drivers/iio/light/ltr501.c

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