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) 2010-2013 Benjamin Tissoires <benjamin.tissoires@gmail.com>
   6  *  Copyright (c) 2010-2012 Ecole Nationale de l'Aviation Civile, France
   7  *  Copyright (c) 2012-2013 Red Hat, Inc
   8  *
   9  *  This code is partly based on hid-egalax.c:
  10  *
  11  *  Copyright (c) 2010 Stephane Chatty <chatty@enac.fr>
  12  *  Copyright (c) 2010 Henrik Rydberg <rydberg@euromail.se>
  13  *  Copyright (c) 2010 Canonical, Ltd.
  14  *
  15  *  This code is partly based on hid-3m-pct.c:
  16  *
  17  *  Copyright (c) 2009-2010 Stephane Chatty <chatty@enac.fr>
  18  *  Copyright (c) 2010      Henrik Rydberg <rydberg@euromail.se>
  19  *  Copyright (c) 2010      Canonical, Ltd.
  20  *
  21  */
  22
  23 /*
  24  * This program is free software; you can redistribute it and/or modify it
  25  * under the terms of the GNU General Public License as published by the Free
  26  * Software Foundation; either version 2 of the License, or (at your option)
  27  * any later version.
  28  */
  29
  30 /*
  31  * This driver is regularly tested thanks to the tool hid-test[1].
  32  * This tool relies on hid-replay[2] and a database of hid devices[3].
  33  * Please run these regression tests before patching this module so that
  34  * your patch won't break existing known devices.
  35  *
  36  * [1] https://github.com/bentiss/hid-test
  37  * [2] https://github.com/bentiss/hid-replay
  38  * [3] https://github.com/bentiss/hid-devices
  39  */
  40
  41 #include <linux/device.h>
  42 #include <linux/hid.h>
  43 #include <linux/module.h>
  44 #include <linux/slab.h>
  45 #include <linux/input/mt.h>
  46 #include <linux/string.h>
  47
  48
  49 MODULE_AUTHOR("Stephane Chatty <chatty@enac.fr>");
  50 MODULE_AUTHOR("Benjamin Tissoires <benjamin.tissoires@gmail.com>");
  51 MODULE_DESCRIPTION("HID multitouch panels");
  52 MODULE_LICENSE("GPL");
  53
  54 #include "hid-ids.h"
  55
  56 /* quirks to control the device */
  57 #define MT_QUIRK_NOT_SEEN_MEANS_UP      (1 << 0)
  58 #define MT_QUIRK_SLOT_IS_CONTACTID      (1 << 1)
  59 #define MT_QUIRK_CYPRESS                (1 << 2)
  60 #define MT_QUIRK_SLOT_IS_CONTACTNUMBER  (1 << 3)
  61 #define MT_QUIRK_ALWAYS_VALID           (1 << 4)
  62 #define MT_QUIRK_VALID_IS_INRANGE       (1 << 5)
  63 #define MT_QUIRK_VALID_IS_CONFIDENCE    (1 << 6)
  64 #define MT_QUIRK_CONFIDENCE             (1 << 7)
  65 #define MT_QUIRK_SLOT_IS_CONTACTID_MINUS_ONE    (1 << 8)
  66 #define MT_QUIRK_NO_AREA                (1 << 9)
  67 #define MT_QUIRK_IGNORE_DUPLICATES      (1 << 10)
  68 #define MT_QUIRK_HOVERING               (1 << 11)
  69 #define MT_QUIRK_CONTACT_CNT_ACCURATE   (1 << 12)
  70 #define MT_QUIRK_FORCE_GET_FEATURE      (1 << 13)
  71 #define MT_QUIRK_FIX_CONST_CONTACT_ID   (1 << 14)
  72
  73 #define MT_INPUTMODE_TOUCHSCREEN        0x02
  74 #define MT_INPUTMODE_TOUCHPAD           0x03
  75
  76 #define MT_BUTTONTYPE_CLICKPAD          0
  77
  78 struct mt_slot {
  79         __s32 x, y, cx, cy, p, w, h;
  80         __s32 contactid;        /* the device ContactID assigned to this slot */
  81         bool touch_state;       /* is the touch valid? */
  82         bool inrange_state;     /* is the finger in proximity of the sensor? */
  83         bool confidence_state;  /* is the touch made by a finger? */
  84 };
  85
  86 struct mt_class {
  87         __s32 name;     /* MT_CLS */
  88         __s32 quirks;
  89         __s32 sn_move;  /* Signal/noise ratio for move events */
  90         __s32 sn_width; /* Signal/noise ratio for width events */
  91         __s32 sn_height;        /* Signal/noise ratio for height events */
  92         __s32 sn_pressure;      /* Signal/noise ratio for pressure events */
  93         __u8 maxcontacts;
  94         bool is_indirect;       /* true for touchpads */
  95         bool export_all_inputs; /* do not ignore mouse, keyboards, etc... */
  96 };
  97
  98 struct mt_fields {
  99         unsigned usages[HID_MAX_FIELDS];
 100         unsigned int length;
 101 };
 102
 103 struct mt_device {
 104         struct mt_slot curdata; /* placeholder of incoming data */
 105         struct mt_class mtclass;        /* our mt device class */
 106         struct mt_fields *fields;       /* temporary placeholder for storing the
 107                                            multitouch fields */
 108         int cc_index;   /* contact count field index in the report */
 109         int cc_value_index;     /* contact count value index in the field */
 110         unsigned last_slot_field;       /* the last field of a slot */
 111         unsigned mt_report_id;  /* the report ID of the multitouch device */
 112         unsigned long initial_quirks;   /* initial quirks state */
 113         __s16 inputmode;        /* InputMode HID feature, -1 if non-existent */
 114         __s16 inputmode_index;  /* InputMode HID feature index in the report */
 115         __s16 maxcontact_report_id;     /* Maximum Contact Number HID feature,
 116                                    -1 if non-existent */
 117         __u8 inputmode_value;  /* InputMode HID feature value */
 118         __u8 num_received;      /* how many contacts we received */
 119         __u8 num_expected;      /* expected last contact index */
 120         __u8 maxcontacts;
 121         __u8 touches_by_report; /* how many touches are present in one report:
 122                                 * 1 means we should use a serial protocol
 123                                 * > 1 means hybrid (multitouch) protocol */
 124         __u8 buttons_count;     /* number of physical buttons per touchpad */
 125         bool is_buttonpad;      /* is this device a button pad? */
 126         bool serial_maybe;      /* need to check for serial protocol */
 127         bool curvalid;          /* is the current contact valid? */
 128         unsigned mt_flags;      /* flags to pass to input-mt */
 129 };
 130
 131 static void mt_post_parse_default_settings(struct mt_device *td);
 132 static void mt_post_parse(struct mt_device *td);
 133
 134 /* classes of device behavior */
 135 #define MT_CLS_DEFAULT                          0x0001
 136
 137 #define MT_CLS_SERIAL                           0x0002
 138 #define MT_CLS_CONFIDENCE                       0x0003
 139 #define MT_CLS_CONFIDENCE_CONTACT_ID            0x0004
 140 #define MT_CLS_CONFIDENCE_MINUS_ONE             0x0005
 141 #define MT_CLS_DUAL_INRANGE_CONTACTID           0x0006
 142 #define MT_CLS_DUAL_INRANGE_CONTACTNUMBER       0x0007
 143 /* reserved                                     0x0008 */
 144 #define MT_CLS_INRANGE_CONTACTNUMBER            0x0009
 145 #define MT_CLS_NSMU                             0x000a
 146 /* reserved                                     0x0010 */
 147 /* reserved                                     0x0011 */
 148 #define MT_CLS_WIN_8                            0x0012
 149 #define MT_CLS_EXPORT_ALL_INPUTS                0x0013
 150
 151 /* vendor specific classes */
 152 #define MT_CLS_3M                               0x0101
 153 /* reserved                                     0x0102 */
 154 #define MT_CLS_EGALAX                           0x0103
 155 #define MT_CLS_EGALAX_SERIAL                    0x0104
 156 #define MT_CLS_TOPSEED                          0x0105
 157 #define MT_CLS_PANASONIC                        0x0106
 158 #define MT_CLS_FLATFROG                         0x0107
 159 #define MT_CLS_GENERALTOUCH_TWOFINGERS          0x0108
 160 #define MT_CLS_GENERALTOUCH_PWT_TENFINGERS      0x0109
 161 #define MT_CLS_LG                               0x010a
 162 #define MT_CLS_VTL                              0x0110
 163
 164 #define MT_DEFAULT_MAXCONTACT   10
 165 #define MT_MAX_MAXCONTACT       250
 166
 167 #define MT_USB_DEVICE(v, p)     HID_DEVICE(BUS_USB, HID_GROUP_MULTITOUCH, v, p)
 168 #define MT_BT_DEVICE(v, p)      HID_DEVICE(BUS_BLUETOOTH, HID_GROUP_MULTITOUCH, v, p)
 169
 170 /*
 171  * these device-dependent functions determine what slot corresponds
 172  * to a valid contact that was just read.
 173  */
 174
 175 static int cypress_compute_slot(struct mt_device *td)
 176 {
 177         if (td->curdata.contactid != 0 || td->num_received == 0)
 178                 return td->curdata.contactid;
 179         else
 180                 return -1;
 181 }
 182
 183 static struct mt_class mt_classes[] = {
 184         { .name = MT_CLS_DEFAULT,
 185                 .quirks = MT_QUIRK_ALWAYS_VALID |
 186                         MT_QUIRK_CONTACT_CNT_ACCURATE },
 187         { .name = MT_CLS_NSMU,
 188                 .quirks = MT_QUIRK_NOT_SEEN_MEANS_UP },
 189         { .name = MT_CLS_SERIAL,
 190                 .quirks = MT_QUIRK_ALWAYS_VALID},
 191         { .name = MT_CLS_CONFIDENCE,
 192                 .quirks = MT_QUIRK_VALID_IS_CONFIDENCE },
 193         { .name = MT_CLS_CONFIDENCE_CONTACT_ID,
 194                 .quirks = MT_QUIRK_VALID_IS_CONFIDENCE |
 195                         MT_QUIRK_SLOT_IS_CONTACTID },
 196         { .name = MT_CLS_CONFIDENCE_MINUS_ONE,
 197                 .quirks = MT_QUIRK_VALID_IS_CONFIDENCE |
 198                         MT_QUIRK_SLOT_IS_CONTACTID_MINUS_ONE },
 199         { .name = MT_CLS_DUAL_INRANGE_CONTACTID,
 200                 .quirks = MT_QUIRK_VALID_IS_INRANGE |
 201                         MT_QUIRK_SLOT_IS_CONTACTID,
 202                 .maxcontacts = 2 },
 203         { .name = MT_CLS_DUAL_INRANGE_CONTACTNUMBER,
 204                 .quirks = MT_QUIRK_VALID_IS_INRANGE |
 205                         MT_QUIRK_SLOT_IS_CONTACTNUMBER,
 206                 .maxcontacts = 2 },
 207         { .name = MT_CLS_INRANGE_CONTACTNUMBER,
 208                 .quirks = MT_QUIRK_VALID_IS_INRANGE |
 209                         MT_QUIRK_SLOT_IS_CONTACTNUMBER },
 210         { .name = MT_CLS_WIN_8,
 211                 .quirks = MT_QUIRK_ALWAYS_VALID |
 212                         MT_QUIRK_IGNORE_DUPLICATES |
 213                         MT_QUIRK_HOVERING |
 214                         MT_QUIRK_CONTACT_CNT_ACCURATE },
 215         { .name = MT_CLS_EXPORT_ALL_INPUTS,
 216                 .quirks = MT_QUIRK_ALWAYS_VALID |
 217                         MT_QUIRK_CONTACT_CNT_ACCURATE,
 218                 .export_all_inputs = true },
 219
 220         /*
 221          * vendor specific classes
 222          */
 223         { .name = MT_CLS_3M,
 224                 .quirks = MT_QUIRK_VALID_IS_CONFIDENCE |
 225                         MT_QUIRK_SLOT_IS_CONTACTID,
 226                 .sn_move = 2048,
 227                 .sn_width = 128,
 228                 .sn_height = 128,
 229                 .maxcontacts = 60,
 230         },
 231         { .name = MT_CLS_EGALAX,
 232                 .quirks =  MT_QUIRK_SLOT_IS_CONTACTID |
 233                         MT_QUIRK_VALID_IS_INRANGE,
 234                 .sn_move = 4096,
 235                 .sn_pressure = 32,
 236         },
 237         { .name = MT_CLS_EGALAX_SERIAL,
 238                 .quirks =  MT_QUIRK_SLOT_IS_CONTACTID |
 239                         MT_QUIRK_ALWAYS_VALID,
 240                 .sn_move = 4096,
 241                 .sn_pressure = 32,
 242         },
 243         { .name = MT_CLS_TOPSEED,
 244                 .quirks = MT_QUIRK_ALWAYS_VALID,
 245                 .is_indirect = true,
 246                 .maxcontacts = 2,
 247         },
 248         { .name = MT_CLS_PANASONIC,
 249                 .quirks = MT_QUIRK_NOT_SEEN_MEANS_UP,
 250                 .maxcontacts = 4 },
 251         { .name = MT_CLS_GENERALTOUCH_TWOFINGERS,
 252                 .quirks = MT_QUIRK_NOT_SEEN_MEANS_UP |
 253                         MT_QUIRK_VALID_IS_INRANGE |
 254                         MT_QUIRK_SLOT_IS_CONTACTID,
 255                 .maxcontacts = 2
 256         },
 257         { .name = MT_CLS_GENERALTOUCH_PWT_TENFINGERS,
 258                 .quirks = MT_QUIRK_NOT_SEEN_MEANS_UP |
 259                         MT_QUIRK_SLOT_IS_CONTACTID
 260         },
 261
 262         { .name = MT_CLS_FLATFROG,
 263                 .quirks = MT_QUIRK_NOT_SEEN_MEANS_UP |
 264                         MT_QUIRK_NO_AREA,
 265                 .sn_move = 2048,
 266                 .maxcontacts = 40,
 267         },
 268         { .name = MT_CLS_LG,
 269                 .quirks = MT_QUIRK_ALWAYS_VALID |
 270                         MT_QUIRK_FIX_CONST_CONTACT_ID |
 271                         MT_QUIRK_IGNORE_DUPLICATES |
 272                         MT_QUIRK_HOVERING |
 273                         MT_QUIRK_CONTACT_CNT_ACCURATE },
 274         { .name = MT_CLS_VTL,
 275                 .quirks = MT_QUIRK_ALWAYS_VALID |
 276                         MT_QUIRK_CONTACT_CNT_ACCURATE |
 277                         MT_QUIRK_FORCE_GET_FEATURE,
 278         },
 279         { }
 280 };
 281
 282 static ssize_t mt_show_quirks(struct device *dev,
 283                            struct device_attribute *attr,
 284                            char *buf)
 285 {
 286         struct hid_device *hdev = to_hid_device(dev);
 287         struct mt_device *td = hid_get_drvdata(hdev);
 288
 289         return sprintf(buf, "%u\n", td->mtclass.quirks);
 290 }
 291
 292 static ssize_t mt_set_quirks(struct device *dev,
 293                           struct device_attribute *attr,
 294                           const char *buf, size_t count)
 295 {
 296         struct hid_device *hdev = to_hid_device(dev);
 297         struct mt_device *td = hid_get_drvdata(hdev);
 298
 299         unsigned long val;
 300
 301         if (kstrtoul(buf, 0, &val))
 302                 return -EINVAL;
 303
 304         td->mtclass.quirks = val;
 305
 306         if (td->cc_index < 0)
 307                 td->mtclass.quirks &= ~MT_QUIRK_CONTACT_CNT_ACCURATE;
 308
 309         return count;
 310 }
 311
 312 static DEVICE_ATTR(quirks, S_IWUSR | S_IRUGO, mt_show_quirks, mt_set_quirks);
 313
 314 static struct attribute *sysfs_attrs[] = {
 315         &dev_attr_quirks.attr,
 316         NULL
 317 };
 318
 319 static struct attribute_group mt_attribute_group = {
 320         .attrs = sysfs_attrs
 321 };
 322
 323 static void mt_get_feature(struct hid_device *hdev, struct hid_report *report)
 324 {
 325         struct mt_device *td = hid_get_drvdata(hdev);
 326         int ret, size = hid_report_len(report);
 327         u8 *buf;
 328
 329         /*
 330          * Do not fetch the feature report if the device has been explicitly
 331          * marked as non-capable.
 332          */
 333         if (td->initial_quirks & HID_QUIRK_NO_INIT_REPORTS)
 334                 return;
 335
 336         buf = hid_alloc_report_buf(report, GFP_KERNEL);
 337         if (!buf)
 338                 return;
 339
 340         ret = hid_hw_raw_request(hdev, report->id, buf, size,
 341                                  HID_FEATURE_REPORT, HID_REQ_GET_REPORT);
 342         if (ret < 0) {
 343                 dev_warn(&hdev->dev, "failed to fetch feature %d\n",
 344                          report->id);
 345         } else {
 346                 ret = hid_report_raw_event(hdev, HID_FEATURE_REPORT, buf,
 347                                            size, 0);
 348                 if (ret)
 349                         dev_warn(&hdev->dev, "failed to report feature\n");
 350         }
 351
 352         kfree(buf);
 353 }
 354
 355 static void mt_feature_mapping(struct hid_device *hdev,
 356                 struct hid_field *field, struct hid_usage *usage)
 357 {
 358         struct mt_device *td = hid_get_drvdata(hdev);
 359
 360         switch (usage->hid) {
 361         case HID_DG_INPUTMODE:
 362                 /* Ignore if value index is out of bounds. */
 363                 if (usage->usage_index >= field->report_count) {
 364                         dev_err(&hdev->dev, "HID_DG_INPUTMODE out of range\n");
 365                         break;
 366                 }
 367
 368                 if (td->inputmode < 0) {
 369                         td->inputmode = field->report->id;
 370                         td->inputmode_index = usage->usage_index;
 371                 } else {
 372                         /*
 373                          * Some elan panels wrongly declare 2 input mode
 374                          * features, and silently ignore when we set the
 375                          * value in the second field. Skip the second feature
 376                          * and hope for the best.
 377                          */
 378                         dev_info(&hdev->dev,
 379                                  "Ignoring the extra HID_DG_INPUTMODE\n");
 380                 }
 381
 382                 break;
 383         case HID_DG_CONTACTMAX:
 384                 mt_get_feature(hdev, field->report);
 385
 386                 td->maxcontact_report_id = field->report->id;
 387                 td->maxcontacts = field->value[0];
 388                 if (!td->maxcontacts &&
 389                     field->logical_maximum <= MT_MAX_MAXCONTACT)
 390                         td->maxcontacts = field->logical_maximum;
 391                 if (td->mtclass.maxcontacts)
 392                         /* check if the maxcontacts is given by the class */
 393                         td->maxcontacts = td->mtclass.maxcontacts;
 394
 395                 break;
 396         case HID_DG_BUTTONTYPE:
 397                 if (usage->usage_index >= field->report_count) {
 398                         dev_err(&hdev->dev, "HID_DG_BUTTONTYPE out of range\n");
 399                         break;
 400                 }
 401
 402                 mt_get_feature(hdev, field->report);
 403                 if (field->value[usage->usage_index] == MT_BUTTONTYPE_CLICKPAD)
 404                         td->is_buttonpad = true;
 405
 406                 break;
 407         case 0xff0000c5:
 408                 /* Retrieve the Win8 blob once to enable some devices */
 409                 if (usage->usage_index == 0)
 410                         mt_get_feature(hdev, field->report);
 411                 break;
 412         }
 413 }
 414
 415 static void set_abs(struct input_dev *input, unsigned int code,
 416                 struct hid_field *field, int snratio)
 417 {
 418         int fmin = field->logical_minimum;
 419         int fmax = field->logical_maximum;
 420         int fuzz = snratio ? (fmax - fmin) / snratio : 0;
 421         input_set_abs_params(input, code, fmin, fmax, fuzz, 0);
 422         input_abs_set_res(input, code, hidinput_calc_abs_res(field, code));
 423 }
 424
 425 static void mt_store_field(struct hid_usage *usage, struct mt_device *td,
 426                 struct hid_input *hi)
 427 {
 428         struct mt_fields *f = td->fields;
 429
 430         if (f->length >= HID_MAX_FIELDS)
 431                 return;
 432
 433         f->usages[f->length++] = usage->hid;
 434 }
 435
 436 static int mt_touch_input_mapping(struct hid_device *hdev, struct hid_input *hi,
 437                 struct hid_field *field, struct hid_usage *usage,
 438                 unsigned long **bit, int *max)
 439 {
 440         struct mt_device *td = hid_get_drvdata(hdev);
 441         struct mt_class *cls = &td->mtclass;
 442         int code;
 443         struct hid_usage *prev_usage = NULL;
 444
 445         if (field->application == HID_DG_TOUCHSCREEN)
 446                 td->mt_flags |= INPUT_MT_DIRECT;
 447
 448         /*
 449          * Model touchscreens providing buttons as touchpads.
 450          */
 451         if (field->application == HID_DG_TOUCHPAD ||
 452             (usage->hid & HID_USAGE_PAGE) == HID_UP_BUTTON) {
 453                 td->mt_flags |= INPUT_MT_POINTER;
 454                 td->inputmode_value = MT_INPUTMODE_TOUCHPAD;
 455         }
 456
 457         /* count the buttons on touchpads */
 458         if ((usage->hid & HID_USAGE_PAGE) == HID_UP_BUTTON)
 459                 td->buttons_count++;
 460
 461         if (usage->usage_index)
 462                 prev_usage = &field->usage[usage->usage_index - 1];
 463
 464         switch (usage->hid & HID_USAGE_PAGE) {
 465
 466         case HID_UP_GENDESK:
 467                 switch (usage->hid) {
 468                 case HID_GD_X:
 469                         if (prev_usage && (prev_usage->hid == usage->hid)) {
 470                                 hid_map_usage(hi, usage, bit, max,
 471                                         EV_ABS, ABS_MT_TOOL_X);
 472                                 set_abs(hi->input, ABS_MT_TOOL_X, field,
 473                                         cls->sn_move);
 474                         } else {
 475                                 hid_map_usage(hi, usage, bit, max,
 476                                         EV_ABS, ABS_MT_POSITION_X);
 477                                 set_abs(hi->input, ABS_MT_POSITION_X, field,
 478                                         cls->sn_move);
 479                         }
 480
 481                         mt_store_field(usage, td, hi);
 482                         return 1;
 483                 case HID_GD_Y:
 484                         if (prev_usage && (prev_usage->hid == usage->hid)) {
 485                                 hid_map_usage(hi, usage, bit, max,
 486                                         EV_ABS, ABS_MT_TOOL_Y);
 487                                 set_abs(hi->input, ABS_MT_TOOL_Y, field,
 488                                         cls->sn_move);
 489                         } else {
 490                                 hid_map_usage(hi, usage, bit, max,
 491                                         EV_ABS, ABS_MT_POSITION_Y);
 492                                 set_abs(hi->input, ABS_MT_POSITION_Y, field,
 493                                         cls->sn_move);
 494                         }
 495
 496                         mt_store_field(usage, td, hi);
 497                         return 1;
 498                 }
 499                 return 0;
 500
 501         case HID_UP_DIGITIZER:
 502                 switch (usage->hid) {
 503                 case HID_DG_INRANGE:
 504                         if (cls->quirks & MT_QUIRK_HOVERING) {
 505                                 hid_map_usage(hi, usage, bit, max,
 506                                         EV_ABS, ABS_MT_DISTANCE);
 507                                 input_set_abs_params(hi->input,
 508                                         ABS_MT_DISTANCE, 0, 1, 0, 0);
 509                         }
 510                         mt_store_field(usage, td, hi);
 511                         return 1;
 512                 case HID_DG_CONFIDENCE:
 513                         if (cls->name == MT_CLS_WIN_8 &&
 514                                 field->application == HID_DG_TOUCHPAD)
 515                                 cls->quirks |= MT_QUIRK_CONFIDENCE;
 516                         mt_store_field(usage, td, hi);
 517                         return 1;
 518                 case HID_DG_TIPSWITCH:
 519                         hid_map_usage(hi, usage, bit, max, EV_KEY, BTN_TOUCH);
 520                         input_set_capability(hi->input, EV_KEY, BTN_TOUCH);
 521                         mt_store_field(usage, td, hi);
 522                         return 1;
 523                 case HID_DG_CONTACTID:
 524                         mt_store_field(usage, td, hi);
 525                         td->touches_by_report++;
 526                         td->mt_report_id = field->report->id;
 527                         return 1;
 528                 case HID_DG_WIDTH:
 529                         hid_map_usage(hi, usage, bit, max,
 530                                         EV_ABS, ABS_MT_TOUCH_MAJOR);
 531                         if (!(cls->quirks & MT_QUIRK_NO_AREA))
 532                                 set_abs(hi->input, ABS_MT_TOUCH_MAJOR, field,
 533                                         cls->sn_width);
 534                         mt_store_field(usage, td, hi);
 535                         return 1;
 536                 case HID_DG_HEIGHT:
 537                         hid_map_usage(hi, usage, bit, max,
 538                                         EV_ABS, ABS_MT_TOUCH_MINOR);
 539                         if (!(cls->quirks & MT_QUIRK_NO_AREA)) {
 540                                 set_abs(hi->input, ABS_MT_TOUCH_MINOR, field,
 541                                         cls->sn_height);
 542                                 input_set_abs_params(hi->input,
 543                                         ABS_MT_ORIENTATION, 0, 1, 0, 0);
 544                         }
 545                         mt_store_field(usage, td, hi);
 546                         return 1;
 547                 case HID_DG_TIPPRESSURE:
 548                         hid_map_usage(hi, usage, bit, max,
 549                                         EV_ABS, ABS_MT_PRESSURE);
 550                         set_abs(hi->input, ABS_MT_PRESSURE, field,
 551                                 cls->sn_pressure);
 552                         mt_store_field(usage, td, hi);
 553                         return 1;
 554                 case HID_DG_CONTACTCOUNT:
 555                         /* Ignore if indexes are out of bounds. */
 556                         if (field->index >= field->report->maxfield ||
 557                             usage->usage_index >= field->report_count)
 558                                 return 1;
 559                         td->cc_index = field->index;
 560                         td->cc_value_index = usage->usage_index;
 561                         return 1;
 562                 case HID_DG_CONTACTMAX:
 563                         /* we don't set td->last_slot_field as contactcount and
 564                          * contact max are global to the report */
 565                         return -1;
 566                 case HID_DG_TOUCH:
 567                         /* Legacy devices use TIPSWITCH and not TOUCH.
 568                          * Let's just ignore this field. */
 569                         return -1;
 570                 }
 571                 /* let hid-input decide for the others */
 572                 return 0;
 573
 574         case HID_UP_BUTTON:
 575                 code = BTN_MOUSE + ((usage->hid - 1) & HID_USAGE);
 576                 /*
 577                  * MS PTP spec says that external buttons left and right have
 578                  * usages 2 and 3.
 579                  */
 580                 if (cls->name == MT_CLS_WIN_8 &&
 581                     field->application == HID_DG_TOUCHPAD &&
 582                     (usage->hid & HID_USAGE) > 1)
 583                         code--;
 584                 hid_map_usage(hi, usage, bit, max, EV_KEY, code);
 585                 input_set_capability(hi->input, EV_KEY, code);
 586                 return 1;
 587
 588         case 0xff000000:
 589                 /* we do not want to map these: no input-oriented meaning */
 590                 return -1;
 591         }
 592
 593         return 0;
 594 }
 595
 596 static int mt_touch_input_mapped(struct hid_device *hdev, struct hid_input *hi,
 597                 struct hid_field *field, struct hid_usage *usage,
 598                 unsigned long **bit, int *max)
 599 {
 600         if (usage->type == EV_KEY || usage->type == EV_ABS)
 601                 set_bit(usage->type, hi->input->evbit);
 602
 603         return -1;
 604 }
 605
 606 static int mt_compute_slot(struct mt_device *td, struct input_dev *input)
 607 {
 608         __s32 quirks = td->mtclass.quirks;
 609
 610         if (quirks & MT_QUIRK_SLOT_IS_CONTACTID)
 611                 return td->curdata.contactid;
 612
 613         if (quirks & MT_QUIRK_CYPRESS)
 614                 return cypress_compute_slot(td);
 615
 616         if (quirks & MT_QUIRK_SLOT_IS_CONTACTNUMBER)
 617                 return td->num_received;
 618
 619         if (quirks & MT_QUIRK_SLOT_IS_CONTACTID_MINUS_ONE)
 620                 return td->curdata.contactid - 1;
 621
 622         return input_mt_get_slot_by_key(input, td->curdata.contactid);
 623 }
 624
 625 /*
 626  * this function is called when a whole contact has been processed,
 627  * so that it can assign it to a slot and store the data there
 628  */
 629 static void mt_complete_slot(struct mt_device *td, struct input_dev *input)
 630 {
 631         if ((td->mtclass.quirks & MT_QUIRK_CONTACT_CNT_ACCURATE) &&
 632             td->num_received >= td->num_expected)
 633                 return;
 634
 635         if (td->curvalid || (td->mtclass.quirks & MT_QUIRK_ALWAYS_VALID)) {
 636                 int active;
 637                 int slotnum = mt_compute_slot(td, input);
 638                 struct mt_slot *s = &td->curdata;
 639                 struct input_mt *mt = input->mt;
 640
 641                 if (slotnum < 0 || slotnum >= td->maxcontacts)
 642                         return;
 643
 644                 if ((td->mtclass.quirks & MT_QUIRK_IGNORE_DUPLICATES) && mt) {
 645                         struct input_mt_slot *slot = &mt->slots[slotnum];
 646                         if (input_mt_is_active(slot) &&
 647                             input_mt_is_used(mt, slot))
 648                                 return;
 649                 }
 650
 651                 if (!(td->mtclass.quirks & MT_QUIRK_CONFIDENCE))
 652                         s->confidence_state = 1;
 653                 active = (s->touch_state || s->inrange_state) &&
 654                                                         s->confidence_state;
 655
 656                 input_mt_slot(input, slotnum);
 657                 input_mt_report_slot_state(input, MT_TOOL_FINGER, active);
 658                 if (active) {
 659                         /* this finger is in proximity of the sensor */
 660                         int wide = (s->w > s->h);
 661                         /* divided by two to match visual scale of touch */
 662                         int major = max(s->w, s->h) >> 1;
 663                         int minor = min(s->w, s->h) >> 1;
 664
 665                         input_event(input, EV_ABS, ABS_MT_POSITION_X, s->x);
 666                         input_event(input, EV_ABS, ABS_MT_POSITION_Y, s->y);
 667                         input_event(input, EV_ABS, ABS_MT_TOOL_X, s->cx);
 668                         input_event(input, EV_ABS, ABS_MT_TOOL_Y, s->cy);
 669                         input_event(input, EV_ABS, ABS_MT_DISTANCE,
 670                                 !s->touch_state);
 671                         input_event(input, EV_ABS, ABS_MT_ORIENTATION, wide);
 672                         input_event(input, EV_ABS, ABS_MT_PRESSURE, s->p);
 673                         input_event(input, EV_ABS, ABS_MT_TOUCH_MAJOR, major);
 674                         input_event(input, EV_ABS, ABS_MT_TOUCH_MINOR, minor);
 675                 }
 676         }
 677
 678         td->num_received++;
 679 }
 680
 681 /*
 682  * this function is called when a whole packet has been received and processed,
 683  * so that it can decide what to send to the input layer.
 684  */
 685 static void mt_sync_frame(struct mt_device *td, struct input_dev *input)
 686 {
 687         input_mt_sync_frame(input);
 688         input_sync(input);
 689         td->num_received = 0;
 690 }
 691
 692 static int mt_touch_event(struct hid_device *hid, struct hid_field *field,
 693                                 struct hid_usage *usage, __s32 value)
 694 {
 695         /* we will handle the hidinput part later, now remains hiddev */
 696         if (hid->claimed & HID_CLAIMED_HIDDEV && hid->hiddev_hid_event)
 697                 hid->hiddev_hid_event(hid, field, usage, value);
 698
 699         return 1;
 700 }
 701
 702 static void mt_process_mt_event(struct hid_device *hid, struct hid_field *field,
 703                                 struct hid_usage *usage, __s32 value)
 704 {
 705         struct mt_device *td = hid_get_drvdata(hid);
 706         __s32 quirks = td->mtclass.quirks;
 707         struct input_dev *input = field->hidinput->input;
 708
 709         if (hid->claimed & HID_CLAIMED_INPUT) {
 710                 switch (usage->hid) {
 711                 case HID_DG_INRANGE:
 712                         if (quirks & MT_QUIRK_VALID_IS_INRANGE)
 713                                 td->curvalid = value;
 714                         if (quirks & MT_QUIRK_HOVERING)
 715                                 td->curdata.inrange_state = value;
 716                         break;
 717                 case HID_DG_TIPSWITCH:
 718                         if (quirks & MT_QUIRK_NOT_SEEN_MEANS_UP)
 719                                 td->curvalid = value;
 720                         td->curdata.touch_state = value;
 721                         break;
 722                 case HID_DG_CONFIDENCE:
 723                         if (quirks & MT_QUIRK_CONFIDENCE)
 724                                 td->curdata.confidence_state = value;
 725                         if (quirks & MT_QUIRK_VALID_IS_CONFIDENCE)
 726                                 td->curvalid = value;
 727                         break;
 728                 case HID_DG_CONTACTID:
 729                         td->curdata.contactid = value;
 730                         break;
 731                 case HID_DG_TIPPRESSURE:
 732                         td->curdata.p = value;
 733                         break;
 734                 case HID_GD_X:
 735                         if (usage->code == ABS_MT_TOOL_X)
 736                                 td->curdata.cx = value;
 737                         else
 738                                 td->curdata.x = value;
 739                         break;
 740                 case HID_GD_Y:
 741                         if (usage->code == ABS_MT_TOOL_Y)
 742                                 td->curdata.cy = value;
 743                         else
 744                                 td->curdata.y = value;
 745                         break;
 746                 case HID_DG_WIDTH:
 747                         td->curdata.w = value;
 748                         break;
 749                 case HID_DG_HEIGHT:
 750                         td->curdata.h = value;
 751                         break;
 752                 case HID_DG_CONTACTCOUNT:
 753                         break;
 754                 case HID_DG_TOUCH:
 755                         /* do nothing */
 756                         break;
 757
 758                 default:
 759                         if (usage->type)
 760                                 input_event(input, usage->type, usage->code,
 761                                                 value);
 762                         return;
 763                 }
 764
 765                 if (usage->usage_index + 1 == field->report_count) {
 766                         /* we only take into account the last report. */
 767                         if (usage->hid == td->last_slot_field)
 768                                 mt_complete_slot(td, field->hidinput->input);
 769                 }
 770
 771         }
 772 }
 773
 774 static void mt_touch_report(struct hid_device *hid, struct hid_report *report)
 775 {
 776         struct mt_device *td = hid_get_drvdata(hid);
 777         struct hid_field *field;
 778         unsigned count;
 779         int r, n;
 780
 781         /*
 782          * Includes multi-packet support where subsequent
 783          * packets are sent with zero contactcount.
 784          */
 785         if (td->cc_index >= 0) {
 786                 struct hid_field *field = report->field[td->cc_index];
 787                 int value = field->value[td->cc_value_index];
 788                 if (value)
 789                         td->num_expected = value;
 790         }
 791
 792         for (r = 0; r < report->maxfield; r++) {
 793                 field = report->field[r];
 794                 count = field->report_count;
 795
 796                 if (!(HID_MAIN_ITEM_VARIABLE & field->flags))
 797                         continue;
 798
 799                 for (n = 0; n < count; n++)
 800                         mt_process_mt_event(hid, field, &field->usage[n],
 801                                         field->value[n]);
 802         }
 803
 804         if (td->num_received >= td->num_expected)
 805                 mt_sync_frame(td, report->field[0]->hidinput->input);
 806 }
 807
 808 static int mt_touch_input_configured(struct hid_device *hdev,
 809                                         struct hid_input *hi)
 810 {
 811         struct mt_device *td = hid_get_drvdata(hdev);
 812         struct mt_class *cls = &td->mtclass;
 813         struct input_dev *input = hi->input;
 814         int ret;
 815
 816         if (!td->maxcontacts)
 817                 td->maxcontacts = MT_DEFAULT_MAXCONTACT;
 818
 819         mt_post_parse(td);
 820         if (td->serial_maybe)
 821                 mt_post_parse_default_settings(td);
 822
 823         if (cls->is_indirect)
 824                 td->mt_flags |= INPUT_MT_POINTER;
 825
 826         if (cls->quirks & MT_QUIRK_NOT_SEEN_MEANS_UP)
 827                 td->mt_flags |= INPUT_MT_DROP_UNUSED;
 828
 829         /* check for clickpads */
 830         if ((td->mt_flags & INPUT_MT_POINTER) && (td->buttons_count == 1))
 831                 td->is_buttonpad = true;
 832
 833         if (td->is_buttonpad)
 834                 __set_bit(INPUT_PROP_BUTTONPAD, input->propbit);
 835
 836         ret = input_mt_init_slots(input, td->maxcontacts, td->mt_flags);
 837         if (ret)
 838                 return ret;
 839
 840         td->mt_flags = 0;
 841         return 0;
 842 }
 843
 844 static int mt_input_mapping(struct hid_device *hdev, struct hid_input *hi,
 845                 struct hid_field *field, struct hid_usage *usage,
 846                 unsigned long **bit, int *max)
 847 {
 848         struct mt_device *td = hid_get_drvdata(hdev);
 849
 850         /*
 851          * If mtclass.export_all_inputs is not set, only map fields from
 852          * TouchScreen or TouchPad collections. We need to ignore fields
 853          * that belong to other collections such as Mouse that might have
 854          * the same GenericDesktop usages.
 855          */
 856         if (!td->mtclass.export_all_inputs &&
 857             field->application != HID_DG_TOUCHSCREEN &&
 858             field->application != HID_DG_PEN &&
 859             field->application != HID_DG_TOUCHPAD &&
 860             field->application != HID_GD_KEYBOARD &&
 861             field->application != HID_CP_CONSUMER_CONTROL)
 862                 return -1;
 863
 864         /*
 865          * some egalax touchscreens have "application == HID_DG_TOUCHSCREEN"
 866          * for the stylus.
 867          * The check for mt_report_id ensures we don't process
 868          * HID_DG_CONTACTCOUNT from the pen report as it is outside the physical
 869          * collection, but within the report ID.
 870          */
 871         if (field->physical == HID_DG_STYLUS)
 872                 return 0;
 873         else if ((field->physical == 0) &&
 874                  (field->report->id != td->mt_report_id) &&
 875                  (td->mt_report_id != -1))
 876                 return 0;
 877
 878         if (field->application == HID_DG_TOUCHSCREEN ||
 879             field->application == HID_DG_TOUCHPAD)
 880                 return mt_touch_input_mapping(hdev, hi, field, usage, bit, max);
 881
 882         /* let hid-core decide for the others */
 883         return 0;
 884 }
 885
 886 static int mt_input_mapped(struct hid_device *hdev, struct hid_input *hi,
 887                 struct hid_field *field, struct hid_usage *usage,
 888                 unsigned long **bit, int *max)
 889 {
 890         /*
 891          * some egalax touchscreens have "application == HID_DG_TOUCHSCREEN"
 892          * for the stylus.
 893          */
 894         if (field->physical == HID_DG_STYLUS)
 895                 return 0;
 896
 897         if (field->application == HID_DG_TOUCHSCREEN ||
 898             field->application == HID_DG_TOUCHPAD)
 899                 return mt_touch_input_mapped(hdev, hi, field, usage, bit, max);
 900
 901         /* let hid-core decide for the others */
 902         return 0;
 903 }
 904
 905 static int mt_event(struct hid_device *hid, struct hid_field *field,
 906                                 struct hid_usage *usage, __s32 value)
 907 {
 908         struct mt_device *td = hid_get_drvdata(hid);
 909
 910         if (field->report->id == td->mt_report_id)
 911                 return mt_touch_event(hid, field, usage, value);
 912
 913         return 0;
 914 }
 915
 916 static void mt_report(struct hid_device *hid, struct hid_report *report)
 917 {
 918         struct mt_device *td = hid_get_drvdata(hid);
 919         struct hid_field *field = report->field[0];
 920
 921         if (!(hid->claimed & HID_CLAIMED_INPUT))
 922                 return;
 923
 924         if (report->id == td->mt_report_id)
 925                 return mt_touch_report(hid, report);
 926
 927         if (field && field->hidinput && field->hidinput->input)
 928                 input_sync(field->hidinput->input);
 929 }
 930
 931 static void mt_set_input_mode(struct hid_device *hdev)
 932 {
 933         struct mt_device *td = hid_get_drvdata(hdev);
 934         struct hid_report *r;
 935         struct hid_report_enum *re;
 936         struct mt_class *cls = &td->mtclass;
 937         char *buf;
 938         int report_len;
 939
 940         if (td->inputmode < 0)
 941                 return;
 942
 943         re = &(hdev->report_enum[HID_FEATURE_REPORT]);
 944         r = re->report_id_hash[td->inputmode];
 945         if (r) {
 946                 if (cls->quirks & MT_QUIRK_FORCE_GET_FEATURE) {
 947                         report_len = hid_report_len(r);
 948                         buf = hid_alloc_report_buf(r, GFP_KERNEL);
 949                         if (!buf) {
 950                                 hid_err(hdev, "failed to allocate buffer for report\n");
 951                                 return;
 952                         }
 953                         hid_hw_raw_request(hdev, r->id, buf, report_len,
 954                                            HID_FEATURE_REPORT,
 955                                            HID_REQ_GET_REPORT);
 956                         kfree(buf);
 957                 }
 958                 r->field[0]->value[td->inputmode_index] = td->inputmode_value;
 959                 hid_hw_request(hdev, r, HID_REQ_SET_REPORT);
 960         }
 961 }
 962
 963 static void mt_set_maxcontacts(struct hid_device *hdev)
 964 {
 965         struct mt_device *td = hid_get_drvdata(hdev);
 966         struct hid_report *r;
 967         struct hid_report_enum *re;
 968         int fieldmax, max;
 969
 970         if (td->maxcontact_report_id < 0)
 971                 return;
 972
 973         if (!td->mtclass.maxcontacts)
 974                 return;
 975
 976         re = &hdev->report_enum[HID_FEATURE_REPORT];
 977         r = re->report_id_hash[td->maxcontact_report_id];
 978         if (r) {
 979                 max = td->mtclass.maxcontacts;
 980                 fieldmax = r->field[0]->logical_maximum;
 981                 max = min(fieldmax, max);
 982                 if (r->field[0]->value[0] != max) {
 983                         r->field[0]->value[0] = max;
 984                         hid_hw_request(hdev, r, HID_REQ_SET_REPORT);
 985                 }
 986         }
 987 }
 988
 989 static void mt_post_parse_default_settings(struct mt_device *td)
 990 {
 991         __s32 quirks = td->mtclass.quirks;
 992
 993         /* unknown serial device needs special quirks */
 994         if (td->touches_by_report == 1) {
 995                 quirks |= MT_QUIRK_ALWAYS_VALID;
 996                 quirks &= ~MT_QUIRK_NOT_SEEN_MEANS_UP;
 997                 quirks &= ~MT_QUIRK_VALID_IS_INRANGE;
 998                 quirks &= ~MT_QUIRK_VALID_IS_CONFIDENCE;
 999                 quirks &= ~MT_QUIRK_CONTACT_CNT_ACCURATE;
1000         }
1001
1002         td->mtclass.quirks = quirks;
1003 }
1004
1005 static void mt_post_parse(struct mt_device *td)
1006 {
1007         struct mt_fields *f = td->fields;
1008         struct mt_class *cls = &td->mtclass;
1009
1010         if (td->touches_by_report > 0) {
1011                 int field_count_per_touch = f->length / td->touches_by_report;
1012                 td->last_slot_field = f->usages[field_count_per_touch - 1];
1013         }
1014
1015         if (td->cc_index < 0)
1016                 cls->quirks &= ~MT_QUIRK_CONTACT_CNT_ACCURATE;
1017 }
1018
1019 static int mt_input_configured(struct hid_device *hdev, struct hid_input *hi)
1020 {
1021         struct mt_device *td = hid_get_drvdata(hdev);
1022         char *name;
1023         const char *suffix = NULL;
1024         struct hid_field *field = hi->report->field[0];
1025         int ret;
1026
1027         if (hi->report->id == td->mt_report_id) {
1028                 ret = mt_touch_input_configured(hdev, hi);
1029                 if (ret)
1030                         return ret;
1031         }
1032
1033         /*
1034          * some egalax touchscreens have "application == HID_DG_TOUCHSCREEN"
1035          * for the stylus. Check this first, and then rely on the application
1036          * field.
1037          */
1038         if (hi->report->field[0]->physical == HID_DG_STYLUS) {
1039                 suffix = "Pen";
1040                 /* force BTN_STYLUS to allow tablet matching in udev */
1041                 __set_bit(BTN_STYLUS, hi->input->keybit);
1042         } else {
1043                 switch (field->application) {
1044                 case HID_GD_KEYBOARD:
1045                         suffix = "Keyboard";
1046                         break;
1047                 case HID_GD_KEYPAD:
1048                         suffix = "Keypad";
1049                         break;
1050                 case HID_GD_MOUSE:
1051                         suffix = "Mouse";
1052                         break;
1053                 case HID_DG_STYLUS:
1054                         suffix = "Pen";
1055                         /* force BTN_STYLUS to allow tablet matching in udev */
1056                         __set_bit(BTN_STYLUS, hi->input->keybit);
1057                         break;
1058                 case HID_DG_TOUCHSCREEN:
1059                         /* we do not set suffix = "Touchscreen" */
1060                         break;
1061                 case HID_DG_TOUCHPAD:
1062                         suffix = "Touchpad";
1063                         break;
1064                 case HID_GD_SYSTEM_CONTROL:
1065                         suffix = "System Control";
1066                         break;
1067                 case HID_CP_CONSUMER_CONTROL:
1068                         suffix = "Consumer Control";
1069                         break;
1070                 default:
1071                         suffix = "UNKNOWN";
1072                         break;
1073                 }
1074         }
1075
1076         if (suffix) {
1077                 name = devm_kzalloc(&hi->input->dev,
1078                                     strlen(hdev->name) + strlen(suffix) + 2,
1079                                     GFP_KERNEL);
1080                 if (name) {
1081                         sprintf(name, "%s %s", hdev->name, suffix);
1082                         hi->input->name = name;
1083                 }
1084         }
1085
1086         return 0;
1087 }
1088
1089 static void mt_fix_const_field(struct hid_field *field, unsigned int usage)
1090 {
1091         if (field->usage[0].hid != usage ||
1092             !(field->flags & HID_MAIN_ITEM_CONSTANT))
1093                 return;
1094
1095         field->flags &= ~HID_MAIN_ITEM_CONSTANT;
1096         field->flags |= HID_MAIN_ITEM_VARIABLE;
1097 }
1098
1099 static void mt_fix_const_fields(struct hid_device *hdev, unsigned int usage)
1100 {
1101         struct hid_report *report;
1102         int i;
1103
1104         list_for_each_entry(report,
1105                             &hdev->report_enum[HID_INPUT_REPORT].report_list,
1106                             list) {
1107
1108                 if (!report->maxfield)
1109                         continue;
1110
1111                 for (i = 0; i < report->maxfield; i++)
1112                         if (report->field[i]->maxusage >= 1)
1113                                 mt_fix_const_field(report->field[i], usage);
1114         }
1115 }
1116
1117 static int mt_probe(struct hid_device *hdev, const struct hid_device_id *id)
1118 {
1119         int ret, i;
1120         struct mt_device *td;
1121         struct mt_class *mtclass = mt_classes; /* MT_CLS_DEFAULT */
1122
1123         for (i = 0; mt_classes[i].name ; i++) {
1124                 if (id->driver_data == mt_classes[i].name) {
1125                         mtclass = &(mt_classes[i]);
1126                         break;
1127                 }
1128         }
1129
1130         td = devm_kzalloc(&hdev->dev, sizeof(struct mt_device), GFP_KERNEL);
1131         if (!td) {
1132                 dev_err(&hdev->dev, "cannot allocate multitouch data\n");
1133                 return -ENOMEM;
1134         }
1135         td->mtclass = *mtclass;
1136         td->inputmode = -1;
1137         td->maxcontact_report_id = -1;
1138         td->inputmode_value = MT_INPUTMODE_TOUCHSCREEN;
1139         td->cc_index = -1;
1140         td->mt_report_id = -1;
1141         hid_set_drvdata(hdev, td);
1142
1143         td->fields = devm_kzalloc(&hdev->dev, sizeof(struct mt_fields),
1144                                   GFP_KERNEL);
1145         if (!td->fields) {
1146                 dev_err(&hdev->dev, "cannot allocate multitouch fields data\n");
1147                 return -ENOMEM;
1148         }
1149
1150         if (id->vendor == HID_ANY_ID && id->product == HID_ANY_ID)
1151                 td->serial_maybe = true;
1152
1153         /*
1154          * Store the initial quirk state
1155          */
1156         td->initial_quirks = hdev->quirks;
1157
1158         /* This allows the driver to correctly support devices
1159          * that emit events over several HID messages.
1160          */
1161         hdev->quirks |= HID_QUIRK_NO_INPUT_SYNC;
1162
1163         /*
1164          * This allows the driver to handle different input sensors
1165          * that emits events through different reports on the same HID
1166          * device.
1167          */
1168         hdev->quirks |= HID_QUIRK_MULTI_INPUT;
1169         hdev->quirks |= HID_QUIRK_NO_EMPTY_INPUT;
1170
1171         /*
1172          * Some multitouch screens do not like to be polled for input
1173          * reports. Fortunately, the Win8 spec says that all touches
1174          * should be sent during each report, making the initialization
1175          * of input reports unnecessary. For Win7 devices, well, let's hope
1176          * they will still be happy (this is only be a problem if a touch
1177          * was already there while probing the device).
1178          *
1179          * In addition some touchpads do not behave well if we read
1180          * all feature reports from them. Instead we prevent
1181          * initial report fetching and then selectively fetch each
1182          * report we are interested in.
1183          */
1184         hdev->quirks |= HID_QUIRK_NO_INIT_REPORTS;
1185
1186         ret = hid_parse(hdev);
1187         if (ret != 0)
1188                 return ret;
1189
1190         if (mtclass->quirks & MT_QUIRK_FIX_CONST_CONTACT_ID)
1191                 mt_fix_const_fields(hdev, HID_DG_CONTACTID);
1192
1193         ret = hid_hw_start(hdev, HID_CONNECT_DEFAULT);
1194         if (ret)
1195                 return ret;
1196
1197         ret = sysfs_create_group(&hdev->dev.kobj, &mt_attribute_group);
1198         if (ret)
1199                 dev_warn(&hdev->dev, "Cannot allocate sysfs group for %s\n",
1200                                 hdev->name);
1201
1202         mt_set_maxcontacts(hdev);
1203         mt_set_input_mode(hdev);
1204
1205         /* release .fields memory as it is not used anymore */
1206         devm_kfree(&hdev->dev, td->fields);
1207         td->fields = NULL;
1208
1209         return 0;
1210 }
1211
1212 #ifdef CONFIG_PM
1213 static void mt_release_contacts(struct hid_device *hid)
1214 {
1215         struct hid_input *hidinput;
1216
1217         list_for_each_entry(hidinput, &hid->inputs, list) {
1218                 struct input_dev *input_dev = hidinput->input;
1219                 struct input_mt *mt = input_dev->mt;
1220                 int i;
1221
1222                 if (mt) {
1223                         for (i = 0; i < mt->num_slots; i++) {
1224                                 input_mt_slot(input_dev, i);
1225                                 input_mt_report_slot_state(input_dev,
1226                                                            MT_TOOL_FINGER,
1227                                                            false);
1228                         }
1229                         input_mt_sync_frame(input_dev);
1230                         input_sync(input_dev);
1231                 }
1232         }
1233 }
1234
1235 static int mt_reset_resume(struct hid_device *hdev)
1236 {
1237         mt_release_contacts(hdev);
1238         mt_set_maxcontacts(hdev);
1239         mt_set_input_mode(hdev);
1240         return 0;
1241 }
1242
1243 static int mt_resume(struct hid_device *hdev)
1244 {
1245         /* Some Elan legacy devices require SET_IDLE to be set on resume.
1246          * It should be safe to send it to other devices too.
1247          * Tested on 3M, Stantum, Cypress, Zytronic, eGalax, and Elan panels. */
1248
1249         hid_hw_idle(hdev, 0, 0, HID_REQ_SET_IDLE);
1250
1251         return 0;
1252 }
1253 #endif
1254
1255 static void mt_remove(struct hid_device *hdev)
1256 {
1257         struct mt_device *td = hid_get_drvdata(hdev);
1258
1259         sysfs_remove_group(&hdev->dev.kobj, &mt_attribute_group);
1260         hid_hw_stop(hdev);
1261         hdev->quirks = td->initial_quirks;
1262 }
1263
1264 /*
1265  * This list contains only:
1266  * - VID/PID of products not working with the default multitouch handling
1267  * - 2 generic rules.
1268  * So there is no point in adding here any device with MT_CLS_DEFAULT.
1269  */
1270 static const struct hid_device_id mt_devices[] = {
1271
1272         /* 3M panels */
1273         { .driver_data = MT_CLS_3M,
1274                 MT_USB_DEVICE(USB_VENDOR_ID_3M,
1275                         USB_DEVICE_ID_3M1968) },
1276         { .driver_data = MT_CLS_3M,
1277                 MT_USB_DEVICE(USB_VENDOR_ID_3M,
1278                         USB_DEVICE_ID_3M2256) },
1279         { .driver_data = MT_CLS_3M,
1280                 MT_USB_DEVICE(USB_VENDOR_ID_3M,
1281                         USB_DEVICE_ID_3M3266) },
1282
1283         /* Anton devices */
1284         { .driver_data = MT_CLS_EXPORT_ALL_INPUTS,
1285                 MT_USB_DEVICE(USB_VENDOR_ID_ANTON,
1286                         USB_DEVICE_ID_ANTON_TOUCH_PAD) },
1287
1288         /* Atmel panels */
1289         { .driver_data = MT_CLS_SERIAL,
1290                 MT_USB_DEVICE(USB_VENDOR_ID_ATMEL,
1291                         USB_DEVICE_ID_ATMEL_MXT_DIGITIZER) },
1292
1293         /* Baanto multitouch devices */
1294         { .driver_data = MT_CLS_NSMU,
1295                 MT_USB_DEVICE(USB_VENDOR_ID_BAANTO,
1296                         USB_DEVICE_ID_BAANTO_MT_190W2) },
1297
1298         /* Cando panels */
1299         { .driver_data = MT_CLS_DUAL_INRANGE_CONTACTNUMBER,
1300                 MT_USB_DEVICE(USB_VENDOR_ID_CANDO,
1301                         USB_DEVICE_ID_CANDO_MULTI_TOUCH) },
1302         { .driver_data = MT_CLS_DUAL_INRANGE_CONTACTNUMBER,
1303                 MT_USB_DEVICE(USB_VENDOR_ID_CANDO,
1304                         USB_DEVICE_ID_CANDO_MULTI_TOUCH_15_6) },
1305
1306         /* Chunghwa Telecom touch panels */
1307         {  .driver_data = MT_CLS_NSMU,
1308                 MT_USB_DEVICE(USB_VENDOR_ID_CHUNGHWAT,
1309                         USB_DEVICE_ID_CHUNGHWAT_MULTITOUCH) },
1310
1311         /* CJTouch panels */
1312         { .driver_data = MT_CLS_NSMU,
1313                 MT_USB_DEVICE(USB_VENDOR_ID_CJTOUCH,
1314                         USB_DEVICE_ID_CJTOUCH_MULTI_TOUCH_0020) },
1315         { .driver_data = MT_CLS_NSMU,
1316                 MT_USB_DEVICE(USB_VENDOR_ID_CJTOUCH,
1317                         USB_DEVICE_ID_CJTOUCH_MULTI_TOUCH_0040) },
1318
1319         /* CVTouch panels */
1320         { .driver_data = MT_CLS_NSMU,
1321                 MT_USB_DEVICE(USB_VENDOR_ID_CVTOUCH,
1322                         USB_DEVICE_ID_CVTOUCH_SCREEN) },
1323
1324         /* eGalax devices (resistive) */
1325         { .driver_data = MT_CLS_EGALAX,
1326                 MT_USB_DEVICE(USB_VENDOR_ID_DWAV,
1327                         USB_DEVICE_ID_DWAV_EGALAX_MULTITOUCH_480D) },
1328         { .driver_data = MT_CLS_EGALAX,
1329                 MT_USB_DEVICE(USB_VENDOR_ID_DWAV,
1330                         USB_DEVICE_ID_DWAV_EGALAX_MULTITOUCH_480E) },
1331
1332         /* eGalax devices (capacitive) */
1333         { .driver_data = MT_CLS_EGALAX_SERIAL,
1334                 MT_USB_DEVICE(USB_VENDOR_ID_DWAV,
1335                         USB_DEVICE_ID_DWAV_EGALAX_MULTITOUCH_7207) },
1336         { .driver_data = MT_CLS_EGALAX,
1337                 MT_USB_DEVICE(USB_VENDOR_ID_DWAV,
1338                         USB_DEVICE_ID_DWAV_EGALAX_MULTITOUCH_720C) },
1339         { .driver_data = MT_CLS_EGALAX_SERIAL,
1340                 MT_USB_DEVICE(USB_VENDOR_ID_DWAV,
1341                         USB_DEVICE_ID_DWAV_EGALAX_MULTITOUCH_7224) },
1342         { .driver_data = MT_CLS_EGALAX_SERIAL,
1343                 MT_USB_DEVICE(USB_VENDOR_ID_DWAV,
1344                         USB_DEVICE_ID_DWAV_EGALAX_MULTITOUCH_722A) },
1345         { .driver_data = MT_CLS_EGALAX_SERIAL,
1346                 MT_USB_DEVICE(USB_VENDOR_ID_DWAV,
1347                         USB_DEVICE_ID_DWAV_EGALAX_MULTITOUCH_725E) },
1348         { .driver_data = MT_CLS_EGALAX_SERIAL,
1349                 MT_USB_DEVICE(USB_VENDOR_ID_DWAV,
1350                         USB_DEVICE_ID_DWAV_EGALAX_MULTITOUCH_7262) },
1351         { .driver_data = MT_CLS_EGALAX,
1352                 MT_USB_DEVICE(USB_VENDOR_ID_DWAV,
1353                         USB_DEVICE_ID_DWAV_EGALAX_MULTITOUCH_726B) },
1354         { .driver_data = MT_CLS_EGALAX,
1355                 MT_USB_DEVICE(USB_VENDOR_ID_DWAV,
1356                         USB_DEVICE_ID_DWAV_EGALAX_MULTITOUCH_72A1) },
1357         { .driver_data = MT_CLS_EGALAX_SERIAL,
1358                 MT_USB_DEVICE(USB_VENDOR_ID_DWAV,
1359                         USB_DEVICE_ID_DWAV_EGALAX_MULTITOUCH_72AA) },
1360         { .driver_data = MT_CLS_EGALAX,
1361                 HID_USB_DEVICE(USB_VENDOR_ID_DWAV,
1362                         USB_DEVICE_ID_DWAV_EGALAX_MULTITOUCH_72C4) },
1363         { .driver_data = MT_CLS_EGALAX,
1364                 HID_USB_DEVICE(USB_VENDOR_ID_DWAV,
1365                         USB_DEVICE_ID_DWAV_EGALAX_MULTITOUCH_72D0) },
1366         { .driver_data = MT_CLS_EGALAX,
1367                 MT_USB_DEVICE(USB_VENDOR_ID_DWAV,
1368                         USB_DEVICE_ID_DWAV_EGALAX_MULTITOUCH_72FA) },
1369         { .driver_data = MT_CLS_EGALAX,
1370                 MT_USB_DEVICE(USB_VENDOR_ID_DWAV,
1371                         USB_DEVICE_ID_DWAV_EGALAX_MULTITOUCH_7302) },
1372         { .driver_data = MT_CLS_EGALAX_SERIAL,
1373                 MT_USB_DEVICE(USB_VENDOR_ID_DWAV,
1374                         USB_DEVICE_ID_DWAV_EGALAX_MULTITOUCH_7349) },
1375         { .driver_data = MT_CLS_EGALAX_SERIAL,
1376                 MT_USB_DEVICE(USB_VENDOR_ID_DWAV,
1377                         USB_DEVICE_ID_DWAV_EGALAX_MULTITOUCH_73F7) },
1378         { .driver_data = MT_CLS_EGALAX_SERIAL,
1379                 MT_USB_DEVICE(USB_VENDOR_ID_DWAV,
1380                         USB_DEVICE_ID_DWAV_EGALAX_MULTITOUCH_A001) },
1381
1382         /* Elitegroup panel */
1383         { .driver_data = MT_CLS_SERIAL,
1384                 MT_USB_DEVICE(USB_VENDOR_ID_ELITEGROUP,
1385                         USB_DEVICE_ID_ELITEGROUP_05D8) },
1386
1387         /* Flatfrog Panels */
1388         { .driver_data = MT_CLS_FLATFROG,
1389                 MT_USB_DEVICE(USB_VENDOR_ID_FLATFROG,
1390                         USB_DEVICE_ID_MULTITOUCH_3200) },
1391
1392         /* FocalTech Panels */
1393         { .driver_data = MT_CLS_SERIAL,
1394                 MT_USB_DEVICE(USB_VENDOR_ID_CYGNAL,
1395                         USB_DEVICE_ID_FOCALTECH_FTXXXX_MULTITOUCH) },
1396
1397         /* GeneralTouch panel */
1398         { .driver_data = MT_CLS_GENERALTOUCH_TWOFINGERS,
1399                 MT_USB_DEVICE(USB_VENDOR_ID_GENERAL_TOUCH,
1400                         USB_DEVICE_ID_GENERAL_TOUCH_WIN7_TWOFINGERS) },
1401         { .driver_data = MT_CLS_GENERALTOUCH_PWT_TENFINGERS,
1402                 MT_USB_DEVICE(USB_VENDOR_ID_GENERAL_TOUCH,
1403                         USB_DEVICE_ID_GENERAL_TOUCH_WIN8_PWT_TENFINGERS) },
1404         { .driver_data = MT_CLS_GENERALTOUCH_TWOFINGERS,
1405                 MT_USB_DEVICE(USB_VENDOR_ID_GENERAL_TOUCH,
1406                         USB_DEVICE_ID_GENERAL_TOUCH_WIN8_PIT_0101) },
1407         { .driver_data = MT_CLS_GENERALTOUCH_PWT_TENFINGERS,
1408                 MT_USB_DEVICE(USB_VENDOR_ID_GENERAL_TOUCH,
1409                         USB_DEVICE_ID_GENERAL_TOUCH_WIN8_PIT_0102) },
1410         { .driver_data = MT_CLS_GENERALTOUCH_PWT_TENFINGERS,
1411                 MT_USB_DEVICE(USB_VENDOR_ID_GENERAL_TOUCH,
1412                         USB_DEVICE_ID_GENERAL_TOUCH_WIN8_PIT_0106) },
1413         { .driver_data = MT_CLS_GENERALTOUCH_PWT_TENFINGERS,
1414                 MT_USB_DEVICE(USB_VENDOR_ID_GENERAL_TOUCH,
1415                         USB_DEVICE_ID_GENERAL_TOUCH_WIN8_PIT_010A) },
1416         { .driver_data = MT_CLS_GENERALTOUCH_PWT_TENFINGERS,
1417                 MT_USB_DEVICE(USB_VENDOR_ID_GENERAL_TOUCH,
1418                         USB_DEVICE_ID_GENERAL_TOUCH_WIN8_PIT_E100) },
1419
1420         /* Gametel game controller */
1421         { .driver_data = MT_CLS_NSMU,
1422                 MT_BT_DEVICE(USB_VENDOR_ID_FRUCTEL,
1423                         USB_DEVICE_ID_GAMETEL_MT_MODE) },
1424
1425         /* GoodTouch panels */
1426         { .driver_data = MT_CLS_NSMU,
1427                 MT_USB_DEVICE(USB_VENDOR_ID_GOODTOUCH,
1428                         USB_DEVICE_ID_GOODTOUCH_000f) },
1429
1430         /* Hanvon panels */
1431         { .driver_data = MT_CLS_DUAL_INRANGE_CONTACTID,
1432                 MT_USB_DEVICE(USB_VENDOR_ID_HANVON_ALT,
1433                         USB_DEVICE_ID_HANVON_ALT_MULTITOUCH) },
1434
1435         /* Ilitek dual touch panel */
1436         {  .driver_data = MT_CLS_NSMU,
1437                 MT_USB_DEVICE(USB_VENDOR_ID_ILITEK,
1438                         USB_DEVICE_ID_ILITEK_MULTITOUCH) },
1439
1440         /* LG Melfas panel */
1441         { .driver_data = MT_CLS_LG,
1442                 HID_USB_DEVICE(USB_VENDOR_ID_LG,
1443                         USB_DEVICE_ID_LG_MELFAS_MT) },
1444
1445         /* MosArt panels */
1446         { .driver_data = MT_CLS_CONFIDENCE_MINUS_ONE,
1447                 MT_USB_DEVICE(USB_VENDOR_ID_ASUS,
1448                         USB_DEVICE_ID_ASUS_T91MT)},
1449         { .driver_data = MT_CLS_CONFIDENCE_MINUS_ONE,
1450                 MT_USB_DEVICE(USB_VENDOR_ID_ASUS,
1451                         USB_DEVICE_ID_ASUSTEK_MULTITOUCH_YFO) },
1452         { .driver_data = MT_CLS_CONFIDENCE_MINUS_ONE,
1453                 MT_USB_DEVICE(USB_VENDOR_ID_TURBOX,
1454                         USB_DEVICE_ID_TURBOX_TOUCHSCREEN_MOSART) },
1455
1456         /* Panasonic panels */
1457         { .driver_data = MT_CLS_PANASONIC,
1458                 MT_USB_DEVICE(USB_VENDOR_ID_PANASONIC,
1459                         USB_DEVICE_ID_PANABOARD_UBT780) },
1460         { .driver_data = MT_CLS_PANASONIC,
1461                 MT_USB_DEVICE(USB_VENDOR_ID_PANASONIC,
1462                         USB_DEVICE_ID_PANABOARD_UBT880) },
1463
1464         /* Novatek Panel */
1465         { .driver_data = MT_CLS_NSMU,
1466                 MT_USB_DEVICE(USB_VENDOR_ID_NOVATEK,
1467                         USB_DEVICE_ID_NOVATEK_PCT) },
1468
1469         /* Ntrig Panel */
1470         { .driver_data = MT_CLS_NSMU,
1471                 HID_DEVICE(BUS_I2C, HID_GROUP_MULTITOUCH_WIN_8,
1472                         USB_VENDOR_ID_NTRIG, 0x1b05) },
1473
1474         /* PixArt optical touch screen */
1475         { .driver_data = MT_CLS_INRANGE_CONTACTNUMBER,
1476                 MT_USB_DEVICE(USB_VENDOR_ID_PIXART,
1477                         USB_DEVICE_ID_PIXART_OPTICAL_TOUCH_SCREEN) },
1478         { .driver_data = MT_CLS_INRANGE_CONTACTNUMBER,
1479                 MT_USB_DEVICE(USB_VENDOR_ID_PIXART,
1480                         USB_DEVICE_ID_PIXART_OPTICAL_TOUCH_SCREEN1) },
1481         { .driver_data = MT_CLS_INRANGE_CONTACTNUMBER,
1482                 MT_USB_DEVICE(USB_VENDOR_ID_PIXART,
1483                         USB_DEVICE_ID_PIXART_OPTICAL_TOUCH_SCREEN2) },
1484
1485         /* PixCir-based panels */
1486         { .driver_data = MT_CLS_DUAL_INRANGE_CONTACTID,
1487                 MT_USB_DEVICE(USB_VENDOR_ID_CANDO,
1488                         USB_DEVICE_ID_CANDO_PIXCIR_MULTI_TOUCH) },
1489
1490         /* Quanta-based panels */
1491         { .driver_data = MT_CLS_CONFIDENCE_CONTACT_ID,
1492                 MT_USB_DEVICE(USB_VENDOR_ID_QUANTA,
1493                         USB_DEVICE_ID_QUANTA_OPTICAL_TOUCH_3001) },
1494
1495         /* Stantum panels */
1496         { .driver_data = MT_CLS_CONFIDENCE,
1497                 MT_USB_DEVICE(USB_VENDOR_ID_STANTUM_STM,
1498                         USB_DEVICE_ID_MTP_STM)},
1499
1500         /* TopSeed panels */
1501         { .driver_data = MT_CLS_TOPSEED,
1502                 MT_USB_DEVICE(USB_VENDOR_ID_TOPSEED2,
1503                         USB_DEVICE_ID_TOPSEED2_PERIPAD_701) },
1504
1505         /* Touch International panels */
1506         { .driver_data = MT_CLS_NSMU,
1507                 MT_USB_DEVICE(USB_VENDOR_ID_TOUCH_INTL,
1508                         USB_DEVICE_ID_TOUCH_INTL_MULTI_TOUCH) },
1509
1510         /* Unitec panels */
1511         { .driver_data = MT_CLS_NSMU,
1512                 MT_USB_DEVICE(USB_VENDOR_ID_UNITEC,
1513                         USB_DEVICE_ID_UNITEC_USB_TOUCH_0709) },
1514         { .driver_data = MT_CLS_NSMU,
1515                 MT_USB_DEVICE(USB_VENDOR_ID_UNITEC,
1516                         USB_DEVICE_ID_UNITEC_USB_TOUCH_0A19) },
1517
1518         /* VTL panels */
1519         { .driver_data = MT_CLS_VTL,
1520                 MT_USB_DEVICE(USB_VENDOR_ID_VTL,
1521                         USB_DEVICE_ID_VTL_MULTITOUCH_FF3F) },
1522
1523         /* Wistron panels */
1524         { .driver_data = MT_CLS_NSMU,
1525                 MT_USB_DEVICE(USB_VENDOR_ID_WISTRON,
1526                         USB_DEVICE_ID_WISTRON_OPTICAL_TOUCH) },
1527
1528         /* XAT */
1529         { .driver_data = MT_CLS_NSMU,
1530                 MT_USB_DEVICE(USB_VENDOR_ID_XAT,
1531                         USB_DEVICE_ID_XAT_CSR) },
1532
1533         /* Xiroku */
1534         { .driver_data = MT_CLS_NSMU,
1535                 MT_USB_DEVICE(USB_VENDOR_ID_XIROKU,
1536                         USB_DEVICE_ID_XIROKU_SPX) },
1537         { .driver_data = MT_CLS_NSMU,
1538                 MT_USB_DEVICE(USB_VENDOR_ID_XIROKU,
1539                         USB_DEVICE_ID_XIROKU_MPX) },
1540         { .driver_data = MT_CLS_NSMU,
1541                 MT_USB_DEVICE(USB_VENDOR_ID_XIROKU,
1542                         USB_DEVICE_ID_XIROKU_CSR) },
1543         { .driver_data = MT_CLS_NSMU,
1544                 MT_USB_DEVICE(USB_VENDOR_ID_XIROKU,
1545                         USB_DEVICE_ID_XIROKU_SPX1) },
1546         { .driver_data = MT_CLS_NSMU,
1547                 MT_USB_DEVICE(USB_VENDOR_ID_XIROKU,
1548                         USB_DEVICE_ID_XIROKU_MPX1) },
1549         { .driver_data = MT_CLS_NSMU,
1550                 MT_USB_DEVICE(USB_VENDOR_ID_XIROKU,
1551                         USB_DEVICE_ID_XIROKU_CSR1) },
1552         { .driver_data = MT_CLS_NSMU,
1553                 MT_USB_DEVICE(USB_VENDOR_ID_XIROKU,
1554                         USB_DEVICE_ID_XIROKU_SPX2) },
1555         { .driver_data = MT_CLS_NSMU,
1556                 MT_USB_DEVICE(USB_VENDOR_ID_XIROKU,
1557                         USB_DEVICE_ID_XIROKU_MPX2) },
1558         { .driver_data = MT_CLS_NSMU,
1559                 MT_USB_DEVICE(USB_VENDOR_ID_XIROKU,
1560                         USB_DEVICE_ID_XIROKU_CSR2) },
1561
1562         /* Generic MT device */
1563         { HID_DEVICE(HID_BUS_ANY, HID_GROUP_MULTITOUCH, HID_ANY_ID, HID_ANY_ID) },
1564
1565         /* Generic Win 8 certified MT device */
1566         {  .driver_data = MT_CLS_WIN_8,
1567                 HID_DEVICE(HID_BUS_ANY, HID_GROUP_MULTITOUCH_WIN_8,
1568                         HID_ANY_ID, HID_ANY_ID) },
1569         { }
1570 };
1571 MODULE_DEVICE_TABLE(hid, mt_devices);
1572
1573 static const struct hid_usage_id mt_grabbed_usages[] = {
1574         { HID_ANY_ID, HID_ANY_ID, HID_ANY_ID },
1575         { HID_ANY_ID - 1, HID_ANY_ID - 1, HID_ANY_ID - 1}
1576 };
1577
1578 static struct hid_driver mt_driver = {
1579         .name = "hid-multitouch",
1580         .id_table = mt_devices,
1581         .probe = mt_probe,
1582         .remove = mt_remove,
1583         .input_mapping = mt_input_mapping,
1584         .input_mapped = mt_input_mapped,
1585         .input_configured = mt_input_configured,
1586         .feature_mapping = mt_feature_mapping,
1587         .usage_table = mt_grabbed_usages,
1588         .event = mt_event,
1589         .report = mt_report,
1590 #ifdef CONFIG_PM
1591         .reset_resume = mt_reset_resume,
1592         .resume = mt_resume,
1593 #endif
1594 };
1595 module_hid_driver(mt_driver);