1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3 * VEML6030 Ambient Light Sensor
4 *
5 * Copyright (c) 2019, Rishi Gupta <gupt21@gmail.com>
6 *
7 * Datasheet: https://www.vishay.com/docs/84366/veml6030.pdf
8 * Appnote-84367: https://www.vishay.com/docs/84367/designingveml6030.pdf
9 */
10
11 #include <linux/module.h>
12 #include <linux/i2c.h>
13 #include <linux/err.h>
14 #include <linux/regmap.h>
15 #include <linux/interrupt.h>
16 #include <linux/pm_runtime.h>
17 #include <linux/iio/iio.h>
18 #include <linux/iio/sysfs.h>
19 #include <linux/iio/events.h>
20
21 /* Device registers */
22 #define VEML6030_REG_ALS_CONF 0x00
23 #define VEML6030_REG_ALS_WH 0x01
24 #define VEML6030_REG_ALS_WL 0x02
25 #define VEML6030_REG_ALS_PSM 0x03
26 #define VEML6030_REG_ALS_DATA 0x04
27 #define VEML6030_REG_WH_DATA 0x05
28 #define VEML6030_REG_ALS_INT 0x06
29
30 /* Bit masks for specific functionality */
31 #define VEML6030_ALS_IT GENMASK(9, 6)
32 #define VEML6030_PSM GENMASK(2, 1)
33 #define VEML6030_ALS_PERS GENMASK(5, 4)
34 #define VEML6030_ALS_GAIN GENMASK(12, 11)
35 #define VEML6030_PSM_EN BIT(0)
36 #define VEML6030_INT_TH_LOW BIT(15)
37 #define VEML6030_INT_TH_HIGH BIT(14)
38 #define VEML6030_ALS_INT_EN BIT(1)
39 #define VEML6030_ALS_SD BIT(0)
40
41 /*
42 * The resolution depends on both gain and integration time. The
43 * cur_resolution stores one of the resolution mentioned in the
44 * table during startup and gets updated whenever integration time
45 * or gain is changed.
46 *
47 * Table 'resolution and maximum detection range' in appnote 84367
48 * is visualized as a 2D array. The cur_gain stores index of gain
49 * in this table (0-3) while the cur_integration_time holds index
50 * of integration time (0-5).
51 */
52 struct veml6030_data {
53 struct i2c_client *client;
54 struct regmap *regmap;
55 int cur_resolution;
56 int cur_gain;
57 int cur_integration_time;
58 };
59
60 /* Integration time available in seconds */
61 static IIO_CONST_ATTR(in_illuminance_integration_time_available,
62 "0.025 0.05 0.1 0.2 0.4 0.8");
63
64 /*
65 * Scale is 1/gain. Value 0.125 is ALS gain x (1/8), 0.25 is
66 * ALS gain x (1/4), 1.0 = ALS gain x 1 and 2.0 is ALS gain x 2.
67 */
68 static IIO_CONST_ATTR(in_illuminance_scale_available,
69 "0.125 0.25 1.0 2.0");
70
71 static struct attribute *veml6030_attributes[] = {
72 &iio_const_attr_in_illuminance_integration_time_available.dev_attr.attr,
73 &iio_const_attr_in_illuminance_scale_available.dev_attr.attr,
74 NULL
75 };
76
77 static const struct attribute_group veml6030_attr_group = {
78 .attrs = veml6030_attributes,
79 };
80
81 /*
82 * Persistence = 1/2/4/8 x integration time
83 * Minimum time for which light readings must stay above configured
84 * threshold to assert the interrupt.
85 */
86 static const char * const period_values[] = {
87 "0.1 0.2 0.4 0.8",
88 "0.2 0.4 0.8 1.6",
89 "0.4 0.8 1.6 3.2",
90 "0.8 1.6 3.2 6.4",
91 "0.05 0.1 0.2 0.4",
92 "0.025 0.050 0.1 0.2"
93 };
94
95 /*
96 * Return list of valid period values in seconds corresponding to
97 * the currently active integration time.
98 */
in_illuminance_period_available_show(struct device * dev,struct device_attribute * attr,char * buf)99 static ssize_t in_illuminance_period_available_show(struct device *dev,
100 struct device_attribute *attr, char *buf)
101 {
102 struct veml6030_data *data = iio_priv(dev_to_iio_dev(dev));
103 int ret, reg, x;
104
105 ret = regmap_read(data->regmap, VEML6030_REG_ALS_CONF, ®);
106 if (ret) {
107 dev_err(&data->client->dev,
108 "can't read als conf register %d\n", ret);
109 return ret;
110 }
111
112 ret = ((reg >> 6) & 0xF);
113 switch (ret) {
114 case 0:
115 case 1:
116 case 2:
117 case 3:
118 x = ret;
119 break;
120 case 8:
121 x = 4;
122 break;
123 case 12:
124 x = 5;
125 break;
126 default:
127 return -EINVAL;
128 }
129
130 return sysfs_emit(buf, "%s\n", period_values[x]);
131 }
132
133 static IIO_DEVICE_ATTR_RO(in_illuminance_period_available, 0);
134
135 static struct attribute *veml6030_event_attributes[] = {
136 &iio_dev_attr_in_illuminance_period_available.dev_attr.attr,
137 NULL
138 };
139
140 static const struct attribute_group veml6030_event_attr_group = {
141 .attrs = veml6030_event_attributes,
142 };
143
veml6030_als_pwr_on(struct veml6030_data * data)144 static int veml6030_als_pwr_on(struct veml6030_data *data)
145 {
146 return regmap_update_bits(data->regmap, VEML6030_REG_ALS_CONF,
147 VEML6030_ALS_SD, 0);
148 }
149
veml6030_als_shut_down(struct veml6030_data * data)150 static int veml6030_als_shut_down(struct veml6030_data *data)
151 {
152 return regmap_update_bits(data->regmap, VEML6030_REG_ALS_CONF,
153 VEML6030_ALS_SD, 1);
154 }
155
veml6030_als_shut_down_action(void * data)156 static void veml6030_als_shut_down_action(void *data)
157 {
158 veml6030_als_shut_down(data);
159 }
160
161 static const struct iio_event_spec veml6030_event_spec[] = {
162 {
163 .type = IIO_EV_TYPE_THRESH,
164 .dir = IIO_EV_DIR_RISING,
165 .mask_separate = BIT(IIO_EV_INFO_VALUE),
166 }, {
167 .type = IIO_EV_TYPE_THRESH,
168 .dir = IIO_EV_DIR_FALLING,
169 .mask_separate = BIT(IIO_EV_INFO_VALUE),
170 }, {
171 .type = IIO_EV_TYPE_THRESH,
172 .dir = IIO_EV_DIR_EITHER,
173 .mask_separate = BIT(IIO_EV_INFO_PERIOD) |
174 BIT(IIO_EV_INFO_ENABLE),
175 },
176 };
177
178 /* Channel number */
179 enum veml6030_chan {
180 CH_ALS,
181 CH_WHITE,
182 };
183
184 static const struct iio_chan_spec veml6030_channels[] = {
185 {
186 .type = IIO_LIGHT,
187 .channel = CH_ALS,
188 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
189 BIT(IIO_CHAN_INFO_PROCESSED) |
190 BIT(IIO_CHAN_INFO_INT_TIME) |
191 BIT(IIO_CHAN_INFO_SCALE),
192 .event_spec = veml6030_event_spec,
193 .num_event_specs = ARRAY_SIZE(veml6030_event_spec),
194 },
195 {
196 .type = IIO_INTENSITY,
197 .channel = CH_WHITE,
198 .modified = 1,
199 .channel2 = IIO_MOD_LIGHT_BOTH,
200 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
201 BIT(IIO_CHAN_INFO_PROCESSED),
202 },
203 };
204
205 static const struct regmap_config veml6030_regmap_config = {
206 .name = "veml6030_regmap",
207 .reg_bits = 8,
208 .val_bits = 16,
209 .max_register = VEML6030_REG_ALS_INT,
210 .val_format_endian = REGMAP_ENDIAN_LITTLE,
211 };
212
veml6030_get_intgrn_tm(struct iio_dev * indio_dev,int * val,int * val2)213 static int veml6030_get_intgrn_tm(struct iio_dev *indio_dev,
214 int *val, int *val2)
215 {
216 int ret, reg;
217 struct veml6030_data *data = iio_priv(indio_dev);
218
219 ret = regmap_read(data->regmap, VEML6030_REG_ALS_CONF, ®);
220 if (ret) {
221 dev_err(&data->client->dev,
222 "can't read als conf register %d\n", ret);
223 return ret;
224 }
225
226 switch ((reg >> 6) & 0xF) {
227 case 0:
228 *val2 = 100000;
229 break;
230 case 1:
231 *val2 = 200000;
232 break;
233 case 2:
234 *val2 = 400000;
235 break;
236 case 3:
237 *val2 = 800000;
238 break;
239 case 8:
240 *val2 = 50000;
241 break;
242 case 12:
243 *val2 = 25000;
244 break;
245 default:
246 return -EINVAL;
247 }
248
249 *val = 0;
250 return IIO_VAL_INT_PLUS_MICRO;
251 }
252
veml6030_set_intgrn_tm(struct iio_dev * indio_dev,int val,int val2)253 static int veml6030_set_intgrn_tm(struct iio_dev *indio_dev,
254 int val, int val2)
255 {
256 int ret, new_int_time, int_idx;
257 struct veml6030_data *data = iio_priv(indio_dev);
258
259 if (val)
260 return -EINVAL;
261
262 switch (val2) {
263 case 25000:
264 new_int_time = 0x300;
265 int_idx = 5;
266 break;
267 case 50000:
268 new_int_time = 0x200;
269 int_idx = 4;
270 break;
271 case 100000:
272 new_int_time = 0x00;
273 int_idx = 3;
274 break;
275 case 200000:
276 new_int_time = 0x40;
277 int_idx = 2;
278 break;
279 case 400000:
280 new_int_time = 0x80;
281 int_idx = 1;
282 break;
283 case 800000:
284 new_int_time = 0xC0;
285 int_idx = 0;
286 break;
287 default:
288 return -EINVAL;
289 }
290
291 ret = regmap_update_bits(data->regmap, VEML6030_REG_ALS_CONF,
292 VEML6030_ALS_IT, new_int_time);
293 if (ret) {
294 dev_err(&data->client->dev,
295 "can't update als integration time %d\n", ret);
296 return ret;
297 }
298
299 /*
300 * Cache current integration time and update resolution. For every
301 * increase in integration time to next level, resolution is halved
302 * and vice-versa.
303 */
304 if (data->cur_integration_time < int_idx)
305 data->cur_resolution <<= int_idx - data->cur_integration_time;
306 else if (data->cur_integration_time > int_idx)
307 data->cur_resolution >>= data->cur_integration_time - int_idx;
308
309 data->cur_integration_time = int_idx;
310
311 return ret;
312 }
313
veml6030_read_persistence(struct iio_dev * indio_dev,int * val,int * val2)314 static int veml6030_read_persistence(struct iio_dev *indio_dev,
315 int *val, int *val2)
316 {
317 int ret, reg, period, x, y;
318 struct veml6030_data *data = iio_priv(indio_dev);
319
320 ret = veml6030_get_intgrn_tm(indio_dev, &x, &y);
321 if (ret < 0)
322 return ret;
323
324 ret = regmap_read(data->regmap, VEML6030_REG_ALS_CONF, ®);
325 if (ret) {
326 dev_err(&data->client->dev,
327 "can't read als conf register %d\n", ret);
328 }
329
330 /* integration time multiplied by 1/2/4/8 */
331 period = y * (1 << ((reg >> 4) & 0x03));
332
333 *val = period / 1000000;
334 *val2 = period % 1000000;
335
336 return IIO_VAL_INT_PLUS_MICRO;
337 }
338
veml6030_write_persistence(struct iio_dev * indio_dev,int val,int val2)339 static int veml6030_write_persistence(struct iio_dev *indio_dev,
340 int val, int val2)
341 {
342 int ret, period, x, y;
343 struct veml6030_data *data = iio_priv(indio_dev);
344
345 ret = veml6030_get_intgrn_tm(indio_dev, &x, &y);
346 if (ret < 0)
347 return ret;
348
349 if (!val) {
350 period = val2 / y;
351 } else {
352 if ((val == 1) && (val2 == 600000))
353 period = 1600000 / y;
354 else if ((val == 3) && (val2 == 200000))
355 period = 3200000 / y;
356 else if ((val == 6) && (val2 == 400000))
357 period = 6400000 / y;
358 else
359 period = -1;
360 }
361
362 if (period <= 0 || period > 8 || hweight8(period) != 1)
363 return -EINVAL;
364
365 ret = regmap_update_bits(data->regmap, VEML6030_REG_ALS_CONF,
366 VEML6030_ALS_PERS, (ffs(period) - 1) << 4);
367 if (ret)
368 dev_err(&data->client->dev,
369 "can't set persistence value %d\n", ret);
370
371 return ret;
372 }
373
veml6030_set_als_gain(struct iio_dev * indio_dev,int val,int val2)374 static int veml6030_set_als_gain(struct iio_dev *indio_dev,
375 int val, int val2)
376 {
377 int ret, new_gain, gain_idx;
378 struct veml6030_data *data = iio_priv(indio_dev);
379
380 if (val == 0 && val2 == 125000) {
381 new_gain = 0x1000; /* 0x02 << 11 */
382 gain_idx = 3;
383 } else if (val == 0 && val2 == 250000) {
384 new_gain = 0x1800;
385 gain_idx = 2;
386 } else if (val == 1 && val2 == 0) {
387 new_gain = 0x00;
388 gain_idx = 1;
389 } else if (val == 2 && val2 == 0) {
390 new_gain = 0x800;
391 gain_idx = 0;
392 } else {
393 return -EINVAL;
394 }
395
396 ret = regmap_update_bits(data->regmap, VEML6030_REG_ALS_CONF,
397 VEML6030_ALS_GAIN, new_gain);
398 if (ret) {
399 dev_err(&data->client->dev,
400 "can't set als gain %d\n", ret);
401 return ret;
402 }
403
404 /*
405 * Cache currently set gain & update resolution. For every
406 * increase in the gain to next level, resolution is halved
407 * and vice-versa.
408 */
409 if (data->cur_gain < gain_idx)
410 data->cur_resolution <<= gain_idx - data->cur_gain;
411 else if (data->cur_gain > gain_idx)
412 data->cur_resolution >>= data->cur_gain - gain_idx;
413
414 data->cur_gain = gain_idx;
415
416 return ret;
417 }
418
veml6030_get_als_gain(struct iio_dev * indio_dev,int * val,int * val2)419 static int veml6030_get_als_gain(struct iio_dev *indio_dev,
420 int *val, int *val2)
421 {
422 int ret, reg;
423 struct veml6030_data *data = iio_priv(indio_dev);
424
425 ret = regmap_read(data->regmap, VEML6030_REG_ALS_CONF, ®);
426 if (ret) {
427 dev_err(&data->client->dev,
428 "can't read als conf register %d\n", ret);
429 return ret;
430 }
431
432 switch ((reg >> 11) & 0x03) {
433 case 0:
434 *val = 1;
435 *val2 = 0;
436 break;
437 case 1:
438 *val = 2;
439 *val2 = 0;
440 break;
441 case 2:
442 *val = 0;
443 *val2 = 125000;
444 break;
445 case 3:
446 *val = 0;
447 *val2 = 250000;
448 break;
449 default:
450 return -EINVAL;
451 }
452
453 return IIO_VAL_INT_PLUS_MICRO;
454 }
455
veml6030_read_thresh(struct iio_dev * indio_dev,int * val,int * val2,int dir)456 static int veml6030_read_thresh(struct iio_dev *indio_dev,
457 int *val, int *val2, int dir)
458 {
459 int ret, reg;
460 struct veml6030_data *data = iio_priv(indio_dev);
461
462 if (dir == IIO_EV_DIR_RISING)
463 ret = regmap_read(data->regmap, VEML6030_REG_ALS_WH, ®);
464 else
465 ret = regmap_read(data->regmap, VEML6030_REG_ALS_WL, ®);
466 if (ret) {
467 dev_err(&data->client->dev,
468 "can't read als threshold value %d\n", ret);
469 return ret;
470 }
471
472 *val = reg & 0xffff;
473 return IIO_VAL_INT;
474 }
475
veml6030_write_thresh(struct iio_dev * indio_dev,int val,int val2,int dir)476 static int veml6030_write_thresh(struct iio_dev *indio_dev,
477 int val, int val2, int dir)
478 {
479 int ret;
480 struct veml6030_data *data = iio_priv(indio_dev);
481
482 if (val > 0xFFFF || val < 0 || val2)
483 return -EINVAL;
484
485 if (dir == IIO_EV_DIR_RISING) {
486 ret = regmap_write(data->regmap, VEML6030_REG_ALS_WH, val);
487 if (ret)
488 dev_err(&data->client->dev,
489 "can't set high threshold %d\n", ret);
490 } else {
491 ret = regmap_write(data->regmap, VEML6030_REG_ALS_WL, val);
492 if (ret)
493 dev_err(&data->client->dev,
494 "can't set low threshold %d\n", ret);
495 }
496
497 return ret;
498 }
499
500 /*
501 * Provide both raw as well as light reading in lux.
502 * light (in lux) = resolution * raw reading
503 */
veml6030_read_raw(struct iio_dev * indio_dev,struct iio_chan_spec const * chan,int * val,int * val2,long mask)504 static int veml6030_read_raw(struct iio_dev *indio_dev,
505 struct iio_chan_spec const *chan, int *val,
506 int *val2, long mask)
507 {
508 int ret, reg;
509 struct veml6030_data *data = iio_priv(indio_dev);
510 struct regmap *regmap = data->regmap;
511 struct device *dev = &data->client->dev;
512
513 switch (mask) {
514 case IIO_CHAN_INFO_RAW:
515 case IIO_CHAN_INFO_PROCESSED:
516 switch (chan->type) {
517 case IIO_LIGHT:
518 ret = regmap_read(regmap, VEML6030_REG_ALS_DATA, ®);
519 if (ret < 0) {
520 dev_err(dev, "can't read als data %d\n", ret);
521 return ret;
522 }
523 if (mask == IIO_CHAN_INFO_PROCESSED) {
524 *val = (reg * data->cur_resolution) / 10000;
525 *val2 = (reg * data->cur_resolution) % 10000 * 100;
526 return IIO_VAL_INT_PLUS_MICRO;
527 }
528 *val = reg;
529 return IIO_VAL_INT;
530 case IIO_INTENSITY:
531 ret = regmap_read(regmap, VEML6030_REG_WH_DATA, ®);
532 if (ret < 0) {
533 dev_err(dev, "can't read white data %d\n", ret);
534 return ret;
535 }
536 if (mask == IIO_CHAN_INFO_PROCESSED) {
537 *val = (reg * data->cur_resolution) / 10000;
538 *val2 = (reg * data->cur_resolution) % 10000;
539 return IIO_VAL_INT_PLUS_MICRO;
540 }
541 *val = reg;
542 return IIO_VAL_INT;
543 default:
544 return -EINVAL;
545 }
546 case IIO_CHAN_INFO_INT_TIME:
547 if (chan->type == IIO_LIGHT)
548 return veml6030_get_intgrn_tm(indio_dev, val, val2);
549 return -EINVAL;
550 case IIO_CHAN_INFO_SCALE:
551 if (chan->type == IIO_LIGHT)
552 return veml6030_get_als_gain(indio_dev, val, val2);
553 return -EINVAL;
554 default:
555 return -EINVAL;
556 }
557 }
558
veml6030_write_raw(struct iio_dev * indio_dev,struct iio_chan_spec const * chan,int val,int val2,long mask)559 static int veml6030_write_raw(struct iio_dev *indio_dev,
560 struct iio_chan_spec const *chan,
561 int val, int val2, long mask)
562 {
563 switch (mask) {
564 case IIO_CHAN_INFO_INT_TIME:
565 switch (chan->type) {
566 case IIO_LIGHT:
567 return veml6030_set_intgrn_tm(indio_dev, val, val2);
568 default:
569 return -EINVAL;
570 }
571 case IIO_CHAN_INFO_SCALE:
572 switch (chan->type) {
573 case IIO_LIGHT:
574 return veml6030_set_als_gain(indio_dev, val, val2);
575 default:
576 return -EINVAL;
577 }
578 default:
579 return -EINVAL;
580 }
581 }
582
veml6030_read_event_val(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)583 static int veml6030_read_event_val(struct iio_dev *indio_dev,
584 const struct iio_chan_spec *chan, enum iio_event_type type,
585 enum iio_event_direction dir, enum iio_event_info info,
586 int *val, int *val2)
587 {
588 switch (info) {
589 case IIO_EV_INFO_VALUE:
590 switch (dir) {
591 case IIO_EV_DIR_RISING:
592 case IIO_EV_DIR_FALLING:
593 return veml6030_read_thresh(indio_dev, val, val2, dir);
594 default:
595 return -EINVAL;
596 }
597 break;
598 case IIO_EV_INFO_PERIOD:
599 return veml6030_read_persistence(indio_dev, val, val2);
600 default:
601 return -EINVAL;
602 }
603 }
604
veml6030_write_event_val(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)605 static int veml6030_write_event_val(struct iio_dev *indio_dev,
606 const struct iio_chan_spec *chan, enum iio_event_type type,
607 enum iio_event_direction dir, enum iio_event_info info,
608 int val, int val2)
609 {
610 switch (info) {
611 case IIO_EV_INFO_VALUE:
612 return veml6030_write_thresh(indio_dev, val, val2, dir);
613 case IIO_EV_INFO_PERIOD:
614 return veml6030_write_persistence(indio_dev, val, val2);
615 default:
616 return -EINVAL;
617 }
618 }
619
veml6030_read_interrupt_config(struct iio_dev * indio_dev,const struct iio_chan_spec * chan,enum iio_event_type type,enum iio_event_direction dir)620 static int veml6030_read_interrupt_config(struct iio_dev *indio_dev,
621 const struct iio_chan_spec *chan, enum iio_event_type type,
622 enum iio_event_direction dir)
623 {
624 int ret, reg;
625 struct veml6030_data *data = iio_priv(indio_dev);
626
627 ret = regmap_read(data->regmap, VEML6030_REG_ALS_CONF, ®);
628 if (ret) {
629 dev_err(&data->client->dev,
630 "can't read als conf register %d\n", ret);
631 return ret;
632 }
633
634 if (reg & VEML6030_ALS_INT_EN)
635 return 1;
636 else
637 return 0;
638 }
639
640 /*
641 * Sensor should not be measuring light when interrupt is configured.
642 * Therefore correct sequence to configure interrupt functionality is:
643 * shut down -> enable/disable interrupt -> power on
644 *
645 * state = 1 enables interrupt, state = 0 disables interrupt
646 */
veml6030_write_interrupt_config(struct iio_dev * indio_dev,const struct iio_chan_spec * chan,enum iio_event_type type,enum iio_event_direction dir,int state)647 static int veml6030_write_interrupt_config(struct iio_dev *indio_dev,
648 const struct iio_chan_spec *chan, enum iio_event_type type,
649 enum iio_event_direction dir, int state)
650 {
651 int ret;
652 struct veml6030_data *data = iio_priv(indio_dev);
653
654 if (state < 0 || state > 1)
655 return -EINVAL;
656
657 ret = veml6030_als_shut_down(data);
658 if (ret < 0) {
659 dev_err(&data->client->dev,
660 "can't disable als to configure interrupt %d\n", ret);
661 return ret;
662 }
663
664 /* enable interrupt + power on */
665 ret = regmap_update_bits(data->regmap, VEML6030_REG_ALS_CONF,
666 VEML6030_ALS_INT_EN | VEML6030_ALS_SD, state << 1);
667 if (ret)
668 dev_err(&data->client->dev,
669 "can't enable interrupt & poweron als %d\n", ret);
670
671 return ret;
672 }
673
674 static const struct iio_info veml6030_info = {
675 .read_raw = veml6030_read_raw,
676 .write_raw = veml6030_write_raw,
677 .read_event_value = veml6030_read_event_val,
678 .write_event_value = veml6030_write_event_val,
679 .read_event_config = veml6030_read_interrupt_config,
680 .write_event_config = veml6030_write_interrupt_config,
681 .attrs = &veml6030_attr_group,
682 .event_attrs = &veml6030_event_attr_group,
683 };
684
685 static const struct iio_info veml6030_info_no_irq = {
686 .read_raw = veml6030_read_raw,
687 .write_raw = veml6030_write_raw,
688 .attrs = &veml6030_attr_group,
689 };
690
veml6030_event_handler(int irq,void * private)691 static irqreturn_t veml6030_event_handler(int irq, void *private)
692 {
693 int ret, reg, evtdir;
694 struct iio_dev *indio_dev = private;
695 struct veml6030_data *data = iio_priv(indio_dev);
696
697 ret = regmap_read(data->regmap, VEML6030_REG_ALS_INT, ®);
698 if (ret) {
699 dev_err(&data->client->dev,
700 "can't read als interrupt register %d\n", ret);
701 return IRQ_HANDLED;
702 }
703
704 /* Spurious interrupt handling */
705 if (!(reg & (VEML6030_INT_TH_HIGH | VEML6030_INT_TH_LOW)))
706 return IRQ_NONE;
707
708 if (reg & VEML6030_INT_TH_HIGH)
709 evtdir = IIO_EV_DIR_RISING;
710 else
711 evtdir = IIO_EV_DIR_FALLING;
712
713 iio_push_event(indio_dev, IIO_UNMOD_EVENT_CODE(IIO_INTENSITY,
714 0, IIO_EV_TYPE_THRESH, evtdir),
715 iio_get_time_ns(indio_dev));
716
717 return IRQ_HANDLED;
718 }
719
720 /*
721 * Set ALS gain to 1/8, integration time to 100 ms, PSM to mode 2,
722 * persistence to 1 x integration time and the threshold
723 * interrupt disabled by default. First shutdown the sensor,
724 * update registers and then power on the sensor.
725 */
veml6030_hw_init(struct iio_dev * indio_dev)726 static int veml6030_hw_init(struct iio_dev *indio_dev)
727 {
728 int ret, val;
729 struct veml6030_data *data = iio_priv(indio_dev);
730 struct i2c_client *client = data->client;
731
732 ret = veml6030_als_shut_down(data);
733 if (ret) {
734 dev_err(&client->dev, "can't shutdown als %d\n", ret);
735 return ret;
736 }
737
738 ret = regmap_write(data->regmap, VEML6030_REG_ALS_CONF, 0x1001);
739 if (ret) {
740 dev_err(&client->dev, "can't setup als configs %d\n", ret);
741 return ret;
742 }
743
744 ret = regmap_update_bits(data->regmap, VEML6030_REG_ALS_PSM,
745 VEML6030_PSM | VEML6030_PSM_EN, 0x03);
746 if (ret) {
747 dev_err(&client->dev, "can't setup default PSM %d\n", ret);
748 return ret;
749 }
750
751 ret = regmap_write(data->regmap, VEML6030_REG_ALS_WH, 0xFFFF);
752 if (ret) {
753 dev_err(&client->dev, "can't setup high threshold %d\n", ret);
754 return ret;
755 }
756
757 ret = regmap_write(data->regmap, VEML6030_REG_ALS_WL, 0x0000);
758 if (ret) {
759 dev_err(&client->dev, "can't setup low threshold %d\n", ret);
760 return ret;
761 }
762
763 ret = veml6030_als_pwr_on(data);
764 if (ret) {
765 dev_err(&client->dev, "can't poweron als %d\n", ret);
766 return ret;
767 }
768
769 /* Wait 4 ms to let processor & oscillator start correctly */
770 usleep_range(4000, 4002);
771
772 /* Clear stale interrupt status bits if any during start */
773 ret = regmap_read(data->regmap, VEML6030_REG_ALS_INT, &val);
774 if (ret < 0) {
775 dev_err(&client->dev,
776 "can't clear als interrupt status %d\n", ret);
777 return ret;
778 }
779
780 /* Cache currently active measurement parameters */
781 data->cur_gain = 3;
782 data->cur_resolution = 5376;
783 data->cur_integration_time = 3;
784
785 return ret;
786 }
787
veml6030_probe(struct i2c_client * client)788 static int veml6030_probe(struct i2c_client *client)
789 {
790 int ret;
791 struct veml6030_data *data;
792 struct iio_dev *indio_dev;
793 struct regmap *regmap;
794
795 if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
796 dev_err(&client->dev, "i2c adapter doesn't support plain i2c\n");
797 return -EOPNOTSUPP;
798 }
799
800 regmap = devm_regmap_init_i2c(client, &veml6030_regmap_config);
801 if (IS_ERR(regmap)) {
802 dev_err(&client->dev, "can't setup regmap\n");
803 return PTR_ERR(regmap);
804 }
805
806 indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data));
807 if (!indio_dev)
808 return -ENOMEM;
809
810 data = iio_priv(indio_dev);
811 i2c_set_clientdata(client, indio_dev);
812 data->client = client;
813 data->regmap = regmap;
814
815 indio_dev->name = "veml6030";
816 indio_dev->channels = veml6030_channels;
817 indio_dev->num_channels = ARRAY_SIZE(veml6030_channels);
818 indio_dev->modes = INDIO_DIRECT_MODE;
819
820 if (client->irq) {
821 ret = devm_request_threaded_irq(&client->dev, client->irq,
822 NULL, veml6030_event_handler,
823 IRQF_TRIGGER_LOW | IRQF_ONESHOT,
824 "veml6030", indio_dev);
825 if (ret < 0) {
826 dev_err(&client->dev,
827 "irq %d request failed\n", client->irq);
828 return ret;
829 }
830 indio_dev->info = &veml6030_info;
831 } else {
832 indio_dev->info = &veml6030_info_no_irq;
833 }
834
835 ret = veml6030_hw_init(indio_dev);
836 if (ret < 0)
837 return ret;
838
839 ret = devm_add_action_or_reset(&client->dev,
840 veml6030_als_shut_down_action, data);
841 if (ret < 0)
842 return ret;
843
844 return devm_iio_device_register(&client->dev, indio_dev);
845 }
846
veml6030_runtime_suspend(struct device * dev)847 static int veml6030_runtime_suspend(struct device *dev)
848 {
849 int ret;
850 struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
851 struct veml6030_data *data = iio_priv(indio_dev);
852
853 ret = veml6030_als_shut_down(data);
854 if (ret < 0)
855 dev_err(&data->client->dev, "can't suspend als %d\n", ret);
856
857 return ret;
858 }
859
veml6030_runtime_resume(struct device * dev)860 static int veml6030_runtime_resume(struct device *dev)
861 {
862 int ret;
863 struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
864 struct veml6030_data *data = iio_priv(indio_dev);
865
866 ret = veml6030_als_pwr_on(data);
867 if (ret < 0)
868 dev_err(&data->client->dev, "can't resume als %d\n", ret);
869
870 return ret;
871 }
872
873 static DEFINE_RUNTIME_DEV_PM_OPS(veml6030_pm_ops, veml6030_runtime_suspend,
874 veml6030_runtime_resume, NULL);
875
876 static const struct of_device_id veml6030_of_match[] = {
877 { .compatible = "vishay,veml6030" },
878 { }
879 };
880 MODULE_DEVICE_TABLE(of, veml6030_of_match);
881
882 static const struct i2c_device_id veml6030_id[] = {
883 { "veml6030", 0 },
884 { }
885 };
886 MODULE_DEVICE_TABLE(i2c, veml6030_id);
887
888 static struct i2c_driver veml6030_driver = {
889 .driver = {
890 .name = "veml6030",
891 .of_match_table = veml6030_of_match,
892 .pm = pm_ptr(&veml6030_pm_ops),
893 },
894 .probe = veml6030_probe,
895 .id_table = veml6030_id,
896 };
897 module_i2c_driver(veml6030_driver);
898
899 MODULE_AUTHOR("Rishi Gupta <gupt21@gmail.com>");
900 MODULE_DESCRIPTION("VEML6030 Ambient Light Sensor");
901 MODULE_LICENSE("GPL v2");
902