drivers/hid/wacom_sys.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * drivers/input/tablet/wacom_sys.c
   4  *
   5  *  USB Wacom tablet support - system specific code
   6  */
   7
   8 /*
   9  */
  10
  11 #include "wacom_wac.h"
  12 #include "wacom.h"
  13 #include <linux/input/mt.h>
  14
  15 #define WAC_MSG_RETRIES         5
  16 #define WAC_CMD_RETRIES         10
  17
  18 #define DEV_ATTR_RW_PERM (S_IRUGO | S_IWUSR | S_IWGRP)
  19 #define DEV_ATTR_WO_PERM (S_IWUSR | S_IWGRP)
  20 #define DEV_ATTR_RO_PERM (S_IRUSR | S_IRGRP)
  21
  22 static int wacom_get_report(struct hid_device *hdev, u8 type, u8 *buf,
  23                             size_t size, unsigned int retries)
  24 {
  25         int retval;
  26
  27         do {
  28                 retval = hid_hw_raw_request(hdev, buf[0], buf, size, type,
  29                                 HID_REQ_GET_REPORT);
  30         } while ((retval == -ETIMEDOUT || retval == -EAGAIN) && --retries);
  31
  32         if (retval < 0)
  33                 hid_err(hdev, "wacom_get_report: ran out of retries "
  34                         "(last error = %d)\n", retval);
  35
  36         return retval;
  37 }
  38
  39 static int wacom_set_report(struct hid_device *hdev, u8 type, u8 *buf,
  40                             size_t size, unsigned int retries)
  41 {
  42         int retval;
  43
  44         do {
  45                 retval = hid_hw_raw_request(hdev, buf[0], buf, size, type,
  46                                 HID_REQ_SET_REPORT);
  47         } while ((retval == -ETIMEDOUT || retval == -EAGAIN) && --retries);
  48
  49         if (retval < 0)
  50                 hid_err(hdev, "wacom_set_report: ran out of retries "
  51                         "(last error = %d)\n", retval);
  52
  53         return retval;
  54 }
  55
  56 static void wacom_wac_queue_insert(struct hid_device *hdev,
  57                                    struct kfifo_rec_ptr_2 *fifo,
  58                                    u8 *raw_data, int size)
  59 {
  60         bool warned = false;
  61
  62         while (kfifo_avail(fifo) < size) {
  63                 if (!warned)
  64                         hid_warn(hdev, "%s: kfifo has filled, starting to drop events\n", __func__);
  65                 warned = true;
  66
  67                 kfifo_skip(fifo);
  68         }
  69
  70         kfifo_in(fifo, raw_data, size);
  71 }
  72
  73 static void wacom_wac_queue_flush(struct hid_device *hdev,
  74                                   struct kfifo_rec_ptr_2 *fifo)
  75 {
  76         while (!kfifo_is_empty(fifo)) {
  77                 u8 buf[WACOM_PKGLEN_MAX];
  78                 int size;
  79                 int err;
  80
  81                 size = kfifo_out(fifo, buf, sizeof(buf));
  82                 err = hid_report_raw_event(hdev, HID_INPUT_REPORT, buf, size, false);
  83                 if (err) {
  84                         hid_warn(hdev, "%s: unable to flush event due to error %d\n",
  85                                  __func__, err);
  86                 }
  87         }
  88 }
  89
  90 static int wacom_wac_pen_serial_enforce(struct hid_device *hdev,
  91                 struct hid_report *report, u8 *raw_data, int report_size)
  92 {
  93         struct wacom *wacom = hid_get_drvdata(hdev);
  94         struct wacom_wac *wacom_wac = &wacom->wacom_wac;
  95         struct wacom_features *features = &wacom_wac->features;
  96         bool flush = false;
  97         bool insert = false;
  98         int i, j;
  99
 100         if (wacom_wac->serial[0] || !(features->quirks & WACOM_QUIRK_TOOLSERIAL))
 101                 return 0;
 102
 103         /* Queue events which have invalid tool type or serial number */
 104         for (i = 0; i < report->maxfield; i++) {
 105                 for (j = 0; j < report->field[i]->maxusage; j++) {
 106                         struct hid_field *field = report->field[i];
 107                         struct hid_usage *usage = &field->usage[j];
 108                         unsigned int equivalent_usage = wacom_equivalent_usage(usage->hid);
 109                         unsigned int offset;
 110                         unsigned int size;
 111                         unsigned int value;
 112
 113                         if (equivalent_usage != HID_DG_INRANGE &&
 114                             equivalent_usage != HID_DG_TOOLSERIALNUMBER &&
 115                             equivalent_usage != WACOM_HID_WD_SERIALHI &&
 116                             equivalent_usage != WACOM_HID_WD_TOOLTYPE)
 117                                 continue;
 118
 119                         offset = field->report_offset;
 120                         size = field->report_size;
 121                         value = hid_field_extract(hdev, raw_data+1, offset + j * size, size);
 122
 123                         /* If we go out of range, we need to flush the queue ASAP */
 124                         if (equivalent_usage == HID_DG_INRANGE)
 125                                 value = !value;
 126
 127                         if (value) {
 128                                 flush = true;
 129                                 switch (equivalent_usage) {
 130                                 case HID_DG_TOOLSERIALNUMBER:
 131                                         wacom_wac->serial[0] = value;
 132                                         break;
 133
 134                                 case WACOM_HID_WD_SERIALHI:
 135                                         wacom_wac->serial[0] |= ((__u64)value) << 32;
 136                                         break;
 137
 138                                 case WACOM_HID_WD_TOOLTYPE:
 139                                         wacom_wac->id[0] = value;
 140                                         break;
 141                                 }
 142                         }
 143                         else {
 144                                 insert = true;
 145                         }
 146                 }
 147         }
 148
 149         if (flush)
 150                 wacom_wac_queue_flush(hdev, wacom_wac->pen_fifo);
 151         else if (insert)
 152                 wacom_wac_queue_insert(hdev, wacom_wac->pen_fifo,
 153                                        raw_data, report_size);
 154
 155         return insert && !flush;
 156 }
 157
 158 static int wacom_raw_event(struct hid_device *hdev, struct hid_report *report,
 159                 u8 *raw_data, int size)
 160 {
 161         struct wacom *wacom = hid_get_drvdata(hdev);
 162
 163         if (size > WACOM_PKGLEN_MAX)
 164                 return 1;
 165
 166         if (wacom_wac_pen_serial_enforce(hdev, report, raw_data, size))
 167                 return -1;
 168
 169         memcpy(wacom->wacom_wac.data, raw_data, size);
 170
 171         wacom_wac_irq(&wacom->wacom_wac, size);
 172
 173         return 0;
 174 }
 175
 176 static int wacom_open(struct input_dev *dev)
 177 {
 178         struct wacom *wacom = input_get_drvdata(dev);
 179
 180         return hid_hw_open(wacom->hdev);
 181 }
 182
 183 static void wacom_close(struct input_dev *dev)
 184 {
 185         struct wacom *wacom = input_get_drvdata(dev);
 186
 187         /*
 188          * wacom->hdev should never be null, but surprisingly, I had the case
 189          * once while unplugging the Wacom Wireless Receiver.
 190          */
 191         if (wacom->hdev)
 192                 hid_hw_close(wacom->hdev);
 193 }
 194
 195 /*
 196  * Calculate the resolution of the X or Y axis using hidinput_calc_abs_res.
 197  */
 198 static int wacom_calc_hid_res(int logical_extents, int physical_extents,
 199                                unsigned unit, int exponent)
 200 {
 201         struct hid_field field = {
 202                 .logical_maximum = logical_extents,
 203                 .physical_maximum = physical_extents,
 204                 .unit = unit,
 205                 .unit_exponent = exponent,
 206         };
 207
 208         return hidinput_calc_abs_res(&field, ABS_X);
 209 }
 210
 211 static void wacom_hid_usage_quirk(struct hid_device *hdev,
 212                 struct hid_field *field, struct hid_usage *usage)
 213 {
 214         struct wacom *wacom = hid_get_drvdata(hdev);
 215         struct wacom_features *features = &wacom->wacom_wac.features;
 216         unsigned int equivalent_usage = wacom_equivalent_usage(usage->hid);
 217
 218         /*
 219          * The Dell Canvas 27 needs to be switched to its vendor-defined
 220          * report to provide the best resolution.
 221          */
 222         if (hdev->vendor == USB_VENDOR_ID_WACOM &&
 223             hdev->product == 0x4200 &&
 224             field->application == HID_UP_MSVENDOR) {
 225                 wacom->wacom_wac.mode_report = field->report->id;
 226                 wacom->wacom_wac.mode_value = 2;
 227         }
 228
 229         /*
 230          * ISDv4 devices which predate HID's adoption of the
 231          * HID_DG_BARELSWITCH2 usage use 0x000D0000 in its
 232          * position instead. We can accurately detect if a
 233          * usage with that value should be HID_DG_BARRELSWITCH2
 234          * based on the surrounding usages, which have remained
 235          * constant across generations.
 236          */
 237         if (features->type == HID_GENERIC &&
 238             usage->hid == 0x000D0000 &&
 239             field->application == HID_DG_PEN &&
 240             field->physical == HID_DG_STYLUS) {
 241                 int i = usage->usage_index;
 242
 243                 if (i-4 >= 0 && i+1 < field->maxusage &&
 244                     field->usage[i-4].hid == HID_DG_TIPSWITCH &&
 245                     field->usage[i-3].hid == HID_DG_BARRELSWITCH &&
 246                     field->usage[i-2].hid == HID_DG_ERASER &&
 247                     field->usage[i-1].hid == HID_DG_INVERT &&
 248                     field->usage[i+1].hid == HID_DG_INRANGE) {
 249                         usage->hid = HID_DG_BARRELSWITCH2;
 250                 }
 251         }
 252
 253         /*
 254          * Wacom's AES devices use different vendor-defined usages to
 255          * report serial number information compared to their branded
 256          * hardware. The usages are also sometimes ill-defined and do
 257          * not have the correct logical min/max values set. Lets patch
 258          * the descriptor to use the branded usage convention and fix
 259          * the errors.
 260          */
 261         if (usage->hid == WACOM_HID_WT_SERIALNUMBER &&
 262             field->report_size == 16 &&
 263             field->index + 2 < field->report->maxfield) {
 264                 struct hid_field *a = field->report->field[field->index + 1];
 265                 struct hid_field *b = field->report->field[field->index + 2];
 266
 267                 if (a->maxusage > 0 &&
 268                     a->usage[0].hid == HID_DG_TOOLSERIALNUMBER &&
 269                     a->report_size == 32 &&
 270                     b->maxusage > 0 &&
 271                     b->usage[0].hid == 0xFF000000 &&
 272                     b->report_size == 8) {
 273                         features->quirks |= WACOM_QUIRK_AESPEN;
 274                         usage->hid = WACOM_HID_WD_TOOLTYPE;
 275                         field->logical_minimum = S16_MIN;
 276                         field->logical_maximum = S16_MAX;
 277                         a->logical_minimum = S32_MIN;
 278                         a->logical_maximum = S32_MAX;
 279                         b->usage[0].hid = WACOM_HID_WD_SERIALHI;
 280                         b->logical_minimum = 0;
 281                         b->logical_maximum = U8_MAX;
 282                 }
 283         }
 284
 285         /* 2nd-generation Intuos Pro Large has incorrect Y maximum */
 286         if (hdev->vendor == USB_VENDOR_ID_WACOM &&
 287             hdev->product == 0x0358 &&
 288             WACOM_PEN_FIELD(field) &&
 289             equivalent_usage == HID_GD_Y) {
 290                 field->logical_maximum = 43200;
 291         }
 292 }
 293
 294 static void wacom_feature_mapping(struct hid_device *hdev,
 295                 struct hid_field *field, struct hid_usage *usage)
 296 {
 297         struct wacom *wacom = hid_get_drvdata(hdev);
 298         struct wacom_features *features = &wacom->wacom_wac.features;
 299         struct hid_data *hid_data = &wacom->wacom_wac.hid_data;
 300         unsigned int equivalent_usage = wacom_equivalent_usage(usage->hid);
 301         u8 *data;
 302         int ret;
 303         u32 n;
 304
 305         wacom_hid_usage_quirk(hdev, field, usage);
 306
 307         switch (equivalent_usage) {
 308         case WACOM_HID_WD_TOUCH_RING_SETTING:
 309                 wacom->generic_has_leds = true;
 310                 break;
 311         case HID_DG_CONTACTMAX:
 312                 /* leave touch_max as is if predefined */
 313                 if (!features->touch_max) {
 314                         /* read manually */
 315                         n = hid_report_len(field->report);
 316                         data = hid_alloc_report_buf(field->report, GFP_KERNEL);
 317                         if (!data)
 318                                 break;
 319                         data[0] = field->report->id;
 320                         ret = wacom_get_report(hdev, HID_FEATURE_REPORT,
 321                                                data, n, WAC_CMD_RETRIES);
 322                         if (ret == n && features->type == HID_GENERIC) {
 323                                 ret = hid_report_raw_event(hdev,
 324                                         HID_FEATURE_REPORT, data, n, 0);
 325                         } else if (ret == 2 && features->type != HID_GENERIC) {
 326                                 features->touch_max = data[1];
 327                         } else {
 328                                 features->touch_max = 16;
 329                                 hid_warn(hdev, "wacom_feature_mapping: "
 330                                          "could not get HID_DG_CONTACTMAX, "
 331                                          "defaulting to %d\n",
 332                                           features->touch_max);
 333                         }
 334                         kfree(data);
 335                 }
 336                 break;
 337         case HID_DG_INPUTMODE:
 338                 /* Ignore if value index is out of bounds. */
 339                 if (usage->usage_index >= field->report_count) {
 340                         dev_err(&hdev->dev, "HID_DG_INPUTMODE out of range\n");
 341                         break;
 342                 }
 343
 344                 hid_data->inputmode = field->report->id;
 345                 hid_data->inputmode_index = usage->usage_index;
 346                 break;
 347
 348         case HID_UP_DIGITIZER:
 349                 if (field->report->id == 0x0B &&
 350                     (field->application == WACOM_HID_G9_PEN ||
 351                      field->application == WACOM_HID_G11_PEN)) {
 352                         wacom->wacom_wac.mode_report = field->report->id;
 353                         wacom->wacom_wac.mode_value = 0;
 354                 }
 355                 break;
 356
 357         case WACOM_HID_WD_DATAMODE:
 358                 wacom->wacom_wac.mode_report = field->report->id;
 359                 wacom->wacom_wac.mode_value = 2;
 360                 break;
 361
 362         case WACOM_HID_UP_G9:
 363         case WACOM_HID_UP_G11:
 364                 if (field->report->id == 0x03 &&
 365                     (field->application == WACOM_HID_G9_TOUCHSCREEN ||
 366                      field->application == WACOM_HID_G11_TOUCHSCREEN)) {
 367                         wacom->wacom_wac.mode_report = field->report->id;
 368                         wacom->wacom_wac.mode_value = 0;
 369                 }
 370                 break;
 371         case WACOM_HID_WD_OFFSETLEFT:
 372         case WACOM_HID_WD_OFFSETTOP:
 373         case WACOM_HID_WD_OFFSETRIGHT:
 374         case WACOM_HID_WD_OFFSETBOTTOM:
 375                 /* read manually */
 376                 n = hid_report_len(field->report);
 377                 data = hid_alloc_report_buf(field->report, GFP_KERNEL);
 378                 if (!data)
 379                         break;
 380                 data[0] = field->report->id;
 381                 ret = wacom_get_report(hdev, HID_FEATURE_REPORT,
 382                                         data, n, WAC_CMD_RETRIES);
 383                 if (ret == n) {
 384                         ret = hid_report_raw_event(hdev, HID_FEATURE_REPORT,
 385                                                    data, n, 0);
 386                 } else {
 387                         hid_warn(hdev, "%s: could not retrieve sensor offsets\n",
 388                                  __func__);
 389                 }
 390                 kfree(data);
 391                 break;
 392         }
 393 }
 394
 395 /*
 396  * Interface Descriptor of wacom devices can be incomplete and
 397  * inconsistent so wacom_features table is used to store stylus
 398  * device's packet lengths, various maximum values, and tablet
 399  * resolution based on product ID's.
 400  *
 401  * For devices that contain 2 interfaces, wacom_features table is
 402  * inaccurate for the touch interface.  Since the Interface Descriptor
 403  * for touch interfaces has pretty complete data, this function exists
 404  * to query tablet for this missing information instead of hard coding in
 405  * an additional table.
 406  *
 407  * A typical Interface Descriptor for a stylus will contain a
 408  * boot mouse application collection that is not of interest and this
 409  * function will ignore it.
 410  *
 411  * It also contains a digitizer application collection that also is not
 412  * of interest since any information it contains would be duplicate
 413  * of what is in wacom_features. Usually it defines a report of an array
 414  * of bytes that could be used as max length of the stylus packet returned.
 415  * If it happens to define a Digitizer-Stylus Physical Collection then
 416  * the X and Y logical values contain valid data but it is ignored.
 417  *
 418  * A typical Interface Descriptor for a touch interface will contain a
 419  * Digitizer-Finger Physical Collection which will define both logical
 420  * X/Y maximum as well as the physical size of tablet. Since touch
 421  * interfaces haven't supported pressure or distance, this is enough
 422  * information to override invalid values in the wacom_features table.
 423  *
 424  * Intuos5 touch interface and 3rd gen Bamboo Touch do not contain useful
 425  * data. We deal with them after returning from this function.
 426  */
 427 static void wacom_usage_mapping(struct hid_device *hdev,
 428                 struct hid_field *field, struct hid_usage *usage)
 429 {
 430         struct wacom *wacom = hid_get_drvdata(hdev);
 431         struct wacom_features *features = &wacom->wacom_wac.features;
 432         bool finger = WACOM_FINGER_FIELD(field);
 433         bool pen = WACOM_PEN_FIELD(field);
 434         unsigned equivalent_usage = wacom_equivalent_usage(usage->hid);
 435
 436         /*
 437         * Requiring Stylus Usage will ignore boot mouse
 438         * X/Y values and some cases of invalid Digitizer X/Y
 439         * values commonly reported.
 440         */
 441         if (pen)
 442                 features->device_type |= WACOM_DEVICETYPE_PEN;
 443         else if (finger)
 444                 features->device_type |= WACOM_DEVICETYPE_TOUCH;
 445         else
 446                 return;
 447
 448         wacom_hid_usage_quirk(hdev, field, usage);
 449
 450         switch (equivalent_usage) {
 451         case HID_GD_X:
 452                 features->x_max = field->logical_maximum;
 453                 if (finger) {
 454                         features->x_phy = field->physical_maximum;
 455                         if ((features->type != BAMBOO_PT) &&
 456                             (features->type != BAMBOO_TOUCH)) {
 457                                 features->unit = field->unit;
 458                                 features->unitExpo = field->unit_exponent;
 459                         }
 460                 }
 461                 break;
 462         case HID_GD_Y:
 463                 features->y_max = field->logical_maximum;
 464                 if (finger) {
 465                         features->y_phy = field->physical_maximum;
 466                         if ((features->type != BAMBOO_PT) &&
 467                             (features->type != BAMBOO_TOUCH)) {
 468                                 features->unit = field->unit;
 469                                 features->unitExpo = field->unit_exponent;
 470                         }
 471                 }
 472                 break;
 473         case HID_DG_TIPPRESSURE:
 474                 if (pen)
 475                         features->pressure_max = field->logical_maximum;
 476                 break;
 477         }
 478
 479         if (features->type == HID_GENERIC)
 480                 wacom_wac_usage_mapping(hdev, field, usage);
 481 }
 482
 483 static void wacom_post_parse_hid(struct hid_device *hdev,
 484                                  struct wacom_features *features)
 485 {
 486         struct wacom *wacom = hid_get_drvdata(hdev);
 487         struct wacom_wac *wacom_wac = &wacom->wacom_wac;
 488
 489         if (features->type == HID_GENERIC) {
 490                 /* Any last-minute generic device setup */
 491                 if (wacom_wac->has_mode_change) {
 492                         if (wacom_wac->is_direct_mode)
 493                                 features->device_type |= WACOM_DEVICETYPE_DIRECT;
 494                         else
 495                                 features->device_type &= ~WACOM_DEVICETYPE_DIRECT;
 496                 }
 497
 498                 if (features->touch_max > 1) {
 499                         if (features->device_type & WACOM_DEVICETYPE_DIRECT)
 500                                 input_mt_init_slots(wacom_wac->touch_input,
 501                                                     wacom_wac->features.touch_max,
 502                                                     INPUT_MT_DIRECT);
 503                         else
 504                                 input_mt_init_slots(wacom_wac->touch_input,
 505                                                     wacom_wac->features.touch_max,
 506                                                     INPUT_MT_POINTER);
 507                 }
 508         }
 509 }
 510
 511 static void wacom_parse_hid(struct hid_device *hdev,
 512                            struct wacom_features *features)
 513 {
 514         struct hid_report_enum *rep_enum;
 515         struct hid_report *hreport;
 516         int i, j;
 517
 518         /* check features first */
 519         rep_enum = &hdev->report_enum[HID_FEATURE_REPORT];
 520         list_for_each_entry(hreport, &rep_enum->report_list, list) {
 521                 for (i = 0; i < hreport->maxfield; i++) {
 522                         /* Ignore if report count is out of bounds. */
 523                         if (hreport->field[i]->report_count < 1)
 524                                 continue;
 525
 526                         for (j = 0; j < hreport->field[i]->maxusage; j++) {
 527                                 wacom_feature_mapping(hdev, hreport->field[i],
 528                                                 hreport->field[i]->usage + j);
 529                         }
 530                 }
 531         }
 532
 533         /* now check the input usages */
 534         rep_enum = &hdev->report_enum[HID_INPUT_REPORT];
 535         list_for_each_entry(hreport, &rep_enum->report_list, list) {
 536
 537                 if (!hreport->maxfield)
 538                         continue;
 539
 540                 for (i = 0; i < hreport->maxfield; i++)
 541                         for (j = 0; j < hreport->field[i]->maxusage; j++)
 542                                 wacom_usage_mapping(hdev, hreport->field[i],
 543                                                 hreport->field[i]->usage + j);
 544         }
 545
 546         wacom_post_parse_hid(hdev, features);
 547 }
 548
 549 static int wacom_hid_set_device_mode(struct hid_device *hdev)
 550 {
 551         struct wacom *wacom = hid_get_drvdata(hdev);
 552         struct hid_data *hid_data = &wacom->wacom_wac.hid_data;
 553         struct hid_report *r;
 554         struct hid_report_enum *re;
 555
 556         if (hid_data->inputmode < 0)
 557                 return 0;
 558
 559         re = &(hdev->report_enum[HID_FEATURE_REPORT]);
 560         r = re->report_id_hash[hid_data->inputmode];
 561         if (r) {
 562                 r->field[0]->value[hid_data->inputmode_index] = 2;
 563                 hid_hw_request(hdev, r, HID_REQ_SET_REPORT);
 564         }
 565         return 0;
 566 }
 567
 568 static int wacom_set_device_mode(struct hid_device *hdev,
 569                                  struct wacom_wac *wacom_wac)
 570 {
 571         u8 *rep_data;
 572         struct hid_report *r;
 573         struct hid_report_enum *re;
 574         u32 length;
 575         int error = -ENOMEM, limit = 0;
 576
 577         if (wacom_wac->mode_report < 0)
 578                 return 0;
 579
 580         re = &(hdev->report_enum[HID_FEATURE_REPORT]);
 581         r = re->report_id_hash[wacom_wac->mode_report];
 582         if (!r)
 583                 return -EINVAL;
 584
 585         rep_data = hid_alloc_report_buf(r, GFP_KERNEL);
 586         if (!rep_data)
 587                 return -ENOMEM;
 588
 589         length = hid_report_len(r);
 590
 591         do {
 592                 rep_data[0] = wacom_wac->mode_report;
 593                 rep_data[1] = wacom_wac->mode_value;
 594
 595                 error = wacom_set_report(hdev, HID_FEATURE_REPORT, rep_data,
 596                                          length, 1);
 597                 if (error >= 0)
 598                         error = wacom_get_report(hdev, HID_FEATURE_REPORT,
 599                                                  rep_data, length, 1);
 600         } while (error >= 0 &&
 601                  rep_data[1] != wacom_wac->mode_report &&
 602                  limit++ < WAC_MSG_RETRIES);
 603
 604         kfree(rep_data);
 605
 606         return error < 0 ? error : 0;
 607 }
 608
 609 static int wacom_bt_query_tablet_data(struct hid_device *hdev, u8 speed,
 610                 struct wacom_features *features)
 611 {
 612         struct wacom *wacom = hid_get_drvdata(hdev);
 613         int ret;
 614         u8 rep_data[2];
 615
 616         switch (features->type) {
 617         case GRAPHIRE_BT:
 618                 rep_data[0] = 0x03;
 619                 rep_data[1] = 0x00;
 620                 ret = wacom_set_report(hdev, HID_FEATURE_REPORT, rep_data, 2,
 621                                         3);
 622
 623                 if (ret >= 0) {
 624                         rep_data[0] = speed == 0 ? 0x05 : 0x06;
 625                         rep_data[1] = 0x00;
 626
 627                         ret = wacom_set_report(hdev, HID_FEATURE_REPORT,
 628                                                 rep_data, 2, 3);
 629
 630                         if (ret >= 0) {
 631                                 wacom->wacom_wac.bt_high_speed = speed;
 632                                 return 0;
 633                         }
 634                 }
 635
 636                 /*
 637                  * Note that if the raw queries fail, it's not a hard failure
 638                  * and it is safe to continue
 639                  */
 640                 hid_warn(hdev, "failed to poke device, command %d, err %d\n",
 641                          rep_data[0], ret);
 642                 break;
 643         case INTUOS4WL:
 644                 if (speed == 1)
 645                         wacom->wacom_wac.bt_features &= ~0x20;
 646                 else
 647                         wacom->wacom_wac.bt_features |= 0x20;
 648
 649                 rep_data[0] = 0x03;
 650                 rep_data[1] = wacom->wacom_wac.bt_features;
 651
 652                 ret = wacom_set_report(hdev, HID_FEATURE_REPORT, rep_data, 2,
 653                                         1);
 654                 if (ret >= 0)
 655                         wacom->wacom_wac.bt_high_speed = speed;
 656                 break;
 657         }
 658
 659         return 0;
 660 }
 661
 662 /*
 663  * Switch the tablet into its most-capable mode. Wacom tablets are
 664  * typically configured to power-up in a mode which sends mouse-like
 665  * reports to the OS. To get absolute position, pressure data, etc.
 666  * from the tablet, it is necessary to switch the tablet out of this
 667  * mode and into one which sends the full range of tablet data.
 668  */
 669 static int _wacom_query_tablet_data(struct wacom *wacom)
 670 {
 671         struct hid_device *hdev = wacom->hdev;
 672         struct wacom_wac *wacom_wac = &wacom->wacom_wac;
 673         struct wacom_features *features = &wacom_wac->features;
 674
 675         if (hdev->bus == BUS_BLUETOOTH)
 676                 return wacom_bt_query_tablet_data(hdev, 1, features);
 677
 678         if (features->type != HID_GENERIC) {
 679                 if (features->device_type & WACOM_DEVICETYPE_TOUCH) {
 680                         if (features->type > TABLETPC) {
 681                                 /* MT Tablet PC touch */
 682                                 wacom_wac->mode_report = 3;
 683                                 wacom_wac->mode_value = 4;
 684                         } else if (features->type == WACOM_24HDT) {
 685                                 wacom_wac->mode_report = 18;
 686                                 wacom_wac->mode_value = 2;
 687                         } else if (features->type == WACOM_27QHDT) {
 688                                 wacom_wac->mode_report = 131;
 689                                 wacom_wac->mode_value = 2;
 690                         } else if (features->type == BAMBOO_PAD) {
 691                                 wacom_wac->mode_report = 2;
 692                                 wacom_wac->mode_value = 2;
 693                         }
 694                 } else if (features->device_type & WACOM_DEVICETYPE_PEN) {
 695                         if (features->type <= BAMBOO_PT) {
 696                                 wacom_wac->mode_report = 2;
 697                                 wacom_wac->mode_value = 2;
 698                         }
 699                 }
 700         }
 701
 702         wacom_set_device_mode(hdev, wacom_wac);
 703
 704         if (features->type == HID_GENERIC)
 705                 return wacom_hid_set_device_mode(hdev);
 706
 707         return 0;
 708 }
 709
 710 static void wacom_retrieve_hid_descriptor(struct hid_device *hdev,
 711                                          struct wacom_features *features)
 712 {
 713         struct wacom *wacom = hid_get_drvdata(hdev);
 714         struct usb_interface *intf = wacom->intf;
 715
 716         /* default features */
 717         features->x_fuzz = 4;
 718         features->y_fuzz = 4;
 719         features->pressure_fuzz = 0;
 720         features->distance_fuzz = 1;
 721         features->tilt_fuzz = 1;
 722
 723         /*
 724          * The wireless device HID is basic and layout conflicts with
 725          * other tablets (monitor and touch interface can look like pen).
 726          * Skip the query for this type and modify defaults based on
 727          * interface number.
 728          */
 729         if (features->type == WIRELESS) {
 730                 if (intf->cur_altsetting->desc.bInterfaceNumber == 0)
 731                         features->device_type = WACOM_DEVICETYPE_WL_MONITOR;
 732                 else
 733                         features->device_type = WACOM_DEVICETYPE_NONE;
 734                 return;
 735         }
 736
 737         wacom_parse_hid(hdev, features);
 738 }
 739
 740 struct wacom_hdev_data {
 741         struct list_head list;
 742         struct kref kref;
 743         struct hid_device *dev;
 744         struct wacom_shared shared;
 745 };
 746
 747 static LIST_HEAD(wacom_udev_list);
 748 static DEFINE_MUTEX(wacom_udev_list_lock);
 749
 750 static bool wacom_are_sibling(struct hid_device *hdev,
 751                 struct hid_device *sibling)
 752 {
 753         struct wacom *wacom = hid_get_drvdata(hdev);
 754         struct wacom_features *features = &wacom->wacom_wac.features;
 755         struct wacom *sibling_wacom = hid_get_drvdata(sibling);
 756         struct wacom_features *sibling_features = &sibling_wacom->wacom_wac.features;
 757         __u32 oVid = features->oVid ? features->oVid : hdev->vendor;
 758         __u32 oPid = features->oPid ? features->oPid : hdev->product;
 759
 760         /* The defined oVid/oPid must match that of the sibling */
 761         if (features->oVid != HID_ANY_ID && sibling->vendor != oVid)
 762                 return false;
 763         if (features->oPid != HID_ANY_ID && sibling->product != oPid)
 764                 return false;
 765
 766         /*
 767          * Devices with the same VID/PID must share the same physical
 768          * device path, while those with different VID/PID must share
 769          * the same physical parent device path.
 770          */
 771         if (hdev->vendor == sibling->vendor && hdev->product == sibling->product) {
 772                 if (!hid_compare_device_paths(hdev, sibling, '/'))
 773                         return false;
 774         } else {
 775                 if (!hid_compare_device_paths(hdev, sibling, '.'))
 776                         return false;
 777         }
 778
 779         /* Skip the remaining heuristics unless you are a HID_GENERIC device */
 780         if (features->type != HID_GENERIC)
 781                 return true;
 782
 783         /*
 784          * Direct-input devices may not be siblings of indirect-input
 785          * devices.
 786          */
 787         if ((features->device_type & WACOM_DEVICETYPE_DIRECT) &&
 788             !(sibling_features->device_type & WACOM_DEVICETYPE_DIRECT))
 789                 return false;
 790
 791         /*
 792          * Indirect-input devices may not be siblings of direct-input
 793          * devices.
 794          */
 795         if (!(features->device_type & WACOM_DEVICETYPE_DIRECT) &&
 796             (sibling_features->device_type & WACOM_DEVICETYPE_DIRECT))
 797                 return false;
 798
 799         /* Pen devices may only be siblings of touch devices */
 800         if ((features->device_type & WACOM_DEVICETYPE_PEN) &&
 801             !(sibling_features->device_type & WACOM_DEVICETYPE_TOUCH))
 802                 return false;
 803
 804         /* Touch devices may only be siblings of pen devices */
 805         if ((features->device_type & WACOM_DEVICETYPE_TOUCH) &&
 806             !(sibling_features->device_type & WACOM_DEVICETYPE_PEN))
 807                 return false;
 808
 809         /*
 810          * No reason could be found for these two devices to NOT be
 811          * siblings, so there's a good chance they ARE siblings
 812          */
 813         return true;
 814 }
 815
 816 static struct wacom_hdev_data *wacom_get_hdev_data(struct hid_device *hdev)
 817 {
 818         struct wacom_hdev_data *data;
 819
 820         /* Try to find an already-probed interface from the same device */
 821         list_for_each_entry(data, &wacom_udev_list, list) {
 822                 if (hid_compare_device_paths(hdev, data->dev, '/')) {
 823                         kref_get(&data->kref);
 824                         return data;
 825                 }
 826         }
 827
 828         /* Fallback to finding devices that appear to be "siblings" */
 829         list_for_each_entry(data, &wacom_udev_list, list) {
 830                 if (wacom_are_sibling(hdev, data->dev)) {
 831                         kref_get(&data->kref);
 832                         return data;
 833                 }
 834         }
 835
 836         return NULL;
 837 }
 838
 839 static void wacom_release_shared_data(struct kref *kref)
 840 {
 841         struct wacom_hdev_data *data =
 842                 container_of(kref, struct wacom_hdev_data, kref);
 843
 844         mutex_lock(&wacom_udev_list_lock);
 845         list_del(&data->list);
 846         mutex_unlock(&wacom_udev_list_lock);
 847
 848         kfree(data);
 849 }
 850
 851 static void wacom_remove_shared_data(void *res)
 852 {
 853         struct wacom *wacom = res;
 854         struct wacom_hdev_data *data;
 855         struct wacom_wac *wacom_wac = &wacom->wacom_wac;
 856
 857         if (wacom_wac->shared) {
 858                 data = container_of(wacom_wac->shared, struct wacom_hdev_data,
 859                                     shared);
 860
 861                 if (wacom_wac->shared->touch == wacom->hdev)
 862                         wacom_wac->shared->touch = NULL;
 863                 else if (wacom_wac->shared->pen == wacom->hdev)
 864                         wacom_wac->shared->pen = NULL;
 865
 866                 kref_put(&data->kref, wacom_release_shared_data);
 867                 wacom_wac->shared = NULL;
 868         }
 869 }
 870
 871 static int wacom_add_shared_data(struct hid_device *hdev)
 872 {
 873         struct wacom *wacom = hid_get_drvdata(hdev);
 874         struct wacom_wac *wacom_wac = &wacom->wacom_wac;
 875         struct wacom_hdev_data *data;
 876         int retval = 0;
 877
 878         mutex_lock(&wacom_udev_list_lock);
 879
 880         data = wacom_get_hdev_data(hdev);
 881         if (!data) {
 882                 data = kzalloc(sizeof(struct wacom_hdev_data), GFP_KERNEL);
 883                 if (!data) {
 884                         retval = -ENOMEM;
 885                         goto out;
 886                 }
 887
 888                 kref_init(&data->kref);
 889                 data->dev = hdev;
 890                 list_add_tail(&data->list, &wacom_udev_list);
 891         }
 892
 893         wacom_wac->shared = &data->shared;
 894
 895         retval = devm_add_action(&hdev->dev, wacom_remove_shared_data, wacom);
 896         if (retval) {
 897                 mutex_unlock(&wacom_udev_list_lock);
 898                 wacom_remove_shared_data(wacom);
 899                 return retval;
 900         }
 901
 902         if (wacom_wac->features.device_type & WACOM_DEVICETYPE_TOUCH)
 903                 wacom_wac->shared->touch = hdev;
 904         else if (wacom_wac->features.device_type & WACOM_DEVICETYPE_PEN)
 905                 wacom_wac->shared->pen = hdev;
 906
 907 out:
 908         mutex_unlock(&wacom_udev_list_lock);
 909         return retval;
 910 }
 911
 912 static int wacom_led_control(struct wacom *wacom)
 913 {
 914         unsigned char *buf;
 915         int retval;
 916         unsigned char report_id = WAC_CMD_LED_CONTROL;
 917         int buf_size = 9;
 918
 919         if (!wacom->led.groups)
 920                 return -ENOTSUPP;
 921
 922         if (wacom->wacom_wac.features.type == REMOTE)
 923                 return -ENOTSUPP;
 924
 925         if (wacom->wacom_wac.pid) { /* wireless connected */
 926                 report_id = WAC_CMD_WL_LED_CONTROL;
 927                 buf_size = 13;
 928         }
 929         else if (wacom->wacom_wac.features.type == INTUOSP2_BT) {
 930                 report_id = WAC_CMD_WL_INTUOSP2;
 931                 buf_size = 51;
 932         }
 933         buf = kzalloc(buf_size, GFP_KERNEL);
 934         if (!buf)
 935                 return -ENOMEM;
 936
 937         if (wacom->wacom_wac.features.type == HID_GENERIC) {
 938                 buf[0] = WAC_CMD_LED_CONTROL_GENERIC;
 939                 buf[1] = wacom->led.llv;
 940                 buf[2] = wacom->led.groups[0].select & 0x03;
 941
 942         } else if ((wacom->wacom_wac.features.type >= INTUOS5S &&
 943             wacom->wacom_wac.features.type <= INTUOSPL)) {
 944                 /*
 945                  * Touch Ring and crop mark LED luminance may take on
 946                  * one of four values:
 947                  *    0 = Low; 1 = Medium; 2 = High; 3 = Off
 948                  */
 949                 int ring_led = wacom->led.groups[0].select & 0x03;
 950                 int ring_lum = (((wacom->led.llv & 0x60) >> 5) - 1) & 0x03;
 951                 int crop_lum = 0;
 952                 unsigned char led_bits = (crop_lum << 4) | (ring_lum << 2) | (ring_led);
 953
 954                 buf[0] = report_id;
 955                 if (wacom->wacom_wac.pid) {
 956                         wacom_get_report(wacom->hdev, HID_FEATURE_REPORT,
 957                                          buf, buf_size, WAC_CMD_RETRIES);
 958                         buf[0] = report_id;
 959                         buf[4] = led_bits;
 960                 } else
 961                         buf[1] = led_bits;
 962         }
 963         else if (wacom->wacom_wac.features.type == INTUOSP2_BT) {
 964                 buf[0] = report_id;
 965                 buf[4] = 100; // Power Connection LED (ORANGE)
 966                 buf[5] = 100; // BT Connection LED (BLUE)
 967                 buf[6] = 100; // Paper Mode (RED?)
 968                 buf[7] = 100; // Paper Mode (GREEN?)
 969                 buf[8] = 100; // Paper Mode (BLUE?)
 970                 buf[9] = wacom->led.llv;
 971                 buf[10] = wacom->led.groups[0].select & 0x03;
 972         }
 973         else {
 974                 int led = wacom->led.groups[0].select | 0x4;
 975
 976                 if (wacom->wacom_wac.features.type == WACOM_21UX2 ||
 977                     wacom->wacom_wac.features.type == WACOM_24HD)
 978                         led |= (wacom->led.groups[1].select << 4) | 0x40;
 979
 980                 buf[0] = report_id;
 981                 buf[1] = led;
 982                 buf[2] = wacom->led.llv;
 983                 buf[3] = wacom->led.hlv;
 984                 buf[4] = wacom->led.img_lum;
 985         }
 986
 987         retval = wacom_set_report(wacom->hdev, HID_FEATURE_REPORT, buf, buf_size,
 988                                   WAC_CMD_RETRIES);
 989         kfree(buf);
 990
 991         return retval;
 992 }
 993
 994 static int wacom_led_putimage(struct wacom *wacom, int button_id, u8 xfer_id,
 995                 const unsigned len, const void *img)
 996 {
 997         unsigned char *buf;
 998         int i, retval;
 999         const unsigned chunk_len = len / 4; /* 4 chunks are needed to be sent */
1000
1001         buf = kzalloc(chunk_len + 3 , GFP_KERNEL);
1002         if (!buf)
1003                 return -ENOMEM;
1004
1005         /* Send 'start' command */
1006         buf[0] = WAC_CMD_ICON_START;
1007         buf[1] = 1;
1008         retval = wacom_set_report(wacom->hdev, HID_FEATURE_REPORT, buf, 2,
1009                                   WAC_CMD_RETRIES);
1010         if (retval < 0)
1011                 goto out;
1012
1013         buf[0] = xfer_id;
1014         buf[1] = button_id & 0x07;
1015         for (i = 0; i < 4; i++) {
1016                 buf[2] = i;
1017                 memcpy(buf + 3, img + i * chunk_len, chunk_len);
1018
1019                 retval = wacom_set_report(wacom->hdev, HID_FEATURE_REPORT,
1020                                           buf, chunk_len + 3, WAC_CMD_RETRIES);
1021                 if (retval < 0)
1022                         break;
1023         }
1024
1025         /* Send 'stop' */
1026         buf[0] = WAC_CMD_ICON_START;
1027         buf[1] = 0;
1028         wacom_set_report(wacom->hdev, HID_FEATURE_REPORT, buf, 2,
1029                          WAC_CMD_RETRIES);
1030
1031 out:
1032         kfree(buf);
1033         return retval;
1034 }
1035
1036 static ssize_t wacom_led_select_store(struct device *dev, int set_id,
1037                                       const char *buf, size_t count)
1038 {
1039         struct hid_device *hdev = to_hid_device(dev);
1040         struct wacom *wacom = hid_get_drvdata(hdev);
1041         unsigned int id;
1042         int err;
1043
1044         err = kstrtouint(buf, 10, &id);
1045         if (err)
1046                 return err;
1047
1048         mutex_lock(&wacom->lock);
1049
1050         wacom->led.groups[set_id].select = id & 0x3;
1051         err = wacom_led_control(wacom);
1052
1053         mutex_unlock(&wacom->lock);
1054
1055         return err < 0 ? err : count;
1056 }
1057
1058 #define DEVICE_LED_SELECT_ATTR(SET_ID)                                  \
1059 static ssize_t wacom_led##SET_ID##_select_store(struct device *dev,     \
1060         struct device_attribute *attr, const char *buf, size_t count)   \
1061 {                                                                       \
1062         return wacom_led_select_store(dev, SET_ID, buf, count);         \
1063 }                                                                       \
1064 static ssize_t wacom_led##SET_ID##_select_show(struct device *dev,      \
1065         struct device_attribute *attr, char *buf)                       \
1066 {                                                                       \
1067         struct hid_device *hdev = to_hid_device(dev);\
1068         struct wacom *wacom = hid_get_drvdata(hdev);                    \
1069         return scnprintf(buf, PAGE_SIZE, "%d\n",                        \
1070                          wacom->led.groups[SET_ID].select);             \
1071 }                                                                       \
1072 static DEVICE_ATTR(status_led##SET_ID##_select, DEV_ATTR_RW_PERM,       \
1073                     wacom_led##SET_ID##_select_show,                    \
1074                     wacom_led##SET_ID##_select_store)
1075
1076 DEVICE_LED_SELECT_ATTR(0);
1077 DEVICE_LED_SELECT_ATTR(1);
1078
1079 static ssize_t wacom_luminance_store(struct wacom *wacom, u8 *dest,
1080                                      const char *buf, size_t count)
1081 {
1082         unsigned int value;
1083         int err;
1084
1085         err = kstrtouint(buf, 10, &value);
1086         if (err)
1087                 return err;
1088
1089         mutex_lock(&wacom->lock);
1090
1091         *dest = value & 0x7f;
1092         err = wacom_led_control(wacom);
1093
1094         mutex_unlock(&wacom->lock);
1095
1096         return err < 0 ? err : count;
1097 }
1098
1099 #define DEVICE_LUMINANCE_ATTR(name, field)                              \
1100 static ssize_t wacom_##name##_luminance_store(struct device *dev,       \
1101         struct device_attribute *attr, const char *buf, size_t count)   \
1102 {                                                                       \
1103         struct hid_device *hdev = to_hid_device(dev);\
1104         struct wacom *wacom = hid_get_drvdata(hdev);                    \
1105                                                                         \
1106         return wacom_luminance_store(wacom, &wacom->led.field,          \
1107                                      buf, count);                       \
1108 }                                                                       \
1109 static ssize_t wacom_##name##_luminance_show(struct device *dev,        \
1110         struct device_attribute *attr, char *buf)                       \
1111 {                                                                       \
1112         struct wacom *wacom = dev_get_drvdata(dev);                     \
1113         return scnprintf(buf, PAGE_SIZE, "%d\n", wacom->led.field);     \
1114 }                                                                       \
1115 static DEVICE_ATTR(name##_luminance, DEV_ATTR_RW_PERM,                  \
1116                    wacom_##name##_luminance_show,                       \
1117                    wacom_##name##_luminance_store)
1118
1119 DEVICE_LUMINANCE_ATTR(status0, llv);
1120 DEVICE_LUMINANCE_ATTR(status1, hlv);
1121 DEVICE_LUMINANCE_ATTR(buttons, img_lum);
1122
1123 static ssize_t wacom_button_image_store(struct device *dev, int button_id,
1124                                         const char *buf, size_t count)
1125 {
1126         struct hid_device *hdev = to_hid_device(dev);
1127         struct wacom *wacom = hid_get_drvdata(hdev);
1128         int err;
1129         unsigned len;
1130         u8 xfer_id;
1131
1132         if (hdev->bus == BUS_BLUETOOTH) {
1133                 len = 256;
1134                 xfer_id = WAC_CMD_ICON_BT_XFER;
1135         } else {
1136                 len = 1024;
1137                 xfer_id = WAC_CMD_ICON_XFER;
1138         }
1139
1140         if (count != len)
1141                 return -EINVAL;
1142
1143         mutex_lock(&wacom->lock);
1144
1145         err = wacom_led_putimage(wacom, button_id, xfer_id, len, buf);
1146
1147         mutex_unlock(&wacom->lock);
1148
1149         return err < 0 ? err : count;
1150 }
1151
1152 #define DEVICE_BTNIMG_ATTR(BUTTON_ID)                                   \
1153 static ssize_t wacom_btnimg##BUTTON_ID##_store(struct device *dev,      \
1154         struct device_attribute *attr, const char *buf, size_t count)   \
1155 {                                                                       \
1156         return wacom_button_image_store(dev, BUTTON_ID, buf, count);    \
1157 }                                                                       \
1158 static DEVICE_ATTR(button##BUTTON_ID##_rawimg, DEV_ATTR_WO_PERM,        \
1159                    NULL, wacom_btnimg##BUTTON_ID##_store)
1160
1161 DEVICE_BTNIMG_ATTR(0);
1162 DEVICE_BTNIMG_ATTR(1);
1163 DEVICE_BTNIMG_ATTR(2);
1164 DEVICE_BTNIMG_ATTR(3);
1165 DEVICE_BTNIMG_ATTR(4);
1166 DEVICE_BTNIMG_ATTR(5);
1167 DEVICE_BTNIMG_ATTR(6);
1168 DEVICE_BTNIMG_ATTR(7);
1169
1170 static struct attribute *cintiq_led_attrs[] = {
1171         &dev_attr_status_led0_select.attr,
1172         &dev_attr_status_led1_select.attr,
1173         NULL
1174 };
1175
1176 static const struct attribute_group cintiq_led_attr_group = {
1177         .name = "wacom_led",
1178         .attrs = cintiq_led_attrs,
1179 };
1180
1181 static struct attribute *intuos4_led_attrs[] = {
1182         &dev_attr_status0_luminance.attr,
1183         &dev_attr_status1_luminance.attr,
1184         &dev_attr_status_led0_select.attr,
1185         &dev_attr_buttons_luminance.attr,
1186         &dev_attr_button0_rawimg.attr,
1187         &dev_attr_button1_rawimg.attr,
1188         &dev_attr_button2_rawimg.attr,
1189         &dev_attr_button3_rawimg.attr,
1190         &dev_attr_button4_rawimg.attr,
1191         &dev_attr_button5_rawimg.attr,
1192         &dev_attr_button6_rawimg.attr,
1193         &dev_attr_button7_rawimg.attr,
1194         NULL
1195 };
1196
1197 static const struct attribute_group intuos4_led_attr_group = {
1198         .name = "wacom_led",
1199         .attrs = intuos4_led_attrs,
1200 };
1201
1202 static struct attribute *intuos5_led_attrs[] = {
1203         &dev_attr_status0_luminance.attr,
1204         &dev_attr_status_led0_select.attr,
1205         NULL
1206 };
1207
1208 static const struct attribute_group intuos5_led_attr_group = {
1209         .name = "wacom_led",
1210         .attrs = intuos5_led_attrs,
1211 };
1212
1213 static struct attribute *generic_led_attrs[] = {
1214         &dev_attr_status0_luminance.attr,
1215         &dev_attr_status_led0_select.attr,
1216         NULL
1217 };
1218
1219 static const struct attribute_group generic_led_attr_group = {
1220         .name = "wacom_led",
1221         .attrs = generic_led_attrs,
1222 };
1223
1224 struct wacom_sysfs_group_devres {
1225         const struct attribute_group *group;
1226         struct kobject *root;
1227 };
1228
1229 static void wacom_devm_sysfs_group_release(struct device *dev, void *res)
1230 {
1231         struct wacom_sysfs_group_devres *devres = res;
1232         struct kobject *kobj = devres->root;
1233
1234         dev_dbg(dev, "%s: dropping reference to %s\n",
1235                 __func__, devres->group->name);
1236         sysfs_remove_group(kobj, devres->group);
1237 }
1238
1239 static int __wacom_devm_sysfs_create_group(struct wacom *wacom,
1240                                            struct kobject *root,
1241                                            const struct attribute_group *group)
1242 {
1243         struct wacom_sysfs_group_devres *devres;
1244         int error;
1245
1246         devres = devres_alloc(wacom_devm_sysfs_group_release,
1247                               sizeof(struct wacom_sysfs_group_devres),
1248                               GFP_KERNEL);
1249         if (!devres)
1250                 return -ENOMEM;
1251
1252         devres->group = group;
1253         devres->root = root;
1254
1255         error = sysfs_create_group(devres->root, group);
1256         if (error) {
1257                 devres_free(devres);
1258                 return error;
1259         }
1260
1261         devres_add(&wacom->hdev->dev, devres);
1262
1263         return 0;
1264 }
1265
1266 static int wacom_devm_sysfs_create_group(struct wacom *wacom,
1267                                          const struct attribute_group *group)
1268 {
1269         return __wacom_devm_sysfs_create_group(wacom, &wacom->hdev->dev.kobj,
1270                                                group);
1271 }
1272
1273 static void wacom_devm_kfifo_release(struct device *dev, void *res)
1274 {
1275         struct kfifo_rec_ptr_2 *devres = res;
1276
1277         kfifo_free(devres);
1278 }
1279
1280 static int wacom_devm_kfifo_alloc(struct wacom *wacom)
1281 {
1282         struct wacom_wac *wacom_wac = &wacom->wacom_wac;
1283         struct kfifo_rec_ptr_2 *pen_fifo;
1284         int error;
1285
1286         pen_fifo = devres_alloc(wacom_devm_kfifo_release,
1287                               sizeof(struct kfifo_rec_ptr_2),
1288                               GFP_KERNEL);
1289
1290         if (!pen_fifo)
1291                 return -ENOMEM;
1292
1293         error = kfifo_alloc(pen_fifo, WACOM_PKGLEN_MAX, GFP_KERNEL);
1294         if (error) {
1295                 devres_free(pen_fifo);
1296                 return error;
1297         }
1298
1299         devres_add(&wacom->hdev->dev, pen_fifo);
1300         wacom_wac->pen_fifo = pen_fifo;
1301
1302         return 0;
1303 }
1304
1305 enum led_brightness wacom_leds_brightness_get(struct wacom_led *led)
1306 {
1307         struct wacom *wacom = led->wacom;
1308
1309         if (wacom->led.max_hlv)
1310                 return led->hlv * LED_FULL / wacom->led.max_hlv;
1311
1312         if (wacom->led.max_llv)
1313                 return led->llv * LED_FULL / wacom->led.max_llv;
1314
1315         /* device doesn't support brightness tuning */
1316         return LED_FULL;
1317 }
1318
1319 static enum led_brightness __wacom_led_brightness_get(struct led_classdev *cdev)
1320 {
1321         struct wacom_led *led = container_of(cdev, struct wacom_led, cdev);
1322         struct wacom *wacom = led->wacom;
1323
1324         if (wacom->led.groups[led->group].select != led->id)
1325                 return LED_OFF;
1326
1327         return wacom_leds_brightness_get(led);
1328 }
1329
1330 static int wacom_led_brightness_set(struct led_classdev *cdev,
1331                                     enum led_brightness brightness)
1332 {
1333         struct wacom_led *led = container_of(cdev, struct wacom_led, cdev);
1334         struct wacom *wacom = led->wacom;
1335         int error;
1336
1337         mutex_lock(&wacom->lock);
1338
1339         if (!wacom->led.groups || (brightness == LED_OFF &&
1340             wacom->led.groups[led->group].select != led->id)) {
1341                 error = 0;
1342                 goto out;
1343         }
1344
1345         led->llv = wacom->led.llv = wacom->led.max_llv * brightness / LED_FULL;
1346         led->hlv = wacom->led.hlv = wacom->led.max_hlv * brightness / LED_FULL;
1347
1348         wacom->led.groups[led->group].select = led->id;
1349
1350         error = wacom_led_control(wacom);
1351
1352 out:
1353         mutex_unlock(&wacom->lock);
1354
1355         return error;
1356 }
1357
1358 static void wacom_led_readonly_brightness_set(struct led_classdev *cdev,
1359                                                enum led_brightness brightness)
1360 {
1361 }
1362
1363 static int wacom_led_register_one(struct device *dev, struct wacom *wacom,
1364                                   struct wacom_led *led, unsigned int group,
1365                                   unsigned int id, bool read_only)
1366 {
1367         int error;
1368         char *name;
1369
1370         name = devm_kasprintf(dev, GFP_KERNEL,
1371                               "%s::wacom-%d.%d",
1372                               dev_name(dev),
1373                               group,
1374                               id);
1375         if (!name)
1376                 return -ENOMEM;
1377
1378         if (!read_only) {
1379                 led->trigger.name = name;
1380                 error = devm_led_trigger_register(dev, &led->trigger);
1381                 if (error) {
1382                         hid_err(wacom->hdev,
1383                                 "failed to register LED trigger %s: %d\n",
1384                                 led->cdev.name, error);
1385                         return error;
1386                 }
1387         }
1388
1389         led->group = group;
1390         led->id = id;
1391         led->wacom = wacom;
1392         led->llv = wacom->led.llv;
1393         led->hlv = wacom->led.hlv;
1394         led->cdev.name = name;
1395         led->cdev.max_brightness = LED_FULL;
1396         led->cdev.flags = LED_HW_PLUGGABLE;
1397         led->cdev.brightness_get = __wacom_led_brightness_get;
1398         if (!read_only) {
1399                 led->cdev.brightness_set_blocking = wacom_led_brightness_set;
1400                 led->cdev.default_trigger = led->cdev.name;
1401         } else {
1402                 led->cdev.brightness_set = wacom_led_readonly_brightness_set;
1403         }
1404
1405         error = devm_led_classdev_register(dev, &led->cdev);
1406         if (error) {
1407                 hid_err(wacom->hdev,
1408                         "failed to register LED %s: %d\n",
1409                         led->cdev.name, error);
1410                 led->cdev.name = NULL;
1411                 return error;
1412         }
1413
1414         return 0;
1415 }
1416
1417 static void wacom_led_groups_release_one(void *data)
1418 {
1419         struct wacom_group_leds *group = data;
1420
1421         devres_release_group(group->dev, group);
1422 }
1423
1424 static int wacom_led_groups_alloc_and_register_one(struct device *dev,
1425                                                    struct wacom *wacom,
1426                                                    int group_id, int count,
1427                                                    bool read_only)
1428 {
1429         struct wacom_led *leds;
1430         int i, error;
1431
1432         if (group_id >= wacom->led.count || count <= 0)
1433                 return -EINVAL;
1434
1435         if (!devres_open_group(dev, &wacom->led.groups[group_id], GFP_KERNEL))
1436                 return -ENOMEM;
1437
1438         leds = devm_kcalloc(dev, count, sizeof(struct wacom_led), GFP_KERNEL);
1439         if (!leds) {
1440                 error = -ENOMEM;
1441                 goto err;
1442         }
1443
1444         wacom->led.groups[group_id].leds = leds;
1445         wacom->led.groups[group_id].count = count;
1446
1447         for (i = 0; i < count; i++) {
1448                 error = wacom_led_register_one(dev, wacom, &leds[i],
1449                                                group_id, i, read_only);
1450                 if (error)
1451                         goto err;
1452         }
1453
1454         wacom->led.groups[group_id].dev = dev;
1455
1456         devres_close_group(dev, &wacom->led.groups[group_id]);
1457
1458         /*
1459          * There is a bug (?) in devm_led_classdev_register() in which its
1460          * increments the refcount of the parent. If the parent is an input
1461          * device, that means the ref count never reaches 0 when
1462          * devm_input_device_release() gets called.
1463          * This means that the LEDs are still there after disconnect.
1464          * Manually force the release of the group so that the leds are released
1465          * once we are done using them.
1466          */
1467         error = devm_add_action_or_reset(&wacom->hdev->dev,
1468                                          wacom_led_groups_release_one,
1469                                          &wacom->led.groups[group_id]);
1470         if (error)
1471                 return error;
1472
1473         return 0;
1474
1475 err:
1476         devres_release_group(dev, &wacom->led.groups[group_id]);
1477         return error;
1478 }
1479
1480 struct wacom_led *wacom_led_find(struct wacom *wacom, unsigned int group_id,
1481                                  unsigned int id)
1482 {
1483         struct wacom_group_leds *group;
1484
1485         if (group_id >= wacom->led.count)
1486                 return NULL;
1487
1488         group = &wacom->led.groups[group_id];
1489
1490         if (!group->leds)
1491                 return NULL;
1492
1493         id %= group->count;
1494
1495         return &group->leds[id];
1496 }
1497
1498 /*
1499  * wacom_led_next: gives the next available led with a wacom trigger.
1500  *
1501  * returns the next available struct wacom_led which has its default trigger
1502  * or the current one if none is available.
1503  */
1504 struct wacom_led *wacom_led_next(struct wacom *wacom, struct wacom_led *cur)
1505 {
1506         struct wacom_led *next_led;
1507         int group, next;
1508
1509         if (!wacom || !cur)
1510                 return NULL;
1511
1512         group = cur->group;
1513         next = cur->id;
1514
1515         do {
1516                 next_led = wacom_led_find(wacom, group, ++next);
1517                 if (!next_led || next_led == cur)
1518                         return next_led;
1519         } while (next_led->cdev.trigger != &next_led->trigger);
1520
1521         return next_led;
1522 }
1523
1524 static void wacom_led_groups_release(void *data)
1525 {
1526         struct wacom *wacom = data;
1527
1528         wacom->led.groups = NULL;
1529         wacom->led.count = 0;
1530 }
1531
1532 static int wacom_led_groups_allocate(struct wacom *wacom, int count)
1533 {
1534         struct device *dev = &wacom->hdev->dev;
1535         struct wacom_group_leds *groups;
1536         int error;
1537
1538         groups = devm_kcalloc(dev, count, sizeof(struct wacom_group_leds),
1539                               GFP_KERNEL);
1540         if (!groups)
1541                 return -ENOMEM;
1542
1543         error = devm_add_action_or_reset(dev, wacom_led_groups_release, wacom);
1544         if (error)
1545                 return error;
1546
1547         wacom->led.groups = groups;
1548         wacom->led.count = count;
1549
1550         return 0;
1551 }
1552
1553 static int wacom_leds_alloc_and_register(struct wacom *wacom, int group_count,
1554                                          int led_per_group, bool read_only)
1555 {
1556         struct device *dev;
1557         int i, error;
1558
1559         if (!wacom->wacom_wac.pad_input)
1560                 return -EINVAL;
1561
1562         dev = &wacom->wacom_wac.pad_input->dev;
1563
1564         error = wacom_led_groups_allocate(wacom, group_count);
1565         if (error)
1566                 return error;
1567
1568         for (i = 0; i < group_count; i++) {
1569                 error = wacom_led_groups_alloc_and_register_one(dev, wacom, i,
1570                                                                 led_per_group,
1571                                                                 read_only);
1572                 if (error)
1573                         return error;
1574         }
1575
1576         return 0;
1577 }
1578
1579 int wacom_initialize_leds(struct wacom *wacom)
1580 {
1581         int error;
1582
1583         if (!(wacom->wacom_wac.features.device_type & WACOM_DEVICETYPE_PAD))
1584                 return 0;
1585
1586         /* Initialize default values */
1587         switch (wacom->wacom_wac.features.type) {
1588         case HID_GENERIC:
1589                 if (!wacom->generic_has_leds)
1590                         return 0;
1591                 wacom->led.llv = 100;
1592                 wacom->led.max_llv = 100;
1593
1594                 error = wacom_leds_alloc_and_register(wacom, 1, 4, false);
1595                 if (error) {
1596                         hid_err(wacom->hdev,
1597                                 "cannot create leds err: %d\n", error);
1598                         return error;
1599                 }
1600
1601                 error = wacom_devm_sysfs_create_group(wacom,
1602                                                       &generic_led_attr_group);
1603                 break;
1604
1605         case INTUOS4S:
1606         case INTUOS4:
1607         case INTUOS4WL:
1608         case INTUOS4L:
1609                 wacom->led.llv = 10;
1610                 wacom->led.hlv = 20;
1611                 wacom->led.max_llv = 127;
1612                 wacom->led.max_hlv = 127;
1613                 wacom->led.img_lum = 10;
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                                                       &intuos4_led_attr_group);
1624                 break;
1625
1626         case WACOM_24HD:
1627         case WACOM_21UX2:
1628                 wacom->led.llv = 0;
1629                 wacom->led.hlv = 0;
1630                 wacom->led.img_lum = 0;
1631
1632                 error = wacom_leds_alloc_and_register(wacom, 2, 4, false);
1633                 if (error) {
1634                         hid_err(wacom->hdev,
1635                                 "cannot create leds err: %d\n", error);
1636                         return error;
1637                 }
1638
1639                 error = wacom_devm_sysfs_create_group(wacom,
1640                                                       &cintiq_led_attr_group);
1641                 break;
1642
1643         case INTUOS5S:
1644         case INTUOS5:
1645         case INTUOS5L:
1646         case INTUOSPS:
1647         case INTUOSPM:
1648         case INTUOSPL:
1649                 wacom->led.llv = 32;
1650                 wacom->led.max_llv = 96;
1651
1652                 error = wacom_leds_alloc_and_register(wacom, 1, 4, false);
1653                 if (error) {
1654                         hid_err(wacom->hdev,
1655                                 "cannot create leds err: %d\n", error);
1656                         return error;
1657                 }
1658
1659                 error = wacom_devm_sysfs_create_group(wacom,
1660                                                       &intuos5_led_attr_group);
1661                 break;
1662
1663         case INTUOSP2_BT:
1664                 wacom->led.llv = 50;
1665                 wacom->led.max_llv = 100;
1666                 error = wacom_leds_alloc_and_register(wacom, 1, 4, false);
1667                 if (error) {
1668                         hid_err(wacom->hdev,
1669                                 "cannot create leds err: %d\n", error);
1670                         return error;
1671                 }
1672                 return 0;
1673
1674         case REMOTE:
1675                 wacom->led.llv = 255;
1676                 wacom->led.max_llv = 255;
1677                 error = wacom_led_groups_allocate(wacom, 5);
1678                 if (error) {
1679                         hid_err(wacom->hdev,
1680                                 "cannot create leds err: %d\n", error);
1681                         return error;
1682                 }
1683                 return 0;
1684
1685         default:
1686                 return 0;
1687         }
1688
1689         if (error) {
1690                 hid_err(wacom->hdev,
1691                         "cannot create sysfs group err: %d\n", error);
1692                 return error;
1693         }
1694
1695         return 0;
1696 }
1697
1698 static void wacom_init_work(struct work_struct *work)
1699 {
1700         struct wacom *wacom = container_of(work, struct wacom, init_work.work);
1701
1702         _wacom_query_tablet_data(wacom);
1703         wacom_led_control(wacom);
1704 }
1705
1706 static void wacom_query_tablet_data(struct wacom *wacom)
1707 {
1708         schedule_delayed_work(&wacom->init_work, msecs_to_jiffies(1000));
1709 }
1710
1711 static enum power_supply_property wacom_battery_props[] = {
1712         POWER_SUPPLY_PROP_MODEL_NAME,
1713         POWER_SUPPLY_PROP_PRESENT,
1714         POWER_SUPPLY_PROP_STATUS,
1715         POWER_SUPPLY_PROP_SCOPE,
1716         POWER_SUPPLY_PROP_CAPACITY
1717 };
1718
1719 static int wacom_battery_get_property(struct power_supply *psy,
1720                                       enum power_supply_property psp,
1721                                       union power_supply_propval *val)
1722 {
1723         struct wacom_battery *battery = power_supply_get_drvdata(psy);
1724         int ret = 0;
1725
1726         switch (psp) {
1727                 case POWER_SUPPLY_PROP_MODEL_NAME:
1728                         val->strval = battery->wacom->wacom_wac.name;
1729                         break;
1730                 case POWER_SUPPLY_PROP_PRESENT:
1731                         val->intval = battery->bat_connected;
1732                         break;
1733                 case POWER_SUPPLY_PROP_SCOPE:
1734                         val->intval = POWER_SUPPLY_SCOPE_DEVICE;
1735                         break;
1736                 case POWER_SUPPLY_PROP_CAPACITY:
1737                         val->intval = battery->battery_capacity;
1738                         break;
1739                 case POWER_SUPPLY_PROP_STATUS:
1740                         if (battery->bat_status != WACOM_POWER_SUPPLY_STATUS_AUTO)
1741                                 val->intval = battery->bat_status;
1742                         else if (battery->bat_charging)
1743                                 val->intval = POWER_SUPPLY_STATUS_CHARGING;
1744                         else if (battery->battery_capacity == 100 &&
1745                                     battery->ps_connected)
1746                                 val->intval = POWER_SUPPLY_STATUS_FULL;
1747                         else if (battery->ps_connected)
1748                                 val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING;
1749                         else
1750                                 val->intval = POWER_SUPPLY_STATUS_DISCHARGING;
1751                         break;
1752                 default:
1753                         ret = -EINVAL;
1754                         break;
1755         }
1756
1757         return ret;
1758 }
1759
1760 static int __wacom_initialize_battery(struct wacom *wacom,
1761                                       struct wacom_battery *battery)
1762 {
1763         static atomic_t battery_no = ATOMIC_INIT(0);
1764         struct device *dev = &wacom->hdev->dev;
1765         struct power_supply_config psy_cfg = { .drv_data = battery, };
1766         struct power_supply *ps_bat;
1767         struct power_supply_desc *bat_desc = &battery->bat_desc;
1768         unsigned long n;
1769         int error;
1770
1771         if (!devres_open_group(dev, bat_desc, GFP_KERNEL))
1772                 return -ENOMEM;
1773
1774         battery->wacom = wacom;
1775
1776         n = atomic_inc_return(&battery_no) - 1;
1777
1778         bat_desc->properties = wacom_battery_props;
1779         bat_desc->num_properties = ARRAY_SIZE(wacom_battery_props);
1780         bat_desc->get_property = wacom_battery_get_property;
1781         sprintf(battery->bat_name, "wacom_battery_%ld", n);
1782         bat_desc->name = battery->bat_name;
1783         bat_desc->type = POWER_SUPPLY_TYPE_USB;
1784         bat_desc->use_for_apm = 0;
1785
1786         ps_bat = devm_power_supply_register(dev, bat_desc, &psy_cfg);
1787         if (IS_ERR(ps_bat)) {
1788                 error = PTR_ERR(ps_bat);
1789                 goto err;
1790         }
1791
1792         power_supply_powers(ps_bat, &wacom->hdev->dev);
1793
1794         battery->battery = ps_bat;
1795
1796         devres_close_group(dev, bat_desc);
1797         return 0;
1798
1799 err:
1800         devres_release_group(dev, bat_desc);
1801         return error;
1802 }
1803
1804 static int wacom_initialize_battery(struct wacom *wacom)
1805 {
1806         if (wacom->wacom_wac.features.quirks & WACOM_QUIRK_BATTERY)
1807                 return __wacom_initialize_battery(wacom, &wacom->battery);
1808
1809         return 0;
1810 }
1811
1812 static void wacom_destroy_battery(struct wacom *wacom)
1813 {
1814         if (wacom->battery.battery) {
1815                 devres_release_group(&wacom->hdev->dev,
1816                                      &wacom->battery.bat_desc);
1817                 wacom->battery.battery = NULL;
1818         }
1819 }
1820
1821 static ssize_t wacom_show_speed(struct device *dev,
1822                                 struct device_attribute
1823                                 *attr, char *buf)
1824 {
1825         struct hid_device *hdev = to_hid_device(dev);
1826         struct wacom *wacom = hid_get_drvdata(hdev);
1827
1828         return sysfs_emit(buf, "%i\n", wacom->wacom_wac.bt_high_speed);
1829 }
1830
1831 static ssize_t wacom_store_speed(struct device *dev,
1832                                 struct device_attribute *attr,
1833                                 const char *buf, size_t count)
1834 {
1835         struct hid_device *hdev = to_hid_device(dev);
1836         struct wacom *wacom = hid_get_drvdata(hdev);
1837         u8 new_speed;
1838
1839         if (kstrtou8(buf, 0, &new_speed))
1840                 return -EINVAL;
1841
1842         if (new_speed != 0 && new_speed != 1)
1843                 return -EINVAL;
1844
1845         wacom_bt_query_tablet_data(hdev, new_speed, &wacom->wacom_wac.features);
1846
1847         return count;
1848 }
1849
1850 static DEVICE_ATTR(speed, DEV_ATTR_RW_PERM,
1851                 wacom_show_speed, wacom_store_speed);
1852
1853
1854 static ssize_t wacom_show_remote_mode(struct kobject *kobj,
1855                                       struct kobj_attribute *kattr,
1856                                       char *buf, int index)
1857 {
1858         struct device *dev = kobj_to_dev(kobj->parent);
1859         struct hid_device *hdev = to_hid_device(dev);
1860         struct wacom *wacom = hid_get_drvdata(hdev);
1861         u8 mode;
1862
1863         mode = wacom->led.groups[index].select;
1864         return sprintf(buf, "%d\n", mode < 3 ? mode : -1);
1865 }
1866
1867 #define DEVICE_EKR_ATTR_GROUP(SET_ID)                                   \
1868 static ssize_t wacom_show_remote##SET_ID##_mode(struct kobject *kobj,   \
1869                                struct kobj_attribute *kattr, char *buf) \
1870 {                                                                       \
1871         return wacom_show_remote_mode(kobj, kattr, buf, SET_ID);        \
1872 }                                                                       \
1873 static struct kobj_attribute remote##SET_ID##_mode_attr = {             \
1874         .attr = {.name = "remote_mode",                                 \
1875                 .mode = DEV_ATTR_RO_PERM},                              \
1876         .show = wacom_show_remote##SET_ID##_mode,                       \
1877 };                                                                      \
1878 static struct attribute *remote##SET_ID##_serial_attrs[] = {            \
1879         &remote##SET_ID##_mode_attr.attr,                               \
1880         NULL                                                            \
1881 };                                                                      \
1882 static const struct attribute_group remote##SET_ID##_serial_group = {   \
1883         .name = NULL,                                                   \
1884         .attrs = remote##SET_ID##_serial_attrs,                         \
1885 }
1886
1887 DEVICE_EKR_ATTR_GROUP(0);
1888 DEVICE_EKR_ATTR_GROUP(1);
1889 DEVICE_EKR_ATTR_GROUP(2);
1890 DEVICE_EKR_ATTR_GROUP(3);
1891 DEVICE_EKR_ATTR_GROUP(4);
1892
1893 static int wacom_remote_create_attr_group(struct wacom *wacom, __u32 serial,
1894                                           int index)
1895 {
1896         int error = 0;
1897         struct wacom_remote *remote = wacom->remote;
1898
1899         remote->remotes[index].group.name = devm_kasprintf(&wacom->hdev->dev,
1900                                                           GFP_KERNEL,
1901                                                           "%d", serial);
1902         if (!remote->remotes[index].group.name)
1903                 return -ENOMEM;
1904
1905         error = __wacom_devm_sysfs_create_group(wacom, remote->remote_dir,
1906                                                 &remote->remotes[index].group);
1907         if (error) {
1908                 remote->remotes[index].group.name = NULL;
1909                 hid_err(wacom->hdev,
1910                         "cannot create sysfs group err: %d\n", error);
1911                 return error;
1912         }
1913
1914         return 0;
1915 }
1916
1917 static int wacom_cmd_unpair_remote(struct wacom *wacom, unsigned char selector)
1918 {
1919         const size_t buf_size = 2;
1920         unsigned char *buf;
1921         int retval;
1922
1923         buf = kzalloc(buf_size, GFP_KERNEL);
1924         if (!buf)
1925                 return -ENOMEM;
1926
1927         buf[0] = WAC_CMD_DELETE_PAIRING;
1928         buf[1] = selector;
1929
1930         retval = wacom_set_report(wacom->hdev, HID_OUTPUT_REPORT, buf,
1931                                   buf_size, WAC_CMD_RETRIES);
1932         kfree(buf);
1933
1934         return retval;
1935 }
1936
1937 static ssize_t wacom_store_unpair_remote(struct kobject *kobj,
1938                                          struct kobj_attribute *attr,
1939                                          const char *buf, size_t count)
1940 {
1941         unsigned char selector = 0;
1942         struct device *dev = kobj_to_dev(kobj->parent);
1943         struct hid_device *hdev = to_hid_device(dev);
1944         struct wacom *wacom = hid_get_drvdata(hdev);
1945         int err;
1946
1947         if (!strncmp(buf, "*\n", 2)) {
1948                 selector = WAC_CMD_UNPAIR_ALL;
1949         } else {
1950                 hid_info(wacom->hdev, "remote: unrecognized unpair code: %s\n",
1951                          buf);
1952                 return -1;
1953         }
1954
1955         mutex_lock(&wacom->lock);
1956
1957         err = wacom_cmd_unpair_remote(wacom, selector);
1958         mutex_unlock(&wacom->lock);
1959
1960         return err < 0 ? err : count;
1961 }
1962
1963 static struct kobj_attribute unpair_remote_attr = {
1964         .attr = {.name = "unpair_remote", .mode = 0200},
1965         .store = wacom_store_unpair_remote,
1966 };
1967
1968 static const struct attribute *remote_unpair_attrs[] = {
1969         &unpair_remote_attr.attr,
1970         NULL
1971 };
1972
1973 static void wacom_remotes_destroy(void *data)
1974 {
1975         struct wacom *wacom = data;
1976         struct wacom_remote *remote = wacom->remote;
1977
1978         if (!remote)
1979                 return;
1980
1981         kobject_put(remote->remote_dir);
1982         kfifo_free(&remote->remote_fifo);
1983         wacom->remote = NULL;
1984 }
1985
1986 static int wacom_initialize_remotes(struct wacom *wacom)
1987 {
1988         int error = 0;
1989         struct wacom_remote *remote;
1990         int i;
1991
1992         if (wacom->wacom_wac.features.type != REMOTE)
1993                 return 0;
1994
1995         remote = devm_kzalloc(&wacom->hdev->dev, sizeof(*wacom->remote),
1996                               GFP_KERNEL);
1997         if (!remote)
1998                 return -ENOMEM;
1999
2000         wacom->remote = remote;
2001
2002         spin_lock_init(&remote->remote_lock);
2003
2004         error = kfifo_alloc(&remote->remote_fifo,
2005                         5 * sizeof(struct wacom_remote_data),
2006                         GFP_KERNEL);
2007         if (error) {
2008                 hid_err(wacom->hdev, "failed allocating remote_fifo\n");
2009                 return -ENOMEM;
2010         }
2011
2012         remote->remotes[0].group = remote0_serial_group;
2013         remote->remotes[1].group = remote1_serial_group;
2014         remote->remotes[2].group = remote2_serial_group;
2015         remote->remotes[3].group = remote3_serial_group;
2016         remote->remotes[4].group = remote4_serial_group;
2017
2018         remote->remote_dir = kobject_create_and_add("wacom_remote",
2019                                                     &wacom->hdev->dev.kobj);
2020         if (!remote->remote_dir)
2021                 return -ENOMEM;
2022
2023         error = sysfs_create_files(remote->remote_dir, remote_unpair_attrs);
2024
2025         if (error) {
2026                 hid_err(wacom->hdev,
2027                         "cannot create sysfs group err: %d\n", error);
2028                 return error;
2029         }
2030
2031         for (i = 0; i < WACOM_MAX_REMOTES; i++) {
2032                 wacom->led.groups[i].select = WACOM_STATUS_UNKNOWN;
2033                 remote->remotes[i].serial = 0;
2034         }
2035
2036         error = devm_add_action_or_reset(&wacom->hdev->dev,
2037                                          wacom_remotes_destroy, wacom);
2038         if (error)
2039                 return error;
2040
2041         return 0;
2042 }
2043
2044 static struct input_dev *wacom_allocate_input(struct wacom *wacom)
2045 {
2046         struct input_dev *input_dev;
2047         struct hid_device *hdev = wacom->hdev;
2048         struct wacom_wac *wacom_wac = &(wacom->wacom_wac);
2049
2050         input_dev = devm_input_allocate_device(&hdev->dev);
2051         if (!input_dev)
2052                 return NULL;
2053
2054         input_dev->name = wacom_wac->features.name;
2055         input_dev->phys = hdev->phys;
2056         input_dev->dev.parent = &hdev->dev;
2057         input_dev->open = wacom_open;
2058         input_dev->close = wacom_close;
2059         input_dev->uniq = hdev->uniq;
2060         input_dev->id.bustype = hdev->bus;
2061         input_dev->id.vendor  = hdev->vendor;
2062         input_dev->id.product = wacom_wac->pid ? wacom_wac->pid : hdev->product;
2063         input_dev->id.version = hdev->version;
2064         input_set_drvdata(input_dev, wacom);
2065
2066         return input_dev;
2067 }
2068
2069 static int wacom_allocate_inputs(struct wacom *wacom)
2070 {
2071         struct wacom_wac *wacom_wac = &(wacom->wacom_wac);
2072
2073         wacom_wac->pen_input = wacom_allocate_input(wacom);
2074         wacom_wac->touch_input = wacom_allocate_input(wacom);
2075         wacom_wac->pad_input = wacom_allocate_input(wacom);
2076         if (!wacom_wac->pen_input ||
2077             !wacom_wac->touch_input ||
2078             !wacom_wac->pad_input)
2079                 return -ENOMEM;
2080
2081         wacom_wac->pen_input->name = wacom_wac->pen_name;
2082         wacom_wac->touch_input->name = wacom_wac->touch_name;
2083         wacom_wac->pad_input->name = wacom_wac->pad_name;
2084
2085         return 0;
2086 }
2087
2088 static int wacom_register_inputs(struct wacom *wacom)
2089 {
2090         struct input_dev *pen_input_dev, *touch_input_dev, *pad_input_dev;
2091         struct wacom_wac *wacom_wac = &(wacom->wacom_wac);
2092         int error = 0;
2093
2094         pen_input_dev = wacom_wac->pen_input;
2095         touch_input_dev = wacom_wac->touch_input;
2096         pad_input_dev = wacom_wac->pad_input;
2097
2098         if (!pen_input_dev || !touch_input_dev || !pad_input_dev)
2099                 return -EINVAL;
2100
2101         error = wacom_setup_pen_input_capabilities(pen_input_dev, wacom_wac);
2102         if (error) {
2103                 /* no pen in use on this interface */
2104                 input_free_device(pen_input_dev);
2105                 wacom_wac->pen_input = NULL;
2106                 pen_input_dev = NULL;
2107         } else {
2108                 error = input_register_device(pen_input_dev);
2109                 if (error)
2110                         goto fail;
2111         }
2112
2113         error = wacom_setup_touch_input_capabilities(touch_input_dev, wacom_wac);
2114         if (error) {
2115                 /* no touch in use on this interface */
2116                 input_free_device(touch_input_dev);
2117                 wacom_wac->touch_input = NULL;
2118                 touch_input_dev = NULL;
2119         } else {
2120                 error = input_register_device(touch_input_dev);
2121                 if (error)
2122                         goto fail;
2123         }
2124
2125         error = wacom_setup_pad_input_capabilities(pad_input_dev, wacom_wac);
2126         if (error) {
2127                 /* no pad in use on this interface */
2128                 input_free_device(pad_input_dev);
2129                 wacom_wac->pad_input = NULL;
2130                 pad_input_dev = NULL;
2131         } else {
2132                 error = input_register_device(pad_input_dev);
2133                 if (error)
2134                         goto fail;
2135         }
2136
2137         return 0;
2138
2139 fail:
2140         wacom_wac->pad_input = NULL;
2141         wacom_wac->touch_input = NULL;
2142         wacom_wac->pen_input = NULL;
2143         return error;
2144 }
2145
2146 /*
2147  * Not all devices report physical dimensions from HID.
2148  * Compute the default from hardcoded logical dimension
2149  * and resolution before driver overwrites them.
2150  */
2151 static void wacom_set_default_phy(struct wacom_features *features)
2152 {
2153         if (features->x_resolution) {
2154                 features->x_phy = (features->x_max * 100) /
2155                                         features->x_resolution;
2156                 features->y_phy = (features->y_max * 100) /
2157                                         features->y_resolution;
2158         }
2159 }
2160
2161 static void wacom_calculate_res(struct wacom_features *features)
2162 {
2163         /* set unit to "100th of a mm" for devices not reported by HID */
2164         if (!features->unit) {
2165                 features->unit = 0x11;
2166                 features->unitExpo = -3;
2167         }
2168
2169         features->x_resolution = wacom_calc_hid_res(features->x_max,
2170                                                     features->x_phy,
2171                                                     features->unit,
2172                                                     features->unitExpo);
2173         features->y_resolution = wacom_calc_hid_res(features->y_max,
2174                                                     features->y_phy,
2175                                                     features->unit,
2176                                                     features->unitExpo);
2177 }
2178
2179 void wacom_battery_work(struct work_struct *work)
2180 {
2181         struct wacom *wacom = container_of(work, struct wacom, battery_work);
2182
2183         if ((wacom->wacom_wac.features.quirks & WACOM_QUIRK_BATTERY) &&
2184              !wacom->battery.battery) {
2185                 wacom_initialize_battery(wacom);
2186         }
2187         else if (!(wacom->wacom_wac.features.quirks & WACOM_QUIRK_BATTERY) &&
2188                  wacom->battery.battery) {
2189                 wacom_destroy_battery(wacom);
2190         }
2191 }
2192
2193 static size_t wacom_compute_pktlen(struct hid_device *hdev)
2194 {
2195         struct hid_report_enum *report_enum;
2196         struct hid_report *report;
2197         size_t size = 0;
2198
2199         report_enum = hdev->report_enum + HID_INPUT_REPORT;
2200
2201         list_for_each_entry(report, &report_enum->report_list, list) {
2202                 size_t report_size = hid_report_len(report);
2203                 if (report_size > size)
2204                         size = report_size;
2205         }
2206
2207         return size;
2208 }
2209
2210 static void wacom_update_name(struct wacom *wacom, const char *suffix)
2211 {
2212         struct wacom_wac *wacom_wac = &wacom->wacom_wac;
2213         struct wacom_features *features = &wacom_wac->features;
2214         char name[WACOM_NAME_MAX - 20]; /* Leave some room for suffixes */
2215
2216         /* Generic devices name unspecified */
2217         if ((features->type == HID_GENERIC) && !strcmp("Wacom HID", features->name)) {
2218                 char *product_name = wacom->hdev->name;
2219
2220                 if (hid_is_using_ll_driver(wacom->hdev, &usb_hid_driver)) {
2221                         struct usb_interface *intf = to_usb_interface(wacom->hdev->dev.parent);
2222                         struct usb_device *dev = interface_to_usbdev(intf);
2223                         product_name = dev->product;
2224                 }
2225
2226                 if (wacom->hdev->bus == BUS_I2C) {
2227                         snprintf(name, sizeof(name), "%s %X",
2228                                  features->name, wacom->hdev->product);
2229                 } else if (strstr(product_name, "Wacom") ||
2230                            strstr(product_name, "wacom") ||
2231                            strstr(product_name, "WACOM")) {
2232                         strlcpy(name, product_name, sizeof(name));
2233                 } else {
2234                         snprintf(name, sizeof(name), "Wacom %s", product_name);
2235                 }
2236
2237                 /* strip out excess whitespaces */
2238                 while (1) {
2239                         char *gap = strstr(name, "  ");
2240                         if (gap == NULL)
2241                                 break;
2242                         /* shift everything including the terminator */
2243                         memmove(gap, gap+1, strlen(gap));
2244                 }
2245
2246                 /* get rid of trailing whitespace */
2247                 if (name[strlen(name)-1] == ' ')
2248                         name[strlen(name)-1] = '\0';
2249         } else {
2250                 strlcpy(name, features->name, sizeof(name));
2251         }
2252
2253         snprintf(wacom_wac->name, sizeof(wacom_wac->name), "%s%s",
2254                  name, suffix);
2255
2256         /* Append the device type to the name */
2257         snprintf(wacom_wac->pen_name, sizeof(wacom_wac->pen_name),
2258                 "%s%s Pen", name, suffix);
2259         snprintf(wacom_wac->touch_name, sizeof(wacom_wac->touch_name),
2260                 "%s%s Finger", name, suffix);
2261         snprintf(wacom_wac->pad_name, sizeof(wacom_wac->pad_name),
2262                 "%s%s Pad", name, suffix);
2263 }
2264
2265 static void wacom_release_resources(struct wacom *wacom)
2266 {
2267         struct hid_device *hdev = wacom->hdev;
2268
2269         if (!wacom->resources)
2270                 return;
2271
2272         devres_release_group(&hdev->dev, wacom);
2273
2274         wacom->resources = false;
2275
2276         wacom->wacom_wac.pen_input = NULL;
2277         wacom->wacom_wac.touch_input = NULL;
2278         wacom->wacom_wac.pad_input = NULL;
2279 }
2280
2281 static void wacom_set_shared_values(struct wacom_wac *wacom_wac)
2282 {
2283         if (wacom_wac->features.device_type & WACOM_DEVICETYPE_TOUCH) {
2284                 wacom_wac->shared->type = wacom_wac->features.type;
2285                 wacom_wac->shared->touch_input = wacom_wac->touch_input;
2286         }
2287
2288         if (wacom_wac->has_mute_touch_switch) {
2289                 wacom_wac->shared->has_mute_touch_switch = true;
2290                 /* Hardware touch switch may be off. Wait until
2291                  * we know the switch state to decide is_touch_on.
2292                  * Softkey state should be initialized to "on" to
2293                  * match historic default.
2294                  */
2295                 if (wacom_wac->is_soft_touch_switch)
2296                         wacom_wac->shared->is_touch_on = true;
2297         }
2298
2299         if (wacom_wac->shared->has_mute_touch_switch &&
2300             wacom_wac->shared->touch_input) {
2301                 set_bit(EV_SW, wacom_wac->shared->touch_input->evbit);
2302                 input_set_capability(wacom_wac->shared->touch_input, EV_SW,
2303                                      SW_MUTE_DEVICE);
2304         }
2305 }
2306
2307 static int wacom_parse_and_register(struct wacom *wacom, bool wireless)
2308 {
2309         struct wacom_wac *wacom_wac = &wacom->wacom_wac;
2310         struct wacom_features *features = &wacom_wac->features;
2311         struct hid_device *hdev = wacom->hdev;
2312         int error;
2313         unsigned int connect_mask = HID_CONNECT_HIDRAW;
2314
2315         features->pktlen = wacom_compute_pktlen(hdev);
2316         if (features->pktlen > WACOM_PKGLEN_MAX)
2317                 return -EINVAL;
2318
2319         if (!devres_open_group(&hdev->dev, wacom, GFP_KERNEL))
2320                 return -ENOMEM;
2321
2322         wacom->resources = true;
2323
2324         error = wacom_allocate_inputs(wacom);
2325         if (error)
2326                 goto fail;
2327
2328         /*
2329          * Bamboo Pad has a generic hid handling for the Pen, and we switch it
2330          * into debug mode for the touch part.
2331          * We ignore the other interfaces.
2332          */
2333         if (features->type == BAMBOO_PAD) {
2334                 if (features->pktlen == WACOM_PKGLEN_PENABLED) {
2335                         features->type = HID_GENERIC;
2336                 } else if ((features->pktlen != WACOM_PKGLEN_BPAD_TOUCH) &&
2337                            (features->pktlen != WACOM_PKGLEN_BPAD_TOUCH_USB)) {
2338                         error = -ENODEV;
2339                         goto fail;
2340                 }
2341         }
2342
2343         /* set the default size in case we do not get them from hid */
2344         wacom_set_default_phy(features);
2345
2346         /* Retrieve the physical and logical size for touch devices */
2347         wacom_retrieve_hid_descriptor(hdev, features);
2348         wacom_setup_device_quirks(wacom);
2349
2350         if (features->device_type == WACOM_DEVICETYPE_NONE &&
2351             features->type != WIRELESS) {
2352                 error = features->type == HID_GENERIC ? -ENODEV : 0;
2353
2354                 dev_warn(&hdev->dev, "Unknown device_type for '%s'. %s.",
2355                          hdev->name,
2356                          error ? "Ignoring" : "Assuming pen");
2357
2358                 if (error)
2359                         goto fail;
2360
2361                 features->device_type |= WACOM_DEVICETYPE_PEN;
2362         }
2363
2364         wacom_calculate_res(features);
2365
2366         wacom_update_name(wacom, wireless ? " (WL)" : "");
2367
2368         /* pen only Bamboo neither support touch nor pad */
2369         if ((features->type == BAMBOO_PEN) &&
2370             ((features->device_type & WACOM_DEVICETYPE_TOUCH) ||
2371             (features->device_type & WACOM_DEVICETYPE_PAD))) {
2372                 error = -ENODEV;
2373                 goto fail;
2374         }
2375
2376         error = wacom_add_shared_data(hdev);
2377         if (error)
2378                 goto fail;
2379
2380         if (!(features->device_type & WACOM_DEVICETYPE_WL_MONITOR) &&
2381              (features->quirks & WACOM_QUIRK_BATTERY)) {
2382                 error = wacom_initialize_battery(wacom);
2383                 if (error)
2384                         goto fail;
2385         }
2386
2387         error = wacom_register_inputs(wacom);
2388         if (error)
2389                 goto fail;
2390
2391         if (wacom->wacom_wac.features.device_type & WACOM_DEVICETYPE_PAD) {
2392                 error = wacom_initialize_leds(wacom);
2393                 if (error)
2394                         goto fail;
2395
2396                 error = wacom_initialize_remotes(wacom);
2397                 if (error)
2398                         goto fail;
2399         }
2400
2401         if (features->type == HID_GENERIC)
2402                 connect_mask |= HID_CONNECT_DRIVER;
2403
2404         /* Regular HID work starts now */
2405         error = hid_hw_start(hdev, connect_mask);
2406         if (error) {
2407                 hid_err(hdev, "hw start failed\n");
2408                 goto fail;
2409         }
2410
2411         if (!wireless) {
2412                 /* Note that if query fails it is not a hard failure */
2413                 wacom_query_tablet_data(wacom);
2414         }
2415
2416         /* touch only Bamboo doesn't support pen */
2417         if ((features->type == BAMBOO_TOUCH) &&
2418             (features->device_type & WACOM_DEVICETYPE_PEN)) {
2419                 cancel_delayed_work_sync(&wacom->init_work);
2420                 _wacom_query_tablet_data(wacom);
2421                 error = -ENODEV;
2422                 goto fail_quirks;
2423         }
2424
2425         if (features->device_type & WACOM_DEVICETYPE_WL_MONITOR)
2426                 error = hid_hw_open(hdev);
2427
2428         wacom_set_shared_values(wacom_wac);
2429         devres_close_group(&hdev->dev, wacom);
2430
2431         return 0;
2432
2433 fail_quirks:
2434         hid_hw_stop(hdev);
2435 fail:
2436         wacom_release_resources(wacom);
2437         return error;
2438 }
2439
2440 static void wacom_wireless_work(struct work_struct *work)
2441 {
2442         struct wacom *wacom = container_of(work, struct wacom, wireless_work);
2443         struct usb_device *usbdev = wacom->usbdev;
2444         struct wacom_wac *wacom_wac = &wacom->wacom_wac;
2445         struct hid_device *hdev1, *hdev2;
2446         struct wacom *wacom1, *wacom2;
2447         struct wacom_wac *wacom_wac1, *wacom_wac2;
2448         int error;
2449
2450         /*
2451          * Regardless if this is a disconnect or a new tablet,
2452          * remove any existing input and battery devices.
2453          */
2454
2455         wacom_destroy_battery(wacom);
2456
2457         /* Stylus interface */
2458         hdev1 = usb_get_intfdata(usbdev->config->interface[1]);
2459         wacom1 = hid_get_drvdata(hdev1);
2460         wacom_wac1 = &(wacom1->wacom_wac);
2461         wacom_release_resources(wacom1);
2462
2463         /* Touch interface */
2464         hdev2 = usb_get_intfdata(usbdev->config->interface[2]);
2465         wacom2 = hid_get_drvdata(hdev2);
2466         wacom_wac2 = &(wacom2->wacom_wac);
2467         wacom_release_resources(wacom2);
2468
2469         if (wacom_wac->pid == 0) {
2470                 hid_info(wacom->hdev, "wireless tablet disconnected\n");
2471         } else {
2472                 const struct hid_device_id *id = wacom_ids;
2473
2474                 hid_info(wacom->hdev, "wireless tablet connected with PID %x\n",
2475                          wacom_wac->pid);
2476
2477                 while (id->bus) {
2478                         if (id->vendor == USB_VENDOR_ID_WACOM &&
2479                             id->product == wacom_wac->pid)
2480                                 break;
2481                         id++;
2482                 }
2483
2484                 if (!id->bus) {
2485                         hid_info(wacom->hdev, "ignoring unknown PID.\n");
2486                         return;
2487                 }
2488
2489                 /* Stylus interface */
2490                 wacom_wac1->features =
2491                         *((struct wacom_features *)id->driver_data);
2492
2493                 wacom_wac1->pid = wacom_wac->pid;
2494                 hid_hw_stop(hdev1);
2495                 error = wacom_parse_and_register(wacom1, true);
2496                 if (error)
2497                         goto fail;
2498
2499                 /* Touch interface */
2500                 if (wacom_wac1->features.touch_max ||
2501                     (wacom_wac1->features.type >= INTUOSHT &&
2502                     wacom_wac1->features.type <= BAMBOO_PT)) {
2503                         wacom_wac2->features =
2504                                 *((struct wacom_features *)id->driver_data);
2505                         wacom_wac2->pid = wacom_wac->pid;
2506                         hid_hw_stop(hdev2);
2507                         error = wacom_parse_and_register(wacom2, true);
2508                         if (error)
2509                                 goto fail;
2510                 }
2511
2512                 strlcpy(wacom_wac->name, wacom_wac1->name,
2513                         sizeof(wacom_wac->name));
2514                 error = wacom_initialize_battery(wacom);
2515                 if (error)
2516                         goto fail;
2517         }
2518
2519         return;
2520
2521 fail:
2522         wacom_release_resources(wacom1);
2523         wacom_release_resources(wacom2);
2524         return;
2525 }
2526
2527 static void wacom_remote_destroy_one(struct wacom *wacom, unsigned int index)
2528 {
2529         struct wacom_remote *remote = wacom->remote;
2530         u32 serial = remote->remotes[index].serial;
2531         int i;
2532         unsigned long flags;
2533
2534         for (i = 0; i < WACOM_MAX_REMOTES; i++) {
2535                 if (remote->remotes[i].serial == serial) {
2536
2537                         spin_lock_irqsave(&remote->remote_lock, flags);
2538                         remote->remotes[i].registered = false;
2539                         spin_unlock_irqrestore(&remote->remote_lock, flags);
2540
2541                         if (remote->remotes[i].battery.battery)
2542                                 devres_release_group(&wacom->hdev->dev,
2543                                                      &remote->remotes[i].battery.bat_desc);
2544
2545                         if (remote->remotes[i].group.name)
2546                                 devres_release_group(&wacom->hdev->dev,
2547                                                      &remote->remotes[i]);
2548
2549                         remote->remotes[i].serial = 0;
2550                         remote->remotes[i].group.name = NULL;
2551                         remote->remotes[i].battery.battery = NULL;
2552                         wacom->led.groups[i].select = WACOM_STATUS_UNKNOWN;
2553                 }
2554         }
2555 }
2556
2557 static int wacom_remote_create_one(struct wacom *wacom, u32 serial,
2558                                    unsigned int index)
2559 {
2560         struct wacom_remote *remote = wacom->remote;
2561         struct device *dev = &wacom->hdev->dev;
2562         int error, k;
2563
2564         /* A remote can pair more than once with an EKR,
2565          * check to make sure this serial isn't already paired.
2566          */
2567         for (k = 0; k < WACOM_MAX_REMOTES; k++) {
2568                 if (remote->remotes[k].serial == serial)
2569                         break;
2570         }
2571
2572         if (k < WACOM_MAX_REMOTES) {
2573                 remote->remotes[index].serial = serial;
2574                 return 0;
2575         }
2576
2577         if (!devres_open_group(dev, &remote->remotes[index], GFP_KERNEL))
2578                 return -ENOMEM;
2579
2580         error = wacom_remote_create_attr_group(wacom, serial, index);
2581         if (error)
2582                 goto fail;
2583
2584         remote->remotes[index].input = wacom_allocate_input(wacom);
2585         if (!remote->remotes[index].input) {
2586                 error = -ENOMEM;
2587                 goto fail;
2588         }
2589         remote->remotes[index].input->uniq = remote->remotes[index].group.name;
2590         remote->remotes[index].input->name = wacom->wacom_wac.pad_name;
2591
2592         if (!remote->remotes[index].input->name) {
2593                 error = -EINVAL;
2594                 goto fail;
2595         }
2596
2597         error = wacom_setup_pad_input_capabilities(remote->remotes[index].input,
2598                                                    &wacom->wacom_wac);
2599         if (error)
2600                 goto fail;
2601
2602         remote->remotes[index].serial = serial;
2603
2604         error = input_register_device(remote->remotes[index].input);
2605         if (error)
2606                 goto fail;
2607
2608         error = wacom_led_groups_alloc_and_register_one(
2609                                         &remote->remotes[index].input->dev,
2610                                         wacom, index, 3, true);
2611         if (error)
2612                 goto fail;
2613
2614         remote->remotes[index].registered = true;
2615
2616         devres_close_group(dev, &remote->remotes[index]);
2617         return 0;
2618
2619 fail:
2620         devres_release_group(dev, &remote->remotes[index]);
2621         remote->remotes[index].serial = 0;
2622         return error;
2623 }
2624
2625 static int wacom_remote_attach_battery(struct wacom *wacom, int index)
2626 {
2627         struct wacom_remote *remote = wacom->remote;
2628         int error;
2629
2630         if (!remote->remotes[index].registered)
2631                 return 0;
2632
2633         if (remote->remotes[index].battery.battery)
2634                 return 0;
2635
2636         if (wacom->led.groups[index].select == WACOM_STATUS_UNKNOWN)
2637                 return 0;
2638
2639         error = __wacom_initialize_battery(wacom,
2640                                         &wacom->remote->remotes[index].battery);
2641         if (error)
2642                 return error;
2643
2644         return 0;
2645 }
2646
2647 static void wacom_remote_work(struct work_struct *work)
2648 {
2649         struct wacom *wacom = container_of(work, struct wacom, remote_work);
2650         struct wacom_remote *remote = wacom->remote;
2651         struct wacom_remote_data data;
2652         unsigned long flags;
2653         unsigned int count;
2654         u32 serial;
2655         int i;
2656
2657         spin_lock_irqsave(&remote->remote_lock, flags);
2658
2659         count = kfifo_out(&remote->remote_fifo, &data, sizeof(data));
2660
2661         if (count != sizeof(data)) {
2662                 hid_err(wacom->hdev,
2663                         "workitem triggered without status available\n");
2664                 spin_unlock_irqrestore(&remote->remote_lock, flags);
2665                 return;
2666         }
2667
2668         if (!kfifo_is_empty(&remote->remote_fifo))
2669                 wacom_schedule_work(&wacom->wacom_wac, WACOM_WORKER_REMOTE);
2670
2671         spin_unlock_irqrestore(&remote->remote_lock, flags);
2672
2673         for (i = 0; i < WACOM_MAX_REMOTES; i++) {
2674                 serial = data.remote[i].serial;
2675                 if (data.remote[i].connected) {
2676
2677                         if (remote->remotes[i].serial == serial) {
2678                                 wacom_remote_attach_battery(wacom, i);
2679                                 continue;
2680                         }
2681
2682                         if (remote->remotes[i].serial)
2683                                 wacom_remote_destroy_one(wacom, i);
2684
2685                         wacom_remote_create_one(wacom, serial, i);
2686
2687                 } else if (remote->remotes[i].serial) {
2688                         wacom_remote_destroy_one(wacom, i);
2689                 }
2690         }
2691 }
2692
2693 static void wacom_mode_change_work(struct work_struct *work)
2694 {
2695         struct wacom *wacom = container_of(work, struct wacom, mode_change_work);
2696         struct wacom_shared *shared = wacom->wacom_wac.shared;
2697         struct wacom *wacom1 = NULL;
2698         struct wacom *wacom2 = NULL;
2699         bool is_direct = wacom->wacom_wac.is_direct_mode;
2700         int error = 0;
2701
2702         if (shared->pen) {
2703                 wacom1 = hid_get_drvdata(shared->pen);
2704                 wacom_release_resources(wacom1);
2705                 hid_hw_stop(wacom1->hdev);
2706                 wacom1->wacom_wac.has_mode_change = true;
2707                 wacom1->wacom_wac.is_direct_mode = is_direct;
2708         }
2709
2710         if (shared->touch) {
2711                 wacom2 = hid_get_drvdata(shared->touch);
2712                 wacom_release_resources(wacom2);
2713                 hid_hw_stop(wacom2->hdev);
2714                 wacom2->wacom_wac.has_mode_change = true;
2715                 wacom2->wacom_wac.is_direct_mode = is_direct;
2716         }
2717
2718         if (wacom1) {
2719                 error = wacom_parse_and_register(wacom1, false);
2720                 if (error)
2721                         return;
2722         }
2723
2724         if (wacom2) {
2725                 error = wacom_parse_and_register(wacom2, false);
2726                 if (error)
2727                         return;
2728         }
2729
2730         return;
2731 }
2732
2733 static int wacom_probe(struct hid_device *hdev,
2734                 const struct hid_device_id *id)
2735 {
2736         struct usb_interface *intf = to_usb_interface(hdev->dev.parent);
2737         struct usb_device *dev = interface_to_usbdev(intf);
2738         struct wacom *wacom;
2739         struct wacom_wac *wacom_wac;
2740         struct wacom_features *features;
2741         int error;
2742
2743         if (!id->driver_data)
2744                 return -EINVAL;
2745
2746         hdev->quirks |= HID_QUIRK_NO_INIT_REPORTS;
2747
2748         /* hid-core sets this quirk for the boot interface */
2749         hdev->quirks &= ~HID_QUIRK_NOGET;
2750
2751         wacom = devm_kzalloc(&hdev->dev, sizeof(struct wacom), GFP_KERNEL);
2752         if (!wacom)
2753                 return -ENOMEM;
2754
2755         hid_set_drvdata(hdev, wacom);
2756         wacom->hdev = hdev;
2757
2758         wacom_wac = &wacom->wacom_wac;
2759         wacom_wac->features = *((struct wacom_features *)id->driver_data);
2760         features = &wacom_wac->features;
2761
2762         if (features->check_for_hid_type && features->hid_type != hdev->type)
2763                 return -ENODEV;
2764
2765         error = wacom_devm_kfifo_alloc(wacom);
2766         if (error)
2767                 return error;
2768
2769         wacom_wac->hid_data.inputmode = -1;
2770         wacom_wac->mode_report = -1;
2771
2772         wacom->usbdev = dev;
2773         wacom->intf = intf;
2774         mutex_init(&wacom->lock);
2775         INIT_DELAYED_WORK(&wacom->init_work, wacom_init_work);
2776         INIT_WORK(&wacom->wireless_work, wacom_wireless_work);
2777         INIT_WORK(&wacom->battery_work, wacom_battery_work);
2778         INIT_WORK(&wacom->remote_work, wacom_remote_work);
2779         INIT_WORK(&wacom->mode_change_work, wacom_mode_change_work);
2780
2781         /* ask for the report descriptor to be loaded by HID */
2782         error = hid_parse(hdev);
2783         if (error) {
2784                 hid_err(hdev, "parse failed\n");
2785                 return error;
2786         }
2787
2788         error = wacom_parse_and_register(wacom, false);
2789         if (error)
2790                 return error;
2791
2792         if (hdev->bus == BUS_BLUETOOTH) {
2793                 error = device_create_file(&hdev->dev, &dev_attr_speed);
2794                 if (error)
2795                         hid_warn(hdev,
2796                                  "can't create sysfs speed attribute err: %d\n",
2797                                  error);
2798         }
2799
2800         wacom_wac->probe_complete = true;
2801         return 0;
2802 }
2803
2804 static void wacom_remove(struct hid_device *hdev)
2805 {
2806         struct wacom *wacom = hid_get_drvdata(hdev);
2807         struct wacom_wac *wacom_wac = &wacom->wacom_wac;
2808         struct wacom_features *features = &wacom_wac->features;
2809
2810         if (features->device_type & WACOM_DEVICETYPE_WL_MONITOR)
2811                 hid_hw_close(hdev);
2812
2813         hid_hw_stop(hdev);
2814
2815         cancel_delayed_work_sync(&wacom->init_work);
2816         cancel_work_sync(&wacom->wireless_work);
2817         cancel_work_sync(&wacom->battery_work);
2818         cancel_work_sync(&wacom->remote_work);
2819         cancel_work_sync(&wacom->mode_change_work);
2820         if (hdev->bus == BUS_BLUETOOTH)
2821                 device_remove_file(&hdev->dev, &dev_attr_speed);
2822
2823         /* make sure we don't trigger the LEDs */
2824         wacom_led_groups_release(wacom);
2825
2826         if (wacom->wacom_wac.features.type != REMOTE)
2827                 wacom_release_resources(wacom);
2828 }
2829
2830 #ifdef CONFIG_PM
2831 static int wacom_resume(struct hid_device *hdev)
2832 {
2833         struct wacom *wacom = hid_get_drvdata(hdev);
2834
2835         mutex_lock(&wacom->lock);
2836
2837         /* switch to wacom mode first */
2838         _wacom_query_tablet_data(wacom);
2839         wacom_led_control(wacom);
2840
2841         mutex_unlock(&wacom->lock);
2842
2843         return 0;
2844 }
2845
2846 static int wacom_reset_resume(struct hid_device *hdev)
2847 {
2848         return wacom_resume(hdev);
2849 }
2850 #endif /* CONFIG_PM */
2851
2852 static struct hid_driver wacom_driver = {
2853         .name =         "wacom",
2854         .id_table =     wacom_ids,
2855         .probe =        wacom_probe,
2856         .remove =       wacom_remove,
2857         .report =       wacom_wac_report,
2858 #ifdef CONFIG_PM
2859         .resume =       wacom_resume,
2860         .reset_resume = wacom_reset_resume,
2861 #endif
2862         .raw_event =    wacom_raw_event,
2863 };
2864 module_hid_driver(wacom_driver);
2865
2866 MODULE_VERSION(DRIVER_VERSION);
2867 MODULE_AUTHOR(DRIVER_AUTHOR);
2868 MODULE_DESCRIPTION(DRIVER_DESC);
2869 MODULE_LICENSE("GPL");