// SPDX-License-Identifier: GPL-2.0-or-later/* * dock.c - ACPI dock station driver * * Copyright (C) 2006, 2014, Intel Corp. * Author: Kristen Carlson Accardi <kristen.c.accardi@intel.com> * Rafael J. Wysocki <rafael.j.wysocki@intel.com> */ #include <linux/kernel.h>#include <linux/moduleparam.h>#include <linux/slab.h>#include <linux/init.h>#include <linux/types.h>#include <linux/notifier.h>#include <linux/platform_device.h>#include <linux/jiffies.h>#include <linux/stddef.h>#include <linux/acpi.h> #include "internal.h" static bool immediate_undock = 1;module_param(immediate_undock, bool, 0644);MODULE_PARM_DESC(immediate_undock, "1 (default) will cause the driver to " "undock immediately when the undock button is pressed, 0 will cause" " the driver to wait for userspace to write the undock sysfs file " " before undocking"); struct dock_station { acpi_handle handle; unsigned long last_dock_time; u32 flags; struct list_head dependent_devices; struct list_head sibling; struct platform_device *dock_device;};static LIST_HEAD(dock_stations);static int dock_station_count; struct dock_dependent_device { struct list_head list; struct acpi_device *adev;}; #define DOCK_DOCKING 0x00000001#define DOCK_UNDOCKING 0x00000002#define DOCK_IS_DOCK 0x00000010#define DOCK_IS_ATA 0x00000020#define DOCK_IS_BAT 0x00000040#define DOCK_EVENT 3#define UNDOCK_EVENT 2 enum dock_callback_type { DOCK_CALL_HANDLER, DOCK_CALL_FIXUP, DOCK_CALL_UEVENT,}; /***************************************************************************** * Dock Dependent device functions * *****************************************************************************//** * add_dock_dependent_device - associate a device with the dock station * @ds: Dock station. * @adev: Dependent ACPI device object. * * Add the dependent device to the dock's dependent device list. */static int add_dock_dependent_device(struct dock_station *ds, struct acpi_device *adev){ struct dock_dependent_device *dd; dd = kzalloc_obj(*dd); if (!dd) return -ENOMEM; dd->adev = adev; INIT_LIST_HEAD(&dd->list); list_add_tail(&dd->list, &ds->dependent_devices); return 0;} static void dock_hotplug_event(struct dock_dependent_device *dd, u32 event, enum dock_callback_type cb_type){ struct acpi_device *adev = dd->adev; acpi_hp_fixup fixup = NULL; acpi_hp_uevent uevent = NULL; acpi_hp_notify notify = NULL; acpi_lock_hp_context(); if (adev->hp) { if (cb_type == DOCK_CALL_FIXUP) fixup = adev->hp->fixup; else if (cb_type == DOCK_CALL_UEVENT) uevent = adev->hp->uevent; else notify = adev->hp->notify; } acpi_unlock_hp_context(); if (fixup) fixup(adev); else if (uevent) uevent(adev, event); else if (notify) notify(adev, event);} static struct dock_station *find_dock_station(acpi_handle handle){ struct dock_station *ds; list_for_each_entry(ds, &dock_stations, sibling) if (ds->handle == handle) return ds; return NULL;} /** * find_dock_dependent_device - get a device dependent on this dock * @ds: the dock station * @adev: ACPI device object to find. * * iterate over the dependent device list for this dock. If the * dependent device matches the handle, return. */static struct dock_dependent_device *find_dock_dependent_device(struct dock_station *ds, struct acpi_device *adev){ struct dock_dependent_device *dd; list_for_each_entry(dd, &ds->dependent_devices, list) if (adev == dd->adev) return dd; return NULL;} void register_dock_dependent_device(struct acpi_device *adev, acpi_handle dshandle){ struct dock_station *ds = find_dock_station(dshandle); if (ds && !find_dock_dependent_device(ds, adev)) add_dock_dependent_device(ds, adev);} /***************************************************************************** * Dock functions * *****************************************************************************/ /** * is_dock_device - see if a device is on a dock station * @adev: ACPI device object to check. * * If this device is either the dock station itself, * or is a device dependent on the dock station, then it * is a dock device */int is_dock_device(struct acpi_device *adev){ struct dock_station *dock_station; if (!dock_station_count) return 0; if (acpi_dock_match(adev->handle)) return 1; list_for_each_entry(dock_station, &dock_stations, sibling) if (find_dock_dependent_device(dock_station, adev)) return 1; return 0;}EXPORT_SYMBOL_GPL(is_dock_device); /** * dock_present - see if the dock station is present. * @ds: the dock station * * execute the _STA method. note that present does not * imply that we are docked. */static int dock_present(struct dock_station *ds){ unsigned long long sta; acpi_status status; if (ds) { status = acpi_evaluate_integer(ds->handle, "_STA", NULL, &sta); if (ACPI_SUCCESS(status) && sta) return 1; } return 0;} /** * hot_remove_dock_devices - Remove dock station devices. * @ds: Dock station. */static void hot_remove_dock_devices(struct dock_station *ds){ struct dock_dependent_device *dd; /* * Walk the list in reverse order so that devices that have been added * last are removed first (in case there are some indirect dependencies * between them). */ list_for_each_entry_reverse(dd, &ds->dependent_devices, list) dock_hotplug_event(dd, ACPI_NOTIFY_EJECT_REQUEST, DOCK_CALL_HANDLER); list_for_each_entry_reverse(dd, &ds->dependent_devices, list) acpi_bus_trim(dd->adev);} /** * hotplug_dock_devices - Insert devices on a dock station. * @ds: the dock station * @event: either bus check or device check request * * Some devices on the dock station need to have drivers called * to perform hotplug operations after a dock event has occurred. * Traverse the list of dock devices that have registered a * hotplug handler, and call the handler. */static void hotplug_dock_devices(struct dock_station *ds, u32 event){ struct dock_dependent_device *dd; /* Call driver specific post-dock fixups. */ list_for_each_entry(dd, &ds->dependent_devices, list) dock_hotplug_event(dd, event, DOCK_CALL_FIXUP); /* Call driver specific hotplug functions. */ list_for_each_entry(dd, &ds->dependent_devices, list) dock_hotplug_event(dd, event, DOCK_CALL_HANDLER); /* * Check if all devices have been enumerated already. If not, run * acpi_bus_scan() for them and that will cause scan handlers to be * attached to device objects or acpi_drivers to be stopped/started if * they are present. */ list_for_each_entry(dd, &ds->dependent_devices, list) { struct acpi_device *adev = dd->adev; if (!acpi_device_enumerated(adev)) { int ret = acpi_bus_scan(adev->handle); if (ret) dev_dbg(&adev->dev, "scan error %d\n", -ret); } }} static void dock_event(struct dock_station *ds, u32 event, int num){ struct device *dev = &ds->dock_device->dev; char event_string[13]; char *envp[] = { event_string, NULL }; struct dock_dependent_device *dd; if (num == UNDOCK_EVENT) sprintf(event_string, "EVENT=undock"); else sprintf(event_string, "EVENT=dock"); /* * Indicate that the status of the dock station has * changed. */ if (num == DOCK_EVENT) kobject_uevent_env(&dev->kobj, KOBJ_CHANGE, envp); list_for_each_entry(dd, &ds->dependent_devices, list) dock_hotplug_event(dd, event, DOCK_CALL_UEVENT); if (num != DOCK_EVENT) kobject_uevent_env(&dev->kobj, KOBJ_CHANGE, envp);} /** * handle_dock - handle a dock event * @ds: the dock station * @dock: to dock, or undock - that is the question * * Execute the _DCK method in response to an acpi event */static void handle_dock(struct dock_station *ds, int dock){ acpi_status status; struct acpi_object_list arg_list; union acpi_object arg; unsigned long long value; acpi_handle_info(ds->handle, "%s\n", dock ? "docking" : "undocking"); /* _DCK method has one argument */ arg_list.count = 1; arg_list.pointer = &arg; arg.type = ACPI_TYPE_INTEGER; arg.integer.value = dock; status = acpi_evaluate_integer(ds->handle, "_DCK", &arg_list, &value); if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) acpi_handle_err(ds->handle, "Failed to execute _DCK (0x%x)\n", status);} static inline void dock(struct dock_station *ds){ handle_dock(ds, 1);} static inline void undock(struct dock_station *ds){ handle_dock(ds, 0);} static inline void begin_dock(struct dock_station *ds){ ds->flags |= DOCK_DOCKING;} static inline void complete_dock(struct dock_station *ds){ ds->flags &= ~(DOCK_DOCKING); ds->last_dock_time = jiffies;} static inline void begin_undock(struct dock_station *ds){ ds->flags |= DOCK_UNDOCKING;} static inline void complete_undock(struct dock_station *ds){ ds->flags &= ~(DOCK_UNDOCKING);} /** * dock_in_progress - see if we are in the middle of handling a dock event * @ds: the dock station * * Sometimes while docking, false dock events can be sent to the driver * because good connections aren't made or some other reason. Ignore these * if we are in the middle of doing something. */static int dock_in_progress(struct dock_station *ds){ if ((ds->flags & DOCK_DOCKING) || time_before(jiffies, (ds->last_dock_time + HZ))) return 1; return 0;} /** * handle_eject_request - handle an undock request checking for error conditions * @ds: The dock station to undock. * @event: The ACPI event number associated with the undock request. * * Check to make sure the dock device is still present, then undock and * hotremove all the devices that may need removing. */static int handle_eject_request(struct dock_station *ds, u32 event){ if (dock_in_progress(ds)) return -EBUSY; /* * here we need to generate the undock * event prior to actually doing the undock * so that the device struct still exists. * Also, even send the dock event if the * device is not present anymore */ dock_event(ds, event, UNDOCK_EVENT); hot_remove_dock_devices(ds); undock(ds); acpi_evaluate_lck(ds->handle, 0); acpi_evaluate_ej0(ds->handle); if (dock_present(ds)) { acpi_handle_err(ds->handle, "Unable to undock!\n"); return -EBUSY; } complete_undock(ds); return 0;} /** * dock_notify - Handle ACPI dock notification. * @adev: Dock station's ACPI device object. * @event: Event code. * * If we are notified to dock, then check to see if the dock is * present and then dock. Notify all drivers of the dock event, * and then hotplug and devices that may need hotplugging. */int dock_notify(struct acpi_device *adev, u32 event){ acpi_handle handle = adev->handle; struct dock_station *ds = find_dock_station(handle); int surprise_removal = 0; if (!ds) return -ENODEV; /* * According to acpi spec 3.0a, if a DEVICE_CHECK notification * is sent and _DCK is present, it is assumed to mean an undock * request. */ if ((ds->flags & DOCK_IS_DOCK) && event == ACPI_NOTIFY_DEVICE_CHECK) event = ACPI_NOTIFY_EJECT_REQUEST; /* * dock station: BUS_CHECK - docked or surprise removal * DEVICE_CHECK - undocked * other device: BUS_CHECK/DEVICE_CHECK - added or surprise removal * * To simplify event handling, dock dependent device handler always * get ACPI_NOTIFY_BUS_CHECK/ACPI_NOTIFY_DEVICE_CHECK for add and * ACPI_NOTIFY_EJECT_REQUEST for removal */ switch (event) { case ACPI_NOTIFY_BUS_CHECK: case ACPI_NOTIFY_DEVICE_CHECK: if (!dock_in_progress(ds) && !acpi_device_enumerated(adev)) { begin_dock(ds); dock(ds); if (!dock_present(ds)) { acpi_handle_err(handle, "Unable to dock!\n"); complete_dock(ds); break; } hotplug_dock_devices(ds, event); complete_dock(ds); dock_event(ds, event, DOCK_EVENT); acpi_evaluate_lck(ds->handle, 1); acpi_update_all_gpes(); break; } if (dock_present(ds) || dock_in_progress(ds)) break; /* This is a surprise removal */ surprise_removal = 1; event = ACPI_NOTIFY_EJECT_REQUEST; /* Fall back */ fallthrough; case ACPI_NOTIFY_EJECT_REQUEST: begin_undock(ds); if ((immediate_undock && !(ds->flags & DOCK_IS_ATA)) || surprise_removal) handle_eject_request(ds, event); else dock_event(ds, event, UNDOCK_EVENT); break; } return 0;} /* * show_docked - read method for "docked" file in sysfs */static ssize_t docked_show(struct device *dev, struct device_attribute *attr, char *buf){ struct dock_station *dock_station = dev->platform_data; struct acpi_device *adev = acpi_fetch_acpi_dev(dock_station->handle); return sysfs_emit(buf, "%u\n", acpi_device_enumerated(adev));}static DEVICE_ATTR_RO(docked); /* * show_flags - read method for flags file in sysfs */static ssize_t flags_show(struct device *dev, struct device_attribute *attr, char *buf){ struct dock_station *dock_station = dev->platform_data; return sysfs_emit(buf, "%d\n", dock_station->flags); }static DEVICE_ATTR_RO(flags); /* * write_undock - write method for "undock" file in sysfsLines 1–500 of 634. 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// SPDX-License-Identifier: GPL-2.0-or-later /* * dock.c - ACPI dock station driver * * Copyright (C) 2006, 2014, Intel Corp. * Author: Kristen Carlson Accardi <kristen.c.accardi@intel.com> * Rafael J. Wysocki <rafael.j.wysocki@intel.com> */ #include <linux/kernel.h> #include <linux/moduleparam.h> #include <linux/slab.h> #include <linux/init.h> #include <linux/types.h> #include <linux/notifier.h> #include <linux/platform_device.h> #include <linux/jiffies.h> #include <linux/stddef.h> #include <linux/acpi.h> #include "internal.h" static bool immediate_undock = 1; module_param(immediate_undock, bool, 0644); MODULE_PARM_DESC(immediate_undock, "1 (default) will cause the driver to " "undock immediately when the undock button is pressed, 0 will cause" " the driver to wait for userspace to write the undock sysfs file " " before undocking"); struct dock_station { acpi_handle handle; unsigned long last_dock_time; u32 flags; struct list_head dependent_devices; struct list_head sibling; struct platform_device *dock_device; }; static LIST_HEAD(dock_stations); static int dock_station_count; struct dock_dependent_device { struct list_head list; struct acpi_device *adev; }; #define DOCK_DOCKING 0x00000001 #define DOCK_UNDOCKING 0x00000002 #define DOCK_IS_DOCK 0x00000010 #define DOCK_IS_ATA 0x00000020 #define DOCK_IS_BAT 0x00000040 #define DOCK_EVENT 3 #define UNDOCK_EVENT 2 enum dock_callback_type { DOCK_CALL_HANDLER, DOCK_CALL_FIXUP, DOCK_CALL_UEVENT, }; /***************************************************************************** * Dock Dependent device functions * *****************************************************************************/ /** * add_dock_dependent_device - associate a device with the dock station * @ds: Dock station. * @adev: Dependent ACPI device object. * * Add the dependent device to the dock's dependent device list. */ static int add_dock_dependent_device(struct dock_station *ds, struct acpi_device *adev) { struct dock_dependent_device *dd; dd = kzalloc_obj(*dd); if (!dd) return -ENOMEM; dd->adev = adev; INIT_LIST_HEAD(&dd->list); list_add_tail(&dd->list, &ds->dependent_devices); return 0; } static void dock_hotplug_event(struct dock_dependent_device *dd, u32 event, enum dock_callback_type cb_type) { struct acpi_device *adev = dd->adev; acpi_hp_fixup fixup = NULL; acpi_hp_uevent uevent = NULL; acpi_hp_notify notify = NULL; acpi_lock_hp_context(); if (adev->hp) { if (cb_type == DOCK_CALL_FIXUP) fixup = adev->hp->fixup; else if (cb_type == DOCK_CALL_UEVENT) uevent = adev->hp->uevent; else notify = adev->hp->notify; } acpi_unlock_hp_context(); if (fixup) fixup(adev); else if (uevent) uevent(adev, event); else if (notify) notify(adev, event); } static struct dock_station *find_dock_station(acpi_handle handle) { struct dock_station *ds; list_for_each_entry(ds, &dock_stations, sibling) if (ds->handle == handle) return ds; return NULL; } /** * find_dock_dependent_device - get a device dependent on this dock * @ds: the dock station * @adev: ACPI device object to find. * * iterate over the dependent device list for this dock. If the * dependent device matches the handle, return. */ static struct dock_dependent_device * find_dock_dependent_device(struct dock_station *ds, struct acpi_device *adev) { struct dock_dependent_device *dd; list_for_each_entry(dd, &ds->dependent_devices, list) if (adev == dd->adev) return dd; return NULL; } void register_dock_dependent_device(struct acpi_device *adev, acpi_handle dshandle) { struct dock_station *ds = find_dock_station(dshandle); if (ds && !find_dock_dependent_device(ds, adev)) add_dock_dependent_device(ds, adev); } /***************************************************************************** * Dock functions * *****************************************************************************/ /** * is_dock_device - see if a device is on a dock station * @adev: ACPI device object to check. * * If this device is either the dock station itself, * or is a device dependent on the dock station, then it * is a dock device */ int is_dock_device(struct acpi_device *adev) { struct dock_station *dock_station; if (!dock_station_count) return 0; if (acpi_dock_match(adev->handle)) return 1; list_for_each_entry(dock_station, &dock_stations, sibling) if (find_dock_dependent_device(dock_station, adev)) return 1; return 0; } EXPORT_SYMBOL_GPL(is_dock_device); /** * dock_present - see if the dock station is present. * @ds: the dock station * * execute the _STA method. note that present does not * imply that we are docked. */ static int dock_present(struct dock_station *ds) { unsigned long long sta; acpi_status status; if (ds) { status = acpi_evaluate_integer(ds->handle, "_STA", NULL, &sta); if (ACPI_SUCCESS(status) && sta) return 1; } return 0; } /** * hot_remove_dock_devices - Remove dock station devices. * @ds: Dock station. */ static void hot_remove_dock_devices(struct dock_station *ds) { struct dock_dependent_device *dd; /* * Walk the list in reverse order so that devices that have been added * last are removed first (in case there are some indirect dependencies * between them). */ list_for_each_entry_reverse(dd, &ds->dependent_devices, list) dock_hotplug_event(dd, ACPI_NOTIFY_EJECT_REQUEST, DOCK_CALL_HANDLER); list_for_each_entry_reverse(dd, &ds->dependent_devices, list) acpi_bus_trim(dd->adev); } /** * hotplug_dock_devices - Insert devices on a dock station. * @ds: the dock station * @event: either bus check or device check request * * Some devices on the dock station need to have drivers called * to perform hotplug operations after a dock event has occurred. * Traverse the list of dock devices that have registered a * hotplug handler, and call the handler. */ static void hotplug_dock_devices(struct dock_station *ds, u32 event) { struct dock_dependent_device *dd; /* Call driver specific post-dock fixups. */ list_for_each_entry(dd, &ds->dependent_devices, list) dock_hotplug_event(dd, event, DOCK_CALL_FIXUP); /* Call driver specific hotplug functions. */ list_for_each_entry(dd, &ds->dependent_devices, list) dock_hotplug_event(dd, event, DOCK_CALL_HANDLER); /* * Check if all devices have been enumerated already. If not, run * acpi_bus_scan() for them and that will cause scan handlers to be * attached to device objects or acpi_drivers to be stopped/started if * they are present. */ list_for_each_entry(dd, &ds->dependent_devices, list) { struct acpi_device *adev = dd->adev; if (!acpi_device_enumerated(adev)) { int ret = acpi_bus_scan(adev->handle); if (ret) dev_dbg(&adev->dev, "scan error %d\n", -ret); } } } static void dock_event(struct dock_station *ds, u32 event, int num) { struct device *dev = &ds->dock_device->dev; char event_string[13]; char *envp[] = { event_string, NULL }; struct dock_dependent_device *dd; if (num == UNDOCK_EVENT) sprintf(event_string, "EVENT=undock"); else sprintf(event_string, "EVENT=dock"); /* * Indicate that the status of the dock station has * changed. */ if (num == DOCK_EVENT) kobject_uevent_env(&dev->kobj, KOBJ_CHANGE, envp); list_for_each_entry(dd, &ds->dependent_devices, list) dock_hotplug_event(dd, event, DOCK_CALL_UEVENT); if (num != DOCK_EVENT) kobject_uevent_env(&dev->kobj, KOBJ_CHANGE, envp); } /** * handle_dock - handle a dock event * @ds: the dock station * @dock: to dock, or undock - that is the question * * Execute the _DCK method in response to an acpi event */ static void handle_dock(struct dock_station *ds, int dock) { acpi_status status; struct acpi_object_list arg_list; union acpi_object arg; unsigned long long value; acpi_handle_info(ds->handle, "%s\n", dock ? "docking" : "undocking"); /* _DCK method has one argument */ arg_list.count = 1; arg_list.pointer = &arg; arg.type = ACPI_TYPE_INTEGER; arg.integer.value = dock; status = acpi_evaluate_integer(ds->handle, "_DCK", &arg_list, &value); if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) acpi_handle_err(ds->handle, "Failed to execute _DCK (0x%x)\n", status); } static inline void dock(struct dock_station *ds) { handle_dock(ds, 1); } static inline void undock(struct dock_station *ds) { handle_dock(ds, 0); } static inline void begin_dock(struct dock_station *ds) { ds->flags |= DOCK_DOCKING; } static inline void complete_dock(struct dock_station *ds) { ds->flags &= ~(DOCK_DOCKING); ds->last_dock_time = jiffies; } static inline void begin_undock(struct dock_station *ds) { ds->flags |= DOCK_UNDOCKING; } static inline void complete_undock(struct dock_station *ds) { ds->flags &= ~(DOCK_UNDOCKING); } /** * dock_in_progress - see if we are in the middle of handling a dock event * @ds: the dock station * * Sometimes while docking, false dock events can be sent to the driver * because good connections aren't made or some other reason. Ignore these * if we are in the middle of doing something. */ static int dock_in_progress(struct dock_station *ds) { if ((ds->flags & DOCK_DOCKING) || time_before(jiffies, (ds->last_dock_time + HZ))) return 1; return 0; } /** * handle_eject_request - handle an undock request checking for error conditions * @ds: The dock station to undock. * @event: The ACPI event number associated with the undock request. * * Check to make sure the dock device is still present, then undock and * hotremove all the devices that may need removing. */ static int handle_eject_request(struct dock_station *ds, u32 event) { if (dock_in_progress(ds)) return -EBUSY; /* * here we need to generate the undock * event prior to actually doing the undock * so that the device struct still exists. * Also, even send the dock event if the * device is not present anymore */ dock_event(ds, event, UNDOCK_EVENT); hot_remove_dock_devices(ds); undock(ds); acpi_evaluate_lck(ds->handle, 0); acpi_evaluate_ej0(ds->handle); if (dock_present(ds)) { acpi_handle_err(ds->handle, "Unable to undock!\n"); return -EBUSY; } complete_undock(ds); return 0; } /** * dock_notify - Handle ACPI dock notification. * @adev: Dock station's ACPI device object. * @event: Event code. * * If we are notified to dock, then check to see if the dock is * present and then dock. Notify all drivers of the dock event, * and then hotplug and devices that may need hotplugging. */ int dock_notify(struct acpi_device *adev, u32 event) { acpi_handle handle = adev->handle; struct dock_station *ds = find_dock_station(handle); int surprise_removal = 0; if (!ds) return -ENODEV; /* * According to acpi spec 3.0a, if a DEVICE_CHECK notification * is sent and _DCK is present, it is assumed to mean an undock * request. */ if ((ds->flags & DOCK_IS_DOCK) && event == ACPI_NOTIFY_DEVICE_CHECK) event = ACPI_NOTIFY_EJECT_REQUEST; /* * dock station: BUS_CHECK - docked or surprise removal * DEVICE_CHECK - undocked * other device: BUS_CHECK/DEVICE_CHECK - added or surprise removal * * To simplify event handling, dock dependent device handler always * get ACPI_NOTIFY_BUS_CHECK/ACPI_NOTIFY_DEVICE_CHECK for add and * ACPI_NOTIFY_EJECT_REQUEST for removal */ switch (event) { case ACPI_NOTIFY_BUS_CHECK: case ACPI_NOTIFY_DEVICE_CHECK: if (!dock_in_progress(ds) && !acpi_device_enumerated(adev)) { begin_dock(ds); dock(ds); if (!dock_present(ds)) { acpi_handle_err(handle, "Unable to dock!\n"); complete_dock(ds); break; } hotplug_dock_devices(ds, event); complete_dock(ds); dock_event(ds, event, DOCK_EVENT); acpi_evaluate_lck(ds->handle, 1); acpi_update_all_gpes(); break; } if (dock_present(ds) || dock_in_progress(ds)) break; /* This is a surprise removal */ surprise_removal = 1; event = ACPI_NOTIFY_EJECT_REQUEST; /* Fall back */ fallthrough; case ACPI_NOTIFY_EJECT_REQUEST: begin_undock(ds); if ((immediate_undock && !(ds->flags & DOCK_IS_ATA)) || surprise_removal) handle_eject_request(ds, event); else dock_event(ds, event, UNDOCK_EVENT); break; } return 0; } /* * show_docked - read method for "docked" file in sysfs */ static ssize_t docked_show(struct device *dev, struct device_attribute *attr, char *buf) { struct dock_station *dock_station = dev->platform_data; struct acpi_device *adev = acpi_fetch_acpi_dev(dock_station->handle); return sysfs_emit(buf, "%u\n", acpi_device_enumerated(adev)); } static DEVICE_ATTR_RO(docked); /* * show_flags - read method for flags file in sysfs */ static ssize_t flags_show(struct device *dev, struct device_attribute *attr, char *buf) { struct dock_station *dock_station = dev->platform_data; return sysfs_emit(buf, "%d\n", dock_station->flags); } static DEVICE_ATTR_RO(flags); /* * write_undock - write method for "undock" file in sysfs