drivers/iio/light/ltr501.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Support for Lite-On LTR501 and similar ambient light and proximity sensors.
   4  *
   5  * Copyright 2014 Peter Meerwald <pmeerw@pmeerw.net>
   6  *
   7  * 7-bit I2C slave address 0x23
   8  *
   9  * TODO: IR LED characteristics
  10  */
  11
  12 #include <linux/module.h>
  13 #include <linux/i2c.h>
  14 #include <linux/err.h>
  15 #include <linux/delay.h>
  16 #include <linux/regmap.h>
  17 #include <linux/acpi.h>
  18 #include <linux/regulator/consumer.h>
  19
  20 #include <linux/iio/iio.h>
  21 #include <linux/iio/events.h>
  22 #include <linux/iio/sysfs.h>
  23 #include <linux/iio/trigger_consumer.h>
  24 #include <linux/iio/buffer.h>
  25 #include <linux/iio/triggered_buffer.h>
  26
  27 #define LTR501_DRV_NAME "ltr501"
  28
  29 #define LTR501_ALS_CONTR 0x80 /* ALS operation mode, SW reset */
  30 #define LTR501_PS_CONTR 0x81 /* PS operation mode */
  31 #define LTR501_PS_MEAS_RATE 0x84 /* measurement rate*/
  32 #define LTR501_ALS_MEAS_RATE 0x85 /* ALS integ time, measurement rate*/
  33 #define LTR501_PART_ID 0x86
  34 #define LTR501_MANUFAC_ID 0x87
  35 #define LTR501_ALS_DATA1 0x88 /* 16-bit, little endian */
  36 #define LTR501_ALS_DATA1_UPPER 0x89 /* upper 8 bits of LTR501_ALS_DATA1 */
  37 #define LTR501_ALS_DATA0 0x8a /* 16-bit, little endian */
  38 #define LTR501_ALS_DATA0_UPPER 0x8b /* upper 8 bits of LTR501_ALS_DATA0 */
  39 #define LTR501_ALS_PS_STATUS 0x8c
  40 #define LTR501_PS_DATA 0x8d /* 16-bit, little endian */
  41 #define LTR501_PS_DATA_UPPER 0x8e /* upper 8 bits of LTR501_PS_DATA */
  42 #define LTR501_INTR 0x8f /* output mode, polarity, mode */
  43 #define LTR501_PS_THRESH_UP 0x90 /* 11 bit, ps upper threshold */
  44 #define LTR501_PS_THRESH_LOW 0x92 /* 11 bit, ps lower threshold */
  45 #define LTR501_ALS_THRESH_UP 0x97 /* 16 bit, ALS upper threshold */
  46 #define LTR501_ALS_THRESH_LOW 0x99 /* 16 bit, ALS lower threshold */
  47 #define LTR501_INTR_PRST 0x9e /* ps thresh, als thresh */
  48 #define LTR501_MAX_REG 0x9f
  49
  50 #define LTR501_ALS_CONTR_SW_RESET BIT(2)
  51 #define LTR501_CONTR_PS_GAIN_MASK (BIT(3) | BIT(2))
  52 #define LTR501_CONTR_PS_GAIN_SHIFT 2
  53 #define LTR501_CONTR_ALS_GAIN_MASK BIT(3)
  54 #define LTR501_CONTR_ACTIVE BIT(1)
  55
  56 #define LTR501_STATUS_ALS_INTR BIT(3)
  57 #define LTR501_STATUS_ALS_RDY BIT(2)
  58 #define LTR501_STATUS_PS_INTR BIT(1)
  59 #define LTR501_STATUS_PS_RDY BIT(0)
  60
  61 #define LTR501_PS_DATA_MASK 0x7ff
  62 #define LTR501_PS_THRESH_MASK 0x7ff
  63 #define LTR501_ALS_THRESH_MASK 0xffff
  64
  65 #define LTR501_ALS_DEF_PERIOD 500000
  66 #define LTR501_PS_DEF_PERIOD 100000
  67
  68 #define LTR501_REGMAP_NAME "ltr501_regmap"
  69
  70 #define LTR501_LUX_CONV(vis_coeff, vis_data, ir_coeff, ir_data) \
  71                         ((vis_coeff * vis_data) - (ir_coeff * ir_data))
  72
  73 static const int int_time_mapping[] = {100000, 50000, 200000, 400000};
  74
  75 static const struct reg_field reg_field_it =
  76                                 REG_FIELD(LTR501_ALS_MEAS_RATE, 3, 4);
  77 static const struct reg_field reg_field_als_intr =
  78                                 REG_FIELD(LTR501_INTR, 1, 1);
  79 static const struct reg_field reg_field_ps_intr =
  80                                 REG_FIELD(LTR501_INTR, 0, 0);
  81 static const struct reg_field reg_field_als_rate =
  82                                 REG_FIELD(LTR501_ALS_MEAS_RATE, 0, 2);
  83 static const struct reg_field reg_field_ps_rate =
  84                                 REG_FIELD(LTR501_PS_MEAS_RATE, 0, 3);
  85 static const struct reg_field reg_field_als_prst =
  86                                 REG_FIELD(LTR501_INTR_PRST, 0, 3);
  87 static const struct reg_field reg_field_ps_prst =
  88                                 REG_FIELD(LTR501_INTR_PRST, 4, 7);
  89
  90 struct ltr501_samp_table {
  91         int freq_val;  /* repetition frequency in micro HZ*/
  92         int time_val; /* repetition rate in micro seconds */
  93 };
  94
  95 #define LTR501_RESERVED_GAIN -1
  96
  97 enum {
  98         ltr501 = 0,
  99         ltr559,
 100         ltr301,
 101         ltr303,
 102 };
 103
 104 struct ltr501_gain {
 105         int scale;
 106         int uscale;
 107 };
 108
 109 static const struct ltr501_gain ltr501_als_gain_tbl[] = {
 110         {1, 0},
 111         {0, 5000},
 112 };
 113
 114 static const struct ltr501_gain ltr559_als_gain_tbl[] = {
 115         {1, 0},
 116         {0, 500000},
 117         {0, 250000},
 118         {0, 125000},
 119         {LTR501_RESERVED_GAIN, LTR501_RESERVED_GAIN},
 120         {LTR501_RESERVED_GAIN, LTR501_RESERVED_GAIN},
 121         {0, 20000},
 122         {0, 10000},
 123 };
 124
 125 static const struct ltr501_gain ltr501_ps_gain_tbl[] = {
 126         {1, 0},
 127         {0, 250000},
 128         {0, 125000},
 129         {0, 62500},
 130 };
 131
 132 static const struct ltr501_gain ltr559_ps_gain_tbl[] = {
 133         {0, 62500}, /* x16 gain */
 134         {0, 31250}, /* x32 gain */
 135         {0, 15625}, /* bits X1 are for x64 gain */
 136         {0, 15624},
 137 };
 138
 139 struct ltr501_chip_info {
 140         u8 partid;
 141         const struct ltr501_gain *als_gain;
 142         int als_gain_tbl_size;
 143         const struct ltr501_gain *ps_gain;
 144         int ps_gain_tbl_size;
 145         u8 als_mode_active;
 146         u8 als_gain_mask;
 147         u8 als_gain_shift;
 148         struct iio_chan_spec const *channels;
 149         const int no_channels;
 150         const struct iio_info *info;
 151         const struct iio_info *info_no_irq;
 152 };
 153
 154 struct ltr501_data {
 155         struct i2c_client *client;
 156         struct mutex lock_als, lock_ps;
 157         const struct ltr501_chip_info *chip_info;
 158         u8 als_contr, ps_contr;
 159         int als_period, ps_period; /* period in micro seconds */
 160         struct regmap *regmap;
 161         struct regmap_field *reg_it;
 162         struct regmap_field *reg_als_intr;
 163         struct regmap_field *reg_ps_intr;
 164         struct regmap_field *reg_als_rate;
 165         struct regmap_field *reg_ps_rate;
 166         struct regmap_field *reg_als_prst;
 167         struct regmap_field *reg_ps_prst;
 168         uint32_t near_level;
 169 };
 170
 171 static const struct ltr501_samp_table ltr501_als_samp_table[] = {
 172                         {20000000, 50000}, {10000000, 100000},
 173                         {5000000, 200000}, {2000000, 500000},
 174                         {1000000, 1000000}, {500000, 2000000},
 175                         {500000, 2000000}, {500000, 2000000}
 176 };
 177
 178 static const struct ltr501_samp_table ltr501_ps_samp_table[] = {
 179                         {20000000, 50000}, {14285714, 70000},
 180                         {10000000, 100000}, {5000000, 200000},
 181                         {2000000, 500000}, {1000000, 1000000},
 182                         {500000, 2000000}, {500000, 2000000},
 183                         {500000, 2000000}
 184 };
 185
 186 static int ltr501_match_samp_freq(const struct ltr501_samp_table *tab,
 187                                            int len, int val, int val2)
 188 {
 189         int i, freq;
 190
 191         freq = val * 1000000 + val2;
 192
 193         for (i = 0; i < len; i++) {
 194                 if (tab[i].freq_val == freq)
 195                         return i;
 196         }
 197
 198         return -EINVAL;
 199 }
 200
 201 static int ltr501_als_read_samp_freq(const struct ltr501_data *data,
 202                                      int *val, int *val2)
 203 {
 204         int ret, i;
 205
 206         ret = regmap_field_read(data->reg_als_rate, &i);
 207         if (ret < 0)
 208                 return ret;
 209
 210         if (i < 0 || i >= ARRAY_SIZE(ltr501_als_samp_table))
 211                 return -EINVAL;
 212
 213         *val = ltr501_als_samp_table[i].freq_val / 1000000;
 214         *val2 = ltr501_als_samp_table[i].freq_val % 1000000;
 215
 216         return IIO_VAL_INT_PLUS_MICRO;
 217 }
 218
 219 static int ltr501_ps_read_samp_freq(const struct ltr501_data *data,
 220                                     int *val, int *val2)
 221 {
 222         int ret, i;
 223
 224         ret = regmap_field_read(data->reg_ps_rate, &i);
 225         if (ret < 0)
 226                 return ret;
 227
 228         if (i < 0 || i >= ARRAY_SIZE(ltr501_ps_samp_table))
 229                 return -EINVAL;
 230
 231         *val = ltr501_ps_samp_table[i].freq_val / 1000000;
 232         *val2 = ltr501_ps_samp_table[i].freq_val % 1000000;
 233
 234         return IIO_VAL_INT_PLUS_MICRO;
 235 }
 236
 237 static int ltr501_als_write_samp_freq(struct ltr501_data *data,
 238                                       int val, int val2)
 239 {
 240         int i, ret;
 241
 242         i = ltr501_match_samp_freq(ltr501_als_samp_table,
 243                                    ARRAY_SIZE(ltr501_als_samp_table),
 244                                    val, val2);
 245
 246         if (i < 0)
 247                 return i;
 248
 249         mutex_lock(&data->lock_als);
 250         ret = regmap_field_write(data->reg_als_rate, i);
 251         mutex_unlock(&data->lock_als);
 252
 253         return ret;
 254 }
 255
 256 static int ltr501_ps_write_samp_freq(struct ltr501_data *data,
 257                                      int val, int val2)
 258 {
 259         int i, ret;
 260
 261         i = ltr501_match_samp_freq(ltr501_ps_samp_table,
 262                                    ARRAY_SIZE(ltr501_ps_samp_table),
 263                                    val, val2);
 264
 265         if (i < 0)
 266                 return i;
 267
 268         mutex_lock(&data->lock_ps);
 269         ret = regmap_field_write(data->reg_ps_rate, i);
 270         mutex_unlock(&data->lock_ps);
 271
 272         return ret;
 273 }
 274
 275 static int ltr501_als_read_samp_period(const struct ltr501_data *data, int *val)
 276 {
 277         int ret, i;
 278
 279         ret = regmap_field_read(data->reg_als_rate, &i);
 280         if (ret < 0)
 281                 return ret;
 282
 283         if (i < 0 || i >= ARRAY_SIZE(ltr501_als_samp_table))
 284                 return -EINVAL;
 285
 286         *val = ltr501_als_samp_table[i].time_val;
 287
 288         return IIO_VAL_INT;
 289 }
 290
 291 static int ltr501_ps_read_samp_period(const struct ltr501_data *data, int *val)
 292 {
 293         int ret, i;
 294
 295         ret = regmap_field_read(data->reg_ps_rate, &i);
 296         if (ret < 0)
 297                 return ret;
 298
 299         if (i < 0 || i >= ARRAY_SIZE(ltr501_ps_samp_table))
 300                 return -EINVAL;
 301
 302         *val = ltr501_ps_samp_table[i].time_val;
 303
 304         return IIO_VAL_INT;
 305 }
 306
 307 /* IR and visible spectrum coeff's are given in data sheet */
 308 static unsigned long ltr501_calculate_lux(u16 vis_data, u16 ir_data)
 309 {
 310         unsigned long ratio, lux;
 311
 312         if (vis_data == 0)
 313                 return 0;
 314
 315         /* multiply numerator by 100 to avoid handling ratio < 1 */
 316         ratio = DIV_ROUND_UP(ir_data * 100, ir_data + vis_data);
 317
 318         if (ratio < 45)
 319                 lux = LTR501_LUX_CONV(1774, vis_data, -1105, ir_data);
 320         else if (ratio >= 45 && ratio < 64)
 321                 lux = LTR501_LUX_CONV(3772, vis_data, 1336, ir_data);
 322         else if (ratio >= 64 && ratio < 85)
 323                 lux = LTR501_LUX_CONV(1690, vis_data, 169, ir_data);
 324         else
 325                 lux = 0;
 326
 327         return lux / 1000;
 328 }
 329
 330 static int ltr501_drdy(const struct ltr501_data *data, u8 drdy_mask)
 331 {
 332         int tries = 100;
 333         int ret, status;
 334
 335         while (tries--) {
 336                 ret = regmap_read(data->regmap, LTR501_ALS_PS_STATUS, &status);
 337                 if (ret < 0)
 338                         return ret;
 339                 if ((status & drdy_mask) == drdy_mask)
 340                         return 0;
 341                 msleep(25);
 342         }
 343
 344         dev_err(&data->client->dev, "ltr501_drdy() failed, data not ready\n");
 345         return -EIO;
 346 }
 347
 348 static int ltr501_set_it_time(struct ltr501_data *data, int it)
 349 {
 350         int ret, i, index = -1, status;
 351
 352         for (i = 0; i < ARRAY_SIZE(int_time_mapping); i++) {
 353                 if (int_time_mapping[i] == it) {
 354                         index = i;
 355                         break;
 356                 }
 357         }
 358         /* Make sure integ time index is valid */
 359         if (index < 0)
 360                 return -EINVAL;
 361
 362         ret = regmap_read(data->regmap, LTR501_ALS_CONTR, &status);
 363         if (ret < 0)
 364                 return ret;
 365
 366         if (status & LTR501_CONTR_ALS_GAIN_MASK) {
 367                 /*
 368                  * 200 ms and 400 ms integ time can only be
 369                  * used in dynamic range 1
 370                  */
 371                 if (index > 1)
 372                         return -EINVAL;
 373         } else
 374                 /* 50 ms integ time can only be used in dynamic range 2 */
 375                 if (index == 1)
 376                         return -EINVAL;
 377
 378         return regmap_field_write(data->reg_it, index);
 379 }
 380
 381 /* read int time in micro seconds */
 382 static int ltr501_read_it_time(const struct ltr501_data *data,
 383                                int *val, int *val2)
 384 {
 385         int ret, index;
 386
 387         ret = regmap_field_read(data->reg_it, &index);
 388         if (ret < 0)
 389                 return ret;
 390
 391         /* Make sure integ time index is valid */
 392         if (index < 0 || index >= ARRAY_SIZE(int_time_mapping))
 393                 return -EINVAL;
 394
 395         *val2 = int_time_mapping[index];
 396         *val = 0;
 397
 398         return IIO_VAL_INT_PLUS_MICRO;
 399 }
 400
 401 static int ltr501_read_als(const struct ltr501_data *data, __le16 buf[2])
 402 {
 403         int ret;
 404
 405         ret = ltr501_drdy(data, LTR501_STATUS_ALS_RDY);
 406         if (ret < 0)
 407                 return ret;
 408         /* always read both ALS channels in given order */
 409         return regmap_bulk_read(data->regmap, LTR501_ALS_DATA1,
 410                                 buf, 2 * sizeof(__le16));
 411 }
 412
 413 static int ltr501_read_ps(const struct ltr501_data *data)
 414 {
 415         __le16 status;
 416         int ret;
 417
 418         ret = ltr501_drdy(data, LTR501_STATUS_PS_RDY);
 419         if (ret < 0)
 420                 return ret;
 421
 422         ret = regmap_bulk_read(data->regmap, LTR501_PS_DATA,
 423                                &status, sizeof(status));
 424         if (ret < 0)
 425                 return ret;
 426
 427         return le16_to_cpu(status);
 428 }
 429
 430 static int ltr501_read_intr_prst(const struct ltr501_data *data,
 431                                  enum iio_chan_type type,
 432                                  int *val2)
 433 {
 434         int ret, samp_period, prst;
 435
 436         switch (type) {
 437         case IIO_INTENSITY:
 438                 ret = regmap_field_read(data->reg_als_prst, &prst);
 439                 if (ret < 0)
 440                         return ret;
 441
 442                 ret = ltr501_als_read_samp_period(data, &samp_period);
 443
 444                 if (ret < 0)
 445                         return ret;
 446                 *val2 = samp_period * prst;
 447                 return IIO_VAL_INT_PLUS_MICRO;
 448         case IIO_PROXIMITY:
 449                 ret = regmap_field_read(data->reg_ps_prst, &prst);
 450                 if (ret < 0)
 451                         return ret;
 452
 453                 ret = ltr501_ps_read_samp_period(data, &samp_period);
 454
 455                 if (ret < 0)
 456                         return ret;
 457
 458                 *val2 = samp_period * prst;
 459                 return IIO_VAL_INT_PLUS_MICRO;
 460         default:
 461                 return -EINVAL;
 462         }
 463
 464         return -EINVAL;
 465 }
 466
 467 static int ltr501_write_intr_prst(struct ltr501_data *data,
 468                                   enum iio_chan_type type,
 469                                   int val, int val2)
 470 {
 471         int ret, samp_period, new_val;
 472         unsigned long period;
 473
 474         if (val < 0 || val2 < 0)
 475                 return -EINVAL;
 476
 477         /* period in microseconds */
 478         period = ((val * 1000000) + val2);
 479
 480         switch (type) {
 481         case IIO_INTENSITY:
 482                 ret = ltr501_als_read_samp_period(data, &samp_period);
 483                 if (ret < 0)
 484                         return ret;
 485
 486                 /* period should be atleast equal to sampling period */
 487                 if (period < samp_period)
 488                         return -EINVAL;
 489
 490                 new_val = DIV_ROUND_UP(period, samp_period);
 491                 if (new_val < 0 || new_val > 0x0f)
 492                         return -EINVAL;
 493
 494                 mutex_lock(&data->lock_als);
 495                 ret = regmap_field_write(data->reg_als_prst, new_val);
 496                 mutex_unlock(&data->lock_als);
 497                 if (ret >= 0)
 498                         data->als_period = period;
 499
 500                 return ret;
 501         case IIO_PROXIMITY:
 502                 ret = ltr501_ps_read_samp_period(data, &samp_period);
 503                 if (ret < 0)
 504                         return ret;
 505
 506                 /* period should be atleast equal to rate */
 507                 if (period < samp_period)
 508                         return -EINVAL;
 509
 510                 new_val = DIV_ROUND_UP(period, samp_period);
 511                 if (new_val < 0 || new_val > 0x0f)
 512                         return -EINVAL;
 513
 514                 mutex_lock(&data->lock_ps);
 515                 ret = regmap_field_write(data->reg_ps_prst, new_val);
 516                 mutex_unlock(&data->lock_ps);
 517                 if (ret >= 0)
 518                         data->ps_period = period;
 519
 520                 return ret;
 521         default:
 522                 return -EINVAL;
 523         }
 524
 525         return -EINVAL;
 526 }
 527
 528 static ssize_t ltr501_read_near_level(struct iio_dev *indio_dev,
 529                                       uintptr_t priv,
 530                                       const struct iio_chan_spec *chan,
 531                                       char *buf)
 532 {
 533         struct ltr501_data *data = iio_priv(indio_dev);
 534
 535         return sprintf(buf, "%u\n", data->near_level);
 536 }
 537
 538 static const struct iio_chan_spec_ext_info ltr501_ext_info[] = {
 539         {
 540                 .name = "nearlevel",
 541                 .shared = IIO_SEPARATE,
 542                 .read = ltr501_read_near_level,
 543         },
 544         { /* sentinel */ }
 545 };
 546
 547 static const struct iio_event_spec ltr501_als_event_spec[] = {
 548         {
 549                 .type = IIO_EV_TYPE_THRESH,
 550                 .dir = IIO_EV_DIR_RISING,
 551                 .mask_separate = BIT(IIO_EV_INFO_VALUE),
 552         }, {
 553                 .type = IIO_EV_TYPE_THRESH,
 554                 .dir = IIO_EV_DIR_FALLING,
 555                 .mask_separate = BIT(IIO_EV_INFO_VALUE),
 556         }, {
 557                 .type = IIO_EV_TYPE_THRESH,
 558                 .dir = IIO_EV_DIR_EITHER,
 559                 .mask_separate = BIT(IIO_EV_INFO_ENABLE) |
 560                                  BIT(IIO_EV_INFO_PERIOD),
 561         },
 562
 563 };
 564
 565 static const struct iio_event_spec ltr501_pxs_event_spec[] = {
 566         {
 567                 .type = IIO_EV_TYPE_THRESH,
 568                 .dir = IIO_EV_DIR_RISING,
 569                 .mask_separate = BIT(IIO_EV_INFO_VALUE),
 570         }, {
 571                 .type = IIO_EV_TYPE_THRESH,
 572                 .dir = IIO_EV_DIR_FALLING,
 573                 .mask_separate = BIT(IIO_EV_INFO_VALUE),
 574         }, {
 575                 .type = IIO_EV_TYPE_THRESH,
 576                 .dir = IIO_EV_DIR_EITHER,
 577                 .mask_separate = BIT(IIO_EV_INFO_ENABLE) |
 578                                  BIT(IIO_EV_INFO_PERIOD),
 579         },
 580 };
 581
 582 #define LTR501_INTENSITY_CHANNEL(_idx, _addr, _mod, _shared, \
 583                                  _evspec, _evsize) { \
 584         .type = IIO_INTENSITY, \
 585         .modified = 1, \
 586         .address = (_addr), \
 587         .channel2 = (_mod), \
 588         .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \
 589         .info_mask_shared_by_type = (_shared), \
 590         .scan_index = (_idx), \
 591         .scan_type = { \
 592                 .sign = 'u', \
 593                 .realbits = 16, \
 594                 .storagebits = 16, \
 595                 .endianness = IIO_CPU, \
 596         }, \
 597         .event_spec = _evspec,\
 598         .num_event_specs = _evsize,\
 599 }
 600
 601 #define LTR501_LIGHT_CHANNEL() { \
 602         .type = IIO_LIGHT, \
 603         .info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED), \
 604         .scan_index = -1, \
 605 }
 606
 607 static const struct iio_chan_spec ltr501_channels[] = {
 608         LTR501_LIGHT_CHANNEL(),
 609         LTR501_INTENSITY_CHANNEL(0, LTR501_ALS_DATA0, IIO_MOD_LIGHT_BOTH, 0,
 610                                  ltr501_als_event_spec,
 611                                  ARRAY_SIZE(ltr501_als_event_spec)),
 612         LTR501_INTENSITY_CHANNEL(1, LTR501_ALS_DATA1, IIO_MOD_LIGHT_IR,
 613                                  BIT(IIO_CHAN_INFO_SCALE) |
 614                                  BIT(IIO_CHAN_INFO_INT_TIME) |
 615                                  BIT(IIO_CHAN_INFO_SAMP_FREQ),
 616                                  NULL, 0),
 617         {
 618                 .type = IIO_PROXIMITY,
 619                 .address = LTR501_PS_DATA,
 620                 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
 621                         BIT(IIO_CHAN_INFO_SCALE),
 622                 .scan_index = 2,
 623                 .scan_type = {
 624                         .sign = 'u',
 625                         .realbits = 11,
 626                         .storagebits = 16,
 627                         .endianness = IIO_CPU,
 628                 },
 629                 .event_spec = ltr501_pxs_event_spec,
 630                 .num_event_specs = ARRAY_SIZE(ltr501_pxs_event_spec),
 631                 .ext_info = ltr501_ext_info,
 632         },
 633         IIO_CHAN_SOFT_TIMESTAMP(3),
 634 };
 635
 636 static const struct iio_chan_spec ltr301_channels[] = {
 637         LTR501_LIGHT_CHANNEL(),
 638         LTR501_INTENSITY_CHANNEL(0, LTR501_ALS_DATA0, IIO_MOD_LIGHT_BOTH, 0,
 639                                  ltr501_als_event_spec,
 640                                  ARRAY_SIZE(ltr501_als_event_spec)),
 641         LTR501_INTENSITY_CHANNEL(1, LTR501_ALS_DATA1, IIO_MOD_LIGHT_IR,
 642                                  BIT(IIO_CHAN_INFO_SCALE) |
 643                                  BIT(IIO_CHAN_INFO_INT_TIME) |
 644                                  BIT(IIO_CHAN_INFO_SAMP_FREQ),
 645                                  NULL, 0),
 646         IIO_CHAN_SOFT_TIMESTAMP(2),
 647 };
 648
 649 static int ltr501_read_raw(struct iio_dev *indio_dev,
 650                            struct iio_chan_spec const *chan,
 651                            int *val, int *val2, long mask)
 652 {
 653         struct ltr501_data *data = iio_priv(indio_dev);
 654         __le16 buf[2];
 655         int ret, i;
 656
 657         switch (mask) {
 658         case IIO_CHAN_INFO_PROCESSED:
 659                 switch (chan->type) {
 660                 case IIO_LIGHT:
 661                         ret = iio_device_claim_direct_mode(indio_dev);
 662                         if (ret)
 663                                 return ret;
 664
 665                         mutex_lock(&data->lock_als);
 666                         ret = ltr501_read_als(data, buf);
 667                         mutex_unlock(&data->lock_als);
 668                         iio_device_release_direct_mode(indio_dev);
 669                         if (ret < 0)
 670                                 return ret;
 671                         *val = ltr501_calculate_lux(le16_to_cpu(buf[1]),
 672                                                     le16_to_cpu(buf[0]));
 673                         return IIO_VAL_INT;
 674                 default:
 675                         return -EINVAL;
 676                 }
 677         case IIO_CHAN_INFO_RAW:
 678                 ret = iio_device_claim_direct_mode(indio_dev);
 679                 if (ret)
 680                         return ret;
 681
 682                 switch (chan->type) {
 683                 case IIO_INTENSITY:
 684                         mutex_lock(&data->lock_als);
 685                         ret = ltr501_read_als(data, buf);
 686                         mutex_unlock(&data->lock_als);
 687                         if (ret < 0)
 688                                 break;
 689                         *val = le16_to_cpu(chan->address == LTR501_ALS_DATA1 ?
 690                                            buf[0] : buf[1]);
 691                         ret = IIO_VAL_INT;
 692                         break;
 693                 case IIO_PROXIMITY:
 694                         mutex_lock(&data->lock_ps);
 695                         ret = ltr501_read_ps(data);
 696                         mutex_unlock(&data->lock_ps);
 697                         if (ret < 0)
 698                                 break;
 699                         *val = ret & LTR501_PS_DATA_MASK;
 700                         ret = IIO_VAL_INT;
 701                         break;
 702                 default:
 703                         ret = -EINVAL;
 704                         break;
 705                 }
 706
 707                 iio_device_release_direct_mode(indio_dev);
 708                 return ret;
 709
 710         case IIO_CHAN_INFO_SCALE:
 711                 switch (chan->type) {
 712                 case IIO_INTENSITY:
 713                         i = (data->als_contr & data->chip_info->als_gain_mask)
 714                              >> data->chip_info->als_gain_shift;
 715                         *val = data->chip_info->als_gain[i].scale;
 716                         *val2 = data->chip_info->als_gain[i].uscale;
 717                         return IIO_VAL_INT_PLUS_MICRO;
 718                 case IIO_PROXIMITY:
 719                         i = (data->ps_contr & LTR501_CONTR_PS_GAIN_MASK) >>
 720                                 LTR501_CONTR_PS_GAIN_SHIFT;
 721                         *val = data->chip_info->ps_gain[i].scale;
 722                         *val2 = data->chip_info->ps_gain[i].uscale;
 723                         return IIO_VAL_INT_PLUS_MICRO;
 724                 default:
 725                         return -EINVAL;
 726                 }
 727         case IIO_CHAN_INFO_INT_TIME:
 728                 switch (chan->type) {
 729                 case IIO_INTENSITY:
 730                         return ltr501_read_it_time(data, val, val2);
 731                 default:
 732                         return -EINVAL;
 733                 }
 734         case IIO_CHAN_INFO_SAMP_FREQ:
 735                 switch (chan->type) {
 736                 case IIO_INTENSITY:
 737                         return ltr501_als_read_samp_freq(data, val, val2);
 738                 case IIO_PROXIMITY:
 739                         return ltr501_ps_read_samp_freq(data, val, val2);
 740                 default:
 741                         return -EINVAL;
 742                 }
 743         }
 744         return -EINVAL;
 745 }
 746
 747 static int ltr501_get_gain_index(const struct ltr501_gain *gain, int size,
 748                                  int val, int val2)
 749 {
 750         int i;
 751
 752         for (i = 0; i < size; i++)
 753                 if (val == gain[i].scale && val2 == gain[i].uscale)
 754                         return i;
 755
 756         return -1;
 757 }
 758
 759 static int ltr501_write_raw(struct iio_dev *indio_dev,
 760                             struct iio_chan_spec const *chan,
 761                             int val, int val2, long mask)
 762 {
 763         struct ltr501_data *data = iio_priv(indio_dev);
 764         int i, ret, freq_val, freq_val2;
 765         const struct ltr501_chip_info *info = data->chip_info;
 766
 767         ret = iio_device_claim_direct_mode(indio_dev);
 768         if (ret)
 769                 return ret;
 770
 771         switch (mask) {
 772         case IIO_CHAN_INFO_SCALE:
 773                 switch (chan->type) {
 774                 case IIO_INTENSITY:
 775                         i = ltr501_get_gain_index(info->als_gain,
 776                                                   info->als_gain_tbl_size,
 777                                                   val, val2);
 778                         if (i < 0) {
 779                                 ret = -EINVAL;
 780                                 break;
 781                         }
 782
 783                         data->als_contr &= ~info->als_gain_mask;
 784                         data->als_contr |= i << info->als_gain_shift;
 785
 786                         ret = regmap_write(data->regmap, LTR501_ALS_CONTR,
 787                                            data->als_contr);
 788                         break;
 789                 case IIO_PROXIMITY:
 790                         i = ltr501_get_gain_index(info->ps_gain,
 791                                                   info->ps_gain_tbl_size,
 792                                                   val, val2);
 793                         if (i < 0) {
 794                                 ret = -EINVAL;
 795                                 break;
 796                         }
 797                         data->ps_contr &= ~LTR501_CONTR_PS_GAIN_MASK;
 798                         data->ps_contr |= i << LTR501_CONTR_PS_GAIN_SHIFT;
 799
 800                         ret = regmap_write(data->regmap, LTR501_PS_CONTR,
 801                                            data->ps_contr);
 802                         break;
 803                 default:
 804                         ret = -EINVAL;
 805                         break;
 806                 }
 807                 break;
 808
 809         case IIO_CHAN_INFO_INT_TIME:
 810                 switch (chan->type) {
 811                 case IIO_INTENSITY:
 812                         if (val != 0) {
 813                                 ret = -EINVAL;
 814                                 break;
 815                         }
 816                         mutex_lock(&data->lock_als);
 817                         ret = ltr501_set_it_time(data, val2);
 818                         mutex_unlock(&data->lock_als);
 819                         break;
 820                 default:
 821                         ret = -EINVAL;
 822                         break;
 823                 }
 824                 break;
 825
 826         case IIO_CHAN_INFO_SAMP_FREQ:
 827                 switch (chan->type) {
 828                 case IIO_INTENSITY:
 829                         ret = ltr501_als_read_samp_freq(data, &freq_val,
 830                                                         &freq_val2);
 831                         if (ret < 0)
 832                                 break;
 833
 834                         ret = ltr501_als_write_samp_freq(data, val, val2);
 835                         if (ret < 0)
 836                                 break;
 837
 838                         /* update persistence count when changing frequency */
 839                         ret = ltr501_write_intr_prst(data, chan->type,
 840                                                      0, data->als_period);
 841
 842                         if (ret < 0)
 843                                 ret = ltr501_als_write_samp_freq(data, freq_val,
 844                                                                  freq_val2);
 845                         break;
 846                 case IIO_PROXIMITY:
 847                         ret = ltr501_ps_read_samp_freq(data, &freq_val,
 848                                                        &freq_val2);
 849                         if (ret < 0)
 850                                 break;
 851
 852                         ret = ltr501_ps_write_samp_freq(data, val, val2);
 853                         if (ret < 0)
 854                                 break;
 855
 856                         /* update persistence count when changing frequency */
 857                         ret = ltr501_write_intr_prst(data, chan->type,
 858                                                      0, data->ps_period);
 859
 860                         if (ret < 0)
 861                                 ret = ltr501_ps_write_samp_freq(data, freq_val,
 862                                                                 freq_val2);
 863                         break;
 864                 default:
 865                         ret = -EINVAL;
 866                         break;
 867                 }
 868                 break;
 869
 870         default:
 871                 ret = -EINVAL;
 872                 break;
 873         }
 874
 875         iio_device_release_direct_mode(indio_dev);
 876         return ret;
 877 }
 878
 879 static int ltr501_read_thresh(const struct iio_dev *indio_dev,
 880                               const struct iio_chan_spec *chan,
 881                               enum iio_event_type type,
 882                               enum iio_event_direction dir,
 883                               enum iio_event_info info,
 884                               int *val, int *val2)
 885 {
 886         const struct ltr501_data *data = iio_priv(indio_dev);
 887         int ret, thresh_data;
 888
 889         switch (chan->type) {
 890         case IIO_INTENSITY:
 891                 switch (dir) {
 892                 case IIO_EV_DIR_RISING:
 893                         ret = regmap_bulk_read(data->regmap,
 894                                                LTR501_ALS_THRESH_UP,
 895                                                &thresh_data, 2);
 896                         if (ret < 0)
 897                                 return ret;
 898                         *val = thresh_data & LTR501_ALS_THRESH_MASK;
 899                         return IIO_VAL_INT;
 900                 case IIO_EV_DIR_FALLING:
 901                         ret = regmap_bulk_read(data->regmap,
 902                                                LTR501_ALS_THRESH_LOW,
 903                                                &thresh_data, 2);
 904                         if (ret < 0)
 905                                 return ret;
 906                         *val = thresh_data & LTR501_ALS_THRESH_MASK;
 907                         return IIO_VAL_INT;
 908                 default:
 909                         return -EINVAL;
 910                 }
 911         case IIO_PROXIMITY:
 912                 switch (dir) {
 913                 case IIO_EV_DIR_RISING:
 914                         ret = regmap_bulk_read(data->regmap,
 915                                                LTR501_PS_THRESH_UP,
 916                                                &thresh_data, 2);
 917                         if (ret < 0)
 918                                 return ret;
 919                         *val = thresh_data & LTR501_PS_THRESH_MASK;
 920                         return IIO_VAL_INT;
 921                 case IIO_EV_DIR_FALLING:
 922                         ret = regmap_bulk_read(data->regmap,
 923                                                LTR501_PS_THRESH_LOW,
 924                                                &thresh_data, 2);
 925                         if (ret < 0)
 926                                 return ret;
 927                         *val = thresh_data & LTR501_PS_THRESH_MASK;
 928                         return IIO_VAL_INT;
 929                 default:
 930                         return -EINVAL;
 931                 }
 932         default:
 933                 return -EINVAL;
 934         }
 935
 936         return -EINVAL;
 937 }
 938
 939 static int ltr501_write_thresh(struct iio_dev *indio_dev,
 940                                const struct iio_chan_spec *chan,
 941                                enum iio_event_type type,
 942                                enum iio_event_direction dir,
 943                                enum iio_event_info info,
 944                                int val, int val2)
 945 {
 946         struct ltr501_data *data = iio_priv(indio_dev);
 947         int ret;
 948
 949         if (val < 0)
 950                 return -EINVAL;
 951
 952         switch (chan->type) {
 953         case IIO_INTENSITY:
 954                 if (val > LTR501_ALS_THRESH_MASK)
 955                         return -EINVAL;
 956                 switch (dir) {
 957                 case IIO_EV_DIR_RISING:
 958                         mutex_lock(&data->lock_als);
 959                         ret = regmap_bulk_write(data->regmap,
 960                                                 LTR501_ALS_THRESH_UP,
 961                                                 &val, 2);
 962                         mutex_unlock(&data->lock_als);
 963                         return ret;
 964                 case IIO_EV_DIR_FALLING:
 965                         mutex_lock(&data->lock_als);
 966                         ret = regmap_bulk_write(data->regmap,
 967                                                 LTR501_ALS_THRESH_LOW,
 968                                                 &val, 2);
 969                         mutex_unlock(&data->lock_als);
 970                         return ret;
 971                 default:
 972                         return -EINVAL;
 973                 }
 974         case IIO_PROXIMITY:
 975                 if (val > LTR501_PS_THRESH_MASK)
 976                         return -EINVAL;
 977                 switch (dir) {
 978                 case IIO_EV_DIR_RISING:
 979                         mutex_lock(&data->lock_ps);
 980                         ret = regmap_bulk_write(data->regmap,
 981                                                 LTR501_PS_THRESH_UP,
 982                                                 &val, 2);
 983                         mutex_unlock(&data->lock_ps);
 984                         return ret;
 985                 case IIO_EV_DIR_FALLING:
 986                         mutex_lock(&data->lock_ps);
 987                         ret = regmap_bulk_write(data->regmap,
 988                                                 LTR501_PS_THRESH_LOW,
 989                                                 &val, 2);
 990                         mutex_unlock(&data->lock_ps);
 991                         return ret;
 992                 default:
 993                         return -EINVAL;
 994                 }
 995         default:
 996                 return -EINVAL;
 997         }
 998
 999         return -EINVAL;
1000 }
1001
1002 static int ltr501_read_event(struct iio_dev *indio_dev,
1003                              const struct iio_chan_spec *chan,
1004                              enum iio_event_type type,
1005                              enum iio_event_direction dir,
1006                              enum iio_event_info info,
1007                              int *val, int *val2)
1008 {
1009         int ret;
1010
1011         switch (info) {
1012         case IIO_EV_INFO_VALUE:
1013                 return ltr501_read_thresh(indio_dev, chan, type, dir,
1014                                           info, val, val2);
1015         case IIO_EV_INFO_PERIOD:
1016                 ret = ltr501_read_intr_prst(iio_priv(indio_dev),
1017                                             chan->type, val2);
1018                 *val = *val2 / 1000000;
1019                 *val2 = *val2 % 1000000;
1020                 return ret;
1021         default:
1022                 return -EINVAL;
1023         }
1024
1025         return -EINVAL;
1026 }
1027
1028 static int ltr501_write_event(struct iio_dev *indio_dev,
1029                               const struct iio_chan_spec *chan,
1030                               enum iio_event_type type,
1031                               enum iio_event_direction dir,
1032                               enum iio_event_info info,
1033                               int val, int val2)
1034 {
1035         switch (info) {
1036         case IIO_EV_INFO_VALUE:
1037                 if (val2 != 0)
1038                         return -EINVAL;
1039                 return ltr501_write_thresh(indio_dev, chan, type, dir,
1040                                            info, val, val2);
1041         case IIO_EV_INFO_PERIOD:
1042                 return ltr501_write_intr_prst(iio_priv(indio_dev), chan->type,
1043                                               val, val2);
1044         default:
1045                 return -EINVAL;
1046         }
1047
1048         return -EINVAL;
1049 }
1050
1051 static int ltr501_read_event_config(struct iio_dev *indio_dev,
1052                                     const struct iio_chan_spec *chan,
1053                                     enum iio_event_type type,
1054                                     enum iio_event_direction dir)
1055 {
1056         struct ltr501_data *data = iio_priv(indio_dev);
1057         int ret, status;
1058
1059         switch (chan->type) {
1060         case IIO_INTENSITY:
1061                 ret = regmap_field_read(data->reg_als_intr, &status);
1062                 if (ret < 0)
1063                         return ret;
1064                 return status;
1065         case IIO_PROXIMITY:
1066                 ret = regmap_field_read(data->reg_ps_intr, &status);
1067                 if (ret < 0)
1068                         return ret;
1069                 return status;
1070         default:
1071                 return -EINVAL;
1072         }
1073
1074         return -EINVAL;
1075 }
1076
1077 static int ltr501_write_event_config(struct iio_dev *indio_dev,
1078                                      const struct iio_chan_spec *chan,
1079                                      enum iio_event_type type,
1080                                      enum iio_event_direction dir, int state)
1081 {
1082         struct ltr501_data *data = iio_priv(indio_dev);
1083         int ret;
1084
1085         /* only 1 and 0 are valid inputs */
1086         if (state != 1  && state != 0)
1087                 return -EINVAL;
1088
1089         switch (chan->type) {
1090         case IIO_INTENSITY:
1091                 mutex_lock(&data->lock_als);
1092                 ret = regmap_field_write(data->reg_als_intr, state);
1093                 mutex_unlock(&data->lock_als);
1094                 return ret;
1095         case IIO_PROXIMITY:
1096                 mutex_lock(&data->lock_ps);
1097                 ret = regmap_field_write(data->reg_ps_intr, state);
1098                 mutex_unlock(&data->lock_ps);
1099                 return ret;
1100         default:
1101                 return -EINVAL;
1102         }
1103
1104         return -EINVAL;
1105 }
1106
1107 static ssize_t ltr501_show_proximity_scale_avail(struct device *dev,
1108                                                  struct device_attribute *attr,
1109                                                  char *buf)
1110 {
1111         struct ltr501_data *data = iio_priv(dev_to_iio_dev(dev));
1112         const struct ltr501_chip_info *info = data->chip_info;
1113         ssize_t len = 0;
1114         int i;
1115
1116         for (i = 0; i < info->ps_gain_tbl_size; i++) {
1117                 if (info->ps_gain[i].scale == LTR501_RESERVED_GAIN)
1118                         continue;
1119                 len += scnprintf(buf + len, PAGE_SIZE - len, "%d.%06d ",
1120                                  info->ps_gain[i].scale,
1121                                  info->ps_gain[i].uscale);
1122         }
1123
1124         buf[len - 1] = '\n';
1125
1126         return len;
1127 }
1128
1129 static ssize_t ltr501_show_intensity_scale_avail(struct device *dev,
1130                                                  struct device_attribute *attr,
1131                                                  char *buf)
1132 {
1133         struct ltr501_data *data = iio_priv(dev_to_iio_dev(dev));
1134         const struct ltr501_chip_info *info = data->chip_info;
1135         ssize_t len = 0;
1136         int i;
1137
1138         for (i = 0; i < info->als_gain_tbl_size; i++) {
1139                 if (info->als_gain[i].scale == LTR501_RESERVED_GAIN)
1140                         continue;
1141                 len += scnprintf(buf + len, PAGE_SIZE - len, "%d.%06d ",
1142                                  info->als_gain[i].scale,
1143                                  info->als_gain[i].uscale);
1144         }
1145
1146         buf[len - 1] = '\n';
1147
1148         return len;
1149 }
1150
1151 static IIO_CONST_ATTR_INT_TIME_AVAIL("0.05 0.1 0.2 0.4");
1152 static IIO_CONST_ATTR_SAMP_FREQ_AVAIL("20 10 5 2 1 0.5");
1153
1154 static IIO_DEVICE_ATTR(in_proximity_scale_available, S_IRUGO,
1155                        ltr501_show_proximity_scale_avail, NULL, 0);
1156 static IIO_DEVICE_ATTR(in_intensity_scale_available, S_IRUGO,
1157                        ltr501_show_intensity_scale_avail, NULL, 0);
1158
1159 static struct attribute *ltr501_attributes[] = {
1160         &iio_dev_attr_in_proximity_scale_available.dev_attr.attr,
1161         &iio_dev_attr_in_intensity_scale_available.dev_attr.attr,
1162         &iio_const_attr_integration_time_available.dev_attr.attr,
1163         &iio_const_attr_sampling_frequency_available.dev_attr.attr,
1164         NULL
1165 };
1166
1167 static struct attribute *ltr301_attributes[] = {
1168         &iio_dev_attr_in_intensity_scale_available.dev_attr.attr,
1169         &iio_const_attr_integration_time_available.dev_attr.attr,
1170         &iio_const_attr_sampling_frequency_available.dev_attr.attr,
1171         NULL
1172 };
1173
1174 static const struct attribute_group ltr501_attribute_group = {
1175         .attrs = ltr501_attributes,
1176 };
1177
1178 static const struct attribute_group ltr301_attribute_group = {
1179         .attrs = ltr301_attributes,
1180 };
1181
1182 static const struct iio_info ltr501_info_no_irq = {
1183         .read_raw = ltr501_read_raw,
1184         .write_raw = ltr501_write_raw,
1185         .attrs = &ltr501_attribute_group,
1186 };
1187
1188 static const struct iio_info ltr501_info = {
1189         .read_raw = ltr501_read_raw,
1190         .write_raw = ltr501_write_raw,
1191         .attrs = &ltr501_attribute_group,
1192         .read_event_value       = &ltr501_read_event,
1193         .write_event_value      = &ltr501_write_event,
1194         .read_event_config      = &ltr501_read_event_config,
1195         .write_event_config     = &ltr501_write_event_config,
1196 };
1197
1198 static const struct iio_info ltr301_info_no_irq = {
1199         .read_raw = ltr501_read_raw,
1200         .write_raw = ltr501_write_raw,
1201         .attrs = &ltr301_attribute_group,
1202 };
1203
1204 static const struct iio_info ltr301_info = {
1205         .read_raw = ltr501_read_raw,
1206         .write_raw = ltr501_write_raw,
1207         .attrs = &ltr301_attribute_group,
1208         .read_event_value       = &ltr501_read_event,
1209         .write_event_value      = &ltr501_write_event,
1210         .read_event_config      = &ltr501_read_event_config,
1211         .write_event_config     = &ltr501_write_event_config,
1212 };
1213
1214 static const struct ltr501_chip_info ltr501_chip_info_tbl[] = {
1215         [ltr501] = {
1216                 .partid = 0x08,
1217                 .als_gain = ltr501_als_gain_tbl,
1218                 .als_gain_tbl_size = ARRAY_SIZE(ltr501_als_gain_tbl),
1219                 .ps_gain = ltr501_ps_gain_tbl,
1220                 .ps_gain_tbl_size = ARRAY_SIZE(ltr501_ps_gain_tbl),
1221                 .als_mode_active = BIT(0) | BIT(1),
1222                 .als_gain_mask = BIT(3),
1223                 .als_gain_shift = 3,
1224                 .info = &ltr501_info,
1225                 .info_no_irq = &ltr501_info_no_irq,
1226                 .channels = ltr501_channels,
1227                 .no_channels = ARRAY_SIZE(ltr501_channels),
1228         },
1229         [ltr559] = {
1230                 .partid = 0x09,
1231                 .als_gain = ltr559_als_gain_tbl,
1232                 .als_gain_tbl_size = ARRAY_SIZE(ltr559_als_gain_tbl),
1233                 .ps_gain = ltr559_ps_gain_tbl,
1234                 .ps_gain_tbl_size = ARRAY_SIZE(ltr559_ps_gain_tbl),
1235                 .als_mode_active = BIT(0),
1236                 .als_gain_mask = BIT(2) | BIT(3) | BIT(4),
1237                 .als_gain_shift = 2,
1238                 .info = &ltr501_info,
1239                 .info_no_irq = &ltr501_info_no_irq,
1240                 .channels = ltr501_channels,
1241                 .no_channels = ARRAY_SIZE(ltr501_channels),
1242         },
1243         [ltr301] = {
1244                 .partid = 0x08,
1245                 .als_gain = ltr501_als_gain_tbl,
1246                 .als_gain_tbl_size = ARRAY_SIZE(ltr501_als_gain_tbl),
1247                 .als_mode_active = BIT(0) | BIT(1),
1248                 .als_gain_mask = BIT(3),
1249                 .als_gain_shift = 3,
1250                 .info = &ltr301_info,
1251                 .info_no_irq = &ltr301_info_no_irq,
1252                 .channels = ltr301_channels,
1253                 .no_channels = ARRAY_SIZE(ltr301_channels),
1254         },
1255         [ltr303] = {
1256                 .partid = 0x0A,
1257                 .als_gain = ltr559_als_gain_tbl,
1258                 .als_gain_tbl_size = ARRAY_SIZE(ltr559_als_gain_tbl),
1259                 .als_mode_active = BIT(0),
1260                 .als_gain_mask = BIT(2) | BIT(3) | BIT(4),
1261                 .als_gain_shift = 2,
1262                 .info = &ltr301_info,
1263                 .info_no_irq = &ltr301_info_no_irq,
1264                 .channels = ltr301_channels,
1265                 .no_channels = ARRAY_SIZE(ltr301_channels),
1266         },
1267 };
1268
1269 static int ltr501_write_contr(struct ltr501_data *data, u8 als_val, u8 ps_val)
1270 {
1271         int ret;
1272
1273         ret = regmap_write(data->regmap, LTR501_ALS_CONTR, als_val);
1274         if (ret < 0)
1275                 return ret;
1276
1277         return regmap_write(data->regmap, LTR501_PS_CONTR, ps_val);
1278 }
1279
1280 static irqreturn_t ltr501_trigger_handler(int irq, void *p)
1281 {
1282         struct iio_poll_func *pf = p;
1283         struct iio_dev *indio_dev = pf->indio_dev;
1284         struct ltr501_data *data = iio_priv(indio_dev);
1285         struct {
1286                 u16 channels[3];
1287                 s64 ts __aligned(8);
1288         } scan;
1289         __le16 als_buf[2];
1290         u8 mask = 0;
1291         int j = 0;
1292         int ret, psdata;
1293
1294         memset(&scan, 0, sizeof(scan));
1295
1296         /* figure out which data needs to be ready */
1297         if (test_bit(0, indio_dev->active_scan_mask) ||
1298             test_bit(1, indio_dev->active_scan_mask))
1299                 mask |= LTR501_STATUS_ALS_RDY;
1300         if (test_bit(2, indio_dev->active_scan_mask))
1301                 mask |= LTR501_STATUS_PS_RDY;
1302
1303         ret = ltr501_drdy(data, mask);
1304         if (ret < 0)
1305                 goto done;
1306
1307         if (mask & LTR501_STATUS_ALS_RDY) {
1308                 ret = regmap_bulk_read(data->regmap, LTR501_ALS_DATA1,
1309                                        als_buf, sizeof(als_buf));
1310                 if (ret < 0)
1311                         goto done;
1312                 if (test_bit(0, indio_dev->active_scan_mask))
1313                         scan.channels[j++] = le16_to_cpu(als_buf[1]);
1314                 if (test_bit(1, indio_dev->active_scan_mask))
1315                         scan.channels[j++] = le16_to_cpu(als_buf[0]);
1316         }
1317
1318         if (mask & LTR501_STATUS_PS_RDY) {
1319                 ret = regmap_bulk_read(data->regmap, LTR501_PS_DATA,
1320                                        &psdata, 2);
1321                 if (ret < 0)
1322                         goto done;
1323                 scan.channels[j++] = psdata & LTR501_PS_DATA_MASK;
1324         }
1325
1326         iio_push_to_buffers_with_timestamp(indio_dev, &scan,
1327                                            iio_get_time_ns(indio_dev));
1328
1329 done:
1330         iio_trigger_notify_done(indio_dev->trig);
1331
1332         return IRQ_HANDLED;
1333 }
1334
1335 static irqreturn_t ltr501_interrupt_handler(int irq, void *private)
1336 {
1337         struct iio_dev *indio_dev = private;
1338         struct ltr501_data *data = iio_priv(indio_dev);
1339         int ret, status;
1340
1341         ret = regmap_read(data->regmap, LTR501_ALS_PS_STATUS, &status);
1342         if (ret < 0) {
1343                 dev_err(&data->client->dev,
1344                         "irq read int reg failed\n");
1345                 return IRQ_HANDLED;
1346         }
1347
1348         if (status & LTR501_STATUS_ALS_INTR)
1349                 iio_push_event(indio_dev,
1350                                IIO_UNMOD_EVENT_CODE(IIO_INTENSITY, 0,
1351                                                     IIO_EV_TYPE_THRESH,
1352                                                     IIO_EV_DIR_EITHER),
1353                                iio_get_time_ns(indio_dev));
1354
1355         if (status & LTR501_STATUS_PS_INTR)
1356                 iio_push_event(indio_dev,
1357                                IIO_UNMOD_EVENT_CODE(IIO_PROXIMITY, 0,
1358                                                     IIO_EV_TYPE_THRESH,
1359                                                     IIO_EV_DIR_EITHER),
1360                                iio_get_time_ns(indio_dev));
1361
1362         return IRQ_HANDLED;
1363 }
1364
1365 static int ltr501_init(struct ltr501_data *data)
1366 {
1367         int ret, status;
1368
1369         ret = regmap_read(data->regmap, LTR501_ALS_CONTR, &status);
1370         if (ret < 0)
1371                 return ret;
1372
1373         data->als_contr = status | data->chip_info->als_mode_active;
1374
1375         ret = regmap_read(data->regmap, LTR501_PS_CONTR, &status);
1376         if (ret < 0)
1377                 return ret;
1378
1379         data->ps_contr = status | LTR501_CONTR_ACTIVE;
1380
1381         ret = ltr501_read_intr_prst(data, IIO_INTENSITY, &data->als_period);
1382         if (ret < 0)
1383                 return ret;
1384
1385         ret = ltr501_read_intr_prst(data, IIO_PROXIMITY, &data->ps_period);
1386         if (ret < 0)
1387                 return ret;
1388
1389         return ltr501_write_contr(data, data->als_contr, data->ps_contr);
1390 }
1391
1392 static bool ltr501_is_volatile_reg(struct device *dev, unsigned int reg)
1393 {
1394         switch (reg) {
1395         case LTR501_ALS_DATA1:
1396         case LTR501_ALS_DATA1_UPPER:
1397         case LTR501_ALS_DATA0:
1398         case LTR501_ALS_DATA0_UPPER:
1399         case LTR501_ALS_PS_STATUS:
1400         case LTR501_PS_DATA:
1401         case LTR501_PS_DATA_UPPER:
1402                 return true;
1403         default:
1404                 return false;
1405         }
1406 }
1407
1408 static const struct regmap_config ltr501_regmap_config = {
1409         .name =  LTR501_REGMAP_NAME,
1410         .reg_bits = 8,
1411         .val_bits = 8,
1412         .max_register = LTR501_MAX_REG,
1413         .cache_type = REGCACHE_RBTREE,
1414         .volatile_reg = ltr501_is_volatile_reg,
1415 };
1416
1417 static int ltr501_powerdown(struct ltr501_data *data)
1418 {
1419         return ltr501_write_contr(data, data->als_contr &
1420                                   ~data->chip_info->als_mode_active,
1421                                   data->ps_contr & ~LTR501_CONTR_ACTIVE);
1422 }
1423
1424 static const char *ltr501_match_acpi_device(struct device *dev, int *chip_idx)
1425 {
1426         const struct acpi_device_id *id;
1427
1428         id = acpi_match_device(dev->driver->acpi_match_table, dev);
1429         if (!id)
1430                 return NULL;
1431         *chip_idx = id->driver_data;
1432         return dev_name(dev);
1433 }
1434
1435 static int ltr501_probe(struct i2c_client *client)
1436 {
1437         const struct i2c_device_id *id = i2c_client_get_device_id(client);
1438         static const char * const regulator_names[] = { "vdd", "vddio" };
1439         struct ltr501_data *data;
1440         struct iio_dev *indio_dev;
1441         struct regmap *regmap;
1442         int ret, partid, chip_idx = 0;
1443         const char *name = NULL;
1444
1445         indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data));
1446         if (!indio_dev)
1447                 return -ENOMEM;
1448
1449         regmap = devm_regmap_init_i2c(client, &ltr501_regmap_config);
1450         if (IS_ERR(regmap)) {
1451                 dev_err(&client->dev, "Regmap initialization failed.\n");
1452                 return PTR_ERR(regmap);
1453         }
1454
1455         data = iio_priv(indio_dev);
1456         i2c_set_clientdata(client, indio_dev);
1457         data->client = client;
1458         data->regmap = regmap;
1459         mutex_init(&data->lock_als);
1460         mutex_init(&data->lock_ps);
1461
1462         ret = devm_regulator_bulk_get_enable(&client->dev,
1463                                              ARRAY_SIZE(regulator_names),
1464                                              regulator_names);
1465         if (ret)
1466                 return dev_err_probe(&client->dev, ret,
1467                                      "Failed to get regulators\n");
1468
1469         data->reg_it = devm_regmap_field_alloc(&client->dev, regmap,
1470                                                reg_field_it);
1471         if (IS_ERR(data->reg_it)) {
1472                 dev_err(&client->dev, "Integ time reg field init failed.\n");
1473                 return PTR_ERR(data->reg_it);
1474         }
1475
1476         data->reg_als_intr = devm_regmap_field_alloc(&client->dev, regmap,
1477                                                      reg_field_als_intr);
1478         if (IS_ERR(data->reg_als_intr)) {
1479                 dev_err(&client->dev, "ALS intr mode reg field init failed\n");
1480                 return PTR_ERR(data->reg_als_intr);
1481         }
1482
1483         data->reg_ps_intr = devm_regmap_field_alloc(&client->dev, regmap,
1484                                                     reg_field_ps_intr);
1485         if (IS_ERR(data->reg_ps_intr)) {
1486                 dev_err(&client->dev, "PS intr mode reg field init failed.\n");
1487                 return PTR_ERR(data->reg_ps_intr);
1488         }
1489
1490         data->reg_als_rate = devm_regmap_field_alloc(&client->dev, regmap,
1491                                                      reg_field_als_rate);
1492         if (IS_ERR(data->reg_als_rate)) {
1493                 dev_err(&client->dev, "ALS samp rate field init failed.\n");
1494                 return PTR_ERR(data->reg_als_rate);
1495         }
1496
1497         data->reg_ps_rate = devm_regmap_field_alloc(&client->dev, regmap,
1498                                                     reg_field_ps_rate);
1499         if (IS_ERR(data->reg_ps_rate)) {
1500                 dev_err(&client->dev, "PS samp rate field init failed.\n");
1501                 return PTR_ERR(data->reg_ps_rate);
1502         }
1503
1504         data->reg_als_prst = devm_regmap_field_alloc(&client->dev, regmap,
1505                                                      reg_field_als_prst);
1506         if (IS_ERR(data->reg_als_prst)) {
1507                 dev_err(&client->dev, "ALS prst reg field init failed\n");
1508                 return PTR_ERR(data->reg_als_prst);
1509         }
1510
1511         data->reg_ps_prst = devm_regmap_field_alloc(&client->dev, regmap,
1512                                                     reg_field_ps_prst);
1513         if (IS_ERR(data->reg_ps_prst)) {
1514                 dev_err(&client->dev, "PS prst reg field init failed.\n");
1515                 return PTR_ERR(data->reg_ps_prst);
1516         }
1517
1518         ret = regmap_read(data->regmap, LTR501_PART_ID, &partid);
1519         if (ret < 0)
1520                 return ret;
1521
1522         if (id) {
1523                 name = id->name;
1524                 chip_idx = id->driver_data;
1525         } else  if (ACPI_HANDLE(&client->dev)) {
1526                 name = ltr501_match_acpi_device(&client->dev, &chip_idx);
1527         } else {
1528                 return -ENODEV;
1529         }
1530
1531         data->chip_info = &ltr501_chip_info_tbl[chip_idx];
1532
1533         if ((partid >> 4) != data->chip_info->partid)
1534                 return -ENODEV;
1535
1536         if (device_property_read_u32(&client->dev, "proximity-near-level",
1537                                      &data->near_level))
1538                 data->near_level = 0;
1539
1540         indio_dev->info = data->chip_info->info;
1541         indio_dev->channels = data->chip_info->channels;
1542         indio_dev->num_channels = data->chip_info->no_channels;
1543         indio_dev->name = name;
1544         indio_dev->modes = INDIO_DIRECT_MODE;
1545
1546         ret = ltr501_init(data);
1547         if (ret < 0)
1548                 return ret;
1549
1550         if (client->irq > 0) {
1551                 ret = devm_request_threaded_irq(&client->dev, client->irq,
1552                                                 NULL, ltr501_interrupt_handler,
1553                                                 IRQF_TRIGGER_FALLING |
1554                                                 IRQF_ONESHOT,
1555                                                 "ltr501_thresh_event",
1556                                                 indio_dev);
1557                 if (ret) {
1558                         dev_err(&client->dev, "request irq (%d) failed\n",
1559                                 client->irq);
1560                         return ret;
1561                 }
1562         } else {
1563                 indio_dev->info = data->chip_info->info_no_irq;
1564         }
1565
1566         ret = iio_triggered_buffer_setup(indio_dev, NULL,
1567                                          ltr501_trigger_handler, NULL);
1568         if (ret)
1569                 goto powerdown_on_error;
1570
1571         ret = iio_device_register(indio_dev);
1572         if (ret)
1573                 goto error_unreg_buffer;
1574
1575         return 0;
1576
1577 error_unreg_buffer:
1578         iio_triggered_buffer_cleanup(indio_dev);
1579 powerdown_on_error:
1580         ltr501_powerdown(data);
1581         return ret;
1582 }
1583
1584 static void ltr501_remove(struct i2c_client *client)
1585 {
1586         struct iio_dev *indio_dev = i2c_get_clientdata(client);
1587
1588         iio_device_unregister(indio_dev);
1589         iio_triggered_buffer_cleanup(indio_dev);
1590         ltr501_powerdown(iio_priv(indio_dev));
1591 }
1592
1593 static int ltr501_suspend(struct device *dev)
1594 {
1595         struct ltr501_data *data = iio_priv(i2c_get_clientdata(
1596                                             to_i2c_client(dev)));
1597         return ltr501_powerdown(data);
1598 }
1599
1600 static int ltr501_resume(struct device *dev)
1601 {
1602         struct ltr501_data *data = iio_priv(i2c_get_clientdata(
1603                                             to_i2c_client(dev)));
1604
1605         return ltr501_write_contr(data, data->als_contr,
1606                 data->ps_contr);
1607 }
1608
1609 static DEFINE_SIMPLE_DEV_PM_OPS(ltr501_pm_ops, ltr501_suspend, ltr501_resume);
1610
1611 static const struct acpi_device_id ltr_acpi_match[] = {
1612         { "LTER0501", ltr501 },
1613         { "LTER0559", ltr559 },
1614         { "LTER0301", ltr301 },
1615         { },
1616 };
1617 MODULE_DEVICE_TABLE(acpi, ltr_acpi_match);
1618
1619 static const struct i2c_device_id ltr501_id[] = {
1620         { "ltr501", ltr501 },
1621         { "ltr559", ltr559 },
1622         { "ltr301", ltr301 },
1623         { "ltr303", ltr303 },
1624         { }
1625 };
1626 MODULE_DEVICE_TABLE(i2c, ltr501_id);
1627
1628 static const struct of_device_id ltr501_of_match[] = {
1629         { .compatible = "liteon,ltr501", },
1630         { .compatible = "liteon,ltr559", },
1631         { .compatible = "liteon,ltr301", },
1632         { .compatible = "liteon,ltr303", },
1633         {}
1634 };
1635 MODULE_DEVICE_TABLE(of, ltr501_of_match);
1636
1637 static struct i2c_driver ltr501_driver = {
1638         .driver = {
1639                 .name   = LTR501_DRV_NAME,
1640                 .of_match_table = ltr501_of_match,
1641                 .pm     = pm_sleep_ptr(&ltr501_pm_ops),
1642                 .acpi_match_table = ACPI_PTR(ltr_acpi_match),
1643         },
1644         .probe = ltr501_probe,
1645         .remove = ltr501_remove,
1646         .id_table = ltr501_id,
1647 };
1648
1649 module_i2c_driver(ltr501_driver);
1650
1651 MODULE_AUTHOR("Peter Meerwald <pmeerw@pmeerw.net>");
1652 MODULE_DESCRIPTION("Lite-On LTR501 ambient light and proximity sensor driver");
1653 MODULE_LICENSE("GPL");