linux/drivers/input/tablet/wacom_serial4.c
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   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
 117MODULE_AUTHOR("Julian Squires <julian@cipht.net>, Hans de Goede <hdegoede@redhat.com>");
 118MODULE_DESCRIPTION("Wacom protocol 4 serial tablet driver");
 119MODULE_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
 156enum { STYLUS = 1, ERASER, CURSOR };
 157
 158static 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
 168struct 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
 184enum {
 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
 192static 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
 266static 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
 277static 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
 287static 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
 312static 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
 369static void wacom_clear_data_buf(struct wacom *wacom)
 370{
 371        memset(wacom->data, 0, DATA_SIZE);
 372        wacom->idx = 0;
 373}
 374
 375static 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
 414static 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
 424static 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
 434static 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
 467static 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
 490static 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
 521static 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
 588close_serio:
 589        serio_close(serio);
 590free_device:
 591        serio_set_drvdata(serio, NULL);
 592        input_free_device(input_dev);
 593        kfree(wacom);
 594        return err;
 595}
 596
 597static 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
 607MODULE_DEVICE_TABLE(serio, wacom_serio_ids);
 608
 609static 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
 620module_serio_driver(wacom_drv);
 621
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