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