xref: /openbmc/linux/drivers/iio/light/stk3310.c (revision 7cf15f42)
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 
67 static const struct reg_field stk3310_reg_field_state =
68 				REG_FIELD(STK3310_REG_STATE, 0, 2);
69 static const struct reg_field stk3310_reg_field_als_gain =
70 				REG_FIELD(STK3310_REG_ALSCTRL, 4, 5);
71 static const struct reg_field stk3310_reg_field_ps_gain =
72 				REG_FIELD(STK3310_REG_PSCTRL, 4, 5);
73 static const struct reg_field stk3310_reg_field_als_it =
74 				REG_FIELD(STK3310_REG_ALSCTRL, 0, 3);
75 static const struct reg_field stk3310_reg_field_ps_it =
76 				REG_FIELD(STK3310_REG_PSCTRL, 0, 3);
77 static const struct reg_field stk3310_reg_field_int_ps =
78 				REG_FIELD(STK3310_REG_INT, 0, 2);
79 static const struct reg_field stk3310_reg_field_flag_psint =
80 				REG_FIELD(STK3310_REG_FLAG, 4, 4);
81 static 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. */
85 static 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 
92 static const int stk3310_scale_table[][2] = {
93 	{6, 400000}, {1, 600000}, {0, 400000}, {0, 100000}
94 };
95 
96 /* Integration time in seconds, microseconds */
97 static 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 
104 struct 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 
122 static 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 
stk3310_read_near_level(struct iio_dev * indio_dev,uintptr_t priv,const struct iio_chan_spec * chan,char * buf)139 static 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 
149 static 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 
158 static 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 
178 static IIO_CONST_ATTR(in_illuminance_scale_available, STK3310_SCALE_AVAILABLE);
179 
180 static IIO_CONST_ATTR(in_proximity_scale_available, STK3310_SCALE_AVAILABLE);
181 
182 static IIO_CONST_ATTR(in_illuminance_integration_time_available,
183 		      STK3310_IT_AVAILABLE);
184 
185 static IIO_CONST_ATTR(in_proximity_integration_time_available,
186 		      STK3310_IT_AVAILABLE);
187 
188 static 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 
196 static const struct attribute_group stk3310_attribute_group = {
197 	.attrs = stk3310_attributes
198 };
199 
stk3310_get_index(const int table[][2],int table_size,int val,int val2)200 static 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 
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)213 static 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 
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)248 static 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 
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)284 static 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 
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)300 static 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 
stk3310_read_raw(struct iio_dev * indio_dev,struct iio_chan_spec const * chan,int * val,int * val2,long mask)323 static 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 
stk3310_write_raw(struct iio_dev * indio_dev,struct iio_chan_spec const * chan,int val,int val2,long mask)381 static 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 
431 static 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 
stk3310_set_state(struct stk3310_data * data,u8 state)441 static 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 
stk3310_init(struct iio_dev * indio_dev)464 static 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 
stk3310_is_volatile_reg(struct device * dev,unsigned int reg)499 static 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 
513 static 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 
stk3310_regmap_init(struct stk3310_data * data)522 static 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 
stk3310_irq_handler(int irq,void * private)547 static 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 
stk3310_irq_event_handler(int irq,void * private)557 static 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");
583 out:
584 	mutex_unlock(&data->lock);
585 
586 	return IRQ_HANDLED;
587 }
588 
stk3310_probe(struct i2c_client * client)589 static 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 
646 err_standby:
647 	stk3310_set_state(data, STK3310_STATE_STANDBY);
648 	return ret;
649 }
650 
stk3310_remove(struct i2c_client * client)651 static 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 
stk3310_suspend(struct device * dev)659 static 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 
stk3310_resume(struct device * dev)668 static 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 
682 static DEFINE_SIMPLE_DEV_PM_OPS(stk3310_pm_ops, stk3310_suspend,
683 				stk3310_resume);
684 
685 static const struct i2c_device_id stk3310_i2c_id[] = {
686 	{"STK3310", 0},
687 	{"STK3311", 0},
688 	{"STK3335", 0},
689 	{}
690 };
691 MODULE_DEVICE_TABLE(i2c, stk3310_i2c_id);
692 
693 static const struct acpi_device_id stk3310_acpi_id[] = {
694 	{"STK3310", 0},
695 	{"STK3311", 0},
696 	{"STK3335", 0},
697 	{}
698 };
699 
700 MODULE_DEVICE_TABLE(acpi, stk3310_acpi_id);
701 
702 static const struct of_device_id stk3310_of_match[] = {
703 	{ .compatible = "sensortek,stk3310", },
704 	{ .compatible = "sensortek,stk3311", },
705 	{ .compatible = "sensortek,stk3335", },
706 	{}
707 };
708 MODULE_DEVICE_TABLE(of, stk3310_of_match);
709 
710 static 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 
722 module_i2c_driver(stk3310_driver);
723 
724 MODULE_AUTHOR("Tiberiu Breana <tiberiu.a.breana@intel.com>");
725 MODULE_DESCRIPTION("STK3310 Ambient Light and Proximity Sensor driver");
726 MODULE_LICENSE("GPL v2");
727