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authorJonathan Cameron <jic23@kernel.org>2013-01-12 05:35:00 -0500
committerJonathan Cameron <jic23@kernel.org>2013-01-27 12:37:24 -0500
commit9c2251dd4b7feba14d35835c6835024840b1f76b (patch)
tree5f0ce5da5d55d02379f23b9eff0314f7cb595c38 /drivers/iio/light/tsl2563.c
parentaf0b8ee32c831e6e8fbfe0b311b9ac017d14b78d (diff)
iio:light:tsl2563 move out of staging
This driver is simple, uses the latest interfaces and contains few if any controversial elements. All of its interfaces have been in place for a long time now. Hence let's move it out of staging. Signed-off-by: Jonathan Cameron <jic23@kernel.org> Acked-by: Peter Meerwald <pmeerw@pmeerw.net>
Diffstat (limited to 'drivers/iio/light/tsl2563.c')
-rw-r--r--drivers/iio/light/tsl2563.c887
1 files changed, 887 insertions, 0 deletions
diff --git a/drivers/iio/light/tsl2563.c b/drivers/iio/light/tsl2563.c
new file mode 100644
index 000000000000..fd8be69b7d05
--- /dev/null
+++ b/drivers/iio/light/tsl2563.c
@@ -0,0 +1,887 @@
1/*
2 * drivers/iio/light/tsl2563.c
3 *
4 * Copyright (C) 2008 Nokia Corporation
5 *
6 * Written by Timo O. Karjalainen <timo.o.karjalainen@nokia.com>
7 * Contact: Amit Kucheria <amit.kucheria@verdurent.com>
8 *
9 * Converted to IIO driver
10 * Amit Kucheria <amit.kucheria@verdurent.com>
11 *
12 * This program is free software; you can redistribute it and/or
13 * modify it under the terms of the GNU General Public License
14 * version 2 as published by the Free Software Foundation.
15 *
16 * This program is distributed in the hope that it will be useful, but
17 * WITHOUT ANY WARRANTY; without even the implied warranty of
18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
19 * General Public License for more details.
20 *
21 * You should have received a copy of the GNU General Public License
22 * along with this program; if not, write to the Free Software
23 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
24 * 02110-1301 USA
25 */
26
27#include <linux/module.h>
28#include <linux/i2c.h>
29#include <linux/interrupt.h>
30#include <linux/irq.h>
31#include <linux/sched.h>
32#include <linux/mutex.h>
33#include <linux/delay.h>
34#include <linux/pm.h>
35#include <linux/err.h>
36#include <linux/slab.h>
37
38#include <linux/iio/iio.h>
39#include <linux/iio/sysfs.h>
40#include <linux/iio/events.h>
41#include <linux/platform_data/tsl2563.h>
42
43/* Use this many bits for fraction part. */
44#define ADC_FRAC_BITS 14
45
46/* Given number of 1/10000's in ADC_FRAC_BITS precision. */
47#define FRAC10K(f) (((f) * (1L << (ADC_FRAC_BITS))) / (10000))
48
49/* Bits used for fraction in calibration coefficients.*/
50#define CALIB_FRAC_BITS 10
51/* 0.5 in CALIB_FRAC_BITS precision */
52#define CALIB_FRAC_HALF (1 << (CALIB_FRAC_BITS - 1))
53/* Make a fraction from a number n that was multiplied with b. */
54#define CALIB_FRAC(n, b) (((n) << CALIB_FRAC_BITS) / (b))
55/* Decimal 10^(digits in sysfs presentation) */
56#define CALIB_BASE_SYSFS 1000
57
58#define TSL2563_CMD 0x80
59#define TSL2563_CLEARINT 0x40
60
61#define TSL2563_REG_CTRL 0x00
62#define TSL2563_REG_TIMING 0x01
63#define TSL2563_REG_LOWLOW 0x02 /* data0 low threshold, 2 bytes */
64#define TSL2563_REG_LOWHIGH 0x03
65#define TSL2563_REG_HIGHLOW 0x04 /* data0 high threshold, 2 bytes */
66#define TSL2563_REG_HIGHHIGH 0x05
67#define TSL2563_REG_INT 0x06
68#define TSL2563_REG_ID 0x0a
69#define TSL2563_REG_DATA0LOW 0x0c /* broadband sensor value, 2 bytes */
70#define TSL2563_REG_DATA0HIGH 0x0d
71#define TSL2563_REG_DATA1LOW 0x0e /* infrared sensor value, 2 bytes */
72#define TSL2563_REG_DATA1HIGH 0x0f
73
74#define TSL2563_CMD_POWER_ON 0x03
75#define TSL2563_CMD_POWER_OFF 0x00
76#define TSL2563_CTRL_POWER_MASK 0x03
77
78#define TSL2563_TIMING_13MS 0x00
79#define TSL2563_TIMING_100MS 0x01
80#define TSL2563_TIMING_400MS 0x02
81#define TSL2563_TIMING_MASK 0x03
82#define TSL2563_TIMING_GAIN16 0x10
83#define TSL2563_TIMING_GAIN1 0x00
84
85#define TSL2563_INT_DISBLED 0x00
86#define TSL2563_INT_LEVEL 0x10
87#define TSL2563_INT_PERSIST(n) ((n) & 0x0F)
88
89struct tsl2563_gainlevel_coeff {
90 u8 gaintime;
91 u16 min;
92 u16 max;
93};
94
95static const struct tsl2563_gainlevel_coeff tsl2563_gainlevel_table[] = {
96 {
97 .gaintime = TSL2563_TIMING_400MS | TSL2563_TIMING_GAIN16,
98 .min = 0,
99 .max = 65534,
100 }, {
101 .gaintime = TSL2563_TIMING_400MS | TSL2563_TIMING_GAIN1,
102 .min = 2048,
103 .max = 65534,
104 }, {
105 .gaintime = TSL2563_TIMING_100MS | TSL2563_TIMING_GAIN1,
106 .min = 4095,
107 .max = 37177,
108 }, {
109 .gaintime = TSL2563_TIMING_13MS | TSL2563_TIMING_GAIN1,
110 .min = 3000,
111 .max = 65535,
112 },
113};
114
115struct tsl2563_chip {
116 struct mutex lock;
117 struct i2c_client *client;
118 struct delayed_work poweroff_work;
119
120 /* Remember state for suspend and resume functions */
121 bool suspended;
122
123 struct tsl2563_gainlevel_coeff const *gainlevel;
124
125 u16 low_thres;
126 u16 high_thres;
127 u8 intr;
128 bool int_enabled;
129
130 /* Calibration coefficients */
131 u32 calib0;
132 u32 calib1;
133 int cover_comp_gain;
134
135 /* Cache current values, to be returned while suspended */
136 u32 data0;
137 u32 data1;
138};
139
140static int tsl2563_set_power(struct tsl2563_chip *chip, int on)
141{
142 struct i2c_client *client = chip->client;
143 u8 cmd;
144
145 cmd = on ? TSL2563_CMD_POWER_ON : TSL2563_CMD_POWER_OFF;
146 return i2c_smbus_write_byte_data(client,
147 TSL2563_CMD | TSL2563_REG_CTRL, cmd);
148}
149
150/*
151 * Return value is 0 for off, 1 for on, or a negative error
152 * code if reading failed.
153 */
154static int tsl2563_get_power(struct tsl2563_chip *chip)
155{
156 struct i2c_client *client = chip->client;
157 int ret;
158
159 ret = i2c_smbus_read_byte_data(client, TSL2563_CMD | TSL2563_REG_CTRL);
160 if (ret < 0)
161 return ret;
162
163 return (ret & TSL2563_CTRL_POWER_MASK) == TSL2563_CMD_POWER_ON;
164}
165
166static int tsl2563_configure(struct tsl2563_chip *chip)
167{
168 int ret;
169
170 ret = i2c_smbus_write_byte_data(chip->client,
171 TSL2563_CMD | TSL2563_REG_TIMING,
172 chip->gainlevel->gaintime);
173 if (ret)
174 goto error_ret;
175 ret = i2c_smbus_write_byte_data(chip->client,
176 TSL2563_CMD | TSL2563_REG_HIGHLOW,
177 chip->high_thres & 0xFF);
178 if (ret)
179 goto error_ret;
180 ret = i2c_smbus_write_byte_data(chip->client,
181 TSL2563_CMD | TSL2563_REG_HIGHHIGH,
182 (chip->high_thres >> 8) & 0xFF);
183 if (ret)
184 goto error_ret;
185 ret = i2c_smbus_write_byte_data(chip->client,
186 TSL2563_CMD | TSL2563_REG_LOWLOW,
187 chip->low_thres & 0xFF);
188 if (ret)
189 goto error_ret;
190 ret = i2c_smbus_write_byte_data(chip->client,
191 TSL2563_CMD | TSL2563_REG_LOWHIGH,
192 (chip->low_thres >> 8) & 0xFF);
193/*
194 * Interrupt register is automatically written anyway if it is relevant
195 * so is not here.
196 */
197error_ret:
198 return ret;
199}
200
201static void tsl2563_poweroff_work(struct work_struct *work)
202{
203 struct tsl2563_chip *chip =
204 container_of(work, struct tsl2563_chip, poweroff_work.work);
205 tsl2563_set_power(chip, 0);
206}
207
208static int tsl2563_detect(struct tsl2563_chip *chip)
209{
210 int ret;
211
212 ret = tsl2563_set_power(chip, 1);
213 if (ret)
214 return ret;
215
216 ret = tsl2563_get_power(chip);
217 if (ret < 0)
218 return ret;
219
220 return ret ? 0 : -ENODEV;
221}
222
223static int tsl2563_read_id(struct tsl2563_chip *chip, u8 *id)
224{
225 struct i2c_client *client = chip->client;
226 int ret;
227
228 ret = i2c_smbus_read_byte_data(client, TSL2563_CMD | TSL2563_REG_ID);
229 if (ret < 0)
230 return ret;
231
232 *id = ret;
233
234 return 0;
235}
236
237/*
238 * "Normalized" ADC value is one obtained with 400ms of integration time and
239 * 16x gain. This function returns the number of bits of shift needed to
240 * convert between normalized values and HW values obtained using given
241 * timing and gain settings.
242 */
243static int adc_shiftbits(u8 timing)
244{
245 int shift = 0;
246
247 switch (timing & TSL2563_TIMING_MASK) {
248 case TSL2563_TIMING_13MS:
249 shift += 5;
250 break;
251 case TSL2563_TIMING_100MS:
252 shift += 2;
253 break;
254 case TSL2563_TIMING_400MS:
255 /* no-op */
256 break;
257 }
258
259 if (!(timing & TSL2563_TIMING_GAIN16))
260 shift += 4;
261
262 return shift;
263}
264
265/* Convert a HW ADC value to normalized scale. */
266static u32 normalize_adc(u16 adc, u8 timing)
267{
268 return adc << adc_shiftbits(timing);
269}
270
271static void tsl2563_wait_adc(struct tsl2563_chip *chip)
272{
273 unsigned int delay;
274
275 switch (chip->gainlevel->gaintime & TSL2563_TIMING_MASK) {
276 case TSL2563_TIMING_13MS:
277 delay = 14;
278 break;
279 case TSL2563_TIMING_100MS:
280 delay = 101;
281 break;
282 default:
283 delay = 402;
284 }
285 /*
286 * TODO: Make sure that we wait at least required delay but why we
287 * have to extend it one tick more?
288 */
289 schedule_timeout_interruptible(msecs_to_jiffies(delay) + 2);
290}
291
292static int tsl2563_adjust_gainlevel(struct tsl2563_chip *chip, u16 adc)
293{
294 struct i2c_client *client = chip->client;
295
296 if (adc > chip->gainlevel->max || adc < chip->gainlevel->min) {
297
298 (adc > chip->gainlevel->max) ?
299 chip->gainlevel++ : chip->gainlevel--;
300
301 i2c_smbus_write_byte_data(client,
302 TSL2563_CMD | TSL2563_REG_TIMING,
303 chip->gainlevel->gaintime);
304
305 tsl2563_wait_adc(chip);
306 tsl2563_wait_adc(chip);
307
308 return 1;
309 } else
310 return 0;
311}
312
313static int tsl2563_get_adc(struct tsl2563_chip *chip)
314{
315 struct i2c_client *client = chip->client;
316 u16 adc0, adc1;
317 int retry = 1;
318 int ret = 0;
319
320 if (chip->suspended)
321 goto out;
322
323 if (!chip->int_enabled) {
324 cancel_delayed_work(&chip->poweroff_work);
325
326 if (!tsl2563_get_power(chip)) {
327 ret = tsl2563_set_power(chip, 1);
328 if (ret)
329 goto out;
330 ret = tsl2563_configure(chip);
331 if (ret)
332 goto out;
333 tsl2563_wait_adc(chip);
334 }
335 }
336
337 while (retry) {
338 ret = i2c_smbus_read_word_data(client,
339 TSL2563_CMD | TSL2563_REG_DATA0LOW);
340 if (ret < 0)
341 goto out;
342 adc0 = ret;
343
344 ret = i2c_smbus_read_word_data(client,
345 TSL2563_CMD | TSL2563_REG_DATA1LOW);
346 if (ret < 0)
347 goto out;
348 adc1 = ret;
349
350 retry = tsl2563_adjust_gainlevel(chip, adc0);
351 }
352
353 chip->data0 = normalize_adc(adc0, chip->gainlevel->gaintime);
354 chip->data1 = normalize_adc(adc1, chip->gainlevel->gaintime);
355
356 if (!chip->int_enabled)
357 schedule_delayed_work(&chip->poweroff_work, 5 * HZ);
358
359 ret = 0;
360out:
361 return ret;
362}
363
364static inline int calib_to_sysfs(u32 calib)
365{
366 return (int) (((calib * CALIB_BASE_SYSFS) +
367 CALIB_FRAC_HALF) >> CALIB_FRAC_BITS);
368}
369
370static inline u32 calib_from_sysfs(int value)
371{
372 return (((u32) value) << CALIB_FRAC_BITS) / CALIB_BASE_SYSFS;
373}
374
375/*
376 * Conversions between lux and ADC values.
377 *
378 * The basic formula is lux = c0 * adc0 - c1 * adc1, where c0 and c1 are
379 * appropriate constants. Different constants are needed for different
380 * kinds of light, determined by the ratio adc1/adc0 (basically the ratio
381 * of the intensities in infrared and visible wavelengths). lux_table below
382 * lists the upper threshold of the adc1/adc0 ratio and the corresponding
383 * constants.
384 */
385
386struct tsl2563_lux_coeff {
387 unsigned long ch_ratio;
388 unsigned long ch0_coeff;
389 unsigned long ch1_coeff;
390};
391
392static const struct tsl2563_lux_coeff lux_table[] = {
393 {
394 .ch_ratio = FRAC10K(1300),
395 .ch0_coeff = FRAC10K(315),
396 .ch1_coeff = FRAC10K(262),
397 }, {
398 .ch_ratio = FRAC10K(2600),
399 .ch0_coeff = FRAC10K(337),
400 .ch1_coeff = FRAC10K(430),
401 }, {
402 .ch_ratio = FRAC10K(3900),
403 .ch0_coeff = FRAC10K(363),
404 .ch1_coeff = FRAC10K(529),
405 }, {
406 .ch_ratio = FRAC10K(5200),
407 .ch0_coeff = FRAC10K(392),
408 .ch1_coeff = FRAC10K(605),
409 }, {
410 .ch_ratio = FRAC10K(6500),
411 .ch0_coeff = FRAC10K(229),
412 .ch1_coeff = FRAC10K(291),
413 }, {
414 .ch_ratio = FRAC10K(8000),
415 .ch0_coeff = FRAC10K(157),
416 .ch1_coeff = FRAC10K(180),
417 }, {
418 .ch_ratio = FRAC10K(13000),
419 .ch0_coeff = FRAC10K(34),
420 .ch1_coeff = FRAC10K(26),
421 }, {
422 .ch_ratio = ULONG_MAX,
423 .ch0_coeff = 0,
424 .ch1_coeff = 0,
425 },
426};
427
428/* Convert normalized, scaled ADC values to lux. */
429static unsigned int adc_to_lux(u32 adc0, u32 adc1)
430{
431 const struct tsl2563_lux_coeff *lp = lux_table;
432 unsigned long ratio, lux, ch0 = adc0, ch1 = adc1;
433
434 ratio = ch0 ? ((ch1 << ADC_FRAC_BITS) / ch0) : ULONG_MAX;
435
436 while (lp->ch_ratio < ratio)
437 lp++;
438
439 lux = ch0 * lp->ch0_coeff - ch1 * lp->ch1_coeff;
440
441 return (unsigned int) (lux >> ADC_FRAC_BITS);
442}
443
444/* Apply calibration coefficient to ADC count. */
445static u32 calib_adc(u32 adc, u32 calib)
446{
447 unsigned long scaled = adc;
448
449 scaled *= calib;
450 scaled >>= CALIB_FRAC_BITS;
451
452 return (u32) scaled;
453}
454
455static int tsl2563_write_raw(struct iio_dev *indio_dev,
456 struct iio_chan_spec const *chan,
457 int val,
458 int val2,
459 long mask)
460{
461 struct tsl2563_chip *chip = iio_priv(indio_dev);
462
463 if (chan->channel == IIO_MOD_LIGHT_BOTH)
464 chip->calib0 = calib_from_sysfs(val);
465 else
466 chip->calib1 = calib_from_sysfs(val);
467
468 return 0;
469}
470
471static int tsl2563_read_raw(struct iio_dev *indio_dev,
472 struct iio_chan_spec const *chan,
473 int *val,
474 int *val2,
475 long m)
476{
477 int ret = -EINVAL;
478 u32 calib0, calib1;
479 struct tsl2563_chip *chip = iio_priv(indio_dev);
480
481 mutex_lock(&chip->lock);
482 switch (m) {
483 case IIO_CHAN_INFO_RAW:
484 case IIO_CHAN_INFO_PROCESSED:
485 switch (chan->type) {
486 case IIO_LIGHT:
487 ret = tsl2563_get_adc(chip);
488 if (ret)
489 goto error_ret;
490 calib0 = calib_adc(chip->data0, chip->calib0) *
491 chip->cover_comp_gain;
492 calib1 = calib_adc(chip->data1, chip->calib1) *
493 chip->cover_comp_gain;
494 *val = adc_to_lux(calib0, calib1);
495 ret = IIO_VAL_INT;
496 break;
497 case IIO_INTENSITY:
498 ret = tsl2563_get_adc(chip);
499 if (ret)
500 goto error_ret;
501 if (chan->channel == 0)
502 *val = chip->data0;
503 else
504 *val = chip->data1;
505 ret = IIO_VAL_INT;
506 break;
507 default:
508 break;
509 }
510 break;
511
512 case IIO_CHAN_INFO_CALIBSCALE:
513 if (chan->channel == 0)
514 *val = calib_to_sysfs(chip->calib0);
515 else
516 *val = calib_to_sysfs(chip->calib1);
517 ret = IIO_VAL_INT;
518 break;
519 default:
520 ret = -EINVAL;
521 goto error_ret;
522 }
523
524error_ret:
525 mutex_unlock(&chip->lock);
526 return ret;
527}
528
529static const struct iio_chan_spec tsl2563_channels[] = {
530 {
531 .type = IIO_LIGHT,
532 .indexed = 1,
533 .info_mask = IIO_CHAN_INFO_PROCESSED_SEPARATE_BIT,
534 .channel = 0,
535 }, {
536 .type = IIO_INTENSITY,
537 .modified = 1,
538 .channel2 = IIO_MOD_LIGHT_BOTH,
539 .info_mask = IIO_CHAN_INFO_RAW_SEPARATE_BIT |
540 IIO_CHAN_INFO_CALIBSCALE_SEPARATE_BIT,
541 .event_mask = (IIO_EV_BIT(IIO_EV_TYPE_THRESH,
542 IIO_EV_DIR_RISING) |
543 IIO_EV_BIT(IIO_EV_TYPE_THRESH,
544 IIO_EV_DIR_FALLING)),
545 }, {
546 .type = IIO_INTENSITY,
547 .modified = 1,
548 .channel2 = IIO_MOD_LIGHT_IR,
549 .info_mask = IIO_CHAN_INFO_RAW_SEPARATE_BIT |
550 IIO_CHAN_INFO_CALIBSCALE_SEPARATE_BIT,
551 }
552};
553
554static int tsl2563_read_thresh(struct iio_dev *indio_dev,
555 u64 event_code,
556 int *val)
557{
558 struct tsl2563_chip *chip = iio_priv(indio_dev);
559
560 switch (IIO_EVENT_CODE_EXTRACT_DIR(event_code)) {
561 case IIO_EV_DIR_RISING:
562 *val = chip->high_thres;
563 break;
564 case IIO_EV_DIR_FALLING:
565 *val = chip->low_thres;
566 break;
567 default:
568 return -EINVAL;
569 }
570
571 return 0;
572}
573
574static int tsl2563_write_thresh(struct iio_dev *indio_dev,
575 u64 event_code,
576 int val)
577{
578 struct tsl2563_chip *chip = iio_priv(indio_dev);
579 int ret;
580 u8 address;
581
582 if (IIO_EVENT_CODE_EXTRACT_DIR(event_code) == IIO_EV_DIR_RISING)
583 address = TSL2563_REG_HIGHLOW;
584 else
585 address = TSL2563_REG_LOWLOW;
586 mutex_lock(&chip->lock);
587 ret = i2c_smbus_write_byte_data(chip->client, TSL2563_CMD | address,
588 val & 0xFF);
589 if (ret)
590 goto error_ret;
591 ret = i2c_smbus_write_byte_data(chip->client,
592 TSL2563_CMD | (address + 1),
593 (val >> 8) & 0xFF);
594 if (IIO_EVENT_CODE_EXTRACT_DIR(event_code) == IIO_EV_DIR_RISING)
595 chip->high_thres = val;
596 else
597 chip->low_thres = val;
598
599error_ret:
600 mutex_unlock(&chip->lock);
601
602 return ret;
603}
604
605static irqreturn_t tsl2563_event_handler(int irq, void *private)
606{
607 struct iio_dev *dev_info = private;
608 struct tsl2563_chip *chip = iio_priv(dev_info);
609
610 iio_push_event(dev_info,
611 IIO_UNMOD_EVENT_CODE(IIO_LIGHT,
612 0,
613 IIO_EV_TYPE_THRESH,
614 IIO_EV_DIR_EITHER),
615 iio_get_time_ns());
616
617 /* clear the interrupt and push the event */
618 i2c_smbus_write_byte(chip->client, TSL2563_CMD | TSL2563_CLEARINT);
619 return IRQ_HANDLED;
620}
621
622static int tsl2563_write_interrupt_config(struct iio_dev *indio_dev,
623 u64 event_code,
624 int state)
625{
626 struct tsl2563_chip *chip = iio_priv(indio_dev);
627 int ret = 0;
628
629 mutex_lock(&chip->lock);
630 if (state && !(chip->intr & 0x30)) {
631 chip->intr &= ~0x30;
632 chip->intr |= 0x10;
633 /* ensure the chip is actually on */
634 cancel_delayed_work(&chip->poweroff_work);
635 if (!tsl2563_get_power(chip)) {
636 ret = tsl2563_set_power(chip, 1);
637 if (ret)
638 goto out;
639 ret = tsl2563_configure(chip);
640 if (ret)
641 goto out;
642 }
643 ret = i2c_smbus_write_byte_data(chip->client,
644 TSL2563_CMD | TSL2563_REG_INT,
645 chip->intr);
646 chip->int_enabled = true;
647 }
648
649 if (!state && (chip->intr & 0x30)) {
650 chip->intr &= ~0x30;
651 ret = i2c_smbus_write_byte_data(chip->client,
652 TSL2563_CMD | TSL2563_REG_INT,
653 chip->intr);
654 chip->int_enabled = false;
655 /* now the interrupt is not enabled, we can go to sleep */
656 schedule_delayed_work(&chip->poweroff_work, 5 * HZ);
657 }
658out:
659 mutex_unlock(&chip->lock);
660
661 return ret;
662}
663
664static int tsl2563_read_interrupt_config(struct iio_dev *indio_dev,
665 u64 event_code)
666{
667 struct tsl2563_chip *chip = iio_priv(indio_dev);
668 int ret;
669
670 mutex_lock(&chip->lock);
671 ret = i2c_smbus_read_byte_data(chip->client,
672 TSL2563_CMD | TSL2563_REG_INT);
673 mutex_unlock(&chip->lock);
674 if (ret < 0)
675 return ret;
676
677 return !!(ret & 0x30);
678}
679
680static const struct iio_info tsl2563_info_no_irq = {
681 .driver_module = THIS_MODULE,
682 .read_raw = &tsl2563_read_raw,
683 .write_raw = &tsl2563_write_raw,
684};
685
686static const struct iio_info tsl2563_info = {
687 .driver_module = THIS_MODULE,
688 .read_raw = &tsl2563_read_raw,
689 .write_raw = &tsl2563_write_raw,
690 .read_event_value = &tsl2563_read_thresh,
691 .write_event_value = &tsl2563_write_thresh,
692 .read_event_config = &tsl2563_read_interrupt_config,
693 .write_event_config = &tsl2563_write_interrupt_config,
694};
695
696static int tsl2563_probe(struct i2c_client *client,
697 const struct i2c_device_id *device_id)
698{
699 struct iio_dev *indio_dev;
700 struct tsl2563_chip *chip;
701 struct tsl2563_platform_data *pdata = client->dev.platform_data;
702 int err = 0;
703 u8 id = 0;
704
705 indio_dev = iio_device_alloc(sizeof(*chip));
706 if (!indio_dev)
707 return -ENOMEM;
708
709 chip = iio_priv(indio_dev);
710
711 i2c_set_clientdata(client, chip);
712 chip->client = client;
713
714 err = tsl2563_detect(chip);
715 if (err) {
716 dev_err(&client->dev, "detect error %d\n", -err);
717 goto fail1;
718 }
719
720 err = tsl2563_read_id(chip, &id);
721 if (err) {
722 dev_err(&client->dev, "read id error %d\n", -err);
723 goto fail1;
724 }
725
726 mutex_init(&chip->lock);
727
728 /* Default values used until userspace says otherwise */
729 chip->low_thres = 0x0;
730 chip->high_thres = 0xffff;
731 chip->gainlevel = tsl2563_gainlevel_table;
732 chip->intr = TSL2563_INT_PERSIST(4);
733 chip->calib0 = calib_from_sysfs(CALIB_BASE_SYSFS);
734 chip->calib1 = calib_from_sysfs(CALIB_BASE_SYSFS);
735
736 if (pdata)
737 chip->cover_comp_gain = pdata->cover_comp_gain;
738 else
739 chip->cover_comp_gain = 1;
740
741 dev_info(&client->dev, "model %d, rev. %d\n", id >> 4, id & 0x0f);
742 indio_dev->name = client->name;
743 indio_dev->channels = tsl2563_channels;
744 indio_dev->num_channels = ARRAY_SIZE(tsl2563_channels);
745 indio_dev->dev.parent = &client->dev;
746 indio_dev->modes = INDIO_DIRECT_MODE;
747
748 if (client->irq)
749 indio_dev->info = &tsl2563_info;
750 else
751 indio_dev->info = &tsl2563_info_no_irq;
752
753 if (client->irq) {
754 err = request_threaded_irq(client->irq,
755 NULL,
756 &tsl2563_event_handler,
757 IRQF_TRIGGER_RISING | IRQF_ONESHOT,
758 "tsl2563_event",
759 indio_dev);
760 if (err) {
761 dev_err(&client->dev, "irq request error %d\n", -err);
762 goto fail1;
763 }
764 }
765
766 err = tsl2563_configure(chip);
767 if (err) {
768 dev_err(&client->dev, "configure error %d\n", -err);
769 goto fail2;
770 }
771
772 INIT_DELAYED_WORK(&chip->poweroff_work, tsl2563_poweroff_work);
773
774 /* The interrupt cannot yet be enabled so this is fine without lock */
775 schedule_delayed_work(&chip->poweroff_work, 5 * HZ);
776
777 err = iio_device_register(indio_dev);
778 if (err) {
779 dev_err(&client->dev, "iio registration error %d\n", -err);
780 goto fail3;
781 }
782
783 return 0;
784
785fail3:
786 cancel_delayed_work(&chip->poweroff_work);
787 flush_scheduled_work();
788fail2:
789 if (client->irq)
790 free_irq(client->irq, indio_dev);
791fail1:
792 iio_device_free(indio_dev);
793 return err;
794}
795
796static int tsl2563_remove(struct i2c_client *client)
797{
798 struct tsl2563_chip *chip = i2c_get_clientdata(client);
799 struct iio_dev *indio_dev = iio_priv_to_dev(chip);
800
801 iio_device_unregister(indio_dev);
802 if (!chip->int_enabled)
803 cancel_delayed_work(&chip->poweroff_work);
804 /* Ensure that interrupts are disabled - then flush any bottom halves */
805 chip->intr &= ~0x30;
806 i2c_smbus_write_byte_data(chip->client, TSL2563_CMD | TSL2563_REG_INT,
807 chip->intr);
808 flush_scheduled_work();
809 tsl2563_set_power(chip, 0);
810 if (client->irq)
811 free_irq(client->irq, indio_dev);
812
813 iio_device_free(indio_dev);
814
815 return 0;
816}
817
818#ifdef CONFIG_PM_SLEEP
819static int tsl2563_suspend(struct device *dev)
820{
821 struct tsl2563_chip *chip = i2c_get_clientdata(to_i2c_client(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
832out:
833 mutex_unlock(&chip->lock);
834 return ret;
835}
836
837static int tsl2563_resume(struct device *dev)
838{
839 struct tsl2563_chip *chip = i2c_get_clientdata(to_i2c_client(dev));
840 int ret;
841
842 mutex_lock(&chip->lock);
843
844 ret = tsl2563_set_power(chip, 1);
845 if (ret)
846 goto out;
847
848 ret = tsl2563_configure(chip);
849 if (ret)
850 goto out;
851
852 chip->suspended = false;
853
854out:
855 mutex_unlock(&chip->lock);
856 return ret;
857}
858
859static SIMPLE_DEV_PM_OPS(tsl2563_pm_ops, tsl2563_suspend, tsl2563_resume);
860#define TSL2563_PM_OPS (&tsl2563_pm_ops)
861#else
862#define TSL2563_PM_OPS NULL
863#endif
864
865static const struct i2c_device_id tsl2563_id[] = {
866 { "tsl2560", 0 },
867 { "tsl2561", 1 },
868 { "tsl2562", 2 },
869 { "tsl2563", 3 },
870 {}
871};
872MODULE_DEVICE_TABLE(i2c, tsl2563_id);
873
874static struct i2c_driver tsl2563_i2c_driver = {
875 .driver = {
876 .name = "tsl2563",
877 .pm = TSL2563_PM_OPS,
878 },
879 .probe = tsl2563_probe,
880 .remove = tsl2563_remove,
881 .id_table = tsl2563_id,
882};
883module_i2c_driver(tsl2563_i2c_driver);
884
885MODULE_AUTHOR("Nokia Corporation");
886MODULE_DESCRIPTION("tsl2563 light sensor driver");
887MODULE_LICENSE("GPL");
generated by cgit v1.2.2 (git 2.25.0) at 2024-11-13 13:41:51 -0500