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10#include <linux/bitops.h>
11#include <linux/i2c.h>
12#include <linux/module.h>
13#include <linux/pm_runtime.h>
14#include <linux/regmap.h>
15
16#include <linux/iio/buffer.h>
17#include <linux/iio/events.h>
18#include <linux/iio/iio.h>
19#include <linux/iio/sysfs.h>
20#include <linux/iio/trigger.h>
21#include <linux/iio/trigger_consumer.h>
22#include <linux/iio/triggered_buffer.h>
23
24#define VCNL4035_DRV_NAME "vcnl4035"
25#define VCNL4035_IRQ_NAME "vcnl4035_event"
26#define VCNL4035_REGMAP_NAME "vcnl4035_regmap"
27
28
29#define VCNL4035_ALS_CONF 0x00
30#define VCNL4035_ALS_THDH 0x01
31#define VCNL4035_ALS_THDL 0x02
32#define VCNL4035_ALS_DATA 0x0B
33#define VCNL4035_WHITE_DATA 0x0C
34#define VCNL4035_INT_FLAG 0x0D
35#define VCNL4035_DEV_ID 0x0E
36
37
38#define VCNL4035_MODE_ALS_MASK BIT(0)
39#define VCNL4035_MODE_ALS_WHITE_CHAN BIT(8)
40#define VCNL4035_MODE_ALS_INT_MASK BIT(1)
41#define VCNL4035_ALS_IT_MASK GENMASK(7, 5)
42#define VCNL4035_ALS_PERS_MASK GENMASK(3, 2)
43#define VCNL4035_INT_ALS_IF_H_MASK BIT(12)
44#define VCNL4035_INT_ALS_IF_L_MASK BIT(13)
45
46
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
58struct 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
68static 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
81static 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_chained(data->drdy_trigger0);
93 return IRQ_HANDLED;
94 }
95
96 return IRQ_NONE;
97}
98
99
100static 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 u8 buffer[ALIGN(sizeof(u16), sizeof(s64)) + sizeof(s64)];
106 int ret;
107
108 ret = regmap_read(data->regmap, VCNL4035_ALS_DATA, (int *)buffer);
109 if (ret < 0) {
110 dev_err(&data->client->dev,
111 "Trigger consumer can't read from sensor.\n");
112 goto fail_read;
113 }
114 iio_push_to_buffers_with_timestamp(indio_dev, buffer,
115 iio_get_time_ns(indio_dev));
116
117fail_read:
118 iio_trigger_notify_done(indio_dev->trig);
119
120 return IRQ_HANDLED;
121}
122
123static int vcnl4035_als_drdy_set_state(struct iio_trigger *trigger,
124 bool enable_drdy)
125{
126 struct iio_dev *indio_dev = iio_trigger_get_drvdata(trigger);
127 struct vcnl4035_data *data = iio_priv(indio_dev);
128 int val = enable_drdy ? VCNL4035_MODE_ALS_INT_ENABLE :
129 VCNL4035_MODE_ALS_INT_DISABLE;
130
131 return regmap_update_bits(data->regmap, VCNL4035_ALS_CONF,
132 VCNL4035_MODE_ALS_INT_MASK,
133 val);
134}
135
136static const struct iio_trigger_ops vcnl4035_trigger_ops = {
137 .validate_device = iio_trigger_validate_own_device,
138 .set_trigger_state = vcnl4035_als_drdy_set_state,
139};
140
141static int vcnl4035_set_pm_runtime_state(struct vcnl4035_data *data, bool on)
142{
143 int ret;
144 struct device *dev = &data->client->dev;
145
146 if (on) {
147 ret = pm_runtime_get_sync(dev);
148 if (ret < 0)
149 pm_runtime_put_noidle(dev);
150 } else {
151 pm_runtime_mark_last_busy(dev);
152 ret = pm_runtime_put_autosuspend(dev);
153 }
154
155 return ret;
156}
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171static int vcnl4035_read_raw(struct iio_dev *indio_dev,
172 struct iio_chan_spec const *chan, int *val,
173 int *val2, long mask)
174{
175 struct vcnl4035_data *data = iio_priv(indio_dev);
176 int ret;
177 int raw_data;
178 unsigned int reg;
179
180 switch (mask) {
181 case IIO_CHAN_INFO_RAW:
182 ret = vcnl4035_set_pm_runtime_state(data, true);
183 if (ret < 0)
184 return ret;
185
186 ret = iio_device_claim_direct_mode(indio_dev);
187 if (!ret) {
188 if (chan->channel)
189 reg = VCNL4035_ALS_DATA;
190 else
191 reg = VCNL4035_WHITE_DATA;
192 ret = regmap_read(data->regmap, reg, &raw_data);
193 iio_device_release_direct_mode(indio_dev);
194 if (!ret) {
195 *val = raw_data;
196 ret = IIO_VAL_INT;
197 }
198 }
199 vcnl4035_set_pm_runtime_state(data, false);
200 return ret;
201 case IIO_CHAN_INFO_INT_TIME:
202 *val = 50;
203 if (data->als_it_val)
204 *val = data->als_it_val * 100;
205 return IIO_VAL_INT;
206 case IIO_CHAN_INFO_SCALE:
207 *val = 64;
208 if (!data->als_it_val)
209 *val2 = 1000;
210 else
211 *val2 = data->als_it_val * 2 * 1000;
212 return IIO_VAL_FRACTIONAL;
213 default:
214 return -EINVAL;
215 }
216}
217
218static int vcnl4035_write_raw(struct iio_dev *indio_dev,
219 struct iio_chan_spec const *chan,
220 int val, int val2, long mask)
221{
222 int ret;
223 struct vcnl4035_data *data = iio_priv(indio_dev);
224
225 switch (mask) {
226 case IIO_CHAN_INFO_INT_TIME:
227 if (val <= 0 || val > 800)
228 return -EINVAL;
229
230 ret = vcnl4035_set_pm_runtime_state(data, true);
231 if (ret < 0)
232 return ret;
233
234 ret = regmap_update_bits(data->regmap, VCNL4035_ALS_CONF,
235 VCNL4035_ALS_IT_MASK,
236 val / 100);
237 if (!ret)
238 data->als_it_val = val / 100;
239
240 vcnl4035_set_pm_runtime_state(data, false);
241 return ret;
242 default:
243 return -EINVAL;
244 }
245}
246
247
248static int vcnl4035_read_thresh(struct iio_dev *indio_dev,
249 const struct iio_chan_spec *chan, enum iio_event_type type,
250 enum iio_event_direction dir, enum iio_event_info info,
251 int *val, int *val2)
252{
253 struct vcnl4035_data *data = iio_priv(indio_dev);
254
255 switch (info) {
256 case IIO_EV_INFO_VALUE:
257 switch (dir) {
258 case IIO_EV_DIR_RISING:
259 *val = data->als_thresh_high;
260 return IIO_VAL_INT;
261 case IIO_EV_DIR_FALLING:
262 *val = data->als_thresh_low;
263 return IIO_VAL_INT;
264 default:
265 return -EINVAL;
266 }
267 break;
268 case IIO_EV_INFO_PERIOD:
269 *val = data->als_persistence;
270 return IIO_VAL_INT;
271 default:
272 return -EINVAL;
273 }
274
275}
276
277static int vcnl4035_write_thresh(struct iio_dev *indio_dev,
278 const struct iio_chan_spec *chan, enum iio_event_type type,
279 enum iio_event_direction dir, enum iio_event_info info, int val,
280 int val2)
281{
282 struct vcnl4035_data *data = iio_priv(indio_dev);
283 int ret;
284
285 switch (info) {
286 case IIO_EV_INFO_VALUE:
287
288 if (val < 0 || val > 65535)
289 return -EINVAL;
290 if (dir == IIO_EV_DIR_RISING) {
291 if (val < data->als_thresh_low)
292 return -EINVAL;
293 ret = regmap_write(data->regmap, VCNL4035_ALS_THDH,
294 val);
295 if (ret)
296 return ret;
297 data->als_thresh_high = val;
298 } else {
299 if (val > data->als_thresh_high)
300 return -EINVAL;
301 ret = regmap_write(data->regmap, VCNL4035_ALS_THDL,
302 val);
303 if (ret)
304 return ret;
305 data->als_thresh_low = val;
306 }
307 return ret;
308 case IIO_EV_INFO_PERIOD:
309
310 if (val < 0 || val > 8 || hweight8(val) != 1)
311 return -EINVAL;
312 ret = regmap_update_bits(data->regmap, VCNL4035_ALS_CONF,
313 VCNL4035_ALS_PERS_MASK, val);
314 if (!ret)
315 data->als_persistence = val;
316 return ret;
317 default:
318 return -EINVAL;
319 }
320}
321
322static IIO_CONST_ATTR_INT_TIME_AVAIL("50 100 200 400 800");
323
324static struct attribute *vcnl4035_attributes[] = {
325 &iio_const_attr_integration_time_available.dev_attr.attr,
326 NULL,
327};
328
329static const struct attribute_group vcnl4035_attribute_group = {
330 .attrs = vcnl4035_attributes,
331};
332
333static const struct iio_info vcnl4035_info = {
334 .read_raw = vcnl4035_read_raw,
335 .write_raw = vcnl4035_write_raw,
336 .read_event_value = vcnl4035_read_thresh,
337 .write_event_value = vcnl4035_write_thresh,
338 .attrs = &vcnl4035_attribute_group,
339};
340
341static const struct iio_event_spec vcnl4035_event_spec[] = {
342 {
343 .type = IIO_EV_TYPE_THRESH,
344 .dir = IIO_EV_DIR_RISING,
345 .mask_separate = BIT(IIO_EV_INFO_VALUE),
346 }, {
347 .type = IIO_EV_TYPE_THRESH,
348 .dir = IIO_EV_DIR_FALLING,
349 .mask_separate = BIT(IIO_EV_INFO_VALUE),
350 }, {
351 .type = IIO_EV_TYPE_THRESH,
352 .dir = IIO_EV_DIR_EITHER,
353 .mask_separate = BIT(IIO_EV_INFO_PERIOD),
354 },
355};
356
357enum vcnl4035_scan_index_order {
358 VCNL4035_CHAN_INDEX_LIGHT,
359 VCNL4035_CHAN_INDEX_WHITE_LED,
360};
361
362static const struct iio_buffer_setup_ops iio_triggered_buffer_setup_ops = {
363 .validate_scan_mask = &iio_validate_scan_mask_onehot,
364};
365
366static const struct iio_chan_spec vcnl4035_channels[] = {
367 {
368 .type = IIO_LIGHT,
369 .channel = 0,
370 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
371 BIT(IIO_CHAN_INFO_INT_TIME) |
372 BIT(IIO_CHAN_INFO_SCALE),
373 .event_spec = vcnl4035_event_spec,
374 .num_event_specs = ARRAY_SIZE(vcnl4035_event_spec),
375 .scan_index = VCNL4035_CHAN_INDEX_LIGHT,
376 .scan_type = {
377 .sign = 'u',
378 .realbits = 16,
379 .storagebits = 16,
380 .endianness = IIO_LE,
381 },
382 },
383 {
384 .type = IIO_INTENSITY,
385 .channel = 1,
386 .modified = 1,
387 .channel2 = IIO_MOD_LIGHT_BOTH,
388 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
389 .scan_index = VCNL4035_CHAN_INDEX_WHITE_LED,
390 .scan_type = {
391 .sign = 'u',
392 .realbits = 16,
393 .storagebits = 16,
394 .endianness = IIO_LE,
395 },
396 },
397};
398
399static int vcnl4035_set_als_power_state(struct vcnl4035_data *data, u8 status)
400{
401 return regmap_update_bits(data->regmap, VCNL4035_ALS_CONF,
402 VCNL4035_MODE_ALS_MASK,
403 status);
404}
405
406static int vcnl4035_init(struct vcnl4035_data *data)
407{
408 int ret;
409 int id;
410
411 ret = regmap_read(data->regmap, VCNL4035_DEV_ID, &id);
412 if (ret < 0) {
413 dev_err(&data->client->dev, "Failed to read DEV_ID register\n");
414 return ret;
415 }
416
417 if (id != VCNL4035_DEV_ID_VAL) {
418 dev_err(&data->client->dev, "Wrong id, got %x, expected %x\n",
419 id, VCNL4035_DEV_ID_VAL);
420 return -ENODEV;
421 }
422
423 ret = vcnl4035_set_als_power_state(data, VCNL4035_MODE_ALS_ENABLE);
424 if (ret < 0)
425 return ret;
426
427
428 ret = regmap_update_bits(data->regmap, VCNL4035_ALS_CONF,
429 VCNL4035_MODE_ALS_WHITE_CHAN,
430 1);
431 if (ret) {
432 dev_err(&data->client->dev, "set white channel enable %d\n",
433 ret);
434 return ret;
435 }
436
437
438 ret = regmap_update_bits(data->regmap, VCNL4035_ALS_CONF,
439 VCNL4035_ALS_IT_MASK,
440 VCNL4035_ALS_IT_DEFAULT);
441 if (ret) {
442 dev_err(&data->client->dev, "set default ALS IT returned %d\n",
443 ret);
444 return ret;
445 }
446 data->als_it_val = VCNL4035_ALS_IT_DEFAULT;
447
448
449 ret = regmap_update_bits(data->regmap, VCNL4035_ALS_CONF,
450 VCNL4035_ALS_PERS_MASK,
451 VCNL4035_ALS_PERS_DEFAULT);
452 if (ret) {
453 dev_err(&data->client->dev, "set default PERS returned %d\n",
454 ret);
455 return ret;
456 }
457 data->als_persistence = VCNL4035_ALS_PERS_DEFAULT;
458
459
460 ret = regmap_write(data->regmap, VCNL4035_ALS_THDH,
461 VCNL4035_ALS_THDH_DEFAULT);
462 if (ret) {
463 dev_err(&data->client->dev, "set default THDH returned %d\n",
464 ret);
465 return ret;
466 }
467 data->als_thresh_high = VCNL4035_ALS_THDH_DEFAULT;
468
469
470 ret = regmap_write(data->regmap, VCNL4035_ALS_THDL,
471 VCNL4035_ALS_THDL_DEFAULT);
472 if (ret) {
473 dev_err(&data->client->dev, "set default THDL returned %d\n",
474 ret);
475 return ret;
476 }
477 data->als_thresh_low = VCNL4035_ALS_THDL_DEFAULT;
478
479 return 0;
480}
481
482static bool vcnl4035_is_volatile_reg(struct device *dev, unsigned int reg)
483{
484 switch (reg) {
485 case VCNL4035_ALS_CONF:
486 case VCNL4035_DEV_ID:
487 return false;
488 default:
489 return true;
490 }
491}
492
493static const struct regmap_config vcnl4035_regmap_config = {
494 .name = VCNL4035_REGMAP_NAME,
495 .reg_bits = 8,
496 .val_bits = 16,
497 .max_register = VCNL4035_DEV_ID,
498 .cache_type = REGCACHE_RBTREE,
499 .volatile_reg = vcnl4035_is_volatile_reg,
500 .val_format_endian = REGMAP_ENDIAN_LITTLE,
501};
502
503static int vcnl4035_probe_trigger(struct iio_dev *indio_dev)
504{
505 int ret;
506 struct vcnl4035_data *data = iio_priv(indio_dev);
507
508 data->drdy_trigger0 = devm_iio_trigger_alloc(
509 indio_dev->dev.parent,
510 "%s-dev%d", indio_dev->name, indio_dev->id);
511 if (!data->drdy_trigger0)
512 return -ENOMEM;
513
514 data->drdy_trigger0->dev.parent = indio_dev->dev.parent;
515 data->drdy_trigger0->ops = &vcnl4035_trigger_ops;
516 iio_trigger_set_drvdata(data->drdy_trigger0, indio_dev);
517 ret = devm_iio_trigger_register(indio_dev->dev.parent,
518 data->drdy_trigger0);
519 if (ret) {
520 dev_err(&data->client->dev, "iio trigger register failed\n");
521 return ret;
522 }
523
524
525 ret = devm_iio_triggered_buffer_setup(indio_dev->dev.parent, indio_dev,
526 NULL, vcnl4035_trigger_consumer_handler,
527 &iio_triggered_buffer_setup_ops);
528 if (ret < 0) {
529 dev_err(&data->client->dev, "iio triggered buffer setup failed\n");
530 return ret;
531 }
532
533
534 ret = devm_request_threaded_irq(&data->client->dev, data->client->irq,
535 NULL, vcnl4035_drdy_irq_thread,
536 IRQF_TRIGGER_LOW | IRQF_ONESHOT,
537 VCNL4035_IRQ_NAME, indio_dev);
538 if (ret < 0)
539 dev_err(&data->client->dev, "request irq %d for trigger0 failed\n",
540 data->client->irq);
541 return ret;
542}
543
544static int vcnl4035_probe(struct i2c_client *client,
545 const struct i2c_device_id *id)
546{
547 struct vcnl4035_data *data;
548 struct iio_dev *indio_dev;
549 struct regmap *regmap;
550 int ret;
551
552 indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data));
553 if (!indio_dev)
554 return -ENOMEM;
555
556 regmap = devm_regmap_init_i2c(client, &vcnl4035_regmap_config);
557 if (IS_ERR(regmap)) {
558 dev_err(&client->dev, "regmap_init failed!\n");
559 return PTR_ERR(regmap);
560 }
561
562 data = iio_priv(indio_dev);
563 i2c_set_clientdata(client, indio_dev);
564 data->client = client;
565 data->regmap = regmap;
566
567 indio_dev->dev.parent = &client->dev;
568 indio_dev->info = &vcnl4035_info;
569 indio_dev->name = VCNL4035_DRV_NAME;
570 indio_dev->channels = vcnl4035_channels;
571 indio_dev->num_channels = ARRAY_SIZE(vcnl4035_channels);
572 indio_dev->modes = INDIO_DIRECT_MODE;
573
574 ret = vcnl4035_init(data);
575 if (ret < 0) {
576 dev_err(&client->dev, "vcnl4035 chip init failed\n");
577 return ret;
578 }
579
580 if (client->irq > 0) {
581 ret = vcnl4035_probe_trigger(indio_dev);
582 if (ret < 0) {
583 dev_err(&client->dev, "vcnl4035 unable init trigger\n");
584 goto fail_poweroff;
585 }
586 }
587
588 ret = pm_runtime_set_active(&client->dev);
589 if (ret < 0)
590 goto fail_poweroff;
591
592 ret = iio_device_register(indio_dev);
593 if (ret < 0)
594 goto fail_poweroff;
595
596 pm_runtime_enable(&client->dev);
597 pm_runtime_set_autosuspend_delay(&client->dev, VCNL4035_SLEEP_DELAY_MS);
598 pm_runtime_use_autosuspend(&client->dev);
599
600 return 0;
601
602fail_poweroff:
603 vcnl4035_set_als_power_state(data, VCNL4035_MODE_ALS_DISABLE);
604 return ret;
605}
606
607static int vcnl4035_remove(struct i2c_client *client)
608{
609 struct iio_dev *indio_dev = i2c_get_clientdata(client);
610
611 pm_runtime_dont_use_autosuspend(&client->dev);
612 pm_runtime_disable(&client->dev);
613 iio_device_unregister(indio_dev);
614 pm_runtime_set_suspended(&client->dev);
615
616 return vcnl4035_set_als_power_state(iio_priv(indio_dev),
617 VCNL4035_MODE_ALS_DISABLE);
618}
619
620static int __maybe_unused vcnl4035_runtime_suspend(struct device *dev)
621{
622 struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
623 struct vcnl4035_data *data = iio_priv(indio_dev);
624 int ret;
625
626 ret = vcnl4035_set_als_power_state(data, VCNL4035_MODE_ALS_DISABLE);
627 regcache_mark_dirty(data->regmap);
628
629 return ret;
630}
631
632static int __maybe_unused vcnl4035_runtime_resume(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 regcache_sync(data->regmap);
639 ret = vcnl4035_set_als_power_state(data, VCNL4035_MODE_ALS_ENABLE);
640 if (ret < 0)
641 return ret;
642
643
644 msleep(data->als_it_val * 100);
645
646 return 0;
647}
648
649static const struct dev_pm_ops vcnl4035_pm_ops = {
650 SET_SYSTEM_SLEEP_PM_OPS(pm_runtime_force_suspend,
651 pm_runtime_force_resume)
652 SET_RUNTIME_PM_OPS(vcnl4035_runtime_suspend,
653 vcnl4035_runtime_resume, NULL)
654};
655
656static const struct of_device_id vcnl4035_of_match[] = {
657 { .compatible = "vishay,vcnl4035", },
658 { }
659};
660MODULE_DEVICE_TABLE(of, vcnl4035_of_match);
661
662static struct i2c_driver vcnl4035_driver = {
663 .driver = {
664 .name = VCNL4035_DRV_NAME,
665 .pm = &vcnl4035_pm_ops,
666 .of_match_table = vcnl4035_of_match,
667 },
668 .probe = vcnl4035_probe,
669 .remove = vcnl4035_remove,
670};
671
672module_i2c_driver(vcnl4035_driver);
673
674MODULE_AUTHOR("Parthiban Nallathambi <pn@denx.de>");
675MODULE_DESCRIPTION("VCNL4035 Ambient Light Sensor driver");
676MODULE_LICENSE("GPL v2");
677
