// SPDX-License-Identifier: GPL-2.0-or-later/* * Apple USB Touchpad (for post-February 2005 PowerBooks and MacBooks) driver * * Copyright (C) 2001-2004 Greg Kroah-Hartman (greg@kroah.com) * Copyright (C) 2005-2008 Johannes Berg (johannes@sipsolutions.net) * Copyright (C) 2005-2008 Stelian Pop (stelian@popies.net) * Copyright (C) 2005 Frank Arnold (frank@scirocco-5v-turbo.de) * Copyright (C) 2005 Peter Osterlund (petero2@telia.com) * Copyright (C) 2005 Michael Hanselmann (linux-kernel@hansmi.ch) * Copyright (C) 2006 Nicolas Boichat (nicolas@boichat.ch) * Copyright (C) 2007-2008 Sven Anders (anders@anduras.de) * * Thanks to Alex Harper <basilisk@foobox.net> for his inputs. */ #include <linux/kernel.h>#include <linux/errno.h>#include <linux/slab.h>#include <linux/module.h>#include <linux/usb/input.h> /* * Note: We try to keep the touchpad aspect ratio while still doing only * simple arithmetics: * 0 <= x <= (xsensors - 1) * xfact * 0 <= y <= (ysensors - 1) * yfact */struct atp_info { int xsensors; /* number of X sensors */ int xsensors_17; /* 17" models have more sensors */ int ysensors; /* number of Y sensors */ int xfact; /* X multiplication factor */ int yfact; /* Y multiplication factor */ int datalen; /* size of USB transfers */ void (*callback)(struct urb *); /* callback function */ int fuzz; /* fuzz touchpad generates */}; static void atp_complete_geyser_1_2(struct urb *urb);static void atp_complete_geyser_3_4(struct urb *urb); static const struct atp_info fountain_info = { .xsensors = 16, .xsensors_17 = 26, .ysensors = 16, .xfact = 64, .yfact = 43, .datalen = 81, .callback = atp_complete_geyser_1_2, .fuzz = 16,}; static const struct atp_info geyser1_info = { .xsensors = 16, .xsensors_17 = 26, .ysensors = 16, .xfact = 64, .yfact = 43, .datalen = 81, .callback = atp_complete_geyser_1_2, .fuzz = 16,}; static const struct atp_info geyser2_info = { .xsensors = 15, .xsensors_17 = 20, .ysensors = 9, .xfact = 64, .yfact = 43, .datalen = 64, .callback = atp_complete_geyser_1_2, .fuzz = 0,}; static const struct atp_info geyser3_info = { .xsensors = 20, .ysensors = 10, .xfact = 64, .yfact = 64, .datalen = 64, .callback = atp_complete_geyser_3_4, .fuzz = 0,}; static const struct atp_info geyser4_info = { .xsensors = 20, .ysensors = 10, .xfact = 64, .yfact = 64, .datalen = 64, .callback = atp_complete_geyser_3_4, .fuzz = 0,}; #define ATP_DEVICE(prod, info) \{ \ .match_flags = USB_DEVICE_ID_MATCH_DEVICE | \ USB_DEVICE_ID_MATCH_INT_CLASS | \ USB_DEVICE_ID_MATCH_INT_PROTOCOL, \ .idVendor = 0x05ac, /* Apple */ \ .idProduct = (prod), \ .bInterfaceClass = 0x03, \ .bInterfaceProtocol = 0x02, \ .driver_info = (unsigned long) &info, \} /* * Table of devices (Product IDs) that work with this driver. * (The names come from Info.plist in AppleUSBTrackpad.kext, * According to Info.plist Geyser IV is the same as Geyser III.) */ static const struct usb_device_id atp_table[] = { /* PowerBooks Feb 2005, iBooks G4 */ ATP_DEVICE(0x020e, fountain_info), /* FOUNTAIN ANSI */ ATP_DEVICE(0x020f, fountain_info), /* FOUNTAIN ISO */ ATP_DEVICE(0x030a, fountain_info), /* FOUNTAIN TP ONLY */ ATP_DEVICE(0x030b, geyser1_info), /* GEYSER 1 TP ONLY */ /* PowerBooks Oct 2005 */ ATP_DEVICE(0x0214, geyser2_info), /* GEYSER 2 ANSI */ ATP_DEVICE(0x0215, geyser2_info), /* GEYSER 2 ISO */ ATP_DEVICE(0x0216, geyser2_info), /* GEYSER 2 JIS */ /* Core Duo MacBook & MacBook Pro */ ATP_DEVICE(0x0217, geyser3_info), /* GEYSER 3 ANSI */ ATP_DEVICE(0x0218, geyser3_info), /* GEYSER 3 ISO */ ATP_DEVICE(0x0219, geyser3_info), /* GEYSER 3 JIS */ /* Core2 Duo MacBook & MacBook Pro */ ATP_DEVICE(0x021a, geyser4_info), /* GEYSER 4 ANSI */ ATP_DEVICE(0x021b, geyser4_info), /* GEYSER 4 ISO */ ATP_DEVICE(0x021c, geyser4_info), /* GEYSER 4 JIS */ /* Core2 Duo MacBook3,1 */ ATP_DEVICE(0x0229, geyser4_info), /* GEYSER 4 HF ANSI */ ATP_DEVICE(0x022a, geyser4_info), /* GEYSER 4 HF ISO */ ATP_DEVICE(0x022b, geyser4_info), /* GEYSER 4 HF JIS */ /* Terminating entry */ { }};MODULE_DEVICE_TABLE(usb, atp_table); /* maximum number of sensors */#define ATP_XSENSORS 26#define ATP_YSENSORS 16 /* * The largest possible bank of sensors with additional buffer of 4 extra values * on either side, for an array of smoothed sensor values. */#define ATP_SMOOTHSIZE 34 /* maximum pressure this driver will report */#define ATP_PRESSURE 300 /* * Threshold for the touchpad sensors. Any change less than ATP_THRESHOLD is * ignored. */#define ATP_THRESHOLD 5 /* * How far we'll bitshift our sensor values before averaging them. Mitigates * rounding errors. */#define ATP_SCALE 12 /* Geyser initialization constants */#define ATP_GEYSER_MODE_READ_REQUEST_ID 1#define ATP_GEYSER_MODE_WRITE_REQUEST_ID 9#define ATP_GEYSER_MODE_REQUEST_VALUE 0x300#define ATP_GEYSER_MODE_REQUEST_INDEX 0#define ATP_GEYSER_MODE_VENDOR_VALUE 0x04 /** * enum atp_status_bits - status bit meanings * * These constants represent the meaning of the status bits. * (only Geyser 3/4) * * @ATP_STATUS_BUTTON: The button was pressed * @ATP_STATUS_BASE_UPDATE: Update of the base values (untouched pad) * @ATP_STATUS_FROM_RESET: Reset previously performed */enum atp_status_bits { ATP_STATUS_BUTTON = BIT(0), ATP_STATUS_BASE_UPDATE = BIT(2), ATP_STATUS_FROM_RESET = BIT(4),}; /* Structure to hold all of our device specific stuff */struct atp { char phys[64]; struct usb_device *udev; /* usb device */ struct usb_interface *intf; /* usb interface */ struct urb *urb; /* usb request block */ u8 *data; /* transferred data */ struct input_dev *input; /* input dev */ const struct atp_info *info; /* touchpad model */ bool valid; /* are the samples valid? */ bool size_detect_done; bool overflow_warned; int fingers_old; /* last reported finger count */ int x_old; /* last reported x/y, */ int y_old; /* used for smoothing */ signed char xy_cur[ATP_XSENSORS + ATP_YSENSORS]; signed char xy_old[ATP_XSENSORS + ATP_YSENSORS]; int xy_acc[ATP_XSENSORS + ATP_YSENSORS]; int smooth[ATP_SMOOTHSIZE]; int smooth_tmp[ATP_SMOOTHSIZE]; int idlecount; /* number of empty packets */ struct work_struct work;}; #define dbg_dump(msg, tab) \ if (debug > 1) { \ int __i; \ printk(KERN_DEBUG "appletouch: %s", msg); \ for (__i = 0; __i < ATP_XSENSORS + ATP_YSENSORS; __i++) \ printk(" %02x", tab[__i]); \ printk("\n"); \ } #define dprintk(format, a...) \ do { \ if (debug) \ printk(KERN_DEBUG format, ##a); \ } while (0) MODULE_AUTHOR("Johannes Berg");MODULE_AUTHOR("Stelian Pop");MODULE_AUTHOR("Frank Arnold");MODULE_AUTHOR("Michael Hanselmann");MODULE_AUTHOR("Sven Anders");MODULE_DESCRIPTION("Apple PowerBook and MacBook USB touchpad driver");MODULE_LICENSE("GPL"); /* * Make the threshold a module parameter */static int threshold = ATP_THRESHOLD;module_param(threshold, int, 0644);MODULE_PARM_DESC(threshold, "Discard any change in data from a sensor" " (the trackpad has many of these sensors)" " less than this value."); static int debug;module_param(debug, int, 0644);MODULE_PARM_DESC(debug, "Activate debugging output"); /* * By default newer Geyser devices send standard USB HID mouse * packets (Report ID 2). This code changes device mode, so it * sends raw sensor reports (Report ID 5). */static int atp_geyser_init(struct atp *dev){ struct usb_device *udev = dev->udev; char *data; int size; int i; int ret; data = kmalloc(8, GFP_KERNEL); if (!data) { dev_err(&dev->intf->dev, "Out of memory\n"); return -ENOMEM; } size = usb_control_msg(udev, usb_rcvctrlpipe(udev, 0), ATP_GEYSER_MODE_READ_REQUEST_ID, USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_INTERFACE, ATP_GEYSER_MODE_REQUEST_VALUE, ATP_GEYSER_MODE_REQUEST_INDEX, data, 8, 5000); if (size != 8) { dprintk("atp_geyser_init: read error\n"); for (i = 0; i < 8; i++) dprintk("appletouch[%d]: %d\n", i, data[i]); dev_err(&dev->intf->dev, "Failed to read mode from device.\n"); ret = -EIO; goto out_free; } /* Apply the mode switch */ data[0] = ATP_GEYSER_MODE_VENDOR_VALUE; size = usb_control_msg(udev, usb_sndctrlpipe(udev, 0), ATP_GEYSER_MODE_WRITE_REQUEST_ID, USB_DIR_OUT | USB_TYPE_CLASS | USB_RECIP_INTERFACE, ATP_GEYSER_MODE_REQUEST_VALUE, ATP_GEYSER_MODE_REQUEST_INDEX, data, 8, 5000); if (size != 8) { dprintk("atp_geyser_init: write error\n"); for (i = 0; i < 8; i++) dprintk("appletouch[%d]: %d\n", i, data[i]); dev_err(&dev->intf->dev, "Failed to request geyser raw mode\n"); ret = -EIO; goto out_free; } ret = 0;out_free: kfree(data); return ret;} /* * Reinitialise the device. This usually stops stream of empty packets * coming from it. */static void atp_reinit(struct work_struct *work){ struct atp *dev = container_of(work, struct atp, work); int retval; dprintk("appletouch: putting appletouch to sleep (reinit)\n"); atp_geyser_init(dev); retval = usb_submit_urb(dev->urb, GFP_ATOMIC); if (retval) dev_err(&dev->intf->dev, "atp_reinit: usb_submit_urb failed with error %d\n", retval);} static int atp_calculate_abs(struct atp *dev, int offset, int nb_sensors, int fact, int *z, int *fingers){ int i, pass; /* * Use offset to point xy_sensors at the first value in dev->xy_acc * for whichever dimension we're looking at this particular go-round. */ int *xy_sensors = dev->xy_acc + offset; /* values to calculate mean */ int pcum = 0, psum = 0; int is_increasing = 0; *fingers = 0; for (i = 0; i < nb_sensors; i++) { if (xy_sensors[i] < threshold) { if (is_increasing) is_increasing = 0; /* * Makes the finger detection more versatile. For example, * two fingers with no gap will be detected. Also, my * tests show it less likely to have intermittent loss * of multiple finger readings while moving around (scrolling). * * Changes the multiple finger detection to counting humps on * sensors (transitions from nonincreasing to increasing) * instead of counting transitions from low sensors (no * finger reading) to high sensors (finger above * sensor) * * - Jason Parekh <jasonparekh@gmail.com> */ } else if (i < 1 || (!is_increasing && xy_sensors[i - 1] < xy_sensors[i])) { (*fingers)++; is_increasing = 1; } else if (i > 0 && (xy_sensors[i - 1] - xy_sensors[i] > threshold)) { is_increasing = 0; } } if (*fingers < 1) /* No need to continue if no fingers are found. */ return 0; /* * Use a smoothed version of sensor data for movement calculations, to * combat noise without needing to rely so heavily on a threshold. * This improves tracking. * * The smoothed array is bigger than the original so that the smoothing * doesn't result in edge values being truncated. */ memset(dev->smooth, 0, 4 * sizeof(dev->smooth[0])); /* Pull base values, scaled up to help avoid truncation errors. */ for (i = 0; i < nb_sensors; i++) dev->smooth[i + 4] = xy_sensors[i] << ATP_SCALE; memset(&dev->smooth[nb_sensors + 4], 0, 4 * sizeof(dev->smooth[0])); for (pass = 0; pass < 4; pass++) { /* Handle edge. */ dev->smooth_tmp[0] = (dev->smooth[0] + dev->smooth[1]) / 2; /* Average values with neighbors. */ for (i = 1; i < nb_sensors + 7; i++) dev->smooth_tmp[i] = (dev->smooth[i - 1] + dev->smooth[i] * 2 + dev->smooth[i + 1]) / 4; /* Handle other edge. */ dev->smooth_tmp[i] = (dev->smooth[i - 1] + dev->smooth[i]) / 2; memcpy(dev->smooth, dev->smooth_tmp, sizeof(dev->smooth)); } for (i = 0; i < nb_sensors + 8; i++) { /* * Skip values if they're small enough to be truncated to 0 * by scale. Mostly noise. */ if ((dev->smooth[i] >> ATP_SCALE) > 0) { pcum += dev->smooth[i] * i; psum += dev->smooth[i]; } } if (psum > 0) { *z = psum >> ATP_SCALE; /* Scale down pressure output. */ return pcum * fact / psum; } return 0;} static inline void atp_report_fingers(struct input_dev *input, int fingers){ input_report_key(input, BTN_TOOL_FINGER, fingers == 1); input_report_key(input, BTN_TOOL_DOUBLETAP, fingers == 2); input_report_key(input, BTN_TOOL_TRIPLETAP, fingers > 2);} /* Check URB status and for correct length of data package */ #define ATP_URB_STATUS_SUCCESS 0#define ATP_URB_STATUS_ERROR 1#define ATP_URB_STATUS_ERROR_FATAL 2 static int atp_status_check(struct urb *urb){ struct atp *dev = urb->context; struct usb_interface *intf = dev->intf; switch (urb->status) { case 0: /* success */ break; case -EOVERFLOW: if (!dev->overflow_warned) { dev_warn(&intf->dev, "appletouch: OVERFLOW with data length %d, actual length is %d\n", dev->info->datalen, dev->urb->actual_length); dev->overflow_warned = true; } fallthrough; case -ECONNRESET: case -ENOENT: case -ESHUTDOWN: /* This urb is terminated, clean up */ dev_dbg(&intf->dev, "atp_complete: urb shutting down with status: %d\n", urb->status); return ATP_URB_STATUS_ERROR_FATAL; default: dev_dbg(&intf->dev, "atp_complete: nonzero urb status received: %d\n", urb->status); return ATP_URB_STATUS_ERROR; } /* drop incomplete datasets */ if (dev->urb->actual_length != dev->info->datalen) { dprintk("appletouch: incomplete data package" " (first byte: %d, length: %d).\n", dev->data[0], dev->urb->actual_length); return ATP_URB_STATUS_ERROR; } return ATP_URB_STATUS_SUCCESS;} static void atp_detect_size(struct atp *dev){ int i; /* 17" Powerbooks have extra X sensors */ for (i = dev->info->xsensors; i < ATP_XSENSORS; i++) { if (dev->xy_cur[i]) { dev_info(&dev->intf->dev, "appletouch: 17\" model detected.\n"); input_set_abs_params(dev->input, ABS_X, 0, (dev->info->xsensors_17 - 1) *Lines 1–500 of 997. 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// SPDX-License-Identifier: GPL-2.0-or-later /* * Apple USB Touchpad (for post-February 2005 PowerBooks and MacBooks) driver * * Copyright (C) 2001-2004 Greg Kroah-Hartman (greg@kroah.com) * Copyright (C) 2005-2008 Johannes Berg (johannes@sipsolutions.net) * Copyright (C) 2005-2008 Stelian Pop (stelian@popies.net) * Copyright (C) 2005 Frank Arnold (frank@scirocco-5v-turbo.de) * Copyright (C) 2005 Peter Osterlund (petero2@telia.com) * Copyright (C) 2005 Michael Hanselmann (linux-kernel@hansmi.ch) * Copyright (C) 2006 Nicolas Boichat (nicolas@boichat.ch) * Copyright (C) 2007-2008 Sven Anders (anders@anduras.de) * * Thanks to Alex Harper <basilisk@foobox.net> for his inputs. */ #include <linux/kernel.h> #include <linux/errno.h> #include <linux/slab.h> #include <linux/module.h> #include <linux/usb/input.h> /* * Note: We try to keep the touchpad aspect ratio while still doing only * simple arithmetics: * 0 <= x <= (xsensors - 1) * xfact * 0 <= y <= (ysensors - 1) * yfact */ struct atp_info { int xsensors; /* number of X sensors */ int xsensors_17; /* 17" models have more sensors */ int ysensors; /* number of Y sensors */ int xfact; /* X multiplication factor */ int yfact; /* Y multiplication factor */ int datalen; /* size of USB transfers */ void (*callback)(struct urb *); /* callback function */ int fuzz; /* fuzz touchpad generates */ }; static void atp_complete_geyser_1_2(struct urb *urb); static void atp_complete_geyser_3_4(struct urb *urb); static const struct atp_info fountain_info = { .xsensors = 16, .xsensors_17 = 26, .ysensors = 16, .xfact = 64, .yfact = 43, .datalen = 81, .callback = atp_complete_geyser_1_2, .fuzz = 16, }; static const struct atp_info geyser1_info = { .xsensors = 16, .xsensors_17 = 26, .ysensors = 16, .xfact = 64, .yfact = 43, .datalen = 81, .callback = atp_complete_geyser_1_2, .fuzz = 16, }; static const struct atp_info geyser2_info = { .xsensors = 15, .xsensors_17 = 20, .ysensors = 9, .xfact = 64, .yfact = 43, .datalen = 64, .callback = atp_complete_geyser_1_2, .fuzz = 0, }; static const struct atp_info geyser3_info = { .xsensors = 20, .ysensors = 10, .xfact = 64, .yfact = 64, .datalen = 64, .callback = atp_complete_geyser_3_4, .fuzz = 0, }; static const struct atp_info geyser4_info = { .xsensors = 20, .ysensors = 10, .xfact = 64, .yfact = 64, .datalen = 64, .callback = atp_complete_geyser_3_4, .fuzz = 0, }; #define ATP_DEVICE(prod, info) \ { \ .match_flags = USB_DEVICE_ID_MATCH_DEVICE | \ USB_DEVICE_ID_MATCH_INT_CLASS | \ USB_DEVICE_ID_MATCH_INT_PROTOCOL, \ .idVendor = 0x05ac, /* Apple */ \ .idProduct = (prod), \ .bInterfaceClass = 0x03, \ .bInterfaceProtocol = 0x02, \ .driver_info = (unsigned long) &info, \ } /* * Table of devices (Product IDs) that work with this driver. * (The names come from Info.plist in AppleUSBTrackpad.kext, * According to Info.plist Geyser IV is the same as Geyser III.) */ static const struct usb_device_id atp_table[] = { /* PowerBooks Feb 2005, iBooks G4 */ ATP_DEVICE(0x020e, fountain_info), /* FOUNTAIN ANSI */ ATP_DEVICE(0x020f, fountain_info), /* FOUNTAIN ISO */ ATP_DEVICE(0x030a, fountain_info), /* FOUNTAIN TP ONLY */ ATP_DEVICE(0x030b, geyser1_info), /* GEYSER 1 TP ONLY */ /* PowerBooks Oct 2005 */ ATP_DEVICE(0x0214, geyser2_info), /* GEYSER 2 ANSI */ ATP_DEVICE(0x0215, geyser2_info), /* GEYSER 2 ISO */ ATP_DEVICE(0x0216, geyser2_info), /* GEYSER 2 JIS */ /* Core Duo MacBook & MacBook Pro */ ATP_DEVICE(0x0217, geyser3_info), /* GEYSER 3 ANSI */ ATP_DEVICE(0x0218, geyser3_info), /* GEYSER 3 ISO */ ATP_DEVICE(0x0219, geyser3_info), /* GEYSER 3 JIS */ /* Core2 Duo MacBook & MacBook Pro */ ATP_DEVICE(0x021a, geyser4_info), /* GEYSER 4 ANSI */ ATP_DEVICE(0x021b, geyser4_info), /* GEYSER 4 ISO */ ATP_DEVICE(0x021c, geyser4_info), /* GEYSER 4 JIS */ /* Core2 Duo MacBook3,1 */ ATP_DEVICE(0x0229, geyser4_info), /* GEYSER 4 HF ANSI */ ATP_DEVICE(0x022a, geyser4_info), /* GEYSER 4 HF ISO */ ATP_DEVICE(0x022b, geyser4_info), /* GEYSER 4 HF JIS */ /* Terminating entry */ { } }; MODULE_DEVICE_TABLE(usb, atp_table); /* maximum number of sensors */ #define ATP_XSENSORS 26 #define ATP_YSENSORS 16 /* * The largest possible bank of sensors with additional buffer of 4 extra values * on either side, for an array of smoothed sensor values. */ #define ATP_SMOOTHSIZE 34 /* maximum pressure this driver will report */ #define ATP_PRESSURE 300 /* * Threshold for the touchpad sensors. Any change less than ATP_THRESHOLD is * ignored. */ #define ATP_THRESHOLD 5 /* * How far we'll bitshift our sensor values before averaging them. Mitigates * rounding errors. */ #define ATP_SCALE 12 /* Geyser initialization constants */ #define ATP_GEYSER_MODE_READ_REQUEST_ID 1 #define ATP_GEYSER_MODE_WRITE_REQUEST_ID 9 #define ATP_GEYSER_MODE_REQUEST_VALUE 0x300 #define ATP_GEYSER_MODE_REQUEST_INDEX 0 #define ATP_GEYSER_MODE_VENDOR_VALUE 0x04 /** * enum atp_status_bits - status bit meanings * * These constants represent the meaning of the status bits. * (only Geyser 3/4) * * @ATP_STATUS_BUTTON: The button was pressed * @ATP_STATUS_BASE_UPDATE: Update of the base values (untouched pad) * @ATP_STATUS_FROM_RESET: Reset previously performed */ enum atp_status_bits { ATP_STATUS_BUTTON = BIT(0), ATP_STATUS_BASE_UPDATE = BIT(2), ATP_STATUS_FROM_RESET = BIT(4), }; /* Structure to hold all of our device specific stuff */ struct atp { char phys[64]; struct usb_device *udev; /* usb device */ struct usb_interface *intf; /* usb interface */ struct urb *urb; /* usb request block */ u8 *data; /* transferred data */ struct input_dev *input; /* input dev */ const struct atp_info *info; /* touchpad model */ bool valid; /* are the samples valid? */ bool size_detect_done; bool overflow_warned; int fingers_old; /* last reported finger count */ int x_old; /* last reported x/y, */ int y_old; /* used for smoothing */ signed char xy_cur[ATP_XSENSORS + ATP_YSENSORS]; signed char xy_old[ATP_XSENSORS + ATP_YSENSORS]; int xy_acc[ATP_XSENSORS + ATP_YSENSORS]; int smooth[ATP_SMOOTHSIZE]; int smooth_tmp[ATP_SMOOTHSIZE]; int idlecount; /* number of empty packets */ struct work_struct work; }; #define dbg_dump(msg, tab) \ if (debug > 1) { \ int __i; \ printk(KERN_DEBUG "appletouch: %s", msg); \ for (__i = 0; __i < ATP_XSENSORS + ATP_YSENSORS; __i++) \ printk(" %02x", tab[__i]); \ printk("\n"); \ } #define dprintk(format, a...) \ do { \ if (debug) \ printk(KERN_DEBUG format, ##a); \ } while (0) MODULE_AUTHOR("Johannes Berg"); MODULE_AUTHOR("Stelian Pop"); MODULE_AUTHOR("Frank Arnold"); MODULE_AUTHOR("Michael Hanselmann"); MODULE_AUTHOR("Sven Anders"); MODULE_DESCRIPTION("Apple PowerBook and MacBook USB touchpad driver"); MODULE_LICENSE("GPL"); /* * Make the threshold a module parameter */ static int threshold = ATP_THRESHOLD; module_param(threshold, int, 0644); MODULE_PARM_DESC(threshold, "Discard any change in data from a sensor" " (the trackpad has many of these sensors)" " less than this value."); static int debug; module_param(debug, int, 0644); MODULE_PARM_DESC(debug, "Activate debugging output"); /* * By default newer Geyser devices send standard USB HID mouse * packets (Report ID 2). This code changes device mode, so it * sends raw sensor reports (Report ID 5). */ static int atp_geyser_init(struct atp *dev) { struct usb_device *udev = dev->udev; char *data; int size; int i; int ret; data = kmalloc(8, GFP_KERNEL); if (!data) { dev_err(&dev->intf->dev, "Out of memory\n"); return -ENOMEM; } size = usb_control_msg(udev, usb_rcvctrlpipe(udev, 0), ATP_GEYSER_MODE_READ_REQUEST_ID, USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_INTERFACE, ATP_GEYSER_MODE_REQUEST_VALUE, ATP_GEYSER_MODE_REQUEST_INDEX, data, 8, 5000); if (size != 8) { dprintk("atp_geyser_init: read error\n"); for (i = 0; i < 8; i++) dprintk("appletouch[%d]: %d\n", i, data[i]); dev_err(&dev->intf->dev, "Failed to read mode from device.\n"); ret = -EIO; goto out_free; } /* Apply the mode switch */ data[0] = ATP_GEYSER_MODE_VENDOR_VALUE; size = usb_control_msg(udev, usb_sndctrlpipe(udev, 0), ATP_GEYSER_MODE_WRITE_REQUEST_ID, USB_DIR_OUT | USB_TYPE_CLASS | USB_RECIP_INTERFACE, ATP_GEYSER_MODE_REQUEST_VALUE, ATP_GEYSER_MODE_REQUEST_INDEX, data, 8, 5000); if (size != 8) { dprintk("atp_geyser_init: write error\n"); for (i = 0; i < 8; i++) dprintk("appletouch[%d]: %d\n", i, data[i]); dev_err(&dev->intf->dev, "Failed to request geyser raw mode\n"); ret = -EIO; goto out_free; } ret = 0; out_free: kfree(data); return ret; } /* * Reinitialise the device. This usually stops stream of empty packets * coming from it. */ static void atp_reinit(struct work_struct *work) { struct atp *dev = container_of(work, struct atp, work); int retval; dprintk("appletouch: putting appletouch to sleep (reinit)\n"); atp_geyser_init(dev); retval = usb_submit_urb(dev->urb, GFP_ATOMIC); if (retval) dev_err(&dev->intf->dev, "atp_reinit: usb_submit_urb failed with error %d\n", retval); } static int atp_calculate_abs(struct atp *dev, int offset, int nb_sensors, int fact, int *z, int *fingers) { int i, pass; /* * Use offset to point xy_sensors at the first value in dev->xy_acc * for whichever dimension we're looking at this particular go-round. */ int *xy_sensors = dev->xy_acc + offset; /* values to calculate mean */ int pcum = 0, psum = 0; int is_increasing = 0; *fingers = 0; for (i = 0; i < nb_sensors; i++) { if (xy_sensors[i] < threshold) { if (is_increasing) is_increasing = 0; /* * Makes the finger detection more versatile. For example, * two fingers with no gap will be detected. Also, my * tests show it less likely to have intermittent loss * of multiple finger readings while moving around (scrolling). * * Changes the multiple finger detection to counting humps on * sensors (transitions from nonincreasing to increasing) * instead of counting transitions from low sensors (no * finger reading) to high sensors (finger above * sensor) * * - Jason Parekh <jasonparekh@gmail.com> */ } else if (i < 1 || (!is_increasing && xy_sensors[i - 1] < xy_sensors[i])) { (*fingers)++; is_increasing = 1; } else if (i > 0 && (xy_sensors[i - 1] - xy_sensors[i] > threshold)) { is_increasing = 0; } } if (*fingers < 1) /* No need to continue if no fingers are found. */ return 0; /* * Use a smoothed version of sensor data for movement calculations, to * combat noise without needing to rely so heavily on a threshold. * This improves tracking. * * The smoothed array is bigger than the original so that the smoothing * doesn't result in edge values being truncated. */ memset(dev->smooth, 0, 4 * sizeof(dev->smooth[0])); /* Pull base values, scaled up to help avoid truncation errors. */ for (i = 0; i < nb_sensors; i++) dev->smooth[i + 4] = xy_sensors[i] << ATP_SCALE; memset(&dev->smooth[nb_sensors + 4], 0, 4 * sizeof(dev->smooth[0])); for (pass = 0; pass < 4; pass++) { /* Handle edge. */ dev->smooth_tmp[0] = (dev->smooth[0] + dev->smooth[1]) / 2; /* Average values with neighbors. */ for (i = 1; i < nb_sensors + 7; i++) dev->smooth_tmp[i] = (dev->smooth[i - 1] + dev->smooth[i] * 2 + dev->smooth[i + 1]) / 4; /* Handle other edge. */ dev->smooth_tmp[i] = (dev->smooth[i - 1] + dev->smooth[i]) / 2; memcpy(dev->smooth, dev->smooth_tmp, sizeof(dev->smooth)); } for (i = 0; i < nb_sensors + 8; i++) { /* * Skip values if they're small enough to be truncated to 0 * by scale. Mostly noise. */ if ((dev->smooth[i] >> ATP_SCALE) > 0) { pcum += dev->smooth[i] * i; psum += dev->smooth[i]; } } if (psum > 0) { *z = psum >> ATP_SCALE; /* Scale down pressure output. */ return pcum * fact / psum; } return 0; } static inline void atp_report_fingers(struct input_dev *input, int fingers) { input_report_key(input, BTN_TOOL_FINGER, fingers == 1); input_report_key(input, BTN_TOOL_DOUBLETAP, fingers == 2); input_report_key(input, BTN_TOOL_TRIPLETAP, fingers > 2); } /* Check URB status and for correct length of data package */ #define ATP_URB_STATUS_SUCCESS 0 #define ATP_URB_STATUS_ERROR 1 #define ATP_URB_STATUS_ERROR_FATAL 2 static int atp_status_check(struct urb *urb) { struct atp *dev = urb->context; struct usb_interface *intf = dev->intf; switch (urb->status) { case 0: /* success */ break; case -EOVERFLOW: if (!dev->overflow_warned) { dev_warn(&intf->dev, "appletouch: OVERFLOW with data length %d, actual length is %d\n", dev->info->datalen, dev->urb->actual_length); dev->overflow_warned = true; } fallthrough; case -ECONNRESET: case -ENOENT: case -ESHUTDOWN: /* This urb is terminated, clean up */ dev_dbg(&intf->dev, "atp_complete: urb shutting down with status: %d\n", urb->status); return ATP_URB_STATUS_ERROR_FATAL; default: dev_dbg(&intf->dev, "atp_complete: nonzero urb status received: %d\n", urb->status); return ATP_URB_STATUS_ERROR; } /* drop incomplete datasets */ if (dev->urb->actual_length != dev->info->datalen) { dprintk("appletouch: incomplete data package" " (first byte: %d, length: %d).\n", dev->data[0], dev->urb->actual_length); return ATP_URB_STATUS_ERROR; } return ATP_URB_STATUS_SUCCESS; } static void atp_detect_size(struct atp *dev) { int i; /* 17" Powerbooks have extra X sensors */ for (i = dev->info->xsensors; i < ATP_XSENSORS; i++) { if (dev->xy_cur[i]) { dev_info(&dev->intf->dev, "appletouch: 17\" model detected.\n"); input_set_abs_params(dev->input, ABS_X, 0, (dev->info->xsensors_17 - 1) *