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