drivers/input/touchscreen/stmfts.c

   1 /*
   2  * Copyright (c) 2017 Samsung Electronics Co., Ltd.
   3  * Author: Andi Shyti <andi.shyti@samsung.com>
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License version 2 as
   7  * published by the Free Software Foundation.
   8  *
   9  * STMicroelectronics FTS Touchscreen device driver
  10  */
  11
  12 #include <linux/delay.h>
  13 #include <linux/i2c.h>
  14 #include <linux/input/mt.h>
  15 #include <linux/input/touchscreen.h>
  16 #include <linux/interrupt.h>
  17 #include <linux/irq.h>
  18 #include <linux/leds.h>
  19 #include <linux/module.h>
  20 #include <linux/pm_runtime.h>
  21 #include <linux/regulator/consumer.h>
  22
  23 /* I2C commands */
  24 #define STMFTS_READ_INFO                        0x80
  25 #define STMFTS_READ_STATUS                      0x84
  26 #define STMFTS_READ_ONE_EVENT                   0x85
  27 #define STMFTS_READ_ALL_EVENT                   0x86
  28 #define STMFTS_LATEST_EVENT                     0x87
  29 #define STMFTS_SLEEP_IN                         0x90
  30 #define STMFTS_SLEEP_OUT                        0x91
  31 #define STMFTS_MS_MT_SENSE_OFF                  0x92
  32 #define STMFTS_MS_MT_SENSE_ON                   0x93
  33 #define STMFTS_SS_HOVER_SENSE_OFF               0x94
  34 #define STMFTS_SS_HOVER_SENSE_ON                0x95
  35 #define STMFTS_MS_KEY_SENSE_OFF                 0x9a
  36 #define STMFTS_MS_KEY_SENSE_ON                  0x9b
  37 #define STMFTS_SYSTEM_RESET                     0xa0
  38 #define STMFTS_CLEAR_EVENT_STACK                0xa1
  39 #define STMFTS_FULL_FORCE_CALIBRATION           0xa2
  40 #define STMFTS_MS_CX_TUNING                     0xa3
  41 #define STMFTS_SS_CX_TUNING                     0xa4
  42
  43 /* events */
  44 #define STMFTS_EV_NO_EVENT                      0x00
  45 #define STMFTS_EV_MULTI_TOUCH_DETECTED          0x02
  46 #define STMFTS_EV_MULTI_TOUCH_ENTER             0x03
  47 #define STMFTS_EV_MULTI_TOUCH_LEAVE             0x04
  48 #define STMFTS_EV_MULTI_TOUCH_MOTION            0x05
  49 #define STMFTS_EV_HOVER_ENTER                   0x07
  50 #define STMFTS_EV_HOVER_LEAVE                   0x08
  51 #define STMFTS_EV_HOVER_MOTION                  0x09
  52 #define STMFTS_EV_KEY_STATUS                    0x0e
  53 #define STMFTS_EV_ERROR                         0x0f
  54 #define STMFTS_EV_CONTROLLER_READY              0x10
  55 #define STMFTS_EV_SLEEP_OUT_CONTROLLER_READY    0x11
  56 #define STMFTS_EV_STATUS                        0x16
  57 #define STMFTS_EV_DEBUG                         0xdb
  58
  59 /* multi touch related event masks */
  60 #define STMFTS_MASK_EVENT_ID                    0x0f
  61 #define STMFTS_MASK_TOUCH_ID                    0xf0
  62 #define STMFTS_MASK_LEFT_EVENT                  0x0f
  63 #define STMFTS_MASK_X_MSB                       0x0f
  64 #define STMFTS_MASK_Y_LSB                       0xf0
  65
  66 /* key related event masks */
  67 #define STMFTS_MASK_KEY_NO_TOUCH                0x00
  68 #define STMFTS_MASK_KEY_MENU                    0x01
  69 #define STMFTS_MASK_KEY_BACK                    0x02
  70
  71 #define STMFTS_EVENT_SIZE       8
  72 #define STMFTS_STACK_DEPTH      32
  73 #define STMFTS_DATA_MAX_SIZE    (STMFTS_EVENT_SIZE * STMFTS_STACK_DEPTH)
  74 #define STMFTS_MAX_FINGERS      10
  75 #define STMFTS_DEV_NAME         "stmfts"
  76
  77 enum stmfts_regulators {
  78         STMFTS_REGULATOR_VDD,
  79         STMFTS_REGULATOR_AVDD,
  80 };
  81
  82 struct stmfts_data {
  83         struct i2c_client *client;
  84         struct input_dev *input;
  85         struct led_classdev led_cdev;
  86         struct mutex mutex;
  87
  88         struct touchscreen_properties prop;
  89
  90         struct regulator_bulk_data regulators[2];
  91
  92         /*
  93          * Presence of ledvdd will be used also to check
  94          * whether the LED is supported.
  95          */
  96         struct regulator *ledvdd;
  97
  98         u16 chip_id;
  99         u8 chip_ver;
 100         u16 fw_ver;
 101         u8 config_id;
 102         u8 config_ver;
 103
 104         u8 data[STMFTS_DATA_MAX_SIZE];
 105
 106         struct completion cmd_done;
 107
 108         bool use_key;
 109         bool led_status;
 110         bool hover_enabled;
 111         bool running;
 112 };
 113
 114 static void stmfts_brightness_set(struct led_classdev *led_cdev,
 115                                         enum led_brightness value)
 116 {
 117         struct stmfts_data *sdata = container_of(led_cdev,
 118                                         struct stmfts_data, led_cdev);
 119         int err;
 120
 121         if (value == sdata->led_status || !sdata->ledvdd)
 122                 return;
 123
 124         if (!value) {
 125                 regulator_disable(sdata->ledvdd);
 126         } else {
 127                 err = regulator_enable(sdata->ledvdd);
 128                 if (err)
 129                         dev_warn(&sdata->client->dev,
 130                                  "failed to disable ledvdd regulator: %d\n",
 131                                  err);
 132         }
 133
 134         sdata->led_status = value;
 135 }
 136
 137 static enum led_brightness stmfts_brightness_get(struct led_classdev *led_cdev)
 138 {
 139         struct stmfts_data *sdata = container_of(led_cdev,
 140                                                 struct stmfts_data, led_cdev);
 141
 142         return !!regulator_is_enabled(sdata->ledvdd);
 143 }
 144
 145 /*
 146  * We can't simply use i2c_smbus_read_i2c_block_data because we
 147  * need to read more than 255 bytes (
 148  */
 149 static int stmfts_read_events(struct stmfts_data *sdata)
 150 {
 151         u8 cmd = STMFTS_READ_ALL_EVENT;
 152         struct i2c_msg msgs[2] = {
 153                 {
 154                         .addr   = sdata->client->addr,
 155                         .len    = 1,
 156                         .buf    = &cmd,
 157                 },
 158                 {
 159                         .addr   = sdata->client->addr,
 160                         .flags  = I2C_M_RD,
 161                         .len    = STMFTS_DATA_MAX_SIZE,
 162                         .buf    = sdata->data,
 163                 },
 164         };
 165         int ret;
 166
 167         ret = i2c_transfer(sdata->client->adapter, msgs, ARRAY_SIZE(msgs));
 168         if (ret < 0)
 169                 return ret;
 170
 171         return ret == ARRAY_SIZE(msgs) ? 0 : -EIO;
 172 }
 173
 174 static void stmfts_report_contact_event(struct stmfts_data *sdata,
 175                                         const u8 event[])
 176 {
 177         u8 slot_id = (event[0] & STMFTS_MASK_TOUCH_ID) >> 4;
 178         u16 x = event[1] | ((event[2] & STMFTS_MASK_X_MSB) << 8);
 179         u16 y = (event[2] >> 4) | (event[3] << 4);
 180         u8 maj = event[4];
 181         u8 min = event[5];
 182         u8 orientation = event[6];
 183         u8 area = event[7];
 184
 185         input_mt_slot(sdata->input, slot_id);
 186
 187         input_mt_report_slot_state(sdata->input, MT_TOOL_FINGER, true);
 188         input_report_abs(sdata->input, ABS_MT_POSITION_X, x);
 189         input_report_abs(sdata->input, ABS_MT_POSITION_Y, y);
 190         input_report_abs(sdata->input, ABS_MT_TOUCH_MAJOR, maj);
 191         input_report_abs(sdata->input, ABS_MT_TOUCH_MINOR, min);
 192         input_report_abs(sdata->input, ABS_MT_PRESSURE, area);
 193         input_report_abs(sdata->input, ABS_MT_ORIENTATION, orientation);
 194
 195         input_sync(sdata->input);
 196 }
 197
 198 static void stmfts_report_contact_release(struct stmfts_data *sdata,
 199                                           const u8 event[])
 200 {
 201         u8 slot_id = (event[0] & STMFTS_MASK_TOUCH_ID) >> 4;
 202
 203         input_mt_slot(sdata->input, slot_id);
 204         input_mt_report_slot_state(sdata->input, MT_TOOL_FINGER, false);
 205
 206         input_sync(sdata->input);
 207 }
 208
 209 static void stmfts_report_hover_event(struct stmfts_data *sdata,
 210                                       const u8 event[])
 211 {
 212         u16 x = (event[2] << 4) | (event[4] >> 4);
 213         u16 y = (event[3] << 4) | (event[4] & STMFTS_MASK_Y_LSB);
 214         u8 z = event[5];
 215
 216         input_report_abs(sdata->input, ABS_X, x);
 217         input_report_abs(sdata->input, ABS_Y, y);
 218         input_report_abs(sdata->input, ABS_DISTANCE, z);
 219
 220         input_sync(sdata->input);
 221 }
 222
 223 static void stmfts_report_key_event(struct stmfts_data *sdata, const u8 event[])
 224 {
 225         switch (event[2]) {
 226         case 0:
 227                 input_report_key(sdata->input, KEY_BACK, 0);
 228                 input_report_key(sdata->input, KEY_MENU, 0);
 229                 break;
 230
 231         case STMFTS_MASK_KEY_BACK:
 232                 input_report_key(sdata->input, KEY_BACK, 1);
 233                 break;
 234
 235         case STMFTS_MASK_KEY_MENU:
 236                 input_report_key(sdata->input, KEY_MENU, 1);
 237                 break;
 238
 239         default:
 240                 dev_warn(&sdata->client->dev,
 241                          "unknown key event: %#02x\n", event[2]);
 242                 break;
 243         }
 244
 245         input_sync(sdata->input);
 246 }
 247
 248 static void stmfts_parse_events(struct stmfts_data *sdata)
 249 {
 250         int i;
 251
 252         for (i = 0; i < STMFTS_STACK_DEPTH; i++) {
 253                 u8 *event = &sdata->data[i * STMFTS_EVENT_SIZE];
 254
 255                 switch (event[0]) {
 256
 257                 case STMFTS_EV_CONTROLLER_READY:
 258                 case STMFTS_EV_SLEEP_OUT_CONTROLLER_READY:
 259                 case STMFTS_EV_STATUS:
 260                         complete(&sdata->cmd_done);
 261                         /* fall through */
 262
 263                 case STMFTS_EV_NO_EVENT:
 264                 case STMFTS_EV_DEBUG:
 265                         return;
 266                 }
 267
 268                 switch (event[0] & STMFTS_MASK_EVENT_ID) {
 269
 270                 case STMFTS_EV_MULTI_TOUCH_ENTER:
 271                 case STMFTS_EV_MULTI_TOUCH_MOTION:
 272                         stmfts_report_contact_event(sdata, event);
 273                         break;
 274
 275                 case STMFTS_EV_MULTI_TOUCH_LEAVE:
 276                         stmfts_report_contact_release(sdata, event);
 277                         break;
 278
 279                 case STMFTS_EV_HOVER_ENTER:
 280                 case STMFTS_EV_HOVER_LEAVE:
 281                 case STMFTS_EV_HOVER_MOTION:
 282                         stmfts_report_hover_event(sdata, event);
 283                         break;
 284
 285                 case STMFTS_EV_KEY_STATUS:
 286                         stmfts_report_key_event(sdata, event);
 287                         break;
 288
 289                 case STMFTS_EV_ERROR:
 290                         dev_warn(&sdata->client->dev,
 291                                         "error code: 0x%x%x%x%x%x%x",
 292                                         event[6], event[5], event[4],
 293                                         event[3], event[2], event[1]);
 294                         break;
 295
 296                 default:
 297                         dev_err(&sdata->client->dev,
 298                                 "unknown event %#02x\n", event[0]);
 299                 }
 300         }
 301 }
 302
 303 static irqreturn_t stmfts_irq_handler(int irq, void *dev)
 304 {
 305         struct stmfts_data *sdata = dev;
 306         int err;
 307
 308         mutex_lock(&sdata->mutex);
 309
 310         err = stmfts_read_events(sdata);
 311         if (unlikely(err))
 312                 dev_err(&sdata->client->dev,
 313                         "failed to read events: %d\n", err);
 314         else
 315                 stmfts_parse_events(sdata);
 316
 317         mutex_unlock(&sdata->mutex);
 318         return IRQ_HANDLED;
 319 }
 320
 321 static int stmfts_command(struct stmfts_data *sdata, const u8 cmd)
 322 {
 323         int err;
 324
 325         reinit_completion(&sdata->cmd_done);
 326
 327         err = i2c_smbus_write_byte(sdata->client, cmd);
 328         if (err)
 329                 return err;
 330
 331         if (!wait_for_completion_timeout(&sdata->cmd_done,
 332                                          msecs_to_jiffies(1000)))
 333                 return -ETIMEDOUT;
 334
 335         return 0;
 336 }
 337
 338 static int stmfts_input_open(struct input_dev *dev)
 339 {
 340         struct stmfts_data *sdata = input_get_drvdata(dev);
 341         int err;
 342
 343         err = pm_runtime_get_sync(&sdata->client->dev);
 344         if (err < 0)
 345                 return err;
 346
 347         err = i2c_smbus_write_byte(sdata->client, STMFTS_MS_MT_SENSE_ON);
 348         if (err)
 349                 return err;
 350
 351         mutex_lock(&sdata->mutex);
 352         sdata->running = true;
 353
 354         if (sdata->hover_enabled) {
 355                 err = i2c_smbus_write_byte(sdata->client,
 356                                            STMFTS_SS_HOVER_SENSE_ON);
 357                 if (err)
 358                         dev_warn(&sdata->client->dev,
 359                                  "failed to enable hover\n");
 360         }
 361         mutex_unlock(&sdata->mutex);
 362
 363         if (sdata->use_key) {
 364                 err = i2c_smbus_write_byte(sdata->client,
 365                                            STMFTS_MS_KEY_SENSE_ON);
 366                 if (err)
 367                         /* I can still use only the touch screen */
 368                         dev_warn(&sdata->client->dev,
 369                                  "failed to enable touchkey\n");
 370         }
 371
 372         return 0;
 373 }
 374
 375 static void stmfts_input_close(struct input_dev *dev)
 376 {
 377         struct stmfts_data *sdata = input_get_drvdata(dev);
 378         int err;
 379
 380         err = i2c_smbus_write_byte(sdata->client, STMFTS_MS_MT_SENSE_OFF);
 381         if (err)
 382                 dev_warn(&sdata->client->dev,
 383                          "failed to disable touchscreen: %d\n", err);
 384
 385         mutex_lock(&sdata->mutex);
 386
 387         sdata->running = false;
 388
 389         if (sdata->hover_enabled) {
 390                 err = i2c_smbus_write_byte(sdata->client,
 391                                            STMFTS_SS_HOVER_SENSE_OFF);
 392                 if (err)
 393                         dev_warn(&sdata->client->dev,
 394                                  "failed to disable hover: %d\n", err);
 395         }
 396         mutex_unlock(&sdata->mutex);
 397
 398         if (sdata->use_key) {
 399                 err = i2c_smbus_write_byte(sdata->client,
 400                                            STMFTS_MS_KEY_SENSE_OFF);
 401                 if (err)
 402                         dev_warn(&sdata->client->dev,
 403                                  "failed to disable touchkey: %d\n", err);
 404         }
 405
 406         pm_runtime_put_sync(&sdata->client->dev);
 407 }
 408
 409 static ssize_t stmfts_sysfs_chip_id(struct device *dev,
 410                                 struct device_attribute *attr, char *buf)
 411 {
 412         struct stmfts_data *sdata = dev_get_drvdata(dev);
 413
 414         return sprintf(buf, "%#x\n", sdata->chip_id);
 415 }
 416
 417 static ssize_t stmfts_sysfs_chip_version(struct device *dev,
 418                                 struct device_attribute *attr, char *buf)
 419 {
 420         struct stmfts_data *sdata = dev_get_drvdata(dev);
 421
 422         return sprintf(buf, "%u\n", sdata->chip_ver);
 423 }
 424
 425 static ssize_t stmfts_sysfs_fw_ver(struct device *dev,
 426                                 struct device_attribute *attr, char *buf)
 427 {
 428         struct stmfts_data *sdata = dev_get_drvdata(dev);
 429
 430         return sprintf(buf, "%u\n", sdata->fw_ver);
 431 }
 432
 433 static ssize_t stmfts_sysfs_config_id(struct device *dev,
 434                                 struct device_attribute *attr, char *buf)
 435 {
 436         struct stmfts_data *sdata = dev_get_drvdata(dev);
 437
 438         return sprintf(buf, "%#x\n", sdata->config_id);
 439 }
 440
 441 static ssize_t stmfts_sysfs_config_version(struct device *dev,
 442                                 struct device_attribute *attr, char *buf)
 443 {
 444         struct stmfts_data *sdata = dev_get_drvdata(dev);
 445
 446         return sprintf(buf, "%u\n", sdata->config_ver);
 447 }
 448
 449 static ssize_t stmfts_sysfs_read_status(struct device *dev,
 450                                 struct device_attribute *attr, char *buf)
 451 {
 452         struct stmfts_data *sdata = dev_get_drvdata(dev);
 453         u8 status[4];
 454         int err;
 455
 456         err = i2c_smbus_read_i2c_block_data(sdata->client, STMFTS_READ_STATUS,
 457                                             sizeof(status), status);
 458         if (err)
 459                 return err;
 460
 461         return sprintf(buf, "%#02x\n", status[0]);
 462 }
 463
 464 static ssize_t stmfts_sysfs_hover_enable_read(struct device *dev,
 465                                 struct device_attribute *attr, char *buf)
 466 {
 467         struct stmfts_data *sdata = dev_get_drvdata(dev);
 468
 469         return sprintf(buf, "%u\n", sdata->hover_enabled);
 470 }
 471
 472 static ssize_t stmfts_sysfs_hover_enable_write(struct device *dev,
 473                                 struct device_attribute *attr,
 474                                 const char *buf, size_t len)
 475 {
 476         struct stmfts_data *sdata = dev_get_drvdata(dev);
 477         unsigned long value;
 478         int err = 0;
 479
 480         if (kstrtoul(buf, 0, &value))
 481                 return -EINVAL;
 482
 483         mutex_lock(&sdata->mutex);
 484
 485         if (value & sdata->hover_enabled)
 486                 goto out;
 487
 488         if (sdata->running)
 489                 err = i2c_smbus_write_byte(sdata->client,
 490                                            value ? STMFTS_SS_HOVER_SENSE_ON :
 491                                                    STMFTS_SS_HOVER_SENSE_OFF);
 492
 493         if (!err)
 494                 sdata->hover_enabled = !!value;
 495
 496 out:
 497         mutex_unlock(&sdata->mutex);
 498
 499         return len;
 500 }
 501
 502 static DEVICE_ATTR(chip_id, 0444, stmfts_sysfs_chip_id, NULL);
 503 static DEVICE_ATTR(chip_version, 0444, stmfts_sysfs_chip_version, NULL);
 504 static DEVICE_ATTR(fw_ver, 0444, stmfts_sysfs_fw_ver, NULL);
 505 static DEVICE_ATTR(config_id, 0444, stmfts_sysfs_config_id, NULL);
 506 static DEVICE_ATTR(config_version, 0444, stmfts_sysfs_config_version, NULL);
 507 static DEVICE_ATTR(status, 0444, stmfts_sysfs_read_status, NULL);
 508 static DEVICE_ATTR(hover_enable, 0644, stmfts_sysfs_hover_enable_read,
 509                                         stmfts_sysfs_hover_enable_write);
 510
 511 static struct attribute *stmfts_sysfs_attrs[] = {
 512         &dev_attr_chip_id.attr,
 513         &dev_attr_chip_version.attr,
 514         &dev_attr_fw_ver.attr,
 515         &dev_attr_config_id.attr,
 516         &dev_attr_config_version.attr,
 517         &dev_attr_status.attr,
 518         &dev_attr_hover_enable.attr,
 519         NULL
 520 };
 521
 522 static struct attribute_group stmfts_attribute_group = {
 523         .attrs = stmfts_sysfs_attrs
 524 };
 525
 526 static int stmfts_power_on(struct stmfts_data *sdata)
 527 {
 528         int err;
 529         u8 reg[8];
 530
 531         err = regulator_bulk_enable(ARRAY_SIZE(sdata->regulators),
 532                                     sdata->regulators);
 533         if (err)
 534                 return err;
 535
 536         /*
 537          * The datasheet does not specify the power on time, but considering
 538          * that the reset time is < 10ms, I sleep 20ms to be sure
 539          */
 540         msleep(20);
 541
 542         err = i2c_smbus_read_i2c_block_data(sdata->client, STMFTS_READ_INFO,
 543                                             sizeof(reg), reg);
 544         if (err < 0)
 545                 return err;
 546         if (err != sizeof(reg))
 547                 return -EIO;
 548
 549         sdata->chip_id = be16_to_cpup((__be16 *)&reg[6]);
 550         sdata->chip_ver = reg[0];
 551         sdata->fw_ver = be16_to_cpup((__be16 *)&reg[2]);
 552         sdata->config_id = reg[4];
 553         sdata->config_ver = reg[5];
 554
 555         enable_irq(sdata->client->irq);
 556
 557         msleep(50);
 558
 559         err = stmfts_command(sdata, STMFTS_SYSTEM_RESET);
 560         if (err)
 561                 return err;
 562
 563         err = stmfts_command(sdata, STMFTS_SLEEP_OUT);
 564         if (err)
 565                 return err;
 566
 567         /* optional tuning */
 568         err = stmfts_command(sdata, STMFTS_MS_CX_TUNING);
 569         if (err)
 570                 dev_warn(&sdata->client->dev,
 571                          "failed to perform mutual auto tune: %d\n", err);
 572
 573         /* optional tuning */
 574         err = stmfts_command(sdata, STMFTS_SS_CX_TUNING);
 575         if (err)
 576                 dev_warn(&sdata->client->dev,
 577                          "failed to perform self auto tune: %d\n", err);
 578
 579         err = stmfts_command(sdata, STMFTS_FULL_FORCE_CALIBRATION);
 580         if (err)
 581                 return err;
 582
 583         /*
 584          * At this point no one is using the touchscreen
 585          * and I don't really care about the return value
 586          */
 587         (void) i2c_smbus_write_byte(sdata->client, STMFTS_SLEEP_IN);
 588
 589         return 0;
 590 }
 591
 592 static void stmfts_power_off(void *data)
 593 {
 594         struct stmfts_data *sdata = data;
 595
 596         disable_irq(sdata->client->irq);
 597         regulator_bulk_disable(ARRAY_SIZE(sdata->regulators),
 598                                                 sdata->regulators);
 599 }
 600
 601 /* This function is void because I don't want to prevent using the touch key
 602  * only because the LEDs don't get registered
 603  */
 604 static int stmfts_enable_led(struct stmfts_data *sdata)
 605 {
 606         int err;
 607
 608         /* get the regulator for powering the leds on */
 609         sdata->ledvdd = devm_regulator_get(&sdata->client->dev, "ledvdd");
 610         if (IS_ERR(sdata->ledvdd))
 611                 return PTR_ERR(sdata->ledvdd);
 612
 613         sdata->led_cdev.name = STMFTS_DEV_NAME;
 614         sdata->led_cdev.max_brightness = LED_ON;
 615         sdata->led_cdev.brightness = LED_OFF;
 616         sdata->led_cdev.brightness_set = stmfts_brightness_set;
 617         sdata->led_cdev.brightness_get = stmfts_brightness_get;
 618
 619         err = devm_led_classdev_register(&sdata->client->dev, &sdata->led_cdev);
 620         if (err) {
 621                 devm_regulator_put(sdata->ledvdd);
 622                 return err;
 623         }
 624
 625         return 0;
 626 }
 627
 628 static int stmfts_probe(struct i2c_client *client,
 629                         const struct i2c_device_id *id)
 630 {
 631         int err;
 632         struct stmfts_data *sdata;
 633
 634         if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C |
 635                                                 I2C_FUNC_SMBUS_BYTE_DATA |
 636                                                 I2C_FUNC_SMBUS_I2C_BLOCK))
 637                 return -ENODEV;
 638
 639         sdata = devm_kzalloc(&client->dev, sizeof(*sdata), GFP_KERNEL);
 640         if (!sdata)
 641                 return -ENOMEM;
 642
 643         i2c_set_clientdata(client, sdata);
 644
 645         sdata->client = client;
 646         mutex_init(&sdata->mutex);
 647         init_completion(&sdata->cmd_done);
 648
 649         sdata->regulators[STMFTS_REGULATOR_VDD].supply = "vdd";
 650         sdata->regulators[STMFTS_REGULATOR_AVDD].supply = "avdd";
 651         err = devm_regulator_bulk_get(&client->dev,
 652                                       ARRAY_SIZE(sdata->regulators),
 653                                       sdata->regulators);
 654         if (err)
 655                 return err;
 656
 657         sdata->input = devm_input_allocate_device(&client->dev);
 658         if (!sdata->input)
 659                 return -ENOMEM;
 660
 661         sdata->input->name = STMFTS_DEV_NAME;
 662         sdata->input->id.bustype = BUS_I2C;
 663         sdata->input->open = stmfts_input_open;
 664         sdata->input->close = stmfts_input_close;
 665
 666         input_set_capability(sdata->input, EV_ABS, ABS_MT_POSITION_X);
 667         input_set_capability(sdata->input, EV_ABS, ABS_MT_POSITION_Y);
 668         touchscreen_parse_properties(sdata->input, true, &sdata->prop);
 669
 670         input_set_abs_params(sdata->input, ABS_MT_TOUCH_MAJOR, 0, 255, 0, 0);
 671         input_set_abs_params(sdata->input, ABS_MT_TOUCH_MINOR, 0, 255, 0, 0);
 672         input_set_abs_params(sdata->input, ABS_MT_ORIENTATION, 0, 255, 0, 0);
 673         input_set_abs_params(sdata->input, ABS_MT_PRESSURE, 0, 255, 0, 0);
 674         input_set_abs_params(sdata->input, ABS_DISTANCE, 0, 255, 0, 0);
 675
 676         sdata->use_key = device_property_read_bool(&client->dev,
 677                                                    "touch-key-connected");
 678         if (sdata->use_key) {
 679                 input_set_capability(sdata->input, EV_KEY, KEY_MENU);
 680                 input_set_capability(sdata->input, EV_KEY, KEY_BACK);
 681         }
 682
 683         err = input_mt_init_slots(sdata->input,
 684                                   STMFTS_MAX_FINGERS, INPUT_MT_DIRECT);
 685         if (err)
 686                 return err;
 687
 688         input_set_drvdata(sdata->input, sdata);
 689
 690         /*
 691          * stmfts_power_on expects interrupt to be disabled, but
 692          * at this point the device is still off and I do not trust
 693          * the status of the irq line that can generate some spurious
 694          * interrupts. To be on the safe side it's better to not enable
 695          * the interrupts during their request.
 696          */
 697         irq_set_status_flags(client->irq, IRQ_NOAUTOEN);
 698         err = devm_request_threaded_irq(&client->dev, client->irq,
 699                                         NULL, stmfts_irq_handler,
 700                                         IRQF_ONESHOT,
 701                                         "stmfts_irq", sdata);
 702         if (err)
 703                 return err;
 704
 705         dev_dbg(&client->dev, "initializing ST-Microelectronics FTS...\n");
 706
 707         err = stmfts_power_on(sdata);
 708         if (err)
 709                 return err;
 710
 711         err = devm_add_action_or_reset(&client->dev, stmfts_power_off, sdata);
 712         if (err)
 713                 return err;
 714
 715         err = input_register_device(sdata->input);
 716         if (err)
 717                 return err;
 718
 719         if (sdata->use_key) {
 720                 err = stmfts_enable_led(sdata);
 721                 if (err) {
 722                         /*
 723                          * Even if the LEDs have failed to be initialized and
 724                          * used in the driver, I can still use the device even
 725                          * without LEDs. The ledvdd regulator pointer will be
 726                          * used as a flag.
 727                          */
 728                         dev_warn(&client->dev, "unable to use touchkey leds\n");
 729                         sdata->ledvdd = NULL;
 730                 }
 731         }
 732
 733         err = sysfs_create_group(&sdata->client->dev.kobj,
 734                                  &stmfts_attribute_group);
 735         if (err)
 736                 return err;
 737
 738         pm_runtime_enable(&client->dev);
 739
 740         return 0;
 741 }
 742
 743 static int stmfts_remove(struct i2c_client *client)
 744 {
 745         pm_runtime_disable(&client->dev);
 746         sysfs_remove_group(&client->dev.kobj, &stmfts_attribute_group);
 747
 748         return 0;
 749 }
 750
 751 static int __maybe_unused stmfts_runtime_suspend(struct device *dev)
 752 {
 753         struct stmfts_data *sdata = dev_get_drvdata(dev);
 754         int ret;
 755
 756         ret = i2c_smbus_write_byte(sdata->client, STMFTS_SLEEP_IN);
 757         if (ret)
 758                 dev_warn(dev, "failed to suspend device: %d\n", ret);
 759
 760         return ret;
 761 }
 762
 763 static int __maybe_unused stmfts_runtime_resume(struct device *dev)
 764 {
 765         struct stmfts_data *sdata = dev_get_drvdata(dev);
 766         int ret;
 767
 768         ret = i2c_smbus_write_byte(sdata->client, STMFTS_SLEEP_OUT);
 769         if (ret)
 770                 dev_err(dev, "failed to resume device: %d\n", ret);
 771
 772         return ret;
 773 }
 774
 775 static int __maybe_unused stmfts_suspend(struct device *dev)
 776 {
 777         struct stmfts_data *sdata = dev_get_drvdata(dev);
 778
 779         stmfts_power_off(sdata);
 780
 781         return 0;
 782 }
 783
 784 static int __maybe_unused stmfts_resume(struct device *dev)
 785 {
 786         struct stmfts_data *sdata = dev_get_drvdata(dev);
 787
 788         return stmfts_power_on(sdata);
 789 }
 790
 791 static const struct dev_pm_ops stmfts_pm_ops = {
 792         SET_SYSTEM_SLEEP_PM_OPS(stmfts_suspend, stmfts_resume)
 793         SET_RUNTIME_PM_OPS(stmfts_runtime_suspend, stmfts_runtime_resume, NULL)
 794 };
 795
 796 #ifdef CONFIG_OF
 797 static const struct of_device_id stmfts_of_match[] = {
 798         { .compatible = "st,stmfts", },
 799         { },
 800 };
 801 MODULE_DEVICE_TABLE(of, stmfts_of_match);
 802 #endif
 803
 804 static const struct i2c_device_id stmfts_id[] = {
 805         { "stmfts", 0 },
 806         { },
 807 };
 808 MODULE_DEVICE_TABLE(i2c, stmfts_id);
 809
 810 static struct i2c_driver stmfts_driver = {
 811         .driver = {
 812                 .name = STMFTS_DEV_NAME,
 813                 .of_match_table = of_match_ptr(stmfts_of_match),
 814                 .pm = &stmfts_pm_ops,
 815         },
 816         .probe = stmfts_probe,
 817         .remove = stmfts_remove,
 818         .id_table = stmfts_id,
 819 };
 820
 821 module_i2c_driver(stmfts_driver);
 822
 823 MODULE_AUTHOR("Andi Shyti <andi.shyti@samsung.com>");
 824 MODULE_DESCRIPTION("STMicroelectronics FTS Touch Screen");
 825 MODULE_LICENSE("GPL v2");