drivers/input/tablet/wacom_sys.c

   1 /*
   2  * drivers/input/tablet/wacom_sys.c
   3  *
   4  *  USB Wacom Graphire and Wacom Intuos 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.h"
  15 #include "wacom_wac.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_COLLECTION                  0xc0
  32
  33 enum {
  34         WCM_UNDEFINED = 0,
  35         WCM_DESKTOP,
  36         WCM_DIGITIZER,
  37 };
  38
  39 struct hid_descriptor {
  40         struct usb_descriptor_header header;
  41         __le16   bcdHID;
  42         u8       bCountryCode;
  43         u8       bNumDescriptors;
  44         u8       bDescriptorType;
  45         __le16   wDescriptorLength;
  46 } __attribute__ ((packed));
  47
  48 /* defines to get/set USB message */
  49 #define USB_REQ_GET_REPORT      0x01
  50 #define USB_REQ_SET_REPORT      0x09
  51 #define WAC_HID_FEATURE_REPORT  0x03
  52
  53 static int usb_get_report(struct usb_interface *intf, unsigned char type,
  54                                 unsigned char id, void *buf, int size)
  55 {
  56         return usb_control_msg(interface_to_usbdev(intf),
  57                 usb_rcvctrlpipe(interface_to_usbdev(intf), 0),
  58                 USB_REQ_GET_REPORT, USB_TYPE_CLASS | USB_RECIP_INTERFACE,
  59                 (type << 8) + id, intf->altsetting[0].desc.bInterfaceNumber,
  60                 buf, size, 100);
  61 }
  62
  63 static int usb_set_report(struct usb_interface *intf, unsigned char type,
  64                                 unsigned char id, void *buf, int size)
  65 {
  66         return usb_control_msg(interface_to_usbdev(intf),
  67                 usb_sndctrlpipe(interface_to_usbdev(intf), 0),
  68                 USB_REQ_SET_REPORT, USB_TYPE_CLASS | USB_RECIP_INTERFACE,
  69                 (type << 8) + id, intf->altsetting[0].desc.bInterfaceNumber,
  70                 buf, size, 1000);
  71 }
  72
  73 static struct input_dev * get_input_dev(struct wacom_combo *wcombo)
  74 {
  75         return wcombo->wacom->dev;
  76 }
  77
  78 static void wacom_sys_irq(struct urb *urb)
  79 {
  80         struct wacom *wacom = urb->context;
  81         struct wacom_combo wcombo;
  82         int retval;
  83
  84         switch (urb->status) {
  85         case 0:
  86                 /* success */
  87                 break;
  88         case -ECONNRESET:
  89         case -ENOENT:
  90         case -ESHUTDOWN:
  91                 /* this urb is terminated, clean up */
  92                 dbg("%s - urb shutting down with status: %d", __func__, urb->status);
  93                 return;
  94         default:
  95                 dbg("%s - nonzero urb status received: %d", __func__, urb->status);
  96                 goto exit;
  97         }
  98
  99         wcombo.wacom = wacom;
 100         wcombo.urb = urb;
 101
 102         if (wacom_wac_irq(wacom->wacom_wac, (void *)&wcombo))
 103                 input_sync(get_input_dev(&wcombo));
 104
 105  exit:
 106         usb_mark_last_busy(wacom->usbdev);
 107         retval = usb_submit_urb (urb, GFP_ATOMIC);
 108         if (retval)
 109                 err ("%s - usb_submit_urb failed with result %d",
 110                      __func__, retval);
 111 }
 112
 113 void wacom_report_key(void *wcombo, unsigned int key_type, int key_data)
 114 {
 115         input_report_key(get_input_dev((struct wacom_combo *)wcombo), key_type, key_data);
 116 }
 117
 118 void wacom_report_abs(void *wcombo, unsigned int abs_type, int abs_data)
 119 {
 120         input_report_abs(get_input_dev((struct wacom_combo *)wcombo), abs_type, abs_data);
 121 }
 122
 123 void wacom_report_rel(void *wcombo, unsigned int rel_type, int rel_data)
 124 {
 125         input_report_rel(get_input_dev((struct wacom_combo *)wcombo), rel_type, rel_data);
 126 }
 127
 128 void wacom_input_event(void *wcombo, unsigned int type, unsigned int code, int value)
 129 {
 130         input_event(get_input_dev((struct wacom_combo *)wcombo), type, code, value);
 131 }
 132
 133 __u16 wacom_be16_to_cpu(unsigned char *data)
 134 {
 135         __u16 value;
 136         value = be16_to_cpu(*(__be16 *) data);
 137         return value;
 138 }
 139
 140 __u16 wacom_le16_to_cpu(unsigned char *data)
 141 {
 142         __u16 value;
 143         value = le16_to_cpu(*(__le16 *) data);
 144         return value;
 145 }
 146
 147 void wacom_input_sync(void *wcombo)
 148 {
 149         input_sync(get_input_dev((struct wacom_combo *)wcombo));
 150 }
 151
 152 static int wacom_open(struct input_dev *dev)
 153 {
 154         struct wacom *wacom = input_get_drvdata(dev);
 155
 156         mutex_lock(&wacom->lock);
 157
 158         wacom->irq->dev = wacom->usbdev;
 159
 160         if (usb_autopm_get_interface(wacom->intf) < 0) {
 161                 mutex_unlock(&wacom->lock);
 162                 return -EIO;
 163         }
 164
 165         if (usb_submit_urb(wacom->irq, GFP_KERNEL)) {
 166                 usb_autopm_put_interface(wacom->intf);
 167                 mutex_unlock(&wacom->lock);
 168                 return -EIO;
 169         }
 170
 171         wacom->open = 1;
 172         wacom->intf->needs_remote_wakeup = 1;
 173
 174         mutex_unlock(&wacom->lock);
 175         return 0;
 176 }
 177
 178 static void wacom_close(struct input_dev *dev)
 179 {
 180         struct wacom *wacom = input_get_drvdata(dev);
 181
 182         mutex_lock(&wacom->lock);
 183         usb_kill_urb(wacom->irq);
 184         wacom->open = 0;
 185         wacom->intf->needs_remote_wakeup = 0;
 186         mutex_unlock(&wacom->lock);
 187 }
 188
 189 void input_dev_mo(struct input_dev *input_dev, struct wacom_wac *wacom_wac)
 190 {
 191         input_dev->keybit[BIT_WORD(BTN_MISC)] |= BIT_MASK(BTN_1) |
 192                 BIT_MASK(BTN_5);
 193         input_set_abs_params(input_dev, ABS_WHEEL, 0, 71, 0, 0);
 194 }
 195
 196 void input_dev_g4(struct input_dev *input_dev, struct wacom_wac *wacom_wac)
 197 {
 198         input_dev->evbit[0] |= BIT_MASK(EV_MSC);
 199         input_dev->mscbit[0] |= BIT_MASK(MSC_SERIAL);
 200         input_dev->keybit[BIT_WORD(BTN_DIGI)] |= BIT_MASK(BTN_TOOL_FINGER);
 201         input_dev->keybit[BIT_WORD(BTN_MISC)] |= BIT_MASK(BTN_0) |
 202                 BIT_MASK(BTN_4);
 203 }
 204
 205 void input_dev_g(struct input_dev *input_dev, struct wacom_wac *wacom_wac)
 206 {
 207         input_dev->evbit[0] |= BIT_MASK(EV_REL);
 208         input_dev->relbit[0] |= BIT_MASK(REL_WHEEL);
 209         input_dev->keybit[BIT_WORD(BTN_MOUSE)] |= BIT_MASK(BTN_LEFT) |
 210                 BIT_MASK(BTN_RIGHT) | BIT_MASK(BTN_MIDDLE);
 211         input_dev->keybit[BIT_WORD(BTN_DIGI)] |= BIT_MASK(BTN_TOOL_RUBBER) |
 212                 BIT_MASK(BTN_TOOL_MOUSE) | BIT_MASK(BTN_STYLUS2);
 213         input_set_abs_params(input_dev, ABS_DISTANCE, 0, wacom_wac->features->distance_max, 0, 0);
 214 }
 215
 216 void input_dev_i3s(struct input_dev *input_dev, struct wacom_wac *wacom_wac)
 217 {
 218         input_dev->keybit[BIT_WORD(BTN_DIGI)] |= BIT_MASK(BTN_TOOL_FINGER);
 219         input_dev->keybit[BIT_WORD(BTN_MISC)] |= BIT_MASK(BTN_0) |
 220                 BIT_MASK(BTN_1) | BIT_MASK(BTN_2) | BIT_MASK(BTN_3);
 221         input_set_abs_params(input_dev, ABS_RX, 0, 4096, 0, 0);
 222         input_set_abs_params(input_dev, ABS_Z, -900, 899, 0, 0);
 223 }
 224
 225 void input_dev_i3(struct input_dev *input_dev, struct wacom_wac *wacom_wac)
 226 {
 227         input_dev->keybit[BIT_WORD(BTN_MISC)] |= BIT_MASK(BTN_4) |
 228                 BIT_MASK(BTN_5) | BIT_MASK(BTN_6) | BIT_MASK(BTN_7);
 229         input_set_abs_params(input_dev, ABS_RY, 0, 4096, 0, 0);
 230 }
 231
 232 void input_dev_bee(struct input_dev *input_dev, struct wacom_wac *wacom_wac)
 233 {
 234         input_dev->keybit[BIT_WORD(BTN_MISC)] |= BIT_MASK(BTN_8) | BIT_MASK(BTN_9);
 235 }
 236
 237 void input_dev_i(struct input_dev *input_dev, struct wacom_wac *wacom_wac)
 238 {
 239         input_dev->evbit[0] |= BIT_MASK(EV_MSC) | BIT_MASK(EV_REL);
 240         input_dev->mscbit[0] |= BIT_MASK(MSC_SERIAL);
 241         input_dev->relbit[0] |= BIT_MASK(REL_WHEEL);
 242         input_dev->keybit[BIT_WORD(BTN_MOUSE)] |= BIT_MASK(BTN_LEFT) |
 243                 BIT_MASK(BTN_RIGHT) | BIT_MASK(BTN_MIDDLE) |
 244                 BIT_MASK(BTN_SIDE) | BIT_MASK(BTN_EXTRA);
 245         input_dev->keybit[BIT_WORD(BTN_DIGI)] |= BIT_MASK(BTN_TOOL_RUBBER) |
 246                 BIT_MASK(BTN_TOOL_MOUSE) | BIT_MASK(BTN_TOOL_BRUSH) |
 247                 BIT_MASK(BTN_TOOL_PENCIL) | BIT_MASK(BTN_TOOL_AIRBRUSH) |
 248                 BIT_MASK(BTN_TOOL_LENS) | BIT_MASK(BTN_STYLUS2);
 249         input_set_abs_params(input_dev, ABS_DISTANCE, 0, wacom_wac->features->distance_max, 0, 0);
 250         input_set_abs_params(input_dev, ABS_WHEEL, 0, 1023, 0, 0);
 251         input_set_abs_params(input_dev, ABS_TILT_X, 0, 127, 0, 0);
 252         input_set_abs_params(input_dev, ABS_TILT_Y, 0, 127, 0, 0);
 253         input_set_abs_params(input_dev, ABS_RZ, -900, 899, 0, 0);
 254         input_set_abs_params(input_dev, ABS_THROTTLE, -1023, 1023, 0, 0);
 255 }
 256
 257 void input_dev_pl(struct input_dev *input_dev, struct wacom_wac *wacom_wac)
 258 {
 259         input_dev->keybit[BIT_WORD(BTN_DIGI)] |= BIT_MASK(BTN_STYLUS2);
 260 }
 261
 262 void input_dev_pt(struct input_dev *input_dev, struct wacom_wac *wacom_wac)
 263 {
 264         input_dev->keybit[BIT_WORD(BTN_DIGI)] |= BIT_MASK(BTN_TOOL_RUBBER);
 265 }
 266
 267 static int wacom_parse_hid(struct usb_interface *intf, struct hid_descriptor *hid_desc,
 268                            struct wacom_wac *wacom_wac)
 269 {
 270         struct usb_device *dev = interface_to_usbdev(intf);
 271         struct wacom_features *features = wacom_wac->features;
 272         char limit = 0, result = 0;
 273         int i = 0, usage = WCM_UNDEFINED, finger = 0, pen = 0;
 274         unsigned char *report;
 275
 276         report = kzalloc(hid_desc->wDescriptorLength, GFP_KERNEL);
 277         if (!report)
 278                 return -ENOMEM;
 279
 280         /* retrive report descriptors */
 281         do {
 282                 result = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0),
 283                         USB_REQ_GET_DESCRIPTOR,
 284                         USB_RECIP_INTERFACE | USB_DIR_IN,
 285                         HID_DEVICET_REPORT << 8,
 286                         intf->altsetting[0].desc.bInterfaceNumber, /* interface */
 287                         report,
 288                         hid_desc->wDescriptorLength,
 289                         5000); /* 5 secs */
 290         } while (result < 0 && limit++ < 5);
 291
 292         /* No need to parse the Descriptor. It isn't an error though */
 293         if (result < 0)
 294                 goto out;
 295
 296         for (i = 0; i < hid_desc->wDescriptorLength; i++) {
 297
 298                 switch (report[i]) {
 299                 case HID_USAGE_PAGE:
 300                         switch (report[i + 1]) {
 301                         case HID_USAGE_PAGE_DIGITIZER:
 302                                 usage = WCM_DIGITIZER;
 303                                 i++;
 304                                 break;
 305
 306                         case HID_USAGE_PAGE_DESKTOP:
 307                                 usage = WCM_DESKTOP;
 308                                 i++;
 309                                 break;
 310                         }
 311                         break;
 312
 313                 case HID_USAGE:
 314                         switch (report[i + 1]) {
 315                         case HID_USAGE_X:
 316                                 if (usage == WCM_DESKTOP) {
 317                                         if (finger) {
 318                                                 features->touch_x_max =
 319                                                         features->touch_y_max =
 320                                                         wacom_le16_to_cpu(&report[i + 3]);
 321                                                 features->x_max =
 322                                                         wacom_le16_to_cpu(&report[i + 6]);
 323                                                 i += 7;
 324                                         } else if (pen) {
 325                                                 features->x_max =
 326                                                         wacom_le16_to_cpu(&report[i + 3]);
 327                                                 i += 4;
 328                                         }
 329                                 } else if (usage == WCM_DIGITIZER) {
 330                                         /* max pressure isn't reported
 331                                         features->pressure_max = (unsigned short)
 332                                                         (report[i+4] << 8  | report[i + 3]);
 333                                         */
 334                                         features->pressure_max = 255;
 335                                         i += 4;
 336                                 }
 337                                 break;
 338
 339                         case HID_USAGE_Y:
 340                                 if (usage == WCM_DESKTOP)
 341                                         features->y_max =
 342                                                 wacom_le16_to_cpu(&report[i + 3]);
 343                                 i += 4;
 344                                 break;
 345
 346                         case HID_USAGE_FINGER:
 347                                 finger = 1;
 348                                 i++;
 349                                 break;
 350
 351                         case HID_USAGE_STYLUS:
 352                                 pen = 1;
 353                                 i++;
 354                                 break;
 355
 356                         case HID_USAGE_UNDEFINED:
 357                                 if (usage == WCM_DESKTOP && finger) /* capacity */
 358                                         features->pressure_max =
 359                                                 wacom_le16_to_cpu(&report[i + 3]);
 360                                 i += 4;
 361                                 break;
 362                         }
 363                         break;
 364
 365                 case HID_COLLECTION:
 366                         /* reset UsagePage ans Finger */
 367                         finger = usage = 0;
 368                         break;
 369                 }
 370         }
 371
 372  out:
 373         result = 0;
 374         kfree(report);
 375         return result;
 376 }
 377
 378 static int wacom_probe(struct usb_interface *intf, const struct usb_device_id *id)
 379 {
 380         struct usb_device *dev = interface_to_usbdev(intf);
 381         struct usb_host_interface *interface = intf->cur_altsetting;
 382         struct usb_endpoint_descriptor *endpoint;
 383         struct wacom *wacom;
 384         struct wacom_wac *wacom_wac;
 385         struct wacom_features *features;
 386         struct input_dev *input_dev;
 387         int error = -ENOMEM;
 388         char rep_data[2], limit = 0;
 389         struct hid_descriptor *hid_desc;
 390
 391         wacom = kzalloc(sizeof(struct wacom), GFP_KERNEL);
 392         wacom_wac = kzalloc(sizeof(struct wacom_wac), GFP_KERNEL);
 393         input_dev = input_allocate_device();
 394         if (!wacom || !input_dev || !wacom_wac)
 395                 goto fail1;
 396
 397         wacom_wac->data = usb_buffer_alloc(dev, 10, GFP_KERNEL, &wacom->data_dma);
 398         if (!wacom_wac->data)
 399                 goto fail1;
 400
 401         wacom->irq = usb_alloc_urb(0, GFP_KERNEL);
 402         if (!wacom->irq)
 403                 goto fail2;
 404
 405         wacom->usbdev = dev;
 406         wacom->dev = input_dev;
 407         wacom->intf = intf;
 408         mutex_init(&wacom->lock);
 409         usb_make_path(dev, wacom->phys, sizeof(wacom->phys));
 410         strlcat(wacom->phys, "/input0", sizeof(wacom->phys));
 411
 412         wacom_wac->features = features = get_wacom_feature(id);
 413         BUG_ON(features->pktlen > 10);
 414
 415         input_dev->name = wacom_wac->features->name;
 416         wacom->wacom_wac = wacom_wac;
 417         usb_to_input_id(dev, &input_dev->id);
 418
 419         input_dev->dev.parent = &intf->dev;
 420
 421         input_set_drvdata(input_dev, wacom);
 422
 423         input_dev->open = wacom_open;
 424         input_dev->close = wacom_close;
 425
 426         endpoint = &intf->cur_altsetting->endpoint[0].desc;
 427
 428         /* Initialize touch_x_max and touch_y_max in case it is not defined */
 429         if (wacom_wac->features->type == TABLETPC) {
 430                 features->touch_x_max = 1023;
 431                 features->touch_y_max = 1023;
 432         } else {
 433                 features->touch_x_max = 0;
 434                 features->touch_y_max = 0;
 435         }
 436
 437         /* TabletPC need to retrieve the physical and logical maximum from report descriptor */
 438         if (wacom_wac->features->type == TABLETPC) {
 439                 if (usb_get_extra_descriptor(interface, HID_DEVICET_HID, &hid_desc)) {
 440                         if (usb_get_extra_descriptor(&interface->endpoint[0],
 441                                                      HID_DEVICET_REPORT, &hid_desc)) {
 442                                 printk("wacom: can not retrive extra class descriptor\n");
 443                                 goto fail2;
 444                         }
 445                 }
 446                 error = wacom_parse_hid(intf, hid_desc, wacom_wac);
 447                 if (error)
 448                         goto fail2;
 449         }
 450
 451         input_dev->evbit[0] |= BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS);
 452         input_dev->keybit[BIT_WORD(BTN_DIGI)] |= BIT_MASK(BTN_TOOL_PEN) |
 453                 BIT_MASK(BTN_TOUCH) | BIT_MASK(BTN_STYLUS);
 454         input_set_abs_params(input_dev, ABS_X, 0, features->x_max, 4, 0);
 455         input_set_abs_params(input_dev, ABS_Y, 0, features->y_max, 4, 0);
 456         input_set_abs_params(input_dev, ABS_PRESSURE, 0, features->pressure_max, 0, 0);
 457         if (features->type == TABLETPC) {
 458                 input_dev->keybit[BIT_WORD(BTN_DIGI)] |= BIT_MASK(BTN_TOOL_DOUBLETAP);
 459                 input_set_abs_params(input_dev, ABS_RX, 0, features->touch_x_max, 4, 0);
 460                 input_set_abs_params(input_dev, ABS_RY, 0, features->touch_y_max, 4, 0);
 461         }
 462         input_dev->absbit[BIT_WORD(ABS_MISC)] |= BIT_MASK(ABS_MISC);
 463
 464         wacom_init_input_dev(input_dev, wacom_wac);
 465
 466         usb_fill_int_urb(wacom->irq, dev,
 467                          usb_rcvintpipe(dev, endpoint->bEndpointAddress),
 468                          wacom_wac->data, wacom_wac->features->pktlen,
 469                          wacom_sys_irq, wacom, endpoint->bInterval);
 470         wacom->irq->transfer_dma = wacom->data_dma;
 471         wacom->irq->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
 472
 473         error = input_register_device(wacom->dev);
 474         if (error)
 475                 goto fail3;
 476
 477         /*
 478          * Ask the tablet to report tablet data if it is not a Tablet PC.
 479          * Repeat until it succeeds
 480          */
 481         if (wacom_wac->features->type != TABLETPC) {
 482                 do {
 483                         rep_data[0] = 2;
 484                         rep_data[1] = 2;
 485                         error = usb_set_report(intf, WAC_HID_FEATURE_REPORT,
 486                                                 2, rep_data, 2);
 487                         if (error >= 0)
 488                                 error = usb_get_report(intf,
 489                                                 WAC_HID_FEATURE_REPORT, 2,
 490                                                 rep_data, 2);
 491                 } while ((error < 0 || rep_data[1] != 2) && limit++ < 5);
 492         }
 493
 494         usb_set_intfdata(intf, wacom);
 495         return 0;
 496
 497  fail3: usb_free_urb(wacom->irq);
 498  fail2: usb_buffer_free(dev, 10, wacom_wac->data, wacom->data_dma);
 499  fail1: input_free_device(input_dev);
 500         kfree(wacom);
 501         kfree(wacom_wac);
 502         return error;
 503 }
 504
 505 static void wacom_disconnect(struct usb_interface *intf)
 506 {
 507         struct wacom *wacom = usb_get_intfdata(intf);
 508
 509         usb_set_intfdata(intf, NULL);
 510
 511         usb_kill_urb(wacom->irq);
 512         input_unregister_device(wacom->dev);
 513         usb_free_urb(wacom->irq);
 514         usb_buffer_free(interface_to_usbdev(intf), 10,
 515                         wacom->wacom_wac->data, wacom->data_dma);
 516         kfree(wacom->wacom_wac);
 517         kfree(wacom);
 518 }
 519
 520 static int wacom_suspend(struct usb_interface *intf, pm_message_t message)
 521 {
 522         struct wacom *wacom = usb_get_intfdata(intf);
 523
 524         mutex_lock(&wacom->lock);
 525         usb_kill_urb(wacom->irq);
 526         mutex_unlock(&wacom->lock);
 527
 528         return 0;
 529 }
 530
 531 static int wacom_resume(struct usb_interface *intf)
 532 {
 533         struct wacom *wacom = usb_get_intfdata(intf);
 534         int rv;
 535
 536         mutex_lock(&wacom->lock);
 537         if (wacom->open)
 538                 rv = usb_submit_urb(wacom->irq, GFP_NOIO);
 539         else
 540                 rv = 0;
 541         mutex_unlock(&wacom->lock);
 542
 543         return rv;
 544 }
 545
 546 static int wacom_reset_resume(struct usb_interface *intf)
 547 {
 548         return wacom_resume(intf);
 549 }
 550
 551 static struct usb_driver wacom_driver = {
 552         .name =         "wacom",
 553         .probe =        wacom_probe,
 554         .disconnect =   wacom_disconnect,
 555         .suspend =      wacom_suspend,
 556         .resume =       wacom_resume,
 557         .reset_resume = wacom_reset_resume,
 558         .supports_autosuspend = 1,
 559 };
 560
 561 static int __init wacom_init(void)
 562 {
 563         int result;
 564         wacom_driver.id_table = get_device_table();
 565         result = usb_register(&wacom_driver);
 566         if (result == 0)
 567                 printk(KERN_INFO KBUILD_MODNAME ": " DRIVER_VERSION ":"
 568                        DRIVER_DESC "\n");
 569         return result;
 570 }
 571
 572 static void __exit wacom_exit(void)
 573 {
 574         usb_deregister(&wacom_driver);
 575 }
 576
 577 module_init(wacom_init);
 578 module_exit(wacom_exit);