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sh_eth: fix EESIPR values for SH77{34|63}
[linux/fpc-iii.git] / drivers / iio / proximity / sx9500.c
blob1f06282ec793a07f66f7f34c187c302f5872577d
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
391 switch (chan->type) {
392 case IIO_PROXIMITY:
393 switch (mask) {
394 case IIO_CHAN_INFO_RAW:
395 if (iio_buffer_enabled(indio_dev))
396 return -EBUSY;
397 return sx9500_read_proximity(data, chan, val);
398 case IIO_CHAN_INFO_SAMP_FREQ:
399 return sx9500_read_samp_freq(data, val, val2);
400 default:
401 return -EINVAL;
402 }
403 default:
404 return -EINVAL;
405 }
406 }
407
408 static int sx9500_set_samp_freq(struct sx9500_data *data,
409 int val, int val2)
410 {
411 int i, ret;
412
413 for (i = 0; i < ARRAY_SIZE(sx9500_samp_freq_table); i++)
414 if (val == sx9500_samp_freq_table[i].val &&
415 val2 == sx9500_samp_freq_table[i].val2)
416 break;
417
418 if (i == ARRAY_SIZE(sx9500_samp_freq_table))
419 return -EINVAL;
420
421 mutex_lock(&data->mutex);
422
423 ret = regmap_update_bits(data->regmap, SX9500_REG_PROX_CTRL0,
424 SX9500_SCAN_PERIOD_MASK,
425 i << SX9500_SCAN_PERIOD_SHIFT);
426
427 mutex_unlock(&data->mutex);
428
429 return ret;
430 }
431
432 static int sx9500_write_raw(struct iio_dev *indio_dev,
433 const struct iio_chan_spec *chan,
434 int val, int val2, long mask)
435 {
436 struct sx9500_data *data = iio_priv(indio_dev);
437
438 switch (chan->type) {
439 case IIO_PROXIMITY:
440 switch (mask) {
441 case IIO_CHAN_INFO_SAMP_FREQ:
442 return sx9500_set_samp_freq(data, val, val2);
443 default:
444 return -EINVAL;
445 }
446 default:
447 return -EINVAL;
448 }
449 }
450
451 static irqreturn_t sx9500_irq_handler(int irq, void *private)
452 {
453 struct iio_dev *indio_dev = private;
454 struct sx9500_data *data = iio_priv(indio_dev);
455
456 if (data->trigger_enabled)
457 iio_trigger_poll(data->trig);
458
459 /*
460 * Even if no event is enabled, we need to wake the thread to
461 * clear the interrupt state by reading SX9500_REG_IRQ_SRC. It
462 * is not possible to do that here because regmap_read takes a
463 * mutex.
464 */
465 return IRQ_WAKE_THREAD;
466 }
467
468 static void sx9500_push_events(struct iio_dev *indio_dev)
469 {
470 int ret;
471 unsigned int val, chan;
472 struct sx9500_data *data = iio_priv(indio_dev);
473
474 ret = regmap_read(data->regmap, SX9500_REG_STAT, &val);
475 if (ret < 0) {
476 dev_err(&data->client->dev, "i2c transfer error in irq\n");
477 return;
478 }
479
480 val >>= SX9500_PROXSTAT_SHIFT;
481 for (chan = 0; chan < SX9500_NUM_CHANNELS; chan++) {
482 int dir;
483 u64 ev;
484 bool new_prox = val & BIT(chan);
485
486 if (!data->event_enabled[chan])
487 continue;
488 if (new_prox == data->prox_stat[chan])
489 /* No change on this channel. */
490 continue;
491
492 dir = new_prox ? IIO_EV_DIR_FALLING : IIO_EV_DIR_RISING;
493 ev = IIO_UNMOD_EVENT_CODE(IIO_PROXIMITY, chan,
494 IIO_EV_TYPE_THRESH, dir);
495 iio_push_event(indio_dev, ev, iio_get_time_ns(indio_dev));
496 data->prox_stat[chan] = new_prox;
497 }
498 }
499
500 static irqreturn_t sx9500_irq_thread_handler(int irq, void *private)
501 {
502 struct iio_dev *indio_dev = private;
503 struct sx9500_data *data = iio_priv(indio_dev);
504 int ret;
505 unsigned int val;
506
507 mutex_lock(&data->mutex);
508
509 ret = regmap_read(data->regmap, SX9500_REG_IRQ_SRC, &val);
510 if (ret < 0) {
511 dev_err(&data->client->dev, "i2c transfer error in irq\n");
512 goto out;
513 }
514
515 if (val & (SX9500_CLOSE_IRQ | SX9500_FAR_IRQ))
516 sx9500_push_events(indio_dev);
517
518 if (val & SX9500_CONVDONE_IRQ)
519 complete(&data->completion);
520
521 out:
522 mutex_unlock(&data->mutex);
523
524 return IRQ_HANDLED;
525 }
526
527 static int sx9500_read_event_config(struct iio_dev *indio_dev,
528 const struct iio_chan_spec *chan,
529 enum iio_event_type type,
530 enum iio_event_direction dir)
531 {
532 struct sx9500_data *data = iio_priv(indio_dev);
533
534 if (chan->type != IIO_PROXIMITY || type != IIO_EV_TYPE_THRESH ||
535 dir != IIO_EV_DIR_EITHER)
536 return -EINVAL;
537
538 return data->event_enabled[chan->channel];
539 }
540
541 static int sx9500_write_event_config(struct iio_dev *indio_dev,
542 const struct iio_chan_spec *chan,
543 enum iio_event_type type,
544 enum iio_event_direction dir,
545 int state)
546 {
547 struct sx9500_data *data = iio_priv(indio_dev);
548 int ret;
549
550 if (chan->type != IIO_PROXIMITY || type != IIO_EV_TYPE_THRESH ||
551 dir != IIO_EV_DIR_EITHER)
552 return -EINVAL;
553
554 mutex_lock(&data->mutex);
555
556 if (state == 1) {
557 ret = sx9500_inc_chan_users(data, chan->channel);
558 if (ret < 0)
559 goto out_unlock;
560 ret = sx9500_inc_close_far_users(data);
561 if (ret < 0)
562 goto out_undo_chan;
563 } else {
564 ret = sx9500_dec_chan_users(data, chan->channel);
565 if (ret < 0)
566 goto out_unlock;
567 ret = sx9500_dec_close_far_users(data);
568 if (ret < 0)
569 goto out_undo_chan;
570 }
571
572 data->event_enabled[chan->channel] = state;
573 goto out_unlock;
574
575 out_undo_chan:
576 if (state == 1)
577 sx9500_dec_chan_users(data, chan->channel);
578 else
579 sx9500_inc_chan_users(data, chan->channel);
580 out_unlock:
581 mutex_unlock(&data->mutex);
582 return ret;
583 }
584
585 static int sx9500_update_scan_mode(struct iio_dev *indio_dev,
586 const unsigned long *scan_mask)
587 {
588 struct sx9500_data *data = iio_priv(indio_dev);
589
590 mutex_lock(&data->mutex);
591 kfree(data->buffer);
592 data->buffer = kzalloc(indio_dev->scan_bytes, GFP_KERNEL);
593 mutex_unlock(&data->mutex);
594
595 if (data->buffer == NULL)
596 return -ENOMEM;
597
598 return 0;
599 }
600
601 static IIO_CONST_ATTR_SAMP_FREQ_AVAIL(
602 "2.500000 3.333333 5 6.666666 8.333333 11.111111 16.666666 33.333333");
603
604 static struct attribute *sx9500_attributes[] = {
605 &iio_const_attr_sampling_frequency_available.dev_attr.attr,
606 NULL,
607 };
608
609 static const struct attribute_group sx9500_attribute_group = {
610 .attrs = sx9500_attributes,
611 };
612
613 static const struct iio_info sx9500_info = {
614 .driver_module = THIS_MODULE,
615 .attrs = &sx9500_attribute_group,
616 .read_raw = &sx9500_read_raw,
617 .write_raw = &sx9500_write_raw,
618 .read_event_config = &sx9500_read_event_config,
619 .write_event_config = &sx9500_write_event_config,
620 .update_scan_mode = &sx9500_update_scan_mode,
621 };
622
623 static int sx9500_set_trigger_state(struct iio_trigger *trig,
624 bool state)
625 {
626 struct iio_dev *indio_dev = iio_trigger_get_drvdata(trig);
627 struct sx9500_data *data = iio_priv(indio_dev);
628 int ret;
629
630 mutex_lock(&data->mutex);
631
632 if (state)
633 ret = sx9500_inc_data_rdy_users(data);
634 else
635 ret = sx9500_dec_data_rdy_users(data);
636 if (ret < 0)
637 goto out;
638
639 data->trigger_enabled = state;
640
641 out:
642 mutex_unlock(&data->mutex);
643
644 return ret;
645 }
646
647 static const struct iio_trigger_ops sx9500_trigger_ops = {
648 .set_trigger_state = sx9500_set_trigger_state,
649 .owner = THIS_MODULE,
650 };
651
652 static irqreturn_t sx9500_trigger_handler(int irq, void *private)
653 {
654 struct iio_poll_func *pf = private;
655 struct iio_dev *indio_dev = pf->indio_dev;
656 struct sx9500_data *data = iio_priv(indio_dev);
657 int val, bit, ret, i = 0;
658
659 mutex_lock(&data->mutex);
660
661 for_each_set_bit(bit, indio_dev->active_scan_mask,
662 indio_dev->masklength) {
663 ret = sx9500_read_prox_data(data, &indio_dev->channels[bit],
664 &val);
665 if (ret < 0)
666 goto out;
667
668 data->buffer[i++] = val;
669 }
670
671 iio_push_to_buffers_with_timestamp(indio_dev, data->buffer,
672 iio_get_time_ns(indio_dev));
673
674 out:
675 mutex_unlock(&data->mutex);
676
677 iio_trigger_notify_done(indio_dev->trig);
678
679 return IRQ_HANDLED;
680 }
681
682 static int sx9500_buffer_preenable(struct iio_dev *indio_dev)
683 {
684 struct sx9500_data *data = iio_priv(indio_dev);
685 int ret = 0, i;
686
687 mutex_lock(&data->mutex);
688
689 for (i = 0; i < SX9500_NUM_CHANNELS; i++)
690 if (test_bit(i, indio_dev->active_scan_mask)) {
691 ret = sx9500_inc_chan_users(data, i);
692 if (ret)
693 break;
694 }
695
696 if (ret)
697 for (i = i - 1; i >= 0; i--)
698 if (test_bit(i, indio_dev->active_scan_mask))
699 sx9500_dec_chan_users(data, i);
700
701 mutex_unlock(&data->mutex);
702
703 return ret;
704 }
705
706 static int sx9500_buffer_predisable(struct iio_dev *indio_dev)
707 {
708 struct sx9500_data *data = iio_priv(indio_dev);
709 int ret = 0, i;
710
711 iio_triggered_buffer_predisable(indio_dev);
712
713 mutex_lock(&data->mutex);
714
715 for (i = 0; i < SX9500_NUM_CHANNELS; i++)
716 if (test_bit(i, indio_dev->active_scan_mask)) {
717 ret = sx9500_dec_chan_users(data, i);
718 if (ret)
719 break;
720 }
721
722 if (ret)
723 for (i = i - 1; i >= 0; i--)
724 if (test_bit(i, indio_dev->active_scan_mask))
725 sx9500_inc_chan_users(data, i);
726
727 mutex_unlock(&data->mutex);
728
729 return ret;
730 }
731
732 static const struct iio_buffer_setup_ops sx9500_buffer_setup_ops = {
733 .preenable = sx9500_buffer_preenable,
734 .postenable = iio_triggered_buffer_postenable,
735 .predisable = sx9500_buffer_predisable,
736 };
737
738 struct sx9500_reg_default {
739 u8 reg;
740 u8 def;
741 };
742
743 static const struct sx9500_reg_default sx9500_default_regs[] = {
744 {
745 .reg = SX9500_REG_PROX_CTRL1,
746 /* Shield enabled, small range. */
747 .def = 0x43,
748 },
749 {
750 .reg = SX9500_REG_PROX_CTRL2,
751 /* x8 gain, 167kHz frequency, finest resolution. */
752 .def = 0x77,
753 },
754 {
755 .reg = SX9500_REG_PROX_CTRL3,
756 /* Doze enabled, 2x scan period doze, no raw filter. */
757 .def = 0x40,
758 },
759 {
760 .reg = SX9500_REG_PROX_CTRL4,
761 /* Average threshold. */
762 .def = 0x30,
763 },
764 {
765 .reg = SX9500_REG_PROX_CTRL5,
766 /*
767 * Debouncer off, lowest average negative filter,
768 * highest average postive filter.
769 */
770 .def = 0x0f,
771 },
772 {
773 .reg = SX9500_REG_PROX_CTRL6,
774 /* Proximity detection threshold: 280 */
775 .def = 0x0e,
776 },
777 {
778 .reg = SX9500_REG_PROX_CTRL7,
779 /*
780 * No automatic compensation, compensate each pin
781 * independently, proximity hysteresis: 32, close
782 * debouncer off, far debouncer off.
783 */
784 .def = 0x00,
785 },
786 {
787 .reg = SX9500_REG_PROX_CTRL8,
788 /* No stuck timeout, no periodic compensation. */
789 .def = 0x00,
790 },
791 {
792 .reg = SX9500_REG_PROX_CTRL0,
793 /* Scan period: 30ms, all sensors disabled. */
794 .def = 0x00,
795 },
796 };
797
798 /* Activate all channels and perform an initial compensation. */
799 static int sx9500_init_compensation(struct iio_dev *indio_dev)
800 {
801 struct sx9500_data *data = iio_priv(indio_dev);
802 int i, ret;
803 unsigned int val;
804
805 ret = regmap_update_bits(data->regmap, SX9500_REG_PROX_CTRL0,
806 SX9500_CHAN_MASK, SX9500_CHAN_MASK);
807 if (ret < 0)
808 return ret;
809
810 for (i = 10; i >= 0; i--) {
811 usleep_range(10000, 20000);
812 ret = regmap_read(data->regmap, SX9500_REG_STAT, &val);
813 if (ret < 0)
814 goto out;
815 if (!(val & SX9500_COMPSTAT_MASK))
816 break;
817 }
818
819 if (i < 0) {
820 dev_err(&data->client->dev, "initial compensation timed out");
821 ret = -ETIMEDOUT;
822 }
823
824 out:
825 regmap_update_bits(data->regmap, SX9500_REG_PROX_CTRL0,
826 SX9500_CHAN_MASK, 0);
827 return ret;
828 }
829
830 static int sx9500_init_device(struct iio_dev *indio_dev)
831 {
832 struct sx9500_data *data = iio_priv(indio_dev);
833 int ret, i;
834 unsigned int val;
835
836 if (data->gpiod_rst) {
837 gpiod_set_value_cansleep(data->gpiod_rst, 0);
838 usleep_range(1000, 2000);
839 gpiod_set_value_cansleep(data->gpiod_rst, 1);
840 usleep_range(1000, 2000);
841 }
842
843 ret = regmap_write(data->regmap, SX9500_REG_IRQ_MSK, 0);
844 if (ret < 0)
845 return ret;
846
847 ret = regmap_write(data->regmap, SX9500_REG_RESET,
848 SX9500_SOFT_RESET);
849 if (ret < 0)
850 return ret;
851
852 ret = regmap_read(data->regmap, SX9500_REG_IRQ_SRC, &val);
853 if (ret < 0)
854 return ret;
855
856 for (i = 0; i < ARRAY_SIZE(sx9500_default_regs); i++) {
857 ret = regmap_write(data->regmap,
858 sx9500_default_regs[i].reg,
859 sx9500_default_regs[i].def);
860 if (ret < 0)
861 return ret;
862 }
863
864 return sx9500_init_compensation(indio_dev);
865 }
866
867 static void sx9500_gpio_probe(struct i2c_client *client,
868 struct sx9500_data *data)
869 {
870 struct device *dev;
871
872 if (!client)
873 return;
874
875 dev = &client->dev;
876
877 data->gpiod_rst = devm_gpiod_get_index(dev, SX9500_GPIO_RESET,
878 0, GPIOD_OUT_HIGH);
879 if (IS_ERR(data->gpiod_rst)) {
880 dev_warn(dev, "gpio get reset pin failed\n");
881 data->gpiod_rst = NULL;
882 }
883 }
884
885 static int sx9500_probe(struct i2c_client *client,
886 const struct i2c_device_id *id)
887 {
888 int ret;
889 struct iio_dev *indio_dev;
890 struct sx9500_data *data;
891
892 indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data));
893 if (indio_dev == NULL)
894 return -ENOMEM;
895
896 data = iio_priv(indio_dev);
897 data->client = client;
898 mutex_init(&data->mutex);
899 init_completion(&data->completion);
900 data->trigger_enabled = false;
901
902 data->regmap = devm_regmap_init_i2c(client, &sx9500_regmap_config);
903 if (IS_ERR(data->regmap))
904 return PTR_ERR(data->regmap);
905
906 indio_dev->dev.parent = &client->dev;
907 indio_dev->name = SX9500_DRIVER_NAME;
908 indio_dev->channels = sx9500_channels;
909 indio_dev->num_channels = ARRAY_SIZE(sx9500_channels);
910 indio_dev->info = &sx9500_info;
911 indio_dev->modes = INDIO_DIRECT_MODE;
912 i2c_set_clientdata(client, indio_dev);
913
914 sx9500_gpio_probe(client, data);
915
916 ret = sx9500_init_device(indio_dev);
917 if (ret < 0)
918 return ret;
919
920 if (client->irq <= 0)
921 dev_warn(&client->dev, "no valid irq found\n");
922 else {
923 ret = devm_request_threaded_irq(&client->dev, client->irq,
924 sx9500_irq_handler, sx9500_irq_thread_handler,
925 IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
926 SX9500_IRQ_NAME, indio_dev);
927 if (ret < 0)
928 return ret;
929
930 data->trig = devm_iio_trigger_alloc(&client->dev,
931 "%s-dev%d", indio_dev->name, indio_dev->id);
932 if (!data->trig)
933 return -ENOMEM;
934
935 data->trig->dev.parent = &client->dev;
936 data->trig->ops = &sx9500_trigger_ops;
937 iio_trigger_set_drvdata(data->trig, indio_dev);
938
939 ret = iio_trigger_register(data->trig);
940 if (ret)
941 return ret;
942 }
943
944 ret = iio_triggered_buffer_setup(indio_dev, NULL,
945 sx9500_trigger_handler,
946 &sx9500_buffer_setup_ops);
947 if (ret < 0)
948 goto out_trigger_unregister;
949
950 ret = iio_device_register(indio_dev);
951 if (ret < 0)
952 goto out_buffer_cleanup;
953
954 return 0;
955
956 out_buffer_cleanup:
957 iio_triggered_buffer_cleanup(indio_dev);
958 out_trigger_unregister:
959 if (client->irq > 0)
960 iio_trigger_unregister(data->trig);
961
962 return ret;
963 }
964
965 static int sx9500_remove(struct i2c_client *client)
966 {
967 struct iio_dev *indio_dev = i2c_get_clientdata(client);
968 struct sx9500_data *data = iio_priv(indio_dev);
969
970 iio_device_unregister(indio_dev);
971 iio_triggered_buffer_cleanup(indio_dev);
972 if (client->irq > 0)
973 iio_trigger_unregister(data->trig);
974 kfree(data->buffer);
975
976 return 0;
977 }
978
979 #ifdef CONFIG_PM_SLEEP
980 static int sx9500_suspend(struct device *dev)
981 {
982 struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
983 struct sx9500_data *data = iio_priv(indio_dev);
984 int ret;
985
986 mutex_lock(&data->mutex);
987 ret = regmap_read(data->regmap, SX9500_REG_PROX_CTRL0,
988 &data->suspend_ctrl0);
989 if (ret < 0)
990 goto out;
991
992 /*
993 * Scan period doesn't matter because when all the sensors are
994 * deactivated the device is in sleep mode.
995 */
996 ret = regmap_write(data->regmap, SX9500_REG_PROX_CTRL0, 0);
997
998 out:
999 mutex_unlock(&data->mutex);
1000 return ret;
1001 }
1002
1003 static int sx9500_resume(struct device *dev)
1004 {
1005 struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
1006 struct sx9500_data *data = iio_priv(indio_dev);
1007 int ret;
1008
1009 mutex_lock(&data->mutex);
1010 ret = regmap_write(data->regmap, SX9500_REG_PROX_CTRL0,
1011 data->suspend_ctrl0);
1012 mutex_unlock(&data->mutex);
1013
1014 return ret;
1015 }
1016 #endif /* CONFIG_PM_SLEEP */
1017
1018 static const struct dev_pm_ops sx9500_pm_ops = {
1019 SET_SYSTEM_SLEEP_PM_OPS(sx9500_suspend, sx9500_resume)
1020 };
1021
1022 static const struct acpi_device_id sx9500_acpi_match[] = {
1023 {"SSX9500", 0},
1024 { },
1025 };
1026 MODULE_DEVICE_TABLE(acpi, sx9500_acpi_match);
1027
1028 static const struct of_device_id sx9500_of_match[] = {
1029 { .compatible = "semtech,sx9500", },
1030 { }
1031 };
1032 MODULE_DEVICE_TABLE(of, sx9500_of_match);
1033
1034 static const struct i2c_device_id sx9500_id[] = {
1035 {"sx9500", 0},
1036 { },
1037 };
1038 MODULE_DEVICE_TABLE(i2c, sx9500_id);
1039
1040 static struct i2c_driver sx9500_driver = {
1041 .driver = {
1042 .name = SX9500_DRIVER_NAME,
1043 .acpi_match_table = ACPI_PTR(sx9500_acpi_match),
1044 .of_match_table = of_match_ptr(sx9500_of_match),
1045 .pm = &sx9500_pm_ops,
1046 },
1047 .probe = sx9500_probe,
1048 .remove = sx9500_remove,
1049 .id_table = sx9500_id,
1050 };
1051 module_i2c_driver(sx9500_driver);
1052
1053 MODULE_AUTHOR("Vlad Dogaru <vlad.dogaru@intel.com>");
1054 MODULE_DESCRIPTION("Driver for Semtech SX9500 proximity sensor");
1055 MODULE_LICENSE("GPL v2");
Linux with added FPC-III support