drivers/input/tablet/wacom

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This source file includes following definitions.
wacom_handle_model_response
wacom_handle_configuration_response
wacom_handle_coordinates_response
wacom_handle_response
wacom_handle_packet
wacom_clear_data_buf
wacom_interrupt
wacom_disconnect
wacom_send
wacom_send_setup_string
wacom_send_and_wait
wacom_setup
wacom_connect
   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * Wacom protocol 4 serial tablet driver
   4  *
   5  * Copyright 2014      Hans de Goede <hdegoede@redhat.com>
   6  * Copyright 2011-2012 Julian Squires <julian@cipht.net>
   7  *
   8  * Many thanks to Bill Seremetis, without whom PenPartner support
   9  * would not have been possible. Thanks to Patrick Mahoney.
  10  *
  11  * This driver was developed with reference to much code written by others,
  12  * particularly:
  13  *  - elo, gunze drivers by Vojtech Pavlik <vojtech@ucw.cz>;
  14  *  - wacom_w8001 driver by Jaya Kumar <jayakumar.lkml@gmail.com>;
  15  *  - the USB wacom input driver, credited to many people
  16  *    (see drivers/input/tablet/wacom.h);
  17  *  - new and old versions of linuxwacom / xf86-input-wacom credited to
  18  *    Frederic Lepied, France. <Lepied@XFree86.org> and
  19  *    Ping Cheng, Wacom. <pingc@wacom.com>;
  20  *  - and xf86wacom.c (a presumably ancient version of the linuxwacom code),
  21  *    by Frederic Lepied and Raph Levien <raph@gtk.org>.
  22  *
  23  * To do:
  24  *  - support pad buttons; (requires access to a model with pad buttons)
  25  *  - support (protocol 4-style) tilt (requires access to a > 1.4 rom model)
  26  */
  27 
  28 /*
  29  * Wacom serial protocol 4 documentation taken from linuxwacom-0.9.9 code,
  30  * protocol 4 uses 7 or 9 byte of data in the following format:
  31  *
  32  *      Byte 1
  33  *      bit 7  Sync bit always 1
  34  *      bit 6  Pointing device detected
  35  *      bit 5  Cursor = 0 / Stylus = 1
  36  *      bit 4  Reserved
  37  *      bit 3  1 if a button on the pointing device has been pressed
  38  *      bit 2  P0 (optional)
  39  *      bit 1  X15
  40  *      bit 0  X14
  41  *
  42  *      Byte 2
  43  *      bit 7  Always 0
  44  *      bits 6-0 = X13 - X7
  45  *
  46  *      Byte 3
  47  *      bit 7  Always 0
  48  *      bits 6-0 = X6 - X0
  49  *
  50  *      Byte 4
  51  *      bit 7  Always 0
  52  *      bit 6  B3
  53  *      bit 5  B2
  54  *      bit 4  B1
  55  *      bit 3  B0
  56  *      bit 2  P1 (optional)
  57  *      bit 1  Y15
  58  *      bit 0  Y14
  59  *
  60  *      Byte 5
  61  *      bit 7  Always 0
  62  *      bits 6-0 = Y13 - Y7
  63  *
  64  *      Byte 6
  65  *      bit 7  Always 0
  66  *      bits 6-0 = Y6 - Y0
  67  *
  68  *      Byte 7
  69  *      bit 7 Always 0
  70  *      bit 6  Sign of pressure data; or wheel-rel for cursor tool
  71  *      bit 5  P7; or REL1 for cursor tool
  72  *      bit 4  P6; or REL0 for cursor tool
  73  *      bit 3  P5
  74  *      bit 2  P4
  75  *      bit 1  P3
  76  *      bit 0  P2
  77  *
  78  *      byte 8 and 9 are optional and present only
  79  *      in tilt mode.
  80  *
  81  *      Byte 8
  82  *      bit 7 Always 0
  83  *      bit 6 Sign of tilt X
  84  *      bit 5  Xt6
  85  *      bit 4  Xt5
  86  *      bit 3  Xt4
  87  *      bit 2  Xt3
  88  *      bit 1  Xt2
  89  *      bit 0  Xt1
  90  *
  91  *      Byte 9
  92  *      bit 7 Always 0
  93  *      bit 6 Sign of tilt Y
  94  *      bit 5  Yt6
  95  *      bit 4  Yt5
  96  *      bit 3  Yt4
  97  *      bit 2  Yt3
  98  *      bit 1  Yt2
  99  *      bit 0  Yt1
 100  */
 101 
 102 #include <linux/completion.h>
 103 #include <linux/init.h>
 104 #include <linux/input.h>
 105 #include <linux/interrupt.h>
 106 #include <linux/kernel.h>
 107 #include <linux/module.h>
 108 #include <linux/serio.h>
 109 #include <linux/slab.h>
 110 #include <linux/string.h>
 111 
 112 MODULE_AUTHOR("Julian Squires <julian@cipht.net>, Hans de Goede <hdegoede@redhat.com>");
 113 MODULE_DESCRIPTION("Wacom protocol 4 serial tablet driver");
 114 MODULE_LICENSE("GPL");
 115 
 116 #define REQUEST_MODEL_AND_ROM_VERSION   "~#"
 117 #define REQUEST_MAX_COORDINATES         "~C\r"
 118 #define REQUEST_CONFIGURATION_STRING    "~R\r"
 119 #define REQUEST_RESET_TO_PROTOCOL_IV    "\r#"
 120 /*
 121  * Note: sending "\r$\r" causes at least the Digitizer II to send
 122  * packets in ASCII instead of binary.  "\r#" seems to undo that.
 123  */
 124 
 125 #define COMMAND_START_SENDING_PACKETS           "ST\r"
 126 #define COMMAND_STOP_SENDING_PACKETS            "SP\r"
 127 #define COMMAND_MULTI_MODE_INPUT                "MU1\r"
 128 #define COMMAND_ORIGIN_IN_UPPER_LEFT            "OC1\r"
 129 #define COMMAND_ENABLE_ALL_MACRO_BUTTONS        "~M0\r"
 130 #define COMMAND_DISABLE_GROUP_1_MACRO_BUTTONS   "~M1\r"
 131 #define COMMAND_TRANSMIT_AT_MAX_RATE            "IT0\r"
 132 #define COMMAND_DISABLE_INCREMENTAL_MODE        "IN0\r"
 133 #define COMMAND_ENABLE_CONTINUOUS_MODE          "SR\r"
 134 #define COMMAND_ENABLE_PRESSURE_MODE            "PH1\r"
 135 #define COMMAND_Z_FILTER                        "ZF1\r"
 136 
 137 /* Note that this is a protocol 4 packet without tilt information. */
 138 #define PACKET_LENGTH           7
 139 #define DATA_SIZE               32
 140 
 141 /* flags */
 142 #define F_COVERS_SCREEN         0x01
 143 #define F_HAS_STYLUS2           0x02
 144 #define F_HAS_SCROLLWHEEL       0x04
 145 
 146 /* device IDs */
 147 #define STYLUS_DEVICE_ID        0x02
 148 #define CURSOR_DEVICE_ID        0x06
 149 #define ERASER_DEVICE_ID        0x0A
 150 
 151 enum { STYLUS = 1, ERASER, CURSOR };
 152 
 153 static const struct {
 154         int device_id;
 155         int input_id;
 156 } tools[] = {
 157         { 0, 0 },
 158         { STYLUS_DEVICE_ID, BTN_TOOL_PEN },
 159         { ERASER_DEVICE_ID, BTN_TOOL_RUBBER },
 160         { CURSOR_DEVICE_ID, BTN_TOOL_MOUSE },
 161 };
 162 
 163 struct wacom {
 164         struct input_dev *dev;
 165         struct completion cmd_done;
 166         int result;
 167         u8 expect;
 168         u8 eraser_mask;
 169         unsigned int extra_z_bits;
 170         unsigned int flags;
 171         unsigned int res_x, res_y;
 172         unsigned int max_x, max_y;
 173         unsigned int tool;
 174         unsigned int idx;
 175         u8 data[DATA_SIZE];
 176         char phys[32];
 177 };
 178 
 179 enum {
 180         MODEL_CINTIQ            = 0x504C, /* PL */
 181         MODEL_CINTIQ2           = 0x4454, /* DT */
 182         MODEL_DIGITIZER_II      = 0x5544, /* UD */
 183         MODEL_GRAPHIRE          = 0x4554, /* ET */
 184         MODEL_PENPARTNER        = 0x4354, /* CT */
 185         MODEL_ARTPAD_II         = 0x4B54, /* KT */
 186 };
 187 
 188 static void wacom_handle_model_response(struct wacom *wacom)
 189 {
 190         int major_v, minor_v, r = 0;
 191         char *p;
 192 
 193         p = strrchr(wacom->data, 'V');
 194         if (p)
 195                 r = sscanf(p + 1, "%u.%u", &major_v, &minor_v);
 196         if (r != 2)
 197                 major_v = minor_v = 0;
 198 
 199         switch (wacom->data[2] << 8 | wacom->data[3]) {
 200         case MODEL_CINTIQ:      /* UNTESTED */
 201         case MODEL_CINTIQ2:
 202                 if ((wacom->data[2] << 8 | wacom->data[3]) == MODEL_CINTIQ) {
 203                         wacom->dev->name = "Wacom Cintiq";
 204                         wacom->dev->id.version = MODEL_CINTIQ;
 205                 } else {
 206                         wacom->dev->name = "Wacom Cintiq II";
 207                         wacom->dev->id.version = MODEL_CINTIQ2;
 208                 }
 209                 wacom->res_x = 508;
 210                 wacom->res_y = 508;
 211 
 212                 switch (wacom->data[5] << 8 | wacom->data[6]) {
 213                 case 0x3731: /* PL-710 */
 214                         wacom->res_x = 2540;
 215                         wacom->res_y = 2540;
 216                         /* fall through */
 217                 case 0x3535: /* PL-550 */
 218                 case 0x3830: /* PL-800 */
 219                         wacom->extra_z_bits = 2;
 220                 }
 221 
 222                 wacom->flags = F_COVERS_SCREEN;
 223                 break;
 224 
 225         case MODEL_PENPARTNER:
 226                 wacom->dev->name = "Wacom Penpartner";
 227                 wacom->dev->id.version = MODEL_PENPARTNER;
 228                 wacom->res_x = 1000;
 229                 wacom->res_y = 1000;
 230                 break;
 231 
 232         case MODEL_GRAPHIRE:
 233                 wacom->dev->name = "Wacom Graphire";
 234                 wacom->dev->id.version = MODEL_GRAPHIRE;
 235                 wacom->res_x = 1016;
 236                 wacom->res_y = 1016;
 237                 wacom->max_x = 5103;
 238                 wacom->max_y = 3711;
 239                 wacom->extra_z_bits = 2;
 240                 wacom->eraser_mask = 0x08;
 241                 wacom->flags = F_HAS_STYLUS2 | F_HAS_SCROLLWHEEL;
 242                 break;
 243 
 244         case MODEL_ARTPAD_II:
 245         case MODEL_DIGITIZER_II:
 246                 wacom->dev->name = "Wacom Digitizer II";
 247                 wacom->dev->id.version = MODEL_DIGITIZER_II;
 248                 if (major_v == 1 && minor_v <= 2)
 249                         wacom->extra_z_bits = 0; /* UNTESTED */
 250                 break;
 251 
 252         default:
 253                 dev_err(&wacom->dev->dev, "Unsupported Wacom model %s\n",
 254                         wacom->data);
 255                 wacom->result = -ENODEV;
 256                 return;
 257         }
 258 
 259         dev_info(&wacom->dev->dev, "%s tablet, version %u.%u\n",
 260                  wacom->dev->name, major_v, minor_v);
 261 }
 262 
 263 static void wacom_handle_configuration_response(struct wacom *wacom)
 264 {
 265         int r, skip;
 266 
 267         dev_dbg(&wacom->dev->dev, "Configuration string: %s\n", wacom->data);
 268         r = sscanf(wacom->data, "~R%x,%u,%u,%u,%u", &skip, &skip, &skip,
 269                    &wacom->res_x, &wacom->res_y);
 270         if (r != 5)
 271                 dev_warn(&wacom->dev->dev, "could not get resolution\n");
 272 }
 273 
 274 static void wacom_handle_coordinates_response(struct wacom *wacom)
 275 {
 276         int r;
 277 
 278         dev_dbg(&wacom->dev->dev, "Coordinates string: %s\n", wacom->data);
 279         r = sscanf(wacom->data, "~C%u,%u", &wacom->max_x, &wacom->max_y);
 280         if (r != 2)
 281                 dev_warn(&wacom->dev->dev, "could not get max coordinates\n");
 282 }
 283 
 284 static void wacom_handle_response(struct wacom *wacom)
 285 {
 286         if (wacom->data[0] != '~' || wacom->data[1] != wacom->expect) {
 287                 dev_err(&wacom->dev->dev,
 288                         "Wacom got an unexpected response: %s\n", wacom->data);
 289                 wacom->result = -EIO;
 290         } else {
 291                 wacom->result = 0;
 292 
 293                 switch (wacom->data[1]) {
 294                 case '#':
 295                         wacom_handle_model_response(wacom);
 296                         break;
 297                 case 'R':
 298                         wacom_handle_configuration_response(wacom);
 299                         break;
 300                 case 'C':
 301                         wacom_handle_coordinates_response(wacom);
 302                         break;
 303                 }
 304         }
 305 
 306         complete(&wacom->cmd_done);
 307 }
 308 
 309 static void wacom_handle_packet(struct wacom *wacom)
 310 {
 311         u8 in_proximity_p, stylus_p, button;
 312         unsigned int tool;
 313         int x, y, z;
 314 
 315         in_proximity_p = wacom->data[0] & 0x40;
 316         stylus_p = wacom->data[0] & 0x20;
 317         button = (wacom->data[3] & 0x78) >> 3;
 318         x = (wacom->data[0] & 3) << 14 | wacom->data[1]<<7 | wacom->data[2];
 319         y = (wacom->data[3] & 3) << 14 | wacom->data[4]<<7 | wacom->data[5];
 320 
 321         if (in_proximity_p && stylus_p) {
 322                 z = wacom->data[6] & 0x7f;
 323                 if (wacom->extra_z_bits >= 1)
 324                         z = z << 1 | (wacom->data[3] & 0x4) >> 2;
 325                 if (wacom->extra_z_bits > 1)
 326                         z = z << 1 | (wacom->data[0] & 0x4) >> 2;
 327                 z = z ^ (0x40 << wacom->extra_z_bits);
 328         } else {
 329                 z = -1;
 330         }
 331 
 332         if (stylus_p)
 333                 tool = (button & wacom->eraser_mask) ? ERASER : STYLUS;
 334         else
 335                 tool = CURSOR;
 336 
 337         if (tool != wacom->tool && wacom->tool != 0) {
 338                 input_report_key(wacom->dev, tools[wacom->tool].input_id, 0);
 339                 input_sync(wacom->dev);
 340         }
 341         wacom->tool = tool;
 342 
 343         input_report_key(wacom->dev, tools[tool].input_id, in_proximity_p);
 344         input_report_abs(wacom->dev, ABS_MISC,
 345                          in_proximity_p ? tools[tool].device_id : 0);
 346         input_report_abs(wacom->dev, ABS_X, x);
 347         input_report_abs(wacom->dev, ABS_Y, y);
 348         input_report_abs(wacom->dev, ABS_PRESSURE, z);
 349         if (stylus_p) {
 350                 input_report_key(wacom->dev, BTN_TOUCH, button & 1);
 351                 input_report_key(wacom->dev, BTN_STYLUS, button & 2);
 352                 input_report_key(wacom->dev, BTN_STYLUS2, button & 4);
 353         } else {
 354                 input_report_key(wacom->dev, BTN_LEFT, button & 1);
 355                 input_report_key(wacom->dev, BTN_RIGHT, button & 2);
 356                 input_report_key(wacom->dev, BTN_MIDDLE, button & 4);
 357                 /* handle relative wheel for non-stylus device */
 358                 z = (wacom->data[6] & 0x30) >> 4;
 359                 if (wacom->data[6] & 0x40)
 360                         z = -z;
 361                 input_report_rel(wacom->dev, REL_WHEEL, z);
 362         }
 363         input_sync(wacom->dev);
 364 }
 365 
 366 static void wacom_clear_data_buf(struct wacom *wacom)
 367 {
 368         memset(wacom->data, 0, DATA_SIZE);
 369         wacom->idx = 0;
 370 }
 371 
 372 static irqreturn_t wacom_interrupt(struct serio *serio, unsigned char data,
 373                                    unsigned int flags)
 374 {
 375         struct wacom *wacom = serio_get_drvdata(serio);
 376 
 377         if (data & 0x80)
 378                 wacom->idx = 0;
 379 
 380         /*
 381          * We're either expecting a carriage return-terminated ASCII
 382          * response string, or a seven-byte packet with the MSB set on
 383          * the first byte.
 384          *
 385          * Note however that some tablets (the PenPartner, for
 386          * example) don't send a carriage return at the end of a
 387          * command.  We handle these by waiting for timeout.
 388          */
 389         if (data == '\r' && !(wacom->data[0] & 0x80)) {
 390                 wacom_handle_response(wacom);
 391                 wacom_clear_data_buf(wacom);
 392                 return IRQ_HANDLED;
 393         }
 394 
 395         /* Leave place for 0 termination */
 396         if (wacom->idx > (DATA_SIZE - 2)) {
 397                 dev_dbg(&wacom->dev->dev,
 398                         "throwing away %d bytes of garbage\n", wacom->idx);
 399                 wacom_clear_data_buf(wacom);
 400         }
 401         wacom->data[wacom->idx++] = data;
 402 
 403         if (wacom->idx == PACKET_LENGTH && (wacom->data[0] & 0x80)) {
 404                 wacom_handle_packet(wacom);
 405                 wacom_clear_data_buf(wacom);
 406         }
 407 
 408         return IRQ_HANDLED;
 409 }
 410 
 411 static void wacom_disconnect(struct serio *serio)
 412 {
 413         struct wacom *wacom = serio_get_drvdata(serio);
 414 
 415         serio_close(serio);
 416         serio_set_drvdata(serio, NULL);
 417         input_unregister_device(wacom->dev);
 418         kfree(wacom);
 419 }
 420 
 421 static int wacom_send(struct serio *serio, const u8 *command)
 422 {
 423         int err = 0;
 424 
 425         for (; !err && *command; command++)
 426                 err = serio_write(serio, *command);
 427 
 428         return err;
 429 }
 430 
 431 static int wacom_send_setup_string(struct wacom *wacom, struct serio *serio)
 432 {
 433         const u8 *cmd;
 434 
 435         switch (wacom->dev->id.version) {
 436         case MODEL_CINTIQ:      /* UNTESTED */
 437                 cmd = COMMAND_ORIGIN_IN_UPPER_LEFT
 438                         COMMAND_TRANSMIT_AT_MAX_RATE
 439                         COMMAND_ENABLE_CONTINUOUS_MODE
 440                         COMMAND_START_SENDING_PACKETS;
 441                 break;
 442 
 443         case MODEL_PENPARTNER:
 444                 cmd = COMMAND_ENABLE_PRESSURE_MODE
 445                         COMMAND_START_SENDING_PACKETS;
 446                 break;
 447 
 448         default:
 449                 cmd = COMMAND_MULTI_MODE_INPUT
 450                         COMMAND_ORIGIN_IN_UPPER_LEFT
 451                         COMMAND_ENABLE_ALL_MACRO_BUTTONS
 452                         COMMAND_DISABLE_GROUP_1_MACRO_BUTTONS
 453                         COMMAND_TRANSMIT_AT_MAX_RATE
 454                         COMMAND_DISABLE_INCREMENTAL_MODE
 455                         COMMAND_ENABLE_CONTINUOUS_MODE
 456                         COMMAND_Z_FILTER
 457                         COMMAND_START_SENDING_PACKETS;
 458                 break;
 459         }
 460 
 461         return wacom_send(serio, cmd);
 462 }
 463 
 464 static int wacom_send_and_wait(struct wacom *wacom, struct serio *serio,
 465                                const u8 *cmd, const char *desc)
 466 {
 467         int err;
 468         unsigned long u;
 469 
 470         wacom->expect = cmd[1];
 471         init_completion(&wacom->cmd_done);
 472 
 473         err = wacom_send(serio, cmd);
 474         if (err)
 475                 return err;
 476 
 477         u = wait_for_completion_timeout(&wacom->cmd_done, HZ);
 478         if (u == 0) {
 479                 /* Timeout, process what we've received. */
 480                 wacom_handle_response(wacom);
 481         }
 482 
 483         wacom->expect = 0;
 484         return wacom->result;
 485 }
 486 
 487 static int wacom_setup(struct wacom *wacom, struct serio *serio)
 488 {
 489         int err;
 490 
 491         /* Note that setting the link speed is the job of inputattach.
 492          * We assume that reset negotiation has already happened,
 493          * here. */
 494         err = wacom_send_and_wait(wacom, serio, REQUEST_MODEL_AND_ROM_VERSION,
 495                                   "model and version");
 496         if (err)
 497                 return err;
 498 
 499         if (!(wacom->res_x && wacom->res_y)) {
 500                 err = wacom_send_and_wait(wacom, serio,
 501                                           REQUEST_CONFIGURATION_STRING,
 502                                           "configuration string");
 503                 if (err)
 504                         return err;
 505         }
 506 
 507         if (!(wacom->max_x && wacom->max_y)) {
 508                 err = wacom_send_and_wait(wacom, serio,
 509                                           REQUEST_MAX_COORDINATES,
 510                                           "coordinates string");
 511                 if (err)
 512                         return err;
 513         }
 514 
 515         return wacom_send_setup_string(wacom, serio);
 516 }
 517 
 518 static int wacom_connect(struct serio *serio, struct serio_driver *drv)
 519 {
 520         struct wacom *wacom;
 521         struct input_dev *input_dev;
 522         int err = -ENOMEM;
 523 
 524         wacom = kzalloc(sizeof(struct wacom), GFP_KERNEL);
 525         input_dev = input_allocate_device();
 526         if (!wacom || !input_dev)
 527                 goto free_device;
 528 
 529         wacom->dev = input_dev;
 530         wacom->extra_z_bits = 1;
 531         wacom->eraser_mask = 0x04;
 532         wacom->tool = wacom->idx = 0;
 533         snprintf(wacom->phys, sizeof(wacom->phys), "%s/input0", serio->phys);
 534         input_dev->phys = wacom->phys;
 535         input_dev->id.bustype = BUS_RS232;
 536         input_dev->id.vendor  = SERIO_WACOM_IV;
 537         input_dev->id.product = serio->id.extra;
 538         input_dev->dev.parent = &serio->dev;
 539 
 540         input_dev->evbit[0] =
 541                 BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS) | BIT_MASK(EV_REL);
 542         set_bit(ABS_MISC, input_dev->absbit);
 543         set_bit(BTN_TOOL_PEN, input_dev->keybit);
 544         set_bit(BTN_TOOL_RUBBER, input_dev->keybit);
 545         set_bit(BTN_TOOL_MOUSE, input_dev->keybit);
 546         set_bit(BTN_TOUCH, input_dev->keybit);
 547         set_bit(BTN_STYLUS, input_dev->keybit);
 548         set_bit(BTN_LEFT, input_dev->keybit);
 549         set_bit(BTN_RIGHT, input_dev->keybit);
 550         set_bit(BTN_MIDDLE, input_dev->keybit);
 551 
 552         serio_set_drvdata(serio, wacom);
 553 
 554         err = serio_open(serio, drv);
 555         if (err)
 556                 goto free_device;
 557 
 558         err = wacom_setup(wacom, serio);
 559         if (err)
 560                 goto close_serio;
 561 
 562         set_bit(INPUT_PROP_DIRECT, input_dev->propbit);
 563         if (!(wacom->flags & F_COVERS_SCREEN))
 564                 __set_bit(INPUT_PROP_POINTER, input_dev->propbit);
 565 
 566         if (wacom->flags & F_HAS_STYLUS2)
 567                 __set_bit(BTN_STYLUS2, input_dev->keybit);
 568 
 569         if (wacom->flags & F_HAS_SCROLLWHEEL)
 570                 __set_bit(REL_WHEEL, input_dev->relbit);
 571 
 572         input_abs_set_res(wacom->dev, ABS_X, wacom->res_x);
 573         input_abs_set_res(wacom->dev, ABS_Y, wacom->res_y);
 574         input_set_abs_params(wacom->dev, ABS_X, 0, wacom->max_x, 0, 0);
 575         input_set_abs_params(wacom->dev, ABS_Y, 0, wacom->max_y, 0, 0);
 576         input_set_abs_params(wacom->dev, ABS_PRESSURE, -1,
 577                              (1 << (7 + wacom->extra_z_bits)) - 1, 0, 0);
 578 
 579         err = input_register_device(wacom->dev);
 580         if (err)
 581                 goto close_serio;
 582 
 583         return 0;
 584 
 585 close_serio:
 586         serio_close(serio);
 587 free_device:
 588         serio_set_drvdata(serio, NULL);
 589         input_free_device(input_dev);
 590         kfree(wacom);
 591         return err;
 592 }
 593 
 594 static const struct serio_device_id wacom_serio_ids[] = {
 595         {
 596                 .type   = SERIO_RS232,
 597                 .proto  = SERIO_WACOM_IV,
 598                 .id     = SERIO_ANY,
 599                 .extra  = SERIO_ANY,
 600         },
 601         { 0 }
 602 };
 603 
 604 MODULE_DEVICE_TABLE(serio, wacom_serio_ids);
 605 
 606 static struct serio_driver wacom_drv = {
 607         .driver         = {
 608                 .name   = "wacom_serial4",
 609         },
 610         .description    = "Wacom protocol 4 serial tablet driver",
 611         .id_table       = wacom_serio_ids,
 612         .interrupt      = wacom_interrupt,
 613         .connect        = wacom_connect,
 614         .disconnect     = wacom_disconnect,
 615 };
 616 
 617 module_serio_driver(wacom_drv);
/* [<][>][^][v][top][bottom][index][help] */
root/drivers/input/tablet/wacom_serial4.c

DEFINITIONS
