drivers/iio/light/stk3310.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Sensortek STK3310/STK3311 Ambient Light and Proximity Sensor
   4  *
   5  * Copyright (c) 2015, Intel Corporation.
   6  *
   7  * IIO driver for STK3310/STK3311. 7-bit I2C address: 0x48.
   8  */
   9
  10 #include <linux/i2c.h>
  11 #include <linux/interrupt.h>
  12 #include <linux/kernel.h>
  13 #include <linux/module.h>
  14 #include <linux/mod_devicetable.h>
  15 #include <linux/regmap.h>
  16 #include <linux/iio/events.h>
  17 #include <linux/iio/iio.h>
  18 #include <linux/iio/sysfs.h>
  19
  20 #define STK3310_REG_STATE                       0x00
  21 #define STK3310_REG_PSCTRL                      0x01
  22 #define STK3310_REG_ALSCTRL                     0x02
  23 #define STK3310_REG_INT                         0x04
  24 #define STK3310_REG_THDH_PS                     0x06
  25 #define STK3310_REG_THDL_PS                     0x08
  26 #define STK3310_REG_FLAG                        0x10
  27 #define STK3310_REG_PS_DATA_MSB                 0x11
  28 #define STK3310_REG_PS_DATA_LSB                 0x12
  29 #define STK3310_REG_ALS_DATA_MSB                0x13
  30 #define STK3310_REG_ALS_DATA_LSB                0x14
  31 #define STK3310_REG_ID                          0x3E
  32 #define STK3310_MAX_REG                         0x80
  33
  34 #define STK3310_STATE_EN_PS                     BIT(0)
  35 #define STK3310_STATE_EN_ALS                    BIT(1)
  36 #define STK3310_STATE_STANDBY                   0x00
  37
  38 #define STK3013_CHIP_ID_VAL                     0x31
  39 #define STK3310_CHIP_ID_VAL                     0x13
  40 #define STK3311_CHIP_ID_VAL                     0x1D
  41 #define STK3311A_CHIP_ID_VAL                    0x15
  42 #define STK3311S34_CHIP_ID_VAL                  0x1E
  43 #define STK3311X_CHIP_ID_VAL                    0x12
  44 #define STK3335_CHIP_ID_VAL                     0x51
  45 #define STK3310_PSINT_EN                        0x01
  46 #define STK3310_PS_MAX_VAL                      0xFFFF
  47
  48 #define STK3310_DRIVER_NAME                     "stk3310"
  49 #define STK3310_REGMAP_NAME                     "stk3310_regmap"
  50 #define STK3310_EVENT                           "stk3310_event"
  51
  52 #define STK3310_SCALE_AVAILABLE                 "6.4 1.6 0.4 0.1"
  53
  54 #define STK3310_IT_AVAILABLE \
  55         "0.000185 0.000370 0.000741 0.001480 0.002960 0.005920 0.011840 " \
  56         "0.023680 0.047360 0.094720 0.189440 0.378880 0.757760 1.515520 " \
  57         "3.031040 6.062080"
  58
  59 #define STK3310_REGFIELD(name)                                              \
  60         do {                                                                \
  61                 data->reg_##name =                                          \
  62                         devm_regmap_field_alloc(&client->dev, regmap,       \
  63                                 stk3310_reg_field_##name);                  \
  64                 if (IS_ERR(data->reg_##name)) {                             \
  65                         dev_err(&client->dev, "reg field alloc failed.\n"); \
  66                         return PTR_ERR(data->reg_##name);                   \
  67                 }                                                           \
  68         } while (0)
  69
  70 static const struct reg_field stk3310_reg_field_state =
  71                                 REG_FIELD(STK3310_REG_STATE, 0, 2);
  72 static const struct reg_field stk3310_reg_field_als_gain =
  73                                 REG_FIELD(STK3310_REG_ALSCTRL, 4, 5);
  74 static const struct reg_field stk3310_reg_field_ps_gain =
  75                                 REG_FIELD(STK3310_REG_PSCTRL, 4, 5);
  76 static const struct reg_field stk3310_reg_field_als_it =
  77                                 REG_FIELD(STK3310_REG_ALSCTRL, 0, 3);
  78 static const struct reg_field stk3310_reg_field_ps_it =
  79                                 REG_FIELD(STK3310_REG_PSCTRL, 0, 3);
  80 static const struct reg_field stk3310_reg_field_int_ps =
  81                                 REG_FIELD(STK3310_REG_INT, 0, 2);
  82 static const struct reg_field stk3310_reg_field_flag_psint =
  83                                 REG_FIELD(STK3310_REG_FLAG, 4, 4);
  84 static const struct reg_field stk3310_reg_field_flag_nf =
  85                                 REG_FIELD(STK3310_REG_FLAG, 0, 0);
  86
  87 static const u8 stk3310_chip_ids[] = {
  88         STK3013_CHIP_ID_VAL,
  89         STK3310_CHIP_ID_VAL,
  90         STK3311A_CHIP_ID_VAL,
  91         STK3311S34_CHIP_ID_VAL,
  92         STK3311X_CHIP_ID_VAL,
  93         STK3311_CHIP_ID_VAL,
  94         STK3335_CHIP_ID_VAL,
  95 };
  96
  97 /* Estimate maximum proximity values with regard to measurement scale. */
  98 static const int stk3310_ps_max[4] = {
  99         STK3310_PS_MAX_VAL / 640,
 100         STK3310_PS_MAX_VAL / 160,
 101         STK3310_PS_MAX_VAL /  40,
 102         STK3310_PS_MAX_VAL /  10
 103 };
 104
 105 static const int stk3310_scale_table[][2] = {
 106         {6, 400000}, {1, 600000}, {0, 400000}, {0, 100000}
 107 };
 108
 109 /* Integration time in seconds, microseconds */
 110 static const int stk3310_it_table[][2] = {
 111         {0, 185},       {0, 370},       {0, 741},       {0, 1480},
 112         {0, 2960},      {0, 5920},      {0, 11840},     {0, 23680},
 113         {0, 47360},     {0, 94720},     {0, 189440},    {0, 378880},
 114         {0, 757760},    {1, 515520},    {3, 31040},     {6, 62080},
 115 };
 116
 117 struct stk3310_data {
 118         struct i2c_client *client;
 119         struct mutex lock;
 120         bool als_enabled;
 121         bool ps_enabled;
 122         uint32_t ps_near_level;
 123         u64 timestamp;
 124         struct regmap *regmap;
 125         struct regmap_field *reg_state;
 126         struct regmap_field *reg_als_gain;
 127         struct regmap_field *reg_ps_gain;
 128         struct regmap_field *reg_als_it;
 129         struct regmap_field *reg_ps_it;
 130         struct regmap_field *reg_int_ps;
 131         struct regmap_field *reg_flag_psint;
 132         struct regmap_field *reg_flag_nf;
 133 };
 134
 135 static const struct iio_event_spec stk3310_events[] = {
 136         /* Proximity event */
 137         {
 138                 .type = IIO_EV_TYPE_THRESH,
 139                 .dir = IIO_EV_DIR_RISING,
 140                 .mask_separate = BIT(IIO_EV_INFO_VALUE) |
 141                                  BIT(IIO_EV_INFO_ENABLE),
 142         },
 143         /* Out-of-proximity event */
 144         {
 145                 .type = IIO_EV_TYPE_THRESH,
 146                 .dir = IIO_EV_DIR_FALLING,
 147                 .mask_separate = BIT(IIO_EV_INFO_VALUE) |
 148                                  BIT(IIO_EV_INFO_ENABLE),
 149         },
 150 };
 151
 152 static ssize_t stk3310_read_near_level(struct iio_dev *indio_dev,
 153                                        uintptr_t priv,
 154                                        const struct iio_chan_spec *chan,
 155                                        char *buf)
 156 {
 157         struct stk3310_data *data = iio_priv(indio_dev);
 158
 159         return sprintf(buf, "%u\n", data->ps_near_level);
 160 }
 161
 162 static const struct iio_chan_spec_ext_info stk3310_ext_info[] = {
 163         {
 164                 .name = "nearlevel",
 165                 .shared = IIO_SEPARATE,
 166                 .read = stk3310_read_near_level,
 167         },
 168         { /* sentinel */ }
 169 };
 170
 171 static const struct iio_chan_spec stk3310_channels[] = {
 172         {
 173                 .type = IIO_LIGHT,
 174                 .info_mask_separate =
 175                         BIT(IIO_CHAN_INFO_RAW) |
 176                         BIT(IIO_CHAN_INFO_SCALE) |
 177                         BIT(IIO_CHAN_INFO_INT_TIME),
 178         },
 179         {
 180                 .type = IIO_PROXIMITY,
 181                 .info_mask_separate =
 182                         BIT(IIO_CHAN_INFO_RAW) |
 183                         BIT(IIO_CHAN_INFO_SCALE) |
 184                         BIT(IIO_CHAN_INFO_INT_TIME),
 185                 .event_spec = stk3310_events,
 186                 .num_event_specs = ARRAY_SIZE(stk3310_events),
 187                 .ext_info = stk3310_ext_info,
 188         }
 189 };
 190
 191 static IIO_CONST_ATTR(in_illuminance_scale_available, STK3310_SCALE_AVAILABLE);
 192
 193 static IIO_CONST_ATTR(in_proximity_scale_available, STK3310_SCALE_AVAILABLE);
 194
 195 static IIO_CONST_ATTR(in_illuminance_integration_time_available,
 196                       STK3310_IT_AVAILABLE);
 197
 198 static IIO_CONST_ATTR(in_proximity_integration_time_available,
 199                       STK3310_IT_AVAILABLE);
 200
 201 static struct attribute *stk3310_attributes[] = {
 202         &iio_const_attr_in_illuminance_scale_available.dev_attr.attr,
 203         &iio_const_attr_in_proximity_scale_available.dev_attr.attr,
 204         &iio_const_attr_in_illuminance_integration_time_available.dev_attr.attr,
 205         &iio_const_attr_in_proximity_integration_time_available.dev_attr.attr,
 206         NULL,
 207 };
 208
 209 static const struct attribute_group stk3310_attribute_group = {
 210         .attrs = stk3310_attributes
 211 };
 212
 213 static int stk3310_check_chip_id(const u8 chip_id)
 214 {
 215         for (int i = 0; i < ARRAY_SIZE(stk3310_chip_ids); i++) {
 216                 if (chip_id == stk3310_chip_ids[i])
 217                         return 0;
 218         }
 219
 220         return -ENODEV;
 221 }
 222
 223 static int stk3310_get_index(const int table[][2], int table_size,
 224                              int val, int val2)
 225 {
 226         int i;
 227
 228         for (i = 0; i < table_size; i++) {
 229                 if (val == table[i][0] && val2 == table[i][1])
 230                         return i;
 231         }
 232
 233         return -EINVAL;
 234 }
 235
 236 static int stk3310_read_event(struct iio_dev *indio_dev,
 237                               const struct iio_chan_spec *chan,
 238                               enum iio_event_type type,
 239                               enum iio_event_direction dir,
 240                               enum iio_event_info info,
 241                               int *val, int *val2)
 242 {
 243         u8 reg;
 244         __be16 buf;
 245         int ret;
 246         struct stk3310_data *data = iio_priv(indio_dev);
 247
 248         if (info != IIO_EV_INFO_VALUE)
 249                 return -EINVAL;
 250
 251         /* Only proximity interrupts are implemented at the moment. */
 252         if (dir == IIO_EV_DIR_RISING)
 253                 reg = STK3310_REG_THDH_PS;
 254         else if (dir == IIO_EV_DIR_FALLING)
 255                 reg = STK3310_REG_THDL_PS;
 256         else
 257                 return -EINVAL;
 258
 259         mutex_lock(&data->lock);
 260         ret = regmap_bulk_read(data->regmap, reg, &buf, 2);
 261         mutex_unlock(&data->lock);
 262         if (ret < 0) {
 263                 dev_err(&data->client->dev, "register read failed\n");
 264                 return ret;
 265         }
 266         *val = be16_to_cpu(buf);
 267
 268         return IIO_VAL_INT;
 269 }
 270
 271 static int stk3310_write_event(struct iio_dev *indio_dev,
 272                                const struct iio_chan_spec *chan,
 273                                enum iio_event_type type,
 274                                enum iio_event_direction dir,
 275                                enum iio_event_info info,
 276                                int val, int val2)
 277 {
 278         u8 reg;
 279         __be16 buf;
 280         int ret;
 281         unsigned int index;
 282         struct stk3310_data *data = iio_priv(indio_dev);
 283         struct i2c_client *client = data->client;
 284
 285         ret = regmap_field_read(data->reg_ps_gain, &index);
 286         if (ret < 0)
 287                 return ret;
 288
 289         if (val < 0 || val > stk3310_ps_max[index])
 290                 return -EINVAL;
 291
 292         if (dir == IIO_EV_DIR_RISING)
 293                 reg = STK3310_REG_THDH_PS;
 294         else if (dir == IIO_EV_DIR_FALLING)
 295                 reg = STK3310_REG_THDL_PS;
 296         else
 297                 return -EINVAL;
 298
 299         buf = cpu_to_be16(val);
 300         ret = regmap_bulk_write(data->regmap, reg, &buf, 2);
 301         if (ret < 0)
 302                 dev_err(&client->dev, "failed to set PS threshold!\n");
 303
 304         return ret;
 305 }
 306
 307 static int stk3310_read_event_config(struct iio_dev *indio_dev,
 308                                      const struct iio_chan_spec *chan,
 309                                      enum iio_event_type type,
 310                                      enum iio_event_direction dir)
 311 {
 312         unsigned int event_val;
 313         int ret;
 314         struct stk3310_data *data = iio_priv(indio_dev);
 315
 316         ret = regmap_field_read(data->reg_int_ps, &event_val);
 317         if (ret < 0)
 318                 return ret;
 319
 320         return event_val;
 321 }
 322
 323 static int stk3310_write_event_config(struct iio_dev *indio_dev,
 324                                       const struct iio_chan_spec *chan,
 325                                       enum iio_event_type type,
 326                                       enum iio_event_direction dir,
 327                                       bool state)
 328 {
 329         int ret;
 330         struct stk3310_data *data = iio_priv(indio_dev);
 331         struct i2c_client *client = data->client;
 332
 333         /* Set INT_PS value */
 334         mutex_lock(&data->lock);
 335         ret = regmap_field_write(data->reg_int_ps, state);
 336         if (ret < 0)
 337                 dev_err(&client->dev, "failed to set interrupt mode\n");
 338         mutex_unlock(&data->lock);
 339
 340         return ret;
 341 }
 342
 343 static int stk3310_read_raw(struct iio_dev *indio_dev,
 344                             struct iio_chan_spec const *chan,
 345                             int *val, int *val2, long mask)
 346 {
 347         u8 reg;
 348         __be16 buf;
 349         int ret;
 350         unsigned int index;
 351         struct stk3310_data *data = iio_priv(indio_dev);
 352         struct i2c_client *client = data->client;
 353
 354         if (chan->type != IIO_LIGHT && chan->type != IIO_PROXIMITY)
 355                 return -EINVAL;
 356
 357         switch (mask) {
 358         case IIO_CHAN_INFO_RAW:
 359                 if (chan->type == IIO_LIGHT)
 360                         reg = STK3310_REG_ALS_DATA_MSB;
 361                 else
 362                         reg = STK3310_REG_PS_DATA_MSB;
 363
 364                 mutex_lock(&data->lock);
 365                 ret = regmap_bulk_read(data->regmap, reg, &buf, 2);
 366                 if (ret < 0) {
 367                         dev_err(&client->dev, "register read failed\n");
 368                         mutex_unlock(&data->lock);
 369                         return ret;
 370                 }
 371                 *val = be16_to_cpu(buf);
 372                 mutex_unlock(&data->lock);
 373                 return IIO_VAL_INT;
 374         case IIO_CHAN_INFO_INT_TIME:
 375                 if (chan->type == IIO_LIGHT)
 376                         ret = regmap_field_read(data->reg_als_it, &index);
 377                 else
 378                         ret = regmap_field_read(data->reg_ps_it, &index);
 379                 if (ret < 0)
 380                         return ret;
 381
 382                 *val = stk3310_it_table[index][0];
 383                 *val2 = stk3310_it_table[index][1];
 384                 return IIO_VAL_INT_PLUS_MICRO;
 385         case IIO_CHAN_INFO_SCALE:
 386                 if (chan->type == IIO_LIGHT)
 387                         ret = regmap_field_read(data->reg_als_gain, &index);
 388                 else
 389                         ret = regmap_field_read(data->reg_ps_gain, &index);
 390                 if (ret < 0)
 391                         return ret;
 392
 393                 *val = stk3310_scale_table[index][0];
 394                 *val2 = stk3310_scale_table[index][1];
 395                 return IIO_VAL_INT_PLUS_MICRO;
 396         }
 397
 398         return -EINVAL;
 399 }
 400
 401 static int stk3310_write_raw(struct iio_dev *indio_dev,
 402                              struct iio_chan_spec const *chan,
 403                              int val, int val2, long mask)
 404 {
 405         int ret;
 406         int index;
 407         struct stk3310_data *data = iio_priv(indio_dev);
 408
 409         if (chan->type != IIO_LIGHT && chan->type != IIO_PROXIMITY)
 410                 return -EINVAL;
 411
 412         switch (mask) {
 413         case IIO_CHAN_INFO_INT_TIME:
 414                 index = stk3310_get_index(stk3310_it_table,
 415                                           ARRAY_SIZE(stk3310_it_table),
 416                                           val, val2);
 417                 if (index < 0)
 418                         return -EINVAL;
 419                 mutex_lock(&data->lock);
 420                 if (chan->type == IIO_LIGHT)
 421                         ret = regmap_field_write(data->reg_als_it, index);
 422                 else
 423                         ret = regmap_field_write(data->reg_ps_it, index);
 424                 if (ret < 0)
 425                         dev_err(&data->client->dev,
 426                                 "sensor configuration failed\n");
 427                 mutex_unlock(&data->lock);
 428                 return ret;
 429
 430         case IIO_CHAN_INFO_SCALE:
 431                 index = stk3310_get_index(stk3310_scale_table,
 432                                           ARRAY_SIZE(stk3310_scale_table),
 433                                           val, val2);
 434                 if (index < 0)
 435                         return -EINVAL;
 436                 mutex_lock(&data->lock);
 437                 if (chan->type == IIO_LIGHT)
 438                         ret = regmap_field_write(data->reg_als_gain, index);
 439                 else
 440                         ret = regmap_field_write(data->reg_ps_gain, index);
 441                 if (ret < 0)
 442                         dev_err(&data->client->dev,
 443                                 "sensor configuration failed\n");
 444                 mutex_unlock(&data->lock);
 445                 return ret;
 446         }
 447
 448         return -EINVAL;
 449 }
 450
 451 static const struct iio_info stk3310_info = {
 452         .read_raw               = stk3310_read_raw,
 453         .write_raw              = stk3310_write_raw,
 454         .attrs                  = &stk3310_attribute_group,
 455         .read_event_value       = stk3310_read_event,
 456         .write_event_value      = stk3310_write_event,
 457         .read_event_config      = stk3310_read_event_config,
 458         .write_event_config     = stk3310_write_event_config,
 459 };
 460
 461 static int stk3310_set_state(struct stk3310_data *data, u8 state)
 462 {
 463         int ret;
 464         struct i2c_client *client = data->client;
 465
 466         /* 3-bit state; 0b100 is not supported. */
 467         if (state > 7 || state == 4)
 468                 return -EINVAL;
 469
 470         mutex_lock(&data->lock);
 471         ret = regmap_field_write(data->reg_state, state);
 472         if (ret < 0) {
 473                 dev_err(&client->dev, "failed to change sensor state\n");
 474         } else if (state != STK3310_STATE_STANDBY) {
 475                 /* Don't reset the 'enabled' flags if we're going in standby */
 476                 data->ps_enabled  = !!(state & STK3310_STATE_EN_PS);
 477                 data->als_enabled = !!(state & STK3310_STATE_EN_ALS);
 478         }
 479         mutex_unlock(&data->lock);
 480
 481         return ret;
 482 }
 483
 484 static int stk3310_init(struct iio_dev *indio_dev)
 485 {
 486         int ret;
 487         int chipid;
 488         u8 state;
 489         struct stk3310_data *data = iio_priv(indio_dev);
 490         struct i2c_client *client = data->client;
 491
 492         ret = regmap_read(data->regmap, STK3310_REG_ID, &chipid);
 493         if (ret < 0)
 494                 return ret;
 495
 496         ret = stk3310_check_chip_id(chipid);
 497         if (ret < 0)
 498                 dev_info(&client->dev, "new unknown chip id: 0x%x\n", chipid);
 499
 500         state = STK3310_STATE_EN_ALS | STK3310_STATE_EN_PS;
 501         ret = stk3310_set_state(data, state);
 502         if (ret < 0) {
 503                 dev_err(&client->dev, "failed to enable sensor");
 504                 return ret;
 505         }
 506
 507         /* Enable PS interrupts */
 508         ret = regmap_field_write(data->reg_int_ps, STK3310_PSINT_EN);
 509         if (ret < 0)
 510                 dev_err(&client->dev, "failed to enable interrupts!\n");
 511
 512         return ret;
 513 }
 514
 515 static bool stk3310_is_volatile_reg(struct device *dev, unsigned int reg)
 516 {
 517         switch (reg) {
 518         case STK3310_REG_ALS_DATA_MSB:
 519         case STK3310_REG_ALS_DATA_LSB:
 520         case STK3310_REG_PS_DATA_LSB:
 521         case STK3310_REG_PS_DATA_MSB:
 522         case STK3310_REG_FLAG:
 523                 return true;
 524         default:
 525                 return false;
 526         }
 527 }
 528
 529 static const struct regmap_config stk3310_regmap_config = {
 530         .name = STK3310_REGMAP_NAME,
 531         .reg_bits = 8,
 532         .val_bits = 8,
 533         .max_register = STK3310_MAX_REG,
 534         .cache_type = REGCACHE_RBTREE,
 535         .volatile_reg = stk3310_is_volatile_reg,
 536 };
 537
 538 static int stk3310_regmap_init(struct stk3310_data *data)
 539 {
 540         struct regmap *regmap;
 541         struct i2c_client *client;
 542
 543         client = data->client;
 544         regmap = devm_regmap_init_i2c(client, &stk3310_regmap_config);
 545         if (IS_ERR(regmap)) {
 546                 dev_err(&client->dev, "regmap initialization failed.\n");
 547                 return PTR_ERR(regmap);
 548         }
 549         data->regmap = regmap;
 550
 551         STK3310_REGFIELD(state);
 552         STK3310_REGFIELD(als_gain);
 553         STK3310_REGFIELD(ps_gain);
 554         STK3310_REGFIELD(als_it);
 555         STK3310_REGFIELD(ps_it);
 556         STK3310_REGFIELD(int_ps);
 557         STK3310_REGFIELD(flag_psint);
 558         STK3310_REGFIELD(flag_nf);
 559
 560         return 0;
 561 }
 562
 563 static irqreturn_t stk3310_irq_handler(int irq, void *private)
 564 {
 565         struct iio_dev *indio_dev = private;
 566         struct stk3310_data *data = iio_priv(indio_dev);
 567
 568         data->timestamp = iio_get_time_ns(indio_dev);
 569
 570         return IRQ_WAKE_THREAD;
 571 }
 572
 573 static irqreturn_t stk3310_irq_event_handler(int irq, void *private)
 574 {
 575         int ret;
 576         unsigned int dir;
 577         u64 event;
 578
 579         struct iio_dev *indio_dev = private;
 580         struct stk3310_data *data = iio_priv(indio_dev);
 581
 582         /* Read FLAG_NF to figure out what threshold has been met. */
 583         mutex_lock(&data->lock);
 584         ret = regmap_field_read(data->reg_flag_nf, &dir);
 585         if (ret < 0) {
 586                 dev_err(&data->client->dev, "register read failed: %d\n", ret);
 587                 goto out;
 588         }
 589         event = IIO_UNMOD_EVENT_CODE(IIO_PROXIMITY, 1,
 590                                      IIO_EV_TYPE_THRESH,
 591                                      (dir ? IIO_EV_DIR_FALLING :
 592                                             IIO_EV_DIR_RISING));
 593         iio_push_event(indio_dev, event, data->timestamp);
 594
 595         /* Reset the interrupt flag */
 596         ret = regmap_field_write(data->reg_flag_psint, 0);
 597         if (ret < 0)
 598                 dev_err(&data->client->dev, "failed to reset interrupts\n");
 599 out:
 600         mutex_unlock(&data->lock);
 601
 602         return IRQ_HANDLED;
 603 }
 604
 605 static int stk3310_probe(struct i2c_client *client)
 606 {
 607         int ret;
 608         struct iio_dev *indio_dev;
 609         struct stk3310_data *data;
 610
 611         indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data));
 612         if (!indio_dev) {
 613                 dev_err(&client->dev, "iio allocation failed!\n");
 614                 return -ENOMEM;
 615         }
 616
 617         data = iio_priv(indio_dev);
 618         data->client = client;
 619         i2c_set_clientdata(client, indio_dev);
 620
 621         device_property_read_u32(&client->dev, "proximity-near-level",
 622                                  &data->ps_near_level);
 623
 624         mutex_init(&data->lock);
 625
 626         ret = stk3310_regmap_init(data);
 627         if (ret < 0)
 628                 return ret;
 629
 630         indio_dev->info = &stk3310_info;
 631         indio_dev->name = STK3310_DRIVER_NAME;
 632         indio_dev->modes = INDIO_DIRECT_MODE;
 633         indio_dev->channels = stk3310_channels;
 634         indio_dev->num_channels = ARRAY_SIZE(stk3310_channels);
 635
 636         ret = stk3310_init(indio_dev);
 637         if (ret < 0)
 638                 return ret;
 639
 640         if (client->irq > 0) {
 641                 ret = devm_request_threaded_irq(&client->dev, client->irq,
 642                                                 stk3310_irq_handler,
 643                                                 stk3310_irq_event_handler,
 644                                                 IRQF_TRIGGER_FALLING |
 645                                                 IRQF_ONESHOT,
 646                                                 STK3310_EVENT, indio_dev);
 647                 if (ret < 0) {
 648                         dev_err(&client->dev, "request irq %d failed\n",
 649                                 client->irq);
 650                         goto err_standby;
 651                 }
 652         }
 653
 654         ret = iio_device_register(indio_dev);
 655         if (ret < 0) {
 656                 dev_err(&client->dev, "device_register failed\n");
 657                 goto err_standby;
 658         }
 659
 660         return 0;
 661
 662 err_standby:
 663         stk3310_set_state(data, STK3310_STATE_STANDBY);
 664         return ret;
 665 }
 666
 667 static void stk3310_remove(struct i2c_client *client)
 668 {
 669         struct iio_dev *indio_dev = i2c_get_clientdata(client);
 670
 671         iio_device_unregister(indio_dev);
 672         stk3310_set_state(iio_priv(indio_dev), STK3310_STATE_STANDBY);
 673 }
 674
 675 static int stk3310_suspend(struct device *dev)
 676 {
 677         struct stk3310_data *data;
 678
 679         data = iio_priv(i2c_get_clientdata(to_i2c_client(dev)));
 680
 681         return stk3310_set_state(data, STK3310_STATE_STANDBY);
 682 }
 683
 684 static int stk3310_resume(struct device *dev)
 685 {
 686         u8 state = 0;
 687         struct stk3310_data *data;
 688
 689         data = iio_priv(i2c_get_clientdata(to_i2c_client(dev)));
 690         if (data->ps_enabled)
 691                 state |= STK3310_STATE_EN_PS;
 692         if (data->als_enabled)
 693                 state |= STK3310_STATE_EN_ALS;
 694
 695         return stk3310_set_state(data, state);
 696 }
 697
 698 static DEFINE_SIMPLE_DEV_PM_OPS(stk3310_pm_ops, stk3310_suspend,
 699                                 stk3310_resume);
 700
 701 static const struct i2c_device_id stk3310_i2c_id[] = {
 702         { "STK3013" },
 703         { "STK3310" },
 704         { "STK3311" },
 705         { "STK3335" },
 706         {}
 707 };
 708 MODULE_DEVICE_TABLE(i2c, stk3310_i2c_id);
 709
 710 static const struct acpi_device_id stk3310_acpi_id[] = {
 711         {"STK3013", 0},
 712         {"STK3310", 0},
 713         {"STK3311", 0},
 714         {}
 715 };
 716
 717 MODULE_DEVICE_TABLE(acpi, stk3310_acpi_id);
 718
 719 static const struct of_device_id stk3310_of_match[] = {
 720         { .compatible = "sensortek,stk3013", },
 721         { .compatible = "sensortek,stk3310", },
 722         { .compatible = "sensortek,stk3311", },
 723         { .compatible = "sensortek,stk3335", },
 724         {}
 725 };
 726 MODULE_DEVICE_TABLE(of, stk3310_of_match);
 727
 728 static struct i2c_driver stk3310_driver = {
 729         .driver = {
 730                 .name = "stk3310",
 731                 .of_match_table = stk3310_of_match,
 732                 .pm = pm_sleep_ptr(&stk3310_pm_ops),
 733                 .acpi_match_table = stk3310_acpi_id,
 734         },
 735         .probe =        stk3310_probe,
 736         .remove =           stk3310_remove,
 737         .id_table =         stk3310_i2c_id,
 738 };
 739
 740 module_i2c_driver(stk3310_driver);
 741
 742 MODULE_AUTHOR("Tiberiu Breana <[email protected]>");
 743 MODULE_DESCRIPTION("STK3310 Ambient Light and Proximity Sensor driver");
 744 MODULE_LICENSE("GPL v2");