drivers/staging/iio/light/tsl2583.c

   1 /*
   2  * Device driver for monitoring ambient light intensity (lux)
   3  * within the TAOS tsl258x family of devices (tsl2580, tsl2581).
   4  *
   5  * Copyright (c) 2011, TAOS Corporation.
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License as published by
   9  * the Free Software Foundation; either version 2 of the License, or
  10  * (at your option) any later version.
  11  *
  12  * This program is distributed in the hope that it will be useful, but WITHOUT
  13  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  14  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  15  * more details.
  16  *
  17  * You should have received a copy of the GNU General Public License along
  18  * with this program; if not, write to the Free Software Foundation, Inc.,
  19  * 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
  20  */
  21
  22 #include <linux/kernel.h>
  23 #include <linux/i2c.h>
  24 #include <linux/errno.h>
  25 #include <linux/delay.h>
  26 #include <linux/string.h>
  27 #include <linux/mutex.h>
  28 #include <linux/unistd.h>
  29 #include <linux/slab.h>
  30 #include <linux/module.h>
  31 #include <linux/iio/iio.h>
  32
  33 #define TSL258X_MAX_DEVICE_REGS         32
  34
  35 /* Triton register offsets */
  36 #define TSL258X_REG_MAX         8
  37
  38 /* Device Registers and Masks */
  39 #define TSL258X_CNTRL                   0x00
  40 #define TSL258X_ALS_TIME                0X01
  41 #define TSL258X_INTERRUPT               0x02
  42 #define TSL258X_GAIN                    0x07
  43 #define TSL258X_REVID                   0x11
  44 #define TSL258X_CHIPID                  0x12
  45 #define TSL258X_ALS_CHAN0LO             0x14
  46 #define TSL258X_ALS_CHAN0HI             0x15
  47 #define TSL258X_ALS_CHAN1LO             0x16
  48 #define TSL258X_ALS_CHAN1HI             0x17
  49 #define TSL258X_TMR_LO                  0x18
  50 #define TSL258X_TMR_HI                  0x19
  51
  52 /* tsl2583 cmd reg masks */
  53 #define TSL258X_CMD_REG                 0x80
  54 #define TSL258X_CMD_SPL_FN              0x60
  55 #define TSL258X_CMD_ALS_INT_CLR 0X01
  56
  57 /* tsl2583 cntrl reg masks */
  58 #define TSL258X_CNTL_ADC_ENBL   0x02
  59 #define TSL258X_CNTL_PWR_ON             0x01
  60
  61 /* tsl2583 status reg masks */
  62 #define TSL258X_STA_ADC_VALID   0x01
  63 #define TSL258X_STA_ADC_INTR    0x10
  64
  65 /* Lux calculation constants */
  66 #define TSL258X_LUX_CALC_OVER_FLOW              65535
  67
  68 enum {
  69         TSL258X_CHIP_UNKNOWN = 0,
  70         TSL258X_CHIP_WORKING = 1,
  71         TSL258X_CHIP_SUSPENDED = 2
  72 };
  73
  74 /* Per-device data */
  75 struct taos_als_info {
  76         u16 als_ch0;
  77         u16 als_ch1;
  78         u16 lux;
  79 };
  80
  81 struct taos_settings {
  82         int als_time;
  83         int als_gain;
  84         int als_gain_trim;
  85         int als_cal_target;
  86 };
  87
  88 struct tsl2583_chip {
  89         struct mutex als_mutex;
  90         struct i2c_client *client;
  91         struct taos_als_info als_cur_info;
  92         struct taos_settings taos_settings;
  93         int als_time_scale;
  94         int als_saturation;
  95         int taos_chip_status;
  96         u8 taos_config[8];
  97 };
  98
  99 /*
 100  * Initial values for device - this values can/will be changed by driver.
 101  * and applications as needed.
 102  * These values are dynamic.
 103  */
 104 static const u8 taos_config[8] = {
 105                 0x00, 0xee, 0x00, 0x03, 0x00, 0xFF, 0xFF, 0x00
 106 }; /*   cntrl atime intC  Athl0 Athl1 Athh0 Athh1 gain */
 107
 108 struct taos_lux {
 109         unsigned int ratio;
 110         unsigned int ch0;
 111         unsigned int ch1;
 112 };
 113
 114 /* This structure is intentionally large to accommodate updates via sysfs. */
 115 /* Sized to 11 = max 10 segments + 1 termination segment */
 116 /* Assumption is one and only one type of glass used  */
 117 static struct taos_lux taos_device_lux[11] = {
 118         {  9830,  8520, 15729 },
 119         { 12452, 10807, 23344 },
 120         { 14746,  6383, 11705 },
 121         { 17695,  4063,  6554 },
 122 };
 123
 124 struct gainadj {
 125         s16 ch0;
 126         s16 ch1;
 127 };
 128
 129 /* Index = (0 - 3) Used to validate the gain selection index */
 130 static const struct gainadj gainadj[] = {
 131         { 1, 1 },
 132         { 8, 8 },
 133         { 16, 16 },
 134         { 107, 115 }
 135 };
 136
 137 /*
 138  * Provides initial operational parameter defaults.
 139  * These defaults may be changed through the device's sysfs files.
 140  */
 141 static void taos_defaults(struct tsl2583_chip *chip)
 142 {
 143         /* Operational parameters */
 144         chip->taos_settings.als_time = 100;
 145         /* must be a multiple of 50mS */
 146         chip->taos_settings.als_gain = 0;
 147         /* this is actually an index into the gain table */
 148         /* assume clear glass as default */
 149         chip->taos_settings.als_gain_trim = 1000;
 150         /* default gain trim to account for aperture effects */
 151         chip->taos_settings.als_cal_target = 130;
 152         /* Known external ALS reading used for calibration */
 153 }
 154
 155 /*
 156  * Read a number of bytes starting at register (reg) location.
 157  * Return 0, or i2c_smbus_write_byte ERROR code.
 158  */
 159 static int
 160 taos_i2c_read(struct i2c_client *client, u8 reg, u8 *val, unsigned int len)
 161 {
 162         int i, ret;
 163
 164         for (i = 0; i < len; i++) {
 165                 /* select register to write */
 166                 ret = i2c_smbus_write_byte(client, (TSL258X_CMD_REG | reg));
 167                 if (ret < 0) {
 168                         dev_err(&client->dev,
 169                                 "taos_i2c_read failed to write register %x\n",
 170                                 reg);
 171                         return ret;
 172                 }
 173                 /* read the data */
 174                 *val = i2c_smbus_read_byte(client);
 175                 val++;
 176                 reg++;
 177         }
 178         return 0;
 179 }
 180
 181 /*
 182  * Reads and calculates current lux value.
 183  * The raw ch0 and ch1 values of the ambient light sensed in the last
 184  * integration cycle are read from the device.
 185  * Time scale factor array values are adjusted based on the integration time.
 186  * The raw values are multiplied by a scale factor, and device gain is obtained
 187  * using gain index. Limit checks are done next, then the ratio of a multiple
 188  * of ch1 value, to the ch0 value, is calculated. The array taos_device_lux[]
 189  * declared above is then scanned to find the first ratio value that is just
 190  * above the ratio we just calculated. The ch0 and ch1 multiplier constants in
 191  * the array are then used along with the time scale factor array values, to
 192  * calculate the lux.
 193  */
 194 static int taos_get_lux(struct iio_dev *indio_dev)
 195 {
 196         u16 ch0, ch1; /* separated ch0/ch1 data from device */
 197         u32 lux; /* raw lux calculated from device data */
 198         u64 lux64;
 199         u32 ratio;
 200         u8 buf[5];
 201         struct taos_lux *p;
 202         struct tsl2583_chip *chip = iio_priv(indio_dev);
 203         int i, ret;
 204         u32 ch0lux = 0;
 205         u32 ch1lux = 0;
 206
 207         if (mutex_trylock(&chip->als_mutex) == 0) {
 208                 dev_info(&chip->client->dev, "taos_get_lux device is busy\n");
 209                 return chip->als_cur_info.lux; /* busy, so return LAST VALUE */
 210         }
 211
 212         if (chip->taos_chip_status != TSL258X_CHIP_WORKING) {
 213                 /* device is not enabled */
 214                 dev_err(&chip->client->dev, "taos_get_lux device is not enabled\n");
 215                 ret = -EBUSY;
 216                 goto out_unlock;
 217         }
 218
 219         ret = taos_i2c_read(chip->client, (TSL258X_CMD_REG), &buf[0], 1);
 220         if (ret < 0) {
 221                 dev_err(&chip->client->dev, "taos_get_lux failed to read CMD_REG\n");
 222                 goto out_unlock;
 223         }
 224         /* is data new & valid */
 225         if (!(buf[0] & TSL258X_STA_ADC_INTR)) {
 226                 dev_err(&chip->client->dev, "taos_get_lux data not valid\n");
 227                 ret = chip->als_cur_info.lux; /* return LAST VALUE */
 228                 goto out_unlock;
 229         }
 230
 231         for (i = 0; i < 4; i++) {
 232                 int reg = TSL258X_CMD_REG | (TSL258X_ALS_CHAN0LO + i);
 233
 234                 ret = taos_i2c_read(chip->client, reg, &buf[i], 1);
 235                 if (ret < 0) {
 236                         dev_err(&chip->client->dev,
 237                                 "taos_get_lux failed to read register %x\n",
 238                                 reg);
 239                         goto out_unlock;
 240                 }
 241         }
 242
 243         /*
 244          * clear status, really interrupt status (interrupts are off), but
 245          * we use the bit anyway - don't forget 0x80 - this is a command
 246          */
 247         ret = i2c_smbus_write_byte(chip->client,
 248                                    (TSL258X_CMD_REG | TSL258X_CMD_SPL_FN |
 249                                     TSL258X_CMD_ALS_INT_CLR));
 250
 251         if (ret < 0) {
 252                 dev_err(&chip->client->dev,
 253                         "taos_i2c_write_command failed in taos_get_lux, err = %d\n",
 254                         ret);
 255                 goto out_unlock; /* have no data, so return failure */
 256         }
 257
 258         /* extract ALS/lux data */
 259         ch0 = le16_to_cpup((const __le16 *)&buf[0]);
 260         ch1 = le16_to_cpup((const __le16 *)&buf[2]);
 261
 262         chip->als_cur_info.als_ch0 = ch0;
 263         chip->als_cur_info.als_ch1 = ch1;
 264
 265         if ((ch0 >= chip->als_saturation) || (ch1 >= chip->als_saturation))
 266                 goto return_max;
 267
 268         if (!ch0) {
 269                 /* have no data, so return LAST VALUE */
 270                 ret = 0;
 271                 chip->als_cur_info.lux = 0;
 272                 goto out_unlock;
 273         }
 274         /* calculate ratio */
 275         ratio = (ch1 << 15) / ch0;
 276         /* convert to unscaled lux using the pointer to the table */
 277         for (p = (struct taos_lux *)taos_device_lux;
 278              p->ratio != 0 && p->ratio < ratio; p++)
 279                 ;
 280
 281         if (p->ratio == 0) {
 282                 lux = 0;
 283         } else {
 284                 ch0lux = ((ch0 * p->ch0) +
 285                           (gainadj[chip->taos_settings.als_gain].ch0 >> 1))
 286                          / gainadj[chip->taos_settings.als_gain].ch0;
 287                 ch1lux = ((ch1 * p->ch1) +
 288                           (gainadj[chip->taos_settings.als_gain].ch1 >> 1))
 289                          / gainadj[chip->taos_settings.als_gain].ch1;
 290                 lux = ch0lux - ch1lux;
 291         }
 292
 293         /* note: lux is 31 bit max at this point */
 294         if (ch1lux > ch0lux) {
 295                 dev_dbg(&chip->client->dev, "No Data - Return last value\n");
 296                 ret = 0;
 297                 chip->als_cur_info.lux = 0;
 298                 goto out_unlock;
 299         }
 300
 301         /* adjust for active time scale */
 302         if (chip->als_time_scale == 0)
 303                 lux = 0;
 304         else
 305                 lux = (lux + (chip->als_time_scale >> 1)) /
 306                         chip->als_time_scale;
 307
 308         /* Adjust for active gain scale.
 309          * The taos_device_lux tables above have a factor of 8192 built in,
 310          * so we need to shift right.
 311          * User-specified gain provides a multiplier.
 312          * Apply user-specified gain before shifting right to retain precision.
 313          * Use 64 bits to avoid overflow on multiplication.
 314          * Then go back to 32 bits before division to avoid using div_u64().
 315          */
 316         lux64 = lux;
 317         lux64 = lux64 * chip->taos_settings.als_gain_trim;
 318         lux64 >>= 13;
 319         lux = lux64;
 320         lux = (lux + 500) / 1000;
 321         if (lux > TSL258X_LUX_CALC_OVER_FLOW) { /* check for overflow */
 322 return_max:
 323                 lux = TSL258X_LUX_CALC_OVER_FLOW;
 324         }
 325
 326         /* Update the structure with the latest VALID lux. */
 327         chip->als_cur_info.lux = lux;
 328         ret = lux;
 329
 330 out_unlock:
 331         mutex_unlock(&chip->als_mutex);
 332         return ret;
 333 }
 334
 335 /*
 336  * Obtain single reading and calculate the als_gain_trim (later used
 337  * to derive actual lux).
 338  * Return updated gain_trim value.
 339  */
 340 static int taos_als_calibrate(struct iio_dev *indio_dev)
 341 {
 342         struct tsl2583_chip *chip = iio_priv(indio_dev);
 343         u8 reg_val;
 344         unsigned int gain_trim_val;
 345         int ret;
 346         int lux_val;
 347
 348         ret = i2c_smbus_write_byte(chip->client,
 349                                    (TSL258X_CMD_REG | TSL258X_CNTRL));
 350         if (ret < 0) {
 351                 dev_err(&chip->client->dev,
 352                         "taos_als_calibrate failed to reach the CNTRL register, ret=%d\n",
 353                         ret);
 354                 return ret;
 355         }
 356
 357         reg_val = i2c_smbus_read_byte(chip->client);
 358         if ((reg_val & (TSL258X_CNTL_ADC_ENBL | TSL258X_CNTL_PWR_ON))
 359                         != (TSL258X_CNTL_ADC_ENBL | TSL258X_CNTL_PWR_ON)) {
 360                 dev_err(&chip->client->dev,
 361                         "taos_als_calibrate failed: device not powered on with ADC enabled\n");
 362                 return -1;
 363         }
 364
 365         ret = i2c_smbus_write_byte(chip->client,
 366                                    (TSL258X_CMD_REG | TSL258X_CNTRL));
 367         if (ret < 0) {
 368                 dev_err(&chip->client->dev,
 369                         "taos_als_calibrate failed to reach the STATUS register, ret=%d\n",
 370                         ret);
 371                 return ret;
 372         }
 373         reg_val = i2c_smbus_read_byte(chip->client);
 374
 375         if ((reg_val & TSL258X_STA_ADC_VALID) != TSL258X_STA_ADC_VALID) {
 376                 dev_err(&chip->client->dev,
 377                         "taos_als_calibrate failed: STATUS - ADC not valid.\n");
 378                 return -ENODATA;
 379         }
 380         lux_val = taos_get_lux(indio_dev);
 381         if (lux_val < 0) {
 382                 dev_err(&chip->client->dev, "taos_als_calibrate failed to get lux\n");
 383                 return lux_val;
 384         }
 385         gain_trim_val = (unsigned int)(((chip->taos_settings.als_cal_target)
 386                         * chip->taos_settings.als_gain_trim) / lux_val);
 387
 388         if ((gain_trim_val < 250) || (gain_trim_val > 4000)) {
 389                 dev_err(&chip->client->dev,
 390                         "taos_als_calibrate failed: trim_val of %d is out of range\n",
 391                         gain_trim_val);
 392                 return -ENODATA;
 393         }
 394         chip->taos_settings.als_gain_trim = (int)gain_trim_val;
 395
 396         return (int)gain_trim_val;
 397 }
 398
 399 /*
 400  * Turn the device on.
 401  * Configuration must be set before calling this function.
 402  */
 403 static int taos_chip_on(struct iio_dev *indio_dev)
 404 {
 405         int i;
 406         int ret;
 407         u8 *uP;
 408         u8 utmp;
 409         int als_count;
 410         int als_time;
 411         struct tsl2583_chip *chip = iio_priv(indio_dev);
 412
 413         /* and make sure we're not already on */
 414         if (chip->taos_chip_status == TSL258X_CHIP_WORKING) {
 415                 /* if forcing a register update - turn off, then on */
 416                 dev_info(&chip->client->dev, "device is already enabled\n");
 417                 return -EINVAL;
 418         }
 419
 420         /* determine als integration register */
 421         als_count = (chip->taos_settings.als_time * 100 + 135) / 270;
 422         if (!als_count)
 423                 als_count = 1; /* ensure at least one cycle */
 424
 425         /* convert back to time (encompasses overrides) */
 426         als_time = (als_count * 27 + 5) / 10;
 427         chip->taos_config[TSL258X_ALS_TIME] = 256 - als_count;
 428
 429         /* Set the gain based on taos_settings struct */
 430         chip->taos_config[TSL258X_GAIN] = chip->taos_settings.als_gain;
 431
 432         /* set chip struct re scaling and saturation */
 433         chip->als_saturation = als_count * 922; /* 90% of full scale */
 434         chip->als_time_scale = (als_time + 25) / 50;
 435
 436         /*
 437          * TSL258x Specific power-on / adc enable sequence
 438          * Power on the device 1st.
 439          */
 440         utmp = TSL258X_CNTL_PWR_ON;
 441         ret = i2c_smbus_write_byte_data(chip->client,
 442                                         TSL258X_CMD_REG | TSL258X_CNTRL, utmp);
 443         if (ret < 0) {
 444                 dev_err(&chip->client->dev, "taos_chip_on failed on CNTRL reg.\n");
 445                 return ret;
 446         }
 447
 448         /*
 449          * Use the following shadow copy for our delay before enabling ADC.
 450          * Write all the registers.
 451          */
 452         for (i = 0, uP = chip->taos_config; i < TSL258X_REG_MAX; i++) {
 453                 ret = i2c_smbus_write_byte_data(chip->client,
 454                                                 TSL258X_CMD_REG + i,
 455                                                 *uP++);
 456                 if (ret < 0) {
 457                         dev_err(&chip->client->dev,
 458                                 "taos_chip_on failed on reg %d.\n", i);
 459                         return ret;
 460                 }
 461         }
 462
 463         usleep_range(3000, 3500);
 464         /*
 465          * NOW enable the ADC
 466          * initialize the desired mode of operation
 467          */
 468         utmp = TSL258X_CNTL_PWR_ON | TSL258X_CNTL_ADC_ENBL;
 469         ret = i2c_smbus_write_byte_data(chip->client,
 470                                         TSL258X_CMD_REG | TSL258X_CNTRL,
 471                                         utmp);
 472         if (ret < 0) {
 473                 dev_err(&chip->client->dev, "taos_chip_on failed on 2nd CTRL reg.\n");
 474                 return ret;
 475         }
 476         chip->taos_chip_status = TSL258X_CHIP_WORKING;
 477
 478         return ret;
 479 }
 480
 481 static int taos_chip_off(struct iio_dev *indio_dev)
 482 {
 483         struct tsl2583_chip *chip = iio_priv(indio_dev);
 484
 485         /* turn device off */
 486         chip->taos_chip_status = TSL258X_CHIP_SUSPENDED;
 487         return i2c_smbus_write_byte_data(chip->client,
 488                                         TSL258X_CMD_REG | TSL258X_CNTRL,
 489                                         0x00);
 490 }
 491
 492 /* Sysfs Interface Functions */
 493
 494 static ssize_t taos_power_state_show(struct device *dev,
 495                                      struct device_attribute *attr, char *buf)
 496 {
 497         struct iio_dev *indio_dev = dev_to_iio_dev(dev);
 498         struct tsl2583_chip *chip = iio_priv(indio_dev);
 499
 500         return sprintf(buf, "%d\n", chip->taos_chip_status);
 501 }
 502
 503 static ssize_t taos_power_state_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         int value;
 509
 510         if (kstrtoint(buf, 0, &value))
 511                 return -EINVAL;
 512
 513         if (!value)
 514                 taos_chip_off(indio_dev);
 515         else
 516                 taos_chip_on(indio_dev);
 517
 518         return len;
 519 }
 520
 521 static ssize_t taos_gain_show(struct device *dev,
 522                               struct device_attribute *attr, char *buf)
 523 {
 524         struct iio_dev *indio_dev = dev_to_iio_dev(dev);
 525         struct tsl2583_chip *chip = iio_priv(indio_dev);
 526         char gain[4] = {0};
 527
 528         switch (chip->taos_settings.als_gain) {
 529         case 0:
 530                 strcpy(gain, "001");
 531                 break;
 532         case 1:
 533                 strcpy(gain, "008");
 534                 break;
 535         case 2:
 536                 strcpy(gain, "016");
 537                 break;
 538         case 3:
 539                 strcpy(gain, "111");
 540                 break;
 541         }
 542
 543         return sprintf(buf, "%s\n", gain);
 544 }
 545
 546 static ssize_t taos_gain_store(struct device *dev,
 547                                struct device_attribute *attr,
 548                                const char *buf, size_t len)
 549 {
 550         struct iio_dev *indio_dev = dev_to_iio_dev(dev);
 551         struct tsl2583_chip *chip = iio_priv(indio_dev);
 552         int value;
 553
 554         if (kstrtoint(buf, 0, &value))
 555                 return -EINVAL;
 556
 557         switch (value) {
 558         case 1:
 559                 chip->taos_settings.als_gain = 0;
 560                 break;
 561         case 8:
 562                 chip->taos_settings.als_gain = 1;
 563                 break;
 564         case 16:
 565                 chip->taos_settings.als_gain = 2;
 566                 break;
 567         case 111:
 568                 chip->taos_settings.als_gain = 3;
 569                 break;
 570         default:
 571                 dev_err(dev, "Invalid Gain Index (must be 1,8,16,111)\n");
 572                 return -1;
 573         }
 574
 575         return len;
 576 }
 577
 578 static ssize_t taos_gain_available_show(struct device *dev,
 579                                         struct device_attribute *attr,
 580                                         char *buf)
 581 {
 582         return sprintf(buf, "%s\n", "1 8 16 111");
 583 }
 584
 585 static ssize_t taos_als_time_show(struct device *dev,
 586                                   struct device_attribute *attr, char *buf)
 587 {
 588         struct iio_dev *indio_dev = dev_to_iio_dev(dev);
 589         struct tsl2583_chip *chip = iio_priv(indio_dev);
 590
 591         return sprintf(buf, "%d\n", chip->taos_settings.als_time);
 592 }
 593
 594 static ssize_t taos_als_time_store(struct device *dev,
 595                                    struct device_attribute *attr,
 596                                    const char *buf, size_t len)
 597 {
 598         struct iio_dev *indio_dev = dev_to_iio_dev(dev);
 599         struct tsl2583_chip *chip = iio_priv(indio_dev);
 600         int value;
 601
 602         if (kstrtoint(buf, 0, &value))
 603                 return -EINVAL;
 604
 605         if ((value < 50) || (value > 650))
 606                 return -EINVAL;
 607
 608         if (value % 50)
 609                 return -EINVAL;
 610
 611         chip->taos_settings.als_time = value;
 612
 613         return len;
 614 }
 615
 616 static ssize_t taos_als_time_available_show(struct device *dev,
 617                                             struct device_attribute *attr,
 618                                             char *buf)
 619 {
 620         return sprintf(buf, "%s\n",
 621                 "50 100 150 200 250 300 350 400 450 500 550 600 650");
 622 }
 623
 624 static ssize_t taos_als_trim_show(struct device *dev,
 625                                   struct device_attribute *attr, char *buf)
 626 {
 627         struct iio_dev *indio_dev = dev_to_iio_dev(dev);
 628         struct tsl2583_chip *chip = iio_priv(indio_dev);
 629
 630         return sprintf(buf, "%d\n", chip->taos_settings.als_gain_trim);
 631 }
 632
 633 static ssize_t taos_als_trim_store(struct device *dev,
 634                                    struct device_attribute *attr,
 635                                    const char *buf, size_t len)
 636 {
 637         struct iio_dev *indio_dev = dev_to_iio_dev(dev);
 638         struct tsl2583_chip *chip = iio_priv(indio_dev);
 639         int value;
 640
 641         if (kstrtoint(buf, 0, &value))
 642                 return -EINVAL;
 643
 644         if (value)
 645                 chip->taos_settings.als_gain_trim = value;
 646
 647         return len;
 648 }
 649
 650 static ssize_t taos_als_cal_target_show(struct device *dev,
 651                                         struct device_attribute *attr,
 652                                         char *buf)
 653 {
 654         struct iio_dev *indio_dev = dev_to_iio_dev(dev);
 655         struct tsl2583_chip *chip = iio_priv(indio_dev);
 656
 657         return sprintf(buf, "%d\n", chip->taos_settings.als_cal_target);
 658 }
 659
 660 static ssize_t taos_als_cal_target_store(struct device *dev,
 661                                          struct device_attribute *attr,
 662                                          const char *buf, size_t len)
 663 {
 664         struct iio_dev *indio_dev = dev_to_iio_dev(dev);
 665         struct tsl2583_chip *chip = iio_priv(indio_dev);
 666         int value;
 667
 668         if (kstrtoint(buf, 0, &value))
 669                 return -EINVAL;
 670
 671         if (value)
 672                 chip->taos_settings.als_cal_target = value;
 673
 674         return len;
 675 }
 676
 677 static ssize_t taos_lux_show(struct device *dev, struct device_attribute *attr,
 678                              char *buf)
 679 {
 680         int ret;
 681
 682         ret = taos_get_lux(dev_to_iio_dev(dev));
 683         if (ret < 0)
 684                 return ret;
 685
 686         return sprintf(buf, "%d\n", ret);
 687 }
 688
 689 static ssize_t taos_do_calibrate(struct device *dev,
 690                                  struct device_attribute *attr,
 691                                  const char *buf, size_t len)
 692 {
 693         struct iio_dev *indio_dev = dev_to_iio_dev(dev);
 694         int value;
 695
 696         if (kstrtoint(buf, 0, &value))
 697                 return -EINVAL;
 698
 699         if (value == 1)
 700                 taos_als_calibrate(indio_dev);
 701
 702         return len;
 703 }
 704
 705 static ssize_t taos_luxtable_show(struct device *dev,
 706                                   struct device_attribute *attr, char *buf)
 707 {
 708         int i;
 709         int offset = 0;
 710
 711         for (i = 0; i < ARRAY_SIZE(taos_device_lux); i++) {
 712                 offset += sprintf(buf + offset, "%u,%u,%u,",
 713                                   taos_device_lux[i].ratio,
 714                                   taos_device_lux[i].ch0,
 715                                   taos_device_lux[i].ch1);
 716                 if (taos_device_lux[i].ratio == 0) {
 717                         /*
 718                          * We just printed the first "0" entry.
 719                          * Now get rid of the extra "," and break.
 720                          */
 721                         offset--;
 722                         break;
 723                 }
 724         }
 725
 726         offset += sprintf(buf + offset, "\n");
 727         return offset;
 728 }
 729
 730 static ssize_t taos_luxtable_store(struct device *dev,
 731                                    struct device_attribute *attr,
 732                                    const char *buf, size_t len)
 733 {
 734         struct iio_dev *indio_dev = dev_to_iio_dev(dev);
 735         struct tsl2583_chip *chip = iio_priv(indio_dev);
 736         int value[ARRAY_SIZE(taos_device_lux) * 3 + 1];
 737         int n;
 738
 739         get_options(buf, ARRAY_SIZE(value), value);
 740
 741         /* We now have an array of ints starting at value[1], and
 742          * enumerated by value[0].
 743          * We expect each group of three ints is one table entry,
 744          * and the last table entry is all 0.
 745          */
 746         n = value[0];
 747         if ((n % 3) || n < 6 || n > ((ARRAY_SIZE(taos_device_lux) - 1) * 3)) {
 748                 dev_info(dev, "LUX TABLE INPUT ERROR 1 Value[0]=%d\n", n);
 749                 return -EINVAL;
 750         }
 751         if ((value[(n - 2)] | value[(n - 1)] | value[n]) != 0) {
 752                 dev_info(dev, "LUX TABLE INPUT ERROR 2 Value[0]=%d\n", n);
 753                 return -EINVAL;
 754         }
 755
 756         if (chip->taos_chip_status == TSL258X_CHIP_WORKING)
 757                 taos_chip_off(indio_dev);
 758
 759         /* Zero out the table */
 760         memset(taos_device_lux, 0, sizeof(taos_device_lux));
 761         memcpy(taos_device_lux, &value[1], (value[0] * 4));
 762
 763         taos_chip_on(indio_dev);
 764
 765         return len;
 766 }
 767
 768 static DEVICE_ATTR(power_state, S_IRUGO | S_IWUSR,
 769                 taos_power_state_show, taos_power_state_store);
 770
 771 static DEVICE_ATTR(illuminance0_calibscale, S_IRUGO | S_IWUSR,
 772                 taos_gain_show, taos_gain_store);
 773 static DEVICE_ATTR(illuminance0_calibscale_available, S_IRUGO,
 774                 taos_gain_available_show, NULL);
 775
 776 static DEVICE_ATTR(illuminance0_integration_time, S_IRUGO | S_IWUSR,
 777                 taos_als_time_show, taos_als_time_store);
 778 static DEVICE_ATTR(illuminance0_integration_time_available, S_IRUGO,
 779                 taos_als_time_available_show, NULL);
 780
 781 static DEVICE_ATTR(illuminance0_calibbias, S_IRUGO | S_IWUSR,
 782                 taos_als_trim_show, taos_als_trim_store);
 783
 784 static DEVICE_ATTR(illuminance0_input_target, S_IRUGO | S_IWUSR,
 785                 taos_als_cal_target_show, taos_als_cal_target_store);
 786
 787 static DEVICE_ATTR(illuminance0_input, S_IRUGO, taos_lux_show, NULL);
 788 static DEVICE_ATTR(illuminance0_calibrate, S_IWUSR, NULL, taos_do_calibrate);
 789 static DEVICE_ATTR(illuminance0_lux_table, S_IRUGO | S_IWUSR,
 790                 taos_luxtable_show, taos_luxtable_store);
 791
 792 static struct attribute *sysfs_attrs_ctrl[] = {
 793         &dev_attr_power_state.attr,
 794         &dev_attr_illuminance0_calibscale.attr,                 /* Gain  */
 795         &dev_attr_illuminance0_calibscale_available.attr,
 796         &dev_attr_illuminance0_integration_time.attr,   /* I time*/
 797         &dev_attr_illuminance0_integration_time_available.attr,
 798         &dev_attr_illuminance0_calibbias.attr,                  /* trim  */
 799         &dev_attr_illuminance0_input_target.attr,
 800         &dev_attr_illuminance0_input.attr,
 801         &dev_attr_illuminance0_calibrate.attr,
 802         &dev_attr_illuminance0_lux_table.attr,
 803         NULL
 804 };
 805
 806 static const struct attribute_group tsl2583_attribute_group = {
 807         .attrs = sysfs_attrs_ctrl,
 808 };
 809
 810 /* Use the default register values to identify the Taos device */
 811 static int taos_tsl258x_device(unsigned char *bufp)
 812 {
 813         return ((bufp[TSL258X_CHIPID] & 0xf0) == 0x90);
 814 }
 815
 816 static const struct iio_info tsl2583_info = {
 817         .attrs = &tsl2583_attribute_group,
 818         .driver_module = THIS_MODULE,
 819 };
 820
 821 /*
 822  * Client probe function - When a valid device is found, the driver's device
 823  * data structure is updated, and initialization completes successfully.
 824  */
 825 static int taos_probe(struct i2c_client *clientp,
 826                       const struct i2c_device_id *idp)
 827 {
 828         int i, ret;
 829         unsigned char buf[TSL258X_MAX_DEVICE_REGS];
 830         struct tsl2583_chip *chip;
 831         struct iio_dev *indio_dev;
 832
 833         if (!i2c_check_functionality(clientp->adapter,
 834                                      I2C_FUNC_SMBUS_BYTE_DATA)) {
 835                 dev_err(&clientp->dev, "taos_probe() - i2c smbus byte data func unsupported\n");
 836                 return -EOPNOTSUPP;
 837         }
 838
 839         indio_dev = devm_iio_device_alloc(&clientp->dev, sizeof(*chip));
 840         if (!indio_dev)
 841                 return -ENOMEM;
 842         chip = iio_priv(indio_dev);
 843         chip->client = clientp;
 844         i2c_set_clientdata(clientp, indio_dev);
 845
 846         mutex_init(&chip->als_mutex);
 847         chip->taos_chip_status = TSL258X_CHIP_UNKNOWN;
 848         memcpy(chip->taos_config, taos_config, sizeof(chip->taos_config));
 849
 850         for (i = 0; i < TSL258X_MAX_DEVICE_REGS; i++) {
 851                 ret = i2c_smbus_write_byte(clientp,
 852                                 (TSL258X_CMD_REG | (TSL258X_CNTRL + i)));
 853                 if (ret < 0) {
 854                         dev_err(&clientp->dev,
 855                                 "i2c_smbus_write_byte to cmd reg failed in taos_probe(), err = %d\n",
 856                                 ret);
 857                         return ret;
 858                 }
 859                 ret = i2c_smbus_read_byte(clientp);
 860                 if (ret < 0) {
 861                         dev_err(&clientp->dev,
 862                                 "i2c_smbus_read_byte from reg failed in taos_probe(), err = %d\n",
 863                                 ret);
 864                         return ret;
 865                 }
 866                 buf[i] = ret;
 867         }
 868
 869         if (!taos_tsl258x_device(buf)) {
 870                 dev_info(&clientp->dev,
 871                          "i2c device found but does not match expected id in taos_probe()\n");
 872                 return -EINVAL;
 873         }
 874
 875         ret = i2c_smbus_write_byte(clientp, (TSL258X_CMD_REG | TSL258X_CNTRL));
 876         if (ret < 0) {
 877                 dev_err(&clientp->dev,
 878                         "i2c_smbus_write_byte() to cmd reg failed in taos_probe(), err = %d\n",
 879                         ret);
 880                 return ret;
 881         }
 882
 883         indio_dev->info = &tsl2583_info;
 884         indio_dev->dev.parent = &clientp->dev;
 885         indio_dev->modes = INDIO_DIRECT_MODE;
 886         indio_dev->name = chip->client->name;
 887         ret = devm_iio_device_register(indio_dev->dev.parent, indio_dev);
 888         if (ret) {
 889                 dev_err(&clientp->dev, "iio registration failed\n");
 890                 return ret;
 891         }
 892
 893         /* Load up the V2 defaults (these are hard coded defaults for now) */
 894         taos_defaults(chip);
 895
 896         /* Make sure the chip is on */
 897         taos_chip_on(indio_dev);
 898
 899         dev_info(&clientp->dev, "Light sensor found.\n");
 900         return 0;
 901 }
 902
 903 #ifdef CONFIG_PM_SLEEP
 904 static int taos_suspend(struct device *dev)
 905 {
 906         struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
 907         struct tsl2583_chip *chip = iio_priv(indio_dev);
 908         int ret = 0;
 909
 910         mutex_lock(&chip->als_mutex);
 911
 912         if (chip->taos_chip_status == TSL258X_CHIP_WORKING) {
 913                 ret = taos_chip_off(indio_dev);
 914                 chip->taos_chip_status = TSL258X_CHIP_SUSPENDED;
 915         }
 916
 917         mutex_unlock(&chip->als_mutex);
 918         return ret;
 919 }
 920
 921 static int taos_resume(struct device *dev)
 922 {
 923         struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
 924         struct tsl2583_chip *chip = iio_priv(indio_dev);
 925         int ret = 0;
 926
 927         mutex_lock(&chip->als_mutex);
 928
 929         if (chip->taos_chip_status == TSL258X_CHIP_SUSPENDED)
 930                 ret = taos_chip_on(indio_dev);
 931
 932         mutex_unlock(&chip->als_mutex);
 933         return ret;
 934 }
 935
 936 static SIMPLE_DEV_PM_OPS(taos_pm_ops, taos_suspend, taos_resume);
 937 #define TAOS_PM_OPS (&taos_pm_ops)
 938 #else
 939 #define TAOS_PM_OPS NULL
 940 #endif
 941
 942 static struct i2c_device_id taos_idtable[] = {
 943         { "tsl2580", 0 },
 944         { "tsl2581", 1 },
 945         { "tsl2583", 2 },
 946         {}
 947 };
 948 MODULE_DEVICE_TABLE(i2c, taos_idtable);
 949
 950 /* Driver definition */
 951 static struct i2c_driver taos_driver = {
 952         .driver = {
 953                 .name = "tsl2583",
 954                 .pm = TAOS_PM_OPS,
 955         },
 956         .id_table = taos_idtable,
 957         .probe = taos_probe,
 958 };
 959 module_i2c_driver(taos_driver);
 960
 961 MODULE_AUTHOR("J. August Brenner<jbrenner@taosinc.com>");
 962 MODULE_DESCRIPTION("TAOS tsl2583 ambient light sensor driver");
 963 MODULE_LICENSE("GPL");