drivers/input/tablet/wacom_serial4.c

   1 /*
   2  * Wacom protocol 4 serial tablet driver
   3  *
   4  * Copyright 2014      Hans de Goede <hdegoede@redhat.com>
   5  * Copyright 2011-2012 Julian Squires <julian@cipht.net>
   6  *
   7  * This program is free software; you can redistribute it and/or modify it
   8  * under the terms of the GNU General Public License as published by the
   9  * Free Software Foundation; either version of 2 of the License, or (at your
  10  * option) any later version. See the file COPYING in the main directory of
  11  * this archive for more details.
  12  *
  13  * Many thanks to Bill Seremetis, without whom PenPartner support
  14  * would not have been possible. Thanks to Patrick Mahoney.
  15  *
  16  * This driver was developed with reference to much code written by others,
  17  * particularly:
  18  *  - elo, gunze drivers by Vojtech Pavlik <vojtech@ucw.cz>;
  19  *  - wacom_w8001 driver by Jaya Kumar <jayakumar.lkml@gmail.com>;
  20  *  - the USB wacom input driver, credited to many people
  21  *    (see drivers/input/tablet/wacom.h);
  22  *  - new and old versions of linuxwacom / xf86-input-wacom credited to
  23  *    Frederic Lepied, France. <Lepied@XFree86.org> and
  24  *    Ping Cheng, Wacom. <pingc@wacom.com>;
  25  *  - and xf86wacom.c (a presumably ancient version of the linuxwacom code),
  26  *    by Frederic Lepied and Raph Levien <raph@gtk.org>.
  27  *
  28  * To do:
  29  *  - support pad buttons; (requires access to a model with pad buttons)
  30  *  - support (protocol 4-style) tilt (requires access to a > 1.4 rom model)
  31  */
  32
  33 /*
  34  * Wacom serial protocol 4 documentation taken from linuxwacom-0.9.9 code,
  35  * protocol 4 uses 7 or 9 byte of data in the following format:
  36  *
  37  *      Byte 1
  38  *      bit 7  Sync bit always 1
  39  *      bit 6  Pointing device detected
  40  *      bit 5  Cursor = 0 / Stylus = 1
  41  *      bit 4  Reserved
  42  *      bit 3  1 if a button on the pointing device has been pressed
  43  *      bit 2  P0 (optional)
  44  *      bit 1  X15
  45  *      bit 0  X14
  46  *
  47  *      Byte 2
  48  *      bit 7  Always 0
  49  *      bits 6-0 = X13 - X7
  50  *
  51  *      Byte 3
  52  *      bit 7  Always 0
  53  *      bits 6-0 = X6 - X0
  54  *
  55  *      Byte 4
  56  *      bit 7  Always 0
  57  *      bit 6  B3
  58  *      bit 5  B2
  59  *      bit 4  B1
  60  *      bit 3  B0
  61  *      bit 2  P1 (optional)
  62  *      bit 1  Y15
  63  *      bit 0  Y14
  64  *
  65  *      Byte 5
  66  *      bit 7  Always 0
  67  *      bits 6-0 = Y13 - Y7
  68  *
  69  *      Byte 6
  70  *      bit 7  Always 0
  71  *      bits 6-0 = Y6 - Y0
  72  *
  73  *      Byte 7
  74  *      bit 7 Always 0
  75  *      bit 6  Sign of pressure data; or wheel-rel for cursor tool
  76  *      bit 5  P7; or REL1 for cursor tool
  77  *      bit 4  P6; or REL0 for cursor tool
  78  *      bit 3  P5
  79  *      bit 2  P4
  80  *      bit 1  P3
  81  *      bit 0  P2
  82  *
  83  *      byte 8 and 9 are optional and present only
  84  *      in tilt mode.
  85  *
  86  *      Byte 8
  87  *      bit 7 Always 0
  88  *      bit 6 Sign of tilt X
  89  *      bit 5  Xt6
  90  *      bit 4  Xt5
  91  *      bit 3  Xt4
  92  *      bit 2  Xt3
  93  *      bit 1  Xt2
  94  *      bit 0  Xt1
  95  *
  96  *      Byte 9
  97  *      bit 7 Always 0
  98  *      bit 6 Sign of tilt Y
  99  *      bit 5  Yt6
 100  *      bit 4  Yt5
 101  *      bit 3  Yt4
 102  *      bit 2  Yt3
 103  *      bit 1  Yt2
 104  *      bit 0  Yt1
 105  */
 106
 107 #include <linux/completion.h>
 108 #include <linux/init.h>
 109 #include <linux/input.h>
 110 #include <linux/interrupt.h>
 111 #include <linux/kernel.h>
 112 #include <linux/module.h>
 113 #include <linux/serio.h>
 114 #include <linux/slab.h>
 115 #include <linux/string.h>
 116
 117 MODULE_AUTHOR("Julian Squires <julian@cipht.net>, Hans de Goede <hdegoede@redhat.com>");
 118 MODULE_DESCRIPTION("Wacom protocol 4 serial tablet driver");
 119 MODULE_LICENSE("GPL");
 120
 121 #define REQUEST_MODEL_AND_ROM_VERSION   "~#"
 122 #define REQUEST_MAX_COORDINATES         "~C\r"
 123 #define REQUEST_CONFIGURATION_STRING    "~R\r"
 124 #define REQUEST_RESET_TO_PROTOCOL_IV    "\r#"
 125 /*
 126  * Note: sending "\r$\r" causes at least the Digitizer II to send
 127  * packets in ASCII instead of binary.  "\r#" seems to undo that.
 128  */
 129
 130 #define COMMAND_START_SENDING_PACKETS           "ST\r"
 131 #define COMMAND_STOP_SENDING_PACKETS            "SP\r"
 132 #define COMMAND_MULTI_MODE_INPUT                "MU1\r"
 133 #define COMMAND_ORIGIN_IN_UPPER_LEFT            "OC1\r"
 134 #define COMMAND_ENABLE_ALL_MACRO_BUTTONS        "~M0\r"
 135 #define COMMAND_DISABLE_GROUP_1_MACRO_BUTTONS   "~M1\r"
 136 #define COMMAND_TRANSMIT_AT_MAX_RATE            "IT0\r"
 137 #define COMMAND_DISABLE_INCREMENTAL_MODE        "IN0\r"
 138 #define COMMAND_ENABLE_CONTINUOUS_MODE          "SR\r"
 139 #define COMMAND_ENABLE_PRESSURE_MODE            "PH1\r"
 140 #define COMMAND_Z_FILTER                        "ZF1\r"
 141
 142 /* Note that this is a protocol 4 packet without tilt information. */
 143 #define PACKET_LENGTH           7
 144 #define DATA_SIZE               32
 145
 146 /* flags */
 147 #define F_COVERS_SCREEN         0x01
 148 #define F_HAS_STYLUS2           0x02
 149 #define F_HAS_SCROLLWHEEL       0x04
 150
 151 /* device IDs */
 152 #define STYLUS_DEVICE_ID        0x02
 153 #define CURSOR_DEVICE_ID        0x06
 154 #define ERASER_DEVICE_ID        0x0A
 155
 156 enum { STYLUS = 1, ERASER, CURSOR };
 157
 158 static const struct {
 159         int device_id;
 160         int input_id;
 161 } tools[] = {
 162         { 0, 0 },
 163         { STYLUS_DEVICE_ID, BTN_TOOL_PEN },
 164         { ERASER_DEVICE_ID, BTN_TOOL_RUBBER },
 165         { CURSOR_DEVICE_ID, BTN_TOOL_MOUSE },
 166 };
 167
 168 struct wacom {
 169         struct input_dev *dev;
 170         struct completion cmd_done;
 171         int result;
 172         u8 expect;
 173         u8 eraser_mask;
 174         unsigned int extra_z_bits;
 175         unsigned int flags;
 176         unsigned int res_x, res_y;
 177         unsigned int max_x, max_y;
 178         unsigned int tool;
 179         unsigned int idx;
 180         u8 data[DATA_SIZE];
 181         char phys[32];
 182 };
 183
 184 enum {
 185         MODEL_CINTIQ            = 0x504C, /* PL */
 186         MODEL_CINTIQ2           = 0x4454, /* DT */
 187         MODEL_DIGITIZER_II      = 0x5544, /* UD */
 188         MODEL_GRAPHIRE          = 0x4554, /* ET */
 189         MODEL_PENPARTNER        = 0x4354, /* CT */
 190 };
 191
 192 static void wacom_handle_model_response(struct wacom *wacom)
 193 {
 194         int major_v, minor_v, r = 0;
 195         char *p;
 196
 197         p = strrchr(wacom->data, 'V');
 198         if (p)
 199                 r = sscanf(p + 1, "%u.%u", &major_v, &minor_v);
 200         if (r != 2)
 201                 major_v = minor_v = 0;
 202
 203         switch (wacom->data[2] << 8 | wacom->data[3]) {
 204         case MODEL_CINTIQ:      /* UNTESTED */
 205         case MODEL_CINTIQ2:
 206                 if ((wacom->data[2] << 8 | wacom->data[3]) == MODEL_CINTIQ) {
 207                         wacom->dev->name = "Wacom Cintiq";
 208                         wacom->dev->id.version = MODEL_CINTIQ;
 209                 } else {
 210                         wacom->dev->name = "Wacom Cintiq II";
 211                         wacom->dev->id.version = MODEL_CINTIQ2;
 212                 }
 213                 wacom->res_x = 508;
 214                 wacom->res_y = 508;
 215
 216                 switch (wacom->data[5] << 8 | wacom->data[6]) {
 217                 case 0x3731: /* PL-710 */
 218                         wacom->res_x = 2540;
 219                         wacom->res_y = 2540;
 220                         /* fall through */
 221                 case 0x3535: /* PL-550 */
 222                 case 0x3830: /* PL-800 */
 223                         wacom->extra_z_bits = 2;
 224                 }
 225
 226                 wacom->flags = F_COVERS_SCREEN;
 227                 break;
 228
 229         case MODEL_PENPARTNER:
 230                 wacom->dev->name = "Wacom Penpartner";
 231                 wacom->dev->id.version = MODEL_PENPARTNER;
 232                 wacom->res_x = 1000;
 233                 wacom->res_y = 1000;
 234                 break;
 235
 236         case MODEL_GRAPHIRE:
 237                 wacom->dev->name = "Wacom Graphire";
 238                 wacom->dev->id.version = MODEL_GRAPHIRE;
 239                 wacom->res_x = 1016;
 240                 wacom->res_y = 1016;
 241                 wacom->max_x = 5103;
 242                 wacom->max_y = 3711;
 243                 wacom->extra_z_bits = 2;
 244                 wacom->eraser_mask = 0x08;
 245                 wacom->flags = F_HAS_STYLUS2 | F_HAS_SCROLLWHEEL;
 246                 break;
 247
 248         case MODEL_DIGITIZER_II:
 249                 wacom->dev->name = "Wacom Digitizer II";
 250                 wacom->dev->id.version = MODEL_DIGITIZER_II;
 251                 if (major_v == 1 && minor_v <= 2)
 252                         wacom->extra_z_bits = 0; /* UNTESTED */
 253                 break;
 254
 255         default:
 256                 dev_err(&wacom->dev->dev, "Unsupported Wacom model %s\n",
 257                         wacom->data);
 258                 wacom->result = -ENODEV;
 259                 return;
 260         }
 261
 262         dev_info(&wacom->dev->dev, "%s tablet, version %u.%u\n",
 263                  wacom->dev->name, major_v, minor_v);
 264 }
 265
 266 static void wacom_handle_configuration_response(struct wacom *wacom)
 267 {
 268         int r, skip;
 269
 270         dev_dbg(&wacom->dev->dev, "Configuration string: %s\n", wacom->data);
 271         r = sscanf(wacom->data, "~R%x,%u,%u,%u,%u", &skip, &skip, &skip,
 272                    &wacom->res_x, &wacom->res_y);
 273         if (r != 5)
 274                 dev_warn(&wacom->dev->dev, "could not get resolution\n");
 275 }
 276
 277 static void wacom_handle_coordinates_response(struct wacom *wacom)
 278 {
 279         int r;
 280
 281         dev_dbg(&wacom->dev->dev, "Coordinates string: %s\n", wacom->data);
 282         r = sscanf(wacom->data, "~C%u,%u", &wacom->max_x, &wacom->max_y);
 283         if (r != 2)
 284                 dev_warn(&wacom->dev->dev, "could not get max coordinates\n");
 285 }
 286
 287 static void wacom_handle_response(struct wacom *wacom)
 288 {
 289         if (wacom->data[0] != '~' || wacom->data[1] != wacom->expect) {
 290                 dev_err(&wacom->dev->dev,
 291                         "Wacom got an unexpected response: %s\n", wacom->data);
 292                 wacom->result = -EIO;
 293         } else {
 294                 wacom->result = 0;
 295
 296                 switch (wacom->data[1]) {
 297                 case '#':
 298                         wacom_handle_model_response(wacom);
 299                         break;
 300                 case 'R':
 301                         wacom_handle_configuration_response(wacom);
 302                         break;
 303                 case 'C':
 304                         wacom_handle_coordinates_response(wacom);
 305                         break;
 306                 }
 307         }
 308
 309         complete(&wacom->cmd_done);
 310 }
 311
 312 static void wacom_handle_packet(struct wacom *wacom)
 313 {
 314         u8 in_proximity_p, stylus_p, button;
 315         unsigned int tool;
 316         int x, y, z;
 317
 318         in_proximity_p = wacom->data[0] & 0x40;
 319         stylus_p = wacom->data[0] & 0x20;
 320         button = (wacom->data[3] & 0x78) >> 3;
 321         x = (wacom->data[0] & 3) << 14 | wacom->data[1]<<7 | wacom->data[2];
 322         y = (wacom->data[3] & 3) << 14 | wacom->data[4]<<7 | wacom->data[5];
 323
 324         if (in_proximity_p && stylus_p) {
 325                 z = wacom->data[6] & 0x7f;
 326                 if (wacom->extra_z_bits >= 1)
 327                         z = z << 1 | (wacom->data[3] & 0x4) >> 2;
 328                 if (wacom->extra_z_bits > 1)
 329                         z = z << 1 | (wacom->data[0] & 0x4) >> 2;
 330                 z = z ^ (0x40 << wacom->extra_z_bits);
 331         } else {
 332                 z = -1;
 333         }
 334
 335         if (stylus_p)
 336                 tool = (button & wacom->eraser_mask) ? ERASER : STYLUS;
 337         else
 338                 tool = CURSOR;
 339
 340         if (tool != wacom->tool && wacom->tool != 0) {
 341                 input_report_key(wacom->dev, tools[wacom->tool].input_id, 0);
 342                 input_sync(wacom->dev);
 343         }
 344         wacom->tool = tool;
 345
 346         input_report_key(wacom->dev, tools[tool].input_id, in_proximity_p);
 347         input_report_abs(wacom->dev, ABS_MISC,
 348                          in_proximity_p ? tools[tool].device_id : 0);
 349         input_report_abs(wacom->dev, ABS_X, x);
 350         input_report_abs(wacom->dev, ABS_Y, y);
 351         input_report_abs(wacom->dev, ABS_PRESSURE, z);
 352         if (stylus_p) {
 353                 input_report_key(wacom->dev, BTN_TOUCH, button & 1);
 354                 input_report_key(wacom->dev, BTN_STYLUS, button & 2);
 355                 input_report_key(wacom->dev, BTN_STYLUS2, button & 4);
 356         } else {
 357                 input_report_key(wacom->dev, BTN_LEFT, button & 1);
 358                 input_report_key(wacom->dev, BTN_RIGHT, button & 2);
 359                 input_report_key(wacom->dev, BTN_MIDDLE, button & 4);
 360                 /* handle relative wheel for non-stylus device */
 361                 z = (wacom->data[6] & 0x30) >> 4;
 362                 if (wacom->data[6] & 0x40)
 363                         z = -z;
 364                 input_report_rel(wacom->dev, REL_WHEEL, z);
 365         }
 366         input_sync(wacom->dev);
 367 }
 368
 369 static void wacom_clear_data_buf(struct wacom *wacom)
 370 {
 371         memset(wacom->data, 0, DATA_SIZE);
 372         wacom->idx = 0;
 373 }
 374
 375 static irqreturn_t wacom_interrupt(struct serio *serio, unsigned char data,
 376                                    unsigned int flags)
 377 {
 378         struct wacom *wacom = serio_get_drvdata(serio);
 379
 380         if (data & 0x80)
 381                 wacom->idx = 0;
 382
 383         /*
 384          * We're either expecting a carriage return-terminated ASCII
 385          * response string, or a seven-byte packet with the MSB set on
 386          * the first byte.
 387          *
 388          * Note however that some tablets (the PenPartner, for
 389          * example) don't send a carriage return at the end of a
 390          * command.  We handle these by waiting for timeout.
 391          */
 392         if (data == '\r' && !(wacom->data[0] & 0x80)) {
 393                 wacom_handle_response(wacom);
 394                 wacom_clear_data_buf(wacom);
 395                 return IRQ_HANDLED;
 396         }
 397
 398         /* Leave place for 0 termination */
 399         if (wacom->idx > (DATA_SIZE - 2)) {
 400                 dev_dbg(&wacom->dev->dev,
 401                         "throwing away %d bytes of garbage\n", wacom->idx);
 402                 wacom_clear_data_buf(wacom);
 403         }
 404         wacom->data[wacom->idx++] = data;
 405
 406         if (wacom->idx == PACKET_LENGTH && (wacom->data[0] & 0x80)) {
 407                 wacom_handle_packet(wacom);
 408                 wacom_clear_data_buf(wacom);
 409         }
 410
 411         return IRQ_HANDLED;
 412 }
 413
 414 static void wacom_disconnect(struct serio *serio)
 415 {
 416         struct wacom *wacom = serio_get_drvdata(serio);
 417
 418         serio_close(serio);
 419         serio_set_drvdata(serio, NULL);
 420         input_unregister_device(wacom->dev);
 421         kfree(wacom);
 422 }
 423
 424 static int wacom_send(struct serio *serio, const u8 *command)
 425 {
 426         int err = 0;
 427
 428         for (; !err && *command; command++)
 429                 err = serio_write(serio, *command);
 430
 431         return err;
 432 }
 433
 434 static int wacom_send_setup_string(struct wacom *wacom, struct serio *serio)
 435 {
 436         const u8 *cmd;
 437
 438         switch (wacom->dev->id.version) {
 439         case MODEL_CINTIQ:      /* UNTESTED */
 440                 cmd = COMMAND_ORIGIN_IN_UPPER_LEFT
 441                         COMMAND_TRANSMIT_AT_MAX_RATE
 442                         COMMAND_ENABLE_CONTINUOUS_MODE
 443                         COMMAND_START_SENDING_PACKETS;
 444                 break;
 445
 446         case MODEL_PENPARTNER:
 447                 cmd = COMMAND_ENABLE_PRESSURE_MODE
 448                         COMMAND_START_SENDING_PACKETS;
 449                 break;
 450
 451         default:
 452                 cmd = COMMAND_MULTI_MODE_INPUT
 453                         COMMAND_ORIGIN_IN_UPPER_LEFT
 454                         COMMAND_ENABLE_ALL_MACRO_BUTTONS
 455                         COMMAND_DISABLE_GROUP_1_MACRO_BUTTONS
 456                         COMMAND_TRANSMIT_AT_MAX_RATE
 457                         COMMAND_DISABLE_INCREMENTAL_MODE
 458                         COMMAND_ENABLE_CONTINUOUS_MODE
 459                         COMMAND_Z_FILTER
 460                         COMMAND_START_SENDING_PACKETS;
 461                 break;
 462         }
 463
 464         return wacom_send(serio, cmd);
 465 }
 466
 467 static int wacom_send_and_wait(struct wacom *wacom, struct serio *serio,
 468                                const u8 *cmd, const char *desc)
 469 {
 470         int err;
 471         unsigned long u;
 472
 473         wacom->expect = cmd[1];
 474         init_completion(&wacom->cmd_done);
 475
 476         err = wacom_send(serio, cmd);
 477         if (err)
 478                 return err;
 479
 480         u = wait_for_completion_timeout(&wacom->cmd_done, HZ);
 481         if (u == 0) {
 482                 /* Timeout, process what we've received. */
 483                 wacom_handle_response(wacom);
 484         }
 485
 486         wacom->expect = 0;
 487         return wacom->result;
 488 }
 489
 490 static int wacom_setup(struct wacom *wacom, struct serio *serio)
 491 {
 492         int err;
 493
 494         /* Note that setting the link speed is the job of inputattach.
 495          * We assume that reset negotiation has already happened,
 496          * here. */
 497         err = wacom_send_and_wait(wacom, serio, REQUEST_MODEL_AND_ROM_VERSION,
 498                                   "model and version");
 499         if (err)
 500                 return err;
 501
 502         if (!(wacom->res_x && wacom->res_y)) {
 503                 err = wacom_send_and_wait(wacom, serio,
 504                                           REQUEST_CONFIGURATION_STRING,
 505                                           "configuration string");
 506                 if (err)
 507                         return err;
 508         }
 509
 510         if (!(wacom->max_x && wacom->max_y)) {
 511                 err = wacom_send_and_wait(wacom, serio,
 512                                           REQUEST_MAX_COORDINATES,
 513                                           "coordinates string");
 514                 if (err)
 515                         return err;
 516         }
 517
 518         return wacom_send_setup_string(wacom, serio);
 519 }
 520
 521 static int wacom_connect(struct serio *serio, struct serio_driver *drv)
 522 {
 523         struct wacom *wacom;
 524         struct input_dev *input_dev;
 525         int err = -ENOMEM;
 526
 527         wacom = kzalloc(sizeof(struct wacom), GFP_KERNEL);
 528         input_dev = input_allocate_device();
 529         if (!wacom || !input_dev)
 530                 goto free_device;
 531
 532         wacom->dev = input_dev;
 533         wacom->extra_z_bits = 1;
 534         wacom->eraser_mask = 0x04;
 535         wacom->tool = wacom->idx = 0;
 536         snprintf(wacom->phys, sizeof(wacom->phys), "%s/input0", serio->phys);
 537         input_dev->phys = wacom->phys;
 538         input_dev->id.bustype = BUS_RS232;
 539         input_dev->id.vendor  = SERIO_WACOM_IV;
 540         input_dev->id.product = serio->id.extra;
 541         input_dev->dev.parent = &serio->dev;
 542
 543         input_dev->evbit[0] =
 544                 BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS) | BIT_MASK(EV_REL);
 545         set_bit(ABS_MISC, input_dev->absbit);
 546         set_bit(BTN_TOOL_PEN, input_dev->keybit);
 547         set_bit(BTN_TOOL_RUBBER, input_dev->keybit);
 548         set_bit(BTN_TOOL_MOUSE, input_dev->keybit);
 549         set_bit(BTN_TOUCH, input_dev->keybit);
 550         set_bit(BTN_STYLUS, input_dev->keybit);
 551         set_bit(BTN_LEFT, input_dev->keybit);
 552         set_bit(BTN_RIGHT, input_dev->keybit);
 553         set_bit(BTN_MIDDLE, input_dev->keybit);
 554
 555         serio_set_drvdata(serio, wacom);
 556
 557         err = serio_open(serio, drv);
 558         if (err)
 559                 goto free_device;
 560
 561         err = wacom_setup(wacom, serio);
 562         if (err)
 563                 goto close_serio;
 564
 565         set_bit(INPUT_PROP_DIRECT, input_dev->propbit);
 566         if (!(wacom->flags & F_COVERS_SCREEN))
 567                 __set_bit(INPUT_PROP_POINTER, input_dev->propbit);
 568
 569         if (wacom->flags & F_HAS_STYLUS2)
 570                 __set_bit(BTN_STYLUS2, input_dev->keybit);
 571
 572         if (wacom->flags & F_HAS_SCROLLWHEEL)
 573                 __set_bit(REL_WHEEL, input_dev->relbit);
 574
 575         input_abs_set_res(wacom->dev, ABS_X, wacom->res_x);
 576         input_abs_set_res(wacom->dev, ABS_Y, wacom->res_y);
 577         input_set_abs_params(wacom->dev, ABS_X, 0, wacom->max_x, 0, 0);
 578         input_set_abs_params(wacom->dev, ABS_Y, 0, wacom->max_y, 0, 0);
 579         input_set_abs_params(wacom->dev, ABS_PRESSURE, -1,
 580                              (1 << (7 + wacom->extra_z_bits)) - 1, 0, 0);
 581
 582         err = input_register_device(wacom->dev);
 583         if (err)
 584                 goto close_serio;
 585
 586         return 0;
 587
 588 close_serio:
 589         serio_close(serio);
 590 free_device:
 591         serio_set_drvdata(serio, NULL);
 592         input_free_device(input_dev);
 593         kfree(wacom);
 594         return err;
 595 }
 596
 597 static struct serio_device_id wacom_serio_ids[] = {
 598         {
 599                 .type   = SERIO_RS232,
 600                 .proto  = SERIO_WACOM_IV,
 601                 .id     = SERIO_ANY,
 602                 .extra  = SERIO_ANY,
 603         },
 604         { 0 }
 605 };
 606
 607 MODULE_DEVICE_TABLE(serio, wacom_serio_ids);
 608
 609 static struct serio_driver wacom_drv = {
 610         .driver         = {
 611                 .name   = "wacom_serial4",
 612         },
 613         .description    = "Wacom protocol 4 serial tablet driver",
 614         .id_table       = wacom_serio_ids,
 615         .interrupt      = wacom_interrupt,
 616         .connect        = wacom_connect,
 617         .disconnect     = wacom_disconnect,
 618 };
 619
 620 module_serio_driver(wacom_drv);