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(client: 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(client: chip->client, command: 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(client: chip->client,
207 value: (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(p: (const __le16 *)&buf[0]);
217 ch1 = le16_to_cpup(p: (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(client: 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(client: chip->client,
381 TSL2583_CMD_REG | TSL2583_ALS_TIME,
382 value: 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(client: chip->client,
402 TSL2583_CMD_REG | TSL2583_GAIN,
403 value: 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(client: chip->client,
417 TSL2583_CMD_REG | TSL2583_CNTRL, value: 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(client: 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(min: 3000, max: 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, fmt: "%d\n", chip->als_settings.als_cal_target);
479 mutex_unlock(lock: &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(s: buf, base: 0, res: &value) || !value)
493 return -EINVAL;
494
495 mutex_lock(&chip->als_mutex);
496 chip->als_settings.als_cal_target = value;
497 mutex_unlock(lock: &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(s: buf, base: 0, res: &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(lock: &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: buf + offset, fmt: "%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: buf + offset, fmt: "\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(str: buf, ARRAY_SIZE(value), ints: 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(lock: &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 int ret;
645
646 if (on) {
647 ret = pm_runtime_resume_and_get(dev: &chip->client->dev);
648 } else {
649 pm_runtime_mark_last_busy(dev: &chip->client->dev);
650 ret = pm_runtime_put_autosuspend(dev: &chip->client->dev);
651 }
652
653 return ret;
654}
655
656static int tsl2583_read_raw(struct iio_dev *indio_dev,
657 struct iio_chan_spec const *chan,
658 int *val, int *val2, long mask)
659{
660 struct tsl2583_chip *chip = iio_priv(indio_dev);
661 int ret, pm_ret;
662
663 ret = tsl2583_set_pm_runtime_busy(chip, on: true);
664 if (ret < 0)
665 return ret;
666
667 mutex_lock(&chip->als_mutex);
668
669 ret = -EINVAL;
670 switch (mask) {
671 case IIO_CHAN_INFO_RAW:
672 if (chan->type == IIO_LIGHT) {
673 ret = tsl2583_get_lux(indio_dev);
674 if (ret < 0)
675 goto read_done;
676
677 /*
678 * From page 20 of the TSL2581, TSL2583 data
679 * sheet (TAOS134 − MARCH 2011):
680 *
681 * One of the photodiodes (channel 0) is
682 * sensitive to both visible and infrared light,
683 * while the second photodiode (channel 1) is
684 * sensitive primarily to infrared light.
685 */
686 if (chan->channel2 == IIO_MOD_LIGHT_BOTH)
687 *val = chip->als_cur_info.als_ch0;
688 else
689 *val = chip->als_cur_info.als_ch1;
690
691 ret = IIO_VAL_INT;
692 }
693 break;
694 case IIO_CHAN_INFO_PROCESSED:
695 if (chan->type == IIO_LIGHT) {
696 ret = tsl2583_get_lux(indio_dev);
697 if (ret < 0)
698 goto read_done;
699
700 *val = ret;
701 ret = IIO_VAL_INT;
702 }
703 break;
704 case IIO_CHAN_INFO_CALIBBIAS:
705 if (chan->type == IIO_LIGHT) {
706 *val = chip->als_settings.als_gain_trim;
707 ret = IIO_VAL_INT;
708 }
709 break;
710 case IIO_CHAN_INFO_CALIBSCALE:
711 if (chan->type == IIO_LIGHT) {
712 *val = gainadj[chip->als_settings.als_gain].mean;
713 ret = IIO_VAL_INT;
714 }
715 break;
716 case IIO_CHAN_INFO_INT_TIME:
717 if (chan->type == IIO_LIGHT) {
718 *val = 0;
719 *val2 = chip->als_settings.als_time;
720 ret = IIO_VAL_INT_PLUS_MICRO;
721 }
722 break;
723 default:
724 break;
725 }
726
727read_done:
728 mutex_unlock(lock: &chip->als_mutex);
729
730 if (ret < 0) {
731 tsl2583_set_pm_runtime_busy(chip, on: false);
732 return ret;
733 }
734
735 /*
736 * Preserve the ret variable if the call to
737 * tsl2583_set_pm_runtime_busy() is successful so the reading
738 * (if applicable) is returned to user space.
739 */
740 pm_ret = tsl2583_set_pm_runtime_busy(chip, on: false);
741 if (pm_ret < 0)
742 return pm_ret;
743
744 return ret;
745}
746
747static int tsl2583_write_raw(struct iio_dev *indio_dev,
748 struct iio_chan_spec const *chan,
749 int val, int val2, long mask)
750{
751 struct tsl2583_chip *chip = iio_priv(indio_dev);
752 int ret;
753
754 ret = tsl2583_set_pm_runtime_busy(chip, on: true);
755 if (ret < 0)
756 return ret;
757
758 mutex_lock(&chip->als_mutex);
759
760 ret = -EINVAL;
761 switch (mask) {
762 case IIO_CHAN_INFO_CALIBBIAS:
763 if (chan->type == IIO_LIGHT) {
764 chip->als_settings.als_gain_trim = val;
765 ret = 0;
766 }
767 break;
768 case IIO_CHAN_INFO_CALIBSCALE:
769 if (chan->type == IIO_LIGHT) {
770 unsigned int i;
771
772 for (i = 0; i < ARRAY_SIZE(gainadj); i++) {
773 if (gainadj[i].mean == val) {
774 chip->als_settings.als_gain = i;
775 ret = tsl2583_set_als_gain(chip);
776 break;
777 }
778 }
779 }
780 break;
781 case IIO_CHAN_INFO_INT_TIME:
782 if (chan->type == IIO_LIGHT && !val && val2 >= 50 &&
783 val2 <= 650 && !(val2 % 50)) {
784 chip->als_settings.als_time = val2;
785 ret = tsl2583_set_als_time(chip);
786 }
787 break;
788 default:
789 break;
790 }
791
792 mutex_unlock(lock: &chip->als_mutex);
793
794 if (ret < 0) {
795 tsl2583_set_pm_runtime_busy(chip, on: false);
796 return ret;
797 }
798
799 ret = tsl2583_set_pm_runtime_busy(chip, on: false);
800 if (ret < 0)
801 return ret;
802
803 return ret;
804}
805
806static const struct iio_info tsl2583_info = {
807 .attrs = &tsl2583_attribute_group,
808 .read_raw = tsl2583_read_raw,
809 .write_raw = tsl2583_write_raw,
810};
811
812static int tsl2583_probe(struct i2c_client *clientp)
813{
814 int ret;
815 struct tsl2583_chip *chip;
816 struct iio_dev *indio_dev;
817
818 if (!i2c_check_functionality(adap: clientp->adapter,
819 I2C_FUNC_SMBUS_BYTE_DATA)) {
820 dev_err(&clientp->dev, "%s: i2c smbus byte data functionality is unsupported\n",
821 __func__);
822 return -EOPNOTSUPP;
823 }
824
825 indio_dev = devm_iio_device_alloc(parent: &clientp->dev, sizeof_priv: sizeof(*chip));
826 if (!indio_dev)
827 return -ENOMEM;
828
829 chip = iio_priv(indio_dev);
830 chip->client = clientp;
831 i2c_set_clientdata(client: clientp, data: indio_dev);
832
833 mutex_init(&chip->als_mutex);
834
835 ret = i2c_smbus_read_byte_data(client: clientp,
836 TSL2583_CMD_REG | TSL2583_CHIPID);
837 if (ret < 0) {
838 dev_err(&clientp->dev,
839 "%s: failed to read the chip ID register\n", __func__);
840 return ret;
841 }
842
843 if ((ret & TSL2583_CHIP_ID_MASK) != TSL2583_CHIP_ID) {
844 dev_err(&clientp->dev, "%s: received an unknown chip ID %x\n",
845 __func__, ret);
846 return -EINVAL;
847 }
848
849 indio_dev->info = &tsl2583_info;
850 indio_dev->channels = tsl2583_channels;
851 indio_dev->num_channels = ARRAY_SIZE(tsl2583_channels);
852 indio_dev->modes = INDIO_DIRECT_MODE;
853 indio_dev->name = chip->client->name;
854
855 pm_runtime_enable(dev: &clientp->dev);
856 pm_runtime_set_autosuspend_delay(dev: &clientp->dev,
857 TSL2583_POWER_OFF_DELAY_MS);
858 pm_runtime_use_autosuspend(dev: &clientp->dev);
859
860 ret = iio_device_register(indio_dev);
861 if (ret) {
862 dev_err(&clientp->dev, "%s: iio registration failed\n",
863 __func__);
864 return ret;
865 }
866
867 /* Load up the V2 defaults (these are hard coded defaults for now) */
868 tsl2583_defaults(chip);
869
870 dev_info(&clientp->dev, "Light sensor found.\n");
871
872 return 0;
873}
874
875static void tsl2583_remove(struct i2c_client *client)
876{
877 struct iio_dev *indio_dev = i2c_get_clientdata(client);
878 struct tsl2583_chip *chip = iio_priv(indio_dev);
879
880 iio_device_unregister(indio_dev);
881
882 pm_runtime_disable(dev: &client->dev);
883 pm_runtime_set_suspended(dev: &client->dev);
884
885 tsl2583_set_power_state(chip, TSL2583_CNTL_PWR_OFF);
886}
887
888static int tsl2583_suspend(struct device *dev)
889{
890 struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
891 struct tsl2583_chip *chip = iio_priv(indio_dev);
892 int ret;
893
894 mutex_lock(&chip->als_mutex);
895
896 ret = tsl2583_set_power_state(chip, TSL2583_CNTL_PWR_OFF);
897
898 mutex_unlock(lock: &chip->als_mutex);
899
900 return ret;
901}
902
903static int tsl2583_resume(struct device *dev)
904{
905 struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
906 struct tsl2583_chip *chip = iio_priv(indio_dev);
907 int ret;
908
909 mutex_lock(&chip->als_mutex);
910
911 ret = tsl2583_chip_init_and_power_on(indio_dev);
912
913 mutex_unlock(lock: &chip->als_mutex);
914
915 return ret;
916}
917
918static DEFINE_RUNTIME_DEV_PM_OPS(tsl2583_pm_ops, tsl2583_suspend,
919 tsl2583_resume, NULL);
920
921static const struct i2c_device_id tsl2583_idtable[] = {
922 { "tsl2580", 0 },
923 { "tsl2581", 1 },
924 { "tsl2583", 2 },
925 {}
926};
927MODULE_DEVICE_TABLE(i2c, tsl2583_idtable);
928
929static const struct of_device_id tsl2583_of_match[] = {
930 { .compatible = "amstaos,tsl2580", },
931 { .compatible = "amstaos,tsl2581", },
932 { .compatible = "amstaos,tsl2583", },
933 { },
934};
935MODULE_DEVICE_TABLE(of, tsl2583_of_match);
936
937/* Driver definition */
938static struct i2c_driver tsl2583_driver = {
939 .driver = {
940 .name = "tsl2583",
941 .pm = pm_ptr(&tsl2583_pm_ops),
942 .of_match_table = tsl2583_of_match,
943 },
944 .id_table = tsl2583_idtable,
945 .probe = tsl2583_probe,
946 .remove = tsl2583_remove,
947};
948module_i2c_driver(tsl2583_driver);
949
950MODULE_AUTHOR("J. August Brenner <jbrenner@taosinc.com>");
951MODULE_AUTHOR("Brian Masney <masneyb@onstation.org>");
952MODULE_DESCRIPTION("TAOS tsl2583 ambient light sensor driver");
953MODULE_LICENSE("GPL");
954

source code of linux/drivers/iio/light/tsl2583.c