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
70 static const struct reg_field stk3310_reg_field_state =
71 REG_FIELD(STK3310_REG_STATE, 0, 2);
72 static const struct reg_field stk3310_reg_field_als_gain =
73 REG_FIELD(STK3310_REG_ALSCTRL, 4, 5);
74 static const struct reg_field stk3310_reg_field_ps_gain =
75 REG_FIELD(STK3310_REG_PSCTRL, 4, 5);
76 static const struct reg_field stk3310_reg_field_als_it =
77 REG_FIELD(STK3310_REG_ALSCTRL, 0, 3);
78 static const struct reg_field stk3310_reg_field_ps_it =
79 REG_FIELD(STK3310_REG_PSCTRL, 0, 3);
80 static const struct reg_field stk3310_reg_field_int_ps =
81 REG_FIELD(STK3310_REG_INT, 0, 2);
82 static const struct reg_field stk3310_reg_field_flag_psint =
83 REG_FIELD(STK3310_REG_FLAG, 4, 4);
84 static const struct reg_field stk3310_reg_field_flag_nf =
85 REG_FIELD(STK3310_REG_FLAG, 0, 0);
86
87 static 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. */
98 static 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
105 static const int stk3310_scale_table[][2] = {
106 {6, 400000}, {1, 600000}, {0, 400000}, {0, 100000}
107 };
108
109 /* Integration time in seconds, microseconds */
110 static 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
117 struct 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
135 static 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
stk3310_read_near_level(struct iio_dev * indio_dev,uintptr_t priv,const struct iio_chan_spec * chan,char * buf)152 static 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
162 static 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
171 static 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
191 static IIO_CONST_ATTR(in_illuminance_scale_available, STK3310_SCALE_AVAILABLE);
192
193 static IIO_CONST_ATTR(in_proximity_scale_available, STK3310_SCALE_AVAILABLE);
194
195 static IIO_CONST_ATTR(in_illuminance_integration_time_available,
196 STK3310_IT_AVAILABLE);
197
198 static IIO_CONST_ATTR(in_proximity_integration_time_available,
199 STK3310_IT_AVAILABLE);
200
201 static 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
209 static const struct attribute_group stk3310_attribute_group = {
210 .attrs = stk3310_attributes
211 };
212
stk3310_check_chip_id(const u8 chip_id)213 static 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
stk3310_get_index(const int table[][2],int table_size,int val,int val2)223 static 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
stk3310_read_event(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)236 static 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
stk3310_write_event(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)271 static 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
stk3310_read_event_config(struct iio_dev * indio_dev,const struct iio_chan_spec * chan,enum iio_event_type type,enum iio_event_direction dir)307 static 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
stk3310_write_event_config(struct iio_dev * indio_dev,const struct iio_chan_spec * chan,enum iio_event_type type,enum iio_event_direction dir,int state)323 static 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 int state)
328 {
329 int ret;
330 struct stk3310_data *data = iio_priv(indio_dev);
331 struct i2c_client *client = data->client;
332
333 if (state < 0 || state > 7)
334 return -EINVAL;
335
336 /* Set INT_PS value */
337 mutex_lock(&data->lock);
338 ret = regmap_field_write(data->reg_int_ps, state);
339 if (ret < 0)
340 dev_err(&client->dev, "failed to set interrupt mode\n");
341 mutex_unlock(&data->lock);
342
343 return ret;
344 }
345
stk3310_read_raw(struct iio_dev * indio_dev,struct iio_chan_spec const * chan,int * val,int * val2,long mask)346 static int stk3310_read_raw(struct iio_dev *indio_dev,
347 struct iio_chan_spec const *chan,
348 int *val, int *val2, long mask)
349 {
350 u8 reg;
351 __be16 buf;
352 int ret;
353 unsigned int index;
354 struct stk3310_data *data = iio_priv(indio_dev);
355 struct i2c_client *client = data->client;
356
357 if (chan->type != IIO_LIGHT && chan->type != IIO_PROXIMITY)
358 return -EINVAL;
359
360 switch (mask) {
361 case IIO_CHAN_INFO_RAW:
362 if (chan->type == IIO_LIGHT)
363 reg = STK3310_REG_ALS_DATA_MSB;
364 else
365 reg = STK3310_REG_PS_DATA_MSB;
366
367 mutex_lock(&data->lock);
368 ret = regmap_bulk_read(data->regmap, reg, &buf, 2);
369 if (ret < 0) {
370 dev_err(&client->dev, "register read failed\n");
371 mutex_unlock(&data->lock);
372 return ret;
373 }
374 *val = be16_to_cpu(buf);
375 mutex_unlock(&data->lock);
376 return IIO_VAL_INT;
377 case IIO_CHAN_INFO_INT_TIME:
378 if (chan->type == IIO_LIGHT)
379 ret = regmap_field_read(data->reg_als_it, &index);
380 else
381 ret = regmap_field_read(data->reg_ps_it, &index);
382 if (ret < 0)
383 return ret;
384
385 *val = stk3310_it_table[index][0];
386 *val2 = stk3310_it_table[index][1];
387 return IIO_VAL_INT_PLUS_MICRO;
388 case IIO_CHAN_INFO_SCALE:
389 if (chan->type == IIO_LIGHT)
390 ret = regmap_field_read(data->reg_als_gain, &index);
391 else
392 ret = regmap_field_read(data->reg_ps_gain, &index);
393 if (ret < 0)
394 return ret;
395
396 *val = stk3310_scale_table[index][0];
397 *val2 = stk3310_scale_table[index][1];
398 return IIO_VAL_INT_PLUS_MICRO;
399 }
400
401 return -EINVAL;
402 }
403
stk3310_write_raw(struct iio_dev * indio_dev,struct iio_chan_spec const * chan,int val,int val2,long mask)404 static int stk3310_write_raw(struct iio_dev *indio_dev,
405 struct iio_chan_spec const *chan,
406 int val, int val2, long mask)
407 {
408 int ret;
409 int index;
410 struct stk3310_data *data = iio_priv(indio_dev);
411
412 if (chan->type != IIO_LIGHT && chan->type != IIO_PROXIMITY)
413 return -EINVAL;
414
415 switch (mask) {
416 case IIO_CHAN_INFO_INT_TIME:
417 index = stk3310_get_index(stk3310_it_table,
418 ARRAY_SIZE(stk3310_it_table),
419 val, val2);
420 if (index < 0)
421 return -EINVAL;
422 mutex_lock(&data->lock);
423 if (chan->type == IIO_LIGHT)
424 ret = regmap_field_write(data->reg_als_it, index);
425 else
426 ret = regmap_field_write(data->reg_ps_it, index);
427 if (ret < 0)
428 dev_err(&data->client->dev,
429 "sensor configuration failed\n");
430 mutex_unlock(&data->lock);
431 return ret;
432
433 case IIO_CHAN_INFO_SCALE:
434 index = stk3310_get_index(stk3310_scale_table,
435 ARRAY_SIZE(stk3310_scale_table),
436 val, val2);
437 if (index < 0)
438 return -EINVAL;
439 mutex_lock(&data->lock);
440 if (chan->type == IIO_LIGHT)
441 ret = regmap_field_write(data->reg_als_gain, index);
442 else
443 ret = regmap_field_write(data->reg_ps_gain, index);
444 if (ret < 0)
445 dev_err(&data->client->dev,
446 "sensor configuration failed\n");
447 mutex_unlock(&data->lock);
448 return ret;
449 }
450
451 return -EINVAL;
452 }
453
454 static const struct iio_info stk3310_info = {
455 .read_raw = stk3310_read_raw,
456 .write_raw = stk3310_write_raw,
457 .attrs = &stk3310_attribute_group,
458 .read_event_value = stk3310_read_event,
459 .write_event_value = stk3310_write_event,
460 .read_event_config = stk3310_read_event_config,
461 .write_event_config = stk3310_write_event_config,
462 };
463
stk3310_set_state(struct stk3310_data * data,u8 state)464 static int stk3310_set_state(struct stk3310_data *data, u8 state)
465 {
466 int ret;
467 struct i2c_client *client = data->client;
468
469 /* 3-bit state; 0b100 is not supported. */
470 if (state > 7 || state == 4)
471 return -EINVAL;
472
473 mutex_lock(&data->lock);
474 ret = regmap_field_write(data->reg_state, state);
475 if (ret < 0) {
476 dev_err(&client->dev, "failed to change sensor state\n");
477 } else if (state != STK3310_STATE_STANDBY) {
478 /* Don't reset the 'enabled' flags if we're going in standby */
479 data->ps_enabled = !!(state & STK3310_STATE_EN_PS);
480 data->als_enabled = !!(state & STK3310_STATE_EN_ALS);
481 }
482 mutex_unlock(&data->lock);
483
484 return ret;
485 }
486
stk3310_init(struct iio_dev * indio_dev)487 static int stk3310_init(struct iio_dev *indio_dev)
488 {
489 int ret;
490 int chipid;
491 u8 state;
492 struct stk3310_data *data = iio_priv(indio_dev);
493 struct i2c_client *client = data->client;
494
495 ret = regmap_read(data->regmap, STK3310_REG_ID, &chipid);
496 if (ret < 0)
497 return ret;
498
499 ret = stk3310_check_chip_id(chipid);
500 if (ret < 0)
501 dev_info(&client->dev, "new unknown chip id: 0x%x\n", chipid);
502
503 state = STK3310_STATE_EN_ALS | STK3310_STATE_EN_PS;
504 ret = stk3310_set_state(data, state);
505 if (ret < 0) {
506 dev_err(&client->dev, "failed to enable sensor");
507 return ret;
508 }
509
510 /* Enable PS interrupts */
511 ret = regmap_field_write(data->reg_int_ps, STK3310_PSINT_EN);
512 if (ret < 0)
513 dev_err(&client->dev, "failed to enable interrupts!\n");
514
515 return ret;
516 }
517
stk3310_is_volatile_reg(struct device * dev,unsigned int reg)518 static bool stk3310_is_volatile_reg(struct device *dev, unsigned int reg)
519 {
520 switch (reg) {
521 case STK3310_REG_ALS_DATA_MSB:
522 case STK3310_REG_ALS_DATA_LSB:
523 case STK3310_REG_PS_DATA_LSB:
524 case STK3310_REG_PS_DATA_MSB:
525 case STK3310_REG_FLAG:
526 return true;
527 default:
528 return false;
529 }
530 }
531
532 static const struct regmap_config stk3310_regmap_config = {
533 .name = STK3310_REGMAP_NAME,
534 .reg_bits = 8,
535 .val_bits = 8,
536 .max_register = STK3310_MAX_REG,
537 .cache_type = REGCACHE_RBTREE,
538 .volatile_reg = stk3310_is_volatile_reg,
539 };
540
stk3310_regmap_init(struct stk3310_data * data)541 static int stk3310_regmap_init(struct stk3310_data *data)
542 {
543 struct regmap *regmap;
544 struct i2c_client *client;
545
546 client = data->client;
547 regmap = devm_regmap_init_i2c(client, &stk3310_regmap_config);
548 if (IS_ERR(regmap)) {
549 dev_err(&client->dev, "regmap initialization failed.\n");
550 return PTR_ERR(regmap);
551 }
552 data->regmap = regmap;
553
554 STK3310_REGFIELD(state);
555 STK3310_REGFIELD(als_gain);
556 STK3310_REGFIELD(ps_gain);
557 STK3310_REGFIELD(als_it);
558 STK3310_REGFIELD(ps_it);
559 STK3310_REGFIELD(int_ps);
560 STK3310_REGFIELD(flag_psint);
561 STK3310_REGFIELD(flag_nf);
562
563 return 0;
564 }
565
stk3310_irq_handler(int irq,void * private)566 static irqreturn_t stk3310_irq_handler(int irq, void *private)
567 {
568 struct iio_dev *indio_dev = private;
569 struct stk3310_data *data = iio_priv(indio_dev);
570
571 data->timestamp = iio_get_time_ns(indio_dev);
572
573 return IRQ_WAKE_THREAD;
574 }
575
stk3310_irq_event_handler(int irq,void * private)576 static irqreturn_t stk3310_irq_event_handler(int irq, void *private)
577 {
578 int ret;
579 unsigned int dir;
580 u64 event;
581
582 struct iio_dev *indio_dev = private;
583 struct stk3310_data *data = iio_priv(indio_dev);
584
585 /* Read FLAG_NF to figure out what threshold has been met. */
586 mutex_lock(&data->lock);
587 ret = regmap_field_read(data->reg_flag_nf, &dir);
588 if (ret < 0) {
589 dev_err(&data->client->dev, "register read failed: %d\n", ret);
590 goto out;
591 }
592 event = IIO_UNMOD_EVENT_CODE(IIO_PROXIMITY, 1,
593 IIO_EV_TYPE_THRESH,
594 (dir ? IIO_EV_DIR_FALLING :
595 IIO_EV_DIR_RISING));
596 iio_push_event(indio_dev, event, data->timestamp);
597
598 /* Reset the interrupt flag */
599 ret = regmap_field_write(data->reg_flag_psint, 0);
600 if (ret < 0)
601 dev_err(&data->client->dev, "failed to reset interrupts\n");
602 out:
603 mutex_unlock(&data->lock);
604
605 return IRQ_HANDLED;
606 }
607
stk3310_probe(struct i2c_client * client)608 static int stk3310_probe(struct i2c_client *client)
609 {
610 int ret;
611 struct iio_dev *indio_dev;
612 struct stk3310_data *data;
613
614 indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data));
615 if (!indio_dev) {
616 dev_err(&client->dev, "iio allocation failed!\n");
617 return -ENOMEM;
618 }
619
620 data = iio_priv(indio_dev);
621 data->client = client;
622 i2c_set_clientdata(client, indio_dev);
623
624 device_property_read_u32(&client->dev, "proximity-near-level",
625 &data->ps_near_level);
626
627 mutex_init(&data->lock);
628
629 ret = stk3310_regmap_init(data);
630 if (ret < 0)
631 return ret;
632
633 indio_dev->info = &stk3310_info;
634 indio_dev->name = STK3310_DRIVER_NAME;
635 indio_dev->modes = INDIO_DIRECT_MODE;
636 indio_dev->channels = stk3310_channels;
637 indio_dev->num_channels = ARRAY_SIZE(stk3310_channels);
638
639 ret = stk3310_init(indio_dev);
640 if (ret < 0)
641 return ret;
642
643 if (client->irq > 0) {
644 ret = devm_request_threaded_irq(&client->dev, client->irq,
645 stk3310_irq_handler,
646 stk3310_irq_event_handler,
647 IRQF_TRIGGER_FALLING |
648 IRQF_ONESHOT,
649 STK3310_EVENT, indio_dev);
650 if (ret < 0) {
651 dev_err(&client->dev, "request irq %d failed\n",
652 client->irq);
653 goto err_standby;
654 }
655 }
656
657 ret = iio_device_register(indio_dev);
658 if (ret < 0) {
659 dev_err(&client->dev, "device_register failed\n");
660 goto err_standby;
661 }
662
663 return 0;
664
665 err_standby:
666 stk3310_set_state(data, STK3310_STATE_STANDBY);
667 return ret;
668 }
669
stk3310_remove(struct i2c_client * client)670 static void stk3310_remove(struct i2c_client *client)
671 {
672 struct iio_dev *indio_dev = i2c_get_clientdata(client);
673
674 iio_device_unregister(indio_dev);
675 stk3310_set_state(iio_priv(indio_dev), STK3310_STATE_STANDBY);
676 }
677
stk3310_suspend(struct device * dev)678 static int stk3310_suspend(struct device *dev)
679 {
680 struct stk3310_data *data;
681
682 data = iio_priv(i2c_get_clientdata(to_i2c_client(dev)));
683
684 return stk3310_set_state(data, STK3310_STATE_STANDBY);
685 }
686
stk3310_resume(struct device * dev)687 static int stk3310_resume(struct device *dev)
688 {
689 u8 state = 0;
690 struct stk3310_data *data;
691
692 data = iio_priv(i2c_get_clientdata(to_i2c_client(dev)));
693 if (data->ps_enabled)
694 state |= STK3310_STATE_EN_PS;
695 if (data->als_enabled)
696 state |= STK3310_STATE_EN_ALS;
697
698 return stk3310_set_state(data, state);
699 }
700
701 static DEFINE_SIMPLE_DEV_PM_OPS(stk3310_pm_ops, stk3310_suspend,
702 stk3310_resume);
703
704 static const struct i2c_device_id stk3310_i2c_id[] = {
705 { "STK3013" },
706 { "STK3310" },
707 { "STK3311" },
708 { "STK3335" },
709 {}
710 };
711 MODULE_DEVICE_TABLE(i2c, stk3310_i2c_id);
712
713 static const struct acpi_device_id stk3310_acpi_id[] = {
714 {"STK3013", 0},
715 {"STK3310", 0},
716 {"STK3311", 0},
717 {}
718 };
719
720 MODULE_DEVICE_TABLE(acpi, stk3310_acpi_id);
721
722 static const struct of_device_id stk3310_of_match[] = {
723 { .compatible = "sensortek,stk3013", },
724 { .compatible = "sensortek,stk3310", },
725 { .compatible = "sensortek,stk3311", },
726 { .compatible = "sensortek,stk3335", },
727 {}
728 };
729 MODULE_DEVICE_TABLE(of, stk3310_of_match);
730
731 static struct i2c_driver stk3310_driver = {
732 .driver = {
733 .name = "stk3310",
734 .of_match_table = stk3310_of_match,
735 .pm = pm_sleep_ptr(&stk3310_pm_ops),
736 .acpi_match_table = stk3310_acpi_id,
737 },
738 .probe = stk3310_probe,
739 .remove = stk3310_remove,
740 .id_table = stk3310_i2c_id,
741 };
742
743 module_i2c_driver(stk3310_driver);
744
745 MODULE_AUTHOR("Tiberiu Breana <tiberiu.a.breana@intel.com>");
746 MODULE_DESCRIPTION("STK3310 Ambient Light and Proximity Sensor driver");
747 MODULE_LICENSE("GPL v2");
748