drivers/hid/hid-multitouch.c

   1 /*
   2  *  HID driver for multitouch panels
   3  *
   4  *  Copyright (c) 2010-2012 Stephane Chatty <chatty@enac.fr>
   5  *  Copyright (c) 2010-2012 Benjamin Tissoires <benjamin.tissoires@gmail.com>
   6  *  Copyright (c) 2010-2012 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  *  This code is partly based on hid-3m-pct.c:
  15  *
  16  *  Copyright (c) 2009-2010 Stephane Chatty <chatty@enac.fr>
  17  *  Copyright (c) 2010      Henrik Rydberg <rydberg@euromail.se>
  18  *  Copyright (c) 2010      Canonical, Ltd.
  19  *
  20  */
  21
  22 /*
  23  * This program is free software; you can redistribute it and/or modify it
  24  * under the terms of the GNU General Public License as published by the Free
  25  * Software Foundation; either version 2 of the License, or (at your option)
  26  * any later version.
  27  */
  28
  29 #include <linux/device.h>
  30 #include <linux/hid.h>
  31 #include <linux/module.h>
  32 #include <linux/slab.h>
  33 #include <linux/usb.h>
  34 #include <linux/input/mt.h>
  35 #include "usbhid/usbhid.h"
  36
  37
  38 MODULE_AUTHOR("Stephane Chatty <chatty@enac.fr>");
  39 MODULE_AUTHOR("Benjamin Tissoires <benjamin.tissoires@gmail.com>");
  40 MODULE_DESCRIPTION("HID multitouch panels");
  41 MODULE_LICENSE("GPL");
  42
  43 #include "hid-ids.h"
  44
  45 /* quirks to control the device */
  46 #define MT_QUIRK_NOT_SEEN_MEANS_UP      (1 << 0)
  47 #define MT_QUIRK_SLOT_IS_CONTACTID      (1 << 1)
  48 #define MT_QUIRK_CYPRESS                (1 << 2)
  49 #define MT_QUIRK_SLOT_IS_CONTACTNUMBER  (1 << 3)
  50 #define MT_QUIRK_ALWAYS_VALID           (1 << 4)
  51 #define MT_QUIRK_VALID_IS_INRANGE       (1 << 5)
  52 #define MT_QUIRK_VALID_IS_CONFIDENCE    (1 << 6)
  53 #define MT_QUIRK_SLOT_IS_CONTACTID_MINUS_ONE    (1 << 8)
  54
  55 struct mt_slot {
  56         __s32 x, y, p, w, h;
  57         __s32 contactid;        /* the device ContactID assigned to this slot */
  58         bool touch_state;       /* is the touch valid? */
  59         bool seen_in_this_frame;/* has this slot been updated */
  60 };
  61
  62 struct mt_class {
  63         __s32 name;     /* MT_CLS */
  64         __s32 quirks;
  65         __s32 sn_move;  /* Signal/noise ratio for move events */
  66         __s32 sn_width; /* Signal/noise ratio for width events */
  67         __s32 sn_height;        /* Signal/noise ratio for height events */
  68         __s32 sn_pressure;      /* Signal/noise ratio for pressure events */
  69         __u8 maxcontacts;
  70         bool is_indirect;       /* true for touchpads */
  71 };
  72
  73 struct mt_device {
  74         struct mt_slot curdata; /* placeholder of incoming data */
  75         struct mt_class mtclass;        /* our mt device class */
  76         unsigned last_field_index;      /* last field index of the report */
  77         unsigned last_slot_field;       /* the last field of a slot */
  78         __s8 inputmode;         /* InputMode HID feature, -1 if non-existent */
  79         __s8 maxcontact_report_id;      /* Maximum Contact Number HID feature,
  80                                    -1 if non-existent */
  81         __u8 num_received;      /* how many contacts we received */
  82         __u8 num_expected;      /* expected last contact index */
  83         __u8 maxcontacts;
  84         __u8 touches_by_report; /* how many touches are present in one report:
  85                                 * 1 means we should use a serial protocol
  86                                 * > 1 means hybrid (multitouch) protocol */
  87         bool curvalid;          /* is the current contact valid? */
  88         struct mt_slot *slots;
  89 };
  90
  91 /* classes of device behavior */
  92 #define MT_CLS_DEFAULT                          0x0001
  93
  94 #define MT_CLS_SERIAL                           0x0002
  95 #define MT_CLS_CONFIDENCE                       0x0003
  96 #define MT_CLS_CONFIDENCE_CONTACT_ID            0x0004
  97 #define MT_CLS_CONFIDENCE_MINUS_ONE             0x0005
  98 #define MT_CLS_DUAL_INRANGE_CONTACTID           0x0006
  99 #define MT_CLS_DUAL_INRANGE_CONTACTNUMBER       0x0007
 100 #define MT_CLS_DUAL_NSMU_CONTACTID              0x0008
 101 #define MT_CLS_INRANGE_CONTACTNUMBER            0x0009
 102
 103 /* vendor specific classes */
 104 #define MT_CLS_3M                               0x0101
 105 #define MT_CLS_CYPRESS                          0x0102
 106 #define MT_CLS_EGALAX                           0x0103
 107 #define MT_CLS_EGALAX_SERIAL                    0x0104
 108 #define MT_CLS_TOPSEED                          0x0105
 109 #define MT_CLS_PANASONIC                        0x0106
 110
 111 #define MT_DEFAULT_MAXCONTACT   10
 112
 113 /*
 114  * these device-dependent functions determine what slot corresponds
 115  * to a valid contact that was just read.
 116  */
 117
 118 static int cypress_compute_slot(struct mt_device *td)
 119 {
 120         if (td->curdata.contactid != 0 || td->num_received == 0)
 121                 return td->curdata.contactid;
 122         else
 123                 return -1;
 124 }
 125
 126 static int find_slot_from_contactid(struct mt_device *td)
 127 {
 128         int i;
 129         for (i = 0; i < td->maxcontacts; ++i) {
 130                 if (td->slots[i].contactid == td->curdata.contactid &&
 131                         td->slots[i].touch_state)
 132                         return i;
 133         }
 134         for (i = 0; i < td->maxcontacts; ++i) {
 135                 if (!td->slots[i].seen_in_this_frame &&
 136                         !td->slots[i].touch_state)
 137                         return i;
 138         }
 139         /* should not occurs. If this happens that means
 140          * that the device sent more touches that it says
 141          * in the report descriptor. It is ignored then. */
 142         return -1;
 143 }
 144
 145 static struct mt_class mt_classes[] = {
 146         { .name = MT_CLS_DEFAULT,
 147                 .quirks = MT_QUIRK_NOT_SEEN_MEANS_UP },
 148         { .name = MT_CLS_SERIAL,
 149                 .quirks = MT_QUIRK_ALWAYS_VALID},
 150         { .name = MT_CLS_CONFIDENCE,
 151                 .quirks = MT_QUIRK_VALID_IS_CONFIDENCE },
 152         { .name = MT_CLS_CONFIDENCE_CONTACT_ID,
 153                 .quirks = MT_QUIRK_VALID_IS_CONFIDENCE |
 154                         MT_QUIRK_SLOT_IS_CONTACTID },
 155         { .name = MT_CLS_CONFIDENCE_MINUS_ONE,
 156                 .quirks = MT_QUIRK_VALID_IS_CONFIDENCE |
 157                         MT_QUIRK_SLOT_IS_CONTACTID_MINUS_ONE },
 158         { .name = MT_CLS_DUAL_INRANGE_CONTACTID,
 159                 .quirks = MT_QUIRK_VALID_IS_INRANGE |
 160                         MT_QUIRK_SLOT_IS_CONTACTID,
 161                 .maxcontacts = 2 },
 162         { .name = MT_CLS_DUAL_INRANGE_CONTACTNUMBER,
 163                 .quirks = MT_QUIRK_VALID_IS_INRANGE |
 164                         MT_QUIRK_SLOT_IS_CONTACTNUMBER,
 165                 .maxcontacts = 2 },
 166         { .name = MT_CLS_DUAL_NSMU_CONTACTID,
 167                 .quirks = MT_QUIRK_NOT_SEEN_MEANS_UP |
 168                         MT_QUIRK_SLOT_IS_CONTACTID,
 169                 .maxcontacts = 2 },
 170         { .name = MT_CLS_INRANGE_CONTACTNUMBER,
 171                 .quirks = MT_QUIRK_VALID_IS_INRANGE |
 172                         MT_QUIRK_SLOT_IS_CONTACTNUMBER },
 173
 174         /*
 175          * vendor specific classes
 176          */
 177         { .name = MT_CLS_3M,
 178                 .quirks = MT_QUIRK_VALID_IS_CONFIDENCE |
 179                         MT_QUIRK_SLOT_IS_CONTACTID,
 180                 .sn_move = 2048,
 181                 .sn_width = 128,
 182                 .sn_height = 128 },
 183         { .name = MT_CLS_CYPRESS,
 184                 .quirks = MT_QUIRK_NOT_SEEN_MEANS_UP |
 185                         MT_QUIRK_CYPRESS,
 186                 .maxcontacts = 10 },
 187         { .name = MT_CLS_EGALAX,
 188                 .quirks =  MT_QUIRK_SLOT_IS_CONTACTID |
 189                         MT_QUIRK_VALID_IS_INRANGE,
 190                 .sn_move = 4096,
 191                 .sn_pressure = 32,
 192         },
 193         { .name = MT_CLS_EGALAX_SERIAL,
 194                 .quirks =  MT_QUIRK_SLOT_IS_CONTACTID |
 195                         MT_QUIRK_ALWAYS_VALID,
 196                 .sn_move = 4096,
 197                 .sn_pressure = 32,
 198         },
 199         { .name = MT_CLS_TOPSEED,
 200                 .quirks = MT_QUIRK_ALWAYS_VALID,
 201                 .is_indirect = true,
 202                 .maxcontacts = 2,
 203         },
 204         { .name = MT_CLS_PANASONIC,
 205                 .quirks = MT_QUIRK_NOT_SEEN_MEANS_UP,
 206                 .maxcontacts = 4 },
 207
 208         { }
 209 };
 210
 211 static ssize_t mt_show_quirks(struct device *dev,
 212                            struct device_attribute *attr,
 213                            char *buf)
 214 {
 215         struct hid_device *hdev = container_of(dev, struct hid_device, dev);
 216         struct mt_device *td = hid_get_drvdata(hdev);
 217
 218         return sprintf(buf, "%u\n", td->mtclass.quirks);
 219 }
 220
 221 static ssize_t mt_set_quirks(struct device *dev,
 222                           struct device_attribute *attr,
 223                           const char *buf, size_t count)
 224 {
 225         struct hid_device *hdev = container_of(dev, struct hid_device, dev);
 226         struct mt_device *td = hid_get_drvdata(hdev);
 227
 228         unsigned long val;
 229
 230         if (kstrtoul(buf, 0, &val))
 231                 return -EINVAL;
 232
 233         td->mtclass.quirks = val;
 234
 235         return count;
 236 }
 237
 238 static DEVICE_ATTR(quirks, S_IWUSR | S_IRUGO, mt_show_quirks, mt_set_quirks);
 239
 240 static struct attribute *sysfs_attrs[] = {
 241         &dev_attr_quirks.attr,
 242         NULL
 243 };
 244
 245 static struct attribute_group mt_attribute_group = {
 246         .attrs = sysfs_attrs
 247 };
 248
 249 static void mt_feature_mapping(struct hid_device *hdev,
 250                 struct hid_field *field, struct hid_usage *usage)
 251 {
 252         struct mt_device *td = hid_get_drvdata(hdev);
 253
 254         switch (usage->hid) {
 255         case HID_DG_INPUTMODE:
 256                 td->inputmode = field->report->id;
 257                 break;
 258         case HID_DG_CONTACTMAX:
 259                 td->maxcontact_report_id = field->report->id;
 260                 td->maxcontacts = field->value[0];
 261                 if (td->mtclass.maxcontacts)
 262                         /* check if the maxcontacts is given by the class */
 263                         td->maxcontacts = td->mtclass.maxcontacts;
 264
 265                 break;
 266         }
 267 }
 268
 269 static void set_abs(struct input_dev *input, unsigned int code,
 270                 struct hid_field *field, int snratio)
 271 {
 272         int fmin = field->logical_minimum;
 273         int fmax = field->logical_maximum;
 274         int fuzz = snratio ? (fmax - fmin) / snratio : 0;
 275         input_set_abs_params(input, code, fmin, fmax, fuzz, 0);
 276 }
 277
 278 static void set_last_slot_field(struct hid_usage *usage, struct mt_device *td,
 279                 struct hid_input *hi)
 280 {
 281         if (!test_bit(usage->hid, hi->input->absbit))
 282                 td->last_slot_field = usage->hid;
 283 }
 284
 285 static int mt_input_mapping(struct hid_device *hdev, struct hid_input *hi,
 286                 struct hid_field *field, struct hid_usage *usage,
 287                 unsigned long **bit, int *max)
 288 {
 289         struct mt_device *td = hid_get_drvdata(hdev);
 290         struct mt_class *cls = &td->mtclass;
 291         int code;
 292
 293         /* Only map fields from TouchScreen or TouchPad collections.
 294         * We need to ignore fields that belong to other collections
 295         * such as Mouse that might have the same GenericDesktop usages. */
 296         if (field->application == HID_DG_TOUCHSCREEN)
 297                 set_bit(INPUT_PROP_DIRECT, hi->input->propbit);
 298         else if (field->application != HID_DG_TOUCHPAD)
 299                 return 0;
 300
 301         /* In case of an indirect device (touchpad), we need to add
 302          * specific BTN_TOOL_* to be handled by the synaptics xorg
 303          * driver.
 304          * We also consider that touchscreens providing buttons are touchpads.
 305          */
 306         if (field->application == HID_DG_TOUCHPAD ||
 307             (usage->hid & HID_USAGE_PAGE) == HID_UP_BUTTON ||
 308             cls->is_indirect) {
 309                 set_bit(INPUT_PROP_POINTER, hi->input->propbit);
 310                 set_bit(BTN_TOOL_FINGER, hi->input->keybit);
 311                 set_bit(BTN_TOOL_DOUBLETAP, hi->input->keybit);
 312                 set_bit(BTN_TOOL_TRIPLETAP, hi->input->keybit);
 313                 set_bit(BTN_TOOL_QUADTAP, hi->input->keybit);
 314         }
 315
 316         /* eGalax devices provide a Digitizer.Stylus input which overrides
 317          * the correct Digitizers.Finger X/Y ranges.
 318          * Let's just ignore this input. */
 319         if (field->physical == HID_DG_STYLUS)
 320                 return -1;
 321
 322         switch (usage->hid & HID_USAGE_PAGE) {
 323
 324         case HID_UP_GENDESK:
 325                 switch (usage->hid) {
 326                 case HID_GD_X:
 327                         hid_map_usage(hi, usage, bit, max,
 328                                         EV_ABS, ABS_MT_POSITION_X);
 329                         set_abs(hi->input, ABS_MT_POSITION_X, field,
 330                                 cls->sn_move);
 331                         /* touchscreen emulation */
 332                         set_abs(hi->input, ABS_X, field, cls->sn_move);
 333                         set_last_slot_field(usage, td, hi);
 334                         td->last_field_index = field->index;
 335                         return 1;
 336                 case HID_GD_Y:
 337                         hid_map_usage(hi, usage, bit, max,
 338                                         EV_ABS, ABS_MT_POSITION_Y);
 339                         set_abs(hi->input, ABS_MT_POSITION_Y, field,
 340                                 cls->sn_move);
 341                         /* touchscreen emulation */
 342                         set_abs(hi->input, ABS_Y, field, cls->sn_move);
 343                         set_last_slot_field(usage, td, hi);
 344                         td->last_field_index = field->index;
 345                         return 1;
 346                 }
 347                 return 0;
 348
 349         case HID_UP_DIGITIZER:
 350                 switch (usage->hid) {
 351                 case HID_DG_INRANGE:
 352                         set_last_slot_field(usage, td, hi);
 353                         td->last_field_index = field->index;
 354                         return 1;
 355                 case HID_DG_CONFIDENCE:
 356                         set_last_slot_field(usage, td, hi);
 357                         td->last_field_index = field->index;
 358                         return 1;
 359                 case HID_DG_TIPSWITCH:
 360                         hid_map_usage(hi, usage, bit, max, EV_KEY, BTN_TOUCH);
 361                         input_set_capability(hi->input, EV_KEY, BTN_TOUCH);
 362                         set_last_slot_field(usage, td, hi);
 363                         td->last_field_index = field->index;
 364                         return 1;
 365                 case HID_DG_CONTACTID:
 366                         if (!td->maxcontacts)
 367                                 td->maxcontacts = MT_DEFAULT_MAXCONTACT;
 368                         input_mt_init_slots(hi->input, td->maxcontacts);
 369                         td->last_slot_field = usage->hid;
 370                         td->last_field_index = field->index;
 371                         td->touches_by_report++;
 372                         return 1;
 373                 case HID_DG_WIDTH:
 374                         hid_map_usage(hi, usage, bit, max,
 375                                         EV_ABS, ABS_MT_TOUCH_MAJOR);
 376                         set_abs(hi->input, ABS_MT_TOUCH_MAJOR, field,
 377                                 cls->sn_width);
 378                         set_last_slot_field(usage, td, hi);
 379                         td->last_field_index = field->index;
 380                         return 1;
 381                 case HID_DG_HEIGHT:
 382                         hid_map_usage(hi, usage, bit, max,
 383                                         EV_ABS, ABS_MT_TOUCH_MINOR);
 384                         set_abs(hi->input, ABS_MT_TOUCH_MINOR, field,
 385                                 cls->sn_height);
 386                         input_set_abs_params(hi->input,
 387                                         ABS_MT_ORIENTATION, 0, 1, 0, 0);
 388                         set_last_slot_field(usage, td, hi);
 389                         td->last_field_index = field->index;
 390                         return 1;
 391                 case HID_DG_TIPPRESSURE:
 392                         hid_map_usage(hi, usage, bit, max,
 393                                         EV_ABS, ABS_MT_PRESSURE);
 394                         set_abs(hi->input, ABS_MT_PRESSURE, field,
 395                                 cls->sn_pressure);
 396                         /* touchscreen emulation */
 397                         set_abs(hi->input, ABS_PRESSURE, field,
 398                                 cls->sn_pressure);
 399                         set_last_slot_field(usage, td, hi);
 400                         td->last_field_index = field->index;
 401                         return 1;
 402                 case HID_DG_CONTACTCOUNT:
 403                         td->last_field_index = field->index;
 404                         return 1;
 405                 case HID_DG_CONTACTMAX:
 406                         /* we don't set td->last_slot_field as contactcount and
 407                          * contact max are global to the report */
 408                         td->last_field_index = field->index;
 409                         return -1;
 410                 }
 411                 case HID_DG_TOUCH:
 412                         /* Legacy devices use TIPSWITCH and not TOUCH.
 413                          * Let's just ignore this field. */
 414                         return -1;
 415                 /* let hid-input decide for the others */
 416                 return 0;
 417
 418         case HID_UP_BUTTON:
 419                 code = BTN_MOUSE + ((usage->hid - 1) & HID_USAGE);
 420                 hid_map_usage(hi, usage, bit, max, EV_KEY, code);
 421                 input_set_capability(hi->input, EV_KEY, code);
 422                 return 1;
 423
 424         case 0xff000000:
 425                 /* we do not want to map these: no input-oriented meaning */
 426                 return -1;
 427         }
 428
 429         return 0;
 430 }
 431
 432 static int mt_input_mapped(struct hid_device *hdev, struct hid_input *hi,
 433                 struct hid_field *field, struct hid_usage *usage,
 434                 unsigned long **bit, int *max)
 435 {
 436         if (usage->type == EV_KEY || usage->type == EV_ABS)
 437                 set_bit(usage->type, hi->input->evbit);
 438
 439         return -1;
 440 }
 441
 442 static int mt_compute_slot(struct mt_device *td)
 443 {
 444         __s32 quirks = td->mtclass.quirks;
 445
 446         if (quirks & MT_QUIRK_SLOT_IS_CONTACTID)
 447                 return td->curdata.contactid;
 448
 449         if (quirks & MT_QUIRK_CYPRESS)
 450                 return cypress_compute_slot(td);
 451
 452         if (quirks & MT_QUIRK_SLOT_IS_CONTACTNUMBER)
 453                 return td->num_received;
 454
 455         if (quirks & MT_QUIRK_SLOT_IS_CONTACTID_MINUS_ONE)
 456                 return td->curdata.contactid - 1;
 457
 458         return find_slot_from_contactid(td);
 459 }
 460
 461 /*
 462  * this function is called when a whole contact has been processed,
 463  * so that it can assign it to a slot and store the data there
 464  */
 465 static void mt_complete_slot(struct mt_device *td)
 466 {
 467         td->curdata.seen_in_this_frame = true;
 468         if (td->curvalid) {
 469                 int slotnum = mt_compute_slot(td);
 470
 471                 if (slotnum >= 0 && slotnum < td->maxcontacts)
 472                         td->slots[slotnum] = td->curdata;
 473         }
 474         td->num_received++;
 475 }
 476
 477
 478 /*
 479  * this function is called when a whole packet has been received and processed,
 480  * so that it can decide what to send to the input layer.
 481  */
 482 static void mt_emit_event(struct mt_device *td, struct input_dev *input)
 483 {
 484         int i;
 485
 486         for (i = 0; i < td->maxcontacts; ++i) {
 487                 struct mt_slot *s = &(td->slots[i]);
 488                 if ((td->mtclass.quirks & MT_QUIRK_NOT_SEEN_MEANS_UP) &&
 489                         !s->seen_in_this_frame) {
 490                         s->touch_state = false;
 491                 }
 492
 493                 input_mt_slot(input, i);
 494                 input_mt_report_slot_state(input, MT_TOOL_FINGER,
 495                         s->touch_state);
 496                 if (s->touch_state) {
 497                         /* this finger is on the screen */
 498                         int wide = (s->w > s->h);
 499                         /* divided by two to match visual scale of touch */
 500                         int major = max(s->w, s->h) >> 1;
 501                         int minor = min(s->w, s->h) >> 1;
 502
 503                         input_event(input, EV_ABS, ABS_MT_POSITION_X, s->x);
 504                         input_event(input, EV_ABS, ABS_MT_POSITION_Y, s->y);
 505                         input_event(input, EV_ABS, ABS_MT_ORIENTATION, wide);
 506                         input_event(input, EV_ABS, ABS_MT_PRESSURE, s->p);
 507                         input_event(input, EV_ABS, ABS_MT_TOUCH_MAJOR, major);
 508                         input_event(input, EV_ABS, ABS_MT_TOUCH_MINOR, minor);
 509                 }
 510                 s->seen_in_this_frame = false;
 511
 512         }
 513
 514         input_mt_report_pointer_emulation(input, true);
 515         input_sync(input);
 516         td->num_received = 0;
 517 }
 518
 519
 520
 521 static int mt_event(struct hid_device *hid, struct hid_field *field,
 522                                 struct hid_usage *usage, __s32 value)
 523 {
 524         struct mt_device *td = hid_get_drvdata(hid);
 525         __s32 quirks = td->mtclass.quirks;
 526
 527         if (hid->claimed & HID_CLAIMED_INPUT && td->slots) {
 528                 switch (usage->hid) {
 529                 case HID_DG_INRANGE:
 530                         if (quirks & MT_QUIRK_ALWAYS_VALID)
 531                                 td->curvalid = true;
 532                         else if (quirks & MT_QUIRK_VALID_IS_INRANGE)
 533                                 td->curvalid = value;
 534                         break;
 535                 case HID_DG_TIPSWITCH:
 536                         if (quirks & MT_QUIRK_NOT_SEEN_MEANS_UP)
 537                                 td->curvalid = value;
 538                         td->curdata.touch_state = value;
 539                         break;
 540                 case HID_DG_CONFIDENCE:
 541                         if (quirks & MT_QUIRK_VALID_IS_CONFIDENCE)
 542                                 td->curvalid = value;
 543                         break;
 544                 case HID_DG_CONTACTID:
 545                         td->curdata.contactid = value;
 546                         break;
 547                 case HID_DG_TIPPRESSURE:
 548                         td->curdata.p = value;
 549                         break;
 550                 case HID_GD_X:
 551                         td->curdata.x = value;
 552                         break;
 553                 case HID_GD_Y:
 554                         td->curdata.y = value;
 555                         break;
 556                 case HID_DG_WIDTH:
 557                         td->curdata.w = value;
 558                         break;
 559                 case HID_DG_HEIGHT:
 560                         td->curdata.h = value;
 561                         break;
 562                 case HID_DG_CONTACTCOUNT:
 563                         /*
 564                          * Includes multi-packet support where subsequent
 565                          * packets are sent with zero contactcount.
 566                          */
 567                         if (value)
 568                                 td->num_expected = value;
 569                         break;
 570                 case HID_DG_TOUCH:
 571                         /* do nothing */
 572                         break;
 573
 574                 default:
 575                         /* fallback to the generic hidinput handling */
 576                         return 0;
 577                 }
 578
 579                 if (usage->hid == td->last_slot_field)
 580                         mt_complete_slot(td);
 581
 582                 if (field->index == td->last_field_index
 583                         && td->num_received >= td->num_expected)
 584                         mt_emit_event(td, field->hidinput->input);
 585
 586         }
 587
 588         /* we have handled the hidinput part, now remains hiddev */
 589         if (hid->claimed & HID_CLAIMED_HIDDEV && hid->hiddev_hid_event)
 590                 hid->hiddev_hid_event(hid, field, usage, value);
 591
 592         return 1;
 593 }
 594
 595 static void mt_set_input_mode(struct hid_device *hdev)
 596 {
 597         struct mt_device *td = hid_get_drvdata(hdev);
 598         struct hid_report *r;
 599         struct hid_report_enum *re;
 600
 601         if (td->inputmode < 0)
 602                 return;
 603
 604         re = &(hdev->report_enum[HID_FEATURE_REPORT]);
 605         r = re->report_id_hash[td->inputmode];
 606         if (r) {
 607                 r->field[0]->value[0] = 0x02;
 608                 usbhid_submit_report(hdev, r, USB_DIR_OUT);
 609         }
 610 }
 611
 612 static void mt_set_maxcontacts(struct hid_device *hdev)
 613 {
 614         struct mt_device *td = hid_get_drvdata(hdev);
 615         struct hid_report *r;
 616         struct hid_report_enum *re;
 617         int fieldmax, max;
 618
 619         if (td->maxcontact_report_id < 0)
 620                 return;
 621
 622         if (!td->mtclass.maxcontacts)
 623                 return;
 624
 625         re = &hdev->report_enum[HID_FEATURE_REPORT];
 626         r = re->report_id_hash[td->maxcontact_report_id];
 627         if (r) {
 628                 max = td->mtclass.maxcontacts;
 629                 fieldmax = r->field[0]->logical_maximum;
 630                 max = min(fieldmax, max);
 631                 if (r->field[0]->value[0] != max) {
 632                         r->field[0]->value[0] = max;
 633                         usbhid_submit_report(hdev, r, USB_DIR_OUT);
 634                 }
 635         }
 636 }
 637
 638 static int mt_probe(struct hid_device *hdev, const struct hid_device_id *id)
 639 {
 640         int ret, i;
 641         struct mt_device *td;
 642         struct mt_class *mtclass = mt_classes; /* MT_CLS_DEFAULT */
 643
 644         if (id) {
 645                 for (i = 0; mt_classes[i].name ; i++) {
 646                         if (id->driver_data == mt_classes[i].name) {
 647                                 mtclass = &(mt_classes[i]);
 648                                 break;
 649                         }
 650                 }
 651         }
 652
 653         /* This allows the driver to correctly support devices
 654          * that emit events over several HID messages.
 655          */
 656         hdev->quirks |= HID_QUIRK_NO_INPUT_SYNC;
 657         hdev->quirks &= ~HID_QUIRK_MULTITOUCH;
 658
 659         td = kzalloc(sizeof(struct mt_device), GFP_KERNEL);
 660         if (!td) {
 661                 dev_err(&hdev->dev, "cannot allocate multitouch data\n");
 662                 return -ENOMEM;
 663         }
 664         td->mtclass = *mtclass;
 665         td->inputmode = -1;
 666         td->maxcontact_report_id = -1;
 667         hid_set_drvdata(hdev, td);
 668
 669         ret = hid_parse(hdev);
 670         if (ret != 0)
 671                 goto fail;
 672
 673         ret = hid_hw_start(hdev, HID_CONNECT_DEFAULT);
 674         if (ret)
 675                 goto fail;
 676
 677         if (!id && td->touches_by_report == 1) {
 678                 /* the device has been sent by hid-generic */
 679                 mtclass = &td->mtclass;
 680                 mtclass->quirks |= MT_QUIRK_ALWAYS_VALID;
 681                 mtclass->quirks &= ~MT_QUIRK_NOT_SEEN_MEANS_UP;
 682                 mtclass->quirks &= ~MT_QUIRK_VALID_IS_INRANGE;
 683                 mtclass->quirks &= ~MT_QUIRK_VALID_IS_CONFIDENCE;
 684         }
 685
 686         td->slots = kzalloc(td->maxcontacts * sizeof(struct mt_slot),
 687                                 GFP_KERNEL);
 688         if (!td->slots) {
 689                 dev_err(&hdev->dev, "cannot allocate multitouch slots\n");
 690                 hid_hw_stop(hdev);
 691                 ret = -ENOMEM;
 692                 goto fail;
 693         }
 694
 695         ret = sysfs_create_group(&hdev->dev.kobj, &mt_attribute_group);
 696
 697         mt_set_maxcontacts(hdev);
 698         mt_set_input_mode(hdev);
 699
 700         return 0;
 701
 702 fail:
 703         kfree(td);
 704         return ret;
 705 }
 706
 707 #ifdef CONFIG_PM
 708 static int mt_reset_resume(struct hid_device *hdev)
 709 {
 710         mt_set_maxcontacts(hdev);
 711         mt_set_input_mode(hdev);
 712         return 0;
 713 }
 714 #endif
 715
 716 static void mt_remove(struct hid_device *hdev)
 717 {
 718         struct mt_device *td = hid_get_drvdata(hdev);
 719         sysfs_remove_group(&hdev->dev.kobj, &mt_attribute_group);
 720         hid_hw_stop(hdev);
 721         kfree(td->slots);
 722         kfree(td);
 723         hid_set_drvdata(hdev, NULL);
 724 }
 725
 726 static const struct hid_device_id mt_devices[] = {
 727
 728         /* 3M panels */
 729         { .driver_data = MT_CLS_3M,
 730                 HID_USB_DEVICE(USB_VENDOR_ID_3M,
 731                         USB_DEVICE_ID_3M1968) },
 732         { .driver_data = MT_CLS_3M,
 733                 HID_USB_DEVICE(USB_VENDOR_ID_3M,
 734                         USB_DEVICE_ID_3M2256) },
 735         { .driver_data = MT_CLS_3M,
 736                 HID_USB_DEVICE(USB_VENDOR_ID_3M,
 737                         USB_DEVICE_ID_3M3266) },
 738
 739         /* ActionStar panels */
 740         { .driver_data = MT_CLS_DEFAULT,
 741                 HID_USB_DEVICE(USB_VENDOR_ID_ACTIONSTAR,
 742                         USB_DEVICE_ID_ACTIONSTAR_1011) },
 743
 744         /* Atmel panels */
 745         { .driver_data = MT_CLS_SERIAL,
 746                 HID_USB_DEVICE(USB_VENDOR_ID_ATMEL,
 747                         USB_DEVICE_ID_ATMEL_MULTITOUCH) },
 748         { .driver_data = MT_CLS_SERIAL,
 749                 HID_USB_DEVICE(USB_VENDOR_ID_ATMEL,
 750                         USB_DEVICE_ID_ATMEL_MXT_DIGITIZER) },
 751
 752         /* Cando panels */
 753         { .driver_data = MT_CLS_DUAL_INRANGE_CONTACTNUMBER,
 754                 HID_USB_DEVICE(USB_VENDOR_ID_CANDO,
 755                         USB_DEVICE_ID_CANDO_MULTI_TOUCH) },
 756         { .driver_data = MT_CLS_DUAL_INRANGE_CONTACTNUMBER,
 757                 HID_USB_DEVICE(USB_VENDOR_ID_CANDO,
 758                         USB_DEVICE_ID_CANDO_MULTI_TOUCH_10_1) },
 759         { .driver_data = MT_CLS_DUAL_INRANGE_CONTACTNUMBER,
 760                 HID_USB_DEVICE(USB_VENDOR_ID_CANDO,
 761                         USB_DEVICE_ID_CANDO_MULTI_TOUCH_11_6) },
 762         { .driver_data = MT_CLS_DUAL_INRANGE_CONTACTNUMBER,
 763                 HID_USB_DEVICE(USB_VENDOR_ID_CANDO,
 764                         USB_DEVICE_ID_CANDO_MULTI_TOUCH_15_6) },
 765
 766         /* Chunghwa Telecom touch panels */
 767         {  .driver_data = MT_CLS_DEFAULT,
 768                 HID_USB_DEVICE(USB_VENDOR_ID_CHUNGHWAT,
 769                         USB_DEVICE_ID_CHUNGHWAT_MULTITOUCH) },
 770
 771         /* CVTouch panels */
 772         { .driver_data = MT_CLS_DEFAULT,
 773                 HID_USB_DEVICE(USB_VENDOR_ID_CVTOUCH,
 774                         USB_DEVICE_ID_CVTOUCH_SCREEN) },
 775
 776         /* Cypress panel */
 777         { .driver_data = MT_CLS_CYPRESS,
 778                 HID_USB_DEVICE(USB_VENDOR_ID_CYPRESS,
 779                         USB_DEVICE_ID_CYPRESS_TRUETOUCH) },
 780
 781         /* eGalax devices (resistive) */
 782         { .driver_data = MT_CLS_EGALAX,
 783                 HID_USB_DEVICE(USB_VENDOR_ID_DWAV,
 784                         USB_DEVICE_ID_DWAV_EGALAX_MULTITOUCH_480D) },
 785         { .driver_data = MT_CLS_EGALAX,
 786                 HID_USB_DEVICE(USB_VENDOR_ID_DWAV,
 787                         USB_DEVICE_ID_DWAV_EGALAX_MULTITOUCH_480E) },
 788
 789         /* eGalax devices (capacitive) */
 790         { .driver_data = MT_CLS_EGALAX,
 791                 HID_USB_DEVICE(USB_VENDOR_ID_DWAV,
 792                         USB_DEVICE_ID_DWAV_EGALAX_MULTITOUCH_720C) },
 793         { .driver_data = MT_CLS_EGALAX_SERIAL,
 794                 HID_USB_DEVICE(USB_VENDOR_ID_DWAV,
 795                         USB_DEVICE_ID_DWAV_EGALAX_MULTITOUCH_7207) },
 796         { .driver_data = MT_CLS_EGALAX_SERIAL,
 797                 HID_USB_DEVICE(USB_VENDOR_ID_DWAV,
 798                         USB_DEVICE_ID_DWAV_EGALAX_MULTITOUCH_725E) },
 799         { .driver_data = MT_CLS_EGALAX_SERIAL,
 800                 HID_USB_DEVICE(USB_VENDOR_ID_DWAV,
 801                         USB_DEVICE_ID_DWAV_EGALAX_MULTITOUCH_7224) },
 802         { .driver_data = MT_CLS_EGALAX_SERIAL,
 803                 HID_USB_DEVICE(USB_VENDOR_ID_DWAV,
 804                         USB_DEVICE_ID_DWAV_EGALAX_MULTITOUCH_722A) },
 805         { .driver_data = MT_CLS_EGALAX,
 806                 HID_USB_DEVICE(USB_VENDOR_ID_DWAV,
 807                         USB_DEVICE_ID_DWAV_EGALAX_MULTITOUCH_726B) },
 808         { .driver_data = MT_CLS_EGALAX_SERIAL,
 809                 HID_USB_DEVICE(USB_VENDOR_ID_DWAV,
 810                         USB_DEVICE_ID_DWAV_EGALAX_MULTITOUCH_7262) },
 811         { .driver_data = MT_CLS_EGALAX,
 812                 HID_USB_DEVICE(USB_VENDOR_ID_DWAV,
 813                         USB_DEVICE_ID_DWAV_EGALAX_MULTITOUCH_72A1) },
 814         { .driver_data = MT_CLS_EGALAX_SERIAL,
 815                 HID_USB_DEVICE(USB_VENDOR_ID_DWAV,
 816                         USB_DEVICE_ID_DWAV_EGALAX_MULTITOUCH_72AA) },
 817         { .driver_data = MT_CLS_EGALAX,
 818                 HID_USB_DEVICE(USB_VENDOR_ID_DWAV,
 819                         USB_DEVICE_ID_DWAV_EGALAX_MULTITOUCH_72FA) },
 820         { .driver_data = MT_CLS_EGALAX,
 821                 HID_USB_DEVICE(USB_VENDOR_ID_DWAV,
 822                         USB_DEVICE_ID_DWAV_EGALAX_MULTITOUCH_7302) },
 823         { .driver_data = MT_CLS_EGALAX_SERIAL,
 824                 HID_USB_DEVICE(USB_VENDOR_ID_DWAV,
 825                         USB_DEVICE_ID_DWAV_EGALAX_MULTITOUCH_7349) },
 826         { .driver_data = MT_CLS_EGALAX_SERIAL,
 827                 HID_USB_DEVICE(USB_VENDOR_ID_DWAV,
 828                         USB_DEVICE_ID_DWAV_EGALAX_MULTITOUCH_A001) },
 829
 830         /* Elo TouchSystems IntelliTouch Plus panel */
 831         { .driver_data = MT_CLS_DUAL_NSMU_CONTACTID,
 832                 HID_USB_DEVICE(USB_VENDOR_ID_ELO,
 833                         USB_DEVICE_ID_ELO_TS2515) },
 834
 835         /* GeneralTouch panel */
 836         { .driver_data = MT_CLS_DUAL_INRANGE_CONTACTNUMBER,
 837                 HID_USB_DEVICE(USB_VENDOR_ID_GENERAL_TOUCH,
 838                         USB_DEVICE_ID_GENERAL_TOUCH_WIN7_TWOFINGERS) },
 839
 840         /* Gametel game controller */
 841         { .driver_data = MT_CLS_DEFAULT,
 842                 HID_BLUETOOTH_DEVICE(USB_VENDOR_ID_FRUCTEL,
 843                         USB_DEVICE_ID_GAMETEL_MT_MODE) },
 844
 845         /* GoodTouch panels */
 846         { .driver_data = MT_CLS_DEFAULT,
 847                 HID_USB_DEVICE(USB_VENDOR_ID_GOODTOUCH,
 848                         USB_DEVICE_ID_GOODTOUCH_000f) },
 849
 850         /* Hanvon panels */
 851         { .driver_data = MT_CLS_DUAL_INRANGE_CONTACTID,
 852                 HID_USB_DEVICE(USB_VENDOR_ID_HANVON_ALT,
 853                         USB_DEVICE_ID_HANVON_ALT_MULTITOUCH) },
 854
 855         /* Ideacom panel */
 856         { .driver_data = MT_CLS_SERIAL,
 857                 HID_USB_DEVICE(USB_VENDOR_ID_IDEACOM,
 858                         USB_DEVICE_ID_IDEACOM_IDC6650) },
 859         { .driver_data = MT_CLS_SERIAL,
 860                 HID_USB_DEVICE(USB_VENDOR_ID_IDEACOM,
 861                         USB_DEVICE_ID_IDEACOM_IDC6651) },
 862
 863         /* Ilitek dual touch panel */
 864         {  .driver_data = MT_CLS_DEFAULT,
 865                 HID_USB_DEVICE(USB_VENDOR_ID_ILITEK,
 866                         USB_DEVICE_ID_ILITEK_MULTITOUCH) },
 867
 868         /* IRTOUCH panels */
 869         { .driver_data = MT_CLS_DUAL_INRANGE_CONTACTID,
 870                 HID_USB_DEVICE(USB_VENDOR_ID_IRTOUCHSYSTEMS,
 871                         USB_DEVICE_ID_IRTOUCH_INFRARED_USB) },
 872
 873         /* LG Display panels */
 874         { .driver_data = MT_CLS_DEFAULT,
 875                 HID_USB_DEVICE(USB_VENDOR_ID_LG,
 876                         USB_DEVICE_ID_LG_MULTITOUCH) },
 877
 878         /* Lumio panels */
 879         { .driver_data = MT_CLS_CONFIDENCE_MINUS_ONE,
 880                 HID_USB_DEVICE(USB_VENDOR_ID_LUMIO,
 881                         USB_DEVICE_ID_CRYSTALTOUCH) },
 882         { .driver_data = MT_CLS_CONFIDENCE_MINUS_ONE,
 883                 HID_USB_DEVICE(USB_VENDOR_ID_LUMIO,
 884                         USB_DEVICE_ID_CRYSTALTOUCH_DUAL) },
 885
 886         /* MosArt panels */
 887         { .driver_data = MT_CLS_CONFIDENCE_MINUS_ONE,
 888                 HID_USB_DEVICE(USB_VENDOR_ID_ASUS,
 889                         USB_DEVICE_ID_ASUS_T91MT)},
 890         { .driver_data = MT_CLS_CONFIDENCE_MINUS_ONE,
 891                 HID_USB_DEVICE(USB_VENDOR_ID_ASUS,
 892                         USB_DEVICE_ID_ASUSTEK_MULTITOUCH_YFO) },
 893         { .driver_data = MT_CLS_CONFIDENCE_MINUS_ONE,
 894                 HID_USB_DEVICE(USB_VENDOR_ID_TURBOX,
 895                         USB_DEVICE_ID_TURBOX_TOUCHSCREEN_MOSART) },
 896
 897         /* Panasonic panels */
 898         { .driver_data = MT_CLS_PANASONIC,
 899                 HID_USB_DEVICE(USB_VENDOR_ID_PANASONIC,
 900                         USB_DEVICE_ID_PANABOARD_UBT780) },
 901         { .driver_data = MT_CLS_PANASONIC,
 902                 HID_USB_DEVICE(USB_VENDOR_ID_PANASONIC,
 903                         USB_DEVICE_ID_PANABOARD_UBT880) },
 904
 905         /* PenMount panels */
 906         { .driver_data = MT_CLS_CONFIDENCE,
 907                 HID_USB_DEVICE(USB_VENDOR_ID_PENMOUNT,
 908                         USB_DEVICE_ID_PENMOUNT_PCI) },
 909
 910         /* PixArt optical touch screen */
 911         { .driver_data = MT_CLS_INRANGE_CONTACTNUMBER,
 912                 HID_USB_DEVICE(USB_VENDOR_ID_PIXART,
 913                         USB_DEVICE_ID_PIXART_OPTICAL_TOUCH_SCREEN) },
 914         { .driver_data = MT_CLS_INRANGE_CONTACTNUMBER,
 915                 HID_USB_DEVICE(USB_VENDOR_ID_PIXART,
 916                         USB_DEVICE_ID_PIXART_OPTICAL_TOUCH_SCREEN1) },
 917         { .driver_data = MT_CLS_INRANGE_CONTACTNUMBER,
 918                 HID_USB_DEVICE(USB_VENDOR_ID_PIXART,
 919                         USB_DEVICE_ID_PIXART_OPTICAL_TOUCH_SCREEN2) },
 920
 921         /* PixCir-based panels */
 922         { .driver_data = MT_CLS_DUAL_INRANGE_CONTACTID,
 923                 HID_USB_DEVICE(USB_VENDOR_ID_HANVON,
 924                         USB_DEVICE_ID_HANVON_MULTITOUCH) },
 925         { .driver_data = MT_CLS_DUAL_INRANGE_CONTACTID,
 926                 HID_USB_DEVICE(USB_VENDOR_ID_CANDO,
 927                         USB_DEVICE_ID_CANDO_PIXCIR_MULTI_TOUCH) },
 928
 929         /* Quanta-based panels */
 930         { .driver_data = MT_CLS_CONFIDENCE_CONTACT_ID,
 931                 HID_USB_DEVICE(USB_VENDOR_ID_QUANTA,
 932                         USB_DEVICE_ID_QUANTA_OPTICAL_TOUCH) },
 933         { .driver_data = MT_CLS_CONFIDENCE_CONTACT_ID,
 934                 HID_USB_DEVICE(USB_VENDOR_ID_QUANTA,
 935                         USB_DEVICE_ID_QUANTA_OPTICAL_TOUCH_3001) },
 936         { .driver_data = MT_CLS_CONFIDENCE_CONTACT_ID,
 937                 HID_USB_DEVICE(USB_VENDOR_ID_QUANTA,
 938                         USB_DEVICE_ID_QUANTA_OPTICAL_TOUCH_3008) },
 939
 940         /* Stantum panels */
 941         { .driver_data = MT_CLS_CONFIDENCE,
 942                 HID_USB_DEVICE(USB_VENDOR_ID_STANTUM,
 943                         USB_DEVICE_ID_MTP)},
 944         { .driver_data = MT_CLS_CONFIDENCE,
 945                 HID_USB_DEVICE(USB_VENDOR_ID_STANTUM_STM,
 946                         USB_DEVICE_ID_MTP_STM)},
 947         { .driver_data = MT_CLS_CONFIDENCE,
 948                 HID_USB_DEVICE(USB_VENDOR_ID_STANTUM_SITRONIX,
 949                         USB_DEVICE_ID_MTP_SITRONIX)},
 950
 951         /* TopSeed panels */
 952         { .driver_data = MT_CLS_TOPSEED,
 953                 HID_USB_DEVICE(USB_VENDOR_ID_TOPSEED2,
 954                         USB_DEVICE_ID_TOPSEED2_PERIPAD_701) },
 955
 956         /* Touch International panels */
 957         { .driver_data = MT_CLS_DEFAULT,
 958                 HID_USB_DEVICE(USB_VENDOR_ID_TOUCH_INTL,
 959                         USB_DEVICE_ID_TOUCH_INTL_MULTI_TOUCH) },
 960
 961         /* Unitec panels */
 962         { .driver_data = MT_CLS_DEFAULT,
 963                 HID_USB_DEVICE(USB_VENDOR_ID_UNITEC,
 964                         USB_DEVICE_ID_UNITEC_USB_TOUCH_0709) },
 965         { .driver_data = MT_CLS_DEFAULT,
 966                 HID_USB_DEVICE(USB_VENDOR_ID_UNITEC,
 967                         USB_DEVICE_ID_UNITEC_USB_TOUCH_0A19) },
 968         /* XAT */
 969         { .driver_data = MT_CLS_DEFAULT,
 970                 HID_USB_DEVICE(USB_VENDOR_ID_XAT,
 971                         USB_DEVICE_ID_XAT_CSR) },
 972
 973         /* Xiroku */
 974         { .driver_data = MT_CLS_DEFAULT,
 975                 HID_USB_DEVICE(USB_VENDOR_ID_XIROKU,
 976                         USB_DEVICE_ID_XIROKU_SPX) },
 977         { .driver_data = MT_CLS_DEFAULT,
 978                 HID_USB_DEVICE(USB_VENDOR_ID_XIROKU,
 979                         USB_DEVICE_ID_XIROKU_MPX) },
 980         { .driver_data = MT_CLS_DEFAULT,
 981                 HID_USB_DEVICE(USB_VENDOR_ID_XIROKU,
 982                         USB_DEVICE_ID_XIROKU_CSR) },
 983         { .driver_data = MT_CLS_DEFAULT,
 984                 HID_USB_DEVICE(USB_VENDOR_ID_XIROKU,
 985                         USB_DEVICE_ID_XIROKU_SPX1) },
 986         { .driver_data = MT_CLS_DEFAULT,
 987                 HID_USB_DEVICE(USB_VENDOR_ID_XIROKU,
 988                         USB_DEVICE_ID_XIROKU_MPX1) },
 989         { .driver_data = MT_CLS_DEFAULT,
 990                 HID_USB_DEVICE(USB_VENDOR_ID_XIROKU,
 991                         USB_DEVICE_ID_XIROKU_CSR1) },
 992         { .driver_data = MT_CLS_DEFAULT,
 993                 HID_USB_DEVICE(USB_VENDOR_ID_XIROKU,
 994                         USB_DEVICE_ID_XIROKU_SPX2) },
 995         { .driver_data = MT_CLS_DEFAULT,
 996                 HID_USB_DEVICE(USB_VENDOR_ID_XIROKU,
 997                         USB_DEVICE_ID_XIROKU_MPX2) },
 998         { .driver_data = MT_CLS_DEFAULT,
 999                 HID_USB_DEVICE(USB_VENDOR_ID_XIROKU,
1000                         USB_DEVICE_ID_XIROKU_CSR2) },
1001
1002         { }
1003 };
1004 MODULE_DEVICE_TABLE(hid, mt_devices);
1005
1006 static const struct hid_usage_id mt_grabbed_usages[] = {
1007         { HID_ANY_ID, HID_ANY_ID, HID_ANY_ID },
1008         { HID_ANY_ID - 1, HID_ANY_ID - 1, HID_ANY_ID - 1}
1009 };
1010
1011 static struct hid_driver mt_driver = {
1012         .name = "hid-multitouch",
1013         .id_table = mt_devices,
1014         .probe = mt_probe,
1015         .remove = mt_remove,
1016         .input_mapping = mt_input_mapping,
1017         .input_mapped = mt_input_mapped,
1018         .feature_mapping = mt_feature_mapping,
1019         .usage_table = mt_grabbed_usages,
1020         .event = mt_event,
1021 #ifdef CONFIG_PM
1022         .reset_resume = mt_reset_resume,
1023 #endif
1024 };
1025
1026 static int __init mt_init(void)
1027 {
1028         return hid_register_driver(&mt_driver);
1029 }
1030
1031 static void __exit mt_exit(void)
1032 {
1033         hid_unregister_driver(&mt_driver);
1034 }
1035
1036 module_init(mt_init);
1037 module_exit(mt_exit);