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