drivers/hid/hid-multitouch.c

/* [<][>][^][v][top][bottom][index][help] */
This source file includes following definitions.
cypress_compute_slot
mt_show_quirks
mt_set_quirks
mt_get_feature
mt_feature_mapping
set_abs
mt_allocate_usage
mt_allocate_application
mt_find_application
mt_allocate_report_data
mt_find_report_data
mt_store_field
mt_touch_input_mapping
mt_compute_slot
mt_release_pending_palms
mt_sync_frame
mt_compute_timestamp
mt_touch_event
mt_process_slot
mt_process_mt_event
mt_touch_report
mt_touch_input_configured
mt_input_mapping
mt_input_mapped
mt_event
mt_report
mt_need_to_apply_feature
mt_set_modes
mt_post_parse_default_settings
mt_post_parse
mt_input_configured
mt_fix_const_field
mt_fix_const_fields
mt_release_contacts
mt_expired_timeout
mt_probe
mt_reset_resume
mt_resume
mt_remove
   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  *  HID driver for multitouch panels
   4  *
   5  *  Copyright (c) 2010-2012 Stephane Chatty <chatty@enac.fr>
   6  *  Copyright (c) 2010-2013 Benjamin Tissoires <benjamin.tissoires@gmail.com>
   7  *  Copyright (c) 2010-2012 Ecole Nationale de l'Aviation Civile, France
   8  *  Copyright (c) 2012-2013 Red Hat, Inc
   9  *
  10  *  This code is partly based on hid-egalax.c:
  11  *
  12  *  Copyright (c) 2010 Stephane Chatty <chatty@enac.fr>
  13  *  Copyright (c) 2010 Henrik Rydberg <rydberg@euromail.se>
  14  *  Copyright (c) 2010 Canonical, Ltd.
  15  *
  16  *  This code is partly based on hid-3m-pct.c:
  17  *
  18  *  Copyright (c) 2009-2010 Stephane Chatty <chatty@enac.fr>
  19  *  Copyright (c) 2010      Henrik Rydberg <rydberg@euromail.se>
  20  *  Copyright (c) 2010      Canonical, Ltd.
  21  */
  22 
  23 /*
  24  */
  25 
  26 /*
  27  * This driver is regularly tested thanks to the test suite in hid-tools[1].
  28  * Please run these regression tests before patching this module so that
  29  * your patch won't break existing known devices.
  30  *
  31  * [1] https://gitlab.freedesktop.org/libevdev/hid-tools
  32  */
  33 
  34 #include <linux/device.h>
  35 #include <linux/hid.h>
  36 #include <linux/module.h>
  37 #include <linux/slab.h>
  38 #include <linux/input/mt.h>
  39 #include <linux/jiffies.h>
  40 #include <linux/string.h>
  41 #include <linux/timer.h>
  42 
  43 
  44 MODULE_AUTHOR("Stephane Chatty <chatty@enac.fr>");
  45 MODULE_AUTHOR("Benjamin Tissoires <benjamin.tissoires@gmail.com>");
  46 MODULE_DESCRIPTION("HID multitouch panels");
  47 MODULE_LICENSE("GPL");
  48 
  49 #include "hid-ids.h"
  50 
  51 /* quirks to control the device */
  52 #define MT_QUIRK_NOT_SEEN_MEANS_UP      BIT(0)
  53 #define MT_QUIRK_SLOT_IS_CONTACTID      BIT(1)
  54 #define MT_QUIRK_CYPRESS                BIT(2)
  55 #define MT_QUIRK_SLOT_IS_CONTACTNUMBER  BIT(3)
  56 #define MT_QUIRK_ALWAYS_VALID           BIT(4)
  57 #define MT_QUIRK_VALID_IS_INRANGE       BIT(5)
  58 #define MT_QUIRK_VALID_IS_CONFIDENCE    BIT(6)
  59 #define MT_QUIRK_CONFIDENCE             BIT(7)
  60 #define MT_QUIRK_SLOT_IS_CONTACTID_MINUS_ONE    BIT(8)
  61 #define MT_QUIRK_NO_AREA                BIT(9)
  62 #define MT_QUIRK_IGNORE_DUPLICATES      BIT(10)
  63 #define MT_QUIRK_HOVERING               BIT(11)
  64 #define MT_QUIRK_CONTACT_CNT_ACCURATE   BIT(12)
  65 #define MT_QUIRK_FORCE_GET_FEATURE      BIT(13)
  66 #define MT_QUIRK_FIX_CONST_CONTACT_ID   BIT(14)
  67 #define MT_QUIRK_TOUCH_SIZE_SCALING     BIT(15)
  68 #define MT_QUIRK_STICKY_FINGERS         BIT(16)
  69 #define MT_QUIRK_ASUS_CUSTOM_UP         BIT(17)
  70 #define MT_QUIRK_WIN8_PTP_BUTTONS       BIT(18)
  71 #define MT_QUIRK_SEPARATE_APP_REPORT    BIT(19)
  72 #define MT_QUIRK_FORCE_MULTI_INPUT      BIT(20)
  73 
  74 #define MT_INPUTMODE_TOUCHSCREEN        0x02
  75 #define MT_INPUTMODE_TOUCHPAD           0x03
  76 
  77 #define MT_BUTTONTYPE_CLICKPAD          0
  78 
  79 enum latency_mode {
  80         HID_LATENCY_NORMAL = 0,
  81         HID_LATENCY_HIGH = 1,
  82 };
  83 
  84 #define MT_IO_FLAGS_RUNNING             0
  85 #define MT_IO_FLAGS_ACTIVE_SLOTS        1
  86 #define MT_IO_FLAGS_PENDING_SLOTS       2
  87 
  88 static const bool mtrue = true;         /* default for true */
  89 static const bool mfalse;               /* default for false */
  90 static const __s32 mzero;               /* default for 0 */
  91 
  92 #define DEFAULT_TRUE    ((void *)&mtrue)
  93 #define DEFAULT_FALSE   ((void *)&mfalse)
  94 #define DEFAULT_ZERO    ((void *)&mzero)
  95 
  96 struct mt_usages {
  97         struct list_head list;
  98         __s32 *x, *y, *cx, *cy, *p, *w, *h, *a;
  99         __s32 *contactid;       /* the device ContactID assigned to this slot */
 100         bool *tip_state;        /* is the touch valid? */
 101         bool *inrange_state;    /* is the finger in proximity of the sensor? */
 102         bool *confidence_state; /* is the touch made by a finger? */
 103 };
 104 
 105 struct mt_application {
 106         struct list_head list;
 107         unsigned int application;
 108         unsigned int report_id;
 109         struct list_head mt_usages;     /* mt usages list */
 110 
 111         __s32 quirks;
 112 
 113         __s32 *scantime;                /* scantime reported */
 114         __s32 scantime_logical_max;     /* max value for raw scantime */
 115 
 116         __s32 *raw_cc;                  /* contact count in the report */
 117         int left_button_state;          /* left button state */
 118         unsigned int mt_flags;          /* flags to pass to input-mt */
 119 
 120         unsigned long *pending_palm_slots;      /* slots where we reported palm
 121                                                  * and need to release */
 122 
 123         __u8 num_received;      /* how many contacts we received */
 124         __u8 num_expected;      /* expected last contact index */
 125         __u8 buttons_count;     /* number of physical buttons per touchpad */
 126         __u8 touches_by_report; /* how many touches are present in one report:
 127                                  * 1 means we should use a serial protocol
 128                                  * > 1 means hybrid (multitouch) protocol
 129                                  */
 130 
 131         __s32 dev_time;         /* the scan time provided by the device */
 132         unsigned long jiffies;  /* the frame's jiffies */
 133         int timestamp;          /* the timestamp to be sent */
 134         int prev_scantime;              /* scantime reported previously */
 135 
 136         bool have_contact_count;
 137 };
 138 
 139 struct mt_class {
 140         __s32 name;     /* MT_CLS */
 141         __s32 quirks;
 142         __s32 sn_move;  /* Signal/noise ratio for move events */
 143         __s32 sn_width; /* Signal/noise ratio for width events */
 144         __s32 sn_height;        /* Signal/noise ratio for height events */
 145         __s32 sn_pressure;      /* Signal/noise ratio for pressure events */
 146         __u8 maxcontacts;
 147         bool is_indirect;       /* true for touchpads */
 148         bool export_all_inputs; /* do not ignore mouse, keyboards, etc... */
 149 };
 150 
 151 struct mt_report_data {
 152         struct list_head list;
 153         struct hid_report *report;
 154         struct mt_application *application;
 155         bool is_mt_collection;
 156 };
 157 
 158 struct mt_device {
 159         struct mt_class mtclass;        /* our mt device class */
 160         struct timer_list release_timer;        /* to release sticky fingers */
 161         struct hid_device *hdev;        /* hid_device we're attached to */
 162         unsigned long mt_io_flags;      /* mt flags (MT_IO_FLAGS_*) */
 163         __u8 inputmode_value;   /* InputMode HID feature value */
 164         __u8 maxcontacts;
 165         bool is_buttonpad;      /* is this device a button pad? */
 166         bool serial_maybe;      /* need to check for serial protocol */
 167 
 168         struct list_head applications;
 169         struct list_head reports;
 170 };
 171 
 172 static void mt_post_parse_default_settings(struct mt_device *td,
 173                                            struct mt_application *app);
 174 static void mt_post_parse(struct mt_device *td, struct mt_application *app);
 175 
 176 /* classes of device behavior */
 177 #define MT_CLS_DEFAULT                          0x0001
 178 
 179 #define MT_CLS_SERIAL                           0x0002
 180 #define MT_CLS_CONFIDENCE                       0x0003
 181 #define MT_CLS_CONFIDENCE_CONTACT_ID            0x0004
 182 #define MT_CLS_CONFIDENCE_MINUS_ONE             0x0005
 183 #define MT_CLS_DUAL_INRANGE_CONTACTID           0x0006
 184 #define MT_CLS_DUAL_INRANGE_CONTACTNUMBER       0x0007
 185 /* reserved                                     0x0008 */
 186 #define MT_CLS_INRANGE_CONTACTNUMBER            0x0009
 187 #define MT_CLS_NSMU                             0x000a
 188 /* reserved                                     0x0010 */
 189 /* reserved                                     0x0011 */
 190 #define MT_CLS_WIN_8                            0x0012
 191 #define MT_CLS_EXPORT_ALL_INPUTS                0x0013
 192 #define MT_CLS_WIN_8_DUAL                       0x0014
 193 #define MT_CLS_WIN_8_FORCE_MULTI_INPUT          0x0015
 194 
 195 /* vendor specific classes */
 196 #define MT_CLS_3M                               0x0101
 197 /* reserved                                     0x0102 */
 198 #define MT_CLS_EGALAX                           0x0103
 199 #define MT_CLS_EGALAX_SERIAL                    0x0104
 200 #define MT_CLS_TOPSEED                          0x0105
 201 #define MT_CLS_PANASONIC                        0x0106
 202 #define MT_CLS_FLATFROG                         0x0107
 203 #define MT_CLS_GENERALTOUCH_TWOFINGERS          0x0108
 204 #define MT_CLS_GENERALTOUCH_PWT_TENFINGERS      0x0109
 205 #define MT_CLS_LG                               0x010a
 206 #define MT_CLS_ASUS                             0x010b
 207 #define MT_CLS_VTL                              0x0110
 208 #define MT_CLS_GOOGLE                           0x0111
 209 #define MT_CLS_RAZER_BLADE_STEALTH              0x0112
 210 #define MT_CLS_SMART_TECH                       0x0113
 211 
 212 #define MT_DEFAULT_MAXCONTACT   10
 213 #define MT_MAX_MAXCONTACT       250
 214 
 215 /*
 216  * Resync device and local timestamps after that many microseconds without
 217  * receiving data.
 218  */
 219 #define MAX_TIMESTAMP_INTERVAL  1000000
 220 
 221 #define MT_USB_DEVICE(v, p)     HID_DEVICE(BUS_USB, HID_GROUP_MULTITOUCH, v, p)
 222 #define MT_BT_DEVICE(v, p)      HID_DEVICE(BUS_BLUETOOTH, HID_GROUP_MULTITOUCH, v, p)
 223 
 224 /*
 225  * these device-dependent functions determine what slot corresponds
 226  * to a valid contact that was just read.
 227  */
 228 
 229 static int cypress_compute_slot(struct mt_application *application,
 230                                 struct mt_usages *slot)
 231 {
 232         if (*slot->contactid != 0 || application->num_received == 0)
 233                 return *slot->contactid;
 234         else
 235                 return -1;
 236 }
 237 
 238 static const struct mt_class mt_classes[] = {
 239         { .name = MT_CLS_DEFAULT,
 240                 .quirks = MT_QUIRK_ALWAYS_VALID |
 241                         MT_QUIRK_CONTACT_CNT_ACCURATE },
 242         { .name = MT_CLS_NSMU,
 243                 .quirks = MT_QUIRK_NOT_SEEN_MEANS_UP },
 244         { .name = MT_CLS_SERIAL,
 245                 .quirks = MT_QUIRK_ALWAYS_VALID},
 246         { .name = MT_CLS_CONFIDENCE,
 247                 .quirks = MT_QUIRK_VALID_IS_CONFIDENCE },
 248         { .name = MT_CLS_CONFIDENCE_CONTACT_ID,
 249                 .quirks = MT_QUIRK_VALID_IS_CONFIDENCE |
 250                         MT_QUIRK_SLOT_IS_CONTACTID },
 251         { .name = MT_CLS_CONFIDENCE_MINUS_ONE,
 252                 .quirks = MT_QUIRK_VALID_IS_CONFIDENCE |
 253                         MT_QUIRK_SLOT_IS_CONTACTID_MINUS_ONE },
 254         { .name = MT_CLS_DUAL_INRANGE_CONTACTID,
 255                 .quirks = MT_QUIRK_VALID_IS_INRANGE |
 256                         MT_QUIRK_SLOT_IS_CONTACTID,
 257                 .maxcontacts = 2 },
 258         { .name = MT_CLS_DUAL_INRANGE_CONTACTNUMBER,
 259                 .quirks = MT_QUIRK_VALID_IS_INRANGE |
 260                         MT_QUIRK_SLOT_IS_CONTACTNUMBER,
 261                 .maxcontacts = 2 },
 262         { .name = MT_CLS_INRANGE_CONTACTNUMBER,
 263                 .quirks = MT_QUIRK_VALID_IS_INRANGE |
 264                         MT_QUIRK_SLOT_IS_CONTACTNUMBER },
 265         { .name = MT_CLS_WIN_8,
 266                 .quirks = MT_QUIRK_ALWAYS_VALID |
 267                         MT_QUIRK_IGNORE_DUPLICATES |
 268                         MT_QUIRK_HOVERING |
 269                         MT_QUIRK_CONTACT_CNT_ACCURATE |
 270                         MT_QUIRK_STICKY_FINGERS |
 271                         MT_QUIRK_WIN8_PTP_BUTTONS,
 272                 .export_all_inputs = true },
 273         { .name = MT_CLS_EXPORT_ALL_INPUTS,
 274                 .quirks = MT_QUIRK_ALWAYS_VALID |
 275                         MT_QUIRK_CONTACT_CNT_ACCURATE,
 276                 .export_all_inputs = true },
 277         { .name = MT_CLS_WIN_8_DUAL,
 278                 .quirks = MT_QUIRK_ALWAYS_VALID |
 279                         MT_QUIRK_IGNORE_DUPLICATES |
 280                         MT_QUIRK_HOVERING |
 281                         MT_QUIRK_CONTACT_CNT_ACCURATE |
 282                         MT_QUIRK_WIN8_PTP_BUTTONS,
 283                 .export_all_inputs = true },
 284         { .name = MT_CLS_WIN_8_FORCE_MULTI_INPUT,
 285                 .quirks = MT_QUIRK_ALWAYS_VALID |
 286                         MT_QUIRK_IGNORE_DUPLICATES |
 287                         MT_QUIRK_HOVERING |
 288                         MT_QUIRK_CONTACT_CNT_ACCURATE |
 289                         MT_QUIRK_STICKY_FINGERS |
 290                         MT_QUIRK_WIN8_PTP_BUTTONS |
 291                         MT_QUIRK_FORCE_MULTI_INPUT,
 292                 .export_all_inputs = true },
 293 
 294         /*
 295          * vendor specific classes
 296          */
 297         { .name = MT_CLS_3M,
 298                 .quirks = MT_QUIRK_VALID_IS_CONFIDENCE |
 299                         MT_QUIRK_SLOT_IS_CONTACTID |
 300                         MT_QUIRK_TOUCH_SIZE_SCALING,
 301                 .sn_move = 2048,
 302                 .sn_width = 128,
 303                 .sn_height = 128,
 304                 .maxcontacts = 60,
 305         },
 306         { .name = MT_CLS_EGALAX,
 307                 .quirks =  MT_QUIRK_SLOT_IS_CONTACTID |
 308                         MT_QUIRK_VALID_IS_INRANGE,
 309                 .sn_move = 4096,
 310                 .sn_pressure = 32,
 311         },
 312         { .name = MT_CLS_EGALAX_SERIAL,
 313                 .quirks =  MT_QUIRK_SLOT_IS_CONTACTID |
 314                         MT_QUIRK_ALWAYS_VALID,
 315                 .sn_move = 4096,
 316                 .sn_pressure = 32,
 317         },
 318         { .name = MT_CLS_TOPSEED,
 319                 .quirks = MT_QUIRK_ALWAYS_VALID,
 320                 .is_indirect = true,
 321                 .maxcontacts = 2,
 322         },
 323         { .name = MT_CLS_PANASONIC,
 324                 .quirks = MT_QUIRK_NOT_SEEN_MEANS_UP,
 325                 .maxcontacts = 4 },
 326         { .name = MT_CLS_GENERALTOUCH_TWOFINGERS,
 327                 .quirks = MT_QUIRK_NOT_SEEN_MEANS_UP |
 328                         MT_QUIRK_VALID_IS_INRANGE |
 329                         MT_QUIRK_SLOT_IS_CONTACTID,
 330                 .maxcontacts = 2
 331         },
 332         { .name = MT_CLS_GENERALTOUCH_PWT_TENFINGERS,
 333                 .quirks = MT_QUIRK_NOT_SEEN_MEANS_UP |
 334                         MT_QUIRK_SLOT_IS_CONTACTID
 335         },
 336 
 337         { .name = MT_CLS_FLATFROG,
 338                 .quirks = MT_QUIRK_NOT_SEEN_MEANS_UP |
 339                         MT_QUIRK_NO_AREA,
 340                 .sn_move = 2048,
 341                 .maxcontacts = 40,
 342         },
 343         { .name = MT_CLS_LG,
 344                 .quirks = MT_QUIRK_ALWAYS_VALID |
 345                         MT_QUIRK_FIX_CONST_CONTACT_ID |
 346                         MT_QUIRK_IGNORE_DUPLICATES |
 347                         MT_QUIRK_HOVERING |
 348                         MT_QUIRK_CONTACT_CNT_ACCURATE },
 349         { .name = MT_CLS_ASUS,
 350                 .quirks = MT_QUIRK_ALWAYS_VALID |
 351                         MT_QUIRK_CONTACT_CNT_ACCURATE |
 352                         MT_QUIRK_ASUS_CUSTOM_UP },
 353         { .name = MT_CLS_VTL,
 354                 .quirks = MT_QUIRK_ALWAYS_VALID |
 355                         MT_QUIRK_CONTACT_CNT_ACCURATE |
 356                         MT_QUIRK_FORCE_GET_FEATURE,
 357         },
 358         { .name = MT_CLS_GOOGLE,
 359                 .quirks = MT_QUIRK_ALWAYS_VALID |
 360                         MT_QUIRK_CONTACT_CNT_ACCURATE |
 361                         MT_QUIRK_SLOT_IS_CONTACTID |
 362                         MT_QUIRK_HOVERING
 363         },
 364         { .name = MT_CLS_RAZER_BLADE_STEALTH,
 365                 .quirks = MT_QUIRK_ALWAYS_VALID |
 366                         MT_QUIRK_IGNORE_DUPLICATES |
 367                         MT_QUIRK_HOVERING |
 368                         MT_QUIRK_CONTACT_CNT_ACCURATE |
 369                         MT_QUIRK_WIN8_PTP_BUTTONS,
 370         },
 371         { .name = MT_CLS_SMART_TECH,
 372                 .quirks = MT_QUIRK_ALWAYS_VALID |
 373                         MT_QUIRK_IGNORE_DUPLICATES |
 374                         MT_QUIRK_CONTACT_CNT_ACCURATE |
 375                         MT_QUIRK_SEPARATE_APP_REPORT,
 376         },
 377         { }
 378 };
 379 
 380 static ssize_t mt_show_quirks(struct device *dev,
 381                            struct device_attribute *attr,
 382                            char *buf)
 383 {
 384         struct hid_device *hdev = to_hid_device(dev);
 385         struct mt_device *td = hid_get_drvdata(hdev);
 386 
 387         return sprintf(buf, "%u\n", td->mtclass.quirks);
 388 }
 389 
 390 static ssize_t mt_set_quirks(struct device *dev,
 391                           struct device_attribute *attr,
 392                           const char *buf, size_t count)
 393 {
 394         struct hid_device *hdev = to_hid_device(dev);
 395         struct mt_device *td = hid_get_drvdata(hdev);
 396         struct mt_application *application;
 397 
 398         unsigned long val;
 399 
 400         if (kstrtoul(buf, 0, &val))
 401                 return -EINVAL;
 402 
 403         td->mtclass.quirks = val;
 404 
 405         list_for_each_entry(application, &td->applications, list) {
 406                 application->quirks = val;
 407                 if (!application->have_contact_count)
 408                         application->quirks &= ~MT_QUIRK_CONTACT_CNT_ACCURATE;
 409         }
 410 
 411         return count;
 412 }
 413 
 414 static DEVICE_ATTR(quirks, S_IWUSR | S_IRUGO, mt_show_quirks, mt_set_quirks);
 415 
 416 static struct attribute *sysfs_attrs[] = {
 417         &dev_attr_quirks.attr,
 418         NULL
 419 };
 420 
 421 static const struct attribute_group mt_attribute_group = {
 422         .attrs = sysfs_attrs
 423 };
 424 
 425 static void mt_get_feature(struct hid_device *hdev, struct hid_report *report)
 426 {
 427         int ret;
 428         u32 size = hid_report_len(report);
 429         u8 *buf;
 430 
 431         /*
 432          * Do not fetch the feature report if the device has been explicitly
 433          * marked as non-capable.
 434          */
 435         if (hdev->quirks & HID_QUIRK_NO_INIT_REPORTS)
 436                 return;
 437 
 438         buf = hid_alloc_report_buf(report, GFP_KERNEL);
 439         if (!buf)
 440                 return;
 441 
 442         ret = hid_hw_raw_request(hdev, report->id, buf, size,
 443                                  HID_FEATURE_REPORT, HID_REQ_GET_REPORT);
 444         if (ret < 0) {
 445                 dev_warn(&hdev->dev, "failed to fetch feature %d\n",
 446                          report->id);
 447         } else {
 448                 ret = hid_report_raw_event(hdev, HID_FEATURE_REPORT, buf,
 449                                            size, 0);
 450                 if (ret)
 451                         dev_warn(&hdev->dev, "failed to report feature\n");
 452         }
 453 
 454         kfree(buf);
 455 }
 456 
 457 static void mt_feature_mapping(struct hid_device *hdev,
 458                 struct hid_field *field, struct hid_usage *usage)
 459 {
 460         struct mt_device *td = hid_get_drvdata(hdev);
 461 
 462         switch (usage->hid) {
 463         case HID_DG_CONTACTMAX:
 464                 mt_get_feature(hdev, field->report);
 465 
 466                 td->maxcontacts = field->value[0];
 467                 if (!td->maxcontacts &&
 468                     field->logical_maximum <= MT_MAX_MAXCONTACT)
 469                         td->maxcontacts = field->logical_maximum;
 470                 if (td->mtclass.maxcontacts)
 471                         /* check if the maxcontacts is given by the class */
 472                         td->maxcontacts = td->mtclass.maxcontacts;
 473 
 474                 break;
 475         case HID_DG_BUTTONTYPE:
 476                 if (usage->usage_index >= field->report_count) {
 477                         dev_err(&hdev->dev, "HID_DG_BUTTONTYPE out of range\n");
 478                         break;
 479                 }
 480 
 481                 mt_get_feature(hdev, field->report);
 482                 if (field->value[usage->usage_index] == MT_BUTTONTYPE_CLICKPAD)
 483                         td->is_buttonpad = true;
 484 
 485                 break;
 486         case 0xff0000c5:
 487                 /* Retrieve the Win8 blob once to enable some devices */
 488                 if (usage->usage_index == 0)
 489                         mt_get_feature(hdev, field->report);
 490                 break;
 491         }
 492 }
 493 
 494 static void set_abs(struct input_dev *input, unsigned int code,
 495                 struct hid_field *field, int snratio)
 496 {
 497         int fmin = field->logical_minimum;
 498         int fmax = field->logical_maximum;
 499         int fuzz = snratio ? (fmax - fmin) / snratio : 0;
 500         input_set_abs_params(input, code, fmin, fmax, fuzz, 0);
 501         input_abs_set_res(input, code, hidinput_calc_abs_res(field, code));
 502 }
 503 
 504 static struct mt_usages *mt_allocate_usage(struct hid_device *hdev,
 505                                            struct mt_application *application)
 506 {
 507         struct mt_usages *usage;
 508 
 509         usage = devm_kzalloc(&hdev->dev, sizeof(*usage), GFP_KERNEL);
 510         if (!usage)
 511                 return NULL;
 512 
 513         /* set some defaults so we do not need to check for null pointers */
 514         usage->x = DEFAULT_ZERO;
 515         usage->y = DEFAULT_ZERO;
 516         usage->cx = DEFAULT_ZERO;
 517         usage->cy = DEFAULT_ZERO;
 518         usage->p = DEFAULT_ZERO;
 519         usage->w = DEFAULT_ZERO;
 520         usage->h = DEFAULT_ZERO;
 521         usage->a = DEFAULT_ZERO;
 522         usage->contactid = DEFAULT_ZERO;
 523         usage->tip_state = DEFAULT_FALSE;
 524         usage->inrange_state = DEFAULT_FALSE;
 525         usage->confidence_state = DEFAULT_TRUE;
 526 
 527         list_add_tail(&usage->list, &application->mt_usages);
 528 
 529         return usage;
 530 }
 531 
 532 static struct mt_application *mt_allocate_application(struct mt_device *td,
 533                                                       struct hid_report *report)
 534 {
 535         unsigned int application = report->application;
 536         struct mt_application *mt_application;
 537 
 538         mt_application = devm_kzalloc(&td->hdev->dev, sizeof(*mt_application),
 539                                       GFP_KERNEL);
 540         if (!mt_application)
 541                 return NULL;
 542 
 543         mt_application->application = application;
 544         INIT_LIST_HEAD(&mt_application->mt_usages);
 545 
 546         if (application == HID_DG_TOUCHSCREEN)
 547                 mt_application->mt_flags |= INPUT_MT_DIRECT;
 548 
 549         /*
 550          * Model touchscreens providing buttons as touchpads.
 551          */
 552         if (application == HID_DG_TOUCHPAD) {
 553                 mt_application->mt_flags |= INPUT_MT_POINTER;
 554                 td->inputmode_value = MT_INPUTMODE_TOUCHPAD;
 555         }
 556 
 557         mt_application->scantime = DEFAULT_ZERO;
 558         mt_application->raw_cc = DEFAULT_ZERO;
 559         mt_application->quirks = td->mtclass.quirks;
 560         mt_application->report_id = report->id;
 561 
 562         list_add_tail(&mt_application->list, &td->applications);
 563 
 564         return mt_application;
 565 }
 566 
 567 static struct mt_application *mt_find_application(struct mt_device *td,
 568                                                   struct hid_report *report)
 569 {
 570         unsigned int application = report->application;
 571         struct mt_application *tmp, *mt_application = NULL;
 572 
 573         list_for_each_entry(tmp, &td->applications, list) {
 574                 if (application == tmp->application) {
 575                         if (!(td->mtclass.quirks & MT_QUIRK_SEPARATE_APP_REPORT) ||
 576                             tmp->report_id == report->id) {
 577                                 mt_application = tmp;
 578                                 break;
 579                         }
 580                 }
 581         }
 582 
 583         if (!mt_application)
 584                 mt_application = mt_allocate_application(td, report);
 585 
 586         return mt_application;
 587 }
 588 
 589 static struct mt_report_data *mt_allocate_report_data(struct mt_device *td,
 590                                                       struct hid_report *report)
 591 {
 592         struct mt_report_data *rdata;
 593         struct hid_field *field;
 594         int r, n;
 595 
 596         rdata = devm_kzalloc(&td->hdev->dev, sizeof(*rdata), GFP_KERNEL);
 597         if (!rdata)
 598                 return NULL;
 599 
 600         rdata->report = report;
 601         rdata->application = mt_find_application(td, report);
 602 
 603         if (!rdata->application) {
 604                 devm_kfree(&td->hdev->dev, rdata);
 605                 return NULL;
 606         }
 607 
 608         for (r = 0; r < report->maxfield; r++) {
 609                 field = report->field[r];
 610 
 611                 if (!(HID_MAIN_ITEM_VARIABLE & field->flags))
 612                         continue;
 613 
 614                 for (n = 0; n < field->report_count; n++) {
 615                         if (field->usage[n].hid == HID_DG_CONTACTID)
 616                                 rdata->is_mt_collection = true;
 617                 }
 618         }
 619 
 620         list_add_tail(&rdata->list, &td->reports);
 621 
 622         return rdata;
 623 }
 624 
 625 static struct mt_report_data *mt_find_report_data(struct mt_device *td,
 626                                                   struct hid_report *report)
 627 {
 628         struct mt_report_data *tmp, *rdata = NULL;
 629 
 630         list_for_each_entry(tmp, &td->reports, list) {
 631                 if (report == tmp->report) {
 632                         rdata = tmp;
 633                         break;
 634                 }
 635         }
 636 
 637         if (!rdata)
 638                 rdata = mt_allocate_report_data(td, report);
 639 
 640         return rdata;
 641 }
 642 
 643 static void mt_store_field(struct hid_device *hdev,
 644                            struct mt_application *application,
 645                            __s32 *value,
 646                            size_t offset)
 647 {
 648         struct mt_usages *usage;
 649         __s32 **target;
 650 
 651         if (list_empty(&application->mt_usages))
 652                 usage = mt_allocate_usage(hdev, application);
 653         else
 654                 usage = list_last_entry(&application->mt_usages,
 655                                         struct mt_usages,
 656                                         list);
 657 
 658         if (!usage)
 659                 return;
 660 
 661         target = (__s32 **)((char *)usage + offset);
 662 
 663         /* the value has already been filled, create a new slot */
 664         if (*target != DEFAULT_TRUE &&
 665             *target != DEFAULT_FALSE &&
 666             *target != DEFAULT_ZERO) {
 667                 if (usage->contactid == DEFAULT_ZERO ||
 668                     usage->x == DEFAULT_ZERO ||
 669                     usage->y == DEFAULT_ZERO) {
 670                         hid_dbg(hdev,
 671                                 "ignoring duplicate usage on incomplete");
 672                         return;
 673                 }
 674                 usage = mt_allocate_usage(hdev, application);
 675                 if (!usage)
 676                         return;
 677 
 678                 target = (__s32 **)((char *)usage + offset);
 679         }
 680 
 681         *target = value;
 682 }
 683 
 684 #define MT_STORE_FIELD(__name)                                          \
 685         mt_store_field(hdev, app,                                       \
 686                        &field->value[usage->usage_index],               \
 687                        offsetof(struct mt_usages, __name))
 688 
 689 static int mt_touch_input_mapping(struct hid_device *hdev, struct hid_input *hi,
 690                 struct hid_field *field, struct hid_usage *usage,
 691                 unsigned long **bit, int *max, struct mt_application *app)
 692 {
 693         struct mt_device *td = hid_get_drvdata(hdev);
 694         struct mt_class *cls = &td->mtclass;
 695         int code;
 696         struct hid_usage *prev_usage = NULL;
 697 
 698         /*
 699          * Model touchscreens providing buttons as touchpads.
 700          */
 701         if (field->application == HID_DG_TOUCHSCREEN &&
 702             (usage->hid & HID_USAGE_PAGE) == HID_UP_BUTTON) {
 703                 app->mt_flags |= INPUT_MT_POINTER;
 704                 td->inputmode_value = MT_INPUTMODE_TOUCHPAD;
 705         }
 706 
 707         /* count the buttons on touchpads */
 708         if ((usage->hid & HID_USAGE_PAGE) == HID_UP_BUTTON)
 709                 app->buttons_count++;
 710 
 711         if (usage->usage_index)
 712                 prev_usage = &field->usage[usage->usage_index - 1];
 713 
 714         switch (usage->hid & HID_USAGE_PAGE) {
 715 
 716         case HID_UP_GENDESK:
 717                 switch (usage->hid) {
 718                 case HID_GD_X:
 719                         if (prev_usage && (prev_usage->hid == usage->hid)) {
 720                                 code = ABS_MT_TOOL_X;
 721                                 MT_STORE_FIELD(cx);
 722                         } else {
 723                                 code = ABS_MT_POSITION_X;
 724                                 MT_STORE_FIELD(x);
 725                         }
 726 
 727                         set_abs(hi->input, code, field, cls->sn_move);
 728 
 729                         /*
 730                          * A system multi-axis that exports X and Y has a high
 731                          * chance of being used directly on a surface
 732                          */
 733                         if (field->application == HID_GD_SYSTEM_MULTIAXIS) {
 734                                 __set_bit(INPUT_PROP_DIRECT,
 735                                           hi->input->propbit);
 736                                 input_set_abs_params(hi->input,
 737                                                      ABS_MT_TOOL_TYPE,
 738                                                      MT_TOOL_DIAL,
 739                                                      MT_TOOL_DIAL, 0, 0);
 740                         }
 741 
 742                         return 1;
 743                 case HID_GD_Y:
 744                         if (prev_usage && (prev_usage->hid == usage->hid)) {
 745                                 code = ABS_MT_TOOL_Y;
 746                                 MT_STORE_FIELD(cy);
 747                         } else {
 748                                 code = ABS_MT_POSITION_Y;
 749                                 MT_STORE_FIELD(y);
 750                         }
 751 
 752                         set_abs(hi->input, code, field, cls->sn_move);
 753 
 754                         return 1;
 755                 }
 756                 return 0;
 757 
 758         case HID_UP_DIGITIZER:
 759                 switch (usage->hid) {
 760                 case HID_DG_INRANGE:
 761                         if (app->quirks & MT_QUIRK_HOVERING) {
 762                                 input_set_abs_params(hi->input,
 763                                         ABS_MT_DISTANCE, 0, 1, 0, 0);
 764                         }
 765                         MT_STORE_FIELD(inrange_state);
 766                         return 1;
 767                 case HID_DG_CONFIDENCE:
 768                         if ((cls->name == MT_CLS_WIN_8 ||
 769                                 cls->name == MT_CLS_WIN_8_DUAL) &&
 770                                 (field->application == HID_DG_TOUCHPAD ||
 771                                  field->application == HID_DG_TOUCHSCREEN))
 772                                 app->quirks |= MT_QUIRK_CONFIDENCE;
 773 
 774                         if (app->quirks & MT_QUIRK_CONFIDENCE)
 775                                 input_set_abs_params(hi->input,
 776                                                      ABS_MT_TOOL_TYPE,
 777                                                      MT_TOOL_FINGER,
 778                                                      MT_TOOL_PALM, 0, 0);
 779 
 780                         MT_STORE_FIELD(confidence_state);
 781                         return 1;
 782                 case HID_DG_TIPSWITCH:
 783                         if (field->application != HID_GD_SYSTEM_MULTIAXIS)
 784                                 input_set_capability(hi->input,
 785                                                      EV_KEY, BTN_TOUCH);
 786                         MT_STORE_FIELD(tip_state);
 787                         return 1;
 788                 case HID_DG_CONTACTID:
 789                         MT_STORE_FIELD(contactid);
 790                         app->touches_by_report++;
 791                         return 1;
 792                 case HID_DG_WIDTH:
 793                         if (!(app->quirks & MT_QUIRK_NO_AREA))
 794                                 set_abs(hi->input, ABS_MT_TOUCH_MAJOR, field,
 795                                         cls->sn_width);
 796                         MT_STORE_FIELD(w);
 797                         return 1;
 798                 case HID_DG_HEIGHT:
 799                         if (!(app->quirks & MT_QUIRK_NO_AREA)) {
 800                                 set_abs(hi->input, ABS_MT_TOUCH_MINOR, field,
 801                                         cls->sn_height);
 802 
 803                                 /*
 804                                  * Only set ABS_MT_ORIENTATION if it is not
 805                                  * already set by the HID_DG_AZIMUTH usage.
 806                                  */
 807                                 if (!test_bit(ABS_MT_ORIENTATION,
 808                                                 hi->input->absbit))
 809                                         input_set_abs_params(hi->input,
 810                                                 ABS_MT_ORIENTATION, 0, 1, 0, 0);
 811                         }
 812                         MT_STORE_FIELD(h);
 813                         return 1;
 814                 case HID_DG_TIPPRESSURE:
 815                         set_abs(hi->input, ABS_MT_PRESSURE, field,
 816                                 cls->sn_pressure);
 817                         MT_STORE_FIELD(p);
 818                         return 1;
 819                 case HID_DG_SCANTIME:
 820                         input_set_capability(hi->input, EV_MSC, MSC_TIMESTAMP);
 821                         app->scantime = &field->value[usage->usage_index];
 822                         app->scantime_logical_max = field->logical_maximum;
 823                         return 1;
 824                 case HID_DG_CONTACTCOUNT:
 825                         app->have_contact_count = true;
 826                         app->raw_cc = &field->value[usage->usage_index];
 827                         return 1;
 828                 case HID_DG_AZIMUTH:
 829                         /*
 830                          * Azimuth has the range of [0, MAX) representing a full
 831                          * revolution. Set ABS_MT_ORIENTATION to a quarter of
 832                          * MAX according the definition of ABS_MT_ORIENTATION
 833                          */
 834                         input_set_abs_params(hi->input, ABS_MT_ORIENTATION,
 835                                 -field->logical_maximum / 4,
 836                                 field->logical_maximum / 4,
 837                                 cls->sn_move ?
 838                                 field->logical_maximum / cls->sn_move : 0, 0);
 839                         MT_STORE_FIELD(a);
 840                         return 1;
 841                 case HID_DG_CONTACTMAX:
 842                         /* contact max are global to the report */
 843                         return -1;
 844                 case HID_DG_TOUCH:
 845                         /* Legacy devices use TIPSWITCH and not TOUCH.
 846                          * Let's just ignore this field. */
 847                         return -1;
 848                 }
 849                 /* let hid-input decide for the others */
 850                 return 0;
 851 
 852         case HID_UP_BUTTON:
 853                 code = BTN_MOUSE + ((usage->hid - 1) & HID_USAGE);
 854                 /*
 855                  * MS PTP spec says that external buttons left and right have
 856                  * usages 2 and 3.
 857                  */
 858                 if ((app->quirks & MT_QUIRK_WIN8_PTP_BUTTONS) &&
 859                     field->application == HID_DG_TOUCHPAD &&
 860                     (usage->hid & HID_USAGE) > 1)
 861                         code--;
 862 
 863                 if (field->application == HID_GD_SYSTEM_MULTIAXIS)
 864                         code = BTN_0  + ((usage->hid - 1) & HID_USAGE);
 865 
 866                 hid_map_usage(hi, usage, bit, max, EV_KEY, code);
 867                 input_set_capability(hi->input, EV_KEY, code);
 868                 return 1;
 869 
 870         case 0xff000000:
 871                 /* we do not want to map these: no input-oriented meaning */
 872                 return -1;
 873         }
 874 
 875         return 0;
 876 }
 877 
 878 static int mt_compute_slot(struct mt_device *td, struct mt_application *app,
 879                            struct mt_usages *slot,
 880                            struct input_dev *input)
 881 {
 882         __s32 quirks = app->quirks;
 883 
 884         if (quirks & MT_QUIRK_SLOT_IS_CONTACTID)
 885                 return *slot->contactid;
 886 
 887         if (quirks & MT_QUIRK_CYPRESS)
 888                 return cypress_compute_slot(app, slot);
 889 
 890         if (quirks & MT_QUIRK_SLOT_IS_CONTACTNUMBER)
 891                 return app->num_received;
 892 
 893         if (quirks & MT_QUIRK_SLOT_IS_CONTACTID_MINUS_ONE)
 894                 return *slot->contactid - 1;
 895 
 896         return input_mt_get_slot_by_key(input, *slot->contactid);
 897 }
 898 
 899 static void mt_release_pending_palms(struct mt_device *td,
 900                                      struct mt_application *app,
 901                                      struct input_dev *input)
 902 {
 903         int slotnum;
 904         bool need_sync = false;
 905 
 906         for_each_set_bit(slotnum, app->pending_palm_slots, td->maxcontacts) {
 907                 clear_bit(slotnum, app->pending_palm_slots);
 908 
 909                 input_mt_slot(input, slotnum);
 910                 input_mt_report_slot_state(input, MT_TOOL_PALM, false);
 911 
 912                 need_sync = true;
 913         }
 914 
 915         if (need_sync) {
 916                 input_mt_sync_frame(input);
 917                 input_sync(input);
 918         }
 919 }
 920 
 921 /*
 922  * this function is called when a whole packet has been received and processed,
 923  * so that it can decide what to send to the input layer.
 924  */
 925 static void mt_sync_frame(struct mt_device *td, struct mt_application *app,
 926                           struct input_dev *input)
 927 {
 928         if (app->quirks & MT_QUIRK_WIN8_PTP_BUTTONS)
 929                 input_event(input, EV_KEY, BTN_LEFT, app->left_button_state);
 930 
 931         input_mt_sync_frame(input);
 932         input_event(input, EV_MSC, MSC_TIMESTAMP, app->timestamp);
 933         input_sync(input);
 934 
 935         mt_release_pending_palms(td, app, input);
 936 
 937         app->num_received = 0;
 938         app->left_button_state = 0;
 939 
 940         if (test_bit(MT_IO_FLAGS_ACTIVE_SLOTS, &td->mt_io_flags))
 941                 set_bit(MT_IO_FLAGS_PENDING_SLOTS, &td->mt_io_flags);
 942         else
 943                 clear_bit(MT_IO_FLAGS_PENDING_SLOTS, &td->mt_io_flags);
 944         clear_bit(MT_IO_FLAGS_ACTIVE_SLOTS, &td->mt_io_flags);
 945 }
 946 
 947 static int mt_compute_timestamp(struct mt_application *app, __s32 value)
 948 {
 949         long delta = value - app->prev_scantime;
 950         unsigned long jdelta = jiffies_to_usecs(jiffies - app->jiffies);
 951 
 952         app->jiffies = jiffies;
 953 
 954         if (delta < 0)
 955                 delta += app->scantime_logical_max;
 956 
 957         /* HID_DG_SCANTIME is expressed in 100us, we want it in us. */
 958         delta *= 100;
 959 
 960         if (jdelta > MAX_TIMESTAMP_INTERVAL)
 961                 /* No data received for a while, resync the timestamp. */
 962                 return 0;
 963         else
 964                 return app->timestamp + delta;
 965 }
 966 
 967 static int mt_touch_event(struct hid_device *hid, struct hid_field *field,
 968                                 struct hid_usage *usage, __s32 value)
 969 {
 970         /* we will handle the hidinput part later, now remains hiddev */
 971         if (hid->claimed & HID_CLAIMED_HIDDEV && hid->hiddev_hid_event)
 972                 hid->hiddev_hid_event(hid, field, usage, value);
 973 
 974         return 1;
 975 }
 976 
 977 static int mt_process_slot(struct mt_device *td, struct input_dev *input,
 978                             struct mt_application *app,
 979                             struct mt_usages *slot)
 980 {
 981         struct input_mt *mt = input->mt;
 982         __s32 quirks = app->quirks;
 983         bool valid = true;
 984         bool confidence_state = true;
 985         bool inrange_state = false;
 986         int active;
 987         int slotnum;
 988         int tool = MT_TOOL_FINGER;
 989 
 990         if (!slot)
 991                 return -EINVAL;
 992 
 993         if ((quirks & MT_QUIRK_CONTACT_CNT_ACCURATE) &&
 994             app->num_received >= app->num_expected)
 995                 return -EAGAIN;
 996 
 997         if (!(quirks & MT_QUIRK_ALWAYS_VALID)) {
 998                 if (quirks & MT_QUIRK_VALID_IS_INRANGE)
 999                         valid = *slot->inrange_state;
1000                 if (quirks & MT_QUIRK_NOT_SEEN_MEANS_UP)
1001                         valid = *slot->tip_state;
1002                 if (quirks & MT_QUIRK_VALID_IS_CONFIDENCE)
1003                         valid = *slot->confidence_state;
1004 
1005                 if (!valid)
1006                         return 0;
1007         }
1008 
1009         slotnum = mt_compute_slot(td, app, slot, input);
1010         if (slotnum < 0 || slotnum >= td->maxcontacts)
1011                 return 0;
1012 
1013         if ((quirks & MT_QUIRK_IGNORE_DUPLICATES) && mt) {
1014                 struct input_mt_slot *i_slot = &mt->slots[slotnum];
1015 
1016                 if (input_mt_is_active(i_slot) &&
1017                     input_mt_is_used(mt, i_slot))
1018                         return -EAGAIN;
1019         }
1020 
1021         if (quirks & MT_QUIRK_CONFIDENCE)
1022                 confidence_state = *slot->confidence_state;
1023 
1024         if (quirks & MT_QUIRK_HOVERING)
1025                 inrange_state = *slot->inrange_state;
1026 
1027         active = *slot->tip_state || inrange_state;
1028 
1029         if (app->application == HID_GD_SYSTEM_MULTIAXIS)
1030                 tool = MT_TOOL_DIAL;
1031         else if (unlikely(!confidence_state)) {
1032                 tool = MT_TOOL_PALM;
1033                 if (!active && mt &&
1034                     input_mt_is_active(&mt->slots[slotnum])) {
1035                         /*
1036                          * The non-confidence was reported for
1037                          * previously valid contact that is also no
1038                          * longer valid. We can't simply report
1039                          * lift-off as userspace will not be aware
1040                          * of non-confidence, so we need to split
1041                          * it into 2 events: active MT_TOOL_PALM
1042                          * and a separate liftoff.
1043                          */
1044                         active = true;
1045                         set_bit(slotnum, app->pending_palm_slots);
1046                 }
1047         }
1048 
1049         input_mt_slot(input, slotnum);
1050         input_mt_report_slot_state(input, tool, active);
1051         if (active) {
1052                 /* this finger is in proximity of the sensor */
1053                 int wide = (*slot->w > *slot->h);
1054                 int major = max(*slot->w, *slot->h);
1055                 int minor = min(*slot->w, *slot->h);
1056                 int orientation = wide;
1057                 int max_azimuth;
1058                 int azimuth;
1059 
1060                 if (slot->a != DEFAULT_ZERO) {
1061                         /*
1062                          * Azimuth is counter-clockwise and ranges from [0, MAX)
1063                          * (a full revolution). Convert it to clockwise ranging
1064                          * [-MAX/2, MAX/2].
1065                          *
1066                          * Note that ABS_MT_ORIENTATION require us to report
1067                          * the limit of [-MAX/4, MAX/4], but the value can go
1068                          * out of range to [-MAX/2, MAX/2] to report an upside
1069                          * down ellipsis.
1070                          */
1071                         azimuth = *slot->a;
1072                         max_azimuth = input_abs_get_max(input,
1073                                                         ABS_MT_ORIENTATION);
1074                         if (azimuth > max_azimuth * 2)
1075                                 azimuth -= max_azimuth * 4;
1076                         orientation = -azimuth;
1077                 }
1078 
1079                 if (quirks & MT_QUIRK_TOUCH_SIZE_SCALING) {
1080                         /*
1081                          * divided by two to match visual scale of touch
1082                          * for devices with this quirk
1083                          */
1084                         major = major >> 1;
1085                         minor = minor >> 1;
1086                 }
1087 
1088                 input_event(input, EV_ABS, ABS_MT_POSITION_X, *slot->x);
1089                 input_event(input, EV_ABS, ABS_MT_POSITION_Y, *slot->y);
1090                 input_event(input, EV_ABS, ABS_MT_TOOL_X, *slot->cx);
1091                 input_event(input, EV_ABS, ABS_MT_TOOL_Y, *slot->cy);
1092                 input_event(input, EV_ABS, ABS_MT_DISTANCE, !*slot->tip_state);
1093                 input_event(input, EV_ABS, ABS_MT_ORIENTATION, orientation);
1094                 input_event(input, EV_ABS, ABS_MT_PRESSURE, *slot->p);
1095                 input_event(input, EV_ABS, ABS_MT_TOUCH_MAJOR, major);
1096                 input_event(input, EV_ABS, ABS_MT_TOUCH_MINOR, minor);
1097 
1098                 set_bit(MT_IO_FLAGS_ACTIVE_SLOTS, &td->mt_io_flags);
1099         }
1100 
1101         return 0;
1102 }
1103 
1104 static void mt_process_mt_event(struct hid_device *hid,
1105                                 struct mt_application *app,
1106                                 struct hid_field *field,
1107                                 struct hid_usage *usage,
1108                                 __s32 value,
1109                                 bool first_packet)
1110 {
1111         __s32 quirks = app->quirks;
1112         struct input_dev *input = field->hidinput->input;
1113 
1114         if (!usage->type || !(hid->claimed & HID_CLAIMED_INPUT))
1115                 return;
1116 
1117         if (quirks & MT_QUIRK_WIN8_PTP_BUTTONS) {
1118 
1119                 /*
1120                  * For Win8 PTP touchpads we should only look at
1121                  * non finger/touch events in the first_packet of a
1122                  * (possible) multi-packet frame.
1123                  */
1124                 if (!first_packet)
1125                         return;
1126 
1127                 /*
1128                  * For Win8 PTP touchpads we map both the clickpad click
1129                  * and any "external" left buttons to BTN_LEFT if a
1130                  * device claims to have both we need to report 1 for
1131                  * BTN_LEFT if either is pressed, so we or all values
1132                  * together and report the result in mt_sync_frame().
1133                  */
1134                 if (usage->type == EV_KEY && usage->code == BTN_LEFT) {
1135                         app->left_button_state |= value;
1136                         return;
1137                 }
1138         }
1139 
1140         input_event(input, usage->type, usage->code, value);
1141 }
1142 
1143 static void mt_touch_report(struct hid_device *hid,
1144                             struct mt_report_data *rdata)
1145 {
1146         struct mt_device *td = hid_get_drvdata(hid);
1147         struct hid_report *report = rdata->report;
1148         struct mt_application *app = rdata->application;
1149         struct hid_field *field;
1150         struct input_dev *input;
1151         struct mt_usages *slot;
1152         bool first_packet;
1153         unsigned count;
1154         int r, n;
1155         int scantime = 0;
1156         int contact_count = -1;
1157 
1158         /* sticky fingers release in progress, abort */
1159         if (test_and_set_bit(MT_IO_FLAGS_RUNNING, &td->mt_io_flags))
1160                 return;
1161 
1162         scantime = *app->scantime;
1163         app->timestamp = mt_compute_timestamp(app, scantime);
1164         if (app->raw_cc != DEFAULT_ZERO)
1165                 contact_count = *app->raw_cc;
1166 
1167         /*
1168          * Includes multi-packet support where subsequent
1169          * packets are sent with zero contactcount.
1170          */
1171         if (contact_count >= 0) {
1172                 /*
1173                  * For Win8 PTPs the first packet (td->num_received == 0) may
1174                  * have a contactcount of 0 if there only is a button event.
1175                  * We double check that this is not a continuation packet
1176                  * of a possible multi-packet frame be checking that the
1177                  * timestamp has changed.
1178                  */
1179                 if ((app->quirks & MT_QUIRK_WIN8_PTP_BUTTONS) &&
1180                     app->num_received == 0 &&
1181                     app->prev_scantime != scantime)
1182                         app->num_expected = contact_count;
1183                 /* A non 0 contact count always indicates a first packet */
1184                 else if (contact_count)
1185                         app->num_expected = contact_count;
1186         }
1187         app->prev_scantime = scantime;
1188 
1189         first_packet = app->num_received == 0;
1190 
1191         input = report->field[0]->hidinput->input;
1192 
1193         list_for_each_entry(slot, &app->mt_usages, list) {
1194                 if (!mt_process_slot(td, input, app, slot))
1195                         app->num_received++;
1196         }
1197 
1198         for (r = 0; r < report->maxfield; r++) {
1199                 field = report->field[r];
1200                 count = field->report_count;
1201 
1202                 if (!(HID_MAIN_ITEM_VARIABLE & field->flags))
1203                         continue;
1204 
1205                 for (n = 0; n < count; n++)
1206                         mt_process_mt_event(hid, app, field,
1207                                             &field->usage[n], field->value[n],
1208                                             first_packet);
1209         }
1210 
1211         if (app->num_received >= app->num_expected)
1212                 mt_sync_frame(td, app, input);
1213 
1214         /*
1215          * Windows 8 specs says 2 things:
1216          * - once a contact has been reported, it has to be reported in each
1217          *   subsequent report
1218          * - the report rate when fingers are present has to be at least
1219          *   the refresh rate of the screen, 60 or 120 Hz
1220          *
1221          * I interprete this that the specification forces a report rate of
1222          * at least 60 Hz for a touchscreen to be certified.
1223          * Which means that if we do not get a report whithin 16 ms, either
1224          * something wrong happens, either the touchscreen forgets to send
1225          * a release. Taking a reasonable margin allows to remove issues
1226          * with USB communication or the load of the machine.
1227          *
1228          * Given that Win 8 devices are forced to send a release, this will
1229          * only affect laggish machines and the ones that have a firmware
1230          * defect.
1231          */
1232         if (app->quirks & MT_QUIRK_STICKY_FINGERS) {
1233                 if (test_bit(MT_IO_FLAGS_PENDING_SLOTS, &td->mt_io_flags))
1234                         mod_timer(&td->release_timer,
1235                                   jiffies + msecs_to_jiffies(100));
1236                 else
1237                         del_timer(&td->release_timer);
1238         }
1239 
1240         clear_bit(MT_IO_FLAGS_RUNNING, &td->mt_io_flags);
1241 }
1242 
1243 static int mt_touch_input_configured(struct hid_device *hdev,
1244                                      struct hid_input *hi,
1245                                      struct mt_application *app)
1246 {
1247         struct mt_device *td = hid_get_drvdata(hdev);
1248         struct mt_class *cls = &td->mtclass;
1249         struct input_dev *input = hi->input;
1250         int ret;
1251 
1252         if (!td->maxcontacts)
1253                 td->maxcontacts = MT_DEFAULT_MAXCONTACT;
1254 
1255         mt_post_parse(td, app);
1256         if (td->serial_maybe)
1257                 mt_post_parse_default_settings(td, app);
1258 
1259         if (cls->is_indirect)
1260                 app->mt_flags |= INPUT_MT_POINTER;
1261 
1262         if (app->quirks & MT_QUIRK_NOT_SEEN_MEANS_UP)
1263                 app->mt_flags |= INPUT_MT_DROP_UNUSED;
1264 
1265         /* check for clickpads */
1266         if ((app->mt_flags & INPUT_MT_POINTER) &&
1267             (app->buttons_count == 1))
1268                 td->is_buttonpad = true;
1269 
1270         if (td->is_buttonpad)
1271                 __set_bit(INPUT_PROP_BUTTONPAD, input->propbit);
1272 
1273         app->pending_palm_slots = devm_kcalloc(&hi->input->dev,
1274                                                BITS_TO_LONGS(td->maxcontacts),
1275                                                sizeof(long),
1276                                                GFP_KERNEL);
1277         if (!app->pending_palm_slots)
1278                 return -ENOMEM;
1279 
1280         ret = input_mt_init_slots(input, td->maxcontacts, app->mt_flags);
1281         if (ret)
1282                 return ret;
1283 
1284         app->mt_flags = 0;
1285         return 0;
1286 }
1287 
1288 #define mt_map_key_clear(c)     hid_map_usage_clear(hi, usage, bit, \
1289                                                     max, EV_KEY, (c))
1290 static int mt_input_mapping(struct hid_device *hdev, struct hid_input *hi,
1291                 struct hid_field *field, struct hid_usage *usage,
1292                 unsigned long **bit, int *max)
1293 {
1294         struct mt_device *td = hid_get_drvdata(hdev);
1295         struct mt_application *application;
1296         struct mt_report_data *rdata;
1297 
1298         rdata = mt_find_report_data(td, field->report);
1299         if (!rdata) {
1300                 hid_err(hdev, "failed to allocate data for report\n");
1301                 return 0;
1302         }
1303 
1304         application = rdata->application;
1305 
1306         /*
1307          * If mtclass.export_all_inputs is not set, only map fields from
1308          * TouchScreen or TouchPad collections. We need to ignore fields
1309          * that belong to other collections such as Mouse that might have
1310          * the same GenericDesktop usages.
1311          */
1312         if (!td->mtclass.export_all_inputs &&
1313             field->application != HID_DG_TOUCHSCREEN &&
1314             field->application != HID_DG_PEN &&
1315             field->application != HID_DG_TOUCHPAD &&
1316             field->application != HID_GD_KEYBOARD &&
1317             field->application != HID_GD_SYSTEM_CONTROL &&
1318             field->application != HID_CP_CONSUMER_CONTROL &&
1319             field->application != HID_GD_WIRELESS_RADIO_CTLS &&
1320             field->application != HID_GD_SYSTEM_MULTIAXIS &&
1321             !(field->application == HID_VD_ASUS_CUSTOM_MEDIA_KEYS &&
1322               application->quirks & MT_QUIRK_ASUS_CUSTOM_UP))
1323                 return -1;
1324 
1325         /*
1326          * Some Asus keyboard+touchpad devices have the hotkeys defined in the
1327          * touchpad report descriptor. We need to treat these as an array to
1328          * map usages to input keys.
1329          */
1330         if (field->application == HID_VD_ASUS_CUSTOM_MEDIA_KEYS &&
1331             application->quirks & MT_QUIRK_ASUS_CUSTOM_UP &&
1332             (usage->hid & HID_USAGE_PAGE) == HID_UP_CUSTOM) {
1333                 set_bit(EV_REP, hi->input->evbit);
1334                 if (field->flags & HID_MAIN_ITEM_VARIABLE)
1335                         field->flags &= ~HID_MAIN_ITEM_VARIABLE;
1336                 switch (usage->hid & HID_USAGE) {
1337                 case 0x10: mt_map_key_clear(KEY_BRIGHTNESSDOWN);        break;
1338                 case 0x20: mt_map_key_clear(KEY_BRIGHTNESSUP);          break;
1339                 case 0x35: mt_map_key_clear(KEY_DISPLAY_OFF);           break;
1340                 case 0x6b: mt_map_key_clear(KEY_F21);                   break;
1341                 case 0x6c: mt_map_key_clear(KEY_SLEEP);                 break;
1342                 default:
1343                         return -1;
1344                 }
1345                 return 1;
1346         }
1347 
1348         if (rdata->is_mt_collection)
1349                 return mt_touch_input_mapping(hdev, hi, field, usage, bit, max,
1350                                               application);
1351 
1352         /*
1353          * some egalax touchscreens have "application == DG_TOUCHSCREEN"
1354          * for the stylus. Overwrite the hid_input application
1355          */
1356         if (field->physical == HID_DG_STYLUS)
1357                 hi->application = HID_DG_STYLUS;
1358 
1359         /* let hid-core decide for the others */
1360         return 0;
1361 }
1362 
1363 static int mt_input_mapped(struct hid_device *hdev, struct hid_input *hi,
1364                 struct hid_field *field, struct hid_usage *usage,
1365                 unsigned long **bit, int *max)
1366 {
1367         struct mt_device *td = hid_get_drvdata(hdev);
1368         struct mt_report_data *rdata;
1369 
1370         rdata = mt_find_report_data(td, field->report);
1371         if (rdata && rdata->is_mt_collection) {
1372                 /* We own these mappings, tell hid-input to ignore them */
1373                 return -1;
1374         }
1375 
1376         /* let hid-core decide for the others */
1377         return 0;
1378 }
1379 
1380 static int mt_event(struct hid_device *hid, struct hid_field *field,
1381                                 struct hid_usage *usage, __s32 value)
1382 {
1383         struct mt_device *td = hid_get_drvdata(hid);
1384         struct mt_report_data *rdata;
1385 
1386         rdata = mt_find_report_data(td, field->report);
1387         if (rdata && rdata->is_mt_collection)
1388                 return mt_touch_event(hid, field, usage, value);
1389 
1390         return 0;
1391 }
1392 
1393 static void mt_report(struct hid_device *hid, struct hid_report *report)
1394 {
1395         struct mt_device *td = hid_get_drvdata(hid);
1396         struct hid_field *field = report->field[0];
1397         struct mt_report_data *rdata;
1398 
1399         if (!(hid->claimed & HID_CLAIMED_INPUT))
1400                 return;
1401 
1402         rdata = mt_find_report_data(td, report);
1403         if (rdata && rdata->is_mt_collection)
1404                 return mt_touch_report(hid, rdata);
1405 
1406         if (field && field->hidinput && field->hidinput->input)
1407                 input_sync(field->hidinput->input);
1408 }
1409 
1410 static bool mt_need_to_apply_feature(struct hid_device *hdev,
1411                                      struct hid_field *field,
1412                                      struct hid_usage *usage,
1413                                      enum latency_mode latency,
1414                                      bool surface_switch,
1415                                      bool button_switch,
1416                                      bool *inputmode_found)
1417 {
1418         struct mt_device *td = hid_get_drvdata(hdev);
1419         struct mt_class *cls = &td->mtclass;
1420         struct hid_report *report = field->report;
1421         unsigned int index = usage->usage_index;
1422         char *buf;
1423         u32 report_len;
1424         int max;
1425 
1426         switch (usage->hid) {
1427         case HID_DG_INPUTMODE:
1428                 /*
1429                  * Some elan panels wrongly declare 2 input mode features,
1430                  * and silently ignore when we set the value in the second
1431                  * field. Skip the second feature and hope for the best.
1432                  */
1433                 if (*inputmode_found)
1434                         return false;
1435 
1436                 if (cls->quirks & MT_QUIRK_FORCE_GET_FEATURE) {
1437                         report_len = hid_report_len(report);
1438                         buf = hid_alloc_report_buf(report, GFP_KERNEL);
1439                         if (!buf) {
1440                                 hid_err(hdev,
1441                                         "failed to allocate buffer for report\n");
1442                                 return false;
1443                         }
1444                         hid_hw_raw_request(hdev, report->id, buf, report_len,
1445                                            HID_FEATURE_REPORT,
1446                                            HID_REQ_GET_REPORT);
1447                         kfree(buf);
1448                 }
1449 
1450                 field->value[index] = td->inputmode_value;
1451                 *inputmode_found = true;
1452                 return true;
1453 
1454         case HID_DG_CONTACTMAX:
1455                 if (cls->maxcontacts) {
1456                         max = min_t(int, field->logical_maximum,
1457                                     cls->maxcontacts);
1458                         if (field->value[index] != max) {
1459                                 field->value[index] = max;
1460                                 return true;
1461                         }
1462                 }
1463                 break;
1464 
1465         case HID_DG_LATENCYMODE:
1466                 field->value[index] = latency;
1467                 return true;
1468 
1469         case HID_DG_SURFACESWITCH:
1470                 field->value[index] = surface_switch;
1471                 return true;
1472 
1473         case HID_DG_BUTTONSWITCH:
1474                 field->value[index] = button_switch;
1475                 return true;
1476         }
1477 
1478         return false; /* no need to update the report */
1479 }
1480 
1481 static void mt_set_modes(struct hid_device *hdev, enum latency_mode latency,
1482                          bool surface_switch, bool button_switch)
1483 {
1484         struct hid_report_enum *rep_enum;
1485         struct hid_report *rep;
1486         struct hid_usage *usage;
1487         int i, j;
1488         bool update_report;
1489         bool inputmode_found = false;
1490 
1491         rep_enum = &hdev->report_enum[HID_FEATURE_REPORT];
1492         list_for_each_entry(rep, &rep_enum->report_list, list) {
1493                 update_report = false;
1494 
1495                 for (i = 0; i < rep->maxfield; i++) {
1496                         /* Ignore if report count is out of bounds. */
1497                         if (rep->field[i]->report_count < 1)
1498                                 continue;
1499 
1500                         for (j = 0; j < rep->field[i]->maxusage; j++) {
1501                                 usage = &rep->field[i]->usage[j];
1502 
1503                                 if (mt_need_to_apply_feature(hdev,
1504                                                              rep->field[i],
1505                                                              usage,
1506                                                              latency,
1507                                                              surface_switch,
1508                                                              button_switch,
1509                                                              &inputmode_found))
1510                                         update_report = true;
1511                         }
1512                 }
1513 
1514                 if (update_report)
1515                         hid_hw_request(hdev, rep, HID_REQ_SET_REPORT);
1516         }
1517 }
1518 
1519 static void mt_post_parse_default_settings(struct mt_device *td,
1520                                            struct mt_application *app)
1521 {
1522         __s32 quirks = app->quirks;
1523 
1524         /* unknown serial device needs special quirks */
1525         if (list_is_singular(&app->mt_usages)) {
1526                 quirks |= MT_QUIRK_ALWAYS_VALID;
1527                 quirks &= ~MT_QUIRK_NOT_SEEN_MEANS_UP;
1528                 quirks &= ~MT_QUIRK_VALID_IS_INRANGE;
1529                 quirks &= ~MT_QUIRK_VALID_IS_CONFIDENCE;
1530                 quirks &= ~MT_QUIRK_CONTACT_CNT_ACCURATE;
1531         }
1532 
1533         app->quirks = quirks;
1534 }
1535 
1536 static void mt_post_parse(struct mt_device *td, struct mt_application *app)
1537 {
1538         if (!app->have_contact_count)
1539                 app->quirks &= ~MT_QUIRK_CONTACT_CNT_ACCURATE;
1540 }
1541 
1542 static int mt_input_configured(struct hid_device *hdev, struct hid_input *hi)
1543 {
1544         struct mt_device *td = hid_get_drvdata(hdev);
1545         char *name;
1546         const char *suffix = NULL;
1547         struct mt_report_data *rdata;
1548         struct mt_application *mt_application = NULL;
1549         struct hid_report *report;
1550         int ret;
1551 
1552         list_for_each_entry(report, &hi->reports, hidinput_list) {
1553                 rdata = mt_find_report_data(td, report);
1554                 if (!rdata) {
1555                         hid_err(hdev, "failed to allocate data for report\n");
1556                         return -ENOMEM;
1557                 }
1558 
1559                 mt_application = rdata->application;
1560 
1561                 if (rdata->is_mt_collection) {
1562                         ret = mt_touch_input_configured(hdev, hi,
1563                                                         mt_application);
1564                         if (ret)
1565                                 return ret;
1566                 }
1567         }
1568 
1569         switch (hi->application) {
1570         case HID_GD_KEYBOARD:
1571         case HID_GD_KEYPAD:
1572         case HID_GD_MOUSE:
1573         case HID_DG_TOUCHPAD:
1574         case HID_GD_SYSTEM_CONTROL:
1575         case HID_CP_CONSUMER_CONTROL:
1576         case HID_GD_WIRELESS_RADIO_CTLS:
1577         case HID_GD_SYSTEM_MULTIAXIS:
1578                 /* already handled by hid core */
1579                 break;
1580         case HID_DG_TOUCHSCREEN:
1581                 /* we do not set suffix = "Touchscreen" */
1582                 hi->input->name = hdev->name;
1583                 break;
1584         case HID_DG_STYLUS:
1585                 /* force BTN_STYLUS to allow tablet matching in udev */
1586                 __set_bit(BTN_STYLUS, hi->input->keybit);
1587                 break;
1588         case HID_VD_ASUS_CUSTOM_MEDIA_KEYS:
1589                 suffix = "Custom Media Keys";
1590                 break;
1591         case HID_DG_PEN:
1592                 suffix = "Stylus";
1593                 break;
1594         default:
1595                 suffix = "UNKNOWN";
1596                 break;
1597         }
1598 
1599         if (suffix) {
1600                 name = devm_kzalloc(&hi->input->dev,
1601                                     strlen(hdev->name) + strlen(suffix) + 2,
1602                                     GFP_KERNEL);
1603                 if (name) {
1604                         sprintf(name, "%s %s", hdev->name, suffix);
1605                         hi->input->name = name;
1606                 }
1607         }
1608 
1609         return 0;
1610 }
1611 
1612 static void mt_fix_const_field(struct hid_field *field, unsigned int usage)
1613 {
1614         if (field->usage[0].hid != usage ||
1615             !(field->flags & HID_MAIN_ITEM_CONSTANT))
1616                 return;
1617 
1618         field->flags &= ~HID_MAIN_ITEM_CONSTANT;
1619         field->flags |= HID_MAIN_ITEM_VARIABLE;
1620 }
1621 
1622 static void mt_fix_const_fields(struct hid_device *hdev, unsigned int usage)
1623 {
1624         struct hid_report *report;
1625         int i;
1626 
1627         list_for_each_entry(report,
1628                             &hdev->report_enum[HID_INPUT_REPORT].report_list,
1629                             list) {
1630 
1631                 if (!report->maxfield)
1632                         continue;
1633 
1634                 for (i = 0; i < report->maxfield; i++)
1635                         if (report->field[i]->maxusage >= 1)
1636                                 mt_fix_const_field(report->field[i], usage);
1637         }
1638 }
1639 
1640 static void mt_release_contacts(struct hid_device *hid)
1641 {
1642         struct hid_input *hidinput;
1643         struct mt_application *application;
1644         struct mt_device *td = hid_get_drvdata(hid);
1645 
1646         list_for_each_entry(hidinput, &hid->inputs, list) {
1647                 struct input_dev *input_dev = hidinput->input;
1648                 struct input_mt *mt = input_dev->mt;
1649                 int i;
1650 
1651                 if (mt) {
1652                         for (i = 0; i < mt->num_slots; i++) {
1653                                 input_mt_slot(input_dev, i);
1654                                 input_mt_report_slot_state(input_dev,
1655                                                            MT_TOOL_FINGER,
1656                                                            false);
1657                         }
1658                         input_mt_sync_frame(input_dev);
1659                         input_sync(input_dev);
1660                 }
1661         }
1662 
1663         list_for_each_entry(application, &td->applications, list) {
1664                 application->num_received = 0;
1665         }
1666 }
1667 
1668 static void mt_expired_timeout(struct timer_list *t)
1669 {
1670         struct mt_device *td = from_timer(td, t, release_timer);
1671         struct hid_device *hdev = td->hdev;
1672 
1673         /*
1674          * An input report came in just before we release the sticky fingers,
1675          * it will take care of the sticky fingers.
1676          */
1677         if (test_and_set_bit(MT_IO_FLAGS_RUNNING, &td->mt_io_flags))
1678                 return;
1679         if (test_bit(MT_IO_FLAGS_PENDING_SLOTS, &td->mt_io_flags))
1680                 mt_release_contacts(hdev);
1681         clear_bit(MT_IO_FLAGS_RUNNING, &td->mt_io_flags);
1682 }
1683 
1684 static int mt_probe(struct hid_device *hdev, const struct hid_device_id *id)
1685 {
1686         int ret, i;
1687         struct mt_device *td;
1688         const struct mt_class *mtclass = mt_classes; /* MT_CLS_DEFAULT */
1689 
1690         for (i = 0; mt_classes[i].name ; i++) {
1691                 if (id->driver_data == mt_classes[i].name) {
1692                         mtclass = &(mt_classes[i]);
1693                         break;
1694                 }
1695         }
1696 
1697         td = devm_kzalloc(&hdev->dev, sizeof(struct mt_device), GFP_KERNEL);
1698         if (!td) {
1699                 dev_err(&hdev->dev, "cannot allocate multitouch data\n");
1700                 return -ENOMEM;
1701         }
1702         td->hdev = hdev;
1703         td->mtclass = *mtclass;
1704         td->inputmode_value = MT_INPUTMODE_TOUCHSCREEN;
1705         hid_set_drvdata(hdev, td);
1706 
1707         INIT_LIST_HEAD(&td->applications);
1708         INIT_LIST_HEAD(&td->reports);
1709 
1710         if (id->vendor == HID_ANY_ID && id->product == HID_ANY_ID)
1711                 td->serial_maybe = true;
1712 
1713         /* This allows the driver to correctly support devices
1714          * that emit events over several HID messages.
1715          */
1716         hdev->quirks |= HID_QUIRK_NO_INPUT_SYNC;
1717 
1718         /*
1719          * This allows the driver to handle different input sensors
1720          * that emits events through different applications on the same HID
1721          * device.
1722          */
1723         hdev->quirks |= HID_QUIRK_INPUT_PER_APP;
1724 
1725         if (id->group != HID_GROUP_MULTITOUCH_WIN_8)
1726                 hdev->quirks |= HID_QUIRK_MULTI_INPUT;
1727 
1728         if (mtclass->quirks & MT_QUIRK_FORCE_MULTI_INPUT) {
1729                 hdev->quirks &= ~HID_QUIRK_INPUT_PER_APP;
1730                 hdev->quirks |= HID_QUIRK_MULTI_INPUT;
1731         }
1732 
1733         timer_setup(&td->release_timer, mt_expired_timeout, 0);
1734 
1735         ret = hid_parse(hdev);
1736         if (ret != 0)
1737                 return ret;
1738 
1739         if (mtclass->quirks & MT_QUIRK_FIX_CONST_CONTACT_ID)
1740                 mt_fix_const_fields(hdev, HID_DG_CONTACTID);
1741 
1742         ret = hid_hw_start(hdev, HID_CONNECT_DEFAULT);
1743         if (ret)
1744                 return ret;
1745 
1746         ret = sysfs_create_group(&hdev->dev.kobj, &mt_attribute_group);
1747         if (ret)
1748                 dev_warn(&hdev->dev, "Cannot allocate sysfs group for %s\n",
1749                                 hdev->name);
1750 
1751         mt_set_modes(hdev, HID_LATENCY_NORMAL, true, true);
1752 
1753         return 0;
1754 }
1755 
1756 #ifdef CONFIG_PM
1757 static int mt_reset_resume(struct hid_device *hdev)
1758 {
1759         mt_release_contacts(hdev);
1760         mt_set_modes(hdev, HID_LATENCY_NORMAL, true, true);
1761         return 0;
1762 }
1763 
1764 static int mt_resume(struct hid_device *hdev)
1765 {
1766         /* Some Elan legacy devices require SET_IDLE to be set on resume.
1767          * It should be safe to send it to other devices too.
1768          * Tested on 3M, Stantum, Cypress, Zytronic, eGalax, and Elan panels. */
1769 
1770         hid_hw_idle(hdev, 0, 0, HID_REQ_SET_IDLE);
1771 
1772         return 0;
1773 }
1774 #endif
1775 
1776 static void mt_remove(struct hid_device *hdev)
1777 {
1778         struct mt_device *td = hid_get_drvdata(hdev);
1779 
1780         del_timer_sync(&td->release_timer);
1781 
1782         sysfs_remove_group(&hdev->dev.kobj, &mt_attribute_group);
1783         hid_hw_stop(hdev);
1784 }
1785 
1786 /*
1787  * This list contains only:
1788  * - VID/PID of products not working with the default multitouch handling
1789  * - 2 generic rules.
1790  * So there is no point in adding here any device with MT_CLS_DEFAULT.
1791  */
1792 static const struct hid_device_id mt_devices[] = {
1793 
1794         /* 3M panels */
1795         { .driver_data = MT_CLS_3M,
1796                 MT_USB_DEVICE(USB_VENDOR_ID_3M,
1797                         USB_DEVICE_ID_3M1968) },
1798         { .driver_data = MT_CLS_3M,
1799                 MT_USB_DEVICE(USB_VENDOR_ID_3M,
1800                         USB_DEVICE_ID_3M2256) },
1801         { .driver_data = MT_CLS_3M,
1802                 MT_USB_DEVICE(USB_VENDOR_ID_3M,
1803                         USB_DEVICE_ID_3M3266) },
1804 
1805         /* Alps devices */
1806         { .driver_data = MT_CLS_WIN_8_DUAL,
1807                 HID_DEVICE(BUS_I2C, HID_GROUP_MULTITOUCH_WIN_8,
1808                         USB_VENDOR_ID_ALPS_JP,
1809                         HID_DEVICE_ID_ALPS_U1_DUAL_PTP) },
1810         { .driver_data = MT_CLS_WIN_8_DUAL,
1811                 HID_DEVICE(BUS_I2C, HID_GROUP_MULTITOUCH_WIN_8,
1812                         USB_VENDOR_ID_ALPS_JP,
1813                         HID_DEVICE_ID_ALPS_U1_DUAL_3BTN_PTP) },
1814         { .driver_data = MT_CLS_WIN_8_DUAL,
1815                 HID_DEVICE(BUS_I2C, HID_GROUP_MULTITOUCH_WIN_8,
1816                         USB_VENDOR_ID_ALPS_JP,
1817                         HID_DEVICE_ID_ALPS_1222) },
1818 
1819         /* Lenovo X1 TAB Gen 2 */
1820         { .driver_data = MT_CLS_WIN_8_DUAL,
1821                 HID_DEVICE(BUS_USB, HID_GROUP_MULTITOUCH_WIN_8,
1822                            USB_VENDOR_ID_LENOVO,
1823                            USB_DEVICE_ID_LENOVO_X1_TAB) },
1824 
1825         /* Lenovo X1 TAB Gen 3 */
1826         { .driver_data = MT_CLS_WIN_8_DUAL,
1827                 HID_DEVICE(BUS_USB, HID_GROUP_MULTITOUCH_WIN_8,
1828                            USB_VENDOR_ID_LENOVO,
1829                            USB_DEVICE_ID_LENOVO_X1_TAB3) },
1830 
1831         /* Anton devices */
1832         { .driver_data = MT_CLS_EXPORT_ALL_INPUTS,
1833                 MT_USB_DEVICE(USB_VENDOR_ID_ANTON,
1834                         USB_DEVICE_ID_ANTON_TOUCH_PAD) },
1835 
1836         /* Asus T304UA */
1837         { .driver_data = MT_CLS_ASUS,
1838                 HID_DEVICE(BUS_USB, HID_GROUP_MULTITOUCH_WIN_8,
1839                         USB_VENDOR_ID_ASUSTEK,
1840                         USB_DEVICE_ID_ASUSTEK_T304_KEYBOARD) },
1841 
1842         /* Atmel panels */
1843         { .driver_data = MT_CLS_SERIAL,
1844                 MT_USB_DEVICE(USB_VENDOR_ID_ATMEL,
1845                         USB_DEVICE_ID_ATMEL_MXT_DIGITIZER) },
1846 
1847         /* Baanto multitouch devices */
1848         { .driver_data = MT_CLS_NSMU,
1849                 MT_USB_DEVICE(USB_VENDOR_ID_BAANTO,
1850                         USB_DEVICE_ID_BAANTO_MT_190W2) },
1851 
1852         /* Cando panels */
1853         { .driver_data = MT_CLS_DUAL_INRANGE_CONTACTNUMBER,
1854                 MT_USB_DEVICE(USB_VENDOR_ID_CANDO,
1855                         USB_DEVICE_ID_CANDO_MULTI_TOUCH) },
1856         { .driver_data = MT_CLS_DUAL_INRANGE_CONTACTNUMBER,
1857                 MT_USB_DEVICE(USB_VENDOR_ID_CANDO,
1858                         USB_DEVICE_ID_CANDO_MULTI_TOUCH_15_6) },
1859 
1860         /* Chunghwa Telecom touch panels */
1861         {  .driver_data = MT_CLS_NSMU,
1862                 MT_USB_DEVICE(USB_VENDOR_ID_CHUNGHWAT,
1863                         USB_DEVICE_ID_CHUNGHWAT_MULTITOUCH) },
1864 
1865         /* Cirque devices */
1866         { .driver_data = MT_CLS_WIN_8_DUAL,
1867                 HID_DEVICE(BUS_I2C, HID_GROUP_MULTITOUCH_WIN_8,
1868                         I2C_VENDOR_ID_CIRQUE,
1869                         I2C_PRODUCT_ID_CIRQUE_121F) },
1870 
1871         /* CJTouch panels */
1872         { .driver_data = MT_CLS_NSMU,
1873                 MT_USB_DEVICE(USB_VENDOR_ID_CJTOUCH,
1874                         USB_DEVICE_ID_CJTOUCH_MULTI_TOUCH_0020) },
1875         { .driver_data = MT_CLS_NSMU,
1876                 MT_USB_DEVICE(USB_VENDOR_ID_CJTOUCH,
1877                         USB_DEVICE_ID_CJTOUCH_MULTI_TOUCH_0040) },
1878 
1879         /* CVTouch panels */
1880         { .driver_data = MT_CLS_NSMU,
1881                 MT_USB_DEVICE(USB_VENDOR_ID_CVTOUCH,
1882                         USB_DEVICE_ID_CVTOUCH_SCREEN) },
1883 
1884         /* eGalax devices (resistive) */
1885         { .driver_data = MT_CLS_EGALAX,
1886                 MT_USB_DEVICE(USB_VENDOR_ID_DWAV,
1887                         USB_DEVICE_ID_DWAV_EGALAX_MULTITOUCH_480D) },
1888         { .driver_data = MT_CLS_EGALAX,
1889                 MT_USB_DEVICE(USB_VENDOR_ID_DWAV,
1890                         USB_DEVICE_ID_DWAV_EGALAX_MULTITOUCH_480E) },
1891 
1892         /* eGalax devices (capacitive) */
1893         { .driver_data = MT_CLS_EGALAX_SERIAL,
1894                 MT_USB_DEVICE(USB_VENDOR_ID_DWAV,
1895                         USB_DEVICE_ID_DWAV_EGALAX_MULTITOUCH_7207) },
1896         { .driver_data = MT_CLS_EGALAX,
1897                 MT_USB_DEVICE(USB_VENDOR_ID_DWAV,
1898                         USB_DEVICE_ID_DWAV_EGALAX_MULTITOUCH_720C) },
1899         { .driver_data = MT_CLS_EGALAX_SERIAL,
1900                 MT_USB_DEVICE(USB_VENDOR_ID_DWAV,
1901                         USB_DEVICE_ID_DWAV_EGALAX_MULTITOUCH_7224) },
1902         { .driver_data = MT_CLS_EGALAX_SERIAL,
1903                 MT_USB_DEVICE(USB_VENDOR_ID_DWAV,
1904                         USB_DEVICE_ID_DWAV_EGALAX_MULTITOUCH_722A) },
1905         { .driver_data = MT_CLS_EGALAX_SERIAL,
1906                 MT_USB_DEVICE(USB_VENDOR_ID_DWAV,
1907                         USB_DEVICE_ID_DWAV_EGALAX_MULTITOUCH_725E) },
1908         { .driver_data = MT_CLS_EGALAX_SERIAL,
1909                 MT_USB_DEVICE(USB_VENDOR_ID_DWAV,
1910                         USB_DEVICE_ID_DWAV_EGALAX_MULTITOUCH_7262) },
1911         { .driver_data = MT_CLS_EGALAX,
1912                 MT_USB_DEVICE(USB_VENDOR_ID_DWAV,
1913                         USB_DEVICE_ID_DWAV_EGALAX_MULTITOUCH_726B) },
1914         { .driver_data = MT_CLS_EGALAX,
1915                 MT_USB_DEVICE(USB_VENDOR_ID_DWAV,
1916                         USB_DEVICE_ID_DWAV_EGALAX_MULTITOUCH_72A1) },
1917         { .driver_data = MT_CLS_EGALAX_SERIAL,
1918                 MT_USB_DEVICE(USB_VENDOR_ID_DWAV,
1919                         USB_DEVICE_ID_DWAV_EGALAX_MULTITOUCH_72AA) },
1920         { .driver_data = MT_CLS_EGALAX,
1921                 HID_USB_DEVICE(USB_VENDOR_ID_DWAV,
1922                         USB_DEVICE_ID_DWAV_EGALAX_MULTITOUCH_72C4) },
1923         { .driver_data = MT_CLS_EGALAX,
1924                 HID_USB_DEVICE(USB_VENDOR_ID_DWAV,
1925                         USB_DEVICE_ID_DWAV_EGALAX_MULTITOUCH_72D0) },
1926         { .driver_data = MT_CLS_EGALAX,
1927                 MT_USB_DEVICE(USB_VENDOR_ID_DWAV,
1928                         USB_DEVICE_ID_DWAV_EGALAX_MULTITOUCH_72FA) },
1929         { .driver_data = MT_CLS_EGALAX,
1930                 MT_USB_DEVICE(USB_VENDOR_ID_DWAV,
1931                         USB_DEVICE_ID_DWAV_EGALAX_MULTITOUCH_7302) },
1932         { .driver_data = MT_CLS_EGALAX_SERIAL,
1933                 MT_USB_DEVICE(USB_VENDOR_ID_DWAV,
1934                         USB_DEVICE_ID_DWAV_EGALAX_MULTITOUCH_7349) },
1935         { .driver_data = MT_CLS_EGALAX_SERIAL,
1936                 MT_USB_DEVICE(USB_VENDOR_ID_DWAV,
1937                         USB_DEVICE_ID_DWAV_EGALAX_MULTITOUCH_73F7) },
1938         { .driver_data = MT_CLS_EGALAX_SERIAL,
1939                 MT_USB_DEVICE(USB_VENDOR_ID_DWAV,
1940                         USB_DEVICE_ID_DWAV_EGALAX_MULTITOUCH_A001) },
1941         { .driver_data = MT_CLS_EGALAX,
1942                 MT_USB_DEVICE(USB_VENDOR_ID_DWAV,
1943                         USB_DEVICE_ID_DWAV_EGALAX_MULTITOUCH_C002) },
1944 
1945         /* Elan devices */
1946         { .driver_data = MT_CLS_WIN_8_FORCE_MULTI_INPUT,
1947                 HID_DEVICE(BUS_I2C, HID_GROUP_MULTITOUCH_WIN_8,
1948                         USB_VENDOR_ID_ELAN, 0x313a) },
1949 
1950         /* Elitegroup panel */
1951         { .driver_data = MT_CLS_SERIAL,
1952                 MT_USB_DEVICE(USB_VENDOR_ID_ELITEGROUP,
1953                         USB_DEVICE_ID_ELITEGROUP_05D8) },
1954 
1955         /* Flatfrog Panels */
1956         { .driver_data = MT_CLS_FLATFROG,
1957                 MT_USB_DEVICE(USB_VENDOR_ID_FLATFROG,
1958                         USB_DEVICE_ID_MULTITOUCH_3200) },
1959 
1960         /* FocalTech Panels */
1961         { .driver_data = MT_CLS_SERIAL,
1962                 MT_USB_DEVICE(USB_VENDOR_ID_CYGNAL,
1963                         USB_DEVICE_ID_FOCALTECH_FTXXXX_MULTITOUCH) },
1964 
1965         /* GeneralTouch panel */
1966         { .driver_data = MT_CLS_GENERALTOUCH_TWOFINGERS,
1967                 MT_USB_DEVICE(USB_VENDOR_ID_GENERAL_TOUCH,
1968                         USB_DEVICE_ID_GENERAL_TOUCH_WIN7_TWOFINGERS) },
1969         { .driver_data = MT_CLS_GENERALTOUCH_PWT_TENFINGERS,
1970                 MT_USB_DEVICE(USB_VENDOR_ID_GENERAL_TOUCH,
1971                         USB_DEVICE_ID_GENERAL_TOUCH_WIN8_PWT_TENFINGERS) },
1972         { .driver_data = MT_CLS_GENERALTOUCH_TWOFINGERS,
1973                 MT_USB_DEVICE(USB_VENDOR_ID_GENERAL_TOUCH,
1974                         USB_DEVICE_ID_GENERAL_TOUCH_WIN8_PIT_0101) },
1975         { .driver_data = MT_CLS_GENERALTOUCH_PWT_TENFINGERS,
1976                 MT_USB_DEVICE(USB_VENDOR_ID_GENERAL_TOUCH,
1977                         USB_DEVICE_ID_GENERAL_TOUCH_WIN8_PIT_0102) },
1978         { .driver_data = MT_CLS_GENERALTOUCH_PWT_TENFINGERS,
1979                 MT_USB_DEVICE(USB_VENDOR_ID_GENERAL_TOUCH,
1980                         USB_DEVICE_ID_GENERAL_TOUCH_WIN8_PIT_0106) },
1981         { .driver_data = MT_CLS_GENERALTOUCH_PWT_TENFINGERS,
1982                 MT_USB_DEVICE(USB_VENDOR_ID_GENERAL_TOUCH,
1983                         USB_DEVICE_ID_GENERAL_TOUCH_WIN8_PIT_010A) },
1984         { .driver_data = MT_CLS_GENERALTOUCH_PWT_TENFINGERS,
1985                 MT_USB_DEVICE(USB_VENDOR_ID_GENERAL_TOUCH,
1986                         USB_DEVICE_ID_GENERAL_TOUCH_WIN8_PIT_E100) },
1987 
1988         /* Gametel game controller */
1989         { .driver_data = MT_CLS_NSMU,
1990                 MT_BT_DEVICE(USB_VENDOR_ID_FRUCTEL,
1991                         USB_DEVICE_ID_GAMETEL_MT_MODE) },
1992 
1993         /* GoodTouch panels */
1994         { .driver_data = MT_CLS_NSMU,
1995                 MT_USB_DEVICE(USB_VENDOR_ID_GOODTOUCH,
1996                         USB_DEVICE_ID_GOODTOUCH_000f) },
1997 
1998         /* Hanvon panels */
1999         { .driver_data = MT_CLS_DUAL_INRANGE_CONTACTID,
2000                 MT_USB_DEVICE(USB_VENDOR_ID_HANVON_ALT,
2001                         USB_DEVICE_ID_HANVON_ALT_MULTITOUCH) },
2002 
2003         /* Ilitek dual touch panel */
2004         {  .driver_data = MT_CLS_NSMU,
2005                 MT_USB_DEVICE(USB_VENDOR_ID_ILITEK,
2006                         USB_DEVICE_ID_ILITEK_MULTITOUCH) },
2007 
2008         /* LG Melfas panel */
2009         { .driver_data = MT_CLS_LG,
2010                 HID_USB_DEVICE(USB_VENDOR_ID_LG,
2011                         USB_DEVICE_ID_LG_MELFAS_MT) },
2012         { .driver_data = MT_CLS_LG,
2013                 HID_DEVICE(BUS_I2C, HID_GROUP_GENERIC,
2014                         USB_VENDOR_ID_LG, I2C_DEVICE_ID_LG_7010) },
2015 
2016         /* MosArt panels */
2017         { .driver_data = MT_CLS_CONFIDENCE_MINUS_ONE,
2018                 MT_USB_DEVICE(USB_VENDOR_ID_ASUS,
2019                         USB_DEVICE_ID_ASUS_T91MT)},
2020         { .driver_data = MT_CLS_CONFIDENCE_MINUS_ONE,
2021                 MT_USB_DEVICE(USB_VENDOR_ID_ASUS,
2022                         USB_DEVICE_ID_ASUSTEK_MULTITOUCH_YFO) },
2023         { .driver_data = MT_CLS_CONFIDENCE_MINUS_ONE,
2024                 MT_USB_DEVICE(USB_VENDOR_ID_TURBOX,
2025                         USB_DEVICE_ID_TURBOX_TOUCHSCREEN_MOSART) },
2026 
2027         /* Novatek Panel */
2028         { .driver_data = MT_CLS_NSMU,
2029                 MT_USB_DEVICE(USB_VENDOR_ID_NOVATEK,
2030                         USB_DEVICE_ID_NOVATEK_PCT) },
2031 
2032         /* Ntrig Panel */
2033         { .driver_data = MT_CLS_NSMU,
2034                 HID_DEVICE(BUS_I2C, HID_GROUP_MULTITOUCH_WIN_8,
2035                         USB_VENDOR_ID_NTRIG, 0x1b05) },
2036 
2037         /* Panasonic panels */
2038         { .driver_data = MT_CLS_PANASONIC,
2039                 MT_USB_DEVICE(USB_VENDOR_ID_PANASONIC,
2040                         USB_DEVICE_ID_PANABOARD_UBT780) },
2041         { .driver_data = MT_CLS_PANASONIC,
2042                 MT_USB_DEVICE(USB_VENDOR_ID_PANASONIC,
2043                         USB_DEVICE_ID_PANABOARD_UBT880) },
2044 
2045         /* PixArt optical touch screen */
2046         { .driver_data = MT_CLS_INRANGE_CONTACTNUMBER,
2047                 MT_USB_DEVICE(USB_VENDOR_ID_PIXART,
2048                         USB_DEVICE_ID_PIXART_OPTICAL_TOUCH_SCREEN) },
2049         { .driver_data = MT_CLS_INRANGE_CONTACTNUMBER,
2050                 MT_USB_DEVICE(USB_VENDOR_ID_PIXART,
2051                         USB_DEVICE_ID_PIXART_OPTICAL_TOUCH_SCREEN1) },
2052         { .driver_data = MT_CLS_INRANGE_CONTACTNUMBER,
2053                 MT_USB_DEVICE(USB_VENDOR_ID_PIXART,
2054                         USB_DEVICE_ID_PIXART_OPTICAL_TOUCH_SCREEN2) },
2055 
2056         /* PixCir-based panels */
2057         { .driver_data = MT_CLS_DUAL_INRANGE_CONTACTID,
2058                 MT_USB_DEVICE(USB_VENDOR_ID_CANDO,
2059                         USB_DEVICE_ID_CANDO_PIXCIR_MULTI_TOUCH) },
2060 
2061         /* Quanta-based panels */
2062         { .driver_data = MT_CLS_CONFIDENCE_CONTACT_ID,
2063                 MT_USB_DEVICE(USB_VENDOR_ID_QUANTA,
2064                         USB_DEVICE_ID_QUANTA_OPTICAL_TOUCH_3001) },
2065 
2066         /* Razer touchpads */
2067         { .driver_data = MT_CLS_RAZER_BLADE_STEALTH,
2068                 HID_DEVICE(BUS_I2C, HID_GROUP_MULTITOUCH_WIN_8,
2069                         USB_VENDOR_ID_SYNAPTICS, 0x8323) },
2070 
2071         /* Smart Tech panels */
2072         { .driver_data = MT_CLS_SMART_TECH,
2073                 MT_USB_DEVICE(0x0b8c, 0x0092)},
2074 
2075         /* Stantum panels */
2076         { .driver_data = MT_CLS_CONFIDENCE,
2077                 MT_USB_DEVICE(USB_VENDOR_ID_STANTUM_STM,
2078                         USB_DEVICE_ID_MTP_STM)},
2079 
2080         /* Synaptics devices */
2081         { .driver_data = MT_CLS_WIN_8_FORCE_MULTI_INPUT,
2082                 HID_DEVICE(BUS_I2C, HID_GROUP_MULTITOUCH_WIN_8,
2083                         USB_VENDOR_ID_SYNAPTICS, 0xce08) },
2084 
2085         /* TopSeed panels */
2086         { .driver_data = MT_CLS_TOPSEED,
2087                 MT_USB_DEVICE(USB_VENDOR_ID_TOPSEED2,
2088                         USB_DEVICE_ID_TOPSEED2_PERIPAD_701) },
2089 
2090         /* Touch International panels */
2091         { .driver_data = MT_CLS_NSMU,
2092                 MT_USB_DEVICE(USB_VENDOR_ID_TOUCH_INTL,
2093                         USB_DEVICE_ID_TOUCH_INTL_MULTI_TOUCH) },
2094 
2095         /* Unitec panels */
2096         { .driver_data = MT_CLS_NSMU,
2097                 MT_USB_DEVICE(USB_VENDOR_ID_UNITEC,
2098                         USB_DEVICE_ID_UNITEC_USB_TOUCH_0709) },
2099         { .driver_data = MT_CLS_NSMU,
2100                 MT_USB_DEVICE(USB_VENDOR_ID_UNITEC,
2101                         USB_DEVICE_ID_UNITEC_USB_TOUCH_0A19) },
2102 
2103         /* VTL panels */
2104         { .driver_data = MT_CLS_VTL,
2105                 MT_USB_DEVICE(USB_VENDOR_ID_VTL,
2106                         USB_DEVICE_ID_VTL_MULTITOUCH_FF3F) },
2107 
2108         /* Wistron panels */
2109         { .driver_data = MT_CLS_NSMU,
2110                 MT_USB_DEVICE(USB_VENDOR_ID_WISTRON,
2111                         USB_DEVICE_ID_WISTRON_OPTICAL_TOUCH) },
2112 
2113         /* XAT */
2114         { .driver_data = MT_CLS_NSMU,
2115                 MT_USB_DEVICE(USB_VENDOR_ID_XAT,
2116                         USB_DEVICE_ID_XAT_CSR) },
2117 
2118         /* Xiroku */
2119         { .driver_data = MT_CLS_NSMU,
2120                 MT_USB_DEVICE(USB_VENDOR_ID_XIROKU,
2121                         USB_DEVICE_ID_XIROKU_SPX) },
2122         { .driver_data = MT_CLS_NSMU,
2123                 MT_USB_DEVICE(USB_VENDOR_ID_XIROKU,
2124                         USB_DEVICE_ID_XIROKU_MPX) },
2125         { .driver_data = MT_CLS_NSMU,
2126                 MT_USB_DEVICE(USB_VENDOR_ID_XIROKU,
2127                         USB_DEVICE_ID_XIROKU_CSR) },
2128         { .driver_data = MT_CLS_NSMU,
2129                 MT_USB_DEVICE(USB_VENDOR_ID_XIROKU,
2130                         USB_DEVICE_ID_XIROKU_SPX1) },
2131         { .driver_data = MT_CLS_NSMU,
2132                 MT_USB_DEVICE(USB_VENDOR_ID_XIROKU,
2133                         USB_DEVICE_ID_XIROKU_MPX1) },
2134         { .driver_data = MT_CLS_NSMU,
2135                 MT_USB_DEVICE(USB_VENDOR_ID_XIROKU,
2136                         USB_DEVICE_ID_XIROKU_CSR1) },
2137         { .driver_data = MT_CLS_NSMU,
2138                 MT_USB_DEVICE(USB_VENDOR_ID_XIROKU,
2139                         USB_DEVICE_ID_XIROKU_SPX2) },
2140         { .driver_data = MT_CLS_NSMU,
2141                 MT_USB_DEVICE(USB_VENDOR_ID_XIROKU,
2142                         USB_DEVICE_ID_XIROKU_MPX2) },
2143         { .driver_data = MT_CLS_NSMU,
2144                 MT_USB_DEVICE(USB_VENDOR_ID_XIROKU,
2145                         USB_DEVICE_ID_XIROKU_CSR2) },
2146 
2147         /* Google MT devices */
2148         { .driver_data = MT_CLS_GOOGLE,
2149                 HID_DEVICE(HID_BUS_ANY, HID_GROUP_ANY, USB_VENDOR_ID_GOOGLE,
2150                         USB_DEVICE_ID_GOOGLE_TOUCH_ROSE) },
2151 
2152         /* Generic MT device */
2153         { HID_DEVICE(HID_BUS_ANY, HID_GROUP_MULTITOUCH, HID_ANY_ID, HID_ANY_ID) },
2154 
2155         /* Generic Win 8 certified MT device */
2156         {  .driver_data = MT_CLS_WIN_8,
2157                 HID_DEVICE(HID_BUS_ANY, HID_GROUP_MULTITOUCH_WIN_8,
2158                         HID_ANY_ID, HID_ANY_ID) },
2159         { }
2160 };
2161 MODULE_DEVICE_TABLE(hid, mt_devices);
2162 
2163 static const struct hid_usage_id mt_grabbed_usages[] = {
2164         { HID_ANY_ID, HID_ANY_ID, HID_ANY_ID },
2165         { HID_ANY_ID - 1, HID_ANY_ID - 1, HID_ANY_ID - 1}
2166 };
2167 
2168 static struct hid_driver mt_driver = {
2169         .name = "hid-multitouch",
2170         .id_table = mt_devices,
2171         .probe = mt_probe,
2172         .remove = mt_remove,
2173         .input_mapping = mt_input_mapping,
2174         .input_mapped = mt_input_mapped,
2175         .input_configured = mt_input_configured,
2176         .feature_mapping = mt_feature_mapping,
2177         .usage_table = mt_grabbed_usages,
2178         .event = mt_event,
2179         .report = mt_report,
2180 #ifdef CONFIG_PM
2181         .reset_resume = mt_reset_resume,
2182         .resume = mt_resume,
2183 #endif
2184 };
2185 module_hid_driver(mt_driver);
/* [<][>][^][v][top][bottom][index][help] */
root/drivers/hid/hid-multitouch.c

DEFINITIONS
