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 #include <linux/device.h>
  16 #include <linux/hid.h>
  17 #include <linux/module.h>
  18 #include <linux/slab.h>
  19 #include <linux/usb.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, struct kernel_param *kp) {
  36         unsigned long speed;
  37         if (!val || strict_strtoul(val, 0, &speed) || speed > 63)
  38                 return -EINVAL;
  39         scroll_speed = speed;
  40         return 0;
  41 }
  42 module_param_call(scroll_speed, param_set_scroll_speed, param_get_uint, &scroll_speed, 0644);
  43 MODULE_PARM_DESC(scroll_speed, "Scroll speed, value from 0 (slow) to 63 (fast)");
  44
  45 static bool scroll_acceleration = false;
  46 module_param(scroll_acceleration, bool, 0644);
  47 MODULE_PARM_DESC(scroll_acceleration, "Accelerate sequential scroll events");
  48
  49 static bool report_touches = true;
  50 module_param(report_touches, bool, 0644);
  51 MODULE_PARM_DESC(report_touches, "Emit touch records (otherwise, only use them for emulation)");
  52
  53 static bool report_undeciphered;
  54 module_param(report_undeciphered, bool, 0644);
  55 MODULE_PARM_DESC(report_undeciphered, "Report undeciphered multi-touch state field using a MSC_RAW event");
  56
  57 #define TRACKPAD_REPORT_ID 0x28
  58 #define MOUSE_REPORT_ID    0x29
  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 #define SCROLL_ACCEL_DEFAULT 7
  72
  73 /* Single touch emulation should only begin when no touches are currently down.
  74  * This is true when single_touch_id is equal to NO_TOUCHES. If multiple touches
  75  * are down and the touch providing for single touch emulation is lifted,
  76  * single_touch_id is equal to SINGLE_TOUCH_UP. While single touch emulation is
  77  * occuring, single_touch_id corresponds with the tracking id of the touch used.
  78  */
  79 #define NO_TOUCHES -1
  80 #define SINGLE_TOUCH_UP -2
  81
  82 /**
  83  * struct magicmouse_sc - Tracks Magic Mouse-specific data.
  84  * @input: Input device through which we report events.
  85  * @quirks: Currently unused.
  86  * @ntouches: Number of touches in most recent touch report.
  87  * @scroll_accel: Number of consecutive scroll motions.
  88  * @scroll_jiffies: Time of last scroll motion.
  89  * @touches: Most recent data for a touch, indexed by tracking ID.
  90  * @tracking_ids: Mapping of current touch input data to @touches.
  91  */
  92 struct magicmouse_sc {
  93         struct input_dev *input;
  94         unsigned long quirks;
  95
  96         int ntouches;
  97         int scroll_accel;
  98         unsigned long scroll_jiffies;
  99
 100         struct {
 101                 short x;
 102                 short y;
 103                 short scroll_x;
 104                 short scroll_y;
 105                 u8 size;
 106         } touches[16];
 107         int tracking_ids[16];
 108         int single_touch_id;
 109 };
 110
 111 static int magicmouse_firm_touch(struct magicmouse_sc *msc)
 112 {
 113         int touch = -1;
 114         int ii;
 115
 116         /* If there is only one "firm" touch, set touch to its
 117          * tracking ID.
 118          */
 119         for (ii = 0; ii < msc->ntouches; ii++) {
 120                 int idx = msc->tracking_ids[ii];
 121                 if (msc->touches[idx].size < 8) {
 122                         /* Ignore this touch. */
 123                 } else if (touch >= 0) {
 124                         touch = -1;
 125                         break;
 126                 } else {
 127                         touch = idx;
 128                 }
 129         }
 130
 131         return touch;
 132 }
 133
 134 static void magicmouse_emit_buttons(struct magicmouse_sc *msc, int state)
 135 {
 136         int last_state = test_bit(BTN_LEFT, msc->input->key) << 0 |
 137                 test_bit(BTN_RIGHT, msc->input->key) << 1 |
 138                 test_bit(BTN_MIDDLE, msc->input->key) << 2;
 139
 140         if (emulate_3button) {
 141                 int id;
 142
 143                 /* If some button was pressed before, keep it held
 144                  * down.  Otherwise, if there's exactly one firm
 145                  * touch, use that to override the mouse's guess.
 146                  */
 147                 if (state == 0) {
 148                         /* The button was released. */
 149                 } else if (last_state != 0) {
 150                         state = last_state;
 151                 } else if ((id = magicmouse_firm_touch(msc)) >= 0) {
 152                         int x = msc->touches[id].x;
 153                         if (x < middle_button_start)
 154                                 state = 1;
 155                         else if (x > middle_button_stop)
 156                                 state = 2;
 157                         else
 158                                 state = 4;
 159                 } /* else: we keep the mouse's guess */
 160
 161                 input_report_key(msc->input, BTN_MIDDLE, state & 4);
 162         }
 163
 164         input_report_key(msc->input, BTN_LEFT, state & 1);
 165         input_report_key(msc->input, BTN_RIGHT, state & 2);
 166
 167         if (state != last_state)
 168                 msc->scroll_accel = SCROLL_ACCEL_DEFAULT;
 169 }
 170
 171 static void magicmouse_emit_touch(struct magicmouse_sc *msc, int raw_id, u8 *tdata)
 172 {
 173         struct input_dev *input = msc->input;
 174         int id, x, y, size, orientation, touch_major, touch_minor, state, down;
 175
 176         if (input->id.product == USB_DEVICE_ID_APPLE_MAGICMOUSE) {
 177                 id = (tdata[6] << 2 | tdata[5] >> 6) & 0xf;
 178                 x = (tdata[1] << 28 | tdata[0] << 20) >> 20;
 179                 y = -((tdata[2] << 24 | tdata[1] << 16) >> 20);
 180                 size = tdata[5] & 0x3f;
 181                 orientation = (tdata[6] >> 2) - 32;
 182                 touch_major = tdata[3];
 183                 touch_minor = tdata[4];
 184                 state = tdata[7] & TOUCH_STATE_MASK;
 185                 down = state != TOUCH_STATE_NONE;
 186         } else { /* USB_DEVICE_ID_APPLE_MAGICTRACKPAD */
 187                 id = (tdata[7] << 2 | tdata[6] >> 6) & 0xf;
 188                 x = (tdata[1] << 27 | tdata[0] << 19) >> 19;
 189                 y = -((tdata[3] << 30 | tdata[2] << 22 | tdata[1] << 14) >> 19);
 190                 size = tdata[6] & 0x3f;
 191                 orientation = (tdata[7] >> 2) - 32;
 192                 touch_major = tdata[4];
 193                 touch_minor = tdata[5];
 194                 state = tdata[8] & TOUCH_STATE_MASK;
 195                 down = state != TOUCH_STATE_NONE;
 196         }
 197
 198         /* Store tracking ID and other fields. */
 199         msc->tracking_ids[raw_id] = id;
 200         msc->touches[id].x = x;
 201         msc->touches[id].y = y;
 202         msc->touches[id].size = size;
 203
 204         /* If requested, emulate a scroll wheel by detecting small
 205          * vertical touch motions.
 206          */
 207         if (emulate_scroll_wheel) {
 208                 unsigned long now = jiffies;
 209                 int step_x = msc->touches[id].scroll_x - x;
 210                 int step_y = msc->touches[id].scroll_y - y;
 211
 212                 /* Calculate and apply the scroll motion. */
 213                 switch (state) {
 214                 case TOUCH_STATE_START:
 215                         msc->touches[id].scroll_x = x;
 216                         msc->touches[id].scroll_y = y;
 217
 218                         /* Reset acceleration after half a second. */
 219                         if (scroll_acceleration && time_before(now,
 220                                                 msc->scroll_jiffies + HZ / 2))
 221                                 msc->scroll_accel = max_t(int,
 222                                                 msc->scroll_accel - 1, 1);
 223                         else
 224                                 msc->scroll_accel = SCROLL_ACCEL_DEFAULT;
 225
 226                         break;
 227                 case TOUCH_STATE_DRAG:
 228                         step_x /= (64 - (int)scroll_speed) * msc->scroll_accel;
 229                         if (step_x != 0) {
 230                                 msc->touches[id].scroll_x -= step_x *
 231                                         (64 - scroll_speed) * msc->scroll_accel;
 232                                 msc->scroll_jiffies = now;
 233                                 input_report_rel(input, REL_HWHEEL, -step_x);
 234                         }
 235
 236                         step_y /= (64 - (int)scroll_speed) * msc->scroll_accel;
 237                         if (step_y != 0) {
 238                                 msc->touches[id].scroll_y -= step_y *
 239                                         (64 - scroll_speed) * msc->scroll_accel;
 240                                 msc->scroll_jiffies = now;
 241                                 input_report_rel(input, REL_WHEEL, step_y);
 242                         }
 243                         break;
 244                 }
 245         }
 246
 247         if (down) {
 248                 msc->ntouches++;
 249                 if (msc->single_touch_id == NO_TOUCHES)
 250                         msc->single_touch_id = id;
 251         } else if (msc->single_touch_id == id)
 252                 msc->single_touch_id = SINGLE_TOUCH_UP;
 253
 254         /* Generate the input events for this touch. */
 255         if (report_touches && down) {
 256                 input_report_abs(input, ABS_MT_TRACKING_ID, id);
 257                 input_report_abs(input, ABS_MT_TOUCH_MAJOR, touch_major << 2);
 258                 input_report_abs(input, ABS_MT_TOUCH_MINOR, touch_minor << 2);
 259                 input_report_abs(input, ABS_MT_ORIENTATION, orientation);
 260                 input_report_abs(input, ABS_MT_POSITION_X, x);
 261                 input_report_abs(input, ABS_MT_POSITION_Y, y);
 262
 263                 if (report_undeciphered) {
 264                         if (input->id.product == USB_DEVICE_ID_APPLE_MAGICMOUSE)
 265                                 input_event(input, EV_MSC, MSC_RAW, tdata[7]);
 266                         else /* USB_DEVICE_ID_APPLE_MAGICTRACKPAD */
 267                                 input_event(input, EV_MSC, MSC_RAW, tdata[8]);
 268                 }
 269
 270                 input_mt_sync(input);
 271         }
 272 }
 273
 274 static int magicmouse_raw_event(struct hid_device *hdev,
 275                 struct hid_report *report, u8 *data, int size)
 276 {
 277         struct magicmouse_sc *msc = hid_get_drvdata(hdev);
 278         struct input_dev *input = msc->input;
 279         int x = 0, y = 0, ii, clicks = 0, npoints;
 280
 281         switch (data[0]) {
 282         case TRACKPAD_REPORT_ID:
 283                 /* Expect four bytes of prefix, and N*9 bytes of touch data. */
 284                 if (size < 4 || ((size - 4) % 9) != 0)
 285                         return 0;
 286                 npoints = (size - 4) / 9;
 287                 msc->ntouches = 0;
 288                 for (ii = 0; ii < npoints; ii++)
 289                         magicmouse_emit_touch(msc, ii, data + ii * 9 + 4);
 290
 291                 /* We don't need an MT sync here because trackpad emits a
 292                  * BTN_TOUCH event in a new frame when all touches are released.
 293                  */
 294                 if (msc->ntouches == 0)
 295                         msc->single_touch_id = NO_TOUCHES;
 296
 297                 clicks = data[1];
 298
 299                 /* The following bits provide a device specific timestamp. They
 300                  * are unused here.
 301                  *
 302                  * ts = data[1] >> 6 | data[2] << 2 | data[3] << 10;
 303                  */
 304                 break;
 305         case MOUSE_REPORT_ID:
 306                 /* Expect six bytes of prefix, and N*8 bytes of touch data. */
 307                 if (size < 6 || ((size - 6) % 8) != 0)
 308                         return 0;
 309                 npoints = (size - 6) / 8;
 310                 msc->ntouches = 0;
 311                 for (ii = 0; ii < npoints; ii++)
 312                         magicmouse_emit_touch(msc, ii, data + ii * 8 + 6);
 313
 314                 if (report_touches && msc->ntouches == 0)
 315                         input_mt_sync(input);
 316
 317                 /* When emulating three-button mode, it is important
 318                  * to have the current touch information before
 319                  * generating a click event.
 320                  */
 321                 x = (int)(((data[3] & 0x0c) << 28) | (data[1] << 22)) >> 22;
 322                 y = (int)(((data[3] & 0x30) << 26) | (data[2] << 22)) >> 22;
 323                 clicks = data[3];
 324
 325                 /* The following bits provide a device specific timestamp. They
 326                  * are unused here.
 327                  *
 328                  * ts = data[3] >> 6 | data[4] << 2 | data[5] << 10;
 329                  */
 330                 break;
 331         case DOUBLE_REPORT_ID:
 332                 /* Sometimes the trackpad sends two touch reports in one
 333                  * packet.
 334                  */
 335                 magicmouse_raw_event(hdev, report, data + 2, data[1]);
 336                 magicmouse_raw_event(hdev, report, data + 2 + data[1],
 337                         size - 2 - data[1]);
 338                 break;
 339         default:
 340                 return 0;
 341         }
 342
 343         if (input->id.product == USB_DEVICE_ID_APPLE_MAGICMOUSE) {
 344                 magicmouse_emit_buttons(msc, clicks & 3);
 345                 input_report_rel(input, REL_X, x);
 346                 input_report_rel(input, REL_Y, y);
 347         } else { /* USB_DEVICE_ID_APPLE_MAGICTRACKPAD */
 348                 input_report_key(input, BTN_MOUSE, clicks & 1);
 349                 input_report_key(input, BTN_TOUCH, msc->ntouches > 0);
 350                 input_report_key(input, BTN_TOOL_FINGER, msc->ntouches == 1);
 351                 input_report_key(input, BTN_TOOL_DOUBLETAP, msc->ntouches == 2);
 352                 input_report_key(input, BTN_TOOL_TRIPLETAP, msc->ntouches == 3);
 353                 input_report_key(input, BTN_TOOL_QUADTAP, msc->ntouches == 4);
 354                 if (msc->single_touch_id >= 0) {
 355                         input_report_abs(input, ABS_X,
 356                                 msc->touches[msc->single_touch_id].x);
 357                         input_report_abs(input, ABS_Y,
 358                                 msc->touches[msc->single_touch_id].y);
 359                 }
 360         }
 361
 362         input_sync(input);
 363         return 1;
 364 }
 365
 366 static void magicmouse_setup_input(struct input_dev *input, struct hid_device *hdev)
 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                 __set_bit(BTN_MOUSE, input->keybit);
 385                 __set_bit(BTN_TOOL_FINGER, input->keybit);
 386                 __set_bit(BTN_TOOL_DOUBLETAP, input->keybit);
 387                 __set_bit(BTN_TOOL_TRIPLETAP, input->keybit);
 388                 __set_bit(BTN_TOOL_QUADTAP, input->keybit);
 389                 __set_bit(BTN_TOUCH, input->keybit);
 390         }
 391
 392         if (report_touches) {
 393                 __set_bit(EV_ABS, input->evbit);
 394
 395                 input_set_abs_params(input, ABS_MT_TRACKING_ID, 0, 15, 0, 0);
 396                 input_set_abs_params(input, ABS_MT_TOUCH_MAJOR, 0, 255, 4, 0);
 397                 input_set_abs_params(input, ABS_MT_TOUCH_MINOR, 0, 255, 4, 0);
 398                 input_set_abs_params(input, ABS_MT_ORIENTATION, -32, 31, 1, 0);
 399
 400                 /* Note: Touch Y position from the device is inverted relative
 401                  * to how pointer motion is reported (and relative to how USB
 402                  * HID recommends the coordinates work).  This driver keeps
 403                  * the origin at the same position, and just uses the additive
 404                  * inverse of the reported Y.
 405                  */
 406                 if (input->id.product == USB_DEVICE_ID_APPLE_MAGICMOUSE) {
 407                         input_set_abs_params(input, ABS_MT_POSITION_X, -1100,
 408                                 1358, 4, 0);
 409                         input_set_abs_params(input, ABS_MT_POSITION_Y, -1589,
 410                                 2047, 4, 0);
 411                 } else { /* USB_DEVICE_ID_APPLE_MAGICTRACKPAD */
 412                         input_set_abs_params(input, ABS_X, -2909, 3167, 4, 0);
 413                         input_set_abs_params(input, ABS_Y, -2456, 2565, 4, 0);
 414                         input_set_abs_params(input, ABS_MT_POSITION_X, -2909,
 415                                 3167, 4, 0);
 416                         input_set_abs_params(input, ABS_MT_POSITION_Y, -2456,
 417                                 2565, 4, 0);
 418                 }
 419         }
 420
 421         if (report_undeciphered) {
 422                 __set_bit(EV_MSC, input->evbit);
 423                 __set_bit(MSC_RAW, input->mscbit);
 424         }
 425 }
 426
 427 static int magicmouse_input_mapping(struct hid_device *hdev,
 428                 struct hid_input *hi, struct hid_field *field,
 429                 struct hid_usage *usage, unsigned long **bit, int *max)
 430 {
 431         struct magicmouse_sc *msc = hid_get_drvdata(hdev);
 432
 433         if (!msc->input)
 434                 msc->input = hi->input;
 435
 436         return 0;
 437 }
 438
 439 static int magicmouse_probe(struct hid_device *hdev,
 440         const struct hid_device_id *id)
 441 {
 442         __u8 feature[] = { 0xd7, 0x01 };
 443         struct magicmouse_sc *msc;
 444         struct hid_report *report;
 445         int ret;
 446
 447         msc = kzalloc(sizeof(*msc), GFP_KERNEL);
 448         if (msc == NULL) {
 449                 dev_err(&hdev->dev, "can't alloc magicmouse descriptor\n");
 450                 return -ENOMEM;
 451         }
 452
 453         msc->scroll_accel = SCROLL_ACCEL_DEFAULT;
 454
 455         msc->quirks = id->driver_data;
 456         hid_set_drvdata(hdev, msc);
 457
 458         msc->single_touch_id = NO_TOUCHES;
 459
 460         ret = hid_parse(hdev);
 461         if (ret) {
 462                 dev_err(&hdev->dev, "magicmouse hid parse failed\n");
 463                 goto err_free;
 464         }
 465
 466         ret = hid_hw_start(hdev, HID_CONNECT_DEFAULT);
 467         if (ret) {
 468                 dev_err(&hdev->dev, "magicmouse hw start failed\n");
 469                 goto err_free;
 470         }
 471
 472         /* We do this after hid-input is done parsing reports so that
 473          * hid-input uses the most natural button and axis IDs.
 474          */
 475         if (msc->input)
 476                 magicmouse_setup_input(msc->input, hdev);
 477
 478         if (id->product == USB_DEVICE_ID_APPLE_MAGICMOUSE)
 479                 report = hid_register_report(hdev, HID_INPUT_REPORT,
 480                         MOUSE_REPORT_ID);
 481         else { /* USB_DEVICE_ID_APPLE_MAGICTRACKPAD */
 482                 report = hid_register_report(hdev, HID_INPUT_REPORT,
 483                         TRACKPAD_REPORT_ID);
 484                 report = hid_register_report(hdev, HID_INPUT_REPORT,
 485                         DOUBLE_REPORT_ID);
 486         }
 487
 488         if (!report) {
 489                 dev_err(&hdev->dev, "unable to register touch report\n");
 490                 ret = -ENOMEM;
 491                 goto err_stop_hw;
 492         }
 493         report->size = 6;
 494
 495         ret = hdev->hid_output_raw_report(hdev, feature, sizeof(feature),
 496                         HID_FEATURE_REPORT);
 497         if (ret != sizeof(feature)) {
 498                 dev_err(&hdev->dev, "unable to request touch data (%d)\n",
 499                                 ret);
 500                 goto err_stop_hw;
 501         }
 502
 503         return 0;
 504 err_stop_hw:
 505         hid_hw_stop(hdev);
 506 err_free:
 507         kfree(msc);
 508         return ret;
 509 }
 510
 511 static void magicmouse_remove(struct hid_device *hdev)
 512 {
 513         struct magicmouse_sc *msc = hid_get_drvdata(hdev);
 514
 515         hid_hw_stop(hdev);
 516         kfree(msc);
 517 }
 518
 519 static const struct hid_device_id magic_mice[] = {
 520         { HID_BLUETOOTH_DEVICE(USB_VENDOR_ID_APPLE,
 521                 USB_DEVICE_ID_APPLE_MAGICMOUSE), .driver_data = 0 },
 522         { HID_BLUETOOTH_DEVICE(USB_VENDOR_ID_APPLE,
 523                 USB_DEVICE_ID_APPLE_MAGICTRACKPAD), .driver_data = 0 },
 524         { }
 525 };
 526 MODULE_DEVICE_TABLE(hid, magic_mice);
 527
 528 static struct hid_driver magicmouse_driver = {
 529         .name = "magicmouse",
 530         .id_table = magic_mice,
 531         .probe = magicmouse_probe,
 532         .remove = magicmouse_remove,
 533         .raw_event = magicmouse_raw_event,
 534         .input_mapping = magicmouse_input_mapping,
 535 };
 536
 537 static int __init magicmouse_init(void)
 538 {
 539         int ret;
 540
 541         ret = hid_register_driver(&magicmouse_driver);
 542         if (ret)
 543                 printk(KERN_ERR "can't register magicmouse driver\n");
 544
 545         return ret;
 546 }
 547
 548 static void __exit magicmouse_exit(void)
 549 {
 550         hid_unregister_driver(&magicmouse_driver);
 551 }
 552
 553 module_init(magicmouse_init);
 554 module_exit(magicmouse_exit);
 555 MODULE_LICENSE("GPL");