1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * VCNL4035 Ambient Light and Proximity Sensor - 7-bit I2C slave address 0x60
4 *
5 * Copyright (c) 2018, DENX Software Engineering GmbH
6 * Author: Parthiban Nallathambi <pn@denx.de>
7 *
8 * TODO: Proximity
9 */
10 #include <linux/bitops.h>
11 #include <linux/bitfield.h>
12 #include <linux/i2c.h>
13 #include <linux/module.h>
14 #include <linux/pm_runtime.h>
15 #include <linux/regmap.h>
16
17 #include <linux/iio/buffer.h>
18 #include <linux/iio/events.h>
19 #include <linux/iio/iio.h>
20 #include <linux/iio/sysfs.h>
21 #include <linux/iio/trigger.h>
22 #include <linux/iio/trigger_consumer.h>
23 #include <linux/iio/triggered_buffer.h>
24
25 #define VCNL4035_DRV_NAME "vcnl4035"
26
27 /* Device registers */
28 #define VCNL4035_ALS_CONF 0x00
29 #define VCNL4035_ALS_THDH 0x01
30 #define VCNL4035_ALS_THDL 0x02
31 #define VCNL4035_ALS_DATA 0x0B
32 #define VCNL4035_WHITE_DATA 0x0C
33 #define VCNL4035_INT_FLAG 0x0D
34 #define VCNL4035_DEV_ID 0x0E
35
36 /* Register masks */
37 #define VCNL4035_MODE_ALS_MASK BIT(0)
38 #define VCNL4035_MODE_ALS_WHITE_CHAN BIT(8)
39 #define VCNL4035_MODE_ALS_INT_MASK BIT(1)
40 #define VCNL4035_ALS_IT_MASK GENMASK(7, 5)
41 #define VCNL4035_ALS_PERS_MASK GENMASK(3, 2)
42 #define VCNL4035_INT_ALS_IF_H_MASK BIT(12)
43 #define VCNL4035_INT_ALS_IF_L_MASK BIT(13)
44 #define VCNL4035_DEV_ID_MASK GENMASK(7, 0)
45
46 /* Default values */
47 #define VCNL4035_MODE_ALS_ENABLE BIT(0)
48 #define VCNL4035_MODE_ALS_DISABLE 0x00
49 #define VCNL4035_MODE_ALS_INT_ENABLE BIT(1)
50 #define VCNL4035_MODE_ALS_INT_DISABLE 0
51 #define VCNL4035_DEV_ID_VAL 0x80
52 #define VCNL4035_ALS_IT_DEFAULT 0x01
53 #define VCNL4035_ALS_PERS_DEFAULT 0x00
54 #define VCNL4035_ALS_THDH_DEFAULT 5000
55 #define VCNL4035_ALS_THDL_DEFAULT 100
56 #define VCNL4035_SLEEP_DELAY_MS 2000
57
58 struct vcnl4035_data {
59 struct i2c_client *client;
60 struct regmap *regmap;
61 unsigned int als_it_val;
62 unsigned int als_persistence;
63 unsigned int als_thresh_low;
64 unsigned int als_thresh_high;
65 struct iio_trigger *drdy_trigger0;
66 };
67
vcnl4035_is_triggered(struct vcnl4035_data * data)68 static inline bool vcnl4035_is_triggered(struct vcnl4035_data *data)
69 {
70 int ret;
71 int reg;
72
73 ret = regmap_read(data->regmap, VCNL4035_INT_FLAG, ®);
74 if (ret < 0)
75 return false;
76
77 return !!(reg &
78 (VCNL4035_INT_ALS_IF_H_MASK | VCNL4035_INT_ALS_IF_L_MASK));
79 }
80
vcnl4035_drdy_irq_thread(int irq,void * private)81 static irqreturn_t vcnl4035_drdy_irq_thread(int irq, void *private)
82 {
83 struct iio_dev *indio_dev = private;
84 struct vcnl4035_data *data = iio_priv(indio_dev);
85
86 if (vcnl4035_is_triggered(data)) {
87 iio_push_event(indio_dev, IIO_UNMOD_EVENT_CODE(IIO_LIGHT,
88 0,
89 IIO_EV_TYPE_THRESH,
90 IIO_EV_DIR_EITHER),
91 iio_get_time_ns(indio_dev));
92 iio_trigger_poll_nested(data->drdy_trigger0);
93 return IRQ_HANDLED;
94 }
95
96 return IRQ_NONE;
97 }
98
99 /* Triggered buffer */
vcnl4035_trigger_consumer_handler(int irq,void * p)100 static irqreturn_t vcnl4035_trigger_consumer_handler(int irq, void *p)
101 {
102 struct iio_poll_func *pf = p;
103 struct iio_dev *indio_dev = pf->indio_dev;
104 struct vcnl4035_data *data = iio_priv(indio_dev);
105 /* Ensure naturally aligned timestamp */
106 u8 buffer[ALIGN(sizeof(u16), sizeof(s64)) + sizeof(s64)] __aligned(8) = { };
107 int ret;
108
109 ret = regmap_read(data->regmap, VCNL4035_ALS_DATA, (int *)buffer);
110 if (ret < 0) {
111 dev_err(&data->client->dev,
112 "Trigger consumer can't read from sensor.\n");
113 goto fail_read;
114 }
115 iio_push_to_buffers_with_timestamp(indio_dev, buffer,
116 iio_get_time_ns(indio_dev));
117
118 fail_read:
119 iio_trigger_notify_done(indio_dev->trig);
120
121 return IRQ_HANDLED;
122 }
123
vcnl4035_als_drdy_set_state(struct iio_trigger * trigger,bool enable_drdy)124 static int vcnl4035_als_drdy_set_state(struct iio_trigger *trigger,
125 bool enable_drdy)
126 {
127 struct iio_dev *indio_dev = iio_trigger_get_drvdata(trigger);
128 struct vcnl4035_data *data = iio_priv(indio_dev);
129 int val = enable_drdy ? VCNL4035_MODE_ALS_INT_ENABLE :
130 VCNL4035_MODE_ALS_INT_DISABLE;
131
132 return regmap_update_bits(data->regmap, VCNL4035_ALS_CONF,
133 VCNL4035_MODE_ALS_INT_MASK,
134 val);
135 }
136
137 static const struct iio_trigger_ops vcnl4035_trigger_ops = {
138 .validate_device = iio_trigger_validate_own_device,
139 .set_trigger_state = vcnl4035_als_drdy_set_state,
140 };
141
vcnl4035_set_pm_runtime_state(struct vcnl4035_data * data,bool on)142 static int vcnl4035_set_pm_runtime_state(struct vcnl4035_data *data, bool on)
143 {
144 int ret;
145 struct device *dev = &data->client->dev;
146
147 if (on) {
148 ret = pm_runtime_resume_and_get(dev);
149 } else {
150 pm_runtime_mark_last_busy(dev);
151 ret = pm_runtime_put_autosuspend(dev);
152 }
153
154 return ret;
155 }
156
vcnl4035_read_info_raw(struct iio_dev * indio_dev,struct iio_chan_spec const * chan,int * val)157 static int vcnl4035_read_info_raw(struct iio_dev *indio_dev,
158 struct iio_chan_spec const *chan, int *val)
159 {
160 struct vcnl4035_data *data = iio_priv(indio_dev);
161 int ret;
162 int raw_data;
163 unsigned int reg;
164
165 if (!iio_device_claim_direct(indio_dev))
166 return -EBUSY;
167
168 if (chan->channel)
169 reg = VCNL4035_ALS_DATA;
170 else
171 reg = VCNL4035_WHITE_DATA;
172 ret = regmap_read(data->regmap, reg, &raw_data);
173 iio_device_release_direct(indio_dev);
174 if (ret)
175 return ret;
176
177 *val = raw_data;
178
179 return IIO_VAL_INT;
180 }
181
182 /*
183 * Device IT INT Time (ms) Scale (lux/step)
184 * 000 50 0.064
185 * 001 100 0.032
186 * 010 200 0.016
187 * 100 400 0.008
188 * 101 - 111 800 0.004
189 * Values are proportional, so ALS INT is selected for input due to
190 * simplicity reason. Integration time value and scaling is
191 * calculated based on device INT value
192 *
193 * Raw value needs to be scaled using ALS steps
194 */
vcnl4035_read_raw(struct iio_dev * indio_dev,struct iio_chan_spec const * chan,int * val,int * val2,long mask)195 static int vcnl4035_read_raw(struct iio_dev *indio_dev,
196 struct iio_chan_spec const *chan, int *val,
197 int *val2, long mask)
198 {
199 struct vcnl4035_data *data = iio_priv(indio_dev);
200 int ret;
201
202 switch (mask) {
203 case IIO_CHAN_INFO_RAW:
204 ret = vcnl4035_set_pm_runtime_state(data, true);
205 if (ret < 0)
206 return ret;
207 ret = vcnl4035_read_info_raw(indio_dev, chan, val);
208 vcnl4035_set_pm_runtime_state(data, false);
209 return ret;
210 case IIO_CHAN_INFO_INT_TIME:
211 *val = 50;
212 if (data->als_it_val)
213 *val = data->als_it_val * 100;
214 return IIO_VAL_INT;
215 case IIO_CHAN_INFO_SCALE:
216 *val = 64;
217 if (!data->als_it_val)
218 *val2 = 1000;
219 else
220 *val2 = data->als_it_val * 2 * 1000;
221 return IIO_VAL_FRACTIONAL;
222 default:
223 return -EINVAL;
224 }
225 }
226
vcnl4035_write_raw(struct iio_dev * indio_dev,struct iio_chan_spec const * chan,int val,int val2,long mask)227 static int vcnl4035_write_raw(struct iio_dev *indio_dev,
228 struct iio_chan_spec const *chan,
229 int val, int val2, long mask)
230 {
231 int ret;
232 struct vcnl4035_data *data = iio_priv(indio_dev);
233
234 switch (mask) {
235 case IIO_CHAN_INFO_INT_TIME:
236 if (val <= 0 || val > 800)
237 return -EINVAL;
238
239 ret = vcnl4035_set_pm_runtime_state(data, true);
240 if (ret < 0)
241 return ret;
242
243 ret = regmap_update_bits(data->regmap, VCNL4035_ALS_CONF,
244 VCNL4035_ALS_IT_MASK,
245 val / 100);
246 if (!ret)
247 data->als_it_val = val / 100;
248
249 vcnl4035_set_pm_runtime_state(data, false);
250 return ret;
251 default:
252 return -EINVAL;
253 }
254 }
255
256 /* No direct ABI for persistence and threshold, so eventing */
vcnl4035_read_thresh(struct iio_dev * indio_dev,const struct iio_chan_spec * chan,enum iio_event_type type,enum iio_event_direction dir,enum iio_event_info info,int * val,int * val2)257 static int vcnl4035_read_thresh(struct iio_dev *indio_dev,
258 const struct iio_chan_spec *chan, enum iio_event_type type,
259 enum iio_event_direction dir, enum iio_event_info info,
260 int *val, int *val2)
261 {
262 struct vcnl4035_data *data = iio_priv(indio_dev);
263
264 switch (info) {
265 case IIO_EV_INFO_VALUE:
266 switch (dir) {
267 case IIO_EV_DIR_RISING:
268 *val = data->als_thresh_high;
269 return IIO_VAL_INT;
270 case IIO_EV_DIR_FALLING:
271 *val = data->als_thresh_low;
272 return IIO_VAL_INT;
273 default:
274 return -EINVAL;
275 }
276 break;
277 case IIO_EV_INFO_PERIOD:
278 *val = data->als_persistence;
279 return IIO_VAL_INT;
280 default:
281 return -EINVAL;
282 }
283
284 }
285
vcnl4035_write_thresh(struct iio_dev * indio_dev,const struct iio_chan_spec * chan,enum iio_event_type type,enum iio_event_direction dir,enum iio_event_info info,int val,int val2)286 static int vcnl4035_write_thresh(struct iio_dev *indio_dev,
287 const struct iio_chan_spec *chan, enum iio_event_type type,
288 enum iio_event_direction dir, enum iio_event_info info, int val,
289 int val2)
290 {
291 struct vcnl4035_data *data = iio_priv(indio_dev);
292 int ret;
293
294 switch (info) {
295 case IIO_EV_INFO_VALUE:
296 /* 16 bit threshold range 0 - 65535 */
297 if (val < 0 || val > 65535)
298 return -EINVAL;
299 if (dir == IIO_EV_DIR_RISING) {
300 if (val < data->als_thresh_low)
301 return -EINVAL;
302 ret = regmap_write(data->regmap, VCNL4035_ALS_THDH,
303 val);
304 if (ret)
305 return ret;
306 data->als_thresh_high = val;
307 } else {
308 if (val > data->als_thresh_high)
309 return -EINVAL;
310 ret = regmap_write(data->regmap, VCNL4035_ALS_THDL,
311 val);
312 if (ret)
313 return ret;
314 data->als_thresh_low = val;
315 }
316 return ret;
317 case IIO_EV_INFO_PERIOD:
318 /* allow only 1 2 4 8 as persistence value */
319 if (val < 0 || val > 8 || hweight8(val) != 1)
320 return -EINVAL;
321 ret = regmap_update_bits(data->regmap, VCNL4035_ALS_CONF,
322 VCNL4035_ALS_PERS_MASK, val);
323 if (!ret)
324 data->als_persistence = val;
325 return ret;
326 default:
327 return -EINVAL;
328 }
329 }
330
331 static IIO_CONST_ATTR_INT_TIME_AVAIL("50 100 200 400 800");
332
333 static struct attribute *vcnl4035_attributes[] = {
334 &iio_const_attr_integration_time_available.dev_attr.attr,
335 NULL,
336 };
337
338 static const struct attribute_group vcnl4035_attribute_group = {
339 .attrs = vcnl4035_attributes,
340 };
341
342 static const struct iio_info vcnl4035_info = {
343 .read_raw = vcnl4035_read_raw,
344 .write_raw = vcnl4035_write_raw,
345 .read_event_value = vcnl4035_read_thresh,
346 .write_event_value = vcnl4035_write_thresh,
347 .attrs = &vcnl4035_attribute_group,
348 };
349
350 static const struct iio_event_spec vcnl4035_event_spec[] = {
351 {
352 .type = IIO_EV_TYPE_THRESH,
353 .dir = IIO_EV_DIR_RISING,
354 .mask_separate = BIT(IIO_EV_INFO_VALUE),
355 }, {
356 .type = IIO_EV_TYPE_THRESH,
357 .dir = IIO_EV_DIR_FALLING,
358 .mask_separate = BIT(IIO_EV_INFO_VALUE),
359 }, {
360 .type = IIO_EV_TYPE_THRESH,
361 .dir = IIO_EV_DIR_EITHER,
362 .mask_separate = BIT(IIO_EV_INFO_PERIOD),
363 },
364 };
365
366 enum vcnl4035_scan_index_order {
367 VCNL4035_CHAN_INDEX_LIGHT,
368 VCNL4035_CHAN_INDEX_WHITE_LED,
369 };
370
371 static const struct iio_buffer_setup_ops iio_triggered_buffer_setup_ops = {
372 .validate_scan_mask = &iio_validate_scan_mask_onehot,
373 };
374
375 static const struct iio_chan_spec vcnl4035_channels[] = {
376 {
377 .type = IIO_LIGHT,
378 .channel = 0,
379 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
380 BIT(IIO_CHAN_INFO_INT_TIME) |
381 BIT(IIO_CHAN_INFO_SCALE),
382 .event_spec = vcnl4035_event_spec,
383 .num_event_specs = ARRAY_SIZE(vcnl4035_event_spec),
384 .scan_index = VCNL4035_CHAN_INDEX_LIGHT,
385 .scan_type = {
386 .sign = 'u',
387 .realbits = 16,
388 .storagebits = 16,
389 .endianness = IIO_LE,
390 },
391 },
392 {
393 .type = IIO_INTENSITY,
394 .channel = 1,
395 .modified = 1,
396 .channel2 = IIO_MOD_LIGHT_BOTH,
397 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
398 .scan_index = VCNL4035_CHAN_INDEX_WHITE_LED,
399 .scan_type = {
400 .sign = 'u',
401 .realbits = 16,
402 .storagebits = 16,
403 .endianness = IIO_LE,
404 },
405 },
406 };
407
vcnl4035_set_als_power_state(struct vcnl4035_data * data,u8 status)408 static int vcnl4035_set_als_power_state(struct vcnl4035_data *data, u8 status)
409 {
410 return regmap_update_bits(data->regmap, VCNL4035_ALS_CONF,
411 VCNL4035_MODE_ALS_MASK,
412 status);
413 }
414
vcnl4035_init(struct vcnl4035_data * data)415 static int vcnl4035_init(struct vcnl4035_data *data)
416 {
417 int ret;
418 int id;
419
420 ret = regmap_read(data->regmap, VCNL4035_DEV_ID, &id);
421 if (ret < 0) {
422 dev_err(&data->client->dev, "Failed to read DEV_ID register\n");
423 return ret;
424 }
425
426 id = FIELD_GET(VCNL4035_DEV_ID_MASK, id);
427 if (id != VCNL4035_DEV_ID_VAL) {
428 dev_err(&data->client->dev, "Wrong id, got %x, expected %x\n",
429 id, VCNL4035_DEV_ID_VAL);
430 return -ENODEV;
431 }
432
433 ret = vcnl4035_set_als_power_state(data, VCNL4035_MODE_ALS_ENABLE);
434 if (ret < 0)
435 return ret;
436
437 /* ALS white channel enable */
438 ret = regmap_update_bits(data->regmap, VCNL4035_ALS_CONF,
439 VCNL4035_MODE_ALS_WHITE_CHAN,
440 1);
441 if (ret) {
442 dev_err(&data->client->dev, "set white channel enable %d\n",
443 ret);
444 return ret;
445 }
446
447 /* set default integration time - 100 ms for ALS */
448 ret = regmap_update_bits(data->regmap, VCNL4035_ALS_CONF,
449 VCNL4035_ALS_IT_MASK,
450 VCNL4035_ALS_IT_DEFAULT);
451 if (ret) {
452 dev_err(&data->client->dev, "set default ALS IT returned %d\n",
453 ret);
454 return ret;
455 }
456 data->als_it_val = VCNL4035_ALS_IT_DEFAULT;
457
458 /* set default persistence time - 1 for ALS */
459 ret = regmap_update_bits(data->regmap, VCNL4035_ALS_CONF,
460 VCNL4035_ALS_PERS_MASK,
461 VCNL4035_ALS_PERS_DEFAULT);
462 if (ret) {
463 dev_err(&data->client->dev, "set default PERS returned %d\n",
464 ret);
465 return ret;
466 }
467 data->als_persistence = VCNL4035_ALS_PERS_DEFAULT;
468
469 /* set default HIGH threshold for ALS */
470 ret = regmap_write(data->regmap, VCNL4035_ALS_THDH,
471 VCNL4035_ALS_THDH_DEFAULT);
472 if (ret) {
473 dev_err(&data->client->dev, "set default THDH returned %d\n",
474 ret);
475 return ret;
476 }
477 data->als_thresh_high = VCNL4035_ALS_THDH_DEFAULT;
478
479 /* set default LOW threshold for ALS */
480 ret = regmap_write(data->regmap, VCNL4035_ALS_THDL,
481 VCNL4035_ALS_THDL_DEFAULT);
482 if (ret) {
483 dev_err(&data->client->dev, "set default THDL returned %d\n",
484 ret);
485 return ret;
486 }
487 data->als_thresh_low = VCNL4035_ALS_THDL_DEFAULT;
488
489 return 0;
490 }
491
vcnl4035_is_volatile_reg(struct device * dev,unsigned int reg)492 static bool vcnl4035_is_volatile_reg(struct device *dev, unsigned int reg)
493 {
494 switch (reg) {
495 case VCNL4035_ALS_CONF:
496 case VCNL4035_DEV_ID:
497 return false;
498 default:
499 return true;
500 }
501 }
502
503 static const struct regmap_config vcnl4035_regmap_config = {
504 .name = "vcnl4035_regmap",
505 .reg_bits = 8,
506 .val_bits = 16,
507 .max_register = VCNL4035_DEV_ID,
508 .cache_type = REGCACHE_RBTREE,
509 .volatile_reg = vcnl4035_is_volatile_reg,
510 .val_format_endian = REGMAP_ENDIAN_LITTLE,
511 };
512
vcnl4035_probe_trigger(struct iio_dev * indio_dev)513 static int vcnl4035_probe_trigger(struct iio_dev *indio_dev)
514 {
515 int ret;
516 struct vcnl4035_data *data = iio_priv(indio_dev);
517
518 data->drdy_trigger0 = devm_iio_trigger_alloc(
519 indio_dev->dev.parent,
520 "%s-dev%d", indio_dev->name, iio_device_id(indio_dev));
521 if (!data->drdy_trigger0)
522 return -ENOMEM;
523
524 data->drdy_trigger0->ops = &vcnl4035_trigger_ops;
525 iio_trigger_set_drvdata(data->drdy_trigger0, indio_dev);
526 ret = devm_iio_trigger_register(indio_dev->dev.parent,
527 data->drdy_trigger0);
528 if (ret) {
529 dev_err(&data->client->dev, "iio trigger register failed\n");
530 return ret;
531 }
532
533 /* Trigger setup */
534 ret = devm_iio_triggered_buffer_setup(indio_dev->dev.parent, indio_dev,
535 NULL, vcnl4035_trigger_consumer_handler,
536 &iio_triggered_buffer_setup_ops);
537 if (ret < 0) {
538 dev_err(&data->client->dev, "iio triggered buffer setup failed\n");
539 return ret;
540 }
541
542 /* IRQ to trigger mapping */
543 ret = devm_request_threaded_irq(&data->client->dev, data->client->irq,
544 NULL, vcnl4035_drdy_irq_thread,
545 IRQF_TRIGGER_LOW | IRQF_ONESHOT,
546 "vcnl4035_event", indio_dev);
547 if (ret < 0)
548 dev_err(&data->client->dev, "request irq %d for trigger0 failed\n",
549 data->client->irq);
550 return ret;
551 }
552
vcnl4035_probe(struct i2c_client * client)553 static int vcnl4035_probe(struct i2c_client *client)
554 {
555 struct vcnl4035_data *data;
556 struct iio_dev *indio_dev;
557 struct regmap *regmap;
558 int ret;
559
560 indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data));
561 if (!indio_dev)
562 return -ENOMEM;
563
564 regmap = devm_regmap_init_i2c(client, &vcnl4035_regmap_config);
565 if (IS_ERR(regmap)) {
566 dev_err(&client->dev, "regmap_init failed!\n");
567 return PTR_ERR(regmap);
568 }
569
570 data = iio_priv(indio_dev);
571 i2c_set_clientdata(client, indio_dev);
572 data->client = client;
573 data->regmap = regmap;
574
575 indio_dev->info = &vcnl4035_info;
576 indio_dev->name = VCNL4035_DRV_NAME;
577 indio_dev->channels = vcnl4035_channels;
578 indio_dev->num_channels = ARRAY_SIZE(vcnl4035_channels);
579 indio_dev->modes = INDIO_DIRECT_MODE;
580
581 ret = vcnl4035_init(data);
582 if (ret < 0) {
583 dev_err(&client->dev, "vcnl4035 chip init failed\n");
584 return ret;
585 }
586
587 if (client->irq > 0) {
588 ret = vcnl4035_probe_trigger(indio_dev);
589 if (ret < 0) {
590 dev_err(&client->dev, "vcnl4035 unable init trigger\n");
591 goto fail_poweroff;
592 }
593 }
594
595 ret = pm_runtime_set_active(&client->dev);
596 if (ret < 0)
597 goto fail_poweroff;
598
599 ret = iio_device_register(indio_dev);
600 if (ret < 0)
601 goto fail_poweroff;
602
603 pm_runtime_enable(&client->dev);
604 pm_runtime_set_autosuspend_delay(&client->dev, VCNL4035_SLEEP_DELAY_MS);
605 pm_runtime_use_autosuspend(&client->dev);
606
607 return 0;
608
609 fail_poweroff:
610 vcnl4035_set_als_power_state(data, VCNL4035_MODE_ALS_DISABLE);
611 return ret;
612 }
613
vcnl4035_remove(struct i2c_client * client)614 static void vcnl4035_remove(struct i2c_client *client)
615 {
616 struct iio_dev *indio_dev = i2c_get_clientdata(client);
617 int ret;
618
619 pm_runtime_dont_use_autosuspend(&client->dev);
620 pm_runtime_disable(&client->dev);
621 iio_device_unregister(indio_dev);
622 pm_runtime_set_suspended(&client->dev);
623
624 ret = vcnl4035_set_als_power_state(iio_priv(indio_dev),
625 VCNL4035_MODE_ALS_DISABLE);
626 if (ret)
627 dev_warn(&client->dev, "Failed to put device into standby (%pe)\n",
628 ERR_PTR(ret));
629 }
630
vcnl4035_runtime_suspend(struct device * dev)631 static int vcnl4035_runtime_suspend(struct device *dev)
632 {
633 struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
634 struct vcnl4035_data *data = iio_priv(indio_dev);
635 int ret;
636
637 ret = vcnl4035_set_als_power_state(data, VCNL4035_MODE_ALS_DISABLE);
638 regcache_mark_dirty(data->regmap);
639
640 return ret;
641 }
642
vcnl4035_runtime_resume(struct device * dev)643 static int vcnl4035_runtime_resume(struct device *dev)
644 {
645 struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
646 struct vcnl4035_data *data = iio_priv(indio_dev);
647 int ret;
648
649 regcache_sync(data->regmap);
650 ret = vcnl4035_set_als_power_state(data, VCNL4035_MODE_ALS_ENABLE);
651 if (ret < 0)
652 return ret;
653
654 /* wait for 1 ALS integration cycle */
655 msleep(data->als_it_val * 100);
656
657 return 0;
658 }
659
660 static DEFINE_RUNTIME_DEV_PM_OPS(vcnl4035_pm_ops, vcnl4035_runtime_suspend,
661 vcnl4035_runtime_resume, NULL);
662
663 static const struct i2c_device_id vcnl4035_id[] = {
664 { "vcnl4035" },
665 { }
666 };
667 MODULE_DEVICE_TABLE(i2c, vcnl4035_id);
668
669 static const struct of_device_id vcnl4035_of_match[] = {
670 { .compatible = "vishay,vcnl4035", },
671 { }
672 };
673 MODULE_DEVICE_TABLE(of, vcnl4035_of_match);
674
675 static struct i2c_driver vcnl4035_driver = {
676 .driver = {
677 .name = VCNL4035_DRV_NAME,
678 .pm = pm_ptr(&vcnl4035_pm_ops),
679 .of_match_table = vcnl4035_of_match,
680 },
681 .probe = vcnl4035_probe,
682 .remove = vcnl4035_remove,
683 .id_table = vcnl4035_id,
684 };
685
686 module_i2c_driver(vcnl4035_driver);
687
688 MODULE_AUTHOR("Parthiban Nallathambi <pn@denx.de>");
689 MODULE_DESCRIPTION("VCNL4035 Ambient Light Sensor driver");
690 MODULE_LICENSE("GPL v2");
691