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 (wacom->wacom_wac.features.type == BOOTLOADER)
 164                 return 0;
 165
 166         if (size > WACOM_PKGLEN_MAX)
 167                 return 1;
 168
 169         if (wacom_wac_pen_serial_enforce(hdev, report, raw_data, size))
 170                 return -1;
 171
 172         memcpy(wacom->wacom_wac.data, raw_data, size);
 173
 174         wacom_wac_irq(&wacom->wacom_wac, size);
 175
 176         return 0;
 177 }
 178
 179 static int wacom_open(struct input_dev *dev)
 180 {
 181         struct wacom *wacom = input_get_drvdata(dev);
 182
 183         return hid_hw_open(wacom->hdev);
 184 }
 185
 186 static void wacom_close(struct input_dev *dev)
 187 {
 188         struct wacom *wacom = input_get_drvdata(dev);
 189
 190         /*
 191          * wacom->hdev should never be null, but surprisingly, I had the case
 192          * once while unplugging the Wacom Wireless Receiver.
 193          */
 194         if (wacom->hdev)
 195                 hid_hw_close(wacom->hdev);
 196 }
 197
 198 /*
 199  * Calculate the resolution of the X or Y axis using hidinput_calc_abs_res.
 200  */
 201 static int wacom_calc_hid_res(int logical_extents, int physical_extents,
 202                                unsigned unit, int exponent)
 203 {
 204         struct hid_field field = {
 205                 .logical_maximum = logical_extents,
 206                 .physical_maximum = physical_extents,
 207                 .unit = unit,
 208                 .unit_exponent = exponent,
 209         };
 210
 211         return hidinput_calc_abs_res(&field, ABS_X);
 212 }
 213
 214 static void wacom_hid_usage_quirk(struct hid_device *hdev,
 215                 struct hid_field *field, struct hid_usage *usage)
 216 {
 217         struct wacom *wacom = hid_get_drvdata(hdev);
 218         struct wacom_features *features = &wacom->wacom_wac.features;
 219         unsigned int equivalent_usage = wacom_equivalent_usage(usage->hid);
 220
 221         /*
 222          * The Dell Canvas 27 needs to be switched to its vendor-defined
 223          * report to provide the best resolution.
 224          */
 225         if (hdev->vendor == USB_VENDOR_ID_WACOM &&
 226             hdev->product == 0x4200 &&
 227             field->application == HID_UP_MSVENDOR) {
 228                 wacom->wacom_wac.mode_report = field->report->id;
 229                 wacom->wacom_wac.mode_value = 2;
 230         }
 231
 232         /*
 233          * ISDv4 devices which predate HID's adoption of the
 234          * HID_DG_BARELSWITCH2 usage use 0x000D0000 in its
 235          * position instead. We can accurately detect if a
 236          * usage with that value should be HID_DG_BARRELSWITCH2
 237          * based on the surrounding usages, which have remained
 238          * constant across generations.
 239          */
 240         if (features->type == HID_GENERIC &&
 241             usage->hid == 0x000D0000 &&
 242             field->application == HID_DG_PEN &&
 243             field->physical == HID_DG_STYLUS) {
 244                 int i = usage->usage_index;
 245
 246                 if (i-4 >= 0 && i+1 < field->maxusage &&
 247                     field->usage[i-4].hid == HID_DG_TIPSWITCH &&
 248                     field->usage[i-3].hid == HID_DG_BARRELSWITCH &&
 249                     field->usage[i-2].hid == HID_DG_ERASER &&
 250                     field->usage[i-1].hid == HID_DG_INVERT &&
 251                     field->usage[i+1].hid == HID_DG_INRANGE) {
 252                         usage->hid = HID_DG_BARRELSWITCH2;
 253                 }
 254         }
 255
 256         /*
 257          * Wacom's AES devices use different vendor-defined usages to
 258          * report serial number information compared to their branded
 259          * hardware. The usages are also sometimes ill-defined and do
 260          * not have the correct logical min/max values set. Lets patch
 261          * the descriptor to use the branded usage convention and fix
 262          * the errors.
 263          */
 264         if (usage->hid == WACOM_HID_WT_SERIALNUMBER &&
 265             field->report_size == 16 &&
 266             field->index + 2 < field->report->maxfield) {
 267                 struct hid_field *a = field->report->field[field->index + 1];
 268                 struct hid_field *b = field->report->field[field->index + 2];
 269
 270                 if (a->maxusage > 0 &&
 271                     a->usage[0].hid == HID_DG_TOOLSERIALNUMBER &&
 272                     a->report_size == 32 &&
 273                     b->maxusage > 0 &&
 274                     b->usage[0].hid == 0xFF000000 &&
 275                     b->report_size == 8) {
 276                         features->quirks |= WACOM_QUIRK_AESPEN;
 277                         usage->hid = WACOM_HID_WD_TOOLTYPE;
 278                         field->logical_minimum = S16_MIN;
 279                         field->logical_maximum = S16_MAX;
 280                         a->logical_minimum = S32_MIN;
 281                         a->logical_maximum = S32_MAX;
 282                         b->usage[0].hid = WACOM_HID_WD_SERIALHI;
 283                         b->logical_minimum = 0;
 284                         b->logical_maximum = U8_MAX;
 285                 }
 286         }
 287
 288         /* 2nd-generation Intuos Pro Large has incorrect Y maximum */
 289         if (hdev->vendor == USB_VENDOR_ID_WACOM &&
 290             hdev->product == 0x0358 &&
 291             WACOM_PEN_FIELD(field) &&
 292             equivalent_usage == HID_GD_Y) {
 293                 field->logical_maximum = 43200;
 294         }
 295 }
 296
 297 static void wacom_feature_mapping(struct hid_device *hdev,
 298                 struct hid_field *field, struct hid_usage *usage)
 299 {
 300         struct wacom *wacom = hid_get_drvdata(hdev);
 301         struct wacom_features *features = &wacom->wacom_wac.features;
 302         struct hid_data *hid_data = &wacom->wacom_wac.hid_data;
 303         unsigned int equivalent_usage = wacom_equivalent_usage(usage->hid);
 304         u8 *data;
 305         int ret;
 306         u32 n;
 307
 308         wacom_hid_usage_quirk(hdev, field, usage);
 309
 310         switch (equivalent_usage) {
 311         case WACOM_HID_WD_TOUCH_RING_SETTING:
 312                 wacom->generic_has_leds = true;
 313                 break;
 314         case HID_DG_CONTACTMAX:
 315                 /* leave touch_max as is if predefined */
 316                 if (!features->touch_max) {
 317                         /* read manually */
 318                         n = hid_report_len(field->report);
 319                         data = hid_alloc_report_buf(field->report, GFP_KERNEL);
 320                         if (!data)
 321                                 break;
 322                         data[0] = field->report->id;
 323                         ret = wacom_get_report(hdev, HID_FEATURE_REPORT,
 324                                                data, n, WAC_CMD_RETRIES);
 325                         if (ret == n && features->type == HID_GENERIC) {
 326                                 ret = hid_report_raw_event(hdev,
 327                                         HID_FEATURE_REPORT, data, n, 0);
 328                         } else if (ret == 2 && features->type != HID_GENERIC) {
 329                                 features->touch_max = data[1];
 330                         } else {
 331                                 features->touch_max = 16;
 332                                 hid_warn(hdev, "wacom_feature_mapping: "
 333                                          "could not get HID_DG_CONTACTMAX, "
 334                                          "defaulting to %d\n",
 335                                           features->touch_max);
 336                         }
 337                         kfree(data);
 338                 }
 339                 break;
 340         case HID_DG_INPUTMODE:
 341                 /* Ignore if value index is out of bounds. */
 342                 if (usage->usage_index >= field->report_count) {
 343                         dev_err(&hdev->dev, "HID_DG_INPUTMODE out of range\n");
 344                         break;
 345                 }
 346
 347                 hid_data->inputmode = field->report->id;
 348                 hid_data->inputmode_index = usage->usage_index;
 349                 break;
 350
 351         case HID_UP_DIGITIZER:
 352                 if (field->report->id == 0x0B &&
 353                     (field->application == WACOM_HID_G9_PEN ||
 354                      field->application == WACOM_HID_G11_PEN)) {
 355                         wacom->wacom_wac.mode_report = field->report->id;
 356                         wacom->wacom_wac.mode_value = 0;
 357                 }
 358                 break;
 359
 360         case WACOM_HID_WD_DATAMODE:
 361                 wacom->wacom_wac.mode_report = field->report->id;
 362                 wacom->wacom_wac.mode_value = 2;
 363                 break;
 364
 365         case WACOM_HID_UP_G9:
 366         case WACOM_HID_UP_G11:
 367                 if (field->report->id == 0x03 &&
 368                     (field->application == WACOM_HID_G9_TOUCHSCREEN ||
 369                      field->application == WACOM_HID_G11_TOUCHSCREEN)) {
 370                         wacom->wacom_wac.mode_report = field->report->id;
 371                         wacom->wacom_wac.mode_value = 0;
 372                 }
 373                 break;
 374         case WACOM_HID_WD_OFFSETLEFT:
 375         case WACOM_HID_WD_OFFSETTOP:
 376         case WACOM_HID_WD_OFFSETRIGHT:
 377         case WACOM_HID_WD_OFFSETBOTTOM:
 378                 /* read manually */
 379                 n = hid_report_len(field->report);
 380                 data = hid_alloc_report_buf(field->report, GFP_KERNEL);
 381                 if (!data)
 382                         break;
 383                 data[0] = field->report->id;
 384                 ret = wacom_get_report(hdev, HID_FEATURE_REPORT,
 385                                         data, n, WAC_CMD_RETRIES);
 386                 if (ret == n) {
 387                         ret = hid_report_raw_event(hdev, HID_FEATURE_REPORT,
 388                                                    data, n, 0);
 389                 } else {
 390                         hid_warn(hdev, "%s: could not retrieve sensor offsets\n",
 391                                  __func__);
 392                 }
 393                 kfree(data);
 394                 break;
 395         }
 396 }
 397
 398 /*
 399  * Interface Descriptor of wacom devices can be incomplete and
 400  * inconsistent so wacom_features table is used to store stylus
 401  * device's packet lengths, various maximum values, and tablet
 402  * resolution based on product ID's.
 403  *
 404  * For devices that contain 2 interfaces, wacom_features table is
 405  * inaccurate for the touch interface.  Since the Interface Descriptor
 406  * for touch interfaces has pretty complete data, this function exists
 407  * to query tablet for this missing information instead of hard coding in
 408  * an additional table.
 409  *
 410  * A typical Interface Descriptor for a stylus will contain a
 411  * boot mouse application collection that is not of interest and this
 412  * function will ignore it.
 413  *
 414  * It also contains a digitizer application collection that also is not
 415  * of interest since any information it contains would be duplicate
 416  * of what is in wacom_features. Usually it defines a report of an array
 417  * of bytes that could be used as max length of the stylus packet returned.
 418  * If it happens to define a Digitizer-Stylus Physical Collection then
 419  * the X and Y logical values contain valid data but it is ignored.
 420  *
 421  * A typical Interface Descriptor for a touch interface will contain a
 422  * Digitizer-Finger Physical Collection which will define both logical
 423  * X/Y maximum as well as the physical size of tablet. Since touch
 424  * interfaces haven't supported pressure or distance, this is enough
 425  * information to override invalid values in the wacom_features table.
 426  *
 427  * Intuos5 touch interface and 3rd gen Bamboo Touch do not contain useful
 428  * data. We deal with them after returning from this function.
 429  */
 430 static void wacom_usage_mapping(struct hid_device *hdev,
 431                 struct hid_field *field, struct hid_usage *usage)
 432 {
 433         struct wacom *wacom = hid_get_drvdata(hdev);
 434         struct wacom_features *features = &wacom->wacom_wac.features;
 435         bool finger = WACOM_FINGER_FIELD(field);
 436         bool pen = WACOM_PEN_FIELD(field);
 437         unsigned equivalent_usage = wacom_equivalent_usage(usage->hid);
 438
 439         /*
 440         * Requiring Stylus Usage will ignore boot mouse
 441         * X/Y values and some cases of invalid Digitizer X/Y
 442         * values commonly reported.
 443         */
 444         if (pen)
 445                 features->device_type |= WACOM_DEVICETYPE_PEN;
 446         else if (finger)
 447                 features->device_type |= WACOM_DEVICETYPE_TOUCH;
 448         else
 449                 return;
 450
 451         wacom_hid_usage_quirk(hdev, field, usage);
 452
 453         switch (equivalent_usage) {
 454         case HID_GD_X:
 455                 features->x_max = field->logical_maximum;
 456                 if (finger) {
 457                         features->x_phy = field->physical_maximum;
 458                         if ((features->type != BAMBOO_PT) &&
 459                             (features->type != BAMBOO_TOUCH)) {
 460                                 features->unit = field->unit;
 461                                 features->unitExpo = field->unit_exponent;
 462                         }
 463                 }
 464                 break;
 465         case HID_GD_Y:
 466                 features->y_max = field->logical_maximum;
 467                 if (finger) {
 468                         features->y_phy = field->physical_maximum;
 469                         if ((features->type != BAMBOO_PT) &&
 470                             (features->type != BAMBOO_TOUCH)) {
 471                                 features->unit = field->unit;
 472                                 features->unitExpo = field->unit_exponent;
 473                         }
 474                 }
 475                 break;
 476         case HID_DG_TIPPRESSURE:
 477                 if (pen)
 478                         features->pressure_max = field->logical_maximum;
 479                 break;
 480         }
 481
 482         if (features->type == HID_GENERIC)
 483                 wacom_wac_usage_mapping(hdev, field, usage);
 484 }
 485
 486 static void wacom_post_parse_hid(struct hid_device *hdev,
 487                                  struct wacom_features *features)
 488 {
 489         struct wacom *wacom = hid_get_drvdata(hdev);
 490         struct wacom_wac *wacom_wac = &wacom->wacom_wac;
 491
 492         if (features->type == HID_GENERIC) {
 493                 /* Any last-minute generic device setup */
 494                 if (wacom_wac->has_mode_change) {
 495                         if (wacom_wac->is_direct_mode)
 496                                 features->device_type |= WACOM_DEVICETYPE_DIRECT;
 497                         else
 498                                 features->device_type &= ~WACOM_DEVICETYPE_DIRECT;
 499                 }
 500
 501                 if (features->touch_max > 1) {
 502                         if (features->device_type & WACOM_DEVICETYPE_DIRECT)
 503                                 input_mt_init_slots(wacom_wac->touch_input,
 504                                                     wacom_wac->features.touch_max,
 505                                                     INPUT_MT_DIRECT);
 506                         else
 507                                 input_mt_init_slots(wacom_wac->touch_input,
 508                                                     wacom_wac->features.touch_max,
 509                                                     INPUT_MT_POINTER);
 510                 }
 511         }
 512 }
 513
 514 static void wacom_parse_hid(struct hid_device *hdev,
 515                            struct wacom_features *features)
 516 {
 517         struct hid_report_enum *rep_enum;
 518         struct hid_report *hreport;
 519         int i, j;
 520
 521         /* check features first */
 522         rep_enum = &hdev->report_enum[HID_FEATURE_REPORT];
 523         list_for_each_entry(hreport, &rep_enum->report_list, list) {
 524                 for (i = 0; i < hreport->maxfield; i++) {
 525                         /* Ignore if report count is out of bounds. */
 526                         if (hreport->field[i]->report_count < 1)
 527                                 continue;
 528
 529                         for (j = 0; j < hreport->field[i]->maxusage; j++) {
 530                                 wacom_feature_mapping(hdev, hreport->field[i],
 531                                                 hreport->field[i]->usage + j);
 532                         }
 533                 }
 534         }
 535
 536         /* now check the input usages */
 537         rep_enum = &hdev->report_enum[HID_INPUT_REPORT];
 538         list_for_each_entry(hreport, &rep_enum->report_list, list) {
 539
 540                 if (!hreport->maxfield)
 541                         continue;
 542
 543                 for (i = 0; i < hreport->maxfield; i++)
 544                         for (j = 0; j < hreport->field[i]->maxusage; j++)
 545                                 wacom_usage_mapping(hdev, hreport->field[i],
 546                                                 hreport->field[i]->usage + j);
 547         }
 548
 549         wacom_post_parse_hid(hdev, features);
 550 }
 551
 552 static int wacom_hid_set_device_mode(struct hid_device *hdev)
 553 {
 554         struct wacom *wacom = hid_get_drvdata(hdev);
 555         struct hid_data *hid_data = &wacom->wacom_wac.hid_data;
 556         struct hid_report *r;
 557         struct hid_report_enum *re;
 558
 559         if (hid_data->inputmode < 0)
 560                 return 0;
 561
 562         re = &(hdev->report_enum[HID_FEATURE_REPORT]);
 563         r = re->report_id_hash[hid_data->inputmode];
 564         if (r) {
 565                 r->field[0]->value[hid_data->inputmode_index] = 2;
 566                 hid_hw_request(hdev, r, HID_REQ_SET_REPORT);
 567         }
 568         return 0;
 569 }
 570
 571 static int wacom_set_device_mode(struct hid_device *hdev,
 572                                  struct wacom_wac *wacom_wac)
 573 {
 574         u8 *rep_data;
 575         struct hid_report *r;
 576         struct hid_report_enum *re;
 577         u32 length;
 578         int error = -ENOMEM, limit = 0;
 579
 580         if (wacom_wac->mode_report < 0)
 581                 return 0;
 582
 583         re = &(hdev->report_enum[HID_FEATURE_REPORT]);
 584         r = re->report_id_hash[wacom_wac->mode_report];
 585         if (!r)
 586                 return -EINVAL;
 587
 588         rep_data = hid_alloc_report_buf(r, GFP_KERNEL);
 589         if (!rep_data)
 590                 return -ENOMEM;
 591
 592         length = hid_report_len(r);
 593
 594         do {
 595                 rep_data[0] = wacom_wac->mode_report;
 596                 rep_data[1] = wacom_wac->mode_value;
 597
 598                 error = wacom_set_report(hdev, HID_FEATURE_REPORT, rep_data,
 599                                          length, 1);
 600                 if (error >= 0)
 601                         error = wacom_get_report(hdev, HID_FEATURE_REPORT,
 602                                                  rep_data, length, 1);
 603         } while (error >= 0 &&
 604                  rep_data[1] != wacom_wac->mode_report &&
 605                  limit++ < WAC_MSG_RETRIES);
 606
 607         kfree(rep_data);
 608
 609         return error < 0 ? error : 0;
 610 }
 611
 612 static int wacom_bt_query_tablet_data(struct hid_device *hdev, u8 speed,
 613                 struct wacom_features *features)
 614 {
 615         struct wacom *wacom = hid_get_drvdata(hdev);
 616         int ret;
 617         u8 rep_data[2];
 618
 619         switch (features->type) {
 620         case GRAPHIRE_BT:
 621                 rep_data[0] = 0x03;
 622                 rep_data[1] = 0x00;
 623                 ret = wacom_set_report(hdev, HID_FEATURE_REPORT, rep_data, 2,
 624                                         3);
 625
 626                 if (ret >= 0) {
 627                         rep_data[0] = speed == 0 ? 0x05 : 0x06;
 628                         rep_data[1] = 0x00;
 629
 630                         ret = wacom_set_report(hdev, HID_FEATURE_REPORT,
 631                                                 rep_data, 2, 3);
 632
 633                         if (ret >= 0) {
 634                                 wacom->wacom_wac.bt_high_speed = speed;
 635                                 return 0;
 636                         }
 637                 }
 638
 639                 /*
 640                  * Note that if the raw queries fail, it's not a hard failure
 641                  * and it is safe to continue
 642                  */
 643                 hid_warn(hdev, "failed to poke device, command %d, err %d\n",
 644                          rep_data[0], ret);
 645                 break;
 646         case INTUOS4WL:
 647                 if (speed == 1)
 648                         wacom->wacom_wac.bt_features &= ~0x20;
 649                 else
 650                         wacom->wacom_wac.bt_features |= 0x20;
 651
 652                 rep_data[0] = 0x03;
 653                 rep_data[1] = wacom->wacom_wac.bt_features;
 654
 655                 ret = wacom_set_report(hdev, HID_FEATURE_REPORT, rep_data, 2,
 656                                         1);
 657                 if (ret >= 0)
 658                         wacom->wacom_wac.bt_high_speed = speed;
 659                 break;
 660         }
 661
 662         return 0;
 663 }
 664
 665 /*
 666  * Switch the tablet into its most-capable mode. Wacom tablets are
 667  * typically configured to power-up in a mode which sends mouse-like
 668  * reports to the OS. To get absolute position, pressure data, etc.
 669  * from the tablet, it is necessary to switch the tablet out of this
 670  * mode and into one which sends the full range of tablet data.
 671  */
 672 static int _wacom_query_tablet_data(struct wacom *wacom)
 673 {
 674         struct hid_device *hdev = wacom->hdev;
 675         struct wacom_wac *wacom_wac = &wacom->wacom_wac;
 676         struct wacom_features *features = &wacom_wac->features;
 677
 678         if (hdev->bus == BUS_BLUETOOTH)
 679                 return wacom_bt_query_tablet_data(hdev, 1, features);
 680
 681         if (features->type != HID_GENERIC) {
 682                 if (features->device_type & WACOM_DEVICETYPE_TOUCH) {
 683                         if (features->type > TABLETPC) {
 684                                 /* MT Tablet PC touch */
 685                                 wacom_wac->mode_report = 3;
 686                                 wacom_wac->mode_value = 4;
 687                         } else if (features->type == WACOM_24HDT) {
 688                                 wacom_wac->mode_report = 18;
 689                                 wacom_wac->mode_value = 2;
 690                         } else if (features->type == WACOM_27QHDT) {
 691                                 wacom_wac->mode_report = 131;
 692                                 wacom_wac->mode_value = 2;
 693                         } else if (features->type == BAMBOO_PAD) {
 694                                 wacom_wac->mode_report = 2;
 695                                 wacom_wac->mode_value = 2;
 696                         }
 697                 } else if (features->device_type & WACOM_DEVICETYPE_PEN) {
 698                         if (features->type <= BAMBOO_PT) {
 699                                 wacom_wac->mode_report = 2;
 700                                 wacom_wac->mode_value = 2;
 701                         }
 702                 }
 703         }
 704
 705         wacom_set_device_mode(hdev, wacom_wac);
 706
 707         if (features->type == HID_GENERIC)
 708                 return wacom_hid_set_device_mode(hdev);
 709
 710         return 0;
 711 }
 712
 713 static void wacom_retrieve_hid_descriptor(struct hid_device *hdev,
 714                                          struct wacom_features *features)
 715 {
 716         struct wacom *wacom = hid_get_drvdata(hdev);
 717         struct usb_interface *intf = wacom->intf;
 718
 719         /* default features */
 720         features->x_fuzz = 4;
 721         features->y_fuzz = 4;
 722         features->pressure_fuzz = 0;
 723         features->distance_fuzz = 1;
 724         features->tilt_fuzz = 1;
 725
 726         /*
 727          * The wireless device HID is basic and layout conflicts with
 728          * other tablets (monitor and touch interface can look like pen).
 729          * Skip the query for this type and modify defaults based on
 730          * interface number.
 731          */
 732         if (features->type == WIRELESS && intf) {
 733                 if (intf->cur_altsetting->desc.bInterfaceNumber == 0)
 734                         features->device_type = WACOM_DEVICETYPE_WL_MONITOR;
 735                 else
 736                         features->device_type = WACOM_DEVICETYPE_NONE;
 737                 return;
 738         }
 739
 740         wacom_parse_hid(hdev, features);
 741 }
 742
 743 struct wacom_hdev_data {
 744         struct list_head list;
 745         struct kref kref;
 746         struct hid_device *dev;
 747         struct wacom_shared shared;
 748 };
 749
 750 static LIST_HEAD(wacom_udev_list);
 751 static DEFINE_MUTEX(wacom_udev_list_lock);
 752
 753 static bool wacom_are_sibling(struct hid_device *hdev,
 754                 struct hid_device *sibling)
 755 {
 756         struct wacom *wacom = hid_get_drvdata(hdev);
 757         struct wacom_features *features = &wacom->wacom_wac.features;
 758         struct wacom *sibling_wacom = hid_get_drvdata(sibling);
 759         struct wacom_features *sibling_features = &sibling_wacom->wacom_wac.features;
 760         __u32 oVid = features->oVid ? features->oVid : hdev->vendor;
 761         __u32 oPid = features->oPid ? features->oPid : hdev->product;
 762
 763         /* The defined oVid/oPid must match that of the sibling */
 764         if (features->oVid != HID_ANY_ID && sibling->vendor != oVid)
 765                 return false;
 766         if (features->oPid != HID_ANY_ID && sibling->product != oPid)
 767                 return false;
 768
 769         /*
 770          * Devices with the same VID/PID must share the same physical
 771          * device path, while those with different VID/PID must share
 772          * the same physical parent device path.
 773          */
 774         if (hdev->vendor == sibling->vendor && hdev->product == sibling->product) {
 775                 if (!hid_compare_device_paths(hdev, sibling, '/'))
 776                         return false;
 777         } else {
 778                 if (!hid_compare_device_paths(hdev, sibling, '.'))
 779                         return false;
 780         }
 781
 782         /* Skip the remaining heuristics unless you are a HID_GENERIC device */
 783         if (features->type != HID_GENERIC)
 784                 return true;
 785
 786         /*
 787          * Direct-input devices may not be siblings of indirect-input
 788          * devices.
 789          */
 790         if ((features->device_type & WACOM_DEVICETYPE_DIRECT) &&
 791             !(sibling_features->device_type & WACOM_DEVICETYPE_DIRECT))
 792                 return false;
 793
 794         /*
 795          * Indirect-input devices may not be siblings of direct-input
 796          * devices.
 797          */
 798         if (!(features->device_type & WACOM_DEVICETYPE_DIRECT) &&
 799             (sibling_features->device_type & WACOM_DEVICETYPE_DIRECT))
 800                 return false;
 801
 802         /* Pen devices may only be siblings of touch devices */
 803         if ((features->device_type & WACOM_DEVICETYPE_PEN) &&
 804             !(sibling_features->device_type & WACOM_DEVICETYPE_TOUCH))
 805                 return false;
 806
 807         /* Touch devices may only be siblings of pen devices */
 808         if ((features->device_type & WACOM_DEVICETYPE_TOUCH) &&
 809             !(sibling_features->device_type & WACOM_DEVICETYPE_PEN))
 810                 return false;
 811
 812         /*
 813          * No reason could be found for these two devices to NOT be
 814          * siblings, so there's a good chance they ARE siblings
 815          */
 816         return true;
 817 }
 818
 819 static struct wacom_hdev_data *wacom_get_hdev_data(struct hid_device *hdev)
 820 {
 821         struct wacom_hdev_data *data;
 822
 823         /* Try to find an already-probed interface from the same device */
 824         list_for_each_entry(data, &wacom_udev_list, list) {
 825                 if (hid_compare_device_paths(hdev, data->dev, '/')) {
 826                         kref_get(&data->kref);
 827                         return data;
 828                 }
 829         }
 830
 831         /* Fallback to finding devices that appear to be "siblings" */
 832         list_for_each_entry(data, &wacom_udev_list, list) {
 833                 if (wacom_are_sibling(hdev, data->dev)) {
 834                         kref_get(&data->kref);
 835                         return data;
 836                 }
 837         }
 838
 839         return NULL;
 840 }
 841
 842 static void wacom_release_shared_data(struct kref *kref)
 843 {
 844         struct wacom_hdev_data *data =
 845                 container_of(kref, struct wacom_hdev_data, kref);
 846
 847         mutex_lock(&wacom_udev_list_lock);
 848         list_del(&data->list);
 849         mutex_unlock(&wacom_udev_list_lock);
 850
 851         kfree(data);
 852 }
 853
 854 static void wacom_remove_shared_data(void *res)
 855 {
 856         struct wacom *wacom = res;
 857         struct wacom_hdev_data *data;
 858         struct wacom_wac *wacom_wac = &wacom->wacom_wac;
 859
 860         if (wacom_wac->shared) {
 861                 data = container_of(wacom_wac->shared, struct wacom_hdev_data,
 862                                     shared);
 863
 864                 if (wacom_wac->shared->touch == wacom->hdev)
 865                         wacom_wac->shared->touch = NULL;
 866                 else if (wacom_wac->shared->pen == wacom->hdev)
 867                         wacom_wac->shared->pen = NULL;
 868
 869                 kref_put(&data->kref, wacom_release_shared_data);
 870                 wacom_wac->shared = NULL;
 871         }
 872 }
 873
 874 static int wacom_add_shared_data(struct hid_device *hdev)
 875 {
 876         struct wacom *wacom = hid_get_drvdata(hdev);
 877         struct wacom_wac *wacom_wac = &wacom->wacom_wac;
 878         struct wacom_hdev_data *data;
 879         int retval = 0;
 880
 881         mutex_lock(&wacom_udev_list_lock);
 882
 883         data = wacom_get_hdev_data(hdev);
 884         if (!data) {
 885                 data = kzalloc(sizeof(struct wacom_hdev_data), GFP_KERNEL);
 886                 if (!data) {
 887                         retval = -ENOMEM;
 888                         goto out;
 889                 }
 890
 891                 kref_init(&data->kref);
 892                 data->dev = hdev;
 893                 list_add_tail(&data->list, &wacom_udev_list);
 894         }
 895
 896         wacom_wac->shared = &data->shared;
 897
 898         retval = devm_add_action(&hdev->dev, wacom_remove_shared_data, wacom);
 899         if (retval) {
 900                 mutex_unlock(&wacom_udev_list_lock);
 901                 wacom_remove_shared_data(wacom);
 902                 return retval;
 903         }
 904
 905         if (wacom_wac->features.device_type & WACOM_DEVICETYPE_TOUCH)
 906                 wacom_wac->shared->touch = hdev;
 907         else if (wacom_wac->features.device_type & WACOM_DEVICETYPE_PEN)
 908                 wacom_wac->shared->pen = hdev;
 909
 910 out:
 911         mutex_unlock(&wacom_udev_list_lock);
 912         return retval;
 913 }
 914
 915 static int wacom_led_control(struct wacom *wacom)
 916 {
 917         unsigned char *buf;
 918         int retval;
 919         unsigned char report_id = WAC_CMD_LED_CONTROL;
 920         int buf_size = 9;
 921
 922         if (!wacom->led.groups)
 923                 return -ENOTSUPP;
 924
 925         if (wacom->wacom_wac.features.type == REMOTE)
 926                 return -ENOTSUPP;
 927
 928         if (wacom->wacom_wac.pid) { /* wireless connected */
 929                 report_id = WAC_CMD_WL_LED_CONTROL;
 930                 buf_size = 13;
 931         }
 932         else if (wacom->wacom_wac.features.type == INTUOSP2_BT) {
 933                 report_id = WAC_CMD_WL_INTUOSP2;
 934                 buf_size = 51;
 935         }
 936         buf = kzalloc(buf_size, GFP_KERNEL);
 937         if (!buf)
 938                 return -ENOMEM;
 939
 940         if (wacom->wacom_wac.features.type == HID_GENERIC) {
 941                 buf[0] = WAC_CMD_LED_CONTROL_GENERIC;
 942                 buf[1] = wacom->led.llv;
 943                 buf[2] = wacom->led.groups[0].select & 0x03;
 944
 945         } else if ((wacom->wacom_wac.features.type >= INTUOS5S &&
 946             wacom->wacom_wac.features.type <= INTUOSPL)) {
 947                 /*
 948                  * Touch Ring and crop mark LED luminance may take on
 949                  * one of four values:
 950                  *    0 = Low; 1 = Medium; 2 = High; 3 = Off
 951                  */
 952                 int ring_led = wacom->led.groups[0].select & 0x03;
 953                 int ring_lum = (((wacom->led.llv & 0x60) >> 5) - 1) & 0x03;
 954                 int crop_lum = 0;
 955                 unsigned char led_bits = (crop_lum << 4) | (ring_lum << 2) | (ring_led);
 956
 957                 buf[0] = report_id;
 958                 if (wacom->wacom_wac.pid) {
 959                         wacom_get_report(wacom->hdev, HID_FEATURE_REPORT,
 960                                          buf, buf_size, WAC_CMD_RETRIES);
 961                         buf[0] = report_id;
 962                         buf[4] = led_bits;
 963                 } else
 964                         buf[1] = led_bits;
 965         }
 966         else if (wacom->wacom_wac.features.type == INTUOSP2_BT) {
 967                 buf[0] = report_id;
 968                 buf[4] = 100; // Power Connection LED (ORANGE)
 969                 buf[5] = 100; // BT Connection LED (BLUE)
 970                 buf[6] = 100; // Paper Mode (RED?)
 971                 buf[7] = 100; // Paper Mode (GREEN?)
 972                 buf[8] = 100; // Paper Mode (BLUE?)
 973                 buf[9] = wacom->led.llv;
 974                 buf[10] = wacom->led.groups[0].select & 0x03;
 975         }
 976         else {
 977                 int led = wacom->led.groups[0].select | 0x4;
 978
 979                 if (wacom->wacom_wac.features.type == WACOM_21UX2 ||
 980                     wacom->wacom_wac.features.type == WACOM_24HD)
 981                         led |= (wacom->led.groups[1].select << 4) | 0x40;
 982
 983                 buf[0] = report_id;
 984                 buf[1] = led;
 985                 buf[2] = wacom->led.llv;
 986                 buf[3] = wacom->led.hlv;
 987                 buf[4] = wacom->led.img_lum;
 988         }
 989
 990         retval = wacom_set_report(wacom->hdev, HID_FEATURE_REPORT, buf, buf_size,
 991                                   WAC_CMD_RETRIES);
 992         kfree(buf);
 993
 994         return retval;
 995 }
 996
 997 static int wacom_led_putimage(struct wacom *wacom, int button_id, u8 xfer_id,
 998                 const unsigned len, const void *img)
 999 {
1000         unsigned char *buf;
1001         int i, retval;
1002         const unsigned chunk_len = len / 4; /* 4 chunks are needed to be sent */
1003
1004         buf = kzalloc(chunk_len + 3 , GFP_KERNEL);
1005         if (!buf)
1006                 return -ENOMEM;
1007
1008         /* Send 'start' command */
1009         buf[0] = WAC_CMD_ICON_START;
1010         buf[1] = 1;
1011         retval = wacom_set_report(wacom->hdev, HID_FEATURE_REPORT, buf, 2,
1012                                   WAC_CMD_RETRIES);
1013         if (retval < 0)
1014                 goto out;
1015
1016         buf[0] = xfer_id;
1017         buf[1] = button_id & 0x07;
1018         for (i = 0; i < 4; i++) {
1019                 buf[2] = i;
1020                 memcpy(buf + 3, img + i * chunk_len, chunk_len);
1021
1022                 retval = wacom_set_report(wacom->hdev, HID_FEATURE_REPORT,
1023                                           buf, chunk_len + 3, WAC_CMD_RETRIES);
1024                 if (retval < 0)
1025                         break;
1026         }
1027
1028         /* Send 'stop' */
1029         buf[0] = WAC_CMD_ICON_START;
1030         buf[1] = 0;
1031         wacom_set_report(wacom->hdev, HID_FEATURE_REPORT, buf, 2,
1032                          WAC_CMD_RETRIES);
1033
1034 out:
1035         kfree(buf);
1036         return retval;
1037 }
1038
1039 static ssize_t wacom_led_select_store(struct device *dev, int set_id,
1040                                       const char *buf, size_t count)
1041 {
1042         struct hid_device *hdev = to_hid_device(dev);
1043         struct wacom *wacom = hid_get_drvdata(hdev);
1044         unsigned int id;
1045         int err;
1046
1047         err = kstrtouint(buf, 10, &id);
1048         if (err)
1049                 return err;
1050
1051         mutex_lock(&wacom->lock);
1052
1053         wacom->led.groups[set_id].select = id & 0x3;
1054         err = wacom_led_control(wacom);
1055
1056         mutex_unlock(&wacom->lock);
1057
1058         return err < 0 ? err : count;
1059 }
1060
1061 #define DEVICE_LED_SELECT_ATTR(SET_ID)                                  \
1062 static ssize_t wacom_led##SET_ID##_select_store(struct device *dev,     \
1063         struct device_attribute *attr, const char *buf, size_t count)   \
1064 {                                                                       \
1065         return wacom_led_select_store(dev, SET_ID, buf, count);         \
1066 }                                                                       \
1067 static ssize_t wacom_led##SET_ID##_select_show(struct device *dev,      \
1068         struct device_attribute *attr, char *buf)                       \
1069 {                                                                       \
1070         struct hid_device *hdev = to_hid_device(dev);\
1071         struct wacom *wacom = hid_get_drvdata(hdev);                    \
1072         return scnprintf(buf, PAGE_SIZE, "%d\n",                        \
1073                          wacom->led.groups[SET_ID].select);             \
1074 }                                                                       \
1075 static DEVICE_ATTR(status_led##SET_ID##_select, DEV_ATTR_RW_PERM,       \
1076                     wacom_led##SET_ID##_select_show,                    \
1077                     wacom_led##SET_ID##_select_store)
1078
1079 DEVICE_LED_SELECT_ATTR(0);
1080 DEVICE_LED_SELECT_ATTR(1);
1081
1082 static ssize_t wacom_luminance_store(struct wacom *wacom, u8 *dest,
1083                                      const char *buf, size_t count)
1084 {
1085         unsigned int value;
1086         int err;
1087
1088         err = kstrtouint(buf, 10, &value);
1089         if (err)
1090                 return err;
1091
1092         mutex_lock(&wacom->lock);
1093
1094         *dest = value & 0x7f;
1095         err = wacom_led_control(wacom);
1096
1097         mutex_unlock(&wacom->lock);
1098
1099         return err < 0 ? err : count;
1100 }
1101
1102 #define DEVICE_LUMINANCE_ATTR(name, field)                              \
1103 static ssize_t wacom_##name##_luminance_store(struct device *dev,       \
1104         struct device_attribute *attr, const char *buf, size_t count)   \
1105 {                                                                       \
1106         struct hid_device *hdev = to_hid_device(dev);\
1107         struct wacom *wacom = hid_get_drvdata(hdev);                    \
1108                                                                         \
1109         return wacom_luminance_store(wacom, &wacom->led.field,          \
1110                                      buf, count);                       \
1111 }                                                                       \
1112 static ssize_t wacom_##name##_luminance_show(struct device *dev,        \
1113         struct device_attribute *attr, char *buf)                       \
1114 {                                                                       \
1115         struct wacom *wacom = dev_get_drvdata(dev);                     \
1116         return scnprintf(buf, PAGE_SIZE, "%d\n", wacom->led.field);     \
1117 }                                                                       \
1118 static DEVICE_ATTR(name##_luminance, DEV_ATTR_RW_PERM,                  \
1119                    wacom_##name##_luminance_show,                       \
1120                    wacom_##name##_luminance_store)
1121
1122 DEVICE_LUMINANCE_ATTR(status0, llv);
1123 DEVICE_LUMINANCE_ATTR(status1, hlv);
1124 DEVICE_LUMINANCE_ATTR(buttons, img_lum);
1125
1126 static ssize_t wacom_button_image_store(struct device *dev, int button_id,
1127                                         const char *buf, size_t count)
1128 {
1129         struct hid_device *hdev = to_hid_device(dev);
1130         struct wacom *wacom = hid_get_drvdata(hdev);
1131         int err;
1132         unsigned len;
1133         u8 xfer_id;
1134
1135         if (hdev->bus == BUS_BLUETOOTH) {
1136                 len = 256;
1137                 xfer_id = WAC_CMD_ICON_BT_XFER;
1138         } else {
1139                 len = 1024;
1140                 xfer_id = WAC_CMD_ICON_XFER;
1141         }
1142
1143         if (count != len)
1144                 return -EINVAL;
1145
1146         mutex_lock(&wacom->lock);
1147
1148         err = wacom_led_putimage(wacom, button_id, xfer_id, len, buf);
1149
1150         mutex_unlock(&wacom->lock);
1151
1152         return err < 0 ? err : count;
1153 }
1154
1155 #define DEVICE_BTNIMG_ATTR(BUTTON_ID)                                   \
1156 static ssize_t wacom_btnimg##BUTTON_ID##_store(struct device *dev,      \
1157         struct device_attribute *attr, const char *buf, size_t count)   \
1158 {                                                                       \
1159         return wacom_button_image_store(dev, BUTTON_ID, buf, count);    \
1160 }                                                                       \
1161 static DEVICE_ATTR(button##BUTTON_ID##_rawimg, DEV_ATTR_WO_PERM,        \
1162                    NULL, wacom_btnimg##BUTTON_ID##_store)
1163
1164 DEVICE_BTNIMG_ATTR(0);
1165 DEVICE_BTNIMG_ATTR(1);
1166 DEVICE_BTNIMG_ATTR(2);
1167 DEVICE_BTNIMG_ATTR(3);
1168 DEVICE_BTNIMG_ATTR(4);
1169 DEVICE_BTNIMG_ATTR(5);
1170 DEVICE_BTNIMG_ATTR(6);
1171 DEVICE_BTNIMG_ATTR(7);
1172
1173 static struct attribute *cintiq_led_attrs[] = {
1174         &dev_attr_status_led0_select.attr,
1175         &dev_attr_status_led1_select.attr,
1176         NULL
1177 };
1178
1179 static struct attribute_group cintiq_led_attr_group = {
1180         .name = "wacom_led",
1181         .attrs = cintiq_led_attrs,
1182 };
1183
1184 static struct attribute *intuos4_led_attrs[] = {
1185         &dev_attr_status0_luminance.attr,
1186         &dev_attr_status1_luminance.attr,
1187         &dev_attr_status_led0_select.attr,
1188         &dev_attr_buttons_luminance.attr,
1189         &dev_attr_button0_rawimg.attr,
1190         &dev_attr_button1_rawimg.attr,
1191         &dev_attr_button2_rawimg.attr,
1192         &dev_attr_button3_rawimg.attr,
1193         &dev_attr_button4_rawimg.attr,
1194         &dev_attr_button5_rawimg.attr,
1195         &dev_attr_button6_rawimg.attr,
1196         &dev_attr_button7_rawimg.attr,
1197         NULL
1198 };
1199
1200 static struct attribute_group intuos4_led_attr_group = {
1201         .name = "wacom_led",
1202         .attrs = intuos4_led_attrs,
1203 };
1204
1205 static struct attribute *intuos5_led_attrs[] = {
1206         &dev_attr_status0_luminance.attr,
1207         &dev_attr_status_led0_select.attr,
1208         NULL
1209 };
1210
1211 static struct attribute_group intuos5_led_attr_group = {
1212         .name = "wacom_led",
1213         .attrs = intuos5_led_attrs,
1214 };
1215
1216 static struct attribute *generic_led_attrs[] = {
1217         &dev_attr_status0_luminance.attr,
1218         &dev_attr_status_led0_select.attr,
1219         NULL
1220 };
1221
1222 static struct attribute_group generic_led_attr_group = {
1223         .name = "wacom_led",
1224         .attrs = generic_led_attrs,
1225 };
1226
1227 struct wacom_sysfs_group_devres {
1228         struct attribute_group *group;
1229         struct kobject *root;
1230 };
1231
1232 static void wacom_devm_sysfs_group_release(struct device *dev, void *res)
1233 {
1234         struct wacom_sysfs_group_devres *devres = res;
1235         struct kobject *kobj = devres->root;
1236
1237         dev_dbg(dev, "%s: dropping reference to %s\n",
1238                 __func__, devres->group->name);
1239         sysfs_remove_group(kobj, devres->group);
1240 }
1241
1242 static int __wacom_devm_sysfs_create_group(struct wacom *wacom,
1243                                            struct kobject *root,
1244                                            struct attribute_group *group)
1245 {
1246         struct wacom_sysfs_group_devres *devres;
1247         int error;
1248
1249         devres = devres_alloc(wacom_devm_sysfs_group_release,
1250                               sizeof(struct wacom_sysfs_group_devres),
1251                               GFP_KERNEL);
1252         if (!devres)
1253                 return -ENOMEM;
1254
1255         devres->group = group;
1256         devres->root = root;
1257
1258         error = sysfs_create_group(devres->root, group);
1259         if (error) {
1260                 devres_free(devres);
1261                 return error;
1262         }
1263
1264         devres_add(&wacom->hdev->dev, devres);
1265
1266         return 0;
1267 }
1268
1269 static int wacom_devm_sysfs_create_group(struct wacom *wacom,
1270                                          struct attribute_group *group)
1271 {
1272         return __wacom_devm_sysfs_create_group(wacom, &wacom->hdev->dev.kobj,
1273                                                group);
1274 }
1275
1276 static void wacom_devm_kfifo_release(struct device *dev, void *res)
1277 {
1278         struct kfifo_rec_ptr_2 *devres = res;
1279
1280         kfifo_free(devres);
1281 }
1282
1283 static int wacom_devm_kfifo_alloc(struct wacom *wacom)
1284 {
1285         struct wacom_wac *wacom_wac = &wacom->wacom_wac;
1286         struct kfifo_rec_ptr_2 *pen_fifo;
1287         int error;
1288
1289         pen_fifo = devres_alloc(wacom_devm_kfifo_release,
1290                               sizeof(struct kfifo_rec_ptr_2),
1291                               GFP_KERNEL);
1292
1293         if (!pen_fifo)
1294                 return -ENOMEM;
1295
1296         error = kfifo_alloc(pen_fifo, WACOM_PKGLEN_MAX, GFP_KERNEL);
1297         if (error) {
1298                 devres_free(pen_fifo);
1299                 return error;
1300         }
1301
1302         devres_add(&wacom->hdev->dev, pen_fifo);
1303         wacom_wac->pen_fifo = pen_fifo;
1304
1305         return 0;
1306 }
1307
1308 enum led_brightness wacom_leds_brightness_get(struct wacom_led *led)
1309 {
1310         struct wacom *wacom = led->wacom;
1311
1312         if (wacom->led.max_hlv)
1313                 return led->hlv * LED_FULL / wacom->led.max_hlv;
1314
1315         if (wacom->led.max_llv)
1316                 return led->llv * LED_FULL / wacom->led.max_llv;
1317
1318         /* device doesn't support brightness tuning */
1319         return LED_FULL;
1320 }
1321
1322 static enum led_brightness __wacom_led_brightness_get(struct led_classdev *cdev)
1323 {
1324         struct wacom_led *led = container_of(cdev, struct wacom_led, cdev);
1325         struct wacom *wacom = led->wacom;
1326
1327         if (wacom->led.groups[led->group].select != led->id)
1328                 return LED_OFF;
1329
1330         return wacom_leds_brightness_get(led);
1331 }
1332
1333 static int wacom_led_brightness_set(struct led_classdev *cdev,
1334                                     enum led_brightness brightness)
1335 {
1336         struct wacom_led *led = container_of(cdev, struct wacom_led, cdev);
1337         struct wacom *wacom = led->wacom;
1338         int error;
1339
1340         mutex_lock(&wacom->lock);
1341
1342         if (!wacom->led.groups || (brightness == LED_OFF &&
1343             wacom->led.groups[led->group].select != led->id)) {
1344                 error = 0;
1345                 goto out;
1346         }
1347
1348         led->llv = wacom->led.llv = wacom->led.max_llv * brightness / LED_FULL;
1349         led->hlv = wacom->led.hlv = wacom->led.max_hlv * brightness / LED_FULL;
1350
1351         wacom->led.groups[led->group].select = led->id;
1352
1353         error = wacom_led_control(wacom);
1354
1355 out:
1356         mutex_unlock(&wacom->lock);
1357
1358         return error;
1359 }
1360
1361 static void wacom_led_readonly_brightness_set(struct led_classdev *cdev,
1362                                                enum led_brightness brightness)
1363 {
1364 }
1365
1366 static int wacom_led_register_one(struct device *dev, struct wacom *wacom,
1367                                   struct wacom_led *led, unsigned int group,
1368                                   unsigned int id, bool read_only)
1369 {
1370         int error;
1371         char *name;
1372
1373         name = devm_kasprintf(dev, GFP_KERNEL,
1374                               "%s::wacom-%d.%d",
1375                               dev_name(dev),
1376                               group,
1377                               id);
1378         if (!name)
1379                 return -ENOMEM;
1380
1381         if (!read_only) {
1382                 led->trigger.name = name;
1383                 error = devm_led_trigger_register(dev, &led->trigger);
1384                 if (error) {
1385                         hid_err(wacom->hdev,
1386                                 "failed to register LED trigger %s: %d\n",
1387                                 led->cdev.name, error);
1388                         return error;
1389                 }
1390         }
1391
1392         led->group = group;
1393         led->id = id;
1394         led->wacom = wacom;
1395         led->llv = wacom->led.llv;
1396         led->hlv = wacom->led.hlv;
1397         led->cdev.name = name;
1398         led->cdev.max_brightness = LED_FULL;
1399         led->cdev.flags = LED_HW_PLUGGABLE;
1400         led->cdev.brightness_get = __wacom_led_brightness_get;
1401         if (!read_only) {
1402                 led->cdev.brightness_set_blocking = wacom_led_brightness_set;
1403                 led->cdev.default_trigger = led->cdev.name;
1404         } else {
1405                 led->cdev.brightness_set = wacom_led_readonly_brightness_set;
1406         }
1407
1408         error = devm_led_classdev_register(dev, &led->cdev);
1409         if (error) {
1410                 hid_err(wacom->hdev,
1411                         "failed to register LED %s: %d\n",
1412                         led->cdev.name, error);
1413                 led->cdev.name = NULL;
1414                 return error;
1415         }
1416
1417         return 0;
1418 }
1419
1420 static void wacom_led_groups_release_one(void *data)
1421 {
1422         struct wacom_group_leds *group = data;
1423
1424         devres_release_group(group->dev, group);
1425 }
1426
1427 static int wacom_led_groups_alloc_and_register_one(struct device *dev,
1428                                                    struct wacom *wacom,
1429                                                    int group_id, int count,
1430                                                    bool read_only)
1431 {
1432         struct wacom_led *leds;
1433         int i, error;
1434
1435         if (group_id >= wacom->led.count || count <= 0)
1436                 return -EINVAL;
1437
1438         if (!devres_open_group(dev, &wacom->led.groups[group_id], GFP_KERNEL))
1439                 return -ENOMEM;
1440
1441         leds = devm_kcalloc(dev, count, sizeof(struct wacom_led), GFP_KERNEL);
1442         if (!leds) {
1443                 error = -ENOMEM;
1444                 goto err;
1445         }
1446
1447         wacom->led.groups[group_id].leds = leds;
1448         wacom->led.groups[group_id].count = count;
1449
1450         for (i = 0; i < count; i++) {
1451                 error = wacom_led_register_one(dev, wacom, &leds[i],
1452                                                group_id, i, read_only);
1453                 if (error)
1454                         goto err;
1455         }
1456
1457         wacom->led.groups[group_id].dev = dev;
1458
1459         devres_close_group(dev, &wacom->led.groups[group_id]);
1460
1461         /*
1462          * There is a bug (?) in devm_led_classdev_register() in which its
1463          * increments the refcount of the parent. If the parent is an input
1464          * device, that means the ref count never reaches 0 when
1465          * devm_input_device_release() gets called.
1466          * This means that the LEDs are still there after disconnect.
1467          * Manually force the release of the group so that the leds are released
1468          * once we are done using them.
1469          */
1470         error = devm_add_action_or_reset(&wacom->hdev->dev,
1471                                          wacom_led_groups_release_one,
1472                                          &wacom->led.groups[group_id]);
1473         if (error)
1474                 return error;
1475
1476         return 0;
1477
1478 err:
1479         devres_release_group(dev, &wacom->led.groups[group_id]);
1480         return error;
1481 }
1482
1483 struct wacom_led *wacom_led_find(struct wacom *wacom, unsigned int group_id,
1484                                  unsigned int id)
1485 {
1486         struct wacom_group_leds *group;
1487
1488         if (group_id >= wacom->led.count)
1489                 return NULL;
1490
1491         group = &wacom->led.groups[group_id];
1492
1493         if (!group->leds)
1494                 return NULL;
1495
1496         id %= group->count;
1497
1498         return &group->leds[id];
1499 }
1500
1501 /**
1502  * wacom_led_next: gives the next available led with a wacom trigger.
1503  *
1504  * returns the next available struct wacom_led which has its default trigger
1505  * or the current one if none is available.
1506  */
1507 struct wacom_led *wacom_led_next(struct wacom *wacom, struct wacom_led *cur)
1508 {
1509         struct wacom_led *next_led;
1510         int group, next;
1511
1512         if (!wacom || !cur)
1513                 return NULL;
1514
1515         group = cur->group;
1516         next = cur->id;
1517
1518         do {
1519                 next_led = wacom_led_find(wacom, group, ++next);
1520                 if (!next_led || next_led == cur)
1521                         return next_led;
1522         } while (next_led->cdev.trigger != &next_led->trigger);
1523
1524         return next_led;
1525 }
1526
1527 static void wacom_led_groups_release(void *data)
1528 {
1529         struct wacom *wacom = data;
1530
1531         wacom->led.groups = NULL;
1532         wacom->led.count = 0;
1533 }
1534
1535 static int wacom_led_groups_allocate(struct wacom *wacom, int count)
1536 {
1537         struct device *dev = &wacom->hdev->dev;
1538         struct wacom_group_leds *groups;
1539         int error;
1540
1541         groups = devm_kcalloc(dev, count, sizeof(struct wacom_group_leds),
1542                               GFP_KERNEL);
1543         if (!groups)
1544                 return -ENOMEM;
1545
1546         error = devm_add_action_or_reset(dev, wacom_led_groups_release, wacom);
1547         if (error)
1548                 return error;
1549
1550         wacom->led.groups = groups;
1551         wacom->led.count = count;
1552
1553         return 0;
1554 }
1555
1556 static int wacom_leds_alloc_and_register(struct wacom *wacom, int group_count,
1557                                          int led_per_group, bool read_only)
1558 {
1559         struct device *dev;
1560         int i, error;
1561
1562         if (!wacom->wacom_wac.pad_input)
1563                 return -EINVAL;
1564
1565         dev = &wacom->wacom_wac.pad_input->dev;
1566
1567         error = wacom_led_groups_allocate(wacom, group_count);
1568         if (error)
1569                 return error;
1570
1571         for (i = 0; i < group_count; i++) {
1572                 error = wacom_led_groups_alloc_and_register_one(dev, wacom, i,
1573                                                                 led_per_group,
1574                                                                 read_only);
1575                 if (error)
1576                         return error;
1577         }
1578
1579         return 0;
1580 }
1581
1582 int wacom_initialize_leds(struct wacom *wacom)
1583 {
1584         int error;
1585
1586         if (!(wacom->wacom_wac.features.device_type & WACOM_DEVICETYPE_PAD))
1587                 return 0;
1588
1589         /* Initialize default values */
1590         switch (wacom->wacom_wac.features.type) {
1591         case HID_GENERIC:
1592                 if (!wacom->generic_has_leds)
1593                         return 0;
1594                 wacom->led.llv = 100;
1595                 wacom->led.max_llv = 100;
1596
1597                 error = wacom_leds_alloc_and_register(wacom, 1, 4, false);
1598                 if (error) {
1599                         hid_err(wacom->hdev,
1600                                 "cannot create leds err: %d\n", error);
1601                         return error;
1602                 }
1603
1604                 error = wacom_devm_sysfs_create_group(wacom,
1605                                                       &generic_led_attr_group);
1606                 break;
1607
1608         case INTUOS4S:
1609         case INTUOS4:
1610         case INTUOS4WL:
1611         case INTUOS4L:
1612                 wacom->led.llv = 10;
1613                 wacom->led.hlv = 20;
1614                 wacom->led.max_llv = 127;
1615                 wacom->led.max_hlv = 127;
1616                 wacom->led.img_lum = 10;
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                                                       &intuos4_led_attr_group);
1627                 break;
1628
1629         case WACOM_24HD:
1630         case WACOM_21UX2:
1631                 wacom->led.llv = 0;
1632                 wacom->led.hlv = 0;
1633                 wacom->led.img_lum = 0;
1634
1635                 error = wacom_leds_alloc_and_register(wacom, 2, 4, false);
1636                 if (error) {
1637                         hid_err(wacom->hdev,
1638                                 "cannot create leds err: %d\n", error);
1639                         return error;
1640                 }
1641
1642                 error = wacom_devm_sysfs_create_group(wacom,
1643                                                       &cintiq_led_attr_group);
1644                 break;
1645
1646         case INTUOS5S:
1647         case INTUOS5:
1648         case INTUOS5L:
1649         case INTUOSPS:
1650         case INTUOSPM:
1651         case INTUOSPL:
1652                 wacom->led.llv = 32;
1653                 wacom->led.max_llv = 96;
1654
1655                 error = wacom_leds_alloc_and_register(wacom, 1, 4, false);
1656                 if (error) {
1657                         hid_err(wacom->hdev,
1658                                 "cannot create leds err: %d\n", error);
1659                         return error;
1660                 }
1661
1662                 error = wacom_devm_sysfs_create_group(wacom,
1663                                                       &intuos5_led_attr_group);
1664                 break;
1665
1666         case INTUOSP2_BT:
1667                 wacom->led.llv = 50;
1668                 wacom->led.max_llv = 100;
1669                 error = wacom_leds_alloc_and_register(wacom, 1, 4, false);
1670                 if (error) {
1671                         hid_err(wacom->hdev,
1672                                 "cannot create leds err: %d\n", error);
1673                         return error;
1674                 }
1675                 return 0;
1676
1677         case REMOTE:
1678                 wacom->led.llv = 255;
1679                 wacom->led.max_llv = 255;
1680                 error = wacom_led_groups_allocate(wacom, 5);
1681                 if (error) {
1682                         hid_err(wacom->hdev,
1683                                 "cannot create leds err: %d\n", error);
1684                         return error;
1685                 }
1686                 return 0;
1687
1688         default:
1689                 return 0;
1690         }
1691
1692         if (error) {
1693                 hid_err(wacom->hdev,
1694                         "cannot create sysfs group err: %d\n", error);
1695                 return error;
1696         }
1697
1698         return 0;
1699 }
1700
1701 static void wacom_init_work(struct work_struct *work)
1702 {
1703         struct wacom *wacom = container_of(work, struct wacom, init_work.work);
1704
1705         _wacom_query_tablet_data(wacom);
1706         wacom_led_control(wacom);
1707 }
1708
1709 static void wacom_query_tablet_data(struct wacom *wacom)
1710 {
1711         schedule_delayed_work(&wacom->init_work, msecs_to_jiffies(1000));
1712 }
1713
1714 static enum power_supply_property wacom_battery_props[] = {
1715         POWER_SUPPLY_PROP_MODEL_NAME,
1716         POWER_SUPPLY_PROP_PRESENT,
1717         POWER_SUPPLY_PROP_STATUS,
1718         POWER_SUPPLY_PROP_SCOPE,
1719         POWER_SUPPLY_PROP_CAPACITY
1720 };
1721
1722 static int wacom_battery_get_property(struct power_supply *psy,
1723                                       enum power_supply_property psp,
1724                                       union power_supply_propval *val)
1725 {
1726         struct wacom_battery *battery = power_supply_get_drvdata(psy);
1727         int ret = 0;
1728
1729         switch (psp) {
1730                 case POWER_SUPPLY_PROP_MODEL_NAME:
1731                         val->strval = battery->wacom->wacom_wac.name;
1732                         break;
1733                 case POWER_SUPPLY_PROP_PRESENT:
1734                         val->intval = battery->bat_connected;
1735                         break;
1736                 case POWER_SUPPLY_PROP_SCOPE:
1737                         val->intval = POWER_SUPPLY_SCOPE_DEVICE;
1738                         break;
1739                 case POWER_SUPPLY_PROP_CAPACITY:
1740                         val->intval = battery->battery_capacity;
1741                         break;
1742                 case POWER_SUPPLY_PROP_STATUS:
1743                         if (battery->bat_status != WACOM_POWER_SUPPLY_STATUS_AUTO)
1744                                 val->intval = battery->bat_status;
1745                         else if (battery->bat_charging)
1746                                 val->intval = POWER_SUPPLY_STATUS_CHARGING;
1747                         else if (battery->battery_capacity == 100 &&
1748                                     battery->ps_connected)
1749                                 val->intval = POWER_SUPPLY_STATUS_FULL;
1750                         else if (battery->ps_connected)
1751                                 val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING;
1752                         else
1753                                 val->intval = POWER_SUPPLY_STATUS_DISCHARGING;
1754                         break;
1755                 default:
1756                         ret = -EINVAL;
1757                         break;
1758         }
1759
1760         return ret;
1761 }
1762
1763 static int __wacom_initialize_battery(struct wacom *wacom,
1764                                       struct wacom_battery *battery)
1765 {
1766         static atomic_t battery_no = ATOMIC_INIT(0);
1767         struct device *dev = &wacom->hdev->dev;
1768         struct power_supply_config psy_cfg = { .drv_data = battery, };
1769         struct power_supply *ps_bat;
1770         struct power_supply_desc *bat_desc = &battery->bat_desc;
1771         unsigned long n;
1772         int error;
1773
1774         if (!devres_open_group(dev, bat_desc, GFP_KERNEL))
1775                 return -ENOMEM;
1776
1777         battery->wacom = wacom;
1778
1779         n = atomic_inc_return(&battery_no) - 1;
1780
1781         bat_desc->properties = wacom_battery_props;
1782         bat_desc->num_properties = ARRAY_SIZE(wacom_battery_props);
1783         bat_desc->get_property = wacom_battery_get_property;
1784         sprintf(battery->bat_name, "wacom_battery_%ld", n);
1785         bat_desc->name = battery->bat_name;
1786         bat_desc->type = POWER_SUPPLY_TYPE_USB;
1787         bat_desc->use_for_apm = 0;
1788
1789         ps_bat = devm_power_supply_register(dev, bat_desc, &psy_cfg);
1790         if (IS_ERR(ps_bat)) {
1791                 error = PTR_ERR(ps_bat);
1792                 goto err;
1793         }
1794
1795         power_supply_powers(ps_bat, &wacom->hdev->dev);
1796
1797         battery->battery = ps_bat;
1798
1799         devres_close_group(dev, bat_desc);
1800         return 0;
1801
1802 err:
1803         devres_release_group(dev, bat_desc);
1804         return error;
1805 }
1806
1807 static int wacom_initialize_battery(struct wacom *wacom)
1808 {
1809         if (wacom->wacom_wac.features.quirks & WACOM_QUIRK_BATTERY)
1810                 return __wacom_initialize_battery(wacom, &wacom->battery);
1811
1812         return 0;
1813 }
1814
1815 static void wacom_destroy_battery(struct wacom *wacom)
1816 {
1817         if (wacom->battery.battery) {
1818                 devres_release_group(&wacom->hdev->dev,
1819                                      &wacom->battery.bat_desc);
1820                 wacom->battery.battery = NULL;
1821         }
1822 }
1823
1824 static ssize_t wacom_show_speed(struct device *dev,
1825                                 struct device_attribute
1826                                 *attr, char *buf)
1827 {
1828         struct hid_device *hdev = to_hid_device(dev);
1829         struct wacom *wacom = hid_get_drvdata(hdev);
1830
1831         return snprintf(buf, PAGE_SIZE, "%i\n", wacom->wacom_wac.bt_high_speed);
1832 }
1833
1834 static ssize_t wacom_store_speed(struct device *dev,
1835                                 struct device_attribute *attr,
1836                                 const char *buf, size_t count)
1837 {
1838         struct hid_device *hdev = to_hid_device(dev);
1839         struct wacom *wacom = hid_get_drvdata(hdev);
1840         u8 new_speed;
1841
1842         if (kstrtou8(buf, 0, &new_speed))
1843                 return -EINVAL;
1844
1845         if (new_speed != 0 && new_speed != 1)
1846                 return -EINVAL;
1847
1848         wacom_bt_query_tablet_data(hdev, new_speed, &wacom->wacom_wac.features);
1849
1850         return count;
1851 }
1852
1853 static DEVICE_ATTR(speed, DEV_ATTR_RW_PERM,
1854                 wacom_show_speed, wacom_store_speed);
1855
1856
1857 static ssize_t wacom_show_remote_mode(struct kobject *kobj,
1858                                       struct kobj_attribute *kattr,
1859                                       char *buf, int index)
1860 {
1861         struct device *dev = kobj_to_dev(kobj->parent);
1862         struct hid_device *hdev = to_hid_device(dev);
1863         struct wacom *wacom = hid_get_drvdata(hdev);
1864         u8 mode;
1865
1866         mode = wacom->led.groups[index].select;
1867         return sprintf(buf, "%d\n", mode < 3 ? mode : -1);
1868 }
1869
1870 #define DEVICE_EKR_ATTR_GROUP(SET_ID)                                   \
1871 static ssize_t wacom_show_remote##SET_ID##_mode(struct kobject *kobj,   \
1872                                struct kobj_attribute *kattr, char *buf) \
1873 {                                                                       \
1874         return wacom_show_remote_mode(kobj, kattr, buf, SET_ID);        \
1875 }                                                                       \
1876 static struct kobj_attribute remote##SET_ID##_mode_attr = {             \
1877         .attr = {.name = "remote_mode",                                 \
1878                 .mode = DEV_ATTR_RO_PERM},                              \
1879         .show = wacom_show_remote##SET_ID##_mode,                       \
1880 };                                                                      \
1881 static struct attribute *remote##SET_ID##_serial_attrs[] = {            \
1882         &remote##SET_ID##_mode_attr.attr,                               \
1883         NULL                                                            \
1884 };                                                                      \
1885 static struct attribute_group remote##SET_ID##_serial_group = {         \
1886         .name = NULL,                                                   \
1887         .attrs = remote##SET_ID##_serial_attrs,                         \
1888 }
1889
1890 DEVICE_EKR_ATTR_GROUP(0);
1891 DEVICE_EKR_ATTR_GROUP(1);
1892 DEVICE_EKR_ATTR_GROUP(2);
1893 DEVICE_EKR_ATTR_GROUP(3);
1894 DEVICE_EKR_ATTR_GROUP(4);
1895
1896 static int wacom_remote_create_attr_group(struct wacom *wacom, __u32 serial,
1897                                           int index)
1898 {
1899         int error = 0;
1900         struct wacom_remote *remote = wacom->remote;
1901
1902         remote->remotes[index].group.name = devm_kasprintf(&wacom->hdev->dev,
1903                                                           GFP_KERNEL,
1904                                                           "%d", serial);
1905         if (!remote->remotes[index].group.name)
1906                 return -ENOMEM;
1907
1908         error = __wacom_devm_sysfs_create_group(wacom, remote->remote_dir,
1909                                                 &remote->remotes[index].group);
1910         if (error) {
1911                 remote->remotes[index].group.name = NULL;
1912                 hid_err(wacom->hdev,
1913                         "cannot create sysfs group err: %d\n", error);
1914                 return error;
1915         }
1916
1917         return 0;
1918 }
1919
1920 static int wacom_cmd_unpair_remote(struct wacom *wacom, unsigned char selector)
1921 {
1922         const size_t buf_size = 2;
1923         unsigned char *buf;
1924         int retval;
1925
1926         buf = kzalloc(buf_size, GFP_KERNEL);
1927         if (!buf)
1928                 return -ENOMEM;
1929
1930         buf[0] = WAC_CMD_DELETE_PAIRING;
1931         buf[1] = selector;
1932
1933         retval = wacom_set_report(wacom->hdev, HID_OUTPUT_REPORT, buf,
1934                                   buf_size, WAC_CMD_RETRIES);
1935         kfree(buf);
1936
1937         return retval;
1938 }
1939
1940 static ssize_t wacom_store_unpair_remote(struct kobject *kobj,
1941                                          struct kobj_attribute *attr,
1942                                          const char *buf, size_t count)
1943 {
1944         unsigned char selector = 0;
1945         struct device *dev = kobj_to_dev(kobj->parent);
1946         struct hid_device *hdev = to_hid_device(dev);
1947         struct wacom *wacom = hid_get_drvdata(hdev);
1948         int err;
1949
1950         if (!strncmp(buf, "*\n", 2)) {
1951                 selector = WAC_CMD_UNPAIR_ALL;
1952         } else {
1953                 hid_info(wacom->hdev, "remote: unrecognized unpair code: %s\n",
1954                          buf);
1955                 return -1;
1956         }
1957
1958         mutex_lock(&wacom->lock);
1959
1960         err = wacom_cmd_unpair_remote(wacom, selector);
1961         mutex_unlock(&wacom->lock);
1962
1963         return err < 0 ? err : count;
1964 }
1965
1966 static struct kobj_attribute unpair_remote_attr = {
1967         .attr = {.name = "unpair_remote", .mode = 0200},
1968         .store = wacom_store_unpair_remote,
1969 };
1970
1971 static const struct attribute *remote_unpair_attrs[] = {
1972         &unpair_remote_attr.attr,
1973         NULL
1974 };
1975
1976 static void wacom_remotes_destroy(void *data)
1977 {
1978         struct wacom *wacom = data;
1979         struct wacom_remote *remote = wacom->remote;
1980
1981         if (!remote)
1982                 return;
1983
1984         kobject_put(remote->remote_dir);
1985         kfifo_free(&remote->remote_fifo);
1986         wacom->remote = NULL;
1987 }
1988
1989 static int wacom_initialize_remotes(struct wacom *wacom)
1990 {
1991         int error = 0;
1992         struct wacom_remote *remote;
1993         int i;
1994
1995         if (wacom->wacom_wac.features.type != REMOTE)
1996                 return 0;
1997
1998         remote = devm_kzalloc(&wacom->hdev->dev, sizeof(*wacom->remote),
1999                               GFP_KERNEL);
2000         if (!remote)
2001                 return -ENOMEM;
2002
2003         wacom->remote = remote;
2004
2005         spin_lock_init(&remote->remote_lock);
2006
2007         error = kfifo_alloc(&remote->remote_fifo,
2008                         5 * sizeof(struct wacom_remote_data),
2009                         GFP_KERNEL);
2010         if (error) {
2011                 hid_err(wacom->hdev, "failed allocating remote_fifo\n");
2012                 return -ENOMEM;
2013         }
2014
2015         remote->remotes[0].group = remote0_serial_group;
2016         remote->remotes[1].group = remote1_serial_group;
2017         remote->remotes[2].group = remote2_serial_group;
2018         remote->remotes[3].group = remote3_serial_group;
2019         remote->remotes[4].group = remote4_serial_group;
2020
2021         remote->remote_dir = kobject_create_and_add("wacom_remote",
2022                                                     &wacom->hdev->dev.kobj);
2023         if (!remote->remote_dir)
2024                 return -ENOMEM;
2025
2026         error = sysfs_create_files(remote->remote_dir, remote_unpair_attrs);
2027
2028         if (error) {
2029                 hid_err(wacom->hdev,
2030                         "cannot create sysfs group err: %d\n", error);
2031                 return error;
2032         }
2033
2034         for (i = 0; i < WACOM_MAX_REMOTES; i++) {
2035                 wacom->led.groups[i].select = WACOM_STATUS_UNKNOWN;
2036                 remote->remotes[i].serial = 0;
2037         }
2038
2039         error = devm_add_action_or_reset(&wacom->hdev->dev,
2040                                          wacom_remotes_destroy, wacom);
2041         if (error)
2042                 return error;
2043
2044         return 0;
2045 }
2046
2047 static struct input_dev *wacom_allocate_input(struct wacom *wacom)
2048 {
2049         struct input_dev *input_dev;
2050         struct hid_device *hdev = wacom->hdev;
2051         struct wacom_wac *wacom_wac = &(wacom->wacom_wac);
2052
2053         input_dev = devm_input_allocate_device(&hdev->dev);
2054         if (!input_dev)
2055                 return NULL;
2056
2057         input_dev->name = wacom_wac->features.name;
2058         input_dev->phys = hdev->phys;
2059         input_dev->dev.parent = &hdev->dev;
2060         input_dev->open = wacom_open;
2061         input_dev->close = wacom_close;
2062         input_dev->uniq = hdev->uniq;
2063         input_dev->id.bustype = hdev->bus;
2064         input_dev->id.vendor  = hdev->vendor;
2065         input_dev->id.product = wacom_wac->pid ? wacom_wac->pid : hdev->product;
2066         input_dev->id.version = hdev->version;
2067         input_set_drvdata(input_dev, wacom);
2068
2069         return input_dev;
2070 }
2071
2072 static int wacom_allocate_inputs(struct wacom *wacom)
2073 {
2074         struct wacom_wac *wacom_wac = &(wacom->wacom_wac);
2075
2076         wacom_wac->pen_input = wacom_allocate_input(wacom);
2077         wacom_wac->touch_input = wacom_allocate_input(wacom);
2078         wacom_wac->pad_input = wacom_allocate_input(wacom);
2079         if (!wacom_wac->pen_input ||
2080             !wacom_wac->touch_input ||
2081             !wacom_wac->pad_input)
2082                 return -ENOMEM;
2083
2084         wacom_wac->pen_input->name = wacom_wac->pen_name;
2085         wacom_wac->touch_input->name = wacom_wac->touch_name;
2086         wacom_wac->pad_input->name = wacom_wac->pad_name;
2087
2088         return 0;
2089 }
2090
2091 static int wacom_setup_inputs(struct wacom *wacom)
2092 {
2093         struct input_dev *pen_input_dev, *touch_input_dev, *pad_input_dev;
2094         struct wacom_wac *wacom_wac = &(wacom->wacom_wac);
2095         int error = 0;
2096
2097         pen_input_dev = wacom_wac->pen_input;
2098         touch_input_dev = wacom_wac->touch_input;
2099         pad_input_dev = wacom_wac->pad_input;
2100
2101         if (!pen_input_dev || !touch_input_dev || !pad_input_dev)
2102                 return -EINVAL;
2103
2104         error = wacom_setup_pen_input_capabilities(pen_input_dev, wacom_wac);
2105         if (error) {
2106                 /* no pen in use on this interface */
2107                 input_free_device(pen_input_dev);
2108                 wacom_wac->pen_input = NULL;
2109                 pen_input_dev = NULL;
2110         }
2111
2112         error = wacom_setup_touch_input_capabilities(touch_input_dev, wacom_wac);
2113         if (error) {
2114                 /* no touch in use on this interface */
2115                 input_free_device(touch_input_dev);
2116                 wacom_wac->touch_input = NULL;
2117                 touch_input_dev = NULL;
2118         }
2119
2120         error = wacom_setup_pad_input_capabilities(pad_input_dev, wacom_wac);
2121         if (error) {
2122                 /* no pad events using this interface */
2123                 input_free_device(pad_input_dev);
2124                 wacom_wac->pad_input = NULL;
2125                 pad_input_dev = NULL;
2126         }
2127
2128         return 0;
2129 }
2130
2131 static int wacom_register_inputs(struct wacom *wacom)
2132 {
2133         struct input_dev *pen_input_dev, *touch_input_dev, *pad_input_dev;
2134         struct wacom_wac *wacom_wac = &(wacom->wacom_wac);
2135         int error = 0;
2136
2137         pen_input_dev = wacom_wac->pen_input;
2138         touch_input_dev = wacom_wac->touch_input;
2139         pad_input_dev = wacom_wac->pad_input;
2140
2141         if (pen_input_dev) {
2142                 error = input_register_device(pen_input_dev);
2143                 if (error)
2144                         goto fail;
2145         }
2146
2147         if (touch_input_dev) {
2148                 error = input_register_device(touch_input_dev);
2149                 if (error)
2150                         goto fail;
2151         }
2152
2153         if (pad_input_dev) {
2154                 error = input_register_device(pad_input_dev);
2155                 if (error)
2156                         goto fail;
2157         }
2158
2159         return 0;
2160
2161 fail:
2162         wacom_wac->pad_input = NULL;
2163         wacom_wac->touch_input = NULL;
2164         wacom_wac->pen_input = NULL;
2165         return error;
2166 }
2167
2168 /*
2169  * Not all devices report physical dimensions from HID.
2170  * Compute the default from hardcoded logical dimension
2171  * and resolution before driver overwrites them.
2172  */
2173 static void wacom_set_default_phy(struct wacom_features *features)
2174 {
2175         if (features->x_resolution) {
2176                 features->x_phy = (features->x_max * 100) /
2177                                         features->x_resolution;
2178                 features->y_phy = (features->y_max * 100) /
2179                                         features->y_resolution;
2180         }
2181 }
2182
2183 static void wacom_calculate_res(struct wacom_features *features)
2184 {
2185         /* set unit to "100th of a mm" for devices not reported by HID */
2186         if (!features->unit) {
2187                 features->unit = 0x11;
2188                 features->unitExpo = -3;
2189         }
2190
2191         features->x_resolution = wacom_calc_hid_res(features->x_max,
2192                                                     features->x_phy,
2193                                                     features->unit,
2194                                                     features->unitExpo);
2195         features->y_resolution = wacom_calc_hid_res(features->y_max,
2196                                                     features->y_phy,
2197                                                     features->unit,
2198                                                     features->unitExpo);
2199 }
2200
2201 void wacom_battery_work(struct work_struct *work)
2202 {
2203         struct wacom *wacom = container_of(work, struct wacom, battery_work);
2204
2205         if ((wacom->wacom_wac.features.quirks & WACOM_QUIRK_BATTERY) &&
2206              !wacom->battery.battery) {
2207                 wacom_initialize_battery(wacom);
2208         }
2209         else if (!(wacom->wacom_wac.features.quirks & WACOM_QUIRK_BATTERY) &&
2210                  wacom->battery.battery) {
2211                 wacom_destroy_battery(wacom);
2212         }
2213 }
2214
2215 static size_t wacom_compute_pktlen(struct hid_device *hdev)
2216 {
2217         struct hid_report_enum *report_enum;
2218         struct hid_report *report;
2219         size_t size = 0;
2220
2221         report_enum = hdev->report_enum + HID_INPUT_REPORT;
2222
2223         list_for_each_entry(report, &report_enum->report_list, list) {
2224                 size_t report_size = hid_report_len(report);
2225                 if (report_size > size)
2226                         size = report_size;
2227         }
2228
2229         return size;
2230 }
2231
2232 static void wacom_update_name(struct wacom *wacom, const char *suffix)
2233 {
2234         struct wacom_wac *wacom_wac = &wacom->wacom_wac;
2235         struct wacom_features *features = &wacom_wac->features;
2236         char name[WACOM_NAME_MAX - 20]; /* Leave some room for suffixes */
2237
2238         /* Generic devices name unspecified */
2239         if ((features->type == HID_GENERIC) && !strcmp("Wacom HID", features->name)) {
2240                 char *product_name = wacom->hdev->name;
2241
2242                 if (hid_is_usb(wacom->hdev)) {
2243                         struct usb_interface *intf = to_usb_interface(wacom->hdev->dev.parent);
2244                         struct usb_device *dev = interface_to_usbdev(intf);
2245                         product_name = dev->product;
2246                 }
2247
2248                 if (wacom->hdev->bus == BUS_I2C) {
2249                         snprintf(name, sizeof(name), "%s %X",
2250                                  features->name, wacom->hdev->product);
2251                 } else if (strstr(product_name, "Wacom") ||
2252                            strstr(product_name, "wacom") ||
2253                            strstr(product_name, "WACOM")) {
2254                         strlcpy(name, product_name, sizeof(name));
2255                 } else {
2256                         snprintf(name, sizeof(name), "Wacom %s", product_name);
2257                 }
2258
2259                 /* strip out excess whitespaces */
2260                 while (1) {
2261                         char *gap = strstr(name, "  ");
2262                         if (gap == NULL)
2263                                 break;
2264                         /* shift everything including the terminator */
2265                         memmove(gap, gap+1, strlen(gap));
2266                 }
2267
2268                 /* get rid of trailing whitespace */
2269                 if (name[strlen(name)-1] == ' ')
2270                         name[strlen(name)-1] = '\0';
2271         } else {
2272                 strlcpy(name, features->name, sizeof(name));
2273         }
2274
2275         snprintf(wacom_wac->name, sizeof(wacom_wac->name), "%s%s",
2276                  name, suffix);
2277
2278         /* Append the device type to the name */
2279         snprintf(wacom_wac->pen_name, sizeof(wacom_wac->pen_name),
2280                 "%s%s Pen", name, suffix);
2281         snprintf(wacom_wac->touch_name, sizeof(wacom_wac->touch_name),
2282                 "%s%s Finger", name, suffix);
2283         snprintf(wacom_wac->pad_name, sizeof(wacom_wac->pad_name),
2284                 "%s%s Pad", name, suffix);
2285 }
2286
2287 static void wacom_release_resources(struct wacom *wacom)
2288 {
2289         struct hid_device *hdev = wacom->hdev;
2290
2291         if (!wacom->resources)
2292                 return;
2293
2294         devres_release_group(&hdev->dev, wacom);
2295
2296         wacom->resources = false;
2297
2298         wacom->wacom_wac.pen_input = NULL;
2299         wacom->wacom_wac.touch_input = NULL;
2300         wacom->wacom_wac.pad_input = NULL;
2301 }
2302
2303 static void wacom_set_shared_values(struct wacom_wac *wacom_wac)
2304 {
2305         if (wacom_wac->features.device_type & WACOM_DEVICETYPE_TOUCH) {
2306                 wacom_wac->shared->type = wacom_wac->features.type;
2307                 wacom_wac->shared->touch_input = wacom_wac->touch_input;
2308         }
2309
2310         if (wacom_wac->has_mute_touch_switch) {
2311                 wacom_wac->shared->has_mute_touch_switch = true;
2312                 wacom_wac->shared->is_touch_on = true;
2313         }
2314
2315         if (wacom_wac->shared->has_mute_touch_switch &&
2316             wacom_wac->shared->touch_input) {
2317                 set_bit(EV_SW, wacom_wac->shared->touch_input->evbit);
2318                 input_set_capability(wacom_wac->shared->touch_input, EV_SW,
2319                                      SW_MUTE_DEVICE);
2320         }
2321 }
2322
2323 static int wacom_parse_and_register(struct wacom *wacom, bool wireless)
2324 {
2325         struct wacom_wac *wacom_wac = &wacom->wacom_wac;
2326         struct wacom_features *features = &wacom_wac->features;
2327         struct hid_device *hdev = wacom->hdev;
2328         int error;
2329         unsigned int connect_mask = HID_CONNECT_HIDRAW;
2330
2331         features->pktlen = wacom_compute_pktlen(hdev);
2332         if (features->pktlen > WACOM_PKGLEN_MAX)
2333                 return -EINVAL;
2334
2335         if (!devres_open_group(&hdev->dev, wacom, GFP_KERNEL))
2336                 return -ENOMEM;
2337
2338         wacom->resources = true;
2339
2340         error = wacom_allocate_inputs(wacom);
2341         if (error)
2342                 goto fail;
2343
2344         /*
2345          * Bamboo Pad has a generic hid handling for the Pen, and we switch it
2346          * into debug mode for the touch part.
2347          * We ignore the other interfaces.
2348          */
2349         if (features->type == BAMBOO_PAD) {
2350                 if (features->pktlen == WACOM_PKGLEN_PENABLED) {
2351                         features->type = HID_GENERIC;
2352                 } else if ((features->pktlen != WACOM_PKGLEN_BPAD_TOUCH) &&
2353                            (features->pktlen != WACOM_PKGLEN_BPAD_TOUCH_USB)) {
2354                         error = -ENODEV;
2355                         goto fail;
2356                 }
2357         }
2358
2359         /* set the default size in case we do not get them from hid */
2360         wacom_set_default_phy(features);
2361
2362         /* Retrieve the physical and logical size for touch devices */
2363         wacom_retrieve_hid_descriptor(hdev, features);
2364         wacom_setup_device_quirks(wacom);
2365
2366         if (features->device_type == WACOM_DEVICETYPE_NONE &&
2367             features->type != WIRELESS) {
2368                 error = features->type == HID_GENERIC ? -ENODEV : 0;
2369
2370                 dev_warn(&hdev->dev, "Unknown device_type for '%s'. %s.",
2371                          hdev->name,
2372                          error ? "Ignoring" : "Assuming pen");
2373
2374                 if (error)
2375                         goto fail;
2376
2377                 features->device_type |= WACOM_DEVICETYPE_PEN;
2378         }
2379
2380         wacom_calculate_res(features);
2381
2382         wacom_update_name(wacom, wireless ? " (WL)" : "");
2383
2384         /* pen only Bamboo neither support touch nor pad */
2385         if ((features->type == BAMBOO_PEN) &&
2386             ((features->device_type & WACOM_DEVICETYPE_TOUCH) ||
2387             (features->device_type & WACOM_DEVICETYPE_PAD))) {
2388                 error = -ENODEV;
2389                 goto fail;
2390         }
2391
2392         error = wacom_add_shared_data(hdev);
2393         if (error)
2394                 goto fail;
2395
2396         if (!(features->device_type & WACOM_DEVICETYPE_WL_MONITOR) &&
2397              (features->quirks & WACOM_QUIRK_BATTERY)) {
2398                 error = wacom_initialize_battery(wacom);
2399                 if (error)
2400                         goto fail;
2401         }
2402
2403         error = wacom_setup_inputs(wacom);
2404         if (error)
2405                 goto fail;
2406
2407         if (features->type == HID_GENERIC)
2408                 connect_mask |= HID_CONNECT_DRIVER;
2409
2410         /* Regular HID work starts now */
2411         error = hid_hw_start(hdev, connect_mask);
2412         if (error) {
2413                 hid_err(hdev, "hw start failed\n");
2414                 goto fail;
2415         }
2416
2417         error = wacom_register_inputs(wacom);
2418         if (error)
2419                 goto fail;
2420
2421         if (wacom->wacom_wac.features.device_type & WACOM_DEVICETYPE_PAD) {
2422                 error = wacom_initialize_leds(wacom);
2423                 if (error)
2424                         goto fail;
2425
2426                 error = wacom_initialize_remotes(wacom);
2427                 if (error)
2428                         goto fail;
2429         }
2430
2431         if (!wireless) {
2432                 /* Note that if query fails it is not a hard failure */
2433                 wacom_query_tablet_data(wacom);
2434         }
2435
2436         /* touch only Bamboo doesn't support pen */
2437         if ((features->type == BAMBOO_TOUCH) &&
2438             (features->device_type & WACOM_DEVICETYPE_PEN)) {
2439                 cancel_delayed_work_sync(&wacom->init_work);
2440                 _wacom_query_tablet_data(wacom);
2441                 error = -ENODEV;
2442                 goto fail_quirks;
2443         }
2444
2445         if (features->device_type & WACOM_DEVICETYPE_WL_MONITOR) {
2446                 error = hid_hw_open(hdev);
2447                 if (error) {
2448                         hid_err(hdev, "hw open failed\n");
2449                         goto fail_quirks;
2450                 }
2451         }
2452
2453         wacom_set_shared_values(wacom_wac);
2454         devres_close_group(&hdev->dev, wacom);
2455
2456         return 0;
2457
2458 fail_quirks:
2459         hid_hw_stop(hdev);
2460 fail:
2461         wacom_release_resources(wacom);
2462         return error;
2463 }
2464
2465 static void wacom_wireless_work(struct work_struct *work)
2466 {
2467         struct wacom *wacom = container_of(work, struct wacom, wireless_work);
2468         struct usb_device *usbdev = wacom->usbdev;
2469         struct wacom_wac *wacom_wac = &wacom->wacom_wac;
2470         struct hid_device *hdev1, *hdev2;
2471         struct wacom *wacom1, *wacom2;
2472         struct wacom_wac *wacom_wac1, *wacom_wac2;
2473         int error;
2474
2475         /*
2476          * Regardless if this is a disconnect or a new tablet,
2477          * remove any existing input and battery devices.
2478          */
2479
2480         wacom_destroy_battery(wacom);
2481
2482         if (!usbdev)
2483                 return;
2484
2485         /* Stylus interface */
2486         hdev1 = usb_get_intfdata(usbdev->config->interface[1]);
2487         wacom1 = hid_get_drvdata(hdev1);
2488         wacom_wac1 = &(wacom1->wacom_wac);
2489         wacom_release_resources(wacom1);
2490
2491         /* Touch interface */
2492         hdev2 = usb_get_intfdata(usbdev->config->interface[2]);
2493         wacom2 = hid_get_drvdata(hdev2);
2494         wacom_wac2 = &(wacom2->wacom_wac);
2495         wacom_release_resources(wacom2);
2496
2497         if (wacom_wac->pid == 0) {
2498                 hid_info(wacom->hdev, "wireless tablet disconnected\n");
2499         } else {
2500                 const struct hid_device_id *id = wacom_ids;
2501
2502                 hid_info(wacom->hdev, "wireless tablet connected with PID %x\n",
2503                          wacom_wac->pid);
2504
2505                 while (id->bus) {
2506                         if (id->vendor == USB_VENDOR_ID_WACOM &&
2507                             id->product == wacom_wac->pid)
2508                                 break;
2509                         id++;
2510                 }
2511
2512                 if (!id->bus) {
2513                         hid_info(wacom->hdev, "ignoring unknown PID.\n");
2514                         return;
2515                 }
2516
2517                 /* Stylus interface */
2518                 wacom_wac1->features =
2519                         *((struct wacom_features *)id->driver_data);
2520
2521                 wacom_wac1->pid = wacom_wac->pid;
2522                 hid_hw_stop(hdev1);
2523                 error = wacom_parse_and_register(wacom1, true);
2524                 if (error)
2525                         goto fail;
2526
2527                 /* Touch interface */
2528                 if (wacom_wac1->features.touch_max ||
2529                     (wacom_wac1->features.type >= INTUOSHT &&
2530                     wacom_wac1->features.type <= BAMBOO_PT)) {
2531                         wacom_wac2->features =
2532                                 *((struct wacom_features *)id->driver_data);
2533                         wacom_wac2->pid = wacom_wac->pid;
2534                         hid_hw_stop(hdev2);
2535                         error = wacom_parse_and_register(wacom2, true);
2536                         if (error)
2537                                 goto fail;
2538                 }
2539
2540                 strlcpy(wacom_wac->name, wacom_wac1->name,
2541                         sizeof(wacom_wac->name));
2542                 error = wacom_initialize_battery(wacom);
2543                 if (error)
2544                         goto fail;
2545         }
2546
2547         return;
2548
2549 fail:
2550         wacom_release_resources(wacom1);
2551         wacom_release_resources(wacom2);
2552         return;
2553 }
2554
2555 static void wacom_remote_destroy_battery(struct wacom *wacom, int index)
2556 {
2557         struct wacom_remote *remote = wacom->remote;
2558
2559         if (remote->remotes[index].battery.battery) {
2560                 devres_release_group(&wacom->hdev->dev,
2561                                      &remote->remotes[index].battery.bat_desc);
2562                 remote->remotes[index].battery.battery = NULL;
2563                 remote->remotes[index].active_time = 0;
2564         }
2565 }
2566
2567 static void wacom_remote_destroy_one(struct wacom *wacom, unsigned int index)
2568 {
2569         struct wacom_remote *remote = wacom->remote;
2570         u32 serial = remote->remotes[index].serial;
2571         int i;
2572         unsigned long flags;
2573
2574         for (i = 0; i < WACOM_MAX_REMOTES; i++) {
2575                 if (remote->remotes[i].serial == serial) {
2576
2577                         spin_lock_irqsave(&remote->remote_lock, flags);
2578                         remote->remotes[i].registered = false;
2579                         spin_unlock_irqrestore(&remote->remote_lock, flags);
2580
2581                         wacom_remote_destroy_battery(wacom, i);
2582
2583                         if (remote->remotes[i].group.name)
2584                                 devres_release_group(&wacom->hdev->dev,
2585                                                      &remote->remotes[i]);
2586
2587                         remote->remotes[i].serial = 0;
2588                         remote->remotes[i].group.name = NULL;
2589                         wacom->led.groups[i].select = WACOM_STATUS_UNKNOWN;
2590                 }
2591         }
2592 }
2593
2594 static int wacom_remote_create_one(struct wacom *wacom, u32 serial,
2595                                    unsigned int index)
2596 {
2597         struct wacom_remote *remote = wacom->remote;
2598         struct device *dev = &wacom->hdev->dev;
2599         int error, k;
2600
2601         /* A remote can pair more than once with an EKR,
2602          * check to make sure this serial isn't already paired.
2603          */
2604         for (k = 0; k < WACOM_MAX_REMOTES; k++) {
2605                 if (remote->remotes[k].serial == serial)
2606                         break;
2607         }
2608
2609         if (k < WACOM_MAX_REMOTES) {
2610                 remote->remotes[index].serial = serial;
2611                 return 0;
2612         }
2613
2614         if (!devres_open_group(dev, &remote->remotes[index], GFP_KERNEL))
2615                 return -ENOMEM;
2616
2617         error = wacom_remote_create_attr_group(wacom, serial, index);
2618         if (error)
2619                 goto fail;
2620
2621         remote->remotes[index].input = wacom_allocate_input(wacom);
2622         if (!remote->remotes[index].input) {
2623                 error = -ENOMEM;
2624                 goto fail;
2625         }
2626         remote->remotes[index].input->uniq = remote->remotes[index].group.name;
2627         remote->remotes[index].input->name = wacom->wacom_wac.pad_name;
2628
2629         if (!remote->remotes[index].input->name) {
2630                 error = -EINVAL;
2631                 goto fail;
2632         }
2633
2634         error = wacom_setup_pad_input_capabilities(remote->remotes[index].input,
2635                                                    &wacom->wacom_wac);
2636         if (error)
2637                 goto fail;
2638
2639         remote->remotes[index].serial = serial;
2640
2641         error = input_register_device(remote->remotes[index].input);
2642         if (error)
2643                 goto fail;
2644
2645         error = wacom_led_groups_alloc_and_register_one(
2646                                         &remote->remotes[index].input->dev,
2647                                         wacom, index, 3, true);
2648         if (error)
2649                 goto fail;
2650
2651         remote->remotes[index].registered = true;
2652
2653         devres_close_group(dev, &remote->remotes[index]);
2654         return 0;
2655
2656 fail:
2657         devres_release_group(dev, &remote->remotes[index]);
2658         remote->remotes[index].serial = 0;
2659         return error;
2660 }
2661
2662 static int wacom_remote_attach_battery(struct wacom *wacom, int index)
2663 {
2664         struct wacom_remote *remote = wacom->remote;
2665         int error;
2666
2667         if (!remote->remotes[index].registered)
2668                 return 0;
2669
2670         if (remote->remotes[index].battery.battery)
2671                 return 0;
2672
2673         if (!remote->remotes[index].active_time)
2674                 return 0;
2675
2676         if (wacom->led.groups[index].select == WACOM_STATUS_UNKNOWN)
2677                 return 0;
2678
2679         error = __wacom_initialize_battery(wacom,
2680                                         &wacom->remote->remotes[index].battery);
2681         if (error)
2682                 return error;
2683
2684         return 0;
2685 }
2686
2687 static void wacom_remote_work(struct work_struct *work)
2688 {
2689         struct wacom *wacom = container_of(work, struct wacom, remote_work);
2690         struct wacom_remote *remote = wacom->remote;
2691         ktime_t kt = ktime_get();
2692         struct wacom_remote_data data;
2693         unsigned long flags;
2694         unsigned int count;
2695         u32 serial;
2696         int i;
2697
2698         spin_lock_irqsave(&remote->remote_lock, flags);
2699
2700         count = kfifo_out(&remote->remote_fifo, &data, sizeof(data));
2701
2702         if (count != sizeof(data)) {
2703                 hid_err(wacom->hdev,
2704                         "workitem triggered without status available\n");
2705                 spin_unlock_irqrestore(&remote->remote_lock, flags);
2706                 return;
2707         }
2708
2709         if (!kfifo_is_empty(&remote->remote_fifo))
2710                 wacom_schedule_work(&wacom->wacom_wac, WACOM_WORKER_REMOTE);
2711
2712         spin_unlock_irqrestore(&remote->remote_lock, flags);
2713
2714         for (i = 0; i < WACOM_MAX_REMOTES; i++) {
2715                 serial = data.remote[i].serial;
2716                 if (data.remote[i].connected) {
2717
2718                         if (kt - remote->remotes[i].active_time > WACOM_REMOTE_BATTERY_TIMEOUT
2719                             && remote->remotes[i].active_time != 0)
2720                                 wacom_remote_destroy_battery(wacom, i);
2721
2722                         if (remote->remotes[i].serial == serial) {
2723                                 wacom_remote_attach_battery(wacom, i);
2724                                 continue;
2725                         }
2726
2727                         if (remote->remotes[i].serial)
2728                                 wacom_remote_destroy_one(wacom, i);
2729
2730                         wacom_remote_create_one(wacom, serial, i);
2731
2732                 } else if (remote->remotes[i].serial) {
2733                         wacom_remote_destroy_one(wacom, i);
2734                 }
2735         }
2736 }
2737
2738 static void wacom_mode_change_work(struct work_struct *work)
2739 {
2740         struct wacom *wacom = container_of(work, struct wacom, mode_change_work);
2741         struct wacom_shared *shared = wacom->wacom_wac.shared;
2742         struct wacom *wacom1 = NULL;
2743         struct wacom *wacom2 = NULL;
2744         bool is_direct = wacom->wacom_wac.is_direct_mode;
2745         int error = 0;
2746
2747         if (shared->pen) {
2748                 wacom1 = hid_get_drvdata(shared->pen);
2749                 wacom_release_resources(wacom1);
2750                 hid_hw_stop(wacom1->hdev);
2751                 wacom1->wacom_wac.has_mode_change = true;
2752                 wacom1->wacom_wac.is_direct_mode = is_direct;
2753         }
2754
2755         if (shared->touch) {
2756                 wacom2 = hid_get_drvdata(shared->touch);
2757                 wacom_release_resources(wacom2);
2758                 hid_hw_stop(wacom2->hdev);
2759                 wacom2->wacom_wac.has_mode_change = true;
2760                 wacom2->wacom_wac.is_direct_mode = is_direct;
2761         }
2762
2763         if (wacom1) {
2764                 error = wacom_parse_and_register(wacom1, false);
2765                 if (error)
2766                         return;
2767         }
2768
2769         if (wacom2) {
2770                 error = wacom_parse_and_register(wacom2, false);
2771                 if (error)
2772                         return;
2773         }
2774
2775         return;
2776 }
2777
2778 static int wacom_probe(struct hid_device *hdev,
2779                 const struct hid_device_id *id)
2780 {
2781         struct wacom *wacom;
2782         struct wacom_wac *wacom_wac;
2783         struct wacom_features *features;
2784         int error;
2785
2786         if (!id->driver_data)
2787                 return -EINVAL;
2788
2789         hdev->quirks |= HID_QUIRK_NO_INIT_REPORTS;
2790
2791         /* hid-core sets this quirk for the boot interface */
2792         hdev->quirks &= ~HID_QUIRK_NOGET;
2793
2794         wacom = devm_kzalloc(&hdev->dev, sizeof(struct wacom), GFP_KERNEL);
2795         if (!wacom)
2796                 return -ENOMEM;
2797
2798         hid_set_drvdata(hdev, wacom);
2799         wacom->hdev = hdev;
2800
2801         wacom_wac = &wacom->wacom_wac;
2802         wacom_wac->features = *((struct wacom_features *)id->driver_data);
2803         features = &wacom_wac->features;
2804
2805         if (features->check_for_hid_type && features->hid_type != hdev->type)
2806                 return -ENODEV;
2807
2808         error = wacom_devm_kfifo_alloc(wacom);
2809         if (error)
2810                 return error;
2811
2812         wacom_wac->hid_data.inputmode = -1;
2813         wacom_wac->mode_report = -1;
2814
2815         if (hid_is_usb(hdev)) {
2816                 struct usb_interface *intf = to_usb_interface(hdev->dev.parent);
2817                 struct usb_device *dev = interface_to_usbdev(intf);
2818
2819                 wacom->usbdev = dev;
2820                 wacom->intf = intf;
2821         }
2822
2823         mutex_init(&wacom->lock);
2824         INIT_DELAYED_WORK(&wacom->init_work, wacom_init_work);
2825         INIT_WORK(&wacom->wireless_work, wacom_wireless_work);
2826         INIT_WORK(&wacom->battery_work, wacom_battery_work);
2827         INIT_WORK(&wacom->remote_work, wacom_remote_work);
2828         INIT_WORK(&wacom->mode_change_work, wacom_mode_change_work);
2829         timer_setup(&wacom->idleprox_timer, &wacom_idleprox_timeout, TIMER_DEFERRABLE);
2830
2831         /* ask for the report descriptor to be loaded by HID */
2832         error = hid_parse(hdev);
2833         if (error) {
2834                 hid_err(hdev, "parse failed\n");
2835                 return error;
2836         }
2837
2838         if (features->type == BOOTLOADER) {
2839                 hid_warn(hdev, "Using device in hidraw-only mode");
2840                 return hid_hw_start(hdev, HID_CONNECT_HIDRAW);
2841         }
2842
2843         error = wacom_parse_and_register(wacom, false);
2844         if (error)
2845                 return error;
2846
2847         if (hdev->bus == BUS_BLUETOOTH) {
2848                 error = device_create_file(&hdev->dev, &dev_attr_speed);
2849                 if (error)
2850                         hid_warn(hdev,
2851                                  "can't create sysfs speed attribute err: %d\n",
2852                                  error);
2853         }
2854
2855         return 0;
2856 }
2857
2858 static void wacom_remove(struct hid_device *hdev)
2859 {
2860         struct wacom *wacom = hid_get_drvdata(hdev);
2861         struct wacom_wac *wacom_wac = &wacom->wacom_wac;
2862         struct wacom_features *features = &wacom_wac->features;
2863
2864         if (features->device_type & WACOM_DEVICETYPE_WL_MONITOR)
2865                 hid_hw_close(hdev);
2866
2867         hid_hw_stop(hdev);
2868
2869         cancel_delayed_work_sync(&wacom->init_work);
2870         cancel_work_sync(&wacom->wireless_work);
2871         cancel_work_sync(&wacom->battery_work);
2872         cancel_work_sync(&wacom->remote_work);
2873         cancel_work_sync(&wacom->mode_change_work);
2874         del_timer_sync(&wacom->idleprox_timer);
2875         if (hdev->bus == BUS_BLUETOOTH)
2876                 device_remove_file(&hdev->dev, &dev_attr_speed);
2877
2878         /* make sure we don't trigger the LEDs */
2879         wacom_led_groups_release(wacom);
2880
2881         if (wacom->wacom_wac.features.type != REMOTE)
2882                 wacom_release_resources(wacom);
2883 }
2884
2885 #ifdef CONFIG_PM
2886 static int wacom_resume(struct hid_device *hdev)
2887 {
2888         struct wacom *wacom = hid_get_drvdata(hdev);
2889
2890         mutex_lock(&wacom->lock);
2891
2892         /* switch to wacom mode first */
2893         _wacom_query_tablet_data(wacom);
2894         wacom_led_control(wacom);
2895
2896         mutex_unlock(&wacom->lock);
2897
2898         return 0;
2899 }
2900
2901 static int wacom_reset_resume(struct hid_device *hdev)
2902 {
2903         return wacom_resume(hdev);
2904 }
2905 #endif /* CONFIG_PM */
2906
2907 static struct hid_driver wacom_driver = {
2908         .name =         "wacom",
2909         .id_table =     wacom_ids,
2910         .probe =        wacom_probe,
2911         .remove =       wacom_remove,
2912         .report =       wacom_wac_report,
2913 #ifdef CONFIG_PM
2914         .resume =       wacom_resume,
2915         .reset_resume = wacom_reset_resume,
2916 #endif
2917         .raw_event =    wacom_raw_event,
2918 };
2919 module_hid_driver(wacom_driver);
2920
2921 MODULE_VERSION(DRIVER_VERSION);
2922 MODULE_AUTHOR(DRIVER_AUTHOR);
2923 MODULE_DESCRIPTION(DRIVER_DESC);
2924 MODULE_LICENSE("GPL");