drivers/hid/wacom_sys.c

   1 /*
   2  * drivers/input/tablet/wacom_sys.c
   3  *
   4  *  USB Wacom tablet support - system specific code
   5  */
   6
   7 /*
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License as published by
  10  * the Free Software Foundation; either version 2 of the License, or
  11  * (at your option) any later version.
  12  */
  13
  14 #include "wacom_wac.h"
  15 #include "wacom.h"
  16 #include <linux/input/mt.h>
  17
  18 #define WAC_MSG_RETRIES         5
  19 #define WAC_CMD_RETRIES         10
  20
  21 #define DEV_ATTR_RW_PERM (S_IRUGO | S_IWUSR | S_IWGRP)
  22 #define DEV_ATTR_WO_PERM (S_IWUSR | S_IWGRP)
  23 #define DEV_ATTR_RO_PERM (S_IRUSR | S_IRGRP)
  24
  25 static int wacom_get_report(struct hid_device *hdev, u8 type, u8 *buf,
  26                             size_t size, unsigned int retries)
  27 {
  28         int retval;
  29
  30         do {
  31                 retval = hid_hw_raw_request(hdev, buf[0], buf, size, type,
  32                                 HID_REQ_GET_REPORT);
  33         } while ((retval == -ETIMEDOUT || retval == -EAGAIN) && --retries);
  34
  35         if (retval < 0)
  36                 hid_err(hdev, "wacom_get_report: ran out of retries "
  37                         "(last error = %d)\n", retval);
  38
  39         return retval;
  40 }
  41
  42 static int wacom_set_report(struct hid_device *hdev, u8 type, u8 *buf,
  43                             size_t size, unsigned int retries)
  44 {
  45         int retval;
  46
  47         do {
  48                 retval = hid_hw_raw_request(hdev, buf[0], buf, size, type,
  49                                 HID_REQ_SET_REPORT);
  50         } while ((retval == -ETIMEDOUT || retval == -EAGAIN) && --retries);
  51
  52         if (retval < 0)
  53                 hid_err(hdev, "wacom_set_report: ran out of retries "
  54                         "(last error = %d)\n", retval);
  55
  56         return retval;
  57 }
  58
  59 static int wacom_raw_event(struct hid_device *hdev, struct hid_report *report,
  60                 u8 *raw_data, int size)
  61 {
  62         struct wacom *wacom = hid_get_drvdata(hdev);
  63
  64         if (size > WACOM_PKGLEN_MAX)
  65                 return 1;
  66
  67         memcpy(wacom->wacom_wac.data, raw_data, size);
  68
  69         wacom_wac_irq(&wacom->wacom_wac, size);
  70
  71         return 0;
  72 }
  73
  74 static int wacom_open(struct input_dev *dev)
  75 {
  76         struct wacom *wacom = input_get_drvdata(dev);
  77
  78         return hid_hw_open(wacom->hdev);
  79 }
  80
  81 static void wacom_close(struct input_dev *dev)
  82 {
  83         struct wacom *wacom = input_get_drvdata(dev);
  84
  85         /*
  86          * wacom->hdev should never be null, but surprisingly, I had the case
  87          * once while unplugging the Wacom Wireless Receiver.
  88          */
  89         if (wacom->hdev)
  90                 hid_hw_close(wacom->hdev);
  91 }
  92
  93 /*
  94  * Calculate the resolution of the X or Y axis using hidinput_calc_abs_res.
  95  */
  96 static int wacom_calc_hid_res(int logical_extents, int physical_extents,
  97                                unsigned unit, int exponent)
  98 {
  99         struct hid_field field = {
 100                 .logical_maximum = logical_extents,
 101                 .physical_maximum = physical_extents,
 102                 .unit = unit,
 103                 .unit_exponent = exponent,
 104         };
 105
 106         return hidinput_calc_abs_res(&field, ABS_X);
 107 }
 108
 109 static void wacom_feature_mapping(struct hid_device *hdev,
 110                 struct hid_field *field, struct hid_usage *usage)
 111 {
 112         struct wacom *wacom = hid_get_drvdata(hdev);
 113         struct wacom_features *features = &wacom->wacom_wac.features;
 114         struct hid_data *hid_data = &wacom->wacom_wac.hid_data;
 115         unsigned int equivalent_usage = wacom_equivalent_usage(usage->hid);
 116         u8 *data;
 117         int ret;
 118         int n;
 119
 120         switch (equivalent_usage) {
 121         case HID_DG_CONTACTMAX:
 122                 /* leave touch_max as is if predefined */
 123                 if (!features->touch_max) {
 124                         /* read manually */
 125                         data = kzalloc(2, GFP_KERNEL);
 126                         if (!data)
 127                                 break;
 128                         data[0] = field->report->id;
 129                         ret = wacom_get_report(hdev, HID_FEATURE_REPORT,
 130                                                 data, 2, WAC_CMD_RETRIES);
 131                         if (ret == 2) {
 132                                 features->touch_max = data[1];
 133                         } else {
 134                                 features->touch_max = 16;
 135                                 hid_warn(hdev, "wacom_feature_mapping: "
 136                                          "could not get HID_DG_CONTACTMAX, "
 137                                          "defaulting to %d\n",
 138                                           features->touch_max);
 139                         }
 140                         kfree(data);
 141                 }
 142                 break;
 143         case HID_DG_INPUTMODE:
 144                 /* Ignore if value index is out of bounds. */
 145                 if (usage->usage_index >= field->report_count) {
 146                         dev_err(&hdev->dev, "HID_DG_INPUTMODE out of range\n");
 147                         break;
 148                 }
 149
 150                 hid_data->inputmode = field->report->id;
 151                 hid_data->inputmode_index = usage->usage_index;
 152                 break;
 153
 154         case HID_UP_DIGITIZER:
 155                 if (field->report->id == 0x0B &&
 156                     (field->application == WACOM_HID_G9_PEN ||
 157                      field->application == WACOM_HID_G11_PEN)) {
 158                         wacom->wacom_wac.mode_report = field->report->id;
 159                         wacom->wacom_wac.mode_value = 0;
 160                 }
 161                 break;
 162
 163         case WACOM_HID_WD_DATAMODE:
 164                 wacom->wacom_wac.mode_report = field->report->id;
 165                 wacom->wacom_wac.mode_value = 2;
 166                 break;
 167
 168         case WACOM_HID_UP_G9:
 169         case WACOM_HID_UP_G11:
 170                 if (field->report->id == 0x03 &&
 171                     (field->application == WACOM_HID_G9_TOUCHSCREEN ||
 172                      field->application == WACOM_HID_G11_TOUCHSCREEN)) {
 173                         wacom->wacom_wac.mode_report = field->report->id;
 174                         wacom->wacom_wac.mode_value = 0;
 175                 }
 176                 break;
 177         case WACOM_HID_WD_OFFSETLEFT:
 178         case WACOM_HID_WD_OFFSETTOP:
 179         case WACOM_HID_WD_OFFSETRIGHT:
 180         case WACOM_HID_WD_OFFSETBOTTOM:
 181                 /* read manually */
 182                 n = hid_report_len(field->report);
 183                 data = hid_alloc_report_buf(field->report, GFP_KERNEL);
 184                 if (!data)
 185                         break;
 186                 data[0] = field->report->id;
 187                 ret = wacom_get_report(hdev, HID_FEATURE_REPORT,
 188                                         data, n, WAC_CMD_RETRIES);
 189                 if (ret == n) {
 190                         ret = hid_report_raw_event(hdev, HID_FEATURE_REPORT,
 191                                                    data, n, 0);
 192                 } else {
 193                         hid_warn(hdev, "%s: could not retrieve sensor offsets\n",
 194                                  __func__);
 195                 }
 196                 kfree(data);
 197                 break;
 198         }
 199 }
 200
 201 /*
 202  * Interface Descriptor of wacom devices can be incomplete and
 203  * inconsistent so wacom_features table is used to store stylus
 204  * device's packet lengths, various maximum values, and tablet
 205  * resolution based on product ID's.
 206  *
 207  * For devices that contain 2 interfaces, wacom_features table is
 208  * inaccurate for the touch interface.  Since the Interface Descriptor
 209  * for touch interfaces has pretty complete data, this function exists
 210  * to query tablet for this missing information instead of hard coding in
 211  * an additional table.
 212  *
 213  * A typical Interface Descriptor for a stylus will contain a
 214  * boot mouse application collection that is not of interest and this
 215  * function will ignore it.
 216  *
 217  * It also contains a digitizer application collection that also is not
 218  * of interest since any information it contains would be duplicate
 219  * of what is in wacom_features. Usually it defines a report of an array
 220  * of bytes that could be used as max length of the stylus packet returned.
 221  * If it happens to define a Digitizer-Stylus Physical Collection then
 222  * the X and Y logical values contain valid data but it is ignored.
 223  *
 224  * A typical Interface Descriptor for a touch interface will contain a
 225  * Digitizer-Finger Physical Collection which will define both logical
 226  * X/Y maximum as well as the physical size of tablet. Since touch
 227  * interfaces haven't supported pressure or distance, this is enough
 228  * information to override invalid values in the wacom_features table.
 229  *
 230  * Intuos5 touch interface and 3rd gen Bamboo Touch do not contain useful
 231  * data. We deal with them after returning from this function.
 232  */
 233 static void wacom_usage_mapping(struct hid_device *hdev,
 234                 struct hid_field *field, struct hid_usage *usage)
 235 {
 236         struct wacom *wacom = hid_get_drvdata(hdev);
 237         struct wacom_features *features = &wacom->wacom_wac.features;
 238         bool finger = WACOM_FINGER_FIELD(field);
 239         bool pen = WACOM_PEN_FIELD(field);
 240
 241         /*
 242         * Requiring Stylus Usage will ignore boot mouse
 243         * X/Y values and some cases of invalid Digitizer X/Y
 244         * values commonly reported.
 245         */
 246         if (pen)
 247                 features->device_type |= WACOM_DEVICETYPE_PEN;
 248         else if (finger)
 249                 features->device_type |= WACOM_DEVICETYPE_TOUCH;
 250         else
 251                 return;
 252
 253         /*
 254          * Bamboo models do not support HID_DG_CONTACTMAX.
 255          * And, Bamboo Pen only descriptor contains touch.
 256          */
 257         if (features->type > BAMBOO_PT) {
 258                 /* ISDv4 touch devices at least supports one touch point */
 259                 if (finger && !features->touch_max)
 260                         features->touch_max = 1;
 261         }
 262
 263         /*
 264          * ISDv4 devices which predate HID's adoption of the
 265          * HID_DG_BARELSWITCH2 usage use 0x000D0000 in its
 266          * position instead. We can accurately detect if a
 267          * usage with that value should be HID_DG_BARRELSWITCH2
 268          * based on the surrounding usages, which have remained
 269          * constant across generations.
 270          */
 271         if (features->type == HID_GENERIC &&
 272             usage->hid == 0x000D0000 &&
 273             field->application == HID_DG_PEN &&
 274             field->physical == HID_DG_STYLUS) {
 275                 int i = usage->usage_index;
 276
 277                 if (i-4 >= 0 && i+1 < field->maxusage &&
 278                     field->usage[i-4].hid == HID_DG_TIPSWITCH &&
 279                     field->usage[i-3].hid == HID_DG_BARRELSWITCH &&
 280                     field->usage[i-2].hid == HID_DG_ERASER &&
 281                     field->usage[i-1].hid == HID_DG_INVERT &&
 282                     field->usage[i+1].hid == HID_DG_INRANGE) {
 283                         usage->hid = HID_DG_BARRELSWITCH2;
 284                 }
 285         }
 286
 287         switch (usage->hid) {
 288         case HID_GD_X:
 289                 features->x_max = field->logical_maximum;
 290                 if (finger) {
 291                         features->x_phy = field->physical_maximum;
 292                         if ((features->type != BAMBOO_PT) &&
 293                             (features->type != BAMBOO_TOUCH)) {
 294                                 features->unit = field->unit;
 295                                 features->unitExpo = field->unit_exponent;
 296                         }
 297                 }
 298                 break;
 299         case HID_GD_Y:
 300                 features->y_max = field->logical_maximum;
 301                 if (finger) {
 302                         features->y_phy = field->physical_maximum;
 303                         if ((features->type != BAMBOO_PT) &&
 304                             (features->type != BAMBOO_TOUCH)) {
 305                                 features->unit = field->unit;
 306                                 features->unitExpo = field->unit_exponent;
 307                         }
 308                 }
 309                 break;
 310         case HID_DG_TIPPRESSURE:
 311                 if (pen)
 312                         features->pressure_max = field->logical_maximum;
 313                 break;
 314         }
 315
 316         if (features->type == HID_GENERIC)
 317                 wacom_wac_usage_mapping(hdev, field, usage);
 318 }
 319
 320 static void wacom_post_parse_hid(struct hid_device *hdev,
 321                                  struct wacom_features *features)
 322 {
 323         struct wacom *wacom = hid_get_drvdata(hdev);
 324         struct wacom_wac *wacom_wac = &wacom->wacom_wac;
 325
 326         if (features->type == HID_GENERIC) {
 327                 /* Any last-minute generic device setup */
 328                 if (wacom_wac->has_mode_change) {
 329                         if (wacom_wac->is_direct_mode)
 330                                 features->device_type |= WACOM_DEVICETYPE_DIRECT;
 331                         else
 332                                 features->device_type &= ~WACOM_DEVICETYPE_DIRECT;
 333                 }
 334
 335                 if (features->touch_max > 1) {
 336                         if (features->device_type & WACOM_DEVICETYPE_DIRECT)
 337                                 input_mt_init_slots(wacom_wac->touch_input,
 338                                                     wacom_wac->features.touch_max,
 339                                                     INPUT_MT_DIRECT);
 340                         else
 341                                 input_mt_init_slots(wacom_wac->touch_input,
 342                                                     wacom_wac->features.touch_max,
 343                                                     INPUT_MT_POINTER);
 344                 }
 345         }
 346 }
 347
 348 static void wacom_parse_hid(struct hid_device *hdev,
 349                            struct wacom_features *features)
 350 {
 351         struct hid_report_enum *rep_enum;
 352         struct hid_report *hreport;
 353         int i, j;
 354
 355         /* check features first */
 356         rep_enum = &hdev->report_enum[HID_FEATURE_REPORT];
 357         list_for_each_entry(hreport, &rep_enum->report_list, list) {
 358                 for (i = 0; i < hreport->maxfield; i++) {
 359                         /* Ignore if report count is out of bounds. */
 360                         if (hreport->field[i]->report_count < 1)
 361                                 continue;
 362
 363                         for (j = 0; j < hreport->field[i]->maxusage; j++) {
 364                                 wacom_feature_mapping(hdev, hreport->field[i],
 365                                                 hreport->field[i]->usage + j);
 366                         }
 367                 }
 368         }
 369
 370         /* now check the input usages */
 371         rep_enum = &hdev->report_enum[HID_INPUT_REPORT];
 372         list_for_each_entry(hreport, &rep_enum->report_list, list) {
 373
 374                 if (!hreport->maxfield)
 375                         continue;
 376
 377                 for (i = 0; i < hreport->maxfield; i++)
 378                         for (j = 0; j < hreport->field[i]->maxusage; j++)
 379                                 wacom_usage_mapping(hdev, hreport->field[i],
 380                                                 hreport->field[i]->usage + j);
 381         }
 382
 383         wacom_post_parse_hid(hdev, features);
 384 }
 385
 386 static int wacom_hid_set_device_mode(struct hid_device *hdev)
 387 {
 388         struct wacom *wacom = hid_get_drvdata(hdev);
 389         struct hid_data *hid_data = &wacom->wacom_wac.hid_data;
 390         struct hid_report *r;
 391         struct hid_report_enum *re;
 392
 393         if (hid_data->inputmode < 0)
 394                 return 0;
 395
 396         re = &(hdev->report_enum[HID_FEATURE_REPORT]);
 397         r = re->report_id_hash[hid_data->inputmode];
 398         if (r) {
 399                 r->field[0]->value[hid_data->inputmode_index] = 2;
 400                 hid_hw_request(hdev, r, HID_REQ_SET_REPORT);
 401         }
 402         return 0;
 403 }
 404
 405 static int wacom_set_device_mode(struct hid_device *hdev,
 406                                  struct wacom_wac *wacom_wac)
 407 {
 408         u8 *rep_data;
 409         struct hid_report *r;
 410         struct hid_report_enum *re;
 411         int length;
 412         int error = -ENOMEM, limit = 0;
 413
 414         if (wacom_wac->mode_report < 0)
 415                 return 0;
 416
 417         re = &(hdev->report_enum[HID_FEATURE_REPORT]);
 418         r = re->report_id_hash[wacom_wac->mode_report];
 419         if (!r)
 420                 return -EINVAL;
 421
 422         rep_data = hid_alloc_report_buf(r, GFP_KERNEL);
 423         if (!rep_data)
 424                 return -ENOMEM;
 425
 426         length = hid_report_len(r);
 427
 428         do {
 429                 rep_data[0] = wacom_wac->mode_report;
 430                 rep_data[1] = wacom_wac->mode_value;
 431
 432                 error = wacom_set_report(hdev, HID_FEATURE_REPORT, rep_data,
 433                                          length, 1);
 434                 if (error >= 0)
 435                         error = wacom_get_report(hdev, HID_FEATURE_REPORT,
 436                                                  rep_data, length, 1);
 437         } while (error >= 0 &&
 438                  rep_data[1] != wacom_wac->mode_report &&
 439                  limit++ < WAC_MSG_RETRIES);
 440
 441         kfree(rep_data);
 442
 443         return error < 0 ? error : 0;
 444 }
 445
 446 static int wacom_bt_query_tablet_data(struct hid_device *hdev, u8 speed,
 447                 struct wacom_features *features)
 448 {
 449         struct wacom *wacom = hid_get_drvdata(hdev);
 450         int ret;
 451         u8 rep_data[2];
 452
 453         switch (features->type) {
 454         case GRAPHIRE_BT:
 455                 rep_data[0] = 0x03;
 456                 rep_data[1] = 0x00;
 457                 ret = wacom_set_report(hdev, HID_FEATURE_REPORT, rep_data, 2,
 458                                         3);
 459
 460                 if (ret >= 0) {
 461                         rep_data[0] = speed == 0 ? 0x05 : 0x06;
 462                         rep_data[1] = 0x00;
 463
 464                         ret = wacom_set_report(hdev, HID_FEATURE_REPORT,
 465                                                 rep_data, 2, 3);
 466
 467                         if (ret >= 0) {
 468                                 wacom->wacom_wac.bt_high_speed = speed;
 469                                 return 0;
 470                         }
 471                 }
 472
 473                 /*
 474                  * Note that if the raw queries fail, it's not a hard failure
 475                  * and it is safe to continue
 476                  */
 477                 hid_warn(hdev, "failed to poke device, command %d, err %d\n",
 478                          rep_data[0], ret);
 479                 break;
 480         case INTUOS4WL:
 481                 if (speed == 1)
 482                         wacom->wacom_wac.bt_features &= ~0x20;
 483                 else
 484                         wacom->wacom_wac.bt_features |= 0x20;
 485
 486                 rep_data[0] = 0x03;
 487                 rep_data[1] = wacom->wacom_wac.bt_features;
 488
 489                 ret = wacom_set_report(hdev, HID_FEATURE_REPORT, rep_data, 2,
 490                                         1);
 491                 if (ret >= 0)
 492                         wacom->wacom_wac.bt_high_speed = speed;
 493                 break;
 494         }
 495
 496         return 0;
 497 }
 498
 499 /*
 500  * Switch the tablet into its most-capable mode. Wacom tablets are
 501  * typically configured to power-up in a mode which sends mouse-like
 502  * reports to the OS. To get absolute position, pressure data, etc.
 503  * from the tablet, it is necessary to switch the tablet out of this
 504  * mode and into one which sends the full range of tablet data.
 505  */
 506 static int _wacom_query_tablet_data(struct wacom *wacom)
 507 {
 508         struct hid_device *hdev = wacom->hdev;
 509         struct wacom_wac *wacom_wac = &wacom->wacom_wac;
 510         struct wacom_features *features = &wacom_wac->features;
 511
 512         if (hdev->bus == BUS_BLUETOOTH)
 513                 return wacom_bt_query_tablet_data(hdev, 1, features);
 514
 515         if (features->type != HID_GENERIC) {
 516                 if (features->device_type & WACOM_DEVICETYPE_TOUCH) {
 517                         if (features->type > TABLETPC) {
 518                                 /* MT Tablet PC touch */
 519                                 wacom_wac->mode_report = 3;
 520                                 wacom_wac->mode_value = 4;
 521                         } else if (features->type == WACOM_24HDT) {
 522                                 wacom_wac->mode_report = 18;
 523                                 wacom_wac->mode_value = 2;
 524                         } else if (features->type == WACOM_27QHDT) {
 525                                 wacom_wac->mode_report = 131;
 526                                 wacom_wac->mode_value = 2;
 527                         } else if (features->type == BAMBOO_PAD) {
 528                                 wacom_wac->mode_report = 2;
 529                                 wacom_wac->mode_value = 2;
 530                         }
 531                 } else if (features->device_type & WACOM_DEVICETYPE_PEN) {
 532                         if (features->type <= BAMBOO_PT) {
 533                                 wacom_wac->mode_report = 2;
 534                                 wacom_wac->mode_value = 2;
 535                         }
 536                 }
 537         }
 538
 539         wacom_set_device_mode(hdev, wacom_wac);
 540
 541         if (features->type == HID_GENERIC)
 542                 return wacom_hid_set_device_mode(hdev);
 543
 544         return 0;
 545 }
 546
 547 static void wacom_retrieve_hid_descriptor(struct hid_device *hdev,
 548                                          struct wacom_features *features)
 549 {
 550         struct wacom *wacom = hid_get_drvdata(hdev);
 551         struct usb_interface *intf = wacom->intf;
 552
 553         /* default features */
 554         features->x_fuzz = 4;
 555         features->y_fuzz = 4;
 556         features->pressure_fuzz = 0;
 557         features->distance_fuzz = 1;
 558         features->tilt_fuzz = 1;
 559
 560         /*
 561          * The wireless device HID is basic and layout conflicts with
 562          * other tablets (monitor and touch interface can look like pen).
 563          * Skip the query for this type and modify defaults based on
 564          * interface number.
 565          */
 566         if (features->type == WIRELESS) {
 567                 if (intf->cur_altsetting->desc.bInterfaceNumber == 0)
 568                         features->device_type = WACOM_DEVICETYPE_WL_MONITOR;
 569                 else
 570                         features->device_type = WACOM_DEVICETYPE_NONE;
 571                 return;
 572         }
 573
 574         wacom_parse_hid(hdev, features);
 575 }
 576
 577 struct wacom_hdev_data {
 578         struct list_head list;
 579         struct kref kref;
 580         struct hid_device *dev;
 581         struct wacom_shared shared;
 582 };
 583
 584 static LIST_HEAD(wacom_udev_list);
 585 static DEFINE_MUTEX(wacom_udev_list_lock);
 586
 587 static bool compare_device_paths(struct hid_device *hdev_a,
 588                 struct hid_device *hdev_b, char separator)
 589 {
 590         int n1 = strrchr(hdev_a->phys, separator) - hdev_a->phys;
 591         int n2 = strrchr(hdev_b->phys, separator) - hdev_b->phys;
 592
 593         if (n1 != n2 || n1 <= 0 || n2 <= 0)
 594                 return false;
 595
 596         return !strncmp(hdev_a->phys, hdev_b->phys, n1);
 597 }
 598
 599 static bool wacom_are_sibling(struct hid_device *hdev,
 600                 struct hid_device *sibling)
 601 {
 602         struct wacom *wacom = hid_get_drvdata(hdev);
 603         struct wacom_features *features = &wacom->wacom_wac.features;
 604         struct wacom *sibling_wacom = hid_get_drvdata(sibling);
 605         struct wacom_features *sibling_features = &sibling_wacom->wacom_wac.features;
 606         __u32 oVid = features->oVid ? features->oVid : hdev->vendor;
 607         __u32 oPid = features->oPid ? features->oPid : hdev->product;
 608
 609         /* The defined oVid/oPid must match that of the sibling */
 610         if (features->oVid != HID_ANY_ID && sibling->vendor != oVid)
 611                 return false;
 612         if (features->oPid != HID_ANY_ID && sibling->product != oPid)
 613                 return false;
 614
 615         /*
 616          * Devices with the same VID/PID must share the same physical
 617          * device path, while those with different VID/PID must share
 618          * the same physical parent device path.
 619          */
 620         if (hdev->vendor == sibling->vendor && hdev->product == sibling->product) {
 621                 if (!compare_device_paths(hdev, sibling, '/'))
 622                         return false;
 623         } else {
 624                 if (!compare_device_paths(hdev, sibling, '.'))
 625                         return false;
 626         }
 627
 628         /* Skip the remaining heuristics unless you are a HID_GENERIC device */
 629         if (features->type != HID_GENERIC)
 630                 return true;
 631
 632         /*
 633          * Direct-input devices may not be siblings of indirect-input
 634          * devices.
 635          */
 636         if ((features->device_type & WACOM_DEVICETYPE_DIRECT) &&
 637             !(sibling_features->device_type & WACOM_DEVICETYPE_DIRECT))
 638                 return false;
 639
 640         /*
 641          * Indirect-input devices may not be siblings of direct-input
 642          * devices.
 643          */
 644         if (!(features->device_type & WACOM_DEVICETYPE_DIRECT) &&
 645             (sibling_features->device_type & WACOM_DEVICETYPE_DIRECT))
 646                 return false;
 647
 648         /* Pen devices may only be siblings of touch devices */
 649         if ((features->device_type & WACOM_DEVICETYPE_PEN) &&
 650             !(sibling_features->device_type & WACOM_DEVICETYPE_TOUCH))
 651                 return false;
 652
 653         /* Touch devices may only be siblings of pen devices */
 654         if ((features->device_type & WACOM_DEVICETYPE_TOUCH) &&
 655             !(sibling_features->device_type & WACOM_DEVICETYPE_PEN))
 656                 return false;
 657
 658         /*
 659          * No reason could be found for these two devices to NOT be
 660          * siblings, so there's a good chance they ARE siblings
 661          */
 662         return true;
 663 }
 664
 665 static struct wacom_hdev_data *wacom_get_hdev_data(struct hid_device *hdev)
 666 {
 667         struct wacom_hdev_data *data;
 668
 669         /* Try to find an already-probed interface from the same device */
 670         list_for_each_entry(data, &wacom_udev_list, list) {
 671                 if (compare_device_paths(hdev, data->dev, '/')) {
 672                         kref_get(&data->kref);
 673                         return data;
 674                 }
 675         }
 676
 677         /* Fallback to finding devices that appear to be "siblings" */
 678         list_for_each_entry(data, &wacom_udev_list, list) {
 679                 if (wacom_are_sibling(hdev, data->dev)) {
 680                         kref_get(&data->kref);
 681                         return data;
 682                 }
 683         }
 684
 685         return NULL;
 686 }
 687
 688 static void wacom_release_shared_data(struct kref *kref)
 689 {
 690         struct wacom_hdev_data *data =
 691                 container_of(kref, struct wacom_hdev_data, kref);
 692
 693         mutex_lock(&wacom_udev_list_lock);
 694         list_del(&data->list);
 695         mutex_unlock(&wacom_udev_list_lock);
 696
 697         kfree(data);
 698 }
 699
 700 static void wacom_remove_shared_data(void *res)
 701 {
 702         struct wacom *wacom = res;
 703         struct wacom_hdev_data *data;
 704         struct wacom_wac *wacom_wac = &wacom->wacom_wac;
 705
 706         if (wacom_wac->shared) {
 707                 data = container_of(wacom_wac->shared, struct wacom_hdev_data,
 708                                     shared);
 709
 710                 if (wacom_wac->shared->touch == wacom->hdev)
 711                         wacom_wac->shared->touch = NULL;
 712                 else if (wacom_wac->shared->pen == wacom->hdev)
 713                         wacom_wac->shared->pen = NULL;
 714
 715                 kref_put(&data->kref, wacom_release_shared_data);
 716                 wacom_wac->shared = NULL;
 717         }
 718 }
 719
 720 static int wacom_add_shared_data(struct hid_device *hdev)
 721 {
 722         struct wacom *wacom = hid_get_drvdata(hdev);
 723         struct wacom_wac *wacom_wac = &wacom->wacom_wac;
 724         struct wacom_hdev_data *data;
 725         int retval = 0;
 726
 727         mutex_lock(&wacom_udev_list_lock);
 728
 729         data = wacom_get_hdev_data(hdev);
 730         if (!data) {
 731                 data = kzalloc(sizeof(struct wacom_hdev_data), GFP_KERNEL);
 732                 if (!data) {
 733                         retval = -ENOMEM;
 734                         goto out;
 735                 }
 736
 737                 kref_init(&data->kref);
 738                 data->dev = hdev;
 739                 list_add_tail(&data->list, &wacom_udev_list);
 740         }
 741
 742         wacom_wac->shared = &data->shared;
 743
 744         retval = devm_add_action(&hdev->dev, wacom_remove_shared_data, wacom);
 745         if (retval) {
 746                 mutex_unlock(&wacom_udev_list_lock);
 747                 wacom_remove_shared_data(wacom);
 748                 return retval;
 749         }
 750
 751         if (wacom_wac->features.device_type & WACOM_DEVICETYPE_TOUCH)
 752                 wacom_wac->shared->touch = hdev;
 753         else if (wacom_wac->features.device_type & WACOM_DEVICETYPE_PEN)
 754                 wacom_wac->shared->pen = hdev;
 755
 756 out:
 757         mutex_unlock(&wacom_udev_list_lock);
 758         return retval;
 759 }
 760
 761 static int wacom_led_control(struct wacom *wacom)
 762 {
 763         unsigned char *buf;
 764         int retval;
 765         unsigned char report_id = WAC_CMD_LED_CONTROL;
 766         int buf_size = 9;
 767
 768         if (!wacom->led.groups)
 769                 return -ENOTSUPP;
 770
 771         if (wacom->wacom_wac.features.type == REMOTE)
 772                 return -ENOTSUPP;
 773
 774         if (wacom->wacom_wac.pid) { /* wireless connected */
 775                 report_id = WAC_CMD_WL_LED_CONTROL;
 776                 buf_size = 13;
 777         }
 778         else if (wacom->wacom_wac.features.type == INTUOSP2_BT) {
 779                 report_id = WAC_CMD_WL_INTUOSP2;
 780                 buf_size = 51;
 781         }
 782         buf = kzalloc(buf_size, GFP_KERNEL);
 783         if (!buf)
 784                 return -ENOMEM;
 785
 786         if (wacom->wacom_wac.features.type == HID_GENERIC) {
 787                 buf[0] = WAC_CMD_LED_CONTROL_GENERIC;
 788                 buf[1] = wacom->led.llv;
 789                 buf[2] = wacom->led.groups[0].select & 0x03;
 790
 791         } else if ((wacom->wacom_wac.features.type >= INTUOS5S &&
 792             wacom->wacom_wac.features.type <= INTUOSPL)) {
 793                 /*
 794                  * Touch Ring and crop mark LED luminance may take on
 795                  * one of four values:
 796                  *    0 = Low; 1 = Medium; 2 = High; 3 = Off
 797                  */
 798                 int ring_led = wacom->led.groups[0].select & 0x03;
 799                 int ring_lum = (((wacom->led.llv & 0x60) >> 5) - 1) & 0x03;
 800                 int crop_lum = 0;
 801                 unsigned char led_bits = (crop_lum << 4) | (ring_lum << 2) | (ring_led);
 802
 803                 buf[0] = report_id;
 804                 if (wacom->wacom_wac.pid) {
 805                         wacom_get_report(wacom->hdev, HID_FEATURE_REPORT,
 806                                          buf, buf_size, WAC_CMD_RETRIES);
 807                         buf[0] = report_id;
 808                         buf[4] = led_bits;
 809                 } else
 810                         buf[1] = led_bits;
 811         }
 812         else if (wacom->wacom_wac.features.type == INTUOSP2_BT) {
 813                 buf[0] = report_id;
 814                 buf[4] = 100; // Power Connection LED (ORANGE)
 815                 buf[5] = 100; // BT Connection LED (BLUE)
 816                 buf[6] = 100; // Paper Mode (RED?)
 817                 buf[7] = 100; // Paper Mode (GREEN?)
 818                 buf[8] = 100; // Paper Mode (BLUE?)
 819                 buf[9] = wacom->led.llv;
 820                 buf[10] = wacom->led.groups[0].select & 0x03;
 821         }
 822         else {
 823                 int led = wacom->led.groups[0].select | 0x4;
 824
 825                 if (wacom->wacom_wac.features.type == WACOM_21UX2 ||
 826                     wacom->wacom_wac.features.type == WACOM_24HD)
 827                         led |= (wacom->led.groups[1].select << 4) | 0x40;
 828
 829                 buf[0] = report_id;
 830                 buf[1] = led;
 831                 buf[2] = wacom->led.llv;
 832                 buf[3] = wacom->led.hlv;
 833                 buf[4] = wacom->led.img_lum;
 834         }
 835
 836         retval = wacom_set_report(wacom->hdev, HID_FEATURE_REPORT, buf, buf_size,
 837                                   WAC_CMD_RETRIES);
 838         kfree(buf);
 839
 840         return retval;
 841 }
 842
 843 static int wacom_led_putimage(struct wacom *wacom, int button_id, u8 xfer_id,
 844                 const unsigned len, const void *img)
 845 {
 846         unsigned char *buf;
 847         int i, retval;
 848         const unsigned chunk_len = len / 4; /* 4 chunks are needed to be sent */
 849
 850         buf = kzalloc(chunk_len + 3 , GFP_KERNEL);
 851         if (!buf)
 852                 return -ENOMEM;
 853
 854         /* Send 'start' command */
 855         buf[0] = WAC_CMD_ICON_START;
 856         buf[1] = 1;
 857         retval = wacom_set_report(wacom->hdev, HID_FEATURE_REPORT, buf, 2,
 858                                   WAC_CMD_RETRIES);
 859         if (retval < 0)
 860                 goto out;
 861
 862         buf[0] = xfer_id;
 863         buf[1] = button_id & 0x07;
 864         for (i = 0; i < 4; i++) {
 865                 buf[2] = i;
 866                 memcpy(buf + 3, img + i * chunk_len, chunk_len);
 867
 868                 retval = wacom_set_report(wacom->hdev, HID_FEATURE_REPORT,
 869                                           buf, chunk_len + 3, WAC_CMD_RETRIES);
 870                 if (retval < 0)
 871                         break;
 872         }
 873
 874         /* Send 'stop' */
 875         buf[0] = WAC_CMD_ICON_START;
 876         buf[1] = 0;
 877         wacom_set_report(wacom->hdev, HID_FEATURE_REPORT, buf, 2,
 878                          WAC_CMD_RETRIES);
 879
 880 out:
 881         kfree(buf);
 882         return retval;
 883 }
 884
 885 static ssize_t wacom_led_select_store(struct device *dev, int set_id,
 886                                       const char *buf, size_t count)
 887 {
 888         struct hid_device *hdev = to_hid_device(dev);
 889         struct wacom *wacom = hid_get_drvdata(hdev);
 890         unsigned int id;
 891         int err;
 892
 893         err = kstrtouint(buf, 10, &id);
 894         if (err)
 895                 return err;
 896
 897         mutex_lock(&wacom->lock);
 898
 899         wacom->led.groups[set_id].select = id & 0x3;
 900         err = wacom_led_control(wacom);
 901
 902         mutex_unlock(&wacom->lock);
 903
 904         return err < 0 ? err : count;
 905 }
 906
 907 #define DEVICE_LED_SELECT_ATTR(SET_ID)                                  \
 908 static ssize_t wacom_led##SET_ID##_select_store(struct device *dev,     \
 909         struct device_attribute *attr, const char *buf, size_t count)   \
 910 {                                                                       \
 911         return wacom_led_select_store(dev, SET_ID, buf, count);         \
 912 }                                                                       \
 913 static ssize_t wacom_led##SET_ID##_select_show(struct device *dev,      \
 914         struct device_attribute *attr, char *buf)                       \
 915 {                                                                       \
 916         struct hid_device *hdev = to_hid_device(dev);\
 917         struct wacom *wacom = hid_get_drvdata(hdev);                    \
 918         return scnprintf(buf, PAGE_SIZE, "%d\n",                        \
 919                          wacom->led.groups[SET_ID].select);             \
 920 }                                                                       \
 921 static DEVICE_ATTR(status_led##SET_ID##_select, DEV_ATTR_RW_PERM,       \
 922                     wacom_led##SET_ID##_select_show,                    \
 923                     wacom_led##SET_ID##_select_store)
 924
 925 DEVICE_LED_SELECT_ATTR(0);
 926 DEVICE_LED_SELECT_ATTR(1);
 927
 928 static ssize_t wacom_luminance_store(struct wacom *wacom, u8 *dest,
 929                                      const char *buf, size_t count)
 930 {
 931         unsigned int value;
 932         int err;
 933
 934         err = kstrtouint(buf, 10, &value);
 935         if (err)
 936                 return err;
 937
 938         mutex_lock(&wacom->lock);
 939
 940         *dest = value & 0x7f;
 941         err = wacom_led_control(wacom);
 942
 943         mutex_unlock(&wacom->lock);
 944
 945         return err < 0 ? err : count;
 946 }
 947
 948 #define DEVICE_LUMINANCE_ATTR(name, field)                              \
 949 static ssize_t wacom_##name##_luminance_store(struct device *dev,       \
 950         struct device_attribute *attr, const char *buf, size_t count)   \
 951 {                                                                       \
 952         struct hid_device *hdev = to_hid_device(dev);\
 953         struct wacom *wacom = hid_get_drvdata(hdev);                    \
 954                                                                         \
 955         return wacom_luminance_store(wacom, &wacom->led.field,          \
 956                                      buf, count);                       \
 957 }                                                                       \
 958 static ssize_t wacom_##name##_luminance_show(struct device *dev,        \
 959         struct device_attribute *attr, char *buf)                       \
 960 {                                                                       \
 961         struct wacom *wacom = dev_get_drvdata(dev);                     \
 962         return scnprintf(buf, PAGE_SIZE, "%d\n", wacom->led.field);     \
 963 }                                                                       \
 964 static DEVICE_ATTR(name##_luminance, DEV_ATTR_RW_PERM,                  \
 965                    wacom_##name##_luminance_show,                       \
 966                    wacom_##name##_luminance_store)
 967
 968 DEVICE_LUMINANCE_ATTR(status0, llv);
 969 DEVICE_LUMINANCE_ATTR(status1, hlv);
 970 DEVICE_LUMINANCE_ATTR(buttons, img_lum);
 971
 972 static ssize_t wacom_button_image_store(struct device *dev, int button_id,
 973                                         const char *buf, size_t count)
 974 {
 975         struct hid_device *hdev = to_hid_device(dev);
 976         struct wacom *wacom = hid_get_drvdata(hdev);
 977         int err;
 978         unsigned len;
 979         u8 xfer_id;
 980
 981         if (hdev->bus == BUS_BLUETOOTH) {
 982                 len = 256;
 983                 xfer_id = WAC_CMD_ICON_BT_XFER;
 984         } else {
 985                 len = 1024;
 986                 xfer_id = WAC_CMD_ICON_XFER;
 987         }
 988
 989         if (count != len)
 990                 return -EINVAL;
 991
 992         mutex_lock(&wacom->lock);
 993
 994         err = wacom_led_putimage(wacom, button_id, xfer_id, len, buf);
 995
 996         mutex_unlock(&wacom->lock);
 997
 998         return err < 0 ? err : count;
 999 }
1000
1001 #define DEVICE_BTNIMG_ATTR(BUTTON_ID)                                   \
1002 static ssize_t wacom_btnimg##BUTTON_ID##_store(struct device *dev,      \
1003         struct device_attribute *attr, const char *buf, size_t count)   \
1004 {                                                                       \
1005         return wacom_button_image_store(dev, BUTTON_ID, buf, count);    \
1006 }                                                                       \
1007 static DEVICE_ATTR(button##BUTTON_ID##_rawimg, DEV_ATTR_WO_PERM,        \
1008                    NULL, wacom_btnimg##BUTTON_ID##_store)
1009
1010 DEVICE_BTNIMG_ATTR(0);
1011 DEVICE_BTNIMG_ATTR(1);
1012 DEVICE_BTNIMG_ATTR(2);
1013 DEVICE_BTNIMG_ATTR(3);
1014 DEVICE_BTNIMG_ATTR(4);
1015 DEVICE_BTNIMG_ATTR(5);
1016 DEVICE_BTNIMG_ATTR(6);
1017 DEVICE_BTNIMG_ATTR(7);
1018
1019 static struct attribute *cintiq_led_attrs[] = {
1020         &dev_attr_status_led0_select.attr,
1021         &dev_attr_status_led1_select.attr,
1022         NULL
1023 };
1024
1025 static struct attribute_group cintiq_led_attr_group = {
1026         .name = "wacom_led",
1027         .attrs = cintiq_led_attrs,
1028 };
1029
1030 static struct attribute *intuos4_led_attrs[] = {
1031         &dev_attr_status0_luminance.attr,
1032         &dev_attr_status1_luminance.attr,
1033         &dev_attr_status_led0_select.attr,
1034         &dev_attr_buttons_luminance.attr,
1035         &dev_attr_button0_rawimg.attr,
1036         &dev_attr_button1_rawimg.attr,
1037         &dev_attr_button2_rawimg.attr,
1038         &dev_attr_button3_rawimg.attr,
1039         &dev_attr_button4_rawimg.attr,
1040         &dev_attr_button5_rawimg.attr,
1041         &dev_attr_button6_rawimg.attr,
1042         &dev_attr_button7_rawimg.attr,
1043         NULL
1044 };
1045
1046 static struct attribute_group intuos4_led_attr_group = {
1047         .name = "wacom_led",
1048         .attrs = intuos4_led_attrs,
1049 };
1050
1051 static struct attribute *intuos5_led_attrs[] = {
1052         &dev_attr_status0_luminance.attr,
1053         &dev_attr_status_led0_select.attr,
1054         NULL
1055 };
1056
1057 static struct attribute_group intuos5_led_attr_group = {
1058         .name = "wacom_led",
1059         .attrs = intuos5_led_attrs,
1060 };
1061
1062 static struct attribute *generic_led_attrs[] = {
1063         &dev_attr_status0_luminance.attr,
1064         &dev_attr_status_led0_select.attr,
1065         NULL
1066 };
1067
1068 static struct attribute_group generic_led_attr_group = {
1069         .name = "wacom_led",
1070         .attrs = generic_led_attrs,
1071 };
1072
1073 struct wacom_sysfs_group_devres {
1074         struct attribute_group *group;
1075         struct kobject *root;
1076 };
1077
1078 static void wacom_devm_sysfs_group_release(struct device *dev, void *res)
1079 {
1080         struct wacom_sysfs_group_devres *devres = res;
1081         struct kobject *kobj = devres->root;
1082
1083         dev_dbg(dev, "%s: dropping reference to %s\n",
1084                 __func__, devres->group->name);
1085         sysfs_remove_group(kobj, devres->group);
1086 }
1087
1088 static int __wacom_devm_sysfs_create_group(struct wacom *wacom,
1089                                            struct kobject *root,
1090                                            struct attribute_group *group)
1091 {
1092         struct wacom_sysfs_group_devres *devres;
1093         int error;
1094
1095         devres = devres_alloc(wacom_devm_sysfs_group_release,
1096                               sizeof(struct wacom_sysfs_group_devres),
1097                               GFP_KERNEL);
1098         if (!devres)
1099                 return -ENOMEM;
1100
1101         devres->group = group;
1102         devres->root = root;
1103
1104         error = sysfs_create_group(devres->root, group);
1105         if (error)
1106                 return error;
1107
1108         devres_add(&wacom->hdev->dev, devres);
1109
1110         return 0;
1111 }
1112
1113 static int wacom_devm_sysfs_create_group(struct wacom *wacom,
1114                                          struct attribute_group *group)
1115 {
1116         return __wacom_devm_sysfs_create_group(wacom, &wacom->hdev->dev.kobj,
1117                                                group);
1118 }
1119
1120 enum led_brightness wacom_leds_brightness_get(struct wacom_led *led)
1121 {
1122         struct wacom *wacom = led->wacom;
1123
1124         if (wacom->led.max_hlv)
1125                 return led->hlv * LED_FULL / wacom->led.max_hlv;
1126
1127         if (wacom->led.max_llv)
1128                 return led->llv * LED_FULL / wacom->led.max_llv;
1129
1130         /* device doesn't support brightness tuning */
1131         return LED_FULL;
1132 }
1133
1134 static enum led_brightness __wacom_led_brightness_get(struct led_classdev *cdev)
1135 {
1136         struct wacom_led *led = container_of(cdev, struct wacom_led, cdev);
1137         struct wacom *wacom = led->wacom;
1138
1139         if (wacom->led.groups[led->group].select != led->id)
1140                 return LED_OFF;
1141
1142         return wacom_leds_brightness_get(led);
1143 }
1144
1145 static int wacom_led_brightness_set(struct led_classdev *cdev,
1146                                     enum led_brightness brightness)
1147 {
1148         struct wacom_led *led = container_of(cdev, struct wacom_led, cdev);
1149         struct wacom *wacom = led->wacom;
1150         int error;
1151
1152         mutex_lock(&wacom->lock);
1153
1154         if (!wacom->led.groups || (brightness == LED_OFF &&
1155             wacom->led.groups[led->group].select != led->id)) {
1156                 error = 0;
1157                 goto out;
1158         }
1159
1160         led->llv = wacom->led.llv = wacom->led.max_llv * brightness / LED_FULL;
1161         led->hlv = wacom->led.hlv = wacom->led.max_hlv * brightness / LED_FULL;
1162
1163         wacom->led.groups[led->group].select = led->id;
1164
1165         error = wacom_led_control(wacom);
1166
1167 out:
1168         mutex_unlock(&wacom->lock);
1169
1170         return error;
1171 }
1172
1173 static void wacom_led_readonly_brightness_set(struct led_classdev *cdev,
1174                                                enum led_brightness brightness)
1175 {
1176 }
1177
1178 static int wacom_led_register_one(struct device *dev, struct wacom *wacom,
1179                                   struct wacom_led *led, unsigned int group,
1180                                   unsigned int id, bool read_only)
1181 {
1182         int error;
1183         char *name;
1184
1185         name = devm_kasprintf(dev, GFP_KERNEL,
1186                               "%s::wacom-%d.%d",
1187                               dev_name(dev),
1188                               group,
1189                               id);
1190         if (!name)
1191                 return -ENOMEM;
1192
1193         if (!read_only) {
1194                 led->trigger.name = name;
1195                 error = devm_led_trigger_register(dev, &led->trigger);
1196                 if (error) {
1197                         hid_err(wacom->hdev,
1198                                 "failed to register LED trigger %s: %d\n",
1199                                 led->cdev.name, error);
1200                         return error;
1201                 }
1202         }
1203
1204         led->group = group;
1205         led->id = id;
1206         led->wacom = wacom;
1207         led->llv = wacom->led.llv;
1208         led->hlv = wacom->led.hlv;
1209         led->cdev.name = name;
1210         led->cdev.max_brightness = LED_FULL;
1211         led->cdev.flags = LED_HW_PLUGGABLE;
1212         led->cdev.brightness_get = __wacom_led_brightness_get;
1213         if (!read_only) {
1214                 led->cdev.brightness_set_blocking = wacom_led_brightness_set;
1215                 led->cdev.default_trigger = led->cdev.name;
1216         } else {
1217                 led->cdev.brightness_set = wacom_led_readonly_brightness_set;
1218         }
1219
1220         error = devm_led_classdev_register(dev, &led->cdev);
1221         if (error) {
1222                 hid_err(wacom->hdev,
1223                         "failed to register LED %s: %d\n",
1224                         led->cdev.name, error);
1225                 led->cdev.name = NULL;
1226                 return error;
1227         }
1228
1229         return 0;
1230 }
1231
1232 static void wacom_led_groups_release_one(void *data)
1233 {
1234         struct wacom_group_leds *group = data;
1235
1236         devres_release_group(group->dev, group);
1237 }
1238
1239 static int wacom_led_groups_alloc_and_register_one(struct device *dev,
1240                                                    struct wacom *wacom,
1241                                                    int group_id, int count,
1242                                                    bool read_only)
1243 {
1244         struct wacom_led *leds;
1245         int i, error;
1246
1247         if (group_id >= wacom->led.count || count <= 0)
1248                 return -EINVAL;
1249
1250         if (!devres_open_group(dev, &wacom->led.groups[group_id], GFP_KERNEL))
1251                 return -ENOMEM;
1252
1253         leds = devm_kzalloc(dev, sizeof(struct wacom_led) * count, GFP_KERNEL);
1254         if (!leds) {
1255                 error = -ENOMEM;
1256                 goto err;
1257         }
1258
1259         wacom->led.groups[group_id].leds = leds;
1260         wacom->led.groups[group_id].count = count;
1261
1262         for (i = 0; i < count; i++) {
1263                 error = wacom_led_register_one(dev, wacom, &leds[i],
1264                                                group_id, i, read_only);
1265                 if (error)
1266                         goto err;
1267         }
1268
1269         wacom->led.groups[group_id].dev = dev;
1270
1271         devres_close_group(dev, &wacom->led.groups[group_id]);
1272
1273         /*
1274          * There is a bug (?) in devm_led_classdev_register() in which its
1275          * increments the refcount of the parent. If the parent is an input
1276          * device, that means the ref count never reaches 0 when
1277          * devm_input_device_release() gets called.
1278          * This means that the LEDs are still there after disconnect.
1279          * Manually force the release of the group so that the leds are released
1280          * once we are done using them.
1281          */
1282         error = devm_add_action_or_reset(&wacom->hdev->dev,
1283                                          wacom_led_groups_release_one,
1284                                          &wacom->led.groups[group_id]);
1285         if (error)
1286                 return error;
1287
1288         return 0;
1289
1290 err:
1291         devres_release_group(dev, &wacom->led.groups[group_id]);
1292         return error;
1293 }
1294
1295 struct wacom_led *wacom_led_find(struct wacom *wacom, unsigned int group_id,
1296                                  unsigned int id)
1297 {
1298         struct wacom_group_leds *group;
1299
1300         if (group_id >= wacom->led.count)
1301                 return NULL;
1302
1303         group = &wacom->led.groups[group_id];
1304
1305         if (!group->leds)
1306                 return NULL;
1307
1308         id %= group->count;
1309
1310         return &group->leds[id];
1311 }
1312
1313 /**
1314  * wacom_led_next: gives the next available led with a wacom trigger.
1315  *
1316  * returns the next available struct wacom_led which has its default trigger
1317  * or the current one if none is available.
1318  */
1319 struct wacom_led *wacom_led_next(struct wacom *wacom, struct wacom_led *cur)
1320 {
1321         struct wacom_led *next_led;
1322         int group, next;
1323
1324         if (!wacom || !cur)
1325                 return NULL;
1326
1327         group = cur->group;
1328         next = cur->id;
1329
1330         do {
1331                 next_led = wacom_led_find(wacom, group, ++next);
1332                 if (!next_led || next_led == cur)
1333                         return next_led;
1334         } while (next_led->cdev.trigger != &next_led->trigger);
1335
1336         return next_led;
1337 }
1338
1339 static void wacom_led_groups_release(void *data)
1340 {
1341         struct wacom *wacom = data;
1342
1343         wacom->led.groups = NULL;
1344         wacom->led.count = 0;
1345 }
1346
1347 static int wacom_led_groups_allocate(struct wacom *wacom, int count)
1348 {
1349         struct device *dev = &wacom->hdev->dev;
1350         struct wacom_group_leds *groups;
1351         int error;
1352
1353         groups = devm_kzalloc(dev, sizeof(struct wacom_group_leds) * count,
1354                               GFP_KERNEL);
1355         if (!groups)
1356                 return -ENOMEM;
1357
1358         error = devm_add_action_or_reset(dev, wacom_led_groups_release, wacom);
1359         if (error)
1360                 return error;
1361
1362         wacom->led.groups = groups;
1363         wacom->led.count = count;
1364
1365         return 0;
1366 }
1367
1368 static int wacom_leds_alloc_and_register(struct wacom *wacom, int group_count,
1369                                          int led_per_group, bool read_only)
1370 {
1371         struct device *dev;
1372         int i, error;
1373
1374         if (!wacom->wacom_wac.pad_input)
1375                 return -EINVAL;
1376
1377         dev = &wacom->wacom_wac.pad_input->dev;
1378
1379         error = wacom_led_groups_allocate(wacom, group_count);
1380         if (error)
1381                 return error;
1382
1383         for (i = 0; i < group_count; i++) {
1384                 error = wacom_led_groups_alloc_and_register_one(dev, wacom, i,
1385                                                                 led_per_group,
1386                                                                 read_only);
1387                 if (error)
1388                         return error;
1389         }
1390
1391         return 0;
1392 }
1393
1394 int wacom_initialize_leds(struct wacom *wacom)
1395 {
1396         int error;
1397
1398         if (!(wacom->wacom_wac.features.device_type & WACOM_DEVICETYPE_PAD))
1399                 return 0;
1400
1401         /* Initialize default values */
1402         switch (wacom->wacom_wac.features.type) {
1403         case HID_GENERIC:
1404                 if (!wacom->generic_has_leds)
1405                         return 0;
1406                 wacom->led.llv = 100;
1407                 wacom->led.max_llv = 100;
1408
1409                 error = wacom_leds_alloc_and_register(wacom, 1, 4, false);
1410                 if (error) {
1411                         hid_err(wacom->hdev,
1412                                 "cannot create leds err: %d\n", error);
1413                         return error;
1414                 }
1415
1416                 error = wacom_devm_sysfs_create_group(wacom,
1417                                                       &generic_led_attr_group);
1418                 break;
1419
1420         case INTUOS4S:
1421         case INTUOS4:
1422         case INTUOS4WL:
1423         case INTUOS4L:
1424                 wacom->led.llv = 10;
1425                 wacom->led.hlv = 20;
1426                 wacom->led.max_llv = 127;
1427                 wacom->led.max_hlv = 127;
1428                 wacom->led.img_lum = 10;
1429
1430                 error = wacom_leds_alloc_and_register(wacom, 1, 4, false);
1431                 if (error) {
1432                         hid_err(wacom->hdev,
1433                                 "cannot create leds err: %d\n", error);
1434                         return error;
1435                 }
1436
1437                 error = wacom_devm_sysfs_create_group(wacom,
1438                                                       &intuos4_led_attr_group);
1439                 break;
1440
1441         case WACOM_24HD:
1442         case WACOM_21UX2:
1443                 wacom->led.llv = 0;
1444                 wacom->led.hlv = 0;
1445                 wacom->led.img_lum = 0;
1446
1447                 error = wacom_leds_alloc_and_register(wacom, 2, 4, false);
1448                 if (error) {
1449                         hid_err(wacom->hdev,
1450                                 "cannot create leds err: %d\n", error);
1451                         return error;
1452                 }
1453
1454                 error = wacom_devm_sysfs_create_group(wacom,
1455                                                       &cintiq_led_attr_group);
1456                 break;
1457
1458         case INTUOS5S:
1459         case INTUOS5:
1460         case INTUOS5L:
1461         case INTUOSPS:
1462         case INTUOSPM:
1463         case INTUOSPL:
1464                 wacom->led.llv = 32;
1465                 wacom->led.max_llv = 96;
1466
1467                 error = wacom_leds_alloc_and_register(wacom, 1, 4, false);
1468                 if (error) {
1469                         hid_err(wacom->hdev,
1470                                 "cannot create leds err: %d\n", error);
1471                         return error;
1472                 }
1473
1474                 error = wacom_devm_sysfs_create_group(wacom,
1475                                                       &intuos5_led_attr_group);
1476                 break;
1477
1478         case INTUOSP2_BT:
1479                 wacom->led.llv = 50;
1480                 wacom->led.max_llv = 100;
1481                 error = wacom_leds_alloc_and_register(wacom, 1, 4, false);
1482                 if (error) {
1483                         hid_err(wacom->hdev,
1484                                 "cannot create leds err: %d\n", error);
1485                         return error;
1486                 }
1487                 return 0;
1488
1489         case REMOTE:
1490                 wacom->led.llv = 255;
1491                 wacom->led.max_llv = 255;
1492                 error = wacom_led_groups_allocate(wacom, 5);
1493                 if (error) {
1494                         hid_err(wacom->hdev,
1495                                 "cannot create leds err: %d\n", error);
1496                         return error;
1497                 }
1498                 return 0;
1499
1500         default:
1501                 return 0;
1502         }
1503
1504         if (error) {
1505                 hid_err(wacom->hdev,
1506                         "cannot create sysfs group err: %d\n", error);
1507                 return error;
1508         }
1509
1510         return 0;
1511 }
1512
1513 static void wacom_init_work(struct work_struct *work)
1514 {
1515         struct wacom *wacom = container_of(work, struct wacom, init_work.work);
1516
1517         _wacom_query_tablet_data(wacom);
1518         wacom_led_control(wacom);
1519 }
1520
1521 static void wacom_query_tablet_data(struct wacom *wacom)
1522 {
1523         schedule_delayed_work(&wacom->init_work, msecs_to_jiffies(1000));
1524 }
1525
1526 static enum power_supply_property wacom_battery_props[] = {
1527         POWER_SUPPLY_PROP_MODEL_NAME,
1528         POWER_SUPPLY_PROP_PRESENT,
1529         POWER_SUPPLY_PROP_STATUS,
1530         POWER_SUPPLY_PROP_SCOPE,
1531         POWER_SUPPLY_PROP_CAPACITY
1532 };
1533
1534 static int wacom_battery_get_property(struct power_supply *psy,
1535                                       enum power_supply_property psp,
1536                                       union power_supply_propval *val)
1537 {
1538         struct wacom_battery *battery = power_supply_get_drvdata(psy);
1539         int ret = 0;
1540
1541         switch (psp) {
1542                 case POWER_SUPPLY_PROP_MODEL_NAME:
1543                         val->strval = battery->wacom->wacom_wac.name;
1544                         break;
1545                 case POWER_SUPPLY_PROP_PRESENT:
1546                         val->intval = battery->bat_connected;
1547                         break;
1548                 case POWER_SUPPLY_PROP_SCOPE:
1549                         val->intval = POWER_SUPPLY_SCOPE_DEVICE;
1550                         break;
1551                 case POWER_SUPPLY_PROP_CAPACITY:
1552                         val->intval = battery->battery_capacity;
1553                         break;
1554                 case POWER_SUPPLY_PROP_STATUS:
1555                         if (battery->bat_status != WACOM_POWER_SUPPLY_STATUS_AUTO)
1556                                 val->intval = battery->bat_status;
1557                         else if (battery->bat_charging)
1558                                 val->intval = POWER_SUPPLY_STATUS_CHARGING;
1559                         else if (battery->battery_capacity == 100 &&
1560                                     battery->ps_connected)
1561                                 val->intval = POWER_SUPPLY_STATUS_FULL;
1562                         else if (battery->ps_connected)
1563                                 val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING;
1564                         else
1565                                 val->intval = POWER_SUPPLY_STATUS_DISCHARGING;
1566                         break;
1567                 default:
1568                         ret = -EINVAL;
1569                         break;
1570         }
1571
1572         return ret;
1573 }
1574
1575 static int __wacom_initialize_battery(struct wacom *wacom,
1576                                       struct wacom_battery *battery)
1577 {
1578         static atomic_t battery_no = ATOMIC_INIT(0);
1579         struct device *dev = &wacom->hdev->dev;
1580         struct power_supply_config psy_cfg = { .drv_data = battery, };
1581         struct power_supply *ps_bat;
1582         struct power_supply_desc *bat_desc = &battery->bat_desc;
1583         unsigned long n;
1584         int error;
1585
1586         if (!devres_open_group(dev, bat_desc, GFP_KERNEL))
1587                 return -ENOMEM;
1588
1589         battery->wacom = wacom;
1590
1591         n = atomic_inc_return(&battery_no) - 1;
1592
1593         bat_desc->properties = wacom_battery_props;
1594         bat_desc->num_properties = ARRAY_SIZE(wacom_battery_props);
1595         bat_desc->get_property = wacom_battery_get_property;
1596         sprintf(battery->bat_name, "wacom_battery_%ld", n);
1597         bat_desc->name = battery->bat_name;
1598         bat_desc->type = POWER_SUPPLY_TYPE_USB;
1599         bat_desc->use_for_apm = 0;
1600
1601         ps_bat = devm_power_supply_register(dev, bat_desc, &psy_cfg);
1602         if (IS_ERR(ps_bat)) {
1603                 error = PTR_ERR(ps_bat);
1604                 goto err;
1605         }
1606
1607         power_supply_powers(ps_bat, &wacom->hdev->dev);
1608
1609         battery->battery = ps_bat;
1610
1611         devres_close_group(dev, bat_desc);
1612         return 0;
1613
1614 err:
1615         devres_release_group(dev, bat_desc);
1616         return error;
1617 }
1618
1619 static int wacom_initialize_battery(struct wacom *wacom)
1620 {
1621         if (wacom->wacom_wac.features.quirks & WACOM_QUIRK_BATTERY)
1622                 return __wacom_initialize_battery(wacom, &wacom->battery);
1623
1624         return 0;
1625 }
1626
1627 static void wacom_destroy_battery(struct wacom *wacom)
1628 {
1629         if (wacom->battery.battery) {
1630                 devres_release_group(&wacom->hdev->dev,
1631                                      &wacom->battery.bat_desc);
1632                 wacom->battery.battery = NULL;
1633         }
1634 }
1635
1636 static ssize_t wacom_show_speed(struct device *dev,
1637                                 struct device_attribute
1638                                 *attr, char *buf)
1639 {
1640         struct hid_device *hdev = to_hid_device(dev);
1641         struct wacom *wacom = hid_get_drvdata(hdev);
1642
1643         return snprintf(buf, PAGE_SIZE, "%i\n", wacom->wacom_wac.bt_high_speed);
1644 }
1645
1646 static ssize_t wacom_store_speed(struct device *dev,
1647                                 struct device_attribute *attr,
1648                                 const char *buf, size_t count)
1649 {
1650         struct hid_device *hdev = to_hid_device(dev);
1651         struct wacom *wacom = hid_get_drvdata(hdev);
1652         u8 new_speed;
1653
1654         if (kstrtou8(buf, 0, &new_speed))
1655                 return -EINVAL;
1656
1657         if (new_speed != 0 && new_speed != 1)
1658                 return -EINVAL;
1659
1660         wacom_bt_query_tablet_data(hdev, new_speed, &wacom->wacom_wac.features);
1661
1662         return count;
1663 }
1664
1665 static DEVICE_ATTR(speed, DEV_ATTR_RW_PERM,
1666                 wacom_show_speed, wacom_store_speed);
1667
1668
1669 static ssize_t wacom_show_remote_mode(struct kobject *kobj,
1670                                       struct kobj_attribute *kattr,
1671                                       char *buf, int index)
1672 {
1673         struct device *dev = kobj_to_dev(kobj->parent);
1674         struct hid_device *hdev = to_hid_device(dev);
1675         struct wacom *wacom = hid_get_drvdata(hdev);
1676         u8 mode;
1677
1678         mode = wacom->led.groups[index].select;
1679         return sprintf(buf, "%d\n", mode < 3 ? mode : -1);
1680 }
1681
1682 #define DEVICE_EKR_ATTR_GROUP(SET_ID)                                   \
1683 static ssize_t wacom_show_remote##SET_ID##_mode(struct kobject *kobj,   \
1684                                struct kobj_attribute *kattr, char *buf) \
1685 {                                                                       \
1686         return wacom_show_remote_mode(kobj, kattr, buf, SET_ID);        \
1687 }                                                                       \
1688 static struct kobj_attribute remote##SET_ID##_mode_attr = {             \
1689         .attr = {.name = "remote_mode",                                 \
1690                 .mode = DEV_ATTR_RO_PERM},                              \
1691         .show = wacom_show_remote##SET_ID##_mode,                       \
1692 };                                                                      \
1693 static struct attribute *remote##SET_ID##_serial_attrs[] = {            \
1694         &remote##SET_ID##_mode_attr.attr,                               \
1695         NULL                                                            \
1696 };                                                                      \
1697 static struct attribute_group remote##SET_ID##_serial_group = {         \
1698         .name = NULL,                                                   \
1699         .attrs = remote##SET_ID##_serial_attrs,                         \
1700 }
1701
1702 DEVICE_EKR_ATTR_GROUP(0);
1703 DEVICE_EKR_ATTR_GROUP(1);
1704 DEVICE_EKR_ATTR_GROUP(2);
1705 DEVICE_EKR_ATTR_GROUP(3);
1706 DEVICE_EKR_ATTR_GROUP(4);
1707
1708 static int wacom_remote_create_attr_group(struct wacom *wacom, __u32 serial,
1709                                           int index)
1710 {
1711         int error = 0;
1712         struct wacom_remote *remote = wacom->remote;
1713
1714         remote->remotes[index].group.name = devm_kasprintf(&wacom->hdev->dev,
1715                                                           GFP_KERNEL,
1716                                                           "%d", serial);
1717         if (!remote->remotes[index].group.name)
1718                 return -ENOMEM;
1719
1720         error = __wacom_devm_sysfs_create_group(wacom, remote->remote_dir,
1721                                                 &remote->remotes[index].group);
1722         if (error) {
1723                 remote->remotes[index].group.name = NULL;
1724                 hid_err(wacom->hdev,
1725                         "cannot create sysfs group err: %d\n", error);
1726                 return error;
1727         }
1728
1729         return 0;
1730 }
1731
1732 static int wacom_cmd_unpair_remote(struct wacom *wacom, unsigned char selector)
1733 {
1734         const size_t buf_size = 2;
1735         unsigned char *buf;
1736         int retval;
1737
1738         buf = kzalloc(buf_size, GFP_KERNEL);
1739         if (!buf)
1740                 return -ENOMEM;
1741
1742         buf[0] = WAC_CMD_DELETE_PAIRING;
1743         buf[1] = selector;
1744
1745         retval = wacom_set_report(wacom->hdev, HID_OUTPUT_REPORT, buf,
1746                                   buf_size, WAC_CMD_RETRIES);
1747         kfree(buf);
1748
1749         return retval;
1750 }
1751
1752 static ssize_t wacom_store_unpair_remote(struct kobject *kobj,
1753                                          struct kobj_attribute *attr,
1754                                          const char *buf, size_t count)
1755 {
1756         unsigned char selector = 0;
1757         struct device *dev = kobj_to_dev(kobj->parent);
1758         struct hid_device *hdev = to_hid_device(dev);
1759         struct wacom *wacom = hid_get_drvdata(hdev);
1760         int err;
1761
1762         if (!strncmp(buf, "*\n", 2)) {
1763                 selector = WAC_CMD_UNPAIR_ALL;
1764         } else {
1765                 hid_info(wacom->hdev, "remote: unrecognized unpair code: %s\n",
1766                          buf);
1767                 return -1;
1768         }
1769
1770         mutex_lock(&wacom->lock);
1771
1772         err = wacom_cmd_unpair_remote(wacom, selector);
1773         mutex_unlock(&wacom->lock);
1774
1775         return err < 0 ? err : count;
1776 }
1777
1778 static struct kobj_attribute unpair_remote_attr = {
1779         .attr = {.name = "unpair_remote", .mode = 0200},
1780         .store = wacom_store_unpair_remote,
1781 };
1782
1783 static const struct attribute *remote_unpair_attrs[] = {
1784         &unpair_remote_attr.attr,
1785         NULL
1786 };
1787
1788 static void wacom_remotes_destroy(void *data)
1789 {
1790         struct wacom *wacom = data;
1791         struct wacom_remote *remote = wacom->remote;
1792
1793         if (!remote)
1794                 return;
1795
1796         kobject_put(remote->remote_dir);
1797         kfifo_free(&remote->remote_fifo);
1798         wacom->remote = NULL;
1799 }
1800
1801 static int wacom_initialize_remotes(struct wacom *wacom)
1802 {
1803         int error = 0;
1804         struct wacom_remote *remote;
1805         int i;
1806
1807         if (wacom->wacom_wac.features.type != REMOTE)
1808                 return 0;
1809
1810         remote = devm_kzalloc(&wacom->hdev->dev, sizeof(*wacom->remote),
1811                               GFP_KERNEL);
1812         if (!remote)
1813                 return -ENOMEM;
1814
1815         wacom->remote = remote;
1816
1817         spin_lock_init(&remote->remote_lock);
1818
1819         error = kfifo_alloc(&remote->remote_fifo,
1820                         5 * sizeof(struct wacom_remote_data),
1821                         GFP_KERNEL);
1822         if (error) {
1823                 hid_err(wacom->hdev, "failed allocating remote_fifo\n");
1824                 return -ENOMEM;
1825         }
1826
1827         remote->remotes[0].group = remote0_serial_group;
1828         remote->remotes[1].group = remote1_serial_group;
1829         remote->remotes[2].group = remote2_serial_group;
1830         remote->remotes[3].group = remote3_serial_group;
1831         remote->remotes[4].group = remote4_serial_group;
1832
1833         remote->remote_dir = kobject_create_and_add("wacom_remote",
1834                                                     &wacom->hdev->dev.kobj);
1835         if (!remote->remote_dir)
1836                 return -ENOMEM;
1837
1838         error = sysfs_create_files(remote->remote_dir, remote_unpair_attrs);
1839
1840         if (error) {
1841                 hid_err(wacom->hdev,
1842                         "cannot create sysfs group err: %d\n", error);
1843                 return error;
1844         }
1845
1846         for (i = 0; i < WACOM_MAX_REMOTES; i++) {
1847                 wacom->led.groups[i].select = WACOM_STATUS_UNKNOWN;
1848                 remote->remotes[i].serial = 0;
1849         }
1850
1851         error = devm_add_action_or_reset(&wacom->hdev->dev,
1852                                          wacom_remotes_destroy, wacom);
1853         if (error)
1854                 return error;
1855
1856         return 0;
1857 }
1858
1859 static struct input_dev *wacom_allocate_input(struct wacom *wacom)
1860 {
1861         struct input_dev *input_dev;
1862         struct hid_device *hdev = wacom->hdev;
1863         struct wacom_wac *wacom_wac = &(wacom->wacom_wac);
1864
1865         input_dev = devm_input_allocate_device(&hdev->dev);
1866         if (!input_dev)
1867                 return NULL;
1868
1869         input_dev->name = wacom_wac->features.name;
1870         input_dev->phys = hdev->phys;
1871         input_dev->dev.parent = &hdev->dev;
1872         input_dev->open = wacom_open;
1873         input_dev->close = wacom_close;
1874         input_dev->uniq = hdev->uniq;
1875         input_dev->id.bustype = hdev->bus;
1876         input_dev->id.vendor  = hdev->vendor;
1877         input_dev->id.product = wacom_wac->pid ? wacom_wac->pid : hdev->product;
1878         input_dev->id.version = hdev->version;
1879         input_set_drvdata(input_dev, wacom);
1880
1881         return input_dev;
1882 }
1883
1884 static int wacom_allocate_inputs(struct wacom *wacom)
1885 {
1886         struct wacom_wac *wacom_wac = &(wacom->wacom_wac);
1887
1888         wacom_wac->pen_input = wacom_allocate_input(wacom);
1889         wacom_wac->touch_input = wacom_allocate_input(wacom);
1890         wacom_wac->pad_input = wacom_allocate_input(wacom);
1891         if (!wacom_wac->pen_input ||
1892             !wacom_wac->touch_input ||
1893             !wacom_wac->pad_input)
1894                 return -ENOMEM;
1895
1896         wacom_wac->pen_input->name = wacom_wac->pen_name;
1897         wacom_wac->touch_input->name = wacom_wac->touch_name;
1898         wacom_wac->pad_input->name = wacom_wac->pad_name;
1899
1900         return 0;
1901 }
1902
1903 static int wacom_register_inputs(struct wacom *wacom)
1904 {
1905         struct input_dev *pen_input_dev, *touch_input_dev, *pad_input_dev;
1906         struct wacom_wac *wacom_wac = &(wacom->wacom_wac);
1907         int error = 0;
1908
1909         pen_input_dev = wacom_wac->pen_input;
1910         touch_input_dev = wacom_wac->touch_input;
1911         pad_input_dev = wacom_wac->pad_input;
1912
1913         if (!pen_input_dev || !touch_input_dev || !pad_input_dev)
1914                 return -EINVAL;
1915
1916         error = wacom_setup_pen_input_capabilities(pen_input_dev, wacom_wac);
1917         if (error) {
1918                 /* no pen in use on this interface */
1919                 input_free_device(pen_input_dev);
1920                 wacom_wac->pen_input = NULL;
1921                 pen_input_dev = NULL;
1922         } else {
1923                 error = input_register_device(pen_input_dev);
1924                 if (error)
1925                         goto fail;
1926         }
1927
1928         error = wacom_setup_touch_input_capabilities(touch_input_dev, wacom_wac);
1929         if (error) {
1930                 /* no touch in use on this interface */
1931                 input_free_device(touch_input_dev);
1932                 wacom_wac->touch_input = NULL;
1933                 touch_input_dev = NULL;
1934         } else {
1935                 error = input_register_device(touch_input_dev);
1936                 if (error)
1937                         goto fail;
1938         }
1939
1940         error = wacom_setup_pad_input_capabilities(pad_input_dev, wacom_wac);
1941         if (error) {
1942                 /* no pad in use on this interface */
1943                 input_free_device(pad_input_dev);
1944                 wacom_wac->pad_input = NULL;
1945                 pad_input_dev = NULL;
1946         } else {
1947                 error = input_register_device(pad_input_dev);
1948                 if (error)
1949                         goto fail;
1950         }
1951
1952         return 0;
1953
1954 fail:
1955         wacom_wac->pad_input = NULL;
1956         wacom_wac->touch_input = NULL;
1957         wacom_wac->pen_input = NULL;
1958         return error;
1959 }
1960
1961 /*
1962  * Not all devices report physical dimensions from HID.
1963  * Compute the default from hardcoded logical dimension
1964  * and resolution before driver overwrites them.
1965  */
1966 static void wacom_set_default_phy(struct wacom_features *features)
1967 {
1968         if (features->x_resolution) {
1969                 features->x_phy = (features->x_max * 100) /
1970                                         features->x_resolution;
1971                 features->y_phy = (features->y_max * 100) /
1972                                         features->y_resolution;
1973         }
1974 }
1975
1976 static void wacom_calculate_res(struct wacom_features *features)
1977 {
1978         /* set unit to "100th of a mm" for devices not reported by HID */
1979         if (!features->unit) {
1980                 features->unit = 0x11;
1981                 features->unitExpo = -3;
1982         }
1983
1984         features->x_resolution = wacom_calc_hid_res(features->x_max,
1985                                                     features->x_phy,
1986                                                     features->unit,
1987                                                     features->unitExpo);
1988         features->y_resolution = wacom_calc_hid_res(features->y_max,
1989                                                     features->y_phy,
1990                                                     features->unit,
1991                                                     features->unitExpo);
1992 }
1993
1994 void wacom_battery_work(struct work_struct *work)
1995 {
1996         struct wacom *wacom = container_of(work, struct wacom, battery_work);
1997
1998         if ((wacom->wacom_wac.features.quirks & WACOM_QUIRK_BATTERY) &&
1999              !wacom->battery.battery) {
2000                 wacom_initialize_battery(wacom);
2001         }
2002         else if (!(wacom->wacom_wac.features.quirks & WACOM_QUIRK_BATTERY) &&
2003                  wacom->battery.battery) {
2004                 wacom_destroy_battery(wacom);
2005         }
2006 }
2007
2008 static size_t wacom_compute_pktlen(struct hid_device *hdev)
2009 {
2010         struct hid_report_enum *report_enum;
2011         struct hid_report *report;
2012         size_t size = 0;
2013
2014         report_enum = hdev->report_enum + HID_INPUT_REPORT;
2015
2016         list_for_each_entry(report, &report_enum->report_list, list) {
2017                 size_t report_size = hid_report_len(report);
2018                 if (report_size > size)
2019                         size = report_size;
2020         }
2021
2022         return size;
2023 }
2024
2025 static void wacom_update_name(struct wacom *wacom, const char *suffix)
2026 {
2027         struct wacom_wac *wacom_wac = &wacom->wacom_wac;
2028         struct wacom_features *features = &wacom_wac->features;
2029         char name[WACOM_NAME_MAX];
2030
2031         /* Generic devices name unspecified */
2032         if ((features->type == HID_GENERIC) && !strcmp("Wacom HID", features->name)) {
2033                 char *product_name = wacom->hdev->name;
2034
2035                 if (hid_is_using_ll_driver(wacom->hdev, &usb_hid_driver)) {
2036                         struct usb_interface *intf = to_usb_interface(wacom->hdev->dev.parent);
2037                         struct usb_device *dev = interface_to_usbdev(intf);
2038                         product_name = dev->product;
2039                 }
2040
2041                 if (wacom->hdev->bus == BUS_I2C) {
2042                         snprintf(name, sizeof(name), "%s %X",
2043                                  features->name, wacom->hdev->product);
2044                 } else if (strstr(product_name, "Wacom") ||
2045                            strstr(product_name, "wacom") ||
2046                            strstr(product_name, "WACOM")) {
2047                         strlcpy(name, product_name, sizeof(name));
2048                 } else {
2049                         snprintf(name, sizeof(name), "Wacom %s", product_name);
2050                 }
2051
2052                 /* strip out excess whitespaces */
2053                 while (1) {
2054                         char *gap = strstr(name, "  ");
2055                         if (gap == NULL)
2056                                 break;
2057                         /* shift everything including the terminator */
2058                         memmove(gap, gap+1, strlen(gap));
2059                 }
2060
2061                 /* get rid of trailing whitespace */
2062                 if (name[strlen(name)-1] == ' ')
2063                         name[strlen(name)-1] = '\0';
2064         } else {
2065                 strlcpy(name, features->name, sizeof(name));
2066         }
2067
2068         snprintf(wacom_wac->name, sizeof(wacom_wac->name), "%s%s",
2069                  name, suffix);
2070
2071         /* Append the device type to the name */
2072         snprintf(wacom_wac->pen_name, sizeof(wacom_wac->pen_name),
2073                 "%s%s Pen", name, suffix);
2074         snprintf(wacom_wac->touch_name, sizeof(wacom_wac->touch_name),
2075                 "%s%s Finger", name, suffix);
2076         snprintf(wacom_wac->pad_name, sizeof(wacom_wac->pad_name),
2077                 "%s%s Pad", name, suffix);
2078 }
2079
2080 static void wacom_release_resources(struct wacom *wacom)
2081 {
2082         struct hid_device *hdev = wacom->hdev;
2083
2084         if (!wacom->resources)
2085                 return;
2086
2087         devres_release_group(&hdev->dev, wacom);
2088
2089         wacom->resources = false;
2090
2091         wacom->wacom_wac.pen_input = NULL;
2092         wacom->wacom_wac.touch_input = NULL;
2093         wacom->wacom_wac.pad_input = NULL;
2094 }
2095
2096 static void wacom_set_shared_values(struct wacom_wac *wacom_wac)
2097 {
2098         if (wacom_wac->features.device_type & WACOM_DEVICETYPE_TOUCH) {
2099                 wacom_wac->shared->type = wacom_wac->features.type;
2100                 wacom_wac->shared->touch_input = wacom_wac->touch_input;
2101         }
2102
2103         if (wacom_wac->has_mute_touch_switch) {
2104                 wacom_wac->shared->has_mute_touch_switch = true;
2105                 wacom_wac->shared->is_touch_on = true;
2106         }
2107
2108         if (wacom_wac->shared->has_mute_touch_switch &&
2109             wacom_wac->shared->touch_input) {
2110                 set_bit(EV_SW, wacom_wac->shared->touch_input->evbit);
2111                 input_set_capability(wacom_wac->shared->touch_input, EV_SW,
2112                                      SW_MUTE_DEVICE);
2113         }
2114 }
2115
2116 static int wacom_parse_and_register(struct wacom *wacom, bool wireless)
2117 {
2118         struct wacom_wac *wacom_wac = &wacom->wacom_wac;
2119         struct wacom_features *features = &wacom_wac->features;
2120         struct hid_device *hdev = wacom->hdev;
2121         int error;
2122         unsigned int connect_mask = HID_CONNECT_HIDRAW;
2123
2124         features->pktlen = wacom_compute_pktlen(hdev);
2125         if (features->pktlen > WACOM_PKGLEN_MAX)
2126                 return -EINVAL;
2127
2128         if (!devres_open_group(&hdev->dev, wacom, GFP_KERNEL))
2129                 return -ENOMEM;
2130
2131         wacom->resources = true;
2132
2133         error = wacom_allocate_inputs(wacom);
2134         if (error)
2135                 goto fail;
2136
2137         /*
2138          * Bamboo Pad has a generic hid handling for the Pen, and we switch it
2139          * into debug mode for the touch part.
2140          * We ignore the other interfaces.
2141          */
2142         if (features->type == BAMBOO_PAD) {
2143                 if (features->pktlen == WACOM_PKGLEN_PENABLED) {
2144                         features->type = HID_GENERIC;
2145                 } else if ((features->pktlen != WACOM_PKGLEN_BPAD_TOUCH) &&
2146                            (features->pktlen != WACOM_PKGLEN_BPAD_TOUCH_USB)) {
2147                         error = -ENODEV;
2148                         goto fail;
2149                 }
2150         }
2151
2152         /* set the default size in case we do not get them from hid */
2153         wacom_set_default_phy(features);
2154
2155         /* Retrieve the physical and logical size for touch devices */
2156         wacom_retrieve_hid_descriptor(hdev, features);
2157         wacom_setup_device_quirks(wacom);
2158
2159         if (features->device_type == WACOM_DEVICETYPE_NONE &&
2160             features->type != WIRELESS) {
2161                 error = features->type == HID_GENERIC ? -ENODEV : 0;
2162
2163                 dev_warn(&hdev->dev, "Unknown device_type for '%s'. %s.",
2164                          hdev->name,
2165                          error ? "Ignoring" : "Assuming pen");
2166
2167                 if (error)
2168                         goto fail;
2169
2170                 features->device_type |= WACOM_DEVICETYPE_PEN;
2171         }
2172
2173         wacom_calculate_res(features);
2174
2175         wacom_update_name(wacom, wireless ? " (WL)" : "");
2176
2177         /* pen only Bamboo neither support touch nor pad */
2178         if ((features->type == BAMBOO_PEN) &&
2179             ((features->device_type & WACOM_DEVICETYPE_TOUCH) ||
2180             (features->device_type & WACOM_DEVICETYPE_PAD))) {
2181                 error = -ENODEV;
2182                 goto fail;
2183         }
2184
2185         error = wacom_add_shared_data(hdev);
2186         if (error)
2187                 goto fail;
2188
2189         if (!(features->device_type & WACOM_DEVICETYPE_WL_MONITOR) &&
2190              (features->quirks & WACOM_QUIRK_BATTERY)) {
2191                 error = wacom_initialize_battery(wacom);
2192                 if (error)
2193                         goto fail;
2194         }
2195
2196         error = wacom_register_inputs(wacom);
2197         if (error)
2198                 goto fail;
2199
2200         if (wacom->wacom_wac.features.device_type & WACOM_DEVICETYPE_PAD) {
2201                 error = wacom_initialize_leds(wacom);
2202                 if (error)
2203                         goto fail;
2204
2205                 error = wacom_initialize_remotes(wacom);
2206                 if (error)
2207                         goto fail;
2208         }
2209
2210         if (features->type == HID_GENERIC)
2211                 connect_mask |= HID_CONNECT_DRIVER;
2212
2213         /* Regular HID work starts now */
2214         error = hid_hw_start(hdev, connect_mask);
2215         if (error) {
2216                 hid_err(hdev, "hw start failed\n");
2217                 goto fail;
2218         }
2219
2220         if (!wireless) {
2221                 /* Note that if query fails it is not a hard failure */
2222                 wacom_query_tablet_data(wacom);
2223         }
2224
2225         /* touch only Bamboo doesn't support pen */
2226         if ((features->type == BAMBOO_TOUCH) &&
2227             (features->device_type & WACOM_DEVICETYPE_PEN)) {
2228                 cancel_delayed_work_sync(&wacom->init_work);
2229                 _wacom_query_tablet_data(wacom);
2230                 error = -ENODEV;
2231                 goto fail_quirks;
2232         }
2233
2234         if (features->device_type & WACOM_DEVICETYPE_WL_MONITOR)
2235                 error = hid_hw_open(hdev);
2236
2237         wacom_set_shared_values(wacom_wac);
2238         devres_close_group(&hdev->dev, wacom);
2239
2240         return 0;
2241
2242 fail_quirks:
2243         hid_hw_stop(hdev);
2244 fail:
2245         wacom_release_resources(wacom);
2246         return error;
2247 }
2248
2249 static void wacom_wireless_work(struct work_struct *work)
2250 {
2251         struct wacom *wacom = container_of(work, struct wacom, wireless_work);
2252         struct usb_device *usbdev = wacom->usbdev;
2253         struct wacom_wac *wacom_wac = &wacom->wacom_wac;
2254         struct hid_device *hdev1, *hdev2;
2255         struct wacom *wacom1, *wacom2;
2256         struct wacom_wac *wacom_wac1, *wacom_wac2;
2257         int error;
2258
2259         /*
2260          * Regardless if this is a disconnect or a new tablet,
2261          * remove any existing input and battery devices.
2262          */
2263
2264         wacom_destroy_battery(wacom);
2265
2266         /* Stylus interface */
2267         hdev1 = usb_get_intfdata(usbdev->config->interface[1]);
2268         wacom1 = hid_get_drvdata(hdev1);
2269         wacom_wac1 = &(wacom1->wacom_wac);
2270         wacom_release_resources(wacom1);
2271
2272         /* Touch interface */
2273         hdev2 = usb_get_intfdata(usbdev->config->interface[2]);
2274         wacom2 = hid_get_drvdata(hdev2);
2275         wacom_wac2 = &(wacom2->wacom_wac);
2276         wacom_release_resources(wacom2);
2277
2278         if (wacom_wac->pid == 0) {
2279                 hid_info(wacom->hdev, "wireless tablet disconnected\n");
2280         } else {
2281                 const struct hid_device_id *id = wacom_ids;
2282
2283                 hid_info(wacom->hdev, "wireless tablet connected with PID %x\n",
2284                          wacom_wac->pid);
2285
2286                 while (id->bus) {
2287                         if (id->vendor == USB_VENDOR_ID_WACOM &&
2288                             id->product == wacom_wac->pid)
2289                                 break;
2290                         id++;
2291                 }
2292
2293                 if (!id->bus) {
2294                         hid_info(wacom->hdev, "ignoring unknown PID.\n");
2295                         return;
2296                 }
2297
2298                 /* Stylus interface */
2299                 wacom_wac1->features =
2300                         *((struct wacom_features *)id->driver_data);
2301
2302                 wacom_wac1->pid = wacom_wac->pid;
2303                 hid_hw_stop(hdev1);
2304                 error = wacom_parse_and_register(wacom1, true);
2305                 if (error)
2306                         goto fail;
2307
2308                 /* Touch interface */
2309                 if (wacom_wac1->features.touch_max ||
2310                     (wacom_wac1->features.type >= INTUOSHT &&
2311                     wacom_wac1->features.type <= BAMBOO_PT)) {
2312                         wacom_wac2->features =
2313                                 *((struct wacom_features *)id->driver_data);
2314                         wacom_wac2->pid = wacom_wac->pid;
2315                         hid_hw_stop(hdev2);
2316                         error = wacom_parse_and_register(wacom2, true);
2317                         if (error)
2318                                 goto fail;
2319                 }
2320
2321                 strlcpy(wacom_wac->name, wacom_wac1->name,
2322                         sizeof(wacom_wac->name));
2323                 error = wacom_initialize_battery(wacom);
2324                 if (error)
2325                         goto fail;
2326         }
2327
2328         return;
2329
2330 fail:
2331         wacom_release_resources(wacom1);
2332         wacom_release_resources(wacom2);
2333         return;
2334 }
2335
2336 static void wacom_remote_destroy_one(struct wacom *wacom, unsigned int index)
2337 {
2338         struct wacom_remote *remote = wacom->remote;
2339         u32 serial = remote->remotes[index].serial;
2340         int i;
2341         unsigned long flags;
2342
2343         spin_lock_irqsave(&remote->remote_lock, flags);
2344         remote->remotes[index].registered = false;
2345         spin_unlock_irqrestore(&remote->remote_lock, flags);
2346
2347         if (remote->remotes[index].battery.battery)
2348                 devres_release_group(&wacom->hdev->dev,
2349                                      &remote->remotes[index].battery.bat_desc);
2350
2351         if (remote->remotes[index].group.name)
2352                 devres_release_group(&wacom->hdev->dev,
2353                                      &remote->remotes[index]);
2354
2355         for (i = 0; i < WACOM_MAX_REMOTES; i++) {
2356                 if (remote->remotes[i].serial == serial) {
2357                         remote->remotes[i].serial = 0;
2358                         remote->remotes[i].group.name = NULL;
2359                         remote->remotes[i].registered = false;
2360                         remote->remotes[i].battery.battery = NULL;
2361                         wacom->led.groups[i].select = WACOM_STATUS_UNKNOWN;
2362                 }
2363         }
2364 }
2365
2366 static int wacom_remote_create_one(struct wacom *wacom, u32 serial,
2367                                    unsigned int index)
2368 {
2369         struct wacom_remote *remote = wacom->remote;
2370         struct device *dev = &wacom->hdev->dev;
2371         int error, k;
2372
2373         /* A remote can pair more than once with an EKR,
2374          * check to make sure this serial isn't already paired.
2375          */
2376         for (k = 0; k < WACOM_MAX_REMOTES; k++) {
2377                 if (remote->remotes[k].serial == serial)
2378                         break;
2379         }
2380
2381         if (k < WACOM_MAX_REMOTES) {
2382                 remote->remotes[index].serial = serial;
2383                 return 0;
2384         }
2385
2386         if (!devres_open_group(dev, &remote->remotes[index], GFP_KERNEL))
2387                 return -ENOMEM;
2388
2389         error = wacom_remote_create_attr_group(wacom, serial, index);
2390         if (error)
2391                 goto fail;
2392
2393         remote->remotes[index].input = wacom_allocate_input(wacom);
2394         if (!remote->remotes[index].input) {
2395                 error = -ENOMEM;
2396                 goto fail;
2397         }
2398         remote->remotes[index].input->uniq = remote->remotes[index].group.name;
2399         remote->remotes[index].input->name = wacom->wacom_wac.pad_name;
2400
2401         if (!remote->remotes[index].input->name) {
2402                 error = -EINVAL;
2403                 goto fail;
2404         }
2405
2406         error = wacom_setup_pad_input_capabilities(remote->remotes[index].input,
2407                                                    &wacom->wacom_wac);
2408         if (error)
2409                 goto fail;
2410
2411         remote->remotes[index].serial = serial;
2412
2413         error = input_register_device(remote->remotes[index].input);
2414         if (error)
2415                 goto fail;
2416
2417         error = wacom_led_groups_alloc_and_register_one(
2418                                         &remote->remotes[index].input->dev,
2419                                         wacom, index, 3, true);
2420         if (error)
2421                 goto fail;
2422
2423         remote->remotes[index].registered = true;
2424
2425         devres_close_group(dev, &remote->remotes[index]);
2426         return 0;
2427
2428 fail:
2429         devres_release_group(dev, &remote->remotes[index]);
2430         remote->remotes[index].serial = 0;
2431         return error;
2432 }
2433
2434 static int wacom_remote_attach_battery(struct wacom *wacom, int index)
2435 {
2436         struct wacom_remote *remote = wacom->remote;
2437         int error;
2438
2439         if (!remote->remotes[index].registered)
2440                 return 0;
2441
2442         if (remote->remotes[index].battery.battery)
2443                 return 0;
2444
2445         if (wacom->led.groups[index].select == WACOM_STATUS_UNKNOWN)
2446                 return 0;
2447
2448         error = __wacom_initialize_battery(wacom,
2449                                         &wacom->remote->remotes[index].battery);
2450         if (error)
2451                 return error;
2452
2453         return 0;
2454 }
2455
2456 static void wacom_remote_work(struct work_struct *work)
2457 {
2458         struct wacom *wacom = container_of(work, struct wacom, remote_work);
2459         struct wacom_remote *remote = wacom->remote;
2460         struct wacom_remote_data data;
2461         unsigned long flags;
2462         unsigned int count;
2463         u32 serial;
2464         int i;
2465
2466         spin_lock_irqsave(&remote->remote_lock, flags);
2467
2468         count = kfifo_out(&remote->remote_fifo, &data, sizeof(data));
2469
2470         if (count != sizeof(data)) {
2471                 hid_err(wacom->hdev,
2472                         "workitem triggered without status available\n");
2473                 spin_unlock_irqrestore(&remote->remote_lock, flags);
2474                 return;
2475         }
2476
2477         if (!kfifo_is_empty(&remote->remote_fifo))
2478                 wacom_schedule_work(&wacom->wacom_wac, WACOM_WORKER_REMOTE);
2479
2480         spin_unlock_irqrestore(&remote->remote_lock, flags);
2481
2482         for (i = 0; i < WACOM_MAX_REMOTES; i++) {
2483                 serial = data.remote[i].serial;
2484                 if (data.remote[i].connected) {
2485
2486                         if (remote->remotes[i].serial == serial) {
2487                                 wacom_remote_attach_battery(wacom, i);
2488                                 continue;
2489                         }
2490
2491                         if (remote->remotes[i].serial)
2492                                 wacom_remote_destroy_one(wacom, i);
2493
2494                         wacom_remote_create_one(wacom, serial, i);
2495
2496                 } else if (remote->remotes[i].serial) {
2497                         wacom_remote_destroy_one(wacom, i);
2498                 }
2499         }
2500 }
2501
2502 static void wacom_mode_change_work(struct work_struct *work)
2503 {
2504         struct wacom *wacom = container_of(work, struct wacom, mode_change_work);
2505         struct wacom_shared *shared = wacom->wacom_wac.shared;
2506         struct wacom *wacom1 = NULL;
2507         struct wacom *wacom2 = NULL;
2508         bool is_direct = wacom->wacom_wac.is_direct_mode;
2509         int error = 0;
2510
2511         if (shared->pen) {
2512                 wacom1 = hid_get_drvdata(shared->pen);
2513                 wacom_release_resources(wacom1);
2514                 hid_hw_stop(wacom1->hdev);
2515                 wacom1->wacom_wac.has_mode_change = true;
2516                 wacom1->wacom_wac.is_direct_mode = is_direct;
2517         }
2518
2519         if (shared->touch) {
2520                 wacom2 = hid_get_drvdata(shared->touch);
2521                 wacom_release_resources(wacom2);
2522                 hid_hw_stop(wacom2->hdev);
2523                 wacom2->wacom_wac.has_mode_change = true;
2524                 wacom2->wacom_wac.is_direct_mode = is_direct;
2525         }
2526
2527         if (wacom1) {
2528                 error = wacom_parse_and_register(wacom1, false);
2529                 if (error)
2530                         return;
2531         }
2532
2533         if (wacom2) {
2534                 error = wacom_parse_and_register(wacom2, false);
2535                 if (error)
2536                         return;
2537         }
2538
2539         return;
2540 }
2541
2542 static int wacom_probe(struct hid_device *hdev,
2543                 const struct hid_device_id *id)
2544 {
2545         struct usb_interface *intf = to_usb_interface(hdev->dev.parent);
2546         struct usb_device *dev = interface_to_usbdev(intf);
2547         struct wacom *wacom;
2548         struct wacom_wac *wacom_wac;
2549         struct wacom_features *features;
2550         int error;
2551
2552         if (!id->driver_data)
2553                 return -EINVAL;
2554
2555         hdev->quirks |= HID_QUIRK_NO_INIT_REPORTS;
2556
2557         /* hid-core sets this quirk for the boot interface */
2558         hdev->quirks &= ~HID_QUIRK_NOGET;
2559
2560         wacom = devm_kzalloc(&hdev->dev, sizeof(struct wacom), GFP_KERNEL);
2561         if (!wacom)
2562                 return -ENOMEM;
2563
2564         hid_set_drvdata(hdev, wacom);
2565         wacom->hdev = hdev;
2566
2567         wacom_wac = &wacom->wacom_wac;
2568         wacom_wac->features = *((struct wacom_features *)id->driver_data);
2569         features = &wacom_wac->features;
2570
2571         if (features->check_for_hid_type && features->hid_type != hdev->type) {
2572                 error = -ENODEV;
2573                 goto fail;
2574         }
2575
2576         wacom_wac->hid_data.inputmode = -1;
2577         wacom_wac->mode_report = -1;
2578
2579         wacom->usbdev = dev;
2580         wacom->intf = intf;
2581         mutex_init(&wacom->lock);
2582         INIT_DELAYED_WORK(&wacom->init_work, wacom_init_work);
2583         INIT_WORK(&wacom->wireless_work, wacom_wireless_work);
2584         INIT_WORK(&wacom->battery_work, wacom_battery_work);
2585         INIT_WORK(&wacom->remote_work, wacom_remote_work);
2586         INIT_WORK(&wacom->mode_change_work, wacom_mode_change_work);
2587
2588         /* ask for the report descriptor to be loaded by HID */
2589         error = hid_parse(hdev);
2590         if (error) {
2591                 hid_err(hdev, "parse failed\n");
2592                 goto fail;
2593         }
2594
2595         error = wacom_parse_and_register(wacom, false);
2596         if (error)
2597                 goto fail;
2598
2599         if (hdev->bus == BUS_BLUETOOTH) {
2600                 error = device_create_file(&hdev->dev, &dev_attr_speed);
2601                 if (error)
2602                         hid_warn(hdev,
2603                                  "can't create sysfs speed attribute err: %d\n",
2604                                  error);
2605         }
2606
2607         return 0;
2608
2609 fail:
2610         hid_set_drvdata(hdev, NULL);
2611         return error;
2612 }
2613
2614 static void wacom_remove(struct hid_device *hdev)
2615 {
2616         struct wacom *wacom = hid_get_drvdata(hdev);
2617         struct wacom_wac *wacom_wac = &wacom->wacom_wac;
2618         struct wacom_features *features = &wacom_wac->features;
2619
2620         if (features->device_type & WACOM_DEVICETYPE_WL_MONITOR)
2621                 hid_hw_close(hdev);
2622
2623         hid_hw_stop(hdev);
2624
2625         cancel_delayed_work_sync(&wacom->init_work);
2626         cancel_work_sync(&wacom->wireless_work);
2627         cancel_work_sync(&wacom->battery_work);
2628         cancel_work_sync(&wacom->remote_work);
2629         cancel_work_sync(&wacom->mode_change_work);
2630         if (hdev->bus == BUS_BLUETOOTH)
2631                 device_remove_file(&hdev->dev, &dev_attr_speed);
2632
2633         /* make sure we don't trigger the LEDs */
2634         wacom_led_groups_release(wacom);
2635
2636         if (wacom->wacom_wac.features.type != REMOTE)
2637                 wacom_release_resources(wacom);
2638
2639         hid_set_drvdata(hdev, NULL);
2640 }
2641
2642 #ifdef CONFIG_PM
2643 static int wacom_resume(struct hid_device *hdev)
2644 {
2645         struct wacom *wacom = hid_get_drvdata(hdev);
2646
2647         mutex_lock(&wacom->lock);
2648
2649         /* switch to wacom mode first */
2650         _wacom_query_tablet_data(wacom);
2651         wacom_led_control(wacom);
2652
2653         mutex_unlock(&wacom->lock);
2654
2655         return 0;
2656 }
2657
2658 static int wacom_reset_resume(struct hid_device *hdev)
2659 {
2660         return wacom_resume(hdev);
2661 }
2662 #endif /* CONFIG_PM */
2663
2664 static struct hid_driver wacom_driver = {
2665         .name =         "wacom",
2666         .id_table =     wacom_ids,
2667         .probe =        wacom_probe,
2668         .remove =       wacom_remove,
2669         .report =       wacom_wac_report,
2670 #ifdef CONFIG_PM
2671         .resume =       wacom_resume,
2672         .reset_resume = wacom_reset_resume,
2673 #endif
2674         .raw_event =    wacom_raw_event,
2675 };
2676 module_hid_driver(wacom_driver);
2677
2678 MODULE_VERSION(DRIVER_VERSION);
2679 MODULE_AUTHOR(DRIVER_AUTHOR);
2680 MODULE_DESCRIPTION(DRIVER_DESC);
2681 MODULE_LICENSE("GPL");