drivers/iio/light/tsl2772.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * Device driver for monitoring ambient light intensity in (lux) and proximity
   4  * detection (prox) within the TAOS TSL2571, TSL2671, TMD2671, TSL2771, TMD2771,
   5  * TSL2572, TSL2672, TMD2672, TSL2772, and TMD2772 devices.
   6  *
   7  * Copyright (c) 2012, TAOS Corporation.
   8  * Copyright (c) 2017-2018 Brian Masney <masneyb@onstation.org>
   9  */
  10
  11 #include <linux/delay.h>
  12 #include <linux/errno.h>
  13 #include <linux/i2c.h>
  14 #include <linux/interrupt.h>
  15 #include <linux/kernel.h>
  16 #include <linux/module.h>
  17 #include <linux/mutex.h>
  18 #include <linux/slab.h>
  19 #include <linux/iio/events.h>
  20 #include <linux/iio/iio.h>
  21 #include <linux/iio/sysfs.h>
  22 #include <linux/platform_data/tsl2772.h>
  23
  24 /* Cal defs */
  25 #define PROX_STAT_CAL                   0
  26 #define PROX_STAT_SAMP                  1
  27 #define MAX_SAMPLES_CAL                 200
  28
  29 /* TSL2772 Device ID */
  30 #define TRITON_ID                       0x00
  31 #define SWORDFISH_ID                    0x30
  32 #define HALIBUT_ID                      0x20
  33
  34 /* Lux calculation constants */
  35 #define TSL2772_LUX_CALC_OVER_FLOW      65535
  36
  37 /*
  38  * TAOS Register definitions - Note: depending on device, some of these register
  39  * are not used and the register address is benign.
  40  */
  41
  42 /* Register offsets */
  43 #define TSL2772_MAX_CONFIG_REG          16
  44
  45 /* Device Registers and Masks */
  46 #define TSL2772_CNTRL                   0x00
  47 #define TSL2772_ALS_TIME                0X01
  48 #define TSL2772_PRX_TIME                0x02
  49 #define TSL2772_WAIT_TIME               0x03
  50 #define TSL2772_ALS_MINTHRESHLO         0X04
  51 #define TSL2772_ALS_MINTHRESHHI         0X05
  52 #define TSL2772_ALS_MAXTHRESHLO         0X06
  53 #define TSL2772_ALS_MAXTHRESHHI         0X07
  54 #define TSL2772_PRX_MINTHRESHLO         0X08
  55 #define TSL2772_PRX_MINTHRESHHI         0X09
  56 #define TSL2772_PRX_MAXTHRESHLO         0X0A
  57 #define TSL2772_PRX_MAXTHRESHHI         0X0B
  58 #define TSL2772_PERSISTENCE             0x0C
  59 #define TSL2772_ALS_PRX_CONFIG          0x0D
  60 #define TSL2772_PRX_COUNT               0x0E
  61 #define TSL2772_GAIN                    0x0F
  62 #define TSL2772_NOTUSED                 0x10
  63 #define TSL2772_REVID                   0x11
  64 #define TSL2772_CHIPID                  0x12
  65 #define TSL2772_STATUS                  0x13
  66 #define TSL2772_ALS_CHAN0LO             0x14
  67 #define TSL2772_ALS_CHAN0HI             0x15
  68 #define TSL2772_ALS_CHAN1LO             0x16
  69 #define TSL2772_ALS_CHAN1HI             0x17
  70 #define TSL2772_PRX_LO                  0x18
  71 #define TSL2772_PRX_HI                  0x19
  72
  73 /* tsl2772 cmd reg masks */
  74 #define TSL2772_CMD_REG                 0x80
  75 #define TSL2772_CMD_SPL_FN              0x60
  76 #define TSL2772_CMD_REPEAT_PROTO        0x00
  77 #define TSL2772_CMD_AUTOINC_PROTO       0x20
  78
  79 #define TSL2772_CMD_PROX_INT_CLR        0X05
  80 #define TSL2772_CMD_ALS_INT_CLR         0x06
  81 #define TSL2772_CMD_PROXALS_INT_CLR     0X07
  82
  83 /* tsl2772 cntrl reg masks */
  84 #define TSL2772_CNTL_ADC_ENBL           0x02
  85 #define TSL2772_CNTL_PWR_ON             0x01
  86
  87 /* tsl2772 status reg masks */
  88 #define TSL2772_STA_ADC_VALID           0x01
  89 #define TSL2772_STA_PRX_VALID           0x02
  90 #define TSL2772_STA_ADC_PRX_VALID       (TSL2772_STA_ADC_VALID | \
  91                                          TSL2772_STA_PRX_VALID)
  92 #define TSL2772_STA_ALS_INTR            0x10
  93 #define TSL2772_STA_PRX_INTR            0x20
  94
  95 /* tsl2772 cntrl reg masks */
  96 #define TSL2772_CNTL_REG_CLEAR          0x00
  97 #define TSL2772_CNTL_PROX_INT_ENBL      0X20
  98 #define TSL2772_CNTL_ALS_INT_ENBL       0X10
  99 #define TSL2772_CNTL_WAIT_TMR_ENBL      0X08
 100 #define TSL2772_CNTL_PROX_DET_ENBL      0X04
 101 #define TSL2772_CNTL_PWRON              0x01
 102 #define TSL2772_CNTL_ALSPON_ENBL        0x03
 103 #define TSL2772_CNTL_INTALSPON_ENBL     0x13
 104 #define TSL2772_CNTL_PROXPON_ENBL       0x0F
 105 #define TSL2772_CNTL_INTPROXPON_ENBL    0x2F
 106
 107 #define TSL2772_ALS_GAIN_TRIM_MIN       250
 108 #define TSL2772_ALS_GAIN_TRIM_MAX       4000
 109
 110 /* Device family members */
 111 enum {
 112         tsl2571,
 113         tsl2671,
 114         tmd2671,
 115         tsl2771,
 116         tmd2771,
 117         tsl2572,
 118         tsl2672,
 119         tmd2672,
 120         tsl2772,
 121         tmd2772
 122 };
 123
 124 enum {
 125         TSL2772_CHIP_UNKNOWN = 0,
 126         TSL2772_CHIP_WORKING = 1,
 127         TSL2772_CHIP_SUSPENDED = 2
 128 };
 129
 130 /* Per-device data */
 131 struct tsl2772_als_info {
 132         u16 als_ch0;
 133         u16 als_ch1;
 134         u16 lux;
 135 };
 136
 137 struct tsl2772_chip_info {
 138         int chan_table_elements;
 139         struct iio_chan_spec channel_with_events[4];
 140         struct iio_chan_spec channel_without_events[4];
 141         const struct iio_info *info;
 142 };
 143
 144 struct tsl2772_chip {
 145         kernel_ulong_t id;
 146         struct mutex prox_mutex;
 147         struct mutex als_mutex;
 148         struct i2c_client *client;
 149         u16 prox_data;
 150         struct tsl2772_als_info als_cur_info;
 151         struct tsl2772_settings settings;
 152         struct tsl2772_platform_data *pdata;
 153         int als_gain_time_scale;
 154         int als_saturation;
 155         int tsl2772_chip_status;
 156         u8 tsl2772_config[TSL2772_MAX_CONFIG_REG];
 157         const struct tsl2772_chip_info  *chip_info;
 158         const struct iio_info *info;
 159         s64 event_timestamp;
 160         /*
 161          * This structure is intentionally large to accommodate
 162          * updates via sysfs.
 163          * Sized to 9 = max 8 segments + 1 termination segment
 164          */
 165         struct tsl2772_lux tsl2772_device_lux[TSL2772_MAX_LUX_TABLE_SIZE];
 166 };
 167
 168 /*
 169  * Different devices require different coefficents, and these numbers were
 170  * derived from the 'Lux Equation' section of the various device datasheets.
 171  * All of these coefficients assume a Glass Attenuation (GA) factor of 1.
 172  * The coefficients are multiplied by 1000 to avoid floating point operations.
 173  * The two rows in each table correspond to the Lux1 and Lux2 equations from
 174  * the datasheets.
 175  */
 176 static const struct tsl2772_lux tsl2x71_lux_table[TSL2772_DEF_LUX_TABLE_SZ] = {
 177         { 53000, 106000 },
 178         { 31800,  53000 },
 179         { 0,          0 },
 180 };
 181
 182 static const struct tsl2772_lux tmd2x71_lux_table[TSL2772_DEF_LUX_TABLE_SZ] = {
 183         { 24000,  48000 },
 184         { 14400,  24000 },
 185         { 0,          0 },
 186 };
 187
 188 static const struct tsl2772_lux tsl2x72_lux_table[TSL2772_DEF_LUX_TABLE_SZ] = {
 189         { 60000, 112200 },
 190         { 37800,  60000 },
 191         {     0,      0 },
 192 };
 193
 194 static const struct tsl2772_lux tmd2x72_lux_table[TSL2772_DEF_LUX_TABLE_SZ] = {
 195         { 20000,  35000 },
 196         { 12600,  20000 },
 197         {     0,      0 },
 198 };
 199
 200 static const struct tsl2772_lux *tsl2772_default_lux_table_group[] = {
 201         [tsl2571] = tsl2x71_lux_table,
 202         [tsl2671] = tsl2x71_lux_table,
 203         [tmd2671] = tmd2x71_lux_table,
 204         [tsl2771] = tsl2x71_lux_table,
 205         [tmd2771] = tmd2x71_lux_table,
 206         [tsl2572] = tsl2x72_lux_table,
 207         [tsl2672] = tsl2x72_lux_table,
 208         [tmd2672] = tmd2x72_lux_table,
 209         [tsl2772] = tsl2x72_lux_table,
 210         [tmd2772] = tmd2x72_lux_table,
 211 };
 212
 213 static const struct tsl2772_settings tsl2772_default_settings = {
 214         .als_time = 255, /* 2.72 / 2.73 ms */
 215         .als_gain = 0,
 216         .prox_time = 255, /* 2.72 / 2.73 ms */
 217         .prox_gain = 0,
 218         .wait_time = 255,
 219         .als_prox_config = 0,
 220         .als_gain_trim = 1000,
 221         .als_cal_target = 150,
 222         .als_persistence = 1,
 223         .als_interrupt_en = false,
 224         .als_thresh_low = 200,
 225         .als_thresh_high = 256,
 226         .prox_persistence = 1,
 227         .prox_interrupt_en = false,
 228         .prox_thres_low  = 0,
 229         .prox_thres_high = 512,
 230         .prox_max_samples_cal = 30,
 231         .prox_pulse_count = 8,
 232         .prox_diode = TSL2772_DIODE1,
 233         .prox_power = TSL2772_100_mA
 234 };
 235
 236 static const s16 tsl2772_als_gain[] = {
 237         1,
 238         8,
 239         16,
 240         120
 241 };
 242
 243 static const s16 tsl2772_prox_gain[] = {
 244         1,
 245         2,
 246         4,
 247         8
 248 };
 249
 250 static const int tsl2772_int_time_avail[][6] = {
 251         [tsl2571] = { 0, 2720, 0, 2720, 0, 696000 },
 252         [tsl2671] = { 0, 2720, 0, 2720, 0, 696000 },
 253         [tmd2671] = { 0, 2720, 0, 2720, 0, 696000 },
 254         [tsl2771] = { 0, 2720, 0, 2720, 0, 696000 },
 255         [tmd2771] = { 0, 2720, 0, 2720, 0, 696000 },
 256         [tsl2572] = { 0, 2730, 0, 2730, 0, 699000 },
 257         [tsl2672] = { 0, 2730, 0, 2730, 0, 699000 },
 258         [tmd2672] = { 0, 2730, 0, 2730, 0, 699000 },
 259         [tsl2772] = { 0, 2730, 0, 2730, 0, 699000 },
 260         [tmd2772] = { 0, 2730, 0, 2730, 0, 699000 },
 261 };
 262
 263 static int tsl2772_int_calibscale_avail[] = { 1, 8, 16, 120 };
 264
 265 static int tsl2772_prox_calibscale_avail[] = { 1, 2, 4, 8 };
 266
 267 /* Channel variations */
 268 enum {
 269         ALS,
 270         PRX,
 271         ALSPRX,
 272         PRX2,
 273         ALSPRX2,
 274 };
 275
 276 static const u8 device_channel_config[] = {
 277         [tsl2571] = ALS,
 278         [tsl2671] = PRX,
 279         [tmd2671] = PRX,
 280         [tsl2771] = ALSPRX,
 281         [tmd2771] = ALSPRX,
 282         [tsl2572] = ALS,
 283         [tsl2672] = PRX2,
 284         [tmd2672] = PRX2,
 285         [tsl2772] = ALSPRX2,
 286         [tmd2772] = ALSPRX2
 287 };
 288
 289 static int tsl2772_read_status(struct tsl2772_chip *chip)
 290 {
 291         int ret;
 292
 293         ret = i2c_smbus_read_byte_data(chip->client,
 294                                        TSL2772_CMD_REG | TSL2772_STATUS);
 295         if (ret < 0)
 296                 dev_err(&chip->client->dev,
 297                         "%s: failed to read STATUS register: %d\n", __func__,
 298                         ret);
 299
 300         return ret;
 301 }
 302
 303 static int tsl2772_write_control_reg(struct tsl2772_chip *chip, u8 data)
 304 {
 305         int ret;
 306
 307         ret = i2c_smbus_write_byte_data(chip->client,
 308                                         TSL2772_CMD_REG | TSL2772_CNTRL, data);
 309         if (ret < 0) {
 310                 dev_err(&chip->client->dev,
 311                         "%s: failed to write to control register %x: %d\n",
 312                         __func__, data, ret);
 313         }
 314
 315         return ret;
 316 }
 317
 318 static int tsl2772_read_autoinc_regs(struct tsl2772_chip *chip, int lower_reg,
 319                                      int upper_reg)
 320 {
 321         u8 buf[2];
 322         int ret;
 323
 324         ret = i2c_smbus_write_byte(chip->client,
 325                                    TSL2772_CMD_REG | TSL2772_CMD_AUTOINC_PROTO |
 326                                    lower_reg);
 327         if (ret < 0) {
 328                 dev_err(&chip->client->dev,
 329                         "%s: failed to enable auto increment protocol: %d\n",
 330                         __func__, ret);
 331                 return ret;
 332         }
 333
 334         ret = i2c_smbus_read_byte_data(chip->client,
 335                                        TSL2772_CMD_REG | lower_reg);
 336         if (ret < 0) {
 337                 dev_err(&chip->client->dev,
 338                         "%s: failed to read from register %x: %d\n", __func__,
 339                         lower_reg, ret);
 340                 return ret;
 341         }
 342         buf[0] = ret;
 343
 344         ret = i2c_smbus_read_byte_data(chip->client,
 345                                        TSL2772_CMD_REG | upper_reg);
 346         if (ret < 0) {
 347                 dev_err(&chip->client->dev,
 348                         "%s: failed to read from register %x: %d\n", __func__,
 349                         upper_reg, ret);
 350                 return ret;
 351         }
 352         buf[1] = ret;
 353
 354         ret = i2c_smbus_write_byte(chip->client,
 355                                    TSL2772_CMD_REG | TSL2772_CMD_REPEAT_PROTO |
 356                                    lower_reg);
 357         if (ret < 0) {
 358                 dev_err(&chip->client->dev,
 359                         "%s: failed to enable repeated byte protocol: %d\n",
 360                         __func__, ret);
 361                 return ret;
 362         }
 363
 364         return le16_to_cpup((const __le16 *)&buf[0]);
 365 }
 366
 367 /**
 368  * tsl2772_get_lux() - Reads and calculates current lux value.
 369  * @indio_dev:  pointer to IIO device
 370  *
 371  * The raw ch0 and ch1 values of the ambient light sensed in the last
 372  * integration cycle are read from the device. The raw values are multiplied
 373  * by a device-specific scale factor, and divided by the integration time and
 374  * device gain. The code supports multiple lux equations through the lux table
 375  * coefficients. A lux gain trim is applied to each lux equation, and then the
 376  * maximum lux within the interval 0..65535 is selected.
 377  */
 378 static int tsl2772_get_lux(struct iio_dev *indio_dev)
 379 {
 380         struct tsl2772_chip *chip = iio_priv(indio_dev);
 381         struct tsl2772_lux *p;
 382         int max_lux, ret;
 383         bool overflow;
 384
 385         mutex_lock(&chip->als_mutex);
 386
 387         if (chip->tsl2772_chip_status != TSL2772_CHIP_WORKING) {
 388                 dev_err(&chip->client->dev, "%s: device is not enabled\n",
 389                         __func__);
 390                 ret = -EBUSY;
 391                 goto out_unlock;
 392         }
 393
 394         ret = tsl2772_read_status(chip);
 395         if (ret < 0)
 396                 goto out_unlock;
 397
 398         if (!(ret & TSL2772_STA_ADC_VALID)) {
 399                 dev_err(&chip->client->dev,
 400                         "%s: data not valid yet\n", __func__);
 401                 ret = chip->als_cur_info.lux; /* return LAST VALUE */
 402                 goto out_unlock;
 403         }
 404
 405         ret = tsl2772_read_autoinc_regs(chip, TSL2772_ALS_CHAN0LO,
 406                                         TSL2772_ALS_CHAN0HI);
 407         if (ret < 0)
 408                 goto out_unlock;
 409         chip->als_cur_info.als_ch0 = ret;
 410
 411         ret = tsl2772_read_autoinc_regs(chip, TSL2772_ALS_CHAN1LO,
 412                                         TSL2772_ALS_CHAN1HI);
 413         if (ret < 0)
 414                 goto out_unlock;
 415         chip->als_cur_info.als_ch1 = ret;
 416
 417         if (chip->als_cur_info.als_ch0 >= chip->als_saturation) {
 418                 max_lux = TSL2772_LUX_CALC_OVER_FLOW;
 419                 goto update_struct_with_max_lux;
 420         }
 421
 422         if (!chip->als_cur_info.als_ch0) {
 423                 /* have no data, so return LAST VALUE */
 424                 ret = chip->als_cur_info.lux;
 425                 goto out_unlock;
 426         }
 427
 428         max_lux = 0;
 429         overflow = false;
 430         for (p = (struct tsl2772_lux *)chip->tsl2772_device_lux; p->ch0 != 0;
 431              p++) {
 432                 int lux;
 433
 434                 lux = ((chip->als_cur_info.als_ch0 * p->ch0) -
 435                        (chip->als_cur_info.als_ch1 * p->ch1)) /
 436                         chip->als_gain_time_scale;
 437
 438                 /*
 439                  * The als_gain_trim can have a value within the range 250..4000
 440                  * and is a multiplier for the lux. A trim of 1000 makes no
 441                  * changes to the lux, less than 1000 scales it down, and
 442                  * greater than 1000 scales it up.
 443                  */
 444                 lux = (lux * chip->settings.als_gain_trim) / 1000;
 445
 446                 if (lux > TSL2772_LUX_CALC_OVER_FLOW) {
 447                         overflow = true;
 448                         continue;
 449                 }
 450
 451                 max_lux = max(max_lux, lux);
 452         }
 453
 454         if (overflow && max_lux == 0)
 455                 max_lux = TSL2772_LUX_CALC_OVER_FLOW;
 456
 457 update_struct_with_max_lux:
 458         chip->als_cur_info.lux = max_lux;
 459         ret = max_lux;
 460
 461 out_unlock:
 462         mutex_unlock(&chip->als_mutex);
 463
 464         return ret;
 465 }
 466
 467 /**
 468  * tsl2772_get_prox() - Reads proximity data registers and updates
 469  *                      chip->prox_data.
 470  *
 471  * @indio_dev:  pointer to IIO device
 472  */
 473 static int tsl2772_get_prox(struct iio_dev *indio_dev)
 474 {
 475         struct tsl2772_chip *chip = iio_priv(indio_dev);
 476         int ret;
 477
 478         mutex_lock(&chip->prox_mutex);
 479
 480         ret = tsl2772_read_status(chip);
 481         if (ret < 0)
 482                 goto prox_poll_err;
 483
 484         switch (chip->id) {
 485         case tsl2571:
 486         case tsl2671:
 487         case tmd2671:
 488         case tsl2771:
 489         case tmd2771:
 490                 if (!(ret & TSL2772_STA_ADC_VALID)) {
 491                         ret = -EINVAL;
 492                         goto prox_poll_err;
 493                 }
 494                 break;
 495         case tsl2572:
 496         case tsl2672:
 497         case tmd2672:
 498         case tsl2772:
 499         case tmd2772:
 500                 if (!(ret & TSL2772_STA_PRX_VALID)) {
 501                         ret = -EINVAL;
 502                         goto prox_poll_err;
 503                 }
 504                 break;
 505         }
 506
 507         ret = tsl2772_read_autoinc_regs(chip, TSL2772_PRX_LO, TSL2772_PRX_HI);
 508         if (ret < 0)
 509                 goto prox_poll_err;
 510         chip->prox_data = ret;
 511
 512 prox_poll_err:
 513         mutex_unlock(&chip->prox_mutex);
 514
 515         return ret;
 516 }
 517
 518 /**
 519  * tsl2772_defaults() - Populates the device nominal operating parameters
 520  *                      with those provided by a 'platform' data struct or
 521  *                      with prefined defaults.
 522  *
 523  * @chip:               pointer to device structure.
 524  */
 525 static void tsl2772_defaults(struct tsl2772_chip *chip)
 526 {
 527         /* If Operational settings defined elsewhere.. */
 528         if (chip->pdata && chip->pdata->platform_default_settings)
 529                 memcpy(&chip->settings, chip->pdata->platform_default_settings,
 530                        sizeof(tsl2772_default_settings));
 531         else
 532                 memcpy(&chip->settings, &tsl2772_default_settings,
 533                        sizeof(tsl2772_default_settings));
 534
 535         /* Load up the proper lux table. */
 536         if (chip->pdata && chip->pdata->platform_lux_table[0].ch0 != 0)
 537                 memcpy(chip->tsl2772_device_lux,
 538                        chip->pdata->platform_lux_table,
 539                        sizeof(chip->pdata->platform_lux_table));
 540         else
 541                 memcpy(chip->tsl2772_device_lux,
 542                        tsl2772_default_lux_table_group[chip->id],
 543                        TSL2772_DEFAULT_TABLE_BYTES);
 544 }
 545
 546 /**
 547  * tsl2772_als_calibrate() -    Obtain single reading and calculate
 548  *                              the als_gain_trim.
 549  *
 550  * @indio_dev:  pointer to IIO device
 551  */
 552 static int tsl2772_als_calibrate(struct iio_dev *indio_dev)
 553 {
 554         struct tsl2772_chip *chip = iio_priv(indio_dev);
 555         int ret, lux_val;
 556
 557         ret = i2c_smbus_read_byte_data(chip->client,
 558                                        TSL2772_CMD_REG | TSL2772_CNTRL);
 559         if (ret < 0) {
 560                 dev_err(&chip->client->dev,
 561                         "%s: failed to read from the CNTRL register\n",
 562                         __func__);
 563                 return ret;
 564         }
 565
 566         if ((ret & (TSL2772_CNTL_ADC_ENBL | TSL2772_CNTL_PWR_ON))
 567                         != (TSL2772_CNTL_ADC_ENBL | TSL2772_CNTL_PWR_ON)) {
 568                 dev_err(&chip->client->dev,
 569                         "%s: Device is not powered on and/or ADC is not enabled\n",
 570                         __func__);
 571                 return -EINVAL;
 572         } else if ((ret & TSL2772_STA_ADC_VALID) != TSL2772_STA_ADC_VALID) {
 573                 dev_err(&chip->client->dev,
 574                         "%s: The two ADC channels have not completed an integration cycle\n",
 575                         __func__);
 576                 return -ENODATA;
 577         }
 578
 579         lux_val = tsl2772_get_lux(indio_dev);
 580         if (lux_val < 0) {
 581                 dev_err(&chip->client->dev,
 582                         "%s: failed to get lux\n", __func__);
 583                 return lux_val;
 584         }
 585
 586         ret = (chip->settings.als_cal_target * chip->settings.als_gain_trim) /
 587                         lux_val;
 588         if (ret < TSL2772_ALS_GAIN_TRIM_MIN || ret > TSL2772_ALS_GAIN_TRIM_MAX)
 589                 return -ERANGE;
 590
 591         chip->settings.als_gain_trim = ret;
 592
 593         return ret;
 594 }
 595
 596 static int tsl2772_chip_on(struct iio_dev *indio_dev)
 597 {
 598         struct tsl2772_chip *chip = iio_priv(indio_dev);
 599         int ret, i, als_count, als_time_us;
 600         u8 *dev_reg, reg_val;
 601
 602         /* Non calculated parameters */
 603         chip->tsl2772_config[TSL2772_ALS_TIME] = chip->settings.als_time;
 604         chip->tsl2772_config[TSL2772_PRX_TIME] = chip->settings.prox_time;
 605         chip->tsl2772_config[TSL2772_WAIT_TIME] = chip->settings.wait_time;
 606         chip->tsl2772_config[TSL2772_ALS_PRX_CONFIG] =
 607                 chip->settings.als_prox_config;
 608
 609         chip->tsl2772_config[TSL2772_ALS_MINTHRESHLO] =
 610                 (chip->settings.als_thresh_low) & 0xFF;
 611         chip->tsl2772_config[TSL2772_ALS_MINTHRESHHI] =
 612                 (chip->settings.als_thresh_low >> 8) & 0xFF;
 613         chip->tsl2772_config[TSL2772_ALS_MAXTHRESHLO] =
 614                 (chip->settings.als_thresh_high) & 0xFF;
 615         chip->tsl2772_config[TSL2772_ALS_MAXTHRESHHI] =
 616                 (chip->settings.als_thresh_high >> 8) & 0xFF;
 617         chip->tsl2772_config[TSL2772_PERSISTENCE] =
 618                 (chip->settings.prox_persistence & 0xFF) << 4 |
 619                 (chip->settings.als_persistence & 0xFF);
 620
 621         chip->tsl2772_config[TSL2772_PRX_COUNT] =
 622                         chip->settings.prox_pulse_count;
 623         chip->tsl2772_config[TSL2772_PRX_MINTHRESHLO] =
 624                         (chip->settings.prox_thres_low) & 0xFF;
 625         chip->tsl2772_config[TSL2772_PRX_MINTHRESHHI] =
 626                         (chip->settings.prox_thres_low >> 8) & 0xFF;
 627         chip->tsl2772_config[TSL2772_PRX_MAXTHRESHLO] =
 628                         (chip->settings.prox_thres_high) & 0xFF;
 629         chip->tsl2772_config[TSL2772_PRX_MAXTHRESHHI] =
 630                         (chip->settings.prox_thres_high >> 8) & 0xFF;
 631
 632         /* and make sure we're not already on */
 633         if (chip->tsl2772_chip_status == TSL2772_CHIP_WORKING) {
 634                 /* if forcing a register update - turn off, then on */
 635                 dev_info(&chip->client->dev, "device is already enabled\n");
 636                 return -EINVAL;
 637         }
 638
 639         /* Set the gain based on tsl2772_settings struct */
 640         chip->tsl2772_config[TSL2772_GAIN] =
 641                 (chip->settings.als_gain & 0xFF) |
 642                 ((chip->settings.prox_gain & 0xFF) << 2) |
 643                 (chip->settings.prox_diode << 4) |
 644                 (chip->settings.prox_power << 6);
 645
 646         /* set chip time scaling and saturation */
 647         als_count = 256 - chip->settings.als_time;
 648         als_time_us = als_count * tsl2772_int_time_avail[chip->id][3];
 649         chip->als_saturation = als_count * 768; /* 75% of full scale */
 650         chip->als_gain_time_scale = als_time_us *
 651                 tsl2772_als_gain[chip->settings.als_gain];
 652
 653         /*
 654          * TSL2772 Specific power-on / adc enable sequence
 655          * Power on the device 1st.
 656          */
 657         ret = tsl2772_write_control_reg(chip, TSL2772_CNTL_PWR_ON);
 658         if (ret < 0)
 659                 return ret;
 660
 661         /*
 662          * Use the following shadow copy for our delay before enabling ADC.
 663          * Write all the registers.
 664          */
 665         for (i = 0, dev_reg = chip->tsl2772_config;
 666                         i < TSL2772_MAX_CONFIG_REG; i++) {
 667                 int reg = TSL2772_CMD_REG + i;
 668
 669                 ret = i2c_smbus_write_byte_data(chip->client, reg,
 670                                                 *dev_reg++);
 671                 if (ret < 0) {
 672                         dev_err(&chip->client->dev,
 673                                 "%s: failed to write to register %x: %d\n",
 674                                 __func__, reg, ret);
 675                         return ret;
 676                 }
 677         }
 678
 679         /* Power-on settling time */
 680         usleep_range(3000, 3500);
 681
 682         reg_val = TSL2772_CNTL_PWR_ON | TSL2772_CNTL_ADC_ENBL |
 683                   TSL2772_CNTL_PROX_DET_ENBL;
 684         if (chip->settings.als_interrupt_en)
 685                 reg_val |= TSL2772_CNTL_ALS_INT_ENBL;
 686         if (chip->settings.prox_interrupt_en)
 687                 reg_val |= TSL2772_CNTL_PROX_INT_ENBL;
 688
 689         ret = tsl2772_write_control_reg(chip, reg_val);
 690         if (ret < 0)
 691                 return ret;
 692
 693         ret = i2c_smbus_write_byte(chip->client,
 694                                    TSL2772_CMD_REG | TSL2772_CMD_SPL_FN |
 695                                    TSL2772_CMD_PROXALS_INT_CLR);
 696         if (ret < 0) {
 697                 dev_err(&chip->client->dev,
 698                         "%s: failed to clear interrupt status: %d\n",
 699                         __func__, ret);
 700                 return ret;
 701         }
 702
 703         chip->tsl2772_chip_status = TSL2772_CHIP_WORKING;
 704
 705         return ret;
 706 }
 707
 708 static int tsl2772_chip_off(struct iio_dev *indio_dev)
 709 {
 710         struct tsl2772_chip *chip = iio_priv(indio_dev);
 711
 712         /* turn device off */
 713         chip->tsl2772_chip_status = TSL2772_CHIP_SUSPENDED;
 714         return tsl2772_write_control_reg(chip, 0x00);
 715 }
 716
 717 /**
 718  * tsl2772_invoke_change - power cycle the device to implement the user
 719  *                         parameters
 720  * @indio_dev:  pointer to IIO device
 721  *
 722  * Obtain and lock both ALS and PROX resources, determine and save device state
 723  * (On/Off), cycle device to implement updated parameter, put device back into
 724  * proper state, and unlock resource.
 725  */
 726 static int tsl2772_invoke_change(struct iio_dev *indio_dev)
 727 {
 728         struct tsl2772_chip *chip = iio_priv(indio_dev);
 729         int device_status = chip->tsl2772_chip_status;
 730         int ret;
 731
 732         mutex_lock(&chip->als_mutex);
 733         mutex_lock(&chip->prox_mutex);
 734
 735         if (device_status == TSL2772_CHIP_WORKING) {
 736                 ret = tsl2772_chip_off(indio_dev);
 737                 if (ret < 0)
 738                         goto unlock;
 739         }
 740
 741         ret = tsl2772_chip_on(indio_dev);
 742
 743 unlock:
 744         mutex_unlock(&chip->prox_mutex);
 745         mutex_unlock(&chip->als_mutex);
 746
 747         return ret;
 748 }
 749
 750 static int tsl2772_prox_cal(struct iio_dev *indio_dev)
 751 {
 752         struct tsl2772_chip *chip = iio_priv(indio_dev);
 753         int prox_history[MAX_SAMPLES_CAL + 1];
 754         int i, ret, mean, max, sample_sum;
 755
 756         if (chip->settings.prox_max_samples_cal < 1 ||
 757             chip->settings.prox_max_samples_cal > MAX_SAMPLES_CAL)
 758                 return -EINVAL;
 759
 760         for (i = 0; i < chip->settings.prox_max_samples_cal; i++) {
 761                 usleep_range(15000, 17500);
 762                 ret = tsl2772_get_prox(indio_dev);
 763                 if (ret < 0)
 764                         return ret;
 765
 766                 prox_history[i] = chip->prox_data;
 767         }
 768
 769         sample_sum = 0;
 770         max = INT_MIN;
 771         for (i = 0; i < chip->settings.prox_max_samples_cal; i++) {
 772                 sample_sum += prox_history[i];
 773                 max = max(max, prox_history[i]);
 774         }
 775         mean = sample_sum / chip->settings.prox_max_samples_cal;
 776
 777         chip->settings.prox_thres_high = (max << 1) - mean;
 778
 779         return tsl2772_invoke_change(indio_dev);
 780 }
 781
 782 static int tsl2772_read_avail(struct iio_dev *indio_dev,
 783                               struct iio_chan_spec const *chan,
 784                               const int **vals, int *type, int *length,
 785                               long mask)
 786 {
 787         struct tsl2772_chip *chip = iio_priv(indio_dev);
 788
 789         switch (mask) {
 790         case IIO_CHAN_INFO_CALIBSCALE:
 791                 if (chan->type == IIO_INTENSITY) {
 792                         *length = ARRAY_SIZE(tsl2772_int_calibscale_avail);
 793                         *vals = tsl2772_int_calibscale_avail;
 794                 } else {
 795                         *length = ARRAY_SIZE(tsl2772_prox_calibscale_avail);
 796                         *vals = tsl2772_prox_calibscale_avail;
 797                 }
 798                 *type = IIO_VAL_INT;
 799                 return IIO_AVAIL_LIST;
 800         case IIO_CHAN_INFO_INT_TIME:
 801                 *length = ARRAY_SIZE(tsl2772_int_time_avail[chip->id]);
 802                 *vals = tsl2772_int_time_avail[chip->id];
 803                 *type = IIO_VAL_INT_PLUS_MICRO;
 804                 return IIO_AVAIL_RANGE;
 805         }
 806
 807         return -EINVAL;
 808 }
 809
 810 static ssize_t in_illuminance0_target_input_show(struct device *dev,
 811                                                  struct device_attribute *attr,
 812                                                  char *buf)
 813 {
 814         struct tsl2772_chip *chip = iio_priv(dev_to_iio_dev(dev));
 815
 816         return snprintf(buf, PAGE_SIZE, "%d\n", chip->settings.als_cal_target);
 817 }
 818
 819 static ssize_t in_illuminance0_target_input_store(struct device *dev,
 820                                                   struct device_attribute *attr,
 821                                                   const char *buf, size_t len)
 822 {
 823         struct iio_dev *indio_dev = dev_to_iio_dev(dev);
 824         struct tsl2772_chip *chip = iio_priv(indio_dev);
 825         u16 value;
 826         int ret;
 827
 828         if (kstrtou16(buf, 0, &value))
 829                 return -EINVAL;
 830
 831         chip->settings.als_cal_target = value;
 832         ret = tsl2772_invoke_change(indio_dev);
 833         if (ret < 0)
 834                 return ret;
 835
 836         return len;
 837 }
 838
 839 static ssize_t in_illuminance0_calibrate_store(struct device *dev,
 840                                                struct device_attribute *attr,
 841                                                const char *buf, size_t len)
 842 {
 843         struct iio_dev *indio_dev = dev_to_iio_dev(dev);
 844         bool value;
 845         int ret;
 846
 847         if (kstrtobool(buf, &value) || !value)
 848                 return -EINVAL;
 849
 850         ret = tsl2772_als_calibrate(indio_dev);
 851         if (ret < 0)
 852                 return ret;
 853
 854         ret = tsl2772_invoke_change(indio_dev);
 855         if (ret < 0)
 856                 return ret;
 857
 858         return len;
 859 }
 860
 861 static ssize_t in_illuminance0_lux_table_show(struct device *dev,
 862                                               struct device_attribute *attr,
 863                                               char *buf)
 864 {
 865         struct tsl2772_chip *chip = iio_priv(dev_to_iio_dev(dev));
 866         int i = 0;
 867         int offset = 0;
 868
 869         while (i < TSL2772_MAX_LUX_TABLE_SIZE) {
 870                 offset += snprintf(buf + offset, PAGE_SIZE, "%u,%u,",
 871                         chip->tsl2772_device_lux[i].ch0,
 872                         chip->tsl2772_device_lux[i].ch1);
 873                 if (chip->tsl2772_device_lux[i].ch0 == 0) {
 874                         /*
 875                          * We just printed the first "0" entry.
 876                          * Now get rid of the extra "," and break.
 877                          */
 878                         offset--;
 879                         break;
 880                 }
 881                 i++;
 882         }
 883
 884         offset += snprintf(buf + offset, PAGE_SIZE, "\n");
 885         return offset;
 886 }
 887
 888 static ssize_t in_illuminance0_lux_table_store(struct device *dev,
 889                                                struct device_attribute *attr,
 890                                                const char *buf, size_t len)
 891 {
 892         struct iio_dev *indio_dev = dev_to_iio_dev(dev);
 893         struct tsl2772_chip *chip = iio_priv(indio_dev);
 894         int value[ARRAY_SIZE(chip->tsl2772_device_lux) * 2 + 1];
 895         int n, ret;
 896
 897         get_options(buf, ARRAY_SIZE(value), value);
 898
 899         /*
 900          * We now have an array of ints starting at value[1], and
 901          * enumerated by value[0].
 902          * We expect each group of two ints to be one table entry,
 903          * and the last table entry is all 0.
 904          */
 905         n = value[0];
 906         if ((n % 2) || n < 4 ||
 907             n > ((ARRAY_SIZE(chip->tsl2772_device_lux) - 1) * 2))
 908                 return -EINVAL;
 909
 910         if ((value[(n - 1)] | value[n]) != 0)
 911                 return -EINVAL;
 912
 913         if (chip->tsl2772_chip_status == TSL2772_CHIP_WORKING) {
 914                 ret = tsl2772_chip_off(indio_dev);
 915                 if (ret < 0)
 916                         return ret;
 917         }
 918
 919         /* Zero out the table */
 920         memset(chip->tsl2772_device_lux, 0, sizeof(chip->tsl2772_device_lux));
 921         memcpy(chip->tsl2772_device_lux, &value[1], (value[0] * 4));
 922
 923         ret = tsl2772_invoke_change(indio_dev);
 924         if (ret < 0)
 925                 return ret;
 926
 927         return len;
 928 }
 929
 930 static ssize_t in_proximity0_calibrate_store(struct device *dev,
 931                                              struct device_attribute *attr,
 932                                              const char *buf, size_t len)
 933 {
 934         struct iio_dev *indio_dev = dev_to_iio_dev(dev);
 935         bool value;
 936         int ret;
 937
 938         if (kstrtobool(buf, &value) || !value)
 939                 return -EINVAL;
 940
 941         ret = tsl2772_prox_cal(indio_dev);
 942         if (ret < 0)
 943                 return ret;
 944
 945         ret = tsl2772_invoke_change(indio_dev);
 946         if (ret < 0)
 947                 return ret;
 948
 949         return len;
 950 }
 951
 952 static int tsl2772_read_interrupt_config(struct iio_dev *indio_dev,
 953                                          const struct iio_chan_spec *chan,
 954                                          enum iio_event_type type,
 955                                          enum iio_event_direction dir)
 956 {
 957         struct tsl2772_chip *chip = iio_priv(indio_dev);
 958
 959         if (chan->type == IIO_INTENSITY)
 960                 return chip->settings.als_interrupt_en;
 961         else
 962                 return chip->settings.prox_interrupt_en;
 963 }
 964
 965 static int tsl2772_write_interrupt_config(struct iio_dev *indio_dev,
 966                                           const struct iio_chan_spec *chan,
 967                                           enum iio_event_type type,
 968                                           enum iio_event_direction dir,
 969                                           int val)
 970 {
 971         struct tsl2772_chip *chip = iio_priv(indio_dev);
 972
 973         if (chan->type == IIO_INTENSITY)
 974                 chip->settings.als_interrupt_en = val ? true : false;
 975         else
 976                 chip->settings.prox_interrupt_en = val ? true : false;
 977
 978         return tsl2772_invoke_change(indio_dev);
 979 }
 980
 981 static int tsl2772_write_event_value(struct iio_dev *indio_dev,
 982                                      const struct iio_chan_spec *chan,
 983                                      enum iio_event_type type,
 984                                      enum iio_event_direction dir,
 985                                      enum iio_event_info info,
 986                                      int val, int val2)
 987 {
 988         struct tsl2772_chip *chip = iio_priv(indio_dev);
 989         int ret = -EINVAL, count, persistence;
 990         u8 time;
 991
 992         switch (info) {
 993         case IIO_EV_INFO_VALUE:
 994                 if (chan->type == IIO_INTENSITY) {
 995                         switch (dir) {
 996                         case IIO_EV_DIR_RISING:
 997                                 chip->settings.als_thresh_high = val;
 998                                 ret = 0;
 999                                 break;
1000                         case IIO_EV_DIR_FALLING:
1001                                 chip->settings.als_thresh_low = val;
1002                                 ret = 0;
1003                                 break;
1004                         default:
1005                                 break;
1006                         }
1007                 } else {
1008                         switch (dir) {
1009                         case IIO_EV_DIR_RISING:
1010                                 chip->settings.prox_thres_high = val;
1011                                 ret = 0;
1012                                 break;
1013                         case IIO_EV_DIR_FALLING:
1014                                 chip->settings.prox_thres_low = val;
1015                                 ret = 0;
1016                                 break;
1017                         default:
1018                                 break;
1019                         }
1020                 }
1021                 break;
1022         case IIO_EV_INFO_PERIOD:
1023                 if (chan->type == IIO_INTENSITY)
1024                         time = chip->settings.als_time;
1025                 else
1026                         time = chip->settings.prox_time;
1027
1028                 count = 256 - time;
1029                 persistence = ((val * 1000000) + val2) /
1030                         (count * tsl2772_int_time_avail[chip->id][3]);
1031
1032                 if (chan->type == IIO_INTENSITY) {
1033                         /* ALS filter values are 1, 2, 3, 5, 10, 15, ..., 60 */
1034                         if (persistence > 3)
1035                                 persistence = (persistence / 5) + 3;
1036
1037                         chip->settings.als_persistence = persistence;
1038                 } else {
1039                         chip->settings.prox_persistence = persistence;
1040                 }
1041
1042                 ret = 0;
1043                 break;
1044         default:
1045                 break;
1046         }
1047
1048         if (ret < 0)
1049                 return ret;
1050
1051         return tsl2772_invoke_change(indio_dev);
1052 }
1053
1054 static int tsl2772_read_event_value(struct iio_dev *indio_dev,
1055                                     const struct iio_chan_spec *chan,
1056                                     enum iio_event_type type,
1057                                     enum iio_event_direction dir,
1058                                     enum iio_event_info info,
1059                                     int *val, int *val2)
1060 {
1061         struct tsl2772_chip *chip = iio_priv(indio_dev);
1062         int filter_delay, persistence;
1063         u8 time;
1064
1065         switch (info) {
1066         case IIO_EV_INFO_VALUE:
1067                 if (chan->type == IIO_INTENSITY) {
1068                         switch (dir) {
1069                         case IIO_EV_DIR_RISING:
1070                                 *val = chip->settings.als_thresh_high;
1071                                 return IIO_VAL_INT;
1072                         case IIO_EV_DIR_FALLING:
1073                                 *val = chip->settings.als_thresh_low;
1074                                 return IIO_VAL_INT;
1075                         default:
1076                                 return -EINVAL;
1077                         }
1078                 } else {
1079                         switch (dir) {
1080                         case IIO_EV_DIR_RISING:
1081                                 *val = chip->settings.prox_thres_high;
1082                                 return IIO_VAL_INT;
1083                         case IIO_EV_DIR_FALLING:
1084                                 *val = chip->settings.prox_thres_low;
1085                                 return IIO_VAL_INT;
1086                         default:
1087                                 return -EINVAL;
1088                         }
1089                 }
1090                 break;
1091         case IIO_EV_INFO_PERIOD:
1092                 if (chan->type == IIO_INTENSITY) {
1093                         time = chip->settings.als_time;
1094                         persistence = chip->settings.als_persistence;
1095
1096                         /* ALS filter values are 1, 2, 3, 5, 10, 15, ..., 60 */
1097                         if (persistence > 3)
1098                                 persistence = (persistence - 3) * 5;
1099                 } else {
1100                         time = chip->settings.prox_time;
1101                         persistence = chip->settings.prox_persistence;
1102                 }
1103
1104                 filter_delay = persistence * (256 - time) *
1105                         tsl2772_int_time_avail[chip->id][3];
1106
1107                 *val = filter_delay / 1000000;
1108                 *val2 = filter_delay % 1000000;
1109                 return IIO_VAL_INT_PLUS_MICRO;
1110         default:
1111                 return -EINVAL;
1112         }
1113 }
1114
1115 static int tsl2772_read_raw(struct iio_dev *indio_dev,
1116                             struct iio_chan_spec const *chan,
1117                             int *val,
1118                             int *val2,
1119                             long mask)
1120 {
1121         struct tsl2772_chip *chip = iio_priv(indio_dev);
1122
1123         switch (mask) {
1124         case IIO_CHAN_INFO_PROCESSED:
1125                 switch (chan->type) {
1126                 case IIO_LIGHT:
1127                         tsl2772_get_lux(indio_dev);
1128                         *val = chip->als_cur_info.lux;
1129                         return IIO_VAL_INT;
1130                 default:
1131                         return -EINVAL;
1132                 }
1133         case IIO_CHAN_INFO_RAW:
1134                 switch (chan->type) {
1135                 case IIO_INTENSITY:
1136                         tsl2772_get_lux(indio_dev);
1137                         if (chan->channel == 0)
1138                                 *val = chip->als_cur_info.als_ch0;
1139                         else
1140                                 *val = chip->als_cur_info.als_ch1;
1141                         return IIO_VAL_INT;
1142                 case IIO_PROXIMITY:
1143                         tsl2772_get_prox(indio_dev);
1144                         *val = chip->prox_data;
1145                         return IIO_VAL_INT;
1146                 default:
1147                         return -EINVAL;
1148                 }
1149                 break;
1150         case IIO_CHAN_INFO_CALIBSCALE:
1151                 if (chan->type == IIO_LIGHT)
1152                         *val = tsl2772_als_gain[chip->settings.als_gain];
1153                 else
1154                         *val = tsl2772_prox_gain[chip->settings.prox_gain];
1155                 return IIO_VAL_INT;
1156         case IIO_CHAN_INFO_CALIBBIAS:
1157                 *val = chip->settings.als_gain_trim;
1158                 return IIO_VAL_INT;
1159         case IIO_CHAN_INFO_INT_TIME:
1160                 *val = 0;
1161                 *val2 = (256 - chip->settings.als_time) *
1162                         tsl2772_int_time_avail[chip->id][3];
1163                 return IIO_VAL_INT_PLUS_MICRO;
1164         default:
1165                 return -EINVAL;
1166         }
1167 }
1168
1169 static int tsl2772_write_raw(struct iio_dev *indio_dev,
1170                              struct iio_chan_spec const *chan,
1171                              int val,
1172                              int val2,
1173                              long mask)
1174 {
1175         struct tsl2772_chip *chip = iio_priv(indio_dev);
1176
1177         switch (mask) {
1178         case IIO_CHAN_INFO_CALIBSCALE:
1179                 if (chan->type == IIO_INTENSITY) {
1180                         switch (val) {
1181                         case 1:
1182                                 chip->settings.als_gain = 0;
1183                                 break;
1184                         case 8:
1185                                 chip->settings.als_gain = 1;
1186                                 break;
1187                         case 16:
1188                                 chip->settings.als_gain = 2;
1189                                 break;
1190                         case 120:
1191                                 chip->settings.als_gain = 3;
1192                                 break;
1193                         default:
1194                                 return -EINVAL;
1195                         }
1196                 } else {
1197                         switch (val) {
1198                         case 1:
1199                                 chip->settings.prox_gain = 0;
1200                                 break;
1201                         case 2:
1202                                 chip->settings.prox_gain = 1;
1203                                 break;
1204                         case 4:
1205                                 chip->settings.prox_gain = 2;
1206                                 break;
1207                         case 8:
1208                                 chip->settings.prox_gain = 3;
1209                                 break;
1210                         default:
1211                                 return -EINVAL;
1212                         }
1213                 }
1214                 break;
1215         case IIO_CHAN_INFO_CALIBBIAS:
1216                 if (val < TSL2772_ALS_GAIN_TRIM_MIN ||
1217                     val > TSL2772_ALS_GAIN_TRIM_MAX)
1218                         return -EINVAL;
1219
1220                 chip->settings.als_gain_trim = val;
1221                 break;
1222         case IIO_CHAN_INFO_INT_TIME:
1223                 if (val != 0 || val2 < tsl2772_int_time_avail[chip->id][1] ||
1224                     val2 > tsl2772_int_time_avail[chip->id][5])
1225                         return -EINVAL;
1226
1227                 chip->settings.als_time = 256 -
1228                         (val2 / tsl2772_int_time_avail[chip->id][3]);
1229                 break;
1230         default:
1231                 return -EINVAL;
1232         }
1233
1234         return tsl2772_invoke_change(indio_dev);
1235 }
1236
1237 static DEVICE_ATTR_RW(in_illuminance0_target_input);
1238
1239 static DEVICE_ATTR_WO(in_illuminance0_calibrate);
1240
1241 static DEVICE_ATTR_WO(in_proximity0_calibrate);
1242
1243 static DEVICE_ATTR_RW(in_illuminance0_lux_table);
1244
1245 /* Use the default register values to identify the Taos device */
1246 static int tsl2772_device_id_verif(int id, int target)
1247 {
1248         switch (target) {
1249         case tsl2571:
1250         case tsl2671:
1251         case tsl2771:
1252                 return (id & 0xf0) == TRITON_ID;
1253         case tmd2671:
1254         case tmd2771:
1255                 return (id & 0xf0) == HALIBUT_ID;
1256         case tsl2572:
1257         case tsl2672:
1258         case tmd2672:
1259         case tsl2772:
1260         case tmd2772:
1261                 return (id & 0xf0) == SWORDFISH_ID;
1262         }
1263
1264         return -EINVAL;
1265 }
1266
1267 static irqreturn_t tsl2772_event_handler(int irq, void *private)
1268 {
1269         struct iio_dev *indio_dev = private;
1270         struct tsl2772_chip *chip = iio_priv(indio_dev);
1271         s64 timestamp = iio_get_time_ns(indio_dev);
1272         int ret;
1273
1274         ret = tsl2772_read_status(chip);
1275         if (ret < 0)
1276                 return IRQ_HANDLED;
1277
1278         /* What type of interrupt do we need to process */
1279         if (ret & TSL2772_STA_PRX_INTR) {
1280                 iio_push_event(indio_dev,
1281                                IIO_UNMOD_EVENT_CODE(IIO_PROXIMITY,
1282                                                     0,
1283                                                     IIO_EV_TYPE_THRESH,
1284                                                     IIO_EV_DIR_EITHER),
1285                                timestamp);
1286         }
1287
1288         if (ret & TSL2772_STA_ALS_INTR) {
1289                 iio_push_event(indio_dev,
1290                                IIO_UNMOD_EVENT_CODE(IIO_LIGHT,
1291                                                     0,
1292                                                     IIO_EV_TYPE_THRESH,
1293                                                     IIO_EV_DIR_EITHER),
1294                                timestamp);
1295         }
1296
1297         ret = i2c_smbus_write_byte(chip->client,
1298                                    TSL2772_CMD_REG | TSL2772_CMD_SPL_FN |
1299                                    TSL2772_CMD_PROXALS_INT_CLR);
1300         if (ret < 0)
1301                 dev_err(&chip->client->dev,
1302                         "%s: failed to clear interrupt status: %d\n",
1303                         __func__, ret);
1304
1305         return IRQ_HANDLED;
1306 }
1307
1308 static struct attribute *tsl2772_ALS_device_attrs[] = {
1309         &dev_attr_in_illuminance0_target_input.attr,
1310         &dev_attr_in_illuminance0_calibrate.attr,
1311         &dev_attr_in_illuminance0_lux_table.attr,
1312         NULL
1313 };
1314
1315 static struct attribute *tsl2772_PRX_device_attrs[] = {
1316         &dev_attr_in_proximity0_calibrate.attr,
1317         NULL
1318 };
1319
1320 static struct attribute *tsl2772_ALSPRX_device_attrs[] = {
1321         &dev_attr_in_illuminance0_target_input.attr,
1322         &dev_attr_in_illuminance0_calibrate.attr,
1323         &dev_attr_in_illuminance0_lux_table.attr,
1324         NULL
1325 };
1326
1327 static struct attribute *tsl2772_PRX2_device_attrs[] = {
1328         &dev_attr_in_proximity0_calibrate.attr,
1329         NULL
1330 };
1331
1332 static struct attribute *tsl2772_ALSPRX2_device_attrs[] = {
1333         &dev_attr_in_illuminance0_target_input.attr,
1334         &dev_attr_in_illuminance0_calibrate.attr,
1335         &dev_attr_in_illuminance0_lux_table.attr,
1336         &dev_attr_in_proximity0_calibrate.attr,
1337         NULL
1338 };
1339
1340 static const struct attribute_group tsl2772_device_attr_group_tbl[] = {
1341         [ALS] = {
1342                 .attrs = tsl2772_ALS_device_attrs,
1343         },
1344         [PRX] = {
1345                 .attrs = tsl2772_PRX_device_attrs,
1346         },
1347         [ALSPRX] = {
1348                 .attrs = tsl2772_ALSPRX_device_attrs,
1349         },
1350         [PRX2] = {
1351                 .attrs = tsl2772_PRX2_device_attrs,
1352         },
1353         [ALSPRX2] = {
1354                 .attrs = tsl2772_ALSPRX2_device_attrs,
1355         },
1356 };
1357
1358 #define TSL2772_DEVICE_INFO(type)[type] = \
1359         { \
1360                 .attrs = &tsl2772_device_attr_group_tbl[type], \
1361                 .read_raw = &tsl2772_read_raw, \
1362                 .read_avail = &tsl2772_read_avail, \
1363                 .write_raw = &tsl2772_write_raw, \
1364                 .read_event_value = &tsl2772_read_event_value, \
1365                 .write_event_value = &tsl2772_write_event_value, \
1366                 .read_event_config = &tsl2772_read_interrupt_config, \
1367                 .write_event_config = &tsl2772_write_interrupt_config, \
1368         }
1369
1370 static const struct iio_info tsl2772_device_info[] = {
1371         TSL2772_DEVICE_INFO(ALS),
1372         TSL2772_DEVICE_INFO(PRX),
1373         TSL2772_DEVICE_INFO(ALSPRX),
1374         TSL2772_DEVICE_INFO(PRX2),
1375         TSL2772_DEVICE_INFO(ALSPRX2),
1376 };
1377
1378 static const struct iio_event_spec tsl2772_events[] = {
1379         {
1380                 .type = IIO_EV_TYPE_THRESH,
1381                 .dir = IIO_EV_DIR_RISING,
1382                 .mask_separate = BIT(IIO_EV_INFO_VALUE),
1383         }, {
1384                 .type = IIO_EV_TYPE_THRESH,
1385                 .dir = IIO_EV_DIR_FALLING,
1386                 .mask_separate = BIT(IIO_EV_INFO_VALUE),
1387         }, {
1388                 .type = IIO_EV_TYPE_THRESH,
1389                 .dir = IIO_EV_DIR_EITHER,
1390                 .mask_separate = BIT(IIO_EV_INFO_PERIOD) |
1391                         BIT(IIO_EV_INFO_ENABLE),
1392         },
1393 };
1394
1395 static const struct tsl2772_chip_info tsl2772_chip_info_tbl[] = {
1396         [ALS] = {
1397                 .channel_with_events = {
1398                         {
1399                         .type = IIO_LIGHT,
1400                         .indexed = 1,
1401                         .channel = 0,
1402                         .info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED),
1403                         }, {
1404                         .type = IIO_INTENSITY,
1405                         .indexed = 1,
1406                         .channel = 0,
1407                         .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
1408                                 BIT(IIO_CHAN_INFO_INT_TIME) |
1409                                 BIT(IIO_CHAN_INFO_CALIBSCALE) |
1410                                 BIT(IIO_CHAN_INFO_CALIBBIAS),
1411                         .info_mask_separate_available =
1412                                 BIT(IIO_CHAN_INFO_INT_TIME) |
1413                                 BIT(IIO_CHAN_INFO_CALIBSCALE),
1414                         .event_spec = tsl2772_events,
1415                         .num_event_specs = ARRAY_SIZE(tsl2772_events),
1416                         }, {
1417                         .type = IIO_INTENSITY,
1418                         .indexed = 1,
1419                         .channel = 1,
1420                         },
1421                 },
1422                 .channel_without_events = {
1423                         {
1424                         .type = IIO_LIGHT,
1425                         .indexed = 1,
1426                         .channel = 0,
1427                         .info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED),
1428                         }, {
1429                         .type = IIO_INTENSITY,
1430                         .indexed = 1,
1431                         .channel = 0,
1432                         .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
1433                                 BIT(IIO_CHAN_INFO_INT_TIME) |
1434                                 BIT(IIO_CHAN_INFO_CALIBSCALE) |
1435                                 BIT(IIO_CHAN_INFO_CALIBBIAS),
1436                         .info_mask_separate_available =
1437                                 BIT(IIO_CHAN_INFO_INT_TIME) |
1438                                 BIT(IIO_CHAN_INFO_CALIBSCALE),
1439                         }, {
1440                         .type = IIO_INTENSITY,
1441                         .indexed = 1,
1442                         .channel = 1,
1443                         },
1444                 },
1445                 .chan_table_elements = 3,
1446                 .info = &tsl2772_device_info[ALS],
1447         },
1448         [PRX] = {
1449                 .channel_with_events = {
1450                         {
1451                         .type = IIO_PROXIMITY,
1452                         .indexed = 1,
1453                         .channel = 0,
1454                         .info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
1455                         .event_spec = tsl2772_events,
1456                         .num_event_specs = ARRAY_SIZE(tsl2772_events),
1457                         },
1458                 },
1459                 .channel_without_events = {
1460                         {
1461                         .type = IIO_PROXIMITY,
1462                         .indexed = 1,
1463                         .channel = 0,
1464                         .info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
1465                         },
1466                 },
1467                 .chan_table_elements = 1,
1468                 .info = &tsl2772_device_info[PRX],
1469         },
1470         [ALSPRX] = {
1471                 .channel_with_events = {
1472                         {
1473                         .type = IIO_LIGHT,
1474                         .indexed = 1,
1475                         .channel = 0,
1476                         .info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED),
1477                         }, {
1478                         .type = IIO_INTENSITY,
1479                         .indexed = 1,
1480                         .channel = 0,
1481                         .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
1482                                 BIT(IIO_CHAN_INFO_INT_TIME) |
1483                                 BIT(IIO_CHAN_INFO_CALIBSCALE) |
1484                                 BIT(IIO_CHAN_INFO_CALIBBIAS),
1485                         .info_mask_separate_available =
1486                                 BIT(IIO_CHAN_INFO_INT_TIME) |
1487                                 BIT(IIO_CHAN_INFO_CALIBSCALE),
1488                         .event_spec = tsl2772_events,
1489                         .num_event_specs = ARRAY_SIZE(tsl2772_events),
1490                         }, {
1491                         .type = IIO_INTENSITY,
1492                         .indexed = 1,
1493                         .channel = 1,
1494                         .info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
1495                         }, {
1496                         .type = IIO_PROXIMITY,
1497                         .indexed = 1,
1498                         .channel = 0,
1499                         .info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
1500                         .event_spec = tsl2772_events,
1501                         .num_event_specs = ARRAY_SIZE(tsl2772_events),
1502                         },
1503                 },
1504                 .channel_without_events = {
1505                         {
1506                         .type = IIO_LIGHT,
1507                         .indexed = 1,
1508                         .channel = 0,
1509                         .info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED),
1510                         }, {
1511                         .type = IIO_INTENSITY,
1512                         .indexed = 1,
1513                         .channel = 0,
1514                         .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
1515                                 BIT(IIO_CHAN_INFO_INT_TIME) |
1516                                 BIT(IIO_CHAN_INFO_CALIBSCALE) |
1517                                 BIT(IIO_CHAN_INFO_CALIBBIAS),
1518                         .info_mask_separate_available =
1519                                 BIT(IIO_CHAN_INFO_INT_TIME) |
1520                                 BIT(IIO_CHAN_INFO_CALIBSCALE),
1521                         }, {
1522                         .type = IIO_INTENSITY,
1523                         .indexed = 1,
1524                         .channel = 1,
1525                         .info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
1526                         }, {
1527                         .type = IIO_PROXIMITY,
1528                         .indexed = 1,
1529                         .channel = 0,
1530                         .info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
1531                         },
1532                 },
1533                 .chan_table_elements = 4,
1534                 .info = &tsl2772_device_info[ALSPRX],
1535         },
1536         [PRX2] = {
1537                 .channel_with_events = {
1538                         {
1539                         .type = IIO_PROXIMITY,
1540                         .indexed = 1,
1541                         .channel = 0,
1542                         .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
1543                                 BIT(IIO_CHAN_INFO_CALIBSCALE),
1544                         .info_mask_separate_available =
1545                                 BIT(IIO_CHAN_INFO_CALIBSCALE),
1546                         .event_spec = tsl2772_events,
1547                         .num_event_specs = ARRAY_SIZE(tsl2772_events),
1548                         },
1549                 },
1550                 .channel_without_events = {
1551                         {
1552                         .type = IIO_PROXIMITY,
1553                         .indexed = 1,
1554                         .channel = 0,
1555                         .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
1556                                 BIT(IIO_CHAN_INFO_CALIBSCALE),
1557                         .info_mask_separate_available =
1558                                 BIT(IIO_CHAN_INFO_CALIBSCALE),
1559                         },
1560                 },
1561                 .chan_table_elements = 1,
1562                 .info = &tsl2772_device_info[PRX2],
1563         },
1564         [ALSPRX2] = {
1565                 .channel_with_events = {
1566                         {
1567                         .type = IIO_LIGHT,
1568                         .indexed = 1,
1569                         .channel = 0,
1570                         .info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED),
1571                         }, {
1572                         .type = IIO_INTENSITY,
1573                         .indexed = 1,
1574                         .channel = 0,
1575                         .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
1576                                 BIT(IIO_CHAN_INFO_INT_TIME) |
1577                                 BIT(IIO_CHAN_INFO_CALIBSCALE) |
1578                                 BIT(IIO_CHAN_INFO_CALIBBIAS),
1579                         .info_mask_separate_available =
1580                                 BIT(IIO_CHAN_INFO_INT_TIME) |
1581                                 BIT(IIO_CHAN_INFO_CALIBSCALE),
1582                         .event_spec = tsl2772_events,
1583                         .num_event_specs = ARRAY_SIZE(tsl2772_events),
1584                         }, {
1585                         .type = IIO_INTENSITY,
1586                         .indexed = 1,
1587                         .channel = 1,
1588                         .info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
1589                         }, {
1590                         .type = IIO_PROXIMITY,
1591                         .indexed = 1,
1592                         .channel = 0,
1593                         .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
1594                                 BIT(IIO_CHAN_INFO_CALIBSCALE),
1595                         .info_mask_separate_available =
1596                                 BIT(IIO_CHAN_INFO_CALIBSCALE),
1597                         .event_spec = tsl2772_events,
1598                         .num_event_specs = ARRAY_SIZE(tsl2772_events),
1599                         },
1600                 },
1601                 .channel_without_events = {
1602                         {
1603                         .type = IIO_LIGHT,
1604                         .indexed = 1,
1605                         .channel = 0,
1606                         .info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED),
1607                         }, {
1608                         .type = IIO_INTENSITY,
1609                         .indexed = 1,
1610                         .channel = 0,
1611                         .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
1612                                 BIT(IIO_CHAN_INFO_INT_TIME) |
1613                                 BIT(IIO_CHAN_INFO_CALIBSCALE) |
1614                                 BIT(IIO_CHAN_INFO_CALIBBIAS),
1615                         .info_mask_separate_available =
1616                                 BIT(IIO_CHAN_INFO_INT_TIME) |
1617                                 BIT(IIO_CHAN_INFO_CALIBSCALE),
1618                         }, {
1619                         .type = IIO_INTENSITY,
1620                         .indexed = 1,
1621                         .channel = 1,
1622                         .info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
1623                         }, {
1624                         .type = IIO_PROXIMITY,
1625                         .indexed = 1,
1626                         .channel = 0,
1627                         .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
1628                                 BIT(IIO_CHAN_INFO_CALIBSCALE),
1629                         .info_mask_separate_available =
1630                                 BIT(IIO_CHAN_INFO_CALIBSCALE),
1631                         },
1632                 },
1633                 .chan_table_elements = 4,
1634                 .info = &tsl2772_device_info[ALSPRX2],
1635         },
1636 };
1637
1638 static int tsl2772_probe(struct i2c_client *clientp,
1639                          const struct i2c_device_id *id)
1640 {
1641         struct iio_dev *indio_dev;
1642         struct tsl2772_chip *chip;
1643         int ret;
1644
1645         indio_dev = devm_iio_device_alloc(&clientp->dev, sizeof(*chip));
1646         if (!indio_dev)
1647                 return -ENOMEM;
1648
1649         chip = iio_priv(indio_dev);
1650         chip->client = clientp;
1651         i2c_set_clientdata(clientp, indio_dev);
1652
1653         ret = i2c_smbus_read_byte_data(chip->client,
1654                                        TSL2772_CMD_REG | TSL2772_CHIPID);
1655         if (ret < 0)
1656                 return ret;
1657
1658         if (tsl2772_device_id_verif(ret, id->driver_data) <= 0) {
1659                 dev_info(&chip->client->dev,
1660                          "%s: i2c device found does not match expected id\n",
1661                                 __func__);
1662                 return -EINVAL;
1663         }
1664
1665         ret = i2c_smbus_write_byte(clientp, TSL2772_CMD_REG | TSL2772_CNTRL);
1666         if (ret < 0) {
1667                 dev_err(&clientp->dev,
1668                         "%s: Failed to write to CMD register: %d\n",
1669                         __func__, ret);
1670                 return ret;
1671         }
1672
1673         mutex_init(&chip->als_mutex);
1674         mutex_init(&chip->prox_mutex);
1675
1676         chip->tsl2772_chip_status = TSL2772_CHIP_UNKNOWN;
1677         chip->pdata = dev_get_platdata(&clientp->dev);
1678         chip->id = id->driver_data;
1679         chip->chip_info =
1680                 &tsl2772_chip_info_tbl[device_channel_config[id->driver_data]];
1681
1682         indio_dev->info = chip->chip_info->info;
1683         indio_dev->dev.parent = &clientp->dev;
1684         indio_dev->modes = INDIO_DIRECT_MODE;
1685         indio_dev->name = chip->client->name;
1686         indio_dev->num_channels = chip->chip_info->chan_table_elements;
1687
1688         if (clientp->irq) {
1689                 indio_dev->channels = chip->chip_info->channel_with_events;
1690
1691                 ret = devm_request_threaded_irq(&clientp->dev, clientp->irq,
1692                                                 NULL,
1693                                                 &tsl2772_event_handler,
1694                                                 IRQF_TRIGGER_FALLING |
1695                                                 IRQF_ONESHOT,
1696                                                 "TSL2772_event",
1697                                                 indio_dev);
1698                 if (ret) {
1699                         dev_err(&clientp->dev,
1700                                 "%s: irq request failed\n", __func__);
1701                         return ret;
1702                 }
1703         } else {
1704                 indio_dev->channels = chip->chip_info->channel_without_events;
1705         }
1706
1707         tsl2772_defaults(chip);
1708         ret = tsl2772_chip_on(indio_dev);
1709         if (ret < 0)
1710                 return ret;
1711
1712         ret = iio_device_register(indio_dev);
1713         if (ret) {
1714                 tsl2772_chip_off(indio_dev);
1715                 dev_err(&clientp->dev,
1716                         "%s: iio registration failed\n", __func__);
1717                 return ret;
1718         }
1719
1720         return 0;
1721 }
1722
1723 static int tsl2772_suspend(struct device *dev)
1724 {
1725         struct iio_dev *indio_dev = dev_get_drvdata(dev);
1726
1727         return tsl2772_chip_off(indio_dev);
1728 }
1729
1730 static int tsl2772_resume(struct device *dev)
1731 {
1732         struct iio_dev *indio_dev = dev_get_drvdata(dev);
1733
1734         return tsl2772_chip_on(indio_dev);
1735 }
1736
1737 static int tsl2772_remove(struct i2c_client *client)
1738 {
1739         struct iio_dev *indio_dev = i2c_get_clientdata(client);
1740
1741         tsl2772_chip_off(indio_dev);
1742
1743         iio_device_unregister(indio_dev);
1744
1745         return 0;
1746 }
1747
1748 static const struct i2c_device_id tsl2772_idtable[] = {
1749         { "tsl2571", tsl2571 },
1750         { "tsl2671", tsl2671 },
1751         { "tmd2671", tmd2671 },
1752         { "tsl2771", tsl2771 },
1753         { "tmd2771", tmd2771 },
1754         { "tsl2572", tsl2572 },
1755         { "tsl2672", tsl2672 },
1756         { "tmd2672", tmd2672 },
1757         { "tsl2772", tsl2772 },
1758         { "tmd2772", tmd2772 },
1759         {}
1760 };
1761
1762 MODULE_DEVICE_TABLE(i2c, tsl2772_idtable);
1763
1764 static const struct of_device_id tsl2772_of_match[] = {
1765         { .compatible = "amstaos,tsl2571" },
1766         { .compatible = "amstaos,tsl2671" },
1767         { .compatible = "amstaos,tmd2671" },
1768         { .compatible = "amstaos,tsl2771" },
1769         { .compatible = "amstaos,tmd2771" },
1770         { .compatible = "amstaos,tsl2572" },
1771         { .compatible = "amstaos,tsl2672" },
1772         { .compatible = "amstaos,tmd2672" },
1773         { .compatible = "amstaos,tsl2772" },
1774         { .compatible = "amstaos,tmd2772" },
1775         {}
1776 };
1777 MODULE_DEVICE_TABLE(of, tsl2772_of_match);
1778
1779 static const struct dev_pm_ops tsl2772_pm_ops = {
1780         .suspend = tsl2772_suspend,
1781         .resume  = tsl2772_resume,
1782 };
1783
1784 static struct i2c_driver tsl2772_driver = {
1785         .driver = {
1786                 .name = "tsl2772",
1787                 .of_match_table = tsl2772_of_match,
1788                 .pm = &tsl2772_pm_ops,
1789         },
1790         .id_table = tsl2772_idtable,
1791         .probe = tsl2772_probe,
1792         .remove = tsl2772_remove,
1793 };
1794
1795 module_i2c_driver(tsl2772_driver);
1796
1797 MODULE_AUTHOR("J. August Brenner <Jon.Brenner@ams.com>");
1798 MODULE_AUTHOR("Brian Masney <masneyb@onstation.org>");
1799 MODULE_DESCRIPTION("TAOS tsl2772 ambient and proximity light sensor driver");
1800 MODULE_LICENSE("GPL");