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 "../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 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, "taos_i2c_read failed to write"
 169                                 " register %x\n", reg);
 170                         return ret;
 171                 }
 172                 /* read the data */
 173                 *val = i2c_smbus_read_byte(client);
 174                 val++;
 175                 reg++;
 176         }
 177         return 0;
 178 }
 179
 180 /*
 181  * Reads and calculates current lux value.
 182  * The raw ch0 and ch1 values of the ambient light sensed in the last
 183  * integration cycle are read from the device.
 184  * Time scale factor array values are adjusted based on the integration time.
 185  * The raw values are multiplied by a scale factor, and device gain is obtained
 186  * using gain index. Limit checks are done next, then the ratio of a multiple
 187  * of ch1 value, to the ch0 value, is calculated. The array taos_device_lux[]
 188  * declared above is then scanned to find the first ratio value that is just
 189  * above the ratio we just calculated. The ch0 and ch1 multiplier constants in
 190  * the array are then used along with the time scale factor array values, to
 191  * calculate the lux.
 192  */
 193 static int taos_get_lux(struct iio_dev *indio_dev)
 194 {
 195         u16 ch0, ch1; /* separated ch0/ch1 data from device */
 196         u32 lux; /* raw lux calculated from device data */
 197         u32 ratio;
 198         u8 buf[5];
 199         struct taos_lux *p;
 200         struct tsl2583_chip *chip = iio_priv(indio_dev);
 201         int i, ret;
 202         u32 ch0lux = 0;
 203         u32 ch1lux = 0;
 204
 205         if (mutex_trylock(&chip->als_mutex) == 0) {
 206                 dev_info(&chip->client->dev, "taos_get_lux device is busy\n");
 207                 return chip->als_cur_info.lux; /* busy, so return LAST VALUE */
 208         }
 209
 210         if (chip->taos_chip_status != TSL258X_CHIP_WORKING) {
 211                 /* device is not enabled */
 212                 dev_err(&chip->client->dev, "taos_get_lux device is not enabled\n");
 213                 ret = -EBUSY ;
 214                 goto out_unlock;
 215         }
 216
 217         ret = taos_i2c_read(chip->client, (TSL258X_CMD_REG), &buf[0], 1);
 218         if (ret < 0) {
 219                 dev_err(&chip->client->dev, "taos_get_lux failed to read CMD_REG\n");
 220                 goto out_unlock;
 221         }
 222         /* is data new & valid */
 223         if (!(buf[0] & TSL258X_STA_ADC_INTR)) {
 224                 dev_err(&chip->client->dev, "taos_get_lux data not valid\n");
 225                 ret = chip->als_cur_info.lux; /* return LAST VALUE */
 226                 goto out_unlock;
 227         }
 228
 229         for (i = 0; i < 4; i++) {
 230                 int reg = TSL258X_CMD_REG | (TSL258X_ALS_CHAN0LO + i);
 231                 ret = taos_i2c_read(chip->client, reg, &buf[i], 1);
 232                 if (ret < 0) {
 233                         dev_err(&chip->client->dev, "taos_get_lux failed to read"
 234                                 " register %x\n", reg);
 235                         goto out_unlock;
 236                 }
 237         }
 238
 239         /* clear status, really interrupt status (interrupts are off), but
 240          * we use the bit anyway - don't forget 0x80 - this is a command*/
 241         ret = i2c_smbus_write_byte(chip->client,
 242                                    (TSL258X_CMD_REG | TSL258X_CMD_SPL_FN |
 243                                     TSL258X_CMD_ALS_INT_CLR));
 244
 245         if (ret < 0) {
 246                 dev_err(&chip->client->dev,
 247                         "taos_i2c_write_command failed in taos_get_lux, err = %d\n",
 248                         ret);
 249                 goto out_unlock; /* have no data, so return failure */
 250         }
 251
 252         /* extract ALS/lux data */
 253         ch0 = le16_to_cpup((const __le16 *)&buf[0]);
 254         ch1 = le16_to_cpup((const __le16 *)&buf[2]);
 255
 256         chip->als_cur_info.als_ch0 = ch0;
 257         chip->als_cur_info.als_ch1 = ch1;
 258
 259         if ((ch0 >= chip->als_saturation) || (ch1 >= chip->als_saturation))
 260                 goto return_max;
 261
 262         if (ch0 == 0) {
 263                 /* have no data, so return LAST VALUE */
 264                 ret = chip->als_cur_info.lux = 0;
 265                 goto out_unlock;
 266         }
 267         /* calculate ratio */
 268         ratio = (ch1 << 15) / ch0;
 269         /* convert to unscaled lux using the pointer to the table */
 270         for (p = (struct taos_lux *) taos_device_lux;
 271              p->ratio != 0 && p->ratio < ratio; p++)
 272                 ;
 273
 274         if (p->ratio == 0) {
 275                 lux = 0;
 276         } else {
 277                 ch0lux = ((ch0 * p->ch0) +
 278                           (gainadj[chip->taos_settings.als_gain].ch0 >> 1))
 279                          / gainadj[chip->taos_settings.als_gain].ch0;
 280                 ch1lux = ((ch1 * p->ch1) +
 281                           (gainadj[chip->taos_settings.als_gain].ch1 >> 1))
 282                          / gainadj[chip->taos_settings.als_gain].ch1;
 283                 lux = ch0lux - ch1lux;
 284         }
 285
 286         /* note: lux is 31 bit max at this point */
 287         if (ch1lux > ch0lux) {
 288                 dev_dbg(&chip->client->dev, "No Data - Return last value\n");
 289                 ret = chip->als_cur_info.lux = 0;
 290                 goto out_unlock;
 291         }
 292
 293         /* adjust for active time scale */
 294         if (chip->als_time_scale == 0)
 295                 lux = 0;
 296         else
 297                 lux = (lux + (chip->als_time_scale >> 1)) /
 298                         chip->als_time_scale;
 299
 300         /* adjust for active gain scale */
 301         lux >>= 13; /* tables have factor of 8192 builtin for accuracy */
 302         lux = (lux * chip->taos_settings.als_gain_trim + 500) / 1000;
 303         if (lux > TSL258X_LUX_CALC_OVER_FLOW) { /* check for overflow */
 304 return_max:
 305                 lux = TSL258X_LUX_CALC_OVER_FLOW;
 306         }
 307
 308         /* Update the structure with the latest VALID lux. */
 309         chip->als_cur_info.lux = lux;
 310         ret = lux;
 311
 312 out_unlock:
 313         mutex_unlock(&chip->als_mutex);
 314         return ret;
 315 }
 316
 317 /*
 318  * Obtain single reading and calculate the als_gain_trim (later used
 319  * to derive actual lux).
 320  * Return updated gain_trim value.
 321  */
 322 static int taos_als_calibrate(struct iio_dev *indio_dev)
 323 {
 324         struct tsl2583_chip *chip = iio_priv(indio_dev);
 325         u8 reg_val;
 326         unsigned int gain_trim_val;
 327         int ret;
 328         int lux_val;
 329
 330         ret = i2c_smbus_write_byte(chip->client,
 331                                    (TSL258X_CMD_REG | TSL258X_CNTRL));
 332         if (ret < 0) {
 333                 dev_err(&chip->client->dev,
 334                         "taos_als_calibrate failed to reach the CNTRL register, ret=%d\n",
 335                         ret);
 336                 return ret;
 337         }
 338
 339         reg_val = i2c_smbus_read_byte(chip->client);
 340         if ((reg_val & (TSL258X_CNTL_ADC_ENBL | TSL258X_CNTL_PWR_ON))
 341                         != (TSL258X_CNTL_ADC_ENBL | TSL258X_CNTL_PWR_ON)) {
 342                 dev_err(&chip->client->dev,
 343                         "taos_als_calibrate failed: device not powered on with ADC enabled\n");
 344                 return -1;
 345         }
 346
 347         ret = i2c_smbus_write_byte(chip->client,
 348                                    (TSL258X_CMD_REG | TSL258X_CNTRL));
 349         if (ret < 0) {
 350                 dev_err(&chip->client->dev,
 351                         "taos_als_calibrate failed to reach the STATUS register, ret=%d\n",
 352                         ret);
 353                 return ret;
 354         }
 355         reg_val = i2c_smbus_read_byte(chip->client);
 356
 357         if ((reg_val & TSL258X_STA_ADC_VALID) != TSL258X_STA_ADC_VALID) {
 358                 dev_err(&chip->client->dev,
 359                         "taos_als_calibrate failed: STATUS - ADC not valid.\n");
 360                 return -ENODATA;
 361         }
 362         lux_val = taos_get_lux(indio_dev);
 363         if (lux_val < 0) {
 364                 dev_err(&chip->client->dev, "taos_als_calibrate failed to get lux\n");
 365                 return lux_val;
 366         }
 367         gain_trim_val = (unsigned int) (((chip->taos_settings.als_cal_target)
 368                         * chip->taos_settings.als_gain_trim) / lux_val);
 369
 370         if ((gain_trim_val < 250) || (gain_trim_val > 4000)) {
 371                 dev_err(&chip->client->dev,
 372                         "taos_als_calibrate failed: trim_val of %d is out of range\n",
 373                         gain_trim_val);
 374                 return -ENODATA;
 375         }
 376         chip->taos_settings.als_gain_trim = (int) gain_trim_val;
 377
 378         return (int) gain_trim_val;
 379 }
 380
 381 /*
 382  * Turn the device on.
 383  * Configuration must be set before calling this function.
 384  */
 385 static int taos_chip_on(struct iio_dev *indio_dev)
 386 {
 387         int i;
 388         int ret;
 389         u8 *uP;
 390         u8 utmp;
 391         int als_count;
 392         int als_time;
 393         struct tsl2583_chip *chip = iio_priv(indio_dev);
 394
 395         /* and make sure we're not already on */
 396         if (chip->taos_chip_status == TSL258X_CHIP_WORKING) {
 397                 /* if forcing a register update - turn off, then on */
 398                 dev_info(&chip->client->dev, "device is already enabled\n");
 399                 return -EINVAL;
 400         }
 401
 402         /* determine als integration regster */
 403         als_count = (chip->taos_settings.als_time * 100 + 135) / 270;
 404         if (als_count == 0)
 405                 als_count = 1; /* ensure at least one cycle */
 406
 407         /* convert back to time (encompasses overrides) */
 408         als_time = (als_count * 27 + 5) / 10;
 409         chip->taos_config[TSL258X_ALS_TIME] = 256 - als_count;
 410
 411         /* Set the gain based on taos_settings struct */
 412         chip->taos_config[TSL258X_GAIN] = chip->taos_settings.als_gain;
 413
 414         /* set chip struct re scaling and saturation */
 415         chip->als_saturation = als_count * 922; /* 90% of full scale */
 416         chip->als_time_scale = (als_time + 25) / 50;
 417
 418         /* TSL258x Specific power-on / adc enable sequence
 419          * Power on the device 1st. */
 420         utmp = TSL258X_CNTL_PWR_ON;
 421         ret = i2c_smbus_write_byte_data(chip->client,
 422                                         TSL258X_CMD_REG | TSL258X_CNTRL, utmp);
 423         if (ret < 0) {
 424                 dev_err(&chip->client->dev, "taos_chip_on failed on CNTRL reg.\n");
 425                 return -1;
 426         }
 427
 428         /* Use the following shadow copy for our delay before enabling ADC.
 429          * Write all the registers. */
 430         for (i = 0, uP = chip->taos_config; i < TSL258X_REG_MAX; i++) {
 431                 ret = i2c_smbus_write_byte_data(chip->client,
 432                                                 TSL258X_CMD_REG + i,
 433                                                 *uP++);
 434                 if (ret < 0) {
 435                         dev_err(&chip->client->dev,
 436                                 "taos_chip_on failed on reg %d.\n", i);
 437                         return -1;
 438                 }
 439         }
 440
 441         msleep(3);
 442         /* NOW enable the ADC
 443          * initialize the desired mode of operation */
 444         utmp = TSL258X_CNTL_PWR_ON | TSL258X_CNTL_ADC_ENBL;
 445         ret = i2c_smbus_write_byte_data(chip->client,
 446                                         TSL258X_CMD_REG | TSL258X_CNTRL,
 447                                         utmp);
 448         if (ret < 0) {
 449                 dev_err(&chip->client->dev, "taos_chip_on failed on 2nd CTRL reg.\n");
 450                 return -1;
 451         }
 452         chip->taos_chip_status = TSL258X_CHIP_WORKING;
 453
 454         return ret;
 455 }
 456
 457 static int taos_chip_off(struct iio_dev *indio_dev)
 458 {
 459         struct tsl2583_chip *chip = iio_priv(indio_dev);
 460         int ret;
 461
 462         /* turn device off */
 463         chip->taos_chip_status = TSL258X_CHIP_SUSPENDED;
 464         ret = i2c_smbus_write_byte_data(chip->client,
 465                                         TSL258X_CMD_REG | TSL258X_CNTRL,
 466                                         0x00);
 467         return ret;
 468 }
 469
 470 /* Sysfs Interface Functions */
 471
 472 static ssize_t taos_power_state_show(struct device *dev,
 473         struct device_attribute *attr, char *buf)
 474 {
 475         struct iio_dev *indio_dev = dev_get_drvdata(dev);
 476         struct tsl2583_chip *chip = iio_priv(indio_dev);
 477
 478         return sprintf(buf, "%d\n", chip->taos_chip_status);
 479 }
 480
 481 static ssize_t taos_power_state_store(struct device *dev,
 482         struct device_attribute *attr, const char *buf, size_t len)
 483 {
 484         struct iio_dev *indio_dev = dev_get_drvdata(dev);
 485         unsigned long value;
 486
 487         if (strict_strtoul(buf, 0, &value))
 488                 return -EINVAL;
 489
 490         if (value == 0)
 491                 taos_chip_off(indio_dev);
 492         else
 493                 taos_chip_on(indio_dev);
 494
 495         return len;
 496 }
 497
 498 static ssize_t taos_gain_show(struct device *dev,
 499         struct device_attribute *attr, char *buf)
 500 {
 501         struct iio_dev *indio_dev = dev_get_drvdata(dev);
 502         struct tsl2583_chip *chip = iio_priv(indio_dev);
 503         char gain[4] = {0};
 504
 505         switch (chip->taos_settings.als_gain) {
 506         case 0:
 507                 strcpy(gain, "001");
 508                 break;
 509         case 1:
 510                 strcpy(gain, "008");
 511                 break;
 512         case 2:
 513                 strcpy(gain, "016");
 514                 break;
 515         case 3:
 516                 strcpy(gain, "111");
 517                 break;
 518         }
 519
 520         return sprintf(buf, "%s\n", gain);
 521 }
 522
 523 static ssize_t taos_gain_store(struct device *dev,
 524         struct device_attribute *attr, const char *buf, size_t len)
 525 {
 526         struct iio_dev *indio_dev = dev_get_drvdata(dev);
 527         struct tsl2583_chip *chip = iio_priv(indio_dev);
 528         unsigned long value;
 529
 530         if (strict_strtoul(buf, 0, &value))
 531                 return -EINVAL;
 532
 533         switch (value) {
 534         case 1:
 535                 chip->taos_settings.als_gain = 0;
 536                 break;
 537         case 8:
 538                 chip->taos_settings.als_gain = 1;
 539                 break;
 540         case 16:
 541                 chip->taos_settings.als_gain = 2;
 542                 break;
 543         case 111:
 544                 chip->taos_settings.als_gain = 3;
 545                 break;
 546         default:
 547                 dev_err(dev, "Invalid Gain Index (must be 1,8,16,111)\n");
 548                 return -1;
 549         }
 550
 551         return len;
 552 }
 553
 554 static ssize_t taos_gain_available_show(struct device *dev,
 555         struct device_attribute *attr, char *buf)
 556 {
 557         return sprintf(buf, "%s\n", "1 8 16 111");
 558 }
 559
 560 static ssize_t taos_als_time_show(struct device *dev,
 561         struct device_attribute *attr, char *buf)
 562 {
 563         struct iio_dev *indio_dev = dev_get_drvdata(dev);
 564         struct tsl2583_chip *chip = iio_priv(indio_dev);
 565
 566         return sprintf(buf, "%d\n", chip->taos_settings.als_time);
 567 }
 568
 569 static ssize_t taos_als_time_store(struct device *dev,
 570         struct device_attribute *attr, const char *buf, size_t len)
 571 {
 572         struct iio_dev *indio_dev = dev_get_drvdata(dev);
 573         struct tsl2583_chip *chip = iio_priv(indio_dev);
 574         unsigned long value;
 575
 576         if (strict_strtoul(buf, 0, &value))
 577                 return -EINVAL;
 578
 579         if ((value < 50) || (value > 650))
 580                 return -EINVAL;
 581
 582         if (value % 50)
 583                 return -EINVAL;
 584
 585         chip->taos_settings.als_time = value;
 586
 587         return len;
 588 }
 589
 590 static ssize_t taos_als_time_available_show(struct device *dev,
 591         struct device_attribute *attr, char *buf)
 592 {
 593         return sprintf(buf, "%s\n",
 594                 "50 100 150 200 250 300 350 400 450 500 550 600 650");
 595 }
 596
 597 static ssize_t taos_als_trim_show(struct device *dev,
 598         struct device_attribute *attr, char *buf)
 599 {
 600         struct iio_dev *indio_dev = dev_get_drvdata(dev);
 601         struct tsl2583_chip *chip = iio_priv(indio_dev);
 602
 603         return sprintf(buf, "%d\n", chip->taos_settings.als_gain_trim);
 604 }
 605
 606 static ssize_t taos_als_trim_store(struct device *dev,
 607         struct device_attribute *attr, const char *buf, size_t len)
 608 {
 609         struct iio_dev *indio_dev = dev_get_drvdata(dev);
 610         struct tsl2583_chip *chip = iio_priv(indio_dev);
 611         unsigned long value;
 612
 613         if (strict_strtoul(buf, 0, &value))
 614                 return -EINVAL;
 615
 616         if (value)
 617                 chip->taos_settings.als_gain_trim = value;
 618
 619         return len;
 620 }
 621
 622 static ssize_t taos_als_cal_target_show(struct device *dev,
 623         struct device_attribute *attr, char *buf)
 624 {
 625         struct iio_dev *indio_dev = dev_get_drvdata(dev);
 626         struct tsl2583_chip *chip = iio_priv(indio_dev);
 627
 628         return sprintf(buf, "%d\n", chip->taos_settings.als_cal_target);
 629 }
 630
 631 static ssize_t taos_als_cal_target_store(struct device *dev,
 632         struct device_attribute *attr, const char *buf, size_t len)
 633 {
 634         struct iio_dev *indio_dev = dev_get_drvdata(dev);
 635         struct tsl2583_chip *chip = iio_priv(indio_dev);
 636         unsigned long value;
 637
 638         if (strict_strtoul(buf, 0, &value))
 639                 return -EINVAL;
 640
 641         if (value)
 642                 chip->taos_settings.als_cal_target = value;
 643
 644         return len;
 645 }
 646
 647 static ssize_t taos_lux_show(struct device *dev, struct device_attribute *attr,
 648         char *buf)
 649 {
 650         int ret;
 651
 652         ret = taos_get_lux(dev_get_drvdata(dev));
 653         if (ret < 0)
 654                 return ret;
 655
 656         return sprintf(buf, "%d\n", ret);
 657 }
 658
 659 static ssize_t taos_do_calibrate(struct device *dev,
 660         struct device_attribute *attr, const char *buf, size_t len)
 661 {
 662         struct iio_dev *indio_dev = dev_get_drvdata(dev);
 663         unsigned long value;
 664
 665         if (strict_strtoul(buf, 0, &value))
 666                 return -EINVAL;
 667
 668         if (value == 1)
 669                 taos_als_calibrate(indio_dev);
 670
 671         return len;
 672 }
 673
 674 static ssize_t taos_luxtable_show(struct device *dev,
 675         struct device_attribute *attr, char *buf)
 676 {
 677         int i;
 678         int offset = 0;
 679
 680         for (i = 0; i < ARRAY_SIZE(taos_device_lux); i++) {
 681                 offset += sprintf(buf + offset, "%d,%d,%d,",
 682                                   taos_device_lux[i].ratio,
 683                                   taos_device_lux[i].ch0,
 684                                   taos_device_lux[i].ch1);
 685                 if (taos_device_lux[i].ratio == 0) {
 686                         /* We just printed the first "0" entry.
 687                          * Now get rid of the extra "," and break. */
 688                         offset--;
 689                         break;
 690                 }
 691         }
 692
 693         offset += sprintf(buf + offset, "\n");
 694         return offset;
 695 }
 696
 697 static ssize_t taos_luxtable_store(struct device *dev,
 698         struct device_attribute *attr, const char *buf, size_t len)
 699 {
 700         struct iio_dev *indio_dev = dev_get_drvdata(dev);
 701         struct tsl2583_chip *chip = iio_priv(indio_dev);
 702         int value[ARRAY_SIZE(taos_device_lux)*3 + 1];
 703         int n;
 704
 705         get_options(buf, ARRAY_SIZE(value), value);
 706
 707         /* We now have an array of ints starting at value[1], and
 708          * enumerated by value[0].
 709          * We expect each group of three ints is one table entry,
 710          * and the last table entry is all 0.
 711          */
 712         n = value[0];
 713         if ((n % 3) || n < 6 || n > ((ARRAY_SIZE(taos_device_lux) - 1) * 3)) {
 714                 dev_info(dev, "LUX TABLE INPUT ERROR 1 Value[0]=%d\n", n);
 715                 return -EINVAL;
 716         }
 717         if ((value[(n - 2)] | value[(n - 1)] | value[n]) != 0) {
 718                 dev_info(dev, "LUX TABLE INPUT ERROR 2 Value[0]=%d\n", n);
 719                 return -EINVAL;
 720         }
 721
 722         if (chip->taos_chip_status == TSL258X_CHIP_WORKING)
 723                 taos_chip_off(indio_dev);
 724
 725         /* Zero out the table */
 726         memset(taos_device_lux, 0, sizeof(taos_device_lux));
 727         memcpy(taos_device_lux, &value[1], (value[0] * 4));
 728
 729         taos_chip_on(indio_dev);
 730
 731         return len;
 732 }
 733
 734 static DEVICE_ATTR(power_state, S_IRUGO | S_IWUSR,
 735                 taos_power_state_show, taos_power_state_store);
 736
 737 static DEVICE_ATTR(illuminance0_calibscale, S_IRUGO | S_IWUSR,
 738                 taos_gain_show, taos_gain_store);
 739 static DEVICE_ATTR(illuminance0_calibscale_available, S_IRUGO,
 740                 taos_gain_available_show, NULL);
 741
 742 static DEVICE_ATTR(illuminance0_integration_time, S_IRUGO | S_IWUSR,
 743                 taos_als_time_show, taos_als_time_store);
 744 static DEVICE_ATTR(illuminance0_integration_time_available, S_IRUGO,
 745                 taos_als_time_available_show, NULL);
 746
 747 static DEVICE_ATTR(illuminance0_calibbias, S_IRUGO | S_IWUSR,
 748                 taos_als_trim_show, taos_als_trim_store);
 749
 750 static DEVICE_ATTR(illuminance0_input_target, S_IRUGO | S_IWUSR,
 751                 taos_als_cal_target_show, taos_als_cal_target_store);
 752
 753 static DEVICE_ATTR(illuminance0_input, S_IRUGO, taos_lux_show, NULL);
 754 static DEVICE_ATTR(illuminance0_calibrate, S_IWUSR, NULL, taos_do_calibrate);
 755 static DEVICE_ATTR(illuminance0_lux_table, S_IRUGO | S_IWUSR,
 756                 taos_luxtable_show, taos_luxtable_store);
 757
 758 static struct attribute *sysfs_attrs_ctrl[] = {
 759         &dev_attr_power_state.attr,
 760         &dev_attr_illuminance0_calibscale.attr,                 /* Gain  */
 761         &dev_attr_illuminance0_calibscale_available.attr,
 762         &dev_attr_illuminance0_integration_time.attr,   /* I time*/
 763         &dev_attr_illuminance0_integration_time_available.attr,
 764         &dev_attr_illuminance0_calibbias.attr,                  /* trim  */
 765         &dev_attr_illuminance0_input_target.attr,
 766         &dev_attr_illuminance0_input.attr,
 767         &dev_attr_illuminance0_calibrate.attr,
 768         &dev_attr_illuminance0_lux_table.attr,
 769         NULL
 770 };
 771
 772 static struct attribute_group tsl2583_attribute_group = {
 773         .attrs = sysfs_attrs_ctrl,
 774 };
 775
 776 /* Use the default register values to identify the Taos device */
 777 static int taos_tsl258x_device(unsigned char *bufp)
 778 {
 779         return ((bufp[TSL258X_CHIPID] & 0xf0) == 0x90);
 780 }
 781
 782 static const struct iio_info tsl2583_info = {
 783         .attrs = &tsl2583_attribute_group,
 784         .driver_module = THIS_MODULE,
 785 };
 786
 787 /*
 788  * Client probe function - When a valid device is found, the driver's device
 789  * data structure is updated, and initialization completes successfully.
 790  */
 791 static int __devinit taos_probe(struct i2c_client *clientp,
 792                       const struct i2c_device_id *idp)
 793 {
 794         int i, ret;
 795         unsigned char buf[TSL258X_MAX_DEVICE_REGS];
 796         struct tsl2583_chip *chip;
 797         struct iio_dev *indio_dev;
 798
 799         if (!i2c_check_functionality(clientp->adapter,
 800                 I2C_FUNC_SMBUS_BYTE_DATA)) {
 801                 dev_err(&clientp->dev,
 802                         "taos_probe() - i2c smbus byte data "
 803                         "functions unsupported\n");
 804                 return -EOPNOTSUPP;
 805         }
 806
 807         indio_dev = iio_allocate_device(sizeof(*chip));
 808         if (indio_dev == NULL) {
 809                 ret = -ENOMEM;
 810                 dev_err(&clientp->dev, "iio allocation failed\n");
 811                 goto fail1;
 812         }
 813         chip = iio_priv(indio_dev);
 814         chip->client = clientp;
 815         i2c_set_clientdata(clientp, indio_dev);
 816
 817         mutex_init(&chip->als_mutex);
 818         chip->taos_chip_status = TSL258X_CHIP_UNKNOWN;
 819         memcpy(chip->taos_config, taos_config, sizeof(chip->taos_config));
 820
 821         for (i = 0; i < TSL258X_MAX_DEVICE_REGS; i++) {
 822                 ret = i2c_smbus_write_byte(clientp,
 823                                 (TSL258X_CMD_REG | (TSL258X_CNTRL + i)));
 824                 if (ret < 0) {
 825                         dev_err(&clientp->dev, "i2c_smbus_write_bytes() to cmd "
 826                                 "reg failed in taos_probe(), err = %d\n", ret);
 827                         goto fail2;
 828                 }
 829                 ret = i2c_smbus_read_byte(clientp);
 830                 if (ret < 0) {
 831                         dev_err(&clientp->dev, "i2c_smbus_read_byte from "
 832                                 "reg failed in taos_probe(), err = %d\n", ret);
 833
 834                         goto fail2;
 835                 }
 836                 buf[i] = ret;
 837         }
 838
 839         if (!taos_tsl258x_device(buf)) {
 840                 dev_info(&clientp->dev, "i2c device found but does not match "
 841                         "expected id in taos_probe()\n");
 842                 goto fail2;
 843         }
 844
 845         ret = i2c_smbus_write_byte(clientp, (TSL258X_CMD_REG | TSL258X_CNTRL));
 846         if (ret < 0) {
 847                 dev_err(&clientp->dev, "i2c_smbus_write_byte() to cmd reg "
 848                         "failed in taos_probe(), err = %d\n", ret);
 849                 goto fail2;
 850         }
 851
 852         indio_dev->info = &tsl2583_info;
 853         indio_dev->dev.parent = &clientp->dev;
 854         indio_dev->modes = INDIO_DIRECT_MODE;
 855         indio_dev->name = chip->client->name;
 856         ret = iio_device_register(indio_dev);
 857         if (ret) {
 858                 dev_err(&clientp->dev, "iio registration failed\n");
 859                 goto fail2;
 860         }
 861
 862         /* Load up the V2 defaults (these are hard coded defaults for now) */
 863         taos_defaults(chip);
 864
 865         /* Make sure the chip is on */
 866         taos_chip_on(indio_dev);
 867
 868         dev_info(&clientp->dev, "Light sensor found.\n");
 869         return 0;
 870 fail1:
 871         iio_free_device(indio_dev);
 872 fail2:
 873         return ret;
 874 }
 875
 876 static int taos_suspend(struct i2c_client *client, pm_message_t state)
 877 {
 878         struct iio_dev *indio_dev = i2c_get_clientdata(client);
 879         struct tsl2583_chip *chip = iio_priv(indio_dev);
 880         int ret = 0;
 881
 882         mutex_lock(&chip->als_mutex);
 883
 884         if (chip->taos_chip_status == TSL258X_CHIP_WORKING) {
 885                 ret = taos_chip_off(indio_dev);
 886                 chip->taos_chip_status = TSL258X_CHIP_SUSPENDED;
 887         }
 888
 889         mutex_unlock(&chip->als_mutex);
 890         return ret;
 891 }
 892
 893 static int taos_resume(struct i2c_client *client)
 894 {
 895         struct iio_dev *indio_dev = i2c_get_clientdata(client);
 896         struct tsl2583_chip *chip = iio_priv(indio_dev);
 897         int ret = 0;
 898
 899         mutex_lock(&chip->als_mutex);
 900
 901         if (chip->taos_chip_status == TSL258X_CHIP_SUSPENDED)
 902                 ret = taos_chip_on(indio_dev);
 903
 904         mutex_unlock(&chip->als_mutex);
 905         return ret;
 906 }
 907
 908
 909 static int __devexit taos_remove(struct i2c_client *client)
 910 {
 911         iio_device_unregister(i2c_get_clientdata(client));
 912         iio_free_device(i2c_get_clientdata(client));
 913
 914         return 0;
 915 }
 916
 917 static struct i2c_device_id taos_idtable[] = {
 918         { "tsl2580", 0 },
 919         { "tsl2581", 1 },
 920         { "tsl2583", 2 },
 921         {}
 922 };
 923 MODULE_DEVICE_TABLE(i2c, taos_idtable);
 924
 925 /* Driver definition */
 926 static struct i2c_driver taos_driver = {
 927         .driver = {
 928                 .name = "tsl2583",
 929         },
 930         .id_table = taos_idtable,
 931         .suspend        = taos_suspend,
 932         .resume         = taos_resume,
 933         .probe = taos_probe,
 934         .remove = __devexit_p(taos_remove),
 935 };
 936
 937 static int __init taos_init(void)
 938 {
 939         return i2c_add_driver(&taos_driver);
 940 }
 941
 942 static void __exit taos_exit(void)
 943 {
 944         i2c_del_driver(&taos_driver);
 945 }
 946
 947 module_init(taos_init);
 948 module_exit(taos_exit);
 949
 950 MODULE_AUTHOR("J. August Brenner<jbrenner@taosinc.com>");
 951 MODULE_DESCRIPTION("TAOS tsl2583 ambient light sensor driver");
 952 MODULE_LICENSE("GPL");