drivers/hid/wacom_sys.c

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