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 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, 0, 0);
  75 static const struct reg_field reg_field_ps_intr =
  76                                 REG_FIELD(LTR501_INTR, 1, 1);
  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 struct ltr501_data {
  92         struct i2c_client *client;
  93         struct mutex lock_als, lock_ps;
  94         u8 als_contr, ps_contr;
  95         int als_period, ps_period; /* period in micro seconds */
  96         struct regmap *regmap;
  97         struct regmap_field *reg_it;
  98         struct regmap_field *reg_als_intr;
  99         struct regmap_field *reg_ps_intr;
 100         struct regmap_field *reg_als_rate;
 101         struct regmap_field *reg_ps_rate;
 102         struct regmap_field *reg_als_prst;
 103         struct regmap_field *reg_ps_prst;
 104 };
 105
 106 static const struct ltr501_samp_table ltr501_als_samp_table[] = {
 107                         {20000000, 50000}, {10000000, 100000},
 108                         {5000000, 200000}, {2000000, 500000},
 109                         {1000000, 1000000}, {500000, 2000000},
 110                         {500000, 2000000}, {500000, 2000000}
 111 };
 112
 113 static const struct ltr501_samp_table ltr501_ps_samp_table[] = {
 114                         {20000000, 50000}, {14285714, 70000},
 115                         {10000000, 100000}, {5000000, 200000},
 116                         {2000000, 500000}, {1000000, 1000000},
 117                         {500000, 2000000}, {500000, 2000000},
 118                         {500000, 2000000}
 119 };
 120
 121 static unsigned int ltr501_match_samp_freq(const struct ltr501_samp_table *tab,
 122                                            int len, int val, int val2)
 123 {
 124         int i, freq;
 125
 126         freq = val * 1000000 + val2;
 127
 128         for (i = 0; i < len; i++) {
 129                 if (tab[i].freq_val == freq)
 130                         return i;
 131         }
 132
 133         return -EINVAL;
 134 }
 135
 136 static int ltr501_als_read_samp_freq(struct ltr501_data *data,
 137                                      int *val, int *val2)
 138 {
 139         int ret, i;
 140
 141         ret = regmap_field_read(data->reg_als_rate, &i);
 142         if (ret < 0)
 143                 return ret;
 144
 145         if (i < 0 || i >= ARRAY_SIZE(ltr501_als_samp_table))
 146                 return -EINVAL;
 147
 148         *val = ltr501_als_samp_table[i].freq_val / 1000000;
 149         *val2 = ltr501_als_samp_table[i].freq_val % 1000000;
 150
 151         return IIO_VAL_INT_PLUS_MICRO;
 152 }
 153
 154 static int ltr501_ps_read_samp_freq(struct ltr501_data *data,
 155                                     int *val, int *val2)
 156 {
 157         int ret, i;
 158
 159         ret = regmap_field_read(data->reg_ps_rate, &i);
 160         if (ret < 0)
 161                 return ret;
 162
 163         if (i < 0 || i >= ARRAY_SIZE(ltr501_ps_samp_table))
 164                 return -EINVAL;
 165
 166         *val = ltr501_ps_samp_table[i].freq_val / 1000000;
 167         *val2 = ltr501_ps_samp_table[i].freq_val % 1000000;
 168
 169         return IIO_VAL_INT_PLUS_MICRO;
 170 }
 171
 172 static int ltr501_als_write_samp_freq(struct ltr501_data *data,
 173                                       int val, int val2)
 174 {
 175         int i, ret;
 176
 177         i = ltr501_match_samp_freq(ltr501_als_samp_table,
 178                                    ARRAY_SIZE(ltr501_als_samp_table),
 179                                    val, val2);
 180
 181         if (i < 0)
 182                 return i;
 183
 184         mutex_lock(&data->lock_als);
 185         ret = regmap_field_write(data->reg_als_rate, i);
 186         mutex_unlock(&data->lock_als);
 187
 188         return ret;
 189 }
 190
 191 static int ltr501_ps_write_samp_freq(struct ltr501_data *data,
 192                                      int val, int val2)
 193 {
 194         int i, ret;
 195
 196         i = ltr501_match_samp_freq(ltr501_ps_samp_table,
 197                                    ARRAY_SIZE(ltr501_ps_samp_table),
 198                                    val, val2);
 199
 200         if (i < 0)
 201                 return i;
 202
 203         mutex_lock(&data->lock_ps);
 204         ret = regmap_field_write(data->reg_ps_rate, i);
 205         mutex_unlock(&data->lock_ps);
 206
 207         return ret;
 208 }
 209
 210 static int ltr501_als_read_samp_period(struct ltr501_data *data, int *val)
 211 {
 212         int ret, i;
 213
 214         ret = regmap_field_read(data->reg_als_rate, &i);
 215         if (ret < 0)
 216                 return ret;
 217
 218         if (i < 0 || i >= ARRAY_SIZE(ltr501_als_samp_table))
 219                 return -EINVAL;
 220
 221         *val = ltr501_als_samp_table[i].time_val;
 222
 223         return IIO_VAL_INT;
 224 }
 225
 226 static int ltr501_ps_read_samp_period(struct ltr501_data *data, int *val)
 227 {
 228         int ret, i;
 229
 230         ret = regmap_field_read(data->reg_ps_rate, &i);
 231         if (ret < 0)
 232                 return ret;
 233
 234         if (i < 0 || i >= ARRAY_SIZE(ltr501_ps_samp_table))
 235                 return -EINVAL;
 236
 237         *val = ltr501_ps_samp_table[i].time_val;
 238
 239         return IIO_VAL_INT;
 240 }
 241
 242 static int ltr501_drdy(struct ltr501_data *data, u8 drdy_mask)
 243 {
 244         int tries = 100;
 245         int ret, status;
 246
 247         while (tries--) {
 248                 ret = regmap_read(data->regmap, LTR501_ALS_PS_STATUS, &status);
 249                 if (ret < 0)
 250                         return ret;
 251                 if ((status & drdy_mask) == drdy_mask)
 252                         return 0;
 253                 msleep(25);
 254         }
 255
 256         dev_err(&data->client->dev, "ltr501_drdy() failed, data not ready\n");
 257         return -EIO;
 258 }
 259
 260 static int ltr501_set_it_time(struct ltr501_data *data, int it)
 261 {
 262         int ret, i, index = -1, status;
 263
 264         for (i = 0; i < ARRAY_SIZE(int_time_mapping); i++) {
 265                 if (int_time_mapping[i] == it) {
 266                         index = i;
 267                         break;
 268                 }
 269         }
 270         /* Make sure integ time index is valid */
 271         if (index < 0)
 272                 return -EINVAL;
 273
 274         ret = regmap_read(data->regmap, LTR501_ALS_CONTR, &status);
 275         if (ret < 0)
 276                 return ret;
 277
 278         if (status & LTR501_CONTR_ALS_GAIN_MASK) {
 279                 /*
 280                  * 200 ms and 400 ms integ time can only be
 281                  * used in dynamic range 1
 282                  */
 283                 if (index > 1)
 284                         return -EINVAL;
 285         } else
 286                 /* 50 ms integ time can only be used in dynamic range 2 */
 287                 if (index == 1)
 288                         return -EINVAL;
 289
 290         return regmap_field_write(data->reg_it, index);
 291 }
 292
 293 /* read int time in micro seconds */
 294 static int ltr501_read_it_time(struct ltr501_data *data, int *val, int *val2)
 295 {
 296         int ret, index;
 297
 298         ret = regmap_field_read(data->reg_it, &index);
 299         if (ret < 0)
 300                 return ret;
 301
 302         /* Make sure integ time index is valid */
 303         if (index < 0 || index >= ARRAY_SIZE(int_time_mapping))
 304                 return -EINVAL;
 305
 306         *val2 = int_time_mapping[index];
 307         *val = 0;
 308
 309         return IIO_VAL_INT_PLUS_MICRO;
 310 }
 311
 312 static int ltr501_read_als(struct ltr501_data *data, __le16 buf[2])
 313 {
 314         int ret;
 315
 316         ret = ltr501_drdy(data, LTR501_STATUS_ALS_RDY);
 317         if (ret < 0)
 318                 return ret;
 319         /* always read both ALS channels in given order */
 320         return regmap_bulk_read(data->regmap, LTR501_ALS_DATA1,
 321                                 buf, 2 * sizeof(__le16));
 322 }
 323
 324 static int ltr501_read_ps(struct ltr501_data *data)
 325 {
 326         int ret, status;
 327
 328         ret = ltr501_drdy(data, LTR501_STATUS_PS_RDY);
 329         if (ret < 0)
 330                 return ret;
 331
 332         ret = regmap_bulk_read(data->regmap, LTR501_PS_DATA,
 333                                &status, 2);
 334         if (ret < 0)
 335                 return ret;
 336
 337         return status;
 338 }
 339
 340 static int ltr501_read_intr_prst(struct ltr501_data *data,
 341                                  enum iio_chan_type type,
 342                                  int *val2)
 343 {
 344         int ret, samp_period, prst;
 345
 346         switch (type) {
 347         case IIO_INTENSITY:
 348                 ret = regmap_field_read(data->reg_als_prst, &prst);
 349                 if (ret < 0)
 350                         return ret;
 351
 352                 ret = ltr501_als_read_samp_period(data, &samp_period);
 353
 354                 if (ret < 0)
 355                         return ret;
 356                 *val2 = samp_period * prst;
 357                 return IIO_VAL_INT_PLUS_MICRO;
 358         case IIO_PROXIMITY:
 359                 ret = regmap_field_read(data->reg_ps_prst, &prst);
 360                 if (ret < 0)
 361                         return ret;
 362
 363                 ret = ltr501_ps_read_samp_period(data, &samp_period);
 364
 365                 if (ret < 0)
 366                         return ret;
 367
 368                 *val2 = samp_period * prst;
 369                 return IIO_VAL_INT_PLUS_MICRO;
 370         default:
 371                 return -EINVAL;
 372         }
 373
 374         return -EINVAL;
 375 }
 376
 377 static int ltr501_write_intr_prst(struct ltr501_data *data,
 378                                   enum iio_chan_type type,
 379                                   int val, int val2)
 380 {
 381         int ret, samp_period, new_val;
 382         unsigned long period;
 383
 384         if (val < 0 || val2 < 0)
 385                 return -EINVAL;
 386
 387         /* period in microseconds */
 388         period = ((val * 1000000) + val2);
 389
 390         switch (type) {
 391         case IIO_INTENSITY:
 392                 ret = ltr501_als_read_samp_period(data, &samp_period);
 393                 if (ret < 0)
 394                         return ret;
 395
 396                 /* period should be atleast equal to sampling period */
 397                 if (period < samp_period)
 398                         return -EINVAL;
 399
 400                 new_val = DIV_ROUND_UP(period, samp_period);
 401                 if (new_val < 0 || new_val > 0x0f)
 402                         return -EINVAL;
 403
 404                 mutex_lock(&data->lock_als);
 405                 ret = regmap_field_write(data->reg_als_prst, new_val);
 406                 mutex_unlock(&data->lock_als);
 407                 if (ret >= 0)
 408                         data->als_period = period;
 409
 410                 return ret;
 411         case IIO_PROXIMITY:
 412                 ret = ltr501_ps_read_samp_period(data, &samp_period);
 413                 if (ret < 0)
 414                         return ret;
 415
 416                 /* period should be atleast equal to rate */
 417                 if (period < samp_period)
 418                         return -EINVAL;
 419
 420                 new_val = DIV_ROUND_UP(period, samp_period);
 421                 if (new_val < 0 || new_val > 0x0f)
 422                         return -EINVAL;
 423
 424                 mutex_lock(&data->lock_ps);
 425                 ret = regmap_field_write(data->reg_ps_prst, new_val);
 426                 mutex_unlock(&data->lock_ps);
 427                 if (ret >= 0)
 428                         data->ps_period = period;
 429
 430                 return ret;
 431         default:
 432                 return -EINVAL;
 433         }
 434
 435         return -EINVAL;
 436 }
 437
 438 static const struct iio_event_spec ltr501_als_event_spec[] = {
 439         {
 440                 .type = IIO_EV_TYPE_THRESH,
 441                 .dir = IIO_EV_DIR_RISING,
 442                 .mask_separate = BIT(IIO_EV_INFO_VALUE),
 443         }, {
 444                 .type = IIO_EV_TYPE_THRESH,
 445                 .dir = IIO_EV_DIR_FALLING,
 446                 .mask_separate = BIT(IIO_EV_INFO_VALUE),
 447         }, {
 448                 .type = IIO_EV_TYPE_THRESH,
 449                 .dir = IIO_EV_DIR_EITHER,
 450                 .mask_separate = BIT(IIO_EV_INFO_ENABLE) |
 451                                  BIT(IIO_EV_INFO_PERIOD),
 452         },
 453
 454 };
 455
 456 static const struct iio_event_spec ltr501_pxs_event_spec[] = {
 457         {
 458                 .type = IIO_EV_TYPE_THRESH,
 459                 .dir = IIO_EV_DIR_RISING,
 460                 .mask_separate = BIT(IIO_EV_INFO_VALUE),
 461         }, {
 462                 .type = IIO_EV_TYPE_THRESH,
 463                 .dir = IIO_EV_DIR_FALLING,
 464                 .mask_separate = BIT(IIO_EV_INFO_VALUE),
 465         }, {
 466                 .type = IIO_EV_TYPE_THRESH,
 467                 .dir = IIO_EV_DIR_EITHER,
 468                 .mask_separate = BIT(IIO_EV_INFO_ENABLE) |
 469                                  BIT(IIO_EV_INFO_PERIOD),
 470         },
 471 };
 472
 473 #define LTR501_INTENSITY_CHANNEL(_idx, _addr, _mod, _shared, \
 474                                  _evspec, _evsize) { \
 475         .type = IIO_INTENSITY, \
 476         .modified = 1, \
 477         .address = (_addr), \
 478         .channel2 = (_mod), \
 479         .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \
 480         .info_mask_shared_by_type = (_shared), \
 481         .scan_index = (_idx), \
 482         .scan_type = { \
 483                 .sign = 'u', \
 484                 .realbits = 16, \
 485                 .storagebits = 16, \
 486                 .endianness = IIO_CPU, \
 487         }, \
 488         .event_spec = _evspec,\
 489         .num_event_specs = _evsize,\
 490 }
 491
 492 static const struct iio_chan_spec ltr501_channels[] = {
 493         LTR501_INTENSITY_CHANNEL(0, LTR501_ALS_DATA0, IIO_MOD_LIGHT_BOTH, 0,
 494                                  ltr501_als_event_spec,
 495                                  ARRAY_SIZE(ltr501_als_event_spec)),
 496         LTR501_INTENSITY_CHANNEL(1, LTR501_ALS_DATA1, IIO_MOD_LIGHT_IR,
 497                                  BIT(IIO_CHAN_INFO_SCALE) |
 498                                  BIT(IIO_CHAN_INFO_INT_TIME) |
 499                                  BIT(IIO_CHAN_INFO_SAMP_FREQ),
 500                                  NULL, 0),
 501         {
 502                 .type = IIO_PROXIMITY,
 503                 .address = LTR501_PS_DATA,
 504                 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
 505                         BIT(IIO_CHAN_INFO_SCALE),
 506                 .scan_index = 2,
 507                 .scan_type = {
 508                         .sign = 'u',
 509                         .realbits = 11,
 510                         .storagebits = 16,
 511                         .endianness = IIO_CPU,
 512                 },
 513                 .event_spec = ltr501_pxs_event_spec,
 514                 .num_event_specs = ARRAY_SIZE(ltr501_pxs_event_spec),
 515         },
 516         IIO_CHAN_SOFT_TIMESTAMP(3),
 517 };
 518
 519 static const int ltr501_ps_gain[4][2] = {
 520         {1, 0}, {0, 250000}, {0, 125000}, {0, 62500}
 521 };
 522
 523 static int ltr501_read_raw(struct iio_dev *indio_dev,
 524                            struct iio_chan_spec const *chan,
 525                            int *val, int *val2, long mask)
 526 {
 527         struct ltr501_data *data = iio_priv(indio_dev);
 528         __le16 buf[2];
 529         int ret, i;
 530
 531         switch (mask) {
 532         case IIO_CHAN_INFO_RAW:
 533                 if (iio_buffer_enabled(indio_dev))
 534                         return -EBUSY;
 535
 536                 switch (chan->type) {
 537                 case IIO_INTENSITY:
 538                         mutex_lock(&data->lock_als);
 539                         ret = ltr501_read_als(data, buf);
 540                         mutex_unlock(&data->lock_als);
 541                         if (ret < 0)
 542                                 return ret;
 543                         *val = le16_to_cpu(chan->address == LTR501_ALS_DATA1 ?
 544                                            buf[0] : buf[1]);
 545                         return IIO_VAL_INT;
 546                 case IIO_PROXIMITY:
 547                         mutex_lock(&data->lock_ps);
 548                         ret = ltr501_read_ps(data);
 549                         mutex_unlock(&data->lock_ps);
 550                         if (ret < 0)
 551                                 return ret;
 552                         *val = ret & LTR501_PS_DATA_MASK;
 553                         return IIO_VAL_INT;
 554                 default:
 555                         return -EINVAL;
 556                 }
 557         case IIO_CHAN_INFO_SCALE:
 558                 switch (chan->type) {
 559                 case IIO_INTENSITY:
 560                         if (data->als_contr & LTR501_CONTR_ALS_GAIN_MASK) {
 561                                 *val = 0;
 562                                 *val2 = 5000;
 563                                 return IIO_VAL_INT_PLUS_MICRO;
 564                         }
 565                         *val = 1;
 566                         *val2 = 0;
 567                         return IIO_VAL_INT;
 568                 case IIO_PROXIMITY:
 569                         i = (data->ps_contr & LTR501_CONTR_PS_GAIN_MASK) >>
 570                                 LTR501_CONTR_PS_GAIN_SHIFT;
 571                         *val = ltr501_ps_gain[i][0];
 572                         *val2 = ltr501_ps_gain[i][1];
 573                         return IIO_VAL_INT_PLUS_MICRO;
 574                 default:
 575                         return -EINVAL;
 576                 }
 577         case IIO_CHAN_INFO_INT_TIME:
 578                 switch (chan->type) {
 579                 case IIO_INTENSITY:
 580                         return ltr501_read_it_time(data, val, val2);
 581                 default:
 582                         return -EINVAL;
 583                 }
 584         case IIO_CHAN_INFO_SAMP_FREQ:
 585                 switch (chan->type) {
 586                 case IIO_INTENSITY:
 587                         return ltr501_als_read_samp_freq(data, val, val2);
 588                 case IIO_PROXIMITY:
 589                         return ltr501_ps_read_samp_freq(data, val, val2);
 590                 default:
 591                         return -EINVAL;
 592                 }
 593         }
 594         return -EINVAL;
 595 }
 596
 597 static int ltr501_get_ps_gain_index(int val, int val2)
 598 {
 599         int i;
 600
 601         for (i = 0; i < ARRAY_SIZE(ltr501_ps_gain); i++)
 602                 if (val == ltr501_ps_gain[i][0] && val2 == ltr501_ps_gain[i][1])
 603                         return i;
 604
 605         return -1;
 606 }
 607
 608 static int ltr501_write_raw(struct iio_dev *indio_dev,
 609                             struct iio_chan_spec const *chan,
 610                             int val, int val2, long mask)
 611 {
 612         struct ltr501_data *data = iio_priv(indio_dev);
 613         int i, ret, freq_val, freq_val2;
 614
 615         if (iio_buffer_enabled(indio_dev))
 616                 return -EBUSY;
 617
 618         switch (mask) {
 619         case IIO_CHAN_INFO_SCALE:
 620                 switch (chan->type) {
 621                 case IIO_INTENSITY:
 622                         if (val == 0 && val2 == 5000)
 623                                 data->als_contr |= LTR501_CONTR_ALS_GAIN_MASK;
 624                         else if (val == 1 && val2 == 0)
 625                                 data->als_contr &= ~LTR501_CONTR_ALS_GAIN_MASK;
 626                         else
 627                                 return -EINVAL;
 628
 629                         return regmap_write(data->regmap, LTR501_ALS_CONTR,
 630                                             data->als_contr);
 631                 case IIO_PROXIMITY:
 632                         i = ltr501_get_ps_gain_index(val, val2);
 633                         if (i < 0)
 634                                 return -EINVAL;
 635                         data->ps_contr &= ~LTR501_CONTR_PS_GAIN_MASK;
 636                         data->ps_contr |= i << LTR501_CONTR_PS_GAIN_SHIFT;
 637
 638                         return regmap_write(data->regmap, LTR501_PS_CONTR,
 639                                             data->ps_contr);
 640                 default:
 641                         return -EINVAL;
 642                 }
 643         case IIO_CHAN_INFO_INT_TIME:
 644                 switch (chan->type) {
 645                 case IIO_INTENSITY:
 646                         if (val != 0)
 647                                 return -EINVAL;
 648                         mutex_lock(&data->lock_als);
 649                         i = ltr501_set_it_time(data, val2);
 650                         mutex_unlock(&data->lock_als);
 651                         return i;
 652                 default:
 653                         return -EINVAL;
 654                 }
 655         case IIO_CHAN_INFO_SAMP_FREQ:
 656                 switch (chan->type) {
 657                 case IIO_INTENSITY:
 658                         ret = ltr501_als_read_samp_freq(data, &freq_val,
 659                                                         &freq_val2);
 660                         if (ret < 0)
 661                                 return ret;
 662
 663                         ret = ltr501_als_write_samp_freq(data, val, val2);
 664                         if (ret < 0)
 665                                 return ret;
 666
 667                         /* update persistence count when changing frequency */
 668                         ret = ltr501_write_intr_prst(data, chan->type,
 669                                                      0, data->als_period);
 670
 671                         if (ret < 0)
 672                                 return ltr501_als_write_samp_freq(data,
 673                                                                   freq_val,
 674                                                                   freq_val2);
 675                         return ret;
 676                 case IIO_PROXIMITY:
 677                         ret = ltr501_ps_read_samp_freq(data, &freq_val,
 678                                                        &freq_val2);
 679                         if (ret < 0)
 680                                 return ret;
 681
 682                         ret = ltr501_ps_write_samp_freq(data, val, val2);
 683                         if (ret < 0)
 684                                 return ret;
 685
 686                         /* update persistence count when changing frequency */
 687                         ret = ltr501_write_intr_prst(data, chan->type,
 688                                                      0, data->ps_period);
 689
 690                         if (ret < 0)
 691                                 return ltr501_ps_write_samp_freq(data,
 692                                                                  freq_val,
 693                                                                  freq_val2);
 694                         return ret;
 695                 default:
 696                         return -EINVAL;
 697                 }
 698         }
 699         return -EINVAL;
 700 }
 701
 702 static int ltr501_read_thresh(struct iio_dev *indio_dev,
 703                               const struct iio_chan_spec *chan,
 704                               enum iio_event_type type,
 705                               enum iio_event_direction dir,
 706                               enum iio_event_info info,
 707                               int *val, int *val2)
 708 {
 709         struct ltr501_data *data = iio_priv(indio_dev);
 710         int ret, thresh_data;
 711
 712         switch (chan->type) {
 713         case IIO_INTENSITY:
 714                 switch (dir) {
 715                 case IIO_EV_DIR_RISING:
 716                         ret = regmap_bulk_read(data->regmap,
 717                                                LTR501_ALS_THRESH_UP,
 718                                                &thresh_data, 2);
 719                         if (ret < 0)
 720                                 return ret;
 721                         *val = thresh_data & LTR501_ALS_THRESH_MASK;
 722                         return IIO_VAL_INT;
 723                 case IIO_EV_DIR_FALLING:
 724                         ret = regmap_bulk_read(data->regmap,
 725                                                LTR501_ALS_THRESH_LOW,
 726                                                &thresh_data, 2);
 727                         if (ret < 0)
 728                                 return ret;
 729                         *val = thresh_data & LTR501_ALS_THRESH_MASK;
 730                         return IIO_VAL_INT;
 731                 default:
 732                         return -EINVAL;
 733                 }
 734         case IIO_PROXIMITY:
 735                 switch (dir) {
 736                 case IIO_EV_DIR_RISING:
 737                         ret = regmap_bulk_read(data->regmap,
 738                                                LTR501_PS_THRESH_UP,
 739                                                &thresh_data, 2);
 740                         if (ret < 0)
 741                                 return ret;
 742                         *val = thresh_data & LTR501_PS_THRESH_MASK;
 743                         return IIO_VAL_INT;
 744                 case IIO_EV_DIR_FALLING:
 745                         ret = regmap_bulk_read(data->regmap,
 746                                                LTR501_PS_THRESH_LOW,
 747                                                &thresh_data, 2);
 748                         if (ret < 0)
 749                                 return ret;
 750                         *val = thresh_data & LTR501_PS_THRESH_MASK;
 751                         return IIO_VAL_INT;
 752                 default:
 753                         return -EINVAL;
 754                 }
 755         default:
 756                 return -EINVAL;
 757         }
 758
 759         return -EINVAL;
 760 }
 761
 762 static int ltr501_write_thresh(struct iio_dev *indio_dev,
 763                                const struct iio_chan_spec *chan,
 764                                enum iio_event_type type,
 765                                enum iio_event_direction dir,
 766                                enum iio_event_info info,
 767                                int val, int val2)
 768 {
 769         struct ltr501_data *data = iio_priv(indio_dev);
 770         int ret;
 771
 772         if (val < 0)
 773                 return -EINVAL;
 774
 775         switch (chan->type) {
 776         case IIO_INTENSITY:
 777                 if (val > LTR501_ALS_THRESH_MASK)
 778                         return -EINVAL;
 779                 switch (dir) {
 780                 case IIO_EV_DIR_RISING:
 781                         mutex_lock(&data->lock_als);
 782                         ret = regmap_bulk_write(data->regmap,
 783                                                 LTR501_ALS_THRESH_UP,
 784                                                 &val, 2);
 785                         mutex_unlock(&data->lock_als);
 786                         return ret;
 787                 case IIO_EV_DIR_FALLING:
 788                         mutex_lock(&data->lock_als);
 789                         ret = regmap_bulk_write(data->regmap,
 790                                                 LTR501_ALS_THRESH_LOW,
 791                                                 &val, 2);
 792                         mutex_unlock(&data->lock_als);
 793                         return ret;
 794                 default:
 795                         return -EINVAL;
 796                 }
 797         case IIO_PROXIMITY:
 798                 switch (dir) {
 799                 if (val > LTR501_PS_THRESH_MASK)
 800                         return -EINVAL;
 801                 case IIO_EV_DIR_RISING:
 802                         mutex_lock(&data->lock_ps);
 803                         ret = regmap_bulk_write(data->regmap,
 804                                                 LTR501_PS_THRESH_UP,
 805                                                 &val, 2);
 806                         mutex_unlock(&data->lock_ps);
 807                         return ret;
 808                 case IIO_EV_DIR_FALLING:
 809                         mutex_lock(&data->lock_ps);
 810                         ret = regmap_bulk_write(data->regmap,
 811                                                 LTR501_PS_THRESH_LOW,
 812                                                 &val, 2);
 813                         mutex_unlock(&data->lock_ps);
 814                         return ret;
 815                 default:
 816                         return -EINVAL;
 817                 }
 818         default:
 819                 return -EINVAL;
 820         }
 821
 822         return -EINVAL;
 823 }
 824
 825 static int ltr501_read_event(struct iio_dev *indio_dev,
 826                              const struct iio_chan_spec *chan,
 827                              enum iio_event_type type,
 828                              enum iio_event_direction dir,
 829                              enum iio_event_info info,
 830                              int *val, int *val2)
 831 {
 832         int ret;
 833
 834         switch (info) {
 835         case IIO_EV_INFO_VALUE:
 836                 return ltr501_read_thresh(indio_dev, chan, type, dir,
 837                                           info, val, val2);
 838         case IIO_EV_INFO_PERIOD:
 839                 ret = ltr501_read_intr_prst(iio_priv(indio_dev),
 840                                             chan->type, val2);
 841                 *val = *val2 / 1000000;
 842                 *val2 = *val2 % 1000000;
 843                 return ret;
 844         default:
 845                 return -EINVAL;
 846         }
 847
 848         return -EINVAL;
 849 }
 850
 851 static int ltr501_write_event(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         switch (info) {
 859         case IIO_EV_INFO_VALUE:
 860                 if (val2 != 0)
 861                         return -EINVAL;
 862                 return ltr501_write_thresh(indio_dev, chan, type, dir,
 863                                            info, val, val2);
 864         case IIO_EV_INFO_PERIOD:
 865                 return ltr501_write_intr_prst(iio_priv(indio_dev), chan->type,
 866                                               val, val2);
 867         default:
 868                 return -EINVAL;
 869         }
 870
 871         return -EINVAL;
 872 }
 873
 874 static int ltr501_read_event_config(struct iio_dev *indio_dev,
 875                                     const struct iio_chan_spec *chan,
 876                                     enum iio_event_type type,
 877                                     enum iio_event_direction dir)
 878 {
 879         struct ltr501_data *data = iio_priv(indio_dev);
 880         int ret, status;
 881
 882         switch (chan->type) {
 883         case IIO_INTENSITY:
 884                 ret = regmap_field_read(data->reg_als_intr, &status);
 885                 if (ret < 0)
 886                         return ret;
 887                 return status;
 888         case IIO_PROXIMITY:
 889                 ret = regmap_field_read(data->reg_ps_intr, &status);
 890                 if (ret < 0)
 891                         return ret;
 892                 return status;
 893         default:
 894                 return -EINVAL;
 895         }
 896
 897         return -EINVAL;
 898 }
 899
 900 static int ltr501_write_event_config(struct iio_dev *indio_dev,
 901                                      const struct iio_chan_spec *chan,
 902                                      enum iio_event_type type,
 903                                      enum iio_event_direction dir, int state)
 904 {
 905         struct ltr501_data *data = iio_priv(indio_dev);
 906         int ret;
 907
 908         /* only 1 and 0 are valid inputs */
 909         if (state != 1  || state != 0)
 910                 return -EINVAL;
 911
 912         switch (chan->type) {
 913         case IIO_INTENSITY:
 914                 mutex_lock(&data->lock_als);
 915                 ret = regmap_field_write(data->reg_als_intr, state);
 916                 mutex_unlock(&data->lock_als);
 917                 return ret;
 918         case IIO_PROXIMITY:
 919                 mutex_lock(&data->lock_ps);
 920                 ret = regmap_field_write(data->reg_ps_intr, state);
 921                 mutex_unlock(&data->lock_ps);
 922                 return ret;
 923         default:
 924                 return -EINVAL;
 925         }
 926
 927         return -EINVAL;
 928 }
 929
 930 static IIO_CONST_ATTR(in_proximity_scale_available, "1 0.25 0.125 0.0625");
 931 static IIO_CONST_ATTR(in_intensity_scale_available, "1 0.005");
 932 static IIO_CONST_ATTR_INT_TIME_AVAIL("0.05 0.1 0.2 0.4");
 933 static IIO_CONST_ATTR_SAMP_FREQ_AVAIL("20 10 5 2 1 0.5");
 934
 935 static struct attribute *ltr501_attributes[] = {
 936         &iio_const_attr_in_proximity_scale_available.dev_attr.attr,
 937         &iio_const_attr_in_intensity_scale_available.dev_attr.attr,
 938         &iio_const_attr_integration_time_available.dev_attr.attr,
 939         &iio_const_attr_sampling_frequency_available.dev_attr.attr,
 940         NULL
 941 };
 942
 943 static const struct attribute_group ltr501_attribute_group = {
 944         .attrs = ltr501_attributes,
 945 };
 946
 947 static const struct iio_info ltr501_info_no_irq = {
 948         .read_raw = ltr501_read_raw,
 949         .write_raw = ltr501_write_raw,
 950         .attrs = &ltr501_attribute_group,
 951         .driver_module = THIS_MODULE,
 952 };
 953
 954 static const struct iio_info ltr501_info = {
 955         .read_raw = ltr501_read_raw,
 956         .write_raw = ltr501_write_raw,
 957         .attrs = &ltr501_attribute_group,
 958         .read_event_value       = &ltr501_read_event,
 959         .write_event_value      = &ltr501_write_event,
 960         .read_event_config      = &ltr501_read_event_config,
 961         .write_event_config     = &ltr501_write_event_config,
 962         .driver_module = THIS_MODULE,
 963 };
 964
 965 static int ltr501_write_contr(struct ltr501_data *data, u8 als_val, u8 ps_val)
 966 {
 967         int ret;
 968
 969         ret = regmap_write(data->regmap, LTR501_ALS_CONTR, als_val);
 970         if (ret < 0)
 971                 return ret;
 972
 973         return regmap_write(data->regmap, LTR501_PS_CONTR, ps_val);
 974 }
 975
 976 static irqreturn_t ltr501_trigger_handler(int irq, void *p)
 977 {
 978         struct iio_poll_func *pf = p;
 979         struct iio_dev *indio_dev = pf->indio_dev;
 980         struct ltr501_data *data = iio_priv(indio_dev);
 981         u16 buf[8];
 982         __le16 als_buf[2];
 983         u8 mask = 0;
 984         int j = 0;
 985         int ret, psdata;
 986
 987         memset(buf, 0, sizeof(buf));
 988
 989         /* figure out which data needs to be ready */
 990         if (test_bit(0, indio_dev->active_scan_mask) ||
 991             test_bit(1, indio_dev->active_scan_mask))
 992                 mask |= LTR501_STATUS_ALS_RDY;
 993         if (test_bit(2, indio_dev->active_scan_mask))
 994                 mask |= LTR501_STATUS_PS_RDY;
 995
 996         ret = ltr501_drdy(data, mask);
 997         if (ret < 0)
 998                 goto done;
 999
1000         if (mask & LTR501_STATUS_ALS_RDY) {
1001                 ret = regmap_bulk_read(data->regmap, LTR501_ALS_DATA1,
1002                                        (u8 *)als_buf, sizeof(als_buf));
1003                 if (ret < 0)
1004                         return ret;
1005                 if (test_bit(0, indio_dev->active_scan_mask))
1006                         buf[j++] = le16_to_cpu(als_buf[1]);
1007                 if (test_bit(1, indio_dev->active_scan_mask))
1008                         buf[j++] = le16_to_cpu(als_buf[0]);
1009         }
1010
1011         if (mask & LTR501_STATUS_PS_RDY) {
1012                 ret = regmap_bulk_read(data->regmap, LTR501_PS_DATA,
1013                                        &psdata, 2);
1014                 if (ret < 0)
1015                         goto done;
1016                 buf[j++] = psdata & LTR501_PS_DATA_MASK;
1017         }
1018
1019         iio_push_to_buffers_with_timestamp(indio_dev, buf, iio_get_time_ns());
1020
1021 done:
1022         iio_trigger_notify_done(indio_dev->trig);
1023
1024         return IRQ_HANDLED;
1025 }
1026
1027 static irqreturn_t ltr501_interrupt_handler(int irq, void *private)
1028 {
1029         struct iio_dev *indio_dev = private;
1030         struct ltr501_data *data = iio_priv(indio_dev);
1031         int ret, status;
1032
1033         ret = regmap_read(data->regmap, LTR501_ALS_PS_STATUS, &status);
1034         if (ret < 0) {
1035                 dev_err(&data->client->dev,
1036                         "irq read int reg failed\n");
1037                 return IRQ_HANDLED;
1038         }
1039
1040         if (status & LTR501_STATUS_ALS_INTR)
1041                 iio_push_event(indio_dev,
1042                                IIO_UNMOD_EVENT_CODE(IIO_INTENSITY, 0,
1043                                                     IIO_EV_TYPE_THRESH,
1044                                                     IIO_EV_DIR_EITHER),
1045                                iio_get_time_ns());
1046
1047         if (status & LTR501_STATUS_PS_INTR)
1048                 iio_push_event(indio_dev,
1049                                IIO_UNMOD_EVENT_CODE(IIO_PROXIMITY, 0,
1050                                                     IIO_EV_TYPE_THRESH,
1051                                                     IIO_EV_DIR_EITHER),
1052                                iio_get_time_ns());
1053
1054         return IRQ_HANDLED;
1055 }
1056
1057 static int ltr501_init(struct ltr501_data *data)
1058 {
1059         int ret, status;
1060
1061         ret = regmap_read(data->regmap, LTR501_ALS_CONTR, &status);
1062         if (ret < 0)
1063                 return ret;
1064
1065         data->als_contr = status | LTR501_CONTR_ACTIVE;
1066
1067         ret = regmap_read(data->regmap, LTR501_PS_CONTR, &status);
1068         if (ret < 0)
1069                 return ret;
1070
1071         data->ps_contr = status | LTR501_CONTR_ACTIVE;
1072
1073         ret = ltr501_read_intr_prst(data, IIO_INTENSITY, &data->als_period);
1074         if (ret < 0)
1075                 return ret;
1076
1077         ret = ltr501_read_intr_prst(data, IIO_PROXIMITY, &data->ps_period);
1078         if (ret < 0)
1079                 return ret;
1080
1081         return ltr501_write_contr(data, data->als_contr, data->ps_contr);
1082 }
1083
1084 static bool ltr501_is_volatile_reg(struct device *dev, unsigned int reg)
1085 {
1086         switch (reg) {
1087         case LTR501_ALS_DATA1:
1088         case LTR501_ALS_DATA0:
1089         case LTR501_ALS_PS_STATUS:
1090         case LTR501_PS_DATA:
1091                 return true;
1092         default:
1093                 return false;
1094         }
1095 }
1096
1097 static struct regmap_config ltr501_regmap_config = {
1098         .name =  LTR501_REGMAP_NAME,
1099         .reg_bits = 8,
1100         .val_bits = 8,
1101         .max_register = LTR501_MAX_REG,
1102         .cache_type = REGCACHE_RBTREE,
1103         .volatile_reg = ltr501_is_volatile_reg,
1104 };
1105
1106 static int ltr501_powerdown(struct ltr501_data *data)
1107 {
1108         return ltr501_write_contr(data, data->als_contr & ~LTR501_CONTR_ACTIVE,
1109                                   data->ps_contr & ~LTR501_CONTR_ACTIVE);
1110 }
1111
1112 static int ltr501_probe(struct i2c_client *client,
1113                         const struct i2c_device_id *id)
1114 {
1115         struct ltr501_data *data;
1116         struct iio_dev *indio_dev;
1117         struct regmap *regmap;
1118         int ret, partid;
1119
1120         indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data));
1121         if (!indio_dev)
1122                 return -ENOMEM;
1123
1124         regmap = devm_regmap_init_i2c(client, &ltr501_regmap_config);
1125         if (IS_ERR(regmap)) {
1126                 dev_err(&client->dev, "Regmap initialization failed.\n");
1127                 return PTR_ERR(regmap);
1128         }
1129
1130         data = iio_priv(indio_dev);
1131         i2c_set_clientdata(client, indio_dev);
1132         data->client = client;
1133         data->regmap = regmap;
1134         mutex_init(&data->lock_als);
1135         mutex_init(&data->lock_ps);
1136
1137         data->reg_it = devm_regmap_field_alloc(&client->dev, regmap,
1138                                                reg_field_it);
1139         if (IS_ERR(data->reg_it)) {
1140                 dev_err(&client->dev, "Integ time reg field init failed.\n");
1141                 return PTR_ERR(data->reg_it);
1142         }
1143
1144         data->reg_als_intr = devm_regmap_field_alloc(&client->dev, regmap,
1145                                                      reg_field_als_intr);
1146         if (IS_ERR(data->reg_als_intr)) {
1147                 dev_err(&client->dev, "ALS intr mode reg field init failed\n");
1148                 return PTR_ERR(data->reg_als_intr);
1149         }
1150
1151         data->reg_ps_intr = devm_regmap_field_alloc(&client->dev, regmap,
1152                                                     reg_field_ps_intr);
1153         if (IS_ERR(data->reg_ps_intr)) {
1154                 dev_err(&client->dev, "PS intr mode reg field init failed.\n");
1155                 return PTR_ERR(data->reg_ps_intr);
1156         }
1157
1158         data->reg_als_rate = devm_regmap_field_alloc(&client->dev, regmap,
1159                                                      reg_field_als_rate);
1160         if (IS_ERR(data->reg_als_rate)) {
1161                 dev_err(&client->dev, "ALS samp rate field init failed.\n");
1162                 return PTR_ERR(data->reg_als_rate);
1163         }
1164
1165         data->reg_ps_rate = devm_regmap_field_alloc(&client->dev, regmap,
1166                                                     reg_field_ps_rate);
1167         if (IS_ERR(data->reg_ps_rate)) {
1168                 dev_err(&client->dev, "PS samp rate field init failed.\n");
1169                 return PTR_ERR(data->reg_ps_rate);
1170         }
1171
1172         data->reg_als_prst = devm_regmap_field_alloc(&client->dev, regmap,
1173                                                      reg_field_als_prst);
1174         if (IS_ERR(data->reg_als_prst)) {
1175                 dev_err(&client->dev, "ALS prst reg field init failed\n");
1176                 return PTR_ERR(data->reg_als_prst);
1177         }
1178
1179         data->reg_ps_prst = devm_regmap_field_alloc(&client->dev, regmap,
1180                                                     reg_field_ps_prst);
1181         if (IS_ERR(data->reg_ps_prst)) {
1182                 dev_err(&client->dev, "PS prst reg field init failed.\n");
1183                 return PTR_ERR(data->reg_ps_prst);
1184         }
1185
1186         ret = regmap_read(data->regmap, LTR501_PART_ID, &partid);
1187         if (ret < 0)
1188                 return ret;
1189         if ((partid >> 4) != 0x8)
1190                 return -ENODEV;
1191
1192         indio_dev->dev.parent = &client->dev;
1193         indio_dev->channels = ltr501_channels;
1194         indio_dev->num_channels = ARRAY_SIZE(ltr501_channels);
1195         indio_dev->name = LTR501_DRV_NAME;
1196         indio_dev->modes = INDIO_DIRECT_MODE;
1197
1198         ret = ltr501_init(data);
1199         if (ret < 0)
1200                 return ret;
1201
1202         if (client->irq > 0) {
1203                 indio_dev->info = &ltr501_info;
1204                 ret = devm_request_threaded_irq(&client->dev, client->irq,
1205                                                 NULL, ltr501_interrupt_handler,
1206                                                 IRQF_TRIGGER_FALLING |
1207                                                 IRQF_ONESHOT,
1208                                                 "ltr501_thresh_event",
1209                                                 indio_dev);
1210                 if (ret) {
1211                         dev_err(&client->dev, "request irq (%d) failed\n",
1212                                 client->irq);
1213                         return ret;
1214                 }
1215         } else {
1216                 indio_dev->info = &ltr501_info_no_irq;
1217         }
1218
1219         ret = iio_triggered_buffer_setup(indio_dev, NULL,
1220                                          ltr501_trigger_handler, NULL);
1221         if (ret)
1222                 goto powerdown_on_error;
1223
1224         ret = iio_device_register(indio_dev);
1225         if (ret)
1226                 goto error_unreg_buffer;
1227
1228         return 0;
1229
1230 error_unreg_buffer:
1231         iio_triggered_buffer_cleanup(indio_dev);
1232 powerdown_on_error:
1233         ltr501_powerdown(data);
1234         return ret;
1235 }
1236
1237 static int ltr501_remove(struct i2c_client *client)
1238 {
1239         struct iio_dev *indio_dev = i2c_get_clientdata(client);
1240
1241         iio_device_unregister(indio_dev);
1242         iio_triggered_buffer_cleanup(indio_dev);
1243         ltr501_powerdown(iio_priv(indio_dev));
1244
1245         return 0;
1246 }
1247
1248 #ifdef CONFIG_PM_SLEEP
1249 static int ltr501_suspend(struct device *dev)
1250 {
1251         struct ltr501_data *data = iio_priv(i2c_get_clientdata(
1252                                             to_i2c_client(dev)));
1253         return ltr501_powerdown(data);
1254 }
1255
1256 static int ltr501_resume(struct device *dev)
1257 {
1258         struct ltr501_data *data = iio_priv(i2c_get_clientdata(
1259                                             to_i2c_client(dev)));
1260
1261         return ltr501_write_contr(data, data->als_contr,
1262                 data->ps_contr);
1263 }
1264 #endif
1265
1266 static SIMPLE_DEV_PM_OPS(ltr501_pm_ops, ltr501_suspend, ltr501_resume);
1267
1268 static const struct acpi_device_id ltr_acpi_match[] = {
1269         {"LTER0501", 0},
1270         { },
1271 };
1272 MODULE_DEVICE_TABLE(acpi, ltr_acpi_match);
1273
1274 static const struct i2c_device_id ltr501_id[] = {
1275         { "ltr501", 0 },
1276         { }
1277 };
1278 MODULE_DEVICE_TABLE(i2c, ltr501_id);
1279
1280 static struct i2c_driver ltr501_driver = {
1281         .driver = {
1282                 .name   = LTR501_DRV_NAME,
1283                 .pm     = &ltr501_pm_ops,
1284                 .acpi_match_table = ACPI_PTR(ltr_acpi_match),
1285                 .owner  = THIS_MODULE,
1286         },
1287         .probe  = ltr501_probe,
1288         .remove = ltr501_remove,
1289         .id_table = ltr501_id,
1290 };
1291
1292 module_i2c_driver(ltr501_driver);
1293
1294 MODULE_AUTHOR("Peter Meerwald <pmeerw@pmeerw.net>");
1295 MODULE_DESCRIPTION("Lite-On LTR501 ambient light and proximity sensor driver");
1296 MODULE_LICENSE("GPL");