14 | .. kernel-doc:: include/linux/surface_aggregator/serial_hub.h | ||
| 15 | |||
| 16 | .. kernel-doc:: drivers/platform/surface/aggregator/ssh_packet_layer.c | ||
| 17 | :export: | ||
| 18 | |||
| 19 | |||
| 20 | Controller and Core Interface | ||
| 21 | ============================= | ||
| 22 | |||
| 23 | .. kernel-doc:: include/linux/surface_aggregator/controller.h | ||
| 24 | |||
| 25 | .. kernel-doc:: drivers/platform/surface/aggregator/controller.c | ||
| 26 | :export: | ||
| 27 | |||
| 28 | .. kernel-doc:: drivers/platform/surface/aggregator/core.c | ||
| 29 | :export: | ||
| 30 | |||
| 31 | |||
| 32 | Client Bus and Client Device API | ||
| 33 | ================================ | ||
| 34 | |||
| 35 | .. kernel-doc:: include/linux/surface_aggregator/device.h | ||
| 36 | |||
| 37 | .. kernel-doc:: drivers/platform/surface/aggregator/bus.c | ||
| 38 | :export: | ||
| @@ -0,0 +1,393 @@ | |||
| 1 | .. SPDX-License-Identifier: GPL-2.0+ | ||
| 2 | |||
| 3 | .. |ssam_controller| replace:: :c:type:`struct ssam_controller <ssam_controller>` | ||
| 4 | .. |ssam_device| replace:: :c:type:`struct ssam_device <ssam_device>` | ||
| 5 | .. |ssam_device_driver| replace:: :c:type:`struct ssam_device_driver <ssam_device_driver>` | ||
| 6 | .. |ssam_client_bind| replace:: :c:func:`ssam_client_bind` | ||
| 7 | .. |ssam_client_link| replace:: :c:func:`ssam_client_link` | ||
| 8 | .. |ssam_get_controller| replace:: :c:func:`ssam_get_controller` | ||
| 9 | .. |ssam_controller_get| replace:: :c:func:`ssam_controller_get` | ||
| 10 | .. |ssam_controller_put| replace:: :c:func:`ssam_controller_put` | ||
| 11 | .. |ssam_device_alloc| replace:: :c:func:`ssam_device_alloc` | ||
| 12 | .. |ssam_device_add| replace:: :c:func:`ssam_device_add` | ||
| 13 | .. |ssam_device_remove| replace:: :c:func:`ssam_device_remove` | ||
| 14 | .. |ssam_device_driver_register| replace:: :c:func:`ssam_device_driver_register` | ||
| 15 | .. |ssam_device_driver_unregister| replace:: :c:func:`ssam_device_driver_unregister` | ||
| 16 | .. |module_ssam_device_driver| replace:: :c:func:`module_ssam_device_driver` | ||
| 17 | .. |SSAM_DEVICE| replace:: :c:func:`SSAM_DEVICE` | ||
| 18 | .. |ssam_notifier_register| replace:: :c:func:`ssam_notifier_register` | ||
| 19 | .. |ssam_notifier_unregister| replace:: :c:func:`ssam_notifier_unregister` | ||
| 20 | .. |ssam_request_sync| replace:: :c:func:`ssam_request_sync` | ||
| 21 | .. |ssam_event_mask| replace:: :c:type:`enum ssam_event_mask <ssam_event_mask>` | ||
| 22 | |||
| 23 | |||
| 24 | ====================== | ||
| 25 | Writing Client Drivers | ||
| 26 | ====================== | ||
| 27 | |||
| 28 | For the API documentation, refer to: | ||
| 29 | |||
| 30 | .. toctree:: | ||
| 31 | :maxdepth: 2 | ||
| 32 | |||
| 33 | client-api | ||
| 34 | |||
| 35 | |||
| 36 | Overview | ||
| 37 | ======== | ||
| 38 | |||
| 39 | Client drivers can be set up in two main ways, depending on how the | ||
| 40 | corresponding device is made available to the system. We specifically | ||
| 41 | differentiate between devices that are presented to the system via one of | ||
| 42 | the conventional ways, e.g. as platform devices via ACPI, and devices that | ||
| 43 | are non-discoverable and instead need to be explicitly provided by some | ||
| 44 | other mechanism, as discussed further below. | ||
| 45 | |||
| 46 | |||
| 47 | Non-SSAM Client Drivers | ||
| 48 | ======================= | ||
| 49 | |||
| 50 | All communication with the SAM EC is handled via the |ssam_controller| | ||
| 51 | representing that EC to the kernel. Drivers targeting a non-SSAM device (and | ||
| 52 | thus not being a |ssam_device_driver|) need to explicitly establish a | ||
| 53 | connection/relation to that controller. This can be done via the | ||
| 54 | |ssam_client_bind| function. Said function returns a reference to the SSAM | ||
| 55 | controller, but, more importantly, also establishes a device link between | ||
| 56 | client device and controller (this can also be done separate via | ||
| 57 | |ssam_client_link|). It is important to do this, as it, first, guarantees | ||
| 58 | that the returned controller is valid for use in the client driver for as | ||
| 59 | long as this driver is bound to its device, i.e. that the driver gets | ||
| 60 | unbound before the controller ever becomes invalid, and, second, as it | ||
| 61 | ensures correct suspend/resume ordering. This setup should be done in the | ||
| 62 | driver's probe function, and may be used to defer probing in case the SSAM | ||
| 63 | subsystem is not ready yet, for example: | ||
| 64 | |||
| 65 | .. code-block:: c | ||
| 66 | |||
| 67 | static int client_driver_probe(struct platform_device *pdev) | ||
| 68 | { | ||
| 69 | struct ssam_controller *ctrl; | ||
| 70 | |||
| 71 | ctrl = ssam_client_bind(&pdev->dev); | ||
| 72 | if (IS_ERR(ctrl)) | ||
| 73 | return PTR_ERR(ctrl) == -ENODEV ? -EPROBE_DEFER : PTR_ERR(ctrl); | ||
| 74 | |||
| 75 | // ... | ||
| 76 | |||
| 77 | return 0; | ||
| 78 | } | ||
| 79 | |||
| 80 | The controller may be separately obtained via |ssam_get_controller| and its | ||
| 81 | lifetime be guaranteed via |ssam_controller_get| and |ssam_controller_put|. | ||
| 82 | Note that none of these functions, however, guarantee that the controller | ||
| 83 | will not be shut down or suspended. These functions essentially only operate | ||
| 84 | on the reference, i.e. only guarantee a bare minimum of accessibility | ||
| 85 | without any guarantees at all on practical operability. | ||
| 86 | |||
| 87 | |||
| 88 | Adding SSAM Devices | ||
| 89 | =================== | ||
| 90 | |||
| 91 | If a device does not already exist/is not already provided via conventional | ||
| 92 | means, it should be provided as |ssam_device| via the SSAM client device | ||
| 93 | hub. New devices can be added to this hub by entering their UID into the | ||
| 94 | corresponding registry. SSAM devices can also be manually allocated via | ||
| 95 | |ssam_device_alloc|, subsequently to which they have to be added via | ||
| 96 | |ssam_device_add| and eventually removed via |ssam_device_remove|. By | ||
| 97 | default, the parent of the device is set to the controller device provided | ||
| 98 | for allocation, however this may be changed before the device is added. Note | ||
| 99 | that, when changing the parent device, care must be taken to ensure that the | ||
| 100 | controller lifetime and suspend/resume ordering guarantees, in the default | ||
| 101 | setup provided through the parent-child relation, are preserved. If | ||
| 102 | necessary, by use of |ssam_client_link| as is done for non-SSAM client | ||
| 103 | drivers and described in more detail above. | ||
| 104 | |||
| 105 | A client device must always be removed by the party which added the | ||
| 106 | respective device before the controller shuts down. Such removal can be | ||
| 107 | guaranteed by linking the driver providing the SSAM device to the controller | ||
| 108 | via |ssam_client_link|, causing it to unbind before the controller driver | ||
| 109 | unbinds. Client devices registered with the controller as parent are | ||
| 110 | automatically removed when the controller shuts down, but this should not be | ||
| 111 | relied upon, especially as this does not extend to client devices with a | ||
| 112 | different parent. | ||
| 113 | |||
| 114 | |||
| 115 | SSAM Client Drivers | ||
| 116 | =================== | ||
| 117 | |||
| 118 | SSAM client device drivers are, in essence, no different than other device | ||
| 119 | driver types. They are represented via |ssam_device_driver| and bind to a | ||
| 120 | |ssam_device| via its UID (:c:type:`struct ssam_device.uid <ssam_device>`) | ||
| 121 | member and the match table | ||
| 122 | (:c:type:`struct ssam_device_driver.match_table <ssam_device_driver>`), | ||
| 123 | which should be set when declaring the driver struct instance. Refer to the | ||
| 124 | |SSAM_DEVICE| macro documentation for more details on how to define members | ||
| 125 | of the driver's match table. | ||
| 126 | |||
| 127 | The UID for SSAM client devices consists of a ``domain``, a ``category``, | ||
| 128 | a ``target``, an ``instance``, and a ``function``. The ``domain`` is used | ||
| 129 | differentiate between physical SAM devices | ||
| 130 | (:c:type:`SSAM_DOMAIN_SERIALHUB <ssam_device_domain>`), i.e. devices that can | ||
| 131 | be accessed via the Surface Serial Hub, and virtual ones | ||
| 132 | (:c:type:`SSAM_DOMAIN_VIRTUAL <ssam_device_domain>`), such as client-device | ||
| 133 | hubs, that have no real representation on the SAM EC and are solely used on | ||
| 134 | the kernel/driver-side. For physical devices, ``category`` represents the | ||
| 135 | target category, ``target`` the target ID, and ``instance`` the instance ID | ||
| 136 | used to access the physical SAM device. In addition, ``function`` references | ||
| 137 | a specific device functionality, but has no meaning to the SAM EC. The | ||
| 138 | (default) name of a client device is generated based on its UID. | ||
| 139 | |||
| 140 | A driver instance can be registered via |ssam_device_driver_register| and | ||
| 141 | unregistered via |ssam_device_driver_unregister|. For convenience, the | ||
| 142 | |module_ssam_device_driver| macro may be used to define module init- and | ||
| 143 | exit-functions registering the driver. | ||
| 144 | |||
| 145 | The controller associated with a SSAM client device can be found in its | ||
| 146 | :c:type:`struct ssam_device.ctrl <ssam_device>` member. This reference is | ||
| 147 | guaranteed to be valid for at least as long as the client driver is bound, | ||
| 148 | but should also be valid for as long as the client device exists. Note, | ||
| 149 | however, that access outside of the bound client driver must ensure that the | ||
| 150 | controller device is not suspended while making any requests or | ||
| 151 | (un-)registering event notifiers (and thus should generally be avoided). This | ||
| 152 | is guaranteed when the controller is accessed from inside the bound client | ||
| 153 | driver. | ||
| 154 | |||
| 155 | |||
| 156 | Making Synchronous Requests | ||
| 157 | =========================== | ||
| 158 | |||
| 159 | Synchronous requests are (currently) the main form of host-initiated | ||
| 160 | communication with the EC. There are a couple of ways to define and execute | ||
| 161 | such requests, however, most of them boil down to something similar as shown | ||
| 162 | in the example below. This example defines a write-read request, meaning | ||
| 163 | that the caller provides an argument to the SAM EC and receives a response. | ||
| 164 | The caller needs to know the (maximum) length of the response payload and | ||
| 165 | provide a buffer for it. | ||
| 166 | |||
| 167 | Care must be taken to ensure that any command payload data passed to the SAM | ||
| 168 | EC is provided in little-endian format and, similarly, any response payload | ||
| 169 | data received from it is converted from little-endian to host endianness. | ||
| 170 | |||
| 171 | .. code-block:: c | ||
| 172 | |||
| 173 | int perform_request(struct ssam_controller *ctrl, u32 arg, u32 *ret) | ||
| 174 | { | ||
| 175 | struct ssam_request rqst; | ||
| 176 | struct ssam_response resp; | ||
| 177 | int status; | ||
| 178 | |||
| 179 | /* Convert request argument to little-endian. */ | ||
| 180 | __le32 arg_le = cpu_to_le32(arg); | ||
| 181 | __le32 ret_le = cpu_to_le32(0); | ||
| 182 | |||
| 183 | /* | ||
| 184 | * Initialize request specification. Replace this with your values. | ||
| 185 | * The rqst.payload field may be NULL if rqst.length is zero, | ||
| 186 | * indicating that the request does not have any argument. | ||
| 187 | * | ||
| 188 | * Note: The request parameters used here are not valid, i.e. | ||
| 189 | * they do not correspond to an actual SAM/EC request. | ||
| 190 | */ | ||
| 191 | rqst.target_category = SSAM_SSH_TC_SAM; | ||
| 192 | rqst.target_id = 0x01; | ||
| 193 | rqst.command_id = 0x02; | ||
| 194 | rqst.instance_id = 0x03; | ||
| 195 | rqst.flags = SSAM_REQUEST_HAS_RESPONSE; | ||
| 196 | rqst.length = sizeof(arg_le); | ||
| 197 | rqst.payload = (u8 *)&arg_le; | ||
| 198 | |||
| 199 | /* Initialize request response. */ | ||
| 200 | resp.capacity = sizeof(ret_le); | ||
| 201 | resp.length = 0; | ||
| 202 | resp.pointer = (u8 *)&ret_le; | ||
| 203 | |||
| 204 | /* | ||
| 205 | * Perform actual request. The response pointer may be null in case | ||
| 206 | * the request does not have any response. This must be consistent | ||
| 207 | * with the SSAM_REQUEST_HAS_RESPONSE flag set in the specification | ||
| 208 | * above. | ||
| 209 | */ | ||
| 210 | status = ssam_request_sync(ctrl, &rqst, &resp); | ||
| 211 | |||
| 212 | /* | ||
| 213 | * Alternatively use | ||
| 214 | * | ||
| 215 | * ssam_request_sync_onstack(ctrl, &rqst, &resp, sizeof(arg_le)); | ||
| 216 | * | ||
| 217 | * to perform the request, allocating the message buffer directly | ||
| 218 | * on the stack as opposed to allocation via kzalloc(). | ||
| 219 | */ | ||
| 220 | |||
| 221 | /* | ||
| 222 | * Convert request response back to native format. Note that in the | ||
| 223 | * error case, this value is not touched by the SSAM core, i.e. | ||
| 224 | * 'ret_le' will be zero as specified in its initialization. | ||
| 225 | */ | ||
| 226 | *ret = le32_to_cpu(ret_le); | ||
| 227 | |||
| 228 | return status; | ||
| 229 | } | ||
| 230 | |||
| 231 | Note that |ssam_request_sync| in its essence is a wrapper over lower-level | ||
| 232 | request primitives, which may also be used to perform requests. Refer to its | ||
| 233 | implementation and documentation for more details. | ||
| 234 | |||
| 235 | An arguably more user-friendly way of defining such functions is by using | ||
| 236 | one of the generator macros, for example via: | ||
| 237 | |||
| 238 | .. code-block:: c | ||
| 239 | |||
| 240 | SSAM_DEFINE_SYNC_REQUEST_W(__ssam_tmp_perf_mode_set, __le32, { | ||
| 241 | .target_category = SSAM_SSH_TC_TMP, | ||
| 242 | .target_id = 0x01, | ||
| 243 | .command_id = 0x03, | ||
| 244 | .instance_id = 0x00, | ||
| 245 | }); | ||
| 246 | |||
| 247 | This example defines a function | ||
| 248 | |||
| 249 | .. code-block:: c | ||
| 250 | |||
| 251 | int __ssam_tmp_perf_mode_set(struct ssam_controller *ctrl, const __le32 *arg); | ||
| 252 | |||
| 253 | executing the specified request, with the controller passed in when calling | ||
| 254 | said function. In this example, the argument is provided via the ``arg`` | ||
| 255 | pointer. Note that the generated function allocates the message buffer on | ||
| 256 | the stack. Thus, if the argument provided via the request is large, these | ||
| 257 | kinds of macros should be avoided. Also note that, in contrast to the | ||
| 258 | previous non-macro example, this function does not do any endianness | ||
| 259 | conversion, which has to be handled by the caller. Apart from those | ||
| 260 | differences the function generated by the macro is similar to the one | ||
| 261 | provided in the non-macro example above. | ||
| 262 | |||
| 263 | The full list of such function-generating macros is | ||
| 264 | |||
| 265 | - :c:func:`SSAM_DEFINE_SYNC_REQUEST_N` for requests without return value and | ||
| 266 | without argument. | ||
| 267 | - :c:func:`SSAM_DEFINE_SYNC_REQUEST_R` for requests with return value but no | ||
| 268 | argument. | ||
| 269 | - :c:func:`SSAM_DEFINE_SYNC_REQUEST_W` for requests without return value but | ||
| 270 | with argument. | ||
| 271 | |||
| 272 | Refer to their respective documentation for more details. For each one of | ||
| 273 | these macros, a special variant is provided, which targets request types | ||
| 274 | applicable to multiple instances of the same device type: | ||
| 275 | |||
| 276 | - :c:func:`SSAM_DEFINE_SYNC_REQUEST_MD_N` | ||
| 277 | - :c:func:`SSAM_DEFINE_SYNC_REQUEST_MD_R` | ||
| 278 | - :c:func:`SSAM_DEFINE_SYNC_REQUEST_MD_W` | ||
| 279 | |||
| 280 | The difference of those macros to the previously mentioned versions is, that | ||
| 281 | the device target and instance IDs are not fixed for the generated function, | ||
| 282 | but instead have to be provided by the caller of said function. | ||
| 283 | |||
| 284 | Additionally, variants for direct use with client devices, i.e. | ||
| 285 | |ssam_device|, are also provided. These can, for example, be used as | ||
| 286 | follows: | ||
| 287 | |||
| 288 | .. code-block:: c | ||
| 289 | |||
| 290 | SSAM_DEFINE_SYNC_REQUEST_CL_R(ssam_bat_get_sta, __le32, { | ||
| 291 | .target_category = SSAM_SSH_TC_BAT, | ||
| 292 | .command_id = 0x01, | ||
| 293 | }); | ||
| 294 | |||
| 295 | This invocation of the macro defines a function | ||
| 296 | |||
| 297 | .. code-block:: c | ||
| 298 | |||
| 299 | int ssam_bat_get_sta(struct ssam_device *sdev, __le32 *ret); | ||
| 300 | |||
| 301 | executing the specified request, using the device IDs and controller given | ||
| 302 | in the client device. The full list of such macros for client devices is: | ||
| 303 | |||
| 304 | - :c:func:`SSAM_DEFINE_SYNC_REQUEST_CL_N` | ||
| 305 | - :c:func:`SSAM_DEFINE_SYNC_REQUEST_CL_R` | ||
| 306 | - :c:func:`SSAM_DEFINE_SYNC_REQUEST_CL_W` | ||
| 307 | |||
| 308 | |||
| 309 | Handling Events | ||
| 310 | =============== | ||
| 311 | |||
| 312 | To receive events from the SAM EC, an event notifier must be registered for | ||
| 313 | the desired event via |ssam_notifier_register|. The notifier must be | ||
| 314 | unregistered via |ssam_notifier_unregister| once it is not required any | ||
| 315 | more. | ||
| 316 | |||
| 317 | Event notifiers are registered by providing (at minimum) a callback to call | ||
| 318 | in case an event has been received, the registry specifying how the event | ||
| 319 | should be enabled, an event ID specifying for which target category and, | ||
| 320 | optionally and depending on the registry used, for which instance ID events | ||
| 321 | should be enabled, and finally, flags describing how the EC will send these | ||
| 322 | events. If the specific registry does not enable events by instance ID, the | ||
| 323 | instance ID must be set to zero. Additionally, a priority for the respective | ||
| 324 | notifier may be specified, which determines its order in relation to any | ||
| 325 | other notifier registered for the same target category. | ||
| 326 | |||
| 327 | By default, event notifiers will receive all events for the specific target | ||
| 328 | category, regardless of the instance ID specified when registering the | ||
| 329 | notifier. The core may be instructed to only call a notifier if the target | ||
| 330 | ID or instance ID (or both) of the event match the ones implied by the | ||
| 331 | notifier IDs (in case of target ID, the target ID of the registry), by | ||
| 332 | providing an event mask (see |ssam_event_mask|). | ||
| 333 | |||
| 334 | In general, the target ID of the registry is also the target ID of the | ||
| 335 | enabled event (with the notable exception being keyboard input events on the | ||
| 336 | Surface Laptop 1 and 2, which are enabled via a registry with target ID 1, | ||
| 337 | but provide events with target ID 2). | ||
| 338 | |||
| 339 | A full example for registering an event notifier and handling received | ||
| 340 | events is provided below: | ||
| 341 | |||
| 342 | .. code-block:: c | ||
| 343 | |||
| 344 | u32 notifier_callback(struct ssam_event_notifier *nf, | ||
| 345 | const struct ssam_event *event) | ||
| 346 | { | ||
| 347 | int status = ... | ||
| 348 | |||
| 349 | /* Handle the event here ... */ | ||
| 350 | |||
| 351 | /* Convert return value and indicate that we handled the event. */ | ||
| 352 | return ssam_notifier_from_errno(status) | SSAM_NOTIF_HANDLED; | ||
| 353 | } | ||
| 354 | |||
| 355 | int setup_notifier(struct ssam_device *sdev, | ||
| 356 | struct ssam_event_notifier *nf) | ||
| 357 | { | ||
| 358 | /* Set priority wrt. other handlers of same target category. */ | ||
| 359 | nf->base.priority = 1; | ||
| 360 | |||
| 361 | /* Set event/notifier callback. */ | ||
| 362 | nf->base.fn = notifier_callback; | ||
| 363 | |||
| 364 | /* Specify event registry, i.e. how events get enabled/disabled. */ | ||
| 365 | nf->event.reg = SSAM_EVENT_REGISTRY_KIP; | ||
| 366 | |||
| 367 | /* Specify which event to enable/disable */ | ||
| 368 | nf->event.id.target_category = sdev->uid.category; | ||
| 369 | nf->event.id.instance = sdev->uid.instance; | ||
| 370 | |||
| 371 | /* | ||
| 372 | * Specify for which events the notifier callback gets executed. | ||
| 373 | * This essentially tells the core if it can skip notifiers that | ||
| 374 | * don't have target or instance IDs matching those of the event. | ||
| 375 | */ | ||
| 376 | nf->event.mask = SSAM_EVENT_MASK_STRICT; | ||
| 377 | |||
| 378 | /* Specify event flags. */ | ||
| 379 | nf->event.flags = SSAM_EVENT_SEQUENCED; | ||
| 380 | |||
| 381 | return ssam_notifier_register(sdev->ctrl, nf); | ||
| 382 | } | ||
| 383 | |||
| 384 | Multiple event notifiers can be registered for the same event. The event | ||
| 385 | handler core takes care of enabling and disabling events when notifiers are | ||
| 386 | registered and unregistered, by keeping track of how many notifiers for a | ||
| 387 | specific event (combination of registry, event target category, and event | ||
| 388 | instance ID) are currently registered. This means that a specific event will | ||
| 389 | be enabled when the first notifier for it is being registered and disabled | ||
| 390 | when the last notifier for it is being unregistered. Note that the event | ||
| 391 | flags are therefore only used on the first registered notifier, however, one | ||
| 392 | should take care that notifiers for a specific event are always registered | ||
| 393 | with the same flag and it is considered a bug to do otherwise. | ||
| @@ -0,0 +1,87 @@ | |||
| 1 | .. SPDX-License-Identifier: GPL-2.0+ | ||
| 2 | |||
| 3 | .. |u8| replace:: :c:type:`u8 <u8>` | ||
| 4 | .. |u16| replace:: :c:type:`u16 <u16>` | ||
| 5 | .. |ssam_cdev_request| replace:: :c:type:`struct ssam_cdev_request <ssam_cdev_request>` | ||
| 6 | .. |ssam_cdev_request_flags| replace:: :c:type:`enum ssam_cdev_request_flags <ssam_cdev_request_flags>` | ||
| 7 | |||
| 8 | ============================== | ||
| 9 | User-Space EC Interface (cdev) | ||
| 10 | ============================== | ||
| 11 | |||
| 12 | The ``surface_aggregator_cdev`` module provides a misc-device for the SSAM | ||
| 13 | controller to allow for a (more or less) direct connection from user-space to | ||
| 14 | the SAM EC. It is intended to be used for development and debugging, and | ||
| 15 | therefore should not be used or relied upon in any other way. Note that this | ||
| 16 | module is not loaded automatically, but instead must be loaded manually. | ||
| 17 | |||
| 18 | The provided interface is accessible through the ``/dev/surface/aggregator`` | ||
| 19 | device-file. All functionality of this interface is provided via IOCTLs. | ||
| 20 | These IOCTLs and their respective input/output parameter structs are defined in | ||
| 21 | ``include/uapi/linux/surface_aggregator/cdev.h``. | ||
| 22 | |||
| 23 | A small python library and scripts for accessing this interface can be found | ||
| 24 | at https://github.com/linux-surface/surface-aggregator-module/tree/master/scripts/ssam. | ||
| 25 | |||
| 26 | |||
| 27 | Controller IOCTLs | ||
| 28 | ================= | ||
| 29 | |||
| 30 | The following IOCTLs are provided: | ||
| 31 | |||
| 32 | .. flat-table:: Controller IOCTLs | ||
| 33 | :widths: 1 1 1 1 4 | ||
| 34 | :header-rows: 1 | ||
| 35 | |||
| 36 | * - Type | ||
| 37 | - Number | ||
| 38 | - Direction | ||
| 39 | - Name | ||
| 40 | - Description | ||
| 41 | |||
| 42 | * - ``0xA5`` | ||
| 43 | - ``1`` | ||
| 44 | - ``WR`` | ||
| 45 | - ``REQUEST`` | ||
| 46 | - Perform synchronous SAM request. | ||
| 47 | |||
| 48 | |||
| 49 | ``REQUEST`` | ||
| 50 | ----------- | ||
| 51 | |||
| 52 | Defined as ``_IOWR(0xA5, 1, struct ssam_cdev_request)``. | ||
| 53 | |||
| 54 | Executes a synchronous SAM request. The request specification is passed in | ||
| 55 | as argument of type |ssam_cdev_request|, which is then written to/modified | ||
| 56 | by the IOCTL to return status and result of the request. | ||
| 57 | |||
| 58 | Request payload data must be allocated separately and is passed in via the | ||
| 59 | ``payload.data`` and ``payload.length`` members. If a response is required, | ||
| 60 | the response buffer must be allocated by the caller and passed in via the | ||
| 61 | ``response.data`` member. The ``response.length`` member must be set to the | ||
| 62 | capacity of this buffer, or if no response is required, zero. Upon | ||
| 63 | completion of the request, the call will write the response to the response | ||
| 64 | buffer (if its capacity allows it) and overwrite the length field with the | ||
| 65 | actual size of the response, in bytes. | ||
| 66 | |||
| 67 | Additionally, if the request has a response, this must be indicated via the | ||
| 68 | request flags, as is done with in-kernel requests. Request flags can be set | ||
| 69 | via the ``flags`` member and the values correspond to the values found in | ||
| 70 | |ssam_cdev_request_flags|. | ||
| 71 | |||
| 72 | Finally, the status of the request itself is returned in the ``status`` | ||
| 73 | member (a negative errno value indicating failure). Note that failure | ||
| 74 | indication of the IOCTL is separated from failure indication of the request: | ||
| 75 | The IOCTL returns a negative status code if anything failed during setup of | ||
| 76 | the request (``-EFAULT``) or if the provided argument or any of its fields | ||
| 77 | are invalid (``-EINVAL``). In this case, the status value of the request | ||
| 78 | argument may be set, providing more detail on what went wrong (e.g. | ||
| 79 | ``-ENOMEM`` for out-of-memory), but this value may also be zero. The IOCTL | ||
| 80 | will return with a zero status code in case the request has been set up, | ||
| 81 | submitted, and completed (i.e. handed back to user-space) successfully from | ||
| 82 | inside the IOCTL, but the request ``status`` member may still be negative in | ||
| 83 | case the actual execution of the request failed after it has been submitted. | ||
| 84 | |||
| 85 | A full definition of the argument struct is provided below: | ||
| 86 | |||
| 87 | .. kernel-doc:: include/uapi/linux/surface_aggregator/cdev.h | ||
| @@ -0,0 +1,21 @@ | |||
| 1 | .. SPDX-License-Identifier: GPL-2.0+ | ||
| 2 | |||
| 3 | =========================== | ||
| 4 | Client Driver Documentation | ||
| 5 | =========================== | ||
| 6 | |||
| 7 | This is the documentation for client drivers themselves. Refer to | ||
| 8 | :doc:`../client` for documentation on how to write client drivers. | ||
| 9 | |||
| 10 | .. toctree:: | ||
| 11 | :maxdepth: 1 | ||
| 12 | |||
| 13 | cdev | ||
| 14 | san | ||
| 15 | |||
| 16 | .. only:: subproject and html | ||
| 17 | |||
| 18 | Indices | ||
| 19 | ======= | ||
| 20 | |||
| 21 | * :ref:`genindex` | ||
| @@ -0,0 +1,44 @@ | |||
| 1 | .. SPDX-License-Identifier: GPL-2.0+ | ||
| 2 | |||
| 3 | .. |san_client_link| replace:: :c:func:`san_client_link` | ||
| 4 | .. |san_dgpu_notifier_register| replace:: :c:func:`san_dgpu_notifier_register` | ||
| 5 | .. |san_dgpu_notifier_unregister| replace:: :c:func:`san_dgpu_notifier_unregister` | ||
| 6 | |||
| 7 | =================== | ||
| 8 | Surface ACPI Notify | ||
| 9 | =================== | ||
| 10 | |||
| 11 | The Surface ACPI Notify (SAN) device provides the bridge between ACPI and | ||
| 12 | SAM controller. Specifically, ACPI code can execute requests and handle | ||
| 13 | battery and thermal events via this interface. In addition to this, events | ||
| 14 | relating to the discrete GPU (dGPU) of the Surface Book 2 can be sent from | ||
| 15 | ACPI code (note: the Surface Book 3 uses a different method for this). The | ||
| 16 | only currently known event sent via this interface is a dGPU power-on | ||
| 17 | notification. While this driver handles the former part internally, it only | ||
| 18 | relays the dGPU events to any other driver interested via its public API and | ||
| 19 | does not handle them. | ||
| 20 | |||
| 21 | The public interface of this driver is split into two parts: Client | ||
| 22 | registration and notifier-block registration. | ||
| 23 | |||
| 24 | A client to the SAN interface can be linked as consumer to the SAN device | ||
| 25 | via |san_client_link|. This can be used to ensure that the a client | ||
| 26 | receiving dGPU events does not miss any events due to the SAN interface not | ||
| 27 | being set up as this forces the client driver to unbind once the SAN driver | ||
| 28 | is unbound. | ||
| 29 | |||
| 30 | Notifier-blocks can be registered by any device for as long as the module is | ||
| 31 | loaded, regardless of being linked as client or not. Registration is done | ||
| 32 | with |san_dgpu_notifier_register|. If the notifier is not needed any more, it | ||
| 33 | should be unregistered via |san_dgpu_notifier_unregister|. | ||
| 34 | |||
| 35 | Consult the API documentation below for more details. | ||
| 36 | |||
| 37 | |||
| 38 | API Documentation | ||
| 39 | ================= | ||
| 40 | |||
| 41 | .. kernel-doc:: include/linux/surface_acpi_notify.h | ||
| 42 | |||
| 43 | .. kernel-doc:: drivers/platform/surface/surface_acpi_notify.c | ||
| 44 | :export: | ||
| @@ -0,0 +1,21 @@ | |||
| 1 | .. SPDX-License-Identifier: GPL-2.0+ | ||
| 2 | |||
| 3 | ======================================= | ||
| 4 | Surface System Aggregator Module (SSAM) | ||
| 5 | ======================================= | ||
| 6 | |||
| 7 | .. toctree:: | ||
| 8 | :maxdepth: 2 | ||
| 9 | |||
| 10 | overview | ||
| 11 | client | ||
| 12 | clients/index | ||
| 13 | ssh | ||
| 14 | internal | ||
| 15 | |||
| 16 | .. only:: subproject and html | ||
| 17 | |||
| 18 | Indices | ||
| 19 | ======= | ||
| 20 | |||
| 21 | * :ref:`genindex` | ||
| @@ -0,0 +1,67 @@ | |||
| 1 | .. SPDX-License-Identifier: GPL-2.0+ | ||
| 2 | |||
| 3 | ========================== | ||
| 4 | Internal API Documentation | ||
| 5 | ========================== | ||
| 6 | |||
| 7 | .. contents:: | ||
| 8 | :depth: 2 | ||
| 9 | |||
| 10 | |||
| 11 | Packet Transport Layer | ||
| 12 | ====================== | ||
| 13 | |||
| 14 | .. kernel-doc:: drivers/platform/surface/aggregator/ssh_parser.h | ||
| 15 | :internal: | ||
| 16 | |||
| 17 | .. kernel-doc:: drivers/platform/surface/aggregator/ssh_parser.c | ||
| 18 | :internal: | ||
| 19 | |||
| 20 | .. kernel-doc:: drivers/platform/surface/aggregator/ssh_msgb.h | ||
| 21 | :internal: | ||
| 22 | |||
| 23 | .. kernel-doc:: drivers/platform/surface/aggregator/ssh_packet_layer.h | ||
| 24 | :internal: | ||
| 25 | |||
| 26 | .. kernel-doc:: drivers/platform/surface/aggregator/ssh_packet_layer.c | ||
| 27 | :internal: | ||
| 28 | |||
| 29 | |||
| 30 | Request Transport Layer | ||
| 31 | ======================= | ||
| 32 | |||
| 33 | .. kernel-doc:: drivers/platform/surface/aggregator/ssh_request_layer.h | ||
| 34 | :internal: | ||
| 35 | |||
| 36 | .. kernel-doc:: drivers/platform/surface/aggregator/ssh_request_layer.c | ||
| 37 | :internal: | ||
| 38 | |||
| 39 | |||
| 40 | Controller | ||
| 41 | ========== | ||
| 42 | |||
| 43 | .. kernel-doc:: drivers/platform/surface/aggregator/controller.h | ||
| 44 | :internal: | ||
| 45 | |||
| 46 | .. kernel-doc:: drivers/platform/surface/aggregator/controller.c | ||
| 47 | :internal: | ||
| 48 | |||
| 49 | |||
| 50 | Client Device Bus | ||
| 51 | ================= | ||
| 52 | |||
| 53 | .. kernel-doc:: drivers/platform/surface/aggregator/bus.c | ||
| 54 | :internal: | ||
| 55 | |||
| 56 | |||
| 57 | Core | ||
| 58 | ==== | ||
| 59 | |||
| 60 | .. kernel-doc:: drivers/platform/surface/aggregator/core.c | ||
| 61 | :internal: | ||
| 62 | |||
| 63 | |||
| 64 | Trace Helpers | ||
| 65 | ============= | ||
| 66 | |||
| 67 | .. kernel-doc:: drivers/platform/surface/aggregator/trace.h | ||
| @@ -0,0 +1,577 @@ | |||
| 1 | .. SPDX-License-Identifier: GPL-2.0+ | ||
| 2 | |||
| 3 | .. |ssh_ptl| replace:: :c:type:`struct ssh_ptl <ssh_ptl>` | ||
| 4 | .. |ssh_ptl_submit| replace:: :c:func:`ssh_ptl_submit` | ||
| 5 | .. |ssh_ptl_cancel| replace:: :c:func:`ssh_ptl_cancel` | ||
| 6 | .. |ssh_ptl_shutdown| replace:: :c:func:`ssh_ptl_shutdown` | ||
| 7 | .. |ssh_ptl_rx_rcvbuf| replace:: :c:func:`ssh_ptl_rx_rcvbuf` | ||
| 8 | .. |ssh_rtl| replace:: :c:type:`struct ssh_rtl <ssh_rtl>` | ||
| 9 | .. |ssh_rtl_submit| replace:: :c:func:`ssh_rtl_submit` | ||
| 10 | .. |ssh_rtl_cancel| replace:: :c:func:`ssh_rtl_cancel` | ||
| 11 | .. |ssh_rtl_shutdown| replace:: :c:func:`ssh_rtl_shutdown` | ||
| 12 | .. |ssh_packet| replace:: :c:type:`struct ssh_packet <ssh_packet>` | ||
| 13 | .. |ssh_packet_get| replace:: :c:func:`ssh_packet_get` | ||
| 14 | .. |ssh_packet_put| replace:: :c:func:`ssh_packet_put` | ||
| 15 | .. |ssh_packet_ops| replace:: :c:type:`struct ssh_packet_ops <ssh_packet_ops>` | ||
| 16 | .. |ssh_packet_base_priority| replace:: :c:type:`enum ssh_packet_base_priority <ssh_packet_base_priority>` | ||
| 17 | .. |ssh_packet_flags| replace:: :c:type:`enum ssh_packet_flags <ssh_packet_flags>` | ||
| 18 | .. |SSH_PACKET_PRIORITY| replace:: :c:func:`SSH_PACKET_PRIORITY` | ||
| 19 | .. |ssh_frame| replace:: :c:type:`struct ssh_frame <ssh_frame>` | ||
| 20 | .. |ssh_command| replace:: :c:type:`struct ssh_command <ssh_command>` | ||
| 21 | .. |ssh_request| replace:: :c:type:`struct ssh_request <ssh_request>` | ||
| 22 | .. |ssh_request_get| replace:: :c:func:`ssh_request_get` | ||
| 23 | .. |ssh_request_put| replace:: :c:func:`ssh_request_put` | ||
| 24 | .. |ssh_request_ops| replace:: :c:type:`struct ssh_request_ops <ssh_request_ops>` | ||
| 25 | .. |ssh_request_init| replace:: :c:func:`ssh_request_init` | ||
| 26 | .. |ssh_request_flags| replace:: :c:type:`enum ssh_request_flags <ssh_request_flags>` | ||
| 27 | .. |ssam_controller| replace:: :c:type:`struct ssam_controller <ssam_controller>` | ||
| 28 | .. |ssam_device| replace:: :c:type:`struct ssam_device <ssam_device>` | ||
| 29 | .. |ssam_device_driver| replace:: :c:type:`struct ssam_device_driver <ssam_device_driver>` | ||
| 30 | .. |ssam_client_bind| replace:: :c:func:`ssam_client_bind` | ||
| 31 | .. |ssam_client_link| replace:: :c:func:`ssam_client_link` | ||
| 32 | .. |ssam_request_sync| replace:: :c:type:`struct ssam_request_sync <ssam_request_sync>` | ||
| 33 | .. |ssam_event_registry| replace:: :c:type:`struct ssam_event_registry <ssam_event_registry>` | ||
| 34 | .. |ssam_event_id| replace:: :c:type:`struct ssam_event_id <ssam_event_id>` | ||
| 35 | .. |ssam_nf| replace:: :c:type:`struct ssam_nf <ssam_nf>` | ||
| 36 | .. |ssam_nf_refcount_inc| replace:: :c:func:`ssam_nf_refcount_inc` | ||
| 37 | .. |ssam_nf_refcount_dec| replace:: :c:func:`ssam_nf_refcount_dec` | ||
| 38 | .. |ssam_notifier_register| replace:: :c:func:`ssam_notifier_register` | ||
| 39 | .. |ssam_notifier_unregister| replace:: :c:func:`ssam_notifier_unregister` | ||
| 40 | .. |ssam_cplt| replace:: :c:type:`struct ssam_cplt <ssam_cplt>` | ||
| 41 | .. |ssam_event_queue| replace:: :c:type:`struct ssam_event_queue <ssam_event_queue>` | ||
| 42 | .. |ssam_request_sync_submit| replace:: :c:func:`ssam_request_sync_submit` | ||
| 43 | |||
| 44 | ===================== | ||
| 45 | Core Driver Internals | ||
| 46 | ===================== | ||
| 47 | |||
| 48 | Architectural overview of the Surface System Aggregator Module (SSAM) core | ||
| 49 | and Surface Serial Hub (SSH) driver. For the API documentation, refer to: | ||
| 50 | |||
| 51 | .. toctree:: | ||
| 52 | :maxdepth: 2 | ||
| 53 | |||
| 54 | internal-api | ||
| 55 | |||
| 56 | |||
| 57 | Overview | ||
| 58 | ======== | ||
| 59 | |||
| 60 | The SSAM core implementation is structured in layers, somewhat following the | ||
| 61 | SSH protocol structure: | ||
| 62 | |||
| 63 | Lower-level packet transport is implemented in the *packet transport layer | ||
| 64 | (PTL)*, directly building on top of the serial device (serdev) | ||
| 65 | infrastructure of the kernel. As the name indicates, this layer deals with | ||
| 66 | the packet transport logic and handles things like packet validation, packet | ||
| 67 | acknowledgment (ACKing), packet (retransmission) timeouts, and relaying | ||
| 68 | packet payloads to higher-level layers. | ||
| 69 | |||
| 70 | Above this sits the *request transport layer (RTL)*. This layer is centered | ||
| 71 | around command-type packet payloads, i.e. requests (sent from host to EC), | ||
| 72 | responses of the EC to those requests, and events (sent from EC to host). | ||
| 73 | It, specifically, distinguishes events from request responses, matches | ||
| 74 | responses to their corresponding requests, and implements request timeouts. | ||
| 75 | |||
| 76 | The *controller* layer is building on top of this and essentially decides | ||
| 77 | how request responses and, especially, events are dealt with. It provides an | ||
| 78 | event notifier system, handles event activation/deactivation, provides a | ||
| 79 | workqueue for event and asynchronous request completion, and also manages | ||
| 80 | the message counters required for building command messages (``SEQ``, | ||
| 81 | ``RQID``). This layer basically provides a fundamental interface to the SAM | ||
| 82 | EC for use in other kernel drivers. | ||
| 83 | |||
| 84 | While the controller layer already provides an interface for other kernel | ||
| 85 | drivers, the client *bus* extends this interface to provide support for | ||
| 86 | native SSAM devices, i.e. devices that are not defined in ACPI and not | ||
| 87 | implemented as platform devices, via |ssam_device| and |ssam_device_driver| | ||
| 88 | simplify management of client devices and client drivers. | ||
| 89 | |||
| 90 | Refer to :doc:`client` for documentation regarding the client device/driver | ||
| 91 | API and interface options for other kernel drivers. It is recommended to | ||
| 92 | familiarize oneself with that chapter and the :doc:`ssh` before continuing | ||
| 93 | with the architectural overview below. | ||
| 94 | |||
| 95 | |||
| 96 | Packet Transport Layer | ||
| 97 | ====================== | ||
| 98 | |||
| 99 | The packet transport layer is represented via |ssh_ptl| and is structured | ||
| 100 | around the following key concepts: | ||
| 101 | |||
| 102 | Packets | ||
| 103 | ------- | ||
| 104 | |||
| 105 | Packets are the fundamental transmission unit of the SSH protocol. They are | ||
| 106 | managed by the packet transport layer, which is essentially the lowest layer | ||
| 107 | of the driver and is built upon by other components of the SSAM core. | ||
| 108 | Packets to be transmitted by the SSAM core are represented via |ssh_packet| | ||
| 109 | (in contrast, packets received by the core do not have any specific | ||
| 110 | structure and are managed entirely via the raw |ssh_frame|). | ||
| 111 | |||
| 112 | This structure contains the required fields to manage the packet inside the | ||
| 113 | transport layer, as well as a reference to the buffer containing the data to | ||
| 114 | be transmitted (i.e. the message wrapped in |ssh_frame|). Most notably, it | ||
| 115 | contains an internal reference count, which is used for managing its | ||
| 116 | lifetime (accessible via |ssh_packet_get| and |ssh_packet_put|). When this | ||
| 117 | counter reaches zero, the ``release()`` callback provided to the packet via | ||
| 118 | its |ssh_packet_ops| reference is executed, which may then deallocate the | ||
| 119 | packet or its enclosing structure (e.g. |ssh_request|). | ||
| 120 | |||
| 121 | In addition to the ``release`` callback, the |ssh_packet_ops| reference also | ||
| 122 | provides a ``complete()`` callback, which is run once the packet has been | ||
| 123 | completed and provides the status of this completion, i.e. zero on success | ||
| 124 | or a negative errno value in case of an error. Once the packet has been | ||
| 125 | submitted to the packet transport layer, the ``complete()`` callback is | ||
| 126 | always guaranteed to be executed before the ``release()`` callback, i.e. the | ||
| 127 | packet will always be completed, either successfully, with an error, or due | ||
| 128 | to cancellation, before it will be released. | ||
| 129 | |||
| 130 | The state of a packet is managed via its ``state`` flags | ||
| 131 | (|ssh_packet_flags|), which also contains the packet type. In particular, | ||
| 132 | the following bits are noteworthy: | ||
| 133 | |||
| 134 | * ``SSH_PACKET_SF_LOCKED_BIT``: This bit is set when completion, either | ||
| 135 | through error or success, is imminent. It indicates that no further | ||
| 136 | references of the packet should be taken and any existing references | ||
| 137 | should be dropped as soon as possible. The process setting this bit is | ||
| 138 | responsible for removing any references to this packet from the packet | ||
| 139 | queue and pending set. | ||
| 140 | |||
| 141 | * ``SSH_PACKET_SF_COMPLETED_BIT``: This bit is set by the process running the | ||
| 142 | ``complete()`` callback and is used to ensure that this callback only runs | ||
| 143 | once. | ||
| 144 | |||
| 145 | * ``SSH_PACKET_SF_QUEUED_BIT``: This bit is set when the packet is queued on | ||
| 146 | the packet queue and cleared when it is dequeued. | ||
| 147 | |||
| 148 | * ``SSH_PACKET_SF_PENDING_BIT``: This bit is set when the packet is added to | ||
| 149 | the pending set and cleared when it is removed from it. | ||
| 150 | |||
| 151 | Packet Queue | ||
| 152 | ------------ | ||
| 153 | |||
| 154 | The packet queue is the first of the two fundamental collections in the | ||
| 155 | packet transport layer. It is a priority queue, with priority of the | ||
| 156 | respective packets based on the packet type (major) and number of tries | ||
| 157 | (minor). See |SSH_PACKET_PRIORITY| for more details on the priority value. | ||
| 158 | |||
| 159 | All packets to be transmitted by the transport layer must be submitted to | ||
| 160 | this queue via |ssh_ptl_submit|. Note that this includes control packets | ||
| 161 | sent by the transport layer itself. Internally, data packets can be | ||
| 162 | re-submitted to this queue due to timeouts or NAK packets sent by the EC. | ||
| 163 | |||
| 164 | Pending Set | ||
| 165 | ----------- | ||
| 166 | |||
| 167 | The pending set is the second of the two fundamental collections in the | ||
| 168 | packet transport layer. It stores references to packets that have already | ||
| 169 | been transmitted, but wait for acknowledgment (e.g. the corresponding ACK | ||
| 170 | packet) by the EC. | ||
| 171 | |||
| 172 | Note that a packet may both be pending and queued if it has been | ||
| 173 | re-submitted due to a packet acknowledgment timeout or NAK. On such a | ||
| 174 | re-submission, packets are not removed from the pending set. | ||
| 175 | |||
| 176 | Transmitter Thread | ||
| 177 | ------------------ | ||
| 178 | |||
| 179 | The transmitter thread is responsible for most of the actual work regarding | ||
| 180 | packet transmission. In each iteration, it (waits for and) checks if the | ||
| 181 | next packet on the queue (if any) can be transmitted and, if so, removes it | ||
| 182 | from the queue and increments its counter for the number of transmission | ||
| 183 | attempts, i.e. tries. If the packet is sequenced, i.e. requires an ACK by | ||
| 184 | the EC, the packet is added to the pending set. Next, the packet's data is | ||
| 185 | submitted to the serdev subsystem. In case of an error or timeout during | ||
| 186 | this submission, the packet is completed by the transmitter thread with the | ||
| 187 | status value of the callback set accordingly. In case the packet is | ||
| 188 | unsequenced, i.e. does not require an ACK by the EC, the packet is completed | ||
| 189 | with success on the transmitter thread. | ||
| 190 | |||
| 191 | Transmission of sequenced packets is limited by the number of concurrently | ||
| 192 | pending packets, i.e. a limit on how many packets may be waiting for an ACK | ||
| 193 | from the EC in parallel. This limit is currently set to one (see :doc:`ssh` | ||
| 194 | for the reasoning behind this). Control packets (i.e. ACK and NAK) can | ||
| 195 | always be transmitted. | ||
| 196 | |||
| 197 | Receiver Thread | ||
| 198 | --------------- | ||
| 199 | |||
| 200 | Any data received from the EC is put into a FIFO buffer for further | ||
| 201 | processing. This processing happens on the receiver thread. The receiver | ||
| 202 | thread parses and validates the received message into its |ssh_frame| and | ||
| 203 | corresponding payload. It prepares and submits the necessary ACK (and on | ||
| 204 | validation error or invalid data NAK) packets for the received messages. | ||
| 205 | |||
| 206 | This thread also handles further processing, such as matching ACK messages | ||
| 207 | to the corresponding pending packet (via sequence ID) and completing it, as | ||
| 208 | well as initiating re-submission of all currently pending packets on | ||
| 209 | receival of a NAK message (re-submission in case of a NAK is similar to | ||
| 210 | re-submission due to timeout, see below for more details on that). Note that | ||
| 211 | the successful completion of a sequenced packet will always run on the | ||
| 212 | receiver thread (whereas any failure-indicating completion will run on the | ||
| 213 | process where the failure occurred). | ||
| 214 | |||
| 215 | Any payload data is forwarded via a callback to the next upper layer, i.e. | ||
| 216 | the request transport layer. | ||
| 217 | |||
| 218 | Timeout Reaper | ||
| 219 | -------------- | ||
| 220 | |||
| 221 | The packet acknowledgment timeout is a per-packet timeout for sequenced | ||
| 222 | packets, started when the respective packet begins (re-)transmission (i.e. | ||
| 223 | this timeout is armed once per transmission attempt on the transmitter | ||
| 224 | thread). It is used to trigger re-submission or, when the number of tries | ||
| 225 | has been exceeded, cancellation of the packet in question. | ||
| 226 | |||
| 227 | This timeout is handled via a dedicated reaper task, which is essentially a | ||
| 228 | work item (re-)scheduled to run when the next packet is set to time out. The | ||
| 229 | work item then checks the set of pending packets for any packets that have | ||
| 230 | exceeded the timeout and, if there are any remaining packets, re-schedules | ||
| 231 | itself to the next appropriate point in time. | ||
| 232 | |||
| 233 | If a timeout has been detected by the reaper, the packet will either be | ||
| 234 | re-submitted if it still has some remaining tries left, or completed with | ||
| 235 | ``-ETIMEDOUT`` as status if not. Note that re-submission, in this case and | ||
| 236 | triggered by receival of a NAK, means that the packet is added to the queue | ||
| 237 | with a now incremented number of tries, yielding a higher priority. The | ||
| 238 | timeout for the packet will be disabled until the next transmission attempt | ||
| 239 | and the packet remains on the pending set. | ||
| 240 | |||
| 241 | Note that due to transmission and packet acknowledgment timeouts, the packet | ||
| 242 | transport layer is always guaranteed to make progress, if only through | ||
| 243 | timing out packets, and will never fully block. | ||
| 244 | |||
| 245 | Concurrency and Locking | ||
| 246 | ----------------------- | ||
| 247 | |||
| 248 | There are two main locks in the packet transport layer: One guarding access | ||
| 249 | to the packet queue and one guarding access to the pending set. These | ||
| 250 | collections may only be accessed and modified under the respective lock. If | ||
| 251 | access to both collections is needed, the pending lock must be acquired | ||
| 252 | before the queue lock to avoid deadlocks. | ||
| 253 | |||
| 254 | In addition to guarding the collections, after initial packet submission | ||
| 255 | certain packet fields may only be accessed under one of the locks. | ||
| 256 | Specifically, the packet priority must only be accessed while holding the | ||
| 257 | queue lock and the packet timestamp must only be accessed while holding the | ||
| 258 | pending lock. | ||
| 259 | |||
| 260 | Other parts of the packet transport layer are guarded independently. State | ||
| 261 | flags are managed by atomic bit operations and, if necessary, memory | ||
| 262 | barriers. Modifications to the timeout reaper work item and expiration date | ||
| 263 | are guarded by their own lock. | ||
| 264 | |||
| 265 | The reference of the packet to the packet transport layer (``ptl``) is | ||
| 266 | somewhat special. It is either set when the upper layer request is submitted | ||
| 267 | or, if there is none, when the packet is first submitted. After it is set, | ||
| 268 | it will not change its value. Functions that may run concurrently with | ||
| 269 | submission, i.e. cancellation, can not rely on the ``ptl`` reference to be | ||
| 270 | set. Access to it in these functions is guarded by ``READ_ONCE()``, whereas | ||
| 271 | setting ``ptl`` is equally guarded with ``WRITE_ONCE()`` for symmetry. | ||
| 272 | |||
| 273 | Some packet fields may be read outside of the respective locks guarding | ||
| 274 | them, specifically priority and state for tracing. In those cases, proper | ||
| 275 | access is ensured by employing ``WRITE_ONCE()`` and ``READ_ONCE()``. Such | ||
| 276 | read-only access is only allowed when stale values are not critical. | ||
| 277 | |||
| 278 | With respect to the interface for higher layers, packet submission | ||
| 279 | (|ssh_ptl_submit|), packet cancellation (|ssh_ptl_cancel|), data receival | ||
| 280 | (|ssh_ptl_rx_rcvbuf|), and layer shutdown (|ssh_ptl_shutdown|) may always be | ||
| 281 | executed concurrently with respect to each other. Note that packet | ||
| 282 | submission may not run concurrently with itself for the same packet. | ||
| 283 | Equally, shutdown and data receival may also not run concurrently with | ||
| 284 | themselves (but may run concurrently with each other). | ||
| 285 | |||
| 286 | |||
| 287 | Request Transport Layer | ||
| 288 | ======================= | ||
| 289 | |||
| 290 | The request transport layer is represented via |ssh_rtl| and builds on top | ||
| 291 | of the packet transport layer. It deals with requests, i.e. SSH packets sent | ||
| 292 | by the host containing a |ssh_command| as frame payload. This layer | ||
| 293 | separates responses to requests from events, which are also sent by the EC | ||
| 294 | via a |ssh_command| payload. While responses are handled in this layer, | ||
| 295 | events are relayed to the next upper layer, i.e. the controller layer, via | ||
| 296 | the corresponding callback. The request transport layer is structured around | ||
| 297 | the following key concepts: | ||
| 298 | |||
| 299 | Request | ||
| 300 | ------- | ||
| 301 | |||
| 302 | Requests are packets with a command-type payload, sent from host to EC to | ||
| 303 | query data from or trigger an action on it (or both simultaneously). They | ||
| 304 | are represented by |ssh_request|, wrapping the underlying |ssh_packet| | ||
| 305 | storing its message data (i.e. SSH frame with command payload). Note that | ||
| 306 | all top-level representations, e.g. |ssam_request_sync| are built upon this | ||
| 307 | struct. | ||
| 308 | |||
| 309 | As |ssh_request| extends |ssh_packet|, its lifetime is also managed by the | ||
| 310 | reference counter inside the packet struct (which can be accessed via | ||
| 311 | |ssh_request_get| and |ssh_request_put|). Once the counter reaches zero, the | ||
| 312 | ``release()`` callback of the |ssh_request_ops| reference of the request is | ||
| 313 | called. | ||
| 314 | |||
| 315 | Requests can have an optional response that is equally sent via a SSH | ||
| 316 | message with command-type payload (from EC to host). The party constructing | ||
| 317 | the request must know if a response is expected and mark this in the request | ||
| 318 | flags provided to |ssh_request_init|, so that the request transport layer | ||
| 319 | can wait for this response. | ||
| 320 | |||
| 321 | Similar to |ssh_packet|, |ssh_request| also has a ``complete()`` callback | ||
| 322 | provided via its request ops reference and is guaranteed to be completed | ||
| 323 | before it is released once it has been submitted to the request transport | ||
| 324 | layer via |ssh_rtl_submit|. For a request without a response, successful | ||
| 325 | completion will occur once the underlying packet has been successfully | ||
| 326 | transmitted by the packet transport layer (i.e. from within the packet | ||
| 327 | completion callback). For a request with response, successful completion | ||
| 328 | will occur once the response has been received and matched to the request | ||
| 329 | via its request ID (which happens on the packet layer's data-received | ||
| 330 | callback running on the receiver thread). If the request is completed with | ||
| 331 | an error, the status value will be set to the corresponding (negative) errno | ||
| 332 | value. | ||
| 333 | |||
| 334 | The state of a request is again managed via its ``state`` flags | ||
| 335 | (|ssh_request_flags|), which also encode the request type. In particular, | ||
| 336 | the following bits are noteworthy: | ||
| 337 | |||
| 338 | * ``SSH_REQUEST_SF_LOCKED_BIT``: This bit is set when completion, either | ||
| 339 | through error or success, is imminent. It indicates that no further | ||
| 340 | references of the request should be taken and any existing references | ||
| 341 | should be dropped as soon as possible. The process setting this bit is | ||
| 342 | responsible for removing any references to this request from the request | ||
| 343 | queue and pending set. | ||
| 344 | |||
| 345 | * ``SSH_REQUEST_SF_COMPLETED_BIT``: This bit is set by the process running the | ||
| 346 | ``complete()`` callback and is used to ensure that this callback only runs | ||
| 347 | once. | ||
| 348 | |||
| 349 | * ``SSH_REQUEST_SF_QUEUED_BIT``: This bit is set when the request is queued on | ||
| 350 | the request queue and cleared when it is dequeued. | ||
| 351 | |||
| 352 | * ``SSH_REQUEST_SF_PENDING_BIT``: This bit is set when the request is added to | ||
| 353 | the pending set and cleared when it is removed from it. | ||
| 354 | |||
| 355 | Request Queue | ||
| 356 | ------------- | ||
| 357 | |||
| 358 | The request queue is the first of the two fundamental collections in the | ||
| 359 | request transport layer. In contrast to the packet queue of the packet | ||
| 360 | transport layer, it is not a priority queue and the simple first come first | ||
| 361 | serve principle applies. | ||
| 362 | |||
| 363 | All requests to be transmitted by the request transport layer must be | ||
| 364 | submitted to this queue via |ssh_rtl_submit|. Once submitted, requests may | ||
| 365 | not be re-submitted, and will not be re-submitted automatically on timeout. | ||
| 366 | Instead, the request is completed with a timeout error. If desired, the | ||
| 367 | caller can create and submit a new request for another try, but it must not | ||
| 368 | submit the same request again. | ||
| 369 | |||
| 370 | Pending Set | ||
| 371 | ----------- | ||
| 372 | |||
| 373 | The pending set is the second of the two fundamental collections in the | ||
| 374 | request transport layer. This collection stores references to all pending | ||
| 375 | requests, i.e. requests awaiting a response from the EC (similar to what the | ||
| 376 | pending set of the packet transport layer does for packets). | ||
| 377 | |||
| 378 | Transmitter Task | ||
| 379 | ---------------- | ||
| 380 | |||
| 381 | The transmitter task is scheduled when a new request is available for | ||
| 382 | transmission. It checks if the next request on the request queue can be | ||
| 383 | transmitted and, if so, submits its underlying packet to the packet | ||
| 384 | transport layer. This check ensures that only a limited number of | ||
| 385 | requests can be pending, i.e. waiting for a response, at the same time. If | ||
| 386 | the request requires a response, the request is added to the pending set | ||
| 387 | before its packet is submitted. | ||
| 388 | |||
| 389 | Packet Completion Callback | ||
| 390 | -------------------------- | ||
| 391 | |||
| 392 | The packet completion callback is executed once the underlying packet of a | ||
| 393 | request has been completed. In case of an error completion, the | ||
| 394 | corresponding request is completed with the error value provided in this | ||
| 395 | callback. | ||
| 396 | |||
| 397 | On successful packet completion, further processing depends on the request. | ||
| 398 | If the request expects a response, it is marked as transmitted and the | ||
| 399 | request timeout is started. If the request does not expect a response, it is | ||
| 400 | completed with success. | ||
| 401 | |||
| 402 | Data-Received Callback | ||
| 403 | ---------------------- | ||
| 404 | |||
| 405 | The data received callback notifies the request transport layer of data | ||
| 406 | being received by the underlying packet transport layer via a data-type | ||
| 407 | frame. In general, this is expected to be a command-type payload. | ||
| 408 | |||
| 409 | If the request ID of the command is one of the request IDs reserved for | ||
| 410 | events (one to ``SSH_NUM_EVENTS``, inclusively), it is forwarded to the | ||
| 411 | event callback registered in the request transport layer. If the request ID | ||
| 412 | indicates a response to a request, the respective request is looked up in | ||
| 413 | the pending set and, if found and marked as transmitted, completed with | ||
| 414 | success. | ||
| 415 | |||
| 416 | Timeout Reaper | ||
| 417 | -------------- | ||
| 418 | |||
| 419 | The request-response-timeout is a per-request timeout for requests expecting | ||
| 420 | a response. It is used to ensure that a request does not wait indefinitely | ||
| 421 | on a response from the EC and is started after the underlying packet has | ||
| 422 | been successfully completed. | ||
| 423 | |||
| 424 | This timeout is, similar to the packet acknowledgment timeout on the packet | ||
| 425 | transport layer, handled via a dedicated reaper task. This task is | ||
| 426 | essentially a work-item (re-)scheduled to run when the next request is set | ||
| 427 | to time out. The work item then scans the set of pending requests for any | ||
| 428 | requests that have timed out and completes them with ``-ETIMEDOUT`` as | ||
| 429 | status. Requests will not be re-submitted automatically. Instead, the issuer | ||
| 430 | of the request must construct and submit a new request, if so desired. | ||
| 431 | |||
| 432 | Note that this timeout, in combination with packet transmission and | ||
| 433 | acknowledgment timeouts, guarantees that the request layer will always make | ||
| 434 | progress, even if only through timing out packets, and never fully block. | ||
| 435 | |||
| 436 | Concurrency and Locking | ||
| 437 | ----------------------- | ||
| 438 | |||
| 439 | Similar to the packet transport layer, there are two main locks in the | ||
| 440 | request transport layer: One guarding access to the request queue and one | ||
| 441 | guarding access to the pending set. These collections may only be accessed | ||
| 442 | and modified under the respective lock. | ||
| 443 | |||
| 444 | Other parts of the request transport layer are guarded independently. State | ||
| 445 | flags are (again) managed by atomic bit operations and, if necessary, memory | ||
| 446 | barriers. Modifications to the timeout reaper work item and expiration date | ||
| 447 | are guarded by their own lock. | ||
| 448 | |||
| 449 | Some request fields may be read outside of the respective locks guarding | ||
| 450 | them, specifically the state for tracing. In those cases, proper access is | ||
| 451 | ensured by employing ``WRITE_ONCE()`` and ``READ_ONCE()``. Such read-only | ||
| 452 | access is only allowed when stale values are not critical. | ||
| 453 | |||
| 454 | With respect to the interface for higher layers, request submission | ||
| 455 | (|ssh_rtl_submit|), request cancellation (|ssh_rtl_cancel|), and layer | ||
| 456 | shutdown (|ssh_rtl_shutdown|) may always be executed concurrently with | ||
| 457 | respect to each other. Note that request submission may not run concurrently | ||
| 458 | with itself for the same request (and also may only be called once per | ||
| 459 | request). Equally, shutdown may also not run concurrently with itself. | ||
| 460 | |||
| 461 | |||
| 462 | Controller Layer | ||
| 463 | ================ | ||
| 464 | |||
| 465 | The controller layer extends on the request transport layer to provide an | ||
| 466 | easy-to-use interface for client drivers. It is represented by | ||
| 467 | |ssam_controller| and the SSH driver. While the lower level transport layers | ||
| 468 | take care of transmitting and handling packets and requests, the controller | ||
| 469 | layer takes on more of a management role. Specifically, it handles device | ||
| 470 | initialization, power management, and event handling, including event | ||
| 471 | delivery and registration via the (event) completion system (|ssam_cplt|). | ||
| 472 | |||
| 473 | Event Registration | ||
| 474 | ------------------ | ||
| 475 | |||
| 476 | In general, an event (or rather a class of events) has to be explicitly | ||
| 477 | requested by the host before the EC will send it (HID input events seem to | ||
| 478 | be the exception). This is done via an event-enable request (similarly, | ||
| 479 | events should be disabled via an event-disable request once no longer | ||
| 480 | desired). | ||
| 481 | |||
| 482 | The specific request used to enable (or disable) an event is given via an | ||
| 483 | event registry, i.e. the governing authority of this event (so to speak), | ||
| 484 | represented by |ssam_event_registry|. As parameters to this request, the | ||
| 485 | target category and, depending on the event registry, instance ID of the | ||
| 486 | event to be enabled must be provided. This (optional) instance ID must be | ||
| 487 | zero if the registry does not use it. Together, target category and instance | ||
| 488 | ID form the event ID, represented by |ssam_event_id|. In short, both, event | ||
| 489 | registry and event ID, are required to uniquely identify a respective class | ||
| 490 | of events. | ||
| 491 | |||
| 492 | Note that a further *request ID* parameter must be provided for the | ||
| 493 | enable-event request. This parameter does not influence the class of events | ||
| 494 | being enabled, but instead is set as the request ID (RQID) on each event of | ||
| 495 | this class sent by the EC. It is used to identify events (as a limited | ||
| 496 | number of request IDs is reserved for use in events only, specifically one | ||
| 497 | to ``SSH_NUM_EVENTS`` inclusively) and also map events to their specific | ||
| 498 | class. Currently, the controller always sets this parameter to the target | ||
| 499 | category specified in |ssam_event_id|. | ||
| 500 | |||
| 501 | As multiple client drivers may rely on the same (or overlapping) classes of | ||
| 502 | events and enable/disable calls are strictly binary (i.e. on/off), the | ||
| 503 | controller has to manage access to these events. It does so via reference | ||
| 504 | counting, storing the counter inside an RB-tree based mapping with event | ||
| 505 | registry and ID as key (there is no known list of valid event registry and | ||
| 506 | event ID combinations). See |ssam_nf|, |ssam_nf_refcount_inc|, and | ||
| 507 | |ssam_nf_refcount_dec| for details. | ||
| 508 | |||
| 509 | This management is done together with notifier registration (described in | ||
| 510 | the next section) via the top-level |ssam_notifier_register| and | ||
| 511 | |ssam_notifier_unregister| functions. | ||
| 512 | |||
| 513 | Event Delivery | ||
| 514 | -------------- | ||
| 515 | |||
| 516 | To receive events, a client driver has to register an event notifier via | ||
| 517 | |ssam_notifier_register|. This increments the reference counter for that | ||
| 518 | specific class of events (as detailed in the previous section), enables the | ||
| 519 | class on the EC (if it has not been enabled already), and installs the | ||
| 520 | provided notifier callback. | ||
| 521 | |||
| 522 | Notifier callbacks are stored in lists, with one (RCU) list per target | ||
| 523 | category (provided via the event ID; NB: there is a fixed known number of | ||
| 524 | target categories). There is no known association from the combination of | ||
| 525 | event registry and event ID to the command data (target ID, target category, | ||
| 526 | command ID, and instance ID) that can be provided by an event class, apart | ||
| 527 | from target category and instance ID given via the event ID. | ||
| 528 | |||
| 529 | Note that due to the way notifiers are (or rather have to be) stored, client | ||
| 530 | drivers may receive events that they have not requested and need to account | ||
| 531 | for them. Specifically, they will, by default, receive all events from the | ||
| 532 | same target category. To simplify dealing with this, filtering of events by | ||
| 533 | target ID (provided via the event registry) and instance ID (provided via | ||
| 534 | the event ID) can be requested when registering a notifier. This filtering | ||
| 535 | is applied when iterating over the notifiers at the time they are executed. | ||
| 536 | |||
| 537 | All notifier callbacks are executed on a dedicated workqueue, the so-called | ||
| 538 | completion workqueue. After an event has been received via the callback | ||
| 539 | installed in the request layer (running on the receiver thread of the packet | ||
| 540 | transport layer), it will be put on its respective event queue | ||
| 541 | (|ssam_event_queue|). From this event queue the completion work item of that | ||
| 542 | queue (running on the completion workqueue) will pick up the event and | ||
| 543 | execute the notifier callback. This is done to avoid blocking on the | ||
| 544 | receiver thread. | ||
| 545 | |||
| 546 | There is one event queue per combination of target ID and target category. | ||
| 547 | This is done to ensure that notifier callbacks are executed in sequence for | ||
| 548 | events of the same target ID and target category. Callbacks can be executed | ||
| 549 | in parallel for events with a different combination of target ID and target | ||
| 550 | category. | ||
| 551 | |||
| 552 | Concurrency and Locking | ||
| 553 | ----------------------- | ||
| 554 | |||
| 555 | Most of the concurrency related safety guarantees of the controller are | ||
| 556 | provided by the lower-level request transport layer. In addition to this, | ||
| 557 | event (un-)registration is guarded by its own lock. | ||
| 558 | |||
| 559 | Access to the controller state is guarded by the state lock. This lock is a | ||
| 560 | read/write semaphore. The reader part can be used to ensure that the state | ||
| 561 | does not change while functions depending on the state to stay the same | ||
| 562 | (e.g. |ssam_notifier_register|, |ssam_notifier_unregister|, | ||
| 563 | |ssam_request_sync_submit|, and derivatives) are executed and this guarantee | ||
| 564 | is not already provided otherwise (e.g. through |ssam_client_bind| or | ||
| 565 | |ssam_client_link|). The writer part guards any transitions that will change | ||
| 566 | the state, i.e. initialization, destruction, suspension, and resumption. | ||
| 567 | |||
| 568 | The controller state may be accessed (read-only) outside the state lock for | ||
| 569 | smoke-testing against invalid API usage (e.g. in |ssam_request_sync_submit|). | ||
| 570 | Note that such checks are not supposed to (and will not) protect against all | ||
| 571 | invalid usages, but rather aim to help catch them. In those cases, proper | ||
| 572 | variable access is ensured by employing ``WRITE_ONCE()`` and ``READ_ONCE()``. | ||
| 573 | |||
| 574 | Assuming any preconditions on the state not changing have been satisfied, | ||
| 575 | all non-initialization and non-shutdown functions may run concurrently with | ||
| 576 | each other. This includes |ssam_notifier_register|, |ssam_notifier_unregister|, | ||
| 577 | |ssam_request_sync_submit|, as well as all functions building on top of those. | ||
| @@ -0,0 +1,77 @@ | |||
| 1 | .. SPDX-License-Identifier: GPL-2.0+ | ||
| 2 | |||
| 3 | ======== | ||
| 4 | Overview | ||
| 5 | ======== | ||
| 6 | |||
| 7 | The Surface/System Aggregator Module (SAM, SSAM) is an (arguably *the*) | ||
| 8 | embedded controller (EC) on Microsoft Surface devices. It has been originally | ||
| 9 | introduced on 4th generation devices (Surface Pro 4, Surface Book 1), but | ||
| 10 | its responsibilities and feature-set have since been expanded significantly | ||
| 11 | with the following generations. | ||
| 12 | |||
| 13 | |||
| 14 | Features and Integration | ||
| 15 | ======================== | ||
| 16 | |||
| 17 | Not much is currently known about SAM on 4th generation devices (Surface Pro | ||
| 18 | 4, Surface Book 1), due to the use of a different communication interface | ||
| 19 | between host and EC (as detailed below). On 5th (Surface Pro 2017, Surface | ||
| 20 | Book 2, Surface Laptop 1) and later generation devices, SAM is responsible | ||
| 21 | for providing battery information (both current status and static values, | ||
| 22 | such as maximum capacity etc.), as well as an assortment of temperature | ||
| 23 | sensors (e.g. skin temperature) and cooling/performance-mode setting to the | ||
| 24 | host. On the Surface Book 2, specifically, it additionally provides an | ||
| 25 | interface for properly handling clipboard detachment (i.e. separating the | ||
| 26 | display part from the keyboard part of the device), on the Surface Laptop 1 | ||
| 27 | and 2 it is required for keyboard HID input. This HID subsystem has been | ||
| 28 | restructured for 7th generation devices and on those, specifically Surface | ||
| 29 | Laptop 3 and Surface Book 3, is responsible for all major HID input (i.e. | ||
| 30 | keyboard and touchpad). | ||
| 31 | |||
| 32 | While features have not changed much on a coarse level since the 5th | ||
| 33 | generation, internal interfaces have undergone some rather large changes. On | ||
| 34 | 5th and 6th generation devices, both battery and temperature information is | ||
| 35 | exposed to ACPI via a shim driver (referred to as Surface ACPI Notify, or | ||
| 36 | SAN), translating ACPI generic serial bus write-/read-accesses to SAM | ||
| 37 | requests. On 7th generation devices, this additional layer is gone and these | ||
| 38 | devices require a driver hooking directly into the SAM interface. Equally, | ||
| 39 | on newer generations, less devices are declared in ACPI, making them a bit | ||
| 40 | harder to discover and requiring us to hard-code a sort of device registry. | ||
| 41 | Due to this, a SSAM bus and subsystem with client devices | ||
| 42 | (:c:type:`struct ssam_device <ssam_device>`) has been implemented. | ||
| 43 | |||
| 44 | |||
| 45 | Communication | ||
| 46 | ============= | ||
| 47 | |||
| 48 | The type of communication interface between host and EC depends on the | ||
| 49 | generation of the Surface device. On 4th generation devices, host and EC | ||
| 50 | communicate via HID, specifically using a HID-over-I2C device, whereas on | ||
| 51 | 5th and later generations, communication takes place via a USART serial | ||
| 52 | device. In accordance to the drivers found on other operating systems, we | ||
| 53 | refer to the serial device and its driver as Surface Serial Hub (SSH). When | ||
| 54 | needed, we differentiate between both types of SAM by referring to them as | ||
| 55 | SAM-over-SSH and SAM-over-HID. | ||
| 56 | |||
| 57 | Currently, this subsystem only supports SAM-over-SSH. The SSH communication | ||
| 58 | interface is described in more detail below. The HID interface has not been | ||
| 59 | reverse engineered yet and it is, at the moment, unclear how many (and | ||
| 60 | which) concepts of the SSH interface detailed below can be transferred to | ||
| 61 | it. | ||
| 62 | |||
| 63 | Surface Serial Hub | ||
| 64 | ------------------ | ||
| 65 | |||
| 66 | As already elaborated above, the Surface Serial Hub (SSH) is the | ||
| 67 | communication interface for SAM on 5th- and all later-generation Surface | ||
| 68 | devices. On the highest level, communication can be separated into two main | ||
| 69 | types: Requests, messages sent from host to EC that may trigger a direct | ||
| 70 | response from the EC (explicitly associated with the request), and events | ||
| 71 | (sometimes also referred to as notifications), sent from EC to host without | ||
| 72 | being a direct response to a previous request. We may also refer to requests | ||
| 73 | without response as commands. In general, events need to be enabled via one | ||
| 74 | of multiple dedicated requests before they are sent by the EC. | ||
| 75 | |||
| 76 | See :doc:`ssh` for a more technical protocol documentation and | ||
| 77 | :doc:`internal` for an overview of the internal driver architecture. | ||
| @@ -0,0 +1,344 @@ | |||
| 1 | .. SPDX-License-Identifier: GPL-2.0+ | ||
| 2 | |||
| 3 | .. |u8| replace:: :c:type:`u8 <u8>` | ||
| 4 | .. |u16| replace:: :c:type:`u16 <u16>` | ||
| 5 | .. |TYPE| replace:: ``TYPE`` | ||
| 6 | .. |LEN| replace:: ``LEN`` | ||
| 7 | .. |SEQ| replace:: ``SEQ`` | ||
| 8 | .. |SYN| replace:: ``SYN`` | ||
| 9 | .. |NAK| replace:: ``NAK`` | ||
| 10 | .. |ACK| replace:: ``ACK`` | ||
| 11 | .. |DATA| replace:: ``DATA`` | ||
| 12 | .. |DATA_SEQ| replace:: ``DATA_SEQ`` | ||
| 13 | .. |DATA_NSQ| replace:: ``DATA_NSQ`` | ||
| 14 | .. |TC| replace:: ``TC`` | ||
| 15 | .. |TID| replace:: ``TID`` | ||
| 16 | .. |IID| replace:: ``IID`` | ||
| 17 | .. |RQID| replace:: ``RQID`` | ||
| 18 | .. |CID| replace:: ``CID`` | ||
| 19 | |||
| 20 | =========================== | ||
| 21 | Surface Serial Hub Protocol | ||
| 22 | =========================== | ||
| 23 | |||
| 24 | The Surface Serial Hub (SSH) is the central communication interface for the | ||
| 25 | embedded Surface Aggregator Module controller (SAM or EC), found on newer | ||
| 26 | Surface generations. We will refer to this protocol and interface as | ||
| 27 | SAM-over-SSH, as opposed to SAM-over-HID for the older generations. | ||
| 28 | |||
| 29 | On Surface devices with SAM-over-SSH, SAM is connected to the host via UART | ||
| 30 | and defined in ACPI as device with ID ``MSHW0084``. On these devices, | ||
| 31 | significant functionality is provided via SAM, including access to battery | ||
| 32 | and power information and events, thermal read-outs and events, and many | ||
| 33 | more. For Surface Laptops, keyboard input is handled via HID directed | ||
| 34 | through SAM, on the Surface Laptop 3 and Surface Book 3 this also includes | ||
| 35 | touchpad input. | ||
| 36 | |||
| 37 | Note that the standard disclaimer for this subsystem also applies to this | ||
| 38 | document: All of this has been reverse-engineered and may thus be erroneous | ||
| 39 | and/or incomplete. | ||
| 40 | |||
| 41 | All CRCs used in the following are two-byte ``crc_ccitt_false(0xffff, ...)``. | ||
| 42 | All multi-byte values are little-endian, there is no implicit padding between | ||
| 43 | values. | ||
| 44 | |||
| 45 | |||
| 46 | SSH Packet Protocol: Definitions | ||
| 47 | ================================ | ||
| 48 | |||
| 49 | The fundamental communication unit of the SSH protocol is a frame | ||
| 50 | (:c:type:`struct ssh_frame <ssh_frame>`). A frame consists of the following | ||
| 51 | fields, packed together and in order: | ||
| 52 | |||
| 53 | .. flat-table:: SSH Frame | ||
| 54 | :widths: 1 1 4 | ||
| 55 | :header-rows: 1 | ||
| 56 | |||
| 57 | * - Field | ||
| 58 | - Type | ||
| 59 | - Description | ||
| 60 | |||
| 61 | * - |TYPE| | ||
| 62 | - |u8| | ||
| 63 | - Type identifier of the frame. | ||
| 64 | |||
| 65 | * - |LEN| | ||
| 66 | - |u16| | ||
| 67 | - Length of the payload associated with the frame. | ||
| 68 | |||
| 69 | * - |SEQ| | ||
| 70 | - |u8| | ||
| 71 | - Sequence ID (see explanation below). | ||
| 72 | |||
| 73 | Each frame structure is followed by a CRC over this structure. The CRC over | ||
| 74 | the frame structure (|TYPE|, |LEN|, and |SEQ| fields) is placed directly | ||
| 75 | after the frame structure and before the payload. The payload is followed by | ||
| 76 | its own CRC (over all payload bytes). If the payload is not present (i.e. | ||
| 77 | the frame has ``LEN=0``), the CRC of the payload is still present and will | ||
| 78 | evaluate to ``0xffff``. The |LEN| field does not include any of the CRCs, it | ||
| 79 | equals the number of bytes inbetween the CRC of the frame and the CRC of the | ||
| 80 | payload. | ||
| 81 | |||
| 82 | Additionally, the following fixed two-byte sequences are used: | ||
| 83 | |||
| 84 | .. flat-table:: SSH Byte Sequences | ||
| 85 | :widths: 1 1 4 | ||
| 86 | :header-rows: 1 | ||
| 87 | |||
| 88 | * - Name | ||
| 89 | - Value | ||
| 90 | - Description | ||
| 91 | |||
| 92 | * - |SYN| | ||
| 93 | - ``[0xAA, 0x55]`` | ||
| 94 | - Synchronization bytes. | ||
| 95 | |||
| 96 | A message consists of |SYN|, followed by the frame (|TYPE|, |LEN|, |SEQ| and | ||
| 97 | CRC) and, if specified in the frame (i.e. ``LEN > 0``), payload bytes, | ||
| 98 | followed finally, regardless if the payload is present, the payload CRC. The | ||
| 99 | messages corresponding to an exchange are, in part, identified by having the | ||
| 100 | same sequence ID (|SEQ|), stored inside the frame (more on this in the next | ||
| 101 | section). The sequence ID is a wrapping counter. | ||
| 102 | |||
| 103 | A frame can have the following types | ||
| 104 | (:c:type:`enum ssh_frame_type <ssh_frame_type>`): | ||
| 105 | |||
| 106 | .. flat-table:: SSH Frame Types | ||
| 107 | :widths: 1 1 4 | ||
| 108 | :header-rows: 1 | ||
| 109 | |||
| 110 | * - Name | ||
| 111 | - Value | ||
| 112 | - Short Description | ||
| 113 | |||
| 114 | * - |NAK| | ||
| 115 | - ``0x04`` | ||
| 116 | - Sent on error in previously received message. | ||
| 117 | |||
| 118 | * - |ACK| | ||
| 119 | - ``0x40`` | ||
| 120 | - Sent to acknowledge receival of |DATA| frame. | ||
| 121 | |||
| 122 | * - |DATA_SEQ| | ||
| 123 | - ``0x80`` | ||
| 124 | - Sent to transfer data. Sequenced. | ||
| 125 | |||
| 126 | * - |DATA_NSQ| | ||
| 127 | - ``0x00`` | ||
| 128 | - Same as |DATA_SEQ|, but does not need to be ACKed. | ||
| 129 | |||
| 130 | Both |NAK|- and |ACK|-type frames are used to control flow of messages and | ||
| 131 | thus do not carry a payload. |DATA_SEQ|- and |DATA_NSQ|-type frames on the | ||
| 132 | other hand must carry a payload. The flow sequence and interaction of | ||
| 133 | different frame types will be described in more depth in the next section. | ||
| 134 | |||
| 135 | |||
| 136 | SSH Packet Protocol: Flow Sequence | ||
| 137 | ================================== | ||
| 138 | |||
| 139 | Each exchange begins with |SYN|, followed by a |DATA_SEQ|- or | ||
| 140 | |DATA_NSQ|-type frame, followed by its CRC, payload, and payload CRC. In | ||
| 141 | case of a |DATA_NSQ|-type frame, the exchange is then finished. In case of a | ||
| 142 | |DATA_SEQ|-type frame, the receiving party has to acknowledge receival of | ||
| 143 | the frame by responding with a message containing an |ACK|-type frame with | ||
| 144 | the same sequence ID of the |DATA| frame. In other words, the sequence ID of | ||
| 145 | the |ACK| frame specifies the |DATA| frame to be acknowledged. In case of an | ||
| 146 | error, e.g. an invalid CRC, the receiving party responds with a message | ||
| 147 | containing an |NAK|-type frame. As the sequence ID of the previous data | ||
| 148 | frame, for which an error is indicated via the |NAK| frame, cannot be relied | ||
| 149 | upon, the sequence ID of the |NAK| frame should not be used and is set to | ||
| 150 | zero. After receival of an |NAK| frame, the sending party should re-send all | ||
| 151 | outstanding (non-ACKed) messages. | ||
| 152 | |||
| 153 | Sequence IDs are not synchronized between the two parties, meaning that they | ||
| 154 | are managed independently for each party. Identifying the messages | ||
| 155 | corresponding to a single exchange thus relies on the sequence ID as well as | ||
| 156 | the type of the message, and the context. Specifically, the sequence ID is | ||
| 157 | used to associate an ``ACK`` with its ``DATA_SEQ``-type frame, but not | ||
| 158 | ``DATA_SEQ``- or ``DATA_NSQ``-type frames with other ``DATA``- type frames. | ||
| 159 | |||
| 160 | An example exchange might look like this: | ||
| 161 | |||
| 162 | :: | ||
| 163 | |||
| 164 | tx: -- SYN FRAME(D) CRC(F) PAYLOAD CRC(P) ----------------------------- | ||
| 165 | rx: ------------------------------------- SYN FRAME(A) CRC(F) CRC(P) -- | ||
| 166 | |||
| 167 | where both frames have the same sequence ID (``SEQ``). Here, ``FRAME(D)`` | ||
| 168 | indicates a |DATA_SEQ|-type frame, ``FRAME(A)`` an ``ACK``-type frame, | ||
| 169 | ``CRC(F)`` the CRC over the previous frame, ``CRC(P)`` the CRC over the | ||
| 170 | previous payload. In case of an error, the exchange would look like this: | ||
| 171 | |||
| 172 | :: | ||
| 173 | |||
| 174 | tx: -- SYN FRAME(D) CRC(F) PAYLOAD CRC(P) ----------------------------- | ||
| 175 | rx: ------------------------------------- SYN FRAME(N) CRC(F) CRC(P) -- | ||
| 176 | |||
| 177 | upon which the sender should re-send the message. ``FRAME(N)`` indicates an | ||
| 178 | |NAK|-type frame. Note that the sequence ID of the |NAK|-type frame is fixed | ||
| 179 | to zero. For |DATA_NSQ|-type frames, both exchanges are the same: | ||
| 180 | |||
| 181 | :: | ||
| 182 | |||
| 183 | tx: -- SYN FRAME(DATA_NSQ) CRC(F) PAYLOAD CRC(P) ---------------------- | ||
| 184 | rx: ------------------------------------------------------------------- | ||
| 185 | |||
| 186 | Here, an error can be detected, but not corrected or indicated to the | ||
| 187 | sending party. These exchanges are symmetric, i.e. switching ``rx`` and | ||
| 188 | ``tx`` results again in a valid exchange. Currently, no longer exchanges are | ||
| 189 | known. | ||
| 190 | |||
| 191 | |||
| 192 | Commands: Requests, Responses, and Events | ||
| 193 | ========================================= | ||
| 194 | |||
| 195 | Commands are sent as payload inside a data frame. Currently, this is the | ||
| 196 | only known payload type of |DATA| frames, with a payload-type value of | ||
| 197 | ``0x80`` (:c:type:`SSH_PLD_TYPE_CMD <ssh_payload_type>`). | ||
| 198 | |||
| 199 | The command-type payload (:c:type:`struct ssh_command <ssh_command>`) | ||
| 200 | consists of an eight-byte command structure, followed by optional and | ||
| 201 | variable length command data. The length of this optional data is derived | ||
| 202 | from the frame payload length given in the corresponding frame, i.e. it is | ||
| 203 | ``frame.len - sizeof(struct ssh_command)``. The command struct contains the | ||
| 204 | following fields, packed together and in order: | ||
| 205 | |||
| 206 | .. flat-table:: SSH Command | ||
| 207 | :widths: 1 1 4 | ||
| 208 | :header-rows: 1 | ||
| 209 | |||
| 210 | * - Field | ||
| 211 | - Type | ||
| 212 | - Description | ||
| 213 | |||
| 214 | * - |TYPE| | ||
| 215 | - |u8| | ||
| 216 | - Type of the payload. For commands always ``0x80``. | ||
| 217 | |||
| 218 | * - |TC| | ||
| 219 | - |u8| | ||
| 220 | - Target category. | ||
| 221 | |||
| 222 | * - |TID| (out) | ||
| 223 | - |u8| | ||
| 224 | - Target ID for outgoing (host to EC) commands. | ||
| 225 | |||
| 226 | * - |TID| (in) | ||
| 227 | - |u8| | ||
| 228 | - Target ID for incoming (EC to host) commands. | ||
| 229 | |||
| 230 | * - |IID| | ||
| 231 | - |u8| | ||
| 232 | - Instance ID. | ||
| 233 | |||
| 234 | * - |RQID| | ||
| 235 | - |u16| | ||
| 236 | - Request ID. | ||
| 237 | |||
| 238 | * - |CID| | ||
| 239 | - |u8| | ||
| 240 | - Command ID. | ||
| 241 | |||
| 242 | The command struct and data, in general, does not contain any failure | ||
| 243 | detection mechanism (e.g. CRCs), this is solely done on the frame level. | ||
| 244 | |||
| 245 | Command-type payloads are used by the host to send commands and requests to | ||
| 246 | the EC as well as by the EC to send responses and events back to the host. | ||
| 247 | We differentiate between requests (sent by the host), responses (sent by the | ||
| 248 | EC in response to a request), and events (sent by the EC without a preceding | ||
| 249 | request). | ||
| 250 | |||
| 251 | Commands and events are uniquely identified by their target category | ||
| 252 | (``TC``) and command ID (``CID``). The target category specifies a general | ||
| 253 | category for the command (e.g. system in general, vs. battery and AC, vs. | ||
| 254 | temperature, and so on), while the command ID specifies the command inside | ||
| 255 | that category. Only the combination of |TC| + |CID| is unique. Additionally, | ||
| 256 | commands have an instance ID (``IID``), which is used to differentiate | ||
| 257 | between different sub-devices. For example ``TC=3`` ``CID=1`` is a | ||
| 258 | request to get the temperature on a thermal sensor, where |IID| specifies | ||
| 259 | the respective sensor. If the instance ID is not used, it should be set to | ||
| 260 | zero. If instance IDs are used, they, in general, start with a value of one, | ||
| 261 | whereas zero may be used for instance independent queries, if applicable. A | ||
| 262 | response to a request should have the same target category, command ID, and | ||
| 263 | instance ID as the corresponding request. | ||
| 264 | |||
| 265 | Responses are matched to their corresponding request via the request ID | ||
| 266 | (``RQID``) field. This is a 16 bit wrapping counter similar to the sequence | ||
| 267 | ID on the frames. Note that the sequence ID of the frames for a | ||
| 268 | request-response pair does not match. Only the request ID has to match. | ||
| 269 | Frame-protocol wise these are two separate exchanges, and may even be | ||
| 270 | separated, e.g. by an event being sent after the request but before the | ||
| 271 | response. Not all commands produce a response, and this is not detectable by | ||
| 272 | |TC| + |CID|. It is the responsibility of the issuing party to wait for a | ||
| 273 | response (or signal this to the communication framework, as is done in | ||
| 274 | SAN/ACPI via the ``SNC`` flag). | ||
| 275 | |||
| 276 | Events are identified by unique and reserved request IDs. These IDs should | ||
| 277 | not be used by the host when sending a new request. They are used on the | ||
| 278 | host to, first, detect events and, second, match them with a registered | ||
| 279 | event handler. Request IDs for events are chosen by the host and directed to | ||
| 280 | the EC when setting up and enabling an event source (via the | ||
| 281 | enable-event-source request). The EC then uses the specified request ID for | ||
| 282 | events sent from the respective source. Note that an event should still be | ||
| 283 | identified by its target category, command ID, and, if applicable, instance | ||
| 284 | ID, as a single event source can send multiple different event types. In | ||
| 285 | general, however, a single target category should map to a single reserved | ||
| 286 | event request ID. | ||
| 287 | |||
| 288 | Furthermore, requests, responses, and events have an associated target ID | ||
| 289 | (``TID``). This target ID is split into output (host to EC) and input (EC to | ||
| 290 | host) fields, with the respecting other field (e.g. output field on incoming | ||
| 291 | messages) set to zero. Two ``TID`` values are known: Primary (``0x01``) and | ||
| 292 | secondary (``0x02``). In general, the response to a request should have the | ||
| 293 | same ``TID`` value, however, the field (output vs. input) should be used in | ||
| 294 | accordance to the direction in which the response is sent (i.e. on the input | ||
| 295 | field, as responses are generally sent from the EC to the host). | ||
| 296 | |||
| 297 | Note that, even though requests and events should be uniquely identifiable | ||
| 298 | by target category and command ID alone, the EC may require specific | ||
| 299 | target ID and instance ID values to accept a command. A command that is | ||
| 300 | accepted for ``TID=1``, for example, may not be accepted for ``TID=2`` | ||
| 301 | and vice versa. | ||
| 302 | |||
| 303 | |||
| 304 | Limitations and Observations | ||
| 305 | ============================ | ||
| 306 | |||
| 307 | The protocol can, in theory, handle up to ``U8_MAX`` frames in parallel, | ||
| 308 | with up to ``U16_MAX`` pending requests (neglecting request IDs reserved for | ||
| 309 | events). In practice, however, this is more limited. From our testing | ||
| 310 | (although via a python and thus a user-space program), it seems that the EC | ||
| 311 | can handle up to four requests (mostly) reliably in parallel at a certain | ||
| 312 | time. With five or more requests in parallel, consistent discarding of | ||
| 313 | commands (ACKed frame but no command response) has been observed. For five | ||
| 314 | simultaneous commands, this reproducibly resulted in one command being | ||
| 315 | dropped and four commands being handled. | ||
| 316 | |||
| 317 | However, it has also been noted that, even with three requests in parallel, | ||
| 318 | occasional frame drops happen. Apart from this, with a limit of three | ||
| 319 | pending requests, no dropped commands (i.e. command being dropped but frame | ||
| 320 | carrying command being ACKed) have been observed. In any case, frames (and | ||
| 321 | possibly also commands) should be re-sent by the host if a certain timeout | ||
| 322 | is exceeded. This is done by the EC for frames with a timeout of one second, | ||
| 323 | up to two re-tries (i.e. three transmissions in total). The limit of | ||
| 324 | re-tries also applies to received NAKs, and, in a worst case scenario, can | ||
| 325 | lead to entire messages being dropped. | ||
| 326 | |||
| 327 | While this also seems to work fine for pending data frames as long as no | ||
| 328 | transmission failures occur, implementation and handling of these seems to | ||
| 329 | depend on the assumption that there is only one non-acknowledged data frame. | ||
| 330 | In particular, the detection of repeated frames relies on the last sequence | ||
| 331 | number. This means that, if a frame that has been successfully received by | ||
| 332 | the EC is sent again, e.g. due to the host not receiving an |ACK|, the EC | ||
| 333 | will only detect this if it has the sequence ID of the last frame received | ||
| 334 | by the EC. As an example: Sending two frames with ``SEQ=0`` and ``SEQ=1`` | ||
| 335 | followed by a repetition of ``SEQ=0`` will not detect the second ``SEQ=0`` | ||
| 336 | frame as such, and thus execute the command in this frame each time it has | ||
| 337 | been received, i.e. twice in this example. Sending ``SEQ=0``, ``SEQ=1`` and | ||
| 338 | then repeating ``SEQ=1`` will detect the second ``SEQ=1`` as repetition of | ||
| 339 | the first one and ignore it, thus executing the contained command only once. | ||
| 340 | |||
| 341 | In conclusion, this suggests a limit of at most one pending un-ACKed frame | ||
| 342 | (per party, effectively leading to synchronous communication regarding | ||
| 343 | frames) and at most three pending commands. The limit to synchronous frame | ||
| 344 | transfers seems to be consistent with behavior observed on Windows. | ||
| @@ -324,6 +324,8 @@ Code Seq# Include File Comments · 323 unmodified lines | |||
| 324 | 0xA3 90-9F linux/dtlk.h | 324 | 0xA3 90-9F linux/dtlk.h |
| 325 | 0xA4 00-1F uapi/linux/tee.h Generic TEE subsystem | 325 | 0xA4 00-1F uapi/linux/tee.h Generic TEE subsystem |
| 326 | 0xA4 00-1F uapi/asm/sgx.h <mailto:linux-sgx@vger.kernel.org> | 326 | 0xA4 00-1F uapi/asm/sgx.h <mailto:linux-sgx@vger.kernel.org> |
| 327 | 0xA5 01 linux/surface_aggregator/cdev.h Microsoft Surface Platform System Aggregator | ||
| 328 | <mailto:luzmaximilian@gmail.com> | ||
| 327 | 0xAA 00-3F linux/uapi/linux/userfaultfd.h | 329 | 0xAA 00-3F linux/uapi/linux/userfaultfd.h |
| 328 | 0xAB 00-1F linux/nbd.h | 330 | 0xAB 00-1F linux/nbd.h |
| 329 | 0xAC 00-1F linux/raw.h | 331 | 0xAC 00-1F linux/raw.h |
| @@ -4946,17 +4946,17 @@ M: Matthew Garrett <mjg59@srcf.ucam.org> · 4945 unmodified lines | |||
| 4946 | M: Pali Rohár <pali@kernel.org> | 4946 | M: Pali Rohár <pali@kernel.org> |
| 4947 | L: platform-driver-x86@vger.kernel.org | 4947 | L: platform-driver-x86@vger.kernel.org |
| 4948 | S: Maintained | 4948 | S: Maintained |
| 4949 | F: drivers/platform/x86/dell-laptop.c | 4949 | F: drivers/platform/x86/dell/dell-laptop.c |
| 4950 | 4950 | ||
| 4951 | DELL LAPTOP FREEFALL DRIVER | 4951 | DELL LAPTOP FREEFALL DRIVER |
| 4952 | M: Pali Rohár <pali@kernel.org> | 4952 | M: Pali Rohár <pali@kernel.org> |
| 4953 | S: Maintained | 4953 | S: Maintained |
| 4954 | F: drivers/platform/x86/dell-smo8800.c | 4954 | F: drivers/platform/x86/dell/dell-smo8800.c |
| 4955 | 4955 | ||
| 4956 | DELL LAPTOP RBTN DRIVER | 4956 | DELL LAPTOP RBTN DRIVER |
| 4957 | M: Pali Rohár <pali@kernel.org> | 4957 | M: Pali Rohár <pali@kernel.org> |
| 4958 | S: Maintained | 4958 | S: Maintained |
| 4959 | F: drivers/platform/x86/dell-rbtn.* | 4959 | F: drivers/platform/x86/dell/dell-rbtn.* |
| 4960 | 4960 | ||
| 4961 | DELL LAPTOP SMM DRIVER | 4961 | DELL LAPTOP SMM DRIVER |
| 4962 | M: Pali Rohár <pali@kernel.org> | 4962 | M: Pali Rohár <pali@kernel.org> |
| @@ -4968,26 +4968,26 @@ DELL REMOTE BIOS UPDATE DRIVER · 5 unmodified lines | |||
| 4968 | M: Stuart Hayes <stuart.w.hayes@gmail.com> | 4968 | M: Stuart Hayes <stuart.w.hayes@gmail.com> |
| 4969 | L: platform-driver-x86@vger.kernel.org | 4969 | L: platform-driver-x86@vger.kernel.org |
| 4970 | S: Maintained | 4970 | S: Maintained |
| 4971 | F: drivers/platform/x86/dell_rbu.c | 4971 | F: drivers/platform/x86/dell/dell_rbu.c |
| 4972 | 4972 | ||
| 4973 | DELL SMBIOS DRIVER | 4973 | DELL SMBIOS DRIVER |
| 4974 | M: Pali Rohár <pali@kernel.org> | 4974 | M: Pali Rohár <pali@kernel.org> |
| 4975 | M: Mario Limonciello <mario.limonciello@dell.com> | 4975 | M: Mario Limonciello <mario.limonciello@dell.com> |
| 4976 | L: platform-driver-x86@vger.kernel.org | 4976 | L: platform-driver-x86@vger.kernel.org |
| 4977 | S: Maintained | 4977 | S: Maintained |
| 4978 | F: drivers/platform/x86/dell-smbios.* | 4978 | F: drivers/platform/x86/dell/dell-smbios.* |
| 4979 | 4979 | ||
| 4980 | DELL SMBIOS SMM DRIVER | 4980 | DELL SMBIOS SMM DRIVER |
| 4981 | M: Mario Limonciello <mario.limonciello@dell.com> | 4981 | M: Mario Limonciello <mario.limonciello@dell.com> |
| 4982 | L: platform-driver-x86@vger.kernel.org | 4982 | L: platform-driver-x86@vger.kernel.org |
| 4983 | S: Maintained | 4983 | S: Maintained |
| 4984 | F: drivers/platform/x86/dell-smbios-smm.c | 4984 | F: drivers/platform/x86/dell/dell-smbios-smm.c |
| 4985 | 4985 | ||
| 4986 | DELL SMBIOS WMI DRIVER | 4986 | DELL SMBIOS WMI DRIVER |
| 4987 | M: Mario Limonciello <mario.limonciello@dell.com> | 4987 | M: Mario Limonciello <mario.limonciello@dell.com> |
| 4988 | L: platform-driver-x86@vger.kernel.org | 4988 | L: platform-driver-x86@vger.kernel.org |
| 4989 | S: Maintained | 4989 | S: Maintained |
| 4990 | F: drivers/platform/x86/dell-smbios-wmi.c | 4990 | F: drivers/platform/x86/dell/dell-smbios-wmi.c |
| 4991 | F: tools/wmi/dell-smbios-example.c | 4991 | F: tools/wmi/dell-smbios-example.c |
| 4992 | 4992 | ||
| 4993 | DELL SYSTEMS MANAGEMENT BASE DRIVER (dcdbas) | 4993 | DELL SYSTEMS MANAGEMENT BASE DRIVER (dcdbas) |
| @@ -4995,12 +4995,12 @@ M: Stuart Hayes <stuart.w.hayes@gmail.com> · 1 unmodified line | |||
| 4995 | L: platform-driver-x86@vger.kernel.org | 4995 | L: platform-driver-x86@vger.kernel.org |
| 4996 | S: Maintained | 4996 | S: Maintained |
| 4997 | F: Documentation/driver-api/dcdbas.rst | 4997 | F: Documentation/driver-api/dcdbas.rst |
| 4998 | F: drivers/platform/x86/dcdbas.* | 4998 | F: drivers/platform/x86/dell/dcdbas.* |
| 4999 | 4999 | ||
| 5000 | DELL WMI DESCRIPTOR DRIVER | 5000 | DELL WMI DESCRIPTOR DRIVER |
| 5001 | M: Mario Limonciello <mario.limonciello@dell.com> | 5001 | M: Mario Limonciello <mario.limonciello@dell.com> |
| 5002 | S: Maintained | 5002 | S: Maintained |
| 5003 | F: drivers/platform/x86/dell-wmi-descriptor.c | 5003 | F: drivers/platform/x86/dell/dell-wmi-descriptor.c |
| 5004 | 5004 | ||
| 5005 | DELL WMI SYSMAN DRIVER | 5005 | DELL WMI SYSMAN DRIVER |
| 5006 | M: Divya Bharathi <divya.bharathi@dell.com> | 5006 | M: Divya Bharathi <divya.bharathi@dell.com> |
| @@ -5009,13 +5009,13 @@ M: Prasanth Ksr <prasanth.ksr@dell.com> · 2 unmodified lines | |||
| 5009 | L: platform-driver-x86@vger.kernel.org | 5009 | L: platform-driver-x86@vger.kernel.org |
| 5010 | S: Maintained | 5010 | S: Maintained |
| 5011 | F: Documentation/ABI/testing/sysfs-class-firmware-attributes | 5011 | F: Documentation/ABI/testing/sysfs-class-firmware-attributes |
| 5012 | F: drivers/platform/x86/dell-wmi-sysman/ | 5012 | F: drivers/platform/x86/dell/dell-wmi-sysman/ |
| 5013 | 5013 | ||
| 5014 | DELL WMI NOTIFICATIONS DRIVER | 5014 | DELL WMI NOTIFICATIONS DRIVER |
| 5015 | M: Matthew Garrett <mjg59@srcf.ucam.org> | 5015 | M: Matthew Garrett <mjg59@srcf.ucam.org> |
| 5016 | M: Pali Rohár <pali@kernel.org> | 5016 | M: Pali Rohár <pali@kernel.org> |
| 5017 | S: Maintained | 5017 | S: Maintained |
| 5018 | F: drivers/platform/x86/dell-wmi.c | 5018 | F: drivers/platform/x86/dell/dell-wmi.c |
| 5019 | 5019 | ||
| 5020 | DELTA ST MEDIA DRIVER | 5020 | DELTA ST MEDIA DRIVER |
| 5021 | M: Hugues Fruchet <hugues.fruchet@st.com> | 5021 | M: Hugues Fruchet <hugues.fruchet@st.com> |
| @@ -8908,7 +8908,6 @@ L: linux-gpio@vger.kernel.org · 3886 unmodified lines | |||
| 8908 | S: Maintained | 8908 | S: Maintained |
| 8909 | T: git git://git.kernel.org/pub/scm/linux/kernel/git/andy/linux-gpio-intel.git | 8909 | T: git git://git.kernel.org/pub/scm/linux/kernel/git/andy/linux-gpio-intel.git |
| 8910 | F: drivers/gpio/gpio-ich.c | 8910 | F: drivers/gpio/gpio-ich.c |
| 8911 | F: drivers/gpio/gpio-intel-mid.c | ||
| 8912 | F: drivers/gpio/gpio-merrifield.c | 8911 | F: drivers/gpio/gpio-merrifield.c |
| 8913 | F: drivers/gpio/gpio-ml-ioh.c | 8912 | F: drivers/gpio/gpio-ml-ioh.c |
| 8914 | F: drivers/gpio/gpio-pch.c | 8913 | F: drivers/gpio/gpio-pch.c |
| @@ -9080,7 +9079,6 @@ M: Andy Shevchenko <andy@kernel.org> · 165 unmodified lines | |||
| 9080 | S: Maintained | 9079 | S: Maintained |
| 9081 | T: git git://git.kernel.org/pub/scm/linux/kernel/git/andy/linux-gpio-intel.git | 9080 | T: git git://git.kernel.org/pub/scm/linux/kernel/git/andy/linux-gpio-intel.git |
| 9082 | F: drivers/gpio/gpio-*cove.c | 9081 | F: drivers/gpio/gpio-*cove.c |
| 9083 | F: drivers/gpio/gpio-msic.c | ||
| 9084 | 9082 | ||
| 9085 | INTEL PMIC MULTIFUNCTION DEVICE DRIVERS | 9083 | INTEL PMIC MULTIFUNCTION DEVICE DRIVERS |
| 9086 | M: Andy Shevchenko <andy@kernel.org> | 9084 | M: Andy Shevchenko <andy@kernel.org> |
| @@ -11798,12 +11796,31 @@ S: Maintained · 2711 unmodified lines | |||
| 11798 | T: git git://git.kernel.org/pub/scm/linux/kernel/git/pdx86/platform-drivers-x86.git | 11796 | T: git git://git.kernel.org/pub/scm/linux/kernel/git/pdx86/platform-drivers-x86.git |
| 11799 | F: drivers/platform/surface/ | 11797 | F: drivers/platform/surface/ |
| 11800 | 11798 | ||
| 11799 | MICROSOFT SURFACE HOT-PLUG DRIVER | ||
| 11800 | M: Maximilian Luz <luzmaximilian@gmail.com> | ||
| 11801 | L: platform-driver-x86@vger.kernel.org | ||
| 11802 | S: Maintained | ||
| 11803 | F: drivers/platform/surface/surface_hotplug.c | ||
| 11804 | |||
| 11801 | MICROSOFT SURFACE PRO 3 BUTTON DRIVER | 11805 | MICROSOFT SURFACE PRO 3 BUTTON DRIVER |
| 11802 | M: Chen Yu <yu.c.chen@intel.com> | 11806 | M: Chen Yu <yu.c.chen@intel.com> |
| 11803 | L: platform-driver-x86@vger.kernel.org | 11807 | L: platform-driver-x86@vger.kernel.org |
| 11804 | S: Supported | 11808 | S: Supported |
| 11805 | F: drivers/platform/surface/surfacepro3_button.c | 11809 | F: drivers/platform/surface/surfacepro3_button.c |
| 11806 | 11810 | ||
| 11811 | MICROSOFT SURFACE SYSTEM AGGREGATOR SUBSYSTEM | ||
| 11812 | M: Maximilian Luz <luzmaximilian@gmail.com> | ||
| 11813 | S: Maintained | ||
| 11814 | W: https://github.com/linux-surface/surface-aggregator-module | ||
| 11815 | C: irc://chat.freenode.net/##linux-surface | ||
| 11816 | F: Documentation/driver-api/surface_aggregator/ | ||
| 11817 | F: drivers/platform/surface/aggregator/ | ||
| 11818 | F: drivers/platform/surface/surface_acpi_notify.c | ||
| 11819 | F: drivers/platform/surface/surface_aggregator_cdev.c | ||
| 11820 | F: include/linux/surface_acpi_notify.h | ||
| 11821 | F: include/linux/surface_aggregator/ | ||
| 11822 | F: include/uapi/linux/surface_aggregator/ | ||
| 11823 | |||
| 11807 | MICROTEK X6 SCANNER | 11824 | MICROTEK X6 SCANNER |
| 11808 | M: Oliver Neukum <oliver@neukum.org> | 11825 | M: Oliver Neukum <oliver@neukum.org> |
| 11809 | S: Maintained | 11826 | S: Maintained |
| @@ -17656,7 +17673,7 @@ F: drivers/thermal/gov_power_allocator.c · 5846 unmodified lines | |||
| 17656 | F: include/trace/events/thermal_power_allocator.h | 17673 | F: include/trace/events/thermal_power_allocator.h |
| 17657 | 17674 | ||
| 17658 | THINKPAD ACPI EXTRAS DRIVER | 17675 | THINKPAD ACPI EXTRAS DRIVER |
| 17659 | M: Henrique de Moraes Holschuh <ibm-acpi@hmh.eng.br> | 17676 | M: Henrique de Moraes Holschuh <hmh@hmh.eng.br> |
| 17660 | L: ibm-acpi-devel@lists.sourceforge.net | 17677 | L: ibm-acpi-devel@lists.sourceforge.net |
| 17661 | L: platform-driver-x86@vger.kernel.org | 17678 | L: platform-driver-x86@vger.kernel.org |
| 17662 | S: Maintained | 17679 | S: Maintained |
| @@ -30,4 +30,3 @@ obj-$(subst m,y,$(CONFIG_GPIO_PCA953X)) += platform_tca6416.o · 29 unmodified lines | |||
| 30 | obj-$(subst m,y,$(CONFIG_KEYBOARD_GPIO)) += platform_gpio_keys.o | 30 | obj-$(subst m,y,$(CONFIG_KEYBOARD_GPIO)) += platform_gpio_keys.o |
| 31 | obj-$(subst m,y,$(CONFIG_INTEL_MID_POWER_BUTTON)) += platform_mrfld_power_btn.o | 31 | obj-$(subst m,y,$(CONFIG_INTEL_MID_POWER_BUTTON)) += platform_mrfld_power_btn.o |
| 32 | obj-$(subst m,y,$(CONFIG_RTC_DRV_CMOS)) += platform_mrfld_rtc.o | 32 | obj-$(subst m,y,$(CONFIG_RTC_DRV_CMOS)) += platform_mrfld_rtc.o |
| 33 | obj-$(subst m,y,$(CONFIG_INTEL_MID_WATCHDOG)) += platform_mrfld_wdt.o | ||
| @@ -1253,13 +1253,6 @@ config GPIO_MAX77650 · 1252 unmodified lines | |||
| 1253 | GPIO driver for MAX77650/77651 PMIC from Maxim Semiconductor. | 1253 | GPIO driver for MAX77650/77651 PMIC from Maxim Semiconductor. |
| 1254 | These chips have a single pin that can be configured as GPIO. | 1254 | These chips have a single pin that can be configured as GPIO. |
| 1255 | 1255 | ||
| 1256 | config GPIO_MSIC | ||
| 1257 | bool "Intel MSIC mixed signal gpio support" | ||
| 1258 | depends on (X86 || COMPILE_TEST) && MFD_INTEL_MSIC | ||
| 1259 | help | ||
| 1260 | Enable support for GPIO on intel MSIC controllers found in | ||
| 1261 | intel MID devices | ||
| 1262 | |||
| 1263 | config GPIO_PALMAS | 1256 | config GPIO_PALMAS |
| 1264 | bool "TI PALMAS series PMICs GPIO" | 1257 | bool "TI PALMAS series PMICs GPIO" |
| 1265 | depends on MFD_PALMAS | 1258 | depends on MFD_PALMAS |
| @@ -1455,13 +1448,6 @@ config GPIO_BT8XX · 189 unmodified lines | |||
| 1455 | 1448 | ||
| 1456 | If unsure, say N. | 1449 | If unsure, say N. |
| 1457 | 1450 | ||
| 1458 | config GPIO_INTEL_MID | ||
| 1459 | bool "Intel MID GPIO support" | ||
| 1460 | depends on X86_INTEL_MID | ||
| 1461 | select GPIOLIB_IRQCHIP | ||
| 1462 | help | ||
| 1463 | Say Y here to support Intel MID GPIO. | ||
| 1464 | |||
| 1465 | config GPIO_MERRIFIELD | 1451 | config GPIO_MERRIFIELD |
| 1466 | tristate "Intel Merrifield GPIO support" | 1452 | tristate "Intel Merrifield GPIO support" |
| 1467 | depends on X86_INTEL_MID | 1453 | depends on X86_INTEL_MID |
| @@ -67,7 +67,6 @@ obj-$(CONFIG_GPIO_HISI) += gpio-hisi.o · 66 unmodified lines | |||
| 67 | obj-$(CONFIG_GPIO_HLWD) += gpio-hlwd.o | 67 | obj-$(CONFIG_GPIO_HLWD) += gpio-hlwd.o |
| 68 | obj-$(CONFIG_HTC_EGPIO) += gpio-htc-egpio.o | 68 | obj-$(CONFIG_HTC_EGPIO) += gpio-htc-egpio.o |
| 69 | obj-$(CONFIG_GPIO_ICH) += gpio-ich.o | 69 | obj-$(CONFIG_GPIO_ICH) += gpio-ich.o |
| 70 | obj-$(CONFIG_GPIO_INTEL_MID) += gpio-intel-mid.o | ||
| 71 | obj-$(CONFIG_GPIO_IOP) += gpio-iop.o | 70 | obj-$(CONFIG_GPIO_IOP) += gpio-iop.o |
| 72 | obj-$(CONFIG_GPIO_IT87) += gpio-it87.o | 71 | obj-$(CONFIG_GPIO_IT87) += gpio-it87.o |
| 73 | obj-$(CONFIG_GPIO_IXP4XX) += gpio-ixp4xx.o | 72 | obj-$(CONFIG_GPIO_IXP4XX) += gpio-ixp4xx.o |
| @@ -101,7 +101,7 @@ for a few GPIOs. Those should stay where they are. · 100 unmodified lines | |||
| 101 | 101 | ||
| 102 | At the same time it makes sense to get rid of code duplication in existing or | 102 | At the same time it makes sense to get rid of code duplication in existing or |
| 103 | new coming drivers. For example, gpio-ml-ioh should be incorporated into | 103 | new coming drivers. For example, gpio-ml-ioh should be incorporated into |
| 104 | gpio-pch. In similar way gpio-intel-mid into gpio-pxa. | 104 | gpio-pch. |
| 105 | 105 | ||
| 106 | 106 | ||
| 107 | Generic MMIO GPIO | 107 | Generic MMIO GPIO |
| @@ -1,414 +0,0 @@ | |||
| 1 | // SPDX-License-Identifier: GPL-2.0 | ||
| 2 | /* | ||
| 3 | * Intel MID GPIO driver | ||
| 4 | * | ||
| 5 | * Copyright (c) 2008-2014,2016 Intel Corporation. | ||
| 6 | */ | ||
| 7 | |||
| 8 | /* Supports: | ||
| 9 | * Moorestown platform Langwell chip. | ||
| 10 | * Medfield platform Penwell chip. | ||
| 11 | * Clovertrail platform Cloverview chip. | ||
| 12 | */ | ||
| 13 | |||
| 14 | #include <linux/delay.h> | ||
| 15 | #include <linux/gpio/driver.h> | ||
| 16 | #include <linux/init.h> | ||
| 17 | #include <linux/interrupt.h> | ||
| 18 | #include <linux/io.h> | ||
| 19 | #include <linux/kernel.h> | ||
| 20 | #include <linux/pci.h> | ||
| 21 | #include <linux/platform_device.h> | ||
| 22 | #include <linux/pm_runtime.h> | ||
| 23 | #include <linux/slab.h> | ||
| 24 | #include <linux/stddef.h> | ||
| 25 | |||
| 26 | #define INTEL_MID_IRQ_TYPE_EDGE (1 << 0) | ||
| 27 | #define INTEL_MID_IRQ_TYPE_LEVEL (1 << 1) | ||
| 28 | |||
| 29 | /* | ||
| 30 | * Langwell chip has 64 pins and thus there are 2 32bit registers to control | ||
| 31 | * each feature, while Penwell chip has 96 pins for each block, and need 3 32bit | ||
| 32 | * registers to control them, so we only define the order here instead of a | ||
| 33 | * structure, to get a bit offset for a pin (use GPDR as an example): | ||
| 34 | * | ||
| 35 | * nreg = ngpio / 32; | ||
| 36 | * reg = offset / 32; | ||
| 37 | * bit = offset % 32; | ||
| 38 | * reg_addr = reg_base + GPDR * nreg * 4 + reg * 4; | ||
| 39 | * | ||
| 40 | * so the bit of reg_addr is to control pin offset's GPDR feature | ||
| 41 | */ | ||
| 42 | |||
| 43 | enum GPIO_REG { | ||
| 44 | GPLR = 0, /* pin level read-only */ | ||
| 45 | GPDR, /* pin direction */ | ||
| 46 | GPSR, /* pin set */ | ||
| 47 | GPCR, /* pin clear */ | ||
| 48 | GRER, /* rising edge detect */ | ||
| 49 | GFER, /* falling edge detect */ | ||
| 50 | GEDR, /* edge detect result */ | ||
| 51 | GAFR, /* alt function */ | ||
| 52 | }; | ||
| 53 | |||
| 54 | /* intel_mid gpio driver data */ | ||
| 55 | struct intel_mid_gpio_ddata { | ||
| 56 | u16 ngpio; /* number of gpio pins */ | ||
| 57 | u32 chip_irq_type; /* chip interrupt type */ | ||
| 58 | }; | ||
| 59 | |||
| 60 | struct intel_mid_gpio { | ||
| 61 | struct gpio_chip chip; | ||
| 62 | void __iomem *reg_base; | ||
| 63 | spinlock_t lock; | ||
| 64 | struct pci_dev *pdev; | ||
| 65 | }; | ||
| 66 | |||
| 67 | static void __iomem *gpio_reg(struct gpio_chip *chip, unsigned offset, | ||
| 68 | enum GPIO_REG reg_type) | ||
| 69 | { | ||
| 70 | struct intel_mid_gpio *priv = gpiochip_get_data(chip); | ||
| 71 | unsigned nreg = chip->ngpio / 32; | ||
| 72 | u8 reg = offset / 32; | ||
| 73 | |||
| 74 | return priv->reg_base + reg_type * nreg * 4 + reg * 4; | ||
| 75 | } | ||
| 76 | |||
| 77 | static void __iomem *gpio_reg_2bit(struct gpio_chip *chip, unsigned offset, | ||
| 78 | enum GPIO_REG reg_type) | ||
| 79 | { | ||
| 80 | struct intel_mid_gpio *priv = gpiochip_get_data(chip); | ||
| 81 | unsigned nreg = chip->ngpio / 32; | ||
| 82 | u8 reg = offset / 16; | ||
| 83 | |||
| 84 | return priv->reg_base + reg_type * nreg * 4 + reg * 4; | ||
| 85 | } | ||
| 86 | |||
| 87 | static int intel_gpio_request(struct gpio_chip *chip, unsigned offset) | ||
| 88 | { | ||
| 89 | void __iomem *gafr = gpio_reg_2bit(chip, offset, GAFR); | ||
| 90 | u32 value = readl(gafr); | ||
| 91 | int shift = (offset % 16) << 1, af = (value >> shift) & 3; | ||
| 92 | |||
| 93 | if (af) { | ||
| 94 | value &= ~(3 << shift); | ||
| 95 | writel(value, gafr); | ||
| 96 | } | ||
| 97 | return 0; | ||
| 98 | } | ||
| 99 | |||
| 100 | static int intel_gpio_get(struct gpio_chip *chip, unsigned offset) | ||
| 101 | { | ||
| 102 | void __iomem *gplr = gpio_reg(chip, offset, GPLR); | ||
| 103 | |||
| 104 | return !!(readl(gplr) & BIT(offset % 32)); | ||
| 105 | } | ||
| 106 | |||
| 107 | static void intel_gpio_set(struct gpio_chip *chip, unsigned offset, int value) | ||
| 108 | { | ||
| 109 | void __iomem *gpsr, *gpcr; | ||
| 110 | |||
| 111 | if (value) { | ||
| 112 | gpsr = gpio_reg(chip, offset, GPSR); | ||
| 113 | writel(BIT(offset % 32), gpsr); | ||
| 114 | } else { | ||
| 115 | gpcr = gpio_reg(chip, offset, GPCR); | ||
| 116 | writel(BIT(offset % 32), gpcr); | ||
| 117 | } | ||
| 118 | } | ||
| 119 | |||
| 120 | static int intel_gpio_direction_input(struct gpio_chip *chip, unsigned offset) | ||
| 121 | { | ||
| 122 | struct intel_mid_gpio *priv = gpiochip_get_data(chip); | ||
| 123 | void __iomem *gpdr = gpio_reg(chip, offset, GPDR); | ||
| 124 | u32 value; | ||
| 125 | unsigned long flags; | ||
| 126 | |||
| 127 | if (priv->pdev) | ||
| 128 | pm_runtime_get(&priv->pdev->dev); | ||
| 129 | |||
| 130 | spin_lock_irqsave(&priv->lock, flags); | ||
| 131 | value = readl(gpdr); | ||
| 132 | value &= ~BIT(offset % 32); | ||
| 133 | writel(value, gpdr); | ||
| 134 | spin_unlock_irqrestore(&priv->lock, flags); | ||
| 135 | |||
| 136 | if (priv->pdev) | ||
| 137 | pm_runtime_put(&priv->pdev->dev); | ||
| 138 | |||
| 139 | return 0; | ||
| 140 | } | ||
| 141 | |||
| 142 | static int intel_gpio_direction_output(struct gpio_chip *chip, | ||
| 143 | unsigned offset, int value) | ||
| 144 | { | ||
| 145 | struct intel_mid_gpio *priv = gpiochip_get_data(chip); | ||
| 146 | void __iomem *gpdr = gpio_reg(chip, offset, GPDR); | ||
| 147 | unsigned long flags; | ||
| 148 | |||
| 149 | intel_gpio_set(chip, offset, value); | ||
| 150 | |||
| 151 | if (priv->pdev) | ||
| 152 | pm_runtime_get(&priv->pdev->dev); | ||
| 153 | |||
| 154 | spin_lock_irqsave(&priv->lock, flags); | ||
| 155 | value = readl(gpdr); | ||
| 156 | value |= BIT(offset % 32); | ||
| 157 | writel(value, gpdr); | ||
| 158 | spin_unlock_irqrestore(&priv->lock, flags); | ||
| 159 | |||
| 160 | if (priv->pdev) | ||
| 161 | pm_runtime_put(&priv->pdev->dev); | ||
| 162 | |||
| 163 | return 0; | ||
| 164 | } | ||
| 165 | |||
| 166 | static int intel_mid_irq_type(struct irq_data *d, unsigned type) | ||
| 167 | { | ||
| 168 | struct gpio_chip *gc = irq_data_get_irq_chip_data(d); | ||
| 169 | struct intel_mid_gpio *priv = gpiochip_get_data(gc); | ||
| 170 | u32 gpio = irqd_to_hwirq(d); | ||
| 171 | unsigned long flags; | ||
| 172 | u32 value; | ||
| 173 | void __iomem *grer = gpio_reg(&priv->chip, gpio, GRER); | ||
| 174 | void __iomem *gfer = gpio_reg(&priv->chip, gpio, GFER); | ||
| 175 | |||
| 176 | if (gpio >= priv->chip.ngpio) | ||
| 177 | return -EINVAL; | ||
| 178 | |||
| 179 | if (priv->pdev) | ||
| 180 | pm_runtime_get(&priv->pdev->dev); | ||
| 181 | |||
| 182 | spin_lock_irqsave(&priv->lock, flags); | ||
| 183 | if (type & IRQ_TYPE_EDGE_RISING) | ||
| 184 | value = readl(grer) | BIT(gpio % 32); | ||
| 185 | else | ||
| 186 | value = readl(grer) & (~BIT(gpio % 32)); | ||
| 187 | writel(value, grer); | ||
| 188 | |||
| 189 | if (type & IRQ_TYPE_EDGE_FALLING) | ||
| 190 | value = readl(gfer) | BIT(gpio % 32); | ||
| 191 | else | ||
| 192 | value = readl(gfer) & (~BIT(gpio % 32)); | ||
| 193 | writel(value, gfer); | ||
| 194 | spin_unlock_irqrestore(&priv->lock, flags); | ||
| 195 | |||
| 196 | if (priv->pdev) | ||
| 197 | pm_runtime_put(&priv->pdev->dev); | ||
| 198 | |||
| 199 | return 0; | ||
| 200 | } | ||
| 201 | |||
| 202 | static void intel_mid_irq_unmask(struct irq_data *d) | ||
| 203 | { | ||
| 204 | } | ||
| 205 | |||
| 206 | static void intel_mid_irq_mask(struct irq_data *d) | ||
| 207 | { | ||
| 208 | } | ||
| 209 | |||
| 210 | static struct irq_chip intel_mid_irqchip = { | ||
| 211 | .name = "INTEL_MID-GPIO", | ||
| 212 | .irq_mask = intel_mid_irq_mask, | ||
| 213 | .irq_unmask = intel_mid_irq_unmask, | ||
| 214 | .irq_set_type = intel_mid_irq_type, | ||
| 215 | }; | ||
| 216 | |||
| 217 | static const struct intel_mid_gpio_ddata gpio_lincroft = { | ||
| 218 | .ngpio = 64, | ||
| 219 | }; | ||
| 220 | |||
| 221 | static const struct intel_mid_gpio_ddata gpio_penwell_aon = { | ||
| 222 | .ngpio = 96, | ||
| 223 | .chip_irq_type = INTEL_MID_IRQ_TYPE_EDGE, | ||
| 224 | }; | ||
| 225 | |||
| 226 | static const struct intel_mid_gpio_ddata gpio_penwell_core = { | ||
| 227 | .ngpio = 96, | ||
| 228 | .chip_irq_type = INTEL_MID_IRQ_TYPE_EDGE, | ||
| 229 | }; | ||
| 230 | |||
| 231 | static const struct intel_mid_gpio_ddata gpio_cloverview_aon = { | ||
| 232 | .ngpio = 96, | ||
| 233 | .chip_irq_type = INTEL_MID_IRQ_TYPE_EDGE | INTEL_MID_IRQ_TYPE_LEVEL, | ||
| 234 | }; | ||
| 235 | |||
| 236 | static const struct intel_mid_gpio_ddata gpio_cloverview_core = { | ||
| 237 | .ngpio = 96, | ||
| 238 | .chip_irq_type = INTEL_MID_IRQ_TYPE_EDGE, | ||
| 239 | }; | ||
| 240 | |||
| 241 | static const struct pci_device_id intel_gpio_ids[] = { | ||
| 242 | { | ||
| 243 | /* Lincroft */ | ||
| 244 | PCI_DEVICE(PCI_VENDOR_ID_INTEL, 0x080f), | ||
| 245 | .driver_data = (kernel_ulong_t)&gpio_lincroft, | ||
| 246 | }, | ||
| 247 | { | ||
| 248 | /* Penwell AON */ | ||
| 249 | PCI_DEVICE(PCI_VENDOR_ID_INTEL, 0x081f), | ||
| 250 | .driver_data = (kernel_ulong_t)&gpio_penwell_aon, | ||
| 251 | }, | ||
| 252 | { | ||
| 253 | /* Penwell Core */ | ||
| 254 | PCI_DEVICE(PCI_VENDOR_ID_INTEL, 0x081a), | ||
| 255 | .driver_data = (kernel_ulong_t)&gpio_penwell_core, | ||
| 256 | }, | ||
| 257 | { | ||
| 258 | /* Cloverview Aon */ | ||
| 259 | PCI_DEVICE(PCI_VENDOR_ID_INTEL, 0x08eb), | ||
| 260 | .driver_data = (kernel_ulong_t)&gpio_cloverview_aon, | ||
| 261 | }, | ||
| 262 | { | ||
| 263 | /* Cloverview Core */ | ||
| 264 | PCI_DEVICE(PCI_VENDOR_ID_INTEL, 0x08f7), | ||
| 265 | .driver_data = (kernel_ulong_t)&gpio_cloverview_core, | ||
| 266 | }, | ||
| 267 | { } | ||
| 268 | }; | ||
| 269 | |||
| 270 | static void intel_mid_irq_handler(struct irq_desc *desc) | ||
| 271 | { | ||
| 272 | struct gpio_chip *gc = irq_desc_get_handler_data(desc); | ||
| 273 | struct intel_mid_gpio *priv = gpiochip_get_data(gc); | ||
| 274 | struct irq_data *data = irq_desc_get_irq_data(desc); | ||
| 275 | struct irq_chip *chip = irq_data_get_irq_chip(data); | ||
| 276 | u32 base, gpio, mask; | ||
| 277 | unsigned long pending; | ||
| 278 | void __iomem *gedr; | ||
| 279 | |||
| 280 | /* check GPIO controller to check which pin triggered the interrupt */ | ||
| 281 | for (base = 0; base < priv->chip.ngpio; base += 32) { | ||
| 282 | gedr = gpio_reg(&priv->chip, base, GEDR); | ||
| 283 | while ((pending = readl(gedr))) { | ||
| 284 | gpio = __ffs(pending); | ||
| 285 | mask = BIT(gpio); | ||
| 286 | /* Clear before handling so we can't lose an edge */ | ||
| 287 | writel(mask, gedr); | ||
| 288 | generic_handle_irq(irq_find_mapping(gc->irq.domain, | ||
| 289 | base + gpio)); | ||
| 290 | } | ||
| 291 | } | ||
| 292 | |||
| 293 | chip->irq_eoi(data); | ||
| 294 | } | ||
| 295 | |||
| 296 | static int intel_mid_irq_init_hw(struct gpio_chip *chip) | ||
| 297 | { | ||
| 298 | struct intel_mid_gpio *priv = gpiochip_get_data(chip); | ||
| 299 | void __iomem *reg; | ||
| 300 | unsigned base; | ||
| 301 | |||
| 302 | for (base = 0; base < priv->chip.ngpio; base += 32) { | ||
| 303 | /* Clear the rising-edge detect register */ | ||
| 304 | reg = gpio_reg(&priv->chip, base, GRER); | ||
| 305 | writel(0, reg); | ||
| 306 | /* Clear the falling-edge detect register */ | ||
| 307 | reg = gpio_reg(&priv->chip, base, GFER); | ||
| 308 | writel(0, reg); | ||
| 309 | /* Clear the edge detect status register */ | ||
| 310 | reg = gpio_reg(&priv->chip, base, GEDR); | ||
| 311 | writel(~0, reg); | ||
| 312 | } | ||
| 313 | |||
| 314 | return 0; | ||
| 315 | } | ||
| 316 | |||
| 317 | static int __maybe_unused intel_gpio_runtime_idle(struct device *dev) | ||
| 318 | { | ||
| 319 | int err = pm_schedule_suspend(dev, 500); | ||
| 320 | return err ?: -EBUSY; | ||
| 321 | } | ||
| 322 | |||
| 323 | static const struct dev_pm_ops intel_gpio_pm_ops = { | ||
| 324 | SET_RUNTIME_PM_OPS(NULL, NULL, intel_gpio_runtime_idle) | ||
| 325 | }; | ||
| 326 | |||
| 327 | static int intel_gpio_probe(struct pci_dev *pdev, | ||
| 328 | const struct pci_device_id *id) | ||
| 329 | { | ||
| 330 | void __iomem *base; | ||
| 331 | struct intel_mid_gpio *priv; | ||
| 332 | u32 gpio_base; | ||
| 333 | u32 irq_base; | ||
| 334 | int retval; | ||
| 335 | struct gpio_irq_chip *girq; | ||
| 336 | struct intel_mid_gpio_ddata *ddata = | ||
| 337 | (struct intel_mid_gpio_ddata *)id->driver_data; | ||
| 338 | |||
| 339 | retval = pcim_enable_device(pdev); | ||
| 340 | if (retval) | ||
| 341 | return retval; | ||
| 342 | |||
| 343 | retval = pcim_iomap_regions(pdev, 1 << 0 | 1 << 1, pci_name(pdev)); | ||
| 344 | if (retval) { | ||
| 345 | dev_err(&pdev->dev, "I/O memory mapping error\n"); | ||
| 346 | return retval; | ||
| 347 | } | ||
| 348 | |||
| 349 | base = pcim_iomap_table(pdev)[1]; | ||
| 350 | |||
| 351 | irq_base = readl(base); | ||
| 352 | gpio_base = readl(sizeof(u32) + base); | ||
| 353 | |||
| 354 | /* release the IO mapping, since we already get the info from bar1 */ | ||
| 355 | pcim_iounmap_regions(pdev, 1 << 1); | ||
| 356 | |||
| 357 | priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL); | ||
| 358 | if (!priv) | ||
| 359 | return -ENOMEM; | ||
| 360 | |||
| 361 | priv->reg_base = pcim_iomap_table(pdev)[0]; | ||
| 362 | priv->chip.label = dev_name(&pdev->dev); | ||
| 363 | priv->chip.parent = &pdev->dev; | ||
| 364 | priv->chip.request = intel_gpio_request; | ||
| 365 | priv->chip.direction_input = intel_gpio_direction_input; | ||
| 366 | priv->chip.direction_output = intel_gpio_direction_output; | ||
| 367 | priv->chip.get = intel_gpio_get; | ||
| 368 | priv->chip.set = intel_gpio_set; | ||
| 369 | priv->chip.base = gpio_base; | ||
| 370 | priv->chip.ngpio = ddata->ngpio; | ||
| 371 | priv->chip.can_sleep = false; | ||
| 372 | priv->pdev = pdev; | ||
| 373 | |||
| 374 | spin_lock_init(&priv->lock); | ||
| 375 | |||
| 376 | girq = &priv->chip.irq; | ||
| 377 | girq->chip = &intel_mid_irqchip; | ||
| 378 | girq->init_hw = intel_mid_irq_init_hw; | ||
| 379 | girq->parent_handler = intel_mid_irq_handler; | ||
| 380 | girq->num_parents = 1; | ||
| 381 | girq->parents = devm_kcalloc(&pdev->dev, girq->num_parents, | ||
| 382 | sizeof(*girq->parents), | ||
| 383 | GFP_KERNEL); | ||
| 384 | if (!girq->parents) | ||
| 385 | return -ENOMEM; | ||
| 386 | girq->parents[0] = pdev->irq; | ||
| 387 | girq->first = irq_base; | ||
| 388 | girq->default_type = IRQ_TYPE_NONE; | ||
| 389 | girq->handler = handle_simple_irq; | ||
| 390 | |||
| 391 | pci_set_drvdata(pdev, priv); | ||
| 392 | |||
| 393 | retval = devm_gpiochip_add_data(&pdev->dev, &priv->chip, priv); | ||
| 394 | if (retval) { | ||
| 395 | dev_err(&pdev->dev, "gpiochip_add error %d\n", retval); | ||
| 396 | return retval; | ||
| 397 | } | ||
| 398 | |||
| 399 | pm_runtime_put_noidle(&pdev->dev); | ||
| 400 | pm_runtime_allow(&pdev->dev); | ||
| 401 | |||
| 402 | return 0; | ||
| 403 | } | ||
| 404 | |||
| 405 | static struct pci_driver intel_gpio_driver = { | ||
| 406 | .name = "intel_mid_gpio", | ||
| 407 | .id_table = intel_gpio_ids, | ||
| 408 | .probe = intel_gpio_probe, | ||
| 409 | .driver = { | ||
| 410 | .pm = &intel_gpio_pm_ops, | ||
| 411 | }, | ||
| 412 | }; | ||
| 413 | |||
| 414 | builtin_pci_driver(intel_gpio_driver); | ||
| @@ -1,314 +0,0 @@ | |||
| 1 | // SPDX-License-Identifier: GPL-2.0 | ||
| 2 | /* | ||
| 3 | * Intel Medfield MSIC GPIO driver> | ||
| 4 | * Copyright (c) 2011, Intel Corporation. | ||
| 5 | * | ||
| 6 | * Author: Mathias Nyman <mathias.nyman@linux.intel.com> | ||
| 7 | * Based on intel_pmic_gpio.c | ||
| 8 | */ | ||
| 9 | |||
| 10 | #include <linux/gpio/driver.h> | ||
| 11 | #include <linux/init.h> | ||
| 12 | #include <linux/interrupt.h> | ||
| 13 | #include <linux/kernel.h> | ||
| 14 | #include <linux/mfd/intel_msic.h> | ||
| 15 | #include <linux/platform_device.h> | ||
| 16 | #include <linux/slab.h> | ||
| 17 | |||
| 18 | /* the offset for the mapping of global gpio pin to irq */ | ||
| 19 | #define MSIC_GPIO_IRQ_OFFSET 0x100 | ||
| 20 | |||
| 21 | #define MSIC_GPIO_DIR_IN 0 | ||
| 22 | #define MSIC_GPIO_DIR_OUT BIT(5) | ||
| 23 | #define MSIC_GPIO_TRIG_FALL BIT(1) | ||
| 24 | #define MSIC_GPIO_TRIG_RISE BIT(2) | ||
| 25 | |||
| 26 | /* masks for msic gpio output GPIOxxxxCTLO registers */ | ||
| 27 | #define MSIC_GPIO_DIR_MASK BIT(5) | ||
| 28 | #define MSIC_GPIO_DRV_MASK BIT(4) | ||
| 29 | #define MSIC_GPIO_REN_MASK BIT(3) | ||
| 30 | #define MSIC_GPIO_RVAL_MASK (BIT(2) | BIT(1)) | ||
| 31 | #define MSIC_GPIO_DOUT_MASK BIT(0) | ||
| 32 | |||
| 33 | /* masks for msic gpio input GPIOxxxxCTLI registers */ | ||
| 34 | #define MSIC_GPIO_GLBYP_MASK BIT(5) | ||
| 35 | #define MSIC_GPIO_DBNC_MASK (BIT(4) | BIT(3)) | ||
| 36 | #define MSIC_GPIO_INTCNT_MASK (BIT(2) | BIT(1)) | ||
| 37 | #define MSIC_GPIO_DIN_MASK BIT(0) | ||
| 38 | |||
| 39 | #define MSIC_NUM_GPIO 24 | ||
| 40 | |||
| 41 | struct msic_gpio { | ||
| 42 | struct platform_device *pdev; | ||
| 43 | struct mutex buslock; | ||
| 44 | struct gpio_chip chip; | ||
| 45 | int irq; | ||
| 46 | unsigned irq_base; | ||
| 47 | unsigned long trig_change_mask; | ||
| 48 | unsigned trig_type; | ||
| 49 | }; | ||
| 50 | |||
| 51 | /* | ||
| 52 | * MSIC has 24 gpios, 16 low voltage (1.2-1.8v) and 8 high voltage (3v). | ||
| 53 | * Both the high and low voltage gpios are divided in two banks. | ||
| 54 | * GPIOs are numbered with GPIO0LV0 as gpio_base in the following order: | ||
| 55 | * GPIO0LV0..GPIO0LV7: low voltage, bank 0, gpio_base | ||
| 56 | * GPIO1LV0..GPIO1LV7: low voltage, bank 1, gpio_base + 8 | ||
| 57 | * GPIO0HV0..GPIO0HV3: high voltage, bank 0, gpio_base + 16 | ||
| 58 | * GPIO1HV0..GPIO1HV3: high voltage, bank 1, gpio_base + 20 | ||
| 59 | */ | ||
| 60 | |||
| 61 | static int msic_gpio_to_ireg(unsigned offset) | ||
| 62 | { | ||
| 63 | if (offset >= MSIC_NUM_GPIO) | ||
| 64 | return -EINVAL; | ||
| 65 | |||
| 66 | if (offset < 8) | ||
| 67 | return INTEL_MSIC_GPIO0LV0CTLI - offset; | ||
| 68 | if (offset < 16) | ||
| 69 | return INTEL_MSIC_GPIO1LV0CTLI - offset + 8; | ||
| 70 | if (offset < 20) | ||
| 71 | return INTEL_MSIC_GPIO0HV0CTLI - offset + 16; | ||
| 72 | |||
| 73 | return INTEL_MSIC_GPIO1HV0CTLI - offset + 20; | ||
| 74 | } | ||
| 75 | |||
| 76 | static int msic_gpio_to_oreg(unsigned offset) | ||
| 77 | { | ||
| 78 | if (offset >= MSIC_NUM_GPIO) | ||
| 79 | return -EINVAL; | ||
| 80 | |||
| 81 | if (offset < 8) | ||
| 82 | return INTEL_MSIC_GPIO0LV0CTLO - offset; | ||
| 83 | if (offset < 16) | ||
| 84 | return INTEL_MSIC_GPIO1LV0CTLO - offset + 8; | ||
| 85 | if (offset < 20) | ||
| 86 | return INTEL_MSIC_GPIO0HV0CTLO - offset + 16; | ||
| 87 | |||
| 88 | return INTEL_MSIC_GPIO1HV0CTLO - offset + 20; | ||
| 89 | } | ||
| 90 | |||
| 91 | static int msic_gpio_direction_input(struct gpio_chip *chip, unsigned offset) | ||
| 92 | { | ||
| 93 | int reg; | ||
| 94 | |||
| 95 | reg = msic_gpio_to_oreg(offset); | ||
| 96 | if (reg < 0) | ||
| 97 | return reg; | ||
| 98 | |||
| 99 | return intel_msic_reg_update(reg, MSIC_GPIO_DIR_IN, MSIC_GPIO_DIR_MASK); | ||
| 100 | } | ||
| 101 | |||
| 102 | static int msic_gpio_direction_output(struct gpio_chip *chip, | ||
| 103 | unsigned offset, int value) | ||
| 104 | { | ||
| 105 | int reg; | ||
| 106 | unsigned mask; | ||
| 107 | |||
| 108 | value = (!!value) | MSIC_GPIO_DIR_OUT; | ||
| 109 | mask = MSIC_GPIO_DIR_MASK | MSIC_GPIO_DOUT_MASK; | ||
| 110 | |||
| 111 | reg = msic_gpio_to_oreg(offset); | ||
| 112 | if (reg < 0) | ||
| 113 | return reg; | ||
| 114 | |||
| 115 | return intel_msic_reg_update(reg, value, mask); | ||
| 116 | } | ||
| 117 | |||
| 118 | static int msic_gpio_get(struct gpio_chip *chip, unsigned offset) | ||
| 119 | { | ||
| 120 | u8 r; | ||
| 121 | int ret; | ||
| 122 | int reg; | ||
| 123 | |||
| 124 | reg = msic_gpio_to_ireg(offset); | ||
| 125 | if (reg < 0) | ||
| 126 | return reg; | ||
| 127 | |||
| 128 | ret = intel_msic_reg_read(reg, &r); | ||
| 129 | if (ret < 0) | ||
| 130 | return ret; | ||
| 131 | |||
| 132 | return !!(r & MSIC_GPIO_DIN_MASK); | ||
| 133 | } | ||
| 134 | |||
| 135 | static void msic_gpio_set(struct gpio_chip *chip, unsigned offset, int value) | ||
| 136 | { | ||
| 137 | int reg; | ||
| 138 | |||
| 139 | reg = msic_gpio_to_oreg(offset); | ||
| 140 | if (reg < 0) | ||
| 141 | return; | ||
| 142 | |||
| 143 | intel_msic_reg_update(reg, !!value , MSIC_GPIO_DOUT_MASK); | ||
| 144 | } | ||
| 145 | |||
| 146 | /* | ||
| 147 | * This is called from genirq with mg->buslock locked and | ||
| 148 | * irq_desc->lock held. We can not access the scu bus here, so we | ||
| 149 | * store the change and update in the bus_sync_unlock() function below | ||
| 150 | */ | ||
| 151 | static int msic_irq_type(struct irq_data *data, unsigned type) | ||
| 152 | { | ||
| 153 | struct msic_gpio *mg = irq_data_get_irq_chip_data(data); | ||
| 154 | u32 gpio = data->irq - mg->irq_base; | ||
| 155 | |||
| 156 | if (gpio >= mg->chip.ngpio) | ||
| 157 | return -EINVAL; | ||
| 158 | |||
| 159 | /* mark for which gpio the trigger changed, protected by buslock */ | ||
| 160 | mg->trig_change_mask |= (1 << gpio); | ||
| 161 | mg->trig_type = type; | ||
| 162 | |||
| 163 | return 0; | ||
| 164 | } | ||
| 165 | |||
| 166 | static int msic_gpio_to_irq(struct gpio_chip *chip, unsigned offset) | ||
| 167 | { | ||
| 168 | struct msic_gpio *mg = gpiochip_get_data(chip); | ||
| 169 | return mg->irq_base + offset; | ||
| 170 | } | ||
| 171 | |||
| 172 | static void msic_bus_lock(struct irq_data *data) | ||
| 173 | { | ||
| 174 | struct msic_gpio *mg = irq_data_get_irq_chip_data(data); | ||
| 175 | mutex_lock(&mg->buslock); | ||
| 176 | } | ||
| 177 | |||
| 178 | static void msic_bus_sync_unlock(struct irq_data *data) | ||
| 179 | { | ||
| 180 | struct msic_gpio *mg = irq_data_get_irq_chip_data(data); | ||
| 181 | int offset; | ||
| 182 | int reg; | ||
| 183 | u8 trig = 0; | ||
| 184 | |||
| 185 | /* We can only get one change at a time as the buslock covers the | ||
| 186 | entire transaction. The irq_desc->lock is dropped before we are | ||
| 187 | called but that is fine */ | ||
| 188 | if (mg->trig_change_mask) { | ||
| 189 | offset = __ffs(mg->trig_change_mask); | ||
| 190 | |||
| 191 | reg = msic_gpio_to_ireg(offset); | ||
| 192 | if (reg < 0) | ||
| 193 | goto out; | ||
| 194 | |||
| 195 | if (mg->trig_type & IRQ_TYPE_EDGE_RISING) | ||
| 196 | trig |= MSIC_GPIO_TRIG_RISE; | ||
| 197 | if (mg->trig_type & IRQ_TYPE_EDGE_FALLING) | ||
| 198 | trig |= MSIC_GPIO_TRIG_FALL; | ||
| 199 | |||
| 200 | intel_msic_reg_update(reg, trig, MSIC_GPIO_INTCNT_MASK); | ||
| 201 | mg->trig_change_mask = 0; | ||
| 202 | } | ||
| 203 | out: | ||
| 204 | mutex_unlock(&mg->buslock); | ||
| 205 | } | ||
| 206 | |||
| 207 | /* Firmware does all the masking and unmasking for us, no masking here. */ | ||
| 208 | static void msic_irq_unmask(struct irq_data *data) { } | ||
| 209 | |||
| 210 | static void msic_irq_mask(struct irq_data *data) { } | ||
| 211 | |||
| 212 | static struct irq_chip msic_irqchip = { | ||
| 213 | .name = "MSIC-GPIO", | ||
| 214 | .irq_mask = msic_irq_mask, | ||
| 215 | .irq_unmask = msic_irq_unmask, | ||
| 216 | .irq_set_type = msic_irq_type, | ||
| 217 | .irq_bus_lock = msic_bus_lock, | ||
| 218 | .irq_bus_sync_unlock = msic_bus_sync_unlock, | ||
| 219 | }; | ||
| 220 | |||
| 221 | static void msic_gpio_irq_handler(struct irq_desc *desc) | ||
| 222 | { | ||
| 223 | struct irq_data *data = irq_desc_get_irq_data(desc); | ||
| 224 | struct msic_gpio *mg = irq_data_get_irq_handler_data(data); | ||
| 225 | struct irq_chip *chip = irq_data_get_irq_chip(data); | ||
| 226 | struct intel_msic *msic = pdev_to_intel_msic(mg->pdev); | ||
| 227 | unsigned long pending; | ||
| 228 | int i; | ||
| 229 | int bitnr; | ||
| 230 | u8 pin; | ||
| 231 | |||
| 232 | for (i = 0; i < (mg->chip.ngpio / BITS_PER_BYTE); i++) { | ||
| 233 | intel_msic_irq_read(msic, INTEL_MSIC_GPIO0LVIRQ + i, &pin); | ||
| 234 | pending = pin; | ||
| 235 | |||
| 236 | for_each_set_bit(bitnr, &pending, BITS_PER_BYTE) | ||
| 237 | generic_handle_irq(mg->irq_base + i * BITS_PER_BYTE + bitnr); | ||
| 238 | } | ||
| 239 | chip->irq_eoi(data); | ||
| 240 | } | ||
| 241 | |||
| 242 | static int platform_msic_gpio_probe(struct platform_device *pdev) | ||
| 243 | { | ||
| 244 | struct device *dev = &pdev->dev; | ||
| 245 | struct intel_msic_gpio_pdata *pdata = dev_get_platdata(dev); | ||
| 246 | struct msic_gpio *mg; | ||
| 247 | int irq = platform_get_irq(pdev, 0); | ||
| 248 | int retval; | ||
| 249 | int i; | ||
| 250 | |||
| 251 | if (irq < 0) { | ||
| 252 | dev_err(dev, "no IRQ line: %d\n", irq); | ||
| 253 | return irq; | ||
| 254 | } | ||
| 255 | |||
| 256 | if (!pdata || !pdata->gpio_base) { | ||
| 257 | dev_err(dev, "incorrect or missing platform data\n"); | ||
| 258 | return -EINVAL; | ||
| 259 | } | ||
| 260 | |||
| 261 | mg = kzalloc(sizeof(*mg), GFP_KERNEL); | ||
| 262 | if (!mg) | ||
| 263 | return -ENOMEM; | ||
| 264 | |||
| 265 | dev_set_drvdata(dev, mg); | ||
| 266 | |||
| 267 | mg->pdev = pdev; | ||
| 268 | mg->irq = irq; | ||
| 269 | mg->irq_base = pdata->gpio_base + MSIC_GPIO_IRQ_OFFSET; | ||
| 270 | mg->chip.label = "msic_gpio"; | ||
| 271 | mg->chip.direction_input = msic_gpio_direction_input; | ||
| 272 | mg->chip.direction_output = msic_gpio_direction_output; | ||
| 273 | mg->chip.get = msic_gpio_get; | ||
| 274 | mg->chip.set = msic_gpio_set; | ||
| 275 | mg->chip.to_irq = msic_gpio_to_irq; | ||
| 276 | mg->chip.base = pdata->gpio_base; | ||
| 277 | mg->chip.ngpio = MSIC_NUM_GPIO; | ||
| 278 | mg->chip.can_sleep = true; | ||
| 279 | mg->chip.parent = dev; | ||
| 280 | |||
| 281 | mutex_init(&mg->buslock); | ||
| 282 | |||
| 283 | retval = gpiochip_add_data(&mg->chip, mg); | ||
| 284 | if (retval) { | ||
| 285 | dev_err(dev, "Adding MSIC gpio chip failed\n"); | ||
| 286 | goto err; | ||
| 287 | } | ||
| 288 | |||
| 289 | for (i = 0; i < mg->chip.ngpio; i++) { | ||
| 290 | irq_set_chip_data(i + mg->irq_base, mg); | ||
| 291 | irq_set_chip_and_handler(i + mg->irq_base, | ||
| 292 | &msic_irqchip, | ||
| 293 | handle_simple_irq); | ||
| 294 | } | ||
| 295 | irq_set_chained_handler_and_data(mg->irq, msic_gpio_irq_handler, mg); | ||
| 296 | |||
| 297 | return 0; | ||
| 298 | err: | ||
| 299 | kfree(mg); | ||
| 300 | return retval; | ||
| 301 | } | ||
| 302 | |||
| 303 | static struct platform_driver platform_msic_gpio_driver = { | ||
| 304 | .driver = { | ||
| 305 | .name = "msic_gpio", | ||
| 306 | }, | ||
| 307 | .probe = platform_msic_gpio_probe, | ||
| 308 | }; | ||
| 309 | |||
| 310 | static int __init platform_msic_gpio_init(void) | ||
| 311 | { | ||
| 312 | return platform_driver_register(&platform_msic_gpio_driver); | ||
| 313 | } | ||
| 314 | subsys_initcall(platform_msic_gpio_init); | ||
| @@ -10,9 +10,6 @@ · 9 unmodified lines | |||
| 10 | #include <linux/dmi.h> | 10 | #include <linux/dmi.h> |
| 11 | #include <linux/module.h> | 11 | #include <linux/module.h> |
| 12 | 12 | ||
| 13 | #include <asm/intel-mid.h> | ||
| 14 | #include <asm/intel_scu_ipc.h> | ||
| 15 | |||
| 16 | #include <drm/drm.h> | 13 | #include <drm/drm.h> |
| 17 | 14 | ||
| 18 | #include "intel_bios.h" | 15 | #include "intel_bios.h" |
| @@ -386,6 +386,8 @@ struct psb_ops; · 385 unmodified lines | |||
| 386 | 386 | ||
| 387 | #define PSB_NUM_PIPE 3 | 387 | #define PSB_NUM_PIPE 3 |
| 388 | 388 | ||
| 389 | struct intel_scu_ipc_dev; | ||
| 390 | |||
| 389 | struct drm_psb_private { | 391 | struct drm_psb_private { |
| 390 | struct drm_device *dev; | 392 | struct drm_device *dev; |
| 391 | struct pci_dev *aux_pdev; /* Currently only used by mrst */ | 393 | struct pci_dev *aux_pdev; /* Currently only used by mrst */ |
| @@ -525,6 +527,7 @@ struct drm_psb_private { · 133 unmodified lines | |||
| 525 | * Used for modifying backlight from | 527 | * Used for modifying backlight from |
| 526 | * xrandr -- consider removing and using HAL instead | 528 | * xrandr -- consider removing and using HAL instead |
| 527 | */ | 529 | */ |
| 530 | struct intel_scu_ipc_dev *scu; | ||
| 528 | struct backlight_device *backlight_device; | 531 | struct backlight_device *backlight_device; |
| 529 | struct drm_property *backlight_property; | 532 | struct drm_property *backlight_property; |
| 530 | bool backlight_enabled; | 533 | bool backlight_enabled; |
| @@ -37,7 +37,6 @@ struct olpc_ec_priv { · 36 unmodified lines | |||
| 37 | struct mutex cmd_lock; | 37 | struct mutex cmd_lock; |
| 38 | 38 | ||
| 39 | /* DCON regulator */ | 39 | /* DCON regulator */ |
| 40 | struct regulator_dev *dcon_rdev; | ||
| 41 | bool dcon_enabled; | 40 | bool dcon_enabled; |
| 42 | 41 | ||
| 43 | /* Pending EC commands */ | 42 | /* Pending EC commands */ |
| @@ -387,24 +386,26 @@ static int dcon_regulator_is_enabled(struct regulator_dev *rdev) · 343 unmodified lines | |||
| 387 | return ec->dcon_enabled ? 1 : 0; | 386 | return ec->dcon_enabled ? 1 : 0; |
| 388 | } | 387 | } |
| 389 | 388 | ||
| 390 | static struct regulator_ops dcon_regulator_ops = { | 389 | static const struct regulator_ops dcon_regulator_ops = { |
| 391 | .enable = dcon_regulator_enable, | 390 | .enable = dcon_regulator_enable, |
| 392 | .disable = dcon_regulator_disable, | 391 | .disable = dcon_regulator_disable, |
| 393 | .is_enabled = dcon_regulator_is_enabled, | 392 | .is_enabled = dcon_regulator_is_enabled, |
| 394 | }; | 393 | }; |
| 395 | 394 | ||
| 396 | static const struct regulator_desc dcon_desc = { | 395 | static const struct regulator_desc dcon_desc = { |
| 397 | .name = "dcon", | 396 | .name = "dcon", |
| 398 | .id = 0, | 397 | .id = 0, |
| 399 | .ops = &dcon_regulator_ops, | 398 | .ops = &dcon_regulator_ops, |
| 400 | .type = REGULATOR_VOLTAGE, | 399 | .type = REGULATOR_VOLTAGE, |
| 401 | .owner = THIS_MODULE, | 400 | .owner = THIS_MODULE, |
| 401 | .enable_time = 25000, | ||
| 402 | }; | 402 | }; |
| 403 | 403 | ||
| 404 | static int olpc_ec_probe(struct platform_device *pdev) | 404 | static int olpc_ec_probe(struct platform_device *pdev) |
| 405 | { | 405 | { |
| 406 | struct olpc_ec_priv *ec; | 406 | struct olpc_ec_priv *ec; |
| 407 | struct regulator_config config = { }; | 407 | struct regulator_config config = { }; |
| 408 | struct regulator_dev *regulator; | ||
| 408 | int err; | 409 | int err; |
| 409 | 410 | ||
| 410 | if (!ec_driver) | 411 | if (!ec_driver) |
| @@ -426,26 +427,26 @@ static int olpc_ec_probe(struct platform_device *pdev) · 15 unmodified lines | |||
| 426 | 427 | ||
| 427 | /* get the EC revision */ | 428 | /* get the EC revision */ |
| 428 | err = olpc_ec_cmd(EC_FIRMWARE_REV, NULL, 0, &ec->version, 1); | 429 | err = olpc_ec_cmd(EC_FIRMWARE_REV, NULL, 0, &ec->version, 1); |
| 429 | if (err) { | 430 | if (err) |
| 430 | ec_priv = NULL; | 431 | goto error; |
| 431 | kfree(ec); | ||
| 432 | return err; | ||
| 433 | } | ||
| 434 | 432 | ||
| 435 | config.dev = pdev->dev.parent; | 433 | config.dev = pdev->dev.parent; |
| 436 | config.driver_data = ec; | 434 | config.driver_data = ec; |
| 437 | ec->dcon_enabled = true; | 435 | ec->dcon_enabled = true; |
| 438 | ec->dcon_rdev = devm_regulator_register(&pdev->dev, &dcon_desc, | 436 | regulator = devm_regulator_register(&pdev->dev, &dcon_desc, &config); |
| 439 | &config); | 437 | if (IS_ERR(regulator)) { |
| 440 | if (IS_ERR(ec->dcon_rdev)) { | ||
| 441 | dev_err(&pdev->dev, "failed to register DCON regulator\n"); | 438 | dev_err(&pdev->dev, "failed to register DCON regulator\n"); |
| 442 | err = PTR_ERR(ec->dcon_rdev); | 439 | err = PTR_ERR(regulator); |
| 443 | kfree(ec); | 440 | goto error; |
| 444 | return err; | ||
| 445 | } | 441 | } |
| 446 | 442 | ||
| 447 | ec->dbgfs_dir = olpc_ec_setup_debugfs(); | 443 | ec->dbgfs_dir = olpc_ec_setup_debugfs(); |
| 448 | 444 | ||
| 445 | return 0; | ||
| 446 | |||
| 447 | error: | ||
| 448 | ec_priv = NULL; | ||
| 449 | kfree(ec); | ||
| 449 | return err; | 450 | return err; |
| 450 | } | 451 | } |
| 451 | 452 | ||
| @@ -41,6 +41,42 @@ config SURFACE_3_POWER_OPREGION · 40 unmodified lines | |||
| 41 | This driver provides support for ACPI operation | 41 | This driver provides support for ACPI operation |
| 42 | region of the Surface 3 battery platform driver. | 42 | region of the Surface 3 battery platform driver. |
| 43 | 43 | ||
| 44 | config SURFACE_ACPI_NOTIFY | ||
| 45 | tristate "Surface ACPI Notify Driver" | ||
| 46 | depends on SURFACE_AGGREGATOR | ||
| 47 | help | ||
| 48 | Surface ACPI Notify (SAN) driver for Microsoft Surface devices. | ||
| 49 | |||
| 50 | This driver provides support for the ACPI interface (called SAN) of | ||
| 51 | the Surface System Aggregator Module (SSAM) EC. This interface is used | ||
| 52 | on 5th- and 6th-generation Microsoft Surface devices (including | ||
| 53 | Surface Pro 5 and 6, Surface Book 2, Surface Laptops 1 and 2, and in | ||
| 54 | reduced functionality on the Surface Laptop 3) to execute SSAM | ||
| 55 | requests directly from ACPI code, as well as receive SSAM events and | ||
| 56 | turn them into ACPI notifications. It essentially acts as a | ||
| 57 | translation layer between the SSAM controller and ACPI. | ||
| 58 | |||
| 59 | Specifically, this driver may be needed for battery status reporting, | ||
| 60 | thermal sensor access, and real-time clock information, depending on | ||
| 61 | the Surface device in question. | ||
| 62 | |||
| 63 | config SURFACE_AGGREGATOR_CDEV | ||
| 64 | tristate "Surface System Aggregator Module User-Space Interface" | ||
| 65 | depends on SURFACE_AGGREGATOR | ||
| 66 | help | ||
| 67 | Provides a misc-device interface to the Surface System Aggregator | ||
| 68 | Module (SSAM) controller. | ||
| 69 | |||
| 70 | This option provides a module (called surface_aggregator_cdev), that, | ||
| 71 | when loaded, will add a client device (and its respective driver) to | ||
| 72 | the SSAM controller. Said client device manages a misc-device | ||
| 73 | interface (/dev/surface/aggregator), which can be used by user-space | ||
| 74 | tools to directly communicate with the SSAM EC by sending requests and | ||
| 75 | receiving the corresponding responses. | ||
| 76 | |||
| 77 | The provided interface is intended for debugging and development only, | ||
| 78 | and should not be used otherwise. | ||
| 79 | |||
| 44 | config SURFACE_GPE | 80 | config SURFACE_GPE |
| 45 | tristate "Surface GPE/Lid Support Driver" | 81 | tristate "Surface GPE/Lid Support Driver" |
| 46 | depends on DMI | 82 | depends on DMI |
| @@ -50,10 +86,31 @@ config SURFACE_GPE · 3 unmodified lines | |||
| 50 | accordingly. It is required on those devices to allow wake-ups from | 86 | accordingly. It is required on those devices to allow wake-ups from |
| 51 | suspend by opening the lid. | 87 | suspend by opening the lid. |
| 52 | 88 | ||
| 89 | config SURFACE_HOTPLUG | ||
| 90 | tristate "Surface Hot-Plug Driver" | ||
| 91 | depends on GPIOLIB | ||
| 92 | help | ||
| 93 | Driver for out-of-band hot-plug event signaling on Microsoft Surface | ||
| 94 | devices with hot-pluggable PCIe cards. | ||
| 95 | |||
| 96 | This driver is used on Surface Book (2 and 3) devices with a | ||
| 97 | hot-pluggable discrete GPU (dGPU). When not in use, the dGPU on those | ||
| 98 | devices can enter D3cold, which prevents in-band (standard) PCIe | ||
| 99 | hot-plug signaling. Thus, without this driver, detaching the base | ||
| 100 | containing the dGPU will not correctly update the state of the | ||
| 101 | corresponding PCIe device if it is in D3cold. This driver adds support | ||
| 102 | for out-of-band hot-plug notifications, ensuring that the device state | ||
| 103 | is properly updated even when the device in question is in D3cold. | ||
| 104 | |||
| 105 | Select M or Y here, if you want to (fully) support hot-plugging of | ||
| 106 | dGPU devices on the Surface Book 2 and/or 3 during D3cold. | ||
| 107 | |||
| 53 | config SURFACE_PRO3_BUTTON | 108 | config SURFACE_PRO3_BUTTON |
| 54 | tristate "Power/home/volume buttons driver for Microsoft Surface Pro 3/4 tablet" | 109 | tristate "Power/home/volume buttons driver for Microsoft Surface Pro 3/4 tablet" |
| 55 | depends on INPUT | 110 | depends on INPUT |
| 56 | help | 111 | help |
| 57 | This driver handles the power/home/volume buttons on the Microsoft Surface Pro 3/4 tablet. | 112 | This driver handles the power/home/volume buttons on the Microsoft Surface Pro 3/4 tablet. |
| 58 | 113 | ||
| 114 | source "drivers/platform/surface/aggregator/Kconfig" | ||
| 115 | |||
| 59 | endif # SURFACE_PLATFORMS | 116 | endif # SURFACE_PLATFORMS |
| @@ -7,5 +7,9 @@ · 6 unmodified lines | |||
| 7 | obj-$(CONFIG_SURFACE3_WMI) += surface3-wmi.o | 7 | obj-$(CONFIG_SURFACE3_WMI) += surface3-wmi.o |
| 8 | obj-$(CONFIG_SURFACE_3_BUTTON) += surface3_button.o | 8 | obj-$(CONFIG_SURFACE_3_BUTTON) += surface3_button.o |
| 9 | obj-$(CONFIG_SURFACE_3_POWER_OPREGION) += surface3_power.o | 9 | obj-$(CONFIG_SURFACE_3_POWER_OPREGION) += surface3_power.o |
| 10 | obj-$(CONFIG_SURFACE_ACPI_NOTIFY) += surface_acpi_notify.o | ||
| 11 | obj-$(CONFIG_SURFACE_AGGREGATOR) += aggregator/ | ||
| 12 | obj-$(CONFIG_SURFACE_AGGREGATOR_CDEV) += surface_aggregator_cdev.o | ||
| 10 | obj-$(CONFIG_SURFACE_GPE) += surface_gpe.o | 13 | obj-$(CONFIG_SURFACE_GPE) += surface_gpe.o |
| 14 | obj-$(CONFIG_SURFACE_HOTPLUG) += surface_hotplug.o | ||
| 11 | obj-$(CONFIG_SURFACE_PRO3_BUTTON) += surfacepro3_button.o | 15 | obj-$(CONFIG_SURFACE_PRO3_BUTTON) += surfacepro3_button.o |
| @@ -0,0 +1,68 @@ | |||
| 1 | # SPDX-License-Identifier: GPL-2.0+ | ||
| 2 | # Copyright (C) 2019-2020 Maximilian Luz <luzmaximilian@gmail.com> | ||
| 3 | |||
| 4 | menuconfig SURFACE_AGGREGATOR | ||
| 5 | tristate "Microsoft Surface System Aggregator Module Subsystem and Drivers" | ||
| 6 | depends on SERIAL_DEV_BUS | ||
| 7 | select CRC_CCITT | ||
| 8 | help | ||
| 9 | The Surface System Aggregator Module (Surface SAM or SSAM) is an | ||
| 10 | embedded controller (EC) found on 5th- and later-generation Microsoft | ||
| 11 | Surface devices (i.e. Surface Pro 5, Surface Book 2, Surface Laptop, | ||
| 12 | and newer, with exception of Surface Go series devices). | ||
| 13 | |||
| 14 | Depending on the device in question, this EC provides varying | ||
| 15 | functionality, including: | ||
| 16 | - EC access from ACPI via Surface ACPI Notify (5th- and 6th-generation) | ||
| 17 | - battery status information (all devices) | ||
| 18 | - thermal sensor access (all devices) | ||
| 19 | - performance mode / cooling mode control (all devices) | ||
| 20 | - clipboard detachment system control (Surface Book 2 and 3) | ||
| 21 | - HID / keyboard input (Surface Laptops, Surface Book 3) | ||
| 22 | |||
| 23 | This option controls whether the Surface SAM subsystem core will be | ||
| 24 | built. This includes a driver for the Surface Serial Hub (SSH), which | ||
| 25 | is the device responsible for the communication with the EC, and a | ||
| 26 | basic kernel interface exposing the EC functionality to other client | ||
| 27 | drivers, i.e. allowing them to make requests to the EC and receive | ||
| 28 | events from it. Selecting this option alone will not provide any | ||
| 29 | client drivers and therefore no functionality beyond the in-kernel | ||
| 30 | interface. Said functionality is the responsibility of the respective | ||
| 31 | client drivers. | ||
| 32 | |||
| 33 | Note: While 4th-generation Surface devices also make use of a SAM EC, | ||
| 34 | due to a difference in the communication interface of the controller, | ||
| 35 | only 5th and later generations are currently supported. Specifically, | ||
| 36 | devices using SAM-over-SSH are supported, whereas devices using | ||
| 37 | SAM-over-HID, which is used on the 4th generation, are currently not | ||
| 38 | supported. | ||
| 39 | |||
| 40 | Choose m if you want to build the SAM subsystem core and SSH driver as | ||
| 41 | module, y if you want to build it into the kernel and n if you don't | ||
| 42 | want it at all. | ||
| 43 | |||
| 44 | config SURFACE_AGGREGATOR_BUS | ||
| 45 | bool "Surface System Aggregator Module Bus" | ||
| 46 | depends on SURFACE_AGGREGATOR | ||
| 47 | default y | ||
| 48 | help | ||
| 49 | Expands the Surface System Aggregator Module (SSAM) core driver by | ||
| 50 | providing a dedicated bus and client-device type. | ||
| 51 | |||
| 52 | This bus and device type are intended to provide and simplify support | ||
| 53 | for non-platform and non-ACPI SSAM devices, i.e. SSAM devices that are | ||
| 54 | not auto-detectable via the conventional means (e.g. ACPI). | ||
| 55 | |||
| 56 | config SURFACE_AGGREGATOR_ERROR_INJECTION | ||
| 57 | bool "Surface System Aggregator Module Error Injection Capabilities" | ||
| 58 | depends on SURFACE_AGGREGATOR | ||
| 59 | depends on FUNCTION_ERROR_INJECTION | ||
| 60 | help | ||
| 61 | Provides error-injection capabilities for the Surface System | ||
| 62 | Aggregator Module subsystem and Surface Serial Hub driver. | ||
| 63 | |||
| 64 | Specifically, exports error injection hooks to be used with the | ||
| 65 | kernel's function error injection capabilities to simulate underlying | ||
| 66 | transport and communication problems, such as invalid data sent to or | ||
| 67 | received from the EC, dropped data, and communication timeouts. | ||
| 68 | Intended for development and debugging. | ||
| @@ -0,0 +1,17 @@ | |||
| 1 | # SPDX-License-Identifier: GPL-2.0+ | ||
| 2 | # Copyright (C) 2019-2020 Maximilian Luz <luzmaximilian@gmail.com> | ||
| 3 | |||
| 4 | # For include/trace/define_trace.h to include trace.h | ||
| 5 | CFLAGS_core.o = -I$(src) | ||
| 6 | |||
| 7 | obj-$(CONFIG_SURFACE_AGGREGATOR) += surface_aggregator.o | ||
| 8 | |||
| 9 | surface_aggregator-objs := core.o | ||
| 10 | surface_aggregator-objs += ssh_parser.o | ||
| 11 | surface_aggregator-objs += ssh_packet_layer.o | ||
| 12 | surface_aggregator-objs += ssh_request_layer.o | ||
| 13 | surface_aggregator-objs += controller.o | ||
| 14 | |||
| 15 | ifeq ($(CONFIG_SURFACE_AGGREGATOR_BUS),y) | ||
| 16 | surface_aggregator-objs += bus.o | ||
| 17 | endif | ||
| @@ -0,0 +1,415 @@ | |||
| 1 | // SPDX-License-Identifier: GPL-2.0+ | ||
| 2 | /* | ||
| 3 | * Surface System Aggregator Module bus and device integration. | ||
| 4 | * | ||
| 5 | * Copyright (C) 2019-2020 Maximilian Luz <luzmaximilian@gmail.com> | ||
| 6 | */ | ||
| 7 | |||
| 8 | #include <linux/device.h> | ||
| 9 | #include <linux/slab.h> | ||
| 10 | |||
| 11 | #include <linux/surface_aggregator/controller.h> | ||
| 12 | #include <linux/surface_aggregator/device.h> | ||
| 13 | |||
| 14 | #include "bus.h" | ||
| 15 | #include "controller.h" | ||
| 16 | |||
| 17 | static ssize_t modalias_show(struct device *dev, struct device_attribute *attr, | ||
| 18 | char *buf) | ||
| 19 | { | ||
| 20 | struct ssam_device *sdev = to_ssam_device(dev); | ||
| 21 | |||
| 22 | return sysfs_emit(buf, "ssam:d%02Xc%02Xt%02Xi%02Xf%02X\n", | ||
| 23 | sdev->uid.domain, sdev->uid.category, sdev->uid.target, | ||
| 24 | sdev->uid.instance, sdev->uid.function); | ||
| 25 | } | ||
| 26 | static DEVICE_ATTR_RO(modalias); | ||
| 27 | |||
| 28 | static struct attribute *ssam_device_attrs[] = { | ||
| 29 | &dev_attr_modalias.attr, | ||
| 30 | NULL, | ||
| 31 | }; | ||
| 32 | ATTRIBUTE_GROUPS(ssam_device); | ||
| 33 | |||
| 34 | static int ssam_device_uevent(struct device *dev, struct kobj_uevent_env *env) | ||
| 35 | { | ||
| 36 | struct ssam_device *sdev = to_ssam_device(dev); | ||
| 37 | |||
| 38 | return add_uevent_var(env, "MODALIAS=ssam:d%02Xc%02Xt%02Xi%02Xf%02X", | ||
| 39 | sdev->uid.domain, sdev->uid.category, | ||
| 40 | sdev->uid.target, sdev->uid.instance, | ||
| 41 | sdev->uid.function); | ||
| 42 | } | ||
| 43 | |||
| 44 | static void ssam_device_release(struct device *dev) | ||
| 45 | { | ||
| 46 | struct ssam_device *sdev = to_ssam_device(dev); | ||
| 47 | |||
| 48 | ssam_controller_put(sdev->ctrl); | ||
| 49 | kfree(sdev); | ||
| 50 | } | ||
| 51 | |||
| 52 | const struct device_type ssam_device_type = { | ||
| 53 | .name = "surface_aggregator_device", | ||
| 54 | .groups = ssam_device_groups, | ||
| 55 | .uevent = ssam_device_uevent, | ||
| 56 | .release = ssam_device_release, | ||
| 57 | }; | ||
| 58 | EXPORT_SYMBOL_GPL(ssam_device_type); | ||
| 59 | |||
| 60 | /** | ||
| 61 | * ssam_device_alloc() - Allocate and initialize a SSAM client device. | ||
| 62 | * @ctrl: The controller under which the device should be added. | ||
| 63 | * @uid: The UID of the device to be added. | ||
| 64 | * | ||
| 65 | * Allocates and initializes a new client device. The parent of the device | ||
| 66 | * will be set to the controller device and the name will be set based on the | ||
| 67 | * UID. Note that the device still has to be added via ssam_device_add(). | ||
| 68 | * Refer to that function for more details. | ||
| 69 | * | ||
| 70 | * Return: Returns the newly allocated and initialized SSAM client device, or | ||
| 71 | * %NULL if it could not be allocated. | ||
| 72 | */ | ||
| 73 | struct ssam_device *ssam_device_alloc(struct ssam_controller *ctrl, | ||
| 74 | struct ssam_device_uid uid) | ||
| 75 | { | ||
| 76 | struct ssam_device *sdev; | ||
| 77 | |||
| 78 | sdev = kzalloc(sizeof(*sdev), GFP_KERNEL); | ||
| 79 | if (!sdev) | ||
| 80 | return NULL; | ||
| 81 | |||
| 82 | device_initialize(&sdev->dev); | ||
| 83 | sdev->dev.bus = &ssam_bus_type; | ||
| 84 | sdev->dev.type = &ssam_device_type; | ||
| 85 | sdev->dev.parent = ssam_controller_device(ctrl); | ||
| 86 | sdev->ctrl = ssam_controller_get(ctrl); | ||
| 87 | sdev->uid = uid; | ||
| 88 | |||
| 89 | dev_set_name(&sdev->dev, "%02x:%02x:%02x:%02x:%02x", | ||
| 90 | sdev->uid.domain, sdev->uid.category, sdev->uid.target, | ||
| 91 | sdev->uid.instance, sdev->uid.function); | ||
| 92 | |||
| 93 | return sdev; | ||
| 94 | } | ||
| 95 | EXPORT_SYMBOL_GPL(ssam_device_alloc); | ||
| 96 | |||
| 97 | /** | ||
| 98 | * ssam_device_add() - Add a SSAM client device. | ||
| 99 | * @sdev: The SSAM client device to be added. | ||
| 100 | * | ||
| 101 | * Added client devices must be guaranteed to always have a valid and active | ||
| 102 | * controller. Thus, this function will fail with %-ENODEV if the controller | ||
| 103 | * of the device has not been initialized yet, has been suspended, or has been | ||
| 104 | * shut down. | ||
| 105 | * | ||
| 106 | * The caller of this function should ensure that the corresponding call to | ||
| 107 | * ssam_device_remove() is issued before the controller is shut down. If the | ||
| 108 | * added device is a direct child of the controller device (default), it will | ||
| 109 | * be automatically removed when the controller is shut down. | ||
| 110 | * | ||
| 111 | * By default, the controller device will become the parent of the newly | ||
| 112 | * created client device. The parent may be changed before ssam_device_add is | ||
| 113 | * called, but care must be taken that a) the correct suspend/resume ordering | ||
| 114 | * is guaranteed and b) the client device does not outlive the controller, | ||
| 115 | * i.e. that the device is removed before the controller is being shut down. | ||
| 116 | * In case these guarantees have to be manually enforced, please refer to the | ||
| 117 | * ssam_client_link() and ssam_client_bind() functions, which are intended to | ||
| 118 | * set up device-links for this purpose. | ||
| 119 | * | ||
| 120 | * Return: Returns zero on success, a negative error code on failure. | ||
| 121 | */ | ||
| 122 | int ssam_device_add(struct ssam_device *sdev) | ||
| 123 | { | ||
| 124 | int status; | ||
| 125 | |||
| 126 | /* | ||
| 127 | * Ensure that we can only add new devices to a controller if it has | ||
| 128 | * been started and is not going away soon. This works in combination | ||
| 129 | * with ssam_controller_remove_clients to ensure driver presence for the | ||
| 130 | * controller device, i.e. it ensures that the controller (sdev->ctrl) | ||
| 131 | * is always valid and can be used for requests as long as the client | ||
| 132 | * device we add here is registered as child under it. This essentially | ||
| 133 | * guarantees that the client driver can always expect the preconditions | ||
| 134 | * for functions like ssam_request_sync (controller has to be started | ||
| 135 | * and is not suspended) to hold and thus does not have to check for | ||
| 136 | * them. | ||
| 137 | * | ||
| 138 | * Note that for this to work, the controller has to be a parent device. | ||
| 139 | * If it is not a direct parent, care has to be taken that the device is | ||
| 140 | * removed via ssam_device_remove(), as device_unregister does not | ||
| 141 | * remove child devices recursively. | ||
| 142 | */ | ||
| 143 | ssam_controller_statelock(sdev->ctrl); | ||
| 144 | |||
| 145 | if (sdev->ctrl->state != SSAM_CONTROLLER_STARTED) { | ||
| 146 | ssam_controller_stateunlock(sdev->ctrl); | ||
| 147 | return -ENODEV; | ||
| 148 | } | ||
| 149 | |||
| 150 | status = device_add(&sdev->dev); | ||
| 151 | |||
| 152 | ssam_controller_stateunlock(sdev->ctrl); | ||
| 153 | return status; | ||
| 154 | } | ||
| 155 | EXPORT_SYMBOL_GPL(ssam_device_add); | ||
| 156 | |||
| 157 | /** | ||
| 158 | * ssam_device_remove() - Remove a SSAM client device. | ||
| 159 | * @sdev: The device to remove. | ||
| 160 | * | ||
| 161 | * Removes and unregisters the provided SSAM client device. | ||
| 162 | */ | ||
| 163 | void ssam_device_remove(struct ssam_device *sdev) | ||
| 164 | { | ||
| 165 | device_unregister(&sdev->dev); | ||
| 166 | } | ||
| 167 | EXPORT_SYMBOL_GPL(ssam_device_remove); | ||
| 168 | |||
| 169 | /** | ||
| 170 | * ssam_device_id_compatible() - Check if a device ID matches a UID. | ||
| 171 | * @id: The device ID as potential match. | ||
| 172 | * @uid: The device UID matching against. | ||
| 173 | * | ||
| 174 | * Check if the given ID is a match for the given UID, i.e. if a device with | ||
| 175 | * the provided UID is compatible to the given ID following the match rules | ||
| 176 | * described in its &ssam_device_id.match_flags member. | ||
| 177 | * | ||
| 178 | * Return: Returns %true if the given UID is compatible to the match rule | ||
| 179 | * described by the given ID, %false otherwise. | ||
| 180 | */ | ||
| 181 | static bool ssam_device_id_compatible(const struct ssam_device_id *id, | ||
| 182 | struct ssam_device_uid uid) | ||
| 183 | { | ||
| 184 | if (id->domain != uid.domain || id->category != uid.category) | ||
| 185 | return false; | ||
| 186 | |||
| 187 | if ((id->match_flags & SSAM_MATCH_TARGET) && id->target != uid.target) | ||
| 188 | return false; | ||
| 189 | |||
| 190 | if ((id->match_flags & SSAM_MATCH_INSTANCE) && id->instance != uid.instance) | ||
| 191 | return false; | ||
| 192 | |||
| 193 | if ((id->match_flags & SSAM_MATCH_FUNCTION) && id->function != uid.function) | ||
| 194 | return false; | ||
| 195 | |||
| 196 | return true; | ||
| 197 | } | ||
| 198 | |||
| 199 | /** | ||
| 200 | * ssam_device_id_is_null() - Check if a device ID is null. | ||
| 201 | * @id: The device ID to check. | ||
| 202 | * | ||
| 203 | * Check if a given device ID is null, i.e. all zeros. Used to check for the | ||
| 204 | * end of ``MODULE_DEVICE_TABLE(ssam, ...)`` or similar lists. | ||
| 205 | * | ||
| 206 | * Return: Returns %true if the given ID represents a null ID, %false | ||
| 207 | * otherwise. | ||
| 208 | */ | ||
| 209 | static bool ssam_device_id_is_null(const struct ssam_device_id *id) | ||
| 210 | { | ||
| 211 | return id->match_flags == 0 && | ||
| 212 | id->domain == 0 && | ||
| 213 | id->category == 0 && | ||
| 214 | id->target == 0 && | ||
| 215 | id->instance == 0 && | ||
| 216 | id->function == 0 && | ||
| 217 | id->driver_data == 0; | ||
| 218 | } | ||
| 219 | |||
| 220 | /** | ||
| 221 | * ssam_device_id_match() - Find the matching ID table entry for the given UID. | ||
| 222 | * @table: The table to search in. | ||
| 223 | * @uid: The UID to matched against the individual table entries. | ||
| 224 | * | ||
| 225 | * Find the first match for the provided device UID in the provided ID table | ||
| 226 | * and return it. Returns %NULL if no match could be found. | ||
| 227 | */ | ||
| 228 | const struct ssam_device_id *ssam_device_id_match(const struct ssam_device_id *table, | ||
| 229 | const struct ssam_device_uid uid) | ||
| 230 | { | ||
| 231 | const struct ssam_device_id *id; | ||
| 232 | |||
| 233 | for (id = table; !ssam_device_id_is_null(id); ++id) | ||
| 234 | if (ssam_device_id_compatible(id, uid)) | ||
| 235 | return id; | ||
| 236 | |||
| 237 | return NULL; | ||
| 238 | } | ||
| 239 | EXPORT_SYMBOL_GPL(ssam_device_id_match); | ||
| 240 | |||
| 241 | /** | ||
| 242 | * ssam_device_get_match() - Find and return the ID matching the device in the | ||
| 243 | * ID table of the bound driver. | ||
| 244 | * @dev: The device for which to get the matching ID table entry. | ||
| 245 | * | ||
| 246 | * Find the fist match for the UID of the device in the ID table of the | ||
| 247 | * currently bound driver and return it. Returns %NULL if the device does not | ||
| 248 | * have a driver bound to it, the driver does not have match_table (i.e. it is | ||
| 249 | * %NULL), or there is no match in the driver's match_table. | ||
| 250 | * | ||
| 251 | * This function essentially calls ssam_device_id_match() with the ID table of | ||
| 252 | * the bound device driver and the UID of the device. | ||
| 253 | * | ||
| 254 | * Return: Returns the first match for the UID of the device in the device | ||
| 255 | * driver's match table, or %NULL if no such match could be found. | ||
| 256 | */ | ||
| 257 | const struct ssam_device_id *ssam_device_get_match(const struct ssam_device *dev) | ||
| 258 | { | ||
| 259 | const struct ssam_device_driver *sdrv; | ||
| 260 | |||
| 261 | sdrv = to_ssam_device_driver(dev->dev.driver); | ||
| 262 | if (!sdrv) | ||
| 263 | return NULL; | ||
| 264 | |||
| 265 | if (!sdrv->match_table) | ||
| 266 | return NULL; | ||
| 267 | |||
| 268 | return ssam_device_id_match(sdrv->match_table, dev->uid); | ||
| 269 | } | ||
| 270 | EXPORT_SYMBOL_GPL(ssam_device_get_match); | ||
| 271 | |||
| 272 | /** | ||
| 273 | * ssam_device_get_match_data() - Find the ID matching the device in the | ||
| 274 | * ID table of the bound driver and return its ``driver_data`` member. | ||
| 275 | * @dev: The device for which to get the match data. | ||
| 276 | * | ||
| 277 | * Find the fist match for the UID of the device in the ID table of the | ||
| 278 | * corresponding driver and return its driver_data. Returns %NULL if the | ||
| 279 | * device does not have a driver bound to it, the driver does not have | ||
| 280 | * match_table (i.e. it is %NULL), there is no match in the driver's | ||
| 281 | * match_table, or the match does not have any driver_data. | ||
| 282 | * | ||
| 283 | * This function essentially calls ssam_device_get_match() and, if any match | ||
| 284 | * could be found, returns its ``struct ssam_device_id.driver_data`` member. | ||
| 285 | * | ||
| 286 | * Return: Returns the driver data associated with the first match for the UID | ||
| 287 | * of the device in the device driver's match table, or %NULL if no such match | ||
| 288 | * could be found. | ||
| 289 | */ | ||
| 290 | const void *ssam_device_get_match_data(const struct ssam_device *dev) | ||
| 291 | { | ||
| 292 | const struct ssam_device_id *id; | ||
| 293 | |||
| 294 | id = ssam_device_get_match(dev); | ||
| 295 | if (!id) | ||
| 296 | return NULL; | ||
| 297 | |||
| 298 | return (const void *)id->driver_data; | ||
| 299 | } | ||
| 300 | EXPORT_SYMBOL_GPL(ssam_device_get_match_data); | ||
| 301 | |||
| 302 | static int ssam_bus_match(struct device *dev, struct device_driver *drv) | ||
| 303 | { | ||
| 304 | struct ssam_device_driver *sdrv = to_ssam_device_driver(drv); | ||
| 305 | struct ssam_device *sdev = to_ssam_device(dev); | ||
| 306 | |||
| 307 | if (!is_ssam_device(dev)) | ||
| 308 | return 0; | ||
| 309 | |||
| 310 | return !!ssam_device_id_match(sdrv->match_table, sdev->uid); | ||
| 311 | } | ||
| 312 | |||
| 313 | static int ssam_bus_probe(struct device *dev) | ||
| 314 | { | ||
| 315 | return to_ssam_device_driver(dev->driver) | ||
| 316 | ->probe(to_ssam_device(dev)); | ||
| 317 | } | ||
| 318 | |||
| 319 | static int ssam_bus_remove(struct device *dev) | ||
| 320 | { | ||
| 321 | struct ssam_device_driver *sdrv = to_ssam_device_driver(dev->driver); | ||
| 322 | |||
| 323 | if (sdrv->remove) | ||
| 324 | sdrv->remove(to_ssam_device(dev)); | ||
| 325 | |||
| 326 | return 0; | ||
| 327 | } | ||
| 328 | |||
| 329 | struct bus_type ssam_bus_type = { | ||
| 330 | .name = "surface_aggregator", | ||
| 331 | .match = ssam_bus_match, | ||
| 332 | .probe = ssam_bus_probe, | ||
| 333 | .remove = ssam_bus_remove, | ||
| 334 | }; | ||
| 335 | EXPORT_SYMBOL_GPL(ssam_bus_type); | ||
| 336 | |||
| 337 | /** | ||
| 338 | * __ssam_device_driver_register() - Register a SSAM client device driver. | ||
| 339 | * @sdrv: The driver to register. | ||
| 340 | * @owner: The module owning the provided driver. | ||
| 341 | * | ||
| 342 | * Please refer to the ssam_device_driver_register() macro for the normal way | ||
| 343 | * to register a driver from inside its owning module. | ||
| 344 | */ | ||
| 345 | int __ssam_device_driver_register(struct ssam_device_driver *sdrv, | ||
| 346 | struct module *owner) | ||
| 347 | { | ||
| 348 | sdrv->driver.owner = owner; | ||
| 349 | sdrv->driver.bus = &ssam_bus_type; | ||
| 350 | |||
| 351 | /* force drivers to async probe so I/O is possible in probe */ | ||
| 352 | sdrv->driver.probe_type = PROBE_PREFER_ASYNCHRONOUS; | ||
| 353 | |||
| 354 | return driver_register(&sdrv->driver); | ||
| 355 | } | ||
| 356 | EXPORT_SYMBOL_GPL(__ssam_device_driver_register); | ||
| 357 | |||
| 358 | /** | ||
| 359 | * ssam_device_driver_unregister - Unregister a SSAM device driver. | ||
| 360 | * @sdrv: The driver to unregister. | ||
| 361 | */ | ||
| 362 | void ssam_device_driver_unregister(struct ssam_device_driver *sdrv) | ||
| 363 | { | ||
| 364 | driver_unregister(&sdrv->driver); | ||
| 365 | } | ||
| 366 | EXPORT_SYMBOL_GPL(ssam_device_driver_unregister); | ||
| 367 | |||
| 368 | static int ssam_remove_device(struct device *dev, void *_data) | ||
| 369 | { | ||
| 370 | struct ssam_device *sdev = to_ssam_device(dev); | ||
| 371 | |||
| 372 | if (is_ssam_device(dev)) | ||
| 373 | ssam_device_remove(sdev); | ||
| 374 | |||
| 375 | return 0; | ||
| 376 | } | ||
| 377 | |||
| 378 | /** | ||
| 379 | * ssam_controller_remove_clients() - Remove SSAM client devices registered as | ||
| 380 | * direct children under the given controller. | ||
| 381 | * @ctrl: The controller to remove all direct clients for. | ||
| 382 | * | ||
| 383 | * Remove all SSAM client devices registered as direct children under the | ||
| 384 | * given controller. Note that this only accounts for direct children of the | ||
| 385 | * controller device. This does not take care of any client devices where the | ||
| 386 | * parent device has been manually set before calling ssam_device_add. Refer | ||
| 387 | * to ssam_device_add()/ssam_device_remove() for more details on those cases. | ||
| 388 | * | ||
| 389 | * To avoid new devices being added in parallel to this call, the main | ||
| 390 | * controller lock (not statelock) must be held during this (and if | ||
| 391 | * necessary, any subsequent deinitialization) call. | ||
| 392 | */ | ||
| 393 | void ssam_controller_remove_clients(struct ssam_controller *ctrl) | ||
| 394 | { | ||
| 395 | struct device *dev; | ||
| 396 | |||
| 397 | dev = ssam_controller_device(ctrl); | ||
| 398 | device_for_each_child_reverse(dev, NULL, ssam_remove_device); | ||
| 399 | } | ||
| 400 | |||
| 401 | /** | ||
| 402 | * ssam_bus_register() - Register and set-up the SSAM client device bus. | ||
| 403 | */ | ||
| 404 | int ssam_bus_register(void) | ||
| 405 | { | ||
| 406 | return bus_register(&ssam_bus_type); | ||
| 407 | } | ||
| 408 | |||
| 409 | /** | ||
| 410 | * ssam_bus_unregister() - Unregister the SSAM client device bus. | ||
| 411 | */ | ||
| 412 | void ssam_bus_unregister(void) | ||
| 413 | { | ||
| 414 | return bus_unregister(&ssam_bus_type); | ||
| 415 | } | ||
| @@ -0,0 +1,27 @@ | |||
| 1 | /* SPDX-License-Identifier: GPL-2.0+ */ | ||
| 2 | /* | ||
| 3 | * Surface System Aggregator Module bus and device integration. | ||
| 4 | * | ||
| 5 | * Copyright (C) 2019-2020 Maximilian Luz <luzmaximilian@gmail.com> | ||
| 6 | */ | ||
| 7 | |||
| 8 | #ifndef _SURFACE_AGGREGATOR_BUS_H | ||
| 9 | #define _SURFACE_AGGREGATOR_BUS_H | ||
| 10 | |||
| 11 | #include <linux/surface_aggregator/controller.h> | ||
| 12 | |||
| 13 | #ifdef CONFIG_SURFACE_AGGREGATOR_BUS | ||
| 14 | |||
| 15 | void ssam_controller_remove_clients(struct ssam_controller *ctrl); | ||
| 16 | |||
| 17 | int ssam_bus_register(void); | ||
| 18 | void ssam_bus_unregister(void); | ||
| 19 | |||
| 20 | #else /* CONFIG_SURFACE_AGGREGATOR_BUS */ | ||
| 21 | |||
| 22 | static inline void ssam_controller_remove_clients(struct ssam_controller *ctrl) {} | ||
| 23 | static inline int ssam_bus_register(void) { return 0; } | ||
| 24 | static inline void ssam_bus_unregister(void) {} | ||
| 25 | |||
| 26 | #endif /* CONFIG_SURFACE_AGGREGATOR_BUS */ | ||
| 27 | #endif /* _SURFACE_AGGREGATOR_BUS_H */ | ||
| @@ -0,0 +1,2579 @@ | |||
| 1 | // SPDX-License-Identifier: GPL-2.0+ | ||
| 2 | /* | ||
| 3 | * Main SSAM/SSH controller structure and functionality. | ||
| 4 | * | ||
| 5 | * Copyright (C) 2019-2020 Maximilian Luz <luzmaximilian@gmail.com> | ||
| 6 | */ | ||
| 7 | |||
| 8 | #include <linux/acpi.h> | ||
| 9 | #include <linux/atomic.h> | ||
| 10 | #include <linux/completion.h> | ||
| 11 | #include <linux/gpio/consumer.h> | ||
| 12 | #include <linux/interrupt.h> | ||
| 13 | #include <linux/kref.h> | ||
| 14 | #include <linux/limits.h> | ||
| 15 | #include <linux/list.h> | ||
| 16 | #include <linux/lockdep.h> | ||
| 17 | #include <linux/mutex.h> | ||
| 18 | #include <linux/rculist.h> | ||
| 19 | #include <linux/rbtree.h> | ||
| 20 | #include <linux/rwsem.h> | ||
| 21 | #include <linux/serdev.h> | ||
| 22 | #include <linux/slab.h> | ||
| 23 | #include <linux/spinlock.h> | ||
| 24 | #include <linux/srcu.h> | ||
| 25 | #include <linux/types.h> | ||
| 26 | #include <linux/workqueue.h> | ||
| 27 | |||
| 28 | #include <linux/surface_aggregator/controller.h> | ||
| 29 | #include <linux/surface_aggregator/serial_hub.h> | ||
| 30 | |||
| 31 | #include "controller.h" | ||
| 32 | #include "ssh_msgb.h" | ||
| 33 | #include "ssh_request_layer.h" | ||
| 34 | |||
| 35 | #include "trace.h" | ||
| 36 | |||
| 37 | |||
| 38 | /* -- Safe counters. -------------------------------------------------------- */ | ||
| 39 | |||
| 40 | /** | ||
| 41 | * ssh_seq_reset() - Reset/initialize sequence ID counter. | ||
| 42 | * @c: The counter to reset. | ||
| 43 | */ | ||
| 44 | static void ssh_seq_reset(struct ssh_seq_counter *c) | ||
| 45 | { | ||
| 46 | WRITE_ONCE(c->value, 0); | ||
| 47 | } | ||
| 48 | |||
| 49 | /** | ||
| 50 | * ssh_seq_next() - Get next sequence ID. | ||
| 51 | * @c: The counter providing the sequence IDs. | ||
| 52 | * | ||
| 53 | * Return: Returns the next sequence ID of the counter. | ||
| 54 | */ | ||
| 55 | static u8 ssh_seq_next(struct ssh_seq_counter *c) | ||
| 56 | { | ||
| 57 | u8 old = READ_ONCE(c->value); | ||
| 58 | u8 new = old + 1; | ||
| 59 | u8 ret; | ||
| 60 | |||
| 61 | while (unlikely((ret = cmpxchg(&c->value, old, new)) != old)) { | ||
| 62 | old = ret; | ||
| 63 | new = old + 1; | ||
| 64 | } | ||
| 65 | |||
| 66 | return old; | ||
| 67 | } | ||
| 68 | |||
| 69 | /** | ||
| 70 | * ssh_rqid_reset() - Reset/initialize request ID counter. | ||
| 71 | * @c: The counter to reset. | ||
| 72 | */ | ||
| 73 | static void ssh_rqid_reset(struct ssh_rqid_counter *c) | ||
| 74 | { | ||
| 75 | WRITE_ONCE(c->value, 0); | ||
| 76 | } | ||
| 77 | |||
| 78 | /** | ||
| 79 | * ssh_rqid_next() - Get next request ID. | ||
| 80 | * @c: The counter providing the request IDs. | ||
| 81 | * | ||
| 82 | * Return: Returns the next request ID of the counter, skipping any reserved | ||
| 83 | * request IDs. | ||
| 84 | */ | ||
| 85 | static u16 ssh_rqid_next(struct ssh_rqid_counter *c) | ||
| 86 | { | ||
| 87 | u16 old = READ_ONCE(c->value); | ||
| 88 | u16 new = ssh_rqid_next_valid(old); | ||
| 89 | u16 ret; | ||
| 90 | |||
| 91 | while (unlikely((ret = cmpxchg(&c->value, old, new)) != old)) { | ||
| 92 | old = ret; | ||
| 93 | new = ssh_rqid_next_valid(old); | ||
| 94 | } | ||
| 95 | |||
| 96 | return old; | ||
| 97 | } | ||
| 98 | |||
| 99 | |||
| 100 | /* -- Event notifier/callbacks. --------------------------------------------- */ | ||
| 101 | /* | ||
| 102 | * The notifier system is based on linux/notifier.h, specifically the SRCU | ||
| 103 | * implementation. The difference to that is, that some bits of the notifier | ||
| 104 | * call return value can be tracked across multiple calls. This is done so | ||
| 105 | * that handling of events can be tracked and a warning can be issued in case | ||
| 106 | * an event goes unhandled. The idea of that warning is that it should help | ||
| 107 | * discover and identify new/currently unimplemented features. | ||
| 108 | */ | ||
| 109 | |||
| 110 | /** | ||
| 111 | * ssam_event_matches_notifier() - Test if an event matches a notifier. | ||
| 112 | * @n: The event notifier to test against. | ||
| 113 | * @event: The event to test. | ||
| 114 | * | ||
| 115 | * Return: Returns %true if the given event matches the given notifier | ||
| 116 | * according to the rules set in the notifier's event mask, %false otherwise. | ||
| 117 | */ | ||
| 118 | static bool ssam_event_matches_notifier(const struct ssam_event_notifier *n, | ||
| 119 | const struct ssam_event *event) | ||
| 120 | { | ||
| 121 | bool match = n->event.id.target_category == event->target_category; | ||
| 122 | |||
| 123 | if (n->event.mask & SSAM_EVENT_MASK_TARGET) | ||
| 124 | match &= n->event.reg.target_id == event->target_id; | ||
| 125 | |||
| 126 | if (n->event.mask & SSAM_EVENT_MASK_INSTANCE) | ||
| 127 | match &= n->event.id.instance == event->instance_id; | ||
| 128 | |||
| 129 | return match; | ||
| 130 | } | ||
| 131 | |||
| 132 | /** | ||
| 133 | * ssam_nfblk_call_chain() - Call event notifier callbacks of the given chain. | ||
| 134 | * @nh: The notifier head for which the notifier callbacks should be called. | ||
| 135 | * @event: The event data provided to the callbacks. | ||
| 136 | * | ||
| 137 | * Call all registered notifier callbacks in order of their priority until | ||
| 138 | * either no notifier is left or a notifier returns a value with the | ||
| 139 | * %SSAM_NOTIF_STOP bit set. Note that this bit is automatically set via | ||
| 140 | * ssam_notifier_from_errno() on any non-zero error value. | ||
| 141 | * | ||
| 142 | * Return: Returns the notifier status value, which contains the notifier | ||
| 143 | * status bits (%SSAM_NOTIF_HANDLED and %SSAM_NOTIF_STOP) as well as a | ||
| 144 | * potential error value returned from the last executed notifier callback. | ||
| 145 | * Use ssam_notifier_to_errno() to convert this value to the original error | ||
| 146 | * value. | ||
| 147 | */ | ||
| 148 | static int ssam_nfblk_call_chain(struct ssam_nf_head *nh, struct ssam_event *event) | ||
| 149 | { | ||
| 150 | struct ssam_event_notifier *nf; | ||
| 151 | int ret = 0, idx; | ||
| 152 | |||
| 153 | idx = srcu_read_lock(&nh->srcu); | ||
| 154 | |||
| 155 | list_for_each_entry_rcu(nf, &nh->head, base.node, | ||
| 156 | srcu_read_lock_held(&nh->srcu)) { | ||
| 157 | if (ssam_event_matches_notifier(nf, event)) { | ||
| 158 | ret = (ret & SSAM_NOTIF_STATE_MASK) | nf->base.fn(nf, event); | ||
| 159 | if (ret & SSAM_NOTIF_STOP) | ||
| 160 | break; | ||
| 161 | } | ||
| 162 | } | ||
| 163 | |||
| 164 | srcu_read_unlock(&nh->srcu, idx); | ||
| 165 | return ret; | ||
| 166 | } | ||
| 167 | |||
| 168 | /** | ||
| 169 | * ssam_nfblk_insert() - Insert a new notifier block into the given notifier | ||
| 170 | * list. | ||
| 171 | * @nh: The notifier head into which the block should be inserted. | ||
| 172 | * @nb: The notifier block to add. | ||
| 173 | * | ||
| 174 | * Note: This function must be synchronized by the caller with respect to other | ||
| 175 | * insert, find, and/or remove calls by holding ``struct ssam_nf.lock``. | ||
| 176 | * | ||
| 177 | * Return: Returns zero on success, %-EEXIST if the notifier block has already | ||
| 178 | * been registered. | ||
| 179 | */ | ||
| 180 | static int ssam_nfblk_insert(struct ssam_nf_head *nh, struct ssam_notifier_block *nb) | ||
| 181 | { | ||
| 182 | struct ssam_notifier_block *p; | ||
| 183 | struct list_head *h; | ||
| 184 | |||
| 185 | /* Runs under lock, no need for RCU variant. */ | ||
| 186 | list_for_each(h, &nh->head) { | ||
| 187 | p = list_entry(h, struct ssam_notifier_block, node); | ||
| 188 | |||
| 189 | if (unlikely(p == nb)) { | ||
| 190 | WARN(1, "double register detected"); | ||
| 191 | return -EEXIST; | ||
| 192 | } | ||
| 193 | |||
| 194 | if (nb->priority > p->priority) | ||
| 195 | break; | ||
| 196 | } | ||
| 197 | |||
| 198 | list_add_tail_rcu(&nb->node, h); | ||
| 199 | return 0; | ||
| 200 | } | ||
| 201 | |||
| 202 | /** | ||
| 203 | * ssam_nfblk_find() - Check if a notifier block is registered on the given | ||
| 204 | * notifier head. | ||
| 205 | * list. | ||
| 206 | * @nh: The notifier head on which to search. | ||
| 207 | * @nb: The notifier block to search for. | ||
| 208 | * | ||
| 209 | * Note: This function must be synchronized by the caller with respect to other | ||
| 210 | * insert, find, and/or remove calls by holding ``struct ssam_nf.lock``. | ||
| 211 | * | ||
| 212 | * Return: Returns true if the given notifier block is registered on the given | ||
| 213 | * notifier head, false otherwise. | ||
| 214 | */ | ||
| 215 | static bool ssam_nfblk_find(struct ssam_nf_head *nh, struct ssam_notifier_block *nb) | ||
| 216 | { | ||
| 217 | struct ssam_notifier_block *p; | ||
| 218 | |||
| 219 | /* Runs under lock, no need for RCU variant. */ | ||
| 220 | list_for_each_entry(p, &nh->head, node) { | ||
| 221 | if (p == nb) | ||
| 222 | return true; | ||
| 223 | } | ||
| 224 | |||
| 225 | return false; | ||
| 226 | } | ||
| 227 | |||
| 228 | /** | ||
| 229 | * ssam_nfblk_remove() - Remove a notifier block from its notifier list. | ||
| 230 | * @nb: The notifier block to be removed. | ||
| 231 | * | ||
| 232 | * Note: This function must be synchronized by the caller with respect to | ||
| 233 | * other insert, find, and/or remove calls by holding ``struct ssam_nf.lock``. | ||
| 234 | * Furthermore, the caller _must_ ensure SRCU synchronization by calling | ||
| 235 | * synchronize_srcu() with ``nh->srcu`` after leaving the critical section, to | ||
| 236 | * ensure that the removed notifier block is not in use any more. | ||
| 237 | */ | ||
| 238 | static void ssam_nfblk_remove(struct ssam_notifier_block *nb) | ||
| 239 | { | ||
| 240 | list_del_rcu(&nb->node); | ||
| 241 | } | ||
| 242 | |||
| 243 | /** | ||
| 244 | * ssam_nf_head_init() - Initialize the given notifier head. | ||
| 245 | * @nh: The notifier head to initialize. | ||
| 246 | */ | ||
| 247 | static int ssam_nf_head_init(struct ssam_nf_head *nh) | ||
| 248 | { | ||
| 249 | int status; | ||
| 250 | |||
| 251 | status = init_srcu_struct(&nh->srcu); | ||
| 252 | if (status) | ||
| 253 | return status; | ||
| 254 | |||
| 255 | INIT_LIST_HEAD(&nh->head); | ||
| 256 | return 0; | ||
| 257 | } | ||
| 258 | |||
| 259 | /** | ||
| 260 | * ssam_nf_head_destroy() - Deinitialize the given notifier head. | ||
| 261 | * @nh: The notifier head to deinitialize. | ||
| 262 | */ | ||
| 263 | static void ssam_nf_head_destroy(struct ssam_nf_head *nh) | ||
| 264 | { | ||
| 265 | cleanup_srcu_struct(&nh->srcu); | ||
| 266 | } | ||
| 267 | |||
| 268 | |||
| 269 | /* -- Event/notification registry. ------------------------------------------ */ | ||
| 270 | |||
| 271 | /** | ||
| 272 | * struct ssam_nf_refcount_key - Key used for event activation reference | ||
| 273 | * counting. | ||
| 274 | * @reg: The registry via which the event is enabled/disabled. | ||
| 275 | * @id: The ID uniquely describing the event. | ||
| 276 | */ | ||
| 277 | struct ssam_nf_refcount_key { | ||
| 278 | struct ssam_event_registry reg; | ||
| 279 | struct ssam_event_id id; | ||
| 280 | }; | ||
| 281 | |||
| 282 | /** | ||
| 283 | * struct ssam_nf_refcount_entry - RB-tree entry for reference counting event | ||
| 284 | * activations. | ||
| 285 | * @node: The node of this entry in the rb-tree. | ||
| 286 | * @key: The key of the event. | ||
| 287 | * @refcount: The reference-count of the event. | ||
| 288 | * @flags: The flags used when enabling the event. | ||
| 289 | */ | ||
| 290 | struct ssam_nf_refcount_entry { | ||
| 291 | struct rb_node node; | ||
| 292 | struct ssam_nf_refcount_key key; | ||
| 293 | int refcount; | ||
| 294 | u8 flags; | ||
| 295 | }; | ||
| 296 | |||
| 297 | /** | ||
| 298 | * ssam_nf_refcount_inc() - Increment reference-/activation-count of the given | ||
| 299 | * event. | ||
| 300 | * @nf: The notifier system reference. | ||
| 301 | * @reg: The registry used to enable/disable the event. | ||
| 302 | * @id: The event ID. | ||
| 303 | * | ||
| 304 | * Increments the reference-/activation-count associated with the specified | ||
| 305 | * event type/ID, allocating a new entry for this event ID if necessary. A | ||
| 306 | * newly allocated entry will have a refcount of one. | ||
| 307 | * | ||
| 308 | * Note: ``nf->lock`` must be held when calling this function. | ||
| 309 | * | ||
| 310 | * Return: Returns the refcount entry on success. Returns an error pointer | ||
| 311 | * with %-ENOSPC if there have already been %INT_MAX events of the specified | ||
| 312 | * ID and type registered, or %-ENOMEM if the entry could not be allocated. | ||
| 313 | */ | ||
| 314 | static struct ssam_nf_refcount_entry * | ||
| 315 | ssam_nf_refcount_inc(struct ssam_nf *nf, struct ssam_event_registry reg, | ||
| 316 | struct ssam_event_id id) | ||
| 317 | { | ||
| 318 | struct ssam_nf_refcount_entry *entry; | ||
| 319 | struct ssam_nf_refcount_key key; | ||
| 320 | struct rb_node **link = &nf->refcount.rb_node; | ||
| 321 | struct rb_node *parent = NULL; | ||
| 322 | int cmp; | ||
| 323 | |||
| 324 | lockdep_assert_held(&nf->lock); | ||
| 325 | |||
| 326 | key.reg = reg; | ||
| 327 | key.id = id; | ||
| 328 | |||
| 329 | while (*link) { | ||
| 330 | entry = rb_entry(*link, struct ssam_nf_refcount_entry, node); | ||
| 331 | parent = *link; | ||
| 332 | |||
| 333 | cmp = memcmp(&key, &entry->key, sizeof(key)); | ||
| 334 | if (cmp < 0) { | ||
| 335 | link = &(*link)->rb_left; | ||
| 336 | } else if (cmp > 0) { | ||
| 337 | link = &(*link)->rb_right; | ||
| 338 | } else if (entry->refcount < INT_MAX) { | ||
| 339 | entry->refcount++; | ||
| 340 | return entry; | ||
| 341 | } else { | ||
| 342 | WARN_ON(1); | ||
| 343 | return ERR_PTR(-ENOSPC); | ||
| 344 | } | ||
| 345 | } | ||
| 346 | |||
| 347 | entry = kzalloc(sizeof(*entry), GFP_KERNEL); | ||
| 348 | if (!entry) | ||
| 349 | return ERR_PTR(-ENOMEM); | ||
| 350 | |||
| 351 | entry->key = key; | ||
| 352 | entry->refcount = 1; | ||
| 353 | |||
| 354 | rb_link_node(&entry->node, parent, link); | ||
| 355 | rb_insert_color(&entry->node, &nf->refcount); | ||
| 356 | |||
| 357 | return entry; | ||
| 358 | } | ||
| 359 | |||
| 360 | /** | ||
| 361 | * ssam_nf_refcount_dec() - Decrement reference-/activation-count of the given | ||
| 362 | * event. | ||
| 363 | * @nf: The notifier system reference. | ||
| 364 | * @reg: The registry used to enable/disable the event. | ||
| 365 | * @id: The event ID. | ||
| 366 | * | ||
| 367 | * Decrements the reference-/activation-count of the specified event, | ||
| 368 | * returning its entry. If the returned entry has a refcount of zero, the | ||
| 369 | * caller is responsible for freeing it using kfree(). | ||
| 370 | * | ||
| 371 | * Note: ``nf->lock`` must be held when calling this function. | ||
| 372 | * | ||
| 373 | * Return: Returns the refcount entry on success or %NULL if the entry has not | ||
| 374 | * been found. | ||
| 375 | */ | ||
| 376 | static struct ssam_nf_refcount_entry * | ||
| 377 | ssam_nf_refcount_dec(struct ssam_nf *nf, struct ssam_event_registry reg, | ||
| 378 | struct ssam_event_id id) | ||
| 379 | { | ||
| 380 | struct ssam_nf_refcount_entry *entry; | ||
| 381 | struct ssam_nf_refcount_key key; | ||
| 382 | struct rb_node *node = nf->refcount.rb_node; | ||
| 383 | int cmp; | ||
| 384 | |||
| 385 | lockdep_assert_held(&nf->lock); | ||
| 386 | |||
| 387 | key.reg = reg; | ||
| 388 | key.id = id; | ||
| 389 | |||
| 390 | while (node) { | ||
| 391 | entry = rb_entry(node, struct ssam_nf_refcount_entry, node); | ||
| 392 | |||
| 393 | cmp = memcmp(&key, &entry->key, sizeof(key)); | ||
| 394 | if (cmp < 0) { | ||
| 395 | node = node->rb_left; | ||
| 396 | } else if (cmp > 0) { | ||
| 397 | node = node->rb_right; | ||
| 398 | } else { | ||
| 399 | entry->refcount--; | ||
| 400 | if (entry->refcount == 0) | ||
| 401 | rb_erase(&entry->node, &nf->refcount); | ||
| 402 | |||
| 403 | return entry; | ||
| 404 | } | ||
| 405 | } | ||
| 406 | |||
| 407 | return NULL; | ||
| 408 | } | ||
| 409 | |||
| 410 | /** | ||
| 411 | * ssam_nf_refcount_empty() - Test if the notification system has any | ||
| 412 | * enabled/active events. | ||
| 413 | * @nf: The notification system. | ||
| 414 | */ | ||
| 415 | static bool ssam_nf_refcount_empty(struct ssam_nf *nf) | ||
| 416 | { | ||
| 417 | return RB_EMPTY_ROOT(&nf->refcount); | ||
| 418 | } | ||
| 419 | |||
| 420 | /** | ||
| 421 | * ssam_nf_call() - Call notification callbacks for the provided event. | ||
| 422 | * @nf: The notifier system | ||
| 423 | * @dev: The associated device, only used for logging. | ||
| 424 | * @rqid: The request ID of the event. | ||
| 425 | * @event: The event provided to the callbacks. | ||
| 426 | * | ||
| 427 | * Execute registered callbacks in order of their priority until either no | ||
| 428 | * callback is left or a callback returns a value with the %SSAM_NOTIF_STOP | ||
| 429 | * bit set. Note that this bit is set automatically when converting non-zero | ||
| 430 | * error values via ssam_notifier_from_errno() to notifier values. | ||
| 431 | * | ||
| 432 | * Also note that any callback that could handle an event should return a value | ||
| 433 | * with bit %SSAM_NOTIF_HANDLED set, indicating that the event does not go | ||
| 434 | * unhandled/ignored. In case no registered callback could handle an event, | ||
| 435 | * this function will emit a warning. | ||
| 436 | * | ||
| 437 | * In case a callback failed, this function will emit an error message. | ||
| 438 | */ | ||
| 439 | static void ssam_nf_call(struct ssam_nf *nf, struct device *dev, u16 rqid, | ||
| 440 | struct ssam_event *event) | ||
| 441 | { | ||
| 442 | struct ssam_nf_head *nf_head; | ||
| 443 | int status, nf_ret; | ||
| 444 | |||
| 445 | if (!ssh_rqid_is_event(rqid)) { | ||
| 446 | dev_warn(dev, "event: unsupported rqid: %#06x\n", rqid); | ||
| 447 | return; | ||
| 448 | } | ||
| 449 | |||
| 450 | nf_head = &nf->head[ssh_rqid_to_event(rqid)]; | ||
| 451 | nf_ret = ssam_nfblk_call_chain(nf_head, event); | ||
| 452 | status = ssam_notifier_to_errno(nf_ret); | ||
| 453 | |||
| 454 | if (status < 0) { | ||
| 455 | dev_err(dev, | ||
| 456 | "event: error handling event: %d (tc: %#04x, tid: %#04x, cid: %#04x, iid: %#04x)\n", | ||
| 457 | status, event->target_category, event->target_id, | ||
| 458 | event->command_id, event->instance_id); | ||
| 459 | } else if (!(nf_ret & SSAM_NOTIF_HANDLED)) { | ||
| 460 | dev_warn(dev, | ||
| 461 | "event: unhandled event (rqid: %#04x, tc: %#04x, tid: %#04x, cid: %#04x, iid: %#04x)\n", | ||
| 462 | rqid, event->target_category, event->target_id, | ||
| 463 | event->command_id, event->instance_id); | ||
| 464 | } | ||
| 465 | } | ||
| 466 | |||
| 467 | /** | ||
| 468 | * ssam_nf_init() - Initialize the notifier system. | ||
| 469 | * @nf: The notifier system to initialize. | ||
| 470 | */ | ||
| 471 | static int ssam_nf_init(struct ssam_nf *nf) | ||
| 472 | { | ||
| 473 | int i, status; | ||
| 474 | |||
| 475 | for (i = 0; i < SSH_NUM_EVENTS; i++) { | ||
| 476 | status = ssam_nf_head_init(&nf->head[i]); | ||
| 477 | if (status) | ||
| 478 | break; | ||
| 479 | } | ||
| 480 | |||
| 481 | if (status) { | ||
| 482 | while (i--) | ||
| 483 | ssam_nf_head_destroy(&nf->head[i]); | ||
| 484 | |||
| 485 | return status; | ||
| 486 | } | ||
| 487 | |||
| 488 | mutex_init(&nf->lock); | ||
| 489 | return 0; | ||
| 490 | } | ||
| 491 | |||
| 492 | /** | ||
| 493 | * ssam_nf_destroy() - Deinitialize the notifier system. | ||
| 494 | * @nf: The notifier system to deinitialize. | ||
| 495 | */ | ||
| 496 | static void ssam_nf_destroy(struct ssam_nf *nf) | ||
| 497 | { | ||
| 498 | int i; | ||
| 499 | |||
| 500 | for (i = 0; i < SSH_NUM_EVENTS; i++) | ||
| 501 | ssam_nf_head_destroy(&nf->head[i]); | ||
| 502 | |||
| 503 | mutex_destroy(&nf->lock); | ||
| 504 | } | ||
| 505 | |||
| 506 | |||
| 507 | /* -- Event/async request completion system. -------------------------------- */ | ||
| 508 | |||
| 509 | #define SSAM_CPLT_WQ_NAME "ssam_cpltq" | ||
| 510 | |||
| 511 | /* | ||
| 512 | * SSAM_CPLT_WQ_BATCH - Maximum number of event item completions executed per | ||
| 513 | * work execution. Used to prevent livelocking of the workqueue. Value chosen | ||
| 514 | * via educated guess, may be adjusted. | ||
| 515 | */ | ||
| 516 | #define SSAM_CPLT_WQ_BATCH 10 | ||
| 517 | |||
| 518 | /* | ||
| 519 | * SSAM_EVENT_ITEM_CACHE_PAYLOAD_LEN - Maximum payload length for a cached | ||
| 520 | * &struct ssam_event_item. | ||
| 521 | * | ||
| 522 | * This length has been chosen to be accommodate standard touchpad and | ||
| 523 | * keyboard input events. Events with larger payloads will be allocated | ||
| 524 | * separately. | ||
| 525 | */ | ||
| 526 | #define SSAM_EVENT_ITEM_CACHE_PAYLOAD_LEN 32 | ||
| 527 | |||
| 528 | static struct kmem_cache *ssam_event_item_cache; | ||
| 529 | |||
| 530 | /** | ||
| 531 | * ssam_event_item_cache_init() - Initialize the event item cache. | ||
| 532 | */ | ||
| 533 | int ssam_event_item_cache_init(void) | ||
| 534 | { | ||
| 535 | const unsigned int size = sizeof(struct ssam_event_item) | ||
| 536 | + SSAM_EVENT_ITEM_CACHE_PAYLOAD_LEN; | ||
| 537 | const unsigned int align = __alignof__(struct ssam_event_item); | ||
| 538 | struct kmem_cache *cache; | ||
| 539 | |||
| 540 | cache = kmem_cache_create("ssam_event_item", size, align, 0, NULL); | ||
| 541 | if (!cache) | ||
| 542 | return -ENOMEM; | ||
| 543 | |||
| 544 | ssam_event_item_cache = cache; | ||
| 545 | return 0; | ||
| 546 | } | ||
| 547 | |||
| 548 | /** | ||
| 549 | * ssam_event_item_cache_destroy() - Deinitialize the event item cache. | ||
| 550 | */ | ||
| 551 | void ssam_event_item_cache_destroy(void) | ||
| 552 | { | ||
| 553 | kmem_cache_destroy(ssam_event_item_cache); | ||
| 554 | ssam_event_item_cache = NULL; | ||
| 555 | } | ||
| 556 | |||
| 557 | static void __ssam_event_item_free_cached(struct ssam_event_item *item) | ||
| 558 | { | ||
| 559 | kmem_cache_free(ssam_event_item_cache, item); | ||
| 560 | } | ||
| 561 | |||
| 562 | static void __ssam_event_item_free_generic(struct ssam_event_item *item) | ||
| 563 | { | ||
| 564 | kfree(item); | ||
| 565 | } | ||
| 566 | |||
| 567 | /** | ||
| 568 | * ssam_event_item_free() - Free the provided event item. | ||
| 569 | * @item: The event item to free. | ||
| 570 | */ | ||
| 571 | static void ssam_event_item_free(struct ssam_event_item *item) | ||
| 572 | { | ||
| 573 | trace_ssam_event_item_free(item); | ||
| 574 | item->ops.free(item); | ||
| 575 | } | ||
| 576 | |||
| 577 | /** | ||
| 578 | * ssam_event_item_alloc() - Allocate an event item with the given payload size. | ||
| 579 | * @len: The event payload length. | ||
| 580 | * @flags: The flags used for allocation. | ||
| 581 | * | ||
| 582 | * Allocate an event item with the given payload size, preferring allocation | ||
| 583 | * from the event item cache if the payload is small enough (i.e. smaller than | ||
| 584 | * %SSAM_EVENT_ITEM_CACHE_PAYLOAD_LEN). Sets the item operations and payload | ||
| 585 | * length values. The item free callback (``ops.free``) should not be | ||
| 586 | * overwritten after this call. | ||
| 587 | * | ||
| 588 | * Return: Returns the newly allocated event item. | ||
| 589 | */ | ||
| 590 | static struct ssam_event_item *ssam_event_item_alloc(size_t len, gfp_t flags) | ||
| 591 | { | ||
| 592 | struct ssam_event_item *item; | ||
| 593 | |||
| 594 | if (len <= SSAM_EVENT_ITEM_CACHE_PAYLOAD_LEN) { | ||
| 595 | item = kmem_cache_alloc(ssam_event_item_cache, flags); | ||
| 596 | if (!item) | ||
| 597 | return NULL; | ||
| 598 | |||
| 599 | item->ops.free = __ssam_event_item_free_cached; | ||
| 600 | } else { | ||
| 601 | item = kzalloc(struct_size(item, event.data, len), flags); | ||
| 602 | if (!item) | ||
| 603 | return NULL; | ||
| 604 | |||
| 605 | item->ops.free = __ssam_event_item_free_generic; | ||
| 606 | } | ||
| 607 | |||
| 608 | item->event.length = len; | ||
| 609 | |||
| 610 | trace_ssam_event_item_alloc(item, len); | ||
| 611 | return item; | ||
| 612 | } | ||
| 613 | |||
| 614 | /** | ||
| 615 | * ssam_event_queue_push() - Push an event item to the event queue. | ||
| 616 | * @q: The event queue. | ||
| 617 | * @item: The item to add. | ||
| 618 | */ | ||
| 619 | static void ssam_event_queue_push(struct ssam_event_queue *q, | ||
| 620 | struct ssam_event_item *item) | ||
| 621 | { | ||
| 622 | spin_lock(&q->lock); | ||
| 623 | list_add_tail(&item->node, &q->head); | ||
| 624 | spin_unlock(&q->lock); | ||
| 625 | } | ||
| 626 | |||
| 627 | /** | ||
| 628 | * ssam_event_queue_pop() - Pop the next event item from the event queue. | ||
| 629 | * @q: The event queue. | ||
| 630 | * | ||
| 631 | * Returns and removes the next event item from the queue. Returns %NULL If | ||
| 632 | * there is no event item left. | ||
| 633 | */ | ||
| 634 | static struct ssam_event_item *ssam_event_queue_pop(struct ssam_event_queue *q) | ||
| 635 | { | ||
| 636 | struct ssam_event_item *item; | ||
| 637 | |||
| 638 | spin_lock(&q->lock); | ||
| 639 | item = list_first_entry_or_null(&q->head, struct ssam_event_item, node); | ||
| 640 | if (item) | ||
| 641 | list_del(&item->node); | ||
| 642 | spin_unlock(&q->lock); | ||
| 643 | |||
| 644 | return item; | ||
| 645 | } | ||
| 646 | |||
| 647 | /** | ||
| 648 | * ssam_event_queue_is_empty() - Check if the event queue is empty. | ||
| 649 | * @q: The event queue. | ||
| 650 | */ | ||
| 651 | static bool ssam_event_queue_is_empty(struct ssam_event_queue *q) | ||
| 652 | { | ||
| 653 | bool empty; | ||
| 654 | |||
| 655 | spin_lock(&q->lock); | ||
| 656 | empty = list_empty(&q->head); | ||
| 657 | spin_unlock(&q->lock); | ||
| 658 | |||
| 659 | return empty; | ||
| 660 | } | ||
| 661 | |||
| 662 | /** | ||
| 663 | * ssam_cplt_get_event_queue() - Get the event queue for the given parameters. | ||
| 664 | * @cplt: The completion system on which to look for the queue. | ||
| 665 | * @tid: The target ID of the queue. | ||
| 666 | * @rqid: The request ID representing the event ID for which to get the queue. | ||
| 667 | * | ||
| 668 | * Return: Returns the event queue corresponding to the event type described | ||
| 669 | * by the given parameters. If the request ID does not represent an event, | ||
| 670 | * this function returns %NULL. If the target ID is not supported, this | ||
| 671 | * function will fall back to the default target ID (``tid = 1``). | ||
| 672 | */ | ||
| 673 | static | ||
| 674 | struct ssam_event_queue *ssam_cplt_get_event_queue(struct ssam_cplt *cplt, | ||
| 675 | u8 tid, u16 rqid) | ||
| 676 | { | ||
| 677 | u16 event = ssh_rqid_to_event(rqid); | ||
| 678 | u16 tidx = ssh_tid_to_index(tid); | ||
| 679 | |||
| 680 | if (!ssh_rqid_is_event(rqid)) { | ||
| 681 | dev_err(cplt->dev, "event: unsupported request ID: %#06x\n", rqid); | ||
| 682 | return NULL; | ||
| 683 | } | ||
| 684 | |||
| 685 | if (!ssh_tid_is_valid(tid)) { | ||
| 686 | dev_warn(cplt->dev, "event: unsupported target ID: %u\n", tid); | ||
| 687 | tidx = 0; | ||
| 688 | } | ||
| 689 | |||
| 690 | return &cplt->event.target[tidx].queue[event]; | ||
| 691 | } | ||
| 692 | |||
| 693 | /** | ||
| 694 | * ssam_cplt_submit() - Submit a work item to the completion system workqueue. | ||
| 695 | * @cplt: The completion system. | ||
| 696 | * @work: The work item to submit. | ||
| 697 | */ | ||
| 698 | static bool ssam_cplt_submit(struct ssam_cplt *cplt, struct work_struct *work) | ||
| 699 | { | ||
| 700 | return queue_work(cplt->wq, work); | ||
| 701 | } | ||
| 702 | |||
| 703 | /** | ||
| 704 | * ssam_cplt_submit_event() - Submit an event to the completion system. | ||
| 705 | * @cplt: The completion system. | ||
| 706 | * @item: The event item to submit. | ||
| 707 | * | ||
| 708 | * Submits the event to the completion system by queuing it on the event item | ||
| 709 | * queue and queuing the respective event queue work item on the completion | ||
| 710 | * workqueue, which will eventually complete the event. | ||
| 711 | * | ||
| 712 | * Return: Returns zero on success, %-EINVAL if there is no event queue that | ||
| 713 | * can handle the given event item. | ||
| 714 | */ | ||
| 715 | static int ssam_cplt_submit_event(struct ssam_cplt *cplt, | ||
| 716 | struct ssam_event_item *item) | ||
| 717 | { | ||
| 718 | struct ssam_event_queue *evq; | ||
| 719 | |||
| 720 | evq = ssam_cplt_get_event_queue(cplt, item->event.target_id, item->rqid); | ||
| 721 | if (!evq) | ||
| 722 | return -EINVAL; | ||
| 723 | |||
| 724 | ssam_event_queue_push(evq, item); | ||
| 725 | ssam_cplt_submit(cplt, &evq->work); | ||
| 726 | return 0; | ||
| 727 | } | ||
| 728 | |||
| 729 | /** | ||
| 730 | * ssam_cplt_flush() - Flush the completion system. | ||
| 731 | * @cplt: The completion system. | ||
| 732 | * | ||
| 733 | * Flush the completion system by waiting until all currently submitted work | ||
| 734 | * items have been completed. | ||
| 735 | * | ||
| 736 | * Note: This function does not guarantee that all events will have been | ||
| 737 | * handled once this call terminates. In case of a larger number of | ||
| 738 | * to-be-completed events, the event queue work function may re-schedule its | ||
| 739 | * work item, which this flush operation will ignore. | ||
| 740 | * | ||
| 741 | * This operation is only intended to, during normal operation prior to | ||
| 742 | * shutdown, try to complete most events and requests to get them out of the | ||
| 743 | * system while the system is still fully operational. It does not aim to | ||
| 744 | * provide any guarantee that all of them have been handled. | ||
| 745 | */ | ||
| 746 | static void ssam_cplt_flush(struct ssam_cplt *cplt) | ||
| 747 | { | ||
| 748 | flush_workqueue(cplt->wq); | ||
| 749 | } | ||
| 750 | |||
| 751 | static void ssam_event_queue_work_fn(struct work_struct *work) | ||
| 752 | { | ||
| 753 | struct ssam_event_queue *queue; | ||
| 754 | struct ssam_event_item *item; | ||
| 755 | struct ssam_nf *nf; | ||
| 756 | struct device *dev; | ||
| 757 | unsigned int iterations = SSAM_CPLT_WQ_BATCH; | ||
| 758 | |||
| 759 | queue = container_of(work, struct ssam_event_queue, work); | ||
| 760 | nf = &queue->cplt->event.notif; | ||
| 761 | dev = queue->cplt->dev; | ||
| 762 | |||
| 763 | /* Limit number of processed events to avoid livelocking. */ | ||
| 764 | do { | ||
| 765 | item = ssam_event_queue_pop(queue); | ||
| 766 | if (!item) | ||
| 767 | return; | ||
| 768 | |||
| 769 | ssam_nf_call(nf, dev, item->rqid, &item->event); | ||
| 770 | ssam_event_item_free(item); | ||
| 771 | } while (--iterations); | ||
| 772 | |||
| 773 | if (!ssam_event_queue_is_empty(queue)) | ||
| 774 | ssam_cplt_submit(queue->cplt, &queue->work); | ||
| 775 | } | ||
| 776 | |||
| 777 | /** | ||
| 778 | * ssam_event_queue_init() - Initialize an event queue. | ||
| 779 | * @cplt: The completion system on which the queue resides. | ||
| 780 | * @evq: The event queue to initialize. | ||
| 781 | */ | ||
| 782 | static void ssam_event_queue_init(struct ssam_cplt *cplt, | ||
| 783 | struct ssam_event_queue *evq) | ||
| 784 | { | ||
| 785 | evq->cplt = cplt; | ||
| 786 | spin_lock_init(&evq->lock); | ||
| 787 | INIT_LIST_HEAD(&evq->head); | ||
| 788 | INIT_WORK(&evq->work, ssam_event_queue_work_fn); | ||
| 789 | } | ||
| 790 | |||
| 791 | /** | ||
| 792 | * ssam_cplt_init() - Initialize completion system. | ||
| 793 | * @cplt: The completion system to initialize. | ||
| 794 | * @dev: The device used for logging. | ||
| 795 | */ | ||
| 796 | static int ssam_cplt_init(struct ssam_cplt *cplt, struct device *dev) | ||
| 797 | { | ||
| 798 | struct ssam_event_target *target; | ||
| 799 | int status, c, i; | ||
| 800 | |||
| 801 | cplt->dev = dev; | ||
| 802 | |||
| 803 | cplt->wq = create_workqueue(SSAM_CPLT_WQ_NAME); | ||
| 804 | if (!cplt->wq) | ||
| 805 | return -ENOMEM; | ||
| 806 | |||
| 807 | for (c = 0; c < ARRAY_SIZE(cplt->event.target); c++) { | ||
| 808 | target = &cplt->event.target[c]; | ||
| 809 | |||
| 810 | for (i = 0; i < ARRAY_SIZE(target->queue); i++) | ||
| 811 | ssam_event_queue_init(cplt, &target->queue[i]); | ||
| 812 | } | ||
| 813 | |||
| 814 | status = ssam_nf_init(&cplt->event.notif); | ||
| 815 | if (status) | ||
| 816 | destroy_workqueue(cplt->wq); | ||
| 817 | |||
| 818 | return status; | ||
| 819 | } | ||
| 820 | |||
| 821 | /** | ||
| 822 | * ssam_cplt_destroy() - Deinitialize the completion system. | ||
| 823 | * @cplt: The completion system to deinitialize. | ||
| 824 | * | ||
| 825 | * Deinitialize the given completion system and ensure that all pending, i.e. | ||
| 826 | * yet-to-be-completed, event items and requests have been handled. | ||
| 827 | */ | ||
| 828 | static void ssam_cplt_destroy(struct ssam_cplt *cplt) | ||
| 829 | { | ||
| 830 | /* | ||
| 831 | * Note: destroy_workqueue ensures that all currently queued work will | ||
| 832 | * be fully completed and the workqueue drained. This means that this | ||
| 833 | * call will inherently also free any queued ssam_event_items, thus we | ||
| 834 | * don't have to take care of that here explicitly. | ||
| 835 | */ | ||
| 836 | destroy_workqueue(cplt->wq); | ||
| 837 | ssam_nf_destroy(&cplt->event.notif); | ||
| 838 | } | ||
| 839 | |||
| 840 | |||
| 841 | /* -- Main SSAM device structures. ------------------------------------------ */ | ||
| 842 | |||
| 843 | /** | ||
| 844 | * ssam_controller_device() - Get the &struct device associated with this | ||
| 845 | * controller. | ||
| 846 | * @c: The controller for which to get the device. | ||
| 847 | * | ||
| 848 | * Return: Returns the &struct device associated with this controller, | ||
| 849 | * providing its lower-level transport. | ||
| 850 | */ | ||
| 851 | struct device *ssam_controller_device(struct ssam_controller *c) | ||
| 852 | { | ||
| 853 | return ssh_rtl_get_device(&c->rtl); | ||
| 854 | } | ||
| 855 | EXPORT_SYMBOL_GPL(ssam_controller_device); | ||
| 856 | |||
| 857 | static void __ssam_controller_release(struct kref *kref) | ||
| 858 | { | ||
| 859 | struct ssam_controller *ctrl = to_ssam_controller(kref, kref); | ||
| 860 | |||
| 861 | /* | ||
| 862 | * The lock-call here is to satisfy lockdep. At this point we really | ||
| 863 | * expect this to be the last remaining reference to the controller. | ||
| 864 | * Anything else is a bug. | ||
| 865 | */ | ||
| 866 | ssam_controller_lock(ctrl); | ||
| 867 | ssam_controller_destroy(ctrl); | ||
| 868 | ssam_controller_unlock(ctrl); | ||
| 869 | |||
| 870 | kfree(ctrl); | ||
| 871 | } | ||
| 872 | |||
| 873 | /** | ||
| 874 | * ssam_controller_get() - Increment reference count of controller. | ||
| 875 | * @c: The controller. | ||
| 876 | * | ||
| 877 | * Return: Returns the controller provided as input. | ||
| 878 | */ | ||
| 879 | struct ssam_controller *ssam_controller_get(struct ssam_controller *c) | ||
| 880 | { | ||
| 881 | if (c) | ||
| 882 | kref_get(&c->kref); | ||
| 883 | return c; | ||
| 884 | } | ||
| 885 | EXPORT_SYMBOL_GPL(ssam_controller_get); | ||
| 886 | |||
| 887 | /** | ||
| 888 | * ssam_controller_put() - Decrement reference count of controller. | ||
| 889 | * @c: The controller. | ||
| 890 | */ | ||
| 891 | void ssam_controller_put(struct ssam_controller *c) | ||
| 892 | { | ||
| 893 | if (c) | ||
| 894 | kref_put(&c->kref, __ssam_controller_release); | ||
| 895 | } | ||
| 896 | EXPORT_SYMBOL_GPL(ssam_controller_put); | ||
| 897 | |||
| 898 | /** | ||
| 899 | * ssam_controller_statelock() - Lock the controller against state transitions. | ||
| 900 | * @c: The controller to lock. | ||
| 901 | * | ||
| 902 | * Lock the controller against state transitions. Holding this lock guarantees | ||
| 903 | * that the controller will not transition between states, i.e. if the | ||
| 904 | * controller is in state "started", when this lock has been acquired, it will | ||
| 905 | * remain in this state at least until the lock has been released. | ||
| 906 | * | ||
| 907 | * Multiple clients may concurrently hold this lock. In other words: The | ||
| 908 | * ``statelock`` functions represent the read-lock part of a r/w-semaphore. | ||
| 909 | * Actions causing state transitions of the controller must be executed while | ||
| 910 | * holding the write-part of this r/w-semaphore (see ssam_controller_lock() | ||
| 911 | * and ssam_controller_unlock() for that). | ||
| 912 | * | ||
| 913 | * See ssam_controller_stateunlock() for the corresponding unlock function. | ||
| 914 | */ | ||
| 915 | void ssam_controller_statelock(struct ssam_controller *c) | ||
| 916 | { | ||
| 917 | down_read(&c->lock); | ||
| 918 | } | ||
| 919 | EXPORT_SYMBOL_GPL(ssam_controller_statelock); | ||
| 920 | |||
| 921 | /** | ||
| 922 | * ssam_controller_stateunlock() - Unlock controller state transitions. | ||
| 923 | * @c: The controller to unlock. | ||
| 924 | * | ||
| 925 | * See ssam_controller_statelock() for the corresponding lock function. | ||
| 926 | */ | ||
| 927 | void ssam_controller_stateunlock(struct ssam_controller *c) | ||
| 928 | { | ||
| 929 | up_read(&c->lock); | ||
| 930 | } | ||
| 931 | EXPORT_SYMBOL_GPL(ssam_controller_stateunlock); | ||
| 932 | |||
| 933 | /** | ||
| 934 | * ssam_controller_lock() - Acquire the main controller lock. | ||
| 935 | * @c: The controller to lock. | ||
| 936 | * | ||
| 937 | * This lock must be held for any state transitions, including transition to | ||
| 938 | * suspend/resumed states and during shutdown. See ssam_controller_statelock() | ||
| 939 | * for more details on controller locking. | ||
| 940 | * | ||
| 941 | * See ssam_controller_unlock() for the corresponding unlock function. | ||
| 942 | */ | ||
| 943 | void ssam_controller_lock(struct ssam_controller *c) | ||
| 944 | { | ||
| 945 | down_write(&c->lock); | ||
| 946 | } | ||
| 947 | |||
| 948 | /* | ||
| 949 | * ssam_controller_unlock() - Release the main controller lock. | ||
| 950 | * @c: The controller to unlock. | ||
| 951 | * | ||
| 952 | * See ssam_controller_lock() for the corresponding lock function. | ||
| 953 | */ | ||
| 954 | void ssam_controller_unlock(struct ssam_controller *c) | ||
| 955 | { | ||
| 956 | up_write(&c->lock); | ||
| 957 | } | ||
| 958 | |||
| 959 | static void ssam_handle_event(struct ssh_rtl *rtl, | ||
| 960 | const struct ssh_command *cmd, | ||
| 961 | const struct ssam_span *data) | ||
| 962 | { | ||
| 963 | struct ssam_controller *ctrl = to_ssam_controller(rtl, rtl); | ||
| 964 | struct ssam_event_item *item; | ||
| 965 | |||
| 966 | item = ssam_event_item_alloc(data->len, GFP_KERNEL); | ||
| 967 | if (!item) | ||
| 968 | return; | ||
| 969 | |||
| 970 | item->rqid = get_unaligned_le16(&cmd->rqid); | ||
| 971 | item->event.target_category = cmd->tc; | ||
| 972 | item->event.target_id = cmd->tid_in; | ||
| 973 | item->event.command_id = cmd->cid; | ||
| 974 | item->event.instance_id = cmd->iid; | ||
| 975 | memcpy(&item->event.data[0], data->ptr, data->len); | ||
| 976 | |||
| 977 | if (WARN_ON(ssam_cplt_submit_event(&ctrl->cplt, item))) | ||
| 978 | ssam_event_item_free(item); | ||
| 979 | } | ||
| 980 | |||
| 981 | static const struct ssh_rtl_ops ssam_rtl_ops = { | ||
| 982 | .handle_event = ssam_handle_event, | ||
| 983 | }; | ||
| 984 | |||
| 985 | static bool ssam_notifier_is_empty(struct ssam_controller *ctrl); | ||
| 986 | static void ssam_notifier_unregister_all(struct ssam_controller *ctrl); | ||
| 987 | |||
| 988 | #define SSAM_SSH_DSM_REVISION 0 | ||
| 989 | |||
| 990 | /* d5e383e1-d892-4a76-89fc-f6aaae7ed5b5 */ | ||
| 991 | static const guid_t SSAM_SSH_DSM_GUID = | ||
| 992 | GUID_INIT(0xd5e383e1, 0xd892, 0x4a76, | ||
| 993 | 0x89, 0xfc, 0xf6, 0xaa, 0xae, 0x7e, 0xd5, 0xb5); | ||
| 994 | |||
| 995 | enum ssh_dsm_fn { | ||
| 996 | SSH_DSM_FN_SSH_POWER_PROFILE = 0x05, | ||
| 997 | SSH_DSM_FN_SCREEN_ON_SLEEP_IDLE_TIMEOUT = 0x06, | ||
| 998 | SSH_DSM_FN_SCREEN_OFF_SLEEP_IDLE_TIMEOUT = 0x07, | ||
| 999 | SSH_DSM_FN_D3_CLOSES_HANDLE = 0x08, | ||
| 1000 | SSH_DSM_FN_SSH_BUFFER_SIZE = 0x09, | ||
| 1001 | }; | ||
| 1002 | |||
| 1003 | static int ssam_dsm_get_functions(acpi_handle handle, u64 *funcs) | ||
| 1004 | { | ||
| 1005 | union acpi_object *obj; | ||
| 1006 | u64 mask = 0; | ||
| 1007 | int i; | ||
| 1008 | |||
| 1009 | *funcs = 0; | ||
| 1010 | |||
| 1011 | /* | ||
| 1012 | * The _DSM function is only present on newer models. It is not | ||
| 1013 | * present on 5th and 6th generation devices (i.e. up to and including | ||
| 1014 | * Surface Pro 6, Surface Laptop 2, Surface Book 2). | ||
| 1015 | * | ||
| 1016 | * If the _DSM is not present, indicate that no function is supported. | ||
| 1017 | * This will result in default values being set. | ||
| 1018 | */ | ||
| 1019 | if (!acpi_has_method(handle, "_DSM")) | ||
| 1020 | return 0; | ||
| 1021 | |||
| 1022 | obj = acpi_evaluate_dsm_typed(handle, &SSAM_SSH_DSM_GUID, | ||
| 1023 | SSAM_SSH_DSM_REVISION, 0, NULL, | ||
| 1024 | ACPI_TYPE_BUFFER); | ||
| 1025 | if (!obj) | ||
| 1026 | return -EIO; | ||
| 1027 | |||
| 1028 | for (i = 0; i < obj->buffer.length && i < 8; i++) | ||
| 1029 | mask |= (((u64)obj->buffer.pointer[i]) << (i * 8)); | ||
| 1030 | |||
| 1031 | if (mask & BIT(0)) | ||
| 1032 | *funcs = mask; | ||
| 1033 | |||
| 1034 | ACPI_FREE(obj); | ||
| 1035 | return 0; | ||
| 1036 | } | ||
| 1037 | |||
| 1038 | static int ssam_dsm_load_u32(acpi_handle handle, u64 funcs, u64 func, u32 *ret) | ||
| 1039 | { | ||
| 1040 | union acpi_object *obj; | ||
| 1041 | u64 val; | ||
| 1042 | |||
| 1043 | if (!(funcs & BIT(func))) | ||
| 1044 | return 0; /* Not supported, leave *ret at its default value */ | ||
| 1045 | |||
| 1046 | obj = acpi_evaluate_dsm_typed(handle, &SSAM_SSH_DSM_GUID, | ||
| 1047 | SSAM_SSH_DSM_REVISION, func, NULL, | ||
| 1048 | ACPI_TYPE_INTEGER); | ||
| 1049 | if (!obj) | ||
| 1050 | return -EIO; | ||
| 1051 | |||
| 1052 | val = obj->integer.value; | ||
| 1053 | ACPI_FREE(obj); | ||
| 1054 | |||
| 1055 | if (val > U32_MAX) | ||
| 1056 | return -ERANGE; | ||
| 1057 | |||
| 1058 | *ret = val; | ||
| 1059 | return 0; | ||
| 1060 | } | ||
| 1061 | |||
| 1062 | /** | ||
| 1063 | * ssam_controller_caps_load_from_acpi() - Load controller capabilities from | ||
| 1064 | * ACPI _DSM. | ||
| 1065 | * @handle: The handle of the ACPI controller/SSH device. | ||
| 1066 | * @caps: Where to store the capabilities in. | ||
| 1067 | * | ||
| 1068 | * Initializes the given controller capabilities with default values, then | ||
| 1069 | * checks and, if the respective _DSM functions are available, loads the | ||
| 1070 | * actual capabilities from the _DSM. | ||
| 1071 | * | ||
| 1072 | * Return: Returns zero on success, a negative error code on failure. | ||
| 1073 | */ | ||
| 1074 | static | ||
| 1075 | int ssam_controller_caps_load_from_acpi(acpi_handle handle, | ||
| 1076 | struct ssam_controller_caps *caps) | ||
| 1077 | { | ||
| 1078 | u32 d3_closes_handle = false; | ||
| 1079 | u64 funcs; | ||
| 1080 | int status; | ||
| 1081 | |||
| 1082 | /* Set defaults. */ | ||
| 1083 | caps->ssh_power_profile = U32_MAX; | ||
| 1084 | caps->screen_on_sleep_idle_timeout = U32_MAX; | ||
| 1085 | caps->screen_off_sleep_idle_timeout = U32_MAX; | ||
| 1086 | caps->d3_closes_handle = false; | ||
| 1087 | caps->ssh_buffer_size = U32_MAX; | ||
| 1088 | |||
| 1089 | /* Pre-load supported DSM functions. */ | ||
| 1090 | status = ssam_dsm_get_functions(handle, &funcs); | ||
| 1091 | if (status) | ||
| 1092 | return status; | ||
| 1093 | |||
| 1094 | /* Load actual values from ACPI, if present. */ | ||
| 1095 | status = ssam_dsm_load_u32(handle, funcs, SSH_DSM_FN_SSH_POWER_PROFILE, | ||
| 1096 | &caps->ssh_power_profile); | ||
| 1097 | if (status) | ||
| 1098 | return status; | ||
| 1099 | |||
| 1100 | status = ssam_dsm_load_u32(handle, funcs, | ||
| 1101 | SSH_DSM_FN_SCREEN_ON_SLEEP_IDLE_TIMEOUT, | ||
| 1102 | &caps->screen_on_sleep_idle_timeout); | ||
| 1103 | if (status) | ||
| 1104 | return status; | ||
| 1105 | |||
| 1106 | status = ssam_dsm_load_u32(handle, funcs, | ||
| 1107 | SSH_DSM_FN_SCREEN_OFF_SLEEP_IDLE_TIMEOUT, | ||
| 1108 | &caps->screen_off_sleep_idle_timeout); | ||
| 1109 | if (status) | ||
| 1110 | return status; | ||
| 1111 | |||
| 1112 | status = ssam_dsm_load_u32(handle, funcs, SSH_DSM_FN_D3_CLOSES_HANDLE, | ||
| 1113 | &d3_closes_handle); | ||
| 1114 | if (status) | ||
| 1115 | return status; | ||
| 1116 | |||
| 1117 | caps->d3_closes_handle = !!d3_closes_handle; | ||
| 1118 | |||
| 1119 | status = ssam_dsm_load_u32(handle, funcs, SSH_DSM_FN_SSH_BUFFER_SIZE, | ||
| 1120 | &caps->ssh_buffer_size); | ||
| 1121 | if (status) | ||
| 1122 | return status; | ||
| 1123 | |||
| 1124 | return 0; | ||
| 1125 | } | ||
| 1126 | |||
| 1127 | /** | ||
| 1128 | * ssam_controller_init() - Initialize SSAM controller. | ||
| 1129 | * @ctrl: The controller to initialize. | ||
| 1130 | * @serdev: The serial device representing the underlying data transport. | ||
| 1131 | * | ||
| 1132 | * Initializes the given controller. Does neither start receiver nor | ||
| 1133 | * transmitter threads. After this call, the controller has to be hooked up to | ||
| 1134 | * the serdev core separately via &struct serdev_device_ops, relaying calls to | ||
| 1135 | * ssam_controller_receive_buf() and ssam_controller_write_wakeup(). Once the | ||
| 1136 | * controller has been hooked up, transmitter and receiver threads may be | ||
| 1137 | * started via ssam_controller_start(). These setup steps need to be completed | ||
| 1138 | * before controller can be used for requests. | ||
| 1139 | */ | ||
| 1140 | int ssam_controller_init(struct ssam_controller *ctrl, | ||
| 1141 | struct serdev_device *serdev) | ||
| 1142 | { | ||
| 1143 | acpi_handle handle = ACPI_HANDLE(&serdev->dev); | ||
| 1144 | int status; | ||
| 1145 | |||
| 1146 | init_rwsem(&ctrl->lock); | ||
| 1147 | kref_init(&ctrl->kref); | ||
| 1148 | |||
| 1149 | status = ssam_controller_caps_load_from_acpi(handle, &ctrl->caps); | ||
| 1150 | if (status) | ||
| 1151 | return status; | ||
| 1152 | |||
| 1153 | dev_dbg(&serdev->dev, | ||
| 1154 | "device capabilities:\n" | ||
| 1155 | " ssh_power_profile: %u\n" | ||
| 1156 | " ssh_buffer_size: %u\n" | ||
| 1157 | " screen_on_sleep_idle_timeout: %u\n" | ||
| 1158 | " screen_off_sleep_idle_timeout: %u\n" | ||
| 1159 | " d3_closes_handle: %u\n", | ||
| 1160 | ctrl->caps.ssh_power_profile, | ||
| 1161 | ctrl->caps.ssh_buffer_size, | ||
| 1162 | ctrl->caps.screen_on_sleep_idle_timeout, | ||
| 1163 | ctrl->caps.screen_off_sleep_idle_timeout, | ||
| 1164 | ctrl->caps.d3_closes_handle); | ||
| 1165 | |||
| 1166 | ssh_seq_reset(&ctrl->counter.seq); | ||
| 1167 | ssh_rqid_reset(&ctrl->counter.rqid); | ||
| 1168 | |||
| 1169 | /* Initialize event/request completion system. */ | ||
| 1170 | status = ssam_cplt_init(&ctrl->cplt, &serdev->dev); | ||
| 1171 | if (status) | ||
| 1172 | return status; | ||
| 1173 | |||
| 1174 | /* Initialize request and packet transport layers. */ | ||
| 1175 | status = ssh_rtl_init(&ctrl->rtl, serdev, &ssam_rtl_ops); | ||
| 1176 | if (status) { | ||
| 1177 | ssam_cplt_destroy(&ctrl->cplt); | ||
| 1178 | return status; | ||
| 1179 | } | ||
| 1180 | |||
| 1181 | /* | ||
| 1182 | * Set state via write_once even though we expect to be in an | ||
| 1183 | * exclusive context, due to smoke-testing in | ||
| 1184 | * ssam_request_sync_submit(). | ||
| 1185 | */ | ||
| 1186 | WRITE_ONCE(ctrl->state, SSAM_CONTROLLER_INITIALIZED); | ||
| 1187 | return 0; | ||
| 1188 | } | ||
| 1189 | |||
| 1190 | /** | ||
| 1191 | * ssam_controller_start() - Start the receiver and transmitter threads of the | ||
| 1192 | * controller. | ||
| 1193 | * @ctrl: The controller. | ||
| 1194 | * | ||
| 1195 | * Note: When this function is called, the controller should be properly | ||
| 1196 | * hooked up to the serdev core via &struct serdev_device_ops. Please refer | ||
| 1197 | * to ssam_controller_init() for more details on controller initialization. | ||
| 1198 | * | ||
| 1199 | * This function must be called with the main controller lock held (i.e. by | ||
| 1200 | * calling ssam_controller_lock()). | ||
| 1201 | */ | ||
| 1202 | int ssam_controller_start(struct ssam_controller *ctrl) | ||
| 1203 | { | ||
| 1204 | int status; | ||
| 1205 | |||
| 1206 | lockdep_assert_held_write(&ctrl->lock); | ||
| 1207 | |||
| 1208 | if (ctrl->state != SSAM_CONTROLLER_INITIALIZED) | ||
| 1209 | return -EINVAL; | ||
| 1210 | |||
| 1211 | status = ssh_rtl_start(&ctrl->rtl); | ||
| 1212 | if (status) | ||
| 1213 | return status; | ||
| 1214 | |||
| 1215 | /* | ||
| 1216 | * Set state via write_once even though we expect to be locked/in an | ||
| 1217 | * exclusive context, due to smoke-testing in | ||
| 1218 | * ssam_request_sync_submit(). | ||
| 1219 | */ | ||
| 1220 | WRITE_ONCE(ctrl->state, SSAM_CONTROLLER_STARTED); | ||
| 1221 | return 0; | ||
| 1222 | } | ||
| 1223 | |||
| 1224 | /* | ||
| 1225 | * SSAM_CTRL_SHUTDOWN_FLUSH_TIMEOUT - Timeout for flushing requests during | ||
| 1226 | * shutdown. | ||
| 1227 | * | ||
| 1228 | * Chosen to be larger than one full request timeout, including packets timing | ||
| 1229 | * out. This value should give ample time to complete any outstanding requests | ||
| 1230 | * during normal operation and account for the odd package timeout. | ||
| 1231 | */ | ||
| 1232 | #define SSAM_CTRL_SHUTDOWN_FLUSH_TIMEOUT msecs_to_jiffies(5000) | ||
| 1233 | |||
| 1234 | /** | ||
| 1235 | * ssam_controller_shutdown() - Shut down the controller. | ||
| 1236 | * @ctrl: The controller. | ||
| 1237 | * | ||
| 1238 | * Shuts down the controller by flushing all pending requests and stopping the | ||
| 1239 | * transmitter and receiver threads. All requests submitted after this call | ||
| 1240 | * will fail with %-ESHUTDOWN. While it is discouraged to do so, this function | ||
| 1241 | * is safe to use in parallel with ongoing request submission. | ||
| 1242 | * | ||
| 1243 | * In the course of this shutdown procedure, all currently registered | ||
| 1244 | * notifiers will be unregistered. It is, however, strongly recommended to not | ||
| 1245 | * rely on this behavior, and instead the party registering the notifier | ||
| 1246 | * should unregister it before the controller gets shut down, e.g. via the | ||
| 1247 | * SSAM bus which guarantees client devices to be removed before a shutdown. | ||
| 1248 | * | ||
| 1249 | * Note that events may still be pending after this call, but, due to the | ||
| 1250 | * notifiers being unregistered, these events will be dropped when the | ||
| 1251 | * controller is subsequently destroyed via ssam_controller_destroy(). | ||
| 1252 | * | ||
| 1253 | * This function must be called with the main controller lock held (i.e. by | ||
| 1254 | * calling ssam_controller_lock()). | ||
| 1255 | */ | ||
| 1256 | void ssam_controller_shutdown(struct ssam_controller *ctrl) | ||
| 1257 | { | ||
| 1258 | enum ssam_controller_state s = ctrl->state; | ||
| 1259 | int status; | ||
| 1260 | |||
| 1261 | lockdep_assert_held_write(&ctrl->lock); | ||
| 1262 | |||
| 1263 | if (s == SSAM_CONTROLLER_UNINITIALIZED || s == SSAM_CONTROLLER_STOPPED) | ||
| 1264 | return; | ||
| 1265 | |||
| 1266 | /* | ||
| 1267 | * Try to flush pending events and requests while everything still | ||
| 1268 | * works. Note: There may still be packets and/or requests in the | ||
| 1269 | * system after this call (e.g. via control packets submitted by the | ||
| 1270 | * packet transport layer or flush timeout / failure, ...). Those will | ||
| 1271 | * be handled with the ssh_rtl_shutdown() call below. | ||
| 1272 | */ | ||
| 1273 | status = ssh_rtl_flush(&ctrl->rtl, SSAM_CTRL_SHUTDOWN_FLUSH_TIMEOUT); | ||
| 1274 | if (status) { | ||
| 1275 | ssam_err(ctrl, "failed to flush request transport layer: %d\n", | ||
| 1276 | status); | ||
| 1277 | } | ||
| 1278 | |||
| 1279 | /* Try to flush all currently completing requests and events. */ | ||
| 1280 | ssam_cplt_flush(&ctrl->cplt); | ||
| 1281 | |||
| 1282 | /* | ||
| 1283 | * We expect all notifiers to have been removed by the respective client | ||
| 1284 | * driver that set them up at this point. If this warning occurs, some | ||
| 1285 | * client driver has not done that... | ||
| 1286 | */ | ||
| 1287 | WARN_ON(!ssam_notifier_is_empty(ctrl)); | ||
| 1288 | |||
| 1289 | /* | ||
| 1290 | * Nevertheless, we should still take care of drivers that don't behave | ||
| 1291 | * well. Thus disable all enabled events, unregister all notifiers. | ||
| 1292 | */ | ||
| 1293 | ssam_notifier_unregister_all(ctrl); | ||
| 1294 | |||
| 1295 | /* | ||
| 1296 | * Cancel remaining requests. Ensure no new ones can be queued and stop | ||
| 1297 | * threads. | ||
| 1298 | */ | ||
| 1299 | ssh_rtl_shutdown(&ctrl->rtl); | ||
| 1300 | |||
| 1301 | /* | ||
| 1302 | * Set state via write_once even though we expect to be locked/in an | ||
| 1303 | * exclusive context, due to smoke-testing in | ||
| 1304 | * ssam_request_sync_submit(). | ||
| 1305 | */ | ||
| 1306 | WRITE_ONCE(ctrl->state, SSAM_CONTROLLER_STOPPED); | ||
| 1307 | ctrl->rtl.ptl.serdev = NULL; | ||
| 1308 | } | ||
| 1309 | |||
| 1310 | /** | ||
| 1311 | * ssam_controller_destroy() - Destroy the controller and free its resources. | ||
| 1312 | * @ctrl: The controller. | ||
| 1313 | * | ||
| 1314 | * Ensures that all resources associated with the controller get freed. This | ||
| 1315 | * function should only be called after the controller has been stopped via | ||
| 1316 | * ssam_controller_shutdown(). In general, this function should not be called | ||
| 1317 | * directly. The only valid place to call this function directly is during | ||
| 1318 | * initialization, before the controller has been fully initialized and passed | ||
| 1319 | * to other processes. This function is called automatically when the | ||
| 1320 | * reference count of the controller reaches zero. | ||
| 1321 | * | ||
| 1322 | * This function must be called with the main controller lock held (i.e. by | ||
| 1323 | * calling ssam_controller_lock()). | ||
| 1324 | */ | ||
| 1325 | void ssam_controller_destroy(struct ssam_controller *ctrl) | ||
| 1326 | { | ||
| 1327 | lockdep_assert_held_write(&ctrl->lock); | ||
| 1328 | |||
| 1329 | if (ctrl->state == SSAM_CONTROLLER_UNINITIALIZED) | ||
| 1330 | return; | ||
| 1331 | |||
| 1332 | WARN_ON(ctrl->state != SSAM_CONTROLLER_STOPPED); | ||
| 1333 | |||
| 1334 | /* | ||
| 1335 | * Note: New events could still have been received after the previous | ||
| 1336 | * flush in ssam_controller_shutdown, before the request transport layer | ||
| 1337 | * has been shut down. At this point, after the shutdown, we can be sure | ||
| 1338 | * that no new events will be queued. The call to ssam_cplt_destroy will | ||
| 1339 | * ensure that those remaining are being completed and freed. | ||
| 1340 | */ | ||
| 1341 | |||
| 1342 | /* Actually free resources. */ | ||
| 1343 | ssam_cplt_destroy(&ctrl->cplt); | ||
| 1344 | ssh_rtl_destroy(&ctrl->rtl); | ||
| 1345 | |||
| 1346 | /* | ||
| 1347 | * Set state via write_once even though we expect to be locked/in an | ||
| 1348 | * exclusive context, due to smoke-testing in | ||
| 1349 | * ssam_request_sync_submit(). | ||
| 1350 | */ | ||
| 1351 | WRITE_ONCE(ctrl->state, SSAM_CONTROLLER_UNINITIALIZED); | ||
| 1352 | } | ||
| 1353 | |||
| 1354 | /** | ||
| 1355 | * ssam_controller_suspend() - Suspend the controller. | ||
| 1356 | * @ctrl: The controller to suspend. | ||
| 1357 | * | ||
| 1358 | * Marks the controller as suspended. Note that display-off and D0-exit | ||
| 1359 | * notifications have to be sent manually before transitioning the controller | ||
| 1360 | * into the suspended state via this function. | ||
| 1361 | * | ||
| 1362 | * See ssam_controller_resume() for the corresponding resume function. | ||
| 1363 | * | ||
| 1364 | * Return: Returns %-EINVAL if the controller is currently not in the | ||
| 1365 | * "started" state. | ||
| 1366 | */ | ||
| 1367 | int ssam_controller_suspend(struct ssam_controller *ctrl) | ||
| 1368 | { | ||
| 1369 | ssam_controller_lock(ctrl); | ||
| 1370 | |||
| 1371 | if (ctrl->state != SSAM_CONTROLLER_STARTED) { | ||
| 1372 | ssam_controller_unlock(ctrl); | ||
| 1373 | return -EINVAL; | ||
| 1374 | } | ||
| 1375 | |||
| 1376 | ssam_dbg(ctrl, "pm: suspending controller\n"); | ||
| 1377 | |||
| 1378 | /* | ||
| 1379 | * Set state via write_once even though we're locked, due to | ||
| 1380 | * smoke-testing in ssam_request_sync_submit(). | ||
| 1381 | */ | ||
| 1382 | WRITE_ONCE(ctrl->state, SSAM_CONTROLLER_SUSPENDED); | ||
| 1383 | |||
| 1384 | ssam_controller_unlock(ctrl); | ||
| 1385 | return 0; | ||
| 1386 | } | ||
| 1387 | |||
| 1388 | /** | ||
| 1389 | * ssam_controller_resume() - Resume the controller from suspend. | ||
| 1390 | * @ctrl: The controller to resume. | ||
| 1391 | * | ||
| 1392 | * Resume the controller from the suspended state it was put into via | ||
| 1393 | * ssam_controller_suspend(). This function does not issue display-on and | ||
| 1394 | * D0-entry notifications. If required, those have to be sent manually after | ||
| 1395 | * this call. | ||
| 1396 | * | ||
| 1397 | * Return: Returns %-EINVAL if the controller is currently not suspended. | ||
| 1398 | */ | ||
| 1399 | int ssam_controller_resume(struct ssam_controller *ctrl) | ||
| 1400 | { | ||
| 1401 | ssam_controller_lock(ctrl); | ||
| 1402 | |||
| 1403 | if (ctrl->state != SSAM_CONTROLLER_SUSPENDED) { | ||
| 1404 | ssam_controller_unlock(ctrl); | ||
| 1405 | return -EINVAL; | ||
| 1406 | } | ||
| 1407 | |||
| 1408 | ssam_dbg(ctrl, "pm: resuming controller\n"); | ||
| 1409 | |||
| 1410 | /* | ||
| 1411 | * Set state via write_once even though we're locked, due to | ||
| 1412 | * smoke-testing in ssam_request_sync_submit(). | ||
| 1413 | */ | ||
| 1414 | WRITE_ONCE(ctrl->state, SSAM_CONTROLLER_STARTED); | ||
| 1415 | |||
| 1416 | ssam_controller_unlock(ctrl); | ||
| 1417 | return 0; | ||
| 1418 | } | ||
| 1419 | |||
| 1420 | |||
| 1421 | /* -- Top-level request interface ------------------------------------------- */ | ||
| 1422 | |||
| 1423 | /** | ||
| 1424 | * ssam_request_write_data() - Construct and write SAM request message to | ||
| 1425 | * buffer. | ||
| 1426 | * @buf: The buffer to write the data to. | ||
| 1427 | * @ctrl: The controller via which the request will be sent. | ||
| 1428 | * @spec: The request data and specification. | ||
| 1429 | * | ||
| 1430 | * Constructs a SAM/SSH request message and writes it to the provided buffer. | ||
| 1431 | * The request and transport counters, specifically RQID and SEQ, will be set | ||
| 1432 | * in this call. These counters are obtained from the controller. It is thus | ||
| 1433 | * only valid to send the resulting message via the controller specified here. | ||
| 1434 | * | ||
| 1435 | * For calculation of the required buffer size, refer to the | ||
| 1436 | * SSH_COMMAND_MESSAGE_LENGTH() macro. | ||
| 1437 | * | ||
| 1438 | * Return: Returns the number of bytes used in the buffer on success. Returns | ||
| 1439 | * %-EINVAL if the payload length provided in the request specification is too | ||
| 1440 | * large (larger than %SSH_COMMAND_MAX_PAYLOAD_SIZE) or if the provided buffer | ||
| 1441 | * is too small. | ||
| 1442 | */ | ||
| 1443 | ssize_t ssam_request_write_data(struct ssam_span *buf, | ||
| 1444 | struct ssam_controller *ctrl, | ||
| 1445 | const struct ssam_request *spec) | ||
| 1446 | { | ||
| 1447 | struct msgbuf msgb; | ||
| 1448 | u16 rqid; | ||
| 1449 | u8 seq; | ||
| 1450 | |||
| 1451 | if (spec->length > SSH_COMMAND_MAX_PAYLOAD_SIZE) | ||
| 1452 | return -EINVAL; | ||
| 1453 | |||
| 1454 | if (SSH_COMMAND_MESSAGE_LENGTH(spec->length) > buf->len) | ||
| 1455 | return -EINVAL; | ||
| 1456 | |||
| 1457 | msgb_init(&msgb, buf->ptr, buf->len); | ||
| 1458 | seq = ssh_seq_next(&ctrl->counter.seq); | ||
| 1459 | rqid = ssh_rqid_next(&ctrl->counter.rqid); | ||
| 1460 | msgb_push_cmd(&msgb, seq, rqid, spec); | ||
| 1461 | |||
| 1462 | return msgb_bytes_used(&msgb); | ||
| 1463 | } | ||
| 1464 | EXPORT_SYMBOL_GPL(ssam_request_write_data); | ||
| 1465 | |||
| 1466 | static void ssam_request_sync_complete(struct ssh_request *rqst, | ||
| 1467 | const struct ssh_command *cmd, | ||
| 1468 | const struct ssam_span *data, int status) | ||
| 1469 | { | ||
| 1470 | struct ssh_rtl *rtl = ssh_request_rtl(rqst); | ||
| 1471 | struct ssam_request_sync *r; | ||
| 1472 | |||
| 1473 | r = container_of(rqst, struct ssam_request_sync, base); | ||
| 1474 | r->status = status; | ||
| 1475 | |||
| 1476 | if (r->resp) | ||
| 1477 | r->resp->length = 0; | ||
| 1478 | |||
| 1479 | if (status) { | ||
| 1480 | rtl_dbg_cond(rtl, "rsp: request failed: %d\n", status); | ||
| 1481 | return; | ||
| 1482 | } | ||
| 1483 | |||
| 1484 | if (!data) /* Handle requests without a response. */ | ||
| 1485 | return; | ||
| 1486 | |||
| 1487 | if (!r->resp || !r->resp->pointer) { | ||
| 1488 | if (data->len) | ||
| 1489 | rtl_warn(rtl, "rsp: no response buffer provided, dropping data\n"); | ||
| 1490 | return; | ||
| 1491 | } | ||
| 1492 | |||
| 1493 | if (data->len > r->resp->capacity) { | ||
| 1494 | rtl_err(rtl, | ||
| 1495 | "rsp: response buffer too small, capacity: %zu bytes, got: %zu bytes\n", | ||
| 1496 | r->resp->capacity, data->len); | ||
| 1497 | r->status = -ENOSPC; | ||
| 1498 | return; | ||
| 1499 | } | ||
| 1500 | |||
| 1501 | r->resp->length = data->len; | ||
| 1502 | memcpy(r->resp->pointer, data->ptr, data->len); | ||
| 1503 | } | ||
| 1504 | |||
| 1505 | static void ssam_request_sync_release(struct ssh_request *rqst) | ||
| 1506 | { | ||
| 1507 | complete_all(&container_of(rqst, struct ssam_request_sync, base)->comp); | ||
| 1508 | } | ||
| 1509 | |||
| 1510 | static const struct ssh_request_ops ssam_request_sync_ops = { | ||
| 1511 | .release = ssam_request_sync_release, | ||
| 1512 | .complete = ssam_request_sync_complete, | ||
| 1513 | }; | ||
| 1514 | |||
| 1515 | /** | ||
| 1516 | * ssam_request_sync_alloc() - Allocate a synchronous request. | ||
| 1517 | * @payload_len: The length of the request payload. | ||
| 1518 | * @flags: Flags used for allocation. | ||
| 1519 | * @rqst: Where to store the pointer to the allocated request. | ||
| 1520 | * @buffer: Where to store the buffer descriptor for the message buffer of | ||
| 1521 | * the request. | ||
| 1522 | * | ||
| 1523 | * Allocates a synchronous request with corresponding message buffer. The | ||
| 1524 | * request still needs to be initialized ssam_request_sync_init() before | ||
| 1525 | * it can be submitted, and the message buffer data must still be set to the | ||
| 1526 | * returned buffer via ssam_request_sync_set_data() after it has been filled, | ||
| 1527 | * if need be with adjusted message length. | ||
| 1528 | * | ||
| 1529 | * After use, the request and its corresponding message buffer should be freed | ||
| 1530 | * via ssam_request_sync_free(). The buffer must not be freed separately. | ||
| 1531 | * | ||
| 1532 | * Return: Returns zero on success, %-ENOMEM if the request could not be | ||
| 1533 | * allocated. | ||
| 1534 | */ | ||
| 1535 | int ssam_request_sync_alloc(size_t payload_len, gfp_t flags, | ||
| 1536 | struct ssam_request_sync **rqst, | ||
| 1537 | struct ssam_span *buffer) | ||
| 1538 | { | ||
| 1539 | size_t msglen = SSH_COMMAND_MESSAGE_LENGTH(payload_len); | ||
| 1540 | |||
| 1541 | *rqst = kzalloc(sizeof(**rqst) + msglen, flags); | ||
| 1542 | if (!*rqst) | ||
| 1543 | return -ENOMEM; | ||
| 1544 | |||
| 1545 | buffer->ptr = (u8 *)(*rqst + 1); | ||
| 1546 | buffer->len = msglen; | ||
| 1547 | |||
| 1548 | return 0; | ||
| 1549 | } | ||
| 1550 | EXPORT_SYMBOL_GPL(ssam_request_sync_alloc); | ||
| 1551 | |||
| 1552 | /** | ||
| 1553 | * ssam_request_sync_free() - Free a synchronous request. | ||
| 1554 | * @rqst: The request to be freed. | ||
| 1555 | * | ||
| 1556 | * Free a synchronous request and its corresponding buffer allocated with | ||
| 1557 | * ssam_request_sync_alloc(). Do not use for requests allocated on the stack | ||
| 1558 | * or via any other function. | ||
| 1559 | * | ||
| 1560 | * Warning: The caller must ensure that the request is not in use any more. | ||
| 1561 | * I.e. the caller must ensure that it has the only reference to the request | ||
| 1562 | * and the request is not currently pending. This means that the caller has | ||
| 1563 | * either never submitted the request, request submission has failed, or the | ||
| 1564 | * caller has waited until the submitted request has been completed via | ||
| 1565 | * ssam_request_sync_wait(). | ||
| 1566 | */ | ||
| 1567 | void ssam_request_sync_free(struct ssam_request_sync *rqst) | ||
| 1568 | { | ||
| 1569 | kfree(rqst); | ||
| 1570 | } | ||
| 1571 | EXPORT_SYMBOL_GPL(ssam_request_sync_free); | ||
| 1572 | |||
| 1573 | /** | ||
| 1574 | * ssam_request_sync_init() - Initialize a synchronous request struct. | ||
| 1575 | * @rqst: The request to initialize. | ||
| 1576 | * @flags: The request flags. | ||
| 1577 | * | ||
| 1578 | * Initializes the given request struct. Does not initialize the request | ||
| 1579 | * message data. This has to be done explicitly after this call via | ||
| 1580 | * ssam_request_sync_set_data() and the actual message data has to be written | ||
| 1581 | * via ssam_request_write_data(). | ||
| 1582 | * | ||
| 1583 | * Return: Returns zero on success or %-EINVAL if the given flags are invalid. | ||
| 1584 | */ | ||
| 1585 | int ssam_request_sync_init(struct ssam_request_sync *rqst, | ||
| 1586 | enum ssam_request_flags flags) | ||
| 1587 | { | ||
| 1588 | int status; | ||
| 1589 | |||
| 1590 | status = ssh_request_init(&rqst->base, flags, &ssam_request_sync_ops); | ||
| 1591 | if (status) | ||
| 1592 | return status; | ||
| 1593 | |||
| 1594 | init_completion(&rqst->comp); | ||
| 1595 | rqst->resp = NULL; | ||
| 1596 | rqst->status = 0; | ||
| 1597 | |||
| 1598 | return 0; | ||
| 1599 | } | ||
| 1600 | EXPORT_SYMBOL_GPL(ssam_request_sync_init); | ||
| 1601 | |||
| 1602 | /** | ||
| 1603 | * ssam_request_sync_submit() - Submit a synchronous request. | ||
| 1604 | * @ctrl: The controller with which to submit the request. | ||
| 1605 | * @rqst: The request to submit. | ||
| 1606 | * | ||
| 1607 | * Submit a synchronous request. The request has to be initialized and | ||
| 1608 | * properly set up, including response buffer (may be %NULL if no response is | ||
| 1609 | * expected) and command message data. This function does not wait for the | ||
| 1610 | * request to be completed. | ||
| 1611 | * | ||
| 1612 | * If this function succeeds, ssam_request_sync_wait() must be used to ensure | ||
| 1613 | * that the request has been completed before the response data can be | ||
| 1614 | * accessed and/or the request can be freed. On failure, the request may | ||
| 1615 | * immediately be freed. | ||
| 1616 | * | ||
| 1617 | * This function may only be used if the controller is active, i.e. has been | ||
| 1618 | * initialized and not suspended. | ||
| 1619 | */ | ||
| 1620 | int ssam_request_sync_submit(struct ssam_controller *ctrl, | ||
| 1621 | struct ssam_request_sync *rqst) | ||
| 1622 | { | ||
| 1623 | int status; | ||
| 1624 | |||
| 1625 | /* | ||
| 1626 | * This is only a superficial check. In general, the caller needs to | ||
| 1627 | * ensure that the controller is initialized and is not (and does not | ||
| 1628 | * get) suspended during use, i.e. until the request has been completed | ||
| 1629 | * (if _absolutely_ necessary, by use of ssam_controller_statelock/ | ||
| 1630 | * ssam_controller_stateunlock, but something like ssam_client_link | ||
| 1631 | * should be preferred as this needs to last until the request has been | ||
| 1632 | * completed). | ||
| 1633 | * | ||
| 1634 | * Note that it is actually safe to use this function while the | ||
| 1635 | * controller is in the process of being shut down (as ssh_rtl_submit | ||
| 1636 | * is safe with regards to this), but it is generally discouraged to do | ||
| 1637 | * so. | ||
| 1638 | */ | ||
| 1639 | if (WARN_ON(READ_ONCE(ctrl->state) != SSAM_CONTROLLER_STARTED)) { | ||
| 1640 | ssh_request_put(&rqst->base); | ||
| 1641 | return -ENODEV; | ||
| 1642 | } | ||
| 1643 | |||
| 1644 | status = ssh_rtl_submit(&ctrl->rtl, &rqst->base); | ||
| 1645 | ssh_request_put(&rqst->base); | ||
| 1646 | |||
| 1647 | return status; | ||
| 1648 | } | ||
| 1649 | EXPORT_SYMBOL_GPL(ssam_request_sync_submit); | ||
| 1650 | |||
| 1651 | /** | ||
| 1652 | * ssam_request_sync() - Execute a synchronous request. | ||
| 1653 | * @ctrl: The controller via which the request will be submitted. | ||
| 1654 | * @spec: The request specification and payload. | ||
| 1655 | * @rsp: The response buffer. | ||
| 1656 | * | ||
| 1657 | * Allocates a synchronous request with its message data buffer on the heap | ||
| 1658 | * via ssam_request_sync_alloc(), fully initializes it via the provided | ||
| 1659 | * request specification, submits it, and finally waits for its completion | ||
| 1660 | * before freeing it and returning its status. | ||
| 1661 | * | ||
| 1662 | * Return: Returns the status of the request or any failure during setup. | ||
| 1663 | */ | ||
| 1664 | int ssam_request_sync(struct ssam_controller *ctrl, | ||
| 1665 | const struct ssam_request *spec, | ||
| 1666 | struct ssam_response *rsp) | ||
| 1667 | { | ||
| 1668 | struct ssam_request_sync *rqst; | ||
| 1669 | struct ssam_span buf; | ||
| 1670 | ssize_t len; | ||
| 1671 | int status; | ||
| 1672 | |||
| 1673 | status = ssam_request_sync_alloc(spec->length, GFP_KERNEL, &rqst, &buf); | ||
| 1674 | if (status) | ||
| 1675 | return status; | ||
| 1676 | |||
| 1677 | status = ssam_request_sync_init(rqst, spec->flags); | ||
| 1678 | if (status) | ||
| 1679 | return status; | ||
| 1680 | |||
| 1681 | ssam_request_sync_set_resp(rqst, rsp); | ||
| 1682 | |||
| 1683 | len = ssam_request_write_data(&buf, ctrl, spec); | ||
| 1684 | if (len < 0) { | ||
| 1685 | ssam_request_sync_free(rqst); | ||
| 1686 | return len; | ||
| 1687 | } | ||
| 1688 | |||
| 1689 | ssam_request_sync_set_data(rqst, buf.ptr, len); | ||
| 1690 | |||
| 1691 | status = ssam_request_sync_submit(ctrl, rqst); | ||
| 1692 | if (!status) | ||
| 1693 | status = ssam_request_sync_wait(rqst); | ||
| 1694 | |||
| 1695 | ssam_request_sync_free(rqst); | ||
| 1696 | return status; | ||
| 1697 | } | ||
| 1698 | EXPORT_SYMBOL_GPL(ssam_request_sync); | ||
| 1699 | |||
| 1700 | /** | ||
| 1701 | * ssam_request_sync_with_buffer() - Execute a synchronous request with the | ||
| 1702 | * provided buffer as back-end for the message buffer. | ||
| 1703 | * @ctrl: The controller via which the request will be submitted. | ||
| 1704 | * @spec: The request specification and payload. | ||
| 1705 | * @rsp: The response buffer. | ||
| 1706 | * @buf: The buffer for the request message data. | ||
| 1707 | * | ||
| 1708 | * Allocates a synchronous request struct on the stack, fully initializes it | ||
| 1709 | * using the provided buffer as message data buffer, submits it, and then | ||
| 1710 | * waits for its completion before returning its status. The | ||
| 1711 | * SSH_COMMAND_MESSAGE_LENGTH() macro can be used to compute the required | ||
| 1712 | * message buffer size. | ||
| 1713 | * | ||
| 1714 | * This function does essentially the same as ssam_request_sync(), but instead | ||
| 1715 | * of dynamically allocating the request and message data buffer, it uses the | ||
| 1716 | * provided message data buffer and stores the (small) request struct on the | ||
| 1717 | * heap. | ||
| 1718 | * | ||
| 1719 | * Return: Returns the status of the request or any failure during setup. | ||
| 1720 | */ | ||
| 1721 | int ssam_request_sync_with_buffer(struct ssam_controller *ctrl, | ||
| 1722 | const struct ssam_request *spec, | ||
| 1723 | struct ssam_response *rsp, | ||
| 1724 | struct ssam_span *buf) | ||
| 1725 | { | ||
| 1726 | struct ssam_request_sync rqst; | ||
| 1727 | ssize_t len; | ||
| 1728 | int status; | ||
| 1729 | |||
| 1730 | status = ssam_request_sync_init(&rqst, spec->flags); | ||
| 1731 | if (status) | ||
| 1732 | return status; | ||
| 1733 | |||
| 1734 | ssam_request_sync_set_resp(&rqst, rsp); | ||
| 1735 | |||
| 1736 | len = ssam_request_write_data(buf, ctrl, spec); | ||
| 1737 | if (len < 0) | ||
| 1738 | return len; | ||
| 1739 | |||
| 1740 | ssam_request_sync_set_data(&rqst, buf->ptr, len); | ||
| 1741 | |||
| 1742 | status = ssam_request_sync_submit(ctrl, &rqst); | ||
| 1743 | if (!status) | ||
| 1744 | status = ssam_request_sync_wait(&rqst); | ||
| 1745 | |||
| 1746 | return status; | ||
| 1747 | } | ||
| 1748 | EXPORT_SYMBOL_GPL(ssam_request_sync_with_buffer); | ||
| 1749 | |||
| 1750 | |||
| 1751 | /* -- Internal SAM requests. ------------------------------------------------ */ | ||
| 1752 | |||
| 1753 | static SSAM_DEFINE_SYNC_REQUEST_R(ssam_ssh_get_firmware_version, __le32, { | ||
| 1754 | .target_category = SSAM_SSH_TC_SAM, | ||
| 1755 | .target_id = 0x01, | ||
| 1756 | .command_id = 0x13, | ||
| 1757 | .instance_id = 0x00, | ||
| 1758 | }); | ||
| 1759 | |||
| 1760 | static SSAM_DEFINE_SYNC_REQUEST_R(ssam_ssh_notif_display_off, u8, { | ||
| 1761 | .target_category = SSAM_SSH_TC_SAM, | ||
| 1762 | .target_id = 0x01, | ||
| 1763 | .command_id = 0x15, | ||
| 1764 | .instance_id = 0x00, | ||
| 1765 | }); | ||
| 1766 | |||
| 1767 | static SSAM_DEFINE_SYNC_REQUEST_R(ssam_ssh_notif_display_on, u8, { | ||
| 1768 | .target_category = SSAM_SSH_TC_SAM, | ||
| 1769 | .target_id = 0x01, | ||
| 1770 | .command_id = 0x16, | ||
| 1771 | .instance_id = 0x00, | ||
| 1772 | }); | ||
| 1773 | |||
| 1774 | static SSAM_DEFINE_SYNC_REQUEST_R(ssam_ssh_notif_d0_exit, u8, { | ||
| 1775 | .target_category = SSAM_SSH_TC_SAM, | ||
| 1776 | .target_id = 0x01, | ||
| 1777 | .command_id = 0x33, | ||
| 1778 | .instance_id = 0x00, | ||
| 1779 | }); | ||
| 1780 | |||
| 1781 | static SSAM_DEFINE_SYNC_REQUEST_R(ssam_ssh_notif_d0_entry, u8, { | ||
| 1782 | .target_category = SSAM_SSH_TC_SAM, | ||
| 1783 | .target_id = 0x01, | ||
| 1784 | .command_id = 0x34, | ||
| 1785 | .instance_id = 0x00, | ||
| 1786 | }); | ||
| 1787 | |||
| 1788 | /** | ||
| 1789 | * struct ssh_notification_params - Command payload to enable/disable SSH | ||
| 1790 | * notifications. | ||
| 1791 | * @target_category: The target category for which notifications should be | ||
| 1792 | * enabled/disabled. | ||
| 1793 | * @flags: Flags determining how notifications are being sent. | ||
| 1794 | * @request_id: The request ID that is used to send these notifications. | ||
| 1795 | * @instance_id: The specific instance in the given target category for | ||
| 1796 | * which notifications should be enabled. | ||
| 1797 | */ | ||
| 1798 | struct ssh_notification_params { | ||
| 1799 | u8 target_category; | ||
| 1800 | u8 flags; | ||
| 1801 | __le16 request_id; | ||
| 1802 | u8 instance_id; | ||
| 1803 | } __packed; | ||
| 1804 | |||
| 1805 | static_assert(sizeof(struct ssh_notification_params) == 5); | ||
| 1806 | |||
| 1807 | static int __ssam_ssh_event_request(struct ssam_controller *ctrl, | ||
| 1808 | struct ssam_event_registry reg, u8 cid, | ||
| 1809 | struct ssam_event_id id, u8 flags) | ||
| 1810 | { | ||
| 1811 | struct ssh_notification_params params; | ||
| 1812 | struct ssam_request rqst; | ||
| 1813 | struct ssam_response result; | ||
| 1814 | int status; | ||
| 1815 | |||
| 1816 | u16 rqid = ssh_tc_to_rqid(id.target_category); | ||
| 1817 | u8 buf = 0; | ||
| 1818 | |||
| 1819 | /* Only allow RQIDs that lie within the event spectrum. */ | ||
| 1820 | if (!ssh_rqid_is_event(rqid)) | ||
| 1821 | return -EINVAL; | ||
| 1822 | |||
| 1823 | params.target_category = id.target_category; | ||
| 1824 | params.instance_id = id.instance; | ||
| 1825 | params.flags = flags; | ||
| 1826 | put_unaligned_le16(rqid, ¶ms.request_id); | ||
| 1827 | |||
| 1828 | rqst.target_category = reg.target_category; | ||
| 1829 | rqst.target_id = reg.target_id; | ||
| 1830 | rqst.command_id = cid; | ||
| 1831 | rqst.instance_id = 0x00; | ||
| 1832 | rqst.flags = SSAM_REQUEST_HAS_RESPONSE; | ||
| 1833 | rqst.length = sizeof(params); | ||
| 1834 | rqst.payload = (u8 *)¶ms; | ||
| 1835 | |||
| 1836 | result.capacity = sizeof(buf); | ||
| 1837 | result.length = 0; | ||
| 1838 | result.pointer = &buf; | ||
| 1839 | |||
| 1840 | status = ssam_retry(ssam_request_sync_onstack, ctrl, &rqst, &result, | ||
| 1841 | sizeof(params)); | ||
| 1842 | |||
| 1843 | return status < 0 ? status : buf; | ||
| 1844 | } | ||
| 1845 | |||
| 1846 | /** | ||
| 1847 | * ssam_ssh_event_enable() - Enable SSH event. | ||
| 1848 | * @ctrl: The controller for which to enable the event. | ||
| 1849 | * @reg: The event registry describing what request to use for enabling and | ||
| 1850 | * disabling the event. | ||
| 1851 | * @id: The event identifier. | ||
| 1852 | * @flags: The event flags. | ||
| 1853 | * | ||
| 1854 | * Enables the specified event on the EC. This function does not manage | ||
| 1855 | * reference counting of enabled events and is basically only a wrapper for | ||
| 1856 | * the raw EC request. If the specified event is already enabled, the EC will | ||
| 1857 | * ignore this request. | ||
| 1858 | * | ||
| 1859 | * Return: Returns the status of the executed SAM request (zero on success and | ||
| 1860 | * negative on direct failure) or %-EPROTO if the request response indicates a | ||
| 1861 | * failure. | ||
| 1862 | */ | ||
| 1863 | static int ssam_ssh_event_enable(struct ssam_controller *ctrl, | ||
| 1864 | struct ssam_event_registry reg, | ||
| 1865 | struct ssam_event_id id, u8 flags) | ||
| 1866 | { | ||
| 1867 | int status; | ||
| 1868 | |||
| 1869 | status = __ssam_ssh_event_request(ctrl, reg, reg.cid_enable, id, flags); | ||
| 1870 | |||
| 1871 | if (status < 0 && status != -EINVAL) { | ||
| 1872 | ssam_err(ctrl, | ||
| 1873 | "failed to enable event source (tc: %#04x, iid: %#04x, reg: %#04x)\n", | ||
| 1874 | id.target_category, id.instance, reg.target_category); | ||
| 1875 | } | ||
| 1876 | |||
| 1877 | if (status > 0) { | ||
| 1878 | ssam_err(ctrl, | ||
| 1879 | "unexpected result while enabling event source: %#04x (tc: %#04x, iid: %#04x, reg: %#04x)\n", | ||
| 1880 | status, id.target_category, id.instance, reg.target_category); | ||
| 1881 | return -EPROTO; | ||
| 1882 | } | ||
| 1883 | |||
| 1884 | return status; | ||
| 1885 | } | ||
| 1886 | |||
| 1887 | /** | ||
| 1888 | * ssam_ssh_event_disable() - Disable SSH event. | ||
| 1889 | * @ctrl: The controller for which to disable the event. | ||
| 1890 | * @reg: The event registry describing what request to use for enabling and | ||
| 1891 | * disabling the event (must be same as used when enabling the event). | ||
| 1892 | * @id: The event identifier. | ||
| 1893 | * @flags: The event flags (likely ignored for disabling of events). | ||
| 1894 | * | ||
| 1895 | * Disables the specified event on the EC. This function does not manage | ||
| 1896 | * reference counting of enabled events and is basically only a wrapper for | ||
| 1897 | * the raw EC request. If the specified event is already disabled, the EC will | ||
| 1898 | * ignore this request. | ||
| 1899 | * | ||
| 1900 | * Return: Returns the status of the executed SAM request (zero on success and | ||
| 1901 | * negative on direct failure) or %-EPROTO if the request response indicates a | ||
| 1902 | * failure. | ||
| 1903 | */ | ||
| 1904 | static int ssam_ssh_event_disable(struct ssam_controller *ctrl, | ||
| 1905 | struct ssam_event_registry reg, | ||
| 1906 | struct ssam_event_id id, u8 flags) | ||
| 1907 | { | ||
| 1908 | int status; | ||
| 1909 | |||
| 1910 | status = __ssam_ssh_event_request(ctrl, reg, reg.cid_enable, id, flags); | ||
| 1911 | |||
| 1912 | if (status < 0 && status != -EINVAL) { | ||
| 1913 | ssam_err(ctrl, | ||
| 1914 | "failed to disable event source (tc: %#04x, iid: %#04x, reg: %#04x)\n", | ||
| 1915 | id.target_category, id.instance, reg.target_category); | ||
| 1916 | } | ||
| 1917 | |||
| 1918 | if (status > 0) { | ||
| 1919 | ssam_err(ctrl, | ||
| 1920 | "unexpected result while disabling event source: %#04x (tc: %#04x, iid: %#04x, reg: %#04x)\n", | ||
| 1921 | status, id.target_category, id.instance, reg.target_category); | ||
| 1922 | return -EPROTO; | ||
| 1923 | } | ||
| 1924 | |||
| 1925 | return status; | ||
| 1926 | } | ||
| 1927 | |||
| 1928 | |||
| 1929 | /* -- Wrappers for internal SAM requests. ----------------------------------- */ | ||
| 1930 | |||
| 1931 | /** | ||
| 1932 | * ssam_get_firmware_version() - Get the SAM/EC firmware version. | ||
| 1933 | * @ctrl: The controller. | ||
| 1934 | * @version: Where to store the version number. | ||
| 1935 | * | ||
| 1936 | * Return: Returns zero on success or the status of the executed SAM request | ||
| 1937 | * if that request failed. | ||
| 1938 | */ | ||
| 1939 | int ssam_get_firmware_version(struct ssam_controller *ctrl, u32 *version) | ||
| 1940 | { | ||
| 1941 | __le32 __version; | ||
| 1942 | int status; | ||
| 1943 | |||
| 1944 | status = ssam_retry(ssam_ssh_get_firmware_version, ctrl, &__version); | ||
| 1945 | if (status) | ||
| 1946 | return status; | ||
| 1947 | |||
| 1948 | *version = le32_to_cpu(__version); | ||
| 1949 | return 0; | ||
| 1950 | } | ||
| 1951 | |||
| 1952 | /** | ||
| 1953 | * ssam_ctrl_notif_display_off() - Notify EC that the display has been turned | ||
| 1954 | * off. | ||
| 1955 | * @ctrl: The controller. | ||
| 1956 | * | ||
| 1957 | * Notify the EC that the display has been turned off and the driver may enter | ||
| 1958 | * a lower-power state. This will prevent events from being sent directly. | ||
| 1959 | * Rather, the EC signals an event by pulling the wakeup GPIO high for as long | ||
| 1960 | * as there are pending events. The events then need to be manually released, | ||
| 1961 | * one by one, via the GPIO callback request. All pending events accumulated | ||
| 1962 | * during this state can also be released by issuing the display-on | ||
| 1963 | * notification, e.g. via ssam_ctrl_notif_display_on(), which will also reset | ||
| 1964 | * the GPIO. | ||
| 1965 | * | ||
| 1966 | * On some devices, specifically ones with an integrated keyboard, the keyboard | ||
| 1967 | * backlight will be turned off by this call. | ||
| 1968 | * | ||
| 1969 | * This function will only send the display-off notification command if | ||
| 1970 | * display notifications are supported by the EC. Currently all known devices | ||
| 1971 | * support these notifications. | ||
| 1972 | * | ||
| 1973 | * Use ssam_ctrl_notif_display_on() to reverse the effects of this function. | ||
| 1974 | * | ||
| 1975 | * Return: Returns zero on success or if no request has been executed, the | ||
| 1976 | * status of the executed SAM request if that request failed, or %-EPROTO if | ||
| 1977 | * an unexpected response has been received. | ||
| 1978 | */ | ||
| 1979 | int ssam_ctrl_notif_display_off(struct ssam_controller *ctrl) | ||
| 1980 | { | ||
| 1981 | int status; | ||
| 1982 | u8 response; | ||
| 1983 | |||
| 1984 | ssam_dbg(ctrl, "pm: notifying display off\n"); | ||
| 1985 | |||
| 1986 | status = ssam_retry(ssam_ssh_notif_display_off, ctrl, &response); | ||
| 1987 | if (status) | ||
| 1988 | return status; | ||
| 1989 | |||
| 1990 | if (response != 0) { | ||
| 1991 | ssam_err(ctrl, "unexpected response from display-off notification: %#04x\n", | ||
| 1992 | response); | ||
| 1993 | return -EPROTO; | ||
| 1994 | } | ||
| 1995 | |||
| 1996 | return 0; | ||
| 1997 | } | ||
| 1998 | |||
| 1999 | /** | ||
| 2000 | * ssam_ctrl_notif_display_on() - Notify EC that the display has been turned on. | ||
| 2001 | * @ctrl: The controller. | ||
| 2002 | * | ||
| 2003 | * Notify the EC that the display has been turned back on and the driver has | ||
| 2004 | * exited its lower-power state. This notification is the counterpart to the | ||
| 2005 | * display-off notification sent via ssam_ctrl_notif_display_off() and will | ||
| 2006 | * reverse its effects, including resetting events to their default behavior. | ||
| 2007 | * | ||
| 2008 | * This function will only send the display-on notification command if display | ||
| 2009 | * notifications are supported by the EC. Currently all known devices support | ||
| 2010 | * these notifications. | ||
| 2011 | * | ||
| 2012 | * See ssam_ctrl_notif_display_off() for more details. | ||
| 2013 | * | ||
| 2014 | * Return: Returns zero on success or if no request has been executed, the | ||
| 2015 | * status of the executed SAM request if that request failed, or %-EPROTO if | ||
| 2016 | * an unexpected response has been received. | ||
| 2017 | */ | ||
| 2018 | int ssam_ctrl_notif_display_on(struct ssam_controller *ctrl) | ||
| 2019 | { | ||
| 2020 | int status; | ||
| 2021 | u8 response; | ||
| 2022 | |||
| 2023 | ssam_dbg(ctrl, "pm: notifying display on\n"); | ||
| 2024 | |||
| 2025 | status = ssam_retry(ssam_ssh_notif_display_on, ctrl, &response); | ||
| 2026 | if (status) | ||
| 2027 | return status; | ||
| 2028 | |||
| 2029 | if (response != 0) { | ||
| 2030 | ssam_err(ctrl, "unexpected response from display-on notification: %#04x\n", | ||
| 2031 | response); | ||
| 2032 | return -EPROTO; | ||
| 2033 | } | ||
| 2034 | |||
| 2035 | return 0; | ||
| 2036 | } | ||
| 2037 | |||
| 2038 | /** | ||
| 2039 | * ssam_ctrl_notif_d0_exit() - Notify EC that the driver/device exits the D0 | ||
| 2040 | * power state. | ||
| 2041 | * @ctrl: The controller | ||
| 2042 | * | ||
| 2043 | * Notifies the EC that the driver prepares to exit the D0 power state in | ||
| 2044 | * favor of a lower-power state. Exact effects of this function related to the | ||
| 2045 | * EC are currently unknown. | ||
| 2046 | * | ||
| 2047 | * This function will only send the D0-exit notification command if D0-state | ||
| 2048 | * notifications are supported by the EC. Only newer Surface generations | ||
| 2049 | * support these notifications. | ||
| 2050 | * | ||
| 2051 | * Use ssam_ctrl_notif_d0_entry() to reverse the effects of this function. | ||
| 2052 | * | ||
| 2053 | * Return: Returns zero on success or if no request has been executed, the | ||
| 2054 | * status of the executed SAM request if that request failed, or %-EPROTO if | ||
| 2055 | * an unexpected response has been received. | ||
| 2056 | */ | ||
| 2057 | int ssam_ctrl_notif_d0_exit(struct ssam_controller *ctrl) | ||
| 2058 | { | ||
| 2059 | int status; | ||
| 2060 | u8 response; | ||
| 2061 | |||
| 2062 | if (!ctrl->caps.d3_closes_handle) | ||
| 2063 | return 0; | ||
| 2064 | |||
| 2065 | ssam_dbg(ctrl, "pm: notifying D0 exit\n"); | ||
| 2066 | |||
| 2067 | status = ssam_retry(ssam_ssh_notif_d0_exit, ctrl, &response); | ||
| 2068 | if (status) | ||
| 2069 | return status; | ||
| 2070 | |||
| 2071 | if (response != 0) { | ||
| 2072 | ssam_err(ctrl, "unexpected response from D0-exit notification: %#04x\n", | ||
| 2073 | response); | ||
| 2074 | return -EPROTO; | ||
| 2075 | } | ||
| 2076 | |||
| 2077 | return 0; | ||
| 2078 | } | ||
| 2079 | |||
| 2080 | /** | ||
| 2081 | * ssam_ctrl_notif_d0_entry() - Notify EC that the driver/device enters the D0 | ||
| 2082 | * power state. | ||
| 2083 | * @ctrl: The controller | ||
| 2084 | * | ||
| 2085 | * Notifies the EC that the driver has exited a lower-power state and entered | ||
| 2086 | * the D0 power state. Exact effects of this function related to the EC are | ||
| 2087 | * currently unknown. | ||
| 2088 | * | ||
| 2089 | * This function will only send the D0-entry notification command if D0-state | ||
| 2090 | * notifications are supported by the EC. Only newer Surface generations | ||
| 2091 | * support these notifications. | ||
| 2092 | * | ||
| 2093 | * See ssam_ctrl_notif_d0_exit() for more details. | ||
| 2094 | * | ||
| 2095 | * Return: Returns zero on success or if no request has been executed, the | ||
| 2096 | * status of the executed SAM request if that request failed, or %-EPROTO if | ||
| 2097 | * an unexpected response has been received. | ||
| 2098 | */ | ||
| 2099 | int ssam_ctrl_notif_d0_entry(struct ssam_controller *ctrl) | ||
| 2100 | { | ||
| 2101 | int status; | ||
| 2102 | u8 response; | ||
| 2103 | |||
| 2104 | if (!ctrl->caps.d3_closes_handle) | ||
| 2105 | return 0; | ||
| 2106 | |||
| 2107 | ssam_dbg(ctrl, "pm: notifying D0 entry\n"); | ||
| 2108 | |||
| 2109 | status = ssam_retry(ssam_ssh_notif_d0_entry, ctrl, &response); | ||
| 2110 | if (status) | ||
| 2111 | return status; | ||
| 2112 | |||
| 2113 | if (response != 0) { | ||
| 2114 | ssam_err(ctrl, "unexpected response from D0-entry notification: %#04x\n", | ||
| 2115 | response); | ||
| 2116 | return -EPROTO; | ||
| 2117 | } | ||
| 2118 | |||
| 2119 | return 0; | ||
| 2120 | } | ||
| 2121 | |||
| 2122 | |||
| 2123 | /* -- Top-level event registry interface. ----------------------------------- */ | ||
| 2124 | |||
| 2125 | /** | ||
| 2126 | * ssam_notifier_register() - Register an event notifier. | ||
| 2127 | * @ctrl: The controller to register the notifier on. | ||
| 2128 | * @n: The event notifier to register. | ||
| 2129 | * | ||
| 2130 | * Register an event notifier and increment the usage counter of the | ||
| 2131 | * associated SAM event. If the event was previously not enabled, it will be | ||
| 2132 | * enabled during this call. | ||
| 2133 | * | ||
| 2134 | * Return: Returns zero on success, %-ENOSPC if there have already been | ||
| 2135 | * %INT_MAX notifiers for the event ID/type associated with the notifier block | ||
| 2136 | * registered, %-ENOMEM if the corresponding event entry could not be | ||
| 2137 | * allocated. If this is the first time that a notifier block is registered | ||
| 2138 | * for the specific associated event, returns the status of the event-enable | ||
| 2139 | * EC-command. | ||
| 2140 | */ | ||
| 2141 | int ssam_notifier_register(struct ssam_controller *ctrl, | ||
| 2142 | struct ssam_event_notifier *n) | ||
| 2143 | { | ||
| 2144 | u16 rqid = ssh_tc_to_rqid(n->event.id.target_category); | ||
| 2145 | struct ssam_nf_refcount_entry *entry; | ||
| 2146 | struct ssam_nf_head *nf_head; | ||
| 2147 | struct ssam_nf *nf; | ||
| 2148 | int status; | ||
| 2149 | |||
| 2150 | if (!ssh_rqid_is_event(rqid)) | ||
| 2151 | return -EINVAL; | ||
| 2152 | |||
| 2153 | nf = &ctrl->cplt.event.notif; | ||
| 2154 | nf_head = &nf->head[ssh_rqid_to_event(rqid)]; | ||
| 2155 | |||
| 2156 | mutex_lock(&nf->lock); | ||
| 2157 | |||
| 2158 | entry = ssam_nf_refcount_inc(nf, n->event.reg, n->event.id); | ||
| 2159 | if (IS_ERR(entry)) { | ||
| 2160 | mutex_unlock(&nf->lock); | ||
| 2161 | return PTR_ERR(entry); | ||
| 2162 | } | ||
| 2163 | |||
| 2164 | ssam_dbg(ctrl, "enabling event (reg: %#04x, tc: %#04x, iid: %#04x, rc: %d)\n", | ||
| 2165 | n->event.reg.target_category, n->event.id.target_category, | ||
| 2166 | n->event.id.instance, entry->refcount); | ||
| 2167 | |||
| 2168 | status = ssam_nfblk_insert(nf_head, &n->base); | ||
| 2169 | if (status) { | ||
| 2170 | entry = ssam_nf_refcount_dec(nf, n->event.reg, n->event.id); | ||
| 2171 | if (entry->refcount == 0) | ||
| 2172 | kfree(entry); | ||
| 2173 | |||
| 2174 | mutex_unlock(&nf->lock); | ||
| 2175 | return status; | ||
| 2176 | } | ||
| 2177 | |||
| 2178 | if (entry->refcount == 1) { | ||
| 2179 | status = ssam_ssh_event_enable(ctrl, n->event.reg, n->event.id, | ||
| 2180 | n->event.flags); | ||
| 2181 | if (status) { | ||
| 2182 | ssam_nfblk_remove(&n->base); | ||
| 2183 | kfree(ssam_nf_refcount_dec(nf, n->event.reg, n->event.id)); | ||
| 2184 | mutex_unlock(&nf->lock); | ||
| 2185 | synchronize_srcu(&nf_head->srcu); | ||
| 2186 | return status; | ||
| 2187 | } | ||
| 2188 | |||
| 2189 | entry->flags = n->event.flags; | ||
| 2190 | |||
| 2191 | } else if (entry->flags != n->event.flags) { | ||
| 2192 | ssam_warn(ctrl, | ||
| 2193 | "inconsistent flags when enabling event: got %#04x, expected %#04x (reg: %#04x, tc: %#04x, iid: %#04x)\n", | ||
| 2194 | n->event.flags, entry->flags, n->event.reg.target_category, | ||
| 2195 | n->event.id.target_category, n->event.id.instance); | ||
| 2196 | } | ||
| 2197 | |||
| 2198 | mutex_unlock(&nf->lock); | ||
| 2199 | return 0; | ||
| 2200 | } | ||
| 2201 | EXPORT_SYMBOL_GPL(ssam_notifier_register); | ||
| 2202 | |||
| 2203 | /** | ||
| 2204 | * ssam_notifier_unregister() - Unregister an event notifier. | ||
| 2205 | * @ctrl: The controller the notifier has been registered on. | ||
| 2206 | * @n: The event notifier to unregister. | ||
| 2207 | * | ||
| 2208 | * Unregister an event notifier and decrement the usage counter of the | ||
| 2209 | * associated SAM event. If the usage counter reaches zero, the event will be | ||
| 2210 | * disabled. | ||
| 2211 | * | ||
| 2212 | * Return: Returns zero on success, %-ENOENT if the given notifier block has | ||
| 2213 | * not been registered on the controller. If the given notifier block was the | ||
| 2214 | * last one associated with its specific event, returns the status of the | ||
| 2215 | * event-disable EC-command. | ||
| 2216 | */ | ||
| 2217 | int ssam_notifier_unregister(struct ssam_controller *ctrl, | ||
| 2218 | struct ssam_event_notifier *n) | ||
| 2219 | { | ||
| 2220 | u16 rqid = ssh_tc_to_rqid(n->event.id.target_category); | ||
| 2221 | struct ssam_nf_refcount_entry *entry; | ||
| 2222 | struct ssam_nf_head *nf_head; | ||
| 2223 | struct ssam_nf *nf; | ||
| 2224 | int status = 0; | ||
| 2225 | |||
| 2226 | if (!ssh_rqid_is_event(rqid)) | ||
| 2227 | return -EINVAL; | ||
| 2228 | |||
| 2229 | nf = &ctrl->cplt.event.notif; | ||
| 2230 | nf_head = &nf->head[ssh_rqid_to_event(rqid)]; | ||
| 2231 | |||
| 2232 | mutex_lock(&nf->lock); | ||
| 2233 | |||
| 2234 | if (!ssam_nfblk_find(nf_head, &n->base)) { | ||
| 2235 | mutex_unlock(&nf->lock); | ||
| 2236 | return -ENOENT; | ||
| 2237 | } | ||
| 2238 | |||
| 2239 | entry = ssam_nf_refcount_dec(nf, n->event.reg, n->event.id); | ||
| 2240 | if (WARN_ON(!entry)) { | ||
| 2241 | /* | ||
| 2242 | * If this does not return an entry, there's a logic error | ||
| 2243 | * somewhere: The notifier block is registered, but the event | ||
| 2244 | * refcount entry is not there. Remove the notifier block | ||
| 2245 | * anyways. | ||
| 2246 | */ | ||
| 2247 | status = -ENOENT; | ||
| 2248 | goto remove; | ||
| 2249 | } | ||
| 2250 | |||
| 2251 | ssam_dbg(ctrl, "disabling event (reg: %#04x, tc: %#04x, iid: %#04x, rc: %d)\n", | ||
| 2252 | n->event.reg.target_category, n->event.id.target_category, | ||
| 2253 | n->event.id.instance, entry->refcount); | ||
| 2254 | |||
| 2255 | if (entry->flags != n->event.flags) { | ||
| 2256 | ssam_warn(ctrl, | ||
| 2257 | "inconsistent flags when disabling event: got %#04x, expected %#04x (reg: %#04x, tc: %#04x, iid: %#04x)\n", | ||
| 2258 | n->event.flags, entry->flags, n->event.reg.target_category, | ||
| 2259 | n->event.id.target_category, n->event.id.instance); | ||
| 2260 | } | ||
| 2261 | |||
| 2262 | if (entry->refcount == 0) { | ||
| 2263 | status = ssam_ssh_event_disable(ctrl, n->event.reg, n->event.id, | ||
| 2264 | n->event.flags); | ||
| 2265 | kfree(entry); | ||
| 2266 | } | ||
| 2267 | |||
| 2268 | remove: | ||
| 2269 | ssam_nfblk_remove(&n->base); | ||
| 2270 | mutex_unlock(&nf->lock); | ||
| 2271 | synchronize_srcu(&nf_head->srcu); | ||
| 2272 | |||
| 2273 | return status; | ||
| 2274 | } | ||
| 2275 | EXPORT_SYMBOL_GPL(ssam_notifier_unregister); | ||
| 2276 | |||
| 2277 | /** | ||
| 2278 | * ssam_notifier_disable_registered() - Disable events for all registered | ||
| 2279 | * notifiers. | ||
| 2280 | * @ctrl: The controller for which to disable the notifiers/events. | ||
| 2281 | * | ||
| 2282 | * Disables events for all currently registered notifiers. In case of an error | ||
| 2283 | * (EC command failing), all previously disabled events will be restored and | ||
| 2284 | * the error code returned. | ||
| 2285 | * | ||
| 2286 | * This function is intended to disable all events prior to hibernation entry. | ||
| 2287 | * See ssam_notifier_restore_registered() to restore/re-enable all events | ||
| 2288 | * disabled with this function. | ||
| 2289 | * | ||
| 2290 | * Note that this function will not disable events for notifiers registered | ||
| 2291 | * after calling this function. It should thus be made sure that no new | ||
| 2292 | * notifiers are going to be added after this call and before the corresponding | ||
| 2293 | * call to ssam_notifier_restore_registered(). | ||
| 2294 | * | ||
| 2295 | * Return: Returns zero on success. In case of failure returns the error code | ||
| 2296 | * returned by the failed EC command to disable an event. | ||
| 2297 | */ | ||
| 2298 | int ssam_notifier_disable_registered(struct ssam_controller *ctrl) | ||
| 2299 | { | ||
| 2300 | struct ssam_nf *nf = &ctrl->cplt.event.notif; | ||
| 2301 | struct rb_node *n; | ||
| 2302 | int status; | ||
| 2303 | |||
| 2304 | mutex_lock(&nf->lock); | ||
| 2305 | for (n = rb_first(&nf->refcount); n; n = rb_next(n)) { | ||
| 2306 | struct ssam_nf_refcount_entry *e; | ||
| 2307 | |||
| 2308 | e = rb_entry(n, struct ssam_nf_refcount_entry, node); | ||
| 2309 | status = ssam_ssh_event_disable(ctrl, e->key.reg, | ||
| 2310 | e->key.id, e->flags); | ||
| 2311 | if (status) | ||
| 2312 | goto err; | ||
| 2313 | } | ||
| 2314 | mutex_unlock(&nf->lock); | ||
| 2315 | |||
| 2316 | return 0; | ||
| 2317 | |||
| 2318 | err: | ||
| 2319 | for (n = rb_prev(n); n; n = rb_prev(n)) { | ||
| 2320 | struct ssam_nf_refcount_entry *e; | ||
| 2321 | |||
| 2322 | e = rb_entry(n, struct ssam_nf_refcount_entry, node); | ||
| 2323 | ssam_ssh_event_enable(ctrl, e->key.reg, e->key.id, e->flags); | ||
| 2324 | } | ||
| 2325 | mutex_unlock(&nf->lock); | ||
| 2326 | |||
| 2327 | return status; | ||
| 2328 | } | ||
| 2329 | |||
| 2330 | /** | ||
| 2331 | * ssam_notifier_restore_registered() - Restore/re-enable events for all | ||
| 2332 | * registered notifiers. | ||
| 2333 | * @ctrl: The controller for which to restore the notifiers/events. | ||
| 2334 | * | ||
| 2335 | * Restores/re-enables all events for which notifiers have been registered on | ||
| 2336 | * the given controller. In case of a failure, the error is logged and the | ||
| 2337 | * function continues to try and enable the remaining events. | ||
| 2338 | * | ||
| 2339 | * This function is intended to restore/re-enable all registered events after | ||
| 2340 | * hibernation. See ssam_notifier_disable_registered() for the counter part | ||
| 2341 | * disabling the events and more details. | ||
| 2342 | */ | ||
| 2343 | void ssam_notifier_restore_registered(struct ssam_controller *ctrl) | ||
| 2344 | { | ||
| 2345 | struct ssam_nf *nf = &ctrl->cplt.event.notif; | ||
| 2346 | struct rb_node *n; | ||
| 2347 | |||
| 2348 | mutex_lock(&nf->lock); | ||
| 2349 | for (n = rb_first(&nf->refcount); n; n = rb_next(n)) { | ||
| 2350 | struct ssam_nf_refcount_entry *e; | ||
| 2351 | |||
| 2352 | e = rb_entry(n, struct ssam_nf_refcount_entry, node); | ||
| 2353 | |||
| 2354 | /* Ignore errors, will get logged in call. */ | ||
| 2355 | ssam_ssh_event_enable(ctrl, e->key.reg, e->key.id, e->flags); | ||
| 2356 | } | ||
| 2357 | mutex_unlock(&nf->lock); | ||
| 2358 | } | ||
| 2359 | |||
| 2360 | /** | ||
| 2361 | * ssam_notifier_is_empty() - Check if there are any registered notifiers. | ||
| 2362 | * @ctrl: The controller to check on. | ||
| 2363 | * | ||
| 2364 | * Return: Returns %true if there are currently no notifiers registered on the | ||
| 2365 | * controller, %false otherwise. | ||
| 2366 | */ | ||
| 2367 | static bool ssam_notifier_is_empty(struct ssam_controller *ctrl) | ||
| 2368 | { | ||
| 2369 | struct ssam_nf *nf = &ctrl->cplt.event.notif; | ||
| 2370 | bool result; | ||
| 2371 | |||
| 2372 | mutex_lock(&nf->lock); | ||
| 2373 | result = ssam_nf_refcount_empty(nf); | ||
| 2374 | mutex_unlock(&nf->lock); | ||
| 2375 | |||
| 2376 | return result; | ||
| 2377 | } | ||
| 2378 | |||
| 2379 | /** | ||
| 2380 | * ssam_notifier_unregister_all() - Unregister all currently registered | ||
| 2381 | * notifiers. | ||
| 2382 | * @ctrl: The controller to unregister the notifiers on. | ||
| 2383 | * | ||
| 2384 | * Unregisters all currently registered notifiers. This function is used to | ||
| 2385 | * ensure that all notifiers will be unregistered and associated | ||
| 2386 | * entries/resources freed when the controller is being shut down. | ||
| 2387 | */ | ||
| 2388 | static void ssam_notifier_unregister_all(struct ssam_controller *ctrl) | ||
| 2389 | { | ||
| 2390 | struct ssam_nf *nf = &ctrl->cplt.event.notif; | ||
| 2391 | struct ssam_nf_refcount_entry *e, *n; | ||
| 2392 | |||
| 2393 | mutex_lock(&nf->lock); | ||
| 2394 | rbtree_postorder_for_each_entry_safe(e, n, &nf->refcount, node) { | ||
| 2395 | /* Ignore errors, will get logged in call. */ | ||
| 2396 | ssam_ssh_event_disable(ctrl, e->key.reg, e->key.id, e->flags); | ||
| 2397 | kfree(e); | ||
| 2398 | } | ||
| 2399 | nf->refcount = RB_ROOT; | ||
| 2400 | mutex_unlock(&nf->lock); | ||
| 2401 | } | ||
| 2402 | |||
| 2403 | |||
| 2404 | /* -- Wakeup IRQ. ----------------------------------------------------------- */ | ||
| 2405 | |||
| 2406 | static irqreturn_t ssam_irq_handle(int irq, void *dev_id) | ||
| 2407 | { | ||
| 2408 | struct ssam_controller *ctrl = dev_id; | ||
| 2409 | |||
| 2410 | ssam_dbg(ctrl, "pm: wake irq triggered\n"); | ||
| 2411 | |||
| 2412 | /* | ||
| 2413 | * Note: Proper wakeup detection is currently unimplemented. | ||
| 2414 | * When the EC is in display-off or any other non-D0 state, it | ||
| 2415 | * does not send events/notifications to the host. Instead it | ||
| 2416 | * signals that there are events available via the wakeup IRQ. | ||
| 2417 | * This driver is responsible for calling back to the EC to | ||
| 2418 | * release these events one-by-one. | ||
| 2419 | * | ||
| 2420 | * This IRQ should not cause a full system resume by its own. | ||
| 2421 | * Instead, events should be handled by their respective subsystem | ||
| 2422 | * drivers, which in turn should signal whether a full system | ||
| 2423 | * resume should be performed. | ||
| 2424 | * | ||
| 2425 | * TODO: Send GPIO callback command repeatedly to EC until callback | ||
| 2426 | * returns 0x00. Return flag of callback is "has more events". | ||
| 2427 | * Each time the command is sent, one event is "released". Once | ||
| 2428 | * all events have been released (return = 0x00), the GPIO is | ||
| 2429 | * re-armed. Detect wakeup events during this process, go back to | ||
| 2430 | * sleep if no wakeup event has been received. | ||
| 2431 | */ | ||
| 2432 | |||
| 2433 | return IRQ_HANDLED; | ||
| 2434 | } | ||
| 2435 | |||
| 2436 | /** | ||
| 2437 | * ssam_irq_setup() - Set up SAM EC wakeup-GPIO interrupt. | ||
| 2438 | * @ctrl: The controller for which the IRQ should be set up. | ||
| 2439 | * | ||
| 2440 | * Set up an IRQ for the wakeup-GPIO pin of the SAM EC. This IRQ can be used | ||
| 2441 | * to wake the device from a low power state. | ||
| 2442 | * | ||
| 2443 | * Note that this IRQ can only be triggered while the EC is in the display-off | ||
| 2444 | * state. In this state, events are not sent to the host in the usual way. | ||
| 2445 | * Instead the wakeup-GPIO gets pulled to "high" as long as there are pending | ||
| 2446 | * events and these events need to be released one-by-one via the GPIO | ||
| 2447 | * callback request, either until there are no events left and the GPIO is | ||
| 2448 | * reset, or all at once by transitioning the EC out of the display-off state, | ||
| 2449 | * which will also clear the GPIO. | ||
| 2450 | * | ||
| 2451 | * Not all events, however, should trigger a full system wakeup. Instead the | ||
| 2452 | * driver should, if necessary, inspect and forward each event to the | ||
| 2453 | * corresponding subsystem, which in turn should decide if the system needs to | ||
| 2454 | * be woken up. This logic has not been implemented yet, thus wakeup by this | ||
| 2455 | * IRQ should be disabled by default to avoid spurious wake-ups, caused, for | ||
| 2456 | * example, by the remaining battery percentage changing. Refer to comments in | ||
| 2457 | * this function and comments in the corresponding IRQ handler for more | ||
| 2458 | * details on how this should be implemented. | ||
| 2459 | * | ||
| 2460 | * See also ssam_ctrl_notif_display_off() and ssam_ctrl_notif_display_off() | ||
| 2461 | * for functions to transition the EC into and out of the display-off state as | ||
| 2462 | * well as more details on it. | ||
| 2463 | * | ||
| 2464 | * The IRQ is disabled by default and has to be enabled before it can wake up | ||
| 2465 | * the device from suspend via ssam_irq_arm_for_wakeup(). On teardown, the IRQ | ||
| 2466 | * should be freed via ssam_irq_free(). | ||
| 2467 | */ | ||
| 2468 | int ssam_irq_setup(struct ssam_controller *ctrl) | ||
| 2469 | { | ||
| 2470 | struct device *dev = ssam_controller_device(ctrl); | ||
| 2471 | struct gpio_desc *gpiod; | ||
| 2472 | int irq; | ||
| 2473 | int status; | ||
| 2474 | |||
| 2475 | /* | ||
| 2476 | * The actual GPIO interrupt is declared in ACPI as TRIGGER_HIGH. | ||
| 2477 | * However, the GPIO line only gets reset by sending the GPIO callback | ||
| 2478 | * command to SAM (or alternatively the display-on notification). As | ||
| 2479 | * proper handling for this interrupt is not implemented yet, leaving | ||
| 2480 | * the IRQ at TRIGGER_HIGH would cause an IRQ storm (as the callback | ||
| 2481 | * never gets sent and thus the line never gets reset). To avoid this, | ||
| 2482 | * mark the IRQ as TRIGGER_RISING for now, only creating a single | ||
| 2483 | * interrupt, and let the SAM resume callback during the controller | ||
| 2484 | * resume process clear it. | ||
| 2485 | */ | ||
| 2486 | const int irqf = IRQF_SHARED | IRQF_ONESHOT | IRQF_TRIGGER_RISING; | ||
| 2487 | |||
| 2488 | gpiod = gpiod_get(dev, "ssam_wakeup-int", GPIOD_ASIS); | ||
| 2489 | if (IS_ERR(gpiod)) | ||
| 2490 | return PTR_ERR(gpiod); | ||
| 2491 | |||
| 2492 | irq = gpiod_to_irq(gpiod); | ||
| 2493 | gpiod_put(gpiod); | ||
| 2494 | |||
| 2495 | if (irq < 0) | ||
| 2496 | return irq; | ||
| 2497 | |||
| 2498 | status = request_threaded_irq(irq, NULL, ssam_irq_handle, irqf, | ||
| 2499 | "ssam_wakeup", ctrl); | ||
| 2500 | if (status) | ||
| 2501 | return status; | ||
| 2502 | |||
| 2503 | ctrl->irq.num = irq; | ||
| 2504 | disable_irq(ctrl->irq.num); | ||
| 2505 | return 0; | ||
| 2506 | } | ||
| 2507 | |||
| 2508 | /** | ||
| 2509 | * ssam_irq_free() - Free SAM EC wakeup-GPIO interrupt. | ||
| 2510 | * @ctrl: The controller for which the IRQ should be freed. | ||
| 2511 | * | ||
| 2512 | * Free the wakeup-GPIO IRQ previously set-up via ssam_irq_setup(). | ||
| 2513 | */ | ||
| 2514 | void ssam_irq_free(struct ssam_controller *ctrl) | ||
| 2515 | { | ||
| 2516 | free_irq(ctrl->irq.num, ctrl); | ||
| 2517 | ctrl->irq.num = -1; | ||
| 2518 | } | ||
| 2519 | |||
| 2520 | /** | ||
| 2521 | * ssam_irq_arm_for_wakeup() - Arm the EC IRQ for wakeup, if enabled. | ||
| 2522 | * @ctrl: The controller for which the IRQ should be armed. | ||
| 2523 | * | ||
| 2524 | * Sets up the IRQ so that it can be used to wake the device. Specifically, | ||
| 2525 | * this function enables the irq and then, if the device is allowed to wake up | ||
| 2526 | * the system, calls enable_irq_wake(). See ssam_irq_disarm_wakeup() for the | ||
| 2527 | * corresponding function to disable the IRQ. | ||
| 2528 | * | ||
| 2529 | * This function is intended to arm the IRQ before entering S2idle suspend. | ||
| 2530 | * | ||
| 2531 | * Note: calls to ssam_irq_arm_for_wakeup() and ssam_irq_disarm_wakeup() must | ||
| 2532 | * be balanced. | ||
| 2533 | */ | ||
| 2534 | int ssam_irq_arm_for_wakeup(struct ssam_controller *ctrl) | ||
| 2535 | { | ||
| 2536 | struct device *dev = ssam_controller_device(ctrl); | ||
| 2537 | int status; | ||
| 2538 | |||
| 2539 | enable_irq(ctrl->irq.num); | ||
| 2540 | if (device_may_wakeup(dev)) { | ||
| 2541 | status = enable_irq_wake(ctrl->irq.num); | ||
| 2542 | if (status) { | ||
| 2543 | ssam_err(ctrl, "failed to enable wake IRQ: %d\n", status); | ||
| 2544 | disable_irq(ctrl->irq.num); | ||
| 2545 | return status; | ||
| 2546 | } | ||
| 2547 | |||
| 2548 | ctrl->irq.wakeup_enabled = true; | ||
| 2549 | } else { | ||
| 2550 | ctrl->irq.wakeup_enabled = false; | ||
| 2551 | } | ||
| 2552 | |||
| 2553 | return 0; | ||
| 2554 | } | ||
| 2555 | |||
| 2556 | /** | ||
| 2557 | * ssam_irq_disarm_wakeup() - Disarm the wakeup IRQ. | ||
| 2558 | * @ctrl: The controller for which the IRQ should be disarmed. | ||
| 2559 | * | ||
| 2560 | * Disarm the IRQ previously set up for wake via ssam_irq_arm_for_wakeup(). | ||
| 2561 | * | ||
| 2562 | * This function is intended to disarm the IRQ after exiting S2idle suspend. | ||
| 2563 | * | ||
| 2564 | * Note: calls to ssam_irq_arm_for_wakeup() and ssam_irq_disarm_wakeup() must | ||
| 2565 | * be balanced. | ||
| 2566 | */ | ||
| 2567 | void ssam_irq_disarm_wakeup(struct ssam_controller *ctrl) | ||
| 2568 | { | ||
| 2569 | int status; | ||
| 2570 | |||
| 2571 | if (ctrl->irq.wakeup_enabled) { | ||
| 2572 | status = disable_irq_wake(ctrl->irq.num); | ||
| 2573 | if (status) | ||
| 2574 | ssam_err(ctrl, "failed to disable wake IRQ: %d\n", status); | ||
| 2575 | |||
| 2576 | ctrl->irq.wakeup_enabled = false; | ||
| 2577 | } | ||
| 2578 | disable_irq(ctrl->irq.num); | ||
| 2579 | } | ||
| @@ -0,0 +1,285 @@ | |||
| 1 | /* SPDX-License-Identifier: GPL-2.0+ */ | ||
| 2 | /* | ||
| 3 | * Main SSAM/SSH controller structure and functionality. | ||
| 4 | * | ||
| 5 | * Copyright (C) 2019-2020 Maximilian Luz <luzmaximilian@gmail.com> | ||
| 6 | */ | ||
| 7 | |||
| 8 | #ifndef _SURFACE_AGGREGATOR_CONTROLLER_H | ||
| 9 | #define _SURFACE_AGGREGATOR_CONTROLLER_H | ||
| 10 | |||
| 11 | #include <linux/kref.h> | ||
| 12 | #include <linux/list.h> | ||
| 13 | #include <linux/mutex.h> | ||
| 14 | #include <linux/rbtree.h> | ||
| 15 | #include <linux/rwsem.h> | ||
| 16 | #include <linux/serdev.h> | ||
| 17 | #include <linux/spinlock.h> | ||
| 18 | #include <linux/srcu.h> | ||
| 19 | #include <linux/types.h> | ||
| 20 | #include <linux/workqueue.h> | ||
| 21 | |||
| 22 | #include <linux/surface_aggregator/controller.h> | ||
| 23 | #include <linux/surface_aggregator/serial_hub.h> | ||
| 24 | |||
| 25 | #include "ssh_request_layer.h" | ||
| 26 | |||
| 27 | |||
| 28 | /* -- Safe counters. -------------------------------------------------------- */ | ||
| 29 | |||
| 30 | /** | ||
| 31 | * struct ssh_seq_counter - Safe counter for SSH sequence IDs. | ||
| 32 | * @value: The current counter value. | ||
| 33 | */ | ||
| 34 | struct ssh_seq_counter { | ||
| 35 | u8 value; | ||
| 36 | }; | ||
| 37 | |||
| 38 | /** | ||
| 39 | * struct ssh_rqid_counter - Safe counter for SSH request IDs. | ||
| 40 | * @value: The current counter value. | ||
| 41 | */ | ||
| 42 | struct ssh_rqid_counter { | ||
| 43 | u16 value; | ||
| 44 | }; | ||
| 45 | |||
| 46 | |||
| 47 | /* -- Event/notification system. -------------------------------------------- */ | ||
| 48 | |||
| 49 | /** | ||
| 50 | * struct ssam_nf_head - Notifier head for SSAM events. | ||
| 51 | * @srcu: The SRCU struct for synchronization. | ||
| 52 | * @head: List-head for notifier blocks registered under this head. | ||
| 53 | */ | ||
| 54 | struct ssam_nf_head { | ||
| 55 | struct srcu_struct srcu; | ||
| 56 | struct list_head head; | ||
| 57 | }; | ||
| 58 | |||
| 59 | /** | ||
| 60 | * struct ssam_nf - Notifier callback- and activation-registry for SSAM events. | ||
| 61 | * @lock: Lock guarding (de-)registration of notifier blocks. Note: This | ||
| 62 | * lock does not need to be held for notifier calls, only | ||
| 63 | * registration and deregistration. | ||
| 64 | * @refcount: The root of the RB-tree used for reference-counting enabled | ||
| 65 | * events/notifications. | ||
| 66 | * @head: The list of notifier heads for event/notification callbacks. | ||
| 67 | */ | ||
| 68 | struct ssam_nf { | ||
| 69 | struct mutex lock; | ||
| 70 | struct rb_root refcount; | ||
| 71 | struct ssam_nf_head head[SSH_NUM_EVENTS]; | ||
| 72 | }; | ||
| 73 | |||
| 74 | |||
| 75 | /* -- Event/async request completion system. -------------------------------- */ | ||
| 76 | |||
| 77 | struct ssam_cplt; | ||
| 78 | |||
| 79 | /** | ||
| 80 | * struct ssam_event_item - Struct for event queuing and completion. | ||
| 81 | * @node: The node in the queue. | ||
| 82 | * @rqid: The request ID of the event. | ||
| 83 | * @ops: Instance specific functions. | ||
| 84 | * @ops.free: Callback for freeing this event item. | ||
| 85 | * @event: Actual event data. | ||
| 86 | */ | ||
| 87 | struct ssam_event_item { | ||
| 88 | struct list_head node; | ||
| 89 | u16 rqid; | ||
| 90 | |||
| 91 | struct { | ||
| 92 | void (*free)(struct ssam_event_item *event); | ||
| 93 | } ops; | ||
| 94 | |||
| 95 | struct ssam_event event; /* must be last */ | ||
| 96 | }; | ||
| 97 | |||
| 98 | /** | ||
| 99 | * struct ssam_event_queue - Queue for completing received events. | ||
| 100 | * @cplt: Reference to the completion system on which this queue is active. | ||
| 101 | * @lock: The lock for any operation on the queue. | ||
| 102 | * @head: The list-head of the queue. | ||
| 103 | * @work: The &struct work_struct performing completion work for this queue. | ||
| 104 | */ | ||
| 105 | struct ssam_event_queue { | ||
| 106 | struct ssam_cplt *cplt; | ||
| 107 | |||
| 108 | spinlock_t lock; | ||
| 109 | struct list_head head; | ||
| 110 | struct work_struct work; | ||
| 111 | }; | ||
| 112 | |||
| 113 | /** | ||
| 114 | * struct ssam_event_target - Set of queues for a single SSH target ID. | ||
| 115 | * @queue: The array of queues, one queue per event ID. | ||
| 116 | */ | ||
| 117 | struct ssam_event_target { | ||
| 118 | struct ssam_event_queue queue[SSH_NUM_EVENTS]; | ||
| 119 | }; | ||
| 120 | |||
| 121 | /** | ||
| 122 | * struct ssam_cplt - SSAM event/async request completion system. | ||
| 123 | * @dev: The device with which this system is associated. Only used | ||
| 124 | * for logging. | ||
| 125 | * @wq: The &struct workqueue_struct on which all completion work | ||
| 126 | * items are queued. | ||
| 127 | * @event: Event completion management. | ||
| 128 | * @event.target: Array of &struct ssam_event_target, one for each target. | ||
| 129 | * @event.notif: Notifier callbacks and event activation reference counting. | ||
| 130 | */ | ||
| 131 | struct ssam_cplt { | ||
| 132 | struct device *dev; | ||
| 133 | struct workqueue_struct *wq; | ||
| 134 | |||
| 135 | struct { | ||
| 136 | struct ssam_event_target target[SSH_NUM_TARGETS]; | ||
| 137 | struct ssam_nf notif; | ||
| 138 | } event; | ||
| 139 | }; | ||
| 140 | |||
| 141 | |||
| 142 | /* -- Main SSAM device structures. ------------------------------------------ */ | ||
| 143 | |||
| 144 | /** | ||
| 145 | * enum ssam_controller_state - State values for &struct ssam_controller. | ||
| 146 | * @SSAM_CONTROLLER_UNINITIALIZED: | ||
| 147 | * The controller has not been initialized yet or has been deinitialized. | ||
| 148 | * @SSAM_CONTROLLER_INITIALIZED: | ||
| 149 | * The controller is initialized, but has not been started yet. | ||
| 150 | * @SSAM_CONTROLLER_STARTED: | ||
| 151 | * The controller has been started and is ready to use. | ||
| 152 | * @SSAM_CONTROLLER_STOPPED: | ||
| 153 | * The controller has been stopped. | ||
| 154 | * @SSAM_CONTROLLER_SUSPENDED: | ||
| 155 | * The controller has been suspended. | ||
| 156 | */ | ||
| 157 | enum ssam_controller_state { | ||
| 158 | SSAM_CONTROLLER_UNINITIALIZED, | ||
| 159 | SSAM_CONTROLLER_INITIALIZED, | ||
| 160 | SSAM_CONTROLLER_STARTED, | ||
| 161 | SSAM_CONTROLLER_STOPPED, | ||
| 162 | SSAM_CONTROLLER_SUSPENDED, | ||
| 163 | }; | ||
| 164 | |||
| 165 | /** | ||
| 166 | * struct ssam_controller_caps - Controller device capabilities. | ||
| 167 | * @ssh_power_profile: SSH power profile. | ||
| 168 | * @ssh_buffer_size: SSH driver UART buffer size. | ||
| 169 | * @screen_on_sleep_idle_timeout: SAM UART screen-on sleep idle timeout. | ||
| 170 | * @screen_off_sleep_idle_timeout: SAM UART screen-off sleep idle timeout. | ||
| 171 | * @d3_closes_handle: SAM closes UART handle in D3. | ||
| 172 | * | ||
| 173 | * Controller and SSH device capabilities found in ACPI. | ||
| 174 | */ | ||
| 175 | struct ssam_controller_caps { | ||
| 176 | u32 ssh_power_profile; | ||
| 177 | u32 ssh_buffer_size; | ||
| 178 | u32 screen_on_sleep_idle_timeout; | ||
| 179 | u32 screen_off_sleep_idle_timeout; | ||
| 180 | u32 d3_closes_handle:1; | ||
| 181 | }; | ||
| 182 | |||
| 183 | /** | ||
| 184 | * struct ssam_controller - SSAM controller device. | ||
| 185 | * @kref: Reference count of the controller. | ||
| 186 | * @lock: Main lock for the controller, used to guard state changes. | ||
| 187 | * @state: Controller state. | ||
| 188 | * @rtl: Request transport layer for SSH I/O. | ||
| 189 | * @cplt: Completion system for SSH/SSAM events and asynchronous requests. | ||
| 190 | * @counter: Safe SSH message ID counters. | ||
| 191 | * @counter.seq: Sequence ID counter. | ||
| 192 | * @counter.rqid: Request ID counter. | ||
| 193 | * @irq: Wakeup IRQ resources. | ||
| 194 | * @irq.num: The wakeup IRQ number. | ||
| 195 | * @irq.wakeup_enabled: Whether wakeup by IRQ is enabled during suspend. | ||
| 196 | * @caps: The controller device capabilities. | ||
| 197 | */ | ||
| 198 | struct ssam_controller { | ||
| 199 | struct kref kref; | ||
| 200 | |||
| 201 | struct rw_semaphore lock; | ||
| 202 | enum ssam_controller_state state; | ||
| 203 | |||
| 204 | struct ssh_rtl rtl; | ||
| 205 | struct ssam_cplt cplt; | ||
| 206 | |||
| 207 | struct { | ||
| 208 | struct ssh_seq_counter seq; | ||
| 209 | struct ssh_rqid_counter rqid; | ||
| 210 | } counter; | ||
| 211 | |||
| 212 | struct { | ||
| 213 | int num; | ||
| 214 | bool wakeup_enabled; | ||
| 215 | } irq; | ||
| 216 | |||
| 217 | struct ssam_controller_caps caps; | ||
| 218 | }; | ||
| 219 | |||
| 220 | #define to_ssam_controller(ptr, member) \ | ||
| 221 | container_of(ptr, struct ssam_controller, member) | ||
| 222 | |||
| 223 | #define ssam_dbg(ctrl, fmt, ...) rtl_dbg(&(ctrl)->rtl, fmt, ##__VA_ARGS__) | ||
| 224 | #define ssam_info(ctrl, fmt, ...) rtl_info(&(ctrl)->rtl, fmt, ##__VA_ARGS__) | ||
| 225 | #define ssam_warn(ctrl, fmt, ...) rtl_warn(&(ctrl)->rtl, fmt, ##__VA_ARGS__) | ||
| 226 | #define ssam_err(ctrl, fmt, ...) rtl_err(&(ctrl)->rtl, fmt, ##__VA_ARGS__) | ||
| 227 | |||
| 228 | /** | ||
| 229 | * ssam_controller_receive_buf() - Provide input-data to the controller. | ||
| 230 | * @ctrl: The controller. | ||
| 231 | * @buf: The input buffer. | ||
| 232 | * @n: The number of bytes in the input buffer. | ||
| 233 | * | ||
| 234 | * Provide input data to be evaluated by the controller, which has been | ||
| 235 | * received via the lower-level transport. | ||
| 236 | * | ||
| 237 | * Return: Returns the number of bytes consumed, or, if the packet transport | ||
| 238 | * layer of the controller has been shut down, %-ESHUTDOWN. | ||
| 239 | */ | ||
| 240 | static inline | ||
| 241 | int ssam_controller_receive_buf(struct ssam_controller *ctrl, | ||
| 242 | const unsigned char *buf, size_t n) | ||
| 243 | { | ||
| 244 | return ssh_ptl_rx_rcvbuf(&ctrl->rtl.ptl, buf, n); | ||
| 245 | } | ||
| 246 | |||
| 247 | /** | ||
| 248 | * ssam_controller_write_wakeup() - Notify the controller that the underlying | ||
| 249 | * device has space available for data to be written. | ||
| 250 | * @ctrl: The controller. | ||
| 251 | */ | ||
| 252 | static inline void ssam_controller_write_wakeup(struct ssam_controller *ctrl) | ||
| 253 | { | ||
| 254 | ssh_ptl_tx_wakeup_transfer(&ctrl->rtl.ptl); | ||
| 255 | } | ||
| 256 | |||
| 257 | int ssam_controller_init(struct ssam_controller *ctrl, struct serdev_device *s); | ||
| 258 | int ssam_controller_start(struct ssam_controller *ctrl); | ||
| 259 | void ssam_controller_shutdown(struct ssam_controller *ctrl); | ||
| 260 | void ssam_controller_destroy(struct ssam_controller *ctrl); | ||
| 261 | |||
| 262 | int ssam_notifier_disable_registered(struct ssam_controller *ctrl); | ||
| 263 | void ssam_notifier_restore_registered(struct ssam_controller *ctrl); | ||
| 264 | |||
| 265 | int ssam_irq_setup(struct ssam_controller *ctrl); | ||
| 266 | void ssam_irq_free(struct ssam_controller *ctrl); | ||
| 267 | int ssam_irq_arm_for_wakeup(struct ssam_controller *ctrl); | ||
| 268 | void ssam_irq_disarm_wakeup(struct ssam_controller *ctrl); | ||
| 269 | |||
| 270 | void ssam_controller_lock(struct ssam_controller *c); | ||
| 271 | void ssam_controller_unlock(struct ssam_controller *c); | ||
| 272 | |||
| 273 | int ssam_get_firmware_version(struct ssam_controller *ctrl, u32 *version); | ||
| 274 | int ssam_ctrl_notif_display_off(struct ssam_controller *ctrl); | ||
| 275 | int ssam_ctrl_notif_display_on(struct ssam_controller *ctrl); | ||
| 276 | int ssam_ctrl_notif_d0_exit(struct ssam_controller *ctrl); | ||
| 277 | int ssam_ctrl_notif_d0_entry(struct ssam_controller *ctrl); | ||
| 278 | |||
| 279 | int ssam_controller_suspend(struct ssam_controller *ctrl); | ||
| 280 | int ssam_controller_resume(struct ssam_controller *ctrl); | ||
| 281 | |||
| 282 | int ssam_event_item_cache_init(void); | ||
| 283 | void ssam_event_item_cache_destroy(void); | ||
| 284 | |||
| 285 | #endif /* _SURFACE_AGGREGATOR_CONTROLLER_H */ | ||
| @@ -0,0 +1,839 @@ | |||
| 1 | // SPDX-License-Identifier: GPL-2.0+ | ||
| 2 | /* | ||
| 3 | * Surface Serial Hub (SSH) driver for communication with the Surface/System | ||
| 4 | * Aggregator Module (SSAM/SAM). | ||
| 5 | * | ||
| 6 | * Provides access to a SAM-over-SSH connected EC via a controller device. | ||
| 7 | * Handles communication via requests as well as enabling, disabling, and | ||
| 8 | * relaying of events. | ||
| 9 | * | ||
| 10 | * Copyright (C) 2019-2020 Maximilian Luz <luzmaximilian@gmail.com> | ||
| 11 | */ | ||
| 12 | |||
| 13 | #include <linux/acpi.h> | ||
| 14 | #include <linux/atomic.h> | ||
| 15 | #include <linux/completion.h> | ||
| 16 | #include <linux/gpio/consumer.h> | ||
| 17 | #include <linux/kernel.h> | ||
| 18 | #include <linux/kref.h> | ||
| 19 | #include <linux/module.h> | ||
| 20 | #include <linux/pm.h> | ||
| 21 | #include <linux/serdev.h> | ||
| 22 | #include <linux/sysfs.h> | ||
| 23 | |||
| 24 | #include <linux/surface_aggregator/controller.h> | ||
| 25 | |||
| 26 | #include "bus.h" | ||
| 27 | #include "controller.h" | ||
| 28 | |||
| 29 | #define CREATE_TRACE_POINTS | ||
| 30 | #include "trace.h" | ||
| 31 | |||
| 32 | |||
| 33 | /* -- Static controller reference. ------------------------------------------ */ | ||
| 34 | |||
| 35 | /* | ||
| 36 | * Main controller reference. The corresponding lock must be held while | ||
| 37 | * accessing (reading/writing) the reference. | ||
| 38 | */ | ||
| 39 | static struct ssam_controller *__ssam_controller; | ||
| 40 | static DEFINE_SPINLOCK(__ssam_controller_lock); | ||
| 41 | |||
| 42 | /** | ||
| 43 | * ssam_get_controller() - Get reference to SSAM controller. | ||
| 44 | * | ||
| 45 | * Returns a reference to the SSAM controller of the system or %NULL if there | ||
| 46 | * is none, it hasn't been set up yet, or it has already been unregistered. | ||
| 47 | * This function automatically increments the reference count of the | ||
| 48 | * controller, thus the calling party must ensure that ssam_controller_put() | ||
| 49 | * is called when it doesn't need the controller any more. | ||
| 50 | */ | ||
| 51 | struct ssam_controller *ssam_get_controller(void) | ||
| 52 | { | ||
| 53 | struct ssam_controller *ctrl; | ||
| 54 | |||
| 55 | spin_lock(&__ssam_controller_lock); | ||
| 56 | |||
| 57 | ctrl = __ssam_controller; | ||
| 58 | if (!ctrl) | ||
| 59 | goto out; | ||
| 60 | |||
| 61 | if (WARN_ON(!kref_get_unless_zero(&ctrl->kref))) | ||
| 62 | ctrl = NULL; | ||
| 63 | |||
| 64 | out: | ||
| 65 | spin_unlock(&__ssam_controller_lock); | ||
| 66 | return ctrl; | ||
| 67 | } | ||
| 68 | EXPORT_SYMBOL_GPL(ssam_get_controller); | ||
| 69 | |||
| 70 | /** | ||
| 71 | * ssam_try_set_controller() - Try to set the main controller reference. | ||
| 72 | * @ctrl: The controller to which the reference should point. | ||
| 73 | * | ||
| 74 | * Set the main controller reference to the given pointer if the reference | ||
| 75 | * hasn't been set already. | ||
| 76 | * | ||
| 77 | * Return: Returns zero on success or %-EEXIST if the reference has already | ||
| 78 | * been set. | ||
| 79 | */ | ||
| 80 | static int ssam_try_set_controller(struct ssam_controller *ctrl) | ||
| 81 | { | ||
| 82 | int status = 0; | ||
| 83 | |||
| 84 | spin_lock(&__ssam_controller_lock); | ||
| 85 | if (!__ssam_controller) | ||
| 86 | __ssam_controller = ctrl; | ||
| 87 | else | ||
| 88 | status = -EEXIST; | ||
| 89 | spin_unlock(&__ssam_controller_lock); | ||
| 90 | |||
| 91 | return status; | ||
| 92 | } | ||
| 93 | |||
| 94 | /** | ||
| 95 | * ssam_clear_controller() - Remove/clear the main controller reference. | ||
| 96 | * | ||
| 97 | * Clears the main controller reference, i.e. sets it to %NULL. This function | ||
| 98 | * should be called before the controller is shut down. | ||
| 99 | */ | ||
| 100 | static void ssam_clear_controller(void) | ||
| 101 | { | ||
| 102 | spin_lock(&__ssam_controller_lock); | ||
| 103 | __ssam_controller = NULL; | ||
| 104 | spin_unlock(&__ssam_controller_lock); | ||
| 105 | } | ||
| 106 | |||
| 107 | /** | ||
| 108 | * ssam_client_link() - Link an arbitrary client device to the controller. | ||
| 109 | * @c: The controller to link to. | ||
| 110 | * @client: The client device. | ||
| 111 | * | ||
| 112 | * Link an arbitrary client device to the controller by creating a device link | ||
| 113 | * between it as consumer and the controller device as provider. This function | ||
| 114 | * can be used for non-SSAM devices (or SSAM devices not registered as child | ||
| 115 | * under the controller) to guarantee that the controller is valid for as long | ||
| 116 | * as the driver of the client device is bound, and that proper suspend and | ||
| 117 | * resume ordering is guaranteed. | ||
| 118 | * | ||
| 119 | * The device link does not have to be destructed manually. It is removed | ||
| 120 | * automatically once the driver of the client device unbinds. | ||
| 121 | * | ||
| 122 | * Return: Returns zero on success, %-ENODEV if the controller is not ready or | ||
| 123 | * going to be removed soon, or %-ENOMEM if the device link could not be | ||
| 124 | * created for other reasons. | ||
| 125 | */ | ||
| 126 | int ssam_client_link(struct ssam_controller *c, struct device *client) | ||
| 127 | { | ||
| 128 | const u32 flags = DL_FLAG_PM_RUNTIME | DL_FLAG_AUTOREMOVE_CONSUMER; | ||
| 129 | struct device_link *link; | ||
| 130 | struct device *ctrldev; | ||
| 131 | |||
| 132 | ssam_controller_statelock(c); | ||
| 133 | |||
| 134 | if (c->state != SSAM_CONTROLLER_STARTED) { | ||
| 135 | ssam_controller_stateunlock(c); | ||
| 136 | return -ENODEV; | ||
| 137 | } | ||
| 138 | |||
| 139 | ctrldev = ssam_controller_device(c); | ||
| 140 | if (!ctrldev) { | ||
| 141 | ssam_controller_stateunlock(c); | ||
| 142 | return -ENODEV; | ||
| 143 | } | ||
| 144 | |||
| 145 | link = device_link_add(client, ctrldev, flags); | ||
| 146 | if (!link) { | ||
| 147 | ssam_controller_stateunlock(c); | ||
| 148 | return -ENOMEM; | ||
| 149 | } | ||
| 150 | |||
| 151 | /* | ||
| 152 | * Return -ENODEV if supplier driver is on its way to be removed. In | ||
| 153 | * this case, the controller won't be around for much longer and the | ||
| 154 | * device link is not going to save us any more, as unbinding is | ||
| 155 | * already in progress. | ||
| 156 | */ | ||
| 157 | if (READ_ONCE(link->status) == DL_STATE_SUPPLIER_UNBIND) { | ||
| 158 | ssam_controller_stateunlock(c); | ||
| 159 | return -ENODEV; | ||
| 160 | } | ||
| 161 | |||
| 162 | ssam_controller_stateunlock(c); | ||
| 163 | return 0; | ||
| 164 | } | ||
| 165 | EXPORT_SYMBOL_GPL(ssam_client_link); | ||
| 166 | |||
| 167 | /** | ||
| 168 | * ssam_client_bind() - Bind an arbitrary client device to the controller. | ||
| 169 | * @client: The client device. | ||
| 170 | * | ||
| 171 | * Link an arbitrary client device to the controller by creating a device link | ||
| 172 | * between it as consumer and the main controller device as provider. This | ||
| 173 | * function can be used for non-SSAM devices to guarantee that the controller | ||
| 174 | * returned by this function is valid for as long as the driver of the client | ||
| 175 | * device is bound, and that proper suspend and resume ordering is guaranteed. | ||
| 176 | * | ||
| 177 | * This function does essentially the same as ssam_client_link(), except that | ||
| 178 | * it first fetches the main controller reference, then creates the link, and | ||
| 179 | * finally returns this reference. Note that this function does not increment | ||
| 180 | * the reference counter of the controller, as, due to the link, the | ||
| 181 | * controller lifetime is assured as long as the driver of the client device | ||
| 182 | * is bound. | ||
| 183 | * | ||
| 184 | * It is not valid to use the controller reference obtained by this method | ||
| 185 | * outside of the driver bound to the client device at the time of calling | ||
| 186 | * this function, without first incrementing the reference count of the | ||
| 187 | * controller via ssam_controller_get(). Even after doing this, care must be | ||
| 188 | * taken that requests are only submitted and notifiers are only | ||
| 189 | * (un-)registered when the controller is active and not suspended. In other | ||
| 190 | * words: The device link only lives as long as the client driver is bound and | ||
| 191 | * any guarantees enforced by this link (e.g. active controller state) can | ||
| 192 | * only be relied upon as long as this link exists and may need to be enforced | ||
| 193 | * in other ways afterwards. | ||
| 194 | * | ||
| 195 | * The created device link does not have to be destructed manually. It is | ||
| 196 | * removed automatically once the driver of the client device unbinds. | ||
| 197 | * | ||
| 198 | * Return: Returns the controller on success, an error pointer with %-ENODEV | ||
| 199 | * if the controller is not present, not ready or going to be removed soon, or | ||
| 200 | * %-ENOMEM if the device link could not be created for other reasons. | ||
| 201 | */ | ||
| 202 | struct ssam_controller *ssam_client_bind(struct device *client) | ||
| 203 | { | ||
| 204 | struct ssam_controller *c; | ||
| 205 | int status; | ||
| 206 | |||
| 207 | c = ssam_get_controller(); | ||
| 208 | if (!c) | ||
| 209 | return ERR_PTR(-ENODEV); | ||
| 210 | |||
| 211 | status = ssam_client_link(c, client); | ||
| 212 | |||
| 213 | /* | ||
| 214 | * Note that we can drop our controller reference in both success and | ||
| 215 | * failure cases: On success, we have bound the controller lifetime | ||
| 216 | * inherently to the client driver lifetime, i.e. it the controller is | ||
| 217 | * now guaranteed to outlive the client driver. On failure, we're not | ||
| 218 | * going to use the controller any more. | ||
| 219 | */ | ||
| 220 | ssam_controller_put(c); | ||
| 221 | |||
| 222 | return status >= 0 ? c : ERR_PTR(status); | ||
| 223 | } | ||
| 224 | EXPORT_SYMBOL_GPL(ssam_client_bind); | ||
| 225 | |||
| 226 | |||
| 227 | /* -- Glue layer (serdev_device -> ssam_controller). ------------------------ */ | ||
| 228 | |||
| 229 | static int ssam_receive_buf(struct serdev_device *dev, const unsigned char *buf, | ||
| 230 | size_t n) | ||
| 231 | { | ||
| 232 | struct ssam_controller *ctrl; | ||
| 233 | |||
| 234 | ctrl = serdev_device_get_drvdata(dev); | ||
| 235 | return ssam_controller_receive_buf(ctrl, buf, n); | ||
| 236 | } | ||
| 237 | |||
| 238 | static void ssam_write_wakeup(struct serdev_device *dev) | ||
| 239 | { | ||
| 240 | ssam_controller_write_wakeup(serdev_device_get_drvdata(dev)); | ||
| 241 | } | ||
| 242 | |||
| 243 | static const struct serdev_device_ops ssam_serdev_ops = { | ||
| 244 | .receive_buf = ssam_receive_buf, | ||
| 245 | .write_wakeup = ssam_write_wakeup, | ||
| 246 | }; | ||
| 247 | |||
| 248 | |||
| 249 | /* -- SysFS and misc. ------------------------------------------------------- */ | ||
| 250 | |||
| 251 | static int ssam_log_firmware_version(struct ssam_controller *ctrl) | ||
| 252 | { | ||
| 253 | u32 version, a, b, c; | ||
| 254 | int status; | ||
| 255 | |||
| 256 | status = ssam_get_firmware_version(ctrl, &version); | ||
| 257 | if (status) | ||
| 258 | return status; | ||
| 259 | |||
| 260 | a = (version >> 24) & 0xff; | ||
| 261 | b = ((version >> 8) & 0xffff); | ||
| 262 | c = version & 0xff; | ||
| 263 | |||
| 264 | ssam_info(ctrl, "SAM firmware version: %u.%u.%u\n", a, b, c); | ||
| 265 | return 0; | ||
| 266 | } | ||
| 267 | |||
| 268 | static ssize_t firmware_version_show(struct device *dev, | ||
| 269 | struct device_attribute *attr, char *buf) | ||
| 270 | { | ||
| 271 | struct ssam_controller *ctrl = dev_get_drvdata(dev); | ||
| 272 | u32 version, a, b, c; | ||
| 273 | int status; | ||
| 274 | |||
| 275 | status = ssam_get_firmware_version(ctrl, &version); | ||
| 276 | if (status < 0) | ||
| 277 | return status; | ||
| 278 | |||
| 279 | a = (version >> 24) & 0xff; | ||
| 280 | b = ((version >> 8) & 0xffff); | ||
| 281 | c = version & 0xff; | ||
| 282 | |||
| 283 | return sysfs_emit(buf, "%u.%u.%u\n", a, b, c); | ||
| 284 | } | ||
| 285 | static DEVICE_ATTR_RO(firmware_version); | ||
| 286 | |||
| 287 | static struct attribute *ssam_sam_attrs[] = { | ||
| 288 | &dev_attr_firmware_version.attr, | ||
| 289 | NULL | ||
| 290 | }; | ||
| 291 | |||
| 292 | static const struct attribute_group ssam_sam_group = { | ||
| 293 | .name = "sam", | ||
| 294 | .attrs = ssam_sam_attrs, | ||
| 295 | }; | ||
| 296 | |||
| 297 | |||
| 298 | /* -- ACPI based device setup. ---------------------------------------------- */ | ||
| 299 | |||
| 300 | static acpi_status ssam_serdev_setup_via_acpi_crs(struct acpi_resource *rsc, | ||
| 301 | void *ctx) | ||
| 302 | { | ||
| 303 | struct serdev_device *serdev = ctx; | ||
| 304 | struct acpi_resource_common_serialbus *serial; | ||
| 305 | struct acpi_resource_uart_serialbus *uart; | ||
| 306 | bool flow_control; | ||
| 307 | int status = 0; | ||
| 308 | |||
| 309 | if (rsc->type != ACPI_RESOURCE_TYPE_SERIAL_BUS) | ||
| 310 | return AE_OK; | ||
| 311 | |||
| 312 | serial = &rsc->data.common_serial_bus; | ||
| 313 | if (serial->type != ACPI_RESOURCE_SERIAL_TYPE_UART) | ||
| 314 | return AE_OK; | ||
| 315 | |||
| 316 | uart = &rsc->data.uart_serial_bus; | ||
| 317 | |||
| 318 | /* Set up serdev device. */ | ||
| 319 | serdev_device_set_baudrate(serdev, uart->default_baud_rate); | ||
| 320 | |||
| 321 | /* serdev currently only supports RTSCTS flow control. */ | ||
| 322 | if (uart->flow_control & (~((u8)ACPI_UART_FLOW_CONTROL_HW))) { | ||
| 323 | dev_warn(&serdev->dev, "setup: unsupported flow control (value: %#04x)\n", | ||
| 324 | uart->flow_control); | ||
| 325 | } | ||
| 326 | |||
| 327 | /* Set RTSCTS flow control. */ | ||
| 328 | flow_control = uart->flow_control & ACPI_UART_FLOW_CONTROL_HW; | ||
| 329 | serdev_device_set_flow_control(serdev, flow_control); | ||
| 330 | |||
| 331 | /* serdev currently only supports EVEN/ODD parity. */ | ||
| 332 | switch (uart->parity) { | ||
| 333 | case ACPI_UART_PARITY_NONE: | ||
| 334 | status = serdev_device_set_parity(serdev, SERDEV_PARITY_NONE); | ||
| 335 | break; | ||
| 336 | case ACPI_UART_PARITY_EVEN: | ||
| 337 | status = serdev_device_set_parity(serdev, SERDEV_PARITY_EVEN); | ||
| 338 | break; | ||
| 339 | case ACPI_UART_PARITY_ODD: | ||
| 340 | status = serdev_device_set_parity(serdev, SERDEV_PARITY_ODD); | ||
| 341 | break; | ||
| 342 | default: | ||
| 343 | dev_warn(&serdev->dev, "setup: unsupported parity (value: %#04x)\n", | ||
| 344 | uart->parity); | ||
| 345 | break; | ||
| 346 | } | ||
| 347 | |||
| 348 | if (status) { | ||
| 349 | dev_err(&serdev->dev, "setup: failed to set parity (value: %#04x, error: %d)\n", | ||
| 350 | uart->parity, status); | ||
| 351 | return AE_ERROR; | ||
| 352 | } | ||
| 353 | |||
| 354 | /* We've found the resource and are done. */ | ||
| 355 | return AE_CTRL_TERMINATE; | ||
| 356 | } | ||
| 357 | |||
| 358 | static acpi_status ssam_serdev_setup_via_acpi(acpi_handle handle, | ||
| 359 | struct serdev_device *serdev) | ||
| 360 | { | ||
| 361 | return acpi_walk_resources(handle, METHOD_NAME__CRS, | ||
| 362 | ssam_serdev_setup_via_acpi_crs, serdev); | ||
| 363 | } | ||
| 364 | |||
| 365 | |||
| 366 | /* -- Power management. ----------------------------------------------------- */ | ||
| 367 | |||
| 368 | static void ssam_serial_hub_shutdown(struct device *dev) | ||
| 369 | { | ||
| 370 | struct ssam_controller *c = dev_get_drvdata(dev); | ||
| 371 | int status; | ||
| 372 | |||
| 373 | /* | ||
| 374 | * Try to disable notifiers, signal display-off and D0-exit, ignore any | ||
| 375 | * errors. | ||
| 376 | * | ||
| 377 | * Note: It has not been established yet if this is actually | ||
| 378 | * necessary/useful for shutdown. | ||
| 379 | */ | ||
| 380 | |||
| 381 | status = ssam_notifier_disable_registered(c); | ||
| 382 | if (status) { | ||
| 383 | ssam_err(c, "pm: failed to disable notifiers for shutdown: %d\n", | ||
| 384 | status); | ||
| 385 | } | ||
| 386 | |||
| 387 | status = ssam_ctrl_notif_display_off(c); | ||
| 388 | if (status) | ||
| 389 | ssam_err(c, "pm: display-off notification failed: %d\n", status); | ||
| 390 | |||
| 391 | status = ssam_ctrl_notif_d0_exit(c); | ||
| 392 | if (status) | ||
| 393 | ssam_err(c, "pm: D0-exit notification failed: %d\n", status); | ||
| 394 | } | ||
| 395 | |||
| 396 | #ifdef CONFIG_PM_SLEEP | ||
| 397 | |||
| 398 | static int ssam_serial_hub_pm_prepare(struct device *dev) | ||
| 399 | { | ||
| 400 | struct ssam_controller *c = dev_get_drvdata(dev); | ||
| 401 | int status; | ||
| 402 | |||
| 403 | /* | ||
| 404 | * Try to signal display-off, This will quiesce events. | ||
| 405 | * | ||
| 406 | * Note: Signaling display-off/display-on should normally be done from | ||
| 407 | * some sort of display state notifier. As that is not available, | ||
| 408 | * signal it here. | ||
| 409 | */ | ||
| 410 | |||
| 411 | status = ssam_ctrl_notif_display_off(c); | ||
| 412 | if (status) | ||
| 413 | ssam_err(c, "pm: display-off notification failed: %d\n", status); | ||
| 414 | |||
| 415 | return status; | ||
| 416 | } | ||
| 417 | |||
| 418 | static void ssam_serial_hub_pm_complete(struct device *dev) | ||
| 419 | { | ||
| 420 | struct ssam_controller *c = dev_get_drvdata(dev); | ||
| 421 | int status; | ||
| 422 | |||
| 423 | /* | ||
| 424 | * Try to signal display-on. This will restore events. | ||
| 425 | * | ||
| 426 | * Note: Signaling display-off/display-on should normally be done from | ||
| 427 | * some sort of display state notifier. As that is not available, | ||
| 428 | * signal it here. | ||
| 429 | */ | ||
| 430 | |||
| 431 | status = ssam_ctrl_notif_display_on(c); | ||
| 432 | if (status) | ||
| 433 | ssam_err(c, "pm: display-on notification failed: %d\n", status); | ||
| 434 | } | ||
| 435 | |||
| 436 | static int ssam_serial_hub_pm_suspend(struct device *dev) | ||
| 437 | { | ||
| 438 | struct ssam_controller *c = dev_get_drvdata(dev); | ||
| 439 | int status; | ||
| 440 | |||
| 441 | /* | ||
| 442 | * Try to signal D0-exit, enable IRQ wakeup if specified. Abort on | ||
| 443 | * error. | ||
| 444 | */ | ||
| 445 | |||
| 446 | status = ssam_ctrl_notif_d0_exit(c); | ||
| 447 | if (status) { | ||
| 448 | ssam_err(c, "pm: D0-exit notification failed: %d\n", status); | ||
| 449 | goto err_notif; | ||
| 450 | } | ||
| 451 | |||
| 452 | status = ssam_irq_arm_for_wakeup(c); | ||
| 453 | if (status) | ||
| 454 | goto err_irq; | ||
| 455 | |||
| 456 | WARN_ON(ssam_controller_suspend(c)); | ||
| 457 | return 0; | ||
| 458 | |||
| 459 | err_irq: | ||
| 460 | ssam_ctrl_notif_d0_entry(c); | ||
| 461 | err_notif: | ||
| 462 | ssam_ctrl_notif_display_on(c); | ||
| 463 | return status; | ||
| 464 | } | ||
| 465 | |||
| 466 | static int ssam_serial_hub_pm_resume(struct device *dev) | ||
| 467 | { | ||
| 468 | struct ssam_controller *c = dev_get_drvdata(dev); | ||
| 469 | int status; | ||
| 470 | |||
| 471 | WARN_ON(ssam_controller_resume(c)); | ||
| 472 | |||
| 473 | /* | ||
| 474 | * Try to disable IRQ wakeup (if specified) and signal D0-entry. In | ||
| 475 | * case of errors, log them and try to restore normal operation state | ||
| 476 | * as far as possible. | ||
| 477 | * | ||
| 478 | * Note: Signaling display-off/display-on should normally be done from | ||
| 479 | * some sort of display state notifier. As that is not available, | ||
| 480 | * signal it here. | ||
| 481 | */ | ||
| 482 | |||
| 483 | ssam_irq_disarm_wakeup(c); | ||
| 484 | |||
| 485 | status = ssam_ctrl_notif_d0_entry(c); | ||
| 486 | if (status) | ||
| 487 | ssam_err(c, "pm: D0-entry notification failed: %d\n", status); | ||
| 488 | |||
| 489 | return 0; | ||
| 490 | } | ||
| 491 | |||
| 492 | static int ssam_serial_hub_pm_freeze(struct device *dev) | ||
| 493 | { | ||
| 494 | struct ssam_controller *c = dev_get_drvdata(dev); | ||
| 495 | int status; | ||
| 496 | |||
| 497 | /* | ||
| 498 | * During hibernation image creation, we only have to ensure that the | ||
| 499 | * EC doesn't send us any events. This is done via the display-off | ||
| 500 | * and D0-exit notifications. Note that this sets up the wakeup IRQ | ||
| 501 | * on the EC side, however, we have disabled it by default on our side | ||
| 502 | * and won't enable it here. | ||
| 503 | * | ||
| 504 | * See ssam_serial_hub_poweroff() for more details on the hibernation | ||
| 505 | * process. | ||
| 506 | */ | ||
| 507 | |||
| 508 | status = ssam_ctrl_notif_d0_exit(c); | ||
| 509 | if (status) { | ||
| 510 | ssam_err(c, "pm: D0-exit notification failed: %d\n", status); | ||
| 511 | ssam_ctrl_notif_display_on(c); | ||
| 512 | return status; | ||
| 513 | } | ||
| 514 | |||
| 515 | WARN_ON(ssam_controller_suspend(c)); | ||
| 516 | return 0; | ||
| 517 | } | ||
| 518 | |||
| 519 | static int ssam_serial_hub_pm_thaw(struct device *dev) | ||
| 520 | { | ||
| 521 | struct ssam_controller *c = dev_get_drvdata(dev); | ||
| 522 | int status; | ||
| 523 | |||
| 524 | WARN_ON(ssam_controller_resume(c)); | ||
| 525 | |||
| 526 | status = ssam_ctrl_notif_d0_entry(c); | ||
| 527 | if (status) | ||
| 528 | ssam_err(c, "pm: D0-exit notification failed: %d\n", status); | ||
| 529 | |||
| 530 | return status; | ||
| 531 | } | ||
| 532 | |||
| 533 | static int ssam_serial_hub_pm_poweroff(struct device *dev) | ||
| 534 | { | ||
| 535 | struct ssam_controller *c = dev_get_drvdata(dev); | ||
| 536 | int status; | ||
| 537 | |||
| 538 | /* | ||
| 539 | * When entering hibernation and powering off the system, the EC, at | ||
| 540 | * least on some models, may disable events. Without us taking care of | ||
| 541 | * that, this leads to events not being enabled/restored when the | ||
| 542 | * system resumes from hibernation, resulting SAM-HID subsystem devices | ||
| 543 | * (i.e. keyboard, touchpad) not working, AC-plug/AC-unplug events being | ||
| 544 | * gone, etc. | ||
| 545 | * | ||
| 546 | * To avoid these issues, we disable all registered events here (this is | ||
| 547 | * likely not actually required) and restore them during the drivers PM | ||
| 548 | * restore callback. | ||
| 549 | * | ||
| 550 | * Wakeup from the EC interrupt is not supported during hibernation, | ||
| 551 | * so don't arm the IRQ here. | ||
| 552 | */ | ||
| 553 | |||
| 554 | status = ssam_notifier_disable_registered(c); | ||
| 555 | if (status) { | ||
| 556 | ssam_err(c, "pm: failed to disable notifiers for hibernation: %d\n", | ||
| 557 | status); | ||
| 558 | return status; | ||
| 559 | } | ||
| 560 | |||
| 561 | status = ssam_ctrl_notif_d0_exit(c); | ||
| 562 | if (status) { | ||
| 563 | ssam_err(c, "pm: D0-exit notification failed: %d\n", status); | ||
| 564 | ssam_notifier_restore_registered(c); | ||
| 565 | return status; | ||
| 566 | } | ||
| 567 | |||
| 568 | WARN_ON(ssam_controller_suspend(c)); | ||
| 569 | return 0; | ||
| 570 | } | ||
| 571 | |||
| 572 | static int ssam_serial_hub_pm_restore(struct device *dev) | ||
| 573 | { | ||
| 574 | struct ssam_controller *c = dev_get_drvdata(dev); | ||
| 575 | int status; | ||
| 576 | |||
| 577 | /* | ||
| 578 | * Ignore but log errors, try to restore state as much as possible in | ||
| 579 | * case of failures. See ssam_serial_hub_poweroff() for more details on | ||
| 580 | * the hibernation process. | ||
| 581 | */ | ||
| 582 | |||
| 583 | WARN_ON(ssam_controller_resume(c)); | ||
| 584 | |||
| 585 | status = ssam_ctrl_notif_d0_entry(c); | ||
| 586 | if (status) | ||
| 587 | ssam_err(c, "pm: D0-entry notification failed: %d\n", status); | ||
| 588 | |||
| 589 | ssam_notifier_restore_registered(c); | ||
| 590 | return 0; | ||
| 591 | } | ||
| 592 | |||
| 593 | static const struct dev_pm_ops ssam_serial_hub_pm_ops = { | ||
| 594 | .prepare = ssam_serial_hub_pm_prepare, | ||
| 595 | .complete = ssam_serial_hub_pm_complete, | ||
| 596 | .suspend = ssam_serial_hub_pm_suspend, | ||
| 597 | .resume = ssam_serial_hub_pm_resume, | ||
| 598 | .freeze = ssam_serial_hub_pm_freeze, | ||
| 599 | .thaw = ssam_serial_hub_pm_thaw, | ||
| 600 | .poweroff = ssam_serial_hub_pm_poweroff, | ||
| 601 | .restore = ssam_serial_hub_pm_restore, | ||
| 602 | }; | ||
| 603 | |||
| 604 | #else /* CONFIG_PM_SLEEP */ | ||
| 605 | |||
| 606 | static const struct dev_pm_ops ssam_serial_hub_pm_ops = { }; | ||
| 607 | |||
| 608 | #endif /* CONFIG_PM_SLEEP */ | ||
| 609 | |||
| 610 | |||
| 611 | /* -- Device/driver setup. -------------------------------------------------- */ | ||
| 612 | |||
| 613 | static const struct acpi_gpio_params gpio_ssam_wakeup_int = { 0, 0, false }; | ||
| 614 | static const struct acpi_gpio_params gpio_ssam_wakeup = { 1, 0, false }; | ||
| 615 | |||
| 616 | static const struct acpi_gpio_mapping ssam_acpi_gpios[] = { | ||
| 617 | { "ssam_wakeup-int-gpio", &gpio_ssam_wakeup_int, 1 }, | ||
| 618 | { "ssam_wakeup-gpio", &gpio_ssam_wakeup, 1 }, | ||
| 619 | { }, | ||
| 620 | }; | ||
| 621 | |||
| 622 | static int ssam_serial_hub_probe(struct serdev_device *serdev) | ||
| 623 | { | ||
| 624 | struct ssam_controller *ctrl; | ||
| 625 | acpi_handle *ssh = ACPI_HANDLE(&serdev->dev); | ||
| 626 | acpi_status astatus; | ||
| 627 | int status; | ||
| 628 | |||
| 629 | if (gpiod_count(&serdev->dev, NULL) < 0) | ||
| 630 | return -ENODEV; | ||
| 631 | |||
| 632 | status = devm_acpi_dev_add_driver_gpios(&serdev->dev, ssam_acpi_gpios); | ||
| 633 | if (status) | ||
| 634 | return status; | ||
| 635 | |||
| 636 | /* Allocate controller. */ | ||
| 637 | ctrl = kzalloc(sizeof(*ctrl), GFP_KERNEL); | ||
| 638 | if (!ctrl) | ||
| 639 | return -ENOMEM; | ||
| 640 | |||
| 641 | /* Initialize controller. */ | ||
| 642 | status = ssam_controller_init(ctrl, serdev); | ||
| 643 | if (status) | ||
| 644 | goto err_ctrl_init; | ||
| 645 | |||
| 646 | ssam_controller_lock(ctrl); | ||
| 647 | |||
| 648 | /* Set up serdev device. */ | ||
| 649 | serdev_device_set_drvdata(serdev, ctrl); | ||
| 650 | serdev_device_set_client_ops(serdev, &ssam_serdev_ops); | ||
| 651 | status = serdev_device_open(serdev); | ||
| 652 | if (status) | ||
| 653 | goto err_devopen; | ||
| 654 | |||
| 655 | astatus = ssam_serdev_setup_via_acpi(ssh, serdev); | ||
| 656 | if (ACPI_FAILURE(astatus)) { | ||
| 657 | status = -ENXIO; | ||
| 658 | goto err_devinit; | ||
| 659 | } | ||
| 660 | |||
| 661 | /* Start controller. */ | ||
| 662 | status = ssam_controller_start(ctrl); | ||
| 663 | if (status) | ||
| 664 | goto err_devinit; | ||
| 665 | |||
| 666 | ssam_controller_unlock(ctrl); | ||
| 667 | |||
| 668 | /* | ||
| 669 | * Initial SAM requests: Log version and notify default/init power | ||
| 670 | * states. | ||
| 671 | */ | ||
| 672 | status = ssam_log_firmware_version(ctrl); | ||
| 673 | if (status) | ||
| 674 | goto err_initrq; | ||
| 675 | |||
| 676 | status = ssam_ctrl_notif_d0_entry(ctrl); | ||
| 677 | if (status) | ||
| 678 | goto err_initrq; | ||
| 679 | |||
| 680 | status = ssam_ctrl_notif_display_on(ctrl); | ||
| 681 | if (status) | ||
| 682 | goto err_initrq; | ||
| 683 | |||
| 684 | status = sysfs_create_group(&serdev->dev.kobj, &ssam_sam_group); | ||
| 685 | if (status) | ||
| 686 | goto err_initrq; | ||
| 687 | |||
| 688 | /* Set up IRQ. */ | ||
| 689 | status = ssam_irq_setup(ctrl); | ||
| 690 | if (status) | ||
| 691 | goto err_irq; | ||
| 692 | |||
| 693 | /* Finally, set main controller reference. */ | ||
| 694 | status = ssam_try_set_controller(ctrl); | ||
| 695 | if (WARN_ON(status)) /* Currently, we're the only provider. */ | ||
| 696 | goto err_mainref; | ||
| 697 | |||
| 698 | /* | ||
| 699 | * TODO: The EC can wake up the system via the associated GPIO interrupt | ||
| 700 | * in multiple situations. One of which is the remaining battery | ||
| 701 | * capacity falling below a certain threshold. Normally, we should | ||
| 702 | * use the device_init_wakeup function, however, the EC also seems | ||
| 703 | * to have other reasons for waking up the system and it seems | ||
| 704 | * that Windows has additional checks whether the system should be | ||
| 705 | * resumed. In short, this causes some spurious unwanted wake-ups. | ||
| 706 | * For now let's thus default power/wakeup to false. | ||
| 707 | */ | ||
| 708 | device_set_wakeup_capable(&serdev->dev, true); | ||
| 709 | acpi_walk_dep_device_list(ssh); | ||
| 710 | |||
| 711 | return 0; | ||
| 712 | |||
| 713 | err_mainref: | ||
| 714 | ssam_irq_free(ctrl); | ||
| 715 | err_irq: | ||
| 716 | sysfs_remove_group(&serdev->dev.kobj, &ssam_sam_group); | ||
| 717 | err_initrq: | ||
| 718 | ssam_controller_lock(ctrl); | ||
| 719 | ssam_controller_shutdown(ctrl); | ||
| 720 | err_devinit: | ||
| 721 | serdev_device_close(serdev); | ||
| 722 | err_devopen: | ||
| 723 | ssam_controller_destroy(ctrl); | ||
| 724 | ssam_controller_unlock(ctrl); | ||
| 725 | err_ctrl_init: | ||
| 726 | kfree(ctrl); | ||
| 727 | return status; | ||
| 728 | } | ||
| 729 | |||
| 730 | static void ssam_serial_hub_remove(struct serdev_device *serdev) | ||
| 731 | { | ||
| 732 | struct ssam_controller *ctrl = serdev_device_get_drvdata(serdev); | ||
| 733 | int status; | ||
| 734 | |||
| 735 | /* Clear static reference so that no one else can get a new one. */ | ||
| 736 | ssam_clear_controller(); | ||
| 737 | |||
| 738 | /* Disable and free IRQ. */ | ||
| 739 | ssam_irq_free(ctrl); | ||
| 740 | |||
| 741 | sysfs_remove_group(&serdev->dev.kobj, &ssam_sam_group); | ||
| 742 | ssam_controller_lock(ctrl); | ||
| 743 | |||
| 744 | /* Remove all client devices. */ | ||
| 745 | ssam_controller_remove_clients(ctrl); | ||
| 746 | |||
| 747 | /* Act as if suspending to silence events. */ | ||
| 748 | status = ssam_ctrl_notif_display_off(ctrl); | ||
| 749 | if (status) { | ||
| 750 | dev_err(&serdev->dev, "display-off notification failed: %d\n", | ||
| 751 | status); | ||
| 752 | } | ||
| 753 | |||
| 754 | status = ssam_ctrl_notif_d0_exit(ctrl); | ||
| 755 | if (status) { | ||
| 756 | dev_err(&serdev->dev, "D0-exit notification failed: %d\n", | ||
| 757 | status); | ||
| 758 | } | ||
| 759 | |||
| 760 | /* Shut down controller and remove serdev device reference from it. */ | ||
| 761 | ssam_controller_shutdown(ctrl); | ||
| 762 | |||
| 763 | /* Shut down actual transport. */ | ||
| 764 | serdev_device_wait_until_sent(serdev, 0); | ||
| 765 | serdev_device_close(serdev); | ||
| 766 | |||
| 767 | /* Drop our controller reference. */ | ||
| 768 | ssam_controller_unlock(ctrl); | ||
| 769 | ssam_controller_put(ctrl); | ||
| 770 | |||
| 771 | device_set_wakeup_capable(&serdev->dev, false); | ||
| 772 | } | ||
| 773 | |||
| 774 | static const struct acpi_device_id ssam_serial_hub_match[] = { | ||
| 775 | { "MSHW0084", 0 }, | ||
| 776 | { }, | ||
| 777 | }; | ||
| 778 | MODULE_DEVICE_TABLE(acpi, ssam_serial_hub_match); | ||
| 779 | |||
| 780 | static struct serdev_device_driver ssam_serial_hub = { | ||
| 781 | .probe = ssam_serial_hub_probe, | ||
| 782 | .remove = ssam_serial_hub_remove, | ||
| 783 | .driver = { | ||
| 784 | .name = "surface_serial_hub", | ||
| 785 | .acpi_match_table = ssam_serial_hub_match, | ||
| 786 | .pm = &ssam_serial_hub_pm_ops, | ||
| 787 | .shutdown = ssam_serial_hub_shutdown, | ||
| 788 | .probe_type = PROBE_PREFER_ASYNCHRONOUS, | ||
| 789 | }, | ||
| 790 | }; | ||
| 791 | |||
| 792 | |||
| 793 | /* -- Module setup. --------------------------------------------------------- */ | ||
| 794 | |||
| 795 | static int __init ssam_core_init(void) | ||
| 796 | { | ||
| 797 | int status; | ||
| 798 | |||
| 799 | status = ssam_bus_register(); | ||
| 800 | if (status) | ||
| 801 | goto err_bus; | ||
| 802 | |||
| 803 | status = ssh_ctrl_packet_cache_init(); | ||
| 804 | if (status) | ||
| 805 | goto err_cpkg; | ||
| 806 | |||
| 807 | status = ssam_event_item_cache_init(); | ||
| 808 | if (status) | ||
| 809 | goto err_evitem; | ||
| 810 | |||
| 811 | status = serdev_device_driver_register(&ssam_serial_hub); | ||
| 812 | if (status) | ||
| 813 | goto err_register; | ||
| 814 | |||
| 815 | return 0; | ||
| 816 | |||
| 817 | err_register: | ||
| 818 | ssam_event_item_cache_destroy(); | ||
| 819 | err_evitem: | ||
| 820 | ssh_ctrl_packet_cache_destroy(); | ||
| 821 | err_cpkg: | ||
| 822 | ssam_bus_unregister(); | ||
| 823 | err_bus: | ||
| 824 | return status; | ||
| 825 | } | ||
| 826 | module_init(ssam_core_init); | ||
| 827 | |||
| 828 | static void __exit ssam_core_exit(void) | ||
| 829 | { | ||
| 830 | serdev_device_driver_unregister(&ssam_serial_hub); | ||
| 831 | ssam_event_item_cache_destroy(); | ||
| 832 | ssh_ctrl_packet_cache_destroy(); | ||
| 833 | ssam_bus_unregister(); | ||
| 834 | } | ||
| 835 | module_exit(ssam_core_exit); | ||
| 836 | |||
| 837 | MODULE_AUTHOR("Maximilian Luz <luzmaximilian@gmail.com>"); | ||
| 838 | MODULE_DESCRIPTION("Subsystem and Surface Serial Hub driver for Surface System Aggregator Module"); | ||
| 839 | MODULE_LICENSE("GPL"); | ||
| @@ -0,0 +1,205 @@ | |||
| 1 | /* SPDX-License-Identifier: GPL-2.0+ */ | ||
| 2 | /* | ||
| 3 | * SSH message builder functions. | ||
| 4 | * | ||
| 5 | * Copyright (C) 2019-2020 Maximilian Luz <luzmaximilian@gmail.com> | ||
| 6 | */ | ||
| 7 | |||
| 8 | #ifndef _SURFACE_AGGREGATOR_SSH_MSGB_H | ||
| 9 | #define _SURFACE_AGGREGATOR_SSH_MSGB_H | ||
| 10 | |||
| 11 | #include <asm/unaligned.h> | ||
| 12 | #include <linux/types.h> | ||
| 13 | |||
| 14 | #include <linux/surface_aggregator/controller.h> | ||
| 15 | #include <linux/surface_aggregator/serial_hub.h> | ||
| 16 | |||
| 17 | /** | ||
| 18 | * struct msgbuf - Buffer struct to construct SSH messages. | ||
| 19 | * @begin: Pointer to the beginning of the allocated buffer space. | ||
| 20 | * @end: Pointer to the end (one past last element) of the allocated buffer | ||
| 21 | * space. | ||
| 22 | * @ptr: Pointer to the first free element in the buffer. | ||
| 23 | */ | ||
| 24 | struct msgbuf { | ||
| 25 | u8 *begin; | ||
| 26 | u8 *end; | ||
| 27 | u8 *ptr; | ||
| 28 | }; | ||
| 29 | |||
| 30 | /** | ||
| 31 | * msgb_init() - Initialize the given message buffer struct. | ||
| 32 | * @msgb: The buffer struct to initialize | ||
| 33 | * @ptr: Pointer to the underlying memory by which the buffer will be backed. | ||
| 34 | * @cap: Size of the underlying memory. | ||
| 35 | * | ||
| 36 | * Initialize the given message buffer struct using the provided memory as | ||
| 37 | * backing. | ||
| 38 | */ | ||
| 39 | static inline void msgb_init(struct msgbuf *msgb, u8 *ptr, size_t cap) | ||
| 40 | { | ||
| 41 | msgb->begin = ptr; | ||
| 42 | msgb->end = ptr + cap; | ||
| 43 | msgb->ptr = ptr; | ||
| 44 | } | ||
| 45 | |||
| 46 | /** | ||
| 47 | * msgb_bytes_used() - Return the current number of bytes used in the buffer. | ||
| 48 | * @msgb: The message buffer. | ||
| 49 | */ | ||
| 50 | static inline size_t msgb_bytes_used(const struct msgbuf *msgb) | ||
| 51 | { | ||
| 52 | return msgb->ptr - msgb->begin; | ||
| 53 | } | ||
| 54 | |||
| 55 | static inline void __msgb_push_u8(struct msgbuf *msgb, u8 value) | ||
| 56 | { | ||
| 57 | *msgb->ptr = value; | ||
| 58 | msgb->ptr += sizeof(u8); | ||
| 59 | } | ||
| 60 | |||
| 61 | static inline void __msgb_push_u16(struct msgbuf *msgb, u16 value) | ||
| 62 | { | ||
| 63 | put_unaligned_le16(value, msgb->ptr); | ||
| 64 | msgb->ptr += sizeof(u16); | ||
| 65 | } | ||
| 66 | |||
| 67 | /** | ||
| 68 | * msgb_push_u16() - Push a u16 value to the buffer. | ||
| 69 | * @msgb: The message buffer. | ||
| 70 | * @value: The value to push to the buffer. | ||
| 71 | */ | ||
| 72 | static inline void msgb_push_u16(struct msgbuf *msgb, u16 value) | ||
| 73 | { | ||
| 74 | if (WARN_ON(msgb->ptr + sizeof(u16) > msgb->end)) | ||
| 75 | return; | ||
| 76 | |||
| 77 | __msgb_push_u16(msgb, value); | ||
| 78 | } | ||
| 79 | |||
| 80 | /** | ||
| 81 | * msgb_push_syn() - Push SSH SYN bytes to the buffer. | ||
| 82 | * @msgb: The message buffer. | ||
| 83 | */ | ||
| 84 | static inline void msgb_push_syn(struct msgbuf *msgb) | ||
| 85 | { | ||
| 86 | msgb_push_u16(msgb, SSH_MSG_SYN); | ||
| 87 | } | ||
| 88 | |||
| 89 | /** | ||
| 90 | * msgb_push_buf() - Push raw data to the buffer. | ||
| 91 | * @msgb: The message buffer. | ||
| 92 | * @buf: The data to push to the buffer. | ||
| 93 | * @len: The length of the data to push to the buffer. | ||
| 94 | */ | ||
| 95 | static inline void msgb_push_buf(struct msgbuf *msgb, const u8 *buf, size_t len) | ||
| 96 | { | ||
| 97 | msgb->ptr = memcpy(msgb->ptr, buf, len) + len; | ||
| 98 | } | ||
| 99 | |||
| 100 | /** | ||
| 101 | * msgb_push_crc() - Compute CRC and push it to the buffer. | ||
| 102 | * @msgb: The message buffer. | ||
| 103 | * @buf: The data for which the CRC should be computed. | ||
| 104 | * @len: The length of the data for which the CRC should be computed. | ||
| 105 | */ | ||
| 106 | static inline void msgb_push_crc(struct msgbuf *msgb, const u8 *buf, size_t len) | ||
| 107 | { | ||
| 108 | msgb_push_u16(msgb, ssh_crc(buf, len)); | ||
| 109 | } | ||
| 110 | |||
| 111 | /** | ||
| 112 | * msgb_push_frame() - Push a SSH message frame header to the buffer. | ||
| 113 | * @msgb: The message buffer | ||
| 114 | * @ty: The type of the frame. | ||
| 115 | * @len: The length of the payload of the frame. | ||
| 116 | * @seq: The sequence ID of the frame/packet. | ||
| 117 | */ | ||
| 118 | static inline void msgb_push_frame(struct msgbuf *msgb, u8 ty, u16 len, u8 seq) | ||
| 119 | { | ||
| 120 | u8 *const begin = msgb->ptr; | ||
| 121 | |||
| 122 | if (WARN_ON(msgb->ptr + sizeof(struct ssh_frame) > msgb->end)) | ||
| 123 | return; | ||
| 124 | |||
| 125 | __msgb_push_u8(msgb, ty); /* Frame type. */ | ||
| 126 | __msgb_push_u16(msgb, len); /* Frame payload length. */ | ||
| 127 | __msgb_push_u8(msgb, seq); /* Frame sequence ID. */ | ||
| 128 | |||
| 129 | msgb_push_crc(msgb, begin, msgb->ptr - begin); | ||
| 130 | } | ||
| 131 | |||
| 132 | /** | ||
| 133 | * msgb_push_ack() - Push a SSH ACK frame to the buffer. | ||
| 134 | * @msgb: The message buffer | ||
| 135 | * @seq: The sequence ID of the frame/packet to be ACKed. | ||
| 136 | */ | ||
| 137 | static inline void msgb_push_ack(struct msgbuf *msgb, u8 seq) | ||
| 138 | { | ||
| 139 | /* SYN. */ | ||
| 140 | msgb_push_syn(msgb); | ||
| 141 | |||
| 142 | /* ACK-type frame + CRC. */ | ||
| 143 | msgb_push_frame(msgb, SSH_FRAME_TYPE_ACK, 0x00, seq); | ||
| 144 | |||
| 145 | /* Payload CRC (ACK-type frames do not have a payload). */ | ||
| 146 | msgb_push_crc(msgb, msgb->ptr, 0); | ||
| 147 | } | ||
| 148 | |||
| 149 | /** | ||
| 150 | * msgb_push_nak() - Push a SSH NAK frame to the buffer. | ||
| 151 | * @msgb: The message buffer | ||
| 152 | */ | ||
| 153 | static inline void msgb_push_nak(struct msgbuf *msgb) | ||
| 154 | { | ||
| 155 | /* SYN. */ | ||
| 156 | msgb_push_syn(msgb); | ||
| 157 | |||
| 158 | /* NAK-type frame + CRC. */ | ||
| 159 | msgb_push_frame(msgb, SSH_FRAME_TYPE_NAK, 0x00, 0x00); | ||
| 160 | |||
| 161 | /* Payload CRC (ACK-type frames do not have a payload). */ | ||
| 162 | msgb_push_crc(msgb, msgb->ptr, 0); | ||
| 163 | } | ||
| 164 | |||
| 165 | /** | ||
| 166 | * msgb_push_cmd() - Push a SSH command frame with payload to the buffer. | ||
| 167 | * @msgb: The message buffer. | ||
| 168 | * @seq: The sequence ID (SEQ) of the frame/packet. | ||
| 169 | * @rqid: The request ID (RQID) of the request contained in the frame. | ||
| 170 | * @rqst: The request to wrap in the frame. | ||
| 171 | */ | ||
| 172 | static inline void msgb_push_cmd(struct msgbuf *msgb, u8 seq, u16 rqid, | ||
| 173 | const struct ssam_request *rqst) | ||
| 174 | { | ||
| 175 | const u8 type = SSH_FRAME_TYPE_DATA_SEQ; | ||
| 176 | u8 *cmd; | ||
| 177 | |||
| 178 | /* SYN. */ | ||
| 179 | msgb_push_syn(msgb); | ||
| 180 | |||
| 181 | /* Command frame + CRC. */ | ||
| 182 | msgb_push_frame(msgb, type, sizeof(struct ssh_command) + rqst->length, seq); | ||
| 183 | |||
| 184 | /* Frame payload: Command struct + payload. */ | ||
| 185 | if (WARN_ON(msgb->ptr + sizeof(struct ssh_command) > msgb->end)) | ||
| 186 | return; | ||
| 187 | |||
| 188 | cmd = msgb->ptr; | ||
| 189 | |||
| 190 | __msgb_push_u8(msgb, SSH_PLD_TYPE_CMD); /* Payload type. */ | ||
| 191 | __msgb_push_u8(msgb, rqst->target_category); /* Target category. */ | ||
| 192 | __msgb_push_u8(msgb, rqst->target_id); /* Target ID (out). */ | ||
| 193 | __msgb_push_u8(msgb, 0x00); /* Target ID (in). */ | ||
| 194 | __msgb_push_u8(msgb, rqst->instance_id); /* Instance ID. */ | ||
| 195 | __msgb_push_u16(msgb, rqid); /* Request ID. */ | ||
| 196 | __msgb_push_u8(msgb, rqst->command_id); /* Command ID. */ | ||
| 197 | |||
| 198 | /* Command payload. */ | ||
| 199 | msgb_push_buf(msgb, rqst->payload, rqst->length); | ||
| 200 | |||
| 201 | /* CRC for command struct + payload. */ | ||
| 202 | msgb_push_crc(msgb, cmd, msgb->ptr - cmd); | ||
| 203 | } | ||
| 204 | |||
| 205 | #endif /* _SURFACE_AGGREGATOR_SSH_MSGB_H */ | ||
| @@ -0,0 +1,2074 @@ | |||
| 1 | // SPDX-License-Identifier: GPL-2.0+ | ||
| 2 | /* | ||
| 3 | * SSH packet transport layer. | ||
| 4 | * | ||
| 5 | * Copyright (C) 2019-2020 Maximilian Luz <luzmaximilian@gmail.com> | ||
| 6 | */ | ||
| 7 | |||
| 8 | #include <asm/unaligned.h> | ||
| 9 | #include <linux/atomic.h> | ||
| 10 | #include <linux/error-injection.h> | ||
| 11 | #include <linux/jiffies.h> | ||
| 12 | #include <linux/kfifo.h> | ||
| 13 | #include <linux/kref.h> | ||
| 14 | #include <linux/kthread.h> | ||
| 15 | #include <linux/ktime.h> | ||
| 16 | #include <linux/limits.h> | ||
| 17 | #include <linux/list.h> | ||
| 18 | #include <linux/lockdep.h> | ||
| 19 | #include <linux/serdev.h> | ||
| 20 | #include <linux/slab.h> | ||
| 21 | #include <linux/spinlock.h> | ||
| 22 | #include <linux/workqueue.h> | ||
| 23 | |||
| 24 | #include <linux/surface_aggregator/serial_hub.h> | ||
| 25 | |||
| 26 | #include "ssh_msgb.h" | ||
| 27 | #include "ssh_packet_layer.h" | ||
| 28 | #include "ssh_parser.h" | ||
| 29 | |||
| 30 | #include "trace.h" | ||
| 31 | |||
| 32 | /* | ||
| 33 | * To simplify reasoning about the code below, we define a few concepts. The | ||
| 34 | * system below is similar to a state-machine for packets, however, there are | ||
| 35 | * too many states to explicitly write them down. To (somewhat) manage the | ||
| 36 | * states and packets we rely on flags, reference counting, and some simple | ||
| 37 | * concepts. State transitions are triggered by actions. | ||
| 38 | * | ||
| 39 | * >> Actions << | ||
| 40 | * | ||
| 41 | * - submit | ||
| 42 | * - transmission start (process next item in queue) | ||
| 43 | * - transmission finished (guaranteed to never be parallel to transmission | ||
| 44 | * start) | ||
| 45 | * - ACK received | ||
| 46 | * - NAK received (this is equivalent to issuing re-submit for all pending | ||
| 47 | * packets) | ||
| 48 | * - timeout (this is equivalent to re-issuing a submit or canceling) | ||
| 49 | * - cancel (non-pending and pending) | ||
| 50 | * | ||
| 51 | * >> Data Structures, Packet Ownership, General Overview << | ||
| 52 | * | ||
| 53 | * The code below employs two main data structures: The packet queue, | ||
| 54 | * containing all packets scheduled for transmission, and the set of pending | ||
| 55 | * packets, containing all packets awaiting an ACK. | ||
| 56 | * | ||
| 57 | * Shared ownership of a packet is controlled via reference counting. Inside | ||
| 58 | * the transport system are a total of five packet owners: | ||
| 59 | * | ||
| 60 | * - the packet queue, | ||
| 61 | * - the pending set, | ||
| 62 | * - the transmitter thread, | ||
| 63 | * - the receiver thread (via ACKing), and | ||
| 64 | * - the timeout work item. | ||
| 65 | * | ||
| 66 | * Normal operation is as follows: The initial reference of the packet is | ||
| 67 | * obtained by submitting the packet and queuing it. The receiver thread takes | ||
| 68 | * packets from the queue. By doing this, it does not increment the refcount | ||
| 69 | * but takes over the reference (removing it from the queue). If the packet is | ||
| 70 | * sequenced (i.e. needs to be ACKed by the client), the transmitter thread | ||
| 71 | * sets-up the timeout and adds the packet to the pending set before starting | ||
| 72 | * to transmit it. As the timeout is handled by a reaper task, no additional | ||
| 73 | * reference for it is needed. After the transmit is done, the reference held | ||
| 74 | * by the transmitter thread is dropped. If the packet is unsequenced (i.e. | ||
| 75 | * does not need an ACK), the packet is completed by the transmitter thread | ||
| 76 | * before dropping that reference. | ||
| 77 | * | ||
| 78 | * On receival of an ACK, the receiver thread removes and obtains the | ||
| 79 | * reference to the packet from the pending set. The receiver thread will then | ||
| 80 | * complete the packet and drop its reference. | ||
| 81 | * | ||
| 82 | * On receival of a NAK, the receiver thread re-submits all currently pending | ||
| 83 | * packets. | ||
| 84 | * | ||
| 85 | * Packet timeouts are detected by the timeout reaper. This is a task, | ||
| 86 | * scheduled depending on the earliest packet timeout expiration date, | ||
| 87 | * checking all currently pending packets if their timeout has expired. If the | ||
| 88 | * timeout of a packet has expired, it is re-submitted and the number of tries | ||
| 89 | * of this packet is incremented. If this number reaches its limit, the packet | ||
| 90 | * will be completed with a failure. | ||
| 91 | * | ||
| 92 | * On transmission failure (such as repeated packet timeouts), the completion | ||
| 93 | * callback is immediately run by on thread on which the error was detected. | ||
| 94 | * | ||
| 95 | * To ensure that a packet eventually leaves the system it is marked as | ||
| 96 | * "locked" directly before it is going to be completed or when it is | ||
| 97 | * canceled. Marking a packet as "locked" has the effect that passing and | ||
| 98 | * creating new references of the packet is disallowed. This means that the | ||
| 99 | * packet cannot be added to the queue, the pending set, and the timeout, or | ||
| 100 | * be picked up by the transmitter thread or receiver thread. To remove a | ||
| 101 | * packet from the system it has to be marked as locked and subsequently all | ||
| 102 | * references from the data structures (queue, pending) have to be removed. | ||
| 103 | * References held by threads will eventually be dropped automatically as | ||
| 104 | * their execution progresses. | ||
| 105 | * | ||
| 106 | * Note that the packet completion callback is, in case of success and for a | ||
| 107 | * sequenced packet, guaranteed to run on the receiver thread, thus providing | ||
| 108 | * a way to reliably identify responses to the packet. The packet completion | ||
| 109 | * callback is only run once and it does not indicate that the packet has | ||
| 110 | * fully left the system (for this, one should rely on the release method, | ||
| 111 | * triggered when the reference count of the packet reaches zero). In case of | ||
| 112 | * re-submission (and with somewhat unlikely timing), it may be possible that | ||
| 113 | * the packet is being re-transmitted while the completion callback runs. | ||
| 114 | * Completion will occur both on success and internal error, as well as when | ||
| 115 | * the packet is canceled. | ||
| 116 | * | ||
| 117 | * >> Flags << | ||
| 118 | * | ||
| 119 | * Flags are used to indicate the state and progression of a packet. Some flags | ||
| 120 | * have stricter guarantees than other: | ||
| 121 | * | ||
| 122 | * - locked | ||
| 123 | * Indicates if the packet is locked. If the packet is locked, passing and/or | ||
| 124 | * creating additional references to the packet is forbidden. The packet thus | ||
| 125 | * may not be queued, dequeued, or removed or added to the pending set. Note | ||
| 126 | * that the packet state flags may still change (e.g. it may be marked as | ||
| 127 | * ACKed, transmitted, ...). | ||
| 128 | * | ||
| 129 | * - completed | ||
| 130 | * Indicates if the packet completion callback has been executed or is about | ||
| 131 | * to be executed. This flag is used to ensure that the packet completion | ||
| 132 | * callback is only run once. | ||
| 133 | * | ||
| 134 | * - queued | ||
| 135 | * Indicates if a packet is present in the submission queue or not. This flag | ||
| 136 | * must only be modified with the queue lock held, and must be coherent to the | ||
| 137 | * presence of the packet in the queue. | ||
| 138 | * | ||
| 139 | * - pending | ||
| 140 | * Indicates if a packet is present in the set of pending packets or not. | ||
| 141 | * This flag must only be modified with the pending lock held, and must be | ||
| 142 | * coherent to the presence of the packet in the pending set. | ||
| 143 | * | ||
| 144 | * - transmitting | ||
| 145 | * Indicates if the packet is currently transmitting. In case of | ||
| 146 | * re-transmissions, it is only safe to wait on the "transmitted" completion | ||
| 147 | * after this flag has been set. The completion will be set both in success | ||
| 148 | * and error case. | ||
| 149 | * | ||
| 150 | * - transmitted | ||
| 151 | * Indicates if the packet has been transmitted. This flag is not cleared by | ||
| 152 | * the system, thus it indicates the first transmission only. | ||
| 153 | * | ||
| 154 | * - acked | ||
| 155 | * Indicates if the packet has been acknowledged by the client. There are no | ||
| 156 | * other guarantees given. For example, the packet may still be canceled | ||
| 157 | * and/or the completion may be triggered an error even though this bit is | ||
| 158 | * set. Rely on the status provided to the completion callback instead. | ||
| 159 | * | ||
| 160 | * - canceled | ||
| 161 | * Indicates if the packet has been canceled from the outside. There are no | ||
| 162 | * other guarantees given. Specifically, the packet may be completed by | ||
| 163 | * another part of the system before the cancellation attempts to complete it. | ||
| 164 | * | ||
| 165 | * >> General Notes << | ||
| 166 | * | ||
| 167 | * - To avoid deadlocks, if both queue and pending locks are required, the | ||
| 168 | * pending lock must be acquired before the queue lock. | ||
| 169 | * | ||
| 170 | * - The packet priority must be accessed only while holding the queue lock. | ||
| 171 | * | ||
| 172 | * - The packet timestamp must be accessed only while holding the pending | ||
| 173 | * lock. | ||
| 174 | */ | ||
| 175 | |||
| 176 | /* | ||
| 177 | * SSH_PTL_MAX_PACKET_TRIES - Maximum transmission attempts for packet. | ||
| 178 | * | ||
| 179 | * Maximum number of transmission attempts per sequenced packet in case of | ||
| 180 | * time-outs. Must be smaller than 16. If the packet times out after this | ||
| 181 | * amount of tries, the packet will be completed with %-ETIMEDOUT as status | ||
| 182 | * code. | ||
| 183 | */ | ||
| 184 | #define SSH_PTL_MAX_PACKET_TRIES 3 | ||
| 185 | |||
| 186 | /* | ||
| 187 | * SSH_PTL_TX_TIMEOUT - Packet transmission timeout. | ||
| 188 | * | ||
| 189 | * Timeout in jiffies for packet transmission via the underlying serial | ||
| 190 | * device. If transmitting the packet takes longer than this timeout, the | ||
| 191 | * packet will be completed with -ETIMEDOUT. It will not be re-submitted. | ||
| 192 | */ | ||
| 193 | #define SSH_PTL_TX_TIMEOUT HZ | ||
| 194 | |||
| 195 | /* | ||
| 196 | * SSH_PTL_PACKET_TIMEOUT - Packet response timeout. | ||
| 197 | * | ||
| 198 | * Timeout as ktime_t delta for ACKs. If we have not received an ACK in this | ||
| 199 | * time-frame after starting transmission, the packet will be re-submitted. | ||
| 200 | */ | ||
| 201 | #define SSH_PTL_PACKET_TIMEOUT ms_to_ktime(1000) | ||
| 202 | |||
| 203 | /* | ||
| 204 | * SSH_PTL_PACKET_TIMEOUT_RESOLUTION - Packet timeout granularity. | ||
| 205 | * | ||
| 206 | * Time-resolution for timeouts. Should be larger than one jiffy to avoid | ||
| 207 | * direct re-scheduling of reaper work_struct. | ||
| 208 | */ | ||
| 209 | #define SSH_PTL_PACKET_TIMEOUT_RESOLUTION ms_to_ktime(max(2000 / HZ, 50)) | ||
| 210 | |||
| 211 | /* | ||
| 212 | * SSH_PTL_MAX_PENDING - Maximum number of pending packets. | ||
| 213 | * | ||
| 214 | * Maximum number of sequenced packets concurrently waiting for an ACK. | ||
| 215 | * Packets marked as blocking will not be transmitted while this limit is | ||
| 216 | * reached. | ||
| 217 | */ | ||
| 218 | #define SSH_PTL_MAX_PENDING 1 | ||
| 219 | |||
| 220 | /* | ||
| 221 | * SSH_PTL_RX_BUF_LEN - Evaluation-buffer size in bytes. | ||
| 222 | */ | ||
| 223 | #define SSH_PTL_RX_BUF_LEN 4096 | ||
| 224 | |||
| 225 | /* | ||
| 226 | * SSH_PTL_RX_FIFO_LEN - Fifo input-buffer size in bytes. | ||
| 227 | */ | ||
| 228 | #define SSH_PTL_RX_FIFO_LEN 4096 | ||
| 229 | |||
| 230 | #ifdef CONFIG_SURFACE_AGGREGATOR_ERROR_INJECTION | ||
| 231 | |||
| 232 | /** | ||
| 233 | * ssh_ptl_should_drop_ack_packet() - Error injection hook to drop ACK packets. | ||
| 234 | * | ||
| 235 | * Useful to test detection and handling of automated re-transmits by the EC. | ||
| 236 | * Specifically of packets that the EC considers not-ACKed but the driver | ||
| 237 | * already considers ACKed (due to dropped ACK). In this case, the EC | ||
| 238 | * re-transmits the packet-to-be-ACKed and the driver should detect it as | ||
| 239 | * duplicate/already handled. Note that the driver should still send an ACK | ||
| 240 | * for the re-transmitted packet. | ||
| 241 | */ | ||
| 242 | static noinline bool ssh_ptl_should_drop_ack_packet(void) | ||
| 243 | { | ||
| 244 | return false; | ||
| 245 | } | ||
| 246 | ALLOW_ERROR_INJECTION(ssh_ptl_should_drop_ack_packet, TRUE); | ||
| 247 | |||
| 248 | /** | ||
| 249 | * ssh_ptl_should_drop_nak_packet() - Error injection hook to drop NAK packets. | ||
| 250 | * | ||
| 251 | * Useful to test/force automated (timeout-based) re-transmit by the EC. | ||
| 252 | * Specifically, packets that have not reached the driver completely/with valid | ||
| 253 | * checksums. Only useful in combination with receival of (injected) bad data. | ||
| 254 | */ | ||
| 255 | static noinline bool ssh_ptl_should_drop_nak_packet(void) | ||
| 256 | { | ||
| 257 | return false; | ||
| 258 | } | ||
| 259 | ALLOW_ERROR_INJECTION(ssh_ptl_should_drop_nak_packet, TRUE); | ||
| 260 | |||
| 261 | /** | ||
| 262 | * ssh_ptl_should_drop_dsq_packet() - Error injection hook to drop sequenced | ||
| 263 | * data packet. | ||
| 264 | * | ||
| 265 | * Useful to test re-transmit timeout of the driver. If the data packet has not | ||
| 266 | * been ACKed after a certain time, the driver should re-transmit the packet up | ||
| 267 | * to limited number of times defined in SSH_PTL_MAX_PACKET_TRIES. | ||
| 268 | */ | ||
| 269 | static noinline bool ssh_ptl_should_drop_dsq_packet(void) | ||
| 270 | { | ||
| 271 | return false; | ||
| 272 | } | ||
| 273 | ALLOW_ERROR_INJECTION(ssh_ptl_should_drop_dsq_packet, TRUE); | ||
| 274 | |||
| 275 | /** | ||
| 276 | * ssh_ptl_should_fail_write() - Error injection hook to make | ||
| 277 | * serdev_device_write() fail. | ||
| 278 | * | ||
| 279 | * Hook to simulate errors in serdev_device_write when transmitting packets. | ||
| 280 | */ | ||
| 281 | static noinline int ssh_ptl_should_fail_write(void) | ||
| 282 | { | ||
| 283 | return 0; | ||
| 284 | } | ||
| 285 | ALLOW_ERROR_INJECTION(ssh_ptl_should_fail_write, ERRNO); | ||
| 286 | |||
| 287 | /** | ||
| 288 | * ssh_ptl_should_corrupt_tx_data() - Error injection hook to simulate invalid | ||
| 289 | * data being sent to the EC. | ||
| 290 | * | ||
| 291 | * Hook to simulate corrupt/invalid data being sent from host (driver) to EC. | ||
| 292 | * Causes the packet data to be actively corrupted by overwriting it with | ||
| 293 | * pre-defined values, such that it becomes invalid, causing the EC to respond | ||
| 294 | * with a NAK packet. Useful to test handling of NAK packets received by the | ||
| 295 | * driver. | ||
| 296 | */ | ||
| 297 | static noinline bool ssh_ptl_should_corrupt_tx_data(void) | ||
| 298 | { | ||
| 299 | return false; | ||
| 300 | } | ||
| 301 | ALLOW_ERROR_INJECTION(ssh_ptl_should_corrupt_tx_data, TRUE); | ||
| 302 | |||
| 303 | /** | ||
| 304 | * ssh_ptl_should_corrupt_rx_syn() - Error injection hook to simulate invalid | ||
| 305 | * data being sent by the EC. | ||
| 306 | * | ||
| 307 | * Hook to simulate invalid SYN bytes, i.e. an invalid start of messages and | ||
| 308 | * test handling thereof in the driver. | ||
| 309 | */ | ||
| 310 | static noinline bool ssh_ptl_should_corrupt_rx_syn(void) | ||
| 311 | { | ||
| 312 | return false; | ||
| 313 | } | ||
| 314 | ALLOW_ERROR_INJECTION(ssh_ptl_should_corrupt_rx_syn, TRUE); | ||
| 315 | |||
| 316 | /** | ||
| 317 | * ssh_ptl_should_corrupt_rx_data() - Error injection hook to simulate invalid | ||
| 318 | * data being sent by the EC. | ||
| 319 | * | ||
| 320 | * Hook to simulate invalid data/checksum of the message frame and test handling | ||
| 321 | * thereof in the driver. | ||
| 322 | */ | ||
| 323 | static noinline bool ssh_ptl_should_corrupt_rx_data(void) | ||
| 324 | { | ||
| 325 | return false; | ||
| 326 | } | ||
| 327 | ALLOW_ERROR_INJECTION(ssh_ptl_should_corrupt_rx_data, TRUE); | ||
| 328 | |||
| 329 | static bool __ssh_ptl_should_drop_ack_packet(struct ssh_packet *packet) | ||
| 330 | { | ||
| 331 | if (likely(!ssh_ptl_should_drop_ack_packet())) | ||
| 332 | return false; | ||
| 333 | |||
| 334 | trace_ssam_ei_tx_drop_ack_packet(packet); | ||
| 335 | ptl_info(packet->ptl, "packet error injection: dropping ACK packet %p\n", | ||
| 336 | packet); | ||
| 337 | |||
| 338 | return true; | ||
| 339 | } | ||
| 340 | |||
| 341 | static bool __ssh_ptl_should_drop_nak_packet(struct ssh_packet *packet) | ||
| 342 | { | ||
| 343 | if (likely(!ssh_ptl_should_drop_nak_packet())) | ||
| 344 | return false; | ||
| 345 | |||
| 346 | trace_ssam_ei_tx_drop_nak_packet(packet); | ||
| 347 | ptl_info(packet->ptl, "packet error injection: dropping NAK packet %p\n", | ||
| 348 | packet); | ||
| 349 | |||
| 350 | return true; | ||
| 351 | } | ||
| 352 | |||
| 353 | static bool __ssh_ptl_should_drop_dsq_packet(struct ssh_packet *packet) | ||
| 354 | { | ||
| 355 | if (likely(!ssh_ptl_should_drop_dsq_packet())) | ||
| 356 | return false; | ||
| 357 | |||
| 358 | trace_ssam_ei_tx_drop_dsq_packet(packet); | ||
| 359 | ptl_info(packet->ptl, | ||
| 360 | "packet error injection: dropping sequenced data packet %p\n", | ||
| 361 | packet); | ||
| 362 | |||
| 363 | return true; | ||
| 364 | } | ||
| 365 | |||
| 366 | static bool ssh_ptl_should_drop_packet(struct ssh_packet *packet) | ||
| 367 | { | ||
| 368 | /* Ignore packets that don't carry any data (i.e. flush). */ | ||
| 369 | if (!packet->data.ptr || !packet->data.len) | ||
| 370 | return false; | ||
| 371 | |||
| 372 | switch (packet->data.ptr[SSH_MSGOFFSET_FRAME(type)]) { | ||
| 373 | case SSH_FRAME_TYPE_ACK: | ||
| 374 | return __ssh_ptl_should_drop_ack_packet(packet); | ||
| 375 | |||
| 376 | case SSH_FRAME_TYPE_NAK: | ||
| 377 | return __ssh_ptl_should_drop_nak_packet(packet); | ||
| 378 | |||
| 379 | case SSH_FRAME_TYPE_DATA_SEQ: | ||
| 380 | return __ssh_ptl_should_drop_dsq_packet(packet); | ||
| 381 | |||
| 382 | default: | ||
| 383 | return false; | ||
| 384 | } | ||
| 385 | } | ||
| 386 | |||
| 387 | static int ssh_ptl_write_buf(struct ssh_ptl *ptl, struct ssh_packet *packet, | ||
| 388 | const unsigned char *buf, size_t count) | ||
| 389 | { | ||
| 390 | int status; | ||
| 391 | |||
| 392 | status = ssh_ptl_should_fail_write(); | ||
| 393 | if (unlikely(status)) { | ||
| 394 | trace_ssam_ei_tx_fail_write(packet, status); | ||
| 395 | ptl_info(packet->ptl, | ||
| 396 | "packet error injection: simulating transmit error %d, packet %p\n", | ||
| 397 | status, packet); | ||
| 398 | |||
| 399 | return status; | ||
| 400 | } | ||
| 401 | |||
| 402 | return serdev_device_write_buf(ptl->serdev, buf, count); | ||
| 403 | } | ||
| 404 | |||
| 405 | static void ssh_ptl_tx_inject_invalid_data(struct ssh_packet *packet) | ||
| 406 | { | ||
| 407 | /* Ignore packets that don't carry any data (i.e. flush). */ | ||
| 408 | if (!packet->data.ptr || !packet->data.len) | ||
| 409 | return; | ||
| 410 | |||
| 411 | /* Only allow sequenced data packets to be modified. */ | ||
| 412 | if (packet->data.ptr[SSH_MSGOFFSET_FRAME(type)] != SSH_FRAME_TYPE_DATA_SEQ) | ||
| 413 | return; | ||
| 414 | |||
| 415 | if (likely(!ssh_ptl_should_corrupt_tx_data())) | ||
| 416 | return; | ||
| 417 | |||
| 418 | trace_ssam_ei_tx_corrupt_data(packet); | ||
| 419 | ptl_info(packet->ptl, | ||
| 420 | "packet error injection: simulating invalid transmit data on packet %p\n", | ||
| 421 | packet); | ||
| 422 | |||
| 423 | /* | ||
| 424 | * NB: The value 0xb3 has been chosen more or less randomly so that it | ||
| 425 | * doesn't have any (major) overlap with the SYN bytes (aa 55) and is | ||
| 426 | * non-trivial (i.e. non-zero, non-0xff). | ||
| 427 | */ | ||
| 428 | memset(packet->data.ptr, 0xb3, packet->data.len); | ||
| 429 | } | ||
| 430 | |||
| 431 | static void ssh_ptl_rx_inject_invalid_syn(struct ssh_ptl *ptl, | ||
| 432 | struct ssam_span *data) | ||
| 433 | { | ||
| 434 | struct ssam_span frame; | ||
| 435 | |||
| 436 | /* Check if there actually is something to corrupt. */ | ||
| 437 | if (!sshp_find_syn(data, &frame)) | ||
| 438 | return; | ||
| 439 | |||
| 440 | if (likely(!ssh_ptl_should_corrupt_rx_syn())) | ||
| 441 | return; | ||
| 442 | |||
| 443 | trace_ssam_ei_rx_corrupt_syn(data->len); | ||
| 444 | |||
| 445 | data->ptr[1] = 0xb3; /* Set second byte of SYN to "random" value. */ | ||
| 446 | } | ||
| 447 | |||
| 448 | static void ssh_ptl_rx_inject_invalid_data(struct ssh_ptl *ptl, | ||
| 449 | struct ssam_span *frame) | ||
| 450 | { | ||
| 451 | size_t payload_len, message_len; | ||
| 452 | struct ssh_frame *sshf; | ||
| 453 | |||
| 454 | /* Ignore incomplete messages, will get handled once it's complete. */ | ||
| 455 | if (frame->len < SSH_MESSAGE_LENGTH(0)) | ||
| 456 | return; | ||
| 457 | |||
| 458 | /* Ignore incomplete messages, part 2. */ | ||
| 459 | payload_len = get_unaligned_le16(&frame->ptr[SSH_MSGOFFSET_FRAME(len)]); | ||
| 460 | message_len = SSH_MESSAGE_LENGTH(payload_len); | ||
| 461 | if (frame->len < message_len) | ||
| 462 | return; | ||
| 463 | |||
| 464 | if (likely(!ssh_ptl_should_corrupt_rx_data())) | ||
| 465 | return; | ||
| 466 | |||
| 467 | sshf = (struct ssh_frame *)&frame->ptr[SSH_MSGOFFSET_FRAME(type)]; | ||
| 468 | trace_ssam_ei_rx_corrupt_data(sshf); | ||
| 469 | |||
| 470 | /* | ||
| 471 | * Flip bits in first byte of payload checksum. This is basically | ||
| 472 | * equivalent to a payload/frame data error without us having to worry | ||
| 473 | * about (the, arguably pretty small, probability of) accidental | ||
| 474 | * checksum collisions. | ||
| 475 | */ | ||
| 476 | frame->ptr[frame->len - 2] = ~frame->ptr[frame->len - 2]; | ||
| 477 | } | ||
| 478 | |||
| 479 | #else /* CONFIG_SURFACE_AGGREGATOR_ERROR_INJECTION */ | ||
| 480 | |||
| 481 | static inline bool ssh_ptl_should_drop_packet(struct ssh_packet *packet) | ||
| 482 | { | ||
| 483 | return false; | ||
| 484 | } | ||
| 485 | |||
| 486 | static inline int ssh_ptl_write_buf(struct ssh_ptl *ptl, | ||
| 487 | struct ssh_packet *packet, | ||
| 488 | const unsigned char *buf, | ||
| 489 | size_t count) | ||
| 490 | { | ||
| 491 | return serdev_device_write_buf(ptl->serdev, buf, count); | ||
| 492 | } | ||
| 493 | |||
| 494 | static inline void ssh_ptl_tx_inject_invalid_data(struct ssh_packet *packet) | ||
| 495 | { | ||
| 496 | } | ||
| 497 | |||
| 498 | static inline void ssh_ptl_rx_inject_invalid_syn(struct ssh_ptl *ptl, | ||
| 499 | struct ssam_span *data) | ||
| 500 | { | ||
| 501 | } | ||
| 502 | |||
| 503 | static inline void ssh_ptl_rx_inject_invalid_data(struct ssh_ptl *ptl, | ||
| 504 | struct ssam_span *frame) | ||
| 505 | { | ||
| 506 | } | ||
| 507 | |||
| 508 | #endif /* CONFIG_SURFACE_AGGREGATOR_ERROR_INJECTION */ | ||
| 509 | |||
| 510 | static void __ssh_ptl_packet_release(struct kref *kref) | ||
| 511 | { | ||
| 512 | struct ssh_packet *p = container_of(kref, struct ssh_packet, refcnt); | ||
| 513 | |||
| 514 | trace_ssam_packet_release(p); | ||
| 515 | |||
| 516 | ptl_dbg_cond(p->ptl, "ptl: releasing packet %p\n", p); | ||
| 517 | p->ops->release(p); | ||
| 518 | } | ||
| 519 | |||
| 520 | /** | ||
| 521 | * ssh_packet_get() - Increment reference count of packet. | ||
| 522 | * @packet: The packet to increment the reference count of. | ||
| 523 | * | ||
| 524 | * Increments the reference count of the given packet. See ssh_packet_put() | ||
| 525 | * for the counter-part of this function. | ||
| 526 | * | ||
| 527 | * Return: Returns the packet provided as input. | ||
| 528 | */ | ||
| 529 | struct ssh_packet *ssh_packet_get(struct ssh_packet *packet) | ||
| 530 | { | ||
| 531 | if (packet) | ||
| 532 | kref_get(&packet->refcnt); | ||
| 533 | return packet; | ||
| 534 | } | ||
| 535 | EXPORT_SYMBOL_GPL(ssh_packet_get); | ||
| 536 | |||
| 537 | /** | ||
| 538 | * ssh_packet_put() - Decrement reference count of packet. | ||
| 539 | * @packet: The packet to decrement the reference count of. | ||
| 540 | * | ||
| 541 | * If the reference count reaches zero, the ``release`` callback specified in | ||
| 542 | * the packet's &struct ssh_packet_ops, i.e. ``packet->ops->release``, will be | ||
| 543 | * called. | ||
| 544 | * | ||
| 545 | * See ssh_packet_get() for the counter-part of this function. | ||
| 546 | */ | ||
| 547 | void ssh_packet_put(struct ssh_packet *packet) | ||
| 548 | { | ||
| 549 | if (packet) | ||
| 550 | kref_put(&packet->refcnt, __ssh_ptl_packet_release); | ||
| 551 | } | ||
| 552 | EXPORT_SYMBOL_GPL(ssh_packet_put); | ||
| 553 | |||
| 554 | static u8 ssh_packet_get_seq(struct ssh_packet *packet) | ||
| 555 | { | ||
| 556 | return packet->data.ptr[SSH_MSGOFFSET_FRAME(seq)]; | ||
| 557 | } | ||
| 558 | |||
| 559 | /** | ||
| 560 | * ssh_packet_init() - Initialize SSH packet. | ||
| 561 | * @packet: The packet to initialize. | ||
| 562 | * @type: Type-flags of the packet. | ||
| 563 | * @priority: Priority of the packet. See SSH_PACKET_PRIORITY() for details. | ||
| 564 | * @ops: Packet operations. | ||
| 565 | * | ||
| 566 | * Initializes the given SSH packet. Sets the transmission buffer pointer to | ||
| 567 | * %NULL and the transmission buffer length to zero. For data-type packets, | ||
| 568 | * this buffer has to be set separately via ssh_packet_set_data() before | ||
| 569 | * submission, and must contain a valid SSH message, i.e. frame with optional | ||
| 570 | * payload of any type. | ||
| 571 | */ | ||
| 572 | void ssh_packet_init(struct ssh_packet *packet, unsigned long type, | ||
| 573 | u8 priority, const struct ssh_packet_ops *ops) | ||
| 574 | { | ||
| 575 | kref_init(&packet->refcnt); | ||
| 576 | |||
| 577 | packet->ptl = NULL; | ||
| 578 | INIT_LIST_HEAD(&packet->queue_node); | ||
| 579 | INIT_LIST_HEAD(&packet->pending_node); | ||
| 580 | |||
| 581 | packet->state = type & SSH_PACKET_FLAGS_TY_MASK; | ||
| 582 | packet->priority = priority; | ||
| 583 | packet->timestamp = KTIME_MAX; | ||
| 584 | |||
| 585 | packet->data.ptr = NULL; | ||
| 586 | packet->data.len = 0; | ||
| 587 | |||
| 588 | packet->ops = ops; | ||
| 589 | } | ||
| 590 | |||
| 591 | static struct kmem_cache *ssh_ctrl_packet_cache; | ||
| 592 | |||
| 593 | /** | ||
| 594 | * ssh_ctrl_packet_cache_init() - Initialize the control packet cache. | ||
| 595 | */ | ||
| 596 | int ssh_ctrl_packet_cache_init(void) | ||
| 597 | { | ||
| 598 | const unsigned int size = sizeof(struct ssh_packet) + SSH_MSG_LEN_CTRL; | ||
| 599 | const unsigned int align = __alignof__(struct ssh_packet); | ||
| 600 | struct kmem_cache *cache; | ||
| 601 | |||
| 602 | cache = kmem_cache_create("ssam_ctrl_packet", size, align, 0, NULL); | ||
| 603 | if (!cache) | ||
| 604 | return -ENOMEM; | ||
| 605 | |||
| 606 | ssh_ctrl_packet_cache = cache; | ||
| 607 | return 0; | ||
| 608 | } | ||
| 609 | |||
| 610 | /** | ||
| 611 | * ssh_ctrl_packet_cache_destroy() - Deinitialize the control packet cache. | ||
| 612 | */ | ||
| 613 | void ssh_ctrl_packet_cache_destroy(void) | ||
| 614 | { | ||
| 615 | kmem_cache_destroy(ssh_ctrl_packet_cache); | ||
| 616 | ssh_ctrl_packet_cache = NULL; | ||
| 617 | } | ||
| 618 | |||
| 619 | /** | ||
| 620 | * ssh_ctrl_packet_alloc() - Allocate packet from control packet cache. | ||
| 621 | * @packet: Where the pointer to the newly allocated packet should be stored. | ||
| 622 | * @buffer: The buffer corresponding to this packet. | ||
| 623 | * @flags: Flags used for allocation. | ||
| 624 | * | ||
| 625 | * Allocates a packet and corresponding transport buffer from the control | ||
| 626 | * packet cache. Sets the packet's buffer reference to the allocated buffer. | ||
| 627 | * The packet must be freed via ssh_ctrl_packet_free(), which will also free | ||
| 628 | * the corresponding buffer. The corresponding buffer must not be freed | ||
| 629 | * separately. Intended to be used with %ssh_ptl_ctrl_packet_ops as packet | ||
| 630 | * operations. | ||
| 631 | * | ||
| 632 | * Return: Returns zero on success, %-ENOMEM if the allocation failed. | ||
| 633 | */ | ||
| 634 | static int ssh_ctrl_packet_alloc(struct ssh_packet **packet, | ||
| 635 | struct ssam_span *buffer, gfp_t flags) | ||
| 636 | { | ||
| 637 | *packet = kmem_cache_alloc(ssh_ctrl_packet_cache, flags); | ||
| 638 | if (!*packet) | ||
| 639 | return -ENOMEM; | ||
| 640 | |||
| 641 | buffer->ptr = (u8 *)(*packet + 1); | ||
| 642 | buffer->len = SSH_MSG_LEN_CTRL; | ||
| 643 | |||
| 644 | trace_ssam_ctrl_packet_alloc(*packet, buffer->len); | ||
| 645 | return 0; | ||
| 646 | } | ||
| 647 | |||
| 648 | /** | ||
| 649 | * ssh_ctrl_packet_free() - Free packet allocated from control packet cache. | ||
| 650 | * @p: The packet to free. | ||
| 651 | */ | ||
| 652 | static void ssh_ctrl_packet_free(struct ssh_packet *p) | ||
| 653 | { | ||
| 654 | trace_ssam_ctrl_packet_free(p); | ||
| 655 | kmem_cache_free(ssh_ctrl_packet_cache, p); | ||
| 656 | } | ||
| 657 | |||
| 658 | static const struct ssh_packet_ops ssh_ptl_ctrl_packet_ops = { | ||
| 659 | .complete = NULL, | ||
| 660 | .release = ssh_ctrl_packet_free, | ||
| 661 | }; | ||
| 662 | |||
| 663 | static void ssh_ptl_timeout_reaper_mod(struct ssh_ptl *ptl, ktime_t now, | ||
| 664 | ktime_t expires) | ||
| 665 | { | ||
| 666 | unsigned long delta = msecs_to_jiffies(ktime_ms_delta(expires, now)); | ||
| 667 | ktime_t aexp = ktime_add(expires, SSH_PTL_PACKET_TIMEOUT_RESOLUTION); | ||
| 668 | |||
| 669 | spin_lock(&ptl->rtx_timeout.lock); | ||
| 670 | |||
| 671 | /* Re-adjust / schedule reaper only if it is above resolution delta. */ | ||
| 672 | if (ktime_before(aexp, ptl->rtx_timeout.expires)) { | ||
| 673 | ptl->rtx_timeout.expires = expires; | ||
| 674 | mod_delayed_work(system_wq, &ptl->rtx_timeout.reaper, delta); | ||
| 675 | } | ||
| 676 | |||
| 677 | spin_unlock(&ptl->rtx_timeout.lock); | ||
| 678 | } | ||
| 679 | |||
| 680 | /* Must be called with queue lock held. */ | ||
| 681 | static void ssh_packet_next_try(struct ssh_packet *p) | ||
| 682 | { | ||
| 683 | u8 base = ssh_packet_priority_get_base(p->priority); | ||
| 684 | u8 try = ssh_packet_priority_get_try(p->priority); | ||
| 685 | |||
| 686 | lockdep_assert_held(&p->ptl->queue.lock); | ||
| 687 | |||
| 688 | /* | ||
| 689 | * Ensure that we write the priority in one go via WRITE_ONCE() so we | ||
| 690 | * can access it via READ_ONCE() for tracing. Note that other access | ||
| 691 | * is guarded by the queue lock, so no need to use READ_ONCE() there. | ||
| 692 | */ | ||
| 693 | WRITE_ONCE(p->priority, __SSH_PACKET_PRIORITY(base, try + 1)); | ||
| 694 | } | ||
| 695 | |||
| 696 | /* Must be called with queue lock held. */ | ||
| 697 | static struct list_head *__ssh_ptl_queue_find_entrypoint(struct ssh_packet *p) | ||
| 698 | { | ||
| 699 | struct list_head *head; | ||
| 700 | struct ssh_packet *q; | ||
| 701 | |||
| 702 | lockdep_assert_held(&p->ptl->queue.lock); | ||
| 703 | |||
| 704 | /* | ||
| 705 | * We generally assume that there are less control (ACK/NAK) packets | ||
| 706 | * and re-submitted data packets as there are normal data packets (at | ||
| 707 | * least in situations in which many packets are queued; if there | ||
| 708 | * aren't many packets queued the decision on how to iterate should be | ||
| 709 | * basically irrelevant; the number of control/data packets is more or | ||
| 710 | * less limited via the maximum number of pending packets). Thus, when | ||
| 711 | * inserting a control or re-submitted data packet, (determined by | ||
| 712 | * their priority), we search from front to back. Normal data packets | ||
| 713 | * are, usually queued directly at the tail of the queue, so for those | ||
| 714 | * search from back to front. | ||
| 715 | */ | ||
| 716 | |||
| 717 | if (p->priority > SSH_PACKET_PRIORITY(DATA, 0)) { | ||
| 718 | list_for_each(head, &p->ptl->queue.head) { | ||
| 719 | q = list_entry(head, struct ssh_packet, queue_node); | ||
| 720 | |||
| 721 | if (q->priority < p->priority) | ||
| 722 | break; | ||
| 723 | } | ||
| 724 | } else { | ||
| 725 | list_for_each_prev(head, &p->ptl->queue.head) { | ||
| 726 | q = list_entry(head, struct ssh_packet, queue_node); | ||
| 727 | |||
| 728 | if (q->priority >= p->priority) { | ||
| 729 | head = head->next; | ||
| 730 | break; | ||
| 731 | } | ||
| 732 | } | ||
| 733 | } | ||
| 734 | |||
| 735 | return head; | ||
| 736 | } | ||
| 737 | |||
| 738 | /* Must be called with queue lock held. */ | ||
| 739 | static int __ssh_ptl_queue_push(struct ssh_packet *packet) | ||
| 740 | { | ||
| 741 | struct ssh_ptl *ptl = packet->ptl; | ||
| 742 | struct list_head *head; | ||
| 743 | |||
| 744 | lockdep_assert_held(&ptl->queue.lock); | ||
| 745 | |||
| 746 | if (test_bit(SSH_PTL_SF_SHUTDOWN_BIT, &ptl->state)) | ||
| 747 | return -ESHUTDOWN; | ||
| 748 | |||
| 749 | /* Avoid further transitions when canceling/completing. */ | ||
| 750 | if (test_bit(SSH_PACKET_SF_LOCKED_BIT, &packet->state)) | ||
| 751 | return -EINVAL; | ||
| 752 | |||
| 753 | /* If this packet has already been queued, do not add it. */ | ||
| 754 | if (test_and_set_bit(SSH_PACKET_SF_QUEUED_BIT, &packet->state)) | ||
| 755 | return -EALREADY; | ||
| 756 | |||
| 757 | head = __ssh_ptl_queue_find_entrypoint(packet); | ||
| 758 | |||
| 759 | list_add_tail(&ssh_packet_get(packet)->queue_node, head); | ||
| 760 | return 0; | ||
| 761 | } | ||
| 762 | |||
| 763 | static int ssh_ptl_queue_push(struct ssh_packet *packet) | ||
| 764 | { | ||
| 765 | int status; | ||
| 766 | |||
| 767 | spin_lock(&packet->ptl->queue.lock); | ||
| 768 | status = __ssh_ptl_queue_push(packet); | ||
| 769 | spin_unlock(&packet->ptl->queue.lock); | ||
| 770 | |||
| 771 | return status; | ||
| 772 | } | ||
| 773 | |||
| 774 | static void ssh_ptl_queue_remove(struct ssh_packet *packet) | ||
| 775 | { | ||
| 776 | struct ssh_ptl *ptl = packet->ptl; | ||
| 777 | |||
| 778 | spin_lock(&ptl->queue.lock); | ||
| 779 | |||
| 780 | if (!test_and_clear_bit(SSH_PACKET_SF_QUEUED_BIT, &packet->state)) { | ||
| 781 | spin_unlock(&ptl->queue.lock); | ||
| 782 | return; | ||
| 783 | } | ||
| 784 | |||
| 785 | list_del(&packet->queue_node); | ||
| 786 | |||
| 787 | spin_unlock(&ptl->queue.lock); | ||
| 788 | ssh_packet_put(packet); | ||
| 789 | } | ||
| 790 | |||
| 791 | static void ssh_ptl_pending_push(struct ssh_packet *p) | ||
| 792 | { | ||
| 793 | struct ssh_ptl *ptl = p->ptl; | ||
| 794 | const ktime_t timestamp = ktime_get_coarse_boottime(); | ||
| 795 | const ktime_t timeout = ptl->rtx_timeout.timeout; | ||
| 796 | |||
| 797 | /* | ||
| 798 | * Note: We can get the time for the timestamp before acquiring the | ||
| 799 | * lock as this is the only place we're setting it and this function | ||
| 800 | * is called only from the transmitter thread. Thus it is not possible | ||
| 801 | * to overwrite the timestamp with an outdated value below. | ||
| 802 | */ | ||
| 803 | |||
| 804 | spin_lock(&ptl->pending.lock); | ||
| 805 | |||
| 806 | /* If we are canceling/completing this packet, do not add it. */ | ||
| 807 | if (test_bit(SSH_PACKET_SF_LOCKED_BIT, &p->state)) { | ||
| 808 | spin_unlock(&ptl->pending.lock); | ||
| 809 | return; | ||
| 810 | } | ||
| 811 | |||
| 812 | /* | ||
| 813 | * On re-submission, the packet has already been added the pending | ||
| 814 | * set. We still need to update the timestamp as the packet timeout is | ||
| 815 | * reset for each (re-)submission. | ||
| 816 | */ | ||
| 817 | p->timestamp = timestamp; | ||
| 818 | |||
| 819 | /* In case it is already pending (e.g. re-submission), do not add it. */ | ||
| 820 | if (!test_and_set_bit(SSH_PACKET_SF_PENDING_BIT, &p->state)) { | ||
| 821 | atomic_inc(&ptl->pending.count); | ||
| 822 | list_add_tail(&ssh_packet_get(p)->pending_node, &ptl->pending.head); | ||
| 823 | } | ||
| 824 | |||
| 825 | spin_unlock(&ptl->pending.lock); | ||
| 826 | |||
| 827 | /* Arm/update timeout reaper. */ | ||
| 828 | ssh_ptl_timeout_reaper_mod(ptl, timestamp, timestamp + timeout); | ||
| 829 | } | ||
| 830 | |||
| 831 | static void ssh_ptl_pending_remove(struct ssh_packet *packet) | ||
| 832 | { | ||
| 833 | struct ssh_ptl *ptl = packet->ptl; | ||
| 834 | |||
| 835 | spin_lock(&ptl->pending.lock); | ||
| 836 | |||
| 837 | if (!test_and_clear_bit(SSH_PACKET_SF_PENDING_BIT, &packet->state)) { | ||
| 838 | spin_unlock(&ptl->pending.lock); | ||
| 839 | return; | ||
| 840 | } | ||
| 841 | |||
| 842 | list_del(&packet->pending_node); | ||
| 843 | atomic_dec(&ptl->pending.count); | ||
| 844 | |||
| 845 | spin_unlock(&ptl->pending.lock); | ||
| 846 | |||
| 847 | ssh_packet_put(packet); | ||
| 848 | } | ||
| 849 | |||
| 850 | /* Warning: Does not check/set "completed" bit. */ | ||
| 851 | static void __ssh_ptl_complete(struct ssh_packet *p, int status) | ||
| 852 | { | ||
| 853 | struct ssh_ptl *ptl = READ_ONCE(p->ptl); | ||
| 854 | |||
| 855 | trace_ssam_packet_complete(p, status); | ||
| 856 | ptl_dbg_cond(ptl, "ptl: completing packet %p (status: %d)\n", p, status); | ||
| 857 | |||
| 858 | if (p->ops->complete) | ||
| 859 | p->ops->complete(p, status); | ||
| 860 | } | ||
| 861 | |||
| 862 | static void ssh_ptl_remove_and_complete(struct ssh_packet *p, int status) | ||
| 863 | { | ||
| 864 | /* | ||
| 865 | * A call to this function should in general be preceded by | ||
| 866 | * set_bit(SSH_PACKET_SF_LOCKED_BIT, &p->flags) to avoid re-adding the | ||
| 867 | * packet to the structures it's going to be removed from. | ||
| 868 | * | ||
| 869 | * The set_bit call does not need explicit memory barriers as the | ||
| 870 | * implicit barrier of the test_and_set_bit() call below ensure that the | ||
| 871 | * flag is visible before we actually attempt to remove the packet. | ||
| 872 | */ | ||
| 873 | |||
| 874 | if (test_and_set_bit(SSH_PACKET_SF_COMPLETED_BIT, &p->state)) | ||
| 875 | return; | ||
| 876 | |||
| 877 | ssh_ptl_queue_remove(p); | ||
| 878 | ssh_ptl_pending_remove(p); | ||
| 879 | |||
| 880 | __ssh_ptl_complete(p, status); | ||
| 881 | } | ||
| 882 | |||
| 883 | static bool ssh_ptl_tx_can_process(struct ssh_packet *packet) | ||
| 884 | { | ||
| 885 | struct ssh_ptl *ptl = packet->ptl; | ||
| 886 | |||
| 887 | if (test_bit(SSH_PACKET_TY_FLUSH_BIT, &packet->state)) | ||
| 888 | return !atomic_read(&ptl->pending.count); | ||
| 889 | |||
| 890 | /* We can always process non-blocking packets. */ | ||
| 891 | if (!test_bit(SSH_PACKET_TY_BLOCKING_BIT, &packet->state)) | ||
| 892 | return true; | ||
| 893 | |||
| 894 | /* If we are already waiting for this packet, send it again. */ | ||
| 895 | if (test_bit(SSH_PACKET_SF_PENDING_BIT, &packet->state)) | ||
| 896 | return true; | ||
| 897 | |||
| 898 | /* Otherwise: Check if we have the capacity to send. */ | ||
| 899 | return atomic_read(&ptl->pending.count) < SSH_PTL_MAX_PENDING; | ||
| 900 | } | ||
| 901 | |||
| 902 | static struct ssh_packet *ssh_ptl_tx_pop(struct ssh_ptl *ptl) | ||
| 903 | { | ||
| 904 | struct ssh_packet *packet = ERR_PTR(-ENOENT); | ||
| 905 | struct ssh_packet *p, *n; | ||
| 906 | |||
| 907 | spin_lock(&ptl->queue.lock); | ||
| 908 | list_for_each_entry_safe(p, n, &ptl->queue.head, queue_node) { | ||
| 909 | /* | ||
| 910 | * If we are canceling or completing this packet, ignore it. | ||
| 911 | * It's going to be removed from this queue shortly. | ||
| 912 | */ | ||
| 913 | if (test_bit(SSH_PACKET_SF_LOCKED_BIT, &p->state)) | ||
| 914 | continue; | ||
| 915 | |||
| 916 | /* | ||
| 917 | * Packets should be ordered non-blocking/to-be-resent first. | ||
| 918 | * If we cannot process this packet, assume that we can't | ||
| 919 | * process any following packet either and abort. | ||
| 920 | */ | ||
| 921 | if (!ssh_ptl_tx_can_process(p)) { | ||
| 922 | packet = ERR_PTR(-EBUSY); | ||
| 923 | break; | ||
| 924 | } | ||
| 925 | |||
| 926 | /* | ||
| 927 | * We are allowed to change the state now. Remove it from the | ||
| 928 | * queue and mark it as being transmitted. | ||
| 929 | */ | ||
| 930 | |||
| 931 | list_del(&p->queue_node); | ||
| 932 | |||
| 933 | set_bit(SSH_PACKET_SF_TRANSMITTING_BIT, &p->state); | ||
| 934 | /* Ensure that state never gets zero. */ | ||
| 935 | smp_mb__before_atomic(); | ||
| 936 | clear_bit(SSH_PACKET_SF_QUEUED_BIT, &p->state); | ||
| 937 | |||
| 938 | /* | ||
| 939 | * Update number of tries. This directly influences the | ||
| 940 | * priority in case the packet is re-submitted (e.g. via | ||
| 941 | * timeout/NAK). Note that all reads and writes to the | ||
| 942 | * priority after the first submission are guarded by the | ||
| 943 | * queue lock. | ||
| 944 | */ | ||
| 945 | ssh_packet_next_try(p); | ||
| 946 | |||
| 947 | packet = p; | ||
| 948 | break; | ||
| 949 | } | ||
| 950 | spin_unlock(&ptl->queue.lock); | ||
| 951 | |||
| 952 | return packet; | ||
| 953 | } | ||
| 954 | |||
| 955 | static struct ssh_packet *ssh_ptl_tx_next(struct ssh_ptl *ptl) | ||
| 956 | { | ||
| 957 | struct ssh_packet *p; | ||
| 958 | |||
| 959 | p = ssh_ptl_tx_pop(ptl); | ||
| 960 | if (IS_ERR(p)) | ||
| 961 | return p; | ||
| 962 | |||
| 963 | if (test_bit(SSH_PACKET_TY_SEQUENCED_BIT, &p->state)) { | ||
| 964 | ptl_dbg(ptl, "ptl: transmitting sequenced packet %p\n", p); | ||
| 965 | ssh_ptl_pending_push(p); | ||
| 966 | } else { | ||
| 967 | ptl_dbg(ptl, "ptl: transmitting non-sequenced packet %p\n", p); | ||
| 968 | } | ||
| 969 | |||
| 970 | return p; | ||
| 971 | } | ||
| 972 | |||
| 973 | static void ssh_ptl_tx_compl_success(struct ssh_packet *packet) | ||
| 974 | { | ||
| 975 | struct ssh_ptl *ptl = packet->ptl; | ||
| 976 | |||
| 977 | ptl_dbg(ptl, "ptl: successfully transmitted packet %p\n", packet); | ||
| 978 | |||
| 979 | /* Transition state to "transmitted". */ | ||
| 980 | set_bit(SSH_PACKET_SF_TRANSMITTED_BIT, &packet->state); | ||
| 981 | /* Ensure that state never gets zero. */ | ||
| 982 | smp_mb__before_atomic(); | ||
| 983 | clear_bit(SSH_PACKET_SF_TRANSMITTING_BIT, &packet->state); | ||
| 984 | |||
| 985 | /* If the packet is unsequenced, we're done: Lock and complete. */ | ||
| 986 | if (!test_bit(SSH_PACKET_TY_SEQUENCED_BIT, &packet->state)) { | ||
| 987 | set_bit(SSH_PACKET_SF_LOCKED_BIT, &packet->state); | ||
| 988 | ssh_ptl_remove_and_complete(packet, 0); | ||
| 989 | } | ||
| 990 | |||
| 991 | /* | ||
| 992 | * Notify that a packet transmission has finished. In general we're only | ||
| 993 | * waiting for one packet (if any), so wake_up_all should be fine. | ||
| 994 | */ | ||
| 995 | wake_up_all(&ptl->tx.packet_wq); | ||
| 996 | } | ||
| 997 | |||
| 998 | static void ssh_ptl_tx_compl_error(struct ssh_packet *packet, int status) | ||
| 999 | { | ||
| 1000 | /* Transmission failure: Lock the packet and try to complete it. */ | ||
| 1001 | set_bit(SSH_PACKET_SF_LOCKED_BIT, &packet->state); | ||
| 1002 | /* Ensure that state never gets zero. */ | ||
| 1003 | smp_mb__before_atomic(); | ||
| 1004 | clear_bit(SSH_PACKET_SF_TRANSMITTING_BIT, &packet->state); | ||
| 1005 | |||
| 1006 | ptl_err(packet->ptl, "ptl: transmission error: %d\n", status); | ||
| 1007 | ptl_dbg(packet->ptl, "ptl: failed to transmit packet: %p\n", packet); | ||
| 1008 | |||
| 1009 | ssh_ptl_remove_and_complete(packet, status); | ||
| 1010 | |||
| 1011 | /* | ||
| 1012 | * Notify that a packet transmission has finished. In general we're only | ||
| 1013 | * waiting for one packet (if any), so wake_up_all should be fine. | ||
| 1014 | */ | ||
| 1015 | wake_up_all(&packet->ptl->tx.packet_wq); | ||
| 1016 | } | ||
| 1017 | |||
| 1018 | static long ssh_ptl_tx_wait_packet(struct ssh_ptl *ptl) | ||
| 1019 | { | ||
| 1020 | int status; | ||
| 1021 | |||
| 1022 | status = wait_for_completion_interruptible(&ptl->tx.thread_cplt_pkt); | ||
| 1023 | reinit_completion(&ptl->tx.thread_cplt_pkt); | ||
| 1024 | |||
| 1025 | /* | ||
| 1026 | * Ensure completion is cleared before continuing to avoid lost update | ||
| 1027 | * problems. | ||
| 1028 | */ | ||
| 1029 | smp_mb__after_atomic(); | ||
| 1030 | |||
| 1031 | return status; | ||
| 1032 | } | ||
| 1033 | |||
| 1034 | static long ssh_ptl_tx_wait_transfer(struct ssh_ptl *ptl, long timeout) | ||
| 1035 | { | ||
| 1036 | long status; | ||
| 1037 | |||
| 1038 | status = wait_for_completion_interruptible_timeout(&ptl->tx.thread_cplt_tx, | ||
| 1039 | timeout); | ||
| 1040 | reinit_completion(&ptl->tx.thread_cplt_tx); | ||
| 1041 | |||
| 1042 | /* | ||
| 1043 | * Ensure completion is cleared before continuing to avoid lost update | ||
| 1044 | * problems. | ||
| 1045 | */ | ||
| 1046 | smp_mb__after_atomic(); | ||
| 1047 | |||
| 1048 | return status; | ||
| 1049 | } | ||
| 1050 | |||
| 1051 | static int ssh_ptl_tx_packet(struct ssh_ptl *ptl, struct ssh_packet *packet) | ||
| 1052 | { | ||
| 1053 | long timeout = SSH_PTL_TX_TIMEOUT; | ||
| 1054 | size_t offset = 0; | ||
| 1055 | |||
| 1056 | /* Note: Flush-packets don't have any data. */ | ||
| 1057 | if (unlikely(!packet->data.ptr)) | ||
| 1058 | return 0; | ||
| 1059 | |||
| 1060 | /* Error injection: drop packet to simulate transmission problem. */ | ||
| 1061 | if (ssh_ptl_should_drop_packet(packet)) | ||
| 1062 | return 0; | ||
| 1063 | |||
| 1064 | /* Error injection: simulate invalid packet data. */ | ||
| 1065 | ssh_ptl_tx_inject_invalid_data(packet); | ||
| 1066 | |||
| 1067 | ptl_dbg(ptl, "tx: sending data (length: %zu)\n", packet->data.len); | ||
| 1068 | print_hex_dump_debug("tx: ", DUMP_PREFIX_OFFSET, 16, 1, | ||
| 1069 | packet->data.ptr, packet->data.len, false); | ||
| 1070 | |||
| 1071 | do { | ||
| 1072 | ssize_t status, len; | ||
| 1073 | u8 *buf; | ||
| 1074 | |||
| 1075 | buf = packet->data.ptr + offset; | ||
| 1076 | len = packet->data.len - offset; | ||
| 1077 | |||
| 1078 | status = ssh_ptl_write_buf(ptl, packet, buf, len); | ||
| 1079 | if (status < 0) | ||
| 1080 | return status; | ||
| 1081 | |||
| 1082 | if (status == len) | ||
| 1083 | return 0; | ||
| 1084 | |||
| 1085 | offset += status; | ||
| 1086 | |||
| 1087 | timeout = ssh_ptl_tx_wait_transfer(ptl, timeout); | ||
| 1088 | if (kthread_should_stop() || !atomic_read(&ptl->tx.running)) | ||
| 1089 | return -ESHUTDOWN; | ||
| 1090 | |||
| 1091 | if (timeout < 0) | ||
| 1092 | return -EINTR; | ||
| 1093 | |||
| 1094 | if (timeout == 0) | ||
| 1095 | return -ETIMEDOUT; | ||
| 1096 | } while (true); | ||
| 1097 | } | ||
| 1098 | |||
| 1099 | static int ssh_ptl_tx_threadfn(void *data) | ||
| 1100 | { | ||
| 1101 | struct ssh_ptl *ptl = data; | ||
| 1102 | |||
| 1103 | while (!kthread_should_stop() && atomic_read(&ptl->tx.running)) { | ||
| 1104 | struct ssh_packet *packet; | ||
| 1105 | int status; | ||
| 1106 | |||
| 1107 | /* Try to get the next packet. */ | ||
| 1108 | packet = ssh_ptl_tx_next(ptl); | ||
| 1109 | |||
| 1110 | /* If no packet can be processed, we are done. */ | ||
| 1111 | if (IS_ERR(packet)) { | ||
| 1112 | ssh_ptl_tx_wait_packet(ptl); | ||
| 1113 | continue; | ||
| 1114 | } | ||
| 1115 | |||
| 1116 | /* Transfer and complete packet. */ | ||
| 1117 | status = ssh_ptl_tx_packet(ptl, packet); | ||
| 1118 | if (status) | ||
| 1119 | ssh_ptl_tx_compl_error(packet, status); | ||
| 1120 | else | ||
| 1121 | ssh_ptl_tx_compl_success(packet); | ||
| 1122 | |||
| 1123 | ssh_packet_put(packet); | ||
| 1124 | } | ||
| 1125 | |||
| 1126 | return 0; | ||
| 1127 | } | ||
| 1128 | |||
| 1129 | /** | ||
| 1130 | * ssh_ptl_tx_wakeup_packet() - Wake up packet transmitter thread for new | ||
| 1131 | * packet. | ||
| 1132 | * @ptl: The packet transport layer. | ||
| 1133 | * | ||
| 1134 | * Wakes up the packet transmitter thread, notifying it that a new packet has | ||
| 1135 | * arrived and is ready for transfer. If the packet transport layer has been | ||
| 1136 | * shut down, calls to this function will be ignored. | ||
| 1137 | */ | ||
| 1138 | static void ssh_ptl_tx_wakeup_packet(struct ssh_ptl *ptl) | ||
| 1139 | { | ||
| 1140 | if (test_bit(SSH_PTL_SF_SHUTDOWN_BIT, &ptl->state)) | ||
| 1141 | return; | ||
| 1142 | |||
| 1143 | complete(&ptl->tx.thread_cplt_pkt); | ||
| 1144 | } | ||
| 1145 | |||
| 1146 | /** | ||
| 1147 | * ssh_ptl_tx_start() - Start packet transmitter thread. | ||
| 1148 | * @ptl: The packet transport layer. | ||
| 1149 | * | ||
| 1150 | * Return: Returns zero on success, a negative error code on failure. | ||
| 1151 | */ | ||
| 1152 | int ssh_ptl_tx_start(struct ssh_ptl *ptl) | ||
| 1153 | { | ||
| 1154 | atomic_set_release(&ptl->tx.running, 1); | ||
| 1155 | |||
| 1156 | ptl->tx.thread = kthread_run(ssh_ptl_tx_threadfn, ptl, "ssam_serial_hub-tx"); | ||
| 1157 | if (IS_ERR(ptl->tx.thread)) | ||
| 1158 | return PTR_ERR(ptl->tx.thread); | ||
| 1159 | |||
| 1160 | return 0; | ||
| 1161 | } | ||
| 1162 | |||
| 1163 | /** | ||
| 1164 | * ssh_ptl_tx_stop() - Stop packet transmitter thread. | ||
| 1165 | * @ptl: The packet transport layer. | ||
| 1166 | * | ||
| 1167 | * Return: Returns zero on success, a negative error code on failure. | ||
| 1168 | */ | ||
| 1169 | int ssh_ptl_tx_stop(struct ssh_ptl *ptl) | ||
| 1170 | { | ||
| 1171 | int status = 0; | ||
| 1172 | |||
| 1173 | if (!IS_ERR_OR_NULL(ptl->tx.thread)) { | ||
| 1174 | /* Tell thread to stop. */ | ||
| 1175 | atomic_set_release(&ptl->tx.running, 0); | ||
| 1176 | |||
| 1177 | /* | ||
| 1178 | * Wake up thread in case it is paused. Do not use wakeup | ||
| 1179 | * helpers as this may be called when the shutdown bit has | ||
| 1180 | * already been set. | ||
| 1181 | */ | ||
| 1182 | complete(&ptl->tx.thread_cplt_pkt); | ||
| 1183 | complete(&ptl->tx.thread_cplt_tx); | ||
| 1184 | |||
| 1185 | /* Finally, wait for thread to stop. */ | ||
| 1186 | status = kthread_stop(ptl->tx.thread); | ||
| 1187 | ptl->tx.thread = NULL; | ||
| 1188 | } | ||
| 1189 | |||
| 1190 | return status; | ||
| 1191 | } | ||
| 1192 | |||
| 1193 | static struct ssh_packet *ssh_ptl_ack_pop(struct ssh_ptl *ptl, u8 seq_id) | ||
| 1194 | { | ||
| 1195 | struct ssh_packet *packet = ERR_PTR(-ENOENT); | ||
| 1196 | struct ssh_packet *p, *n; | ||
| 1197 | |||
| 1198 | spin_lock(&ptl->pending.lock); | ||
| 1199 | list_for_each_entry_safe(p, n, &ptl->pending.head, pending_node) { | ||
| 1200 | /* | ||
| 1201 | * We generally expect packets to be in order, so first packet | ||
| 1202 | * to be added to pending is first to be sent, is first to be | ||
| 1203 | * ACKed. | ||
| 1204 | */ | ||
| 1205 | if (unlikely(ssh_packet_get_seq(p) != seq_id)) | ||
| 1206 | continue; | ||
| 1207 | |||
| 1208 | /* | ||
| 1209 | * In case we receive an ACK while handling a transmission | ||
| 1210 | * error completion. The packet will be removed shortly. | ||
| 1211 | */ | ||
| 1212 | if (unlikely(test_bit(SSH_PACKET_SF_LOCKED_BIT, &p->state))) { | ||
| 1213 | packet = ERR_PTR(-EPERM); | ||
| 1214 | break; | ||
| 1215 | } | ||
| 1216 | |||
| 1217 | /* | ||
| 1218 | * Mark the packet as ACKed and remove it from pending by | ||
| 1219 | * removing its node and decrementing the pending counter. | ||
| 1220 | */ | ||
| 1221 | set_bit(SSH_PACKET_SF_ACKED_BIT, &p->state); | ||
| 1222 | /* Ensure that state never gets zero. */ | ||
| 1223 | smp_mb__before_atomic(); | ||
| 1224 | clear_bit(SSH_PACKET_SF_PENDING_BIT, &p->state); | ||
| 1225 | |||
| 1226 | atomic_dec(&ptl->pending.count); | ||
| 1227 | list_del(&p->pending_node); | ||
| 1228 | packet = p; | ||
| 1229 | |||
| 1230 | break; | ||
| 1231 | } | ||
| 1232 | spin_unlock(&ptl->pending.lock); | ||
| 1233 | |||
| 1234 | return packet; | ||
| 1235 | } | ||
| 1236 | |||
| 1237 | static void ssh_ptl_wait_until_transmitted(struct ssh_packet *packet) | ||
| 1238 | { | ||
| 1239 | wait_event(packet->ptl->tx.packet_wq, | ||
| 1240 | test_bit(SSH_PACKET_SF_TRANSMITTED_BIT, &packet->state) || | ||
| 1241 | test_bit(SSH_PACKET_SF_LOCKED_BIT, &packet->state)); | ||
| 1242 | } | ||
| 1243 | |||
| 1244 | static void ssh_ptl_acknowledge(struct ssh_ptl *ptl, u8 seq) | ||
| 1245 | { | ||
| 1246 | struct ssh_packet *p; | ||
| 1247 | |||
| 1248 | p = ssh_ptl_ack_pop(ptl, seq); | ||
| 1249 | if (IS_ERR(p)) { | ||
| 1250 | if (PTR_ERR(p) == -ENOENT) { | ||
| 1251 | /* | ||
| 1252 | * The packet has not been found in the set of pending | ||
| 1253 | * packets. | ||
| 1254 | */ | ||
| 1255 | ptl_warn(ptl, "ptl: received ACK for non-pending packet\n"); | ||
| 1256 | } else { | ||
| 1257 | /* | ||
| 1258 | * The packet is pending, but we are not allowed to take | ||
| 1259 | * it because it has been locked. | ||
| 1260 | */ | ||
| 1261 | WARN_ON(PTR_ERR(p) != -EPERM); | ||
| 1262 | } | ||
| 1263 | return; | ||
| 1264 | } | ||
| 1265 | |||
| 1266 | ptl_dbg(ptl, "ptl: received ACK for packet %p\n", p); | ||
| 1267 | |||
| 1268 | /* | ||
| 1269 | * It is possible that the packet has been transmitted, but the state | ||
| 1270 | * has not been updated from "transmitting" to "transmitted" yet. | ||
| 1271 | * In that case, we need to wait for this transition to occur in order | ||
| 1272 | * to determine between success or failure. | ||
| 1273 | * | ||
| 1274 | * On transmission failure, the packet will be locked after this call. | ||
| 1275 | * On success, the transmitted bit will be set. | ||
| 1276 | */ | ||
| 1277 | ssh_ptl_wait_until_transmitted(p); | ||
| 1278 | |||
| 1279 | /* | ||
| 1280 | * The packet will already be locked in case of a transmission error or | ||
| 1281 | * cancellation. Let the transmitter or cancellation issuer complete the | ||
| 1282 | * packet. | ||
| 1283 | */ | ||
| 1284 | if (unlikely(test_and_set_bit(SSH_PACKET_SF_LOCKED_BIT, &p->state))) { | ||
| 1285 | if (unlikely(!test_bit(SSH_PACKET_SF_TRANSMITTED_BIT, &p->state))) | ||
| 1286 | ptl_err(ptl, "ptl: received ACK before packet had been fully transmitted\n"); | ||
| 1287 | |||
| 1288 | ssh_packet_put(p); | ||
| 1289 | return; | ||
| 1290 | } | ||
| 1291 | |||
| 1292 | ssh_ptl_remove_and_complete(p, 0); | ||
| 1293 | ssh_packet_put(p); | ||
| 1294 | |||
| 1295 | if (atomic_read(&ptl->pending.count) < SSH_PTL_MAX_PENDING) | ||
| 1296 | ssh_ptl_tx_wakeup_packet(ptl); | ||
| 1297 | } | ||
| 1298 | |||
| 1299 | /** | ||
| 1300 | * ssh_ptl_submit() - Submit a packet to the transport layer. | ||
| 1301 | * @ptl: The packet transport layer to submit the packet to. | ||
| 1302 | * @p: The packet to submit. | ||
| 1303 | * | ||
| 1304 | * Submits a new packet to the transport layer, queuing it to be sent. This | ||
| 1305 | * function should not be used for re-submission. | ||
| 1306 | * | ||
| 1307 | * Return: Returns zero on success, %-EINVAL if a packet field is invalid or | ||
| 1308 | * the packet has been canceled prior to submission, %-EALREADY if the packet | ||
| 1309 | * has already been submitted, or %-ESHUTDOWN if the packet transport layer | ||
| 1310 | * has been shut down. | ||
| 1311 | */ | ||
| 1312 | int ssh_ptl_submit(struct ssh_ptl *ptl, struct ssh_packet *p) | ||
| 1313 | { | ||
| 1314 | struct ssh_ptl *ptl_old; | ||
| 1315 | int status; | ||
| 1316 | |||
| 1317 | trace_ssam_packet_submit(p); | ||
| 1318 | |||
| 1319 | /* Validate packet fields. */ | ||
| 1320 | if (test_bit(SSH_PACKET_TY_FLUSH_BIT, &p->state)) { | ||
| 1321 | if (p->data.ptr || test_bit(SSH_PACKET_TY_SEQUENCED_BIT, &p->state)) | ||
| 1322 | return -EINVAL; | ||
| 1323 | } else if (!p->data.ptr) { | ||
| 1324 | return -EINVAL; | ||
| 1325 | } | ||
| 1326 | |||
| 1327 | /* | ||
| 1328 | * The ptl reference only gets set on or before the first submission. | ||
| 1329 | * After the first submission, it has to be read-only. | ||
| 1330 | * | ||
| 1331 | * Note that ptl may already be set from upper-layer request | ||
| 1332 | * submission, thus we cannot expect it to be NULL. | ||
| 1333 | */ | ||
| 1334 | ptl_old = READ_ONCE(p->ptl); | ||
| 1335 | if (!ptl_old) | ||
| 1336 | WRITE_ONCE(p->ptl, ptl); | ||
| 1337 | else if (WARN_ON(ptl_old != ptl)) | ||
| 1338 | return -EALREADY; /* Submitted on different PTL. */ | ||
| 1339 | |||
| 1340 | status = ssh_ptl_queue_push(p); | ||
| 1341 | if (status) | ||
| 1342 | return status; | ||
| 1343 | |||
| 1344 | if (!test_bit(SSH_PACKET_TY_BLOCKING_BIT, &p->state) || | ||
| 1345 | (atomic_read(&ptl->pending.count) < SSH_PTL_MAX_PENDING)) | ||
| 1346 | ssh_ptl_tx_wakeup_packet(ptl); | ||
| 1347 | |||
| 1348 | return 0; | ||
| 1349 | } | ||
| 1350 | |||
| 1351 | /* | ||
| 1352 | * __ssh_ptl_resubmit() - Re-submit a packet to the transport layer. | ||
| 1353 | * @packet: The packet to re-submit. | ||
| 1354 | * | ||
| 1355 | * Re-submits the given packet: Checks if it can be re-submitted and queues it | ||
| 1356 | * if it can, resetting the packet timestamp in the process. Must be called | ||
| 1357 | * with the pending lock held. | ||
| 1358 | * | ||
| 1359 | * Return: Returns %-ECANCELED if the packet has exceeded its number of tries, | ||
| 1360 | * %-EINVAL if the packet has been locked, %-EALREADY if the packet is already | ||
| 1361 | * on the queue, and %-ESHUTDOWN if the transmission layer has been shut down. | ||
| 1362 | */ | ||
| 1363 | static int __ssh_ptl_resubmit(struct ssh_packet *packet) | ||
| 1364 | { | ||
| 1365 | int status; | ||
| 1366 | u8 try; | ||
| 1367 | |||
| 1368 | lockdep_assert_held(&packet->ptl->pending.lock); | ||
| 1369 | |||
| 1370 | trace_ssam_packet_resubmit(packet); | ||
| 1371 | |||
| 1372 | spin_lock(&packet->ptl->queue.lock); | ||
| 1373 | |||
| 1374 | /* Check if the packet is out of tries. */ | ||
| 1375 | try = ssh_packet_priority_get_try(packet->priority); | ||
| 1376 | if (try >= SSH_PTL_MAX_PACKET_TRIES) { | ||
| 1377 | spin_unlock(&packet->ptl->queue.lock); | ||
| 1378 | return -ECANCELED; | ||
| 1379 | } | ||
| 1380 | |||
| 1381 | status = __ssh_ptl_queue_push(packet); | ||
| 1382 | if (status) { | ||
| 1383 | /* | ||
| 1384 | * An error here indicates that the packet has either already | ||
| 1385 | * been queued, been locked, or the transport layer is being | ||
| 1386 | * shut down. In all cases: Ignore the error. | ||
| 1387 | */ | ||
| 1388 | spin_unlock(&packet->ptl->queue.lock); | ||
| 1389 | return status; | ||
| 1390 | } | ||
| 1391 | |||
| 1392 | packet->timestamp = KTIME_MAX; | ||
| 1393 | |||
| 1394 | spin_unlock(&packet->ptl->queue.lock); | ||
| 1395 | return 0; | ||
| 1396 | } | ||
| 1397 | |||
| 1398 | static void ssh_ptl_resubmit_pending(struct ssh_ptl *ptl) | ||
| 1399 | { | ||
| 1400 | struct ssh_packet *p; | ||
| 1401 | bool resub = false; | ||
| 1402 | |||
| 1403 | /* | ||
| 1404 | * Note: We deliberately do not remove/attempt to cancel and complete | ||
| 1405 | * packets that are out of tires in this function. The packet will be | ||
| 1406 | * eventually canceled and completed by the timeout. Removing the packet | ||
| 1407 | * here could lead to overly eager cancellation if the packet has not | ||
| 1408 | * been re-transmitted yet but the tries-counter already updated (i.e | ||
| 1409 | * ssh_ptl_tx_next() removed the packet from the queue and updated the | ||
| 1410 | * counter, but re-transmission for the last try has not actually | ||
| 1411 | * started yet). | ||
| 1412 | */ | ||
| 1413 | |||
| 1414 | spin_lock(&ptl->pending.lock); | ||
| 1415 | |||
| 1416 | /* Re-queue all pending packets. */ | ||
| 1417 | list_for_each_entry(p, &ptl->pending.head, pending_node) { | ||
| 1418 | /* | ||
| 1419 | * Re-submission fails if the packet is out of tries, has been | ||
| 1420 | * locked, is already queued, or the layer is being shut down. | ||
| 1421 | * No need to re-schedule tx-thread in those cases. | ||
| 1422 | */ | ||
| 1423 | if (!__ssh_ptl_resubmit(p)) | ||
| 1424 | resub = true; | ||
| 1425 | } | ||
| 1426 | |||
| 1427 | spin_unlock(&ptl->pending.lock); | ||
| 1428 | |||
| 1429 | if (resub) | ||
| 1430 | ssh_ptl_tx_wakeup_packet(ptl); | ||
| 1431 | } | ||
| 1432 | |||
| 1433 | /** | ||
| 1434 | * ssh_ptl_cancel() - Cancel a packet. | ||
| 1435 | * @p: The packet to cancel. | ||
| 1436 | * | ||
| 1437 | * Cancels a packet. There are no guarantees on when completion and release | ||
| 1438 | * callbacks will be called. This may occur during execution of this function | ||
| 1439 | * or may occur at any point later. | ||
| 1440 | * | ||
| 1441 | * Note that it is not guaranteed that the packet will actually be canceled if | ||
| 1442 | * the packet is concurrently completed by another process. The only guarantee | ||
| 1443 | * of this function is that the packet will be completed (with success, | ||
| 1444 | * failure, or cancellation) and released from the transport layer in a | ||
| 1445 | * reasonable time-frame. | ||
| 1446 | * | ||
| 1447 | * May be called before the packet has been submitted, in which case any later | ||
| 1448 | * packet submission fails. | ||
| 1449 | */ | ||
| 1450 | void ssh_ptl_cancel(struct ssh_packet *p) | ||
| 1451 | { | ||
| 1452 | if (test_and_set_bit(SSH_PACKET_SF_CANCELED_BIT, &p->state)) | ||
| 1453 | return; | ||
| 1454 | |||
| 1455 | trace_ssam_packet_cancel(p); | ||
| 1456 | |||
| 1457 | /* | ||
| 1458 | * Lock packet and commit with memory barrier. If this packet has | ||
| 1459 | * already been locked, it's going to be removed and completed by | ||
| 1460 | * another party, which should have precedence. | ||
| 1461 | */ | ||
| 1462 | if (test_and_set_bit(SSH_PACKET_SF_LOCKED_BIT, &p->state)) | ||
| 1463 | return; | ||
| 1464 | |||
| 1465 | /* | ||
| 1466 | * By marking the packet as locked and employing the implicit memory | ||
| 1467 | * barrier of test_and_set_bit, we have guaranteed that, at this point, | ||
| 1468 | * the packet cannot be added to the queue any more. | ||
| 1469 | * | ||
| 1470 | * In case the packet has never been submitted, packet->ptl is NULL. If | ||
| 1471 | * the packet is currently being submitted, packet->ptl may be NULL or | ||
| 1472 | * non-NULL. Due marking the packet as locked above and committing with | ||
| 1473 | * the memory barrier, we have guaranteed that, if packet->ptl is NULL, | ||
| 1474 | * the packet will never be added to the queue. If packet->ptl is | ||
| 1475 | * non-NULL, we don't have any guarantees. | ||
| 1476 | */ | ||
| 1477 | |||
| 1478 | if (READ_ONCE(p->ptl)) { | ||
| 1479 | ssh_ptl_remove_and_complete(p, -ECANCELED); | ||
| 1480 | |||
| 1481 | if (atomic_read(&p->ptl->pending.count) < SSH_PTL_MAX_PENDING) | ||
| 1482 | ssh_ptl_tx_wakeup_packet(p->ptl); | ||
| 1483 | |||
| 1484 | } else if (!test_and_set_bit(SSH_PACKET_SF_COMPLETED_BIT, &p->state)) { | ||
| 1485 | __ssh_ptl_complete(p, -ECANCELED); | ||
| 1486 | } | ||
| 1487 | } | ||
| 1488 | |||
| 1489 | /* Must be called with pending lock held */ | ||
| 1490 | static ktime_t ssh_packet_get_expiration(struct ssh_packet *p, ktime_t timeout) | ||
| 1491 | { | ||
| 1492 | lockdep_assert_held(&p->ptl->pending.lock); | ||
| 1493 | |||
| 1494 | if (p->timestamp != KTIME_MAX) | ||
| 1495 | return ktime_add(p->timestamp, timeout); | ||
| 1496 | else | ||
| 1497 | return KTIME_MAX; | ||
| 1498 | } | ||
| 1499 | |||
| 1500 | static void ssh_ptl_timeout_reap(struct work_struct *work) | ||
| 1501 | { | ||
| 1502 | struct ssh_ptl *ptl = to_ssh_ptl(work, rtx_timeout.reaper.work); | ||
| 1503 | struct ssh_packet *p, *n; | ||
| 1504 | LIST_HEAD(claimed); | ||
| 1505 | ktime_t now = ktime_get_coarse_boottime(); | ||
| 1506 | ktime_t timeout = ptl->rtx_timeout.timeout; | ||
| 1507 | ktime_t next = KTIME_MAX; | ||
| 1508 | bool resub = false; | ||
| 1509 | int status; | ||
| 1510 | |||
| 1511 | trace_ssam_ptl_timeout_reap(atomic_read(&ptl->pending.count)); | ||
| 1512 | |||
| 1513 | /* | ||
| 1514 | * Mark reaper as "not pending". This is done before checking any | ||
| 1515 | * packets to avoid lost-update type problems. | ||
| 1516 | */ | ||
| 1517 | spin_lock(&ptl->rtx_timeout.lock); | ||
| 1518 | ptl->rtx_timeout.expires = KTIME_MAX; | ||
| 1519 | spin_unlock(&ptl->rtx_timeout.lock); | ||
| 1520 | |||
| 1521 | spin_lock(&ptl->pending.lock); | ||
| 1522 | |||
| 1523 | list_for_each_entry_safe(p, n, &ptl->pending.head, pending_node) { | ||
| 1524 | ktime_t expires = ssh_packet_get_expiration(p, timeout); | ||
| 1525 | |||
| 1526 | /* | ||
| 1527 | * Check if the timeout hasn't expired yet. Find out next | ||
| 1528 | * expiration date to be handled after this run. | ||
| 1529 | */ | ||
| 1530 | if (ktime_after(expires, now)) { | ||
| 1531 | next = ktime_before(expires, next) ? expires : next; | ||
| 1532 | continue; | ||
| 1533 | } | ||
| 1534 | |||
| 1535 | trace_ssam_packet_timeout(p); | ||
| 1536 | |||
| 1537 | status = __ssh_ptl_resubmit(p); | ||
| 1538 | |||
| 1539 | /* | ||
| 1540 | * Re-submission fails if the packet is out of tries, has been | ||
| 1541 | * locked, is already queued, or the layer is being shut down. | ||
| 1542 | * No need to re-schedule tx-thread in those cases. | ||
| 1543 | */ | ||
| 1544 | if (!status) | ||
| 1545 | resub = true; | ||
| 1546 | |||
| 1547 | /* Go to next packet if this packet is not out of tries. */ | ||
| 1548 | if (status != -ECANCELED) | ||
| 1549 | continue; | ||
| 1550 | |||
| 1551 | /* No more tries left: Cancel the packet. */ | ||
| 1552 | |||
| 1553 | /* | ||
| 1554 | * If someone else has locked the packet already, don't use it | ||
| 1555 | * and let the other party complete it. | ||
| 1556 | */ | ||
| 1557 | if (test_and_set_bit(SSH_PACKET_SF_LOCKED_BIT, &p->state)) | ||
| 1558 | continue; | ||
| 1559 | |||
| 1560 | /* | ||
| 1561 | * We have now marked the packet as locked. Thus it cannot be | ||
| 1562 | * added to the pending list again after we've removed it here. | ||
| 1563 | * We can therefore re-use the pending_node of this packet | ||
| 1564 | * temporarily. | ||
| 1565 | */ | ||
| 1566 | |||
| 1567 | clear_bit(SSH_PACKET_SF_PENDING_BIT, &p->state); | ||
| 1568 | |||
| 1569 | atomic_dec(&ptl->pending.count); | ||
| 1570 | list_del(&p->pending_node); | ||
| 1571 | |||
| 1572 | list_add_tail(&p->pending_node, &claimed); | ||
| 1573 | } | ||
| 1574 | |||
| 1575 | spin_unlock(&ptl->pending.lock); | ||
| 1576 | |||
| 1577 | /* Cancel and complete the packet. */ | ||
| 1578 | list_for_each_entry_safe(p, n, &claimed, pending_node) { | ||
| 1579 | if (!test_and_set_bit(SSH_PACKET_SF_COMPLETED_BIT, &p->state)) { | ||
| 1580 | ssh_ptl_queue_remove(p); | ||
| 1581 | __ssh_ptl_complete(p, -ETIMEDOUT); | ||
| 1582 | } | ||
| 1583 | |||
| 1584 | /* | ||
| 1585 | * Drop the reference we've obtained by removing it from | ||
| 1586 | * the pending set. | ||
| 1587 | */ | ||
| 1588 | list_del(&p->pending_node); | ||
| 1589 | ssh_packet_put(p); | ||
| 1590 | } | ||
| 1591 | |||
| 1592 | /* Ensure that reaper doesn't run again immediately. */ | ||
| 1593 | next = max(next, ktime_add(now, SSH_PTL_PACKET_TIMEOUT_RESOLUTION)); | ||
| 1594 | if (next != KTIME_MAX) | ||
| 1595 | ssh_ptl_timeout_reaper_mod(ptl, now, next); | ||
| 1596 | |||
| 1597 | if (resub) | ||
| 1598 | ssh_ptl_tx_wakeup_packet(ptl); | ||
| 1599 | } | ||
| 1600 | |||
| 1601 | static bool ssh_ptl_rx_retransmit_check(struct ssh_ptl *ptl, u8 seq) | ||
| 1602 | { | ||
| 1603 | int i; | ||
| 1604 | |||
| 1605 | /* | ||
| 1606 | * Check if SEQ has been seen recently (i.e. packet was | ||
| 1607 | * re-transmitted and we should ignore it). | ||
| 1608 | */ | ||
| 1609 | for (i = 0; i < ARRAY_SIZE(ptl->rx.blocked.seqs); i++) { | ||
| 1610 | if (likely(ptl->rx.blocked.seqs[i] != seq)) | ||
| 1611 | continue; | ||
| 1612 | |||
| 1613 | ptl_dbg(ptl, "ptl: ignoring repeated data packet\n"); | ||
| 1614 | return true; | ||
| 1615 | } | ||
| 1616 | |||
| 1617 | /* Update list of blocked sequence IDs. */ | ||
| 1618 | ptl->rx.blocked.seqs[ptl->rx.blocked.offset] = seq; | ||
| 1619 | ptl->rx.blocked.offset = (ptl->rx.blocked.offset + 1) | ||
| 1620 | % ARRAY_SIZE(ptl->rx.blocked.seqs); | ||
| 1621 | |||
| 1622 | return false; | ||
| 1623 | } | ||
| 1624 | |||
| 1625 | static void ssh_ptl_rx_dataframe(struct ssh_ptl *ptl, | ||
| 1626 | const struct ssh_frame *frame, | ||
| 1627 | const struct ssam_span *payload) | ||
| 1628 | { | ||
| 1629 | if (ssh_ptl_rx_retransmit_check(ptl, frame->seq)) | ||
| 1630 | return; | ||
| 1631 | |||
| 1632 | ptl->ops.data_received(ptl, payload); | ||
| 1633 | } | ||
| 1634 | |||
| 1635 | static void ssh_ptl_send_ack(struct ssh_ptl *ptl, u8 seq) | ||
| 1636 | { | ||
| 1637 | struct ssh_packet *packet; | ||
| 1638 | struct ssam_span buf; | ||
| 1639 | struct msgbuf msgb; | ||
| 1640 | int status; | ||
| 1641 | |||
| 1642 | status = ssh_ctrl_packet_alloc(&packet, &buf, GFP_KERNEL); | ||
| 1643 | if (status) { | ||
| 1644 | ptl_err(ptl, "ptl: failed to allocate ACK packet\n"); | ||
| 1645 | return; | ||
| 1646 | } | ||
| 1647 | |||
| 1648 | ssh_packet_init(packet, 0, SSH_PACKET_PRIORITY(ACK, 0), | ||
| 1649 | &ssh_ptl_ctrl_packet_ops); | ||
| 1650 | |||
| 1651 | msgb_init(&msgb, buf.ptr, buf.len); | ||
| 1652 | msgb_push_ack(&msgb, seq); | ||
| 1653 | ssh_packet_set_data(packet, msgb.begin, msgb_bytes_used(&msgb)); | ||
| 1654 | |||
| 1655 | ssh_ptl_submit(ptl, packet); | ||
| 1656 | ssh_packet_put(packet); | ||
| 1657 | } | ||
| 1658 | |||
| 1659 | static void ssh_ptl_send_nak(struct ssh_ptl *ptl) | ||
| 1660 | { | ||
| 1661 | struct ssh_packet *packet; | ||
| 1662 | struct ssam_span buf; | ||
| 1663 | struct msgbuf msgb; | ||
| 1664 | int status; | ||
| 1665 | |||
| 1666 | status = ssh_ctrl_packet_alloc(&packet, &buf, GFP_KERNEL); | ||
| 1667 | if (status) { | ||
| 1668 | ptl_err(ptl, "ptl: failed to allocate NAK packet\n"); | ||
| 1669 | return; | ||
| 1670 | } | ||
| 1671 | |||
| 1672 | ssh_packet_init(packet, 0, SSH_PACKET_PRIORITY(NAK, 0), | ||
| 1673 | &ssh_ptl_ctrl_packet_ops); | ||
| 1674 | |||
| 1675 | msgb_init(&msgb, buf.ptr, buf.len); | ||
| 1676 | msgb_push_nak(&msgb); | ||
| 1677 | ssh_packet_set_data(packet, msgb.begin, msgb_bytes_used(&msgb)); | ||
| 1678 | |||
| 1679 | ssh_ptl_submit(ptl, packet); | ||
| 1680 | ssh_packet_put(packet); | ||
| 1681 | } | ||
| 1682 | |||
| 1683 | static size_t ssh_ptl_rx_eval(struct ssh_ptl *ptl, struct ssam_span *source) | ||
| 1684 | { | ||
| 1685 | struct ssh_frame *frame; | ||
| 1686 | struct ssam_span payload; | ||
| 1687 | struct ssam_span aligned; | ||
| 1688 | bool syn_found; | ||
| 1689 | int status; | ||
| 1690 | |||
| 1691 | /* Error injection: Modify data to simulate corrupt SYN bytes. */ | ||
| 1692 | ssh_ptl_rx_inject_invalid_syn(ptl, source); | ||
| 1693 | |||
| 1694 | /* Find SYN. */ | ||
| 1695 | syn_found = sshp_find_syn(source, &aligned); | ||
| 1696 | |||
| 1697 | if (unlikely(aligned.ptr != source->ptr)) { | ||
| 1698 | /* | ||
| 1699 | * We expect aligned.ptr == source->ptr. If this is not the | ||
| 1700 | * case, then aligned.ptr > source->ptr and we've encountered | ||
| 1701 | * some unexpected data where we'd expect the start of a new | ||
| 1702 | * message (i.e. the SYN sequence). | ||
| 1703 | * | ||
| 1704 | * This can happen when a CRC check for the previous message | ||
| 1705 | * failed and we start actively searching for the next one | ||
| 1706 | * (via the call to sshp_find_syn() above), or the first bytes | ||
| 1707 | * of a message got dropped or corrupted. | ||
| 1708 | * | ||
| 1709 | * In any case, we issue a warning, send a NAK to the EC to | ||
| 1710 | * request re-transmission of any data we haven't acknowledged | ||
| 1711 | * yet, and finally, skip everything up to the next SYN | ||
| 1712 | * sequence. | ||
| 1713 | */ | ||
| 1714 | |||
| 1715 | ptl_warn(ptl, "rx: parser: invalid start of frame, skipping\n"); | ||
| 1716 | |||
| 1717 | /* | ||
| 1718 | * Notes: | ||
| 1719 | * - This might send multiple NAKs in case the communication | ||
| 1720 | * starts with an invalid SYN and is broken down into multiple | ||
| 1721 | * pieces. This should generally be handled fine, we just | ||
| 1722 | * might receive duplicate data in this case, which is | ||
| 1723 | * detected when handling data frames. | ||
| 1724 | * - This path will also be executed on invalid CRCs: When an | ||
| 1725 | * invalid CRC is encountered, the code below will skip data | ||
| 1726 | * until directly after the SYN. This causes the search for | ||
| 1727 | * the next SYN, which is generally not placed directly after | ||
| 1728 | * the last one. | ||
| 1729 | * | ||
| 1730 | * Open question: Should we send this in case of invalid | ||
| 1731 | * payload CRCs if the frame-type is non-sequential (current | ||
| 1732 | * implementation) or should we drop that frame without | ||
| 1733 | * telling the EC? | ||
| 1734 | */ | ||
| 1735 | ssh_ptl_send_nak(ptl); | ||
| 1736 | } | ||
| 1737 | |||
| 1738 | if (unlikely(!syn_found)) | ||
| 1739 | return aligned.ptr - source->ptr; | ||
| 1740 | |||
| 1741 | /* Error injection: Modify data to simulate corruption. */ | ||
| 1742 | ssh_ptl_rx_inject_invalid_data(ptl, &aligned); | ||
| 1743 | |||
| 1744 | /* Parse and validate frame. */ | ||
| 1745 | status = sshp_parse_frame(&ptl->serdev->dev, &aligned, &frame, &payload, | ||
| 1746 | SSH_PTL_RX_BUF_LEN); | ||
| 1747 | if (status) /* Invalid frame: skip to next SYN. */ | ||
| 1748 | return aligned.ptr - source->ptr + sizeof(u16); | ||
| 1749 | if (!frame) /* Not enough data. */ | ||
| 1750 | return aligned.ptr - source->ptr; | ||
| 1751 | |||
| 1752 | trace_ssam_rx_frame_received(frame); | ||
| 1753 | |||
| 1754 | switch (frame->type) { | ||
| 1755 | case SSH_FRAME_TYPE_ACK: | ||
| 1756 | ssh_ptl_acknowledge(ptl, frame->seq); | ||
| 1757 | break; | ||
| 1758 | |||
| 1759 | case SSH_FRAME_TYPE_NAK: | ||
| 1760 | ssh_ptl_resubmit_pending(ptl); | ||
| 1761 | break; | ||
| 1762 | |||
| 1763 | case SSH_FRAME_TYPE_DATA_SEQ: | ||
| 1764 | ssh_ptl_send_ack(ptl, frame->seq); | ||
| 1765 | fallthrough; | ||
| 1766 | |||
| 1767 | case SSH_FRAME_TYPE_DATA_NSQ: | ||
| 1768 | ssh_ptl_rx_dataframe(ptl, frame, &payload); | ||
| 1769 | break; | ||
| 1770 | |||
| 1771 | default: | ||
| 1772 | ptl_warn(ptl, "ptl: received frame with unknown type %#04x\n", | ||
| 1773 | frame->type); | ||
| 1774 | break; | ||
| 1775 | } | ||
| 1776 | |||
| 1777 | return aligned.ptr - source->ptr + SSH_MESSAGE_LENGTH(payload.len); | ||
| 1778 | } | ||
| 1779 | |||
| 1780 | static int ssh_ptl_rx_threadfn(void *data) | ||
| 1781 | { | ||
| 1782 | struct ssh_ptl *ptl = data; | ||
| 1783 | |||
| 1784 | while (true) { | ||
| 1785 | struct ssam_span span; | ||
| 1786 | size_t offs = 0; | ||
| 1787 | size_t n; | ||
| 1788 | |||
| 1789 | wait_event_interruptible(ptl->rx.wq, | ||
| 1790 | !kfifo_is_empty(&ptl->rx.fifo) || | ||
| 1791 | kthread_should_stop()); | ||
| 1792 | if (kthread_should_stop()) | ||
| 1793 | break; | ||
| 1794 | |||
| 1795 | /* Copy from fifo to evaluation buffer. */ | ||
| 1796 | n = sshp_buf_read_from_fifo(&ptl->rx.buf, &ptl->rx.fifo); | ||
| 1797 | |||
| 1798 | ptl_dbg(ptl, "rx: received data (size: %zu)\n", n); | ||
| 1799 | print_hex_dump_debug("rx: ", DUMP_PREFIX_OFFSET, 16, 1, | ||
| 1800 | ptl->rx.buf.ptr + ptl->rx.buf.len - n, | ||
| 1801 | n, false); | ||
| 1802 | |||
| 1803 | /* Parse until we need more bytes or buffer is empty. */ | ||
| 1804 | while (offs < ptl->rx.buf.len) { | ||
| 1805 | sshp_buf_span_from(&ptl->rx.buf, offs, &span); | ||
| 1806 | n = ssh_ptl_rx_eval(ptl, &span); | ||
| 1807 | if (n == 0) | ||
| 1808 | break; /* Need more bytes. */ | ||
| 1809 | |||
| 1810 | offs += n; | ||
| 1811 | } | ||
| 1812 | |||
| 1813 | /* Throw away the evaluated parts. */ | ||
| 1814 | sshp_buf_drop(&ptl->rx.buf, offs); | ||
| 1815 | } | ||
| 1816 | |||
| 1817 | return 0; | ||
| 1818 | } | ||
| 1819 | |||
| 1820 | static void ssh_ptl_rx_wakeup(struct ssh_ptl *ptl) | ||
| 1821 | { | ||
| 1822 | wake_up(&ptl->rx.wq); | ||
| 1823 | } | ||
| 1824 | |||
| 1825 | /** | ||
| 1826 | * ssh_ptl_rx_start() - Start packet transport layer receiver thread. | ||
| 1827 | * @ptl: The packet transport layer. | ||
| 1828 | * | ||
| 1829 | * Return: Returns zero on success, a negative error code on failure. | ||
| 1830 | */ | ||
| 1831 | int ssh_ptl_rx_start(struct ssh_ptl *ptl) | ||
| 1832 | { | ||
| 1833 | if (ptl->rx.thread) | ||
| 1834 | return 0; | ||
| 1835 | |||
| 1836 | ptl->rx.thread = kthread_run(ssh_ptl_rx_threadfn, ptl, | ||
| 1837 | "ssam_serial_hub-rx"); | ||
| 1838 | if (IS_ERR(ptl->rx.thread)) | ||
| 1839 | return PTR_ERR(ptl->rx.thread); | ||
| 1840 | |||
| 1841 | return 0; | ||
| 1842 | } | ||
| 1843 | |||
| 1844 | /** | ||
| 1845 | * ssh_ptl_rx_stop() - Stop packet transport layer receiver thread. | ||
| 1846 | * @ptl: The packet transport layer. | ||
| 1847 | * | ||
| 1848 | * Return: Returns zero on success, a negative error code on failure. | ||
| 1849 | */ | ||
| 1850 | int ssh_ptl_rx_stop(struct ssh_ptl *ptl) | ||
| 1851 | { | ||
| 1852 | int status = 0; | ||
| 1853 | |||
| 1854 | if (ptl->rx.thread) { | ||
| 1855 | status = kthread_stop(ptl->rx.thread); | ||
| 1856 | ptl->rx.thread = NULL; | ||
| 1857 | } | ||
| 1858 | |||
| 1859 | return status; | ||
| 1860 | } | ||
| 1861 | |||
| 1862 | /** | ||
| 1863 | * ssh_ptl_rx_rcvbuf() - Push data from lower-layer transport to the packet | ||
| 1864 | * layer. | ||
| 1865 | * @ptl: The packet transport layer. | ||
| 1866 | * @buf: Pointer to the data to push to the layer. | ||
| 1867 | * @n: Size of the data to push to the layer, in bytes. | ||
| 1868 | * | ||
| 1869 | * Pushes data from a lower-layer transport to the receiver fifo buffer of the | ||
| 1870 | * packet layer and notifies the receiver thread. Calls to this function are | ||
| 1871 | * ignored once the packet layer has been shut down. | ||
| 1872 | * | ||
| 1873 | * Return: Returns the number of bytes transferred (positive or zero) on | ||
| 1874 | * success. Returns %-ESHUTDOWN if the packet layer has been shut down. | ||
| 1875 | */ | ||
| 1876 | int ssh_ptl_rx_rcvbuf(struct ssh_ptl *ptl, const u8 *buf, size_t n) | ||
| 1877 | { | ||
| 1878 | int used; | ||
| 1879 | |||
| 1880 | if (test_bit(SSH_PTL_SF_SHUTDOWN_BIT, &ptl->state)) | ||
| 1881 | return -ESHUTDOWN; | ||
| 1882 | |||
| 1883 | used = kfifo_in(&ptl->rx.fifo, buf, n); | ||
| 1884 | if (used) | ||
| 1885 | ssh_ptl_rx_wakeup(ptl); | ||
| 1886 | |||
| 1887 | return used; | ||
| 1888 | } | ||
| 1889 | |||
| 1890 | /** | ||
| 1891 | * ssh_ptl_shutdown() - Shut down the packet transport layer. | ||
| 1892 | * @ptl: The packet transport layer. | ||
| 1893 | * | ||
| 1894 | * Shuts down the packet transport layer, removing and canceling all queued | ||
| 1895 | * and pending packets. Packets canceled by this operation will be completed | ||
| 1896 | * with %-ESHUTDOWN as status. Receiver and transmitter threads will be | ||
| 1897 | * stopped. | ||
| 1898 | * | ||
| 1899 | * As a result of this function, the transport layer will be marked as shut | ||
| 1900 | * down. Submission of packets after the transport layer has been shut down | ||
| 1901 | * will fail with %-ESHUTDOWN. | ||
| 1902 | */ | ||
| 1903 | void ssh_ptl_shutdown(struct ssh_ptl *ptl) | ||
| 1904 | { | ||
| 1905 | LIST_HEAD(complete_q); | ||
| 1906 | LIST_HEAD(complete_p); | ||
| 1907 | struct ssh_packet *p, *n; | ||
| 1908 | int status; | ||
| 1909 | |||
| 1910 | /* Ensure that no new packets (including ACK/NAK) can be submitted. */ | ||
| 1911 | set_bit(SSH_PTL_SF_SHUTDOWN_BIT, &ptl->state); | ||
| 1912 | /* | ||
| 1913 | * Ensure that the layer gets marked as shut-down before actually | ||
| 1914 | * stopping it. In combination with the check in ssh_ptl_queue_push(), | ||
| 1915 | * this guarantees that no new packets can be added and all already | ||
| 1916 | * queued packets are properly canceled. In combination with the check | ||
| 1917 | * in ssh_ptl_rx_rcvbuf(), this guarantees that received data is | ||
| 1918 | * properly cut off. | ||
| 1919 | */ | ||
| 1920 | smp_mb__after_atomic(); | ||
| 1921 | |||
| 1922 | status = ssh_ptl_rx_stop(ptl); | ||
| 1923 | if (status) | ||
| 1924 | ptl_err(ptl, "ptl: failed to stop receiver thread\n"); | ||
| 1925 | |||
| 1926 | status = ssh_ptl_tx_stop(ptl); | ||
| 1927 | if (status) | ||
| 1928 | ptl_err(ptl, "ptl: failed to stop transmitter thread\n"); | ||
| 1929 | |||
| 1930 | cancel_delayed_work_sync(&ptl->rtx_timeout.reaper); | ||
| 1931 | |||
| 1932 | /* | ||
| 1933 | * At this point, all threads have been stopped. This means that the | ||
| 1934 | * only references to packets from inside the system are in the queue | ||
| 1935 | * and pending set. | ||
| 1936 | * | ||
| 1937 | * Note: We still need locks here because someone could still be | ||
| 1938 | * canceling packets. | ||
| 1939 | * | ||
| 1940 | * Note 2: We can re-use queue_node (or pending_node) if we mark the | ||
| 1941 | * packet as locked an then remove it from the queue (or pending set | ||
| 1942 | * respectively). Marking the packet as locked avoids re-queuing | ||
| 1943 | * (which should already be prevented by having stopped the treads...) | ||
| 1944 | * and not setting QUEUED_BIT (or PENDING_BIT) prevents removal from a | ||
| 1945 | * new list via other threads (e.g. cancellation). | ||
| 1946 | * | ||
| 1947 | * Note 3: There may be overlap between complete_p and complete_q. | ||
| 1948 | * This is handled via test_and_set_bit() on the "completed" flag | ||
| 1949 | * (also handles cancellation). | ||
| 1950 | */ | ||
| 1951 | |||
| 1952 | /* Mark queued packets as locked and move them to complete_q. */ | ||
| 1953 | spin_lock(&ptl->queue.lock); | ||
| 1954 | list_for_each_entry_safe(p, n, &ptl->queue.head, queue_node) { | ||
| 1955 | set_bit(SSH_PACKET_SF_LOCKED_BIT, &p->state); | ||
| 1956 | /* Ensure that state does not get zero. */ | ||
| 1957 | smp_mb__before_atomic(); | ||
| 1958 | clear_bit(SSH_PACKET_SF_QUEUED_BIT, &p->state); | ||
| 1959 | |||
| 1960 | list_del(&p->queue_node); | ||
| 1961 | list_add_tail(&p->queue_node, &complete_q); | ||
| 1962 | } | ||
| 1963 | spin_unlock(&ptl->queue.lock); | ||
| 1964 | |||
| 1965 | /* Mark pending packets as locked and move them to complete_p. */ | ||
| 1966 | spin_lock(&ptl->pending.lock); | ||
| 1967 | list_for_each_entry_safe(p, n, &ptl->pending.head, pending_node) { | ||
| 1968 | set_bit(SSH_PACKET_SF_LOCKED_BIT, &p->state); | ||
| 1969 | /* Ensure that state does not get zero. */ | ||
| 1970 | smp_mb__before_atomic(); | ||
| 1971 | clear_bit(SSH_PACKET_SF_PENDING_BIT, &p->state); | ||
| 1972 | |||
| 1973 | list_del(&p->pending_node); | ||
| 1974 | list_add_tail(&p->pending_node, &complete_q); | ||
| 1975 | } | ||
| 1976 | atomic_set(&ptl->pending.count, 0); | ||
| 1977 | spin_unlock(&ptl->pending.lock); | ||
| 1978 | |||
| 1979 | /* Complete and drop packets on complete_q. */ | ||
| 1980 | list_for_each_entry(p, &complete_q, queue_node) { | ||
| 1981 | if (!test_and_set_bit(SSH_PACKET_SF_COMPLETED_BIT, &p->state)) | ||
| 1982 | __ssh_ptl_complete(p, -ESHUTDOWN); | ||
| 1983 | |||
| 1984 | ssh_packet_put(p); | ||
| 1985 | } | ||
| 1986 | |||
| 1987 | /* Complete and drop packets on complete_p. */ | ||
| 1988 | list_for_each_entry(p, &complete_p, pending_node) { | ||
| 1989 | if (!test_and_set_bit(SSH_PACKET_SF_COMPLETED_BIT, &p->state)) | ||
| 1990 | __ssh_ptl_complete(p, -ESHUTDOWN); | ||
| 1991 | |||
| 1992 | ssh_packet_put(p); | ||
| 1993 | } | ||
| 1994 | |||
| 1995 | /* | ||
| 1996 | * At this point we have guaranteed that the system doesn't reference | ||
| 1997 | * any packets any more. | ||
| 1998 | */ | ||
| 1999 | } | ||
| 2000 | |||
| 2001 | /** | ||
| 2002 | * ssh_ptl_init() - Initialize packet transport layer. | ||
| 2003 | * @ptl: The packet transport layer to initialize. | ||
| 2004 | * @serdev: The underlying serial device, i.e. the lower-level transport. | ||
| 2005 | * @ops: Packet layer operations. | ||
| 2006 | * | ||
| 2007 | * Initializes the given packet transport layer. Transmitter and receiver | ||
| 2008 | * threads must be started separately via ssh_ptl_tx_start() and | ||
| 2009 | * ssh_ptl_rx_start(), after the packet-layer has been initialized and the | ||
| 2010 | * lower-level transport layer has been set up. | ||
| 2011 | * | ||
| 2012 | * Return: Returns zero on success and a nonzero error code on failure. | ||
| 2013 | */ | ||
| 2014 | int ssh_ptl_init(struct ssh_ptl *ptl, struct serdev_device *serdev, | ||
| 2015 | struct ssh_ptl_ops *ops) | ||
| 2016 | { | ||
| 2017 | int i, status; | ||
| 2018 | |||
| 2019 | ptl->serdev = serdev; | ||
| 2020 | ptl->state = 0; | ||
| 2021 | |||
| 2022 | spin_lock_init(&ptl->queue.lock); | ||
| 2023 | INIT_LIST_HEAD(&ptl->queue.head); | ||
| 2024 | |||
| 2025 | spin_lock_init(&ptl->pending.lock); | ||
| 2026 | INIT_LIST_HEAD(&ptl->pending.head); | ||
| 2027 | atomic_set_release(&ptl->pending.count, 0); | ||
| 2028 | |||
| 2029 | ptl->tx.thread = NULL; | ||
| 2030 | atomic_set(&ptl->tx.running, 0); | ||
| 2031 | init_completion(&ptl->tx.thread_cplt_pkt); | ||
| 2032 | init_completion(&ptl->tx.thread_cplt_tx); | ||
| 2033 | init_waitqueue_head(&ptl->tx.packet_wq); | ||
| 2034 | |||
| 2035 | ptl->rx.thread = NULL; | ||
| 2036 | init_waitqueue_head(&ptl->rx.wq); | ||
| 2037 | |||
| 2038 | spin_lock_init(&ptl->rtx_timeout.lock); | ||
| 2039 | ptl->rtx_timeout.timeout = SSH_PTL_PACKET_TIMEOUT; | ||
| 2040 | ptl->rtx_timeout.expires = KTIME_MAX; | ||
| 2041 | INIT_DELAYED_WORK(&ptl->rtx_timeout.reaper, ssh_ptl_timeout_reap); | ||
| 2042 | |||
| 2043 | ptl->ops = *ops; | ||
| 2044 | |||
| 2045 | /* Initialize list of recent/blocked SEQs with invalid sequence IDs. */ | ||
| 2046 | for (i = 0; i < ARRAY_SIZE(ptl->rx.blocked.seqs); i++) | ||
| 2047 | ptl->rx.blocked.seqs[i] = U16_MAX; | ||
| 2048 | ptl->rx.blocked.offset = 0; | ||
| 2049 | |||
| 2050 | status = kfifo_alloc(&ptl->rx.fifo, SSH_PTL_RX_FIFO_LEN, GFP_KERNEL); | ||
| 2051 | if (status) | ||
| 2052 | return status; | ||
| 2053 | |||
| 2054 | status = sshp_buf_alloc(&ptl->rx.buf, SSH_PTL_RX_BUF_LEN, GFP_KERNEL); | ||
| 2055 | if (status) | ||
| 2056 | kfifo_free(&ptl->rx.fifo); | ||
| 2057 | |||
| 2058 | return status; | ||
| 2059 | } | ||
| 2060 | |||
| 2061 | /** | ||
| 2062 | * ssh_ptl_destroy() - Deinitialize packet transport layer. | ||
| 2063 | * @ptl: The packet transport layer to deinitialize. | ||
| 2064 | * | ||
| 2065 | * Deinitializes the given packet transport layer and frees resources | ||
| 2066 | * associated with it. If receiver and/or transmitter threads have been | ||
| 2067 | * started, the layer must first be shut down via ssh_ptl_shutdown() before | ||
| 2068 | * this function can be called. | ||
| 2069 | */ | ||
| 2070 | void ssh_ptl_destroy(struct ssh_ptl *ptl) | ||
| 2071 | { | ||
| 2072 | kfifo_free(&ptl->rx.fifo); | ||
| 2073 | sshp_buf_free(&ptl->rx.buf); | ||
| 2074 | } | ||
| @@ -0,0 +1,190 @@ | |||
| 1 | /* SPDX-License-Identifier: GPL-2.0+ */ | ||
| 2 | /* | ||
| 3 | * SSH packet transport layer. | ||
| 4 | * | ||
| 5 | * Copyright (C) 2019-2020 Maximilian Luz <luzmaximilian@gmail.com> | ||
| 6 | */ | ||
| 7 | |||
| 8 | #ifndef _SURFACE_AGGREGATOR_SSH_PACKET_LAYER_H | ||
| 9 | #define _SURFACE_AGGREGATOR_SSH_PACKET_LAYER_H | ||
| 10 | |||
| 11 | #include <linux/atomic.h> | ||
| 12 | #include <linux/kfifo.h> | ||
| 13 | #include <linux/ktime.h> | ||
| 14 | #include <linux/list.h> | ||
| 15 | #include <linux/serdev.h> | ||
| 16 | #include <linux/spinlock.h> | ||
| 17 | #include <linux/types.h> | ||
| 18 | #include <linux/wait.h> | ||
| 19 | #include <linux/workqueue.h> | ||
| 20 | |||
| 21 | #include <linux/surface_aggregator/serial_hub.h> | ||
| 22 | #include "ssh_parser.h" | ||
| 23 | |||
| 24 | /** | ||
| 25 | * enum ssh_ptl_state_flags - State-flags for &struct ssh_ptl. | ||
| 26 | * | ||
| 27 | * @SSH_PTL_SF_SHUTDOWN_BIT: | ||
| 28 | * Indicates that the packet transport layer has been shut down or is | ||
| 29 | * being shut down and should not accept any new packets/data. | ||
| 30 | */ | ||
| 31 | enum ssh_ptl_state_flags { | ||
| 32 | SSH_PTL_SF_SHUTDOWN_BIT, | ||
| 33 | }; | ||
| 34 | |||
| 35 | /** | ||
| 36 | * struct ssh_ptl_ops - Callback operations for packet transport layer. | ||
| 37 | * @data_received: Function called when a data-packet has been received. Both, | ||
| 38 | * the packet layer on which the packet has been received and | ||
| 39 | * the packet's payload data are provided to this function. | ||
| 40 | */ | ||
| 41 | struct ssh_ptl_ops { | ||
| 42 | void (*data_received)(struct ssh_ptl *p, const struct ssam_span *data); | ||
| 43 | }; | ||
| 44 | |||
| 45 | /** | ||
| 46 | * struct ssh_ptl - SSH packet transport layer. | ||
| 47 | * @serdev: Serial device providing the underlying data transport. | ||
| 48 | * @state: State(-flags) of the transport layer. | ||
| 49 | * @queue: Packet submission queue. | ||
| 50 | * @queue.lock: Lock for modifying the packet submission queue. | ||
| 51 | * @queue.head: List-head of the packet submission queue. | ||
| 52 | * @pending: Set/list of pending packets. | ||
| 53 | * @pending.lock: Lock for modifying the pending set. | ||
| 54 | * @pending.head: List-head of the pending set/list. | ||
| 55 | * @pending.count: Number of currently pending packets. | ||
| 56 | * @tx: Transmitter subsystem. | ||
| 57 | * @tx.running: Flag indicating (desired) transmitter thread state. | ||
| 58 | * @tx.thread: Transmitter thread. | ||
| 59 | * @tx.thread_cplt_tx: Completion for transmitter thread waiting on transfer. | ||
| 60 | * @tx.thread_cplt_pkt: Completion for transmitter thread waiting on packets. | ||
| 61 | * @tx.packet_wq: Waitqueue-head for packet transmit completion. | ||
| 62 | * @rx: Receiver subsystem. | ||
| 63 | * @rx.thread: Receiver thread. | ||
| 64 | * @rx.wq: Waitqueue-head for receiver thread. | ||
| 65 | * @rx.fifo: Buffer for receiving data/pushing data to receiver thread. | ||
| 66 | * @rx.buf: Buffer for evaluating data on receiver thread. | ||
| 67 | * @rx.blocked: List of recent/blocked sequence IDs to detect retransmission. | ||
| 68 | * @rx.blocked.seqs: Array of blocked sequence IDs. | ||
| 69 | * @rx.blocked.offset: Offset indicating where a new ID should be inserted. | ||
| 70 | * @rtx_timeout: Retransmission timeout subsystem. | ||
| 71 | * @rtx_timeout.lock: Lock for modifying the retransmission timeout reaper. | ||
| 72 | * @rtx_timeout.timeout: Timeout interval for retransmission. | ||
| 73 | * @rtx_timeout.expires: Time specifying when the reaper work is next scheduled. | ||
| 74 | * @rtx_timeout.reaper: Work performing timeout checks and subsequent actions. | ||
| 75 | * @ops: Packet layer operations. | ||
| 76 | */ | ||
| 77 | struct ssh_ptl { | ||
| 78 | struct serdev_device *serdev; | ||
| 79 | unsigned long state; | ||
| 80 | |||
| 81 | struct { | ||
| 82 | spinlock_t lock; | ||
| 83 | struct list_head head; | ||
| 84 | } queue; | ||
| 85 | |||
| 86 | struct { | ||
| 87 | spinlock_t lock; | ||
| 88 | struct list_head head; | ||
| 89 | atomic_t count; | ||
| 90 | } pending; | ||
| 91 | |||
| 92 | struct { | ||
| 93 | atomic_t running; | ||
| 94 | struct task_struct *thread; | ||
| 95 | struct completion thread_cplt_tx; | ||
| 96 | struct completion thread_cplt_pkt; | ||
| 97 | struct wait_queue_head packet_wq; | ||
| 98 | } tx; | ||
| 99 | |||
| 100 | struct { | ||
| 101 | struct task_struct *thread; | ||
| 102 | struct wait_queue_head wq; | ||
| 103 | struct kfifo fifo; | ||
| 104 | struct sshp_buf buf; | ||
| 105 | |||
| 106 | struct { | ||
| 107 | u16 seqs[8]; | ||
| 108 | u16 offset; | ||
| 109 | } blocked; | ||
| 110 | } rx; | ||
| 111 | |||
| 112 | struct { | ||
| 113 | spinlock_t lock; | ||
| 114 | ktime_t timeout; | ||
| 115 | ktime_t expires; | ||
| 116 | struct delayed_work reaper; | ||
| 117 | } rtx_timeout; | ||
| 118 | |||
| 119 | struct ssh_ptl_ops ops; | ||
| 120 | }; | ||
| 121 | |||
| 122 | #define __ssam_prcond(func, p, fmt, ...) \ | ||
| 123 | do { \ | ||
| 124 | typeof(p) __p = (p); \ | ||
| 125 | \ | ||
| 126 | if (__p) \ | ||
| 127 | func(__p, fmt, ##__VA_ARGS__); \ | ||
| 128 | } while (0) | ||
| 129 | |||
| 130 | #define ptl_dbg(p, fmt, ...) dev_dbg(&(p)->serdev->dev, fmt, ##__VA_ARGS__) | ||
| 131 | #define ptl_info(p, fmt, ...) dev_info(&(p)->serdev->dev, fmt, ##__VA_ARGS__) | ||
| 132 | #define ptl_warn(p, fmt, ...) dev_warn(&(p)->serdev->dev, fmt, ##__VA_ARGS__) | ||
| 133 | #define ptl_err(p, fmt, ...) dev_err(&(p)->serdev->dev, fmt, ##__VA_ARGS__) | ||
| 134 | #define ptl_dbg_cond(p, fmt, ...) __ssam_prcond(ptl_dbg, p, fmt, ##__VA_ARGS__) | ||
| 135 | |||
| 136 | #define to_ssh_ptl(ptr, member) \ | ||
| 137 | container_of(ptr, struct ssh_ptl, member) | ||
| 138 | |||
| 139 | int ssh_ptl_init(struct ssh_ptl *ptl, struct serdev_device *serdev, | ||
| 140 | struct ssh_ptl_ops *ops); | ||
| 141 | |||
| 142 | void ssh_ptl_destroy(struct ssh_ptl *ptl); | ||
| 143 | |||
| 144 | /** | ||
| 145 | * ssh_ptl_get_device() - Get device associated with packet transport layer. | ||
| 146 | * @ptl: The packet transport layer. | ||
| 147 | * | ||
| 148 | * Return: Returns the device on which the given packet transport layer builds | ||
| 149 | * upon. | ||
| 150 | */ | ||
| 151 | static inline struct device *ssh_ptl_get_device(struct ssh_ptl *ptl) | ||
| 152 | { | ||
| 153 | return ptl->serdev ? &ptl->serdev->dev : NULL; | ||
| 154 | } | ||
| 155 | |||
| 156 | int ssh_ptl_tx_start(struct ssh_ptl *ptl); | ||
| 157 | int ssh_ptl_tx_stop(struct ssh_ptl *ptl); | ||
| 158 | int ssh_ptl_rx_start(struct ssh_ptl *ptl); | ||
| 159 | int ssh_ptl_rx_stop(struct ssh_ptl *ptl); | ||
| 160 | void ssh_ptl_shutdown(struct ssh_ptl *ptl); | ||
| 161 | |||
| 162 | int ssh_ptl_submit(struct ssh_ptl *ptl, struct ssh_packet *p); | ||
| 163 | void ssh_ptl_cancel(struct ssh_packet *p); | ||
| 164 | |||
| 165 | int ssh_ptl_rx_rcvbuf(struct ssh_ptl *ptl, const u8 *buf, size_t n); | ||
| 166 | |||
| 167 | /** | ||
| 168 | * ssh_ptl_tx_wakeup_transfer() - Wake up packet transmitter thread for | ||
| 169 | * transfer. | ||
| 170 | * @ptl: The packet transport layer. | ||
| 171 | * | ||
| 172 | * Wakes up the packet transmitter thread, notifying it that the underlying | ||
| 173 | * transport has more space for data to be transmitted. If the packet | ||
| 174 | * transport layer has been shut down, calls to this function will be ignored. | ||
| 175 | */ | ||
| 176 | static inline void ssh_ptl_tx_wakeup_transfer(struct ssh_ptl *ptl) | ||
| 177 | { | ||
| 178 | if (test_bit(SSH_PTL_SF_SHUTDOWN_BIT, &ptl->state)) | ||
| 179 | return; | ||
| 180 | |||
| 181 | complete(&ptl->tx.thread_cplt_tx); | ||
| 182 | } | ||
| 183 | |||
| 184 | void ssh_packet_init(struct ssh_packet *packet, unsigned long type, | ||
| 185 | u8 priority, const struct ssh_packet_ops *ops); | ||
| 186 | |||
| 187 | int ssh_ctrl_packet_cache_init(void); | ||
| 188 | void ssh_ctrl_packet_cache_destroy(void); | ||
| 189 | |||
| 190 | #endif /* _SURFACE_AGGREGATOR_SSH_PACKET_LAYER_H */ | ||
| @@ -0,0 +1,228 @@ | |||
| 1 | // SPDX-License-Identifier: GPL-2.0+ | ||
| 2 | /* | ||
| 3 | * SSH message parser. | ||
| 4 | * | ||
| 5 | * Copyright (C) 2019-2020 Maximilian Luz <luzmaximilian@gmail.com> | ||
| 6 | */ | ||
| 7 | |||
| 8 | #include <asm/unaligned.h> | ||
| 9 | #include <linux/compiler.h> | ||
| 10 | #include <linux/device.h> | ||
| 11 | #include <linux/types.h> | ||
| 12 | |||
| 13 | #include <linux/surface_aggregator/serial_hub.h> | ||
| 14 | #include "ssh_parser.h" | ||
| 15 | |||
| 16 | /** | ||
| 17 | * sshp_validate_crc() - Validate a CRC in raw message data. | ||
| 18 | * @src: The span of data over which the CRC should be computed. | ||
| 19 | * @crc: The pointer to the expected u16 CRC value. | ||
| 20 | * | ||
| 21 | * Computes the CRC of the provided data span (@src), compares it to the CRC | ||
| 22 | * stored at the given address (@crc), and returns the result of this | ||
| 23 | * comparison, i.e. %true if equal. This function is intended to run on raw | ||
| 24 | * input/message data. | ||
| 25 | * | ||
| 26 | * Return: Returns %true if the computed CRC matches the stored CRC, %false | ||
| 27 | * otherwise. | ||
| 28 | */ | ||
| 29 | static bool sshp_validate_crc(const struct ssam_span *src, const u8 *crc) | ||
| 30 | { | ||
| 31 | u16 actual = ssh_crc(src->ptr, src->len); | ||
| 32 | u16 expected = get_unaligned_le16(crc); | ||
| 33 | |||
| 34 | return actual == expected; | ||
| 35 | } | ||
| 36 | |||
| 37 | /** | ||
| 38 | * sshp_starts_with_syn() - Check if the given data starts with SSH SYN bytes. | ||
| 39 | * @src: The data span to check the start of. | ||
| 40 | */ | ||
| 41 | static bool sshp_starts_with_syn(const struct ssam_span *src) | ||
| 42 | { | ||
| 43 | return src->len >= 2 && get_unaligned_le16(src->ptr) == SSH_MSG_SYN; | ||
| 44 | } | ||
| 45 | |||
| 46 | /** | ||
| 47 | * sshp_find_syn() - Find SSH SYN bytes in the given data span. | ||
| 48 | * @src: The data span to search in. | ||
| 49 | * @rem: The span (output) indicating the remaining data, starting with SSH | ||
| 50 | * SYN bytes, if found. | ||
| 51 | * | ||
| 52 | * Search for SSH SYN bytes in the given source span. If found, set the @rem | ||
| 53 | * span to the remaining data, starting with the first SYN bytes and capped by | ||
| 54 | * the source span length, and return %true. This function does not copy any | ||
| 55 | * data, but rather only sets pointers to the respective start addresses and | ||
| 56 | * length values. | ||
| 57 | * | ||
| 58 | * If no SSH SYN bytes could be found, set the @rem span to the zero-length | ||
| 59 | * span at the end of the source span and return %false. | ||
| 60 | * | ||
| 61 | * If partial SSH SYN bytes could be found at the end of the source span, set | ||
| 62 | * the @rem span to cover these partial SYN bytes, capped by the end of the | ||
| 63 | * source span, and return %false. This function should then be re-run once | ||
| 64 | * more data is available. | ||
| 65 | * | ||
| 66 | * Return: Returns %true if a complete SSH SYN sequence could be found, | ||
| 67 | * %false otherwise. | ||
| 68 | */ | ||
| 69 | bool sshp_find_syn(const struct ssam_span *src, struct ssam_span *rem) | ||
| 70 | { | ||
| 71 | size_t i; | ||
| 72 | |||
| 73 | for (i = 0; i < src->len - 1; i++) { | ||
| 74 | if (likely(get_unaligned_le16(src->ptr + i) == SSH_MSG_SYN)) { | ||
| 75 | rem->ptr = src->ptr + i; | ||
| 76 | rem->len = src->len - i; | ||
| 77 | return true; | ||
| 78 | } | ||
| 79 | } | ||
| 80 | |||
| 81 | if (unlikely(src->ptr[src->len - 1] == (SSH_MSG_SYN & 0xff))) { | ||
| 82 | rem->ptr = src->ptr + src->len - 1; | ||
| 83 | rem->len = 1; | ||
| 84 | return false; | ||
| 85 | } | ||
| 86 | |||
| 87 | rem->ptr = src->ptr + src->len; | ||
| 88 | rem->len = 0; | ||
| 89 | return false; | ||
| 90 | } | ||
| 91 | |||
| 92 | /** | ||
| 93 | * sshp_parse_frame() - Parse SSH frame. | ||
| 94 | * @dev: The device used for logging. | ||
| 95 | * @source: The source to parse from. | ||
| 96 | * @frame: The parsed frame (output). | ||
| 97 | * @payload: The parsed payload (output). | ||
| 98 | * @maxlen: The maximum supported message length. | ||
| 99 | * | ||
| 100 | * Parses and validates a SSH frame, including its payload, from the given | ||
| 101 | * source. Sets the provided @frame pointer to the start of the frame and | ||
| 102 | * writes the limits of the frame payload to the provided @payload span | ||
| 103 | * pointer. | ||
| 104 | * | ||
| 105 | * This function does not copy any data, but rather only validates the message | ||
| 106 | * data and sets pointers (and length values) to indicate the respective parts. | ||
| 107 | * | ||
| 108 | * If no complete SSH frame could be found, the frame pointer will be set to | ||
| 109 | * the %NULL pointer and the payload span will be set to the null span (start | ||
| 110 | * pointer %NULL, size zero). | ||
| 111 | * | ||
| 112 | * Return: Returns zero on success or if the frame is incomplete, %-ENOMSG if | ||
| 113 | * the start of the message is invalid, %-EBADMSG if any (frame-header or | ||
| 114 | * payload) CRC is invalid, or %-EMSGSIZE if the SSH message is bigger than | ||
| 115 | * the maximum message length specified in the @maxlen parameter. | ||
| 116 | */ | ||
| 117 | int sshp_parse_frame(const struct device *dev, const struct ssam_span *source, | ||
| 118 | struct ssh_frame **frame, struct ssam_span *payload, | ||
| 119 | size_t maxlen) | ||
| 120 | { | ||
| 121 | struct ssam_span sf; | ||
| 122 | struct ssam_span sp; | ||
| 123 | |||
| 124 | /* Initialize output. */ | ||
| 125 | *frame = NULL; | ||
| 126 | payload->ptr = NULL; | ||
| 127 | payload->len = 0; | ||
| 128 | |||
| 129 | if (!sshp_starts_with_syn(source)) { | ||
| 130 | dev_warn(dev, "rx: parser: invalid start of frame\n"); | ||
| 131 | return -ENOMSG; | ||
| 132 | } | ||
| 133 | |||
| 134 | /* Check for minimum packet length. */ | ||
| 135 | if (unlikely(source->len < SSH_MESSAGE_LENGTH(0))) { | ||
| 136 | dev_dbg(dev, "rx: parser: not enough data for frame\n"); | ||
| 137 | return 0; | ||
| 138 | } | ||
| 139 | |||
| 140 | /* Pin down frame. */ | ||
| 141 | sf.ptr = source->ptr + sizeof(u16); | ||
| 142 | sf.len = sizeof(struct ssh_frame); | ||
| 143 | |||
| 144 | /* Validate frame CRC. */ | ||
| 145 | if (unlikely(!sshp_validate_crc(&sf, sf.ptr + sf.len))) { | ||
| 146 | dev_warn(dev, "rx: parser: invalid frame CRC\n"); | ||
| 147 | return -EBADMSG; | ||
| 148 | } | ||
| 149 | |||
| 150 | /* Ensure packet does not exceed maximum length. */ | ||
| 151 | sp.len = get_unaligned_le16(&((struct ssh_frame *)sf.ptr)->len); | ||
| 152 | if (unlikely(SSH_MESSAGE_LENGTH(sp.len) > maxlen)) { | ||
| 153 | dev_warn(dev, "rx: parser: frame too large: %llu bytes\n", | ||
| 154 | SSH_MESSAGE_LENGTH(sp.len)); | ||
| 155 | return -EMSGSIZE; | ||
| 156 | } | ||
| 157 | |||
| 158 | /* Pin down payload. */ | ||
| 159 | sp.ptr = sf.ptr + sf.len + sizeof(u16); | ||
| 160 | |||
| 161 | /* Check for frame + payload length. */ | ||
| 162 | if (source->len < SSH_MESSAGE_LENGTH(sp.len)) { | ||
| 163 | dev_dbg(dev, "rx: parser: not enough data for payload\n"); | ||
| 164 | return 0; | ||
| 165 | } | ||
| 166 | |||
| 167 | /* Validate payload CRC. */ | ||
| 168 | if (unlikely(!sshp_validate_crc(&sp, sp.ptr + sp.len))) { | ||
| 169 | dev_warn(dev, "rx: parser: invalid payload CRC\n"); | ||
| 170 | return -EBADMSG; | ||
| 171 | } | ||
| 172 | |||
| 173 | *frame = (struct ssh_frame *)sf.ptr; | ||
| 174 | *payload = sp; | ||
| 175 | |||
| 176 | dev_dbg(dev, "rx: parser: valid frame found (type: %#04x, len: %u)\n", | ||
| 177 | (*frame)->type, (*frame)->len); | ||
| 178 | |||
| 179 | return 0; | ||
| 180 | } | ||
| 181 | |||
| 182 | /** | ||
| 183 | * sshp_parse_command() - Parse SSH command frame payload. | ||
| 184 | * @dev: The device used for logging. | ||
| 185 | * @source: The source to parse from. | ||
| 186 | * @command: The parsed command (output). | ||
| 187 | * @command_data: The parsed command data/payload (output). | ||
| 188 | * | ||
| 189 | * Parses and validates a SSH command frame payload. Sets the @command pointer | ||
| 190 | * to the command header and the @command_data span to the command data (i.e. | ||
| 191 | * payload of the command). This will result in a zero-length span if the | ||
| 192 | * command does not have any associated data/payload. This function does not | ||
| 193 | * check the frame-payload-type field, which should be checked by the caller | ||
| 194 | * before calling this function. | ||
| 195 | * | ||
| 196 | * The @source parameter should be the complete frame payload, e.g. returned | ||
| 197 | * by the sshp_parse_frame() command. | ||
| 198 | * | ||
| 199 | * This function does not copy any data, but rather only validates the frame | ||
| 200 | * payload data and sets pointers (and length values) to indicate the | ||
| 201 | * respective parts. | ||
| 202 | * | ||
| 203 | * Return: Returns zero on success or %-ENOMSG if @source does not represent a | ||
| 204 | * valid command-type frame payload, i.e. is too short. | ||
| 205 | */ | ||
| 206 | int sshp_parse_command(const struct device *dev, const struct ssam_span *source, | ||
| 207 | struct ssh_command **command, | ||
| 208 | struct ssam_span *command_data) | ||
| 209 | { | ||
| 210 | /* Check for minimum length. */ | ||
| 211 | if (unlikely(source->len < sizeof(struct ssh_command))) { | ||
| 212 | *command = NULL; | ||
| 213 | command_data->ptr = NULL; | ||
| 214 | command_data->len = 0; | ||
| 215 | |||
| 216 | dev_err(dev, "rx: parser: command payload is too short\n"); | ||
| 217 | return -ENOMSG; | ||
| 218 | } | ||
| 219 | |||
| 220 | *command = (struct ssh_command *)source->ptr; | ||
| 221 | command_data->ptr = source->ptr + sizeof(struct ssh_command); | ||
| 222 | command_data->len = source->len - sizeof(struct ssh_command); | ||
| 223 | |||
| 224 | dev_dbg(dev, "rx: parser: valid command found (tc: %#04x, cid: %#04x)\n", | ||
| 225 | (*command)->tc, (*command)->cid); | ||
| 226 | |||
| 227 | return 0; | ||
| 228 | } | ||
| @@ -0,0 +1,154 @@ | |||
| 1 | /* SPDX-License-Identifier: GPL-2.0+ */ | ||
| 2 | /* | ||
| 3 | * SSH message parser. | ||
| 4 | * | ||
| 5 | * Copyright (C) 2019-2020 Maximilian Luz <luzmaximilian@gmail.com> | ||
| 6 | */ | ||
| 7 | |||
| 8 | #ifndef _SURFACE_AGGREGATOR_SSH_PARSER_H | ||
| 9 | #define _SURFACE_AGGREGATOR_SSH_PARSER_H | ||
| 10 | |||
| 11 | #include <linux/device.h> | ||
| 12 | #include <linux/kfifo.h> | ||
| 13 | #include <linux/slab.h> | ||
| 14 | #include <linux/types.h> | ||
| 15 | |||
| 16 | #include <linux/surface_aggregator/serial_hub.h> | ||
| 17 | |||
| 18 | /** | ||
| 19 | * struct sshp_buf - Parser buffer for SSH messages. | ||
| 20 | * @ptr: Pointer to the beginning of the buffer. | ||
| 21 | * @len: Number of bytes used in the buffer. | ||
| 22 | * @cap: Maximum capacity of the buffer. | ||
| 23 | */ | ||
| 24 | struct sshp_buf { | ||
| 25 | u8 *ptr; | ||
| 26 | size_t len; | ||
| 27 | size_t cap; | ||
| 28 | }; | ||
| 29 | |||
| 30 | /** | ||
| 31 | * sshp_buf_init() - Initialize a SSH parser buffer. | ||
| 32 | * @buf: The buffer to initialize. | ||
| 33 | * @ptr: The memory backing the buffer. | ||
| 34 | * @cap: The length of the memory backing the buffer, i.e. its capacity. | ||
| 35 | * | ||
| 36 | * Initializes the buffer with the given memory as backing and set its used | ||
| 37 | * length to zero. | ||
| 38 | */ | ||
| 39 | static inline void sshp_buf_init(struct sshp_buf *buf, u8 *ptr, size_t cap) | ||
| 40 | { | ||
| 41 | buf->ptr = ptr; | ||
| 42 | buf->len = 0; | ||
| 43 | buf->cap = cap; | ||
| 44 | } | ||
| 45 | |||
| 46 | /** | ||
| 47 | * sshp_buf_alloc() - Allocate and initialize a SSH parser buffer. | ||
| 48 | * @buf: The buffer to initialize/allocate to. | ||
| 49 | * @cap: The desired capacity of the buffer. | ||
| 50 | * @flags: The flags used for allocating the memory. | ||
| 51 | * | ||
| 52 | * Allocates @cap bytes and initializes the provided buffer struct with the | ||
| 53 | * allocated memory. | ||
| 54 | * | ||
| 55 | * Return: Returns zero on success and %-ENOMEM if allocation failed. | ||
| 56 | */ | ||
| 57 | static inline int sshp_buf_alloc(struct sshp_buf *buf, size_t cap, gfp_t flags) | ||
| 58 | { | ||
| 59 | u8 *ptr; | ||
| 60 | |||
| 61 | ptr = kzalloc(cap, flags); | ||
| 62 | if (!ptr) | ||
| 63 | return -ENOMEM; | ||
| 64 | |||
| 65 | sshp_buf_init(buf, ptr, cap); | ||
| 66 | return 0; | ||
| 67 | } | ||
| 68 | |||
| 69 | /** | ||
| 70 | * sshp_buf_free() - Free a SSH parser buffer. | ||
| 71 | * @buf: The buffer to free. | ||
| 72 | * | ||
| 73 | * Frees a SSH parser buffer by freeing the memory backing it and then | ||
| 74 | * resetting its pointer to %NULL and length and capacity to zero. Intended to | ||
| 75 | * free a buffer previously allocated with sshp_buf_alloc(). | ||
| 76 | */ | ||
| 77 | static inline void sshp_buf_free(struct sshp_buf *buf) | ||
| 78 | { | ||
| 79 | kfree(buf->ptr); | ||
| 80 | buf->ptr = NULL; | ||
| 81 | buf->len = 0; | ||
| 82 | buf->cap = 0; | ||
| 83 | } | ||
| 84 | |||
| 85 | /** | ||
| 86 | * sshp_buf_drop() - Drop data from the beginning of the buffer. | ||
| 87 | * @buf: The buffer to drop data from. | ||
| 88 | * @n: The number of bytes to drop. | ||
| 89 | * | ||
| 90 | * Drops the first @n bytes from the buffer. Re-aligns any remaining data to | ||
| 91 | * the beginning of the buffer. | ||
| 92 | */ | ||
| 93 | static inline void sshp_buf_drop(struct sshp_buf *buf, size_t n) | ||
| 94 | { | ||
| 95 | memmove(buf->ptr, buf->ptr + n, buf->len - n); | ||
| 96 | buf->len -= n; | ||
| 97 | } | ||
| 98 | |||
| 99 | /** | ||
| 100 | * sshp_buf_read_from_fifo() - Transfer data from a fifo to the buffer. | ||
| 101 | * @buf: The buffer to write the data into. | ||
| 102 | * @fifo: The fifo to read the data from. | ||
| 103 | * | ||
| 104 | * Transfers the data contained in the fifo to the buffer, removing it from | ||
| 105 | * the fifo. This function will try to transfer as much data as possible, | ||
| 106 | * limited either by the remaining space in the buffer or by the number of | ||
| 107 | * bytes available in the fifo. | ||
| 108 | * | ||
| 109 | * Return: Returns the number of bytes transferred. | ||
| 110 | */ | ||
| 111 | static inline size_t sshp_buf_read_from_fifo(struct sshp_buf *buf, | ||
| 112 | struct kfifo *fifo) | ||
| 113 | { | ||
| 114 | size_t n; | ||
| 115 | |||
| 116 | n = kfifo_out(fifo, buf->ptr + buf->len, buf->cap - buf->len); | ||
| 117 | buf->len += n; | ||
| 118 | |||
| 119 | return n; | ||
| 120 | } | ||
| 121 | |||
| 122 | /** | ||
| 123 | * sshp_buf_span_from() - Initialize a span from the given buffer and offset. | ||
| 124 | * @buf: The buffer to create the span from. | ||
| 125 | * @offset: The offset in the buffer at which the span should start. | ||
| 126 | * @span: The span to initialize (output). | ||
| 127 | * | ||
| 128 | * Initializes the provided span to point to the memory at the given offset in | ||
| 129 | * the buffer, with the length of the span being capped by the number of bytes | ||
| 130 | * used in the buffer after the offset (i.e. bytes remaining after the | ||
| 131 | * offset). | ||
| 132 | * | ||
| 133 | * Warning: This function does not validate that @offset is less than or equal | ||
| 134 | * to the number of bytes used in the buffer or the buffer capacity. This must | ||
| 135 | * be guaranteed by the caller. | ||
| 136 | */ | ||
| 137 | static inline void sshp_buf_span_from(struct sshp_buf *buf, size_t offset, | ||
| 138 | struct ssam_span *span) | ||
| 139 | { | ||
| 140 | span->ptr = buf->ptr + offset; | ||
| 141 | span->len = buf->len - offset; | ||
| 142 | } | ||
| 143 | |||
| 144 | bool sshp_find_syn(const struct ssam_span *src, struct ssam_span *rem); | ||
| 145 | |||
| 146 | int sshp_parse_frame(const struct device *dev, const struct ssam_span *source, | ||
| 147 | struct ssh_frame **frame, struct ssam_span *payload, | ||
| 148 | size_t maxlen); | ||
| 149 | |||
| 150 | int sshp_parse_command(const struct device *dev, const struct ssam_span *source, | ||
| 151 | struct ssh_command **command, | ||
| 152 | struct ssam_span *command_data); | ||
| 153 | |||
| 154 | #endif /* _SURFACE_AGGREGATOR_SSH_PARSER_h */ | ||
| @@ -0,0 +1,1263 @@ | |||
| 1 | // SPDX-License-Identifier: GPL-2.0+ | ||
| 2 | /* | ||
| 3 | * SSH request transport layer. | ||
| 4 | * | ||
| 5 | * Copyright (C) 2019-2020 Maximilian Luz <luzmaximilian@gmail.com> | ||
| 6 | */ | ||
| 7 | |||
| 8 | #include <asm/unaligned.h> | ||
| 9 | #include <linux/atomic.h> | ||
| 10 | #include <linux/completion.h> | ||
| 11 | #include <linux/error-injection.h> | ||
| 12 | #include <linux/ktime.h> | ||
| 13 | #include <linux/limits.h> | ||
| 14 | #include <linux/list.h> | ||
| 15 | #include <linux/slab.h> | ||
| 16 | #include <linux/spinlock.h> | ||
| 17 | #include <linux/types.h> | ||
| 18 | #include <linux/workqueue.h> | ||
| 19 | |||
| 20 | #include <linux/surface_aggregator/serial_hub.h> | ||
| 21 | #include <linux/surface_aggregator/controller.h> | ||
| 22 | |||
| 23 | #include "ssh_packet_layer.h" | ||
| 24 | #include "ssh_request_layer.h" | ||
| 25 | |||
| 26 | #include "trace.h" | ||
| 27 | |||
| 28 | /* | ||
| 29 | * SSH_RTL_REQUEST_TIMEOUT - Request timeout. | ||
| 30 | * | ||
| 31 | * Timeout as ktime_t delta for request responses. If we have not received a | ||
| 32 | * response in this time-frame after finishing the underlying packet | ||
| 33 | * transmission, the request will be completed with %-ETIMEDOUT as status | ||
| 34 | * code. | ||
| 35 | */ | ||
| 36 | #define SSH_RTL_REQUEST_TIMEOUT ms_to_ktime(3000) | ||
| 37 | |||
| 38 | /* | ||
| 39 | * SSH_RTL_REQUEST_TIMEOUT_RESOLUTION - Request timeout granularity. | ||
| 40 | * | ||
| 41 | * Time-resolution for timeouts. Should be larger than one jiffy to avoid | ||
| 42 | * direct re-scheduling of reaper work_struct. | ||
| 43 | */ | ||
| 44 | #define SSH_RTL_REQUEST_TIMEOUT_RESOLUTION ms_to_ktime(max(2000 / HZ, 50)) | ||
| 45 | |||
| 46 | /* | ||
| 47 | * SSH_RTL_MAX_PENDING - Maximum number of pending requests. | ||
| 48 | * | ||
| 49 | * Maximum number of requests concurrently waiting to be completed (i.e. | ||
| 50 | * waiting for the corresponding packet transmission to finish if they don't | ||
| 51 | * have a response or waiting for a response if they have one). | ||
| 52 | */ | ||
| 53 | #define SSH_RTL_MAX_PENDING 3 | ||
| 54 | |||
| 55 | /* | ||
| 56 | * SSH_RTL_TX_BATCH - Maximum number of requests processed per work execution. | ||
| 57 | * Used to prevent livelocking of the workqueue. Value chosen via educated | ||
| 58 | * guess, may be adjusted. | ||
| 59 | */ | ||
| 60 | #define SSH_RTL_TX_BATCH 10 | ||
| 61 | |||
| 62 | #ifdef CONFIG_SURFACE_AGGREGATOR_ERROR_INJECTION | ||
| 63 | |||
| 64 | /** | ||
| 65 | * ssh_rtl_should_drop_response() - Error injection hook to drop request | ||
| 66 | * responses. | ||
| 67 | * | ||
| 68 | * Useful to cause request transmission timeouts in the driver by dropping the | ||
| 69 | * response to a request. | ||
| 70 | */ | ||
| 71 | static noinline bool ssh_rtl_should_drop_response(void) | ||
| 72 | { | ||
| 73 | return false; | ||
| 74 | } | ||
| 75 | ALLOW_ERROR_INJECTION(ssh_rtl_should_drop_response, TRUE); | ||
| 76 | |||
| 77 | #else | ||
| 78 | |||
| 79 | static inline bool ssh_rtl_should_drop_response(void) | ||
| 80 | { | ||
| 81 | return false; | ||
| 82 | } | ||
| 83 | |||
| 84 | #endif | ||
| 85 | |||
| 86 | static u16 ssh_request_get_rqid(struct ssh_request *rqst) | ||
| 87 | { | ||
| 88 | return get_unaligned_le16(rqst->packet.data.ptr | ||
| 89 | + SSH_MSGOFFSET_COMMAND(rqid)); | ||
| 90 | } | ||
| 91 | |||
| 92 | static u32 ssh_request_get_rqid_safe(struct ssh_request *rqst) | ||
| 93 | { | ||
| 94 | if (!rqst->packet.data.ptr) | ||
| 95 | return U32_MAX; | ||
| 96 | |||
| 97 | return ssh_request_get_rqid(rqst); | ||
| 98 | } | ||
| 99 | |||
| 100 | static void ssh_rtl_queue_remove(struct ssh_request *rqst) | ||
| 101 | { | ||
| 102 | struct ssh_rtl *rtl = ssh_request_rtl(rqst); | ||
| 103 | |||
| 104 | spin_lock(&rtl->queue.lock); | ||
| 105 | |||
| 106 | if (!test_and_clear_bit(SSH_REQUEST_SF_QUEUED_BIT, &rqst->state)) { | ||
| 107 | spin_unlock(&rtl->queue.lock); | ||
| 108 | return; | ||
| 109 | } | ||
| 110 | |||
| 111 | list_del(&rqst->node); | ||
| 112 | |||
| 113 | spin_unlock(&rtl->queue.lock); | ||
| 114 | ssh_request_put(rqst); | ||
| 115 | } | ||
| 116 | |||
| 117 | static bool ssh_rtl_queue_empty(struct ssh_rtl *rtl) | ||
| 118 | { | ||
| 119 | bool empty; | ||
| 120 | |||
| 121 | spin_lock(&rtl->queue.lock); | ||
| 122 | empty = list_empty(&rtl->queue.head); | ||
| 123 | spin_unlock(&rtl->queue.lock); | ||
| 124 | |||
| 125 | return empty; | ||
| 126 | } | ||
| 127 | |||
| 128 | static void ssh_rtl_pending_remove(struct ssh_request *rqst) | ||
| 129 | { | ||
| 130 | struct ssh_rtl *rtl = ssh_request_rtl(rqst); | ||
| 131 | |||
| 132 | spin_lock(&rtl->pending.lock); | ||
| 133 | |||
| 134 | if (!test_and_clear_bit(SSH_REQUEST_SF_PENDING_BIT, &rqst->state)) { | ||
| 135 | spin_unlock(&rtl->pending.lock); | ||
| 136 | return; | ||
| 137 | } | ||
| 138 | |||
| 139 | atomic_dec(&rtl->pending.count); | ||
| 140 | list_del(&rqst->node); | ||
| 141 | |||
| 142 | spin_unlock(&rtl->pending.lock); | ||
| 143 | |||
| 144 | ssh_request_put(rqst); | ||
| 145 | } | ||
| 146 | |||
| 147 | static int ssh_rtl_tx_pending_push(struct ssh_request *rqst) | ||
| 148 | { | ||
| 149 | struct ssh_rtl *rtl = ssh_request_rtl(rqst); | ||
| 150 | |||
| 151 | spin_lock(&rtl->pending.lock); | ||
| 152 | |||
| 153 | if (test_bit(SSH_REQUEST_SF_LOCKED_BIT, &rqst->state)) { | ||
| 154 | spin_unlock(&rtl->pending.lock); | ||
| 155 | return -EINVAL; | ||
| 156 | } | ||
| 157 | |||
| 158 | if (test_and_set_bit(SSH_REQUEST_SF_PENDING_BIT, &rqst->state)) { | ||
| 159 | spin_unlock(&rtl->pending.lock); | ||
| 160 | return -EALREADY; | ||
| 161 | } | ||
| 162 | |||
| 163 | atomic_inc(&rtl->pending.count); | ||
| 164 | list_add_tail(&ssh_request_get(rqst)->node, &rtl->pending.head); | ||
| 165 | |||
| 166 | spin_unlock(&rtl->pending.lock); | ||
| 167 | return 0; | ||
| 168 | } | ||
| 169 | |||
| 170 | static void ssh_rtl_complete_with_status(struct ssh_request *rqst, int status) | ||
| 171 | { | ||
| 172 | struct ssh_rtl *rtl = ssh_request_rtl(rqst); | ||
| 173 | |||
| 174 | trace_ssam_request_complete(rqst, status); | ||
| 175 | |||
| 176 | /* rtl/ptl may not be set if we're canceling before submitting. */ | ||
| 177 | rtl_dbg_cond(rtl, "rtl: completing request (rqid: %#06x, status: %d)\n", | ||
| 178 | ssh_request_get_rqid_safe(rqst), status); | ||
| 179 | |||
| 180 | rqst->ops->complete(rqst, NULL, NULL, status); | ||
| 181 | } | ||
| 182 | |||
| 183 | static void ssh_rtl_complete_with_rsp(struct ssh_request *rqst, | ||
| 184 | const struct ssh_command *cmd, | ||
| 185 | const struct ssam_span *data) | ||
| 186 | { | ||
| 187 | struct ssh_rtl *rtl = ssh_request_rtl(rqst); | ||
| 188 | |||
| 189 | trace_ssam_request_complete(rqst, 0); | ||
| 190 | |||
| 191 | rtl_dbg(rtl, "rtl: completing request with response (rqid: %#06x)\n", | ||
| 192 | ssh_request_get_rqid(rqst)); | ||
| 193 | |||
| 194 | rqst->ops->complete(rqst, cmd, data, 0); | ||
| 195 | } | ||
| 196 | |||
| 197 | static bool ssh_rtl_tx_can_process(struct ssh_request *rqst) | ||
| 198 | { | ||
| 199 | struct ssh_rtl *rtl = ssh_request_rtl(rqst); | ||
| 200 | |||
| 201 | if (test_bit(SSH_REQUEST_TY_FLUSH_BIT, &rqst->state)) | ||
| 202 | return !atomic_read(&rtl->pending.count); | ||
| 203 | |||
| 204 | return atomic_read(&rtl->pending.count) < SSH_RTL_MAX_PENDING; | ||
| 205 | } | ||
| 206 | |||
| 207 | static struct ssh_request *ssh_rtl_tx_next(struct ssh_rtl *rtl) | ||
| 208 | { | ||
| 209 | struct ssh_request *rqst = ERR_PTR(-ENOENT); | ||
| 210 | struct ssh_request *p, *n; | ||
| 211 | |||
| 212 | spin_lock(&rtl->queue.lock); | ||
| 213 | |||
| 214 | /* Find first non-locked request and remove it. */ | ||
| 215 | list_for_each_entry_safe(p, n, &rtl->queue.head, node) { | ||
| 216 | if (unlikely(test_bit(SSH_REQUEST_SF_LOCKED_BIT, &p->state))) | ||
| 217 | continue; | ||
| 218 | |||
| 219 | if (!ssh_rtl_tx_can_process(p)) { | ||
| 220 | rqst = ERR_PTR(-EBUSY); | ||
| 221 | break; | ||
| 222 | } | ||
| 223 | |||
| 224 | /* Remove from queue and mark as transmitting. */ | ||
| 225 | set_bit(SSH_REQUEST_SF_TRANSMITTING_BIT, &p->state); | ||
| 226 | /* Ensure state never gets zero. */ | ||
| 227 | smp_mb__before_atomic(); | ||
| 228 | clear_bit(SSH_REQUEST_SF_QUEUED_BIT, &p->state); | ||
| 229 | |||
| 230 | list_del(&p->node); | ||
| 231 | |||
| 232 | rqst = p; | ||
| 233 | break; | ||
| 234 | } | ||
| 235 | |||
| 236 | spin_unlock(&rtl->queue.lock); | ||
| 237 | return rqst; | ||
| 238 | } | ||
| 239 | |||
| 240 | static int ssh_rtl_tx_try_process_one(struct ssh_rtl *rtl) | ||
| 241 | { | ||
| 242 | struct ssh_request *rqst; | ||
| 243 | int status; | ||
| 244 | |||
| 245 | /* Get and prepare next request for transmit. */ | ||
| 246 | rqst = ssh_rtl_tx_next(rtl); | ||
| 247 | if (IS_ERR(rqst)) | ||
| 248 | return PTR_ERR(rqst); | ||
| 249 | |||
| 250 | /* Add it to/mark it as pending. */ | ||
| 251 | status = ssh_rtl_tx_pending_push(rqst); | ||
| 252 | if (status) { | ||
| 253 | ssh_request_put(rqst); | ||
| 254 | return -EAGAIN; | ||
| 255 | } | ||
| 256 | |||
| 257 | /* Submit packet. */ | ||
| 258 | status = ssh_ptl_submit(&rtl->ptl, &rqst->packet); | ||
| 259 | if (status == -ESHUTDOWN) { | ||
| 260 | /* | ||
| 261 | * Packet has been refused due to the packet layer shutting | ||
| 262 | * down. Complete it here. | ||
| 263 | */ | ||
| 264 | set_bit(SSH_REQUEST_SF_LOCKED_BIT, &rqst->state); | ||
| 265 | /* | ||
| 266 | * Note: A barrier is not required here, as there are only two | ||
| 267 | * references in the system at this point: The one that we have, | ||
| 268 | * and the other one that belongs to the pending set. Due to the | ||
| 269 | * request being marked as "transmitting", our process is the | ||
| 270 | * only one allowed to remove the pending node and change the | ||
| 271 | * state. Normally, the task would fall to the packet callback, | ||
| 272 | * but as this is a path where submission failed, this callback | ||
| 273 | * will never be executed. | ||
| 274 | */ | ||
| 275 | |||
| 276 | ssh_rtl_pending_remove(rqst); | ||
| 277 | ssh_rtl_complete_with_status(rqst, -ESHUTDOWN); | ||
| 278 | |||
| 279 | ssh_request_put(rqst); | ||
| 280 | return -ESHUTDOWN; | ||
| 281 | |||
| 282 | } else if (status) { | ||
| 283 | /* | ||
| 284 | * If submitting the packet failed and the packet layer isn't | ||
| 285 | * shutting down, the packet has either been submitted/queued | ||
| 286 | * before (-EALREADY, which cannot happen as we have | ||
| 287 | * guaranteed that requests cannot be re-submitted), or the | ||
| 288 | * packet was marked as locked (-EINVAL). To mark the packet | ||
| 289 | * locked at this stage, the request, and thus the packets | ||
| 290 | * itself, had to have been canceled. Simply drop the | ||
| 291 | * reference. Cancellation itself will remove it from the set | ||
| 292 | * of pending requests. | ||
| 293 | */ | ||
| 294 | |||
| 295 | WARN_ON(status != -EINVAL); | ||
| 296 | |||
| 297 | ssh_request_put(rqst); | ||
| 298 | return -EAGAIN; | ||
| 299 | } | ||
| 300 | |||
| 301 | ssh_request_put(rqst); | ||
| 302 | return 0; | ||
| 303 | } | ||
| 304 | |||
| 305 | static bool ssh_rtl_tx_schedule(struct ssh_rtl *rtl) | ||
| 306 | { | ||
| 307 | if (atomic_read(&rtl->pending.count) >= SSH_RTL_MAX_PENDING) | ||
| 308 | return false; | ||
| 309 | |||
| 310 | if (ssh_rtl_queue_empty(rtl)) | ||
| 311 | return false; | ||
| 312 | |||
| 313 | return schedule_work(&rtl->tx.work); | ||
| 314 | } | ||
| 315 | |||
| 316 | static void ssh_rtl_tx_work_fn(struct work_struct *work) | ||
| 317 | { | ||
| 318 | struct ssh_rtl *rtl = to_ssh_rtl(work, tx.work); | ||
| 319 | unsigned int iterations = SSH_RTL_TX_BATCH; | ||
| 320 | int status; | ||
| 321 | |||
| 322 | /* | ||
| 323 | * Try to be nice and not block/live-lock the workqueue: Run a maximum | ||
| 324 | * of 10 tries, then re-submit if necessary. This should not be | ||
| 325 | * necessary for normal execution, but guarantee it anyway. | ||
| 326 | */ | ||
| 327 | do { | ||
| 328 | status = ssh_rtl_tx_try_process_one(rtl); | ||
| 329 | if (status == -ENOENT || status == -EBUSY) | ||
| 330 | return; /* No more requests to process. */ | ||
| 331 | |||
| 332 | if (status == -ESHUTDOWN) { | ||
| 333 | /* | ||
| 334 | * Packet system shutting down. No new packets can be | ||
| 335 | * transmitted. Return silently, the party initiating | ||
| 336 | * the shutdown should handle the rest. | ||
| 337 | */ | ||
| 338 | return; | ||
| 339 | } | ||
| 340 | |||
| 341 | WARN_ON(status != 0 && status != -EAGAIN); | ||
| 342 | } while (--iterations); | ||
| 343 | |||
| 344 | /* Out of tries, reschedule. */ | ||
| 345 | ssh_rtl_tx_schedule(rtl); | ||
| 346 | } | ||
| 347 | |||
| 348 | /** | ||
| 349 | * ssh_rtl_submit() - Submit a request to the transport layer. | ||
| 350 | * @rtl: The request transport layer. | ||
| 351 | * @rqst: The request to submit. | ||
| 352 | * | ||
| 353 | * Submits a request to the transport layer. A single request may not be | ||
| 354 | * submitted multiple times without reinitializing it. | ||
| 355 | * | ||
| 356 | * Return: Returns zero on success, %-EINVAL if the request type is invalid or | ||
| 357 | * the request has been canceled prior to submission, %-EALREADY if the | ||
| 358 | * request has already been submitted, or %-ESHUTDOWN in case the request | ||
| 359 | * transport layer has been shut down. | ||
| 360 | */ | ||
| 361 | int ssh_rtl_submit(struct ssh_rtl *rtl, struct ssh_request *rqst) | ||
| 362 | { | ||
| 363 | trace_ssam_request_submit(rqst); | ||
| 364 | |||
| 365 | /* | ||
| 366 | * Ensure that requests expecting a response are sequenced. If this | ||
| 367 | * invariant ever changes, see the comment in ssh_rtl_complete() on what | ||
| 368 | * is required to be changed in the code. | ||
| 369 | */ | ||
| 370 | if (test_bit(SSH_REQUEST_TY_HAS_RESPONSE_BIT, &rqst->state)) | ||
| 371 | if (!test_bit(SSH_PACKET_TY_SEQUENCED_BIT, &rqst->packet.state)) | ||
| 372 | return -EINVAL; | ||
| 373 | |||
| 374 | spin_lock(&rtl->queue.lock); | ||
| 375 | |||
| 376 | /* | ||
| 377 | * Try to set ptl and check if this request has already been submitted. | ||
| 378 | * | ||
| 379 | * Must be inside lock as we might run into a lost update problem | ||
| 380 | * otherwise: If this were outside of the lock, cancellation in | ||
| 381 | * ssh_rtl_cancel_nonpending() may run after we've set the ptl | ||
| 382 | * reference but before we enter the lock. In that case, we'd detect | ||
| 383 | * that the request is being added to the queue and would try to remove | ||
| 384 | * it from that, but removal might fail because it hasn't actually been | ||
| 385 | * added yet. By putting this cmpxchg in the critical section, we | ||
| 386 | * ensure that the queuing detection only triggers when we are already | ||
| 387 | * in the critical section and the remove process will wait until the | ||
| 388 | * push operation has been completed (via lock) due to that. Only then, | ||
| 389 | * we can safely try to remove it. | ||
| 390 | */ | ||
| 391 | if (cmpxchg(&rqst->packet.ptl, NULL, &rtl->ptl)) { | ||
| 392 | spin_unlock(&rtl->queue.lock); | ||
| 393 | return -EALREADY; | ||
| 394 | } | ||
| 395 | |||
| 396 | /* | ||
| 397 | * Ensure that we set ptl reference before we continue modifying state. | ||
| 398 | * This is required for non-pending cancellation. This barrier is paired | ||
| 399 | * with the one in ssh_rtl_cancel_nonpending(). | ||
| 400 | * | ||
| 401 | * By setting the ptl reference before we test for "locked", we can | ||
| 402 | * check if the "locked" test may have already run. See comments in | ||
| 403 | * ssh_rtl_cancel_nonpending() for more detail. | ||
| 404 | */ | ||
| 405 | smp_mb__after_atomic(); | ||
| 406 | |||
| 407 | if (test_bit(SSH_RTL_SF_SHUTDOWN_BIT, &rtl->state)) { | ||
| 408 | spin_unlock(&rtl->queue.lock); | ||
| 409 | return -ESHUTDOWN; | ||
| 410 | } | ||
| 411 | |||
| 412 | if (test_bit(SSH_REQUEST_SF_LOCKED_BIT, &rqst->state)) { | ||
| 413 | spin_unlock(&rtl->queue.lock); | ||
| 414 | return -EINVAL; | ||
| 415 | } | ||
| 416 | |||
| 417 | set_bit(SSH_REQUEST_SF_QUEUED_BIT, &rqst->state); | ||
| 418 | list_add_tail(&ssh_request_get(rqst)->node, &rtl->queue.head); | ||
| 419 | |||
| 420 | spin_unlock(&rtl->queue.lock); | ||
| 421 | |||
| 422 | ssh_rtl_tx_schedule(rtl); | ||
| 423 | return 0; | ||
| 424 | } | ||
| 425 | |||
| 426 | static void ssh_rtl_timeout_reaper_mod(struct ssh_rtl *rtl, ktime_t now, | ||
| 427 | ktime_t expires) | ||
| 428 | { | ||
| 429 | unsigned long delta = msecs_to_jiffies(ktime_ms_delta(expires, now)); | ||
| 430 | ktime_t aexp = ktime_add(expires, SSH_RTL_REQUEST_TIMEOUT_RESOLUTION); | ||
| 431 | |||
| 432 | spin_lock(&rtl->rtx_timeout.lock); | ||
| 433 | |||
| 434 | /* Re-adjust / schedule reaper only if it is above resolution delta. */ | ||
| 435 | if (ktime_before(aexp, rtl->rtx_timeout.expires)) { | ||
| 436 | rtl->rtx_timeout.expires = expires; | ||
| 437 | mod_delayed_work(system_wq, &rtl->rtx_timeout.reaper, delta); | ||
| 438 | } | ||
| 439 | |||
| 440 | spin_unlock(&rtl->rtx_timeout.lock); | ||
| 441 | } | ||
| 442 | |||
| 443 | static void ssh_rtl_timeout_start(struct ssh_request *rqst) | ||
| 444 | { | ||
| 445 | struct ssh_rtl *rtl = ssh_request_rtl(rqst); | ||
| 446 | ktime_t timestamp = ktime_get_coarse_boottime(); | ||
| 447 | ktime_t timeout = rtl->rtx_timeout.timeout; | ||
| 448 | |||
| 449 | if (test_bit(SSH_REQUEST_SF_LOCKED_BIT, &rqst->state)) | ||
| 450 | return; | ||
| 451 | |||
| 452 | /* | ||
| 453 | * Note: The timestamp gets set only once. This happens on the packet | ||
| 454 | * callback. All other access to it is read-only. | ||
| 455 | */ | ||
| 456 | WRITE_ONCE(rqst->timestamp, timestamp); | ||
| 457 | /* | ||
| 458 | * Ensure timestamp is set before starting the reaper. Paired with | ||
| 459 | * implicit barrier following check on ssh_request_get_expiration() in | ||
| 460 | * ssh_rtl_timeout_reap. | ||
| 461 | */ | ||
| 462 | smp_mb__after_atomic(); | ||
| 463 | |||
| 464 | ssh_rtl_timeout_reaper_mod(rtl, timestamp, timestamp + timeout); | ||
| 465 | } | ||
| 466 | |||
| 467 | static void ssh_rtl_complete(struct ssh_rtl *rtl, | ||
| 468 | const struct ssh_command *command, | ||
| 469 | const struct ssam_span *command_data) | ||
| 470 | { | ||
| 471 | struct ssh_request *r = NULL; | ||
| 472 | struct ssh_request *p, *n; | ||
| 473 | u16 rqid = get_unaligned_le16(&command->rqid); | ||
| 474 | |||
| 475 | trace_ssam_rx_response_received(command, command_data->len); | ||
| 476 | |||
| 477 | /* | ||
| 478 | * Get request from pending based on request ID and mark it as response | ||
| 479 | * received and locked. | ||
| 480 | */ | ||
| 481 | spin_lock(&rtl->pending.lock); | ||
| 482 | list_for_each_entry_safe(p, n, &rtl->pending.head, node) { | ||
| 483 | /* We generally expect requests to be processed in order. */ | ||
| 484 | if (unlikely(ssh_request_get_rqid(p) != rqid)) | ||
| 485 | continue; | ||
| 486 | |||
| 487 | /* Simulate response timeout. */ | ||
| 488 | if (ssh_rtl_should_drop_response()) { | ||
| 489 | spin_unlock(&rtl->pending.lock); | ||
| 490 | |||
| 491 | trace_ssam_ei_rx_drop_response(p); | ||
| 492 | rtl_info(rtl, "request error injection: dropping response for request %p\n", | ||
| 493 | &p->packet); | ||
| 494 | return; | ||
| 495 | } | ||
| 496 | |||
| 497 | /* | ||
| 498 | * Mark as "response received" and "locked" as we're going to | ||
| 499 | * complete it. | ||
| 500 | */ | ||
| 501 | set_bit(SSH_REQUEST_SF_LOCKED_BIT, &p->state); | ||
| 502 | set_bit(SSH_REQUEST_SF_RSPRCVD_BIT, &p->state); | ||
| 503 | /* Ensure state never gets zero. */ | ||
| 504 | smp_mb__before_atomic(); | ||
| 505 | clear_bit(SSH_REQUEST_SF_PENDING_BIT, &p->state); | ||
| 506 | |||
| 507 | atomic_dec(&rtl->pending.count); | ||
| 508 | list_del(&p->node); | ||
| 509 | |||
| 510 | r = p; | ||
| 511 | break; | ||
| 512 | } | ||
| 513 | spin_unlock(&rtl->pending.lock); | ||
| 514 | |||
| 515 | if (!r) { | ||
| 516 | rtl_warn(rtl, "rtl: dropping unexpected command message (rqid = %#06x)\n", | ||
| 517 | rqid); | ||
| 518 | return; | ||
| 519 | } | ||
| 520 | |||
| 521 | /* If the request hasn't been completed yet, we will do this now. */ | ||
| 522 | if (test_and_set_bit(SSH_REQUEST_SF_COMPLETED_BIT, &r->state)) { | ||
| 523 | ssh_request_put(r); | ||
| 524 | ssh_rtl_tx_schedule(rtl); | ||
| 525 | return; | ||
| 526 | } | ||
| 527 | |||
| 528 | /* | ||
| 529 | * Make sure the request has been transmitted. In case of a sequenced | ||
| 530 | * request, we are guaranteed that the completion callback will run on | ||
| 531 | * the receiver thread directly when the ACK for the packet has been | ||
| 532 | * received. Similarly, this function is guaranteed to run on the | ||
| 533 | * receiver thread. Thus we are guaranteed that if the packet has been | ||
| 534 | * successfully transmitted and received an ACK, the transmitted flag | ||
| 535 | * has been set and is visible here. | ||
| 536 | * | ||
| 537 | * We are currently not handling unsequenced packets here, as those | ||
| 538 | * should never expect a response as ensured in ssh_rtl_submit. If this | ||
| 539 | * ever changes, one would have to test for | ||
| 540 | * | ||
| 541 | * (r->state & (transmitting | transmitted)) | ||
| 542 | * | ||
| 543 | * on unsequenced packets to determine if they could have been | ||
| 544 | * transmitted. There are no synchronization guarantees as in the | ||
| 545 | * sequenced case, since, in this case, the callback function will not | ||
| 546 | * run on the same thread. Thus an exact determination is impossible. | ||
| 547 | */ | ||
| 548 | if (!test_bit(SSH_REQUEST_SF_TRANSMITTED_BIT, &r->state)) { | ||
| 549 | rtl_err(rtl, "rtl: received response before ACK for request (rqid = %#06x)\n", | ||
| 550 | rqid); | ||
| 551 | |||
| 552 | /* | ||
| 553 | * NB: Timeout has already been canceled, request already been | ||
| 554 | * removed from pending and marked as locked and completed. As | ||
| 555 | * we receive a "false" response, the packet might still be | ||
| 556 | * queued though. | ||
| 557 | */ | ||
| 558 | ssh_rtl_queue_remove(r); | ||
| 559 | |||
| 560 | ssh_rtl_complete_with_status(r, -EREMOTEIO); | ||
| 561 | ssh_request_put(r); | ||
| 562 | |||
| 563 | ssh_rtl_tx_schedule(rtl); | ||
| 564 | return; | ||
| 565 | } | ||
| 566 | |||
| 567 | /* | ||
| 568 | * NB: Timeout has already been canceled, request already been | ||
| 569 | * removed from pending and marked as locked and completed. The request | ||
| 570 | * can also not be queued any more, as it has been marked as | ||
| 571 | * transmitting and later transmitted. Thus no need to remove it from | ||
| 572 | * anywhere. | ||
| 573 | */ | ||
| 574 | |||
| 575 | ssh_rtl_complete_with_rsp(r, command, command_data); | ||
| 576 | ssh_request_put(r); | ||
| 577 | |||
| 578 | ssh_rtl_tx_schedule(rtl); | ||
| 579 | } | ||
| 580 | |||
| 581 | static bool ssh_rtl_cancel_nonpending(struct ssh_request *r) | ||
| 582 | { | ||
| 583 | struct ssh_rtl *rtl; | ||
| 584 | unsigned long flags, fixed; | ||
| 585 | bool remove; | ||
| 586 | |||
| 587 | /* | ||
| 588 | * Handle unsubmitted request: Try to mark the packet as locked, | ||
| 589 | * expecting the state to be zero (i.e. unsubmitted). Note that, if | ||
| 590 | * setting the state worked, we might still be adding the packet to the | ||
| 591 | * queue in a currently executing submit call. In that case, however, | ||
| 592 | * ptl reference must have been set previously, as locked is checked | ||
| 593 | * after setting ptl. Furthermore, when the ptl reference is set, the | ||
| 594 | * submission process is guaranteed to have entered the critical | ||
| 595 | * section. Thus only if we successfully locked this request and ptl is | ||
| 596 | * NULL, we have successfully removed the request, i.e. we are | ||
| 597 | * guaranteed that, due to the "locked" check in ssh_rtl_submit(), the | ||
| 598 | * packet will never be added. Otherwise, we need to try and grab it | ||
| 599 | * from the queue, where we are now guaranteed that the packet is or has | ||
| 600 | * been due to the critical section. | ||
| 601 | * | ||
| 602 | * Note that if the cmpxchg() fails, we are guaranteed that ptl has | ||
| 603 | * been set and is non-NULL, as states can only be nonzero after this | ||
| 604 | * has been set. Also note that we need to fetch the static (type) | ||
| 605 | * flags to ensure that they don't cause the cmpxchg() to fail. | ||
| 606 | */ | ||
| 607 | fixed = READ_ONCE(r->state) & SSH_REQUEST_FLAGS_TY_MASK; | ||
| 608 | flags = cmpxchg(&r->state, fixed, SSH_REQUEST_SF_LOCKED_BIT); | ||
| 609 | |||
| 610 | /* | ||
| 611 | * Force correct ordering with regards to state and ptl reference access | ||
| 612 | * to safe-guard cancellation to concurrent submission against a | ||
| 613 | * lost-update problem. First try to exchange state, then also check | ||
| 614 | * ptl if that worked. This barrier is paired with the | ||
| 615 | * one in ssh_rtl_submit(). | ||
| 616 | */ | ||
| 617 | smp_mb__after_atomic(); | ||
| 618 | |||
| 619 | if (flags == fixed && !READ_ONCE(r->packet.ptl)) { | ||
| 620 | if (test_and_set_bit(SSH_REQUEST_SF_COMPLETED_BIT, &r->state)) | ||
| 621 | return true; | ||
| 622 | |||
| 623 | ssh_rtl_complete_with_status(r, -ECANCELED); | ||
| 624 | return true; | ||
| 625 | } | ||
| 626 | |||
| 627 | rtl = ssh_request_rtl(r); | ||
| 628 | spin_lock(&rtl->queue.lock); | ||
| 629 | |||
| 630 | /* | ||
| 631 | * Note: 1) Requests cannot be re-submitted. 2) If a request is | ||
| 632 | * queued, it cannot be "transmitting"/"pending" yet. Thus, if we | ||
| 633 | * successfully remove the request here, we have removed all its | ||
| 634 | * occurrences in the system. | ||
| 635 | */ | ||
| 636 | |||
| 637 | remove = test_and_clear_bit(SSH_REQUEST_SF_QUEUED_BIT, &r->state); | ||
| 638 | if (!remove) { | ||
| 639 | spin_unlock(&rtl->queue.lock); | ||
| 640 | return false; | ||
| 641 | } | ||
| 642 | |||
| 643 | set_bit(SSH_REQUEST_SF_LOCKED_BIT, &r->state); | ||
| 644 | list_del(&r->node); | ||
| 645 | |||
| 646 | spin_unlock(&rtl->queue.lock); | ||
| 647 | |||
| 648 | ssh_request_put(r); /* Drop reference obtained from queue. */ | ||
| 649 | |||
| 650 | if (test_and_set_bit(SSH_REQUEST_SF_COMPLETED_BIT, &r->state)) | ||
| 651 | return true; | ||
| 652 | |||
| 653 | ssh_rtl_complete_with_status(r, -ECANCELED); | ||
| 654 | return true; | ||
| 655 | } | ||
| 656 | |||
| 657 | static bool ssh_rtl_cancel_pending(struct ssh_request *r) | ||
| 658 | { | ||
| 659 | /* If the packet is already locked, it's going to be removed shortly. */ | ||
| 660 | if (test_and_set_bit(SSH_REQUEST_SF_LOCKED_BIT, &r->state)) | ||
| 661 | return true; | ||
| 662 | |||
| 663 | /* | ||
| 664 | * Now that we have locked the packet, we have guaranteed that it can't | ||
| 665 | * be added to the system any more. If ptl is NULL, the locked | ||
| 666 | * check in ssh_rtl_submit() has not been run and any submission, | ||
| 667 | * currently in progress or called later, won't add the packet. Thus we | ||
| 668 | * can directly complete it. | ||
| 669 | * | ||
| 670 | * The implicit memory barrier of test_and_set_bit() should be enough | ||
| 671 | * to ensure that the correct order (first lock, then check ptl) is | ||
| 672 | * ensured. This is paired with the barrier in ssh_rtl_submit(). | ||
| 673 | */ | ||
| 674 | if (!READ_ONCE(r->packet.ptl)) { | ||
| 675 | if (test_and_set_bit(SSH_REQUEST_SF_COMPLETED_BIT, &r->state)) | ||
| 676 | return true; | ||
| 677 | |||
| 678 | ssh_rtl_complete_with_status(r, -ECANCELED); | ||
| 679 | return true; | ||
| 680 | } | ||
| 681 | |||
| 682 | /* | ||
| 683 | * Try to cancel the packet. If the packet has not been completed yet, | ||
| 684 | * this will subsequently (and synchronously) call the completion | ||
| 685 | * callback of the packet, which will complete the request. | ||
| 686 | */ | ||
| 687 | ssh_ptl_cancel(&r->packet); | ||
| 688 | |||
| 689 | /* | ||
| 690 | * If the packet has been completed with success, i.e. has not been | ||
| 691 | * canceled by the above call, the request may not have been completed | ||
| 692 | * yet (may be waiting for a response). Check if we need to do this | ||
| 693 | * here. | ||
| 694 | */ | ||
| 695 | if (test_and_set_bit(SSH_REQUEST_SF_COMPLETED_BIT, &r->state)) | ||
| 696 | return true; | ||
| 697 | |||
| 698 | ssh_rtl_queue_remove(r); | ||
| 699 | ssh_rtl_pending_remove(r); | ||
| 700 | ssh_rtl_complete_with_status(r, -ECANCELED); | ||
| 701 | |||
| 702 | return true; | ||
| 703 | } | ||
| 704 | |||
| 705 | /** | ||
| 706 | * ssh_rtl_cancel() - Cancel request. | ||
| 707 | * @rqst: The request to cancel. | ||
| 708 | * @pending: Whether to also cancel pending requests. | ||
| 709 | * | ||
| 710 | * Cancels the given request. If @pending is %false, this will not cancel | ||
| 711 | * pending requests, i.e. requests that have already been submitted to the | ||
| 712 | * packet layer but not been completed yet. If @pending is %true, this will | ||
| 713 | * cancel the given request regardless of the state it is in. | ||
| 714 | * | ||
| 715 | * If the request has been canceled by calling this function, both completion | ||
| 716 | * and release callbacks of the request will be executed in a reasonable | ||
| 717 | * time-frame. This may happen during execution of this function, however, | ||
| 718 | * there is no guarantee for this. For example, a request currently | ||
| 719 | * transmitting will be canceled/completed only after transmission has | ||
| 720 | * completed, and the respective callbacks will be executed on the transmitter | ||
| 721 | * thread, which may happen during, but also some time after execution of the | ||
| 722 | * cancel function. | ||
| 723 | * | ||
| 724 | * Return: Returns %true if the given request has been canceled or completed, | ||
| 725 | * either by this function or prior to calling this function, %false | ||
| 726 | * otherwise. If @pending is %true, this function will always return %true. | ||
| 727 | */ | ||
| 728 | bool ssh_rtl_cancel(struct ssh_request *rqst, bool pending) | ||
| 729 | { | ||
| 730 | struct ssh_rtl *rtl; | ||
| 731 | bool canceled; | ||
| 732 | |||
| 733 | if (test_and_set_bit(SSH_REQUEST_SF_CANCELED_BIT, &rqst->state)) | ||
| 734 | return true; | ||
| 735 | |||
| 736 | trace_ssam_request_cancel(rqst); | ||
| 737 | |||
| 738 | if (pending) | ||
| 739 | canceled = ssh_rtl_cancel_pending(rqst); | ||
| 740 | else | ||
| 741 | canceled = ssh_rtl_cancel_nonpending(rqst); | ||
| 742 | |||
| 743 | /* Note: rtl may be NULL if request has not been submitted yet. */ | ||
| 744 | rtl = ssh_request_rtl(rqst); | ||
| 745 | if (canceled && rtl) | ||
| 746 | ssh_rtl_tx_schedule(rtl); | ||
| 747 | |||
| 748 | return canceled; | ||
| 749 | } | ||
| 750 | |||
| 751 | static void ssh_rtl_packet_callback(struct ssh_packet *p, int status) | ||
| 752 | { | ||
| 753 | struct ssh_request *r = to_ssh_request(p); | ||
| 754 | |||
| 755 | if (unlikely(status)) { | ||
| 756 | set_bit(SSH_REQUEST_SF_LOCKED_BIT, &r->state); | ||
| 757 | |||
| 758 | if (test_and_set_bit(SSH_REQUEST_SF_COMPLETED_BIT, &r->state)) | ||
| 759 | return; | ||
| 760 | |||
| 761 | /* | ||
| 762 | * The packet may get canceled even though it has not been | ||
| 763 | * submitted yet. The request may still be queued. Check the | ||
| 764 | * queue and remove it if necessary. As the timeout would have | ||
| 765 | * been started in this function on success, there's no need | ||
| 766 | * to cancel it here. | ||
| 767 | */ | ||
| 768 | ssh_rtl_queue_remove(r); | ||
| 769 | ssh_rtl_pending_remove(r); | ||
| 770 | ssh_rtl_complete_with_status(r, status); | ||
| 771 | |||
| 772 | ssh_rtl_tx_schedule(ssh_request_rtl(r)); | ||
| 773 | return; | ||
| 774 | } | ||
| 775 | |||
| 776 | /* Update state: Mark as transmitted and clear transmitting. */ | ||
| 777 | set_bit(SSH_REQUEST_SF_TRANSMITTED_BIT, &r->state); | ||
| 778 | /* Ensure state never gets zero. */ | ||
| 779 | smp_mb__before_atomic(); | ||
| 780 | clear_bit(SSH_REQUEST_SF_TRANSMITTING_BIT, &r->state); | ||
| 781 | |||
| 782 | /* If we expect a response, we just need to start the timeout. */ | ||
| 783 | if (test_bit(SSH_REQUEST_TY_HAS_RESPONSE_BIT, &r->state)) { | ||
| 784 | /* | ||
| 785 | * Note: This is the only place where the timestamp gets set, | ||
| 786 | * all other access to it is read-only. | ||
| 787 | */ | ||
| 788 | ssh_rtl_timeout_start(r); | ||
| 789 | return; | ||
| 790 | } | ||
| 791 | |||
| 792 | /* | ||
| 793 | * If we don't expect a response, lock, remove, and complete the | ||
| 794 | * request. Note that, at this point, the request is guaranteed to have | ||
| 795 | * left the queue and no timeout has been started. Thus we only need to | ||
| 796 | * remove it from pending. If the request has already been completed (it | ||
| 797 | * may have been canceled) return. | ||
| 798 | */ | ||
| 799 | |||
| 800 | set_bit(SSH_REQUEST_SF_LOCKED_BIT, &r->state); | ||
| 801 | if (test_and_set_bit(SSH_REQUEST_SF_COMPLETED_BIT, &r->state)) | ||
| 802 | return; | ||
| 803 | |||
| 804 | ssh_rtl_pending_remove(r); | ||
| 805 | ssh_rtl_complete_with_status(r, 0); | ||
| 806 | |||
| 807 | ssh_rtl_tx_schedule(ssh_request_rtl(r)); | ||
| 808 | } | ||
| 809 | |||
| 810 | static ktime_t ssh_request_get_expiration(struct ssh_request *r, ktime_t timeout) | ||
| 811 | { | ||
| 812 | ktime_t timestamp = READ_ONCE(r->timestamp); | ||
| 813 | |||
| 814 | if (timestamp != KTIME_MAX) | ||
| 815 | return ktime_add(timestamp, timeout); | ||
| 816 | else | ||
| 817 | return KTIME_MAX; | ||
| 818 | } | ||
| 819 | |||
| 820 | static void ssh_rtl_timeout_reap(struct work_struct *work) | ||
| 821 | { | ||
| 822 | struct ssh_rtl *rtl = to_ssh_rtl(work, rtx_timeout.reaper.work); | ||
| 823 | struct ssh_request *r, *n; | ||
| 824 | LIST_HEAD(claimed); | ||
| 825 | ktime_t now = ktime_get_coarse_boottime(); | ||
| 826 | ktime_t timeout = rtl->rtx_timeout.timeout; | ||
| 827 | ktime_t next = KTIME_MAX; | ||
| 828 | |||
| 829 | trace_ssam_rtl_timeout_reap(atomic_read(&rtl->pending.count)); | ||
| 830 | |||
| 831 | /* | ||
| 832 | * Mark reaper as "not pending". This is done before checking any | ||
| 833 | * requests to avoid lost-update type problems. | ||
| 834 | */ | ||
| 835 | spin_lock(&rtl->rtx_timeout.lock); | ||
| 836 | rtl->rtx_timeout.expires = KTIME_MAX; | ||
| 837 | spin_unlock(&rtl->rtx_timeout.lock); | ||
| 838 | |||
| 839 | spin_lock(&rtl->pending.lock); | ||
| 840 | list_for_each_entry_safe(r, n, &rtl->pending.head, node) { | ||
| 841 | ktime_t expires = ssh_request_get_expiration(r, timeout); | ||
| 842 | |||
| 843 | /* | ||
| 844 | * Check if the timeout hasn't expired yet. Find out next | ||
| 845 | * expiration date to be handled after this run. | ||
| 846 | */ | ||
| 847 | if (ktime_after(expires, now)) { | ||
| 848 | next = ktime_before(expires, next) ? expires : next; | ||
| 849 | continue; | ||
| 850 | } | ||
| 851 | |||
| 852 | /* Avoid further transitions if locked. */ | ||
| 853 | if (test_and_set_bit(SSH_REQUEST_SF_LOCKED_BIT, &r->state)) | ||
| 854 | continue; | ||
| 855 | |||
| 856 | /* | ||
| 857 | * We have now marked the packet as locked. Thus it cannot be | ||
| 858 | * added to the pending or queued lists again after we've | ||
| 859 | * removed it here. We can therefore re-use the node of this | ||
| 860 | * packet temporarily. | ||
| 861 | */ | ||
| 862 | |||
| 863 | clear_bit(SSH_REQUEST_SF_PENDING_BIT, &r->state); | ||
| 864 | |||
| 865 | atomic_dec(&rtl->pending.count); | ||
| 866 | list_del(&r->node); | ||
| 867 | |||
| 868 | list_add_tail(&r->node, &claimed); | ||
| 869 | } | ||
| 870 | spin_unlock(&rtl->pending.lock); | ||
| 871 | |||
| 872 | /* Cancel and complete the request. */ | ||
| 873 | list_for_each_entry_safe(r, n, &claimed, node) { | ||
| 874 | trace_ssam_request_timeout(r); | ||
| 875 | |||
| 876 | /* | ||
| 877 | * At this point we've removed the packet from pending. This | ||
| 878 | * means that we've obtained the last (only) reference of the | ||
| 879 | * system to it. Thus we can just complete it. | ||
| 880 | */ | ||
| 881 | if (!test_and_set_bit(SSH_REQUEST_SF_COMPLETED_BIT, &r->state)) | ||
| 882 | ssh_rtl_complete_with_status(r, -ETIMEDOUT); | ||
| 883 | |||
| 884 | /* | ||
| 885 | * Drop the reference we've obtained by removing it from the | ||
| 886 | * pending set. | ||
| 887 | */ | ||
| 888 | list_del(&r->node); | ||
| 889 | ssh_request_put(r); | ||
| 890 | } | ||
| 891 | |||
| 892 | /* Ensure that the reaper doesn't run again immediately. */ | ||
| 893 | next = max(next, ktime_add(now, SSH_RTL_REQUEST_TIMEOUT_RESOLUTION)); | ||
| 894 | if (next != KTIME_MAX) | ||
| 895 | ssh_rtl_timeout_reaper_mod(rtl, now, next); | ||
| 896 | |||
| 897 | ssh_rtl_tx_schedule(rtl); | ||
| 898 | } | ||
| 899 | |||
| 900 | static void ssh_rtl_rx_event(struct ssh_rtl *rtl, const struct ssh_command *cmd, | ||
| 901 | const struct ssam_span *data) | ||
| 902 | { | ||
| 903 | trace_ssam_rx_event_received(cmd, data->len); | ||
| 904 | |||
| 905 | rtl_dbg(rtl, "rtl: handling event (rqid: %#06x)\n", | ||
| 906 | get_unaligned_le16(&cmd->rqid)); | ||
| 907 | |||
| 908 | rtl->ops.handle_event(rtl, cmd, data); | ||
| 909 | } | ||
| 910 | |||
| 911 | static void ssh_rtl_rx_command(struct ssh_ptl *p, const struct ssam_span *data) | ||
| 912 | { | ||
| 913 | struct ssh_rtl *rtl = to_ssh_rtl(p, ptl); | ||
| 914 | struct device *dev = &p->serdev->dev; | ||
| 915 | struct ssh_command *command; | ||
| 916 | struct ssam_span command_data; | ||
| 917 | |||
| 918 | if (sshp_parse_command(dev, data, &command, &command_data)) | ||
| 919 | return; | ||
| 920 | |||
| 921 | if (ssh_rqid_is_event(get_unaligned_le16(&command->rqid))) | ||
| 922 | ssh_rtl_rx_event(rtl, command, &command_data); | ||
| 923 | else | ||
| 924 | ssh_rtl_complete(rtl, command, &command_data); | ||
| 925 | } | ||
| 926 | |||
| 927 | static void ssh_rtl_rx_data(struct ssh_ptl *p, const struct ssam_span *data) | ||
| 928 | { | ||
| 929 | if (!data->len) { | ||
| 930 | ptl_err(p, "rtl: rx: no data frame payload\n"); | ||
| 931 | return; | ||
| 932 | } | ||
| 933 | |||
| 934 | switch (data->ptr[0]) { | ||
| 935 | case SSH_PLD_TYPE_CMD: | ||
| 936 | ssh_rtl_rx_command(p, data); | ||
| 937 | break; | ||
| 938 | |||
| 939 | default: | ||
| 940 | ptl_err(p, "rtl: rx: unknown frame payload type (type: %#04x)\n", | ||
| 941 | data->ptr[0]); | ||
| 942 | break; | ||
| 943 | } | ||
| 944 | } | ||
| 945 | |||
| 946 | static void ssh_rtl_packet_release(struct ssh_packet *p) | ||
| 947 | { | ||
| 948 | struct ssh_request *rqst; | ||
| 949 | |||
| 950 | rqst = to_ssh_request(p); | ||
| 951 | rqst->ops->release(rqst); | ||
| 952 | } | ||
| 953 | |||
| 954 | static const struct ssh_packet_ops ssh_rtl_packet_ops = { | ||
| 955 | .complete = ssh_rtl_packet_callback, | ||
| 956 | .release = ssh_rtl_packet_release, | ||
| 957 | }; | ||
| 958 | |||
| 959 | /** | ||
| 960 | * ssh_request_init() - Initialize SSH request. | ||
| 961 | * @rqst: The request to initialize. | ||
| 962 | * @flags: Request flags, determining the type of the request. | ||
| 963 | * @ops: Request operations. | ||
| 964 | * | ||
| 965 | * Initializes the given SSH request and underlying packet. Sets the message | ||
| 966 | * buffer pointer to %NULL and the message buffer length to zero. This buffer | ||
| 967 | * has to be set separately via ssh_request_set_data() before submission and | ||
| 968 | * must contain a valid SSH request message. | ||
| 969 | * | ||
| 970 | * Return: Returns zero on success or %-EINVAL if the given flags are invalid. | ||
| 971 | */ | ||
| 972 | int ssh_request_init(struct ssh_request *rqst, enum ssam_request_flags flags, | ||
| 973 | const struct ssh_request_ops *ops) | ||
| 974 | { | ||
| 975 | unsigned long type = BIT(SSH_PACKET_TY_BLOCKING_BIT); | ||
| 976 | |||
| 977 | /* Unsequenced requests cannot have a response. */ | ||
| 978 | if (flags & SSAM_REQUEST_UNSEQUENCED && flags & SSAM_REQUEST_HAS_RESPONSE) | ||
| 979 | return -EINVAL; | ||
| 980 | |||
| 981 | if (!(flags & SSAM_REQUEST_UNSEQUENCED)) | ||
| 982 | type |= BIT(SSH_PACKET_TY_SEQUENCED_BIT); | ||
| 983 | |||
| 984 | ssh_packet_init(&rqst->packet, type, SSH_PACKET_PRIORITY(DATA, 0), | ||
| 985 | &ssh_rtl_packet_ops); | ||
| 986 | |||
| 987 | INIT_LIST_HEAD(&rqst->node); | ||
| 988 | |||
| 989 | rqst->state = 0; | ||
| 990 | if (flags & SSAM_REQUEST_HAS_RESPONSE) | ||
| 991 | rqst->state |= BIT(SSH_REQUEST_TY_HAS_RESPONSE_BIT); | ||
| 992 | |||
| 993 | rqst->timestamp = KTIME_MAX; | ||
| 994 | rqst->ops = ops; | ||
| 995 | |||
| 996 | return 0; | ||
| 997 | } | ||
| 998 | |||
| 999 | /** | ||
| 1000 | * ssh_rtl_init() - Initialize request transport layer. | ||
| 1001 | * @rtl: The request transport layer to initialize. | ||
| 1002 | * @serdev: The underlying serial device, i.e. the lower-level transport. | ||
| 1003 | * @ops: Request transport layer operations. | ||
| 1004 | * | ||
| 1005 | * Initializes the given request transport layer and associated packet | ||
| 1006 | * transport layer. Transmitter and receiver threads must be started | ||
| 1007 | * separately via ssh_rtl_start(), after the request-layer has been | ||
| 1008 | * initialized and the lower-level serial device layer has been set up. | ||
| 1009 | * | ||
| 1010 | * Return: Returns zero on success and a nonzero error code on failure. | ||
| 1011 | */ | ||
| 1012 | int ssh_rtl_init(struct ssh_rtl *rtl, struct serdev_device *serdev, | ||
| 1013 | const struct ssh_rtl_ops *ops) | ||
| 1014 | { | ||
| 1015 | struct ssh_ptl_ops ptl_ops; | ||
| 1016 | int status; | ||
| 1017 | |||
| 1018 | ptl_ops.data_received = ssh_rtl_rx_data; | ||
| 1019 | |||
| 1020 | status = ssh_ptl_init(&rtl->ptl, serdev, &ptl_ops); | ||
| 1021 | if (status) | ||
| 1022 | return status; | ||
| 1023 | |||
| 1024 | spin_lock_init(&rtl->queue.lock); | ||
| 1025 | INIT_LIST_HEAD(&rtl->queue.head); | ||
| 1026 | |||
| 1027 | spin_lock_init(&rtl->pending.lock); | ||
| 1028 | INIT_LIST_HEAD(&rtl->pending.head); | ||
| 1029 | atomic_set_release(&rtl->pending.count, 0); | ||
| 1030 | |||
| 1031 | INIT_WORK(&rtl->tx.work, ssh_rtl_tx_work_fn); | ||
| 1032 | |||
| 1033 | spin_lock_init(&rtl->rtx_timeout.lock); | ||
| 1034 | rtl->rtx_timeout.timeout = SSH_RTL_REQUEST_TIMEOUT; | ||
| 1035 | rtl->rtx_timeout.expires = KTIME_MAX; | ||
| 1036 | INIT_DELAYED_WORK(&rtl->rtx_timeout.reaper, ssh_rtl_timeout_reap); | ||
| 1037 | |||
| 1038 | rtl->ops = *ops; | ||
| 1039 | |||
| 1040 | return 0; | ||
| 1041 | } | ||
| 1042 | |||
| 1043 | /** | ||
| 1044 | * ssh_rtl_destroy() - Deinitialize request transport layer. | ||
| 1045 | * @rtl: The request transport layer to deinitialize. | ||
| 1046 | * | ||
| 1047 | * Deinitializes the given request transport layer and frees resources | ||
| 1048 | * associated with it. If receiver and/or transmitter threads have been | ||
| 1049 | * started, the layer must first be shut down via ssh_rtl_shutdown() before | ||
| 1050 | * this function can be called. | ||
| 1051 | */ | ||
| 1052 | void ssh_rtl_destroy(struct ssh_rtl *rtl) | ||
| 1053 | { | ||
| 1054 | ssh_ptl_destroy(&rtl->ptl); | ||
| 1055 | } | ||
| 1056 | |||
| 1057 | /** | ||
| 1058 | * ssh_rtl_start() - Start request transmitter and receiver. | ||
| 1059 | * @rtl: The request transport layer. | ||
| 1060 | * | ||
| 1061 | * Return: Returns zero on success, a negative error code on failure. | ||
| 1062 | */ | ||
| 1063 | int ssh_rtl_start(struct ssh_rtl *rtl) | ||
| 1064 | { | ||
| 1065 | int status; | ||
| 1066 | |||
| 1067 | status = ssh_ptl_tx_start(&rtl->ptl); | ||
| 1068 | if (status) | ||
| 1069 | return status; | ||
| 1070 | |||
| 1071 | ssh_rtl_tx_schedule(rtl); | ||
| 1072 | |||
| 1073 | status = ssh_ptl_rx_start(&rtl->ptl); | ||
| 1074 | if (status) { | ||
| 1075 | ssh_rtl_flush(rtl, msecs_to_jiffies(5000)); | ||
| 1076 | ssh_ptl_tx_stop(&rtl->ptl); | ||
| 1077 | return status; | ||
| 1078 | } | ||
| 1079 | |||
| 1080 | return 0; | ||
| 1081 | } | ||
| 1082 | |||
| 1083 | struct ssh_flush_request { | ||
| 1084 | struct ssh_request base; | ||
| 1085 | struct completion completion; | ||
| 1086 | int status; | ||
| 1087 | }; | ||
| 1088 | |||
| 1089 | static void ssh_rtl_flush_request_complete(struct ssh_request *r, | ||
| 1090 | const struct ssh_command *cmd, | ||
| 1091 | const struct ssam_span *data, | ||
| 1092 | int status) | ||
| 1093 | { | ||
| 1094 | struct ssh_flush_request *rqst; | ||
| 1095 | |||
| 1096 | rqst = container_of(r, struct ssh_flush_request, base); | ||
| 1097 | rqst->status = status; | ||
| 1098 | } | ||
| 1099 | |||
| 1100 | static void ssh_rtl_flush_request_release(struct ssh_request *r) | ||
| 1101 | { | ||
| 1102 | struct ssh_flush_request *rqst; | ||
| 1103 | |||
| 1104 | rqst = container_of(r, struct ssh_flush_request, base); | ||
| 1105 | complete_all(&rqst->completion); | ||
| 1106 | } | ||
| 1107 | |||
| 1108 | static const struct ssh_request_ops ssh_rtl_flush_request_ops = { | ||
| 1109 | .complete = ssh_rtl_flush_request_complete, | ||
| 1110 | .release = ssh_rtl_flush_request_release, | ||
| 1111 | }; | ||
| 1112 | |||
| 1113 | /** | ||
| 1114 | * ssh_rtl_flush() - Flush the request transport layer. | ||
| 1115 | * @rtl: request transport layer | ||
| 1116 | * @timeout: timeout for the flush operation in jiffies | ||
| 1117 | * | ||
| 1118 | * Queue a special flush request and wait for its completion. This request | ||
| 1119 | * will be completed after all other currently queued and pending requests | ||
| 1120 | * have been completed. Instead of a normal data packet, this request submits | ||
| 1121 | * a special flush packet, meaning that upon completion, also the underlying | ||
| 1122 | * packet transport layer has been flushed. | ||
| 1123 | * | ||
| 1124 | * Flushing the request layer guarantees that all previously submitted | ||
| 1125 | * requests have been fully completed before this call returns. Additionally, | ||
| 1126 | * flushing blocks execution of all later submitted requests until the flush | ||
| 1127 | * has been completed. | ||
| 1128 | * | ||
| 1129 | * If the caller ensures that no new requests are submitted after a call to | ||
| 1130 | * this function, the request transport layer is guaranteed to have no | ||
| 1131 | * remaining requests when this call returns. The same guarantee does not hold | ||
| 1132 | * for the packet layer, on which control packets may still be queued after | ||
| 1133 | * this call. | ||
| 1134 | * | ||
| 1135 | * Return: Returns zero on success, %-ETIMEDOUT if the flush timed out and has | ||
| 1136 | * been canceled as a result of the timeout, or %-ESHUTDOWN if the packet | ||
| 1137 | * and/or request transport layer has been shut down before this call. May | ||
| 1138 | * also return %-EINTR if the underlying packet transmission has been | ||
| 1139 | * interrupted. | ||
| 1140 | */ | ||
| 1141 | int ssh_rtl_flush(struct ssh_rtl *rtl, unsigned long timeout) | ||
| 1142 | { | ||
| 1143 | const unsigned int init_flags = SSAM_REQUEST_UNSEQUENCED; | ||
| 1144 | struct ssh_flush_request rqst; | ||
| 1145 | int status; | ||
| 1146 | |||
| 1147 | ssh_request_init(&rqst.base, init_flags, &ssh_rtl_flush_request_ops); | ||
| 1148 | rqst.base.packet.state |= BIT(SSH_PACKET_TY_FLUSH_BIT); | ||
| 1149 | rqst.base.packet.priority = SSH_PACKET_PRIORITY(FLUSH, 0); | ||
| 1150 | rqst.base.state |= BIT(SSH_REQUEST_TY_FLUSH_BIT); | ||
| 1151 | |||
| 1152 | init_completion(&rqst.completion); | ||
| 1153 | |||
| 1154 | status = ssh_rtl_submit(rtl, &rqst.base); | ||
| 1155 | if (status) | ||
| 1156 | return status; | ||
| 1157 | |||
| 1158 | ssh_request_put(&rqst.base); | ||
| 1159 | |||
| 1160 | if (!wait_for_completion_timeout(&rqst.completion, timeout)) { | ||
| 1161 | ssh_rtl_cancel(&rqst.base, true); | ||
| 1162 | wait_for_completion(&rqst.completion); | ||
| 1163 | } | ||
| 1164 | |||
| 1165 | WARN_ON(rqst.status != 0 && rqst.status != -ECANCELED && | ||
| 1166 | rqst.status != -ESHUTDOWN && rqst.status != -EINTR); | ||
| 1167 | |||
| 1168 | return rqst.status == -ECANCELED ? -ETIMEDOUT : rqst.status; | ||
| 1169 | } | ||
| 1170 | |||
| 1171 | /** | ||
| 1172 | * ssh_rtl_shutdown() - Shut down request transport layer. | ||
| 1173 | * @rtl: The request transport layer. | ||
| 1174 | * | ||
| 1175 | * Shuts down the request transport layer, removing and canceling all queued | ||
| 1176 | * and pending requests. Requests canceled by this operation will be completed | ||
| 1177 | * with %-ESHUTDOWN as status. Receiver and transmitter threads will be | ||
| 1178 | * stopped, the lower-level packet layer will be shutdown. | ||
| 1179 | * | ||
| 1180 | * As a result of this function, the transport layer will be marked as shut | ||
| 1181 | * down. Submission of requests after the transport layer has been shut down | ||
| 1182 | * will fail with %-ESHUTDOWN. | ||
| 1183 | */ | ||
| 1184 | void ssh_rtl_shutdown(struct ssh_rtl *rtl) | ||
| 1185 | { | ||
| 1186 | struct ssh_request *r, *n; | ||
| 1187 | LIST_HEAD(claimed); | ||
| 1188 | int pending; | ||
| 1189 | |||
| 1190 | set_bit(SSH_RTL_SF_SHUTDOWN_BIT, &rtl->state); | ||
| 1191 | /* | ||
| 1192 | * Ensure that the layer gets marked as shut-down before actually | ||
| 1193 | * stopping it. In combination with the check in ssh_rtl_submit(), | ||
| 1194 | * this guarantees that no new requests can be added and all already | ||
| 1195 | * queued requests are properly canceled. | ||
| 1196 | */ | ||
| 1197 | smp_mb__after_atomic(); | ||
| 1198 | |||
| 1199 | /* Remove requests from queue. */ | ||
| 1200 | spin_lock(&rtl->queue.lock); | ||
| 1201 | list_for_each_entry_safe(r, n, &rtl->queue.head, node) { | ||
| 1202 | set_bit(SSH_REQUEST_SF_LOCKED_BIT, &r->state); | ||
| 1203 | /* Ensure state never gets zero. */ | ||
| 1204 | smp_mb__before_atomic(); | ||
| 1205 | clear_bit(SSH_REQUEST_SF_QUEUED_BIT, &r->state); | ||
| 1206 | |||
| 1207 | list_del(&r->node); | ||
| 1208 | list_add_tail(&r->node, &claimed); | ||
| 1209 | } | ||
| 1210 | spin_unlock(&rtl->queue.lock); | ||
| 1211 | |||
| 1212 | /* | ||
| 1213 | * We have now guaranteed that the queue is empty and no more new | ||
| 1214 | * requests can be submitted (i.e. it will stay empty). This means that | ||
| 1215 | * calling ssh_rtl_tx_schedule() will not schedule tx.work any more. So | ||
| 1216 | * we can simply call cancel_work_sync() on tx.work here and when that | ||
| 1217 | * returns, we've locked it down. This also means that after this call, | ||
| 1218 | * we don't submit any more packets to the underlying packet layer, so | ||
| 1219 | * we can also shut that down. | ||
| 1220 | */ | ||
| 1221 | |||
| 1222 | cancel_work_sync(&rtl->tx.work); | ||
| 1223 | ssh_ptl_shutdown(&rtl->ptl); | ||
| 1224 | cancel_delayed_work_sync(&rtl->rtx_timeout.reaper); | ||
| 1225 | |||
| 1226 | /* | ||
| 1227 | * Shutting down the packet layer should also have canceled all | ||
| 1228 | * requests. Thus the pending set should be empty. Attempt to handle | ||
| 1229 | * this gracefully anyways, even though this should be dead code. | ||
| 1230 | */ | ||
| 1231 | |||
| 1232 | pending = atomic_read(&rtl->pending.count); | ||
| 1233 | if (WARN_ON(pending)) { | ||
| 1234 | spin_lock(&rtl->pending.lock); | ||
| 1235 | list_for_each_entry_safe(r, n, &rtl->pending.head, node) { | ||
| 1236 | set_bit(SSH_REQUEST_SF_LOCKED_BIT, &r->state); | ||
| 1237 | /* Ensure state never gets zero. */ | ||
| 1238 | smp_mb__before_atomic(); | ||
| 1239 | clear_bit(SSH_REQUEST_SF_PENDING_BIT, &r->state); | ||
| 1240 | |||
| 1241 | list_del(&r->node); | ||
| 1242 | list_add_tail(&r->node, &claimed); | ||
| 1243 | } | ||
| 1244 | spin_unlock(&rtl->pending.lock); | ||
| 1245 | } | ||
| 1246 | |||
| 1247 | /* Finally, cancel and complete the requests we claimed before. */ | ||
| 1248 | list_for_each_entry_safe(r, n, &claimed, node) { | ||
| 1249 | /* | ||
| 1250 | * We need test_and_set() because we still might compete with | ||
| 1251 | * cancellation. | ||
| 1252 | */ | ||
| 1253 | if (!test_and_set_bit(SSH_REQUEST_SF_COMPLETED_BIT, &r->state)) | ||
| 1254 | ssh_rtl_complete_with_status(r, -ESHUTDOWN); | ||
| 1255 | |||
| 1256 | /* | ||
| 1257 | * Drop the reference we've obtained by removing it from the | ||
| 1258 | * lists. | ||
| 1259 | */ | ||
| 1260 | list_del(&r->node); | ||
| 1261 | ssh_request_put(r); | ||
| 1262 | } | ||
| 1263 | } | ||
| @@ -0,0 +1,143 @@ | |||
| 1 | /* SPDX-License-Identifier: GPL-2.0+ */ | ||
| 2 | /* | ||
| 3 | * SSH request transport layer. | ||
| 4 | * | ||
| 5 | * Copyright (C) 2019-2020 Maximilian Luz <luzmaximilian@gmail.com> | ||
| 6 | */ | ||
| 7 | |||
| 8 | #ifndef _SURFACE_AGGREGATOR_SSH_REQUEST_LAYER_H | ||
| 9 | #define _SURFACE_AGGREGATOR_SSH_REQUEST_LAYER_H | ||
| 10 | |||
| 11 | #include <linux/atomic.h> | ||
| 12 | #include <linux/ktime.h> | ||
| 13 | #include <linux/list.h> | ||
| 14 | #include <linux/spinlock.h> | ||
| 15 | #include <linux/workqueue.h> | ||
| 16 | |||
| 17 | #include <linux/surface_aggregator/serial_hub.h> | ||
| 18 | #include <linux/surface_aggregator/controller.h> | ||
| 19 | |||
| 20 | #include "ssh_packet_layer.h" | ||
| 21 | |||
| 22 | /** | ||
| 23 | * enum ssh_rtl_state_flags - State-flags for &struct ssh_rtl. | ||
| 24 | * | ||
| 25 | * @SSH_RTL_SF_SHUTDOWN_BIT: | ||
| 26 | * Indicates that the request transport layer has been shut down or is | ||
| 27 | * being shut down and should not accept any new requests. | ||
| 28 | */ | ||
| 29 | enum ssh_rtl_state_flags { | ||
| 30 | SSH_RTL_SF_SHUTDOWN_BIT, | ||
| 31 | }; | ||
| 32 | |||
| 33 | /** | ||
| 34 | * struct ssh_rtl_ops - Callback operations for request transport layer. | ||
| 35 | * @handle_event: Function called when a SSH event has been received. The | ||
| 36 | * specified function takes the request layer, received command | ||
| 37 | * struct, and corresponding payload as arguments. If the event | ||
| 38 | * has no payload, the payload span is empty (not %NULL). | ||
| 39 | */ | ||
| 40 | struct ssh_rtl_ops { | ||
| 41 | void (*handle_event)(struct ssh_rtl *rtl, const struct ssh_command *cmd, | ||
| 42 | const struct ssam_span *data); | ||
| 43 | }; | ||
| 44 | |||
| 45 | /** | ||
| 46 | * struct ssh_rtl - SSH request transport layer. | ||
| 47 | * @ptl: Underlying packet transport layer. | ||
| 48 | * @state: State(-flags) of the transport layer. | ||
| 49 | * @queue: Request submission queue. | ||
| 50 | * @queue.lock: Lock for modifying the request submission queue. | ||
| 51 | * @queue.head: List-head of the request submission queue. | ||
| 52 | * @pending: Set/list of pending requests. | ||
| 53 | * @pending.lock: Lock for modifying the request set. | ||
| 54 | * @pending.head: List-head of the pending set/list. | ||
| 55 | * @pending.count: Number of currently pending requests. | ||
| 56 | * @tx: Transmitter subsystem. | ||
| 57 | * @tx.work: Transmitter work item. | ||
| 58 | * @rtx_timeout: Retransmission timeout subsystem. | ||
| 59 | * @rtx_timeout.lock: Lock for modifying the retransmission timeout reaper. | ||
| 60 | * @rtx_timeout.timeout: Timeout interval for retransmission. | ||
| 61 | * @rtx_timeout.expires: Time specifying when the reaper work is next scheduled. | ||
| 62 | * @rtx_timeout.reaper: Work performing timeout checks and subsequent actions. | ||
| 63 | * @ops: Request layer operations. | ||
| 64 | */ | ||
| 65 | struct ssh_rtl { | ||
| 66 | struct ssh_ptl ptl; | ||
| 67 | unsigned long state; | ||
| 68 | |||
| 69 | struct { | ||
| 70 | spinlock_t lock; | ||
| 71 | struct list_head head; | ||
| 72 | } queue; | ||
| 73 | |||
| 74 | struct { | ||
| 75 | spinlock_t lock; | ||
| 76 | struct list_head head; | ||
| 77 | atomic_t count; | ||
| 78 | } pending; | ||
| 79 | |||
| 80 | struct { | ||
| 81 | struct work_struct work; | ||
| 82 | } tx; | ||
| 83 | |||
| 84 | struct { | ||
| 85 | spinlock_t lock; | ||
| 86 | ktime_t timeout; | ||
| 87 | ktime_t expires; | ||
| 88 | struct delayed_work reaper; | ||
| 89 | } rtx_timeout; | ||
| 90 | |||
| 91 | struct ssh_rtl_ops ops; | ||
| 92 | }; | ||
| 93 | |||
| 94 | #define rtl_dbg(r, fmt, ...) ptl_dbg(&(r)->ptl, fmt, ##__VA_ARGS__) | ||
| 95 | #define rtl_info(p, fmt, ...) ptl_info(&(p)->ptl, fmt, ##__VA_ARGS__) | ||
| 96 | #define rtl_warn(r, fmt, ...) ptl_warn(&(r)->ptl, fmt, ##__VA_ARGS__) | ||
| 97 | #define rtl_err(r, fmt, ...) ptl_err(&(r)->ptl, fmt, ##__VA_ARGS__) | ||
| 98 | #define rtl_dbg_cond(r, fmt, ...) __ssam_prcond(rtl_dbg, r, fmt, ##__VA_ARGS__) | ||
| 99 | |||
| 100 | #define to_ssh_rtl(ptr, member) \ | ||
| 101 | container_of(ptr, struct ssh_rtl, member) | ||
| 102 | |||
| 103 | /** | ||
| 104 | * ssh_rtl_get_device() - Get device associated with request transport layer. | ||
| 105 | * @rtl: The request transport layer. | ||
| 106 | * | ||
| 107 | * Return: Returns the device on which the given request transport layer | ||
| 108 | * builds upon. | ||
| 109 | */ | ||
| 110 | static inline struct device *ssh_rtl_get_device(struct ssh_rtl *rtl) | ||
| 111 | { | ||
| 112 | return ssh_ptl_get_device(&rtl->ptl); | ||
| 113 | } | ||
| 114 | |||
| 115 | /** | ||
| 116 | * ssh_request_rtl() - Get request transport layer associated with request. | ||
| 117 | * @rqst: The request to get the request transport layer reference for. | ||
| 118 | * | ||
| 119 | * Return: Returns the &struct ssh_rtl associated with the given SSH request. | ||
| 120 | */ | ||
| 121 | static inline struct ssh_rtl *ssh_request_rtl(struct ssh_request *rqst) | ||
| 122 | { | ||
| 123 | struct ssh_ptl *ptl; | ||
| 124 | |||
| 125 | ptl = READ_ONCE(rqst->packet.ptl); | ||
| 126 | return likely(ptl) ? to_ssh_rtl(ptl, ptl) : NULL; | ||
| 127 | } | ||
| 128 | |||
| 129 | int ssh_rtl_submit(struct ssh_rtl *rtl, struct ssh_request *rqst); | ||
| 130 | bool ssh_rtl_cancel(struct ssh_request *rqst, bool pending); | ||
| 131 | |||
| 132 | int ssh_rtl_init(struct ssh_rtl *rtl, struct serdev_device *serdev, | ||
| 133 | const struct ssh_rtl_ops *ops); | ||
| 134 | |||
| 135 | int ssh_rtl_start(struct ssh_rtl *rtl); | ||
| 136 | int ssh_rtl_flush(struct ssh_rtl *rtl, unsigned long timeout); | ||
| 137 | void ssh_rtl_shutdown(struct ssh_rtl *rtl); | ||
| 138 | void ssh_rtl_destroy(struct ssh_rtl *rtl); | ||
| 139 | |||
| 140 | int ssh_request_init(struct ssh_request *rqst, enum ssam_request_flags flags, | ||
| 141 | const struct ssh_request_ops *ops); | ||
| 142 | |||
| 143 | #endif /* _SURFACE_AGGREGATOR_SSH_REQUEST_LAYER_H */ | ||
| @@ -0,0 +1,632 @@ | |||
| 1 | /* SPDX-License-Identifier: GPL-2.0+ */ | ||
| 2 | /* | ||
| 3 | * Trace points for SSAM/SSH. | ||
| 4 | * | ||
| 5 | * Copyright (C) 2020 Maximilian Luz <luzmaximilian@gmail.com> | ||
| 6 | */ | ||
| 7 | |||
| 8 | #undef TRACE_SYSTEM | ||
| 9 | #define TRACE_SYSTEM surface_aggregator | ||
| 10 | |||
| 11 | #if !defined(_SURFACE_AGGREGATOR_TRACE_H) || defined(TRACE_HEADER_MULTI_READ) | ||
| 12 | #define _SURFACE_AGGREGATOR_TRACE_H | ||
| 13 | |||
| 14 | #include <linux/surface_aggregator/serial_hub.h> | ||
| 15 | |||
| 16 | #include <asm/unaligned.h> | ||
| 17 | #include <linux/tracepoint.h> | ||
| 18 | |||
| 19 | TRACE_DEFINE_ENUM(SSH_FRAME_TYPE_DATA_SEQ); | ||
| 20 | TRACE_DEFINE_ENUM(SSH_FRAME_TYPE_DATA_NSQ); | ||
| 21 | TRACE_DEFINE_ENUM(SSH_FRAME_TYPE_ACK); | ||
| 22 | TRACE_DEFINE_ENUM(SSH_FRAME_TYPE_NAK); | ||
| 23 | |||
| 24 | TRACE_DEFINE_ENUM(SSH_PACKET_SF_LOCKED_BIT); | ||
| 25 | TRACE_DEFINE_ENUM(SSH_PACKET_SF_QUEUED_BIT); | ||
| 26 | TRACE_DEFINE_ENUM(SSH_PACKET_SF_PENDING_BIT); | ||
| 27 | TRACE_DEFINE_ENUM(SSH_PACKET_SF_TRANSMITTING_BIT); | ||
| 28 | TRACE_DEFINE_ENUM(SSH_PACKET_SF_TRANSMITTED_BIT); | ||
| 29 | TRACE_DEFINE_ENUM(SSH_PACKET_SF_ACKED_BIT); | ||
| 30 | TRACE_DEFINE_ENUM(SSH_PACKET_SF_CANCELED_BIT); | ||
| 31 | TRACE_DEFINE_ENUM(SSH_PACKET_SF_COMPLETED_BIT); | ||
| 32 | |||
| 33 | TRACE_DEFINE_ENUM(SSH_PACKET_TY_FLUSH_BIT); | ||
| 34 | TRACE_DEFINE_ENUM(SSH_PACKET_TY_SEQUENCED_BIT); | ||
| 35 | TRACE_DEFINE_ENUM(SSH_PACKET_TY_BLOCKING_BIT); | ||
| 36 | |||
| 37 | TRACE_DEFINE_ENUM(SSH_PACKET_FLAGS_SF_MASK); | ||
| 38 | TRACE_DEFINE_ENUM(SSH_PACKET_FLAGS_TY_MASK); | ||
| 39 | |||
| 40 | TRACE_DEFINE_ENUM(SSH_REQUEST_SF_LOCKED_BIT); | ||
| 41 | TRACE_DEFINE_ENUM(SSH_REQUEST_SF_QUEUED_BIT); | ||
| 42 | TRACE_DEFINE_ENUM(SSH_REQUEST_SF_PENDING_BIT); | ||
| 43 | TRACE_DEFINE_ENUM(SSH_REQUEST_SF_TRANSMITTING_BIT); | ||
| 44 | TRACE_DEFINE_ENUM(SSH_REQUEST_SF_TRANSMITTED_BIT); | ||
| 45 | TRACE_DEFINE_ENUM(SSH_REQUEST_SF_RSPRCVD_BIT); | ||
| 46 | TRACE_DEFINE_ENUM(SSH_REQUEST_SF_CANCELED_BIT); | ||
| 47 | TRACE_DEFINE_ENUM(SSH_REQUEST_SF_COMPLETED_BIT); | ||
| 48 | |||
| 49 | TRACE_DEFINE_ENUM(SSH_REQUEST_TY_FLUSH_BIT); | ||
| 50 | TRACE_DEFINE_ENUM(SSH_REQUEST_TY_HAS_RESPONSE_BIT); | ||
| 51 | |||
| 52 | TRACE_DEFINE_ENUM(SSH_REQUEST_FLAGS_SF_MASK); | ||
| 53 | TRACE_DEFINE_ENUM(SSH_REQUEST_FLAGS_TY_MASK); | ||
| 54 | |||
| 55 | TRACE_DEFINE_ENUM(SSAM_SSH_TC_SAM); | ||
| 56 | TRACE_DEFINE_ENUM(SSAM_SSH_TC_BAT); | ||
| 57 | TRACE_DEFINE_ENUM(SSAM_SSH_TC_TMP); | ||
| 58 | TRACE_DEFINE_ENUM(SSAM_SSH_TC_PMC); | ||
| 59 | TRACE_DEFINE_ENUM(SSAM_SSH_TC_FAN); | ||
| 60 | TRACE_DEFINE_ENUM(SSAM_SSH_TC_PoM); | ||
| 61 | TRACE_DEFINE_ENUM(SSAM_SSH_TC_DBG); | ||
| 62 | TRACE_DEFINE_ENUM(SSAM_SSH_TC_KBD); | ||
| 63 | TRACE_DEFINE_ENUM(SSAM_SSH_TC_FWU); | ||
| 64 | TRACE_DEFINE_ENUM(SSAM_SSH_TC_UNI); | ||
| 65 | TRACE_DEFINE_ENUM(SSAM_SSH_TC_LPC); | ||
| 66 | TRACE_DEFINE_ENUM(SSAM_SSH_TC_TCL); | ||
| 67 | TRACE_DEFINE_ENUM(SSAM_SSH_TC_SFL); | ||
| 68 | TRACE_DEFINE_ENUM(SSAM_SSH_TC_KIP); | ||
| 69 | TRACE_DEFINE_ENUM(SSAM_SSH_TC_EXT); | ||
| 70 | TRACE_DEFINE_ENUM(SSAM_SSH_TC_BLD); | ||
| 71 | TRACE_DEFINE_ENUM(SSAM_SSH_TC_BAS); | ||
| 72 | TRACE_DEFINE_ENUM(SSAM_SSH_TC_SEN); | ||
| 73 | TRACE_DEFINE_ENUM(SSAM_SSH_TC_SRQ); | ||
| 74 | TRACE_DEFINE_ENUM(SSAM_SSH_TC_MCU); | ||
| 75 | TRACE_DEFINE_ENUM(SSAM_SSH_TC_HID); | ||
| 76 | TRACE_DEFINE_ENUM(SSAM_SSH_TC_TCH); | ||
| 77 | TRACE_DEFINE_ENUM(SSAM_SSH_TC_BKL); | ||
| 78 | TRACE_DEFINE_ENUM(SSAM_SSH_TC_TAM); | ||
| 79 | TRACE_DEFINE_ENUM(SSAM_SSH_TC_ACC); | ||
| 80 | TRACE_DEFINE_ENUM(SSAM_SSH_TC_UFI); | ||
| 81 | TRACE_DEFINE_ENUM(SSAM_SSH_TC_USC); | ||
| 82 | TRACE_DEFINE_ENUM(SSAM_SSH_TC_PEN); | ||
| 83 | TRACE_DEFINE_ENUM(SSAM_SSH_TC_VID); | ||
| 84 | TRACE_DEFINE_ENUM(SSAM_SSH_TC_AUD); | ||
| 85 | TRACE_DEFINE_ENUM(SSAM_SSH_TC_SMC); | ||
| 86 | TRACE_DEFINE_ENUM(SSAM_SSH_TC_KPD); | ||
| 87 | TRACE_DEFINE_ENUM(SSAM_SSH_TC_REG); | ||
| 88 | |||
| 89 | #define SSAM_PTR_UID_LEN 9 | ||
| 90 | #define SSAM_U8_FIELD_NOT_APPLICABLE ((u16)-1) | ||
| 91 | #define SSAM_SEQ_NOT_APPLICABLE ((u16)-1) | ||
| 92 | #define SSAM_RQID_NOT_APPLICABLE ((u32)-1) | ||
| 93 | #define SSAM_SSH_TC_NOT_APPLICABLE 0 | ||
| 94 | |||
| 95 | #ifndef _SURFACE_AGGREGATOR_TRACE_HELPERS | ||
| 96 | #define _SURFACE_AGGREGATOR_TRACE_HELPERS | ||
| 97 | |||
| 98 | /** | ||
| 99 | * ssam_trace_ptr_uid() - Convert the pointer to a non-pointer UID string. | ||
| 100 | * @ptr: The pointer to convert. | ||
| 101 | * @uid_str: A buffer of length SSAM_PTR_UID_LEN where the UID will be stored. | ||
| 102 | * | ||
| 103 | * Converts the given pointer into a UID string that is safe to be shared | ||
| 104 | * with userspace and logs, i.e. doesn't give away the real memory location. | ||
| 105 | */ | ||
| 106 | static inline void ssam_trace_ptr_uid(const void *ptr, char *uid_str) | ||
| 107 | { | ||
| 108 | char buf[2 * sizeof(void *) + 1]; | ||
| 109 | |||
| 110 | BUILD_BUG_ON(ARRAY_SIZE(buf) < SSAM_PTR_UID_LEN); | ||
| 111 | |||
| 112 | snprintf(buf, ARRAY_SIZE(buf), "%p", ptr); | ||
| 113 | memcpy(uid_str, &buf[ARRAY_SIZE(buf) - SSAM_PTR_UID_LEN], | ||
| 114 | SSAM_PTR_UID_LEN); | ||
| 115 | } | ||
| 116 | |||
| 117 | /** | ||
| 118 | * ssam_trace_get_packet_seq() - Read the packet's sequence ID. | ||
| 119 | * @p: The packet. | ||
| 120 | * | ||
| 121 | * Return: Returns the packet's sequence ID (SEQ) field if present, or | ||
| 122 | * %SSAM_SEQ_NOT_APPLICABLE if not (e.g. flush packet). | ||
| 123 | */ | ||
| 124 | static inline u16 ssam_trace_get_packet_seq(const struct ssh_packet *p) | ||
| 125 | { | ||
| 126 | if (!p->data.ptr || p->data.len < SSH_MESSAGE_LENGTH(0)) | ||
| 127 | return SSAM_SEQ_NOT_APPLICABLE; | ||
| 128 | |||
| 129 | return p->data.ptr[SSH_MSGOFFSET_FRAME(seq)]; | ||
| 130 | } | ||
| 131 | |||
| 132 | /** | ||
| 133 | * ssam_trace_get_request_id() - Read the packet's request ID. | ||
| 134 | * @p: The packet. | ||
| 135 | * | ||
| 136 | * Return: Returns the packet's request ID (RQID) field if the packet | ||
| 137 | * represents a request with command data, or %SSAM_RQID_NOT_APPLICABLE if not | ||
| 138 | * (e.g. flush request, control packet). | ||
| 139 | */ | ||
| 140 | static inline u32 ssam_trace_get_request_id(const struct ssh_packet *p) | ||
| 141 | { | ||
| 142 | if (!p->data.ptr || p->data.len < SSH_COMMAND_MESSAGE_LENGTH(0)) | ||
| 143 | return SSAM_RQID_NOT_APPLICABLE; | ||
| 144 | |||
| 145 | return get_unaligned_le16(&p->data.ptr[SSH_MSGOFFSET_COMMAND(rqid)]); | ||
| 146 | } | ||
| 147 | |||
| 148 | /** | ||
| 149 | * ssam_trace_get_request_tc() - Read the packet's request target category. | ||
| 150 | * @p: The packet. | ||
| 151 | * | ||
| 152 | * Return: Returns the packet's request target category (TC) field if the | ||
| 153 | * packet represents a request with command data, or %SSAM_TC_NOT_APPLICABLE | ||
| 154 | * if not (e.g. flush request, control packet). | ||
| 155 | */ | ||
| 156 | static inline u32 ssam_trace_get_request_tc(const struct ssh_packet *p) | ||
| 157 | { | ||
| 158 | if (!p->data.ptr || p->data.len < SSH_COMMAND_MESSAGE_LENGTH(0)) | ||
| 159 | return SSAM_SSH_TC_NOT_APPLICABLE; | ||
| 160 | |||
| 161 | return get_unaligned_le16(&p->data.ptr[SSH_MSGOFFSET_COMMAND(tc)]); | ||
| 162 | } | ||
| 163 | |||
| 164 | #endif /* _SURFACE_AGGREGATOR_TRACE_HELPERS */ | ||
| 165 | |||
| 166 | #define ssam_trace_get_command_field_u8(packet, field) \ | ||
| 167 | ((!(packet) || (packet)->data.len < SSH_COMMAND_MESSAGE_LENGTH(0)) \ | ||
| 168 | ? 0 : (packet)->data.ptr[SSH_MSGOFFSET_COMMAND(field)]) | ||
| 169 | |||
| 170 | #define ssam_show_generic_u8_field(value) \ | ||
| 171 | __print_symbolic(value, \ | ||
| 172 | { SSAM_U8_FIELD_NOT_APPLICABLE, "N/A" } \ | ||
| 173 | ) | ||
| 174 | |||
| 175 | #define ssam_show_frame_type(ty) \ | ||
| 176 | __print_symbolic(ty, \ | ||
| 177 | { SSH_FRAME_TYPE_DATA_SEQ, "DSEQ" }, \ | ||
| 178 | { SSH_FRAME_TYPE_DATA_NSQ, "DNSQ" }, \ | ||
| 179 | { SSH_FRAME_TYPE_ACK, "ACK" }, \ | ||
| 180 | { SSH_FRAME_TYPE_NAK, "NAK" } \ | ||
| 181 | ) | ||
| 182 | |||
| 183 | #define ssam_show_packet_type(type) \ | ||
| 184 | __print_flags(flags & SSH_PACKET_FLAGS_TY_MASK, "", \ | ||
| 185 | { BIT(SSH_PACKET_TY_FLUSH_BIT), "F" }, \ | ||
| 186 | { BIT(SSH_PACKET_TY_SEQUENCED_BIT), "S" }, \ | ||
| 187 | { BIT(SSH_PACKET_TY_BLOCKING_BIT), "B" } \ | ||
| 188 | ) | ||
| 189 | |||
| 190 | #define ssam_show_packet_state(state) \ | ||
| 191 | __print_flags(flags & SSH_PACKET_FLAGS_SF_MASK, "", \ | ||
| 192 | { BIT(SSH_PACKET_SF_LOCKED_BIT), "L" }, \ | ||
| 193 | { BIT(SSH_PACKET_SF_QUEUED_BIT), "Q" }, \ | ||
| 194 | { BIT(SSH_PACKET_SF_PENDING_BIT), "P" }, \ | ||
| 195 | { BIT(SSH_PACKET_SF_TRANSMITTING_BIT), "S" }, \ | ||
| 196 | { BIT(SSH_PACKET_SF_TRANSMITTED_BIT), "T" }, \ | ||
| 197 | { BIT(SSH_PACKET_SF_ACKED_BIT), "A" }, \ | ||
| 198 | { BIT(SSH_PACKET_SF_CANCELED_BIT), "C" }, \ | ||
| 199 | { BIT(SSH_PACKET_SF_COMPLETED_BIT), "F" } \ | ||
| 200 | ) | ||
| 201 | |||
| 202 | #define ssam_show_packet_seq(seq) \ | ||
| 203 | __print_symbolic(seq, \ | ||
| 204 | { SSAM_SEQ_NOT_APPLICABLE, "N/A" } \ | ||
| 205 | ) | ||
| 206 | |||
| 207 | #define ssam_show_request_type(flags) \ | ||
| 208 | __print_flags((flags) & SSH_REQUEST_FLAGS_TY_MASK, "", \ | ||
| 209 | { BIT(SSH_REQUEST_TY_FLUSH_BIT), "F" }, \ | ||
| 210 | { BIT(SSH_REQUEST_TY_HAS_RESPONSE_BIT), "R" } \ | ||
| 211 | ) | ||
| 212 | |||
| 213 | #define ssam_show_request_state(flags) \ | ||
| 214 | __print_flags((flags) & SSH_REQUEST_FLAGS_SF_MASK, "", \ | ||
| 215 | { BIT(SSH_REQUEST_SF_LOCKED_BIT), "L" }, \ | ||
| 216 | { BIT(SSH_REQUEST_SF_QUEUED_BIT), "Q" }, \ | ||
| 217 | { BIT(SSH_REQUEST_SF_PENDING_BIT), "P" }, \ | ||
| 218 | { BIT(SSH_REQUEST_SF_TRANSMITTING_BIT), "S" }, \ | ||
| 219 | { BIT(SSH_REQUEST_SF_TRANSMITTED_BIT), "T" }, \ | ||
| 220 | { BIT(SSH_REQUEST_SF_RSPRCVD_BIT), "A" }, \ | ||
| 221 | { BIT(SSH_REQUEST_SF_CANCELED_BIT), "C" }, \ | ||
| 222 | { BIT(SSH_REQUEST_SF_COMPLETED_BIT), "F" } \ | ||
| 223 | ) | ||
| 224 | |||
| 225 | #define ssam_show_request_id(rqid) \ | ||
| 226 | __print_symbolic(rqid, \ | ||
| 227 | { SSAM_RQID_NOT_APPLICABLE, "N/A" } \ | ||
| 228 | ) | ||
| 229 | |||
| 230 | #define ssam_show_ssh_tc(rqid) \ | ||
| 231 | __print_symbolic(rqid, \ | ||
| 232 | { SSAM_SSH_TC_NOT_APPLICABLE, "N/A" }, \ | ||
| 233 | { SSAM_SSH_TC_SAM, "SAM" }, \ | ||
| 234 | { SSAM_SSH_TC_BAT, "BAT" }, \ | ||
| 235 | { SSAM_SSH_TC_TMP, "TMP" }, \ | ||
| 236 | { SSAM_SSH_TC_PMC, "PMC" }, \ | ||
| 237 | { SSAM_SSH_TC_FAN, "FAN" }, \ | ||
| 238 | { SSAM_SSH_TC_PoM, "PoM" }, \ | ||
| 239 | { SSAM_SSH_TC_DBG, "DBG" }, \ | ||
| 240 | { SSAM_SSH_TC_KBD, "KBD" }, \ | ||
| 241 | { SSAM_SSH_TC_FWU, "FWU" }, \ | ||
| 242 | { SSAM_SSH_TC_UNI, "UNI" }, \ | ||
| 243 | { SSAM_SSH_TC_LPC, "LPC" }, \ | ||
| 244 | { SSAM_SSH_TC_TCL, "TCL" }, \ | ||
| 245 | { SSAM_SSH_TC_SFL, "SFL" }, \ | ||
| 246 | { SSAM_SSH_TC_KIP, "KIP" }, \ | ||
| 247 | { SSAM_SSH_TC_EXT, "EXT" }, \ | ||
| 248 | { SSAM_SSH_TC_BLD, "BLD" }, \ | ||
| 249 | { SSAM_SSH_TC_BAS, "BAS" }, \ | ||
| 250 | { SSAM_SSH_TC_SEN, "SEN" }, \ | ||
| 251 | { SSAM_SSH_TC_SRQ, "SRQ" }, \ | ||
| 252 | { SSAM_SSH_TC_MCU, "MCU" }, \ | ||
| 253 | { SSAM_SSH_TC_HID, "HID" }, \ | ||
| 254 | { SSAM_SSH_TC_TCH, "TCH" }, \ | ||
| 255 | { SSAM_SSH_TC_BKL, "BKL" }, \ | ||
| 256 | { SSAM_SSH_TC_TAM, "TAM" }, \ | ||
| 257 | { SSAM_SSH_TC_ACC, "ACC" }, \ | ||
| 258 | { SSAM_SSH_TC_UFI, "UFI" }, \ | ||
| 259 | { SSAM_SSH_TC_USC, "USC" }, \ | ||
| 260 | { SSAM_SSH_TC_PEN, "PEN" }, \ | ||
| 261 | { SSAM_SSH_TC_VID, "VID" }, \ | ||
| 262 | { SSAM_SSH_TC_AUD, "AUD" }, \ | ||
| 263 | { SSAM_SSH_TC_SMC, "SMC" }, \ | ||
| 264 | { SSAM_SSH_TC_KPD, "KPD" }, \ | ||
| 265 | { SSAM_SSH_TC_REG, "REG" } \ | ||
| 266 | ) | ||
| 267 | |||
| 268 | DECLARE_EVENT_CLASS(ssam_frame_class, | ||
| 269 | TP_PROTO(const struct ssh_frame *frame), | ||
| 270 | |||
| 271 | TP_ARGS(frame), | ||
| 272 | |||
| 273 | TP_STRUCT__entry( | ||
| 274 | __field(u8, type) | ||
| 275 | __field(u8, seq) | ||
| 276 | __field(u16, len) | ||
| 277 | ), | ||
| 278 | |||
| 279 | TP_fast_assign( | ||
| 280 | __entry->type = frame->type; | ||
| 281 | __entry->seq = frame->seq; | ||
| 282 | __entry->len = get_unaligned_le16(&frame->len); | ||
| 283 | ), | ||
| 284 | |||
| 285 | TP_printk("ty=%s, seq=%#04x, len=%u", | ||
| 286 | ssam_show_frame_type(__entry->type), | ||
| 287 | __entry->seq, | ||
| 288 | __entry->len | ||
| 289 | ) | ||
| 290 | ); | ||
| 291 | |||
| 292 | #define DEFINE_SSAM_FRAME_EVENT(name) \ | ||
| 293 | DEFINE_EVENT(ssam_frame_class, ssam_##name, \ | ||
| 294 | TP_PROTO(const struct ssh_frame *frame), \ | ||
| 295 | TP_ARGS(frame) \ | ||
| 296 | ) | ||
| 297 | |||
| 298 | DECLARE_EVENT_CLASS(ssam_command_class, | ||
| 299 | TP_PROTO(const struct ssh_command *cmd, u16 len), | ||
| 300 | |||
| 301 | TP_ARGS(cmd, len), | ||
| 302 | |||
| 303 | TP_STRUCT__entry( | ||
| 304 | __field(u16, rqid) | ||
| 305 | __field(u16, len) | ||
| 306 | __field(u8, tc) | ||
| 307 | __field(u8, cid) | ||
| 308 | __field(u8, iid) | ||
| 309 | ), | ||
| 310 | |||
| 311 | TP_fast_assign( | ||
| 312 | __entry->rqid = get_unaligned_le16(&cmd->rqid); | ||
| 313 | __entry->tc = cmd->tc; | ||
| 314 | __entry->cid = cmd->cid; | ||
| 315 | __entry->iid = cmd->iid; | ||
| 316 | __entry->len = len; | ||
| 317 | ), | ||
| 318 | |||
| 319 | TP_printk("rqid=%#06x, tc=%s, cid=%#04x, iid=%#04x, len=%u", | ||
| 320 | __entry->rqid, | ||
| 321 | ssam_show_ssh_tc(__entry->tc), | ||
| 322 | __entry->cid, | ||
| 323 | __entry->iid, | ||
| 324 | __entry->len | ||
| 325 | ) | ||
| 326 | ); | ||
| 327 | |||
| 328 | #define DEFINE_SSAM_COMMAND_EVENT(name) \ | ||
| 329 | DEFINE_EVENT(ssam_command_class, ssam_##name, \ | ||
| 330 | TP_PROTO(const struct ssh_command *cmd, u16 len), \ | ||
| 331 | TP_ARGS(cmd, len) \ | ||
| 332 | ) | ||
| 333 | |||
| 334 | DECLARE_EVENT_CLASS(ssam_packet_class, | ||
| 335 | TP_PROTO(const struct ssh_packet *packet), | ||
| 336 | |||
| 337 | TP_ARGS(packet), | ||
| 338 | |||
| 339 | TP_STRUCT__entry( | ||
| 340 | __field(unsigned long, state) | ||
| 341 | __array(char, uid, SSAM_PTR_UID_LEN) | ||
| 342 | __field(u8, priority) | ||
| 343 | __field(u16, length) | ||
| 344 | __field(u16, seq) | ||
| 345 | ), | ||
| 346 | |||
| 347 | TP_fast_assign( | ||
| 348 | __entry->state = READ_ONCE(packet->state); | ||
| 349 | ssam_trace_ptr_uid(packet, __entry->uid); | ||
| 350 | __entry->priority = READ_ONCE(packet->priority); | ||
| 351 | __entry->length = packet->data.len; | ||
| 352 | __entry->seq = ssam_trace_get_packet_seq(packet); | ||
| 353 | ), | ||
| 354 | |||
| 355 | TP_printk("uid=%s, seq=%s, ty=%s, pri=%#04x, len=%u, sta=%s", | ||
| 356 | __entry->uid, | ||
| 357 | ssam_show_packet_seq(__entry->seq), | ||
| 358 | ssam_show_packet_type(__entry->state), | ||
| 359 | __entry->priority, | ||
| 360 | __entry->length, | ||
| 361 | ssam_show_packet_state(__entry->state) | ||
| 362 | ) | ||
| 363 | ); | ||
| 364 | |||
| 365 | #define DEFINE_SSAM_PACKET_EVENT(name) \ | ||
| 366 | DEFINE_EVENT(ssam_packet_class, ssam_##name, \ | ||
| 367 | TP_PROTO(const struct ssh_packet *packet), \ | ||
| 368 | TP_ARGS(packet) \ | ||
| 369 | ) | ||
| 370 | |||
| 371 | DECLARE_EVENT_CLASS(ssam_packet_status_class, | ||
| 372 | TP_PROTO(const struct ssh_packet *packet, int status), | ||
| 373 | |||
| 374 | TP_ARGS(packet, status), | ||
| 375 | |||
| 376 | TP_STRUCT__entry( | ||
| 377 | __field(unsigned long, state) | ||
| 378 | __field(int, status) | ||
| 379 | __array(char, uid, SSAM_PTR_UID_LEN) | ||
| 380 | __field(u8, priority) | ||
| 381 | __field(u16, length) | ||
| 382 | __field(u16, seq) | ||
| 383 | ), | ||
| 384 | |||
| 385 | TP_fast_assign( | ||
| 386 | __entry->state = READ_ONCE(packet->state); | ||
| 387 | __entry->status = status; | ||
| 388 | ssam_trace_ptr_uid(packet, __entry->uid); | ||
| 389 | __entry->priority = READ_ONCE(packet->priority); | ||
| 390 | __entry->length = packet->data.len; | ||
| 391 | __entry->seq = ssam_trace_get_packet_seq(packet); | ||
| 392 | ), | ||
| 393 | |||
| 394 | TP_printk("uid=%s, seq=%s, ty=%s, pri=%#04x, len=%u, sta=%s, status=%d", | ||
| 395 | __entry->uid, | ||
| 396 | ssam_show_packet_seq(__entry->seq), | ||
| 397 | ssam_show_packet_type(__entry->state), | ||
| 398 | __entry->priority, | ||
| 399 | __entry->length, | ||
| 400 | ssam_show_packet_state(__entry->state), | ||
| 401 | __entry->status | ||
| 402 | ) | ||
| 403 | ); | ||
| 404 | |||
| 405 | #define DEFINE_SSAM_PACKET_STATUS_EVENT(name) \ | ||
| 406 | DEFINE_EVENT(ssam_packet_status_class, ssam_##name, \ | ||
| 407 | TP_PROTO(const struct ssh_packet *packet, int status), \ | ||
| 408 | TP_ARGS(packet, status) \ | ||
| 409 | ) | ||
| 410 | |||
| 411 | DECLARE_EVENT_CLASS(ssam_request_class, | ||
| 412 | TP_PROTO(const struct ssh_request *request), | ||
| 413 | |||
| 414 | TP_ARGS(request), | ||
| 415 | |||
| 416 | TP_STRUCT__entry( | ||
| 417 | __field(unsigned long, state) | ||
| 418 | __field(u32, rqid) | ||
| 419 | __array(char, uid, SSAM_PTR_UID_LEN) | ||
| 420 | __field(u8, tc) | ||
| 421 | __field(u16, cid) | ||
| 422 | __field(u16, iid) | ||
| 423 | ), | ||
| 424 | |||
| 425 | TP_fast_assign( | ||
| 426 | const struct ssh_packet *p = &request->packet; | ||
| 427 | |||
| 428 | /* Use packet for UID so we can match requests to packets. */ | ||
| 429 | __entry->state = READ_ONCE(request->state); | ||
| 430 | __entry->rqid = ssam_trace_get_request_id(p); | ||
| 431 | ssam_trace_ptr_uid(p, __entry->uid); | ||
| 432 | __entry->tc = ssam_trace_get_request_tc(p); | ||
| 433 | __entry->cid = ssam_trace_get_command_field_u8(p, cid); | ||
| 434 | __entry->iid = ssam_trace_get_command_field_u8(p, iid); | ||
| 435 | ), | ||
| 436 | |||
| 437 | TP_printk("uid=%s, rqid=%s, ty=%s, sta=%s, tc=%s, cid=%s, iid=%s", | ||
| 438 | __entry->uid, | ||
| 439 | ssam_show_request_id(__entry->rqid), | ||
| 440 | ssam_show_request_type(__entry->state), | ||
| 441 | ssam_show_request_state(__entry->state), | ||
| 442 | ssam_show_ssh_tc(__entry->tc), | ||
| 443 | ssam_show_generic_u8_field(__entry->cid), | ||
| 444 | ssam_show_generic_u8_field(__entry->iid) | ||
| 445 | ) | ||
| 446 | ); | ||
| 447 | |||
| 448 | #define DEFINE_SSAM_REQUEST_EVENT(name) \ | ||
| 449 | DEFINE_EVENT(ssam_request_class, ssam_##name, \ | ||
| 450 | TP_PROTO(const struct ssh_request *request), \ | ||
| 451 | TP_ARGS(request) \ | ||
| 452 | ) | ||
| 453 | |||
| 454 | DECLARE_EVENT_CLASS(ssam_request_status_class, | ||
| 455 | TP_PROTO(const struct ssh_request *request, int status), | ||
| 456 | |||
| 457 | TP_ARGS(request, status), | ||
| 458 | |||
| 459 | TP_STRUCT__entry( | ||
| 460 | __field(unsigned long, state) | ||
| 461 | __field(u32, rqid) | ||
| 462 | __field(int, status) | ||
| 463 | __array(char, uid, SSAM_PTR_UID_LEN) | ||
| 464 | __field(u8, tc) | ||
| 465 | __field(u16, cid) | ||
| 466 | __field(u16, iid) | ||
| 467 | ), | ||
| 468 | |||
| 469 | TP_fast_assign( | ||
| 470 | const struct ssh_packet *p = &request->packet; | ||
| 471 | |||
| 472 | /* Use packet for UID so we can match requests to packets. */ | ||
| 473 | __entry->state = READ_ONCE(request->state); | ||
| 474 | __entry->rqid = ssam_trace_get_request_id(p); | ||
| 475 | __entry->status = status; | ||
| 476 | ssam_trace_ptr_uid(p, __entry->uid); | ||
| 477 | __entry->tc = ssam_trace_get_request_tc(p); | ||
| 478 | __entry->cid = ssam_trace_get_command_field_u8(p, cid); | ||
| 479 | __entry->iid = ssam_trace_get_command_field_u8(p, iid); | ||
| 480 | ), | ||
| 481 | |||
| 482 | TP_printk("uid=%s, rqid=%s, ty=%s, sta=%s, tc=%s, cid=%s, iid=%s, status=%d", | ||
| 483 | __entry->uid, | ||
| 484 | ssam_show_request_id(__entry->rqid), | ||
| 485 | ssam_show_request_type(__entry->state), | ||
| 486 | ssam_show_request_state(__entry->state), | ||
| 487 | ssam_show_ssh_tc(__entry->tc), | ||
| 488 | ssam_show_generic_u8_field(__entry->cid), | ||
| 489 | ssam_show_generic_u8_field(__entry->iid), | ||
| 490 | __entry->status | ||
| 491 | ) | ||
| 492 | ); | ||
| 493 | |||
| 494 | #define DEFINE_SSAM_REQUEST_STATUS_EVENT(name) \ | ||
| 495 | DEFINE_EVENT(ssam_request_status_class, ssam_##name, \ | ||
| 496 | TP_PROTO(const struct ssh_request *request, int status),\ | ||
| 497 | TP_ARGS(request, status) \ | ||
| 498 | ) | ||
| 499 | |||
| 500 | DECLARE_EVENT_CLASS(ssam_alloc_class, | ||
| 501 | TP_PROTO(void *ptr, size_t len), | ||
| 502 | |||
| 503 | TP_ARGS(ptr, len), | ||
| 504 | |||
| 505 | TP_STRUCT__entry( | ||
| 506 | __field(size_t, len) | ||
| 507 | __array(char, uid, SSAM_PTR_UID_LEN) | ||
| 508 | ), | ||
| 509 | |||
| 510 | TP_fast_assign( | ||
| 511 | __entry->len = len; | ||
| 512 | ssam_trace_ptr_uid(ptr, __entry->uid); | ||
| 513 | ), | ||
| 514 | |||
| 515 | TP_printk("uid=%s, len=%zu", __entry->uid, __entry->len) | ||
| 516 | ); | ||
| 517 | |||
| 518 | #define DEFINE_SSAM_ALLOC_EVENT(name) \ | ||
| 519 | DEFINE_EVENT(ssam_alloc_class, ssam_##name, \ | ||
| 520 | TP_PROTO(void *ptr, size_t len), \ | ||
| 521 | TP_ARGS(ptr, len) \ | ||
| 522 | ) | ||
| 523 | |||
| 524 | DECLARE_EVENT_CLASS(ssam_free_class, | ||
| 525 | TP_PROTO(void *ptr), | ||
| 526 | |||
| 527 | TP_ARGS(ptr), | ||
| 528 | |||
| 529 | TP_STRUCT__entry( | ||
| 530 | __array(char, uid, SSAM_PTR_UID_LEN) | ||
| 531 | ), | ||
| 532 | |||
| 533 | TP_fast_assign( | ||
| 534 | ssam_trace_ptr_uid(ptr, __entry->uid); | ||
| 535 | ), | ||
| 536 | |||
| 537 | TP_printk("uid=%s", __entry->uid) | ||
| 538 | ); | ||
| 539 | |||
| 540 | #define DEFINE_SSAM_FREE_EVENT(name) \ | ||
| 541 | DEFINE_EVENT(ssam_free_class, ssam_##name, \ | ||
| 542 | TP_PROTO(void *ptr), \ | ||
| 543 | TP_ARGS(ptr) \ | ||
| 544 | ) | ||
| 545 | |||
| 546 | DECLARE_EVENT_CLASS(ssam_pending_class, | ||
| 547 | TP_PROTO(unsigned int pending), | ||
| 548 | |||
| 549 | TP_ARGS(pending), | ||
| 550 | |||
| 551 | TP_STRUCT__entry( | ||
| 552 | __field(unsigned int, pending) | ||
| 553 | ), | ||
| 554 | |||
| 555 | TP_fast_assign( | ||
| 556 | __entry->pending = pending; | ||
| 557 | ), | ||
| 558 | |||
| 559 | TP_printk("pending=%u", __entry->pending) | ||
| 560 | ); | ||
| 561 | |||
| 562 | #define DEFINE_SSAM_PENDING_EVENT(name) \ | ||
| 563 | DEFINE_EVENT(ssam_pending_class, ssam_##name, \ | ||
| 564 | TP_PROTO(unsigned int pending), \ | ||
| 565 | TP_ARGS(pending) \ | ||
| 566 | ) | ||
| 567 | |||
| 568 | DECLARE_EVENT_CLASS(ssam_data_class, | ||
| 569 | TP_PROTO(size_t length), | ||
| 570 | |||
| 571 | TP_ARGS(length), | ||
| 572 | |||
| 573 | TP_STRUCT__entry( | ||
| 574 | __field(size_t, length) | ||
| 575 | ), | ||
| 576 | |||
| 577 | TP_fast_assign( | ||
| 578 | __entry->length = length; | ||
| 579 | ), | ||
| 580 | |||
| 581 | TP_printk("length=%zu", __entry->length) | ||
| 582 | ); | ||
| 583 | |||
| 584 | #define DEFINE_SSAM_DATA_EVENT(name) \ | ||
| 585 | DEFINE_EVENT(ssam_data_class, ssam_##name, \ | ||
| 586 | TP_PROTO(size_t length), \ | ||
| 587 | TP_ARGS(length) \ | ||
| 588 | ) | ||
| 589 | |||
| 590 | DEFINE_SSAM_FRAME_EVENT(rx_frame_received); | ||
| 591 | DEFINE_SSAM_COMMAND_EVENT(rx_response_received); | ||
| 592 | DEFINE_SSAM_COMMAND_EVENT(rx_event_received); | ||
| 593 | |||
| 594 | DEFINE_SSAM_PACKET_EVENT(packet_release); | ||
| 595 | DEFINE_SSAM_PACKET_EVENT(packet_submit); | ||
| 596 | DEFINE_SSAM_PACKET_EVENT(packet_resubmit); | ||
| 597 | DEFINE_SSAM_PACKET_EVENT(packet_timeout); | ||
| 598 | DEFINE_SSAM_PACKET_EVENT(packet_cancel); | ||
| 599 | DEFINE_SSAM_PACKET_STATUS_EVENT(packet_complete); | ||
| 600 | DEFINE_SSAM_PENDING_EVENT(ptl_timeout_reap); | ||
| 601 | |||
| 602 | DEFINE_SSAM_REQUEST_EVENT(request_submit); | ||
| 603 | DEFINE_SSAM_REQUEST_EVENT(request_timeout); | ||
| 604 | DEFINE_SSAM_REQUEST_EVENT(request_cancel); | ||
| 605 | DEFINE_SSAM_REQUEST_STATUS_EVENT(request_complete); | ||
| 606 | DEFINE_SSAM_PENDING_EVENT(rtl_timeout_reap); | ||
| 607 | |||
| 608 | DEFINE_SSAM_PACKET_EVENT(ei_tx_drop_ack_packet); | ||
| 609 | DEFINE_SSAM_PACKET_EVENT(ei_tx_drop_nak_packet); | ||
| 610 | DEFINE_SSAM_PACKET_EVENT(ei_tx_drop_dsq_packet); | ||
| 611 | DEFINE_SSAM_PACKET_STATUS_EVENT(ei_tx_fail_write); | ||
| 612 | DEFINE_SSAM_PACKET_EVENT(ei_tx_corrupt_data); | ||
| 613 | DEFINE_SSAM_DATA_EVENT(ei_rx_corrupt_syn); | ||
| 614 | DEFINE_SSAM_FRAME_EVENT(ei_rx_corrupt_data); | ||
| 615 | DEFINE_SSAM_REQUEST_EVENT(ei_rx_drop_response); | ||
| 616 | |||
| 617 | DEFINE_SSAM_ALLOC_EVENT(ctrl_packet_alloc); | ||
| 618 | DEFINE_SSAM_FREE_EVENT(ctrl_packet_free); | ||
| 619 | |||
| 620 | DEFINE_SSAM_ALLOC_EVENT(event_item_alloc); | ||
| 621 | DEFINE_SSAM_FREE_EVENT(event_item_free); | ||
| 622 | |||
| 623 | #endif /* _SURFACE_AGGREGATOR_TRACE_H */ | ||
| 624 | |||
| 625 | /* This part must be outside protection */ | ||
| 626 | #undef TRACE_INCLUDE_PATH | ||
| 627 | #undef TRACE_INCLUDE_FILE | ||
| 628 | |||
| 629 | #define TRACE_INCLUDE_PATH . | ||
| 630 | #define TRACE_INCLUDE_FILE trace | ||
| 631 | |||
| 632 | #include <trace/define_trace.h> | ||
| @@ -57,12 +57,16 @@ static DEFINE_MUTEX(s3_wmi_lock); · 56 unmodified lines | |||
| 57 | static int s3_wmi_query_block(const char *guid, int instance, int *ret) | 57 | static int s3_wmi_query_block(const char *guid, int instance, int *ret) |
| 58 | { | 58 | { |
| 59 | struct acpi_buffer output = { ACPI_ALLOCATE_BUFFER, NULL }; | 59 | struct acpi_buffer output = { ACPI_ALLOCATE_BUFFER, NULL }; |
| 60 | union acpi_object *obj = NULL; | ||
| 60 | acpi_status status; | 61 | acpi_status status; |
| 61 | union acpi_object *obj; | ||
| 62 | int error = 0; | 62 | int error = 0; |
| 63 | 63 | ||
| 64 | mutex_lock(&s3_wmi_lock); | 64 | mutex_lock(&s3_wmi_lock); |
| 65 | status = wmi_query_block(guid, instance, &output); | 65 | status = wmi_query_block(guid, instance, &output); |
| 66 | if (ACPI_FAILURE(status)) { | ||
| 67 | error = -EIO; | ||
| 68 | goto out_free_unlock; | ||
| 69 | } | ||
| 66 | 70 | ||
| 67 | obj = output.pointer; | 71 | obj = output.pointer; |
| 68 | 72 | ||
| @@ -0,0 +1,886 @@ | |||
| 1 | // SPDX-License-Identifier: GPL-2.0+ | ||
| 2 | /* | ||
| 3 | * Driver for the Surface ACPI Notify (SAN) interface/shim. | ||
| 4 | * | ||
| 5 | * Translates communication from ACPI to Surface System Aggregator Module | ||
| 6 | * (SSAM/SAM) requests and back, specifically SAM-over-SSH. Translates SSAM | ||
| 7 | * events back to ACPI notifications. Allows handling of discrete GPU | ||
| 8 | * notifications sent from ACPI via the SAN interface by providing them to any | ||
| 9 | * registered external driver. | ||
| 10 | * | ||
| 11 | * Copyright (C) 2019-2020 Maximilian Luz <luzmaximilian@gmail.com> | ||
| 12 | */ | ||
| 13 | |||
| 14 | #include <asm/unaligned.h> | ||
| 15 | #include <linux/acpi.h> | ||
| 16 | #include <linux/delay.h> | ||
| 17 | #include <linux/jiffies.h> | ||
| 18 | #include <linux/kernel.h> | ||
| 19 | #include <linux/module.h> | ||
| 20 | #include <linux/notifier.h> | ||
| 21 | #include <linux/platform_device.h> | ||
| 22 | #include <linux/rwsem.h> | ||
| 23 | |||
| 24 | #include <linux/surface_aggregator/controller.h> | ||
| 25 | #include <linux/surface_acpi_notify.h> | ||
| 26 | |||
| 27 | struct san_data { | ||
| 28 | struct device *dev; | ||
| 29 | struct ssam_controller *ctrl; | ||
| 30 | |||
| 31 | struct acpi_connection_info info; | ||
| 32 | |||
| 33 | struct ssam_event_notifier nf_bat; | ||
| 34 | struct ssam_event_notifier nf_tmp; | ||
| 35 | }; | ||
| 36 | |||
| 37 | #define to_san_data(ptr, member) \ | ||
| 38 | container_of(ptr, struct san_data, member) | ||
| 39 | |||
| 40 | |||
| 41 | /* -- dGPU notifier interface. ---------------------------------------------- */ | ||
| 42 | |||
| 43 | struct san_rqsg_if { | ||
| 44 | struct rw_semaphore lock; | ||
| 45 | struct device *dev; | ||
| 46 | struct blocking_notifier_head nh; | ||
| 47 | }; | ||
| 48 | |||
| 49 | static struct san_rqsg_if san_rqsg_if = { | ||
| 50 | .lock = __RWSEM_INITIALIZER(san_rqsg_if.lock), | ||
| 51 | .dev = NULL, | ||
| 52 | .nh = BLOCKING_NOTIFIER_INIT(san_rqsg_if.nh), | ||
| 53 | }; | ||
| 54 | |||
| 55 | static int san_set_rqsg_interface_device(struct device *dev) | ||
| 56 | { | ||
| 57 | int status = 0; | ||
| 58 | |||
| 59 | down_write(&san_rqsg_if.lock); | ||
| 60 | if (!san_rqsg_if.dev && dev) | ||
| 61 | san_rqsg_if.dev = dev; | ||
| 62 | else | ||
| 63 | status = -EBUSY; | ||
| 64 | up_write(&san_rqsg_if.lock); | ||
| 65 | |||
| 66 | return status; | ||
| 67 | } | ||
| 68 | |||
| 69 | /** | ||
| 70 | * san_client_link() - Link client as consumer to SAN device. | ||
| 71 | * @client: The client to link. | ||
| 72 | * | ||
| 73 | * Sets up a device link between the provided client device as consumer and | ||
| 74 | * the SAN device as provider. This function can be used to ensure that the | ||
| 75 | * SAN interface has been set up and will be set up for as long as the driver | ||
| 76 | * of the client device is bound. This guarantees that, during that time, all | ||
| 77 | * dGPU events will be received by any registered notifier. | ||
| 78 | * | ||
| 79 | * The link will be automatically removed once the client device's driver is | ||
| 80 | * unbound. | ||
| 81 | * | ||
| 82 | * Return: Returns zero on success, %-ENXIO if the SAN interface has not been | ||
| 83 | * set up yet, and %-ENOMEM if device link creation failed. | ||
| 84 | */ | ||
| 85 | int san_client_link(struct device *client) | ||
| 86 | { | ||
| 87 | const u32 flags = DL_FLAG_PM_RUNTIME | DL_FLAG_AUTOREMOVE_CONSUMER; | ||
| 88 | struct device_link *link; | ||
| 89 | |||
| 90 | down_read(&san_rqsg_if.lock); | ||
| 91 | |||
| 92 | if (!san_rqsg_if.dev) { | ||
| 93 | up_read(&san_rqsg_if.lock); | ||
| 94 | return -ENXIO; | ||
| 95 | } | ||
| 96 | |||
| 97 | link = device_link_add(client, san_rqsg_if.dev, flags); | ||
| 98 | if (!link) { | ||
| 99 | up_read(&san_rqsg_if.lock); | ||
| 100 | return -ENOMEM; | ||
| 101 | } | ||
| 102 | |||
| 103 | if (READ_ONCE(link->status) == DL_STATE_SUPPLIER_UNBIND) { | ||
| 104 | up_read(&san_rqsg_if.lock); | ||
| 105 | return -ENXIO; | ||
| 106 | } | ||
| 107 | |||
| 108 | up_read(&san_rqsg_if.lock); | ||
| 109 | return 0; | ||
| 110 | } | ||
| 111 | EXPORT_SYMBOL_GPL(san_client_link); | ||
| 112 | |||
| 113 | /** | ||
| 114 | * san_dgpu_notifier_register() - Register a SAN dGPU notifier. | ||
| 115 | * @nb: The notifier-block to register. | ||
| 116 | * | ||
| 117 | * Registers a SAN dGPU notifier, receiving any new SAN dGPU events sent from | ||
| 118 | * ACPI. The registered notifier will be called with &struct san_dgpu_event | ||
| 119 | * as notifier data and the command ID of that event as notifier action. | ||
| 120 | */ | ||
| 121 | int san_dgpu_notifier_register(struct notifier_block *nb) | ||
| 122 | { | ||
| 123 | return blocking_notifier_chain_register(&san_rqsg_if.nh, nb); | ||
| 124 | } | ||
| 125 | EXPORT_SYMBOL_GPL(san_dgpu_notifier_register); | ||
| 126 | |||
| 127 | /** | ||
| 128 | * san_dgpu_notifier_unregister() - Unregister a SAN dGPU notifier. | ||
| 129 | * @nb: The notifier-block to unregister. | ||
| 130 | */ | ||
| 131 | int san_dgpu_notifier_unregister(struct notifier_block *nb) | ||
| 132 | { | ||
| 133 | return blocking_notifier_chain_unregister(&san_rqsg_if.nh, nb); | ||
| 134 | } | ||
| 135 | EXPORT_SYMBOL_GPL(san_dgpu_notifier_unregister); | ||
| 136 | |||
| 137 | static int san_dgpu_notifier_call(struct san_dgpu_event *evt) | ||
| 138 | { | ||
| 139 | int ret; | ||
| 140 | |||
| 141 | ret = blocking_notifier_call_chain(&san_rqsg_if.nh, evt->command, evt); | ||
| 142 | return notifier_to_errno(ret); | ||
| 143 | } | ||
| 144 | |||
| 145 | |||
| 146 | /* -- ACPI _DSM event relay. ------------------------------------------------ */ | ||
| 147 | |||
| 148 | #define SAN_DSM_REVISION 0 | ||
| 149 | |||
| 150 | /* 93b666c5-70c6-469f-a215-3d487c91ab3c */ | ||
| 151 | static const guid_t SAN_DSM_UUID = | ||
| 152 | GUID_INIT(0x93b666c5, 0x70c6, 0x469f, 0xa2, 0x15, 0x3d, | ||
| 153 | 0x48, 0x7c, 0x91, 0xab, 0x3c); | ||
| 154 | |||
| 155 | enum san_dsm_event_fn { | ||
| 156 | SAN_DSM_EVENT_FN_BAT1_STAT = 0x03, | ||
| 157 | SAN_DSM_EVENT_FN_BAT1_INFO = 0x04, | ||
| 158 | SAN_DSM_EVENT_FN_ADP1_STAT = 0x05, | ||
| 159 | SAN_DSM_EVENT_FN_ADP1_INFO = 0x06, | ||
| 160 | SAN_DSM_EVENT_FN_BAT2_STAT = 0x07, | ||
| 161 | SAN_DSM_EVENT_FN_BAT2_INFO = 0x08, | ||
| 162 | SAN_DSM_EVENT_FN_THERMAL = 0x09, | ||
| 163 | SAN_DSM_EVENT_FN_DPTF = 0x0a, | ||
| 164 | }; | ||
| 165 | |||
| 166 | enum sam_event_cid_bat { | ||
| 167 | SAM_EVENT_CID_BAT_BIX = 0x15, | ||
| 168 | SAM_EVENT_CID_BAT_BST = 0x16, | ||
| 169 | SAM_EVENT_CID_BAT_ADP = 0x17, | ||
| 170 | SAM_EVENT_CID_BAT_PROT = 0x18, | ||
| 171 | SAM_EVENT_CID_BAT_DPTF = 0x4f, | ||
| 172 | }; | ||
| 173 | |||
| 174 | enum sam_event_cid_tmp { | ||
| 175 | SAM_EVENT_CID_TMP_TRIP = 0x0b, | ||
| 176 | }; | ||
| 177 | |||
| 178 | struct san_event_work { | ||
| 179 | struct delayed_work work; | ||
| 180 | struct device *dev; | ||
| 181 | struct ssam_event event; /* must be last */ | ||
| 182 | }; | ||
| 183 | |||
| 184 | static int san_acpi_notify_event(struct device *dev, u64 func, | ||
| 185 | union acpi_object *param) | ||
| 186 | { | ||
| 187 | acpi_handle san = ACPI_HANDLE(dev); | ||
| 188 | union acpi_object *obj; | ||
| 189 | int status = 0; | ||
| 190 | |||
| 191 | if (!acpi_check_dsm(san, &SAN_DSM_UUID, SAN_DSM_REVISION, BIT_ULL(func))) | ||
| 192 | return 0; | ||
| 193 | |||
| 194 | dev_dbg(dev, "notify event %#04llx\n", func); | ||
| 195 | |||
| 196 | obj = acpi_evaluate_dsm_typed(san, &SAN_DSM_UUID, SAN_DSM_REVISION, | ||
| 197 | func, param, ACPI_TYPE_BUFFER); | ||
| 198 | if (!obj) | ||
| 199 | return -EFAULT; | ||
| 200 | |||
| 201 | if (obj->buffer.length != 1 || obj->buffer.pointer[0] != 0) { | ||
| 202 | dev_err(dev, "got unexpected result from _DSM\n"); | ||
| 203 | status = -EPROTO; | ||
| 204 | } | ||
| 205 | |||
| 206 | ACPI_FREE(obj); | ||
| 207 | return status; | ||
| 208 | } | ||
| 209 | |||
| 210 | static int san_evt_bat_adp(struct device *dev, const struct ssam_event *event) | ||
| 211 | { | ||
| 212 | int status; | ||
| 213 | |||
| 214 | status = san_acpi_notify_event(dev, SAN_DSM_EVENT_FN_ADP1_STAT, NULL); | ||
| 215 | if (status) | ||
| 216 | return status; | ||
| 217 | |||
| 218 | /* | ||
| 219 | * Ensure that the battery states get updated correctly. When the | ||
| 220 | * battery is fully charged and an adapter is plugged in, it sometimes | ||
| 221 | * is not updated correctly, instead showing it as charging. | ||
| 222 | * Explicitly trigger battery updates to fix this. | ||
| 223 | */ | ||
| 224 | |||
| 225 | status = san_acpi_notify_event(dev, SAN_DSM_EVENT_FN_BAT1_STAT, NULL); | ||
| 226 | if (status) | ||
| 227 | return status; | ||
| 228 | |||
| 229 | return san_acpi_notify_event(dev, SAN_DSM_EVENT_FN_BAT2_STAT, NULL); | ||
| 230 | } | ||
| 231 | |||
| 232 | static int san_evt_bat_bix(struct device *dev, const struct ssam_event *event) | ||
| 233 | { | ||
| 234 | enum san_dsm_event_fn fn; | ||
| 235 | |||
| 236 | if (event->instance_id == 0x02) | ||
| 237 | fn = SAN_DSM_EVENT_FN_BAT2_INFO; | ||
| 238 | else | ||
| 239 | fn = SAN_DSM_EVENT_FN_BAT1_INFO; | ||
| 240 | |||
| 241 | return san_acpi_notify_event(dev, fn, NULL); | ||
| 242 | } | ||
| 243 | |||
| 244 | static int san_evt_bat_bst(struct device *dev, const struct ssam_event *event) | ||
| 245 | { | ||
| 246 | enum san_dsm_event_fn fn; | ||
| 247 | |||
| 248 | if (event->instance_id == 0x02) | ||
| 249 | fn = SAN_DSM_EVENT_FN_BAT2_STAT; | ||
| 250 | else | ||
| 251 | fn = SAN_DSM_EVENT_FN_BAT1_STAT; | ||
| 252 | |||
| 253 | return san_acpi_notify_event(dev, fn, NULL); | ||
| 254 | } | ||
| 255 | |||
| 256 | static int san_evt_bat_dptf(struct device *dev, const struct ssam_event *event) | ||
| 257 | { | ||
| 258 | union acpi_object payload; | ||
| 259 | |||
| 260 | /* | ||
| 261 | * The Surface ACPI expects a buffer and not a package. It specifically | ||
| 262 | * checks for ObjectType (Arg3) == 0x03. This will cause a warning in | ||
| 263 | * acpica/nsarguments.c, but that warning can be safely ignored. | ||
| 264 | */ | ||
| 265 | payload.type = ACPI_TYPE_BUFFER; | ||
| 266 | payload.buffer.length = event->length; | ||
| 267 | payload.buffer.pointer = (u8 *)&event->data[0]; | ||
| 268 | |||
| 269 | return san_acpi_notify_event(dev, SAN_DSM_EVENT_FN_DPTF, &payload); | ||
| 270 | } | ||
| 271 | |||
| 272 | static unsigned long san_evt_bat_delay(u8 cid) | ||
| 273 | { | ||
| 274 | switch (cid) { | ||
| 275 | case SAM_EVENT_CID_BAT_ADP: | ||
| 276 | /* | ||
| 277 | * Wait for battery state to update before signaling adapter | ||
| 278 | * change. | ||
| 279 | */ | ||
| 280 | return msecs_to_jiffies(5000); | ||
| 281 | |||
| 282 | case SAM_EVENT_CID_BAT_BST: | ||
| 283 | /* Ensure we do not miss anything important due to caching. */ | ||
| 284 | return msecs_to_jiffies(2000); | ||
| 285 | |||
| 286 | default: | ||
| 287 | return 0; | ||
| 288 | } | ||
| 289 | } | ||
| 290 | |||
| 291 | static bool san_evt_bat(const struct ssam_event *event, struct device *dev) | ||
| 292 | { | ||
| 293 | int status; | ||
| 294 | |||
| 295 | switch (event->command_id) { | ||
| 296 | case SAM_EVENT_CID_BAT_BIX: | ||
| 297 | status = san_evt_bat_bix(dev, event); | ||
| 298 | break; | ||
| 299 | |||
| 300 | case SAM_EVENT_CID_BAT_BST: | ||
| 301 | status = san_evt_bat_bst(dev, event); | ||
| 302 | break; | ||
| 303 | |||
| 304 | case SAM_EVENT_CID_BAT_ADP: | ||
| 305 | status = san_evt_bat_adp(dev, event); | ||
| 306 | break; | ||
| 307 | |||
| 308 | case SAM_EVENT_CID_BAT_PROT: | ||
| 309 | /* | ||
| 310 | * TODO: Implement support for battery protection status change | ||
| 311 | * event. | ||
| 312 | */ | ||
| 313 | return true; | ||
| 314 | |||
| 315 | case SAM_EVENT_CID_BAT_DPTF: | ||
| 316 | status = san_evt_bat_dptf(dev, event); | ||
| 317 | break; | ||
| 318 | |||
| 319 | default: | ||
| 320 | return false; | ||
| 321 | } | ||
| 322 | |||
| 323 | if (status) { | ||
| 324 | dev_err(dev, "error handling power event (cid = %#04x)\n", | ||
| 325 | event->command_id); | ||
| 326 | } | ||
| 327 | |||
| 328 | return true; | ||
| 329 | } | ||
| 330 | |||
| 331 | static void san_evt_bat_workfn(struct work_struct *work) | ||
| 332 | { | ||
| 333 | struct san_event_work *ev; | ||
| 334 | |||
| 335 | ev = container_of(work, struct san_event_work, work.work); | ||
| 336 | san_evt_bat(&ev->event, ev->dev); | ||
| 337 | kfree(ev); | ||
| 338 | } | ||
| 339 | |||
| 340 | static u32 san_evt_bat_nf(struct ssam_event_notifier *nf, | ||
| 341 | const struct ssam_event *event) | ||
| 342 | { | ||
| 343 | struct san_data *d = to_san_data(nf, nf_bat); | ||
| 344 | struct san_event_work *work; | ||
| 345 | unsigned long delay = san_evt_bat_delay(event->command_id); | ||
| 346 | |||
| 347 | if (delay == 0) | ||
| 348 | return san_evt_bat(event, d->dev) ? SSAM_NOTIF_HANDLED : 0; | ||
| 349 | |||
| 350 | work = kzalloc(sizeof(*work) + event->length, GFP_KERNEL); | ||
| 351 | if (!work) | ||
| 352 | return ssam_notifier_from_errno(-ENOMEM); | ||
| 353 | |||
| 354 | INIT_DELAYED_WORK(&work->work, san_evt_bat_workfn); | ||
| 355 | work->dev = d->dev; | ||
| 356 | |||
| 357 | memcpy(&work->event, event, sizeof(struct ssam_event) + event->length); | ||
| 358 | |||
| 359 | schedule_delayed_work(&work->work, delay); | ||
| 360 | return SSAM_NOTIF_HANDLED; | ||
| 361 | } | ||
| 362 | |||
| 363 | static int san_evt_tmp_trip(struct device *dev, const struct ssam_event *event) | ||
| 364 | { | ||
| 365 | union acpi_object param; | ||
| 366 | |||
| 367 | /* | ||
| 368 | * The Surface ACPI expects an integer and not a package. This will | ||
| 369 | * cause a warning in acpica/nsarguments.c, but that warning can be | ||
| 370 | * safely ignored. | ||
| 371 | */ | ||
| 372 | param.type = ACPI_TYPE_INTEGER; | ||
| 373 | param.integer.value = event->instance_id; | ||
| 374 | |||
| 375 | return san_acpi_notify_event(dev, SAN_DSM_EVENT_FN_THERMAL, ¶m); | ||
| 376 | } | ||
| 377 | |||
| 378 | static bool san_evt_tmp(const struct ssam_event *event, struct device *dev) | ||
| 379 | { | ||
| 380 | int status; | ||
| 381 | |||
| 382 | switch (event->command_id) { | ||
| 383 | case SAM_EVENT_CID_TMP_TRIP: | ||
| 384 | status = san_evt_tmp_trip(dev, event); | ||
| 385 | break; | ||
| 386 | |||
| 387 | default: | ||
| 388 | return false; | ||
| 389 | } | ||
| 390 | |||
| 391 | if (status) { | ||
| 392 | dev_err(dev, "error handling thermal event (cid = %#04x)\n", | ||
| 393 | event->command_id); | ||
| 394 | } | ||
| 395 | |||
| 396 | return true; | ||
| 397 | } | ||
| 398 | |||
| 399 | static u32 san_evt_tmp_nf(struct ssam_event_notifier *nf, | ||
| 400 | const struct ssam_event *event) | ||
| 401 | { | ||
| 402 | struct san_data *d = to_san_data(nf, nf_tmp); | ||
| 403 | |||
| 404 | return san_evt_tmp(event, d->dev) ? SSAM_NOTIF_HANDLED : 0; | ||
| 405 | } | ||
| 406 | |||
| 407 | |||
| 408 | /* -- ACPI GSB OperationRegion handler -------------------------------------- */ | ||
| 409 | |||
| 410 | struct gsb_data_in { | ||
| 411 | u8 cv; | ||
| 412 | } __packed; | ||
| 413 | |||
| 414 | struct gsb_data_rqsx { | ||
| 415 | u8 cv; /* Command value (san_gsb_request_cv). */ | ||
| 416 | u8 tc; /* Target category. */ | ||
| 417 | u8 tid; /* Target ID. */ | ||
| 418 | u8 iid; /* Instance ID. */ | ||
| 419 | u8 snc; /* Expect-response-flag. */ | ||
| 420 | u8 cid; /* Command ID. */ | ||
| 421 | u16 cdl; /* Payload length. */ | ||
| 422 | u8 pld[]; /* Payload. */ | ||
| 423 | } __packed; | ||
| 424 | |||
| 425 | struct gsb_data_etwl { | ||
| 426 | u8 cv; /* Command value (should be 0x02). */ | ||
| 427 | u8 etw3; /* Unknown. */ | ||
| 428 | u8 etw4; /* Unknown. */ | ||
| 429 | u8 msg[]; /* Error message (ASCIIZ). */ | ||
| 430 | } __packed; | ||
| 431 | |||
| 432 | struct gsb_data_out { | ||
| 433 | u8 status; /* _SSH communication status. */ | ||
| 434 | u8 len; /* _SSH payload length. */ | ||
| 435 | u8 pld[]; /* _SSH payload. */ | ||
| 436 | } __packed; | ||
| 437 | |||
| 438 | union gsb_buffer_data { | ||
| 439 | struct gsb_data_in in; /* Common input. */ | ||
| 440 | struct gsb_data_rqsx rqsx; /* RQSX input. */ | ||
| 441 | struct gsb_data_etwl etwl; /* ETWL input. */ | ||
| 442 | struct gsb_data_out out; /* Output. */ | ||
| 443 | }; | ||
| 444 | |||
| 445 | struct gsb_buffer { | ||
| 446 | u8 status; /* GSB AttribRawProcess status. */ | ||
| 447 | u8 len; /* GSB AttribRawProcess length. */ | ||
| 448 | union gsb_buffer_data data; | ||
| 449 | } __packed; | ||
| 450 | |||
| 451 | #define SAN_GSB_MAX_RQSX_PAYLOAD (U8_MAX - 2 - sizeof(struct gsb_data_rqsx)) | ||
| 452 | #define SAN_GSB_MAX_RESPONSE (U8_MAX - 2 - sizeof(struct gsb_data_out)) | ||
| 453 | |||
| 454 | #define SAN_GSB_COMMAND 0 | ||
| 455 | |||
| 456 | enum san_gsb_request_cv { | ||
| 457 | SAN_GSB_REQUEST_CV_RQST = 0x01, | ||
| 458 | SAN_GSB_REQUEST_CV_ETWL = 0x02, | ||
| 459 | SAN_GSB_REQUEST_CV_RQSG = 0x03, | ||
| 460 | }; | ||
| 461 | |||
| 462 | #define SAN_REQUEST_NUM_TRIES 5 | ||
| 463 | |||
| 464 | static acpi_status san_etwl(struct san_data *d, struct gsb_buffer *b) | ||
| 465 | { | ||
| 466 | struct gsb_data_etwl *etwl = &b->data.etwl; | ||
| 467 | |||
| 468 | if (b->len < sizeof(struct gsb_data_etwl)) { | ||
| 469 | dev_err(d->dev, "invalid ETWL package (len = %d)\n", b->len); | ||
| 470 | return AE_OK; | ||
| 471 | } | ||
| 472 | |||
| 473 | dev_err(d->dev, "ETWL(%#04x, %#04x): %.*s\n", etwl->etw3, etwl->etw4, | ||
| 474 | (unsigned int)(b->len - sizeof(struct gsb_data_etwl)), | ||
| 475 | (char *)etwl->msg); | ||
| 476 | |||
| 477 | /* Indicate success. */ | ||
| 478 | b->status = 0x00; | ||
| 479 | b->len = 0x00; | ||
| 480 | |||
| 481 | return AE_OK; | ||
| 482 | } | ||
| 483 | |||
| 484 | static | ||
| 485 | struct gsb_data_rqsx *san_validate_rqsx(struct device *dev, const char *type, | ||
| 486 | struct gsb_buffer *b) | ||
| 487 | { | ||
| 488 | struct gsb_data_rqsx *rqsx = &b->data.rqsx; | ||
| 489 | |||
| 490 | if (b->len < sizeof(struct gsb_data_rqsx)) { | ||
| 491 | dev_err(dev, "invalid %s package (len = %d)\n", type, b->len); | ||
| 492 | return NULL; | ||
| 493 | } | ||
| 494 | |||
| 495 | if (get_unaligned(&rqsx->cdl) != b->len - sizeof(struct gsb_data_rqsx)) { | ||
| 496 | dev_err(dev, "bogus %s package (len = %d, cdl = %d)\n", | ||
| 497 | type, b->len, get_unaligned(&rqsx->cdl)); | ||
| 498 | return NULL; | ||
| 499 | } | ||
| 500 | |||
| 501 | if (get_unaligned(&rqsx->cdl) > SAN_GSB_MAX_RQSX_PAYLOAD) { | ||
| 502 | dev_err(dev, "payload for %s package too large (cdl = %d)\n", | ||
| 503 | type, get_unaligned(&rqsx->cdl)); | ||
| 504 | return NULL; | ||
| 505 | } | ||
| 506 | |||
| 507 | return rqsx; | ||
| 508 | } | ||
| 509 | |||
| 510 | static void gsb_rqsx_response_error(struct gsb_buffer *gsb, int status) | ||
| 511 | { | ||
| 512 | gsb->status = 0x00; | ||
| 513 | gsb->len = 0x02; | ||
| 514 | gsb->data.out.status = (u8)(-status); | ||
| 515 | gsb->data.out.len = 0x00; | ||
| 516 | } | ||
| 517 | |||
| 518 | static void gsb_rqsx_response_success(struct gsb_buffer *gsb, u8 *ptr, size_t len) | ||
| 519 | { | ||
| 520 | gsb->status = 0x00; | ||
| 521 | gsb->len = len + 2; | ||
| 522 | gsb->data.out.status = 0x00; | ||
| 523 | gsb->data.out.len = len; | ||
| 524 | |||
| 525 | if (len) | ||
| 526 | memcpy(&gsb->data.out.pld[0], ptr, len); | ||
| 527 | } | ||
| 528 | |||
| 529 | static acpi_status san_rqst_fixup_suspended(struct san_data *d, | ||
| 530 | struct ssam_request *rqst, | ||
| 531 | struct gsb_buffer *gsb) | ||
| 532 | { | ||
| 533 | if (rqst->target_category == SSAM_SSH_TC_BAS && rqst->command_id == 0x0D) { | ||
| 534 | u8 base_state = 1; | ||
| 535 | |||
| 536 | /* Base state quirk: | ||
| 537 | * The base state may be queried from ACPI when the EC is still | ||
| 538 | * suspended. In this case it will return '-EPERM'. This query | ||
| 539 | * will only be triggered from the ACPI lid GPE interrupt, thus | ||
| 540 | * we are either in laptop or studio mode (base status 0x01 or | ||
| 541 | * 0x02). Furthermore, we will only get here if the device (and | ||
| 542 | * EC) have been suspended. | ||
| 543 | * | ||
| 544 | * We now assume that the device is in laptop mode (0x01). This | ||
| 545 | * has the drawback that it will wake the device when unfolding | ||
| 546 | * it in studio mode, but it also allows us to avoid actively | ||
| 547 | * waiting for the EC to wake up, which may incur a notable | ||
| 548 | * delay. | ||
| 549 | */ | ||
| 550 | |||
| 551 | dev_dbg(d->dev, "rqst: fixup: base-state quirk\n"); | ||
| 552 | |||
| 553 | gsb_rqsx_response_success(gsb, &base_state, sizeof(base_state)); | ||
| 554 | return AE_OK; | ||
| 555 | } | ||
| 556 | |||
| 557 | gsb_rqsx_response_error(gsb, -ENXIO); | ||
| 558 | return AE_OK; | ||
| 559 | } | ||
| 560 | |||
| 561 | static acpi_status san_rqst(struct san_data *d, struct gsb_buffer *buffer) | ||
| 562 | { | ||
| 563 | u8 rspbuf[SAN_GSB_MAX_RESPONSE]; | ||
| 564 | struct gsb_data_rqsx *gsb_rqst; | ||
| 565 | struct ssam_request rqst; | ||
| 566 | struct ssam_response rsp; | ||
| 567 | int status = 0; | ||
| 568 | |||
| 569 | gsb_rqst = san_validate_rqsx(d->dev, "RQST", buffer); | ||
| 570 | if (!gsb_rqst) | ||
| 571 | return AE_OK; | ||
| 572 | |||
| 573 | rqst.target_category = gsb_rqst->tc; | ||
| 574 | rqst.target_id = gsb_rqst->tid; | ||
| 575 | rqst.command_id = gsb_rqst->cid; | ||
| 576 | rqst.instance_id = gsb_rqst->iid; | ||
| 577 | rqst.flags = gsb_rqst->snc ? SSAM_REQUEST_HAS_RESPONSE : 0; | ||
| 578 | rqst.length = get_unaligned(&gsb_rqst->cdl); | ||
| 579 | rqst.payload = &gsb_rqst->pld[0]; | ||
| 580 | |||
| 581 | rsp.capacity = ARRAY_SIZE(rspbuf); | ||
| 582 | rsp.length = 0; | ||
| 583 | rsp.pointer = &rspbuf[0]; | ||
| 584 | |||
| 585 | /* Handle suspended device. */ | ||
| 586 | if (d->dev->power.is_suspended) { | ||
| 587 | dev_warn(d->dev, "rqst: device is suspended, not executing\n"); | ||
| 588 | return san_rqst_fixup_suspended(d, &rqst, buffer); | ||
| 589 | } | ||
| 590 | |||
| 591 | status = __ssam_retry(ssam_request_sync_onstack, SAN_REQUEST_NUM_TRIES, | ||
| 592 | d->ctrl, &rqst, &rsp, SAN_GSB_MAX_RQSX_PAYLOAD); | ||
| 593 | |||
| 594 | if (!status) { | ||
| 595 | gsb_rqsx_response_success(buffer, rsp.pointer, rsp.length); | ||
| 596 | } else { | ||
| 597 | dev_err(d->dev, "rqst: failed with error %d\n", status); | ||
| 598 | gsb_rqsx_response_error(buffer, status); | ||
| 599 | } | ||
| 600 | |||
| 601 | return AE_OK; | ||
| 602 | } | ||
| 603 | |||
| 604 | static acpi_status san_rqsg(struct san_data *d, struct gsb_buffer *buffer) | ||
| 605 | { | ||
| 606 | struct gsb_data_rqsx *gsb_rqsg; | ||
| 607 | struct san_dgpu_event evt; | ||
| 608 | int status; | ||
| 609 | |||
| 610 | gsb_rqsg = san_validate_rqsx(d->dev, "RQSG", buffer); | ||
| 611 | if (!gsb_rqsg) | ||
| 612 | return AE_OK; | ||
| 613 | |||
| 614 | evt.category = gsb_rqsg->tc; | ||
| 615 | evt.target = gsb_rqsg->tid; | ||
| 616 | evt.command = gsb_rqsg->cid; | ||
| 617 | evt.instance = gsb_rqsg->iid; | ||
| 618 | evt.length = get_unaligned(&gsb_rqsg->cdl); | ||
| 619 | evt.payload = &gsb_rqsg->pld[0]; | ||
| 620 | |||
| 621 | status = san_dgpu_notifier_call(&evt); | ||
| 622 | if (!status) { | ||
| 623 | gsb_rqsx_response_success(buffer, NULL, 0); | ||
| 624 | } else { | ||
| 625 | dev_err(d->dev, "rqsg: failed with error %d\n", status); | ||
| 626 | gsb_rqsx_response_error(buffer, status); | ||
| 627 | } | ||
| 628 | |||
| 629 | return AE_OK; | ||
| 630 | } | ||
| 631 | |||
| 632 | static acpi_status san_opreg_handler(u32 function, acpi_physical_address command, | ||
| 633 | u32 bits, u64 *value64, void *opreg_context, | ||
| 634 | void *region_context) | ||
| 635 | { | ||
| 636 | struct san_data *d = to_san_data(opreg_context, info); | ||
| 637 | struct gsb_buffer *buffer = (struct gsb_buffer *)value64; | ||
| 638 | int accessor_type = (function & 0xFFFF0000) >> 16; | ||
| 639 | |||
| 640 | if (command != SAN_GSB_COMMAND) { | ||
| 641 | dev_warn(d->dev, "unsupported command: %#04llx\n", command); | ||
| 642 | return AE_OK; | ||
| 643 | } | ||
| 644 | |||
| 645 | if (accessor_type != ACPI_GSB_ACCESS_ATTRIB_RAW_PROCESS) { | ||
| 646 | dev_err(d->dev, "invalid access type: %#04x\n", accessor_type); | ||
| 647 | return AE_OK; | ||
| 648 | } | ||
| 649 | |||
| 650 | /* Buffer must have at least contain the command-value. */ | ||
| 651 | if (buffer->len == 0) { | ||
| 652 | dev_err(d->dev, "request-package too small\n"); | ||
| 653 | return AE_OK; | ||
| 654 | } | ||
| 655 | |||
| 656 | switch (buffer->data.in.cv) { | ||
| 657 | case SAN_GSB_REQUEST_CV_RQST: | ||
| 658 | return san_rqst(d, buffer); | ||
| 659 | |||
| 660 | case SAN_GSB_REQUEST_CV_ETWL: | ||
| 661 | return san_etwl(d, buffer); | ||
| 662 | |||
| 663 | case SAN_GSB_REQUEST_CV_RQSG: | ||
| 664 | return san_rqsg(d, buffer); | ||
| 665 | |||
| 666 | default: | ||
| 667 | dev_warn(d->dev, "unsupported SAN0 request (cv: %#04x)\n", | ||
| 668 | buffer->data.in.cv); | ||
| 669 | return AE_OK; | ||
| 670 | } | ||
| 671 | } | ||
| 672 | |||
| 673 | |||
| 674 | /* -- Driver setup. --------------------------------------------------------- */ | ||
| 675 | |||
| 676 | static int san_events_register(struct platform_device *pdev) | ||
| 677 | { | ||
| 678 | struct san_data *d = platform_get_drvdata(pdev); | ||
| 679 | int status; | ||
| 680 | |||
| 681 | d->nf_bat.base.priority = 1; | ||
| 682 | d->nf_bat.base.fn = san_evt_bat_nf; | ||
| 683 | d->nf_bat.event.reg = SSAM_EVENT_REGISTRY_SAM; | ||
| 684 | d->nf_bat.event.id.target_category = SSAM_SSH_TC_BAT; | ||
| 685 | d->nf_bat.event.id.instance = 0; | ||
| 686 | d->nf_bat.event.mask = SSAM_EVENT_MASK_TARGET; | ||
| 687 | d->nf_bat.event.flags = SSAM_EVENT_SEQUENCED; | ||
| 688 | |||
| 689 | d->nf_tmp.base.priority = 1; | ||
| 690 | d->nf_tmp.base.fn = san_evt_tmp_nf; | ||
| 691 | d->nf_tmp.event.reg = SSAM_EVENT_REGISTRY_SAM; | ||
| 692 | d->nf_tmp.event.id.target_category = SSAM_SSH_TC_TMP; | ||
| 693 | d->nf_tmp.event.id.instance = 0; | ||
| 694 | d->nf_tmp.event.mask = SSAM_EVENT_MASK_TARGET; | ||
| 695 | d->nf_tmp.event.flags = SSAM_EVENT_SEQUENCED; | ||
| 696 | |||
| 697 | status = ssam_notifier_register(d->ctrl, &d->nf_bat); | ||
| 698 | if (status) | ||
| 699 | return status; | ||
| 700 | |||
| 701 | status = ssam_notifier_register(d->ctrl, &d->nf_tmp); | ||
| 702 | if (status) | ||
| 703 | ssam_notifier_unregister(d->ctrl, &d->nf_bat); | ||
| 704 | |||
| 705 | return status; | ||
| 706 | } | ||
| 707 | |||
| 708 | static void san_events_unregister(struct platform_device *pdev) | ||
| 709 | { | ||
| 710 | struct san_data *d = platform_get_drvdata(pdev); | ||
| 711 | |||
| 712 | ssam_notifier_unregister(d->ctrl, &d->nf_bat); | ||
| 713 | ssam_notifier_unregister(d->ctrl, &d->nf_tmp); | ||
| 714 | } | ||
| 715 | |||
| 716 | #define san_consumer_printk(level, dev, handle, fmt, ...) \ | ||
| 717 | do { \ | ||
| 718 | char *path = "<error getting consumer path>"; \ | ||
| 719 | struct acpi_buffer buffer = { \ | ||
| 720 | .length = ACPI_ALLOCATE_BUFFER, \ | ||
| 721 | .pointer = NULL, \ | ||
| 722 | }; \ | ||
| 723 | \ | ||
| 724 | if (ACPI_SUCCESS(acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer))) \ | ||
| 725 | path = buffer.pointer; \ | ||
| 726 | \ | ||
| 727 | dev_##level(dev, "[%s]: " fmt, path, ##__VA_ARGS__); \ | ||
| 728 | kfree(buffer.pointer); \ | ||
| 729 | } while (0) | ||
| 730 | |||
| 731 | #define san_consumer_dbg(dev, handle, fmt, ...) \ | ||
| 732 | san_consumer_printk(dbg, dev, handle, fmt, ##__VA_ARGS__) | ||
| 733 | |||
| 734 | #define san_consumer_warn(dev, handle, fmt, ...) \ | ||
| 735 | san_consumer_printk(warn, dev, handle, fmt, ##__VA_ARGS__) | ||
| 736 | |||
| 737 | static bool is_san_consumer(struct platform_device *pdev, acpi_handle handle) | ||
| 738 | { | ||
| 739 | struct acpi_handle_list dep_devices; | ||
| 740 | acpi_handle supplier = ACPI_HANDLE(&pdev->dev); | ||
| 741 | acpi_status status; | ||
| 742 | int i; | ||
| 743 | |||
| 744 | if (!acpi_has_method(handle, "_DEP")) | ||
| 745 | return false; | ||
| 746 | |||
| 747 | status = acpi_evaluate_reference(handle, "_DEP", NULL, &dep_devices); | ||
| 748 | if (ACPI_FAILURE(status)) { | ||
| 749 | san_consumer_dbg(&pdev->dev, handle, "failed to evaluate _DEP\n"); | ||
| 750 | return false; | ||
| 751 | } | ||
| 752 | |||
| 753 | for (i = 0; i < dep_devices.count; i++) { | ||
| 754 | if (dep_devices.handles[i] == supplier) | ||
| 755 | return true; | ||
| 756 | } | ||
| 757 | |||
| 758 | return false; | ||
| 759 | } | ||
| 760 | |||
| 761 | static acpi_status san_consumer_setup(acpi_handle handle, u32 lvl, | ||
| 762 | void *context, void **rv) | ||
| 763 | { | ||
| 764 | const u32 flags = DL_FLAG_PM_RUNTIME | DL_FLAG_AUTOREMOVE_SUPPLIER; | ||
| 765 | struct platform_device *pdev = context; | ||
| 766 | struct acpi_device *adev; | ||
| 767 | struct device_link *link; | ||
| 768 | |||
| 769 | if (!is_san_consumer(pdev, handle)) | ||
| 770 | return AE_OK; | ||
| 771 | |||
| 772 | /* Ignore ACPI devices that are not present. */ | ||
| 773 | if (acpi_bus_get_device(handle, &adev) != 0) | ||
| 774 | return AE_OK; | ||
| 775 | |||
| 776 | san_consumer_dbg(&pdev->dev, handle, "creating device link\n"); | ||
| 777 | |||
| 778 | /* Try to set up device links, ignore but log errors. */ | ||
| 779 | link = device_link_add(&adev->dev, &pdev->dev, flags); | ||
| 780 | if (!link) { | ||
| 781 | san_consumer_warn(&pdev->dev, handle, "failed to create device link\n"); | ||
| 782 | return AE_OK; | ||
| 783 | } | ||
| 784 | |||
| 785 | return AE_OK; | ||
| 786 | } | ||
| 787 | |||
| 788 | static int san_consumer_links_setup(struct platform_device *pdev) | ||
| 789 | { | ||
| 790 | acpi_status status; | ||
| 791 | |||
| 792 | status = acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT, | ||
| 793 | ACPI_UINT32_MAX, san_consumer_setup, NULL, | ||
| 794 | pdev, NULL); | ||
| 795 | |||
| 796 | return status ? -EFAULT : 0; | ||
| 797 | } | ||
| 798 | |||
| 799 | static int san_probe(struct platform_device *pdev) | ||
| 800 | { | ||
| 801 | acpi_handle san = ACPI_HANDLE(&pdev->dev); | ||
| 802 | struct ssam_controller *ctrl; | ||
| 803 | struct san_data *data; | ||
| 804 | acpi_status astatus; | ||
| 805 | int status; | ||
| 806 | |||
| 807 | ctrl = ssam_client_bind(&pdev->dev); | ||
| 808 | if (IS_ERR(ctrl)) | ||
| 809 | return PTR_ERR(ctrl) == -ENODEV ? -EPROBE_DEFER : PTR_ERR(ctrl); | ||
| 810 | |||
| 811 | status = san_consumer_links_setup(pdev); | ||
| 812 | if (status) | ||
| 813 | return status; | ||
| 814 | |||
| 815 | data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL); | ||
| 816 | if (!data) | ||
| 817 | return -ENOMEM; | ||
| 818 | |||
| 819 | data->dev = &pdev->dev; | ||
| 820 | data->ctrl = ctrl; | ||
| 821 | |||
| 822 | platform_set_drvdata(pdev, data); | ||
| 823 | |||
| 824 | astatus = acpi_install_address_space_handler(san, ACPI_ADR_SPACE_GSBUS, | ||
| 825 | &san_opreg_handler, NULL, | ||
| 826 | &data->info); | ||
| 827 | if (ACPI_FAILURE(astatus)) | ||
| 828 | return -ENXIO; | ||
| 829 | |||
| 830 | status = san_events_register(pdev); | ||
| 831 | if (status) | ||
| 832 | goto err_enable_events; | ||
| 833 | |||
| 834 | status = san_set_rqsg_interface_device(&pdev->dev); | ||
| 835 | if (status) | ||
| 836 | goto err_install_dev; | ||
| 837 | |||
| 838 | acpi_walk_dep_device_list(san); | ||
| 839 | return 0; | ||
| 840 | |||
| 841 | err_install_dev: | ||
| 842 | san_events_unregister(pdev); | ||
| 843 | err_enable_events: | ||
| 844 | acpi_remove_address_space_handler(san, ACPI_ADR_SPACE_GSBUS, | ||
| 845 | &san_opreg_handler); | ||
| 846 | return status; | ||
| 847 | } | ||
| 848 | |||
| 849 | static int san_remove(struct platform_device *pdev) | ||
| 850 | { | ||
| 851 | acpi_handle san = ACPI_HANDLE(&pdev->dev); | ||
| 852 | |||
| 853 | san_set_rqsg_interface_device(NULL); | ||
| 854 | acpi_remove_address_space_handler(san, ACPI_ADR_SPACE_GSBUS, | ||
| 855 | &san_opreg_handler); | ||
| 856 | san_events_unregister(pdev); | ||
| 857 | |||
| 858 | /* | ||
| 859 | * We have unregistered our event sources. Now we need to ensure that | ||
| 860 | * all delayed works they may have spawned are run to completion. | ||
| 861 | */ | ||
| 862 | flush_scheduled_work(); | ||
| 863 | |||
| 864 | return 0; | ||
| 865 | } | ||
| 866 | |||
| 867 | static const struct acpi_device_id san_match[] = { | ||
| 868 | { "MSHW0091" }, | ||
| 869 | { }, | ||
| 870 | }; | ||
| 871 | MODULE_DEVICE_TABLE(acpi, san_match); | ||
| 872 | |||
| 873 | static struct platform_driver surface_acpi_notify = { | ||
| 874 | .probe = san_probe, | ||
| 875 | .remove = san_remove, | ||
| 876 | .driver = { | ||
| 877 | .name = "surface_acpi_notify", | ||
| 878 | .acpi_match_table = san_match, | ||
| 879 | .probe_type = PROBE_PREFER_ASYNCHRONOUS, | ||
| 880 | }, | ||
| 881 | }; | ||
| 882 | module_platform_driver(surface_acpi_notify); | ||
| 883 | |||
| 884 | MODULE_AUTHOR("Maximilian Luz <luzmaximilian@gmail.com>"); | ||
| 885 | MODULE_DESCRIPTION("Surface ACPI Notify driver for Surface System Aggregator Module"); | ||
| 886 | MODULE_LICENSE("GPL"); | ||
| @@ -0,0 +1,322 @@ | |||
| 1 | // SPDX-License-Identifier: GPL-2.0+ | ||
| 2 | /* | ||
| 3 | * Provides user-space access to the SSAM EC via the /dev/surface/aggregator | ||
| 4 | * misc device. Intended for debugging and development. | ||
| 5 | * | ||
| 6 | * Copyright (C) 2020 Maximilian Luz <luzmaximilian@gmail.com> | ||
| 7 | */ | ||
| 8 | |||
| 9 | #include <linux/fs.h> | ||
| 10 | #include <linux/kernel.h> | ||
| 11 | #include <linux/kref.h> | ||
| 12 | #include <linux/miscdevice.h> | ||
| 13 | #include <linux/module.h> | ||
| 14 | #include <linux/platform_device.h> | ||
| 15 | #include <linux/rwsem.h> | ||
| 16 | #include <linux/slab.h> | ||
| 17 | #include <linux/uaccess.h> | ||
| 18 | |||
| 19 | #include <linux/surface_aggregator/cdev.h> | ||
| 20 | #include <linux/surface_aggregator/controller.h> | ||
| 21 | |||
| 22 | #define SSAM_CDEV_DEVICE_NAME "surface_aggregator_cdev" | ||
| 23 | |||
| 24 | struct ssam_cdev { | ||
| 25 | struct kref kref; | ||
| 26 | struct rw_semaphore lock; | ||
| 27 | struct ssam_controller *ctrl; | ||
| 28 | struct miscdevice mdev; | ||
| 29 | }; | ||
| 30 | |||
| 31 | static void __ssam_cdev_release(struct kref *kref) | ||
| 32 | { | ||
| 33 | kfree(container_of(kref, struct ssam_cdev, kref)); | ||
| 34 | } | ||
| 35 | |||
| 36 | static struct ssam_cdev *ssam_cdev_get(struct ssam_cdev *cdev) | ||
| 37 | { | ||
| 38 | if (cdev) | ||
| 39 | kref_get(&cdev->kref); | ||
| 40 | |||
| 41 | return cdev; | ||
| 42 | } | ||
| 43 | |||
| 44 | static void ssam_cdev_put(struct ssam_cdev *cdev) | ||
| 45 | { | ||
| 46 | if (cdev) | ||
| 47 | kref_put(&cdev->kref, __ssam_cdev_release); | ||
| 48 | } | ||
| 49 | |||
| 50 | static int ssam_cdev_device_open(struct inode *inode, struct file *filp) | ||
| 51 | { | ||
| 52 | struct miscdevice *mdev = filp->private_data; | ||
| 53 | struct ssam_cdev *cdev = container_of(mdev, struct ssam_cdev, mdev); | ||
| 54 | |||
| 55 | filp->private_data = ssam_cdev_get(cdev); | ||
| 56 | return stream_open(inode, filp); | ||
| 57 | } | ||
| 58 | |||
| 59 | static int ssam_cdev_device_release(struct inode *inode, struct file *filp) | ||
| 60 | { | ||
| 61 | ssam_cdev_put(filp->private_data); | ||
| 62 | return 0; | ||
| 63 | } | ||
| 64 | |||
| 65 | static long ssam_cdev_request(struct ssam_cdev *cdev, unsigned long arg) | ||
| 66 | { | ||
| 67 | struct ssam_cdev_request __user *r; | ||
| 68 | struct ssam_cdev_request rqst; | ||
| 69 | struct ssam_request spec = {}; | ||
| 70 | struct ssam_response rsp = {}; | ||
| 71 | const void __user *plddata; | ||
| 72 | void __user *rspdata; | ||
| 73 | int status = 0, ret = 0, tmp; | ||
| 74 | |||
| 75 | r = (struct ssam_cdev_request __user *)arg; | ||
| 76 | ret = copy_struct_from_user(&rqst, sizeof(rqst), r, sizeof(*r)); | ||
| 77 | if (ret) | ||
| 78 | goto out; | ||
| 79 | |||
| 80 | plddata = u64_to_user_ptr(rqst.payload.data); | ||
| 81 | rspdata = u64_to_user_ptr(rqst.response.data); | ||
| 82 | |||
| 83 | /* Setup basic request fields. */ | ||
| 84 | spec.target_category = rqst.target_category; | ||
| 85 | spec.target_id = rqst.target_id; | ||
| 86 | spec.command_id = rqst.command_id; | ||
| 87 | spec.instance_id = rqst.instance_id; | ||
| 88 | spec.flags = 0; | ||
| 89 | spec.length = rqst.payload.length; | ||
| 90 | spec.payload = NULL; | ||
| 91 | |||
| 92 | if (rqst.flags & SSAM_CDEV_REQUEST_HAS_RESPONSE) | ||
| 93 | spec.flags |= SSAM_REQUEST_HAS_RESPONSE; | ||
| 94 | |||
| 95 | if (rqst.flags & SSAM_CDEV_REQUEST_UNSEQUENCED) | ||
| 96 | spec.flags |= SSAM_REQUEST_UNSEQUENCED; | ||
| 97 | |||
| 98 | rsp.capacity = rqst.response.length; | ||
| 99 | rsp.length = 0; | ||
| 100 | rsp.pointer = NULL; | ||
| 101 | |||
| 102 | /* Get request payload from user-space. */ | ||
| 103 | if (spec.length) { | ||
| 104 | if (!plddata) { | ||
| 105 | ret = -EINVAL; | ||
| 106 | goto out; | ||
| 107 | } | ||
| 108 | |||
| 109 | /* | ||
| 110 | * Note: spec.length is limited to U16_MAX bytes via struct | ||
| 111 | * ssam_cdev_request. This is slightly larger than the | ||
| 112 | * theoretical maximum (SSH_COMMAND_MAX_PAYLOAD_SIZE) of the | ||
| 113 | * underlying protocol (note that nothing remotely this size | ||
| 114 | * should ever be allocated in any normal case). This size is | ||
| 115 | * validated later in ssam_request_sync(), for allocation the | ||
| 116 | * bound imposed by u16 should be enough. | ||
| 117 | */ | ||
| 118 | spec.payload = kzalloc(spec.length, GFP_KERNEL); | ||
| 119 | if (!spec.payload) { | ||
| 120 | ret = -ENOMEM; | ||
| 121 | goto out; | ||
| 122 | } | ||
| 123 | |||
| 124 | if (copy_from_user((void *)spec.payload, plddata, spec.length)) { | ||
| 125 | ret = -EFAULT; | ||
| 126 | goto out; | ||
| 127 | } | ||
| 128 | } | ||
| 129 | |||
| 130 | /* Allocate response buffer. */ | ||
| 131 | if (rsp.capacity) { | ||
| 132 | if (!rspdata) { | ||
| 133 | ret = -EINVAL; | ||
| 134 | goto out; | ||
| 135 | } | ||
| 136 | |||
| 137 | /* | ||
| 138 | * Note: rsp.capacity is limited to U16_MAX bytes via struct | ||
| 139 | * ssam_cdev_request. This is slightly larger than the | ||
| 140 | * theoretical maximum (SSH_COMMAND_MAX_PAYLOAD_SIZE) of the | ||
| 141 | * underlying protocol (note that nothing remotely this size | ||
| 142 | * should ever be allocated in any normal case). In later use, | ||
| 143 | * this capacity does not have to be strictly bounded, as it | ||
| 144 | * is only used as an output buffer to be written to. For | ||
| 145 | * allocation the bound imposed by u16 should be enough. | ||
| 146 | */ | ||
| 147 | rsp.pointer = kzalloc(rsp.capacity, GFP_KERNEL); | ||
| 148 | if (!rsp.pointer) { | ||
| 149 | ret = -ENOMEM; | ||
| 150 | goto out; | ||
| 151 | } | ||
| 152 | } | ||
| 153 | |||
| 154 | /* Perform request. */ | ||
| 155 | status = ssam_request_sync(cdev->ctrl, &spec, &rsp); | ||
| 156 | if (status) | ||
| 157 | goto out; | ||
| 158 | |||
| 159 | /* Copy response to user-space. */ | ||
| 160 | if (rsp.length && copy_to_user(rspdata, rsp.pointer, rsp.length)) | ||
| 161 | ret = -EFAULT; | ||
| 162 | |||
| 163 | out: | ||
| 164 | /* Always try to set response-length and status. */ | ||
| 165 | tmp = put_user(rsp.length, &r->response.length); | ||
| 166 | if (tmp) | ||
| 167 | ret = tmp; | ||
| 168 | |||
| 169 | tmp = put_user(status, &r->status); | ||
| 170 | if (tmp) | ||
| 171 | ret = tmp; | ||
| 172 | |||
| 173 | /* Cleanup. */ | ||
| 174 | kfree(spec.payload); | ||
| 175 | kfree(rsp.pointer); | ||
| 176 | |||
| 177 | return ret; | ||
| 178 | } | ||
| 179 | |||
| 180 | static long __ssam_cdev_device_ioctl(struct ssam_cdev *cdev, unsigned int cmd, | ||
| 181 | unsigned long arg) | ||
| 182 | { | ||
| 183 | switch (cmd) { | ||
| 184 | case SSAM_CDEV_REQUEST: | ||
| 185 | return ssam_cdev_request(cdev, arg); | ||
| 186 | |||
| 187 | default: | ||
| 188 | return -ENOTTY; | ||
| 189 | } | ||
| 190 | } | ||
| 191 | |||
| 192 | static long ssam_cdev_device_ioctl(struct file *file, unsigned int cmd, | ||
| 193 | unsigned long arg) | ||
| 194 | { | ||
| 195 | struct ssam_cdev *cdev = file->private_data; | ||
| 196 | long status; | ||
| 197 | |||
| 198 | /* Ensure that controller is valid for as long as we need it. */ | ||
| 199 | if (down_read_killable(&cdev->lock)) | ||
| 200 | return -ERESTARTSYS; | ||
| 201 | |||
| 202 | if (!cdev->ctrl) { | ||
| 203 | up_read(&cdev->lock); | ||
| 204 | return -ENODEV; | ||
| 205 | } | ||
| 206 | |||
| 207 | status = __ssam_cdev_device_ioctl(cdev, cmd, arg); | ||
| 208 | |||
| 209 | up_read(&cdev->lock); | ||
| 210 | return status; | ||
| 211 | } | ||
| 212 | |||
| 213 | static const struct file_operations ssam_controller_fops = { | ||
| 214 | .owner = THIS_MODULE, | ||
| 215 | .open = ssam_cdev_device_open, | ||
| 216 | .release = ssam_cdev_device_release, | ||
| 217 | .unlocked_ioctl = ssam_cdev_device_ioctl, | ||
| 218 | .compat_ioctl = ssam_cdev_device_ioctl, | ||
| 219 | .llseek = noop_llseek, | ||
| 220 | }; | ||
| 221 | |||
| 222 | static int ssam_dbg_device_probe(struct platform_device *pdev) | ||
| 223 | { | ||
| 224 | struct ssam_controller *ctrl; | ||
| 225 | struct ssam_cdev *cdev; | ||
| 226 | int status; | ||
| 227 | |||
| 228 | ctrl = ssam_client_bind(&pdev->dev); | ||
| 229 | if (IS_ERR(ctrl)) | ||
| 230 | return PTR_ERR(ctrl) == -ENODEV ? -EPROBE_DEFER : PTR_ERR(ctrl); | ||
| 231 | |||
| 232 | cdev = kzalloc(sizeof(*cdev), GFP_KERNEL); | ||
| 233 | if (!cdev) | ||
| 234 | return -ENOMEM; | ||
| 235 | |||
| 236 | kref_init(&cdev->kref); | ||
| 237 | init_rwsem(&cdev->lock); | ||
| 238 | cdev->ctrl = ctrl; | ||
| 239 | |||
| 240 | cdev->mdev.parent = &pdev->dev; | ||
| 241 | cdev->mdev.minor = MISC_DYNAMIC_MINOR; | ||
| 242 | cdev->mdev.name = "surface_aggregator"; | ||
| 243 | cdev->mdev.nodename = "surface/aggregator"; | ||
| 244 | cdev->mdev.fops = &ssam_controller_fops; | ||
| 245 | |||
| 246 | status = misc_register(&cdev->mdev); | ||
| 247 | if (status) { | ||
| 248 | kfree(cdev); | ||
| 249 | return status; | ||
| 250 | } | ||
| 251 | |||
| 252 | platform_set_drvdata(pdev, cdev); | ||
| 253 | return 0; | ||
| 254 | } | ||
| 255 | |||
| 256 | static int ssam_dbg_device_remove(struct platform_device *pdev) | ||
| 257 | { | ||
| 258 | struct ssam_cdev *cdev = platform_get_drvdata(pdev); | ||
| 259 | |||
| 260 | misc_deregister(&cdev->mdev); | ||
| 261 | |||
| 262 | /* | ||
| 263 | * The controller is only guaranteed to be valid for as long as the | ||
| 264 | * driver is bound. Remove controller so that any lingering open files | ||
| 265 | * cannot access it any more after we're gone. | ||
| 266 | */ | ||
| 267 | down_write(&cdev->lock); | ||
| 268 | cdev->ctrl = NULL; | ||
| 269 | up_write(&cdev->lock); | ||
| 270 | |||
| 271 | ssam_cdev_put(cdev); | ||
| 272 | return 0; | ||
| 273 | } | ||
| 274 | |||
| 275 | static struct platform_device *ssam_cdev_device; | ||
| 276 | |||
| 277 | static struct platform_driver ssam_cdev_driver = { | ||
| 278 | .probe = ssam_dbg_device_probe, | ||
| 279 | .remove = ssam_dbg_device_remove, | ||
| 280 | .driver = { | ||
| 281 | .name = SSAM_CDEV_DEVICE_NAME, | ||
| 282 | .probe_type = PROBE_PREFER_ASYNCHRONOUS, | ||
| 283 | }, | ||
| 284 | }; | ||
| 285 | |||
| 286 | static int __init ssam_debug_init(void) | ||
| 287 | { | ||
| 288 | int status; | ||
| 289 | |||
| 290 | ssam_cdev_device = platform_device_alloc(SSAM_CDEV_DEVICE_NAME, | ||
| 291 | PLATFORM_DEVID_NONE); | ||
| 292 | if (!ssam_cdev_device) | ||
| 293 | return -ENOMEM; | ||
| 294 | |||
| 295 | status = platform_device_add(ssam_cdev_device); | ||
| 296 | if (status) | ||
| 297 | goto err_device; | ||
| 298 | |||
| 299 | status = platform_driver_register(&ssam_cdev_driver); | ||
| 300 | if (status) | ||
| 301 | goto err_driver; | ||
| 302 | |||
| 303 | return 0; | ||
| 304 | |||
| 305 | err_driver: | ||
| 306 | platform_device_del(ssam_cdev_device); | ||
| 307 | err_device: | ||
| 308 | platform_device_put(ssam_cdev_device); | ||
| 309 | return status; | ||
| 310 | } | ||
| 311 | module_init(ssam_debug_init); | ||
| 312 | |||
| 313 | static void __exit ssam_debug_exit(void) | ||
| 314 | { | ||
| 315 | platform_driver_unregister(&ssam_cdev_driver); | ||
| 316 | platform_device_unregister(ssam_cdev_device); | ||
| 317 | } | ||
| 318 | module_exit(ssam_debug_exit); | ||
| 319 | |||
| 320 | MODULE_AUTHOR("Maximilian Luz <luzmaximilian@gmail.com>"); | ||
| 321 | MODULE_DESCRIPTION("User-space interface for Surface System Aggregator Module"); | ||
| 322 | MODULE_LICENSE("GPL"); | ||
| @@ -0,0 +1,282 @@ | |||
| 1 | // SPDX-License-Identifier: GPL-2.0+ | ||
| 2 | /* | ||
| 3 | * Surface Book (2 and later) hot-plug driver. | ||
| 4 | * | ||
| 5 | * Surface Book devices (can) have a hot-pluggable discrete GPU (dGPU). This | ||
| 6 | * driver is responsible for out-of-band hot-plug event signaling on these | ||
| 7 | * devices. It is specifically required when the hot-plug device is in D3cold | ||
| 8 | * and can thus not generate PCIe hot-plug events itself. | ||
| 9 | * | ||
| 10 | * Event signaling is handled via ACPI, which will generate the appropriate | ||
| 11 | * device-check notifications to be picked up by the PCIe hot-plug driver. | ||
| 12 | * | ||
| 13 | * Copyright (C) 2019-2021 Maximilian Luz <luzmaximilian@gmail.com> | ||
| 14 | */ | ||
| 15 | |||
| 16 | #include <linux/acpi.h> | ||
| 17 | #include <linux/gpio.h> | ||
| 18 | #include <linux/interrupt.h> | ||
| 19 | #include <linux/kernel.h> | ||
| 20 | #include <linux/module.h> | ||
| 21 | #include <linux/mutex.h> | ||
| 22 | #include <linux/platform_device.h> | ||
| 23 | |||
| 24 | static const struct acpi_gpio_params shps_base_presence_int = { 0, 0, false }; | ||
| 25 | static const struct acpi_gpio_params shps_base_presence = { 1, 0, false }; | ||
| 26 | static const struct acpi_gpio_params shps_device_power_int = { 2, 0, false }; | ||
| 27 | static const struct acpi_gpio_params shps_device_power = { 3, 0, false }; | ||
| 28 | static const struct acpi_gpio_params shps_device_presence_int = { 4, 0, false }; | ||
| 29 | static const struct acpi_gpio_params shps_device_presence = { 5, 0, false }; | ||
| 30 | |||
| 31 | static const struct acpi_gpio_mapping shps_acpi_gpios[] = { | ||
| 32 | { "base_presence-int-gpio", &shps_base_presence_int, 1 }, | ||
| 33 | { "base_presence-gpio", &shps_base_presence, 1 }, | ||
| 34 | { "device_power-int-gpio", &shps_device_power_int, 1 }, | ||
| 35 | { "device_power-gpio", &shps_device_power, 1 }, | ||
| 36 | { "device_presence-int-gpio", &shps_device_presence_int, 1 }, | ||
| 37 | { "device_presence-gpio", &shps_device_presence, 1 }, | ||
| 38 | { }, | ||
| 39 | }; | ||
| 40 | |||
| 41 | /* 5515a847-ed55-4b27-8352-cd320e10360a */ | ||
| 42 | static const guid_t shps_dsm_guid = | ||
| 43 | GUID_INIT(0x5515a847, 0xed55, 0x4b27, 0x83, 0x52, 0xcd, 0x32, 0x0e, 0x10, 0x36, 0x0a); | ||
| 44 | |||
| 45 | #define SHPS_DSM_REVISION 1 | ||
| 46 | |||
| 47 | enum shps_dsm_fn { | ||
| 48 | SHPS_DSM_FN_PCI_NUM_ENTRIES = 0x01, | ||
| 49 | SHPS_DSM_FN_PCI_GET_ENTRIES = 0x02, | ||
| 50 | SHPS_DSM_FN_IRQ_BASE_PRESENCE = 0x03, | ||
| 51 | SHPS_DSM_FN_IRQ_DEVICE_POWER = 0x04, | ||
| 52 | SHPS_DSM_FN_IRQ_DEVICE_PRESENCE = 0x05, | ||
| 53 | }; | ||
| 54 | |||
| 55 | enum shps_irq_type { | ||
| 56 | /* NOTE: Must be in order of enum shps_dsm_fn above. */ | ||
| 57 | SHPS_IRQ_TYPE_BASE_PRESENCE = 0, | ||
| 58 | SHPS_IRQ_TYPE_DEVICE_POWER = 1, | ||
| 59 | SHPS_IRQ_TYPE_DEVICE_PRESENCE = 2, | ||
| 60 | SHPS_NUM_IRQS, | ||
| 61 | }; | ||
| 62 | |||
| 63 | static const char *const shps_gpio_names[] = { | ||
| 64 | [SHPS_IRQ_TYPE_BASE_PRESENCE] = "base_presence", | ||
| 65 | [SHPS_IRQ_TYPE_DEVICE_POWER] = "device_power", | ||
| 66 | [SHPS_IRQ_TYPE_DEVICE_PRESENCE] = "device_presence", | ||
| 67 | }; | ||
| 68 | |||
| 69 | struct shps_device { | ||
| 70 | struct mutex lock[SHPS_NUM_IRQS]; /* Protects update in shps_dsm_notify_irq() */ | ||
| 71 | struct gpio_desc *gpio[SHPS_NUM_IRQS]; | ||
| 72 | unsigned int irq[SHPS_NUM_IRQS]; | ||
| 73 | }; | ||
| 74 | |||
| 75 | #define SHPS_IRQ_NOT_PRESENT ((unsigned int)-1) | ||
| 76 | |||
| 77 | static enum shps_dsm_fn shps_dsm_fn_for_irq(enum shps_irq_type type) | ||
| 78 | { | ||
| 79 | return SHPS_DSM_FN_IRQ_BASE_PRESENCE + type; | ||
| 80 | } | ||
| 81 | |||
| 82 | static void shps_dsm_notify_irq(struct platform_device *pdev, enum shps_irq_type type) | ||
| 83 | { | ||
| 84 | struct shps_device *sdev = platform_get_drvdata(pdev); | ||
| 85 | acpi_handle handle = ACPI_HANDLE(&pdev->dev); | ||
| 86 | union acpi_object *result; | ||
| 87 | union acpi_object param; | ||
| 88 | int value; | ||
| 89 | |||
| 90 | mutex_lock(&sdev->lock[type]); | ||
| 91 | |||
| 92 | value = gpiod_get_value_cansleep(sdev->gpio[type]); | ||
| 93 | if (value < 0) { | ||
| 94 | mutex_unlock(&sdev->lock[type]); | ||
| 95 | dev_err(&pdev->dev, "failed to get gpio: %d (irq=%d)\n", type, value); | ||
| 96 | return; | ||
| 97 | } | ||
| 98 | |||
| 99 | dev_dbg(&pdev->dev, "IRQ notification via DSM (irq=%d, value=%d)\n", type, value); | ||
| 100 | |||
| 101 | param.type = ACPI_TYPE_INTEGER; | ||
| 102 | param.integer.value = value; | ||
| 103 | |||
| 104 | result = acpi_evaluate_dsm(handle, &shps_dsm_guid, SHPS_DSM_REVISION, | ||
| 105 | shps_dsm_fn_for_irq(type), ¶m); | ||
| 106 | |||
| 107 | if (!result) { | ||
| 108 | dev_err(&pdev->dev, "IRQ notification via DSM failed (irq=%d, gpio=%d)\n", | ||
| 109 | type, value); | ||
| 110 | |||
| 111 | } else if (result->type != ACPI_TYPE_BUFFER) { | ||
| 112 | dev_err(&pdev->dev, | ||
| 113 | "IRQ notification via DSM failed: unexpected result type (irq=%d, gpio=%d)\n", | ||
| 114 | type, value); | ||
| 115 | |||
| 116 | } else if (result->buffer.length != 1 || result->buffer.pointer[0] != 0) { | ||
| 117 | dev_err(&pdev->dev, | ||
| 118 | "IRQ notification via DSM failed: unexpected result value (irq=%d, gpio=%d)\n", | ||
| 119 | type, value); | ||
| 120 | } | ||
| 121 | |||
| 122 | mutex_unlock(&sdev->lock[type]); | ||
| 123 | |||
| 124 | if (result) | ||
| 125 | ACPI_FREE(result); | ||
| 126 | } | ||
| 127 | |||
| 128 | static irqreturn_t shps_handle_irq(int irq, void *data) | ||
| 129 | { | ||
| 130 | struct platform_device *pdev = data; | ||
| 131 | struct shps_device *sdev = platform_get_drvdata(pdev); | ||
| 132 | int type; | ||
| 133 | |||
| 134 | /* Figure out which IRQ we're handling. */ | ||
| 135 | for (type = 0; type < SHPS_NUM_IRQS; type++) | ||
| 136 | if (irq == sdev->irq[type]) | ||
| 137 | break; | ||
| 138 | |||
| 139 | /* We should have found our interrupt, if not: this is a bug. */ | ||
| 140 | if (WARN(type >= SHPS_NUM_IRQS, "invalid IRQ number: %d\n", irq)) | ||
| 141 | return IRQ_HANDLED; | ||
| 142 | |||
| 143 | /* Forward interrupt to ACPI via DSM. */ | ||
| 144 | shps_dsm_notify_irq(pdev, type); | ||
| 145 | return IRQ_HANDLED; | ||
| 146 | } | ||
| 147 | |||
| 148 | static int shps_setup_irq(struct platform_device *pdev, enum shps_irq_type type) | ||
| 149 | { | ||
| 150 | unsigned long flags = IRQF_ONESHOT | IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING; | ||
| 151 | struct shps_device *sdev = platform_get_drvdata(pdev); | ||
| 152 | struct gpio_desc *gpiod; | ||
| 153 | acpi_handle handle = ACPI_HANDLE(&pdev->dev); | ||
| 154 | const char *irq_name; | ||
| 155 | const int dsm = shps_dsm_fn_for_irq(type); | ||
| 156 | int status, irq; | ||
| 157 | |||
| 158 | /* | ||
| 159 | * Only set up interrupts that we actually need: The Surface Book 3 | ||
| 160 | * does not have a DSM for base presence, so don't set up an interrupt | ||
| 161 | * for that. | ||
| 162 | */ | ||
| 163 | if (!acpi_check_dsm(handle, &shps_dsm_guid, SHPS_DSM_REVISION, BIT(dsm))) { | ||
| 164 | dev_dbg(&pdev->dev, "IRQ notification via DSM not present (irq=%d)\n", type); | ||
| 165 | return 0; | ||
| 166 | } | ||
| 167 | |||
| 168 | gpiod = devm_gpiod_get(&pdev->dev, shps_gpio_names[type], GPIOD_ASIS); | ||
| 169 | if (IS_ERR(gpiod)) | ||
| 170 | return PTR_ERR(gpiod); | ||
| 171 | |||
| 172 | irq = gpiod_to_irq(gpiod); | ||
| 173 | if (irq < 0) | ||
| 174 | return irq; | ||
| 175 | |||
| 176 | irq_name = devm_kasprintf(&pdev->dev, GFP_KERNEL, "shps-irq-%d", type); | ||
| 177 | if (!irq_name) | ||
| 178 | return -ENOMEM; | ||
| 179 | |||
| 180 | status = devm_request_threaded_irq(&pdev->dev, irq, NULL, shps_handle_irq, | ||
| 181 | flags, irq_name, pdev); | ||
| 182 | if (status) | ||
| 183 | return status; | ||
| 184 | |||
| 185 | dev_dbg(&pdev->dev, "set up irq %d as type %d\n", irq, type); | ||
| 186 | |||
| 187 | sdev->gpio[type] = gpiod; | ||
| 188 | sdev->irq[type] = irq; | ||
| 189 | |||
| 190 | return 0; | ||
| 191 | } | ||
| 192 | |||
| 193 | static int surface_hotplug_remove(struct platform_device *pdev) | ||
| 194 | { | ||
| 195 | struct shps_device *sdev = platform_get_drvdata(pdev); | ||
| 196 | int i; | ||
| 197 | |||
| 198 | /* Ensure that IRQs have been fully handled and won't trigger any more. */ | ||
| 199 | for (i = 0; i < SHPS_NUM_IRQS; i++) { | ||
| 200 | if (sdev->irq[i] != SHPS_IRQ_NOT_PRESENT) | ||
| 201 | disable_irq(sdev->irq[i]); | ||
| 202 | |||
| 203 | mutex_destroy(&sdev->lock[i]); | ||
| 204 | } | ||
| 205 | |||
| 206 | return 0; | ||
| 207 | } | ||
| 208 | |||
| 209 | static int surface_hotplug_probe(struct platform_device *pdev) | ||
| 210 | { | ||
| 211 | struct shps_device *sdev; | ||
| 212 | int status, i; | ||
| 213 | |||
| 214 | /* | ||
| 215 | * The MSHW0153 device is also present on the Surface Laptop 3, | ||
| 216 | * however that doesn't have a hot-pluggable PCIe device. It also | ||
| 217 | * doesn't have any GPIO interrupts/pins under the MSHW0153, so filter | ||
| 218 | * it out here. | ||
| 219 | */ | ||
| 220 | if (gpiod_count(&pdev->dev, NULL) < 0) | ||
| 221 | return -ENODEV; | ||
| 222 | |||
| 223 | status = devm_acpi_dev_add_driver_gpios(&pdev->dev, shps_acpi_gpios); | ||
| 224 | if (status) | ||
| 225 | return status; | ||
| 226 | |||
| 227 | sdev = devm_kzalloc(&pdev->dev, sizeof(*sdev), GFP_KERNEL); | ||
| 228 | if (!sdev) | ||
| 229 | return -ENOMEM; | ||
| 230 | |||
| 231 | platform_set_drvdata(pdev, sdev); | ||
| 232 | |||
| 233 | /* | ||
| 234 | * Initialize IRQs so that we can safely call surface_hotplug_remove() | ||
| 235 | * on errors. | ||
| 236 | */ | ||
| 237 | for (i = 0; i < SHPS_NUM_IRQS; i++) | ||
| 238 | sdev->irq[i] = SHPS_IRQ_NOT_PRESENT; | ||
| 239 | |||
| 240 | /* Set up IRQs. */ | ||
| 241 | for (i = 0; i < SHPS_NUM_IRQS; i++) { | ||
| 242 | mutex_init(&sdev->lock[i]); | ||
| 243 | |||
| 244 | status = shps_setup_irq(pdev, i); | ||
| 245 | if (status) { | ||
| 246 | dev_err(&pdev->dev, "failed to set up IRQ %d: %d\n", i, status); | ||
| 247 | goto err; | ||
| 248 | } | ||
| 249 | } | ||
| 250 | |||
| 251 | /* Ensure everything is up-to-date. */ | ||
| 252 | for (i = 0; i < SHPS_NUM_IRQS; i++) | ||
| 253 | if (sdev->irq[i] != SHPS_IRQ_NOT_PRESENT) | ||
| 254 | shps_dsm_notify_irq(pdev, i); | ||
| 255 | |||
| 256 | return 0; | ||
| 257 | |||
| 258 | err: | ||
| 259 | surface_hotplug_remove(pdev); | ||
| 260 | return status; | ||
| 261 | } | ||
| 262 | |||
| 263 | static const struct acpi_device_id surface_hotplug_acpi_match[] = { | ||
| 264 | { "MSHW0153", 0 }, | ||
| 265 | { }, | ||
| 266 | }; | ||
| 267 | MODULE_DEVICE_TABLE(acpi, surface_hotplug_acpi_match); | ||
| 268 | |||
| 269 | static struct platform_driver surface_hotplug_driver = { | ||
| 270 | .probe = surface_hotplug_probe, | ||
| 271 | .remove = surface_hotplug_remove, | ||
| 272 | .driver = { | ||
| 273 | .name = "surface_hotplug", | ||
| 274 | .acpi_match_table = surface_hotplug_acpi_match, | ||
| 275 | .probe_type = PROBE_PREFER_ASYNCHRONOUS, | ||
| 276 | }, | ||
| 277 | }; | ||
| 278 | module_platform_driver(surface_hotplug_driver); | ||
| 279 | |||
| 280 | MODULE_AUTHOR("Maximilian Luz <luzmaximilian@gmail.com>"); | ||
| 281 | MODULE_DESCRIPTION("Surface Hot-Plug Signaling Driver for Surface Book Devices"); | ||
| 282 | MODULE_LICENSE("GPL"); | ||
| @@ -49,18 +49,6 @@ config WMI_BMOF · 48 unmodified lines | |||
| 49 | To compile this driver as a module, choose M here: the module will | 49 | To compile this driver as a module, choose M here: the module will |
| 50 | be called wmi-bmof. | 50 | be called wmi-bmof. |
| 51 | 51 | ||
| 52 | config ALIENWARE_WMI | ||
| 53 | tristate "Alienware Special feature control" | ||
| 54 | depends on ACPI | ||
| 55 | depends on LEDS_CLASS | ||
| 56 | depends on NEW_LEDS | ||
| 57 | depends on ACPI_WMI | ||
| 58 | help | ||
| 59 | This is a driver for controlling Alienware BIOS driven | ||
| 60 | features. It exposes an interface for controlling the AlienFX | ||
| 61 | zones on Alienware machines that don't contain a dedicated AlienFX | ||
| 62 | USB MCU such as the X51 and X51-R2. | ||
| 63 | |||
| 64 | config HUAWEI_WMI | 52 | config HUAWEI_WMI |
| 65 | tristate "Huawei WMI laptop extras driver" | 53 | tristate "Huawei WMI laptop extras driver" |
| 66 | depends on ACPI_BATTERY | 54 | depends on ACPI_BATTERY |
| @@ -327,169 +315,7 @@ config EEEPC_WMI · 260 unmodified lines | |||
| 327 | If you have an ACPI-WMI compatible Eee PC laptop (>= 1000), say Y or M | 315 | If you have an ACPI-WMI compatible Eee PC laptop (>= 1000), say Y or M |
| 328 | here. | 316 | here. |
| 329 | 317 | ||
| 330 | config DCDBAS | 318 | source "drivers/platform/x86/dell/Kconfig" |
| 331 | tristate "Dell Systems Management Base Driver" | ||
| 332 | depends on X86 | ||
| 333 | help | ||
| 334 | The Dell Systems Management Base Driver provides a sysfs interface | ||
| 335 | for systems management software to perform System Management | ||
| 336 | Interrupts (SMIs) and Host Control Actions (system power cycle or | ||
| 337 | power off after OS shutdown) on certain Dell systems. | ||
| 338 | |||
| 339 | See <file:Documentation/driver-api/dcdbas.rst> for more details on the driver | ||
| 340 | and the Dell systems on which Dell systems management software makes | ||
| 341 | use of this driver. | ||
| 342 | |||
| 343 | Say Y or M here to enable the driver for use by Dell systems | ||
| 344 | management software such as Dell OpenManage. | ||
| 345 | |||
| 346 | # | ||
| 347 | # The DELL_SMBIOS driver depends on ACPI_WMI and/or DCDBAS if those | ||
| 348 | # backends are selected. The "depends" line prevents a configuration | ||
| 349 | # where DELL_SMBIOS=y while either of those dependencies =m. | ||
| 350 | # | ||
| 351 | config DELL_SMBIOS | ||
| 352 | tristate "Dell SMBIOS driver" | ||
| 353 | depends on DCDBAS || DCDBAS=n | ||
| 354 | depends on ACPI_WMI || ACPI_WMI=n | ||
| 355 | help | ||
| 356 | This provides support for the Dell SMBIOS calling interface. | ||
| 357 | If you have a Dell computer you should enable this option. | ||
| 358 | |||
| 359 | Be sure to select at least one backend for it to work properly. | ||
| 360 | |||
| 361 | config DELL_SMBIOS_WMI | ||
| 362 | bool "Dell SMBIOS driver WMI backend" | ||
| 363 | default y | ||
| 364 | depends on ACPI_WMI | ||
| 365 | select DELL_WMI_DESCRIPTOR | ||
| 366 | depends on DELL_SMBIOS | ||
| 367 | help | ||
| 368 | This provides an implementation for the Dell SMBIOS calling interface | ||
| 369 | communicated over ACPI-WMI. | ||
| 370 | |||
| 371 | If you have a Dell computer from >2007 you should say Y here. | ||
| 372 | If you aren't sure and this module doesn't work for your computer | ||
| 373 | it just won't load. | ||
| 374 | |||
| 375 | config DELL_SMBIOS_SMM | ||
| 376 | bool "Dell SMBIOS driver SMM backend" | ||
| 377 | default y | ||
| 378 | depends on DCDBAS | ||
| 379 | depends on DELL_SMBIOS | ||
| 380 | help | ||
| 381 | This provides an implementation for the Dell SMBIOS calling interface | ||
| 382 | communicated over SMI/SMM. | ||
| 383 | |||
| 384 | If you have a Dell computer from <=2017 you should say Y here. | ||
| 385 | If you aren't sure and this module doesn't work for your computer | ||
| 386 | it just won't load. | ||
| 387 | |||
| 388 | config DELL_LAPTOP | ||
| 389 | tristate "Dell Laptop Extras" | ||
| 390 | depends on DMI | ||
| 391 | depends on BACKLIGHT_CLASS_DEVICE | ||
| 392 | depends on ACPI_VIDEO || ACPI_VIDEO = n | ||
| 393 | depends on RFKILL || RFKILL = n | ||
| 394 | depends on SERIO_I8042 | ||
| 395 | depends on DELL_SMBIOS | ||
| 396 | select POWER_SUPPLY | ||
| 397 | select LEDS_CLASS | ||
| 398 | select NEW_LEDS | ||
| 399 | select LEDS_TRIGGERS | ||
| 400 | select LEDS_TRIGGER_AUDIO | ||
| 401 | help | ||
| 402 | This driver adds support for rfkill and backlight control to Dell | ||
| 403 | laptops (except for some models covered by the Compal driver). | ||
| 404 | |||
| 405 | config DELL_RBTN | ||
| 406 | tristate "Dell Airplane Mode Switch driver" | ||
| 407 | depends on ACPI | ||
| 408 | depends on INPUT | ||
| 409 | depends on RFKILL | ||
| 410 | help | ||
| 411 | Say Y here if you want to support Dell Airplane Mode Switch ACPI | ||
| 412 | device on Dell laptops. Sometimes it has names: DELLABCE or DELRBTN. | ||
| 413 | This driver register rfkill device or input hotkey device depending | ||
| 414 | on hardware type (hw switch slider or keyboard toggle button). For | ||
| 415 | rfkill devices it receive HW switch events and set correct hard | ||
| 416 | rfkill state. | ||
| 417 | |||
| 418 | To compile this driver as a module, choose M here: the module will | ||
| 419 | be called dell-rbtn. | ||
| 420 | |||
| 421 | config DELL_RBU | ||
| 422 | tristate "BIOS update support for DELL systems via sysfs" | ||
| 423 | depends on X86 | ||
| 424 | select FW_LOADER | ||
| 425 | select FW_LOADER_USER_HELPER | ||
| 426 | help | ||
| 427 | Say m if you want to have the option of updating the BIOS for your | ||
| 428 | DELL system. Note you need a Dell OpenManage or Dell Update package (DUP) | ||
| 429 | supporting application to communicate with the BIOS regarding the new | ||
| 430 | image for the image update to take effect. | ||
| 431 | See <file:Documentation/admin-guide/dell_rbu.rst> for more details on the driver. | ||
| 432 | |||
| 433 | config DELL_SMO8800 | ||
| 434 | tristate "Dell Latitude freefall driver (ACPI SMO88XX)" | ||
| 435 | depends on ACPI | ||
| 436 | help | ||
| 437 | Say Y here if you want to support SMO88XX freefall devices | ||
| 438 | on Dell Latitude laptops. | ||
| 439 | |||
| 440 | To compile this driver as a module, choose M here: the module will | ||
| 441 | be called dell-smo8800. | ||
| 442 | |||
| 443 | config DELL_WMI | ||
| 444 | tristate "Dell WMI notifications" | ||
| 445 | depends on ACPI_WMI | ||
| 446 | depends on DMI | ||
| 447 | depends on INPUT | ||
| 448 | depends on ACPI_VIDEO || ACPI_VIDEO = n | ||
| 449 | depends on DELL_SMBIOS | ||
| 450 | select DELL_WMI_DESCRIPTOR | ||
| 451 | select INPUT_SPARSEKMAP | ||
| 452 | help | ||
| 453 | Say Y here if you want to support WMI-based hotkeys on Dell laptops. | ||
| 454 | |||
| 455 | To compile this driver as a module, choose M here: the module will | ||
| 456 | be called dell-wmi. | ||
| 457 | |||
| 458 | config DELL_WMI_SYSMAN | ||
| 459 | tristate "Dell WMI-based Systems management driver" | ||
| 460 | depends on ACPI_WMI | ||
| 461 | depends on DMI | ||
| 462 | select NLS | ||
| 463 | help | ||
| 464 | This driver allows changing BIOS settings on many Dell machines from | ||
| 465 | 2018 and newer without the use of any additional software. | ||
| 466 | |||
| 467 | To compile this driver as a module, choose M here: the module will | ||
| 468 | be called dell-wmi-sysman. | ||
| 469 | |||
| 470 | config DELL_WMI_DESCRIPTOR | ||
| 471 | tristate | ||
| 472 | depends on ACPI_WMI | ||
| 473 | |||
| 474 | config DELL_WMI_AIO | ||
| 475 | tristate "WMI Hotkeys for Dell All-In-One series" | ||
| 476 | depends on ACPI_WMI | ||
| 477 | depends on INPUT | ||
| 478 | select INPUT_SPARSEKMAP | ||
| 479 | help | ||
| 480 | Say Y here if you want to support WMI-based hotkeys on Dell | ||
| 481 | All-In-One machines. | ||
| 482 | |||
| 483 | To compile this driver as a module, choose M here: the module will | ||
| 484 | be called dell-wmi-aio. | ||
| 485 | |||
| 486 | config DELL_WMI_LED | ||
| 487 | tristate "External LED on Dell Business Netbooks" | ||
| 488 | depends on LEDS_CLASS | ||
| 489 | depends on ACPI_WMI | ||
| 490 | help | ||
| 491 | This adds support for the Latitude 2100 and similar | ||
| 492 | notebooks that have an external LED. | ||
| 493 | 319 | ||
| 494 | config AMILO_RFKILL | 320 | config AMILO_RFKILL |
| 495 | tristate "Fujitsu-Siemens Amilo rfkill support" | 321 | tristate "Fujitsu-Siemens Amilo rfkill support" |
| @@ -624,7 +450,10 @@ config IDEAPAD_LAPTOP · 128 unmodified lines | |||
| 624 | depends on BACKLIGHT_CLASS_DEVICE | 450 | depends on BACKLIGHT_CLASS_DEVICE |
| 625 | depends on ACPI_VIDEO || ACPI_VIDEO = n | 451 | depends on ACPI_VIDEO || ACPI_VIDEO = n |
| 626 | depends on ACPI_WMI || ACPI_WMI = n | 452 | depends on ACPI_WMI || ACPI_WMI = n |
| 453 | depends on ACPI_PLATFORM_PROFILE | ||
| 627 | select INPUT_SPARSEKMAP | 454 | select INPUT_SPARSEKMAP |
| 455 | select NEW_LEDS | ||
| 456 | select LEDS_CLASS | ||
| 628 | help | 457 | help |
| 629 | This is a driver for Lenovo IdeaPad netbooks contains drivers for | 458 | This is a driver for Lenovo IdeaPad netbooks contains drivers for |
| 630 | rfkill switch, hotkey, fan control and backlight control. | 459 | rfkill switch, hotkey, fan control and backlight control. |
| @@ -655,6 +484,7 @@ config THINKPAD_ACPI · 24 unmodified lines | |||
| 655 | depends on RFKILL || RFKILL = n | 484 | depends on RFKILL || RFKILL = n |
| 656 | depends on ACPI_VIDEO || ACPI_VIDEO = n | 485 | depends on ACPI_VIDEO || ACPI_VIDEO = n |
| 657 | depends on BACKLIGHT_CLASS_DEVICE | 486 | depends on BACKLIGHT_CLASS_DEVICE |
| 487 | depends on ACPI_PLATFORM_PROFILE | ||
| 658 | select HWMON | 488 | select HWMON |
| 659 | select NVRAM | 489 | select NVRAM |
| 660 | select NEW_LEDS | 490 | select NEW_LEDS |
| @@ -1327,21 +1157,6 @@ config INTEL_CHTDC_TI_PWRBTN · 666 unmodified lines | |||
| 1327 | To compile this driver as a module, choose M here: the module | 1157 | To compile this driver as a module, choose M here: the module |
| 1328 | will be called intel_chtdc_ti_pwrbtn. | 1158 | will be called intel_chtdc_ti_pwrbtn. |
| 1329 | 1159 | ||
| 1330 | config INTEL_MFLD_THERMAL | ||
| 1331 | tristate "Thermal driver for Intel Medfield platform" | ||
| 1332 | depends on MFD_INTEL_MSIC && THERMAL | ||
| 1333 | help | ||
| 1334 | Say Y here to enable thermal driver support for the Intel Medfield | ||
| 1335 | platform. | ||
| 1336 | |||
| 1337 | config INTEL_MID_POWER_BUTTON | ||
| 1338 | tristate "power button driver for Intel MID platforms" | ||
| 1339 | depends on INTEL_SCU && INPUT | ||
| 1340 | help | ||
| 1341 | This driver handles the power button on the Intel MID platforms. | ||
| 1342 | |||
| 1343 | If unsure, say N. | ||
| 1344 | |||
| 1345 | config INTEL_MRFLD_PWRBTN | 1160 | config INTEL_MRFLD_PWRBTN |
| 1346 | tristate "Intel Merrifield Basin Cove power button driver" | 1161 | tristate "Intel Merrifield Basin Cove power button driver" |
| 1347 | depends on INTEL_SOC_PMIC_MRFLD | 1162 | depends on INTEL_SOC_PMIC_MRFLD |
| @@ -1369,7 +1184,7 @@ config INTEL_PMC_CORE · 21 unmodified lines | |||
| 1369 | - MPHY/PLL gating status (Sunrisepoint PCH only) | 1184 | - MPHY/PLL gating status (Sunrisepoint PCH only) |
| 1370 | 1185 | ||
| 1371 | config INTEL_PMT_CLASS | 1186 | config INTEL_PMT_CLASS |
| 1372 | tristate "Intel Platform Monitoring Technology (PMT) Class driver" | 1187 | tristate |
| 1373 | help | 1188 | help |
| 1374 | The Intel Platform Monitoring Technology (PMT) class driver provides | 1189 | The Intel Platform Monitoring Technology (PMT) class driver provides |
| 1375 | the basic sysfs interface and file hierarchy uses by PMT devices. | 1190 | the basic sysfs interface and file hierarchy uses by PMT devices. |
| @@ -1382,6 +1197,7 @@ config INTEL_PMT_CLASS · 6 unmodified lines | |||
| 1382 | 1197 | ||
| 1383 | config INTEL_PMT_TELEMETRY | 1198 | config INTEL_PMT_TELEMETRY |
| 1384 | tristate "Intel Platform Monitoring Technology (PMT) Telemetry driver" | 1199 | tristate "Intel Platform Monitoring Technology (PMT) Telemetry driver" |
| 1200 | depends on MFD_INTEL_PMT | ||
| 1385 | select INTEL_PMT_CLASS | 1201 | select INTEL_PMT_CLASS |
| 1386 | help | 1202 | help |
| 1387 | The Intel Platform Monitory Technology (PMT) Telemetry driver provides | 1203 | The Intel Platform Monitory Technology (PMT) Telemetry driver provides |
| @@ -1393,6 +1209,7 @@ config INTEL_PMT_TELEMETRY · 5 unmodified lines | |||
| 1393 | 1209 | ||
| 1394 | config INTEL_PMT_CRASHLOG | 1210 | config INTEL_PMT_CRASHLOG |
| 1395 | tristate "Intel Platform Monitoring Technology (PMT) Crashlog driver" | 1211 | tristate "Intel Platform Monitoring Technology (PMT) Crashlog driver" |
| 1212 | depends on MFD_INTEL_PMT | ||
| 1396 | select INTEL_PMT_CLASS | 1213 | select INTEL_PMT_CLASS |
| 1397 | help | 1214 | help |
| 1398 | The Intel Platform Monitoring Technology (PMT) crashlog driver provides | 1215 | The Intel Platform Monitoring Technology (PMT) crashlog driver provides |
| @@ -1439,6 +1256,14 @@ config INTEL_SCU_PLATFORM · 40 unmodified lines | |||
| 1439 | and SCU (sometimes called PMC as well). The driver currently | 1256 | and SCU (sometimes called PMC as well). The driver currently |
| 1440 | supports Intel Elkhart Lake and compatible platforms. | 1257 | supports Intel Elkhart Lake and compatible platforms. |
| 1441 | 1258 | ||
| 1259 | config INTEL_SCU_WDT | ||
| 1260 | bool | ||
| 1261 | default INTEL_SCU_PCI | ||
| 1262 | depends on INTEL_MID_WATCHDOG | ||
| 1263 | help | ||
| 1264 | This is a specific platform code to instantiate watchdog device | ||
| 1265 | on ACPI-based Intel MID platforms. | ||
| 1266 | |||
| 1442 | config INTEL_SCU_IPC_UTIL | 1267 | config INTEL_SCU_IPC_UTIL |
| 1443 | tristate "Intel SCU IPC utility driver" | 1268 | tristate "Intel SCU IPC utility driver" |
| 1444 | depends on INTEL_SCU | 1269 | depends on INTEL_SCU |
| @@ -9,7 +9,6 @@ obj-$(CONFIG_ACPI_WMI) += wmi.o · 8 unmodified lines | |||
| 9 | obj-$(CONFIG_WMI_BMOF) += wmi-bmof.o | 9 | obj-$(CONFIG_WMI_BMOF) += wmi-bmof.o |
| 10 | 10 | ||
| 11 | # WMI drivers | 11 | # WMI drivers |
| 12 | obj-$(CONFIG_ALIENWARE_WMI) += alienware-wmi.o | ||
| 13 | obj-$(CONFIG_HUAWEI_WMI) += huawei-wmi.o | 12 | obj-$(CONFIG_HUAWEI_WMI) += huawei-wmi.o |
| 14 | obj-$(CONFIG_INTEL_WMI_SBL_FW_UPDATE) += intel-wmi-sbl-fw-update.o | 13 | obj-$(CONFIG_INTEL_WMI_SBL_FW_UPDATE) += intel-wmi-sbl-fw-update.o |
| 15 | obj-$(CONFIG_INTEL_WMI_THUNDERBOLT) += intel-wmi-thunderbolt.o | 14 | obj-$(CONFIG_INTEL_WMI_THUNDERBOLT) += intel-wmi-thunderbolt.o |
| @@ -37,20 +36,7 @@ obj-$(CONFIG_EEEPC_LAPTOP) += eeepc-laptop.o · 21 unmodified lines | |||
| 37 | obj-$(CONFIG_EEEPC_WMI) += eeepc-wmi.o | 36 | obj-$(CONFIG_EEEPC_WMI) += eeepc-wmi.o |
| 38 | 37 | ||
| 39 | # Dell | 38 | # Dell |
| 40 | obj-$(CONFIG_DCDBAS) += dcdbas.o | 39 | obj-$(CONFIG_X86_PLATFORM_DRIVERS_DELL) += dell/ |
| 41 | obj-$(CONFIG_DELL_SMBIOS) += dell-smbios.o | ||
| 42 | dell-smbios-objs := dell-smbios-base.o | ||
| 43 | dell-smbios-$(CONFIG_DELL_SMBIOS_WMI) += dell-smbios-wmi.o | ||
| 44 | dell-smbios-$(CONFIG_DELL_SMBIOS_SMM) += dell-smbios-smm.o | ||
| 45 | obj-$(CONFIG_DELL_LAPTOP) += dell-laptop.o | ||
| 46 | obj-$(CONFIG_DELL_RBTN) += dell-rbtn.o | ||
| 47 | obj-$(CONFIG_DELL_RBU) += dell_rbu.o | ||
| 48 | obj-$(CONFIG_DELL_SMO8800) += dell-smo8800.o | ||
| 49 | obj-$(CONFIG_DELL_WMI) += dell-wmi.o | ||
| 50 | obj-$(CONFIG_DELL_WMI_DESCRIPTOR) += dell-wmi-descriptor.o | ||
| 51 | obj-$(CONFIG_DELL_WMI_AIO) += dell-wmi-aio.o | ||
| 52 | obj-$(CONFIG_DELL_WMI_LED) += dell-wmi-led.o | ||
| 53 | obj-$(CONFIG_DELL_WMI_SYSMAN) += dell-wmi-sysman/ | ||
| 54 | 40 | ||
| 55 | # Fujitsu | 41 | # Fujitsu |
| 56 | obj-$(CONFIG_AMILO_RFKILL) += amilo-rfkill.o | 42 | obj-$(CONFIG_AMILO_RFKILL) += amilo-rfkill.o |
| @@ -137,8 +123,6 @@ obj-$(CONFIG_INTEL_UNCORE_FREQ_CONTROL) += intel-uncore-frequency.o · 80 unmodified lines | |||
| 137 | # Intel PMIC / PMC / P-Unit devices | 123 | # Intel PMIC / PMC / P-Unit devices |
| 138 | obj-$(CONFIG_INTEL_BXTWC_PMIC_TMU) += intel_bxtwc_tmu.o | 124 | obj-$(CONFIG_INTEL_BXTWC_PMIC_TMU) += intel_bxtwc_tmu.o |
| 139 | obj-$(CONFIG_INTEL_CHTDC_TI_PWRBTN) += intel_chtdc_ti_pwrbtn.o | 125 | obj-$(CONFIG_INTEL_CHTDC_TI_PWRBTN) += intel_chtdc_ti_pwrbtn.o |
| 140 | obj-$(CONFIG_INTEL_MFLD_THERMAL) += intel_mid_thermal.o | ||
| 141 | obj-$(CONFIG_INTEL_MID_POWER_BUTTON) += intel_mid_powerbtn.o | ||
| 142 | obj-$(CONFIG_INTEL_MRFLD_PWRBTN) += intel_mrfld_pwrbtn.o | 126 | obj-$(CONFIG_INTEL_MRFLD_PWRBTN) += intel_mrfld_pwrbtn.o |
| 143 | obj-$(CONFIG_INTEL_PMC_CORE) += intel_pmc_core.o intel_pmc_core_pltdrv.o | 127 | obj-$(CONFIG_INTEL_PMC_CORE) += intel_pmc_core.o intel_pmc_core_pltdrv.o |
| 144 | obj-$(CONFIG_INTEL_PMT_CLASS) += intel_pmt_class.o | 128 | obj-$(CONFIG_INTEL_PMT_CLASS) += intel_pmt_class.o |
| @@ -148,6 +132,7 @@ obj-$(CONFIG_INTEL_PUNIT_IPC) += intel_punit_ipc.o · 3 unmodified lines | |||
| 148 | obj-$(CONFIG_INTEL_SCU_IPC) += intel_scu_ipc.o | 132 | obj-$(CONFIG_INTEL_SCU_IPC) += intel_scu_ipc.o |
| 149 | obj-$(CONFIG_INTEL_SCU_PCI) += intel_scu_pcidrv.o | 133 | obj-$(CONFIG_INTEL_SCU_PCI) += intel_scu_pcidrv.o |
| 150 | obj-$(CONFIG_INTEL_SCU_PLATFORM) += intel_scu_pltdrv.o | 134 | obj-$(CONFIG_INTEL_SCU_PLATFORM) += intel_scu_pltdrv.o |
| 135 | obj-$(CONFIG_INTEL_SCU_WDT) += intel_scu_wdt.o | ||
| 151 | obj-$(CONFIG_INTEL_SCU_IPC_UTIL) += intel_scu_ipcutil.o | 136 | obj-$(CONFIG_INTEL_SCU_IPC_UTIL) += intel_scu_ipcutil.o |
| 152 | obj-$(CONFIG_INTEL_TELEMETRY) += intel_telemetry_core.o \ | 137 | obj-$(CONFIG_INTEL_TELEMETRY) += intel_telemetry_core.o \ |
| 153 | intel_telemetry_pltdrv.o \ | 138 | intel_telemetry_pltdrv.o \ |
| @@ -30,7 +30,6 @@ · 29 unmodified lines | |||
| 30 | #include <linux/input/sparse-keymap.h> | 30 | #include <linux/input/sparse-keymap.h> |
| 31 | #include <acpi/video.h> | 31 | #include <acpi/video.h> |
| 32 | 32 | ||
| 33 | ACPI_MODULE_NAME(KBUILD_MODNAME); | ||
| 34 | MODULE_AUTHOR("Carlos Corbacho"); | 33 | MODULE_AUTHOR("Carlos Corbacho"); |
| 35 | MODULE_DESCRIPTION("Acer Laptop WMI Extras Driver"); | 34 | MODULE_DESCRIPTION("Acer Laptop WMI Extras Driver"); |
| 36 | MODULE_LICENSE("GPL"); | 35 | MODULE_LICENSE("GPL"); |
| @@ -1605,7 +1604,8 @@ static void acer_kbd_dock_get_initial_state(void) · 1568 unmodified lines | |||
| 1605 | 1604 | ||
| 1606 | status = wmi_evaluate_method(WMID_GUID3, 0, 0x2, &input_buf, &output_buf); | 1605 | status = wmi_evaluate_method(WMID_GUID3, 0, 0x2, &input_buf, &output_buf); |
| 1607 | if (ACPI_FAILURE(status)) { | 1606 | if (ACPI_FAILURE(status)) { |
| 1608 | ACPI_EXCEPTION((AE_INFO, status, "Error getting keyboard-dock initial status")); | 1607 | pr_err("Error getting keyboard-dock initial status: %s\n", |
| 1608 | acpi_format_exception(status)); | ||
| 1609 | return; | 1609 | return; |
| 1610 | } | 1610 | } |
| 1611 | 1611 | ||
| @@ -210,31 +210,39 @@ static int amd_pmc_probe(struct platform_device *pdev) · 209 unmodified lines | |||
| 210 | dev->dev = &pdev->dev; | 210 | dev->dev = &pdev->dev; |
| 211 | 211 | ||
| 212 | rdev = pci_get_domain_bus_and_slot(0, 0, PCI_DEVFN(0, 0)); | 212 | rdev = pci_get_domain_bus_and_slot(0, 0, PCI_DEVFN(0, 0)); |
| 213 | if (!rdev || !pci_match_id(pmc_pci_ids, rdev)) | 213 | if (!rdev || !pci_match_id(pmc_pci_ids, rdev)) { |
| 214 | pci_dev_put(rdev); | ||
| 214 | return -ENODEV; | 215 | return -ENODEV; |
| 216 | } | ||
| 215 | 217 | ||
| 216 | dev->cpu_id = rdev->device; | 218 | dev->cpu_id = rdev->device; |
| 217 | err = pci_write_config_dword(rdev, AMD_PMC_SMU_INDEX_ADDRESS, AMD_PMC_BASE_ADDR_LO); | 219 | err = pci_write_config_dword(rdev, AMD_PMC_SMU_INDEX_ADDRESS, AMD_PMC_BASE_ADDR_LO); |
| 218 | if (err) { | 220 | if (err) { |
| 219 | dev_err(dev->dev, "error writing to 0x%x\n", AMD_PMC_SMU_INDEX_ADDRESS); | 221 | dev_err(dev->dev, "error writing to 0x%x\n", AMD_PMC_SMU_INDEX_ADDRESS); |
| 222 | pci_dev_put(rdev); | ||
| 220 | return pcibios_err_to_errno(err); | 223 | return pcibios_err_to_errno(err); |
| 221 | } | 224 | } |
| 222 | 225 | ||
| 223 | err = pci_read_config_dword(rdev, AMD_PMC_SMU_INDEX_DATA, &val); | 226 | err = pci_read_config_dword(rdev, AMD_PMC_SMU_INDEX_DATA, &val); |
| 224 | if (err) | 227 | if (err) { |
| 228 | pci_dev_put(rdev); | ||
| 225 | return pcibios_err_to_errno(err); | 229 | return pcibios_err_to_errno(err); |
| 230 | } | ||
| 226 | 231 | ||
| 227 | base_addr_lo = val & AMD_PMC_BASE_ADDR_HI_MASK; | 232 | base_addr_lo = val & AMD_PMC_BASE_ADDR_HI_MASK; |
| 228 | 233 | ||
| 229 | err = pci_write_config_dword(rdev, AMD_PMC_SMU_INDEX_ADDRESS, AMD_PMC_BASE_ADDR_HI); | 234 | err = pci_write_config_dword(rdev, AMD_PMC_SMU_INDEX_ADDRESS, AMD_PMC_BASE_ADDR_HI); |
| 230 | if (err) { | 235 | if (err) { |
| 231 | dev_err(dev->dev, "error writing to 0x%x\n", AMD_PMC_SMU_INDEX_ADDRESS); | 236 | dev_err(dev->dev, "error writing to 0x%x\n", AMD_PMC_SMU_INDEX_ADDRESS); |
| 237 | pci_dev_put(rdev); | ||
| 232 | return pcibios_err_to_errno(err); | 238 | return pcibios_err_to_errno(err); |
| 233 | } | 239 | } |
| 234 | 240 | ||
| 235 | err = pci_read_config_dword(rdev, AMD_PMC_SMU_INDEX_DATA, &val); | 241 | err = pci_read_config_dword(rdev, AMD_PMC_SMU_INDEX_DATA, &val); |
| 236 | if (err) | 242 | if (err) { |
| 243 | pci_dev_put(rdev); | ||
| 237 | return pcibios_err_to_errno(err); | 244 | return pcibios_err_to_errno(err); |
| 245 | } | ||
| 238 | 246 | ||
| 239 | base_addr_hi = val & AMD_PMC_BASE_ADDR_LO_MASK; | 247 | base_addr_hi = val & AMD_PMC_BASE_ADDR_LO_MASK; |
| 240 | pci_dev_put(rdev); | 248 | pci_dev_put(rdev); |
| @@ -0,0 +1,207 @@ | |||
| 1 | # SPDX-License-Identifier: GPL-2.0-only | ||
| 2 | # | ||
| 3 | # Dell X86 Platform Specific Drivers | ||
| 4 | # | ||
| 5 | |||
| 6 | menuconfig X86_PLATFORM_DRIVERS_DELL | ||
| 7 | bool "Dell X86 Platform Specific Device Drivers" | ||
| 8 | default n | ||
| 9 | depends on X86_PLATFORM_DEVICES | ||
| 10 | help | ||
| 11 | Say Y here to get to see options for device drivers for various | ||
| 12 | Dell x86 platforms, including vendor-specific laptop extension drivers. | ||
| 13 | This option alone does not add any kernel code. | ||
| 14 | |||
| 15 | If you say N, all options in this submenu will be skipped and disabled. | ||
| 16 | |||
| 17 | if X86_PLATFORM_DRIVERS_DELL | ||
| 18 | |||
| 19 | config ALIENWARE_WMI | ||
| 20 | tristate "Alienware Special feature control" | ||
| 21 | default m | ||
| 22 | depends on ACPI | ||
| 23 | depends on LEDS_CLASS | ||
| 24 | depends on NEW_LEDS | ||
| 25 | depends on ACPI_WMI | ||
| 26 | help | ||
| 27 | This is a driver for controlling Alienware BIOS driven | ||
| 28 | features. It exposes an interface for controlling the AlienFX | ||
| 29 | zones on Alienware machines that don't contain a dedicated AlienFX | ||
| 30 | USB MCU such as the X51 and X51-R2. | ||
| 31 | |||
| 32 | config DCDBAS | ||
| 33 | tristate "Dell Systems Management Base Driver" | ||
| 34 | default m | ||
| 35 | depends on X86 | ||
| 36 | help | ||
| 37 | The Dell Systems Management Base Driver provides a sysfs interface | ||
| 38 | for systems management software to perform System Management | ||
| 39 | Interrupts (SMIs) and Host Control Actions (system power cycle or | ||
| 40 | power off after OS shutdown) on certain Dell systems. | ||
| 41 | |||
| 42 | See <file:Documentation/driver-api/dcdbas.rst> for more details on the driver | ||
| 43 | and the Dell systems on which Dell systems management software makes | ||
| 44 | use of this driver. | ||
| 45 | |||
| 46 | Say Y or M here to enable the driver for use by Dell systems | ||
| 47 | management software such as Dell OpenManage. | ||
| 48 | |||
| 49 | config DELL_LAPTOP | ||
| 50 | tristate "Dell Laptop Extras" | ||
| 51 | default m | ||
| 52 | depends on DMI | ||
| 53 | depends on BACKLIGHT_CLASS_DEVICE | ||
| 54 | depends on ACPI_VIDEO || ACPI_VIDEO = n | ||
| 55 | depends on RFKILL || RFKILL = n | ||
| 56 | depends on SERIO_I8042 | ||
| 57 | depends on DELL_SMBIOS | ||
| 58 | select POWER_SUPPLY | ||
| 59 | select LEDS_CLASS | ||
| 60 | select NEW_LEDS | ||
| 61 | select LEDS_TRIGGERS | ||
| 62 | select LEDS_TRIGGER_AUDIO | ||
| 63 | help | ||
| 64 | This driver adds support for rfkill and backlight control to Dell | ||
| 65 | laptops (except for some models covered by the Compal driver). | ||
| 66 | |||
| 67 | config DELL_RBU | ||
| 68 | tristate "BIOS update support for DELL systems via sysfs" | ||
| 69 | default m | ||
| 70 | depends on X86 | ||
| 71 | select FW_LOADER | ||
| 72 | select FW_LOADER_USER_HELPER | ||
| 73 | help | ||
| 74 | Say m if you want to have the option of updating the BIOS for your | ||
| 75 | DELL system. Note you need a Dell OpenManage or Dell Update package (DUP) | ||
| 76 | supporting application to communicate with the BIOS regarding the new | ||
| 77 | image for the image update to take effect. | ||
| 78 | See <file:Documentation/admin-guide/dell_rbu.rst> for more details on the driver. | ||
| 79 | |||
| 80 | config DELL_RBTN | ||
| 81 | tristate "Dell Airplane Mode Switch driver" | ||
| 82 | default m | ||
| 83 | depends on ACPI | ||
| 84 | depends on INPUT | ||
| 85 | depends on RFKILL | ||
| 86 | help | ||
| 87 | Say Y here if you want to support Dell Airplane Mode Switch ACPI | ||
| 88 | device on Dell laptops. Sometimes it has names: DELLABCE or DELRBTN. | ||
| 89 | This driver register rfkill device or input hotkey device depending | ||
| 90 | on hardware type (hw switch slider or keyboard toggle button). For | ||
| 91 | rfkill devices it receive HW switch events and set correct hard | ||
| 92 | rfkill state. | ||
| 93 | |||
| 94 | To compile this driver as a module, choose M here: the module will | ||
| 95 | be called dell-rbtn. | ||
| 96 | |||
| 97 | # | ||
| 98 | # The DELL_SMBIOS driver depends on ACPI_WMI and/or DCDBAS if those | ||
| 99 | # backends are selected. The "depends" line prevents a configuration | ||
| 100 | # where DELL_SMBIOS=y while either of those dependencies =m. | ||
| 101 | # | ||
| 102 | config DELL_SMBIOS | ||
| 103 | tristate "Dell SMBIOS driver" | ||
| 104 | default m | ||
| 105 | depends on DCDBAS || DCDBAS=n | ||
| 106 | depends on ACPI_WMI || ACPI_WMI=n | ||
| 107 | help | ||
| 108 | This provides support for the Dell SMBIOS calling interface. | ||
| 109 | If you have a Dell computer you should enable this option. | ||
| 110 | |||
| 111 | Be sure to select at least one backend for it to work properly. | ||
| 112 | |||
| 113 | config DELL_SMBIOS_WMI | ||
| 114 | bool "Dell SMBIOS driver WMI backend" | ||
| 115 | default y | ||
| 116 | depends on ACPI_WMI | ||
| 117 | select DELL_WMI_DESCRIPTOR | ||
| 118 | depends on DELL_SMBIOS | ||
| 119 | help | ||
| 120 | This provides an implementation for the Dell SMBIOS calling interface | ||
| 121 | communicated over ACPI-WMI. | ||
| 122 | |||
| 123 | If you have a Dell computer from >2007 you should say Y here. | ||
| 124 | If you aren't sure and this module doesn't work for your computer | ||
| 125 | it just won't load. | ||
| 126 | |||
| 127 | config DELL_SMBIOS_SMM | ||
| 128 | bool "Dell SMBIOS driver SMM backend" | ||
| 129 | default y | ||
| 130 | depends on DCDBAS | ||
| 131 | depends on DELL_SMBIOS | ||
| 132 | help | ||
| 133 | This provides an implementation for the Dell SMBIOS calling interface | ||
| 134 | communicated over SMI/SMM. | ||
| 135 | |||
| 136 | If you have a Dell computer from <=2017 you should say Y here. | ||
| 137 | If you aren't sure and this module doesn't work for your computer | ||
| 138 | it just won't load. | ||
| 139 | |||
| 140 | config DELL_SMO8800 | ||
| 141 | tristate "Dell Latitude freefall driver (ACPI SMO88XX)" | ||
| 142 | default m | ||
| 143 | depends on ACPI | ||
| 144 | help | ||
| 145 | Say Y here if you want to support SMO88XX freefall devices | ||
| 146 | on Dell Latitude laptops. | ||
| 147 | |||
| 148 | To compile this driver as a module, choose M here: the module will | ||
| 149 | be called dell-smo8800. | ||
| 150 | |||
| 151 | config DELL_WMI | ||
| 152 | tristate "Dell WMI notifications" | ||
| 153 | default m | ||
| 154 | depends on ACPI_WMI | ||
| 155 | depends on DMI | ||
| 156 | depends on INPUT | ||
| 157 | depends on ACPI_VIDEO || ACPI_VIDEO = n | ||
| 158 | depends on DELL_SMBIOS | ||
| 159 | select DELL_WMI_DESCRIPTOR | ||
| 160 | select INPUT_SPARSEKMAP | ||
| 161 | help | ||
| 162 | Say Y here if you want to support WMI-based hotkeys on Dell laptops. | ||
| 163 | |||
| 164 | To compile this driver as a module, choose M here: the module will | ||
| 165 | be called dell-wmi. | ||
| 166 | |||
| 167 | config DELL_WMI_AIO | ||
| 168 | tristate "WMI Hotkeys for Dell All-In-One series" | ||
| 169 | default m | ||
| 170 | depends on ACPI_WMI | ||
| 171 | depends on INPUT | ||
| 172 | select INPUT_SPARSEKMAP | ||
| 173 | help | ||
| 174 | Say Y here if you want to support WMI-based hotkeys on Dell | ||
| 175 | All-In-One machines. | ||
| 176 | |||
| 177 | To compile this driver as a module, choose M here: the module will | ||
| 178 | be called dell-wmi-aio. | ||
| 179 | |||
| 180 | config DELL_WMI_DESCRIPTOR | ||
| 181 | tristate | ||
| 182 | default m | ||
| 183 | depends on ACPI_WMI | ||
| 184 | |||
| 185 | config DELL_WMI_LED | ||
| 186 | tristate "External LED on Dell Business Netbooks" | ||
| 187 | default m | ||
| 188 | depends on LEDS_CLASS | ||
| 189 | depends on ACPI_WMI | ||
| 190 | help | ||
| 191 | This adds support for the Latitude 2100 and similar | ||
| 192 | notebooks that have an external LED. | ||
| 193 | |||
| 194 | config DELL_WMI_SYSMAN | ||
| 195 | tristate "Dell WMI-based Systems management driver" | ||
| 196 | default m | ||
| 197 | depends on ACPI_WMI | ||
| 198 | depends on DMI | ||
| 199 | select NLS | ||
| 200 | help | ||
| 201 | This driver allows changing BIOS settings on many Dell machines from | ||
| 202 | 2018 and newer without the use of any additional software. | ||
| 203 | |||
| 204 | To compile this driver as a module, choose M here: the module will | ||
| 205 | be called dell-wmi-sysman. | ||
| 206 | |||
| 207 | endif # X86_PLATFORM_DRIVERS_DELL | ||
| @@ -0,0 +1,21 @@ | |||
| 1 | # SPDX-License-Identifier: GPL-2.0 | ||
| 2 | # | ||
| 3 | # Makefile for linux/drivers/platform/x86/dell | ||
| 4 | # Dell x86 Platform-Specific Drivers | ||
| 5 | # | ||
| 6 | |||
| 7 | obj-$(CONFIG_ALIENWARE_WMI) += alienware-wmi.o | ||
| 8 | obj-$(CONFIG_DCDBAS) += dcdbas.o | ||
| 9 | obj-$(CONFIG_DELL_LAPTOP) += dell-laptop.o | ||
| 10 | obj-$(CONFIG_DELL_RBTN) += dell-rbtn.o | ||
| 11 | obj-$(CONFIG_DELL_RBU) += dell_rbu.o | ||
| 12 | obj-$(CONFIG_DELL_SMBIOS) += dell-smbios.o | ||
| 13 | dell-smbios-objs := dell-smbios-base.o | ||
| 14 | dell-smbios-$(CONFIG_DELL_SMBIOS_WMI) += dell-smbios-wmi.o | ||
| 15 | dell-smbios-$(CONFIG_DELL_SMBIOS_SMM) += dell-smbios-smm.o | ||
| 16 | obj-$(CONFIG_DELL_SMO8800) += dell-smo8800.o | ||
| 17 | obj-$(CONFIG_DELL_WMI) += dell-wmi.o | ||
| 18 | obj-$(CONFIG_DELL_WMI_AIO) += dell-wmi-aio.o | ||
| 19 | obj-$(CONFIG_DELL_WMI_DESCRIPTOR) += dell-wmi-descriptor.o | ||
| 20 | obj-$(CONFIG_DELL_WMI_LED) += dell-wmi-led.o | ||
| 21 | obj-$(CONFIG_DELL_WMI_SYSMAN) += dell-wmi-sysman/ | ||
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| @@ -8,33 +8,34 @@ · 7 unmodified lines | |||
| 8 | 8 | ||
| 9 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt | 9 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
| 10 | 10 | ||
| 11 | #include <linux/kernel.h> | ||
| 12 | #include <linux/module.h> | ||
| 13 | #include <linux/init.h> | ||
| 14 | #include <linux/types.h> | ||
| 15 | #include <linux/acpi.h> | 11 | #include <linux/acpi.h> |
| 16 | #include <linux/rfkill.h> | ||
| 17 | #include <linux/platform_device.h> | ||
| 18 | #include <linux/input.h> | ||
| 19 | #include <linux/input/sparse-keymap.h> | ||
| 20 | #include <linux/backlight.h> | 12 | #include <linux/backlight.h> |
| 21 | #include <linux/fb.h> | 13 | #include <linux/bitops.h> |
| 14 | #include <linux/bug.h> | ||
| 22 | #include <linux/debugfs.h> | 15 | #include <linux/debugfs.h> |
| 23 | #include <linux/seq_file.h> | ||
| 24 | #include <linux/i8042.h> | ||
| 25 | #include <linux/dmi.h> | ||
| 26 | #include <linux/device.h> | 16 | #include <linux/device.h> |
| 27 | #include <acpi/video.h> | 17 | #include <linux/dmi.h> |
| 18 | #include <linux/fb.h> | ||
| 19 | #include <linux/i8042.h> | ||
| 20 | #include <linux/init.h> | ||
| 21 | #include <linux/input.h> | ||
| 22 | #include <linux/input/sparse-keymap.h> | ||
| 23 | #include <linux/jiffies.h> | ||
| 24 | #include <linux/kernel.h> | ||
| 25 | #include <linux/leds.h> | ||
| 26 | #include <linux/module.h> | ||
| 27 | #include <linux/platform_device.h> | ||
| 28 | #include <linux/platform_profile.h> | ||
| 29 | #include <linux/rfkill.h> | ||
| 30 | #include <linux/seq_file.h> | ||
| 31 | #include <linux/sysfs.h> | ||
| 32 | #include <linux/types.h> | ||
| 28 | 33 | ||
| 29 | #define IDEAPAD_RFKILL_DEV_NUM (3) | 34 | #include <acpi/video.h> |
| 30 | 35 | ||
| 31 | #define BM_CONSERVATION_BIT (5) | 36 | #include <dt-bindings/leds/common.h> |
| 32 | #define HA_FNLOCK_BIT (10) | ||
| 33 | 37 | ||
| 34 | #define CFG_BT_BIT (16) | 38 | #define IDEAPAD_RFKILL_DEV_NUM 3 |
| 35 | #define CFG_3G_BIT (17) | ||
| 36 | #define CFG_WIFI_BIT (18) | ||
| 37 | #define CFG_CAMERA_BIT (19) | ||
| 38 | 39 | ||
| 39 | #if IS_ENABLED(CONFIG_ACPI_WMI) | 40 | #if IS_ENABLED(CONFIG_ACPI_WMI) |
| 40 | static const char *const ideapad_wmi_fnesc_events[] = { | 41 | static const char *const ideapad_wmi_fnesc_events[] = { |
| @@ -44,10 +45,39 @@ static const char *const ideapad_wmi_fnesc_events[] = { · 3 unmodified lines | |||
| 44 | #endif | 45 | #endif |
| 45 | 46 | ||
| 46 | enum { | 47 | enum { |
| 47 | BMCMD_CONSERVATION_ON = 3, | 48 | CFG_CAP_BT_BIT = 16, |
| 48 | BMCMD_CONSERVATION_OFF = 5, | 49 | CFG_CAP_3G_BIT = 17, |
| 49 | HACMD_FNLOCK_ON = 0xe, | 50 | CFG_CAP_WIFI_BIT = 18, |
| 50 | HACMD_FNLOCK_OFF = 0xf, | 51 | CFG_CAP_CAM_BIT = 19, |
| 52 | CFG_CAP_TOUCHPAD_BIT = 30, | ||
| 53 | }; | ||
| 54 | |||
| 55 | enum { | ||
| 56 | GBMD_CONSERVATION_STATE_BIT = 5, | ||
| 57 | }; | ||
| 58 | |||
| 59 | enum { | ||
| 60 | SMBC_CONSERVATION_ON = 3, | ||
| 61 | SMBC_CONSERVATION_OFF = 5, | ||
| 62 | }; | ||
| 63 | |||
| 64 | enum { | ||
| 65 | HALS_KBD_BL_SUPPORT_BIT = 4, | ||
| 66 | HALS_KBD_BL_STATE_BIT = 5, | ||
| 67 | HALS_USB_CHARGING_SUPPORT_BIT = 6, | ||
| 68 | HALS_USB_CHARGING_STATE_BIT = 7, | ||
| 69 | HALS_FNLOCK_SUPPORT_BIT = 9, | ||
| 70 | HALS_FNLOCK_STATE_BIT = 10, | ||
| 71 | HALS_HOTKEYS_PRIMARY_BIT = 11, | ||
| 72 | }; | ||
| 73 | |||
| 74 | enum { | ||
| 75 | SALS_KBD_BL_ON = 0x8, | ||
| 76 | SALS_KBD_BL_OFF = 0x9, | ||
| 77 | SALS_USB_CHARGING_ON = 0xa, | ||
| 78 | SALS_USB_CHARGING_OFF = 0xb, | ||
| 79 | SALS_FNLOCK_ON = 0xe, | ||
| 80 | SALS_FNLOCK_OFF = 0xf, | ||
| 51 | }; | 81 | }; |
| 52 | 82 | ||
| 53 | enum { | 83 | enum { |
| @@ -77,6 +107,13 @@ enum { · 23 unmodified lines | |||
| 77 | VPCCMD_W_BL_POWER = 0x33, | 107 | VPCCMD_W_BL_POWER = 0x33, |
| 78 | }; | 108 | }; |
| 79 | 109 | ||
| 110 | struct ideapad_dytc_priv { | ||
| 111 | enum platform_profile_option current_profile; | ||
| 112 | struct platform_profile_handler pprof; | ||
| 113 | struct mutex mutex; /* protects the DYTC interface */ | ||
| 114 | struct ideapad_private *priv; | ||
| 115 | }; | ||
| 116 | |||
| 80 | struct ideapad_rfk_priv { | 117 | struct ideapad_rfk_priv { |
| 81 | int dev; | 118 | int dev; |
| 82 | struct ideapad_private *priv; | 119 | struct ideapad_private *priv; |
| @@ -89,11 +126,25 @@ struct ideapad_private { · 6 unmodified lines | |||
| 89 | struct platform_device *platform_device; | 126 | struct platform_device *platform_device; |
| 90 | struct input_dev *inputdev; | 127 | struct input_dev *inputdev; |
| 91 | struct backlight_device *blightdev; | 128 | struct backlight_device *blightdev; |
| 129 | struct ideapad_dytc_priv *dytc; | ||
| 92 | struct dentry *debug; | 130 | struct dentry *debug; |
| 93 | unsigned long cfg; | 131 | unsigned long cfg; |
| 94 | bool has_hw_rfkill_switch; | ||
| 95 | bool has_touchpad_switch; | ||
| 96 | const char *fnesc_guid; | 132 | const char *fnesc_guid; |
| 133 | struct { | ||
| 134 | bool conservation_mode : 1; | ||
| 135 | bool dytc : 1; | ||
| 136 | bool fan_mode : 1; | ||
| 137 | bool fn_lock : 1; | ||
| 138 | bool hw_rfkill_switch : 1; | ||
| 139 | bool kbd_bl : 1; | ||
| 140 | bool touchpad_ctrl_via_ec : 1; | ||
| 141 | bool usb_charging : 1; | ||
| 142 | } features; | ||
| 143 | struct { | ||
| 144 | bool initialized; | ||
| 145 | struct led_classdev led; | ||
| 146 | unsigned int last_brightness; | ||
| 147 | } kbd_bl; | ||
| 97 | }; | 148 | }; |
| 98 | 149 | ||
| 99 | static bool no_bt_rfkill; | 150 | static bool no_bt_rfkill; |
| @@ -103,64 +154,82 @@ MODULE_PARM_DESC(no_bt_rfkill, "No rfkill for bluetooth."); · 3 unmodified lines | |||
| 103 | /* | 154 | /* |
| 104 | * ACPI Helpers | 155 | * ACPI Helpers |
| 105 | */ | 156 | */ |
| 106 | #define IDEAPAD_EC_TIMEOUT (200) /* in ms */ | 157 | #define IDEAPAD_EC_TIMEOUT 200 /* in ms */ |
| 107 | 158 | ||
| 108 | static int read_method_int(acpi_handle handle, const char *method, int *val) | 159 | static int eval_int(acpi_handle handle, const char *name, unsigned long *res) |
| 109 | { | 160 | { |
| 110 | acpi_status status; | ||
| 111 | unsigned long long result; | 161 | unsigned long long result; |
| 162 | acpi_status status; | ||
| 163 | |||
| 164 | status = acpi_evaluate_integer(handle, (char *)name, NULL, &result); | ||
| 165 | if (ACPI_FAILURE(status)) | ||
| 166 | return -EIO; | ||
| 167 | |||
| 168 | *res = result; | ||
| 112 | 169 | ||
| 113 | status = acpi_evaluate_integer(handle, (char *)method, NULL, &result); | ||
| 114 | if (ACPI_FAILURE(status)) { | ||
| 115 | *val = -1; | ||
| 116 | return -1; | ||
| 117 | } | ||
| 118 | *val = result; | ||
| 119 | return 0; | 170 | return 0; |
| 171 | } | ||
| 172 | |||
| 173 | static int exec_simple_method(acpi_handle handle, const char *name, unsigned long arg) | ||
| 174 | { | ||
| 175 | acpi_status status = acpi_execute_simple_method(handle, (char *)name, arg); | ||
| 120 | 176 | ||
| 177 | return ACPI_FAILURE(status) ? -EIO : 0; | ||
| 121 | } | 178 | } |
| 122 | 179 | ||
| 123 | static int method_gbmd(acpi_handle handle, unsigned long *ret) | 180 | static int eval_gbmd(acpi_handle handle, unsigned long *res) |
| 124 | { | 181 | { |
| 125 | int result, val; | 182 | return eval_int(handle, "GBMD", res); |
| 183 | } | ||
| 126 | 184 | ||
| 127 | result = read_method_int(handle, "GBMD", &val); | 185 | static int exec_smbc(acpi_handle handle, unsigned long arg) |
| 128 | *ret = val; | 186 | { |
| 129 | return result; | 187 | return exec_simple_method(handle, "SMBC", arg); |
| 130 | } | 188 | } |
| 131 | 189 | ||
| 132 | static int method_int1(acpi_handle handle, char *method, int cmd) | 190 | static int eval_hals(acpi_handle handle, unsigned long *res) |
| 133 | { | 191 | { |
| 134 | acpi_status status; | 192 | return eval_int(handle, "HALS", res); |
| 193 | } | ||
| 135 | 194 | ||
| 136 | status = acpi_execute_simple_method(handle, method, cmd); | 195 | static int exec_sals(acpi_handle handle, unsigned long arg) |
| 137 | return ACPI_FAILURE(status) ? -1 : 0; | 196 | { |
| 197 | return exec_simple_method(handle, "SALS", arg); | ||
| 138 | } | 198 | } |
| 139 | 199 | ||
| 140 | static int method_vpcr(acpi_handle handle, int cmd, int *ret) | 200 | static int eval_int_with_arg(acpi_handle handle, const char *name, unsigned long arg, unsigned long *res) |
| 141 | { | 201 | { |
| 142 | acpi_status status; | ||
| 143 | unsigned long long result; | ||
| 144 | struct acpi_object_list params; | 202 | struct acpi_object_list params; |
| 203 | unsigned long long result; | ||
| 145 | union acpi_object in_obj; | 204 | union acpi_object in_obj; |
| 205 | acpi_status status; | ||
| 146 | 206 | ||
| 147 | params.count = 1; | 207 | params.count = 1; |
| 148 | params.pointer = &in_obj; | 208 | params.pointer = &in_obj; |
| 149 | in_obj.type = ACPI_TYPE_INTEGER; | 209 | in_obj.type = ACPI_TYPE_INTEGER; |
| 150 | in_obj.integer.value = cmd; | 210 | in_obj.integer.value = arg; |
| 211 | |||
| 212 | status = acpi_evaluate_integer(handle, (char *)name, ¶ms, &result); | ||
| 213 | if (ACPI_FAILURE(status)) | ||
| 214 | return -EIO; | ||
| 151 | 215 | ||
| 152 | status = acpi_evaluate_integer(handle, "VPCR", ¶ms, &result); | 216 | if (res) |
| 217 | *res = result; | ||
| 153 | 218 | ||
| 154 | if (ACPI_FAILURE(status)) { | ||
| 155 | *ret = -1; | ||
| 156 | return -1; | ||
| 157 | } | ||
| 158 | *ret = result; | ||
| 159 | return 0; | 219 | return 0; |
| 220 | } | ||
| 160 | 221 | ||
| 222 | static int eval_dytc(acpi_handle handle, unsigned long cmd, unsigned long *res) | ||
| 223 | { | ||
| 224 | return eval_int_with_arg(handle, "DYTC", cmd, res); | ||
| 161 | } | 225 | } |
| 162 | 226 | ||
| 163 | static int method_vpcw(acpi_handle handle, int cmd, int data) | 227 | static int eval_vpcr(acpi_handle handle, unsigned long cmd, unsigned long *res) |
| 228 | { | ||
| 229 | return eval_int_with_arg(handle, "VPCR", cmd, res); | ||
| 230 | } | ||
| 231 | |||
| 232 | static int eval_vpcw(acpi_handle handle, unsigned long cmd, unsigned long data) | ||
| 164 | { | 233 | { |
| 165 | struct acpi_object_list params; | 234 | struct acpi_object_list params; |
| 166 | union acpi_object in_obj[2]; | 235 | union acpi_object in_obj[2]; |
| @@ -174,55 +243,68 @@ static int method_vpcw(acpi_handle handle, int cmd, int data) · 7 unmodified lines | |||
| 174 | in_obj[1].integer.value = data; | 243 | in_obj[1].integer.value = data; |
| 175 | 244 | ||
| 176 | status = acpi_evaluate_object(handle, "VPCW", ¶ms, NULL); | 245 | status = acpi_evaluate_object(handle, "VPCW", ¶ms, NULL); |
| 177 | if (status != AE_OK) | 246 | if (ACPI_FAILURE(status)) |
| 178 | return -1; | 247 | return -EIO; |
| 248 | |||
| 179 | return 0; | 249 | return 0; |
| 180 | } | 250 | } |
| 181 | 251 | ||
| 182 | static int read_ec_data(acpi_handle handle, int cmd, unsigned long *data) | 252 | static int read_ec_data(acpi_handle handle, unsigned long cmd, unsigned long *data) |
| 183 | { | 253 | { |
| 184 | int val; | 254 | unsigned long end_jiffies, val; |
| 185 | unsigned long int end_jiffies; | 255 | int err; |
| 256 | |||
| 257 | err = eval_vpcw(handle, 1, cmd); | ||
| 258 | if (err) | ||
| 259 | return err; | ||
| 186 | 260 | ||
| 187 | if (method_vpcw(handle, 1, cmd)) | 261 | end_jiffies = jiffies + msecs_to_jiffies(IDEAPAD_EC_TIMEOUT) + 1; |
| 188 | return -1; | ||
| 189 | 262 | ||
| 190 | for (end_jiffies = jiffies+(HZ)*IDEAPAD_EC_TIMEOUT/1000+1; | 263 | while (time_before(jiffies, end_jiffies)) { |
| 191 | time_before(jiffies, end_jiffies);) { | ||
| 192 | schedule(); | 264 | schedule(); |
| 193 | if (method_vpcr(handle, 1, &val)) | 265 | |
| 194 | return -1; | 266 | err = eval_vpcr(handle, 1, &val); |
| 195 | if (val == 0) { | 267 | if (err) |
| 196 | if (method_vpcr(handle, 0, &val)) | 268 | return err; |
| 197 | return -1; | 269 | |
| 198 | *data = val; | 270 | if (val == 0) |
| 199 | return 0; | 271 | return eval_vpcr(handle, 0, data); |
| 200 | } | ||
| 201 | } | 272 | } |
| 202 | pr_err("timeout in %s\n", __func__); | 273 | |
| 203 | return -1; | 274 | acpi_handle_err(handle, "timeout in %s\n", __func__); |
| 275 | |||
| 276 | return -ETIMEDOUT; | ||
| 204 | } | 277 | } |
| 205 | 278 | ||
| 206 | static int write_ec_cmd(acpi_handle handle, int cmd, unsigned long data) | 279 | static int write_ec_cmd(acpi_handle handle, unsigned long cmd, unsigned long data) |
| 207 | { | 280 | { |
| 208 | int val; | 281 | unsigned long end_jiffies, val; |
| 209 | unsigned long int end_jiffies; | 282 | int err; |
| 283 | |||
| 284 | err = eval_vpcw(handle, 0, data); | ||
| 285 | if (err) | ||
| 286 | return err; | ||
| 287 | |||
| 288 | err = eval_vpcw(handle, 1, cmd); | ||
| 289 | if (err) | ||
| 290 | return err; | ||
| 210 | 291 | ||
| 211 | if (method_vpcw(handle, 0, data)) | 292 | end_jiffies = jiffies + msecs_to_jiffies(IDEAPAD_EC_TIMEOUT) + 1; |
| 212 | return -1; | ||
| 213 | if (method_vpcw(handle, 1, cmd)) | ||
| 214 | return -1; | ||
| 215 | 293 | ||
| 216 | for (end_jiffies = jiffies+(HZ)*IDEAPAD_EC_TIMEOUT/1000+1; | 294 | while (time_before(jiffies, end_jiffies)) { |
| 217 | time_before(jiffies, end_jiffies);) { | ||
| 218 | schedule(); | 295 | schedule(); |
| 219 | if (method_vpcr(handle, 1, &val)) | 296 | |
| 220 | return -1; | 297 | err = eval_vpcr(handle, 1, &val); |
| 298 | if (err) | ||
| 299 | return err; | ||
| 300 | |||
| 221 | if (val == 0) | 301 | if (val == 0) |
| 222 | return 0; | 302 | return 0; |
| 223 | } | 303 | } |
| 224 | pr_err("timeout in %s\n", __func__); | 304 | |
| 225 | return -1; | 305 | acpi_handle_err(handle, "timeout in %s\n", __func__); |
| 306 | |||
| 307 | return -ETIMEDOUT; | ||
| 226 | } | 308 | } |
| 227 | 309 | ||
| 228 | /* | 310 | /* |
| @@ -233,44 +315,37 @@ static int debugfs_status_show(struct seq_file *s, void *data) · 4 unmodified lines | |||
| 233 | struct ideapad_private *priv = s->private; | 315 | struct ideapad_private *priv = s->private; |
| 234 | unsigned long value; | 316 | unsigned long value; |
| 235 | 317 | ||
| 236 | if (!priv) | ||
| 237 | return -EINVAL; | ||
| 238 | |||
| 239 | if (!read_ec_data(priv->adev->handle, VPCCMD_R_BL_MAX, &value)) | 318 | if (!read_ec_data(priv->adev->handle, VPCCMD_R_BL_MAX, &value)) |
| 240 | seq_printf(s, "Backlight max:\t%lu\n", value); | 319 | seq_printf(s, "Backlight max: %lu\n", value); |
| 241 | if (!read_ec_data(priv->adev->handle, VPCCMD_R_BL, &value)) | 320 | if (!read_ec_data(priv->adev->handle, VPCCMD_R_BL, &value)) |
| 242 | seq_printf(s, "Backlight now:\t%lu\n", value); | 321 | seq_printf(s, "Backlight now: %lu\n", value); |
| 243 | if (!read_ec_data(priv->adev->handle, VPCCMD_R_BL_POWER, &value)) | 322 | if (!read_ec_data(priv->adev->handle, VPCCMD_R_BL_POWER, &value)) |
| 244 | seq_printf(s, "BL power value:\t%s\n", value ? "On" : "Off"); | 323 | seq_printf(s, "BL power value: %s (%lu)\n", value ? "on" : "off", value); |
| 245 | seq_printf(s, "=====================\n"); | 324 | |
| 325 | seq_puts(s, "=====================\n"); | ||
| 246 | 326 | ||
| 247 | if (!read_ec_data(priv->adev->handle, VPCCMD_R_RF, &value)) | 327 | if (!read_ec_data(priv->adev->handle, VPCCMD_R_RF, &value)) |
| 248 | seq_printf(s, "Radio status:\t%s(%lu)\n", | 328 | seq_printf(s, "Radio status: %s (%lu)\n", value ? "on" : "off", value); |
| 249 | value ? "On" : "Off", value); | ||
| 250 | if (!read_ec_data(priv->adev->handle, VPCCMD_R_WIFI, &value)) | 329 | if (!read_ec_data(priv->adev->handle, VPCCMD_R_WIFI, &value)) |
| 251 | seq_printf(s, "Wifi status:\t%s(%lu)\n", | 330 | seq_printf(s, "Wifi status: %s (%lu)\n", value ? "on" : "off", value); |
| 252 | value ? "On" : "Off", value); | ||
| 253 | if (!read_ec_data(priv->adev->handle, VPCCMD_R_BT, &value)) | 331 | if (!read_ec_data(priv->adev->handle, VPCCMD_R_BT, &value)) |
| 254 | seq_printf(s, "BT status:\t%s(%lu)\n", | 332 | seq_printf(s, "BT status: %s (%lu)\n", value ? "on" : "off", value); |
| 255 | value ? "On" : "Off", value); | ||
| 256 | if (!read_ec_data(priv->adev->handle, VPCCMD_R_3G, &value)) | 333 | if (!read_ec_data(priv->adev->handle, VPCCMD_R_3G, &value)) |
| 257 | seq_printf(s, "3G status:\t%s(%lu)\n", | 334 | seq_printf(s, "3G status: %s (%lu)\n", value ? "on" : "off", value); |
| 258 | value ? "On" : "Off", value); | 335 | |
| 259 | seq_printf(s, "=====================\n"); | 336 | seq_puts(s, "=====================\n"); |
| 260 | 337 | ||
| 261 | if (!read_ec_data(priv->adev->handle, VPCCMD_R_TOUCHPAD, &value)) | 338 | if (!read_ec_data(priv->adev->handle, VPCCMD_R_TOUCHPAD, &value)) |
| 262 | seq_printf(s, "Touchpad status:%s(%lu)\n", | 339 | seq_printf(s, "Touchpad status: %s (%lu)\n", value ? "on" : "off", value); |
| 263 | value ? "On" : "Off", value); | ||
| 264 | if (!read_ec_data(priv->adev->handle, VPCCMD_R_CAMERA, &value)) | 340 | if (!read_ec_data(priv->adev->handle, VPCCMD_R_CAMERA, &value)) |
| 265 | seq_printf(s, "Camera status:\t%s(%lu)\n", | 341 | seq_printf(s, "Camera status: %s (%lu)\n", value ? "on" : "off", value); |
| 266 | value ? "On" : "Off", value); | 342 | |
| 267 | seq_puts(s, "=====================\n"); | 343 | seq_puts(s, "=====================\n"); |
| 268 | 344 | ||
| 269 | if (!method_gbmd(priv->adev->handle, &value)) { | 345 | if (!eval_gbmd(priv->adev->handle, &value)) |
| 270 | seq_printf(s, "Conservation mode:\t%s(%lu)\n", | 346 | seq_printf(s, "GBMD: %#010lx\n", value); |
| 271 | test_bit(BM_CONSERVATION_BIT, &value) ? "On" : "Off", | 347 | if (!eval_hals(priv->adev->handle, &value)) |
| 272 | value); | 348 | seq_printf(s, "HALS: %#010lx\n", value); |
| 273 | } | ||
| 274 | 349 | ||
| 275 | return 0; | 350 | return 0; |
| 276 | } | 351 | } |
| @@ -280,39 +355,41 @@ static int debugfs_cfg_show(struct seq_file *s, void *data) · 3 unmodified lines | |||
| 280 | { | 355 | { |
| 281 | struct ideapad_private *priv = s->private; | 356 | struct ideapad_private *priv = s->private; |
| 282 | 357 | ||
| 283 | if (!priv) { | 358 | seq_printf(s, "_CFG: %#010lx\n\n", priv->cfg); |
| 284 | seq_printf(s, "cfg: N/A\n"); | 359 | |
| 285 | } else { | 360 | seq_puts(s, "Capabilities:"); |
| 286 | seq_printf(s, "cfg: 0x%.8lX\n\nCapability: ", | 361 | if (test_bit(CFG_CAP_BT_BIT, &priv->cfg)) |
| 287 | priv->cfg); | 362 | seq_puts(s, " bluetooth"); |
| 288 | if (test_bit(CFG_BT_BIT, &priv->cfg)) | 363 | if (test_bit(CFG_CAP_3G_BIT, &priv->cfg)) |
| 289 | seq_printf(s, "Bluetooth "); | 364 | seq_puts(s, " 3G"); |
| 290 | if (test_bit(CFG_3G_BIT, &priv->cfg)) | 365 | if (test_bit(CFG_CAP_WIFI_BIT, &priv->cfg)) |
| 291 | seq_printf(s, "3G "); | 366 | seq_puts(s, " wifi"); |
| 292 | if (test_bit(CFG_WIFI_BIT, &priv->cfg)) | 367 | if (test_bit(CFG_CAP_CAM_BIT, &priv->cfg)) |
| 293 | seq_printf(s, "Wireless "); | 368 | seq_puts(s, " camera"); |
| 294 | if (test_bit(CFG_CAMERA_BIT, &priv->cfg)) | 369 | if (test_bit(CFG_CAP_TOUCHPAD_BIT, &priv->cfg)) |
| 295 | seq_printf(s, "Camera "); | 370 | seq_puts(s, " touchpad"); |
| 296 | seq_printf(s, "\nGraphic: "); | 371 | seq_puts(s, "\n"); |
| 297 | switch ((priv->cfg)&0x700) { | 372 | |
| 298 | case 0x100: | 373 | seq_puts(s, "Graphics: "); |
| 299 | seq_printf(s, "Intel"); | 374 | switch (priv->cfg & 0x700) { |
| 300 | break; | 375 | case 0x100: |
| 301 | case 0x200: | 376 | seq_puts(s, "Intel"); |
| 302 | seq_printf(s, "ATI"); | 377 | break; |
| 303 | break; | 378 | case 0x200: |
| 304 | case 0x300: | 379 | seq_puts(s, "ATI"); |
| 305 | seq_printf(s, "Nvidia"); | 380 | break; |
| 306 | break; | 381 | case 0x300: |
| 307 | case 0x400: | 382 | seq_puts(s, "Nvidia"); |
| 308 | seq_printf(s, "Intel and ATI"); | 383 | break; |
| 309 | break; | 384 | case 0x400: |
| 310 | case 0x500: | 385 | seq_puts(s, "Intel and ATI"); |
| 311 | seq_printf(s, "Intel and Nvidia"); | 386 | break; |
| 312 | break; | 387 | case 0x500: |
| 313 | } | 388 | seq_puts(s, "Intel and Nvidia"); |
| 314 | seq_printf(s, "\n"); | 389 | break; |
| 315 | } | 390 | } |
| 391 | seq_puts(s, "\n"); | ||
| 392 | |||
| 316 | return 0; | 393 | return 0; |
| 317 | } | 394 | } |
| 318 | DEFINE_SHOW_ATTRIBUTE(debugfs_cfg); | 395 | DEFINE_SHOW_ATTRIBUTE(debugfs_cfg); |
| @@ -324,8 +401,8 @@ static void ideapad_debugfs_init(struct ideapad_private *priv) · 5 unmodified lines | |||
| 324 | dir = debugfs_create_dir("ideapad", NULL); | 401 | dir = debugfs_create_dir("ideapad", NULL); |
| 325 | priv->debug = dir; | 402 | priv->debug = dir; |
| 326 | 403 | ||
| 327 | debugfs_create_file("cfg", S_IRUGO, dir, priv, &debugfs_cfg_fops); | 404 | debugfs_create_file("cfg", 0444, dir, priv, &debugfs_cfg_fops); |
| 328 | debugfs_create_file("status", S_IRUGO, dir, priv, &debugfs_status_fops); | 405 | debugfs_create_file("status", 0444, dir, priv, &debugfs_status_fops); |
| 329 | } | 406 | } |
| 330 | 407 | ||
| 331 | static void ideapad_debugfs_exit(struct ideapad_private *priv) | 408 | static void ideapad_debugfs_exit(struct ideapad_private *priv) |
| @@ -337,209 +414,256 @@ static void ideapad_debugfs_exit(struct ideapad_private *priv) · 5 unmodified lines | |||
| 337 | /* | 414 | /* |
| 338 | * sysfs | 415 | * sysfs |
| 339 | */ | 416 | */ |
| 340 | static ssize_t show_ideapad_cam(struct device *dev, | 417 | static ssize_t camera_power_show(struct device *dev, |
| 341 | struct device_attribute *attr, | 418 | struct device_attribute *attr, |
| 342 | char *buf) | 419 | char *buf) |
| 343 | { | 420 | { |
| 344 | unsigned long result; | ||
| 345 | struct ideapad_private *priv = dev_get_drvdata(dev); | 421 | struct ideapad_private *priv = dev_get_drvdata(dev); |
| 422 | unsigned long result; | ||
| 423 | int err; | ||
| 346 | 424 | ||
| 347 | if (read_ec_data(priv->adev->handle, VPCCMD_R_CAMERA, &result)) | 425 | err = read_ec_data(priv->adev->handle, VPCCMD_R_CAMERA, &result); |
| 348 | return sprintf(buf, "-1\n"); | 426 | if (err) |
| 349 | return sprintf(buf, "%lu\n", result); | 427 | return err; |
| 428 | |||
| 429 | return sysfs_emit(buf, "%d\n", !!result); | ||
| 350 | } | 430 | } |
| 351 | 431 | ||
| 352 | static ssize_t store_ideapad_cam(struct device *dev, | 432 | static ssize_t camera_power_store(struct device *dev, |
| 353 | struct device_attribute *attr, | 433 | struct device_attribute *attr, |
| 354 | const char *buf, size_t count) | 434 | const char *buf, size_t count) |
| 355 | { | 435 | { |
| 356 | int ret, state; | ||
| 357 | struct ideapad_private *priv = dev_get_drvdata(dev); | 436 | struct ideapad_private *priv = dev_get_drvdata(dev); |
| 437 | bool state; | ||
| 438 | int err; | ||
| 439 | |||
| 440 | err = kstrtobool(buf, &state); | ||
| 441 | if (err) | ||
| 442 | return err; | ||
| 443 | |||
| 444 | err = write_ec_cmd(priv->adev->handle, VPCCMD_W_CAMERA, state); | ||
| 445 | if (err) | ||
| 446 | return err; | ||
| 358 | 447 | ||
| 359 | if (!count) | ||
| 360 | return 0; | ||
| 361 | if (sscanf(buf, "%i", &state) != 1) | ||
| 362 | return -EINVAL; | ||
| 363 | ret = write_ec_cmd(priv->adev->handle, VPCCMD_W_CAMERA, state); | ||
| 364 | if (ret < 0) | ||
| 365 | return -EIO; | ||
| 366 | return count; | 448 | return count; |
| 367 | } | 449 | } |
| 368 | 450 | ||
| 369 | static DEVICE_ATTR(camera_power, 0644, show_ideapad_cam, store_ideapad_cam); | 451 | static DEVICE_ATTR_RW(camera_power); |
| 370 | 452 | ||
| 371 | static ssize_t show_ideapad_fan(struct device *dev, | 453 | static ssize_t conservation_mode_show(struct device *dev, |
| 372 | struct device_attribute *attr, | 454 | struct device_attribute *attr, |
| 373 | char *buf) | 455 | char *buf) |
| 374 | { | 456 | { |
| 375 | unsigned long result; | ||
| 376 | struct ideapad_private *priv = dev_get_drvdata(dev); | 457 | struct ideapad_private *priv = dev_get_drvdata(dev); |
| 458 | unsigned long result; | ||
| 459 | int err; | ||
| 460 | |||
| 461 | err = eval_gbmd(priv->adev->handle, &result); | ||
| 462 | if (err) | ||
| 463 | return err; | ||
| 377 | 464 | ||
| 378 | if (read_ec_data(priv->adev->handle, VPCCMD_R_FAN, &result)) | 465 | return sysfs_emit(buf, "%d\n", !!test_bit(GBMD_CONSERVATION_STATE_BIT, &result)); |
| 379 | return sprintf(buf, "-1\n"); | ||
| 380 | return sprintf(buf, "%lu\n", result); | ||
| 381 | } | 466 | } |
| 382 | 467 | ||
| 383 | static ssize_t store_ideapad_fan(struct device *dev, | 468 | static ssize_t conservation_mode_store(struct device *dev, |
| 384 | struct device_attribute *attr, | 469 | struct device_attribute *attr, |
| 385 | const char *buf, size_t count) | 470 | const char *buf, size_t count) |
| 386 | { | 471 | { |
| 387 | int ret, state; | ||
| 388 | struct ideapad_private *priv = dev_get_drvdata(dev); | 472 | struct ideapad_private *priv = dev_get_drvdata(dev); |
| 473 | bool state; | ||
| 474 | int err; | ||
| 475 | |||
| 476 | err = kstrtobool(buf, &state); | ||
| 477 | if (err) | ||
| 478 | return err; | ||
| 479 | |||
| 480 | err = exec_smbc(priv->adev->handle, state ? SMBC_CONSERVATION_ON : SMBC_CONSERVATION_OFF); | ||
| 481 | if (err) | ||
| 482 | return err; | ||
| 389 | 483 | ||
| 390 | if (!count) | ||
| 391 | return 0; | ||
| 392 | if (sscanf(buf, "%i", &state) != 1) | ||
| 393 | return -EINVAL; | ||
| 394 | if (state < 0 || state > 4 || state == 3) | ||
| 395 | return -EINVAL; | ||
| 396 | ret = write_ec_cmd(priv->adev->handle, VPCCMD_W_FAN, state); | ||
| 397 | if (ret < 0) | ||
| 398 | return -EIO; | ||
| 399 | return count; | 484 | return count; |
| 400 | } | 485 | } |
| 401 | 486 | ||
| 402 | static DEVICE_ATTR(fan_mode, 0644, show_ideapad_fan, store_ideapad_fan); | 487 | static DEVICE_ATTR_RW(conservation_mode); |
| 403 | 488 | ||
| 404 | static ssize_t touchpad_show(struct device *dev, | 489 | static ssize_t fan_mode_show(struct device *dev, |
| 405 | struct device_attribute *attr, | 490 | struct device_attribute *attr, |
| 406 | char *buf) | 491 | char *buf) |
| 407 | { | 492 | { |
| 408 | struct ideapad_private *priv = dev_get_drvdata(dev); | 493 | struct ideapad_private *priv = dev_get_drvdata(dev); |
| 409 | unsigned long result; | 494 | unsigned long result; |
| 495 | int err; | ||
| 496 | |||
| 497 | err = read_ec_data(priv->adev->handle, VPCCMD_R_FAN, &result); | ||
| 498 | if (err) | ||
| 499 | return err; | ||
| 410 | 500 | ||
| 411 | if (read_ec_data(priv->adev->handle, VPCCMD_R_TOUCHPAD, &result)) | 501 | return sysfs_emit(buf, "%lu\n", result); |
| 412 | return sprintf(buf, "-1\n"); | ||
| 413 | return sprintf(buf, "%lu\n", result); | ||
| 414 | } | 502 | } |
| 415 | 503 | ||
| 416 | /* Switch to RO for now: It might be revisited in the future */ | 504 | static ssize_t fan_mode_store(struct device *dev, |
| 417 | static ssize_t __maybe_unused touchpad_store(struct device *dev, | 505 | struct device_attribute *attr, |
| 418 | struct device_attribute *attr, | 506 | const char *buf, size_t count) |
| 419 | const char *buf, size_t count) | ||
| 420 | { | 507 | { |
| 421 | struct ideapad_private *priv = dev_get_drvdata(dev); | 508 | struct ideapad_private *priv = dev_get_drvdata(dev); |
| 422 | bool state; | 509 | unsigned int state; |
| 423 | int ret; | 510 | int err; |
| 424 | 511 | ||
| 425 | ret = kstrtobool(buf, &state); | 512 | err = kstrtouint(buf, 0, &state); |
| 426 | if (ret) | 513 | if (err) |
| 427 | return ret; | 514 | return err; |
| 515 | |||
| 516 | if (state > 4 || state == 3) | ||
| 517 | return -EINVAL; | ||
| 518 | |||
| 519 | err = write_ec_cmd(priv->adev->handle, VPCCMD_W_FAN, state); | ||
| 520 | if (err) | ||
| 521 | return err; | ||
| 428 | 522 | ||
| 429 | ret = write_ec_cmd(priv->adev->handle, VPCCMD_W_TOUCHPAD, state); | ||
| 430 | if (ret < 0) | ||
| 431 | return -EIO; | ||
| 432 | return count; | 523 | return count; |
| 433 | } | 524 | } |
| 434 | 525 | ||
| 435 | static DEVICE_ATTR_RO(touchpad); | 526 | static DEVICE_ATTR_RW(fan_mode); |
| 436 | 527 | ||
| 437 | static ssize_t conservation_mode_show(struct device *dev, | 528 | static ssize_t fn_lock_show(struct device *dev, |
| 438 | struct device_attribute *attr, | 529 | struct device_attribute *attr, |
| 439 | char *buf) | 530 | char *buf) |
| 440 | { | 531 | { |
| 441 | struct ideapad_private *priv = dev_get_drvdata(dev); | 532 | struct ideapad_private *priv = dev_get_drvdata(dev); |
| 442 | unsigned long result; | 533 | unsigned long hals; |
| 534 | int err; | ||
| 443 | 535 | ||
| 444 | if (method_gbmd(priv->adev->handle, &result)) | 536 | err = eval_hals(priv->adev->handle, &hals); |
| 445 | return sprintf(buf, "-1\n"); | 537 | if (err) |
| 446 | return sprintf(buf, "%u\n", test_bit(BM_CONSERVATION_BIT, &result)); | 538 | return err; |
| 539 | |||
| 540 | return sysfs_emit(buf, "%d\n", !!test_bit(HALS_FNLOCK_STATE_BIT, &hals)); | ||
| 447 | } | 541 | } |
| 448 | 542 | ||
| 449 | static ssize_t conservation_mode_store(struct device *dev, | 543 | static ssize_t fn_lock_store(struct device *dev, |
| 450 | struct device_attribute *attr, | 544 | struct device_attribute *attr, |
| 451 | const char *buf, size_t count) | 545 | const char *buf, size_t count) |
| 452 | { | 546 | { |
| 453 | struct ideapad_private *priv = dev_get_drvdata(dev); | 547 | struct ideapad_private *priv = dev_get_drvdata(dev); |
| 454 | bool state; | 548 | bool state; |
| 455 | int ret; | 549 | int err; |
| 456 | 550 | ||
| 457 | ret = kstrtobool(buf, &state); | 551 | err = kstrtobool(buf, &state); |
| 458 | if (ret) | 552 | if (err) |
| 459 | return ret; | 553 | return err; |
| 554 | |||
| 555 | err = exec_sals(priv->adev->handle, state ? SALS_FNLOCK_ON : SALS_FNLOCK_OFF); | ||
| 556 | if (err) | ||
| 557 | return err; | ||
| 460 | 558 | ||
| 461 | ret = method_int1(priv->adev->handle, "SBMC", state ? | ||
| 462 | BMCMD_CONSERVATION_ON : | ||
| 463 | BMCMD_CONSERVATION_OFF); | ||
| 464 | if (ret < 0) | ||
| 465 | return -EIO; | ||
| 466 | return count; | 559 | return count; |
| 467 | } | 560 | } |
| 468 | 561 | ||
| 469 | static DEVICE_ATTR_RW(conservation_mode); | 562 | static DEVICE_ATTR_RW(fn_lock); |
| 470 | 563 | ||
| 471 | static ssize_t fn_lock_show(struct device *dev, | 564 | static ssize_t touchpad_show(struct device *dev, |
| 472 | struct device_attribute *attr, | 565 | struct device_attribute *attr, |
| 473 | char *buf) | 566 | char *buf) |
| 474 | { | 567 | { |
| 475 | struct ideapad_private *priv = dev_get_drvdata(dev); | 568 | struct ideapad_private *priv = dev_get_drvdata(dev); |
| 476 | unsigned long result; | 569 | unsigned long result; |
| 477 | int hals; | 570 | int err; |
| 478 | int fail = read_method_int(priv->adev->handle, "HALS", &hals); | ||
| 479 | 571 | ||
| 480 | if (fail) | 572 | err = read_ec_data(priv->adev->handle, VPCCMD_R_TOUCHPAD, &result); |
| 481 | return sprintf(buf, "-1\n"); | 573 | if (err) |
| 574 | return err; | ||
| 482 | 575 | ||
| 483 | result = hals; | 576 | return sysfs_emit(buf, "%d\n", !!result); |
| 484 | return sprintf(buf, "%u\n", test_bit(HA_FNLOCK_BIT, &result)); | ||
| 485 | } | 577 | } |
| 486 | 578 | ||
| 487 | static ssize_t fn_lock_store(struct device *dev, | 579 | static ssize_t touchpad_store(struct device *dev, |
| 488 | struct device_attribute *attr, | 580 | struct device_attribute *attr, |
| 489 | const char *buf, size_t count) | 581 | const char *buf, size_t count) |
| 490 | { | 582 | { |
| 491 | struct ideapad_private *priv = dev_get_drvdata(dev); | 583 | struct ideapad_private *priv = dev_get_drvdata(dev); |
| 492 | bool state; | 584 | bool state; |
| 493 | int ret; | 585 | int err; |
| 494 | 586 | ||
| 495 | ret = kstrtobool(buf, &state); | 587 | err = kstrtobool(buf, &state); |
| 496 | if (ret) | 588 | if (err) |
| 497 | return ret; | 589 | return err; |
| 590 | |||
| 591 | err = write_ec_cmd(priv->adev->handle, VPCCMD_W_TOUCHPAD, state); | ||
| 592 | if (err) | ||
| 593 | return err; | ||
| 498 | 594 | ||
| 499 | ret = method_int1(priv->adev->handle, "SALS", state ? | ||
| 500 | HACMD_FNLOCK_ON : | ||
| 501 | HACMD_FNLOCK_OFF); | ||
| 502 | if (ret < 0) | ||
| 503 | return -EIO; | ||
| 504 | return count; | 595 | return count; |
| 505 | } | 596 | } |
| 506 | 597 | ||
| 507 | static DEVICE_ATTR_RW(fn_lock); | 598 | static DEVICE_ATTR_RW(touchpad); |
| 599 | |||
| 600 | static ssize_t usb_charging_show(struct device *dev, | ||
| 601 | struct device_attribute *attr, | ||
| 602 | char *buf) | ||
| 603 | { | ||
| 604 | struct ideapad_private *priv = dev_get_drvdata(dev); | ||
| 605 | unsigned long hals; | ||
| 606 | int err; | ||
| 607 | |||
| 608 | err = eval_hals(priv->adev->handle, &hals); | ||
| 609 | if (err) | ||
| 610 | return err; | ||
| 611 | |||
| 612 | return sysfs_emit(buf, "%d\n", !!test_bit(HALS_USB_CHARGING_STATE_BIT, &hals)); | ||
| 613 | } | ||
| 508 | 614 | ||
| 615 | static ssize_t usb_charging_store(struct device *dev, | ||
| 616 | struct device_attribute *attr, | ||
| 617 | const char *buf, size_t count) | ||
| 618 | { | ||
| 619 | struct ideapad_private *priv = dev_get_drvdata(dev); | ||
| 620 | bool state; | ||
| 621 | int err; | ||
| 622 | |||
| 623 | err = kstrtobool(buf, &state); | ||
| 624 | if (err) | ||
| 625 | return err; | ||
| 626 | |||
| 627 | err = exec_sals(priv->adev->handle, state ? SALS_USB_CHARGING_ON : SALS_USB_CHARGING_OFF); | ||
| 628 | if (err) | ||
| 629 | return err; | ||
| 630 | |||
| 631 | return count; | ||
| 632 | } | ||
| 633 | |||
| 634 | static DEVICE_ATTR_RW(usb_charging); | ||
| 509 | 635 | ||
| 510 | static struct attribute *ideapad_attributes[] = { | 636 | static struct attribute *ideapad_attributes[] = { |
| 511 | &dev_attr_camera_power.attr, | 637 | &dev_attr_camera_power.attr, |
| 512 | &dev_attr_fan_mode.attr, | ||
| 513 | &dev_attr_touchpad.attr, | ||
| 514 | &dev_attr_conservation_mode.attr, | 638 | &dev_attr_conservation_mode.attr, |
| 639 | &dev_attr_fan_mode.attr, | ||
| 515 | &dev_attr_fn_lock.attr, | 640 | &dev_attr_fn_lock.attr, |
| 641 | &dev_attr_touchpad.attr, | ||
| 642 | &dev_attr_usb_charging.attr, | ||
| 516 | NULL | 643 | NULL |
| 517 | }; | 644 | }; |
| 518 | 645 | ||
| 519 | static umode_t ideapad_is_visible(struct kobject *kobj, | 646 | static umode_t ideapad_is_visible(struct kobject *kobj, |
| 520 | struct attribute *attr, | 647 | struct attribute *attr, |
| 521 | int idx) | 648 | int idx) |
| 522 | { | 649 | { |
| 523 | struct device *dev = container_of(kobj, struct device, kobj); | 650 | struct device *dev = kobj_to_dev(kobj); |
| 524 | struct ideapad_private *priv = dev_get_drvdata(dev); | 651 | struct ideapad_private *priv = dev_get_drvdata(dev); |
| 525 | bool supported; | 652 | bool supported = true; |
| 526 | 653 | ||
| 527 | if (attr == &dev_attr_camera_power.attr) | 654 | if (attr == &dev_attr_camera_power.attr) |
| 528 | supported = test_bit(CFG_CAMERA_BIT, &(priv->cfg)); | 655 | supported = test_bit(CFG_CAP_CAM_BIT, &priv->cfg); |
| 529 | else if (attr == &dev_attr_fan_mode.attr) { | 656 | else if (attr == &dev_attr_conservation_mode.attr) |
| 530 | unsigned long value; | 657 | supported = priv->features.conservation_mode; |
| 531 | supported = !read_ec_data(priv->adev->handle, VPCCMD_R_FAN, | 658 | else if (attr == &dev_attr_fan_mode.attr) |
| 532 | &value); | 659 | supported = priv->features.fan_mode; |
| 533 | } else if (attr == &dev_attr_conservation_mode.attr) { | 660 | else if (attr == &dev_attr_fn_lock.attr) |
| 534 | supported = acpi_has_method(priv->adev->handle, "GBMD") && | 661 | supported = priv->features.fn_lock; |
| 535 | acpi_has_method(priv->adev->handle, "SBMC"); | 662 | else if (attr == &dev_attr_touchpad.attr) |
| 536 | } else if (attr == &dev_attr_fn_lock.attr) { | 663 | supported = priv->features.touchpad_ctrl_via_ec && |
| 537 | supported = acpi_has_method(priv->adev->handle, "HALS") && | 664 | test_bit(CFG_CAP_TOUCHPAD_BIT, &priv->cfg); |
| 538 | acpi_has_method(priv->adev->handle, "SALS"); | 665 | else if (attr == &dev_attr_usb_charging.attr) |
| 539 | } else if (attr == &dev_attr_touchpad.attr) | 666 | supported = priv->features.usb_charging; |
| 540 | supported = priv->has_touchpad_switch; | ||
| 541 | else | ||
| 542 | supported = true; | ||
| 543 | 667 | ||
| 544 | return supported ? attr->mode : 0; | 668 | return supported ? attr->mode : 0; |
| 545 | } | 669 | } |
| @@ -549,6 +673,265 @@ static const struct attribute_group ideapad_attribute_group = { · 3 unmodified lines | |||
| 549 | .attrs = ideapad_attributes | 673 | .attrs = ideapad_attributes |
| 550 | }; | 674 | }; |
| 551 | 675 | ||
| 676 | /* | ||
| 677 | * DYTC Platform profile | ||
| 678 | */ | ||
| 679 | #define DYTC_CMD_QUERY 0 /* To get DYTC status - enable/revision */ | ||
| 680 | #define DYTC_CMD_SET 1 /* To enable/disable IC function mode */ | ||
| 681 | #define DYTC_CMD_GET 2 /* To get current IC function and mode */ | ||
| 682 | #define DYTC_CMD_RESET 0x1ff /* To reset back to default */ | ||
| 683 | |||
| 684 | #define DYTC_QUERY_ENABLE_BIT 8 /* Bit 8 - 0 = disabled, 1 = enabled */ | ||
| 685 | #define DYTC_QUERY_SUBREV_BIT 16 /* Bits 16 - 27 - sub revision */ | ||
| 686 | #define DYTC_QUERY_REV_BIT 28 /* Bits 28 - 31 - revision */ | ||
| 687 | |||
| 688 | #define DYTC_GET_FUNCTION_BIT 8 /* Bits 8-11 - function setting */ | ||
| 689 | #define DYTC_GET_MODE_BIT 12 /* Bits 12-15 - mode setting */ | ||
| 690 | |||
| 691 | #define DYTC_SET_FUNCTION_BIT 12 /* Bits 12-15 - function setting */ | ||
| 692 | #define DYTC_SET_MODE_BIT 16 /* Bits 16-19 - mode setting */ | ||
| 693 | #define DYTC_SET_VALID_BIT 20 /* Bit 20 - 1 = on, 0 = off */ | ||
| 694 | |||
| 695 | #define DYTC_FUNCTION_STD 0 /* Function = 0, standard mode */ | ||
| 696 | #define DYTC_FUNCTION_CQL 1 /* Function = 1, lap mode */ | ||
| 697 | #define DYTC_FUNCTION_MMC 11 /* Function = 11, desk mode */ | ||
| 698 | |||
| 699 | #define DYTC_MODE_PERFORM 2 /* High power mode aka performance */ | ||
| 700 | #define DYTC_MODE_LOW_POWER 3 /* Low power mode aka quiet */ | ||
| 701 | #define DYTC_MODE_BALANCE 0xF /* Default mode aka balanced */ | ||
| 702 | |||
| 703 | #define DYTC_SET_COMMAND(function, mode, on) \ | ||
| 704 | (DYTC_CMD_SET | (function) << DYTC_SET_FUNCTION_BIT | \ | ||
| 705 | (mode) << DYTC_SET_MODE_BIT | \ | ||
| 706 | (on) << DYTC_SET_VALID_BIT) | ||
| 707 | |||
| 708 | #define DYTC_DISABLE_CQL DYTC_SET_COMMAND(DYTC_FUNCTION_CQL, DYTC_MODE_BALANCE, 0) | ||
| 709 | |||
| 710 | #define DYTC_ENABLE_CQL DYTC_SET_COMMAND(DYTC_FUNCTION_CQL, DYTC_MODE_BALANCE, 1) | ||
| 711 | |||
| 712 | static int convert_dytc_to_profile(int dytcmode, enum platform_profile_option *profile) | ||
| 713 | { | ||
| 714 | switch (dytcmode) { | ||
| 715 | case DYTC_MODE_LOW_POWER: | ||
| 716 | *profile = PLATFORM_PROFILE_LOW_POWER; | ||
| 717 | break; | ||
| 718 | case DYTC_MODE_BALANCE: | ||
| 719 | *profile = PLATFORM_PROFILE_BALANCED; | ||
| 720 | break; | ||
| 721 | case DYTC_MODE_PERFORM: | ||
| 722 | *profile = PLATFORM_PROFILE_PERFORMANCE; | ||
| 723 | break; | ||
| 724 | default: /* Unknown mode */ | ||
| 725 | return -EINVAL; | ||
| 726 | } | ||
| 727 | |||
| 728 | return 0; | ||
| 729 | } | ||
| 730 | |||
| 731 | static int convert_profile_to_dytc(enum platform_profile_option profile, int *perfmode) | ||
| 732 | { | ||
| 733 | switch (profile) { | ||
| 734 | case PLATFORM_PROFILE_LOW_POWER: | ||
| 735 | *perfmode = DYTC_MODE_LOW_POWER; | ||
| 736 | break; | ||
| 737 | case PLATFORM_PROFILE_BALANCED: | ||
| 738 | *perfmode = DYTC_MODE_BALANCE; | ||
| 739 | break; | ||
| 740 | case PLATFORM_PROFILE_PERFORMANCE: | ||
| 741 | *perfmode = DYTC_MODE_PERFORM; | ||
| 742 | break; | ||
| 743 | default: /* Unknown profile */ | ||
| 744 | return -EOPNOTSUPP; | ||
| 745 | } | ||
| 746 | |||
| 747 | return 0; | ||
| 748 | } | ||
| 749 | |||
| 750 | /* | ||
| 751 | * dytc_profile_get: Function to register with platform_profile | ||
| 752 | * handler. Returns current platform profile. | ||
| 753 | */ | ||
| 754 | static int dytc_profile_get(struct platform_profile_handler *pprof, | ||
| 755 | enum platform_profile_option *profile) | ||
| 756 | { | ||
| 757 | struct ideapad_dytc_priv *dytc = container_of(pprof, struct ideapad_dytc_priv, pprof); | ||
| 758 | |||
| 759 | *profile = dytc->current_profile; | ||
| 760 | return 0; | ||
| 761 | } | ||
| 762 | |||
| 763 | /* | ||
| 764 | * Helper function - check if we are in CQL mode and if we are | ||
| 765 | * - disable CQL, | ||
| 766 | * - run the command | ||
| 767 | * - enable CQL | ||
| 768 | * If not in CQL mode, just run the command | ||
| 769 | */ | ||
| 770 | static int dytc_cql_command(struct ideapad_private *priv, unsigned long cmd, | ||
| 771 | unsigned long *output) | ||
| 772 | { | ||
| 773 | int err, cmd_err, cur_funcmode; | ||
| 774 | |||
| 775 | /* Determine if we are in CQL mode. This alters the commands we do */ | ||
| 776 | err = eval_dytc(priv->adev->handle, DYTC_CMD_GET, output); | ||
| 777 | if (err) | ||
| 778 | return err; | ||
| 779 | |||
| 780 | cur_funcmode = (*output >> DYTC_GET_FUNCTION_BIT) & 0xF; | ||
| 781 | /* Check if we're OK to return immediately */ | ||
| 782 | if (cmd == DYTC_CMD_GET && cur_funcmode != DYTC_FUNCTION_CQL) | ||
| 783 | return 0; | ||
| 784 | |||
| 785 | if (cur_funcmode == DYTC_FUNCTION_CQL) { | ||
| 786 | err = eval_dytc(priv->adev->handle, DYTC_DISABLE_CQL, NULL); | ||
| 787 | if (err) | ||
| 788 | return err; | ||
| 789 | } | ||
| 790 | |||
| 791 | cmd_err = eval_dytc(priv->adev->handle, cmd, output); | ||
| 792 | /* Check return condition after we've restored CQL state */ | ||
| 793 | |||
| 794 | if (cur_funcmode == DYTC_FUNCTION_CQL) { | ||
| 795 | err = eval_dytc(priv->adev->handle, DYTC_ENABLE_CQL, NULL); | ||
| 796 | if (err) | ||
| 797 | return err; | ||
| 798 | } | ||
| 799 | |||
| 800 | return cmd_err; | ||
| 801 | } | ||
| 802 | |||
| 803 | /* | ||
| 804 | * dytc_profile_set: Function to register with platform_profile | ||
| 805 | * handler. Sets current platform profile. | ||
| 806 | */ | ||
| 807 | static int dytc_profile_set(struct platform_profile_handler *pprof, | ||
| 808 | enum platform_profile_option profile) | ||
| 809 | { | ||
| 810 | struct ideapad_dytc_priv *dytc = container_of(pprof, struct ideapad_dytc_priv, pprof); | ||
| 811 | struct ideapad_private *priv = dytc->priv; | ||
| 812 | int err; | ||
| 813 | |||
| 814 | err = mutex_lock_interruptible(&dytc->mutex); | ||
| 815 | if (err) | ||
| 816 | return err; | ||
| 817 | |||
| 818 | if (profile == PLATFORM_PROFILE_BALANCED) { | ||
| 819 | /* To get back to balanced mode we just issue a reset command */ | ||
| 820 | err = eval_dytc(priv->adev->handle, DYTC_CMD_RESET, NULL); | ||
| 821 | if (err) | ||
| 822 | goto unlock; | ||
| 823 | } else { | ||
| 824 | int perfmode; | ||
| 825 | |||
| 826 | err = convert_profile_to_dytc(profile, &perfmode); | ||
| 827 | if (err) | ||
| 828 | goto unlock; | ||
| 829 | |||
| 830 | /* Determine if we are in CQL mode. This alters the commands we do */ | ||
| 831 | err = dytc_cql_command(priv, DYTC_SET_COMMAND(DYTC_FUNCTION_MMC, perfmode, 1), | ||
| 832 | NULL); | ||
| 833 | if (err) | ||
| 834 | goto unlock; | ||
| 835 | } | ||
| 836 | |||
| 837 | /* Success - update current profile */ | ||
| 838 | dytc->current_profile = profile; | ||
| 839 | |||
| 840 | unlock: | ||
| 841 | mutex_unlock(&dytc->mutex); | ||
| 842 | |||
| 843 | return err; | ||
| 844 | } | ||
| 845 | |||
| 846 | static void dytc_profile_refresh(struct ideapad_private *priv) | ||
| 847 | { | ||
| 848 | enum platform_profile_option profile; | ||
| 849 | unsigned long output; | ||
| 850 | int err, perfmode; | ||
| 851 | |||
| 852 | mutex_lock(&priv->dytc->mutex); | ||
| 853 | err = dytc_cql_command(priv, DYTC_CMD_GET, &output); | ||
| 854 | mutex_unlock(&priv->dytc->mutex); | ||
| 855 | if (err) | ||
| 856 | return; | ||
| 857 | |||
| 858 | perfmode = (output >> DYTC_GET_MODE_BIT) & 0xF; | ||
| 859 | |||
| 860 | if (convert_dytc_to_profile(perfmode, &profile)) | ||
| 861 | return; | ||
| 862 | |||
| 863 | if (profile != priv->dytc->current_profile) { | ||
| 864 | priv->dytc->current_profile = profile; | ||
| 865 | platform_profile_notify(); | ||
| 866 | } | ||
| 867 | } | ||
| 868 | |||
| 869 | static int ideapad_dytc_profile_init(struct ideapad_private *priv) | ||
| 870 | { | ||
| 871 | int err, dytc_version; | ||
| 872 | unsigned long output; | ||
| 873 | |||
| 874 | if (!priv->features.dytc) | ||
| 875 | return -ENODEV; | ||
| 876 | |||
| 877 | err = eval_dytc(priv->adev->handle, DYTC_CMD_QUERY, &output); | ||
| 878 | /* For all other errors we can flag the failure */ | ||
| 879 | if (err) | ||
| 880 | return err; | ||
| 881 | |||
| 882 | /* Check DYTC is enabled and supports mode setting */ | ||
| 883 | if (!test_bit(DYTC_QUERY_ENABLE_BIT, &output)) | ||
| 884 | return -ENODEV; | ||
| 885 | |||
| 886 | dytc_version = (output >> DYTC_QUERY_REV_BIT) & 0xF; | ||
| 887 | if (dytc_version < 5) | ||
| 888 | return -ENODEV; | ||
| 889 | |||
| 890 | priv->dytc = kzalloc(sizeof(*priv->dytc), GFP_KERNEL); | ||
| 891 | if (!priv->dytc) | ||
| 892 | return -ENOMEM; | ||
| 893 | |||
| 894 | mutex_init(&priv->dytc->mutex); | ||
| 895 | |||
| 896 | priv->dytc->priv = priv; | ||
| 897 | priv->dytc->pprof.profile_get = dytc_profile_get; | ||
| 898 | priv->dytc->pprof.profile_set = dytc_profile_set; | ||
| 899 | |||
| 900 | /* Setup supported modes */ | ||
| 901 | set_bit(PLATFORM_PROFILE_LOW_POWER, priv->dytc->pprof.choices); | ||
| 902 | set_bit(PLATFORM_PROFILE_BALANCED, priv->dytc->pprof.choices); | ||
| 903 | set_bit(PLATFORM_PROFILE_PERFORMANCE, priv->dytc->pprof.choices); | ||
| 904 | |||
| 905 | /* Create platform_profile structure and register */ | ||
| 906 | err = platform_profile_register(&priv->dytc->pprof); | ||
| 907 | if (err) | ||
| 908 | goto pp_reg_failed; | ||
| 909 | |||
| 910 | /* Ensure initial values are correct */ | ||
| 911 | dytc_profile_refresh(priv); | ||
| 912 | |||
| 913 | return 0; | ||
| 914 | |||
| 915 | pp_reg_failed: | ||
| 916 | mutex_destroy(&priv->dytc->mutex); | ||
| 917 | kfree(priv->dytc); | ||
| 918 | priv->dytc = NULL; | ||
| 919 | |||
| 920 | return err; | ||
| 921 | } | ||
| 922 | |||
| 923 | static void ideapad_dytc_profile_exit(struct ideapad_private *priv) | ||
| 924 | { | ||
| 925 | if (!priv->dytc) | ||
| 926 | return; | ||
| 927 | |||
| 928 | platform_profile_remove(); | ||
| 929 | mutex_destroy(&priv->dytc->mutex); | ||
| 930 | kfree(priv->dytc); | ||
| 931 | |||
| 932 | priv->dytc = NULL; | ||
| 933 | } | ||
| 934 | |||
| 552 | /* | 935 | /* |
| 553 | * Rfkill | 936 | * Rfkill |
| 554 | */ | 937 | */ |
| @@ -560,9 +943,9 @@ struct ideapad_rfk_data { · 5 unmodified lines | |||
| 560 | }; | 943 | }; |
| 561 | 944 | ||
| 562 | static const struct ideapad_rfk_data ideapad_rfk_data[] = { | 945 | static const struct ideapad_rfk_data ideapad_rfk_data[] = { |
| 563 | { "ideapad_wlan", CFG_WIFI_BIT, VPCCMD_W_WIFI, RFKILL_TYPE_WLAN }, | 946 | { "ideapad_wlan", CFG_CAP_WIFI_BIT, VPCCMD_W_WIFI, RFKILL_TYPE_WLAN }, |
| 564 | { "ideapad_bluetooth", CFG_BT_BIT, VPCCMD_W_BT, RFKILL_TYPE_BLUETOOTH }, | 947 | { "ideapad_bluetooth", CFG_CAP_BT_BIT, VPCCMD_W_BT, RFKILL_TYPE_BLUETOOTH }, |
| 565 | { "ideapad_3g", CFG_3G_BIT, VPCCMD_W_3G, RFKILL_TYPE_WWAN }, | 948 | { "ideapad_3g", CFG_CAP_3G_BIT, VPCCMD_W_3G, RFKILL_TYPE_WWAN }, |
| 566 | }; | 949 | }; |
| 567 | 950 | ||
| 568 | static int ideapad_rfk_set(void *data, bool blocked) | 951 | static int ideapad_rfk_set(void *data, bool blocked) |
| @@ -582,7 +965,7 @@ static void ideapad_sync_rfk_state(struct ideapad_private *priv) · 13 unmodified lines | |||
| 582 | unsigned long hw_blocked = 0; | 965 | unsigned long hw_blocked = 0; |
| 583 | int i; | 966 | int i; |
| 584 | 967 | ||
| 585 | if (priv->has_hw_rfkill_switch) { | 968 | if (priv->features.hw_rfkill_switch) { |
| 586 | if (read_ec_data(priv->adev->handle, VPCCMD_R_RF, &hw_blocked)) | 969 | if (read_ec_data(priv->adev->handle, VPCCMD_R_RF, &hw_blocked)) |
| 587 | return; | 970 | return; |
| 588 | hw_blocked = !hw_blocked; | 971 | hw_blocked = !hw_blocked; |
| @@ -595,16 +978,15 @@ static void ideapad_sync_rfk_state(struct ideapad_private *priv) · 6 unmodified lines | |||
| 595 | 978 | ||
| 596 | static int ideapad_register_rfkill(struct ideapad_private *priv, int dev) | 979 | static int ideapad_register_rfkill(struct ideapad_private *priv, int dev) |
| 597 | { | 980 | { |
| 598 | int ret; | 981 | unsigned long rf_enabled; |
| 599 | unsigned long sw_blocked; | 982 | int err; |
| 600 | 983 | ||
| 601 | if (no_bt_rfkill && | 984 | if (no_bt_rfkill && ideapad_rfk_data[dev].type == RFKILL_TYPE_BLUETOOTH) { |
| 602 | (ideapad_rfk_data[dev].type == RFKILL_TYPE_BLUETOOTH)) { | ||
| 603 | /* Force to enable bluetooth when no_bt_rfkill=1 */ | 985 | /* Force to enable bluetooth when no_bt_rfkill=1 */ |
| 604 | write_ec_cmd(priv->adev->handle, | 986 | write_ec_cmd(priv->adev->handle, ideapad_rfk_data[dev].opcode, 1); |
| 605 | ideapad_rfk_data[dev].opcode, 1); | ||
| 606 | return 0; | 987 | return 0; |
| 607 | } | 988 | } |
| 989 | |||
| 608 | priv->rfk_priv[dev].dev = dev; | 990 | priv->rfk_priv[dev].dev = dev; |
| 609 | priv->rfk_priv[dev].priv = priv; | 991 | priv->rfk_priv[dev].priv = priv; |
| 610 | 992 | ||
| @@ -616,20 +998,17 @@ static int ideapad_register_rfkill(struct ideapad_private *priv, int dev) · 5 unmodified lines | |||
| 616 | if (!priv->rfk[dev]) | 998 | if (!priv->rfk[dev]) |
| 617 | return -ENOMEM; | 999 | return -ENOMEM; |
| 618 | 1000 | ||
| 619 | if (read_ec_data(priv->adev->handle, ideapad_rfk_data[dev].opcode-1, | 1001 | err = read_ec_data(priv->adev->handle, ideapad_rfk_data[dev].opcode - 1, &rf_enabled); |
| 620 | &sw_blocked)) { | 1002 | if (err) |
| 621 | rfkill_init_sw_state(priv->rfk[dev], 0); | 1003 | rf_enabled = 1; |
| 622 | } else { | 1004 | |
| 623 | sw_blocked = !sw_blocked; | 1005 | rfkill_init_sw_state(priv->rfk[dev], !rf_enabled); |
| 624 | rfkill_init_sw_state(priv->rfk[dev], sw_blocked); | ||
| 625 | } | ||
| 626 | 1006 | ||
| 627 | ret = rfkill_register(priv->rfk[dev]); | 1007 | err = rfkill_register(priv->rfk[dev]); |
| 628 | if (ret) { | 1008 | if (err) |
| 629 | rfkill_destroy(priv->rfk[dev]); | 1009 | rfkill_destroy(priv->rfk[dev]); |
| 630 | return ret; | 1010 | |
| 631 | } | 1011 | return err; |
| 632 | return 0; | ||
| 633 | } | 1012 | } |
| 634 | 1013 | ||
| 635 | static void ideapad_unregister_rfkill(struct ideapad_private *priv, int dev) | 1014 | static void ideapad_unregister_rfkill(struct ideapad_private *priv, int dev) |
| @@ -646,40 +1025,39 @@ static void ideapad_unregister_rfkill(struct ideapad_private *priv, int dev) · 10 unmodified lines | |||
| 646 | */ | 1025 | */ |
| 647 | static int ideapad_sysfs_init(struct ideapad_private *priv) | 1026 | static int ideapad_sysfs_init(struct ideapad_private *priv) |
| 648 | { | 1027 | { |
| 649 | return sysfs_create_group(&priv->platform_device->dev.kobj, | 1028 | return device_add_group(&priv->platform_device->dev, |
| 650 | &ideapad_attribute_group); | 1029 | &ideapad_attribute_group); |
| 651 | } | 1030 | } |
| 652 | 1031 | ||
| 653 | static void ideapad_sysfs_exit(struct ideapad_private *priv) | 1032 | static void ideapad_sysfs_exit(struct ideapad_private *priv) |
| 654 | { | 1033 | { |
| 655 | sysfs_remove_group(&priv->platform_device->dev.kobj, | 1034 | device_remove_group(&priv->platform_device->dev, |
| 656 | &ideapad_attribute_group); | 1035 | &ideapad_attribute_group); |
| 657 | } | 1036 | } |
| 658 | 1037 | ||
| 659 | /* | 1038 | /* |
| 660 | * input device | 1039 | * input device |
| 661 | */ | 1040 | */ |
| 662 | static const struct key_entry ideapad_keymap[] = { | 1041 | static const struct key_entry ideapad_keymap[] = { |
| 663 | { KE_KEY, 6, { KEY_SWITCHVIDEOMODE } }, | 1042 | { KE_KEY, 6, { KEY_SWITCHVIDEOMODE } }, |
| 664 | { KE_KEY, 7, { KEY_CAMERA } }, | 1043 | { KE_KEY, 7, { KEY_CAMERA } }, |
| 665 | { KE_KEY, 8, { KEY_MICMUTE } }, | 1044 | { KE_KEY, 8, { KEY_MICMUTE } }, |
| 666 | { KE_KEY, 11, { KEY_F16 } }, | 1045 | { KE_KEY, 11, { KEY_F16 } }, |
| 667 | { KE_KEY, 13, { KEY_WLAN } }, | 1046 | { KE_KEY, 13, { KEY_WLAN } }, |
| 668 | { KE_KEY, 16, { KEY_PROG1 } }, | 1047 | { KE_KEY, 16, { KEY_PROG1 } }, |
| 669 | { KE_KEY, 17, { KEY_PROG2 } }, | 1048 | { KE_KEY, 17, { KEY_PROG2 } }, |
| 670 | { KE_KEY, 64, { KEY_PROG3 } }, | 1049 | { KE_KEY, 64, { KEY_PROG3 } }, |
| 671 | { KE_KEY, 65, { KEY_PROG4 } }, | 1050 | { KE_KEY, 65, { KEY_PROG4 } }, |
| 672 | { KE_KEY, 66, { KEY_TOUCHPAD_OFF } }, | 1051 | { KE_KEY, 66, { KEY_TOUCHPAD_OFF } }, |
| 673 | { KE_KEY, 67, { KEY_TOUCHPAD_ON } }, | 1052 | { KE_KEY, 67, { KEY_TOUCHPAD_ON } }, |
| 674 | { KE_KEY, 128, { KEY_ESC } }, | 1053 | { KE_KEY, 128, { KEY_ESC } }, |
| 675 | 1054 | { KE_END }, | |
| 676 | { KE_END, 0 }, | ||
| 677 | }; | 1055 | }; |
| 678 | 1056 | ||
| 679 | static int ideapad_input_init(struct ideapad_private *priv) | 1057 | static int ideapad_input_init(struct ideapad_private *priv) |
| 680 | { | 1058 | { |
| 681 | struct input_dev *inputdev; | 1059 | struct input_dev *inputdev; |
| 682 | int error; | 1060 | int err; |
| 683 | 1061 | ||
| 684 | inputdev = input_allocate_device(); | 1062 | inputdev = input_allocate_device(); |
| 685 | if (!inputdev) | 1063 | if (!inputdev) |
| @@ -690,24 +1068,28 @@ static int ideapad_input_init(struct ideapad_private *priv) · 4 unmodified lines | |||
| 690 | inputdev->id.bustype = BUS_HOST; | 1068 | inputdev->id.bustype = BUS_HOST; |
| 691 | inputdev->dev.parent = &priv->platform_device->dev; | 1069 | inputdev->dev.parent = &priv->platform_device->dev; |
| 692 | 1070 | ||
| 693 | error = sparse_keymap_setup(inputdev, ideapad_keymap, NULL); | 1071 | err = sparse_keymap_setup(inputdev, ideapad_keymap, NULL); |
| 694 | if (error) { | 1072 | if (err) { |
| 695 | pr_err("Unable to setup input device keymap\n"); | 1073 | dev_err(&priv->platform_device->dev, |
| 1074 | "Could not set up input device keymap: %d\n", err); | ||
| 696 | goto err_free_dev; | 1075 | goto err_free_dev; |
| 697 | } | 1076 | } |
| 698 | 1077 | ||
| 699 | error = input_register_device(inputdev); | 1078 | err = input_register_device(inputdev); |
| 700 | if (error) { | 1079 | if (err) { |
| 701 | pr_err("Unable to register input device\n"); | 1080 | dev_err(&priv->platform_device->dev, |
| 1081 | "Could not register input device: %d\n", err); | ||
| 702 | goto err_free_dev; | 1082 | goto err_free_dev; |
| 703 | } | 1083 | } |
| 704 | 1084 | ||
| 705 | priv->inputdev = inputdev; | 1085 | priv->inputdev = inputdev; |
| 1086 | |||
| 706 | return 0; | 1087 | return 0; |
| 707 | 1088 | ||
| 708 | err_free_dev: | 1089 | err_free_dev: |
| 709 | input_free_device(inputdev); | 1090 | input_free_device(inputdev); |
| 710 | return error; | 1091 | |
| 1092 | return err; | ||
| 711 | } | 1093 | } |
| 712 | 1094 | ||
| 713 | static void ideapad_input_exit(struct ideapad_private *priv) | 1095 | static void ideapad_input_exit(struct ideapad_private *priv) |
| @@ -728,6 +1110,7 @@ static void ideapad_input_novokey(struct ideapad_private *priv) · 14 unmodified lines | |||
| 728 | 1110 | ||
| 729 | if (read_ec_data(priv->adev->handle, VPCCMD_R_NOVO, &long_pressed)) | 1111 | if (read_ec_data(priv->adev->handle, VPCCMD_R_NOVO, &long_pressed)) |
| 730 | return; | 1112 | return; |
| 1113 | |||
| 731 | if (long_pressed) | 1114 | if (long_pressed) |
| 732 | ideapad_input_report(priv, 17); | 1115 | ideapad_input_report(priv, 17); |
| 733 | else | 1116 | else |
| @@ -738,24 +1121,24 @@ static void ideapad_check_special_buttons(struct ideapad_private *priv) · 4 unmodified lines | |||
| 738 | { | 1121 | { |
| 739 | unsigned long bit, value; | 1122 | unsigned long bit, value; |
| 740 | 1123 | ||
| 741 | read_ec_data(priv->adev->handle, VPCCMD_R_SPECIAL_BUTTONS, &value); | 1124 | if (read_ec_data(priv->adev->handle, VPCCMD_R_SPECIAL_BUTTONS, &value)) |
| 742 | 1125 | return; | |
| 743 | for (bit = 0; bit < 16; bit++) { | 1126 | |
| 744 | if (test_bit(bit, &value)) { | 1127 | for_each_set_bit (bit, &value, 16) { |
| 745 | switch (bit) { | 1128 | switch (bit) { |
| 746 | case 0: /* Z580 */ | 1129 | case 6: /* Z570 */ |
| 747 | case 6: /* Z570 */ | 1130 | case 0: /* Z580 */ |
| 748 | /* Thermal Management button */ | 1131 | /* Thermal Management button */ |
| 749 | ideapad_input_report(priv, 65); | 1132 | ideapad_input_report(priv, 65); |
| 750 | break; | 1133 | break; |
| 751 | case 1: | 1134 | case 1: |
| 752 | /* OneKey Theater button */ | 1135 | /* OneKey Theater button */ |
| 753 | ideapad_input_report(priv, 64); | 1136 | ideapad_input_report(priv, 64); |
| 754 | break; | 1137 | break; |
| 755 | default: | 1138 | default: |
| 756 | pr_info("Unknown special button: %lu\n", bit); | 1139 | dev_info(&priv->platform_device->dev, |
| 757 | break; | 1140 | "Unknown special button: %lu\n", bit); |
| 758 | } | 1141 | break; |
| 759 | } | 1142 | } |
| 760 | } | 1143 | } |
| 761 | } | 1144 | } |
| @@ -767,28 +1150,29 @@ static int ideapad_backlight_get_brightness(struct backlight_device *blightdev) · 5 unmodified lines | |||
| 767 | { | 1150 | { |
| 768 | struct ideapad_private *priv = bl_get_data(blightdev); | 1151 | struct ideapad_private *priv = bl_get_data(blightdev); |
| 769 | unsigned long now; | 1152 | unsigned long now; |
| 1153 | int err; | ||
| 770 | 1154 | ||
| 771 | if (!priv) | 1155 | err = read_ec_data(priv->adev->handle, VPCCMD_R_BL, &now); |
| 772 | return -EINVAL; | 1156 | if (err) |
| 1157 | return err; | ||
| 773 | 1158 | ||
| 774 | if (read_ec_data(priv->adev->handle, VPCCMD_R_BL, &now)) | ||
| 775 | return -EIO; | ||
| 776 | return now; | 1159 | return now; |
| 777 | } | 1160 | } |
| 778 | 1161 | ||
| 779 | static int ideapad_backlight_update_status(struct backlight_device *blightdev) | 1162 | static int ideapad_backlight_update_status(struct backlight_device *blightdev) |
| 780 | { | 1163 | { |
| 781 | struct ideapad_private *priv = bl_get_data(blightdev); | 1164 | struct ideapad_private *priv = bl_get_data(blightdev); |
| 1165 | int err; | ||
| 782 | 1166 | ||
| 783 | if (!priv) | 1167 | err = write_ec_cmd(priv->adev->handle, VPCCMD_W_BL, |
| 784 | return -EINVAL; | 1168 | blightdev->props.brightness); |
| 1169 | if (err) | ||
| 1170 | return err; | ||
| 785 | 1171 | ||
| 786 | if (write_ec_cmd(priv->adev->handle, VPCCMD_W_BL, | 1172 | err = write_ec_cmd(priv->adev->handle, VPCCMD_W_BL_POWER, |
| 787 | blightdev->props.brightness)) | 1173 | blightdev->props.power != FB_BLANK_POWERDOWN); |
| 788 | return -EIO; | 1174 | if (err) |
| 789 | if (write_ec_cmd(priv->adev->handle, VPCCMD_W_BL_POWER, | 1175 | return err; |
| 790 | blightdev->props.power == FB_BLANK_POWERDOWN ? 0 : 1)) | ||
| 791 | return -EIO; | ||
| 792 | 1176 | ||
| 793 | return 0; | 1177 | return 0; |
| 794 | } | 1178 | } |
| @@ -803,30 +1187,41 @@ static int ideapad_backlight_init(struct ideapad_private *priv) · 8 unmodified lines | |||
| 803 | struct backlight_device *blightdev; | 1187 | struct backlight_device *blightdev; |
| 804 | struct backlight_properties props; | 1188 | struct backlight_properties props; |
| 805 | unsigned long max, now, power; | 1189 | unsigned long max, now, power; |
| 1190 | int err; | ||
| 806 | 1191 | ||
| 807 | if (read_ec_data(priv->adev->handle, VPCCMD_R_BL_MAX, &max)) | 1192 | err = read_ec_data(priv->adev->handle, VPCCMD_R_BL_MAX, &max); |
| 808 | return -EIO; | 1193 | if (err) |
| 809 | if (read_ec_data(priv->adev->handle, VPCCMD_R_BL, &now)) | 1194 | return err; |
| 810 | return -EIO; | 1195 | |
| 811 | if (read_ec_data(priv->adev->handle, VPCCMD_R_BL_POWER, &power)) | 1196 | err = read_ec_data(priv->adev->handle, VPCCMD_R_BL, &now); |
| 812 | return -EIO; | 1197 | if (err) |
| 1198 | return err; | ||
| 1199 | |||
| 1200 | err = read_ec_data(priv->adev->handle, VPCCMD_R_BL_POWER, &power); | ||
| 1201 | if (err) | ||
| 1202 | return err; | ||
| 1203 | |||
| 1204 | memset(&props, 0, sizeof(props)); | ||
| 813 | 1205 | ||
| 814 | memset(&props, 0, sizeof(struct backlight_properties)); | ||
| 815 | props.max_brightness = max; | 1206 | props.max_brightness = max; |
| 816 | props.type = BACKLIGHT_PLATFORM; | 1207 | props.type = BACKLIGHT_PLATFORM; |
| 1208 | |||
| 817 | blightdev = backlight_device_register("ideapad", | 1209 | blightdev = backlight_device_register("ideapad", |
| 818 | &priv->platform_device->dev, | 1210 | &priv->platform_device->dev, |
| 819 | priv, | 1211 | priv, |
| 820 | &ideapad_backlight_ops, | 1212 | &ideapad_backlight_ops, |
| 821 | &props); | 1213 | &props); |
| 822 | if (IS_ERR(blightdev)) { | 1214 | if (IS_ERR(blightdev)) { |
| 823 | pr_err("Could not register backlight device\n"); | 1215 | err = PTR_ERR(blightdev); |
| 824 | return PTR_ERR(blightdev); | 1216 | dev_err(&priv->platform_device->dev, |
| 1217 | "Could not register backlight device: %d\n", err); | ||
| 1218 | return err; | ||
| 825 | } | 1219 | } |
| 826 | 1220 | ||
| 827 | priv->blightdev = blightdev; | 1221 | priv->blightdev = blightdev; |
| 828 | blightdev->props.brightness = now; | 1222 | blightdev->props.brightness = now; |
| 829 | blightdev->props.power = power ? FB_BLANK_UNBLANK : FB_BLANK_POWERDOWN; | 1223 | blightdev->props.power = power ? FB_BLANK_UNBLANK : FB_BLANK_POWERDOWN; |
| 1224 | |||
| 830 | backlight_update_status(blightdev); | 1225 | backlight_update_status(blightdev); |
| 831 | 1226 | ||
| 832 | return 0; | 1227 | return 0; |
| @@ -840,13 +1235,15 @@ static void ideapad_backlight_exit(struct ideapad_private *priv) · 7 unmodified lines | |||
| 840 | 1235 | ||
| 841 | static void ideapad_backlight_notify_power(struct ideapad_private *priv) | 1236 | static void ideapad_backlight_notify_power(struct ideapad_private *priv) |
| 842 | { | 1237 | { |
| 843 | unsigned long power; | ||
| 844 | struct backlight_device *blightdev = priv->blightdev; | 1238 | struct backlight_device *blightdev = priv->blightdev; |
| 1239 | unsigned long power; | ||
| 845 | 1240 | ||
| 846 | if (!blightdev) | 1241 | if (!blightdev) |
| 847 | return; | 1242 | return; |
| 1243 | |||
| 848 | if (read_ec_data(priv->adev->handle, VPCCMD_R_BL_POWER, &power)) | 1244 | if (read_ec_data(priv->adev->handle, VPCCMD_R_BL_POWER, &power)) |
| 849 | return; | 1245 | return; |
| 1246 | |||
| 850 | blightdev->props.power = power ? FB_BLANK_UNBLANK : FB_BLANK_POWERDOWN; | 1247 | blightdev->props.power = power ? FB_BLANK_UNBLANK : FB_BLANK_POWERDOWN; |
| 851 | } | 1248 | } |
| 852 | 1249 | ||
| @@ -855,12 +1252,112 @@ static void ideapad_backlight_notify_brightness(struct ideapad_private *priv) · 2 unmodified lines | |||
| 855 | unsigned long now; | 1252 | unsigned long now; |
| 856 | 1253 | ||
| 857 | /* if we control brightness via acpi video driver */ | 1254 | /* if we control brightness via acpi video driver */ |
| 858 | if (priv->blightdev == NULL) { | 1255 | if (!priv->blightdev) |
| 859 | read_ec_data(priv->adev->handle, VPCCMD_R_BL, &now); | 1256 | read_ec_data(priv->adev->handle, VPCCMD_R_BL, &now); |
| 1257 | else | ||
| 1258 | backlight_force_update(priv->blightdev, BACKLIGHT_UPDATE_HOTKEY); | ||
| 1259 | } | ||
| 1260 | |||
| 1261 | /* | ||
| 1262 | * keyboard backlight | ||
| 1263 | */ | ||
| 1264 | static int ideapad_kbd_bl_brightness_get(struct ideapad_private *priv) | ||
| 1265 | { | ||
| 1266 | unsigned long hals; | ||
| 1267 | int err; | ||
| 1268 | |||
| 1269 | err = eval_hals(priv->adev->handle, &hals); | ||
| 1270 | if (err) | ||
| 1271 | return err; | ||
| 1272 | |||
| 1273 | return !!test_bit(HALS_KBD_BL_STATE_BIT, &hals); | ||
| 1274 | } | ||
| 1275 | |||
| 1276 | static enum led_brightness ideapad_kbd_bl_led_cdev_brightness_get(struct led_classdev *led_cdev) | ||
| 1277 | { | ||
| 1278 | struct ideapad_private *priv = container_of(led_cdev, struct ideapad_private, kbd_bl.led); | ||
| 1279 | |||
| 1280 | return ideapad_kbd_bl_brightness_get(priv); | ||
| 1281 | } | ||
| 1282 | |||
| 1283 | static int ideapad_kbd_bl_brightness_set(struct ideapad_private *priv, unsigned int brightness) | ||
| 1284 | { | ||
| 1285 | int err = exec_sals(priv->adev->handle, brightness ? SALS_KBD_BL_ON : SALS_KBD_BL_OFF); | ||
| 1286 | |||
| 1287 | if (err) | ||
| 1288 | return err; | ||
| 1289 | |||
| 1290 | priv->kbd_bl.last_brightness = brightness; | ||
| 1291 | |||
| 1292 | return 0; | ||
| 1293 | } | ||
| 1294 | |||
| 1295 | static int ideapad_kbd_bl_led_cdev_brightness_set(struct led_classdev *led_cdev, | ||
| 1296 | enum led_brightness brightness) | ||
| 1297 | { | ||
| 1298 | struct ideapad_private *priv = container_of(led_cdev, struct ideapad_private, kbd_bl.led); | ||
| 1299 | |||
| 1300 | return ideapad_kbd_bl_brightness_set(priv, brightness); | ||
| 1301 | } | ||
| 1302 | |||
| 1303 | static void ideapad_kbd_bl_notify(struct ideapad_private *priv) | ||
| 1304 | { | ||
| 1305 | int brightness; | ||
| 1306 | |||
| 1307 | if (!priv->kbd_bl.initialized) | ||
| 860 | return; | 1308 | return; |
| 861 | } | ||
| 862 | 1309 | ||
| 863 | backlight_force_update(priv->blightdev, BACKLIGHT_UPDATE_HOTKEY); | 1310 | brightness = ideapad_kbd_bl_brightness_get(priv); |
| 1311 | if (brightness < 0) | ||
| 1312 | return; | ||
| 1313 | |||
| 1314 | if (brightness == priv->kbd_bl.last_brightness) | ||
| 1315 | return; | ||
| 1316 | |||
| 1317 | priv->kbd_bl.last_brightness = brightness; | ||
| 1318 | |||
| 1319 | led_classdev_notify_brightness_hw_changed(&priv->kbd_bl.led, brightness); | ||
| 1320 | } | ||
| 1321 | |||
| 1322 | static int ideapad_kbd_bl_init(struct ideapad_private *priv) | ||
| 1323 | { | ||
| 1324 | int brightness, err; | ||
| 1325 | |||
| 1326 | if (!priv->features.kbd_bl) | ||
| 1327 | return -ENODEV; | ||
| 1328 | |||
| 1329 | if (WARN_ON(priv->kbd_bl.initialized)) | ||
| 1330 | return -EEXIST; | ||
| 1331 | |||
| 1332 | brightness = ideapad_kbd_bl_brightness_get(priv); | ||
| 1333 | if (brightness < 0) | ||
| 1334 | return brightness; | ||
| 1335 | |||
| 1336 | priv->kbd_bl.last_brightness = brightness; | ||
| 1337 | |||
| 1338 | priv->kbd_bl.led.name = "platform::" LED_FUNCTION_KBD_BACKLIGHT; | ||
| 1339 | priv->kbd_bl.led.max_brightness = 1; | ||
| 1340 | priv->kbd_bl.led.brightness_get = ideapad_kbd_bl_led_cdev_brightness_get; | ||
| 1341 | priv->kbd_bl.led.brightness_set_blocking = ideapad_kbd_bl_led_cdev_brightness_set; | ||
| 1342 | priv->kbd_bl.led.flags = LED_BRIGHT_HW_CHANGED; | ||
| 1343 | |||
| 1344 | err = led_classdev_register(&priv->platform_device->dev, &priv->kbd_bl.led); | ||
| 1345 | if (err) | ||
| 1346 | return err; | ||
| 1347 | |||
| 1348 | priv->kbd_bl.initialized = true; | ||
| 1349 | |||
| 1350 | return 0; | ||
| 1351 | } | ||
| 1352 | |||
| 1353 | static void ideapad_kbd_bl_exit(struct ideapad_private *priv) | ||
| 1354 | { | ||
| 1355 | if (!priv->kbd_bl.initialized) | ||
| 1356 | return; | ||
| 1357 | |||
| 1358 | priv->kbd_bl.initialized = false; | ||
| 1359 | |||
| 1360 | led_classdev_unregister(&priv->kbd_bl.led); | ||
| 864 | } | 1361 | } |
| 865 | 1362 | ||
| 866 | /* | 1363 | /* |
| @@ -870,71 +1367,77 @@ static void ideapad_sync_touchpad_state(struct ideapad_private *priv) · 3 unmodified lines | |||
| 870 | { | 1367 | { |
| 871 | unsigned long value; | 1368 | unsigned long value; |
| 872 | 1369 | ||
| 873 | if (!priv->has_touchpad_switch) | 1370 | if (!priv->features.touchpad_ctrl_via_ec) |
| 874 | return; | 1371 | return; |
| 875 | 1372 | ||
| 876 | /* Without reading from EC touchpad LED doesn't switch state */ | 1373 | /* Without reading from EC touchpad LED doesn't switch state */ |
| 877 | if (!read_ec_data(priv->adev->handle, VPCCMD_R_TOUCHPAD, &value)) { | 1374 | if (!read_ec_data(priv->adev->handle, VPCCMD_R_TOUCHPAD, &value)) { |
| 878 | /* Some IdeaPads don't really turn off touchpad - they only | 1375 | unsigned char param; |
| 1376 | /* | ||
| 1377 | * Some IdeaPads don't really turn off touchpad - they only | ||
| 879 | * switch the LED state. We (de)activate KBC AUX port to turn | 1378 | * switch the LED state. We (de)activate KBC AUX port to turn |
| 880 | * touchpad off and on. We send KEY_TOUCHPAD_OFF and | 1379 | * touchpad off and on. We send KEY_TOUCHPAD_OFF and |
| 881 | * KEY_TOUCHPAD_ON to not to get out of sync with LED */ | 1380 | * KEY_TOUCHPAD_ON to not to get out of sync with LED |
| 882 | unsigned char param; | 1381 | */ |
| 883 | i8042_command(¶m, value ? I8042_CMD_AUX_ENABLE : | 1382 | i8042_command(¶m, value ? I8042_CMD_AUX_ENABLE : I8042_CMD_AUX_DISABLE); |
| 884 | I8042_CMD_AUX_DISABLE); | ||
| 885 | ideapad_input_report(priv, value ? 67 : 66); | 1383 | ideapad_input_report(priv, value ? 67 : 66); |
| 1384 | sysfs_notify(&priv->platform_device->dev.kobj, NULL, "touchpad"); | ||
| 886 | } | 1385 | } |
| 887 | } | 1386 | } |
| 888 | 1387 | ||
| 889 | static void ideapad_acpi_notify(acpi_handle handle, u32 event, void *data) | 1388 | static void ideapad_acpi_notify(acpi_handle handle, u32 event, void *data) |
| 890 | { | 1389 | { |
| 891 | struct ideapad_private *priv = data; | 1390 | struct ideapad_private *priv = data; |
| 892 | unsigned long vpc1, vpc2, vpc_bit; | 1391 | unsigned long vpc1, vpc2, bit; |
| 893 | 1392 | ||
| 894 | if (read_ec_data(handle, VPCCMD_R_VPC1, &vpc1)) | 1393 | if (read_ec_data(handle, VPCCMD_R_VPC1, &vpc1)) |
| 895 | return; | 1394 | return; |
| 1395 | |||
| 896 | if (read_ec_data(handle, VPCCMD_R_VPC2, &vpc2)) | 1396 | if (read_ec_data(handle, VPCCMD_R_VPC2, &vpc2)) |
| 897 | return; | 1397 | return; |
| 898 | 1398 | ||
| 899 | vpc1 = (vpc2 << 8) | vpc1; | 1399 | vpc1 = (vpc2 << 8) | vpc1; |
| 900 | for (vpc_bit = 0; vpc_bit < 16; vpc_bit++) { | 1400 | |
| 901 | if (test_bit(vpc_bit, &vpc1)) { | 1401 | for_each_set_bit (bit, &vpc1, 16) { |
| 902 | switch (vpc_bit) { | 1402 | switch (bit) { |
| 903 | case 9: | 1403 | case 13: |
| 904 | ideapad_sync_rfk_state(priv); | 1404 | case 11: |
| 905 | break; | 1405 | case 8: |
| 906 | case 13: | 1406 | case 7: |
| 907 | case 11: | 1407 | case 6: |
| 908 | case 8: | 1408 | ideapad_input_report(priv, bit); |
| 909 | case 7: | 1409 | break; |
| 910 | case 6: | 1410 | case 9: |
| 911 | ideapad_input_report(priv, vpc_bit); | 1411 | ideapad_sync_rfk_state(priv); |
| 912 | break; | 1412 | break; |
| 913 | case 5: | 1413 | case 5: |
| 914 | ideapad_sync_touchpad_state(priv); | 1414 | ideapad_sync_touchpad_state(priv); |
| 915 | break; | 1415 | break; |
| 916 | case 4: | 1416 | case 4: |
| 917 | ideapad_backlight_notify_brightness(priv); | 1417 | ideapad_backlight_notify_brightness(priv); |
| 918 | break; | 1418 | break; |
| 919 | case 3: | 1419 | case 3: |
| 920 | ideapad_input_novokey(priv); | 1420 | ideapad_input_novokey(priv); |
| 921 | break; | 1421 | break; |
| 922 | case 2: | 1422 | case 2: |
| 923 | ideapad_backlight_notify_power(priv); | 1423 | ideapad_backlight_notify_power(priv); |
| 924 | break; | 1424 | break; |
| 925 | case 0: | 1425 | case 1: |
| 926 | ideapad_check_special_buttons(priv); | 1426 | /* |
| 927 | break; | 1427 | * Some IdeaPads report event 1 every ~20 |
| 928 | case 1: | 1428 | * seconds while on battery power; some |
| 929 | /* Some IdeaPads report event 1 every ~20 | 1429 | * report this when changing to/from tablet |
| 930 | * seconds while on battery power; some | 1430 | * mode; some report this when the keyboard |
| 931 | * report this when changing to/from tablet | 1431 | * backlight has changed. |
| 932 | * mode. Squelch this event. | 1432 | */ |
| 933 | */ | 1433 | ideapad_kbd_bl_notify(priv); |
| 934 | break; | 1434 | break; |
| 935 | default: | 1435 | case 0: |
| 936 | pr_info("Unknown event: %lu\n", vpc_bit); | 1436 | ideapad_check_special_buttons(priv); |
| 937 | } | 1437 | break; |
| 1438 | default: | ||
| 1439 | dev_info(&priv->platform_device->dev, | ||
| 1440 | "Unknown event: %lu\n", bit); | ||
| 938 | } | 1441 | } |
| 939 | } | 1442 | } |
| 940 | } | 1443 | } |
| @@ -942,12 +1445,15 @@ static void ideapad_acpi_notify(acpi_handle handle, u32 event, void *data) · 1 unmodified line | |||
| 942 | #if IS_ENABLED(CONFIG_ACPI_WMI) | 1445 | #if IS_ENABLED(CONFIG_ACPI_WMI) |
| 943 | static void ideapad_wmi_notify(u32 value, void *context) | 1446 | static void ideapad_wmi_notify(u32 value, void *context) |
| 944 | { | 1447 | { |
| 1448 | struct ideapad_private *priv = context; | ||
| 1449 | |||
| 945 | switch (value) { | 1450 | switch (value) { |
| 946 | case 128: | 1451 | case 128: |
| 947 | ideapad_input_report(context, value); | 1452 | ideapad_input_report(priv, value); |
| 948 | break; | 1453 | break; |
| 949 | default: | 1454 | default: |
| 950 | pr_info("Unknown WMI event %u\n", value); | 1455 | dev_info(&priv->platform_device->dev, |
| 1456 | "Unknown WMI event: %u\n", value); | ||
| 951 | } | 1457 | } |
| 952 | } | 1458 | } |
| 953 | #endif | 1459 | #endif |
| @@ -971,18 +1477,52 @@ static const struct dmi_system_id hw_rfkill_list[] = { · 17 unmodified lines | |||
| 971 | {} | 1477 | {} |
| 972 | }; | 1478 | }; |
| 973 | 1479 | ||
| 1480 | static void ideapad_check_features(struct ideapad_private *priv) | ||
| 1481 | { | ||
| 1482 | acpi_handle handle = priv->adev->handle; | ||
| 1483 | unsigned long val; | ||
| 1484 | |||
| 1485 | priv->features.hw_rfkill_switch = dmi_check_system(hw_rfkill_list); | ||
| 1486 | |||
| 1487 | /* Most ideapads with ELAN0634 touchpad don't use EC touchpad switch */ | ||
| 1488 | priv->features.touchpad_ctrl_via_ec = !acpi_dev_present("ELAN0634", NULL, -1); | ||
| 1489 | |||
| 1490 | if (!read_ec_data(handle, VPCCMD_R_FAN, &val)) | ||
| 1491 | priv->features.fan_mode = true; | ||
| 1492 | |||
| 1493 | if (acpi_has_method(handle, "GBMD") && acpi_has_method(handle, "SBMC")) | ||
| 1494 | priv->features.conservation_mode = true; | ||
| 1495 | |||
| 1496 | if (acpi_has_method(handle, "DYTC")) | ||
| 1497 | priv->features.dytc = true; | ||
| 1498 | |||
| 1499 | if (acpi_has_method(handle, "HALS") && acpi_has_method(handle, "SALS")) { | ||
| 1500 | if (!eval_hals(handle, &val)) { | ||
| 1501 | if (test_bit(HALS_FNLOCK_SUPPORT_BIT, &val)) | ||
| 1502 | priv->features.fn_lock = true; | ||
| 1503 | |||
| 1504 | if (test_bit(HALS_KBD_BL_SUPPORT_BIT, &val)) | ||
| 1505 | priv->features.kbd_bl = true; | ||
| 1506 | |||
| 1507 | if (test_bit(HALS_USB_CHARGING_SUPPORT_BIT, &val)) | ||
| 1508 | priv->features.usb_charging = true; | ||
| 1509 | } | ||
| 1510 | } | ||
| 1511 | } | ||
| 1512 | |||
| 974 | static int ideapad_acpi_add(struct platform_device *pdev) | 1513 | static int ideapad_acpi_add(struct platform_device *pdev) |
| 975 | { | 1514 | { |
| 976 | int ret, i; | ||
| 977 | int cfg; | ||
| 978 | struct ideapad_private *priv; | 1515 | struct ideapad_private *priv; |
| 979 | struct acpi_device *adev; | 1516 | struct acpi_device *adev; |
| 1517 | acpi_status status; | ||
| 1518 | unsigned long cfg; | ||
| 1519 | int err, i; | ||
| 980 | 1520 | ||
| 981 | ret = acpi_bus_get_device(ACPI_HANDLE(&pdev->dev), &adev); | 1521 | err = acpi_bus_get_device(ACPI_HANDLE(&pdev->dev), &adev); |
| 982 | if (ret) | 1522 | if (err) |
| 983 | return -ENODEV; | 1523 | return -ENODEV; |
| 984 | 1524 | ||
| 985 | if (read_method_int(adev->handle, "_CFG", &cfg)) | 1525 | if (eval_int(adev->handle, "_CFG", &cfg)) |
| 986 | return -ENODEV; | 1526 | return -ENODEV; |
| 987 | 1527 | ||
| 988 | priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL); | 1528 | priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL); |
| @@ -990,33 +1530,40 @@ static int ideapad_acpi_add(struct platform_device *pdev) · 1 unmodified line | |||
| 990 | return -ENOMEM; | 1530 | return -ENOMEM; |
| 991 | 1531 | ||
| 992 | dev_set_drvdata(&pdev->dev, priv); | 1532 | dev_set_drvdata(&pdev->dev, priv); |
| 1533 | |||
| 993 | priv->cfg = cfg; | 1534 | priv->cfg = cfg; |
| 994 | priv->adev = adev; | 1535 | priv->adev = adev; |
| 995 | priv->platform_device = pdev; | 1536 | priv->platform_device = pdev; |
| 996 | priv->has_hw_rfkill_switch = dmi_check_system(hw_rfkill_list); | ||
| 997 | 1537 | ||
| 998 | /* Most ideapads with ELAN0634 touchpad don't use EC touchpad switch */ | 1538 | ideapad_check_features(priv); |
| 999 | priv->has_touchpad_switch = !acpi_dev_present("ELAN0634", NULL, -1); | ||
| 1000 | 1539 | ||
| 1001 | ret = ideapad_sysfs_init(priv); | 1540 | err = ideapad_sysfs_init(priv); |
| 1002 | if (ret) | 1541 | if (err) |
| 1003 | return ret; | 1542 | return err; |
| 1004 | 1543 | ||
| 1005 | ideapad_debugfs_init(priv); | 1544 | ideapad_debugfs_init(priv); |
| 1006 | 1545 | ||
| 1007 | ret = ideapad_input_init(priv); | 1546 | err = ideapad_input_init(priv); |
| 1008 | if (ret) | 1547 | if (err) |
| 1009 | goto input_failed; | 1548 | goto input_failed; |
| 1010 | 1549 | ||
| 1550 | err = ideapad_kbd_bl_init(priv); | ||
| 1551 | if (err) { | ||
| 1552 | if (err != -ENODEV) | ||
| 1553 | dev_warn(&pdev->dev, "Could not set up keyboard backlight LED: %d\n", err); | ||
| 1554 | else | ||
| 1555 | dev_info(&pdev->dev, "Keyboard backlight control not available\n"); | ||
| 1556 | } | ||
| 1557 | |||
| 1011 | /* | 1558 | /* |
| 1012 | * On some models without a hw-switch (the yoga 2 13 at least) | 1559 | * On some models without a hw-switch (the yoga 2 13 at least) |
| 1013 | * VPCCMD_W_RF must be explicitly set to 1 for the wifi to work. | 1560 | * VPCCMD_W_RF must be explicitly set to 1 for the wifi to work. |
| 1014 | */ | 1561 | */ |
| 1015 | if (!priv->has_hw_rfkill_switch) | 1562 | if (!priv->features.hw_rfkill_switch) |
| 1016 | write_ec_cmd(priv->adev->handle, VPCCMD_W_RF, 1); | 1563 | write_ec_cmd(priv->adev->handle, VPCCMD_W_RF, 1); |
| 1017 | 1564 | ||
| 1018 | /* The same for Touchpad */ | 1565 | /* The same for Touchpad */ |
| 1019 | if (!priv->has_touchpad_switch) | 1566 | if (!priv->features.touchpad_ctrl_via_ec) |
| 1020 | write_ec_cmd(priv->adev->handle, VPCCMD_W_TOUCHPAD, 1); | 1567 | write_ec_cmd(priv->adev->handle, VPCCMD_W_TOUCHPAD, 1); |
| 1021 | 1568 | ||
| 1022 | for (i = 0; i < IDEAPAD_RFKILL_DEV_NUM; i++) | 1569 | for (i = 0; i < IDEAPAD_RFKILL_DEV_NUM; i++) |
| @@ -1026,45 +1573,70 @@ static int ideapad_acpi_add(struct platform_device *pdev) · 3 unmodified lines | |||
| 1026 | ideapad_sync_rfk_state(priv); | 1573 | ideapad_sync_rfk_state(priv); |
| 1027 | ideapad_sync_touchpad_state(priv); | 1574 | ideapad_sync_touchpad_state(priv); |
| 1028 | 1575 | ||
| 1576 | err = ideapad_dytc_profile_init(priv); | ||
| 1577 | if (err) { | ||
| 1578 | if (err != -ENODEV) | ||
| 1579 | dev_warn(&pdev->dev, "Could not set up DYTC interface: %d\n", err); | ||
| 1580 | else | ||
| 1581 | dev_info(&pdev->dev, "DYTC interface is not available\n"); | ||
| 1582 | } | ||
| 1583 | |||
| 1029 | if (acpi_video_get_backlight_type() == acpi_backlight_vendor) { | 1584 | if (acpi_video_get_backlight_type() == acpi_backlight_vendor) { |
| 1030 | ret = ideapad_backlight_init(priv); | 1585 | err = ideapad_backlight_init(priv); |
| 1031 | if (ret && ret != -ENODEV) | 1586 | if (err && err != -ENODEV) |
| 1032 | goto backlight_failed; | 1587 | goto backlight_failed; |
| 1033 | } | 1588 | } |
| 1034 | ret = acpi_install_notify_handler(adev->handle, | 1589 | |
| 1035 | ACPI_DEVICE_NOTIFY, ideapad_acpi_notify, priv); | 1590 | status = acpi_install_notify_handler(adev->handle, |
| 1036 | if (ret) | 1591 | ACPI_DEVICE_NOTIFY, |
| 1592 | ideapad_acpi_notify, priv); | ||
| 1593 | if (ACPI_FAILURE(status)) { | ||
| 1594 | err = -EIO; | ||
| 1037 | goto notification_failed; | 1595 | goto notification_failed; |
| 1596 | } | ||
| 1038 | 1597 | ||
| 1039 | #if IS_ENABLED(CONFIG_ACPI_WMI) | 1598 | #if IS_ENABLED(CONFIG_ACPI_WMI) |
| 1040 | for (i = 0; i < ARRAY_SIZE(ideapad_wmi_fnesc_events); i++) { | 1599 | for (i = 0; i < ARRAY_SIZE(ideapad_wmi_fnesc_events); i++) { |
| 1041 | ret = wmi_install_notify_handler(ideapad_wmi_fnesc_events[i], | 1600 | status = wmi_install_notify_handler(ideapad_wmi_fnesc_events[i], |
| 1042 | ideapad_wmi_notify, priv); | 1601 | ideapad_wmi_notify, priv); |
| 1043 | if (ret == AE_OK) { | 1602 | if (ACPI_SUCCESS(status)) { |
| 1044 | priv->fnesc_guid = ideapad_wmi_fnesc_events[i]; | 1603 | priv->fnesc_guid = ideapad_wmi_fnesc_events[i]; |
| 1045 | break; | 1604 | break; |
| 1046 | } | 1605 | } |
| 1047 | } | 1606 | } |
| 1048 | if (ret != AE_OK && ret != AE_NOT_EXIST) | 1607 | |
| 1608 | if (ACPI_FAILURE(status) && status != AE_NOT_EXIST) { | ||
| 1609 | err = -EIO; | ||
| 1049 | goto notification_failed_wmi; | 1610 | goto notification_failed_wmi; |
| 1611 | } | ||
| 1050 | #endif | 1612 | #endif |
| 1051 | 1613 | ||
| 1052 | return 0; | 1614 | return 0; |
| 1615 | |||
| 1053 | #if IS_ENABLED(CONFIG_ACPI_WMI) | 1616 | #if IS_ENABLED(CONFIG_ACPI_WMI) |
| 1054 | notification_failed_wmi: | 1617 | notification_failed_wmi: |
| 1055 | acpi_remove_notify_handler(priv->adev->handle, | 1618 | acpi_remove_notify_handler(priv->adev->handle, |
| 1056 | ACPI_DEVICE_NOTIFY, ideapad_acpi_notify); | 1619 | ACPI_DEVICE_NOTIFY, |
| 1620 | ideapad_acpi_notify); | ||
| 1057 | #endif | 1621 | #endif |
| 1622 | |||
| 1058 | notification_failed: | 1623 | notification_failed: |
| 1059 | ideapad_backlight_exit(priv); | 1624 | ideapad_backlight_exit(priv); |
| 1625 | |||
| 1060 | backlight_failed: | 1626 | backlight_failed: |
| 1627 | ideapad_dytc_profile_exit(priv); | ||
| 1628 | |||
| 1061 | for (i = 0; i < IDEAPAD_RFKILL_DEV_NUM; i++) | 1629 | for (i = 0; i < IDEAPAD_RFKILL_DEV_NUM; i++) |
| 1062 | ideapad_unregister_rfkill(priv, i); | 1630 | ideapad_unregister_rfkill(priv, i); |
| 1631 | |||
| 1632 | ideapad_kbd_bl_exit(priv); | ||
| 1063 | ideapad_input_exit(priv); | 1633 | ideapad_input_exit(priv); |
| 1634 | |||
| 1064 | input_failed: | 1635 | input_failed: |
| 1065 | ideapad_debugfs_exit(priv); | 1636 | ideapad_debugfs_exit(priv); |
| 1066 | ideapad_sysfs_exit(priv); | 1637 | ideapad_sysfs_exit(priv); |
| 1067 | return ret; | 1638 | |
| 1639 | return err; | ||
| 1068 | } | 1640 | } |
| 1069 | 1641 | ||
| 1070 | static int ideapad_acpi_remove(struct platform_device *pdev) | 1642 | static int ideapad_acpi_remove(struct platform_device *pdev) |
| @@ -1076,38 +1648,44 @@ static int ideapad_acpi_remove(struct platform_device *pdev) · 5 unmodified lines | |||
| 1076 | if (priv->fnesc_guid) | 1648 | if (priv->fnesc_guid) |
| 1077 | wmi_remove_notify_handler(priv->fnesc_guid); | 1649 | wmi_remove_notify_handler(priv->fnesc_guid); |
| 1078 | #endif | 1650 | #endif |
| 1651 | |||
| 1079 | acpi_remove_notify_handler(priv->adev->handle, | 1652 | acpi_remove_notify_handler(priv->adev->handle, |
| 1080 | ACPI_DEVICE_NOTIFY, ideapad_acpi_notify); | 1653 | ACPI_DEVICE_NOTIFY, |
| 1654 | ideapad_acpi_notify); | ||
| 1655 | |||
| 1081 | ideapad_backlight_exit(priv); | 1656 | ideapad_backlight_exit(priv); |
| 1657 | ideapad_dytc_profile_exit(priv); | ||
| 1658 | |||
| 1082 | for (i = 0; i < IDEAPAD_RFKILL_DEV_NUM; i++) | 1659 | for (i = 0; i < IDEAPAD_RFKILL_DEV_NUM; i++) |
| 1083 | ideapad_unregister_rfkill(priv, i); | 1660 | ideapad_unregister_rfkill(priv, i); |
| 1661 | |||
| 1662 | ideapad_kbd_bl_exit(priv); | ||
| 1084 | ideapad_input_exit(priv); | 1663 | ideapad_input_exit(priv); |
| 1085 | ideapad_debugfs_exit(priv); | 1664 | ideapad_debugfs_exit(priv); |
| 1086 | ideapad_sysfs_exit(priv); | 1665 | ideapad_sysfs_exit(priv); |
| 1087 | dev_set_drvdata(&pdev->dev, NULL); | ||
| 1088 | 1666 | ||
| 1089 | return 0; | 1667 | return 0; |
| 1090 | } | 1668 | } |
| 1091 | 1669 | ||
| 1092 | #ifdef CONFIG_PM_SLEEP | 1670 | #ifdef CONFIG_PM_SLEEP |
| 1093 | static int ideapad_acpi_resume(struct device *device) | 1671 | static int ideapad_acpi_resume(struct device *dev) |
| 1094 | { | 1672 | { |
| 1095 | struct ideapad_private *priv; | 1673 | struct ideapad_private *priv = dev_get_drvdata(dev); |
| 1096 | |||
| 1097 | if (!device) | ||
| 1098 | return -EINVAL; | ||
| 1099 | priv = dev_get_drvdata(device); | ||
| 1100 | 1674 | ||
| 1101 | ideapad_sync_rfk_state(priv); | 1675 | ideapad_sync_rfk_state(priv); |
| 1102 | ideapad_sync_touchpad_state(priv); | 1676 | ideapad_sync_touchpad_state(priv); |
| 1677 | |||
| 1678 | if (priv->dytc) | ||
| 1679 | dytc_profile_refresh(priv); | ||
| 1680 | |||
| 1103 | return 0; | 1681 | return 0; |
| 1104 | } | 1682 | } |
| 1105 | #endif | 1683 | #endif |
| 1106 | static SIMPLE_DEV_PM_OPS(ideapad_pm, NULL, ideapad_acpi_resume); | 1684 | static SIMPLE_DEV_PM_OPS(ideapad_pm, NULL, ideapad_acpi_resume); |
| 1107 | 1685 | ||
| 1108 | static const struct acpi_device_id ideapad_device_ids[] = { | 1686 | static const struct acpi_device_id ideapad_device_ids[] = { |
| 1109 | { "VPC2004", 0}, | 1687 | {"VPC2004", 0}, |
| 1110 | { "", 0}, | 1688 | {"", 0}, |
| 1111 | }; | 1689 | }; |
| 1112 | MODULE_DEVICE_TABLE(acpi, ideapad_device_ids); | 1690 | MODULE_DEVICE_TABLE(acpi, ideapad_device_ids); |
| 1113 | 1691 | ||
| @@ -377,6 +377,7 @@ static const struct x86_cpu_id intel_uncore_cpu_ids[] = { · 376 unmodified lines | |||
| 377 | X86_MATCH_INTEL_FAM6_MODEL(SKYLAKE_X, NULL), | 377 | X86_MATCH_INTEL_FAM6_MODEL(SKYLAKE_X, NULL), |
| 378 | X86_MATCH_INTEL_FAM6_MODEL(ICELAKE_X, NULL), | 378 | X86_MATCH_INTEL_FAM6_MODEL(ICELAKE_X, NULL), |
| 379 | X86_MATCH_INTEL_FAM6_MODEL(ICELAKE_D, NULL), | 379 | X86_MATCH_INTEL_FAM6_MODEL(ICELAKE_D, NULL), |
| 380 | X86_MATCH_INTEL_FAM6_MODEL(SAPPHIRERAPIDS_X, NULL), | ||
| 380 | {} | 381 | {} |
| 381 | }; | 382 | }; |
| 382 | 383 | ||
| @@ -44,6 +44,7 @@ static const struct key_entry intel_vbtn_keymap[] = { · 43 unmodified lines | |||
| 44 | { KE_IGNORE, 0xC7, { KEY_VOLUMEDOWN } }, /* volume-down key release */ | 44 | { KE_IGNORE, 0xC7, { KEY_VOLUMEDOWN } }, /* volume-down key release */ |
| 45 | { KE_KEY, 0xC8, { KEY_ROTATE_LOCK_TOGGLE } }, /* rotate-lock key press */ | 45 | { KE_KEY, 0xC8, { KEY_ROTATE_LOCK_TOGGLE } }, /* rotate-lock key press */ |
| 46 | { KE_KEY, 0xC9, { KEY_ROTATE_LOCK_TOGGLE } }, /* rotate-lock key release */ | 46 | { KE_KEY, 0xC9, { KEY_ROTATE_LOCK_TOGGLE } }, /* rotate-lock key release */ |
| 47 | { KE_END } | ||
| 47 | }; | 48 | }; |
| 48 | 49 | ||
| 49 | static const struct key_entry intel_vbtn_switchmap[] = { | 50 | static const struct key_entry intel_vbtn_switchmap[] = { |
| @@ -51,14 +52,15 @@ static const struct key_entry intel_vbtn_switchmap[] = { · 1 unmodified line | |||
| 51 | { KE_SW, 0xCB, { .sw = { SW_DOCK, 0 } } }, /* Undocked */ | 52 | { KE_SW, 0xCB, { .sw = { SW_DOCK, 0 } } }, /* Undocked */ |
| 52 | { KE_SW, 0xCC, { .sw = { SW_TABLET_MODE, 1 } } }, /* Tablet */ | 53 | { KE_SW, 0xCC, { .sw = { SW_TABLET_MODE, 1 } } }, /* Tablet */ |
| 53 | { KE_SW, 0xCD, { .sw = { SW_TABLET_MODE, 0 } } }, /* Laptop */ | 54 | { KE_SW, 0xCD, { .sw = { SW_TABLET_MODE, 0 } } }, /* Laptop */ |
| 55 | { KE_END } | ||
| 54 | }; | 56 | }; |
| 55 | 57 | ||
| 56 | #define KEYMAP_LEN \ | 58 | #define KEYMAP_LEN \ |
| 57 | (ARRAY_SIZE(intel_vbtn_keymap) + ARRAY_SIZE(intel_vbtn_switchmap) + 1) | 59 | (ARRAY_SIZE(intel_vbtn_keymap) + ARRAY_SIZE(intel_vbtn_switchmap) + 1) |
| 58 | 60 | ||
| 59 | struct intel_vbtn_priv { | 61 | struct intel_vbtn_priv { |
| 60 | struct key_entry keymap[KEYMAP_LEN]; | 62 | struct input_dev *buttons_dev; |
| 61 | struct input_dev *input_dev; | 63 | struct input_dev *switches_dev; |
| 62 | bool has_buttons; | 64 | bool has_buttons; |
| 63 | bool has_switches; | 65 | bool has_switches; |
| 64 | bool wakeup_mode; | 66 | bool wakeup_mode; |
| @@ -77,48 +79,62 @@ static void detect_tablet_mode(struct platform_device *device) · 12 unmodified lines | |||
| 77 | return; | 79 | return; |
| 78 | 80 | ||
| 79 | m = !(vgbs & VGBS_TABLET_MODE_FLAGS); | 81 | m = !(vgbs & VGBS_TABLET_MODE_FLAGS); |
| 80 | input_report_switch(priv->input_dev, SW_TABLET_MODE, m); | 82 | input_report_switch(priv->switches_dev, SW_TABLET_MODE, m); |
| 81 | m = (vgbs & VGBS_DOCK_MODE_FLAG) ? 1 : 0; | 83 | m = (vgbs & VGBS_DOCK_MODE_FLAG) ? 1 : 0; |
| 82 | input_report_switch(priv->input_dev, SW_DOCK, m); | 84 | input_report_switch(priv->switches_dev, SW_DOCK, m); |
| 83 | } | 85 | } |
| 84 | 86 | ||
| 87 | /* | ||
| 88 | * Note this unconditionally creates the 2 input_dev-s and sets up | ||
| 89 | * the sparse-keymaps. Only the registration is conditional on | ||
| 90 | * have_buttons / have_switches. This is done so that the notify | ||
| 91 | * handler can always call sparse_keymap_entry_from_scancode() | ||
| 92 | * on the input_dev-s do determine the event type. | ||
| 93 | */ | ||
| 85 | static int intel_vbtn_input_setup(struct platform_device *device) | 94 | static int intel_vbtn_input_setup(struct platform_device *device) |
| 86 | { | 95 | { |
| 87 | struct intel_vbtn_priv *priv = dev_get_drvdata(&device->dev); | 96 | struct intel_vbtn_priv *priv = dev_get_drvdata(&device->dev); |
| 88 | int ret, keymap_len = 0; | 97 | int ret; |
| 89 | 98 | ||
| 90 | if (priv->has_buttons) { | 99 | priv->buttons_dev = devm_input_allocate_device(&device->dev); |
| 91 | memcpy(&priv->keymap[keymap_len], intel_vbtn_keymap, | 100 | if (!priv->buttons_dev) |
| 92 | ARRAY_SIZE(intel_vbtn_keymap) * | 101 | return -ENOMEM; |
| 93 | sizeof(struct key_entry)); | ||
| 94 | keymap_len += ARRAY_SIZE(intel_vbtn_keymap); | ||
| 95 | } | ||
| 96 | 102 | ||
| 97 | if (priv->has_switches) { | 103 | ret = sparse_keymap_setup(priv->buttons_dev, intel_vbtn_keymap, NULL); |
| 98 | memcpy(&priv->keymap[keymap_len], intel_vbtn_switchmap, | 104 | if (ret) |
| 99 | ARRAY_SIZE(intel_vbtn_switchmap) * | 105 | return ret; |
| 100 | sizeof(struct key_entry)); | ||
| 101 | keymap_len += ARRAY_SIZE(intel_vbtn_switchmap); | ||
| 102 | } | ||
| 103 | 106 | ||
| 104 | priv->keymap[keymap_len].type = KE_END; | 107 | priv->buttons_dev->dev.parent = &device->dev; |
| 108 | priv->buttons_dev->name = "Intel Virtual Buttons"; | ||
| 109 | priv->buttons_dev->id.bustype = BUS_HOST; | ||
| 105 | 110 | ||
| 106 | priv->input_dev = devm_input_allocate_device(&device->dev); | 111 | if (priv->has_buttons) { |
| 107 | if (!priv->input_dev) | 112 | ret = input_register_device(priv->buttons_dev); |
| 113 | if (ret) | ||
| 114 | return ret; | ||
| 115 | } | ||
| 116 | |||
| 117 | priv->switches_dev = devm_input_allocate_device(&device->dev); | ||
| 118 | if (!priv->switches_dev) | ||
| 108 | return -ENOMEM; | 119 | return -ENOMEM; |
| 109 | 120 | ||
| 110 | ret = sparse_keymap_setup(priv->input_dev, priv->keymap, NULL); | 121 | ret = sparse_keymap_setup(priv->switches_dev, intel_vbtn_switchmap, NULL); |
| 111 | if (ret) | 122 | if (ret) |
| 112 | return ret; | 123 | return ret; |
| 113 | 124 | ||
| 114 | priv->input_dev->dev.parent = &device->dev; | 125 | priv->switches_dev->dev.parent = &device->dev; |
| 115 | priv->input_dev->name = "Intel Virtual Button driver"; | 126 | priv->switches_dev->name = "Intel Virtual Switches"; |
| 116 | priv->input_dev->id.bustype = BUS_HOST; | 127 | priv->switches_dev->id.bustype = BUS_HOST; |
| 117 | 128 | ||
| 118 | if (priv->has_switches) | 129 | if (priv->has_switches) { |
| 119 | detect_tablet_mode(device); | 130 | detect_tablet_mode(device); |
| 120 | 131 | ||
| 121 | return input_register_device(priv->input_dev); | 132 | ret = input_register_device(priv->switches_dev); |
| 133 | if (ret) | ||
| 134 | return ret; | ||
| 135 | } | ||
| 136 | |||
| 137 | return 0; | ||
| 122 | } | 138 | } |
| 123 | 139 | ||
| 124 | static void notify_handler(acpi_handle handle, u32 event, void *context) | 140 | static void notify_handler(acpi_handle handle, u32 event, void *context) |
| @@ -127,48 +143,50 @@ static void notify_handler(acpi_handle handle, u32 event, void *context) · 2 unmodified lines | |||
| 127 | struct intel_vbtn_priv *priv = dev_get_drvdata(&device->dev); | 143 | struct intel_vbtn_priv *priv = dev_get_drvdata(&device->dev); |
| 128 | unsigned int val = !(event & 1); /* Even=press, Odd=release */ | 144 | unsigned int val = !(event & 1); /* Even=press, Odd=release */ |
| 129 | const struct key_entry *ke, *ke_rel; | 145 | const struct key_entry *ke, *ke_rel; |
| 146 | struct input_dev *input_dev; | ||
| 130 | bool autorelease; | 147 | bool autorelease; |
| 148 | int ret; | ||
| 131 | 149 | ||
| 132 | if (priv->wakeup_mode) { | 150 | if ((ke = sparse_keymap_entry_from_scancode(priv->buttons_dev, event))) { |
| 133 | ke = sparse_keymap_entry_from_scancode(priv->input_dev, event); | 151 | if (!priv->has_buttons) { |
| 134 | if (ke) { | 152 | dev_warn(&device->dev, "Warning: received a button event on a device without buttons, please report this.\n"); |
| 135 | pm_wakeup_hard_event(&device->dev); | ||
| 136 | |||
| 137 | /* | ||
| 138 | * Switch events like tablet mode will wake the device | ||
| 139 | * and report the new switch position to the input | ||
| 140 | * subsystem. | ||
| 141 | */ | ||
| 142 | if (ke->type == KE_SW) | ||
| 143 | sparse_keymap_report_event(priv->input_dev, | ||
| 144 | event, | ||
| 145 | val, | ||
| 146 | 0); | ||
| 147 | return; | 153 | return; |
| 148 | } | 154 | } |
| 149 | goto out_unknown; | 155 | input_dev = priv->buttons_dev; |
| 156 | } else if ((ke = sparse_keymap_entry_from_scancode(priv->switches_dev, event))) { | ||
| 157 | if (!priv->has_switches) { | ||
| 158 | dev_info(&device->dev, "Registering Intel Virtual Switches input-dev after receiving a switch event\n"); | ||
| 159 | ret = input_register_device(priv->switches_dev); | ||
| 160 | if (ret) | ||
| 161 | return; | ||
| 162 | |||
| 163 | priv->has_switches = true; | ||
| 164 | } | ||
| 165 | input_dev = priv->switches_dev; | ||
| 166 | } else { | ||
| 167 | dev_dbg(&device->dev, "unknown event index 0x%x\n", event); | ||
| 168 | return; | ||
| 169 | } | ||
| 170 | |||
| 171 | if (priv->wakeup_mode) { | ||
| 172 | pm_wakeup_hard_event(&device->dev); | ||
| 173 | |||
| 174 | /* | ||
| 175 | * Skip reporting an evdev event for button wake events, | ||
| 176 | * mirroring how the drivers/acpi/button.c code skips this too. | ||
| 177 | */ | ||
| 178 | if (ke->type == KE_KEY) | ||
| 179 | return; | ||
| 150 | } | 180 | } |
| 151 | 181 | ||
| 152 | /* | 182 | /* |
| 153 | * Even press events are autorelease if there is no corresponding odd | 183 | * Even press events are autorelease if there is no corresponding odd |
| 154 | * release event, or if the odd event is KE_IGNORE. | 184 | * release event, or if the odd event is KE_IGNORE. |
| 155 | */ | 185 | */ |
| 156 | ke_rel = sparse_keymap_entry_from_scancode(priv->input_dev, event | 1); | 186 | ke_rel = sparse_keymap_entry_from_scancode(input_dev, event | 1); |
| 157 | autorelease = val && (!ke_rel || ke_rel->type == KE_IGNORE); | 187 | autorelease = val && (!ke_rel || ke_rel->type == KE_IGNORE); |
| 158 | 188 | ||
| 159 | if (sparse_keymap_report_event(priv->input_dev, event, val, autorelease)) | 189 | sparse_keymap_report_event(input_dev, event, val, autorelease); |
| 160 | return; | ||
| 161 | |||
| 162 | out_unknown: | ||
| 163 | dev_dbg(&device->dev, "unknown event index 0x%x\n", event); | ||
| 164 | } | ||
| 165 | |||
| 166 | static bool intel_vbtn_has_buttons(acpi_handle handle) | ||
| 167 | { | ||
| 168 | acpi_status status; | ||
| 169 | |||
| 170 | status = acpi_evaluate_object(handle, "VBDL", NULL, NULL); | ||
| 171 | return ACPI_SUCCESS(status); | ||
| 172 | } | 190 | } |
| 173 | 191 | ||
| 174 | /* | 192 | /* |
| @@ -245,7 +263,7 @@ static int intel_vbtn_probe(struct platform_device *device) · 70 unmodified lines | |||
| 245 | acpi_status status; | 263 | acpi_status status; |
| 246 | int err; | 264 | int err; |
| 247 | 265 | ||
| 248 | has_buttons = intel_vbtn_has_buttons(handle); | 266 | has_buttons = acpi_has_method(handle, "VBDL"); |
| 249 | has_switches = intel_vbtn_has_switches(handle); | 267 | has_switches = intel_vbtn_has_switches(handle); |
| 250 | 268 | ||
| 251 | if (!has_buttons && !has_switches) { | 269 | if (!has_buttons && !has_switches) { |
| @@ -274,6 +292,12 @@ static int intel_vbtn_probe(struct platform_device *device) · 22 unmodified lines | |||
| 274 | if (ACPI_FAILURE(status)) | 292 | if (ACPI_FAILURE(status)) |
| 275 | return -EBUSY; | 293 | return -EBUSY; |
| 276 | 294 | ||
| 295 | if (has_buttons) { | ||
| 296 | status = acpi_evaluate_object(handle, "VBDL", NULL, NULL); | ||
| 297 | if (ACPI_FAILURE(status)) | ||
| 298 | dev_err(&device->dev, "Error VBDL failed with ACPI status %d\n", status); | ||
| 299 | } | ||
| 300 | |||
| 277 | device_init_wakeup(&device->dev, true); | 301 | device_init_wakeup(&device->dev, true); |
| 278 | /* | 302 | /* |
| 279 | * In order for system wakeup to work, the EC GPE has to be marked as | 303 | * In order for system wakeup to work, the EC GPE has to be marked as |
| @@ -1,233 +0,0 @@ | |||
| 1 | // SPDX-License-Identifier: GPL-2.0 | ||
| 2 | /* | ||
| 3 | * Power button driver for Intel MID platforms. | ||
| 4 | * | ||
| 5 | * Copyright (C) 2010,2017 Intel Corp | ||
| 6 | * | ||
| 7 | * Author: Hong Liu <hong.liu@intel.com> | ||
| 8 | * Author: Andy Shevchenko <andriy.shevchenko@linux.intel.com> | ||
| 9 | */ | ||
| 10 | |||
| 11 | #include <linux/input.h> | ||
| 12 | #include <linux/interrupt.h> | ||
| 13 | #include <linux/mfd/intel_msic.h> | ||
| 14 | #include <linux/module.h> | ||
| 15 | #include <linux/platform_device.h> | ||
| 16 | #include <linux/pm_wakeirq.h> | ||
| 17 | #include <linux/slab.h> | ||
| 18 | |||
| 19 | #include <asm/cpu_device_id.h> | ||
| 20 | #include <asm/intel-family.h> | ||
| 21 | #include <asm/intel_scu_ipc.h> | ||
| 22 | |||
| 23 | #define DRIVER_NAME "msic_power_btn" | ||
| 24 | |||
| 25 | #define MSIC_PB_LEVEL (1 << 3) /* 1 - release, 0 - press */ | ||
| 26 | |||
| 27 | /* | ||
| 28 | * MSIC document ti_datasheet defines the 1st bit reg 0x21 is used to mask | ||
| 29 | * power button interrupt | ||
| 30 | */ | ||
| 31 | #define MSIC_PWRBTNM (1 << 0) | ||
| 32 | |||
| 33 | /* Intel Tangier */ | ||
| 34 | #define BCOVE_PB_LEVEL (1 << 4) /* 1 - release, 0 - press */ | ||
| 35 | |||
| 36 | /* Basin Cove PMIC */ | ||
| 37 | #define BCOVE_PBIRQ 0x02 | ||
| 38 | #define BCOVE_IRQLVL1MSK 0x0c | ||
| 39 | #define BCOVE_PBIRQMASK 0x0d | ||
| 40 | #define BCOVE_PBSTATUS 0x27 | ||
| 41 | |||
| 42 | struct mid_pb_ddata { | ||
| 43 | struct device *dev; | ||
| 44 | int irq; | ||
| 45 | struct input_dev *input; | ||
| 46 | unsigned short mirqlvl1_addr; | ||
| 47 | unsigned short pbstat_addr; | ||
| 48 | u8 pbstat_mask; | ||
| 49 | struct intel_scu_ipc_dev *scu; | ||
| 50 | int (*setup)(struct mid_pb_ddata *ddata); | ||
| 51 | }; | ||
| 52 | |||
| 53 | static int mid_pbstat(struct mid_pb_ddata *ddata, int *value) | ||
| 54 | { | ||
| 55 | struct input_dev *input = ddata->input; | ||
| 56 | int ret; | ||
| 57 | u8 pbstat; | ||
| 58 | |||
| 59 | ret = intel_scu_ipc_dev_ioread8(ddata->scu, ddata->pbstat_addr, | ||
| 60 | &pbstat); | ||
| 61 | if (ret) | ||
| 62 | return ret; | ||
| 63 | |||
| 64 | dev_dbg(input->dev.parent, "PB_INT status= %d\n", pbstat); | ||
| 65 | |||
| 66 | *value = !(pbstat & ddata->pbstat_mask); | ||
| 67 | return 0; | ||
| 68 | } | ||
| 69 | |||
| 70 | static int mid_irq_ack(struct mid_pb_ddata *ddata) | ||
| 71 | { | ||
| 72 | return intel_scu_ipc_dev_update(ddata->scu, ddata->mirqlvl1_addr, 0, | ||
| 73 | MSIC_PWRBTNM); | ||
| 74 | } | ||
| 75 | |||
| 76 | static int mrfld_setup(struct mid_pb_ddata *ddata) | ||
| 77 | { | ||
| 78 | /* Unmask the PBIRQ and MPBIRQ on Tangier */ | ||
| 79 | intel_scu_ipc_dev_update(ddata->scu, BCOVE_PBIRQ, 0, MSIC_PWRBTNM); | ||
| 80 | intel_scu_ipc_dev_update(ddata->scu, BCOVE_PBIRQMASK, 0, MSIC_PWRBTNM); | ||
| 81 | |||
| 82 | return 0; | ||
| 83 | } | ||
| 84 | |||
| 85 | static irqreturn_t mid_pb_isr(int irq, void *dev_id) | ||
| 86 | { | ||
| 87 | struct mid_pb_ddata *ddata = dev_id; | ||
| 88 | struct input_dev *input = ddata->input; | ||
| 89 | int value = 0; | ||
| 90 | int ret; | ||
| 91 | |||
| 92 | ret = mid_pbstat(ddata, &value); | ||
| 93 | if (ret < 0) { | ||
| 94 | dev_err(input->dev.parent, | ||
| 95 | "Read error %d while reading MSIC_PB_STATUS\n", ret); | ||
| 96 | } else { | ||
| 97 | input_event(input, EV_KEY, KEY_POWER, value); | ||
| 98 | input_sync(input); | ||
| 99 | } | ||
| 100 | |||
| 101 | mid_irq_ack(ddata); | ||
| 102 | return IRQ_HANDLED; | ||
| 103 | } | ||
| 104 | |||
| 105 | static const struct mid_pb_ddata mfld_ddata = { | ||
| 106 | .mirqlvl1_addr = INTEL_MSIC_IRQLVL1MSK, | ||
| 107 | .pbstat_addr = INTEL_MSIC_PBSTATUS, | ||
| 108 | .pbstat_mask = MSIC_PB_LEVEL, | ||
| 109 | }; | ||
| 110 | |||
| 111 | static const struct mid_pb_ddata mrfld_ddata = { | ||
| 112 | .mirqlvl1_addr = BCOVE_IRQLVL1MSK, | ||
| 113 | .pbstat_addr = BCOVE_PBSTATUS, | ||
| 114 | .pbstat_mask = BCOVE_PB_LEVEL, | ||
| 115 | .setup = mrfld_setup, | ||
| 116 | }; | ||
| 117 | |||
| 118 | static const struct x86_cpu_id mid_pb_cpu_ids[] = { | ||
| 119 | X86_MATCH_INTEL_FAM6_MODEL(ATOM_SALTWELL_MID, &mfld_ddata), | ||
| 120 | X86_MATCH_INTEL_FAM6_MODEL(ATOM_SILVERMONT_MID, &mrfld_ddata), | ||
| 121 | {} | ||
| 122 | }; | ||
| 123 | |||
| 124 | static int mid_pb_probe(struct platform_device *pdev) | ||
| 125 | { | ||
| 126 | const struct x86_cpu_id *id; | ||
| 127 | struct mid_pb_ddata *ddata; | ||
| 128 | struct input_dev *input; | ||
| 129 | int irq = platform_get_irq(pdev, 0); | ||
| 130 | int error; | ||
| 131 | |||
| 132 | id = x86_match_cpu(mid_pb_cpu_ids); | ||
| 133 | if (!id) | ||
| 134 | return -ENODEV; | ||
| 135 | |||
| 136 | if (irq < 0) { | ||
| 137 | dev_err(&pdev->dev, "Failed to get IRQ: %d\n", irq); | ||
| 138 | return irq; | ||
| 139 | } | ||
| 140 | |||
| 141 | input = devm_input_allocate_device(&pdev->dev); | ||
| 142 | if (!input) | ||
| 143 | return -ENOMEM; | ||
| 144 | |||
| 145 | input->name = pdev->name; | ||
| 146 | input->phys = "power-button/input0"; | ||
| 147 | input->id.bustype = BUS_HOST; | ||
| 148 | input->dev.parent = &pdev->dev; | ||
| 149 | |||
| 150 | input_set_capability(input, EV_KEY, KEY_POWER); | ||
| 151 | |||
| 152 | ddata = devm_kmemdup(&pdev->dev, (void *)id->driver_data, | ||
| 153 | sizeof(*ddata), GFP_KERNEL); | ||
| 154 | if (!ddata) | ||
| 155 | return -ENOMEM; | ||
| 156 | |||
| 157 | ddata->dev = &pdev->dev; | ||
| 158 | ddata->irq = irq; | ||
| 159 | ddata->input = input; | ||
| 160 | |||
| 161 | if (ddata->setup) { | ||
| 162 | error = ddata->setup(ddata); | ||
| 163 | if (error) | ||
| 164 | return error; | ||
| 165 | } | ||
| 166 | |||
| 167 | ddata->scu = devm_intel_scu_ipc_dev_get(&pdev->dev); | ||
| 168 | if (!ddata->scu) | ||
| 169 | return -EPROBE_DEFER; | ||
| 170 | |||
| 171 | error = devm_request_threaded_irq(&pdev->dev, irq, NULL, mid_pb_isr, | ||
| 172 | IRQF_ONESHOT, DRIVER_NAME, ddata); | ||
| 173 | if (error) { | ||
| 174 | dev_err(&pdev->dev, | ||
| 175 | "Unable to request irq %d for MID power button\n", irq); | ||
| 176 | return error; | ||
| 177 | } | ||
| 178 | |||
| 179 | error = input_register_device(input); | ||
| 180 | if (error) { | ||
| 181 | dev_err(&pdev->dev, | ||
| 182 | "Unable to register input dev, error %d\n", error); | ||
| 183 | return error; | ||
| 184 | } | ||
| 185 | |||
| 186 | platform_set_drvdata(pdev, ddata); | ||
| 187 | |||
| 188 | /* | ||
| 189 | * SCU firmware might send power button interrupts to IA core before | ||
| 190 | * kernel boots and doesn't get EOI from IA core. The first bit of | ||
| 191 | * MSIC reg 0x21 is kept masked, and SCU firmware doesn't send new | ||
| 192 | * power interrupt to Android kernel. Unmask the bit when probing | ||
| 193 | * power button in kernel. | ||
| 194 | * There is a very narrow race between irq handler and power button | ||
| 195 | * initialization. The race happens rarely. So we needn't worry | ||
| 196 | * about it. | ||
| 197 | */ | ||
| 198 | error = mid_irq_ack(ddata); | ||
| 199 | if (error) { | ||
| 200 | dev_err(&pdev->dev, | ||
| 201 | "Unable to clear power button interrupt, error: %d\n", | ||
| 202 | error); | ||
| 203 | return error; | ||
| 204 | } | ||
| 205 | |||
| 206 | device_init_wakeup(&pdev->dev, true); | ||
| 207 | dev_pm_set_wake_irq(&pdev->dev, irq); | ||
| 208 | |||
| 209 | return 0; | ||
| 210 | } | ||
| 211 | |||
| 212 | static int mid_pb_remove(struct platform_device *pdev) | ||
| 213 | { | ||
| 214 | dev_pm_clear_wake_irq(&pdev->dev); | ||
| 215 | device_init_wakeup(&pdev->dev, false); | ||
| 216 | |||
| 217 | return 0; | ||
| 218 | } | ||
| 219 | |||
| 220 | static struct platform_driver mid_pb_driver = { | ||
| 221 | .driver = { | ||
| 222 | .name = DRIVER_NAME, | ||
| 223 | }, | ||
| 224 | .probe = mid_pb_probe, | ||
| 225 | .remove = mid_pb_remove, | ||
| 226 | }; | ||
| 227 | |||
| 228 | module_platform_driver(mid_pb_driver); | ||
| 229 | |||
| 230 | MODULE_AUTHOR("Hong Liu <hong.liu@intel.com>"); | ||
| 231 | MODULE_DESCRIPTION("Intel MID Power Button Driver"); | ||
| 232 | MODULE_LICENSE("GPL v2"); | ||
| 233 | MODULE_ALIAS("platform:" DRIVER_NAME); | ||
| @@ -1,560 +0,0 @@ | |||
| 1 | // SPDX-License-Identifier: GPL-2.0 | ||
| 2 | /* | ||
| 3 | * Intel MID platform thermal driver | ||
| 4 | * | ||
| 5 | * Copyright (C) 2011 Intel Corporation | ||
| 6 | * | ||
| 7 | * Author: Durgadoss R <durgadoss.r@intel.com> | ||
| 8 | */ | ||
| 9 | |||
| 10 | #define pr_fmt(fmt) "intel_mid_thermal: " fmt | ||
| 11 | |||
| 12 | #include <linux/device.h> | ||
| 13 | #include <linux/err.h> | ||
| 14 | #include <linux/mfd/intel_msic.h> | ||
| 15 | #include <linux/module.h> | ||
| 16 | #include <linux/param.h> | ||
| 17 | #include <linux/platform_device.h> | ||
| 18 | #include <linux/pm.h> | ||
| 19 | #include <linux/slab.h> | ||
| 20 | #include <linux/thermal.h> | ||
| 21 | |||
| 22 | /* Number of thermal sensors */ | ||
| 23 | #define MSIC_THERMAL_SENSORS 4 | ||
| 24 | |||
| 25 | /* ADC1 - thermal registers */ | ||
| 26 | #define MSIC_ADC_ENBL 0x10 | ||
| 27 | #define MSIC_ADC_START 0x08 | ||
| 28 | |||
| 29 | #define MSIC_ADCTHERM_ENBL 0x04 | ||
| 30 | #define MSIC_ADCRRDATA_ENBL 0x05 | ||
| 31 | #define MSIC_CHANL_MASK_VAL 0x0F | ||
| 32 | |||
| 33 | #define MSIC_STOPBIT_MASK 16 | ||
| 34 | #define MSIC_ADCTHERM_MASK 4 | ||
| 35 | /* Number of ADC channels */ | ||
| 36 | #define ADC_CHANLS_MAX 15 | ||
| 37 | #define ADC_LOOP_MAX (ADC_CHANLS_MAX - MSIC_THERMAL_SENSORS) | ||
| 38 | |||
| 39 | /* ADC channel code values */ | ||
| 40 | #define SKIN_SENSOR0_CODE 0x08 | ||
| 41 | #define SKIN_SENSOR1_CODE 0x09 | ||
| 42 | #define SYS_SENSOR_CODE 0x0A | ||
| 43 | #define MSIC_DIE_SENSOR_CODE 0x03 | ||
| 44 | |||
| 45 | #define SKIN_THERM_SENSOR0 0 | ||
| 46 | #define SKIN_THERM_SENSOR1 1 | ||
| 47 | #define SYS_THERM_SENSOR2 2 | ||
| 48 | #define MSIC_DIE_THERM_SENSOR3 3 | ||
| 49 | |||
| 50 | /* ADC code range */ | ||
| 51 | #define ADC_MAX 977 | ||
| 52 | #define ADC_MIN 162 | ||
| 53 | #define ADC_VAL0C 887 | ||
| 54 | #define ADC_VAL20C 720 | ||
| 55 | #define ADC_VAL40C 508 | ||
| 56 | #define ADC_VAL60C 315 | ||
| 57 | |||
| 58 | /* ADC base addresses */ | ||
| 59 | #define ADC_CHNL_START_ADDR INTEL_MSIC_ADC1ADDR0 /* increments by 1 */ | ||
| 60 | #define ADC_DATA_START_ADDR INTEL_MSIC_ADC1SNS0H /* increments by 2 */ | ||
| 61 | |||
| 62 | /* MSIC die attributes */ | ||
| 63 | #define MSIC_DIE_ADC_MIN 488 | ||
| 64 | #define MSIC_DIE_ADC_MAX 1004 | ||
| 65 | |||
| 66 | /* This holds the address of the first free ADC channel, | ||
| 67 | * among the 15 channels | ||
| 68 | */ | ||
| 69 | static int channel_index; | ||
| 70 | |||
| 71 | struct platform_info { | ||
| 72 | struct platform_device *pdev; | ||
| 73 | struct thermal_zone_device *tzd[MSIC_THERMAL_SENSORS]; | ||
| 74 | }; | ||
| 75 | |||
| 76 | struct thermal_device_info { | ||
| 77 | unsigned int chnl_addr; | ||
| 78 | int direct; | ||
| 79 | /* This holds the current temperature in millidegree celsius */ | ||
| 80 | long curr_temp; | ||
| 81 | }; | ||
| 82 | |||
| 83 | /** | ||
| 84 | * to_msic_die_temp - converts adc_val to msic_die temperature | ||
| 85 | * @adc_val: ADC value to be converted | ||
| 86 | * | ||
| 87 | * Can sleep | ||
| 88 | */ | ||
| 89 | static int to_msic_die_temp(uint16_t adc_val) | ||
| 90 | { | ||
| 91 | return (368 * (adc_val) / 1000) - 220; | ||
| 92 | } | ||
| 93 | |||
| 94 | /** | ||
| 95 | * is_valid_adc - checks whether the adc code is within the defined range | ||
| 96 | * @min: minimum value for the sensor | ||
| 97 | * @max: maximum value for the sensor | ||
| 98 | * | ||
| 99 | * Can sleep | ||
| 100 | */ | ||
| 101 | static int is_valid_adc(uint16_t adc_val, uint16_t min, uint16_t max) | ||
| 102 | { | ||
| 103 | return (adc_val >= min) && (adc_val <= max); | ||
| 104 | } | ||
| 105 | |||
| 106 | /** | ||
| 107 | * adc_to_temp - converts the ADC code to temperature in C | ||
| 108 | * @direct: true if ths channel is direct index | ||
| 109 | * @adc_val: the adc_val that needs to be converted | ||
| 110 | * @tp: temperature return value | ||
| 111 | * | ||
| 112 | * Linear approximation is used to covert the skin adc value into temperature. | ||
| 113 | * This technique is used to avoid very long look-up table to get | ||
| 114 | * the appropriate temp value from ADC value. | ||
| 115 | * The adc code vs sensor temp curve is split into five parts | ||
| 116 | * to achieve very close approximate temp value with less than | ||
| 117 | * 0.5C error | ||
| 118 | */ | ||
| 119 | static int adc_to_temp(int direct, uint16_t adc_val, int *tp) | ||
| 120 | { | ||
| 121 | int temp; | ||
| 122 | |||
| 123 | /* Direct conversion for die temperature */ | ||
| 124 | if (direct) { | ||
| 125 | if (is_valid_adc(adc_val, MSIC_DIE_ADC_MIN, MSIC_DIE_ADC_MAX)) { | ||
| 126 | *tp = to_msic_die_temp(adc_val) * 1000; | ||
| 127 | return 0; | ||
| 128 | } | ||
| 129 | return -ERANGE; | ||
| 130 | } | ||
| 131 | |||
| 132 | if (!is_valid_adc(adc_val, ADC_MIN, ADC_MAX)) | ||
| 133 | return -ERANGE; | ||
| 134 | |||
| 135 | /* Linear approximation for skin temperature */ | ||
| 136 | if (adc_val > ADC_VAL0C) | ||
| 137 | temp = 177 - (adc_val/5); | ||
| 138 | else if ((adc_val <= ADC_VAL0C) && (adc_val > ADC_VAL20C)) | ||
| 139 | temp = 111 - (adc_val/8); | ||
| 140 | else if ((adc_val <= ADC_VAL20C) && (adc_val > ADC_VAL40C)) | ||
| 141 | temp = 92 - (adc_val/10); | ||
| 142 | else if ((adc_val <= ADC_VAL40C) && (adc_val > ADC_VAL60C)) | ||
| 143 | temp = 91 - (adc_val/10); | ||
| 144 | else | ||
| 145 | temp = 112 - (adc_val/6); | ||
| 146 | |||
| 147 | /* Convert temperature in celsius to milli degree celsius */ | ||
| 148 | *tp = temp * 1000; | ||
| 149 | return 0; | ||
| 150 | } | ||
| 151 | |||
| 152 | /** | ||
| 153 | * mid_read_temp - read sensors for temperature | ||
| 154 | * @temp: holds the current temperature for the sensor after reading | ||
| 155 | * | ||
| 156 | * reads the adc_code from the channel and converts it to real | ||
| 157 | * temperature. The converted value is stored in temp. | ||
| 158 | * | ||
| 159 | * Can sleep | ||
| 160 | */ | ||
| 161 | static int mid_read_temp(struct thermal_zone_device *tzd, int *temp) | ||
| 162 | { | ||
| 163 | struct thermal_device_info *td_info = tzd->devdata; | ||
| 164 | uint16_t adc_val, addr; | ||
| 165 | uint8_t data = 0; | ||
| 166 | int ret; | ||
| 167 | int curr_temp; | ||
| 168 | |||
| 169 | addr = td_info->chnl_addr; | ||
| 170 | |||
| 171 | /* Enable the msic for conversion before reading */ | ||
| 172 | ret = intel_msic_reg_write(INTEL_MSIC_ADC1CNTL3, MSIC_ADCRRDATA_ENBL); | ||
| 173 | if (ret) | ||
| 174 | return ret; | ||
| 175 | |||
| 176 | /* Re-toggle the RRDATARD bit (temporary workaround) */ | ||
| 177 | ret = intel_msic_reg_write(INTEL_MSIC_ADC1CNTL3, MSIC_ADCTHERM_ENBL); | ||
| 178 | if (ret) | ||
| 179 | return ret; | ||
| 180 | |||
| 181 | /* Read the higher bits of data */ | ||
| 182 | ret = intel_msic_reg_read(addr, &data); | ||
| 183 | if (ret) | ||
| 184 | return ret; | ||
| 185 | |||
| 186 | /* Shift bits to accommodate the lower two data bits */ | ||
| 187 | adc_val = (data << 2); | ||
| 188 | addr++; | ||
| 189 | |||
| 190 | ret = intel_msic_reg_read(addr, &data);/* Read lower bits */ | ||
| 191 | if (ret) | ||
| 192 | return ret; | ||
| 193 | |||
| 194 | /* Adding lower two bits to the higher bits */ | ||
| 195 | data &= 03; | ||
| 196 | adc_val += data; | ||
| 197 | |||
| 198 | /* Convert ADC value to temperature */ | ||
| 199 | ret = adc_to_temp(td_info->direct, adc_val, &curr_temp); | ||
| 200 | if (ret == 0) | ||
| 201 | *temp = td_info->curr_temp = curr_temp; | ||
| 202 | return ret; | ||
| 203 | } | ||
| 204 | |||
| 205 | /** | ||
| 206 | * configure_adc - enables/disables the ADC for conversion | ||
| 207 | * @val: zero: disables the ADC non-zero:enables the ADC | ||
| 208 | * | ||
| 209 | * Enable/Disable the ADC depending on the argument | ||
| 210 | * | ||
| 211 | * Can sleep | ||
| 212 | */ | ||
| 213 | static int configure_adc(int val) | ||
| 214 | { | ||
| 215 | int ret; | ||
| 216 | uint8_t data; | ||
| 217 | |||
| 218 | ret = intel_msic_reg_read(INTEL_MSIC_ADC1CNTL1, &data); | ||
| 219 | if (ret) | ||
| 220 | return ret; | ||
| 221 | |||
| 222 | if (val) { | ||
| 223 | /* Enable and start the ADC */ | ||
| 224 | data |= (MSIC_ADC_ENBL | MSIC_ADC_START); | ||
| 225 | } else { | ||
| 226 | /* Just stop the ADC */ | ||
| 227 | data &= (~MSIC_ADC_START); | ||
| 228 | } | ||
| 229 | return intel_msic_reg_write(INTEL_MSIC_ADC1CNTL1, data); | ||
| 230 | } | ||
| 231 | |||
| 232 | /** | ||
| 233 | * set_up_therm_channel - enable thermal channel for conversion | ||
| 234 | * @base_addr: index of free msic ADC channel | ||
| 235 | * | ||
| 236 | * Enable all the three channels for conversion | ||
| 237 | * | ||
| 238 | * Can sleep | ||
| 239 | */ | ||
| 240 | static int set_up_therm_channel(u16 base_addr) | ||
| 241 | { | ||
| 242 | int ret; | ||
| 243 | |||
| 244 | /* Enable all the sensor channels */ | ||
| 245 | ret = intel_msic_reg_write(base_addr, SKIN_SENSOR0_CODE); | ||
| 246 | if (ret) | ||
| 247 | return ret; | ||
| 248 | |||
| 249 | ret = intel_msic_reg_write(base_addr + 1, SKIN_SENSOR1_CODE); | ||
| 250 | if (ret) | ||
| 251 | return ret; | ||
| 252 | |||
| 253 | ret = intel_msic_reg_write(base_addr + 2, SYS_SENSOR_CODE); | ||
| 254 | if (ret) | ||
| 255 | return ret; | ||
| 256 | |||
| 257 | /* Since this is the last channel, set the stop bit | ||
| 258 | * to 1 by ORing the DIE_SENSOR_CODE with 0x10 */ | ||
| 259 | ret = intel_msic_reg_write(base_addr + 3, | ||
| 260 | (MSIC_DIE_SENSOR_CODE | 0x10)); | ||
| 261 | if (ret) | ||
| 262 | return ret; | ||
| 263 | |||
| 264 | /* Enable ADC and start it */ | ||
| 265 | return configure_adc(1); | ||
| 266 | } | ||
| 267 | |||
| 268 | /** | ||
| 269 | * reset_stopbit - sets the stop bit to 0 on the given channel | ||
| 270 | * @addr: address of the channel | ||
| 271 | * | ||
| 272 | * Can sleep | ||
| 273 | */ | ||
| 274 | static int reset_stopbit(uint16_t addr) | ||
| 275 | { | ||
| 276 | int ret; | ||
| 277 | uint8_t data; | ||
| 278 | ret = intel_msic_reg_read(addr, &data); | ||
| 279 | if (ret) | ||
| 280 | return ret; | ||
| 281 | /* Set the stop bit to zero */ | ||
| 282 | return intel_msic_reg_write(addr, (data & 0xEF)); | ||
| 283 | } | ||
| 284 | |||
| 285 | /** | ||
| 286 | * find_free_channel - finds an empty channel for conversion | ||
| 287 | * | ||
| 288 | * If the ADC is not enabled then start using 0th channel | ||
| 289 | * itself. Otherwise find an empty channel by looking for a | ||
| 290 | * channel in which the stopbit is set to 1. returns the index | ||
| 291 | * of the first free channel if succeeds or an error code. | ||
| 292 | * | ||
| 293 | * Context: can sleep | ||
| 294 | * | ||
| 295 | * FIXME: Ultimately the channel allocator will move into the intel_scu_ipc | ||
| 296 | * code. | ||
| 297 | */ | ||
| 298 | static int find_free_channel(void) | ||
| 299 | { | ||
| 300 | int ret; | ||
| 301 | int i; | ||
| 302 | uint8_t data; | ||
| 303 | |||
| 304 | /* check whether ADC is enabled */ | ||
| 305 | ret = intel_msic_reg_read(INTEL_MSIC_ADC1CNTL1, &data); | ||
| 306 | if (ret) | ||
| 307 | return ret; | ||
| 308 | |||
| 309 | if ((data & MSIC_ADC_ENBL) == 0) | ||
| 310 | return 0; | ||
| 311 | |||
| 312 | /* ADC is already enabled; Looking for an empty channel */ | ||
| 313 | for (i = 0; i < ADC_CHANLS_MAX; i++) { | ||
| 314 | ret = intel_msic_reg_read(ADC_CHNL_START_ADDR + i, &data); | ||
| 315 | if (ret) | ||
| 316 | return ret; | ||
| 317 | |||
| 318 | if (data & MSIC_STOPBIT_MASK) { | ||
| 319 | ret = i; | ||
| 320 | break; | ||
| 321 | } | ||
| 322 | } | ||
| 323 | return (ret > ADC_LOOP_MAX) ? (-EINVAL) : ret; | ||
| 324 | } | ||
| 325 | |||
| 326 | /** | ||
| 327 | * mid_initialize_adc - initializing the ADC | ||
| 328 | * @dev: our device structure | ||
| 329 | * | ||
| 330 | * Initialize the ADC for reading thermistor values. Can sleep. | ||
| 331 | */ | ||
| 332 | static int mid_initialize_adc(struct device *dev) | ||
| 333 | { | ||
| 334 | u8 data; | ||
| 335 | u16 base_addr; | ||
| 336 | int ret; | ||
| 337 | |||
| 338 | /* | ||
| 339 | * Ensure that adctherm is disabled before we | ||
| 340 | * initialize the ADC | ||
| 341 | */ | ||
| 342 | ret = intel_msic_reg_read(INTEL_MSIC_ADC1CNTL3, &data); | ||
| 343 | if (ret) | ||
| 344 | return ret; | ||
| 345 | |||
| 346 | data &= ~MSIC_ADCTHERM_MASK; | ||
| 347 | ret = intel_msic_reg_write(INTEL_MSIC_ADC1CNTL3, data); | ||
| 348 | if (ret) | ||
| 349 | return ret; | ||
| 350 | |||
| 351 | /* Index of the first channel in which the stop bit is set */ | ||
| 352 | channel_index = find_free_channel(); | ||
| 353 | if (channel_index < 0) { | ||
| 354 | dev_err(dev, "No free ADC channels"); | ||
| 355 | return channel_index; | ||
| 356 | } | ||
| 357 | |||
| 358 | base_addr = ADC_CHNL_START_ADDR + channel_index; | ||
| 359 | |||
| 360 | if (!(channel_index == 0 || channel_index == ADC_LOOP_MAX)) { | ||
| 361 | /* Reset stop bit for channels other than 0 and 12 */ | ||
| 362 | ret = reset_stopbit(base_addr); | ||
| 363 | if (ret) | ||
| 364 | return ret; | ||
| 365 | |||
| 366 | /* Index of the first free channel */ | ||
| 367 | base_addr++; | ||
| 368 | channel_index++; | ||
| 369 | } | ||
| 370 | |||
| 371 | ret = set_up_therm_channel(base_addr); | ||
| 372 | if (ret) { | ||
| 373 | dev_err(dev, "unable to enable ADC"); | ||
| 374 | return ret; | ||
| 375 | } | ||
| 376 | dev_dbg(dev, "ADC initialization successful"); | ||
| 377 | return ret; | ||
| 378 | } | ||
| 379 | |||
| 380 | /** | ||
| 381 | * initialize_sensor - sets default temp and timer ranges | ||
| 382 | * @index: index of the sensor | ||
| 383 | * | ||
| 384 | * Context: can sleep | ||
| 385 | */ | ||
| 386 | static struct thermal_device_info *initialize_sensor(int index) | ||
| 387 | { | ||
| 388 | struct thermal_device_info *td_info = | ||
| 389 | kzalloc(sizeof(struct thermal_device_info), GFP_KERNEL); | ||
| 390 | |||
| 391 | if (!td_info) | ||
| 392 | return NULL; | ||
| 393 | |||
| 394 | /* Set the base addr of the channel for this sensor */ | ||
| 395 | td_info->chnl_addr = ADC_DATA_START_ADDR + 2 * (channel_index + index); | ||
| 396 | /* Sensor 3 is direct conversion */ | ||
| 397 | if (index == 3) | ||
| 398 | td_info->direct = 1; | ||
| 399 | return td_info; | ||
| 400 | } | ||
| 401 | |||
| 402 | #ifdef CONFIG_PM_SLEEP | ||
| 403 | /** | ||
| 404 | * mid_thermal_resume - resume routine | ||
| 405 | * @dev: device structure | ||
| 406 | * | ||
| 407 | * mid thermal resume: re-initializes the adc. Can sleep. | ||
| 408 | */ | ||
| 409 | static int mid_thermal_resume(struct device *dev) | ||
| 410 | { | ||
| 411 | return mid_initialize_adc(dev); | ||
| 412 | } | ||
| 413 | |||
| 414 | /** | ||
| 415 | * mid_thermal_suspend - suspend routine | ||
| 416 | * @dev: device structure | ||
| 417 | * | ||
| 418 | * mid thermal suspend implements the suspend functionality | ||
| 419 | * by stopping the ADC. Can sleep. | ||
| 420 | */ | ||
| 421 | static int mid_thermal_suspend(struct device *dev) | ||
| 422 | { | ||
| 423 | /* | ||
| 424 | * This just stops the ADC and does not disable it. | ||
| 425 | * temporary workaround until we have a generic ADC driver. | ||
| 426 | * If 0 is passed, it disables the ADC. | ||
| 427 | */ | ||
| 428 | return configure_adc(0); | ||
| 429 | } | ||
| 430 | #endif | ||
| 431 | |||
| 432 | static SIMPLE_DEV_PM_OPS(mid_thermal_pm, | ||
| 433 | mid_thermal_suspend, mid_thermal_resume); | ||
| 434 | |||
| 435 | /** | ||
| 436 | * read_curr_temp - reads the current temperature and stores in temp | ||
| 437 | * @temp: holds the current temperature value after reading | ||
| 438 | * | ||
| 439 | * Can sleep | ||
| 440 | */ | ||
| 441 | static int read_curr_temp(struct thermal_zone_device *tzd, int *temp) | ||
| 442 | { | ||
| 443 | WARN_ON(tzd == NULL); | ||
| 444 | return mid_read_temp(tzd, temp); | ||
| 445 | } | ||
| 446 | |||
| 447 | /* Can't be const */ | ||
| 448 | static struct thermal_zone_device_ops tzd_ops = { | ||
| 449 | .get_temp = read_curr_temp, | ||
| 450 | }; | ||
| 451 | |||
| 452 | /** | ||
| 453 | * mid_thermal_probe - mfld thermal initialize | ||
| 454 | * @pdev: platform device structure | ||
| 455 | * | ||
| 456 | * mid thermal probe initializes the hardware and registers | ||
| 457 | * all the sensors with the generic thermal framework. Can sleep. | ||
| 458 | */ | ||
| 459 | static int mid_thermal_probe(struct platform_device *pdev) | ||
| 460 | { | ||
| 461 | static char *name[MSIC_THERMAL_SENSORS] = { | ||
| 462 | "skin0", "skin1", "sys", "msicdie" | ||
| 463 | }; | ||
| 464 | |||
| 465 | int ret; | ||
| 466 | int i; | ||
| 467 | struct platform_info *pinfo; | ||
| 468 | |||
| 469 | pinfo = devm_kzalloc(&pdev->dev, sizeof(struct platform_info), | ||
| 470 | GFP_KERNEL); | ||
| 471 | if (!pinfo) | ||
| 472 | return -ENOMEM; | ||
| 473 | |||
| 474 | /* Initializing the hardware */ | ||
| 475 | ret = mid_initialize_adc(&pdev->dev); | ||
| 476 | if (ret) { | ||
| 477 | dev_err(&pdev->dev, "ADC init failed"); | ||
| 478 | return ret; | ||
| 479 | } | ||
| 480 | |||
| 481 | /* Register each sensor with the generic thermal framework*/ | ||
| 482 | for (i = 0; i < MSIC_THERMAL_SENSORS; i++) { | ||
| 483 | struct thermal_device_info *td_info = initialize_sensor(i); | ||
| 484 | |||
| 485 | if (!td_info) { | ||
| 486 | ret = -ENOMEM; | ||
| 487 | goto err; | ||
| 488 | } | ||
| 489 | pinfo->tzd[i] = thermal_zone_device_register(name[i], | ||
| 490 | 0, 0, td_info, &tzd_ops, NULL, 0, 0); | ||
| 491 | if (IS_ERR(pinfo->tzd[i])) { | ||
| 492 | kfree(td_info); | ||
| 493 | ret = PTR_ERR(pinfo->tzd[i]); | ||
| 494 | goto err; | ||
| 495 | } | ||
| 496 | ret = thermal_zone_device_enable(pinfo->tzd[i]); | ||
| 497 | if (ret) { | ||
| 498 | kfree(td_info); | ||
| 499 | thermal_zone_device_unregister(pinfo->tzd[i]); | ||
| 500 | goto err; | ||
| 501 | } | ||
| 502 | } | ||
| 503 | |||
| 504 | pinfo->pdev = pdev; | ||
| 505 | platform_set_drvdata(pdev, pinfo); | ||
| 506 | return 0; | ||
| 507 | |||
| 508 | err: | ||
| 509 | while (--i >= 0) { | ||
| 510 | kfree(pinfo->tzd[i]->devdata); | ||
| 511 | thermal_zone_device_unregister(pinfo->tzd[i]); | ||
| 512 | } | ||
| 513 | configure_adc(0); | ||
| 514 | return ret; | ||
| 515 | } | ||
| 516 | |||
| 517 | /** | ||
| 518 | * mid_thermal_remove - mfld thermal finalize | ||
| 519 | * @dev: platform device structure | ||
| 520 | * | ||
| 521 | * MLFD thermal remove unregisters all the sensors from the generic | ||
| 522 | * thermal framework. Can sleep. | ||
| 523 | */ | ||
| 524 | static int mid_thermal_remove(struct platform_device *pdev) | ||
| 525 | { | ||
| 526 | int i; | ||
| 527 | struct platform_info *pinfo = platform_get_drvdata(pdev); | ||
| 528 | |||
| 529 | for (i = 0; i < MSIC_THERMAL_SENSORS; i++) { | ||
| 530 | kfree(pinfo->tzd[i]->devdata); | ||
| 531 | thermal_zone_device_unregister(pinfo->tzd[i]); | ||
| 532 | } | ||
| 533 | |||
| 534 | /* Stop the ADC */ | ||
| 535 | return configure_adc(0); | ||
| 536 | } | ||
| 537 | |||
| 538 | #define DRIVER_NAME "msic_thermal" | ||
| 539 | |||
| 540 | static const struct platform_device_id therm_id_table[] = { | ||
| 541 | { DRIVER_NAME, 1 }, | ||
| 542 | { } | ||
| 543 | }; | ||
| 544 | MODULE_DEVICE_TABLE(platform, therm_id_table); | ||
| 545 | |||
| 546 | static struct platform_driver mid_thermal_driver = { | ||
| 547 | .driver = { | ||
| 548 | .name = DRIVER_NAME, | ||
| 549 | .pm = &mid_thermal_pm, | ||
| 550 | }, | ||
| 551 | .probe = mid_thermal_probe, | ||
| 552 | .remove = mid_thermal_remove, | ||
| 553 | .id_table = therm_id_table, | ||
| 554 | }; | ||
| 555 | |||
| 556 | module_platform_driver(mid_thermal_driver); | ||
| 557 | |||
| 558 | MODULE_AUTHOR("Durgadoss R <durgadoss.r@intel.com>"); | ||
| 559 | MODULE_DESCRIPTION("Intel Medfield Platform Thermal Driver"); | ||
| 560 | MODULE_LICENSE("GPL v2"); | ||
| @@ -75,7 +75,7 @@ struct intel_scu_ipc_dev { · 74 unmodified lines | |||
| 75 | #define IPC_READ_BUFFER 0x90 | 75 | #define IPC_READ_BUFFER 0x90 |
| 76 | 76 | ||
| 77 | /* Timeout in jiffies */ | 77 | /* Timeout in jiffies */ |
| 78 | #define IPC_TIMEOUT (3 * HZ) | 78 | #define IPC_TIMEOUT (5 * HZ) |
| 79 | 79 | ||
| 80 | static struct intel_scu_ipc_dev *ipcdev; /* Only one for now */ | 80 | static struct intel_scu_ipc_dev *ipcdev; /* Only one for now */ |
| 81 | static DEFINE_MUTEX(ipclock); /* lock used to prevent multiple call to SCU */ | 81 | static DEFINE_MUTEX(ipclock); /* lock used to prevent multiple call to SCU */ |
| @@ -11,8 +11,9 @@ · 10 unmodified lines | |||
| 11 | #include <linux/platform_device.h> | 11 | #include <linux/platform_device.h> |
| 12 | #include <linux/platform_data/intel-mid_wdt.h> | 12 | #include <linux/platform_data/intel-mid_wdt.h> |
| 13 | 13 | ||
| 14 | #include <asm/cpu_device_id.h> | ||
| 15 | #include <asm/intel-family.h> | ||
| 14 | #include <asm/intel-mid.h> | 16 | #include <asm/intel-mid.h> |
| 15 | #include <asm/intel_scu_ipc.h> | ||
| 16 | #include <asm/io_apic.h> | 17 | #include <asm/io_apic.h> |
| 17 | #include <asm/hw_irq.h> | 18 | #include <asm/hw_irq.h> |
| 18 | 19 | ||
| @@ -49,34 +50,26 @@ static struct intel_mid_wdt_pdata tangier_pdata = { · 30 unmodified lines | |||
| 49 | .probe = tangier_probe, | 50 | .probe = tangier_probe, |
| 50 | }; | 51 | }; |
| 51 | 52 | ||
| 52 | static int wdt_scu_status_change(struct notifier_block *nb, | 53 | static const struct x86_cpu_id intel_mid_cpu_ids[] = { |
| 53 | unsigned long code, void *data) | 54 | X86_MATCH_INTEL_FAM6_MODEL(ATOM_SILVERMONT_MID, &tangier_pdata), |
| 54 | { | 55 | {} |
| 55 | if (code == SCU_DOWN) { | ||
| 56 | platform_device_unregister(&wdt_dev); | ||
| 57 | return 0; | ||
| 58 | } | ||
| 59 | |||
| 60 | return platform_device_register(&wdt_dev); | ||
| 61 | } | ||
| 62 | |||
| 63 | static struct notifier_block wdt_scu_notifier = { | ||
| 64 | .notifier_call = wdt_scu_status_change, | ||
| 65 | }; | 56 | }; |
| 66 | 57 | ||
| 67 | static int __init register_mid_wdt(void) | 58 | static int __init register_mid_wdt(void) |
| 68 | { | 59 | { |
| 69 | if (intel_mid_identify_cpu() != INTEL_MID_CPU_CHIP_TANGIER) | 60 | const struct x86_cpu_id *id; |
| 70 | return -ENODEV; | ||
| 71 | 61 | ||
| 72 | wdt_dev.dev.platform_data = &tangier_pdata; | 62 | id = x86_match_cpu(intel_mid_cpu_ids); |
| 73 | 63 | if (!id) | |
| 74 | /* | 64 | return -ENODEV; |
| 75 | * We need to be sure that the SCU IPC is ready before watchdog device | ||
| 76 | * can be registered: | ||
| 77 | */ | ||
| 78 | intel_scu_notifier_add(&wdt_scu_notifier); | ||
| 79 | 65 | ||
| 80 | return 0; | 66 | wdt_dev.dev.platform_data = (struct intel_mid_wdt_pdata *)id->driver_data; |
| 67 | return platform_device_register(&wdt_dev); | ||
| 81 | } | 68 | } |
| 82 | arch_initcall(register_mid_wdt); | 69 | arch_initcall(register_mid_wdt); |
| 70 | |||
| 71 | static void __exit unregister_mid_wdt(void) | ||
| 72 | { | ||
| 73 | platform_device_unregister(&wdt_dev); | ||
| 74 | } | ||
| 75 | __exitcall(unregister_mid_wdt); | ||
| @@ -96,6 +96,8 @@ static int msi_wmi_query_block(int instance, int *ret) · 95 unmodified lines | |||
| 96 | struct acpi_buffer output = { ACPI_ALLOCATE_BUFFER, NULL }; | 96 | struct acpi_buffer output = { ACPI_ALLOCATE_BUFFER, NULL }; |
| 97 | 97 | ||
| 98 | status = wmi_query_block(MSIWMI_BIOS_GUID, instance, &output); | 98 | status = wmi_query_block(MSIWMI_BIOS_GUID, instance, &output); |
| 99 | if (ACPI_FAILURE(status)) | ||
| 100 | return -EIO; | ||
| 99 | 101 | ||
| 100 | obj = output.pointer; | 102 | obj = output.pointer; |
| 101 | 103 | ||
| @@ -66,6 +66,7 @@ · 65 unmodified lines | |||
| 66 | #include <linux/acpi.h> | 66 | #include <linux/acpi.h> |
| 67 | #include <linux/pci.h> | 67 | #include <linux/pci.h> |
| 68 | #include <linux/power_supply.h> | 68 | #include <linux/power_supply.h> |
| 69 | #include <linux/platform_profile.h> | ||
| 69 | #include <sound/core.h> | 70 | #include <sound/core.h> |
| 70 | #include <sound/control.h> | 71 | #include <sound/control.h> |
| 71 | #include <sound/initval.h> | 72 | #include <sound/initval.h> |
| @@ -9855,16 +9856,27 @@ static bool has_lapsensor; · 9783 unmodified lines | |||
| 9855 | static bool palm_state; | 9856 | static bool palm_state; |
| 9856 | static bool lap_state; | 9857 | static bool lap_state; |
| 9857 | 9858 | ||
| 9858 | static int lapsensor_get(bool *present, bool *state) | 9859 | static int dytc_command(int command, int *output) |
| 9859 | { | 9860 | { |
| 9860 | acpi_handle dytc_handle; | 9861 | acpi_handle dytc_handle; |
| 9861 | int output; | ||
| 9862 | 9862 | ||
| 9863 | *present = false; | 9863 | if (ACPI_FAILURE(acpi_get_handle(hkey_handle, "DYTC", &dytc_handle))) { |
| 9864 | if (ACPI_FAILURE(acpi_get_handle(hkey_handle, "DYTC", &dytc_handle))) | 9864 | /* Platform doesn't support DYTC */ |
| 9865 | return -ENODEV; | 9865 | return -ENODEV; |
| 9866 | if (!acpi_evalf(dytc_handle, &output, NULL, "dd", DYTC_CMD_GET)) | 9866 | } |
| 9867 | if (!acpi_evalf(dytc_handle, output, NULL, "dd", command)) | ||
| 9867 | return -EIO; | 9868 | return -EIO; |
| 9869 | return 0; | ||
| 9870 | } | ||
| 9871 | |||
| 9872 | static int lapsensor_get(bool *present, bool *state) | ||
| 9873 | { | ||
| 9874 | int output, err; | ||
| 9875 | |||
| 9876 | *present = false; | ||
| 9877 | err = dytc_command(DYTC_CMD_GET, &output); | ||
| 9878 | if (err) | ||
| 9879 | return err; | ||
| 9868 | 9880 | ||
| 9869 | *present = true; /*If we get his far, we have lapmode support*/ | 9881 | *present = true; /*If we get his far, we have lapmode support*/ |
| 9870 | *state = output & BIT(DYTC_GET_LAPMODE_BIT) ? true : false; | 9882 | *state = output & BIT(DYTC_GET_LAPMODE_BIT) ? true : false; |
| @@ -9983,6 +9995,434 @@ static struct ibm_struct proxsensor_driver_data = { · 112 unmodified lines | |||
| 9983 | .exit = proxsensor_exit, | 9995 | .exit = proxsensor_exit, |
| 9984 | }; | 9996 | }; |
| 9985 | 9997 | ||
| 9998 | /************************************************************************* | ||
| 9999 | * DYTC Platform Profile interface | ||
| 10000 | */ | ||
| 10001 | |||
| 10002 | #define DYTC_CMD_QUERY 0 /* To get DYTC status - enable/revision */ | ||
| 10003 | #define DYTC_CMD_SET 1 /* To enable/disable IC function mode */ | ||
| 10004 | #define DYTC_CMD_RESET 0x1ff /* To reset back to default */ | ||
| 10005 | |||
| 10006 | #define DYTC_QUERY_ENABLE_BIT 8 /* Bit 8 - 0 = disabled, 1 = enabled */ | ||
| 10007 | #define DYTC_QUERY_SUBREV_BIT 16 /* Bits 16 - 27 - sub revision */ | ||
| 10008 | #define DYTC_QUERY_REV_BIT 28 /* Bits 28 - 31 - revision */ | ||
| 10009 | |||
| 10010 | #define DYTC_GET_FUNCTION_BIT 8 /* Bits 8-11 - function setting */ | ||
| 10011 | #define DYTC_GET_MODE_BIT 12 /* Bits 12-15 - mode setting */ | ||
| 10012 | |||
| 10013 | #define DYTC_SET_FUNCTION_BIT 12 /* Bits 12-15 - function setting */ | ||
| 10014 | #define DYTC_SET_MODE_BIT 16 /* Bits 16-19 - mode setting */ | ||
| 10015 | #define DYTC_SET_VALID_BIT 20 /* Bit 20 - 1 = on, 0 = off */ | ||
| 10016 | |||
| 10017 | #define DYTC_FUNCTION_STD 0 /* Function = 0, standard mode */ | ||
| 10018 | #define DYTC_FUNCTION_CQL 1 /* Function = 1, lap mode */ | ||
| 10019 | #define DYTC_FUNCTION_MMC 11 /* Function = 11, desk mode */ | ||
| 10020 | |||
| 10021 | #define DYTC_MODE_PERFORM 2 /* High power mode aka performance */ | ||
| 10022 | #define DYTC_MODE_LOWPOWER 3 /* Low power mode */ | ||
| 10023 | #define DYTC_MODE_BALANCE 0xF /* Default mode aka balanced */ | ||
| 10024 | |||
| 10025 | #define DYTC_SET_COMMAND(function, mode, on) \ | ||
| 10026 | (DYTC_CMD_SET | (function) << DYTC_SET_FUNCTION_BIT | \ | ||
| 10027 | (mode) << DYTC_SET_MODE_BIT | \ | ||
| 10028 | (on) << DYTC_SET_VALID_BIT) | ||
| 10029 | |||
| 10030 | #define DYTC_DISABLE_CQL DYTC_SET_COMMAND(DYTC_FUNCTION_CQL, DYTC_MODE_BALANCE, 0) | ||
| 10031 | |||
| 10032 | #define DYTC_ENABLE_CQL DYTC_SET_COMMAND(DYTC_FUNCTION_CQL, DYTC_MODE_BALANCE, 1) | ||
| 10033 | |||
| 10034 | static bool dytc_profile_available; | ||
| 10035 | static enum platform_profile_option dytc_current_profile; | ||
| 10036 | static atomic_t dytc_ignore_event = ATOMIC_INIT(0); | ||
| 10037 | static DEFINE_MUTEX(dytc_mutex); | ||
| 10038 | |||
| 10039 | static int convert_dytc_to_profile(int dytcmode, enum platform_profile_option *profile) | ||
| 10040 | { | ||
| 10041 | switch (dytcmode) { | ||
| 10042 | case DYTC_MODE_LOWPOWER: | ||
| 10043 | *profile = PLATFORM_PROFILE_LOW_POWER; | ||
| 10044 | break; | ||
| 10045 | case DYTC_MODE_BALANCE: | ||
| 10046 | *profile = PLATFORM_PROFILE_BALANCED; | ||
| 10047 | break; | ||
| 10048 | case DYTC_MODE_PERFORM: | ||
| 10049 | *profile = PLATFORM_PROFILE_PERFORMANCE; | ||
| 10050 | break; | ||
| 10051 | default: /* Unknown mode */ | ||
| 10052 | return -EINVAL; | ||
| 10053 | } | ||
| 10054 | return 0; | ||
| 10055 | } | ||
| 10056 | |||
| 10057 | static int convert_profile_to_dytc(enum platform_profile_option profile, int *perfmode) | ||
| 10058 | { | ||
| 10059 | switch (profile) { | ||
| 10060 | case PLATFORM_PROFILE_LOW_POWER: | ||
| 10061 | *perfmode = DYTC_MODE_LOWPOWER; | ||
| 10062 | break; | ||
| 10063 | case PLATFORM_PROFILE_BALANCED: | ||
| 10064 | *perfmode = DYTC_MODE_BALANCE; | ||
| 10065 | break; | ||
| 10066 | case PLATFORM_PROFILE_PERFORMANCE: | ||
| 10067 | *perfmode = DYTC_MODE_PERFORM; | ||
| 10068 | break; | ||
| 10069 | default: /* Unknown profile */ | ||
| 10070 | return -EOPNOTSUPP; | ||
| 10071 | } | ||
| 10072 | return 0; | ||
| 10073 | } | ||
| 10074 | |||
| 10075 | /* | ||
| 10076 | * dytc_profile_get: Function to register with platform_profile | ||
| 10077 | * handler. Returns current platform profile. | ||
| 10078 | */ | ||
| 10079 | static int dytc_profile_get(struct platform_profile_handler *pprof, | ||
| 10080 | enum platform_profile_option *profile) | ||
| 10081 | { | ||
| 10082 | *profile = dytc_current_profile; | ||
| 10083 | return 0; | ||
| 10084 | } | ||
| 10085 | |||
| 10086 | /* | ||
| 10087 | * Helper function - check if we are in CQL mode and if we are | ||
| 10088 | * - disable CQL, | ||
| 10089 | * - run the command | ||
| 10090 | * - enable CQL | ||
| 10091 | * If not in CQL mode, just run the command | ||
| 10092 | */ | ||
| 10093 | static int dytc_cql_command(int command, int *output) | ||
| 10094 | { | ||
| 10095 | int err, cmd_err, dummy; | ||
| 10096 | int cur_funcmode; | ||
| 10097 | |||
| 10098 | /* Determine if we are in CQL mode. This alters the commands we do */ | ||
| 10099 | err = dytc_command(DYTC_CMD_GET, output); | ||
| 10100 | if (err) | ||
| 10101 | return err; | ||
| 10102 | |||
| 10103 | cur_funcmode = (*output >> DYTC_GET_FUNCTION_BIT) & 0xF; | ||
| 10104 | /* Check if we're OK to return immediately */ | ||
| 10105 | if ((command == DYTC_CMD_GET) && (cur_funcmode != DYTC_FUNCTION_CQL)) | ||
| 10106 | return 0; | ||
| 10107 | |||
| 10108 | if (cur_funcmode == DYTC_FUNCTION_CQL) { | ||
| 10109 | atomic_inc(&dytc_ignore_event); | ||
| 10110 | err = dytc_command(DYTC_DISABLE_CQL, &dummy); | ||
| 10111 | if (err) | ||
| 10112 | return err; | ||
| 10113 | } | ||
| 10114 | |||
| 10115 | cmd_err = dytc_command(command, output); | ||
| 10116 | /* Check return condition after we've restored CQL state */ | ||
| 10117 | |||
| 10118 | if (cur_funcmode == DYTC_FUNCTION_CQL) { | ||
| 10119 | err = dytc_command(DYTC_ENABLE_CQL, &dummy); | ||
| 10120 | if (err) | ||
| 10121 | return err; | ||
| 10122 | } | ||
| 10123 | |||
| 10124 | return cmd_err; | ||
| 10125 | } | ||
| 10126 | |||
| 10127 | /* | ||
| 10128 | * dytc_profile_set: Function to register with platform_profile | ||
| 10129 | * handler. Sets current platform profile. | ||
| 10130 | */ | ||
| 10131 | static int dytc_profile_set(struct platform_profile_handler *pprof, | ||
| 10132 | enum platform_profile_option profile) | ||
| 10133 | { | ||
| 10134 | int output; | ||
| 10135 | int err; | ||
| 10136 | |||
| 10137 | if (!dytc_profile_available) | ||
| 10138 | return -ENODEV; | ||
| 10139 | |||
| 10140 | err = mutex_lock_interruptible(&dytc_mutex); | ||
| 10141 | if (err) | ||
| 10142 | return err; | ||
| 10143 | |||
| 10144 | if (profile == PLATFORM_PROFILE_BALANCED) { | ||
| 10145 | /* To get back to balanced mode we just issue a reset command */ | ||
| 10146 | err = dytc_command(DYTC_CMD_RESET, &output); | ||
| 10147 | if (err) | ||
| 10148 | goto unlock; | ||
| 10149 | } else { | ||
| 10150 | int perfmode; | ||
| 10151 | |||
| 10152 | err = convert_profile_to_dytc(profile, &perfmode); | ||
| 10153 | if (err) | ||
| 10154 | goto unlock; | ||
| 10155 | |||
| 10156 | /* Determine if we are in CQL mode. This alters the commands we do */ | ||
| 10157 | err = dytc_cql_command(DYTC_SET_COMMAND(DYTC_FUNCTION_MMC, perfmode, 1), &output); | ||
| 10158 | if (err) | ||
| 10159 | goto unlock; | ||
| 10160 | } | ||
| 10161 | /* Success - update current profile */ | ||
| 10162 | dytc_current_profile = profile; | ||
| 10163 | unlock: | ||
| 10164 | mutex_unlock(&dytc_mutex); | ||
| 10165 | return err; | ||
| 10166 | } | ||
| 10167 | |||
| 10168 | static void dytc_profile_refresh(void) | ||
| 10169 | { | ||
| 10170 | enum platform_profile_option profile; | ||
| 10171 | int output, err; | ||
| 10172 | int perfmode; | ||
| 10173 | |||
| 10174 | mutex_lock(&dytc_mutex); | ||
| 10175 | err = dytc_cql_command(DYTC_CMD_GET, &output); | ||
| 10176 | mutex_unlock(&dytc_mutex); | ||
| 10177 | if (err) | ||
| 10178 | return; | ||
| 10179 | |||
| 10180 | perfmode = (output >> DYTC_GET_MODE_BIT) & 0xF; | ||
| 10181 | convert_dytc_to_profile(perfmode, &profile); | ||
| 10182 | if (profile != dytc_current_profile) { | ||
| 10183 | dytc_current_profile = profile; | ||
| 10184 | platform_profile_notify(); | ||
| 10185 | } | ||
| 10186 | } | ||
| 10187 | |||
| 10188 | static struct platform_profile_handler dytc_profile = { | ||
| 10189 | .profile_get = dytc_profile_get, | ||
| 10190 | .profile_set = dytc_profile_set, | ||
| 10191 | }; | ||
| 10192 | |||
| 10193 | static int tpacpi_dytc_profile_init(struct ibm_init_struct *iibm) | ||
| 10194 | { | ||
| 10195 | int err, output; | ||
| 10196 | |||
| 10197 | /* Setup supported modes */ | ||
| 10198 | set_bit(PLATFORM_PROFILE_LOW_POWER, dytc_profile.choices); | ||
| 10199 | set_bit(PLATFORM_PROFILE_BALANCED, dytc_profile.choices); | ||
| 10200 | set_bit(PLATFORM_PROFILE_PERFORMANCE, dytc_profile.choices); | ||
| 10201 | |||
| 10202 | dytc_profile_available = false; | ||
| 10203 | err = dytc_command(DYTC_CMD_QUERY, &output); | ||
| 10204 | /* | ||
| 10205 | * If support isn't available (ENODEV) then don't return an error | ||
| 10206 | * and don't create the sysfs group | ||
| 10207 | */ | ||
| 10208 | if (err == -ENODEV) | ||
| 10209 | return 0; | ||
| 10210 | /* For all other errors we can flag the failure */ | ||
| 10211 | if (err) | ||
| 10212 | return err; | ||
| 10213 | |||
| 10214 | /* Check DYTC is enabled and supports mode setting */ | ||
| 10215 | if (output & BIT(DYTC_QUERY_ENABLE_BIT)) { | ||
| 10216 | /* Only DYTC v5.0 and later has this feature. */ | ||
| 10217 | int dytc_version; | ||
| 10218 | |||
| 10219 | dytc_version = (output >> DYTC_QUERY_REV_BIT) & 0xF; | ||
| 10220 | if (dytc_version >= 5) { | ||
| 10221 | dbg_printk(TPACPI_DBG_INIT, | ||
| 10222 | "DYTC version %d: thermal mode available\n", dytc_version); | ||
| 10223 | /* Create platform_profile structure and register */ | ||
| 10224 | err = platform_profile_register(&dytc_profile); | ||
| 10225 | /* | ||
| 10226 | * If for some reason platform_profiles aren't enabled | ||
| 10227 | * don't quit terminally. | ||
| 10228 | */ | ||
| 10229 | if (err) | ||
| 10230 | return 0; | ||
| 10231 | |||
| 10232 | dytc_profile_available = true; | ||
| 10233 | /* Ensure initial values are correct */ | ||
| 10234 | dytc_profile_refresh(); | ||
| 10235 | } | ||
| 10236 | } | ||
| 10237 | return 0; | ||
| 10238 | } | ||
| 10239 | |||
| 10240 | static void dytc_profile_exit(void) | ||
| 10241 | { | ||
| 10242 | if (dytc_profile_available) { | ||
| 10243 | dytc_profile_available = false; | ||
| 10244 | platform_profile_remove(); | ||
| 10245 | } | ||
| 10246 | } | ||
| 10247 | |||
| 10248 | static struct ibm_struct dytc_profile_driver_data = { | ||
| 10249 | .name = "dytc-profile", | ||
| 10250 | .exit = dytc_profile_exit, | ||
| 10251 | }; | ||
| 10252 | |||
| 10253 | /************************************************************************* | ||
| 10254 | * Keyboard language interface | ||
| 10255 | */ | ||
| 10256 | |||
| 10257 | struct keyboard_lang_data { | ||
| 10258 | const char *lang_str; | ||
| 10259 | int lang_code; | ||
| 10260 | }; | ||
| 10261 | |||
| 10262 | static const struct keyboard_lang_data keyboard_lang_data[] = { | ||
| 10263 | {"be", 0x080c}, | ||
| 10264 | {"cz", 0x0405}, | ||
| 10265 | {"da", 0x0406}, | ||
| 10266 | {"de", 0x0c07}, | ||
| 10267 | {"en", 0x0000}, | ||
| 10268 | {"es", 0x2c0a}, | ||
| 10269 | {"et", 0x0425}, | ||
| 10270 | {"fr", 0x040c}, | ||
| 10271 | {"fr-ch", 0x100c}, | ||
| 10272 | {"hu", 0x040e}, | ||
| 10273 | {"it", 0x0410}, | ||
| 10274 | {"jp", 0x0411}, | ||
| 10275 | {"nl", 0x0413}, | ||
| 10276 | {"nn", 0x0414}, | ||
| 10277 | {"pl", 0x0415}, | ||
| 10278 | {"pt", 0x0816}, | ||
| 10279 | {"sl", 0x041b}, | ||
| 10280 | {"sv", 0x081d}, | ||
| 10281 | {"tr", 0x041f}, | ||
| 10282 | }; | ||
| 10283 | |||
| 10284 | static int set_keyboard_lang_command(int command) | ||
| 10285 | { | ||
| 10286 | acpi_handle sskl_handle; | ||
| 10287 | int output; | ||
| 10288 | |||
| 10289 | if (ACPI_FAILURE(acpi_get_handle(hkey_handle, "SSKL", &sskl_handle))) { | ||
| 10290 | /* Platform doesn't support SSKL */ | ||
| 10291 | return -ENODEV; | ||
| 10292 | } | ||
| 10293 | |||
| 10294 | if (!acpi_evalf(sskl_handle, &output, NULL, "dd", command)) | ||
| 10295 | return -EIO; | ||
| 10296 | |||
| 10297 | return 0; | ||
| 10298 | } | ||
| 10299 | |||
| 10300 | static int get_keyboard_lang(int *output) | ||
| 10301 | { | ||
| 10302 | acpi_handle gskl_handle; | ||
| 10303 | int kbd_lang; | ||
| 10304 | |||
| 10305 | if (ACPI_FAILURE(acpi_get_handle(hkey_handle, "GSKL", &gskl_handle))) { | ||
| 10306 | /* Platform doesn't support GSKL */ | ||
| 10307 | return -ENODEV; | ||
| 10308 | } | ||
| 10309 | |||
| 10310 | if (!acpi_evalf(gskl_handle, &kbd_lang, NULL, "dd", 0x02000000)) | ||
| 10311 | return -EIO; | ||
| 10312 | |||
| 10313 | /* | ||
| 10314 | * METHOD_ERR gets returned on devices where there are no special (e.g. '=', | ||
| 10315 | * '(' and ')') keys which use layout dependent key-press emulation. | ||
| 10316 | */ | ||
| 10317 | if (kbd_lang & METHOD_ERR) | ||
| 10318 | return -ENODEV; | ||
| 10319 | |||
| 10320 | *output = kbd_lang; | ||
| 10321 | |||
| 10322 | return 0; | ||
| 10323 | } | ||
| 10324 | |||
| 10325 | /* sysfs keyboard language entry */ | ||
| 10326 | static ssize_t keyboard_lang_show(struct device *dev, | ||
| 10327 | struct device_attribute *attr, | ||
| 10328 | char *buf) | ||
| 10329 | { | ||
| 10330 | int output, err, i, len = 0; | ||
| 10331 | |||
| 10332 | err = get_keyboard_lang(&output); | ||
| 10333 | if (err) | ||
| 10334 | return err; | ||
| 10335 | |||
| 10336 | for (i = 0; i < ARRAY_SIZE(keyboard_lang_data); i++) { | ||
| 10337 | if (i) | ||
| 10338 | len += sysfs_emit_at(buf, len, "%s", " "); | ||
| 10339 | |||
| 10340 | if (output == keyboard_lang_data[i].lang_code) { | ||
| 10341 | len += sysfs_emit_at(buf, len, "[%s]", keyboard_lang_data[i].lang_str); | ||
| 10342 | } else { | ||
| 10343 | len += sysfs_emit_at(buf, len, "%s", keyboard_lang_data[i].lang_str); | ||
| 10344 | } | ||
| 10345 | } | ||
| 10346 | len += sysfs_emit_at(buf, len, "\n"); | ||
| 10347 | |||
| 10348 | return len; | ||
| 10349 | } | ||
| 10350 | |||
| 10351 | static ssize_t keyboard_lang_store(struct device *dev, | ||
| 10352 | struct device_attribute *attr, | ||
| 10353 | const char *buf, size_t count) | ||
| 10354 | { | ||
| 10355 | int err, i; | ||
| 10356 | bool lang_found = false; | ||
| 10357 | int lang_code = 0; | ||
| 10358 | |||
| 10359 | for (i = 0; i < ARRAY_SIZE(keyboard_lang_data); i++) { | ||
| 10360 | if (sysfs_streq(buf, keyboard_lang_data[i].lang_str)) { | ||
| 10361 | lang_code = keyboard_lang_data[i].lang_code; | ||
| 10362 | lang_found = true; | ||
| 10363 | break; | ||
| 10364 | } | ||
| 10365 | } | ||
| 10366 | |||
| 10367 | if (lang_found) { | ||
| 10368 | lang_code = lang_code | 1 << 24; | ||
| 10369 | |||
| 10370 | /* Set language code */ | ||
| 10371 | err = set_keyboard_lang_command(lang_code); | ||
| 10372 | if (err) | ||
| 10373 | return err; | ||
| 10374 | } else { | ||
| 10375 | dev_err(&tpacpi_pdev->dev, "Unknown Keyboard language. Ignoring\n"); | ||
| 10376 | return -EINVAL; | ||
| 10377 | } | ||
| 10378 | |||
| 10379 | tpacpi_disclose_usertask(attr->attr.name, | ||
| 10380 | "keyboard language is set to %s\n", buf); | ||
| 10381 | |||
| 10382 | sysfs_notify(&tpacpi_pdev->dev.kobj, NULL, "keyboard_lang"); | ||
| 10383 | |||
| 10384 | return count; | ||
| 10385 | } | ||
| 10386 | static DEVICE_ATTR_RW(keyboard_lang); | ||
| 10387 | |||
| 10388 | static struct attribute *kbdlang_attributes[] = { | ||
| 10389 | &dev_attr_keyboard_lang.attr, | ||
| 10390 | NULL | ||
| 10391 | }; | ||
| 10392 | |||
| 10393 | static const struct attribute_group kbdlang_attr_group = { | ||
| 10394 | .attrs = kbdlang_attributes, | ||
| 10395 | }; | ||
| 10396 | |||
| 10397 | static int tpacpi_kbdlang_init(struct ibm_init_struct *iibm) | ||
| 10398 | { | ||
| 10399 | int err, output; | ||
| 10400 | |||
| 10401 | err = get_keyboard_lang(&output); | ||
| 10402 | /* | ||
| 10403 | * If support isn't available (ENODEV) then don't return an error | ||
| 10404 | * just don't create the sysfs group. | ||
| 10405 | */ | ||
| 10406 | if (err == -ENODEV) | ||
| 10407 | return 0; | ||
| 10408 | |||
| 10409 | if (err) | ||
| 10410 | return err; | ||
| 10411 | |||
| 10412 | /* Platform supports this feature - create the sysfs file */ | ||
| 10413 | return sysfs_create_group(&tpacpi_pdev->dev.kobj, &kbdlang_attr_group); | ||
| 10414 | } | ||
| 10415 | |||
| 10416 | static void kbdlang_exit(void) | ||
| 10417 | { | ||
| 10418 | sysfs_remove_group(&tpacpi_pdev->dev.kobj, &kbdlang_attr_group); | ||
| 10419 | } | ||
| 10420 | |||
| 10421 | static struct ibm_struct kbdlang_driver_data = { | ||
| 10422 | .name = "kbdlang", | ||
| 10423 | .exit = kbdlang_exit, | ||
| 10424 | }; | ||
| 10425 | |||
| 9986 | /**************************************************************************** | 10426 | /**************************************************************************** |
| 9987 | **************************************************************************** | 10427 | **************************************************************************** |
| 9988 | * | 10428 | * |
| @@ -10031,8 +10471,12 @@ static void tpacpi_driver_event(const unsigned int hkey_event) · 42 unmodified lines | |||
| 10031 | mutex_unlock(&kbdlight_mutex); | 10471 | mutex_unlock(&kbdlight_mutex); |
| 10032 | } | 10472 | } |
| 10033 | 10473 | ||
| 10034 | if (hkey_event == TP_HKEY_EV_THM_CSM_COMPLETED) | 10474 | if (hkey_event == TP_HKEY_EV_THM_CSM_COMPLETED) { |
| 10035 | lapsensor_refresh(); | 10475 | lapsensor_refresh(); |
| 10476 | /* If we are already accessing DYTC then skip dytc update */ | ||
| 10477 | if (!atomic_add_unless(&dytc_ignore_event, -1, 0)) | ||
| 10478 | dytc_profile_refresh(); | ||
| 10479 | } | ||
| 10036 | } | 10480 | } |
| 10037 | 10481 | ||
| 10038 | static void hotkey_driver_event(const unsigned int scancode) | 10482 | static void hotkey_driver_event(const unsigned int scancode) |
| @@ -10475,6 +10919,14 @@ static struct ibm_init_struct ibms_init[] __initdata = { · 436 unmodified lines | |||
| 10475 | .init = tpacpi_proxsensor_init, | 10919 | .init = tpacpi_proxsensor_init, |
| 10476 | .data = &proxsensor_driver_data, | 10920 | .data = &proxsensor_driver_data, |
| 10477 | }, | 10921 | }, |
| 10922 | { | ||
| 10923 | .init = tpacpi_dytc_profile_init, | ||
| 10924 | .data = &dytc_profile_driver_data, | ||
| 10925 | }, | ||
| 10926 | { | ||
| 10927 | .init = tpacpi_kbdlang_init, | ||
| 10928 | .data = &kbdlang_driver_data, | ||
| 10929 | }, | ||
| 10478 | }; | 10930 | }; |
| 10479 | 10931 | ||
| 10480 | static int __init set_ibm_param(const char *val, const struct kernel_param *kp) | 10932 | static int __init set_ibm_param(const char *val, const struct kernel_param *kp) |
| @@ -382,6 +382,23 @@ static const struct ts_dmi_data jumper_ezpad_6_m4_data = { · 381 unmodified lines | |||
| 382 | .properties = jumper_ezpad_6_m4_props, | 382 | .properties = jumper_ezpad_6_m4_props, |
| 383 | }; | 383 | }; |
| 384 | 384 | ||
| 385 | static const struct property_entry jumper_ezpad_7_props[] = { | ||
| 386 | PROPERTY_ENTRY_U32("touchscreen-min-x", 4), | ||
| 387 | PROPERTY_ENTRY_U32("touchscreen-min-y", 10), | ||
| 388 | PROPERTY_ENTRY_U32("touchscreen-size-x", 2044), | ||
| 389 | PROPERTY_ENTRY_U32("touchscreen-size-y", 1526), | ||
| 390 | PROPERTY_ENTRY_BOOL("touchscreen-swapped-x-y"), | ||
| 391 | PROPERTY_ENTRY_STRING("firmware-name", "gsl3680-jumper-ezpad-7.fw"), | ||
| 392 | PROPERTY_ENTRY_U32("silead,max-fingers", 10), | ||
| 393 | PROPERTY_ENTRY_BOOL("silead,stuck-controller-bug"), | ||
| 394 | { } | ||
| 395 | }; | ||
| 396 | |||
| 397 | static const struct ts_dmi_data jumper_ezpad_7_data = { | ||
| 398 | .acpi_name = "MSSL1680:00", | ||
| 399 | .properties = jumper_ezpad_7_props, | ||
| 400 | }; | ||
| 401 | |||
| 385 | static const struct property_entry jumper_ezpad_mini3_props[] = { | 402 | static const struct property_entry jumper_ezpad_mini3_props[] = { |
| 386 | PROPERTY_ENTRY_U32("touchscreen-min-x", 23), | 403 | PROPERTY_ENTRY_U32("touchscreen-min-x", 23), |
| 387 | PROPERTY_ENTRY_U32("touchscreen-min-y", 16), | 404 | PROPERTY_ENTRY_U32("touchscreen-min-y", 16), |
| @@ -1034,6 +1051,16 @@ const struct dmi_system_id touchscreen_dmi_table[] = { · 646 unmodified lines | |||
| 1034 | DMI_MATCH(DMI_BIOS_VERSION, "Jumper8.S106x"), | 1051 | DMI_MATCH(DMI_BIOS_VERSION, "Jumper8.S106x"), |
| 1035 | }, | 1052 | }, |
| 1036 | }, | 1053 | }, |
| 1054 | { | ||
| 1055 | /* Jumper EZpad 7 */ | ||
| 1056 | .driver_data = (void *)&jumper_ezpad_7_data, | ||
| 1057 | .matches = { | ||
| 1058 | DMI_MATCH(DMI_SYS_VENDOR, "Jumper"), | ||
| 1059 | DMI_MATCH(DMI_PRODUCT_NAME, "EZpad"), | ||
| 1060 | /* Jumper12x.WJ2012.bsBKRCP05 with the version dropped */ | ||
| 1061 | DMI_MATCH(DMI_BIOS_VERSION, "Jumper12x.WJ2012.bsBKRCP"), | ||
| 1062 | }, | ||
| 1063 | }, | ||
| 1037 | { | 1064 | { |
| 1038 | /* Jumper EZpad mini3 */ | 1065 | /* Jumper EZpad mini3 */ |
| 1039 | .driver_data = (void *)&jumper_ezpad_mini3_data, | 1066 | .driver_data = (void *)&jumper_ezpad_mini3_data, |
| @@ -973,18 +973,6 @@ config RTC_DRV_ALPHA · 972 unmodified lines | |||
| 973 | Direct support for the real-time clock found on every Alpha | 973 | Direct support for the real-time clock found on every Alpha |
| 974 | system, specifically MC146818 compatibles. If in doubt, say Y. | 974 | system, specifically MC146818 compatibles. If in doubt, say Y. |
| 975 | 975 | ||
| 976 | config RTC_DRV_VRTC | ||
| 977 | tristate "Virtual RTC for Intel MID platforms" | ||
| 978 | depends on X86_INTEL_MID | ||
| 979 | default y if X86_INTEL_MID | ||
| 980 | |||
| 981 | help | ||
| 982 | Say "yes" here to get direct support for the real time clock | ||
| 983 | found on Moorestown platforms. The VRTC is a emulated RTC that | ||
| 984 | derives its clock source from a real RTC in the PMIC. The MC146818 | ||
| 985 | style programming interface is mostly conserved, but any | ||
| 986 | updates are done via IPC calls to the system controller FW. | ||
| 987 | |||
| 988 | config RTC_DRV_DS1216 | 976 | config RTC_DRV_DS1216 |
| 989 | tristate "Dallas DS1216" | 977 | tristate "Dallas DS1216" |
| 990 | depends on SNI_RM | 978 | depends on SNI_RM |
| @@ -174,7 +174,6 @@ obj-$(CONFIG_RTC_DRV_TWL4030) += rtc-twl.o · 173 unmodified lines | |||
| 174 | obj-$(CONFIG_RTC_DRV_TX4939) += rtc-tx4939.o | 174 | obj-$(CONFIG_RTC_DRV_TX4939) += rtc-tx4939.o |
| 175 | obj-$(CONFIG_RTC_DRV_V3020) += rtc-v3020.o | 175 | obj-$(CONFIG_RTC_DRV_V3020) += rtc-v3020.o |
| 176 | obj-$(CONFIG_RTC_DRV_VR41XX) += rtc-vr41xx.o | 176 | obj-$(CONFIG_RTC_DRV_VR41XX) += rtc-vr41xx.o |
| 177 | obj-$(CONFIG_RTC_DRV_VRTC) += rtc-mrst.o | ||
| 178 | obj-$(CONFIG_RTC_DRV_VT8500) += rtc-vt8500.o | 177 | obj-$(CONFIG_RTC_DRV_VT8500) += rtc-vt8500.o |
| 179 | obj-$(CONFIG_RTC_DRV_WILCO_EC) += rtc-wilco-ec.o | 178 | obj-$(CONFIG_RTC_DRV_WILCO_EC) += rtc-wilco-ec.o |
| 180 | obj-$(CONFIG_RTC_DRV_WM831X) += rtc-wm831x.o | 179 | obj-$(CONFIG_RTC_DRV_WM831X) += rtc-wm831x.o |
| @@ -1,521 +0,0 @@ | |||
| 1 | // SPDX-License-Identifier: GPL-2.0-only | ||
| 2 | /* | ||
| 3 | * rtc-mrst.c: Driver for Moorestown virtual RTC | ||
| 4 | * | ||
| 5 | * (C) Copyright 2009 Intel Corporation | ||
| 6 | * Author: Jacob Pan (jacob.jun.pan@intel.com) | ||
| 7 | * Feng Tang (feng.tang@intel.com) | ||
| 8 | * | ||
| 9 | * Note: | ||
| 10 | * VRTC is emulated by system controller firmware, the real HW | ||
| 11 | * RTC is located in the PMIC device. SCU FW shadows PMIC RTC | ||
| 12 | * in a memory mapped IO space that is visible to the host IA | ||
| 13 | * processor. | ||
| 14 | * | ||
| 15 | * This driver is based upon drivers/rtc/rtc-cmos.c | ||
| 16 | */ | ||
| 17 | |||
| 18 | /* | ||
| 19 | * Note: | ||
| 20 | * * vRTC only supports binary mode and 24H mode | ||
| 21 | * * vRTC only support PIE and AIE, no UIE, and its PIE only happens | ||
| 22 | * at 23:59:59pm everyday, no support for adjustable frequency | ||
| 23 | * * Alarm function is also limited to hr/min/sec. | ||
| 24 | */ | ||
| 25 | |||
| 26 | #include <linux/mod_devicetable.h> | ||
| 27 | #include <linux/platform_device.h> | ||
| 28 | #include <linux/interrupt.h> | ||
| 29 | #include <linux/spinlock.h> | ||
| 30 | #include <linux/kernel.h> | ||
| 31 | #include <linux/mc146818rtc.h> | ||
| 32 | #include <linux/module.h> | ||
| 33 | #include <linux/init.h> | ||
| 34 | #include <linux/sfi.h> | ||
| 35 | |||
| 36 | #include <asm/intel_scu_ipc.h> | ||
| 37 | #include <asm/intel-mid.h> | ||
| 38 | #include <asm/intel_mid_vrtc.h> | ||
| 39 | |||
| 40 | struct mrst_rtc { | ||
| 41 | struct rtc_device *rtc; | ||
| 42 | struct device *dev; | ||
| 43 | int irq; | ||
| 44 | |||
| 45 | u8 enabled_wake; | ||
| 46 | u8 suspend_ctrl; | ||
| 47 | }; | ||
| 48 | |||
| 49 | static const char driver_name[] = "rtc_mrst"; | ||
| 50 | |||
| 51 | #define RTC_IRQMASK (RTC_PF | RTC_AF) | ||
| 52 | |||
| 53 | static inline int is_intr(u8 rtc_intr) | ||
| 54 | { | ||
| 55 | if (!(rtc_intr & RTC_IRQF)) | ||
| 56 | return 0; | ||
| 57 | return rtc_intr & RTC_IRQMASK; | ||
| 58 | } | ||
| 59 | |||
| 60 | static inline unsigned char vrtc_is_updating(void) | ||
| 61 | { | ||
| 62 | unsigned char uip; | ||
| 63 | unsigned long flags; | ||
| 64 | |||
| 65 | spin_lock_irqsave(&rtc_lock, flags); | ||
| 66 | uip = (vrtc_cmos_read(RTC_FREQ_SELECT) & RTC_UIP); | ||
| 67 | spin_unlock_irqrestore(&rtc_lock, flags); | ||
| 68 | return uip; | ||
| 69 | } | ||
| 70 | |||
| 71 | /* | ||
| 72 | * rtc_time's year contains the increment over 1900, but vRTC's YEAR | ||
| 73 | * register can't be programmed to value larger than 0x64, so vRTC | ||
| 74 | * driver chose to use 1972 (1970 is UNIX time start point) as the base, | ||
| 75 | * and does the translation at read/write time. | ||
| 76 | * | ||
| 77 | * Why not just use 1970 as the offset? it's because using 1972 will | ||
| 78 | * make it consistent in leap year setting for both vrtc and low-level | ||
| 79 | * physical rtc devices. Then why not use 1960 as the offset? If we use | ||
| 80 | * 1960, for a device's first use, its YEAR register is 0 and the system | ||
| 81 | * year will be parsed as 1960 which is not a valid UNIX time and will | ||
| 82 | * cause many applications to fail mysteriously. | ||
| 83 | */ | ||
| 84 | static int mrst_read_time(struct device *dev, struct rtc_time *time) | ||
| 85 | { | ||
| 86 | unsigned long flags; | ||
| 87 | |||
| 88 | if (vrtc_is_updating()) | ||
| 89 | msleep(20); | ||
| 90 | |||
| 91 | spin_lock_irqsave(&rtc_lock, flags); | ||
| 92 | time->tm_sec = vrtc_cmos_read(RTC_SECONDS); | ||
| 93 | time->tm_min = vrtc_cmos_read(RTC_MINUTES); | ||
| 94 | time->tm_hour = vrtc_cmos_read(RTC_HOURS); | ||
| 95 | time->tm_mday = vrtc_cmos_read(RTC_DAY_OF_MONTH); | ||
| 96 | time->tm_mon = vrtc_cmos_read(RTC_MONTH); | ||
| 97 | time->tm_year = vrtc_cmos_read(RTC_YEAR); | ||
| 98 | spin_unlock_irqrestore(&rtc_lock, flags); | ||
| 99 | |||
| 100 | /* Adjust for the 1972/1900 */ | ||
| 101 | time->tm_year += 72; | ||
| 102 | time->tm_mon--; | ||
| 103 | return 0; | ||
| 104 | } | ||
| 105 | |||
| 106 | static int mrst_set_time(struct device *dev, struct rtc_time *time) | ||
| 107 | { | ||
| 108 | int ret; | ||
| 109 | unsigned long flags; | ||
| 110 | unsigned char mon, day, hrs, min, sec; | ||
| 111 | unsigned int yrs; | ||
| 112 | |||
| 113 | yrs = time->tm_year; | ||
| 114 | mon = time->tm_mon + 1; /* tm_mon starts at zero */ | ||
| 115 | day = time->tm_mday; | ||
| 116 | hrs = time->tm_hour; | ||
| 117 | min = time->tm_min; | ||
| 118 | sec = time->tm_sec; | ||
| 119 | |||
| 120 | if (yrs < 72 || yrs > 172) | ||
| 121 | return -EINVAL; | ||
| 122 | yrs -= 72; | ||
| 123 | |||
| 124 | spin_lock_irqsave(&rtc_lock, flags); | ||
| 125 | |||
| 126 | vrtc_cmos_write(yrs, RTC_YEAR); | ||
| 127 | vrtc_cmos_write(mon, RTC_MONTH); | ||
| 128 | vrtc_cmos_write(day, RTC_DAY_OF_MONTH); | ||
| 129 | vrtc_cmos_write(hrs, RTC_HOURS); | ||
| 130 | vrtc_cmos_write(min, RTC_MINUTES); | ||
| 131 | vrtc_cmos_write(sec, RTC_SECONDS); | ||
| 132 | |||
| 133 | spin_unlock_irqrestore(&rtc_lock, flags); | ||
| 134 | |||
| 135 | ret = intel_scu_ipc_simple_command(IPCMSG_VRTC, IPC_CMD_VRTC_SETTIME); | ||
| 136 | return ret; | ||
| 137 | } | ||
| 138 | |||
| 139 | static int mrst_read_alarm(struct device *dev, struct rtc_wkalrm *t) | ||
| 140 | { | ||
| 141 | struct mrst_rtc *mrst = dev_get_drvdata(dev); | ||
| 142 | unsigned char rtc_control; | ||
| 143 | |||
| 144 | if (mrst->irq <= 0) | ||
| 145 | return -EIO; | ||
| 146 | |||
| 147 | /* vRTC only supports binary mode */ | ||
| 148 | spin_lock_irq(&rtc_lock); | ||
| 149 | t->time.tm_sec = vrtc_cmos_read(RTC_SECONDS_ALARM); | ||
| 150 | t->time.tm_min = vrtc_cmos_read(RTC_MINUTES_ALARM); | ||
| 151 | t->time.tm_hour = vrtc_cmos_read(RTC_HOURS_ALARM); | ||
| 152 | |||
| 153 | rtc_control = vrtc_cmos_read(RTC_CONTROL); | ||
| 154 | spin_unlock_irq(&rtc_lock); | ||
| 155 | |||
| 156 | t->enabled = !!(rtc_control & RTC_AIE); | ||
| 157 | t->pending = 0; | ||
| 158 | |||
| 159 | return 0; | ||
| 160 | } | ||
| 161 | |||
| 162 | static void mrst_checkintr(struct mrst_rtc *mrst, unsigned char rtc_control) | ||
| 163 | { | ||
| 164 | unsigned char rtc_intr; | ||
| 165 | |||
| 166 | /* | ||
| 167 | * NOTE after changing RTC_xIE bits we always read INTR_FLAGS; | ||
| 168 | * allegedly some older rtcs need that to handle irqs properly | ||
| 169 | */ | ||
| 170 | rtc_intr = vrtc_cmos_read(RTC_INTR_FLAGS); | ||
| 171 | rtc_intr &= (rtc_control & RTC_IRQMASK) | RTC_IRQF; | ||
| 172 | if (is_intr(rtc_intr)) | ||
| 173 | rtc_update_irq(mrst->rtc, 1, rtc_intr); | ||
| 174 | } | ||
| 175 | |||
| 176 | static void mrst_irq_enable(struct mrst_rtc *mrst, unsigned char mask) | ||
| 177 | { | ||
| 178 | unsigned char rtc_control; | ||
| 179 | |||
| 180 | /* | ||
| 181 | * Flush any pending IRQ status, notably for update irqs, | ||
| 182 | * before we enable new IRQs | ||
| 183 | */ | ||
| 184 | rtc_control = vrtc_cmos_read(RTC_CONTROL); | ||
| 185 | mrst_checkintr(mrst, rtc_control); | ||
| 186 | |||
| 187 | rtc_control |= mask; | ||
| 188 | vrtc_cmos_write(rtc_control, RTC_CONTROL); | ||
| 189 | |||
| 190 | mrst_checkintr(mrst, rtc_control); | ||
| 191 | } | ||
| 192 | |||
| 193 | static void mrst_irq_disable(struct mrst_rtc *mrst, unsigned char mask) | ||
| 194 | { | ||
| 195 | unsigned char rtc_control; | ||
| 196 | |||
| 197 | rtc_control = vrtc_cmos_read(RTC_CONTROL); | ||
| 198 | rtc_control &= ~mask; | ||
| 199 | vrtc_cmos_write(rtc_control, RTC_CONTROL); | ||
| 200 | mrst_checkintr(mrst, rtc_control); | ||
| 201 | } | ||
| 202 | |||
| 203 | static int mrst_set_alarm(struct device *dev, struct rtc_wkalrm *t) | ||
| 204 | { | ||
| 205 | struct mrst_rtc *mrst = dev_get_drvdata(dev); | ||
| 206 | unsigned char hrs, min, sec; | ||
| 207 | int ret = 0; | ||
| 208 | |||
| 209 | if (!mrst->irq) | ||
| 210 | return -EIO; | ||
| 211 | |||
| 212 | hrs = t->time.tm_hour; | ||
| 213 | min = t->time.tm_min; | ||
| 214 | sec = t->time.tm_sec; | ||
| 215 | |||
| 216 | spin_lock_irq(&rtc_lock); | ||
| 217 | /* Next rtc irq must not be from previous alarm setting */ | ||
| 218 | mrst_irq_disable(mrst, RTC_AIE); | ||
| 219 | |||
| 220 | /* Update alarm */ | ||
| 221 | vrtc_cmos_write(hrs, RTC_HOURS_ALARM); | ||
| 222 | vrtc_cmos_write(min, RTC_MINUTES_ALARM); | ||
| 223 | vrtc_cmos_write(sec, RTC_SECONDS_ALARM); | ||
| 224 | |||
| 225 | spin_unlock_irq(&rtc_lock); | ||
| 226 | |||
| 227 | ret = intel_scu_ipc_simple_command(IPCMSG_VRTC, IPC_CMD_VRTC_SETALARM); | ||
| 228 | if (ret) | ||
| 229 | return ret; | ||
| 230 | |||
| 231 | spin_lock_irq(&rtc_lock); | ||
| 232 | if (t->enabled) | ||
| 233 | mrst_irq_enable(mrst, RTC_AIE); | ||
| 234 | |||
| 235 | spin_unlock_irq(&rtc_lock); | ||
| 236 | |||
| 237 | return 0; | ||
| 238 | } | ||
| 239 | |||
| 240 | /* Currently, the vRTC doesn't support UIE ON/OFF */ | ||
| 241 | static int mrst_rtc_alarm_irq_enable(struct device *dev, unsigned int enabled) | ||
| 242 | { | ||
| 243 | struct mrst_rtc *mrst = dev_get_drvdata(dev); | ||
| 244 | unsigned long flags; | ||
| 245 | |||
| 246 | spin_lock_irqsave(&rtc_lock, flags); | ||
| 247 | if (enabled) | ||
| 248 | mrst_irq_enable(mrst, RTC_AIE); | ||
| 249 | else | ||
| 250 | mrst_irq_disable(mrst, RTC_AIE); | ||
| 251 | spin_unlock_irqrestore(&rtc_lock, flags); | ||
| 252 | return 0; | ||
| 253 | } | ||
| 254 | |||
| 255 | |||
| 256 | #if IS_ENABLED(CONFIG_RTC_INTF_PROC) | ||
| 257 | |||
| 258 | static int mrst_procfs(struct device *dev, struct seq_file *seq) | ||
| 259 | { | ||
| 260 | unsigned char rtc_control; | ||
| 261 | |||
| 262 | spin_lock_irq(&rtc_lock); | ||
| 263 | rtc_control = vrtc_cmos_read(RTC_CONTROL); | ||
| 264 | spin_unlock_irq(&rtc_lock); | ||
| 265 | |||
| 266 | seq_printf(seq, | ||
| 267 | "periodic_IRQ\t: %s\n" | ||
| 268 | "alarm\t\t: %s\n" | ||
| 269 | "BCD\t\t: no\n" | ||
| 270 | "periodic_freq\t: daily (not adjustable)\n", | ||
| 271 | (rtc_control & RTC_PIE) ? "on" : "off", | ||
| 272 | (rtc_control & RTC_AIE) ? "on" : "off"); | ||
| 273 | |||
| 274 | return 0; | ||
| 275 | } | ||
| 276 | |||
| 277 | #else | ||
| 278 | #define mrst_procfs NULL | ||
| 279 | #endif | ||
| 280 | |||
| 281 | static const struct rtc_class_ops mrst_rtc_ops = { | ||
| 282 | .read_time = mrst_read_time, | ||
| 283 | .set_time = mrst_set_time, | ||
| 284 | .read_alarm = mrst_read_alarm, | ||
| 285 | .set_alarm = mrst_set_alarm, | ||
| 286 | .proc = mrst_procfs, | ||
| 287 | .alarm_irq_enable = mrst_rtc_alarm_irq_enable, | ||
| 288 | }; | ||
| 289 | |||
| 290 | static struct mrst_rtc mrst_rtc; | ||
| 291 | |||
| 292 | /* | ||
| 293 | * When vRTC IRQ is captured by SCU FW, FW will clear the AIE bit in | ||
| 294 | * Reg B, so no need for this driver to clear it | ||
| 295 | */ | ||
| 296 | static irqreturn_t mrst_rtc_irq(int irq, void *p) | ||
| 297 | { | ||
| 298 | u8 irqstat; | ||
| 299 | |||
| 300 | spin_lock(&rtc_lock); | ||
| 301 | /* This read will clear all IRQ flags inside Reg C */ | ||
| 302 | irqstat = vrtc_cmos_read(RTC_INTR_FLAGS); | ||
| 303 | spin_unlock(&rtc_lock); | ||
| 304 | |||
| 305 | irqstat &= RTC_IRQMASK | RTC_IRQF; | ||
| 306 | if (is_intr(irqstat)) { | ||
| 307 | rtc_update_irq(p, 1, irqstat); | ||
| 308 | return IRQ_HANDLED; | ||
| 309 | } | ||
| 310 | return IRQ_NONE; | ||
| 311 | } | ||
| 312 | |||
| 313 | static int vrtc_mrst_do_probe(struct device *dev, struct resource *iomem, | ||
| 314 | int rtc_irq) | ||
| 315 | { | ||
| 316 | int retval = 0; | ||
| 317 | unsigned char rtc_control; | ||
| 318 | |||
| 319 | /* There can be only one ... */ | ||
| 320 | if (mrst_rtc.dev) | ||
| 321 | return -EBUSY; | ||
| 322 | |||
| 323 | if (!iomem) | ||
| 324 | return -ENODEV; | ||
| 325 | |||
| 326 | iomem = devm_request_mem_region(dev, iomem->start, resource_size(iomem), | ||
| 327 | driver_name); | ||
| 328 | if (!iomem) { | ||
| 329 | dev_dbg(dev, "i/o mem already in use.\n"); | ||
| 330 | return -EBUSY; | ||
| 331 | } | ||
| 332 | |||
| 333 | mrst_rtc.irq = rtc_irq; | ||
| 334 | mrst_rtc.dev = dev; | ||
| 335 | dev_set_drvdata(dev, &mrst_rtc); | ||
| 336 | |||
| 337 | mrst_rtc.rtc = devm_rtc_allocate_device(dev); | ||
| 338 | if (IS_ERR(mrst_rtc.rtc)) | ||
| 339 | return PTR_ERR(mrst_rtc.rtc); | ||
| 340 | |||
| 341 | mrst_rtc.rtc->ops = &mrst_rtc_ops; | ||
| 342 | |||
| 343 | rename_region(iomem, dev_name(&mrst_rtc.rtc->dev)); | ||
| 344 | |||
| 345 | spin_lock_irq(&rtc_lock); | ||
| 346 | mrst_irq_disable(&mrst_rtc, RTC_PIE | RTC_AIE); | ||
| 347 | rtc_control = vrtc_cmos_read(RTC_CONTROL); | ||
| 348 | spin_unlock_irq(&rtc_lock); | ||
| 349 | |||
| 350 | if (!(rtc_control & RTC_24H) || (rtc_control & (RTC_DM_BINARY))) | ||
| 351 | dev_dbg(dev, "TODO: support more than 24-hr BCD mode\n"); | ||
| 352 | |||
| 353 | if (rtc_irq) { | ||
| 354 | retval = devm_request_irq(dev, rtc_irq, mrst_rtc_irq, | ||
| 355 | 0, dev_name(&mrst_rtc.rtc->dev), | ||
| 356 | mrst_rtc.rtc); | ||
| 357 | if (retval < 0) { | ||
| 358 | dev_dbg(dev, "IRQ %d is already in use, err %d\n", | ||
| 359 | rtc_irq, retval); | ||
| 360 | goto cleanup0; | ||
| 361 | } | ||
| 362 | } | ||
| 363 | |||
| 364 | retval = devm_rtc_register_device(mrst_rtc.rtc); | ||
| 365 | if (retval) | ||
| 366 | goto cleanup0; | ||
| 367 | |||
| 368 | dev_dbg(dev, "initialised\n"); | ||
| 369 | return 0; | ||
| 370 | |||
| 371 | cleanup0: | ||
| 372 | mrst_rtc.dev = NULL; | ||
| 373 | dev_err(dev, "rtc-mrst: unable to initialise\n"); | ||
| 374 | return retval; | ||
| 375 | } | ||
| 376 | |||
| 377 | static void rtc_mrst_do_shutdown(void) | ||
| 378 | { | ||
| 379 | spin_lock_irq(&rtc_lock); | ||
| 380 | mrst_irq_disable(&mrst_rtc, RTC_IRQMASK); | ||
| 381 | spin_unlock_irq(&rtc_lock); | ||
| 382 | } | ||
| 383 | |||
| 384 | static void rtc_mrst_do_remove(struct device *dev) | ||
| 385 | { | ||
| 386 | struct mrst_rtc *mrst = dev_get_drvdata(dev); | ||
| 387 | |||
| 388 | rtc_mrst_do_shutdown(); | ||
| 389 | |||
| 390 | mrst->rtc = NULL; | ||
| 391 | mrst->dev = NULL; | ||
| 392 | } | ||
| 393 | |||
| 394 | #ifdef CONFIG_PM_SLEEP | ||
| 395 | static int mrst_suspend(struct device *dev) | ||
| 396 | { | ||
| 397 | struct mrst_rtc *mrst = dev_get_drvdata(dev); | ||
| 398 | unsigned char tmp; | ||
| 399 | |||
| 400 | /* Only the alarm might be a wakeup event source */ | ||
| 401 | spin_lock_irq(&rtc_lock); | ||
| 402 | mrst->suspend_ctrl = tmp = vrtc_cmos_read(RTC_CONTROL); | ||
| 403 | if (tmp & (RTC_PIE | RTC_AIE)) { | ||
| 404 | unsigned char mask; | ||
| 405 | |||
| 406 | if (device_may_wakeup(dev)) | ||
| 407 | mask = RTC_IRQMASK & ~RTC_AIE; | ||
| 408 | else | ||
| 409 | mask = RTC_IRQMASK; | ||
| 410 | tmp &= ~mask; | ||
| 411 | vrtc_cmos_write(tmp, RTC_CONTROL); | ||
| 412 | |||
| 413 | mrst_checkintr(mrst, tmp); | ||
| 414 | } | ||
| 415 | spin_unlock_irq(&rtc_lock); | ||
| 416 | |||
| 417 | if (tmp & RTC_AIE) { | ||
| 418 | mrst->enabled_wake = 1; | ||
| 419 | enable_irq_wake(mrst->irq); | ||
| 420 | } | ||
| 421 | |||
| 422 | dev_dbg(&mrst_rtc.rtc->dev, "suspend%s, ctrl %02x\n", | ||
| 423 | (tmp & RTC_AIE) ? ", alarm may wake" : "", | ||
| 424 | tmp); | ||
| 425 | |||
| 426 | return 0; | ||
| 427 | } | ||
| 428 | |||
| 429 | /* | ||
| 430 | * We want RTC alarms to wake us from the deep power saving state | ||
| 431 | */ | ||
| 432 | static inline int mrst_poweroff(struct device *dev) | ||
| 433 | { | ||
| 434 | return mrst_suspend(dev); | ||
| 435 | } | ||
| 436 | |||
| 437 | static int mrst_resume(struct device *dev) | ||
| 438 | { | ||
| 439 | struct mrst_rtc *mrst = dev_get_drvdata(dev); | ||
| 440 | unsigned char tmp = mrst->suspend_ctrl; | ||
| 441 | |||
| 442 | /* Re-enable any irqs previously active */ | ||
| 443 | if (tmp & RTC_IRQMASK) { | ||
| 444 | unsigned char mask; | ||
| 445 | |||
| 446 | if (mrst->enabled_wake) { | ||
| 447 | disable_irq_wake(mrst->irq); | ||
| 448 | mrst->enabled_wake = 0; | ||
| 449 | } | ||
| 450 | |||
| 451 | spin_lock_irq(&rtc_lock); | ||
| 452 | do { | ||
| 453 | vrtc_cmos_write(tmp, RTC_CONTROL); | ||
| 454 | |||
| 455 | mask = vrtc_cmos_read(RTC_INTR_FLAGS); | ||
| 456 | mask &= (tmp & RTC_IRQMASK) | RTC_IRQF; | ||
| 457 | if (!is_intr(mask)) | ||
| 458 | break; | ||
| 459 | |||
| 460 | rtc_update_irq(mrst->rtc, 1, mask); | ||
| 461 | tmp &= ~RTC_AIE; | ||
| 462 | } while (mask & RTC_AIE); | ||
| 463 | spin_unlock_irq(&rtc_lock); | ||
| 464 | } | ||
| 465 | |||
| 466 | dev_dbg(&mrst_rtc.rtc->dev, "resume, ctrl %02x\n", tmp); | ||
| 467 | |||
| 468 | return 0; | ||
| 469 | } | ||
| 470 | |||
| 471 | static SIMPLE_DEV_PM_OPS(mrst_pm_ops, mrst_suspend, mrst_resume); | ||
| 472 | #define MRST_PM_OPS (&mrst_pm_ops) | ||
| 473 | |||
| 474 | #else | ||
| 475 | #define MRST_PM_OPS NULL | ||
| 476 | |||
| 477 | static inline int mrst_poweroff(struct device *dev) | ||
| 478 | { | ||
| 479 | return -ENOSYS; | ||
| 480 | } | ||
| 481 | |||
| 482 | #endif | ||
| 483 | |||
| 484 | static int vrtc_mrst_platform_probe(struct platform_device *pdev) | ||
| 485 | { | ||
| 486 | return vrtc_mrst_do_probe(&pdev->dev, | ||
| 487 | platform_get_resource(pdev, IORESOURCE_MEM, 0), | ||
| 488 | platform_get_irq(pdev, 0)); | ||
| 489 | } | ||
| 490 | |||
| 491 | static int vrtc_mrst_platform_remove(struct platform_device *pdev) | ||
| 492 | { | ||
| 493 | rtc_mrst_do_remove(&pdev->dev); | ||
| 494 | return 0; | ||
| 495 | } | ||
| 496 | |||
| 497 | static void vrtc_mrst_platform_shutdown(struct platform_device *pdev) | ||
| 498 | { | ||
| 499 | if (system_state == SYSTEM_POWER_OFF && !mrst_poweroff(&pdev->dev)) | ||
| 500 | return; | ||
| 501 | |||
| 502 | rtc_mrst_do_shutdown(); | ||
| 503 | } | ||
| 504 | |||
| 505 | MODULE_ALIAS("platform:vrtc_mrst"); | ||
| 506 | |||
| 507 | static struct platform_driver vrtc_mrst_platform_driver = { | ||
| 508 | .probe = vrtc_mrst_platform_probe, | ||
| 509 | .remove = vrtc_mrst_platform_remove, | ||
| 510 | .shutdown = vrtc_mrst_platform_shutdown, | ||
| 511 | .driver = { | ||
| 512 | .name = driver_name, | ||
| 513 | .pm = MRST_PM_OPS, | ||
| 514 | } | ||
| 515 | }; | ||
| 516 | |||
| 517 | module_platform_driver(vrtc_mrst_platform_driver); | ||
| 518 | |||
| 519 | MODULE_AUTHOR("Jacob Pan; Feng Tang"); | ||
| 520 | MODULE_DESCRIPTION("Driver for Moorestown virtual RTC"); | ||
| 521 | MODULE_LICENSE("GPL"); | ||
| @@ -1219,15 +1219,6 @@ config IE6XX_WDT · 1218 unmodified lines | |||
| 1219 | To compile this driver as a module, choose M here: the | 1219 | To compile this driver as a module, choose M here: the |
| 1220 | module will be called ie6xx_wdt. | 1220 | module will be called ie6xx_wdt. |
| 1221 | 1221 | ||
| 1222 | config INTEL_SCU_WATCHDOG | ||
| 1223 | bool "Intel SCU Watchdog for Mobile Platforms" | ||
| 1224 | depends on X86_INTEL_MID | ||
| 1225 | help | ||
| 1226 | Hardware driver for the watchdog time built into the Intel SCU | ||
| 1227 | for Intel Mobile Platforms. | ||
| 1228 | |||
| 1229 | To compile this driver as a module, choose M here. | ||
| 1230 | |||
| 1231 | config INTEL_MID_WATCHDOG | 1222 | config INTEL_MID_WATCHDOG |
| 1232 | tristate "Intel MID Watchdog Timer" | 1223 | tristate "Intel MID Watchdog Timer" |
| 1233 | depends on X86_INTEL_MID | 1224 | depends on X86_INTEL_MID |
| @@ -140,7 +140,6 @@ obj-$(CONFIG_W83877F_WDT) += w83877f_wdt.o · 139 unmodified lines | |||
| 140 | obj-$(CONFIG_W83977F_WDT) += w83977f_wdt.o | 140 | obj-$(CONFIG_W83977F_WDT) += w83977f_wdt.o |
| 141 | obj-$(CONFIG_MACHZ_WDT) += machzwd.o | 141 | obj-$(CONFIG_MACHZ_WDT) += machzwd.o |
| 142 | obj-$(CONFIG_SBC_EPX_C3_WATCHDOG) += sbc_epx_c3.o | 142 | obj-$(CONFIG_SBC_EPX_C3_WATCHDOG) += sbc_epx_c3.o |
| 143 | obj-$(CONFIG_INTEL_SCU_WATCHDOG) += intel_scu_watchdog.o | ||
| 144 | obj-$(CONFIG_INTEL_MID_WATCHDOG) += intel-mid_wdt.o | 143 | obj-$(CONFIG_INTEL_MID_WATCHDOG) += intel-mid_wdt.o |
| 145 | obj-$(CONFIG_INTEL_MEI_WDT) += mei_wdt.o | 144 | obj-$(CONFIG_INTEL_MEI_WDT) += mei_wdt.o |
| 146 | obj-$(CONFIG_NI903X_WDT) += ni903x_wdt.o | 145 | obj-$(CONFIG_NI903X_WDT) += ni903x_wdt.o |
| @@ -154,6 +154,10 @@ static int mid_wdt_probe(struct platform_device *pdev) · 153 unmodified lines | |||
| 154 | watchdog_set_nowayout(wdt_dev, WATCHDOG_NOWAYOUT); | 154 | watchdog_set_nowayout(wdt_dev, WATCHDOG_NOWAYOUT); |
| 155 | watchdog_set_drvdata(wdt_dev, mid); | 155 | watchdog_set_drvdata(wdt_dev, mid); |
| 156 | 156 | ||
| 157 | mid->scu = devm_intel_scu_ipc_dev_get(dev); | ||
| 158 | if (!mid->scu) | ||
| 159 | return -EPROBE_DEFER; | ||
| 160 | |||
| 157 | ret = devm_request_irq(dev, pdata->irq, mid_wdt_irq, | 161 | ret = devm_request_irq(dev, pdata->irq, mid_wdt_irq, |
| 158 | IRQF_SHARED | IRQF_NO_SUSPEND, "watchdog", | 162 | IRQF_SHARED | IRQF_NO_SUSPEND, "watchdog", |
| 159 | wdt_dev); | 163 | wdt_dev); |
| @@ -162,10 +166,6 @@ static int mid_wdt_probe(struct platform_device *pdev) · 2 unmodified lines | |||
| 162 | return ret; | 166 | return ret; |
| 163 | } | 167 | } |
| 164 | 168 | ||
| 165 | mid->scu = devm_intel_scu_ipc_dev_get(dev); | ||
| 166 | if (!mid->scu) | ||
| 167 | return -EPROBE_DEFER; | ||
| 168 | |||
| 169 | /* | 169 | /* |
| 170 | * The firmware followed by U-Boot leaves the watchdog running | 170 | * The firmware followed by U-Boot leaves the watchdog running |
| 171 | * with the default threshold which may vary. When we get here | 171 | * with the default threshold which may vary. When we get here |
| @@ -1,533 +0,0 @@ | |||
| 1 | // SPDX-License-Identifier: GPL-2.0-only | ||
| 2 | /* | ||
| 3 | * Intel_SCU 0.2: An Intel SCU IOH Based Watchdog Device | ||
| 4 | * for Intel part #(s): | ||
| 5 | * - AF82MP20 PCH | ||
| 6 | * | ||
| 7 | * Copyright (C) 2009-2010 Intel Corporation. All rights reserved. | ||
| 8 | */ | ||
| 9 | |||
| 10 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt | ||
| 11 | |||
| 12 | #include <linux/compiler.h> | ||
| 13 | #include <linux/kernel.h> | ||
| 14 | #include <linux/moduleparam.h> | ||
| 15 | #include <linux/types.h> | ||
| 16 | #include <linux/miscdevice.h> | ||
| 17 | #include <linux/watchdog.h> | ||
| 18 | #include <linux/fs.h> | ||
| 19 | #include <linux/notifier.h> | ||
| 20 | #include <linux/reboot.h> | ||
| 21 | #include <linux/init.h> | ||
| 22 | #include <linux/jiffies.h> | ||
| 23 | #include <linux/uaccess.h> | ||
| 24 | #include <linux/slab.h> | ||
| 25 | #include <linux/io.h> | ||
| 26 | #include <linux/interrupt.h> | ||
| 27 | #include <linux/delay.h> | ||
| 28 | #include <linux/sched.h> | ||
| 29 | #include <linux/signal.h> | ||
| 30 | #include <linux/sfi.h> | ||
| 31 | #include <asm/irq.h> | ||
| 32 | #include <linux/atomic.h> | ||
| 33 | #include <asm/intel_scu_ipc.h> | ||
| 34 | #include <asm/apb_timer.h> | ||
| 35 | #include <asm/intel-mid.h> | ||
| 36 | |||
| 37 | #include "intel_scu_watchdog.h" | ||
| 38 | |||
| 39 | /* Bounds number of times we will retry loading time count */ | ||
| 40 | /* This retry is a work around for a silicon bug. */ | ||
| 41 | #define MAX_RETRY 16 | ||
| 42 | |||
| 43 | #define IPC_SET_WATCHDOG_TIMER 0xF8 | ||
| 44 | |||
| 45 | static int timer_margin = DEFAULT_SOFT_TO_HARD_MARGIN; | ||
| 46 | module_param(timer_margin, int, 0); | ||
| 47 | MODULE_PARM_DESC(timer_margin, | ||
| 48 | "Watchdog timer margin" | ||
| 49 | "Time between interrupt and resetting the system" | ||
| 50 | "The range is from 1 to 160" | ||
| 51 | "This is the time for all keep alives to arrive"); | ||
| 52 | |||
| 53 | static int timer_set = DEFAULT_TIME; | ||
| 54 | module_param(timer_set, int, 0); | ||
| 55 | MODULE_PARM_DESC(timer_set, | ||
| 56 | "Default Watchdog timer setting" | ||
| 57 | "Complete cycle time" | ||
| 58 | "The range is from 1 to 170" | ||
| 59 | "This is the time for all keep alives to arrive"); | ||
| 60 | |||
| 61 | /* After watchdog device is closed, check force_boot. If: | ||
| 62 | * force_boot == 0, then force boot on next watchdog interrupt after close, | ||
| 63 | * force_boot == 1, then force boot immediately when device is closed. | ||
| 64 | */ | ||
| 65 | static int force_boot; | ||
| 66 | module_param(force_boot, int, 0); | ||
| 67 | MODULE_PARM_DESC(force_boot, | ||
| 68 | "A value of 1 means that the driver will reboot" | ||
| 69 | "the system immediately if the /dev/watchdog device is closed" | ||
| 70 | "A value of 0 means that when /dev/watchdog device is closed" | ||
| 71 | "the watchdog timer will be refreshed for one more interval" | ||
| 72 | "of length: timer_set. At the end of this interval, the" | ||
| 73 | "watchdog timer will reset the system." | ||
| 74 | ); | ||
| 75 | |||
| 76 | /* there is only one device in the system now; this can be made into | ||
| 77 | * an array in the future if we have more than one device */ | ||
| 78 | |||
| 79 | static struct intel_scu_watchdog_dev watchdog_device; | ||
| 80 | |||
| 81 | /* Forces restart, if force_reboot is set */ | ||
| 82 | static void watchdog_fire(void) | ||
| 83 | { | ||
| 84 | if (force_boot) { | ||
| 85 | pr_crit("Initiating system reboot\n"); | ||
| 86 | emergency_restart(); | ||
| 87 | pr_crit("Reboot didn't ?????\n"); | ||
| 88 | } | ||
| 89 | |||
| 90 | else { | ||
| 91 | pr_crit("Immediate Reboot Disabled\n"); | ||
| 92 | pr_crit("System will reset when watchdog timer times out!\n"); | ||
| 93 | } | ||
| 94 | } | ||
| 95 | |||
| 96 | static int check_timer_margin(int new_margin) | ||
| 97 | { | ||
| 98 | if ((new_margin < MIN_TIME_CYCLE) || | ||
| 99 | (new_margin > MAX_TIME - timer_set)) { | ||
| 100 | pr_debug("value of new_margin %d is out of the range %d to %d\n", | ||
| 101 | new_margin, MIN_TIME_CYCLE, MAX_TIME - timer_set); | ||
| 102 | return -EINVAL; | ||
| 103 | } | ||
| 104 | return 0; | ||
| 105 | } | ||
| 106 | |||
| 107 | /* | ||
| 108 | * IPC operations | ||
| 109 | */ | ||
| 110 | static int watchdog_set_ipc(int soft_threshold, int threshold) | ||
| 111 | { | ||
| 112 | u32 *ipc_wbuf; | ||
| 113 | u8 cbuf[16] = { '\0' }; | ||
| 114 | int ipc_ret = 0; | ||
| 115 | |||
| 116 | ipc_wbuf = (u32 *)&cbuf; | ||
| 117 | ipc_wbuf[0] = soft_threshold; | ||
| 118 | ipc_wbuf[1] = threshold; | ||
| 119 | |||
| 120 | ipc_ret = intel_scu_ipc_command( | ||
| 121 | IPC_SET_WATCHDOG_TIMER, | ||
| 122 | 0, | ||
| 123 | ipc_wbuf, | ||
| 124 | 2, | ||
| 125 | NULL, | ||
| 126 | 0); | ||
| 127 | |||
| 128 | if (ipc_ret != 0) | ||
| 129 | pr_err("Error setting SCU watchdog timer: %x\n", ipc_ret); | ||
| 130 | |||
| 131 | return ipc_ret; | ||
| 132 | }; | ||
| 133 | |||
| 134 | /* | ||
| 135 | * Intel_SCU operations | ||
| 136 | */ | ||
| 137 | |||
| 138 | /* timer interrupt handler */ | ||
| 139 | static irqreturn_t watchdog_timer_interrupt(int irq, void *dev_id) | ||
| 140 | { | ||
| 141 | int int_status; | ||
| 142 | int_status = ioread32(watchdog_device.timer_interrupt_status_addr); | ||
| 143 | |||
| 144 | pr_debug("irq, int_status: %x\n", int_status); | ||
| 145 | |||
| 146 | if (int_status != 0) | ||
| 147 | return IRQ_NONE; | ||
| 148 | |||
| 149 | /* has the timer been started? If not, then this is spurious */ | ||
| 150 | if (watchdog_device.timer_started == 0) { | ||
| 151 | pr_debug("spurious interrupt received\n"); | ||
| 152 | return IRQ_HANDLED; | ||
| 153 | } | ||
| 154 | |||
| 155 | /* temporarily disable the timer */ | ||
| 156 | iowrite32(0x00000002, watchdog_device.timer_control_addr); | ||
| 157 | |||
| 158 | /* set the timer to the threshold */ | ||
| 159 | iowrite32(watchdog_device.threshold, | ||
| 160 | watchdog_device.timer_load_count_addr); | ||
| 161 | |||
| 162 | /* allow the timer to run */ | ||
| 163 | iowrite32(0x00000003, watchdog_device.timer_control_addr); | ||
| 164 | |||
| 165 | return IRQ_HANDLED; | ||
| 166 | } | ||
| 167 | |||
| 168 | static int intel_scu_keepalive(void) | ||
| 169 | { | ||
| 170 | |||
| 171 | /* read eoi register - clears interrupt */ | ||
| 172 | ioread32(watchdog_device.timer_clear_interrupt_addr); | ||
| 173 | |||
| 174 | /* temporarily disable the timer */ | ||
| 175 | iowrite32(0x00000002, watchdog_device.timer_control_addr); | ||
| 176 | |||
| 177 | /* set the timer to the soft_threshold */ | ||
| 178 | iowrite32(watchdog_device.soft_threshold, | ||
| 179 | watchdog_device.timer_load_count_addr); | ||
| 180 | |||
| 181 | /* allow the timer to run */ | ||
| 182 | iowrite32(0x00000003, watchdog_device.timer_control_addr); | ||
| 183 | |||
| 184 | return 0; | ||
| 185 | } | ||
| 186 | |||
| 187 | static int intel_scu_stop(void) | ||
| 188 | { | ||
| 189 | iowrite32(0, watchdog_device.timer_control_addr); | ||
| 190 | return 0; | ||
| 191 | } | ||
| 192 | |||
| 193 | static int intel_scu_set_heartbeat(u32 t) | ||
| 194 | { | ||
| 195 | int ipc_ret; | ||
| 196 | int retry_count; | ||
| 197 | u32 soft_value; | ||
| 198 | u32 hw_value; | ||
| 199 | |||
| 200 | watchdog_device.timer_set = t; | ||
| 201 | watchdog_device.threshold = | ||
| 202 | timer_margin * watchdog_device.timer_tbl_ptr->freq_hz; | ||
| 203 | watchdog_device.soft_threshold = | ||
| 204 | (watchdog_device.timer_set - timer_margin) | ||
| 205 | * watchdog_device.timer_tbl_ptr->freq_hz; | ||
| 206 | |||
| 207 | pr_debug("set_heartbeat: timer freq is %d\n", | ||
| 208 | watchdog_device.timer_tbl_ptr->freq_hz); | ||
| 209 | pr_debug("set_heartbeat: timer_set is %x (hex)\n", | ||
| 210 | watchdog_device.timer_set); | ||
| 211 | pr_debug("set_heartbeat: timer_margin is %x (hex)\n", timer_margin); | ||
| 212 | pr_debug("set_heartbeat: threshold is %x (hex)\n", | ||
| 213 | watchdog_device.threshold); | ||
| 214 | pr_debug("set_heartbeat: soft_threshold is %x (hex)\n", | ||
| 215 | watchdog_device.soft_threshold); | ||
| 216 | |||
| 217 | /* Adjust thresholds by FREQ_ADJUSTMENT factor, to make the */ | ||
| 218 | /* watchdog timing come out right. */ | ||
| 219 | watchdog_device.threshold = | ||
| 220 | watchdog_device.threshold / FREQ_ADJUSTMENT; | ||
| 221 | watchdog_device.soft_threshold = | ||
| 222 | watchdog_device.soft_threshold / FREQ_ADJUSTMENT; | ||
| 223 | |||
| 224 | /* temporarily disable the timer */ | ||
| 225 | iowrite32(0x00000002, watchdog_device.timer_control_addr); | ||
| 226 | |||
| 227 | /* send the threshold and soft_threshold via IPC to the processor */ | ||
| 228 | ipc_ret = watchdog_set_ipc(watchdog_device.soft_threshold, | ||
| 229 | watchdog_device.threshold); | ||
| 230 | |||
| 231 | if (ipc_ret != 0) { | ||
| 232 | /* Make sure the watchdog timer is stopped */ | ||
| 233 | intel_scu_stop(); | ||
| 234 | return ipc_ret; | ||
| 235 | } | ||
| 236 | |||
| 237 | /* Soft Threshold set loop. Early versions of silicon did */ | ||
| 238 | /* not always set this count correctly. This loop checks */ | ||
| 239 | /* the value and retries if it was not set correctly. */ | ||
| 240 | |||
| 241 | retry_count = 0; | ||
| 242 | soft_value = watchdog_device.soft_threshold & 0xFFFF0000; | ||
| 243 | do { | ||
| 244 | |||
| 245 | /* Make sure timer is stopped */ | ||
| 246 | intel_scu_stop(); | ||
| 247 | |||
| 248 | if (MAX_RETRY < retry_count++) { | ||
| 249 | /* Unable to set timer value */ | ||
| 250 | pr_err("Unable to set timer\n"); | ||
| 251 | return -ENODEV; | ||
| 252 | } | ||
| 253 | |||
| 254 | /* set the timer to the soft threshold */ | ||
| 255 | iowrite32(watchdog_device.soft_threshold, | ||
| 256 | watchdog_device.timer_load_count_addr); | ||
| 257 | |||
| 258 | /* read count value before starting timer */ | ||
| 259 | ioread32(watchdog_device.timer_load_count_addr); | ||
| 260 | |||
| 261 | /* Start the timer */ | ||
| 262 | iowrite32(0x00000003, watchdog_device.timer_control_addr); | ||
| 263 | |||
| 264 | /* read the value the time loaded into its count reg */ | ||
| 265 | hw_value = ioread32(watchdog_device.timer_load_count_addr); | ||
| 266 | hw_value = hw_value & 0xFFFF0000; | ||
| 267 | |||
| 268 | |||
| 269 | } while (soft_value != hw_value); | ||
| 270 | |||
| 271 | watchdog_device.timer_started = 1; | ||
| 272 | |||
| 273 | return 0; | ||
| 274 | } | ||
| 275 | |||
| 276 | /* | ||
| 277 | * /dev/watchdog handling | ||
| 278 | */ | ||
| 279 | |||
| 280 | static int intel_scu_open(struct inode *inode, struct file *file) | ||
| 281 | { | ||
| 282 | |||
| 283 | /* Set flag to indicate that watchdog device is open */ | ||
| 284 | if (test_and_set_bit(0, &watchdog_device.driver_open)) | ||
| 285 | return -EBUSY; | ||
| 286 | |||
| 287 | /* Check for reopen of driver. Reopens are not allowed */ | ||
| 288 | if (watchdog_device.driver_closed) | ||
| 289 | return -EPERM; | ||
| 290 | |||
| 291 | return stream_open(inode, file); | ||
| 292 | } | ||
| 293 | |||
| 294 | static int intel_scu_release(struct inode *inode, struct file *file) | ||
| 295 | { | ||
| 296 | /* | ||
| 297 | * This watchdog should not be closed, after the timer | ||
| 298 | * is started with the WDIPC_SETTIMEOUT ioctl | ||
| 299 | * If force_boot is set watchdog_fire() will cause an | ||
| 300 | * immediate reset. If force_boot is not set, the watchdog | ||
| 301 | * timer is refreshed for one more interval. At the end | ||
| 302 | * of that interval, the watchdog timer will reset the system. | ||
| 303 | */ | ||
| 304 | |||
| 305 | if (!test_and_clear_bit(0, &watchdog_device.driver_open)) { | ||
| 306 | pr_debug("intel_scu_release, without open\n"); | ||
| 307 | return -ENOTTY; | ||
| 308 | } | ||
| 309 | |||
| 310 | if (!watchdog_device.timer_started) { | ||
| 311 | /* Just close, since timer has not been started */ | ||
| 312 | pr_debug("closed, without starting timer\n"); | ||
| 313 | return 0; | ||
| 314 | } | ||
| 315 | |||
| 316 | pr_crit("Unexpected close of /dev/watchdog!\n"); | ||
| 317 | |||
| 318 | /* Since the timer was started, prevent future reopens */ | ||
| 319 | watchdog_device.driver_closed = 1; | ||
| 320 | |||
| 321 | /* Refresh the timer for one more interval */ | ||
| 322 | intel_scu_keepalive(); | ||
| 323 | |||
| 324 | /* Reboot system (if force_boot is set) */ | ||
| 325 | watchdog_fire(); | ||
| 326 | |||
| 327 | /* We should only reach this point if force_boot is not set */ | ||
| 328 | return 0; | ||
| 329 | } | ||
| 330 | |||
| 331 | static ssize_t intel_scu_write(struct file *file, | ||
| 332 | char const *data, | ||
| 333 | size_t len, | ||
| 334 | loff_t *ppos) | ||
| 335 | { | ||
| 336 | |||
| 337 | if (watchdog_device.timer_started) | ||
| 338 | /* Watchdog already started, keep it alive */ | ||
| 339 | intel_scu_keepalive(); | ||
| 340 | else | ||
| 341 | /* Start watchdog with timer value set by init */ | ||
| 342 | intel_scu_set_heartbeat(watchdog_device.timer_set); | ||
| 343 | |||
| 344 | return len; | ||
| 345 | } | ||
| 346 | |||
| 347 | static long intel_scu_ioctl(struct file *file, | ||
| 348 | unsigned int cmd, | ||
| 349 | unsigned long arg) | ||
| 350 | { | ||
| 351 | void __user *argp = (void __user *)arg; | ||
| 352 | u32 __user *p = argp; | ||
| 353 | u32 new_margin; | ||
| 354 | |||
| 355 | |||
| 356 | static const struct watchdog_info ident = { | ||
| 357 | .options = WDIOF_SETTIMEOUT | ||
| 358 | | WDIOF_KEEPALIVEPING, | ||
| 359 | .firmware_version = 0, /* @todo Get from SCU via | ||
| 360 | ipc_get_scu_fw_version()? */ | ||
| 361 | .identity = "Intel_SCU IOH Watchdog" /* len < 32 */ | ||
| 362 | }; | ||
| 363 | |||
| 364 | switch (cmd) { | ||
| 365 | case WDIOC_GETSUPPORT: | ||
| 366 | return copy_to_user(argp, | ||
| 367 | &ident, | ||
| 368 | sizeof(ident)) ? -EFAULT : 0; | ||
| 369 | case WDIOC_GETSTATUS: | ||
| 370 | case WDIOC_GETBOOTSTATUS: | ||
| 371 | return put_user(0, p); | ||
| 372 | case WDIOC_KEEPALIVE: | ||
| 373 | intel_scu_keepalive(); | ||
| 374 | |||
| 375 | return 0; | ||
| 376 | case WDIOC_SETTIMEOUT: | ||
| 377 | if (get_user(new_margin, p)) | ||
| 378 | return -EFAULT; | ||
| 379 | |||
| 380 | if (check_timer_margin(new_margin)) | ||
| 381 | return -EINVAL; | ||
| 382 | |||
| 383 | if (intel_scu_set_heartbeat(new_margin)) | ||
| 384 | return -EINVAL; | ||
| 385 | return 0; | ||
| 386 | case WDIOC_GETTIMEOUT: | ||
| 387 | return put_user(watchdog_device.soft_threshold, p); | ||
| 388 | |||
| 389 | default: | ||
| 390 | return -ENOTTY; | ||
| 391 | } | ||
| 392 | } | ||
| 393 | |||
| 394 | /* | ||
| 395 | * Notifier for system down | ||
| 396 | */ | ||
| 397 | static int intel_scu_notify_sys(struct notifier_block *this, | ||
| 398 | unsigned long code, | ||
| 399 | void *another_unused) | ||
| 400 | { | ||
| 401 | if (code == SYS_DOWN || code == SYS_HALT) | ||
| 402 | /* Turn off the watchdog timer. */ | ||
| 403 | intel_scu_stop(); | ||
| 404 | return NOTIFY_DONE; | ||
| 405 | } | ||
| 406 | |||
| 407 | /* | ||
| 408 | * Kernel Interfaces | ||
| 409 | */ | ||
| 410 | static const struct file_operations intel_scu_fops = { | ||
| 411 | .owner = THIS_MODULE, | ||
| 412 | .llseek = no_llseek, | ||
| 413 | .write = intel_scu_write, | ||
| 414 | .unlocked_ioctl = intel_scu_ioctl, | ||
| 415 | .compat_ioctl = compat_ptr_ioctl, | ||
| 416 | .open = intel_scu_open, | ||
| 417 | .release = intel_scu_release, | ||
| 418 | }; | ||
| 419 | |||
| 420 | static int __init intel_scu_watchdog_init(void) | ||
| 421 | { | ||
| 422 | int ret; | ||
| 423 | u32 __iomem *tmp_addr; | ||
| 424 | |||
| 425 | /* | ||
| 426 | * We don't really need to check this as the SFI timer get will fail | ||
| 427 | * but if we do so we can exit with a clearer reason and no noise. | ||
| 428 | * | ||
| 429 | * If it isn't an intel MID device then it doesn't have this watchdog | ||
| 430 | */ | ||
| 431 | if (!intel_mid_identify_cpu()) | ||
| 432 | return -ENODEV; | ||
| 433 | |||
| 434 | /* Check boot parameters to verify that their initial values */ | ||
| 435 | /* are in range. */ | ||
| 436 | /* Check value of timer_set boot parameter */ | ||
| 437 | if ((timer_set < MIN_TIME_CYCLE) || | ||
| 438 | (timer_set > MAX_TIME - MIN_TIME_CYCLE)) { | ||
| 439 | pr_err("value of timer_set %x (hex) is out of range from %x to %x (hex)\n", | ||
| 440 | timer_set, MIN_TIME_CYCLE, MAX_TIME - MIN_TIME_CYCLE); | ||
| 441 | return -EINVAL; | ||
| 442 | } | ||
| 443 | |||
| 444 | /* Check value of timer_margin boot parameter */ | ||
| 445 | if (check_timer_margin(timer_margin)) | ||
| 446 | return -EINVAL; | ||
| 447 | |||
| 448 | watchdog_device.timer_tbl_ptr = sfi_get_mtmr(sfi_mtimer_num-1); | ||
| 449 | |||
| 450 | if (watchdog_device.timer_tbl_ptr == NULL) { | ||
| 451 | pr_debug("timer is not available\n"); | ||
| 452 | return -ENODEV; | ||
| 453 | } | ||
| 454 | /* make sure the timer exists */ | ||
| 455 | if (watchdog_device.timer_tbl_ptr->phys_addr == 0) { | ||
| 456 | pr_debug("timer %d does not have valid physical memory\n", | ||
| 457 | sfi_mtimer_num); | ||
| 458 | return -ENODEV; | ||
| 459 | } | ||
| 460 | |||
| 461 | if (watchdog_device.timer_tbl_ptr->irq == 0) { | ||
| 462 | pr_debug("timer %d invalid irq\n", sfi_mtimer_num); | ||
| 463 | return -ENODEV; | ||
| 464 | } | ||
| 465 | |||
| 466 | tmp_addr = ioremap(watchdog_device.timer_tbl_ptr->phys_addr, | ||
| 467 | 20); | ||
| 468 | |||
| 469 | if (tmp_addr == NULL) { | ||
| 470 | pr_debug("timer unable to ioremap\n"); | ||
| 471 | return -ENOMEM; | ||
| 472 | } | ||
| 473 | |||
| 474 | watchdog_device.timer_load_count_addr = tmp_addr++; | ||
| 475 | watchdog_device.timer_current_value_addr = tmp_addr++; | ||
| 476 | watchdog_device.timer_control_addr = tmp_addr++; | ||
| 477 | watchdog_device.timer_clear_interrupt_addr = tmp_addr++; | ||
| 478 | watchdog_device.timer_interrupt_status_addr = tmp_addr++; | ||
| 479 | |||
| 480 | /* Set the default time values in device structure */ | ||
| 481 | |||
| 482 | watchdog_device.timer_set = timer_set; | ||
| 483 | watchdog_device.threshold = | ||
| 484 | timer_margin * watchdog_device.timer_tbl_ptr->freq_hz; | ||
| 485 | watchdog_device.soft_threshold = | ||
| 486 | (watchdog_device.timer_set - timer_margin) | ||
| 487 | * watchdog_device.timer_tbl_ptr->freq_hz; | ||
| 488 | |||
| 489 | |||
| 490 | watchdog_device.intel_scu_notifier.notifier_call = | ||
| 491 | intel_scu_notify_sys; | ||
| 492 | |||
| 493 | ret = register_reboot_notifier(&watchdog_device.intel_scu_notifier); | ||
| 494 | if (ret) { | ||
| 495 | pr_err("cannot register notifier %d)\n", ret); | ||
| 496 | goto register_reboot_error; | ||
| 497 | } | ||
| 498 | |||
| 499 | watchdog_device.miscdev.minor = WATCHDOG_MINOR; | ||
| 500 | watchdog_device.miscdev.name = "watchdog"; | ||
| 501 | watchdog_device.miscdev.fops = &intel_scu_fops; | ||
| 502 | |||
| 503 | ret = misc_register(&watchdog_device.miscdev); | ||
| 504 | if (ret) { | ||
| 505 | pr_err("cannot register miscdev %d err =%d\n", | ||
| 506 | WATCHDOG_MINOR, ret); | ||
| 507 | goto misc_register_error; | ||
| 508 | } | ||
| 509 | |||
| 510 | ret = request_irq((unsigned int)watchdog_device.timer_tbl_ptr->irq, | ||
| 511 | watchdog_timer_interrupt, | ||
| 512 | IRQF_SHARED, "watchdog", | ||
| 513 | &watchdog_device.timer_load_count_addr); | ||
| 514 | if (ret) { | ||
| 515 | pr_err("error requesting irq %d\n", ret); | ||
| 516 | goto request_irq_error; | ||
| 517 | } | ||
| 518 | /* Make sure timer is disabled before returning */ | ||
| 519 | intel_scu_stop(); | ||
| 520 | return 0; | ||
| 521 | |||
| 522 | /* error cleanup */ | ||
| 523 | |||
| 524 | request_irq_error: | ||
| 525 | misc_deregister(&watchdog_device.miscdev); | ||
| 526 | misc_register_error: | ||
| 527 | unregister_reboot_notifier(&watchdog_device.intel_scu_notifier); | ||
| 528 | register_reboot_error: | ||
| 529 | intel_scu_stop(); | ||
| 530 | iounmap(watchdog_device.timer_load_count_addr); | ||
| 531 | return ret; | ||
| 532 | } | ||
| 533 | late_initcall(intel_scu_watchdog_init); | ||
| @@ -1,50 +0,0 @@ | |||
| 1 | /* SPDX-License-Identifier: GPL-2.0-only */ | ||
| 2 | /* | ||
| 3 | * Intel_SCU 0.2: An Intel SCU IOH Based Watchdog Device | ||
| 4 | * for Intel part #(s): | ||
| 5 | * - AF82MP20 PCH | ||
| 6 | * | ||
| 7 | * Copyright (C) 2009-2010 Intel Corporation. All rights reserved. | ||
| 8 | */ | ||
| 9 | |||
| 10 | #ifndef __INTEL_SCU_WATCHDOG_H | ||
| 11 | #define __INTEL_SCU_WATCHDOG_H | ||
| 12 | |||
| 13 | #define WDT_VER "0.3" | ||
| 14 | |||
| 15 | /* minimum time between interrupts */ | ||
| 16 | #define MIN_TIME_CYCLE 1 | ||
| 17 | |||
| 18 | /* Time from warning to reboot is 2 seconds */ | ||
| 19 | #define DEFAULT_SOFT_TO_HARD_MARGIN 2 | ||
| 20 | |||
| 21 | #define MAX_TIME 170 | ||
| 22 | |||
| 23 | #define DEFAULT_TIME 5 | ||
| 24 | |||
| 25 | #define MAX_SOFT_TO_HARD_MARGIN (MAX_TIME-MIN_TIME_CYCLE) | ||
| 26 | |||
| 27 | /* Ajustment to clock tick frequency to make timing come out right */ | ||
| 28 | #define FREQ_ADJUSTMENT 8 | ||
| 29 | |||
| 30 | struct intel_scu_watchdog_dev { | ||
| 31 | ulong driver_open; | ||
| 32 | ulong driver_closed; | ||
| 33 | u32 timer_started; | ||
| 34 | u32 timer_set; | ||
| 35 | u32 threshold; | ||
| 36 | u32 soft_threshold; | ||
| 37 | u32 __iomem *timer_load_count_addr; | ||
| 38 | u32 __iomem *timer_current_value_addr; | ||
| 39 | u32 __iomem *timer_control_addr; | ||
| 40 | u32 __iomem *timer_clear_interrupt_addr; | ||
| 41 | u32 __iomem *timer_interrupt_status_addr; | ||
| 42 | struct sfi_timer_table_entry *timer_tbl_ptr; | ||
| 43 | struct notifier_block intel_scu_notifier; | ||
| 44 | struct miscdevice miscdev; | ||
| 45 | }; | ||
| 46 | |||
| 47 | extern int sfi_mtimer_num; | ||
| 48 | |||
| 49 | /* extern struct sfi_timer_table_entry *sfi_get_mtmr(int hint); */ | ||
| 50 | #endif /* __INTEL_SCU_WATCHDOG_H */ | ||
| @@ -846,4 +846,22 @@ struct auxiliary_device_id { · 845 unmodified lines | |||
| 846 | kernel_ulong_t driver_data; | 846 | kernel_ulong_t driver_data; |
| 847 | }; | 847 | }; |
| 848 | 848 | ||
| 849 | /* Surface System Aggregator Module */ | ||
| 850 | |||
| 851 | #define SSAM_MATCH_TARGET 0x1 | ||
| 852 | #define SSAM_MATCH_INSTANCE 0x2 | ||
| 853 | #define SSAM_MATCH_FUNCTION 0x4 | ||
| 854 | |||
| 855 | struct ssam_device_id { | ||
| 856 | __u8 match_flags; | ||
| 857 | |||
| 858 | __u8 domain; | ||
| 859 | __u8 category; | ||
| 860 | __u8 target; | ||
| 861 | __u8 instance; | ||
| 862 | __u8 function; | ||
| 863 | |||
| 864 | kernel_ulong_t driver_data; | ||
| 865 | }; | ||
| 866 | |||
| 849 | #endif /* LINUX_MOD_DEVICETABLE_H */ | 867 | #endif /* LINUX_MOD_DEVICETABLE_H */ |
| @@ -31,7 +31,7 @@ · 30 unmodified lines | |||
| 31 | #if IS_ENABLED(CONFIG_SONY_LAPTOP) | 31 | #if IS_ENABLED(CONFIG_SONY_LAPTOP) |
| 32 | int sony_pic_camera_command(int command, u8 value); | 32 | int sony_pic_camera_command(int command, u8 value); |
| 33 | #else | 33 | #else |
| 34 | static inline int sony_pic_camera_command(int command, u8 value) { return 0; }; | 34 | static inline int sony_pic_camera_command(int command, u8 value) { return 0; } |
| 35 | #endif | 35 | #endif |
| 36 | 36 | ||
| 37 | #endif /* __KERNEL__ */ | 37 | #endif /* __KERNEL__ */ |
| @@ -0,0 +1,39 @@ | |||
| 1 | /* SPDX-License-Identifier: GPL-2.0+ */ | ||
| 2 | /* | ||
| 3 | * Interface for Surface ACPI Notify (SAN) driver. | ||
| 4 | * | ||
| 5 | * Provides access to discrete GPU notifications sent from ACPI via the SAN | ||
| 6 | * driver, which are not handled by this driver directly. | ||
| 7 | * | ||
| 8 | * Copyright (C) 2019-2020 Maximilian Luz <luzmaximilian@gmail.com> | ||
| 9 | */ | ||
| 10 | |||
| 11 | #ifndef _LINUX_SURFACE_ACPI_NOTIFY_H | ||
| 12 | #define _LINUX_SURFACE_ACPI_NOTIFY_H | ||
| 13 | |||
| 14 | #include <linux/notifier.h> | ||
| 15 | #include <linux/types.h> | ||
| 16 | |||
| 17 | /** | ||
| 18 | * struct san_dgpu_event - Discrete GPU ACPI event. | ||
| 19 | * @category: Category of the event. | ||
| 20 | * @target: Target ID of the event source. | ||
| 21 | * @command: Command ID of the event. | ||
| 22 | * @instance: Instance ID of the event source. | ||
| 23 | * @length: Length of the event's payload data (in bytes). | ||
| 24 | * @payload: Pointer to the event's payload data. | ||
| 25 | */ | ||
| 26 | struct san_dgpu_event { | ||
| 27 | u8 category; | ||
| 28 | u8 target; | ||
| 29 | u8 command; | ||
| 30 | u8 instance; | ||
| 31 | u16 length; | ||
| 32 | u8 *payload; | ||
| 33 | }; | ||
| 34 | |||
| 35 | int san_client_link(struct device *client); | ||
| 36 | int san_dgpu_notifier_register(struct notifier_block *nb); | ||
| 37 | int san_dgpu_notifier_unregister(struct notifier_block *nb); | ||
| 38 | |||
| 39 | #endif /* _LINUX_SURFACE_ACPI_NOTIFY_H */ | ||
| @@ -0,0 +1,824 @@ | |||
| 1 | /* SPDX-License-Identifier: GPL-2.0+ */ | ||
| 2 | /* | ||
| 3 | * Surface System Aggregator Module (SSAM) controller interface. | ||
| 4 | * | ||
| 5 | * Main communication interface for the SSAM EC. Provides a controller | ||
| 6 | * managing access and communication to and from the SSAM EC, as well as main | ||
| 7 | * communication structures and definitions. | ||
| 8 | * | ||
| 9 | * Copyright (C) 2019-2020 Maximilian Luz <luzmaximilian@gmail.com> | ||
| 10 | */ | ||
| 11 | |||
| 12 | #ifndef _LINUX_SURFACE_AGGREGATOR_CONTROLLER_H | ||
| 13 | #define _LINUX_SURFACE_AGGREGATOR_CONTROLLER_H | ||
| 14 | |||
| 15 | #include <linux/completion.h> | ||
| 16 | #include <linux/device.h> | ||
| 17 | #include <linux/types.h> | ||
| 18 | |||
| 19 | #include <linux/surface_aggregator/serial_hub.h> | ||
| 20 | |||
| 21 | |||
| 22 | /* -- Main data types and definitions --------------------------------------- */ | ||
| 23 | |||
| 24 | /** | ||
| 25 | * enum ssam_event_flags - Flags for enabling/disabling SAM events | ||
| 26 | * @SSAM_EVENT_SEQUENCED: The event will be sent via a sequenced data frame. | ||
| 27 | */ | ||
| 28 | enum ssam_event_flags { | ||
| 29 | SSAM_EVENT_SEQUENCED = BIT(0), | ||
| 30 | }; | ||
| 31 | |||
| 32 | /** | ||
| 33 | * struct ssam_event - SAM event sent from the EC to the host. | ||
| 34 | * @target_category: Target category of the event source. See &enum ssam_ssh_tc. | ||
| 35 | * @target_id: Target ID of the event source. | ||
| 36 | * @command_id: Command ID of the event. | ||
| 37 | * @instance_id: Instance ID of the event source. | ||
| 38 | * @length: Length of the event payload in bytes. | ||
| 39 | * @data: Event payload data. | ||
| 40 | */ | ||
| 41 | struct ssam_event { | ||
| 42 | u8 target_category; | ||
| 43 | u8 target_id; | ||
| 44 | u8 command_id; | ||
| 45 | u8 instance_id; | ||
| 46 | u16 length; | ||
| 47 | u8 data[]; | ||
| 48 | }; | ||
| 49 | |||
| 50 | /** | ||
| 51 | * enum ssam_request_flags - Flags for SAM requests. | ||
| 52 | * | ||
| 53 | * @SSAM_REQUEST_HAS_RESPONSE: | ||
| 54 | * Specifies that the request expects a response. If not set, the request | ||
| 55 | * will be directly completed after its underlying packet has been | ||
| 56 | * transmitted. If set, the request transport system waits for a response | ||
| 57 | * of the request. | ||
| 58 | * | ||
| 59 | * @SSAM_REQUEST_UNSEQUENCED: | ||
| 60 | * Specifies that the request should be transmitted via an unsequenced | ||
| 61 | * packet. If set, the request must not have a response, meaning that this | ||
| 62 | * flag and the %SSAM_REQUEST_HAS_RESPONSE flag are mutually exclusive. | ||
| 63 | */ | ||
| 64 | enum ssam_request_flags { | ||
| 65 | SSAM_REQUEST_HAS_RESPONSE = BIT(0), | ||
| 66 | SSAM_REQUEST_UNSEQUENCED = BIT(1), | ||
| 67 | }; | ||
| 68 | |||
| 69 | /** | ||
| 70 | * struct ssam_request - SAM request description. | ||
| 71 | * @target_category: Category of the request's target. See &enum ssam_ssh_tc. | ||
| 72 | * @target_id: ID of the request's target. | ||
| 73 | * @command_id: Command ID of the request. | ||
| 74 | * @instance_id: Instance ID of the request's target. | ||
| 75 | * @flags: Flags for the request. See &enum ssam_request_flags. | ||
| 76 | * @length: Length of the request payload in bytes. | ||
| 77 | * @payload: Request payload data. | ||
| 78 | * | ||
| 79 | * This struct fully describes a SAM request with payload. It is intended to | ||
| 80 | * help set up the actual transport struct, e.g. &struct ssam_request_sync, | ||
| 81 | * and specifically its raw message data via ssam_request_write_data(). | ||
| 82 | */ | ||
| 83 | struct ssam_request { | ||
| 84 | u8 target_category; | ||
| 85 | u8 target_id; | ||
| 86 | u8 command_id; | ||
| 87 | u8 instance_id; | ||
| 88 | u16 flags; | ||
| 89 | u16 length; | ||
| 90 | const u8 *payload; | ||
| 91 | }; | ||
| 92 | |||
| 93 | /** | ||
| 94 | * struct ssam_response - Response buffer for SAM request. | ||
| 95 | * @capacity: Capacity of the buffer, in bytes. | ||
| 96 | * @length: Length of the actual data stored in the memory pointed to by | ||
| 97 | * @pointer, in bytes. Set by the transport system. | ||
| 98 | * @pointer: Pointer to the buffer's memory, storing the response payload data. | ||
| 99 | */ | ||
| 100 | struct ssam_response { | ||
| 101 | size_t capacity; | ||
| 102 | size_t length; | ||
| 103 | u8 *pointer; | ||
| 104 | }; | ||
| 105 | |||
| 106 | struct ssam_controller; | ||
| 107 | |||
| 108 | struct ssam_controller *ssam_get_controller(void); | ||
| 109 | struct ssam_controller *ssam_client_bind(struct device *client); | ||
| 110 | int ssam_client_link(struct ssam_controller *ctrl, struct device *client); | ||
| 111 | |||
| 112 | struct device *ssam_controller_device(struct ssam_controller *c); | ||
| 113 | |||
| 114 | struct ssam_controller *ssam_controller_get(struct ssam_controller *c); | ||
| 115 | void ssam_controller_put(struct ssam_controller *c); | ||
| 116 | |||
| 117 | void ssam_controller_statelock(struct ssam_controller *c); | ||
| 118 | void ssam_controller_stateunlock(struct ssam_controller *c); | ||
| 119 | |||
| 120 | ssize_t ssam_request_write_data(struct ssam_span *buf, | ||
| 121 | struct ssam_controller *ctrl, | ||
| 122 | const struct ssam_request *spec); | ||
| 123 | |||
| 124 | |||
| 125 | /* -- Synchronous request interface. ---------------------------------------- */ | ||
| 126 | |||
| 127 | /** | ||
| 128 | * struct ssam_request_sync - Synchronous SAM request struct. | ||
| 129 | * @base: Underlying SSH request. | ||
| 130 | * @comp: Completion used to signal full completion of the request. After the | ||
| 131 | * request has been submitted, this struct may only be modified or | ||
| 132 | * deallocated after the completion has been signaled. | ||
| 133 | * request has been submitted, | ||
| 134 | * @resp: Buffer to store the response. | ||
| 135 | * @status: Status of the request, set after the base request has been | ||
| 136 | * completed or has failed. | ||
| 137 | */ | ||
| 138 | struct ssam_request_sync { | ||
| 139 | struct ssh_request base; | ||
| 140 | struct completion comp; | ||
| 141 | struct ssam_response *resp; | ||
| 142 | int status; | ||
| 143 | }; | ||
| 144 | |||
| 145 | int ssam_request_sync_alloc(size_t payload_len, gfp_t flags, | ||
| 146 | struct ssam_request_sync **rqst, | ||
| 147 | struct ssam_span *buffer); | ||
| 148 | |||
| 149 | void ssam_request_sync_free(struct ssam_request_sync *rqst); | ||
| 150 | |||
| 151 | int ssam_request_sync_init(struct ssam_request_sync *rqst, | ||
| 152 | enum ssam_request_flags flags); | ||
| 153 | |||
| 154 | /** | ||
| 155 | * ssam_request_sync_set_data - Set message data of a synchronous request. | ||
| 156 | * @rqst: The request. | ||
| 157 | * @ptr: Pointer to the request message data. | ||
| 158 | * @len: Length of the request message data. | ||
| 159 | * | ||
| 160 | * Set the request message data of a synchronous request. The provided buffer | ||
| 161 | * needs to live until the request has been completed. | ||
| 162 | */ | ||
| 163 | static inline void ssam_request_sync_set_data(struct ssam_request_sync *rqst, | ||
| 164 | u8 *ptr, size_t len) | ||
| 165 | { | ||
| 166 | ssh_request_set_data(&rqst->base, ptr, len); | ||
| 167 | } | ||
| 168 | |||
| 169 | /** | ||
| 170 | * ssam_request_sync_set_resp - Set response buffer of a synchronous request. | ||
| 171 | * @rqst: The request. | ||
| 172 | * @resp: The response buffer. | ||
| 173 | * | ||
| 174 | * Sets the response buffer of a synchronous request. This buffer will store | ||
| 175 | * the response of the request after it has been completed. May be %NULL if no | ||
| 176 | * response is expected. | ||
| 177 | */ | ||
| 178 | static inline void ssam_request_sync_set_resp(struct ssam_request_sync *rqst, | ||
| 179 | struct ssam_response *resp) | ||
| 180 | { | ||
| 181 | rqst->resp = resp; | ||
| 182 | } | ||
| 183 | |||
| 184 | int ssam_request_sync_submit(struct ssam_controller *ctrl, | ||
| 185 | struct ssam_request_sync *rqst); | ||
| 186 | |||
| 187 | /** | ||
| 188 | * ssam_request_sync_wait - Wait for completion of a synchronous request. | ||
| 189 | * @rqst: The request to wait for. | ||
| 190 | * | ||
| 191 | * Wait for completion and release of a synchronous request. After this | ||
| 192 | * function terminates, the request is guaranteed to have left the transport | ||
| 193 | * system. After successful submission of a request, this function must be | ||
| 194 | * called before accessing the response of the request, freeing the request, | ||
| 195 | * or freeing any of the buffers associated with the request. | ||
| 196 | * | ||
| 197 | * This function must not be called if the request has not been submitted yet | ||
| 198 | * and may lead to a deadlock/infinite wait if a subsequent request submission | ||
| 199 | * fails in that case, due to the completion never triggering. | ||
| 200 | * | ||
| 201 | * Return: Returns the status of the given request, which is set on completion | ||
| 202 | * of the packet. This value is zero on success and negative on failure. | ||
| 203 | */ | ||
| 204 | static inline int ssam_request_sync_wait(struct ssam_request_sync *rqst) | ||
| 205 | { | ||
| 206 | wait_for_completion(&rqst->comp); | ||
| 207 | return rqst->status; | ||
| 208 | } | ||
| 209 | |||
| 210 | int ssam_request_sync(struct ssam_controller *ctrl, | ||
| 211 | const struct ssam_request *spec, | ||
| 212 | struct ssam_response *rsp); | ||
| 213 | |||
| 214 | int ssam_request_sync_with_buffer(struct ssam_controller *ctrl, | ||
| 215 | const struct ssam_request *spec, | ||
| 216 | struct ssam_response *rsp, | ||
| 217 | struct ssam_span *buf); | ||
| 218 | |||
| 219 | /** | ||
| 220 | * ssam_request_sync_onstack - Execute a synchronous request on the stack. | ||
| 221 | * @ctrl: The controller via which the request is submitted. | ||
| 222 | * @rqst: The request specification. | ||
| 223 | * @rsp: The response buffer. | ||
| 224 | * @payload_len: The (maximum) request payload length. | ||
| 225 | * | ||
| 226 | * Allocates a synchronous request with specified payload length on the stack, | ||
| 227 | * fully initializes it via the provided request specification, submits it, | ||
| 228 | * and finally waits for its completion before returning its status. This | ||
| 229 | * helper macro essentially allocates the request message buffer on the stack | ||
| 230 | * and then calls ssam_request_sync_with_buffer(). | ||
| 231 | * | ||
| 232 | * Note: The @payload_len parameter specifies the maximum payload length, used | ||
| 233 | * for buffer allocation. The actual payload length may be smaller. | ||
| 234 | * | ||
| 235 | * Return: Returns the status of the request or any failure during setup, i.e. | ||
| 236 | * zero on success and a negative value on failure. | ||
| 237 | */ | ||
| 238 | #define ssam_request_sync_onstack(ctrl, rqst, rsp, payload_len) \ | ||
| 239 | ({ \ | ||
| 240 | u8 __data[SSH_COMMAND_MESSAGE_LENGTH(payload_len)]; \ | ||
| 241 | struct ssam_span __buf = { &__data[0], ARRAY_SIZE(__data) }; \ | ||
| 242 | \ | ||
| 243 | ssam_request_sync_with_buffer(ctrl, rqst, rsp, &__buf); \ | ||
| 244 | }) | ||
| 245 | |||
| 246 | /** | ||
| 247 | * __ssam_retry - Retry request in case of I/O errors or timeouts. | ||
| 248 | * @request: The request function to execute. Must return an integer. | ||
| 249 | * @n: Number of tries. | ||
| 250 | * @args: Arguments for the request function. | ||
| 251 | * | ||
| 252 | * Executes the given request function, i.e. calls @request. In case the | ||
| 253 | * request returns %-EREMOTEIO (indicates I/O error) or %-ETIMEDOUT (request | ||
| 254 | * or underlying packet timed out), @request will be re-executed again, up to | ||
| 255 | * @n times in total. | ||
| 256 | * | ||
| 257 | * Return: Returns the return value of the last execution of @request. | ||
| 258 | */ | ||
| 259 | #define __ssam_retry(request, n, args...) \ | ||
| 260 | ({ \ | ||
| 261 | int __i, __s = 0; \ | ||
| 262 | \ | ||
| 263 | for (__i = (n); __i > 0; __i--) { \ | ||
| 264 | __s = request(args); \ | ||
| 265 | if (__s != -ETIMEDOUT && __s != -EREMOTEIO) \ | ||
| 266 | break; \ | ||
| 267 | } \ | ||
| 268 | __s; \ | ||
| 269 | }) | ||
| 270 | |||
| 271 | /** | ||
| 272 | * ssam_retry - Retry request in case of I/O errors or timeouts up to three | ||
| 273 | * times in total. | ||
| 274 | * @request: The request function to execute. Must return an integer. | ||
| 275 | * @args: Arguments for the request function. | ||
| 276 | * | ||
| 277 | * Executes the given request function, i.e. calls @request. In case the | ||
| 278 | * request returns %-EREMOTEIO (indicates I/O error) or -%ETIMEDOUT (request | ||
| 279 | * or underlying packet timed out), @request will be re-executed again, up to | ||
| 280 | * three times in total. | ||
| 281 | * | ||
| 282 | * See __ssam_retry() for a more generic macro for this purpose. | ||
| 283 | * | ||
| 284 | * Return: Returns the return value of the last execution of @request. | ||
| 285 | */ | ||
| 286 | #define ssam_retry(request, args...) \ | ||
| 287 | __ssam_retry(request, 3, args) | ||
| 288 | |||
| 289 | /** | ||
| 290 | * struct ssam_request_spec - Blue-print specification of SAM request. | ||
| 291 | * @target_category: Category of the request's target. See &enum ssam_ssh_tc. | ||
| 292 | * @target_id: ID of the request's target. | ||
| 293 | * @command_id: Command ID of the request. | ||
| 294 | * @instance_id: Instance ID of the request's target. | ||
| 295 | * @flags: Flags for the request. See &enum ssam_request_flags. | ||
| 296 | * | ||
| 297 | * Blue-print specification for a SAM request. This struct describes the | ||
| 298 | * unique static parameters of a request (i.e. type) without specifying any of | ||
| 299 | * its instance-specific data (e.g. payload). It is intended to be used as base | ||
| 300 | * for defining simple request functions via the | ||
| 301 | * ``SSAM_DEFINE_SYNC_REQUEST_x()`` family of macros. | ||
| 302 | */ | ||
| 303 | struct ssam_request_spec { | ||
| 304 | u8 target_category; | ||
| 305 | u8 target_id; | ||
| 306 | u8 command_id; | ||
| 307 | u8 instance_id; | ||
| 308 | u8 flags; | ||
| 309 | }; | ||
| 310 | |||
| 311 | /** | ||
| 312 | * struct ssam_request_spec_md - Blue-print specification for multi-device SAM | ||
| 313 | * request. | ||
| 314 | * @target_category: Category of the request's target. See &enum ssam_ssh_tc. | ||
| 315 | * @command_id: Command ID of the request. | ||
| 316 | * @flags: Flags for the request. See &enum ssam_request_flags. | ||
| 317 | * | ||
| 318 | * Blue-print specification for a multi-device SAM request, i.e. a request | ||
| 319 | * that is applicable to multiple device instances, described by their | ||
| 320 | * individual target and instance IDs. This struct describes the unique static | ||
| 321 | * parameters of a request (i.e. type) without specifying any of its | ||
| 322 | * instance-specific data (e.g. payload) and without specifying any of its | ||
| 323 | * device specific IDs (i.e. target and instance ID). It is intended to be | ||
| 324 | * used as base for defining simple multi-device request functions via the | ||
| 325 | * ``SSAM_DEFINE_SYNC_REQUEST_MD_x()`` and ``SSAM_DEFINE_SYNC_REQUEST_CL_x()`` | ||
| 326 | * families of macros. | ||
| 327 | */ | ||
| 328 | struct ssam_request_spec_md { | ||
| 329 | u8 target_category; | ||
| 330 | u8 command_id; | ||
| 331 | u8 flags; | ||
| 332 | }; | ||
| 333 | |||
| 334 | /** | ||
| 335 | * SSAM_DEFINE_SYNC_REQUEST_N() - Define synchronous SAM request function | ||
| 336 | * with neither argument nor return value. | ||
| 337 | * @name: Name of the generated function. | ||
| 338 | * @spec: Specification (&struct ssam_request_spec) defining the request. | ||
| 339 | * | ||
| 340 | * Defines a function executing the synchronous SAM request specified by | ||
| 341 | * @spec, with the request having neither argument nor return value. The | ||
| 342 | * generated function takes care of setting up the request struct and buffer | ||
| 343 | * allocation, as well as execution of the request itself, returning once the | ||
| 344 | * request has been fully completed. The required transport buffer will be | ||
| 345 | * allocated on the stack. | ||
| 346 | * | ||
| 347 | * The generated function is defined as ``int name(struct ssam_controller | ||
| 348 | * *ctrl)``, returning the status of the request, which is zero on success and | ||
| 349 | * negative on failure. The ``ctrl`` parameter is the controller via which the | ||
| 350 | * request is being sent. | ||
| 351 | * | ||
| 352 | * Refer to ssam_request_sync_onstack() for more details on the behavior of | ||
| 353 | * the generated function. | ||
| 354 | */ | ||
| 355 | #define SSAM_DEFINE_SYNC_REQUEST_N(name, spec...) \ | ||
| 356 | int name(struct ssam_controller *ctrl) \ | ||
| 357 | { \ | ||
| 358 | struct ssam_request_spec s = (struct ssam_request_spec)spec; \ | ||
| 359 | struct ssam_request rqst; \ | ||
| 360 | \ | ||
| 361 | rqst.target_category = s.target_category; \ | ||
| 362 | rqst.target_id = s.target_id; \ | ||
| 363 | rqst.command_id = s.command_id; \ | ||
| 364 | rqst.instance_id = s.instance_id; \ | ||
| 365 | rqst.flags = s.flags; \ | ||
| 366 | rqst.length = 0; \ | ||
| 367 | rqst.payload = NULL; \ | ||
| 368 | \ | ||
| 369 | return ssam_request_sync_onstack(ctrl, &rqst, NULL, 0); \ | ||
| 370 | } | ||
| 371 | |||
| 372 | /** | ||
| 373 | * SSAM_DEFINE_SYNC_REQUEST_W() - Define synchronous SAM request function with | ||
| 374 | * argument. | ||
| 375 | * @name: Name of the generated function. | ||
| 376 | * @atype: Type of the request's argument. | ||
| 377 | * @spec: Specification (&struct ssam_request_spec) defining the request. | ||
| 378 | * | ||
| 379 | * Defines a function executing the synchronous SAM request specified by | ||
| 380 | * @spec, with the request taking an argument of type @atype and having no | ||
| 381 | * return value. The generated function takes care of setting up the request | ||
| 382 | * struct, buffer allocation, as well as execution of the request itself, | ||
| 383 | * returning once the request has been fully completed. The required transport | ||
| 384 | * buffer will be allocated on the stack. | ||
| 385 | * | ||
| 386 | * The generated function is defined as ``int name(struct ssam_controller | ||
| 387 | * *ctrl, const atype *arg)``, returning the status of the request, which is | ||
| 388 | * zero on success and negative on failure. The ``ctrl`` parameter is the | ||
| 389 | * controller via which the request is sent. The request argument is specified | ||
| 390 | * via the ``arg`` pointer. | ||
| 391 | * | ||
| 392 | * Refer to ssam_request_sync_onstack() for more details on the behavior of | ||
| 393 | * the generated function. | ||
| 394 | */ | ||
| 395 | #define SSAM_DEFINE_SYNC_REQUEST_W(name, atype, spec...) \ | ||
| 396 | int name(struct ssam_controller *ctrl, const atype *arg) \ | ||
| 397 | { \ | ||
| 398 | struct ssam_request_spec s = (struct ssam_request_spec)spec; \ | ||
| 399 | struct ssam_request rqst; \ | ||
| 400 | \ | ||
| 401 | rqst.target_category = s.target_category; \ | ||
| 402 | rqst.target_id = s.target_id; \ | ||
| 403 | rqst.command_id = s.command_id; \ | ||
| 404 | rqst.instance_id = s.instance_id; \ | ||
| 405 | rqst.flags = s.flags; \ | ||
| 406 | rqst.length = sizeof(atype); \ | ||
| 407 | rqst.payload = (u8 *)arg; \ | ||
| 408 | \ | ||
| 409 | return ssam_request_sync_onstack(ctrl, &rqst, NULL, \ | ||
| 410 | sizeof(atype)); \ | ||
| 411 | } | ||
| 412 | |||
| 413 | /** | ||
| 414 | * SSAM_DEFINE_SYNC_REQUEST_R() - Define synchronous SAM request function with | ||
| 415 | * return value. | ||
| 416 | * @name: Name of the generated function. | ||
| 417 | * @rtype: Type of the request's return value. | ||
| 418 | * @spec: Specification (&struct ssam_request_spec) defining the request. | ||
| 419 | * | ||
| 420 | * Defines a function executing the synchronous SAM request specified by | ||
| 421 | * @spec, with the request taking no argument but having a return value of | ||
| 422 | * type @rtype. The generated function takes care of setting up the request | ||
| 423 | * and response structs, buffer allocation, as well as execution of the | ||
| 424 | * request itself, returning once the request has been fully completed. The | ||
| 425 | * required transport buffer will be allocated on the stack. | ||
| 426 | * | ||
| 427 | * The generated function is defined as ``int name(struct ssam_controller | ||
| 428 | * *ctrl, rtype *ret)``, returning the status of the request, which is zero on | ||
| 429 | * success and negative on failure. The ``ctrl`` parameter is the controller | ||
| 430 | * via which the request is sent. The request's return value is written to the | ||
| 431 | * memory pointed to by the ``ret`` parameter. | ||
| 432 | * | ||
| 433 | * Refer to ssam_request_sync_onstack() for more details on the behavior of | ||
| 434 | * the generated function. | ||
| 435 | */ | ||
| 436 | #define SSAM_DEFINE_SYNC_REQUEST_R(name, rtype, spec...) \ | ||
| 437 | int name(struct ssam_controller *ctrl, rtype *ret) \ | ||
| 438 | { \ | ||
| 439 | struct ssam_request_spec s = (struct ssam_request_spec)spec; \ | ||
| 440 | struct ssam_request rqst; \ | ||
| 441 | struct ssam_response rsp; \ | ||
| 442 | int status; \ | ||
| 443 | \ | ||
| 444 | rqst.target_category = s.target_category; \ | ||
| 445 | rqst.target_id = s.target_id; \ | ||
| 446 | rqst.command_id = s.command_id; \ | ||
| 447 | rqst.instance_id = s.instance_id; \ | ||
| 448 | rqst.flags = s.flags | SSAM_REQUEST_HAS_RESPONSE; \ | ||
| 449 | rqst.length = 0; \ | ||
| 450 | rqst.payload = NULL; \ | ||
| 451 | \ | ||
| 452 | rsp.capacity = sizeof(rtype); \ | ||
| 453 | rsp.length = 0; \ | ||
| 454 | rsp.pointer = (u8 *)ret; \ | ||
| 455 | \ | ||
| 456 | status = ssam_request_sync_onstack(ctrl, &rqst, &rsp, 0); \ | ||
| 457 | if (status) \ | ||
| 458 | return status; \ | ||
| 459 | \ | ||
| 460 | if (rsp.length != sizeof(rtype)) { \ | ||
| 461 | struct device *dev = ssam_controller_device(ctrl); \ | ||
| 462 | dev_err(dev, \ | ||
| 463 | "rqst: invalid response length, expected %zu, got %zu (tc: %#04x, cid: %#04x)", \ | ||
| 464 | sizeof(rtype), rsp.length, rqst.target_category,\ | ||
| 465 | rqst.command_id); \ | ||
| 466 | return -EIO; \ | ||
| 467 | } \ | ||
| 468 | \ | ||
| 469 | return 0; \ | ||
| 470 | } | ||
| 471 | |||
| 472 | /** | ||
| 473 | * SSAM_DEFINE_SYNC_REQUEST_MD_N() - Define synchronous multi-device SAM | ||
| 474 | * request function with neither argument nor return value. | ||
| 475 | * @name: Name of the generated function. | ||
| 476 | * @spec: Specification (&struct ssam_request_spec_md) defining the request. | ||
| 477 | * | ||
| 478 | * Defines a function executing the synchronous SAM request specified by | ||
| 479 | * @spec, with the request having neither argument nor return value. Device | ||
| 480 | * specifying parameters are not hard-coded, but instead must be provided to | ||
| 481 | * the function. The generated function takes care of setting up the request | ||
| 482 | * struct, buffer allocation, as well as execution of the request itself, | ||
| 483 | * returning once the request has been fully completed. The required transport | ||
| 484 | * buffer will be allocated on the stack. | ||
| 485 | * | ||
| 486 | * The generated function is defined as ``int name(struct ssam_controller | ||
| 487 | * *ctrl, u8 tid, u8 iid)``, returning the status of the request, which is | ||
| 488 | * zero on success and negative on failure. The ``ctrl`` parameter is the | ||
| 489 | * controller via which the request is sent, ``tid`` the target ID for the | ||
| 490 | * request, and ``iid`` the instance ID. | ||
| 491 | * | ||
| 492 | * Refer to ssam_request_sync_onstack() for more details on the behavior of | ||
| 493 | * the generated function. | ||
| 494 | */ | ||
| 495 | #define SSAM_DEFINE_SYNC_REQUEST_MD_N(name, spec...) \ | ||
| 496 | int name(struct ssam_controller *ctrl, u8 tid, u8 iid) \ | ||
| 497 | { \ | ||
| 498 | struct ssam_request_spec_md s = (struct ssam_request_spec_md)spec; \ | ||
| 499 | struct ssam_request rqst; \ | ||
| 500 | \ | ||
| 501 | rqst.target_category = s.target_category; \ | ||
| 502 | rqst.target_id = tid; \ | ||
| 503 | rqst.command_id = s.command_id; \ | ||
| 504 | rqst.instance_id = iid; \ | ||
| 505 | rqst.flags = s.flags; \ | ||
| 506 | rqst.length = 0; \ | ||
| 507 | rqst.payload = NULL; \ | ||
| 508 | \ | ||
| 509 | return ssam_request_sync_onstack(ctrl, &rqst, NULL, 0); \ | ||
| 510 | } | ||
| 511 | |||
| 512 | /** | ||
| 513 | * SSAM_DEFINE_SYNC_REQUEST_MD_W() - Define synchronous multi-device SAM | ||
| 514 | * request function with argument. | ||
| 515 | * @name: Name of the generated function. | ||
| 516 | * @atype: Type of the request's argument. | ||
| 517 | * @spec: Specification (&struct ssam_request_spec_md) defining the request. | ||
| 518 | * | ||
| 519 | * Defines a function executing the synchronous SAM request specified by | ||
| 520 | * @spec, with the request taking an argument of type @atype and having no | ||
| 521 | * return value. Device specifying parameters are not hard-coded, but instead | ||
| 522 | * must be provided to the function. The generated function takes care of | ||
| 523 | * setting up the request struct, buffer allocation, as well as execution of | ||
| 524 | * the request itself, returning once the request has been fully completed. | ||
| 525 | * The required transport buffer will be allocated on the stack. | ||
| 526 | * | ||
| 527 | * The generated function is defined as ``int name(struct ssam_controller | ||
| 528 | * *ctrl, u8 tid, u8 iid, const atype *arg)``, returning the status of the | ||
| 529 | * request, which is zero on success and negative on failure. The ``ctrl`` | ||
| 530 | * parameter is the controller via which the request is sent, ``tid`` the | ||
| 531 | * target ID for the request, and ``iid`` the instance ID. The request argument | ||
| 532 | * is specified via the ``arg`` pointer. | ||
| 533 | * | ||
| 534 | * Refer to ssam_request_sync_onstack() for more details on the behavior of | ||
| 535 | * the generated function. | ||
| 536 | */ | ||
| 537 | #define SSAM_DEFINE_SYNC_REQUEST_MD_W(name, atype, spec...) \ | ||
| 538 | int name(struct ssam_controller *ctrl, u8 tid, u8 iid, const atype *arg)\ | ||
| 539 | { \ | ||
| 540 | struct ssam_request_spec_md s = (struct ssam_request_spec_md)spec; \ | ||
| 541 | struct ssam_request rqst; \ | ||
| 542 | \ | ||
| 543 | rqst.target_category = s.target_category; \ | ||
| 544 | rqst.target_id = tid; \ | ||
| 545 | rqst.command_id = s.command_id; \ | ||
| 546 | rqst.instance_id = iid; \ | ||
| 547 | rqst.flags = s.flags; \ | ||
| 548 | rqst.length = sizeof(atype); \ | ||
| 549 | rqst.payload = (u8 *)arg; \ | ||
| 550 | \ | ||
| 551 | return ssam_request_sync_onstack(ctrl, &rqst, NULL, \ | ||
| 552 | sizeof(atype)); \ | ||
| 553 | } | ||
| 554 | |||
| 555 | /** | ||
| 556 | * SSAM_DEFINE_SYNC_REQUEST_MD_R() - Define synchronous multi-device SAM | ||
| 557 | * request function with return value. | ||
| 558 | * @name: Name of the generated function. | ||
| 559 | * @rtype: Type of the request's return value. | ||
| 560 | * @spec: Specification (&struct ssam_request_spec_md) defining the request. | ||
| 561 | * | ||
| 562 | * Defines a function executing the synchronous SAM request specified by | ||
| 563 | * @spec, with the request taking no argument but having a return value of | ||
| 564 | * type @rtype. Device specifying parameters are not hard-coded, but instead | ||
| 565 | * must be provided to the function. The generated function takes care of | ||
| 566 | * setting up the request and response structs, buffer allocation, as well as | ||
| 567 | * execution of the request itself, returning once the request has been fully | ||
| 568 | * completed. The required transport buffer will be allocated on the stack. | ||
| 569 | * | ||
| 570 | * The generated function is defined as ``int name(struct ssam_controller | ||
| 571 | * *ctrl, u8 tid, u8 iid, rtype *ret)``, returning the status of the request, | ||
| 572 | * which is zero on success and negative on failure. The ``ctrl`` parameter is | ||
| 573 | * the controller via which the request is sent, ``tid`` the target ID for the | ||
| 574 | * request, and ``iid`` the instance ID. The request's return value is written | ||
| 575 | * to the memory pointed to by the ``ret`` parameter. | ||
| 576 | * | ||
| 577 | * Refer to ssam_request_sync_onstack() for more details on the behavior of | ||
| 578 | * the generated function. | ||
| 579 | */ | ||
| 580 | #define SSAM_DEFINE_SYNC_REQUEST_MD_R(name, rtype, spec...) \ | ||
| 581 | int name(struct ssam_controller *ctrl, u8 tid, u8 iid, rtype *ret) \ | ||
| 582 | { \ | ||
| 583 | struct ssam_request_spec_md s = (struct ssam_request_spec_md)spec; \ | ||
| 584 | struct ssam_request rqst; \ | ||
| 585 | struct ssam_response rsp; \ | ||
| 586 | int status; \ | ||
| 587 | \ | ||
| 588 | rqst.target_category = s.target_category; \ | ||
| 589 | rqst.target_id = tid; \ | ||
| 590 | rqst.command_id = s.command_id; \ | ||
| 591 | rqst.instance_id = iid; \ | ||
| 592 | rqst.flags = s.flags | SSAM_REQUEST_HAS_RESPONSE; \ | ||
| 593 | rqst.length = 0; \ | ||
| 594 | rqst.payload = NULL; \ | ||
| 595 | \ | ||
| 596 | rsp.capacity = sizeof(rtype); \ | ||
| 597 | rsp.length = 0; \ | ||
| 598 | rsp.pointer = (u8 *)ret; \ | ||
| 599 | \ | ||
| 600 | status = ssam_request_sync_onstack(ctrl, &rqst, &rsp, 0); \ | ||
| 601 | if (status) \ | ||
| 602 | return status; \ | ||
| 603 | \ | ||
| 604 | if (rsp.length != sizeof(rtype)) { \ | ||
| 605 | struct device *dev = ssam_controller_device(ctrl); \ | ||
| 606 | dev_err(dev, \ | ||
| 607 | "rqst: invalid response length, expected %zu, got %zu (tc: %#04x, cid: %#04x)", \ | ||
| 608 | sizeof(rtype), rsp.length, rqst.target_category,\ | ||
| 609 | rqst.command_id); \ | ||
| 610 | return -EIO; \ | ||
| 611 | } \ | ||
| 612 | \ | ||
| 613 | return 0; \ | ||
| 614 | } | ||
| 615 | |||
| 616 | |||
| 617 | /* -- Event notifier/callbacks. --------------------------------------------- */ | ||
| 618 | |||
| 619 | #define SSAM_NOTIF_STATE_SHIFT 2 | ||
| 620 | #define SSAM_NOTIF_STATE_MASK ((1 << SSAM_NOTIF_STATE_SHIFT) - 1) | ||
| 621 | |||
| 622 | /** | ||
| 623 | * enum ssam_notif_flags - Flags used in return values from SSAM notifier | ||
| 624 | * callback functions. | ||
| 625 | * | ||
| 626 | * @SSAM_NOTIF_HANDLED: | ||
| 627 | * Indicates that the notification has been handled. This flag should be | ||
| 628 | * set by the handler if the handler can act/has acted upon the event | ||
| 629 | * provided to it. This flag should not be set if the handler is not a | ||
| 630 | * primary handler intended for the provided event. | ||
| 631 | * | ||
| 632 | * If this flag has not been set by any handler after the notifier chain | ||
| 633 | * has been traversed, a warning will be emitted, stating that the event | ||
| 634 | * has not been handled. | ||
| 635 | * | ||
| 636 | * @SSAM_NOTIF_STOP: | ||
| 637 | * Indicates that the notifier traversal should stop. If this flag is | ||
| 638 | * returned from a notifier callback, notifier chain traversal will | ||
| 639 | * immediately stop and any remaining notifiers will not be called. This | ||
| 640 | * flag is automatically set when ssam_notifier_from_errno() is called | ||
| 641 | * with a negative error value. | ||
| 642 | */ | ||
| 643 | enum ssam_notif_flags { | ||
| 644 | SSAM_NOTIF_HANDLED = BIT(0), | ||
| 645 | SSAM_NOTIF_STOP = BIT(1), | ||
| 646 | }; | ||
| 647 | |||
| 648 | struct ssam_event_notifier; | ||
| 649 | |||
| 650 | typedef u32 (*ssam_notifier_fn_t)(struct ssam_event_notifier *nf, | ||
| 651 | const struct ssam_event *event); | ||
| 652 | |||
| 653 | /** | ||
| 654 | * struct ssam_notifier_block - Base notifier block for SSAM event | ||
| 655 | * notifications. | ||
| 656 | * @node: The node for the list of notifiers. | ||
| 657 | * @fn: The callback function of this notifier. This function takes the | ||
| 658 | * respective notifier block and event as input and should return | ||
| 659 | * a notifier value, which can either be obtained from the flags | ||
| 660 | * provided in &enum ssam_notif_flags, converted from a standard | ||
| 661 | * error value via ssam_notifier_from_errno(), or a combination of | ||
| 662 | * both (e.g. ``ssam_notifier_from_errno(e) | SSAM_NOTIF_HANDLED``). | ||
| 663 | * @priority: Priority value determining the order in which notifier callbacks | ||
| 664 | * will be called. A higher value means higher priority, i.e. the | ||
| 665 | * associated callback will be executed earlier than other (lower | ||
| 666 | * priority) callbacks. | ||
| 667 | */ | ||
| 668 | struct ssam_notifier_block { | ||
| 669 | struct list_head node; | ||
| 670 | ssam_notifier_fn_t fn; | ||
| 671 | int priority; | ||
| 672 | }; | ||
| 673 | |||
| 674 | /** | ||
| 675 | * ssam_notifier_from_errno() - Convert standard error value to notifier | ||
| 676 | * return code. | ||
| 677 | * @err: The error code to convert, must be negative (in case of failure) or | ||
| 678 | * zero (in case of success). | ||
| 679 | * | ||
| 680 | * Return: Returns the notifier return value obtained by converting the | ||
| 681 | * specified @err value. In case @err is negative, the %SSAM_NOTIF_STOP flag | ||
| 682 | * will be set, causing notifier call chain traversal to abort. | ||
| 683 | */ | ||
| 684 | static inline u32 ssam_notifier_from_errno(int err) | ||
| 685 | { | ||
| 686 | if (WARN_ON(err > 0) || err == 0) | ||
| 687 | return 0; | ||
| 688 | else | ||
| 689 | return ((-err) << SSAM_NOTIF_STATE_SHIFT) | SSAM_NOTIF_STOP; | ||
| 690 | } | ||
| 691 | |||
| 692 | /** | ||
| 693 | * ssam_notifier_to_errno() - Convert notifier return code to standard error | ||
| 694 | * value. | ||
| 695 | * @ret: The notifier return value to convert. | ||
| 696 | * | ||
| 697 | * Return: Returns the negative error value encoded in @ret or zero if @ret | ||
| 698 | * indicates success. | ||
| 699 | */ | ||
| 700 | static inline int ssam_notifier_to_errno(u32 ret) | ||
| 701 | { | ||
| 702 | return -(ret >> SSAM_NOTIF_STATE_SHIFT); | ||
| 703 | } | ||
| 704 | |||
| 705 | |||
| 706 | /* -- Event/notification registry. ------------------------------------------ */ | ||
| 707 | |||
| 708 | /** | ||
| 709 | * struct ssam_event_registry - Registry specification used for enabling events. | ||
| 710 | * @target_category: Target category for the event registry requests. | ||
| 711 | * @target_id: Target ID for the event registry requests. | ||
| 712 | * @cid_enable: Command ID for the event-enable request. | ||
| 713 | * @cid_disable: Command ID for the event-disable request. | ||
| 714 | * | ||
| 715 | * This struct describes a SAM event registry via the minimal collection of | ||
| 716 | * SAM IDs specifying the requests to use for enabling and disabling an event. | ||
| 717 | * The individual event to be enabled/disabled itself is specified via &struct | ||
| 718 | * ssam_event_id. | ||
| 719 | */ | ||
| 720 | struct ssam_event_registry { | ||
| 721 | u8 target_category; | ||
| 722 | u8 target_id; | ||
| 723 | u8 cid_enable; | ||
| 724 | u8 cid_disable; | ||
| 725 | }; | ||
| 726 | |||
| 727 | /** | ||
| 728 | * struct ssam_event_id - Unique event ID used for enabling events. | ||
| 729 | * @target_category: Target category of the event source. | ||
| 730 | * @instance: Instance ID of the event source. | ||
| 731 | * | ||
| 732 | * This struct specifies the event to be enabled/disabled via an externally | ||
| 733 | * provided registry. It does not specify the registry to be used itself, this | ||
| 734 | * is done via &struct ssam_event_registry. | ||
| 735 | */ | ||
| 736 | struct ssam_event_id { | ||
| 737 | u8 target_category; | ||
| 738 | u8 instance; | ||
| 739 | }; | ||
| 740 | |||
| 741 | /** | ||
| 742 | * enum ssam_event_mask - Flags specifying how events are matched to notifiers. | ||
| 743 | * | ||
| 744 | * @SSAM_EVENT_MASK_NONE: | ||
| 745 | * Run the callback for any event with matching target category. Do not | ||
| 746 | * do any additional filtering. | ||
| 747 | * | ||
| 748 | * @SSAM_EVENT_MASK_TARGET: | ||
| 749 | * In addition to filtering by target category, only execute the notifier | ||
| 750 | * callback for events with a target ID matching to the one of the | ||
| 751 | * registry used for enabling/disabling the event. | ||
| 752 | * | ||
| 753 | * @SSAM_EVENT_MASK_INSTANCE: | ||
| 754 | * In addition to filtering by target category, only execute the notifier | ||
| 755 | * callback for events with an instance ID matching to the instance ID | ||
| 756 | * used when enabling the event. | ||
| 757 | * | ||
| 758 | * @SSAM_EVENT_MASK_STRICT: | ||
| 759 | * Do all the filtering above. | ||
| 760 | */ | ||
| 761 | enum ssam_event_mask { | ||
| 762 | SSAM_EVENT_MASK_TARGET = BIT(0), | ||
| 763 | SSAM_EVENT_MASK_INSTANCE = BIT(1), | ||
| 764 | |||
| 765 | SSAM_EVENT_MASK_NONE = 0, | ||
| 766 | SSAM_EVENT_MASK_STRICT = | ||
| 767 | SSAM_EVENT_MASK_TARGET | ||
| 768 | | SSAM_EVENT_MASK_INSTANCE, | ||
| 769 | }; | ||
| 770 | |||
| 771 | /** | ||
| 772 | * SSAM_EVENT_REGISTRY() - Define a new event registry. | ||
| 773 | * @tc: Target category for the event registry requests. | ||
| 774 | * @tid: Target ID for the event registry requests. | ||
| 775 | * @cid_en: Command ID for the event-enable request. | ||
| 776 | * @cid_dis: Command ID for the event-disable request. | ||
| 777 | * | ||
| 778 | * Return: Returns the &struct ssam_event_registry specified by the given | ||
| 779 | * parameters. | ||
| 780 | */ | ||
| 781 | #define SSAM_EVENT_REGISTRY(tc, tid, cid_en, cid_dis) \ | ||
| 782 | ((struct ssam_event_registry) { \ | ||
| 783 | .target_category = (tc), \ | ||
| 784 | .target_id = (tid), \ | ||
| 785 | .cid_enable = (cid_en), \ | ||
| 786 | .cid_disable = (cid_dis), \ | ||
| 787 | }) | ||
| 788 | |||
| 789 | #define SSAM_EVENT_REGISTRY_SAM \ | ||
| 790 | SSAM_EVENT_REGISTRY(SSAM_SSH_TC_SAM, 0x01, 0x0b, 0x0c) | ||
| 791 | |||
| 792 | #define SSAM_EVENT_REGISTRY_KIP \ | ||
| 793 | SSAM_EVENT_REGISTRY(SSAM_SSH_TC_KIP, 0x02, 0x27, 0x28) | ||
| 794 | |||
| 795 | #define SSAM_EVENT_REGISTRY_REG \ | ||
| 796 | SSAM_EVENT_REGISTRY(SSAM_SSH_TC_REG, 0x02, 0x01, 0x02) | ||
| 797 | |||
| 798 | /** | ||
| 799 | * struct ssam_event_notifier - Notifier block for SSAM events. | ||
| 800 | * @base: The base notifier block with callback function and priority. | ||
| 801 | * @event: The event for which this block will receive notifications. | ||
| 802 | * @event.reg: Registry via which the event will be enabled/disabled. | ||
| 803 | * @event.id: ID specifying the event. | ||
| 804 | * @event.mask: Flags determining how events are matched to the notifier. | ||
| 805 | * @event.flags: Flags used for enabling the event. | ||
| 806 | */ | ||
| 807 | struct ssam_event_notifier { | ||
| 808 | struct ssam_notifier_block base; | ||
| 809 | |||
| 810 | struct { | ||
| 811 | struct ssam_event_registry reg; | ||
| 812 | struct ssam_event_id id; | ||
| 813 | enum ssam_event_mask mask; | ||
| 814 | u8 flags; | ||
| 815 | } event; | ||
| 816 | }; | ||
| 817 | |||
| 818 | int ssam_notifier_register(struct ssam_controller *ctrl, | ||
| 819 | struct ssam_event_notifier *n); | ||
| 820 | |||
| 821 | int ssam_notifier_unregister(struct ssam_controller *ctrl, | ||
| 822 | struct ssam_event_notifier *n); | ||
| 823 | |||
| 824 | #endif /* _LINUX_SURFACE_AGGREGATOR_CONTROLLER_H */ | ||
| @@ -0,0 +1,423 @@ | |||
| 1 | /* SPDX-License-Identifier: GPL-2.0+ */ | ||
| 2 | /* | ||
| 3 | * Surface System Aggregator Module (SSAM) bus and client-device subsystem. | ||
| 4 | * | ||
| 5 | * Main interface for the surface-aggregator bus, surface-aggregator client | ||
| 6 | * devices, and respective drivers building on top of the SSAM controller. | ||
| 7 | * Provides support for non-platform/non-ACPI SSAM clients via dedicated | ||
| 8 | * subsystem. | ||
| 9 | * | ||
| 10 | * Copyright (C) 2019-2020 Maximilian Luz <luzmaximilian@gmail.com> | ||
| 11 | */ | ||
| 12 | |||
| 13 | #ifndef _LINUX_SURFACE_AGGREGATOR_DEVICE_H | ||
| 14 | #define _LINUX_SURFACE_AGGREGATOR_DEVICE_H | ||
| 15 | |||
| 16 | #include <linux/device.h> | ||
| 17 | #include <linux/mod_devicetable.h> | ||
| 18 | #include <linux/types.h> | ||
| 19 | |||
| 20 | #include <linux/surface_aggregator/controller.h> | ||
| 21 | |||
| 22 | |||
| 23 | /* -- Surface System Aggregator Module bus. --------------------------------- */ | ||
| 24 | |||
| 25 | /** | ||
| 26 | * enum ssam_device_domain - SAM device domain. | ||
| 27 | * @SSAM_DOMAIN_VIRTUAL: Virtual device. | ||
| 28 | * @SSAM_DOMAIN_SERIALHUB: Physical device connected via Surface Serial Hub. | ||
| 29 | */ | ||
| 30 | enum ssam_device_domain { | ||
| 31 | SSAM_DOMAIN_VIRTUAL = 0x00, | ||
| 32 | SSAM_DOMAIN_SERIALHUB = 0x01, | ||
| 33 | }; | ||
| 34 | |||
| 35 | /** | ||
| 36 | * enum ssam_virtual_tc - Target categories for the virtual SAM domain. | ||
| 37 | * @SSAM_VIRTUAL_TC_HUB: Device hub category. | ||
| 38 | */ | ||
| 39 | enum ssam_virtual_tc { | ||
| 40 | SSAM_VIRTUAL_TC_HUB = 0x00, | ||
| 41 | }; | ||
| 42 | |||
| 43 | /** | ||
| 44 | * struct ssam_device_uid - Unique identifier for SSAM device. | ||
| 45 | * @domain: Domain of the device. | ||
| 46 | * @category: Target category of the device. | ||
| 47 | * @target: Target ID of the device. | ||
| 48 | * @instance: Instance ID of the device. | ||
| 49 | * @function: Sub-function of the device. This field can be used to split a | ||
| 50 | * single SAM device into multiple virtual subdevices to separate | ||
| 51 | * different functionality of that device and allow one driver per | ||
| 52 | * such functionality. | ||
| 53 | */ | ||
| 54 | struct ssam_device_uid { | ||
| 55 | u8 domain; | ||
| 56 | u8 category; | ||
| 57 | u8 target; | ||
| 58 | u8 instance; | ||
| 59 | u8 function; | ||
| 60 | }; | ||
| 61 | |||
| 62 | /* | ||
| 63 | * Special values for device matching. | ||
| 64 | * | ||
| 65 | * These values are intended to be used with SSAM_DEVICE(), SSAM_VDEV(), and | ||
| 66 | * SSAM_SDEV() exclusively. Specifically, they are used to initialize the | ||
| 67 | * match_flags member of the device ID structure. Do not use them directly | ||
| 68 | * with struct ssam_device_id or struct ssam_device_uid. | ||
| 69 | */ | ||
| 70 | #define SSAM_ANY_TID 0xffff | ||
| 71 | #define SSAM_ANY_IID 0xffff | ||
| 72 | #define SSAM_ANY_FUN 0xffff | ||
| 73 | |||
| 74 | /** | ||
| 75 | * SSAM_DEVICE() - Initialize a &struct ssam_device_id with the given | ||
| 76 | * parameters. | ||
| 77 | * @d: Domain of the device. | ||
| 78 | * @cat: Target category of the device. | ||
| 79 | * @tid: Target ID of the device. | ||
| 80 | * @iid: Instance ID of the device. | ||
| 81 | * @fun: Sub-function of the device. | ||
| 82 | * | ||
| 83 | * Initializes a &struct ssam_device_id with the given parameters. See &struct | ||
| 84 | * ssam_device_uid for details regarding the parameters. The special values | ||
| 85 | * %SSAM_ANY_TID, %SSAM_ANY_IID, and %SSAM_ANY_FUN can be used to specify that | ||
| 86 | * matching should ignore target ID, instance ID, and/or sub-function, | ||
| 87 | * respectively. This macro initializes the ``match_flags`` field based on the | ||
| 88 | * given parameters. | ||
| 89 | * | ||
| 90 | * Note: The parameters @d and @cat must be valid &u8 values, the parameters | ||
| 91 | * @tid, @iid, and @fun must be either valid &u8 values or %SSAM_ANY_TID, | ||
| 92 | * %SSAM_ANY_IID, or %SSAM_ANY_FUN, respectively. Other non-&u8 values are not | ||
| 93 | * allowed. | ||
| 94 | */ | ||
| 95 | #define SSAM_DEVICE(d, cat, tid, iid, fun) \ | ||
| 96 | .match_flags = (((tid) != SSAM_ANY_TID) ? SSAM_MATCH_TARGET : 0) \ | ||
| 97 | | (((iid) != SSAM_ANY_IID) ? SSAM_MATCH_INSTANCE : 0) \ | ||
| 98 | | (((fun) != SSAM_ANY_FUN) ? SSAM_MATCH_FUNCTION : 0), \ | ||
| 99 | .domain = d, \ | ||
| 100 | .category = cat, \ | ||
| 101 | .target = ((tid) != SSAM_ANY_TID) ? (tid) : 0, \ | ||
| 102 | .instance = ((iid) != SSAM_ANY_IID) ? (iid) : 0, \ | ||
| 103 | .function = ((fun) != SSAM_ANY_FUN) ? (fun) : 0 \ | ||
| 104 | |||
| 105 | /** | ||
| 106 | * SSAM_VDEV() - Initialize a &struct ssam_device_id as virtual device with | ||
| 107 | * the given parameters. | ||
| 108 | * @cat: Target category of the device. | ||
| 109 | * @tid: Target ID of the device. | ||
| 110 | * @iid: Instance ID of the device. | ||
| 111 | * @fun: Sub-function of the device. | ||
| 112 | * | ||
| 113 | * Initializes a &struct ssam_device_id with the given parameters in the | ||
| 114 | * virtual domain. See &struct ssam_device_uid for details regarding the | ||
| 115 | * parameters. The special values %SSAM_ANY_TID, %SSAM_ANY_IID, and | ||
| 116 | * %SSAM_ANY_FUN can be used to specify that matching should ignore target ID, | ||
| 117 | * instance ID, and/or sub-function, respectively. This macro initializes the | ||
| 118 | * ``match_flags`` field based on the given parameters. | ||
| 119 | * | ||
| 120 | * Note: The parameter @cat must be a valid &u8 value, the parameters @tid, | ||
| 121 | * @iid, and @fun must be either valid &u8 values or %SSAM_ANY_TID, | ||
| 122 | * %SSAM_ANY_IID, or %SSAM_ANY_FUN, respectively. Other non-&u8 values are not | ||
| 123 | * allowed. | ||
| 124 | */ | ||
| 125 | #define SSAM_VDEV(cat, tid, iid, fun) \ | ||
| 126 | SSAM_DEVICE(SSAM_DOMAIN_VIRTUAL, SSAM_VIRTUAL_TC_##cat, tid, iid, fun) | ||
| 127 | |||
| 128 | /** | ||
| 129 | * SSAM_SDEV() - Initialize a &struct ssam_device_id as physical SSH device | ||
| 130 | * with the given parameters. | ||
| 131 | * @cat: Target category of the device. | ||
| 132 | * @tid: Target ID of the device. | ||
| 133 | * @iid: Instance ID of the device. | ||
| 134 | * @fun: Sub-function of the device. | ||
| 135 | * | ||
| 136 | * Initializes a &struct ssam_device_id with the given parameters in the SSH | ||
| 137 | * domain. See &struct ssam_device_uid for details regarding the parameters. | ||
| 138 | * The special values %SSAM_ANY_TID, %SSAM_ANY_IID, and %SSAM_ANY_FUN can be | ||
| 139 | * used to specify that matching should ignore target ID, instance ID, and/or | ||
| 140 | * sub-function, respectively. This macro initializes the ``match_flags`` | ||
| 141 | * field based on the given parameters. | ||
| 142 | * | ||
| 143 | * Note: The parameter @cat must be a valid &u8 value, the parameters @tid, | ||
| 144 | * @iid, and @fun must be either valid &u8 values or %SSAM_ANY_TID, | ||
| 145 | * %SSAM_ANY_IID, or %SSAM_ANY_FUN, respectively. Other non-&u8 values are not | ||
| 146 | * allowed. | ||
| 147 | */ | ||
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