xref: /linux/drivers/iio/light/isl29028.c (revision a1ff5a7d78a036d6c2178ee5acd6ba4946243800)
1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3  * IIO driver for the light sensor ISL29028.
4  * ISL29028 is Concurrent Ambient Light and Proximity Sensor
5  *
6  * Copyright (c) 2012, NVIDIA CORPORATION.  All rights reserved.
7  * Copyright (c) 2016-2017 Brian Masney <masneyb@onstation.org>
8  *
9  * Datasheets:
10  *  - http://www.intersil.com/content/dam/Intersil/documents/isl2/isl29028.pdf
11  *  - http://www.intersil.com/content/dam/Intersil/documents/isl2/isl29030.pdf
12  */
13 
14 #include <linux/module.h>
15 #include <linux/i2c.h>
16 #include <linux/err.h>
17 #include <linux/mutex.h>
18 #include <linux/delay.h>
19 #include <linux/slab.h>
20 #include <linux/regmap.h>
21 #include <linux/iio/iio.h>
22 #include <linux/iio/sysfs.h>
23 #include <linux/pm_runtime.h>
24 
25 #define ISL29028_CONV_TIME_MS			100
26 
27 #define ISL29028_REG_CONFIGURE			0x01
28 
29 #define ISL29028_CONF_ALS_IR_MODE_ALS		0
30 #define ISL29028_CONF_ALS_IR_MODE_IR		BIT(0)
31 #define ISL29028_CONF_ALS_IR_MODE_MASK		BIT(0)
32 
33 #define ISL29028_CONF_ALS_RANGE_LOW_LUX		0
34 #define ISL29028_CONF_ALS_RANGE_HIGH_LUX	BIT(1)
35 #define ISL29028_CONF_ALS_RANGE_MASK		BIT(1)
36 
37 #define ISL29028_CONF_ALS_DIS			0
38 #define ISL29028_CONF_ALS_EN			BIT(2)
39 #define ISL29028_CONF_ALS_EN_MASK		BIT(2)
40 
41 #define ISL29028_CONF_PROX_SLP_SH		4
42 #define ISL29028_CONF_PROX_SLP_MASK		(7 << ISL29028_CONF_PROX_SLP_SH)
43 
44 #define ISL29028_CONF_PROX_EN			BIT(7)
45 #define ISL29028_CONF_PROX_EN_MASK		BIT(7)
46 
47 #define ISL29028_REG_INTERRUPT			0x02
48 
49 #define ISL29028_REG_PROX_DATA			0x08
50 #define ISL29028_REG_ALSIR_L			0x09
51 #define ISL29028_REG_ALSIR_U			0x0A
52 
53 #define ISL29028_REG_TEST1_MODE			0x0E
54 #define ISL29028_REG_TEST2_MODE			0x0F
55 
56 #define ISL29028_NUM_REGS			(ISL29028_REG_TEST2_MODE + 1)
57 
58 #define ISL29028_POWER_OFF_DELAY_MS		2000
59 
60 struct isl29028_prox_data {
61 	int sampling_int;
62 	int sampling_fract;
63 	int sleep_time;
64 };
65 
66 static const struct isl29028_prox_data isl29028_prox_data[] = {
67 	{   1, 250000, 800 },
68 	{   2, 500000, 400 },
69 	{   5,      0, 200 },
70 	{  10,      0, 100 },
71 	{  13, 300000,  75 },
72 	{  20,      0,  50 },
73 	{  80,      0,  13 }, /*
74 			       * Note: Data sheet lists 12.5 ms sleep time.
75 			       * Round up a half millisecond for msleep().
76 			       */
77 	{ 100,  0,   0 }
78 };
79 
80 enum isl29028_als_ir_mode {
81 	ISL29028_MODE_NONE = 0,
82 	ISL29028_MODE_ALS,
83 	ISL29028_MODE_IR,
84 };
85 
86 struct isl29028_chip {
87 	struct mutex			lock;
88 	struct regmap			*regmap;
89 	int				prox_sampling_int;
90 	int				prox_sampling_frac;
91 	bool				enable_prox;
92 	int				lux_scale;
93 	enum isl29028_als_ir_mode	als_ir_mode;
94 };
95 
isl29028_find_prox_sleep_index(int sampling_int,int sampling_fract)96 static int isl29028_find_prox_sleep_index(int sampling_int, int sampling_fract)
97 {
98 	int i;
99 
100 	for (i = 0; i < ARRAY_SIZE(isl29028_prox_data); ++i) {
101 		if (isl29028_prox_data[i].sampling_int == sampling_int &&
102 		    isl29028_prox_data[i].sampling_fract == sampling_fract)
103 			return i;
104 	}
105 
106 	return -EINVAL;
107 }
108 
isl29028_set_proxim_sampling(struct isl29028_chip * chip,int sampling_int,int sampling_fract)109 static int isl29028_set_proxim_sampling(struct isl29028_chip *chip,
110 					int sampling_int, int sampling_fract)
111 {
112 	struct device *dev = regmap_get_device(chip->regmap);
113 	int sleep_index, ret;
114 
115 	sleep_index = isl29028_find_prox_sleep_index(sampling_int,
116 						     sampling_fract);
117 	if (sleep_index < 0)
118 		return sleep_index;
119 
120 	ret = regmap_update_bits(chip->regmap, ISL29028_REG_CONFIGURE,
121 				 ISL29028_CONF_PROX_SLP_MASK,
122 				 sleep_index << ISL29028_CONF_PROX_SLP_SH);
123 
124 	if (ret < 0) {
125 		dev_err(dev, "%s(): Error %d setting the proximity sampling\n",
126 			__func__, ret);
127 		return ret;
128 	}
129 
130 	chip->prox_sampling_int = sampling_int;
131 	chip->prox_sampling_frac = sampling_fract;
132 
133 	return ret;
134 }
135 
isl29028_enable_proximity(struct isl29028_chip * chip)136 static int isl29028_enable_proximity(struct isl29028_chip *chip)
137 {
138 	int prox_index, ret;
139 
140 	ret = isl29028_set_proxim_sampling(chip, chip->prox_sampling_int,
141 					   chip->prox_sampling_frac);
142 	if (ret < 0)
143 		return ret;
144 
145 	ret = regmap_update_bits(chip->regmap, ISL29028_REG_CONFIGURE,
146 				 ISL29028_CONF_PROX_EN_MASK,
147 				 ISL29028_CONF_PROX_EN);
148 	if (ret < 0)
149 		return ret;
150 
151 	/* Wait for conversion to be complete for first sample */
152 	prox_index = isl29028_find_prox_sleep_index(chip->prox_sampling_int,
153 						    chip->prox_sampling_frac);
154 	if (prox_index < 0)
155 		return prox_index;
156 
157 	msleep(isl29028_prox_data[prox_index].sleep_time);
158 
159 	return 0;
160 }
161 
isl29028_set_als_scale(struct isl29028_chip * chip,int lux_scale)162 static int isl29028_set_als_scale(struct isl29028_chip *chip, int lux_scale)
163 {
164 	struct device *dev = regmap_get_device(chip->regmap);
165 	int val = (lux_scale == 2000) ? ISL29028_CONF_ALS_RANGE_HIGH_LUX :
166 					ISL29028_CONF_ALS_RANGE_LOW_LUX;
167 	int ret;
168 
169 	ret = regmap_update_bits(chip->regmap, ISL29028_REG_CONFIGURE,
170 				 ISL29028_CONF_ALS_RANGE_MASK, val);
171 	if (ret < 0) {
172 		dev_err(dev, "%s(): Error %d setting the ALS scale\n", __func__,
173 			ret);
174 		return ret;
175 	}
176 
177 	chip->lux_scale = lux_scale;
178 
179 	return ret;
180 }
181 
isl29028_set_als_ir_mode(struct isl29028_chip * chip,enum isl29028_als_ir_mode mode)182 static int isl29028_set_als_ir_mode(struct isl29028_chip *chip,
183 				    enum isl29028_als_ir_mode mode)
184 {
185 	int ret;
186 
187 	if (chip->als_ir_mode == mode)
188 		return 0;
189 
190 	ret = isl29028_set_als_scale(chip, chip->lux_scale);
191 	if (ret < 0)
192 		return ret;
193 
194 	switch (mode) {
195 	case ISL29028_MODE_ALS:
196 		ret = regmap_update_bits(chip->regmap, ISL29028_REG_CONFIGURE,
197 					 ISL29028_CONF_ALS_IR_MODE_MASK,
198 					 ISL29028_CONF_ALS_IR_MODE_ALS);
199 		if (ret < 0)
200 			return ret;
201 
202 		ret = regmap_update_bits(chip->regmap, ISL29028_REG_CONFIGURE,
203 					 ISL29028_CONF_ALS_RANGE_MASK,
204 					 ISL29028_CONF_ALS_RANGE_HIGH_LUX);
205 		break;
206 	case ISL29028_MODE_IR:
207 		ret = regmap_update_bits(chip->regmap, ISL29028_REG_CONFIGURE,
208 					 ISL29028_CONF_ALS_IR_MODE_MASK,
209 					 ISL29028_CONF_ALS_IR_MODE_IR);
210 		break;
211 	case ISL29028_MODE_NONE:
212 		return regmap_update_bits(chip->regmap, ISL29028_REG_CONFIGURE,
213 					  ISL29028_CONF_ALS_EN_MASK,
214 					  ISL29028_CONF_ALS_DIS);
215 	}
216 
217 	if (ret < 0)
218 		return ret;
219 
220 	/* Enable the ALS/IR */
221 	ret = regmap_update_bits(chip->regmap, ISL29028_REG_CONFIGURE,
222 				 ISL29028_CONF_ALS_EN_MASK,
223 				 ISL29028_CONF_ALS_EN);
224 	if (ret < 0)
225 		return ret;
226 
227 	/* Need to wait for conversion time if ALS/IR mode enabled */
228 	msleep(ISL29028_CONV_TIME_MS);
229 
230 	chip->als_ir_mode = mode;
231 
232 	return 0;
233 }
234 
isl29028_read_als_ir(struct isl29028_chip * chip,int * als_ir)235 static int isl29028_read_als_ir(struct isl29028_chip *chip, int *als_ir)
236 {
237 	struct device *dev = regmap_get_device(chip->regmap);
238 	unsigned int lsb;
239 	unsigned int msb;
240 	int ret;
241 
242 	ret = regmap_read(chip->regmap, ISL29028_REG_ALSIR_L, &lsb);
243 	if (ret < 0) {
244 		dev_err(dev,
245 			"%s(): Error %d reading register ALSIR_L\n",
246 			__func__, ret);
247 		return ret;
248 	}
249 
250 	ret = regmap_read(chip->regmap, ISL29028_REG_ALSIR_U, &msb);
251 	if (ret < 0) {
252 		dev_err(dev,
253 			"%s(): Error %d reading register ALSIR_U\n",
254 			__func__, ret);
255 		return ret;
256 	}
257 
258 	*als_ir = ((msb & 0xF) << 8) | (lsb & 0xFF);
259 
260 	return 0;
261 }
262 
isl29028_read_proxim(struct isl29028_chip * chip,int * prox)263 static int isl29028_read_proxim(struct isl29028_chip *chip, int *prox)
264 {
265 	struct device *dev = regmap_get_device(chip->regmap);
266 	unsigned int data;
267 	int ret;
268 
269 	if (!chip->enable_prox) {
270 		ret = isl29028_enable_proximity(chip);
271 		if (ret < 0)
272 			return ret;
273 
274 		chip->enable_prox = true;
275 	}
276 
277 	ret = regmap_read(chip->regmap, ISL29028_REG_PROX_DATA, &data);
278 	if (ret < 0) {
279 		dev_err(dev, "%s(): Error %d reading register PROX_DATA\n",
280 			__func__, ret);
281 		return ret;
282 	}
283 
284 	*prox = data;
285 
286 	return 0;
287 }
288 
isl29028_als_get(struct isl29028_chip * chip,int * als_data)289 static int isl29028_als_get(struct isl29028_chip *chip, int *als_data)
290 {
291 	struct device *dev = regmap_get_device(chip->regmap);
292 	int ret;
293 	int als_ir_data;
294 
295 	ret = isl29028_set_als_ir_mode(chip, ISL29028_MODE_ALS);
296 	if (ret < 0) {
297 		dev_err(dev, "%s(): Error %d enabling ALS mode\n", __func__,
298 			ret);
299 		return ret;
300 	}
301 
302 	ret = isl29028_read_als_ir(chip, &als_ir_data);
303 	if (ret < 0)
304 		return ret;
305 
306 	/*
307 	 * convert als data count to lux.
308 	 * if lux_scale = 125,  lux = count * 0.031
309 	 * if lux_scale = 2000, lux = count * 0.49
310 	 */
311 	if (chip->lux_scale == 125)
312 		als_ir_data = (als_ir_data * 31) / 1000;
313 	else
314 		als_ir_data = (als_ir_data * 49) / 100;
315 
316 	*als_data = als_ir_data;
317 
318 	return 0;
319 }
320 
isl29028_ir_get(struct isl29028_chip * chip,int * ir_data)321 static int isl29028_ir_get(struct isl29028_chip *chip, int *ir_data)
322 {
323 	struct device *dev = regmap_get_device(chip->regmap);
324 	int ret;
325 
326 	ret = isl29028_set_als_ir_mode(chip, ISL29028_MODE_IR);
327 	if (ret < 0) {
328 		dev_err(dev, "%s(): Error %d enabling IR mode\n", __func__,
329 			ret);
330 		return ret;
331 	}
332 
333 	return isl29028_read_als_ir(chip, ir_data);
334 }
335 
isl29028_set_pm_runtime_busy(struct isl29028_chip * chip,bool on)336 static int isl29028_set_pm_runtime_busy(struct isl29028_chip *chip, bool on)
337 {
338 	struct device *dev = regmap_get_device(chip->regmap);
339 	int ret;
340 
341 	if (on) {
342 		ret = pm_runtime_resume_and_get(dev);
343 	} else {
344 		pm_runtime_mark_last_busy(dev);
345 		ret = pm_runtime_put_autosuspend(dev);
346 	}
347 
348 	return ret;
349 }
350 
351 /* Channel IO */
isl29028_write_raw(struct iio_dev * indio_dev,struct iio_chan_spec const * chan,int val,int val2,long mask)352 static int isl29028_write_raw(struct iio_dev *indio_dev,
353 			      struct iio_chan_spec const *chan,
354 			      int val, int val2, long mask)
355 {
356 	struct isl29028_chip *chip = iio_priv(indio_dev);
357 	struct device *dev = regmap_get_device(chip->regmap);
358 	int ret;
359 
360 	ret = isl29028_set_pm_runtime_busy(chip, true);
361 	if (ret < 0)
362 		return ret;
363 
364 	mutex_lock(&chip->lock);
365 
366 	ret = -EINVAL;
367 	switch (chan->type) {
368 	case IIO_PROXIMITY:
369 		if (mask != IIO_CHAN_INFO_SAMP_FREQ) {
370 			dev_err(dev,
371 				"%s(): proximity: Mask value 0x%08lx is not supported\n",
372 				__func__, mask);
373 			break;
374 		}
375 
376 		if (val < 1 || val > 100) {
377 			dev_err(dev,
378 				"%s(): proximity: Sampling frequency %d is not in the range [1:100]\n",
379 				__func__, val);
380 			break;
381 		}
382 
383 		ret = isl29028_set_proxim_sampling(chip, val, val2);
384 		break;
385 	case IIO_LIGHT:
386 		if (mask != IIO_CHAN_INFO_SCALE) {
387 			dev_err(dev,
388 				"%s(): light: Mask value 0x%08lx is not supported\n",
389 				__func__, mask);
390 			break;
391 		}
392 
393 		if (val != 125 && val != 2000) {
394 			dev_err(dev,
395 				"%s(): light: Lux scale %d is not in the set {125, 2000}\n",
396 				__func__, val);
397 			break;
398 		}
399 
400 		ret = isl29028_set_als_scale(chip, val);
401 		break;
402 	default:
403 		dev_err(dev, "%s(): Unsupported channel type %x\n",
404 			__func__, chan->type);
405 		break;
406 	}
407 
408 	mutex_unlock(&chip->lock);
409 
410 	if (ret < 0)
411 		return ret;
412 
413 	ret = isl29028_set_pm_runtime_busy(chip, false);
414 	if (ret < 0)
415 		return ret;
416 
417 	return ret;
418 }
419 
isl29028_read_raw(struct iio_dev * indio_dev,struct iio_chan_spec const * chan,int * val,int * val2,long mask)420 static int isl29028_read_raw(struct iio_dev *indio_dev,
421 			     struct iio_chan_spec const *chan,
422 			     int *val, int *val2, long mask)
423 {
424 	struct isl29028_chip *chip = iio_priv(indio_dev);
425 	struct device *dev = regmap_get_device(chip->regmap);
426 	int ret, pm_ret;
427 
428 	ret = isl29028_set_pm_runtime_busy(chip, true);
429 	if (ret < 0)
430 		return ret;
431 
432 	mutex_lock(&chip->lock);
433 
434 	ret = -EINVAL;
435 	switch (mask) {
436 	case IIO_CHAN_INFO_RAW:
437 	case IIO_CHAN_INFO_PROCESSED:
438 		switch (chan->type) {
439 		case IIO_LIGHT:
440 			ret = isl29028_als_get(chip, val);
441 			break;
442 		case IIO_INTENSITY:
443 			ret = isl29028_ir_get(chip, val);
444 			break;
445 		case IIO_PROXIMITY:
446 			ret = isl29028_read_proxim(chip, val);
447 			break;
448 		default:
449 			break;
450 		}
451 
452 		if (ret < 0)
453 			break;
454 
455 		ret = IIO_VAL_INT;
456 		break;
457 	case IIO_CHAN_INFO_SAMP_FREQ:
458 		if (chan->type != IIO_PROXIMITY)
459 			break;
460 
461 		*val = chip->prox_sampling_int;
462 		*val2 = chip->prox_sampling_frac;
463 		ret = IIO_VAL_INT;
464 		break;
465 	case IIO_CHAN_INFO_SCALE:
466 		if (chan->type != IIO_LIGHT)
467 			break;
468 		*val = chip->lux_scale;
469 		ret = IIO_VAL_INT;
470 		break;
471 	default:
472 		dev_err(dev, "%s(): mask value 0x%08lx is not supported\n",
473 			__func__, mask);
474 		break;
475 	}
476 
477 	mutex_unlock(&chip->lock);
478 
479 	if (ret < 0)
480 		return ret;
481 
482 	/**
483 	 * Preserve the ret variable if the call to
484 	 * isl29028_set_pm_runtime_busy() is successful so the reading
485 	 * (if applicable) is returned to user space.
486 	 */
487 	pm_ret = isl29028_set_pm_runtime_busy(chip, false);
488 	if (pm_ret < 0)
489 		return pm_ret;
490 
491 	return ret;
492 }
493 
494 static IIO_CONST_ATTR(in_proximity_sampling_frequency_available,
495 				"1.25 2.5 5 10 13.3 20 80 100");
496 static IIO_CONST_ATTR(in_illuminance_scale_available, "125 2000");
497 
498 #define ISL29028_CONST_ATTR(name) (&iio_const_attr_##name.dev_attr.attr)
499 static struct attribute *isl29028_attributes[] = {
500 	ISL29028_CONST_ATTR(in_proximity_sampling_frequency_available),
501 	ISL29028_CONST_ATTR(in_illuminance_scale_available),
502 	NULL,
503 };
504 
505 static const struct attribute_group isl29108_group = {
506 	.attrs = isl29028_attributes,
507 };
508 
509 static const struct iio_chan_spec isl29028_channels[] = {
510 	{
511 		.type = IIO_LIGHT,
512 		.info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED) |
513 		BIT(IIO_CHAN_INFO_SCALE),
514 	}, {
515 		.type = IIO_INTENSITY,
516 		.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
517 	}, {
518 		.type = IIO_PROXIMITY,
519 		.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
520 		BIT(IIO_CHAN_INFO_SAMP_FREQ),
521 	}
522 };
523 
524 static const struct iio_info isl29028_info = {
525 	.attrs = &isl29108_group,
526 	.read_raw = isl29028_read_raw,
527 	.write_raw = isl29028_write_raw,
528 };
529 
isl29028_clear_configure_reg(struct isl29028_chip * chip)530 static int isl29028_clear_configure_reg(struct isl29028_chip *chip)
531 {
532 	struct device *dev = regmap_get_device(chip->regmap);
533 	int ret;
534 
535 	ret = regmap_write(chip->regmap, ISL29028_REG_CONFIGURE, 0x0);
536 	if (ret < 0)
537 		dev_err(dev, "%s(): Error %d clearing the CONFIGURE register\n",
538 			__func__, ret);
539 
540 	chip->als_ir_mode = ISL29028_MODE_NONE;
541 	chip->enable_prox = false;
542 
543 	return ret;
544 }
545 
isl29028_is_volatile_reg(struct device * dev,unsigned int reg)546 static bool isl29028_is_volatile_reg(struct device *dev, unsigned int reg)
547 {
548 	switch (reg) {
549 	case ISL29028_REG_INTERRUPT:
550 	case ISL29028_REG_PROX_DATA:
551 	case ISL29028_REG_ALSIR_L:
552 	case ISL29028_REG_ALSIR_U:
553 		return true;
554 	default:
555 		return false;
556 	}
557 }
558 
559 static const struct regmap_config isl29028_regmap_config = {
560 	.reg_bits = 8,
561 	.val_bits = 8,
562 	.volatile_reg = isl29028_is_volatile_reg,
563 	.max_register = ISL29028_NUM_REGS - 1,
564 	.num_reg_defaults_raw = ISL29028_NUM_REGS,
565 	.cache_type = REGCACHE_RBTREE,
566 };
567 
isl29028_probe(struct i2c_client * client)568 static int isl29028_probe(struct i2c_client *client)
569 {
570 	const struct i2c_device_id *id = i2c_client_get_device_id(client);
571 	struct isl29028_chip *chip;
572 	struct iio_dev *indio_dev;
573 	int ret;
574 
575 	indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*chip));
576 	if (!indio_dev)
577 		return -ENOMEM;
578 
579 	chip = iio_priv(indio_dev);
580 
581 	i2c_set_clientdata(client, indio_dev);
582 	mutex_init(&chip->lock);
583 
584 	chip->regmap = devm_regmap_init_i2c(client, &isl29028_regmap_config);
585 	if (IS_ERR(chip->regmap)) {
586 		ret = PTR_ERR(chip->regmap);
587 		dev_err(&client->dev, "%s: Error %d initializing regmap\n",
588 			__func__, ret);
589 		return ret;
590 	}
591 
592 	chip->enable_prox  = false;
593 	chip->prox_sampling_int = 20;
594 	chip->prox_sampling_frac = 0;
595 	chip->lux_scale = 2000;
596 
597 	ret = regmap_write(chip->regmap, ISL29028_REG_TEST1_MODE, 0x0);
598 	if (ret < 0) {
599 		dev_err(&client->dev,
600 			"%s(): Error %d writing to TEST1_MODE register\n",
601 			__func__, ret);
602 		return ret;
603 	}
604 
605 	ret = regmap_write(chip->regmap, ISL29028_REG_TEST2_MODE, 0x0);
606 	if (ret < 0) {
607 		dev_err(&client->dev,
608 			"%s(): Error %d writing to TEST2_MODE register\n",
609 			__func__, ret);
610 		return ret;
611 	}
612 
613 	ret = isl29028_clear_configure_reg(chip);
614 	if (ret < 0)
615 		return ret;
616 
617 	indio_dev->info = &isl29028_info;
618 	indio_dev->channels = isl29028_channels;
619 	indio_dev->num_channels = ARRAY_SIZE(isl29028_channels);
620 	indio_dev->name = id->name;
621 	indio_dev->modes = INDIO_DIRECT_MODE;
622 
623 	pm_runtime_enable(&client->dev);
624 	pm_runtime_set_autosuspend_delay(&client->dev,
625 					 ISL29028_POWER_OFF_DELAY_MS);
626 	pm_runtime_use_autosuspend(&client->dev);
627 
628 	ret = iio_device_register(indio_dev);
629 	if (ret < 0) {
630 		dev_err(&client->dev,
631 			"%s(): iio registration failed with error %d\n",
632 			__func__, ret);
633 		return ret;
634 	}
635 
636 	return 0;
637 }
638 
isl29028_remove(struct i2c_client * client)639 static void isl29028_remove(struct i2c_client *client)
640 {
641 	struct iio_dev *indio_dev = i2c_get_clientdata(client);
642 	struct isl29028_chip *chip = iio_priv(indio_dev);
643 
644 	iio_device_unregister(indio_dev);
645 
646 	pm_runtime_disable(&client->dev);
647 	pm_runtime_set_suspended(&client->dev);
648 
649 	isl29028_clear_configure_reg(chip);
650 }
651 
isl29028_suspend(struct device * dev)652 static int isl29028_suspend(struct device *dev)
653 {
654 	struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
655 	struct isl29028_chip *chip = iio_priv(indio_dev);
656 	int ret;
657 
658 	mutex_lock(&chip->lock);
659 
660 	ret = isl29028_clear_configure_reg(chip);
661 
662 	mutex_unlock(&chip->lock);
663 
664 	return ret;
665 }
666 
isl29028_resume(struct device * dev)667 static int isl29028_resume(struct device *dev)
668 {
669 	/**
670 	 * The specific component (ALS/IR or proximity) will enable itself as
671 	 * needed the next time that the user requests a reading. This is done
672 	 * above in isl29028_set_als_ir_mode() and isl29028_enable_proximity().
673 	 */
674 	return 0;
675 }
676 
677 static DEFINE_RUNTIME_DEV_PM_OPS(isl29028_pm_ops, isl29028_suspend,
678 				 isl29028_resume, NULL);
679 
680 static const struct i2c_device_id isl29028_id[] = {
681 	{ "isl29028" },
682 	{ "isl29030" },
683 	{}
684 };
685 MODULE_DEVICE_TABLE(i2c, isl29028_id);
686 
687 static const struct of_device_id isl29028_of_match[] = {
688 	{ .compatible = "isl,isl29028", }, /* for backward compat., don't use */
689 	{ .compatible = "isil,isl29028", },
690 	{ .compatible = "isil,isl29030", },
691 	{ },
692 };
693 MODULE_DEVICE_TABLE(of, isl29028_of_match);
694 
695 static struct i2c_driver isl29028_driver = {
696 	.driver  = {
697 		.name = "isl29028",
698 		.pm = pm_ptr(&isl29028_pm_ops),
699 		.of_match_table = isl29028_of_match,
700 	},
701 	.probe = isl29028_probe,
702 	.remove  = isl29028_remove,
703 	.id_table = isl29028_id,
704 };
705 
706 module_i2c_driver(isl29028_driver);
707 
708 MODULE_DESCRIPTION("ISL29028 Ambient Light and Proximity Sensor driver");
709 MODULE_LICENSE("GPL v2");
710 MODULE_AUTHOR("Laxman Dewangan <ldewangan@nvidia.com>");
711