drivers/input/tablet/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
  17 /* defines to get HID report descriptor */
  18 #define HID_DEVICET_HID         (USB_TYPE_CLASS | 0x01)
  19 #define HID_DEVICET_REPORT      (USB_TYPE_CLASS | 0x02)
  20 #define HID_USAGE_UNDEFINED             0x00
  21 #define HID_USAGE_PAGE                  0x05
  22 #define HID_USAGE_PAGE_DIGITIZER        0x0d
  23 #define HID_USAGE_PAGE_DESKTOP          0x01
  24 #define HID_USAGE                       0x09
  25 #define HID_USAGE_X                     0x30
  26 #define HID_USAGE_Y                     0x31
  27 #define HID_USAGE_X_TILT                0x3d
  28 #define HID_USAGE_Y_TILT                0x3e
  29 #define HID_USAGE_FINGER                0x22
  30 #define HID_USAGE_STYLUS                0x20
  31 #define HID_USAGE_CONTACTMAX            0x55
  32 #define HID_COLLECTION                  0xa1
  33 #define HID_COLLECTION_LOGICAL          0x02
  34 #define HID_COLLECTION_END              0xc0
  35
  36 enum {
  37         WCM_UNDEFINED = 0,
  38         WCM_DESKTOP,
  39         WCM_DIGITIZER,
  40 };
  41
  42 struct hid_descriptor {
  43         struct usb_descriptor_header header;
  44         __le16   bcdHID;
  45         u8       bCountryCode;
  46         u8       bNumDescriptors;
  47         u8       bDescriptorType;
  48         __le16   wDescriptorLength;
  49 } __attribute__ ((packed));
  50
  51 /* defines to get/set USB message */
  52 #define USB_REQ_GET_REPORT      0x01
  53 #define USB_REQ_SET_REPORT      0x09
  54
  55 #define WAC_HID_FEATURE_REPORT  0x03
  56 #define WAC_MSG_RETRIES         5
  57
  58 #define WAC_CMD_LED_CONTROL     0x20
  59 #define WAC_CMD_ICON_START      0x21
  60 #define WAC_CMD_ICON_XFER       0x23
  61 #define WAC_CMD_RETRIES         10
  62
  63 static int wacom_get_report(struct usb_interface *intf, u8 type, u8 id,
  64                             void *buf, size_t size, unsigned int retries)
  65 {
  66         struct usb_device *dev = interface_to_usbdev(intf);
  67         int retval;
  68
  69         do {
  70                 retval = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0),
  71                                 USB_REQ_GET_REPORT,
  72                                 USB_DIR_IN | USB_TYPE_CLASS |
  73                                 USB_RECIP_INTERFACE,
  74                                 (type << 8) + id,
  75                                 intf->altsetting[0].desc.bInterfaceNumber,
  76                                 buf, size, 100);
  77         } while ((retval == -ETIMEDOUT || retval == -EPIPE) && --retries);
  78
  79         return retval;
  80 }
  81
  82 static int wacom_set_report(struct usb_interface *intf, u8 type, u8 id,
  83                             void *buf, size_t size, unsigned int retries)
  84 {
  85         struct usb_device *dev = interface_to_usbdev(intf);
  86         int retval;
  87
  88         do {
  89                 retval = usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
  90                                 USB_REQ_SET_REPORT,
  91                                 USB_TYPE_CLASS | USB_RECIP_INTERFACE,
  92                                 (type << 8) + id,
  93                                 intf->altsetting[0].desc.bInterfaceNumber,
  94                                 buf, size, 1000);
  95         } while ((retval == -ETIMEDOUT || retval == -EPIPE) && --retries);
  96
  97         return retval;
  98 }
  99
 100 static void wacom_sys_irq(struct urb *urb)
 101 {
 102         struct wacom *wacom = urb->context;
 103         struct device *dev = &wacom->intf->dev;
 104         int retval;
 105
 106         switch (urb->status) {
 107         case 0:
 108                 /* success */
 109                 break;
 110         case -ECONNRESET:
 111         case -ENOENT:
 112         case -ESHUTDOWN:
 113                 /* this urb is terminated, clean up */
 114                 dev_dbg(dev, "%s - urb shutting down with status: %d\n",
 115                         __func__, urb->status);
 116                 return;
 117         default:
 118                 dev_dbg(dev, "%s - nonzero urb status received: %d\n",
 119                         __func__, urb->status);
 120                 goto exit;
 121         }
 122
 123         wacom_wac_irq(&wacom->wacom_wac, urb->actual_length);
 124
 125  exit:
 126         usb_mark_last_busy(wacom->usbdev);
 127         retval = usb_submit_urb(urb, GFP_ATOMIC);
 128         if (retval)
 129                 dev_err(dev, "%s - usb_submit_urb failed with result %d\n",
 130                         __func__, retval);
 131 }
 132
 133 static int wacom_open(struct input_dev *dev)
 134 {
 135         struct wacom *wacom = input_get_drvdata(dev);
 136         int retval = 0;
 137
 138         if (usb_autopm_get_interface(wacom->intf) < 0)
 139                 return -EIO;
 140
 141         mutex_lock(&wacom->lock);
 142
 143         if (usb_submit_urb(wacom->irq, GFP_KERNEL)) {
 144                 retval = -EIO;
 145                 goto out;
 146         }
 147
 148         wacom->open = true;
 149         wacom->intf->needs_remote_wakeup = 1;
 150
 151 out:
 152         mutex_unlock(&wacom->lock);
 153         usb_autopm_put_interface(wacom->intf);
 154         return retval;
 155 }
 156
 157 static void wacom_close(struct input_dev *dev)
 158 {
 159         struct wacom *wacom = input_get_drvdata(dev);
 160         int autopm_error;
 161
 162         autopm_error = usb_autopm_get_interface(wacom->intf);
 163
 164         mutex_lock(&wacom->lock);
 165         usb_kill_urb(wacom->irq);
 166         wacom->open = false;
 167         wacom->intf->needs_remote_wakeup = 0;
 168         mutex_unlock(&wacom->lock);
 169
 170         if (!autopm_error)
 171                 usb_autopm_put_interface(wacom->intf);
 172 }
 173
 174 /*
 175  * Calculate the resolution of the X or Y axis, given appropriate HID data.
 176  * This function is little more than hidinput_calc_abs_res stripped down.
 177  */
 178 static int wacom_calc_hid_res(int logical_extents, int physical_extents,
 179                               unsigned char unit, unsigned char exponent)
 180 {
 181         int prev, unit_exponent;
 182
 183         /* Check if the extents are sane */
 184         if (logical_extents <= 0 || physical_extents <= 0)
 185                 return 0;
 186
 187         /* Get signed value of nybble-sized twos-compliment exponent */
 188         unit_exponent = exponent;
 189         if (unit_exponent > 7)
 190                 unit_exponent -= 16;
 191
 192         /* Convert physical_extents to millimeters */
 193         if (unit == 0x11) {             /* If centimeters */
 194                 unit_exponent += 1;
 195         } else if (unit == 0x13) {      /* If inches */
 196                 prev = physical_extents;
 197                 physical_extents *= 254;
 198                 if (physical_extents < prev)
 199                         return 0;
 200                 unit_exponent -= 1;
 201         } else {
 202                 return 0;
 203         }
 204
 205         /* Apply negative unit exponent */
 206         for (; unit_exponent < 0; unit_exponent++) {
 207                 prev = logical_extents;
 208                 logical_extents *= 10;
 209                 if (logical_extents < prev)
 210                         return 0;
 211         }
 212         /* Apply positive unit exponent */
 213         for (; unit_exponent > 0; unit_exponent--) {
 214                 prev = physical_extents;
 215                 physical_extents *= 10;
 216                 if (physical_extents < prev)
 217                         return 0;
 218         }
 219
 220         /* Calculate resolution */
 221         return logical_extents / physical_extents;
 222 }
 223
 224 /*
 225  * The physical dimension specified by the HID descriptor is likely not in
 226  * the "100th of a mm" units expected by wacom_calculate_touch_res. This
 227  * function adjusts the value of [xy]_phy based on the unit and exponent
 228  * provided by the HID descriptor. If an error occurs durring conversion
 229  * (e.g. from the unit being left unspecified) [xy]_phy is not modified.
 230  */
 231 static void wacom_fix_phy_from_hid(struct wacom_features *features)
 232 {
 233         int xres = wacom_calc_hid_res(features->x_max, features->x_phy,
 234                                         features->unit, features->unitExpo);
 235         int yres = wacom_calc_hid_res(features->y_max, features->y_phy,
 236                                         features->unit, features->unitExpo);
 237
 238         if (xres > 0 && yres > 0) {
 239                 features->x_phy = (100 * features->x_max) / xres;
 240                 features->y_phy = (100 * features->y_max) / yres;
 241         }
 242 }
 243
 244 /*
 245  * Static values for max X/Y and resolution of Pen interface is stored in
 246  * features. This mean physical size of active area can be computed.
 247  * This is useful to do when Pen and Touch have same active area of tablet.
 248  * This means for Touch device, we only need to find max X/Y value and we
 249  * have enough information to compute resolution of touch.
 250  */
 251 static void wacom_set_phy_from_res(struct wacom_features *features)
 252 {
 253         features->x_phy = (features->x_max * 100) / features->x_resolution;
 254         features->y_phy = (features->y_max * 100) / features->y_resolution;
 255 }
 256
 257 static int wacom_parse_logical_collection(unsigned char *report,
 258                                           struct wacom_features *features)
 259 {
 260         int length = 0;
 261
 262         if (features->type == BAMBOO_PT) {
 263
 264                 /* Logical collection is only used by 3rd gen Bamboo Touch */
 265                 features->pktlen = WACOM_PKGLEN_BBTOUCH3;
 266                 features->device_type = BTN_TOOL_FINGER;
 267
 268                 wacom_set_phy_from_res(features);
 269
 270                 features->x_max = features->y_max =
 271                         get_unaligned_le16(&report[10]);
 272
 273                 length = 11;
 274         }
 275         return length;
 276 }
 277
 278 static void wacom_retrieve_report_data(struct usb_interface *intf,
 279                                        struct wacom_features *features)
 280 {
 281         int result = 0;
 282         unsigned char *rep_data;
 283
 284         rep_data = kmalloc(2, GFP_KERNEL);
 285         if (rep_data) {
 286
 287                 rep_data[0] = 12;
 288                 result = wacom_get_report(intf, WAC_HID_FEATURE_REPORT,
 289                                           rep_data[0], rep_data, 2,
 290                                           WAC_MSG_RETRIES);
 291
 292                 if (result >= 0 && rep_data[1] > 2)
 293                         features->touch_max = rep_data[1];
 294
 295                 kfree(rep_data);
 296         }
 297 }
 298
 299 /*
 300  * Interface Descriptor of wacom devices can be incomplete and
 301  * inconsistent so wacom_features table is used to store stylus
 302  * device's packet lengths, various maximum values, and tablet
 303  * resolution based on product ID's.
 304  *
 305  * For devices that contain 2 interfaces, wacom_features table is
 306  * inaccurate for the touch interface.  Since the Interface Descriptor
 307  * for touch interfaces has pretty complete data, this function exists
 308  * to query tablet for this missing information instead of hard coding in
 309  * an additional table.
 310  *
 311  * A typical Interface Descriptor for a stylus will contain a
 312  * boot mouse application collection that is not of interest and this
 313  * function will ignore it.
 314  *
 315  * It also contains a digitizer application collection that also is not
 316  * of interest since any information it contains would be duplicate
 317  * of what is in wacom_features. Usually it defines a report of an array
 318  * of bytes that could be used as max length of the stylus packet returned.
 319  * If it happens to define a Digitizer-Stylus Physical Collection then
 320  * the X and Y logical values contain valid data but it is ignored.
 321  *
 322  * A typical Interface Descriptor for a touch interface will contain a
 323  * Digitizer-Finger Physical Collection which will define both logical
 324  * X/Y maximum as well as the physical size of tablet. Since touch
 325  * interfaces haven't supported pressure or distance, this is enough
 326  * information to override invalid values in the wacom_features table.
 327  *
 328  * 3rd gen Bamboo Touch no longer define a Digitizer-Finger Pysical
 329  * Collection. Instead they define a Logical Collection with a single
 330  * Logical Maximum for both X and Y.
 331  *
 332  * Intuos5 touch interface does not contain useful data. We deal with
 333  * this after returning from this function.
 334  */
 335 static int wacom_parse_hid(struct usb_interface *intf,
 336                            struct hid_descriptor *hid_desc,
 337                            struct wacom_features *features)
 338 {
 339         struct usb_device *dev = interface_to_usbdev(intf);
 340         char limit = 0;
 341         /* result has to be defined as int for some devices */
 342         int result = 0;
 343         int i = 0, usage = WCM_UNDEFINED, finger = 0, pen = 0;
 344         unsigned char *report;
 345
 346         report = kzalloc(hid_desc->wDescriptorLength, GFP_KERNEL);
 347         if (!report)
 348                 return -ENOMEM;
 349
 350         /* retrive report descriptors */
 351         do {
 352                 result = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0),
 353                         USB_REQ_GET_DESCRIPTOR,
 354                         USB_RECIP_INTERFACE | USB_DIR_IN,
 355                         HID_DEVICET_REPORT << 8,
 356                         intf->altsetting[0].desc.bInterfaceNumber, /* interface */
 357                         report,
 358                         hid_desc->wDescriptorLength,
 359                         5000); /* 5 secs */
 360         } while (result < 0 && limit++ < WAC_MSG_RETRIES);
 361
 362         /* No need to parse the Descriptor. It isn't an error though */
 363         if (result < 0)
 364                 goto out;
 365
 366         for (i = 0; i < hid_desc->wDescriptorLength; i++) {
 367
 368                 switch (report[i]) {
 369                 case HID_USAGE_PAGE:
 370                         switch (report[i + 1]) {
 371                         case HID_USAGE_PAGE_DIGITIZER:
 372                                 usage = WCM_DIGITIZER;
 373                                 i++;
 374                                 break;
 375
 376                         case HID_USAGE_PAGE_DESKTOP:
 377                                 usage = WCM_DESKTOP;
 378                                 i++;
 379                                 break;
 380                         }
 381                         break;
 382
 383                 case HID_USAGE:
 384                         switch (report[i + 1]) {
 385                         case HID_USAGE_X:
 386                                 if (usage == WCM_DESKTOP) {
 387                                         if (finger) {
 388                                                 features->device_type = BTN_TOOL_FINGER;
 389
 390                                                 switch (features->type) {
 391                                                 case TABLETPC2FG:
 392                                                         features->pktlen = WACOM_PKGLEN_TPC2FG;
 393                                                         break;
 394
 395                                                 case MTSCREEN:
 396                                                 case WACOM_24HDT:
 397                                                         features->pktlen = WACOM_PKGLEN_MTOUCH;
 398                                                         break;
 399
 400                                                 case MTTPC:
 401                                                         features->pktlen = WACOM_PKGLEN_MTTPC;
 402                                                         break;
 403
 404                                                 case BAMBOO_PT:
 405                                                         features->pktlen = WACOM_PKGLEN_BBTOUCH;
 406                                                         break;
 407
 408                                                 default:
 409                                                         features->pktlen = WACOM_PKGLEN_GRAPHIRE;
 410                                                         break;
 411                                                 }
 412
 413                                                 switch (features->type) {
 414                                                 case BAMBOO_PT:
 415                                                         features->x_phy =
 416                                                                 get_unaligned_le16(&report[i + 5]);
 417                                                         features->x_max =
 418                                                                 get_unaligned_le16(&report[i + 8]);
 419                                                         i += 15;
 420                                                         break;
 421
 422                                                 case WACOM_24HDT:
 423                                                         features->x_max =
 424                                                                 get_unaligned_le16(&report[i + 3]);
 425                                                         features->x_phy =
 426                                                                 get_unaligned_le16(&report[i + 8]);
 427                                                         features->unit = report[i - 1];
 428                                                         features->unitExpo = report[i - 3];
 429                                                         i += 12;
 430                                                         break;
 431
 432                                                 default:
 433                                                         features->x_max =
 434                                                                 get_unaligned_le16(&report[i + 3]);
 435                                                         features->x_phy =
 436                                                                 get_unaligned_le16(&report[i + 6]);
 437                                                         features->unit = report[i + 9];
 438                                                         features->unitExpo = report[i + 11];
 439                                                         i += 12;
 440                                                         break;
 441                                                 }
 442                                         } else if (pen) {
 443                                                 /* penabled only accepts exact bytes of data */
 444                                                 if (features->type >= TABLETPC)
 445                                                         features->pktlen = WACOM_PKGLEN_GRAPHIRE;
 446                                                 features->device_type = BTN_TOOL_PEN;
 447                                                 features->x_max =
 448                                                         get_unaligned_le16(&report[i + 3]);
 449                                                 i += 4;
 450                                         }
 451                                 }
 452                                 break;
 453
 454                         case HID_USAGE_Y:
 455                                 if (usage == WCM_DESKTOP) {
 456                                         if (finger) {
 457                                                 switch (features->type) {
 458                                                 case TABLETPC2FG:
 459                                                 case MTSCREEN:
 460                                                 case MTTPC:
 461                                                         features->y_max =
 462                                                                 get_unaligned_le16(&report[i + 3]);
 463                                                         features->y_phy =
 464                                                                 get_unaligned_le16(&report[i + 6]);
 465                                                         i += 7;
 466                                                         break;
 467
 468                                                 case WACOM_24HDT:
 469                                                         features->y_max =
 470                                                                 get_unaligned_le16(&report[i + 3]);
 471                                                         features->y_phy =
 472                                                                 get_unaligned_le16(&report[i - 2]);
 473                                                         i += 7;
 474                                                         break;
 475
 476                                                 case BAMBOO_PT:
 477                                                         features->y_phy =
 478                                                                 get_unaligned_le16(&report[i + 3]);
 479                                                         features->y_max =
 480                                                                 get_unaligned_le16(&report[i + 6]);
 481                                                         i += 12;
 482                                                         break;
 483
 484                                                 default:
 485                                                         features->y_max =
 486                                                                 features->x_max;
 487                                                         features->y_phy =
 488                                                                 get_unaligned_le16(&report[i + 3]);
 489                                                         i += 4;
 490                                                         break;
 491                                                 }
 492                                         } else if (pen) {
 493                                                 features->y_max =
 494                                                         get_unaligned_le16(&report[i + 3]);
 495                                                 i += 4;
 496                                         }
 497                                 }
 498                                 break;
 499
 500                         case HID_USAGE_FINGER:
 501                                 finger = 1;
 502                                 i++;
 503                                 break;
 504
 505                         /*
 506                          * Requiring Stylus Usage will ignore boot mouse
 507                          * X/Y values and some cases of invalid Digitizer X/Y
 508                          * values commonly reported.
 509                          */
 510                         case HID_USAGE_STYLUS:
 511                                 pen = 1;
 512                                 i++;
 513                                 break;
 514
 515                         case HID_USAGE_CONTACTMAX:
 516                                 /* leave touch_max as is if predefined */
 517                                 if (!features->touch_max)
 518                                         wacom_retrieve_report_data(intf, features);
 519                                 i++;
 520                                 break;
 521                         }
 522                         break;
 523
 524                 case HID_COLLECTION_END:
 525                         /* reset UsagePage and Finger */
 526                         finger = usage = 0;
 527                         break;
 528
 529                 case HID_COLLECTION:
 530                         i++;
 531                         switch (report[i]) {
 532                         case HID_COLLECTION_LOGICAL:
 533                                 i += wacom_parse_logical_collection(&report[i],
 534                                                                     features);
 535                                 break;
 536                         }
 537                         break;
 538                 }
 539         }
 540
 541  out:
 542         result = 0;
 543         kfree(report);
 544         return result;
 545 }
 546
 547 static int wacom_set_device_mode(struct usb_interface *intf, int report_id, int length, int mode)
 548 {
 549         unsigned char *rep_data;
 550         int error = -ENOMEM, limit = 0;
 551
 552         rep_data = kzalloc(length, GFP_KERNEL);
 553         if (!rep_data)
 554                 return error;
 555
 556         rep_data[0] = report_id;
 557         rep_data[1] = mode;
 558
 559         do {
 560                 error = wacom_set_report(intf, WAC_HID_FEATURE_REPORT,
 561                                          report_id, rep_data, length, 1);
 562                 if (error >= 0)
 563                         error = wacom_get_report(intf, WAC_HID_FEATURE_REPORT,
 564                                                  report_id, rep_data, length, 1);
 565         } while ((error < 0 || rep_data[1] != mode) && limit++ < WAC_MSG_RETRIES);
 566
 567         kfree(rep_data);
 568
 569         return error < 0 ? error : 0;
 570 }
 571
 572 /*
 573  * Switch the tablet into its most-capable mode. Wacom tablets are
 574  * typically configured to power-up in a mode which sends mouse-like
 575  * reports to the OS. To get absolute position, pressure data, etc.
 576  * from the tablet, it is necessary to switch the tablet out of this
 577  * mode and into one which sends the full range of tablet data.
 578  */
 579 static int wacom_query_tablet_data(struct usb_interface *intf, struct wacom_features *features)
 580 {
 581         if (features->device_type == BTN_TOOL_FINGER) {
 582                 if (features->type > TABLETPC) {
 583                         /* MT Tablet PC touch */
 584                         return wacom_set_device_mode(intf, 3, 4, 4);
 585                 }
 586                 else if (features->type == WACOM_24HDT) {
 587                         return wacom_set_device_mode(intf, 18, 3, 2);
 588                 }
 589         } else if (features->device_type == BTN_TOOL_PEN) {
 590                 if (features->type <= BAMBOO_PT && features->type != WIRELESS) {
 591                         return wacom_set_device_mode(intf, 2, 2, 2);
 592                 }
 593         }
 594
 595         return 0;
 596 }
 597
 598 static int wacom_retrieve_hid_descriptor(struct usb_interface *intf,
 599                                          struct wacom_features *features)
 600 {
 601         int error = 0;
 602         struct usb_host_interface *interface = intf->cur_altsetting;
 603         struct hid_descriptor *hid_desc;
 604
 605         /* default features */
 606         features->device_type = BTN_TOOL_PEN;
 607         features->x_fuzz = 4;
 608         features->y_fuzz = 4;
 609         features->pressure_fuzz = 0;
 610         features->distance_fuzz = 0;
 611
 612         /*
 613          * The wireless device HID is basic and layout conflicts with
 614          * other tablets (monitor and touch interface can look like pen).
 615          * Skip the query for this type and modify defaults based on
 616          * interface number.
 617          */
 618         if (features->type == WIRELESS) {
 619                 if (intf->cur_altsetting->desc.bInterfaceNumber == 0) {
 620                         features->device_type = 0;
 621                 } else if (intf->cur_altsetting->desc.bInterfaceNumber == 2) {
 622                         features->device_type = BTN_TOOL_FINGER;
 623                         features->pktlen = WACOM_PKGLEN_BBTOUCH3;
 624                 }
 625         }
 626
 627         /* only devices that support touch need to retrieve the info */
 628         if (features->type < BAMBOO_PT) {
 629                 goto out;
 630         }
 631
 632         error = usb_get_extra_descriptor(interface, HID_DEVICET_HID, &hid_desc);
 633         if (error) {
 634                 error = usb_get_extra_descriptor(&interface->endpoint[0],
 635                                                  HID_DEVICET_REPORT, &hid_desc);
 636                 if (error) {
 637                         dev_err(&intf->dev,
 638                                 "can not retrieve extra class descriptor\n");
 639                         goto out;
 640                 }
 641         }
 642         error = wacom_parse_hid(intf, hid_desc, features);
 643         if (error)
 644                 goto out;
 645         wacom_fix_phy_from_hid(features);
 646
 647  out:
 648         return error;
 649 }
 650
 651 struct wacom_usbdev_data {
 652         struct list_head list;
 653         struct kref kref;
 654         struct usb_device *dev;
 655         struct wacom_shared shared;
 656 };
 657
 658 static LIST_HEAD(wacom_udev_list);
 659 static DEFINE_MUTEX(wacom_udev_list_lock);
 660
 661 static struct usb_device *wacom_get_sibling(struct usb_device *dev, int vendor, int product)
 662 {
 663         int port1;
 664         struct usb_device *sibling;
 665
 666         if (vendor == 0 && product == 0)
 667                 return dev;
 668
 669         if (dev->parent == NULL)
 670                 return NULL;
 671
 672         usb_hub_for_each_child(dev->parent, port1, sibling) {
 673                 struct usb_device_descriptor *d;
 674                 if (sibling == NULL)
 675                         continue;
 676
 677                 d = &sibling->descriptor;
 678                 if (d->idVendor == vendor && d->idProduct == product)
 679                         return sibling;
 680         }
 681
 682         return NULL;
 683 }
 684
 685 static struct wacom_usbdev_data *wacom_get_usbdev_data(struct usb_device *dev)
 686 {
 687         struct wacom_usbdev_data *data;
 688
 689         list_for_each_entry(data, &wacom_udev_list, list) {
 690                 if (data->dev == dev) {
 691                         kref_get(&data->kref);
 692                         return data;
 693                 }
 694         }
 695
 696         return NULL;
 697 }
 698
 699 static int wacom_add_shared_data(struct wacom_wac *wacom,
 700                                  struct usb_device *dev)
 701 {
 702         struct wacom_usbdev_data *data;
 703         int retval = 0;
 704
 705         mutex_lock(&wacom_udev_list_lock);
 706
 707         data = wacom_get_usbdev_data(dev);
 708         if (!data) {
 709                 data = kzalloc(sizeof(struct wacom_usbdev_data), GFP_KERNEL);
 710                 if (!data) {
 711                         retval = -ENOMEM;
 712                         goto out;
 713                 }
 714
 715                 kref_init(&data->kref);
 716                 data->dev = dev;
 717                 list_add_tail(&data->list, &wacom_udev_list);
 718         }
 719
 720         wacom->shared = &data->shared;
 721
 722 out:
 723         mutex_unlock(&wacom_udev_list_lock);
 724         return retval;
 725 }
 726
 727 static void wacom_release_shared_data(struct kref *kref)
 728 {
 729         struct wacom_usbdev_data *data =
 730                 container_of(kref, struct wacom_usbdev_data, kref);
 731
 732         mutex_lock(&wacom_udev_list_lock);
 733         list_del(&data->list);
 734         mutex_unlock(&wacom_udev_list_lock);
 735
 736         kfree(data);
 737 }
 738
 739 static void wacom_remove_shared_data(struct wacom_wac *wacom)
 740 {
 741         struct wacom_usbdev_data *data;
 742
 743         if (wacom->shared) {
 744                 data = container_of(wacom->shared, struct wacom_usbdev_data, shared);
 745                 kref_put(&data->kref, wacom_release_shared_data);
 746                 wacom->shared = NULL;
 747         }
 748 }
 749
 750 static int wacom_led_control(struct wacom *wacom)
 751 {
 752         unsigned char *buf;
 753         int retval;
 754
 755         buf = kzalloc(9, GFP_KERNEL);
 756         if (!buf)
 757                 return -ENOMEM;
 758
 759         if (wacom->wacom_wac.features.type >= INTUOS5S &&
 760             wacom->wacom_wac.features.type <= INTUOS5L) {
 761                 /*
 762                  * Touch Ring and crop mark LED luminance may take on
 763                  * one of four values:
 764                  *    0 = Low; 1 = Medium; 2 = High; 3 = Off
 765                  */
 766                 int ring_led = wacom->led.select[0] & 0x03;
 767                 int ring_lum = (((wacom->led.llv & 0x60) >> 5) - 1) & 0x03;
 768                 int crop_lum = 0;
 769
 770                 buf[0] = WAC_CMD_LED_CONTROL;
 771                 buf[1] = (crop_lum << 4) | (ring_lum << 2) | (ring_led);
 772         }
 773         else {
 774                 int led = wacom->led.select[0] | 0x4;
 775
 776                 if (wacom->wacom_wac.features.type == WACOM_21UX2 ||
 777                     wacom->wacom_wac.features.type == WACOM_24HD)
 778                         led |= (wacom->led.select[1] << 4) | 0x40;
 779
 780                 buf[0] = WAC_CMD_LED_CONTROL;
 781                 buf[1] = led;
 782                 buf[2] = wacom->led.llv;
 783                 buf[3] = wacom->led.hlv;
 784                 buf[4] = wacom->led.img_lum;
 785         }
 786
 787         retval = wacom_set_report(wacom->intf, 0x03, WAC_CMD_LED_CONTROL,
 788                                   buf, 9, WAC_CMD_RETRIES);
 789         kfree(buf);
 790
 791         return retval;
 792 }
 793
 794 static int wacom_led_putimage(struct wacom *wacom, int button_id, const void *img)
 795 {
 796         unsigned char *buf;
 797         int i, retval;
 798
 799         buf = kzalloc(259, GFP_KERNEL);
 800         if (!buf)
 801                 return -ENOMEM;
 802
 803         /* Send 'start' command */
 804         buf[0] = WAC_CMD_ICON_START;
 805         buf[1] = 1;
 806         retval = wacom_set_report(wacom->intf, 0x03, WAC_CMD_ICON_START,
 807                                   buf, 2, WAC_CMD_RETRIES);
 808         if (retval < 0)
 809                 goto out;
 810
 811         buf[0] = WAC_CMD_ICON_XFER;
 812         buf[1] = button_id & 0x07;
 813         for (i = 0; i < 4; i++) {
 814                 buf[2] = i;
 815                 memcpy(buf + 3, img + i * 256, 256);
 816
 817                 retval = wacom_set_report(wacom->intf, 0x03, WAC_CMD_ICON_XFER,
 818                                           buf, 259, WAC_CMD_RETRIES);
 819                 if (retval < 0)
 820                         break;
 821         }
 822
 823         /* Send 'stop' */
 824         buf[0] = WAC_CMD_ICON_START;
 825         buf[1] = 0;
 826         wacom_set_report(wacom->intf, 0x03, WAC_CMD_ICON_START,
 827                          buf, 2, WAC_CMD_RETRIES);
 828
 829 out:
 830         kfree(buf);
 831         return retval;
 832 }
 833
 834 static ssize_t wacom_led_select_store(struct device *dev, int set_id,
 835                                       const char *buf, size_t count)
 836 {
 837         struct wacom *wacom = dev_get_drvdata(dev);
 838         unsigned int id;
 839         int err;
 840
 841         err = kstrtouint(buf, 10, &id);
 842         if (err)
 843                 return err;
 844
 845         mutex_lock(&wacom->lock);
 846
 847         wacom->led.select[set_id] = id & 0x3;
 848         err = wacom_led_control(wacom);
 849
 850         mutex_unlock(&wacom->lock);
 851
 852         return err < 0 ? err : count;
 853 }
 854
 855 #define DEVICE_LED_SELECT_ATTR(SET_ID)                                  \
 856 static ssize_t wacom_led##SET_ID##_select_store(struct device *dev,     \
 857         struct device_attribute *attr, const char *buf, size_t count)   \
 858 {                                                                       \
 859         return wacom_led_select_store(dev, SET_ID, buf, count);         \
 860 }                                                                       \
 861 static ssize_t wacom_led##SET_ID##_select_show(struct device *dev,      \
 862         struct device_attribute *attr, char *buf)                       \
 863 {                                                                       \
 864         struct wacom *wacom = dev_get_drvdata(dev);                     \
 865         return snprintf(buf, 2, "%d\n", wacom->led.select[SET_ID]);     \
 866 }                                                                       \
 867 static DEVICE_ATTR(status_led##SET_ID##_select, S_IWUSR | S_IRUSR,      \
 868                     wacom_led##SET_ID##_select_show,                    \
 869                     wacom_led##SET_ID##_select_store)
 870
 871 DEVICE_LED_SELECT_ATTR(0);
 872 DEVICE_LED_SELECT_ATTR(1);
 873
 874 static ssize_t wacom_luminance_store(struct wacom *wacom, u8 *dest,
 875                                      const char *buf, size_t count)
 876 {
 877         unsigned int value;
 878         int err;
 879
 880         err = kstrtouint(buf, 10, &value);
 881         if (err)
 882                 return err;
 883
 884         mutex_lock(&wacom->lock);
 885
 886         *dest = value & 0x7f;
 887         err = wacom_led_control(wacom);
 888
 889         mutex_unlock(&wacom->lock);
 890
 891         return err < 0 ? err : count;
 892 }
 893
 894 #define DEVICE_LUMINANCE_ATTR(name, field)                              \
 895 static ssize_t wacom_##name##_luminance_store(struct device *dev,       \
 896         struct device_attribute *attr, const char *buf, size_t count)   \
 897 {                                                                       \
 898         struct wacom *wacom = dev_get_drvdata(dev);                     \
 899                                                                         \
 900         return wacom_luminance_store(wacom, &wacom->led.field,          \
 901                                      buf, count);                       \
 902 }                                                                       \
 903 static DEVICE_ATTR(name##_luminance, S_IWUSR,                           \
 904                    NULL, wacom_##name##_luminance_store)
 905
 906 DEVICE_LUMINANCE_ATTR(status0, llv);
 907 DEVICE_LUMINANCE_ATTR(status1, hlv);
 908 DEVICE_LUMINANCE_ATTR(buttons, img_lum);
 909
 910 static ssize_t wacom_button_image_store(struct device *dev, int button_id,
 911                                         const char *buf, size_t count)
 912 {
 913         struct wacom *wacom = dev_get_drvdata(dev);
 914         int err;
 915
 916         if (count != 1024)
 917                 return -EINVAL;
 918
 919         mutex_lock(&wacom->lock);
 920
 921         err = wacom_led_putimage(wacom, button_id, buf);
 922
 923         mutex_unlock(&wacom->lock);
 924
 925         return err < 0 ? err : count;
 926 }
 927
 928 #define DEVICE_BTNIMG_ATTR(BUTTON_ID)                                   \
 929 static ssize_t wacom_btnimg##BUTTON_ID##_store(struct device *dev,      \
 930         struct device_attribute *attr, const char *buf, size_t count)   \
 931 {                                                                       \
 932         return wacom_button_image_store(dev, BUTTON_ID, buf, count);    \
 933 }                                                                       \
 934 static DEVICE_ATTR(button##BUTTON_ID##_rawimg, S_IWUSR,                 \
 935                    NULL, wacom_btnimg##BUTTON_ID##_store)
 936
 937 DEVICE_BTNIMG_ATTR(0);
 938 DEVICE_BTNIMG_ATTR(1);
 939 DEVICE_BTNIMG_ATTR(2);
 940 DEVICE_BTNIMG_ATTR(3);
 941 DEVICE_BTNIMG_ATTR(4);
 942 DEVICE_BTNIMG_ATTR(5);
 943 DEVICE_BTNIMG_ATTR(6);
 944 DEVICE_BTNIMG_ATTR(7);
 945
 946 static struct attribute *cintiq_led_attrs[] = {
 947         &dev_attr_status_led0_select.attr,
 948         &dev_attr_status_led1_select.attr,
 949         NULL
 950 };
 951
 952 static struct attribute_group cintiq_led_attr_group = {
 953         .name = "wacom_led",
 954         .attrs = cintiq_led_attrs,
 955 };
 956
 957 static struct attribute *intuos4_led_attrs[] = {
 958         &dev_attr_status0_luminance.attr,
 959         &dev_attr_status1_luminance.attr,
 960         &dev_attr_status_led0_select.attr,
 961         &dev_attr_buttons_luminance.attr,
 962         &dev_attr_button0_rawimg.attr,
 963         &dev_attr_button1_rawimg.attr,
 964         &dev_attr_button2_rawimg.attr,
 965         &dev_attr_button3_rawimg.attr,
 966         &dev_attr_button4_rawimg.attr,
 967         &dev_attr_button5_rawimg.attr,
 968         &dev_attr_button6_rawimg.attr,
 969         &dev_attr_button7_rawimg.attr,
 970         NULL
 971 };
 972
 973 static struct attribute_group intuos4_led_attr_group = {
 974         .name = "wacom_led",
 975         .attrs = intuos4_led_attrs,
 976 };
 977
 978 static struct attribute *intuos5_led_attrs[] = {
 979         &dev_attr_status0_luminance.attr,
 980         &dev_attr_status_led0_select.attr,
 981         NULL
 982 };
 983
 984 static struct attribute_group intuos5_led_attr_group = {
 985         .name = "wacom_led",
 986         .attrs = intuos5_led_attrs,
 987 };
 988
 989 static int wacom_initialize_leds(struct wacom *wacom)
 990 {
 991         int error;
 992
 993         /* Initialize default values */
 994         switch (wacom->wacom_wac.features.type) {
 995         case INTUOS4S:
 996         case INTUOS4:
 997         case INTUOS4L:
 998                 wacom->led.select[0] = 0;
 999                 wacom->led.select[1] = 0;
1000                 wacom->led.llv = 10;
1001                 wacom->led.hlv = 20;
1002                 wacom->led.img_lum = 10;
1003                 error = sysfs_create_group(&wacom->intf->dev.kobj,
1004                                            &intuos4_led_attr_group);
1005                 break;
1006
1007         case WACOM_24HD:
1008         case WACOM_21UX2:
1009                 wacom->led.select[0] = 0;
1010                 wacom->led.select[1] = 0;
1011                 wacom->led.llv = 0;
1012                 wacom->led.hlv = 0;
1013                 wacom->led.img_lum = 0;
1014
1015                 error = sysfs_create_group(&wacom->intf->dev.kobj,
1016                                            &cintiq_led_attr_group);
1017                 break;
1018
1019         case INTUOS5S:
1020         case INTUOS5:
1021         case INTUOS5L:
1022                 wacom->led.select[0] = 0;
1023                 wacom->led.select[1] = 0;
1024                 wacom->led.llv = 32;
1025                 wacom->led.hlv = 0;
1026                 wacom->led.img_lum = 0;
1027
1028                 error = sysfs_create_group(&wacom->intf->dev.kobj,
1029                                            &intuos5_led_attr_group);
1030                 break;
1031
1032         default:
1033                 return 0;
1034         }
1035
1036         if (error) {
1037                 dev_err(&wacom->intf->dev,
1038                         "cannot create sysfs group err: %d\n", error);
1039                 return error;
1040         }
1041         wacom_led_control(wacom);
1042
1043         return 0;
1044 }
1045
1046 static void wacom_destroy_leds(struct wacom *wacom)
1047 {
1048         switch (wacom->wacom_wac.features.type) {
1049         case INTUOS4S:
1050         case INTUOS4:
1051         case INTUOS4L:
1052                 sysfs_remove_group(&wacom->intf->dev.kobj,
1053                                    &intuos4_led_attr_group);
1054                 break;
1055
1056         case WACOM_24HD:
1057         case WACOM_21UX2:
1058                 sysfs_remove_group(&wacom->intf->dev.kobj,
1059                                    &cintiq_led_attr_group);
1060                 break;
1061
1062         case INTUOS5S:
1063         case INTUOS5:
1064         case INTUOS5L:
1065                 sysfs_remove_group(&wacom->intf->dev.kobj,
1066                                    &intuos5_led_attr_group);
1067                 break;
1068         }
1069 }
1070
1071 static enum power_supply_property wacom_battery_props[] = {
1072         POWER_SUPPLY_PROP_CAPACITY
1073 };
1074
1075 static int wacom_battery_get_property(struct power_supply *psy,
1076                                       enum power_supply_property psp,
1077                                       union power_supply_propval *val)
1078 {
1079         struct wacom *wacom = container_of(psy, struct wacom, battery);
1080         int ret = 0;
1081
1082         switch (psp) {
1083                 case POWER_SUPPLY_PROP_CAPACITY:
1084                         val->intval =
1085                                 wacom->wacom_wac.battery_capacity * 100 / 31;
1086                         break;
1087                 default:
1088                         ret = -EINVAL;
1089                         break;
1090         }
1091
1092         return ret;
1093 }
1094
1095 static int wacom_initialize_battery(struct wacom *wacom)
1096 {
1097         int error = 0;
1098
1099         if (wacom->wacom_wac.features.quirks & WACOM_QUIRK_MONITOR) {
1100                 wacom->battery.properties = wacom_battery_props;
1101                 wacom->battery.num_properties = ARRAY_SIZE(wacom_battery_props);
1102                 wacom->battery.get_property = wacom_battery_get_property;
1103                 wacom->battery.name = "wacom_battery";
1104                 wacom->battery.type = POWER_SUPPLY_TYPE_BATTERY;
1105                 wacom->battery.use_for_apm = 0;
1106
1107                 error = power_supply_register(&wacom->usbdev->dev,
1108                                               &wacom->battery);
1109
1110                 if (!error)
1111                         power_supply_powers(&wacom->battery,
1112                                             &wacom->usbdev->dev);
1113         }
1114
1115         return error;
1116 }
1117
1118 static void wacom_destroy_battery(struct wacom *wacom)
1119 {
1120         if (wacom->wacom_wac.features.quirks & WACOM_QUIRK_MONITOR &&
1121             wacom->battery.dev) {
1122                 power_supply_unregister(&wacom->battery);
1123                 wacom->battery.dev = NULL;
1124         }
1125 }
1126
1127 static int wacom_register_input(struct wacom *wacom)
1128 {
1129         struct input_dev *input_dev;
1130         struct usb_interface *intf = wacom->intf;
1131         struct usb_device *dev = interface_to_usbdev(intf);
1132         struct wacom_wac *wacom_wac = &(wacom->wacom_wac);
1133         int error;
1134
1135         input_dev = input_allocate_device();
1136         if (!input_dev) {
1137                 error = -ENOMEM;
1138                 goto fail1;
1139         }
1140
1141         input_dev->name = wacom_wac->name;
1142         input_dev->dev.parent = &intf->dev;
1143         input_dev->open = wacom_open;
1144         input_dev->close = wacom_close;
1145         usb_to_input_id(dev, &input_dev->id);
1146         input_set_drvdata(input_dev, wacom);
1147
1148         wacom_wac->input = input_dev;
1149         error = wacom_setup_input_capabilities(input_dev, wacom_wac);
1150         if (error)
1151                 goto fail1;
1152
1153         error = input_register_device(input_dev);
1154         if (error)
1155                 goto fail2;
1156
1157         return 0;
1158
1159 fail2:
1160         input_free_device(input_dev);
1161         wacom_wac->input = NULL;
1162 fail1:
1163         return error;
1164 }
1165
1166 static void wacom_wireless_work(struct work_struct *work)
1167 {
1168         struct wacom *wacom = container_of(work, struct wacom, work);
1169         struct usb_device *usbdev = wacom->usbdev;
1170         struct wacom_wac *wacom_wac = &wacom->wacom_wac;
1171         struct wacom *wacom1, *wacom2;
1172         struct wacom_wac *wacom_wac1, *wacom_wac2;
1173         int error;
1174
1175         /*
1176          * Regardless if this is a disconnect or a new tablet,
1177          * remove any existing input and battery devices.
1178          */
1179
1180         wacom_destroy_battery(wacom);
1181
1182         /* Stylus interface */
1183         wacom1 = usb_get_intfdata(usbdev->config->interface[1]);
1184         wacom_wac1 = &(wacom1->wacom_wac);
1185         if (wacom_wac1->input)
1186                 input_unregister_device(wacom_wac1->input);
1187         wacom_wac1->input = NULL;
1188
1189         /* Touch interface */
1190         wacom2 = usb_get_intfdata(usbdev->config->interface[2]);
1191         wacom_wac2 = &(wacom2->wacom_wac);
1192         if (wacom_wac2->input)
1193                 input_unregister_device(wacom_wac2->input);
1194         wacom_wac2->input = NULL;
1195
1196         if (wacom_wac->pid == 0) {
1197                 dev_info(&wacom->intf->dev, "wireless tablet disconnected\n");
1198         } else {
1199                 const struct usb_device_id *id = wacom_ids;
1200
1201                 dev_info(&wacom->intf->dev,
1202                          "wireless tablet connected with PID %x\n",
1203                          wacom_wac->pid);
1204
1205                 while (id->match_flags) {
1206                         if (id->idVendor == USB_VENDOR_ID_WACOM &&
1207                             id->idProduct == wacom_wac->pid)
1208                                 break;
1209                         id++;
1210                 }
1211
1212                 if (!id->match_flags) {
1213                         dev_info(&wacom->intf->dev,
1214                                  "ignoring unknown PID.\n");
1215                         return;
1216                 }
1217
1218                 /* Stylus interface */
1219                 wacom_wac1->features =
1220                         *((struct wacom_features *)id->driver_info);
1221                 wacom_wac1->features.device_type = BTN_TOOL_PEN;
1222                 error = wacom_register_input(wacom1);
1223                 if (error)
1224                         goto fail1;
1225
1226                 /* Touch interface */
1227                 wacom_wac2->features =
1228                         *((struct wacom_features *)id->driver_info);
1229                 wacom_wac2->features.pktlen = WACOM_PKGLEN_BBTOUCH3;
1230                 wacom_wac2->features.device_type = BTN_TOOL_FINGER;
1231                 wacom_set_phy_from_res(&wacom_wac2->features);
1232                 wacom_wac2->features.x_max = wacom_wac2->features.y_max = 4096;
1233                 error = wacom_register_input(wacom2);
1234                 if (error)
1235                         goto fail2;
1236
1237                 error = wacom_initialize_battery(wacom);
1238                 if (error)
1239                         goto fail3;
1240         }
1241
1242         return;
1243
1244 fail3:
1245         input_unregister_device(wacom_wac2->input);
1246         wacom_wac2->input = NULL;
1247 fail2:
1248         input_unregister_device(wacom_wac1->input);
1249         wacom_wac1->input = NULL;
1250 fail1:
1251         return;
1252 }
1253
1254 static int wacom_probe(struct usb_interface *intf, const struct usb_device_id *id)
1255 {
1256         struct usb_device *dev = interface_to_usbdev(intf);
1257         struct usb_endpoint_descriptor *endpoint;
1258         struct wacom *wacom;
1259         struct wacom_wac *wacom_wac;
1260         struct wacom_features *features;
1261         int error;
1262
1263         if (!id->driver_info)
1264                 return -EINVAL;
1265
1266         wacom = kzalloc(sizeof(struct wacom), GFP_KERNEL);
1267         if (!wacom)
1268                 return -ENOMEM;
1269
1270         wacom_wac = &wacom->wacom_wac;
1271         wacom_wac->features = *((struct wacom_features *)id->driver_info);
1272         features = &wacom_wac->features;
1273         if (features->pktlen > WACOM_PKGLEN_MAX) {
1274                 error = -EINVAL;
1275                 goto fail1;
1276         }
1277
1278         wacom_wac->data = usb_alloc_coherent(dev, WACOM_PKGLEN_MAX,
1279                                              GFP_KERNEL, &wacom->data_dma);
1280         if (!wacom_wac->data) {
1281                 error = -ENOMEM;
1282                 goto fail1;
1283         }
1284
1285         wacom->irq = usb_alloc_urb(0, GFP_KERNEL);
1286         if (!wacom->irq) {
1287                 error = -ENOMEM;
1288                 goto fail2;
1289         }
1290
1291         wacom->usbdev = dev;
1292         wacom->intf = intf;
1293         mutex_init(&wacom->lock);
1294         INIT_WORK(&wacom->work, wacom_wireless_work);
1295         usb_make_path(dev, wacom->phys, sizeof(wacom->phys));
1296         strlcat(wacom->phys, "/input0", sizeof(wacom->phys));
1297
1298         endpoint = &intf->cur_altsetting->endpoint[0].desc;
1299
1300         /* Retrieve the physical and logical size for touch devices */
1301         error = wacom_retrieve_hid_descriptor(intf, features);
1302         if (error)
1303                 goto fail3;
1304
1305         /*
1306          * Intuos5 has no useful data about its touch interface in its
1307          * HID descriptor. If this is the touch interface (wMaxPacketSize
1308          * of WACOM_PKGLEN_BBTOUCH3), override the table values.
1309          */
1310         if (features->type >= INTUOS5S && features->type <= INTUOS5L) {
1311                 if (endpoint->wMaxPacketSize == WACOM_PKGLEN_BBTOUCH3) {
1312                         features->device_type = BTN_TOOL_FINGER;
1313                         features->pktlen = WACOM_PKGLEN_BBTOUCH3;
1314
1315                         wacom_set_phy_from_res(features);
1316
1317                         features->x_max = 4096;
1318                         features->y_max = 4096;
1319                 } else {
1320                         features->device_type = BTN_TOOL_PEN;
1321                 }
1322         }
1323
1324         wacom_setup_device_quirks(features);
1325
1326         strlcpy(wacom_wac->name, features->name, sizeof(wacom_wac->name));
1327
1328         if (features->quirks & WACOM_QUIRK_MULTI_INPUT) {
1329                 struct usb_device *other_dev;
1330
1331                 /* Append the device type to the name */
1332                 strlcat(wacom_wac->name,
1333                         features->device_type == BTN_TOOL_PEN ?
1334                                 " Pen" : " Finger",
1335                         sizeof(wacom_wac->name));
1336
1337
1338                 other_dev = wacom_get_sibling(dev, features->oVid, features->oPid);
1339                 if (other_dev == NULL || wacom_get_usbdev_data(other_dev) == NULL)
1340                         other_dev = dev;
1341                 error = wacom_add_shared_data(wacom_wac, other_dev);
1342                 if (error)
1343                         goto fail3;
1344         }
1345
1346         usb_fill_int_urb(wacom->irq, dev,
1347                          usb_rcvintpipe(dev, endpoint->bEndpointAddress),
1348                          wacom_wac->data, features->pktlen,
1349                          wacom_sys_irq, wacom, endpoint->bInterval);
1350         wacom->irq->transfer_dma = wacom->data_dma;
1351         wacom->irq->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
1352
1353         error = wacom_initialize_leds(wacom);
1354         if (error)
1355                 goto fail4;
1356
1357         if (!(features->quirks & WACOM_QUIRK_NO_INPUT)) {
1358                 error = wacom_register_input(wacom);
1359                 if (error)
1360                         goto fail5;
1361         }
1362
1363         /* Note that if query fails it is not a hard failure */
1364         wacom_query_tablet_data(intf, features);
1365
1366         usb_set_intfdata(intf, wacom);
1367
1368         if (features->quirks & WACOM_QUIRK_MONITOR) {
1369                 if (usb_submit_urb(wacom->irq, GFP_KERNEL))
1370                         goto fail5;
1371         }
1372
1373         return 0;
1374
1375  fail5: wacom_destroy_leds(wacom);
1376  fail4: wacom_remove_shared_data(wacom_wac);
1377  fail3: usb_free_urb(wacom->irq);
1378  fail2: usb_free_coherent(dev, WACOM_PKGLEN_MAX, wacom_wac->data, wacom->data_dma);
1379  fail1: kfree(wacom);
1380         return error;
1381 }
1382
1383 static void wacom_disconnect(struct usb_interface *intf)
1384 {
1385         struct wacom *wacom = usb_get_intfdata(intf);
1386
1387         usb_set_intfdata(intf, NULL);
1388
1389         usb_kill_urb(wacom->irq);
1390         cancel_work_sync(&wacom->work);
1391         if (wacom->wacom_wac.input)
1392                 input_unregister_device(wacom->wacom_wac.input);
1393         wacom_destroy_battery(wacom);
1394         wacom_destroy_leds(wacom);
1395         usb_free_urb(wacom->irq);
1396         usb_free_coherent(interface_to_usbdev(intf), WACOM_PKGLEN_MAX,
1397                         wacom->wacom_wac.data, wacom->data_dma);
1398         wacom_remove_shared_data(&wacom->wacom_wac);
1399         kfree(wacom);
1400 }
1401
1402 static int wacom_suspend(struct usb_interface *intf, pm_message_t message)
1403 {
1404         struct wacom *wacom = usb_get_intfdata(intf);
1405
1406         mutex_lock(&wacom->lock);
1407         usb_kill_urb(wacom->irq);
1408         mutex_unlock(&wacom->lock);
1409
1410         return 0;
1411 }
1412
1413 static int wacom_resume(struct usb_interface *intf)
1414 {
1415         struct wacom *wacom = usb_get_intfdata(intf);
1416         struct wacom_features *features = &wacom->wacom_wac.features;
1417         int rv = 0;
1418
1419         mutex_lock(&wacom->lock);
1420
1421         /* switch to wacom mode first */
1422         wacom_query_tablet_data(intf, features);
1423         wacom_led_control(wacom);
1424
1425         if ((wacom->open || features->quirks & WACOM_QUIRK_MONITOR)
1426              && usb_submit_urb(wacom->irq, GFP_NOIO) < 0)
1427                 rv = -EIO;
1428
1429         mutex_unlock(&wacom->lock);
1430
1431         return rv;
1432 }
1433
1434 static int wacom_reset_resume(struct usb_interface *intf)
1435 {
1436         return wacom_resume(intf);
1437 }
1438
1439 static struct usb_driver wacom_driver = {
1440         .name =         "wacom",
1441         .id_table =     wacom_ids,
1442         .probe =        wacom_probe,
1443         .disconnect =   wacom_disconnect,
1444         .suspend =      wacom_suspend,
1445         .resume =       wacom_resume,
1446         .reset_resume = wacom_reset_resume,
1447         .supports_autosuspend = 1,
1448 };
1449
1450 module_usb_driver(wacom_driver);