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