1 /*
2 * drivers/i2c/chips/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 "../iio.h"
39 #include "../sysfs.h"
40 #include "../events.h"
41 #include "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
89 struct tsl2563_gainlevel_coeff {
90 u8 gaintime;
91 u16 min;
92 u16 max;
93 };
94
95 static 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
115 struct 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
tsl2563_set_power(struct tsl2563_chip * chip,int on)140 static 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 */
tsl2563_get_power(struct tsl2563_chip * chip)154 static 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
tsl2563_configure(struct tsl2563_chip * chip)166 static 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 /* Interrupt register is automatically written anyway if it is relevant
194 so is not here */
195 error_ret:
196 return ret;
197 }
198
tsl2563_poweroff_work(struct work_struct * work)199 static void tsl2563_poweroff_work(struct work_struct *work)
200 {
201 struct tsl2563_chip *chip =
202 container_of(work, struct tsl2563_chip, poweroff_work.work);
203 tsl2563_set_power(chip, 0);
204 }
205
tsl2563_detect(struct tsl2563_chip * chip)206 static int tsl2563_detect(struct tsl2563_chip *chip)
207 {
208 int ret;
209
210 ret = tsl2563_set_power(chip, 1);
211 if (ret)
212 return ret;
213
214 ret = tsl2563_get_power(chip);
215 if (ret < 0)
216 return ret;
217
218 return ret ? 0 : -ENODEV;
219 }
220
tsl2563_read_id(struct tsl2563_chip * chip,u8 * id)221 static int tsl2563_read_id(struct tsl2563_chip *chip, u8 *id)
222 {
223 struct i2c_client *client = chip->client;
224 int ret;
225
226 ret = i2c_smbus_read_byte_data(client, TSL2563_CMD | TSL2563_REG_ID);
227 if (ret < 0)
228 return ret;
229
230 *id = ret;
231
232 return 0;
233 }
234
235 /*
236 * "Normalized" ADC value is one obtained with 400ms of integration time and
237 * 16x gain. This function returns the number of bits of shift needed to
238 * convert between normalized values and HW values obtained using given
239 * timing and gain settings.
240 */
adc_shiftbits(u8 timing)241 static int adc_shiftbits(u8 timing)
242 {
243 int shift = 0;
244
245 switch (timing & TSL2563_TIMING_MASK) {
246 case TSL2563_TIMING_13MS:
247 shift += 5;
248 break;
249 case TSL2563_TIMING_100MS:
250 shift += 2;
251 break;
252 case TSL2563_TIMING_400MS:
253 /* no-op */
254 break;
255 }
256
257 if (!(timing & TSL2563_TIMING_GAIN16))
258 shift += 4;
259
260 return shift;
261 }
262
263 /* Convert a HW ADC value to normalized scale. */
normalize_adc(u16 adc,u8 timing)264 static u32 normalize_adc(u16 adc, u8 timing)
265 {
266 return adc << adc_shiftbits(timing);
267 }
268
tsl2563_wait_adc(struct tsl2563_chip * chip)269 static void tsl2563_wait_adc(struct tsl2563_chip *chip)
270 {
271 unsigned int delay;
272
273 switch (chip->gainlevel->gaintime & TSL2563_TIMING_MASK) {
274 case TSL2563_TIMING_13MS:
275 delay = 14;
276 break;
277 case TSL2563_TIMING_100MS:
278 delay = 101;
279 break;
280 default:
281 delay = 402;
282 }
283 /*
284 * TODO: Make sure that we wait at least required delay but why we
285 * have to extend it one tick more?
286 */
287 schedule_timeout_interruptible(msecs_to_jiffies(delay) + 2);
288 }
289
tsl2563_adjust_gainlevel(struct tsl2563_chip * chip,u16 adc)290 static int tsl2563_adjust_gainlevel(struct tsl2563_chip *chip, u16 adc)
291 {
292 struct i2c_client *client = chip->client;
293
294 if (adc > chip->gainlevel->max || adc < chip->gainlevel->min) {
295
296 (adc > chip->gainlevel->max) ?
297 chip->gainlevel++ : chip->gainlevel--;
298
299 i2c_smbus_write_byte_data(client,
300 TSL2563_CMD | TSL2563_REG_TIMING,
301 chip->gainlevel->gaintime);
302
303 tsl2563_wait_adc(chip);
304 tsl2563_wait_adc(chip);
305
306 return 1;
307 } else
308 return 0;
309 }
310
tsl2563_get_adc(struct tsl2563_chip * chip)311 static int tsl2563_get_adc(struct tsl2563_chip *chip)
312 {
313 struct i2c_client *client = chip->client;
314 u16 adc0, adc1;
315 int retry = 1;
316 int ret = 0;
317
318 if (chip->suspended)
319 goto out;
320
321 if (!chip->int_enabled) {
322 cancel_delayed_work(&chip->poweroff_work);
323
324 if (!tsl2563_get_power(chip)) {
325 ret = tsl2563_set_power(chip, 1);
326 if (ret)
327 goto out;
328 ret = tsl2563_configure(chip);
329 if (ret)
330 goto out;
331 tsl2563_wait_adc(chip);
332 }
333 }
334
335 while (retry) {
336 ret = i2c_smbus_read_word_data(client,
337 TSL2563_CMD | TSL2563_REG_DATA0LOW);
338 if (ret < 0)
339 goto out;
340 adc0 = ret;
341
342 ret = i2c_smbus_read_word_data(client,
343 TSL2563_CMD | TSL2563_REG_DATA1LOW);
344 if (ret < 0)
345 goto out;
346 adc1 = ret;
347
348 retry = tsl2563_adjust_gainlevel(chip, adc0);
349 }
350
351 chip->data0 = normalize_adc(adc0, chip->gainlevel->gaintime);
352 chip->data1 = normalize_adc(adc1, chip->gainlevel->gaintime);
353
354 if (!chip->int_enabled)
355 schedule_delayed_work(&chip->poweroff_work, 5 * HZ);
356
357 ret = 0;
358 out:
359 return ret;
360 }
361
calib_to_sysfs(u32 calib)362 static inline int calib_to_sysfs(u32 calib)
363 {
364 return (int) (((calib * CALIB_BASE_SYSFS) +
365 CALIB_FRAC_HALF) >> CALIB_FRAC_BITS);
366 }
367
calib_from_sysfs(int value)368 static inline u32 calib_from_sysfs(int value)
369 {
370 return (((u32) value) << CALIB_FRAC_BITS) / CALIB_BASE_SYSFS;
371 }
372
373 /*
374 * Conversions between lux and ADC values.
375 *
376 * The basic formula is lux = c0 * adc0 - c1 * adc1, where c0 and c1 are
377 * appropriate constants. Different constants are needed for different
378 * kinds of light, determined by the ratio adc1/adc0 (basically the ratio
379 * of the intensities in infrared and visible wavelengths). lux_table below
380 * lists the upper threshold of the adc1/adc0 ratio and the corresponding
381 * constants.
382 */
383
384 struct tsl2563_lux_coeff {
385 unsigned long ch_ratio;
386 unsigned long ch0_coeff;
387 unsigned long ch1_coeff;
388 };
389
390 static const struct tsl2563_lux_coeff lux_table[] = {
391 {
392 .ch_ratio = FRAC10K(1300),
393 .ch0_coeff = FRAC10K(315),
394 .ch1_coeff = FRAC10K(262),
395 }, {
396 .ch_ratio = FRAC10K(2600),
397 .ch0_coeff = FRAC10K(337),
398 .ch1_coeff = FRAC10K(430),
399 }, {
400 .ch_ratio = FRAC10K(3900),
401 .ch0_coeff = FRAC10K(363),
402 .ch1_coeff = FRAC10K(529),
403 }, {
404 .ch_ratio = FRAC10K(5200),
405 .ch0_coeff = FRAC10K(392),
406 .ch1_coeff = FRAC10K(605),
407 }, {
408 .ch_ratio = FRAC10K(6500),
409 .ch0_coeff = FRAC10K(229),
410 .ch1_coeff = FRAC10K(291),
411 }, {
412 .ch_ratio = FRAC10K(8000),
413 .ch0_coeff = FRAC10K(157),
414 .ch1_coeff = FRAC10K(180),
415 }, {
416 .ch_ratio = FRAC10K(13000),
417 .ch0_coeff = FRAC10K(34),
418 .ch1_coeff = FRAC10K(26),
419 }, {
420 .ch_ratio = ULONG_MAX,
421 .ch0_coeff = 0,
422 .ch1_coeff = 0,
423 },
424 };
425
426 /*
427 * Convert normalized, scaled ADC values to lux.
428 */
adc_to_lux(u32 adc0,u32 adc1)429 static 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 /*--------------------------------------------------------------*/
445 /* Sysfs interface */
446 /*--------------------------------------------------------------*/
447
448
449 /* Apply calibration coefficient to ADC count. */
calib_adc(u32 adc,u32 calib)450 static u32 calib_adc(u32 adc, u32 calib)
451 {
452 unsigned long scaled = adc;
453
454 scaled *= calib;
455 scaled >>= CALIB_FRAC_BITS;
456
457 return (u32) scaled;
458 }
459
tsl2563_write_raw(struct iio_dev * indio_dev,struct iio_chan_spec const * chan,int val,int val2,long mask)460 static int tsl2563_write_raw(struct iio_dev *indio_dev,
461 struct iio_chan_spec const *chan,
462 int val,
463 int val2,
464 long mask)
465 {
466 struct tsl2563_chip *chip = iio_priv(indio_dev);
467
468 if (chan->channel == 0)
469 chip->calib0 = calib_from_sysfs(val);
470 else
471 chip->calib1 = calib_from_sysfs(val);
472
473 return 0;
474 }
475
tsl2563_read_raw(struct iio_dev * indio_dev,struct iio_chan_spec const * chan,int * val,int * val2,long m)476 static int tsl2563_read_raw(struct iio_dev *indio_dev,
477 struct iio_chan_spec const *chan,
478 int *val,
479 int *val2,
480 long m)
481 {
482 int ret = -EINVAL;
483 u32 calib0, calib1;
484 struct tsl2563_chip *chip = iio_priv(indio_dev);
485
486 mutex_lock(&chip->lock);
487 switch (m) {
488 case 0:
489 switch (chan->type) {
490 case IIO_LIGHT:
491 ret = tsl2563_get_adc(chip);
492 if (ret)
493 goto error_ret;
494 calib0 = calib_adc(chip->data0, chip->calib0) *
495 chip->cover_comp_gain;
496 calib1 = calib_adc(chip->data1, chip->calib1) *
497 chip->cover_comp_gain;
498 *val = adc_to_lux(calib0, calib1);
499 ret = IIO_VAL_INT;
500 break;
501 case IIO_INTENSITY:
502 ret = tsl2563_get_adc(chip);
503 if (ret)
504 goto error_ret;
505 if (chan->channel == 0)
506 *val = chip->data0;
507 else
508 *val = chip->data1;
509 ret = IIO_VAL_INT;
510 break;
511 default:
512 break;
513 }
514 break;
515
516 case IIO_CHAN_INFO_CALIBSCALE:
517 if (chan->channel == 0)
518 *val = calib_to_sysfs(chip->calib0);
519 else
520 *val = calib_to_sysfs(chip->calib1);
521 ret = IIO_VAL_INT;
522 break;
523 default:
524 ret = -EINVAL;
525 goto error_ret;
526 }
527
528 error_ret:
529 mutex_unlock(&chip->lock);
530 return ret;
531 }
532
533 static const struct iio_chan_spec tsl2563_channels[] = {
534 {
535 .type = IIO_LIGHT,
536 .indexed = 1,
537 .channel = 0,
538 }, {
539 .type = IIO_INTENSITY,
540 .modified = 1,
541 .channel2 = IIO_MOD_LIGHT_BOTH,
542 .info_mask = IIO_CHAN_INFO_CALIBSCALE_SEPARATE_BIT,
543 .event_mask = (IIO_EV_BIT(IIO_EV_TYPE_THRESH,
544 IIO_EV_DIR_RISING) |
545 IIO_EV_BIT(IIO_EV_TYPE_THRESH,
546 IIO_EV_DIR_FALLING)),
547 }, {
548 .type = IIO_INTENSITY,
549 .modified = 1,
550 .channel2 = IIO_MOD_LIGHT_IR,
551 .info_mask = IIO_CHAN_INFO_CALIBSCALE_SEPARATE_BIT,
552 }
553 };
554
tsl2563_read_thresh(struct iio_dev * indio_dev,u64 event_code,int * val)555 static int tsl2563_read_thresh(struct iio_dev *indio_dev,
556 u64 event_code,
557 int *val)
558 {
559 struct tsl2563_chip *chip = iio_priv(indio_dev);
560
561 switch (IIO_EVENT_CODE_EXTRACT_DIR(event_code)) {
562 case IIO_EV_DIR_RISING:
563 *val = chip->high_thres;
564 break;
565 case IIO_EV_DIR_FALLING:
566 *val = chip->low_thres;
567 break;
568 default:
569 return -EINVAL;
570 }
571
572 return 0;
573 }
574
tsl2563_write_thresh(struct iio_dev * indio_dev,u64 event_code,int val)575 static int tsl2563_write_thresh(struct iio_dev *indio_dev,
576 u64 event_code,
577 int val)
578 {
579 struct tsl2563_chip *chip = iio_priv(indio_dev);
580 int ret;
581 u8 address;
582
583 if (IIO_EVENT_CODE_EXTRACT_DIR(event_code) == IIO_EV_DIR_RISING)
584 address = TSL2563_REG_HIGHLOW;
585 else
586 address = TSL2563_REG_LOWLOW;
587 mutex_lock(&chip->lock);
588 ret = i2c_smbus_write_byte_data(chip->client, TSL2563_CMD | address,
589 val & 0xFF);
590 if (ret)
591 goto error_ret;
592 ret = i2c_smbus_write_byte_data(chip->client,
593 TSL2563_CMD | (address + 1),
594 (val >> 8) & 0xFF);
595 if (IIO_EVENT_CODE_EXTRACT_DIR(event_code) == IIO_EV_DIR_RISING)
596 chip->high_thres = val;
597 else
598 chip->low_thres = val;
599
600 error_ret:
601 mutex_unlock(&chip->lock);
602
603 return ret;
604 }
605
tsl2563_event_handler(int irq,void * private)606 static irqreturn_t tsl2563_event_handler(int irq, void *private)
607 {
608 struct iio_dev *dev_info = private;
609 struct tsl2563_chip *chip = iio_priv(dev_info);
610
611 iio_push_event(dev_info,
612 IIO_UNMOD_EVENT_CODE(IIO_LIGHT,
613 0,
614 IIO_EV_TYPE_THRESH,
615 IIO_EV_DIR_EITHER),
616 iio_get_time_ns());
617
618 /* clear the interrupt and push the event */
619 i2c_smbus_write_byte(chip->client, TSL2563_CMD | TSL2563_CLEARINT);
620 return IRQ_HANDLED;
621 }
622
tsl2563_write_interrupt_config(struct iio_dev * indio_dev,u64 event_code,int state)623 static int tsl2563_write_interrupt_config(struct iio_dev *indio_dev,
624 u64 event_code,
625 int state)
626 {
627 struct tsl2563_chip *chip = iio_priv(indio_dev);
628 int ret = 0;
629
630 mutex_lock(&chip->lock);
631 if (state && !(chip->intr & 0x30)) {
632 chip->intr &= ~0x30;
633 chip->intr |= 0x10;
634 /* ensure the chip is actually on */
635 cancel_delayed_work(&chip->poweroff_work);
636 if (!tsl2563_get_power(chip)) {
637 ret = tsl2563_set_power(chip, 1);
638 if (ret)
639 goto out;
640 ret = tsl2563_configure(chip);
641 if (ret)
642 goto out;
643 }
644 ret = i2c_smbus_write_byte_data(chip->client,
645 TSL2563_CMD | TSL2563_REG_INT,
646 chip->intr);
647 chip->int_enabled = true;
648 }
649
650 if (!state && (chip->intr & 0x30)) {
651 chip->intr |= ~0x30;
652 ret = i2c_smbus_write_byte_data(chip->client,
653 TSL2563_CMD | TSL2563_REG_INT,
654 chip->intr);
655 chip->int_enabled = false;
656 /* now the interrupt is not enabled, we can go to sleep */
657 schedule_delayed_work(&chip->poweroff_work, 5 * HZ);
658 }
659 out:
660 mutex_unlock(&chip->lock);
661
662 return ret;
663 }
664
tsl2563_read_interrupt_config(struct iio_dev * indio_dev,u64 event_code)665 static int tsl2563_read_interrupt_config(struct iio_dev *indio_dev,
666 u64 event_code)
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 goto error_ret;
677 ret = !!(ret & 0x30);
678 error_ret:
679
680 return ret;
681 }
682
683 /*--------------------------------------------------------------*/
684 /* Probe, Attach, Remove */
685 /*--------------------------------------------------------------*/
686 static struct i2c_driver tsl2563_i2c_driver;
687
688 static const struct iio_info tsl2563_info_no_irq = {
689 .driver_module = THIS_MODULE,
690 .read_raw = &tsl2563_read_raw,
691 .write_raw = &tsl2563_write_raw,
692 };
693
694 static const struct iio_info tsl2563_info = {
695 .driver_module = THIS_MODULE,
696 .read_raw = &tsl2563_read_raw,
697 .write_raw = &tsl2563_write_raw,
698 .read_event_value = &tsl2563_read_thresh,
699 .write_event_value = &tsl2563_write_thresh,
700 .read_event_config = &tsl2563_read_interrupt_config,
701 .write_event_config = &tsl2563_write_interrupt_config,
702 };
703
tsl2563_probe(struct i2c_client * client,const struct i2c_device_id * device_id)704 static int __devinit tsl2563_probe(struct i2c_client *client,
705 const struct i2c_device_id *device_id)
706 {
707 struct iio_dev *indio_dev;
708 struct tsl2563_chip *chip;
709 struct tsl2563_platform_data *pdata = client->dev.platform_data;
710 int err = 0;
711 u8 id = 0;
712
713 indio_dev = iio_allocate_device(sizeof(*chip));
714 if (!indio_dev)
715 return -ENOMEM;
716
717 chip = iio_priv(indio_dev);
718
719 i2c_set_clientdata(client, chip);
720 chip->client = client;
721
722 err = tsl2563_detect(chip);
723 if (err) {
724 dev_err(&client->dev, "detect error %d\n", -err);
725 goto fail1;
726 }
727
728 err = tsl2563_read_id(chip, &id);
729 if (err) {
730 dev_err(&client->dev, "read id error %d\n", -err);
731 goto fail1;
732 }
733
734 mutex_init(&chip->lock);
735
736 /* Default values used until userspace says otherwise */
737 chip->low_thres = 0x0;
738 chip->high_thres = 0xffff;
739 chip->gainlevel = tsl2563_gainlevel_table;
740 chip->intr = TSL2563_INT_PERSIST(4);
741 chip->calib0 = calib_from_sysfs(CALIB_BASE_SYSFS);
742 chip->calib1 = calib_from_sysfs(CALIB_BASE_SYSFS);
743
744 if (pdata)
745 chip->cover_comp_gain = pdata->cover_comp_gain;
746 else
747 chip->cover_comp_gain = 1;
748
749 dev_info(&client->dev, "model %d, rev. %d\n", id >> 4, id & 0x0f);
750 indio_dev->name = client->name;
751 indio_dev->channels = tsl2563_channels;
752 indio_dev->num_channels = ARRAY_SIZE(tsl2563_channels);
753 indio_dev->dev.parent = &client->dev;
754 indio_dev->modes = INDIO_DIRECT_MODE;
755
756 if (client->irq)
757 indio_dev->info = &tsl2563_info;
758 else
759 indio_dev->info = &tsl2563_info_no_irq;
760
761 if (client->irq) {
762 err = request_threaded_irq(client->irq,
763 NULL,
764 &tsl2563_event_handler,
765 IRQF_TRIGGER_RISING | IRQF_ONESHOT,
766 "tsl2563_event",
767 indio_dev);
768 if (err) {
769 dev_err(&client->dev, "irq request error %d\n", -err);
770 goto fail1;
771 }
772 }
773
774 err = tsl2563_configure(chip);
775 if (err) {
776 dev_err(&client->dev, "configure error %d\n", -err);
777 goto fail2;
778 }
779
780 INIT_DELAYED_WORK(&chip->poweroff_work, tsl2563_poweroff_work);
781
782 /* The interrupt cannot yet be enabled so this is fine without lock */
783 schedule_delayed_work(&chip->poweroff_work, 5 * HZ);
784
785 err = iio_device_register(indio_dev);
786 if (err) {
787 dev_err(&client->dev, "iio registration error %d\n", -err);
788 goto fail3;
789 }
790
791 return 0;
792
793 fail3:
794 cancel_delayed_work(&chip->poweroff_work);
795 flush_scheduled_work();
796 fail2:
797 if (client->irq)
798 free_irq(client->irq, indio_dev);
799 fail1:
800 iio_free_device(indio_dev);
801 return err;
802 }
803
tsl2563_remove(struct i2c_client * client)804 static int tsl2563_remove(struct i2c_client *client)
805 {
806 struct tsl2563_chip *chip = i2c_get_clientdata(client);
807 struct iio_dev *indio_dev = iio_priv_to_dev(chip);
808
809 iio_device_unregister(indio_dev);
810 if (!chip->int_enabled)
811 cancel_delayed_work(&chip->poweroff_work);
812 /* Ensure that interrupts are disabled - then flush any bottom halves */
813 chip->intr |= ~0x30;
814 i2c_smbus_write_byte_data(chip->client, TSL2563_CMD | TSL2563_REG_INT,
815 chip->intr);
816 flush_scheduled_work();
817 tsl2563_set_power(chip, 0);
818 if (client->irq)
819 free_irq(client->irq, indio_dev);
820
821 iio_free_device(indio_dev);
822
823 return 0;
824 }
825
826 #ifdef CONFIG_PM_SLEEP
tsl2563_suspend(struct device * dev)827 static int tsl2563_suspend(struct device *dev)
828 {
829 struct tsl2563_chip *chip = i2c_get_clientdata(to_i2c_client(dev));
830 int ret;
831
832 mutex_lock(&chip->lock);
833
834 ret = tsl2563_set_power(chip, 0);
835 if (ret)
836 goto out;
837
838 chip->suspended = true;
839
840 out:
841 mutex_unlock(&chip->lock);
842 return ret;
843 }
844
tsl2563_resume(struct device * dev)845 static int tsl2563_resume(struct device *dev)
846 {
847 struct tsl2563_chip *chip = i2c_get_clientdata(to_i2c_client(dev));
848 int ret;
849
850 mutex_lock(&chip->lock);
851
852 ret = tsl2563_set_power(chip, 1);
853 if (ret)
854 goto out;
855
856 ret = tsl2563_configure(chip);
857 if (ret)
858 goto out;
859
860 chip->suspended = false;
861
862 out:
863 mutex_unlock(&chip->lock);
864 return ret;
865 }
866
867 static SIMPLE_DEV_PM_OPS(tsl2563_pm_ops, tsl2563_suspend, tsl2563_resume);
868 #define TSL2563_PM_OPS (&tsl2563_pm_ops)
869 #else
870 #define TSL2563_PM_OPS NULL
871 #endif
872
873 static const struct i2c_device_id tsl2563_id[] = {
874 { "tsl2560", 0 },
875 { "tsl2561", 1 },
876 { "tsl2562", 2 },
877 { "tsl2563", 3 },
878 {}
879 };
880 MODULE_DEVICE_TABLE(i2c, tsl2563_id);
881
882 static struct i2c_driver tsl2563_i2c_driver = {
883 .driver = {
884 .name = "tsl2563",
885 .pm = TSL2563_PM_OPS,
886 },
887 .probe = tsl2563_probe,
888 .remove = __devexit_p(tsl2563_remove),
889 .id_table = tsl2563_id,
890 };
891 module_i2c_driver(tsl2563_i2c_driver);
892
893 MODULE_AUTHOR("Nokia Corporation");
894 MODULE_DESCRIPTION("tsl2563 light sensor driver");
895 MODULE_LICENSE("GPL");
896