2 * Device driver for monitoring ambient light intensity (lux)
3 * within the TAOS tsl258x family of devices (tsl2580, tsl2581).
5 * Copyright (c) 2011, TAOS Corporation.
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.
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
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.
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>
33 #define TSL258X_MAX_DEVICE_REGS 32
35 /* Triton register offsets */
36 #define TSL258X_REG_MAX 8
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
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
57 /* tsl2583 cntrl reg masks */
58 #define TSL258X_CNTL_ADC_ENBL 0x02
59 #define TSL258X_CNTL_PWR_ON 0x01
61 /* tsl2583 status reg masks */
62 #define TSL258X_STA_ADC_VALID 0x01
63 #define TSL258X_STA_ADC_INTR 0x10
65 /* Lux calculation constants */
66 #define TSL258X_LUX_CALC_OVER_FLOW 65535
69 TSL258X_CHIP_UNKNOWN = 0,
70 TSL258X_CHIP_WORKING = 1,
71 TSL258X_CHIP_SUSPENDED = 2
75 struct taos_als_info {
81 struct taos_settings {
89 struct mutex als_mutex;
90 struct i2c_client *client;
91 struct taos_als_info als_cur_info;
92 struct taos_settings taos_settings;
100 * Initial values for device - this values can/will be changed by driver.
101 * and applications as needed.
102 * These values are dynamic.
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 */
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 },
129 /* Index = (0 - 3) Used to validate the gain selection index */
130 static const struct gainadj gainadj[] = {
138 * Provides initial operational parameter defaults.
139 * These defaults may be changed through the device's sysfs files.
141 static void taos_defaults(struct tsl2583_chip *chip)
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 */
156 * Read a number of bytes starting at register (reg) location.
157 * Return 0, or i2c_smbus_write_byte ERROR code.
160 taos_i2c_read(struct i2c_client *client, u8 reg, u8 *val, unsigned int len)
164 for (i = 0; i < len; i++) {
165 /* select register to write */
166 ret = i2c_smbus_write_byte(client, (TSL258X_CMD_REG | reg));
168 dev_err(&client->dev,
169 "taos_i2c_read failed to write register %x\n",
174 ret = i2c_smbus_read_byte(client);
176 dev_err(&client->dev,
177 "%s failed to read byte after writing to register %x\n",
189 * Reads and calculates current lux value.
190 * The raw ch0 and ch1 values of the ambient light sensed in the last
191 * integration cycle are read from the device.
192 * Time scale factor array values are adjusted based on the integration time.
193 * The raw values are multiplied by a scale factor, and device gain is obtained
194 * using gain index. Limit checks are done next, then the ratio of a multiple
195 * of ch1 value, to the ch0 value, is calculated. The array taos_device_lux[]
196 * declared above is then scanned to find the first ratio value that is just
197 * above the ratio we just calculated. The ch0 and ch1 multiplier constants in
198 * the array are then used along with the time scale factor array values, to
201 static int taos_get_lux(struct iio_dev *indio_dev)
203 u16 ch0, ch1; /* separated ch0/ch1 data from device */
204 u32 lux; /* raw lux calculated from device data */
209 struct tsl2583_chip *chip = iio_priv(indio_dev);
214 if (mutex_trylock(&chip->als_mutex) == 0) {
215 dev_info(&chip->client->dev, "taos_get_lux device is busy\n");
216 return chip->als_cur_info.lux; /* busy, so return LAST VALUE */
219 if (chip->taos_chip_status != TSL258X_CHIP_WORKING) {
220 /* device is not enabled */
221 dev_err(&chip->client->dev, "taos_get_lux device is not enabled\n");
226 ret = taos_i2c_read(chip->client, (TSL258X_CMD_REG), &buf[0], 1);
228 dev_err(&chip->client->dev, "taos_get_lux failed to read CMD_REG\n");
231 /* is data new & valid */
232 if (!(buf[0] & TSL258X_STA_ADC_INTR)) {
233 dev_err(&chip->client->dev, "taos_get_lux data not valid\n");
234 ret = chip->als_cur_info.lux; /* return LAST VALUE */
238 for (i = 0; i < 4; i++) {
239 int reg = TSL258X_CMD_REG | (TSL258X_ALS_CHAN0LO + i);
241 ret = taos_i2c_read(chip->client, reg, &buf[i], 1);
243 dev_err(&chip->client->dev,
244 "taos_get_lux failed to read register %x\n",
251 * clear status, really interrupt status (interrupts are off), but
252 * we use the bit anyway - don't forget 0x80 - this is a command
254 ret = i2c_smbus_write_byte(chip->client,
255 (TSL258X_CMD_REG | TSL258X_CMD_SPL_FN |
256 TSL258X_CMD_ALS_INT_CLR));
259 dev_err(&chip->client->dev,
260 "taos_i2c_write_command failed in taos_get_lux, err = %d\n",
262 goto out_unlock; /* have no data, so return failure */
265 /* extract ALS/lux data */
266 ch0 = le16_to_cpup((const __le16 *)&buf[0]);
267 ch1 = le16_to_cpup((const __le16 *)&buf[2]);
269 chip->als_cur_info.als_ch0 = ch0;
270 chip->als_cur_info.als_ch1 = ch1;
272 if ((ch0 >= chip->als_saturation) || (ch1 >= chip->als_saturation))
276 /* have no data, so return LAST VALUE */
278 chip->als_cur_info.lux = 0;
281 /* calculate ratio */
282 ratio = (ch1 << 15) / ch0;
283 /* convert to unscaled lux using the pointer to the table */
284 for (p = (struct taos_lux *)taos_device_lux;
285 p->ratio != 0 && p->ratio < ratio; p++)
291 ch0lux = ((ch0 * p->ch0) +
292 (gainadj[chip->taos_settings.als_gain].ch0 >> 1))
293 / gainadj[chip->taos_settings.als_gain].ch0;
294 ch1lux = ((ch1 * p->ch1) +
295 (gainadj[chip->taos_settings.als_gain].ch1 >> 1))
296 / gainadj[chip->taos_settings.als_gain].ch1;
297 lux = ch0lux - ch1lux;
300 /* note: lux is 31 bit max at this point */
301 if (ch1lux > ch0lux) {
302 dev_dbg(&chip->client->dev, "No Data - Return last value\n");
304 chip->als_cur_info.lux = 0;
308 /* adjust for active time scale */
309 if (chip->als_time_scale == 0)
312 lux = (lux + (chip->als_time_scale >> 1)) /
313 chip->als_time_scale;
315 /* Adjust for active gain scale.
316 * The taos_device_lux tables above have a factor of 8192 built in,
317 * so we need to shift right.
318 * User-specified gain provides a multiplier.
319 * Apply user-specified gain before shifting right to retain precision.
320 * Use 64 bits to avoid overflow on multiplication.
321 * Then go back to 32 bits before division to avoid using div_u64().
324 lux64 = lux64 * chip->taos_settings.als_gain_trim;
327 lux = (lux + 500) / 1000;
328 if (lux > TSL258X_LUX_CALC_OVER_FLOW) { /* check for overflow */
330 lux = TSL258X_LUX_CALC_OVER_FLOW;
333 /* Update the structure with the latest VALID lux. */
334 chip->als_cur_info.lux = lux;
338 mutex_unlock(&chip->als_mutex);
343 * Obtain single reading and calculate the als_gain_trim (later used
344 * to derive actual lux).
345 * Return updated gain_trim value.
347 static int taos_als_calibrate(struct iio_dev *indio_dev)
349 struct tsl2583_chip *chip = iio_priv(indio_dev);
351 unsigned int gain_trim_val;
355 ret = i2c_smbus_write_byte(chip->client,
356 (TSL258X_CMD_REG | TSL258X_CNTRL));
358 dev_err(&chip->client->dev,
359 "taos_als_calibrate failed to reach the CNTRL register, ret=%d\n",
364 reg_val = i2c_smbus_read_byte(chip->client);
366 dev_err(&chip->client->dev,
367 "%s failed to read after writing to the CNTRL register\n",
372 if ((reg_val & (TSL258X_CNTL_ADC_ENBL | TSL258X_CNTL_PWR_ON))
373 != (TSL258X_CNTL_ADC_ENBL | TSL258X_CNTL_PWR_ON)) {
374 dev_err(&chip->client->dev,
375 "taos_als_calibrate failed: device not powered on with ADC enabled\n");
379 ret = i2c_smbus_write_byte(chip->client,
380 (TSL258X_CMD_REG | TSL258X_CNTRL));
382 dev_err(&chip->client->dev,
383 "taos_als_calibrate failed to reach the STATUS register, ret=%d\n",
387 reg_val = i2c_smbus_read_byte(chip->client);
389 dev_err(&chip->client->dev,
390 "%s failed to read after writing to the STATUS register\n",
395 if ((reg_val & TSL258X_STA_ADC_VALID) != TSL258X_STA_ADC_VALID) {
396 dev_err(&chip->client->dev,
397 "taos_als_calibrate failed: STATUS - ADC not valid.\n");
400 lux_val = taos_get_lux(indio_dev);
402 dev_err(&chip->client->dev, "taos_als_calibrate failed to get lux\n");
405 gain_trim_val = (unsigned int)(((chip->taos_settings.als_cal_target)
406 * chip->taos_settings.als_gain_trim) / lux_val);
408 if ((gain_trim_val < 250) || (gain_trim_val > 4000)) {
409 dev_err(&chip->client->dev,
410 "taos_als_calibrate failed: trim_val of %d is out of range\n",
414 chip->taos_settings.als_gain_trim = (int)gain_trim_val;
416 return (int)gain_trim_val;
420 * Turn the device on.
421 * Configuration must be set before calling this function.
423 static int taos_chip_on(struct iio_dev *indio_dev)
431 struct tsl2583_chip *chip = iio_priv(indio_dev);
433 /* and make sure we're not already on */
434 if (chip->taos_chip_status == TSL258X_CHIP_WORKING) {
435 /* if forcing a register update - turn off, then on */
436 dev_info(&chip->client->dev, "device is already enabled\n");
440 /* determine als integration register */
441 als_count = (chip->taos_settings.als_time * 100 + 135) / 270;
443 als_count = 1; /* ensure at least one cycle */
445 /* convert back to time (encompasses overrides) */
446 als_time = (als_count * 27 + 5) / 10;
447 chip->taos_config[TSL258X_ALS_TIME] = 256 - als_count;
449 /* Set the gain based on taos_settings struct */
450 chip->taos_config[TSL258X_GAIN] = chip->taos_settings.als_gain;
452 /* set chip struct re scaling and saturation */
453 chip->als_saturation = als_count * 922; /* 90% of full scale */
454 chip->als_time_scale = (als_time + 25) / 50;
457 * TSL258x Specific power-on / adc enable sequence
458 * Power on the device 1st.
460 utmp = TSL258X_CNTL_PWR_ON;
461 ret = i2c_smbus_write_byte_data(chip->client,
462 TSL258X_CMD_REG | TSL258X_CNTRL, utmp);
464 dev_err(&chip->client->dev, "taos_chip_on failed on CNTRL reg.\n");
469 * Use the following shadow copy for our delay before enabling ADC.
470 * Write all the registers.
472 for (i = 0, uP = chip->taos_config; i < TSL258X_REG_MAX; i++) {
473 ret = i2c_smbus_write_byte_data(chip->client,
477 dev_err(&chip->client->dev,
478 "taos_chip_on failed on reg %d.\n", i);
483 usleep_range(3000, 3500);
486 * initialize the desired mode of operation
488 utmp = TSL258X_CNTL_PWR_ON | TSL258X_CNTL_ADC_ENBL;
489 ret = i2c_smbus_write_byte_data(chip->client,
490 TSL258X_CMD_REG | TSL258X_CNTRL,
493 dev_err(&chip->client->dev, "taos_chip_on failed on 2nd CTRL reg.\n");
496 chip->taos_chip_status = TSL258X_CHIP_WORKING;
501 static int taos_chip_off(struct iio_dev *indio_dev)
503 struct tsl2583_chip *chip = iio_priv(indio_dev);
505 /* turn device off */
506 chip->taos_chip_status = TSL258X_CHIP_SUSPENDED;
507 return i2c_smbus_write_byte_data(chip->client,
508 TSL258X_CMD_REG | TSL258X_CNTRL,
512 /* Sysfs Interface Functions */
514 static ssize_t taos_gain_show(struct device *dev,
515 struct device_attribute *attr, char *buf)
517 struct iio_dev *indio_dev = dev_to_iio_dev(dev);
518 struct tsl2583_chip *chip = iio_priv(indio_dev);
521 switch (chip->taos_settings.als_gain) {
536 return sprintf(buf, "%s\n", gain);
539 static ssize_t taos_gain_store(struct device *dev,
540 struct device_attribute *attr,
541 const char *buf, size_t len)
543 struct iio_dev *indio_dev = dev_to_iio_dev(dev);
544 struct tsl2583_chip *chip = iio_priv(indio_dev);
547 if (kstrtoint(buf, 0, &value))
552 chip->taos_settings.als_gain = 0;
555 chip->taos_settings.als_gain = 1;
558 chip->taos_settings.als_gain = 2;
561 chip->taos_settings.als_gain = 3;
564 dev_err(dev, "Invalid Gain Index (must be 1,8,16,111)\n");
571 static ssize_t taos_gain_available_show(struct device *dev,
572 struct device_attribute *attr,
575 return sprintf(buf, "%s\n", "1 8 16 111");
578 static ssize_t taos_als_time_show(struct device *dev,
579 struct device_attribute *attr, char *buf)
581 struct iio_dev *indio_dev = dev_to_iio_dev(dev);
582 struct tsl2583_chip *chip = iio_priv(indio_dev);
584 return sprintf(buf, "%d\n", chip->taos_settings.als_time);
587 static ssize_t taos_als_time_store(struct device *dev,
588 struct device_attribute *attr,
589 const char *buf, size_t len)
591 struct iio_dev *indio_dev = dev_to_iio_dev(dev);
592 struct tsl2583_chip *chip = iio_priv(indio_dev);
595 if (kstrtoint(buf, 0, &value))
598 if ((value < 50) || (value > 650))
604 chip->taos_settings.als_time = value;
609 static ssize_t taos_als_time_available_show(struct device *dev,
610 struct device_attribute *attr,
613 return sprintf(buf, "%s\n",
614 "50 100 150 200 250 300 350 400 450 500 550 600 650");
617 static ssize_t taos_als_trim_show(struct device *dev,
618 struct device_attribute *attr, char *buf)
620 struct iio_dev *indio_dev = dev_to_iio_dev(dev);
621 struct tsl2583_chip *chip = iio_priv(indio_dev);
623 return sprintf(buf, "%d\n", chip->taos_settings.als_gain_trim);
626 static ssize_t taos_als_trim_store(struct device *dev,
627 struct device_attribute *attr,
628 const char *buf, size_t len)
630 struct iio_dev *indio_dev = dev_to_iio_dev(dev);
631 struct tsl2583_chip *chip = iio_priv(indio_dev);
634 if (kstrtoint(buf, 0, &value))
638 chip->taos_settings.als_gain_trim = value;
643 static ssize_t taos_als_cal_target_show(struct device *dev,
644 struct device_attribute *attr,
647 struct iio_dev *indio_dev = dev_to_iio_dev(dev);
648 struct tsl2583_chip *chip = iio_priv(indio_dev);
650 return sprintf(buf, "%d\n", chip->taos_settings.als_cal_target);
653 static ssize_t taos_als_cal_target_store(struct device *dev,
654 struct device_attribute *attr,
655 const char *buf, size_t len)
657 struct iio_dev *indio_dev = dev_to_iio_dev(dev);
658 struct tsl2583_chip *chip = iio_priv(indio_dev);
661 if (kstrtoint(buf, 0, &value))
665 chip->taos_settings.als_cal_target = value;
670 static ssize_t taos_lux_show(struct device *dev, struct device_attribute *attr,
675 ret = taos_get_lux(dev_to_iio_dev(dev));
679 return sprintf(buf, "%d\n", ret);
682 static ssize_t taos_do_calibrate(struct device *dev,
683 struct device_attribute *attr,
684 const char *buf, size_t len)
686 struct iio_dev *indio_dev = dev_to_iio_dev(dev);
689 if (kstrtoint(buf, 0, &value))
693 taos_als_calibrate(indio_dev);
698 static ssize_t taos_luxtable_show(struct device *dev,
699 struct device_attribute *attr, char *buf)
704 for (i = 0; i < ARRAY_SIZE(taos_device_lux); i++) {
705 offset += sprintf(buf + offset, "%u,%u,%u,",
706 taos_device_lux[i].ratio,
707 taos_device_lux[i].ch0,
708 taos_device_lux[i].ch1);
709 if (taos_device_lux[i].ratio == 0) {
711 * We just printed the first "0" entry.
712 * Now get rid of the extra "," and break.
719 offset += sprintf(buf + offset, "\n");
723 static ssize_t taos_luxtable_store(struct device *dev,
724 struct device_attribute *attr,
725 const char *buf, size_t len)
727 struct iio_dev *indio_dev = dev_to_iio_dev(dev);
728 struct tsl2583_chip *chip = iio_priv(indio_dev);
729 int value[ARRAY_SIZE(taos_device_lux) * 3 + 1];
732 get_options(buf, ARRAY_SIZE(value), value);
734 /* We now have an array of ints starting at value[1], and
735 * enumerated by value[0].
736 * We expect each group of three ints is one table entry,
737 * and the last table entry is all 0.
740 if ((n % 3) || n < 6 || n > ((ARRAY_SIZE(taos_device_lux) - 1) * 3)) {
741 dev_info(dev, "LUX TABLE INPUT ERROR 1 Value[0]=%d\n", n);
744 if ((value[(n - 2)] | value[(n - 1)] | value[n]) != 0) {
745 dev_info(dev, "LUX TABLE INPUT ERROR 2 Value[0]=%d\n", n);
749 if (chip->taos_chip_status == TSL258X_CHIP_WORKING)
750 taos_chip_off(indio_dev);
752 /* Zero out the table */
753 memset(taos_device_lux, 0, sizeof(taos_device_lux));
754 memcpy(taos_device_lux, &value[1], (value[0] * 4));
756 taos_chip_on(indio_dev);
761 static DEVICE_ATTR(illuminance0_calibscale, S_IRUGO | S_IWUSR,
762 taos_gain_show, taos_gain_store);
763 static DEVICE_ATTR(illuminance0_calibscale_available, S_IRUGO,
764 taos_gain_available_show, NULL);
766 static DEVICE_ATTR(illuminance0_integration_time, S_IRUGO | S_IWUSR,
767 taos_als_time_show, taos_als_time_store);
768 static DEVICE_ATTR(illuminance0_integration_time_available, S_IRUGO,
769 taos_als_time_available_show, NULL);
771 static DEVICE_ATTR(illuminance0_calibbias, S_IRUGO | S_IWUSR,
772 taos_als_trim_show, taos_als_trim_store);
774 static DEVICE_ATTR(illuminance0_input_target, S_IRUGO | S_IWUSR,
775 taos_als_cal_target_show, taos_als_cal_target_store);
777 static DEVICE_ATTR(illuminance0_input, S_IRUGO, taos_lux_show, NULL);
778 static DEVICE_ATTR(illuminance0_calibrate, S_IWUSR, NULL, taos_do_calibrate);
779 static DEVICE_ATTR(illuminance0_lux_table, S_IRUGO | S_IWUSR,
780 taos_luxtable_show, taos_luxtable_store);
782 static struct attribute *sysfs_attrs_ctrl[] = {
783 &dev_attr_illuminance0_calibscale.attr, /* Gain */
784 &dev_attr_illuminance0_calibscale_available.attr,
785 &dev_attr_illuminance0_integration_time.attr, /* I time*/
786 &dev_attr_illuminance0_integration_time_available.attr,
787 &dev_attr_illuminance0_calibbias.attr, /* trim */
788 &dev_attr_illuminance0_input_target.attr,
789 &dev_attr_illuminance0_input.attr,
790 &dev_attr_illuminance0_calibrate.attr,
791 &dev_attr_illuminance0_lux_table.attr,
795 static const struct attribute_group tsl2583_attribute_group = {
796 .attrs = sysfs_attrs_ctrl,
799 /* Use the default register values to identify the Taos device */
800 static int taos_tsl258x_device(unsigned char *bufp)
802 return ((bufp[TSL258X_CHIPID] & 0xf0) == 0x90);
805 static const struct iio_info tsl2583_info = {
806 .attrs = &tsl2583_attribute_group,
807 .driver_module = THIS_MODULE,
811 * Client probe function - When a valid device is found, the driver's device
812 * data structure is updated, and initialization completes successfully.
814 static int taos_probe(struct i2c_client *clientp,
815 const struct i2c_device_id *idp)
818 unsigned char buf[TSL258X_MAX_DEVICE_REGS];
819 struct tsl2583_chip *chip;
820 struct iio_dev *indio_dev;
822 if (!i2c_check_functionality(clientp->adapter,
823 I2C_FUNC_SMBUS_BYTE_DATA)) {
824 dev_err(&clientp->dev, "taos_probe() - i2c smbus byte data func unsupported\n");
828 indio_dev = devm_iio_device_alloc(&clientp->dev, sizeof(*chip));
831 chip = iio_priv(indio_dev);
832 chip->client = clientp;
833 i2c_set_clientdata(clientp, indio_dev);
835 mutex_init(&chip->als_mutex);
836 chip->taos_chip_status = TSL258X_CHIP_UNKNOWN;
837 memcpy(chip->taos_config, taos_config, sizeof(chip->taos_config));
839 for (i = 0; i < TSL258X_MAX_DEVICE_REGS; i++) {
840 ret = i2c_smbus_write_byte(clientp,
841 (TSL258X_CMD_REG | (TSL258X_CNTRL + i)));
843 dev_err(&clientp->dev,
844 "i2c_smbus_write_byte to cmd reg failed in taos_probe(), err = %d\n",
848 ret = i2c_smbus_read_byte(clientp);
850 dev_err(&clientp->dev,
851 "i2c_smbus_read_byte from reg failed in taos_probe(), err = %d\n",
858 if (!taos_tsl258x_device(buf)) {
859 dev_info(&clientp->dev,
860 "i2c device found but does not match expected id in taos_probe()\n");
864 ret = i2c_smbus_write_byte(clientp, (TSL258X_CMD_REG | TSL258X_CNTRL));
866 dev_err(&clientp->dev,
867 "i2c_smbus_write_byte() to cmd reg failed in taos_probe(), err = %d\n",
872 indio_dev->info = &tsl2583_info;
873 indio_dev->dev.parent = &clientp->dev;
874 indio_dev->modes = INDIO_DIRECT_MODE;
875 indio_dev->name = chip->client->name;
876 ret = devm_iio_device_register(indio_dev->dev.parent, indio_dev);
878 dev_err(&clientp->dev, "iio registration failed\n");
882 /* Load up the V2 defaults (these are hard coded defaults for now) */
885 /* Make sure the chip is on */
886 taos_chip_on(indio_dev);
888 dev_info(&clientp->dev, "Light sensor found.\n");
892 #ifdef CONFIG_PM_SLEEP
893 static int taos_suspend(struct device *dev)
895 struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
896 struct tsl2583_chip *chip = iio_priv(indio_dev);
899 mutex_lock(&chip->als_mutex);
901 if (chip->taos_chip_status == TSL258X_CHIP_WORKING) {
902 ret = taos_chip_off(indio_dev);
903 chip->taos_chip_status = TSL258X_CHIP_SUSPENDED;
906 mutex_unlock(&chip->als_mutex);
910 static int taos_resume(struct device *dev)
912 struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
913 struct tsl2583_chip *chip = iio_priv(indio_dev);
916 mutex_lock(&chip->als_mutex);
918 if (chip->taos_chip_status == TSL258X_CHIP_SUSPENDED)
919 ret = taos_chip_on(indio_dev);
921 mutex_unlock(&chip->als_mutex);
925 static SIMPLE_DEV_PM_OPS(taos_pm_ops, taos_suspend, taos_resume);
926 #define TAOS_PM_OPS (&taos_pm_ops)
928 #define TAOS_PM_OPS NULL
931 static struct i2c_device_id taos_idtable[] = {
937 MODULE_DEVICE_TABLE(i2c, taos_idtable);
940 static const struct of_device_id taos2583_of_match[] = {
941 { .compatible = "amstaos,tsl2580", },
942 { .compatible = "amstaos,tsl2581", },
943 { .compatible = "amstaos,tsl2583", },
946 MODULE_DEVICE_TABLE(of, taos2583_of_match);
948 #define taos2583_of_match NULL
951 /* Driver definition */
952 static struct i2c_driver taos_driver = {
956 .of_match_table = taos2583_of_match,
958 .id_table = taos_idtable,
961 module_i2c_driver(taos_driver);
963 MODULE_AUTHOR("J. August Brenner<jbrenner@taosinc.com>");
964 MODULE_DESCRIPTION("TAOS tsl2583 ambient light sensor driver");
965 MODULE_LICENSE("GPL");