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[mirror_ubuntu-bionic-kernel.git] / drivers / iio / proximity / sx9500.c
1 /*
2 * Copyright (c) 2014 Intel Corporation
3 *
4 * Driver for Semtech's SX9500 capacitive proximity/button solution.
5 * Datasheet available at
6 * <http://www.semtech.com/images/datasheet/sx9500.pdf>.
7 *
8 * This program is free software; you can redistribute it and/or modify it
9 * under the terms of the GNU General Public License version 2 as published by
10 * the Free Software Foundation.
11 */
12
13 #include <linux/kernel.h>
14 #include <linux/slab.h>
15 #include <linux/module.h>
16 #include <linux/i2c.h>
17 #include <linux/irq.h>
18 #include <linux/acpi.h>
19 #include <linux/gpio/consumer.h>
20 #include <linux/regmap.h>
21 #include <linux/pm.h>
22 #include <linux/delay.h>
23
24 #include <linux/iio/iio.h>
25 #include <linux/iio/buffer.h>
26 #include <linux/iio/sysfs.h>
27 #include <linux/iio/events.h>
28 #include <linux/iio/trigger.h>
29 #include <linux/iio/triggered_buffer.h>
30 #include <linux/iio/trigger_consumer.h>
31
32 #define SX9500_DRIVER_NAME "sx9500"
33 #define SX9500_IRQ_NAME "sx9500_event"
34
35 #define SX9500_GPIO_INT "interrupt"
36 #define SX9500_GPIO_RESET "reset"
37
38 /* Register definitions. */
39 #define SX9500_REG_IRQ_SRC 0x00
40 #define SX9500_REG_STAT 0x01
41 #define SX9500_REG_IRQ_MSK 0x03
42
43 #define SX9500_REG_PROX_CTRL0 0x06
44 #define SX9500_REG_PROX_CTRL1 0x07
45 #define SX9500_REG_PROX_CTRL2 0x08
46 #define SX9500_REG_PROX_CTRL3 0x09
47 #define SX9500_REG_PROX_CTRL4 0x0a
48 #define SX9500_REG_PROX_CTRL5 0x0b
49 #define SX9500_REG_PROX_CTRL6 0x0c
50 #define SX9500_REG_PROX_CTRL7 0x0d
51 #define SX9500_REG_PROX_CTRL8 0x0e
52
53 #define SX9500_REG_SENSOR_SEL 0x20
54 #define SX9500_REG_USE_MSB 0x21
55 #define SX9500_REG_USE_LSB 0x22
56 #define SX9500_REG_AVG_MSB 0x23
57 #define SX9500_REG_AVG_LSB 0x24
58 #define SX9500_REG_DIFF_MSB 0x25
59 #define SX9500_REG_DIFF_LSB 0x26
60 #define SX9500_REG_OFFSET_MSB 0x27
61 #define SX9500_REG_OFFSET_LSB 0x28
62
63 #define SX9500_REG_RESET 0x7f
64
65 /* Write this to REG_RESET to do a soft reset. */
66 #define SX9500_SOFT_RESET 0xde
67
68 #define SX9500_SCAN_PERIOD_MASK GENMASK(6, 4)
69 #define SX9500_SCAN_PERIOD_SHIFT 4
70
71 /*
72 * These serve for identifying IRQ source in the IRQ_SRC register, and
73 * also for masking the IRQs in the IRQ_MSK register.
74 */
75 #define SX9500_CLOSE_IRQ BIT(6)
76 #define SX9500_FAR_IRQ BIT(5)
77 #define SX9500_CONVDONE_IRQ BIT(3)
78
79 #define SX9500_PROXSTAT_SHIFT 4
80 #define SX9500_COMPSTAT_MASK GENMASK(3, 0)
81
82 #define SX9500_NUM_CHANNELS 4
83 #define SX9500_CHAN_MASK GENMASK(SX9500_NUM_CHANNELS - 1, 0)
84
85 struct sx9500_data {
86 struct mutex mutex;
87 struct i2c_client *client;
88 struct iio_trigger *trig;
89 struct regmap *regmap;
90 struct gpio_desc *gpiod_rst;
91 /*
92 * Last reading of the proximity status for each channel. We
93 * only send an event to user space when this changes.
94 */
95 bool prox_stat[SX9500_NUM_CHANNELS];
96 bool event_enabled[SX9500_NUM_CHANNELS];
97 bool trigger_enabled;
98 u16 *buffer;
99 /* Remember enabled channels and sample rate during suspend. */
100 unsigned int suspend_ctrl0;
101 struct completion completion;
102 int data_rdy_users, close_far_users;
103 int channel_users[SX9500_NUM_CHANNELS];
104 };
105
106 static const struct iio_event_spec sx9500_events[] = {
107 {
108 .type = IIO_EV_TYPE_THRESH,
109 .dir = IIO_EV_DIR_EITHER,
110 .mask_separate = BIT(IIO_EV_INFO_ENABLE),
111 },
112 };
113
114 #define SX9500_CHANNEL(idx) \
115 { \
116 .type = IIO_PROXIMITY, \
117 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \
118 .info_mask_shared_by_all = BIT(IIO_CHAN_INFO_SAMP_FREQ), \
119 .indexed = 1, \
120 .channel = idx, \
121 .event_spec = sx9500_events, \
122 .num_event_specs = ARRAY_SIZE(sx9500_events), \
123 .scan_index = idx, \
124 .scan_type = { \
125 .sign = 'u', \
126 .realbits = 16, \
127 .storagebits = 16, \
128 .shift = 0, \
129 }, \
130 }
131
132 static const struct iio_chan_spec sx9500_channels[] = {
133 SX9500_CHANNEL(0),
134 SX9500_CHANNEL(1),
135 SX9500_CHANNEL(2),
136 SX9500_CHANNEL(3),
137 IIO_CHAN_SOFT_TIMESTAMP(4),
138 };
139
140 static const struct {
141 int val;
142 int val2;
143 } sx9500_samp_freq_table[] = {
144 {33, 333333},
145 {16, 666666},
146 {11, 111111},
147 {8, 333333},
148 {6, 666666},
149 {5, 0},
150 {3, 333333},
151 {2, 500000},
152 };
153
154 static const unsigned int sx9500_scan_period_table[] = {
155 30, 60, 90, 120, 150, 200, 300, 400,
156 };
157
158 static const struct regmap_range sx9500_writable_reg_ranges[] = {
159 regmap_reg_range(SX9500_REG_IRQ_MSK, SX9500_REG_IRQ_MSK),
160 regmap_reg_range(SX9500_REG_PROX_CTRL0, SX9500_REG_PROX_CTRL8),
161 regmap_reg_range(SX9500_REG_SENSOR_SEL, SX9500_REG_SENSOR_SEL),
162 regmap_reg_range(SX9500_REG_OFFSET_MSB, SX9500_REG_OFFSET_LSB),
163 regmap_reg_range(SX9500_REG_RESET, SX9500_REG_RESET),
164 };
165
166 static const struct regmap_access_table sx9500_writeable_regs = {
167 .yes_ranges = sx9500_writable_reg_ranges,
168 .n_yes_ranges = ARRAY_SIZE(sx9500_writable_reg_ranges),
169 };
170
171 /*
172 * All allocated registers are readable, so we just list unallocated
173 * ones.
174 */
175 static const struct regmap_range sx9500_non_readable_reg_ranges[] = {
176 regmap_reg_range(SX9500_REG_STAT + 1, SX9500_REG_STAT + 1),
177 regmap_reg_range(SX9500_REG_IRQ_MSK + 1, SX9500_REG_PROX_CTRL0 - 1),
178 regmap_reg_range(SX9500_REG_PROX_CTRL8 + 1, SX9500_REG_SENSOR_SEL - 1),
179 regmap_reg_range(SX9500_REG_OFFSET_LSB + 1, SX9500_REG_RESET - 1),
180 };
181
182 static const struct regmap_access_table sx9500_readable_regs = {
183 .no_ranges = sx9500_non_readable_reg_ranges,
184 .n_no_ranges = ARRAY_SIZE(sx9500_non_readable_reg_ranges),
185 };
186
187 static const struct regmap_range sx9500_volatile_reg_ranges[] = {
188 regmap_reg_range(SX9500_REG_IRQ_SRC, SX9500_REG_STAT),
189 regmap_reg_range(SX9500_REG_USE_MSB, SX9500_REG_OFFSET_LSB),
190 regmap_reg_range(SX9500_REG_RESET, SX9500_REG_RESET),
191 };
192
193 static const struct regmap_access_table sx9500_volatile_regs = {
194 .yes_ranges = sx9500_volatile_reg_ranges,
195 .n_yes_ranges = ARRAY_SIZE(sx9500_volatile_reg_ranges),
196 };
197
198 static const struct regmap_config sx9500_regmap_config = {
199 .reg_bits = 8,
200 .val_bits = 8,
201
202 .max_register = SX9500_REG_RESET,
203 .cache_type = REGCACHE_RBTREE,
204
205 .wr_table = &sx9500_writeable_regs,
206 .rd_table = &sx9500_readable_regs,
207 .volatile_table = &sx9500_volatile_regs,
208 };
209
210 static int sx9500_inc_users(struct sx9500_data *data, int *counter,
211 unsigned int reg, unsigned int bitmask)
212 {
213 (*counter)++;
214 if (*counter != 1)
215 /* Bit is already active, nothing to do. */
216 return 0;
217
218 return regmap_update_bits(data->regmap, reg, bitmask, bitmask);
219 }
220
221 static int sx9500_dec_users(struct sx9500_data *data, int *counter,
222 unsigned int reg, unsigned int bitmask)
223 {
224 (*counter)--;
225 if (*counter != 0)
226 /* There are more users, do not deactivate. */
227 return 0;
228
229 return regmap_update_bits(data->regmap, reg, bitmask, 0);
230 }
231
232 static int sx9500_inc_chan_users(struct sx9500_data *data, int chan)
233 {
234 return sx9500_inc_users(data, &data->channel_users[chan],
235 SX9500_REG_PROX_CTRL0, BIT(chan));
236 }
237
238 static int sx9500_dec_chan_users(struct sx9500_data *data, int chan)
239 {
240 return sx9500_dec_users(data, &data->channel_users[chan],
241 SX9500_REG_PROX_CTRL0, BIT(chan));
242 }
243
244 static int sx9500_inc_data_rdy_users(struct sx9500_data *data)
245 {
246 return sx9500_inc_users(data, &data->data_rdy_users,
247 SX9500_REG_IRQ_MSK, SX9500_CONVDONE_IRQ);
248 }
249
250 static int sx9500_dec_data_rdy_users(struct sx9500_data *data)
251 {
252 return sx9500_dec_users(data, &data->data_rdy_users,
253 SX9500_REG_IRQ_MSK, SX9500_CONVDONE_IRQ);
254 }
255
256 static int sx9500_inc_close_far_users(struct sx9500_data *data)
257 {
258 return sx9500_inc_users(data, &data->close_far_users,
259 SX9500_REG_IRQ_MSK,
260 SX9500_CLOSE_IRQ | SX9500_FAR_IRQ);
261 }
262
263 static int sx9500_dec_close_far_users(struct sx9500_data *data)
264 {
265 return sx9500_dec_users(data, &data->close_far_users,
266 SX9500_REG_IRQ_MSK,
267 SX9500_CLOSE_IRQ | SX9500_FAR_IRQ);
268 }
269
270 static int sx9500_read_prox_data(struct sx9500_data *data,
271 const struct iio_chan_spec *chan,
272 int *val)
273 {
274 int ret;
275 __be16 regval;
276
277 ret = regmap_write(data->regmap, SX9500_REG_SENSOR_SEL, chan->channel);
278 if (ret < 0)
279 return ret;
280
281 ret = regmap_bulk_read(data->regmap, SX9500_REG_USE_MSB, &regval, 2);
282 if (ret < 0)
283 return ret;
284
285 *val = be16_to_cpu(regval);
286
287 return IIO_VAL_INT;
288 }
289
290 /*
291 * If we have no interrupt support, we have to wait for a scan period
292 * after enabling a channel to get a result.
293 */
294 static int sx9500_wait_for_sample(struct sx9500_data *data)
295 {
296 int ret;
297 unsigned int val;
298
299 ret = regmap_read(data->regmap, SX9500_REG_PROX_CTRL0, &val);
300 if (ret < 0)
301 return ret;
302
303 val = (val & SX9500_SCAN_PERIOD_MASK) >> SX9500_SCAN_PERIOD_SHIFT;
304
305 msleep(sx9500_scan_period_table[val]);
306
307 return 0;
308 }
309
310 static int sx9500_read_proximity(struct sx9500_data *data,
311 const struct iio_chan_spec *chan,
312 int *val)
313 {
314 int ret;
315
316 mutex_lock(&data->mutex);
317
318 ret = sx9500_inc_chan_users(data, chan->channel);
319 if (ret < 0)
320 goto out;
321
322 ret = sx9500_inc_data_rdy_users(data);
323 if (ret < 0)
324 goto out_dec_chan;
325
326 mutex_unlock(&data->mutex);
327
328 if (data->client->irq > 0)
329 ret = wait_for_completion_interruptible(&data->completion);
330 else
331 ret = sx9500_wait_for_sample(data);
332
333 mutex_lock(&data->mutex);
334
335 if (ret < 0)
336 goto out_dec_data_rdy;
337
338 ret = sx9500_read_prox_data(data, chan, val);
339 if (ret < 0)
340 goto out_dec_data_rdy;
341
342 ret = sx9500_dec_data_rdy_users(data);
343 if (ret < 0)
344 goto out_dec_chan;
345
346 ret = sx9500_dec_chan_users(data, chan->channel);
347 if (ret < 0)
348 goto out;
349
350 ret = IIO_VAL_INT;
351
352 goto out;
353
354 out_dec_data_rdy:
355 sx9500_dec_data_rdy_users(data);
356 out_dec_chan:
357 sx9500_dec_chan_users(data, chan->channel);
358 out:
359 mutex_unlock(&data->mutex);
360 reinit_completion(&data->completion);
361
362 return ret;
363 }
364
365 static int sx9500_read_samp_freq(struct sx9500_data *data,
366 int *val, int *val2)
367 {
368 int ret;
369 unsigned int regval;
370
371 mutex_lock(&data->mutex);
372 ret = regmap_read(data->regmap, SX9500_REG_PROX_CTRL0, &regval);
373 mutex_unlock(&data->mutex);
374
375 if (ret < 0)
376 return ret;
377
378 regval = (regval & SX9500_SCAN_PERIOD_MASK) >> SX9500_SCAN_PERIOD_SHIFT;
379 *val = sx9500_samp_freq_table[regval].val;
380 *val2 = sx9500_samp_freq_table[regval].val2;
381
382 return IIO_VAL_INT_PLUS_MICRO;
383 }
384
385 static int sx9500_read_raw(struct iio_dev *indio_dev,
386 const struct iio_chan_spec *chan,
387 int *val, int *val2, long mask)
388 {
389 struct sx9500_data *data = iio_priv(indio_dev);
390 int ret;
391
392 switch (chan->type) {
393 case IIO_PROXIMITY:
394 switch (mask) {
395 case IIO_CHAN_INFO_RAW:
396 ret = iio_device_claim_direct_mode(indio_dev);
397 if (ret)
398 return ret;
399 ret = sx9500_read_proximity(data, chan, val);
400 iio_device_release_direct_mode(indio_dev);
401 return ret;
402 case IIO_CHAN_INFO_SAMP_FREQ:
403 return sx9500_read_samp_freq(data, val, val2);
404 default:
405 return -EINVAL;
406 }
407 default:
408 return -EINVAL;
409 }
410 }
411
412 static int sx9500_set_samp_freq(struct sx9500_data *data,
413 int val, int val2)
414 {
415 int i, ret;
416
417 for (i = 0; i < ARRAY_SIZE(sx9500_samp_freq_table); i++)
418 if (val == sx9500_samp_freq_table[i].val &&
419 val2 == sx9500_samp_freq_table[i].val2)
420 break;
421
422 if (i == ARRAY_SIZE(sx9500_samp_freq_table))
423 return -EINVAL;
424
425 mutex_lock(&data->mutex);
426
427 ret = regmap_update_bits(data->regmap, SX9500_REG_PROX_CTRL0,
428 SX9500_SCAN_PERIOD_MASK,
429 i << SX9500_SCAN_PERIOD_SHIFT);
430
431 mutex_unlock(&data->mutex);
432
433 return ret;
434 }
435
436 static int sx9500_write_raw(struct iio_dev *indio_dev,
437 const struct iio_chan_spec *chan,
438 int val, int val2, long mask)
439 {
440 struct sx9500_data *data = iio_priv(indio_dev);
441
442 switch (chan->type) {
443 case IIO_PROXIMITY:
444 switch (mask) {
445 case IIO_CHAN_INFO_SAMP_FREQ:
446 return sx9500_set_samp_freq(data, val, val2);
447 default:
448 return -EINVAL;
449 }
450 default:
451 return -EINVAL;
452 }
453 }
454
455 static irqreturn_t sx9500_irq_handler(int irq, void *private)
456 {
457 struct iio_dev *indio_dev = private;
458 struct sx9500_data *data = iio_priv(indio_dev);
459
460 if (data->trigger_enabled)
461 iio_trigger_poll(data->trig);
462
463 /*
464 * Even if no event is enabled, we need to wake the thread to
465 * clear the interrupt state by reading SX9500_REG_IRQ_SRC. It
466 * is not possible to do that here because regmap_read takes a
467 * mutex.
468 */
469 return IRQ_WAKE_THREAD;
470 }
471
472 static void sx9500_push_events(struct iio_dev *indio_dev)
473 {
474 int ret;
475 unsigned int val, chan;
476 struct sx9500_data *data = iio_priv(indio_dev);
477
478 ret = regmap_read(data->regmap, SX9500_REG_STAT, &val);
479 if (ret < 0) {
480 dev_err(&data->client->dev, "i2c transfer error in irq\n");
481 return;
482 }
483
484 val >>= SX9500_PROXSTAT_SHIFT;
485 for (chan = 0; chan < SX9500_NUM_CHANNELS; chan++) {
486 int dir;
487 u64 ev;
488 bool new_prox = val & BIT(chan);
489
490 if (!data->event_enabled[chan])
491 continue;
492 if (new_prox == data->prox_stat[chan])
493 /* No change on this channel. */
494 continue;
495
496 dir = new_prox ? IIO_EV_DIR_FALLING : IIO_EV_DIR_RISING;
497 ev = IIO_UNMOD_EVENT_CODE(IIO_PROXIMITY, chan,
498 IIO_EV_TYPE_THRESH, dir);
499 iio_push_event(indio_dev, ev, iio_get_time_ns(indio_dev));
500 data->prox_stat[chan] = new_prox;
501 }
502 }
503
504 static irqreturn_t sx9500_irq_thread_handler(int irq, void *private)
505 {
506 struct iio_dev *indio_dev = private;
507 struct sx9500_data *data = iio_priv(indio_dev);
508 int ret;
509 unsigned int val;
510
511 mutex_lock(&data->mutex);
512
513 ret = regmap_read(data->regmap, SX9500_REG_IRQ_SRC, &val);
514 if (ret < 0) {
515 dev_err(&data->client->dev, "i2c transfer error in irq\n");
516 goto out;
517 }
518
519 if (val & (SX9500_CLOSE_IRQ | SX9500_FAR_IRQ))
520 sx9500_push_events(indio_dev);
521
522 if (val & SX9500_CONVDONE_IRQ)
523 complete(&data->completion);
524
525 out:
526 mutex_unlock(&data->mutex);
527
528 return IRQ_HANDLED;
529 }
530
531 static int sx9500_read_event_config(struct iio_dev *indio_dev,
532 const struct iio_chan_spec *chan,
533 enum iio_event_type type,
534 enum iio_event_direction dir)
535 {
536 struct sx9500_data *data = iio_priv(indio_dev);
537
538 if (chan->type != IIO_PROXIMITY || type != IIO_EV_TYPE_THRESH ||
539 dir != IIO_EV_DIR_EITHER)
540 return -EINVAL;
541
542 return data->event_enabled[chan->channel];
543 }
544
545 static int sx9500_write_event_config(struct iio_dev *indio_dev,
546 const struct iio_chan_spec *chan,
547 enum iio_event_type type,
548 enum iio_event_direction dir,
549 int state)
550 {
551 struct sx9500_data *data = iio_priv(indio_dev);
552 int ret;
553
554 if (chan->type != IIO_PROXIMITY || type != IIO_EV_TYPE_THRESH ||
555 dir != IIO_EV_DIR_EITHER)
556 return -EINVAL;
557
558 mutex_lock(&data->mutex);
559
560 if (state == 1) {
561 ret = sx9500_inc_chan_users(data, chan->channel);
562 if (ret < 0)
563 goto out_unlock;
564 ret = sx9500_inc_close_far_users(data);
565 if (ret < 0)
566 goto out_undo_chan;
567 } else {
568 ret = sx9500_dec_chan_users(data, chan->channel);
569 if (ret < 0)
570 goto out_unlock;
571 ret = sx9500_dec_close_far_users(data);
572 if (ret < 0)
573 goto out_undo_chan;
574 }
575
576 data->event_enabled[chan->channel] = state;
577 goto out_unlock;
578
579 out_undo_chan:
580 if (state == 1)
581 sx9500_dec_chan_users(data, chan->channel);
582 else
583 sx9500_inc_chan_users(data, chan->channel);
584 out_unlock:
585 mutex_unlock(&data->mutex);
586 return ret;
587 }
588
589 static int sx9500_update_scan_mode(struct iio_dev *indio_dev,
590 const unsigned long *scan_mask)
591 {
592 struct sx9500_data *data = iio_priv(indio_dev);
593
594 mutex_lock(&data->mutex);
595 kfree(data->buffer);
596 data->buffer = kzalloc(indio_dev->scan_bytes, GFP_KERNEL);
597 mutex_unlock(&data->mutex);
598
599 if (data->buffer == NULL)
600 return -ENOMEM;
601
602 return 0;
603 }
604
605 static IIO_CONST_ATTR_SAMP_FREQ_AVAIL(
606 "2.500000 3.333333 5 6.666666 8.333333 11.111111 16.666666 33.333333");
607
608 static struct attribute *sx9500_attributes[] = {
609 &iio_const_attr_sampling_frequency_available.dev_attr.attr,
610 NULL,
611 };
612
613 static const struct attribute_group sx9500_attribute_group = {
614 .attrs = sx9500_attributes,
615 };
616
617 static const struct iio_info sx9500_info = {
618 .driver_module = THIS_MODULE,
619 .attrs = &sx9500_attribute_group,
620 .read_raw = &sx9500_read_raw,
621 .write_raw = &sx9500_write_raw,
622 .read_event_config = &sx9500_read_event_config,
623 .write_event_config = &sx9500_write_event_config,
624 .update_scan_mode = &sx9500_update_scan_mode,
625 };
626
627 static int sx9500_set_trigger_state(struct iio_trigger *trig,
628 bool state)
629 {
630 struct iio_dev *indio_dev = iio_trigger_get_drvdata(trig);
631 struct sx9500_data *data = iio_priv(indio_dev);
632 int ret;
633
634 mutex_lock(&data->mutex);
635
636 if (state)
637 ret = sx9500_inc_data_rdy_users(data);
638 else
639 ret = sx9500_dec_data_rdy_users(data);
640 if (ret < 0)
641 goto out;
642
643 data->trigger_enabled = state;
644
645 out:
646 mutex_unlock(&data->mutex);
647
648 return ret;
649 }
650
651 static const struct iio_trigger_ops sx9500_trigger_ops = {
652 .set_trigger_state = sx9500_set_trigger_state,
653 .owner = THIS_MODULE,
654 };
655
656 static irqreturn_t sx9500_trigger_handler(int irq, void *private)
657 {
658 struct iio_poll_func *pf = private;
659 struct iio_dev *indio_dev = pf->indio_dev;
660 struct sx9500_data *data = iio_priv(indio_dev);
661 int val, bit, ret, i = 0;
662
663 mutex_lock(&data->mutex);
664
665 for_each_set_bit(bit, indio_dev->active_scan_mask,
666 indio_dev->masklength) {
667 ret = sx9500_read_prox_data(data, &indio_dev->channels[bit],
668 &val);
669 if (ret < 0)
670 goto out;
671
672 data->buffer[i++] = val;
673 }
674
675 iio_push_to_buffers_with_timestamp(indio_dev, data->buffer,
676 iio_get_time_ns(indio_dev));
677
678 out:
679 mutex_unlock(&data->mutex);
680
681 iio_trigger_notify_done(indio_dev->trig);
682
683 return IRQ_HANDLED;
684 }
685
686 static int sx9500_buffer_preenable(struct iio_dev *indio_dev)
687 {
688 struct sx9500_data *data = iio_priv(indio_dev);
689 int ret = 0, i;
690
691 mutex_lock(&data->mutex);
692
693 for (i = 0; i < SX9500_NUM_CHANNELS; i++)
694 if (test_bit(i, indio_dev->active_scan_mask)) {
695 ret = sx9500_inc_chan_users(data, i);
696 if (ret)
697 break;
698 }
699
700 if (ret)
701 for (i = i - 1; i >= 0; i--)
702 if (test_bit(i, indio_dev->active_scan_mask))
703 sx9500_dec_chan_users(data, i);
704
705 mutex_unlock(&data->mutex);
706
707 return ret;
708 }
709
710 static int sx9500_buffer_predisable(struct iio_dev *indio_dev)
711 {
712 struct sx9500_data *data = iio_priv(indio_dev);
713 int ret = 0, i;
714
715 iio_triggered_buffer_predisable(indio_dev);
716
717 mutex_lock(&data->mutex);
718
719 for (i = 0; i < SX9500_NUM_CHANNELS; i++)
720 if (test_bit(i, indio_dev->active_scan_mask)) {
721 ret = sx9500_dec_chan_users(data, i);
722 if (ret)
723 break;
724 }
725
726 if (ret)
727 for (i = i - 1; i >= 0; i--)
728 if (test_bit(i, indio_dev->active_scan_mask))
729 sx9500_inc_chan_users(data, i);
730
731 mutex_unlock(&data->mutex);
732
733 return ret;
734 }
735
736 static const struct iio_buffer_setup_ops sx9500_buffer_setup_ops = {
737 .preenable = sx9500_buffer_preenable,
738 .postenable = iio_triggered_buffer_postenable,
739 .predisable = sx9500_buffer_predisable,
740 };
741
742 struct sx9500_reg_default {
743 u8 reg;
744 u8 def;
745 };
746
747 static const struct sx9500_reg_default sx9500_default_regs[] = {
748 {
749 .reg = SX9500_REG_PROX_CTRL1,
750 /* Shield enabled, small range. */
751 .def = 0x43,
752 },
753 {
754 .reg = SX9500_REG_PROX_CTRL2,
755 /* x8 gain, 167kHz frequency, finest resolution. */
756 .def = 0x77,
757 },
758 {
759 .reg = SX9500_REG_PROX_CTRL3,
760 /* Doze enabled, 2x scan period doze, no raw filter. */
761 .def = 0x40,
762 },
763 {
764 .reg = SX9500_REG_PROX_CTRL4,
765 /* Average threshold. */
766 .def = 0x30,
767 },
768 {
769 .reg = SX9500_REG_PROX_CTRL5,
770 /*
771 * Debouncer off, lowest average negative filter,
772 * highest average postive filter.
773 */
774 .def = 0x0f,
775 },
776 {
777 .reg = SX9500_REG_PROX_CTRL6,
778 /* Proximity detection threshold: 280 */
779 .def = 0x0e,
780 },
781 {
782 .reg = SX9500_REG_PROX_CTRL7,
783 /*
784 * No automatic compensation, compensate each pin
785 * independently, proximity hysteresis: 32, close
786 * debouncer off, far debouncer off.
787 */
788 .def = 0x00,
789 },
790 {
791 .reg = SX9500_REG_PROX_CTRL8,
792 /* No stuck timeout, no periodic compensation. */
793 .def = 0x00,
794 },
795 {
796 .reg = SX9500_REG_PROX_CTRL0,
797 /* Scan period: 30ms, all sensors disabled. */
798 .def = 0x00,
799 },
800 };
801
802 /* Activate all channels and perform an initial compensation. */
803 static int sx9500_init_compensation(struct iio_dev *indio_dev)
804 {
805 struct sx9500_data *data = iio_priv(indio_dev);
806 int i, ret;
807 unsigned int val;
808
809 ret = regmap_update_bits(data->regmap, SX9500_REG_PROX_CTRL0,
810 SX9500_CHAN_MASK, SX9500_CHAN_MASK);
811 if (ret < 0)
812 return ret;
813
814 for (i = 10; i >= 0; i--) {
815 usleep_range(10000, 20000);
816 ret = regmap_read(data->regmap, SX9500_REG_STAT, &val);
817 if (ret < 0)
818 goto out;
819 if (!(val & SX9500_COMPSTAT_MASK))
820 break;
821 }
822
823 if (i < 0) {
824 dev_err(&data->client->dev, "initial compensation timed out");
825 ret = -ETIMEDOUT;
826 }
827
828 out:
829 regmap_update_bits(data->regmap, SX9500_REG_PROX_CTRL0,
830 SX9500_CHAN_MASK, 0);
831 return ret;
832 }
833
834 static int sx9500_init_device(struct iio_dev *indio_dev)
835 {
836 struct sx9500_data *data = iio_priv(indio_dev);
837 int ret, i;
838 unsigned int val;
839
840 if (data->gpiod_rst) {
841 gpiod_set_value_cansleep(data->gpiod_rst, 0);
842 usleep_range(1000, 2000);
843 gpiod_set_value_cansleep(data->gpiod_rst, 1);
844 usleep_range(1000, 2000);
845 }
846
847 ret = regmap_write(data->regmap, SX9500_REG_IRQ_MSK, 0);
848 if (ret < 0)
849 return ret;
850
851 ret = regmap_write(data->regmap, SX9500_REG_RESET,
852 SX9500_SOFT_RESET);
853 if (ret < 0)
854 return ret;
855
856 ret = regmap_read(data->regmap, SX9500_REG_IRQ_SRC, &val);
857 if (ret < 0)
858 return ret;
859
860 for (i = 0; i < ARRAY_SIZE(sx9500_default_regs); i++) {
861 ret = regmap_write(data->regmap,
862 sx9500_default_regs[i].reg,
863 sx9500_default_regs[i].def);
864 if (ret < 0)
865 return ret;
866 }
867
868 return sx9500_init_compensation(indio_dev);
869 }
870
871 static void sx9500_gpio_probe(struct i2c_client *client,
872 struct sx9500_data *data)
873 {
874 struct device *dev;
875
876 if (!client)
877 return;
878
879 dev = &client->dev;
880
881 data->gpiod_rst = devm_gpiod_get(dev, SX9500_GPIO_RESET, GPIOD_OUT_HIGH);
882 if (IS_ERR(data->gpiod_rst)) {
883 dev_warn(dev, "gpio get reset pin failed\n");
884 data->gpiod_rst = NULL;
885 }
886 }
887
888 static int sx9500_probe(struct i2c_client *client,
889 const struct i2c_device_id *id)
890 {
891 int ret;
892 struct iio_dev *indio_dev;
893 struct sx9500_data *data;
894
895 indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data));
896 if (indio_dev == NULL)
897 return -ENOMEM;
898
899 data = iio_priv(indio_dev);
900 data->client = client;
901 mutex_init(&data->mutex);
902 init_completion(&data->completion);
903 data->trigger_enabled = false;
904
905 data->regmap = devm_regmap_init_i2c(client, &sx9500_regmap_config);
906 if (IS_ERR(data->regmap))
907 return PTR_ERR(data->regmap);
908
909 indio_dev->dev.parent = &client->dev;
910 indio_dev->name = SX9500_DRIVER_NAME;
911 indio_dev->channels = sx9500_channels;
912 indio_dev->num_channels = ARRAY_SIZE(sx9500_channels);
913 indio_dev->info = &sx9500_info;
914 indio_dev->modes = INDIO_DIRECT_MODE;
915 i2c_set_clientdata(client, indio_dev);
916
917 sx9500_gpio_probe(client, data);
918
919 ret = sx9500_init_device(indio_dev);
920 if (ret < 0)
921 return ret;
922
923 if (client->irq <= 0)
924 dev_warn(&client->dev, "no valid irq found\n");
925 else {
926 ret = devm_request_threaded_irq(&client->dev, client->irq,
927 sx9500_irq_handler, sx9500_irq_thread_handler,
928 IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
929 SX9500_IRQ_NAME, indio_dev);
930 if (ret < 0)
931 return ret;
932
933 data->trig = devm_iio_trigger_alloc(&client->dev,
934 "%s-dev%d", indio_dev->name, indio_dev->id);
935 if (!data->trig)
936 return -ENOMEM;
937
938 data->trig->dev.parent = &client->dev;
939 data->trig->ops = &sx9500_trigger_ops;
940 iio_trigger_set_drvdata(data->trig, indio_dev);
941
942 ret = iio_trigger_register(data->trig);
943 if (ret)
944 return ret;
945 }
946
947 ret = iio_triggered_buffer_setup(indio_dev, NULL,
948 sx9500_trigger_handler,
949 &sx9500_buffer_setup_ops);
950 if (ret < 0)
951 goto out_trigger_unregister;
952
953 ret = iio_device_register(indio_dev);
954 if (ret < 0)
955 goto out_buffer_cleanup;
956
957 return 0;
958
959 out_buffer_cleanup:
960 iio_triggered_buffer_cleanup(indio_dev);
961 out_trigger_unregister:
962 if (client->irq > 0)
963 iio_trigger_unregister(data->trig);
964
965 return ret;
966 }
967
968 static int sx9500_remove(struct i2c_client *client)
969 {
970 struct iio_dev *indio_dev = i2c_get_clientdata(client);
971 struct sx9500_data *data = iio_priv(indio_dev);
972
973 iio_device_unregister(indio_dev);
974 iio_triggered_buffer_cleanup(indio_dev);
975 if (client->irq > 0)
976 iio_trigger_unregister(data->trig);
977 kfree(data->buffer);
978
979 return 0;
980 }
981
982 #ifdef CONFIG_PM_SLEEP
983 static int sx9500_suspend(struct device *dev)
984 {
985 struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
986 struct sx9500_data *data = iio_priv(indio_dev);
987 int ret;
988
989 mutex_lock(&data->mutex);
990 ret = regmap_read(data->regmap, SX9500_REG_PROX_CTRL0,
991 &data->suspend_ctrl0);
992 if (ret < 0)
993 goto out;
994
995 /*
996 * Scan period doesn't matter because when all the sensors are
997 * deactivated the device is in sleep mode.
998 */
999 ret = regmap_write(data->regmap, SX9500_REG_PROX_CTRL0, 0);
1000
1001 out:
1002 mutex_unlock(&data->mutex);
1003 return ret;
1004 }
1005
1006 static int sx9500_resume(struct device *dev)
1007 {
1008 struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
1009 struct sx9500_data *data = iio_priv(indio_dev);
1010 int ret;
1011
1012 mutex_lock(&data->mutex);
1013 ret = regmap_write(data->regmap, SX9500_REG_PROX_CTRL0,
1014 data->suspend_ctrl0);
1015 mutex_unlock(&data->mutex);
1016
1017 return ret;
1018 }
1019 #endif /* CONFIG_PM_SLEEP */
1020
1021 static const struct dev_pm_ops sx9500_pm_ops = {
1022 SET_SYSTEM_SLEEP_PM_OPS(sx9500_suspend, sx9500_resume)
1023 };
1024
1025 static const struct acpi_device_id sx9500_acpi_match[] = {
1026 {"SSX9500", 0},
1027 { },
1028 };
1029 MODULE_DEVICE_TABLE(acpi, sx9500_acpi_match);
1030
1031 static const struct of_device_id sx9500_of_match[] = {
1032 { .compatible = "semtech,sx9500", },
1033 { }
1034 };
1035 MODULE_DEVICE_TABLE(of, sx9500_of_match);
1036
1037 static const struct i2c_device_id sx9500_id[] = {
1038 {"sx9500", 0},
1039 { },
1040 };
1041 MODULE_DEVICE_TABLE(i2c, sx9500_id);
1042
1043 static struct i2c_driver sx9500_driver = {
1044 .driver = {
1045 .name = SX9500_DRIVER_NAME,
1046 .acpi_match_table = ACPI_PTR(sx9500_acpi_match),
1047 .of_match_table = of_match_ptr(sx9500_of_match),
1048 .pm = &sx9500_pm_ops,
1049 },
1050 .probe = sx9500_probe,
1051 .remove = sx9500_remove,
1052 .id_table = sx9500_id,
1053 };
1054 module_i2c_driver(sx9500_driver);
1055
1056 MODULE_AUTHOR("Vlad Dogaru <vlad.dogaru@intel.com>");
1057 MODULE_DESCRIPTION("Driver for Semtech SX9500 proximity sensor");
1058 MODULE_LICENSE("GPL v2");
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