drivers/iio/light/ltr501.c

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