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",
244 * clear status, really interrupt status (interrupts are off), but
245 * we use the bit anyway - don't forget 0x80 - this is a command
247 ret = i2c_smbus_write_byte(chip->client,
248 (TSL258X_CMD_REG | TSL258X_CMD_SPL_FN |
249 TSL258X_CMD_ALS_INT_CLR));
252 dev_err(&chip->client->dev,
253 "taos_i2c_write_command failed in taos_get_lux, err = %d\n",
255 goto out_unlock; /* have no data, so return failure */
258 /* extract ALS/lux data */
259 ch0 = le16_to_cpup((const __le16 *)&buf[0]);
260 ch1 = le16_to_cpup((const __le16 *)&buf[2]);
262 chip->als_cur_info.als_ch0 = ch0;
263 chip->als_cur_info.als_ch1 = ch1;
265 if ((ch0 >= chip->als_saturation) || (ch1 >= chip->als_saturation))
269 /* have no data, so return LAST VALUE */
271 chip->als_cur_info.lux = 0;
274 /* calculate ratio */
275 ratio = (ch1 << 15) / ch0;
276 /* convert to unscaled lux using the pointer to the table */
277 for (p = (struct taos_lux *)taos_device_lux;
278 p->ratio != 0 && p->ratio < ratio; p++)
284 ch0lux = ((ch0 * p->ch0) +
285 (gainadj[chip->taos_settings.als_gain].ch0 >> 1))
286 / gainadj[chip->taos_settings.als_gain].ch0;
287 ch1lux = ((ch1 * p->ch1) +
288 (gainadj[chip->taos_settings.als_gain].ch1 >> 1))
289 / gainadj[chip->taos_settings.als_gain].ch1;
290 lux = ch0lux - ch1lux;
293 /* note: lux is 31 bit max at this point */
294 if (ch1lux > ch0lux) {
295 dev_dbg(&chip->client->dev, "No Data - Return last value\n");
297 chip->als_cur_info.lux = 0;
301 /* adjust for active time scale */
302 if (chip->als_time_scale == 0)
305 lux = (lux + (chip->als_time_scale >> 1)) /
306 chip->als_time_scale;
308 /* Adjust for active gain scale.
309 * The taos_device_lux tables above have a factor of 8192 built in,
310 * so we need to shift right.
311 * User-specified gain provides a multiplier.
312 * Apply user-specified gain before shifting right to retain precision.
313 * Use 64 bits to avoid overflow on multiplication.
314 * Then go back to 32 bits before division to avoid using div_u64().
317 lux64 = lux64 * chip->taos_settings.als_gain_trim;
320 lux = (lux + 500) / 1000;
321 if (lux > TSL258X_LUX_CALC_OVER_FLOW) { /* check for overflow */
323 lux = TSL258X_LUX_CALC_OVER_FLOW;
326 /* Update the structure with the latest VALID lux. */
327 chip->als_cur_info.lux = lux;
331 mutex_unlock(&chip->als_mutex);
336 * Obtain single reading and calculate the als_gain_trim (later used
337 * to derive actual lux).
338 * Return updated gain_trim value.
340 static int taos_als_calibrate(struct iio_dev *indio_dev)
342 struct tsl2583_chip *chip = iio_priv(indio_dev);
344 unsigned int gain_trim_val;
348 ret = i2c_smbus_write_byte(chip->client,
349 (TSL258X_CMD_REG | TSL258X_CNTRL));
351 dev_err(&chip->client->dev,
352 "taos_als_calibrate failed to reach the CNTRL register, ret=%d\n",
357 reg_val = i2c_smbus_read_byte(chip->client);
358 if ((reg_val & (TSL258X_CNTL_ADC_ENBL | TSL258X_CNTL_PWR_ON))
359 != (TSL258X_CNTL_ADC_ENBL | TSL258X_CNTL_PWR_ON)) {
360 dev_err(&chip->client->dev,
361 "taos_als_calibrate failed: device not powered on with ADC enabled\n");
365 ret = i2c_smbus_write_byte(chip->client,
366 (TSL258X_CMD_REG | TSL258X_CNTRL));
368 dev_err(&chip->client->dev,
369 "taos_als_calibrate failed to reach the STATUS register, ret=%d\n",
373 reg_val = i2c_smbus_read_byte(chip->client);
375 if ((reg_val & TSL258X_STA_ADC_VALID) != TSL258X_STA_ADC_VALID) {
376 dev_err(&chip->client->dev,
377 "taos_als_calibrate failed: STATUS - ADC not valid.\n");
380 lux_val = taos_get_lux(indio_dev);
382 dev_err(&chip->client->dev, "taos_als_calibrate failed to get lux\n");
385 gain_trim_val = (unsigned int)(((chip->taos_settings.als_cal_target)
386 * chip->taos_settings.als_gain_trim) / lux_val);
388 if ((gain_trim_val < 250) || (gain_trim_val > 4000)) {
389 dev_err(&chip->client->dev,
390 "taos_als_calibrate failed: trim_val of %d is out of range\n",
394 chip->taos_settings.als_gain_trim = (int)gain_trim_val;
396 return (int)gain_trim_val;
400 * Turn the device on.
401 * Configuration must be set before calling this function.
403 static int taos_chip_on(struct iio_dev *indio_dev)
411 struct tsl2583_chip *chip = iio_priv(indio_dev);
413 /* and make sure we're not already on */
414 if (chip->taos_chip_status == TSL258X_CHIP_WORKING) {
415 /* if forcing a register update - turn off, then on */
416 dev_info(&chip->client->dev, "device is already enabled\n");
420 /* determine als integration register */
421 als_count = (chip->taos_settings.als_time * 100 + 135) / 270;
423 als_count = 1; /* ensure at least one cycle */
425 /* convert back to time (encompasses overrides) */
426 als_time = (als_count * 27 + 5) / 10;
427 chip->taos_config[TSL258X_ALS_TIME] = 256 - als_count;
429 /* Set the gain based on taos_settings struct */
430 chip->taos_config[TSL258X_GAIN] = chip->taos_settings.als_gain;
432 /* set chip struct re scaling and saturation */
433 chip->als_saturation = als_count * 922; /* 90% of full scale */
434 chip->als_time_scale = (als_time + 25) / 50;
437 * TSL258x Specific power-on / adc enable sequence
438 * Power on the device 1st.
440 utmp = TSL258X_CNTL_PWR_ON;
441 ret = i2c_smbus_write_byte_data(chip->client,
442 TSL258X_CMD_REG | TSL258X_CNTRL, utmp);
444 dev_err(&chip->client->dev, "taos_chip_on failed on CNTRL reg.\n");
449 * Use the following shadow copy for our delay before enabling ADC.
450 * Write all the registers.
452 for (i = 0, uP = chip->taos_config; i < TSL258X_REG_MAX; i++) {
453 ret = i2c_smbus_write_byte_data(chip->client,
457 dev_err(&chip->client->dev,
458 "taos_chip_on failed on reg %d.\n", i);
463 usleep_range(3000, 3500);
466 * initialize the desired mode of operation
468 utmp = TSL258X_CNTL_PWR_ON | TSL258X_CNTL_ADC_ENBL;
469 ret = i2c_smbus_write_byte_data(chip->client,
470 TSL258X_CMD_REG | TSL258X_CNTRL,
473 dev_err(&chip->client->dev, "taos_chip_on failed on 2nd CTRL reg.\n");
476 chip->taos_chip_status = TSL258X_CHIP_WORKING;
481 static int taos_chip_off(struct iio_dev *indio_dev)
483 struct tsl2583_chip *chip = iio_priv(indio_dev);
485 /* turn device off */
486 chip->taos_chip_status = TSL258X_CHIP_SUSPENDED;
487 return i2c_smbus_write_byte_data(chip->client,
488 TSL258X_CMD_REG | TSL258X_CNTRL,
492 /* Sysfs Interface Functions */
494 static ssize_t taos_power_state_show(struct device *dev,
495 struct device_attribute *attr, char *buf)
497 struct iio_dev *indio_dev = dev_to_iio_dev(dev);
498 struct tsl2583_chip *chip = iio_priv(indio_dev);
500 return sprintf(buf, "%d\n", chip->taos_chip_status);
503 static ssize_t taos_power_state_store(struct device *dev,
504 struct device_attribute *attr,
505 const char *buf, size_t len)
507 struct iio_dev *indio_dev = dev_to_iio_dev(dev);
510 if (kstrtoint(buf, 0, &value))
514 taos_chip_off(indio_dev);
516 taos_chip_on(indio_dev);
521 static ssize_t taos_gain_show(struct device *dev,
522 struct device_attribute *attr, char *buf)
524 struct iio_dev *indio_dev = dev_to_iio_dev(dev);
525 struct tsl2583_chip *chip = iio_priv(indio_dev);
528 switch (chip->taos_settings.als_gain) {
543 return sprintf(buf, "%s\n", gain);
546 static ssize_t taos_gain_store(struct device *dev,
547 struct device_attribute *attr,
548 const char *buf, size_t len)
550 struct iio_dev *indio_dev = dev_to_iio_dev(dev);
551 struct tsl2583_chip *chip = iio_priv(indio_dev);
554 if (kstrtoint(buf, 0, &value))
559 chip->taos_settings.als_gain = 0;
562 chip->taos_settings.als_gain = 1;
565 chip->taos_settings.als_gain = 2;
568 chip->taos_settings.als_gain = 3;
571 dev_err(dev, "Invalid Gain Index (must be 1,8,16,111)\n");
578 static ssize_t taos_gain_available_show(struct device *dev,
579 struct device_attribute *attr,
582 return sprintf(buf, "%s\n", "1 8 16 111");
585 static ssize_t taos_als_time_show(struct device *dev,
586 struct device_attribute *attr, char *buf)
588 struct iio_dev *indio_dev = dev_to_iio_dev(dev);
589 struct tsl2583_chip *chip = iio_priv(indio_dev);
591 return sprintf(buf, "%d\n", chip->taos_settings.als_time);
594 static ssize_t taos_als_time_store(struct device *dev,
595 struct device_attribute *attr,
596 const char *buf, size_t len)
598 struct iio_dev *indio_dev = dev_to_iio_dev(dev);
599 struct tsl2583_chip *chip = iio_priv(indio_dev);
602 if (kstrtoint(buf, 0, &value))
605 if ((value < 50) || (value > 650))
611 chip->taos_settings.als_time = value;
616 static ssize_t taos_als_time_available_show(struct device *dev,
617 struct device_attribute *attr,
620 return sprintf(buf, "%s\n",
621 "50 100 150 200 250 300 350 400 450 500 550 600 650");
624 static ssize_t taos_als_trim_show(struct device *dev,
625 struct device_attribute *attr, char *buf)
627 struct iio_dev *indio_dev = dev_to_iio_dev(dev);
628 struct tsl2583_chip *chip = iio_priv(indio_dev);
630 return sprintf(buf, "%d\n", chip->taos_settings.als_gain_trim);
633 static ssize_t taos_als_trim_store(struct device *dev,
634 struct device_attribute *attr,
635 const char *buf, size_t len)
637 struct iio_dev *indio_dev = dev_to_iio_dev(dev);
638 struct tsl2583_chip *chip = iio_priv(indio_dev);
641 if (kstrtoint(buf, 0, &value))
645 chip->taos_settings.als_gain_trim = value;
650 static ssize_t taos_als_cal_target_show(struct device *dev,
651 struct device_attribute *attr,
654 struct iio_dev *indio_dev = dev_to_iio_dev(dev);
655 struct tsl2583_chip *chip = iio_priv(indio_dev);
657 return sprintf(buf, "%d\n", chip->taos_settings.als_cal_target);
660 static ssize_t taos_als_cal_target_store(struct device *dev,
661 struct device_attribute *attr,
662 const char *buf, size_t len)
664 struct iio_dev *indio_dev = dev_to_iio_dev(dev);
665 struct tsl2583_chip *chip = iio_priv(indio_dev);
668 if (kstrtoint(buf, 0, &value))
672 chip->taos_settings.als_cal_target = value;
677 static ssize_t taos_lux_show(struct device *dev, struct device_attribute *attr,
682 ret = taos_get_lux(dev_to_iio_dev(dev));
686 return sprintf(buf, "%d\n", ret);
689 static ssize_t taos_do_calibrate(struct device *dev,
690 struct device_attribute *attr,
691 const char *buf, size_t len)
693 struct iio_dev *indio_dev = dev_to_iio_dev(dev);
696 if (kstrtoint(buf, 0, &value))
700 taos_als_calibrate(indio_dev);
705 static ssize_t taos_luxtable_show(struct device *dev,
706 struct device_attribute *attr, char *buf)
711 for (i = 0; i < ARRAY_SIZE(taos_device_lux); i++) {
712 offset += sprintf(buf + offset, "%u,%u,%u,",
713 taos_device_lux[i].ratio,
714 taos_device_lux[i].ch0,
715 taos_device_lux[i].ch1);
716 if (taos_device_lux[i].ratio == 0) {
718 * We just printed the first "0" entry.
719 * Now get rid of the extra "," and break.
726 offset += sprintf(buf + offset, "\n");
730 static ssize_t taos_luxtable_store(struct device *dev,
731 struct device_attribute *attr,
732 const char *buf, size_t len)
734 struct iio_dev *indio_dev = dev_to_iio_dev(dev);
735 struct tsl2583_chip *chip = iio_priv(indio_dev);
736 int value[ARRAY_SIZE(taos_device_lux) * 3 + 1];
739 get_options(buf, ARRAY_SIZE(value), value);
741 /* We now have an array of ints starting at value[1], and
742 * enumerated by value[0].
743 * We expect each group of three ints is one table entry,
744 * and the last table entry is all 0.
747 if ((n % 3) || n < 6 || n > ((ARRAY_SIZE(taos_device_lux) - 1) * 3)) {
748 dev_info(dev, "LUX TABLE INPUT ERROR 1 Value[0]=%d\n", n);
751 if ((value[(n - 2)] | value[(n - 1)] | value[n]) != 0) {
752 dev_info(dev, "LUX TABLE INPUT ERROR 2 Value[0]=%d\n", n);
756 if (chip->taos_chip_status == TSL258X_CHIP_WORKING)
757 taos_chip_off(indio_dev);
759 /* Zero out the table */
760 memset(taos_device_lux, 0, sizeof(taos_device_lux));
761 memcpy(taos_device_lux, &value[1], (value[0] * 4));
763 taos_chip_on(indio_dev);
768 static DEVICE_ATTR(power_state, S_IRUGO | S_IWUSR,
769 taos_power_state_show, taos_power_state_store);
771 static DEVICE_ATTR(illuminance0_calibscale, S_IRUGO | S_IWUSR,
772 taos_gain_show, taos_gain_store);
773 static DEVICE_ATTR(illuminance0_calibscale_available, S_IRUGO,
774 taos_gain_available_show, NULL);
776 static DEVICE_ATTR(illuminance0_integration_time, S_IRUGO | S_IWUSR,
777 taos_als_time_show, taos_als_time_store);
778 static DEVICE_ATTR(illuminance0_integration_time_available, S_IRUGO,
779 taos_als_time_available_show, NULL);
781 static DEVICE_ATTR(illuminance0_calibbias, S_IRUGO | S_IWUSR,
782 taos_als_trim_show, taos_als_trim_store);
784 static DEVICE_ATTR(illuminance0_input_target, S_IRUGO | S_IWUSR,
785 taos_als_cal_target_show, taos_als_cal_target_store);
787 static DEVICE_ATTR(illuminance0_input, S_IRUGO, taos_lux_show, NULL);
788 static DEVICE_ATTR(illuminance0_calibrate, S_IWUSR, NULL, taos_do_calibrate);
789 static DEVICE_ATTR(illuminance0_lux_table, S_IRUGO | S_IWUSR,
790 taos_luxtable_show, taos_luxtable_store);
792 static struct attribute *sysfs_attrs_ctrl[] = {
793 &dev_attr_power_state.attr,
794 &dev_attr_illuminance0_calibscale.attr, /* Gain */
795 &dev_attr_illuminance0_calibscale_available.attr,
796 &dev_attr_illuminance0_integration_time.attr, /* I time*/
797 &dev_attr_illuminance0_integration_time_available.attr,
798 &dev_attr_illuminance0_calibbias.attr, /* trim */
799 &dev_attr_illuminance0_input_target.attr,
800 &dev_attr_illuminance0_input.attr,
801 &dev_attr_illuminance0_calibrate.attr,
802 &dev_attr_illuminance0_lux_table.attr,
806 static const struct attribute_group tsl2583_attribute_group = {
807 .attrs = sysfs_attrs_ctrl,
810 /* Use the default register values to identify the Taos device */
811 static int taos_tsl258x_device(unsigned char *bufp)
813 return ((bufp[TSL258X_CHIPID] & 0xf0) == 0x90);
816 static const struct iio_info tsl2583_info = {
817 .attrs = &tsl2583_attribute_group,
818 .driver_module = THIS_MODULE,
822 * Client probe function - When a valid device is found, the driver's device
823 * data structure is updated, and initialization completes successfully.
825 static int taos_probe(struct i2c_client *clientp,
826 const struct i2c_device_id *idp)
829 unsigned char buf[TSL258X_MAX_DEVICE_REGS];
830 struct tsl2583_chip *chip;
831 struct iio_dev *indio_dev;
833 if (!i2c_check_functionality(clientp->adapter,
834 I2C_FUNC_SMBUS_BYTE_DATA)) {
835 dev_err(&clientp->dev, "taos_probe() - i2c smbus byte data func unsupported\n");
839 indio_dev = devm_iio_device_alloc(&clientp->dev, sizeof(*chip));
842 chip = iio_priv(indio_dev);
843 chip->client = clientp;
844 i2c_set_clientdata(clientp, indio_dev);
846 mutex_init(&chip->als_mutex);
847 chip->taos_chip_status = TSL258X_CHIP_UNKNOWN;
848 memcpy(chip->taos_config, taos_config, sizeof(chip->taos_config));
850 for (i = 0; i < TSL258X_MAX_DEVICE_REGS; i++) {
851 ret = i2c_smbus_write_byte(clientp,
852 (TSL258X_CMD_REG | (TSL258X_CNTRL + i)));
854 dev_err(&clientp->dev,
855 "i2c_smbus_write_byte to cmd reg failed in taos_probe(), err = %d\n",
859 ret = i2c_smbus_read_byte(clientp);
861 dev_err(&clientp->dev,
862 "i2c_smbus_read_byte from reg failed in taos_probe(), err = %d\n",
869 if (!taos_tsl258x_device(buf)) {
870 dev_info(&clientp->dev,
871 "i2c device found but does not match expected id in taos_probe()\n");
875 ret = i2c_smbus_write_byte(clientp, (TSL258X_CMD_REG | TSL258X_CNTRL));
877 dev_err(&clientp->dev,
878 "i2c_smbus_write_byte() to cmd reg failed in taos_probe(), err = %d\n",
883 indio_dev->info = &tsl2583_info;
884 indio_dev->dev.parent = &clientp->dev;
885 indio_dev->modes = INDIO_DIRECT_MODE;
886 indio_dev->name = chip->client->name;
887 ret = devm_iio_device_register(indio_dev->dev.parent, indio_dev);
889 dev_err(&clientp->dev, "iio registration failed\n");
893 /* Load up the V2 defaults (these are hard coded defaults for now) */
896 /* Make sure the chip is on */
897 taos_chip_on(indio_dev);
899 dev_info(&clientp->dev, "Light sensor found.\n");
903 #ifdef CONFIG_PM_SLEEP
904 static int taos_suspend(struct device *dev)
906 struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
907 struct tsl2583_chip *chip = iio_priv(indio_dev);
910 mutex_lock(&chip->als_mutex);
912 if (chip->taos_chip_status == TSL258X_CHIP_WORKING) {
913 ret = taos_chip_off(indio_dev);
914 chip->taos_chip_status = TSL258X_CHIP_SUSPENDED;
917 mutex_unlock(&chip->als_mutex);
921 static int taos_resume(struct device *dev)
923 struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
924 struct tsl2583_chip *chip = iio_priv(indio_dev);
927 mutex_lock(&chip->als_mutex);
929 if (chip->taos_chip_status == TSL258X_CHIP_SUSPENDED)
930 ret = taos_chip_on(indio_dev);
932 mutex_unlock(&chip->als_mutex);
936 static SIMPLE_DEV_PM_OPS(taos_pm_ops, taos_suspend, taos_resume);
937 #define TAOS_PM_OPS (&taos_pm_ops)
939 #define TAOS_PM_OPS NULL
942 static struct i2c_device_id taos_idtable[] = {
948 MODULE_DEVICE_TABLE(i2c, taos_idtable);
950 /* Driver definition */
951 static struct i2c_driver taos_driver = {
956 .id_table = taos_idtable,
959 module_i2c_driver(taos_driver);
962 MODULE_DESCRIPTION("TAOS tsl2583 ambient light sensor driver");
963 MODULE_LICENSE("GPL");