linux/drivers/hid/hid-magicmouse.c
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   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/module.h>
  20#include <linux/slab.h>
  21#include <linux/usb.h>
  22
  23#include "hid-ids.h"
  24
  25static bool emulate_3button = true;
  26module_param(emulate_3button, bool, 0644);
  27MODULE_PARM_DESC(emulate_3button, "Emulate a middle button");
  28
  29static int middle_button_start = -350;
  30static int middle_button_stop = +350;
  31
  32static bool emulate_scroll_wheel = true;
  33module_param(emulate_scroll_wheel, bool, 0644);
  34MODULE_PARM_DESC(emulate_scroll_wheel, "Emulate a scroll wheel");
  35
  36static unsigned int scroll_speed = 32;
  37static int param_set_scroll_speed(const char *val, struct kernel_param *kp) {
  38        unsigned long speed;
  39        if (!val || strict_strtoul(val, 0, &speed) || speed > 63)
  40                return -EINVAL;
  41        scroll_speed = speed;
  42        return 0;
  43}
  44module_param_call(scroll_speed, param_set_scroll_speed, param_get_uint, &scroll_speed, 0644);
  45MODULE_PARM_DESC(scroll_speed, "Scroll speed, value from 0 (slow) to 63 (fast)");
  46
  47static bool scroll_acceleration = false;
  48module_param(scroll_acceleration, bool, 0644);
  49MODULE_PARM_DESC(scroll_acceleration, "Accelerate sequential scroll events");
  50
  51static bool report_touches = true;
  52module_param(report_touches, bool, 0644);
  53MODULE_PARM_DESC(report_touches, "Emit touch records (otherwise, only use them for emulation)");
  54
  55static bool report_undeciphered;
  56module_param(report_undeciphered, bool, 0644);
  57MODULE_PARM_DESC(report_undeciphered, "Report undeciphered multi-touch state field using a MSC_RAW event");
  58
  59#define TRACKPAD_REPORT_ID 0x28
  60#define MOUSE_REPORT_ID    0x29
  61#define DOUBLE_REPORT_ID   0xf7
  62/* These definitions are not precise, but they're close enough.  (Bits
  63 * 0x03 seem to indicate the aspect ratio of the touch, bits 0x70 seem
  64 * to be some kind of bit mask -- 0x20 may be a near-field reading,
  65 * and 0x40 is actual contact, and 0x10 may be a start/stop or change
  66 * indication.)
  67 */
  68#define TOUCH_STATE_MASK  0xf0
  69#define TOUCH_STATE_NONE  0x00
  70#define TOUCH_STATE_START 0x30
  71#define TOUCH_STATE_DRAG  0x40
  72
  73#define SCROLL_ACCEL_DEFAULT 7
  74
  75/* Single touch emulation should only begin when no touches are currently down.
  76 * This is true when single_touch_id is equal to NO_TOUCHES. If multiple touches
  77 * are down and the touch providing for single touch emulation is lifted,
  78 * single_touch_id is equal to SINGLE_TOUCH_UP. While single touch emulation is
  79 * occurring, single_touch_id corresponds with the tracking id of the touch used.
  80 */
  81#define NO_TOUCHES -1
  82#define SINGLE_TOUCH_UP -2
  83
  84/* Touch surface information. Dimension is in hundredths of a mm, min and max
  85 * are in units. */
  86#define MOUSE_DIMENSION_X (float)9056
  87#define MOUSE_MIN_X -1100
  88#define MOUSE_MAX_X 1258
  89#define MOUSE_RES_X ((MOUSE_MAX_X - MOUSE_MIN_X) / (MOUSE_DIMENSION_X / 100))
  90#define MOUSE_DIMENSION_Y (float)5152
  91#define MOUSE_MIN_Y -1589
  92#define MOUSE_MAX_Y 2047
  93#define MOUSE_RES_Y ((MOUSE_MAX_Y - MOUSE_MIN_Y) / (MOUSE_DIMENSION_Y / 100))
  94
  95#define TRACKPAD_DIMENSION_X (float)13000
  96#define TRACKPAD_MIN_X -2909
  97#define TRACKPAD_MAX_X 3167
  98#define TRACKPAD_RES_X \
  99        ((TRACKPAD_MAX_X - TRACKPAD_MIN_X) / (TRACKPAD_DIMENSION_X / 100))
 100#define TRACKPAD_DIMENSION_Y (float)11000
 101#define TRACKPAD_MIN_Y -2456
 102#define TRACKPAD_MAX_Y 2565
 103#define TRACKPAD_RES_Y \
 104        ((TRACKPAD_MAX_Y - TRACKPAD_MIN_Y) / (TRACKPAD_DIMENSION_Y / 100))
 105
 106/**
 107 * struct magicmouse_sc - Tracks Magic Mouse-specific data.
 108 * @input: Input device through which we report events.
 109 * @quirks: Currently unused.
 110 * @ntouches: Number of touches in most recent touch report.
 111 * @scroll_accel: Number of consecutive scroll motions.
 112 * @scroll_jiffies: Time of last scroll motion.
 113 * @touches: Most recent data for a touch, indexed by tracking ID.
 114 * @tracking_ids: Mapping of current touch input data to @touches.
 115 */
 116struct magicmouse_sc {
 117        struct input_dev *input;
 118        unsigned long quirks;
 119
 120        int ntouches;
 121        int scroll_accel;
 122        unsigned long scroll_jiffies;
 123
 124        struct {
 125                short x;
 126                short y;
 127                short scroll_x;
 128                short scroll_y;
 129                u8 size;
 130        } touches[16];
 131        int tracking_ids[16];
 132        int single_touch_id;
 133};
 134
 135static int magicmouse_firm_touch(struct magicmouse_sc *msc)
 136{
 137        int touch = -1;
 138        int ii;
 139
 140        /* If there is only one "firm" touch, set touch to its
 141         * tracking ID.
 142         */
 143        for (ii = 0; ii < msc->ntouches; ii++) {
 144                int idx = msc->tracking_ids[ii];
 145                if (msc->touches[idx].size < 8) {
 146                        /* Ignore this touch. */
 147                } else if (touch >= 0) {
 148                        touch = -1;
 149                        break;
 150                } else {
 151                        touch = idx;
 152                }
 153        }
 154
 155        return touch;
 156}
 157
 158static void magicmouse_emit_buttons(struct magicmouse_sc *msc, int state)
 159{
 160        int last_state = test_bit(BTN_LEFT, msc->input->key) << 0 |
 161                test_bit(BTN_RIGHT, msc->input->key) << 1 |
 162                test_bit(BTN_MIDDLE, msc->input->key) << 2;
 163
 164        if (emulate_3button) {
 165                int id;
 166
 167                /* If some button was pressed before, keep it held
 168                 * down.  Otherwise, if there's exactly one firm
 169                 * touch, use that to override the mouse's guess.
 170                 */
 171                if (state == 0) {
 172                        /* The button was released. */
 173                } else if (last_state != 0) {
 174                        state = last_state;
 175                } else if ((id = magicmouse_firm_touch(msc)) >= 0) {
 176                        int x = msc->touches[id].x;
 177                        if (x < middle_button_start)
 178                                state = 1;
 179                        else if (x > middle_button_stop)
 180                                state = 2;
 181                        else
 182                                state = 4;
 183                } /* else: we keep the mouse's guess */
 184
 185                input_report_key(msc->input, BTN_MIDDLE, state & 4);
 186        }
 187
 188        input_report_key(msc->input, BTN_LEFT, state & 1);
 189        input_report_key(msc->input, BTN_RIGHT, state & 2);
 190
 191        if (state != last_state)
 192                msc->scroll_accel = SCROLL_ACCEL_DEFAULT;
 193}
 194
 195static void magicmouse_emit_touch(struct magicmouse_sc *msc, int raw_id, u8 *tdata)
 196{
 197        struct input_dev *input = msc->input;
 198        int id, x, y, size, orientation, touch_major, touch_minor, state, down;
 199
 200        if (input->id.product == USB_DEVICE_ID_APPLE_MAGICMOUSE) {
 201                id = (tdata[6] << 2 | tdata[5] >> 6) & 0xf;
 202                x = (tdata[1] << 28 | tdata[0] << 20) >> 20;
 203                y = -((tdata[2] << 24 | tdata[1] << 16) >> 20);
 204                size = tdata[5] & 0x3f;
 205                orientation = (tdata[6] >> 2) - 32;
 206                touch_major = tdata[3];
 207                touch_minor = tdata[4];
 208                state = tdata[7] & TOUCH_STATE_MASK;
 209                down = state != TOUCH_STATE_NONE;
 210        } else { /* USB_DEVICE_ID_APPLE_MAGICTRACKPAD */
 211                id = (tdata[7] << 2 | tdata[6] >> 6) & 0xf;
 212                x = (tdata[1] << 27 | tdata[0] << 19) >> 19;
 213                y = -((tdata[3] << 30 | tdata[2] << 22 | tdata[1] << 14) >> 19);
 214                size = tdata[6] & 0x3f;
 215                orientation = (tdata[7] >> 2) - 32;
 216                touch_major = tdata[4];
 217                touch_minor = tdata[5];
 218                state = tdata[8] & TOUCH_STATE_MASK;
 219                down = state != TOUCH_STATE_NONE;
 220        }
 221
 222        /* Store tracking ID and other fields. */
 223        msc->tracking_ids[raw_id] = id;
 224        msc->touches[id].x = x;
 225        msc->touches[id].y = y;
 226        msc->touches[id].size = size;
 227
 228        /* If requested, emulate a scroll wheel by detecting small
 229         * vertical touch motions.
 230         */
 231        if (emulate_scroll_wheel) {
 232                unsigned long now = jiffies;
 233                int step_x = msc->touches[id].scroll_x - x;
 234                int step_y = msc->touches[id].scroll_y - y;
 235
 236                /* Calculate and apply the scroll motion. */
 237                switch (state) {
 238                case TOUCH_STATE_START:
 239                        msc->touches[id].scroll_x = x;
 240                        msc->touches[id].scroll_y = y;
 241
 242                        /* Reset acceleration after half a second. */
 243                        if (scroll_acceleration && time_before(now,
 244                                                msc->scroll_jiffies + HZ / 2))
 245                                msc->scroll_accel = max_t(int,
 246                                                msc->scroll_accel - 1, 1);
 247                        else
 248                                msc->scroll_accel = SCROLL_ACCEL_DEFAULT;
 249
 250                        break;
 251                case TOUCH_STATE_DRAG:
 252                        step_x /= (64 - (int)scroll_speed) * msc->scroll_accel;
 253                        if (step_x != 0) {
 254                                msc->touches[id].scroll_x -= step_x *
 255                                        (64 - scroll_speed) * msc->scroll_accel;
 256                                msc->scroll_jiffies = now;
 257                                input_report_rel(input, REL_HWHEEL, -step_x);
 258                        }
 259
 260                        step_y /= (64 - (int)scroll_speed) * msc->scroll_accel;
 261                        if (step_y != 0) {
 262                                msc->touches[id].scroll_y -= step_y *
 263                                        (64 - scroll_speed) * msc->scroll_accel;
 264                                msc->scroll_jiffies = now;
 265                                input_report_rel(input, REL_WHEEL, step_y);
 266                        }
 267                        break;
 268                }
 269        }
 270
 271        if (down) {
 272                msc->ntouches++;
 273                if (msc->single_touch_id == NO_TOUCHES)
 274                        msc->single_touch_id = id;
 275        } else if (msc->single_touch_id == id)
 276                msc->single_touch_id = SINGLE_TOUCH_UP;
 277
 278        /* Generate the input events for this touch. */
 279        if (report_touches && down) {
 280                input_report_abs(input, ABS_MT_TRACKING_ID, id);
 281                input_report_abs(input, ABS_MT_TOUCH_MAJOR, touch_major << 2);
 282                input_report_abs(input, ABS_MT_TOUCH_MINOR, touch_minor << 2);
 283                input_report_abs(input, ABS_MT_ORIENTATION, -orientation);
 284                input_report_abs(input, ABS_MT_POSITION_X, x);
 285                input_report_abs(input, ABS_MT_POSITION_Y, y);
 286
 287                if (report_undeciphered) {
 288                        if (input->id.product == USB_DEVICE_ID_APPLE_MAGICMOUSE)
 289                                input_event(input, EV_MSC, MSC_RAW, tdata[7]);
 290                        else /* USB_DEVICE_ID_APPLE_MAGICTRACKPAD */
 291                                input_event(input, EV_MSC, MSC_RAW, tdata[8]);
 292                }
 293
 294                input_mt_sync(input);
 295        }
 296}
 297
 298static int magicmouse_raw_event(struct hid_device *hdev,
 299                struct hid_report *report, u8 *data, int size)
 300{
 301        struct magicmouse_sc *msc = hid_get_drvdata(hdev);
 302        struct input_dev *input = msc->input;
 303        int x = 0, y = 0, ii, clicks = 0, npoints;
 304
 305        switch (data[0]) {
 306        case TRACKPAD_REPORT_ID:
 307                /* Expect four bytes of prefix, and N*9 bytes of touch data. */
 308                if (size < 4 || ((size - 4) % 9) != 0)
 309                        return 0;
 310                npoints = (size - 4) / 9;
 311                msc->ntouches = 0;
 312                for (ii = 0; ii < npoints; ii++)
 313                        magicmouse_emit_touch(msc, ii, data + ii * 9 + 4);
 314
 315                /* We don't need an MT sync here because trackpad emits a
 316                 * BTN_TOUCH event in a new frame when all touches are released.
 317                 */
 318                if (msc->ntouches == 0)
 319                        msc->single_touch_id = NO_TOUCHES;
 320
 321                clicks = data[1];
 322
 323                /* The following bits provide a device specific timestamp. They
 324                 * are unused here.
 325                 *
 326                 * ts = data[1] >> 6 | data[2] << 2 | data[3] << 10;
 327                 */
 328                break;
 329        case MOUSE_REPORT_ID:
 330                /* Expect six bytes of prefix, and N*8 bytes of touch data. */
 331                if (size < 6 || ((size - 6) % 8) != 0)
 332                        return 0;
 333                npoints = (size - 6) / 8;
 334                msc->ntouches = 0;
 335                for (ii = 0; ii < npoints; ii++)
 336                        magicmouse_emit_touch(msc, ii, data + ii * 8 + 6);
 337
 338                if (report_touches && msc->ntouches == 0)
 339                        input_mt_sync(input);
 340
 341                /* When emulating three-button mode, it is important
 342                 * to have the current touch information before
 343                 * generating a click event.
 344                 */
 345                x = (int)(((data[3] & 0x0c) << 28) | (data[1] << 22)) >> 22;
 346                y = (int)(((data[3] & 0x30) << 26) | (data[2] << 22)) >> 22;
 347                clicks = data[3];
 348
 349                /* The following bits provide a device specific timestamp. They
 350                 * are unused here.
 351                 *
 352                 * ts = data[3] >> 6 | data[4] << 2 | data[5] << 10;
 353                 */
 354                break;
 355        case DOUBLE_REPORT_ID:
 356                /* Sometimes the trackpad sends two touch reports in one
 357                 * packet.
 358                 */
 359                magicmouse_raw_event(hdev, report, data + 2, data[1]);
 360                magicmouse_raw_event(hdev, report, data + 2 + data[1],
 361                        size - 2 - data[1]);
 362                break;
 363        default:
 364                return 0;
 365        }
 366
 367        if (input->id.product == USB_DEVICE_ID_APPLE_MAGICMOUSE) {
 368                magicmouse_emit_buttons(msc, clicks & 3);
 369                input_report_rel(input, REL_X, x);
 370                input_report_rel(input, REL_Y, y);
 371        } else { /* USB_DEVICE_ID_APPLE_MAGICTRACKPAD */
 372                input_report_key(input, BTN_MOUSE, clicks & 1);
 373                input_report_key(input, BTN_TOUCH, msc->ntouches > 0);
 374                input_report_key(input, BTN_TOOL_FINGER, msc->ntouches == 1);
 375                input_report_key(input, BTN_TOOL_DOUBLETAP, msc->ntouches == 2);
 376                input_report_key(input, BTN_TOOL_TRIPLETAP, msc->ntouches == 3);
 377                input_report_key(input, BTN_TOOL_QUADTAP, msc->ntouches == 4);
 378                if (msc->single_touch_id >= 0) {
 379                        input_report_abs(input, ABS_X,
 380                                msc->touches[msc->single_touch_id].x);
 381                        input_report_abs(input, ABS_Y,
 382                                msc->touches[msc->single_touch_id].y);
 383                }
 384        }
 385
 386        input_sync(input);
 387        return 1;
 388}
 389
 390static void magicmouse_setup_input(struct input_dev *input, struct hid_device *hdev)
 391{
 392        __set_bit(EV_KEY, input->evbit);
 393
 394        if (input->id.product == USB_DEVICE_ID_APPLE_MAGICMOUSE) {
 395                __set_bit(BTN_LEFT, input->keybit);
 396                __set_bit(BTN_RIGHT, input->keybit);
 397                if (emulate_3button)
 398                        __set_bit(BTN_MIDDLE, input->keybit);
 399
 400                __set_bit(EV_REL, input->evbit);
 401                __set_bit(REL_X, input->relbit);
 402                __set_bit(REL_Y, input->relbit);
 403                if (emulate_scroll_wheel) {
 404                        __set_bit(REL_WHEEL, input->relbit);
 405                        __set_bit(REL_HWHEEL, input->relbit);
 406                }
 407        } else { /* USB_DEVICE_ID_APPLE_MAGICTRACKPAD */
 408                /* input->keybit is initialized with incorrect button info
 409                 * for Magic Trackpad. There really is only one physical
 410                 * button (BTN_LEFT == BTN_MOUSE). Make sure we don't
 411                 * advertise buttons that don't exist...
 412                 */
 413                __clear_bit(BTN_RIGHT, input->keybit);
 414                __clear_bit(BTN_MIDDLE, input->keybit);
 415                __set_bit(BTN_MOUSE, input->keybit);
 416                __set_bit(BTN_TOOL_FINGER, input->keybit);
 417                __set_bit(BTN_TOOL_DOUBLETAP, input->keybit);
 418                __set_bit(BTN_TOOL_TRIPLETAP, input->keybit);
 419                __set_bit(BTN_TOOL_QUADTAP, input->keybit);
 420                __set_bit(BTN_TOUCH, input->keybit);
 421        }
 422
 423        if (report_touches) {
 424                __set_bit(EV_ABS, input->evbit);
 425
 426                input_set_abs_params(input, ABS_MT_TRACKING_ID, 0, 15, 0, 0);
 427                input_set_abs_params(input, ABS_MT_TOUCH_MAJOR, 0, 255, 4, 0);
 428                input_set_abs_params(input, ABS_MT_TOUCH_MINOR, 0, 255, 4, 0);
 429                input_set_abs_params(input, ABS_MT_ORIENTATION, -31, 32, 1, 0);
 430
 431                /* Note: Touch Y position from the device is inverted relative
 432                 * to how pointer motion is reported (and relative to how USB
 433                 * HID recommends the coordinates work).  This driver keeps
 434                 * the origin at the same position, and just uses the additive
 435                 * inverse of the reported Y.
 436                 */
 437                if (input->id.product == USB_DEVICE_ID_APPLE_MAGICMOUSE) {
 438                        input_set_abs_params(input, ABS_MT_POSITION_X,
 439                                MOUSE_MIN_X, MOUSE_MAX_X, 4, 0);
 440                        input_set_abs_params(input, ABS_MT_POSITION_Y,
 441                                MOUSE_MIN_Y, MOUSE_MAX_Y, 4, 0);
 442
 443                        input_abs_set_res(input, ABS_MT_POSITION_X,
 444                                MOUSE_RES_X);
 445                        input_abs_set_res(input, ABS_MT_POSITION_Y,
 446                                MOUSE_RES_Y);
 447                } else { /* USB_DEVICE_ID_APPLE_MAGICTRACKPAD */
 448                        input_set_abs_params(input, ABS_X, TRACKPAD_MIN_X,
 449                                TRACKPAD_MAX_X, 4, 0);
 450                        input_set_abs_params(input, ABS_Y, TRACKPAD_MIN_Y,
 451                                TRACKPAD_MAX_Y, 4, 0);
 452                        input_set_abs_params(input, ABS_MT_POSITION_X,
 453                                TRACKPAD_MIN_X, TRACKPAD_MAX_X, 4, 0);
 454                        input_set_abs_params(input, ABS_MT_POSITION_Y,
 455                                TRACKPAD_MIN_Y, TRACKPAD_MAX_Y, 4, 0);
 456
 457                        input_abs_set_res(input, ABS_X, TRACKPAD_RES_X);
 458                        input_abs_set_res(input, ABS_Y, TRACKPAD_RES_Y);
 459                        input_abs_set_res(input, ABS_MT_POSITION_X,
 460                                TRACKPAD_RES_X);
 461                        input_abs_set_res(input, ABS_MT_POSITION_Y,
 462                                TRACKPAD_RES_Y);
 463                }
 464
 465                input_set_events_per_packet(input, 60);
 466        }
 467
 468        if (report_undeciphered) {
 469                __set_bit(EV_MSC, input->evbit);
 470                __set_bit(MSC_RAW, input->mscbit);
 471        }
 472}
 473
 474static int magicmouse_input_mapping(struct hid_device *hdev,
 475                struct hid_input *hi, struct hid_field *field,
 476                struct hid_usage *usage, unsigned long **bit, int *max)
 477{
 478        struct magicmouse_sc *msc = hid_get_drvdata(hdev);
 479
 480        if (!msc->input)
 481                msc->input = hi->input;
 482
 483        /* Magic Trackpad does not give relative data after switching to MT */
 484        if (hi->input->id.product == USB_DEVICE_ID_APPLE_MAGICTRACKPAD &&
 485            field->flags & HID_MAIN_ITEM_RELATIVE)
 486                return -1;
 487
 488        return 0;
 489}
 490
 491static int magicmouse_probe(struct hid_device *hdev,
 492        const struct hid_device_id *id)
 493{
 494        __u8 feature[] = { 0xd7, 0x01 };
 495        struct magicmouse_sc *msc;
 496        struct hid_report *report;
 497        int ret;
 498
 499        msc = kzalloc(sizeof(*msc), GFP_KERNEL);
 500        if (msc == NULL) {
 501                hid_err(hdev, "can't alloc magicmouse descriptor\n");
 502                return -ENOMEM;
 503        }
 504
 505        msc->scroll_accel = SCROLL_ACCEL_DEFAULT;
 506
 507        msc->quirks = id->driver_data;
 508        hid_set_drvdata(hdev, msc);
 509
 510        msc->single_touch_id = NO_TOUCHES;
 511
 512        ret = hid_parse(hdev);
 513        if (ret) {
 514                hid_err(hdev, "magicmouse hid parse failed\n");
 515                goto err_free;
 516        }
 517
 518        ret = hid_hw_start(hdev, HID_CONNECT_DEFAULT);
 519        if (ret) {
 520                hid_err(hdev, "magicmouse hw start failed\n");
 521                goto err_free;
 522        }
 523
 524        /* We do this after hid-input is done parsing reports so that
 525         * hid-input uses the most natural button and axis IDs.
 526         */
 527        if (msc->input)
 528                magicmouse_setup_input(msc->input, hdev);
 529
 530        if (id->product == USB_DEVICE_ID_APPLE_MAGICMOUSE)
 531                report = hid_register_report(hdev, HID_INPUT_REPORT,
 532                        MOUSE_REPORT_ID);
 533        else { /* USB_DEVICE_ID_APPLE_MAGICTRACKPAD */
 534                report = hid_register_report(hdev, HID_INPUT_REPORT,
 535                        TRACKPAD_REPORT_ID);
 536                report = hid_register_report(hdev, HID_INPUT_REPORT,
 537                        DOUBLE_REPORT_ID);
 538        }
 539
 540        if (!report) {
 541                hid_err(hdev, "unable to register touch report\n");
 542                ret = -ENOMEM;
 543                goto err_stop_hw;
 544        }
 545        report->size = 6;
 546
 547        /*
 548         * Some devices repond with 'invalid report id' when feature
 549         * report switching it into multitouch mode is sent to it.
 550         *
 551         * This results in -EIO from the _raw low-level transport callback,
 552         * but there seems to be no other way of switching the mode.
 553         * Thus the super-ugly hacky success check below.
 554         */
 555        ret = hdev->hid_output_raw_report(hdev, feature, sizeof(feature),
 556                        HID_FEATURE_REPORT);
 557        if (ret != -EIO && ret != sizeof(feature)) {
 558                hid_err(hdev, "unable to request touch data (%d)\n", ret);
 559                goto err_stop_hw;
 560        }
 561
 562        return 0;
 563err_stop_hw:
 564        hid_hw_stop(hdev);
 565err_free:
 566        kfree(msc);
 567        return ret;
 568}
 569
 570static void magicmouse_remove(struct hid_device *hdev)
 571{
 572        struct magicmouse_sc *msc = hid_get_drvdata(hdev);
 573
 574        hid_hw_stop(hdev);
 575        kfree(msc);
 576}
 577
 578static const struct hid_device_id magic_mice[] = {
 579        { HID_BLUETOOTH_DEVICE(USB_VENDOR_ID_APPLE,
 580                USB_DEVICE_ID_APPLE_MAGICMOUSE), .driver_data = 0 },
 581        { HID_BLUETOOTH_DEVICE(USB_VENDOR_ID_APPLE,
 582                USB_DEVICE_ID_APPLE_MAGICTRACKPAD), .driver_data = 0 },
 583        { }
 584};
 585MODULE_DEVICE_TABLE(hid, magic_mice);
 586
 587static struct hid_driver magicmouse_driver = {
 588        .name = "magicmouse",
 589        .id_table = magic_mice,
 590        .probe = magicmouse_probe,
 591        .remove = magicmouse_remove,
 592        .raw_event = magicmouse_raw_event,
 593        .input_mapping = magicmouse_input_mapping,
 594};
 595
 596static int __init magicmouse_init(void)
 597{
 598        int ret;
 599
 600        ret = hid_register_driver(&magicmouse_driver);
 601        if (ret)
 602                pr_err("can't register magicmouse driver\n");
 603
 604        return ret;
 605}
 606
 607static void __exit magicmouse_exit(void)
 608{
 609        hid_unregister_driver(&magicmouse_driver);
 610}
 611
 612module_init(magicmouse_init);
 613module_exit(magicmouse_exit);
 614MODULE_LICENSE("GPL");
 615