drivers/hid/wacom_sys.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  *  USB Wacom tablet support - system specific code
   4  */
   5
   6 #include "wacom_wac.h"
   7 #include "wacom.h"
   8 #include <linux/input/mt.h>
   9
  10 #define WAC_MSG_RETRIES         5
  11 #define WAC_CMD_RETRIES         10
  12
  13 #define DEV_ATTR_RW_PERM (S_IRUGO | S_IWUSR | S_IWGRP)
  14 #define DEV_ATTR_WO_PERM (S_IWUSR | S_IWGRP)
  15 #define DEV_ATTR_RO_PERM (S_IRUSR | S_IRGRP)
  16
  17 static int wacom_get_report(struct hid_device *hdev, u8 type, u8 *buf,
  18                             size_t size, unsigned int retries)
  19 {
  20         int retval;
  21
  22         do {
  23                 retval = hid_hw_raw_request(hdev, buf[0], buf, size, type,
  24                                 HID_REQ_GET_REPORT);
  25         } while ((retval == -ETIMEDOUT || retval == -EAGAIN) && --retries);
  26
  27         if (retval < 0)
  28                 hid_err(hdev, "wacom_get_report: ran out of retries "
  29                         "(last error = %d)\n", retval);
  30
  31         return retval;
  32 }
  33
  34 static int wacom_set_report(struct hid_device *hdev, u8 type, u8 *buf,
  35                             size_t size, unsigned int retries)
  36 {
  37         int retval;
  38
  39         do {
  40                 retval = hid_hw_raw_request(hdev, buf[0], buf, size, type,
  41                                 HID_REQ_SET_REPORT);
  42         } while ((retval == -ETIMEDOUT || retval == -EAGAIN) && --retries);
  43
  44         if (retval < 0)
  45                 hid_err(hdev, "wacom_set_report: ran out of retries "
  46                         "(last error = %d)\n", retval);
  47
  48         return retval;
  49 }
  50
  51 static void wacom_wac_queue_insert(struct hid_device *hdev,
  52                                    struct kfifo_rec_ptr_2 *fifo,
  53                                    u8 *raw_data, int size)
  54 {
  55         bool warned = false;
  56
  57         while (kfifo_avail(fifo) < size) {
  58                 if (!warned)
  59                         hid_warn(hdev, "%s: kfifo has filled, starting to drop events\n", __func__);
  60                 warned = true;
  61
  62                 kfifo_skip(fifo);
  63         }
  64
  65         kfifo_in(fifo, raw_data, size);
  66 }
  67
  68 static void wacom_wac_queue_flush(struct hid_device *hdev,
  69                                   struct kfifo_rec_ptr_2 *fifo)
  70 {
  71         while (!kfifo_is_empty(fifo)) {
  72                 u8 buf[WACOM_PKGLEN_MAX];
  73                 int size;
  74                 int err;
  75
  76                 size = kfifo_out(fifo, buf, sizeof(buf));
  77                 err = hid_report_raw_event(hdev, HID_INPUT_REPORT, buf, size, false);
  78                 if (err) {
  79                         hid_warn(hdev, "%s: unable to flush event due to error %d\n",
  80                                  __func__, err);
  81                 }
  82         }
  83 }
  84
  85 static int wacom_wac_pen_serial_enforce(struct hid_device *hdev,
  86                 struct hid_report *report, u8 *raw_data, int report_size)
  87 {
  88         struct wacom *wacom = hid_get_drvdata(hdev);
  89         struct wacom_wac *wacom_wac = &wacom->wacom_wac;
  90         struct wacom_features *features = &wacom_wac->features;
  91         bool flush = false;
  92         bool insert = false;
  93         int i, j;
  94
  95         if (wacom_wac->serial[0] || !(features->quirks & WACOM_QUIRK_TOOLSERIAL))
  96                 return 0;
  97
  98         /* Queue events which have invalid tool type or serial number */
  99         for (i = 0; i < report->maxfield; i++) {
 100                 for (j = 0; j < report->field[i]->maxusage; j++) {
 101                         struct hid_field *field = report->field[i];
 102                         struct hid_usage *usage = &field->usage[j];
 103                         unsigned int equivalent_usage = wacom_equivalent_usage(usage->hid);
 104                         unsigned int offset;
 105                         unsigned int size;
 106                         unsigned int value;
 107
 108                         if (equivalent_usage != HID_DG_INRANGE &&
 109                             equivalent_usage != HID_DG_TOOLSERIALNUMBER &&
 110                             equivalent_usage != WACOM_HID_WD_SERIALHI &&
 111                             equivalent_usage != WACOM_HID_WD_TOOLTYPE)
 112                                 continue;
 113
 114                         offset = field->report_offset;
 115                         size = field->report_size;
 116                         value = hid_field_extract(hdev, raw_data+1, offset + j * size, size);
 117
 118                         /* If we go out of range, we need to flush the queue ASAP */
 119                         if (equivalent_usage == HID_DG_INRANGE)
 120                                 value = !value;
 121
 122                         if (value) {
 123                                 flush = true;
 124                                 switch (equivalent_usage) {
 125                                 case HID_DG_TOOLSERIALNUMBER:
 126                                         wacom_wac->serial[0] = value;
 127                                         break;
 128
 129                                 case WACOM_HID_WD_SERIALHI:
 130                                         wacom_wac->serial[0] |= ((__u64)value) << 32;
 131                                         break;
 132
 133                                 case WACOM_HID_WD_TOOLTYPE:
 134                                         wacom_wac->id[0] = value;
 135                                         break;
 136                                 }
 137                         }
 138                         else {
 139                                 insert = true;
 140                         }
 141                 }
 142         }
 143
 144         if (flush)
 145                 wacom_wac_queue_flush(hdev, wacom_wac->pen_fifo);
 146         else if (insert)
 147                 wacom_wac_queue_insert(hdev, wacom_wac->pen_fifo,
 148                                        raw_data, report_size);
 149
 150         return insert && !flush;
 151 }
 152
 153 static int wacom_raw_event(struct hid_device *hdev, struct hid_report *report,
 154                 u8 *raw_data, int size)
 155 {
 156         struct wacom *wacom = hid_get_drvdata(hdev);
 157
 158         if (wacom->wacom_wac.features.type == BOOTLOADER)
 159                 return 0;
 160
 161         if (size > WACOM_PKGLEN_MAX)
 162                 return 1;
 163
 164         if (wacom_wac_pen_serial_enforce(hdev, report, raw_data, size))
 165                 return -1;
 166
 167         memcpy(wacom->wacom_wac.data, raw_data, size);
 168
 169         wacom_wac_irq(&wacom->wacom_wac, size);
 170
 171         return 0;
 172 }
 173
 174 static int wacom_open(struct input_dev *dev)
 175 {
 176         struct wacom *wacom = input_get_drvdata(dev);
 177
 178         return hid_hw_open(wacom->hdev);
 179 }
 180
 181 static void wacom_close(struct input_dev *dev)
 182 {
 183         struct wacom *wacom = input_get_drvdata(dev);
 184
 185         /*
 186          * wacom->hdev should never be null, but surprisingly, I had the case
 187          * once while unplugging the Wacom Wireless Receiver.
 188          */
 189         if (wacom->hdev)
 190                 hid_hw_close(wacom->hdev);
 191 }
 192
 193 /*
 194  * Calculate the resolution of the X or Y axis using hidinput_calc_abs_res.
 195  */
 196 static int wacom_calc_hid_res(int logical_extents, int physical_extents,
 197                                unsigned unit, int exponent)
 198 {
 199         struct hid_field field = {
 200                 .logical_maximum = logical_extents,
 201                 .physical_maximum = physical_extents,
 202                 .unit = unit,
 203                 .unit_exponent = exponent,
 204         };
 205
 206         return hidinput_calc_abs_res(&field, ABS_X);
 207 }
 208
 209 static void wacom_hid_usage_quirk(struct hid_device *hdev,
 210                 struct hid_field *field, struct hid_usage *usage)
 211 {
 212         struct wacom *wacom = hid_get_drvdata(hdev);
 213         struct wacom_features *features = &wacom->wacom_wac.features;
 214         unsigned int equivalent_usage = wacom_equivalent_usage(usage->hid);
 215
 216         /*
 217          * The Dell Canvas 27 needs to be switched to its vendor-defined
 218          * report to provide the best resolution.
 219          */
 220         if (hdev->vendor == USB_VENDOR_ID_WACOM &&
 221             hdev->product == 0x4200 &&
 222             field->application == HID_UP_MSVENDOR) {
 223                 wacom->wacom_wac.mode_report = field->report->id;
 224                 wacom->wacom_wac.mode_value = 2;
 225         }
 226
 227         /*
 228          * ISDv4 devices which predate HID's adoption of the
 229          * HID_DG_BARELSWITCH2 usage use 0x000D0000 in its
 230          * position instead. We can accurately detect if a
 231          * usage with that value should be HID_DG_BARRELSWITCH2
 232          * based on the surrounding usages, which have remained
 233          * constant across generations.
 234          */
 235         if (features->type == HID_GENERIC &&
 236             usage->hid == 0x000D0000 &&
 237             field->application == HID_DG_PEN &&
 238             field->physical == HID_DG_STYLUS) {
 239                 int i = usage->usage_index;
 240
 241                 if (i-4 >= 0 && i+1 < field->maxusage &&
 242                     field->usage[i-4].hid == HID_DG_TIPSWITCH &&
 243                     field->usage[i-3].hid == HID_DG_BARRELSWITCH &&
 244                     field->usage[i-2].hid == HID_DG_ERASER &&
 245                     field->usage[i-1].hid == HID_DG_INVERT &&
 246                     field->usage[i+1].hid == HID_DG_INRANGE) {
 247                         usage->hid = HID_DG_BARRELSWITCH2;
 248                 }
 249         }
 250
 251         /*
 252          * Wacom's AES devices use different vendor-defined usages to
 253          * report serial number information compared to their branded
 254          * hardware. The usages are also sometimes ill-defined and do
 255          * not have the correct logical min/max values set. Lets patch
 256          * the descriptor to use the branded usage convention and fix
 257          * the errors.
 258          */
 259         if (usage->hid == WACOM_HID_WT_SERIALNUMBER &&
 260             field->report_size == 16 &&
 261             field->index + 2 < field->report->maxfield) {
 262                 struct hid_field *a = field->report->field[field->index + 1];
 263                 struct hid_field *b = field->report->field[field->index + 2];
 264
 265                 if (a->maxusage > 0 &&
 266                     a->usage[0].hid == HID_DG_TOOLSERIALNUMBER &&
 267                     a->report_size == 32 &&
 268                     b->maxusage > 0 &&
 269                     b->usage[0].hid == 0xFF000000 &&
 270                     b->report_size == 8) {
 271                         features->quirks |= WACOM_QUIRK_AESPEN;
 272                         usage->hid = WACOM_HID_WD_TOOLTYPE;
 273                         field->logical_minimum = S16_MIN;
 274                         field->logical_maximum = S16_MAX;
 275                         a->logical_minimum = S32_MIN;
 276                         a->logical_maximum = S32_MAX;
 277                         b->usage[0].hid = WACOM_HID_WD_SERIALHI;
 278                         b->logical_minimum = 0;
 279                         b->logical_maximum = U8_MAX;
 280                 }
 281         }
 282
 283         /* 2nd-generation Intuos Pro Large has incorrect Y maximum */
 284         if (hdev->vendor == USB_VENDOR_ID_WACOM &&
 285             hdev->product == 0x0358 &&
 286             WACOM_PEN_FIELD(field) &&
 287             equivalent_usage == HID_GD_Y) {
 288                 field->logical_maximum = 43200;
 289         }
 290 }
 291
 292 static void wacom_feature_mapping(struct hid_device *hdev,
 293                 struct hid_field *field, struct hid_usage *usage)
 294 {
 295         struct wacom *wacom = hid_get_drvdata(hdev);
 296         struct wacom_features *features = &wacom->wacom_wac.features;
 297         struct hid_data *hid_data = &wacom->wacom_wac.hid_data;
 298         unsigned int equivalent_usage = wacom_equivalent_usage(usage->hid);
 299         u8 *data;
 300         int ret;
 301         u32 n;
 302
 303         wacom_hid_usage_quirk(hdev, field, usage);
 304
 305         switch (equivalent_usage) {
 306         case WACOM_HID_WD_TOUCH_RING_SETTING:
 307                 wacom->generic_has_leds = true;
 308                 break;
 309         case HID_DG_CONTACTMAX:
 310                 /* leave touch_max as is if predefined */
 311                 if (!features->touch_max) {
 312                         /* read manually */
 313                         n = hid_report_len(field->report);
 314                         data = hid_alloc_report_buf(field->report, GFP_KERNEL);
 315                         if (!data)
 316                                 break;
 317                         data[0] = field->report->id;
 318                         ret = wacom_get_report(hdev, HID_FEATURE_REPORT,
 319                                                data, n, WAC_CMD_RETRIES);
 320                         if (ret == n && features->type == HID_GENERIC) {
 321                                 ret = hid_report_raw_event(hdev,
 322                                         HID_FEATURE_REPORT, data, n, 0);
 323                         } else if (ret == 2 && features->type != HID_GENERIC) {
 324                                 features->touch_max = data[1];
 325                         } else {
 326                                 features->touch_max = 16;
 327                                 hid_warn(hdev, "wacom_feature_mapping: "
 328                                          "could not get HID_DG_CONTACTMAX, "
 329                                          "defaulting to %d\n",
 330                                           features->touch_max);
 331                         }
 332                         kfree(data);
 333                 }
 334                 break;
 335         case HID_DG_INPUTMODE:
 336                 /* Ignore if value index is out of bounds. */
 337                 if (usage->usage_index >= field->report_count) {
 338                         dev_err(&hdev->dev, "HID_DG_INPUTMODE out of range\n");
 339                         break;
 340                 }
 341
 342                 hid_data->inputmode = field->report->id;
 343                 hid_data->inputmode_index = usage->usage_index;
 344                 break;
 345
 346         case HID_UP_DIGITIZER:
 347                 if (field->report->id == 0x0B &&
 348                     (field->application == WACOM_HID_G9_PEN ||
 349                      field->application == WACOM_HID_G11_PEN)) {
 350                         wacom->wacom_wac.mode_report = field->report->id;
 351                         wacom->wacom_wac.mode_value = 0;
 352                 }
 353                 break;
 354
 355         case WACOM_HID_WD_DATAMODE:
 356                 wacom->wacom_wac.mode_report = field->report->id;
 357                 wacom->wacom_wac.mode_value = 2;
 358                 break;
 359
 360         case WACOM_HID_UP_G9:
 361         case WACOM_HID_UP_G11:
 362                 if (field->report->id == 0x03 &&
 363                     (field->application == WACOM_HID_G9_TOUCHSCREEN ||
 364                      field->application == WACOM_HID_G11_TOUCHSCREEN)) {
 365                         wacom->wacom_wac.mode_report = field->report->id;
 366                         wacom->wacom_wac.mode_value = 0;
 367                 }
 368                 break;
 369         case WACOM_HID_WD_OFFSETLEFT:
 370         case WACOM_HID_WD_OFFSETTOP:
 371         case WACOM_HID_WD_OFFSETRIGHT:
 372         case WACOM_HID_WD_OFFSETBOTTOM:
 373                 /* read manually */
 374                 n = hid_report_len(field->report);
 375                 data = hid_alloc_report_buf(field->report, GFP_KERNEL);
 376                 if (!data)
 377                         break;
 378                 data[0] = field->report->id;
 379                 ret = wacom_get_report(hdev, HID_FEATURE_REPORT,
 380                                         data, n, WAC_CMD_RETRIES);
 381                 if (ret == n) {
 382                         ret = hid_report_raw_event(hdev, HID_FEATURE_REPORT,
 383                                                    data, n, 0);
 384                 } else {
 385                         hid_warn(hdev, "%s: could not retrieve sensor offsets\n",
 386                                  __func__);
 387                 }
 388                 kfree(data);
 389                 break;
 390         }
 391 }
 392
 393 /*
 394  * Interface Descriptor of wacom devices can be incomplete and
 395  * inconsistent so wacom_features table is used to store stylus
 396  * device's packet lengths, various maximum values, and tablet
 397  * resolution based on product ID's.
 398  *
 399  * For devices that contain 2 interfaces, wacom_features table is
 400  * inaccurate for the touch interface.  Since the Interface Descriptor
 401  * for touch interfaces has pretty complete data, this function exists
 402  * to query tablet for this missing information instead of hard coding in
 403  * an additional table.
 404  *
 405  * A typical Interface Descriptor for a stylus will contain a
 406  * boot mouse application collection that is not of interest and this
 407  * function will ignore it.
 408  *
 409  * It also contains a digitizer application collection that also is not
 410  * of interest since any information it contains would be duplicate
 411  * of what is in wacom_features. Usually it defines a report of an array
 412  * of bytes that could be used as max length of the stylus packet returned.
 413  * If it happens to define a Digitizer-Stylus Physical Collection then
 414  * the X and Y logical values contain valid data but it is ignored.
 415  *
 416  * A typical Interface Descriptor for a touch interface will contain a
 417  * Digitizer-Finger Physical Collection which will define both logical
 418  * X/Y maximum as well as the physical size of tablet. Since touch
 419  * interfaces haven't supported pressure or distance, this is enough
 420  * information to override invalid values in the wacom_features table.
 421  *
 422  * Intuos5 touch interface and 3rd gen Bamboo Touch do not contain useful
 423  * data. We deal with them after returning from this function.
 424  */
 425 static void wacom_usage_mapping(struct hid_device *hdev,
 426                 struct hid_field *field, struct hid_usage *usage)
 427 {
 428         struct wacom *wacom = hid_get_drvdata(hdev);
 429         struct wacom_features *features = &wacom->wacom_wac.features;
 430         bool finger = WACOM_FINGER_FIELD(field);
 431         bool pen = WACOM_PEN_FIELD(field);
 432         unsigned equivalent_usage = wacom_equivalent_usage(usage->hid);
 433
 434         /*
 435         * Requiring Stylus Usage will ignore boot mouse
 436         * X/Y values and some cases of invalid Digitizer X/Y
 437         * values commonly reported.
 438         */
 439         if (pen)
 440                 features->device_type |= WACOM_DEVICETYPE_PEN;
 441         else if (finger)
 442                 features->device_type |= WACOM_DEVICETYPE_TOUCH;
 443         else
 444                 return;
 445
 446         wacom_hid_usage_quirk(hdev, field, usage);
 447
 448         switch (equivalent_usage) {
 449         case HID_GD_X:
 450                 features->x_max = field->logical_maximum;
 451                 if (finger) {
 452                         features->x_phy = field->physical_maximum;
 453                         if ((features->type != BAMBOO_PT) &&
 454                             (features->type != BAMBOO_TOUCH)) {
 455                                 features->unit = field->unit;
 456                                 features->unitExpo = field->unit_exponent;
 457                         }
 458                 }
 459                 break;
 460         case HID_GD_Y:
 461                 features->y_max = field->logical_maximum;
 462                 if (finger) {
 463                         features->y_phy = field->physical_maximum;
 464                         if ((features->type != BAMBOO_PT) &&
 465                             (features->type != BAMBOO_TOUCH)) {
 466                                 features->unit = field->unit;
 467                                 features->unitExpo = field->unit_exponent;
 468                         }
 469                 }
 470                 break;
 471         case HID_DG_TIPPRESSURE:
 472                 if (pen)
 473                         features->pressure_max = field->logical_maximum;
 474                 break;
 475         }
 476
 477         if (features->type == HID_GENERIC)
 478                 wacom_wac_usage_mapping(hdev, field, usage);
 479 }
 480
 481 static void wacom_post_parse_hid(struct hid_device *hdev,
 482                                  struct wacom_features *features)
 483 {
 484         struct wacom *wacom = hid_get_drvdata(hdev);
 485         struct wacom_wac *wacom_wac = &wacom->wacom_wac;
 486
 487         if (features->type == HID_GENERIC) {
 488                 /* Any last-minute generic device setup */
 489                 if (wacom_wac->has_mode_change) {
 490                         if (wacom_wac->is_direct_mode)
 491                                 features->device_type |= WACOM_DEVICETYPE_DIRECT;
 492                         else
 493                                 features->device_type &= ~WACOM_DEVICETYPE_DIRECT;
 494                 }
 495
 496                 if (features->touch_max > 1) {
 497                         if (features->device_type & WACOM_DEVICETYPE_DIRECT)
 498                                 input_mt_init_slots(wacom_wac->touch_input,
 499                                                     wacom_wac->features.touch_max,
 500                                                     INPUT_MT_DIRECT);
 501                         else
 502                                 input_mt_init_slots(wacom_wac->touch_input,
 503                                                     wacom_wac->features.touch_max,
 504                                                     INPUT_MT_POINTER);
 505                 }
 506         }
 507 }
 508
 509 static void wacom_parse_hid(struct hid_device *hdev,
 510                            struct wacom_features *features)
 511 {
 512         struct hid_report_enum *rep_enum;
 513         struct hid_report *hreport;
 514         int i, j;
 515
 516         /* check features first */
 517         rep_enum = &hdev->report_enum[HID_FEATURE_REPORT];
 518         list_for_each_entry(hreport, &rep_enum->report_list, list) {
 519                 for (i = 0; i < hreport->maxfield; i++) {
 520                         /* Ignore if report count is out of bounds. */
 521                         if (hreport->field[i]->report_count < 1)
 522                                 continue;
 523
 524                         for (j = 0; j < hreport->field[i]->maxusage; j++) {
 525                                 wacom_feature_mapping(hdev, hreport->field[i],
 526                                                 hreport->field[i]->usage + j);
 527                         }
 528                 }
 529         }
 530
 531         /* now check the input usages */
 532         rep_enum = &hdev->report_enum[HID_INPUT_REPORT];
 533         list_for_each_entry(hreport, &rep_enum->report_list, list) {
 534
 535                 if (!hreport->maxfield)
 536                         continue;
 537
 538                 for (i = 0; i < hreport->maxfield; i++)
 539                         for (j = 0; j < hreport->field[i]->maxusage; j++)
 540                                 wacom_usage_mapping(hdev, hreport->field[i],
 541                                                 hreport->field[i]->usage + j);
 542         }
 543
 544         wacom_post_parse_hid(hdev, features);
 545 }
 546
 547 static int wacom_hid_set_device_mode(struct hid_device *hdev)
 548 {
 549         struct wacom *wacom = hid_get_drvdata(hdev);
 550         struct hid_data *hid_data = &wacom->wacom_wac.hid_data;
 551         struct hid_report *r;
 552         struct hid_report_enum *re;
 553
 554         if (hid_data->inputmode < 0)
 555                 return 0;
 556
 557         re = &(hdev->report_enum[HID_FEATURE_REPORT]);
 558         r = re->report_id_hash[hid_data->inputmode];
 559         if (r) {
 560                 r->field[0]->value[hid_data->inputmode_index] = 2;
 561                 hid_hw_request(hdev, r, HID_REQ_SET_REPORT);
 562         }
 563         return 0;
 564 }
 565
 566 static int wacom_set_device_mode(struct hid_device *hdev,
 567                                  struct wacom_wac *wacom_wac)
 568 {
 569         u8 *rep_data;
 570         struct hid_report *r;
 571         struct hid_report_enum *re;
 572         u32 length;
 573         int error = -ENOMEM, limit = 0;
 574
 575         if (wacom_wac->mode_report < 0)
 576                 return 0;
 577
 578         re = &(hdev->report_enum[HID_FEATURE_REPORT]);
 579         r = re->report_id_hash[wacom_wac->mode_report];
 580         if (!r)
 581                 return -EINVAL;
 582
 583         rep_data = hid_alloc_report_buf(r, GFP_KERNEL);
 584         if (!rep_data)
 585                 return -ENOMEM;
 586
 587         length = hid_report_len(r);
 588
 589         do {
 590                 rep_data[0] = wacom_wac->mode_report;
 591                 rep_data[1] = wacom_wac->mode_value;
 592
 593                 error = wacom_set_report(hdev, HID_FEATURE_REPORT, rep_data,
 594                                          length, 1);
 595                 if (error >= 0)
 596                         error = wacom_get_report(hdev, HID_FEATURE_REPORT,
 597                                                  rep_data, length, 1);
 598         } while (error >= 0 &&
 599                  rep_data[1] != wacom_wac->mode_report &&
 600                  limit++ < WAC_MSG_RETRIES);
 601
 602         kfree(rep_data);
 603
 604         return error < 0 ? error : 0;
 605 }
 606
 607 static int wacom_bt_query_tablet_data(struct hid_device *hdev, u8 speed,
 608                 struct wacom_features *features)
 609 {
 610         struct wacom *wacom = hid_get_drvdata(hdev);
 611         int ret;
 612         u8 rep_data[2];
 613
 614         switch (features->type) {
 615         case GRAPHIRE_BT:
 616                 rep_data[0] = 0x03;
 617                 rep_data[1] = 0x00;
 618                 ret = wacom_set_report(hdev, HID_FEATURE_REPORT, rep_data, 2,
 619                                         3);
 620
 621                 if (ret >= 0) {
 622                         rep_data[0] = speed == 0 ? 0x05 : 0x06;
 623                         rep_data[1] = 0x00;
 624
 625                         ret = wacom_set_report(hdev, HID_FEATURE_REPORT,
 626                                                 rep_data, 2, 3);
 627
 628                         if (ret >= 0) {
 629                                 wacom->wacom_wac.bt_high_speed = speed;
 630                                 return 0;
 631                         }
 632                 }
 633
 634                 /*
 635                  * Note that if the raw queries fail, it's not a hard failure
 636                  * and it is safe to continue
 637                  */
 638                 hid_warn(hdev, "failed to poke device, command %d, err %d\n",
 639                          rep_data[0], ret);
 640                 break;
 641         case INTUOS4WL:
 642                 if (speed == 1)
 643                         wacom->wacom_wac.bt_features &= ~0x20;
 644                 else
 645                         wacom->wacom_wac.bt_features |= 0x20;
 646
 647                 rep_data[0] = 0x03;
 648                 rep_data[1] = wacom->wacom_wac.bt_features;
 649
 650                 ret = wacom_set_report(hdev, HID_FEATURE_REPORT, rep_data, 2,
 651                                         1);
 652                 if (ret >= 0)
 653                         wacom->wacom_wac.bt_high_speed = speed;
 654                 break;
 655         }
 656
 657         return 0;
 658 }
 659
 660 /*
 661  * Switch the tablet into its most-capable mode. Wacom tablets are
 662  * typically configured to power-up in a mode which sends mouse-like
 663  * reports to the OS. To get absolute position, pressure data, etc.
 664  * from the tablet, it is necessary to switch the tablet out of this
 665  * mode and into one which sends the full range of tablet data.
 666  */
 667 static int _wacom_query_tablet_data(struct wacom *wacom)
 668 {
 669         struct hid_device *hdev = wacom->hdev;
 670         struct wacom_wac *wacom_wac = &wacom->wacom_wac;
 671         struct wacom_features *features = &wacom_wac->features;
 672
 673         if (hdev->bus == BUS_BLUETOOTH)
 674                 return wacom_bt_query_tablet_data(hdev, 1, features);
 675
 676         if (features->type != HID_GENERIC) {
 677                 if (features->device_type & WACOM_DEVICETYPE_TOUCH) {
 678                         if (features->type > TABLETPC) {
 679                                 /* MT Tablet PC touch */
 680                                 wacom_wac->mode_report = 3;
 681                                 wacom_wac->mode_value = 4;
 682                         } else if (features->type == WACOM_24HDT) {
 683                                 wacom_wac->mode_report = 18;
 684                                 wacom_wac->mode_value = 2;
 685                         } else if (features->type == WACOM_27QHDT) {
 686                                 wacom_wac->mode_report = 131;
 687                                 wacom_wac->mode_value = 2;
 688                         } else if (features->type == BAMBOO_PAD) {
 689                                 wacom_wac->mode_report = 2;
 690                                 wacom_wac->mode_value = 2;
 691                         }
 692                 } else if (features->device_type & WACOM_DEVICETYPE_PEN) {
 693                         if (features->type <= BAMBOO_PT) {
 694                                 wacom_wac->mode_report = 2;
 695                                 wacom_wac->mode_value = 2;
 696                         }
 697                 }
 698         }
 699
 700         wacom_set_device_mode(hdev, wacom_wac);
 701
 702         if (features->type == HID_GENERIC)
 703                 return wacom_hid_set_device_mode(hdev);
 704
 705         return 0;
 706 }
 707
 708 static void wacom_retrieve_hid_descriptor(struct hid_device *hdev,
 709                                          struct wacom_features *features)
 710 {
 711         struct wacom *wacom = hid_get_drvdata(hdev);
 712         struct usb_interface *intf = wacom->intf;
 713
 714         /* default features */
 715         features->x_fuzz = 4;
 716         features->y_fuzz = 4;
 717         features->pressure_fuzz = 0;
 718         features->distance_fuzz = 1;
 719         features->tilt_fuzz = 1;
 720
 721         /*
 722          * The wireless device HID is basic and layout conflicts with
 723          * other tablets (monitor and touch interface can look like pen).
 724          * Skip the query for this type and modify defaults based on
 725          * interface number.
 726          */
 727         if (features->type == WIRELESS && intf) {
 728                 if (intf->cur_altsetting->desc.bInterfaceNumber == 0)
 729                         features->device_type = WACOM_DEVICETYPE_WL_MONITOR;
 730                 else
 731                         features->device_type = WACOM_DEVICETYPE_NONE;
 732                 return;
 733         }
 734
 735         wacom_parse_hid(hdev, features);
 736 }
 737
 738 struct wacom_hdev_data {
 739         struct list_head list;
 740         struct kref kref;
 741         struct hid_device *dev;
 742         struct wacom_shared shared;
 743 };
 744
 745 static LIST_HEAD(wacom_udev_list);
 746 static DEFINE_MUTEX(wacom_udev_list_lock);
 747
 748 static bool wacom_are_sibling(struct hid_device *hdev,
 749                 struct hid_device *sibling)
 750 {
 751         struct wacom *wacom = hid_get_drvdata(hdev);
 752         struct wacom_features *features = &wacom->wacom_wac.features;
 753         struct wacom *sibling_wacom = hid_get_drvdata(sibling);
 754         struct wacom_features *sibling_features = &sibling_wacom->wacom_wac.features;
 755         __u32 oVid = features->oVid ? features->oVid : hdev->vendor;
 756         __u32 oPid = features->oPid ? features->oPid : hdev->product;
 757
 758         /* The defined oVid/oPid must match that of the sibling */
 759         if (features->oVid != HID_ANY_ID && sibling->vendor != oVid)
 760                 return false;
 761         if (features->oPid != HID_ANY_ID && sibling->product != oPid)
 762                 return false;
 763
 764         /*
 765          * Devices with the same VID/PID must share the same physical
 766          * device path, while those with different VID/PID must share
 767          * the same physical parent device path.
 768          */
 769         if (hdev->vendor == sibling->vendor && hdev->product == sibling->product) {
 770                 if (!hid_compare_device_paths(hdev, sibling, '/'))
 771                         return false;
 772         } else {
 773                 if (!hid_compare_device_paths(hdev, sibling, '.'))
 774                         return false;
 775         }
 776
 777         /* Skip the remaining heuristics unless you are a HID_GENERIC device */
 778         if (features->type != HID_GENERIC)
 779                 return true;
 780
 781         /*
 782          * Direct-input devices may not be siblings of indirect-input
 783          * devices.
 784          */
 785         if ((features->device_type & WACOM_DEVICETYPE_DIRECT) &&
 786             !(sibling_features->device_type & WACOM_DEVICETYPE_DIRECT))
 787                 return false;
 788
 789         /*
 790          * Indirect-input devices may not be siblings of direct-input
 791          * devices.
 792          */
 793         if (!(features->device_type & WACOM_DEVICETYPE_DIRECT) &&
 794             (sibling_features->device_type & WACOM_DEVICETYPE_DIRECT))
 795                 return false;
 796
 797         /* Pen devices may only be siblings of touch devices */
 798         if ((features->device_type & WACOM_DEVICETYPE_PEN) &&
 799             !(sibling_features->device_type & WACOM_DEVICETYPE_TOUCH))
 800                 return false;
 801
 802         /* Touch devices may only be siblings of pen devices */
 803         if ((features->device_type & WACOM_DEVICETYPE_TOUCH) &&
 804             !(sibling_features->device_type & WACOM_DEVICETYPE_PEN))
 805                 return false;
 806
 807         /*
 808          * No reason could be found for these two devices to NOT be
 809          * siblings, so there's a good chance they ARE siblings
 810          */
 811         return true;
 812 }
 813
 814 static struct wacom_hdev_data *wacom_get_hdev_data(struct hid_device *hdev)
 815 {
 816         struct wacom_hdev_data *data;
 817
 818         /* Try to find an already-probed interface from the same device */
 819         list_for_each_entry(data, &wacom_udev_list, list) {
 820                 if (hid_compare_device_paths(hdev, data->dev, '/')) {
 821                         kref_get(&data->kref);
 822                         return data;
 823                 }
 824         }
 825
 826         /* Fallback to finding devices that appear to be "siblings" */
 827         list_for_each_entry(data, &wacom_udev_list, list) {
 828                 if (wacom_are_sibling(hdev, data->dev)) {
 829                         kref_get(&data->kref);
 830                         return data;
 831                 }
 832         }
 833
 834         return NULL;
 835 }
 836
 837 static void wacom_release_shared_data(struct kref *kref)
 838 {
 839         struct wacom_hdev_data *data =
 840                 container_of(kref, struct wacom_hdev_data, kref);
 841
 842         mutex_lock(&wacom_udev_list_lock);
 843         list_del(&data->list);
 844         mutex_unlock(&wacom_udev_list_lock);
 845
 846         kfree(data);
 847 }
 848
 849 static void wacom_remove_shared_data(void *res)
 850 {
 851         struct wacom *wacom = res;
 852         struct wacom_hdev_data *data;
 853         struct wacom_wac *wacom_wac = &wacom->wacom_wac;
 854
 855         if (wacom_wac->shared) {
 856                 data = container_of(wacom_wac->shared, struct wacom_hdev_data,
 857                                     shared);
 858
 859                 if (wacom_wac->shared->touch == wacom->hdev)
 860                         wacom_wac->shared->touch = NULL;
 861                 else if (wacom_wac->shared->pen == wacom->hdev)
 862                         wacom_wac->shared->pen = NULL;
 863
 864                 kref_put(&data->kref, wacom_release_shared_data);
 865                 wacom_wac->shared = NULL;
 866         }
 867 }
 868
 869 static int wacom_add_shared_data(struct hid_device *hdev)
 870 {
 871         struct wacom *wacom = hid_get_drvdata(hdev);
 872         struct wacom_wac *wacom_wac = &wacom->wacom_wac;
 873         struct wacom_hdev_data *data;
 874         int retval = 0;
 875
 876         mutex_lock(&wacom_udev_list_lock);
 877
 878         data = wacom_get_hdev_data(hdev);
 879         if (!data) {
 880                 data = kzalloc(sizeof(struct wacom_hdev_data), GFP_KERNEL);
 881                 if (!data) {
 882                         mutex_unlock(&wacom_udev_list_lock);
 883                         return -ENOMEM;
 884                 }
 885
 886                 kref_init(&data->kref);
 887                 data->dev = hdev;
 888                 list_add_tail(&data->list, &wacom_udev_list);
 889         }
 890
 891         mutex_unlock(&wacom_udev_list_lock);
 892
 893         wacom_wac->shared = &data->shared;
 894
 895         retval = devm_add_action_or_reset(&hdev->dev, wacom_remove_shared_data, wacom);
 896         if (retval)
 897                 return retval;
 898
 899         if (wacom_wac->features.device_type & WACOM_DEVICETYPE_TOUCH)
 900                 wacom_wac->shared->touch = hdev;
 901         else if (wacom_wac->features.device_type & WACOM_DEVICETYPE_PEN)
 902                 wacom_wac->shared->pen = hdev;
 903
 904         return retval;
 905 }
 906
 907 static int wacom_led_control(struct wacom *wacom)
 908 {
 909         unsigned char *buf;
 910         int retval;
 911         unsigned char report_id = WAC_CMD_LED_CONTROL;
 912         int buf_size = 9;
 913
 914         if (!wacom->led.groups)
 915                 return -ENOTSUPP;
 916
 917         if (wacom->wacom_wac.features.type == REMOTE)
 918                 return -ENOTSUPP;
 919
 920         if (wacom->wacom_wac.pid) { /* wireless connected */
 921                 report_id = WAC_CMD_WL_LED_CONTROL;
 922                 buf_size = 13;
 923         }
 924         else if (wacom->wacom_wac.features.type == INTUOSP2_BT) {
 925                 report_id = WAC_CMD_WL_INTUOSP2;
 926                 buf_size = 51;
 927         }
 928         buf = kzalloc(buf_size, GFP_KERNEL);
 929         if (!buf)
 930                 return -ENOMEM;
 931
 932         if (wacom->wacom_wac.features.type == HID_GENERIC) {
 933                 buf[0] = WAC_CMD_LED_CONTROL_GENERIC;
 934                 buf[1] = wacom->led.llv;
 935                 buf[2] = wacom->led.groups[0].select & 0x03;
 936
 937         } else if ((wacom->wacom_wac.features.type >= INTUOS5S &&
 938             wacom->wacom_wac.features.type <= INTUOSPL)) {
 939                 /*
 940                  * Touch Ring and crop mark LED luminance may take on
 941                  * one of four values:
 942                  *    0 = Low; 1 = Medium; 2 = High; 3 = Off
 943                  */
 944                 int ring_led = wacom->led.groups[0].select & 0x03;
 945                 int ring_lum = (((wacom->led.llv & 0x60) >> 5) - 1) & 0x03;
 946                 int crop_lum = 0;
 947                 unsigned char led_bits = (crop_lum << 4) | (ring_lum << 2) | (ring_led);
 948
 949                 buf[0] = report_id;
 950                 if (wacom->wacom_wac.pid) {
 951                         wacom_get_report(wacom->hdev, HID_FEATURE_REPORT,
 952                                          buf, buf_size, WAC_CMD_RETRIES);
 953                         buf[0] = report_id;
 954                         buf[4] = led_bits;
 955                 } else
 956                         buf[1] = led_bits;
 957         }
 958         else if (wacom->wacom_wac.features.type == INTUOSP2_BT) {
 959                 buf[0] = report_id;
 960                 buf[4] = 100; // Power Connection LED (ORANGE)
 961                 buf[5] = 100; // BT Connection LED (BLUE)
 962                 buf[6] = 100; // Paper Mode (RED?)
 963                 buf[7] = 100; // Paper Mode (GREEN?)
 964                 buf[8] = 100; // Paper Mode (BLUE?)
 965                 buf[9] = wacom->led.llv;
 966                 buf[10] = wacom->led.groups[0].select & 0x03;
 967         }
 968         else {
 969                 int led = wacom->led.groups[0].select | 0x4;
 970
 971                 if (wacom->wacom_wac.features.type == WACOM_21UX2 ||
 972                     wacom->wacom_wac.features.type == WACOM_24HD)
 973                         led |= (wacom->led.groups[1].select << 4) | 0x40;
 974
 975                 buf[0] = report_id;
 976                 buf[1] = led;
 977                 buf[2] = wacom->led.llv;
 978                 buf[3] = wacom->led.hlv;
 979                 buf[4] = wacom->led.img_lum;
 980         }
 981
 982         retval = wacom_set_report(wacom->hdev, HID_FEATURE_REPORT, buf, buf_size,
 983                                   WAC_CMD_RETRIES);
 984         kfree(buf);
 985
 986         return retval;
 987 }
 988
 989 static int wacom_led_putimage(struct wacom *wacom, int button_id, u8 xfer_id,
 990                 const unsigned len, const void *img)
 991 {
 992         unsigned char *buf;
 993         int i, retval;
 994         const unsigned chunk_len = len / 4; /* 4 chunks are needed to be sent */
 995
 996         buf = kzalloc(chunk_len + 3 , GFP_KERNEL);
 997         if (!buf)
 998                 return -ENOMEM;
 999
1000         /* Send 'start' command */
1001         buf[0] = WAC_CMD_ICON_START;
1002         buf[1] = 1;
1003         retval = wacom_set_report(wacom->hdev, HID_FEATURE_REPORT, buf, 2,
1004                                   WAC_CMD_RETRIES);
1005         if (retval < 0)
1006                 goto out;
1007
1008         buf[0] = xfer_id;
1009         buf[1] = button_id & 0x07;
1010         for (i = 0; i < 4; i++) {
1011                 buf[2] = i;
1012                 memcpy(buf + 3, img + i * chunk_len, chunk_len);
1013
1014                 retval = wacom_set_report(wacom->hdev, HID_FEATURE_REPORT,
1015                                           buf, chunk_len + 3, WAC_CMD_RETRIES);
1016                 if (retval < 0)
1017                         break;
1018         }
1019
1020         /* Send 'stop' */
1021         buf[0] = WAC_CMD_ICON_START;
1022         buf[1] = 0;
1023         wacom_set_report(wacom->hdev, HID_FEATURE_REPORT, buf, 2,
1024                          WAC_CMD_RETRIES);
1025
1026 out:
1027         kfree(buf);
1028         return retval;
1029 }
1030
1031 static ssize_t wacom_led_select_store(struct device *dev, int set_id,
1032                                       const char *buf, size_t count)
1033 {
1034         struct hid_device *hdev = to_hid_device(dev);
1035         struct wacom *wacom = hid_get_drvdata(hdev);
1036         unsigned int id;
1037         int err;
1038
1039         err = kstrtouint(buf, 10, &id);
1040         if (err)
1041                 return err;
1042
1043         mutex_lock(&wacom->lock);
1044
1045         wacom->led.groups[set_id].select = id & 0x3;
1046         err = wacom_led_control(wacom);
1047
1048         mutex_unlock(&wacom->lock);
1049
1050         return err < 0 ? err : count;
1051 }
1052
1053 #define DEVICE_LED_SELECT_ATTR(SET_ID)                                  \
1054 static ssize_t wacom_led##SET_ID##_select_store(struct device *dev,     \
1055         struct device_attribute *attr, const char *buf, size_t count)   \
1056 {                                                                       \
1057         return wacom_led_select_store(dev, SET_ID, buf, count);         \
1058 }                                                                       \
1059 static ssize_t wacom_led##SET_ID##_select_show(struct device *dev,      \
1060         struct device_attribute *attr, char *buf)                       \
1061 {                                                                       \
1062         struct hid_device *hdev = to_hid_device(dev);\
1063         struct wacom *wacom = hid_get_drvdata(hdev);                    \
1064         return scnprintf(buf, PAGE_SIZE, "%d\n",                        \
1065                          wacom->led.groups[SET_ID].select);             \
1066 }                                                                       \
1067 static DEVICE_ATTR(status_led##SET_ID##_select, DEV_ATTR_RW_PERM,       \
1068                     wacom_led##SET_ID##_select_show,                    \
1069                     wacom_led##SET_ID##_select_store)
1070
1071 DEVICE_LED_SELECT_ATTR(0);
1072 DEVICE_LED_SELECT_ATTR(1);
1073
1074 static ssize_t wacom_luminance_store(struct wacom *wacom, u8 *dest,
1075                                      const char *buf, size_t count)
1076 {
1077         unsigned int value;
1078         int err;
1079
1080         err = kstrtouint(buf, 10, &value);
1081         if (err)
1082                 return err;
1083
1084         mutex_lock(&wacom->lock);
1085
1086         *dest = value & 0x7f;
1087         err = wacom_led_control(wacom);
1088
1089         mutex_unlock(&wacom->lock);
1090
1091         return err < 0 ? err : count;
1092 }
1093
1094 #define DEVICE_LUMINANCE_ATTR(name, field)                              \
1095 static ssize_t wacom_##name##_luminance_store(struct device *dev,       \
1096         struct device_attribute *attr, const char *buf, size_t count)   \
1097 {                                                                       \
1098         struct hid_device *hdev = to_hid_device(dev);\
1099         struct wacom *wacom = hid_get_drvdata(hdev);                    \
1100                                                                         \
1101         return wacom_luminance_store(wacom, &wacom->led.field,          \
1102                                      buf, count);                       \
1103 }                                                                       \
1104 static ssize_t wacom_##name##_luminance_show(struct device *dev,        \
1105         struct device_attribute *attr, char *buf)                       \
1106 {                                                                       \
1107         struct wacom *wacom = dev_get_drvdata(dev);                     \
1108         return scnprintf(buf, PAGE_SIZE, "%d\n", wacom->led.field);     \
1109 }                                                                       \
1110 static DEVICE_ATTR(name##_luminance, DEV_ATTR_RW_PERM,                  \
1111                    wacom_##name##_luminance_show,                       \
1112                    wacom_##name##_luminance_store)
1113
1114 DEVICE_LUMINANCE_ATTR(status0, llv);
1115 DEVICE_LUMINANCE_ATTR(status1, hlv);
1116 DEVICE_LUMINANCE_ATTR(buttons, img_lum);
1117
1118 static ssize_t wacom_button_image_store(struct device *dev, int button_id,
1119                                         const char *buf, size_t count)
1120 {
1121         struct hid_device *hdev = to_hid_device(dev);
1122         struct wacom *wacom = hid_get_drvdata(hdev);
1123         int err;
1124         unsigned len;
1125         u8 xfer_id;
1126
1127         if (hdev->bus == BUS_BLUETOOTH) {
1128                 len = 256;
1129                 xfer_id = WAC_CMD_ICON_BT_XFER;
1130         } else {
1131                 len = 1024;
1132                 xfer_id = WAC_CMD_ICON_XFER;
1133         }
1134
1135         if (count != len)
1136                 return -EINVAL;
1137
1138         mutex_lock(&wacom->lock);
1139
1140         err = wacom_led_putimage(wacom, button_id, xfer_id, len, buf);
1141
1142         mutex_unlock(&wacom->lock);
1143
1144         return err < 0 ? err : count;
1145 }
1146
1147 #define DEVICE_BTNIMG_ATTR(BUTTON_ID)                                   \
1148 static ssize_t wacom_btnimg##BUTTON_ID##_store(struct device *dev,      \
1149         struct device_attribute *attr, const char *buf, size_t count)   \
1150 {                                                                       \
1151         return wacom_button_image_store(dev, BUTTON_ID, buf, count);    \
1152 }                                                                       \
1153 static DEVICE_ATTR(button##BUTTON_ID##_rawimg, DEV_ATTR_WO_PERM,        \
1154                    NULL, wacom_btnimg##BUTTON_ID##_store)
1155
1156 DEVICE_BTNIMG_ATTR(0);
1157 DEVICE_BTNIMG_ATTR(1);
1158 DEVICE_BTNIMG_ATTR(2);
1159 DEVICE_BTNIMG_ATTR(3);
1160 DEVICE_BTNIMG_ATTR(4);
1161 DEVICE_BTNIMG_ATTR(5);
1162 DEVICE_BTNIMG_ATTR(6);
1163 DEVICE_BTNIMG_ATTR(7);
1164
1165 static struct attribute *cintiq_led_attrs[] = {
1166         &dev_attr_status_led0_select.attr,
1167         &dev_attr_status_led1_select.attr,
1168         NULL
1169 };
1170
1171 static const struct attribute_group cintiq_led_attr_group = {
1172         .name = "wacom_led",
1173         .attrs = cintiq_led_attrs,
1174 };
1175
1176 static struct attribute *intuos4_led_attrs[] = {
1177         &dev_attr_status0_luminance.attr,
1178         &dev_attr_status1_luminance.attr,
1179         &dev_attr_status_led0_select.attr,
1180         &dev_attr_buttons_luminance.attr,
1181         &dev_attr_button0_rawimg.attr,
1182         &dev_attr_button1_rawimg.attr,
1183         &dev_attr_button2_rawimg.attr,
1184         &dev_attr_button3_rawimg.attr,
1185         &dev_attr_button4_rawimg.attr,
1186         &dev_attr_button5_rawimg.attr,
1187         &dev_attr_button6_rawimg.attr,
1188         &dev_attr_button7_rawimg.attr,
1189         NULL
1190 };
1191
1192 static const struct attribute_group intuos4_led_attr_group = {
1193         .name = "wacom_led",
1194         .attrs = intuos4_led_attrs,
1195 };
1196
1197 static struct attribute *intuos5_led_attrs[] = {
1198         &dev_attr_status0_luminance.attr,
1199         &dev_attr_status_led0_select.attr,
1200         NULL
1201 };
1202
1203 static const struct attribute_group intuos5_led_attr_group = {
1204         .name = "wacom_led",
1205         .attrs = intuos5_led_attrs,
1206 };
1207
1208 static struct attribute *generic_led_attrs[] = {
1209         &dev_attr_status0_luminance.attr,
1210         &dev_attr_status_led0_select.attr,
1211         NULL
1212 };
1213
1214 static const struct attribute_group generic_led_attr_group = {
1215         .name = "wacom_led",
1216         .attrs = generic_led_attrs,
1217 };
1218
1219 struct wacom_sysfs_group_devres {
1220         const struct attribute_group *group;
1221         struct kobject *root;
1222 };
1223
1224 static void wacom_devm_sysfs_group_release(struct device *dev, void *res)
1225 {
1226         struct wacom_sysfs_group_devres *devres = res;
1227         struct kobject *kobj = devres->root;
1228
1229         dev_dbg(dev, "%s: dropping reference to %s\n",
1230                 __func__, devres->group->name);
1231         sysfs_remove_group(kobj, devres->group);
1232 }
1233
1234 static int __wacom_devm_sysfs_create_group(struct wacom *wacom,
1235                                            struct kobject *root,
1236                                            const struct attribute_group *group)
1237 {
1238         struct wacom_sysfs_group_devres *devres;
1239         int error;
1240
1241         devres = devres_alloc(wacom_devm_sysfs_group_release,
1242                               sizeof(struct wacom_sysfs_group_devres),
1243                               GFP_KERNEL);
1244         if (!devres)
1245                 return -ENOMEM;
1246
1247         devres->group = group;
1248         devres->root = root;
1249
1250         error = sysfs_create_group(devres->root, group);
1251         if (error) {
1252                 devres_free(devres);
1253                 return error;
1254         }
1255
1256         devres_add(&wacom->hdev->dev, devres);
1257
1258         return 0;
1259 }
1260
1261 static int wacom_devm_sysfs_create_group(struct wacom *wacom,
1262                                          const struct attribute_group *group)
1263 {
1264         return __wacom_devm_sysfs_create_group(wacom, &wacom->hdev->dev.kobj,
1265                                                group);
1266 }
1267
1268 static void wacom_devm_kfifo_release(struct device *dev, void *res)
1269 {
1270         struct kfifo_rec_ptr_2 *devres = res;
1271
1272         kfifo_free(devres);
1273 }
1274
1275 static int wacom_devm_kfifo_alloc(struct wacom *wacom)
1276 {
1277         struct wacom_wac *wacom_wac = &wacom->wacom_wac;
1278         struct kfifo_rec_ptr_2 *pen_fifo;
1279         int error;
1280
1281         pen_fifo = devres_alloc(wacom_devm_kfifo_release,
1282                               sizeof(struct kfifo_rec_ptr_2),
1283                               GFP_KERNEL);
1284
1285         if (!pen_fifo)
1286                 return -ENOMEM;
1287
1288         error = kfifo_alloc(pen_fifo, WACOM_PKGLEN_MAX, GFP_KERNEL);
1289         if (error) {
1290                 devres_free(pen_fifo);
1291                 return error;
1292         }
1293
1294         devres_add(&wacom->hdev->dev, pen_fifo);
1295         wacom_wac->pen_fifo = pen_fifo;
1296
1297         return 0;
1298 }
1299
1300 enum led_brightness wacom_leds_brightness_get(struct wacom_led *led)
1301 {
1302         struct wacom *wacom = led->wacom;
1303
1304         if (wacom->led.max_hlv)
1305                 return led->hlv * LED_FULL / wacom->led.max_hlv;
1306
1307         if (wacom->led.max_llv)
1308                 return led->llv * LED_FULL / wacom->led.max_llv;
1309
1310         /* device doesn't support brightness tuning */
1311         return LED_FULL;
1312 }
1313
1314 static enum led_brightness __wacom_led_brightness_get(struct led_classdev *cdev)
1315 {
1316         struct wacom_led *led = container_of(cdev, struct wacom_led, cdev);
1317         struct wacom *wacom = led->wacom;
1318
1319         if (wacom->led.groups[led->group].select != led->id)
1320                 return LED_OFF;
1321
1322         return wacom_leds_brightness_get(led);
1323 }
1324
1325 static int wacom_led_brightness_set(struct led_classdev *cdev,
1326                                     enum led_brightness brightness)
1327 {
1328         struct wacom_led *led = container_of(cdev, struct wacom_led, cdev);
1329         struct wacom *wacom = led->wacom;
1330         int error;
1331
1332         mutex_lock(&wacom->lock);
1333
1334         if (!wacom->led.groups || (brightness == LED_OFF &&
1335             wacom->led.groups[led->group].select != led->id)) {
1336                 error = 0;
1337                 goto out;
1338         }
1339
1340         led->llv = wacom->led.llv = wacom->led.max_llv * brightness / LED_FULL;
1341         led->hlv = wacom->led.hlv = wacom->led.max_hlv * brightness / LED_FULL;
1342
1343         wacom->led.groups[led->group].select = led->id;
1344
1345         error = wacom_led_control(wacom);
1346
1347 out:
1348         mutex_unlock(&wacom->lock);
1349
1350         return error;
1351 }
1352
1353 static void wacom_led_readonly_brightness_set(struct led_classdev *cdev,
1354                                                enum led_brightness brightness)
1355 {
1356 }
1357
1358 static int wacom_led_register_one(struct device *dev, struct wacom *wacom,
1359                                   struct wacom_led *led, unsigned int group,
1360                                   unsigned int id, bool read_only)
1361 {
1362         int error;
1363         char *name;
1364
1365         name = devm_kasprintf(dev, GFP_KERNEL,
1366                               "%s::wacom-%d.%d",
1367                               dev_name(dev),
1368                               group,
1369                               id);
1370         if (!name)
1371                 return -ENOMEM;
1372
1373         if (!read_only) {
1374                 led->trigger.name = name;
1375                 error = devm_led_trigger_register(dev, &led->trigger);
1376                 if (error) {
1377                         hid_err(wacom->hdev,
1378                                 "failed to register LED trigger %s: %d\n",
1379                                 led->cdev.name, error);
1380                         return error;
1381                 }
1382         }
1383
1384         led->group = group;
1385         led->id = id;
1386         led->wacom = wacom;
1387         led->llv = wacom->led.llv;
1388         led->hlv = wacom->led.hlv;
1389         led->cdev.name = name;
1390         led->cdev.max_brightness = LED_FULL;
1391         led->cdev.flags = LED_HW_PLUGGABLE;
1392         led->cdev.brightness_get = __wacom_led_brightness_get;
1393         if (!read_only) {
1394                 led->cdev.brightness_set_blocking = wacom_led_brightness_set;
1395                 led->cdev.default_trigger = led->cdev.name;
1396         } else {
1397                 led->cdev.brightness_set = wacom_led_readonly_brightness_set;
1398         }
1399
1400         error = devm_led_classdev_register(dev, &led->cdev);
1401         if (error) {
1402                 hid_err(wacom->hdev,
1403                         "failed to register LED %s: %d\n",
1404                         led->cdev.name, error);
1405                 led->cdev.name = NULL;
1406                 return error;
1407         }
1408
1409         return 0;
1410 }
1411
1412 static void wacom_led_groups_release_one(void *data)
1413 {
1414         struct wacom_group_leds *group = data;
1415
1416         devres_release_group(group->dev, group);
1417 }
1418
1419 static int wacom_led_groups_alloc_and_register_one(struct device *dev,
1420                                                    struct wacom *wacom,
1421                                                    int group_id, int count,
1422                                                    bool read_only)
1423 {
1424         struct wacom_led *leds;
1425         int i, error;
1426
1427         if (group_id >= wacom->led.count || count <= 0)
1428                 return -EINVAL;
1429
1430         if (!devres_open_group(dev, &wacom->led.groups[group_id], GFP_KERNEL))
1431                 return -ENOMEM;
1432
1433         leds = devm_kcalloc(dev, count, sizeof(struct wacom_led), GFP_KERNEL);
1434         if (!leds) {
1435                 error = -ENOMEM;
1436                 goto err;
1437         }
1438
1439         wacom->led.groups[group_id].leds = leds;
1440         wacom->led.groups[group_id].count = count;
1441
1442         for (i = 0; i < count; i++) {
1443                 error = wacom_led_register_one(dev, wacom, &leds[i],
1444                                                group_id, i, read_only);
1445                 if (error)
1446                         goto err;
1447         }
1448
1449         wacom->led.groups[group_id].dev = dev;
1450
1451         devres_close_group(dev, &wacom->led.groups[group_id]);
1452
1453         /*
1454          * There is a bug (?) in devm_led_classdev_register() in which its
1455          * increments the refcount of the parent. If the parent is an input
1456          * device, that means the ref count never reaches 0 when
1457          * devm_input_device_release() gets called.
1458          * This means that the LEDs are still there after disconnect.
1459          * Manually force the release of the group so that the leds are released
1460          * once we are done using them.
1461          */
1462         error = devm_add_action_or_reset(&wacom->hdev->dev,
1463                                          wacom_led_groups_release_one,
1464                                          &wacom->led.groups[group_id]);
1465         if (error)
1466                 return error;
1467
1468         return 0;
1469
1470 err:
1471         devres_release_group(dev, &wacom->led.groups[group_id]);
1472         return error;
1473 }
1474
1475 struct wacom_led *wacom_led_find(struct wacom *wacom, unsigned int group_id,
1476                                  unsigned int id)
1477 {
1478         struct wacom_group_leds *group;
1479
1480         if (group_id >= wacom->led.count)
1481                 return NULL;
1482
1483         group = &wacom->led.groups[group_id];
1484
1485         if (!group->leds)
1486                 return NULL;
1487
1488         id %= group->count;
1489
1490         return &group->leds[id];
1491 }
1492
1493 /*
1494  * wacom_led_next: gives the next available led with a wacom trigger.
1495  *
1496  * returns the next available struct wacom_led which has its default trigger
1497  * or the current one if none is available.
1498  */
1499 struct wacom_led *wacom_led_next(struct wacom *wacom, struct wacom_led *cur)
1500 {
1501         struct wacom_led *next_led;
1502         int group, next;
1503
1504         if (!wacom || !cur)
1505                 return NULL;
1506
1507         group = cur->group;
1508         next = cur->id;
1509
1510         do {
1511                 next_led = wacom_led_find(wacom, group, ++next);
1512                 if (!next_led || next_led == cur)
1513                         return next_led;
1514         } while (next_led->cdev.trigger != &next_led->trigger);
1515
1516         return next_led;
1517 }
1518
1519 static void wacom_led_groups_release(void *data)
1520 {
1521         struct wacom *wacom = data;
1522
1523         wacom->led.groups = NULL;
1524         wacom->led.count = 0;
1525 }
1526
1527 static int wacom_led_groups_allocate(struct wacom *wacom, int count)
1528 {
1529         struct device *dev = &wacom->hdev->dev;
1530         struct wacom_group_leds *groups;
1531         int error;
1532
1533         groups = devm_kcalloc(dev, count, sizeof(struct wacom_group_leds),
1534                               GFP_KERNEL);
1535         if (!groups)
1536                 return -ENOMEM;
1537
1538         error = devm_add_action_or_reset(dev, wacom_led_groups_release, wacom);
1539         if (error)
1540                 return error;
1541
1542         wacom->led.groups = groups;
1543         wacom->led.count = count;
1544
1545         return 0;
1546 }
1547
1548 static int wacom_leds_alloc_and_register(struct wacom *wacom, int group_count,
1549                                          int led_per_group, bool read_only)
1550 {
1551         struct device *dev;
1552         int i, error;
1553
1554         if (!wacom->wacom_wac.pad_input)
1555                 return -EINVAL;
1556
1557         dev = &wacom->wacom_wac.pad_input->dev;
1558
1559         error = wacom_led_groups_allocate(wacom, group_count);
1560         if (error)
1561                 return error;
1562
1563         for (i = 0; i < group_count; i++) {
1564                 error = wacom_led_groups_alloc_and_register_one(dev, wacom, i,
1565                                                                 led_per_group,
1566                                                                 read_only);
1567                 if (error)
1568                         return error;
1569         }
1570
1571         return 0;
1572 }
1573
1574 int wacom_initialize_leds(struct wacom *wacom)
1575 {
1576         int error;
1577
1578         if (!(wacom->wacom_wac.features.device_type & WACOM_DEVICETYPE_PAD))
1579                 return 0;
1580
1581         /* Initialize default values */
1582         switch (wacom->wacom_wac.features.type) {
1583         case HID_GENERIC:
1584                 if (!wacom->generic_has_leds)
1585                         return 0;
1586                 wacom->led.llv = 100;
1587                 wacom->led.max_llv = 100;
1588
1589                 error = wacom_leds_alloc_and_register(wacom, 1, 4, false);
1590                 if (error) {
1591                         hid_err(wacom->hdev,
1592                                 "cannot create leds err: %d\n", error);
1593                         return error;
1594                 }
1595
1596                 error = wacom_devm_sysfs_create_group(wacom,
1597                                                       &generic_led_attr_group);
1598                 break;
1599
1600         case INTUOS4S:
1601         case INTUOS4:
1602         case INTUOS4WL:
1603         case INTUOS4L:
1604                 wacom->led.llv = 10;
1605                 wacom->led.hlv = 20;
1606                 wacom->led.max_llv = 127;
1607                 wacom->led.max_hlv = 127;
1608                 wacom->led.img_lum = 10;
1609
1610                 error = wacom_leds_alloc_and_register(wacom, 1, 4, false);
1611                 if (error) {
1612                         hid_err(wacom->hdev,
1613                                 "cannot create leds err: %d\n", error);
1614                         return error;
1615                 }
1616
1617                 error = wacom_devm_sysfs_create_group(wacom,
1618                                                       &intuos4_led_attr_group);
1619                 break;
1620
1621         case WACOM_24HD:
1622         case WACOM_21UX2:
1623                 wacom->led.llv = 0;
1624                 wacom->led.hlv = 0;
1625                 wacom->led.img_lum = 0;
1626
1627                 error = wacom_leds_alloc_and_register(wacom, 2, 4, false);
1628                 if (error) {
1629                         hid_err(wacom->hdev,
1630                                 "cannot create leds err: %d\n", error);
1631                         return error;
1632                 }
1633
1634                 error = wacom_devm_sysfs_create_group(wacom,
1635                                                       &cintiq_led_attr_group);
1636                 break;
1637
1638         case INTUOS5S:
1639         case INTUOS5:
1640         case INTUOS5L:
1641         case INTUOSPS:
1642         case INTUOSPM:
1643         case INTUOSPL:
1644                 wacom->led.llv = 32;
1645                 wacom->led.max_llv = 96;
1646
1647                 error = wacom_leds_alloc_and_register(wacom, 1, 4, false);
1648                 if (error) {
1649                         hid_err(wacom->hdev,
1650                                 "cannot create leds err: %d\n", error);
1651                         return error;
1652                 }
1653
1654                 error = wacom_devm_sysfs_create_group(wacom,
1655                                                       &intuos5_led_attr_group);
1656                 break;
1657
1658         case INTUOSP2_BT:
1659                 wacom->led.llv = 50;
1660                 wacom->led.max_llv = 100;
1661                 error = wacom_leds_alloc_and_register(wacom, 1, 4, false);
1662                 if (error) {
1663                         hid_err(wacom->hdev,
1664                                 "cannot create leds err: %d\n", error);
1665                         return error;
1666                 }
1667                 return 0;
1668
1669         case REMOTE:
1670                 wacom->led.llv = 255;
1671                 wacom->led.max_llv = 255;
1672                 error = wacom_led_groups_allocate(wacom, 5);
1673                 if (error) {
1674                         hid_err(wacom->hdev,
1675                                 "cannot create leds err: %d\n", error);
1676                         return error;
1677                 }
1678                 return 0;
1679
1680         default:
1681                 return 0;
1682         }
1683
1684         if (error) {
1685                 hid_err(wacom->hdev,
1686                         "cannot create sysfs group err: %d\n", error);
1687                 return error;
1688         }
1689
1690         return 0;
1691 }
1692
1693 static void wacom_init_work(struct work_struct *work)
1694 {
1695         struct wacom *wacom = container_of(work, struct wacom, init_work.work);
1696
1697         _wacom_query_tablet_data(wacom);
1698         wacom_led_control(wacom);
1699 }
1700
1701 static void wacom_query_tablet_data(struct wacom *wacom)
1702 {
1703         schedule_delayed_work(&wacom->init_work, msecs_to_jiffies(1000));
1704 }
1705
1706 static enum power_supply_property wacom_battery_props[] = {
1707         POWER_SUPPLY_PROP_MODEL_NAME,
1708         POWER_SUPPLY_PROP_PRESENT,
1709         POWER_SUPPLY_PROP_STATUS,
1710         POWER_SUPPLY_PROP_SCOPE,
1711         POWER_SUPPLY_PROP_CAPACITY
1712 };
1713
1714 static int wacom_battery_get_property(struct power_supply *psy,
1715                                       enum power_supply_property psp,
1716                                       union power_supply_propval *val)
1717 {
1718         struct wacom_battery *battery = power_supply_get_drvdata(psy);
1719         int ret = 0;
1720
1721         switch (psp) {
1722                 case POWER_SUPPLY_PROP_MODEL_NAME:
1723                         val->strval = battery->wacom->wacom_wac.name;
1724                         break;
1725                 case POWER_SUPPLY_PROP_PRESENT:
1726                         val->intval = battery->bat_connected;
1727                         break;
1728                 case POWER_SUPPLY_PROP_SCOPE:
1729                         val->intval = POWER_SUPPLY_SCOPE_DEVICE;
1730                         break;
1731                 case POWER_SUPPLY_PROP_CAPACITY:
1732                         val->intval = battery->battery_capacity;
1733                         break;
1734                 case POWER_SUPPLY_PROP_STATUS:
1735                         if (battery->bat_status != WACOM_POWER_SUPPLY_STATUS_AUTO)
1736                                 val->intval = battery->bat_status;
1737                         else if (battery->bat_charging)
1738                                 val->intval = POWER_SUPPLY_STATUS_CHARGING;
1739                         else if (battery->battery_capacity == 100 &&
1740                                     battery->ps_connected)
1741                                 val->intval = POWER_SUPPLY_STATUS_FULL;
1742                         else if (battery->ps_connected)
1743                                 val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING;
1744                         else
1745                                 val->intval = POWER_SUPPLY_STATUS_DISCHARGING;
1746                         break;
1747                 default:
1748                         ret = -EINVAL;
1749                         break;
1750         }
1751
1752         return ret;
1753 }
1754
1755 static int __wacom_initialize_battery(struct wacom *wacom,
1756                                       struct wacom_battery *battery)
1757 {
1758         static atomic_t battery_no = ATOMIC_INIT(0);
1759         struct device *dev = &wacom->hdev->dev;
1760         struct power_supply_config psy_cfg = { .drv_data = battery, };
1761         struct power_supply *ps_bat;
1762         struct power_supply_desc *bat_desc = &battery->bat_desc;
1763         unsigned long n;
1764         int error;
1765
1766         if (!devres_open_group(dev, bat_desc, GFP_KERNEL))
1767                 return -ENOMEM;
1768
1769         battery->wacom = wacom;
1770
1771         n = atomic_inc_return(&battery_no) - 1;
1772
1773         bat_desc->properties = wacom_battery_props;
1774         bat_desc->num_properties = ARRAY_SIZE(wacom_battery_props);
1775         bat_desc->get_property = wacom_battery_get_property;
1776         sprintf(battery->bat_name, "wacom_battery_%ld", n);
1777         bat_desc->name = battery->bat_name;
1778         bat_desc->type = POWER_SUPPLY_TYPE_BATTERY;
1779         bat_desc->use_for_apm = 0;
1780
1781         ps_bat = devm_power_supply_register(dev, bat_desc, &psy_cfg);
1782         if (IS_ERR(ps_bat)) {
1783                 error = PTR_ERR(ps_bat);
1784                 goto err;
1785         }
1786
1787         power_supply_powers(ps_bat, &wacom->hdev->dev);
1788
1789         battery->battery = ps_bat;
1790
1791         devres_close_group(dev, bat_desc);
1792         return 0;
1793
1794 err:
1795         devres_release_group(dev, bat_desc);
1796         return error;
1797 }
1798
1799 static int wacom_initialize_battery(struct wacom *wacom)
1800 {
1801         if (wacom->wacom_wac.features.quirks & WACOM_QUIRK_BATTERY)
1802                 return __wacom_initialize_battery(wacom, &wacom->battery);
1803
1804         return 0;
1805 }
1806
1807 static void wacom_destroy_battery(struct wacom *wacom)
1808 {
1809         if (wacom->battery.battery) {
1810                 devres_release_group(&wacom->hdev->dev,
1811                                      &wacom->battery.bat_desc);
1812                 wacom->battery.battery = NULL;
1813         }
1814 }
1815
1816 static ssize_t wacom_show_speed(struct device *dev,
1817                                 struct device_attribute
1818                                 *attr, char *buf)
1819 {
1820         struct hid_device *hdev = to_hid_device(dev);
1821         struct wacom *wacom = hid_get_drvdata(hdev);
1822
1823         return sysfs_emit(buf, "%i\n", wacom->wacom_wac.bt_high_speed);
1824 }
1825
1826 static ssize_t wacom_store_speed(struct device *dev,
1827                                 struct device_attribute *attr,
1828                                 const char *buf, size_t count)
1829 {
1830         struct hid_device *hdev = to_hid_device(dev);
1831         struct wacom *wacom = hid_get_drvdata(hdev);
1832         u8 new_speed;
1833
1834         if (kstrtou8(buf, 0, &new_speed))
1835                 return -EINVAL;
1836
1837         if (new_speed != 0 && new_speed != 1)
1838                 return -EINVAL;
1839
1840         wacom_bt_query_tablet_data(hdev, new_speed, &wacom->wacom_wac.features);
1841
1842         return count;
1843 }
1844
1845 static DEVICE_ATTR(speed, DEV_ATTR_RW_PERM,
1846                 wacom_show_speed, wacom_store_speed);
1847
1848
1849 static ssize_t wacom_show_remote_mode(struct kobject *kobj,
1850                                       struct kobj_attribute *kattr,
1851                                       char *buf, int index)
1852 {
1853         struct device *dev = kobj_to_dev(kobj->parent);
1854         struct hid_device *hdev = to_hid_device(dev);
1855         struct wacom *wacom = hid_get_drvdata(hdev);
1856         u8 mode;
1857
1858         mode = wacom->led.groups[index].select;
1859         return sprintf(buf, "%d\n", mode < 3 ? mode : -1);
1860 }
1861
1862 #define DEVICE_EKR_ATTR_GROUP(SET_ID)                                   \
1863 static ssize_t wacom_show_remote##SET_ID##_mode(struct kobject *kobj,   \
1864                                struct kobj_attribute *kattr, char *buf) \
1865 {                                                                       \
1866         return wacom_show_remote_mode(kobj, kattr, buf, SET_ID);        \
1867 }                                                                       \
1868 static struct kobj_attribute remote##SET_ID##_mode_attr = {             \
1869         .attr = {.name = "remote_mode",                                 \
1870                 .mode = DEV_ATTR_RO_PERM},                              \
1871         .show = wacom_show_remote##SET_ID##_mode,                       \
1872 };                                                                      \
1873 static struct attribute *remote##SET_ID##_serial_attrs[] = {            \
1874         &remote##SET_ID##_mode_attr.attr,                               \
1875         NULL                                                            \
1876 };                                                                      \
1877 static const struct attribute_group remote##SET_ID##_serial_group = {   \
1878         .name = NULL,                                                   \
1879         .attrs = remote##SET_ID##_serial_attrs,                         \
1880 }
1881
1882 DEVICE_EKR_ATTR_GROUP(0);
1883 DEVICE_EKR_ATTR_GROUP(1);
1884 DEVICE_EKR_ATTR_GROUP(2);
1885 DEVICE_EKR_ATTR_GROUP(3);
1886 DEVICE_EKR_ATTR_GROUP(4);
1887
1888 static int wacom_remote_create_attr_group(struct wacom *wacom, __u32 serial,
1889                                           int index)
1890 {
1891         int error = 0;
1892         struct wacom_remote *remote = wacom->remote;
1893
1894         remote->remotes[index].group.name = devm_kasprintf(&wacom->hdev->dev,
1895                                                           GFP_KERNEL,
1896                                                           "%d", serial);
1897         if (!remote->remotes[index].group.name)
1898                 return -ENOMEM;
1899
1900         error = __wacom_devm_sysfs_create_group(wacom, remote->remote_dir,
1901                                                 &remote->remotes[index].group);
1902         if (error) {
1903                 remote->remotes[index].group.name = NULL;
1904                 hid_err(wacom->hdev,
1905                         "cannot create sysfs group err: %d\n", error);
1906                 return error;
1907         }
1908
1909         return 0;
1910 }
1911
1912 static int wacom_cmd_unpair_remote(struct wacom *wacom, unsigned char selector)
1913 {
1914         const size_t buf_size = 2;
1915         unsigned char *buf;
1916         int retval;
1917
1918         buf = kzalloc(buf_size, GFP_KERNEL);
1919         if (!buf)
1920                 return -ENOMEM;
1921
1922         buf[0] = WAC_CMD_DELETE_PAIRING;
1923         buf[1] = selector;
1924
1925         retval = wacom_set_report(wacom->hdev, HID_OUTPUT_REPORT, buf,
1926                                   buf_size, WAC_CMD_RETRIES);
1927         kfree(buf);
1928
1929         return retval;
1930 }
1931
1932 static ssize_t wacom_store_unpair_remote(struct kobject *kobj,
1933                                          struct kobj_attribute *attr,
1934                                          const char *buf, size_t count)
1935 {
1936         unsigned char selector = 0;
1937         struct device *dev = kobj_to_dev(kobj->parent);
1938         struct hid_device *hdev = to_hid_device(dev);
1939         struct wacom *wacom = hid_get_drvdata(hdev);
1940         int err;
1941
1942         if (!strncmp(buf, "*\n", 2)) {
1943                 selector = WAC_CMD_UNPAIR_ALL;
1944         } else {
1945                 hid_info(wacom->hdev, "remote: unrecognized unpair code: %s\n",
1946                          buf);
1947                 return -1;
1948         }
1949
1950         mutex_lock(&wacom->lock);
1951
1952         err = wacom_cmd_unpair_remote(wacom, selector);
1953         mutex_unlock(&wacom->lock);
1954
1955         return err < 0 ? err : count;
1956 }
1957
1958 static struct kobj_attribute unpair_remote_attr = {
1959         .attr = {.name = "unpair_remote", .mode = 0200},
1960         .store = wacom_store_unpair_remote,
1961 };
1962
1963 static const struct attribute *remote_unpair_attrs[] = {
1964         &unpair_remote_attr.attr,
1965         NULL
1966 };
1967
1968 static void wacom_remotes_destroy(void *data)
1969 {
1970         struct wacom *wacom = data;
1971         struct wacom_remote *remote = wacom->remote;
1972
1973         if (!remote)
1974                 return;
1975
1976         kobject_put(remote->remote_dir);
1977         kfifo_free(&remote->remote_fifo);
1978         wacom->remote = NULL;
1979 }
1980
1981 static int wacom_initialize_remotes(struct wacom *wacom)
1982 {
1983         int error = 0;
1984         struct wacom_remote *remote;
1985         int i;
1986
1987         if (wacom->wacom_wac.features.type != REMOTE)
1988                 return 0;
1989
1990         remote = devm_kzalloc(&wacom->hdev->dev, sizeof(*wacom->remote),
1991                               GFP_KERNEL);
1992         if (!remote)
1993                 return -ENOMEM;
1994
1995         wacom->remote = remote;
1996
1997         spin_lock_init(&remote->remote_lock);
1998
1999         error = kfifo_alloc(&remote->remote_fifo,
2000                         5 * sizeof(struct wacom_remote_data),
2001                         GFP_KERNEL);
2002         if (error) {
2003                 hid_err(wacom->hdev, "failed allocating remote_fifo\n");
2004                 return -ENOMEM;
2005         }
2006
2007         remote->remotes[0].group = remote0_serial_group;
2008         remote->remotes[1].group = remote1_serial_group;
2009         remote->remotes[2].group = remote2_serial_group;
2010         remote->remotes[3].group = remote3_serial_group;
2011         remote->remotes[4].group = remote4_serial_group;
2012
2013         remote->remote_dir = kobject_create_and_add("wacom_remote",
2014                                                     &wacom->hdev->dev.kobj);
2015         if (!remote->remote_dir)
2016                 return -ENOMEM;
2017
2018         error = sysfs_create_files(remote->remote_dir, remote_unpair_attrs);
2019
2020         if (error) {
2021                 hid_err(wacom->hdev,
2022                         "cannot create sysfs group err: %d\n", error);
2023                 return error;
2024         }
2025
2026         for (i = 0; i < WACOM_MAX_REMOTES; i++) {
2027                 wacom->led.groups[i].select = WACOM_STATUS_UNKNOWN;
2028                 remote->remotes[i].serial = 0;
2029         }
2030
2031         error = devm_add_action_or_reset(&wacom->hdev->dev,
2032                                          wacom_remotes_destroy, wacom);
2033         if (error)
2034                 return error;
2035
2036         return 0;
2037 }
2038
2039 static struct input_dev *wacom_allocate_input(struct wacom *wacom)
2040 {
2041         struct input_dev *input_dev;
2042         struct hid_device *hdev = wacom->hdev;
2043         struct wacom_wac *wacom_wac = &(wacom->wacom_wac);
2044
2045         input_dev = devm_input_allocate_device(&hdev->dev);
2046         if (!input_dev)
2047                 return NULL;
2048
2049         input_dev->name = wacom_wac->features.name;
2050         input_dev->phys = hdev->phys;
2051         input_dev->dev.parent = &hdev->dev;
2052         input_dev->open = wacom_open;
2053         input_dev->close = wacom_close;
2054         input_dev->uniq = hdev->uniq;
2055         input_dev->id.bustype = hdev->bus;
2056         input_dev->id.vendor  = hdev->vendor;
2057         input_dev->id.product = wacom_wac->pid ? wacom_wac->pid : hdev->product;
2058         input_dev->id.version = hdev->version;
2059         input_set_drvdata(input_dev, wacom);
2060
2061         return input_dev;
2062 }
2063
2064 static int wacom_allocate_inputs(struct wacom *wacom)
2065 {
2066         struct wacom_wac *wacom_wac = &(wacom->wacom_wac);
2067
2068         wacom_wac->pen_input = wacom_allocate_input(wacom);
2069         wacom_wac->touch_input = wacom_allocate_input(wacom);
2070         wacom_wac->pad_input = wacom_allocate_input(wacom);
2071         if (!wacom_wac->pen_input ||
2072             !wacom_wac->touch_input ||
2073             !wacom_wac->pad_input)
2074                 return -ENOMEM;
2075
2076         wacom_wac->pen_input->name = wacom_wac->pen_name;
2077         wacom_wac->touch_input->name = wacom_wac->touch_name;
2078         wacom_wac->pad_input->name = wacom_wac->pad_name;
2079
2080         return 0;
2081 }
2082
2083 static int wacom_register_inputs(struct wacom *wacom)
2084 {
2085         struct input_dev *pen_input_dev, *touch_input_dev, *pad_input_dev;
2086         struct wacom_wac *wacom_wac = &(wacom->wacom_wac);
2087         int error = 0;
2088
2089         pen_input_dev = wacom_wac->pen_input;
2090         touch_input_dev = wacom_wac->touch_input;
2091         pad_input_dev = wacom_wac->pad_input;
2092
2093         if (!pen_input_dev || !touch_input_dev || !pad_input_dev)
2094                 return -EINVAL;
2095
2096         error = wacom_setup_pen_input_capabilities(pen_input_dev, wacom_wac);
2097         if (error) {
2098                 /* no pen in use on this interface */
2099                 input_free_device(pen_input_dev);
2100                 wacom_wac->pen_input = NULL;
2101                 pen_input_dev = NULL;
2102         } else {
2103                 error = input_register_device(pen_input_dev);
2104                 if (error)
2105                         goto fail;
2106         }
2107
2108         error = wacom_setup_touch_input_capabilities(touch_input_dev, wacom_wac);
2109         if (error) {
2110                 /* no touch in use on this interface */
2111                 input_free_device(touch_input_dev);
2112                 wacom_wac->touch_input = NULL;
2113                 touch_input_dev = NULL;
2114         } else {
2115                 error = input_register_device(touch_input_dev);
2116                 if (error)
2117                         goto fail;
2118         }
2119
2120         error = wacom_setup_pad_input_capabilities(pad_input_dev, wacom_wac);
2121         if (error) {
2122                 /* no pad events using this interface */
2123                 input_free_device(pad_input_dev);
2124                 wacom_wac->pad_input = NULL;
2125                 pad_input_dev = NULL;
2126         } else {
2127                 error = input_register_device(pad_input_dev);
2128                 if (error)
2129                         goto fail;
2130         }
2131
2132         return 0;
2133
2134 fail:
2135         wacom_wac->pad_input = NULL;
2136         wacom_wac->touch_input = NULL;
2137         wacom_wac->pen_input = NULL;
2138         return error;
2139 }
2140
2141 /*
2142  * Not all devices report physical dimensions from HID.
2143  * Compute the default from hardcoded logical dimension
2144  * and resolution before driver overwrites them.
2145  */
2146 static void wacom_set_default_phy(struct wacom_features *features)
2147 {
2148         if (features->x_resolution) {
2149                 features->x_phy = (features->x_max * 100) /
2150                                         features->x_resolution;
2151                 features->y_phy = (features->y_max * 100) /
2152                                         features->y_resolution;
2153         }
2154 }
2155
2156 static void wacom_calculate_res(struct wacom_features *features)
2157 {
2158         /* set unit to "100th of a mm" for devices not reported by HID */
2159         if (!features->unit) {
2160                 features->unit = 0x11;
2161                 features->unitExpo = -3;
2162         }
2163
2164         features->x_resolution = wacom_calc_hid_res(features->x_max,
2165                                                     features->x_phy,
2166                                                     features->unit,
2167                                                     features->unitExpo);
2168         features->y_resolution = wacom_calc_hid_res(features->y_max,
2169                                                     features->y_phy,
2170                                                     features->unit,
2171                                                     features->unitExpo);
2172 }
2173
2174 void wacom_battery_work(struct work_struct *work)
2175 {
2176         struct wacom *wacom = container_of(work, struct wacom, battery_work);
2177
2178         if ((wacom->wacom_wac.features.quirks & WACOM_QUIRK_BATTERY) &&
2179              !wacom->battery.battery) {
2180                 wacom_initialize_battery(wacom);
2181         }
2182         else if (!(wacom->wacom_wac.features.quirks & WACOM_QUIRK_BATTERY) &&
2183                  wacom->battery.battery) {
2184                 wacom_destroy_battery(wacom);
2185         }
2186 }
2187
2188 static size_t wacom_compute_pktlen(struct hid_device *hdev)
2189 {
2190         struct hid_report_enum *report_enum;
2191         struct hid_report *report;
2192         size_t size = 0;
2193
2194         report_enum = hdev->report_enum + HID_INPUT_REPORT;
2195
2196         list_for_each_entry(report, &report_enum->report_list, list) {
2197                 size_t report_size = hid_report_len(report);
2198                 if (report_size > size)
2199                         size = report_size;
2200         }
2201
2202         return size;
2203 }
2204
2205 static void wacom_update_name(struct wacom *wacom, const char *suffix)
2206 {
2207         struct wacom_wac *wacom_wac = &wacom->wacom_wac;
2208         struct wacom_features *features = &wacom_wac->features;
2209         char name[WACOM_NAME_MAX - 20]; /* Leave some room for suffixes */
2210
2211         /* Generic devices name unspecified */
2212         if ((features->type == HID_GENERIC) && !strcmp("Wacom HID", features->name)) {
2213                 char *product_name = wacom->hdev->name;
2214
2215                 if (hid_is_usb(wacom->hdev)) {
2216                         struct usb_interface *intf = to_usb_interface(wacom->hdev->dev.parent);
2217                         struct usb_device *dev = interface_to_usbdev(intf);
2218                         product_name = dev->product;
2219                 }
2220
2221                 if (wacom->hdev->bus == BUS_I2C) {
2222                         snprintf(name, sizeof(name), "%s %X",
2223                                  features->name, wacom->hdev->product);
2224                 } else if (strstr(product_name, "Wacom") ||
2225                            strstr(product_name, "wacom") ||
2226                            strstr(product_name, "WACOM")) {
2227                         strscpy(name, product_name, sizeof(name));
2228                 } else {
2229                         snprintf(name, sizeof(name), "Wacom %s", product_name);
2230                 }
2231
2232                 /* strip out excess whitespaces */
2233                 while (1) {
2234                         char *gap = strstr(name, "  ");
2235                         if (gap == NULL)
2236                                 break;
2237                         /* shift everything including the terminator */
2238                         memmove(gap, gap+1, strlen(gap));
2239                 }
2240
2241                 /* get rid of trailing whitespace */
2242                 if (name[strlen(name)-1] == ' ')
2243                         name[strlen(name)-1] = '\0';
2244         } else {
2245                 strscpy(name, features->name, sizeof(name));
2246         }
2247
2248         snprintf(wacom_wac->name, sizeof(wacom_wac->name), "%s%s",
2249                  name, suffix);
2250
2251         /* Append the device type to the name */
2252         snprintf(wacom_wac->pen_name, sizeof(wacom_wac->pen_name),
2253                 "%s%s Pen", name, suffix);
2254         snprintf(wacom_wac->touch_name, sizeof(wacom_wac->touch_name),
2255                 "%s%s Finger", name, suffix);
2256         snprintf(wacom_wac->pad_name, sizeof(wacom_wac->pad_name),
2257                 "%s%s Pad", name, suffix);
2258 }
2259
2260 static void wacom_release_resources(struct wacom *wacom)
2261 {
2262         struct hid_device *hdev = wacom->hdev;
2263
2264         if (!wacom->resources)
2265                 return;
2266
2267         devres_release_group(&hdev->dev, wacom);
2268
2269         wacom->resources = false;
2270
2271         wacom->wacom_wac.pen_input = NULL;
2272         wacom->wacom_wac.touch_input = NULL;
2273         wacom->wacom_wac.pad_input = NULL;
2274 }
2275
2276 static void wacom_set_shared_values(struct wacom_wac *wacom_wac)
2277 {
2278         if (wacom_wac->features.device_type & WACOM_DEVICETYPE_TOUCH) {
2279                 wacom_wac->shared->type = wacom_wac->features.type;
2280                 wacom_wac->shared->touch_input = wacom_wac->touch_input;
2281         }
2282
2283         if (wacom_wac->has_mute_touch_switch) {
2284                 wacom_wac->shared->has_mute_touch_switch = true;
2285                 /* Hardware touch switch may be off. Wait until
2286                  * we know the switch state to decide is_touch_on.
2287                  * Softkey state should be initialized to "on" to
2288                  * match historic default.
2289                  */
2290                 if (wacom_wac->is_soft_touch_switch)
2291                         wacom_wac->shared->is_touch_on = true;
2292         }
2293
2294         if (wacom_wac->shared->has_mute_touch_switch &&
2295             wacom_wac->shared->touch_input) {
2296                 set_bit(EV_SW, wacom_wac->shared->touch_input->evbit);
2297                 input_set_capability(wacom_wac->shared->touch_input, EV_SW,
2298                                      SW_MUTE_DEVICE);
2299         }
2300 }
2301
2302 static int wacom_parse_and_register(struct wacom *wacom, bool wireless)
2303 {
2304         struct wacom_wac *wacom_wac = &wacom->wacom_wac;
2305         struct wacom_features *features = &wacom_wac->features;
2306         struct hid_device *hdev = wacom->hdev;
2307         int error;
2308         unsigned int connect_mask = HID_CONNECT_HIDRAW;
2309
2310         features->pktlen = wacom_compute_pktlen(hdev);
2311         if (features->pktlen > WACOM_PKGLEN_MAX)
2312                 return -EINVAL;
2313
2314         if (!devres_open_group(&hdev->dev, wacom, GFP_KERNEL))
2315                 return -ENOMEM;
2316
2317         wacom->resources = true;
2318
2319         error = wacom_allocate_inputs(wacom);
2320         if (error)
2321                 goto fail;
2322
2323         /*
2324          * Bamboo Pad has a generic hid handling for the Pen, and we switch it
2325          * into debug mode for the touch part.
2326          * We ignore the other interfaces.
2327          */
2328         if (features->type == BAMBOO_PAD) {
2329                 if (features->pktlen == WACOM_PKGLEN_PENABLED) {
2330                         features->type = HID_GENERIC;
2331                 } else if ((features->pktlen != WACOM_PKGLEN_BPAD_TOUCH) &&
2332                            (features->pktlen != WACOM_PKGLEN_BPAD_TOUCH_USB)) {
2333                         error = -ENODEV;
2334                         goto fail;
2335                 }
2336         }
2337
2338         /* set the default size in case we do not get them from hid */
2339         wacom_set_default_phy(features);
2340
2341         /* Retrieve the physical and logical size for touch devices */
2342         wacom_retrieve_hid_descriptor(hdev, features);
2343         wacom_setup_device_quirks(wacom);
2344
2345         if (features->device_type == WACOM_DEVICETYPE_NONE &&
2346             features->type != WIRELESS) {
2347                 error = features->type == HID_GENERIC ? -ENODEV : 0;
2348
2349                 dev_warn(&hdev->dev, "Unknown device_type for '%s'. %s.",
2350                          hdev->name,
2351                          error ? "Ignoring" : "Assuming pen");
2352
2353                 if (error)
2354                         goto fail;
2355
2356                 features->device_type |= WACOM_DEVICETYPE_PEN;
2357         }
2358
2359         wacom_calculate_res(features);
2360
2361         wacom_update_name(wacom, wireless ? " (WL)" : "");
2362
2363         /* pen only Bamboo neither support touch nor pad */
2364         if ((features->type == BAMBOO_PEN) &&
2365             ((features->device_type & WACOM_DEVICETYPE_TOUCH) ||
2366             (features->device_type & WACOM_DEVICETYPE_PAD))) {
2367                 error = -ENODEV;
2368                 goto fail;
2369         }
2370
2371         error = wacom_add_shared_data(hdev);
2372         if (error)
2373                 goto fail;
2374
2375         error = wacom_register_inputs(wacom);
2376         if (error)
2377                 goto fail;
2378
2379         if (wacom->wacom_wac.features.device_type & WACOM_DEVICETYPE_PAD) {
2380                 error = wacom_initialize_leds(wacom);
2381                 if (error)
2382                         goto fail;
2383
2384                 error = wacom_initialize_remotes(wacom);
2385                 if (error)
2386                         goto fail;
2387         }
2388
2389         if (features->type == HID_GENERIC)
2390                 connect_mask |= HID_CONNECT_DRIVER;
2391
2392         /* Regular HID work starts now */
2393         error = hid_hw_start(hdev, connect_mask);
2394         if (error) {
2395                 hid_err(hdev, "hw start failed\n");
2396                 goto fail;
2397         }
2398
2399         if (!wireless) {
2400                 /* Note that if query fails it is not a hard failure */
2401                 wacom_query_tablet_data(wacom);
2402         }
2403
2404         /* touch only Bamboo doesn't support pen */
2405         if ((features->type == BAMBOO_TOUCH) &&
2406             (features->device_type & WACOM_DEVICETYPE_PEN)) {
2407                 cancel_delayed_work_sync(&wacom->init_work);
2408                 _wacom_query_tablet_data(wacom);
2409                 error = -ENODEV;
2410                 goto fail_quirks;
2411         }
2412
2413         if (features->device_type & WACOM_DEVICETYPE_WL_MONITOR)
2414                 error = hid_hw_open(hdev);
2415
2416         wacom_set_shared_values(wacom_wac);
2417         devres_close_group(&hdev->dev, wacom);
2418
2419         return 0;
2420
2421 fail_quirks:
2422         hid_hw_stop(hdev);
2423 fail:
2424         wacom_release_resources(wacom);
2425         return error;
2426 }
2427
2428 static void wacom_wireless_work(struct work_struct *work)
2429 {
2430         struct wacom *wacom = container_of(work, struct wacom, wireless_work);
2431         struct usb_device *usbdev = wacom->usbdev;
2432         struct wacom_wac *wacom_wac = &wacom->wacom_wac;
2433         struct hid_device *hdev1, *hdev2;
2434         struct wacom *wacom1, *wacom2;
2435         struct wacom_wac *wacom_wac1, *wacom_wac2;
2436         int error;
2437
2438         /*
2439          * Regardless if this is a disconnect or a new tablet,
2440          * remove any existing input and battery devices.
2441          */
2442
2443         wacom_destroy_battery(wacom);
2444
2445         if (!usbdev)
2446                 return;
2447
2448         /* Stylus interface */
2449         hdev1 = usb_get_intfdata(usbdev->config->interface[1]);
2450         wacom1 = hid_get_drvdata(hdev1);
2451         wacom_wac1 = &(wacom1->wacom_wac);
2452         wacom_release_resources(wacom1);
2453
2454         /* Touch interface */
2455         hdev2 = usb_get_intfdata(usbdev->config->interface[2]);
2456         wacom2 = hid_get_drvdata(hdev2);
2457         wacom_wac2 = &(wacom2->wacom_wac);
2458         wacom_release_resources(wacom2);
2459
2460         if (wacom_wac->pid == 0) {
2461                 hid_info(wacom->hdev, "wireless tablet disconnected\n");
2462         } else {
2463                 const struct hid_device_id *id = wacom_ids;
2464
2465                 hid_info(wacom->hdev, "wireless tablet connected with PID %x\n",
2466                          wacom_wac->pid);
2467
2468                 while (id->bus) {
2469                         if (id->vendor == USB_VENDOR_ID_WACOM &&
2470                             id->product == wacom_wac->pid)
2471                                 break;
2472                         id++;
2473                 }
2474
2475                 if (!id->bus) {
2476                         hid_info(wacom->hdev, "ignoring unknown PID.\n");
2477                         return;
2478                 }
2479
2480                 /* Stylus interface */
2481                 wacom_wac1->features =
2482                         *((struct wacom_features *)id->driver_data);
2483
2484                 wacom_wac1->pid = wacom_wac->pid;
2485                 hid_hw_stop(hdev1);
2486                 error = wacom_parse_and_register(wacom1, true);
2487                 if (error)
2488                         goto fail;
2489
2490                 /* Touch interface */
2491                 if (wacom_wac1->features.touch_max ||
2492                     (wacom_wac1->features.type >= INTUOSHT &&
2493                     wacom_wac1->features.type <= BAMBOO_PT)) {
2494                         wacom_wac2->features =
2495                                 *((struct wacom_features *)id->driver_data);
2496                         wacom_wac2->pid = wacom_wac->pid;
2497                         hid_hw_stop(hdev2);
2498                         error = wacom_parse_and_register(wacom2, true);
2499                         if (error)
2500                                 goto fail;
2501                 }
2502
2503                 strscpy(wacom_wac->name, wacom_wac1->name,
2504                         sizeof(wacom_wac->name));
2505         }
2506
2507         return;
2508
2509 fail:
2510         wacom_release_resources(wacom1);
2511         wacom_release_resources(wacom2);
2512         return;
2513 }
2514
2515 static void wacom_remote_destroy_one(struct wacom *wacom, unsigned int index)
2516 {
2517         struct wacom_remote *remote = wacom->remote;
2518         u32 serial = remote->remotes[index].serial;
2519         int i;
2520         unsigned long flags;
2521
2522         for (i = 0; i < WACOM_MAX_REMOTES; i++) {
2523                 if (remote->remotes[i].serial == serial) {
2524
2525                         spin_lock_irqsave(&remote->remote_lock, flags);
2526                         remote->remotes[i].registered = false;
2527                         spin_unlock_irqrestore(&remote->remote_lock, flags);
2528
2529                         if (remote->remotes[i].battery.battery)
2530                                 devres_release_group(&wacom->hdev->dev,
2531                                                      &remote->remotes[i].battery.bat_desc);
2532
2533                         if (remote->remotes[i].group.name)
2534                                 devres_release_group(&wacom->hdev->dev,
2535                                                      &remote->remotes[i]);
2536
2537                         remote->remotes[i].serial = 0;
2538                         remote->remotes[i].group.name = NULL;
2539                         remote->remotes[i].battery.battery = NULL;
2540                         wacom->led.groups[i].select = WACOM_STATUS_UNKNOWN;
2541                 }
2542         }
2543 }
2544
2545 static int wacom_remote_create_one(struct wacom *wacom, u32 serial,
2546                                    unsigned int index)
2547 {
2548         struct wacom_remote *remote = wacom->remote;
2549         struct device *dev = &wacom->hdev->dev;
2550         int error, k;
2551
2552         /* A remote can pair more than once with an EKR,
2553          * check to make sure this serial isn't already paired.
2554          */
2555         for (k = 0; k < WACOM_MAX_REMOTES; k++) {
2556                 if (remote->remotes[k].serial == serial)
2557                         break;
2558         }
2559
2560         if (k < WACOM_MAX_REMOTES) {
2561                 remote->remotes[index].serial = serial;
2562                 return 0;
2563         }
2564
2565         if (!devres_open_group(dev, &remote->remotes[index], GFP_KERNEL))
2566                 return -ENOMEM;
2567
2568         error = wacom_remote_create_attr_group(wacom, serial, index);
2569         if (error)
2570                 goto fail;
2571
2572         remote->remotes[index].input = wacom_allocate_input(wacom);
2573         if (!remote->remotes[index].input) {
2574                 error = -ENOMEM;
2575                 goto fail;
2576         }
2577         remote->remotes[index].input->uniq = remote->remotes[index].group.name;
2578         remote->remotes[index].input->name = wacom->wacom_wac.pad_name;
2579
2580         if (!remote->remotes[index].input->name) {
2581                 error = -EINVAL;
2582                 goto fail;
2583         }
2584
2585         error = wacom_setup_pad_input_capabilities(remote->remotes[index].input,
2586                                                    &wacom->wacom_wac);
2587         if (error)
2588                 goto fail;
2589
2590         remote->remotes[index].serial = serial;
2591
2592         error = input_register_device(remote->remotes[index].input);
2593         if (error)
2594                 goto fail;
2595
2596         error = wacom_led_groups_alloc_and_register_one(
2597                                         &remote->remotes[index].input->dev,
2598                                         wacom, index, 3, true);
2599         if (error)
2600                 goto fail;
2601
2602         remote->remotes[index].registered = true;
2603
2604         devres_close_group(dev, &remote->remotes[index]);
2605         return 0;
2606
2607 fail:
2608         devres_release_group(dev, &remote->remotes[index]);
2609         remote->remotes[index].serial = 0;
2610         return error;
2611 }
2612
2613 static int wacom_remote_attach_battery(struct wacom *wacom, int index)
2614 {
2615         struct wacom_remote *remote = wacom->remote;
2616         int error;
2617
2618         if (!remote->remotes[index].registered)
2619                 return 0;
2620
2621         if (remote->remotes[index].battery.battery)
2622                 return 0;
2623
2624         if (wacom->led.groups[index].select == WACOM_STATUS_UNKNOWN)
2625                 return 0;
2626
2627         error = __wacom_initialize_battery(wacom,
2628                                         &wacom->remote->remotes[index].battery);
2629         if (error)
2630                 return error;
2631
2632         return 0;
2633 }
2634
2635 static void wacom_remote_work(struct work_struct *work)
2636 {
2637         struct wacom *wacom = container_of(work, struct wacom, remote_work);
2638         struct wacom_remote *remote = wacom->remote;
2639         struct wacom_remote_data data;
2640         unsigned long flags;
2641         unsigned int count;
2642         u32 serial;
2643         int i;
2644
2645         spin_lock_irqsave(&remote->remote_lock, flags);
2646
2647         count = kfifo_out(&remote->remote_fifo, &data, sizeof(data));
2648
2649         if (count != sizeof(data)) {
2650                 hid_err(wacom->hdev,
2651                         "workitem triggered without status available\n");
2652                 spin_unlock_irqrestore(&remote->remote_lock, flags);
2653                 return;
2654         }
2655
2656         if (!kfifo_is_empty(&remote->remote_fifo))
2657                 wacom_schedule_work(&wacom->wacom_wac, WACOM_WORKER_REMOTE);
2658
2659         spin_unlock_irqrestore(&remote->remote_lock, flags);
2660
2661         for (i = 0; i < WACOM_MAX_REMOTES; i++) {
2662                 serial = data.remote[i].serial;
2663                 if (data.remote[i].connected) {
2664
2665                         if (remote->remotes[i].serial == serial) {
2666                                 wacom_remote_attach_battery(wacom, i);
2667                                 continue;
2668                         }
2669
2670                         if (remote->remotes[i].serial)
2671                                 wacom_remote_destroy_one(wacom, i);
2672
2673                         wacom_remote_create_one(wacom, serial, i);
2674
2675                 } else if (remote->remotes[i].serial) {
2676                         wacom_remote_destroy_one(wacom, i);
2677                 }
2678         }
2679 }
2680
2681 static void wacom_mode_change_work(struct work_struct *work)
2682 {
2683         struct wacom *wacom = container_of(work, struct wacom, mode_change_work);
2684         struct wacom_shared *shared = wacom->wacom_wac.shared;
2685         struct wacom *wacom1 = NULL;
2686         struct wacom *wacom2 = NULL;
2687         bool is_direct = wacom->wacom_wac.is_direct_mode;
2688         int error = 0;
2689
2690         if (shared->pen) {
2691                 wacom1 = hid_get_drvdata(shared->pen);
2692                 wacom_release_resources(wacom1);
2693                 hid_hw_stop(wacom1->hdev);
2694                 wacom1->wacom_wac.has_mode_change = true;
2695                 wacom1->wacom_wac.is_direct_mode = is_direct;
2696         }
2697
2698         if (shared->touch) {
2699                 wacom2 = hid_get_drvdata(shared->touch);
2700                 wacom_release_resources(wacom2);
2701                 hid_hw_stop(wacom2->hdev);
2702                 wacom2->wacom_wac.has_mode_change = true;
2703                 wacom2->wacom_wac.is_direct_mode = is_direct;
2704         }
2705
2706         if (wacom1) {
2707                 error = wacom_parse_and_register(wacom1, false);
2708                 if (error)
2709                         return;
2710         }
2711
2712         if (wacom2) {
2713                 error = wacom_parse_and_register(wacom2, false);
2714                 if (error)
2715                         return;
2716         }
2717
2718         return;
2719 }
2720
2721 static int wacom_probe(struct hid_device *hdev,
2722                 const struct hid_device_id *id)
2723 {
2724         struct wacom *wacom;
2725         struct wacom_wac *wacom_wac;
2726         struct wacom_features *features;
2727         int error;
2728
2729         if (!id->driver_data)
2730                 return -EINVAL;
2731
2732         hdev->quirks |= HID_QUIRK_NO_INIT_REPORTS;
2733
2734         /* hid-core sets this quirk for the boot interface */
2735         hdev->quirks &= ~HID_QUIRK_NOGET;
2736
2737         wacom = devm_kzalloc(&hdev->dev, sizeof(struct wacom), GFP_KERNEL);
2738         if (!wacom)
2739                 return -ENOMEM;
2740
2741         hid_set_drvdata(hdev, wacom);
2742         wacom->hdev = hdev;
2743
2744         wacom_wac = &wacom->wacom_wac;
2745         wacom_wac->features = *((struct wacom_features *)id->driver_data);
2746         features = &wacom_wac->features;
2747
2748         if (features->check_for_hid_type && features->hid_type != hdev->type)
2749                 return -ENODEV;
2750
2751         error = wacom_devm_kfifo_alloc(wacom);
2752         if (error)
2753                 return error;
2754
2755         wacom_wac->hid_data.inputmode = -1;
2756         wacom_wac->mode_report = -1;
2757
2758         if (hid_is_usb(hdev)) {
2759                 struct usb_interface *intf = to_usb_interface(hdev->dev.parent);
2760                 struct usb_device *dev = interface_to_usbdev(intf);
2761
2762                 wacom->usbdev = dev;
2763                 wacom->intf = intf;
2764         }
2765
2766         mutex_init(&wacom->lock);
2767         INIT_DELAYED_WORK(&wacom->init_work, wacom_init_work);
2768         INIT_WORK(&wacom->wireless_work, wacom_wireless_work);
2769         INIT_WORK(&wacom->battery_work, wacom_battery_work);
2770         INIT_WORK(&wacom->remote_work, wacom_remote_work);
2771         INIT_WORK(&wacom->mode_change_work, wacom_mode_change_work);
2772         timer_setup(&wacom->idleprox_timer, &wacom_idleprox_timeout, TIMER_DEFERRABLE);
2773
2774         /* ask for the report descriptor to be loaded by HID */
2775         error = hid_parse(hdev);
2776         if (error) {
2777                 hid_err(hdev, "parse failed\n");
2778                 return error;
2779         }
2780
2781         if (features->type == BOOTLOADER) {
2782                 hid_warn(hdev, "Using device in hidraw-only mode");
2783                 return hid_hw_start(hdev, HID_CONNECT_HIDRAW);
2784         }
2785
2786         error = wacom_parse_and_register(wacom, false);
2787         if (error)
2788                 return error;
2789
2790         if (hdev->bus == BUS_BLUETOOTH) {
2791                 error = device_create_file(&hdev->dev, &dev_attr_speed);
2792                 if (error)
2793                         hid_warn(hdev,
2794                                  "can't create sysfs speed attribute err: %d\n",
2795                                  error);
2796         }
2797
2798         wacom_wac->probe_complete = true;
2799         return 0;
2800 }
2801
2802 static void wacom_remove(struct hid_device *hdev)
2803 {
2804         struct wacom *wacom = hid_get_drvdata(hdev);
2805         struct wacom_wac *wacom_wac = &wacom->wacom_wac;
2806         struct wacom_features *features = &wacom_wac->features;
2807
2808         if (features->device_type & WACOM_DEVICETYPE_WL_MONITOR)
2809                 hid_hw_close(hdev);
2810
2811         hid_hw_stop(hdev);
2812
2813         cancel_delayed_work_sync(&wacom->init_work);
2814         cancel_work_sync(&wacom->wireless_work);
2815         cancel_work_sync(&wacom->battery_work);
2816         cancel_work_sync(&wacom->remote_work);
2817         cancel_work_sync(&wacom->mode_change_work);
2818         del_timer_sync(&wacom->idleprox_timer);
2819         if (hdev->bus == BUS_BLUETOOTH)
2820                 device_remove_file(&hdev->dev, &dev_attr_speed);
2821
2822         /* make sure we don't trigger the LEDs */
2823         wacom_led_groups_release(wacom);
2824
2825         if (wacom->wacom_wac.features.type != REMOTE)
2826                 wacom_release_resources(wacom);
2827 }
2828
2829 #ifdef CONFIG_PM
2830 static int wacom_resume(struct hid_device *hdev)
2831 {
2832         struct wacom *wacom = hid_get_drvdata(hdev);
2833
2834         mutex_lock(&wacom->lock);
2835
2836         /* switch to wacom mode first */
2837         _wacom_query_tablet_data(wacom);
2838         wacom_led_control(wacom);
2839
2840         mutex_unlock(&wacom->lock);
2841
2842         return 0;
2843 }
2844
2845 static int wacom_reset_resume(struct hid_device *hdev)
2846 {
2847         return wacom_resume(hdev);
2848 }
2849 #endif /* CONFIG_PM */
2850
2851 static struct hid_driver wacom_driver = {
2852         .name =         "wacom",
2853         .id_table =     wacom_ids,
2854         .probe =        wacom_probe,
2855         .remove =       wacom_remove,
2856         .report =       wacom_wac_report,
2857 #ifdef CONFIG_PM
2858         .resume =       wacom_resume,
2859         .reset_resume = wacom_reset_resume,
2860 #endif
2861         .raw_event =    wacom_raw_event,
2862 };
2863 module_hid_driver(wacom_driver);
2864
2865 MODULE_VERSION(DRIVER_VERSION);
2866 MODULE_AUTHOR(DRIVER_AUTHOR);
2867 MODULE_DESCRIPTION(DRIVER_DESC);
2868 MODULE_LICENSE("GPL");