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1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Sensortek STK3310/STK3311 Ambient Light and Proximity Sensor
4 *
5 * Copyright (c) 2015, Intel Corporation.
6 *
7 * IIO driver for STK3310/STK3311. 7-bit I2C address: 0x48.
8 */
9
10#include <linux/i2c.h>
11#include <linux/interrupt.h>
12#include <linux/kernel.h>
13#include <linux/module.h>
14#include <linux/mod_devicetable.h>
15#include <linux/regmap.h>
16#include <linux/iio/events.h>
17#include <linux/iio/iio.h>
18#include <linux/iio/sysfs.h>
19
20#define STK3310_REG_STATE 0x00
21#define STK3310_REG_PSCTRL 0x01
22#define STK3310_REG_ALSCTRL 0x02
23#define STK3310_REG_INT 0x04
24#define STK3310_REG_THDH_PS 0x06
25#define STK3310_REG_THDL_PS 0x08
26#define STK3310_REG_FLAG 0x10
27#define STK3310_REG_PS_DATA_MSB 0x11
28#define STK3310_REG_PS_DATA_LSB 0x12
29#define STK3310_REG_ALS_DATA_MSB 0x13
30#define STK3310_REG_ALS_DATA_LSB 0x14
31#define STK3310_REG_ID 0x3E
32#define STK3310_MAX_REG 0x80
33
34#define STK3310_STATE_EN_PS BIT(0)
35#define STK3310_STATE_EN_ALS BIT(1)
36#define STK3310_STATE_STANDBY 0x00
37
38#define STK3013_CHIP_ID_VAL 0x31
39#define STK3310_CHIP_ID_VAL 0x13
40#define STK3311_CHIP_ID_VAL 0x1D
41#define STK3311A_CHIP_ID_VAL 0x15
42#define STK3311S34_CHIP_ID_VAL 0x1E
43#define STK3311X_CHIP_ID_VAL 0x12
44#define STK3335_CHIP_ID_VAL 0x51
45#define STK3310_PSINT_EN 0x01
46#define STK3310_PS_MAX_VAL 0xFFFF
47
48#define STK3310_DRIVER_NAME "stk3310"
49#define STK3310_REGMAP_NAME "stk3310_regmap"
50#define STK3310_EVENT "stk3310_event"
51
52#define STK3310_SCALE_AVAILABLE "6.4 1.6 0.4 0.1"
53
54#define STK3310_IT_AVAILABLE \
55 "0.000185 0.000370 0.000741 0.001480 0.002960 0.005920 0.011840 " \
56 "0.023680 0.047360 0.094720 0.189440 0.378880 0.757760 1.515520 " \
57 "3.031040 6.062080"
58
59#define STK3310_REGFIELD(name) \
60 do { \
61 data->reg_##name = \
62 devm_regmap_field_alloc(&client->dev, regmap, \
63 stk3310_reg_field_##name); \
64 if (IS_ERR(data->reg_##name)) { \
65 dev_err(&client->dev, "reg field alloc failed.\n"); \
66 return PTR_ERR(data->reg_##name); \
67 } \
68 } while (0)
69
70static const struct reg_field stk3310_reg_field_state =
71 REG_FIELD(STK3310_REG_STATE, 0, 2);
72static const struct reg_field stk3310_reg_field_als_gain =
73 REG_FIELD(STK3310_REG_ALSCTRL, 4, 5);
74static const struct reg_field stk3310_reg_field_ps_gain =
75 REG_FIELD(STK3310_REG_PSCTRL, 4, 5);
76static const struct reg_field stk3310_reg_field_als_it =
77 REG_FIELD(STK3310_REG_ALSCTRL, 0, 3);
78static const struct reg_field stk3310_reg_field_ps_it =
79 REG_FIELD(STK3310_REG_PSCTRL, 0, 3);
80static const struct reg_field stk3310_reg_field_int_ps =
81 REG_FIELD(STK3310_REG_INT, 0, 2);
82static const struct reg_field stk3310_reg_field_flag_psint =
83 REG_FIELD(STK3310_REG_FLAG, 4, 4);
84static const struct reg_field stk3310_reg_field_flag_nf =
85 REG_FIELD(STK3310_REG_FLAG, 0, 0);
86
87static const u8 stk3310_chip_ids[] = {
88 STK3013_CHIP_ID_VAL,
89 STK3310_CHIP_ID_VAL,
90 STK3311A_CHIP_ID_VAL,
91 STK3311S34_CHIP_ID_VAL,
92 STK3311X_CHIP_ID_VAL,
93 STK3311_CHIP_ID_VAL,
94 STK3335_CHIP_ID_VAL,
95};
96
97/* Estimate maximum proximity values with regard to measurement scale. */
98static const int stk3310_ps_max[4] = {
99 STK3310_PS_MAX_VAL / 640,
100 STK3310_PS_MAX_VAL / 160,
101 STK3310_PS_MAX_VAL / 40,
102 STK3310_PS_MAX_VAL / 10
103};
104
105static const int stk3310_scale_table[][2] = {
106 {6, 400000}, {1, 600000}, {0, 400000}, {0, 100000}
107};
108
109/* Integration time in seconds, microseconds */
110static const int stk3310_it_table[][2] = {
111 {0, 185}, {0, 370}, {0, 741}, {0, 1480},
112 {0, 2960}, {0, 5920}, {0, 11840}, {0, 23680},
113 {0, 47360}, {0, 94720}, {0, 189440}, {0, 378880},
114 {0, 757760}, {1, 515520}, {3, 31040}, {6, 62080},
115};
116
117struct stk3310_data {
118 struct i2c_client *client;
119 struct mutex lock;
120 bool als_enabled;
121 bool ps_enabled;
122 uint32_t ps_near_level;
123 u64 timestamp;
124 struct regmap *regmap;
125 struct regmap_field *reg_state;
126 struct regmap_field *reg_als_gain;
127 struct regmap_field *reg_ps_gain;
128 struct regmap_field *reg_als_it;
129 struct regmap_field *reg_ps_it;
130 struct regmap_field *reg_int_ps;
131 struct regmap_field *reg_flag_psint;
132 struct regmap_field *reg_flag_nf;
133};
134
135static const struct iio_event_spec stk3310_events[] = {
136 /* Proximity event */
137 {
138 .type = IIO_EV_TYPE_THRESH,
139 .dir = IIO_EV_DIR_RISING,
140 .mask_separate = BIT(IIO_EV_INFO_VALUE) |
141 BIT(IIO_EV_INFO_ENABLE),
142 },
143 /* Out-of-proximity event */
144 {
145 .type = IIO_EV_TYPE_THRESH,
146 .dir = IIO_EV_DIR_FALLING,
147 .mask_separate = BIT(IIO_EV_INFO_VALUE) |
148 BIT(IIO_EV_INFO_ENABLE),
149 },
150};
151
152static ssize_t stk3310_read_near_level(struct iio_dev *indio_dev,
153 uintptr_t priv,
154 const struct iio_chan_spec *chan,
155 char *buf)
156{
157 struct stk3310_data *data = iio_priv(indio_dev);
158
159 return sprintf(buf, "%u\n", data->ps_near_level);
160}
161
162static const struct iio_chan_spec_ext_info stk3310_ext_info[] = {
163 {
164 .name = "nearlevel",
165 .shared = IIO_SEPARATE,
166 .read = stk3310_read_near_level,
167 },
168 { /* sentinel */ }
169};
170
171static const struct iio_chan_spec stk3310_channels[] = {
172 {
173 .type = IIO_LIGHT,
174 .info_mask_separate =
175 BIT(IIO_CHAN_INFO_RAW) |
176 BIT(IIO_CHAN_INFO_SCALE) |
177 BIT(IIO_CHAN_INFO_INT_TIME),
178 },
179 {
180 .type = IIO_PROXIMITY,
181 .info_mask_separate =
182 BIT(IIO_CHAN_INFO_RAW) |
183 BIT(IIO_CHAN_INFO_SCALE) |
184 BIT(IIO_CHAN_INFO_INT_TIME),
185 .event_spec = stk3310_events,
186 .num_event_specs = ARRAY_SIZE(stk3310_events),
187 .ext_info = stk3310_ext_info,
188 }
189};
190
191static IIO_CONST_ATTR(in_illuminance_scale_available, STK3310_SCALE_AVAILABLE);
192
193static IIO_CONST_ATTR(in_proximity_scale_available, STK3310_SCALE_AVAILABLE);
194
195static IIO_CONST_ATTR(in_illuminance_integration_time_available,
196 STK3310_IT_AVAILABLE);
197
198static IIO_CONST_ATTR(in_proximity_integration_time_available,
199 STK3310_IT_AVAILABLE);
200
201static struct attribute *stk3310_attributes[] = {
202 &iio_const_attr_in_illuminance_scale_available.dev_attr.attr,
203 &iio_const_attr_in_proximity_scale_available.dev_attr.attr,
204 &iio_const_attr_in_illuminance_integration_time_available.dev_attr.attr,
205 &iio_const_attr_in_proximity_integration_time_available.dev_attr.attr,
206 NULL,
207};
208
209static const struct attribute_group stk3310_attribute_group = {
210 .attrs = stk3310_attributes
211};
212
213static int stk3310_check_chip_id(const u8 chip_id)
214{
215 for (int i = 0; i < ARRAY_SIZE(stk3310_chip_ids); i++) {
216 if (chip_id == stk3310_chip_ids[i])
217 return 0;
218 }
219
220 return -ENODEV;
221}
222
223static int stk3310_get_index(const int table[][2], int table_size,
224 int val, int val2)
225{
226 int i;
227
228 for (i = 0; i < table_size; i++) {
229 if (val == table[i][0] && val2 == table[i][1])
230 return i;
231 }
232
233 return -EINVAL;
234}
235
236static int stk3310_read_event(struct iio_dev *indio_dev,
237 const struct iio_chan_spec *chan,
238 enum iio_event_type type,
239 enum iio_event_direction dir,
240 enum iio_event_info info,
241 int *val, int *val2)
242{
243 u8 reg;
244 __be16 buf;
245 int ret;
246 struct stk3310_data *data = iio_priv(indio_dev);
247
248 if (info != IIO_EV_INFO_VALUE)
249 return -EINVAL;
250
251 /* Only proximity interrupts are implemented at the moment. */
252 if (dir == IIO_EV_DIR_RISING)
253 reg = STK3310_REG_THDH_PS;
254 else if (dir == IIO_EV_DIR_FALLING)
255 reg = STK3310_REG_THDL_PS;
256 else
257 return -EINVAL;
258
259 mutex_lock(&data->lock);
260 ret = regmap_bulk_read(data->regmap, reg, &buf, 2);
261 mutex_unlock(&data->lock);
262 if (ret < 0) {
263 dev_err(&data->client->dev, "register read failed\n");
264 return ret;
265 }
266 *val = be16_to_cpu(buf);
267
268 return IIO_VAL_INT;
269}
270
271static int stk3310_write_event(struct iio_dev *indio_dev,
272 const struct iio_chan_spec *chan,
273 enum iio_event_type type,
274 enum iio_event_direction dir,
275 enum iio_event_info info,
276 int val, int val2)
277{
278 u8 reg;
279 __be16 buf;
280 int ret;
281 unsigned int index;
282 struct stk3310_data *data = iio_priv(indio_dev);
283 struct i2c_client *client = data->client;
284
285 ret = regmap_field_read(data->reg_ps_gain, &index);
286 if (ret < 0)
287 return ret;
288
289 if (val < 0 || val > stk3310_ps_max[index])
290 return -EINVAL;
291
292 if (dir == IIO_EV_DIR_RISING)
293 reg = STK3310_REG_THDH_PS;
294 else if (dir == IIO_EV_DIR_FALLING)
295 reg = STK3310_REG_THDL_PS;
296 else
297 return -EINVAL;
298
299 buf = cpu_to_be16(val);
300 ret = regmap_bulk_write(data->regmap, reg, &buf, 2);
301 if (ret < 0)
302 dev_err(&client->dev, "failed to set PS threshold!\n");
303
304 return ret;
305}
306
307static int stk3310_read_event_config(struct iio_dev *indio_dev,
308 const struct iio_chan_spec *chan,
309 enum iio_event_type type,
310 enum iio_event_direction dir)
311{
312 unsigned int event_val;
313 int ret;
314 struct stk3310_data *data = iio_priv(indio_dev);
315
316 ret = regmap_field_read(data->reg_int_ps, &event_val);
317 if (ret < 0)
318 return ret;
319
320 return event_val;
321}
322
323static int stk3310_write_event_config(struct iio_dev *indio_dev,
324 const struct iio_chan_spec *chan,
325 enum iio_event_type type,
326 enum iio_event_direction dir,
327 bool state)
328{
329 int ret;
330 struct stk3310_data *data = iio_priv(indio_dev);
331 struct i2c_client *client = data->client;
332
333 /* Set INT_PS value */
334 mutex_lock(&data->lock);
335 ret = regmap_field_write(data->reg_int_ps, state);
336 if (ret < 0)
337 dev_err(&client->dev, "failed to set interrupt mode\n");
338 mutex_unlock(&data->lock);
339
340 return ret;
341}
342
343static int stk3310_read_raw(struct iio_dev *indio_dev,
344 struct iio_chan_spec const *chan,
345 int *val, int *val2, long mask)
346{
347 u8 reg;
348 __be16 buf;
349 int ret;
350 unsigned int index;
351 struct stk3310_data *data = iio_priv(indio_dev);
352 struct i2c_client *client = data->client;
353
354 if (chan->type != IIO_LIGHT && chan->type != IIO_PROXIMITY)
355 return -EINVAL;
356
357 switch (mask) {
358 case IIO_CHAN_INFO_RAW:
359 if (chan->type == IIO_LIGHT)
360 reg = STK3310_REG_ALS_DATA_MSB;
361 else
362 reg = STK3310_REG_PS_DATA_MSB;
363
364 mutex_lock(&data->lock);
365 ret = regmap_bulk_read(data->regmap, reg, &buf, 2);
366 if (ret < 0) {
367 dev_err(&client->dev, "register read failed\n");
368 mutex_unlock(&data->lock);
369 return ret;
370 }
371 *val = be16_to_cpu(buf);
372 mutex_unlock(&data->lock);
373 return IIO_VAL_INT;
374 case IIO_CHAN_INFO_INT_TIME:
375 if (chan->type == IIO_LIGHT)
376 ret = regmap_field_read(data->reg_als_it, &index);
377 else
378 ret = regmap_field_read(data->reg_ps_it, &index);
379 if (ret < 0)
380 return ret;
381
382 *val = stk3310_it_table[index][0];
383 *val2 = stk3310_it_table[index][1];
384 return IIO_VAL_INT_PLUS_MICRO;
385 case IIO_CHAN_INFO_SCALE:
386 if (chan->type == IIO_LIGHT)
387 ret = regmap_field_read(data->reg_als_gain, &index);
388 else
389 ret = regmap_field_read(data->reg_ps_gain, &index);
390 if (ret < 0)
391 return ret;
392
393 *val = stk3310_scale_table[index][0];
394 *val2 = stk3310_scale_table[index][1];
395 return IIO_VAL_INT_PLUS_MICRO;
396 }
397
398 return -EINVAL;
399}
400
401static int stk3310_write_raw(struct iio_dev *indio_dev,
402 struct iio_chan_spec const *chan,
403 int val, int val2, long mask)
404{
405 int ret;
406 int index;
407 struct stk3310_data *data = iio_priv(indio_dev);
408
409 if (chan->type != IIO_LIGHT && chan->type != IIO_PROXIMITY)
410 return -EINVAL;
411
412 switch (mask) {
413 case IIO_CHAN_INFO_INT_TIME:
414 index = stk3310_get_index(stk3310_it_table,
415 ARRAY_SIZE(stk3310_it_table),
416 val, val2);
417 if (index < 0)
418 return -EINVAL;
419 mutex_lock(&data->lock);
420 if (chan->type == IIO_LIGHT)
421 ret = regmap_field_write(data->reg_als_it, index);
422 else
423 ret = regmap_field_write(data->reg_ps_it, index);
424 if (ret < 0)
425 dev_err(&data->client->dev,
426 "sensor configuration failed\n");
427 mutex_unlock(&data->lock);
428 return ret;
429
430 case IIO_CHAN_INFO_SCALE:
431 index = stk3310_get_index(stk3310_scale_table,
432 ARRAY_SIZE(stk3310_scale_table),
433 val, val2);
434 if (index < 0)
435 return -EINVAL;
436 mutex_lock(&data->lock);
437 if (chan->type == IIO_LIGHT)
438 ret = regmap_field_write(data->reg_als_gain, index);
439 else
440 ret = regmap_field_write(data->reg_ps_gain, index);
441 if (ret < 0)
442 dev_err(&data->client->dev,
443 "sensor configuration failed\n");
444 mutex_unlock(&data->lock);
445 return ret;
446 }
447
448 return -EINVAL;
449}
450
451static const struct iio_info stk3310_info = {
452 .read_raw = stk3310_read_raw,
453 .write_raw = stk3310_write_raw,
454 .attrs = &stk3310_attribute_group,
455 .read_event_value = stk3310_read_event,
456 .write_event_value = stk3310_write_event,
457 .read_event_config = stk3310_read_event_config,
458 .write_event_config = stk3310_write_event_config,
459};
460
461static int stk3310_set_state(struct stk3310_data *data, u8 state)
462{
463 int ret;
464 struct i2c_client *client = data->client;
465
466 /* 3-bit state; 0b100 is not supported. */
467 if (state > 7 || state == 4)
468 return -EINVAL;
469
470 mutex_lock(&data->lock);
471 ret = regmap_field_write(data->reg_state, state);
472 if (ret < 0) {
473 dev_err(&client->dev, "failed to change sensor state\n");
474 } else if (state != STK3310_STATE_STANDBY) {
475 /* Don't reset the 'enabled' flags if we're going in standby */
476 data->ps_enabled = !!(state & STK3310_STATE_EN_PS);
477 data->als_enabled = !!(state & STK3310_STATE_EN_ALS);
478 }
479 mutex_unlock(&data->lock);
480
481 return ret;
482}
483
484static int stk3310_init(struct iio_dev *indio_dev)
485{
486 int ret;
487 int chipid;
488 u8 state;
489 struct stk3310_data *data = iio_priv(indio_dev);
490 struct i2c_client *client = data->client;
491
492 ret = regmap_read(data->regmap, STK3310_REG_ID, &chipid);
493 if (ret < 0)
494 return ret;
495
496 ret = stk3310_check_chip_id(chipid);
497 if (ret < 0)
498 dev_info(&client->dev, "new unknown chip id: 0x%x\n", chipid);
499
500 state = STK3310_STATE_EN_ALS | STK3310_STATE_EN_PS;
501 ret = stk3310_set_state(data, state);
502 if (ret < 0) {
503 dev_err(&client->dev, "failed to enable sensor");
504 return ret;
505 }
506
507 /* Enable PS interrupts */
508 ret = regmap_field_write(data->reg_int_ps, STK3310_PSINT_EN);
509 if (ret < 0)
510 dev_err(&client->dev, "failed to enable interrupts!\n");
511
512 return ret;
513}
514
515static bool stk3310_is_volatile_reg(struct device *dev, unsigned int reg)
516{
517 switch (reg) {
518 case STK3310_REG_ALS_DATA_MSB:
519 case STK3310_REG_ALS_DATA_LSB:
520 case STK3310_REG_PS_DATA_LSB:
521 case STK3310_REG_PS_DATA_MSB:
522 case STK3310_REG_FLAG:
523 return true;
524 default:
525 return false;
526 }
527}
528
529static const struct regmap_config stk3310_regmap_config = {
530 .name = STK3310_REGMAP_NAME,
531 .reg_bits = 8,
532 .val_bits = 8,
533 .max_register = STK3310_MAX_REG,
534 .cache_type = REGCACHE_RBTREE,
535 .volatile_reg = stk3310_is_volatile_reg,
536};
537
538static int stk3310_regmap_init(struct stk3310_data *data)
539{
540 struct regmap *regmap;
541 struct i2c_client *client;
542
543 client = data->client;
544 regmap = devm_regmap_init_i2c(client, &stk3310_regmap_config);
545 if (IS_ERR(regmap)) {
546 dev_err(&client->dev, "regmap initialization failed.\n");
547 return PTR_ERR(regmap);
548 }
549 data->regmap = regmap;
550
551 STK3310_REGFIELD(state);
552 STK3310_REGFIELD(als_gain);
553 STK3310_REGFIELD(ps_gain);
554 STK3310_REGFIELD(als_it);
555 STK3310_REGFIELD(ps_it);
556 STK3310_REGFIELD(int_ps);
557 STK3310_REGFIELD(flag_psint);
558 STK3310_REGFIELD(flag_nf);
559
560 return 0;
561}
562
563static irqreturn_t stk3310_irq_handler(int irq, void *private)
564{
565 struct iio_dev *indio_dev = private;
566 struct stk3310_data *data = iio_priv(indio_dev);
567
568 data->timestamp = iio_get_time_ns(indio_dev);
569
570 return IRQ_WAKE_THREAD;
571}
572
573static irqreturn_t stk3310_irq_event_handler(int irq, void *private)
574{
575 int ret;
576 unsigned int dir;
577 u64 event;
578
579 struct iio_dev *indio_dev = private;
580 struct stk3310_data *data = iio_priv(indio_dev);
581
582 /* Read FLAG_NF to figure out what threshold has been met. */
583 mutex_lock(&data->lock);
584 ret = regmap_field_read(data->reg_flag_nf, &dir);
585 if (ret < 0) {
586 dev_err(&data->client->dev, "register read failed: %d\n", ret);
587 goto out;
588 }
589 event = IIO_UNMOD_EVENT_CODE(IIO_PROXIMITY, 1,
590 IIO_EV_TYPE_THRESH,
591 (dir ? IIO_EV_DIR_FALLING :
592 IIO_EV_DIR_RISING));
593 iio_push_event(indio_dev, event, data->timestamp);
594
595 /* Reset the interrupt flag */
596 ret = regmap_field_write(data->reg_flag_psint, 0);
597 if (ret < 0)
598 dev_err(&data->client->dev, "failed to reset interrupts\n");
599out:
600 mutex_unlock(&data->lock);
601
602 return IRQ_HANDLED;
603}
604
605static int stk3310_probe(struct i2c_client *client)
606{
607 int ret;
608 struct iio_dev *indio_dev;
609 struct stk3310_data *data;
610
611 indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data));
612 if (!indio_dev) {
613 dev_err(&client->dev, "iio allocation failed!\n");
614 return -ENOMEM;
615 }
616
617 data = iio_priv(indio_dev);
618 data->client = client;
619 i2c_set_clientdata(client, indio_dev);
620
621 device_property_read_u32(&client->dev, "proximity-near-level",
622 &data->ps_near_level);
623
624 mutex_init(&data->lock);
625
626 ret = stk3310_regmap_init(data);
627 if (ret < 0)
628 return ret;
629
630 indio_dev->info = &stk3310_info;
631 indio_dev->name = STK3310_DRIVER_NAME;
632 indio_dev->modes = INDIO_DIRECT_MODE;
633 indio_dev->channels = stk3310_channels;
634 indio_dev->num_channels = ARRAY_SIZE(stk3310_channels);
635
636 ret = stk3310_init(indio_dev);
637 if (ret < 0)
638 return ret;
639
640 if (client->irq > 0) {
641 ret = devm_request_threaded_irq(&client->dev, client->irq,
642 stk3310_irq_handler,
643 stk3310_irq_event_handler,
644 IRQF_TRIGGER_FALLING |
645 IRQF_ONESHOT,
646 STK3310_EVENT, indio_dev);
647 if (ret < 0) {
648 dev_err(&client->dev, "request irq %d failed\n",
649 client->irq);
650 goto err_standby;
651 }
652 }
653
654 ret = iio_device_register(indio_dev);
655 if (ret < 0) {
656 dev_err(&client->dev, "device_register failed\n");
657 goto err_standby;
658 }
659
660 return 0;
661
662err_standby:
663 stk3310_set_state(data, STK3310_STATE_STANDBY);
664 return ret;
665}
666
667static void stk3310_remove(struct i2c_client *client)
668{
669 struct iio_dev *indio_dev = i2c_get_clientdata(client);
670
671 iio_device_unregister(indio_dev);
672 stk3310_set_state(iio_priv(indio_dev), STK3310_STATE_STANDBY);
673}
674
675static int stk3310_suspend(struct device *dev)
676{
677 struct stk3310_data *data;
678
679 data = iio_priv(i2c_get_clientdata(to_i2c_client(dev)));
680
681 return stk3310_set_state(data, STK3310_STATE_STANDBY);
682}
683
684static int stk3310_resume(struct device *dev)
685{
686 u8 state = 0;
687 struct stk3310_data *data;
688
689 data = iio_priv(i2c_get_clientdata(to_i2c_client(dev)));
690 if (data->ps_enabled)
691 state |= STK3310_STATE_EN_PS;
692 if (data->als_enabled)
693 state |= STK3310_STATE_EN_ALS;
694
695 return stk3310_set_state(data, state);
696}
697
698static DEFINE_SIMPLE_DEV_PM_OPS(stk3310_pm_ops, stk3310_suspend,
699 stk3310_resume);
700
701static const struct i2c_device_id stk3310_i2c_id[] = {
702 { "STK3013" },
703 { "STK3310" },
704 { "STK3311" },
705 { "STK3335" },
706 {}
707};
708MODULE_DEVICE_TABLE(i2c, stk3310_i2c_id);
709
710static const struct acpi_device_id stk3310_acpi_id[] = {
711 {"STK3013", 0},
712 {"STK3310", 0},
713 {"STK3311", 0},
714 {}
715};
716
717MODULE_DEVICE_TABLE(acpi, stk3310_acpi_id);
718
719static const struct of_device_id stk3310_of_match[] = {
720 { .compatible = "sensortek,stk3013", },
721 { .compatible = "sensortek,stk3310", },
722 { .compatible = "sensortek,stk3311", },
723 { .compatible = "sensortek,stk3335", },
724 {}
725};
726MODULE_DEVICE_TABLE(of, stk3310_of_match);
727
728static struct i2c_driver stk3310_driver = {
729 .driver = {
730 .name = "stk3310",
731 .of_match_table = stk3310_of_match,
732 .pm = pm_sleep_ptr(&stk3310_pm_ops),
733 .acpi_match_table = stk3310_acpi_id,
734 },
735 .probe = stk3310_probe,
736 .remove = stk3310_remove,
737 .id_table = stk3310_i2c_id,
738};
739
740module_i2c_driver(stk3310_driver);
741
742MODULE_AUTHOR("Tiberiu Breana <tiberiu.a.breana@intel.com>");
743MODULE_DESCRIPTION("STK3310 Ambient Light and Proximity Sensor driver");
744MODULE_LICENSE("GPL v2");
1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Sensortek STK3310/STK3311 Ambient Light and Proximity Sensor
4 *
5 * Copyright (c) 2015, Intel Corporation.
6 *
7 * IIO driver for STK3310/STK3311. 7-bit I2C address: 0x48.
8 */
9
10#include <linux/acpi.h>
11#include <linux/i2c.h>
12#include <linux/interrupt.h>
13#include <linux/kernel.h>
14#include <linux/module.h>
15#include <linux/regmap.h>
16#include <linux/iio/events.h>
17#include <linux/iio/iio.h>
18#include <linux/iio/sysfs.h>
19
20#define STK3310_REG_STATE 0x00
21#define STK3310_REG_PSCTRL 0x01
22#define STK3310_REG_ALSCTRL 0x02
23#define STK3310_REG_INT 0x04
24#define STK3310_REG_THDH_PS 0x06
25#define STK3310_REG_THDL_PS 0x08
26#define STK3310_REG_FLAG 0x10
27#define STK3310_REG_PS_DATA_MSB 0x11
28#define STK3310_REG_PS_DATA_LSB 0x12
29#define STK3310_REG_ALS_DATA_MSB 0x13
30#define STK3310_REG_ALS_DATA_LSB 0x14
31#define STK3310_REG_ID 0x3E
32#define STK3310_MAX_REG 0x80
33
34#define STK3310_STATE_EN_PS BIT(0)
35#define STK3310_STATE_EN_ALS BIT(1)
36#define STK3310_STATE_STANDBY 0x00
37
38#define STK3310_CHIP_ID_VAL 0x13
39#define STK3311_CHIP_ID_VAL 0x1D
40#define STK3311X_CHIP_ID_VAL 0x12
41#define STK3335_CHIP_ID_VAL 0x51
42#define STK3310_PSINT_EN 0x01
43#define STK3310_PS_MAX_VAL 0xFFFF
44
45#define STK3310_DRIVER_NAME "stk3310"
46#define STK3310_REGMAP_NAME "stk3310_regmap"
47#define STK3310_EVENT "stk3310_event"
48
49#define STK3310_SCALE_AVAILABLE "6.4 1.6 0.4 0.1"
50
51#define STK3310_IT_AVAILABLE \
52 "0.000185 0.000370 0.000741 0.001480 0.002960 0.005920 0.011840 " \
53 "0.023680 0.047360 0.094720 0.189440 0.378880 0.757760 1.515520 " \
54 "3.031040 6.062080"
55
56#define STK3310_REGFIELD(name) \
57 do { \
58 data->reg_##name = \
59 devm_regmap_field_alloc(&client->dev, regmap, \
60 stk3310_reg_field_##name); \
61 if (IS_ERR(data->reg_##name)) { \
62 dev_err(&client->dev, "reg field alloc failed.\n"); \
63 return PTR_ERR(data->reg_##name); \
64 } \
65 } while (0)
66
67static const struct reg_field stk3310_reg_field_state =
68 REG_FIELD(STK3310_REG_STATE, 0, 2);
69static const struct reg_field stk3310_reg_field_als_gain =
70 REG_FIELD(STK3310_REG_ALSCTRL, 4, 5);
71static const struct reg_field stk3310_reg_field_ps_gain =
72 REG_FIELD(STK3310_REG_PSCTRL, 4, 5);
73static const struct reg_field stk3310_reg_field_als_it =
74 REG_FIELD(STK3310_REG_ALSCTRL, 0, 3);
75static const struct reg_field stk3310_reg_field_ps_it =
76 REG_FIELD(STK3310_REG_PSCTRL, 0, 3);
77static const struct reg_field stk3310_reg_field_int_ps =
78 REG_FIELD(STK3310_REG_INT, 0, 2);
79static const struct reg_field stk3310_reg_field_flag_psint =
80 REG_FIELD(STK3310_REG_FLAG, 4, 4);
81static const struct reg_field stk3310_reg_field_flag_nf =
82 REG_FIELD(STK3310_REG_FLAG, 0, 0);
83
84/* Estimate maximum proximity values with regard to measurement scale. */
85static const int stk3310_ps_max[4] = {
86 STK3310_PS_MAX_VAL / 640,
87 STK3310_PS_MAX_VAL / 160,
88 STK3310_PS_MAX_VAL / 40,
89 STK3310_PS_MAX_VAL / 10
90};
91
92static const int stk3310_scale_table[][2] = {
93 {6, 400000}, {1, 600000}, {0, 400000}, {0, 100000}
94};
95
96/* Integration time in seconds, microseconds */
97static const int stk3310_it_table[][2] = {
98 {0, 185}, {0, 370}, {0, 741}, {0, 1480},
99 {0, 2960}, {0, 5920}, {0, 11840}, {0, 23680},
100 {0, 47360}, {0, 94720}, {0, 189440}, {0, 378880},
101 {0, 757760}, {1, 515520}, {3, 31040}, {6, 62080},
102};
103
104struct stk3310_data {
105 struct i2c_client *client;
106 struct mutex lock;
107 bool als_enabled;
108 bool ps_enabled;
109 uint32_t ps_near_level;
110 u64 timestamp;
111 struct regmap *regmap;
112 struct regmap_field *reg_state;
113 struct regmap_field *reg_als_gain;
114 struct regmap_field *reg_ps_gain;
115 struct regmap_field *reg_als_it;
116 struct regmap_field *reg_ps_it;
117 struct regmap_field *reg_int_ps;
118 struct regmap_field *reg_flag_psint;
119 struct regmap_field *reg_flag_nf;
120};
121
122static const struct iio_event_spec stk3310_events[] = {
123 /* Proximity event */
124 {
125 .type = IIO_EV_TYPE_THRESH,
126 .dir = IIO_EV_DIR_RISING,
127 .mask_separate = BIT(IIO_EV_INFO_VALUE) |
128 BIT(IIO_EV_INFO_ENABLE),
129 },
130 /* Out-of-proximity event */
131 {
132 .type = IIO_EV_TYPE_THRESH,
133 .dir = IIO_EV_DIR_FALLING,
134 .mask_separate = BIT(IIO_EV_INFO_VALUE) |
135 BIT(IIO_EV_INFO_ENABLE),
136 },
137};
138
139static ssize_t stk3310_read_near_level(struct iio_dev *indio_dev,
140 uintptr_t priv,
141 const struct iio_chan_spec *chan,
142 char *buf)
143{
144 struct stk3310_data *data = iio_priv(indio_dev);
145
146 return sprintf(buf, "%u\n", data->ps_near_level);
147}
148
149static const struct iio_chan_spec_ext_info stk3310_ext_info[] = {
150 {
151 .name = "nearlevel",
152 .shared = IIO_SEPARATE,
153 .read = stk3310_read_near_level,
154 },
155 { /* sentinel */ }
156};
157
158static const struct iio_chan_spec stk3310_channels[] = {
159 {
160 .type = IIO_LIGHT,
161 .info_mask_separate =
162 BIT(IIO_CHAN_INFO_RAW) |
163 BIT(IIO_CHAN_INFO_SCALE) |
164 BIT(IIO_CHAN_INFO_INT_TIME),
165 },
166 {
167 .type = IIO_PROXIMITY,
168 .info_mask_separate =
169 BIT(IIO_CHAN_INFO_RAW) |
170 BIT(IIO_CHAN_INFO_SCALE) |
171 BIT(IIO_CHAN_INFO_INT_TIME),
172 .event_spec = stk3310_events,
173 .num_event_specs = ARRAY_SIZE(stk3310_events),
174 .ext_info = stk3310_ext_info,
175 }
176};
177
178static IIO_CONST_ATTR(in_illuminance_scale_available, STK3310_SCALE_AVAILABLE);
179
180static IIO_CONST_ATTR(in_proximity_scale_available, STK3310_SCALE_AVAILABLE);
181
182static IIO_CONST_ATTR(in_illuminance_integration_time_available,
183 STK3310_IT_AVAILABLE);
184
185static IIO_CONST_ATTR(in_proximity_integration_time_available,
186 STK3310_IT_AVAILABLE);
187
188static struct attribute *stk3310_attributes[] = {
189 &iio_const_attr_in_illuminance_scale_available.dev_attr.attr,
190 &iio_const_attr_in_proximity_scale_available.dev_attr.attr,
191 &iio_const_attr_in_illuminance_integration_time_available.dev_attr.attr,
192 &iio_const_attr_in_proximity_integration_time_available.dev_attr.attr,
193 NULL,
194};
195
196static const struct attribute_group stk3310_attribute_group = {
197 .attrs = stk3310_attributes
198};
199
200static int stk3310_get_index(const int table[][2], int table_size,
201 int val, int val2)
202{
203 int i;
204
205 for (i = 0; i < table_size; i++) {
206 if (val == table[i][0] && val2 == table[i][1])
207 return i;
208 }
209
210 return -EINVAL;
211}
212
213static int stk3310_read_event(struct iio_dev *indio_dev,
214 const struct iio_chan_spec *chan,
215 enum iio_event_type type,
216 enum iio_event_direction dir,
217 enum iio_event_info info,
218 int *val, int *val2)
219{
220 u8 reg;
221 __be16 buf;
222 int ret;
223 struct stk3310_data *data = iio_priv(indio_dev);
224
225 if (info != IIO_EV_INFO_VALUE)
226 return -EINVAL;
227
228 /* Only proximity interrupts are implemented at the moment. */
229 if (dir == IIO_EV_DIR_RISING)
230 reg = STK3310_REG_THDH_PS;
231 else if (dir == IIO_EV_DIR_FALLING)
232 reg = STK3310_REG_THDL_PS;
233 else
234 return -EINVAL;
235
236 mutex_lock(&data->lock);
237 ret = regmap_bulk_read(data->regmap, reg, &buf, 2);
238 mutex_unlock(&data->lock);
239 if (ret < 0) {
240 dev_err(&data->client->dev, "register read failed\n");
241 return ret;
242 }
243 *val = be16_to_cpu(buf);
244
245 return IIO_VAL_INT;
246}
247
248static int stk3310_write_event(struct iio_dev *indio_dev,
249 const struct iio_chan_spec *chan,
250 enum iio_event_type type,
251 enum iio_event_direction dir,
252 enum iio_event_info info,
253 int val, int val2)
254{
255 u8 reg;
256 __be16 buf;
257 int ret;
258 unsigned int index;
259 struct stk3310_data *data = iio_priv(indio_dev);
260 struct i2c_client *client = data->client;
261
262 ret = regmap_field_read(data->reg_ps_gain, &index);
263 if (ret < 0)
264 return ret;
265
266 if (val < 0 || val > stk3310_ps_max[index])
267 return -EINVAL;
268
269 if (dir == IIO_EV_DIR_RISING)
270 reg = STK3310_REG_THDH_PS;
271 else if (dir == IIO_EV_DIR_FALLING)
272 reg = STK3310_REG_THDL_PS;
273 else
274 return -EINVAL;
275
276 buf = cpu_to_be16(val);
277 ret = regmap_bulk_write(data->regmap, reg, &buf, 2);
278 if (ret < 0)
279 dev_err(&client->dev, "failed to set PS threshold!\n");
280
281 return ret;
282}
283
284static int stk3310_read_event_config(struct iio_dev *indio_dev,
285 const struct iio_chan_spec *chan,
286 enum iio_event_type type,
287 enum iio_event_direction dir)
288{
289 unsigned int event_val;
290 int ret;
291 struct stk3310_data *data = iio_priv(indio_dev);
292
293 ret = regmap_field_read(data->reg_int_ps, &event_val);
294 if (ret < 0)
295 return ret;
296
297 return event_val;
298}
299
300static int stk3310_write_event_config(struct iio_dev *indio_dev,
301 const struct iio_chan_spec *chan,
302 enum iio_event_type type,
303 enum iio_event_direction dir,
304 int state)
305{
306 int ret;
307 struct stk3310_data *data = iio_priv(indio_dev);
308 struct i2c_client *client = data->client;
309
310 if (state < 0 || state > 7)
311 return -EINVAL;
312
313 /* Set INT_PS value */
314 mutex_lock(&data->lock);
315 ret = regmap_field_write(data->reg_int_ps, state);
316 if (ret < 0)
317 dev_err(&client->dev, "failed to set interrupt mode\n");
318 mutex_unlock(&data->lock);
319
320 return ret;
321}
322
323static int stk3310_read_raw(struct iio_dev *indio_dev,
324 struct iio_chan_spec const *chan,
325 int *val, int *val2, long mask)
326{
327 u8 reg;
328 __be16 buf;
329 int ret;
330 unsigned int index;
331 struct stk3310_data *data = iio_priv(indio_dev);
332 struct i2c_client *client = data->client;
333
334 if (chan->type != IIO_LIGHT && chan->type != IIO_PROXIMITY)
335 return -EINVAL;
336
337 switch (mask) {
338 case IIO_CHAN_INFO_RAW:
339 if (chan->type == IIO_LIGHT)
340 reg = STK3310_REG_ALS_DATA_MSB;
341 else
342 reg = STK3310_REG_PS_DATA_MSB;
343
344 mutex_lock(&data->lock);
345 ret = regmap_bulk_read(data->regmap, reg, &buf, 2);
346 if (ret < 0) {
347 dev_err(&client->dev, "register read failed\n");
348 mutex_unlock(&data->lock);
349 return ret;
350 }
351 *val = be16_to_cpu(buf);
352 mutex_unlock(&data->lock);
353 return IIO_VAL_INT;
354 case IIO_CHAN_INFO_INT_TIME:
355 if (chan->type == IIO_LIGHT)
356 ret = regmap_field_read(data->reg_als_it, &index);
357 else
358 ret = regmap_field_read(data->reg_ps_it, &index);
359 if (ret < 0)
360 return ret;
361
362 *val = stk3310_it_table[index][0];
363 *val2 = stk3310_it_table[index][1];
364 return IIO_VAL_INT_PLUS_MICRO;
365 case IIO_CHAN_INFO_SCALE:
366 if (chan->type == IIO_LIGHT)
367 ret = regmap_field_read(data->reg_als_gain, &index);
368 else
369 ret = regmap_field_read(data->reg_ps_gain, &index);
370 if (ret < 0)
371 return ret;
372
373 *val = stk3310_scale_table[index][0];
374 *val2 = stk3310_scale_table[index][1];
375 return IIO_VAL_INT_PLUS_MICRO;
376 }
377
378 return -EINVAL;
379}
380
381static int stk3310_write_raw(struct iio_dev *indio_dev,
382 struct iio_chan_spec const *chan,
383 int val, int val2, long mask)
384{
385 int ret;
386 int index;
387 struct stk3310_data *data = iio_priv(indio_dev);
388
389 if (chan->type != IIO_LIGHT && chan->type != IIO_PROXIMITY)
390 return -EINVAL;
391
392 switch (mask) {
393 case IIO_CHAN_INFO_INT_TIME:
394 index = stk3310_get_index(stk3310_it_table,
395 ARRAY_SIZE(stk3310_it_table),
396 val, val2);
397 if (index < 0)
398 return -EINVAL;
399 mutex_lock(&data->lock);
400 if (chan->type == IIO_LIGHT)
401 ret = regmap_field_write(data->reg_als_it, index);
402 else
403 ret = regmap_field_write(data->reg_ps_it, index);
404 if (ret < 0)
405 dev_err(&data->client->dev,
406 "sensor configuration failed\n");
407 mutex_unlock(&data->lock);
408 return ret;
409
410 case IIO_CHAN_INFO_SCALE:
411 index = stk3310_get_index(stk3310_scale_table,
412 ARRAY_SIZE(stk3310_scale_table),
413 val, val2);
414 if (index < 0)
415 return -EINVAL;
416 mutex_lock(&data->lock);
417 if (chan->type == IIO_LIGHT)
418 ret = regmap_field_write(data->reg_als_gain, index);
419 else
420 ret = regmap_field_write(data->reg_ps_gain, index);
421 if (ret < 0)
422 dev_err(&data->client->dev,
423 "sensor configuration failed\n");
424 mutex_unlock(&data->lock);
425 return ret;
426 }
427
428 return -EINVAL;
429}
430
431static const struct iio_info stk3310_info = {
432 .read_raw = stk3310_read_raw,
433 .write_raw = stk3310_write_raw,
434 .attrs = &stk3310_attribute_group,
435 .read_event_value = stk3310_read_event,
436 .write_event_value = stk3310_write_event,
437 .read_event_config = stk3310_read_event_config,
438 .write_event_config = stk3310_write_event_config,
439};
440
441static int stk3310_set_state(struct stk3310_data *data, u8 state)
442{
443 int ret;
444 struct i2c_client *client = data->client;
445
446 /* 3-bit state; 0b100 is not supported. */
447 if (state > 7 || state == 4)
448 return -EINVAL;
449
450 mutex_lock(&data->lock);
451 ret = regmap_field_write(data->reg_state, state);
452 if (ret < 0) {
453 dev_err(&client->dev, "failed to change sensor state\n");
454 } else if (state != STK3310_STATE_STANDBY) {
455 /* Don't reset the 'enabled' flags if we're going in standby */
456 data->ps_enabled = !!(state & STK3310_STATE_EN_PS);
457 data->als_enabled = !!(state & STK3310_STATE_EN_ALS);
458 }
459 mutex_unlock(&data->lock);
460
461 return ret;
462}
463
464static int stk3310_init(struct iio_dev *indio_dev)
465{
466 int ret;
467 int chipid;
468 u8 state;
469 struct stk3310_data *data = iio_priv(indio_dev);
470 struct i2c_client *client = data->client;
471
472 ret = regmap_read(data->regmap, STK3310_REG_ID, &chipid);
473 if (ret < 0)
474 return ret;
475
476 if (chipid != STK3310_CHIP_ID_VAL &&
477 chipid != STK3311_CHIP_ID_VAL &&
478 chipid != STK3311X_CHIP_ID_VAL &&
479 chipid != STK3335_CHIP_ID_VAL) {
480 dev_err(&client->dev, "invalid chip id: 0x%x\n", chipid);
481 return -ENODEV;
482 }
483
484 state = STK3310_STATE_EN_ALS | STK3310_STATE_EN_PS;
485 ret = stk3310_set_state(data, state);
486 if (ret < 0) {
487 dev_err(&client->dev, "failed to enable sensor");
488 return ret;
489 }
490
491 /* Enable PS interrupts */
492 ret = regmap_field_write(data->reg_int_ps, STK3310_PSINT_EN);
493 if (ret < 0)
494 dev_err(&client->dev, "failed to enable interrupts!\n");
495
496 return ret;
497}
498
499static bool stk3310_is_volatile_reg(struct device *dev, unsigned int reg)
500{
501 switch (reg) {
502 case STK3310_REG_ALS_DATA_MSB:
503 case STK3310_REG_ALS_DATA_LSB:
504 case STK3310_REG_PS_DATA_LSB:
505 case STK3310_REG_PS_DATA_MSB:
506 case STK3310_REG_FLAG:
507 return true;
508 default:
509 return false;
510 }
511}
512
513static const struct regmap_config stk3310_regmap_config = {
514 .name = STK3310_REGMAP_NAME,
515 .reg_bits = 8,
516 .val_bits = 8,
517 .max_register = STK3310_MAX_REG,
518 .cache_type = REGCACHE_RBTREE,
519 .volatile_reg = stk3310_is_volatile_reg,
520};
521
522static int stk3310_regmap_init(struct stk3310_data *data)
523{
524 struct regmap *regmap;
525 struct i2c_client *client;
526
527 client = data->client;
528 regmap = devm_regmap_init_i2c(client, &stk3310_regmap_config);
529 if (IS_ERR(regmap)) {
530 dev_err(&client->dev, "regmap initialization failed.\n");
531 return PTR_ERR(regmap);
532 }
533 data->regmap = regmap;
534
535 STK3310_REGFIELD(state);
536 STK3310_REGFIELD(als_gain);
537 STK3310_REGFIELD(ps_gain);
538 STK3310_REGFIELD(als_it);
539 STK3310_REGFIELD(ps_it);
540 STK3310_REGFIELD(int_ps);
541 STK3310_REGFIELD(flag_psint);
542 STK3310_REGFIELD(flag_nf);
543
544 return 0;
545}
546
547static irqreturn_t stk3310_irq_handler(int irq, void *private)
548{
549 struct iio_dev *indio_dev = private;
550 struct stk3310_data *data = iio_priv(indio_dev);
551
552 data->timestamp = iio_get_time_ns(indio_dev);
553
554 return IRQ_WAKE_THREAD;
555}
556
557static irqreturn_t stk3310_irq_event_handler(int irq, void *private)
558{
559 int ret;
560 unsigned int dir;
561 u64 event;
562
563 struct iio_dev *indio_dev = private;
564 struct stk3310_data *data = iio_priv(indio_dev);
565
566 /* Read FLAG_NF to figure out what threshold has been met. */
567 mutex_lock(&data->lock);
568 ret = regmap_field_read(data->reg_flag_nf, &dir);
569 if (ret < 0) {
570 dev_err(&data->client->dev, "register read failed: %d\n", ret);
571 goto out;
572 }
573 event = IIO_UNMOD_EVENT_CODE(IIO_PROXIMITY, 1,
574 IIO_EV_TYPE_THRESH,
575 (dir ? IIO_EV_DIR_FALLING :
576 IIO_EV_DIR_RISING));
577 iio_push_event(indio_dev, event, data->timestamp);
578
579 /* Reset the interrupt flag */
580 ret = regmap_field_write(data->reg_flag_psint, 0);
581 if (ret < 0)
582 dev_err(&data->client->dev, "failed to reset interrupts\n");
583out:
584 mutex_unlock(&data->lock);
585
586 return IRQ_HANDLED;
587}
588
589static int stk3310_probe(struct i2c_client *client)
590{
591 int ret;
592 struct iio_dev *indio_dev;
593 struct stk3310_data *data;
594
595 indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data));
596 if (!indio_dev) {
597 dev_err(&client->dev, "iio allocation failed!\n");
598 return -ENOMEM;
599 }
600
601 data = iio_priv(indio_dev);
602 data->client = client;
603 i2c_set_clientdata(client, indio_dev);
604
605 device_property_read_u32(&client->dev, "proximity-near-level",
606 &data->ps_near_level);
607
608 mutex_init(&data->lock);
609
610 ret = stk3310_regmap_init(data);
611 if (ret < 0)
612 return ret;
613
614 indio_dev->info = &stk3310_info;
615 indio_dev->name = STK3310_DRIVER_NAME;
616 indio_dev->modes = INDIO_DIRECT_MODE;
617 indio_dev->channels = stk3310_channels;
618 indio_dev->num_channels = ARRAY_SIZE(stk3310_channels);
619
620 ret = stk3310_init(indio_dev);
621 if (ret < 0)
622 return ret;
623
624 if (client->irq > 0) {
625 ret = devm_request_threaded_irq(&client->dev, client->irq,
626 stk3310_irq_handler,
627 stk3310_irq_event_handler,
628 IRQF_TRIGGER_FALLING |
629 IRQF_ONESHOT,
630 STK3310_EVENT, indio_dev);
631 if (ret < 0) {
632 dev_err(&client->dev, "request irq %d failed\n",
633 client->irq);
634 goto err_standby;
635 }
636 }
637
638 ret = iio_device_register(indio_dev);
639 if (ret < 0) {
640 dev_err(&client->dev, "device_register failed\n");
641 goto err_standby;
642 }
643
644 return 0;
645
646err_standby:
647 stk3310_set_state(data, STK3310_STATE_STANDBY);
648 return ret;
649}
650
651static void stk3310_remove(struct i2c_client *client)
652{
653 struct iio_dev *indio_dev = i2c_get_clientdata(client);
654
655 iio_device_unregister(indio_dev);
656 stk3310_set_state(iio_priv(indio_dev), STK3310_STATE_STANDBY);
657}
658
659static int stk3310_suspend(struct device *dev)
660{
661 struct stk3310_data *data;
662
663 data = iio_priv(i2c_get_clientdata(to_i2c_client(dev)));
664
665 return stk3310_set_state(data, STK3310_STATE_STANDBY);
666}
667
668static int stk3310_resume(struct device *dev)
669{
670 u8 state = 0;
671 struct stk3310_data *data;
672
673 data = iio_priv(i2c_get_clientdata(to_i2c_client(dev)));
674 if (data->ps_enabled)
675 state |= STK3310_STATE_EN_PS;
676 if (data->als_enabled)
677 state |= STK3310_STATE_EN_ALS;
678
679 return stk3310_set_state(data, state);
680}
681
682static DEFINE_SIMPLE_DEV_PM_OPS(stk3310_pm_ops, stk3310_suspend,
683 stk3310_resume);
684
685static const struct i2c_device_id stk3310_i2c_id[] = {
686 {"STK3310", 0},
687 {"STK3311", 0},
688 {"STK3335", 0},
689 {}
690};
691MODULE_DEVICE_TABLE(i2c, stk3310_i2c_id);
692
693static const struct acpi_device_id stk3310_acpi_id[] = {
694 {"STK3310", 0},
695 {"STK3311", 0},
696 {"STK3335", 0},
697 {}
698};
699
700MODULE_DEVICE_TABLE(acpi, stk3310_acpi_id);
701
702static const struct of_device_id stk3310_of_match[] = {
703 { .compatible = "sensortek,stk3310", },
704 { .compatible = "sensortek,stk3311", },
705 { .compatible = "sensortek,stk3335", },
706 {}
707};
708MODULE_DEVICE_TABLE(of, stk3310_of_match);
709
710static struct i2c_driver stk3310_driver = {
711 .driver = {
712 .name = "stk3310",
713 .of_match_table = stk3310_of_match,
714 .pm = pm_sleep_ptr(&stk3310_pm_ops),
715 .acpi_match_table = ACPI_PTR(stk3310_acpi_id),
716 },
717 .probe = stk3310_probe,
718 .remove = stk3310_remove,
719 .id_table = stk3310_i2c_id,
720};
721
722module_i2c_driver(stk3310_driver);
723
724MODULE_AUTHOR("Tiberiu Breana <tiberiu.a.breana@intel.com>");
725MODULE_DESCRIPTION("STK3310 Ambient Light and Proximity Sensor driver");
726MODULE_LICENSE("GPL v2");