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Merge remote-tracking branch 'staging/staging-next'
[deliverable/linux.git] / drivers / iio / light / us5182d.c
CommitLineData
c14f8abe
AR		 1/*
2 * Copyright (c) 2015 Intel Corporation
3 *
4 * Driver for UPISEMI us5182d Proximity and Ambient Light Sensor.
5 *
6 * This program is free software; you can redistribute it and/or modify it
7 * under the terms of the GNU General Public License version 2 as published by
8 * the Free Software Foundation.
9 *
10 * This program is distributed in the hope it will be useful, but WITHOUT
11 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
12 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
13 * more details.
14 *
15 * To do: Interrupt support.
16 */
17
18#include <linux/kernel.h>
19#include <linux/module.h>
20#include <linux/acpi.h>
21#include <linux/delay.h>
22#include <linux/i2c.h>
b6695254 23#include <linux/iio/events.h>
c14f8abe 24#include <linux/iio/iio.h>
b6695254
AR		 25#include <linux/interrupt.h>
26#include <linux/irq.h>
c14f8abe
AR		 27#include <linux/iio/sysfs.h>
28#include <linux/mutex.h>
f0e5f57d
AR		 29#include <linux/pm.h>
30#include <linux/pm_runtime.h>
c14f8abe
AR		 31
32#define US5182D_REG_CFG0 0x00
33#define US5182D_CFG0_ONESHOT_EN BIT(6)
34#define US5182D_CFG0_SHUTDOWN_EN BIT(7)
35#define US5182D_CFG0_WORD_ENABLE BIT(0)
b6695254
AR		 36#define US5182D_CFG0_PROX BIT(3)
37#define US5182D_CFG0_PX_IRQ BIT(2)
c14f8abe
AR		 38
39#define US5182D_REG_CFG1 0x01
40#define US5182D_CFG1_ALS_RES16 BIT(4)
41#define US5182D_CFG1_AGAIN_DEFAULT 0x00
42
43#define US5182D_REG_CFG2 0x02
44#define US5182D_CFG2_PX_RES16 BIT(4)
45#define US5182D_CFG2_PXGAIN_DEFAULT BIT(2)
46
47#define US5182D_REG_CFG3 0x03
48#define US5182D_CFG3_LED_CURRENT100 (BIT(4) | BIT(5))
b6695254 49#define US5182D_CFG3_INT_SOURCE_PX BIT(3)
c14f8abe
AR		 50
51#define US5182D_REG_CFG4 0x10
52
53/*
54 * Registers for tuning the auto dark current cancelling feature.
55 * DARK_TH(reg 0x27,0x28) - threshold (counts) for auto dark cancelling.
56 * when ALS > DARK_TH --> ALS_Code = ALS - Upper(0x2A) * Dark
57 * when ALS < DARK_TH --> ALS_Code = ALS - Lower(0x29) * Dark
58 */
59#define US5182D_REG_UDARK_TH 0x27
60#define US5182D_REG_DARK_AUTO_EN 0x2b
61#define US5182D_REG_AUTO_LDARK_GAIN 0x29
62#define US5182D_REG_AUTO_HDARK_GAIN 0x2a
63
b6695254
AR		 64/* Thresholds for events: px low (0x08-l, 0x09-h), px high (0x0a-l 0x0b-h) */
65#define US5182D_REG_PXL_TH 0x08
66#define US5182D_REG_PXH_TH 0x0a
67
68#define US5182D_REG_PXL_TH_DEFAULT 1000
69#define US5182D_REG_PXH_TH_DEFAULT 30000
70
c14f8abe
AR		 71#define US5182D_OPMODE_ALS 0x01
72#define US5182D_OPMODE_PX 0x02
73#define US5182D_OPMODE_SHIFT 4
74
75#define US5182D_REG_DARK_AUTO_EN_DEFAULT 0x80
76#define US5182D_REG_AUTO_LDARK_GAIN_DEFAULT 0x16
77#define US5182D_REG_AUTO_HDARK_GAIN_DEFAULT 0x00
78
79#define US5182D_REG_ADL 0x0c
80#define US5182D_REG_PDL 0x0e
81
82#define US5182D_REG_MODE_STORE 0x21
83#define US5182D_STORE_MODE 0x01
84
85#define US5182D_REG_CHIPID 0xb2
86
87#define US5182D_OPMODE_MASK GENMASK(5, 4)
88#define US5182D_AGAIN_MASK 0x07
89#define US5182D_RESET_CHIP 0x01
90
91#define US5182D_CHIPID 0x26
92#define US5182D_DRV_NAME "us5182d"
93
94#define US5182D_GA_RESOLUTION 1000
95
96#define US5182D_READ_BYTE 1
97#define US5182D_READ_WORD 2
98#define US5182D_OPSTORE_SLEEP_TIME 20 /* ms */
f0e5f57d 99#define US5182D_SLEEP_MS 3000 /* ms */
b6695254
AR		 100#define US5182D_PXH_TH_DISABLE 0xffff
101#define US5182D_PXL_TH_DISABLE 0x0000
c14f8abe
AR		 102
103/* Available ranges: [12354, 7065, 3998, 2202, 1285, 498, 256, 138] lux */
104static const int us5182d_scales[] = {188500, 107800, 61000, 33600, 19600, 7600,
105 3900, 2100};
106
107/*
108 * Experimental thresholds that work with US5182D sensor on evaluation board
109 * roughly between 12-32 lux
110 */
111static u16 us5182d_dark_ths_vals[] = {170, 200, 512, 512, 800, 2000, 4000,
112 8000};
113
114enum mode {
115 US5182D_ALS_PX,
116 US5182D_ALS_ONLY,
117 US5182D_PX_ONLY
118};
119
c3304c21
AR		 120enum pmode {
121 US5182D_CONTINUOUS,
122 US5182D_ONESHOT
123};
124
c14f8abe
AR		 125struct us5182d_data {
126 struct i2c_client *client;
127 struct mutex lock;
128
129 /* Glass attenuation factor */
130 u32 ga;
131
132 /* Dark gain tuning */
133 u8 lower_dark_gain;
134 u8 upper_dark_gain;
135 u16 *us5182d_dark_ths;
136
b6695254
AR		 137 u16 px_low_th;
138 u16 px_high_th;
139
140 int rising_en;
141 int falling_en;
142
c14f8abe 143 u8 opmode;
c3304c21
AR		 144 u8 power_mode;
145
a22a3c5c
AR		 146 bool als_enabled;
147 bool px_enabled;
148
c3304c21 149 bool default_continuous;
c14f8abe
AR		 150};
151
152static IIO_CONST_ATTR(in_illuminance_scale_available,
153 "0.0021 0.0039 0.0076 0.0196 0.0336 0.061 0.1078 0.1885");
154
155static struct attribute *us5182d_attrs[] = {
156 &iio_const_attr_in_illuminance_scale_available.dev_attr.attr,
157 NULL
158};
159
160static const struct attribute_group us5182d_attr_group = {
161 .attrs = us5182d_attrs,
162};
163
164static const struct {
165 u8 reg;
166 u8 val;
167} us5182d_regvals[] = {
c3304c21 168 {US5182D_REG_CFG0, US5182D_CFG0_WORD_ENABLE},
c14f8abe
AR		 169 {US5182D_REG_CFG1, US5182D_CFG1_ALS_RES16},
170 {US5182D_REG_CFG2, (US5182D_CFG2_PX_RES16 |
171 US5182D_CFG2_PXGAIN_DEFAULT)},
b6695254
AR		 172 {US5182D_REG_CFG3, US5182D_CFG3_LED_CURRENT100 |
173 US5182D_CFG3_INT_SOURCE_PX},
c14f8abe
AR		 174 {US5182D_REG_CFG4, 0x00},
175};
176
b6695254
AR		 177static const struct iio_event_spec us5182d_events[] = {
178 {
179 .type = IIO_EV_TYPE_THRESH,
180 .dir = IIO_EV_DIR_RISING,
181 .mask_separate = BIT(IIO_EV_INFO_VALUE) |
182 BIT(IIO_EV_INFO_ENABLE),
183 },
184 {
185 .type = IIO_EV_TYPE_THRESH,
186 .dir = IIO_EV_DIR_FALLING,
187 .mask_separate = BIT(IIO_EV_INFO_VALUE) |
188 BIT(IIO_EV_INFO_ENABLE),
189 },
190};
191
c14f8abe
AR		 192static const struct iio_chan_spec us5182d_channels[] = {
193 {
194 .type = IIO_LIGHT,
195 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
196 BIT(IIO_CHAN_INFO_SCALE),
197 },
198 {
199 .type = IIO_PROXIMITY,
200 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
b6695254
AR		 201 .event_spec = us5182d_events,
202 .num_event_specs = ARRAY_SIZE(us5182d_events),
c14f8abe
AR		 203 }
204};
205
c3304c21 206static int us5182d_oneshot_en(struct us5182d_data *data)
c14f8abe
AR		 207{
208 int ret;
209
210 ret = i2c_smbus_read_byte_data(data->client, US5182D_REG_CFG0);
211 if (ret < 0)
212 return ret;
213
214 /*
215 * In oneshot mode the chip will power itself down after taking the
216 * required measurement.
217 */
218 ret = ret | US5182D_CFG0_ONESHOT_EN;
219
c3304c21
AR		 220 return i2c_smbus_write_byte_data(data->client, US5182D_REG_CFG0, ret);
221}
222
223static int us5182d_set_opmode(struct us5182d_data *data, u8 mode)
224{
225 int ret;
226
227 if (mode == data->opmode)
228 return 0;
229
230 ret = i2c_smbus_read_byte_data(data->client, US5182D_REG_CFG0);
231 if (ret < 0)
232 return ret;
233
c14f8abe
AR		 234 /* update mode */
235 ret = ret & ~US5182D_OPMODE_MASK;
236 ret = ret | (mode << US5182D_OPMODE_SHIFT);
237
238 /*
239 * After updating the operating mode, the chip requires that
240 * the operation is stored, by writing 1 in the STORE_MODE
241 * register (auto-clearing).
242 */
243 ret = i2c_smbus_write_byte_data(data->client, US5182D_REG_CFG0, ret);
244 if (ret < 0)
245 return ret;
246
c14f8abe
AR		 247 ret = i2c_smbus_write_byte_data(data->client, US5182D_REG_MODE_STORE,
248 US5182D_STORE_MODE);
249 if (ret < 0)
250 return ret;
251
252 data->opmode = mode;
253 msleep(US5182D_OPSTORE_SLEEP_TIME);
254
255 return 0;
256}
257
a22a3c5c
AR		 258static int us5182d_als_enable(struct us5182d_data *data)
259{
260 int ret;
261 u8 mode;
262
58e9042f
AR		 263 if (data->power_mode == US5182D_ONESHOT) {
264 ret = us5182d_set_opmode(data, US5182D_ALS_ONLY);
265 if (ret < 0)
266 return ret;
267 data->px_enabled = false;
268 }
a22a3c5c
AR		 269
270 if (data->als_enabled)
271 return 0;
272
273 mode = data->px_enabled ? US5182D_ALS_PX : US5182D_ALS_ONLY;
274
275 ret = us5182d_set_opmode(data, mode);
276 if (ret < 0)
277 return ret;
278
279 data->als_enabled = true;
280
281 return 0;
282}
283
284static int us5182d_px_enable(struct us5182d_data *data)
285{
286 int ret;
287 u8 mode;
288
58e9042f
AR		 289 if (data->power_mode == US5182D_ONESHOT) {
290 ret = us5182d_set_opmode(data, US5182D_PX_ONLY);
291 if (ret < 0)
292 return ret;
293 data->als_enabled = false;
294 }
a22a3c5c
AR		 295
296 if (data->px_enabled)
297 return 0;
298
299 mode = data->als_enabled ? US5182D_ALS_PX : US5182D_PX_ONLY;
300
301 ret = us5182d_set_opmode(data, mode);
302 if (ret < 0)
303 return ret;
304
305 data->px_enabled = true;
306
307 return 0;
308}
309
9b1de75b
AR		 310static int us5182d_get_als(struct us5182d_data *data)
311{
312 int ret;
313 unsigned long result;
314
315 ret = us5182d_als_enable(data);
316 if (ret < 0)
317 return ret;
318
319 ret = i2c_smbus_read_word_data(data->client,
320 US5182D_REG_ADL);
321 if (ret < 0)
322 return ret;
323
324 result = ret * data->ga / US5182D_GA_RESOLUTION;
325 if (result > 0xffff)
326 result = 0xffff;
327
328 return result;
329}
330
331static int us5182d_get_px(struct us5182d_data *data)
332{
333 int ret;
334
335 ret = us5182d_px_enable(data);
336 if (ret < 0)
337 return ret;
338
339 return i2c_smbus_read_word_data(data->client,
340 US5182D_REG_PDL);
341}
342
c3304c21
AR		 343static int us5182d_shutdown_en(struct us5182d_data *data, u8 state)
344{
345 int ret;
346
347 if (data->power_mode == US5182D_ONESHOT)
348 return 0;
349
350 ret = i2c_smbus_read_byte_data(data->client, US5182D_REG_CFG0);
351 if (ret < 0)
352 return ret;
353
354 ret = ret & ~US5182D_CFG0_SHUTDOWN_EN;
355 ret = ret | state;
356
a22a3c5c
AR		 357 ret = i2c_smbus_write_byte_data(data->client, US5182D_REG_CFG0, ret);
358 if (ret < 0)
359 return ret;
360
361 if (state & US5182D_CFG0_SHUTDOWN_EN) {
362 data->als_enabled = false;
363 data->px_enabled = false;
364 }
365
366 return ret;
c3304c21
AR		 367}
368
f0e5f57d
AR		 369
370static int us5182d_set_power_state(struct us5182d_data *data, bool on)
371{
372 int ret;
373
374 if (data->power_mode == US5182D_ONESHOT)
375 return 0;
376
377 if (on) {
378 ret = pm_runtime_get_sync(&data->client->dev);
379 if (ret < 0)
380 pm_runtime_put_noidle(&data->client->dev);
381 } else {
382 pm_runtime_mark_last_busy(&data->client->dev);
383 ret = pm_runtime_put_autosuspend(&data->client->dev);
384 }
385
386 return ret;
387}
388
9b1de75b
AR		 389static int us5182d_read_value(struct us5182d_data *data,
390 struct iio_chan_spec const *chan)
391{
392 int ret, value;
393
394 mutex_lock(&data->lock);
395
396 if (data->power_mode == US5182D_ONESHOT) {
397 ret = us5182d_oneshot_en(data);
398 if (ret < 0)
399 goto out_err;
400 }
401
402 ret = us5182d_set_power_state(data, true);
403 if (ret < 0)
404 goto out_err;
405
406 if (chan->type == IIO_LIGHT)
407 ret = us5182d_get_als(data);
408 else
409 ret = us5182d_get_px(data);
410 if (ret < 0)
411 goto out_poweroff;
412
413 value = ret;
414
415 ret = us5182d_set_power_state(data, false);
416 if (ret < 0)
417 goto out_err;
418
419 mutex_unlock(&data->lock);
420 return value;
421
422out_poweroff:
423 us5182d_set_power_state(data, false);
424out_err:
425 mutex_unlock(&data->lock);
426 return ret;
427}
428
c14f8abe
AR		 429static int us5182d_read_raw(struct iio_dev *indio_dev,
430 struct iio_chan_spec const *chan, int *val,
431 int *val2, long mask)
432{
433 struct us5182d_data *data = iio_priv(indio_dev);
434 int ret;
435
436 switch (mask) {
437 case IIO_CHAN_INFO_RAW:
9b1de75b
AR		 438 ret = us5182d_read_value(data, chan);
439 if (ret < 0)
440 return ret;
441 *val = ret;
442 return IIO_VAL_INT;
c14f8abe
AR		 443 case IIO_CHAN_INFO_SCALE:
444 ret = i2c_smbus_read_byte_data(data->client, US5182D_REG_CFG1);
445 if (ret < 0)
446 return ret;
c14f8abe
AR		 447 *val = 0;
448 *val2 = us5182d_scales[ret & US5182D_AGAIN_MASK];
c14f8abe
AR		 449 return IIO_VAL_INT_PLUS_MICRO;
450 default:
451 return -EINVAL;
452 }
c14f8abe
AR		 453}
454
455/**
456 * us5182d_update_dark_th - update Darh_Th registers
457 * @data us5182d_data structure
458 * @index index in us5182d_dark_ths array to use for the updated value
459 *
460 * Function needs to be called with a lock held because it needs two i2c write
461 * byte operations as these registers (0x27 0x28) don't work in word mode
462 * accessing.
463 */
464static int us5182d_update_dark_th(struct us5182d_data *data, int index)
465{
466 __be16 dark_th = cpu_to_be16(data->us5182d_dark_ths[index]);
467 int ret;
468
469 ret = i2c_smbus_write_byte_data(data->client, US5182D_REG_UDARK_TH,
470 ((u8 *)&dark_th)[0]);
471 if (ret < 0)
472 return ret;
473
474 return i2c_smbus_write_byte_data(data->client, US5182D_REG_UDARK_TH + 1,
475 ((u8 *)&dark_th)[1]);
476}
477
478/**
479 * us5182d_apply_scale - update the ALS scale
480 * @data us5182d_data structure
481 * @index index in us5182d_scales array to use for the updated value
482 *
483 * Function needs to be called with a lock held as we're having more than one
484 * i2c operation.
485 */
486static int us5182d_apply_scale(struct us5182d_data *data, int index)
487{
488 int ret;
489
490 ret = i2c_smbus_read_byte_data(data->client, US5182D_REG_CFG1);
491 if (ret < 0)
492 return ret;
493
494 ret = ret & (~US5182D_AGAIN_MASK);
495 ret |= index;
496
497 ret = i2c_smbus_write_byte_data(data->client, US5182D_REG_CFG1, ret);
498 if (ret < 0)
499 return ret;
500
501 return us5182d_update_dark_th(data, index);
502}
503
504static int us5182d_write_raw(struct iio_dev *indio_dev,
505 struct iio_chan_spec const *chan, int val,
506 int val2, long mask)
507{
508 struct us5182d_data *data = iio_priv(indio_dev);
509 int ret, i;
510
511 switch (mask) {
512 case IIO_CHAN_INFO_SCALE:
513 if (val != 0)
514 return -EINVAL;
515 for (i = 0; i < ARRAY_SIZE(us5182d_scales); i++)
516 if (val2 == us5182d_scales[i]) {
517 mutex_lock(&data->lock);
518 ret = us5182d_apply_scale(data, i);
519 mutex_unlock(&data->lock);
520 return ret;
521 }
522 break;
523 default:
524 return -EINVAL;
525 }
526
527 return -EINVAL;
528}
529
b6695254
AR		 530static int us5182d_setup_prox(struct iio_dev *indio_dev,
531 enum iio_event_direction dir, u16 val)
532{
533 struct us5182d_data *data = iio_priv(indio_dev);
534
535 if (dir == IIO_EV_DIR_FALLING)
536 return i2c_smbus_write_word_data(data->client,
537 US5182D_REG_PXL_TH, val);
538 else if (dir == IIO_EV_DIR_RISING)
539 return i2c_smbus_write_word_data(data->client,
540 US5182D_REG_PXH_TH, val);
541
542 return 0;
543}
544
545static int us5182d_read_thresh(struct iio_dev *indio_dev,
546 const struct iio_chan_spec *chan, enum iio_event_type type,
547 enum iio_event_direction dir, enum iio_event_info info, int *val,
548 int *val2)
549{
550 struct us5182d_data *data = iio_priv(indio_dev);
551
552 switch (dir) {
553 case IIO_EV_DIR_RISING:
554 mutex_lock(&data->lock);
555 *val = data->px_high_th;
556 mutex_unlock(&data->lock);
557 break;
558 case IIO_EV_DIR_FALLING:
559 mutex_lock(&data->lock);
560 *val = data->px_low_th;
561 mutex_unlock(&data->lock);
562 break;
563 default:
564 return -EINVAL;
565 }
566
567 return IIO_VAL_INT;
568}
569
570static int us5182d_write_thresh(struct iio_dev *indio_dev,
571 const struct iio_chan_spec *chan, enum iio_event_type type,
572 enum iio_event_direction dir, enum iio_event_info info, int val,
573 int val2)
574{
575 struct us5182d_data *data = iio_priv(indio_dev);
576 int ret;
577
578 if (val < 0 || val > USHRT_MAX || val2 != 0)
579 return -EINVAL;
580
581 switch (dir) {
582 case IIO_EV_DIR_RISING:
583 mutex_lock(&data->lock);
584 if (data->rising_en) {
585 ret = us5182d_setup_prox(indio_dev, dir, val);
586 if (ret < 0)
587 goto err;
588 }
589 data->px_high_th = val;
590 mutex_unlock(&data->lock);
591 break;
592 case IIO_EV_DIR_FALLING:
593 mutex_lock(&data->lock);
594 if (data->falling_en) {
595 ret = us5182d_setup_prox(indio_dev, dir, val);
596 if (ret < 0)
597 goto err;
598 }
599 data->px_low_th = val;
600 mutex_unlock(&data->lock);
601 break;
602 default:
603 return -EINVAL;
604 }
605
606 return 0;
607err:
608 mutex_unlock(&data->lock);
609 return ret;
610}
611
612static int us5182d_read_event_config(struct iio_dev *indio_dev,
613 const struct iio_chan_spec *chan, enum iio_event_type type,
614 enum iio_event_direction dir)
615{
616 struct us5182d_data *data = iio_priv(indio_dev);
617 int ret;
618
619 switch (dir) {
620 case IIO_EV_DIR_RISING:
621 mutex_lock(&data->lock);
622 ret = data->rising_en;
623 mutex_unlock(&data->lock);
624 break;
625 case IIO_EV_DIR_FALLING:
626 mutex_lock(&data->lock);
627 ret = data->falling_en;
628 mutex_unlock(&data->lock);
629 break;
630 default:
631 ret = -EINVAL;
632 break;
633 }
634
635 return ret;
636}
637
638static int us5182d_write_event_config(struct iio_dev *indio_dev,
639 const struct iio_chan_spec *chan, enum iio_event_type type,
640 enum iio_event_direction dir, int state)
641{
642 struct us5182d_data *data = iio_priv(indio_dev);
643 int ret;
644 u16 new_th;
645
646 mutex_lock(&data->lock);
647
648 switch (dir) {
649 case IIO_EV_DIR_RISING:
650 if (data->rising_en == state) {
651 mutex_unlock(&data->lock);
652 return 0;
653 }
654 new_th = US5182D_PXH_TH_DISABLE;
655 if (state) {
656 data->power_mode = US5182D_CONTINUOUS;
657 ret = us5182d_set_power_state(data, true);
658 if (ret < 0)
659 goto err;
660 ret = us5182d_px_enable(data);
661 if (ret < 0)
662 goto err_poweroff;
663 new_th = data->px_high_th;
664 }
665 ret = us5182d_setup_prox(indio_dev, dir, new_th);
666 if (ret < 0)
667 goto err_poweroff;
668 data->rising_en = state;
669 break;
670 case IIO_EV_DIR_FALLING:
671 if (data->falling_en == state) {
672 mutex_unlock(&data->lock);
673 return 0;
674 }
675 new_th = US5182D_PXL_TH_DISABLE;
676 if (state) {
677 data->power_mode = US5182D_CONTINUOUS;
678 ret = us5182d_set_power_state(data, true);
679 if (ret < 0)
680 goto err;
681 ret = us5182d_px_enable(data);
682 if (ret < 0)
683 goto err_poweroff;
684 new_th = data->px_low_th;
685 }
686 ret = us5182d_setup_prox(indio_dev, dir, new_th);
687 if (ret < 0)
688 goto err_poweroff;
689 data->falling_en = state;
690 break;
691 default:
692 ret = -EINVAL;
693 goto err;
694 }
695
696 if (!state) {
697 ret = us5182d_set_power_state(data, false);
698 if (ret < 0)
699 goto err;
700 }
701
702 if (!data->falling_en && !data->rising_en && !data->default_continuous)
703 data->power_mode = US5182D_ONESHOT;
704
705 mutex_unlock(&data->lock);
706 return 0;
707
708err_poweroff:
709 if (state)
710 us5182d_set_power_state(data, false);
711err:
712 mutex_unlock(&data->lock);
713 return ret;
714}
715
c14f8abe
AR		 716static const struct iio_info us5182d_info = {
717 .driver_module = THIS_MODULE,
718 .read_raw = us5182d_read_raw,
719 .write_raw = us5182d_write_raw,
720 .attrs = &us5182d_attr_group,
b6695254
AR		 721 .read_event_value = &us5182d_read_thresh,
722 .write_event_value = &us5182d_write_thresh,
723 .read_event_config = &us5182d_read_event_config,
724 .write_event_config = &us5182d_write_event_config,
c14f8abe
AR		 725};
726
727static int us5182d_reset(struct iio_dev *indio_dev)
728{
729 struct us5182d_data *data = iio_priv(indio_dev);
730
731 return i2c_smbus_write_byte_data(data->client, US5182D_REG_CFG3,
732 US5182D_RESET_CHIP);
733}
734
735static int us5182d_init(struct iio_dev *indio_dev)
736{
737 struct us5182d_data *data = iio_priv(indio_dev);
738 int i, ret;
739
740 ret = us5182d_reset(indio_dev);
741 if (ret < 0)
742 return ret;
743
744 data->opmode = 0;
c3304c21 745 data->power_mode = US5182D_CONTINUOUS;
b6695254
AR		 746 data->px_low_th = US5182D_REG_PXL_TH_DEFAULT;
747 data->px_high_th = US5182D_REG_PXH_TH_DEFAULT;
748
c14f8abe
AR		 749 for (i = 0; i < ARRAY_SIZE(us5182d_regvals); i++) {
750 ret = i2c_smbus_write_byte_data(data->client,
751 us5182d_regvals[i].reg,
752 us5182d_regvals[i].val);
753 if (ret < 0)
754 return ret;
755 }
756
a22a3c5c
AR		 757 data->als_enabled = true;
758 data->px_enabled = true;
759
c3304c21
AR		 760 if (!data->default_continuous) {
761 ret = us5182d_shutdown_en(data, US5182D_CFG0_SHUTDOWN_EN);
762 if (ret < 0)
763 return ret;
764 data->power_mode = US5182D_ONESHOT;
765 }
766
c3304c21 767 return ret;
c14f8abe
AR		 768}
769
770static void us5182d_get_platform_data(struct iio_dev *indio_dev)
771{
772 struct us5182d_data *data = iio_priv(indio_dev);
773
774 if (device_property_read_u32(&data->client->dev, "upisemi,glass-coef",
775 &data->ga))
776 data->ga = US5182D_GA_RESOLUTION;
777 if (device_property_read_u16_array(&data->client->dev,
778 "upisemi,dark-ths",
779 data->us5182d_dark_ths,
780 ARRAY_SIZE(us5182d_dark_ths_vals)))
781 data->us5182d_dark_ths = us5182d_dark_ths_vals;
782 if (device_property_read_u8(&data->client->dev,
783 "upisemi,upper-dark-gain",
784 &data->upper_dark_gain))
785 data->upper_dark_gain = US5182D_REG_AUTO_HDARK_GAIN_DEFAULT;
786 if (device_property_read_u8(&data->client->dev,
787 "upisemi,lower-dark-gain",
788 &data->lower_dark_gain))
789 data->lower_dark_gain = US5182D_REG_AUTO_LDARK_GAIN_DEFAULT;
c3304c21
AR		 790 data->default_continuous = device_property_read_bool(&data->client->dev,
791 "upisemi,continuous");
c14f8abe
AR		 792}
793
794static int us5182d_dark_gain_config(struct iio_dev *indio_dev)
795{
796 struct us5182d_data *data = iio_priv(indio_dev);
797 int ret;
798
799 ret = us5182d_update_dark_th(data, US5182D_CFG1_AGAIN_DEFAULT);
800 if (ret < 0)
801 return ret;
802
803 ret = i2c_smbus_write_byte_data(data->client,
804 US5182D_REG_AUTO_LDARK_GAIN,
805 data->lower_dark_gain);
806 if (ret < 0)
807 return ret;
808
809 ret = i2c_smbus_write_byte_data(data->client,
810 US5182D_REG_AUTO_HDARK_GAIN,
811 data->upper_dark_gain);
812 if (ret < 0)
813 return ret;
814
815 return i2c_smbus_write_byte_data(data->client, US5182D_REG_DARK_AUTO_EN,
816 US5182D_REG_DARK_AUTO_EN_DEFAULT);
817}
818
b6695254
AR		 819static irqreturn_t us5182d_irq_thread_handler(int irq, void *private)
820{
821 struct iio_dev *indio_dev = private;
822 struct us5182d_data *data = iio_priv(indio_dev);
823 enum iio_event_direction dir;
824 int ret;
825 u64 ev;
826
827 ret = i2c_smbus_read_byte_data(data->client, US5182D_REG_CFG0);
828 if (ret < 0) {
829 dev_err(&data->client->dev, "i2c transfer error in irq\n");
830 return IRQ_HANDLED;
831 }
832
833 dir = ret & US5182D_CFG0_PROX ? IIO_EV_DIR_RISING : IIO_EV_DIR_FALLING;
834 ev = IIO_UNMOD_EVENT_CODE(IIO_PROXIMITY, 1, IIO_EV_TYPE_THRESH, dir);
835
bc2b7dab 836 iio_push_event(indio_dev, ev, iio_get_time_ns(indio_dev));
b6695254
AR		 837
838 ret = i2c_smbus_write_byte_data(data->client, US5182D_REG_CFG0,
839 ret & ~US5182D_CFG0_PX_IRQ);
840 if (ret < 0)
841 dev_err(&data->client->dev, "i2c transfer error in irq\n");
842
843 return IRQ_HANDLED;
844}
845
c14f8abe
AR		 846static int us5182d_probe(struct i2c_client *client,
847 const struct i2c_device_id *id)
848{
849 struct us5182d_data *data;
850 struct iio_dev *indio_dev;
851 int ret;
852
853 indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data));
854 if (!indio_dev)
855 return -ENOMEM;
856
857 data = iio_priv(indio_dev);
858 i2c_set_clientdata(client, indio_dev);
859 data->client = client;
860
861 mutex_init(&data->lock);
862
863 indio_dev->dev.parent = &client->dev;
864 indio_dev->info = &us5182d_info;
865 indio_dev->name = US5182D_DRV_NAME;
866 indio_dev->channels = us5182d_channels;
867 indio_dev->num_channels = ARRAY_SIZE(us5182d_channels);
868 indio_dev->modes = INDIO_DIRECT_MODE;
869
870 ret = i2c_smbus_read_byte_data(data->client, US5182D_REG_CHIPID);
871 if (ret != US5182D_CHIPID) {
872 dev_err(&data->client->dev,
873 "Failed to detect US5182 light chip\n");
874 return (ret < 0) ? ret : -ENODEV;
875 }
876
b6695254
AR		 877 if (client->irq > 0) {
878 ret = devm_request_threaded_irq(&client->dev, client->irq, NULL,
879 us5182d_irq_thread_handler,
880 IRQF_TRIGGER_LOW | IRQF_ONESHOT,
881 "us5182d-irq", indio_dev);
882 if (ret < 0)
883 return ret;
884 } else
885 dev_warn(&client->dev, "no valid irq found\n");
886
c14f8abe
AR		 887 us5182d_get_platform_data(indio_dev);
888 ret = us5182d_init(indio_dev);
889 if (ret < 0)
890 return ret;
891
892 ret = us5182d_dark_gain_config(indio_dev);
893 if (ret < 0)
c3304c21
AR		 894 goto out_err;
895
f0e5f57d 896 if (data->default_continuous) {
281269f8 897 ret = pm_runtime_set_active(&client->dev);
f0e5f57d
AR		 898 if (ret < 0)
899 goto out_err;
900 }
901
902 pm_runtime_enable(&client->dev);
903 pm_runtime_set_autosuspend_delay(&client->dev,
904 US5182D_SLEEP_MS);
905 pm_runtime_use_autosuspend(&client->dev);
906
c3304c21
AR		 907 ret = iio_device_register(indio_dev);
908 if (ret < 0)
909 goto out_err;
910
911 return 0;
912
913out_err:
914 us5182d_shutdown_en(data, US5182D_CFG0_SHUTDOWN_EN);
915 return ret;
c14f8abe 916
c14f8abe
AR		 917}
918
919static int us5182d_remove(struct i2c_client *client)
920{
c3304c21
AR		 921 struct us5182d_data *data = iio_priv(i2c_get_clientdata(client));
922
c14f8abe 923 iio_device_unregister(i2c_get_clientdata(client));
c3304c21 924
f0e5f57d
AR		 925 pm_runtime_disable(&client->dev);
926 pm_runtime_set_suspended(&client->dev);
927
c3304c21 928 return us5182d_shutdown_en(data, US5182D_CFG0_SHUTDOWN_EN);
c14f8abe
AR		 929}
930
f0e5f57d
AR		 931#if defined(CONFIG_PM_SLEEP) || defined(CONFIG_PM)
932static int us5182d_suspend(struct device *dev)
933{
934 struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
935 struct us5182d_data *data = iio_priv(indio_dev);
936
937 if (data->power_mode == US5182D_CONTINUOUS)
938 return us5182d_shutdown_en(data, US5182D_CFG0_SHUTDOWN_EN);
939
940 return 0;
941}
942
943static int us5182d_resume(struct device *dev)
944{
945 struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
946 struct us5182d_data *data = iio_priv(indio_dev);
947
948 if (data->power_mode == US5182D_CONTINUOUS)
949 return us5182d_shutdown_en(data,
950 ~US5182D_CFG0_SHUTDOWN_EN & 0xff);
951
952 return 0;
953}
954#endif
955
956static const struct dev_pm_ops us5182d_pm_ops = {
957 SET_SYSTEM_SLEEP_PM_OPS(us5182d_suspend, us5182d_resume)
958 SET_RUNTIME_PM_OPS(us5182d_suspend, us5182d_resume, NULL)
959};
960
c14f8abe
AR		 961static const struct acpi_device_id us5182d_acpi_match[] = {
962 { "USD5182", 0},
963 {}
964};
965
966MODULE_DEVICE_TABLE(acpi, us5182d_acpi_match);
967
968static const struct i2c_device_id us5182d_id[] = {
969 {"usd5182", 0},
970 {}
971};
972
973MODULE_DEVICE_TABLE(i2c, us5182d_id);
974
975static struct i2c_driver us5182d_driver = {
976 .driver = {
977 .name = US5182D_DRV_NAME,
f0e5f57d 978 .pm = &us5182d_pm_ops,
c14f8abe
AR		 979 .acpi_match_table = ACPI_PTR(us5182d_acpi_match),
980 },
981 .probe = us5182d_probe,
982 .remove = us5182d_remove,
983 .id_table = us5182d_id,
984
985};
986module_i2c_driver(us5182d_driver);
987
988MODULE_AUTHOR("Adriana Reus <adriana.reus@intel.com>");
989MODULE_DESCRIPTION("Driver for us5182d Proximity and Light Sensor");
990MODULE_LICENSE("GPL v2");
Linux kernel - Deliverables
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