xref: /linux/drivers/iio/light/tsl2563.c (revision c79c3c34f75d72a066e292b10aa50fc758c97c89)
1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3  * drivers/iio/light/tsl2563.c
4  *
5  * Copyright (C) 2008 Nokia Corporation
6  *
7  * Written by Timo O. Karjalainen <timo.o.karjalainen@nokia.com>
8  * Contact: Amit Kucheria <amit.kucheria@verdurent.com>
9  *
10  * Converted to IIO driver
11  * Amit Kucheria <amit.kucheria@verdurent.com>
12  */
13 
14 #include <linux/module.h>
15 #include <linux/mod_devicetable.h>
16 #include <linux/property.h>
17 #include <linux/i2c.h>
18 #include <linux/interrupt.h>
19 #include <linux/irq.h>
20 #include <linux/sched.h>
21 #include <linux/mutex.h>
22 #include <linux/delay.h>
23 #include <linux/pm.h>
24 #include <linux/err.h>
25 #include <linux/slab.h>
26 
27 #include <linux/iio/iio.h>
28 #include <linux/iio/sysfs.h>
29 #include <linux/iio/events.h>
30 #include <linux/platform_data/tsl2563.h>
31 
32 /* Use this many bits for fraction part. */
33 #define ADC_FRAC_BITS		14
34 
35 /* Given number of 1/10000's in ADC_FRAC_BITS precision. */
36 #define FRAC10K(f)		(((f) * (1L << (ADC_FRAC_BITS))) / (10000))
37 
38 /* Bits used for fraction in calibration coefficients.*/
39 #define CALIB_FRAC_BITS		10
40 /* 0.5 in CALIB_FRAC_BITS precision */
41 #define CALIB_FRAC_HALF		(1 << (CALIB_FRAC_BITS - 1))
42 /* Make a fraction from a number n that was multiplied with b. */
43 #define CALIB_FRAC(n, b)	(((n) << CALIB_FRAC_BITS) / (b))
44 /* Decimal 10^(digits in sysfs presentation) */
45 #define CALIB_BASE_SYSFS	1000
46 
47 #define TSL2563_CMD		0x80
48 #define TSL2563_CLEARINT	0x40
49 
50 #define TSL2563_REG_CTRL	0x00
51 #define TSL2563_REG_TIMING	0x01
52 #define TSL2563_REG_LOWLOW	0x02 /* data0 low threshold, 2 bytes */
53 #define TSL2563_REG_LOWHIGH	0x03
54 #define TSL2563_REG_HIGHLOW	0x04 /* data0 high threshold, 2 bytes */
55 #define TSL2563_REG_HIGHHIGH	0x05
56 #define TSL2563_REG_INT		0x06
57 #define TSL2563_REG_ID		0x0a
58 #define TSL2563_REG_DATA0LOW	0x0c /* broadband sensor value, 2 bytes */
59 #define TSL2563_REG_DATA0HIGH	0x0d
60 #define TSL2563_REG_DATA1LOW	0x0e /* infrared sensor value, 2 bytes */
61 #define TSL2563_REG_DATA1HIGH	0x0f
62 
63 #define TSL2563_CMD_POWER_ON	0x03
64 #define TSL2563_CMD_POWER_OFF	0x00
65 #define TSL2563_CTRL_POWER_MASK	0x03
66 
67 #define TSL2563_TIMING_13MS	0x00
68 #define TSL2563_TIMING_100MS	0x01
69 #define TSL2563_TIMING_400MS	0x02
70 #define TSL2563_TIMING_MASK	0x03
71 #define TSL2563_TIMING_GAIN16	0x10
72 #define TSL2563_TIMING_GAIN1	0x00
73 
74 #define TSL2563_INT_DISABLED	0x00
75 #define TSL2563_INT_LEVEL	0x10
76 #define TSL2563_INT_PERSIST(n)	((n) & 0x0F)
77 
78 struct tsl2563_gainlevel_coeff {
79 	u8 gaintime;
80 	u16 min;
81 	u16 max;
82 };
83 
84 static const struct tsl2563_gainlevel_coeff tsl2563_gainlevel_table[] = {
85 	{
86 		.gaintime	= TSL2563_TIMING_400MS | TSL2563_TIMING_GAIN16,
87 		.min		= 0,
88 		.max		= 65534,
89 	}, {
90 		.gaintime	= TSL2563_TIMING_400MS | TSL2563_TIMING_GAIN1,
91 		.min		= 2048,
92 		.max		= 65534,
93 	}, {
94 		.gaintime	= TSL2563_TIMING_100MS | TSL2563_TIMING_GAIN1,
95 		.min		= 4095,
96 		.max		= 37177,
97 	}, {
98 		.gaintime	= TSL2563_TIMING_13MS | TSL2563_TIMING_GAIN1,
99 		.min		= 3000,
100 		.max		= 65535,
101 	},
102 };
103 
104 struct tsl2563_chip {
105 	struct mutex		lock;
106 	struct i2c_client	*client;
107 	struct delayed_work	poweroff_work;
108 
109 	/* Remember state for suspend and resume functions */
110 	bool suspended;
111 
112 	struct tsl2563_gainlevel_coeff const *gainlevel;
113 
114 	u16			low_thres;
115 	u16			high_thres;
116 	u8			intr;
117 	bool			int_enabled;
118 
119 	/* Calibration coefficients */
120 	u32			calib0;
121 	u32			calib1;
122 	int			cover_comp_gain;
123 
124 	/* Cache current values, to be returned while suspended */
125 	u32			data0;
126 	u32			data1;
127 };
128 
129 static int tsl2563_set_power(struct tsl2563_chip *chip, int on)
130 {
131 	struct i2c_client *client = chip->client;
132 	u8 cmd;
133 
134 	cmd = on ? TSL2563_CMD_POWER_ON : TSL2563_CMD_POWER_OFF;
135 	return i2c_smbus_write_byte_data(client,
136 					 TSL2563_CMD | TSL2563_REG_CTRL, cmd);
137 }
138 
139 /*
140  * Return value is 0 for off, 1 for on, or a negative error
141  * code if reading failed.
142  */
143 static int tsl2563_get_power(struct tsl2563_chip *chip)
144 {
145 	struct i2c_client *client = chip->client;
146 	int ret;
147 
148 	ret = i2c_smbus_read_byte_data(client, TSL2563_CMD | TSL2563_REG_CTRL);
149 	if (ret < 0)
150 		return ret;
151 
152 	return (ret & TSL2563_CTRL_POWER_MASK) == TSL2563_CMD_POWER_ON;
153 }
154 
155 static int tsl2563_configure(struct tsl2563_chip *chip)
156 {
157 	int ret;
158 
159 	ret = i2c_smbus_write_byte_data(chip->client,
160 			TSL2563_CMD | TSL2563_REG_TIMING,
161 			chip->gainlevel->gaintime);
162 	if (ret)
163 		goto error_ret;
164 	ret = i2c_smbus_write_byte_data(chip->client,
165 			TSL2563_CMD | TSL2563_REG_HIGHLOW,
166 			chip->high_thres & 0xFF);
167 	if (ret)
168 		goto error_ret;
169 	ret = i2c_smbus_write_byte_data(chip->client,
170 			TSL2563_CMD | TSL2563_REG_HIGHHIGH,
171 			(chip->high_thres >> 8) & 0xFF);
172 	if (ret)
173 		goto error_ret;
174 	ret = i2c_smbus_write_byte_data(chip->client,
175 			TSL2563_CMD | TSL2563_REG_LOWLOW,
176 			chip->low_thres & 0xFF);
177 	if (ret)
178 		goto error_ret;
179 	ret = i2c_smbus_write_byte_data(chip->client,
180 			TSL2563_CMD | TSL2563_REG_LOWHIGH,
181 			(chip->low_thres >> 8) & 0xFF);
182 /*
183  * Interrupt register is automatically written anyway if it is relevant
184  * so is not here.
185  */
186 error_ret:
187 	return ret;
188 }
189 
190 static void tsl2563_poweroff_work(struct work_struct *work)
191 {
192 	struct tsl2563_chip *chip =
193 		container_of(work, struct tsl2563_chip, poweroff_work.work);
194 	tsl2563_set_power(chip, 0);
195 }
196 
197 static int tsl2563_detect(struct tsl2563_chip *chip)
198 {
199 	int ret;
200 
201 	ret = tsl2563_set_power(chip, 1);
202 	if (ret)
203 		return ret;
204 
205 	ret = tsl2563_get_power(chip);
206 	if (ret < 0)
207 		return ret;
208 
209 	return ret ? 0 : -ENODEV;
210 }
211 
212 static int tsl2563_read_id(struct tsl2563_chip *chip, u8 *id)
213 {
214 	struct i2c_client *client = chip->client;
215 	int ret;
216 
217 	ret = i2c_smbus_read_byte_data(client, TSL2563_CMD | TSL2563_REG_ID);
218 	if (ret < 0)
219 		return ret;
220 
221 	*id = ret;
222 
223 	return 0;
224 }
225 
226 /*
227  * "Normalized" ADC value is one obtained with 400ms of integration time and
228  * 16x gain. This function returns the number of bits of shift needed to
229  * convert between normalized values and HW values obtained using given
230  * timing and gain settings.
231  */
232 static int tsl2563_adc_shiftbits(u8 timing)
233 {
234 	int shift = 0;
235 
236 	switch (timing & TSL2563_TIMING_MASK) {
237 	case TSL2563_TIMING_13MS:
238 		shift += 5;
239 		break;
240 	case TSL2563_TIMING_100MS:
241 		shift += 2;
242 		break;
243 	case TSL2563_TIMING_400MS:
244 		/* no-op */
245 		break;
246 	}
247 
248 	if (!(timing & TSL2563_TIMING_GAIN16))
249 		shift += 4;
250 
251 	return shift;
252 }
253 
254 /* Convert a HW ADC value to normalized scale. */
255 static u32 tsl2563_normalize_adc(u16 adc, u8 timing)
256 {
257 	return adc << tsl2563_adc_shiftbits(timing);
258 }
259 
260 static void tsl2563_wait_adc(struct tsl2563_chip *chip)
261 {
262 	unsigned int delay;
263 
264 	switch (chip->gainlevel->gaintime & TSL2563_TIMING_MASK) {
265 	case TSL2563_TIMING_13MS:
266 		delay = 14;
267 		break;
268 	case TSL2563_TIMING_100MS:
269 		delay = 101;
270 		break;
271 	default:
272 		delay = 402;
273 	}
274 	/*
275 	 * TODO: Make sure that we wait at least required delay but why we
276 	 * have to extend it one tick more?
277 	 */
278 	schedule_timeout_interruptible(msecs_to_jiffies(delay) + 2);
279 }
280 
281 static int tsl2563_adjust_gainlevel(struct tsl2563_chip *chip, u16 adc)
282 {
283 	struct i2c_client *client = chip->client;
284 
285 	if (adc > chip->gainlevel->max || adc < chip->gainlevel->min) {
286 
287 		(adc > chip->gainlevel->max) ?
288 			chip->gainlevel++ : chip->gainlevel--;
289 
290 		i2c_smbus_write_byte_data(client,
291 					  TSL2563_CMD | TSL2563_REG_TIMING,
292 					  chip->gainlevel->gaintime);
293 
294 		tsl2563_wait_adc(chip);
295 		tsl2563_wait_adc(chip);
296 
297 		return 1;
298 	} else
299 		return 0;
300 }
301 
302 static int tsl2563_get_adc(struct tsl2563_chip *chip)
303 {
304 	struct i2c_client *client = chip->client;
305 	u16 adc0, adc1;
306 	int retry = 1;
307 	int ret = 0;
308 
309 	if (chip->suspended)
310 		goto out;
311 
312 	if (!chip->int_enabled) {
313 		cancel_delayed_work(&chip->poweroff_work);
314 
315 		if (!tsl2563_get_power(chip)) {
316 			ret = tsl2563_set_power(chip, 1);
317 			if (ret)
318 				goto out;
319 			ret = tsl2563_configure(chip);
320 			if (ret)
321 				goto out;
322 			tsl2563_wait_adc(chip);
323 		}
324 	}
325 
326 	while (retry) {
327 		ret = i2c_smbus_read_word_data(client,
328 				TSL2563_CMD | TSL2563_REG_DATA0LOW);
329 		if (ret < 0)
330 			goto out;
331 		adc0 = ret;
332 
333 		ret = i2c_smbus_read_word_data(client,
334 				TSL2563_CMD | TSL2563_REG_DATA1LOW);
335 		if (ret < 0)
336 			goto out;
337 		adc1 = ret;
338 
339 		retry = tsl2563_adjust_gainlevel(chip, adc0);
340 	}
341 
342 	chip->data0 = tsl2563_normalize_adc(adc0, chip->gainlevel->gaintime);
343 	chip->data1 = tsl2563_normalize_adc(adc1, chip->gainlevel->gaintime);
344 
345 	if (!chip->int_enabled)
346 		schedule_delayed_work(&chip->poweroff_work, 5 * HZ);
347 
348 	ret = 0;
349 out:
350 	return ret;
351 }
352 
353 static inline int tsl2563_calib_to_sysfs(u32 calib)
354 {
355 	return (int) (((calib * CALIB_BASE_SYSFS) +
356 		       CALIB_FRAC_HALF) >> CALIB_FRAC_BITS);
357 }
358 
359 static inline u32 tsl2563_calib_from_sysfs(int value)
360 {
361 	return (((u32) value) << CALIB_FRAC_BITS) / CALIB_BASE_SYSFS;
362 }
363 
364 /*
365  * Conversions between lux and ADC values.
366  *
367  * The basic formula is lux = c0 * adc0 - c1 * adc1, where c0 and c1 are
368  * appropriate constants. Different constants are needed for different
369  * kinds of light, determined by the ratio adc1/adc0 (basically the ratio
370  * of the intensities in infrared and visible wavelengths). lux_table below
371  * lists the upper threshold of the adc1/adc0 ratio and the corresponding
372  * constants.
373  */
374 
375 struct tsl2563_lux_coeff {
376 	unsigned long ch_ratio;
377 	unsigned long ch0_coeff;
378 	unsigned long ch1_coeff;
379 };
380 
381 static const struct tsl2563_lux_coeff lux_table[] = {
382 	{
383 		.ch_ratio	= FRAC10K(1300),
384 		.ch0_coeff	= FRAC10K(315),
385 		.ch1_coeff	= FRAC10K(262),
386 	}, {
387 		.ch_ratio	= FRAC10K(2600),
388 		.ch0_coeff	= FRAC10K(337),
389 		.ch1_coeff	= FRAC10K(430),
390 	}, {
391 		.ch_ratio	= FRAC10K(3900),
392 		.ch0_coeff	= FRAC10K(363),
393 		.ch1_coeff	= FRAC10K(529),
394 	}, {
395 		.ch_ratio	= FRAC10K(5200),
396 		.ch0_coeff	= FRAC10K(392),
397 		.ch1_coeff	= FRAC10K(605),
398 	}, {
399 		.ch_ratio	= FRAC10K(6500),
400 		.ch0_coeff	= FRAC10K(229),
401 		.ch1_coeff	= FRAC10K(291),
402 	}, {
403 		.ch_ratio	= FRAC10K(8000),
404 		.ch0_coeff	= FRAC10K(157),
405 		.ch1_coeff	= FRAC10K(180),
406 	}, {
407 		.ch_ratio	= FRAC10K(13000),
408 		.ch0_coeff	= FRAC10K(34),
409 		.ch1_coeff	= FRAC10K(26),
410 	}, {
411 		.ch_ratio	= ULONG_MAX,
412 		.ch0_coeff	= 0,
413 		.ch1_coeff	= 0,
414 	},
415 };
416 
417 /* Convert normalized, scaled ADC values to lux. */
418 static unsigned int tsl2563_adc_to_lux(u32 adc0, u32 adc1)
419 {
420 	const struct tsl2563_lux_coeff *lp = lux_table;
421 	unsigned long ratio, lux, ch0 = adc0, ch1 = adc1;
422 
423 	ratio = ch0 ? ((ch1 << ADC_FRAC_BITS) / ch0) : ULONG_MAX;
424 
425 	while (lp->ch_ratio < ratio)
426 		lp++;
427 
428 	lux = ch0 * lp->ch0_coeff - ch1 * lp->ch1_coeff;
429 
430 	return (unsigned int) (lux >> ADC_FRAC_BITS);
431 }
432 
433 /* Apply calibration coefficient to ADC count. */
434 static u32 tsl2563_calib_adc(u32 adc, u32 calib)
435 {
436 	unsigned long scaled = adc;
437 
438 	scaled *= calib;
439 	scaled >>= CALIB_FRAC_BITS;
440 
441 	return (u32) scaled;
442 }
443 
444 static int tsl2563_write_raw(struct iio_dev *indio_dev,
445 			       struct iio_chan_spec const *chan,
446 			       int val,
447 			       int val2,
448 			       long mask)
449 {
450 	struct tsl2563_chip *chip = iio_priv(indio_dev);
451 
452 	if (mask != IIO_CHAN_INFO_CALIBSCALE)
453 		return -EINVAL;
454 	if (chan->channel2 == IIO_MOD_LIGHT_BOTH)
455 		chip->calib0 = tsl2563_calib_from_sysfs(val);
456 	else if (chan->channel2 == IIO_MOD_LIGHT_IR)
457 		chip->calib1 = tsl2563_calib_from_sysfs(val);
458 	else
459 		return -EINVAL;
460 
461 	return 0;
462 }
463 
464 static int tsl2563_read_raw(struct iio_dev *indio_dev,
465 			    struct iio_chan_spec const *chan,
466 			    int *val,
467 			    int *val2,
468 			    long mask)
469 {
470 	int ret = -EINVAL;
471 	u32 calib0, calib1;
472 	struct tsl2563_chip *chip = iio_priv(indio_dev);
473 
474 	mutex_lock(&chip->lock);
475 	switch (mask) {
476 	case IIO_CHAN_INFO_RAW:
477 	case IIO_CHAN_INFO_PROCESSED:
478 		switch (chan->type) {
479 		case IIO_LIGHT:
480 			ret = tsl2563_get_adc(chip);
481 			if (ret)
482 				goto error_ret;
483 			calib0 = tsl2563_calib_adc(chip->data0, chip->calib0) *
484 				chip->cover_comp_gain;
485 			calib1 = tsl2563_calib_adc(chip->data1, chip->calib1) *
486 				chip->cover_comp_gain;
487 			*val = tsl2563_adc_to_lux(calib0, calib1);
488 			ret = IIO_VAL_INT;
489 			break;
490 		case IIO_INTENSITY:
491 			ret = tsl2563_get_adc(chip);
492 			if (ret)
493 				goto error_ret;
494 			if (chan->channel2 == IIO_MOD_LIGHT_BOTH)
495 				*val = chip->data0;
496 			else
497 				*val = chip->data1;
498 			ret = IIO_VAL_INT;
499 			break;
500 		default:
501 			break;
502 		}
503 		break;
504 
505 	case IIO_CHAN_INFO_CALIBSCALE:
506 		if (chan->channel2 == IIO_MOD_LIGHT_BOTH)
507 			*val = tsl2563_calib_to_sysfs(chip->calib0);
508 		else
509 			*val = tsl2563_calib_to_sysfs(chip->calib1);
510 		ret = IIO_VAL_INT;
511 		break;
512 	default:
513 		ret = -EINVAL;
514 		goto error_ret;
515 	}
516 
517 error_ret:
518 	mutex_unlock(&chip->lock);
519 	return ret;
520 }
521 
522 static const struct iio_event_spec tsl2563_events[] = {
523 	{
524 		.type = IIO_EV_TYPE_THRESH,
525 		.dir = IIO_EV_DIR_RISING,
526 		.mask_separate = BIT(IIO_EV_INFO_VALUE) |
527 				BIT(IIO_EV_INFO_ENABLE),
528 	}, {
529 		.type = IIO_EV_TYPE_THRESH,
530 		.dir = IIO_EV_DIR_FALLING,
531 		.mask_separate = BIT(IIO_EV_INFO_VALUE) |
532 				BIT(IIO_EV_INFO_ENABLE),
533 	},
534 };
535 
536 static const struct iio_chan_spec tsl2563_channels[] = {
537 	{
538 		.type = IIO_LIGHT,
539 		.indexed = 1,
540 		.info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED),
541 		.channel = 0,
542 	}, {
543 		.type = IIO_INTENSITY,
544 		.modified = 1,
545 		.channel2 = IIO_MOD_LIGHT_BOTH,
546 		.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
547 		BIT(IIO_CHAN_INFO_CALIBSCALE),
548 		.event_spec = tsl2563_events,
549 		.num_event_specs = ARRAY_SIZE(tsl2563_events),
550 	}, {
551 		.type = IIO_INTENSITY,
552 		.modified = 1,
553 		.channel2 = IIO_MOD_LIGHT_IR,
554 		.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
555 		BIT(IIO_CHAN_INFO_CALIBSCALE),
556 	}
557 };
558 
559 static int tsl2563_read_thresh(struct iio_dev *indio_dev,
560 	const struct iio_chan_spec *chan, enum iio_event_type type,
561 	enum iio_event_direction dir, enum iio_event_info info, int *val,
562 	int *val2)
563 {
564 	struct tsl2563_chip *chip = iio_priv(indio_dev);
565 
566 	switch (dir) {
567 	case IIO_EV_DIR_RISING:
568 		*val = chip->high_thres;
569 		break;
570 	case IIO_EV_DIR_FALLING:
571 		*val = chip->low_thres;
572 		break;
573 	default:
574 		return -EINVAL;
575 	}
576 
577 	return IIO_VAL_INT;
578 }
579 
580 static int tsl2563_write_thresh(struct iio_dev *indio_dev,
581 	const struct iio_chan_spec *chan, enum iio_event_type type,
582 	enum iio_event_direction dir, enum iio_event_info info, int val,
583 	int val2)
584 {
585 	struct tsl2563_chip *chip = iio_priv(indio_dev);
586 	int ret;
587 	u8 address;
588 
589 	if (dir == IIO_EV_DIR_RISING)
590 		address = TSL2563_REG_HIGHLOW;
591 	else
592 		address = TSL2563_REG_LOWLOW;
593 	mutex_lock(&chip->lock);
594 	ret = i2c_smbus_write_byte_data(chip->client, TSL2563_CMD | address,
595 					val & 0xFF);
596 	if (ret)
597 		goto error_ret;
598 	ret = i2c_smbus_write_byte_data(chip->client,
599 					TSL2563_CMD | (address + 1),
600 					(val >> 8) & 0xFF);
601 	if (dir == IIO_EV_DIR_RISING)
602 		chip->high_thres = val;
603 	else
604 		chip->low_thres = val;
605 
606 error_ret:
607 	mutex_unlock(&chip->lock);
608 
609 	return ret;
610 }
611 
612 static irqreturn_t tsl2563_event_handler(int irq, void *private)
613 {
614 	struct iio_dev *dev_info = private;
615 	struct tsl2563_chip *chip = iio_priv(dev_info);
616 
617 	iio_push_event(dev_info,
618 		       IIO_UNMOD_EVENT_CODE(IIO_INTENSITY,
619 					    0,
620 					    IIO_EV_TYPE_THRESH,
621 					    IIO_EV_DIR_EITHER),
622 		       iio_get_time_ns(dev_info));
623 
624 	/* clear the interrupt and push the event */
625 	i2c_smbus_write_byte(chip->client, TSL2563_CMD | TSL2563_CLEARINT);
626 	return IRQ_HANDLED;
627 }
628 
629 static int tsl2563_write_interrupt_config(struct iio_dev *indio_dev,
630 	const struct iio_chan_spec *chan, enum iio_event_type type,
631 	enum iio_event_direction dir, int state)
632 {
633 	struct tsl2563_chip *chip = iio_priv(indio_dev);
634 	int ret = 0;
635 
636 	mutex_lock(&chip->lock);
637 	if (state && !(chip->intr & 0x30)) {
638 		chip->intr &= ~0x30;
639 		chip->intr |= 0x10;
640 		/* ensure the chip is actually on */
641 		cancel_delayed_work(&chip->poweroff_work);
642 		if (!tsl2563_get_power(chip)) {
643 			ret = tsl2563_set_power(chip, 1);
644 			if (ret)
645 				goto out;
646 			ret = tsl2563_configure(chip);
647 			if (ret)
648 				goto out;
649 		}
650 		ret = i2c_smbus_write_byte_data(chip->client,
651 						TSL2563_CMD | TSL2563_REG_INT,
652 						chip->intr);
653 		chip->int_enabled = true;
654 	}
655 
656 	if (!state && (chip->intr & 0x30)) {
657 		chip->intr &= ~0x30;
658 		ret = i2c_smbus_write_byte_data(chip->client,
659 						TSL2563_CMD | TSL2563_REG_INT,
660 						chip->intr);
661 		chip->int_enabled = false;
662 		/* now the interrupt is not enabled, we can go to sleep */
663 		schedule_delayed_work(&chip->poweroff_work, 5 * HZ);
664 	}
665 out:
666 	mutex_unlock(&chip->lock);
667 
668 	return ret;
669 }
670 
671 static int tsl2563_read_interrupt_config(struct iio_dev *indio_dev,
672 	const struct iio_chan_spec *chan, enum iio_event_type type,
673 	enum iio_event_direction dir)
674 {
675 	struct tsl2563_chip *chip = iio_priv(indio_dev);
676 	int ret;
677 
678 	mutex_lock(&chip->lock);
679 	ret = i2c_smbus_read_byte_data(chip->client,
680 				       TSL2563_CMD | TSL2563_REG_INT);
681 	mutex_unlock(&chip->lock);
682 	if (ret < 0)
683 		return ret;
684 
685 	return !!(ret & 0x30);
686 }
687 
688 static const struct iio_info tsl2563_info_no_irq = {
689 	.read_raw = &tsl2563_read_raw,
690 	.write_raw = &tsl2563_write_raw,
691 };
692 
693 static const struct iio_info tsl2563_info = {
694 	.read_raw = &tsl2563_read_raw,
695 	.write_raw = &tsl2563_write_raw,
696 	.read_event_value = &tsl2563_read_thresh,
697 	.write_event_value = &tsl2563_write_thresh,
698 	.read_event_config = &tsl2563_read_interrupt_config,
699 	.write_event_config = &tsl2563_write_interrupt_config,
700 };
701 
702 static int tsl2563_probe(struct i2c_client *client,
703 				const struct i2c_device_id *device_id)
704 {
705 	struct iio_dev *indio_dev;
706 	struct tsl2563_chip *chip;
707 	struct tsl2563_platform_data *pdata = client->dev.platform_data;
708 	int err = 0;
709 	u8 id = 0;
710 
711 	indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*chip));
712 	if (!indio_dev)
713 		return -ENOMEM;
714 
715 	chip = iio_priv(indio_dev);
716 
717 	i2c_set_clientdata(client, indio_dev);
718 	chip->client = client;
719 
720 	err = tsl2563_detect(chip);
721 	if (err) {
722 		dev_err(&client->dev, "detect error %d\n", -err);
723 		return err;
724 	}
725 
726 	err = tsl2563_read_id(chip, &id);
727 	if (err) {
728 		dev_err(&client->dev, "read id error %d\n", -err);
729 		return err;
730 	}
731 
732 	mutex_init(&chip->lock);
733 
734 	/* Default values used until userspace says otherwise */
735 	chip->low_thres = 0x0;
736 	chip->high_thres = 0xffff;
737 	chip->gainlevel = tsl2563_gainlevel_table;
738 	chip->intr = TSL2563_INT_PERSIST(4);
739 	chip->calib0 = tsl2563_calib_from_sysfs(CALIB_BASE_SYSFS);
740 	chip->calib1 = tsl2563_calib_from_sysfs(CALIB_BASE_SYSFS);
741 
742 	if (pdata) {
743 		chip->cover_comp_gain = pdata->cover_comp_gain;
744 	} else {
745 		err = device_property_read_u32(&client->dev, "amstaos,cover-comp-gain",
746 					       &chip->cover_comp_gain);
747 		if (err)
748 			chip->cover_comp_gain = 1;
749 	}
750 
751 	dev_info(&client->dev, "model %d, rev. %d\n", id >> 4, id & 0x0f);
752 	indio_dev->name = client->name;
753 	indio_dev->channels = tsl2563_channels;
754 	indio_dev->num_channels = ARRAY_SIZE(tsl2563_channels);
755 	indio_dev->modes = INDIO_DIRECT_MODE;
756 
757 	if (client->irq)
758 		indio_dev->info = &tsl2563_info;
759 	else
760 		indio_dev->info = &tsl2563_info_no_irq;
761 
762 	if (client->irq) {
763 		err = devm_request_threaded_irq(&client->dev, client->irq,
764 					   NULL,
765 					   &tsl2563_event_handler,
766 					   IRQF_TRIGGER_RISING | IRQF_ONESHOT,
767 					   "tsl2563_event",
768 					   indio_dev);
769 		if (err) {
770 			dev_err(&client->dev, "irq request error %d\n", -err);
771 			return err;
772 		}
773 	}
774 
775 	err = tsl2563_configure(chip);
776 	if (err) {
777 		dev_err(&client->dev, "configure error %d\n", -err);
778 		return err;
779 	}
780 
781 	INIT_DELAYED_WORK(&chip->poweroff_work, tsl2563_poweroff_work);
782 
783 	/* The interrupt cannot yet be enabled so this is fine without lock */
784 	schedule_delayed_work(&chip->poweroff_work, 5 * HZ);
785 
786 	err = iio_device_register(indio_dev);
787 	if (err) {
788 		dev_err(&client->dev, "iio registration error %d\n", -err);
789 		goto fail;
790 	}
791 
792 	return 0;
793 
794 fail:
795 	cancel_delayed_work_sync(&chip->poweroff_work);
796 	return err;
797 }
798 
799 static int tsl2563_remove(struct i2c_client *client)
800 {
801 	struct iio_dev *indio_dev = i2c_get_clientdata(client);
802 	struct tsl2563_chip *chip = iio_priv(indio_dev);
803 
804 	iio_device_unregister(indio_dev);
805 	if (!chip->int_enabled)
806 		cancel_delayed_work(&chip->poweroff_work);
807 	/* Ensure that interrupts are disabled - then flush any bottom halves */
808 	chip->intr &= ~0x30;
809 	i2c_smbus_write_byte_data(chip->client, TSL2563_CMD | TSL2563_REG_INT,
810 				  chip->intr);
811 	flush_scheduled_work();
812 	tsl2563_set_power(chip, 0);
813 
814 	return 0;
815 }
816 
817 #ifdef CONFIG_PM_SLEEP
818 static int tsl2563_suspend(struct device *dev)
819 {
820 	struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
821 	struct tsl2563_chip *chip = iio_priv(indio_dev);
822 	int ret;
823 
824 	mutex_lock(&chip->lock);
825 
826 	ret = tsl2563_set_power(chip, 0);
827 	if (ret)
828 		goto out;
829 
830 	chip->suspended = true;
831 
832 out:
833 	mutex_unlock(&chip->lock);
834 	return ret;
835 }
836 
837 static int tsl2563_resume(struct device *dev)
838 {
839 	struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
840 	struct tsl2563_chip *chip = iio_priv(indio_dev);
841 	int ret;
842 
843 	mutex_lock(&chip->lock);
844 
845 	ret = tsl2563_set_power(chip, 1);
846 	if (ret)
847 		goto out;
848 
849 	ret = tsl2563_configure(chip);
850 	if (ret)
851 		goto out;
852 
853 	chip->suspended = false;
854 
855 out:
856 	mutex_unlock(&chip->lock);
857 	return ret;
858 }
859 
860 static SIMPLE_DEV_PM_OPS(tsl2563_pm_ops, tsl2563_suspend, tsl2563_resume);
861 #define TSL2563_PM_OPS (&tsl2563_pm_ops)
862 #else
863 #define TSL2563_PM_OPS NULL
864 #endif
865 
866 static const struct i2c_device_id tsl2563_id[] = {
867 	{ "tsl2560", 0 },
868 	{ "tsl2561", 1 },
869 	{ "tsl2562", 2 },
870 	{ "tsl2563", 3 },
871 	{}
872 };
873 MODULE_DEVICE_TABLE(i2c, tsl2563_id);
874 
875 static const struct of_device_id tsl2563_of_match[] = {
876 	{ .compatible = "amstaos,tsl2560" },
877 	{ .compatible = "amstaos,tsl2561" },
878 	{ .compatible = "amstaos,tsl2562" },
879 	{ .compatible = "amstaos,tsl2563" },
880 	{}
881 };
882 MODULE_DEVICE_TABLE(of, tsl2563_of_match);
883 
884 static struct i2c_driver tsl2563_i2c_driver = {
885 	.driver = {
886 		.name	 = "tsl2563",
887 		.of_match_table = tsl2563_of_match,
888 		.pm	= TSL2563_PM_OPS,
889 	},
890 	.probe		= tsl2563_probe,
891 	.remove		= tsl2563_remove,
892 	.id_table	= tsl2563_id,
893 };
894 module_i2c_driver(tsl2563_i2c_driver);
895 
896 MODULE_AUTHOR("Nokia Corporation");
897 MODULE_DESCRIPTION("tsl2563 light sensor driver");
898 MODULE_LICENSE("GPL");
899