drivers/hid/wacom_sys.c

   1 /*
   2  * drivers/input/tablet/wacom_sys.c
   3  *
   4  *  USB Wacom tablet support - system specific code
   5  */
   6
   7 /*
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License as published by
  10  * the Free Software Foundation; either version 2 of the License, or
  11  * (at your option) any later version.
  12  */
  13
  14 #include "wacom_wac.h"
  15 #include "wacom.h"
  16 #include <linux/input/mt.h>
  17
  18 #define WAC_MSG_RETRIES         5
  19
  20 #define WAC_CMD_WL_LED_CONTROL  0x03
  21 #define WAC_CMD_LED_CONTROL     0x20
  22 #define WAC_CMD_ICON_START      0x21
  23 #define WAC_CMD_ICON_XFER       0x23
  24 #define WAC_CMD_ICON_BT_XFER    0x26
  25 #define WAC_CMD_RETRIES         10
  26 #define WAC_CMD_DELETE_PAIRING  0x20
  27 #define WAC_CMD_UNPAIR_ALL      0xFF
  28
  29 #define DEV_ATTR_RW_PERM (S_IRUGO | S_IWUSR | S_IWGRP)
  30 #define DEV_ATTR_WO_PERM (S_IWUSR | S_IWGRP)
  31 #define DEV_ATTR_RO_PERM (S_IRUSR | S_IRGRP)
  32
  33 static int wacom_get_report(struct hid_device *hdev, u8 type, u8 *buf,
  34                             size_t size, unsigned int retries)
  35 {
  36         int retval;
  37
  38         do {
  39                 retval = hid_hw_raw_request(hdev, buf[0], buf, size, type,
  40                                 HID_REQ_GET_REPORT);
  41         } while ((retval == -ETIMEDOUT || retval == -EAGAIN) && --retries);
  42
  43         if (retval < 0)
  44                 hid_err(hdev, "wacom_get_report: ran out of retries "
  45                         "(last error = %d)\n", retval);
  46
  47         return retval;
  48 }
  49
  50 static int wacom_set_report(struct hid_device *hdev, u8 type, u8 *buf,
  51                             size_t size, unsigned int retries)
  52 {
  53         int retval;
  54
  55         do {
  56                 retval = hid_hw_raw_request(hdev, buf[0], buf, size, type,
  57                                 HID_REQ_SET_REPORT);
  58         } while ((retval == -ETIMEDOUT || retval == -EAGAIN) && --retries);
  59
  60         if (retval < 0)
  61                 hid_err(hdev, "wacom_set_report: ran out of retries "
  62                         "(last error = %d)\n", retval);
  63
  64         return retval;
  65 }
  66
  67 static int wacom_raw_event(struct hid_device *hdev, struct hid_report *report,
  68                 u8 *raw_data, int size)
  69 {
  70         struct wacom *wacom = hid_get_drvdata(hdev);
  71
  72         if (size > WACOM_PKGLEN_MAX)
  73                 return 1;
  74
  75         memcpy(wacom->wacom_wac.data, raw_data, size);
  76
  77         wacom_wac_irq(&wacom->wacom_wac, size);
  78
  79         return 0;
  80 }
  81
  82 static int wacom_open(struct input_dev *dev)
  83 {
  84         struct wacom *wacom = input_get_drvdata(dev);
  85
  86         return hid_hw_open(wacom->hdev);
  87 }
  88
  89 static void wacom_close(struct input_dev *dev)
  90 {
  91         struct wacom *wacom = input_get_drvdata(dev);
  92
  93         /*
  94          * wacom->hdev should never be null, but surprisingly, I had the case
  95          * once while unplugging the Wacom Wireless Receiver.
  96          */
  97         if (wacom->hdev)
  98                 hid_hw_close(wacom->hdev);
  99 }
 100
 101 /*
 102  * Calculate the resolution of the X or Y axis using hidinput_calc_abs_res.
 103  */
 104 static int wacom_calc_hid_res(int logical_extents, int physical_extents,
 105                                unsigned unit, int exponent)
 106 {
 107         struct hid_field field = {
 108                 .logical_maximum = logical_extents,
 109                 .physical_maximum = physical_extents,
 110                 .unit = unit,
 111                 .unit_exponent = exponent,
 112         };
 113
 114         return hidinput_calc_abs_res(&field, ABS_X);
 115 }
 116
 117 static void wacom_feature_mapping(struct hid_device *hdev,
 118                 struct hid_field *field, struct hid_usage *usage)
 119 {
 120         struct wacom *wacom = hid_get_drvdata(hdev);
 121         struct wacom_features *features = &wacom->wacom_wac.features;
 122         struct hid_data *hid_data = &wacom->wacom_wac.hid_data;
 123         u8 *data;
 124         int ret;
 125         int n;
 126
 127         switch (usage->hid) {
 128         case HID_DG_CONTACTMAX:
 129                 /* leave touch_max as is if predefined */
 130                 if (!features->touch_max) {
 131                         /* read manually */
 132                         data = kzalloc(2, GFP_KERNEL);
 133                         if (!data)
 134                                 break;
 135                         data[0] = field->report->id;
 136                         ret = wacom_get_report(hdev, HID_FEATURE_REPORT,
 137                                                 data, 2, WAC_CMD_RETRIES);
 138                         if (ret == 2) {
 139                                 features->touch_max = data[1];
 140                         } else {
 141                                 features->touch_max = 16;
 142                                 hid_warn(hdev, "wacom_feature_mapping: "
 143                                          "could not get HID_DG_CONTACTMAX, "
 144                                          "defaulting to %d\n",
 145                                           features->touch_max);
 146                         }
 147                         kfree(data);
 148                 }
 149                 break;
 150         case HID_DG_INPUTMODE:
 151                 /* Ignore if value index is out of bounds. */
 152                 if (usage->usage_index >= field->report_count) {
 153                         dev_err(&hdev->dev, "HID_DG_INPUTMODE out of range\n");
 154                         break;
 155                 }
 156
 157                 hid_data->inputmode = field->report->id;
 158                 hid_data->inputmode_index = usage->usage_index;
 159                 break;
 160
 161         case HID_UP_DIGITIZER:
 162                 if (field->report->id == 0x0B &&
 163                     (field->application == WACOM_HID_G9_PEN ||
 164                      field->application == WACOM_HID_G11_PEN)) {
 165                         wacom->wacom_wac.mode_report = field->report->id;
 166                         wacom->wacom_wac.mode_value = 0;
 167                 }
 168                 break;
 169
 170         case WACOM_HID_WD_DATAMODE:
 171                 wacom->wacom_wac.mode_report = field->report->id;
 172                 wacom->wacom_wac.mode_value = 2;
 173                 break;
 174
 175         case WACOM_HID_UP_G9:
 176         case WACOM_HID_UP_G11:
 177                 if (field->report->id == 0x03 &&
 178                     (field->application == WACOM_HID_G9_TOUCHSCREEN ||
 179                      field->application == WACOM_HID_G11_TOUCHSCREEN)) {
 180                         wacom->wacom_wac.mode_report = field->report->id;
 181                         wacom->wacom_wac.mode_value = 0;
 182                 }
 183                 break;
 184         case WACOM_HID_WD_OFFSETLEFT:
 185         case WACOM_HID_WD_OFFSETTOP:
 186         case WACOM_HID_WD_OFFSETRIGHT:
 187         case WACOM_HID_WD_OFFSETBOTTOM:
 188                 /* read manually */
 189                 n = hid_report_len(field->report);
 190                 data = hid_alloc_report_buf(field->report, GFP_KERNEL);
 191                 if (!data)
 192                         break;
 193                 data[0] = field->report->id;
 194                 ret = wacom_get_report(hdev, HID_FEATURE_REPORT,
 195                                         data, n, WAC_CMD_RETRIES);
 196                 if (ret == n) {
 197                         ret = hid_report_raw_event(hdev, HID_FEATURE_REPORT,
 198                                                    data, n, 0);
 199                 } else {
 200                         hid_warn(hdev, "%s: could not retrieve sensor offsets\n",
 201                                  __func__);
 202                 }
 203                 kfree(data);
 204                 break;
 205         }
 206 }
 207
 208 /*
 209  * Interface Descriptor of wacom devices can be incomplete and
 210  * inconsistent so wacom_features table is used to store stylus
 211  * device's packet lengths, various maximum values, and tablet
 212  * resolution based on product ID's.
 213  *
 214  * For devices that contain 2 interfaces, wacom_features table is
 215  * inaccurate for the touch interface.  Since the Interface Descriptor
 216  * for touch interfaces has pretty complete data, this function exists
 217  * to query tablet for this missing information instead of hard coding in
 218  * an additional table.
 219  *
 220  * A typical Interface Descriptor for a stylus will contain a
 221  * boot mouse application collection that is not of interest and this
 222  * function will ignore it.
 223  *
 224  * It also contains a digitizer application collection that also is not
 225  * of interest since any information it contains would be duplicate
 226  * of what is in wacom_features. Usually it defines a report of an array
 227  * of bytes that could be used as max length of the stylus packet returned.
 228  * If it happens to define a Digitizer-Stylus Physical Collection then
 229  * the X and Y logical values contain valid data but it is ignored.
 230  *
 231  * A typical Interface Descriptor for a touch interface will contain a
 232  * Digitizer-Finger Physical Collection which will define both logical
 233  * X/Y maximum as well as the physical size of tablet. Since touch
 234  * interfaces haven't supported pressure or distance, this is enough
 235  * information to override invalid values in the wacom_features table.
 236  *
 237  * Intuos5 touch interface and 3rd gen Bamboo Touch do not contain useful
 238  * data. We deal with them after returning from this function.
 239  */
 240 static void wacom_usage_mapping(struct hid_device *hdev,
 241                 struct hid_field *field, struct hid_usage *usage)
 242 {
 243         struct wacom *wacom = hid_get_drvdata(hdev);
 244         struct wacom_features *features = &wacom->wacom_wac.features;
 245         bool finger = WACOM_FINGER_FIELD(field);
 246         bool pen = WACOM_PEN_FIELD(field);
 247
 248         /*
 249         * Requiring Stylus Usage will ignore boot mouse
 250         * X/Y values and some cases of invalid Digitizer X/Y
 251         * values commonly reported.
 252         */
 253         if (pen)
 254                 features->device_type |= WACOM_DEVICETYPE_PEN;
 255         else if (finger)
 256                 features->device_type |= WACOM_DEVICETYPE_TOUCH;
 257         else
 258                 return;
 259
 260         /*
 261          * Bamboo models do not support HID_DG_CONTACTMAX.
 262          * And, Bamboo Pen only descriptor contains touch.
 263          */
 264         if (features->type > BAMBOO_PT) {
 265                 /* ISDv4 touch devices at least supports one touch point */
 266                 if (finger && !features->touch_max)
 267                         features->touch_max = 1;
 268         }
 269
 270         /*
 271          * ISDv4 devices which predate HID's adoption of the
 272          * HID_DG_BARELSWITCH2 usage use 0x000D0000 in its
 273          * position instead. We can accurately detect if a
 274          * usage with that value should be HID_DG_BARRELSWITCH2
 275          * based on the surrounding usages, which have remained
 276          * constant across generations.
 277          */
 278         if (features->type == HID_GENERIC &&
 279             usage->hid == 0x000D0000 &&
 280             field->application == HID_DG_PEN &&
 281             field->physical == HID_DG_STYLUS) {
 282                 int i = usage->usage_index;
 283
 284                 if (i-4 >= 0 && i+1 < field->maxusage &&
 285                     field->usage[i-4].hid == HID_DG_TIPSWITCH &&
 286                     field->usage[i-3].hid == HID_DG_BARRELSWITCH &&
 287                     field->usage[i-2].hid == HID_DG_ERASER &&
 288                     field->usage[i-1].hid == HID_DG_INVERT &&
 289                     field->usage[i+1].hid == HID_DG_INRANGE) {
 290                         usage->hid = HID_DG_BARRELSWITCH2;
 291                 }
 292         }
 293
 294         switch (usage->hid) {
 295         case HID_GD_X:
 296                 features->x_max = field->logical_maximum;
 297                 if (finger) {
 298                         features->x_phy = field->physical_maximum;
 299                         if ((features->type != BAMBOO_PT) &&
 300                             (features->type != BAMBOO_TOUCH)) {
 301                                 features->unit = field->unit;
 302                                 features->unitExpo = field->unit_exponent;
 303                         }
 304                 }
 305                 break;
 306         case HID_GD_Y:
 307                 features->y_max = field->logical_maximum;
 308                 if (finger) {
 309                         features->y_phy = field->physical_maximum;
 310                         if ((features->type != BAMBOO_PT) &&
 311                             (features->type != BAMBOO_TOUCH)) {
 312                                 features->unit = field->unit;
 313                                 features->unitExpo = field->unit_exponent;
 314                         }
 315                 }
 316                 break;
 317         case HID_DG_TIPPRESSURE:
 318                 if (pen)
 319                         features->pressure_max = field->logical_maximum;
 320                 break;
 321         }
 322
 323         if (features->type == HID_GENERIC)
 324                 wacom_wac_usage_mapping(hdev, field, usage);
 325 }
 326
 327 static void wacom_post_parse_hid(struct hid_device *hdev,
 328                                  struct wacom_features *features)
 329 {
 330         struct wacom *wacom = hid_get_drvdata(hdev);
 331         struct wacom_wac *wacom_wac = &wacom->wacom_wac;
 332
 333         if (features->type == HID_GENERIC) {
 334                 /* Any last-minute generic device setup */
 335                 if (features->touch_max > 1) {
 336                         input_mt_init_slots(wacom_wac->touch_input, wacom_wac->features.touch_max,
 337                                     INPUT_MT_DIRECT);
 338                 }
 339         }
 340 }
 341
 342 static void wacom_parse_hid(struct hid_device *hdev,
 343                            struct wacom_features *features)
 344 {
 345         struct hid_report_enum *rep_enum;
 346         struct hid_report *hreport;
 347         int i, j;
 348
 349         /* check features first */
 350         rep_enum = &hdev->report_enum[HID_FEATURE_REPORT];
 351         list_for_each_entry(hreport, &rep_enum->report_list, list) {
 352                 for (i = 0; i < hreport->maxfield; i++) {
 353                         /* Ignore if report count is out of bounds. */
 354                         if (hreport->field[i]->report_count < 1)
 355                                 continue;
 356
 357                         for (j = 0; j < hreport->field[i]->maxusage; j++) {
 358                                 wacom_feature_mapping(hdev, hreport->field[i],
 359                                                 hreport->field[i]->usage + j);
 360                         }
 361                 }
 362         }
 363
 364         /* now check the input usages */
 365         rep_enum = &hdev->report_enum[HID_INPUT_REPORT];
 366         list_for_each_entry(hreport, &rep_enum->report_list, list) {
 367
 368                 if (!hreport->maxfield)
 369                         continue;
 370
 371                 for (i = 0; i < hreport->maxfield; i++)
 372                         for (j = 0; j < hreport->field[i]->maxusage; j++)
 373                                 wacom_usage_mapping(hdev, hreport->field[i],
 374                                                 hreport->field[i]->usage + j);
 375         }
 376
 377         wacom_post_parse_hid(hdev, features);
 378 }
 379
 380 static int wacom_hid_set_device_mode(struct hid_device *hdev)
 381 {
 382         struct wacom *wacom = hid_get_drvdata(hdev);
 383         struct hid_data *hid_data = &wacom->wacom_wac.hid_data;
 384         struct hid_report *r;
 385         struct hid_report_enum *re;
 386
 387         if (hid_data->inputmode < 0)
 388                 return 0;
 389
 390         re = &(hdev->report_enum[HID_FEATURE_REPORT]);
 391         r = re->report_id_hash[hid_data->inputmode];
 392         if (r) {
 393                 r->field[0]->value[hid_data->inputmode_index] = 2;
 394                 hid_hw_request(hdev, r, HID_REQ_SET_REPORT);
 395         }
 396         return 0;
 397 }
 398
 399 static int wacom_set_device_mode(struct hid_device *hdev,
 400                                  struct wacom_wac *wacom_wac)
 401 {
 402         u8 *rep_data;
 403         struct hid_report *r;
 404         struct hid_report_enum *re;
 405         int length;
 406         int error = -ENOMEM, limit = 0;
 407
 408         if (wacom_wac->mode_report < 0)
 409                 return 0;
 410
 411         re = &(hdev->report_enum[HID_FEATURE_REPORT]);
 412         r = re->report_id_hash[wacom_wac->mode_report];
 413         if (!r)
 414                 return -EINVAL;
 415
 416         rep_data = hid_alloc_report_buf(r, GFP_KERNEL);
 417         if (!rep_data)
 418                 return -ENOMEM;
 419
 420         length = hid_report_len(r);
 421
 422         do {
 423                 rep_data[0] = wacom_wac->mode_report;
 424                 rep_data[1] = wacom_wac->mode_value;
 425
 426                 error = wacom_set_report(hdev, HID_FEATURE_REPORT, rep_data,
 427                                          length, 1);
 428                 if (error >= 0)
 429                         error = wacom_get_report(hdev, HID_FEATURE_REPORT,
 430                                                  rep_data, length, 1);
 431         } while (error >= 0 &&
 432                  rep_data[1] != wacom_wac->mode_report &&
 433                  limit++ < WAC_MSG_RETRIES);
 434
 435         kfree(rep_data);
 436
 437         return error < 0 ? error : 0;
 438 }
 439
 440 static int wacom_bt_query_tablet_data(struct hid_device *hdev, u8 speed,
 441                 struct wacom_features *features)
 442 {
 443         struct wacom *wacom = hid_get_drvdata(hdev);
 444         int ret;
 445         u8 rep_data[2];
 446
 447         switch (features->type) {
 448         case GRAPHIRE_BT:
 449                 rep_data[0] = 0x03;
 450                 rep_data[1] = 0x00;
 451                 ret = wacom_set_report(hdev, HID_FEATURE_REPORT, rep_data, 2,
 452                                         3);
 453
 454                 if (ret >= 0) {
 455                         rep_data[0] = speed == 0 ? 0x05 : 0x06;
 456                         rep_data[1] = 0x00;
 457
 458                         ret = wacom_set_report(hdev, HID_FEATURE_REPORT,
 459                                                 rep_data, 2, 3);
 460
 461                         if (ret >= 0) {
 462                                 wacom->wacom_wac.bt_high_speed = speed;
 463                                 return 0;
 464                         }
 465                 }
 466
 467                 /*
 468                  * Note that if the raw queries fail, it's not a hard failure
 469                  * and it is safe to continue
 470                  */
 471                 hid_warn(hdev, "failed to poke device, command %d, err %d\n",
 472                          rep_data[0], ret);
 473                 break;
 474         case INTUOS4WL:
 475                 if (speed == 1)
 476                         wacom->wacom_wac.bt_features &= ~0x20;
 477                 else
 478                         wacom->wacom_wac.bt_features |= 0x20;
 479
 480                 rep_data[0] = 0x03;
 481                 rep_data[1] = wacom->wacom_wac.bt_features;
 482
 483                 ret = wacom_set_report(hdev, HID_FEATURE_REPORT, rep_data, 2,
 484                                         1);
 485                 if (ret >= 0)
 486                         wacom->wacom_wac.bt_high_speed = speed;
 487                 break;
 488         }
 489
 490         return 0;
 491 }
 492
 493 /*
 494  * Switch the tablet into its most-capable mode. Wacom tablets are
 495  * typically configured to power-up in a mode which sends mouse-like
 496  * reports to the OS. To get absolute position, pressure data, etc.
 497  * from the tablet, it is necessary to switch the tablet out of this
 498  * mode and into one which sends the full range of tablet data.
 499  */
 500 static int wacom_query_tablet_data(struct hid_device *hdev,
 501                 struct wacom_features *features)
 502 {
 503         struct wacom *wacom = hid_get_drvdata(hdev);
 504         struct wacom_wac *wacom_wac = &wacom->wacom_wac;
 505
 506         if (hdev->bus == BUS_BLUETOOTH)
 507                 return wacom_bt_query_tablet_data(hdev, 1, features);
 508
 509         if (features->type != HID_GENERIC) {
 510                 if (features->device_type & WACOM_DEVICETYPE_TOUCH) {
 511                         if (features->type > TABLETPC) {
 512                                 /* MT Tablet PC touch */
 513                                 wacom_wac->mode_report = 3;
 514                                 wacom_wac->mode_value = 4;
 515                         } else if (features->type == WACOM_24HDT) {
 516                                 wacom_wac->mode_report = 18;
 517                                 wacom_wac->mode_value = 2;
 518                         } else if (features->type == WACOM_27QHDT) {
 519                                 wacom_wac->mode_report = 131;
 520                                 wacom_wac->mode_value = 2;
 521                         } else if (features->type == BAMBOO_PAD) {
 522                                 wacom_wac->mode_report = 2;
 523                                 wacom_wac->mode_value = 2;
 524                         }
 525                 } else if (features->device_type & WACOM_DEVICETYPE_PEN) {
 526                         if (features->type <= BAMBOO_PT) {
 527                                 wacom_wac->mode_report = 2;
 528                                 wacom_wac->mode_value = 2;
 529                         }
 530                 }
 531         }
 532
 533         wacom_set_device_mode(hdev, wacom_wac);
 534
 535         if (features->type == HID_GENERIC)
 536                 return wacom_hid_set_device_mode(hdev);
 537
 538         return 0;
 539 }
 540
 541 static void wacom_retrieve_hid_descriptor(struct hid_device *hdev,
 542                                          struct wacom_features *features)
 543 {
 544         struct wacom *wacom = hid_get_drvdata(hdev);
 545         struct usb_interface *intf = wacom->intf;
 546
 547         /* default features */
 548         features->x_fuzz = 4;
 549         features->y_fuzz = 4;
 550         features->pressure_fuzz = 0;
 551         features->distance_fuzz = 1;
 552         features->tilt_fuzz = 1;
 553
 554         /*
 555          * The wireless device HID is basic and layout conflicts with
 556          * other tablets (monitor and touch interface can look like pen).
 557          * Skip the query for this type and modify defaults based on
 558          * interface number.
 559          */
 560         if (features->type == WIRELESS) {
 561                 if (intf->cur_altsetting->desc.bInterfaceNumber == 0)
 562                         features->device_type = WACOM_DEVICETYPE_WL_MONITOR;
 563                 else
 564                         features->device_type = WACOM_DEVICETYPE_NONE;
 565                 return;
 566         }
 567
 568         wacom_parse_hid(hdev, features);
 569 }
 570
 571 struct wacom_hdev_data {
 572         struct list_head list;
 573         struct kref kref;
 574         struct hid_device *dev;
 575         struct wacom_shared shared;
 576 };
 577
 578 static LIST_HEAD(wacom_udev_list);
 579 static DEFINE_MUTEX(wacom_udev_list_lock);
 580
 581 static bool compare_device_paths(struct hid_device *hdev_a,
 582                 struct hid_device *hdev_b, char separator)
 583 {
 584         int n1 = strrchr(hdev_a->phys, separator) - hdev_a->phys;
 585         int n2 = strrchr(hdev_b->phys, separator) - hdev_b->phys;
 586
 587         if (n1 != n2 || n1 <= 0 || n2 <= 0)
 588                 return false;
 589
 590         return !strncmp(hdev_a->phys, hdev_b->phys, n1);
 591 }
 592
 593 static bool wacom_are_sibling(struct hid_device *hdev,
 594                 struct hid_device *sibling)
 595 {
 596         struct wacom *wacom = hid_get_drvdata(hdev);
 597         struct wacom_features *features = &wacom->wacom_wac.features;
 598         struct wacom *sibling_wacom = hid_get_drvdata(sibling);
 599         struct wacom_features *sibling_features = &sibling_wacom->wacom_wac.features;
 600         __u32 oVid = features->oVid ? features->oVid : hdev->vendor;
 601         __u32 oPid = features->oPid ? features->oPid : hdev->product;
 602
 603         /* The defined oVid/oPid must match that of the sibling */
 604         if (features->oVid != HID_ANY_ID && sibling->vendor != oVid)
 605                 return false;
 606         if (features->oPid != HID_ANY_ID && sibling->product != oPid)
 607                 return false;
 608
 609         /*
 610          * Devices with the same VID/PID must share the same physical
 611          * device path, while those with different VID/PID must share
 612          * the same physical parent device path.
 613          */
 614         if (hdev->vendor == sibling->vendor && hdev->product == sibling->product) {
 615                 if (!compare_device_paths(hdev, sibling, '/'))
 616                         return false;
 617         } else {
 618                 if (!compare_device_paths(hdev, sibling, '.'))
 619                         return false;
 620         }
 621
 622         /* Skip the remaining heuristics unless you are a HID_GENERIC device */
 623         if (features->type != HID_GENERIC)
 624                 return true;
 625
 626         /*
 627          * Direct-input devices may not be siblings of indirect-input
 628          * devices.
 629          */
 630         if ((features->device_type & WACOM_DEVICETYPE_DIRECT) &&
 631             !(sibling_features->device_type & WACOM_DEVICETYPE_DIRECT))
 632                 return false;
 633
 634         /*
 635          * Indirect-input devices may not be siblings of direct-input
 636          * devices.
 637          */
 638         if (!(features->device_type & WACOM_DEVICETYPE_DIRECT) &&
 639             (sibling_features->device_type & WACOM_DEVICETYPE_DIRECT))
 640                 return false;
 641
 642         /* Pen devices may only be siblings of touch devices */
 643         if ((features->device_type & WACOM_DEVICETYPE_PEN) &&
 644             !(sibling_features->device_type & WACOM_DEVICETYPE_TOUCH))
 645                 return false;
 646
 647         /* Touch devices may only be siblings of pen devices */
 648         if ((features->device_type & WACOM_DEVICETYPE_TOUCH) &&
 649             !(sibling_features->device_type & WACOM_DEVICETYPE_PEN))
 650                 return false;
 651
 652         /*
 653          * No reason could be found for these two devices to NOT be
 654          * siblings, so there's a good chance they ARE siblings
 655          */
 656         return true;
 657 }
 658
 659 static struct wacom_hdev_data *wacom_get_hdev_data(struct hid_device *hdev)
 660 {
 661         struct wacom_hdev_data *data;
 662
 663         /* Try to find an already-probed interface from the same device */
 664         list_for_each_entry(data, &wacom_udev_list, list) {
 665                 if (compare_device_paths(hdev, data->dev, '/'))
 666                         return data;
 667         }
 668
 669         /* Fallback to finding devices that appear to be "siblings" */
 670         list_for_each_entry(data, &wacom_udev_list, list) {
 671                 if (wacom_are_sibling(hdev, data->dev)) {
 672                         kref_get(&data->kref);
 673                         return data;
 674                 }
 675         }
 676
 677         return NULL;
 678 }
 679
 680 static void wacom_release_shared_data(struct kref *kref)
 681 {
 682         struct wacom_hdev_data *data =
 683                 container_of(kref, struct wacom_hdev_data, kref);
 684
 685         mutex_lock(&wacom_udev_list_lock);
 686         list_del(&data->list);
 687         mutex_unlock(&wacom_udev_list_lock);
 688
 689         kfree(data);
 690 }
 691
 692 static void wacom_remove_shared_data(void *res)
 693 {
 694         struct wacom *wacom = res;
 695         struct wacom_hdev_data *data;
 696         struct wacom_wac *wacom_wac = &wacom->wacom_wac;
 697
 698         if (wacom_wac->shared) {
 699                 data = container_of(wacom_wac->shared, struct wacom_hdev_data,
 700                                     shared);
 701
 702                 if (wacom_wac->shared->touch == wacom->hdev)
 703                         wacom_wac->shared->touch = NULL;
 704                 else if (wacom_wac->shared->pen == wacom->hdev)
 705                         wacom_wac->shared->pen = NULL;
 706
 707                 kref_put(&data->kref, wacom_release_shared_data);
 708                 wacom_wac->shared = NULL;
 709         }
 710 }
 711
 712 static int wacom_add_shared_data(struct hid_device *hdev)
 713 {
 714         struct wacom *wacom = hid_get_drvdata(hdev);
 715         struct wacom_wac *wacom_wac = &wacom->wacom_wac;
 716         struct wacom_hdev_data *data;
 717         int retval = 0;
 718
 719         mutex_lock(&wacom_udev_list_lock);
 720
 721         data = wacom_get_hdev_data(hdev);
 722         if (!data) {
 723                 data = kzalloc(sizeof(struct wacom_hdev_data), GFP_KERNEL);
 724                 if (!data) {
 725                         retval = -ENOMEM;
 726                         goto out;
 727                 }
 728
 729                 kref_init(&data->kref);
 730                 data->dev = hdev;
 731                 list_add_tail(&data->list, &wacom_udev_list);
 732         }
 733
 734         wacom_wac->shared = &data->shared;
 735
 736         retval = devm_add_action(&hdev->dev, wacom_remove_shared_data, wacom);
 737         if (retval) {
 738                 mutex_unlock(&wacom_udev_list_lock);
 739                 wacom_remove_shared_data(wacom);
 740                 return retval;
 741         }
 742
 743 out:
 744         mutex_unlock(&wacom_udev_list_lock);
 745         return retval;
 746 }
 747
 748 static int wacom_led_control(struct wacom *wacom)
 749 {
 750         unsigned char *buf;
 751         int retval;
 752         unsigned char report_id = WAC_CMD_LED_CONTROL;
 753         int buf_size = 9;
 754
 755         if (!hid_get_drvdata(wacom->hdev))
 756                 return -ENODEV;
 757
 758         if (!wacom->led.groups)
 759                 return -ENOTSUPP;
 760
 761         if (wacom->wacom_wac.pid) { /* wireless connected */
 762                 report_id = WAC_CMD_WL_LED_CONTROL;
 763                 buf_size = 13;
 764         }
 765         buf = kzalloc(buf_size, GFP_KERNEL);
 766         if (!buf)
 767                 return -ENOMEM;
 768
 769         if (wacom->wacom_wac.features.type >= INTUOS5S &&
 770             wacom->wacom_wac.features.type <= INTUOSPL) {
 771                 /*
 772                  * Touch Ring and crop mark LED luminance may take on
 773                  * one of four values:
 774                  *    0 = Low; 1 = Medium; 2 = High; 3 = Off
 775                  */
 776                 int ring_led = wacom->led.groups[0].select & 0x03;
 777                 int ring_lum = (((wacom->led.llv & 0x60) >> 5) - 1) & 0x03;
 778                 int crop_lum = 0;
 779                 unsigned char led_bits = (crop_lum << 4) | (ring_lum << 2) | (ring_led);
 780
 781                 buf[0] = report_id;
 782                 if (wacom->wacom_wac.pid) {
 783                         wacom_get_report(wacom->hdev, HID_FEATURE_REPORT,
 784                                          buf, buf_size, WAC_CMD_RETRIES);
 785                         buf[0] = report_id;
 786                         buf[4] = led_bits;
 787                 } else
 788                         buf[1] = led_bits;
 789         }
 790         else {
 791                 int led = wacom->led.groups[0].select | 0x4;
 792
 793                 if (wacom->wacom_wac.features.type == WACOM_21UX2 ||
 794                     wacom->wacom_wac.features.type == WACOM_24HD)
 795                         led |= (wacom->led.groups[1].select << 4) | 0x40;
 796
 797                 buf[0] = report_id;
 798                 buf[1] = led;
 799                 buf[2] = wacom->led.llv;
 800                 buf[3] = wacom->led.hlv;
 801                 buf[4] = wacom->led.img_lum;
 802         }
 803
 804         retval = wacom_set_report(wacom->hdev, HID_FEATURE_REPORT, buf, buf_size,
 805                                   WAC_CMD_RETRIES);
 806         kfree(buf);
 807
 808         return retval;
 809 }
 810
 811 static int wacom_led_putimage(struct wacom *wacom, int button_id, u8 xfer_id,
 812                 const unsigned len, const void *img)
 813 {
 814         unsigned char *buf;
 815         int i, retval;
 816         const unsigned chunk_len = len / 4; /* 4 chunks are needed to be sent */
 817
 818         buf = kzalloc(chunk_len + 3 , GFP_KERNEL);
 819         if (!buf)
 820                 return -ENOMEM;
 821
 822         /* Send 'start' command */
 823         buf[0] = WAC_CMD_ICON_START;
 824         buf[1] = 1;
 825         retval = wacom_set_report(wacom->hdev, HID_FEATURE_REPORT, buf, 2,
 826                                   WAC_CMD_RETRIES);
 827         if (retval < 0)
 828                 goto out;
 829
 830         buf[0] = xfer_id;
 831         buf[1] = button_id & 0x07;
 832         for (i = 0; i < 4; i++) {
 833                 buf[2] = i;
 834                 memcpy(buf + 3, img + i * chunk_len, chunk_len);
 835
 836                 retval = wacom_set_report(wacom->hdev, HID_FEATURE_REPORT,
 837                                           buf, chunk_len + 3, WAC_CMD_RETRIES);
 838                 if (retval < 0)
 839                         break;
 840         }
 841
 842         /* Send 'stop' */
 843         buf[0] = WAC_CMD_ICON_START;
 844         buf[1] = 0;
 845         wacom_set_report(wacom->hdev, HID_FEATURE_REPORT, buf, 2,
 846                          WAC_CMD_RETRIES);
 847
 848 out:
 849         kfree(buf);
 850         return retval;
 851 }
 852
 853 static ssize_t wacom_led_select_store(struct device *dev, int set_id,
 854                                       const char *buf, size_t count)
 855 {
 856         struct hid_device *hdev = to_hid_device(dev);
 857         struct wacom *wacom = hid_get_drvdata(hdev);
 858         unsigned int id;
 859         int err;
 860
 861         err = kstrtouint(buf, 10, &id);
 862         if (err)
 863                 return err;
 864
 865         mutex_lock(&wacom->lock);
 866
 867         wacom->led.groups[set_id].select = id & 0x3;
 868         err = wacom_led_control(wacom);
 869
 870         mutex_unlock(&wacom->lock);
 871
 872         return err < 0 ? err : count;
 873 }
 874
 875 #define DEVICE_LED_SELECT_ATTR(SET_ID)                                  \
 876 static ssize_t wacom_led##SET_ID##_select_store(struct device *dev,     \
 877         struct device_attribute *attr, const char *buf, size_t count)   \
 878 {                                                                       \
 879         return wacom_led_select_store(dev, SET_ID, buf, count);         \
 880 }                                                                       \
 881 static ssize_t wacom_led##SET_ID##_select_show(struct device *dev,      \
 882         struct device_attribute *attr, char *buf)                       \
 883 {                                                                       \
 884         struct hid_device *hdev = to_hid_device(dev);\
 885         struct wacom *wacom = hid_get_drvdata(hdev);                    \
 886         return scnprintf(buf, PAGE_SIZE, "%d\n",                        \
 887                          wacom->led.groups[SET_ID].select);             \
 888 }                                                                       \
 889 static DEVICE_ATTR(status_led##SET_ID##_select, DEV_ATTR_RW_PERM,       \
 890                     wacom_led##SET_ID##_select_show,                    \
 891                     wacom_led##SET_ID##_select_store)
 892
 893 DEVICE_LED_SELECT_ATTR(0);
 894 DEVICE_LED_SELECT_ATTR(1);
 895
 896 static ssize_t wacom_luminance_store(struct wacom *wacom, u8 *dest,
 897                                      const char *buf, size_t count)
 898 {
 899         unsigned int value;
 900         int err;
 901
 902         err = kstrtouint(buf, 10, &value);
 903         if (err)
 904                 return err;
 905
 906         mutex_lock(&wacom->lock);
 907
 908         *dest = value & 0x7f;
 909         err = wacom_led_control(wacom);
 910
 911         mutex_unlock(&wacom->lock);
 912
 913         return err < 0 ? err : count;
 914 }
 915
 916 #define DEVICE_LUMINANCE_ATTR(name, field)                              \
 917 static ssize_t wacom_##name##_luminance_store(struct device *dev,       \
 918         struct device_attribute *attr, const char *buf, size_t count)   \
 919 {                                                                       \
 920         struct hid_device *hdev = to_hid_device(dev);\
 921         struct wacom *wacom = hid_get_drvdata(hdev);                    \
 922                                                                         \
 923         return wacom_luminance_store(wacom, &wacom->led.field,          \
 924                                      buf, count);                       \
 925 }                                                                       \
 926 static ssize_t wacom_##name##_luminance_show(struct device *dev,        \
 927         struct device_attribute *attr, char *buf)                       \
 928 {                                                                       \
 929         struct wacom *wacom = dev_get_drvdata(dev);                     \
 930         return scnprintf(buf, PAGE_SIZE, "%d\n", wacom->led.field);     \
 931 }                                                                       \
 932 static DEVICE_ATTR(name##_luminance, DEV_ATTR_RW_PERM,                  \
 933                    wacom_##name##_luminance_show,                       \
 934                    wacom_##name##_luminance_store)
 935
 936 DEVICE_LUMINANCE_ATTR(status0, llv);
 937 DEVICE_LUMINANCE_ATTR(status1, hlv);
 938 DEVICE_LUMINANCE_ATTR(buttons, img_lum);
 939
 940 static ssize_t wacom_button_image_store(struct device *dev, int button_id,
 941                                         const char *buf, size_t count)
 942 {
 943         struct hid_device *hdev = to_hid_device(dev);
 944         struct wacom *wacom = hid_get_drvdata(hdev);
 945         int err;
 946         unsigned len;
 947         u8 xfer_id;
 948
 949         if (hdev->bus == BUS_BLUETOOTH) {
 950                 len = 256;
 951                 xfer_id = WAC_CMD_ICON_BT_XFER;
 952         } else {
 953                 len = 1024;
 954                 xfer_id = WAC_CMD_ICON_XFER;
 955         }
 956
 957         if (count != len)
 958                 return -EINVAL;
 959
 960         mutex_lock(&wacom->lock);
 961
 962         err = wacom_led_putimage(wacom, button_id, xfer_id, len, buf);
 963
 964         mutex_unlock(&wacom->lock);
 965
 966         return err < 0 ? err : count;
 967 }
 968
 969 #define DEVICE_BTNIMG_ATTR(BUTTON_ID)                                   \
 970 static ssize_t wacom_btnimg##BUTTON_ID##_store(struct device *dev,      \
 971         struct device_attribute *attr, const char *buf, size_t count)   \
 972 {                                                                       \
 973         return wacom_button_image_store(dev, BUTTON_ID, buf, count);    \
 974 }                                                                       \
 975 static DEVICE_ATTR(button##BUTTON_ID##_rawimg, DEV_ATTR_WO_PERM,        \
 976                    NULL, wacom_btnimg##BUTTON_ID##_store)
 977
 978 DEVICE_BTNIMG_ATTR(0);
 979 DEVICE_BTNIMG_ATTR(1);
 980 DEVICE_BTNIMG_ATTR(2);
 981 DEVICE_BTNIMG_ATTR(3);
 982 DEVICE_BTNIMG_ATTR(4);
 983 DEVICE_BTNIMG_ATTR(5);
 984 DEVICE_BTNIMG_ATTR(6);
 985 DEVICE_BTNIMG_ATTR(7);
 986
 987 static struct attribute *cintiq_led_attrs[] = {
 988         &dev_attr_status_led0_select.attr,
 989         &dev_attr_status_led1_select.attr,
 990         NULL
 991 };
 992
 993 static struct attribute_group cintiq_led_attr_group = {
 994         .name = "wacom_led",
 995         .attrs = cintiq_led_attrs,
 996 };
 997
 998 static struct attribute *intuos4_led_attrs[] = {
 999         &dev_attr_status0_luminance.attr,
1000         &dev_attr_status1_luminance.attr,
1001         &dev_attr_status_led0_select.attr,
1002         &dev_attr_buttons_luminance.attr,
1003         &dev_attr_button0_rawimg.attr,
1004         &dev_attr_button1_rawimg.attr,
1005         &dev_attr_button2_rawimg.attr,
1006         &dev_attr_button3_rawimg.attr,
1007         &dev_attr_button4_rawimg.attr,
1008         &dev_attr_button5_rawimg.attr,
1009         &dev_attr_button6_rawimg.attr,
1010         &dev_attr_button7_rawimg.attr,
1011         NULL
1012 };
1013
1014 static struct attribute_group intuos4_led_attr_group = {
1015         .name = "wacom_led",
1016         .attrs = intuos4_led_attrs,
1017 };
1018
1019 static struct attribute *intuos5_led_attrs[] = {
1020         &dev_attr_status0_luminance.attr,
1021         &dev_attr_status_led0_select.attr,
1022         NULL
1023 };
1024
1025 static struct attribute_group intuos5_led_attr_group = {
1026         .name = "wacom_led",
1027         .attrs = intuos5_led_attrs,
1028 };
1029
1030 struct wacom_sysfs_group_devres {
1031         struct attribute_group *group;
1032         struct kobject *root;
1033 };
1034
1035 static void wacom_devm_sysfs_group_release(struct device *dev, void *res)
1036 {
1037         struct wacom_sysfs_group_devres *devres = res;
1038         struct kobject *kobj = devres->root;
1039
1040         dev_dbg(dev, "%s: dropping reference to %s\n",
1041                 __func__, devres->group->name);
1042         sysfs_remove_group(kobj, devres->group);
1043 }
1044
1045 static int __wacom_devm_sysfs_create_group(struct wacom *wacom,
1046                                            struct kobject *root,
1047                                            struct attribute_group *group)
1048 {
1049         struct wacom_sysfs_group_devres *devres;
1050         int error;
1051
1052         devres = devres_alloc(wacom_devm_sysfs_group_release,
1053                               sizeof(struct wacom_sysfs_group_devres),
1054                               GFP_KERNEL);
1055         if (!devres)
1056                 return -ENOMEM;
1057
1058         devres->group = group;
1059         devres->root = root;
1060
1061         error = sysfs_create_group(devres->root, group);
1062         if (error)
1063                 return error;
1064
1065         devres_add(&wacom->hdev->dev, devres);
1066
1067         return 0;
1068 }
1069
1070 static int wacom_devm_sysfs_create_group(struct wacom *wacom,
1071                                          struct attribute_group *group)
1072 {
1073         return __wacom_devm_sysfs_create_group(wacom, &wacom->hdev->dev.kobj,
1074                                                group);
1075 }
1076
1077 enum led_brightness wacom_leds_brightness_get(struct wacom_led *led)
1078 {
1079         struct wacom *wacom = led->wacom;
1080
1081         if (wacom->led.max_hlv)
1082                 return led->hlv * LED_FULL / wacom->led.max_hlv;
1083
1084         if (wacom->led.max_llv)
1085                 return led->llv * LED_FULL / wacom->led.max_llv;
1086
1087         /* device doesn't support brightness tuning */
1088         return LED_FULL;
1089 }
1090
1091 static enum led_brightness __wacom_led_brightness_get(struct led_classdev *cdev)
1092 {
1093         struct wacom_led *led = container_of(cdev, struct wacom_led, cdev);
1094         struct wacom *wacom = led->wacom;
1095
1096         if (wacom->led.groups[led->group].select != led->id)
1097                 return LED_OFF;
1098
1099         return wacom_leds_brightness_get(led);
1100 }
1101
1102 static int wacom_led_brightness_set(struct led_classdev *cdev,
1103                                     enum led_brightness brightness)
1104 {
1105         struct wacom_led *led = container_of(cdev, struct wacom_led, cdev);
1106         struct wacom *wacom = led->wacom;
1107         int error;
1108
1109         mutex_lock(&wacom->lock);
1110
1111         if (!wacom->led.groups || (brightness == LED_OFF &&
1112             wacom->led.groups[led->group].select != led->id)) {
1113                 error = 0;
1114                 goto out;
1115         }
1116
1117         led->llv = wacom->led.llv = wacom->led.max_llv * brightness / LED_FULL;
1118         led->hlv = wacom->led.hlv = wacom->led.max_hlv * brightness / LED_FULL;
1119
1120         wacom->led.groups[led->group].select = led->id;
1121
1122         error = wacom_led_control(wacom);
1123
1124 out:
1125         mutex_unlock(&wacom->lock);
1126
1127         return error;
1128 }
1129
1130 static void wacom_led_readonly_brightness_set(struct led_classdev *cdev,
1131                                                enum led_brightness brightness)
1132 {
1133 }
1134
1135 static int wacom_led_register_one(struct device *dev, struct wacom *wacom,
1136                                   struct wacom_led *led, unsigned int group,
1137                                   unsigned int id, bool read_only)
1138 {
1139         int error;
1140         char *name;
1141
1142         name = devm_kasprintf(dev, GFP_KERNEL,
1143                               "%s::wacom-%d.%d",
1144                               dev_name(dev),
1145                               group,
1146                               id);
1147         if (!name)
1148                 return -ENOMEM;
1149
1150         if (!read_only) {
1151                 led->trigger.name = name;
1152                 error = devm_led_trigger_register(dev, &led->trigger);
1153                 if (error) {
1154                         hid_err(wacom->hdev,
1155                                 "failed to register LED trigger %s: %d\n",
1156                                 led->cdev.name, error);
1157                         return error;
1158                 }
1159         }
1160
1161         led->group = group;
1162         led->id = id;
1163         led->wacom = wacom;
1164         led->llv = wacom->led.llv;
1165         led->hlv = wacom->led.hlv;
1166         led->cdev.name = name;
1167         led->cdev.max_brightness = LED_FULL;
1168         led->cdev.flags = LED_HW_PLUGGABLE;
1169         led->cdev.brightness_get = __wacom_led_brightness_get;
1170         if (!read_only) {
1171                 led->cdev.brightness_set_blocking = wacom_led_brightness_set;
1172                 led->cdev.default_trigger = led->cdev.name;
1173         } else {
1174                 led->cdev.brightness_set = wacom_led_readonly_brightness_set;
1175         }
1176
1177         error = devm_led_classdev_register(dev, &led->cdev);
1178         if (error) {
1179                 hid_err(wacom->hdev,
1180                         "failed to register LED %s: %d\n",
1181                         led->cdev.name, error);
1182                 led->cdev.name = NULL;
1183                 return error;
1184         }
1185
1186         return 0;
1187 }
1188
1189 static void wacom_led_groups_release_one(void *data)
1190 {
1191         struct wacom_group_leds *group = data;
1192
1193         devres_release_group(group->dev, group);
1194 }
1195
1196 static int wacom_led_groups_alloc_and_register_one(struct device *dev,
1197                                                    struct wacom *wacom,
1198                                                    int group_id, int count,
1199                                                    bool read_only)
1200 {
1201         struct wacom_led *leds;
1202         int i, error;
1203
1204         if (group_id >= wacom->led.count || count <= 0)
1205                 return -EINVAL;
1206
1207         if (!devres_open_group(dev, &wacom->led.groups[group_id], GFP_KERNEL))
1208                 return -ENOMEM;
1209
1210         leds = devm_kzalloc(dev, sizeof(struct wacom_led) * count, GFP_KERNEL);
1211         if (!leds) {
1212                 error = -ENOMEM;
1213                 goto err;
1214         }
1215
1216         wacom->led.groups[group_id].leds = leds;
1217         wacom->led.groups[group_id].count = count;
1218
1219         for (i = 0; i < count; i++) {
1220                 error = wacom_led_register_one(dev, wacom, &leds[i],
1221                                                group_id, i, read_only);
1222                 if (error)
1223                         goto err;
1224         }
1225
1226         wacom->led.groups[group_id].dev = dev;
1227
1228         devres_close_group(dev, &wacom->led.groups[group_id]);
1229
1230         /*
1231          * There is a bug (?) in devm_led_classdev_register() in which its
1232          * increments the refcount of the parent. If the parent is an input
1233          * device, that means the ref count never reaches 0 when
1234          * devm_input_device_release() gets called.
1235          * This means that the LEDs are still there after disconnect.
1236          * Manually force the release of the group so that the leds are released
1237          * once we are done using them.
1238          */
1239         error = devm_add_action_or_reset(&wacom->hdev->dev,
1240                                          wacom_led_groups_release_one,
1241                                          &wacom->led.groups[group_id]);
1242         if (error)
1243                 return error;
1244
1245         return 0;
1246
1247 err:
1248         devres_release_group(dev, &wacom->led.groups[group_id]);
1249         return error;
1250 }
1251
1252 struct wacom_led *wacom_led_find(struct wacom *wacom, unsigned int group_id,
1253                                  unsigned int id)
1254 {
1255         struct wacom_group_leds *group;
1256
1257         if (group_id >= wacom->led.count)
1258                 return NULL;
1259
1260         group = &wacom->led.groups[group_id];
1261
1262         if (!group->leds)
1263                 return NULL;
1264
1265         id %= group->count;
1266
1267         return &group->leds[id];
1268 }
1269
1270 /**
1271  * wacom_led_next: gives the next available led with a wacom trigger.
1272  *
1273  * returns the next available struct wacom_led which has its default trigger
1274  * or the current one if none is available.
1275  */
1276 struct wacom_led *wacom_led_next(struct wacom *wacom, struct wacom_led *cur)
1277 {
1278         struct wacom_led *next_led;
1279         int group, next;
1280
1281         if (!wacom || !cur)
1282                 return NULL;
1283
1284         group = cur->group;
1285         next = cur->id;
1286
1287         do {
1288                 next_led = wacom_led_find(wacom, group, ++next);
1289                 if (!next_led || next_led == cur)
1290                         return next_led;
1291         } while (next_led->cdev.trigger != &next_led->trigger);
1292
1293         return next_led;
1294 }
1295
1296 static void wacom_led_groups_release(void *data)
1297 {
1298         struct wacom *wacom = data;
1299
1300         wacom->led.groups = NULL;
1301         wacom->led.count = 0;
1302 }
1303
1304 static int wacom_led_groups_allocate(struct wacom *wacom, int count)
1305 {
1306         struct device *dev = &wacom->hdev->dev;
1307         struct wacom_group_leds *groups;
1308         int error;
1309
1310         groups = devm_kzalloc(dev, sizeof(struct wacom_group_leds) * count,
1311                               GFP_KERNEL);
1312         if (!groups)
1313                 return -ENOMEM;
1314
1315         error = devm_add_action_or_reset(dev, wacom_led_groups_release, wacom);
1316         if (error)
1317                 return error;
1318
1319         wacom->led.groups = groups;
1320         wacom->led.count = count;
1321
1322         return 0;
1323 }
1324
1325 static int wacom_leds_alloc_and_register(struct wacom *wacom, int group_count,
1326                                          int led_per_group, bool read_only)
1327 {
1328         struct device *dev;
1329         int i, error;
1330
1331         if (!wacom->wacom_wac.pad_input)
1332                 return -EINVAL;
1333
1334         dev = &wacom->wacom_wac.pad_input->dev;
1335
1336         error = wacom_led_groups_allocate(wacom, group_count);
1337         if (error)
1338                 return error;
1339
1340         for (i = 0; i < group_count; i++) {
1341                 error = wacom_led_groups_alloc_and_register_one(dev, wacom, i,
1342                                                                 led_per_group,
1343                                                                 read_only);
1344                 if (error)
1345                         return error;
1346         }
1347
1348         return 0;
1349 }
1350
1351 static int wacom_initialize_leds(struct wacom *wacom)
1352 {
1353         int error;
1354
1355         if (!(wacom->wacom_wac.features.device_type & WACOM_DEVICETYPE_PAD))
1356                 return 0;
1357
1358         /* Initialize default values */
1359         switch (wacom->wacom_wac.features.type) {
1360         case INTUOS4S:
1361         case INTUOS4:
1362         case INTUOS4WL:
1363         case INTUOS4L:
1364                 wacom->led.llv = 10;
1365                 wacom->led.hlv = 20;
1366                 wacom->led.max_llv = 127;
1367                 wacom->led.max_hlv = 127;
1368                 wacom->led.img_lum = 10;
1369
1370                 error = wacom_leds_alloc_and_register(wacom, 1, 4, false);
1371                 if (error) {
1372                         hid_err(wacom->hdev,
1373                                 "cannot create leds err: %d\n", error);
1374                         return error;
1375                 }
1376
1377                 error = wacom_devm_sysfs_create_group(wacom,
1378                                                       &intuos4_led_attr_group);
1379                 break;
1380
1381         case WACOM_24HD:
1382         case WACOM_21UX2:
1383                 wacom->led.llv = 0;
1384                 wacom->led.hlv = 0;
1385                 wacom->led.img_lum = 0;
1386
1387                 error = wacom_leds_alloc_and_register(wacom, 2, 4, false);
1388                 if (error) {
1389                         hid_err(wacom->hdev,
1390                                 "cannot create leds err: %d\n", error);
1391                         return error;
1392                 }
1393
1394                 error = wacom_devm_sysfs_create_group(wacom,
1395                                                       &cintiq_led_attr_group);
1396                 break;
1397
1398         case INTUOS5S:
1399         case INTUOS5:
1400         case INTUOS5L:
1401         case INTUOSPS:
1402         case INTUOSPM:
1403         case INTUOSPL:
1404                 wacom->led.llv = 32;
1405                 wacom->led.max_llv = 96;
1406
1407                 error = wacom_leds_alloc_and_register(wacom, 1, 4, false);
1408                 if (error) {
1409                         hid_err(wacom->hdev,
1410                                 "cannot create leds err: %d\n", error);
1411                         return error;
1412                 }
1413
1414                 error = wacom_devm_sysfs_create_group(wacom,
1415                                                       &intuos5_led_attr_group);
1416                 break;
1417
1418         case REMOTE:
1419                 wacom->led.llv = 255;
1420                 wacom->led.max_llv = 255;
1421                 error = wacom_led_groups_allocate(wacom, 5);
1422                 if (error) {
1423                         hid_err(wacom->hdev,
1424                                 "cannot create leds err: %d\n", error);
1425                         return error;
1426                 }
1427                 return 0;
1428
1429         default:
1430                 return 0;
1431         }
1432
1433         if (error) {
1434                 hid_err(wacom->hdev,
1435                         "cannot create sysfs group err: %d\n", error);
1436                 return error;
1437         }
1438         wacom_led_control(wacom);
1439
1440         return 0;
1441 }
1442
1443 static enum power_supply_property wacom_battery_props[] = {
1444         POWER_SUPPLY_PROP_MODEL_NAME,
1445         POWER_SUPPLY_PROP_PRESENT,
1446         POWER_SUPPLY_PROP_STATUS,
1447         POWER_SUPPLY_PROP_SCOPE,
1448         POWER_SUPPLY_PROP_CAPACITY
1449 };
1450
1451 static int wacom_battery_get_property(struct power_supply *psy,
1452                                       enum power_supply_property psp,
1453                                       union power_supply_propval *val)
1454 {
1455         struct wacom_battery *battery = power_supply_get_drvdata(psy);
1456         int ret = 0;
1457
1458         switch (psp) {
1459                 case POWER_SUPPLY_PROP_MODEL_NAME:
1460                         val->strval = battery->wacom->wacom_wac.name;
1461                         break;
1462                 case POWER_SUPPLY_PROP_PRESENT:
1463                         val->intval = battery->bat_connected;
1464                         break;
1465                 case POWER_SUPPLY_PROP_SCOPE:
1466                         val->intval = POWER_SUPPLY_SCOPE_DEVICE;
1467                         break;
1468                 case POWER_SUPPLY_PROP_CAPACITY:
1469                         val->intval = battery->battery_capacity;
1470                         break;
1471                 case POWER_SUPPLY_PROP_STATUS:
1472                         if (battery->bat_charging)
1473                                 val->intval = POWER_SUPPLY_STATUS_CHARGING;
1474                         else if (battery->battery_capacity == 100 &&
1475                                     battery->ps_connected)
1476                                 val->intval = POWER_SUPPLY_STATUS_FULL;
1477                         else if (battery->ps_connected)
1478                                 val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING;
1479                         else
1480                                 val->intval = POWER_SUPPLY_STATUS_DISCHARGING;
1481                         break;
1482                 default:
1483                         ret = -EINVAL;
1484                         break;
1485         }
1486
1487         return ret;
1488 }
1489
1490 static int __wacom_initialize_battery(struct wacom *wacom,
1491                                       struct wacom_battery *battery)
1492 {
1493         static atomic_t battery_no = ATOMIC_INIT(0);
1494         struct device *dev = &wacom->hdev->dev;
1495         struct power_supply_config psy_cfg = { .drv_data = battery, };
1496         struct power_supply *ps_bat;
1497         struct power_supply_desc *bat_desc = &battery->bat_desc;
1498         unsigned long n;
1499         int error;
1500
1501         if (!devres_open_group(dev, bat_desc, GFP_KERNEL))
1502                 return -ENOMEM;
1503
1504         battery->wacom = wacom;
1505
1506         n = atomic_inc_return(&battery_no) - 1;
1507
1508         bat_desc->properties = wacom_battery_props;
1509         bat_desc->num_properties = ARRAY_SIZE(wacom_battery_props);
1510         bat_desc->get_property = wacom_battery_get_property;
1511         sprintf(battery->bat_name, "wacom_battery_%ld", n);
1512         bat_desc->name = battery->bat_name;
1513         bat_desc->type = POWER_SUPPLY_TYPE_USB;
1514         bat_desc->use_for_apm = 0;
1515
1516         ps_bat = devm_power_supply_register(dev, bat_desc, &psy_cfg);
1517         if (IS_ERR(ps_bat)) {
1518                 error = PTR_ERR(ps_bat);
1519                 goto err;
1520         }
1521
1522         power_supply_powers(ps_bat, &wacom->hdev->dev);
1523
1524         battery->battery = ps_bat;
1525
1526         devres_close_group(dev, bat_desc);
1527         return 0;
1528
1529 err:
1530         devres_release_group(dev, bat_desc);
1531         return error;
1532 }
1533
1534 static int wacom_initialize_battery(struct wacom *wacom)
1535 {
1536         if (wacom->wacom_wac.features.quirks & WACOM_QUIRK_BATTERY)
1537                 return __wacom_initialize_battery(wacom, &wacom->battery);
1538
1539         return 0;
1540 }
1541
1542 static void wacom_destroy_battery(struct wacom *wacom)
1543 {
1544         if (wacom->battery.battery) {
1545                 devres_release_group(&wacom->hdev->dev,
1546                                      &wacom->battery.bat_desc);
1547                 wacom->battery.battery = NULL;
1548         }
1549 }
1550
1551 static ssize_t wacom_show_speed(struct device *dev,
1552                                 struct device_attribute
1553                                 *attr, char *buf)
1554 {
1555         struct hid_device *hdev = to_hid_device(dev);
1556         struct wacom *wacom = hid_get_drvdata(hdev);
1557
1558         return snprintf(buf, PAGE_SIZE, "%i\n", wacom->wacom_wac.bt_high_speed);
1559 }
1560
1561 static ssize_t wacom_store_speed(struct device *dev,
1562                                 struct device_attribute *attr,
1563                                 const char *buf, size_t count)
1564 {
1565         struct hid_device *hdev = to_hid_device(dev);
1566         struct wacom *wacom = hid_get_drvdata(hdev);
1567         u8 new_speed;
1568
1569         if (kstrtou8(buf, 0, &new_speed))
1570                 return -EINVAL;
1571
1572         if (new_speed != 0 && new_speed != 1)
1573                 return -EINVAL;
1574
1575         wacom_bt_query_tablet_data(hdev, new_speed, &wacom->wacom_wac.features);
1576
1577         return count;
1578 }
1579
1580 static DEVICE_ATTR(speed, DEV_ATTR_RW_PERM,
1581                 wacom_show_speed, wacom_store_speed);
1582
1583
1584 static ssize_t wacom_show_remote_mode(struct kobject *kobj,
1585                                       struct kobj_attribute *kattr,
1586                                       char *buf, int index)
1587 {
1588         struct device *dev = kobj_to_dev(kobj->parent);
1589         struct hid_device *hdev = to_hid_device(dev);
1590         struct wacom *wacom = hid_get_drvdata(hdev);
1591         u8 mode;
1592
1593         mode = wacom->led.groups[index].select;
1594         if (mode >= 0 && mode < 3)
1595                 return snprintf(buf, PAGE_SIZE, "%d\n", mode);
1596         else
1597                 return snprintf(buf, PAGE_SIZE, "%d\n", -1);
1598 }
1599
1600 #define DEVICE_EKR_ATTR_GROUP(SET_ID)                                   \
1601 static ssize_t wacom_show_remote##SET_ID##_mode(struct kobject *kobj,   \
1602                                struct kobj_attribute *kattr, char *buf) \
1603 {                                                                       \
1604         return wacom_show_remote_mode(kobj, kattr, buf, SET_ID);        \
1605 }                                                                       \
1606 static struct kobj_attribute remote##SET_ID##_mode_attr = {             \
1607         .attr = {.name = "remote_mode",                                 \
1608                 .mode = DEV_ATTR_RO_PERM},                              \
1609         .show = wacom_show_remote##SET_ID##_mode,                       \
1610 };                                                                      \
1611 static struct attribute *remote##SET_ID##_serial_attrs[] = {            \
1612         &remote##SET_ID##_mode_attr.attr,                               \
1613         NULL                                                            \
1614 };                                                                      \
1615 static struct attribute_group remote##SET_ID##_serial_group = {         \
1616         .name = NULL,                                                   \
1617         .attrs = remote##SET_ID##_serial_attrs,                         \
1618 }
1619
1620 DEVICE_EKR_ATTR_GROUP(0);
1621 DEVICE_EKR_ATTR_GROUP(1);
1622 DEVICE_EKR_ATTR_GROUP(2);
1623 DEVICE_EKR_ATTR_GROUP(3);
1624 DEVICE_EKR_ATTR_GROUP(4);
1625
1626 static int wacom_remote_create_attr_group(struct wacom *wacom, __u32 serial,
1627                                           int index)
1628 {
1629         int error = 0;
1630         struct wacom_remote *remote = wacom->remote;
1631
1632         remote->remotes[index].group.name = devm_kasprintf(&wacom->hdev->dev,
1633                                                           GFP_KERNEL,
1634                                                           "%d", serial);
1635         if (!remote->remotes[index].group.name)
1636                 return -ENOMEM;
1637
1638         error = __wacom_devm_sysfs_create_group(wacom, remote->remote_dir,
1639                                                 &remote->remotes[index].group);
1640         if (error) {
1641                 remote->remotes[index].group.name = NULL;
1642                 hid_err(wacom->hdev,
1643                         "cannot create sysfs group err: %d\n", error);
1644                 return error;
1645         }
1646
1647         return 0;
1648 }
1649
1650 static int wacom_cmd_unpair_remote(struct wacom *wacom, unsigned char selector)
1651 {
1652         const size_t buf_size = 2;
1653         unsigned char *buf;
1654         int retval;
1655
1656         buf = kzalloc(buf_size, GFP_KERNEL);
1657         if (!buf)
1658                 return -ENOMEM;
1659
1660         buf[0] = WAC_CMD_DELETE_PAIRING;
1661         buf[1] = selector;
1662
1663         retval = wacom_set_report(wacom->hdev, HID_OUTPUT_REPORT, buf,
1664                                   buf_size, WAC_CMD_RETRIES);
1665         kfree(buf);
1666
1667         return retval;
1668 }
1669
1670 static ssize_t wacom_store_unpair_remote(struct kobject *kobj,
1671                                          struct kobj_attribute *attr,
1672                                          const char *buf, size_t count)
1673 {
1674         unsigned char selector = 0;
1675         struct device *dev = kobj_to_dev(kobj->parent);
1676         struct hid_device *hdev = to_hid_device(dev);
1677         struct wacom *wacom = hid_get_drvdata(hdev);
1678         int err;
1679
1680         if (!strncmp(buf, "*\n", 2)) {
1681                 selector = WAC_CMD_UNPAIR_ALL;
1682         } else {
1683                 hid_info(wacom->hdev, "remote: unrecognized unpair code: %s\n",
1684                          buf);
1685                 return -1;
1686         }
1687
1688         mutex_lock(&wacom->lock);
1689
1690         err = wacom_cmd_unpair_remote(wacom, selector);
1691         mutex_unlock(&wacom->lock);
1692
1693         return err < 0 ? err : count;
1694 }
1695
1696 static struct kobj_attribute unpair_remote_attr = {
1697         .attr = {.name = "unpair_remote", .mode = 0200},
1698         .store = wacom_store_unpair_remote,
1699 };
1700
1701 static const struct attribute *remote_unpair_attrs[] = {
1702         &unpair_remote_attr.attr,
1703         NULL
1704 };
1705
1706 static void wacom_remotes_destroy(void *data)
1707 {
1708         struct wacom *wacom = data;
1709         struct wacom_remote *remote = wacom->remote;
1710
1711         if (!remote)
1712                 return;
1713
1714         kobject_put(remote->remote_dir);
1715         kfifo_free(&remote->remote_fifo);
1716         wacom->remote = NULL;
1717 }
1718
1719 static int wacom_initialize_remotes(struct wacom *wacom)
1720 {
1721         int error = 0;
1722         struct wacom_remote *remote;
1723         int i;
1724
1725         if (wacom->wacom_wac.features.type != REMOTE)
1726                 return 0;
1727
1728         remote = devm_kzalloc(&wacom->hdev->dev, sizeof(*wacom->remote),
1729                               GFP_KERNEL);
1730         if (!remote)
1731                 return -ENOMEM;
1732
1733         wacom->remote = remote;
1734
1735         spin_lock_init(&remote->remote_lock);
1736
1737         error = kfifo_alloc(&remote->remote_fifo,
1738                         5 * sizeof(struct wacom_remote_data),
1739                         GFP_KERNEL);
1740         if (error) {
1741                 hid_err(wacom->hdev, "failed allocating remote_fifo\n");
1742                 return -ENOMEM;
1743         }
1744
1745         remote->remotes[0].group = remote0_serial_group;
1746         remote->remotes[1].group = remote1_serial_group;
1747         remote->remotes[2].group = remote2_serial_group;
1748         remote->remotes[3].group = remote3_serial_group;
1749         remote->remotes[4].group = remote4_serial_group;
1750
1751         remote->remote_dir = kobject_create_and_add("wacom_remote",
1752                                                     &wacom->hdev->dev.kobj);
1753         if (!remote->remote_dir)
1754                 return -ENOMEM;
1755
1756         error = sysfs_create_files(remote->remote_dir, remote_unpair_attrs);
1757
1758         if (error) {
1759                 hid_err(wacom->hdev,
1760                         "cannot create sysfs group err: %d\n", error);
1761                 return error;
1762         }
1763
1764         for (i = 0; i < WACOM_MAX_REMOTES; i++) {
1765                 wacom->led.groups[i].select = WACOM_STATUS_UNKNOWN;
1766                 remote->remotes[i].serial = 0;
1767         }
1768
1769         error = devm_add_action_or_reset(&wacom->hdev->dev,
1770                                          wacom_remotes_destroy, wacom);
1771         if (error)
1772                 return error;
1773
1774         return 0;
1775 }
1776
1777 static struct input_dev *wacom_allocate_input(struct wacom *wacom)
1778 {
1779         struct input_dev *input_dev;
1780         struct hid_device *hdev = wacom->hdev;
1781         struct wacom_wac *wacom_wac = &(wacom->wacom_wac);
1782
1783         input_dev = devm_input_allocate_device(&hdev->dev);
1784         if (!input_dev)
1785                 return NULL;
1786
1787         input_dev->name = wacom_wac->features.name;
1788         input_dev->phys = hdev->phys;
1789         input_dev->dev.parent = &hdev->dev;
1790         input_dev->open = wacom_open;
1791         input_dev->close = wacom_close;
1792         input_dev->uniq = hdev->uniq;
1793         input_dev->id.bustype = hdev->bus;
1794         input_dev->id.vendor  = hdev->vendor;
1795         input_dev->id.product = wacom_wac->pid ? wacom_wac->pid : hdev->product;
1796         input_dev->id.version = hdev->version;
1797         input_set_drvdata(input_dev, wacom);
1798
1799         return input_dev;
1800 }
1801
1802 static int wacom_allocate_inputs(struct wacom *wacom)
1803 {
1804         struct wacom_wac *wacom_wac = &(wacom->wacom_wac);
1805
1806         wacom_wac->pen_input = wacom_allocate_input(wacom);
1807         wacom_wac->touch_input = wacom_allocate_input(wacom);
1808         wacom_wac->pad_input = wacom_allocate_input(wacom);
1809         if (!wacom_wac->pen_input ||
1810             !wacom_wac->touch_input ||
1811             !wacom_wac->pad_input)
1812                 return -ENOMEM;
1813
1814         wacom_wac->pen_input->name = wacom_wac->pen_name;
1815         wacom_wac->touch_input->name = wacom_wac->touch_name;
1816         wacom_wac->pad_input->name = wacom_wac->pad_name;
1817
1818         return 0;
1819 }
1820
1821 static int wacom_register_inputs(struct wacom *wacom)
1822 {
1823         struct input_dev *pen_input_dev, *touch_input_dev, *pad_input_dev;
1824         struct wacom_wac *wacom_wac = &(wacom->wacom_wac);
1825         int error = 0;
1826
1827         pen_input_dev = wacom_wac->pen_input;
1828         touch_input_dev = wacom_wac->touch_input;
1829         pad_input_dev = wacom_wac->pad_input;
1830
1831         if (!pen_input_dev || !touch_input_dev || !pad_input_dev)
1832                 return -EINVAL;
1833
1834         error = wacom_setup_pen_input_capabilities(pen_input_dev, wacom_wac);
1835         if (error) {
1836                 /* no pen in use on this interface */
1837                 input_free_device(pen_input_dev);
1838                 wacom_wac->pen_input = NULL;
1839                 pen_input_dev = NULL;
1840         } else {
1841                 error = input_register_device(pen_input_dev);
1842                 if (error)
1843                         goto fail;
1844         }
1845
1846         error = wacom_setup_touch_input_capabilities(touch_input_dev, wacom_wac);
1847         if (error) {
1848                 /* no touch in use on this interface */
1849                 input_free_device(touch_input_dev);
1850                 wacom_wac->touch_input = NULL;
1851                 touch_input_dev = NULL;
1852         } else {
1853                 error = input_register_device(touch_input_dev);
1854                 if (error)
1855                         goto fail;
1856         }
1857
1858         error = wacom_setup_pad_input_capabilities(pad_input_dev, wacom_wac);
1859         if (error) {
1860                 /* no pad in use on this interface */
1861                 input_free_device(pad_input_dev);
1862                 wacom_wac->pad_input = NULL;
1863                 pad_input_dev = NULL;
1864         } else {
1865                 error = input_register_device(pad_input_dev);
1866                 if (error)
1867                         goto fail;
1868         }
1869
1870         return 0;
1871
1872 fail:
1873         wacom_wac->pad_input = NULL;
1874         wacom_wac->touch_input = NULL;
1875         wacom_wac->pen_input = NULL;
1876         return error;
1877 }
1878
1879 /*
1880  * Not all devices report physical dimensions from HID.
1881  * Compute the default from hardcoded logical dimension
1882  * and resolution before driver overwrites them.
1883  */
1884 static void wacom_set_default_phy(struct wacom_features *features)
1885 {
1886         if (features->x_resolution) {
1887                 features->x_phy = (features->x_max * 100) /
1888                                         features->x_resolution;
1889                 features->y_phy = (features->y_max * 100) /
1890                                         features->y_resolution;
1891         }
1892 }
1893
1894 static void wacom_calculate_res(struct wacom_features *features)
1895 {
1896         /* set unit to "100th of a mm" for devices not reported by HID */
1897         if (!features->unit) {
1898                 features->unit = 0x11;
1899                 features->unitExpo = -3;
1900         }
1901
1902         features->x_resolution = wacom_calc_hid_res(features->x_max,
1903                                                     features->x_phy,
1904                                                     features->unit,
1905                                                     features->unitExpo);
1906         features->y_resolution = wacom_calc_hid_res(features->y_max,
1907                                                     features->y_phy,
1908                                                     features->unit,
1909                                                     features->unitExpo);
1910 }
1911
1912 void wacom_battery_work(struct work_struct *work)
1913 {
1914         struct wacom *wacom = container_of(work, struct wacom, battery_work);
1915
1916         if ((wacom->wacom_wac.features.quirks & WACOM_QUIRK_BATTERY) &&
1917              !wacom->battery.battery) {
1918                 wacom_initialize_battery(wacom);
1919         }
1920         else if (!(wacom->wacom_wac.features.quirks & WACOM_QUIRK_BATTERY) &&
1921                  wacom->battery.battery) {
1922                 wacom_destroy_battery(wacom);
1923         }
1924 }
1925
1926 static size_t wacom_compute_pktlen(struct hid_device *hdev)
1927 {
1928         struct hid_report_enum *report_enum;
1929         struct hid_report *report;
1930         size_t size = 0;
1931
1932         report_enum = hdev->report_enum + HID_INPUT_REPORT;
1933
1934         list_for_each_entry(report, &report_enum->report_list, list) {
1935                 size_t report_size = hid_report_len(report);
1936                 if (report_size > size)
1937                         size = report_size;
1938         }
1939
1940         return size;
1941 }
1942
1943 static void wacom_update_name(struct wacom *wacom, const char *suffix)
1944 {
1945         struct wacom_wac *wacom_wac = &wacom->wacom_wac;
1946         struct wacom_features *features = &wacom_wac->features;
1947         char name[WACOM_NAME_MAX];
1948
1949         /* Generic devices name unspecified */
1950         if ((features->type == HID_GENERIC) && !strcmp("Wacom HID", features->name)) {
1951                 if (strstr(wacom->hdev->name, "Wacom") ||
1952                     strstr(wacom->hdev->name, "wacom") ||
1953                     strstr(wacom->hdev->name, "WACOM")) {
1954                         /* name is in HID descriptor, use it */
1955                         strlcpy(name, wacom->hdev->name, sizeof(name));
1956
1957                         /* strip out excess whitespaces */
1958                         while (1) {
1959                                 char *gap = strstr(name, "  ");
1960                                 if (gap == NULL)
1961                                         break;
1962                                 /* shift everything including the terminator */
1963                                 memmove(gap, gap+1, strlen(gap));
1964                         }
1965
1966                         /* strip off excessive prefixing */
1967                         if (strstr(name, "Wacom Co.,Ltd. Wacom ") == name) {
1968                                 int n = strlen(name);
1969                                 int x = strlen("Wacom Co.,Ltd. ");
1970                                 memmove(name, name+x, n-x+1);
1971                         }
1972                         if (strstr(name, "Wacom Co., Ltd. Wacom ") == name) {
1973                                 int n = strlen(name);
1974                                 int x = strlen("Wacom Co., Ltd. ");
1975                                 memmove(name, name+x, n-x+1);
1976                         }
1977
1978                         /* get rid of trailing whitespace */
1979                         if (name[strlen(name)-1] == ' ')
1980                                 name[strlen(name)-1] = '\0';
1981                 } else {
1982                         /* no meaningful name retrieved. use product ID */
1983                         snprintf(name, sizeof(name),
1984                                  "%s %X", features->name, wacom->hdev->product);
1985                 }
1986         } else {
1987                 strlcpy(name, features->name, sizeof(name));
1988         }
1989
1990         snprintf(wacom_wac->name, sizeof(wacom_wac->name), "%s%s",
1991                  name, suffix);
1992
1993         /* Append the device type to the name */
1994         snprintf(wacom_wac->pen_name, sizeof(wacom_wac->pen_name),
1995                 "%s%s Pen", name, suffix);
1996         snprintf(wacom_wac->touch_name, sizeof(wacom_wac->touch_name),
1997                 "%s%s Finger", name, suffix);
1998         snprintf(wacom_wac->pad_name, sizeof(wacom_wac->pad_name),
1999                 "%s%s Pad", name, suffix);
2000 }
2001
2002 static void wacom_release_resources(struct wacom *wacom)
2003 {
2004         struct hid_device *hdev = wacom->hdev;
2005
2006         if (!wacom->resources)
2007                 return;
2008
2009         devres_release_group(&hdev->dev, wacom);
2010
2011         wacom->resources = false;
2012
2013         wacom->wacom_wac.pen_input = NULL;
2014         wacom->wacom_wac.touch_input = NULL;
2015         wacom->wacom_wac.pad_input = NULL;
2016 }
2017
2018 static int wacom_parse_and_register(struct wacom *wacom, bool wireless)
2019 {
2020         struct wacom_wac *wacom_wac = &wacom->wacom_wac;
2021         struct wacom_features *features = &wacom_wac->features;
2022         struct hid_device *hdev = wacom->hdev;
2023         int error;
2024         unsigned int connect_mask = HID_CONNECT_HIDRAW;
2025
2026         features->pktlen = wacom_compute_pktlen(hdev);
2027         if (features->pktlen > WACOM_PKGLEN_MAX)
2028                 return -EINVAL;
2029
2030         if (!devres_open_group(&hdev->dev, wacom, GFP_KERNEL))
2031                 return -ENOMEM;
2032
2033         wacom->resources = true;
2034
2035         error = wacom_allocate_inputs(wacom);
2036         if (error)
2037                 goto fail;
2038
2039         error = wacom_add_shared_data(hdev);
2040         if (error)
2041                 goto fail;
2042
2043         /*
2044          * Bamboo Pad has a generic hid handling for the Pen, and we switch it
2045          * into debug mode for the touch part.
2046          * We ignore the other interfaces.
2047          */
2048         if (features->type == BAMBOO_PAD) {
2049                 if (features->pktlen == WACOM_PKGLEN_PENABLED) {
2050                         features->type = HID_GENERIC;
2051                 } else if ((features->pktlen != WACOM_PKGLEN_BPAD_TOUCH) &&
2052                            (features->pktlen != WACOM_PKGLEN_BPAD_TOUCH_USB)) {
2053                         error = -ENODEV;
2054                         goto fail;
2055                 }
2056         }
2057
2058         /* set the default size in case we do not get them from hid */
2059         wacom_set_default_phy(features);
2060
2061         /* Retrieve the physical and logical size for touch devices */
2062         wacom_retrieve_hid_descriptor(hdev, features);
2063         wacom_setup_device_quirks(wacom);
2064
2065         if (features->device_type == WACOM_DEVICETYPE_NONE &&
2066             features->type != WIRELESS) {
2067                 error = features->type == HID_GENERIC ? -ENODEV : 0;
2068
2069                 dev_warn(&hdev->dev, "Unknown device_type for '%s'. %s.",
2070                          hdev->name,
2071                          error ? "Ignoring" : "Assuming pen");
2072
2073                 if (error)
2074                         goto fail;
2075
2076                 features->device_type |= WACOM_DEVICETYPE_PEN;
2077         }
2078
2079         wacom_calculate_res(features);
2080
2081         wacom_update_name(wacom, wireless ? " (WL)" : "");
2082
2083         if (wacom_wac->features.device_type & WACOM_DEVICETYPE_TOUCH)
2084                 wacom_wac->shared->touch = hdev;
2085         else if (wacom_wac->features.device_type & WACOM_DEVICETYPE_PEN)
2086                 wacom_wac->shared->pen = hdev;
2087
2088         if (!(features->device_type & WACOM_DEVICETYPE_WL_MONITOR) &&
2089              (features->quirks & WACOM_QUIRK_BATTERY)) {
2090                 error = wacom_initialize_battery(wacom);
2091                 if (error)
2092                         goto fail;
2093         }
2094
2095         error = wacom_register_inputs(wacom);
2096         if (error)
2097                 goto fail;
2098
2099         if (wacom->wacom_wac.features.device_type & WACOM_DEVICETYPE_PAD) {
2100                 error = wacom_initialize_leds(wacom);
2101                 if (error)
2102                         goto fail;
2103
2104                 error = wacom_initialize_remotes(wacom);
2105                 if (error)
2106                         goto fail;
2107         }
2108
2109         if (features->type == HID_GENERIC)
2110                 connect_mask |= HID_CONNECT_DRIVER;
2111
2112         /* Regular HID work starts now */
2113         error = hid_hw_start(hdev, connect_mask);
2114         if (error) {
2115                 hid_err(hdev, "hw start failed\n");
2116                 goto fail;
2117         }
2118
2119         if (!wireless) {
2120                 /* Note that if query fails it is not a hard failure */
2121                 wacom_query_tablet_data(hdev, features);
2122         }
2123
2124         /* touch only Bamboo doesn't support pen */
2125         if ((features->type == BAMBOO_TOUCH) &&
2126             (features->device_type & WACOM_DEVICETYPE_PEN)) {
2127                 error = -ENODEV;
2128                 goto fail_quirks;
2129         }
2130
2131         /* pen only Bamboo neither support touch nor pad */
2132         if ((features->type == BAMBOO_PEN) &&
2133             ((features->device_type & WACOM_DEVICETYPE_TOUCH) ||
2134             (features->device_type & WACOM_DEVICETYPE_PAD))) {
2135                 error = -ENODEV;
2136                 goto fail_quirks;
2137         }
2138
2139         if (features->device_type & WACOM_DEVICETYPE_WL_MONITOR)
2140                 error = hid_hw_open(hdev);
2141
2142         if ((wacom_wac->features.type == INTUOSHT ||
2143              wacom_wac->features.type == INTUOSHT2) &&
2144             (wacom_wac->features.device_type & WACOM_DEVICETYPE_TOUCH)) {
2145                 wacom_wac->shared->type = wacom_wac->features.type;
2146                 wacom_wac->shared->touch_input = wacom_wac->touch_input;
2147         }
2148
2149         devres_close_group(&hdev->dev, wacom);
2150
2151         return 0;
2152
2153 fail_quirks:
2154         hid_hw_stop(hdev);
2155 fail:
2156         wacom_release_resources(wacom);
2157         return error;
2158 }
2159
2160 static void wacom_wireless_work(struct work_struct *work)
2161 {
2162         struct wacom *wacom = container_of(work, struct wacom, wireless_work);
2163         struct usb_device *usbdev = wacom->usbdev;
2164         struct wacom_wac *wacom_wac = &wacom->wacom_wac;
2165         struct hid_device *hdev1, *hdev2;
2166         struct wacom *wacom1, *wacom2;
2167         struct wacom_wac *wacom_wac1, *wacom_wac2;
2168         int error;
2169
2170         /*
2171          * Regardless if this is a disconnect or a new tablet,
2172          * remove any existing input and battery devices.
2173          */
2174
2175         wacom_destroy_battery(wacom);
2176
2177         /* Stylus interface */
2178         hdev1 = usb_get_intfdata(usbdev->config->interface[1]);
2179         wacom1 = hid_get_drvdata(hdev1);
2180         wacom_wac1 = &(wacom1->wacom_wac);
2181         wacom_release_resources(wacom1);
2182
2183         /* Touch interface */
2184         hdev2 = usb_get_intfdata(usbdev->config->interface[2]);
2185         wacom2 = hid_get_drvdata(hdev2);
2186         wacom_wac2 = &(wacom2->wacom_wac);
2187         wacom_release_resources(wacom2);
2188
2189         if (wacom_wac->pid == 0) {
2190                 hid_info(wacom->hdev, "wireless tablet disconnected\n");
2191         } else {
2192                 const struct hid_device_id *id = wacom_ids;
2193
2194                 hid_info(wacom->hdev, "wireless tablet connected with PID %x\n",
2195                          wacom_wac->pid);
2196
2197                 while (id->bus) {
2198                         if (id->vendor == USB_VENDOR_ID_WACOM &&
2199                             id->product == wacom_wac->pid)
2200                                 break;
2201                         id++;
2202                 }
2203
2204                 if (!id->bus) {
2205                         hid_info(wacom->hdev, "ignoring unknown PID.\n");
2206                         return;
2207                 }
2208
2209                 /* Stylus interface */
2210                 wacom_wac1->features =
2211                         *((struct wacom_features *)id->driver_data);
2212
2213                 wacom_wac1->pid = wacom_wac->pid;
2214                 hid_hw_stop(hdev1);
2215                 error = wacom_parse_and_register(wacom1, true);
2216                 if (error)
2217                         goto fail;
2218
2219                 /* Touch interface */
2220                 if (wacom_wac1->features.touch_max ||
2221                     (wacom_wac1->features.type >= INTUOSHT &&
2222                     wacom_wac1->features.type <= BAMBOO_PT)) {
2223                         wacom_wac2->features =
2224                                 *((struct wacom_features *)id->driver_data);
2225                         wacom_wac2->pid = wacom_wac->pid;
2226                         hid_hw_stop(hdev2);
2227                         error = wacom_parse_and_register(wacom2, true);
2228                         if (error)
2229                                 goto fail;
2230                 }
2231
2232                 strlcpy(wacom_wac->name, wacom_wac1->name,
2233                         sizeof(wacom_wac->name));
2234                 error = wacom_initialize_battery(wacom);
2235                 if (error)
2236                         goto fail;
2237         }
2238
2239         return;
2240
2241 fail:
2242         wacom_release_resources(wacom1);
2243         wacom_release_resources(wacom2);
2244         return;
2245 }
2246
2247 static void wacom_remote_destroy_one(struct wacom *wacom, unsigned int index)
2248 {
2249         struct wacom_remote *remote = wacom->remote;
2250         u32 serial = remote->remotes[index].serial;
2251         int i;
2252         unsigned long flags;
2253
2254         spin_lock_irqsave(&remote->remote_lock, flags);
2255         remote->remotes[index].registered = false;
2256         spin_unlock_irqrestore(&remote->remote_lock, flags);
2257
2258         if (remote->remotes[index].battery.battery)
2259                 devres_release_group(&wacom->hdev->dev,
2260                                      &remote->remotes[index].battery.bat_desc);
2261
2262         if (remote->remotes[index].group.name)
2263                 devres_release_group(&wacom->hdev->dev,
2264                                      &remote->remotes[index]);
2265
2266         for (i = 0; i < WACOM_MAX_REMOTES; i++) {
2267                 if (remote->remotes[i].serial == serial) {
2268                         remote->remotes[i].serial = 0;
2269                         remote->remotes[i].group.name = NULL;
2270                         remote->remotes[i].registered = false;
2271                         remote->remotes[i].battery.battery = NULL;
2272                         wacom->led.groups[i].select = WACOM_STATUS_UNKNOWN;
2273                 }
2274         }
2275 }
2276
2277 static int wacom_remote_create_one(struct wacom *wacom, u32 serial,
2278                                    unsigned int index)
2279 {
2280         struct wacom_remote *remote = wacom->remote;
2281         struct device *dev = &wacom->hdev->dev;
2282         int error, k;
2283
2284         /* A remote can pair more than once with an EKR,
2285          * check to make sure this serial isn't already paired.
2286          */
2287         for (k = 0; k < WACOM_MAX_REMOTES; k++) {
2288                 if (remote->remotes[k].serial == serial)
2289                         break;
2290         }
2291
2292         if (k < WACOM_MAX_REMOTES) {
2293                 remote->remotes[index].serial = serial;
2294                 return 0;
2295         }
2296
2297         if (!devres_open_group(dev, &remote->remotes[index], GFP_KERNEL))
2298                 return -ENOMEM;
2299
2300         error = wacom_remote_create_attr_group(wacom, serial, index);
2301         if (error)
2302                 goto fail;
2303
2304         remote->remotes[index].input = wacom_allocate_input(wacom);
2305         if (!remote->remotes[index].input) {
2306                 error = -ENOMEM;
2307                 goto fail;
2308         }
2309         remote->remotes[index].input->uniq = remote->remotes[index].group.name;
2310         remote->remotes[index].input->name = wacom->wacom_wac.pad_name;
2311
2312         if (!remote->remotes[index].input->name) {
2313                 error = -EINVAL;
2314                 goto fail;
2315         }
2316
2317         error = wacom_setup_pad_input_capabilities(remote->remotes[index].input,
2318                                                    &wacom->wacom_wac);
2319         if (error)
2320                 goto fail;
2321
2322         remote->remotes[index].serial = serial;
2323
2324         error = input_register_device(remote->remotes[index].input);
2325         if (error)
2326                 goto fail;
2327
2328         error = wacom_led_groups_alloc_and_register_one(
2329                                         &remote->remotes[index].input->dev,
2330                                         wacom, index, 3, true);
2331         if (error)
2332                 goto fail;
2333
2334         remote->remotes[index].registered = true;
2335
2336         devres_close_group(dev, &remote->remotes[index]);
2337         return 0;
2338
2339 fail:
2340         devres_release_group(dev, &remote->remotes[index]);
2341         remote->remotes[index].serial = 0;
2342         return error;
2343 }
2344
2345 static int wacom_remote_attach_battery(struct wacom *wacom, int index)
2346 {
2347         struct wacom_remote *remote = wacom->remote;
2348         int error;
2349
2350         if (!remote->remotes[index].registered)
2351                 return 0;
2352
2353         if (remote->remotes[index].battery.battery)
2354                 return 0;
2355
2356         if (wacom->led.groups[index].select == WACOM_STATUS_UNKNOWN)
2357                 return 0;
2358
2359         error = __wacom_initialize_battery(wacom,
2360                                         &wacom->remote->remotes[index].battery);
2361         if (error)
2362                 return error;
2363
2364         return 0;
2365 }
2366
2367 static void wacom_remote_work(struct work_struct *work)
2368 {
2369         struct wacom *wacom = container_of(work, struct wacom, remote_work);
2370         struct wacom_remote *remote = wacom->remote;
2371         struct wacom_remote_data data;
2372         unsigned long flags;
2373         unsigned int count;
2374         u32 serial;
2375         int i;
2376
2377         spin_lock_irqsave(&remote->remote_lock, flags);
2378
2379         count = kfifo_out(&remote->remote_fifo, &data, sizeof(data));
2380
2381         if (count != sizeof(data)) {
2382                 hid_err(wacom->hdev,
2383                         "workitem triggered without status available\n");
2384                 spin_unlock_irqrestore(&remote->remote_lock, flags);
2385                 return;
2386         }
2387
2388         if (!kfifo_is_empty(&remote->remote_fifo))
2389                 wacom_schedule_work(&wacom->wacom_wac, WACOM_WORKER_REMOTE);
2390
2391         spin_unlock_irqrestore(&remote->remote_lock, flags);
2392
2393         for (i = 0; i < WACOM_MAX_REMOTES; i++) {
2394                 serial = data.remote[i].serial;
2395                 if (data.remote[i].connected) {
2396
2397                         if (remote->remotes[i].serial == serial) {
2398                                 wacom_remote_attach_battery(wacom, i);
2399                                 continue;
2400                         }
2401
2402                         if (remote->remotes[i].serial)
2403                                 wacom_remote_destroy_one(wacom, i);
2404
2405                         wacom_remote_create_one(wacom, serial, i);
2406
2407                 } else if (remote->remotes[i].serial) {
2408                         wacom_remote_destroy_one(wacom, i);
2409                 }
2410         }
2411 }
2412
2413 static int wacom_probe(struct hid_device *hdev,
2414                 const struct hid_device_id *id)
2415 {
2416         struct usb_interface *intf = to_usb_interface(hdev->dev.parent);
2417         struct usb_device *dev = interface_to_usbdev(intf);
2418         struct wacom *wacom;
2419         struct wacom_wac *wacom_wac;
2420         struct wacom_features *features;
2421         int error;
2422
2423         if (!id->driver_data)
2424                 return -EINVAL;
2425
2426         hdev->quirks |= HID_QUIRK_NO_INIT_REPORTS;
2427
2428         /* hid-core sets this quirk for the boot interface */
2429         hdev->quirks &= ~HID_QUIRK_NOGET;
2430
2431         wacom = devm_kzalloc(&hdev->dev, sizeof(struct wacom), GFP_KERNEL);
2432         if (!wacom)
2433                 return -ENOMEM;
2434
2435         hid_set_drvdata(hdev, wacom);
2436         wacom->hdev = hdev;
2437
2438         wacom_wac = &wacom->wacom_wac;
2439         wacom_wac->features = *((struct wacom_features *)id->driver_data);
2440         features = &wacom_wac->features;
2441
2442         if (features->check_for_hid_type && features->hid_type != hdev->type) {
2443                 error = -ENODEV;
2444                 goto fail;
2445         }
2446
2447         wacom_wac->hid_data.inputmode = -1;
2448         wacom_wac->mode_report = -1;
2449
2450         wacom->usbdev = dev;
2451         wacom->intf = intf;
2452         mutex_init(&wacom->lock);
2453         INIT_WORK(&wacom->wireless_work, wacom_wireless_work);
2454         INIT_WORK(&wacom->battery_work, wacom_battery_work);
2455         INIT_WORK(&wacom->remote_work, wacom_remote_work);
2456
2457         /* ask for the report descriptor to be loaded by HID */
2458         error = hid_parse(hdev);
2459         if (error) {
2460                 hid_err(hdev, "parse failed\n");
2461                 goto fail;
2462         }
2463
2464         error = wacom_parse_and_register(wacom, false);
2465         if (error)
2466                 goto fail;
2467
2468         if (hdev->bus == BUS_BLUETOOTH) {
2469                 error = device_create_file(&hdev->dev, &dev_attr_speed);
2470                 if (error)
2471                         hid_warn(hdev,
2472                                  "can't create sysfs speed attribute err: %d\n",
2473                                  error);
2474         }
2475
2476         return 0;
2477
2478 fail:
2479         hid_set_drvdata(hdev, NULL);
2480         return error;
2481 }
2482
2483 static void wacom_remove(struct hid_device *hdev)
2484 {
2485         struct wacom *wacom = hid_get_drvdata(hdev);
2486         struct wacom_wac *wacom_wac = &wacom->wacom_wac;
2487         struct wacom_features *features = &wacom_wac->features;
2488
2489         if (features->device_type & WACOM_DEVICETYPE_WL_MONITOR)
2490                 hid_hw_close(hdev);
2491
2492         hid_hw_stop(hdev);
2493
2494         cancel_work_sync(&wacom->wireless_work);
2495         cancel_work_sync(&wacom->battery_work);
2496         cancel_work_sync(&wacom->remote_work);
2497         if (hdev->bus == BUS_BLUETOOTH)
2498                 device_remove_file(&hdev->dev, &dev_attr_speed);
2499
2500         hid_set_drvdata(hdev, NULL);
2501 }
2502
2503 #ifdef CONFIG_PM
2504 static int wacom_resume(struct hid_device *hdev)
2505 {
2506         struct wacom *wacom = hid_get_drvdata(hdev);
2507         struct wacom_features *features = &wacom->wacom_wac.features;
2508
2509         mutex_lock(&wacom->lock);
2510
2511         /* switch to wacom mode first */
2512         wacom_query_tablet_data(hdev, features);
2513         wacom_led_control(wacom);
2514
2515         mutex_unlock(&wacom->lock);
2516
2517         return 0;
2518 }
2519
2520 static int wacom_reset_resume(struct hid_device *hdev)
2521 {
2522         return wacom_resume(hdev);
2523 }
2524 #endif /* CONFIG_PM */
2525
2526 static struct hid_driver wacom_driver = {
2527         .name =         "wacom",
2528         .id_table =     wacom_ids,
2529         .probe =        wacom_probe,
2530         .remove =       wacom_remove,
2531         .report =       wacom_wac_report,
2532 #ifdef CONFIG_PM
2533         .resume =       wacom_resume,
2534         .reset_resume = wacom_reset_resume,
2535 #endif
2536         .raw_event =    wacom_raw_event,
2537 };
2538 module_hid_driver(wacom_driver);
2539
2540 MODULE_VERSION(DRIVER_VERSION);
2541 MODULE_AUTHOR(DRIVER_AUTHOR);
2542 MODULE_DESCRIPTION(DRIVER_DESC);
2543 MODULE_LICENSE(DRIVER_LICENSE);