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   1 /*
   2  *   Apple "Magic" Wireless Mouse driver
   3  *
   4  *   Copyright (c) 2010 Michael Poole <mdpoole@troilus.org>
   5  */
   6
   7 /*
   8  * This program is free software; you can redistribute it and/or modify it
   9  * under the terms of the GNU General Public License as published by the Free
  10  * Software Foundation; either version 2 of the License, or (at your option)
  11  * any later version.
  12  */
  13
  14 #include <linux/device.h>
  15 #include <linux/hid.h>
  16 #include <linux/module.h>
  17 #include <linux/usb.h>
  18
  19 #include "hid-ids.h"
  20
  21 static bool emulate_3button = 1;
  22 module_param(emulate_3button, bool, 0644);
  23 MODULE_PARM_DESC(emulate_3button, "Emulate a middle button");
  24
  25 static int middle_button_start = -350;
  26 static int middle_button_stop = +350;
  27
  28 static bool emulate_scroll_wheel = 1;
  29 module_param(emulate_scroll_wheel, bool, 0644);
  30 MODULE_PARM_DESC(emulate_scroll_wheel, "Emulate a scroll wheel");
  31
  32 static bool report_touches = 1;
  33 module_param(report_touches, bool, 0644);
  34 MODULE_PARM_DESC(report_touches, "Emit touch records (otherwise, only use them for emulation)");
  35
  36 static bool report_undeciphered = 0;
  37 module_param(report_undeciphered, bool, 0644);
  38 MODULE_PARM_DESC(report_undeciphered, "Report undeciphered multi-touch state field using a MSC_RAW event");
  39
  40 #define TOUCH_REPORT_ID   0x29
  41 /* These definitions are not precise, but they're close enough.  (Bits
  42  * 0x03 seem to indicate the aspect ratio of the touch, bits 0x70 seem
  43  * to be some kind of bit mask -- 0x20 may be a near-field reading,
  44  * and 0x40 is actual contact, and 0x10 may be a start/stop or change
  45  * indication.)
  46  */
  47 #define TOUCH_STATE_MASK  0xf0
  48 #define TOUCH_STATE_NONE  0x00
  49 #define TOUCH_STATE_START 0x30
  50 #define TOUCH_STATE_DRAG  0x40
  51
  52 /**
  53  * struct magicmouse_sc - Tracks Magic Mouse-specific data.
  54  * @input: Input device through which we report events.
  55  * @quirks: Currently unused.
  56  * @last_timestamp: Timestamp from most recent (18-bit) touch report
  57  *     (units of milliseconds over short windows, but seems to
  58  *     increase faster when there are no touches).
  59  * @delta_time: 18-bit difference between the two most recent touch
  60  *     reports from the mouse.
  61  * @ntouches: Number of touches in most recent touch report.
  62  * @scroll_accel: Number of consecutive scroll motions.
  63  * @scroll_jiffies: Time of last scroll motion.
  64  * @touches: Most recent data for a touch, indexed by tracking ID.
  65  * @tracking_ids: Mapping of current touch input data to @touches.
  66  */
  67 struct magicmouse_sc {
  68         struct input_dev *input;
  69         unsigned long quirks;
  70
  71         int last_timestamp;
  72         int delta_time;
  73         int ntouches;
  74         int scroll_accel;
  75         unsigned long scroll_jiffies;
  76
  77         struct {
  78                 short x;
  79                 short y;
  80                 short scroll_y;
  81                 u8 size;
  82         } touches[16];
  83         int tracking_ids[16];
  84 };
  85
  86 static int magicmouse_firm_touch(struct magicmouse_sc *msc)
  87 {
  88         int touch = -1;
  89         int ii;
  90
  91         /* If there is only one "firm" touch, set touch to its
  92          * tracking ID.
  93          */
  94         for (ii = 0; ii < msc->ntouches; ii++) {
  95                 int idx = msc->tracking_ids[ii];
  96                 if (msc->touches[idx].size < 8) {
  97                         /* Ignore this touch. */
  98                 } else if (touch >= 0) {
  99                         touch = -1;
 100                         break;
 101                 } else {
 102                         touch = idx;
 103                 }
 104         }
 105
 106         return touch;
 107 }
 108
 109 static void magicmouse_emit_buttons(struct magicmouse_sc *msc, int state)
 110 {
 111         int last_state = test_bit(BTN_LEFT, msc->input->key) << 0 |
 112                 test_bit(BTN_RIGHT, msc->input->key) << 1 |
 113                 test_bit(BTN_MIDDLE, msc->input->key) << 2;
 114
 115         if (emulate_3button) {
 116                 int id;
 117
 118                 /* If some button was pressed before, keep it held
 119                  * down.  Otherwise, if there's exactly one firm
 120                  * touch, use that to override the mouse's guess.
 121                  */
 122                 if (state == 0) {
 123                         /* The button was released. */
 124                 } else if (last_state != 0) {
 125                         state = last_state;
 126                 } else if ((id = magicmouse_firm_touch(msc)) >= 0) {
 127                         int x = msc->touches[id].x;
 128                         if (x < middle_button_start)
 129                                 state = 1;
 130                         else if (x > middle_button_stop)
 131                                 state = 2;
 132                         else
 133                                 state = 4;
 134                 } /* else: we keep the mouse's guess */
 135
 136                 input_report_key(msc->input, BTN_MIDDLE, state & 4);
 137         }
 138
 139         input_report_key(msc->input, BTN_LEFT, state & 1);
 140         input_report_key(msc->input, BTN_RIGHT, state & 2);
 141
 142         if (state != last_state)
 143                 msc->scroll_accel = 0;
 144 }
 145
 146 static void magicmouse_emit_touch(struct magicmouse_sc *msc, int raw_id, u8 *tdata)
 147 {
 148         struct input_dev *input = msc->input;
 149         __s32 x_y = tdata[0] << 8 | tdata[1] << 16 | tdata[2] << 24;
 150         int misc = tdata[5] | tdata[6] << 8;
 151         int id = (misc >> 6) & 15;
 152         int x = x_y << 12 >> 20;
 153         int y = -(x_y >> 20);
 154
 155         /* Store tracking ID and other fields. */
 156         msc->tracking_ids[raw_id] = id;
 157         msc->touches[id].x = x;
 158         msc->touches[id].y = y;
 159         msc->touches[id].size = misc & 63;
 160
 161         /* If requested, emulate a scroll wheel by detecting small
 162          * vertical touch motions along the middle of the mouse.
 163          */
 164         if (emulate_scroll_wheel &&
 165             middle_button_start < x && x < middle_button_stop) {
 166                 static const int accel_profile[] = {
 167                         256, 228, 192, 160, 128, 96, 64, 32,
 168                 };
 169                 unsigned long now = jiffies;
 170                 int step = msc->touches[id].scroll_y - y;
 171
 172                 /* Reset acceleration after half a second. */
 173                 if (time_after(now, msc->scroll_jiffies + HZ / 2))
 174                         msc->scroll_accel = 0;
 175
 176                 /* Calculate and apply the scroll motion. */
 177                 switch (tdata[7] & TOUCH_STATE_MASK) {
 178                 case TOUCH_STATE_START:
 179                         msc->touches[id].scroll_y = y;
 180                         msc->scroll_accel = min_t(int, msc->scroll_accel + 1,
 181                                                 ARRAY_SIZE(accel_profile) - 1);
 182                         break;
 183                 case TOUCH_STATE_DRAG:
 184                         step = step / accel_profile[msc->scroll_accel];
 185                         if (step != 0) {
 186                                 msc->touches[id].scroll_y = y;
 187                                 msc->scroll_jiffies = now;
 188                                 input_report_rel(input, REL_WHEEL, step);
 189                         }
 190                         break;
 191                 }
 192         }
 193
 194         /* Generate the input events for this touch. */
 195         if (report_touches) {
 196                 int orientation = (misc >> 10) - 32;
 197
 198                 input_report_abs(input, ABS_MT_TRACKING_ID, id);
 199                 input_report_abs(input, ABS_MT_TOUCH_MAJOR, tdata[3]);
 200                 input_report_abs(input, ABS_MT_TOUCH_MINOR, tdata[4]);
 201                 input_report_abs(input, ABS_MT_ORIENTATION, orientation);
 202                 input_report_abs(input, ABS_MT_POSITION_X, x);
 203                 input_report_abs(input, ABS_MT_POSITION_Y, y);
 204
 205                 if (report_undeciphered) {
 206                         input_event(input, EV_MSC, MSC_RAW, tdata[7]);
 207                 }
 208
 209                 input_mt_sync(input);
 210         }
 211 }
 212
 213 static int magicmouse_raw_event(struct hid_device *hdev,
 214                 struct hid_report *report, u8 *data, int size)
 215 {
 216         struct magicmouse_sc *msc = hid_get_drvdata(hdev);
 217         struct input_dev *input = msc->input;
 218         int x, y, ts, ii, clicks;
 219
 220         switch (data[0]) {
 221         case 0x10:
 222                 if (size != 6)
 223                         return 0;
 224                 x = (__s16)(data[2] | data[3] << 8);
 225                 y = (__s16)(data[4] | data[5] << 8);
 226                 clicks = data[1];
 227                 break;
 228         case TOUCH_REPORT_ID:
 229                 /* Expect six bytes of prefix, and N*8 bytes of touch data. */
 230                 if (size < 6 || ((size - 6) % 8) != 0)
 231                         return 0;
 232                 ts = data[3] >> 6 | data[4] << 2 | data[5] << 10;
 233                 msc->delta_time = (ts - msc->last_timestamp) & 0x3ffff;
 234                 msc->last_timestamp = ts;
 235                 msc->ntouches = (size - 6) / 8;
 236                 for (ii = 0; ii < msc->ntouches; ii++)
 237                         magicmouse_emit_touch(msc, ii, data + ii * 8 + 6);
 238                 /* When emulating three-button mode, it is important
 239                  * to have the current touch information before
 240                  * generating a click event.
 241                  */
 242                 x = (signed char)data[1];
 243                 y = (signed char)data[2];
 244                 clicks = data[3];
 245                 break;
 246         case 0x20: /* Theoretically battery status (0-100), but I have
 247                     * never seen it -- maybe it is only upon request.
 248                     */
 249         case 0x60: /* Unknown, maybe laser on/off. */
 250         case 0x61: /* Laser reflection status change.
 251                     * data[1]: 0 = spotted, 1 = lost
 252                     */
 253         default:
 254                 return 0;
 255         }
 256
 257         magicmouse_emit_buttons(msc, clicks & 3);
 258         input_report_rel(input, REL_X, x);
 259         input_report_rel(input, REL_Y, y);
 260         input_sync(input);
 261         return 1;
 262 }
 263
 264 static int magicmouse_input_open(struct input_dev *dev)
 265 {
 266         struct hid_device *hid = input_get_drvdata(dev);
 267
 268         return hid->ll_driver->open(hid);
 269 }
 270
 271 static void magicmouse_input_close(struct input_dev *dev)
 272 {
 273         struct hid_device *hid = input_get_drvdata(dev);
 274
 275         hid->ll_driver->close(hid);
 276 }
 277
 278 static void magicmouse_setup_input(struct input_dev *input, struct hid_device *hdev)
 279 {
 280         input_set_drvdata(input, hdev);
 281         input->event = hdev->ll_driver->hidinput_input_event;
 282         input->open = magicmouse_input_open;
 283         input->close = magicmouse_input_close;
 284
 285         input->name = hdev->name;
 286         input->phys = hdev->phys;
 287         input->uniq = hdev->uniq;
 288         input->id.bustype = hdev->bus;
 289         input->id.vendor = hdev->vendor;
 290         input->id.product = hdev->product;
 291         input->id.version = hdev->version;
 292         input->dev.parent = hdev->dev.parent;
 293
 294         set_bit(EV_KEY, input->evbit);
 295         set_bit(BTN_LEFT, input->keybit);
 296         set_bit(BTN_RIGHT, input->keybit);
 297         if (emulate_3button)
 298                 set_bit(BTN_MIDDLE, input->keybit);
 299         set_bit(BTN_TOOL_FINGER, input->keybit);
 300
 301         set_bit(EV_REL, input->evbit);
 302         set_bit(REL_X, input->relbit);
 303         set_bit(REL_Y, input->relbit);
 304         if (emulate_scroll_wheel)
 305                 set_bit(REL_WHEEL, input->relbit);
 306
 307         if (report_touches) {
 308                 set_bit(EV_ABS, input->evbit);
 309
 310                 set_bit(ABS_MT_TRACKING_ID, input->absbit);
 311                 input->absmin[ABS_MT_TRACKING_ID] = 0;
 312                 input->absmax[ABS_MT_TRACKING_ID] = 15;
 313                 input->absfuzz[ABS_MT_TRACKING_ID] = 0;
 314
 315                 set_bit(ABS_MT_TOUCH_MAJOR, input->absbit);
 316                 input->absmin[ABS_MT_TOUCH_MAJOR] = 0;
 317                 input->absmax[ABS_MT_TOUCH_MAJOR] = 255;
 318                 input->absfuzz[ABS_MT_TOUCH_MAJOR] = 4;
 319
 320                 set_bit(ABS_MT_TOUCH_MINOR, input->absbit);
 321                 input->absmin[ABS_MT_TOUCH_MINOR] = 0;
 322                 input->absmax[ABS_MT_TOUCH_MINOR] = 255;
 323                 input->absfuzz[ABS_MT_TOUCH_MINOR] = 4;
 324
 325                 set_bit(ABS_MT_ORIENTATION, input->absbit);
 326                 input->absmin[ABS_MT_ORIENTATION] = -32;
 327                 input->absmax[ABS_MT_ORIENTATION] = 31;
 328                 input->absfuzz[ABS_MT_ORIENTATION] = 1;
 329
 330                 set_bit(ABS_MT_POSITION_X, input->absbit);
 331                 input->absmin[ABS_MT_POSITION_X] = -1100;
 332                 input->absmax[ABS_MT_POSITION_X] = 1358;
 333                 input->absfuzz[ABS_MT_POSITION_X] = 4;
 334
 335                 /* Note: Touch Y position from the device is inverted relative
 336                  * to how pointer motion is reported (and relative to how USB
 337                  * HID recommends the coordinates work).  This driver keeps
 338                  * the origin at the same position, and just uses the additive
 339                  * inverse of the reported Y.
 340                  */
 341                 set_bit(ABS_MT_POSITION_Y, input->absbit);
 342                 input->absmin[ABS_MT_POSITION_Y] = -1589;
 343                 input->absmax[ABS_MT_POSITION_Y] = 2047;
 344                 input->absfuzz[ABS_MT_POSITION_Y] = 4;
 345         }
 346
 347         if (report_undeciphered) {
 348                 set_bit(EV_MSC, input->evbit);
 349                 set_bit(MSC_RAW, input->mscbit);
 350         }
 351 }
 352
 353 static int magicmouse_probe(struct hid_device *hdev,
 354         const struct hid_device_id *id)
 355 {
 356         __u8 feature_1[] = { 0xd7, 0x01 };
 357         __u8 feature_2[] = { 0xf8, 0x01, 0x32 };
 358         struct input_dev *input;
 359         struct magicmouse_sc *msc;
 360         struct hid_report *report;
 361         int ret;
 362
 363         msc = kzalloc(sizeof(*msc), GFP_KERNEL);
 364         if (msc == NULL) {
 365                 dev_err(&hdev->dev, "can't alloc magicmouse descriptor\n");
 366                 return -ENOMEM;
 367         }
 368
 369         msc->quirks = id->driver_data;
 370         hid_set_drvdata(hdev, msc);
 371
 372         ret = hid_parse(hdev);
 373         if (ret) {
 374                 dev_err(&hdev->dev, "magicmouse hid parse failed\n");
 375                 goto err_free;
 376         }
 377
 378         ret = hid_hw_start(hdev, HID_CONNECT_DEFAULT);
 379         if (ret) {
 380                 dev_err(&hdev->dev, "magicmouse hw start failed\n");
 381                 goto err_free;
 382         }
 383
 384         report = hid_register_report(hdev, HID_INPUT_REPORT, TOUCH_REPORT_ID);
 385         if (!report) {
 386                 dev_err(&hdev->dev, "unable to register touch report\n");
 387                 ret = -ENOMEM;
 388                 goto err_free;
 389         }
 390         report->size = 6;
 391
 392         ret = hdev->hid_output_raw_report(hdev, feature_1, sizeof(feature_1),
 393                         HID_FEATURE_REPORT);
 394         if (ret != sizeof(feature_1)) {
 395                 dev_err(&hdev->dev, "unable to request touch data (1:%d)\n",
 396                                 ret);
 397                 goto err_free;
 398         }
 399         ret = hdev->hid_output_raw_report(hdev, feature_2,
 400                         sizeof(feature_2), HID_FEATURE_REPORT);
 401         if (ret != sizeof(feature_2)) {
 402                 dev_err(&hdev->dev, "unable to request touch data (2:%d)\n",
 403                                 ret);
 404                 goto err_free;
 405         }
 406
 407         input = input_allocate_device();
 408         if (!input) {
 409                 dev_err(&hdev->dev, "can't alloc input device\n");
 410                 ret = -ENOMEM;
 411                 goto err_free;
 412         }
 413         magicmouse_setup_input(input, hdev);
 414
 415         ret = input_register_device(input);
 416         if (ret) {
 417                 dev_err(&hdev->dev, "input device registration failed\n");
 418                 goto err_both;
 419         }
 420         msc->input = input;
 421
 422         return 0;
 423  err_both:
 424         input_free_device(input);
 425  err_free:
 426         kfree(msc);
 427         return ret;
 428 }
 429
 430 static void magicmouse_remove(struct hid_device *hdev)
 431 {
 432         hid_hw_stop(hdev);
 433         kfree(hid_get_drvdata(hdev));
 434 }
 435
 436 static const struct hid_device_id magic_mice[] = {
 437         { HID_BLUETOOTH_DEVICE(USB_VENDOR_ID_APPLE, USB_DEVICE_ID_APPLE_MAGICMOUSE),
 438                 .driver_data = 0 },
 439         { }
 440 };
 441 MODULE_DEVICE_TABLE(hid, magic_mice);
 442
 443 static struct hid_driver magicmouse_driver = {
 444         .name = "magicmouse",
 445         .id_table = magic_mice,
 446         .probe = magicmouse_probe,
 447         .remove = magicmouse_remove,
 448         .raw_event = magicmouse_raw_event,
 449 };
 450
 451 static int __init magicmouse_init(void)
 452 {
 453         int ret;
 454
 455         ret = hid_register_driver(&magicmouse_driver);
 456         if (ret)
 457                 printk(KERN_ERR "can't register magicmouse driver\n");
 458
 459         return ret;
 460 }
 461
 462 static void __exit magicmouse_exit(void)
 463 {
 464         hid_unregister_driver(&magicmouse_driver);
 465 }
 466
 467 module_init(magicmouse_init);
 468 module_exit(magicmouse_exit);
 469 MODULE_LICENSE("GPL");