Loading...
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 950 951 952 | /*
* Device driver for monitoring ambient light intensity (lux)
* within the TAOS tsl258x family of devices (tsl2580, tsl2581).
*
* Copyright (c) 2011, TAOS Corporation.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
* more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
#include <linux/kernel.h>
#include <linux/i2c.h>
#include <linux/errno.h>
#include <linux/delay.h>
#include <linux/string.h>
#include <linux/mutex.h>
#include <linux/unistd.h>
#include <linux/slab.h>
#include <linux/module.h>
#include "../iio.h"
#define TSL258X_MAX_DEVICE_REGS 32
/* Triton register offsets */
#define TSL258X_REG_MAX 8
/* Device Registers and Masks */
#define TSL258X_CNTRL 0x00
#define TSL258X_ALS_TIME 0X01
#define TSL258X_INTERRUPT 0x02
#define TSL258X_GAIN 0x07
#define TSL258X_REVID 0x11
#define TSL258X_CHIPID 0x12
#define TSL258X_ALS_CHAN0LO 0x14
#define TSL258X_ALS_CHAN0HI 0x15
#define TSL258X_ALS_CHAN1LO 0x16
#define TSL258X_ALS_CHAN1HI 0x17
#define TSL258X_TMR_LO 0x18
#define TSL258X_TMR_HI 0x19
/* tsl2583 cmd reg masks */
#define TSL258X_CMD_REG 0x80
#define TSL258X_CMD_SPL_FN 0x60
#define TSL258X_CMD_ALS_INT_CLR 0X01
/* tsl2583 cntrl reg masks */
#define TSL258X_CNTL_ADC_ENBL 0x02
#define TSL258X_CNTL_PWR_ON 0x01
/* tsl2583 status reg masks */
#define TSL258X_STA_ADC_VALID 0x01
#define TSL258X_STA_ADC_INTR 0x10
/* Lux calculation constants */
#define TSL258X_LUX_CALC_OVER_FLOW 65535
enum {
TSL258X_CHIP_UNKNOWN = 0,
TSL258X_CHIP_WORKING = 1,
TSL258X_CHIP_SUSPENDED = 2
};
/* Per-device data */
struct taos_als_info {
u16 als_ch0;
u16 als_ch1;
u16 lux;
};
struct taos_settings {
int als_time;
int als_gain;
int als_gain_trim;
int als_cal_target;
};
struct tsl2583_chip {
struct mutex als_mutex;
struct i2c_client *client;
struct taos_als_info als_cur_info;
struct taos_settings taos_settings;
int als_time_scale;
int als_saturation;
int taos_chip_status;
u8 taos_config[8];
};
/*
* Initial values for device - this values can/will be changed by driver.
* and applications as needed.
* These values are dynamic.
*/
static const u8 taos_config[8] = {
0x00, 0xee, 0x00, 0x03, 0x00, 0xFF, 0xFF, 0x00
}; /* cntrl atime intC Athl0 Athl1 Athh0 Athh1 gain */
struct taos_lux {
unsigned int ratio;
unsigned int ch0;
unsigned int ch1;
};
/* This structure is intentionally large to accommodate updates via sysfs. */
/* Sized to 11 = max 10 segments + 1 termination segment */
/* Assumption is is one and only one type of glass used */
static struct taos_lux taos_device_lux[11] = {
{ 9830, 8520, 15729 },
{ 12452, 10807, 23344 },
{ 14746, 6383, 11705 },
{ 17695, 4063, 6554 },
};
struct gainadj {
s16 ch0;
s16 ch1;
};
/* Index = (0 - 3) Used to validate the gain selection index */
static const struct gainadj gainadj[] = {
{ 1, 1 },
{ 8, 8 },
{ 16, 16 },
{ 107, 115 }
};
/*
* Provides initial operational parameter defaults.
* These defaults may be changed through the device's sysfs files.
*/
static void taos_defaults(struct tsl2583_chip *chip)
{
/* Operational parameters */
chip->taos_settings.als_time = 100;
/* must be a multiple of 50mS */
chip->taos_settings.als_gain = 0;
/* this is actually an index into the gain table */
/* assume clear glass as default */
chip->taos_settings.als_gain_trim = 1000;
/* default gain trim to account for aperture effects */
chip->taos_settings.als_cal_target = 130;
/* Known external ALS reading used for calibration */
}
/*
* Read a number of bytes starting at register (reg) location.
* Return 0, or i2c_smbus_write_byte ERROR code.
*/
static int
taos_i2c_read(struct i2c_client *client, u8 reg, u8 *val, unsigned int len)
{
int i, ret;
for (i = 0; i < len; i++) {
/* select register to write */
ret = i2c_smbus_write_byte(client, (TSL258X_CMD_REG | reg));
if (ret < 0) {
dev_err(&client->dev, "taos_i2c_read failed to write"
" register %x\n", reg);
return ret;
}
/* read the data */
*val = i2c_smbus_read_byte(client);
val++;
reg++;
}
return 0;
}
/*
* Reads and calculates current lux value.
* The raw ch0 and ch1 values of the ambient light sensed in the last
* integration cycle are read from the device.
* Time scale factor array values are adjusted based on the integration time.
* The raw values are multiplied by a scale factor, and device gain is obtained
* using gain index. Limit checks are done next, then the ratio of a multiple
* of ch1 value, to the ch0 value, is calculated. The array taos_device_lux[]
* declared above is then scanned to find the first ratio value that is just
* above the ratio we just calculated. The ch0 and ch1 multiplier constants in
* the array are then used along with the time scale factor array values, to
* calculate the lux.
*/
static int taos_get_lux(struct iio_dev *indio_dev)
{
u16 ch0, ch1; /* separated ch0/ch1 data from device */
u32 lux; /* raw lux calculated from device data */
u32 ratio;
u8 buf[5];
struct taos_lux *p;
struct tsl2583_chip *chip = iio_priv(indio_dev);
int i, ret;
u32 ch0lux = 0;
u32 ch1lux = 0;
if (mutex_trylock(&chip->als_mutex) == 0) {
dev_info(&chip->client->dev, "taos_get_lux device is busy\n");
return chip->als_cur_info.lux; /* busy, so return LAST VALUE */
}
if (chip->taos_chip_status != TSL258X_CHIP_WORKING) {
/* device is not enabled */
dev_err(&chip->client->dev, "taos_get_lux device is not enabled\n");
ret = -EBUSY ;
goto out_unlock;
}
ret = taos_i2c_read(chip->client, (TSL258X_CMD_REG), &buf[0], 1);
if (ret < 0) {
dev_err(&chip->client->dev, "taos_get_lux failed to read CMD_REG\n");
goto out_unlock;
}
/* is data new & valid */
if (!(buf[0] & TSL258X_STA_ADC_INTR)) {
dev_err(&chip->client->dev, "taos_get_lux data not valid\n");
ret = chip->als_cur_info.lux; /* return LAST VALUE */
goto out_unlock;
}
for (i = 0; i < 4; i++) {
int reg = TSL258X_CMD_REG | (TSL258X_ALS_CHAN0LO + i);
ret = taos_i2c_read(chip->client, reg, &buf[i], 1);
if (ret < 0) {
dev_err(&chip->client->dev, "taos_get_lux failed to read"
" register %x\n", reg);
goto out_unlock;
}
}
/* clear status, really interrupt status (interrupts are off), but
* we use the bit anyway - don't forget 0x80 - this is a command*/
ret = i2c_smbus_write_byte(chip->client,
(TSL258X_CMD_REG | TSL258X_CMD_SPL_FN |
TSL258X_CMD_ALS_INT_CLR));
if (ret < 0) {
dev_err(&chip->client->dev,
"taos_i2c_write_command failed in taos_get_lux, err = %d\n",
ret);
goto out_unlock; /* have no data, so return failure */
}
/* extract ALS/lux data */
ch0 = le16_to_cpup((const __le16 *)&buf[0]);
ch1 = le16_to_cpup((const __le16 *)&buf[2]);
chip->als_cur_info.als_ch0 = ch0;
chip->als_cur_info.als_ch1 = ch1;
if ((ch0 >= chip->als_saturation) || (ch1 >= chip->als_saturation))
goto return_max;
if (ch0 == 0) {
/* have no data, so return LAST VALUE */
ret = chip->als_cur_info.lux = 0;
goto out_unlock;
}
/* calculate ratio */
ratio = (ch1 << 15) / ch0;
/* convert to unscaled lux using the pointer to the table */
for (p = (struct taos_lux *) taos_device_lux;
p->ratio != 0 && p->ratio < ratio; p++)
;
if (p->ratio == 0) {
lux = 0;
} else {
ch0lux = ((ch0 * p->ch0) +
(gainadj[chip->taos_settings.als_gain].ch0 >> 1))
/ gainadj[chip->taos_settings.als_gain].ch0;
ch1lux = ((ch1 * p->ch1) +
(gainadj[chip->taos_settings.als_gain].ch1 >> 1))
/ gainadj[chip->taos_settings.als_gain].ch1;
lux = ch0lux - ch1lux;
}
/* note: lux is 31 bit max at this point */
if (ch1lux > ch0lux) {
dev_dbg(&chip->client->dev, "No Data - Return last value\n");
ret = chip->als_cur_info.lux = 0;
goto out_unlock;
}
/* adjust for active time scale */
if (chip->als_time_scale == 0)
lux = 0;
else
lux = (lux + (chip->als_time_scale >> 1)) /
chip->als_time_scale;
/* adjust for active gain scale */
lux >>= 13; /* tables have factor of 8192 builtin for accuracy */
lux = (lux * chip->taos_settings.als_gain_trim + 500) / 1000;
if (lux > TSL258X_LUX_CALC_OVER_FLOW) { /* check for overflow */
return_max:
lux = TSL258X_LUX_CALC_OVER_FLOW;
}
/* Update the structure with the latest VALID lux. */
chip->als_cur_info.lux = lux;
ret = lux;
out_unlock:
mutex_unlock(&chip->als_mutex);
return ret;
}
/*
* Obtain single reading and calculate the als_gain_trim (later used
* to derive actual lux).
* Return updated gain_trim value.
*/
static int taos_als_calibrate(struct iio_dev *indio_dev)
{
struct tsl2583_chip *chip = iio_priv(indio_dev);
u8 reg_val;
unsigned int gain_trim_val;
int ret;
int lux_val;
ret = i2c_smbus_write_byte(chip->client,
(TSL258X_CMD_REG | TSL258X_CNTRL));
if (ret < 0) {
dev_err(&chip->client->dev,
"taos_als_calibrate failed to reach the CNTRL register, ret=%d\n",
ret);
return ret;
}
reg_val = i2c_smbus_read_byte(chip->client);
if ((reg_val & (TSL258X_CNTL_ADC_ENBL | TSL258X_CNTL_PWR_ON))
!= (TSL258X_CNTL_ADC_ENBL | TSL258X_CNTL_PWR_ON)) {
dev_err(&chip->client->dev,
"taos_als_calibrate failed: device not powered on with ADC enabled\n");
return -1;
}
ret = i2c_smbus_write_byte(chip->client,
(TSL258X_CMD_REG | TSL258X_CNTRL));
if (ret < 0) {
dev_err(&chip->client->dev,
"taos_als_calibrate failed to reach the STATUS register, ret=%d\n",
ret);
return ret;
}
reg_val = i2c_smbus_read_byte(chip->client);
if ((reg_val & TSL258X_STA_ADC_VALID) != TSL258X_STA_ADC_VALID) {
dev_err(&chip->client->dev,
"taos_als_calibrate failed: STATUS - ADC not valid.\n");
return -ENODATA;
}
lux_val = taos_get_lux(indio_dev);
if (lux_val < 0) {
dev_err(&chip->client->dev, "taos_als_calibrate failed to get lux\n");
return lux_val;
}
gain_trim_val = (unsigned int) (((chip->taos_settings.als_cal_target)
* chip->taos_settings.als_gain_trim) / lux_val);
if ((gain_trim_val < 250) || (gain_trim_val > 4000)) {
dev_err(&chip->client->dev,
"taos_als_calibrate failed: trim_val of %d is out of range\n",
gain_trim_val);
return -ENODATA;
}
chip->taos_settings.als_gain_trim = (int) gain_trim_val;
return (int) gain_trim_val;
}
/*
* Turn the device on.
* Configuration must be set before calling this function.
*/
static int taos_chip_on(struct iio_dev *indio_dev)
{
int i;
int ret;
u8 *uP;
u8 utmp;
int als_count;
int als_time;
struct tsl2583_chip *chip = iio_priv(indio_dev);
/* and make sure we're not already on */
if (chip->taos_chip_status == TSL258X_CHIP_WORKING) {
/* if forcing a register update - turn off, then on */
dev_info(&chip->client->dev, "device is already enabled\n");
return -EINVAL;
}
/* determine als integration regster */
als_count = (chip->taos_settings.als_time * 100 + 135) / 270;
if (als_count == 0)
als_count = 1; /* ensure at least one cycle */
/* convert back to time (encompasses overrides) */
als_time = (als_count * 27 + 5) / 10;
chip->taos_config[TSL258X_ALS_TIME] = 256 - als_count;
/* Set the gain based on taos_settings struct */
chip->taos_config[TSL258X_GAIN] = chip->taos_settings.als_gain;
/* set chip struct re scaling and saturation */
chip->als_saturation = als_count * 922; /* 90% of full scale */
chip->als_time_scale = (als_time + 25) / 50;
/* TSL258x Specific power-on / adc enable sequence
* Power on the device 1st. */
utmp = TSL258X_CNTL_PWR_ON;
ret = i2c_smbus_write_byte_data(chip->client,
TSL258X_CMD_REG | TSL258X_CNTRL, utmp);
if (ret < 0) {
dev_err(&chip->client->dev, "taos_chip_on failed on CNTRL reg.\n");
return -1;
}
/* Use the following shadow copy for our delay before enabling ADC.
* Write all the registers. */
for (i = 0, uP = chip->taos_config; i < TSL258X_REG_MAX; i++) {
ret = i2c_smbus_write_byte_data(chip->client,
TSL258X_CMD_REG + i,
*uP++);
if (ret < 0) {
dev_err(&chip->client->dev,
"taos_chip_on failed on reg %d.\n", i);
return -1;
}
}
msleep(3);
/* NOW enable the ADC
* initialize the desired mode of operation */
utmp = TSL258X_CNTL_PWR_ON | TSL258X_CNTL_ADC_ENBL;
ret = i2c_smbus_write_byte_data(chip->client,
TSL258X_CMD_REG | TSL258X_CNTRL,
utmp);
if (ret < 0) {
dev_err(&chip->client->dev, "taos_chip_on failed on 2nd CTRL reg.\n");
return -1;
}
chip->taos_chip_status = TSL258X_CHIP_WORKING;
return ret;
}
static int taos_chip_off(struct iio_dev *indio_dev)
{
struct tsl2583_chip *chip = iio_priv(indio_dev);
int ret;
/* turn device off */
chip->taos_chip_status = TSL258X_CHIP_SUSPENDED;
ret = i2c_smbus_write_byte_data(chip->client,
TSL258X_CMD_REG | TSL258X_CNTRL,
0x00);
return ret;
}
/* Sysfs Interface Functions */
static ssize_t taos_power_state_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct iio_dev *indio_dev = dev_get_drvdata(dev);
struct tsl2583_chip *chip = iio_priv(indio_dev);
return sprintf(buf, "%d\n", chip->taos_chip_status);
}
static ssize_t taos_power_state_store(struct device *dev,
struct device_attribute *attr, const char *buf, size_t len)
{
struct iio_dev *indio_dev = dev_get_drvdata(dev);
unsigned long value;
if (strict_strtoul(buf, 0, &value))
return -EINVAL;
if (value == 0)
taos_chip_off(indio_dev);
else
taos_chip_on(indio_dev);
return len;
}
static ssize_t taos_gain_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct iio_dev *indio_dev = dev_get_drvdata(dev);
struct tsl2583_chip *chip = iio_priv(indio_dev);
char gain[4] = {0};
switch (chip->taos_settings.als_gain) {
case 0:
strcpy(gain, "001");
break;
case 1:
strcpy(gain, "008");
break;
case 2:
strcpy(gain, "016");
break;
case 3:
strcpy(gain, "111");
break;
}
return sprintf(buf, "%s\n", gain);
}
static ssize_t taos_gain_store(struct device *dev,
struct device_attribute *attr, const char *buf, size_t len)
{
struct iio_dev *indio_dev = dev_get_drvdata(dev);
struct tsl2583_chip *chip = iio_priv(indio_dev);
unsigned long value;
if (strict_strtoul(buf, 0, &value))
return -EINVAL;
switch (value) {
case 1:
chip->taos_settings.als_gain = 0;
break;
case 8:
chip->taos_settings.als_gain = 1;
break;
case 16:
chip->taos_settings.als_gain = 2;
break;
case 111:
chip->taos_settings.als_gain = 3;
break;
default:
dev_err(dev, "Invalid Gain Index (must be 1,8,16,111)\n");
return -1;
}
return len;
}
static ssize_t taos_gain_available_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
return sprintf(buf, "%s\n", "1 8 16 111");
}
static ssize_t taos_als_time_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct iio_dev *indio_dev = dev_get_drvdata(dev);
struct tsl2583_chip *chip = iio_priv(indio_dev);
return sprintf(buf, "%d\n", chip->taos_settings.als_time);
}
static ssize_t taos_als_time_store(struct device *dev,
struct device_attribute *attr, const char *buf, size_t len)
{
struct iio_dev *indio_dev = dev_get_drvdata(dev);
struct tsl2583_chip *chip = iio_priv(indio_dev);
unsigned long value;
if (strict_strtoul(buf, 0, &value))
return -EINVAL;
if ((value < 50) || (value > 650))
return -EINVAL;
if (value % 50)
return -EINVAL;
chip->taos_settings.als_time = value;
return len;
}
static ssize_t taos_als_time_available_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
return sprintf(buf, "%s\n",
"50 100 150 200 250 300 350 400 450 500 550 600 650");
}
static ssize_t taos_als_trim_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct iio_dev *indio_dev = dev_get_drvdata(dev);
struct tsl2583_chip *chip = iio_priv(indio_dev);
return sprintf(buf, "%d\n", chip->taos_settings.als_gain_trim);
}
static ssize_t taos_als_trim_store(struct device *dev,
struct device_attribute *attr, const char *buf, size_t len)
{
struct iio_dev *indio_dev = dev_get_drvdata(dev);
struct tsl2583_chip *chip = iio_priv(indio_dev);
unsigned long value;
if (strict_strtoul(buf, 0, &value))
return -EINVAL;
if (value)
chip->taos_settings.als_gain_trim = value;
return len;
}
static ssize_t taos_als_cal_target_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct iio_dev *indio_dev = dev_get_drvdata(dev);
struct tsl2583_chip *chip = iio_priv(indio_dev);
return sprintf(buf, "%d\n", chip->taos_settings.als_cal_target);
}
static ssize_t taos_als_cal_target_store(struct device *dev,
struct device_attribute *attr, const char *buf, size_t len)
{
struct iio_dev *indio_dev = dev_get_drvdata(dev);
struct tsl2583_chip *chip = iio_priv(indio_dev);
unsigned long value;
if (strict_strtoul(buf, 0, &value))
return -EINVAL;
if (value)
chip->taos_settings.als_cal_target = value;
return len;
}
static ssize_t taos_lux_show(struct device *dev, struct device_attribute *attr,
char *buf)
{
int ret;
ret = taos_get_lux(dev_get_drvdata(dev));
if (ret < 0)
return ret;
return sprintf(buf, "%d\n", ret);
}
static ssize_t taos_do_calibrate(struct device *dev,
struct device_attribute *attr, const char *buf, size_t len)
{
struct iio_dev *indio_dev = dev_get_drvdata(dev);
unsigned long value;
if (strict_strtoul(buf, 0, &value))
return -EINVAL;
if (value == 1)
taos_als_calibrate(indio_dev);
return len;
}
static ssize_t taos_luxtable_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
int i;
int offset = 0;
for (i = 0; i < ARRAY_SIZE(taos_device_lux); i++) {
offset += sprintf(buf + offset, "%d,%d,%d,",
taos_device_lux[i].ratio,
taos_device_lux[i].ch0,
taos_device_lux[i].ch1);
if (taos_device_lux[i].ratio == 0) {
/* We just printed the first "0" entry.
* Now get rid of the extra "," and break. */
offset--;
break;
}
}
offset += sprintf(buf + offset, "\n");
return offset;
}
static ssize_t taos_luxtable_store(struct device *dev,
struct device_attribute *attr, const char *buf, size_t len)
{
struct iio_dev *indio_dev = dev_get_drvdata(dev);
struct tsl2583_chip *chip = iio_priv(indio_dev);
int value[ARRAY_SIZE(taos_device_lux)*3 + 1];
int n;
get_options(buf, ARRAY_SIZE(value), value);
/* We now have an array of ints starting at value[1], and
* enumerated by value[0].
* We expect each group of three ints is one table entry,
* and the last table entry is all 0.
*/
n = value[0];
if ((n % 3) || n < 6 || n > ((ARRAY_SIZE(taos_device_lux) - 1) * 3)) {
dev_info(dev, "LUX TABLE INPUT ERROR 1 Value[0]=%d\n", n);
return -EINVAL;
}
if ((value[(n - 2)] | value[(n - 1)] | value[n]) != 0) {
dev_info(dev, "LUX TABLE INPUT ERROR 2 Value[0]=%d\n", n);
return -EINVAL;
}
if (chip->taos_chip_status == TSL258X_CHIP_WORKING)
taos_chip_off(indio_dev);
/* Zero out the table */
memset(taos_device_lux, 0, sizeof(taos_device_lux));
memcpy(taos_device_lux, &value[1], (value[0] * 4));
taos_chip_on(indio_dev);
return len;
}
static DEVICE_ATTR(power_state, S_IRUGO | S_IWUSR,
taos_power_state_show, taos_power_state_store);
static DEVICE_ATTR(illuminance0_calibscale, S_IRUGO | S_IWUSR,
taos_gain_show, taos_gain_store);
static DEVICE_ATTR(illuminance0_calibscale_available, S_IRUGO,
taos_gain_available_show, NULL);
static DEVICE_ATTR(illuminance0_integration_time, S_IRUGO | S_IWUSR,
taos_als_time_show, taos_als_time_store);
static DEVICE_ATTR(illuminance0_integration_time_available, S_IRUGO,
taos_als_time_available_show, NULL);
static DEVICE_ATTR(illuminance0_calibbias, S_IRUGO | S_IWUSR,
taos_als_trim_show, taos_als_trim_store);
static DEVICE_ATTR(illuminance0_input_target, S_IRUGO | S_IWUSR,
taos_als_cal_target_show, taos_als_cal_target_store);
static DEVICE_ATTR(illuminance0_input, S_IRUGO, taos_lux_show, NULL);
static DEVICE_ATTR(illuminance0_calibrate, S_IWUSR, NULL, taos_do_calibrate);
static DEVICE_ATTR(illuminance0_lux_table, S_IRUGO | S_IWUSR,
taos_luxtable_show, taos_luxtable_store);
static struct attribute *sysfs_attrs_ctrl[] = {
&dev_attr_power_state.attr,
&dev_attr_illuminance0_calibscale.attr, /* Gain */
&dev_attr_illuminance0_calibscale_available.attr,
&dev_attr_illuminance0_integration_time.attr, /* I time*/
&dev_attr_illuminance0_integration_time_available.attr,
&dev_attr_illuminance0_calibbias.attr, /* trim */
&dev_attr_illuminance0_input_target.attr,
&dev_attr_illuminance0_input.attr,
&dev_attr_illuminance0_calibrate.attr,
&dev_attr_illuminance0_lux_table.attr,
NULL
};
static struct attribute_group tsl2583_attribute_group = {
.attrs = sysfs_attrs_ctrl,
};
/* Use the default register values to identify the Taos device */
static int taos_tsl258x_device(unsigned char *bufp)
{
return ((bufp[TSL258X_CHIPID] & 0xf0) == 0x90);
}
static const struct iio_info tsl2583_info = {
.attrs = &tsl2583_attribute_group,
.driver_module = THIS_MODULE,
};
/*
* Client probe function - When a valid device is found, the driver's device
* data structure is updated, and initialization completes successfully.
*/
static int __devinit taos_probe(struct i2c_client *clientp,
const struct i2c_device_id *idp)
{
int i, ret;
unsigned char buf[TSL258X_MAX_DEVICE_REGS];
struct tsl2583_chip *chip;
struct iio_dev *indio_dev;
if (!i2c_check_functionality(clientp->adapter,
I2C_FUNC_SMBUS_BYTE_DATA)) {
dev_err(&clientp->dev,
"taos_probe() - i2c smbus byte data "
"functions unsupported\n");
return -EOPNOTSUPP;
}
indio_dev = iio_allocate_device(sizeof(*chip));
if (indio_dev == NULL) {
ret = -ENOMEM;
dev_err(&clientp->dev, "iio allocation failed\n");
goto fail1;
}
chip = iio_priv(indio_dev);
chip->client = clientp;
i2c_set_clientdata(clientp, indio_dev);
mutex_init(&chip->als_mutex);
chip->taos_chip_status = TSL258X_CHIP_UNKNOWN;
memcpy(chip->taos_config, taos_config, sizeof(chip->taos_config));
for (i = 0; i < TSL258X_MAX_DEVICE_REGS; i++) {
ret = i2c_smbus_write_byte(clientp,
(TSL258X_CMD_REG | (TSL258X_CNTRL + i)));
if (ret < 0) {
dev_err(&clientp->dev, "i2c_smbus_write_bytes() to cmd "
"reg failed in taos_probe(), err = %d\n", ret);
goto fail2;
}
ret = i2c_smbus_read_byte(clientp);
if (ret < 0) {
dev_err(&clientp->dev, "i2c_smbus_read_byte from "
"reg failed in taos_probe(), err = %d\n", ret);
goto fail2;
}
buf[i] = ret;
}
if (!taos_tsl258x_device(buf)) {
dev_info(&clientp->dev, "i2c device found but does not match "
"expected id in taos_probe()\n");
goto fail2;
}
ret = i2c_smbus_write_byte(clientp, (TSL258X_CMD_REG | TSL258X_CNTRL));
if (ret < 0) {
dev_err(&clientp->dev, "i2c_smbus_write_byte() to cmd reg "
"failed in taos_probe(), err = %d\n", ret);
goto fail2;
}
indio_dev->info = &tsl2583_info;
indio_dev->dev.parent = &clientp->dev;
indio_dev->modes = INDIO_DIRECT_MODE;
indio_dev->name = chip->client->name;
ret = iio_device_register(indio_dev);
if (ret) {
dev_err(&clientp->dev, "iio registration failed\n");
goto fail2;
}
/* Load up the V2 defaults (these are hard coded defaults for now) */
taos_defaults(chip);
/* Make sure the chip is on */
taos_chip_on(indio_dev);
dev_info(&clientp->dev, "Light sensor found.\n");
return 0;
fail1:
iio_free_device(indio_dev);
fail2:
return ret;
}
static int taos_suspend(struct i2c_client *client, pm_message_t state)
{
struct iio_dev *indio_dev = i2c_get_clientdata(client);
struct tsl2583_chip *chip = iio_priv(indio_dev);
int ret = 0;
mutex_lock(&chip->als_mutex);
if (chip->taos_chip_status == TSL258X_CHIP_WORKING) {
ret = taos_chip_off(indio_dev);
chip->taos_chip_status = TSL258X_CHIP_SUSPENDED;
}
mutex_unlock(&chip->als_mutex);
return ret;
}
static int taos_resume(struct i2c_client *client)
{
struct iio_dev *indio_dev = i2c_get_clientdata(client);
struct tsl2583_chip *chip = iio_priv(indio_dev);
int ret = 0;
mutex_lock(&chip->als_mutex);
if (chip->taos_chip_status == TSL258X_CHIP_SUSPENDED)
ret = taos_chip_on(indio_dev);
mutex_unlock(&chip->als_mutex);
return ret;
}
static int __devexit taos_remove(struct i2c_client *client)
{
iio_device_unregister(i2c_get_clientdata(client));
iio_free_device(i2c_get_clientdata(client));
return 0;
}
static struct i2c_device_id taos_idtable[] = {
{ "tsl2580", 0 },
{ "tsl2581", 1 },
{ "tsl2583", 2 },
{}
};
MODULE_DEVICE_TABLE(i2c, taos_idtable);
/* Driver definition */
static struct i2c_driver taos_driver = {
.driver = {
.name = "tsl2583",
},
.id_table = taos_idtable,
.suspend = taos_suspend,
.resume = taos_resume,
.probe = taos_probe,
.remove = __devexit_p(taos_remove),
};
static int __init taos_init(void)
{
return i2c_add_driver(&taos_driver);
}
static void __exit taos_exit(void)
{
i2c_del_driver(&taos_driver);
}
module_init(taos_init);
module_exit(taos_exit);
MODULE_AUTHOR("J. August Brenner<jbrenner@taosinc.com>");
MODULE_DESCRIPTION("TAOS tsl2583 ambient light sensor driver");
MODULE_LICENSE("GPL");
|