drivers/hid/hid-multitouch.c

   1 /*
   2  *  HID driver for multitouch panels
   3  *
   4  *  Copyright (c) 2010-2011 Stephane Chatty <chatty@enac.fr>
   5  *  Copyright (c) 2010-2011 Benjamin Tissoires <benjamin.tissoires@gmail.com>
   6  *  Copyright (c) 2010-2011 Ecole Nationale de l'Aviation Civile, France
   7  *
   8  *  This code is partly based on hid-egalax.c:
   9  *
  10  *  Copyright (c) 2010 Stephane Chatty <chatty@enac.fr>
  11  *  Copyright (c) 2010 Henrik Rydberg <rydberg@euromail.se>
  12  *  Copyright (c) 2010 Canonical, Ltd.
  13  *
  14  */
  15
  16 /*
  17  * This program is free software; you can redistribute it and/or modify it
  18  * under the terms of the GNU General Public License as published by the Free
  19  * Software Foundation; either version 2 of the License, or (at your option)
  20  * any later version.
  21  */
  22
  23 #include <linux/device.h>
  24 #include <linux/hid.h>
  25 #include <linux/module.h>
  26 #include <linux/slab.h>
  27 #include <linux/usb.h>
  28 #include <linux/input/mt.h>
  29 #include "usbhid/usbhid.h"
  30
  31
  32 MODULE_AUTHOR("Stephane Chatty <chatty@enac.fr>");
  33 MODULE_AUTHOR("Benjamin Tissoires <benjamin.tissoires@gmail.com>");
  34 MODULE_DESCRIPTION("HID multitouch panels");
  35 MODULE_LICENSE("GPL");
  36
  37 #include "hid-ids.h"
  38
  39 /* quirks to control the device */
  40 #define MT_QUIRK_NOT_SEEN_MEANS_UP      (1 << 0)
  41 #define MT_QUIRK_SLOT_IS_CONTACTID      (1 << 1)
  42 #define MT_QUIRK_CYPRESS                (1 << 2)
  43 #define MT_QUIRK_SLOT_IS_CONTACTNUMBER  (1 << 3)
  44 #define MT_QUIRK_VALID_IS_INRANGE       (1 << 4)
  45 #define MT_QUIRK_VALID_IS_CONFIDENCE    (1 << 5)
  46 #define MT_QUIRK_EGALAX_XYZ_FIXUP       (1 << 6)
  47
  48 struct mt_slot {
  49         __s32 x, y, p, w, h;
  50         __s32 contactid;        /* the device ContactID assigned to this slot */
  51         bool touch_state;       /* is the touch valid? */
  52         bool seen_in_this_frame;/* has this slot been updated */
  53 };
  54
  55 struct mt_device {
  56         struct mt_slot curdata; /* placeholder of incoming data */
  57         struct mt_class *mtclass;       /* our mt device class */
  58         unsigned last_field_index;      /* last field index of the report */
  59         unsigned last_slot_field;       /* the last field of a slot */
  60         __s8 inputmode;         /* InputMode HID feature, -1 if non-existent */
  61         __u8 num_received;      /* how many contacts we received */
  62         __u8 num_expected;      /* expected last contact index */
  63         __u8 maxcontacts;
  64         bool curvalid;          /* is the current contact valid? */
  65         struct mt_slot *slots;
  66 };
  67
  68 struct mt_class {
  69         __s32 name;     /* MT_CLS */
  70         __s32 quirks;
  71         __s32 sn_move;  /* Signal/noise ratio for move events */
  72         __s32 sn_pressure;      /* Signal/noise ratio for pressure events */
  73         __u8 maxcontacts;
  74 };
  75
  76 /* classes of device behavior */
  77 #define MT_CLS_DEFAULT                          1
  78 #define MT_CLS_DUAL_INRANGE_CONTACTID           2
  79 #define MT_CLS_DUAL_INRANGE_CONTACTNUMBER       3
  80 #define MT_CLS_CYPRESS                          4
  81 #define MT_CLS_EGALAX                           5
  82 #define MT_CLS_STANTUM                          6
  83
  84 #define MT_DEFAULT_MAXCONTACT   10
  85
  86 /*
  87  * these device-dependent functions determine what slot corresponds
  88  * to a valid contact that was just read.
  89  */
  90
  91 static int cypress_compute_slot(struct mt_device *td)
  92 {
  93         if (td->curdata.contactid != 0 || td->num_received == 0)
  94                 return td->curdata.contactid;
  95         else
  96                 return -1;
  97 }
  98
  99 static int find_slot_from_contactid(struct mt_device *td)
 100 {
 101         int i;
 102         for (i = 0; i < td->maxcontacts; ++i) {
 103                 if (td->slots[i].contactid == td->curdata.contactid &&
 104                         td->slots[i].touch_state)
 105                         return i;
 106         }
 107         for (i = 0; i < td->maxcontacts; ++i) {
 108                 if (!td->slots[i].seen_in_this_frame &&
 109                         !td->slots[i].touch_state)
 110                         return i;
 111         }
 112         /* should not occurs. If this happens that means
 113          * that the device sent more touches that it says
 114          * in the report descriptor. It is ignored then. */
 115         return -1;
 116 }
 117
 118 struct mt_class mt_classes[] = {
 119         { .name = MT_CLS_DEFAULT,
 120                 .quirks = MT_QUIRK_NOT_SEEN_MEANS_UP },
 121         { .name = MT_CLS_DUAL_INRANGE_CONTACTID,
 122                 .quirks = MT_QUIRK_VALID_IS_INRANGE |
 123                         MT_QUIRK_SLOT_IS_CONTACTID,
 124                 .maxcontacts = 2 },
 125         { .name = MT_CLS_DUAL_INRANGE_CONTACTNUMBER,
 126                 .quirks = MT_QUIRK_VALID_IS_INRANGE |
 127                         MT_QUIRK_SLOT_IS_CONTACTNUMBER,
 128                 .maxcontacts = 2 },
 129         { .name = MT_CLS_CYPRESS,
 130                 .quirks = MT_QUIRK_NOT_SEEN_MEANS_UP |
 131                         MT_QUIRK_CYPRESS,
 132                 .maxcontacts = 10 },
 133
 134         { .name = MT_CLS_EGALAX,
 135                 .quirks =  MT_QUIRK_SLOT_IS_CONTACTID |
 136                         MT_QUIRK_VALID_IS_INRANGE |
 137                         MT_QUIRK_EGALAX_XYZ_FIXUP,
 138                 .maxcontacts = 2,
 139                 .sn_move = 4096,
 140                 .sn_pressure = 32,
 141         },
 142         { .name = MT_CLS_STANTUM,
 143                 .quirks = MT_QUIRK_VALID_IS_CONFIDENCE },
 144
 145         { }
 146 };
 147
 148 static void mt_feature_mapping(struct hid_device *hdev,
 149                 struct hid_field *field, struct hid_usage *usage)
 150 {
 151         struct mt_device *td = hid_get_drvdata(hdev);
 152
 153         switch (usage->hid) {
 154         case HID_DG_INPUTMODE:
 155                 td->inputmode = field->report->id;
 156                 break;
 157         case HID_DG_CONTACTMAX:
 158                 td->maxcontacts = field->value[0];
 159                 if (td->mtclass->maxcontacts)
 160                         /* check if the maxcontacts is given by the class */
 161                         td->maxcontacts = td->mtclass->maxcontacts;
 162
 163                 break;
 164         }
 165 }
 166
 167 static void set_abs(struct input_dev *input, unsigned int code,
 168                 struct hid_field *field, int snratio)
 169 {
 170         int fmin = field->logical_minimum;
 171         int fmax = field->logical_maximum;
 172         int fuzz = snratio ? (fmax - fmin) / snratio : 0;
 173         input_set_abs_params(input, code, fmin, fmax, fuzz, 0);
 174 }
 175
 176 static int mt_input_mapping(struct hid_device *hdev, struct hid_input *hi,
 177                 struct hid_field *field, struct hid_usage *usage,
 178                 unsigned long **bit, int *max)
 179 {
 180         struct mt_device *td = hid_get_drvdata(hdev);
 181         struct mt_class *cls = td->mtclass;
 182         __s32 quirks = cls->quirks;
 183
 184         switch (usage->hid & HID_USAGE_PAGE) {
 185
 186         case HID_UP_GENDESK:
 187                 switch (usage->hid) {
 188                 case HID_GD_X:
 189                         if (quirks & MT_QUIRK_EGALAX_XYZ_FIXUP)
 190                                 field->logical_maximum = 32760;
 191                         hid_map_usage(hi, usage, bit, max,
 192                                         EV_ABS, ABS_MT_POSITION_X);
 193                         set_abs(hi->input, ABS_MT_POSITION_X, field,
 194                                 cls->sn_move);
 195                         /* touchscreen emulation */
 196                         set_abs(hi->input, ABS_X, field, cls->sn_move);
 197                         td->last_slot_field = usage->hid;
 198                         return 1;
 199                 case HID_GD_Y:
 200                         if (quirks & MT_QUIRK_EGALAX_XYZ_FIXUP)
 201                                 field->logical_maximum = 32760;
 202                         hid_map_usage(hi, usage, bit, max,
 203                                         EV_ABS, ABS_MT_POSITION_Y);
 204                         set_abs(hi->input, ABS_MT_POSITION_Y, field,
 205                                 cls->sn_move);
 206                         /* touchscreen emulation */
 207                         set_abs(hi->input, ABS_Y, field, cls->sn_move);
 208                         td->last_slot_field = usage->hid;
 209                         return 1;
 210                 }
 211                 return 0;
 212
 213         case HID_UP_DIGITIZER:
 214                 switch (usage->hid) {
 215                 case HID_DG_INRANGE:
 216                         td->last_slot_field = usage->hid;
 217                         return 1;
 218                 case HID_DG_CONFIDENCE:
 219                         td->last_slot_field = usage->hid;
 220                         return 1;
 221                 case HID_DG_TIPSWITCH:
 222                         hid_map_usage(hi, usage, bit, max, EV_KEY, BTN_TOUCH);
 223                         input_set_capability(hi->input, EV_KEY, BTN_TOUCH);
 224                         td->last_slot_field = usage->hid;
 225                         return 1;
 226                 case HID_DG_CONTACTID:
 227                         input_mt_init_slots(hi->input, td->maxcontacts);
 228                         td->last_slot_field = usage->hid;
 229                         return 1;
 230                 case HID_DG_WIDTH:
 231                         hid_map_usage(hi, usage, bit, max,
 232                                         EV_ABS, ABS_MT_TOUCH_MAJOR);
 233                         td->last_slot_field = usage->hid;
 234                         return 1;
 235                 case HID_DG_HEIGHT:
 236                         hid_map_usage(hi, usage, bit, max,
 237                                         EV_ABS, ABS_MT_TOUCH_MINOR);
 238                         input_set_abs_params(hi->input,
 239                                         ABS_MT_ORIENTATION, 0, 1, 0, 0);
 240                         td->last_slot_field = usage->hid;
 241                         return 1;
 242                 case HID_DG_TIPPRESSURE:
 243                         if (quirks & MT_QUIRK_EGALAX_XYZ_FIXUP)
 244                                 field->logical_minimum = 0;
 245                         hid_map_usage(hi, usage, bit, max,
 246                                         EV_ABS, ABS_MT_PRESSURE);
 247                         set_abs(hi->input, ABS_MT_PRESSURE, field,
 248                                 cls->sn_pressure);
 249                         /* touchscreen emulation */
 250                         set_abs(hi->input, ABS_PRESSURE, field,
 251                                 cls->sn_pressure);
 252                         td->last_slot_field = usage->hid;
 253                         return 1;
 254                 case HID_DG_CONTACTCOUNT:
 255                         td->last_field_index = field->report->maxfield - 1;
 256                         return 1;
 257                 case HID_DG_CONTACTMAX:
 258                         /* we don't set td->last_slot_field as contactcount and
 259                          * contact max are global to the report */
 260                         return -1;
 261                 }
 262                 /* let hid-input decide for the others */
 263                 return 0;
 264
 265         case 0xff000000:
 266                 /* we do not want to map these: no input-oriented meaning */
 267                 return -1;
 268         }
 269
 270         return 0;
 271 }
 272
 273 static int mt_input_mapped(struct hid_device *hdev, struct hid_input *hi,
 274                 struct hid_field *field, struct hid_usage *usage,
 275                 unsigned long **bit, int *max)
 276 {
 277         if (usage->type == EV_KEY || usage->type == EV_ABS)
 278                 set_bit(usage->type, hi->input->evbit);
 279
 280         return -1;
 281 }
 282
 283 static int mt_compute_slot(struct mt_device *td)
 284 {
 285         __s32 quirks = td->mtclass->quirks;
 286
 287         if (quirks & MT_QUIRK_SLOT_IS_CONTACTID)
 288                 return td->curdata.contactid;
 289
 290         if (quirks & MT_QUIRK_CYPRESS)
 291                 return cypress_compute_slot(td);
 292
 293         if (quirks & MT_QUIRK_SLOT_IS_CONTACTNUMBER)
 294                 return td->num_received;
 295
 296         return find_slot_from_contactid(td);
 297 }
 298
 299 /*
 300  * this function is called when a whole contact has been processed,
 301  * so that it can assign it to a slot and store the data there
 302  */
 303 static void mt_complete_slot(struct mt_device *td)
 304 {
 305         td->curdata.seen_in_this_frame = true;
 306         if (td->curvalid) {
 307                 int slotnum = mt_compute_slot(td);
 308
 309                 if (slotnum >= 0 && slotnum < td->maxcontacts)
 310                         td->slots[slotnum] = td->curdata;
 311         }
 312         td->num_received++;
 313 }
 314
 315
 316 /*
 317  * this function is called when a whole packet has been received and processed,
 318  * so that it can decide what to send to the input layer.
 319  */
 320 static void mt_emit_event(struct mt_device *td, struct input_dev *input)
 321 {
 322         int i;
 323
 324         for (i = 0; i < td->maxcontacts; ++i) {
 325                 struct mt_slot *s = &(td->slots[i]);
 326                 if ((td->mtclass->quirks & MT_QUIRK_NOT_SEEN_MEANS_UP) &&
 327                         !s->seen_in_this_frame) {
 328                         s->touch_state = false;
 329                 }
 330
 331                 input_mt_slot(input, i);
 332                 input_mt_report_slot_state(input, MT_TOOL_FINGER,
 333                         s->touch_state);
 334                 if (s->touch_state) {
 335                         input_event(input, EV_ABS, ABS_MT_POSITION_X, s->x);
 336                         input_event(input, EV_ABS, ABS_MT_POSITION_Y, s->y);
 337                         input_event(input, EV_ABS, ABS_MT_PRESSURE, s->p);
 338                         input_event(input, EV_ABS, ABS_MT_TOUCH_MAJOR, s->w);
 339                         input_event(input, EV_ABS, ABS_MT_TOUCH_MINOR, s->h);
 340                 }
 341                 s->seen_in_this_frame = false;
 342
 343         }
 344
 345         input_mt_report_pointer_emulation(input, true);
 346         input_sync(input);
 347         td->num_received = 0;
 348 }
 349
 350
 351
 352 static int mt_event(struct hid_device *hid, struct hid_field *field,
 353                                 struct hid_usage *usage, __s32 value)
 354 {
 355         struct mt_device *td = hid_get_drvdata(hid);
 356         __s32 quirks = td->mtclass->quirks;
 357
 358         if (hid->claimed & HID_CLAIMED_INPUT && td->slots) {
 359                 switch (usage->hid) {
 360                 case HID_DG_INRANGE:
 361                         if (quirks & MT_QUIRK_VALID_IS_INRANGE)
 362                                 td->curvalid = value;
 363                         break;
 364                 case HID_DG_TIPSWITCH:
 365                         if (quirks & MT_QUIRK_NOT_SEEN_MEANS_UP)
 366                                 td->curvalid = value;
 367                         td->curdata.touch_state = value;
 368                         break;
 369                 case HID_DG_CONFIDENCE:
 370                         if (quirks & MT_QUIRK_VALID_IS_CONFIDENCE)
 371                                 td->curvalid = value;
 372                         break;
 373                 case HID_DG_CONTACTID:
 374                         td->curdata.contactid = value;
 375                         break;
 376                 case HID_DG_TIPPRESSURE:
 377                         td->curdata.p = value;
 378                         break;
 379                 case HID_GD_X:
 380                         td->curdata.x = value;
 381                         break;
 382                 case HID_GD_Y:
 383                         td->curdata.y = value;
 384                         break;
 385                 case HID_DG_WIDTH:
 386                         td->curdata.w = value;
 387                         break;
 388                 case HID_DG_HEIGHT:
 389                         td->curdata.h = value;
 390                         break;
 391                 case HID_DG_CONTACTCOUNT:
 392                         /*
 393                          * Includes multi-packet support where subsequent
 394                          * packets are sent with zero contactcount.
 395                          */
 396                         if (value)
 397                                 td->num_expected = value;
 398                         break;
 399
 400                 default:
 401                         /* fallback to the generic hidinput handling */
 402                         return 0;
 403                 }
 404
 405                 if (usage->hid == td->last_slot_field) {
 406                         mt_complete_slot(td);
 407                         if (!td->last_field_index)
 408                                 mt_emit_event(td, field->hidinput->input);
 409                 }
 410
 411                 if (field->index == td->last_field_index
 412                         && td->num_received >= td->num_expected)
 413                         mt_emit_event(td, field->hidinput->input);
 414
 415         }
 416
 417         /* we have handled the hidinput part, now remains hiddev */
 418         if (hid->claimed & HID_CLAIMED_HIDDEV && hid->hiddev_hid_event)
 419                 hid->hiddev_hid_event(hid, field, usage, value);
 420
 421         return 1;
 422 }
 423
 424 static void mt_set_input_mode(struct hid_device *hdev)
 425 {
 426         struct mt_device *td = hid_get_drvdata(hdev);
 427         struct hid_report *r;
 428         struct hid_report_enum *re;
 429
 430         if (td->inputmode < 0)
 431                 return;
 432
 433         re = &(hdev->report_enum[HID_FEATURE_REPORT]);
 434         r = re->report_id_hash[td->inputmode];
 435         if (r) {
 436                 r->field[0]->value[0] = 0x02;
 437                 usbhid_submit_report(hdev, r, USB_DIR_OUT);
 438         }
 439 }
 440
 441 static int mt_probe(struct hid_device *hdev, const struct hid_device_id *id)
 442 {
 443         int ret, i;
 444         struct mt_device *td;
 445         struct mt_class *mtclass = mt_classes; /* MT_CLS_DEFAULT */
 446
 447         for (i = 0; mt_classes[i].name ; i++) {
 448                 if (id->driver_data == mt_classes[i].name) {
 449                         mtclass = &(mt_classes[i]);
 450                         break;
 451                 }
 452         }
 453
 454         /* This allows the driver to correctly support devices
 455          * that emit events over several HID messages.
 456          */
 457         hdev->quirks |= HID_QUIRK_NO_INPUT_SYNC;
 458
 459         td = kzalloc(sizeof(struct mt_device), GFP_KERNEL);
 460         if (!td) {
 461                 dev_err(&hdev->dev, "cannot allocate multitouch data\n");
 462                 return -ENOMEM;
 463         }
 464         td->mtclass = mtclass;
 465         td->inputmode = -1;
 466         hid_set_drvdata(hdev, td);
 467
 468         ret = hid_parse(hdev);
 469         if (ret != 0)
 470                 goto fail;
 471
 472         ret = hid_hw_start(hdev, HID_CONNECT_DEFAULT);
 473         if (ret)
 474                 goto fail;
 475
 476         if (!td->maxcontacts)
 477                 td->maxcontacts = MT_DEFAULT_MAXCONTACT;
 478
 479         td->slots = kzalloc(td->maxcontacts * sizeof(struct mt_slot),
 480                                 GFP_KERNEL);
 481         if (!td->slots) {
 482                 dev_err(&hdev->dev, "cannot allocate multitouch slots\n");
 483                 hid_hw_stop(hdev);
 484                 ret = -ENOMEM;
 485                 goto fail;
 486         }
 487
 488         mt_set_input_mode(hdev);
 489
 490         return 0;
 491
 492 fail:
 493         kfree(td);
 494         return ret;
 495 }
 496
 497 #ifdef CONFIG_PM
 498 static int mt_reset_resume(struct hid_device *hdev)
 499 {
 500         mt_set_input_mode(hdev);
 501         return 0;
 502 }
 503 #endif
 504
 505 static void mt_remove(struct hid_device *hdev)
 506 {
 507         struct mt_device *td = hid_get_drvdata(hdev);
 508         hid_hw_stop(hdev);
 509         kfree(td->slots);
 510         kfree(td);
 511         hid_set_drvdata(hdev, NULL);
 512 }
 513
 514 static const struct hid_device_id mt_devices[] = {
 515
 516         /* Cando panels */
 517         { .driver_data = MT_CLS_DUAL_INRANGE_CONTACTNUMBER,
 518                 HID_USB_DEVICE(USB_VENDOR_ID_CANDO,
 519                         USB_DEVICE_ID_CANDO_MULTI_TOUCH) },
 520         { .driver_data = MT_CLS_DUAL_INRANGE_CONTACTNUMBER,
 521                 HID_USB_DEVICE(USB_VENDOR_ID_CANDO,
 522                         USB_DEVICE_ID_CANDO_MULTI_TOUCH_10_1) },
 523         { .driver_data = MT_CLS_DUAL_INRANGE_CONTACTNUMBER,
 524                 HID_USB_DEVICE(USB_VENDOR_ID_CANDO,
 525                         USB_DEVICE_ID_CANDO_MULTI_TOUCH_11_6) },
 526         { .driver_data = MT_CLS_DUAL_INRANGE_CONTACTNUMBER,
 527                 HID_USB_DEVICE(USB_VENDOR_ID_CANDO,
 528                         USB_DEVICE_ID_CANDO_MULTI_TOUCH_15_6) },
 529
 530         /* Cypress panel */
 531         { .driver_data = MT_CLS_CYPRESS,
 532                 HID_USB_DEVICE(USB_VENDOR_ID_CYPRESS,
 533                         USB_DEVICE_ID_CYPRESS_TRUETOUCH) },
 534
 535         /* GeneralTouch panel */
 536         { .driver_data = MT_CLS_DUAL_INRANGE_CONTACTNUMBER,
 537                 HID_USB_DEVICE(USB_VENDOR_ID_GENERAL_TOUCH,
 538                         USB_DEVICE_ID_GENERAL_TOUCH_WIN7_TWOFINGERS) },
 539
 540         /* IRTOUCH panels */
 541         { .driver_data = MT_CLS_DUAL_INRANGE_CONTACTID,
 542                 HID_USB_DEVICE(USB_VENDOR_ID_IRTOUCHSYSTEMS,
 543                         USB_DEVICE_ID_IRTOUCH_INFRARED_USB) },
 544
 545         /* PixCir-based panels */
 546         { .driver_data = MT_CLS_DUAL_INRANGE_CONTACTID,
 547                 HID_USB_DEVICE(USB_VENDOR_ID_HANVON,
 548                         USB_DEVICE_ID_HANVON_MULTITOUCH) },
 549         { .driver_data = MT_CLS_DUAL_INRANGE_CONTACTID,
 550                 HID_USB_DEVICE(USB_VENDOR_ID_CANDO,
 551                         USB_DEVICE_ID_CANDO_PIXCIR_MULTI_TOUCH) },
 552
 553         /* Resistive eGalax devices */
 554         {  .driver_data = MT_CLS_EGALAX,
 555                 HID_USB_DEVICE(USB_VENDOR_ID_DWAV,
 556                         USB_DEVICE_ID_DWAV_EGALAX_MULTITOUCH) },
 557         {  .driver_data = MT_CLS_EGALAX,
 558                 HID_USB_DEVICE(USB_VENDOR_ID_DWAV,
 559                         USB_DEVICE_ID_DWAV_EGALAX_MULTITOUCH3) },
 560
 561         /* Capacitive eGalax devices */
 562         {  .driver_data = MT_CLS_EGALAX,
 563                 HID_USB_DEVICE(USB_VENDOR_ID_DWAV,
 564                         USB_DEVICE_ID_DWAV_EGALAX_MULTITOUCH1) },
 565         {  .driver_data = MT_CLS_EGALAX,
 566                 HID_USB_DEVICE(USB_VENDOR_ID_DWAV,
 567                         USB_DEVICE_ID_DWAV_EGALAX_MULTITOUCH2) },
 568         {  .driver_data = MT_CLS_EGALAX,
 569                 HID_USB_DEVICE(USB_VENDOR_ID_DWAV,
 570                         USB_DEVICE_ID_DWAV_EGALAX_MULTITOUCH4) },
 571
 572         /* Stantum panels */
 573         { .driver_data = MT_CLS_STANTUM,
 574                 HID_USB_DEVICE(USB_VENDOR_ID_STANTUM,
 575                         USB_DEVICE_ID_MTP)},
 576         { .driver_data = MT_CLS_STANTUM,
 577                 HID_USB_DEVICE(USB_VENDOR_ID_STANTUM,
 578                         USB_DEVICE_ID_MTP_STM)},
 579         { .driver_data = MT_CLS_STANTUM,
 580                 HID_USB_DEVICE(USB_VENDOR_ID_STANTUM,
 581                         USB_DEVICE_ID_MTP_SITRONIX)},
 582
 583         { }
 584 };
 585 MODULE_DEVICE_TABLE(hid, mt_devices);
 586
 587 static const struct hid_usage_id mt_grabbed_usages[] = {
 588         { HID_ANY_ID, HID_ANY_ID, HID_ANY_ID },
 589         { HID_ANY_ID - 1, HID_ANY_ID - 1, HID_ANY_ID - 1}
 590 };
 591
 592 static struct hid_driver mt_driver = {
 593         .name = "hid-multitouch",
 594         .id_table = mt_devices,
 595         .probe = mt_probe,
 596         .remove = mt_remove,
 597         .input_mapping = mt_input_mapping,
 598         .input_mapped = mt_input_mapped,
 599         .feature_mapping = mt_feature_mapping,
 600         .usage_table = mt_grabbed_usages,
 601         .event = mt_event,
 602 #ifdef CONFIG_PM
 603         .reset_resume = mt_reset_resume,
 604 #endif
 605 };
 606
 607 static int __init mt_init(void)
 608 {
 609         return hid_register_driver(&mt_driver);
 610 }
 611
 612 static void __exit mt_exit(void)
 613 {
 614         hid_unregister_driver(&mt_driver);
 615 }
 616
 617 module_init(mt_init);
 618 module_exit(mt_exit);