drivers/input/touchscreen/auo-pixcir-ts.c

   1 /*
   2  * Driver for AUO in-cell touchscreens
   3  *
   4  * Copyright (c) 2011 Heiko Stuebner <heiko@sntech.de>
   5  *
   6  * loosely based on auo_touch.c from Dell Streak vendor-kernel
   7  *
   8  * Copyright (c) 2008 QUALCOMM Incorporated.
   9  * Copyright (c) 2008 QUALCOMM USA, INC.
  10  *
  11  *
  12  * This software is licensed under the terms of the GNU General Public
  13  * License version 2, as published by the Free Software Foundation, and
  14  * may be copied, distributed, and modified under those terms.
  15  *
  16  * This program is distributed in the hope that it will be useful,
  17  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  18  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19  * GNU General Public License for more details.
  20  *
  21  */
  22
  23 #include <linux/kernel.h>
  24 #include <linux/module.h>
  25 #include <linux/interrupt.h>
  26 #include <linux/slab.h>
  27 #include <linux/input.h>
  28 #include <linux/jiffies.h>
  29 #include <linux/i2c.h>
  30 #include <linux/mutex.h>
  31 #include <linux/delay.h>
  32 #include <linux/gpio.h>
  33 #include <linux/input/auo-pixcir-ts.h>
  34 #include <linux/of.h>
  35 #include <linux/of_gpio.h>
  36
  37 /*
  38  * Coordinate calculation:
  39  * X1 = X1_LSB + X1_MSB*256
  40  * Y1 = Y1_LSB + Y1_MSB*256
  41  * X2 = X2_LSB + X2_MSB*256
  42  * Y2 = Y2_LSB + Y2_MSB*256
  43  */
  44 #define AUO_PIXCIR_REG_X1_LSB           0x00
  45 #define AUO_PIXCIR_REG_X1_MSB           0x01
  46 #define AUO_PIXCIR_REG_Y1_LSB           0x02
  47 #define AUO_PIXCIR_REG_Y1_MSB           0x03
  48 #define AUO_PIXCIR_REG_X2_LSB           0x04
  49 #define AUO_PIXCIR_REG_X2_MSB           0x05
  50 #define AUO_PIXCIR_REG_Y2_LSB           0x06
  51 #define AUO_PIXCIR_REG_Y2_MSB           0x07
  52
  53 #define AUO_PIXCIR_REG_STRENGTH         0x0d
  54 #define AUO_PIXCIR_REG_STRENGTH_X1_LSB  0x0e
  55 #define AUO_PIXCIR_REG_STRENGTH_X1_MSB  0x0f
  56
  57 #define AUO_PIXCIR_REG_RAW_DATA_X       0x2b
  58 #define AUO_PIXCIR_REG_RAW_DATA_Y       0x4f
  59
  60 #define AUO_PIXCIR_REG_X_SENSITIVITY    0x6f
  61 #define AUO_PIXCIR_REG_Y_SENSITIVITY    0x70
  62 #define AUO_PIXCIR_REG_INT_SETTING      0x71
  63 #define AUO_PIXCIR_REG_INT_WIDTH        0x72
  64 #define AUO_PIXCIR_REG_POWER_MODE       0x73
  65
  66 #define AUO_PIXCIR_REG_VERSION          0x77
  67 #define AUO_PIXCIR_REG_CALIBRATE        0x78
  68
  69 #define AUO_PIXCIR_REG_TOUCHAREA_X1     0x1e
  70 #define AUO_PIXCIR_REG_TOUCHAREA_Y1     0x1f
  71 #define AUO_PIXCIR_REG_TOUCHAREA_X2     0x20
  72 #define AUO_PIXCIR_REG_TOUCHAREA_Y2     0x21
  73
  74 #define AUO_PIXCIR_REG_EEPROM_CALIB_X   0x42
  75 #define AUO_PIXCIR_REG_EEPROM_CALIB_Y   0xad
  76
  77 #define AUO_PIXCIR_INT_TPNUM_MASK       0xe0
  78 #define AUO_PIXCIR_INT_TPNUM_SHIFT      5
  79 #define AUO_PIXCIR_INT_RELEASE          (1 << 4)
  80 #define AUO_PIXCIR_INT_ENABLE           (1 << 3)
  81 #define AUO_PIXCIR_INT_POL_HIGH         (1 << 2)
  82 #define AUO_PIXCIR_INT_MODE_MASK        0x03
  83
  84 /*
  85  * Power modes:
  86  * active:      scan speed 60Hz
  87  * sleep:       scan speed 10Hz can be auto-activated, wakeup on 1st touch
  88  * deep sleep:  scan speed 1Hz can only be entered or left manually.
  89  */
  90 #define AUO_PIXCIR_POWER_ACTIVE         0x00
  91 #define AUO_PIXCIR_POWER_SLEEP          0x01
  92 #define AUO_PIXCIR_POWER_DEEP_SLEEP     0x02
  93 #define AUO_PIXCIR_POWER_MASK           0x03
  94
  95 #define AUO_PIXCIR_POWER_ALLOW_SLEEP    (1 << 2)
  96 #define AUO_PIXCIR_POWER_IDLE_TIME(ms)  ((ms & 0xf) << 4)
  97
  98 #define AUO_PIXCIR_CALIBRATE            0x03
  99
 100 #define AUO_PIXCIR_EEPROM_CALIB_X_LEN   62
 101 #define AUO_PIXCIR_EEPROM_CALIB_Y_LEN   36
 102
 103 #define AUO_PIXCIR_RAW_DATA_X_LEN       18
 104 #define AUO_PIXCIR_RAW_DATA_Y_LEN       11
 105
 106 #define AUO_PIXCIR_STRENGTH_ENABLE      (1 << 0)
 107
 108 /* Touchscreen absolute values */
 109 #define AUO_PIXCIR_REPORT_POINTS        2
 110 #define AUO_PIXCIR_MAX_AREA             0xff
 111 #define AUO_PIXCIR_PENUP_TIMEOUT_MS     10
 112
 113 struct auo_pixcir_ts {
 114         struct i2c_client       *client;
 115         struct input_dev        *input;
 116         const struct auo_pixcir_ts_platdata *pdata;
 117         char                    phys[32];
 118
 119         /* special handling for touch_indicate interupt mode */
 120         bool                    touch_ind_mode;
 121
 122         wait_queue_head_t       wait;
 123         bool                    stopped;
 124 };
 125
 126 struct auo_point_t {
 127         int     coord_x;
 128         int     coord_y;
 129         int     area_major;
 130         int     area_minor;
 131         int     orientation;
 132 };
 133
 134 static int auo_pixcir_collect_data(struct auo_pixcir_ts *ts,
 135                                    struct auo_point_t *point)
 136 {
 137         struct i2c_client *client = ts->client;
 138         const struct auo_pixcir_ts_platdata *pdata = ts->pdata;
 139         uint8_t raw_coord[8];
 140         uint8_t raw_area[4];
 141         int i, ret;
 142
 143         /* touch coordinates */
 144         ret = i2c_smbus_read_i2c_block_data(client, AUO_PIXCIR_REG_X1_LSB,
 145                                             8, raw_coord);
 146         if (ret < 0) {
 147                 dev_err(&client->dev, "failed to read coordinate, %d\n", ret);
 148                 return ret;
 149         }
 150
 151         /* touch area */
 152         ret = i2c_smbus_read_i2c_block_data(client, AUO_PIXCIR_REG_TOUCHAREA_X1,
 153                                             4, raw_area);
 154         if (ret < 0) {
 155                 dev_err(&client->dev, "could not read touch area, %d\n", ret);
 156                 return ret;
 157         }
 158
 159         for (i = 0; i < AUO_PIXCIR_REPORT_POINTS; i++) {
 160                 point[i].coord_x =
 161                         raw_coord[4 * i + 1] << 8 | raw_coord[4 * i];
 162                 point[i].coord_y =
 163                         raw_coord[4 * i + 3] << 8 | raw_coord[4 * i + 2];
 164
 165                 if (point[i].coord_x > pdata->x_max ||
 166                     point[i].coord_y > pdata->y_max) {
 167                         dev_warn(&client->dev, "coordinates (%d,%d) invalid\n",
 168                                 point[i].coord_x, point[i].coord_y);
 169                         point[i].coord_x = point[i].coord_y = 0;
 170                 }
 171
 172                 /* determine touch major, minor and orientation */
 173                 point[i].area_major = max(raw_area[2 * i], raw_area[2 * i + 1]);
 174                 point[i].area_minor = min(raw_area[2 * i], raw_area[2 * i + 1]);
 175                 point[i].orientation = raw_area[2 * i] > raw_area[2 * i + 1];
 176         }
 177
 178         return 0;
 179 }
 180
 181 static irqreturn_t auo_pixcir_interrupt(int irq, void *dev_id)
 182 {
 183         struct auo_pixcir_ts *ts = dev_id;
 184         const struct auo_pixcir_ts_platdata *pdata = ts->pdata;
 185         struct auo_point_t point[AUO_PIXCIR_REPORT_POINTS];
 186         int i;
 187         int ret;
 188         int fingers = 0;
 189         int abs = -1;
 190
 191         while (!ts->stopped) {
 192
 193                 /* check for up event in touch touch_ind_mode */
 194                 if (ts->touch_ind_mode) {
 195                         if (gpio_get_value(pdata->gpio_int) == 0) {
 196                                 input_mt_sync(ts->input);
 197                                 input_report_key(ts->input, BTN_TOUCH, 0);
 198                                 input_sync(ts->input);
 199                                 break;
 200                         }
 201                 }
 202
 203                 ret = auo_pixcir_collect_data(ts, point);
 204                 if (ret < 0) {
 205                         /* we want to loop only in touch_ind_mode */
 206                         if (!ts->touch_ind_mode)
 207                                 break;
 208
 209                         wait_event_timeout(ts->wait, ts->stopped,
 210                                 msecs_to_jiffies(AUO_PIXCIR_PENUP_TIMEOUT_MS));
 211                         continue;
 212                 }
 213
 214                 for (i = 0; i < AUO_PIXCIR_REPORT_POINTS; i++) {
 215                         if (point[i].coord_x > 0 || point[i].coord_y > 0) {
 216                                 input_report_abs(ts->input, ABS_MT_POSITION_X,
 217                                                  point[i].coord_x);
 218                                 input_report_abs(ts->input, ABS_MT_POSITION_Y,
 219                                                  point[i].coord_y);
 220                                 input_report_abs(ts->input, ABS_MT_TOUCH_MAJOR,
 221                                                  point[i].area_major);
 222                                 input_report_abs(ts->input, ABS_MT_TOUCH_MINOR,
 223                                                  point[i].area_minor);
 224                                 input_report_abs(ts->input, ABS_MT_ORIENTATION,
 225                                                  point[i].orientation);
 226                                 input_mt_sync(ts->input);
 227
 228                                 /* use first finger as source for singletouch */
 229                                 if (fingers == 0)
 230                                         abs = i;
 231
 232                                 /* number of touch points could also be queried
 233                                  * via i2c but would require an additional call
 234                                  */
 235                                 fingers++;
 236                         }
 237                 }
 238
 239                 input_report_key(ts->input, BTN_TOUCH, fingers > 0);
 240
 241                 if (abs > -1) {
 242                         input_report_abs(ts->input, ABS_X, point[abs].coord_x);
 243                         input_report_abs(ts->input, ABS_Y, point[abs].coord_y);
 244                 }
 245
 246                 input_sync(ts->input);
 247
 248                 /* we want to loop only in touch_ind_mode */
 249                 if (!ts->touch_ind_mode)
 250                         break;
 251
 252                 wait_event_timeout(ts->wait, ts->stopped,
 253                                  msecs_to_jiffies(AUO_PIXCIR_PENUP_TIMEOUT_MS));
 254         }
 255
 256         return IRQ_HANDLED;
 257 }
 258
 259 /*
 260  * Set the power mode of the device.
 261  * Valid modes are
 262  * - AUO_PIXCIR_POWER_ACTIVE
 263  * - AUO_PIXCIR_POWER_SLEEP - automatically left on first touch
 264  * - AUO_PIXCIR_POWER_DEEP_SLEEP
 265  */
 266 static int auo_pixcir_power_mode(struct auo_pixcir_ts *ts, int mode)
 267 {
 268         struct i2c_client *client = ts->client;
 269         int ret;
 270
 271         ret = i2c_smbus_read_byte_data(client, AUO_PIXCIR_REG_POWER_MODE);
 272         if (ret < 0) {
 273                 dev_err(&client->dev, "unable to read reg %Xh, %d\n",
 274                         AUO_PIXCIR_REG_POWER_MODE, ret);
 275                 return ret;
 276         }
 277
 278         ret &= ~AUO_PIXCIR_POWER_MASK;
 279         ret |= mode;
 280
 281         ret = i2c_smbus_write_byte_data(client, AUO_PIXCIR_REG_POWER_MODE, ret);
 282         if (ret) {
 283                 dev_err(&client->dev, "unable to write reg %Xh, %d\n",
 284                         AUO_PIXCIR_REG_POWER_MODE, ret);
 285                 return ret;
 286         }
 287
 288         return 0;
 289 }
 290
 291 static int auo_pixcir_int_config(struct auo_pixcir_ts *ts,
 292                                            int int_setting)
 293 {
 294         struct i2c_client *client = ts->client;
 295         const struct auo_pixcir_ts_platdata *pdata = ts->pdata;
 296         int ret;
 297
 298         ret = i2c_smbus_read_byte_data(client, AUO_PIXCIR_REG_INT_SETTING);
 299         if (ret < 0) {
 300                 dev_err(&client->dev, "unable to read reg %Xh, %d\n",
 301                         AUO_PIXCIR_REG_INT_SETTING, ret);
 302                 return ret;
 303         }
 304
 305         ret &= ~AUO_PIXCIR_INT_MODE_MASK;
 306         ret |= int_setting;
 307         ret |= AUO_PIXCIR_INT_POL_HIGH; /* always use high for interrupts */
 308
 309         ret = i2c_smbus_write_byte_data(client, AUO_PIXCIR_REG_INT_SETTING,
 310                                         ret);
 311         if (ret < 0) {
 312                 dev_err(&client->dev, "unable to write reg %Xh, %d\n",
 313                         AUO_PIXCIR_REG_INT_SETTING, ret);
 314                 return ret;
 315         }
 316
 317         ts->touch_ind_mode = pdata->int_setting == AUO_PIXCIR_INT_TOUCH_IND;
 318
 319         return 0;
 320 }
 321
 322 /* control the generation of interrupts on the device side */
 323 static int auo_pixcir_int_toggle(struct auo_pixcir_ts *ts, bool enable)
 324 {
 325         struct i2c_client *client = ts->client;
 326         int ret;
 327
 328         ret = i2c_smbus_read_byte_data(client, AUO_PIXCIR_REG_INT_SETTING);
 329         if (ret < 0) {
 330                 dev_err(&client->dev, "unable to read reg %Xh, %d\n",
 331                         AUO_PIXCIR_REG_INT_SETTING, ret);
 332                 return ret;
 333         }
 334
 335         if (enable)
 336                 ret |= AUO_PIXCIR_INT_ENABLE;
 337         else
 338                 ret &= ~AUO_PIXCIR_INT_ENABLE;
 339
 340         ret = i2c_smbus_write_byte_data(client, AUO_PIXCIR_REG_INT_SETTING,
 341                                         ret);
 342         if (ret < 0) {
 343                 dev_err(&client->dev, "unable to write reg %Xh, %d\n",
 344                         AUO_PIXCIR_REG_INT_SETTING, ret);
 345                 return ret;
 346         }
 347
 348         return 0;
 349 }
 350
 351 static int auo_pixcir_start(struct auo_pixcir_ts *ts)
 352 {
 353         struct i2c_client *client = ts->client;
 354         int ret;
 355
 356         ret = auo_pixcir_power_mode(ts, AUO_PIXCIR_POWER_ACTIVE);
 357         if (ret < 0) {
 358                 dev_err(&client->dev, "could not set power mode, %d\n",
 359                         ret);
 360                 return ret;
 361         }
 362
 363         ts->stopped = false;
 364         mb();
 365         enable_irq(client->irq);
 366
 367         ret = auo_pixcir_int_toggle(ts, 1);
 368         if (ret < 0) {
 369                 dev_err(&client->dev, "could not enable interrupt, %d\n",
 370                         ret);
 371                 disable_irq(client->irq);
 372                 return ret;
 373         }
 374
 375         return 0;
 376 }
 377
 378 static int auo_pixcir_stop(struct auo_pixcir_ts *ts)
 379 {
 380         struct i2c_client *client = ts->client;
 381         int ret;
 382
 383         ret = auo_pixcir_int_toggle(ts, 0);
 384         if (ret < 0) {
 385                 dev_err(&client->dev, "could not disable interrupt, %d\n",
 386                         ret);
 387                 return ret;
 388         }
 389
 390         /* disable receiving of interrupts */
 391         disable_irq(client->irq);
 392         ts->stopped = true;
 393         mb();
 394         wake_up(&ts->wait);
 395
 396         return auo_pixcir_power_mode(ts, AUO_PIXCIR_POWER_DEEP_SLEEP);
 397 }
 398
 399 static int auo_pixcir_input_open(struct input_dev *dev)
 400 {
 401         struct auo_pixcir_ts *ts = input_get_drvdata(dev);
 402
 403         return auo_pixcir_start(ts);
 404 }
 405
 406 static void auo_pixcir_input_close(struct input_dev *dev)
 407 {
 408         struct auo_pixcir_ts *ts = input_get_drvdata(dev);
 409
 410         auo_pixcir_stop(ts);
 411 }
 412
 413 static int __maybe_unused auo_pixcir_suspend(struct device *dev)
 414 {
 415         struct i2c_client *client = to_i2c_client(dev);
 416         struct auo_pixcir_ts *ts = i2c_get_clientdata(client);
 417         struct input_dev *input = ts->input;
 418         int ret = 0;
 419
 420         mutex_lock(&input->mutex);
 421
 422         /* when configured as wakeup source, device should always wake system
 423          * therefore start device if necessary
 424          */
 425         if (device_may_wakeup(&client->dev)) {
 426                 /* need to start device if not open, to be wakeup source */
 427                 if (!input->users) {
 428                         ret = auo_pixcir_start(ts);
 429                         if (ret)
 430                                 goto unlock;
 431                 }
 432
 433                 enable_irq_wake(client->irq);
 434                 ret = auo_pixcir_power_mode(ts, AUO_PIXCIR_POWER_SLEEP);
 435         } else if (input->users) {
 436                 ret = auo_pixcir_stop(ts);
 437         }
 438
 439 unlock:
 440         mutex_unlock(&input->mutex);
 441
 442         return ret;
 443 }
 444
 445 static int __maybe_unused auo_pixcir_resume(struct device *dev)
 446 {
 447         struct i2c_client *client = to_i2c_client(dev);
 448         struct auo_pixcir_ts *ts = i2c_get_clientdata(client);
 449         struct input_dev *input = ts->input;
 450         int ret = 0;
 451
 452         mutex_lock(&input->mutex);
 453
 454         if (device_may_wakeup(&client->dev)) {
 455                 disable_irq_wake(client->irq);
 456
 457                 /* need to stop device if it was not open on suspend */
 458                 if (!input->users) {
 459                         ret = auo_pixcir_stop(ts);
 460                         if (ret)
 461                                 goto unlock;
 462                 }
 463
 464                 /* device wakes automatically from SLEEP */
 465         } else if (input->users) {
 466                 ret = auo_pixcir_start(ts);
 467         }
 468
 469 unlock:
 470         mutex_unlock(&input->mutex);
 471
 472         return ret;
 473 }
 474
 475 static SIMPLE_DEV_PM_OPS(auo_pixcir_pm_ops,
 476                          auo_pixcir_suspend, auo_pixcir_resume);
 477
 478 #ifdef CONFIG_OF
 479 static struct auo_pixcir_ts_platdata *auo_pixcir_parse_dt(struct device *dev)
 480 {
 481         struct auo_pixcir_ts_platdata *pdata;
 482         struct device_node *np = dev->of_node;
 483
 484         if (!np)
 485                 return ERR_PTR(-ENOENT);
 486
 487         pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
 488         if (!pdata)
 489                 return ERR_PTR(-ENOMEM);
 490
 491         pdata->gpio_int = of_get_gpio(np, 0);
 492         if (!gpio_is_valid(pdata->gpio_int)) {
 493                 dev_err(dev, "failed to get interrupt gpio\n");
 494                 return ERR_PTR(-EINVAL);
 495         }
 496
 497         pdata->gpio_rst = of_get_gpio(np, 1);
 498         if (!gpio_is_valid(pdata->gpio_rst)) {
 499                 dev_err(dev, "failed to get reset gpio\n");
 500                 return ERR_PTR(-EINVAL);
 501         }
 502
 503         if (of_property_read_u32(np, "x-size", &pdata->x_max)) {
 504                 dev_err(dev, "failed to get x-size property\n");
 505                 return ERR_PTR(-EINVAL);
 506         }
 507
 508         if (of_property_read_u32(np, "y-size", &pdata->y_max)) {
 509                 dev_err(dev, "failed to get y-size property\n");
 510                 return ERR_PTR(-EINVAL);
 511         }
 512
 513         /* default to asserting the interrupt when the screen is touched */
 514         pdata->int_setting = AUO_PIXCIR_INT_TOUCH_IND;
 515
 516         return pdata;
 517 }
 518 #else
 519 static struct auo_pixcir_ts_platdata *auo_pixcir_parse_dt(struct device *dev)
 520 {
 521         return ERR_PTR(-EINVAL);
 522 }
 523 #endif
 524
 525 static void auo_pixcir_reset(void *data)
 526 {
 527         struct auo_pixcir_ts *ts = data;
 528
 529         gpio_set_value(ts->pdata->gpio_rst, 0);
 530 }
 531
 532 static int auo_pixcir_probe(struct i2c_client *client,
 533                             const struct i2c_device_id *id)
 534 {
 535         const struct auo_pixcir_ts_platdata *pdata;
 536         struct auo_pixcir_ts *ts;
 537         struct input_dev *input_dev;
 538         int version;
 539         int error;
 540
 541         pdata = dev_get_platdata(&client->dev);
 542         if (!pdata) {
 543                 pdata = auo_pixcir_parse_dt(&client->dev);
 544                 if (IS_ERR(pdata))
 545                         return PTR_ERR(pdata);
 546         }
 547
 548         ts = devm_kzalloc(&client->dev,
 549                           sizeof(struct auo_pixcir_ts), GFP_KERNEL);
 550         if (!ts)
 551                 return -ENOMEM;
 552
 553         input_dev = devm_input_allocate_device(&client->dev);
 554         if (!input_dev) {
 555                 dev_err(&client->dev, "could not allocate input device\n");
 556                 return -ENOMEM;
 557         }
 558
 559         ts->pdata = pdata;
 560         ts->client = client;
 561         ts->input = input_dev;
 562         ts->touch_ind_mode = 0;
 563         ts->stopped = true;
 564         init_waitqueue_head(&ts->wait);
 565
 566         snprintf(ts->phys, sizeof(ts->phys),
 567                  "%s/input0", dev_name(&client->dev));
 568
 569         input_dev->name = "AUO-Pixcir touchscreen";
 570         input_dev->phys = ts->phys;
 571         input_dev->id.bustype = BUS_I2C;
 572
 573         input_dev->open = auo_pixcir_input_open;
 574         input_dev->close = auo_pixcir_input_close;
 575
 576         __set_bit(EV_ABS, input_dev->evbit);
 577         __set_bit(EV_KEY, input_dev->evbit);
 578
 579         __set_bit(BTN_TOUCH, input_dev->keybit);
 580
 581         /* For single touch */
 582         input_set_abs_params(input_dev, ABS_X, 0, pdata->x_max, 0, 0);
 583         input_set_abs_params(input_dev, ABS_Y, 0, pdata->y_max, 0, 0);
 584
 585         /* For multi touch */
 586         input_set_abs_params(input_dev, ABS_MT_POSITION_X, 0,
 587                              pdata->x_max, 0, 0);
 588         input_set_abs_params(input_dev, ABS_MT_POSITION_Y, 0,
 589                              pdata->y_max, 0, 0);
 590         input_set_abs_params(input_dev, ABS_MT_TOUCH_MAJOR, 0,
 591                              AUO_PIXCIR_MAX_AREA, 0, 0);
 592         input_set_abs_params(input_dev, ABS_MT_TOUCH_MINOR, 0,
 593                              AUO_PIXCIR_MAX_AREA, 0, 0);
 594         input_set_abs_params(input_dev, ABS_MT_ORIENTATION, 0, 1, 0, 0);
 595
 596         input_set_drvdata(ts->input, ts);
 597
 598         error = devm_gpio_request_one(&client->dev, pdata->gpio_int,
 599                                       GPIOF_DIR_IN, "auo_pixcir_ts_int");
 600         if (error) {
 601                 dev_err(&client->dev, "request of gpio %d failed, %d\n",
 602                         pdata->gpio_int, error);
 603                 return error;
 604         }
 605
 606         error = devm_gpio_request_one(&client->dev, pdata->gpio_rst,
 607                                       GPIOF_DIR_OUT | GPIOF_INIT_HIGH,
 608                                       "auo_pixcir_ts_rst");
 609         if (error) {
 610                 dev_err(&client->dev, "request of gpio %d failed, %d\n",
 611                         pdata->gpio_rst, error);
 612                 return error;
 613         }
 614
 615         error = devm_add_action(&client->dev, auo_pixcir_reset, ts);
 616         if (error) {
 617                 auo_pixcir_reset(ts);
 618                 dev_err(&client->dev, "failed to register reset action, %d\n",
 619                         error);
 620                 return error;
 621         }
 622
 623         msleep(200);
 624
 625         version = i2c_smbus_read_byte_data(client, AUO_PIXCIR_REG_VERSION);
 626         if (version < 0) {
 627                 error = version;
 628                 return error;
 629         }
 630
 631         dev_info(&client->dev, "firmware version 0x%X\n", version);
 632
 633         error = auo_pixcir_int_config(ts, pdata->int_setting);
 634         if (error)
 635                 return error;
 636
 637         error = devm_request_threaded_irq(&client->dev, client->irq,
 638                                           NULL, auo_pixcir_interrupt,
 639                                           IRQF_TRIGGER_RISING | IRQF_ONESHOT,
 640                                           input_dev->name, ts);
 641         if (error) {
 642                 dev_err(&client->dev, "irq %d requested failed, %d\n",
 643                         client->irq, error);
 644                 return error;
 645         }
 646
 647         /* stop device and put it into deep sleep until it is opened */
 648         error = auo_pixcir_stop(ts);
 649         if (error)
 650                 return error;
 651
 652         error = input_register_device(input_dev);
 653         if (error) {
 654                 dev_err(&client->dev, "could not register input device, %d\n",
 655                         error);
 656                 return error;
 657         }
 658
 659         i2c_set_clientdata(client, ts);
 660
 661         return 0;
 662 }
 663
 664 static const struct i2c_device_id auo_pixcir_idtable[] = {
 665         { "auo_pixcir_ts", 0 },
 666         { }
 667 };
 668 MODULE_DEVICE_TABLE(i2c, auo_pixcir_idtable);
 669
 670 #ifdef CONFIG_OF
 671 static const struct of_device_id auo_pixcir_ts_dt_idtable[] = {
 672         { .compatible = "auo,auo_pixcir_ts" },
 673         {},
 674 };
 675 MODULE_DEVICE_TABLE(of, auo_pixcir_ts_dt_idtable);
 676 #endif
 677
 678 static struct i2c_driver auo_pixcir_driver = {
 679         .driver = {
 680                 .name   = "auo_pixcir_ts",
 681                 .pm     = &auo_pixcir_pm_ops,
 682                 .of_match_table = of_match_ptr(auo_pixcir_ts_dt_idtable),
 683         },
 684         .probe          = auo_pixcir_probe,
 685         .id_table       = auo_pixcir_idtable,
 686 };
 687
 688 module_i2c_driver(auo_pixcir_driver);
 689
 690 MODULE_DESCRIPTION("AUO-PIXCIR touchscreen driver");
 691 MODULE_LICENSE("GPL v2");
 692 MODULE_AUTHOR("Heiko Stuebner <heiko@sntech.de>");