drivers/hid/hid-magicmouse.c

   1 /*
   2  *   Apple "Magic" Wireless Mouse driver
   3  *
   4  *   Copyright (c) 2010 Michael Poole <mdpoole@troilus.org>
   5  *   Copyright (c) 2010 Chase Douglas <chase.douglas@canonical.com>
   6  */
   7
   8 /*
   9  * This program is free software; you can redistribute it and/or modify it
  10  * under the terms of the GNU General Public License as published by the Free
  11  * Software Foundation; either version 2 of the License, or (at your option)
  12  * any later version.
  13  */
  14
  15 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  16
  17 #include <linux/device.h>
  18 #include <linux/hid.h>
  19 #include <linux/input/mt.h>
  20 #include <linux/module.h>
  21 #include <linux/slab.h>
  22
  23 #include "hid-ids.h"
  24
  25 static bool emulate_3button = true;
  26 module_param(emulate_3button, bool, 0644);
  27 MODULE_PARM_DESC(emulate_3button, "Emulate a middle button");
  28
  29 static int middle_button_start = -350;
  30 static int middle_button_stop = +350;
  31
  32 static bool emulate_scroll_wheel = true;
  33 module_param(emulate_scroll_wheel, bool, 0644);
  34 MODULE_PARM_DESC(emulate_scroll_wheel, "Emulate a scroll wheel");
  35
  36 static unsigned int scroll_speed = 32;
  37 static int param_set_scroll_speed(const char *val,
  38                                   const struct kernel_param *kp) {
  39         unsigned long speed;
  40         if (!val || kstrtoul(val, 0, &speed) || speed > 63)
  41                 return -EINVAL;
  42         scroll_speed = speed;
  43         return 0;
  44 }
  45 module_param_call(scroll_speed, param_set_scroll_speed, param_get_uint, &scroll_speed, 0644);
  46 MODULE_PARM_DESC(scroll_speed, "Scroll speed, value from 0 (slow) to 63 (fast)");
  47
  48 static bool scroll_acceleration = false;
  49 module_param(scroll_acceleration, bool, 0644);
  50 MODULE_PARM_DESC(scroll_acceleration, "Accelerate sequential scroll events");
  51
  52 static bool report_undeciphered;
  53 module_param(report_undeciphered, bool, 0644);
  54 MODULE_PARM_DESC(report_undeciphered, "Report undeciphered multi-touch state field using a MSC_RAW event");
  55
  56 #define TRACKPAD_REPORT_ID 0x28
  57 #define MOUSE_REPORT_ID    0x29
  58 #define DOUBLE_REPORT_ID   0xf7
  59 /* These definitions are not precise, but they're close enough.  (Bits
  60  * 0x03 seem to indicate the aspect ratio of the touch, bits 0x70 seem
  61  * to be some kind of bit mask -- 0x20 may be a near-field reading,
  62  * and 0x40 is actual contact, and 0x10 may be a start/stop or change
  63  * indication.)
  64  */
  65 #define TOUCH_STATE_MASK  0xf0
  66 #define TOUCH_STATE_NONE  0x00
  67 #define TOUCH_STATE_START 0x30
  68 #define TOUCH_STATE_DRAG  0x40
  69
  70 #define SCROLL_ACCEL_DEFAULT 7
  71
  72 /* Touch surface information. Dimension is in hundredths of a mm, min and max
  73  * are in units. */
  74 #define MOUSE_DIMENSION_X (float)9056
  75 #define MOUSE_MIN_X -1100
  76 #define MOUSE_MAX_X 1258
  77 #define MOUSE_RES_X ((MOUSE_MAX_X - MOUSE_MIN_X) / (MOUSE_DIMENSION_X / 100))
  78 #define MOUSE_DIMENSION_Y (float)5152
  79 #define MOUSE_MIN_Y -1589
  80 #define MOUSE_MAX_Y 2047
  81 #define MOUSE_RES_Y ((MOUSE_MAX_Y - MOUSE_MIN_Y) / (MOUSE_DIMENSION_Y / 100))
  82
  83 #define TRACKPAD_DIMENSION_X (float)13000
  84 #define TRACKPAD_MIN_X -2909
  85 #define TRACKPAD_MAX_X 3167
  86 #define TRACKPAD_RES_X \
  87         ((TRACKPAD_MAX_X - TRACKPAD_MIN_X) / (TRACKPAD_DIMENSION_X / 100))
  88 #define TRACKPAD_DIMENSION_Y (float)11000
  89 #define TRACKPAD_MIN_Y -2456
  90 #define TRACKPAD_MAX_Y 2565
  91 #define TRACKPAD_RES_Y \
  92         ((TRACKPAD_MAX_Y - TRACKPAD_MIN_Y) / (TRACKPAD_DIMENSION_Y / 100))
  93
  94 /**
  95  * struct magicmouse_sc - Tracks Magic Mouse-specific data.
  96  * @input: Input device through which we report events.
  97  * @quirks: Currently unused.
  98  * @ntouches: Number of touches in most recent touch report.
  99  * @scroll_accel: Number of consecutive scroll motions.
 100  * @scroll_jiffies: Time of last scroll motion.
 101  * @touches: Most recent data for a touch, indexed by tracking ID.
 102  * @tracking_ids: Mapping of current touch input data to @touches.
 103  */
 104 struct magicmouse_sc {
 105         struct input_dev *input;
 106         unsigned long quirks;
 107
 108         int ntouches;
 109         int scroll_accel;
 110         unsigned long scroll_jiffies;
 111
 112         struct {
 113                 short x;
 114                 short y;
 115                 short scroll_x;
 116                 short scroll_y;
 117                 u8 size;
 118         } touches[16];
 119         int tracking_ids[16];
 120 };
 121
 122 static int magicmouse_firm_touch(struct magicmouse_sc *msc)
 123 {
 124         int touch = -1;
 125         int ii;
 126
 127         /* If there is only one "firm" touch, set touch to its
 128          * tracking ID.
 129          */
 130         for (ii = 0; ii < msc->ntouches; ii++) {
 131                 int idx = msc->tracking_ids[ii];
 132                 if (msc->touches[idx].size < 8) {
 133                         /* Ignore this touch. */
 134                 } else if (touch >= 0) {
 135                         touch = -1;
 136                         break;
 137                 } else {
 138                         touch = idx;
 139                 }
 140         }
 141
 142         return touch;
 143 }
 144
 145 static void magicmouse_emit_buttons(struct magicmouse_sc *msc, int state)
 146 {
 147         int last_state = test_bit(BTN_LEFT, msc->input->key) << 0 |
 148                 test_bit(BTN_RIGHT, msc->input->key) << 1 |
 149                 test_bit(BTN_MIDDLE, msc->input->key) << 2;
 150
 151         if (emulate_3button) {
 152                 int id;
 153
 154                 /* If some button was pressed before, keep it held
 155                  * down.  Otherwise, if there's exactly one firm
 156                  * touch, use that to override the mouse's guess.
 157                  */
 158                 if (state == 0) {
 159                         /* The button was released. */
 160                 } else if (last_state != 0) {
 161                         state = last_state;
 162                 } else if ((id = magicmouse_firm_touch(msc)) >= 0) {
 163                         int x = msc->touches[id].x;
 164                         if (x < middle_button_start)
 165                                 state = 1;
 166                         else if (x > middle_button_stop)
 167                                 state = 2;
 168                         else
 169                                 state = 4;
 170                 } /* else: we keep the mouse's guess */
 171
 172                 input_report_key(msc->input, BTN_MIDDLE, state & 4);
 173         }
 174
 175         input_report_key(msc->input, BTN_LEFT, state & 1);
 176         input_report_key(msc->input, BTN_RIGHT, state & 2);
 177
 178         if (state != last_state)
 179                 msc->scroll_accel = SCROLL_ACCEL_DEFAULT;
 180 }
 181
 182 static void magicmouse_emit_touch(struct magicmouse_sc *msc, int raw_id, u8 *tdata)
 183 {
 184         struct input_dev *input = msc->input;
 185         int id, x, y, size, orientation, touch_major, touch_minor, state, down;
 186
 187         if (input->id.product == USB_DEVICE_ID_APPLE_MAGICMOUSE) {
 188                 id = (tdata[6] << 2 | tdata[5] >> 6) & 0xf;
 189                 x = (tdata[1] << 28 | tdata[0] << 20) >> 20;
 190                 y = -((tdata[2] << 24 | tdata[1] << 16) >> 20);
 191                 size = tdata[5] & 0x3f;
 192                 orientation = (tdata[6] >> 2) - 32;
 193                 touch_major = tdata[3];
 194                 touch_minor = tdata[4];
 195                 state = tdata[7] & TOUCH_STATE_MASK;
 196                 down = state != TOUCH_STATE_NONE;
 197         } else { /* USB_DEVICE_ID_APPLE_MAGICTRACKPAD */
 198                 id = (tdata[7] << 2 | tdata[6] >> 6) & 0xf;
 199                 x = (tdata[1] << 27 | tdata[0] << 19) >> 19;
 200                 y = -((tdata[3] << 30 | tdata[2] << 22 | tdata[1] << 14) >> 19);
 201                 size = tdata[6] & 0x3f;
 202                 orientation = (tdata[7] >> 2) - 32;
 203                 touch_major = tdata[4];
 204                 touch_minor = tdata[5];
 205                 state = tdata[8] & TOUCH_STATE_MASK;
 206                 down = state != TOUCH_STATE_NONE;
 207         }
 208
 209         /* Store tracking ID and other fields. */
 210         msc->tracking_ids[raw_id] = id;
 211         msc->touches[id].x = x;
 212         msc->touches[id].y = y;
 213         msc->touches[id].size = size;
 214
 215         /* If requested, emulate a scroll wheel by detecting small
 216          * vertical touch motions.
 217          */
 218         if (emulate_scroll_wheel) {
 219                 unsigned long now = jiffies;
 220                 int step_x = msc->touches[id].scroll_x - x;
 221                 int step_y = msc->touches[id].scroll_y - y;
 222
 223                 /* Calculate and apply the scroll motion. */
 224                 switch (state) {
 225                 case TOUCH_STATE_START:
 226                         msc->touches[id].scroll_x = x;
 227                         msc->touches[id].scroll_y = y;
 228
 229                         /* Reset acceleration after half a second. */
 230                         if (scroll_acceleration && time_before(now,
 231                                                 msc->scroll_jiffies + HZ / 2))
 232                                 msc->scroll_accel = max_t(int,
 233                                                 msc->scroll_accel - 1, 1);
 234                         else
 235                                 msc->scroll_accel = SCROLL_ACCEL_DEFAULT;
 236
 237                         break;
 238                 case TOUCH_STATE_DRAG:
 239                         step_x /= (64 - (int)scroll_speed) * msc->scroll_accel;
 240                         if (step_x != 0) {
 241                                 msc->touches[id].scroll_x -= step_x *
 242                                         (64 - scroll_speed) * msc->scroll_accel;
 243                                 msc->scroll_jiffies = now;
 244                                 input_report_rel(input, REL_HWHEEL, -step_x);
 245                         }
 246
 247                         step_y /= (64 - (int)scroll_speed) * msc->scroll_accel;
 248                         if (step_y != 0) {
 249                                 msc->touches[id].scroll_y -= step_y *
 250                                         (64 - scroll_speed) * msc->scroll_accel;
 251                                 msc->scroll_jiffies = now;
 252                                 input_report_rel(input, REL_WHEEL, step_y);
 253                         }
 254                         break;
 255                 }
 256         }
 257
 258         if (down)
 259                 msc->ntouches++;
 260
 261         input_mt_slot(input, id);
 262         input_mt_report_slot_state(input, MT_TOOL_FINGER, down);
 263
 264         /* Generate the input events for this touch. */
 265         if (down) {
 266                 input_report_abs(input, ABS_MT_TOUCH_MAJOR, touch_major << 2);
 267                 input_report_abs(input, ABS_MT_TOUCH_MINOR, touch_minor << 2);
 268                 input_report_abs(input, ABS_MT_ORIENTATION, -orientation);
 269                 input_report_abs(input, ABS_MT_POSITION_X, x);
 270                 input_report_abs(input, ABS_MT_POSITION_Y, y);
 271
 272                 if (report_undeciphered) {
 273                         if (input->id.product == USB_DEVICE_ID_APPLE_MAGICMOUSE)
 274                                 input_event(input, EV_MSC, MSC_RAW, tdata[7]);
 275                         else /* USB_DEVICE_ID_APPLE_MAGICTRACKPAD */
 276                                 input_event(input, EV_MSC, MSC_RAW, tdata[8]);
 277                 }
 278         }
 279 }
 280
 281 static int magicmouse_raw_event(struct hid_device *hdev,
 282                 struct hid_report *report, u8 *data, int size)
 283 {
 284         struct magicmouse_sc *msc = hid_get_drvdata(hdev);
 285         struct input_dev *input = msc->input;
 286         int x = 0, y = 0, ii, clicks = 0, npoints;
 287
 288         switch (data[0]) {
 289         case TRACKPAD_REPORT_ID:
 290                 /* Expect four bytes of prefix, and N*9 bytes of touch data. */
 291                 if (size < 4 || ((size - 4) % 9) != 0)
 292                         return 0;
 293                 npoints = (size - 4) / 9;
 294                 if (npoints > 15) {
 295                         hid_warn(hdev, "invalid size value (%d) for TRACKPAD_REPORT_ID\n",
 296                                         size);
 297                         return 0;
 298                 }
 299                 msc->ntouches = 0;
 300                 for (ii = 0; ii < npoints; ii++)
 301                         magicmouse_emit_touch(msc, ii, data + ii * 9 + 4);
 302
 303                 clicks = data[1];
 304
 305                 /* The following bits provide a device specific timestamp. They
 306                  * are unused here.
 307                  *
 308                  * ts = data[1] >> 6 | data[2] << 2 | data[3] << 10;
 309                  */
 310                 break;
 311         case MOUSE_REPORT_ID:
 312                 /* Expect six bytes of prefix, and N*8 bytes of touch data. */
 313                 if (size < 6 || ((size - 6) % 8) != 0)
 314                         return 0;
 315                 npoints = (size - 6) / 8;
 316                 if (npoints > 15) {
 317                         hid_warn(hdev, "invalid size value (%d) for MOUSE_REPORT_ID\n",
 318                                         size);
 319                         return 0;
 320                 }
 321                 msc->ntouches = 0;
 322                 for (ii = 0; ii < npoints; ii++)
 323                         magicmouse_emit_touch(msc, ii, data + ii * 8 + 6);
 324
 325                 /* When emulating three-button mode, it is important
 326                  * to have the current touch information before
 327                  * generating a click event.
 328                  */
 329                 x = (int)(((data[3] & 0x0c) << 28) | (data[1] << 22)) >> 22;
 330                 y = (int)(((data[3] & 0x30) << 26) | (data[2] << 22)) >> 22;
 331                 clicks = data[3];
 332
 333                 /* The following bits provide a device specific timestamp. They
 334                  * are unused here.
 335                  *
 336                  * ts = data[3] >> 6 | data[4] << 2 | data[5] << 10;
 337                  */
 338                 break;
 339         case DOUBLE_REPORT_ID:
 340                 /* Sometimes the trackpad sends two touch reports in one
 341                  * packet.
 342                  */
 343                 magicmouse_raw_event(hdev, report, data + 2, data[1]);
 344                 magicmouse_raw_event(hdev, report, data + 2 + data[1],
 345                         size - 2 - data[1]);
 346                 break;
 347         default:
 348                 return 0;
 349         }
 350
 351         if (input->id.product == USB_DEVICE_ID_APPLE_MAGICMOUSE) {
 352                 magicmouse_emit_buttons(msc, clicks & 3);
 353                 input_report_rel(input, REL_X, x);
 354                 input_report_rel(input, REL_Y, y);
 355         } else { /* USB_DEVICE_ID_APPLE_MAGICTRACKPAD */
 356                 input_report_key(input, BTN_MOUSE, clicks & 1);
 357                 input_mt_report_pointer_emulation(input, true);
 358         }
 359
 360         input_sync(input);
 361         return 1;
 362 }
 363
 364 static int magicmouse_setup_input(struct input_dev *input, struct hid_device *hdev)
 365 {
 366         int error;
 367
 368         __set_bit(EV_KEY, input->evbit);
 369
 370         if (input->id.product == USB_DEVICE_ID_APPLE_MAGICMOUSE) {
 371                 __set_bit(BTN_LEFT, input->keybit);
 372                 __set_bit(BTN_RIGHT, input->keybit);
 373                 if (emulate_3button)
 374                         __set_bit(BTN_MIDDLE, input->keybit);
 375
 376                 __set_bit(EV_REL, input->evbit);
 377                 __set_bit(REL_X, input->relbit);
 378                 __set_bit(REL_Y, input->relbit);
 379                 if (emulate_scroll_wheel) {
 380                         __set_bit(REL_WHEEL, input->relbit);
 381                         __set_bit(REL_HWHEEL, input->relbit);
 382                 }
 383         } else { /* USB_DEVICE_ID_APPLE_MAGICTRACKPAD */
 384                 /* input->keybit is initialized with incorrect button info
 385                  * for Magic Trackpad. There really is only one physical
 386                  * button (BTN_LEFT == BTN_MOUSE). Make sure we don't
 387                  * advertise buttons that don't exist...
 388                  */
 389                 __clear_bit(BTN_RIGHT, input->keybit);
 390                 __clear_bit(BTN_MIDDLE, input->keybit);
 391                 __set_bit(BTN_MOUSE, input->keybit);
 392                 __set_bit(BTN_TOOL_FINGER, input->keybit);
 393                 __set_bit(BTN_TOOL_DOUBLETAP, input->keybit);
 394                 __set_bit(BTN_TOOL_TRIPLETAP, input->keybit);
 395                 __set_bit(BTN_TOOL_QUADTAP, input->keybit);
 396                 __set_bit(BTN_TOOL_QUINTTAP, input->keybit);
 397                 __set_bit(BTN_TOUCH, input->keybit);
 398                 __set_bit(INPUT_PROP_POINTER, input->propbit);
 399                 __set_bit(INPUT_PROP_BUTTONPAD, input->propbit);
 400         }
 401
 402
 403         __set_bit(EV_ABS, input->evbit);
 404
 405         error = input_mt_init_slots(input, 16, 0);
 406         if (error)
 407                 return error;
 408         input_set_abs_params(input, ABS_MT_TOUCH_MAJOR, 0, 255 << 2,
 409                              4, 0);
 410         input_set_abs_params(input, ABS_MT_TOUCH_MINOR, 0, 255 << 2,
 411                              4, 0);
 412         input_set_abs_params(input, ABS_MT_ORIENTATION, -31, 32, 1, 0);
 413
 414         /* Note: Touch Y position from the device is inverted relative
 415          * to how pointer motion is reported (and relative to how USB
 416          * HID recommends the coordinates work).  This driver keeps
 417          * the origin at the same position, and just uses the additive
 418          * inverse of the reported Y.
 419          */
 420         if (input->id.product == USB_DEVICE_ID_APPLE_MAGICMOUSE) {
 421                 input_set_abs_params(input, ABS_MT_POSITION_X,
 422                                      MOUSE_MIN_X, MOUSE_MAX_X, 4, 0);
 423                 input_set_abs_params(input, ABS_MT_POSITION_Y,
 424                                      MOUSE_MIN_Y, MOUSE_MAX_Y, 4, 0);
 425
 426                 input_abs_set_res(input, ABS_MT_POSITION_X,
 427                                   MOUSE_RES_X);
 428                 input_abs_set_res(input, ABS_MT_POSITION_Y,
 429                                   MOUSE_RES_Y);
 430         } else { /* USB_DEVICE_ID_APPLE_MAGICTRACKPAD */
 431                 input_set_abs_params(input, ABS_X, TRACKPAD_MIN_X,
 432                                      TRACKPAD_MAX_X, 4, 0);
 433                 input_set_abs_params(input, ABS_Y, TRACKPAD_MIN_Y,
 434                                      TRACKPAD_MAX_Y, 4, 0);
 435                 input_set_abs_params(input, ABS_MT_POSITION_X,
 436                                      TRACKPAD_MIN_X, TRACKPAD_MAX_X, 4, 0);
 437                 input_set_abs_params(input, ABS_MT_POSITION_Y,
 438                                      TRACKPAD_MIN_Y, TRACKPAD_MAX_Y, 4, 0);
 439
 440                 input_abs_set_res(input, ABS_X, TRACKPAD_RES_X);
 441                 input_abs_set_res(input, ABS_Y, TRACKPAD_RES_Y);
 442                 input_abs_set_res(input, ABS_MT_POSITION_X,
 443                                   TRACKPAD_RES_X);
 444                 input_abs_set_res(input, ABS_MT_POSITION_Y,
 445                                   TRACKPAD_RES_Y);
 446         }
 447
 448         input_set_events_per_packet(input, 60);
 449
 450         if (report_undeciphered) {
 451                 __set_bit(EV_MSC, input->evbit);
 452                 __set_bit(MSC_RAW, input->mscbit);
 453         }
 454
 455         return 0;
 456 }
 457
 458 static int magicmouse_input_mapping(struct hid_device *hdev,
 459                 struct hid_input *hi, struct hid_field *field,
 460                 struct hid_usage *usage, unsigned long **bit, int *max)
 461 {
 462         struct magicmouse_sc *msc = hid_get_drvdata(hdev);
 463
 464         if (!msc->input)
 465                 msc->input = hi->input;
 466
 467         /* Magic Trackpad does not give relative data after switching to MT */
 468         if (hi->input->id.product == USB_DEVICE_ID_APPLE_MAGICTRACKPAD &&
 469             field->flags & HID_MAIN_ITEM_RELATIVE)
 470                 return -1;
 471
 472         return 0;
 473 }
 474
 475 static int magicmouse_input_configured(struct hid_device *hdev,
 476                 struct hid_input *hi)
 477
 478 {
 479         struct magicmouse_sc *msc = hid_get_drvdata(hdev);
 480         int ret;
 481
 482         ret = magicmouse_setup_input(msc->input, hdev);
 483         if (ret) {
 484                 hid_err(hdev, "magicmouse setup input failed (%d)\n", ret);
 485                 /* clean msc->input to notify probe() of the failure */
 486                 msc->input = NULL;
 487                 return ret;
 488         }
 489
 490         return 0;
 491 }
 492
 493
 494 static int magicmouse_probe(struct hid_device *hdev,
 495         const struct hid_device_id *id)
 496 {
 497         const u8 feature[] = { 0xd7, 0x01 };
 498         u8 *buf;
 499         struct magicmouse_sc *msc;
 500         struct hid_report *report;
 501         int ret;
 502
 503         msc = devm_kzalloc(&hdev->dev, sizeof(*msc), GFP_KERNEL);
 504         if (msc == NULL) {
 505                 hid_err(hdev, "can't alloc magicmouse descriptor\n");
 506                 return -ENOMEM;
 507         }
 508
 509         msc->scroll_accel = SCROLL_ACCEL_DEFAULT;
 510
 511         msc->quirks = id->driver_data;
 512         hid_set_drvdata(hdev, msc);
 513
 514         ret = hid_parse(hdev);
 515         if (ret) {
 516                 hid_err(hdev, "magicmouse hid parse failed\n");
 517                 return ret;
 518         }
 519
 520         ret = hid_hw_start(hdev, HID_CONNECT_DEFAULT);
 521         if (ret) {
 522                 hid_err(hdev, "magicmouse hw start failed\n");
 523                 return ret;
 524         }
 525
 526         if (!msc->input) {
 527                 hid_err(hdev, "magicmouse input not registered\n");
 528                 ret = -ENOMEM;
 529                 goto err_stop_hw;
 530         }
 531
 532         if (id->product == USB_DEVICE_ID_APPLE_MAGICMOUSE)
 533                 report = hid_register_report(hdev, HID_INPUT_REPORT,
 534                         MOUSE_REPORT_ID, 0);
 535         else { /* USB_DEVICE_ID_APPLE_MAGICTRACKPAD */
 536                 report = hid_register_report(hdev, HID_INPUT_REPORT,
 537                         TRACKPAD_REPORT_ID, 0);
 538                 report = hid_register_report(hdev, HID_INPUT_REPORT,
 539                         DOUBLE_REPORT_ID, 0);
 540         }
 541
 542         if (!report) {
 543                 hid_err(hdev, "unable to register touch report\n");
 544                 ret = -ENOMEM;
 545                 goto err_stop_hw;
 546         }
 547         report->size = 6;
 548
 549         buf = kmemdup(feature, sizeof(feature), GFP_KERNEL);
 550         if (!buf) {
 551                 ret = -ENOMEM;
 552                 goto err_stop_hw;
 553         }
 554
 555         /*
 556          * Some devices repond with 'invalid report id' when feature
 557          * report switching it into multitouch mode is sent to it.
 558          *
 559          * This results in -EIO from the _raw low-level transport callback,
 560          * but there seems to be no other way of switching the mode.
 561          * Thus the super-ugly hacky success check below.
 562          */
 563         ret = hid_hw_raw_request(hdev, buf[0], buf, sizeof(feature),
 564                                 HID_FEATURE_REPORT, HID_REQ_SET_REPORT);
 565         kfree(buf);
 566         if (ret != -EIO && ret != sizeof(feature)) {
 567                 hid_err(hdev, "unable to request touch data (%d)\n", ret);
 568                 goto err_stop_hw;
 569         }
 570
 571         return 0;
 572 err_stop_hw:
 573         hid_hw_stop(hdev);
 574         return ret;
 575 }
 576
 577 static const struct hid_device_id magic_mice[] = {
 578         { HID_BLUETOOTH_DEVICE(USB_VENDOR_ID_APPLE,
 579                 USB_DEVICE_ID_APPLE_MAGICMOUSE), .driver_data = 0 },
 580         { HID_BLUETOOTH_DEVICE(USB_VENDOR_ID_APPLE,
 581                 USB_DEVICE_ID_APPLE_MAGICTRACKPAD), .driver_data = 0 },
 582         { }
 583 };
 584 MODULE_DEVICE_TABLE(hid, magic_mice);
 585
 586 static struct hid_driver magicmouse_driver = {
 587         .name = "magicmouse",
 588         .id_table = magic_mice,
 589         .probe = magicmouse_probe,
 590         .raw_event = magicmouse_raw_event,
 591         .input_mapping = magicmouse_input_mapping,
 592         .input_configured = magicmouse_input_configured,
 593 };
 594 module_hid_driver(magicmouse_driver);
 595
 596 MODULE_LICENSE("GPL");