tsl2583.c

  1// SPDX-License-Identifier: GPL-2.0-or-later
  2/*
  3 * Device driver for monitoring ambient light intensity (lux)
  4 * within the TAOS tsl258x family of devices (tsl2580, tsl2581, tsl2583).
  5 *
  6 * Copyright (c) 2011, TAOS Corporation.
  7 * Copyright (c) 2016-2017 Brian Masney <masneyb@onstation.org>
  8 */
  9
 10#include <linux/kernel.h>
 11#include <linux/i2c.h>
 12#include <linux/errno.h>
 13#include <linux/delay.h>
 14#include <linux/string.h>
 15#include <linux/mutex.h>
 16#include <linux/unistd.h>
 17#include <linux/slab.h>
 18#include <linux/module.h>
 19#include <linux/iio/iio.h>
 20#include <linux/iio/sysfs.h>
 21#include <linux/pm_runtime.h>
 22
 23/* Device Registers and Masks */
 24#define TSL2583_CNTRL			0x00
 25#define TSL2583_ALS_TIME		0X01
 26#define TSL2583_INTERRUPT		0x02
 27#define TSL2583_GAIN			0x07
 28#define TSL2583_REVID			0x11
 29#define TSL2583_CHIPID			0x12
 30#define TSL2583_ALS_CHAN0LO		0x14
 31#define TSL2583_ALS_CHAN0HI		0x15
 32#define TSL2583_ALS_CHAN1LO		0x16
 33#define TSL2583_ALS_CHAN1HI		0x17
 34#define TSL2583_TMR_LO			0x18
 35#define TSL2583_TMR_HI			0x19
 36
 37/* tsl2583 cmd reg masks */
 38#define TSL2583_CMD_REG			0x80
 39#define TSL2583_CMD_SPL_FN		0x60
 40#define TSL2583_CMD_ALS_INT_CLR		0x01
 41
 42/* tsl2583 cntrl reg masks */
 43#define TSL2583_CNTL_ADC_ENBL		0x02
 44#define TSL2583_CNTL_PWR_OFF		0x00
 45#define TSL2583_CNTL_PWR_ON		0x01
 46
 47/* tsl2583 status reg masks */
 48#define TSL2583_STA_ADC_VALID		0x01
 49#define TSL2583_STA_ADC_INTR		0x10
 50
 51/* Lux calculation constants */
 52#define TSL2583_LUX_CALC_OVER_FLOW	65535
 53
 54#define TSL2583_INTERRUPT_DISABLED	0x00
 55
 56#define TSL2583_CHIP_ID			0x90
 57#define TSL2583_CHIP_ID_MASK		0xf0
 58
 59#define TSL2583_POWER_OFF_DELAY_MS	2000
 60
 61/* Per-device data */
 62struct tsl2583_als_info {
 63	u16 als_ch0;
 64	u16 als_ch1;
 65	u16 lux;
 66};
 67
 68struct tsl2583_lux {
 69	unsigned int ratio;
 70	unsigned int ch0;
 71	unsigned int ch1;
 72};
 73
 74static const struct tsl2583_lux tsl2583_default_lux[] = {
 75	{  9830,  8520, 15729 },
 76	{ 12452, 10807, 23344 },
 77	{ 14746,  6383, 11705 },
 78	{ 17695,  4063,  6554 },
 79	{     0,     0,     0 }  /* Termination segment */
 80};
 81
 82#define TSL2583_MAX_LUX_TABLE_ENTRIES 11
 83
 84struct tsl2583_settings {
 85	int als_time;
 86	int als_gain;
 87	int als_gain_trim;
 88	int als_cal_target;
 89
 90	/*
 91	 * This structure is intentionally large to accommodate updates via
 92	 * sysfs. Sized to 11 = max 10 segments + 1 termination segment.
 93	 * Assumption is that one and only one type of glass used.
 94	 */
 95	struct tsl2583_lux als_device_lux[TSL2583_MAX_LUX_TABLE_ENTRIES];
 96};
 97
 98struct tsl2583_chip {
 99	struct mutex als_mutex;
100	struct i2c_client *client;
101	struct tsl2583_als_info als_cur_info;
102	struct tsl2583_settings als_settings;
103	int als_time_scale;
104	int als_saturation;
105};
106
107struct gainadj {
108	s16 ch0;
109	s16 ch1;
110	s16 mean;
111};
112
113/* Index = (0 - 3) Used to validate the gain selection index */
114static const struct gainadj gainadj[] = {
115	{ 1, 1, 1 },
116	{ 8, 8, 8 },
117	{ 16, 16, 16 },
118	{ 107, 115, 111 }
119};
120
121/*
122 * Provides initial operational parameter defaults.
123 * These defaults may be changed through the device's sysfs files.
124 */
125static void tsl2583_defaults(struct tsl2583_chip *chip)
126{
127	/*
128	 * The integration time must be a multiple of 50ms and within the
129	 * range [50, 600] ms.
130	 */
131	chip->als_settings.als_time = 100;
132
133	/*
134	 * This is an index into the gainadj table. Assume clear glass as the
135	 * default.
136	 */
137	chip->als_settings.als_gain = 0;
138
139	/* Default gain trim to account for aperture effects */
140	chip->als_settings.als_gain_trim = 1000;
141
142	/* Known external ALS reading used for calibration */
143	chip->als_settings.als_cal_target = 130;
144
145	/* Default lux table. */
146	memcpy(chip->als_settings.als_device_lux, tsl2583_default_lux,
147	       sizeof(tsl2583_default_lux));
148}
149
150/*
151 * Reads and calculates current lux value.
152 * The raw ch0 and ch1 values of the ambient light sensed in the last
153 * integration cycle are read from the device.
154 * Time scale factor array values are adjusted based on the integration time.
155 * The raw values are multiplied by a scale factor, and device gain is obtained
156 * using gain index. Limit checks are done next, then the ratio of a multiple
157 * of ch1 value, to the ch0 value, is calculated. The array als_device_lux[]
158 * declared above is then scanned to find the first ratio value that is just
159 * above the ratio we just calculated. The ch0 and ch1 multiplier constants in
160 * the array are then used along with the time scale factor array values, to
161 * calculate the lux.
162 */
163static int tsl2583_get_lux(struct iio_dev *indio_dev)
164{
165	u16 ch0, ch1; /* separated ch0/ch1 data from device */
166	u32 lux; /* raw lux calculated from device data */
167	u64 lux64;
168	u32 ratio;
169	u8 buf[5];
170	struct tsl2583_lux *p;
171	struct tsl2583_chip *chip = iio_priv(indio_dev);
172	int i, ret;
173
174	ret = i2c_smbus_read_byte_data(chip->client, TSL2583_CMD_REG);
175	if (ret < 0) {
176		dev_err(&chip->client->dev, "%s: failed to read CMD_REG register\n",
177			__func__);
178		goto done;
179	}
180
181	/* is data new & valid */
182	if (!(ret & TSL2583_STA_ADC_INTR)) {
183		dev_err(&chip->client->dev, "%s: data not valid; returning last value\n",
184			__func__);
185		ret = chip->als_cur_info.lux; /* return LAST VALUE */
186		goto done;
187	}
188
189	for (i = 0; i < 4; i++) {
190		int reg = TSL2583_CMD_REG | (TSL2583_ALS_CHAN0LO + i);
191
192		ret = i2c_smbus_read_byte_data(chip->client, reg);
193		if (ret < 0) {
194			dev_err(&chip->client->dev, "%s: failed to read register %x\n",
195				__func__, reg);
196			goto done;
197		}
198		buf[i] = ret;
199	}
200
201	/*
202	 * Clear the pending interrupt status bit on the chip to allow the next
203	 * integration cycle to start. This has to be done even though this
204	 * driver currently does not support interrupts.
205	 */
206	ret = i2c_smbus_write_byte(chip->client,
207				   (TSL2583_CMD_REG | TSL2583_CMD_SPL_FN |
208				    TSL2583_CMD_ALS_INT_CLR));
209	if (ret < 0) {
210		dev_err(&chip->client->dev, "%s: failed to clear the interrupt bit\n",
211			__func__);
212		goto done; /* have no data, so return failure */
213	}
214
215	/* extract ALS/lux data */
216	ch0 = le16_to_cpup((const __le16 *)&buf[0]);
217	ch1 = le16_to_cpup((const __le16 *)&buf[2]);
218
219	chip->als_cur_info.als_ch0 = ch0;
220	chip->als_cur_info.als_ch1 = ch1;
221
222	if ((ch0 >= chip->als_saturation) || (ch1 >= chip->als_saturation))
223		goto return_max;
224
225	if (!ch0) {
226		/*
227		 * The sensor appears to be in total darkness so set the
228		 * calculated lux to 0 and return early to avoid a division by
229		 * zero below when calculating the ratio.
230		 */
231		ret = 0;
232		chip->als_cur_info.lux = 0;
233		goto done;
234	}
235
236	/* calculate ratio */
237	ratio = (ch1 << 15) / ch0;
238
239	/* convert to unscaled lux using the pointer to the table */
240	for (p = (struct tsl2583_lux *)chip->als_settings.als_device_lux;
241	     p->ratio != 0 && p->ratio < ratio; p++)
242		;
243
244	if (p->ratio == 0) {
245		lux = 0;
246	} else {
247		u32 ch0lux, ch1lux;
248
249		ch0lux = ((ch0 * p->ch0) +
250			  (gainadj[chip->als_settings.als_gain].ch0 >> 1))
251			 / gainadj[chip->als_settings.als_gain].ch0;
252		ch1lux = ((ch1 * p->ch1) +
253			  (gainadj[chip->als_settings.als_gain].ch1 >> 1))
254			 / gainadj[chip->als_settings.als_gain].ch1;
255
256		/* note: lux is 31 bit max at this point */
257		if (ch1lux > ch0lux) {
258			dev_dbg(&chip->client->dev, "%s: No Data - Returning 0\n",
259				__func__);
260			ret = 0;
261			chip->als_cur_info.lux = 0;
262			goto done;
263		}
264
265		lux = ch0lux - ch1lux;
266	}
267
268	/* adjust for active time scale */
269	if (chip->als_time_scale == 0)
270		lux = 0;
271	else
272		lux = (lux + (chip->als_time_scale >> 1)) /
273			chip->als_time_scale;
274
275	/*
276	 * Adjust for active gain scale.
277	 * The tsl2583_default_lux tables above have a factor of 8192 built in,
278	 * so we need to shift right.
279	 * User-specified gain provides a multiplier.
280	 * Apply user-specified gain before shifting right to retain precision.
281	 * Use 64 bits to avoid overflow on multiplication.
282	 * Then go back to 32 bits before division to avoid using div_u64().
283	 */
284	lux64 = lux;
285	lux64 = lux64 * chip->als_settings.als_gain_trim;
286	lux64 >>= 13;
287	lux = lux64;
288	lux = DIV_ROUND_CLOSEST(lux, 1000);
289
290	if (lux > TSL2583_LUX_CALC_OVER_FLOW) { /* check for overflow */
291return_max:
292		lux = TSL2583_LUX_CALC_OVER_FLOW;
293	}
294
295	/* Update the structure with the latest VALID lux. */
296	chip->als_cur_info.lux = lux;
297	ret = lux;
298
299done:
300	return ret;
301}
302
303/*
304 * Obtain single reading and calculate the als_gain_trim (later used
305 * to derive actual lux).
306 * Return updated gain_trim value.
307 */
308static int tsl2583_als_calibrate(struct iio_dev *indio_dev)
309{
310	struct tsl2583_chip *chip = iio_priv(indio_dev);
311	unsigned int gain_trim_val;
312	int ret;
313	int lux_val;
314
315	ret = i2c_smbus_read_byte_data(chip->client,
316				       TSL2583_CMD_REG | TSL2583_CNTRL);
317	if (ret < 0) {
318		dev_err(&chip->client->dev,
319			"%s: failed to read from the CNTRL register\n",
320			__func__);
321		return ret;
322	}
323
324	if ((ret & (TSL2583_CNTL_ADC_ENBL | TSL2583_CNTL_PWR_ON))
325			!= (TSL2583_CNTL_ADC_ENBL | TSL2583_CNTL_PWR_ON)) {
326		dev_err(&chip->client->dev,
327			"%s: Device is not powered on and/or ADC is not enabled\n",
328			__func__);
329		return -EINVAL;
330	} else if ((ret & TSL2583_STA_ADC_VALID) != TSL2583_STA_ADC_VALID) {
331		dev_err(&chip->client->dev,
332			"%s: The two ADC channels have not completed an integration cycle\n",
333			__func__);
334		return -ENODATA;
335	}
336
337	lux_val = tsl2583_get_lux(indio_dev);
338	if (lux_val < 0) {
339		dev_err(&chip->client->dev, "%s: failed to get lux\n",
340			__func__);
341		return lux_val;
342	}
343
344	/* Avoid division by zero of lux_value later on */
345	if (lux_val == 0) {
346		dev_err(&chip->client->dev,
347			"%s: lux_val of 0 will produce out of range trim_value\n",
348			__func__);
349		return -ENODATA;
350	}
351
352	gain_trim_val = (unsigned int)(((chip->als_settings.als_cal_target)
353			* chip->als_settings.als_gain_trim) / lux_val);
354	if ((gain_trim_val < 250) || (gain_trim_val > 4000)) {
355		dev_err(&chip->client->dev,
356			"%s: trim_val of %d is not within the range [250, 4000]\n",
357			__func__, gain_trim_val);
358		return -ENODATA;
359	}
360
361	chip->als_settings.als_gain_trim = (int)gain_trim_val;
362
363	return 0;
364}
365
366static int tsl2583_set_als_time(struct tsl2583_chip *chip)
367{
368	int als_count, als_time, ret;
369	u8 val;
370
371	/* determine als integration register */
372	als_count = DIV_ROUND_CLOSEST(chip->als_settings.als_time * 100, 270);
373	if (!als_count)
374		als_count = 1; /* ensure at least one cycle */
375
376	/* convert back to time (encompasses overrides) */
377	als_time = DIV_ROUND_CLOSEST(als_count * 27, 10);
378
379	val = 256 - als_count;
380	ret = i2c_smbus_write_byte_data(chip->client,
381					TSL2583_CMD_REG | TSL2583_ALS_TIME,
382					val);
383	if (ret < 0) {
384		dev_err(&chip->client->dev, "%s: failed to set the als time to %d\n",
385			__func__, val);
386		return ret;
387	}
388
389	/* set chip struct re scaling and saturation */
390	chip->als_saturation = als_count * 922; /* 90% of full scale */
391	chip->als_time_scale = DIV_ROUND_CLOSEST(als_time, 50);
392
393	return ret;
394}
395
396static int tsl2583_set_als_gain(struct tsl2583_chip *chip)
397{
398	int ret;
399
400	/* Set the gain based on als_settings struct */
401	ret = i2c_smbus_write_byte_data(chip->client,
402					TSL2583_CMD_REG | TSL2583_GAIN,
403					chip->als_settings.als_gain);
404	if (ret < 0)
405		dev_err(&chip->client->dev,
406			"%s: failed to set the gain to %d\n", __func__,
407			chip->als_settings.als_gain);
408
409	return ret;
410}
411
412static int tsl2583_set_power_state(struct tsl2583_chip *chip, u8 state)
413{
414	int ret;
415
416	ret = i2c_smbus_write_byte_data(chip->client,
417					TSL2583_CMD_REG | TSL2583_CNTRL, state);
418	if (ret < 0)
419		dev_err(&chip->client->dev,
420			"%s: failed to set the power state to %d\n", __func__,
421			state);
422
423	return ret;
424}
425
426/*
427 * Turn the device on.
428 * Configuration must be set before calling this function.
429 */
430static int tsl2583_chip_init_and_power_on(struct iio_dev *indio_dev)
431{
432	struct tsl2583_chip *chip = iio_priv(indio_dev);
433	int ret;
434
435	/* Power on the device; ADC off. */
436	ret = tsl2583_set_power_state(chip, TSL2583_CNTL_PWR_ON);
437	if (ret < 0)
438		return ret;
439
440	ret = i2c_smbus_write_byte_data(chip->client,
441					TSL2583_CMD_REG | TSL2583_INTERRUPT,
442					TSL2583_INTERRUPT_DISABLED);
443	if (ret < 0) {
444		dev_err(&chip->client->dev,
445			"%s: failed to disable interrupts\n", __func__);
446		return ret;
447	}
448
449	ret = tsl2583_set_als_time(chip);
450	if (ret < 0)
451		return ret;
452
453	ret = tsl2583_set_als_gain(chip);
454	if (ret < 0)
455		return ret;
456
457	usleep_range(3000, 3500);
458
459	ret = tsl2583_set_power_state(chip, TSL2583_CNTL_PWR_ON |
460					    TSL2583_CNTL_ADC_ENBL);
461	if (ret < 0)
462		return ret;
463
464	return ret;
465}
466
467/* Sysfs Interface Functions */
468
469static ssize_t in_illuminance_input_target_show(struct device *dev,
470						struct device_attribute *attr,
471						char *buf)
472{
473	struct iio_dev *indio_dev = dev_to_iio_dev(dev);
474	struct tsl2583_chip *chip = iio_priv(indio_dev);
475	int ret;
476
477	mutex_lock(&chip->als_mutex);
478	ret = sprintf(buf, "%d\n", chip->als_settings.als_cal_target);
479	mutex_unlock(&chip->als_mutex);
480
481	return ret;
482}
483
484static ssize_t in_illuminance_input_target_store(struct device *dev,
485						 struct device_attribute *attr,
486						 const char *buf, size_t len)
487{
488	struct iio_dev *indio_dev = dev_to_iio_dev(dev);
489	struct tsl2583_chip *chip = iio_priv(indio_dev);
490	int value;
491
492	if (kstrtoint(buf, 0, &value) || !value)
493		return -EINVAL;
494
495	mutex_lock(&chip->als_mutex);
496	chip->als_settings.als_cal_target = value;
497	mutex_unlock(&chip->als_mutex);
498
499	return len;
500}
501
502static ssize_t in_illuminance_calibrate_store(struct device *dev,
503					      struct device_attribute *attr,
504					      const char *buf, size_t len)
505{
506	struct iio_dev *indio_dev = dev_to_iio_dev(dev);
507	struct tsl2583_chip *chip = iio_priv(indio_dev);
508	int value, ret;
509
510	if (kstrtoint(buf, 0, &value) || value != 1)
511		return -EINVAL;
512
513	mutex_lock(&chip->als_mutex);
514
515	ret = tsl2583_als_calibrate(indio_dev);
516	if (ret < 0)
517		goto done;
518
519	ret = len;
520done:
521	mutex_unlock(&chip->als_mutex);
522
523	return ret;
524}
525
526static ssize_t in_illuminance_lux_table_show(struct device *dev,
527					     struct device_attribute *attr,
528					     char *buf)
529{
530	struct iio_dev *indio_dev = dev_to_iio_dev(dev);
531	struct tsl2583_chip *chip = iio_priv(indio_dev);
532	unsigned int i;
533	int offset = 0;
534
535	for (i = 0; i < ARRAY_SIZE(chip->als_settings.als_device_lux); i++) {
536		offset += sprintf(buf + offset, "%u,%u,%u,",
537				  chip->als_settings.als_device_lux[i].ratio,
538				  chip->als_settings.als_device_lux[i].ch0,
539				  chip->als_settings.als_device_lux[i].ch1);
540		if (chip->als_settings.als_device_lux[i].ratio == 0) {
541			/*
542			 * We just printed the first "0" entry.
543			 * Now get rid of the extra "," and break.
544			 */
545			offset--;
546			break;
547		}
548	}
549
550	offset += sprintf(buf + offset, "\n");
551
552	return offset;
553}
554
555static ssize_t in_illuminance_lux_table_store(struct device *dev,
556					      struct device_attribute *attr,
557					      const char *buf, size_t len)
558{
559	struct iio_dev *indio_dev = dev_to_iio_dev(dev);
560	struct tsl2583_chip *chip = iio_priv(indio_dev);
561	const unsigned int max_ints = TSL2583_MAX_LUX_TABLE_ENTRIES * 3;
562	int value[TSL2583_MAX_LUX_TABLE_ENTRIES * 3 + 1];
563	int ret = -EINVAL;
564	unsigned int n;
565
566	mutex_lock(&chip->als_mutex);
567
568	get_options(buf, ARRAY_SIZE(value), value);
569
570	/*
571	 * We now have an array of ints starting at value[1], and
572	 * enumerated by value[0].
573	 * We expect each group of three ints is one table entry,
574	 * and the last table entry is all 0.
575	 */
576	n = value[0];
577	if ((n % 3) || n < 6 || n > max_ints) {
578		dev_err(dev,
579			"%s: The number of entries in the lux table must be a multiple of 3 and within the range [6, %d]\n",
580			__func__, max_ints);
581		goto done;
582	}
583	if ((value[n - 2] | value[n - 1] | value[n]) != 0) {
584		dev_err(dev, "%s: The last 3 entries in the lux table must be zeros.\n",
585			__func__);
586		goto done;
587	}
588
589	memcpy(chip->als_settings.als_device_lux, &value[1],
590	       value[0] * sizeof(value[1]));
591
592	ret = len;
593
594done:
595	mutex_unlock(&chip->als_mutex);
596
597	return ret;
598}
599
600static IIO_CONST_ATTR(in_illuminance_calibscale_available, "1 8 16 111");
601static IIO_CONST_ATTR(in_illuminance_integration_time_available,
602		      "0.050 0.100 0.150 0.200 0.250 0.300 0.350 0.400 0.450 0.500 0.550 0.600 0.650");
603static IIO_DEVICE_ATTR_RW(in_illuminance_input_target, 0);
604static IIO_DEVICE_ATTR_WO(in_illuminance_calibrate, 0);
605static IIO_DEVICE_ATTR_RW(in_illuminance_lux_table, 0);
606
607static struct attribute *sysfs_attrs_ctrl[] = {
608	&iio_const_attr_in_illuminance_calibscale_available.dev_attr.attr,
609	&iio_const_attr_in_illuminance_integration_time_available.dev_attr.attr,
610	&iio_dev_attr_in_illuminance_input_target.dev_attr.attr,
611	&iio_dev_attr_in_illuminance_calibrate.dev_attr.attr,
612	&iio_dev_attr_in_illuminance_lux_table.dev_attr.attr,
613	NULL
614};
615
616static const struct attribute_group tsl2583_attribute_group = {
617	.attrs = sysfs_attrs_ctrl,
618};
619
620static const struct iio_chan_spec tsl2583_channels[] = {
621	{
622		.type = IIO_LIGHT,
623		.modified = 1,
624		.channel2 = IIO_MOD_LIGHT_IR,
625		.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
626	},
627	{
628		.type = IIO_LIGHT,
629		.modified = 1,
630		.channel2 = IIO_MOD_LIGHT_BOTH,
631		.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
632	},
633	{
634		.type = IIO_LIGHT,
635		.info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED) |
636				      BIT(IIO_CHAN_INFO_CALIBBIAS) |
637				      BIT(IIO_CHAN_INFO_CALIBSCALE) |
638				      BIT(IIO_CHAN_INFO_INT_TIME),
639	},
640};
641
642static int tsl2583_set_pm_runtime_busy(struct tsl2583_chip *chip, bool on)
643{
644	if (on)
645		return pm_runtime_resume_and_get(&chip->client->dev);
646
647	return pm_runtime_put_autosuspend(&chip->client->dev);
648}
649
650static int tsl2583_read_raw(struct iio_dev *indio_dev,
651			    struct iio_chan_spec const *chan,
652			    int *val, int *val2, long mask)
653{
654	struct tsl2583_chip *chip = iio_priv(indio_dev);
655	int ret, pm_ret;
656
657	ret = tsl2583_set_pm_runtime_busy(chip, true);
658	if (ret < 0)
659		return ret;
660
661	mutex_lock(&chip->als_mutex);
662
663	ret = -EINVAL;
664	switch (mask) {
665	case IIO_CHAN_INFO_RAW:
666		if (chan->type == IIO_LIGHT) {
667			ret = tsl2583_get_lux(indio_dev);
668			if (ret < 0)
669				goto read_done;
670
671			/*
672			 * From page 20 of the TSL2581, TSL2583 data
673			 * sheet (TAOS134 − MARCH 2011):
674			 *
675			 * One of the photodiodes (channel 0) is
676			 * sensitive to both visible and infrared light,
677			 * while the second photodiode (channel 1) is
678			 * sensitive primarily to infrared light.
679			 */
680			if (chan->channel2 == IIO_MOD_LIGHT_BOTH)
681				*val = chip->als_cur_info.als_ch0;
682			else
683				*val = chip->als_cur_info.als_ch1;
684
685			ret = IIO_VAL_INT;
686		}
687		break;
688	case IIO_CHAN_INFO_PROCESSED:
689		if (chan->type == IIO_LIGHT) {
690			ret = tsl2583_get_lux(indio_dev);
691			if (ret < 0)
692				goto read_done;
693
694			*val = ret;
695			ret = IIO_VAL_INT;
696		}
697		break;
698	case IIO_CHAN_INFO_CALIBBIAS:
699		if (chan->type == IIO_LIGHT) {
700			*val = chip->als_settings.als_gain_trim;
701			ret = IIO_VAL_INT;
702		}
703		break;
704	case IIO_CHAN_INFO_CALIBSCALE:
705		if (chan->type == IIO_LIGHT) {
706			*val = gainadj[chip->als_settings.als_gain].mean;
707			ret = IIO_VAL_INT;
708		}
709		break;
710	case IIO_CHAN_INFO_INT_TIME:
711		if (chan->type == IIO_LIGHT) {
712			*val = 0;
713			*val2 = chip->als_settings.als_time;
714			ret = IIO_VAL_INT_PLUS_MICRO;
715		}
716		break;
717	default:
718		break;
719	}
720
721read_done:
722	mutex_unlock(&chip->als_mutex);
723
724	if (ret < 0) {
725		tsl2583_set_pm_runtime_busy(chip, false);
726		return ret;
727	}
728
729	/*
730	 * Preserve the ret variable if the call to
731	 * tsl2583_set_pm_runtime_busy() is successful so the reading
732	 * (if applicable) is returned to user space.
733	 */
734	pm_ret = tsl2583_set_pm_runtime_busy(chip, false);
735	if (pm_ret < 0)
736		return pm_ret;
737
738	return ret;
739}
740
741static int tsl2583_write_raw(struct iio_dev *indio_dev,
742			     struct iio_chan_spec const *chan,
743			     int val, int val2, long mask)
744{
745	struct tsl2583_chip *chip = iio_priv(indio_dev);
746	int ret;
747
748	ret = tsl2583_set_pm_runtime_busy(chip, true);
749	if (ret < 0)
750		return ret;
751
752	mutex_lock(&chip->als_mutex);
753
754	ret = -EINVAL;
755	switch (mask) {
756	case IIO_CHAN_INFO_CALIBBIAS:
757		if (chan->type == IIO_LIGHT) {
758			chip->als_settings.als_gain_trim = val;
759			ret = 0;
760		}
761		break;
762	case IIO_CHAN_INFO_CALIBSCALE:
763		if (chan->type == IIO_LIGHT) {
764			unsigned int i;
765
766			for (i = 0; i < ARRAY_SIZE(gainadj); i++) {
767				if (gainadj[i].mean == val) {
768					chip->als_settings.als_gain = i;
769					ret = tsl2583_set_als_gain(chip);
770					break;
771				}
772			}
773		}
774		break;
775	case IIO_CHAN_INFO_INT_TIME:
776		if (chan->type == IIO_LIGHT && !val && val2 >= 50 &&
777		    val2 <= 650 && !(val2 % 50)) {
778			chip->als_settings.als_time = val2;
779			ret = tsl2583_set_als_time(chip);
780		}
781		break;
782	default:
783		break;
784	}
785
786	mutex_unlock(&chip->als_mutex);
787
788	if (ret < 0) {
789		tsl2583_set_pm_runtime_busy(chip, false);
790		return ret;
791	}
792
793	ret = tsl2583_set_pm_runtime_busy(chip, false);
794	if (ret < 0)
795		return ret;
796
797	return ret;
798}
799
800static const struct iio_info tsl2583_info = {
801	.attrs = &tsl2583_attribute_group,
802	.read_raw = tsl2583_read_raw,
803	.write_raw = tsl2583_write_raw,
804};
805
806static int tsl2583_probe(struct i2c_client *clientp)
807{
808	int ret;
809	struct tsl2583_chip *chip;
810	struct iio_dev *indio_dev;
811
812	if (!i2c_check_functionality(clientp->adapter,
813				     I2C_FUNC_SMBUS_BYTE_DATA)) {
814		dev_err(&clientp->dev, "%s: i2c smbus byte data functionality is unsupported\n",
815			__func__);
816		return -EOPNOTSUPP;
817	}
818
819	indio_dev = devm_iio_device_alloc(&clientp->dev, sizeof(*chip));
820	if (!indio_dev)
821		return -ENOMEM;
822
823	chip = iio_priv(indio_dev);
824	chip->client = clientp;
825	i2c_set_clientdata(clientp, indio_dev);
826
827	mutex_init(&chip->als_mutex);
828
829	ret = i2c_smbus_read_byte_data(clientp,
830				       TSL2583_CMD_REG | TSL2583_CHIPID);
831	if (ret < 0) {
832		dev_err(&clientp->dev,
833			"%s: failed to read the chip ID register\n", __func__);
834		return ret;
835	}
836
837	if ((ret & TSL2583_CHIP_ID_MASK) != TSL2583_CHIP_ID) {
838		dev_err(&clientp->dev, "%s: received an unknown chip ID %x\n",
839			__func__, ret);
840		return -EINVAL;
841	}
842
843	indio_dev->info = &tsl2583_info;
844	indio_dev->channels = tsl2583_channels;
845	indio_dev->num_channels = ARRAY_SIZE(tsl2583_channels);
846	indio_dev->modes = INDIO_DIRECT_MODE;
847	indio_dev->name = chip->client->name;
848
849	pm_runtime_enable(&clientp->dev);
850	pm_runtime_set_autosuspend_delay(&clientp->dev,
851					 TSL2583_POWER_OFF_DELAY_MS);
852	pm_runtime_use_autosuspend(&clientp->dev);
853
854	ret = iio_device_register(indio_dev);
855	if (ret) {
856		dev_err(&clientp->dev, "%s: iio registration failed\n",
857			__func__);
858		return ret;
859	}
860
861	/* Load up the V2 defaults (these are hard coded defaults for now) */
862	tsl2583_defaults(chip);
863
864	dev_info(&clientp->dev, "Light sensor found.\n");
865
866	return 0;
867}
868
869static void tsl2583_remove(struct i2c_client *client)
870{
871	struct iio_dev *indio_dev = i2c_get_clientdata(client);
872	struct tsl2583_chip *chip = iio_priv(indio_dev);
873
874	iio_device_unregister(indio_dev);
875
876	pm_runtime_disable(&client->dev);
877	pm_runtime_set_suspended(&client->dev);
878
879	tsl2583_set_power_state(chip, TSL2583_CNTL_PWR_OFF);
880}
881
882static int tsl2583_suspend(struct device *dev)
883{
884	struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
885	struct tsl2583_chip *chip = iio_priv(indio_dev);
886	int ret;
887
888	mutex_lock(&chip->als_mutex);
889
890	ret = tsl2583_set_power_state(chip, TSL2583_CNTL_PWR_OFF);
891
892	mutex_unlock(&chip->als_mutex);
893
894	return ret;
895}
896
897static int tsl2583_resume(struct device *dev)
898{
899	struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
900	struct tsl2583_chip *chip = iio_priv(indio_dev);
901	int ret;
902
903	mutex_lock(&chip->als_mutex);
904
905	ret = tsl2583_chip_init_and_power_on(indio_dev);
906
907	mutex_unlock(&chip->als_mutex);
908
909	return ret;
910}
911
912static DEFINE_RUNTIME_DEV_PM_OPS(tsl2583_pm_ops, tsl2583_suspend,
913				 tsl2583_resume, NULL);
914
915static const struct i2c_device_id tsl2583_idtable[] = {
916	{ "tsl2580", 0 },
917	{ "tsl2581", 1 },
918	{ "tsl2583", 2 },
919	{ }
920};
921MODULE_DEVICE_TABLE(i2c, tsl2583_idtable);
922
923static const struct of_device_id tsl2583_of_match[] = {
924	{ .compatible = "amstaos,tsl2580", },
925	{ .compatible = "amstaos,tsl2581", },
926	{ .compatible = "amstaos,tsl2583", },
927	{ }
928};
929MODULE_DEVICE_TABLE(of, tsl2583_of_match);
930
931/* Driver definition */
932static struct i2c_driver tsl2583_driver = {
933	.driver = {
934		.name = "tsl2583",
935		.pm = pm_ptr(&tsl2583_pm_ops),
936		.of_match_table = tsl2583_of_match,
937	},
938	.id_table = tsl2583_idtable,
939	.probe = tsl2583_probe,
940	.remove = tsl2583_remove,
941};
942module_i2c_driver(tsl2583_driver);
943
944MODULE_AUTHOR("J. August Brenner <jbrenner@taosinc.com>");
945MODULE_AUTHOR("Brian Masney <masneyb@onstation.org>");
946MODULE_DESCRIPTION("TAOS tsl2583 ambient light sensor driver");
947MODULE_LICENSE("GPL");