drivers/iio/light/tsl2591.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * Copyright (C) 2021 Joe Sandom <joe.g.sandom@gmail.com>
   4  *
   5  * Datasheet: https://ams.com/tsl25911#tab/documents
   6  *
   7  * Device driver for the TAOS TSL2591. This is a very-high sensitivity
   8  * light-to-digital converter that transforms light intensity into a digital
   9  * signal.
  10  */
  11
  12 #include <linux/bitfield.h>
  13 #include <linux/debugfs.h>
  14 #include <linux/delay.h>
  15 #include <linux/i2c.h>
  16 #include <linux/interrupt.h>
  17 #include <linux/iopoll.h>
  18 #include <linux/kernel.h>
  19 #include <linux/module.h>
  20 #include <linux/mutex.h>
  21 #include <linux/pm_runtime.h>
  22 #include <linux/sysfs.h>
  23
  24 #include <asm/unaligned.h>
  25
  26 #include <linux/iio/events.h>
  27 #include <linux/iio/iio.h>
  28 #include <linux/iio/sysfs.h>
  29
  30 /* ADC integration time, field value to time in ms */
  31 #define TSL2591_FVAL_TO_MSEC(x) (((x) + 1) * 100)
  32 /* ADC integration time, field value to time in seconds */
  33 #define TSL2591_FVAL_TO_SEC(x) ((x) + 1)
  34 /* ADC integration time, time in seconds to field value */
  35 #define TSL2591_SEC_TO_FVAL(x) ((x) - 1)
  36
  37 /* TSL2591 register set */
  38 #define TSL2591_ENABLE      0x00
  39 #define TSL2591_CONTROL     0x01
  40 #define TSL2591_AILTL       0x04
  41 #define TSL2591_AILTH       0x05
  42 #define TSL2591_AIHTL       0x06
  43 #define TSL2591_AIHTH       0x07
  44 #define TSL2591_NP_AILTL    0x08
  45 #define TSL2591_NP_AILTH    0x09
  46 #define TSL2591_NP_AIHTL    0x0A
  47 #define TSL2591_NP_AIHTH    0x0B
  48 #define TSL2591_PERSIST     0x0C
  49 #define TSL2591_PACKAGE_ID  0x11
  50 #define TSL2591_DEVICE_ID   0x12
  51 #define TSL2591_STATUS      0x13
  52 #define TSL2591_C0_DATAL    0x14
  53 #define TSL2591_C0_DATAH    0x15
  54 #define TSL2591_C1_DATAL    0x16
  55 #define TSL2591_C1_DATAH    0x17
  56
  57 /* TSL2591 command register definitions */
  58 #define TSL2591_CMD_NOP             0xA0
  59 #define TSL2591_CMD_SF_INTSET       0xE4
  60 #define TSL2591_CMD_SF_CALS_I       0xE5
  61 #define TSL2591_CMD_SF_CALS_NPI     0xE7
  62 #define TSL2591_CMD_SF_CNP_ALSI     0xEA
  63
  64 /* TSL2591 enable register definitions */
  65 #define TSL2591_PWR_ON              0x01
  66 #define TSL2591_PWR_OFF             0x00
  67 #define TSL2591_ENABLE_ALS          0x02
  68 #define TSL2591_ENABLE_ALS_INT      0x10
  69 #define TSL2591_ENABLE_SLEEP_INT    0x40
  70 #define TSL2591_ENABLE_NP_INT       0x80
  71
  72 /* TSL2591 control register definitions */
  73 #define TSL2591_CTRL_ALS_INTEGRATION_100MS  0x00
  74 #define TSL2591_CTRL_ALS_INTEGRATION_200MS  0x01
  75 #define TSL2591_CTRL_ALS_INTEGRATION_300MS  0x02
  76 #define TSL2591_CTRL_ALS_INTEGRATION_400MS  0x03
  77 #define TSL2591_CTRL_ALS_INTEGRATION_500MS  0x04
  78 #define TSL2591_CTRL_ALS_INTEGRATION_600MS  0x05
  79 #define TSL2591_CTRL_ALS_LOW_GAIN           0x00
  80 #define TSL2591_CTRL_ALS_MED_GAIN           0x10
  81 #define TSL2591_CTRL_ALS_HIGH_GAIN          0x20
  82 #define TSL2591_CTRL_ALS_MAX_GAIN           0x30
  83 #define TSL2591_CTRL_SYS_RESET              0x80
  84
  85 /* TSL2591 persist register definitions */
  86 #define TSL2591_PRST_ALS_INT_CYCLE_0        0x00
  87 #define TSL2591_PRST_ALS_INT_CYCLE_ANY      0x01
  88 #define TSL2591_PRST_ALS_INT_CYCLE_2        0x02
  89 #define TSL2591_PRST_ALS_INT_CYCLE_3        0x03
  90 #define TSL2591_PRST_ALS_INT_CYCLE_5        0x04
  91 #define TSL2591_PRST_ALS_INT_CYCLE_10       0x05
  92 #define TSL2591_PRST_ALS_INT_CYCLE_15       0x06
  93 #define TSL2591_PRST_ALS_INT_CYCLE_20       0x07
  94 #define TSL2591_PRST_ALS_INT_CYCLE_25       0x08
  95 #define TSL2591_PRST_ALS_INT_CYCLE_30       0x09
  96 #define TSL2591_PRST_ALS_INT_CYCLE_35       0x0A
  97 #define TSL2591_PRST_ALS_INT_CYCLE_40       0x0B
  98 #define TSL2591_PRST_ALS_INT_CYCLE_45       0x0C
  99 #define TSL2591_PRST_ALS_INT_CYCLE_50       0x0D
 100 #define TSL2591_PRST_ALS_INT_CYCLE_55       0x0E
 101 #define TSL2591_PRST_ALS_INT_CYCLE_60       0x0F
 102 #define TSL2591_PRST_ALS_INT_CYCLE_MAX      (BIT(4) - 1)
 103
 104 /* TSL2591 PID register mask */
 105 #define TSL2591_PACKAGE_ID_MASK  GENMASK(5, 4)
 106
 107 /* TSL2591 ID register mask */
 108 #define TSL2591_DEVICE_ID_MASK   GENMASK(7, 0)
 109
 110 /* TSL2591 status register masks */
 111 #define TSL2591_STS_ALS_VALID_MASK   BIT(0)
 112 #define TSL2591_STS_ALS_INT_MASK     BIT(4)
 113 #define TSL2591_STS_NPERS_INT_MASK   BIT(5)
 114 #define TSL2591_STS_VAL_HIGH_MASK    BIT(0)
 115
 116 /* TSL2591 constant values */
 117 #define TSL2591_PACKAGE_ID_VAL  0x00
 118 #define TSL2591_DEVICE_ID_VAL   0x50
 119
 120 /* Power off suspend delay time MS */
 121 #define TSL2591_POWER_OFF_DELAY_MS   2000
 122
 123 /* TSL2591 default values */
 124 #define TSL2591_DEFAULT_ALS_INT_TIME          TSL2591_CTRL_ALS_INTEGRATION_300MS
 125 #define TSL2591_DEFAULT_ALS_GAIN              TSL2591_CTRL_ALS_MED_GAIN
 126 #define TSL2591_DEFAULT_ALS_PERSIST           TSL2591_PRST_ALS_INT_CYCLE_ANY
 127 #define TSL2591_DEFAULT_ALS_LOWER_THRESH      100
 128 #define TSL2591_DEFAULT_ALS_UPPER_THRESH      1500
 129
 130 /* TSL2591 number of data registers */
 131 #define TSL2591_NUM_DATA_REGISTERS     4
 132
 133 /* TSL2591 number of valid status reads on ADC complete */
 134 #define TSL2591_ALS_STS_VALID_COUNT    10
 135
 136 /* TSL2591 delay period between polls when checking for ALS valid flag */
 137 #define TSL2591_DELAY_PERIOD_US        10000
 138
 139 /* TSL2591 maximum values */
 140 #define TSL2591_MAX_ALS_INT_TIME_MS    600
 141 #define TSL2591_ALS_MAX_VALUE          (BIT(16) - 1)
 142
 143 /*
 144  * LUX calculations;
 145  * AGAIN values from Adafruit's TSL2591 Arduino library
 146  * https://github.com/adafruit/Adafruit_TSL2591_Library
 147  */
 148 #define TSL2591_CTRL_ALS_LOW_GAIN_MULTIPLIER   1
 149 #define TSL2591_CTRL_ALS_MED_GAIN_MULTIPLIER   25
 150 #define TSL2591_CTRL_ALS_HIGH_GAIN_MULTIPLIER  428
 151 #define TSL2591_CTRL_ALS_MAX_GAIN_MULTIPLIER   9876
 152 #define TSL2591_LUX_COEFFICIENT                408
 153
 154 struct tsl2591_als_settings {
 155         u16 als_lower_thresh;
 156         u16 als_upper_thresh;
 157         u8 als_int_time;
 158         u8 als_persist;
 159         u8 als_gain;
 160 };
 161
 162 struct tsl2591_chip {
 163         struct tsl2591_als_settings als_settings;
 164         struct i2c_client *client;
 165         /*
 166          * Keep als_settings in sync with hardware state
 167          * and ensure multiple readers are serialized.
 168          */
 169         struct mutex als_mutex;
 170         bool events_enabled;
 171 };
 172
 173 /*
 174  * Period table is ALS persist cycle x integration time setting
 175  * Integration times: 100ms, 200ms, 300ms, 400ms, 500ms, 600ms
 176  * ALS cycles: 1, 2, 3, 5, 10, 20, 25, 30, 35, 40, 45, 50, 55, 60
 177  */
 178 static const char * const tsl2591_als_period_list[] = {
 179         "0.1 0.2 0.3 0.5 1.0 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0",
 180         "0.2 0.4 0.6 1.0 2.0 4.0 5.0 6.0 7.0 8.0 9.0 10.0 11.0 12.0",
 181         "0.3 0.6 0.9 1.5 3.0 6.0 7.5 9.0 10.5 12.0 13.5 15.0 16.5 18.0",
 182         "0.4 0.8 1.2 2.0 4.0 8.0 10.0 12.0 14.0 16.0 18.0 20.0 22.0 24.0",
 183         "0.5 1.0 1.5 2.5 5.0 10.0 12.5 15.0 17.5 20.0 22.5 25.0 27.5 30.0",
 184         "0.6 1.2 1.8 3.0 6.0 12.0 15.0 18.0 21.0 24.0 27.0 30.0 33.0 36.0",
 185 };
 186
 187 static const int tsl2591_int_time_available[] = {
 188         1, 2, 3, 4, 5, 6,
 189 };
 190
 191 static const int tsl2591_calibscale_available[] = {
 192         1, 25, 428, 9876,
 193 };
 194
 195 static int tsl2591_set_als_lower_threshold(struct tsl2591_chip *chip,
 196                                            u16 als_lower_threshold);
 197 static int tsl2591_set_als_upper_threshold(struct tsl2591_chip *chip,
 198                                            u16 als_upper_threshold);
 199
 200 static int tsl2591_gain_to_multiplier(const u8 als_gain)
 201 {
 202         switch (als_gain) {
 203         case TSL2591_CTRL_ALS_LOW_GAIN:
 204                 return TSL2591_CTRL_ALS_LOW_GAIN_MULTIPLIER;
 205         case TSL2591_CTRL_ALS_MED_GAIN:
 206                 return TSL2591_CTRL_ALS_MED_GAIN_MULTIPLIER;
 207         case TSL2591_CTRL_ALS_HIGH_GAIN:
 208                 return TSL2591_CTRL_ALS_HIGH_GAIN_MULTIPLIER;
 209         case TSL2591_CTRL_ALS_MAX_GAIN:
 210                 return TSL2591_CTRL_ALS_MAX_GAIN_MULTIPLIER;
 211         default:
 212                 return -EINVAL;
 213         }
 214 }
 215
 216 static int tsl2591_multiplier_to_gain(const u32 multiplier)
 217 {
 218         switch (multiplier) {
 219         case TSL2591_CTRL_ALS_LOW_GAIN_MULTIPLIER:
 220                 return TSL2591_CTRL_ALS_LOW_GAIN;
 221         case TSL2591_CTRL_ALS_MED_GAIN_MULTIPLIER:
 222                 return TSL2591_CTRL_ALS_MED_GAIN;
 223         case TSL2591_CTRL_ALS_HIGH_GAIN_MULTIPLIER:
 224                 return TSL2591_CTRL_ALS_HIGH_GAIN;
 225         case TSL2591_CTRL_ALS_MAX_GAIN_MULTIPLIER:
 226                 return TSL2591_CTRL_ALS_MAX_GAIN;
 227         default:
 228                 return -EINVAL;
 229         }
 230 }
 231
 232 static int tsl2591_persist_cycle_to_lit(const u8 als_persist)
 233 {
 234         switch (als_persist) {
 235         case TSL2591_PRST_ALS_INT_CYCLE_ANY:
 236                 return 1;
 237         case TSL2591_PRST_ALS_INT_CYCLE_2:
 238                 return 2;
 239         case TSL2591_PRST_ALS_INT_CYCLE_3:
 240                 return 3;
 241         case TSL2591_PRST_ALS_INT_CYCLE_5:
 242                 return 5;
 243         case TSL2591_PRST_ALS_INT_CYCLE_10:
 244                 return 10;
 245         case TSL2591_PRST_ALS_INT_CYCLE_15:
 246                 return 15;
 247         case TSL2591_PRST_ALS_INT_CYCLE_20:
 248                 return 20;
 249         case TSL2591_PRST_ALS_INT_CYCLE_25:
 250                 return 25;
 251         case TSL2591_PRST_ALS_INT_CYCLE_30:
 252                 return 30;
 253         case TSL2591_PRST_ALS_INT_CYCLE_35:
 254                 return 35;
 255         case TSL2591_PRST_ALS_INT_CYCLE_40:
 256                 return 40;
 257         case TSL2591_PRST_ALS_INT_CYCLE_45:
 258                 return 45;
 259         case TSL2591_PRST_ALS_INT_CYCLE_50:
 260                 return 50;
 261         case TSL2591_PRST_ALS_INT_CYCLE_55:
 262                 return 55;
 263         case TSL2591_PRST_ALS_INT_CYCLE_60:
 264                 return 60;
 265         default:
 266                 return -EINVAL;
 267         }
 268 }
 269
 270 static int tsl2591_persist_lit_to_cycle(const u8 als_persist)
 271 {
 272         switch (als_persist) {
 273         case 1:
 274                 return TSL2591_PRST_ALS_INT_CYCLE_ANY;
 275         case 2:
 276                 return TSL2591_PRST_ALS_INT_CYCLE_2;
 277         case 3:
 278                 return TSL2591_PRST_ALS_INT_CYCLE_3;
 279         case 5:
 280                 return TSL2591_PRST_ALS_INT_CYCLE_5;
 281         case 10:
 282                 return TSL2591_PRST_ALS_INT_CYCLE_10;
 283         case 15:
 284                 return TSL2591_PRST_ALS_INT_CYCLE_15;
 285         case 20:
 286                 return TSL2591_PRST_ALS_INT_CYCLE_20;
 287         case 25:
 288                 return TSL2591_PRST_ALS_INT_CYCLE_25;
 289         case 30:
 290                 return TSL2591_PRST_ALS_INT_CYCLE_30;
 291         case 35:
 292                 return TSL2591_PRST_ALS_INT_CYCLE_35;
 293         case 40:
 294                 return TSL2591_PRST_ALS_INT_CYCLE_40;
 295         case 45:
 296                 return TSL2591_PRST_ALS_INT_CYCLE_45;
 297         case 50:
 298                 return TSL2591_PRST_ALS_INT_CYCLE_50;
 299         case 55:
 300                 return TSL2591_PRST_ALS_INT_CYCLE_55;
 301         case 60:
 302                 return TSL2591_PRST_ALS_INT_CYCLE_60;
 303         default:
 304                 return -EINVAL;
 305         }
 306 }
 307
 308 static int tsl2591_compatible_int_time(struct tsl2591_chip *chip,
 309                                        const u32 als_integration_time)
 310 {
 311         switch (als_integration_time) {
 312         case TSL2591_CTRL_ALS_INTEGRATION_100MS:
 313         case TSL2591_CTRL_ALS_INTEGRATION_200MS:
 314         case TSL2591_CTRL_ALS_INTEGRATION_300MS:
 315         case TSL2591_CTRL_ALS_INTEGRATION_400MS:
 316         case TSL2591_CTRL_ALS_INTEGRATION_500MS:
 317         case TSL2591_CTRL_ALS_INTEGRATION_600MS:
 318                 return 0;
 319         default:
 320                 return -EINVAL;
 321         }
 322 }
 323
 324 static int tsl2591_als_time_to_fval(const u32 als_integration_time)
 325 {
 326         int i;
 327
 328         for (i = 0; i < ARRAY_SIZE(tsl2591_int_time_available); i++) {
 329                 if (als_integration_time == tsl2591_int_time_available[i])
 330                         return TSL2591_SEC_TO_FVAL(als_integration_time);
 331         }
 332
 333         return -EINVAL;
 334 }
 335
 336 static int tsl2591_compatible_gain(struct tsl2591_chip *chip, const u8 als_gain)
 337 {
 338         switch (als_gain) {
 339         case TSL2591_CTRL_ALS_LOW_GAIN:
 340         case TSL2591_CTRL_ALS_MED_GAIN:
 341         case TSL2591_CTRL_ALS_HIGH_GAIN:
 342         case TSL2591_CTRL_ALS_MAX_GAIN:
 343                 return 0;
 344         default:
 345                 return -EINVAL;
 346         }
 347 }
 348
 349 static int tsl2591_compatible_als_persist_cycle(struct tsl2591_chip *chip,
 350                                                 const u32 als_persist)
 351 {
 352         switch (als_persist) {
 353         case TSL2591_PRST_ALS_INT_CYCLE_ANY:
 354         case TSL2591_PRST_ALS_INT_CYCLE_2:
 355         case TSL2591_PRST_ALS_INT_CYCLE_3:
 356         case TSL2591_PRST_ALS_INT_CYCLE_5:
 357         case TSL2591_PRST_ALS_INT_CYCLE_10:
 358         case TSL2591_PRST_ALS_INT_CYCLE_15:
 359         case TSL2591_PRST_ALS_INT_CYCLE_20:
 360         case TSL2591_PRST_ALS_INT_CYCLE_25:
 361         case TSL2591_PRST_ALS_INT_CYCLE_30:
 362         case TSL2591_PRST_ALS_INT_CYCLE_35:
 363         case TSL2591_PRST_ALS_INT_CYCLE_40:
 364         case TSL2591_PRST_ALS_INT_CYCLE_45:
 365         case TSL2591_PRST_ALS_INT_CYCLE_50:
 366         case TSL2591_PRST_ALS_INT_CYCLE_55:
 367         case TSL2591_PRST_ALS_INT_CYCLE_60:
 368                 return 0;
 369         default:
 370                 return -EINVAL;
 371         }
 372 }
 373
 374 static int tsl2591_check_als_valid(struct i2c_client *client)
 375 {
 376         int ret;
 377
 378         ret = i2c_smbus_read_byte_data(client, TSL2591_CMD_NOP | TSL2591_STATUS);
 379         if (ret < 0) {
 380                 dev_err(&client->dev, "Failed to read register\n");
 381                 return -EINVAL;
 382         }
 383
 384         return FIELD_GET(TSL2591_STS_ALS_VALID_MASK, ret);
 385 }
 386
 387 static int tsl2591_wait_adc_complete(struct tsl2591_chip *chip)
 388 {
 389         struct tsl2591_als_settings settings = chip->als_settings;
 390         struct i2c_client *client = chip->client;
 391         int delay;
 392         int val;
 393         int ret;
 394
 395         delay = TSL2591_FVAL_TO_MSEC(settings.als_int_time);
 396         if (!delay)
 397                 return -EINVAL;
 398
 399         /*
 400          * Sleep for ALS integration time to allow enough time or an ADC read
 401          * cycle to complete. Check status after delay for ALS valid.
 402          */
 403         msleep(delay);
 404
 405         /* Check for status ALS valid flag for up to 100ms */
 406         ret = readx_poll_timeout(tsl2591_check_als_valid, client,
 407                                  val, val == TSL2591_STS_VAL_HIGH_MASK,
 408                                  TSL2591_DELAY_PERIOD_US,
 409                                  TSL2591_DELAY_PERIOD_US * TSL2591_ALS_STS_VALID_COUNT);
 410         if (ret)
 411                 dev_err(&client->dev, "Timed out waiting for valid ALS data\n");
 412
 413         return ret;
 414 }
 415
 416 /*
 417  * tsl2591_read_channel_data - Reads raw channel data and calculates lux
 418  *
 419  * Formula for lux calculation;
 420  * Derived from Adafruit's TSL2591 library
 421  * Link: https://github.com/adafruit/Adafruit_TSL2591_Library
 422  * Counts Per Lux (CPL) = (ATIME_ms * AGAIN) / LUX DF
 423  * lux = ((C0DATA - C1DATA) * (1 - (C1DATA / C0DATA))) / CPL
 424  *
 425  * Scale values to get more representative value of lux i.e.
 426  * lux = ((C0DATA - C1DATA) * (1000 - ((C1DATA * 1000) / C0DATA))) / CPL
 427  *
 428  * Channel 0 = IR + Visible
 429  * Channel 1 = IR only
 430  */
 431 static int tsl2591_read_channel_data(struct iio_dev *indio_dev,
 432                                      struct iio_chan_spec const *chan,
 433                                      int *val, int *val2)
 434 {
 435         struct tsl2591_chip *chip = iio_priv(indio_dev);
 436         struct tsl2591_als_settings *settings = &chip->als_settings;
 437         struct i2c_client *client = chip->client;
 438         u8 als_data[TSL2591_NUM_DATA_REGISTERS];
 439         int counts_per_lux, int_time_fval, gain_multi, lux;
 440         u16 als_ch0, als_ch1;
 441         int ret;
 442
 443         ret = tsl2591_wait_adc_complete(chip);
 444         if (ret < 0) {
 445                 dev_err(&client->dev, "No data available. Err: %d\n", ret);
 446                 return ret;
 447         }
 448
 449         ret = i2c_smbus_read_i2c_block_data(client,
 450                                             TSL2591_CMD_NOP | TSL2591_C0_DATAL,
 451                                             sizeof(als_data), als_data);
 452         if (ret < 0) {
 453                 dev_err(&client->dev, "Failed to read data bytes");
 454                 return ret;
 455         }
 456
 457         als_ch0 = get_unaligned_le16(&als_data[0]);
 458         als_ch1 = get_unaligned_le16(&als_data[2]);
 459
 460         switch (chan->type) {
 461         case IIO_INTENSITY:
 462                 if (chan->channel2 == IIO_MOD_LIGHT_BOTH)
 463                         *val = als_ch0;
 464                 else if (chan->channel2 == IIO_MOD_LIGHT_IR)
 465                         *val = als_ch1;
 466                 else
 467                         return -EINVAL;
 468                 break;
 469         case IIO_LIGHT:
 470                 gain_multi = tsl2591_gain_to_multiplier(settings->als_gain);
 471                 if (gain_multi < 0) {
 472                         dev_err(&client->dev, "Invalid multiplier");
 473                         return gain_multi;
 474                 }
 475
 476                 int_time_fval = TSL2591_FVAL_TO_MSEC(settings->als_int_time);
 477                 /* Calculate counts per lux value */
 478                 counts_per_lux = (int_time_fval * gain_multi) / TSL2591_LUX_COEFFICIENT;
 479
 480                 dev_dbg(&client->dev, "Counts Per Lux: %d\n", counts_per_lux);
 481
 482                 /* Calculate lux value */
 483                 lux = ((als_ch0 - als_ch1) *
 484                        (1000 - ((als_ch1 * 1000) / als_ch0))) / counts_per_lux;
 485
 486                 dev_dbg(&client->dev, "Raw lux calculation: %d\n", lux);
 487
 488                 /* Divide by 1000 to get real lux value before scaling */
 489                 *val = lux / 1000;
 490
 491                 /* Get the decimal part of lux reading */
 492                 *val2 = (lux - (*val * 1000)) * 1000;
 493
 494                 break;
 495         default:
 496                 return -EINVAL;
 497         }
 498
 499         return 0;
 500 }
 501
 502 static int tsl2591_set_als_gain_int_time(struct tsl2591_chip *chip)
 503 {
 504         struct tsl2591_als_settings als_settings = chip->als_settings;
 505         struct i2c_client *client = chip->client;
 506         int ret;
 507
 508         ret = i2c_smbus_write_byte_data(client,
 509                                         TSL2591_CMD_NOP | TSL2591_CONTROL,
 510                                         als_settings.als_int_time | als_settings.als_gain);
 511         if (ret)
 512                 dev_err(&client->dev, "Failed to set als gain & int time\n");
 513
 514         return ret;
 515 }
 516
 517 static int tsl2591_set_als_lower_threshold(struct tsl2591_chip *chip,
 518                                            u16 als_lower_threshold)
 519 {
 520         struct tsl2591_als_settings als_settings = chip->als_settings;
 521         struct i2c_client *client = chip->client;
 522         u16 als_upper_threshold;
 523         u8 als_lower_l;
 524         u8 als_lower_h;
 525         int ret;
 526
 527         chip->als_settings.als_lower_thresh = als_lower_threshold;
 528
 529         /*
 530          * Lower threshold should not be greater or equal to upper.
 531          * If this is the case, then assert upper threshold to new lower
 532          * threshold + 1 to avoid ordering issues when setting thresholds.
 533          */
 534         if (als_lower_threshold >= als_settings.als_upper_thresh) {
 535                 als_upper_threshold = als_lower_threshold + 1;
 536                 tsl2591_set_als_upper_threshold(chip, als_upper_threshold);
 537         }
 538
 539         als_lower_l = als_lower_threshold;
 540         als_lower_h = als_lower_threshold >> 8;
 541
 542         ret = i2c_smbus_write_byte_data(client,
 543                                         TSL2591_CMD_NOP | TSL2591_AILTL,
 544                                         als_lower_l);
 545         if (ret) {
 546                 dev_err(&client->dev, "Failed to set als lower threshold\n");
 547                 return ret;
 548         }
 549
 550         ret = i2c_smbus_write_byte_data(client,
 551                                         TSL2591_CMD_NOP | TSL2591_AILTH,
 552                                         als_lower_h);
 553         if (ret) {
 554                 dev_err(&client->dev, "Failed to set als lower threshold\n");
 555                 return ret;
 556         }
 557
 558         return 0;
 559 }
 560
 561 static int tsl2591_set_als_upper_threshold(struct tsl2591_chip *chip,
 562                                            u16 als_upper_threshold)
 563 {
 564         struct tsl2591_als_settings als_settings = chip->als_settings;
 565         struct i2c_client *client = chip->client;
 566         u16 als_lower_threshold;
 567         u8 als_upper_l;
 568         u8 als_upper_h;
 569         int ret;
 570
 571         if (als_upper_threshold > TSL2591_ALS_MAX_VALUE)
 572                 return -EINVAL;
 573
 574         chip->als_settings.als_upper_thresh = als_upper_threshold;
 575
 576         /*
 577          * Upper threshold should not be less than lower. If this
 578          * is the case, then assert lower threshold to new upper
 579          * threshold - 1 to avoid ordering issues when setting thresholds.
 580          */
 581         if (als_upper_threshold < als_settings.als_lower_thresh) {
 582                 als_lower_threshold = als_upper_threshold - 1;
 583                 tsl2591_set_als_lower_threshold(chip, als_lower_threshold);
 584         }
 585
 586         als_upper_l = als_upper_threshold;
 587         als_upper_h = als_upper_threshold >> 8;
 588
 589         ret = i2c_smbus_write_byte_data(client,
 590                                         TSL2591_CMD_NOP | TSL2591_AIHTL,
 591                                         als_upper_l);
 592         if (ret) {
 593                 dev_err(&client->dev, "Failed to set als upper threshold\n");
 594                 return ret;
 595         }
 596
 597         ret = i2c_smbus_write_byte_data(client,
 598                                         TSL2591_CMD_NOP | TSL2591_AIHTH,
 599                                         als_upper_h);
 600         if (ret) {
 601                 dev_err(&client->dev, "Failed to set als upper threshold\n");
 602                 return ret;
 603         }
 604
 605         return 0;
 606 }
 607
 608 static int tsl2591_set_als_persist_cycle(struct tsl2591_chip *chip,
 609                                          u8 als_persist)
 610 {
 611         struct i2c_client *client = chip->client;
 612         int ret;
 613
 614         ret = i2c_smbus_write_byte_data(client,
 615                                         TSL2591_CMD_NOP | TSL2591_PERSIST,
 616                                         als_persist);
 617         if (ret)
 618                 dev_err(&client->dev, "Failed to set als persist cycle\n");
 619
 620         chip->als_settings.als_persist = als_persist;
 621
 622         return ret;
 623 }
 624
 625 static int tsl2591_set_power_state(struct tsl2591_chip *chip, u8 state)
 626 {
 627         struct i2c_client *client = chip->client;
 628         int ret;
 629
 630         ret = i2c_smbus_write_byte_data(client,
 631                                         TSL2591_CMD_NOP | TSL2591_ENABLE,
 632                                         state);
 633         if (ret)
 634                 dev_err(&client->dev,
 635                         "Failed to set the power state to %#04x\n", state);
 636
 637         return ret;
 638 }
 639
 640 static ssize_t tsl2591_in_illuminance_period_available_show(struct device *dev,
 641                                                             struct device_attribute *attr,
 642                                                             char *buf)
 643 {
 644         struct iio_dev *indio_dev = dev_to_iio_dev(dev);
 645         struct tsl2591_chip *chip = iio_priv(indio_dev);
 646
 647         return sysfs_emit(buf, "%s\n",
 648                        tsl2591_als_period_list[chip->als_settings.als_int_time]);
 649 }
 650
 651 static IIO_DEVICE_ATTR_RO(tsl2591_in_illuminance_period_available, 0);
 652
 653 static struct attribute *tsl2591_event_attrs_ctrl[] = {
 654         &iio_dev_attr_tsl2591_in_illuminance_period_available.dev_attr.attr,
 655         NULL
 656 };
 657
 658 static const struct attribute_group tsl2591_event_attribute_group = {
 659         .attrs = tsl2591_event_attrs_ctrl,
 660 };
 661
 662 static const struct iio_event_spec tsl2591_events[] = {
 663         {
 664                 .type = IIO_EV_TYPE_THRESH,
 665                 .dir = IIO_EV_DIR_RISING,
 666                 .mask_separate = BIT(IIO_EV_INFO_VALUE),
 667         }, {
 668                 .type = IIO_EV_TYPE_THRESH,
 669                 .dir = IIO_EV_DIR_FALLING,
 670                 .mask_separate = BIT(IIO_EV_INFO_VALUE),
 671         }, {
 672                 .type = IIO_EV_TYPE_THRESH,
 673                 .dir = IIO_EV_DIR_EITHER,
 674                 .mask_separate = BIT(IIO_EV_INFO_PERIOD) |
 675                                 BIT(IIO_EV_INFO_ENABLE),
 676         },
 677 };
 678
 679 static const struct iio_chan_spec tsl2591_channels[] = {
 680         {
 681                 .type = IIO_INTENSITY,
 682                 .modified = 1,
 683                 .channel2 = IIO_MOD_LIGHT_IR,
 684                 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
 685                 .info_mask_shared_by_all_available = BIT(IIO_CHAN_INFO_INT_TIME) |
 686                                                      BIT(IIO_CHAN_INFO_CALIBSCALE),
 687                 .info_mask_shared_by_all = BIT(IIO_CHAN_INFO_INT_TIME) |
 688                                            BIT(IIO_CHAN_INFO_CALIBSCALE)
 689         },
 690         {
 691                 .type = IIO_INTENSITY,
 692                 .modified = 1,
 693                 .channel2 = IIO_MOD_LIGHT_BOTH,
 694                 .event_spec = tsl2591_events,
 695                 .num_event_specs = ARRAY_SIZE(tsl2591_events),
 696                 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
 697                 .info_mask_shared_by_all_available = BIT(IIO_CHAN_INFO_INT_TIME) |
 698                                                      BIT(IIO_CHAN_INFO_CALIBSCALE),
 699                 .info_mask_shared_by_all = BIT(IIO_CHAN_INFO_INT_TIME) |
 700                                            BIT(IIO_CHAN_INFO_CALIBSCALE)
 701         },
 702         {
 703                 .type = IIO_LIGHT,
 704                 .info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED),
 705                 .info_mask_shared_by_all_available = BIT(IIO_CHAN_INFO_INT_TIME) |
 706                                                      BIT(IIO_CHAN_INFO_CALIBSCALE),
 707                 .info_mask_shared_by_all = BIT(IIO_CHAN_INFO_INT_TIME) |
 708                                            BIT(IIO_CHAN_INFO_CALIBSCALE)
 709         },
 710 };
 711
 712 static int tsl2591_read_raw(struct iio_dev *indio_dev,
 713                             struct iio_chan_spec const *chan,
 714                             int *val, int *val2, long mask)
 715 {
 716         struct tsl2591_chip *chip = iio_priv(indio_dev);
 717         struct i2c_client *client = chip->client;
 718         int ret;
 719
 720         pm_runtime_get_sync(&client->dev);
 721
 722         mutex_lock(&chip->als_mutex);
 723
 724         switch (mask) {
 725         case IIO_CHAN_INFO_RAW:
 726                 if (chan->type != IIO_INTENSITY) {
 727                         ret = -EINVAL;
 728                         goto err_unlock;
 729                 }
 730
 731                 ret = tsl2591_read_channel_data(indio_dev, chan, val, val2);
 732                 if (ret < 0)
 733                         goto err_unlock;
 734
 735                 ret = IIO_VAL_INT;
 736                 break;
 737         case IIO_CHAN_INFO_PROCESSED:
 738                 if (chan->type != IIO_LIGHT) {
 739                         ret = -EINVAL;
 740                         goto err_unlock;
 741                 }
 742
 743                 ret = tsl2591_read_channel_data(indio_dev, chan, val, val2);
 744                 if (ret < 0)
 745                         break;
 746
 747                 ret = IIO_VAL_INT_PLUS_MICRO;
 748                 break;
 749         case IIO_CHAN_INFO_INT_TIME:
 750                 if (chan->type != IIO_INTENSITY) {
 751                         ret = -EINVAL;
 752                         goto err_unlock;
 753                 }
 754
 755                 *val = TSL2591_FVAL_TO_SEC(chip->als_settings.als_int_time);
 756                 ret = IIO_VAL_INT;
 757                 break;
 758         case IIO_CHAN_INFO_CALIBSCALE:
 759                 if (chan->type != IIO_INTENSITY) {
 760                         ret = -EINVAL;
 761                         goto err_unlock;
 762                 }
 763
 764                 *val = tsl2591_gain_to_multiplier(chip->als_settings.als_gain);
 765                 ret = IIO_VAL_INT;
 766                 break;
 767         default:
 768                 ret = -EINVAL;
 769                 break;
 770         }
 771
 772 err_unlock:
 773         mutex_unlock(&chip->als_mutex);
 774
 775         pm_runtime_mark_last_busy(&client->dev);
 776         pm_runtime_put_autosuspend(&client->dev);
 777
 778         return ret;
 779 }
 780
 781 static int tsl2591_write_raw(struct iio_dev *indio_dev,
 782                              struct iio_chan_spec const *chan,
 783                              int val, int val2, long mask)
 784 {
 785         struct tsl2591_chip *chip = iio_priv(indio_dev);
 786         int int_time;
 787         int gain;
 788         int ret;
 789
 790         mutex_lock(&chip->als_mutex);
 791
 792         switch (mask) {
 793         case IIO_CHAN_INFO_INT_TIME:
 794                 int_time = tsl2591_als_time_to_fval(val);
 795                 if (int_time < 0) {
 796                         ret = int_time;
 797                         goto err_unlock;
 798                 }
 799                 ret = tsl2591_compatible_int_time(chip, int_time);
 800                 if (ret < 0)
 801                         goto err_unlock;
 802
 803                 chip->als_settings.als_int_time = int_time;
 804                 break;
 805         case IIO_CHAN_INFO_CALIBSCALE:
 806                 gain = tsl2591_multiplier_to_gain(val);
 807                 if (gain < 0) {
 808                         ret = gain;
 809                         goto err_unlock;
 810                 }
 811                 ret = tsl2591_compatible_gain(chip, gain);
 812                 if (ret < 0)
 813                         goto err_unlock;
 814
 815                 chip->als_settings.als_gain = gain;
 816                 break;
 817         default:
 818                 ret = -EINVAL;
 819                 goto err_unlock;
 820         }
 821
 822         ret = tsl2591_set_als_gain_int_time(chip);
 823
 824 err_unlock:
 825         mutex_unlock(&chip->als_mutex);
 826         return ret;
 827 }
 828
 829 static int tsl2591_read_available(struct iio_dev *indio_dev,
 830                                   struct iio_chan_spec const *chan,
 831                                   const int **vals, int *type, int *length,
 832                                   long mask)
 833 {
 834         switch (mask) {
 835         case IIO_CHAN_INFO_INT_TIME:
 836                 *length = ARRAY_SIZE(tsl2591_int_time_available);
 837                 *vals = tsl2591_int_time_available;
 838                 *type = IIO_VAL_INT;
 839                 return IIO_AVAIL_LIST;
 840
 841         case IIO_CHAN_INFO_CALIBSCALE:
 842                 *length = ARRAY_SIZE(tsl2591_calibscale_available);
 843                 *vals = tsl2591_calibscale_available;
 844                 *type = IIO_VAL_INT;
 845                 return IIO_AVAIL_LIST;
 846         default:
 847                 return -EINVAL;
 848         }
 849 }
 850
 851 static int tsl2591_read_event_value(struct iio_dev *indio_dev,
 852                                     const struct iio_chan_spec *chan,
 853                                     enum iio_event_type type,
 854                                     enum iio_event_direction dir,
 855                                     enum iio_event_info info, int *val,
 856                                     int *val2)
 857 {
 858         struct tsl2591_chip *chip = iio_priv(indio_dev);
 859         struct i2c_client *client = chip->client;
 860         int als_persist, int_time, period;
 861         int ret;
 862
 863         mutex_lock(&chip->als_mutex);
 864
 865         switch (info) {
 866         case IIO_EV_INFO_VALUE:
 867                 switch (dir) {
 868                 case IIO_EV_DIR_RISING:
 869                         *val = chip->als_settings.als_upper_thresh;
 870                         break;
 871                 case IIO_EV_DIR_FALLING:
 872                         *val = chip->als_settings.als_lower_thresh;
 873                         break;
 874                 default:
 875                         ret = -EINVAL;
 876                         goto err_unlock;
 877                 }
 878                 ret = IIO_VAL_INT;
 879                 break;
 880         case IIO_EV_INFO_PERIOD:
 881                 ret = i2c_smbus_read_byte_data(client,
 882                                                TSL2591_CMD_NOP | TSL2591_PERSIST);
 883                 if (ret <= 0 || ret > TSL2591_PRST_ALS_INT_CYCLE_MAX)
 884                         goto err_unlock;
 885
 886                 als_persist = tsl2591_persist_cycle_to_lit(ret);
 887                 int_time = TSL2591_FVAL_TO_MSEC(chip->als_settings.als_int_time);
 888                 period = als_persist * (int_time * MSEC_PER_SEC);
 889
 890                 *val = period / USEC_PER_SEC;
 891                 *val2 = period % USEC_PER_SEC;
 892
 893                 ret = IIO_VAL_INT_PLUS_MICRO;
 894                 break;
 895         default:
 896                 ret = -EINVAL;
 897                 break;
 898         }
 899
 900 err_unlock:
 901         mutex_unlock(&chip->als_mutex);
 902         return ret;
 903 }
 904
 905 static int tsl2591_write_event_value(struct iio_dev *indio_dev,
 906                                      const struct iio_chan_spec *chan,
 907                                      enum iio_event_type type,
 908                                      enum iio_event_direction dir,
 909                                      enum iio_event_info info, int val,
 910                                      int val2)
 911 {
 912         struct tsl2591_chip *chip = iio_priv(indio_dev);
 913         int period, int_time, als_persist;
 914         int ret;
 915
 916         if (val < 0 || val2 < 0)
 917                 return -EINVAL;
 918
 919         mutex_lock(&chip->als_mutex);
 920
 921         switch (info) {
 922         case IIO_EV_INFO_VALUE:
 923                 if (val > TSL2591_ALS_MAX_VALUE) {
 924                         ret = -EINVAL;
 925                         goto err_unlock;
 926                 }
 927
 928                 switch (dir) {
 929                 case IIO_EV_DIR_RISING:
 930                         ret = tsl2591_set_als_upper_threshold(chip, val);
 931                         if (ret < 0)
 932                                 goto err_unlock;
 933                         break;
 934                 case IIO_EV_DIR_FALLING:
 935                         ret = tsl2591_set_als_lower_threshold(chip, val);
 936                         if (ret < 0)
 937                                 goto err_unlock;
 938                         break;
 939                 default:
 940                         ret = -EINVAL;
 941                         goto err_unlock;
 942                 }
 943                 break;
 944         case IIO_EV_INFO_PERIOD:
 945                 int_time = TSL2591_FVAL_TO_MSEC(chip->als_settings.als_int_time);
 946
 947                 period = ((val * MSEC_PER_SEC) +
 948                          (val2 / MSEC_PER_SEC)) / int_time;
 949
 950                 als_persist = tsl2591_persist_lit_to_cycle(period);
 951                 if (als_persist < 0) {
 952                         ret = -EINVAL;
 953                         goto err_unlock;
 954                 }
 955
 956                 ret = tsl2591_compatible_als_persist_cycle(chip, als_persist);
 957                 if (ret < 0)
 958                         goto err_unlock;
 959
 960                 ret = tsl2591_set_als_persist_cycle(chip, als_persist);
 961                 if (ret < 0)
 962                         goto err_unlock;
 963                 break;
 964         default:
 965                 ret = -EINVAL;
 966                 break;
 967         }
 968
 969 err_unlock:
 970         mutex_unlock(&chip->als_mutex);
 971         return ret;
 972 }
 973
 974 static int tsl2591_read_event_config(struct iio_dev *indio_dev,
 975                                      const struct iio_chan_spec *chan,
 976                                      enum iio_event_type type,
 977                                      enum iio_event_direction dir)
 978 {
 979         struct tsl2591_chip *chip = iio_priv(indio_dev);
 980
 981         return chip->events_enabled;
 982 }
 983
 984 static int tsl2591_write_event_config(struct iio_dev *indio_dev,
 985                                       const struct iio_chan_spec *chan,
 986                                       enum iio_event_type type,
 987                                       enum iio_event_direction dir,
 988                                       int state)
 989 {
 990         struct tsl2591_chip *chip = iio_priv(indio_dev);
 991         struct i2c_client *client = chip->client;
 992
 993         if (state && !chip->events_enabled) {
 994                 chip->events_enabled = true;
 995                 pm_runtime_get_sync(&client->dev);
 996         } else if (!state && chip->events_enabled) {
 997                 chip->events_enabled = false;
 998                 pm_runtime_mark_last_busy(&client->dev);
 999                 pm_runtime_put_autosuspend(&client->dev);
1000         }
1001
1002         return 0;
1003 }
1004
1005 static const struct iio_info tsl2591_info = {
1006         .event_attrs = &tsl2591_event_attribute_group,
1007         .read_raw = tsl2591_read_raw,
1008         .write_raw = tsl2591_write_raw,
1009         .read_avail = tsl2591_read_available,
1010         .read_event_value = tsl2591_read_event_value,
1011         .write_event_value = tsl2591_write_event_value,
1012         .read_event_config = tsl2591_read_event_config,
1013         .write_event_config = tsl2591_write_event_config,
1014 };
1015
1016 static const struct iio_info tsl2591_info_no_irq = {
1017         .read_raw = tsl2591_read_raw,
1018         .write_raw = tsl2591_write_raw,
1019         .read_avail = tsl2591_read_available,
1020 };
1021
1022 static int tsl2591_suspend(struct device *dev)
1023 {
1024         struct iio_dev *indio_dev = dev_get_drvdata(dev);
1025         struct tsl2591_chip *chip = iio_priv(indio_dev);
1026         int ret;
1027
1028         mutex_lock(&chip->als_mutex);
1029         ret = tsl2591_set_power_state(chip, TSL2591_PWR_OFF);
1030         mutex_unlock(&chip->als_mutex);
1031
1032         return ret;
1033 }
1034
1035 static int tsl2591_resume(struct device *dev)
1036 {
1037         int power_state = TSL2591_PWR_ON | TSL2591_ENABLE_ALS;
1038         struct iio_dev *indio_dev = dev_get_drvdata(dev);
1039         struct tsl2591_chip *chip = iio_priv(indio_dev);
1040         int ret;
1041
1042         if (chip->events_enabled)
1043                 power_state |= TSL2591_ENABLE_ALS_INT;
1044
1045         mutex_lock(&chip->als_mutex);
1046         ret = tsl2591_set_power_state(chip, power_state);
1047         mutex_unlock(&chip->als_mutex);
1048
1049         return ret;
1050 }
1051
1052 static DEFINE_RUNTIME_DEV_PM_OPS(tsl2591_pm_ops, tsl2591_suspend,
1053                                  tsl2591_resume, NULL);
1054
1055 static irqreturn_t tsl2591_event_handler(int irq, void *private)
1056 {
1057         struct iio_dev *dev_info = private;
1058         struct tsl2591_chip *chip = iio_priv(dev_info);
1059         struct i2c_client *client = chip->client;
1060
1061         if (!chip->events_enabled)
1062                 return IRQ_NONE;
1063
1064         iio_push_event(dev_info,
1065                        IIO_UNMOD_EVENT_CODE(IIO_LIGHT, 0,
1066                                             IIO_EV_TYPE_THRESH,
1067                                             IIO_EV_DIR_EITHER),
1068                                             iio_get_time_ns(dev_info));
1069
1070         /* Clear ALS irq */
1071         i2c_smbus_write_byte(client, TSL2591_CMD_SF_CALS_NPI);
1072
1073         return IRQ_HANDLED;
1074 }
1075
1076 static int tsl2591_load_defaults(struct tsl2591_chip *chip)
1077 {
1078         int ret;
1079
1080         chip->als_settings.als_int_time = TSL2591_DEFAULT_ALS_INT_TIME;
1081         chip->als_settings.als_gain = TSL2591_DEFAULT_ALS_GAIN;
1082         chip->als_settings.als_lower_thresh = TSL2591_DEFAULT_ALS_LOWER_THRESH;
1083         chip->als_settings.als_upper_thresh = TSL2591_DEFAULT_ALS_UPPER_THRESH;
1084
1085         ret = tsl2591_set_als_gain_int_time(chip);
1086         if (ret < 0)
1087                 return ret;
1088
1089         ret = tsl2591_set_als_persist_cycle(chip, TSL2591_DEFAULT_ALS_PERSIST);
1090         if (ret < 0)
1091                 return ret;
1092
1093         ret = tsl2591_set_als_lower_threshold(chip, TSL2591_DEFAULT_ALS_LOWER_THRESH);
1094         if (ret < 0)
1095                 return ret;
1096
1097         ret = tsl2591_set_als_upper_threshold(chip, TSL2591_DEFAULT_ALS_UPPER_THRESH);
1098         if (ret < 0)
1099                 return ret;
1100
1101         return 0;
1102 }
1103
1104 static void tsl2591_chip_off(void *data)
1105 {
1106         struct iio_dev *indio_dev = data;
1107         struct tsl2591_chip *chip = iio_priv(indio_dev);
1108         struct i2c_client *client = chip->client;
1109
1110         pm_runtime_disable(&client->dev);
1111         pm_runtime_set_suspended(&client->dev);
1112         pm_runtime_put_noidle(&client->dev);
1113
1114         tsl2591_set_power_state(chip, TSL2591_PWR_OFF);
1115 }
1116
1117 static int tsl2591_probe(struct i2c_client *client)
1118 {
1119         struct tsl2591_chip *chip;
1120         struct iio_dev *indio_dev;
1121         int ret;
1122
1123         if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE_DATA)) {
1124                 dev_err(&client->dev,
1125                         "I2C smbus byte data functionality is not supported\n");
1126                 return -EOPNOTSUPP;
1127         }
1128
1129         indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*chip));
1130         if (!indio_dev)
1131                 return -ENOMEM;
1132
1133         chip = iio_priv(indio_dev);
1134         chip->client = client;
1135         i2c_set_clientdata(client, indio_dev);
1136
1137         if (client->irq) {
1138                 ret = devm_request_threaded_irq(&client->dev, client->irq,
1139                                                 NULL, tsl2591_event_handler,
1140                                                 IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
1141                                                 "tsl2591_irq", indio_dev);
1142                 if (ret) {
1143                         dev_err_probe(&client->dev, ret, "IRQ request error\n");
1144                         return -EINVAL;
1145                 }
1146                 indio_dev->info = &tsl2591_info;
1147         } else {
1148                 indio_dev->info = &tsl2591_info_no_irq;
1149         }
1150
1151         mutex_init(&chip->als_mutex);
1152
1153         ret = i2c_smbus_read_byte_data(client,
1154                                        TSL2591_CMD_NOP | TSL2591_DEVICE_ID);
1155         if (ret < 0) {
1156                 dev_err(&client->dev,
1157                         "Failed to read the device ID register\n");
1158                 return ret;
1159         }
1160         ret = FIELD_GET(TSL2591_DEVICE_ID_MASK, ret);
1161         if (ret != TSL2591_DEVICE_ID_VAL) {
1162                 dev_err(&client->dev, "Device ID: %#04x unknown\n", ret);
1163                 return -EINVAL;
1164         }
1165
1166         indio_dev->channels = tsl2591_channels;
1167         indio_dev->num_channels = ARRAY_SIZE(tsl2591_channels);
1168         indio_dev->modes = INDIO_DIRECT_MODE;
1169         indio_dev->name = chip->client->name;
1170         chip->events_enabled = false;
1171
1172         pm_runtime_enable(&client->dev);
1173         pm_runtime_set_autosuspend_delay(&client->dev,
1174                                          TSL2591_POWER_OFF_DELAY_MS);
1175         pm_runtime_use_autosuspend(&client->dev);
1176
1177         /*
1178          * Add chip off to automatically managed path and disable runtime
1179          * power management. This ensures that the chip power management
1180          * is handled correctly on driver remove. tsl2591_chip_off() must be
1181          * added to the managed path after pm runtime is enabled and before
1182          * any error exit paths are met to ensure we're not left in a state
1183          * of pm runtime not being disabled properly.
1184          */
1185         ret = devm_add_action_or_reset(&client->dev, tsl2591_chip_off,
1186                                        indio_dev);
1187         if (ret < 0)
1188                 return -EINVAL;
1189
1190         ret = tsl2591_load_defaults(chip);
1191         if (ret < 0) {
1192                 dev_err(&client->dev, "Failed to load sensor defaults\n");
1193                 return -EINVAL;
1194         }
1195
1196         ret = i2c_smbus_write_byte(client, TSL2591_CMD_SF_CALS_NPI);
1197         if (ret < 0) {
1198                 dev_err(&client->dev, "Failed to clear als irq\n");
1199                 return -EINVAL;
1200         }
1201
1202         return devm_iio_device_register(&client->dev, indio_dev);
1203 }
1204
1205 static const struct of_device_id tsl2591_of_match[] = {
1206         { .compatible = "amstaos,tsl2591"},
1207         {}
1208 };
1209 MODULE_DEVICE_TABLE(of, tsl2591_of_match);
1210
1211 static struct i2c_driver tsl2591_driver = {
1212         .driver = {
1213                 .name = "tsl2591",
1214                 .pm = pm_ptr(&tsl2591_pm_ops),
1215                 .of_match_table = tsl2591_of_match,
1216         },
1217         .probe = tsl2591_probe
1218 };
1219 module_i2c_driver(tsl2591_driver);
1220
1221 MODULE_AUTHOR("Joe Sandom <joe.g.sandom@gmail.com>");
1222 MODULE_DESCRIPTION("TAOS tsl2591 ambient light sensor driver");
1223 MODULE_LICENSE("GPL");