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