1
2
3
4
5
6
7
8#include <linux/device.h>
9#include <linux/iio/events.h>
10#include <linux/iio/iio.h>
11#include <linux/kernel.h>
12#include <linux/mfd/iqs62x.h>
13#include <linux/module.h>
14#include <linux/mutex.h>
15#include <linux/notifier.h>
16#include <linux/platform_device.h>
17#include <linux/regmap.h>
18
19#define IQS621_ALS_FLAGS_LIGHT BIT(7)
20#define IQS621_ALS_FLAGS_RANGE GENMASK(3, 0)
21
22#define IQS621_ALS_UI_OUT 0x17
23
24#define IQS621_ALS_THRESH_DARK 0x80
25#define IQS621_ALS_THRESH_LIGHT 0x81
26
27#define IQS622_IR_RANGE 0x15
28#define IQS622_IR_FLAGS 0x16
29#define IQS622_IR_FLAGS_TOUCH BIT(1)
30#define IQS622_IR_FLAGS_PROX BIT(0)
31
32#define IQS622_IR_UI_OUT 0x17
33
34#define IQS622_IR_THRESH_PROX 0x91
35#define IQS622_IR_THRESH_TOUCH 0x92
36
37struct iqs621_als_private {
38 struct iqs62x_core *iqs62x;
39 struct iio_dev *indio_dev;
40 struct notifier_block notifier;
41 struct mutex lock;
42 bool light_en;
43 bool range_en;
44 bool prox_en;
45 u8 als_flags;
46 u8 ir_flags_mask;
47 u8 ir_flags;
48 u8 thresh_light;
49 u8 thresh_dark;
50 u8 thresh_prox;
51};
52
53static int iqs621_als_init(struct iqs621_als_private *iqs621_als)
54{
55 struct iqs62x_core *iqs62x = iqs621_als->iqs62x;
56 unsigned int event_mask = 0;
57 int ret;
58
59 switch (iqs621_als->ir_flags_mask) {
60 case IQS622_IR_FLAGS_TOUCH:
61 ret = regmap_write(iqs62x->regmap, IQS622_IR_THRESH_TOUCH,
62 iqs621_als->thresh_prox);
63 break;
64
65 case IQS622_IR_FLAGS_PROX:
66 ret = regmap_write(iqs62x->regmap, IQS622_IR_THRESH_PROX,
67 iqs621_als->thresh_prox);
68 break;
69
70 default:
71 ret = regmap_write(iqs62x->regmap, IQS621_ALS_THRESH_LIGHT,
72 iqs621_als->thresh_light);
73 if (ret)
74 return ret;
75
76 ret = regmap_write(iqs62x->regmap, IQS621_ALS_THRESH_DARK,
77 iqs621_als->thresh_dark);
78 }
79
80 if (ret)
81 return ret;
82
83 if (iqs621_als->light_en || iqs621_als->range_en)
84 event_mask |= iqs62x->dev_desc->als_mask;
85
86 if (iqs621_als->prox_en)
87 event_mask |= iqs62x->dev_desc->ir_mask;
88
89 return regmap_update_bits(iqs62x->regmap, IQS620_GLBL_EVENT_MASK,
90 event_mask, 0);
91}
92
93static int iqs621_als_notifier(struct notifier_block *notifier,
94 unsigned long event_flags, void *context)
95{
96 struct iqs62x_event_data *event_data = context;
97 struct iqs621_als_private *iqs621_als;
98 struct iio_dev *indio_dev;
99 bool light_new, light_old;
100 bool prox_new, prox_old;
101 u8 range_new, range_old;
102 s64 timestamp;
103 int ret;
104
105 iqs621_als = container_of(notifier, struct iqs621_als_private,
106 notifier);
107 indio_dev = iqs621_als->indio_dev;
108 timestamp = iio_get_time_ns(indio_dev);
109
110 mutex_lock(&iqs621_als->lock);
111
112 if (event_flags & BIT(IQS62X_EVENT_SYS_RESET)) {
113 ret = iqs621_als_init(iqs621_als);
114 if (ret) {
115 dev_err(indio_dev->dev.parent,
116 "Failed to re-initialize device: %d\n", ret);
117 ret = NOTIFY_BAD;
118 } else {
119 ret = NOTIFY_OK;
120 }
121
122 goto err_mutex;
123 }
124
125 if (!iqs621_als->light_en && !iqs621_als->range_en &&
126 !iqs621_als->prox_en) {
127 ret = NOTIFY_DONE;
128 goto err_mutex;
129 }
130
131
132 light_new = event_data->als_flags & IQS621_ALS_FLAGS_LIGHT;
133 light_old = iqs621_als->als_flags & IQS621_ALS_FLAGS_LIGHT;
134
135 if (iqs621_als->light_en && light_new && !light_old)
136 iio_push_event(indio_dev,
137 IIO_UNMOD_EVENT_CODE(IIO_LIGHT, 0,
138 IIO_EV_TYPE_THRESH,
139 IIO_EV_DIR_RISING),
140 timestamp);
141 else if (iqs621_als->light_en && !light_new && light_old)
142 iio_push_event(indio_dev,
143 IIO_UNMOD_EVENT_CODE(IIO_LIGHT, 0,
144 IIO_EV_TYPE_THRESH,
145 IIO_EV_DIR_FALLING),
146 timestamp);
147
148
149 range_new = event_data->als_flags & IQS621_ALS_FLAGS_RANGE;
150 range_old = iqs621_als->als_flags & IQS621_ALS_FLAGS_RANGE;
151
152 if (iqs621_als->range_en && (range_new > range_old))
153 iio_push_event(indio_dev,
154 IIO_UNMOD_EVENT_CODE(IIO_INTENSITY, 0,
155 IIO_EV_TYPE_CHANGE,
156 IIO_EV_DIR_RISING),
157 timestamp);
158 else if (iqs621_als->range_en && (range_new < range_old))
159 iio_push_event(indio_dev,
160 IIO_UNMOD_EVENT_CODE(IIO_INTENSITY, 0,
161 IIO_EV_TYPE_CHANGE,
162 IIO_EV_DIR_FALLING),
163 timestamp);
164
165
166 prox_new = event_data->ir_flags & iqs621_als->ir_flags_mask;
167 prox_old = iqs621_als->ir_flags & iqs621_als->ir_flags_mask;
168
169 if (iqs621_als->prox_en && prox_new && !prox_old)
170 iio_push_event(indio_dev,
171 IIO_UNMOD_EVENT_CODE(IIO_PROXIMITY, 0,
172 IIO_EV_TYPE_THRESH,
173 IIO_EV_DIR_RISING),
174 timestamp);
175 else if (iqs621_als->prox_en && !prox_new && prox_old)
176 iio_push_event(indio_dev,
177 IIO_UNMOD_EVENT_CODE(IIO_PROXIMITY, 0,
178 IIO_EV_TYPE_THRESH,
179 IIO_EV_DIR_FALLING),
180 timestamp);
181
182 iqs621_als->als_flags = event_data->als_flags;
183 iqs621_als->ir_flags = event_data->ir_flags;
184 ret = NOTIFY_OK;
185
186err_mutex:
187 mutex_unlock(&iqs621_als->lock);
188
189 return ret;
190}
191
192static void iqs621_als_notifier_unregister(void *context)
193{
194 struct iqs621_als_private *iqs621_als = context;
195 struct iio_dev *indio_dev = iqs621_als->indio_dev;
196 int ret;
197
198 ret = blocking_notifier_chain_unregister(&iqs621_als->iqs62x->nh,
199 &iqs621_als->notifier);
200 if (ret)
201 dev_err(indio_dev->dev.parent,
202 "Failed to unregister notifier: %d\n", ret);
203}
204
205static int iqs621_als_read_raw(struct iio_dev *indio_dev,
206 struct iio_chan_spec const *chan,
207 int *val, int *val2, long mask)
208{
209 struct iqs621_als_private *iqs621_als = iio_priv(indio_dev);
210 struct iqs62x_core *iqs62x = iqs621_als->iqs62x;
211 int ret;
212 __le16 val_buf;
213
214 switch (chan->type) {
215 case IIO_INTENSITY:
216 ret = regmap_read(iqs62x->regmap, chan->address, val);
217 if (ret)
218 return ret;
219
220 *val &= IQS621_ALS_FLAGS_RANGE;
221 return IIO_VAL_INT;
222
223 case IIO_PROXIMITY:
224 case IIO_LIGHT:
225 ret = regmap_raw_read(iqs62x->regmap, chan->address, &val_buf,
226 sizeof(val_buf));
227 if (ret)
228 return ret;
229
230 *val = le16_to_cpu(val_buf);
231 return IIO_VAL_INT;
232
233 default:
234 return -EINVAL;
235 }
236}
237
238static int iqs621_als_read_event_config(struct iio_dev *indio_dev,
239 const struct iio_chan_spec *chan,
240 enum iio_event_type type,
241 enum iio_event_direction dir)
242{
243 struct iqs621_als_private *iqs621_als = iio_priv(indio_dev);
244 int ret;
245
246 mutex_lock(&iqs621_als->lock);
247
248 switch (chan->type) {
249 case IIO_LIGHT:
250 ret = iqs621_als->light_en;
251 break;
252
253 case IIO_INTENSITY:
254 ret = iqs621_als->range_en;
255 break;
256
257 case IIO_PROXIMITY:
258 ret = iqs621_als->prox_en;
259 break;
260
261 default:
262 ret = -EINVAL;
263 }
264
265 mutex_unlock(&iqs621_als->lock);
266
267 return ret;
268}
269
270static int iqs621_als_write_event_config(struct iio_dev *indio_dev,
271 const struct iio_chan_spec *chan,
272 enum iio_event_type type,
273 enum iio_event_direction dir,
274 int state)
275{
276 struct iqs621_als_private *iqs621_als = iio_priv(indio_dev);
277 struct iqs62x_core *iqs62x = iqs621_als->iqs62x;
278 unsigned int val;
279 int ret;
280
281 mutex_lock(&iqs621_als->lock);
282
283 ret = regmap_read(iqs62x->regmap, iqs62x->dev_desc->als_flags, &val);
284 if (ret)
285 goto err_mutex;
286 iqs621_als->als_flags = val;
287
288 switch (chan->type) {
289 case IIO_LIGHT:
290 ret = regmap_update_bits(iqs62x->regmap, IQS620_GLBL_EVENT_MASK,
291 iqs62x->dev_desc->als_mask,
292 iqs621_als->range_en || state ? 0 :
293 0xFF);
294 if (!ret)
295 iqs621_als->light_en = state;
296 break;
297
298 case IIO_INTENSITY:
299 ret = regmap_update_bits(iqs62x->regmap, IQS620_GLBL_EVENT_MASK,
300 iqs62x->dev_desc->als_mask,
301 iqs621_als->light_en || state ? 0 :
302 0xFF);
303 if (!ret)
304 iqs621_als->range_en = state;
305 break;
306
307 case IIO_PROXIMITY:
308 ret = regmap_read(iqs62x->regmap, IQS622_IR_FLAGS, &val);
309 if (ret)
310 goto err_mutex;
311 iqs621_als->ir_flags = val;
312
313 ret = regmap_update_bits(iqs62x->regmap, IQS620_GLBL_EVENT_MASK,
314 iqs62x->dev_desc->ir_mask,
315 state ? 0 : 0xFF);
316 if (!ret)
317 iqs621_als->prox_en = state;
318 break;
319
320 default:
321 ret = -EINVAL;
322 }
323
324err_mutex:
325 mutex_unlock(&iqs621_als->lock);
326
327 return ret;
328}
329
330static int iqs621_als_read_event_value(struct iio_dev *indio_dev,
331 const struct iio_chan_spec *chan,
332 enum iio_event_type type,
333 enum iio_event_direction dir,
334 enum iio_event_info info,
335 int *val, int *val2)
336{
337 struct iqs621_als_private *iqs621_als = iio_priv(indio_dev);
338 int ret = IIO_VAL_INT;
339
340 mutex_lock(&iqs621_als->lock);
341
342 switch (dir) {
343 case IIO_EV_DIR_RISING:
344 *val = iqs621_als->thresh_light * 16;
345 break;
346
347 case IIO_EV_DIR_FALLING:
348 *val = iqs621_als->thresh_dark * 4;
349 break;
350
351 case IIO_EV_DIR_EITHER:
352 if (iqs621_als->ir_flags_mask == IQS622_IR_FLAGS_TOUCH)
353 *val = iqs621_als->thresh_prox * 4;
354 else
355 *val = iqs621_als->thresh_prox;
356 break;
357
358 default:
359 ret = -EINVAL;
360 }
361
362 mutex_unlock(&iqs621_als->lock);
363
364 return ret;
365}
366
367static int iqs621_als_write_event_value(struct iio_dev *indio_dev,
368 const struct iio_chan_spec *chan,
369 enum iio_event_type type,
370 enum iio_event_direction dir,
371 enum iio_event_info info,
372 int val, int val2)
373{
374 struct iqs621_als_private *iqs621_als = iio_priv(indio_dev);
375 struct iqs62x_core *iqs62x = iqs621_als->iqs62x;
376 unsigned int thresh_reg, thresh_val;
377 u8 ir_flags_mask, *thresh_cache;
378 int ret = -EINVAL;
379
380 mutex_lock(&iqs621_als->lock);
381
382 switch (dir) {
383 case IIO_EV_DIR_RISING:
384 thresh_reg = IQS621_ALS_THRESH_LIGHT;
385 thresh_val = val / 16;
386
387 thresh_cache = &iqs621_als->thresh_light;
388 ir_flags_mask = 0;
389 break;
390
391 case IIO_EV_DIR_FALLING:
392 thresh_reg = IQS621_ALS_THRESH_DARK;
393 thresh_val = val / 4;
394
395 thresh_cache = &iqs621_als->thresh_dark;
396 ir_flags_mask = 0;
397 break;
398
399 case IIO_EV_DIR_EITHER:
400
401
402
403
404
405
406
407
408
409
410
411
412
413 switch (val) {
414 case 0 ... 255:
415 thresh_reg = IQS622_IR_THRESH_PROX;
416 thresh_val = val;
417
418 ir_flags_mask = IQS622_IR_FLAGS_PROX;
419 break;
420
421 case 256 ... 1020:
422 thresh_reg = IQS622_IR_THRESH_TOUCH;
423 thresh_val = val / 4;
424
425 ir_flags_mask = IQS622_IR_FLAGS_TOUCH;
426 break;
427
428 default:
429 goto err_mutex;
430 }
431
432 thresh_cache = &iqs621_als->thresh_prox;
433 break;
434
435 default:
436 goto err_mutex;
437 }
438
439 if (thresh_val > 0xFF)
440 goto err_mutex;
441
442 ret = regmap_write(iqs62x->regmap, thresh_reg, thresh_val);
443 if (ret)
444 goto err_mutex;
445
446 *thresh_cache = thresh_val;
447 iqs621_als->ir_flags_mask = ir_flags_mask;
448
449err_mutex:
450 mutex_unlock(&iqs621_als->lock);
451
452 return ret;
453}
454
455static const struct iio_info iqs621_als_info = {
456 .read_raw = &iqs621_als_read_raw,
457 .read_event_config = iqs621_als_read_event_config,
458 .write_event_config = iqs621_als_write_event_config,
459 .read_event_value = iqs621_als_read_event_value,
460 .write_event_value = iqs621_als_write_event_value,
461};
462
463static const struct iio_event_spec iqs621_als_range_events[] = {
464 {
465 .type = IIO_EV_TYPE_CHANGE,
466 .dir = IIO_EV_DIR_EITHER,
467 .mask_separate = BIT(IIO_EV_INFO_ENABLE),
468 },
469};
470
471static const struct iio_event_spec iqs621_als_light_events[] = {
472 {
473 .type = IIO_EV_TYPE_THRESH,
474 .dir = IIO_EV_DIR_EITHER,
475 .mask_separate = BIT(IIO_EV_INFO_ENABLE),
476 },
477 {
478 .type = IIO_EV_TYPE_THRESH,
479 .dir = IIO_EV_DIR_RISING,
480 .mask_separate = BIT(IIO_EV_INFO_VALUE),
481 },
482 {
483 .type = IIO_EV_TYPE_THRESH,
484 .dir = IIO_EV_DIR_FALLING,
485 .mask_separate = BIT(IIO_EV_INFO_VALUE),
486 },
487};
488
489static const struct iio_chan_spec iqs621_als_channels[] = {
490 {
491 .type = IIO_INTENSITY,
492 .address = IQS621_ALS_FLAGS,
493 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
494 .event_spec = iqs621_als_range_events,
495 .num_event_specs = ARRAY_SIZE(iqs621_als_range_events),
496 },
497 {
498 .type = IIO_LIGHT,
499 .address = IQS621_ALS_UI_OUT,
500 .info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED),
501 .event_spec = iqs621_als_light_events,
502 .num_event_specs = ARRAY_SIZE(iqs621_als_light_events),
503 },
504};
505
506static const struct iio_event_spec iqs622_als_prox_events[] = {
507 {
508 .type = IIO_EV_TYPE_THRESH,
509 .dir = IIO_EV_DIR_EITHER,
510 .mask_separate = BIT(IIO_EV_INFO_ENABLE) |
511 BIT(IIO_EV_INFO_VALUE),
512 },
513};
514
515static const struct iio_chan_spec iqs622_als_channels[] = {
516 {
517 .type = IIO_INTENSITY,
518 .channel2 = IIO_MOD_LIGHT_BOTH,
519 .address = IQS622_ALS_FLAGS,
520 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
521 .event_spec = iqs621_als_range_events,
522 .num_event_specs = ARRAY_SIZE(iqs621_als_range_events),
523 .modified = true,
524 },
525 {
526 .type = IIO_INTENSITY,
527 .channel2 = IIO_MOD_LIGHT_IR,
528 .address = IQS622_IR_RANGE,
529 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
530 .modified = true,
531 },
532 {
533 .type = IIO_PROXIMITY,
534 .address = IQS622_IR_UI_OUT,
535 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
536 .event_spec = iqs622_als_prox_events,
537 .num_event_specs = ARRAY_SIZE(iqs622_als_prox_events),
538 },
539};
540
541static int iqs621_als_probe(struct platform_device *pdev)
542{
543 struct iqs62x_core *iqs62x = dev_get_drvdata(pdev->dev.parent);
544 struct iqs621_als_private *iqs621_als;
545 struct iio_dev *indio_dev;
546 unsigned int val;
547 int ret;
548
549 indio_dev = devm_iio_device_alloc(&pdev->dev, sizeof(*iqs621_als));
550 if (!indio_dev)
551 return -ENOMEM;
552
553 iqs621_als = iio_priv(indio_dev);
554 iqs621_als->iqs62x = iqs62x;
555 iqs621_als->indio_dev = indio_dev;
556
557 if (iqs62x->dev_desc->prod_num == IQS622_PROD_NUM) {
558 ret = regmap_read(iqs62x->regmap, IQS622_IR_THRESH_TOUCH,
559 &val);
560 if (ret)
561 return ret;
562 iqs621_als->thresh_prox = val;
563 iqs621_als->ir_flags_mask = IQS622_IR_FLAGS_TOUCH;
564
565 indio_dev->channels = iqs622_als_channels;
566 indio_dev->num_channels = ARRAY_SIZE(iqs622_als_channels);
567 } else {
568 ret = regmap_read(iqs62x->regmap, IQS621_ALS_THRESH_LIGHT,
569 &val);
570 if (ret)
571 return ret;
572 iqs621_als->thresh_light = val;
573
574 ret = regmap_read(iqs62x->regmap, IQS621_ALS_THRESH_DARK,
575 &val);
576 if (ret)
577 return ret;
578 iqs621_als->thresh_dark = val;
579
580 indio_dev->channels = iqs621_als_channels;
581 indio_dev->num_channels = ARRAY_SIZE(iqs621_als_channels);
582 }
583
584 indio_dev->modes = INDIO_DIRECT_MODE;
585 indio_dev->name = iqs62x->dev_desc->dev_name;
586 indio_dev->info = &iqs621_als_info;
587
588 mutex_init(&iqs621_als->lock);
589
590 iqs621_als->notifier.notifier_call = iqs621_als_notifier;
591 ret = blocking_notifier_chain_register(&iqs621_als->iqs62x->nh,
592 &iqs621_als->notifier);
593 if (ret) {
594 dev_err(&pdev->dev, "Failed to register notifier: %d\n", ret);
595 return ret;
596 }
597
598 ret = devm_add_action_or_reset(&pdev->dev,
599 iqs621_als_notifier_unregister,
600 iqs621_als);
601 if (ret)
602 return ret;
603
604 return devm_iio_device_register(&pdev->dev, indio_dev);
605}
606
607static struct platform_driver iqs621_als_platform_driver = {
608 .driver = {
609 .name = "iqs621-als",
610 },
611 .probe = iqs621_als_probe,
612};
613module_platform_driver(iqs621_als_platform_driver);
614
615MODULE_AUTHOR("Jeff LaBundy <jeff@labundy.com>");
616MODULE_DESCRIPTION("Azoteq IQS621/622 Ambient Light Sensors");
617MODULE_LICENSE("GPL");
618MODULE_ALIAS("platform:iqs621-als");
619
