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14#include <linux/module.h>
15#include <linux/i2c.h>
16#include <linux/err.h>
17#include <linux/mutex.h>
18#include <linux/delay.h>
19#include <linux/slab.h>
20#include <linux/regmap.h>
21#include <linux/iio/iio.h>
22#include <linux/iio/sysfs.h>
23#include <linux/pm_runtime.h>
24
25#define ISL29028_CONV_TIME_MS 100
26
27#define ISL29028_REG_CONFIGURE 0x01
28
29#define ISL29028_CONF_ALS_IR_MODE_ALS 0
30#define ISL29028_CONF_ALS_IR_MODE_IR BIT(0)
31#define ISL29028_CONF_ALS_IR_MODE_MASK BIT(0)
32
33#define ISL29028_CONF_ALS_RANGE_LOW_LUX 0
34#define ISL29028_CONF_ALS_RANGE_HIGH_LUX BIT(1)
35#define ISL29028_CONF_ALS_RANGE_MASK BIT(1)
36
37#define ISL29028_CONF_ALS_DIS 0
38#define ISL29028_CONF_ALS_EN BIT(2)
39#define ISL29028_CONF_ALS_EN_MASK BIT(2)
40
41#define ISL29028_CONF_PROX_SLP_SH 4
42#define ISL29028_CONF_PROX_SLP_MASK (7 << ISL29028_CONF_PROX_SLP_SH)
43
44#define ISL29028_CONF_PROX_EN BIT(7)
45#define ISL29028_CONF_PROX_EN_MASK BIT(7)
46
47#define ISL29028_REG_INTERRUPT 0x02
48
49#define ISL29028_REG_PROX_DATA 0x08
50#define ISL29028_REG_ALSIR_L 0x09
51#define ISL29028_REG_ALSIR_U 0x0A
52
53#define ISL29028_REG_TEST1_MODE 0x0E
54#define ISL29028_REG_TEST2_MODE 0x0F
55
56#define ISL29028_NUM_REGS (ISL29028_REG_TEST2_MODE + 1)
57
58#define ISL29028_POWER_OFF_DELAY_MS 2000
59
60struct isl29028_prox_data {
61 int sampling_int;
62 int sampling_fract;
63 int sleep_time;
64};
65
66static const struct isl29028_prox_data isl29028_prox_data[] = {
67 { 1, 250000, 800 },
68 { 2, 500000, 400 },
69 { 5, 0, 200 },
70 { 10, 0, 100 },
71 { 13, 300000, 75 },
72 { 20, 0, 50 },
73 { 80, 0, 13 },
74
75
76
77 { 100, 0, 0 }
78};
79
80enum isl29028_als_ir_mode {
81 ISL29028_MODE_NONE = 0,
82 ISL29028_MODE_ALS,
83 ISL29028_MODE_IR,
84};
85
86struct isl29028_chip {
87 struct mutex lock;
88 struct regmap *regmap;
89 int prox_sampling_int;
90 int prox_sampling_frac;
91 bool enable_prox;
92 int lux_scale;
93 enum isl29028_als_ir_mode als_ir_mode;
94};
95
96static int isl29028_find_prox_sleep_index(int sampling_int, int sampling_fract)
97{
98 int i;
99
100 for (i = 0; i < ARRAY_SIZE(isl29028_prox_data); ++i) {
101 if (isl29028_prox_data[i].sampling_int == sampling_int &&
102 isl29028_prox_data[i].sampling_fract == sampling_fract)
103 return i;
104 }
105
106 return -EINVAL;
107}
108
109static int isl29028_set_proxim_sampling(struct isl29028_chip *chip,
110 int sampling_int, int sampling_fract)
111{
112 struct device *dev = regmap_get_device(chip->regmap);
113 int sleep_index, ret;
114
115 sleep_index = isl29028_find_prox_sleep_index(sampling_int,
116 sampling_fract);
117 if (sleep_index < 0)
118 return sleep_index;
119
120 ret = regmap_update_bits(chip->regmap, ISL29028_REG_CONFIGURE,
121 ISL29028_CONF_PROX_SLP_MASK,
122 sleep_index << ISL29028_CONF_PROX_SLP_SH);
123
124 if (ret < 0) {
125 dev_err(dev, "%s(): Error %d setting the proximity sampling\n",
126 __func__, ret);
127 return ret;
128 }
129
130 chip->prox_sampling_int = sampling_int;
131 chip->prox_sampling_frac = sampling_fract;
132
133 return ret;
134}
135
136static int isl29028_enable_proximity(struct isl29028_chip *chip)
137{
138 int prox_index, ret;
139
140 ret = isl29028_set_proxim_sampling(chip, chip->prox_sampling_int,
141 chip->prox_sampling_frac);
142 if (ret < 0)
143 return ret;
144
145 ret = regmap_update_bits(chip->regmap, ISL29028_REG_CONFIGURE,
146 ISL29028_CONF_PROX_EN_MASK,
147 ISL29028_CONF_PROX_EN);
148 if (ret < 0)
149 return ret;
150
151
152 prox_index = isl29028_find_prox_sleep_index(chip->prox_sampling_int,
153 chip->prox_sampling_frac);
154 if (prox_index < 0)
155 return prox_index;
156
157 msleep(isl29028_prox_data[prox_index].sleep_time);
158
159 return 0;
160}
161
162static int isl29028_set_als_scale(struct isl29028_chip *chip, int lux_scale)
163{
164 struct device *dev = regmap_get_device(chip->regmap);
165 int val = (lux_scale == 2000) ? ISL29028_CONF_ALS_RANGE_HIGH_LUX :
166 ISL29028_CONF_ALS_RANGE_LOW_LUX;
167 int ret;
168
169 ret = regmap_update_bits(chip->regmap, ISL29028_REG_CONFIGURE,
170 ISL29028_CONF_ALS_RANGE_MASK, val);
171 if (ret < 0) {
172 dev_err(dev, "%s(): Error %d setting the ALS scale\n", __func__,
173 ret);
174 return ret;
175 }
176
177 chip->lux_scale = lux_scale;
178
179 return ret;
180}
181
182static int isl29028_set_als_ir_mode(struct isl29028_chip *chip,
183 enum isl29028_als_ir_mode mode)
184{
185 int ret;
186
187 if (chip->als_ir_mode == mode)
188 return 0;
189
190 ret = isl29028_set_als_scale(chip, chip->lux_scale);
191 if (ret < 0)
192 return ret;
193
194 switch (mode) {
195 case ISL29028_MODE_ALS:
196 ret = regmap_update_bits(chip->regmap, ISL29028_REG_CONFIGURE,
197 ISL29028_CONF_ALS_IR_MODE_MASK,
198 ISL29028_CONF_ALS_IR_MODE_ALS);
199 if (ret < 0)
200 return ret;
201
202 ret = regmap_update_bits(chip->regmap, ISL29028_REG_CONFIGURE,
203 ISL29028_CONF_ALS_RANGE_MASK,
204 ISL29028_CONF_ALS_RANGE_HIGH_LUX);
205 break;
206 case ISL29028_MODE_IR:
207 ret = regmap_update_bits(chip->regmap, ISL29028_REG_CONFIGURE,
208 ISL29028_CONF_ALS_IR_MODE_MASK,
209 ISL29028_CONF_ALS_IR_MODE_IR);
210 break;
211 case ISL29028_MODE_NONE:
212 return regmap_update_bits(chip->regmap, ISL29028_REG_CONFIGURE,
213 ISL29028_CONF_ALS_EN_MASK,
214 ISL29028_CONF_ALS_DIS);
215 }
216
217 if (ret < 0)
218 return ret;
219
220
221 ret = regmap_update_bits(chip->regmap, ISL29028_REG_CONFIGURE,
222 ISL29028_CONF_ALS_EN_MASK,
223 ISL29028_CONF_ALS_EN);
224 if (ret < 0)
225 return ret;
226
227
228 msleep(ISL29028_CONV_TIME_MS);
229
230 chip->als_ir_mode = mode;
231
232 return 0;
233}
234
235static int isl29028_read_als_ir(struct isl29028_chip *chip, int *als_ir)
236{
237 struct device *dev = regmap_get_device(chip->regmap);
238 unsigned int lsb;
239 unsigned int msb;
240 int ret;
241
242 ret = regmap_read(chip->regmap, ISL29028_REG_ALSIR_L, &lsb);
243 if (ret < 0) {
244 dev_err(dev,
245 "%s(): Error %d reading register ALSIR_L\n",
246 __func__, ret);
247 return ret;
248 }
249
250 ret = regmap_read(chip->regmap, ISL29028_REG_ALSIR_U, &msb);
251 if (ret < 0) {
252 dev_err(dev,
253 "%s(): Error %d reading register ALSIR_U\n",
254 __func__, ret);
255 return ret;
256 }
257
258 *als_ir = ((msb & 0xF) << 8) | (lsb & 0xFF);
259
260 return 0;
261}
262
263static int isl29028_read_proxim(struct isl29028_chip *chip, int *prox)
264{
265 struct device *dev = regmap_get_device(chip->regmap);
266 unsigned int data;
267 int ret;
268
269 if (!chip->enable_prox) {
270 ret = isl29028_enable_proximity(chip);
271 if (ret < 0)
272 return ret;
273
274 chip->enable_prox = true;
275 }
276
277 ret = regmap_read(chip->regmap, ISL29028_REG_PROX_DATA, &data);
278 if (ret < 0) {
279 dev_err(dev, "%s(): Error %d reading register PROX_DATA\n",
280 __func__, ret);
281 return ret;
282 }
283
284 *prox = data;
285
286 return 0;
287}
288
289static int isl29028_als_get(struct isl29028_chip *chip, int *als_data)
290{
291 struct device *dev = regmap_get_device(chip->regmap);
292 int ret;
293 int als_ir_data;
294
295 ret = isl29028_set_als_ir_mode(chip, ISL29028_MODE_ALS);
296 if (ret < 0) {
297 dev_err(dev, "%s(): Error %d enabling ALS mode\n", __func__,
298 ret);
299 return ret;
300 }
301
302 ret = isl29028_read_als_ir(chip, &als_ir_data);
303 if (ret < 0)
304 return ret;
305
306
307
308
309
310
311 if (chip->lux_scale == 125)
312 als_ir_data = (als_ir_data * 31) / 1000;
313 else
314 als_ir_data = (als_ir_data * 49) / 100;
315
316 *als_data = als_ir_data;
317
318 return 0;
319}
320
321static int isl29028_ir_get(struct isl29028_chip *chip, int *ir_data)
322{
323 struct device *dev = regmap_get_device(chip->regmap);
324 int ret;
325
326 ret = isl29028_set_als_ir_mode(chip, ISL29028_MODE_IR);
327 if (ret < 0) {
328 dev_err(dev, "%s(): Error %d enabling IR mode\n", __func__,
329 ret);
330 return ret;
331 }
332
333 return isl29028_read_als_ir(chip, ir_data);
334}
335
336static int isl29028_set_pm_runtime_busy(struct isl29028_chip *chip, bool on)
337{
338 struct device *dev = regmap_get_device(chip->regmap);
339 int ret;
340
341 if (on) {
342 ret = pm_runtime_resume_and_get(dev);
343 } else {
344 pm_runtime_mark_last_busy(dev);
345 ret = pm_runtime_put_autosuspend(dev);
346 }
347
348 return ret;
349}
350
351
352static int isl29028_write_raw(struct iio_dev *indio_dev,
353 struct iio_chan_spec const *chan,
354 int val, int val2, long mask)
355{
356 struct isl29028_chip *chip = iio_priv(indio_dev);
357 struct device *dev = regmap_get_device(chip->regmap);
358 int ret;
359
360 ret = isl29028_set_pm_runtime_busy(chip, true);
361 if (ret < 0)
362 return ret;
363
364 mutex_lock(&chip->lock);
365
366 ret = -EINVAL;
367 switch (chan->type) {
368 case IIO_PROXIMITY:
369 if (mask != IIO_CHAN_INFO_SAMP_FREQ) {
370 dev_err(dev,
371 "%s(): proximity: Mask value 0x%08lx is not supported\n",
372 __func__, mask);
373 break;
374 }
375
376 if (val < 1 || val > 100) {
377 dev_err(dev,
378 "%s(): proximity: Sampling frequency %d is not in the range [1:100]\n",
379 __func__, val);
380 break;
381 }
382
383 ret = isl29028_set_proxim_sampling(chip, val, val2);
384 break;
385 case IIO_LIGHT:
386 if (mask != IIO_CHAN_INFO_SCALE) {
387 dev_err(dev,
388 "%s(): light: Mask value 0x%08lx is not supported\n",
389 __func__, mask);
390 break;
391 }
392
393 if (val != 125 && val != 2000) {
394 dev_err(dev,
395 "%s(): light: Lux scale %d is not in the set {125, 2000}\n",
396 __func__, val);
397 break;
398 }
399
400 ret = isl29028_set_als_scale(chip, val);
401 break;
402 default:
403 dev_err(dev, "%s(): Unsupported channel type %x\n",
404 __func__, chan->type);
405 break;
406 }
407
408 mutex_unlock(&chip->lock);
409
410 if (ret < 0)
411 return ret;
412
413 ret = isl29028_set_pm_runtime_busy(chip, false);
414 if (ret < 0)
415 return ret;
416
417 return ret;
418}
419
420static int isl29028_read_raw(struct iio_dev *indio_dev,
421 struct iio_chan_spec const *chan,
422 int *val, int *val2, long mask)
423{
424 struct isl29028_chip *chip = iio_priv(indio_dev);
425 struct device *dev = regmap_get_device(chip->regmap);
426 int ret, pm_ret;
427
428 ret = isl29028_set_pm_runtime_busy(chip, true);
429 if (ret < 0)
430 return ret;
431
432 mutex_lock(&chip->lock);
433
434 ret = -EINVAL;
435 switch (mask) {
436 case IIO_CHAN_INFO_RAW:
437 case IIO_CHAN_INFO_PROCESSED:
438 switch (chan->type) {
439 case IIO_LIGHT:
440 ret = isl29028_als_get(chip, val);
441 break;
442 case IIO_INTENSITY:
443 ret = isl29028_ir_get(chip, val);
444 break;
445 case IIO_PROXIMITY:
446 ret = isl29028_read_proxim(chip, val);
447 break;
448 default:
449 break;
450 }
451
452 if (ret < 0)
453 break;
454
455 ret = IIO_VAL_INT;
456 break;
457 case IIO_CHAN_INFO_SAMP_FREQ:
458 if (chan->type != IIO_PROXIMITY)
459 break;
460
461 *val = chip->prox_sampling_int;
462 *val2 = chip->prox_sampling_frac;
463 ret = IIO_VAL_INT;
464 break;
465 case IIO_CHAN_INFO_SCALE:
466 if (chan->type != IIO_LIGHT)
467 break;
468 *val = chip->lux_scale;
469 ret = IIO_VAL_INT;
470 break;
471 default:
472 dev_err(dev, "%s(): mask value 0x%08lx is not supported\n",
473 __func__, mask);
474 break;
475 }
476
477 mutex_unlock(&chip->lock);
478
479 if (ret < 0)
480 return ret;
481
482
483
484
485
486
487 pm_ret = isl29028_set_pm_runtime_busy(chip, false);
488 if (pm_ret < 0)
489 return pm_ret;
490
491 return ret;
492}
493
494static IIO_CONST_ATTR(in_proximity_sampling_frequency_available,
495 "1.25 2.5 5 10 13.3 20 80 100");
496static IIO_CONST_ATTR(in_illuminance_scale_available, "125 2000");
497
498#define ISL29028_CONST_ATTR(name) (&iio_const_attr_##name.dev_attr.attr)
499static struct attribute *isl29028_attributes[] = {
500 ISL29028_CONST_ATTR(in_proximity_sampling_frequency_available),
501 ISL29028_CONST_ATTR(in_illuminance_scale_available),
502 NULL,
503};
504
505static const struct attribute_group isl29108_group = {
506 .attrs = isl29028_attributes,
507};
508
509static const struct iio_chan_spec isl29028_channels[] = {
510 {
511 .type = IIO_LIGHT,
512 .info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED) |
513 BIT(IIO_CHAN_INFO_SCALE),
514 }, {
515 .type = IIO_INTENSITY,
516 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
517 }, {
518 .type = IIO_PROXIMITY,
519 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
520 BIT(IIO_CHAN_INFO_SAMP_FREQ),
521 }
522};
523
524static const struct iio_info isl29028_info = {
525 .attrs = &isl29108_group,
526 .read_raw = isl29028_read_raw,
527 .write_raw = isl29028_write_raw,
528};
529
530static int isl29028_clear_configure_reg(struct isl29028_chip *chip)
531{
532 struct device *dev = regmap_get_device(chip->regmap);
533 int ret;
534
535 ret = regmap_write(chip->regmap, ISL29028_REG_CONFIGURE, 0x0);
536 if (ret < 0)
537 dev_err(dev, "%s(): Error %d clearing the CONFIGURE register\n",
538 __func__, ret);
539
540 chip->als_ir_mode = ISL29028_MODE_NONE;
541 chip->enable_prox = false;
542
543 return ret;
544}
545
546static bool isl29028_is_volatile_reg(struct device *dev, unsigned int reg)
547{
548 switch (reg) {
549 case ISL29028_REG_INTERRUPT:
550 case ISL29028_REG_PROX_DATA:
551 case ISL29028_REG_ALSIR_L:
552 case ISL29028_REG_ALSIR_U:
553 return true;
554 default:
555 return false;
556 }
557}
558
559static const struct regmap_config isl29028_regmap_config = {
560 .reg_bits = 8,
561 .val_bits = 8,
562 .volatile_reg = isl29028_is_volatile_reg,
563 .max_register = ISL29028_NUM_REGS - 1,
564 .num_reg_defaults_raw = ISL29028_NUM_REGS,
565 .cache_type = REGCACHE_RBTREE,
566};
567
568static int isl29028_probe(struct i2c_client *client,
569 const struct i2c_device_id *id)
570{
571 struct isl29028_chip *chip;
572 struct iio_dev *indio_dev;
573 int ret;
574
575 indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*chip));
576 if (!indio_dev)
577 return -ENOMEM;
578
579 chip = iio_priv(indio_dev);
580
581 i2c_set_clientdata(client, indio_dev);
582 mutex_init(&chip->lock);
583
584 chip->regmap = devm_regmap_init_i2c(client, &isl29028_regmap_config);
585 if (IS_ERR(chip->regmap)) {
586 ret = PTR_ERR(chip->regmap);
587 dev_err(&client->dev, "%s: Error %d initializing regmap\n",
588 __func__, ret);
589 return ret;
590 }
591
592 chip->enable_prox = false;
593 chip->prox_sampling_int = 20;
594 chip->prox_sampling_frac = 0;
595 chip->lux_scale = 2000;
596
597 ret = regmap_write(chip->regmap, ISL29028_REG_TEST1_MODE, 0x0);
598 if (ret < 0) {
599 dev_err(&client->dev,
600 "%s(): Error %d writing to TEST1_MODE register\n",
601 __func__, ret);
602 return ret;
603 }
604
605 ret = regmap_write(chip->regmap, ISL29028_REG_TEST2_MODE, 0x0);
606 if (ret < 0) {
607 dev_err(&client->dev,
608 "%s(): Error %d writing to TEST2_MODE register\n",
609 __func__, ret);
610 return ret;
611 }
612
613 ret = isl29028_clear_configure_reg(chip);
614 if (ret < 0)
615 return ret;
616
617 indio_dev->info = &isl29028_info;
618 indio_dev->channels = isl29028_channels;
619 indio_dev->num_channels = ARRAY_SIZE(isl29028_channels);
620 indio_dev->name = id->name;
621 indio_dev->modes = INDIO_DIRECT_MODE;
622
623 pm_runtime_enable(&client->dev);
624 pm_runtime_set_autosuspend_delay(&client->dev,
625 ISL29028_POWER_OFF_DELAY_MS);
626 pm_runtime_use_autosuspend(&client->dev);
627
628 ret = devm_iio_device_register(indio_dev->dev.parent, indio_dev);
629 if (ret < 0) {
630 dev_err(&client->dev,
631 "%s(): iio registration failed with error %d\n",
632 __func__, ret);
633 return ret;
634 }
635
636 return 0;
637}
638
639static int isl29028_remove(struct i2c_client *client)
640{
641 struct iio_dev *indio_dev = i2c_get_clientdata(client);
642 struct isl29028_chip *chip = iio_priv(indio_dev);
643
644 iio_device_unregister(indio_dev);
645
646 pm_runtime_disable(&client->dev);
647 pm_runtime_set_suspended(&client->dev);
648
649 return isl29028_clear_configure_reg(chip);
650}
651
652static int __maybe_unused isl29028_suspend(struct device *dev)
653{
654 struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
655 struct isl29028_chip *chip = iio_priv(indio_dev);
656 int ret;
657
658 mutex_lock(&chip->lock);
659
660 ret = isl29028_clear_configure_reg(chip);
661
662 mutex_unlock(&chip->lock);
663
664 return ret;
665}
666
667static int __maybe_unused isl29028_resume(struct device *dev)
668{
669
670
671
672
673
674 return 0;
675}
676
677static const struct dev_pm_ops isl29028_pm_ops = {
678 SET_SYSTEM_SLEEP_PM_OPS(pm_runtime_force_suspend,
679 pm_runtime_force_resume)
680 SET_RUNTIME_PM_OPS(isl29028_suspend, isl29028_resume, NULL)
681};
682
683static const struct i2c_device_id isl29028_id[] = {
684 {"isl29028", 0},
685 {"isl29030", 0},
686 {}
687};
688MODULE_DEVICE_TABLE(i2c, isl29028_id);
689
690static const struct of_device_id isl29028_of_match[] = {
691 { .compatible = "isl,isl29028", },
692 { .compatible = "isil,isl29028", },
693 { .compatible = "isil,isl29030", },
694 { },
695};
696MODULE_DEVICE_TABLE(of, isl29028_of_match);
697
698static struct i2c_driver isl29028_driver = {
699 .driver = {
700 .name = "isl29028",
701 .pm = &isl29028_pm_ops,
702 .of_match_table = isl29028_of_match,
703 },
704 .probe = isl29028_probe,
705 .remove = isl29028_remove,
706 .id_table = isl29028_id,
707};
708
709module_i2c_driver(isl29028_driver);
710
711MODULE_DESCRIPTION("ISL29028 Ambient Light and Proximity Sensor driver");
712MODULE_LICENSE("GPL v2");
713MODULE_AUTHOR("Laxman Dewangan <ldewangan@nvidia.com>");
714
