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         if (lux_val == 0)
 586                 return -ERANGE;
 587
 588         ret = (chip->settings.als_cal_target * chip->settings.als_gain_trim) /
 589                         lux_val;
 590         if (ret < TSL2772_ALS_GAIN_TRIM_MIN || ret > TSL2772_ALS_GAIN_TRIM_MAX)
 591                 return -ERANGE;
 592
 593         chip->settings.als_gain_trim = ret;
 594
 595         return ret;
 596 }
 597
 598 static int tsl2772_chip_on(struct iio_dev *indio_dev)
 599 {
 600         struct tsl2772_chip *chip = iio_priv(indio_dev);
 601         int ret, i, als_count, als_time_us;
 602         u8 *dev_reg, reg_val;
 603
 604         /* Non calculated parameters */
 605         chip->tsl2772_config[TSL2772_ALS_TIME] = chip->settings.als_time;
 606         chip->tsl2772_config[TSL2772_PRX_TIME] = chip->settings.prox_time;
 607         chip->tsl2772_config[TSL2772_WAIT_TIME] = chip->settings.wait_time;
 608         chip->tsl2772_config[TSL2772_ALS_PRX_CONFIG] =
 609                 chip->settings.als_prox_config;
 610
 611         chip->tsl2772_config[TSL2772_ALS_MINTHRESHLO] =
 612                 (chip->settings.als_thresh_low) & 0xFF;
 613         chip->tsl2772_config[TSL2772_ALS_MINTHRESHHI] =
 614                 (chip->settings.als_thresh_low >> 8) & 0xFF;
 615         chip->tsl2772_config[TSL2772_ALS_MAXTHRESHLO] =
 616                 (chip->settings.als_thresh_high) & 0xFF;
 617         chip->tsl2772_config[TSL2772_ALS_MAXTHRESHHI] =
 618                 (chip->settings.als_thresh_high >> 8) & 0xFF;
 619         chip->tsl2772_config[TSL2772_PERSISTENCE] =
 620                 (chip->settings.prox_persistence & 0xFF) << 4 |
 621                 (chip->settings.als_persistence & 0xFF);
 622
 623         chip->tsl2772_config[TSL2772_PRX_COUNT] =
 624                         chip->settings.prox_pulse_count;
 625         chip->tsl2772_config[TSL2772_PRX_MINTHRESHLO] =
 626                         (chip->settings.prox_thres_low) & 0xFF;
 627         chip->tsl2772_config[TSL2772_PRX_MINTHRESHHI] =
 628                         (chip->settings.prox_thres_low >> 8) & 0xFF;
 629         chip->tsl2772_config[TSL2772_PRX_MAXTHRESHLO] =
 630                         (chip->settings.prox_thres_high) & 0xFF;
 631         chip->tsl2772_config[TSL2772_PRX_MAXTHRESHHI] =
 632                         (chip->settings.prox_thres_high >> 8) & 0xFF;
 633
 634         /* and make sure we're not already on */
 635         if (chip->tsl2772_chip_status == TSL2772_CHIP_WORKING) {
 636                 /* if forcing a register update - turn off, then on */
 637                 dev_info(&chip->client->dev, "device is already enabled\n");
 638                 return -EINVAL;
 639         }
 640
 641         /* Set the gain based on tsl2772_settings struct */
 642         chip->tsl2772_config[TSL2772_GAIN] =
 643                 (chip->settings.als_gain & 0xFF) |
 644                 ((chip->settings.prox_gain & 0xFF) << 2) |
 645                 (chip->settings.prox_diode << 4) |
 646                 (chip->settings.prox_power << 6);
 647
 648         /* set chip time scaling and saturation */
 649         als_count = 256 - chip->settings.als_time;
 650         als_time_us = als_count * tsl2772_int_time_avail[chip->id][3];
 651         chip->als_saturation = als_count * 768; /* 75% of full scale */
 652         chip->als_gain_time_scale = als_time_us *
 653                 tsl2772_als_gain[chip->settings.als_gain];
 654
 655         /*
 656          * TSL2772 Specific power-on / adc enable sequence
 657          * Power on the device 1st.
 658          */
 659         ret = tsl2772_write_control_reg(chip, TSL2772_CNTL_PWR_ON);
 660         if (ret < 0)
 661                 return ret;
 662
 663         /*
 664          * Use the following shadow copy for our delay before enabling ADC.
 665          * Write all the registers.
 666          */
 667         for (i = 0, dev_reg = chip->tsl2772_config;
 668                         i < TSL2772_MAX_CONFIG_REG; i++) {
 669                 int reg = TSL2772_CMD_REG + i;
 670
 671                 ret = i2c_smbus_write_byte_data(chip->client, reg,
 672                                                 *dev_reg++);
 673                 if (ret < 0) {
 674                         dev_err(&chip->client->dev,
 675                                 "%s: failed to write to register %x: %d\n",
 676                                 __func__, reg, ret);
 677                         return ret;
 678                 }
 679         }
 680
 681         /* Power-on settling time */
 682         usleep_range(3000, 3500);
 683
 684         reg_val = TSL2772_CNTL_PWR_ON | TSL2772_CNTL_ADC_ENBL |
 685                   TSL2772_CNTL_PROX_DET_ENBL;
 686         if (chip->settings.als_interrupt_en)
 687                 reg_val |= TSL2772_CNTL_ALS_INT_ENBL;
 688         if (chip->settings.prox_interrupt_en)
 689                 reg_val |= TSL2772_CNTL_PROX_INT_ENBL;
 690
 691         ret = tsl2772_write_control_reg(chip, reg_val);
 692         if (ret < 0)
 693                 return ret;
 694
 695         ret = i2c_smbus_write_byte(chip->client,
 696                                    TSL2772_CMD_REG | TSL2772_CMD_SPL_FN |
 697                                    TSL2772_CMD_PROXALS_INT_CLR);
 698         if (ret < 0) {
 699                 dev_err(&chip->client->dev,
 700                         "%s: failed to clear interrupt status: %d\n",
 701                         __func__, ret);
 702                 return ret;
 703         }
 704
 705         chip->tsl2772_chip_status = TSL2772_CHIP_WORKING;
 706
 707         return ret;
 708 }
 709
 710 static int tsl2772_chip_off(struct iio_dev *indio_dev)
 711 {
 712         struct tsl2772_chip *chip = iio_priv(indio_dev);
 713
 714         /* turn device off */
 715         chip->tsl2772_chip_status = TSL2772_CHIP_SUSPENDED;
 716         return tsl2772_write_control_reg(chip, 0x00);
 717 }
 718
 719 /**
 720  * tsl2772_invoke_change - power cycle the device to implement the user
 721  *                         parameters
 722  * @indio_dev:  pointer to IIO device
 723  *
 724  * Obtain and lock both ALS and PROX resources, determine and save device state
 725  * (On/Off), cycle device to implement updated parameter, put device back into
 726  * proper state, and unlock resource.
 727  */
 728 static int tsl2772_invoke_change(struct iio_dev *indio_dev)
 729 {
 730         struct tsl2772_chip *chip = iio_priv(indio_dev);
 731         int device_status = chip->tsl2772_chip_status;
 732         int ret;
 733
 734         mutex_lock(&chip->als_mutex);
 735         mutex_lock(&chip->prox_mutex);
 736
 737         if (device_status == TSL2772_CHIP_WORKING) {
 738                 ret = tsl2772_chip_off(indio_dev);
 739                 if (ret < 0)
 740                         goto unlock;
 741         }
 742
 743         ret = tsl2772_chip_on(indio_dev);
 744
 745 unlock:
 746         mutex_unlock(&chip->prox_mutex);
 747         mutex_unlock(&chip->als_mutex);
 748
 749         return ret;
 750 }
 751
 752 static int tsl2772_prox_cal(struct iio_dev *indio_dev)
 753 {
 754         struct tsl2772_chip *chip = iio_priv(indio_dev);
 755         int prox_history[MAX_SAMPLES_CAL + 1];
 756         int i, ret, mean, max, sample_sum;
 757
 758         if (chip->settings.prox_max_samples_cal < 1 ||
 759             chip->settings.prox_max_samples_cal > MAX_SAMPLES_CAL)
 760                 return -EINVAL;
 761
 762         for (i = 0; i < chip->settings.prox_max_samples_cal; i++) {
 763                 usleep_range(15000, 17500);
 764                 ret = tsl2772_get_prox(indio_dev);
 765                 if (ret < 0)
 766                         return ret;
 767
 768                 prox_history[i] = chip->prox_data;
 769         }
 770
 771         sample_sum = 0;
 772         max = INT_MIN;
 773         for (i = 0; i < chip->settings.prox_max_samples_cal; i++) {
 774                 sample_sum += prox_history[i];
 775                 max = max(max, prox_history[i]);
 776         }
 777         mean = sample_sum / chip->settings.prox_max_samples_cal;
 778
 779         chip->settings.prox_thres_high = (max << 1) - mean;
 780
 781         return tsl2772_invoke_change(indio_dev);
 782 }
 783
 784 static int tsl2772_read_avail(struct iio_dev *indio_dev,
 785                               struct iio_chan_spec const *chan,
 786                               const int **vals, int *type, int *length,
 787                               long mask)
 788 {
 789         struct tsl2772_chip *chip = iio_priv(indio_dev);
 790
 791         switch (mask) {
 792         case IIO_CHAN_INFO_CALIBSCALE:
 793                 if (chan->type == IIO_INTENSITY) {
 794                         *length = ARRAY_SIZE(tsl2772_int_calibscale_avail);
 795                         *vals = tsl2772_int_calibscale_avail;
 796                 } else {
 797                         *length = ARRAY_SIZE(tsl2772_prox_calibscale_avail);
 798                         *vals = tsl2772_prox_calibscale_avail;
 799                 }
 800                 *type = IIO_VAL_INT;
 801                 return IIO_AVAIL_LIST;
 802         case IIO_CHAN_INFO_INT_TIME:
 803                 *length = ARRAY_SIZE(tsl2772_int_time_avail[chip->id]);
 804                 *vals = tsl2772_int_time_avail[chip->id];
 805                 *type = IIO_VAL_INT_PLUS_MICRO;
 806                 return IIO_AVAIL_RANGE;
 807         }
 808
 809         return -EINVAL;
 810 }
 811
 812 static ssize_t in_illuminance0_target_input_show(struct device *dev,
 813                                                  struct device_attribute *attr,
 814                                                  char *buf)
 815 {
 816         struct tsl2772_chip *chip = iio_priv(dev_to_iio_dev(dev));
 817
 818         return snprintf(buf, PAGE_SIZE, "%d\n", chip->settings.als_cal_target);
 819 }
 820
 821 static ssize_t in_illuminance0_target_input_store(struct device *dev,
 822                                                   struct device_attribute *attr,
 823                                                   const char *buf, size_t len)
 824 {
 825         struct iio_dev *indio_dev = dev_to_iio_dev(dev);
 826         struct tsl2772_chip *chip = iio_priv(indio_dev);
 827         u16 value;
 828         int ret;
 829
 830         if (kstrtou16(buf, 0, &value))
 831                 return -EINVAL;
 832
 833         chip->settings.als_cal_target = value;
 834         ret = tsl2772_invoke_change(indio_dev);
 835         if (ret < 0)
 836                 return ret;
 837
 838         return len;
 839 }
 840
 841 static ssize_t in_illuminance0_calibrate_store(struct device *dev,
 842                                                struct device_attribute *attr,
 843                                                const char *buf, size_t len)
 844 {
 845         struct iio_dev *indio_dev = dev_to_iio_dev(dev);
 846         bool value;
 847         int ret;
 848
 849         if (kstrtobool(buf, &value) || !value)
 850                 return -EINVAL;
 851
 852         ret = tsl2772_als_calibrate(indio_dev);
 853         if (ret < 0)
 854                 return ret;
 855
 856         ret = tsl2772_invoke_change(indio_dev);
 857         if (ret < 0)
 858                 return ret;
 859
 860         return len;
 861 }
 862
 863 static ssize_t in_illuminance0_lux_table_show(struct device *dev,
 864                                               struct device_attribute *attr,
 865                                               char *buf)
 866 {
 867         struct tsl2772_chip *chip = iio_priv(dev_to_iio_dev(dev));
 868         int i = 0;
 869         int offset = 0;
 870
 871         while (i < TSL2772_MAX_LUX_TABLE_SIZE) {
 872                 offset += snprintf(buf + offset, PAGE_SIZE, "%u,%u,",
 873                         chip->tsl2772_device_lux[i].ch0,
 874                         chip->tsl2772_device_lux[i].ch1);
 875                 if (chip->tsl2772_device_lux[i].ch0 == 0) {
 876                         /*
 877                          * We just printed the first "0" entry.
 878                          * Now get rid of the extra "," and break.
 879                          */
 880                         offset--;
 881                         break;
 882                 }
 883                 i++;
 884         }
 885
 886         offset += snprintf(buf + offset, PAGE_SIZE, "\n");
 887         return offset;
 888 }
 889
 890 static ssize_t in_illuminance0_lux_table_store(struct device *dev,
 891                                                struct device_attribute *attr,
 892                                                const char *buf, size_t len)
 893 {
 894         struct iio_dev *indio_dev = dev_to_iio_dev(dev);
 895         struct tsl2772_chip *chip = iio_priv(indio_dev);
 896         int value[ARRAY_SIZE(chip->tsl2772_device_lux) * 2 + 1];
 897         int n, ret;
 898
 899         get_options(buf, ARRAY_SIZE(value), value);
 900
 901         /*
 902          * We now have an array of ints starting at value[1], and
 903          * enumerated by value[0].
 904          * We expect each group of two ints to be one table entry,
 905          * and the last table entry is all 0.
 906          */
 907         n = value[0];
 908         if ((n % 2) || n < 4 ||
 909             n > ((ARRAY_SIZE(chip->tsl2772_device_lux) - 1) * 2))
 910                 return -EINVAL;
 911
 912         if ((value[(n - 1)] | value[n]) != 0)
 913                 return -EINVAL;
 914
 915         if (chip->tsl2772_chip_status == TSL2772_CHIP_WORKING) {
 916                 ret = tsl2772_chip_off(indio_dev);
 917                 if (ret < 0)
 918                         return ret;
 919         }
 920
 921         /* Zero out the table */
 922         memset(chip->tsl2772_device_lux, 0, sizeof(chip->tsl2772_device_lux));
 923         memcpy(chip->tsl2772_device_lux, &value[1], (value[0] * 4));
 924
 925         ret = tsl2772_invoke_change(indio_dev);
 926         if (ret < 0)
 927                 return ret;
 928
 929         return len;
 930 }
 931
 932 static ssize_t in_proximity0_calibrate_store(struct device *dev,
 933                                              struct device_attribute *attr,
 934                                              const char *buf, size_t len)
 935 {
 936         struct iio_dev *indio_dev = dev_to_iio_dev(dev);
 937         bool value;
 938         int ret;
 939
 940         if (kstrtobool(buf, &value) || !value)
 941                 return -EINVAL;
 942
 943         ret = tsl2772_prox_cal(indio_dev);
 944         if (ret < 0)
 945                 return ret;
 946
 947         ret = tsl2772_invoke_change(indio_dev);
 948         if (ret < 0)
 949                 return ret;
 950
 951         return len;
 952 }
 953
 954 static int tsl2772_read_interrupt_config(struct iio_dev *indio_dev,
 955                                          const struct iio_chan_spec *chan,
 956                                          enum iio_event_type type,
 957                                          enum iio_event_direction dir)
 958 {
 959         struct tsl2772_chip *chip = iio_priv(indio_dev);
 960
 961         if (chan->type == IIO_INTENSITY)
 962                 return chip->settings.als_interrupt_en;
 963         else
 964                 return chip->settings.prox_interrupt_en;
 965 }
 966
 967 static int tsl2772_write_interrupt_config(struct iio_dev *indio_dev,
 968                                           const struct iio_chan_spec *chan,
 969                                           enum iio_event_type type,
 970                                           enum iio_event_direction dir,
 971                                           int val)
 972 {
 973         struct tsl2772_chip *chip = iio_priv(indio_dev);
 974
 975         if (chan->type == IIO_INTENSITY)
 976                 chip->settings.als_interrupt_en = val ? true : false;
 977         else
 978                 chip->settings.prox_interrupt_en = val ? true : false;
 979
 980         return tsl2772_invoke_change(indio_dev);
 981 }
 982
 983 static int tsl2772_write_event_value(struct iio_dev *indio_dev,
 984                                      const struct iio_chan_spec *chan,
 985                                      enum iio_event_type type,
 986                                      enum iio_event_direction dir,
 987                                      enum iio_event_info info,
 988                                      int val, int val2)
 989 {
 990         struct tsl2772_chip *chip = iio_priv(indio_dev);
 991         int ret = -EINVAL, count, persistence;
 992         u8 time;
 993
 994         switch (info) {
 995         case IIO_EV_INFO_VALUE:
 996                 if (chan->type == IIO_INTENSITY) {
 997                         switch (dir) {
 998                         case IIO_EV_DIR_RISING:
 999                                 chip->settings.als_thresh_high = val;
1000                                 ret = 0;
1001                                 break;
1002                         case IIO_EV_DIR_FALLING:
1003                                 chip->settings.als_thresh_low = val;
1004                                 ret = 0;
1005                                 break;
1006                         default:
1007                                 break;
1008                         }
1009                 } else {
1010                         switch (dir) {
1011                         case IIO_EV_DIR_RISING:
1012                                 chip->settings.prox_thres_high = val;
1013                                 ret = 0;
1014                                 break;
1015                         case IIO_EV_DIR_FALLING:
1016                                 chip->settings.prox_thres_low = val;
1017                                 ret = 0;
1018                                 break;
1019                         default:
1020                                 break;
1021                         }
1022                 }
1023                 break;
1024         case IIO_EV_INFO_PERIOD:
1025                 if (chan->type == IIO_INTENSITY)
1026                         time = chip->settings.als_time;
1027                 else
1028                         time = chip->settings.prox_time;
1029
1030                 count = 256 - time;
1031                 persistence = ((val * 1000000) + val2) /
1032                         (count * tsl2772_int_time_avail[chip->id][3]);
1033
1034                 if (chan->type == IIO_INTENSITY) {
1035                         /* ALS filter values are 1, 2, 3, 5, 10, 15, ..., 60 */
1036                         if (persistence > 3)
1037                                 persistence = (persistence / 5) + 3;
1038
1039                         chip->settings.als_persistence = persistence;
1040                 } else {
1041                         chip->settings.prox_persistence = persistence;
1042                 }
1043
1044                 ret = 0;
1045                 break;
1046         default:
1047                 break;
1048         }
1049
1050         if (ret < 0)
1051                 return ret;
1052
1053         return tsl2772_invoke_change(indio_dev);
1054 }
1055
1056 static int tsl2772_read_event_value(struct iio_dev *indio_dev,
1057                                     const struct iio_chan_spec *chan,
1058                                     enum iio_event_type type,
1059                                     enum iio_event_direction dir,
1060                                     enum iio_event_info info,
1061                                     int *val, int *val2)
1062 {
1063         struct tsl2772_chip *chip = iio_priv(indio_dev);
1064         int filter_delay, persistence;
1065         u8 time;
1066
1067         switch (info) {
1068         case IIO_EV_INFO_VALUE:
1069                 if (chan->type == IIO_INTENSITY) {
1070                         switch (dir) {
1071                         case IIO_EV_DIR_RISING:
1072                                 *val = chip->settings.als_thresh_high;
1073                                 return IIO_VAL_INT;
1074                         case IIO_EV_DIR_FALLING:
1075                                 *val = chip->settings.als_thresh_low;
1076                                 return IIO_VAL_INT;
1077                         default:
1078                                 return -EINVAL;
1079                         }
1080                 } else {
1081                         switch (dir) {
1082                         case IIO_EV_DIR_RISING:
1083                                 *val = chip->settings.prox_thres_high;
1084                                 return IIO_VAL_INT;
1085                         case IIO_EV_DIR_FALLING:
1086                                 *val = chip->settings.prox_thres_low;
1087                                 return IIO_VAL_INT;
1088                         default:
1089                                 return -EINVAL;
1090                         }
1091                 }
1092                 break;
1093         case IIO_EV_INFO_PERIOD:
1094                 if (chan->type == IIO_INTENSITY) {
1095                         time = chip->settings.als_time;
1096                         persistence = chip->settings.als_persistence;
1097
1098                         /* ALS filter values are 1, 2, 3, 5, 10, 15, ..., 60 */
1099                         if (persistence > 3)
1100                                 persistence = (persistence - 3) * 5;
1101                 } else {
1102                         time = chip->settings.prox_time;
1103                         persistence = chip->settings.prox_persistence;
1104                 }
1105
1106                 filter_delay = persistence * (256 - time) *
1107                         tsl2772_int_time_avail[chip->id][3];
1108
1109                 *val = filter_delay / 1000000;
1110                 *val2 = filter_delay % 1000000;
1111                 return IIO_VAL_INT_PLUS_MICRO;
1112         default:
1113                 return -EINVAL;
1114         }
1115 }
1116
1117 static int tsl2772_read_raw(struct iio_dev *indio_dev,
1118                             struct iio_chan_spec const *chan,
1119                             int *val,
1120                             int *val2,
1121                             long mask)
1122 {
1123         struct tsl2772_chip *chip = iio_priv(indio_dev);
1124
1125         switch (mask) {
1126         case IIO_CHAN_INFO_PROCESSED:
1127                 switch (chan->type) {
1128                 case IIO_LIGHT:
1129                         tsl2772_get_lux(indio_dev);
1130                         *val = chip->als_cur_info.lux;
1131                         return IIO_VAL_INT;
1132                 default:
1133                         return -EINVAL;
1134                 }
1135         case IIO_CHAN_INFO_RAW:
1136                 switch (chan->type) {
1137                 case IIO_INTENSITY:
1138                         tsl2772_get_lux(indio_dev);
1139                         if (chan->channel == 0)
1140                                 *val = chip->als_cur_info.als_ch0;
1141                         else
1142                                 *val = chip->als_cur_info.als_ch1;
1143                         return IIO_VAL_INT;
1144                 case IIO_PROXIMITY:
1145                         tsl2772_get_prox(indio_dev);
1146                         *val = chip->prox_data;
1147                         return IIO_VAL_INT;
1148                 default:
1149                         return -EINVAL;
1150                 }
1151                 break;
1152         case IIO_CHAN_INFO_CALIBSCALE:
1153                 if (chan->type == IIO_LIGHT)
1154                         *val = tsl2772_als_gain[chip->settings.als_gain];
1155                 else
1156                         *val = tsl2772_prox_gain[chip->settings.prox_gain];
1157                 return IIO_VAL_INT;
1158         case IIO_CHAN_INFO_CALIBBIAS:
1159                 *val = chip->settings.als_gain_trim;
1160                 return IIO_VAL_INT;
1161         case IIO_CHAN_INFO_INT_TIME:
1162                 *val = 0;
1163                 *val2 = (256 - chip->settings.als_time) *
1164                         tsl2772_int_time_avail[chip->id][3];
1165                 return IIO_VAL_INT_PLUS_MICRO;
1166         default:
1167                 return -EINVAL;
1168         }
1169 }
1170
1171 static int tsl2772_write_raw(struct iio_dev *indio_dev,
1172                              struct iio_chan_spec const *chan,
1173                              int val,
1174                              int val2,
1175                              long mask)
1176 {
1177         struct tsl2772_chip *chip = iio_priv(indio_dev);
1178
1179         switch (mask) {
1180         case IIO_CHAN_INFO_CALIBSCALE:
1181                 if (chan->type == IIO_INTENSITY) {
1182                         switch (val) {
1183                         case 1:
1184                                 chip->settings.als_gain = 0;
1185                                 break;
1186                         case 8:
1187                                 chip->settings.als_gain = 1;
1188                                 break;
1189                         case 16:
1190                                 chip->settings.als_gain = 2;
1191                                 break;
1192                         case 120:
1193                                 chip->settings.als_gain = 3;
1194                                 break;
1195                         default:
1196                                 return -EINVAL;
1197                         }
1198                 } else {
1199                         switch (val) {
1200                         case 1:
1201                                 chip->settings.prox_gain = 0;
1202                                 break;
1203                         case 2:
1204                                 chip->settings.prox_gain = 1;
1205                                 break;
1206                         case 4:
1207                                 chip->settings.prox_gain = 2;
1208                                 break;
1209                         case 8:
1210                                 chip->settings.prox_gain = 3;
1211                                 break;
1212                         default:
1213                                 return -EINVAL;
1214                         }
1215                 }
1216                 break;
1217         case IIO_CHAN_INFO_CALIBBIAS:
1218                 if (val < TSL2772_ALS_GAIN_TRIM_MIN ||
1219                     val > TSL2772_ALS_GAIN_TRIM_MAX)
1220                         return -EINVAL;
1221
1222                 chip->settings.als_gain_trim = val;
1223                 break;
1224         case IIO_CHAN_INFO_INT_TIME:
1225                 if (val != 0 || val2 < tsl2772_int_time_avail[chip->id][1] ||
1226                     val2 > tsl2772_int_time_avail[chip->id][5])
1227                         return -EINVAL;
1228
1229                 chip->settings.als_time = 256 -
1230                         (val2 / tsl2772_int_time_avail[chip->id][3]);
1231                 break;
1232         default:
1233                 return -EINVAL;
1234         }
1235
1236         return tsl2772_invoke_change(indio_dev);
1237 }
1238
1239 static DEVICE_ATTR_RW(in_illuminance0_target_input);
1240
1241 static DEVICE_ATTR_WO(in_illuminance0_calibrate);
1242
1243 static DEVICE_ATTR_WO(in_proximity0_calibrate);
1244
1245 static DEVICE_ATTR_RW(in_illuminance0_lux_table);
1246
1247 /* Use the default register values to identify the Taos device */
1248 static int tsl2772_device_id_verif(int id, int target)
1249 {
1250         switch (target) {
1251         case tsl2571:
1252         case tsl2671:
1253         case tsl2771:
1254                 return (id & 0xf0) == TRITON_ID;
1255         case tmd2671:
1256         case tmd2771:
1257                 return (id & 0xf0) == HALIBUT_ID;
1258         case tsl2572:
1259         case tsl2672:
1260         case tmd2672:
1261         case tsl2772:
1262         case tmd2772:
1263                 return (id & 0xf0) == SWORDFISH_ID;
1264         }
1265
1266         return -EINVAL;
1267 }
1268
1269 static irqreturn_t tsl2772_event_handler(int irq, void *private)
1270 {
1271         struct iio_dev *indio_dev = private;
1272         struct tsl2772_chip *chip = iio_priv(indio_dev);
1273         s64 timestamp = iio_get_time_ns(indio_dev);
1274         int ret;
1275
1276         ret = tsl2772_read_status(chip);
1277         if (ret < 0)
1278                 return IRQ_HANDLED;
1279
1280         /* What type of interrupt do we need to process */
1281         if (ret & TSL2772_STA_PRX_INTR) {
1282                 iio_push_event(indio_dev,
1283                                IIO_UNMOD_EVENT_CODE(IIO_PROXIMITY,
1284                                                     0,
1285                                                     IIO_EV_TYPE_THRESH,
1286                                                     IIO_EV_DIR_EITHER),
1287                                timestamp);
1288         }
1289
1290         if (ret & TSL2772_STA_ALS_INTR) {
1291                 iio_push_event(indio_dev,
1292                                IIO_UNMOD_EVENT_CODE(IIO_LIGHT,
1293                                                     0,
1294                                                     IIO_EV_TYPE_THRESH,
1295                                                     IIO_EV_DIR_EITHER),
1296                                timestamp);
1297         }
1298
1299         ret = i2c_smbus_write_byte(chip->client,
1300                                    TSL2772_CMD_REG | TSL2772_CMD_SPL_FN |
1301                                    TSL2772_CMD_PROXALS_INT_CLR);
1302         if (ret < 0)
1303                 dev_err(&chip->client->dev,
1304                         "%s: failed to clear interrupt status: %d\n",
1305                         __func__, ret);
1306
1307         return IRQ_HANDLED;
1308 }
1309
1310 static struct attribute *tsl2772_ALS_device_attrs[] = {
1311         &dev_attr_in_illuminance0_target_input.attr,
1312         &dev_attr_in_illuminance0_calibrate.attr,
1313         &dev_attr_in_illuminance0_lux_table.attr,
1314         NULL
1315 };
1316
1317 static struct attribute *tsl2772_PRX_device_attrs[] = {
1318         &dev_attr_in_proximity0_calibrate.attr,
1319         NULL
1320 };
1321
1322 static struct attribute *tsl2772_ALSPRX_device_attrs[] = {
1323         &dev_attr_in_illuminance0_target_input.attr,
1324         &dev_attr_in_illuminance0_calibrate.attr,
1325         &dev_attr_in_illuminance0_lux_table.attr,
1326         NULL
1327 };
1328
1329 static struct attribute *tsl2772_PRX2_device_attrs[] = {
1330         &dev_attr_in_proximity0_calibrate.attr,
1331         NULL
1332 };
1333
1334 static struct attribute *tsl2772_ALSPRX2_device_attrs[] = {
1335         &dev_attr_in_illuminance0_target_input.attr,
1336         &dev_attr_in_illuminance0_calibrate.attr,
1337         &dev_attr_in_illuminance0_lux_table.attr,
1338         &dev_attr_in_proximity0_calibrate.attr,
1339         NULL
1340 };
1341
1342 static const struct attribute_group tsl2772_device_attr_group_tbl[] = {
1343         [ALS] = {
1344                 .attrs = tsl2772_ALS_device_attrs,
1345         },
1346         [PRX] = {
1347                 .attrs = tsl2772_PRX_device_attrs,
1348         },
1349         [ALSPRX] = {
1350                 .attrs = tsl2772_ALSPRX_device_attrs,
1351         },
1352         [PRX2] = {
1353                 .attrs = tsl2772_PRX2_device_attrs,
1354         },
1355         [ALSPRX2] = {
1356                 .attrs = tsl2772_ALSPRX2_device_attrs,
1357         },
1358 };
1359
1360 #define TSL2772_DEVICE_INFO(type)[type] = \
1361         { \
1362                 .attrs = &tsl2772_device_attr_group_tbl[type], \
1363                 .read_raw = &tsl2772_read_raw, \
1364                 .read_avail = &tsl2772_read_avail, \
1365                 .write_raw = &tsl2772_write_raw, \
1366                 .read_event_value = &tsl2772_read_event_value, \
1367                 .write_event_value = &tsl2772_write_event_value, \
1368                 .read_event_config = &tsl2772_read_interrupt_config, \
1369                 .write_event_config = &tsl2772_write_interrupt_config, \
1370         }
1371
1372 static const struct iio_info tsl2772_device_info[] = {
1373         TSL2772_DEVICE_INFO(ALS),
1374         TSL2772_DEVICE_INFO(PRX),
1375         TSL2772_DEVICE_INFO(ALSPRX),
1376         TSL2772_DEVICE_INFO(PRX2),
1377         TSL2772_DEVICE_INFO(ALSPRX2),
1378 };
1379
1380 static const struct iio_event_spec tsl2772_events[] = {
1381         {
1382                 .type = IIO_EV_TYPE_THRESH,
1383                 .dir = IIO_EV_DIR_RISING,
1384                 .mask_separate = BIT(IIO_EV_INFO_VALUE),
1385         }, {
1386                 .type = IIO_EV_TYPE_THRESH,
1387                 .dir = IIO_EV_DIR_FALLING,
1388                 .mask_separate = BIT(IIO_EV_INFO_VALUE),
1389         }, {
1390                 .type = IIO_EV_TYPE_THRESH,
1391                 .dir = IIO_EV_DIR_EITHER,
1392                 .mask_separate = BIT(IIO_EV_INFO_PERIOD) |
1393                         BIT(IIO_EV_INFO_ENABLE),
1394         },
1395 };
1396
1397 static const struct tsl2772_chip_info tsl2772_chip_info_tbl[] = {
1398         [ALS] = {
1399                 .channel_with_events = {
1400                         {
1401                         .type = IIO_LIGHT,
1402                         .indexed = 1,
1403                         .channel = 0,
1404                         .info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED),
1405                         }, {
1406                         .type = IIO_INTENSITY,
1407                         .indexed = 1,
1408                         .channel = 0,
1409                         .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
1410                                 BIT(IIO_CHAN_INFO_INT_TIME) |
1411                                 BIT(IIO_CHAN_INFO_CALIBSCALE) |
1412                                 BIT(IIO_CHAN_INFO_CALIBBIAS),
1413                         .info_mask_separate_available =
1414                                 BIT(IIO_CHAN_INFO_INT_TIME) |
1415                                 BIT(IIO_CHAN_INFO_CALIBSCALE),
1416                         .event_spec = tsl2772_events,
1417                         .num_event_specs = ARRAY_SIZE(tsl2772_events),
1418                         }, {
1419                         .type = IIO_INTENSITY,
1420                         .indexed = 1,
1421                         .channel = 1,
1422                         },
1423                 },
1424                 .channel_without_events = {
1425                         {
1426                         .type = IIO_LIGHT,
1427                         .indexed = 1,
1428                         .channel = 0,
1429                         .info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED),
1430                         }, {
1431                         .type = IIO_INTENSITY,
1432                         .indexed = 1,
1433                         .channel = 0,
1434                         .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
1435                                 BIT(IIO_CHAN_INFO_INT_TIME) |
1436                                 BIT(IIO_CHAN_INFO_CALIBSCALE) |
1437                                 BIT(IIO_CHAN_INFO_CALIBBIAS),
1438                         .info_mask_separate_available =
1439                                 BIT(IIO_CHAN_INFO_INT_TIME) |
1440                                 BIT(IIO_CHAN_INFO_CALIBSCALE),
1441                         }, {
1442                         .type = IIO_INTENSITY,
1443                         .indexed = 1,
1444                         .channel = 1,
1445                         },
1446                 },
1447                 .chan_table_elements = 3,
1448                 .info = &tsl2772_device_info[ALS],
1449         },
1450         [PRX] = {
1451                 .channel_with_events = {
1452                         {
1453                         .type = IIO_PROXIMITY,
1454                         .indexed = 1,
1455                         .channel = 0,
1456                         .info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
1457                         .event_spec = tsl2772_events,
1458                         .num_event_specs = ARRAY_SIZE(tsl2772_events),
1459                         },
1460                 },
1461                 .channel_without_events = {
1462                         {
1463                         .type = IIO_PROXIMITY,
1464                         .indexed = 1,
1465                         .channel = 0,
1466                         .info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
1467                         },
1468                 },
1469                 .chan_table_elements = 1,
1470                 .info = &tsl2772_device_info[PRX],
1471         },
1472         [ALSPRX] = {
1473                 .channel_with_events = {
1474                         {
1475                         .type = IIO_LIGHT,
1476                         .indexed = 1,
1477                         .channel = 0,
1478                         .info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED),
1479                         }, {
1480                         .type = IIO_INTENSITY,
1481                         .indexed = 1,
1482                         .channel = 0,
1483                         .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
1484                                 BIT(IIO_CHAN_INFO_INT_TIME) |
1485                                 BIT(IIO_CHAN_INFO_CALIBSCALE) |
1486                                 BIT(IIO_CHAN_INFO_CALIBBIAS),
1487                         .info_mask_separate_available =
1488                                 BIT(IIO_CHAN_INFO_INT_TIME) |
1489                                 BIT(IIO_CHAN_INFO_CALIBSCALE),
1490                         .event_spec = tsl2772_events,
1491                         .num_event_specs = ARRAY_SIZE(tsl2772_events),
1492                         }, {
1493                         .type = IIO_INTENSITY,
1494                         .indexed = 1,
1495                         .channel = 1,
1496                         .info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
1497                         }, {
1498                         .type = IIO_PROXIMITY,
1499                         .indexed = 1,
1500                         .channel = 0,
1501                         .info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
1502                         .event_spec = tsl2772_events,
1503                         .num_event_specs = ARRAY_SIZE(tsl2772_events),
1504                         },
1505                 },
1506                 .channel_without_events = {
1507                         {
1508                         .type = IIO_LIGHT,
1509                         .indexed = 1,
1510                         .channel = 0,
1511                         .info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED),
1512                         }, {
1513                         .type = IIO_INTENSITY,
1514                         .indexed = 1,
1515                         .channel = 0,
1516                         .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
1517                                 BIT(IIO_CHAN_INFO_INT_TIME) |
1518                                 BIT(IIO_CHAN_INFO_CALIBSCALE) |
1519                                 BIT(IIO_CHAN_INFO_CALIBBIAS),
1520                         .info_mask_separate_available =
1521                                 BIT(IIO_CHAN_INFO_INT_TIME) |
1522                                 BIT(IIO_CHAN_INFO_CALIBSCALE),
1523                         }, {
1524                         .type = IIO_INTENSITY,
1525                         .indexed = 1,
1526                         .channel = 1,
1527                         .info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
1528                         }, {
1529                         .type = IIO_PROXIMITY,
1530                         .indexed = 1,
1531                         .channel = 0,
1532                         .info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
1533                         },
1534                 },
1535                 .chan_table_elements = 4,
1536                 .info = &tsl2772_device_info[ALSPRX],
1537         },
1538         [PRX2] = {
1539                 .channel_with_events = {
1540                         {
1541                         .type = IIO_PROXIMITY,
1542                         .indexed = 1,
1543                         .channel = 0,
1544                         .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
1545                                 BIT(IIO_CHAN_INFO_CALIBSCALE),
1546                         .info_mask_separate_available =
1547                                 BIT(IIO_CHAN_INFO_CALIBSCALE),
1548                         .event_spec = tsl2772_events,
1549                         .num_event_specs = ARRAY_SIZE(tsl2772_events),
1550                         },
1551                 },
1552                 .channel_without_events = {
1553                         {
1554                         .type = IIO_PROXIMITY,
1555                         .indexed = 1,
1556                         .channel = 0,
1557                         .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
1558                                 BIT(IIO_CHAN_INFO_CALIBSCALE),
1559                         .info_mask_separate_available =
1560                                 BIT(IIO_CHAN_INFO_CALIBSCALE),
1561                         },
1562                 },
1563                 .chan_table_elements = 1,
1564                 .info = &tsl2772_device_info[PRX2],
1565         },
1566         [ALSPRX2] = {
1567                 .channel_with_events = {
1568                         {
1569                         .type = IIO_LIGHT,
1570                         .indexed = 1,
1571                         .channel = 0,
1572                         .info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED),
1573                         }, {
1574                         .type = IIO_INTENSITY,
1575                         .indexed = 1,
1576                         .channel = 0,
1577                         .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
1578                                 BIT(IIO_CHAN_INFO_INT_TIME) |
1579                                 BIT(IIO_CHAN_INFO_CALIBSCALE) |
1580                                 BIT(IIO_CHAN_INFO_CALIBBIAS),
1581                         .info_mask_separate_available =
1582                                 BIT(IIO_CHAN_INFO_INT_TIME) |
1583                                 BIT(IIO_CHAN_INFO_CALIBSCALE),
1584                         .event_spec = tsl2772_events,
1585                         .num_event_specs = ARRAY_SIZE(tsl2772_events),
1586                         }, {
1587                         .type = IIO_INTENSITY,
1588                         .indexed = 1,
1589                         .channel = 1,
1590                         .info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
1591                         }, {
1592                         .type = IIO_PROXIMITY,
1593                         .indexed = 1,
1594                         .channel = 0,
1595                         .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
1596                                 BIT(IIO_CHAN_INFO_CALIBSCALE),
1597                         .info_mask_separate_available =
1598                                 BIT(IIO_CHAN_INFO_CALIBSCALE),
1599                         .event_spec = tsl2772_events,
1600                         .num_event_specs = ARRAY_SIZE(tsl2772_events),
1601                         },
1602                 },
1603                 .channel_without_events = {
1604                         {
1605                         .type = IIO_LIGHT,
1606                         .indexed = 1,
1607                         .channel = 0,
1608                         .info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED),
1609                         }, {
1610                         .type = IIO_INTENSITY,
1611                         .indexed = 1,
1612                         .channel = 0,
1613                         .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
1614                                 BIT(IIO_CHAN_INFO_INT_TIME) |
1615                                 BIT(IIO_CHAN_INFO_CALIBSCALE) |
1616                                 BIT(IIO_CHAN_INFO_CALIBBIAS),
1617                         .info_mask_separate_available =
1618                                 BIT(IIO_CHAN_INFO_INT_TIME) |
1619                                 BIT(IIO_CHAN_INFO_CALIBSCALE),
1620                         }, {
1621                         .type = IIO_INTENSITY,
1622                         .indexed = 1,
1623                         .channel = 1,
1624                         .info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
1625                         }, {
1626                         .type = IIO_PROXIMITY,
1627                         .indexed = 1,
1628                         .channel = 0,
1629                         .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
1630                                 BIT(IIO_CHAN_INFO_CALIBSCALE),
1631                         .info_mask_separate_available =
1632                                 BIT(IIO_CHAN_INFO_CALIBSCALE),
1633                         },
1634                 },
1635                 .chan_table_elements = 4,
1636                 .info = &tsl2772_device_info[ALSPRX2],
1637         },
1638 };
1639
1640 static int tsl2772_probe(struct i2c_client *clientp,
1641                          const struct i2c_device_id *id)
1642 {
1643         struct iio_dev *indio_dev;
1644         struct tsl2772_chip *chip;
1645         int ret;
1646
1647         indio_dev = devm_iio_device_alloc(&clientp->dev, sizeof(*chip));
1648         if (!indio_dev)
1649                 return -ENOMEM;
1650
1651         chip = iio_priv(indio_dev);
1652         chip->client = clientp;
1653         i2c_set_clientdata(clientp, indio_dev);
1654
1655         ret = i2c_smbus_read_byte_data(chip->client,
1656                                        TSL2772_CMD_REG | TSL2772_CHIPID);
1657         if (ret < 0)
1658                 return ret;
1659
1660         if (tsl2772_device_id_verif(ret, id->driver_data) <= 0) {
1661                 dev_info(&chip->client->dev,
1662                          "%s: i2c device found does not match expected id\n",
1663                                 __func__);
1664                 return -EINVAL;
1665         }
1666
1667         ret = i2c_smbus_write_byte(clientp, TSL2772_CMD_REG | TSL2772_CNTRL);
1668         if (ret < 0) {
1669                 dev_err(&clientp->dev,
1670                         "%s: Failed to write to CMD register: %d\n",
1671                         __func__, ret);
1672                 return ret;
1673         }
1674
1675         mutex_init(&chip->als_mutex);
1676         mutex_init(&chip->prox_mutex);
1677
1678         chip->tsl2772_chip_status = TSL2772_CHIP_UNKNOWN;
1679         chip->pdata = dev_get_platdata(&clientp->dev);
1680         chip->id = id->driver_data;
1681         chip->chip_info =
1682                 &tsl2772_chip_info_tbl[device_channel_config[id->driver_data]];
1683
1684         indio_dev->info = chip->chip_info->info;
1685         indio_dev->dev.parent = &clientp->dev;
1686         indio_dev->modes = INDIO_DIRECT_MODE;
1687         indio_dev->name = chip->client->name;
1688         indio_dev->num_channels = chip->chip_info->chan_table_elements;
1689
1690         if (clientp->irq) {
1691                 indio_dev->channels = chip->chip_info->channel_with_events;
1692
1693                 ret = devm_request_threaded_irq(&clientp->dev, clientp->irq,
1694                                                 NULL,
1695                                                 &tsl2772_event_handler,
1696                                                 IRQF_TRIGGER_FALLING |
1697                                                 IRQF_ONESHOT,
1698                                                 "TSL2772_event",
1699                                                 indio_dev);
1700                 if (ret) {
1701                         dev_err(&clientp->dev,
1702                                 "%s: irq request failed\n", __func__);
1703                         return ret;
1704                 }
1705         } else {
1706                 indio_dev->channels = chip->chip_info->channel_without_events;
1707         }
1708
1709         tsl2772_defaults(chip);
1710         ret = tsl2772_chip_on(indio_dev);
1711         if (ret < 0)
1712                 return ret;
1713
1714         ret = iio_device_register(indio_dev);
1715         if (ret) {
1716                 tsl2772_chip_off(indio_dev);
1717                 dev_err(&clientp->dev,
1718                         "%s: iio registration failed\n", __func__);
1719                 return ret;
1720         }
1721
1722         return 0;
1723 }
1724
1725 static int tsl2772_suspend(struct device *dev)
1726 {
1727         struct iio_dev *indio_dev = dev_get_drvdata(dev);
1728
1729         return tsl2772_chip_off(indio_dev);
1730 }
1731
1732 static int tsl2772_resume(struct device *dev)
1733 {
1734         struct iio_dev *indio_dev = dev_get_drvdata(dev);
1735
1736         return tsl2772_chip_on(indio_dev);
1737 }
1738
1739 static int tsl2772_remove(struct i2c_client *client)
1740 {
1741         struct iio_dev *indio_dev = i2c_get_clientdata(client);
1742
1743         tsl2772_chip_off(indio_dev);
1744
1745         iio_device_unregister(indio_dev);
1746
1747         return 0;
1748 }
1749
1750 static const struct i2c_device_id tsl2772_idtable[] = {
1751         { "tsl2571", tsl2571 },
1752         { "tsl2671", tsl2671 },
1753         { "tmd2671", tmd2671 },
1754         { "tsl2771", tsl2771 },
1755         { "tmd2771", tmd2771 },
1756         { "tsl2572", tsl2572 },
1757         { "tsl2672", tsl2672 },
1758         { "tmd2672", tmd2672 },
1759         { "tsl2772", tsl2772 },
1760         { "tmd2772", tmd2772 },
1761         {}
1762 };
1763
1764 MODULE_DEVICE_TABLE(i2c, tsl2772_idtable);
1765
1766 static const struct of_device_id tsl2772_of_match[] = {
1767         { .compatible = "amstaos,tsl2571" },
1768         { .compatible = "amstaos,tsl2671" },
1769         { .compatible = "amstaos,tmd2671" },
1770         { .compatible = "amstaos,tsl2771" },
1771         { .compatible = "amstaos,tmd2771" },
1772         { .compatible = "amstaos,tsl2572" },
1773         { .compatible = "amstaos,tsl2672" },
1774         { .compatible = "amstaos,tmd2672" },
1775         { .compatible = "amstaos,tsl2772" },
1776         { .compatible = "amstaos,tmd2772" },
1777         {}
1778 };
1779 MODULE_DEVICE_TABLE(of, tsl2772_of_match);
1780
1781 static const struct dev_pm_ops tsl2772_pm_ops = {
1782         .suspend = tsl2772_suspend,
1783         .resume  = tsl2772_resume,
1784 };
1785
1786 static struct i2c_driver tsl2772_driver = {
1787         .driver = {
1788                 .name = "tsl2772",
1789                 .of_match_table = tsl2772_of_match,
1790                 .pm = &tsl2772_pm_ops,
1791         },
1792         .id_table = tsl2772_idtable,
1793         .probe = tsl2772_probe,
1794         .remove = tsl2772_remove,
1795 };
1796
1797 module_i2c_driver(tsl2772_driver);
1798
1799 MODULE_AUTHOR("J. August Brenner <Jon.Brenner@ams.com>");
1800 MODULE_AUTHOR("Brian Masney <masneyb@onstation.org>");
1801 MODULE_DESCRIPTION("TAOS tsl2772 ambient and proximity light sensor driver");
1802 MODULE_LICENSE("GPL");