drivers/hid/hid-input.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  *  Copyright (c) 2000-2001 Vojtech Pavlik
   4  *  Copyright (c) 2006-2010 Jiri Kosina
   5  *
   6  *  HID to Linux Input mapping
   7  */
   8
   9 /*
  10  *
  11  * Should you need to contact me, the author, you can do so either by
  12  * e-mail - mail your message to <vojtech@ucw.cz>, or by paper mail:
  13  * Vojtech Pavlik, Simunkova 1594, Prague 8, 182 00 Czech Republic
  14  */
  15
  16 #include <linux/module.h>
  17 #include <linux/slab.h>
  18 #include <linux/kernel.h>
  19
  20 #include <linux/hid.h>
  21 #include <linux/hid-debug.h>
  22
  23 #include "hid-ids.h"
  24
  25 #define unk     KEY_UNKNOWN
  26
  27 static const unsigned char hid_keyboard[256] = {
  28           0,  0,  0,  0, 30, 48, 46, 32, 18, 33, 34, 35, 23, 36, 37, 38,
  29          50, 49, 24, 25, 16, 19, 31, 20, 22, 47, 17, 45, 21, 44,  2,  3,
  30           4,  5,  6,  7,  8,  9, 10, 11, 28,  1, 14, 15, 57, 12, 13, 26,
  31          27, 43, 43, 39, 40, 41, 51, 52, 53, 58, 59, 60, 61, 62, 63, 64,
  32          65, 66, 67, 68, 87, 88, 99, 70,119,110,102,104,111,107,109,106,
  33         105,108,103, 69, 98, 55, 74, 78, 96, 79, 80, 81, 75, 76, 77, 71,
  34          72, 73, 82, 83, 86,127,116,117,183,184,185,186,187,188,189,190,
  35         191,192,193,194,134,138,130,132,128,129,131,137,133,135,136,113,
  36         115,114,unk,unk,unk,121,unk, 89, 93,124, 92, 94, 95,unk,unk,unk,
  37         122,123, 90, 91, 85,unk,unk,unk,unk,unk,unk,unk,111,unk,unk,unk,
  38         unk,unk,unk,unk,unk,unk,unk,unk,unk,unk,unk,unk,unk,unk,unk,unk,
  39         unk,unk,unk,unk,unk,unk,179,180,unk,unk,unk,unk,unk,unk,unk,unk,
  40         unk,unk,unk,unk,unk,unk,unk,unk,unk,unk,unk,unk,unk,unk,unk,unk,
  41         unk,unk,unk,unk,unk,unk,unk,unk,111,unk,unk,unk,unk,unk,unk,unk,
  42          29, 42, 56,125, 97, 54,100,126,164,166,165,163,161,115,114,113,
  43         150,158,159,128,136,177,178,176,142,152,173,140,unk,unk,unk,unk
  44 };
  45
  46 static const struct {
  47         __s32 x;
  48         __s32 y;
  49 }  hid_hat_to_axis[] = {{ 0, 0}, { 0,-1}, { 1,-1}, { 1, 0}, { 1, 1}, { 0, 1}, {-1, 1}, {-1, 0}, {-1,-1}};
  50
  51 struct usage_priority {
  52         __u32 usage;                    /* the HID usage associated */
  53         bool global;                    /* we assume all usages to be slotted,
  54                                          * unless global
  55                                          */
  56         unsigned int slot_overwrite;    /* for globals: allows to set the usage
  57                                          * before or after the slots
  58                                          */
  59 };
  60
  61 /*
  62  * hid-input will convert this list into priorities:
  63  * the first element will have the highest priority
  64  * (the length of the following array) and the last
  65  * element the lowest (1).
  66  *
  67  * hid-input will then shift the priority by 8 bits to leave some space
  68  * in case drivers want to interleave other fields.
  69  *
  70  * To accommodate slotted devices, the slot priority is
  71  * defined in the next 8 bits (defined by 0xff - slot).
  72  *
  73  * If drivers want to add fields before those, hid-input will
  74  * leave out the first 8 bits of the priority value.
  75  *
  76  * This still leaves us 65535 individual priority values.
  77  */
  78 static const struct usage_priority hidinput_usages_priorities[] = {
  79         { /* Eraser (eraser touching) must always come before tipswitch */
  80           .usage = HID_DG_ERASER,
  81         },
  82         { /* Invert must always come before In Range */
  83           .usage = HID_DG_INVERT,
  84         },
  85         { /* Is the tip of the tool touching? */
  86           .usage = HID_DG_TIPSWITCH,
  87         },
  88         { /* Tip Pressure might emulate tip switch */
  89           .usage = HID_DG_TIPPRESSURE,
  90         },
  91         { /* In Range needs to come after the other tool states */
  92           .usage = HID_DG_INRANGE,
  93         },
  94 };
  95
  96 #define map_abs(c)      hid_map_usage(hidinput, usage, &bit, &max, EV_ABS, (c))
  97 #define map_rel(c)      hid_map_usage(hidinput, usage, &bit, &max, EV_REL, (c))
  98 #define map_key(c)      hid_map_usage(hidinput, usage, &bit, &max, EV_KEY, (c))
  99 #define map_led(c)      hid_map_usage(hidinput, usage, &bit, &max, EV_LED, (c))
 100 #define map_msc(c)      hid_map_usage(hidinput, usage, &bit, &max, EV_MSC, (c))
 101
 102 #define map_abs_clear(c)        hid_map_usage_clear(hidinput, usage, &bit, \
 103                 &max, EV_ABS, (c))
 104 #define map_key_clear(c)        hid_map_usage_clear(hidinput, usage, &bit, \
 105                 &max, EV_KEY, (c))
 106
 107 static bool match_scancode(struct hid_usage *usage,
 108                            unsigned int cur_idx, unsigned int scancode)
 109 {
 110         return (usage->hid & (HID_USAGE_PAGE | HID_USAGE)) == scancode;
 111 }
 112
 113 static bool match_keycode(struct hid_usage *usage,
 114                           unsigned int cur_idx, unsigned int keycode)
 115 {
 116         /*
 117          * We should exclude unmapped usages when doing lookup by keycode.
 118          */
 119         return (usage->type == EV_KEY && usage->code == keycode);
 120 }
 121
 122 static bool match_index(struct hid_usage *usage,
 123                         unsigned int cur_idx, unsigned int idx)
 124 {
 125         return cur_idx == idx;
 126 }
 127
 128 typedef bool (*hid_usage_cmp_t)(struct hid_usage *usage,
 129                                 unsigned int cur_idx, unsigned int val);
 130
 131 static struct hid_usage *hidinput_find_key(struct hid_device *hid,
 132                                            hid_usage_cmp_t match,
 133                                            unsigned int value,
 134                                            unsigned int *usage_idx)
 135 {
 136         unsigned int i, j, k, cur_idx = 0;
 137         struct hid_report *report;
 138         struct hid_usage *usage;
 139
 140         for (k = HID_INPUT_REPORT; k <= HID_OUTPUT_REPORT; k++) {
 141                 list_for_each_entry(report, &hid->report_enum[k].report_list, list) {
 142                         for (i = 0; i < report->maxfield; i++) {
 143                                 for (j = 0; j < report->field[i]->maxusage; j++) {
 144                                         usage = report->field[i]->usage + j;
 145                                         if (usage->type == EV_KEY || usage->type == 0) {
 146                                                 if (match(usage, cur_idx, value)) {
 147                                                         if (usage_idx)
 148                                                                 *usage_idx = cur_idx;
 149                                                         return usage;
 150                                                 }
 151                                                 cur_idx++;
 152                                         }
 153                                 }
 154                         }
 155                 }
 156         }
 157         return NULL;
 158 }
 159
 160 static struct hid_usage *hidinput_locate_usage(struct hid_device *hid,
 161                                         const struct input_keymap_entry *ke,
 162                                         unsigned int *index)
 163 {
 164         struct hid_usage *usage;
 165         unsigned int scancode;
 166
 167         if (ke->flags & INPUT_KEYMAP_BY_INDEX)
 168                 usage = hidinput_find_key(hid, match_index, ke->index, index);
 169         else if (input_scancode_to_scalar(ke, &scancode) == 0)
 170                 usage = hidinput_find_key(hid, match_scancode, scancode, index);
 171         else
 172                 usage = NULL;
 173
 174         return usage;
 175 }
 176
 177 static int hidinput_getkeycode(struct input_dev *dev,
 178                                struct input_keymap_entry *ke)
 179 {
 180         struct hid_device *hid = input_get_drvdata(dev);
 181         struct hid_usage *usage;
 182         unsigned int scancode, index;
 183
 184         usage = hidinput_locate_usage(hid, ke, &index);
 185         if (usage) {
 186                 ke->keycode = usage->type == EV_KEY ?
 187                                 usage->code : KEY_RESERVED;
 188                 ke->index = index;
 189                 scancode = usage->hid & (HID_USAGE_PAGE | HID_USAGE);
 190                 ke->len = sizeof(scancode);
 191                 memcpy(ke->scancode, &scancode, sizeof(scancode));
 192                 return 0;
 193         }
 194
 195         return -EINVAL;
 196 }
 197
 198 static int hidinput_setkeycode(struct input_dev *dev,
 199                                const struct input_keymap_entry *ke,
 200                                unsigned int *old_keycode)
 201 {
 202         struct hid_device *hid = input_get_drvdata(dev);
 203         struct hid_usage *usage;
 204
 205         usage = hidinput_locate_usage(hid, ke, NULL);
 206         if (usage) {
 207                 *old_keycode = usage->type == EV_KEY ?
 208                                 usage->code : KEY_RESERVED;
 209                 usage->type = EV_KEY;
 210                 usage->code = ke->keycode;
 211
 212                 clear_bit(*old_keycode, dev->keybit);
 213                 set_bit(usage->code, dev->keybit);
 214                 dbg_hid("Assigned keycode %d to HID usage code %x\n",
 215                         usage->code, usage->hid);
 216
 217                 /*
 218                  * Set the keybit for the old keycode if the old keycode is used
 219                  * by another key
 220                  */
 221                 if (hidinput_find_key(hid, match_keycode, *old_keycode, NULL))
 222                         set_bit(*old_keycode, dev->keybit);
 223
 224                 return 0;
 225         }
 226
 227         return -EINVAL;
 228 }
 229
 230
 231 /**
 232  * hidinput_calc_abs_res - calculate an absolute axis resolution
 233  * @field: the HID report field to calculate resolution for
 234  * @code: axis code
 235  *
 236  * The formula is:
 237  *                         (logical_maximum - logical_minimum)
 238  * resolution = ----------------------------------------------------------
 239  *              (physical_maximum - physical_minimum) * 10 ^ unit_exponent
 240  *
 241  * as seen in the HID specification v1.11 6.2.2.7 Global Items.
 242  *
 243  * Only exponent 1 length units are processed. Centimeters and inches are
 244  * converted to millimeters. Degrees are converted to radians.
 245  */
 246 __s32 hidinput_calc_abs_res(const struct hid_field *field, __u16 code)
 247 {
 248         __s32 unit_exponent = field->unit_exponent;
 249         __s32 logical_extents = field->logical_maximum -
 250                                         field->logical_minimum;
 251         __s32 physical_extents = field->physical_maximum -
 252                                         field->physical_minimum;
 253         __s32 prev;
 254
 255         /* Check if the extents are sane */
 256         if (logical_extents <= 0 || physical_extents <= 0)
 257                 return 0;
 258
 259         /*
 260          * Verify and convert units.
 261          * See HID specification v1.11 6.2.2.7 Global Items for unit decoding
 262          */
 263         switch (code) {
 264         case ABS_X:
 265         case ABS_Y:
 266         case ABS_Z:
 267         case ABS_MT_POSITION_X:
 268         case ABS_MT_POSITION_Y:
 269         case ABS_MT_TOOL_X:
 270         case ABS_MT_TOOL_Y:
 271         case ABS_MT_TOUCH_MAJOR:
 272         case ABS_MT_TOUCH_MINOR:
 273                 if (field->unit == 0x11) {              /* If centimeters */
 274                         /* Convert to millimeters */
 275                         unit_exponent += 1;
 276                 } else if (field->unit == 0x13) {       /* If inches */
 277                         /* Convert to millimeters */
 278                         prev = physical_extents;
 279                         physical_extents *= 254;
 280                         if (physical_extents < prev)
 281                                 return 0;
 282                         unit_exponent -= 1;
 283                 } else {
 284                         return 0;
 285                 }
 286                 break;
 287
 288         case ABS_RX:
 289         case ABS_RY:
 290         case ABS_RZ:
 291         case ABS_WHEEL:
 292         case ABS_TILT_X:
 293         case ABS_TILT_Y:
 294                 if (field->unit == 0x14) {              /* If degrees */
 295                         /* Convert to radians */
 296                         prev = logical_extents;
 297                         logical_extents *= 573;
 298                         if (logical_extents < prev)
 299                                 return 0;
 300                         unit_exponent += 1;
 301                 } else if (field->unit != 0x12) {       /* If not radians */
 302                         return 0;
 303                 }
 304                 break;
 305
 306         default:
 307                 return 0;
 308         }
 309
 310         /* Apply negative unit exponent */
 311         for (; unit_exponent < 0; unit_exponent++) {
 312                 prev = logical_extents;
 313                 logical_extents *= 10;
 314                 if (logical_extents < prev)
 315                         return 0;
 316         }
 317         /* Apply positive unit exponent */
 318         for (; unit_exponent > 0; unit_exponent--) {
 319                 prev = physical_extents;
 320                 physical_extents *= 10;
 321                 if (physical_extents < prev)
 322                         return 0;
 323         }
 324
 325         /* Calculate resolution */
 326         return DIV_ROUND_CLOSEST(logical_extents, physical_extents);
 327 }
 328 EXPORT_SYMBOL_GPL(hidinput_calc_abs_res);
 329
 330 #ifdef CONFIG_HID_BATTERY_STRENGTH
 331 static enum power_supply_property hidinput_battery_props[] = {
 332         POWER_SUPPLY_PROP_PRESENT,
 333         POWER_SUPPLY_PROP_ONLINE,
 334         POWER_SUPPLY_PROP_CAPACITY,
 335         POWER_SUPPLY_PROP_MODEL_NAME,
 336         POWER_SUPPLY_PROP_STATUS,
 337         POWER_SUPPLY_PROP_SCOPE,
 338 };
 339
 340 #define HID_BATTERY_QUIRK_PERCENT       (1 << 0) /* always reports percent */
 341 #define HID_BATTERY_QUIRK_FEATURE       (1 << 1) /* ask for feature report */
 342 #define HID_BATTERY_QUIRK_IGNORE        (1 << 2) /* completely ignore the battery */
 343 #define HID_BATTERY_QUIRK_AVOID_QUERY   (1 << 3) /* do not query the battery */
 344
 345 static const struct hid_device_id hid_battery_quirks[] = {
 346         { HID_BLUETOOTH_DEVICE(USB_VENDOR_ID_APPLE,
 347                 USB_DEVICE_ID_APPLE_ALU_WIRELESS_2009_ISO),
 348           HID_BATTERY_QUIRK_PERCENT | HID_BATTERY_QUIRK_FEATURE },
 349         { HID_BLUETOOTH_DEVICE(USB_VENDOR_ID_APPLE,
 350                 USB_DEVICE_ID_APPLE_ALU_WIRELESS_2009_ANSI),
 351           HID_BATTERY_QUIRK_PERCENT | HID_BATTERY_QUIRK_FEATURE },
 352         { HID_BLUETOOTH_DEVICE(USB_VENDOR_ID_APPLE,
 353                 USB_DEVICE_ID_APPLE_ALU_WIRELESS_2011_ANSI),
 354           HID_BATTERY_QUIRK_PERCENT | HID_BATTERY_QUIRK_FEATURE },
 355         { HID_BLUETOOTH_DEVICE(USB_VENDOR_ID_APPLE,
 356                                USB_DEVICE_ID_APPLE_ALU_WIRELESS_2011_ISO),
 357           HID_BATTERY_QUIRK_PERCENT | HID_BATTERY_QUIRK_FEATURE },
 358         { HID_BLUETOOTH_DEVICE(USB_VENDOR_ID_APPLE,
 359                 USB_DEVICE_ID_APPLE_ALU_WIRELESS_ANSI),
 360           HID_BATTERY_QUIRK_PERCENT | HID_BATTERY_QUIRK_FEATURE },
 361         { HID_BLUETOOTH_DEVICE(USB_VENDOR_ID_ELECOM,
 362                 USB_DEVICE_ID_ELECOM_BM084),
 363           HID_BATTERY_QUIRK_IGNORE },
 364         { HID_USB_DEVICE(USB_VENDOR_ID_SYMBOL,
 365                 USB_DEVICE_ID_SYMBOL_SCANNER_3),
 366           HID_BATTERY_QUIRK_IGNORE },
 367         { HID_BLUETOOTH_DEVICE(USB_VENDOR_ID_ASUSTEK,
 368                 USB_DEVICE_ID_ASUSTEK_T100CHI_KEYBOARD),
 369           HID_BATTERY_QUIRK_IGNORE },
 370         { HID_BLUETOOTH_DEVICE(USB_VENDOR_ID_LOGITECH,
 371                 USB_DEVICE_ID_LOGITECH_DINOVO_EDGE_KBD),
 372           HID_BATTERY_QUIRK_IGNORE },
 373         { HID_USB_DEVICE(USB_VENDOR_ID_ELAN, USB_DEVICE_ID_ASUS_UX550_TOUCHSCREEN),
 374           HID_BATTERY_QUIRK_IGNORE },
 375         { HID_USB_DEVICE(USB_VENDOR_ID_ELAN, USB_DEVICE_ID_ASUS_UX550VE_TOUCHSCREEN),
 376           HID_BATTERY_QUIRK_IGNORE },
 377         { HID_USB_DEVICE(USB_VENDOR_ID_UGEE, USB_DEVICE_ID_UGEE_XPPEN_TABLET_DECO_L),
 378           HID_BATTERY_QUIRK_AVOID_QUERY },
 379         { HID_I2C_DEVICE(USB_VENDOR_ID_ELAN, I2C_DEVICE_ID_HP_ENVY_X360_15),
 380           HID_BATTERY_QUIRK_IGNORE },
 381         { HID_I2C_DEVICE(USB_VENDOR_ID_ELAN, I2C_DEVICE_ID_HP_ENVY_X360_15T_DR100),
 382           HID_BATTERY_QUIRK_IGNORE },
 383         { HID_I2C_DEVICE(USB_VENDOR_ID_ELAN, I2C_DEVICE_ID_HP_ENVY_X360_EU0009NV),
 384           HID_BATTERY_QUIRK_IGNORE },
 385         { HID_I2C_DEVICE(USB_VENDOR_ID_ELAN, I2C_DEVICE_ID_HP_SPECTRE_X360_15),
 386           HID_BATTERY_QUIRK_IGNORE },
 387         { HID_I2C_DEVICE(USB_VENDOR_ID_ELAN, I2C_DEVICE_ID_SURFACE_GO_TOUCHSCREEN),
 388           HID_BATTERY_QUIRK_IGNORE },
 389         { HID_I2C_DEVICE(USB_VENDOR_ID_ELAN, I2C_DEVICE_ID_SURFACE_GO2_TOUCHSCREEN),
 390           HID_BATTERY_QUIRK_IGNORE },
 391         { HID_I2C_DEVICE(USB_VENDOR_ID_ELAN, I2C_DEVICE_ID_LENOVO_YOGA_C630_TOUCHSCREEN),
 392           HID_BATTERY_QUIRK_IGNORE },
 393         {}
 394 };
 395
 396 static unsigned find_battery_quirk(struct hid_device *hdev)
 397 {
 398         unsigned quirks = 0;
 399         const struct hid_device_id *match;
 400
 401         match = hid_match_id(hdev, hid_battery_quirks);
 402         if (match != NULL)
 403                 quirks = match->driver_data;
 404
 405         return quirks;
 406 }
 407
 408 static int hidinput_scale_battery_capacity(struct hid_device *dev,
 409                                            int value)
 410 {
 411         if (dev->battery_min < dev->battery_max &&
 412             value >= dev->battery_min && value <= dev->battery_max)
 413                 value = ((value - dev->battery_min) * 100) /
 414                         (dev->battery_max - dev->battery_min);
 415
 416         return value;
 417 }
 418
 419 static int hidinput_query_battery_capacity(struct hid_device *dev)
 420 {
 421         u8 *buf;
 422         int ret;
 423
 424         buf = kmalloc(4, GFP_KERNEL);
 425         if (!buf)
 426                 return -ENOMEM;
 427
 428         ret = hid_hw_raw_request(dev, dev->battery_report_id, buf, 4,
 429                                  dev->battery_report_type, HID_REQ_GET_REPORT);
 430         if (ret < 2) {
 431                 kfree(buf);
 432                 return -ENODATA;
 433         }
 434
 435         ret = hidinput_scale_battery_capacity(dev, buf[1]);
 436         kfree(buf);
 437         return ret;
 438 }
 439
 440 static int hidinput_get_battery_property(struct power_supply *psy,
 441                                          enum power_supply_property prop,
 442                                          union power_supply_propval *val)
 443 {
 444         struct hid_device *dev = power_supply_get_drvdata(psy);
 445         int value;
 446         int ret = 0;
 447
 448         switch (prop) {
 449         case POWER_SUPPLY_PROP_PRESENT:
 450         case POWER_SUPPLY_PROP_ONLINE:
 451                 val->intval = 1;
 452                 break;
 453
 454         case POWER_SUPPLY_PROP_CAPACITY:
 455                 if (dev->battery_status != HID_BATTERY_REPORTED &&
 456                     !dev->battery_avoid_query) {
 457                         value = hidinput_query_battery_capacity(dev);
 458                         if (value < 0)
 459                                 return value;
 460                 } else  {
 461                         value = dev->battery_capacity;
 462                 }
 463
 464                 val->intval = value;
 465                 break;
 466
 467         case POWER_SUPPLY_PROP_MODEL_NAME:
 468                 val->strval = dev->name;
 469                 break;
 470
 471         case POWER_SUPPLY_PROP_STATUS:
 472                 if (dev->battery_status != HID_BATTERY_REPORTED &&
 473                     !dev->battery_avoid_query) {
 474                         value = hidinput_query_battery_capacity(dev);
 475                         if (value < 0)
 476                                 return value;
 477
 478                         dev->battery_capacity = value;
 479                         dev->battery_status = HID_BATTERY_QUERIED;
 480                 }
 481
 482                 if (dev->battery_status == HID_BATTERY_UNKNOWN)
 483                         val->intval = POWER_SUPPLY_STATUS_UNKNOWN;
 484                 else
 485                         val->intval = POWER_SUPPLY_STATUS_DISCHARGING;
 486                 break;
 487
 488         case POWER_SUPPLY_PROP_SCOPE:
 489                 val->intval = POWER_SUPPLY_SCOPE_DEVICE;
 490                 break;
 491
 492         default:
 493                 ret = -EINVAL;
 494                 break;
 495         }
 496
 497         return ret;
 498 }
 499
 500 static int hidinput_setup_battery(struct hid_device *dev, unsigned report_type,
 501                                   struct hid_field *field, bool is_percentage)
 502 {
 503         struct power_supply_desc *psy_desc;
 504         struct power_supply_config psy_cfg = { .drv_data = dev, };
 505         unsigned quirks;
 506         s32 min, max;
 507         int error;
 508
 509         if (dev->battery)
 510                 return 0;       /* already initialized? */
 511
 512         quirks = find_battery_quirk(dev);
 513
 514         hid_dbg(dev, "device %x:%x:%x %d quirks %d\n",
 515                 dev->bus, dev->vendor, dev->product, dev->version, quirks);
 516
 517         if (quirks & HID_BATTERY_QUIRK_IGNORE)
 518                 return 0;
 519
 520         psy_desc = kzalloc(sizeof(*psy_desc), GFP_KERNEL);
 521         if (!psy_desc)
 522                 return -ENOMEM;
 523
 524         psy_desc->name = kasprintf(GFP_KERNEL, "hid-%s-battery",
 525                                    strlen(dev->uniq) ?
 526                                         dev->uniq : dev_name(&dev->dev));
 527         if (!psy_desc->name) {
 528                 error = -ENOMEM;
 529                 goto err_free_mem;
 530         }
 531
 532         psy_desc->type = POWER_SUPPLY_TYPE_BATTERY;
 533         psy_desc->properties = hidinput_battery_props;
 534         psy_desc->num_properties = ARRAY_SIZE(hidinput_battery_props);
 535         psy_desc->use_for_apm = 0;
 536         psy_desc->get_property = hidinput_get_battery_property;
 537
 538         min = field->logical_minimum;
 539         max = field->logical_maximum;
 540
 541         if (is_percentage || (quirks & HID_BATTERY_QUIRK_PERCENT)) {
 542                 min = 0;
 543                 max = 100;
 544         }
 545
 546         if (quirks & HID_BATTERY_QUIRK_FEATURE)
 547                 report_type = HID_FEATURE_REPORT;
 548
 549         dev->battery_min = min;
 550         dev->battery_max = max;
 551         dev->battery_report_type = report_type;
 552         dev->battery_report_id = field->report->id;
 553
 554         /*
 555          * Stylus is normally not connected to the device and thus we
 556          * can't query the device and get meaningful battery strength.
 557          * We have to wait for the device to report it on its own.
 558          */
 559         dev->battery_avoid_query = report_type == HID_INPUT_REPORT &&
 560                                    field->physical == HID_DG_STYLUS;
 561
 562         if (quirks & HID_BATTERY_QUIRK_AVOID_QUERY)
 563                 dev->battery_avoid_query = true;
 564
 565         dev->battery = power_supply_register(&dev->dev, psy_desc, &psy_cfg);
 566         if (IS_ERR(dev->battery)) {
 567                 error = PTR_ERR(dev->battery);
 568                 hid_warn(dev, "can't register power supply: %d\n", error);
 569                 goto err_free_name;
 570         }
 571
 572         power_supply_powers(dev->battery, &dev->dev);
 573         return 0;
 574
 575 err_free_name:
 576         kfree(psy_desc->name);
 577 err_free_mem:
 578         kfree(psy_desc);
 579         dev->battery = NULL;
 580         return error;
 581 }
 582
 583 static void hidinput_cleanup_battery(struct hid_device *dev)
 584 {
 585         const struct power_supply_desc *psy_desc;
 586
 587         if (!dev->battery)
 588                 return;
 589
 590         psy_desc = dev->battery->desc;
 591         power_supply_unregister(dev->battery);
 592         kfree(psy_desc->name);
 593         kfree(psy_desc);
 594         dev->battery = NULL;
 595 }
 596
 597 static void hidinput_update_battery(struct hid_device *dev, int value)
 598 {
 599         int capacity;
 600
 601         if (!dev->battery)
 602                 return;
 603
 604         if (value == 0 || value < dev->battery_min || value > dev->battery_max)
 605                 return;
 606
 607         capacity = hidinput_scale_battery_capacity(dev, value);
 608
 609         if (dev->battery_status != HID_BATTERY_REPORTED ||
 610             capacity != dev->battery_capacity ||
 611             ktime_after(ktime_get_coarse(), dev->battery_ratelimit_time)) {
 612                 dev->battery_capacity = capacity;
 613                 dev->battery_status = HID_BATTERY_REPORTED;
 614                 dev->battery_ratelimit_time =
 615                         ktime_add_ms(ktime_get_coarse(), 30 * 1000);
 616                 power_supply_changed(dev->battery);
 617         }
 618 }
 619 #else  /* !CONFIG_HID_BATTERY_STRENGTH */
 620 static int hidinput_setup_battery(struct hid_device *dev, unsigned report_type,
 621                                   struct hid_field *field, bool is_percentage)
 622 {
 623         return 0;
 624 }
 625
 626 static void hidinput_cleanup_battery(struct hid_device *dev)
 627 {
 628 }
 629
 630 static void hidinput_update_battery(struct hid_device *dev, int value)
 631 {
 632 }
 633 #endif  /* CONFIG_HID_BATTERY_STRENGTH */
 634
 635 static bool hidinput_field_in_collection(struct hid_device *device, struct hid_field *field,
 636                                          unsigned int type, unsigned int usage)
 637 {
 638         struct hid_collection *collection;
 639
 640         collection = &device->collection[field->usage->collection_index];
 641
 642         return collection->type == type && collection->usage == usage;
 643 }
 644
 645 static void hidinput_configure_usage(struct hid_input *hidinput, struct hid_field *field,
 646                                      struct hid_usage *usage, unsigned int usage_index)
 647 {
 648         struct input_dev *input = hidinput->input;
 649         struct hid_device *device = input_get_drvdata(input);
 650         const struct usage_priority *usage_priority = NULL;
 651         int max = 0, code;
 652         unsigned int i = 0;
 653         unsigned long *bit = NULL;
 654
 655         field->hidinput = hidinput;
 656
 657         if (field->flags & HID_MAIN_ITEM_CONSTANT)
 658                 goto ignore;
 659
 660         /* Ignore if report count is out of bounds. */
 661         if (field->report_count < 1)
 662                 goto ignore;
 663
 664         /* only LED usages are supported in output fields */
 665         if (field->report_type == HID_OUTPUT_REPORT &&
 666                         (usage->hid & HID_USAGE_PAGE) != HID_UP_LED) {
 667                 goto ignore;
 668         }
 669
 670         /* assign a priority based on the static list declared here */
 671         for (i = 0; i < ARRAY_SIZE(hidinput_usages_priorities); i++) {
 672                 if (usage->hid == hidinput_usages_priorities[i].usage) {
 673                         usage_priority = &hidinput_usages_priorities[i];
 674
 675                         field->usages_priorities[usage_index] =
 676                                 (ARRAY_SIZE(hidinput_usages_priorities) - i) << 8;
 677                         break;
 678                 }
 679         }
 680
 681         /*
 682          * For slotted devices, we need to also add the slot index
 683          * in the priority.
 684          */
 685         if (usage_priority && usage_priority->global)
 686                 field->usages_priorities[usage_index] |=
 687                         usage_priority->slot_overwrite;
 688         else
 689                 field->usages_priorities[usage_index] |=
 690                         (0xff - field->slot_idx) << 16;
 691
 692         if (device->driver->input_mapping) {
 693                 int ret = device->driver->input_mapping(device, hidinput, field,
 694                                 usage, &bit, &max);
 695                 if (ret > 0)
 696                         goto mapped;
 697                 if (ret < 0)
 698                         goto ignore;
 699         }
 700
 701         switch (usage->hid & HID_USAGE_PAGE) {
 702         case HID_UP_UNDEFINED:
 703                 goto ignore;
 704
 705         case HID_UP_KEYBOARD:
 706                 set_bit(EV_REP, input->evbit);
 707
 708                 if ((usage->hid & HID_USAGE) < 256) {
 709                         if (!hid_keyboard[usage->hid & HID_USAGE]) goto ignore;
 710                         map_key_clear(hid_keyboard[usage->hid & HID_USAGE]);
 711                 } else
 712                         map_key(KEY_UNKNOWN);
 713
 714                 break;
 715
 716         case HID_UP_BUTTON:
 717                 code = ((usage->hid - 1) & HID_USAGE);
 718
 719                 switch (field->application) {
 720                 case HID_GD_MOUSE:
 721                 case HID_GD_POINTER:  code += BTN_MOUSE; break;
 722                 case HID_GD_JOYSTICK:
 723                                 if (code <= 0xf)
 724                                         code += BTN_JOYSTICK;
 725                                 else
 726                                         code += BTN_TRIGGER_HAPPY - 0x10;
 727                                 break;
 728                 case HID_GD_GAMEPAD:
 729                                 if (code <= 0xf)
 730                                         code += BTN_GAMEPAD;
 731                                 else
 732                                         code += BTN_TRIGGER_HAPPY - 0x10;
 733                                 break;
 734                 case HID_CP_CONSUMER_CONTROL:
 735                                 if (hidinput_field_in_collection(device, field,
 736                                                                  HID_COLLECTION_NAMED_ARRAY,
 737                                                                  HID_CP_PROGRAMMABLEBUTTONS)) {
 738                                         if (code <= 0x1d)
 739                                                 code += KEY_MACRO1;
 740                                         else
 741                                                 code += BTN_TRIGGER_HAPPY - 0x1e;
 742                                         break;
 743                                 }
 744                                 fallthrough;
 745                 default:
 746                         switch (field->physical) {
 747                         case HID_GD_MOUSE:
 748                         case HID_GD_POINTER:  code += BTN_MOUSE; break;
 749                         case HID_GD_JOYSTICK: code += BTN_JOYSTICK; break;
 750                         case HID_GD_GAMEPAD:  code += BTN_GAMEPAD; break;
 751                         default:              code += BTN_MISC;
 752                         }
 753                 }
 754
 755                 map_key(code);
 756                 break;
 757
 758         case HID_UP_SIMULATION:
 759                 switch (usage->hid & 0xffff) {
 760                 case 0xba: map_abs(ABS_RUDDER);   break;
 761                 case 0xbb: map_abs(ABS_THROTTLE); break;
 762                 case 0xc4: map_abs(ABS_GAS);      break;
 763                 case 0xc5: map_abs(ABS_BRAKE);    break;
 764                 case 0xc8: map_abs(ABS_WHEEL);    break;
 765                 default:   goto ignore;
 766                 }
 767                 break;
 768
 769         case HID_UP_GENDESK:
 770                 if ((usage->hid & 0xf0) == 0x80) {      /* SystemControl */
 771                         switch (usage->hid & 0xf) {
 772                         case 0x1: map_key_clear(KEY_POWER);  break;
 773                         case 0x2: map_key_clear(KEY_SLEEP);  break;
 774                         case 0x3: map_key_clear(KEY_WAKEUP); break;
 775                         case 0x4: map_key_clear(KEY_CONTEXT_MENU); break;
 776                         case 0x5: map_key_clear(KEY_MENU); break;
 777                         case 0x6: map_key_clear(KEY_PROG1); break;
 778                         case 0x7: map_key_clear(KEY_HELP); break;
 779                         case 0x8: map_key_clear(KEY_EXIT); break;
 780                         case 0x9: map_key_clear(KEY_SELECT); break;
 781                         case 0xa: map_key_clear(KEY_RIGHT); break;
 782                         case 0xb: map_key_clear(KEY_LEFT); break;
 783                         case 0xc: map_key_clear(KEY_UP); break;
 784                         case 0xd: map_key_clear(KEY_DOWN); break;
 785                         case 0xe: map_key_clear(KEY_POWER2); break;
 786                         case 0xf: map_key_clear(KEY_RESTART); break;
 787                         default: goto unknown;
 788                         }
 789                         break;
 790                 }
 791
 792                 if ((usage->hid & 0xf0) == 0xb0) {      /* SC - Display */
 793                         switch (usage->hid & 0xf) {
 794                         case 0x05: map_key_clear(KEY_SWITCHVIDEOMODE); break;
 795                         default: goto ignore;
 796                         }
 797                         break;
 798                 }
 799
 800                 /*
 801                  * Some lazy vendors declare 255 usages for System Control,
 802                  * leading to the creation of ABS_X|Y axis and too many others.
 803                  * It wouldn't be a problem if joydev doesn't consider the
 804                  * device as a joystick then.
 805                  */
 806                 if (field->application == HID_GD_SYSTEM_CONTROL)
 807                         goto ignore;
 808
 809                 if ((usage->hid & 0xf0) == 0x90) {      /* D-pad */
 810                         switch (usage->hid) {
 811                         case HID_GD_UP:    usage->hat_dir = 1; break;
 812                         case HID_GD_DOWN:  usage->hat_dir = 5; break;
 813                         case HID_GD_RIGHT: usage->hat_dir = 3; break;
 814                         case HID_GD_LEFT:  usage->hat_dir = 7; break;
 815                         default: goto unknown;
 816                         }
 817                         if (field->dpad) {
 818                                 map_abs(field->dpad);
 819                                 goto ignore;
 820                         }
 821                         map_abs(ABS_HAT0X);
 822                         break;
 823                 }
 824
 825                 switch (usage->hid) {
 826                 /* These usage IDs map directly to the usage codes. */
 827                 case HID_GD_X: case HID_GD_Y: case HID_GD_Z:
 828                 case HID_GD_RX: case HID_GD_RY: case HID_GD_RZ:
 829                         if (field->flags & HID_MAIN_ITEM_RELATIVE)
 830                                 map_rel(usage->hid & 0xf);
 831                         else
 832                                 map_abs_clear(usage->hid & 0xf);
 833                         break;
 834
 835                 case HID_GD_WHEEL:
 836                         if (field->flags & HID_MAIN_ITEM_RELATIVE) {
 837                                 set_bit(REL_WHEEL, input->relbit);
 838                                 map_rel(REL_WHEEL_HI_RES);
 839                         } else {
 840                                 map_abs(usage->hid & 0xf);
 841                         }
 842                         break;
 843                 case HID_GD_SLIDER: case HID_GD_DIAL:
 844                         if (field->flags & HID_MAIN_ITEM_RELATIVE)
 845                                 map_rel(usage->hid & 0xf);
 846                         else
 847                                 map_abs(usage->hid & 0xf);
 848                         break;
 849
 850                 case HID_GD_HATSWITCH:
 851                         usage->hat_min = field->logical_minimum;
 852                         usage->hat_max = field->logical_maximum;
 853                         map_abs(ABS_HAT0X);
 854                         break;
 855
 856                 case HID_GD_START:      map_key_clear(BTN_START);       break;
 857                 case HID_GD_SELECT:     map_key_clear(BTN_SELECT);      break;
 858
 859                 case HID_GD_RFKILL_BTN:
 860                         /* MS wireless radio ctl extension, also check CA */
 861                         if (field->application == HID_GD_WIRELESS_RADIO_CTLS) {
 862                                 map_key_clear(KEY_RFKILL);
 863                                 /* We need to simulate the btn release */
 864                                 field->flags |= HID_MAIN_ITEM_RELATIVE;
 865                                 break;
 866                         }
 867                         goto unknown;
 868
 869                 default: goto unknown;
 870                 }
 871
 872                 break;
 873
 874         case HID_UP_LED:
 875                 switch (usage->hid & 0xffff) {                /* HID-Value:                   */
 876                 case 0x01:  map_led (LED_NUML);     break;    /*   "Num Lock"                 */
 877                 case 0x02:  map_led (LED_CAPSL);    break;    /*   "Caps Lock"                */
 878                 case 0x03:  map_led (LED_SCROLLL);  break;    /*   "Scroll Lock"              */
 879                 case 0x04:  map_led (LED_COMPOSE);  break;    /*   "Compose"                  */
 880                 case 0x05:  map_led (LED_KANA);     break;    /*   "Kana"                     */
 881                 case 0x27:  map_led (LED_SLEEP);    break;    /*   "Stand-By"                 */
 882                 case 0x4c:  map_led (LED_SUSPEND);  break;    /*   "System Suspend"           */
 883                 case 0x09:  map_led (LED_MUTE);     break;    /*   "Mute"                     */
 884                 case 0x4b:  map_led (LED_MISC);     break;    /*   "Generic Indicator"        */
 885                 case 0x19:  map_led (LED_MAIL);     break;    /*   "Message Waiting"          */
 886                 case 0x4d:  map_led (LED_CHARGING); break;    /*   "External Power Connected" */
 887
 888                 default: goto ignore;
 889                 }
 890                 break;
 891
 892         case HID_UP_DIGITIZER:
 893                 if ((field->application & 0xff) == 0x01) /* Digitizer */
 894                         __set_bit(INPUT_PROP_POINTER, input->propbit);
 895                 else if ((field->application & 0xff) == 0x02) /* Pen */
 896                         __set_bit(INPUT_PROP_DIRECT, input->propbit);
 897
 898                 switch (usage->hid & 0xff) {
 899                 case 0x00: /* Undefined */
 900                         goto ignore;
 901
 902                 case 0x30: /* TipPressure */
 903                         if (!test_bit(BTN_TOUCH, input->keybit)) {
 904                                 device->quirks |= HID_QUIRK_NOTOUCH;
 905                                 set_bit(EV_KEY, input->evbit);
 906                                 set_bit(BTN_TOUCH, input->keybit);
 907                         }
 908                         map_abs_clear(ABS_PRESSURE);
 909                         break;
 910
 911                 case 0x32: /* InRange */
 912                         switch (field->physical) {
 913                         case HID_DG_PUCK:
 914                                 map_key(BTN_TOOL_MOUSE);
 915                                 break;
 916                         case HID_DG_FINGER:
 917                                 map_key(BTN_TOOL_FINGER);
 918                                 break;
 919                         default:
 920                                 /*
 921                                  * If the physical is not given,
 922                                  * rely on the application.
 923                                  */
 924                                 if (!field->physical) {
 925                                         switch (field->application) {
 926                                         case HID_DG_TOUCHSCREEN:
 927                                         case HID_DG_TOUCHPAD:
 928                                                 map_key_clear(BTN_TOOL_FINGER);
 929                                                 break;
 930                                         default:
 931                                                 map_key_clear(BTN_TOOL_PEN);
 932                                         }
 933                                 } else {
 934                                         map_key(BTN_TOOL_PEN);
 935                                 }
 936                                 break;
 937                         }
 938                         break;
 939
 940                 case 0x3b: /* Battery Strength */
 941                         hidinput_setup_battery(device, HID_INPUT_REPORT, field, false);
 942                         usage->type = EV_PWR;
 943                         return;
 944
 945                 case 0x3c: /* Invert */
 946                         map_key_clear(BTN_TOOL_RUBBER);
 947                         break;
 948
 949                 case 0x3d: /* X Tilt */
 950                         map_abs_clear(ABS_TILT_X);
 951                         break;
 952
 953                 case 0x3e: /* Y Tilt */
 954                         map_abs_clear(ABS_TILT_Y);
 955                         break;
 956
 957                 case 0x33: /* Touch */
 958                 case 0x42: /* TipSwitch */
 959                 case 0x43: /* TipSwitch2 */
 960                         device->quirks &= ~HID_QUIRK_NOTOUCH;
 961                         map_key_clear(BTN_TOUCH);
 962                         break;
 963
 964                 case 0x44: /* BarrelSwitch */
 965                         map_key_clear(BTN_STYLUS);
 966                         break;
 967
 968                 case 0x45: /* ERASER */
 969                         /*
 970                          * This event is reported when eraser tip touches the surface.
 971                          * Actual eraser (BTN_TOOL_RUBBER) is set by Invert usage when
 972                          * tool gets in proximity.
 973                          */
 974                         map_key_clear(BTN_TOUCH);
 975                         break;
 976
 977                 case 0x46: /* TabletPick */
 978                 case 0x5a: /* SecondaryBarrelSwitch */
 979                         map_key_clear(BTN_STYLUS2);
 980                         break;
 981
 982                 case 0x5b: /* TransducerSerialNumber */
 983                 case 0x6e: /* TransducerSerialNumber2 */
 984                         map_msc(MSC_SERIAL);
 985                         break;
 986
 987                 default:  goto unknown;
 988                 }
 989                 break;
 990
 991         case HID_UP_TELEPHONY:
 992                 switch (usage->hid & HID_USAGE) {
 993                 case 0x2f: map_key_clear(KEY_MICMUTE);          break;
 994                 case 0xb0: map_key_clear(KEY_NUMERIC_0);        break;
 995                 case 0xb1: map_key_clear(KEY_NUMERIC_1);        break;
 996                 case 0xb2: map_key_clear(KEY_NUMERIC_2);        break;
 997                 case 0xb3: map_key_clear(KEY_NUMERIC_3);        break;
 998                 case 0xb4: map_key_clear(KEY_NUMERIC_4);        break;
 999                 case 0xb5: map_key_clear(KEY_NUMERIC_5);        break;
1000                 case 0xb6: map_key_clear(KEY_NUMERIC_6);        break;
1001                 case 0xb7: map_key_clear(KEY_NUMERIC_7);        break;
1002                 case 0xb8: map_key_clear(KEY_NUMERIC_8);        break;
1003                 case 0xb9: map_key_clear(KEY_NUMERIC_9);        break;
1004                 case 0xba: map_key_clear(KEY_NUMERIC_STAR);     break;
1005                 case 0xbb: map_key_clear(KEY_NUMERIC_POUND);    break;
1006                 case 0xbc: map_key_clear(KEY_NUMERIC_A);        break;
1007                 case 0xbd: map_key_clear(KEY_NUMERIC_B);        break;
1008                 case 0xbe: map_key_clear(KEY_NUMERIC_C);        break;
1009                 case 0xbf: map_key_clear(KEY_NUMERIC_D);        break;
1010                 default: goto ignore;
1011                 }
1012                 break;
1013
1014         case HID_UP_CONSUMER:   /* USB HUT v1.12, pages 75-84 */
1015                 switch (usage->hid & HID_USAGE) {
1016                 case 0x000: goto ignore;
1017                 case 0x030: map_key_clear(KEY_POWER);           break;
1018                 case 0x031: map_key_clear(KEY_RESTART);         break;
1019                 case 0x032: map_key_clear(KEY_SLEEP);           break;
1020                 case 0x034: map_key_clear(KEY_SLEEP);           break;
1021                 case 0x035: map_key_clear(KEY_KBDILLUMTOGGLE);  break;
1022                 case 0x036: map_key_clear(BTN_MISC);            break;
1023
1024                 case 0x040: map_key_clear(KEY_MENU);            break; /* Menu */
1025                 case 0x041: map_key_clear(KEY_SELECT);          break; /* Menu Pick */
1026                 case 0x042: map_key_clear(KEY_UP);              break; /* Menu Up */
1027                 case 0x043: map_key_clear(KEY_DOWN);            break; /* Menu Down */
1028                 case 0x044: map_key_clear(KEY_LEFT);            break; /* Menu Left */
1029                 case 0x045: map_key_clear(KEY_RIGHT);           break; /* Menu Right */
1030                 case 0x046: map_key_clear(KEY_ESC);             break; /* Menu Escape */
1031                 case 0x047: map_key_clear(KEY_KPPLUS);          break; /* Menu Value Increase */
1032                 case 0x048: map_key_clear(KEY_KPMINUS);         break; /* Menu Value Decrease */
1033
1034                 case 0x060: map_key_clear(KEY_INFO);            break; /* Data On Screen */
1035                 case 0x061: map_key_clear(KEY_SUBTITLE);        break; /* Closed Caption */
1036                 case 0x063: map_key_clear(KEY_VCR);             break; /* VCR/TV */
1037                 case 0x065: map_key_clear(KEY_CAMERA);          break; /* Snapshot */
1038                 case 0x069: map_key_clear(KEY_RED);             break;
1039                 case 0x06a: map_key_clear(KEY_GREEN);           break;
1040                 case 0x06b: map_key_clear(KEY_BLUE);            break;
1041                 case 0x06c: map_key_clear(KEY_YELLOW);          break;
1042                 case 0x06d: map_key_clear(KEY_ASPECT_RATIO);    break;
1043
1044                 case 0x06f: map_key_clear(KEY_BRIGHTNESSUP);            break;
1045                 case 0x070: map_key_clear(KEY_BRIGHTNESSDOWN);          break;
1046                 case 0x072: map_key_clear(KEY_BRIGHTNESS_TOGGLE);       break;
1047                 case 0x073: map_key_clear(KEY_BRIGHTNESS_MIN);          break;
1048                 case 0x074: map_key_clear(KEY_BRIGHTNESS_MAX);          break;
1049                 case 0x075: map_key_clear(KEY_BRIGHTNESS_AUTO);         break;
1050
1051                 case 0x079: map_key_clear(KEY_KBDILLUMUP);      break;
1052                 case 0x07a: map_key_clear(KEY_KBDILLUMDOWN);    break;
1053                 case 0x07c: map_key_clear(KEY_KBDILLUMTOGGLE);  break;
1054
1055                 case 0x082: map_key_clear(KEY_VIDEO_NEXT);      break;
1056                 case 0x083: map_key_clear(KEY_LAST);            break;
1057                 case 0x084: map_key_clear(KEY_ENTER);           break;
1058                 case 0x088: map_key_clear(KEY_PC);              break;
1059                 case 0x089: map_key_clear(KEY_TV);              break;
1060                 case 0x08a: map_key_clear(KEY_WWW);             break;
1061                 case 0x08b: map_key_clear(KEY_DVD);             break;
1062                 case 0x08c: map_key_clear(KEY_PHONE);           break;
1063                 case 0x08d: map_key_clear(KEY_PROGRAM);         break;
1064                 case 0x08e: map_key_clear(KEY_VIDEOPHONE);      break;
1065                 case 0x08f: map_key_clear(KEY_GAMES);           break;
1066                 case 0x090: map_key_clear(KEY_MEMO);            break;
1067                 case 0x091: map_key_clear(KEY_CD);              break;
1068                 case 0x092: map_key_clear(KEY_VCR);             break;
1069                 case 0x093: map_key_clear(KEY_TUNER);           break;
1070                 case 0x094: map_key_clear(KEY_EXIT);            break;
1071                 case 0x095: map_key_clear(KEY_HELP);            break;
1072                 case 0x096: map_key_clear(KEY_TAPE);            break;
1073                 case 0x097: map_key_clear(KEY_TV2);             break;
1074                 case 0x098: map_key_clear(KEY_SAT);             break;
1075                 case 0x09a: map_key_clear(KEY_PVR);             break;
1076
1077                 case 0x09c: map_key_clear(KEY_CHANNELUP);       break;
1078                 case 0x09d: map_key_clear(KEY_CHANNELDOWN);     break;
1079                 case 0x0a0: map_key_clear(KEY_VCR2);            break;
1080
1081                 case 0x0b0: map_key_clear(KEY_PLAY);            break;
1082                 case 0x0b1: map_key_clear(KEY_PAUSE);           break;
1083                 case 0x0b2: map_key_clear(KEY_RECORD);          break;
1084                 case 0x0b3: map_key_clear(KEY_FASTFORWARD);     break;
1085                 case 0x0b4: map_key_clear(KEY_REWIND);          break;
1086                 case 0x0b5: map_key_clear(KEY_NEXTSONG);        break;
1087                 case 0x0b6: map_key_clear(KEY_PREVIOUSSONG);    break;
1088                 case 0x0b7: map_key_clear(KEY_STOPCD);          break;
1089                 case 0x0b8: map_key_clear(KEY_EJECTCD);         break;
1090                 case 0x0bc: map_key_clear(KEY_MEDIA_REPEAT);    break;
1091                 case 0x0b9: map_key_clear(KEY_SHUFFLE);         break;
1092                 case 0x0bf: map_key_clear(KEY_SLOW);            break;
1093
1094                 case 0x0cd: map_key_clear(KEY_PLAYPAUSE);       break;
1095                 case 0x0cf: map_key_clear(KEY_VOICECOMMAND);    break;
1096
1097                 case 0x0d5: map_key_clear(KEY_CAMERA_ACCESS_ENABLE);            break;
1098                 case 0x0d6: map_key_clear(KEY_CAMERA_ACCESS_DISABLE);           break;
1099                 case 0x0d7: map_key_clear(KEY_CAMERA_ACCESS_TOGGLE);            break;
1100                 case 0x0d8: map_key_clear(KEY_DICTATE);         break;
1101                 case 0x0d9: map_key_clear(KEY_EMOJI_PICKER);    break;
1102
1103                 case 0x0e0: map_abs_clear(ABS_VOLUME);          break;
1104                 case 0x0e2: map_key_clear(KEY_MUTE);            break;
1105                 case 0x0e5: map_key_clear(KEY_BASSBOOST);       break;
1106                 case 0x0e9: map_key_clear(KEY_VOLUMEUP);        break;
1107                 case 0x0ea: map_key_clear(KEY_VOLUMEDOWN);      break;
1108                 case 0x0f5: map_key_clear(KEY_SLOW);            break;
1109
1110                 case 0x181: map_key_clear(KEY_BUTTONCONFIG);    break;
1111                 case 0x182: map_key_clear(KEY_BOOKMARKS);       break;
1112                 case 0x183: map_key_clear(KEY_CONFIG);          break;
1113                 case 0x184: map_key_clear(KEY_WORDPROCESSOR);   break;
1114                 case 0x185: map_key_clear(KEY_EDITOR);          break;
1115                 case 0x186: map_key_clear(KEY_SPREADSHEET);     break;
1116                 case 0x187: map_key_clear(KEY_GRAPHICSEDITOR);  break;
1117                 case 0x188: map_key_clear(KEY_PRESENTATION);    break;
1118                 case 0x189: map_key_clear(KEY_DATABASE);        break;
1119                 case 0x18a: map_key_clear(KEY_MAIL);            break;
1120                 case 0x18b: map_key_clear(KEY_NEWS);            break;
1121                 case 0x18c: map_key_clear(KEY_VOICEMAIL);       break;
1122                 case 0x18d: map_key_clear(KEY_ADDRESSBOOK);     break;
1123                 case 0x18e: map_key_clear(KEY_CALENDAR);        break;
1124                 case 0x18f: map_key_clear(KEY_TASKMANAGER);     break;
1125                 case 0x190: map_key_clear(KEY_JOURNAL);         break;
1126                 case 0x191: map_key_clear(KEY_FINANCE);         break;
1127                 case 0x192: map_key_clear(KEY_CALC);            break;
1128                 case 0x193: map_key_clear(KEY_PLAYER);          break;
1129                 case 0x194: map_key_clear(KEY_FILE);            break;
1130                 case 0x196: map_key_clear(KEY_WWW);             break;
1131                 case 0x199: map_key_clear(KEY_CHAT);            break;
1132                 case 0x19c: map_key_clear(KEY_LOGOFF);          break;
1133                 case 0x19e: map_key_clear(KEY_COFFEE);          break;
1134                 case 0x19f: map_key_clear(KEY_CONTROLPANEL);            break;
1135                 case 0x1a2: map_key_clear(KEY_APPSELECT);               break;
1136                 case 0x1a3: map_key_clear(KEY_NEXT);            break;
1137                 case 0x1a4: map_key_clear(KEY_PREVIOUS);        break;
1138                 case 0x1a6: map_key_clear(KEY_HELP);            break;
1139                 case 0x1a7: map_key_clear(KEY_DOCUMENTS);       break;
1140                 case 0x1ab: map_key_clear(KEY_SPELLCHECK);      break;
1141                 case 0x1ae: map_key_clear(KEY_KEYBOARD);        break;
1142                 case 0x1b1: map_key_clear(KEY_SCREENSAVER);             break;
1143                 case 0x1b4: map_key_clear(KEY_FILE);            break;
1144                 case 0x1b6: map_key_clear(KEY_IMAGES);          break;
1145                 case 0x1b7: map_key_clear(KEY_AUDIO);           break;
1146                 case 0x1b8: map_key_clear(KEY_VIDEO);           break;
1147                 case 0x1bc: map_key_clear(KEY_MESSENGER);       break;
1148                 case 0x1bd: map_key_clear(KEY_INFO);            break;
1149                 case 0x1cb: map_key_clear(KEY_ASSISTANT);       break;
1150                 case 0x201: map_key_clear(KEY_NEW);             break;
1151                 case 0x202: map_key_clear(KEY_OPEN);            break;
1152                 case 0x203: map_key_clear(KEY_CLOSE);           break;
1153                 case 0x204: map_key_clear(KEY_EXIT);            break;
1154                 case 0x207: map_key_clear(KEY_SAVE);            break;
1155                 case 0x208: map_key_clear(KEY_PRINT);           break;
1156                 case 0x209: map_key_clear(KEY_PROPS);           break;
1157                 case 0x21a: map_key_clear(KEY_UNDO);            break;
1158                 case 0x21b: map_key_clear(KEY_COPY);            break;
1159                 case 0x21c: map_key_clear(KEY_CUT);             break;
1160                 case 0x21d: map_key_clear(KEY_PASTE);           break;
1161                 case 0x21f: map_key_clear(KEY_FIND);            break;
1162                 case 0x221: map_key_clear(KEY_SEARCH);          break;
1163                 case 0x222: map_key_clear(KEY_GOTO);            break;
1164                 case 0x223: map_key_clear(KEY_HOMEPAGE);        break;
1165                 case 0x224: map_key_clear(KEY_BACK);            break;
1166                 case 0x225: map_key_clear(KEY_FORWARD);         break;
1167                 case 0x226: map_key_clear(KEY_STOP);            break;
1168                 case 0x227: map_key_clear(KEY_REFRESH);         break;
1169                 case 0x22a: map_key_clear(KEY_BOOKMARKS);       break;
1170                 case 0x22d: map_key_clear(KEY_ZOOMIN);          break;
1171                 case 0x22e: map_key_clear(KEY_ZOOMOUT);         break;
1172                 case 0x22f: map_key_clear(KEY_ZOOMRESET);       break;
1173                 case 0x232: map_key_clear(KEY_FULL_SCREEN);     break;
1174                 case 0x233: map_key_clear(KEY_SCROLLUP);        break;
1175                 case 0x234: map_key_clear(KEY_SCROLLDOWN);      break;
1176                 case 0x238: /* AC Pan */
1177                         set_bit(REL_HWHEEL, input->relbit);
1178                         map_rel(REL_HWHEEL_HI_RES);
1179                         break;
1180                 case 0x23d: map_key_clear(KEY_EDIT);            break;
1181                 case 0x25f: map_key_clear(KEY_CANCEL);          break;
1182                 case 0x269: map_key_clear(KEY_INSERT);          break;
1183                 case 0x26a: map_key_clear(KEY_DELETE);          break;
1184                 case 0x279: map_key_clear(KEY_REDO);            break;
1185
1186                 case 0x289: map_key_clear(KEY_REPLY);           break;
1187                 case 0x28b: map_key_clear(KEY_FORWARDMAIL);     break;
1188                 case 0x28c: map_key_clear(KEY_SEND);            break;
1189
1190                 case 0x29d: map_key_clear(KEY_KBD_LAYOUT_NEXT); break;
1191
1192                 case 0x2a2: map_key_clear(KEY_ALL_APPLICATIONS);        break;
1193
1194                 case 0x2c7: map_key_clear(KEY_KBDINPUTASSIST_PREV);             break;
1195                 case 0x2c8: map_key_clear(KEY_KBDINPUTASSIST_NEXT);             break;
1196                 case 0x2c9: map_key_clear(KEY_KBDINPUTASSIST_PREVGROUP);                break;
1197                 case 0x2ca: map_key_clear(KEY_KBDINPUTASSIST_NEXTGROUP);                break;
1198                 case 0x2cb: map_key_clear(KEY_KBDINPUTASSIST_ACCEPT);   break;
1199                 case 0x2cc: map_key_clear(KEY_KBDINPUTASSIST_CANCEL);   break;
1200
1201                 case 0x29f: map_key_clear(KEY_SCALE);           break;
1202
1203                 default: map_key_clear(KEY_UNKNOWN);
1204                 }
1205                 break;
1206
1207         case HID_UP_GENDEVCTRLS:
1208                 switch (usage->hid) {
1209                 case HID_DC_BATTERYSTRENGTH:
1210                         hidinput_setup_battery(device, HID_INPUT_REPORT, field, false);
1211                         usage->type = EV_PWR;
1212                         return;
1213                 }
1214                 goto unknown;
1215
1216         case HID_UP_BATTERY:
1217                 switch (usage->hid) {
1218                 case HID_BAT_ABSOLUTESTATEOFCHARGE:
1219                         hidinput_setup_battery(device, HID_INPUT_REPORT, field, true);
1220                         usage->type = EV_PWR;
1221                         return;
1222                 }
1223                 goto unknown;
1224
1225         case HID_UP_HPVENDOR:   /* Reported on a Dutch layout HP5308 */
1226                 set_bit(EV_REP, input->evbit);
1227                 switch (usage->hid & HID_USAGE) {
1228                 case 0x021: map_key_clear(KEY_PRINT);           break;
1229                 case 0x070: map_key_clear(KEY_HP);              break;
1230                 case 0x071: map_key_clear(KEY_CAMERA);          break;
1231                 case 0x072: map_key_clear(KEY_SOUND);           break;
1232                 case 0x073: map_key_clear(KEY_QUESTION);        break;
1233                 case 0x080: map_key_clear(KEY_EMAIL);           break;
1234                 case 0x081: map_key_clear(KEY_CHAT);            break;
1235                 case 0x082: map_key_clear(KEY_SEARCH);          break;
1236                 case 0x083: map_key_clear(KEY_CONNECT);         break;
1237                 case 0x084: map_key_clear(KEY_FINANCE);         break;
1238                 case 0x085: map_key_clear(KEY_SPORT);           break;
1239                 case 0x086: map_key_clear(KEY_SHOP);            break;
1240                 default:    goto ignore;
1241                 }
1242                 break;
1243
1244         case HID_UP_HPVENDOR2:
1245                 set_bit(EV_REP, input->evbit);
1246                 switch (usage->hid & HID_USAGE) {
1247                 case 0x001: map_key_clear(KEY_MICMUTE);         break;
1248                 case 0x003: map_key_clear(KEY_BRIGHTNESSDOWN);  break;
1249                 case 0x004: map_key_clear(KEY_BRIGHTNESSUP);    break;
1250                 default:    goto ignore;
1251                 }
1252                 break;
1253
1254         case HID_UP_MSVENDOR:
1255                 goto ignore;
1256
1257         case HID_UP_CUSTOM: /* Reported on Logitech and Apple USB keyboards */
1258                 set_bit(EV_REP, input->evbit);
1259                 goto ignore;
1260
1261         case HID_UP_LOGIVENDOR:
1262                 /* intentional fallback */
1263         case HID_UP_LOGIVENDOR2:
1264                 /* intentional fallback */
1265         case HID_UP_LOGIVENDOR3:
1266                 goto ignore;
1267
1268         case HID_UP_PID:
1269                 switch (usage->hid & HID_USAGE) {
1270                 case 0xa4: map_key_clear(BTN_DEAD);     break;
1271                 default: goto ignore;
1272                 }
1273                 break;
1274
1275         default:
1276         unknown:
1277                 if (field->report_size == 1) {
1278                         if (field->report->type == HID_OUTPUT_REPORT) {
1279                                 map_led(LED_MISC);
1280                                 break;
1281                         }
1282                         map_key(BTN_MISC);
1283                         break;
1284                 }
1285                 if (field->flags & HID_MAIN_ITEM_RELATIVE) {
1286                         map_rel(REL_MISC);
1287                         break;
1288                 }
1289                 map_abs(ABS_MISC);
1290                 break;
1291         }
1292
1293 mapped:
1294         /* Mapping failed, bail out */
1295         if (!bit)
1296                 return;
1297
1298         if (device->driver->input_mapped &&
1299             device->driver->input_mapped(device, hidinput, field, usage,
1300                                          &bit, &max) < 0) {
1301                 /*
1302                  * The driver indicated that no further generic handling
1303                  * of the usage is desired.
1304                  */
1305                 return;
1306         }
1307
1308         set_bit(usage->type, input->evbit);
1309
1310         /*
1311          * This part is *really* controversial:
1312          * - HID aims at being generic so we should do our best to export
1313          *   all incoming events
1314          * - HID describes what events are, so there is no reason for ABS_X
1315          *   to be mapped to ABS_Y
1316          * - HID is using *_MISC+N as a default value, but nothing prevents
1317          *   *_MISC+N to overwrite a legitimate even, which confuses userspace
1318          *   (for instance ABS_MISC + 7 is ABS_MT_SLOT, which has a different
1319          *   processing)
1320          *
1321          * If devices still want to use this (at their own risk), they will
1322          * have to use the quirk HID_QUIRK_INCREMENT_USAGE_ON_DUPLICATE, but
1323          * the default should be a reliable mapping.
1324          */
1325         while (usage->code <= max && test_and_set_bit(usage->code, bit)) {
1326                 if (device->quirks & HID_QUIRK_INCREMENT_USAGE_ON_DUPLICATE) {
1327                         usage->code = find_next_zero_bit(bit,
1328                                                          max + 1,
1329                                                          usage->code);
1330                 } else {
1331                         device->status |= HID_STAT_DUP_DETECTED;
1332                         goto ignore;
1333                 }
1334         }
1335
1336         if (usage->code > max)
1337                 goto ignore;
1338
1339         if (usage->type == EV_ABS) {
1340
1341                 int a = field->logical_minimum;
1342                 int b = field->logical_maximum;
1343
1344                 if ((device->quirks & HID_QUIRK_BADPAD) && (usage->code == ABS_X || usage->code == ABS_Y)) {
1345                         a = field->logical_minimum = 0;
1346                         b = field->logical_maximum = 255;
1347                 }
1348
1349                 if (field->application == HID_GD_GAMEPAD || field->application == HID_GD_JOYSTICK)
1350                         input_set_abs_params(input, usage->code, a, b, (b - a) >> 8, (b - a) >> 4);
1351                 else    input_set_abs_params(input, usage->code, a, b, 0, 0);
1352
1353                 input_abs_set_res(input, usage->code,
1354                                   hidinput_calc_abs_res(field, usage->code));
1355
1356                 /* use a larger default input buffer for MT devices */
1357                 if (usage->code == ABS_MT_POSITION_X && input->hint_events_per_packet == 0)
1358                         input_set_events_per_packet(input, 60);
1359         }
1360
1361         if (usage->type == EV_ABS &&
1362             (usage->hat_min < usage->hat_max || usage->hat_dir)) {
1363                 int i;
1364                 for (i = usage->code; i < usage->code + 2 && i <= max; i++) {
1365                         input_set_abs_params(input, i, -1, 1, 0, 0);
1366                         set_bit(i, input->absbit);
1367                 }
1368                 if (usage->hat_dir && !field->dpad)
1369                         field->dpad = usage->code;
1370         }
1371
1372         /* for those devices which produce Consumer volume usage as relative,
1373          * we emulate pressing volumeup/volumedown appropriate number of times
1374          * in hidinput_hid_event()
1375          */
1376         if ((usage->type == EV_ABS) && (field->flags & HID_MAIN_ITEM_RELATIVE) &&
1377                         (usage->code == ABS_VOLUME)) {
1378                 set_bit(KEY_VOLUMEUP, input->keybit);
1379                 set_bit(KEY_VOLUMEDOWN, input->keybit);
1380         }
1381
1382         if (usage->type == EV_KEY) {
1383                 set_bit(EV_MSC, input->evbit);
1384                 set_bit(MSC_SCAN, input->mscbit);
1385         }
1386
1387         return;
1388
1389 ignore:
1390         usage->type = 0;
1391         usage->code = 0;
1392 }
1393
1394 static void hidinput_handle_scroll(struct hid_usage *usage,
1395                                    struct input_dev *input,
1396                                    __s32 value)
1397 {
1398         int code;
1399         int hi_res, lo_res;
1400
1401         if (value == 0)
1402                 return;
1403
1404         if (usage->code == REL_WHEEL_HI_RES)
1405                 code = REL_WHEEL;
1406         else
1407                 code = REL_HWHEEL;
1408
1409         /*
1410          * Windows reports one wheel click as value 120. Where a high-res
1411          * scroll wheel is present, a fraction of 120 is reported instead.
1412          * Our REL_WHEEL_HI_RES axis does the same because all HW must
1413          * adhere to the 120 expectation.
1414          */
1415         hi_res = value * 120/usage->resolution_multiplier;
1416
1417         usage->wheel_accumulated += hi_res;
1418         lo_res = usage->wheel_accumulated/120;
1419         if (lo_res)
1420                 usage->wheel_accumulated -= lo_res * 120;
1421
1422         input_event(input, EV_REL, code, lo_res);
1423         input_event(input, EV_REL, usage->code, hi_res);
1424 }
1425
1426 static void hid_report_release_tool(struct hid_report *report, struct input_dev *input,
1427                                     unsigned int tool)
1428 {
1429         /* if the given tool is not currently reported, ignore */
1430         if (!test_bit(tool, input->key))
1431                 return;
1432
1433         /*
1434          * if the given tool was previously set, release it,
1435          * release any TOUCH and send an EV_SYN
1436          */
1437         input_event(input, EV_KEY, BTN_TOUCH, 0);
1438         input_event(input, EV_KEY, tool, 0);
1439         input_event(input, EV_SYN, SYN_REPORT, 0);
1440
1441         report->tool = 0;
1442 }
1443
1444 static void hid_report_set_tool(struct hid_report *report, struct input_dev *input,
1445                                 unsigned int new_tool)
1446 {
1447         if (report->tool != new_tool)
1448                 hid_report_release_tool(report, input, report->tool);
1449
1450         input_event(input, EV_KEY, new_tool, 1);
1451         report->tool = new_tool;
1452 }
1453
1454 void hidinput_hid_event(struct hid_device *hid, struct hid_field *field, struct hid_usage *usage, __s32 value)
1455 {
1456         struct input_dev *input;
1457         struct hid_report *report = field->report;
1458         unsigned *quirks = &hid->quirks;
1459
1460         if (!usage->type)
1461                 return;
1462
1463         if (usage->type == EV_PWR) {
1464                 hidinput_update_battery(hid, value);
1465                 return;
1466         }
1467
1468         if (!field->hidinput)
1469                 return;
1470
1471         input = field->hidinput->input;
1472
1473         if (usage->hat_min < usage->hat_max || usage->hat_dir) {
1474                 int hat_dir = usage->hat_dir;
1475                 if (!hat_dir)
1476                         hat_dir = (value - usage->hat_min) * 8 / (usage->hat_max - usage->hat_min + 1) + 1;
1477                 if (hat_dir < 0 || hat_dir > 8) hat_dir = 0;
1478                 input_event(input, usage->type, usage->code    , hid_hat_to_axis[hat_dir].x);
1479                 input_event(input, usage->type, usage->code + 1, hid_hat_to_axis[hat_dir].y);
1480                 return;
1481         }
1482
1483         /*
1484          * Ignore out-of-range values as per HID specification,
1485          * section 5.10 and 6.2.25, when NULL state bit is present.
1486          * When it's not, clamp the value to match Microsoft's input
1487          * driver as mentioned in "Required HID usages for digitizers":
1488          * https://msdn.microsoft.com/en-us/library/windows/hardware/dn672278(v=vs.85).asp
1489          *
1490          * The logical_minimum < logical_maximum check is done so that we
1491          * don't unintentionally discard values sent by devices which
1492          * don't specify logical min and max.
1493          */
1494         if ((field->flags & HID_MAIN_ITEM_VARIABLE) &&
1495             field->logical_minimum < field->logical_maximum) {
1496                 if (field->flags & HID_MAIN_ITEM_NULL_STATE &&
1497                     (value < field->logical_minimum ||
1498                      value > field->logical_maximum)) {
1499                         dbg_hid("Ignoring out-of-range value %x\n", value);
1500                         return;
1501                 }
1502                 value = clamp(value,
1503                               field->logical_minimum,
1504                               field->logical_maximum);
1505         }
1506
1507         switch (usage->hid) {
1508         case HID_DG_ERASER:
1509                 report->tool_active |= !!value;
1510
1511                 /*
1512                  * if eraser is set, we must enforce BTN_TOOL_RUBBER
1513                  * to accommodate for devices not following the spec.
1514                  */
1515                 if (value)
1516                         hid_report_set_tool(report, input, BTN_TOOL_RUBBER);
1517                 else if (report->tool != BTN_TOOL_RUBBER)
1518                         /* value is off, tool is not rubber, ignore */
1519                         return;
1520
1521                 /* let hid-input set BTN_TOUCH */
1522                 break;
1523
1524         case HID_DG_INVERT:
1525                 report->tool_active |= !!value;
1526
1527                 /*
1528                  * If invert is set, we store BTN_TOOL_RUBBER.
1529                  */
1530                 if (value)
1531                         hid_report_set_tool(report, input, BTN_TOOL_RUBBER);
1532                 else if (!report->tool_active)
1533                         /* tool_active not set means Invert and Eraser are not set */
1534                         hid_report_release_tool(report, input, BTN_TOOL_RUBBER);
1535
1536                 /* no further processing */
1537                 return;
1538
1539         case HID_DG_INRANGE:
1540                 report->tool_active |= !!value;
1541
1542                 if (report->tool_active) {
1543                         /*
1544                          * if tool is not set but is marked as active,
1545                          * assume ours
1546                          */
1547                         if (!report->tool)
1548                                 report->tool = usage->code;
1549
1550                         /* drivers may have changed the value behind our back, resend it */
1551                         hid_report_set_tool(report, input, report->tool);
1552                 } else {
1553                         hid_report_release_tool(report, input, usage->code);
1554                 }
1555
1556                 /* reset tool_active for the next event */
1557                 report->tool_active = false;
1558
1559                 /* no further processing */
1560                 return;
1561
1562         case HID_DG_TIPSWITCH:
1563                 report->tool_active |= !!value;
1564
1565                 /* if tool is set to RUBBER we should ignore the current value */
1566                 if (report->tool == BTN_TOOL_RUBBER)
1567                         return;
1568
1569                 break;
1570
1571         case HID_DG_TIPPRESSURE:
1572                 if (*quirks & HID_QUIRK_NOTOUCH) {
1573                         int a = field->logical_minimum;
1574                         int b = field->logical_maximum;
1575
1576                         if (value > a + ((b - a) >> 3)) {
1577                                 input_event(input, EV_KEY, BTN_TOUCH, 1);
1578                                 report->tool_active = true;
1579                         }
1580                 }
1581                 break;
1582
1583         case HID_UP_PID | 0x83UL: /* Simultaneous Effects Max */
1584                 dbg_hid("Maximum Effects - %d\n",value);
1585                 return;
1586
1587         case HID_UP_PID | 0x7fUL:
1588                 dbg_hid("PID Pool Report\n");
1589                 return;
1590         }
1591
1592         switch (usage->type) {
1593         case EV_KEY:
1594                 if (usage->code == 0) /* Key 0 is "unassigned", not KEY_UNKNOWN */
1595                         return;
1596                 break;
1597
1598         case EV_REL:
1599                 if (usage->code == REL_WHEEL_HI_RES ||
1600                     usage->code == REL_HWHEEL_HI_RES) {
1601                         hidinput_handle_scroll(usage, input, value);
1602                         return;
1603                 }
1604                 break;
1605
1606         case EV_ABS:
1607                 if ((field->flags & HID_MAIN_ITEM_RELATIVE) &&
1608                     usage->code == ABS_VOLUME) {
1609                         int count = abs(value);
1610                         int direction = value > 0 ? KEY_VOLUMEUP : KEY_VOLUMEDOWN;
1611                         int i;
1612
1613                         for (i = 0; i < count; i++) {
1614                                 input_event(input, EV_KEY, direction, 1);
1615                                 input_sync(input);
1616                                 input_event(input, EV_KEY, direction, 0);
1617                                 input_sync(input);
1618                         }
1619                         return;
1620
1621                 } else if (((*quirks & HID_QUIRK_X_INVERT) && usage->code == ABS_X) ||
1622                            ((*quirks & HID_QUIRK_Y_INVERT) && usage->code == ABS_Y))
1623                         value = field->logical_maximum - value;
1624                 break;
1625         }
1626
1627         /*
1628          * Ignore reports for absolute data if the data didn't change. This is
1629          * not only an optimization but also fixes 'dead' key reports. Some
1630          * RollOver implementations for localized keys (like BACKSLASH/PIPE; HID
1631          * 0x31 and 0x32) report multiple keys, even though a localized keyboard
1632          * can only have one of them physically available. The 'dead' keys
1633          * report constant 0. As all map to the same keycode, they'd confuse
1634          * the input layer. If we filter the 'dead' keys on the HID level, we
1635          * skip the keycode translation and only forward real events.
1636          */
1637         if (!(field->flags & (HID_MAIN_ITEM_RELATIVE |
1638                               HID_MAIN_ITEM_BUFFERED_BYTE)) &&
1639                               (field->flags & HID_MAIN_ITEM_VARIABLE) &&
1640             usage->usage_index < field->maxusage &&
1641             value == field->value[usage->usage_index])
1642                 return;
1643
1644         /* report the usage code as scancode if the key status has changed */
1645         if (usage->type == EV_KEY &&
1646             (!test_bit(usage->code, input->key)) == value)
1647                 input_event(input, EV_MSC, MSC_SCAN, usage->hid);
1648
1649         input_event(input, usage->type, usage->code, value);
1650
1651         if ((field->flags & HID_MAIN_ITEM_RELATIVE) &&
1652             usage->type == EV_KEY && value) {
1653                 input_sync(input);
1654                 input_event(input, usage->type, usage->code, 0);
1655         }
1656 }
1657
1658 void hidinput_report_event(struct hid_device *hid, struct hid_report *report)
1659 {
1660         struct hid_input *hidinput;
1661
1662         if (hid->quirks & HID_QUIRK_NO_INPUT_SYNC)
1663                 return;
1664
1665         list_for_each_entry(hidinput, &hid->inputs, list)
1666                 input_sync(hidinput->input);
1667 }
1668 EXPORT_SYMBOL_GPL(hidinput_report_event);
1669
1670 static int hidinput_find_field(struct hid_device *hid, unsigned int type,
1671                                unsigned int code, struct hid_field **field)
1672 {
1673         struct hid_report *report;
1674         int i, j;
1675
1676         list_for_each_entry(report, &hid->report_enum[HID_OUTPUT_REPORT].report_list, list) {
1677                 for (i = 0; i < report->maxfield; i++) {
1678                         *field = report->field[i];
1679                         for (j = 0; j < (*field)->maxusage; j++)
1680                                 if ((*field)->usage[j].type == type && (*field)->usage[j].code == code)
1681                                         return j;
1682                 }
1683         }
1684         return -1;
1685 }
1686
1687 struct hid_field *hidinput_get_led_field(struct hid_device *hid)
1688 {
1689         struct hid_report *report;
1690         struct hid_field *field;
1691         int i, j;
1692
1693         list_for_each_entry(report,
1694                             &hid->report_enum[HID_OUTPUT_REPORT].report_list,
1695                             list) {
1696                 for (i = 0; i < report->maxfield; i++) {
1697                         field = report->field[i];
1698                         for (j = 0; j < field->maxusage; j++)
1699                                 if (field->usage[j].type == EV_LED)
1700                                         return field;
1701                 }
1702         }
1703         return NULL;
1704 }
1705 EXPORT_SYMBOL_GPL(hidinput_get_led_field);
1706
1707 unsigned int hidinput_count_leds(struct hid_device *hid)
1708 {
1709         struct hid_report *report;
1710         struct hid_field *field;
1711         int i, j;
1712         unsigned int count = 0;
1713
1714         list_for_each_entry(report,
1715                             &hid->report_enum[HID_OUTPUT_REPORT].report_list,
1716                             list) {
1717                 for (i = 0; i < report->maxfield; i++) {
1718                         field = report->field[i];
1719                         for (j = 0; j < field->maxusage; j++)
1720                                 if (field->usage[j].type == EV_LED &&
1721                                     field->value[j])
1722                                         count += 1;
1723                 }
1724         }
1725         return count;
1726 }
1727 EXPORT_SYMBOL_GPL(hidinput_count_leds);
1728
1729 static void hidinput_led_worker(struct work_struct *work)
1730 {
1731         struct hid_device *hid = container_of(work, struct hid_device,
1732                                               led_work);
1733         struct hid_field *field;
1734         struct hid_report *report;
1735         int ret;
1736         u32 len;
1737         __u8 *buf;
1738
1739         field = hidinput_get_led_field(hid);
1740         if (!field)
1741                 return;
1742
1743         /*
1744          * field->report is accessed unlocked regarding HID core. So there might
1745          * be another incoming SET-LED request from user-space, which changes
1746          * the LED state while we assemble our outgoing buffer. However, this
1747          * doesn't matter as hid_output_report() correctly converts it into a
1748          * boolean value no matter what information is currently set on the LED
1749          * field (even garbage). So the remote device will always get a valid
1750          * request.
1751          * And in case we send a wrong value, a next led worker is spawned
1752          * for every SET-LED request so the following worker will send the
1753          * correct value, guaranteed!
1754          */
1755
1756         report = field->report;
1757
1758         /* use custom SET_REPORT request if possible (asynchronous) */
1759         if (hid->ll_driver->request)
1760                 return hid->ll_driver->request(hid, report, HID_REQ_SET_REPORT);
1761
1762         /* fall back to generic raw-output-report */
1763         len = hid_report_len(report);
1764         buf = hid_alloc_report_buf(report, GFP_KERNEL);
1765         if (!buf)
1766                 return;
1767
1768         hid_output_report(report, buf);
1769         /* synchronous output report */
1770         ret = hid_hw_output_report(hid, buf, len);
1771         if (ret == -ENOSYS)
1772                 hid_hw_raw_request(hid, report->id, buf, len, HID_OUTPUT_REPORT,
1773                                 HID_REQ_SET_REPORT);
1774         kfree(buf);
1775 }
1776
1777 static int hidinput_input_event(struct input_dev *dev, unsigned int type,
1778                                 unsigned int code, int value)
1779 {
1780         struct hid_device *hid = input_get_drvdata(dev);
1781         struct hid_field *field;
1782         int offset;
1783
1784         if (type == EV_FF)
1785                 return input_ff_event(dev, type, code, value);
1786
1787         if (type != EV_LED)
1788                 return -1;
1789
1790         if ((offset = hidinput_find_field(hid, type, code, &field)) == -1) {
1791                 hid_warn(dev, "event field not found\n");
1792                 return -1;
1793         }
1794
1795         hid_set_field(field, offset, value);
1796
1797         schedule_work(&hid->led_work);
1798         return 0;
1799 }
1800
1801 static int hidinput_open(struct input_dev *dev)
1802 {
1803         struct hid_device *hid = input_get_drvdata(dev);
1804
1805         return hid_hw_open(hid);
1806 }
1807
1808 static void hidinput_close(struct input_dev *dev)
1809 {
1810         struct hid_device *hid = input_get_drvdata(dev);
1811
1812         hid_hw_close(hid);
1813 }
1814
1815 static bool __hidinput_change_resolution_multipliers(struct hid_device *hid,
1816                 struct hid_report *report, bool use_logical_max)
1817 {
1818         struct hid_usage *usage;
1819         bool update_needed = false;
1820         bool get_report_completed = false;
1821         int i, j;
1822
1823         if (report->maxfield == 0)
1824                 return false;
1825
1826         for (i = 0; i < report->maxfield; i++) {
1827                 __s32 value = use_logical_max ?
1828                               report->field[i]->logical_maximum :
1829                               report->field[i]->logical_minimum;
1830
1831                 /* There is no good reason for a Resolution
1832                  * Multiplier to have a count other than 1.
1833                  * Ignore that case.
1834                  */
1835                 if (report->field[i]->report_count != 1)
1836                         continue;
1837
1838                 for (j = 0; j < report->field[i]->maxusage; j++) {
1839                         usage = &report->field[i]->usage[j];
1840
1841                         if (usage->hid != HID_GD_RESOLUTION_MULTIPLIER)
1842                                 continue;
1843
1844                         /*
1845                          * If we have more than one feature within this
1846                          * report we need to fill in the bits from the
1847                          * others before we can overwrite the ones for the
1848                          * Resolution Multiplier.
1849                          *
1850                          * But if we're not allowed to read from the device,
1851                          * we just bail. Such a device should not exist
1852                          * anyway.
1853                          */
1854                         if (!get_report_completed && report->maxfield > 1) {
1855                                 if (hid->quirks & HID_QUIRK_NO_INIT_REPORTS)
1856                                         return update_needed;
1857
1858                                 hid_hw_request(hid, report, HID_REQ_GET_REPORT);
1859                                 hid_hw_wait(hid);
1860                                 get_report_completed = true;
1861                         }
1862
1863                         report->field[i]->value[j] = value;
1864                         update_needed = true;
1865                 }
1866         }
1867
1868         return update_needed;
1869 }
1870
1871 static void hidinput_change_resolution_multipliers(struct hid_device *hid)
1872 {
1873         struct hid_report_enum *rep_enum;
1874         struct hid_report *rep;
1875         int ret;
1876
1877         rep_enum = &hid->report_enum[HID_FEATURE_REPORT];
1878         list_for_each_entry(rep, &rep_enum->report_list, list) {
1879                 bool update_needed = __hidinput_change_resolution_multipliers(hid,
1880                                                                      rep, true);
1881
1882                 if (update_needed) {
1883                         ret = __hid_request(hid, rep, HID_REQ_SET_REPORT);
1884                         if (ret) {
1885                                 __hidinput_change_resolution_multipliers(hid,
1886                                                                     rep, false);
1887                                 return;
1888                         }
1889                 }
1890         }
1891
1892         /* refresh our structs */
1893         hid_setup_resolution_multiplier(hid);
1894 }
1895
1896 static void report_features(struct hid_device *hid)
1897 {
1898         struct hid_driver *drv = hid->driver;
1899         struct hid_report_enum *rep_enum;
1900         struct hid_report *rep;
1901         struct hid_usage *usage;
1902         int i, j;
1903
1904         rep_enum = &hid->report_enum[HID_FEATURE_REPORT];
1905         list_for_each_entry(rep, &rep_enum->report_list, list)
1906                 for (i = 0; i < rep->maxfield; i++) {
1907                         /* Ignore if report count is out of bounds. */
1908                         if (rep->field[i]->report_count < 1)
1909                                 continue;
1910
1911                         for (j = 0; j < rep->field[i]->maxusage; j++) {
1912                                 usage = &rep->field[i]->usage[j];
1913
1914                                 /* Verify if Battery Strength feature is available */
1915                                 if (usage->hid == HID_DC_BATTERYSTRENGTH)
1916                                         hidinput_setup_battery(hid, HID_FEATURE_REPORT,
1917                                                                rep->field[i], false);
1918
1919                                 if (drv->feature_mapping)
1920                                         drv->feature_mapping(hid, rep->field[i], usage);
1921                         }
1922                 }
1923 }
1924
1925 static struct hid_input *hidinput_allocate(struct hid_device *hid,
1926                                            unsigned int application)
1927 {
1928         struct hid_input *hidinput = kzalloc(sizeof(*hidinput), GFP_KERNEL);
1929         struct input_dev *input_dev = input_allocate_device();
1930         const char *suffix = NULL;
1931         size_t suffix_len, name_len;
1932
1933         if (!hidinput || !input_dev)
1934                 goto fail;
1935
1936         if ((hid->quirks & HID_QUIRK_INPUT_PER_APP) &&
1937             hid->maxapplication > 1) {
1938                 switch (application) {
1939                 case HID_GD_KEYBOARD:
1940                         suffix = "Keyboard";
1941                         break;
1942                 case HID_GD_KEYPAD:
1943                         suffix = "Keypad";
1944                         break;
1945                 case HID_GD_MOUSE:
1946                         suffix = "Mouse";
1947                         break;
1948                 case HID_DG_PEN:
1949                         /*
1950                          * yes, there is an issue here:
1951                          *  DG_PEN -> "Stylus"
1952                          *  DG_STYLUS -> "Pen"
1953                          * But changing this now means users with config snippets
1954                          * will have to change it and the test suite will not be happy.
1955                          */
1956                         suffix = "Stylus";
1957                         break;
1958                 case HID_DG_STYLUS:
1959                         suffix = "Pen";
1960                         break;
1961                 case HID_DG_TOUCHSCREEN:
1962                         suffix = "Touchscreen";
1963                         break;
1964                 case HID_DG_TOUCHPAD:
1965                         suffix = "Touchpad";
1966                         break;
1967                 case HID_GD_SYSTEM_CONTROL:
1968                         suffix = "System Control";
1969                         break;
1970                 case HID_CP_CONSUMER_CONTROL:
1971                         suffix = "Consumer Control";
1972                         break;
1973                 case HID_GD_WIRELESS_RADIO_CTLS:
1974                         suffix = "Wireless Radio Control";
1975                         break;
1976                 case HID_GD_SYSTEM_MULTIAXIS:
1977                         suffix = "System Multi Axis";
1978                         break;
1979                 default:
1980                         break;
1981                 }
1982         }
1983
1984         if (suffix) {
1985                 name_len = strlen(hid->name);
1986                 suffix_len = strlen(suffix);
1987                 if ((name_len < suffix_len) ||
1988                     strcmp(hid->name + name_len - suffix_len, suffix)) {
1989                         hidinput->name = kasprintf(GFP_KERNEL, "%s %s",
1990                                                    hid->name, suffix);
1991                         if (!hidinput->name)
1992                                 goto fail;
1993                 }
1994         }
1995
1996         input_set_drvdata(input_dev, hid);
1997         input_dev->event = hidinput_input_event;
1998         input_dev->open = hidinput_open;
1999         input_dev->close = hidinput_close;
2000         input_dev->setkeycode = hidinput_setkeycode;
2001         input_dev->getkeycode = hidinput_getkeycode;
2002
2003         input_dev->name = hidinput->name ? hidinput->name : hid->name;
2004         input_dev->phys = hid->phys;
2005         input_dev->uniq = hid->uniq;
2006         input_dev->id.bustype = hid->bus;
2007         input_dev->id.vendor  = hid->vendor;
2008         input_dev->id.product = hid->product;
2009         input_dev->id.version = hid->version;
2010         input_dev->dev.parent = &hid->dev;
2011
2012         hidinput->input = input_dev;
2013         hidinput->application = application;
2014         list_add_tail(&hidinput->list, &hid->inputs);
2015
2016         INIT_LIST_HEAD(&hidinput->reports);
2017
2018         return hidinput;
2019
2020 fail:
2021         kfree(hidinput);
2022         input_free_device(input_dev);
2023         hid_err(hid, "Out of memory during hid input probe\n");
2024         return NULL;
2025 }
2026
2027 static bool hidinput_has_been_populated(struct hid_input *hidinput)
2028 {
2029         int i;
2030         unsigned long r = 0;
2031
2032         for (i = 0; i < BITS_TO_LONGS(EV_CNT); i++)
2033                 r |= hidinput->input->evbit[i];
2034
2035         for (i = 0; i < BITS_TO_LONGS(KEY_CNT); i++)
2036                 r |= hidinput->input->keybit[i];
2037
2038         for (i = 0; i < BITS_TO_LONGS(REL_CNT); i++)
2039                 r |= hidinput->input->relbit[i];
2040
2041         for (i = 0; i < BITS_TO_LONGS(ABS_CNT); i++)
2042                 r |= hidinput->input->absbit[i];
2043
2044         for (i = 0; i < BITS_TO_LONGS(MSC_CNT); i++)
2045                 r |= hidinput->input->mscbit[i];
2046
2047         for (i = 0; i < BITS_TO_LONGS(LED_CNT); i++)
2048                 r |= hidinput->input->ledbit[i];
2049
2050         for (i = 0; i < BITS_TO_LONGS(SND_CNT); i++)
2051                 r |= hidinput->input->sndbit[i];
2052
2053         for (i = 0; i < BITS_TO_LONGS(FF_CNT); i++)
2054                 r |= hidinput->input->ffbit[i];
2055
2056         for (i = 0; i < BITS_TO_LONGS(SW_CNT); i++)
2057                 r |= hidinput->input->swbit[i];
2058
2059         return !!r;
2060 }
2061
2062 static void hidinput_cleanup_hidinput(struct hid_device *hid,
2063                 struct hid_input *hidinput)
2064 {
2065         struct hid_report *report;
2066         int i, k;
2067
2068         list_del(&hidinput->list);
2069         input_free_device(hidinput->input);
2070         kfree(hidinput->name);
2071
2072         for (k = HID_INPUT_REPORT; k <= HID_OUTPUT_REPORT; k++) {
2073                 if (k == HID_OUTPUT_REPORT &&
2074                         hid->quirks & HID_QUIRK_SKIP_OUTPUT_REPORTS)
2075                         continue;
2076
2077                 list_for_each_entry(report, &hid->report_enum[k].report_list,
2078                                     list) {
2079
2080                         for (i = 0; i < report->maxfield; i++)
2081                                 if (report->field[i]->hidinput == hidinput)
2082                                         report->field[i]->hidinput = NULL;
2083                 }
2084         }
2085
2086         kfree(hidinput);
2087 }
2088
2089 static struct hid_input *hidinput_match(struct hid_report *report)
2090 {
2091         struct hid_device *hid = report->device;
2092         struct hid_input *hidinput;
2093
2094         list_for_each_entry(hidinput, &hid->inputs, list) {
2095                 if (hidinput->report &&
2096                     hidinput->report->id == report->id)
2097                         return hidinput;
2098         }
2099
2100         return NULL;
2101 }
2102
2103 static struct hid_input *hidinput_match_application(struct hid_report *report)
2104 {
2105         struct hid_device *hid = report->device;
2106         struct hid_input *hidinput;
2107
2108         list_for_each_entry(hidinput, &hid->inputs, list) {
2109                 if (hidinput->application == report->application)
2110                         return hidinput;
2111
2112                 /*
2113                  * Keep SystemControl and ConsumerControl applications together
2114                  * with the main keyboard, if present.
2115                  */
2116                 if ((report->application == HID_GD_SYSTEM_CONTROL ||
2117                      report->application == HID_CP_CONSUMER_CONTROL) &&
2118                     hidinput->application == HID_GD_KEYBOARD) {
2119                         return hidinput;
2120                 }
2121         }
2122
2123         return NULL;
2124 }
2125
2126 static inline void hidinput_configure_usages(struct hid_input *hidinput,
2127                                              struct hid_report *report)
2128 {
2129         int i, j, k;
2130         int first_field_index = 0;
2131         int slot_collection_index = -1;
2132         int prev_collection_index = -1;
2133         unsigned int slot_idx = 0;
2134         struct hid_field *field;
2135
2136         /*
2137          * First tag all the fields that are part of a slot,
2138          * a slot needs to have one Contact ID in the collection
2139          */
2140         for (i = 0; i < report->maxfield; i++) {
2141                 field = report->field[i];
2142
2143                 /* ignore fields without usage */
2144                 if (field->maxusage < 1)
2145                         continue;
2146
2147                 /*
2148                  * janitoring when collection_index changes
2149                  */
2150                 if (prev_collection_index != field->usage->collection_index) {
2151                         prev_collection_index = field->usage->collection_index;
2152                         first_field_index = i;
2153                 }
2154
2155                 /*
2156                  * if we already found a Contact ID in the collection,
2157                  * tag and continue to the next.
2158                  */
2159                 if (slot_collection_index == field->usage->collection_index) {
2160                         field->slot_idx = slot_idx;
2161                         continue;
2162                 }
2163
2164                 /* check if the current field has Contact ID */
2165                 for (j = 0; j < field->maxusage; j++) {
2166                         if (field->usage[j].hid == HID_DG_CONTACTID) {
2167                                 slot_collection_index = field->usage->collection_index;
2168                                 slot_idx++;
2169
2170                                 /*
2171                                  * mark all previous fields and this one in the
2172                                  * current collection to be slotted.
2173                                  */
2174                                 for (k = first_field_index; k <= i; k++)
2175                                         report->field[k]->slot_idx = slot_idx;
2176                                 break;
2177                         }
2178                 }
2179         }
2180
2181         for (i = 0; i < report->maxfield; i++)
2182                 for (j = 0; j < report->field[i]->maxusage; j++)
2183                         hidinput_configure_usage(hidinput, report->field[i],
2184                                                  report->field[i]->usage + j,
2185                                                  j);
2186 }
2187
2188 /*
2189  * Register the input device; print a message.
2190  * Configure the input layer interface
2191  * Read all reports and initialize the absolute field values.
2192  */
2193
2194 int hidinput_connect(struct hid_device *hid, unsigned int force)
2195 {
2196         struct hid_driver *drv = hid->driver;
2197         struct hid_report *report;
2198         struct hid_input *next, *hidinput = NULL;
2199         unsigned int application;
2200         int i, k;
2201
2202         INIT_LIST_HEAD(&hid->inputs);
2203         INIT_WORK(&hid->led_work, hidinput_led_worker);
2204
2205         hid->status &= ~HID_STAT_DUP_DETECTED;
2206
2207         if (!force) {
2208                 for (i = 0; i < hid->maxcollection; i++) {
2209                         struct hid_collection *col = &hid->collection[i];
2210                         if (col->type == HID_COLLECTION_APPLICATION ||
2211                                         col->type == HID_COLLECTION_PHYSICAL)
2212                                 if (IS_INPUT_APPLICATION(col->usage))
2213                                         break;
2214                 }
2215
2216                 if (i == hid->maxcollection)
2217                         return -1;
2218         }
2219
2220         report_features(hid);
2221
2222         for (k = HID_INPUT_REPORT; k <= HID_OUTPUT_REPORT; k++) {
2223                 if (k == HID_OUTPUT_REPORT &&
2224                         hid->quirks & HID_QUIRK_SKIP_OUTPUT_REPORTS)
2225                         continue;
2226
2227                 list_for_each_entry(report, &hid->report_enum[k].report_list, list) {
2228
2229                         if (!report->maxfield)
2230                                 continue;
2231
2232                         application = report->application;
2233
2234                         /*
2235                          * Find the previous hidinput report attached
2236                          * to this report id.
2237                          */
2238                         if (hid->quirks & HID_QUIRK_MULTI_INPUT)
2239                                 hidinput = hidinput_match(report);
2240                         else if (hid->maxapplication > 1 &&
2241                                  (hid->quirks & HID_QUIRK_INPUT_PER_APP))
2242                                 hidinput = hidinput_match_application(report);
2243
2244                         if (!hidinput) {
2245                                 hidinput = hidinput_allocate(hid, application);
2246                                 if (!hidinput)
2247                                         goto out_unwind;
2248                         }
2249
2250                         hidinput_configure_usages(hidinput, report);
2251
2252                         if (hid->quirks & HID_QUIRK_MULTI_INPUT)
2253                                 hidinput->report = report;
2254
2255                         list_add_tail(&report->hidinput_list,
2256                                       &hidinput->reports);
2257                 }
2258         }
2259
2260         hidinput_change_resolution_multipliers(hid);
2261
2262         list_for_each_entry_safe(hidinput, next, &hid->inputs, list) {
2263                 if (drv->input_configured &&
2264                     drv->input_configured(hid, hidinput))
2265                         goto out_unwind;
2266
2267                 if (!hidinput_has_been_populated(hidinput)) {
2268                         /* no need to register an input device not populated */
2269                         hidinput_cleanup_hidinput(hid, hidinput);
2270                         continue;
2271                 }
2272
2273                 if (input_register_device(hidinput->input))
2274                         goto out_unwind;
2275                 hidinput->registered = true;
2276         }
2277
2278         if (list_empty(&hid->inputs)) {
2279                 hid_err(hid, "No inputs registered, leaving\n");
2280                 goto out_unwind;
2281         }
2282
2283         if (hid->status & HID_STAT_DUP_DETECTED)
2284                 hid_dbg(hid,
2285                         "Some usages could not be mapped, please use HID_QUIRK_INCREMENT_USAGE_ON_DUPLICATE if this is legitimate.\n");
2286
2287         return 0;
2288
2289 out_unwind:
2290         /* unwind the ones we already registered */
2291         hidinput_disconnect(hid);
2292
2293         return -1;
2294 }
2295 EXPORT_SYMBOL_GPL(hidinput_connect);
2296
2297 void hidinput_disconnect(struct hid_device *hid)
2298 {
2299         struct hid_input *hidinput, *next;
2300
2301         hidinput_cleanup_battery(hid);
2302
2303         list_for_each_entry_safe(hidinput, next, &hid->inputs, list) {
2304                 list_del(&hidinput->list);
2305                 if (hidinput->registered)
2306                         input_unregister_device(hidinput->input);
2307                 else
2308                         input_free_device(hidinput->input);
2309                 kfree(hidinput->name);
2310                 kfree(hidinput);
2311         }
2312
2313         /* led_work is spawned by input_dev callbacks, but doesn't access the
2314          * parent input_dev at all. Once all input devices are removed, we
2315          * know that led_work will never get restarted, so we can cancel it
2316          * synchronously and are safe. */
2317         cancel_work_sync(&hid->led_work);
2318 }
2319 EXPORT_SYMBOL_GPL(hidinput_disconnect);