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                         field->logical_maximum = 1;
 239                         field->logical_minimum = 0;
 240                         set_abs(hi->input, ABS_MT_ORIENTATION, field, 0);
 241                         td->last_slot_field = usage->hid;
 242                         return 1;
 243                 case HID_DG_TIPPRESSURE:
 244                         if (quirks & MT_QUIRK_EGALAX_XYZ_FIXUP)
 245                                 field->logical_minimum = 0;
 246                         hid_map_usage(hi, usage, bit, max,
 247                                         EV_ABS, ABS_MT_PRESSURE);
 248                         set_abs(hi->input, ABS_MT_PRESSURE, field,
 249                                 cls->sn_pressure);
 250                         /* touchscreen emulation */
 251                         set_abs(hi->input, ABS_PRESSURE, field,
 252                                 cls->sn_pressure);
 253                         td->last_slot_field = usage->hid;
 254                         return 1;
 255                 case HID_DG_CONTACTCOUNT:
 256                         td->last_field_index = field->report->maxfield - 1;
 257                         return 1;
 258                 case HID_DG_CONTACTMAX:
 259                         /* we don't set td->last_slot_field as contactcount and
 260                          * contact max are global to the report */
 261                         return -1;
 262                 }
 263                 /* let hid-input decide for the others */
 264                 return 0;
 265
 266         case 0xff000000:
 267                 /* we do not want to map these: no input-oriented meaning */
 268                 return -1;
 269         }
 270
 271         return 0;
 272 }
 273
 274 static int mt_input_mapped(struct hid_device *hdev, struct hid_input *hi,
 275                 struct hid_field *field, struct hid_usage *usage,
 276                 unsigned long **bit, int *max)
 277 {
 278         if (usage->type == EV_KEY || usage->type == EV_ABS)
 279                 set_bit(usage->type, hi->input->evbit);
 280
 281         return -1;
 282 }
 283
 284 static int mt_compute_slot(struct mt_device *td)
 285 {
 286         __s32 quirks = td->mtclass->quirks;
 287
 288         if (quirks & MT_QUIRK_SLOT_IS_CONTACTID)
 289                 return td->curdata.contactid;
 290
 291         if (quirks & MT_QUIRK_CYPRESS)
 292                 return cypress_compute_slot(td);
 293
 294         if (quirks & MT_QUIRK_SLOT_IS_CONTACTNUMBER)
 295                 return td->num_received;
 296
 297         return find_slot_from_contactid(td);
 298 }
 299
 300 /*
 301  * this function is called when a whole contact has been processed,
 302  * so that it can assign it to a slot and store the data there
 303  */
 304 static void mt_complete_slot(struct mt_device *td)
 305 {
 306         td->curdata.seen_in_this_frame = true;
 307         if (td->curvalid) {
 308                 int slotnum = mt_compute_slot(td);
 309
 310                 if (slotnum >= 0 && slotnum < td->maxcontacts)
 311                         td->slots[slotnum] = td->curdata;
 312         }
 313         td->num_received++;
 314 }
 315
 316
 317 /*
 318  * this function is called when a whole packet has been received and processed,
 319  * so that it can decide what to send to the input layer.
 320  */
 321 static void mt_emit_event(struct mt_device *td, struct input_dev *input)
 322 {
 323         int i;
 324
 325         for (i = 0; i < td->maxcontacts; ++i) {
 326                 struct mt_slot *s = &(td->slots[i]);
 327                 if ((td->mtclass->quirks & MT_QUIRK_NOT_SEEN_MEANS_UP) &&
 328                         !s->seen_in_this_frame) {
 329                         s->touch_state = false;
 330                 }
 331
 332                 input_mt_slot(input, i);
 333                 input_mt_report_slot_state(input, MT_TOOL_FINGER,
 334                         s->touch_state);
 335                 if (s->touch_state) {
 336                         input_event(input, EV_ABS, ABS_MT_POSITION_X, s->x);
 337                         input_event(input, EV_ABS, ABS_MT_POSITION_Y, s->y);
 338                         input_event(input, EV_ABS, ABS_MT_PRESSURE, s->p);
 339                         input_event(input, EV_ABS, ABS_MT_TOUCH_MAJOR, s->w);
 340                         input_event(input, EV_ABS, ABS_MT_TOUCH_MINOR, s->h);
 341                 }
 342                 s->seen_in_this_frame = false;
 343
 344         }
 345
 346         input_mt_report_pointer_emulation(input, true);
 347         input_sync(input);
 348         td->num_received = 0;
 349 }
 350
 351
 352
 353 static int mt_event(struct hid_device *hid, struct hid_field *field,
 354                                 struct hid_usage *usage, __s32 value)
 355 {
 356         struct mt_device *td = hid_get_drvdata(hid);
 357         __s32 quirks = td->mtclass->quirks;
 358
 359         if (hid->claimed & HID_CLAIMED_INPUT && td->slots) {
 360                 switch (usage->hid) {
 361                 case HID_DG_INRANGE:
 362                         if (quirks & MT_QUIRK_VALID_IS_INRANGE)
 363                                 td->curvalid = value;
 364                         break;
 365                 case HID_DG_TIPSWITCH:
 366                         if (quirks & MT_QUIRK_NOT_SEEN_MEANS_UP)
 367                                 td->curvalid = value;
 368                         td->curdata.touch_state = value;
 369                         break;
 370                 case HID_DG_CONFIDENCE:
 371                         if (quirks & MT_QUIRK_VALID_IS_CONFIDENCE)
 372                                 td->curvalid = value;
 373                         break;
 374                 case HID_DG_CONTACTID:
 375                         td->curdata.contactid = value;
 376                         break;
 377                 case HID_DG_TIPPRESSURE:
 378                         td->curdata.p = value;
 379                         break;
 380                 case HID_GD_X:
 381                         td->curdata.x = value;
 382                         break;
 383                 case HID_GD_Y:
 384                         td->curdata.y = value;
 385                         break;
 386                 case HID_DG_WIDTH:
 387                         td->curdata.w = value;
 388                         break;
 389                 case HID_DG_HEIGHT:
 390                         td->curdata.h = value;
 391                         break;
 392                 case HID_DG_CONTACTCOUNT:
 393                         /*
 394                          * Includes multi-packet support where subsequent
 395                          * packets are sent with zero contactcount.
 396                          */
 397                         if (value)
 398                                 td->num_expected = value;
 399                         break;
 400
 401                 default:
 402                         /* fallback to the generic hidinput handling */
 403                         return 0;
 404                 }
 405
 406                 if (usage->hid == td->last_slot_field) {
 407                         mt_complete_slot(td);
 408                         if (!td->last_field_index)
 409                                 mt_emit_event(td, field->hidinput->input);
 410                 }
 411
 412                 if (field->index == td->last_field_index
 413                         && td->num_received >= td->num_expected)
 414                         mt_emit_event(td, field->hidinput->input);
 415
 416         }
 417
 418         /* we have handled the hidinput part, now remains hiddev */
 419         if (hid->claimed & HID_CLAIMED_HIDDEV && hid->hiddev_hid_event)
 420                 hid->hiddev_hid_event(hid, field, usage, value);
 421
 422         return 1;
 423 }
 424
 425 static void mt_set_input_mode(struct hid_device *hdev)
 426 {
 427         struct mt_device *td = hid_get_drvdata(hdev);
 428         struct hid_report *r;
 429         struct hid_report_enum *re;
 430
 431         if (td->inputmode < 0)
 432                 return;
 433
 434         re = &(hdev->report_enum[HID_FEATURE_REPORT]);
 435         r = re->report_id_hash[td->inputmode];
 436         if (r) {
 437                 r->field[0]->value[0] = 0x02;
 438                 usbhid_submit_report(hdev, r, USB_DIR_OUT);
 439         }
 440 }
 441
 442 static int mt_probe(struct hid_device *hdev, const struct hid_device_id *id)
 443 {
 444         int ret, i;
 445         struct mt_device *td;
 446         struct mt_class *mtclass = mt_classes; /* MT_CLS_DEFAULT */
 447
 448         for (i = 0; mt_classes[i].name ; i++) {
 449                 if (id->driver_data == mt_classes[i].name) {
 450                         mtclass = &(mt_classes[i]);
 451                         break;
 452                 }
 453         }
 454
 455         /* This allows the driver to correctly support devices
 456          * that emit events over several HID messages.
 457          */
 458         hdev->quirks |= HID_QUIRK_NO_INPUT_SYNC;
 459
 460         td = kzalloc(sizeof(struct mt_device), GFP_KERNEL);
 461         if (!td) {
 462                 dev_err(&hdev->dev, "cannot allocate multitouch data\n");
 463                 return -ENOMEM;
 464         }
 465         td->mtclass = mtclass;
 466         td->inputmode = -1;
 467         hid_set_drvdata(hdev, td);
 468
 469         ret = hid_parse(hdev);
 470         if (ret != 0)
 471                 goto fail;
 472
 473         ret = hid_hw_start(hdev, HID_CONNECT_DEFAULT);
 474         if (ret)
 475                 goto fail;
 476
 477         if (!td->maxcontacts)
 478                 td->maxcontacts = MT_DEFAULT_MAXCONTACT;
 479
 480         td->slots = kzalloc(td->maxcontacts * sizeof(struct mt_slot),
 481                                 GFP_KERNEL);
 482         if (!td->slots) {
 483                 dev_err(&hdev->dev, "cannot allocate multitouch slots\n");
 484                 hid_hw_stop(hdev);
 485                 ret = -ENOMEM;
 486                 goto fail;
 487         }
 488
 489         mt_set_input_mode(hdev);
 490
 491         return 0;
 492
 493 fail:
 494         kfree(td);
 495         return ret;
 496 }
 497
 498 #ifdef CONFIG_PM
 499 static int mt_reset_resume(struct hid_device *hdev)
 500 {
 501         mt_set_input_mode(hdev);
 502         return 0;
 503 }
 504 #endif
 505
 506 static void mt_remove(struct hid_device *hdev)
 507 {
 508         struct mt_device *td = hid_get_drvdata(hdev);
 509         hid_hw_stop(hdev);
 510         kfree(td->slots);
 511         kfree(td);
 512         hid_set_drvdata(hdev, NULL);
 513 }
 514
 515 static const struct hid_device_id mt_devices[] = {
 516
 517         /* Cypress panel */
 518         { .driver_data = MT_CLS_CYPRESS,
 519                 HID_USB_DEVICE(USB_VENDOR_ID_CYPRESS,
 520                         USB_DEVICE_ID_CYPRESS_TRUETOUCH) },
 521
 522         /* GeneralTouch panel */
 523         { .driver_data = MT_CLS_DUAL_INRANGE_CONTACTNUMBER,
 524                 HID_USB_DEVICE(USB_VENDOR_ID_GENERAL_TOUCH,
 525                         USB_DEVICE_ID_GENERAL_TOUCH_WIN7_TWOFINGERS) },
 526
 527         /* IRTOUCH panels */
 528         { .driver_data = MT_CLS_DUAL_INRANGE_CONTACTID,
 529                 HID_USB_DEVICE(USB_VENDOR_ID_IRTOUCHSYSTEMS,
 530                         USB_DEVICE_ID_IRTOUCH_INFRARED_USB) },
 531
 532         /* PixCir-based panels */
 533         { .driver_data = MT_CLS_DUAL_INRANGE_CONTACTID,
 534                 HID_USB_DEVICE(USB_VENDOR_ID_HANVON,
 535                         USB_DEVICE_ID_HANVON_MULTITOUCH) },
 536         { .driver_data = MT_CLS_DUAL_INRANGE_CONTACTID,
 537                 HID_USB_DEVICE(USB_VENDOR_ID_CANDO,
 538                         USB_DEVICE_ID_CANDO_PIXCIR_MULTI_TOUCH) },
 539
 540         /* Resistive eGalax devices */
 541         {  .driver_data = MT_CLS_EGALAX,
 542                 HID_USB_DEVICE(USB_VENDOR_ID_DWAV,
 543                         USB_DEVICE_ID_DWAV_EGALAX_MULTITOUCH) },
 544         {  .driver_data = MT_CLS_EGALAX,
 545                 HID_USB_DEVICE(USB_VENDOR_ID_DWAV,
 546                         USB_DEVICE_ID_DWAV_EGALAX_MULTITOUCH3) },
 547
 548         /* Capacitive eGalax devices */
 549         {  .driver_data = MT_CLS_EGALAX,
 550                 HID_USB_DEVICE(USB_VENDOR_ID_DWAV,
 551                         USB_DEVICE_ID_DWAV_EGALAX_MULTITOUCH1) },
 552         {  .driver_data = MT_CLS_EGALAX,
 553                 HID_USB_DEVICE(USB_VENDOR_ID_DWAV,
 554                         USB_DEVICE_ID_DWAV_EGALAX_MULTITOUCH2) },
 555         {  .driver_data = MT_CLS_EGALAX,
 556                 HID_USB_DEVICE(USB_VENDOR_ID_DWAV,
 557                         USB_DEVICE_ID_DWAV_EGALAX_MULTITOUCH4) },
 558
 559         /* Stantum panels */
 560         { .driver_data = MT_CLS_STANTUM,
 561                 HID_USB_DEVICE(USB_VENDOR_ID_STANTUM,
 562                         USB_DEVICE_ID_MTP)},
 563         { .driver_data = MT_CLS_STANTUM,
 564                 HID_USB_DEVICE(USB_VENDOR_ID_STANTUM,
 565                         USB_DEVICE_ID_MTP_STM)},
 566         { .driver_data = MT_CLS_STANTUM,
 567                 HID_USB_DEVICE(USB_VENDOR_ID_STANTUM,
 568                         USB_DEVICE_ID_MTP_SITRONIX)},
 569
 570         { }
 571 };
 572 MODULE_DEVICE_TABLE(hid, mt_devices);
 573
 574 static const struct hid_usage_id mt_grabbed_usages[] = {
 575         { HID_ANY_ID, HID_ANY_ID, HID_ANY_ID },
 576         { HID_ANY_ID - 1, HID_ANY_ID - 1, HID_ANY_ID - 1}
 577 };
 578
 579 static struct hid_driver mt_driver = {
 580         .name = "hid-multitouch",
 581         .id_table = mt_devices,
 582         .probe = mt_probe,
 583         .remove = mt_remove,
 584         .input_mapping = mt_input_mapping,
 585         .input_mapped = mt_input_mapped,
 586         .feature_mapping = mt_feature_mapping,
 587         .usage_table = mt_grabbed_usages,
 588         .event = mt_event,
 589 #ifdef CONFIG_PM
 590         .reset_resume = mt_reset_resume,
 591 #endif
 592 };
 593
 594 static int __init mt_init(void)
 595 {
 596         return hid_register_driver(&mt_driver);
 597 }
 598
 599 static void __exit mt_exit(void)
 600 {
 601         hid_unregister_driver(&mt_driver);
 602 }
 603
 604 module_init(mt_init);
 605 module_exit(mt_exit);