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 #include <linux/of.h>
  33 #include <linux/of_gpio.h>
  34
  35 #define WAIT_TIMEOUT            msecs_to_jiffies(1000)
  36
  37 #define FRAME_START             0xee
  38 #define FRAME_MAXSIZE           257
  39
  40 /* Offsets of the different parts of the payload the controller sends */
  41 #define PAYLOAD_HEADER          0
  42 #define PAYLOAD_LENGTH          1
  43 #define PAYLOAD_BODY            2
  44
  45 /* Response offsets */
  46 #define RESPONSE_ID             0
  47 #define RESPONSE_DATA           1
  48
  49 /* Commands */
  50 #define COMMAND_DEACTIVATE      0x00
  51 #define COMMAND_INITIALIZE      0x01
  52 #define COMMAND_RESOLUTION      0x02
  53 #define COMMAND_SETCONFIG       0x03
  54 #define COMMAND_DATAREQUEST     0x04
  55 #define COMMAND_SCANFREQ        0x08
  56 #define COMMAND_STATUS          0X1e
  57
  58 /*
  59  * Responses the controller sends as a result of
  60  * command requests
  61  */
  62 #define RESPONSE_DEACTIVATE     0x00
  63 #define RESPONSE_INITIALIZE     0x01
  64 #define RESPONSE_RESOLUTION     0x02
  65 #define RESPONSE_SETCONFIG      0x03
  66 #define RESPONSE_SCANFREQ       0x08
  67 #define RESPONSE_STATUS         0X1e
  68
  69 /*
  70  * Notifications are sent by the touch controller without
  71  * being requested by the driver and include for example
  72  * touch indications
  73  */
  74 #define NOTIFICATION_TOUCH              0x04
  75 #define NOTIFICATION_BOOTCOMPLETE       0x07
  76 #define NOTIFICATION_OVERRUN            0x25
  77 #define NOTIFICATION_PROXIMITY          0x26
  78 #define NOTIFICATION_INVALID_COMMAND    0xfe
  79
  80 #define ZFORCE_REPORT_POINTS            2
  81 #define ZFORCE_MAX_AREA                 0xff
  82
  83 #define STATE_DOWN                      0
  84 #define STATE_MOVE                      1
  85 #define STATE_UP                        2
  86
  87 #define SETCONFIG_DUALTOUCH             (1 << 0)
  88
  89 struct zforce_point {
  90         int coord_x;
  91         int coord_y;
  92         int state;
  93         int id;
  94         int area_major;
  95         int area_minor;
  96         int orientation;
  97         int pressure;
  98         int prblty;
  99 };
 100
 101 /*
 102  * @client              the i2c_client
 103  * @input               the input device
 104  * @suspending          in the process of going to suspend (don't emit wakeup
 105  *                      events for commands executed to suspend the device)
 106  * @suspended           device suspended
 107  * @access_mutex        serialize i2c-access, to keep multipart reads together
 108  * @command_done        completion to wait for the command result
 109  * @command_mutex       serialize commands sent to the ic
 110  * @command_waiting     the id of the command that is currently waiting
 111  *                      for a result
 112  * @command_result      returned result of the command
 113  */
 114 struct zforce_ts {
 115         struct i2c_client       *client;
 116         struct input_dev        *input;
 117         const struct zforce_ts_platdata *pdata;
 118         char                    phys[32];
 119
 120         bool                    suspending;
 121         bool                    suspended;
 122         bool                    boot_complete;
 123
 124         /* Firmware version information */
 125         u16                     version_major;
 126         u16                     version_minor;
 127         u16                     version_build;
 128         u16                     version_rev;
 129
 130         struct mutex            access_mutex;
 131
 132         struct completion       command_done;
 133         struct mutex            command_mutex;
 134         int                     command_waiting;
 135         int                     command_result;
 136 };
 137
 138 static int zforce_command(struct zforce_ts *ts, u8 cmd)
 139 {
 140         struct i2c_client *client = ts->client;
 141         char buf[3];
 142         int ret;
 143
 144         dev_dbg(&client->dev, "%s: 0x%x\n", __func__, cmd);
 145
 146         buf[0] = FRAME_START;
 147         buf[1] = 1; /* data size, command only */
 148         buf[2] = cmd;
 149
 150         mutex_lock(&ts->access_mutex);
 151         ret = i2c_master_send(client, &buf[0], ARRAY_SIZE(buf));
 152         mutex_unlock(&ts->access_mutex);
 153         if (ret < 0) {
 154                 dev_err(&client->dev, "i2c send data request error: %d\n", ret);
 155                 return ret;
 156         }
 157
 158         return 0;
 159 }
 160
 161 static int zforce_send_wait(struct zforce_ts *ts, const char *buf, int len)
 162 {
 163         struct i2c_client *client = ts->client;
 164         int ret;
 165
 166         ret = mutex_trylock(&ts->command_mutex);
 167         if (!ret) {
 168                 dev_err(&client->dev, "already waiting for a command\n");
 169                 return -EBUSY;
 170         }
 171
 172         dev_dbg(&client->dev, "sending %d bytes for command 0x%x\n",
 173                 buf[1], buf[2]);
 174
 175         ts->command_waiting = buf[2];
 176
 177         mutex_lock(&ts->access_mutex);
 178         ret = i2c_master_send(client, buf, len);
 179         mutex_unlock(&ts->access_mutex);
 180         if (ret < 0) {
 181                 dev_err(&client->dev, "i2c send data request error: %d\n", ret);
 182                 goto unlock;
 183         }
 184
 185         dev_dbg(&client->dev, "waiting for result for command 0x%x\n", buf[2]);
 186
 187         if (wait_for_completion_timeout(&ts->command_done, WAIT_TIMEOUT) == 0) {
 188                 ret = -ETIME;
 189                 goto unlock;
 190         }
 191
 192         ret = ts->command_result;
 193
 194 unlock:
 195         mutex_unlock(&ts->command_mutex);
 196         return ret;
 197 }
 198
 199 static int zforce_command_wait(struct zforce_ts *ts, u8 cmd)
 200 {
 201         struct i2c_client *client = ts->client;
 202         char buf[3];
 203         int ret;
 204
 205         dev_dbg(&client->dev, "%s: 0x%x\n", __func__, cmd);
 206
 207         buf[0] = FRAME_START;
 208         buf[1] = 1; /* data size, command only */
 209         buf[2] = cmd;
 210
 211         ret = zforce_send_wait(ts, &buf[0], ARRAY_SIZE(buf));
 212         if (ret < 0) {
 213                 dev_err(&client->dev, "i2c send data request error: %d\n", ret);
 214                 return ret;
 215         }
 216
 217         return 0;
 218 }
 219
 220 static int zforce_resolution(struct zforce_ts *ts, u16 x, u16 y)
 221 {
 222         struct i2c_client *client = ts->client;
 223         char buf[7] = { FRAME_START, 5, COMMAND_RESOLUTION,
 224                         (x & 0xff), ((x >> 8) & 0xff),
 225                         (y & 0xff), ((y >> 8) & 0xff) };
 226
 227         dev_dbg(&client->dev, "set resolution to (%d,%d)\n", x, y);
 228
 229         return zforce_send_wait(ts, &buf[0], ARRAY_SIZE(buf));
 230 }
 231
 232 static int zforce_scan_frequency(struct zforce_ts *ts, u16 idle, u16 finger,
 233                                  u16 stylus)
 234 {
 235         struct i2c_client *client = ts->client;
 236         char buf[9] = { FRAME_START, 7, COMMAND_SCANFREQ,
 237                         (idle & 0xff), ((idle >> 8) & 0xff),
 238                         (finger & 0xff), ((finger >> 8) & 0xff),
 239                         (stylus & 0xff), ((stylus >> 8) & 0xff) };
 240
 241         dev_dbg(&client->dev,
 242                 "set scan frequency to (idle: %d, finger: %d, stylus: %d)\n",
 243                 idle, finger, stylus);
 244
 245         return zforce_send_wait(ts, &buf[0], ARRAY_SIZE(buf));
 246 }
 247
 248 static int zforce_setconfig(struct zforce_ts *ts, char b1)
 249 {
 250         struct i2c_client *client = ts->client;
 251         char buf[7] = { FRAME_START, 5, COMMAND_SETCONFIG,
 252                         b1, 0, 0, 0 };
 253
 254         dev_dbg(&client->dev, "set config to (%d)\n", b1);
 255
 256         return zforce_send_wait(ts, &buf[0], ARRAY_SIZE(buf));
 257 }
 258
 259 static int zforce_start(struct zforce_ts *ts)
 260 {
 261         struct i2c_client *client = ts->client;
 262         const struct zforce_ts_platdata *pdata = ts->pdata;
 263         int ret;
 264
 265         dev_dbg(&client->dev, "starting device\n");
 266
 267         ret = zforce_command_wait(ts, COMMAND_INITIALIZE);
 268         if (ret) {
 269                 dev_err(&client->dev, "Unable to initialize, %d\n", ret);
 270                 return ret;
 271         }
 272
 273         ret = zforce_resolution(ts, pdata->x_max, pdata->y_max);
 274         if (ret) {
 275                 dev_err(&client->dev, "Unable to set resolution, %d\n", ret);
 276                 goto error;
 277         }
 278
 279         ret = zforce_scan_frequency(ts, 10, 50, 50);
 280         if (ret) {
 281                 dev_err(&client->dev, "Unable to set scan frequency, %d\n",
 282                         ret);
 283                 goto error;
 284         }
 285
 286         ret = zforce_setconfig(ts, SETCONFIG_DUALTOUCH);
 287         if (ret) {
 288                 dev_err(&client->dev, "Unable to set config\n");
 289                 goto error;
 290         }
 291
 292         /* start sending touch events */
 293         ret = zforce_command(ts, COMMAND_DATAREQUEST);
 294         if (ret) {
 295                 dev_err(&client->dev, "Unable to request data\n");
 296                 goto error;
 297         }
 298
 299         /*
 300          * Per NN, initial cal. take max. of 200msec.
 301          * Allow time to complete this calibration
 302          */
 303         msleep(200);
 304
 305         return 0;
 306
 307 error:
 308         zforce_command_wait(ts, COMMAND_DEACTIVATE);
 309         return ret;
 310 }
 311
 312 static int zforce_stop(struct zforce_ts *ts)
 313 {
 314         struct i2c_client *client = ts->client;
 315         int ret;
 316
 317         dev_dbg(&client->dev, "stopping device\n");
 318
 319         /* Deactivates touch sensing and puts the device into sleep. */
 320         ret = zforce_command_wait(ts, COMMAND_DEACTIVATE);
 321         if (ret != 0) {
 322                 dev_err(&client->dev, "could not deactivate device, %d\n",
 323                         ret);
 324                 return ret;
 325         }
 326
 327         return 0;
 328 }
 329
 330 static int zforce_touch_event(struct zforce_ts *ts, u8 *payload)
 331 {
 332         struct i2c_client *client = ts->client;
 333         const struct zforce_ts_platdata *pdata = ts->pdata;
 334         struct zforce_point point;
 335         int count, i, num = 0;
 336
 337         count = payload[0];
 338         if (count > ZFORCE_REPORT_POINTS) {
 339                 dev_warn(&client->dev,
 340                          "too many coordinates %d, expected max %d\n",
 341                          count, ZFORCE_REPORT_POINTS);
 342                 count = ZFORCE_REPORT_POINTS;
 343         }
 344
 345         for (i = 0; i < count; i++) {
 346                 point.coord_x =
 347                         payload[9 * i + 2] << 8 | payload[9 * i + 1];
 348                 point.coord_y =
 349                         payload[9 * i + 4] << 8 | payload[9 * i + 3];
 350
 351                 if (point.coord_x > pdata->x_max ||
 352                     point.coord_y > pdata->y_max) {
 353                         dev_warn(&client->dev, "coordinates (%d,%d) invalid\n",
 354                                 point.coord_x, point.coord_y);
 355                         point.coord_x = point.coord_y = 0;
 356                 }
 357
 358                 point.state = payload[9 * i + 5] & 0x03;
 359                 point.id = (payload[9 * i + 5] & 0xfc) >> 2;
 360
 361                 /* determine touch major, minor and orientation */
 362                 point.area_major = max(payload[9 * i + 6],
 363                                           payload[9 * i + 7]);
 364                 point.area_minor = min(payload[9 * i + 6],
 365                                           payload[9 * i + 7]);
 366                 point.orientation = payload[9 * i + 6] > payload[9 * i + 7];
 367
 368                 point.pressure = payload[9 * i + 8];
 369                 point.prblty = payload[9 * i + 9];
 370
 371                 dev_dbg(&client->dev,
 372                         "point %d/%d: state %d, id %d, pressure %d, prblty %d, x %d, y %d, amajor %d, aminor %d, ori %d\n",
 373                         i, count, point.state, point.id,
 374                         point.pressure, point.prblty,
 375                         point.coord_x, point.coord_y,
 376                         point.area_major, point.area_minor,
 377                         point.orientation);
 378
 379                 /* the zforce id starts with "1", so needs to be decreased */
 380                 input_mt_slot(ts->input, point.id - 1);
 381
 382                 input_mt_report_slot_state(ts->input, MT_TOOL_FINGER,
 383                                                 point.state != STATE_UP);
 384
 385                 if (point.state != STATE_UP) {
 386                         input_report_abs(ts->input, ABS_MT_POSITION_X,
 387                                          point.coord_x);
 388                         input_report_abs(ts->input, ABS_MT_POSITION_Y,
 389                                          point.coord_y);
 390                         input_report_abs(ts->input, ABS_MT_TOUCH_MAJOR,
 391                                          point.area_major);
 392                         input_report_abs(ts->input, ABS_MT_TOUCH_MINOR,
 393                                          point.area_minor);
 394                         input_report_abs(ts->input, ABS_MT_ORIENTATION,
 395                                          point.orientation);
 396                         num++;
 397                 }
 398         }
 399
 400         input_mt_sync_frame(ts->input);
 401
 402         input_mt_report_finger_count(ts->input, num);
 403
 404         input_sync(ts->input);
 405
 406         return 0;
 407 }
 408
 409 static int zforce_read_packet(struct zforce_ts *ts, u8 *buf)
 410 {
 411         struct i2c_client *client = ts->client;
 412         int ret;
 413
 414         mutex_lock(&ts->access_mutex);
 415
 416         /* read 2 byte message header */
 417         ret = i2c_master_recv(client, buf, 2);
 418         if (ret < 0) {
 419                 dev_err(&client->dev, "error reading header: %d\n", ret);
 420                 goto unlock;
 421         }
 422
 423         if (buf[PAYLOAD_HEADER] != FRAME_START) {
 424                 dev_err(&client->dev, "invalid frame start: %d\n", buf[0]);
 425                 ret = -EIO;
 426                 goto unlock;
 427         }
 428
 429         if (buf[PAYLOAD_LENGTH] == 0) {
 430                 dev_err(&client->dev, "invalid payload length: %d\n",
 431                         buf[PAYLOAD_LENGTH]);
 432                 ret = -EIO;
 433                 goto unlock;
 434         }
 435
 436         /* read the message */
 437         ret = i2c_master_recv(client, &buf[PAYLOAD_BODY], buf[PAYLOAD_LENGTH]);
 438         if (ret < 0) {
 439                 dev_err(&client->dev, "error reading payload: %d\n", ret);
 440                 goto unlock;
 441         }
 442
 443         dev_dbg(&client->dev, "read %d bytes for response command 0x%x\n",
 444                 buf[PAYLOAD_LENGTH], buf[PAYLOAD_BODY]);
 445
 446 unlock:
 447         mutex_unlock(&ts->access_mutex);
 448         return ret;
 449 }
 450
 451 static void zforce_complete(struct zforce_ts *ts, int cmd, int result)
 452 {
 453         struct i2c_client *client = ts->client;
 454
 455         if (ts->command_waiting == cmd) {
 456                 dev_dbg(&client->dev, "completing command 0x%x\n", cmd);
 457                 ts->command_result = result;
 458                 complete(&ts->command_done);
 459         } else {
 460                 dev_dbg(&client->dev, "command %d not for us\n", cmd);
 461         }
 462 }
 463
 464 static irqreturn_t zforce_irq(int irq, void *dev_id)
 465 {
 466         struct zforce_ts *ts = dev_id;
 467         struct i2c_client *client = ts->client;
 468
 469         if (ts->suspended && device_may_wakeup(&client->dev))
 470                 pm_wakeup_event(&client->dev, 500);
 471
 472         return IRQ_WAKE_THREAD;
 473 }
 474
 475 static irqreturn_t zforce_irq_thread(int irq, void *dev_id)
 476 {
 477         struct zforce_ts *ts = dev_id;
 478         struct i2c_client *client = ts->client;
 479         const struct zforce_ts_platdata *pdata = ts->pdata;
 480         int ret;
 481         u8 payload_buffer[FRAME_MAXSIZE];
 482         u8 *payload;
 483
 484         /*
 485          * When still suspended, return.
 486          * Due to the level-interrupt we will get re-triggered later.
 487          */
 488         if (ts->suspended) {
 489                 msleep(20);
 490                 return IRQ_HANDLED;
 491         }
 492
 493         dev_dbg(&client->dev, "handling interrupt\n");
 494
 495         /* Don't emit wakeup events from commands run by zforce_suspend */
 496         if (!ts->suspending && device_may_wakeup(&client->dev))
 497                 pm_stay_awake(&client->dev);
 498
 499         while (!gpio_get_value(pdata->gpio_int)) {
 500                 ret = zforce_read_packet(ts, payload_buffer);
 501                 if (ret < 0) {
 502                         dev_err(&client->dev,
 503                                 "could not read packet, ret: %d\n", ret);
 504                         break;
 505                 }
 506
 507                 payload =  &payload_buffer[PAYLOAD_BODY];
 508
 509                 switch (payload[RESPONSE_ID]) {
 510                 case NOTIFICATION_TOUCH:
 511                         /*
 512                          * Always report touch-events received while
 513                          * suspending, when being a wakeup source
 514                          */
 515                         if (ts->suspending && device_may_wakeup(&client->dev))
 516                                 pm_wakeup_event(&client->dev, 500);
 517                         zforce_touch_event(ts, &payload[RESPONSE_DATA]);
 518                         break;
 519
 520                 case NOTIFICATION_BOOTCOMPLETE:
 521                         ts->boot_complete = payload[RESPONSE_DATA];
 522                         zforce_complete(ts, payload[RESPONSE_ID], 0);
 523                         break;
 524
 525                 case RESPONSE_INITIALIZE:
 526                 case RESPONSE_DEACTIVATE:
 527                 case RESPONSE_SETCONFIG:
 528                 case RESPONSE_RESOLUTION:
 529                 case RESPONSE_SCANFREQ:
 530                         zforce_complete(ts, payload[RESPONSE_ID],
 531                                         payload[RESPONSE_DATA]);
 532                         break;
 533
 534                 case RESPONSE_STATUS:
 535                         /*
 536                          * Version Payload Results
 537                          * [2:major] [2:minor] [2:build] [2:rev]
 538                          */
 539                         ts->version_major = (payload[RESPONSE_DATA + 1] << 8) |
 540                                                 payload[RESPONSE_DATA];
 541                         ts->version_minor = (payload[RESPONSE_DATA + 3] << 8) |
 542                                                 payload[RESPONSE_DATA + 2];
 543                         ts->version_build = (payload[RESPONSE_DATA + 5] << 8) |
 544                                                 payload[RESPONSE_DATA + 4];
 545                         ts->version_rev   = (payload[RESPONSE_DATA + 7] << 8) |
 546                                                 payload[RESPONSE_DATA + 6];
 547                         dev_dbg(&ts->client->dev,
 548                                 "Firmware Version %04x:%04x %04x:%04x\n",
 549                                 ts->version_major, ts->version_minor,
 550                                 ts->version_build, ts->version_rev);
 551
 552                         zforce_complete(ts, payload[RESPONSE_ID], 0);
 553                         break;
 554
 555                 case NOTIFICATION_INVALID_COMMAND:
 556                         dev_err(&ts->client->dev, "invalid command: 0x%x\n",
 557                                 payload[RESPONSE_DATA]);
 558                         break;
 559
 560                 default:
 561                         dev_err(&ts->client->dev,
 562                                 "unrecognized response id: 0x%x\n",
 563                                 payload[RESPONSE_ID]);
 564                         break;
 565                 }
 566         }
 567
 568         if (!ts->suspending && device_may_wakeup(&client->dev))
 569                 pm_relax(&client->dev);
 570
 571         dev_dbg(&client->dev, "finished interrupt\n");
 572
 573         return IRQ_HANDLED;
 574 }
 575
 576 static int zforce_input_open(struct input_dev *dev)
 577 {
 578         struct zforce_ts *ts = input_get_drvdata(dev);
 579         int ret;
 580
 581         ret = zforce_start(ts);
 582         if (ret)
 583                 return ret;
 584
 585         return 0;
 586 }
 587
 588 static void zforce_input_close(struct input_dev *dev)
 589 {
 590         struct zforce_ts *ts = input_get_drvdata(dev);
 591         struct i2c_client *client = ts->client;
 592         int ret;
 593
 594         ret = zforce_stop(ts);
 595         if (ret)
 596                 dev_warn(&client->dev, "stopping zforce failed\n");
 597
 598         return;
 599 }
 600
 601 #ifdef CONFIG_PM_SLEEP
 602 static int zforce_suspend(struct device *dev)
 603 {
 604         struct i2c_client *client = to_i2c_client(dev);
 605         struct zforce_ts *ts = i2c_get_clientdata(client);
 606         struct input_dev *input = ts->input;
 607         int ret = 0;
 608
 609         mutex_lock(&input->mutex);
 610         ts->suspending = true;
 611
 612         /*
 613          * When configured as a wakeup source device should always wake
 614          * the system, therefore start device if necessary.
 615          */
 616         if (device_may_wakeup(&client->dev)) {
 617                 dev_dbg(&client->dev, "suspend while being a wakeup source\n");
 618
 619                 /* Need to start device, if not open, to be a wakeup source. */
 620                 if (!input->users) {
 621                         ret = zforce_start(ts);
 622                         if (ret)
 623                                 goto unlock;
 624                 }
 625
 626                 enable_irq_wake(client->irq);
 627         } else if (input->users) {
 628                 dev_dbg(&client->dev,
 629                         "suspend without being a wakeup source\n");
 630
 631                 ret = zforce_stop(ts);
 632                 if (ret)
 633                         goto unlock;
 634
 635                 disable_irq(client->irq);
 636         }
 637
 638         ts->suspended = true;
 639
 640 unlock:
 641         ts->suspending = false;
 642         mutex_unlock(&input->mutex);
 643
 644         return ret;
 645 }
 646
 647 static int zforce_resume(struct device *dev)
 648 {
 649         struct i2c_client *client = to_i2c_client(dev);
 650         struct zforce_ts *ts = i2c_get_clientdata(client);
 651         struct input_dev *input = ts->input;
 652         int ret = 0;
 653
 654         mutex_lock(&input->mutex);
 655
 656         ts->suspended = false;
 657
 658         if (device_may_wakeup(&client->dev)) {
 659                 dev_dbg(&client->dev, "resume from being a wakeup source\n");
 660
 661                 disable_irq_wake(client->irq);
 662
 663                 /* need to stop device if it was not open on suspend */
 664                 if (!input->users) {
 665                         ret = zforce_stop(ts);
 666                         if (ret)
 667                                 goto unlock;
 668                 }
 669         } else if (input->users) {
 670                 dev_dbg(&client->dev, "resume without being a wakeup source\n");
 671
 672                 enable_irq(client->irq);
 673
 674                 ret = zforce_start(ts);
 675                 if (ret < 0)
 676                         goto unlock;
 677         }
 678
 679 unlock:
 680         mutex_unlock(&input->mutex);
 681
 682         return ret;
 683 }
 684 #endif
 685
 686 static SIMPLE_DEV_PM_OPS(zforce_pm_ops, zforce_suspend, zforce_resume);
 687
 688 static void zforce_reset(void *data)
 689 {
 690         struct zforce_ts *ts = data;
 691
 692         gpio_set_value(ts->pdata->gpio_rst, 0);
 693 }
 694
 695 static struct zforce_ts_platdata *zforce_parse_dt(struct device *dev)
 696 {
 697         struct zforce_ts_platdata *pdata;
 698         struct device_node *np = dev->of_node;
 699
 700         if (!np)
 701                 return ERR_PTR(-ENOENT);
 702
 703         pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
 704         if (!pdata) {
 705                 dev_err(dev, "failed to allocate platform data\n");
 706                 return ERR_PTR(-ENOMEM);
 707         }
 708
 709         pdata->gpio_int = of_get_gpio(np, 0);
 710         if (!gpio_is_valid(pdata->gpio_int)) {
 711                 dev_err(dev, "failed to get interrupt gpio\n");
 712                 return ERR_PTR(-EINVAL);
 713         }
 714
 715         pdata->gpio_rst = of_get_gpio(np, 1);
 716         if (!gpio_is_valid(pdata->gpio_rst)) {
 717                 dev_err(dev, "failed to get reset gpio\n");
 718                 return ERR_PTR(-EINVAL);
 719         }
 720
 721         if (of_property_read_u32(np, "x-size", &pdata->x_max)) {
 722                 dev_err(dev, "failed to get x-size property\n");
 723                 return ERR_PTR(-EINVAL);
 724         }
 725
 726         if (of_property_read_u32(np, "y-size", &pdata->y_max)) {
 727                 dev_err(dev, "failed to get y-size property\n");
 728                 return ERR_PTR(-EINVAL);
 729         }
 730
 731         return pdata;
 732 }
 733
 734 static int zforce_probe(struct i2c_client *client,
 735                         const struct i2c_device_id *id)
 736 {
 737         const struct zforce_ts_platdata *pdata = dev_get_platdata(&client->dev);
 738         struct zforce_ts *ts;
 739         struct input_dev *input_dev;
 740         int ret;
 741
 742         if (!pdata) {
 743                 pdata = zforce_parse_dt(&client->dev);
 744                 if (IS_ERR(pdata))
 745                         return PTR_ERR(pdata);
 746         }
 747
 748         ts = devm_kzalloc(&client->dev, sizeof(struct zforce_ts), GFP_KERNEL);
 749         if (!ts)
 750                 return -ENOMEM;
 751
 752         ret = devm_gpio_request_one(&client->dev, pdata->gpio_int, GPIOF_IN,
 753                                     "zforce_ts_int");
 754         if (ret) {
 755                 dev_err(&client->dev, "request of gpio %d failed, %d\n",
 756                         pdata->gpio_int, ret);
 757                 return ret;
 758         }
 759
 760         ret = devm_gpio_request_one(&client->dev, pdata->gpio_rst,
 761                                     GPIOF_OUT_INIT_LOW, "zforce_ts_rst");
 762         if (ret) {
 763                 dev_err(&client->dev, "request of gpio %d failed, %d\n",
 764                         pdata->gpio_rst, ret);
 765                 return ret;
 766         }
 767
 768         ret = devm_add_action(&client->dev, zforce_reset, ts);
 769         if (ret) {
 770                 dev_err(&client->dev, "failed to register reset action, %d\n",
 771                         ret);
 772                 return ret;
 773         }
 774
 775         snprintf(ts->phys, sizeof(ts->phys),
 776                  "%s/input0", dev_name(&client->dev));
 777
 778         input_dev = devm_input_allocate_device(&client->dev);
 779         if (!input_dev) {
 780                 dev_err(&client->dev, "could not allocate input device\n");
 781                 return -ENOMEM;
 782         }
 783
 784         mutex_init(&ts->access_mutex);
 785         mutex_init(&ts->command_mutex);
 786
 787         ts->pdata = pdata;
 788         ts->client = client;
 789         ts->input = input_dev;
 790
 791         input_dev->name = "Neonode zForce touchscreen";
 792         input_dev->phys = ts->phys;
 793         input_dev->id.bustype = BUS_I2C;
 794
 795         input_dev->open = zforce_input_open;
 796         input_dev->close = zforce_input_close;
 797
 798         __set_bit(EV_KEY, input_dev->evbit);
 799         __set_bit(EV_SYN, input_dev->evbit);
 800         __set_bit(EV_ABS, input_dev->evbit);
 801
 802         /* For multi touch */
 803         input_set_abs_params(input_dev, ABS_MT_POSITION_X, 0,
 804                              pdata->x_max, 0, 0);
 805         input_set_abs_params(input_dev, ABS_MT_POSITION_Y, 0,
 806                              pdata->y_max, 0, 0);
 807
 808         input_set_abs_params(input_dev, ABS_MT_TOUCH_MAJOR, 0,
 809                              ZFORCE_MAX_AREA, 0, 0);
 810         input_set_abs_params(input_dev, ABS_MT_TOUCH_MINOR, 0,
 811                              ZFORCE_MAX_AREA, 0, 0);
 812         input_set_abs_params(input_dev, ABS_MT_ORIENTATION, 0, 1, 0, 0);
 813         input_mt_init_slots(input_dev, ZFORCE_REPORT_POINTS, INPUT_MT_DIRECT);
 814
 815         input_set_drvdata(ts->input, ts);
 816
 817         init_completion(&ts->command_done);
 818
 819         /*
 820          * The zforce pulls the interrupt low when it has data ready.
 821          * After it is triggered the isr thread runs until all the available
 822          * packets have been read and the interrupt is high again.
 823          * Therefore we can trigger the interrupt anytime it is low and do
 824          * not need to limit it to the interrupt edge.
 825          */
 826         ret = devm_request_threaded_irq(&client->dev, client->irq,
 827                                         zforce_irq, zforce_irq_thread,
 828                                         IRQF_TRIGGER_LOW | IRQF_ONESHOT,
 829                                         input_dev->name, ts);
 830         if (ret) {
 831                 dev_err(&client->dev, "irq %d request failed\n", client->irq);
 832                 return ret;
 833         }
 834
 835         i2c_set_clientdata(client, ts);
 836
 837         /* let the controller boot */
 838         gpio_set_value(pdata->gpio_rst, 1);
 839
 840         ts->command_waiting = NOTIFICATION_BOOTCOMPLETE;
 841         if (wait_for_completion_timeout(&ts->command_done, WAIT_TIMEOUT) == 0)
 842                 dev_warn(&client->dev, "bootcomplete timed out\n");
 843
 844         /* need to start device to get version information */
 845         ret = zforce_command_wait(ts, COMMAND_INITIALIZE);
 846         if (ret) {
 847                 dev_err(&client->dev, "unable to initialize, %d\n", ret);
 848                 return ret;
 849         }
 850
 851         /* this gets the firmware version among other information */
 852         ret = zforce_command_wait(ts, COMMAND_STATUS);
 853         if (ret < 0) {
 854                 dev_err(&client->dev, "couldn't get status, %d\n", ret);
 855                 zforce_stop(ts);
 856                 return ret;
 857         }
 858
 859         /* stop device and put it into sleep until it is opened */
 860         ret = zforce_stop(ts);
 861         if (ret < 0)
 862                 return ret;
 863
 864         device_set_wakeup_capable(&client->dev, true);
 865
 866         ret = input_register_device(input_dev);
 867         if (ret) {
 868                 dev_err(&client->dev, "could not register input device, %d\n",
 869                         ret);
 870                 return ret;
 871         }
 872
 873         return 0;
 874 }
 875
 876 static struct i2c_device_id zforce_idtable[] = {
 877         { "zforce-ts", 0 },
 878         { }
 879 };
 880 MODULE_DEVICE_TABLE(i2c, zforce_idtable);
 881
 882 #ifdef CONFIG_OF
 883 static struct of_device_id zforce_dt_idtable[] = {
 884         { .compatible = "neonode,zforce" },
 885         {},
 886 };
 887 MODULE_DEVICE_TABLE(of, zforce_dt_idtable);
 888 #endif
 889
 890 static struct i2c_driver zforce_driver = {
 891         .driver = {
 892                 .owner  = THIS_MODULE,
 893                 .name   = "zforce-ts",
 894                 .pm     = &zforce_pm_ops,
 895                 .of_match_table = of_match_ptr(zforce_dt_idtable),
 896         },
 897         .probe          = zforce_probe,
 898         .id_table       = zforce_idtable,
 899 };
 900
 901 module_i2c_driver(zforce_driver);
 902
 903 MODULE_AUTHOR("Heiko Stuebner <heiko@sntech.de>");
 904 MODULE_DESCRIPTION("zForce TouchScreen Driver");
 905 MODULE_LICENSE("GPL");