1 // SPDX-License-Identifier: GPL-2.0+
3 * Azoteq IQS621/622 Ambient Light Sensors
5 * Copyright (C) 2019 Jeff LaBundy <jeff@labundy.com>
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>
19 #define IQS621_ALS_FLAGS_LIGHT BIT(7)
20 #define IQS621_ALS_FLAGS_RANGE GENMASK(3, 0)
22 #define IQS621_ALS_UI_OUT 0x17
24 #define IQS621_ALS_THRESH_DARK 0x80
25 #define IQS621_ALS_THRESH_LIGHT 0x81
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)
32 #define IQS622_IR_UI_OUT 0x17
34 #define IQS622_IR_THRESH_PROX 0x91
35 #define IQS622_IR_THRESH_TOUCH 0x92
37 struct iqs621_als_private {
38 struct iqs62x_core *iqs62x;
39 struct iio_dev *indio_dev;
40 struct notifier_block notifier;
53 static int iqs621_als_init(struct iqs621_als_private *iqs621_als)
55 struct iqs62x_core *iqs62x = iqs621_als->iqs62x;
56 unsigned int event_mask = 0;
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);
65 case IQS622_IR_FLAGS_PROX:
66 ret = regmap_write(iqs62x->regmap, IQS622_IR_THRESH_PROX,
67 iqs621_als->thresh_prox);
71 ret = regmap_write(iqs62x->regmap, IQS621_ALS_THRESH_LIGHT,
72 iqs621_als->thresh_light);
76 ret = regmap_write(iqs62x->regmap, IQS621_ALS_THRESH_DARK,
77 iqs621_als->thresh_dark);
83 if (iqs621_als->light_en || iqs621_als->range_en)
84 event_mask |= iqs62x->dev_desc->als_mask;
86 if (iqs621_als->prox_en)
87 event_mask |= iqs62x->dev_desc->ir_mask;
89 return regmap_update_bits(iqs62x->regmap, IQS620_GLBL_EVENT_MASK,
93 static int iqs621_als_notifier(struct notifier_block *notifier,
94 unsigned long event_flags, void *context)
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;
105 iqs621_als = container_of(notifier, struct iqs621_als_private,
107 indio_dev = iqs621_als->indio_dev;
108 timestamp = iio_get_time_ns(indio_dev);
110 mutex_lock(&iqs621_als->lock);
112 if (event_flags & BIT(IQS62X_EVENT_SYS_RESET)) {
113 ret = iqs621_als_init(iqs621_als);
115 dev_err(indio_dev->dev.parent,
116 "Failed to re-initialize device: %d\n", ret);
125 if (!iqs621_als->light_en && !iqs621_als->range_en &&
126 !iqs621_als->prox_en) {
132 light_new = event_data->als_flags & IQS621_ALS_FLAGS_LIGHT;
133 light_old = iqs621_als->als_flags & IQS621_ALS_FLAGS_LIGHT;
135 if (iqs621_als->light_en && light_new && !light_old)
136 iio_push_event(indio_dev,
137 IIO_UNMOD_EVENT_CODE(IIO_LIGHT, 0,
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,
148 /* IQS621 and IQS622 */
149 range_new = event_data->als_flags & IQS621_ALS_FLAGS_RANGE;
150 range_old = iqs621_als->als_flags & IQS621_ALS_FLAGS_RANGE;
152 if (iqs621_als->range_en && (range_new > range_old))
153 iio_push_event(indio_dev,
154 IIO_UNMOD_EVENT_CODE(IIO_INTENSITY, 0,
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,
166 prox_new = event_data->ir_flags & iqs621_als->ir_flags_mask;
167 prox_old = iqs621_als->ir_flags & iqs621_als->ir_flags_mask;
169 if (iqs621_als->prox_en && prox_new && !prox_old)
170 iio_push_event(indio_dev,
171 IIO_UNMOD_EVENT_CODE(IIO_PROXIMITY, 0,
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,
182 iqs621_als->als_flags = event_data->als_flags;
183 iqs621_als->ir_flags = event_data->ir_flags;
187 mutex_unlock(&iqs621_als->lock);
192 static void iqs621_als_notifier_unregister(void *context)
194 struct iqs621_als_private *iqs621_als = context;
195 struct iio_dev *indio_dev = iqs621_als->indio_dev;
198 ret = blocking_notifier_chain_unregister(&iqs621_als->iqs62x->nh,
199 &iqs621_als->notifier);
201 dev_err(indio_dev->dev.parent,
202 "Failed to unregister notifier: %d\n", ret);
205 static int iqs621_als_read_raw(struct iio_dev *indio_dev,
206 struct iio_chan_spec const *chan,
207 int *val, int *val2, long mask)
209 struct iqs621_als_private *iqs621_als = iio_priv(indio_dev);
210 struct iqs62x_core *iqs62x = iqs621_als->iqs62x;
214 switch (chan->type) {
216 ret = regmap_read(iqs62x->regmap, chan->address, val);
220 *val &= IQS621_ALS_FLAGS_RANGE;
225 ret = regmap_raw_read(iqs62x->regmap, chan->address, &val_buf,
230 *val = le16_to_cpu(val_buf);
238 static 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)
243 struct iqs621_als_private *iqs621_als = iio_priv(indio_dev);
246 mutex_lock(&iqs621_als->lock);
248 switch (chan->type) {
250 ret = iqs621_als->light_en;
254 ret = iqs621_als->range_en;
258 ret = iqs621_als->prox_en;
265 mutex_unlock(&iqs621_als->lock);
270 static 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,
276 struct iqs621_als_private *iqs621_als = iio_priv(indio_dev);
277 struct iqs62x_core *iqs62x = iqs621_als->iqs62x;
281 mutex_lock(&iqs621_als->lock);
283 ret = regmap_read(iqs62x->regmap, iqs62x->dev_desc->als_flags, &val);
286 iqs621_als->als_flags = val;
288 switch (chan->type) {
290 ret = regmap_update_bits(iqs62x->regmap, IQS620_GLBL_EVENT_MASK,
291 iqs62x->dev_desc->als_mask,
292 iqs621_als->range_en || state ? 0 :
295 iqs621_als->light_en = state;
299 ret = regmap_update_bits(iqs62x->regmap, IQS620_GLBL_EVENT_MASK,
300 iqs62x->dev_desc->als_mask,
301 iqs621_als->light_en || state ? 0 :
304 iqs621_als->range_en = state;
308 ret = regmap_read(iqs62x->regmap, IQS622_IR_FLAGS, &val);
311 iqs621_als->ir_flags = val;
313 ret = regmap_update_bits(iqs62x->regmap, IQS620_GLBL_EVENT_MASK,
314 iqs62x->dev_desc->ir_mask,
317 iqs621_als->prox_en = state;
325 mutex_unlock(&iqs621_als->lock);
330 static 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,
337 struct iqs621_als_private *iqs621_als = iio_priv(indio_dev);
338 int ret = IIO_VAL_INT;
340 mutex_lock(&iqs621_als->lock);
343 case IIO_EV_DIR_RISING:
344 *val = iqs621_als->thresh_light * 16;
347 case IIO_EV_DIR_FALLING:
348 *val = iqs621_als->thresh_dark * 4;
351 case IIO_EV_DIR_EITHER:
352 if (iqs621_als->ir_flags_mask == IQS622_IR_FLAGS_TOUCH)
353 *val = iqs621_als->thresh_prox * 4;
355 *val = iqs621_als->thresh_prox;
362 mutex_unlock(&iqs621_als->lock);
367 static 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,
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;
380 mutex_lock(&iqs621_als->lock);
383 case IIO_EV_DIR_RISING:
384 thresh_reg = IQS621_ALS_THRESH_LIGHT;
385 thresh_val = val / 16;
387 thresh_cache = &iqs621_als->thresh_light;
391 case IIO_EV_DIR_FALLING:
392 thresh_reg = IQS621_ALS_THRESH_DARK;
393 thresh_val = val / 4;
395 thresh_cache = &iqs621_als->thresh_dark;
399 case IIO_EV_DIR_EITHER:
401 * The IQS622 supports two detection thresholds, both measured
402 * in the same arbitrary units reported by read_raw: proximity
403 * (0 through 255 in steps of 1), and touch (0 through 1020 in
406 * Based on the single detection threshold chosen by the user,
407 * select the hardware threshold that gives the best trade-off
408 * between range and resolution.
410 * By default, the close-range (but coarse) touch threshold is
411 * chosen during probe.
415 thresh_reg = IQS622_IR_THRESH_PROX;
418 ir_flags_mask = IQS622_IR_FLAGS_PROX;
422 thresh_reg = IQS622_IR_THRESH_TOUCH;
423 thresh_val = val / 4;
425 ir_flags_mask = IQS622_IR_FLAGS_TOUCH;
432 thresh_cache = &iqs621_als->thresh_prox;
439 if (thresh_val > 0xFF)
442 ret = regmap_write(iqs62x->regmap, thresh_reg, thresh_val);
446 *thresh_cache = thresh_val;
447 iqs621_als->ir_flags_mask = ir_flags_mask;
450 mutex_unlock(&iqs621_als->lock);
455 static 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,
463 static const struct iio_event_spec iqs621_als_range_events[] = {
465 .type = IIO_EV_TYPE_CHANGE,
466 .dir = IIO_EV_DIR_EITHER,
467 .mask_separate = BIT(IIO_EV_INFO_ENABLE),
471 static const struct iio_event_spec iqs621_als_light_events[] = {
473 .type = IIO_EV_TYPE_THRESH,
474 .dir = IIO_EV_DIR_EITHER,
475 .mask_separate = BIT(IIO_EV_INFO_ENABLE),
478 .type = IIO_EV_TYPE_THRESH,
479 .dir = IIO_EV_DIR_RISING,
480 .mask_separate = BIT(IIO_EV_INFO_VALUE),
483 .type = IIO_EV_TYPE_THRESH,
484 .dir = IIO_EV_DIR_FALLING,
485 .mask_separate = BIT(IIO_EV_INFO_VALUE),
489 static const struct iio_chan_spec iqs621_als_channels[] = {
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),
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),
506 static const struct iio_event_spec iqs622_als_prox_events[] = {
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),
515 static const struct iio_chan_spec iqs622_als_channels[] = {
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),
526 .type = IIO_INTENSITY,
527 .channel2 = IIO_MOD_LIGHT_IR,
528 .address = IQS622_IR_RANGE,
529 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
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),
541 static int iqs621_als_probe(struct platform_device *pdev)
543 struct iqs62x_core *iqs62x = dev_get_drvdata(pdev->dev.parent);
544 struct iqs621_als_private *iqs621_als;
545 struct iio_dev *indio_dev;
549 indio_dev = devm_iio_device_alloc(&pdev->dev, sizeof(*iqs621_als));
553 iqs621_als = iio_priv(indio_dev);
554 iqs621_als->iqs62x = iqs62x;
555 iqs621_als->indio_dev = indio_dev;
557 if (iqs62x->dev_desc->prod_num == IQS622_PROD_NUM) {
558 ret = regmap_read(iqs62x->regmap, IQS622_IR_THRESH_TOUCH,
562 iqs621_als->thresh_prox = val;
563 iqs621_als->ir_flags_mask = IQS622_IR_FLAGS_TOUCH;
565 indio_dev->channels = iqs622_als_channels;
566 indio_dev->num_channels = ARRAY_SIZE(iqs622_als_channels);
568 ret = regmap_read(iqs62x->regmap, IQS621_ALS_THRESH_LIGHT,
572 iqs621_als->thresh_light = val;
574 ret = regmap_read(iqs62x->regmap, IQS621_ALS_THRESH_DARK,
578 iqs621_als->thresh_dark = val;
580 indio_dev->channels = iqs621_als_channels;
581 indio_dev->num_channels = ARRAY_SIZE(iqs621_als_channels);
584 indio_dev->modes = INDIO_DIRECT_MODE;
585 indio_dev->name = iqs62x->dev_desc->dev_name;
586 indio_dev->info = &iqs621_als_info;
588 mutex_init(&iqs621_als->lock);
590 iqs621_als->notifier.notifier_call = iqs621_als_notifier;
591 ret = blocking_notifier_chain_register(&iqs621_als->iqs62x->nh,
592 &iqs621_als->notifier);
594 dev_err(&pdev->dev, "Failed to register notifier: %d\n", ret);
598 ret = devm_add_action_or_reset(&pdev->dev,
599 iqs621_als_notifier_unregister,
604 return devm_iio_device_register(&pdev->dev, indio_dev);
607 static struct platform_driver iqs621_als_platform_driver = {
609 .name = "iqs621-als",
611 .probe = iqs621_als_probe,
613 module_platform_driver(iqs621_als_platform_driver);
615 MODULE_AUTHOR("Jeff LaBundy <jeff@labundy.com>");
616 MODULE_DESCRIPTION("Azoteq IQS621/622 Ambient Light Sensors");
617 MODULE_LICENSE("GPL");
618 MODULE_ALIAS("platform:iqs621-als");