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 struct {
107 u16 als_data;
108 aligned_s64 timestamp;
109 } buffer = { };
110 unsigned int val;
111 int ret;
112
113 ret = regmap_read(data->regmap, VCNL4035_ALS_DATA, &val);
114 if (ret < 0) {
115 dev_err(&data->client->dev,
116 "Trigger consumer can't read from sensor.\n");
117 goto fail_read;
118 }
119
120 buffer.als_data = val;
121 iio_push_to_buffers_with_timestamp(indio_dev, &buffer,
122 iio_get_time_ns(indio_dev));
123
124 fail_read:
125 iio_trigger_notify_done(indio_dev->trig);
126
127 return IRQ_HANDLED;
128 }
129
vcnl4035_als_drdy_set_state(struct iio_trigger * trigger,bool enable_drdy)130 static int vcnl4035_als_drdy_set_state(struct iio_trigger *trigger,
131 bool enable_drdy)
132 {
133 struct iio_dev *indio_dev = iio_trigger_get_drvdata(trigger);
134 struct vcnl4035_data *data = iio_priv(indio_dev);
135 int val = enable_drdy ? VCNL4035_MODE_ALS_INT_ENABLE :
136 VCNL4035_MODE_ALS_INT_DISABLE;
137
138 return regmap_update_bits(data->regmap, VCNL4035_ALS_CONF,
139 VCNL4035_MODE_ALS_INT_MASK,
140 val);
141 }
142
143 static const struct iio_trigger_ops vcnl4035_trigger_ops = {
144 .validate_device = iio_trigger_validate_own_device,
145 .set_trigger_state = vcnl4035_als_drdy_set_state,
146 };
147
vcnl4035_set_pm_runtime_state(struct vcnl4035_data * data,bool on)148 static int vcnl4035_set_pm_runtime_state(struct vcnl4035_data *data, bool on)
149 {
150 struct device *dev = &data->client->dev;
151
152 if (on)
153 return pm_runtime_resume_and_get(dev);
154
155 return pm_runtime_put_autosuspend(dev);
156 }
157
vcnl4035_read_info_raw(struct iio_dev * indio_dev,struct iio_chan_spec const * chan,int * val)158 static int vcnl4035_read_info_raw(struct iio_dev *indio_dev,
159 struct iio_chan_spec const *chan, int *val)
160 {
161 struct vcnl4035_data *data = iio_priv(indio_dev);
162 int ret;
163 int raw_data;
164 unsigned int reg;
165
166 if (!iio_device_claim_direct(indio_dev))
167 return -EBUSY;
168
169 if (chan->channel)
170 reg = VCNL4035_ALS_DATA;
171 else
172 reg = VCNL4035_WHITE_DATA;
173 ret = regmap_read(data->regmap, reg, &raw_data);
174 iio_device_release_direct(indio_dev);
175 if (ret)
176 return ret;
177
178 *val = raw_data;
179
180 return IIO_VAL_INT;
181 }
182
183 /*
184 * Device IT INT Time (ms) Scale (lux/step)
185 * 000 50 0.064
186 * 001 100 0.032
187 * 010 200 0.016
188 * 100 400 0.008
189 * 101 - 111 800 0.004
190 * Values are proportional, so ALS INT is selected for input due to
191 * simplicity reason. Integration time value and scaling is
192 * calculated based on device INT value
193 *
194 * Raw value needs to be scaled using ALS steps
195 */
vcnl4035_read_raw(struct iio_dev * indio_dev,struct iio_chan_spec const * chan,int * val,int * val2,long mask)196 static int vcnl4035_read_raw(struct iio_dev *indio_dev,
197 struct iio_chan_spec const *chan, int *val,
198 int *val2, long mask)
199 {
200 struct vcnl4035_data *data = iio_priv(indio_dev);
201 int ret;
202
203 switch (mask) {
204 case IIO_CHAN_INFO_RAW:
205 ret = vcnl4035_set_pm_runtime_state(data, true);
206 if (ret < 0)
207 return ret;
208 ret = vcnl4035_read_info_raw(indio_dev, chan, val);
209 vcnl4035_set_pm_runtime_state(data, false);
210 return ret;
211 case IIO_CHAN_INFO_INT_TIME:
212 *val = 50;
213 if (data->als_it_val)
214 *val = data->als_it_val * 100;
215 return IIO_VAL_INT;
216 case IIO_CHAN_INFO_SCALE:
217 *val = 64;
218 if (!data->als_it_val)
219 *val2 = 1000;
220 else
221 *val2 = data->als_it_val * 2 * 1000;
222 return IIO_VAL_FRACTIONAL;
223 default:
224 return -EINVAL;
225 }
226 }
227
vcnl4035_write_raw(struct iio_dev * indio_dev,struct iio_chan_spec const * chan,int val,int val2,long mask)228 static int vcnl4035_write_raw(struct iio_dev *indio_dev,
229 struct iio_chan_spec const *chan,
230 int val, int val2, long mask)
231 {
232 int ret;
233 struct vcnl4035_data *data = iio_priv(indio_dev);
234
235 switch (mask) {
236 case IIO_CHAN_INFO_INT_TIME:
237 if (val <= 0 || val > 800)
238 return -EINVAL;
239
240 ret = vcnl4035_set_pm_runtime_state(data, true);
241 if (ret < 0)
242 return ret;
243
244 ret = regmap_update_bits(data->regmap, VCNL4035_ALS_CONF,
245 VCNL4035_ALS_IT_MASK,
246 val / 100);
247 if (!ret)
248 data->als_it_val = val / 100;
249
250 vcnl4035_set_pm_runtime_state(data, false);
251 return ret;
252 default:
253 return -EINVAL;
254 }
255 }
256
257 /* 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)258 static int vcnl4035_read_thresh(struct iio_dev *indio_dev,
259 const struct iio_chan_spec *chan, enum iio_event_type type,
260 enum iio_event_direction dir, enum iio_event_info info,
261 int *val, int *val2)
262 {
263 struct vcnl4035_data *data = iio_priv(indio_dev);
264
265 switch (info) {
266 case IIO_EV_INFO_VALUE:
267 switch (dir) {
268 case IIO_EV_DIR_RISING:
269 *val = data->als_thresh_high;
270 return IIO_VAL_INT;
271 case IIO_EV_DIR_FALLING:
272 *val = data->als_thresh_low;
273 return IIO_VAL_INT;
274 default:
275 return -EINVAL;
276 }
277 break;
278 case IIO_EV_INFO_PERIOD:
279 *val = data->als_persistence;
280 return IIO_VAL_INT;
281 default:
282 return -EINVAL;
283 }
284
285 }
286
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)287 static int vcnl4035_write_thresh(struct iio_dev *indio_dev,
288 const struct iio_chan_spec *chan, enum iio_event_type type,
289 enum iio_event_direction dir, enum iio_event_info info, int val,
290 int val2)
291 {
292 struct vcnl4035_data *data = iio_priv(indio_dev);
293 int ret;
294
295 switch (info) {
296 case IIO_EV_INFO_VALUE:
297 /* 16 bit threshold range 0 - 65535 */
298 if (val < 0 || val > 65535)
299 return -EINVAL;
300 if (dir == IIO_EV_DIR_RISING) {
301 if (val < data->als_thresh_low)
302 return -EINVAL;
303 ret = regmap_write(data->regmap, VCNL4035_ALS_THDH,
304 val);
305 if (ret)
306 return ret;
307 data->als_thresh_high = val;
308 } else {
309 if (val > data->als_thresh_high)
310 return -EINVAL;
311 ret = regmap_write(data->regmap, VCNL4035_ALS_THDL,
312 val);
313 if (ret)
314 return ret;
315 data->als_thresh_low = val;
316 }
317 return ret;
318 case IIO_EV_INFO_PERIOD:
319 /* allow only 1 2 4 8 as persistence value */
320 if (val < 0 || val > 8 || hweight8(val) != 1)
321 return -EINVAL;
322 ret = regmap_update_bits(data->regmap, VCNL4035_ALS_CONF,
323 VCNL4035_ALS_PERS_MASK, val);
324 if (!ret)
325 data->als_persistence = val;
326 return ret;
327 default:
328 return -EINVAL;
329 }
330 }
331
332 static IIO_CONST_ATTR_INT_TIME_AVAIL("50 100 200 400 800");
333
334 static struct attribute *vcnl4035_attributes[] = {
335 &iio_const_attr_integration_time_available.dev_attr.attr,
336 NULL,
337 };
338
339 static const struct attribute_group vcnl4035_attribute_group = {
340 .attrs = vcnl4035_attributes,
341 };
342
343 static const struct iio_info vcnl4035_info = {
344 .read_raw = vcnl4035_read_raw,
345 .write_raw = vcnl4035_write_raw,
346 .read_event_value = vcnl4035_read_thresh,
347 .write_event_value = vcnl4035_write_thresh,
348 .attrs = &vcnl4035_attribute_group,
349 };
350
351 static const struct iio_event_spec vcnl4035_event_spec[] = {
352 {
353 .type = IIO_EV_TYPE_THRESH,
354 .dir = IIO_EV_DIR_RISING,
355 .mask_separate = BIT(IIO_EV_INFO_VALUE),
356 }, {
357 .type = IIO_EV_TYPE_THRESH,
358 .dir = IIO_EV_DIR_FALLING,
359 .mask_separate = BIT(IIO_EV_INFO_VALUE),
360 }, {
361 .type = IIO_EV_TYPE_THRESH,
362 .dir = IIO_EV_DIR_EITHER,
363 .mask_separate = BIT(IIO_EV_INFO_PERIOD),
364 },
365 };
366
367 enum vcnl4035_scan_index_order {
368 VCNL4035_CHAN_INDEX_LIGHT,
369 VCNL4035_CHAN_INDEX_WHITE_LED,
370 };
371
372 static const struct iio_buffer_setup_ops iio_triggered_buffer_setup_ops = {
373 .validate_scan_mask = &iio_validate_scan_mask_onehot,
374 };
375
376 static const struct iio_chan_spec vcnl4035_channels[] = {
377 {
378 .type = IIO_LIGHT,
379 .channel = 0,
380 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
381 BIT(IIO_CHAN_INFO_INT_TIME) |
382 BIT(IIO_CHAN_INFO_SCALE),
383 .event_spec = vcnl4035_event_spec,
384 .num_event_specs = ARRAY_SIZE(vcnl4035_event_spec),
385 .scan_index = VCNL4035_CHAN_INDEX_LIGHT,
386 .scan_type = {
387 .sign = 'u',
388 .realbits = 16,
389 .storagebits = 16,
390 .endianness = IIO_CPU,
391 },
392 },
393 {
394 .type = IIO_INTENSITY,
395 .channel = 1,
396 .modified = 1,
397 .channel2 = IIO_MOD_LIGHT_BOTH,
398 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
399 .scan_index = VCNL4035_CHAN_INDEX_WHITE_LED,
400 .scan_type = {
401 .sign = 'u',
402 .realbits = 16,
403 .storagebits = 16,
404 .endianness = IIO_CPU,
405 },
406 },
407 };
408
vcnl4035_set_als_power_state(struct vcnl4035_data * data,u8 status)409 static int vcnl4035_set_als_power_state(struct vcnl4035_data *data, u8 status)
410 {
411 return regmap_update_bits(data->regmap, VCNL4035_ALS_CONF,
412 VCNL4035_MODE_ALS_MASK,
413 status);
414 }
415
vcnl4035_init(struct vcnl4035_data * data)416 static int vcnl4035_init(struct vcnl4035_data *data)
417 {
418 int ret;
419 int id;
420
421 ret = regmap_read(data->regmap, VCNL4035_DEV_ID, &id);
422 if (ret < 0) {
423 dev_err(&data->client->dev, "Failed to read DEV_ID register\n");
424 return ret;
425 }
426
427 id = FIELD_GET(VCNL4035_DEV_ID_MASK, id);
428 if (id != VCNL4035_DEV_ID_VAL) {
429 dev_err(&data->client->dev, "Wrong id, got %x, expected %x\n",
430 id, VCNL4035_DEV_ID_VAL);
431 return -ENODEV;
432 }
433
434 ret = vcnl4035_set_als_power_state(data, VCNL4035_MODE_ALS_ENABLE);
435 if (ret < 0)
436 return ret;
437
438 /* ALS white channel enable */
439 ret = regmap_update_bits(data->regmap, VCNL4035_ALS_CONF,
440 VCNL4035_MODE_ALS_WHITE_CHAN,
441 1);
442 if (ret) {
443 dev_err(&data->client->dev, "set white channel enable %d\n",
444 ret);
445 return ret;
446 }
447
448 /* set default integration time - 100 ms for ALS */
449 ret = regmap_update_bits(data->regmap, VCNL4035_ALS_CONF,
450 VCNL4035_ALS_IT_MASK,
451 VCNL4035_ALS_IT_DEFAULT);
452 if (ret) {
453 dev_err(&data->client->dev, "set default ALS IT returned %d\n",
454 ret);
455 return ret;
456 }
457 data->als_it_val = VCNL4035_ALS_IT_DEFAULT;
458
459 /* set default persistence time - 1 for ALS */
460 ret = regmap_update_bits(data->regmap, VCNL4035_ALS_CONF,
461 VCNL4035_ALS_PERS_MASK,
462 VCNL4035_ALS_PERS_DEFAULT);
463 if (ret) {
464 dev_err(&data->client->dev, "set default PERS returned %d\n",
465 ret);
466 return ret;
467 }
468 data->als_persistence = VCNL4035_ALS_PERS_DEFAULT;
469
470 /* set default HIGH threshold for ALS */
471 ret = regmap_write(data->regmap, VCNL4035_ALS_THDH,
472 VCNL4035_ALS_THDH_DEFAULT);
473 if (ret) {
474 dev_err(&data->client->dev, "set default THDH returned %d\n",
475 ret);
476 return ret;
477 }
478 data->als_thresh_high = VCNL4035_ALS_THDH_DEFAULT;
479
480 /* set default LOW threshold for ALS */
481 ret = regmap_write(data->regmap, VCNL4035_ALS_THDL,
482 VCNL4035_ALS_THDL_DEFAULT);
483 if (ret) {
484 dev_err(&data->client->dev, "set default THDL returned %d\n",
485 ret);
486 return ret;
487 }
488 data->als_thresh_low = VCNL4035_ALS_THDL_DEFAULT;
489
490 return 0;
491 }
492
vcnl4035_is_volatile_reg(struct device * dev,unsigned int reg)493 static bool vcnl4035_is_volatile_reg(struct device *dev, unsigned int reg)
494 {
495 switch (reg) {
496 case VCNL4035_ALS_CONF:
497 case VCNL4035_DEV_ID:
498 return false;
499 default:
500 return true;
501 }
502 }
503
504 static const struct regmap_config vcnl4035_regmap_config = {
505 .name = "vcnl4035_regmap",
506 .reg_bits = 8,
507 .val_bits = 16,
508 .max_register = VCNL4035_DEV_ID,
509 .cache_type = REGCACHE_RBTREE,
510 .volatile_reg = vcnl4035_is_volatile_reg,
511 .val_format_endian = REGMAP_ENDIAN_LITTLE,
512 };
513
vcnl4035_probe_trigger(struct iio_dev * indio_dev)514 static int vcnl4035_probe_trigger(struct iio_dev *indio_dev)
515 {
516 int ret;
517 struct vcnl4035_data *data = iio_priv(indio_dev);
518
519 data->drdy_trigger0 = devm_iio_trigger_alloc(
520 indio_dev->dev.parent,
521 "%s-dev%d", indio_dev->name, iio_device_id(indio_dev));
522 if (!data->drdy_trigger0)
523 return -ENOMEM;
524
525 data->drdy_trigger0->ops = &vcnl4035_trigger_ops;
526 iio_trigger_set_drvdata(data->drdy_trigger0, indio_dev);
527 ret = devm_iio_trigger_register(indio_dev->dev.parent,
528 data->drdy_trigger0);
529 if (ret) {
530 dev_err(&data->client->dev, "iio trigger register failed\n");
531 return ret;
532 }
533
534 /* Trigger setup */
535 ret = devm_iio_triggered_buffer_setup(indio_dev->dev.parent, indio_dev,
536 NULL, vcnl4035_trigger_consumer_handler,
537 &iio_triggered_buffer_setup_ops);
538 if (ret < 0) {
539 dev_err(&data->client->dev, "iio triggered buffer setup failed\n");
540 return ret;
541 }
542
543 /* IRQ to trigger mapping */
544 ret = devm_request_threaded_irq(&data->client->dev, data->client->irq,
545 NULL, vcnl4035_drdy_irq_thread,
546 IRQF_TRIGGER_LOW | IRQF_ONESHOT,
547 "vcnl4035_event", indio_dev);
548 if (ret < 0)
549 dev_err(&data->client->dev, "request irq %d for trigger0 failed\n",
550 data->client->irq);
551 return ret;
552 }
553
vcnl4035_probe(struct i2c_client * client)554 static int vcnl4035_probe(struct i2c_client *client)
555 {
556 struct vcnl4035_data *data;
557 struct iio_dev *indio_dev;
558 struct regmap *regmap;
559 int ret;
560
561 indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data));
562 if (!indio_dev)
563 return -ENOMEM;
564
565 regmap = devm_regmap_init_i2c(client, &vcnl4035_regmap_config);
566 if (IS_ERR(regmap)) {
567 dev_err(&client->dev, "regmap_init failed!\n");
568 return PTR_ERR(regmap);
569 }
570
571 data = iio_priv(indio_dev);
572 i2c_set_clientdata(client, indio_dev);
573 data->client = client;
574 data->regmap = regmap;
575
576 indio_dev->info = &vcnl4035_info;
577 indio_dev->name = VCNL4035_DRV_NAME;
578 indio_dev->channels = vcnl4035_channels;
579 indio_dev->num_channels = ARRAY_SIZE(vcnl4035_channels);
580 indio_dev->modes = INDIO_DIRECT_MODE;
581
582 ret = vcnl4035_init(data);
583 if (ret < 0) {
584 dev_err(&client->dev, "vcnl4035 chip init failed\n");
585 return ret;
586 }
587
588 if (client->irq > 0) {
589 ret = vcnl4035_probe_trigger(indio_dev);
590 if (ret < 0) {
591 dev_err(&client->dev, "vcnl4035 unable init trigger\n");
592 goto fail_poweroff;
593 }
594 }
595
596 ret = pm_runtime_set_active(&client->dev);
597 if (ret < 0)
598 goto fail_poweroff;
599
600 ret = iio_device_register(indio_dev);
601 if (ret < 0)
602 goto fail_poweroff;
603
604 pm_runtime_enable(&client->dev);
605 pm_runtime_set_autosuspend_delay(&client->dev, VCNL4035_SLEEP_DELAY_MS);
606 pm_runtime_use_autosuspend(&client->dev);
607
608 return 0;
609
610 fail_poweroff:
611 vcnl4035_set_als_power_state(data, VCNL4035_MODE_ALS_DISABLE);
612 return ret;
613 }
614
vcnl4035_remove(struct i2c_client * client)615 static void vcnl4035_remove(struct i2c_client *client)
616 {
617 struct iio_dev *indio_dev = i2c_get_clientdata(client);
618 int ret;
619
620 pm_runtime_dont_use_autosuspend(&client->dev);
621 pm_runtime_disable(&client->dev);
622 iio_device_unregister(indio_dev);
623 pm_runtime_set_suspended(&client->dev);
624
625 ret = vcnl4035_set_als_power_state(iio_priv(indio_dev),
626 VCNL4035_MODE_ALS_DISABLE);
627 if (ret)
628 dev_warn(&client->dev, "Failed to put device into standby (%pe)\n",
629 ERR_PTR(ret));
630 }
631
vcnl4035_runtime_suspend(struct device * dev)632 static int vcnl4035_runtime_suspend(struct device *dev)
633 {
634 struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
635 struct vcnl4035_data *data = iio_priv(indio_dev);
636 int ret;
637
638 ret = vcnl4035_set_als_power_state(data, VCNL4035_MODE_ALS_DISABLE);
639 regcache_mark_dirty(data->regmap);
640
641 return ret;
642 }
643
vcnl4035_runtime_resume(struct device * dev)644 static int vcnl4035_runtime_resume(struct device *dev)
645 {
646 struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
647 struct vcnl4035_data *data = iio_priv(indio_dev);
648 int ret;
649
650 regcache_sync(data->regmap);
651 ret = vcnl4035_set_als_power_state(data, VCNL4035_MODE_ALS_ENABLE);
652 if (ret < 0)
653 return ret;
654
655 /* wait for 1 ALS integration cycle */
656 msleep(data->als_it_val * 100);
657
658 return 0;
659 }
660
661 static DEFINE_RUNTIME_DEV_PM_OPS(vcnl4035_pm_ops, vcnl4035_runtime_suspend,
662 vcnl4035_runtime_resume, NULL);
663
664 static const struct i2c_device_id vcnl4035_id[] = {
665 { "vcnl4035" },
666 { }
667 };
668 MODULE_DEVICE_TABLE(i2c, vcnl4035_id);
669
670 static const struct of_device_id vcnl4035_of_match[] = {
671 { .compatible = "vishay,vcnl4035", },
672 { }
673 };
674 MODULE_DEVICE_TABLE(of, vcnl4035_of_match);
675
676 static struct i2c_driver vcnl4035_driver = {
677 .driver = {
678 .name = VCNL4035_DRV_NAME,
679 .pm = pm_ptr(&vcnl4035_pm_ops),
680 .of_match_table = vcnl4035_of_match,
681 },
682 .probe = vcnl4035_probe,
683 .remove = vcnl4035_remove,
684 .id_table = vcnl4035_id,
685 };
686
687 module_i2c_driver(vcnl4035_driver);
688
689 MODULE_AUTHOR("Parthiban Nallathambi <pn@denx.de>");
690 MODULE_DESCRIPTION("VCNL4035 Ambient Light Sensor driver");
691 MODULE_LICENSE("GPL v2");
692