xref: /openbmc/linux/drivers/iio/light/rpr0521.c (revision 7cf15f42)
1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3  * RPR-0521 ROHM Ambient Light and Proximity Sensor
4  *
5  * Copyright (c) 2015, Intel Corporation.
6  *
7  * IIO driver for RPR-0521RS (7-bit I2C slave address 0x38).
8  *
9  * TODO: illuminance channel
10  */
11 
12 #include <linux/module.h>
13 #include <linux/init.h>
14 #include <linux/i2c.h>
15 #include <linux/regmap.h>
16 #include <linux/delay.h>
17 #include <linux/acpi.h>
18 
19 #include <linux/iio/iio.h>
20 #include <linux/iio/buffer.h>
21 #include <linux/iio/trigger.h>
22 #include <linux/iio/trigger_consumer.h>
23 #include <linux/iio/triggered_buffer.h>
24 #include <linux/iio/sysfs.h>
25 #include <linux/pm_runtime.h>
26 
27 #define RPR0521_REG_SYSTEM_CTRL		0x40
28 #define RPR0521_REG_MODE_CTRL		0x41
29 #define RPR0521_REG_ALS_CTRL		0x42
30 #define RPR0521_REG_PXS_CTRL		0x43
31 #define RPR0521_REG_PXS_DATA		0x44 /* 16-bit, little endian */
32 #define RPR0521_REG_ALS_DATA0		0x46 /* 16-bit, little endian */
33 #define RPR0521_REG_ALS_DATA1		0x48 /* 16-bit, little endian */
34 #define RPR0521_REG_INTERRUPT		0x4A
35 #define RPR0521_REG_PS_OFFSET_LSB	0x53
36 #define RPR0521_REG_ID			0x92
37 
38 #define RPR0521_MODE_ALS_MASK		BIT(7)
39 #define RPR0521_MODE_PXS_MASK		BIT(6)
40 #define RPR0521_MODE_MEAS_TIME_MASK	GENMASK(3, 0)
41 #define RPR0521_ALS_DATA0_GAIN_MASK	GENMASK(5, 4)
42 #define RPR0521_ALS_DATA0_GAIN_SHIFT	4
43 #define RPR0521_ALS_DATA1_GAIN_MASK	GENMASK(3, 2)
44 #define RPR0521_ALS_DATA1_GAIN_SHIFT	2
45 #define RPR0521_PXS_GAIN_MASK		GENMASK(5, 4)
46 #define RPR0521_PXS_GAIN_SHIFT		4
47 #define RPR0521_PXS_PERSISTENCE_MASK	GENMASK(3, 0)
48 #define RPR0521_INTERRUPT_INT_TRIG_PS_MASK	BIT(0)
49 #define RPR0521_INTERRUPT_INT_TRIG_ALS_MASK	BIT(1)
50 #define RPR0521_INTERRUPT_INT_REASSERT_MASK	BIT(3)
51 #define RPR0521_INTERRUPT_ALS_INT_STATUS_MASK	BIT(6)
52 #define RPR0521_INTERRUPT_PS_INT_STATUS_MASK	BIT(7)
53 
54 #define RPR0521_MODE_ALS_ENABLE		BIT(7)
55 #define RPR0521_MODE_ALS_DISABLE	0x00
56 #define RPR0521_MODE_PXS_ENABLE		BIT(6)
57 #define RPR0521_MODE_PXS_DISABLE	0x00
58 #define RPR0521_PXS_PERSISTENCE_DRDY	0x00
59 
60 #define RPR0521_INTERRUPT_INT_TRIG_PS_ENABLE	BIT(0)
61 #define RPR0521_INTERRUPT_INT_TRIG_PS_DISABLE	0x00
62 #define RPR0521_INTERRUPT_INT_TRIG_ALS_ENABLE	BIT(1)
63 #define RPR0521_INTERRUPT_INT_TRIG_ALS_DISABLE	0x00
64 #define RPR0521_INTERRUPT_INT_REASSERT_ENABLE	BIT(3)
65 #define RPR0521_INTERRUPT_INT_REASSERT_DISABLE	0x00
66 
67 #define RPR0521_MANUFACT_ID		0xE0
68 #define RPR0521_DEFAULT_MEAS_TIME	0x06 /* ALS - 100ms, PXS - 100ms */
69 
70 #define RPR0521_DRV_NAME		"RPR0521"
71 #define RPR0521_IRQ_NAME		"rpr0521_event"
72 #define RPR0521_REGMAP_NAME		"rpr0521_regmap"
73 
74 #define RPR0521_SLEEP_DELAY_MS	2000
75 
76 #define RPR0521_ALS_SCALE_AVAIL "0.007812 0.015625 0.5 1"
77 #define RPR0521_PXS_SCALE_AVAIL "0.125 0.5 1"
78 
79 struct rpr0521_gain {
80 	int scale;
81 	int uscale;
82 };
83 
84 static const struct rpr0521_gain rpr0521_als_gain[4] = {
85 	{1, 0},		/* x1 */
86 	{0, 500000},	/* x2 */
87 	{0, 15625},	/* x64 */
88 	{0, 7812},	/* x128 */
89 };
90 
91 static const struct rpr0521_gain rpr0521_pxs_gain[3] = {
92 	{1, 0},		/* x1 */
93 	{0, 500000},	/* x2 */
94 	{0, 125000},	/* x4 */
95 };
96 
97 enum rpr0521_channel {
98 	RPR0521_CHAN_PXS,
99 	RPR0521_CHAN_ALS_DATA0,
100 	RPR0521_CHAN_ALS_DATA1,
101 };
102 
103 struct rpr0521_reg_desc {
104 	u8 address;
105 	u8 device_mask;
106 };
107 
108 static const struct rpr0521_reg_desc rpr0521_data_reg[] = {
109 	[RPR0521_CHAN_PXS]	= {
110 		.address	= RPR0521_REG_PXS_DATA,
111 		.device_mask	= RPR0521_MODE_PXS_MASK,
112 	},
113 	[RPR0521_CHAN_ALS_DATA0] = {
114 		.address	= RPR0521_REG_ALS_DATA0,
115 		.device_mask	= RPR0521_MODE_ALS_MASK,
116 	},
117 	[RPR0521_CHAN_ALS_DATA1] = {
118 		.address	= RPR0521_REG_ALS_DATA1,
119 		.device_mask	= RPR0521_MODE_ALS_MASK,
120 	},
121 };
122 
123 static const struct rpr0521_gain_info {
124 	u8 reg;
125 	u8 mask;
126 	u8 shift;
127 	const struct rpr0521_gain *gain;
128 	int size;
129 } rpr0521_gain[] = {
130 	[RPR0521_CHAN_PXS] = {
131 		.reg	= RPR0521_REG_PXS_CTRL,
132 		.mask	= RPR0521_PXS_GAIN_MASK,
133 		.shift	= RPR0521_PXS_GAIN_SHIFT,
134 		.gain	= rpr0521_pxs_gain,
135 		.size	= ARRAY_SIZE(rpr0521_pxs_gain),
136 	},
137 	[RPR0521_CHAN_ALS_DATA0] = {
138 		.reg	= RPR0521_REG_ALS_CTRL,
139 		.mask	= RPR0521_ALS_DATA0_GAIN_MASK,
140 		.shift	= RPR0521_ALS_DATA0_GAIN_SHIFT,
141 		.gain	= rpr0521_als_gain,
142 		.size	= ARRAY_SIZE(rpr0521_als_gain),
143 	},
144 	[RPR0521_CHAN_ALS_DATA1] = {
145 		.reg	= RPR0521_REG_ALS_CTRL,
146 		.mask	= RPR0521_ALS_DATA1_GAIN_MASK,
147 		.shift	= RPR0521_ALS_DATA1_GAIN_SHIFT,
148 		.gain	= rpr0521_als_gain,
149 		.size	= ARRAY_SIZE(rpr0521_als_gain),
150 	},
151 };
152 
153 struct rpr0521_samp_freq {
154 	int	als_hz;
155 	int	als_uhz;
156 	int	pxs_hz;
157 	int	pxs_uhz;
158 };
159 
160 static const struct rpr0521_samp_freq rpr0521_samp_freq_i[13] = {
161 /*	{ALS, PXS},		   W==currently writable option */
162 	{0, 0, 0, 0},		/* W0000, 0=standby */
163 	{0, 0, 100, 0},		/*  0001 */
164 	{0, 0, 25, 0},		/*  0010 */
165 	{0, 0, 10, 0},		/*  0011 */
166 	{0, 0, 2, 500000},	/*  0100 */
167 	{10, 0, 20, 0},		/*  0101 */
168 	{10, 0, 10, 0},		/* W0110 */
169 	{10, 0, 2, 500000},	/*  0111 */
170 	{2, 500000, 20, 0},	/*  1000, measurement 100ms, sleep 300ms */
171 	{2, 500000, 10, 0},	/*  1001, measurement 100ms, sleep 300ms */
172 	{2, 500000, 0, 0},	/*  1010, high sensitivity mode */
173 	{2, 500000, 2, 500000},	/* W1011, high sensitivity mode */
174 	{20, 0, 20, 0}	/* 1100, ALS_data x 0.5, see specification P.18 */
175 };
176 
177 struct rpr0521_data {
178 	struct i2c_client *client;
179 
180 	/* protect device params updates (e.g state, gain) */
181 	struct mutex lock;
182 
183 	/* device active status */
184 	bool als_dev_en;
185 	bool pxs_dev_en;
186 
187 	struct iio_trigger *drdy_trigger0;
188 	s64 irq_timestamp;
189 
190 	/* optimize runtime pm ops - enable/disable device only if needed */
191 	bool als_ps_need_en;
192 	bool pxs_ps_need_en;
193 	bool als_need_dis;
194 	bool pxs_need_dis;
195 
196 	struct regmap *regmap;
197 
198 	/*
199 	 * Ensure correct naturally aligned timestamp.
200 	 * Note that the read will put garbage data into
201 	 * the padding but this should not be a problem
202 	 */
203 	struct {
204 		__le16 channels[3];
205 		u8 garbage;
206 		s64 ts __aligned(8);
207 	} scan;
208 };
209 
210 static IIO_CONST_ATTR(in_intensity_scale_available, RPR0521_ALS_SCALE_AVAIL);
211 static IIO_CONST_ATTR(in_proximity_scale_available, RPR0521_PXS_SCALE_AVAIL);
212 
213 /*
214  * Start with easy freq first, whole table of freq combinations is more
215  * complicated.
216  */
217 static IIO_CONST_ATTR_SAMP_FREQ_AVAIL("2.5 10");
218 
219 static struct attribute *rpr0521_attributes[] = {
220 	&iio_const_attr_in_intensity_scale_available.dev_attr.attr,
221 	&iio_const_attr_in_proximity_scale_available.dev_attr.attr,
222 	&iio_const_attr_sampling_frequency_available.dev_attr.attr,
223 	NULL,
224 };
225 
226 static const struct attribute_group rpr0521_attribute_group = {
227 	.attrs = rpr0521_attributes,
228 };
229 
230 /* Order of the channel data in buffer */
231 enum rpr0521_scan_index_order {
232 	RPR0521_CHAN_INDEX_PXS,
233 	RPR0521_CHAN_INDEX_BOTH,
234 	RPR0521_CHAN_INDEX_IR,
235 };
236 
237 static const unsigned long rpr0521_available_scan_masks[] = {
238 	BIT(RPR0521_CHAN_INDEX_PXS) | BIT(RPR0521_CHAN_INDEX_BOTH) |
239 	BIT(RPR0521_CHAN_INDEX_IR),
240 	0
241 };
242 
243 static const struct iio_chan_spec rpr0521_channels[] = {
244 	{
245 		.type = IIO_PROXIMITY,
246 		.address = RPR0521_CHAN_PXS,
247 		.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
248 			BIT(IIO_CHAN_INFO_OFFSET) |
249 			BIT(IIO_CHAN_INFO_SCALE),
250 		.info_mask_shared_by_all = BIT(IIO_CHAN_INFO_SAMP_FREQ),
251 		.scan_index = RPR0521_CHAN_INDEX_PXS,
252 		.scan_type = {
253 			.sign = 'u',
254 			.realbits = 16,
255 			.storagebits = 16,
256 			.endianness = IIO_LE,
257 		},
258 	},
259 	{
260 		.type = IIO_INTENSITY,
261 		.modified = 1,
262 		.address = RPR0521_CHAN_ALS_DATA0,
263 		.channel2 = IIO_MOD_LIGHT_BOTH,
264 		.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
265 			BIT(IIO_CHAN_INFO_SCALE),
266 		.info_mask_shared_by_all = BIT(IIO_CHAN_INFO_SAMP_FREQ),
267 		.scan_index = RPR0521_CHAN_INDEX_BOTH,
268 		.scan_type = {
269 			.sign = 'u',
270 			.realbits = 16,
271 			.storagebits = 16,
272 			.endianness = IIO_LE,
273 		},
274 	},
275 	{
276 		.type = IIO_INTENSITY,
277 		.modified = 1,
278 		.address = RPR0521_CHAN_ALS_DATA1,
279 		.channel2 = IIO_MOD_LIGHT_IR,
280 		.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
281 			BIT(IIO_CHAN_INFO_SCALE),
282 		.info_mask_shared_by_all = BIT(IIO_CHAN_INFO_SAMP_FREQ),
283 		.scan_index = RPR0521_CHAN_INDEX_IR,
284 		.scan_type = {
285 			.sign = 'u',
286 			.realbits = 16,
287 			.storagebits = 16,
288 			.endianness = IIO_LE,
289 		},
290 	},
291 };
292 
rpr0521_als_enable(struct rpr0521_data * data,u8 status)293 static int rpr0521_als_enable(struct rpr0521_data *data, u8 status)
294 {
295 	int ret;
296 
297 	ret = regmap_update_bits(data->regmap, RPR0521_REG_MODE_CTRL,
298 				 RPR0521_MODE_ALS_MASK,
299 				 status);
300 	if (ret < 0)
301 		return ret;
302 
303 	if (status & RPR0521_MODE_ALS_MASK)
304 		data->als_dev_en = true;
305 	else
306 		data->als_dev_en = false;
307 
308 	return 0;
309 }
310 
rpr0521_pxs_enable(struct rpr0521_data * data,u8 status)311 static int rpr0521_pxs_enable(struct rpr0521_data *data, u8 status)
312 {
313 	int ret;
314 
315 	ret = regmap_update_bits(data->regmap, RPR0521_REG_MODE_CTRL,
316 				 RPR0521_MODE_PXS_MASK,
317 				 status);
318 	if (ret < 0)
319 		return ret;
320 
321 	if (status & RPR0521_MODE_PXS_MASK)
322 		data->pxs_dev_en = true;
323 	else
324 		data->pxs_dev_en = false;
325 
326 	return 0;
327 }
328 
329 /**
330  * rpr0521_set_power_state - handles runtime PM state and sensors enabled status
331  *
332  * @data: rpr0521 device private data
333  * @on: state to be set for devices in @device_mask
334  * @device_mask: bitmask specifying for which device we need to update @on state
335  *
336  * Calls for this function must be balanced so that each ON should have matching
337  * OFF. Otherwise pm usage_count gets out of sync.
338  */
rpr0521_set_power_state(struct rpr0521_data * data,bool on,u8 device_mask)339 static int rpr0521_set_power_state(struct rpr0521_data *data, bool on,
340 				   u8 device_mask)
341 {
342 #ifdef CONFIG_PM
343 	int ret;
344 
345 	if (device_mask & RPR0521_MODE_ALS_MASK) {
346 		data->als_ps_need_en = on;
347 		data->als_need_dis = !on;
348 	}
349 
350 	if (device_mask & RPR0521_MODE_PXS_MASK) {
351 		data->pxs_ps_need_en = on;
352 		data->pxs_need_dis = !on;
353 	}
354 
355 	/*
356 	 * On: _resume() is called only when we are suspended
357 	 * Off: _suspend() is called after delay if _resume() is not
358 	 * called before that.
359 	 * Note: If either measurement is re-enabled before _suspend(),
360 	 * both stay enabled until _suspend().
361 	 */
362 	if (on) {
363 		ret = pm_runtime_resume_and_get(&data->client->dev);
364 	} else {
365 		pm_runtime_mark_last_busy(&data->client->dev);
366 		ret = pm_runtime_put_autosuspend(&data->client->dev);
367 	}
368 	if (ret < 0) {
369 		dev_err(&data->client->dev,
370 			"Failed: rpr0521_set_power_state for %d, ret %d\n",
371 			on, ret);
372 		return ret;
373 	}
374 
375 	if (on) {
376 		/* If _resume() was not called, enable measurement now. */
377 		if (data->als_ps_need_en) {
378 			ret = rpr0521_als_enable(data, RPR0521_MODE_ALS_ENABLE);
379 			if (ret)
380 				return ret;
381 			data->als_ps_need_en = false;
382 		}
383 
384 		if (data->pxs_ps_need_en) {
385 			ret = rpr0521_pxs_enable(data, RPR0521_MODE_PXS_ENABLE);
386 			if (ret)
387 				return ret;
388 			data->pxs_ps_need_en = false;
389 		}
390 	}
391 #endif
392 	return 0;
393 }
394 
395 /* Interrupt register tells if this sensor caused the interrupt or not. */
rpr0521_is_triggered(struct rpr0521_data * data)396 static inline bool rpr0521_is_triggered(struct rpr0521_data *data)
397 {
398 	int ret;
399 	int reg;
400 
401 	ret = regmap_read(data->regmap, RPR0521_REG_INTERRUPT, &reg);
402 	if (ret < 0)
403 		return false;   /* Reg read failed. */
404 	if (reg &
405 	    (RPR0521_INTERRUPT_ALS_INT_STATUS_MASK |
406 	    RPR0521_INTERRUPT_PS_INT_STATUS_MASK))
407 		return true;
408 	else
409 		return false;   /* Int not from this sensor. */
410 }
411 
412 /* IRQ to trigger handler */
rpr0521_drdy_irq_handler(int irq,void * private)413 static irqreturn_t rpr0521_drdy_irq_handler(int irq, void *private)
414 {
415 	struct iio_dev *indio_dev = private;
416 	struct rpr0521_data *data = iio_priv(indio_dev);
417 
418 	data->irq_timestamp = iio_get_time_ns(indio_dev);
419 	/*
420 	 * We need to wake the thread to read the interrupt reg. It
421 	 * is not possible to do that here because regmap_read takes a
422 	 * mutex.
423 	 */
424 
425 	return IRQ_WAKE_THREAD;
426 }
427 
rpr0521_drdy_irq_thread(int irq,void * private)428 static irqreturn_t rpr0521_drdy_irq_thread(int irq, void *private)
429 {
430 	struct iio_dev *indio_dev = private;
431 	struct rpr0521_data *data = iio_priv(indio_dev);
432 
433 	if (rpr0521_is_triggered(data)) {
434 		iio_trigger_poll_nested(data->drdy_trigger0);
435 		return IRQ_HANDLED;
436 	}
437 
438 	return IRQ_NONE;
439 }
440 
rpr0521_trigger_consumer_store_time(int irq,void * p)441 static irqreturn_t rpr0521_trigger_consumer_store_time(int irq, void *p)
442 {
443 	struct iio_poll_func *pf = p;
444 	struct iio_dev *indio_dev = pf->indio_dev;
445 
446 	/* Other trigger polls store time here. */
447 	if (!iio_trigger_using_own(indio_dev))
448 		pf->timestamp = iio_get_time_ns(indio_dev);
449 
450 	return IRQ_WAKE_THREAD;
451 }
452 
rpr0521_trigger_consumer_handler(int irq,void * p)453 static irqreturn_t rpr0521_trigger_consumer_handler(int irq, void *p)
454 {
455 	struct iio_poll_func *pf = p;
456 	struct iio_dev *indio_dev = pf->indio_dev;
457 	struct rpr0521_data *data = iio_priv(indio_dev);
458 	int err;
459 
460 	/* Use irq timestamp when reasonable. */
461 	if (iio_trigger_using_own(indio_dev) && data->irq_timestamp) {
462 		pf->timestamp = data->irq_timestamp;
463 		data->irq_timestamp = 0;
464 	}
465 	/* Other chained trigger polls get timestamp only here. */
466 	if (!pf->timestamp)
467 		pf->timestamp = iio_get_time_ns(indio_dev);
468 
469 	err = regmap_bulk_read(data->regmap, RPR0521_REG_PXS_DATA,
470 		data->scan.channels,
471 		(3 * 2) + 1);	/* 3 * 16-bit + (discarded) int clear reg. */
472 	if (!err)
473 		iio_push_to_buffers_with_timestamp(indio_dev,
474 						   &data->scan, pf->timestamp);
475 	else
476 		dev_err(&data->client->dev,
477 			"Trigger consumer can't read from sensor.\n");
478 	pf->timestamp = 0;
479 
480 	iio_trigger_notify_done(indio_dev->trig);
481 
482 	return IRQ_HANDLED;
483 }
484 
rpr0521_write_int_enable(struct rpr0521_data * data)485 static int rpr0521_write_int_enable(struct rpr0521_data *data)
486 {
487 	int err;
488 
489 	/* Interrupt after each measurement */
490 	err = regmap_update_bits(data->regmap, RPR0521_REG_PXS_CTRL,
491 		RPR0521_PXS_PERSISTENCE_MASK,
492 		RPR0521_PXS_PERSISTENCE_DRDY);
493 	if (err) {
494 		dev_err(&data->client->dev, "PS control reg write fail.\n");
495 		return -EBUSY;
496 		}
497 
498 	/* Ignore latch and mode because of drdy */
499 	err = regmap_write(data->regmap, RPR0521_REG_INTERRUPT,
500 		RPR0521_INTERRUPT_INT_REASSERT_DISABLE |
501 		RPR0521_INTERRUPT_INT_TRIG_ALS_DISABLE |
502 		RPR0521_INTERRUPT_INT_TRIG_PS_ENABLE
503 		);
504 	if (err) {
505 		dev_err(&data->client->dev, "Interrupt setup write fail.\n");
506 		return -EBUSY;
507 		}
508 
509 	return 0;
510 }
511 
rpr0521_write_int_disable(struct rpr0521_data * data)512 static int rpr0521_write_int_disable(struct rpr0521_data *data)
513 {
514 	/* Don't care of clearing mode, assert and latch. */
515 	return regmap_write(data->regmap, RPR0521_REG_INTERRUPT,
516 				RPR0521_INTERRUPT_INT_TRIG_ALS_DISABLE |
517 				RPR0521_INTERRUPT_INT_TRIG_PS_DISABLE
518 				);
519 }
520 
521 /*
522  * Trigger producer enable / disable. Note that there will be trigs only when
523  * measurement data is ready to be read.
524  */
rpr0521_pxs_drdy_set_state(struct iio_trigger * trigger,bool enable_drdy)525 static int rpr0521_pxs_drdy_set_state(struct iio_trigger *trigger,
526 	bool enable_drdy)
527 {
528 	struct iio_dev *indio_dev = iio_trigger_get_drvdata(trigger);
529 	struct rpr0521_data *data = iio_priv(indio_dev);
530 	int err;
531 
532 	if (enable_drdy)
533 		err = rpr0521_write_int_enable(data);
534 	else
535 		err = rpr0521_write_int_disable(data);
536 	if (err)
537 		dev_err(&data->client->dev, "rpr0521_pxs_drdy_set_state failed\n");
538 
539 	return err;
540 }
541 
542 static const struct iio_trigger_ops rpr0521_trigger_ops = {
543 	.set_trigger_state = rpr0521_pxs_drdy_set_state,
544 	};
545 
546 
rpr0521_buffer_preenable(struct iio_dev * indio_dev)547 static int rpr0521_buffer_preenable(struct iio_dev *indio_dev)
548 {
549 	int err;
550 	struct rpr0521_data *data = iio_priv(indio_dev);
551 
552 	mutex_lock(&data->lock);
553 	err = rpr0521_set_power_state(data, true,
554 		(RPR0521_MODE_PXS_MASK | RPR0521_MODE_ALS_MASK));
555 	mutex_unlock(&data->lock);
556 	if (err)
557 		dev_err(&data->client->dev, "_buffer_preenable fail\n");
558 
559 	return err;
560 }
561 
rpr0521_buffer_postdisable(struct iio_dev * indio_dev)562 static int rpr0521_buffer_postdisable(struct iio_dev *indio_dev)
563 {
564 	int err;
565 	struct rpr0521_data *data = iio_priv(indio_dev);
566 
567 	mutex_lock(&data->lock);
568 	err = rpr0521_set_power_state(data, false,
569 		(RPR0521_MODE_PXS_MASK | RPR0521_MODE_ALS_MASK));
570 	mutex_unlock(&data->lock);
571 	if (err)
572 		dev_err(&data->client->dev, "_buffer_postdisable fail\n");
573 
574 	return err;
575 }
576 
577 static const struct iio_buffer_setup_ops rpr0521_buffer_setup_ops = {
578 	.preenable = rpr0521_buffer_preenable,
579 	.postdisable = rpr0521_buffer_postdisable,
580 };
581 
rpr0521_get_gain(struct rpr0521_data * data,int chan,int * val,int * val2)582 static int rpr0521_get_gain(struct rpr0521_data *data, int chan,
583 			    int *val, int *val2)
584 {
585 	int ret, reg, idx;
586 
587 	ret = regmap_read(data->regmap, rpr0521_gain[chan].reg, &reg);
588 	if (ret < 0)
589 		return ret;
590 
591 	idx = (rpr0521_gain[chan].mask & reg) >> rpr0521_gain[chan].shift;
592 	*val = rpr0521_gain[chan].gain[idx].scale;
593 	*val2 = rpr0521_gain[chan].gain[idx].uscale;
594 
595 	return 0;
596 }
597 
rpr0521_set_gain(struct rpr0521_data * data,int chan,int val,int val2)598 static int rpr0521_set_gain(struct rpr0521_data *data, int chan,
599 			    int val, int val2)
600 {
601 	int i, idx = -EINVAL;
602 
603 	/* get gain index */
604 	for (i = 0; i < rpr0521_gain[chan].size; i++)
605 		if (val == rpr0521_gain[chan].gain[i].scale &&
606 		    val2 == rpr0521_gain[chan].gain[i].uscale) {
607 			idx = i;
608 			break;
609 		}
610 
611 	if (idx < 0)
612 		return idx;
613 
614 	return regmap_update_bits(data->regmap, rpr0521_gain[chan].reg,
615 				  rpr0521_gain[chan].mask,
616 				  idx << rpr0521_gain[chan].shift);
617 }
618 
rpr0521_read_samp_freq(struct rpr0521_data * data,enum iio_chan_type chan_type,int * val,int * val2)619 static int rpr0521_read_samp_freq(struct rpr0521_data *data,
620 				enum iio_chan_type chan_type,
621 			    int *val, int *val2)
622 {
623 	int reg, ret;
624 
625 	ret = regmap_read(data->regmap, RPR0521_REG_MODE_CTRL, &reg);
626 	if (ret < 0)
627 		return ret;
628 
629 	reg &= RPR0521_MODE_MEAS_TIME_MASK;
630 	if (reg >= ARRAY_SIZE(rpr0521_samp_freq_i))
631 		return -EINVAL;
632 
633 	switch (chan_type) {
634 	case IIO_INTENSITY:
635 		*val = rpr0521_samp_freq_i[reg].als_hz;
636 		*val2 = rpr0521_samp_freq_i[reg].als_uhz;
637 		return 0;
638 
639 	case IIO_PROXIMITY:
640 		*val = rpr0521_samp_freq_i[reg].pxs_hz;
641 		*val2 = rpr0521_samp_freq_i[reg].pxs_uhz;
642 		return 0;
643 
644 	default:
645 		return -EINVAL;
646 	}
647 }
648 
rpr0521_write_samp_freq_common(struct rpr0521_data * data,enum iio_chan_type chan_type,int val,int val2)649 static int rpr0521_write_samp_freq_common(struct rpr0521_data *data,
650 				enum iio_chan_type chan_type,
651 				int val, int val2)
652 {
653 	int i;
654 
655 	/*
656 	 * Ignore channel
657 	 * both pxs and als are setup only to same freq because of simplicity
658 	 */
659 	switch (val) {
660 	case 0:
661 		i = 0;
662 		break;
663 
664 	case 2:
665 		if (val2 != 500000)
666 			return -EINVAL;
667 
668 		i = 11;
669 		break;
670 
671 	case 10:
672 		i = 6;
673 		break;
674 
675 	default:
676 		return -EINVAL;
677 	}
678 
679 	return regmap_update_bits(data->regmap,
680 		RPR0521_REG_MODE_CTRL,
681 		RPR0521_MODE_MEAS_TIME_MASK,
682 		i);
683 }
684 
rpr0521_read_ps_offset(struct rpr0521_data * data,int * offset)685 static int rpr0521_read_ps_offset(struct rpr0521_data *data, int *offset)
686 {
687 	int ret;
688 	__le16 buffer;
689 
690 	ret = regmap_bulk_read(data->regmap,
691 		RPR0521_REG_PS_OFFSET_LSB, &buffer, sizeof(buffer));
692 
693 	if (ret < 0) {
694 		dev_err(&data->client->dev, "Failed to read PS OFFSET register\n");
695 		return ret;
696 	}
697 	*offset = le16_to_cpu(buffer);
698 
699 	return ret;
700 }
701 
rpr0521_write_ps_offset(struct rpr0521_data * data,int offset)702 static int rpr0521_write_ps_offset(struct rpr0521_data *data, int offset)
703 {
704 	int ret;
705 	__le16 buffer;
706 
707 	buffer = cpu_to_le16(offset & 0x3ff);
708 	ret = regmap_raw_write(data->regmap,
709 		RPR0521_REG_PS_OFFSET_LSB, &buffer, sizeof(buffer));
710 
711 	if (ret < 0) {
712 		dev_err(&data->client->dev, "Failed to write PS OFFSET register\n");
713 		return ret;
714 	}
715 
716 	return ret;
717 }
718 
rpr0521_read_raw(struct iio_dev * indio_dev,struct iio_chan_spec const * chan,int * val,int * val2,long mask)719 static int rpr0521_read_raw(struct iio_dev *indio_dev,
720 			    struct iio_chan_spec const *chan, int *val,
721 			    int *val2, long mask)
722 {
723 	struct rpr0521_data *data = iio_priv(indio_dev);
724 	int ret;
725 	int busy;
726 	u8 device_mask;
727 	__le16 raw_data;
728 
729 	switch (mask) {
730 	case IIO_CHAN_INFO_RAW:
731 		if (chan->type != IIO_INTENSITY && chan->type != IIO_PROXIMITY)
732 			return -EINVAL;
733 
734 		busy = iio_device_claim_direct_mode(indio_dev);
735 		if (busy)
736 			return -EBUSY;
737 
738 		device_mask = rpr0521_data_reg[chan->address].device_mask;
739 
740 		mutex_lock(&data->lock);
741 		ret = rpr0521_set_power_state(data, true, device_mask);
742 		if (ret < 0)
743 			goto rpr0521_read_raw_out;
744 
745 		ret = regmap_bulk_read(data->regmap,
746 				       rpr0521_data_reg[chan->address].address,
747 				       &raw_data, sizeof(raw_data));
748 		if (ret < 0) {
749 			rpr0521_set_power_state(data, false, device_mask);
750 			goto rpr0521_read_raw_out;
751 		}
752 
753 		ret = rpr0521_set_power_state(data, false, device_mask);
754 
755 rpr0521_read_raw_out:
756 		mutex_unlock(&data->lock);
757 		iio_device_release_direct_mode(indio_dev);
758 		if (ret < 0)
759 			return ret;
760 
761 		*val = le16_to_cpu(raw_data);
762 
763 		return IIO_VAL_INT;
764 
765 	case IIO_CHAN_INFO_SCALE:
766 		mutex_lock(&data->lock);
767 		ret = rpr0521_get_gain(data, chan->address, val, val2);
768 		mutex_unlock(&data->lock);
769 		if (ret < 0)
770 			return ret;
771 
772 		return IIO_VAL_INT_PLUS_MICRO;
773 
774 	case IIO_CHAN_INFO_SAMP_FREQ:
775 		mutex_lock(&data->lock);
776 		ret = rpr0521_read_samp_freq(data, chan->type, val, val2);
777 		mutex_unlock(&data->lock);
778 		if (ret < 0)
779 			return ret;
780 
781 		return IIO_VAL_INT_PLUS_MICRO;
782 
783 	case IIO_CHAN_INFO_OFFSET:
784 		mutex_lock(&data->lock);
785 		ret = rpr0521_read_ps_offset(data, val);
786 		mutex_unlock(&data->lock);
787 		if (ret < 0)
788 			return ret;
789 
790 		return IIO_VAL_INT;
791 
792 	default:
793 		return -EINVAL;
794 	}
795 }
796 
rpr0521_write_raw(struct iio_dev * indio_dev,struct iio_chan_spec const * chan,int val,int val2,long mask)797 static int rpr0521_write_raw(struct iio_dev *indio_dev,
798 			     struct iio_chan_spec const *chan, int val,
799 			     int val2, long mask)
800 {
801 	struct rpr0521_data *data = iio_priv(indio_dev);
802 	int ret;
803 
804 	switch (mask) {
805 	case IIO_CHAN_INFO_SCALE:
806 		mutex_lock(&data->lock);
807 		ret = rpr0521_set_gain(data, chan->address, val, val2);
808 		mutex_unlock(&data->lock);
809 
810 		return ret;
811 
812 	case IIO_CHAN_INFO_SAMP_FREQ:
813 		mutex_lock(&data->lock);
814 		ret = rpr0521_write_samp_freq_common(data, chan->type,
815 						     val, val2);
816 		mutex_unlock(&data->lock);
817 
818 		return ret;
819 
820 	case IIO_CHAN_INFO_OFFSET:
821 		mutex_lock(&data->lock);
822 		ret = rpr0521_write_ps_offset(data, val);
823 		mutex_unlock(&data->lock);
824 
825 		return ret;
826 
827 	default:
828 		return -EINVAL;
829 	}
830 }
831 
832 static const struct iio_info rpr0521_info = {
833 	.read_raw	= rpr0521_read_raw,
834 	.write_raw	= rpr0521_write_raw,
835 	.attrs		= &rpr0521_attribute_group,
836 };
837 
rpr0521_init(struct rpr0521_data * data)838 static int rpr0521_init(struct rpr0521_data *data)
839 {
840 	int ret;
841 	int id;
842 
843 	ret = regmap_read(data->regmap, RPR0521_REG_ID, &id);
844 	if (ret < 0) {
845 		dev_err(&data->client->dev, "Failed to read REG_ID register\n");
846 		return ret;
847 	}
848 
849 	if (id != RPR0521_MANUFACT_ID) {
850 		dev_err(&data->client->dev, "Wrong id, got %x, expected %x\n",
851 			id, RPR0521_MANUFACT_ID);
852 		return -ENODEV;
853 	}
854 
855 	/* set default measurement time - 100 ms for both ALS and PS */
856 	ret = regmap_update_bits(data->regmap, RPR0521_REG_MODE_CTRL,
857 				 RPR0521_MODE_MEAS_TIME_MASK,
858 				 RPR0521_DEFAULT_MEAS_TIME);
859 	if (ret) {
860 		pr_err("regmap_update_bits returned %d\n", ret);
861 		return ret;
862 	}
863 
864 #ifndef CONFIG_PM
865 	ret = rpr0521_als_enable(data, RPR0521_MODE_ALS_ENABLE);
866 	if (ret < 0)
867 		return ret;
868 	ret = rpr0521_pxs_enable(data, RPR0521_MODE_PXS_ENABLE);
869 	if (ret < 0)
870 		return ret;
871 #endif
872 
873 	data->irq_timestamp = 0;
874 
875 	return 0;
876 }
877 
rpr0521_poweroff(struct rpr0521_data * data)878 static int rpr0521_poweroff(struct rpr0521_data *data)
879 {
880 	int ret;
881 	int tmp;
882 
883 	ret = regmap_update_bits(data->regmap, RPR0521_REG_MODE_CTRL,
884 				 RPR0521_MODE_ALS_MASK |
885 				 RPR0521_MODE_PXS_MASK,
886 				 RPR0521_MODE_ALS_DISABLE |
887 				 RPR0521_MODE_PXS_DISABLE);
888 	if (ret < 0)
889 		return ret;
890 
891 	data->als_dev_en = false;
892 	data->pxs_dev_en = false;
893 
894 	/*
895 	 * Int pin keeps state after power off. Set pin to high impedance
896 	 * mode to prevent power drain.
897 	 */
898 	ret = regmap_read(data->regmap, RPR0521_REG_INTERRUPT, &tmp);
899 	if (ret) {
900 		dev_err(&data->client->dev, "Failed to reset int pin.\n");
901 		return ret;
902 	}
903 
904 	return 0;
905 }
906 
rpr0521_is_volatile_reg(struct device * dev,unsigned int reg)907 static bool rpr0521_is_volatile_reg(struct device *dev, unsigned int reg)
908 {
909 	switch (reg) {
910 	case RPR0521_REG_MODE_CTRL:
911 	case RPR0521_REG_ALS_CTRL:
912 	case RPR0521_REG_PXS_CTRL:
913 		return false;
914 	default:
915 		return true;
916 	}
917 }
918 
919 static const struct regmap_config rpr0521_regmap_config = {
920 	.name		= RPR0521_REGMAP_NAME,
921 
922 	.reg_bits	= 8,
923 	.val_bits	= 8,
924 
925 	.max_register	= RPR0521_REG_ID,
926 	.cache_type	= REGCACHE_RBTREE,
927 	.volatile_reg	= rpr0521_is_volatile_reg,
928 };
929 
rpr0521_probe(struct i2c_client * client)930 static int rpr0521_probe(struct i2c_client *client)
931 {
932 	struct rpr0521_data *data;
933 	struct iio_dev *indio_dev;
934 	struct regmap *regmap;
935 	int ret;
936 
937 	indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data));
938 	if (!indio_dev)
939 		return -ENOMEM;
940 
941 	regmap = devm_regmap_init_i2c(client, &rpr0521_regmap_config);
942 	if (IS_ERR(regmap)) {
943 		dev_err(&client->dev, "regmap_init failed!\n");
944 		return PTR_ERR(regmap);
945 	}
946 
947 	data = iio_priv(indio_dev);
948 	i2c_set_clientdata(client, indio_dev);
949 	data->client = client;
950 	data->regmap = regmap;
951 
952 	mutex_init(&data->lock);
953 
954 	indio_dev->info = &rpr0521_info;
955 	indio_dev->name = RPR0521_DRV_NAME;
956 	indio_dev->channels = rpr0521_channels;
957 	indio_dev->num_channels = ARRAY_SIZE(rpr0521_channels);
958 	indio_dev->modes = INDIO_DIRECT_MODE;
959 
960 	ret = rpr0521_init(data);
961 	if (ret < 0) {
962 		dev_err(&client->dev, "rpr0521 chip init failed\n");
963 		return ret;
964 	}
965 
966 	ret = pm_runtime_set_active(&client->dev);
967 	if (ret < 0)
968 		goto err_poweroff;
969 
970 	pm_runtime_enable(&client->dev);
971 	pm_runtime_set_autosuspend_delay(&client->dev, RPR0521_SLEEP_DELAY_MS);
972 	pm_runtime_use_autosuspend(&client->dev);
973 
974 	/*
975 	 * If sensor write/read is needed in _probe after _use_autosuspend,
976 	 * sensor needs to be _resumed first using rpr0521_set_power_state().
977 	 */
978 
979 	/* IRQ to trigger setup */
980 	if (client->irq) {
981 		/* Trigger0 producer setup */
982 		data->drdy_trigger0 = devm_iio_trigger_alloc(
983 			indio_dev->dev.parent,
984 			"%s-dev%d", indio_dev->name, iio_device_id(indio_dev));
985 		if (!data->drdy_trigger0) {
986 			ret = -ENOMEM;
987 			goto err_pm_disable;
988 		}
989 		data->drdy_trigger0->ops = &rpr0521_trigger_ops;
990 		indio_dev->available_scan_masks = rpr0521_available_scan_masks;
991 		iio_trigger_set_drvdata(data->drdy_trigger0, indio_dev);
992 
993 		/* Ties irq to trigger producer handler. */
994 		ret = devm_request_threaded_irq(&client->dev, client->irq,
995 			rpr0521_drdy_irq_handler, rpr0521_drdy_irq_thread,
996 			IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
997 			RPR0521_IRQ_NAME, indio_dev);
998 		if (ret < 0) {
999 			dev_err(&client->dev, "request irq %d for trigger0 failed\n",
1000 				client->irq);
1001 			goto err_pm_disable;
1002 			}
1003 
1004 		ret = devm_iio_trigger_register(indio_dev->dev.parent,
1005 						data->drdy_trigger0);
1006 		if (ret) {
1007 			dev_err(&client->dev, "iio trigger register failed\n");
1008 			goto err_pm_disable;
1009 		}
1010 
1011 		/*
1012 		 * Now whole pipe from physical interrupt (irq defined by
1013 		 * devicetree to device) to trigger0 output is set up.
1014 		 */
1015 
1016 		/* Trigger consumer setup */
1017 		ret = devm_iio_triggered_buffer_setup(indio_dev->dev.parent,
1018 			indio_dev,
1019 			rpr0521_trigger_consumer_store_time,
1020 			rpr0521_trigger_consumer_handler,
1021 			&rpr0521_buffer_setup_ops);
1022 		if (ret < 0) {
1023 			dev_err(&client->dev, "iio triggered buffer setup failed\n");
1024 			goto err_pm_disable;
1025 		}
1026 	}
1027 
1028 	ret = iio_device_register(indio_dev);
1029 	if (ret)
1030 		goto err_pm_disable;
1031 
1032 	return 0;
1033 
1034 err_pm_disable:
1035 	pm_runtime_disable(&client->dev);
1036 	pm_runtime_set_suspended(&client->dev);
1037 err_poweroff:
1038 	rpr0521_poweroff(data);
1039 
1040 	return ret;
1041 }
1042 
rpr0521_remove(struct i2c_client * client)1043 static void rpr0521_remove(struct i2c_client *client)
1044 {
1045 	struct iio_dev *indio_dev = i2c_get_clientdata(client);
1046 
1047 	iio_device_unregister(indio_dev);
1048 
1049 	pm_runtime_disable(&client->dev);
1050 	pm_runtime_set_suspended(&client->dev);
1051 
1052 	rpr0521_poweroff(iio_priv(indio_dev));
1053 }
1054 
rpr0521_runtime_suspend(struct device * dev)1055 static int rpr0521_runtime_suspend(struct device *dev)
1056 {
1057 	struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
1058 	struct rpr0521_data *data = iio_priv(indio_dev);
1059 	int ret;
1060 
1061 	mutex_lock(&data->lock);
1062 	/* If measurements are enabled, enable them on resume */
1063 	if (!data->als_need_dis)
1064 		data->als_ps_need_en = data->als_dev_en;
1065 	if (!data->pxs_need_dis)
1066 		data->pxs_ps_need_en = data->pxs_dev_en;
1067 
1068 	/* disable channels and sets {als,pxs}_dev_en to false */
1069 	ret = rpr0521_poweroff(data);
1070 	regcache_mark_dirty(data->regmap);
1071 	mutex_unlock(&data->lock);
1072 
1073 	return ret;
1074 }
1075 
rpr0521_runtime_resume(struct device * dev)1076 static int rpr0521_runtime_resume(struct device *dev)
1077 {
1078 	struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
1079 	struct rpr0521_data *data = iio_priv(indio_dev);
1080 	int ret;
1081 
1082 	regcache_sync(data->regmap);
1083 	if (data->als_ps_need_en) {
1084 		ret = rpr0521_als_enable(data, RPR0521_MODE_ALS_ENABLE);
1085 		if (ret < 0)
1086 			return ret;
1087 		data->als_ps_need_en = false;
1088 	}
1089 
1090 	if (data->pxs_ps_need_en) {
1091 		ret = rpr0521_pxs_enable(data, RPR0521_MODE_PXS_ENABLE);
1092 		if (ret < 0)
1093 			return ret;
1094 		data->pxs_ps_need_en = false;
1095 	}
1096 	msleep(100);	//wait for first measurement result
1097 
1098 	return 0;
1099 }
1100 
1101 static const struct dev_pm_ops rpr0521_pm_ops = {
1102 	RUNTIME_PM_OPS(rpr0521_runtime_suspend, rpr0521_runtime_resume, NULL)
1103 };
1104 
1105 static const struct acpi_device_id rpr0521_acpi_match[] = {
1106 	{"RPR0521", 0},
1107 	{ }
1108 };
1109 MODULE_DEVICE_TABLE(acpi, rpr0521_acpi_match);
1110 
1111 static const struct i2c_device_id rpr0521_id[] = {
1112 	{"rpr0521", 0},
1113 	{ }
1114 };
1115 
1116 MODULE_DEVICE_TABLE(i2c, rpr0521_id);
1117 
1118 static struct i2c_driver rpr0521_driver = {
1119 	.driver = {
1120 		.name	= RPR0521_DRV_NAME,
1121 		.pm	= pm_ptr(&rpr0521_pm_ops),
1122 		.acpi_match_table = ACPI_PTR(rpr0521_acpi_match),
1123 	},
1124 	.probe		= rpr0521_probe,
1125 	.remove		= rpr0521_remove,
1126 	.id_table	= rpr0521_id,
1127 };
1128 
1129 module_i2c_driver(rpr0521_driver);
1130 
1131 MODULE_AUTHOR("Daniel Baluta <daniel.baluta@intel.com>");
1132 MODULE_DESCRIPTION("RPR0521 ROHM Ambient Light and Proximity Sensor driver");
1133 MODULE_LICENSE("GPL v2");
1134