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_irq(int irq, void *dev_id)
 459 {
 460         struct zforce_ts *ts = dev_id;
 461         struct i2c_client *client = ts->client;
 462
 463         if (ts->suspended && device_may_wakeup(&client->dev))
 464                 pm_wakeup_event(&client->dev, 500);
 465
 466         return IRQ_WAKE_THREAD;
 467 }
 468
 469 static irqreturn_t zforce_irq_thread(int irq, void *dev_id)
 470 {
 471         struct zforce_ts *ts = dev_id;
 472         struct i2c_client *client = ts->client;
 473         const struct zforce_ts_platdata *pdata = dev_get_platdata(&client->dev);
 474         int ret;
 475         u8 payload_buffer[512];
 476         u8 *payload;
 477
 478         /*
 479          * When still suspended, return.
 480          * Due to the level-interrupt we will get re-triggered later.
 481          */
 482         if (ts->suspended) {
 483                 msleep(20);
 484                 return IRQ_HANDLED;
 485         }
 486
 487         dev_dbg(&client->dev, "handling interrupt\n");
 488
 489         /* Don't emit wakeup events from commands run by zforce_suspend */
 490         if (!ts->suspending && device_may_wakeup(&client->dev))
 491                 pm_stay_awake(&client->dev);
 492
 493         while (!gpio_get_value(pdata->gpio_int)) {
 494                 ret = zforce_read_packet(ts, payload_buffer);
 495                 if (ret < 0) {
 496                         dev_err(&client->dev, "could not read packet, ret: %d\n",
 497                                 ret);
 498                         break;
 499                 }
 500
 501                 payload =  &payload_buffer[PAYLOAD_BODY];
 502
 503                 switch (payload[RESPONSE_ID]) {
 504                 case NOTIFICATION_TOUCH:
 505                         /*
 506                          * Always report touch-events received while
 507                          * suspending, when being a wakeup source
 508                          */
 509                         if (ts->suspending && device_may_wakeup(&client->dev))
 510                                 pm_wakeup_event(&client->dev, 500);
 511                         zforce_touch_event(ts, &payload[RESPONSE_DATA]);
 512                         break;
 513
 514                 case NOTIFICATION_BOOTCOMPLETE:
 515                         ts->boot_complete = payload[RESPONSE_DATA];
 516                         zforce_complete(ts, payload[RESPONSE_ID], 0);
 517                         break;
 518
 519                 case RESPONSE_INITIALIZE:
 520                 case RESPONSE_DEACTIVATE:
 521                 case RESPONSE_SETCONFIG:
 522                 case RESPONSE_RESOLUTION:
 523                 case RESPONSE_SCANFREQ:
 524                         zforce_complete(ts, payload[RESPONSE_ID],
 525                                         payload[RESPONSE_DATA]);
 526                         break;
 527
 528                 case RESPONSE_STATUS:
 529                         /*
 530                          * Version Payload Results
 531                          * [2:major] [2:minor] [2:build] [2:rev]
 532                          */
 533                         ts->version_major = (payload[RESPONSE_DATA + 1] << 8) |
 534                                                 payload[RESPONSE_DATA];
 535                         ts->version_minor = (payload[RESPONSE_DATA + 3] << 8) |
 536                                                 payload[RESPONSE_DATA + 2];
 537                         ts->version_build = (payload[RESPONSE_DATA + 5] << 8) |
 538                                                 payload[RESPONSE_DATA + 4];
 539                         ts->version_rev   = (payload[RESPONSE_DATA + 7] << 8) |
 540                                                 payload[RESPONSE_DATA + 6];
 541                         dev_dbg(&ts->client->dev, "Firmware Version %04x:%04x %04x:%04x\n",
 542                                 ts->version_major, ts->version_minor,
 543                                 ts->version_build, ts->version_rev);
 544
 545                         zforce_complete(ts, payload[RESPONSE_ID], 0);
 546                         break;
 547
 548                 case NOTIFICATION_INVALID_COMMAND:
 549                         dev_err(&ts->client->dev, "invalid command: 0x%x\n",
 550                                 payload[RESPONSE_DATA]);
 551                         break;
 552
 553                 default:
 554                         dev_err(&ts->client->dev, "unrecognized response id: 0x%x\n",
 555                                 payload[RESPONSE_ID]);
 556                         break;
 557                 }
 558         }
 559
 560         if (!ts->suspending && device_may_wakeup(&client->dev))
 561                 pm_relax(&client->dev);
 562
 563         dev_dbg(&client->dev, "finished interrupt\n");
 564
 565         return IRQ_HANDLED;
 566 }
 567
 568 static int zforce_input_open(struct input_dev *dev)
 569 {
 570         struct zforce_ts *ts = input_get_drvdata(dev);
 571         int ret;
 572
 573         ret = zforce_start(ts);
 574         if (ret)
 575                 return ret;
 576
 577         return 0;
 578 }
 579
 580 static void zforce_input_close(struct input_dev *dev)
 581 {
 582         struct zforce_ts *ts = input_get_drvdata(dev);
 583         struct i2c_client *client = ts->client;
 584         int ret;
 585
 586         ret = zforce_stop(ts);
 587         if (ret)
 588                 dev_warn(&client->dev, "stopping zforce failed\n");
 589
 590         return;
 591 }
 592
 593 #ifdef CONFIG_PM_SLEEP
 594 static int zforce_suspend(struct device *dev)
 595 {
 596         struct i2c_client *client = to_i2c_client(dev);
 597         struct zforce_ts *ts = i2c_get_clientdata(client);
 598         struct input_dev *input = ts->input;
 599         int ret = 0;
 600
 601         mutex_lock(&input->mutex);
 602         ts->suspending = true;
 603
 604         /*
 605          * When configured as a wakeup source device should always wake
 606          * the system, therefore start device if necessary.
 607          */
 608         if (device_may_wakeup(&client->dev)) {
 609                 dev_dbg(&client->dev, "suspend while being a wakeup source\n");
 610
 611                 /* Need to start device, if not open, to be a wakeup source. */
 612                 if (!input->users) {
 613                         ret = zforce_start(ts);
 614                         if (ret)
 615                                 goto unlock;
 616                 }
 617
 618                 enable_irq_wake(client->irq);
 619         } else if (input->users) {
 620                 dev_dbg(&client->dev, "suspend without being a wakeup source\n");
 621
 622                 ret = zforce_stop(ts);
 623                 if (ret)
 624                         goto unlock;
 625
 626                 disable_irq(client->irq);
 627         }
 628
 629         ts->suspended = true;
 630
 631 unlock:
 632         ts->suspending = false;
 633         mutex_unlock(&input->mutex);
 634
 635         return ret;
 636 }
 637
 638 static int zforce_resume(struct device *dev)
 639 {
 640         struct i2c_client *client = to_i2c_client(dev);
 641         struct zforce_ts *ts = i2c_get_clientdata(client);
 642         struct input_dev *input = ts->input;
 643         int ret = 0;
 644
 645         mutex_lock(&input->mutex);
 646
 647         ts->suspended = false;
 648
 649         if (device_may_wakeup(&client->dev)) {
 650                 dev_dbg(&client->dev, "resume from being a wakeup source\n");
 651
 652                 disable_irq_wake(client->irq);
 653
 654                 /* need to stop device if it was not open on suspend */
 655                 if (!input->users) {
 656                         ret = zforce_stop(ts);
 657                         if (ret)
 658                                 goto unlock;
 659                 }
 660         } else if (input->users) {
 661                 dev_dbg(&client->dev, "resume without being a wakeup source\n");
 662
 663                 enable_irq(client->irq);
 664
 665                 ret = zforce_start(ts);
 666                 if (ret < 0)
 667                         goto unlock;
 668         }
 669
 670 unlock:
 671         mutex_unlock(&input->mutex);
 672
 673         return ret;
 674 }
 675 #endif
 676
 677 static SIMPLE_DEV_PM_OPS(zforce_pm_ops, zforce_suspend, zforce_resume);
 678
 679 static void zforce_reset(void *data)
 680 {
 681         struct zforce_ts *ts = data;
 682
 683         gpio_set_value(ts->pdata->gpio_rst, 0);
 684 }
 685
 686 static int zforce_probe(struct i2c_client *client,
 687                         const struct i2c_device_id *id)
 688 {
 689         const struct zforce_ts_platdata *pdata = dev_get_platdata(&client->dev);
 690         struct zforce_ts *ts;
 691         struct input_dev *input_dev;
 692         int ret;
 693
 694         if (!pdata)
 695                 return -EINVAL;
 696
 697         ts = devm_kzalloc(&client->dev, sizeof(struct zforce_ts), GFP_KERNEL);
 698         if (!ts)
 699                 return -ENOMEM;
 700
 701         ret = devm_gpio_request_one(&client->dev, pdata->gpio_int, GPIOF_IN,
 702                                     "zforce_ts_int");
 703         if (ret) {
 704                 dev_err(&client->dev, "request of gpio %d failed, %d\n",
 705                         pdata->gpio_int, ret);
 706                 return ret;
 707         }
 708
 709         ret = devm_gpio_request_one(&client->dev, pdata->gpio_rst,
 710                                     GPIOF_OUT_INIT_LOW, "zforce_ts_rst");
 711         if (ret) {
 712                 dev_err(&client->dev, "request of gpio %d failed, %d\n",
 713                         pdata->gpio_rst, ret);
 714                 return ret;
 715         }
 716
 717         ret = devm_add_action(&client->dev, zforce_reset, ts);
 718         if (ret) {
 719                 dev_err(&client->dev, "failed to register reset action, %d\n",
 720                         ret);
 721                 return ret;
 722         }
 723
 724         snprintf(ts->phys, sizeof(ts->phys),
 725                  "%s/input0", dev_name(&client->dev));
 726
 727         input_dev = devm_input_allocate_device(&client->dev);
 728         if (!input_dev) {
 729                 dev_err(&client->dev, "could not allocate input device\n");
 730                 return -ENOMEM;
 731         }
 732
 733         mutex_init(&ts->access_mutex);
 734         mutex_init(&ts->command_mutex);
 735
 736         ts->pdata = pdata;
 737         ts->client = client;
 738         ts->input = input_dev;
 739
 740         input_dev->name = "Neonode zForce touchscreen";
 741         input_dev->phys = ts->phys;
 742         input_dev->id.bustype = BUS_I2C;
 743
 744         input_dev->open = zforce_input_open;
 745         input_dev->close = zforce_input_close;
 746
 747         __set_bit(EV_KEY, input_dev->evbit);
 748         __set_bit(EV_SYN, input_dev->evbit);
 749         __set_bit(EV_ABS, input_dev->evbit);
 750
 751         /* For multi touch */
 752         input_set_abs_params(input_dev, ABS_MT_POSITION_X, 0,
 753                              pdata->x_max, 0, 0);
 754         input_set_abs_params(input_dev, ABS_MT_POSITION_Y, 0,
 755                              pdata->y_max, 0, 0);
 756
 757         input_set_abs_params(input_dev, ABS_MT_TOUCH_MAJOR, 0,
 758                              ZFORCE_MAX_AREA, 0, 0);
 759         input_set_abs_params(input_dev, ABS_MT_TOUCH_MINOR, 0,
 760                              ZFORCE_MAX_AREA, 0, 0);
 761         input_set_abs_params(input_dev, ABS_MT_ORIENTATION, 0, 1, 0, 0);
 762         input_mt_init_slots(input_dev, ZFORCE_REPORT_POINTS, INPUT_MT_DIRECT);
 763
 764         input_set_drvdata(ts->input, ts);
 765
 766         init_completion(&ts->command_done);
 767
 768         /*
 769          * The zforce pulls the interrupt low when it has data ready.
 770          * After it is triggered the isr thread runs until all the available
 771          * packets have been read and the interrupt is high again.
 772          * Therefore we can trigger the interrupt anytime it is low and do
 773          * not need to limit it to the interrupt edge.
 774          */
 775         ret = devm_request_threaded_irq(&client->dev, client->irq,
 776                                         zforce_irq, zforce_irq_thread,
 777                                         IRQF_TRIGGER_LOW | IRQF_ONESHOT,
 778                                         input_dev->name, ts);
 779         if (ret) {
 780                 dev_err(&client->dev, "irq %d request failed\n", client->irq);
 781                 return ret;
 782         }
 783
 784         i2c_set_clientdata(client, ts);
 785
 786         /* let the controller boot */
 787         gpio_set_value(pdata->gpio_rst, 1);
 788
 789         ts->command_waiting = NOTIFICATION_BOOTCOMPLETE;
 790         if (wait_for_completion_timeout(&ts->command_done, WAIT_TIMEOUT) == 0)
 791                 dev_warn(&client->dev, "bootcomplete timed out\n");
 792
 793         /* need to start device to get version information */
 794         ret = zforce_command_wait(ts, COMMAND_INITIALIZE);
 795         if (ret) {
 796                 dev_err(&client->dev, "unable to initialize, %d\n", ret);
 797                 return ret;
 798         }
 799
 800         /* this gets the firmware version among other informations */
 801         ret = zforce_command_wait(ts, COMMAND_STATUS);
 802         if (ret < 0) {
 803                 dev_err(&client->dev, "couldn't get status, %d\n", ret);
 804                 zforce_stop(ts);
 805                 return ret;
 806         }
 807
 808         /* stop device and put it into sleep until it is opened */
 809         ret = zforce_stop(ts);
 810         if (ret < 0)
 811                 return ret;
 812
 813         device_set_wakeup_capable(&client->dev, true);
 814
 815         ret = input_register_device(input_dev);
 816         if (ret) {
 817                 dev_err(&client->dev, "could not register input device, %d\n",
 818                         ret);
 819                 return ret;
 820         }
 821
 822         return 0;
 823 }
 824
 825 static struct i2c_device_id zforce_idtable[] = {
 826         { "zforce-ts", 0 },
 827         { }
 828 };
 829 MODULE_DEVICE_TABLE(i2c, zforce_idtable);
 830
 831 static struct i2c_driver zforce_driver = {
 832         .driver = {
 833                 .owner  = THIS_MODULE,
 834                 .name   = "zforce-ts",
 835                 .pm     = &zforce_pm_ops,
 836         },
 837         .probe          = zforce_probe,
 838         .id_table       = zforce_idtable,
 839 };
 840
 841 module_i2c_driver(zforce_driver);
 842
 843 MODULE_AUTHOR("Heiko Stuebner <heiko@sntech.de>");
 844 MODULE_DESCRIPTION("zForce TouchScreen Driver");
 845 MODULE_LICENSE("GPL");