drivers/iio/light/tsl2583.c

   1 /*
   2  * Device driver for monitoring ambient light intensity (lux)
   3  * within the TAOS tsl258x family of devices (tsl2580, tsl2581, tsl2583).
   4  *
   5  * Copyright (c) 2011, TAOS Corporation.
   6  * Copyright (c) 2016 Brian Masney <masneyb@onstation.org>
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License as published by
  10  * the Free Software Foundation; either version 2 of the License, or
  11  * (at your option) any later version.
  12  *
  13  * This program is distributed in the hope that it will be useful, but WITHOUT
  14  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  15  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  16  * more details.
  17  */
  18
  19 #include <linux/kernel.h>
  20 #include <linux/i2c.h>
  21 #include <linux/errno.h>
  22 #include <linux/delay.h>
  23 #include <linux/string.h>
  24 #include <linux/mutex.h>
  25 #include <linux/unistd.h>
  26 #include <linux/slab.h>
  27 #include <linux/module.h>
  28 #include <linux/iio/iio.h>
  29 #include <linux/iio/sysfs.h>
  30
  31 /* Device Registers and Masks */
  32 #define TSL2583_CNTRL                   0x00
  33 #define TSL2583_ALS_TIME                0X01
  34 #define TSL2583_INTERRUPT               0x02
  35 #define TSL2583_GAIN                    0x07
  36 #define TSL2583_REVID                   0x11
  37 #define TSL2583_CHIPID                  0x12
  38 #define TSL2583_ALS_CHAN0LO             0x14
  39 #define TSL2583_ALS_CHAN0HI             0x15
  40 #define TSL2583_ALS_CHAN1LO             0x16
  41 #define TSL2583_ALS_CHAN1HI             0x17
  42 #define TSL2583_TMR_LO                  0x18
  43 #define TSL2583_TMR_HI                  0x19
  44
  45 /* tsl2583 cmd reg masks */
  46 #define TSL2583_CMD_REG                 0x80
  47 #define TSL2583_CMD_SPL_FN              0x60
  48 #define TSL2583_CMD_ALS_INT_CLR         0x01
  49
  50 /* tsl2583 cntrl reg masks */
  51 #define TSL2583_CNTL_ADC_ENBL           0x02
  52 #define TSL2583_CNTL_PWR_OFF            0x00
  53 #define TSL2583_CNTL_PWR_ON             0x01
  54
  55 /* tsl2583 status reg masks */
  56 #define TSL2583_STA_ADC_VALID           0x01
  57 #define TSL2583_STA_ADC_INTR            0x10
  58
  59 /* Lux calculation constants */
  60 #define TSL2583_LUX_CALC_OVER_FLOW      65535
  61
  62 #define TSL2583_INTERRUPT_DISABLED      0x00
  63
  64 #define TSL2583_CHIP_ID                 0x90
  65 #define TSL2583_CHIP_ID_MASK            0xf0
  66
  67 /* Per-device data */
  68 struct tsl2583_als_info {
  69         u16 als_ch0;
  70         u16 als_ch1;
  71         u16 lux;
  72 };
  73
  74 struct tsl2583_lux {
  75         unsigned int ratio;
  76         unsigned int ch0;
  77         unsigned int ch1;
  78 };
  79
  80 static const struct tsl2583_lux tsl2583_default_lux[] = {
  81         {  9830,  8520, 15729 },
  82         { 12452, 10807, 23344 },
  83         { 14746,  6383, 11705 },
  84         { 17695,  4063,  6554 },
  85         {     0,     0,     0 }  /* Termination segment */
  86 };
  87
  88 #define TSL2583_MAX_LUX_TABLE_ENTRIES 11
  89
  90 struct tsl2583_settings {
  91         int als_time;
  92         int als_gain;
  93         int als_gain_trim;
  94         int als_cal_target;
  95
  96         /*
  97          * This structure is intentionally large to accommodate updates via
  98          * sysfs. Sized to 11 = max 10 segments + 1 termination segment.
  99          * Assumption is that one and only one type of glass used.
 100          */
 101         struct tsl2583_lux als_device_lux[TSL2583_MAX_LUX_TABLE_ENTRIES];
 102 };
 103
 104 struct tsl2583_chip {
 105         struct mutex als_mutex;
 106         struct i2c_client *client;
 107         struct tsl2583_als_info als_cur_info;
 108         struct tsl2583_settings als_settings;
 109         int als_time_scale;
 110         int als_saturation;
 111         bool suspended;
 112 };
 113
 114 struct gainadj {
 115         s16 ch0;
 116         s16 ch1;
 117         s16 mean;
 118 };
 119
 120 /* Index = (0 - 3) Used to validate the gain selection index */
 121 static const struct gainadj gainadj[] = {
 122         { 1, 1, 1 },
 123         { 8, 8, 8 },
 124         { 16, 16, 16 },
 125         { 107, 115, 111 }
 126 };
 127
 128 /*
 129  * Provides initial operational parameter defaults.
 130  * These defaults may be changed through the device's sysfs files.
 131  */
 132 static void tsl2583_defaults(struct tsl2583_chip *chip)
 133 {
 134         /*
 135          * The integration time must be a multiple of 50ms and within the
 136          * range [50, 600] ms.
 137          */
 138         chip->als_settings.als_time = 100;
 139
 140         /*
 141          * This is an index into the gainadj table. Assume clear glass as the
 142          * default.
 143          */
 144         chip->als_settings.als_gain = 0;
 145
 146         /* Default gain trim to account for aperture effects */
 147         chip->als_settings.als_gain_trim = 1000;
 148
 149         /* Known external ALS reading used for calibration */
 150         chip->als_settings.als_cal_target = 130;
 151
 152         /* Default lux table. */
 153         memcpy(chip->als_settings.als_device_lux, tsl2583_default_lux,
 154                sizeof(tsl2583_default_lux));
 155 }
 156
 157 /*
 158  * Reads and calculates current lux value.
 159  * The raw ch0 and ch1 values of the ambient light sensed in the last
 160  * integration cycle are read from the device.
 161  * Time scale factor array values are adjusted based on the integration time.
 162  * The raw values are multiplied by a scale factor, and device gain is obtained
 163  * using gain index. Limit checks are done next, then the ratio of a multiple
 164  * of ch1 value, to the ch0 value, is calculated. The array als_device_lux[]
 165  * declared above is then scanned to find the first ratio value that is just
 166  * above the ratio we just calculated. The ch0 and ch1 multiplier constants in
 167  * the array are then used along with the time scale factor array values, to
 168  * calculate the lux.
 169  */
 170 static int tsl2583_get_lux(struct iio_dev *indio_dev)
 171 {
 172         u16 ch0, ch1; /* separated ch0/ch1 data from device */
 173         u32 lux; /* raw lux calculated from device data */
 174         u64 lux64;
 175         u32 ratio;
 176         u8 buf[5];
 177         struct tsl2583_lux *p;
 178         struct tsl2583_chip *chip = iio_priv(indio_dev);
 179         int i, ret;
 180
 181         ret = i2c_smbus_read_byte_data(chip->client, TSL2583_CMD_REG);
 182         if (ret < 0) {
 183                 dev_err(&chip->client->dev, "%s: failed to read CMD_REG register\n",
 184                         __func__);
 185                 goto done;
 186         }
 187
 188         /* is data new & valid */
 189         if (!(ret & TSL2583_STA_ADC_INTR)) {
 190                 dev_err(&chip->client->dev, "%s: data not valid; returning last value\n",
 191                         __func__);
 192                 ret = chip->als_cur_info.lux; /* return LAST VALUE */
 193                 goto done;
 194         }
 195
 196         for (i = 0; i < 4; i++) {
 197                 int reg = TSL2583_CMD_REG | (TSL2583_ALS_CHAN0LO + i);
 198
 199                 ret = i2c_smbus_read_byte_data(chip->client, reg);
 200                 if (ret < 0) {
 201                         dev_err(&chip->client->dev, "%s: failed to read register %x\n",
 202                                 __func__, reg);
 203                         goto done;
 204                 }
 205                 buf[i] = ret;
 206         }
 207
 208         /*
 209          * Clear the pending interrupt status bit on the chip to allow the next
 210          * integration cycle to start. This has to be done even though this
 211          * driver currently does not support interrupts.
 212          */
 213         ret = i2c_smbus_write_byte(chip->client,
 214                                    (TSL2583_CMD_REG | TSL2583_CMD_SPL_FN |
 215                                     TSL2583_CMD_ALS_INT_CLR));
 216         if (ret < 0) {
 217                 dev_err(&chip->client->dev, "%s: failed to clear the interrupt bit\n",
 218                         __func__);
 219                 goto done; /* have no data, so return failure */
 220         }
 221
 222         /* extract ALS/lux data */
 223         ch0 = le16_to_cpup((const __le16 *)&buf[0]);
 224         ch1 = le16_to_cpup((const __le16 *)&buf[2]);
 225
 226         chip->als_cur_info.als_ch0 = ch0;
 227         chip->als_cur_info.als_ch1 = ch1;
 228
 229         if ((ch0 >= chip->als_saturation) || (ch1 >= chip->als_saturation))
 230                 goto return_max;
 231
 232         if (!ch0) {
 233                 /*
 234                  * The sensor appears to be in total darkness so set the
 235                  * calculated lux to 0 and return early to avoid a division by
 236                  * zero below when calculating the ratio.
 237                  */
 238                 ret = 0;
 239                 chip->als_cur_info.lux = 0;
 240                 goto done;
 241         }
 242
 243         /* calculate ratio */
 244         ratio = (ch1 << 15) / ch0;
 245
 246         /* convert to unscaled lux using the pointer to the table */
 247         for (p = (struct tsl2583_lux *)chip->als_settings.als_device_lux;
 248              p->ratio != 0 && p->ratio < ratio; p++)
 249                 ;
 250
 251         if (p->ratio == 0) {
 252                 lux = 0;
 253         } else {
 254                 u32 ch0lux, ch1lux;
 255
 256                 ch0lux = ((ch0 * p->ch0) +
 257                           (gainadj[chip->als_settings.als_gain].ch0 >> 1))
 258                          / gainadj[chip->als_settings.als_gain].ch0;
 259                 ch1lux = ((ch1 * p->ch1) +
 260                           (gainadj[chip->als_settings.als_gain].ch1 >> 1))
 261                          / gainadj[chip->als_settings.als_gain].ch1;
 262
 263                 /* note: lux is 31 bit max at this point */
 264                 if (ch1lux > ch0lux) {
 265                         dev_dbg(&chip->client->dev, "%s: No Data - Returning 0\n",
 266                                 __func__);
 267                         ret = 0;
 268                         chip->als_cur_info.lux = 0;
 269                         goto done;
 270                 }
 271
 272                 lux = ch0lux - ch1lux;
 273         }
 274
 275         /* adjust for active time scale */
 276         if (chip->als_time_scale == 0)
 277                 lux = 0;
 278         else
 279                 lux = (lux + (chip->als_time_scale >> 1)) /
 280                         chip->als_time_scale;
 281
 282         /*
 283          * Adjust for active gain scale.
 284          * The tsl2583_default_lux tables above have a factor of 8192 built in,
 285          * so we need to shift right.
 286          * User-specified gain provides a multiplier.
 287          * Apply user-specified gain before shifting right to retain precision.
 288          * Use 64 bits to avoid overflow on multiplication.
 289          * Then go back to 32 bits before division to avoid using div_u64().
 290          */
 291         lux64 = lux;
 292         lux64 = lux64 * chip->als_settings.als_gain_trim;
 293         lux64 >>= 13;
 294         lux = lux64;
 295         lux = (lux + 500) / 1000;
 296
 297         if (lux > TSL2583_LUX_CALC_OVER_FLOW) { /* check for overflow */
 298 return_max:
 299                 lux = TSL2583_LUX_CALC_OVER_FLOW;
 300         }
 301
 302         /* Update the structure with the latest VALID lux. */
 303         chip->als_cur_info.lux = lux;
 304         ret = lux;
 305
 306 done:
 307         return ret;
 308 }
 309
 310 /*
 311  * Obtain single reading and calculate the als_gain_trim (later used
 312  * to derive actual lux).
 313  * Return updated gain_trim value.
 314  */
 315 static int tsl2583_als_calibrate(struct iio_dev *indio_dev)
 316 {
 317         struct tsl2583_chip *chip = iio_priv(indio_dev);
 318         unsigned int gain_trim_val;
 319         int ret;
 320         int lux_val;
 321
 322         ret = i2c_smbus_read_byte_data(chip->client,
 323                                        TSL2583_CMD_REG | TSL2583_CNTRL);
 324         if (ret < 0) {
 325                 dev_err(&chip->client->dev,
 326                         "%s: failed to read from the CNTRL register\n",
 327                         __func__);
 328                 return ret;
 329         }
 330
 331         if ((ret & (TSL2583_CNTL_ADC_ENBL | TSL2583_CNTL_PWR_ON))
 332                         != (TSL2583_CNTL_ADC_ENBL | TSL2583_CNTL_PWR_ON)) {
 333                 dev_err(&chip->client->dev,
 334                         "%s: Device is not powered on and/or ADC is not enabled\n",
 335                         __func__);
 336                 return -EINVAL;
 337         } else if ((ret & TSL2583_STA_ADC_VALID) != TSL2583_STA_ADC_VALID) {
 338                 dev_err(&chip->client->dev,
 339                         "%s: The two ADC channels have not completed an integration cycle\n",
 340                         __func__);
 341                 return -ENODATA;
 342         }
 343
 344         lux_val = tsl2583_get_lux(indio_dev);
 345         if (lux_val < 0) {
 346                 dev_err(&chip->client->dev, "%s: failed to get lux\n",
 347                         __func__);
 348                 return lux_val;
 349         }
 350
 351         gain_trim_val = (unsigned int)(((chip->als_settings.als_cal_target)
 352                         * chip->als_settings.als_gain_trim) / lux_val);
 353         if ((gain_trim_val < 250) || (gain_trim_val > 4000)) {
 354                 dev_err(&chip->client->dev,
 355                         "%s: trim_val of %d is not within the range [250, 4000]\n",
 356                         __func__, gain_trim_val);
 357                 return -ENODATA;
 358         }
 359
 360         chip->als_settings.als_gain_trim = (int)gain_trim_val;
 361
 362         return 0;
 363 }
 364
 365 static int tsl2583_set_als_time(struct tsl2583_chip *chip)
 366 {
 367         int als_count, als_time, ret;
 368         u8 val;
 369
 370         /* determine als integration register */
 371         als_count = (chip->als_settings.als_time * 100 + 135) / 270;
 372         if (!als_count)
 373                 als_count = 1; /* ensure at least one cycle */
 374
 375         /* convert back to time (encompasses overrides) */
 376         als_time = (als_count * 27 + 5) / 10;
 377
 378         val = 256 - als_count;
 379         ret = i2c_smbus_write_byte_data(chip->client,
 380                                         TSL2583_CMD_REG | TSL2583_ALS_TIME,
 381                                         val);
 382         if (ret < 0) {
 383                 dev_err(&chip->client->dev, "%s: failed to set the als time to %d\n",
 384                         __func__, val);
 385                 return ret;
 386         }
 387
 388         /* set chip struct re scaling and saturation */
 389         chip->als_saturation = als_count * 922; /* 90% of full scale */
 390         chip->als_time_scale = (als_time + 25) / 50;
 391
 392         return ret;
 393 }
 394
 395 static int tsl2583_set_als_gain(struct tsl2583_chip *chip)
 396 {
 397         int ret;
 398
 399         /* Set the gain based on als_settings struct */
 400         ret = i2c_smbus_write_byte_data(chip->client,
 401                                         TSL2583_CMD_REG | TSL2583_GAIN,
 402                                         chip->als_settings.als_gain);
 403         if (ret < 0)
 404                 dev_err(&chip->client->dev,
 405                         "%s: failed to set the gain to %d\n", __func__,
 406                         chip->als_settings.als_gain);
 407
 408         return ret;
 409 }
 410
 411 static int tsl2583_set_power_state(struct tsl2583_chip *chip, u8 state)
 412 {
 413         int ret;
 414
 415         ret = i2c_smbus_write_byte_data(chip->client,
 416                                         TSL2583_CMD_REG | TSL2583_CNTRL, state);
 417         if (ret < 0)
 418                 dev_err(&chip->client->dev,
 419                         "%s: failed to set the power state to %d\n", __func__,
 420                         state);
 421
 422         return ret;
 423 }
 424
 425 /*
 426  * Turn the device on.
 427  * Configuration must be set before calling this function.
 428  */
 429 static int tsl2583_chip_init_and_power_on(struct iio_dev *indio_dev)
 430 {
 431         struct tsl2583_chip *chip = iio_priv(indio_dev);
 432         int ret;
 433
 434         /* Power on the device; ADC off. */
 435         ret = tsl2583_set_power_state(chip, TSL2583_CNTL_PWR_ON);
 436         if (ret < 0)
 437                 return ret;
 438
 439         ret = i2c_smbus_write_byte_data(chip->client,
 440                                         TSL2583_CMD_REG | TSL2583_INTERRUPT,
 441                                         TSL2583_INTERRUPT_DISABLED);
 442         if (ret < 0) {
 443                 dev_err(&chip->client->dev,
 444                         "%s: failed to disable interrupts\n", __func__);
 445                 return ret;
 446         }
 447
 448         ret = tsl2583_set_als_time(chip);
 449         if (ret < 0)
 450                 return ret;
 451
 452         ret = tsl2583_set_als_gain(chip);
 453         if (ret < 0)
 454                 return ret;
 455
 456         usleep_range(3000, 3500);
 457
 458         ret = tsl2583_set_power_state(chip, TSL2583_CNTL_PWR_ON |
 459                                             TSL2583_CNTL_ADC_ENBL);
 460         if (ret < 0)
 461                 return ret;
 462
 463         chip->suspended = false;
 464
 465         return ret;
 466 }
 467
 468 /* Sysfs Interface Functions */
 469
 470 static ssize_t in_illuminance_input_target_show(struct device *dev,
 471                                                 struct device_attribute *attr,
 472                                                 char *buf)
 473 {
 474         struct iio_dev *indio_dev = dev_to_iio_dev(dev);
 475         struct tsl2583_chip *chip = iio_priv(indio_dev);
 476         int ret;
 477
 478         mutex_lock(&chip->als_mutex);
 479         ret = sprintf(buf, "%d\n", chip->als_settings.als_cal_target);
 480         mutex_unlock(&chip->als_mutex);
 481
 482         return ret;
 483 }
 484
 485 static ssize_t in_illuminance_input_target_store(struct device *dev,
 486                                                  struct device_attribute *attr,
 487                                                  const char *buf, size_t len)
 488 {
 489         struct iio_dev *indio_dev = dev_to_iio_dev(dev);
 490         struct tsl2583_chip *chip = iio_priv(indio_dev);
 491         int value;
 492
 493         if (kstrtoint(buf, 0, &value) || !value)
 494                 return -EINVAL;
 495
 496         mutex_lock(&chip->als_mutex);
 497         chip->als_settings.als_cal_target = value;
 498         mutex_unlock(&chip->als_mutex);
 499
 500         return len;
 501 }
 502
 503 static ssize_t in_illuminance_calibrate_store(struct device *dev,
 504                                               struct device_attribute *attr,
 505                                               const char *buf, size_t len)
 506 {
 507         struct iio_dev *indio_dev = dev_to_iio_dev(dev);
 508         struct tsl2583_chip *chip = iio_priv(indio_dev);
 509         int value, ret;
 510
 511         if (kstrtoint(buf, 0, &value) || value != 1)
 512                 return -EINVAL;
 513
 514         mutex_lock(&chip->als_mutex);
 515
 516         if (chip->suspended) {
 517                 ret = -EBUSY;
 518                 goto done;
 519         }
 520
 521         ret = tsl2583_als_calibrate(indio_dev);
 522         if (ret < 0)
 523                 goto done;
 524
 525         ret = len;
 526 done:
 527         mutex_unlock(&chip->als_mutex);
 528
 529         return ret;
 530 }
 531
 532 static ssize_t in_illuminance_lux_table_show(struct device *dev,
 533                                              struct device_attribute *attr,
 534                                              char *buf)
 535 {
 536         struct iio_dev *indio_dev = dev_to_iio_dev(dev);
 537         struct tsl2583_chip *chip = iio_priv(indio_dev);
 538         unsigned int i;
 539         int offset = 0;
 540
 541         for (i = 0; i < ARRAY_SIZE(chip->als_settings.als_device_lux); i++) {
 542                 offset += sprintf(buf + offset, "%u,%u,%u,",
 543                                   chip->als_settings.als_device_lux[i].ratio,
 544                                   chip->als_settings.als_device_lux[i].ch0,
 545                                   chip->als_settings.als_device_lux[i].ch1);
 546                 if (chip->als_settings.als_device_lux[i].ratio == 0) {
 547                         /*
 548                          * We just printed the first "0" entry.
 549                          * Now get rid of the extra "," and break.
 550                          */
 551                         offset--;
 552                         break;
 553                 }
 554         }
 555
 556         offset += sprintf(buf + offset, "\n");
 557
 558         return offset;
 559 }
 560
 561 static ssize_t in_illuminance_lux_table_store(struct device *dev,
 562                                               struct device_attribute *attr,
 563                                               const char *buf, size_t len)
 564 {
 565         struct iio_dev *indio_dev = dev_to_iio_dev(dev);
 566         struct tsl2583_chip *chip = iio_priv(indio_dev);
 567         const unsigned int max_ints = TSL2583_MAX_LUX_TABLE_ENTRIES * 3;
 568         int value[TSL2583_MAX_LUX_TABLE_ENTRIES * 3 + 1];
 569         int ret = -EINVAL;
 570         unsigned int n;
 571
 572         mutex_lock(&chip->als_mutex);
 573
 574         get_options(buf, ARRAY_SIZE(value), value);
 575
 576         /*
 577          * We now have an array of ints starting at value[1], and
 578          * enumerated by value[0].
 579          * We expect each group of three ints is one table entry,
 580          * and the last table entry is all 0.
 581          */
 582         n = value[0];
 583         if ((n % 3) || n < 6 || n > max_ints) {
 584                 dev_err(dev,
 585                         "%s: The number of entries in the lux table must be a multiple of 3 and within the range [6, %d]\n",
 586                         __func__, max_ints);
 587                 goto done;
 588         }
 589         if ((value[n - 2] | value[n - 1] | value[n]) != 0) {
 590                 dev_err(dev, "%s: The last 3 entries in the lux table must be zeros.\n",
 591                         __func__);
 592                 goto done;
 593         }
 594
 595         memcpy(chip->als_settings.als_device_lux, &value[1],
 596                value[0] * sizeof(value[1]));
 597
 598         ret = len;
 599
 600 done:
 601         mutex_unlock(&chip->als_mutex);
 602
 603         return ret;
 604 }
 605
 606 static IIO_CONST_ATTR(in_illuminance_calibscale_available, "1 8 16 111");
 607 static IIO_CONST_ATTR(in_illuminance_integration_time_available,
 608                       "0.000050 0.000100 0.000150 0.000200 0.000250 0.000300 0.000350 0.000400 0.000450 0.000500 0.000550 0.000600 0.000650");
 609 static IIO_DEVICE_ATTR_RW(in_illuminance_input_target, 0);
 610 static IIO_DEVICE_ATTR_WO(in_illuminance_calibrate, 0);
 611 static IIO_DEVICE_ATTR_RW(in_illuminance_lux_table, 0);
 612
 613 static struct attribute *sysfs_attrs_ctrl[] = {
 614         &iio_const_attr_in_illuminance_calibscale_available.dev_attr.attr,
 615         &iio_const_attr_in_illuminance_integration_time_available.dev_attr.attr,
 616         &iio_dev_attr_in_illuminance_input_target.dev_attr.attr,
 617         &iio_dev_attr_in_illuminance_calibrate.dev_attr.attr,
 618         &iio_dev_attr_in_illuminance_lux_table.dev_attr.attr,
 619         NULL
 620 };
 621
 622 static const struct attribute_group tsl2583_attribute_group = {
 623         .attrs = sysfs_attrs_ctrl,
 624 };
 625
 626 static const struct iio_chan_spec tsl2583_channels[] = {
 627         {
 628                 .type = IIO_LIGHT,
 629                 .modified = 1,
 630                 .channel2 = IIO_MOD_LIGHT_IR,
 631                 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
 632         },
 633         {
 634                 .type = IIO_LIGHT,
 635                 .modified = 1,
 636                 .channel2 = IIO_MOD_LIGHT_BOTH,
 637                 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
 638         },
 639         {
 640                 .type = IIO_LIGHT,
 641                 .info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED) |
 642                                       BIT(IIO_CHAN_INFO_CALIBBIAS) |
 643                                       BIT(IIO_CHAN_INFO_CALIBSCALE) |
 644                                       BIT(IIO_CHAN_INFO_INT_TIME),
 645         },
 646 };
 647
 648 static int tsl2583_read_raw(struct iio_dev *indio_dev,
 649                             struct iio_chan_spec const *chan,
 650                             int *val, int *val2, long mask)
 651 {
 652         struct tsl2583_chip *chip = iio_priv(indio_dev);
 653         int ret = -EINVAL;
 654
 655         mutex_lock(&chip->als_mutex);
 656
 657         if (chip->suspended) {
 658                 ret = -EBUSY;
 659                 goto read_done;
 660         }
 661
 662         switch (mask) {
 663         case IIO_CHAN_INFO_RAW:
 664                 if (chan->type == IIO_LIGHT) {
 665                         ret = tsl2583_get_lux(indio_dev);
 666                         if (ret < 0)
 667                                 goto read_done;
 668
 669                         /*
 670                          * From page 20 of the TSL2581, TSL2583 data
 671                          * sheet (TAOS134 − MARCH 2011):
 672                          *
 673                          * One of the photodiodes (channel 0) is
 674                          * sensitive to both visible and infrared light,
 675                          * while the second photodiode (channel 1) is
 676                          * sensitive primarily to infrared light.
 677                          */
 678                         if (chan->channel2 == IIO_MOD_LIGHT_BOTH)
 679                                 *val = chip->als_cur_info.als_ch0;
 680                         else
 681                                 *val = chip->als_cur_info.als_ch1;
 682
 683                         ret = IIO_VAL_INT;
 684                 }
 685                 break;
 686         case IIO_CHAN_INFO_PROCESSED:
 687                 if (chan->type == IIO_LIGHT) {
 688                         ret = tsl2583_get_lux(indio_dev);
 689                         if (ret < 0)
 690                                 goto read_done;
 691
 692                         *val = ret;
 693                         ret = IIO_VAL_INT;
 694                 }
 695                 break;
 696         case IIO_CHAN_INFO_CALIBBIAS:
 697                 if (chan->type == IIO_LIGHT) {
 698                         *val = chip->als_settings.als_gain_trim;
 699                         ret = IIO_VAL_INT;
 700                 }
 701                 break;
 702         case IIO_CHAN_INFO_CALIBSCALE:
 703                 if (chan->type == IIO_LIGHT) {
 704                         *val = gainadj[chip->als_settings.als_gain].mean;
 705                         ret = IIO_VAL_INT;
 706                 }
 707                 break;
 708         case IIO_CHAN_INFO_INT_TIME:
 709                 if (chan->type == IIO_LIGHT) {
 710                         *val = 0;
 711                         *val2 = chip->als_settings.als_time;
 712                         ret = IIO_VAL_INT_PLUS_MICRO;
 713                 }
 714                 break;
 715         default:
 716                 break;
 717         }
 718
 719 read_done:
 720         mutex_unlock(&chip->als_mutex);
 721
 722         return ret;
 723 }
 724
 725 static int tsl2583_write_raw(struct iio_dev *indio_dev,
 726                              struct iio_chan_spec const *chan,
 727                              int val, int val2, long mask)
 728 {
 729         struct tsl2583_chip *chip = iio_priv(indio_dev);
 730         int ret = -EINVAL;
 731
 732         mutex_lock(&chip->als_mutex);
 733
 734         if (chip->suspended) {
 735                 ret = -EBUSY;
 736                 goto write_done;
 737         }
 738
 739         switch (mask) {
 740         case IIO_CHAN_INFO_CALIBBIAS:
 741                 if (chan->type == IIO_LIGHT) {
 742                         chip->als_settings.als_gain_trim = val;
 743                         ret = 0;
 744                 }
 745                 break;
 746         case IIO_CHAN_INFO_CALIBSCALE:
 747                 if (chan->type == IIO_LIGHT) {
 748                         unsigned int i;
 749
 750                         for (i = 0; i < ARRAY_SIZE(gainadj); i++) {
 751                                 if (gainadj[i].mean == val) {
 752                                         chip->als_settings.als_gain = i;
 753                                         ret = tsl2583_set_als_gain(chip);
 754                                         break;
 755                                 }
 756                         }
 757                 }
 758                 break;
 759         case IIO_CHAN_INFO_INT_TIME:
 760                 if (chan->type == IIO_LIGHT && !val && val2 >= 50 &&
 761                     val2 <= 650 && !(val2 % 50)) {
 762                         chip->als_settings.als_time = val2;
 763                         ret = tsl2583_set_als_time(chip);
 764                 }
 765                 break;
 766         default:
 767                 break;
 768         }
 769
 770 write_done:
 771         mutex_unlock(&chip->als_mutex);
 772
 773         return ret;
 774 }
 775
 776 static const struct iio_info tsl2583_info = {
 777         .attrs = &tsl2583_attribute_group,
 778         .driver_module = THIS_MODULE,
 779         .read_raw = tsl2583_read_raw,
 780         .write_raw = tsl2583_write_raw,
 781 };
 782
 783 static int tsl2583_probe(struct i2c_client *clientp,
 784                          const struct i2c_device_id *idp)
 785 {
 786         int ret;
 787         struct tsl2583_chip *chip;
 788         struct iio_dev *indio_dev;
 789
 790         if (!i2c_check_functionality(clientp->adapter,
 791                                      I2C_FUNC_SMBUS_BYTE_DATA)) {
 792                 dev_err(&clientp->dev, "%s: i2c smbus byte data functionality is unsupported\n",
 793                         __func__);
 794                 return -EOPNOTSUPP;
 795         }
 796
 797         indio_dev = devm_iio_device_alloc(&clientp->dev, sizeof(*chip));
 798         if (!indio_dev)
 799                 return -ENOMEM;
 800
 801         chip = iio_priv(indio_dev);
 802         chip->client = clientp;
 803         i2c_set_clientdata(clientp, indio_dev);
 804
 805         mutex_init(&chip->als_mutex);
 806         chip->suspended = true;
 807
 808         ret = i2c_smbus_read_byte_data(clientp,
 809                                        TSL2583_CMD_REG | TSL2583_CHIPID);
 810         if (ret < 0) {
 811                 dev_err(&clientp->dev,
 812                         "%s: failed to read the chip ID register\n", __func__);
 813                 return ret;
 814         }
 815
 816         if ((ret & TSL2583_CHIP_ID_MASK) != TSL2583_CHIP_ID) {
 817                 dev_err(&clientp->dev, "%s: received an unknown chip ID %x\n",
 818                         __func__, ret);
 819                 return -EINVAL;
 820         }
 821
 822         indio_dev->info = &tsl2583_info;
 823         indio_dev->channels = tsl2583_channels;
 824         indio_dev->num_channels = ARRAY_SIZE(tsl2583_channels);
 825         indio_dev->dev.parent = &clientp->dev;
 826         indio_dev->modes = INDIO_DIRECT_MODE;
 827         indio_dev->name = chip->client->name;
 828
 829         ret = devm_iio_device_register(indio_dev->dev.parent, indio_dev);
 830         if (ret) {
 831                 dev_err(&clientp->dev, "%s: iio registration failed\n",
 832                         __func__);
 833                 return ret;
 834         }
 835
 836         /* Load up the V2 defaults (these are hard coded defaults for now) */
 837         tsl2583_defaults(chip);
 838
 839         /* Make sure the chip is on */
 840         ret = tsl2583_chip_init_and_power_on(indio_dev);
 841         if (ret < 0)
 842                 return ret;
 843
 844         dev_info(&clientp->dev, "Light sensor found.\n");
 845
 846         return 0;
 847 }
 848
 849 static int __maybe_unused tsl2583_suspend(struct device *dev)
 850 {
 851         struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
 852         struct tsl2583_chip *chip = iio_priv(indio_dev);
 853         int ret;
 854
 855         mutex_lock(&chip->als_mutex);
 856
 857         ret = tsl2583_set_power_state(chip, TSL2583_CNTL_PWR_OFF);
 858         chip->suspended = true;
 859
 860         mutex_unlock(&chip->als_mutex);
 861
 862         return ret;
 863 }
 864
 865 static int __maybe_unused tsl2583_resume(struct device *dev)
 866 {
 867         struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
 868         struct tsl2583_chip *chip = iio_priv(indio_dev);
 869         int ret;
 870
 871         mutex_lock(&chip->als_mutex);
 872
 873         ret = tsl2583_chip_init_and_power_on(indio_dev);
 874
 875         mutex_unlock(&chip->als_mutex);
 876
 877         return ret;
 878 }
 879
 880 static SIMPLE_DEV_PM_OPS(tsl2583_pm_ops, tsl2583_suspend, tsl2583_resume);
 881
 882 static struct i2c_device_id tsl2583_idtable[] = {
 883         { "tsl2580", 0 },
 884         { "tsl2581", 1 },
 885         { "tsl2583", 2 },
 886         {}
 887 };
 888 MODULE_DEVICE_TABLE(i2c, tsl2583_idtable);
 889
 890 static const struct of_device_id tsl2583_of_match[] = {
 891         { .compatible = "amstaos,tsl2580", },
 892         { .compatible = "amstaos,tsl2581", },
 893         { .compatible = "amstaos,tsl2583", },
 894         { },
 895 };
 896 MODULE_DEVICE_TABLE(of, tsl2583_of_match);
 897
 898 /* Driver definition */
 899 static struct i2c_driver tsl2583_driver = {
 900         .driver = {
 901                 .name = "tsl2583",
 902                 .pm = &tsl2583_pm_ops,
 903                 .of_match_table = tsl2583_of_match,
 904         },
 905         .id_table = tsl2583_idtable,
 906         .probe = tsl2583_probe,
 907 };
 908 module_i2c_driver(tsl2583_driver);
 909
 910 MODULE_AUTHOR("J. August Brenner <jbrenner@taosinc.com>");
 911 MODULE_AUTHOR("Brian Masney <masneyb@onstation.org>");
 912 MODULE_DESCRIPTION("TAOS tsl2583 ambient light sensor driver");
 913 MODULE_LICENSE("GPL");