drivers/iio/light/cm36651.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Copyright (C) 2013 Samsung Electronics Co., Ltd.
   4  * Author: Beomho Seo <beomho.seo@samsung.com>
   5  */
   6
   7 #include <linux/delay.h>
   8 #include <linux/err.h>
   9 #include <linux/i2c.h>
  10 #include <linux/mutex.h>
  11 #include <linux/module.h>
  12 #include <linux/interrupt.h>
  13 #include <linux/regulator/consumer.h>
  14 #include <linux/iio/iio.h>
  15 #include <linux/iio/sysfs.h>
  16 #include <linux/iio/events.h>
  17
  18 /* Slave address 0x19 for PS of 7 bit addressing protocol for I2C */
  19 #define CM36651_I2C_ADDR_PS             0x19
  20 /* Alert Response Address */
  21 #define CM36651_ARA                     0x0C
  22
  23 /* Ambient light sensor */
  24 #define CM36651_CS_CONF1                0x00
  25 #define CM36651_CS_CONF2                0x01
  26 #define CM36651_ALS_WH_M                0x02
  27 #define CM36651_ALS_WH_L                0x03
  28 #define CM36651_ALS_WL_M                0x04
  29 #define CM36651_ALS_WL_L                0x05
  30 #define CM36651_CS_CONF3                0x06
  31 #define CM36651_CS_CONF_REG_NUM         0x02
  32
  33 /* Proximity sensor */
  34 #define CM36651_PS_CONF1                0x00
  35 #define CM36651_PS_THD                  0x01
  36 #define CM36651_PS_CANC                 0x02
  37 #define CM36651_PS_CONF2                0x03
  38 #define CM36651_PS_REG_NUM              0x04
  39
  40 /* CS_CONF1 command code */
  41 #define CM36651_ALS_ENABLE              0x00
  42 #define CM36651_ALS_DISABLE             0x01
  43 #define CM36651_ALS_INT_EN              0x02
  44 #define CM36651_ALS_THRES               0x04
  45
  46 /* CS_CONF2 command code */
  47 #define CM36651_CS_CONF2_DEFAULT_BIT    0x08
  48
  49 /* CS_CONF3 channel integration time */
  50 #define CM36651_CS_IT1                  0x00 /* Integration time 80 msec */
  51 #define CM36651_CS_IT2                  0x40 /* Integration time 160 msec */
  52 #define CM36651_CS_IT3                  0x80 /* Integration time 320 msec */
  53 #define CM36651_CS_IT4                  0xC0 /* Integration time 640 msec */
  54
  55 /* PS_CONF1 command code */
  56 #define CM36651_PS_ENABLE               0x00
  57 #define CM36651_PS_DISABLE              0x01
  58 #define CM36651_PS_INT_EN               0x02
  59 #define CM36651_PS_PERS2                0x04
  60 #define CM36651_PS_PERS3                0x08
  61 #define CM36651_PS_PERS4                0x0C
  62
  63 /* PS_CONF1 command code: integration time */
  64 #define CM36651_PS_IT1                  0x00 /* Integration time 0.32 msec */
  65 #define CM36651_PS_IT2                  0x10 /* Integration time 0.42 msec */
  66 #define CM36651_PS_IT3                  0x20 /* Integration time 0.52 msec */
  67 #define CM36651_PS_IT4                  0x30 /* Integration time 0.64 msec */
  68
  69 /* PS_CONF1 command code: duty ratio */
  70 #define CM36651_PS_DR1                  0x00 /* Duty ratio 1/80 */
  71 #define CM36651_PS_DR2                  0x40 /* Duty ratio 1/160 */
  72 #define CM36651_PS_DR3                  0x80 /* Duty ratio 1/320 */
  73 #define CM36651_PS_DR4                  0xC0 /* Duty ratio 1/640 */
  74
  75 /* PS_THD command code */
  76 #define CM36651_PS_INITIAL_THD          0x05
  77
  78 /* PS_CANC command code */
  79 #define CM36651_PS_CANC_DEFAULT         0x00
  80
  81 /* PS_CONF2 command code */
  82 #define CM36651_PS_HYS1                 0x00
  83 #define CM36651_PS_HYS2                 0x01
  84 #define CM36651_PS_SMART_PERS_EN        0x02
  85 #define CM36651_PS_DIR_INT              0x04
  86 #define CM36651_PS_MS                   0x10
  87
  88 #define CM36651_CS_COLOR_NUM            4
  89
  90 #define CM36651_CLOSE_PROXIMITY         0x32
  91 #define CM36651_FAR_PROXIMITY                   0x33
  92
  93 #define CM36651_CS_INT_TIME_AVAIL       "0.08 0.16 0.32 0.64"
  94 #define CM36651_PS_INT_TIME_AVAIL       "0.000320 0.000420 0.000520 0.000640"
  95
  96 enum cm36651_operation_mode {
  97         CM36651_LIGHT_EN,
  98         CM36651_PROXIMITY_EN,
  99         CM36651_PROXIMITY_EV_EN,
 100 };
 101
 102 enum cm36651_light_channel_idx {
 103         CM36651_LIGHT_CHANNEL_IDX_RED,
 104         CM36651_LIGHT_CHANNEL_IDX_GREEN,
 105         CM36651_LIGHT_CHANNEL_IDX_BLUE,
 106         CM36651_LIGHT_CHANNEL_IDX_CLEAR,
 107 };
 108
 109 enum cm36651_command {
 110         CM36651_CMD_READ_RAW_LIGHT,
 111         CM36651_CMD_READ_RAW_PROXIMITY,
 112         CM36651_CMD_PROX_EV_EN,
 113         CM36651_CMD_PROX_EV_DIS,
 114 };
 115
 116 static const u8 cm36651_cs_reg[CM36651_CS_CONF_REG_NUM] = {
 117         CM36651_CS_CONF1,
 118         CM36651_CS_CONF2,
 119 };
 120
 121 static const u8 cm36651_ps_reg[CM36651_PS_REG_NUM] = {
 122         CM36651_PS_CONF1,
 123         CM36651_PS_THD,
 124         CM36651_PS_CANC,
 125         CM36651_PS_CONF2,
 126 };
 127
 128 struct cm36651_data {
 129         const struct cm36651_platform_data *pdata;
 130         struct i2c_client *client;
 131         struct i2c_client *ps_client;
 132         struct i2c_client *ara_client;
 133         struct mutex lock;
 134         struct regulator *vled_reg;
 135         unsigned long flags;
 136         int cs_int_time[CM36651_CS_COLOR_NUM];
 137         int ps_int_time;
 138         u8 cs_ctrl_regs[CM36651_CS_CONF_REG_NUM];
 139         u8 ps_ctrl_regs[CM36651_PS_REG_NUM];
 140         u16 color[CM36651_CS_COLOR_NUM];
 141 };
 142
 143 static int cm36651_setup_reg(struct cm36651_data *cm36651)
 144 {
 145         struct i2c_client *client = cm36651->client;
 146         struct i2c_client *ps_client = cm36651->ps_client;
 147         int i, ret;
 148
 149         /* CS initialization */
 150         cm36651->cs_ctrl_regs[CM36651_CS_CONF1] = CM36651_ALS_ENABLE |
 151                                                              CM36651_ALS_THRES;
 152         cm36651->cs_ctrl_regs[CM36651_CS_CONF2] = CM36651_CS_CONF2_DEFAULT_BIT;
 153
 154         for (i = 0; i < CM36651_CS_CONF_REG_NUM; i++) {
 155                 ret = i2c_smbus_write_byte_data(client, cm36651_cs_reg[i],
 156                                                      cm36651->cs_ctrl_regs[i]);
 157                 if (ret < 0)
 158                         return ret;
 159         }
 160
 161         /* PS initialization */
 162         cm36651->ps_ctrl_regs[CM36651_PS_CONF1] = CM36651_PS_ENABLE |
 163                                                                 CM36651_PS_IT2;
 164         cm36651->ps_ctrl_regs[CM36651_PS_THD] = CM36651_PS_INITIAL_THD;
 165         cm36651->ps_ctrl_regs[CM36651_PS_CANC] = CM36651_PS_CANC_DEFAULT;
 166         cm36651->ps_ctrl_regs[CM36651_PS_CONF2] = CM36651_PS_HYS2 |
 167                                 CM36651_PS_DIR_INT | CM36651_PS_SMART_PERS_EN;
 168
 169         for (i = 0; i < CM36651_PS_REG_NUM; i++) {
 170                 ret = i2c_smbus_write_byte_data(ps_client, cm36651_ps_reg[i],
 171                                                      cm36651->ps_ctrl_regs[i]);
 172                 if (ret < 0)
 173                         return ret;
 174         }
 175
 176         /* Set shutdown mode */
 177         ret = i2c_smbus_write_byte_data(client, CM36651_CS_CONF1,
 178                                                           CM36651_ALS_DISABLE);
 179         if (ret < 0)
 180                 return ret;
 181
 182         ret = i2c_smbus_write_byte_data(cm36651->ps_client,
 183                                          CM36651_PS_CONF1, CM36651_PS_DISABLE);
 184         if (ret < 0)
 185                 return ret;
 186
 187         return 0;
 188 }
 189
 190 static int cm36651_read_output(struct cm36651_data *cm36651,
 191                                 struct iio_chan_spec const *chan, int *val)
 192 {
 193         struct i2c_client *client = cm36651->client;
 194         int ret = -EINVAL;
 195
 196         switch (chan->type) {
 197         case IIO_LIGHT:
 198                 *val = i2c_smbus_read_word_data(client, chan->address);
 199                 if (*val < 0)
 200                         return ret;
 201
 202                 ret = i2c_smbus_write_byte_data(client, CM36651_CS_CONF1,
 203                                                         CM36651_ALS_DISABLE);
 204                 if (ret < 0)
 205                         return ret;
 206
 207                 ret = IIO_VAL_INT;
 208                 break;
 209         case IIO_PROXIMITY:
 210                 *val = i2c_smbus_read_byte(cm36651->ps_client);
 211                 if (*val < 0)
 212                         return ret;
 213
 214                 if (!test_bit(CM36651_PROXIMITY_EV_EN, &cm36651->flags)) {
 215                         ret = i2c_smbus_write_byte_data(cm36651->ps_client,
 216                                         CM36651_PS_CONF1, CM36651_PS_DISABLE);
 217                         if (ret < 0)
 218                                 return ret;
 219                 }
 220
 221                 ret = IIO_VAL_INT;
 222                 break;
 223         default:
 224                 break;
 225         }
 226
 227         return ret;
 228 }
 229
 230 static irqreturn_t cm36651_irq_handler(int irq, void *data)
 231 {
 232         struct iio_dev *indio_dev = data;
 233         struct cm36651_data *cm36651 = iio_priv(indio_dev);
 234         struct i2c_client *client = cm36651->client;
 235         int ev_dir, ret;
 236         u64 ev_code;
 237
 238         /*
 239          * The PS INT pin is an active low signal that PS INT move logic low
 240          * when the object is detect. Once the MCU host received the PS INT
 241          * "LOW" signal, the Host needs to read the data at Alert Response
 242          * Address(ARA) to clear the PS INT signal. After clearing the PS
 243          * INT pin, the PS INT signal toggles from low to high.
 244          */
 245         ret = i2c_smbus_read_byte(cm36651->ara_client);
 246         if (ret < 0) {
 247                 dev_err(&client->dev,
 248                                 "%s: Data read failed: %d\n", __func__, ret);
 249                 return IRQ_HANDLED;
 250         }
 251         switch (ret) {
 252         case CM36651_CLOSE_PROXIMITY:
 253                 ev_dir = IIO_EV_DIR_RISING;
 254                 break;
 255         case CM36651_FAR_PROXIMITY:
 256                 ev_dir = IIO_EV_DIR_FALLING;
 257                 break;
 258         default:
 259                 dev_err(&client->dev,
 260                         "%s: Data read wrong: %d\n", __func__, ret);
 261                 return IRQ_HANDLED;
 262         }
 263
 264         ev_code = IIO_UNMOD_EVENT_CODE(IIO_PROXIMITY,
 265                                 CM36651_CMD_READ_RAW_PROXIMITY,
 266                                 IIO_EV_TYPE_THRESH, ev_dir);
 267
 268         iio_push_event(indio_dev, ev_code, iio_get_time_ns(indio_dev));
 269
 270         return IRQ_HANDLED;
 271 }
 272
 273 static int cm36651_set_operation_mode(struct cm36651_data *cm36651, int cmd)
 274 {
 275         struct i2c_client *client = cm36651->client;
 276         struct i2c_client *ps_client = cm36651->ps_client;
 277         int ret = -EINVAL;
 278
 279         switch (cmd) {
 280         case CM36651_CMD_READ_RAW_LIGHT:
 281                 ret = i2c_smbus_write_byte_data(client, CM36651_CS_CONF1,
 282                                 cm36651->cs_ctrl_regs[CM36651_CS_CONF1]);
 283                 break;
 284         case CM36651_CMD_READ_RAW_PROXIMITY:
 285                 if (test_bit(CM36651_PROXIMITY_EV_EN, &cm36651->flags))
 286                         return CM36651_PROXIMITY_EV_EN;
 287
 288                 ret = i2c_smbus_write_byte_data(ps_client, CM36651_PS_CONF1,
 289                                 cm36651->ps_ctrl_regs[CM36651_PS_CONF1]);
 290                 break;
 291         case CM36651_CMD_PROX_EV_EN:
 292                 if (test_bit(CM36651_PROXIMITY_EV_EN, &cm36651->flags)) {
 293                         dev_err(&client->dev,
 294                                 "Already proximity event enable state\n");
 295                         return ret;
 296                 }
 297                 set_bit(CM36651_PROXIMITY_EV_EN, &cm36651->flags);
 298
 299                 ret = i2c_smbus_write_byte_data(ps_client,
 300                         cm36651_ps_reg[CM36651_PS_CONF1],
 301                         CM36651_PS_INT_EN | CM36651_PS_PERS2 | CM36651_PS_IT2);
 302
 303                 if (ret < 0) {
 304                         dev_err(&client->dev, "Proximity enable event failed\n");
 305                         return ret;
 306                 }
 307                 break;
 308         case CM36651_CMD_PROX_EV_DIS:
 309                 if (!test_bit(CM36651_PROXIMITY_EV_EN, &cm36651->flags)) {
 310                         dev_err(&client->dev,
 311                                 "Already proximity event disable state\n");
 312                         return ret;
 313                 }
 314                 clear_bit(CM36651_PROXIMITY_EV_EN, &cm36651->flags);
 315                 ret = i2c_smbus_write_byte_data(ps_client,
 316                                         CM36651_PS_CONF1, CM36651_PS_DISABLE);
 317                 break;
 318         }
 319
 320         if (ret < 0)
 321                 dev_err(&client->dev, "Write register failed\n");
 322
 323         return ret;
 324 }
 325
 326 static int cm36651_read_channel(struct cm36651_data *cm36651,
 327                                 struct iio_chan_spec const *chan, int *val)
 328 {
 329         struct i2c_client *client = cm36651->client;
 330         int cmd, ret;
 331
 332         if (chan->type == IIO_LIGHT)
 333                 cmd = CM36651_CMD_READ_RAW_LIGHT;
 334         else if (chan->type == IIO_PROXIMITY)
 335                 cmd = CM36651_CMD_READ_RAW_PROXIMITY;
 336         else
 337                 return -EINVAL;
 338
 339         ret = cm36651_set_operation_mode(cm36651, cmd);
 340         if (ret < 0) {
 341                 dev_err(&client->dev, "CM36651 set operation mode failed\n");
 342                 return ret;
 343         }
 344         /* Delay for work after enable operation */
 345         msleep(50);
 346         ret = cm36651_read_output(cm36651, chan, val);
 347         if (ret < 0) {
 348                 dev_err(&client->dev, "CM36651 read output failed\n");
 349                 return ret;
 350         }
 351
 352         return ret;
 353 }
 354
 355 static int cm36651_read_int_time(struct cm36651_data *cm36651,
 356                                 struct iio_chan_spec const *chan, int *val2)
 357 {
 358         switch (chan->type) {
 359         case IIO_LIGHT:
 360                 if (cm36651->cs_int_time[chan->address] == CM36651_CS_IT1)
 361                         *val2 = 80000;
 362                 else if (cm36651->cs_int_time[chan->address] == CM36651_CS_IT2)
 363                         *val2 = 160000;
 364                 else if (cm36651->cs_int_time[chan->address] == CM36651_CS_IT3)
 365                         *val2 = 320000;
 366                 else if (cm36651->cs_int_time[chan->address] == CM36651_CS_IT4)
 367                         *val2 = 640000;
 368                 else
 369                         return -EINVAL;
 370                 break;
 371         case IIO_PROXIMITY:
 372                 if (cm36651->ps_int_time == CM36651_PS_IT1)
 373                         *val2 = 320;
 374                 else if (cm36651->ps_int_time == CM36651_PS_IT2)
 375                         *val2 = 420;
 376                 else if (cm36651->ps_int_time == CM36651_PS_IT3)
 377                         *val2 = 520;
 378                 else if (cm36651->ps_int_time == CM36651_PS_IT4)
 379                         *val2 = 640;
 380                 else
 381                         return -EINVAL;
 382                 break;
 383         default:
 384                 return -EINVAL;
 385         }
 386
 387         return IIO_VAL_INT_PLUS_MICRO;
 388 }
 389
 390 static int cm36651_write_int_time(struct cm36651_data *cm36651,
 391                                 struct iio_chan_spec const *chan, int val)
 392 {
 393         struct i2c_client *client = cm36651->client;
 394         struct i2c_client *ps_client = cm36651->ps_client;
 395         int int_time, ret;
 396
 397         switch (chan->type) {
 398         case IIO_LIGHT:
 399                 if (val == 80000)
 400                         int_time = CM36651_CS_IT1;
 401                 else if (val == 160000)
 402                         int_time = CM36651_CS_IT2;
 403                 else if (val == 320000)
 404                         int_time = CM36651_CS_IT3;
 405                 else if (val == 640000)
 406                         int_time = CM36651_CS_IT4;
 407                 else
 408                         return -EINVAL;
 409
 410                 ret = i2c_smbus_write_byte_data(client, CM36651_CS_CONF3,
 411                                            int_time >> 2 * (chan->address));
 412                 if (ret < 0) {
 413                         dev_err(&client->dev, "CS integration time write failed\n");
 414                         return ret;
 415                 }
 416                 cm36651->cs_int_time[chan->address] = int_time;
 417                 break;
 418         case IIO_PROXIMITY:
 419                 if (val == 320)
 420                         int_time = CM36651_PS_IT1;
 421                 else if (val == 420)
 422                         int_time = CM36651_PS_IT2;
 423                 else if (val == 520)
 424                         int_time = CM36651_PS_IT3;
 425                 else if (val == 640)
 426                         int_time = CM36651_PS_IT4;
 427                 else
 428                         return -EINVAL;
 429
 430                 ret = i2c_smbus_write_byte_data(ps_client,
 431                                                 CM36651_PS_CONF1, int_time);
 432                 if (ret < 0) {
 433                         dev_err(&client->dev, "PS integration time write failed\n");
 434                         return ret;
 435                 }
 436                 cm36651->ps_int_time = int_time;
 437                 break;
 438         default:
 439                 return -EINVAL;
 440         }
 441
 442         return ret;
 443 }
 444
 445 static int cm36651_read_raw(struct iio_dev *indio_dev,
 446                             struct iio_chan_spec const *chan,
 447                             int *val, int *val2, long mask)
 448 {
 449         struct cm36651_data *cm36651 = iio_priv(indio_dev);
 450         int ret;
 451
 452         mutex_lock(&cm36651->lock);
 453
 454         switch (mask) {
 455         case IIO_CHAN_INFO_RAW:
 456                 ret = cm36651_read_channel(cm36651, chan, val);
 457                 break;
 458         case IIO_CHAN_INFO_INT_TIME:
 459                 *val = 0;
 460                 ret = cm36651_read_int_time(cm36651, chan, val2);
 461                 break;
 462         default:
 463                 ret = -EINVAL;
 464         }
 465
 466         mutex_unlock(&cm36651->lock);
 467
 468         return ret;
 469 }
 470
 471 static int cm36651_write_raw(struct iio_dev *indio_dev,
 472                              struct iio_chan_spec const *chan,
 473                              int val, int val2, long mask)
 474 {
 475         struct cm36651_data *cm36651 = iio_priv(indio_dev);
 476         struct i2c_client *client = cm36651->client;
 477         int ret = -EINVAL;
 478
 479         if (mask == IIO_CHAN_INFO_INT_TIME) {
 480                 ret = cm36651_write_int_time(cm36651, chan, val2);
 481                 if (ret < 0)
 482                         dev_err(&client->dev, "Integration time write failed\n");
 483         }
 484
 485         return ret;
 486 }
 487
 488 static int cm36651_read_prox_thresh(struct iio_dev *indio_dev,
 489                                         const struct iio_chan_spec *chan,
 490                                         enum iio_event_type type,
 491                                         enum iio_event_direction dir,
 492                                         enum iio_event_info info,
 493                                         int *val, int *val2)
 494 {
 495         struct cm36651_data *cm36651 = iio_priv(indio_dev);
 496
 497         *val = cm36651->ps_ctrl_regs[CM36651_PS_THD];
 498
 499         return 0;
 500 }
 501
 502 static int cm36651_write_prox_thresh(struct iio_dev *indio_dev,
 503                                         const struct iio_chan_spec *chan,
 504                                         enum iio_event_type type,
 505                                         enum iio_event_direction dir,
 506                                         enum iio_event_info info,
 507                                         int val, int val2)
 508 {
 509         struct cm36651_data *cm36651 = iio_priv(indio_dev);
 510         struct i2c_client *client = cm36651->client;
 511         int ret;
 512
 513         if (val < 3 || val > 255)
 514                 return -EINVAL;
 515
 516         cm36651->ps_ctrl_regs[CM36651_PS_THD] = val;
 517         ret = i2c_smbus_write_byte_data(cm36651->ps_client, CM36651_PS_THD,
 518                                         cm36651->ps_ctrl_regs[CM36651_PS_THD]);
 519
 520         if (ret < 0) {
 521                 dev_err(&client->dev, "PS threshold write failed: %d\n", ret);
 522                 return ret;
 523         }
 524
 525         return 0;
 526 }
 527
 528 static int cm36651_write_prox_event_config(struct iio_dev *indio_dev,
 529                                         const struct iio_chan_spec *chan,
 530                                         enum iio_event_type type,
 531                                         enum iio_event_direction dir,
 532                                         int state)
 533 {
 534         struct cm36651_data *cm36651 = iio_priv(indio_dev);
 535         int cmd, ret;
 536
 537         mutex_lock(&cm36651->lock);
 538
 539         cmd = state ? CM36651_CMD_PROX_EV_EN : CM36651_CMD_PROX_EV_DIS;
 540         ret = cm36651_set_operation_mode(cm36651, cmd);
 541
 542         mutex_unlock(&cm36651->lock);
 543
 544         return ret;
 545 }
 546
 547 static int cm36651_read_prox_event_config(struct iio_dev *indio_dev,
 548                                         const struct iio_chan_spec *chan,
 549                                         enum iio_event_type type,
 550                                         enum iio_event_direction dir)
 551 {
 552         struct cm36651_data *cm36651 = iio_priv(indio_dev);
 553         int event_en;
 554
 555         mutex_lock(&cm36651->lock);
 556
 557         event_en = test_bit(CM36651_PROXIMITY_EV_EN, &cm36651->flags);
 558
 559         mutex_unlock(&cm36651->lock);
 560
 561         return event_en;
 562 }
 563
 564 #define CM36651_LIGHT_CHANNEL(_color, _idx) {           \
 565         .type = IIO_LIGHT,                              \
 566         .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |  \
 567                         BIT(IIO_CHAN_INFO_INT_TIME),    \
 568         .address = _idx,                                \
 569         .modified = 1,                                  \
 570         .channel2 = IIO_MOD_LIGHT_##_color,             \
 571 }                                                       \
 572
 573 static const struct iio_event_spec cm36651_event_spec[] = {
 574         {
 575                 .type = IIO_EV_TYPE_THRESH,
 576                 .dir = IIO_EV_DIR_EITHER,
 577                 .mask_separate = BIT(IIO_EV_INFO_VALUE) |
 578                                 BIT(IIO_EV_INFO_ENABLE),
 579         }
 580 };
 581
 582 static const struct iio_chan_spec cm36651_channels[] = {
 583         {
 584                 .type = IIO_PROXIMITY,
 585                 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
 586                                 BIT(IIO_CHAN_INFO_INT_TIME),
 587                 .event_spec = cm36651_event_spec,
 588                 .num_event_specs = ARRAY_SIZE(cm36651_event_spec),
 589         },
 590         CM36651_LIGHT_CHANNEL(RED, CM36651_LIGHT_CHANNEL_IDX_RED),
 591         CM36651_LIGHT_CHANNEL(GREEN, CM36651_LIGHT_CHANNEL_IDX_GREEN),
 592         CM36651_LIGHT_CHANNEL(BLUE, CM36651_LIGHT_CHANNEL_IDX_BLUE),
 593         CM36651_LIGHT_CHANNEL(CLEAR, CM36651_LIGHT_CHANNEL_IDX_CLEAR),
 594 };
 595
 596 static IIO_CONST_ATTR(in_illuminance_integration_time_available,
 597                                         CM36651_CS_INT_TIME_AVAIL);
 598 static IIO_CONST_ATTR(in_proximity_integration_time_available,
 599                                         CM36651_PS_INT_TIME_AVAIL);
 600
 601 static struct attribute *cm36651_attributes[] = {
 602         &iio_const_attr_in_illuminance_integration_time_available.dev_attr.attr,
 603         &iio_const_attr_in_proximity_integration_time_available.dev_attr.attr,
 604         NULL,
 605 };
 606
 607 static const struct attribute_group cm36651_attribute_group = {
 608         .attrs = cm36651_attributes
 609 };
 610
 611 static const struct iio_info cm36651_info = {
 612         .read_raw               = &cm36651_read_raw,
 613         .write_raw              = &cm36651_write_raw,
 614         .read_event_value       = &cm36651_read_prox_thresh,
 615         .write_event_value      = &cm36651_write_prox_thresh,
 616         .read_event_config      = &cm36651_read_prox_event_config,
 617         .write_event_config     = &cm36651_write_prox_event_config,
 618         .attrs                  = &cm36651_attribute_group,
 619 };
 620
 621 static int cm36651_probe(struct i2c_client *client,
 622                              const struct i2c_device_id *id)
 623 {
 624         struct cm36651_data *cm36651;
 625         struct iio_dev *indio_dev;
 626         int ret;
 627
 628         indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*cm36651));
 629         if (!indio_dev)
 630                 return -ENOMEM;
 631
 632         cm36651 = iio_priv(indio_dev);
 633
 634         cm36651->vled_reg = devm_regulator_get(&client->dev, "vled");
 635         if (IS_ERR(cm36651->vled_reg)) {
 636                 dev_err(&client->dev, "get regulator vled failed\n");
 637                 return PTR_ERR(cm36651->vled_reg);
 638         }
 639
 640         ret = regulator_enable(cm36651->vled_reg);
 641         if (ret) {
 642                 dev_err(&client->dev, "enable regulator vled failed\n");
 643                 return ret;
 644         }
 645
 646         i2c_set_clientdata(client, indio_dev);
 647
 648         cm36651->client = client;
 649         cm36651->ps_client = i2c_new_dummy_device(client->adapter,
 650                                                      CM36651_I2C_ADDR_PS);
 651         if (IS_ERR(cm36651->ps_client)) {
 652                 dev_err(&client->dev, "%s: new i2c device failed\n", __func__);
 653                 ret = PTR_ERR(cm36651->ps_client);
 654                 goto error_disable_reg;
 655         }
 656
 657         cm36651->ara_client = i2c_new_dummy_device(client->adapter, CM36651_ARA);
 658         if (IS_ERR(cm36651->ara_client)) {
 659                 dev_err(&client->dev, "%s: new i2c device failed\n", __func__);
 660                 ret = PTR_ERR(cm36651->ara_client);
 661                 goto error_i2c_unregister_ps;
 662         }
 663
 664         mutex_init(&cm36651->lock);
 665         indio_dev->channels = cm36651_channels;
 666         indio_dev->num_channels = ARRAY_SIZE(cm36651_channels);
 667         indio_dev->info = &cm36651_info;
 668         indio_dev->name = id->name;
 669         indio_dev->modes = INDIO_DIRECT_MODE;
 670
 671         ret = cm36651_setup_reg(cm36651);
 672         if (ret) {
 673                 dev_err(&client->dev, "%s: register setup failed\n", __func__);
 674                 goto error_i2c_unregister_ara;
 675         }
 676
 677         ret = request_threaded_irq(client->irq, NULL, cm36651_irq_handler,
 678                                         IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
 679                                                         "cm36651", indio_dev);
 680         if (ret) {
 681                 dev_err(&client->dev, "%s: request irq failed\n", __func__);
 682                 goto error_i2c_unregister_ara;
 683         }
 684
 685         ret = iio_device_register(indio_dev);
 686         if (ret) {
 687                 dev_err(&client->dev, "%s: regist device failed\n", __func__);
 688                 goto error_free_irq;
 689         }
 690
 691         return 0;
 692
 693 error_free_irq:
 694         free_irq(client->irq, indio_dev);
 695 error_i2c_unregister_ara:
 696         i2c_unregister_device(cm36651->ara_client);
 697 error_i2c_unregister_ps:
 698         i2c_unregister_device(cm36651->ps_client);
 699 error_disable_reg:
 700         regulator_disable(cm36651->vled_reg);
 701         return ret;
 702 }
 703
 704 static int cm36651_remove(struct i2c_client *client)
 705 {
 706         struct iio_dev *indio_dev = i2c_get_clientdata(client);
 707         struct cm36651_data *cm36651 = iio_priv(indio_dev);
 708
 709         iio_device_unregister(indio_dev);
 710         regulator_disable(cm36651->vled_reg);
 711         free_irq(client->irq, indio_dev);
 712         i2c_unregister_device(cm36651->ps_client);
 713         i2c_unregister_device(cm36651->ara_client);
 714
 715         return 0;
 716 }
 717
 718 static const struct i2c_device_id cm36651_id[] = {
 719         { "cm36651", 0 },
 720         { }
 721 };
 722
 723 MODULE_DEVICE_TABLE(i2c, cm36651_id);
 724
 725 static const struct of_device_id cm36651_of_match[] = {
 726         { .compatible = "capella,cm36651" },
 727         { }
 728 };
 729 MODULE_DEVICE_TABLE(of, cm36651_of_match);
 730
 731 static struct i2c_driver cm36651_driver = {
 732         .driver = {
 733                 .name   = "cm36651",
 734                 .of_match_table = cm36651_of_match,
 735         },
 736         .probe          = cm36651_probe,
 737         .remove         = cm36651_remove,
 738         .id_table       = cm36651_id,
 739 };
 740
 741 module_i2c_driver(cm36651_driver);
 742
 743 MODULE_AUTHOR("Beomho Seo <beomho.seo@samsung.com>");
 744 MODULE_DESCRIPTION("CM36651 proximity/ambient light sensor driver");
 745 MODULE_LICENSE("GPL v2");