drivers/hid/hid-magicmouse.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  *   Apple "Magic" Wireless Mouse driver
   4  *
   5  *   Copyright (c) 2010 Michael Poole <[email protected]>
   6  *   Copyright (c) 2010 Chase Douglas <[email protected]>
   7  */
   8
   9 /*
  10  */
  11
  12 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  13
  14 #include <linux/device.h>
  15 #include <linux/hid.h>
  16 #include <linux/input/mt.h>
  17 #include <linux/module.h>
  18 #include <linux/slab.h>
  19 #include <linux/workqueue.h>
  20
  21 #include "hid-ids.h"
  22
  23 static bool emulate_3button = true;
  24 module_param(emulate_3button, bool, 0644);
  25 MODULE_PARM_DESC(emulate_3button, "Emulate a middle button");
  26
  27 static int middle_button_start = -350;
  28 static int middle_button_stop = +350;
  29
  30 static bool emulate_scroll_wheel = true;
  31 module_param(emulate_scroll_wheel, bool, 0644);
  32 MODULE_PARM_DESC(emulate_scroll_wheel, "Emulate a scroll wheel");
  33
  34 static unsigned int scroll_speed = 32;
  35 static int param_set_scroll_speed(const char *val,
  36                                   const struct kernel_param *kp) {
  37         unsigned long speed;
  38         if (!val || kstrtoul(val, 0, &speed) || speed > 63)
  39                 return -EINVAL;
  40         scroll_speed = speed;
  41         return 0;
  42 }
  43 module_param_call(scroll_speed, param_set_scroll_speed, param_get_uint, &scroll_speed, 0644);
  44 MODULE_PARM_DESC(scroll_speed, "Scroll speed, value from 0 (slow) to 63 (fast)");
  45
  46 static bool scroll_acceleration = false;
  47 module_param(scroll_acceleration, bool, 0644);
  48 MODULE_PARM_DESC(scroll_acceleration, "Accelerate sequential scroll events");
  49
  50 static bool report_undeciphered;
  51 module_param(report_undeciphered, bool, 0644);
  52 MODULE_PARM_DESC(report_undeciphered, "Report undeciphered multi-touch state field using a MSC_RAW event");
  53
  54 #define TRACKPAD_REPORT_ID 0x28
  55 #define TRACKPAD2_USB_REPORT_ID 0x02
  56 #define TRACKPAD2_BT_REPORT_ID 0x31
  57 #define MOUSE_REPORT_ID    0x29
  58 #define MOUSE2_REPORT_ID   0x12
  59 #define DOUBLE_REPORT_ID   0xf7
  60 /* These definitions are not precise, but they're close enough.  (Bits
  61  * 0x03 seem to indicate the aspect ratio of the touch, bits 0x70 seem
  62  * to be some kind of bit mask -- 0x20 may be a near-field reading,
  63  * and 0x40 is actual contact, and 0x10 may be a start/stop or change
  64  * indication.)
  65  */
  66 #define TOUCH_STATE_MASK  0xf0
  67 #define TOUCH_STATE_NONE  0x00
  68 #define TOUCH_STATE_START 0x30
  69 #define TOUCH_STATE_DRAG  0x40
  70
  71 /* Number of high-resolution events for each low-resolution detent. */
  72 #define SCROLL_HR_STEPS 10
  73 #define SCROLL_HR_MULT (120 / SCROLL_HR_STEPS)
  74 #define SCROLL_HR_THRESHOLD 90 /* units */
  75 #define SCROLL_ACCEL_DEFAULT 7
  76
  77 /* Touch surface information. Dimension is in hundredths of a mm, min and max
  78  * are in units. */
  79 #define MOUSE_DIMENSION_X (float)9056
  80 #define MOUSE_MIN_X -1100
  81 #define MOUSE_MAX_X 1258
  82 #define MOUSE_RES_X ((MOUSE_MAX_X - MOUSE_MIN_X) / (MOUSE_DIMENSION_X / 100))
  83 #define MOUSE_DIMENSION_Y (float)5152
  84 #define MOUSE_MIN_Y -1589
  85 #define MOUSE_MAX_Y 2047
  86 #define MOUSE_RES_Y ((MOUSE_MAX_Y - MOUSE_MIN_Y) / (MOUSE_DIMENSION_Y / 100))
  87
  88 #define TRACKPAD_DIMENSION_X (float)13000
  89 #define TRACKPAD_MIN_X -2909
  90 #define TRACKPAD_MAX_X 3167
  91 #define TRACKPAD_RES_X \
  92         ((TRACKPAD_MAX_X - TRACKPAD_MIN_X) / (TRACKPAD_DIMENSION_X / 100))
  93 #define TRACKPAD_DIMENSION_Y (float)11000
  94 #define TRACKPAD_MIN_Y -2456
  95 #define TRACKPAD_MAX_Y 2565
  96 #define TRACKPAD_RES_Y \
  97         ((TRACKPAD_MAX_Y - TRACKPAD_MIN_Y) / (TRACKPAD_DIMENSION_Y / 100))
  98
  99 #define TRACKPAD2_DIMENSION_X (float)16000
 100 #define TRACKPAD2_MIN_X -3678
 101 #define TRACKPAD2_MAX_X 3934
 102 #define TRACKPAD2_RES_X \
 103         ((TRACKPAD2_MAX_X - TRACKPAD2_MIN_X) / (TRACKPAD2_DIMENSION_X / 100))
 104 #define TRACKPAD2_DIMENSION_Y (float)11490
 105 #define TRACKPAD2_MIN_Y -2478
 106 #define TRACKPAD2_MAX_Y 2587
 107 #define TRACKPAD2_RES_Y \
 108         ((TRACKPAD2_MAX_Y - TRACKPAD2_MIN_Y) / (TRACKPAD2_DIMENSION_Y / 100))
 109
 110 /**
 111  * struct magicmouse_sc - Tracks Magic Mouse-specific data.
 112  * @input: Input device through which we report events.
 113  * @quirks: Currently unused.
 114  * @ntouches: Number of touches in most recent touch report.
 115  * @scroll_accel: Number of consecutive scroll motions.
 116  * @scroll_jiffies: Time of last scroll motion.
 117  * @touches: Most recent data for a touch, indexed by tracking ID.
 118  * @tracking_ids: Mapping of current touch input data to @touches.
 119  */
 120 struct magicmouse_sc {
 121         struct input_dev *input;
 122         unsigned long quirks;
 123
 124         int ntouches;
 125         int scroll_accel;
 126         unsigned long scroll_jiffies;
 127
 128         struct {
 129                 short x;
 130                 short y;
 131                 short scroll_x;
 132                 short scroll_y;
 133                 short scroll_x_hr;
 134                 short scroll_y_hr;
 135                 u8 size;
 136                 bool scroll_x_active;
 137                 bool scroll_y_active;
 138         } touches[16];
 139         int tracking_ids[16];
 140
 141         struct hid_device *hdev;
 142         struct delayed_work work;
 143 };
 144
 145 static int magicmouse_firm_touch(struct magicmouse_sc *msc)
 146 {
 147         int touch = -1;
 148         int ii;
 149
 150         /* If there is only one "firm" touch, set touch to its
 151          * tracking ID.
 152          */
 153         for (ii = 0; ii < msc->ntouches; ii++) {
 154                 int idx = msc->tracking_ids[ii];
 155                 if (msc->touches[idx].size < 8) {
 156                         /* Ignore this touch. */
 157                 } else if (touch >= 0) {
 158                         touch = -1;
 159                         break;
 160                 } else {
 161                         touch = idx;
 162                 }
 163         }
 164
 165         return touch;
 166 }
 167
 168 static void magicmouse_emit_buttons(struct magicmouse_sc *msc, int state)
 169 {
 170         int last_state = test_bit(BTN_LEFT, msc->input->key) << 0 |
 171                 test_bit(BTN_RIGHT, msc->input->key) << 1 |
 172                 test_bit(BTN_MIDDLE, msc->input->key) << 2;
 173
 174         if (emulate_3button) {
 175                 int id;
 176
 177                 /* If some button was pressed before, keep it held
 178                  * down.  Otherwise, if there's exactly one firm
 179                  * touch, use that to override the mouse's guess.
 180                  */
 181                 if (state == 0) {
 182                         /* The button was released. */
 183                 } else if (last_state != 0) {
 184                         state = last_state;
 185                 } else if ((id = magicmouse_firm_touch(msc)) >= 0) {
 186                         int x = msc->touches[id].x;
 187                         if (x < middle_button_start)
 188                                 state = 1;
 189                         else if (x > middle_button_stop)
 190                                 state = 2;
 191                         else
 192                                 state = 4;
 193                 } /* else: we keep the mouse's guess */
 194
 195                 input_report_key(msc->input, BTN_MIDDLE, state & 4);
 196         }
 197
 198         input_report_key(msc->input, BTN_LEFT, state & 1);
 199         input_report_key(msc->input, BTN_RIGHT, state & 2);
 200
 201         if (state != last_state)
 202                 msc->scroll_accel = SCROLL_ACCEL_DEFAULT;
 203 }
 204
 205 static void magicmouse_emit_touch(struct magicmouse_sc *msc, int raw_id, u8 *tdata)
 206 {
 207         struct input_dev *input = msc->input;
 208         int id, x, y, size, orientation, touch_major, touch_minor, state, down;
 209         int pressure = 0;
 210
 211         if (input->id.product == USB_DEVICE_ID_APPLE_MAGICMOUSE ||
 212             input->id.product == USB_DEVICE_ID_APPLE_MAGICMOUSE2) {
 213                 id = (tdata[6] << 2 | tdata[5] >> 6) & 0xf;
 214                 x = (tdata[1] << 28 | tdata[0] << 20) >> 20;
 215                 y = -((tdata[2] << 24 | tdata[1] << 16) >> 20);
 216                 size = tdata[5] & 0x3f;
 217                 orientation = (tdata[6] >> 2) - 32;
 218                 touch_major = tdata[3];
 219                 touch_minor = tdata[4];
 220                 state = tdata[7] & TOUCH_STATE_MASK;
 221                 down = state != TOUCH_STATE_NONE;
 222         } else if (input->id.product == USB_DEVICE_ID_APPLE_MAGICTRACKPAD2) {
 223                 id = tdata[8] & 0xf;
 224                 x = (tdata[1] << 27 | tdata[0] << 19) >> 19;
 225                 y = -((tdata[3] << 30 | tdata[2] << 22 | tdata[1] << 14) >> 19);
 226                 size = tdata[6];
 227                 orientation = (tdata[8] >> 5) - 4;
 228                 touch_major = tdata[4];
 229                 touch_minor = tdata[5];
 230                 pressure = tdata[7];
 231                 state = tdata[3] & 0xC0;
 232                 down = state == 0x80;
 233         } else { /* USB_DEVICE_ID_APPLE_MAGICTRACKPAD */
 234                 id = (tdata[7] << 2 | tdata[6] >> 6) & 0xf;
 235                 x = (tdata[1] << 27 | tdata[0] << 19) >> 19;
 236                 y = -((tdata[3] << 30 | tdata[2] << 22 | tdata[1] << 14) >> 19);
 237                 size = tdata[6] & 0x3f;
 238                 orientation = (tdata[7] >> 2) - 32;
 239                 touch_major = tdata[4];
 240                 touch_minor = tdata[5];
 241                 state = tdata[8] & TOUCH_STATE_MASK;
 242                 down = state != TOUCH_STATE_NONE;
 243         }
 244
 245         /* Store tracking ID and other fields. */
 246         msc->tracking_ids[raw_id] = id;
 247         msc->touches[id].x = x;
 248         msc->touches[id].y = y;
 249         msc->touches[id].size = size;
 250
 251         /* If requested, emulate a scroll wheel by detecting small
 252          * vertical touch motions.
 253          */
 254         if (emulate_scroll_wheel && (input->id.product !=
 255                         USB_DEVICE_ID_APPLE_MAGICTRACKPAD2)) {
 256                 unsigned long now = jiffies;
 257                 int step_x = msc->touches[id].scroll_x - x;
 258                 int step_y = msc->touches[id].scroll_y - y;
 259                 int step_hr =
 260                         max_t(int,
 261                               ((64 - (int)scroll_speed) * msc->scroll_accel) /
 262                                         SCROLL_HR_STEPS,
 263                               1);
 264                 int step_x_hr = msc->touches[id].scroll_x_hr - x;
 265                 int step_y_hr = msc->touches[id].scroll_y_hr - y;
 266
 267                 /* Calculate and apply the scroll motion. */
 268                 switch (state) {
 269                 case TOUCH_STATE_START:
 270                         msc->touches[id].scroll_x = x;
 271                         msc->touches[id].scroll_y = y;
 272                         msc->touches[id].scroll_x_hr = x;
 273                         msc->touches[id].scroll_y_hr = y;
 274                         msc->touches[id].scroll_x_active = false;
 275                         msc->touches[id].scroll_y_active = false;
 276
 277                         /* Reset acceleration after half a second. */
 278                         if (scroll_acceleration && time_before(now,
 279                                                 msc->scroll_jiffies + HZ / 2))
 280                                 msc->scroll_accel = max_t(int,
 281                                                 msc->scroll_accel - 1, 1);
 282                         else
 283                                 msc->scroll_accel = SCROLL_ACCEL_DEFAULT;
 284
 285                         break;
 286                 case TOUCH_STATE_DRAG:
 287                         step_x /= (64 - (int)scroll_speed) * msc->scroll_accel;
 288                         if (step_x != 0) {
 289                                 msc->touches[id].scroll_x -= step_x *
 290                                         (64 - scroll_speed) * msc->scroll_accel;
 291                                 msc->scroll_jiffies = now;
 292                                 input_report_rel(input, REL_HWHEEL, -step_x);
 293                         }
 294
 295                         step_y /= (64 - (int)scroll_speed) * msc->scroll_accel;
 296                         if (step_y != 0) {
 297                                 msc->touches[id].scroll_y -= step_y *
 298                                         (64 - scroll_speed) * msc->scroll_accel;
 299                                 msc->scroll_jiffies = now;
 300                                 input_report_rel(input, REL_WHEEL, step_y);
 301                         }
 302
 303                         if (!msc->touches[id].scroll_x_active &&
 304                             abs(step_x_hr) > SCROLL_HR_THRESHOLD) {
 305                                 msc->touches[id].scroll_x_active = true;
 306                                 msc->touches[id].scroll_x_hr = x;
 307                                 step_x_hr = 0;
 308                         }
 309
 310                         step_x_hr /= step_hr;
 311                         if (step_x_hr != 0 &&
 312                             msc->touches[id].scroll_x_active) {
 313                                 msc->touches[id].scroll_x_hr -= step_x_hr *
 314                                         step_hr;
 315                                 input_report_rel(input,
 316                                                  REL_HWHEEL_HI_RES,
 317                                                  -step_x_hr * SCROLL_HR_MULT);
 318                         }
 319
 320                         if (!msc->touches[id].scroll_y_active &&
 321                             abs(step_y_hr) > SCROLL_HR_THRESHOLD) {
 322                                 msc->touches[id].scroll_y_active = true;
 323                                 msc->touches[id].scroll_y_hr = y;
 324                                 step_y_hr = 0;
 325                         }
 326
 327                         step_y_hr /= step_hr;
 328                         if (step_y_hr != 0 &&
 329                             msc->touches[id].scroll_y_active) {
 330                                 msc->touches[id].scroll_y_hr -= step_y_hr *
 331                                         step_hr;
 332                                 input_report_rel(input,
 333                                                  REL_WHEEL_HI_RES,
 334                                                  step_y_hr * SCROLL_HR_MULT);
 335                         }
 336                         break;
 337                 }
 338         }
 339
 340         if (down)
 341                 msc->ntouches++;
 342
 343         input_mt_slot(input, id);
 344         input_mt_report_slot_state(input, MT_TOOL_FINGER, down);
 345
 346         /* Generate the input events for this touch. */
 347         if (down) {
 348                 input_report_abs(input, ABS_MT_TOUCH_MAJOR, touch_major << 2);
 349                 input_report_abs(input, ABS_MT_TOUCH_MINOR, touch_minor << 2);
 350                 input_report_abs(input, ABS_MT_ORIENTATION, -orientation);
 351                 input_report_abs(input, ABS_MT_POSITION_X, x);
 352                 input_report_abs(input, ABS_MT_POSITION_Y, y);
 353
 354                 if (input->id.product == USB_DEVICE_ID_APPLE_MAGICTRACKPAD2)
 355                         input_report_abs(input, ABS_MT_PRESSURE, pressure);
 356
 357                 if (report_undeciphered) {
 358                         if (input->id.product == USB_DEVICE_ID_APPLE_MAGICMOUSE ||
 359                             input->id.product == USB_DEVICE_ID_APPLE_MAGICMOUSE2)
 360                                 input_event(input, EV_MSC, MSC_RAW, tdata[7]);
 361                         else if (input->id.product !=
 362                                         USB_DEVICE_ID_APPLE_MAGICTRACKPAD2)
 363                                 input_event(input, EV_MSC, MSC_RAW, tdata[8]);
 364                 }
 365         }
 366 }
 367
 368 static int magicmouse_raw_event(struct hid_device *hdev,
 369                 struct hid_report *report, u8 *data, int size)
 370 {
 371         struct magicmouse_sc *msc = hid_get_drvdata(hdev);
 372         struct input_dev *input = msc->input;
 373         int x = 0, y = 0, ii, clicks = 0, npoints;
 374
 375         switch (data[0]) {
 376         case TRACKPAD_REPORT_ID:
 377         case TRACKPAD2_BT_REPORT_ID:
 378                 /* Expect four bytes of prefix, and N*9 bytes of touch data. */
 379                 if (size < 4 || ((size - 4) % 9) != 0)
 380                         return 0;
 381                 npoints = (size - 4) / 9;
 382                 if (npoints > 15) {
 383                         hid_warn(hdev, "invalid size value (%d) for TRACKPAD_REPORT_ID\n",
 384                                         size);
 385                         return 0;
 386                 }
 387                 msc->ntouches = 0;
 388                 for (ii = 0; ii < npoints; ii++)
 389                         magicmouse_emit_touch(msc, ii, data + ii * 9 + 4);
 390
 391                 clicks = data[1];
 392
 393                 /* The following bits provide a device specific timestamp. They
 394                  * are unused here.
 395                  *
 396                  * ts = data[1] >> 6 | data[2] << 2 | data[3] << 10;
 397                  */
 398                 break;
 399         case TRACKPAD2_USB_REPORT_ID:
 400                 /* Expect twelve bytes of prefix and N*9 bytes of touch data. */
 401                 if (size < 12 || ((size - 12) % 9) != 0)
 402                         return 0;
 403                 npoints = (size - 12) / 9;
 404                 if (npoints > 15) {
 405                         hid_warn(hdev, "invalid size value (%d) for TRACKPAD2_USB_REPORT_ID\n",
 406                                         size);
 407                         return 0;
 408                 }
 409                 msc->ntouches = 0;
 410                 for (ii = 0; ii < npoints; ii++)
 411                         magicmouse_emit_touch(msc, ii, data + ii * 9 + 12);
 412
 413                 clicks = data[1];
 414                 break;
 415         case MOUSE_REPORT_ID:
 416                 /* Expect six bytes of prefix, and N*8 bytes of touch data. */
 417                 if (size < 6 || ((size - 6) % 8) != 0)
 418                         return 0;
 419                 npoints = (size - 6) / 8;
 420                 if (npoints > 15) {
 421                         hid_warn(hdev, "invalid size value (%d) for MOUSE_REPORT_ID\n",
 422                                         size);
 423                         return 0;
 424                 }
 425                 msc->ntouches = 0;
 426                 for (ii = 0; ii < npoints; ii++)
 427                         magicmouse_emit_touch(msc, ii, data + ii * 8 + 6);
 428
 429                 /* When emulating three-button mode, it is important
 430                  * to have the current touch information before
 431                  * generating a click event.
 432                  */
 433                 x = (int)(((data[3] & 0x0c) << 28) | (data[1] << 22)) >> 22;
 434                 y = (int)(((data[3] & 0x30) << 26) | (data[2] << 22)) >> 22;
 435                 clicks = data[3];
 436
 437                 /* The following bits provide a device specific timestamp. They
 438                  * are unused here.
 439                  *
 440                  * ts = data[3] >> 6 | data[4] << 2 | data[5] << 10;
 441                  */
 442                 break;
 443         case MOUSE2_REPORT_ID:
 444                 /* Size is either 8 or (14 + 8 * N) */
 445                 if (size != 8 && (size < 14 || (size - 14) % 8 != 0))
 446                         return 0;
 447                 npoints = (size - 14) / 8;
 448                 if (npoints > 15) {
 449                         hid_warn(hdev, "invalid size value (%d) for MOUSE2_REPORT_ID\n",
 450                                         size);
 451                         return 0;
 452                 }
 453                 msc->ntouches = 0;
 454                 for (ii = 0; ii < npoints; ii++)
 455                         magicmouse_emit_touch(msc, ii, data + ii * 8 + 14);
 456
 457                 /* When emulating three-button mode, it is important
 458                  * to have the current touch information before
 459                  * generating a click event.
 460                  */
 461                 x = (int)((data[3] << 24) | (data[2] << 16)) >> 16;
 462                 y = (int)((data[5] << 24) | (data[4] << 16)) >> 16;
 463                 clicks = data[1];
 464
 465                 /* The following bits provide a device specific timestamp. They
 466                  * are unused here.
 467                  *
 468                  * ts = data[11] >> 6 | data[12] << 2 | data[13] << 10;
 469                  */
 470                 break;
 471         case DOUBLE_REPORT_ID:
 472                 /* Sometimes the trackpad sends two touch reports in one
 473                  * packet.
 474                  */
 475                 magicmouse_raw_event(hdev, report, data + 2, data[1]);
 476                 magicmouse_raw_event(hdev, report, data + 2 + data[1],
 477                         size - 2 - data[1]);
 478                 break;
 479         default:
 480                 return 0;
 481         }
 482
 483         if (input->id.product == USB_DEVICE_ID_APPLE_MAGICMOUSE ||
 484             input->id.product == USB_DEVICE_ID_APPLE_MAGICMOUSE2) {
 485                 magicmouse_emit_buttons(msc, clicks & 3);
 486                 input_report_rel(input, REL_X, x);
 487                 input_report_rel(input, REL_Y, y);
 488         } else if (input->id.product == USB_DEVICE_ID_APPLE_MAGICTRACKPAD2) {
 489                 input_mt_sync_frame(input);
 490                 input_report_key(input, BTN_MOUSE, clicks & 1);
 491         } else { /* USB_DEVICE_ID_APPLE_MAGICTRACKPAD */
 492                 input_report_key(input, BTN_MOUSE, clicks & 1);
 493                 input_mt_report_pointer_emulation(input, true);
 494         }
 495
 496         input_sync(input);
 497         return 1;
 498 }
 499
 500 static int magicmouse_event(struct hid_device *hdev, struct hid_field *field,
 501                 struct hid_usage *usage, __s32 value)
 502 {
 503         struct magicmouse_sc *msc = hid_get_drvdata(hdev);
 504         if (msc->input->id.product == USB_DEVICE_ID_APPLE_MAGICMOUSE2 &&
 505             field->report->id == MOUSE2_REPORT_ID) {
 506                 /*
 507                  * magic_mouse_raw_event has done all the work. Skip hidinput.
 508                  *
 509                  * Specifically, hidinput may modify BTN_LEFT and BTN_RIGHT,
 510                  * breaking emulate_3button.
 511                  */
 512                 return 1;
 513         }
 514         return 0;
 515 }
 516
 517 static int magicmouse_setup_input(struct input_dev *input, struct hid_device *hdev)
 518 {
 519         int error;
 520         int mt_flags = 0;
 521
 522         __set_bit(EV_KEY, input->evbit);
 523
 524         if (input->id.product == USB_DEVICE_ID_APPLE_MAGICMOUSE ||
 525             input->id.product == USB_DEVICE_ID_APPLE_MAGICMOUSE2) {
 526                 __set_bit(BTN_LEFT, input->keybit);
 527                 __set_bit(BTN_RIGHT, input->keybit);
 528                 if (emulate_3button)
 529                         __set_bit(BTN_MIDDLE, input->keybit);
 530
 531                 __set_bit(EV_REL, input->evbit);
 532                 __set_bit(REL_X, input->relbit);
 533                 __set_bit(REL_Y, input->relbit);
 534                 if (emulate_scroll_wheel) {
 535                         __set_bit(REL_WHEEL, input->relbit);
 536                         __set_bit(REL_HWHEEL, input->relbit);
 537                         __set_bit(REL_WHEEL_HI_RES, input->relbit);
 538                         __set_bit(REL_HWHEEL_HI_RES, input->relbit);
 539                 }
 540         } else if (input->id.product == USB_DEVICE_ID_APPLE_MAGICTRACKPAD2) {
 541                 /* setting the device name to ensure the same driver settings
 542                  * get loaded, whether connected through bluetooth or USB
 543                  */
 544                 input->name = "Apple Inc. Magic Trackpad 2";
 545
 546                 __clear_bit(EV_MSC, input->evbit);
 547                 __clear_bit(BTN_0, input->keybit);
 548                 __clear_bit(BTN_RIGHT, input->keybit);
 549                 __clear_bit(BTN_MIDDLE, input->keybit);
 550                 __set_bit(BTN_MOUSE, input->keybit);
 551                 __set_bit(INPUT_PROP_BUTTONPAD, input->propbit);
 552                 __set_bit(BTN_TOOL_FINGER, input->keybit);
 553
 554                 mt_flags = INPUT_MT_POINTER | INPUT_MT_DROP_UNUSED |
 555                                 INPUT_MT_TRACK;
 556         } else { /* USB_DEVICE_ID_APPLE_MAGICTRACKPAD */
 557                 /* input->keybit is initialized with incorrect button info
 558                  * for Magic Trackpad. There really is only one physical
 559                  * button (BTN_LEFT == BTN_MOUSE). Make sure we don't
 560                  * advertise buttons that don't exist...
 561                  */
 562                 __clear_bit(BTN_RIGHT, input->keybit);
 563                 __clear_bit(BTN_MIDDLE, input->keybit);
 564                 __set_bit(BTN_MOUSE, input->keybit);
 565                 __set_bit(BTN_TOOL_FINGER, input->keybit);
 566                 __set_bit(BTN_TOOL_DOUBLETAP, input->keybit);
 567                 __set_bit(BTN_TOOL_TRIPLETAP, input->keybit);
 568                 __set_bit(BTN_TOOL_QUADTAP, input->keybit);
 569                 __set_bit(BTN_TOOL_QUINTTAP, input->keybit);
 570                 __set_bit(BTN_TOUCH, input->keybit);
 571                 __set_bit(INPUT_PROP_POINTER, input->propbit);
 572                 __set_bit(INPUT_PROP_BUTTONPAD, input->propbit);
 573         }
 574
 575
 576         __set_bit(EV_ABS, input->evbit);
 577
 578         error = input_mt_init_slots(input, 16, mt_flags);
 579         if (error)
 580                 return error;
 581         input_set_abs_params(input, ABS_MT_TOUCH_MAJOR, 0, 255 << 2,
 582                              4, 0);
 583         input_set_abs_params(input, ABS_MT_TOUCH_MINOR, 0, 255 << 2,
 584                              4, 0);
 585
 586         /* Note: Touch Y position from the device is inverted relative
 587          * to how pointer motion is reported (and relative to how USB
 588          * HID recommends the coordinates work).  This driver keeps
 589          * the origin at the same position, and just uses the additive
 590          * inverse of the reported Y.
 591          */
 592         if (input->id.product == USB_DEVICE_ID_APPLE_MAGICMOUSE ||
 593             input->id.product == USB_DEVICE_ID_APPLE_MAGICMOUSE2) {
 594                 input_set_abs_params(input, ABS_MT_ORIENTATION, -31, 32, 1, 0);
 595                 input_set_abs_params(input, ABS_MT_POSITION_X,
 596                                      MOUSE_MIN_X, MOUSE_MAX_X, 4, 0);
 597                 input_set_abs_params(input, ABS_MT_POSITION_Y,
 598                                      MOUSE_MIN_Y, MOUSE_MAX_Y, 4, 0);
 599
 600                 input_abs_set_res(input, ABS_MT_POSITION_X,
 601                                   MOUSE_RES_X);
 602                 input_abs_set_res(input, ABS_MT_POSITION_Y,
 603                                   MOUSE_RES_Y);
 604         } else if (input->id.product ==  USB_DEVICE_ID_APPLE_MAGICTRACKPAD2) {
 605                 input_set_abs_params(input, ABS_MT_PRESSURE, 0, 253, 0, 0);
 606                 input_set_abs_params(input, ABS_PRESSURE, 0, 253, 0, 0);
 607                 input_set_abs_params(input, ABS_MT_ORIENTATION, -3, 4, 0, 0);
 608                 input_set_abs_params(input, ABS_X, TRACKPAD2_MIN_X,
 609                                      TRACKPAD2_MAX_X, 0, 0);
 610                 input_set_abs_params(input, ABS_Y, TRACKPAD2_MIN_Y,
 611                                      TRACKPAD2_MAX_Y, 0, 0);
 612                 input_set_abs_params(input, ABS_MT_POSITION_X,
 613                                      TRACKPAD2_MIN_X, TRACKPAD2_MAX_X, 0, 0);
 614                 input_set_abs_params(input, ABS_MT_POSITION_Y,
 615                                      TRACKPAD2_MIN_Y, TRACKPAD2_MAX_Y, 0, 0);
 616
 617                 input_abs_set_res(input, ABS_X, TRACKPAD2_RES_X);
 618                 input_abs_set_res(input, ABS_Y, TRACKPAD2_RES_Y);
 619                 input_abs_set_res(input, ABS_MT_POSITION_X, TRACKPAD2_RES_X);
 620                 input_abs_set_res(input, ABS_MT_POSITION_Y, TRACKPAD2_RES_Y);
 621         } else { /* USB_DEVICE_ID_APPLE_MAGICTRACKPAD */
 622                 input_set_abs_params(input, ABS_MT_ORIENTATION, -31, 32, 1, 0);
 623                 input_set_abs_params(input, ABS_X, TRACKPAD_MIN_X,
 624                                      TRACKPAD_MAX_X, 4, 0);
 625                 input_set_abs_params(input, ABS_Y, TRACKPAD_MIN_Y,
 626                                      TRACKPAD_MAX_Y, 4, 0);
 627                 input_set_abs_params(input, ABS_MT_POSITION_X,
 628                                      TRACKPAD_MIN_X, TRACKPAD_MAX_X, 4, 0);
 629                 input_set_abs_params(input, ABS_MT_POSITION_Y,
 630                                      TRACKPAD_MIN_Y, TRACKPAD_MAX_Y, 4, 0);
 631
 632                 input_abs_set_res(input, ABS_X, TRACKPAD_RES_X);
 633                 input_abs_set_res(input, ABS_Y, TRACKPAD_RES_Y);
 634                 input_abs_set_res(input, ABS_MT_POSITION_X,
 635                                   TRACKPAD_RES_X);
 636                 input_abs_set_res(input, ABS_MT_POSITION_Y,
 637                                   TRACKPAD_RES_Y);
 638         }
 639
 640         input_set_events_per_packet(input, 60);
 641
 642         if (report_undeciphered &&
 643             input->id.product != USB_DEVICE_ID_APPLE_MAGICTRACKPAD2) {
 644                 __set_bit(EV_MSC, input->evbit);
 645                 __set_bit(MSC_RAW, input->mscbit);
 646         }
 647
 648         /*
 649          * hid-input may mark device as using autorepeat, but neither
 650          * the trackpad, nor the mouse actually want it.
 651          */
 652         __clear_bit(EV_REP, input->evbit);
 653
 654         return 0;
 655 }
 656
 657 static int magicmouse_input_mapping(struct hid_device *hdev,
 658                 struct hid_input *hi, struct hid_field *field,
 659                 struct hid_usage *usage, unsigned long **bit, int *max)
 660 {
 661         struct magicmouse_sc *msc = hid_get_drvdata(hdev);
 662
 663         if (!msc->input)
 664                 msc->input = hi->input;
 665
 666         /* Magic Trackpad does not give relative data after switching to MT */
 667         if ((hi->input->id.product == USB_DEVICE_ID_APPLE_MAGICTRACKPAD ||
 668              hi->input->id.product == USB_DEVICE_ID_APPLE_MAGICTRACKPAD2) &&
 669             field->flags & HID_MAIN_ITEM_RELATIVE)
 670                 return -1;
 671
 672         return 0;
 673 }
 674
 675 static int magicmouse_input_configured(struct hid_device *hdev,
 676                 struct hid_input *hi)
 677
 678 {
 679         struct magicmouse_sc *msc = hid_get_drvdata(hdev);
 680         int ret;
 681
 682         ret = magicmouse_setup_input(msc->input, hdev);
 683         if (ret) {
 684                 hid_err(hdev, "magicmouse setup input failed (%d)\n", ret);
 685                 /* clean msc->input to notify probe() of the failure */
 686                 msc->input = NULL;
 687                 return ret;
 688         }
 689
 690         return 0;
 691 }
 692
 693 static int magicmouse_enable_multitouch(struct hid_device *hdev)
 694 {
 695         const u8 *feature;
 696         const u8 feature_mt[] = { 0xD7, 0x01 };
 697         const u8 feature_mt_mouse2[] = { 0xF1, 0x02, 0x01 };
 698         const u8 feature_mt_trackpad2_usb[] = { 0x02, 0x01 };
 699         const u8 feature_mt_trackpad2_bt[] = { 0xF1, 0x02, 0x01 };
 700         u8 *buf;
 701         int ret;
 702         int feature_size;
 703
 704         if (hdev->product == USB_DEVICE_ID_APPLE_MAGICTRACKPAD2) {
 705                 if (hdev->vendor == BT_VENDOR_ID_APPLE) {
 706                         feature_size = sizeof(feature_mt_trackpad2_bt);
 707                         feature = feature_mt_trackpad2_bt;
 708                 } else { /* USB_VENDOR_ID_APPLE */
 709                         feature_size = sizeof(feature_mt_trackpad2_usb);
 710                         feature = feature_mt_trackpad2_usb;
 711                 }
 712         } else if (hdev->product == USB_DEVICE_ID_APPLE_MAGICMOUSE2) {
 713                 feature_size = sizeof(feature_mt_mouse2);
 714                 feature = feature_mt_mouse2;
 715         } else {
 716                 feature_size = sizeof(feature_mt);
 717                 feature = feature_mt;
 718         }
 719
 720         buf = kmemdup(feature, feature_size, GFP_KERNEL);
 721         if (!buf)
 722                 return -ENOMEM;
 723
 724         ret = hid_hw_raw_request(hdev, buf[0], buf, feature_size,
 725                                 HID_FEATURE_REPORT, HID_REQ_SET_REPORT);
 726         kfree(buf);
 727         return ret;
 728 }
 729
 730 static void magicmouse_enable_mt_work(struct work_struct *work)
 731 {
 732         struct magicmouse_sc *msc =
 733                 container_of(work, struct magicmouse_sc, work.work);
 734         int ret;
 735
 736         ret = magicmouse_enable_multitouch(msc->hdev);
 737         if (ret < 0)
 738                 hid_err(msc->hdev, "unable to request touch data (%d)\n", ret);
 739 }
 740
 741 static int magicmouse_probe(struct hid_device *hdev,
 742         const struct hid_device_id *id)
 743 {
 744         struct magicmouse_sc *msc;
 745         struct hid_report *report;
 746         int ret;
 747
 748         if (id->vendor == USB_VENDOR_ID_APPLE &&
 749             id->product == USB_DEVICE_ID_APPLE_MAGICTRACKPAD2 &&
 750             hdev->type != HID_TYPE_USBMOUSE)
 751                 return -ENODEV;
 752
 753         msc = devm_kzalloc(&hdev->dev, sizeof(*msc), GFP_KERNEL);
 754         if (msc == NULL) {
 755                 hid_err(hdev, "can't alloc magicmouse descriptor\n");
 756                 return -ENOMEM;
 757         }
 758
 759         msc->scroll_accel = SCROLL_ACCEL_DEFAULT;
 760         msc->hdev = hdev;
 761         INIT_DEFERRABLE_WORK(&msc->work, magicmouse_enable_mt_work);
 762
 763         msc->quirks = id->driver_data;
 764         hid_set_drvdata(hdev, msc);
 765
 766         ret = hid_parse(hdev);
 767         if (ret) {
 768                 hid_err(hdev, "magicmouse hid parse failed\n");
 769                 return ret;
 770         }
 771
 772         ret = hid_hw_start(hdev, HID_CONNECT_DEFAULT);
 773         if (ret) {
 774                 hid_err(hdev, "magicmouse hw start failed\n");
 775                 return ret;
 776         }
 777
 778         if (!msc->input) {
 779                 hid_err(hdev, "magicmouse input not registered\n");
 780                 ret = -ENOMEM;
 781                 goto err_stop_hw;
 782         }
 783
 784         if (id->product == USB_DEVICE_ID_APPLE_MAGICMOUSE)
 785                 report = hid_register_report(hdev, HID_INPUT_REPORT,
 786                         MOUSE_REPORT_ID, 0);
 787         else if (id->product == USB_DEVICE_ID_APPLE_MAGICMOUSE2)
 788                 report = hid_register_report(hdev, HID_INPUT_REPORT,
 789                         MOUSE2_REPORT_ID, 0);
 790         else if (id->product == USB_DEVICE_ID_APPLE_MAGICTRACKPAD2) {
 791                 if (id->vendor == BT_VENDOR_ID_APPLE)
 792                         report = hid_register_report(hdev, HID_INPUT_REPORT,
 793                                 TRACKPAD2_BT_REPORT_ID, 0);
 794                 else /* USB_VENDOR_ID_APPLE */
 795                         report = hid_register_report(hdev, HID_INPUT_REPORT,
 796                                 TRACKPAD2_USB_REPORT_ID, 0);
 797         } else { /* USB_DEVICE_ID_APPLE_MAGICTRACKPAD */
 798                 report = hid_register_report(hdev, HID_INPUT_REPORT,
 799                         TRACKPAD_REPORT_ID, 0);
 800                 report = hid_register_report(hdev, HID_INPUT_REPORT,
 801                         DOUBLE_REPORT_ID, 0);
 802         }
 803
 804         if (!report) {
 805                 hid_err(hdev, "unable to register touch report\n");
 806                 ret = -ENOMEM;
 807                 goto err_stop_hw;
 808         }
 809         report->size = 6;
 810
 811         /*
 812          * Some devices repond with 'invalid report id' when feature
 813          * report switching it into multitouch mode is sent to it.
 814          *
 815          * This results in -EIO from the _raw low-level transport callback,
 816          * but there seems to be no other way of switching the mode.
 817          * Thus the super-ugly hacky success check below.
 818          */
 819         ret = magicmouse_enable_multitouch(hdev);
 820         if (ret != -EIO && ret < 0) {
 821                 hid_err(hdev, "unable to request touch data (%d)\n", ret);
 822                 goto err_stop_hw;
 823         }
 824         if (ret == -EIO && id->product == USB_DEVICE_ID_APPLE_MAGICMOUSE2) {
 825                 schedule_delayed_work(&msc->work, msecs_to_jiffies(500));
 826         }
 827
 828         return 0;
 829 err_stop_hw:
 830         hid_hw_stop(hdev);
 831         return ret;
 832 }
 833
 834 static void magicmouse_remove(struct hid_device *hdev)
 835 {
 836         struct magicmouse_sc *msc = hid_get_drvdata(hdev);
 837
 838         if (msc)
 839                 cancel_delayed_work_sync(&msc->work);
 840
 841         hid_hw_stop(hdev);
 842 }
 843
 844 static const struct hid_device_id magic_mice[] = {
 845         { HID_BLUETOOTH_DEVICE(USB_VENDOR_ID_APPLE,
 846                 USB_DEVICE_ID_APPLE_MAGICMOUSE), .driver_data = 0 },
 847         { HID_BLUETOOTH_DEVICE(BT_VENDOR_ID_APPLE,
 848                 USB_DEVICE_ID_APPLE_MAGICMOUSE2), .driver_data = 0 },
 849         { HID_BLUETOOTH_DEVICE(USB_VENDOR_ID_APPLE,
 850                 USB_DEVICE_ID_APPLE_MAGICTRACKPAD), .driver_data = 0 },
 851         { HID_BLUETOOTH_DEVICE(BT_VENDOR_ID_APPLE,
 852                 USB_DEVICE_ID_APPLE_MAGICTRACKPAD2), .driver_data = 0 },
 853         { HID_USB_DEVICE(USB_VENDOR_ID_APPLE,
 854                 USB_DEVICE_ID_APPLE_MAGICTRACKPAD2), .driver_data = 0 },
 855         { }
 856 };
 857 MODULE_DEVICE_TABLE(hid, magic_mice);
 858
 859 static struct hid_driver magicmouse_driver = {
 860         .name = "magicmouse",
 861         .id_table = magic_mice,
 862         .probe = magicmouse_probe,
 863         .remove = magicmouse_remove,
 864         .raw_event = magicmouse_raw_event,
 865         .event = magicmouse_event,
 866         .input_mapping = magicmouse_input_mapping,
 867         .input_configured = magicmouse_input_configured,
 868 };
 869 module_hid_driver(magicmouse_driver);
 870
 871 MODULE_LICENSE("GPL");