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/bits.h>
15 #include <linux/delay.h>
16 #include <linux/err.h>
17 #include <linux/i2c.h>
18 #include <linux/interrupt.h>
19 #include <linux/irq.h>
20 #include <linux/math.h>
21 #include <linux/mod_devicetable.h>
22 #include <linux/module.h>
23 #include <linux/mutex.h>
24 #include <linux/pm.h>
25 #include <linux/property.h>
26 #include <linux/sched.h>
27 #include <linux/slab.h>
28
29 #include <linux/iio/events.h>
30 #include <linux/iio/iio.h>
31 #include <linux/iio/sysfs.h>
32
33 /* Use this many bits for fraction part. */
34 #define ADC_FRAC_BITS 14
35
36 /* Given number of 1/10000's in ADC_FRAC_BITS precision. */
37 #define FRAC10K(f) (((f) * BIT(ADC_FRAC_BITS)) / (10000))
38
39 /* Bits used for fraction in calibration coefficients.*/
40 #define CALIB_FRAC_BITS 10
41 /* Decimal 10^(digits in sysfs presentation) */
42 #define CALIB_BASE_SYSFS 1000
43
44 #define TSL2563_CMD BIT(7)
45 #define TSL2563_CLEARINT BIT(6)
46
47 #define TSL2563_REG_CTRL 0x00
48 #define TSL2563_REG_TIMING 0x01
49 #define TSL2563_REG_LOW 0x02 /* data0 low threshold, 2 bytes */
50 #define TSL2563_REG_HIGH 0x04 /* data0 high threshold, 2 bytes */
51 #define TSL2563_REG_INT 0x06
52 #define TSL2563_REG_ID 0x0a
53 #define TSL2563_REG_DATA0 0x0c /* broadband sensor value, 2 bytes */
54 #define TSL2563_REG_DATA1 0x0e /* infrared sensor value, 2 bytes */
55
56 #define TSL2563_CMD_POWER_ON 0x03
57 #define TSL2563_CMD_POWER_OFF 0x00
58 #define TSL2563_CTRL_POWER_MASK GENMASK(1, 0)
59
60 #define TSL2563_TIMING_13MS 0x00
61 #define TSL2563_TIMING_100MS 0x01
62 #define TSL2563_TIMING_400MS 0x02
63 #define TSL2563_TIMING_MASK GENMASK(1, 0)
64 #define TSL2563_TIMING_GAIN16 0x10
65 #define TSL2563_TIMING_GAIN1 0x00
66
67 #define TSL2563_INT_DISABLED 0x00
68 #define TSL2563_INT_LEVEL 0x10
69 #define TSL2563_INT_MASK GENMASK(5, 4)
70 #define TSL2563_INT_PERSIST(n) ((n) & GENMASK(3, 0))
71
72 struct tsl2563_gainlevel_coeff {
73 u8 gaintime;
74 u16 min;
75 u16 max;
76 };
77
78 static const struct tsl2563_gainlevel_coeff tsl2563_gainlevel_table[] = {
79 {
80 .gaintime = TSL2563_TIMING_400MS | TSL2563_TIMING_GAIN16,
81 .min = 0,
82 .max = 65534,
83 }, {
84 .gaintime = TSL2563_TIMING_400MS | TSL2563_TIMING_GAIN1,
85 .min = 2048,
86 .max = 65534,
87 }, {
88 .gaintime = TSL2563_TIMING_100MS | TSL2563_TIMING_GAIN1,
89 .min = 4095,
90 .max = 37177,
91 }, {
92 .gaintime = TSL2563_TIMING_13MS | TSL2563_TIMING_GAIN1,
93 .min = 3000,
94 .max = 65535,
95 },
96 };
97
98 struct tsl2563_chip {
99 struct mutex lock;
100 struct i2c_client *client;
101 struct delayed_work poweroff_work;
102
103 /* Remember state for suspend and resume functions */
104 bool suspended;
105
106 struct tsl2563_gainlevel_coeff const *gainlevel;
107
108 u16 low_thres;
109 u16 high_thres;
110 u8 intr;
111 bool int_enabled;
112
113 /* Calibration coefficients */
114 u32 calib0;
115 u32 calib1;
116 int cover_comp_gain;
117
118 /* Cache current values, to be returned while suspended */
119 u32 data0;
120 u32 data1;
121 };
122
tsl2563_set_power(struct tsl2563_chip * chip,int on)123 static int tsl2563_set_power(struct tsl2563_chip *chip, int on)
124 {
125 struct i2c_client *client = chip->client;
126 u8 cmd;
127
128 cmd = on ? TSL2563_CMD_POWER_ON : TSL2563_CMD_POWER_OFF;
129 return i2c_smbus_write_byte_data(client,
130 TSL2563_CMD | TSL2563_REG_CTRL, cmd);
131 }
132
133 /*
134 * Return value is 0 for off, 1 for on, or a negative error
135 * code if reading failed.
136 */
tsl2563_get_power(struct tsl2563_chip * chip)137 static int tsl2563_get_power(struct tsl2563_chip *chip)
138 {
139 struct i2c_client *client = chip->client;
140 int ret;
141
142 ret = i2c_smbus_read_byte_data(client, TSL2563_CMD | TSL2563_REG_CTRL);
143 if (ret < 0)
144 return ret;
145
146 return (ret & TSL2563_CTRL_POWER_MASK) == TSL2563_CMD_POWER_ON;
147 }
148
tsl2563_configure(struct tsl2563_chip * chip)149 static int tsl2563_configure(struct tsl2563_chip *chip)
150 {
151 int ret;
152
153 ret = i2c_smbus_write_byte_data(chip->client,
154 TSL2563_CMD | TSL2563_REG_TIMING,
155 chip->gainlevel->gaintime);
156 if (ret)
157 goto error_ret;
158 ret = i2c_smbus_write_word_data(chip->client,
159 TSL2563_CMD | TSL2563_REG_HIGH,
160 chip->high_thres);
161 if (ret)
162 goto error_ret;
163 ret = i2c_smbus_write_word_data(chip->client,
164 TSL2563_CMD | TSL2563_REG_LOW,
165 chip->low_thres);
166 if (ret)
167 goto error_ret;
168 /*
169 * Interrupt register is automatically written anyway if it is relevant
170 * so is not here.
171 */
172 error_ret:
173 return ret;
174 }
175
tsl2563_poweroff_work(struct work_struct * work)176 static void tsl2563_poweroff_work(struct work_struct *work)
177 {
178 struct tsl2563_chip *chip =
179 container_of(work, struct tsl2563_chip, poweroff_work.work);
180 tsl2563_set_power(chip, 0);
181 }
182
tsl2563_detect(struct tsl2563_chip * chip)183 static int tsl2563_detect(struct tsl2563_chip *chip)
184 {
185 int ret;
186
187 ret = tsl2563_set_power(chip, 1);
188 if (ret)
189 return ret;
190
191 ret = tsl2563_get_power(chip);
192 if (ret < 0)
193 return ret;
194
195 return ret ? 0 : -ENODEV;
196 }
197
tsl2563_read_id(struct tsl2563_chip * chip,u8 * id)198 static int tsl2563_read_id(struct tsl2563_chip *chip, u8 *id)
199 {
200 struct i2c_client *client = chip->client;
201 int ret;
202
203 ret = i2c_smbus_read_byte_data(client, TSL2563_CMD | TSL2563_REG_ID);
204 if (ret < 0)
205 return ret;
206
207 *id = ret;
208
209 return 0;
210 }
211
tsl2563_configure_irq(struct tsl2563_chip * chip,bool enable)212 static int tsl2563_configure_irq(struct tsl2563_chip *chip, bool enable)
213 {
214 int ret;
215
216 chip->intr &= ~TSL2563_INT_MASK;
217 if (enable)
218 chip->intr |= TSL2563_INT_LEVEL;
219
220 ret = i2c_smbus_write_byte_data(chip->client,
221 TSL2563_CMD | TSL2563_REG_INT,
222 chip->intr);
223 if (ret < 0)
224 return ret;
225
226 chip->int_enabled = enable;
227 return 0;
228 }
229
230 /*
231 * "Normalized" ADC value is one obtained with 400ms of integration time and
232 * 16x gain. This function returns the number of bits of shift needed to
233 * convert between normalized values and HW values obtained using given
234 * timing and gain settings.
235 */
tsl2563_adc_shiftbits(u8 timing)236 static int tsl2563_adc_shiftbits(u8 timing)
237 {
238 int shift = 0;
239
240 switch (timing & TSL2563_TIMING_MASK) {
241 case TSL2563_TIMING_13MS:
242 shift += 5;
243 break;
244 case TSL2563_TIMING_100MS:
245 shift += 2;
246 break;
247 case TSL2563_TIMING_400MS:
248 /* no-op */
249 break;
250 }
251
252 if (!(timing & TSL2563_TIMING_GAIN16))
253 shift += 4;
254
255 return shift;
256 }
257
258 /* Convert a HW ADC value to normalized scale. */
tsl2563_normalize_adc(u16 adc,u8 timing)259 static u32 tsl2563_normalize_adc(u16 adc, u8 timing)
260 {
261 return adc << tsl2563_adc_shiftbits(timing);
262 }
263
tsl2563_wait_adc(struct tsl2563_chip * chip)264 static void tsl2563_wait_adc(struct tsl2563_chip *chip)
265 {
266 unsigned int delay;
267
268 switch (chip->gainlevel->gaintime & TSL2563_TIMING_MASK) {
269 case TSL2563_TIMING_13MS:
270 delay = 14;
271 break;
272 case TSL2563_TIMING_100MS:
273 delay = 101;
274 break;
275 default:
276 delay = 402;
277 }
278 /*
279 * TODO: Make sure that we wait at least required delay but why we
280 * have to extend it one tick more?
281 */
282 schedule_timeout_interruptible(msecs_to_jiffies(delay) + 2);
283 }
284
tsl2563_adjust_gainlevel(struct tsl2563_chip * chip,u16 adc)285 static int tsl2563_adjust_gainlevel(struct tsl2563_chip *chip, u16 adc)
286 {
287 struct i2c_client *client = chip->client;
288
289 if (adc > chip->gainlevel->max || adc < chip->gainlevel->min) {
290
291 (adc > chip->gainlevel->max) ?
292 chip->gainlevel++ : chip->gainlevel--;
293
294 i2c_smbus_write_byte_data(client,
295 TSL2563_CMD | TSL2563_REG_TIMING,
296 chip->gainlevel->gaintime);
297
298 tsl2563_wait_adc(chip);
299 tsl2563_wait_adc(chip);
300
301 return 1;
302 } else
303 return 0;
304 }
305
tsl2563_get_adc(struct tsl2563_chip * chip)306 static int tsl2563_get_adc(struct tsl2563_chip *chip)
307 {
308 struct i2c_client *client = chip->client;
309 u16 adc0, adc1;
310 int retry = 1;
311 int ret = 0;
312
313 if (chip->suspended)
314 goto out;
315
316 if (!chip->int_enabled) {
317 cancel_delayed_work_sync(&chip->poweroff_work);
318
319 if (!tsl2563_get_power(chip)) {
320 ret = tsl2563_set_power(chip, 1);
321 if (ret)
322 goto out;
323 ret = tsl2563_configure(chip);
324 if (ret)
325 goto out;
326 tsl2563_wait_adc(chip);
327 }
328 }
329
330 while (retry) {
331 ret = i2c_smbus_read_word_data(client,
332 TSL2563_CMD | TSL2563_REG_DATA0);
333 if (ret < 0)
334 goto out;
335 adc0 = ret;
336
337 ret = i2c_smbus_read_word_data(client,
338 TSL2563_CMD | TSL2563_REG_DATA1);
339 if (ret < 0)
340 goto out;
341 adc1 = ret;
342
343 retry = tsl2563_adjust_gainlevel(chip, adc0);
344 }
345
346 chip->data0 = tsl2563_normalize_adc(adc0, chip->gainlevel->gaintime);
347 chip->data1 = tsl2563_normalize_adc(adc1, chip->gainlevel->gaintime);
348
349 if (!chip->int_enabled)
350 schedule_delayed_work(&chip->poweroff_work, 5 * HZ);
351
352 ret = 0;
353 out:
354 return ret;
355 }
356
tsl2563_calib_to_sysfs(u32 calib)357 static inline int tsl2563_calib_to_sysfs(u32 calib)
358 {
359 return (int)DIV_ROUND_CLOSEST(calib * CALIB_BASE_SYSFS, BIT(CALIB_FRAC_BITS));
360 }
361
tsl2563_calib_from_sysfs(int value)362 static inline u32 tsl2563_calib_from_sysfs(int value)
363 {
364 /* Make a fraction from a number n that was multiplied with b. */
365 return (((u32) value) << CALIB_FRAC_BITS) / CALIB_BASE_SYSFS;
366 }
367
368 /*
369 * Conversions between lux and ADC values.
370 *
371 * The basic formula is lux = c0 * adc0 - c1 * adc1, where c0 and c1 are
372 * appropriate constants. Different constants are needed for different
373 * kinds of light, determined by the ratio adc1/adc0 (basically the ratio
374 * of the intensities in infrared and visible wavelengths). lux_table below
375 * lists the upper threshold of the adc1/adc0 ratio and the corresponding
376 * constants.
377 */
378
379 struct tsl2563_lux_coeff {
380 unsigned long ch_ratio;
381 unsigned long ch0_coeff;
382 unsigned long ch1_coeff;
383 };
384
385 static const struct tsl2563_lux_coeff lux_table[] = {
386 {
387 .ch_ratio = FRAC10K(1300),
388 .ch0_coeff = FRAC10K(315),
389 .ch1_coeff = FRAC10K(262),
390 }, {
391 .ch_ratio = FRAC10K(2600),
392 .ch0_coeff = FRAC10K(337),
393 .ch1_coeff = FRAC10K(430),
394 }, {
395 .ch_ratio = FRAC10K(3900),
396 .ch0_coeff = FRAC10K(363),
397 .ch1_coeff = FRAC10K(529),
398 }, {
399 .ch_ratio = FRAC10K(5200),
400 .ch0_coeff = FRAC10K(392),
401 .ch1_coeff = FRAC10K(605),
402 }, {
403 .ch_ratio = FRAC10K(6500),
404 .ch0_coeff = FRAC10K(229),
405 .ch1_coeff = FRAC10K(291),
406 }, {
407 .ch_ratio = FRAC10K(8000),
408 .ch0_coeff = FRAC10K(157),
409 .ch1_coeff = FRAC10K(180),
410 }, {
411 .ch_ratio = FRAC10K(13000),
412 .ch0_coeff = FRAC10K(34),
413 .ch1_coeff = FRAC10K(26),
414 }, {
415 .ch_ratio = ULONG_MAX,
416 .ch0_coeff = 0,
417 .ch1_coeff = 0,
418 },
419 };
420
421 /* Convert normalized, scaled ADC values to lux. */
tsl2563_adc_to_lux(u32 adc0,u32 adc1)422 static unsigned int tsl2563_adc_to_lux(u32 adc0, u32 adc1)
423 {
424 const struct tsl2563_lux_coeff *lp = lux_table;
425 unsigned long ratio, lux, ch0 = adc0, ch1 = adc1;
426
427 ratio = ch0 ? ((ch1 << ADC_FRAC_BITS) / ch0) : ULONG_MAX;
428
429 while (lp->ch_ratio < ratio)
430 lp++;
431
432 lux = ch0 * lp->ch0_coeff - ch1 * lp->ch1_coeff;
433
434 return (unsigned int) (lux >> ADC_FRAC_BITS);
435 }
436
437 /* Apply calibration coefficient to ADC count. */
tsl2563_calib_adc(u32 adc,u32 calib)438 static u32 tsl2563_calib_adc(u32 adc, u32 calib)
439 {
440 unsigned long scaled = adc;
441
442 scaled *= calib;
443 scaled >>= CALIB_FRAC_BITS;
444
445 return (u32) scaled;
446 }
447
tsl2563_write_raw(struct iio_dev * indio_dev,struct iio_chan_spec const * chan,int val,int val2,long mask)448 static int tsl2563_write_raw(struct iio_dev *indio_dev,
449 struct iio_chan_spec const *chan,
450 int val,
451 int val2,
452 long mask)
453 {
454 struct tsl2563_chip *chip = iio_priv(indio_dev);
455
456 if (mask != IIO_CHAN_INFO_CALIBSCALE)
457 return -EINVAL;
458 if (chan->channel2 == IIO_MOD_LIGHT_BOTH)
459 chip->calib0 = tsl2563_calib_from_sysfs(val);
460 else if (chan->channel2 == IIO_MOD_LIGHT_IR)
461 chip->calib1 = tsl2563_calib_from_sysfs(val);
462 else
463 return -EINVAL;
464
465 return 0;
466 }
467
tsl2563_read_raw(struct iio_dev * indio_dev,struct iio_chan_spec const * chan,int * val,int * val2,long mask)468 static int tsl2563_read_raw(struct iio_dev *indio_dev,
469 struct iio_chan_spec const *chan,
470 int *val,
471 int *val2,
472 long mask)
473 {
474 int ret = -EINVAL;
475 u32 calib0, calib1;
476 struct tsl2563_chip *chip = iio_priv(indio_dev);
477
478 mutex_lock(&chip->lock);
479 switch (mask) {
480 case IIO_CHAN_INFO_RAW:
481 case IIO_CHAN_INFO_PROCESSED:
482 switch (chan->type) {
483 case IIO_LIGHT:
484 ret = tsl2563_get_adc(chip);
485 if (ret)
486 goto error_ret;
487 calib0 = tsl2563_calib_adc(chip->data0, chip->calib0) *
488 chip->cover_comp_gain;
489 calib1 = tsl2563_calib_adc(chip->data1, chip->calib1) *
490 chip->cover_comp_gain;
491 *val = tsl2563_adc_to_lux(calib0, calib1);
492 ret = IIO_VAL_INT;
493 break;
494 case IIO_INTENSITY:
495 ret = tsl2563_get_adc(chip);
496 if (ret)
497 goto error_ret;
498 if (chan->channel2 == IIO_MOD_LIGHT_BOTH)
499 *val = chip->data0;
500 else
501 *val = chip->data1;
502 ret = IIO_VAL_INT;
503 break;
504 default:
505 break;
506 }
507 break;
508
509 case IIO_CHAN_INFO_CALIBSCALE:
510 if (chan->channel2 == IIO_MOD_LIGHT_BOTH)
511 *val = tsl2563_calib_to_sysfs(chip->calib0);
512 else
513 *val = tsl2563_calib_to_sysfs(chip->calib1);
514 ret = IIO_VAL_INT;
515 break;
516 default:
517 ret = -EINVAL;
518 goto error_ret;
519 }
520
521 error_ret:
522 mutex_unlock(&chip->lock);
523 return ret;
524 }
525
526 static const struct iio_event_spec tsl2563_events[] = {
527 {
528 .type = IIO_EV_TYPE_THRESH,
529 .dir = IIO_EV_DIR_RISING,
530 .mask_separate = BIT(IIO_EV_INFO_VALUE) |
531 BIT(IIO_EV_INFO_ENABLE),
532 }, {
533 .type = IIO_EV_TYPE_THRESH,
534 .dir = IIO_EV_DIR_FALLING,
535 .mask_separate = BIT(IIO_EV_INFO_VALUE) |
536 BIT(IIO_EV_INFO_ENABLE),
537 },
538 };
539
540 static const struct iio_chan_spec tsl2563_channels[] = {
541 {
542 .type = IIO_LIGHT,
543 .indexed = 1,
544 .info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED),
545 .channel = 0,
546 }, {
547 .type = IIO_INTENSITY,
548 .modified = 1,
549 .channel2 = IIO_MOD_LIGHT_BOTH,
550 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
551 BIT(IIO_CHAN_INFO_CALIBSCALE),
552 .event_spec = tsl2563_events,
553 .num_event_specs = ARRAY_SIZE(tsl2563_events),
554 }, {
555 .type = IIO_INTENSITY,
556 .modified = 1,
557 .channel2 = IIO_MOD_LIGHT_IR,
558 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
559 BIT(IIO_CHAN_INFO_CALIBSCALE),
560 }
561 };
562
tsl2563_read_thresh(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)563 static int tsl2563_read_thresh(struct iio_dev *indio_dev,
564 const struct iio_chan_spec *chan, enum iio_event_type type,
565 enum iio_event_direction dir, enum iio_event_info info, int *val,
566 int *val2)
567 {
568 struct tsl2563_chip *chip = iio_priv(indio_dev);
569
570 switch (dir) {
571 case IIO_EV_DIR_RISING:
572 *val = chip->high_thres;
573 break;
574 case IIO_EV_DIR_FALLING:
575 *val = chip->low_thres;
576 break;
577 default:
578 return -EINVAL;
579 }
580
581 return IIO_VAL_INT;
582 }
583
tsl2563_write_thresh(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)584 static int tsl2563_write_thresh(struct iio_dev *indio_dev,
585 const struct iio_chan_spec *chan, enum iio_event_type type,
586 enum iio_event_direction dir, enum iio_event_info info, int val,
587 int val2)
588 {
589 struct tsl2563_chip *chip = iio_priv(indio_dev);
590 int ret;
591
592 mutex_lock(&chip->lock);
593
594 if (dir == IIO_EV_DIR_RISING)
595 ret = i2c_smbus_write_word_data(chip->client,
596 TSL2563_CMD | TSL2563_REG_HIGH, val);
597 else
598 ret = i2c_smbus_write_word_data(chip->client,
599 TSL2563_CMD | TSL2563_REG_LOW, val);
600 if (ret)
601 goto error_ret;
602
603 if (dir == IIO_EV_DIR_RISING)
604 chip->high_thres = val;
605 else
606 chip->low_thres = val;
607
608 error_ret:
609 mutex_unlock(&chip->lock);
610
611 return ret;
612 }
613
tsl2563_event_handler(int irq,void * private)614 static irqreturn_t tsl2563_event_handler(int irq, void *private)
615 {
616 struct iio_dev *dev_info = private;
617 struct tsl2563_chip *chip = iio_priv(dev_info);
618
619 iio_push_event(dev_info,
620 IIO_UNMOD_EVENT_CODE(IIO_INTENSITY,
621 0,
622 IIO_EV_TYPE_THRESH,
623 IIO_EV_DIR_EITHER),
624 iio_get_time_ns(dev_info));
625
626 /* clear the interrupt and push the event */
627 i2c_smbus_write_byte(chip->client, TSL2563_CMD | TSL2563_CLEARINT);
628 return IRQ_HANDLED;
629 }
630
tsl2563_write_interrupt_config(struct iio_dev * indio_dev,const struct iio_chan_spec * chan,enum iio_event_type type,enum iio_event_direction dir,int state)631 static int tsl2563_write_interrupt_config(struct iio_dev *indio_dev,
632 const struct iio_chan_spec *chan, enum iio_event_type type,
633 enum iio_event_direction dir, int state)
634 {
635 struct tsl2563_chip *chip = iio_priv(indio_dev);
636 int ret = 0;
637
638 mutex_lock(&chip->lock);
639 if (state && !(chip->intr & TSL2563_INT_MASK)) {
640 /* ensure the chip is actually on */
641 cancel_delayed_work_sync(&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 = tsl2563_configure_irq(chip, true);
651 }
652
653 if (!state && (chip->intr & TSL2563_INT_MASK)) {
654 ret = tsl2563_configure_irq(chip, false);
655 /* now the interrupt is not enabled, we can go to sleep */
656 schedule_delayed_work(&chip->poweroff_work, 5 * HZ);
657 }
658 out:
659 mutex_unlock(&chip->lock);
660
661 return ret;
662 }
663
tsl2563_read_interrupt_config(struct iio_dev * indio_dev,const struct iio_chan_spec * chan,enum iio_event_type type,enum iio_event_direction dir)664 static int tsl2563_read_interrupt_config(struct iio_dev *indio_dev,
665 const struct iio_chan_spec *chan, enum iio_event_type type,
666 enum iio_event_direction dir)
667 {
668 struct tsl2563_chip *chip = iio_priv(indio_dev);
669 int ret;
670
671 mutex_lock(&chip->lock);
672 ret = i2c_smbus_read_byte_data(chip->client,
673 TSL2563_CMD | TSL2563_REG_INT);
674 mutex_unlock(&chip->lock);
675 if (ret < 0)
676 return ret;
677
678 return !!(ret & TSL2563_INT_MASK);
679 }
680
681 static const struct iio_info tsl2563_info_no_irq = {
682 .read_raw = &tsl2563_read_raw,
683 .write_raw = &tsl2563_write_raw,
684 };
685
686 static const struct iio_info tsl2563_info = {
687 .read_raw = &tsl2563_read_raw,
688 .write_raw = &tsl2563_write_raw,
689 .read_event_value = &tsl2563_read_thresh,
690 .write_event_value = &tsl2563_write_thresh,
691 .read_event_config = &tsl2563_read_interrupt_config,
692 .write_event_config = &tsl2563_write_interrupt_config,
693 };
694
tsl2563_probe(struct i2c_client * client)695 static int tsl2563_probe(struct i2c_client *client)
696 {
697 struct device *dev = &client->dev;
698 struct iio_dev *indio_dev;
699 struct tsl2563_chip *chip;
700 unsigned long irq_flags;
701 u8 id = 0;
702 int err;
703
704 indio_dev = devm_iio_device_alloc(dev, sizeof(*chip));
705 if (!indio_dev)
706 return -ENOMEM;
707
708 chip = iio_priv(indio_dev);
709
710 i2c_set_clientdata(client, indio_dev);
711 chip->client = client;
712
713 err = tsl2563_detect(chip);
714 if (err)
715 return dev_err_probe(dev, err, "detect error\n");
716
717 err = tsl2563_read_id(chip, &id);
718 if (err)
719 return dev_err_probe(dev, err, "read id error\n");
720
721 mutex_init(&chip->lock);
722
723 /* Default values used until userspace says otherwise */
724 chip->low_thres = 0x0;
725 chip->high_thres = 0xffff;
726 chip->gainlevel = tsl2563_gainlevel_table;
727 chip->intr = TSL2563_INT_PERSIST(4);
728 chip->calib0 = tsl2563_calib_from_sysfs(CALIB_BASE_SYSFS);
729 chip->calib1 = tsl2563_calib_from_sysfs(CALIB_BASE_SYSFS);
730
731 chip->cover_comp_gain = 1;
732 device_property_read_u32(dev, "amstaos,cover-comp-gain", &chip->cover_comp_gain);
733
734 dev_info(dev, "model %d, rev. %d\n", id >> 4, id & 0x0f);
735 indio_dev->name = client->name;
736 indio_dev->channels = tsl2563_channels;
737 indio_dev->num_channels = ARRAY_SIZE(tsl2563_channels);
738 indio_dev->modes = INDIO_DIRECT_MODE;
739
740 if (client->irq)
741 indio_dev->info = &tsl2563_info;
742 else
743 indio_dev->info = &tsl2563_info_no_irq;
744
745 if (client->irq) {
746 irq_flags = irq_get_trigger_type(client->irq);
747 if (irq_flags == IRQF_TRIGGER_NONE)
748 irq_flags = IRQF_TRIGGER_RISING;
749 irq_flags |= IRQF_ONESHOT;
750
751 err = devm_request_threaded_irq(dev, client->irq,
752 NULL,
753 &tsl2563_event_handler,
754 irq_flags,
755 "tsl2563_event",
756 indio_dev);
757 if (err)
758 return dev_err_probe(dev, err, "irq request error\n");
759 }
760
761 err = tsl2563_configure(chip);
762 if (err)
763 return dev_err_probe(dev, err, "configure error\n");
764
765 INIT_DELAYED_WORK(&chip->poweroff_work, tsl2563_poweroff_work);
766
767 /* The interrupt cannot yet be enabled so this is fine without lock */
768 schedule_delayed_work(&chip->poweroff_work, 5 * HZ);
769
770 err = iio_device_register(indio_dev);
771 if (err) {
772 dev_err_probe(dev, err, "iio registration error\n");
773 goto fail;
774 }
775
776 return 0;
777
778 fail:
779 cancel_delayed_work_sync(&chip->poweroff_work);
780 return err;
781 }
782
tsl2563_remove(struct i2c_client * client)783 static void tsl2563_remove(struct i2c_client *client)
784 {
785 struct iio_dev *indio_dev = i2c_get_clientdata(client);
786 struct tsl2563_chip *chip = iio_priv(indio_dev);
787
788 iio_device_unregister(indio_dev);
789 if (!chip->int_enabled)
790 cancel_delayed_work_sync(&chip->poweroff_work);
791 /* Ensure that interrupts are disabled - then flush any bottom halves */
792 tsl2563_configure_irq(chip, false);
793 tsl2563_set_power(chip, 0);
794 }
795
tsl2563_suspend(struct device * dev)796 static int tsl2563_suspend(struct device *dev)
797 {
798 struct iio_dev *indio_dev = dev_get_drvdata(dev);
799 struct tsl2563_chip *chip = iio_priv(indio_dev);
800 int ret;
801
802 mutex_lock(&chip->lock);
803
804 ret = tsl2563_set_power(chip, 0);
805 if (ret)
806 goto out;
807
808 chip->suspended = true;
809
810 out:
811 mutex_unlock(&chip->lock);
812 return ret;
813 }
814
tsl2563_resume(struct device * dev)815 static int tsl2563_resume(struct device *dev)
816 {
817 struct iio_dev *indio_dev = dev_get_drvdata(dev);
818 struct tsl2563_chip *chip = iio_priv(indio_dev);
819 int ret;
820
821 mutex_lock(&chip->lock);
822
823 ret = tsl2563_set_power(chip, 1);
824 if (ret)
825 goto out;
826
827 ret = tsl2563_configure(chip);
828 if (ret)
829 goto out;
830
831 chip->suspended = false;
832
833 out:
834 mutex_unlock(&chip->lock);
835 return ret;
836 }
837
838 static DEFINE_SIMPLE_DEV_PM_OPS(tsl2563_pm_ops, tsl2563_suspend,
839 tsl2563_resume);
840
841 static const struct i2c_device_id tsl2563_id[] = {
842 { "tsl2560", 0 },
843 { "tsl2561", 1 },
844 { "tsl2562", 2 },
845 { "tsl2563", 3 },
846 {}
847 };
848 MODULE_DEVICE_TABLE(i2c, tsl2563_id);
849
850 static const struct of_device_id tsl2563_of_match[] = {
851 { .compatible = "amstaos,tsl2560" },
852 { .compatible = "amstaos,tsl2561" },
853 { .compatible = "amstaos,tsl2562" },
854 { .compatible = "amstaos,tsl2563" },
855 {}
856 };
857 MODULE_DEVICE_TABLE(of, tsl2563_of_match);
858
859 static struct i2c_driver tsl2563_i2c_driver = {
860 .driver = {
861 .name = "tsl2563",
862 .of_match_table = tsl2563_of_match,
863 .pm = pm_sleep_ptr(&tsl2563_pm_ops),
864 },
865 .probe = tsl2563_probe,
866 .remove = tsl2563_remove,
867 .id_table = tsl2563_id,
868 };
869 module_i2c_driver(tsl2563_i2c_driver);
870
871 MODULE_AUTHOR("Nokia Corporation");
872 MODULE_DESCRIPTION("tsl2563 light sensor driver");
873 MODULE_LICENSE("GPL");
874