drivers/input/touchscreen/zforce_ts.c

   1 /*
   2  * Copyright (C) 2012-2013 MundoReader S.L.
   3  * Author: Heiko Stuebner <heiko@sntech.de>
   4  *
   5  * based in parts on Nook zforce driver
   6  *
   7  * Copyright (C) 2010 Barnes & Noble, Inc.
   8  * Author: Pieter Truter<ptruter@intrinsyc.com>
   9  *
  10  * This software is licensed under the terms of the GNU General Public
  11  * License version 2, as published by the Free Software Foundation, and
  12  * may be copied, distributed, and modified under those terms.
  13  *
  14  * This program is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17  * GNU General Public License for more details.
  18  */
  19
  20 #include <linux/module.h>
  21 #include <linux/hrtimer.h>
  22 #include <linux/slab.h>
  23 #include <linux/input.h>
  24 #include <linux/interrupt.h>
  25 #include <linux/i2c.h>
  26 #include <linux/delay.h>
  27 #include <linux/gpio.h>
  28 #include <linux/device.h>
  29 #include <linux/sysfs.h>
  30 #include <linux/input/mt.h>
  31 #include <linux/platform_data/zforce_ts.h>
  32
  33 #define WAIT_TIMEOUT            msecs_to_jiffies(1000)
  34
  35 #define FRAME_START             0xee
  36
  37 /* Offsets of the different parts of the payload the controller sends */
  38 #define PAYLOAD_HEADER          0
  39 #define PAYLOAD_LENGTH          1
  40 #define PAYLOAD_BODY            2
  41
  42 /* Response offsets */
  43 #define RESPONSE_ID             0
  44 #define RESPONSE_DATA           1
  45
  46 /* Commands */
  47 #define COMMAND_DEACTIVATE      0x00
  48 #define COMMAND_INITIALIZE      0x01
  49 #define COMMAND_RESOLUTION      0x02
  50 #define COMMAND_SETCONFIG       0x03
  51 #define COMMAND_DATAREQUEST     0x04
  52 #define COMMAND_SCANFREQ        0x08
  53 #define COMMAND_STATUS          0X1e
  54
  55 /*
  56  * Responses the controller sends as a result of
  57  * command requests
  58  */
  59 #define RESPONSE_DEACTIVATE     0x00
  60 #define RESPONSE_INITIALIZE     0x01
  61 #define RESPONSE_RESOLUTION     0x02
  62 #define RESPONSE_SETCONFIG      0x03
  63 #define RESPONSE_SCANFREQ       0x08
  64 #define RESPONSE_STATUS         0X1e
  65
  66 /*
  67  * Notifications are send by the touch controller without
  68  * being requested by the driver and include for example
  69  * touch indications
  70  */
  71 #define NOTIFICATION_TOUCH              0x04
  72 #define NOTIFICATION_BOOTCOMPLETE       0x07
  73 #define NOTIFICATION_OVERRUN            0x25
  74 #define NOTIFICATION_PROXIMITY          0x26
  75 #define NOTIFICATION_INVALID_COMMAND    0xfe
  76
  77 #define ZFORCE_REPORT_POINTS            2
  78 #define ZFORCE_MAX_AREA                 0xff
  79
  80 #define STATE_DOWN                      0
  81 #define STATE_MOVE                      1
  82 #define STATE_UP                        2
  83
  84 #define SETCONFIG_DUALTOUCH             (1 << 0)
  85
  86 struct zforce_point {
  87         int coord_x;
  88         int coord_y;
  89         int state;
  90         int id;
  91         int area_major;
  92         int area_minor;
  93         int orientation;
  94         int pressure;
  95         int prblty;
  96 };
  97
  98 /*
  99  * @client              the i2c_client
 100  * @input               the input device
 101  * @suspending          in the process of going to suspend (don't emit wakeup
 102  *                      events for commands executed to suspend the device)
 103  * @suspended           device suspended
 104  * @access_mutex        serialize i2c-access, to keep multipart reads together
 105  * @command_done        completion to wait for the command result
 106  * @command_mutex       serialize commands send to the ic
 107  * @command_waiting     the id of the command that that is currently waiting
 108  *                      for a result
 109  * @command_result      returned result of the command
 110  */
 111 struct zforce_ts {
 112         struct i2c_client       *client;
 113         struct input_dev        *input;
 114         const struct zforce_ts_platdata *pdata;
 115         char                    phys[32];
 116
 117         bool                    suspending;
 118         bool                    suspended;
 119         bool                    boot_complete;
 120
 121         /* Firmware version information */
 122         u16                     version_major;
 123         u16                     version_minor;
 124         u16                     version_build;
 125         u16                     version_rev;
 126
 127         struct mutex            access_mutex;
 128
 129         struct completion       command_done;
 130         struct mutex            command_mutex;
 131         int                     command_waiting;
 132         int                     command_result;
 133 };
 134
 135 static int zforce_command(struct zforce_ts *ts, u8 cmd)
 136 {
 137         struct i2c_client *client = ts->client;
 138         char buf[3];
 139         int ret;
 140
 141         dev_dbg(&client->dev, "%s: 0x%x\n", __func__, cmd);
 142
 143         buf[0] = FRAME_START;
 144         buf[1] = 1; /* data size, command only */
 145         buf[2] = cmd;
 146
 147         mutex_lock(&ts->access_mutex);
 148         ret = i2c_master_send(client, &buf[0], ARRAY_SIZE(buf));
 149         mutex_unlock(&ts->access_mutex);
 150         if (ret < 0) {
 151                 dev_err(&client->dev, "i2c send data request error: %d\n", ret);
 152                 return ret;
 153         }
 154
 155         return 0;
 156 }
 157
 158 static int zforce_send_wait(struct zforce_ts *ts, const char *buf, int len)
 159 {
 160         struct i2c_client *client = ts->client;
 161         int ret;
 162
 163         ret = mutex_trylock(&ts->command_mutex);
 164         if (!ret) {
 165                 dev_err(&client->dev, "already waiting for a command\n");
 166                 return -EBUSY;
 167         }
 168
 169         dev_dbg(&client->dev, "sending %d bytes for command 0x%x\n",
 170                 buf[1], buf[2]);
 171
 172         ts->command_waiting = buf[2];
 173
 174         mutex_lock(&ts->access_mutex);
 175         ret = i2c_master_send(client, buf, len);
 176         mutex_unlock(&ts->access_mutex);
 177         if (ret < 0) {
 178                 dev_err(&client->dev, "i2c send data request error: %d\n", ret);
 179                 goto unlock;
 180         }
 181
 182         dev_dbg(&client->dev, "waiting for result for command 0x%x\n", buf[2]);
 183
 184         if (wait_for_completion_timeout(&ts->command_done, WAIT_TIMEOUT) == 0) {
 185                 ret = -ETIME;
 186                 goto unlock;
 187         }
 188
 189         ret = ts->command_result;
 190
 191 unlock:
 192         mutex_unlock(&ts->command_mutex);
 193         return ret;
 194 }
 195
 196 static int zforce_command_wait(struct zforce_ts *ts, u8 cmd)
 197 {
 198         struct i2c_client *client = ts->client;
 199         char buf[3];
 200         int ret;
 201
 202         dev_dbg(&client->dev, "%s: 0x%x\n", __func__, cmd);
 203
 204         buf[0] = FRAME_START;
 205         buf[1] = 1; /* data size, command only */
 206         buf[2] = cmd;
 207
 208         ret = zforce_send_wait(ts, &buf[0], ARRAY_SIZE(buf));
 209         if (ret < 0) {
 210                 dev_err(&client->dev, "i2c send data request error: %d\n", ret);
 211                 return ret;
 212         }
 213
 214         return 0;
 215 }
 216
 217 static int zforce_resolution(struct zforce_ts *ts, u16 x, u16 y)
 218 {
 219         struct i2c_client *client = ts->client;
 220         char buf[7] = { FRAME_START, 5, COMMAND_RESOLUTION,
 221                         (x & 0xff), ((x >> 8) & 0xff),
 222                         (y & 0xff), ((y >> 8) & 0xff) };
 223
 224         dev_dbg(&client->dev, "set resolution to (%d,%d)\n", x, y);
 225
 226         return zforce_send_wait(ts, &buf[0], ARRAY_SIZE(buf));
 227 }
 228
 229 static int zforce_scan_frequency(struct zforce_ts *ts, u16 idle, u16 finger,
 230                                  u16 stylus)
 231 {
 232         struct i2c_client *client = ts->client;
 233         char buf[9] = { FRAME_START, 7, COMMAND_SCANFREQ,
 234                         (idle & 0xff), ((idle >> 8) & 0xff),
 235                         (finger & 0xff), ((finger >> 8) & 0xff),
 236                         (stylus & 0xff), ((stylus >> 8) & 0xff) };
 237
 238         dev_dbg(&client->dev, "set scan frequency to (idle: %d, finger: %d, stylus: %d)\n",
 239                 idle, finger, stylus);
 240
 241         return zforce_send_wait(ts, &buf[0], ARRAY_SIZE(buf));
 242 }
 243
 244 static int zforce_setconfig(struct zforce_ts *ts, char b1)
 245 {
 246         struct i2c_client *client = ts->client;
 247         char buf[7] = { FRAME_START, 5, COMMAND_SETCONFIG,
 248                         b1, 0, 0, 0 };
 249
 250         dev_dbg(&client->dev, "set config to (%d)\n", b1);
 251
 252         return zforce_send_wait(ts, &buf[0], ARRAY_SIZE(buf));
 253 }
 254
 255 static int zforce_start(struct zforce_ts *ts)
 256 {
 257         struct i2c_client *client = ts->client;
 258         const struct zforce_ts_platdata *pdata = dev_get_platdata(&client->dev);
 259         int ret;
 260
 261         dev_dbg(&client->dev, "starting device\n");
 262
 263         ret = zforce_command_wait(ts, COMMAND_INITIALIZE);
 264         if (ret) {
 265                 dev_err(&client->dev, "Unable to initialize, %d\n", ret);
 266                 return ret;
 267         }
 268
 269         ret = zforce_resolution(ts, pdata->x_max, pdata->y_max);
 270         if (ret) {
 271                 dev_err(&client->dev, "Unable to set resolution, %d\n", ret);
 272                 goto error;
 273         }
 274
 275         ret = zforce_scan_frequency(ts, 10, 50, 50);
 276         if (ret) {
 277                 dev_err(&client->dev, "Unable to set scan frequency, %d\n",
 278                         ret);
 279                 goto error;
 280         }
 281
 282         if (zforce_setconfig(ts, SETCONFIG_DUALTOUCH)) {
 283                 dev_err(&client->dev, "Unable to set config\n");
 284                 goto error;
 285         }
 286
 287         /* start sending touch events */
 288         ret = zforce_command(ts, COMMAND_DATAREQUEST);
 289         if (ret) {
 290                 dev_err(&client->dev, "Unable to request data\n");
 291                 goto error;
 292         }
 293
 294         /*
 295          * Per NN, initial cal. take max. of 200msec.
 296          * Allow time to complete this calibration
 297          */
 298         msleep(200);
 299
 300         return 0;
 301
 302 error:
 303         zforce_command_wait(ts, COMMAND_DEACTIVATE);
 304         return ret;
 305 }
 306
 307 static int zforce_stop(struct zforce_ts *ts)
 308 {
 309         struct i2c_client *client = ts->client;
 310         int ret;
 311
 312         dev_dbg(&client->dev, "stopping device\n");
 313
 314         /* Deactivates touch sensing and puts the device into sleep. */
 315         ret = zforce_command_wait(ts, COMMAND_DEACTIVATE);
 316         if (ret != 0) {
 317                 dev_err(&client->dev, "could not deactivate device, %d\n",
 318                         ret);
 319                 return ret;
 320         }
 321
 322         return 0;
 323 }
 324
 325 static int zforce_touch_event(struct zforce_ts *ts, u8 *payload)
 326 {
 327         struct i2c_client *client = ts->client;
 328         const struct zforce_ts_platdata *pdata = dev_get_platdata(&client->dev);
 329         struct zforce_point point;
 330         int count, i, num = 0;
 331
 332         count = payload[0];
 333         if (count > ZFORCE_REPORT_POINTS) {
 334                 dev_warn(&client->dev, "to many coordinates %d, expected max %d\n",
 335                          count, ZFORCE_REPORT_POINTS);
 336                 count = ZFORCE_REPORT_POINTS;
 337         }
 338
 339         for (i = 0; i < count; i++) {
 340                 point.coord_x =
 341                         payload[9 * i + 2] << 8 | payload[9 * i + 1];
 342                 point.coord_y =
 343                         payload[9 * i + 4] << 8 | payload[9 * i + 3];
 344
 345                 if (point.coord_x > pdata->x_max ||
 346                     point.coord_y > pdata->y_max) {
 347                         dev_warn(&client->dev, "coordinates (%d,%d) invalid\n",
 348                                 point.coord_x, point.coord_y);
 349                         point.coord_x = point.coord_y = 0;
 350                 }
 351
 352                 point.state = payload[9 * i + 5] & 0x03;
 353                 point.id = (payload[9 * i + 5] & 0xfc) >> 2;
 354
 355                 /* determine touch major, minor and orientation */
 356                 point.area_major = max(payload[9 * i + 6],
 357                                           payload[9 * i + 7]);
 358                 point.area_minor = min(payload[9 * i + 6],
 359                                           payload[9 * i + 7]);
 360                 point.orientation = payload[9 * i + 6] > payload[9 * i + 7];
 361
 362                 point.pressure = payload[9 * i + 8];
 363                 point.prblty = payload[9 * i + 9];
 364
 365                 dev_dbg(&client->dev,
 366                         "point %d/%d: state %d, id %d, pressure %d, prblty %d, x %d, y %d, amajor %d, aminor %d, ori %d\n",
 367                         i, count, point.state, point.id,
 368                         point.pressure, point.prblty,
 369                         point.coord_x, point.coord_y,
 370                         point.area_major, point.area_minor,
 371                         point.orientation);
 372
 373                 /* the zforce id starts with "1", so needs to be decreased */
 374                 input_mt_slot(ts->input, point.id - 1);
 375
 376                 input_mt_report_slot_state(ts->input, MT_TOOL_FINGER,
 377                                                 point.state != STATE_UP);
 378
 379                 if (point.state != STATE_UP) {
 380                         input_report_abs(ts->input, ABS_MT_POSITION_X,
 381                                          point.coord_x);
 382                         input_report_abs(ts->input, ABS_MT_POSITION_Y,
 383                                          point.coord_y);
 384                         input_report_abs(ts->input, ABS_MT_TOUCH_MAJOR,
 385                                          point.area_major);
 386                         input_report_abs(ts->input, ABS_MT_TOUCH_MINOR,
 387                                          point.area_minor);
 388                         input_report_abs(ts->input, ABS_MT_ORIENTATION,
 389                                          point.orientation);
 390                         num++;
 391                 }
 392         }
 393
 394         input_mt_sync_frame(ts->input);
 395
 396         input_mt_report_finger_count(ts->input, num);
 397
 398         input_sync(ts->input);
 399
 400         return 0;
 401 }
 402
 403 static int zforce_read_packet(struct zforce_ts *ts, u8 *buf)
 404 {
 405         struct i2c_client *client = ts->client;
 406         int ret;
 407
 408         mutex_lock(&ts->access_mutex);
 409
 410         /* read 2 byte message header */
 411         ret = i2c_master_recv(client, buf, 2);
 412         if (ret < 0) {
 413                 dev_err(&client->dev, "error reading header: %d\n", ret);
 414                 goto unlock;
 415         }
 416
 417         if (buf[PAYLOAD_HEADER] != FRAME_START) {
 418                 dev_err(&client->dev, "invalid frame start: %d\n", buf[0]);
 419                 ret = -EIO;
 420                 goto unlock;
 421         }
 422
 423         if (buf[PAYLOAD_LENGTH] <= 0 || buf[PAYLOAD_LENGTH] > 255) {
 424                 dev_err(&client->dev, "invalid payload length: %d\n",
 425                         buf[PAYLOAD_LENGTH]);
 426                 ret = -EIO;
 427                 goto unlock;
 428         }
 429
 430         /* read the message */
 431         ret = i2c_master_recv(client, &buf[PAYLOAD_BODY], buf[PAYLOAD_LENGTH]);
 432         if (ret < 0) {
 433                 dev_err(&client->dev, "error reading payload: %d\n", ret);
 434                 goto unlock;
 435         }
 436
 437         dev_dbg(&client->dev, "read %d bytes for response command 0x%x\n",
 438                 buf[PAYLOAD_LENGTH], buf[PAYLOAD_BODY]);
 439
 440 unlock:
 441         mutex_unlock(&ts->access_mutex);
 442         return ret;
 443 }
 444
 445 static void zforce_complete(struct zforce_ts *ts, int cmd, int result)
 446 {
 447         struct i2c_client *client = ts->client;
 448
 449         if (ts->command_waiting == cmd) {
 450                 dev_dbg(&client->dev, "completing command 0x%x\n", cmd);
 451                 ts->command_result = result;
 452                 complete(&ts->command_done);
 453         } else {
 454                 dev_dbg(&client->dev, "command %d not for us\n", cmd);
 455         }
 456 }
 457
 458 static irqreturn_t zforce_interrupt(int irq, void *dev_id)
 459 {
 460         struct zforce_ts *ts = dev_id;
 461         struct i2c_client *client = ts->client;
 462         const struct zforce_ts_platdata *pdata = dev_get_platdata(&client->dev);
 463         int ret;
 464         u8 payload_buffer[512];
 465         u8 *payload;
 466
 467         /*
 468          * When suspended, emit a wakeup signal if necessary and return.
 469          * Due to the level-interrupt we will get re-triggered later.
 470          */
 471         if (ts->suspended) {
 472                 if (device_may_wakeup(&client->dev))
 473                         pm_wakeup_event(&client->dev, 500);
 474                 msleep(20);
 475                 return IRQ_HANDLED;
 476         }
 477
 478         dev_dbg(&client->dev, "handling interrupt\n");
 479
 480         /* Don't emit wakeup events from commands run by zforce_suspend */
 481         if (!ts->suspending && device_may_wakeup(&client->dev))
 482                 pm_stay_awake(&client->dev);
 483
 484         while (!gpio_get_value(pdata->gpio_int)) {
 485                 ret = zforce_read_packet(ts, payload_buffer);
 486                 if (ret < 0) {
 487                         dev_err(&client->dev, "could not read packet, ret: %d\n",
 488                                 ret);
 489                         break;
 490                 }
 491
 492                 payload =  &payload_buffer[PAYLOAD_BODY];
 493
 494                 switch (payload[RESPONSE_ID]) {
 495                 case NOTIFICATION_TOUCH:
 496                         /*
 497                          * Always report touch-events received while
 498                          * suspending, when being a wakeup source
 499                          */
 500                         if (ts->suspending && device_may_wakeup(&client->dev))
 501                                 pm_wakeup_event(&client->dev, 500);
 502                         zforce_touch_event(ts, &payload[RESPONSE_DATA]);
 503                         break;
 504
 505                 case NOTIFICATION_BOOTCOMPLETE:
 506                         ts->boot_complete = payload[RESPONSE_DATA];
 507                         zforce_complete(ts, payload[RESPONSE_ID], 0);
 508                         break;
 509
 510                 case RESPONSE_INITIALIZE:
 511                 case RESPONSE_DEACTIVATE:
 512                 case RESPONSE_SETCONFIG:
 513                 case RESPONSE_RESOLUTION:
 514                 case RESPONSE_SCANFREQ:
 515                         zforce_complete(ts, payload[RESPONSE_ID],
 516                                         payload[RESPONSE_DATA]);
 517                         break;
 518
 519                 case RESPONSE_STATUS:
 520                         /*
 521                          * Version Payload Results
 522                          * [2:major] [2:minor] [2:build] [2:rev]
 523                          */
 524                         ts->version_major = (payload[RESPONSE_DATA + 1] << 8) |
 525                                                 payload[RESPONSE_DATA];
 526                         ts->version_minor = (payload[RESPONSE_DATA + 3] << 8) |
 527                                                 payload[RESPONSE_DATA + 2];
 528                         ts->version_build = (payload[RESPONSE_DATA + 5] << 8) |
 529                                                 payload[RESPONSE_DATA + 4];
 530                         ts->version_rev   = (payload[RESPONSE_DATA + 7] << 8) |
 531                                                 payload[RESPONSE_DATA + 6];
 532                         dev_dbg(&ts->client->dev, "Firmware Version %04x:%04x %04x:%04x\n",
 533                                 ts->version_major, ts->version_minor,
 534                                 ts->version_build, ts->version_rev);
 535
 536                         zforce_complete(ts, payload[RESPONSE_ID], 0);
 537                         break;
 538
 539                 case NOTIFICATION_INVALID_COMMAND:
 540                         dev_err(&ts->client->dev, "invalid command: 0x%x\n",
 541                                 payload[RESPONSE_DATA]);
 542                         break;
 543
 544                 default:
 545                         dev_err(&ts->client->dev, "unrecognized response id: 0x%x\n",
 546                                 payload[RESPONSE_ID]);
 547                         break;
 548                 }
 549         }
 550
 551         if (!ts->suspending && device_may_wakeup(&client->dev))
 552                 pm_relax(&client->dev);
 553
 554         dev_dbg(&client->dev, "finished interrupt\n");
 555
 556         return IRQ_HANDLED;
 557 }
 558
 559 static int zforce_input_open(struct input_dev *dev)
 560 {
 561         struct zforce_ts *ts = input_get_drvdata(dev);
 562         int ret;
 563
 564         ret = zforce_start(ts);
 565         if (ret)
 566                 return ret;
 567
 568         return 0;
 569 }
 570
 571 static void zforce_input_close(struct input_dev *dev)
 572 {
 573         struct zforce_ts *ts = input_get_drvdata(dev);
 574         struct i2c_client *client = ts->client;
 575         int ret;
 576
 577         ret = zforce_stop(ts);
 578         if (ret)
 579                 dev_warn(&client->dev, "stopping zforce failed\n");
 580
 581         return;
 582 }
 583
 584 #ifdef CONFIG_PM_SLEEP
 585 static int zforce_suspend(struct device *dev)
 586 {
 587         struct i2c_client *client = to_i2c_client(dev);
 588         struct zforce_ts *ts = i2c_get_clientdata(client);
 589         struct input_dev *input = ts->input;
 590         int ret = 0;
 591
 592         mutex_lock(&input->mutex);
 593         ts->suspending = true;
 594
 595         /*
 596          * When configured as a wakeup source device should always wake
 597          * the system, therefore start device if necessary.
 598          */
 599         if (device_may_wakeup(&client->dev)) {
 600                 dev_dbg(&client->dev, "suspend while being a wakeup source\n");
 601
 602                 /* Need to start device, if not open, to be a wakeup source. */
 603                 if (!input->users) {
 604                         ret = zforce_start(ts);
 605                         if (ret)
 606                                 goto unlock;
 607                 }
 608
 609                 enable_irq_wake(client->irq);
 610         } else if (input->users) {
 611                 dev_dbg(&client->dev, "suspend without being a wakeup source\n");
 612
 613                 ret = zforce_stop(ts);
 614                 if (ret)
 615                         goto unlock;
 616
 617                 disable_irq(client->irq);
 618         }
 619
 620         ts->suspended = true;
 621
 622 unlock:
 623         ts->suspending = false;
 624         mutex_unlock(&input->mutex);
 625
 626         return ret;
 627 }
 628
 629 static int zforce_resume(struct device *dev)
 630 {
 631         struct i2c_client *client = to_i2c_client(dev);
 632         struct zforce_ts *ts = i2c_get_clientdata(client);
 633         struct input_dev *input = ts->input;
 634         int ret = 0;
 635
 636         mutex_lock(&input->mutex);
 637
 638         ts->suspended = false;
 639
 640         if (device_may_wakeup(&client->dev)) {
 641                 dev_dbg(&client->dev, "resume from being a wakeup source\n");
 642
 643                 disable_irq_wake(client->irq);
 644
 645                 /* need to stop device if it was not open on suspend */
 646                 if (!input->users) {
 647                         ret = zforce_stop(ts);
 648                         if (ret)
 649                                 goto unlock;
 650                 }
 651         } else if (input->users) {
 652                 dev_dbg(&client->dev, "resume without being a wakeup source\n");
 653
 654                 enable_irq(client->irq);
 655
 656                 ret = zforce_start(ts);
 657                 if (ret < 0)
 658                         goto unlock;
 659         }
 660
 661 unlock:
 662         mutex_unlock(&input->mutex);
 663
 664         return ret;
 665 }
 666 #endif
 667
 668 static SIMPLE_DEV_PM_OPS(zforce_pm_ops, zforce_suspend, zforce_resume);
 669
 670 static void zforce_reset(void *data)
 671 {
 672         struct zforce_ts *ts = data;
 673
 674         gpio_set_value(ts->pdata->gpio_rst, 0);
 675 }
 676
 677 static int zforce_probe(struct i2c_client *client,
 678                         const struct i2c_device_id *id)
 679 {
 680         const struct zforce_ts_platdata *pdata = dev_get_platdata(&client->dev);
 681         struct zforce_ts *ts;
 682         struct input_dev *input_dev;
 683         int ret;
 684
 685         if (!pdata)
 686                 return -EINVAL;
 687
 688         ts = devm_kzalloc(&client->dev, sizeof(struct zforce_ts), GFP_KERNEL);
 689         if (!ts)
 690                 return -ENOMEM;
 691
 692         ret = devm_gpio_request_one(&client->dev, pdata->gpio_int, GPIOF_IN,
 693                                     "zforce_ts_int");
 694         if (ret) {
 695                 dev_err(&client->dev, "request of gpio %d failed, %d\n",
 696                         pdata->gpio_int, ret);
 697                 return ret;
 698         }
 699
 700         ret = devm_gpio_request_one(&client->dev, pdata->gpio_rst,
 701                                     GPIOF_OUT_INIT_LOW, "zforce_ts_rst");
 702         if (ret) {
 703                 dev_err(&client->dev, "request of gpio %d failed, %d\n",
 704                         pdata->gpio_rst, ret);
 705                 return ret;
 706         }
 707
 708         ret = devm_add_action(&client->dev, zforce_reset, ts);
 709         if (ret) {
 710                 dev_err(&client->dev, "failed to register reset action, %d\n",
 711                         ret);
 712                 return ret;
 713         }
 714
 715         snprintf(ts->phys, sizeof(ts->phys),
 716                  "%s/input0", dev_name(&client->dev));
 717
 718         input_dev = devm_input_allocate_device(&client->dev);
 719         if (!input_dev) {
 720                 dev_err(&client->dev, "could not allocate input device\n");
 721                 return -ENOMEM;
 722         }
 723
 724         mutex_init(&ts->access_mutex);
 725         mutex_init(&ts->command_mutex);
 726
 727         ts->pdata = pdata;
 728         ts->client = client;
 729         ts->input = input_dev;
 730
 731         input_dev->name = "Neonode zForce touchscreen";
 732         input_dev->phys = ts->phys;
 733         input_dev->id.bustype = BUS_I2C;
 734
 735         input_dev->open = zforce_input_open;
 736         input_dev->close = zforce_input_close;
 737
 738         __set_bit(EV_KEY, input_dev->evbit);
 739         __set_bit(EV_SYN, input_dev->evbit);
 740         __set_bit(EV_ABS, input_dev->evbit);
 741
 742         /* For multi touch */
 743         input_set_abs_params(input_dev, ABS_MT_POSITION_X, 0,
 744                              pdata->x_max, 0, 0);
 745         input_set_abs_params(input_dev, ABS_MT_POSITION_Y, 0,
 746                              pdata->y_max, 0, 0);
 747
 748         input_set_abs_params(input_dev, ABS_MT_TOUCH_MAJOR, 0,
 749                              ZFORCE_MAX_AREA, 0, 0);
 750         input_set_abs_params(input_dev, ABS_MT_TOUCH_MINOR, 0,
 751                              ZFORCE_MAX_AREA, 0, 0);
 752         input_set_abs_params(input_dev, ABS_MT_ORIENTATION, 0, 1, 0, 0);
 753         input_mt_init_slots(input_dev, ZFORCE_REPORT_POINTS, INPUT_MT_DIRECT);
 754
 755         input_set_drvdata(ts->input, ts);
 756
 757         init_completion(&ts->command_done);
 758
 759         /*
 760          * The zforce pulls the interrupt low when it has data ready.
 761          * After it is triggered the isr thread runs until all the available
 762          * packets have been read and the interrupt is high again.
 763          * Therefore we can trigger the interrupt anytime it is low and do
 764          * not need to limit it to the interrupt edge.
 765          */
 766         ret = devm_request_threaded_irq(&client->dev, client->irq, NULL,
 767                                         zforce_interrupt,
 768                                         IRQF_TRIGGER_LOW | IRQF_ONESHOT,
 769                                         input_dev->name, ts);
 770         if (ret) {
 771                 dev_err(&client->dev, "irq %d request failed\n", client->irq);
 772                 return ret;
 773         }
 774
 775         i2c_set_clientdata(client, ts);
 776
 777         /* let the controller boot */
 778         gpio_set_value(pdata->gpio_rst, 1);
 779
 780         ts->command_waiting = NOTIFICATION_BOOTCOMPLETE;
 781         if (wait_for_completion_timeout(&ts->command_done, WAIT_TIMEOUT) == 0)
 782                 dev_warn(&client->dev, "bootcomplete timed out\n");
 783
 784         /* need to start device to get version information */
 785         ret = zforce_command_wait(ts, COMMAND_INITIALIZE);
 786         if (ret) {
 787                 dev_err(&client->dev, "unable to initialize, %d\n", ret);
 788                 return ret;
 789         }
 790
 791         /* this gets the firmware version among other informations */
 792         ret = zforce_command_wait(ts, COMMAND_STATUS);
 793         if (ret < 0) {
 794                 dev_err(&client->dev, "couldn't get status, %d\n", ret);
 795                 zforce_stop(ts);
 796                 return ret;
 797         }
 798
 799         /* stop device and put it into sleep until it is opened */
 800         ret = zforce_stop(ts);
 801         if (ret < 0)
 802                 return ret;
 803
 804         device_set_wakeup_capable(&client->dev, true);
 805
 806         ret = input_register_device(input_dev);
 807         if (ret) {
 808                 dev_err(&client->dev, "could not register input device, %d\n",
 809                         ret);
 810                 return ret;
 811         }
 812
 813         return 0;
 814 }
 815
 816 static struct i2c_device_id zforce_idtable[] = {
 817         { "zforce-ts", 0 },
 818         { }
 819 };
 820 MODULE_DEVICE_TABLE(i2c, zforce_idtable);
 821
 822 static struct i2c_driver zforce_driver = {
 823         .driver = {
 824                 .owner  = THIS_MODULE,
 825                 .name   = "zforce-ts",
 826                 .pm     = &zforce_pm_ops,
 827         },
 828         .probe          = zforce_probe,
 829         .id_table       = zforce_idtable,
 830 };
 831
 832 module_i2c_driver(zforce_driver);
 833
 834 MODULE_AUTHOR("Heiko Stuebner <heiko@sntech.de>");
 835 MODULE_DESCRIPTION("zForce TouchScreen Driver");
 836 MODULE_LICENSE("GPL");