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 *val = i2c_smbus_read_byte(client);
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
194 static int taos_get_lux(struct iio_dev *indio_dev)
196 u16 ch0, ch1; /* separated ch0/ch1 data from device */
197 u32 lux; /* raw lux calculated from device data */
202 struct tsl2583_chip *chip = iio_priv(indio_dev);
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 */
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");
219 ret = taos_i2c_read(chip->client, (TSL258X_CMD_REG), &buf[0], 1);
221 dev_err(&chip->client->dev, "taos_get_lux failed to read CMD_REG\n");
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 */
231 for (i = 0; i < 4; i++) {
232 int reg = TSL258X_CMD_REG | (TSL258X_ALS_CHAN0LO + i);
234 ret = taos_i2c_read(chip->client, reg, &buf[i], 1);
236 dev_err(&chip->client->dev,
237 "taos_get_lux failed to read register %x\n",
243 /* clear status, really interrupt status (interrupts are off), but
244 * we use the bit anyway - don't forget 0x80 - this is a command*/
245 ret = i2c_smbus_write_byte(chip->client,
246 (TSL258X_CMD_REG | TSL258X_CMD_SPL_FN |
247 TSL258X_CMD_ALS_INT_CLR));
250 dev_err(&chip->client->dev,
251 "taos_i2c_write_command failed in taos_get_lux, err = %d\n",
253 goto out_unlock; /* have no data, so return failure */
256 /* extract ALS/lux data */
257 ch0 = le16_to_cpup((const __le16 *)&buf[0]);
258 ch1 = le16_to_cpup((const __le16 *)&buf[2]);
260 chip->als_cur_info.als_ch0 = ch0;
261 chip->als_cur_info.als_ch1 = ch1;
263 if ((ch0 >= chip->als_saturation) || (ch1 >= chip->als_saturation))
267 /* have no data, so return LAST VALUE */
268 ret = chip->als_cur_info.lux = 0;
271 /* calculate ratio */
272 ratio = (ch1 << 15) / ch0;
273 /* convert to unscaled lux using the pointer to the table */
274 for (p = (struct taos_lux *) taos_device_lux;
275 p->ratio != 0 && p->ratio < ratio; p++)
281 ch0lux = ((ch0 * p->ch0) +
282 (gainadj[chip->taos_settings.als_gain].ch0 >> 1))
283 / gainadj[chip->taos_settings.als_gain].ch0;
284 ch1lux = ((ch1 * p->ch1) +
285 (gainadj[chip->taos_settings.als_gain].ch1 >> 1))
286 / gainadj[chip->taos_settings.als_gain].ch1;
287 lux = ch0lux - ch1lux;
290 /* note: lux is 31 bit max at this point */
291 if (ch1lux > ch0lux) {
292 dev_dbg(&chip->client->dev, "No Data - Return last value\n");
293 ret = chip->als_cur_info.lux = 0;
297 /* adjust for active time scale */
298 if (chip->als_time_scale == 0)
301 lux = (lux + (chip->als_time_scale >> 1)) /
302 chip->als_time_scale;
304 /* Adjust for active gain scale.
305 * The taos_device_lux tables above have a factor of 8192 built in,
306 * so we need to shift right.
307 * User-specified gain provides a multiplier.
308 * Apply user-specified gain before shifting right to retain precision.
309 * Use 64 bits to avoid overflow on multiplication.
310 * Then go back to 32 bits before division to avoid using div_u64().
313 lux64 = lux64 * chip->taos_settings.als_gain_trim;
316 lux = (lux + 500) / 1000;
317 if (lux > TSL258X_LUX_CALC_OVER_FLOW) { /* check for overflow */
319 lux = TSL258X_LUX_CALC_OVER_FLOW;
322 /* Update the structure with the latest VALID lux. */
323 chip->als_cur_info.lux = lux;
327 mutex_unlock(&chip->als_mutex);
332 * Obtain single reading and calculate the als_gain_trim (later used
333 * to derive actual lux).
334 * Return updated gain_trim value.
336 static int taos_als_calibrate(struct iio_dev *indio_dev)
338 struct tsl2583_chip *chip = iio_priv(indio_dev);
340 unsigned int gain_trim_val;
344 ret = i2c_smbus_write_byte(chip->client,
345 (TSL258X_CMD_REG | TSL258X_CNTRL));
347 dev_err(&chip->client->dev,
348 "taos_als_calibrate failed to reach the CNTRL register, ret=%d\n",
353 reg_val = i2c_smbus_read_byte(chip->client);
354 if ((reg_val & (TSL258X_CNTL_ADC_ENBL | TSL258X_CNTL_PWR_ON))
355 != (TSL258X_CNTL_ADC_ENBL | TSL258X_CNTL_PWR_ON)) {
356 dev_err(&chip->client->dev,
357 "taos_als_calibrate failed: device not powered on with ADC enabled\n");
361 ret = i2c_smbus_write_byte(chip->client,
362 (TSL258X_CMD_REG | TSL258X_CNTRL));
364 dev_err(&chip->client->dev,
365 "taos_als_calibrate failed to reach the STATUS register, ret=%d\n",
369 reg_val = i2c_smbus_read_byte(chip->client);
371 if ((reg_val & TSL258X_STA_ADC_VALID) != TSL258X_STA_ADC_VALID) {
372 dev_err(&chip->client->dev,
373 "taos_als_calibrate failed: STATUS - ADC not valid.\n");
376 lux_val = taos_get_lux(indio_dev);
378 dev_err(&chip->client->dev, "taos_als_calibrate failed to get lux\n");
381 gain_trim_val = (unsigned int) (((chip->taos_settings.als_cal_target)
382 * chip->taos_settings.als_gain_trim) / lux_val);
384 if ((gain_trim_val < 250) || (gain_trim_val > 4000)) {
385 dev_err(&chip->client->dev,
386 "taos_als_calibrate failed: trim_val of %d is out of range\n",
390 chip->taos_settings.als_gain_trim = (int) gain_trim_val;
392 return (int) gain_trim_val;
396 * Turn the device on.
397 * Configuration must be set before calling this function.
399 static int taos_chip_on(struct iio_dev *indio_dev)
407 struct tsl2583_chip *chip = iio_priv(indio_dev);
409 /* and make sure we're not already on */
410 if (chip->taos_chip_status == TSL258X_CHIP_WORKING) {
411 /* if forcing a register update - turn off, then on */
412 dev_info(&chip->client->dev, "device is already enabled\n");
416 /* determine als integration register */
417 als_count = (chip->taos_settings.als_time * 100 + 135) / 270;
419 als_count = 1; /* ensure at least one cycle */
421 /* convert back to time (encompasses overrides) */
422 als_time = (als_count * 27 + 5) / 10;
423 chip->taos_config[TSL258X_ALS_TIME] = 256 - als_count;
425 /* Set the gain based on taos_settings struct */
426 chip->taos_config[TSL258X_GAIN] = chip->taos_settings.als_gain;
428 /* set chip struct re scaling and saturation */
429 chip->als_saturation = als_count * 922; /* 90% of full scale */
430 chip->als_time_scale = (als_time + 25) / 50;
432 /* TSL258x Specific power-on / adc enable sequence
433 * Power on the device 1st. */
434 utmp = TSL258X_CNTL_PWR_ON;
435 ret = i2c_smbus_write_byte_data(chip->client,
436 TSL258X_CMD_REG | TSL258X_CNTRL, utmp);
438 dev_err(&chip->client->dev, "taos_chip_on failed on CNTRL reg.\n");
442 /* Use the following shadow copy for our delay before enabling ADC.
443 * Write all the registers. */
444 for (i = 0, uP = chip->taos_config; i < TSL258X_REG_MAX; i++) {
445 ret = i2c_smbus_write_byte_data(chip->client,
449 dev_err(&chip->client->dev,
450 "taos_chip_on failed on reg %d.\n", i);
455 usleep_range(3000, 3500);
456 /* NOW enable the ADC
457 * initialize the desired mode of operation */
458 utmp = TSL258X_CNTL_PWR_ON | TSL258X_CNTL_ADC_ENBL;
459 ret = i2c_smbus_write_byte_data(chip->client,
460 TSL258X_CMD_REG | TSL258X_CNTRL,
463 dev_err(&chip->client->dev, "taos_chip_on failed on 2nd CTRL reg.\n");
466 chip->taos_chip_status = TSL258X_CHIP_WORKING;
471 static int taos_chip_off(struct iio_dev *indio_dev)
473 struct tsl2583_chip *chip = iio_priv(indio_dev);
475 /* turn device off */
476 chip->taos_chip_status = TSL258X_CHIP_SUSPENDED;
477 return i2c_smbus_write_byte_data(chip->client,
478 TSL258X_CMD_REG | TSL258X_CNTRL,
482 /* Sysfs Interface Functions */
484 static ssize_t taos_power_state_show(struct device *dev,
485 struct device_attribute *attr, char *buf)
487 struct iio_dev *indio_dev = dev_to_iio_dev(dev);
488 struct tsl2583_chip *chip = iio_priv(indio_dev);
490 return sprintf(buf, "%d\n", chip->taos_chip_status);
493 static ssize_t taos_power_state_store(struct device *dev,
494 struct device_attribute *attr, const char *buf, size_t len)
496 struct iio_dev *indio_dev = dev_to_iio_dev(dev);
499 if (kstrtoint(buf, 0, &value))
503 taos_chip_off(indio_dev);
505 taos_chip_on(indio_dev);
510 static ssize_t taos_gain_show(struct device *dev,
511 struct device_attribute *attr, char *buf)
513 struct iio_dev *indio_dev = dev_to_iio_dev(dev);
514 struct tsl2583_chip *chip = iio_priv(indio_dev);
517 switch (chip->taos_settings.als_gain) {
532 return sprintf(buf, "%s\n", gain);
535 static ssize_t taos_gain_store(struct device *dev,
536 struct device_attribute *attr, const char *buf, size_t len)
538 struct iio_dev *indio_dev = dev_to_iio_dev(dev);
539 struct tsl2583_chip *chip = iio_priv(indio_dev);
542 if (kstrtoint(buf, 0, &value))
547 chip->taos_settings.als_gain = 0;
550 chip->taos_settings.als_gain = 1;
553 chip->taos_settings.als_gain = 2;
556 chip->taos_settings.als_gain = 3;
559 dev_err(dev, "Invalid Gain Index (must be 1,8,16,111)\n");
566 static ssize_t taos_gain_available_show(struct device *dev,
567 struct device_attribute *attr, char *buf)
569 return sprintf(buf, "%s\n", "1 8 16 111");
572 static ssize_t taos_als_time_show(struct device *dev,
573 struct device_attribute *attr, char *buf)
575 struct iio_dev *indio_dev = dev_to_iio_dev(dev);
576 struct tsl2583_chip *chip = iio_priv(indio_dev);
578 return sprintf(buf, "%d\n", chip->taos_settings.als_time);
581 static ssize_t taos_als_time_store(struct device *dev,
582 struct device_attribute *attr, const char *buf, size_t len)
584 struct iio_dev *indio_dev = dev_to_iio_dev(dev);
585 struct tsl2583_chip *chip = iio_priv(indio_dev);
588 if (kstrtoint(buf, 0, &value))
591 if ((value < 50) || (value > 650))
597 chip->taos_settings.als_time = value;
602 static ssize_t taos_als_time_available_show(struct device *dev,
603 struct device_attribute *attr, char *buf)
605 return sprintf(buf, "%s\n",
606 "50 100 150 200 250 300 350 400 450 500 550 600 650");
609 static ssize_t taos_als_trim_show(struct device *dev,
610 struct device_attribute *attr, char *buf)
612 struct iio_dev *indio_dev = dev_to_iio_dev(dev);
613 struct tsl2583_chip *chip = iio_priv(indio_dev);
615 return sprintf(buf, "%d\n", chip->taos_settings.als_gain_trim);
618 static ssize_t taos_als_trim_store(struct device *dev,
619 struct device_attribute *attr, const char *buf, size_t len)
621 struct iio_dev *indio_dev = dev_to_iio_dev(dev);
622 struct tsl2583_chip *chip = iio_priv(indio_dev);
625 if (kstrtoint(buf, 0, &value))
629 chip->taos_settings.als_gain_trim = value;
634 static ssize_t taos_als_cal_target_show(struct device *dev,
635 struct device_attribute *attr, char *buf)
637 struct iio_dev *indio_dev = dev_to_iio_dev(dev);
638 struct tsl2583_chip *chip = iio_priv(indio_dev);
640 return sprintf(buf, "%d\n", chip->taos_settings.als_cal_target);
643 static ssize_t taos_als_cal_target_store(struct device *dev,
644 struct device_attribute *attr, const char *buf, size_t len)
646 struct iio_dev *indio_dev = dev_to_iio_dev(dev);
647 struct tsl2583_chip *chip = iio_priv(indio_dev);
650 if (kstrtoint(buf, 0, &value))
654 chip->taos_settings.als_cal_target = value;
659 static ssize_t taos_lux_show(struct device *dev, struct device_attribute *attr,
664 ret = taos_get_lux(dev_to_iio_dev(dev));
668 return sprintf(buf, "%d\n", ret);
671 static ssize_t taos_do_calibrate(struct device *dev,
672 struct device_attribute *attr, const char *buf, size_t len)
674 struct iio_dev *indio_dev = dev_to_iio_dev(dev);
677 if (kstrtoint(buf, 0, &value))
681 taos_als_calibrate(indio_dev);
686 static ssize_t taos_luxtable_show(struct device *dev,
687 struct device_attribute *attr, char *buf)
692 for (i = 0; i < ARRAY_SIZE(taos_device_lux); i++) {
693 offset += sprintf(buf + offset, "%u,%u,%u,",
694 taos_device_lux[i].ratio,
695 taos_device_lux[i].ch0,
696 taos_device_lux[i].ch1);
697 if (taos_device_lux[i].ratio == 0) {
698 /* We just printed the first "0" entry.
699 * Now get rid of the extra "," and break. */
705 offset += sprintf(buf + offset, "\n");
709 static ssize_t taos_luxtable_store(struct device *dev,
710 struct device_attribute *attr, const char *buf, size_t len)
712 struct iio_dev *indio_dev = dev_to_iio_dev(dev);
713 struct tsl2583_chip *chip = iio_priv(indio_dev);
714 int value[ARRAY_SIZE(taos_device_lux)*3 + 1];
717 get_options(buf, ARRAY_SIZE(value), value);
719 /* We now have an array of ints starting at value[1], and
720 * enumerated by value[0].
721 * We expect each group of three ints is one table entry,
722 * and the last table entry is all 0.
725 if ((n % 3) || n < 6 || n > ((ARRAY_SIZE(taos_device_lux) - 1) * 3)) {
726 dev_info(dev, "LUX TABLE INPUT ERROR 1 Value[0]=%d\n", n);
729 if ((value[(n - 2)] | value[(n - 1)] | value[n]) != 0) {
730 dev_info(dev, "LUX TABLE INPUT ERROR 2 Value[0]=%d\n", n);
734 if (chip->taos_chip_status == TSL258X_CHIP_WORKING)
735 taos_chip_off(indio_dev);
737 /* Zero out the table */
738 memset(taos_device_lux, 0, sizeof(taos_device_lux));
739 memcpy(taos_device_lux, &value[1], (value[0] * 4));
741 taos_chip_on(indio_dev);
746 static DEVICE_ATTR(power_state, S_IRUGO | S_IWUSR,
747 taos_power_state_show, taos_power_state_store);
749 static DEVICE_ATTR(illuminance0_calibscale, S_IRUGO | S_IWUSR,
750 taos_gain_show, taos_gain_store);
751 static DEVICE_ATTR(illuminance0_calibscale_available, S_IRUGO,
752 taos_gain_available_show, NULL);
754 static DEVICE_ATTR(illuminance0_integration_time, S_IRUGO | S_IWUSR,
755 taos_als_time_show, taos_als_time_store);
756 static DEVICE_ATTR(illuminance0_integration_time_available, S_IRUGO,
757 taos_als_time_available_show, NULL);
759 static DEVICE_ATTR(illuminance0_calibbias, S_IRUGO | S_IWUSR,
760 taos_als_trim_show, taos_als_trim_store);
762 static DEVICE_ATTR(illuminance0_input_target, S_IRUGO | S_IWUSR,
763 taos_als_cal_target_show, taos_als_cal_target_store);
765 static DEVICE_ATTR(illuminance0_input, S_IRUGO, taos_lux_show, NULL);
766 static DEVICE_ATTR(illuminance0_calibrate, S_IWUSR, NULL, taos_do_calibrate);
767 static DEVICE_ATTR(illuminance0_lux_table, S_IRUGO | S_IWUSR,
768 taos_luxtable_show, taos_luxtable_store);
770 static struct attribute *sysfs_attrs_ctrl[] = {
771 &dev_attr_power_state.attr,
772 &dev_attr_illuminance0_calibscale.attr, /* Gain */
773 &dev_attr_illuminance0_calibscale_available.attr,
774 &dev_attr_illuminance0_integration_time.attr, /* I time*/
775 &dev_attr_illuminance0_integration_time_available.attr,
776 &dev_attr_illuminance0_calibbias.attr, /* trim */
777 &dev_attr_illuminance0_input_target.attr,
778 &dev_attr_illuminance0_input.attr,
779 &dev_attr_illuminance0_calibrate.attr,
780 &dev_attr_illuminance0_lux_table.attr,
784 static struct attribute_group tsl2583_attribute_group = {
785 .attrs = sysfs_attrs_ctrl,
788 /* Use the default register values to identify the Taos device */
789 static int taos_tsl258x_device(unsigned char *bufp)
791 return ((bufp[TSL258X_CHIPID] & 0xf0) == 0x90);
794 static const struct iio_info tsl2583_info = {
795 .attrs = &tsl2583_attribute_group,
796 .driver_module = THIS_MODULE,
800 * Client probe function - When a valid device is found, the driver's device
801 * data structure is updated, and initialization completes successfully.
803 static int taos_probe(struct i2c_client *clientp,
804 const struct i2c_device_id *idp)
807 unsigned char buf[TSL258X_MAX_DEVICE_REGS];
808 struct tsl2583_chip *chip;
809 struct iio_dev *indio_dev;
811 if (!i2c_check_functionality(clientp->adapter,
812 I2C_FUNC_SMBUS_BYTE_DATA)) {
813 dev_err(&clientp->dev, "taos_probe() - i2c smbus byte data func unsupported\n");
817 indio_dev = devm_iio_device_alloc(&clientp->dev, sizeof(*chip));
820 chip = iio_priv(indio_dev);
821 chip->client = clientp;
822 i2c_set_clientdata(clientp, indio_dev);
824 mutex_init(&chip->als_mutex);
825 chip->taos_chip_status = TSL258X_CHIP_UNKNOWN;
826 memcpy(chip->taos_config, taos_config, sizeof(chip->taos_config));
828 for (i = 0; i < TSL258X_MAX_DEVICE_REGS; i++) {
829 ret = i2c_smbus_write_byte(clientp,
830 (TSL258X_CMD_REG | (TSL258X_CNTRL + i)));
832 dev_err(&clientp->dev,
833 "i2c_smbus_write_byte to cmd reg failed in taos_probe(), err = %d\n",
837 ret = i2c_smbus_read_byte(clientp);
839 dev_err(&clientp->dev,
840 "i2c_smbus_read_byte from reg failed in taos_probe(), err = %d\n",
847 if (!taos_tsl258x_device(buf)) {
848 dev_info(&clientp->dev,
849 "i2c device found but does not match expected id in taos_probe()\n");
853 ret = i2c_smbus_write_byte(clientp, (TSL258X_CMD_REG | TSL258X_CNTRL));
855 dev_err(&clientp->dev,
856 "i2c_smbus_write_byte() to cmd reg failed in taos_probe(), err = %d\n",
861 indio_dev->info = &tsl2583_info;
862 indio_dev->dev.parent = &clientp->dev;
863 indio_dev->modes = INDIO_DIRECT_MODE;
864 indio_dev->name = chip->client->name;
865 ret = devm_iio_device_register(indio_dev->dev.parent, indio_dev);
867 dev_err(&clientp->dev, "iio registration failed\n");
871 /* Load up the V2 defaults (these are hard coded defaults for now) */
874 /* Make sure the chip is on */
875 taos_chip_on(indio_dev);
877 dev_info(&clientp->dev, "Light sensor found.\n");
881 #ifdef CONFIG_PM_SLEEP
882 static int taos_suspend(struct device *dev)
884 struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
885 struct tsl2583_chip *chip = iio_priv(indio_dev);
888 mutex_lock(&chip->als_mutex);
890 if (chip->taos_chip_status == TSL258X_CHIP_WORKING) {
891 ret = taos_chip_off(indio_dev);
892 chip->taos_chip_status = TSL258X_CHIP_SUSPENDED;
895 mutex_unlock(&chip->als_mutex);
899 static int taos_resume(struct device *dev)
901 struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
902 struct tsl2583_chip *chip = iio_priv(indio_dev);
905 mutex_lock(&chip->als_mutex);
907 if (chip->taos_chip_status == TSL258X_CHIP_SUSPENDED)
908 ret = taos_chip_on(indio_dev);
910 mutex_unlock(&chip->als_mutex);
914 static SIMPLE_DEV_PM_OPS(taos_pm_ops, taos_suspend, taos_resume);
915 #define TAOS_PM_OPS (&taos_pm_ops)
917 #define TAOS_PM_OPS NULL
920 static struct i2c_device_id taos_idtable[] = {
926 MODULE_DEVICE_TABLE(i2c, taos_idtable);
928 /* Driver definition */
929 static struct i2c_driver taos_driver = {
934 .id_table = taos_idtable,
937 module_i2c_driver(taos_driver);
939 MODULE_AUTHOR("J. August Brenner<jbrenner@taosinc.com>");
940 MODULE_DESCRIPTION("TAOS tsl2583 ambient light sensor driver");
941 MODULE_LICENSE("GPL");