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
 126         switch (usage->hid) {
 127         case HID_DG_CONTACTMAX:
 128                 /* leave touch_max as is if predefined */
 129                 if (!features->touch_max) {
 130                         /* read manually */
 131                         data = kzalloc(2, GFP_KERNEL);
 132                         if (!data)
 133                                 break;
 134                         data[0] = field->report->id;
 135                         ret = wacom_get_report(hdev, HID_FEATURE_REPORT,
 136                                                 data, 2, WAC_CMD_RETRIES);
 137                         if (ret == 2) {
 138                                 features->touch_max = data[1];
 139                         } else {
 140                                 features->touch_max = 16;
 141                                 hid_warn(hdev, "wacom_feature_mapping: "
 142                                          "could not get HID_DG_CONTACTMAX, "
 143                                          "defaulting to %d\n",
 144                                           features->touch_max);
 145                         }
 146                         kfree(data);
 147                 }
 148                 break;
 149         case HID_DG_INPUTMODE:
 150                 /* Ignore if value index is out of bounds. */
 151                 if (usage->usage_index >= field->report_count) {
 152                         dev_err(&hdev->dev, "HID_DG_INPUTMODE out of range\n");
 153                         break;
 154                 }
 155
 156                 hid_data->inputmode = field->report->id;
 157                 hid_data->inputmode_index = usage->usage_index;
 158                 break;
 159
 160         case HID_UP_DIGITIZER:
 161                 if (field->report->id == 0x0B &&
 162                     (field->application == WACOM_G9_DIGITIZER ||
 163                      field->application == WACOM_G11_DIGITIZER)) {
 164                         wacom->wacom_wac.mode_report = field->report->id;
 165                         wacom->wacom_wac.mode_value = 0;
 166                 }
 167                 break;
 168
 169         case WACOM_G9_PAGE:
 170         case WACOM_G11_PAGE:
 171                 if (field->report->id == 0x03 &&
 172                     (field->application == WACOM_G9_TOUCHSCREEN ||
 173                      field->application == WACOM_G11_TOUCHSCREEN)) {
 174                         wacom->wacom_wac.mode_report = field->report->id;
 175                         wacom->wacom_wac.mode_value = 0;
 176                 }
 177                 break;
 178         }
 179 }
 180
 181 /*
 182  * Interface Descriptor of wacom devices can be incomplete and
 183  * inconsistent so wacom_features table is used to store stylus
 184  * device's packet lengths, various maximum values, and tablet
 185  * resolution based on product ID's.
 186  *
 187  * For devices that contain 2 interfaces, wacom_features table is
 188  * inaccurate for the touch interface.  Since the Interface Descriptor
 189  * for touch interfaces has pretty complete data, this function exists
 190  * to query tablet for this missing information instead of hard coding in
 191  * an additional table.
 192  *
 193  * A typical Interface Descriptor for a stylus will contain a
 194  * boot mouse application collection that is not of interest and this
 195  * function will ignore it.
 196  *
 197  * It also contains a digitizer application collection that also is not
 198  * of interest since any information it contains would be duplicate
 199  * of what is in wacom_features. Usually it defines a report of an array
 200  * of bytes that could be used as max length of the stylus packet returned.
 201  * If it happens to define a Digitizer-Stylus Physical Collection then
 202  * the X and Y logical values contain valid data but it is ignored.
 203  *
 204  * A typical Interface Descriptor for a touch interface will contain a
 205  * Digitizer-Finger Physical Collection which will define both logical
 206  * X/Y maximum as well as the physical size of tablet. Since touch
 207  * interfaces haven't supported pressure or distance, this is enough
 208  * information to override invalid values in the wacom_features table.
 209  *
 210  * Intuos5 touch interface and 3rd gen Bamboo Touch do not contain useful
 211  * data. We deal with them after returning from this function.
 212  */
 213 static void wacom_usage_mapping(struct hid_device *hdev,
 214                 struct hid_field *field, struct hid_usage *usage)
 215 {
 216         struct wacom *wacom = hid_get_drvdata(hdev);
 217         struct wacom_features *features = &wacom->wacom_wac.features;
 218         bool finger = WACOM_FINGER_FIELD(field);
 219         bool pen = WACOM_PEN_FIELD(field);
 220
 221         /*
 222         * Requiring Stylus Usage will ignore boot mouse
 223         * X/Y values and some cases of invalid Digitizer X/Y
 224         * values commonly reported.
 225         */
 226         if (pen)
 227                 features->device_type |= WACOM_DEVICETYPE_PEN;
 228         else if (finger)
 229                 features->device_type |= WACOM_DEVICETYPE_TOUCH;
 230         else
 231                 return;
 232
 233         /*
 234          * Bamboo models do not support HID_DG_CONTACTMAX.
 235          * And, Bamboo Pen only descriptor contains touch.
 236          */
 237         if (features->type > BAMBOO_PT) {
 238                 /* ISDv4 touch devices at least supports one touch point */
 239                 if (finger && !features->touch_max)
 240                         features->touch_max = 1;
 241         }
 242
 243         switch (usage->hid) {
 244         case HID_GD_X:
 245                 features->x_max = field->logical_maximum;
 246                 if (finger) {
 247                         features->x_phy = field->physical_maximum;
 248                         if ((features->type != BAMBOO_PT) &&
 249                             (features->type != BAMBOO_TOUCH)) {
 250                                 features->unit = field->unit;
 251                                 features->unitExpo = field->unit_exponent;
 252                         }
 253                 }
 254                 break;
 255         case HID_GD_Y:
 256                 features->y_max = field->logical_maximum;
 257                 if (finger) {
 258                         features->y_phy = field->physical_maximum;
 259                         if ((features->type != BAMBOO_PT) &&
 260                             (features->type != BAMBOO_TOUCH)) {
 261                                 features->unit = field->unit;
 262                                 features->unitExpo = field->unit_exponent;
 263                         }
 264                 }
 265                 break;
 266         case HID_DG_TIPPRESSURE:
 267                 if (pen)
 268                         features->pressure_max = field->logical_maximum;
 269                 break;
 270         }
 271
 272         if (features->type == HID_GENERIC)
 273                 wacom_wac_usage_mapping(hdev, field, usage);
 274 }
 275
 276 static void wacom_post_parse_hid(struct hid_device *hdev,
 277                                  struct wacom_features *features)
 278 {
 279         struct wacom *wacom = hid_get_drvdata(hdev);
 280         struct wacom_wac *wacom_wac = &wacom->wacom_wac;
 281
 282         if (features->type == HID_GENERIC) {
 283                 /* Any last-minute generic device setup */
 284                 if (features->touch_max > 1) {
 285                         input_mt_init_slots(wacom_wac->touch_input, wacom_wac->features.touch_max,
 286                                     INPUT_MT_DIRECT);
 287                 }
 288         }
 289 }
 290
 291 static void wacom_parse_hid(struct hid_device *hdev,
 292                            struct wacom_features *features)
 293 {
 294         struct hid_report_enum *rep_enum;
 295         struct hid_report *hreport;
 296         int i, j;
 297
 298         /* check features first */
 299         rep_enum = &hdev->report_enum[HID_FEATURE_REPORT];
 300         list_for_each_entry(hreport, &rep_enum->report_list, list) {
 301                 for (i = 0; i < hreport->maxfield; i++) {
 302                         /* Ignore if report count is out of bounds. */
 303                         if (hreport->field[i]->report_count < 1)
 304                                 continue;
 305
 306                         for (j = 0; j < hreport->field[i]->maxusage; j++) {
 307                                 wacom_feature_mapping(hdev, hreport->field[i],
 308                                                 hreport->field[i]->usage + j);
 309                         }
 310                 }
 311         }
 312
 313         /* now check the input usages */
 314         rep_enum = &hdev->report_enum[HID_INPUT_REPORT];
 315         list_for_each_entry(hreport, &rep_enum->report_list, list) {
 316
 317                 if (!hreport->maxfield)
 318                         continue;
 319
 320                 for (i = 0; i < hreport->maxfield; i++)
 321                         for (j = 0; j < hreport->field[i]->maxusage; j++)
 322                                 wacom_usage_mapping(hdev, hreport->field[i],
 323                                                 hreport->field[i]->usage + j);
 324         }
 325
 326         wacom_post_parse_hid(hdev, features);
 327 }
 328
 329 static int wacom_hid_set_device_mode(struct hid_device *hdev)
 330 {
 331         struct wacom *wacom = hid_get_drvdata(hdev);
 332         struct hid_data *hid_data = &wacom->wacom_wac.hid_data;
 333         struct hid_report *r;
 334         struct hid_report_enum *re;
 335
 336         if (hid_data->inputmode < 0)
 337                 return 0;
 338
 339         re = &(hdev->report_enum[HID_FEATURE_REPORT]);
 340         r = re->report_id_hash[hid_data->inputmode];
 341         if (r) {
 342                 r->field[0]->value[hid_data->inputmode_index] = 2;
 343                 hid_hw_request(hdev, r, HID_REQ_SET_REPORT);
 344         }
 345         return 0;
 346 }
 347
 348 static int wacom_set_device_mode(struct hid_device *hdev,
 349                                  struct wacom_wac *wacom_wac)
 350 {
 351         u8 *rep_data;
 352         struct hid_report *r;
 353         struct hid_report_enum *re;
 354         int length;
 355         int error = -ENOMEM, limit = 0;
 356
 357         if (wacom_wac->mode_report < 0)
 358                 return 0;
 359
 360         re = &(hdev->report_enum[HID_FEATURE_REPORT]);
 361         r = re->report_id_hash[wacom_wac->mode_report];
 362         if (!r)
 363                 return -EINVAL;
 364
 365         rep_data = hid_alloc_report_buf(r, GFP_KERNEL);
 366         if (!rep_data)
 367                 return -ENOMEM;
 368
 369         length = hid_report_len(r);
 370
 371         do {
 372                 rep_data[0] = wacom_wac->mode_report;
 373                 rep_data[1] = wacom_wac->mode_value;
 374
 375                 error = wacom_set_report(hdev, HID_FEATURE_REPORT, rep_data,
 376                                          length, 1);
 377                 if (error >= 0)
 378                         error = wacom_get_report(hdev, HID_FEATURE_REPORT,
 379                                                  rep_data, length, 1);
 380         } while (error >= 0 &&
 381                  rep_data[1] != wacom_wac->mode_report &&
 382                  limit++ < WAC_MSG_RETRIES);
 383
 384         kfree(rep_data);
 385
 386         return error < 0 ? error : 0;
 387 }
 388
 389 static int wacom_bt_query_tablet_data(struct hid_device *hdev, u8 speed,
 390                 struct wacom_features *features)
 391 {
 392         struct wacom *wacom = hid_get_drvdata(hdev);
 393         int ret;
 394         u8 rep_data[2];
 395
 396         switch (features->type) {
 397         case GRAPHIRE_BT:
 398                 rep_data[0] = 0x03;
 399                 rep_data[1] = 0x00;
 400                 ret = wacom_set_report(hdev, HID_FEATURE_REPORT, rep_data, 2,
 401                                         3);
 402
 403                 if (ret >= 0) {
 404                         rep_data[0] = speed == 0 ? 0x05 : 0x06;
 405                         rep_data[1] = 0x00;
 406
 407                         ret = wacom_set_report(hdev, HID_FEATURE_REPORT,
 408                                                 rep_data, 2, 3);
 409
 410                         if (ret >= 0) {
 411                                 wacom->wacom_wac.bt_high_speed = speed;
 412                                 return 0;
 413                         }
 414                 }
 415
 416                 /*
 417                  * Note that if the raw queries fail, it's not a hard failure
 418                  * and it is safe to continue
 419                  */
 420                 hid_warn(hdev, "failed to poke device, command %d, err %d\n",
 421                          rep_data[0], ret);
 422                 break;
 423         case INTUOS4WL:
 424                 if (speed == 1)
 425                         wacom->wacom_wac.bt_features &= ~0x20;
 426                 else
 427                         wacom->wacom_wac.bt_features |= 0x20;
 428
 429                 rep_data[0] = 0x03;
 430                 rep_data[1] = wacom->wacom_wac.bt_features;
 431
 432                 ret = wacom_set_report(hdev, HID_FEATURE_REPORT, rep_data, 2,
 433                                         1);
 434                 if (ret >= 0)
 435                         wacom->wacom_wac.bt_high_speed = speed;
 436                 break;
 437         }
 438
 439         return 0;
 440 }
 441
 442 /*
 443  * Switch the tablet into its most-capable mode. Wacom tablets are
 444  * typically configured to power-up in a mode which sends mouse-like
 445  * reports to the OS. To get absolute position, pressure data, etc.
 446  * from the tablet, it is necessary to switch the tablet out of this
 447  * mode and into one which sends the full range of tablet data.
 448  */
 449 static int wacom_query_tablet_data(struct hid_device *hdev,
 450                 struct wacom_features *features)
 451 {
 452         struct wacom *wacom = hid_get_drvdata(hdev);
 453         struct wacom_wac *wacom_wac = &wacom->wacom_wac;
 454
 455         if (hdev->bus == BUS_BLUETOOTH)
 456                 return wacom_bt_query_tablet_data(hdev, 1, features);
 457
 458         if (features->type != HID_GENERIC) {
 459                 if (features->device_type & WACOM_DEVICETYPE_TOUCH) {
 460                         if (features->type > TABLETPC) {
 461                                 /* MT Tablet PC touch */
 462                                 wacom_wac->mode_report = 3;
 463                                 wacom_wac->mode_value = 4;
 464                         } else if (features->type == WACOM_24HDT) {
 465                                 wacom_wac->mode_report = 18;
 466                                 wacom_wac->mode_value = 2;
 467                         } else if (features->type == WACOM_27QHDT) {
 468                                 wacom_wac->mode_report = 131;
 469                                 wacom_wac->mode_value = 2;
 470                         } else if (features->type == BAMBOO_PAD) {
 471                                 wacom_wac->mode_report = 2;
 472                                 wacom_wac->mode_value = 2;
 473                         }
 474                 } else if (features->device_type & WACOM_DEVICETYPE_PEN) {
 475                         if (features->type <= BAMBOO_PT) {
 476                                 wacom_wac->mode_report = 2;
 477                                 wacom_wac->mode_value = 2;
 478                         }
 479                 }
 480         }
 481
 482         wacom_set_device_mode(hdev, wacom_wac);
 483
 484         if (features->type == HID_GENERIC)
 485                 return wacom_hid_set_device_mode(hdev);
 486
 487         return 0;
 488 }
 489
 490 static void wacom_retrieve_hid_descriptor(struct hid_device *hdev,
 491                                          struct wacom_features *features)
 492 {
 493         struct wacom *wacom = hid_get_drvdata(hdev);
 494         struct usb_interface *intf = wacom->intf;
 495
 496         /* default features */
 497         features->x_fuzz = 4;
 498         features->y_fuzz = 4;
 499         features->pressure_fuzz = 0;
 500         features->distance_fuzz = 1;
 501         features->tilt_fuzz = 1;
 502
 503         /*
 504          * The wireless device HID is basic and layout conflicts with
 505          * other tablets (monitor and touch interface can look like pen).
 506          * Skip the query for this type and modify defaults based on
 507          * interface number.
 508          */
 509         if (features->type == WIRELESS) {
 510                 if (intf->cur_altsetting->desc.bInterfaceNumber == 0)
 511                         features->device_type = WACOM_DEVICETYPE_WL_MONITOR;
 512                 else
 513                         features->device_type = WACOM_DEVICETYPE_NONE;
 514                 return;
 515         }
 516
 517         wacom_parse_hid(hdev, features);
 518 }
 519
 520 struct wacom_hdev_data {
 521         struct list_head list;
 522         struct kref kref;
 523         struct hid_device *dev;
 524         struct wacom_shared shared;
 525 };
 526
 527 static LIST_HEAD(wacom_udev_list);
 528 static DEFINE_MUTEX(wacom_udev_list_lock);
 529
 530 static bool wacom_are_sibling(struct hid_device *hdev,
 531                 struct hid_device *sibling)
 532 {
 533         struct wacom *wacom = hid_get_drvdata(hdev);
 534         struct wacom_features *features = &wacom->wacom_wac.features;
 535         int vid = features->oVid;
 536         int pid = features->oPid;
 537         int n1,n2;
 538
 539         if (vid == 0 && pid == 0) {
 540                 vid = hdev->vendor;
 541                 pid = hdev->product;
 542         }
 543
 544         if (vid != sibling->vendor || pid != sibling->product)
 545                 return false;
 546
 547         /* Compare the physical path. */
 548         n1 = strrchr(hdev->phys, '.') - hdev->phys;
 549         n2 = strrchr(sibling->phys, '.') - sibling->phys;
 550         if (n1 != n2 || n1 <= 0 || n2 <= 0)
 551                 return false;
 552
 553         return !strncmp(hdev->phys, sibling->phys, n1);
 554 }
 555
 556 static struct wacom_hdev_data *wacom_get_hdev_data(struct hid_device *hdev)
 557 {
 558         struct wacom_hdev_data *data;
 559
 560         list_for_each_entry(data, &wacom_udev_list, list) {
 561                 if (wacom_are_sibling(hdev, data->dev)) {
 562                         kref_get(&data->kref);
 563                         return data;
 564                 }
 565         }
 566
 567         return NULL;
 568 }
 569
 570 static void wacom_release_shared_data(struct kref *kref)
 571 {
 572         struct wacom_hdev_data *data =
 573                 container_of(kref, struct wacom_hdev_data, kref);
 574
 575         mutex_lock(&wacom_udev_list_lock);
 576         list_del(&data->list);
 577         mutex_unlock(&wacom_udev_list_lock);
 578
 579         kfree(data);
 580 }
 581
 582 static void wacom_remove_shared_data(void *res)
 583 {
 584         struct wacom *wacom = res;
 585         struct wacom_hdev_data *data;
 586         struct wacom_wac *wacom_wac = &wacom->wacom_wac;
 587
 588         if (wacom_wac->shared) {
 589                 data = container_of(wacom_wac->shared, struct wacom_hdev_data,
 590                                     shared);
 591
 592                 if (wacom_wac->shared->touch == wacom->hdev)
 593                         wacom_wac->shared->touch = NULL;
 594                 else if (wacom_wac->shared->pen == wacom->hdev)
 595                         wacom_wac->shared->pen = NULL;
 596
 597                 kref_put(&data->kref, wacom_release_shared_data);
 598                 wacom_wac->shared = NULL;
 599         }
 600 }
 601
 602 static int wacom_add_shared_data(struct hid_device *hdev)
 603 {
 604         struct wacom *wacom = hid_get_drvdata(hdev);
 605         struct wacom_wac *wacom_wac = &wacom->wacom_wac;
 606         struct wacom_hdev_data *data;
 607         int retval = 0;
 608
 609         mutex_lock(&wacom_udev_list_lock);
 610
 611         data = wacom_get_hdev_data(hdev);
 612         if (!data) {
 613                 data = kzalloc(sizeof(struct wacom_hdev_data), GFP_KERNEL);
 614                 if (!data) {
 615                         retval = -ENOMEM;
 616                         goto out;
 617                 }
 618
 619                 kref_init(&data->kref);
 620                 data->dev = hdev;
 621                 list_add_tail(&data->list, &wacom_udev_list);
 622         }
 623
 624         wacom_wac->shared = &data->shared;
 625
 626         retval = devm_add_action(&hdev->dev, wacom_remove_shared_data, wacom);
 627         if (retval) {
 628                 mutex_unlock(&wacom_udev_list_lock);
 629                 wacom_remove_shared_data(wacom);
 630                 return retval;
 631         }
 632
 633         if (wacom_wac->features.device_type & WACOM_DEVICETYPE_TOUCH)
 634                 wacom_wac->shared->touch = hdev;
 635         else if (wacom_wac->features.device_type & WACOM_DEVICETYPE_PEN)
 636                 wacom_wac->shared->pen = hdev;
 637
 638 out:
 639         mutex_unlock(&wacom_udev_list_lock);
 640         return retval;
 641 }
 642
 643 static int wacom_led_control(struct wacom *wacom)
 644 {
 645         unsigned char *buf;
 646         int retval;
 647         unsigned char report_id = WAC_CMD_LED_CONTROL;
 648         int buf_size = 9;
 649
 650         if (!wacom->led.groups)
 651                 return -ENOTSUPP;
 652
 653         if (wacom->wacom_wac.pid) { /* wireless connected */
 654                 report_id = WAC_CMD_WL_LED_CONTROL;
 655                 buf_size = 13;
 656         }
 657         buf = kzalloc(buf_size, GFP_KERNEL);
 658         if (!buf)
 659                 return -ENOMEM;
 660
 661         if (wacom->wacom_wac.features.type >= INTUOS5S &&
 662             wacom->wacom_wac.features.type <= INTUOSPL) {
 663                 /*
 664                  * Touch Ring and crop mark LED luminance may take on
 665                  * one of four values:
 666                  *    0 = Low; 1 = Medium; 2 = High; 3 = Off
 667                  */
 668                 int ring_led = wacom->led.groups[0].select & 0x03;
 669                 int ring_lum = (((wacom->led.llv & 0x60) >> 5) - 1) & 0x03;
 670                 int crop_lum = 0;
 671                 unsigned char led_bits = (crop_lum << 4) | (ring_lum << 2) | (ring_led);
 672
 673                 buf[0] = report_id;
 674                 if (wacom->wacom_wac.pid) {
 675                         wacom_get_report(wacom->hdev, HID_FEATURE_REPORT,
 676                                          buf, buf_size, WAC_CMD_RETRIES);
 677                         buf[0] = report_id;
 678                         buf[4] = led_bits;
 679                 } else
 680                         buf[1] = led_bits;
 681         }
 682         else {
 683                 int led = wacom->led.groups[0].select | 0x4;
 684
 685                 if (wacom->wacom_wac.features.type == WACOM_21UX2 ||
 686                     wacom->wacom_wac.features.type == WACOM_24HD)
 687                         led |= (wacom->led.groups[1].select << 4) | 0x40;
 688
 689                 buf[0] = report_id;
 690                 buf[1] = led;
 691                 buf[2] = wacom->led.llv;
 692                 buf[3] = wacom->led.hlv;
 693                 buf[4] = wacom->led.img_lum;
 694         }
 695
 696         retval = wacom_set_report(wacom->hdev, HID_FEATURE_REPORT, buf, buf_size,
 697                                   WAC_CMD_RETRIES);
 698         kfree(buf);
 699
 700         return retval;
 701 }
 702
 703 static int wacom_led_putimage(struct wacom *wacom, int button_id, u8 xfer_id,
 704                 const unsigned len, const void *img)
 705 {
 706         unsigned char *buf;
 707         int i, retval;
 708         const unsigned chunk_len = len / 4; /* 4 chunks are needed to be sent */
 709
 710         buf = kzalloc(chunk_len + 3 , GFP_KERNEL);
 711         if (!buf)
 712                 return -ENOMEM;
 713
 714         /* Send 'start' command */
 715         buf[0] = WAC_CMD_ICON_START;
 716         buf[1] = 1;
 717         retval = wacom_set_report(wacom->hdev, HID_FEATURE_REPORT, buf, 2,
 718                                   WAC_CMD_RETRIES);
 719         if (retval < 0)
 720                 goto out;
 721
 722         buf[0] = xfer_id;
 723         buf[1] = button_id & 0x07;
 724         for (i = 0; i < 4; i++) {
 725                 buf[2] = i;
 726                 memcpy(buf + 3, img + i * chunk_len, chunk_len);
 727
 728                 retval = wacom_set_report(wacom->hdev, HID_FEATURE_REPORT,
 729                                           buf, chunk_len + 3, WAC_CMD_RETRIES);
 730                 if (retval < 0)
 731                         break;
 732         }
 733
 734         /* Send 'stop' */
 735         buf[0] = WAC_CMD_ICON_START;
 736         buf[1] = 0;
 737         wacom_set_report(wacom->hdev, HID_FEATURE_REPORT, buf, 2,
 738                          WAC_CMD_RETRIES);
 739
 740 out:
 741         kfree(buf);
 742         return retval;
 743 }
 744
 745 static ssize_t wacom_led_select_store(struct device *dev, int set_id,
 746                                       const char *buf, size_t count)
 747 {
 748         struct hid_device *hdev = to_hid_device(dev);
 749         struct wacom *wacom = hid_get_drvdata(hdev);
 750         unsigned int id;
 751         int err;
 752
 753         err = kstrtouint(buf, 10, &id);
 754         if (err)
 755                 return err;
 756
 757         mutex_lock(&wacom->lock);
 758
 759         wacom->led.groups[set_id].select = id & 0x3;
 760         err = wacom_led_control(wacom);
 761
 762         mutex_unlock(&wacom->lock);
 763
 764         return err < 0 ? err : count;
 765 }
 766
 767 #define DEVICE_LED_SELECT_ATTR(SET_ID)                                  \
 768 static ssize_t wacom_led##SET_ID##_select_store(struct device *dev,     \
 769         struct device_attribute *attr, const char *buf, size_t count)   \
 770 {                                                                       \
 771         return wacom_led_select_store(dev, SET_ID, buf, count);         \
 772 }                                                                       \
 773 static ssize_t wacom_led##SET_ID##_select_show(struct device *dev,      \
 774         struct device_attribute *attr, char *buf)                       \
 775 {                                                                       \
 776         struct hid_device *hdev = to_hid_device(dev);\
 777         struct wacom *wacom = hid_get_drvdata(hdev);                    \
 778         return scnprintf(buf, PAGE_SIZE, "%d\n",                        \
 779                          wacom->led.groups[SET_ID].select);             \
 780 }                                                                       \
 781 static DEVICE_ATTR(status_led##SET_ID##_select, DEV_ATTR_RW_PERM,       \
 782                     wacom_led##SET_ID##_select_show,                    \
 783                     wacom_led##SET_ID##_select_store)
 784
 785 DEVICE_LED_SELECT_ATTR(0);
 786 DEVICE_LED_SELECT_ATTR(1);
 787
 788 static ssize_t wacom_luminance_store(struct wacom *wacom, u8 *dest,
 789                                      const char *buf, size_t count)
 790 {
 791         unsigned int value;
 792         int err;
 793
 794         err = kstrtouint(buf, 10, &value);
 795         if (err)
 796                 return err;
 797
 798         mutex_lock(&wacom->lock);
 799
 800         *dest = value & 0x7f;
 801         err = wacom_led_control(wacom);
 802
 803         mutex_unlock(&wacom->lock);
 804
 805         return err < 0 ? err : count;
 806 }
 807
 808 #define DEVICE_LUMINANCE_ATTR(name, field)                              \
 809 static ssize_t wacom_##name##_luminance_store(struct device *dev,       \
 810         struct device_attribute *attr, const char *buf, size_t count)   \
 811 {                                                                       \
 812         struct hid_device *hdev = to_hid_device(dev);\
 813         struct wacom *wacom = hid_get_drvdata(hdev);                    \
 814                                                                         \
 815         return wacom_luminance_store(wacom, &wacom->led.field,          \
 816                                      buf, count);                       \
 817 }                                                                       \
 818 static ssize_t wacom_##name##_luminance_show(struct device *dev,        \
 819         struct device_attribute *attr, char *buf)                       \
 820 {                                                                       \
 821         struct wacom *wacom = dev_get_drvdata(dev);                     \
 822         return scnprintf(buf, PAGE_SIZE, "%d\n", wacom->led.field);     \
 823 }                                                                       \
 824 static DEVICE_ATTR(name##_luminance, DEV_ATTR_RW_PERM,                  \
 825                    wacom_##name##_luminance_show,                       \
 826                    wacom_##name##_luminance_store)
 827
 828 DEVICE_LUMINANCE_ATTR(status0, llv);
 829 DEVICE_LUMINANCE_ATTR(status1, hlv);
 830 DEVICE_LUMINANCE_ATTR(buttons, img_lum);
 831
 832 static ssize_t wacom_button_image_store(struct device *dev, int button_id,
 833                                         const char *buf, size_t count)
 834 {
 835         struct hid_device *hdev = to_hid_device(dev);
 836         struct wacom *wacom = hid_get_drvdata(hdev);
 837         int err;
 838         unsigned len;
 839         u8 xfer_id;
 840
 841         if (hdev->bus == BUS_BLUETOOTH) {
 842                 len = 256;
 843                 xfer_id = WAC_CMD_ICON_BT_XFER;
 844         } else {
 845                 len = 1024;
 846                 xfer_id = WAC_CMD_ICON_XFER;
 847         }
 848
 849         if (count != len)
 850                 return -EINVAL;
 851
 852         mutex_lock(&wacom->lock);
 853
 854         err = wacom_led_putimage(wacom, button_id, xfer_id, len, buf);
 855
 856         mutex_unlock(&wacom->lock);
 857
 858         return err < 0 ? err : count;
 859 }
 860
 861 #define DEVICE_BTNIMG_ATTR(BUTTON_ID)                                   \
 862 static ssize_t wacom_btnimg##BUTTON_ID##_store(struct device *dev,      \
 863         struct device_attribute *attr, const char *buf, size_t count)   \
 864 {                                                                       \
 865         return wacom_button_image_store(dev, BUTTON_ID, buf, count);    \
 866 }                                                                       \
 867 static DEVICE_ATTR(button##BUTTON_ID##_rawimg, DEV_ATTR_WO_PERM,        \
 868                    NULL, wacom_btnimg##BUTTON_ID##_store)
 869
 870 DEVICE_BTNIMG_ATTR(0);
 871 DEVICE_BTNIMG_ATTR(1);
 872 DEVICE_BTNIMG_ATTR(2);
 873 DEVICE_BTNIMG_ATTR(3);
 874 DEVICE_BTNIMG_ATTR(4);
 875 DEVICE_BTNIMG_ATTR(5);
 876 DEVICE_BTNIMG_ATTR(6);
 877 DEVICE_BTNIMG_ATTR(7);
 878
 879 static struct attribute *cintiq_led_attrs[] = {
 880         &dev_attr_status_led0_select.attr,
 881         &dev_attr_status_led1_select.attr,
 882         NULL
 883 };
 884
 885 static struct attribute_group cintiq_led_attr_group = {
 886         .name = "wacom_led",
 887         .attrs = cintiq_led_attrs,
 888 };
 889
 890 static struct attribute *intuos4_led_attrs[] = {
 891         &dev_attr_status0_luminance.attr,
 892         &dev_attr_status1_luminance.attr,
 893         &dev_attr_status_led0_select.attr,
 894         &dev_attr_buttons_luminance.attr,
 895         &dev_attr_button0_rawimg.attr,
 896         &dev_attr_button1_rawimg.attr,
 897         &dev_attr_button2_rawimg.attr,
 898         &dev_attr_button3_rawimg.attr,
 899         &dev_attr_button4_rawimg.attr,
 900         &dev_attr_button5_rawimg.attr,
 901         &dev_attr_button6_rawimg.attr,
 902         &dev_attr_button7_rawimg.attr,
 903         NULL
 904 };
 905
 906 static struct attribute_group intuos4_led_attr_group = {
 907         .name = "wacom_led",
 908         .attrs = intuos4_led_attrs,
 909 };
 910
 911 static struct attribute *intuos5_led_attrs[] = {
 912         &dev_attr_status0_luminance.attr,
 913         &dev_attr_status_led0_select.attr,
 914         NULL
 915 };
 916
 917 static struct attribute_group intuos5_led_attr_group = {
 918         .name = "wacom_led",
 919         .attrs = intuos5_led_attrs,
 920 };
 921
 922 struct wacom_sysfs_group_devres {
 923         struct attribute_group *group;
 924         struct kobject *root;
 925 };
 926
 927 static void wacom_devm_sysfs_group_release(struct device *dev, void *res)
 928 {
 929         struct wacom_sysfs_group_devres *devres = res;
 930         struct kobject *kobj = devres->root;
 931
 932         dev_dbg(dev, "%s: dropping reference to %s\n",
 933                 __func__, devres->group->name);
 934         sysfs_remove_group(kobj, devres->group);
 935 }
 936
 937 static int __wacom_devm_sysfs_create_group(struct wacom *wacom,
 938                                            struct kobject *root,
 939                                            struct attribute_group *group)
 940 {
 941         struct wacom_sysfs_group_devres *devres;
 942         int error;
 943
 944         devres = devres_alloc(wacom_devm_sysfs_group_release,
 945                               sizeof(struct wacom_sysfs_group_devres),
 946                               GFP_KERNEL);
 947         if (!devres)
 948                 return -ENOMEM;
 949
 950         devres->group = group;
 951         devres->root = root;
 952
 953         error = sysfs_create_group(devres->root, group);
 954         if (error)
 955                 return error;
 956
 957         devres_add(&wacom->hdev->dev, devres);
 958
 959         return 0;
 960 }
 961
 962 static int wacom_devm_sysfs_create_group(struct wacom *wacom,
 963                                          struct attribute_group *group)
 964 {
 965         return __wacom_devm_sysfs_create_group(wacom, &wacom->hdev->dev.kobj,
 966                                                group);
 967 }
 968
 969 static void wacom_led_groups_release(void *data)
 970 {
 971         struct wacom *wacom = data;
 972
 973         wacom->led.groups = NULL;
 974 }
 975
 976 static int wacom_led_groups_allocate(struct wacom *wacom, int count)
 977 {
 978         struct wacom_group_leds *groups;
 979         int error;
 980
 981         groups = devm_kzalloc(&wacom->hdev->dev,
 982                               sizeof(struct wacom_group_leds) * count,
 983                               GFP_KERNEL);
 984         if (!groups)
 985                 return -ENOMEM;
 986
 987         error = devm_add_action_or_reset(&wacom->hdev->dev,
 988                                          wacom_led_groups_release,
 989                                          wacom);
 990         if (error)
 991                 return error;
 992
 993         wacom->led.groups = groups;
 994
 995         return 0;
 996 }
 997
 998 static int wacom_initialize_leds(struct wacom *wacom)
 999 {
1000         int error;
1001
1002         if (!(wacom->wacom_wac.features.device_type & WACOM_DEVICETYPE_PAD))
1003                 return 0;
1004
1005         /* Initialize default values */
1006         switch (wacom->wacom_wac.features.type) {
1007         case INTUOS4S:
1008         case INTUOS4:
1009         case INTUOS4WL:
1010         case INTUOS4L:
1011                 wacom->led.llv = 10;
1012                 wacom->led.hlv = 20;
1013                 wacom->led.img_lum = 10;
1014
1015                 error = wacom_led_groups_allocate(wacom, 1);
1016                 if (error) {
1017                         hid_err(wacom->hdev,
1018                                 "cannot create leds err: %d\n", error);
1019                         return error;
1020                 }
1021
1022                 error = wacom_devm_sysfs_create_group(wacom,
1023                                                       &intuos4_led_attr_group);
1024                 break;
1025
1026         case WACOM_24HD:
1027         case WACOM_21UX2:
1028                 wacom->led.llv = 0;
1029                 wacom->led.hlv = 0;
1030                 wacom->led.img_lum = 0;
1031
1032                 error = wacom_led_groups_allocate(wacom, 2);
1033                 if (error) {
1034                         hid_err(wacom->hdev,
1035                                 "cannot create leds err: %d\n", error);
1036                         return error;
1037                 }
1038
1039                 error = wacom_devm_sysfs_create_group(wacom,
1040                                                       &cintiq_led_attr_group);
1041                 break;
1042
1043         case INTUOS5S:
1044         case INTUOS5:
1045         case INTUOS5L:
1046         case INTUOSPS:
1047         case INTUOSPM:
1048         case INTUOSPL:
1049                 wacom->led.llv = 32;
1050                 wacom->led.hlv = 0;
1051                 wacom->led.img_lum = 0;
1052
1053                 error = wacom_led_groups_allocate(wacom, 1);
1054                 if (error) {
1055                         hid_err(wacom->hdev,
1056                                 "cannot create leds err: %d\n", error);
1057                         return error;
1058                 }
1059
1060                 error = wacom_devm_sysfs_create_group(wacom,
1061                                                       &intuos5_led_attr_group);
1062                 break;
1063
1064         case REMOTE:
1065                 error = wacom_led_groups_allocate(wacom, 5);
1066                 if (error) {
1067                         hid_err(wacom->hdev,
1068                                 "cannot create leds err: %d\n", error);
1069                         return error;
1070                 }
1071                 return 0;
1072
1073         default:
1074                 return 0;
1075         }
1076
1077         if (error) {
1078                 hid_err(wacom->hdev,
1079                         "cannot create sysfs group err: %d\n", error);
1080                 return error;
1081         }
1082         wacom_led_control(wacom);
1083
1084         return 0;
1085 }
1086
1087 static enum power_supply_property wacom_battery_props[] = {
1088         POWER_SUPPLY_PROP_PRESENT,
1089         POWER_SUPPLY_PROP_STATUS,
1090         POWER_SUPPLY_PROP_SCOPE,
1091         POWER_SUPPLY_PROP_CAPACITY
1092 };
1093
1094 static enum power_supply_property wacom_ac_props[] = {
1095         POWER_SUPPLY_PROP_PRESENT,
1096         POWER_SUPPLY_PROP_ONLINE,
1097         POWER_SUPPLY_PROP_SCOPE,
1098 };
1099
1100 static int wacom_battery_get_property(struct power_supply *psy,
1101                                       enum power_supply_property psp,
1102                                       union power_supply_propval *val)
1103 {
1104         struct wacom_battery *battery = power_supply_get_drvdata(psy);
1105         int ret = 0;
1106
1107         switch (psp) {
1108                 case POWER_SUPPLY_PROP_PRESENT:
1109                         val->intval = battery->bat_connected;
1110                         break;
1111                 case POWER_SUPPLY_PROP_SCOPE:
1112                         val->intval = POWER_SUPPLY_SCOPE_DEVICE;
1113                         break;
1114                 case POWER_SUPPLY_PROP_CAPACITY:
1115                         val->intval = battery->battery_capacity;
1116                         break;
1117                 case POWER_SUPPLY_PROP_STATUS:
1118                         if (battery->bat_charging)
1119                                 val->intval = POWER_SUPPLY_STATUS_CHARGING;
1120                         else if (battery->battery_capacity == 100 &&
1121                                     battery->ps_connected)
1122                                 val->intval = POWER_SUPPLY_STATUS_FULL;
1123                         else if (battery->ps_connected)
1124                                 val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING;
1125                         else
1126                                 val->intval = POWER_SUPPLY_STATUS_DISCHARGING;
1127                         break;
1128                 default:
1129                         ret = -EINVAL;
1130                         break;
1131         }
1132
1133         return ret;
1134 }
1135
1136 static int wacom_ac_get_property(struct power_supply *psy,
1137                                 enum power_supply_property psp,
1138                                 union power_supply_propval *val)
1139 {
1140         struct wacom_battery *battery = power_supply_get_drvdata(psy);
1141         int ret = 0;
1142
1143         switch (psp) {
1144         case POWER_SUPPLY_PROP_PRESENT:
1145                 /* fall through */
1146         case POWER_SUPPLY_PROP_ONLINE:
1147                 val->intval = battery->ps_connected;
1148                 break;
1149         case POWER_SUPPLY_PROP_SCOPE:
1150                 val->intval = POWER_SUPPLY_SCOPE_DEVICE;
1151                 break;
1152         default:
1153                 ret = -EINVAL;
1154                 break;
1155         }
1156         return ret;
1157 }
1158
1159 static int __wacom_initialize_battery(struct wacom *wacom,
1160                                       struct wacom_battery *battery)
1161 {
1162         static atomic_t battery_no = ATOMIC_INIT(0);
1163         struct device *dev = &wacom->hdev->dev;
1164         struct power_supply_config psy_cfg = { .drv_data = battery, };
1165         struct power_supply *ps_bat, *ps_ac;
1166         struct power_supply_desc *bat_desc = &battery->bat_desc;
1167         struct power_supply_desc *ac_desc = &battery->ac_desc;
1168         unsigned long n;
1169         int error;
1170
1171         if (!devres_open_group(dev, bat_desc, GFP_KERNEL))
1172                 return -ENOMEM;
1173
1174         n = atomic_inc_return(&battery_no) - 1;
1175
1176         bat_desc->properties = wacom_battery_props;
1177         bat_desc->num_properties = ARRAY_SIZE(wacom_battery_props);
1178         bat_desc->get_property = wacom_battery_get_property;
1179         sprintf(battery->bat_name, "wacom_battery_%ld", n);
1180         bat_desc->name = battery->bat_name;
1181         bat_desc->type = POWER_SUPPLY_TYPE_BATTERY;
1182         bat_desc->use_for_apm = 0;
1183
1184         ac_desc->properties = wacom_ac_props;
1185         ac_desc->num_properties = ARRAY_SIZE(wacom_ac_props);
1186         ac_desc->get_property = wacom_ac_get_property;
1187         sprintf(battery->ac_name, "wacom_ac_%ld", n);
1188         ac_desc->name = battery->ac_name;
1189         ac_desc->type = POWER_SUPPLY_TYPE_MAINS;
1190         ac_desc->use_for_apm = 0;
1191
1192         ps_bat = devm_power_supply_register(dev, bat_desc, &psy_cfg);
1193         if (IS_ERR(ps_bat)) {
1194                 error = PTR_ERR(ps_bat);
1195                 goto err;
1196         }
1197
1198         ps_ac = devm_power_supply_register(dev, ac_desc, &psy_cfg);
1199         if (IS_ERR(ps_ac)) {
1200                 error = PTR_ERR(ps_ac);
1201                 goto err;
1202         }
1203
1204         power_supply_powers(ps_bat, &wacom->hdev->dev);
1205         power_supply_powers(ps_ac, &wacom->hdev->dev);
1206
1207         battery->battery = ps_bat;
1208         battery->ac = ps_ac;
1209
1210         devres_close_group(dev, bat_desc);
1211         return 0;
1212
1213 err:
1214         devres_release_group(dev, bat_desc);
1215         return error;
1216 }
1217
1218 static int wacom_initialize_battery(struct wacom *wacom)
1219 {
1220         if (wacom->wacom_wac.features.quirks & WACOM_QUIRK_BATTERY)
1221                 return __wacom_initialize_battery(wacom, &wacom->battery);
1222
1223         return 0;
1224 }
1225
1226 static void wacom_destroy_battery(struct wacom *wacom)
1227 {
1228         if (wacom->battery.battery) {
1229                 devres_release_group(&wacom->hdev->dev,
1230                                      &wacom->battery.bat_desc);
1231                 wacom->battery.battery = NULL;
1232                 wacom->battery.ac = NULL;
1233         }
1234 }
1235
1236 static ssize_t wacom_show_speed(struct device *dev,
1237                                 struct device_attribute
1238                                 *attr, char *buf)
1239 {
1240         struct hid_device *hdev = to_hid_device(dev);
1241         struct wacom *wacom = hid_get_drvdata(hdev);
1242
1243         return snprintf(buf, PAGE_SIZE, "%i\n", wacom->wacom_wac.bt_high_speed);
1244 }
1245
1246 static ssize_t wacom_store_speed(struct device *dev,
1247                                 struct device_attribute *attr,
1248                                 const char *buf, size_t count)
1249 {
1250         struct hid_device *hdev = to_hid_device(dev);
1251         struct wacom *wacom = hid_get_drvdata(hdev);
1252         u8 new_speed;
1253
1254         if (kstrtou8(buf, 0, &new_speed))
1255                 return -EINVAL;
1256
1257         if (new_speed != 0 && new_speed != 1)
1258                 return -EINVAL;
1259
1260         wacom_bt_query_tablet_data(hdev, new_speed, &wacom->wacom_wac.features);
1261
1262         return count;
1263 }
1264
1265 static DEVICE_ATTR(speed, DEV_ATTR_RW_PERM,
1266                 wacom_show_speed, wacom_store_speed);
1267
1268
1269 static ssize_t wacom_show_remote_mode(struct kobject *kobj,
1270                                       struct kobj_attribute *kattr,
1271                                       char *buf, int index)
1272 {
1273         struct device *dev = kobj_to_dev(kobj->parent);
1274         struct hid_device *hdev = to_hid_device(dev);
1275         struct wacom *wacom = hid_get_drvdata(hdev);
1276         u8 mode;
1277
1278         mode = wacom->led.groups[index].select;
1279         if (mode >= 0 && mode < 3)
1280                 return snprintf(buf, PAGE_SIZE, "%d\n", mode);
1281         else
1282                 return snprintf(buf, PAGE_SIZE, "%d\n", -1);
1283 }
1284
1285 #define DEVICE_EKR_ATTR_GROUP(SET_ID)                                   \
1286 static ssize_t wacom_show_remote##SET_ID##_mode(struct kobject *kobj,   \
1287                                struct kobj_attribute *kattr, char *buf) \
1288 {                                                                       \
1289         return wacom_show_remote_mode(kobj, kattr, buf, SET_ID);        \
1290 }                                                                       \
1291 static struct kobj_attribute remote##SET_ID##_mode_attr = {             \
1292         .attr = {.name = "remote_mode",                                 \
1293                 .mode = DEV_ATTR_RO_PERM},                              \
1294         .show = wacom_show_remote##SET_ID##_mode,                       \
1295 };                                                                      \
1296 static struct attribute *remote##SET_ID##_serial_attrs[] = {            \
1297         &remote##SET_ID##_mode_attr.attr,                               \
1298         NULL                                                            \
1299 };                                                                      \
1300 static struct attribute_group remote##SET_ID##_serial_group = {         \
1301         .name = NULL,                                                   \
1302         .attrs = remote##SET_ID##_serial_attrs,                         \
1303 }
1304
1305 DEVICE_EKR_ATTR_GROUP(0);
1306 DEVICE_EKR_ATTR_GROUP(1);
1307 DEVICE_EKR_ATTR_GROUP(2);
1308 DEVICE_EKR_ATTR_GROUP(3);
1309 DEVICE_EKR_ATTR_GROUP(4);
1310
1311 static int wacom_remote_create_attr_group(struct wacom *wacom, __u32 serial,
1312                                           int index)
1313 {
1314         int error = 0;
1315         struct wacom_remote *remote = wacom->remote;
1316
1317         remote->remotes[index].group.name = devm_kasprintf(&wacom->hdev->dev,
1318                                                           GFP_KERNEL,
1319                                                           "%d", serial);
1320         if (!remote->remotes[index].group.name)
1321                 return -ENOMEM;
1322
1323         error = __wacom_devm_sysfs_create_group(wacom, remote->remote_dir,
1324                                                 &remote->remotes[index].group);
1325         if (error) {
1326                 remote->remotes[index].group.name = NULL;
1327                 hid_err(wacom->hdev,
1328                         "cannot create sysfs group err: %d\n", error);
1329                 return error;
1330         }
1331
1332         return 0;
1333 }
1334
1335 static int wacom_cmd_unpair_remote(struct wacom *wacom, unsigned char selector)
1336 {
1337         const size_t buf_size = 2;
1338         unsigned char *buf;
1339         int retval;
1340
1341         buf = kzalloc(buf_size, GFP_KERNEL);
1342         if (!buf)
1343                 return -ENOMEM;
1344
1345         buf[0] = WAC_CMD_DELETE_PAIRING;
1346         buf[1] = selector;
1347
1348         retval = wacom_set_report(wacom->hdev, HID_OUTPUT_REPORT, buf,
1349                                   buf_size, WAC_CMD_RETRIES);
1350         kfree(buf);
1351
1352         return retval;
1353 }
1354
1355 static ssize_t wacom_store_unpair_remote(struct kobject *kobj,
1356                                          struct kobj_attribute *attr,
1357                                          const char *buf, size_t count)
1358 {
1359         unsigned char selector = 0;
1360         struct device *dev = kobj_to_dev(kobj->parent);
1361         struct hid_device *hdev = to_hid_device(dev);
1362         struct wacom *wacom = hid_get_drvdata(hdev);
1363         int err;
1364
1365         if (!strncmp(buf, "*\n", 2)) {
1366                 selector = WAC_CMD_UNPAIR_ALL;
1367         } else {
1368                 hid_info(wacom->hdev, "remote: unrecognized unpair code: %s\n",
1369                          buf);
1370                 return -1;
1371         }
1372
1373         mutex_lock(&wacom->lock);
1374
1375         err = wacom_cmd_unpair_remote(wacom, selector);
1376         mutex_unlock(&wacom->lock);
1377
1378         return err < 0 ? err : count;
1379 }
1380
1381 static struct kobj_attribute unpair_remote_attr = {
1382         .attr = {.name = "unpair_remote", .mode = 0200},
1383         .store = wacom_store_unpair_remote,
1384 };
1385
1386 static const struct attribute *remote_unpair_attrs[] = {
1387         &unpair_remote_attr.attr,
1388         NULL
1389 };
1390
1391 static void wacom_remotes_destroy(void *data)
1392 {
1393         struct wacom *wacom = data;
1394         struct wacom_remote *remote = wacom->remote;
1395
1396         if (!remote)
1397                 return;
1398
1399         kobject_put(remote->remote_dir);
1400         kfifo_free(&remote->remote_fifo);
1401         wacom->remote = NULL;
1402 }
1403
1404 static int wacom_initialize_remotes(struct wacom *wacom)
1405 {
1406         int error = 0;
1407         struct wacom_remote *remote;
1408         int i;
1409
1410         if (wacom->wacom_wac.features.type != REMOTE)
1411                 return 0;
1412
1413         remote = devm_kzalloc(&wacom->hdev->dev, sizeof(*wacom->remote),
1414                               GFP_KERNEL);
1415         if (!remote)
1416                 return -ENOMEM;
1417
1418         wacom->remote = remote;
1419
1420         spin_lock_init(&remote->remote_lock);
1421
1422         error = kfifo_alloc(&remote->remote_fifo,
1423                         5 * sizeof(struct wacom_remote_data),
1424                         GFP_KERNEL);
1425         if (error) {
1426                 hid_err(wacom->hdev, "failed allocating remote_fifo\n");
1427                 return -ENOMEM;
1428         }
1429
1430         remote->remotes[0].group = remote0_serial_group;
1431         remote->remotes[1].group = remote1_serial_group;
1432         remote->remotes[2].group = remote2_serial_group;
1433         remote->remotes[3].group = remote3_serial_group;
1434         remote->remotes[4].group = remote4_serial_group;
1435
1436         remote->remote_dir = kobject_create_and_add("wacom_remote",
1437                                                     &wacom->hdev->dev.kobj);
1438         if (!remote->remote_dir)
1439                 return -ENOMEM;
1440
1441         error = sysfs_create_files(remote->remote_dir, remote_unpair_attrs);
1442
1443         if (error) {
1444                 hid_err(wacom->hdev,
1445                         "cannot create sysfs group err: %d\n", error);
1446                 return error;
1447         }
1448
1449         for (i = 0; i < WACOM_MAX_REMOTES; i++) {
1450                 wacom->led.groups[i].select = WACOM_STATUS_UNKNOWN;
1451                 remote->remotes[i].serial = 0;
1452         }
1453
1454         error = devm_add_action_or_reset(&wacom->hdev->dev,
1455                                          wacom_remotes_destroy, wacom);
1456         if (error)
1457                 return error;
1458
1459         return 0;
1460 }
1461
1462 static struct input_dev *wacom_allocate_input(struct wacom *wacom)
1463 {
1464         struct input_dev *input_dev;
1465         struct hid_device *hdev = wacom->hdev;
1466         struct wacom_wac *wacom_wac = &(wacom->wacom_wac);
1467
1468         input_dev = devm_input_allocate_device(&hdev->dev);
1469         if (!input_dev)
1470                 return NULL;
1471
1472         input_dev->name = wacom_wac->features.name;
1473         input_dev->phys = hdev->phys;
1474         input_dev->dev.parent = &hdev->dev;
1475         input_dev->open = wacom_open;
1476         input_dev->close = wacom_close;
1477         input_dev->uniq = hdev->uniq;
1478         input_dev->id.bustype = hdev->bus;
1479         input_dev->id.vendor  = hdev->vendor;
1480         input_dev->id.product = wacom_wac->pid ? wacom_wac->pid : hdev->product;
1481         input_dev->id.version = hdev->version;
1482         input_set_drvdata(input_dev, wacom);
1483
1484         return input_dev;
1485 }
1486
1487 static int wacom_allocate_inputs(struct wacom *wacom)
1488 {
1489         struct wacom_wac *wacom_wac = &(wacom->wacom_wac);
1490
1491         wacom_wac->pen_input = wacom_allocate_input(wacom);
1492         wacom_wac->touch_input = wacom_allocate_input(wacom);
1493         wacom_wac->pad_input = wacom_allocate_input(wacom);
1494         if (!wacom_wac->pen_input ||
1495             !wacom_wac->touch_input ||
1496             !wacom_wac->pad_input)
1497                 return -ENOMEM;
1498
1499         wacom_wac->pen_input->name = wacom_wac->pen_name;
1500         wacom_wac->touch_input->name = wacom_wac->touch_name;
1501         wacom_wac->pad_input->name = wacom_wac->pad_name;
1502
1503         return 0;
1504 }
1505
1506 static int wacom_register_inputs(struct wacom *wacom)
1507 {
1508         struct input_dev *pen_input_dev, *touch_input_dev, *pad_input_dev;
1509         struct wacom_wac *wacom_wac = &(wacom->wacom_wac);
1510         int error = 0;
1511
1512         pen_input_dev = wacom_wac->pen_input;
1513         touch_input_dev = wacom_wac->touch_input;
1514         pad_input_dev = wacom_wac->pad_input;
1515
1516         if (!pen_input_dev || !touch_input_dev || !pad_input_dev)
1517                 return -EINVAL;
1518
1519         error = wacom_setup_pen_input_capabilities(pen_input_dev, wacom_wac);
1520         if (error) {
1521                 /* no pen in use on this interface */
1522                 input_free_device(pen_input_dev);
1523                 wacom_wac->pen_input = NULL;
1524                 pen_input_dev = NULL;
1525         } else {
1526                 error = input_register_device(pen_input_dev);
1527                 if (error)
1528                         goto fail;
1529         }
1530
1531         error = wacom_setup_touch_input_capabilities(touch_input_dev, wacom_wac);
1532         if (error) {
1533                 /* no touch in use on this interface */
1534                 input_free_device(touch_input_dev);
1535                 wacom_wac->touch_input = NULL;
1536                 touch_input_dev = NULL;
1537         } else {
1538                 error = input_register_device(touch_input_dev);
1539                 if (error)
1540                         goto fail;
1541         }
1542
1543         error = wacom_setup_pad_input_capabilities(pad_input_dev, wacom_wac);
1544         if (error) {
1545                 /* no pad in use on this interface */
1546                 input_free_device(pad_input_dev);
1547                 wacom_wac->pad_input = NULL;
1548                 pad_input_dev = NULL;
1549         } else {
1550                 error = input_register_device(pad_input_dev);
1551                 if (error)
1552                         goto fail;
1553         }
1554
1555         return 0;
1556
1557 fail:
1558         wacom_wac->pad_input = NULL;
1559         wacom_wac->touch_input = NULL;
1560         wacom_wac->pen_input = NULL;
1561         return error;
1562 }
1563
1564 /*
1565  * Not all devices report physical dimensions from HID.
1566  * Compute the default from hardcoded logical dimension
1567  * and resolution before driver overwrites them.
1568  */
1569 static void wacom_set_default_phy(struct wacom_features *features)
1570 {
1571         if (features->x_resolution) {
1572                 features->x_phy = (features->x_max * 100) /
1573                                         features->x_resolution;
1574                 features->y_phy = (features->y_max * 100) /
1575                                         features->y_resolution;
1576         }
1577 }
1578
1579 static void wacom_calculate_res(struct wacom_features *features)
1580 {
1581         /* set unit to "100th of a mm" for devices not reported by HID */
1582         if (!features->unit) {
1583                 features->unit = 0x11;
1584                 features->unitExpo = -3;
1585         }
1586
1587         features->x_resolution = wacom_calc_hid_res(features->x_max,
1588                                                     features->x_phy,
1589                                                     features->unit,
1590                                                     features->unitExpo);
1591         features->y_resolution = wacom_calc_hid_res(features->y_max,
1592                                                     features->y_phy,
1593                                                     features->unit,
1594                                                     features->unitExpo);
1595 }
1596
1597 void wacom_battery_work(struct work_struct *work)
1598 {
1599         struct wacom *wacom = container_of(work, struct wacom, battery_work);
1600
1601         if ((wacom->wacom_wac.features.quirks & WACOM_QUIRK_BATTERY) &&
1602              !wacom->battery.battery) {
1603                 wacom_initialize_battery(wacom);
1604         }
1605         else if (!(wacom->wacom_wac.features.quirks & WACOM_QUIRK_BATTERY) &&
1606                  wacom->battery.battery) {
1607                 wacom_destroy_battery(wacom);
1608         }
1609 }
1610
1611 static size_t wacom_compute_pktlen(struct hid_device *hdev)
1612 {
1613         struct hid_report_enum *report_enum;
1614         struct hid_report *report;
1615         size_t size = 0;
1616
1617         report_enum = hdev->report_enum + HID_INPUT_REPORT;
1618
1619         list_for_each_entry(report, &report_enum->report_list, list) {
1620                 size_t report_size = hid_report_len(report);
1621                 if (report_size > size)
1622                         size = report_size;
1623         }
1624
1625         return size;
1626 }
1627
1628 static void wacom_update_name(struct wacom *wacom, const char *suffix)
1629 {
1630         struct wacom_wac *wacom_wac = &wacom->wacom_wac;
1631         struct wacom_features *features = &wacom_wac->features;
1632         char name[WACOM_NAME_MAX];
1633
1634         /* Generic devices name unspecified */
1635         if ((features->type == HID_GENERIC) && !strcmp("Wacom HID", features->name)) {
1636                 if (strstr(wacom->hdev->name, "Wacom") ||
1637                     strstr(wacom->hdev->name, "wacom") ||
1638                     strstr(wacom->hdev->name, "WACOM")) {
1639                         /* name is in HID descriptor, use it */
1640                         strlcpy(name, wacom->hdev->name, sizeof(name));
1641
1642                         /* strip out excess whitespaces */
1643                         while (1) {
1644                                 char *gap = strstr(name, "  ");
1645                                 if (gap == NULL)
1646                                         break;
1647                                 /* shift everything including the terminator */
1648                                 memmove(gap, gap+1, strlen(gap));
1649                         }
1650                         /* get rid of trailing whitespace */
1651                         if (name[strlen(name)-1] == ' ')
1652                                 name[strlen(name)-1] = '\0';
1653                 } else {
1654                         /* no meaningful name retrieved. use product ID */
1655                         snprintf(name, sizeof(name),
1656                                  "%s %X", features->name, wacom->hdev->product);
1657                 }
1658         } else {
1659                 strlcpy(name, features->name, sizeof(name));
1660         }
1661
1662         /* Append the device type to the name */
1663         snprintf(wacom_wac->pen_name, sizeof(wacom_wac->pen_name),
1664                 "%s%s Pen", name, suffix);
1665         snprintf(wacom_wac->touch_name, sizeof(wacom_wac->touch_name),
1666                 "%s%s Finger", name, suffix);
1667         snprintf(wacom_wac->pad_name, sizeof(wacom_wac->pad_name),
1668                 "%s%s Pad", name, suffix);
1669 }
1670
1671 static void wacom_release_resources(struct wacom *wacom)
1672 {
1673         struct hid_device *hdev = wacom->hdev;
1674
1675         if (!wacom->resources)
1676                 return;
1677
1678         devres_release_group(&hdev->dev, wacom);
1679
1680         wacom->resources = false;
1681
1682         wacom->wacom_wac.pen_input = NULL;
1683         wacom->wacom_wac.touch_input = NULL;
1684         wacom->wacom_wac.pad_input = NULL;
1685 }
1686
1687 static int wacom_parse_and_register(struct wacom *wacom, bool wireless)
1688 {
1689         struct wacom_wac *wacom_wac = &wacom->wacom_wac;
1690         struct wacom_features *features = &wacom_wac->features;
1691         struct hid_device *hdev = wacom->hdev;
1692         int error;
1693         unsigned int connect_mask = HID_CONNECT_HIDRAW;
1694
1695         features->pktlen = wacom_compute_pktlen(hdev);
1696         if (features->pktlen > WACOM_PKGLEN_MAX)
1697                 return -EINVAL;
1698
1699         if (!devres_open_group(&hdev->dev, wacom, GFP_KERNEL))
1700                 return -ENOMEM;
1701
1702         wacom->resources = true;
1703
1704         error = wacom_allocate_inputs(wacom);
1705         if (error)
1706                 goto fail;
1707
1708         /*
1709          * Bamboo Pad has a generic hid handling for the Pen, and we switch it
1710          * into debug mode for the touch part.
1711          * We ignore the other interfaces.
1712          */
1713         if (features->type == BAMBOO_PAD) {
1714                 if (features->pktlen == WACOM_PKGLEN_PENABLED) {
1715                         features->type = HID_GENERIC;
1716                 } else if ((features->pktlen != WACOM_PKGLEN_BPAD_TOUCH) &&
1717                            (features->pktlen != WACOM_PKGLEN_BPAD_TOUCH_USB)) {
1718                         error = -ENODEV;
1719                         goto fail;
1720                 }
1721         }
1722
1723         /* set the default size in case we do not get them from hid */
1724         wacom_set_default_phy(features);
1725
1726         /* Retrieve the physical and logical size for touch devices */
1727         wacom_retrieve_hid_descriptor(hdev, features);
1728         wacom_setup_device_quirks(wacom);
1729
1730         if (features->device_type == WACOM_DEVICETYPE_NONE &&
1731             features->type != WIRELESS) {
1732                 error = features->type == HID_GENERIC ? -ENODEV : 0;
1733
1734                 dev_warn(&hdev->dev, "Unknown device_type for '%s'. %s.",
1735                          hdev->name,
1736                          error ? "Ignoring" : "Assuming pen");
1737
1738                 if (error)
1739                         goto fail;
1740
1741                 features->device_type |= WACOM_DEVICETYPE_PEN;
1742         }
1743
1744         wacom_calculate_res(features);
1745
1746         wacom_update_name(wacom, wireless ? " (WL)" : "");
1747
1748         error = wacom_add_shared_data(hdev);
1749         if (error)
1750                 goto fail;
1751
1752         if (!(features->device_type & WACOM_DEVICETYPE_WL_MONITOR) &&
1753              (features->quirks & WACOM_QUIRK_BATTERY)) {
1754                 error = wacom_initialize_battery(wacom);
1755                 if (error)
1756                         goto fail;
1757         }
1758
1759         error = wacom_register_inputs(wacom);
1760         if (error)
1761                 goto fail;
1762
1763         if (wacom->wacom_wac.features.device_type & WACOM_DEVICETYPE_PAD) {
1764                 error = wacom_initialize_leds(wacom);
1765                 if (error)
1766                         goto fail;
1767
1768                 error = wacom_initialize_remotes(wacom);
1769                 if (error)
1770                         goto fail;
1771         }
1772
1773         if (features->type == HID_GENERIC)
1774                 connect_mask |= HID_CONNECT_DRIVER;
1775
1776         /* Regular HID work starts now */
1777         error = hid_hw_start(hdev, connect_mask);
1778         if (error) {
1779                 hid_err(hdev, "hw start failed\n");
1780                 goto fail;
1781         }
1782
1783         if (!wireless) {
1784                 /* Note that if query fails it is not a hard failure */
1785                 wacom_query_tablet_data(hdev, features);
1786         }
1787
1788         /* touch only Bamboo doesn't support pen */
1789         if ((features->type == BAMBOO_TOUCH) &&
1790             (features->device_type & WACOM_DEVICETYPE_PEN)) {
1791                 error = -ENODEV;
1792                 goto fail_quirks;
1793         }
1794
1795         /* pen only Bamboo neither support touch nor pad */
1796         if ((features->type == BAMBOO_PEN) &&
1797             ((features->device_type & WACOM_DEVICETYPE_TOUCH) ||
1798             (features->device_type & WACOM_DEVICETYPE_PAD))) {
1799                 error = -ENODEV;
1800                 goto fail_quirks;
1801         }
1802
1803         if (features->device_type & WACOM_DEVICETYPE_WL_MONITOR)
1804                 error = hid_hw_open(hdev);
1805
1806         if ((wacom_wac->features.type == INTUOSHT ||
1807              wacom_wac->features.type == INTUOSHT2) &&
1808             (wacom_wac->features.device_type & WACOM_DEVICETYPE_TOUCH)) {
1809                 wacom_wac->shared->type = wacom_wac->features.type;
1810                 wacom_wac->shared->touch_input = wacom_wac->touch_input;
1811         }
1812
1813         devres_close_group(&hdev->dev, wacom);
1814
1815         return 0;
1816
1817 fail_quirks:
1818         hid_hw_stop(hdev);
1819 fail:
1820         wacom_release_resources(wacom);
1821         return error;
1822 }
1823
1824 static void wacom_wireless_work(struct work_struct *work)
1825 {
1826         struct wacom *wacom = container_of(work, struct wacom, wireless_work);
1827         struct usb_device *usbdev = wacom->usbdev;
1828         struct wacom_wac *wacom_wac = &wacom->wacom_wac;
1829         struct hid_device *hdev1, *hdev2;
1830         struct wacom *wacom1, *wacom2;
1831         struct wacom_wac *wacom_wac1, *wacom_wac2;
1832         int error;
1833
1834         /*
1835          * Regardless if this is a disconnect or a new tablet,
1836          * remove any existing input and battery devices.
1837          */
1838
1839         wacom_destroy_battery(wacom);
1840
1841         /* Stylus interface */
1842         hdev1 = usb_get_intfdata(usbdev->config->interface[1]);
1843         wacom1 = hid_get_drvdata(hdev1);
1844         wacom_wac1 = &(wacom1->wacom_wac);
1845         wacom_release_resources(wacom1);
1846
1847         /* Touch interface */
1848         hdev2 = usb_get_intfdata(usbdev->config->interface[2]);
1849         wacom2 = hid_get_drvdata(hdev2);
1850         wacom_wac2 = &(wacom2->wacom_wac);
1851         wacom_release_resources(wacom2);
1852
1853         if (wacom_wac->pid == 0) {
1854                 hid_info(wacom->hdev, "wireless tablet disconnected\n");
1855         } else {
1856                 const struct hid_device_id *id = wacom_ids;
1857
1858                 hid_info(wacom->hdev, "wireless tablet connected with PID %x\n",
1859                          wacom_wac->pid);
1860
1861                 while (id->bus) {
1862                         if (id->vendor == USB_VENDOR_ID_WACOM &&
1863                             id->product == wacom_wac->pid)
1864                                 break;
1865                         id++;
1866                 }
1867
1868                 if (!id->bus) {
1869                         hid_info(wacom->hdev, "ignoring unknown PID.\n");
1870                         return;
1871                 }
1872
1873                 /* Stylus interface */
1874                 wacom_wac1->features =
1875                         *((struct wacom_features *)id->driver_data);
1876
1877                 wacom_wac1->pid = wacom_wac->pid;
1878                 hid_hw_stop(hdev1);
1879                 error = wacom_parse_and_register(wacom1, true);
1880                 if (error)
1881                         goto fail;
1882
1883                 /* Touch interface */
1884                 if (wacom_wac1->features.touch_max ||
1885                     (wacom_wac1->features.type >= INTUOSHT &&
1886                     wacom_wac1->features.type <= BAMBOO_PT)) {
1887                         wacom_wac2->features =
1888                                 *((struct wacom_features *)id->driver_data);
1889                         wacom_wac2->pid = wacom_wac->pid;
1890                         hid_hw_stop(hdev2);
1891                         error = wacom_parse_and_register(wacom2, true);
1892                         if (error)
1893                                 goto fail;
1894                 }
1895
1896                 error = wacom_initialize_battery(wacom);
1897                 if (error)
1898                         goto fail;
1899         }
1900
1901         return;
1902
1903 fail:
1904         wacom_release_resources(wacom1);
1905         wacom_release_resources(wacom2);
1906         return;
1907 }
1908
1909 static void wacom_remote_destroy_one(struct wacom *wacom, unsigned int index)
1910 {
1911         struct wacom_remote *remote = wacom->remote;
1912         u32 serial = remote->remotes[index].serial;
1913         int i;
1914         unsigned long flags;
1915
1916         spin_lock_irqsave(&remote->remote_lock, flags);
1917         remote->remotes[index].registered = false;
1918         spin_unlock_irqrestore(&remote->remote_lock, flags);
1919
1920         if (remote->remotes[index].group.name)
1921                 devres_release_group(&wacom->hdev->dev,
1922                                      &remote->remotes[index]);
1923
1924         for (i = 0; i < WACOM_MAX_REMOTES; i++) {
1925                 if (remote->remotes[i].serial == serial) {
1926                         remote->remotes[i].serial = 0;
1927                         remote->remotes[i].group.name = NULL;
1928                         remote->remotes[i].registered = false;
1929                         wacom->led.groups[i].select = WACOM_STATUS_UNKNOWN;
1930                 }
1931         }
1932 }
1933
1934 static int wacom_remote_create_one(struct wacom *wacom, u32 serial,
1935                                    unsigned int index)
1936 {
1937         struct wacom_remote *remote = wacom->remote;
1938         struct device *dev = &wacom->hdev->dev;
1939         int error, k;
1940
1941         /* A remote can pair more than once with an EKR,
1942          * check to make sure this serial isn't already paired.
1943          */
1944         for (k = 0; k < WACOM_MAX_REMOTES; k++) {
1945                 if (remote->remotes[k].serial == serial)
1946                         break;
1947         }
1948
1949         if (k < WACOM_MAX_REMOTES) {
1950                 remote->remotes[index].serial = serial;
1951                 return 0;
1952         }
1953
1954         if (!devres_open_group(dev, &remote->remotes[index], GFP_KERNEL))
1955                 return -ENOMEM;
1956
1957         error = wacom_remote_create_attr_group(wacom, serial, index);
1958         if (error)
1959                 goto fail;
1960
1961         remote->remotes[index].input = wacom_allocate_input(wacom);
1962         if (!remote->remotes[index].input) {
1963                 error = -ENOMEM;
1964                 goto fail;
1965         }
1966         remote->remotes[index].input->uniq = remote->remotes[index].group.name;
1967         remote->remotes[index].input->name = wacom->wacom_wac.pad_name;
1968
1969         if (!remote->remotes[index].input->name) {
1970                 error = -EINVAL;
1971                 goto fail;
1972         }
1973
1974         error = wacom_setup_pad_input_capabilities(remote->remotes[index].input,
1975                                                    &wacom->wacom_wac);
1976         if (error)
1977                 goto fail;
1978
1979         remote->remotes[index].serial = serial;
1980
1981         error = input_register_device(remote->remotes[index].input);
1982         if (error)
1983                 goto fail;
1984
1985         error = __wacom_initialize_battery(wacom,
1986                                            &remote->remotes[index].battery);
1987         if (error)
1988                 goto fail;
1989
1990         remote->remotes[index].registered = true;
1991
1992         devres_close_group(dev, &remote->remotes[index]);
1993         return 0;
1994
1995 fail:
1996         devres_release_group(dev, &remote->remotes[index]);
1997         remote->remotes[index].serial = 0;
1998         return error;
1999 }
2000
2001 static void wacom_remote_work(struct work_struct *work)
2002 {
2003         struct wacom *wacom = container_of(work, struct wacom, remote_work);
2004         struct wacom_remote *remote = wacom->remote;
2005         struct wacom_remote_data data;
2006         unsigned long flags;
2007         unsigned int count;
2008         u32 serial;
2009         int i;
2010
2011         spin_lock_irqsave(&remote->remote_lock, flags);
2012
2013         count = kfifo_out(&remote->remote_fifo, &data, sizeof(data));
2014
2015         if (count != sizeof(data)) {
2016                 hid_err(wacom->hdev,
2017                         "workitem triggered without status available\n");
2018                 spin_unlock_irqrestore(&remote->remote_lock, flags);
2019                 return;
2020         }
2021
2022         if (!kfifo_is_empty(&remote->remote_fifo))
2023                 wacom_schedule_work(&wacom->wacom_wac, WACOM_WORKER_REMOTE);
2024
2025         spin_unlock_irqrestore(&remote->remote_lock, flags);
2026
2027         for (i = 0; i < WACOM_MAX_REMOTES; i++) {
2028                 serial = data.remote[i].serial;
2029                 if (data.remote[i].connected) {
2030
2031                         if (remote->remotes[i].serial == serial)
2032                                 continue;
2033
2034                         if (remote->remotes[i].serial)
2035                                 wacom_remote_destroy_one(wacom, i);
2036
2037                         wacom_remote_create_one(wacom, serial, i);
2038
2039                 } else if (remote->remotes[i].serial) {
2040                         wacom_remote_destroy_one(wacom, i);
2041                 }
2042         }
2043 }
2044
2045 static int wacom_probe(struct hid_device *hdev,
2046                 const struct hid_device_id *id)
2047 {
2048         struct usb_interface *intf = to_usb_interface(hdev->dev.parent);
2049         struct usb_device *dev = interface_to_usbdev(intf);
2050         struct wacom *wacom;
2051         struct wacom_wac *wacom_wac;
2052         struct wacom_features *features;
2053         int error;
2054
2055         if (!id->driver_data)
2056                 return -EINVAL;
2057
2058         hdev->quirks |= HID_QUIRK_NO_INIT_REPORTS;
2059
2060         /* hid-core sets this quirk for the boot interface */
2061         hdev->quirks &= ~HID_QUIRK_NOGET;
2062
2063         wacom = devm_kzalloc(&hdev->dev, sizeof(struct wacom), GFP_KERNEL);
2064         if (!wacom)
2065                 return -ENOMEM;
2066
2067         hid_set_drvdata(hdev, wacom);
2068         wacom->hdev = hdev;
2069
2070         wacom_wac = &wacom->wacom_wac;
2071         wacom_wac->features = *((struct wacom_features *)id->driver_data);
2072         features = &wacom_wac->features;
2073
2074         if (features->check_for_hid_type && features->hid_type != hdev->type) {
2075                 error = -ENODEV;
2076                 goto fail;
2077         }
2078
2079         wacom_wac->hid_data.inputmode = -1;
2080         wacom_wac->mode_report = -1;
2081
2082         wacom->usbdev = dev;
2083         wacom->intf = intf;
2084         mutex_init(&wacom->lock);
2085         INIT_WORK(&wacom->wireless_work, wacom_wireless_work);
2086         INIT_WORK(&wacom->battery_work, wacom_battery_work);
2087         INIT_WORK(&wacom->remote_work, wacom_remote_work);
2088
2089         /* ask for the report descriptor to be loaded by HID */
2090         error = hid_parse(hdev);
2091         if (error) {
2092                 hid_err(hdev, "parse failed\n");
2093                 goto fail;
2094         }
2095
2096         error = wacom_parse_and_register(wacom, false);
2097         if (error)
2098                 goto fail;
2099
2100         if (hdev->bus == BUS_BLUETOOTH) {
2101                 error = device_create_file(&hdev->dev, &dev_attr_speed);
2102                 if (error)
2103                         hid_warn(hdev,
2104                                  "can't create sysfs speed attribute err: %d\n",
2105                                  error);
2106         }
2107
2108         return 0;
2109
2110 fail:
2111         hid_set_drvdata(hdev, NULL);
2112         return error;
2113 }
2114
2115 static void wacom_remove(struct hid_device *hdev)
2116 {
2117         struct wacom *wacom = hid_get_drvdata(hdev);
2118         struct wacom_wac *wacom_wac = &wacom->wacom_wac;
2119         struct wacom_features *features = &wacom_wac->features;
2120
2121         if (features->device_type & WACOM_DEVICETYPE_WL_MONITOR)
2122                 hid_hw_close(hdev);
2123
2124         hid_hw_stop(hdev);
2125
2126         cancel_work_sync(&wacom->wireless_work);
2127         cancel_work_sync(&wacom->battery_work);
2128         cancel_work_sync(&wacom->remote_work);
2129         if (hdev->bus == BUS_BLUETOOTH)
2130                 device_remove_file(&hdev->dev, &dev_attr_speed);
2131
2132         hid_set_drvdata(hdev, NULL);
2133 }
2134
2135 #ifdef CONFIG_PM
2136 static int wacom_resume(struct hid_device *hdev)
2137 {
2138         struct wacom *wacom = hid_get_drvdata(hdev);
2139         struct wacom_features *features = &wacom->wacom_wac.features;
2140
2141         mutex_lock(&wacom->lock);
2142
2143         /* switch to wacom mode first */
2144         wacom_query_tablet_data(hdev, features);
2145         wacom_led_control(wacom);
2146
2147         mutex_unlock(&wacom->lock);
2148
2149         return 0;
2150 }
2151
2152 static int wacom_reset_resume(struct hid_device *hdev)
2153 {
2154         return wacom_resume(hdev);
2155 }
2156 #endif /* CONFIG_PM */
2157
2158 static struct hid_driver wacom_driver = {
2159         .name =         "wacom",
2160         .id_table =     wacom_ids,
2161         .probe =        wacom_probe,
2162         .remove =       wacom_remove,
2163         .report =       wacom_wac_report,
2164 #ifdef CONFIG_PM
2165         .resume =       wacom_resume,
2166         .reset_resume = wacom_reset_resume,
2167 #endif
2168         .raw_event =    wacom_raw_event,
2169 };
2170 module_hid_driver(wacom_driver);
2171
2172 MODULE_VERSION(DRIVER_VERSION);
2173 MODULE_AUTHOR(DRIVER_AUTHOR);
2174 MODULE_DESCRIPTION(DRIVER_DESC);
2175 MODULE_LICENSE(DRIVER_LICENSE);