1// SPDX-License-Identifier: GPL-2.0
2/*
3 * AD7606 SPI ADC driver
4 *
5 * Copyright 2011 Analog Devices Inc.
6 */
7
8#include <linux/delay.h>
9#include <linux/device.h>
10#include <linux/err.h>
11#include <linux/gpio/consumer.h>
12#include <linux/interrupt.h>
13#include <linux/kernel.h>
14#include <linux/module.h>
15#include <linux/property.h>
16#include <linux/regulator/consumer.h>
17#include <linux/sched.h>
18#include <linux/slab.h>
19#include <linux/sysfs.h>
20#include <linux/util_macros.h>
21
22#include <linux/iio/iio.h>
23#include <linux/iio/buffer.h>
24#include <linux/iio/sysfs.h>
25#include <linux/iio/trigger.h>
26#include <linux/iio/triggered_buffer.h>
27#include <linux/iio/trigger_consumer.h>
28
29#include "ad7606.h"
30
31/*
32 * Scales are computed as 5000/32768 and 10000/32768 respectively,
33 * so that when applied to the raw values they provide mV values
34 */
35static const unsigned int ad7606_scale_avail[2] = {
36 152588, 305176
37};
38
39
40static const unsigned int ad7616_sw_scale_avail[3] = {
41 76293, 152588, 305176
42};
43
44static const unsigned int ad7606_oversampling_avail[7] = {
45 1, 2, 4, 8, 16, 32, 64,
46};
47
48static const unsigned int ad7616_oversampling_avail[8] = {
49 1, 2, 4, 8, 16, 32, 64, 128,
50};
51
52static int ad7606_reset(struct ad7606_state *st)
53{
54 if (st->gpio_reset) {
55 gpiod_set_value(desc: st->gpio_reset, value: 1);
56 ndelay(100); /* t_reset >= 100ns */
57 gpiod_set_value(desc: st->gpio_reset, value: 0);
58 return 0;
59 }
60
61 return -ENODEV;
62}
63
64static int ad7606_reg_access(struct iio_dev *indio_dev,
65 unsigned int reg,
66 unsigned int writeval,
67 unsigned int *readval)
68{
69 struct ad7606_state *st = iio_priv(indio_dev);
70 int ret;
71
72 mutex_lock(&st->lock);
73 if (readval) {
74 ret = st->bops->reg_read(st, reg);
75 if (ret < 0)
76 goto err_unlock;
77 *readval = ret;
78 ret = 0;
79 } else {
80 ret = st->bops->reg_write(st, reg, writeval);
81 }
82err_unlock:
83 mutex_unlock(lock: &st->lock);
84 return ret;
85}
86
87static int ad7606_read_samples(struct ad7606_state *st)
88{
89 unsigned int num = st->chip_info->num_channels - 1;
90 u16 *data = st->data;
91 int ret;
92
93 /*
94 * The frstdata signal is set to high while and after reading the sample
95 * of the first channel and low for all other channels. This can be used
96 * to check that the incoming data is correctly aligned. During normal
97 * operation the data should never become unaligned, but some glitch or
98 * electrostatic discharge might cause an extra read or clock cycle.
99 * Monitoring the frstdata signal allows to recover from such failure
100 * situations.
101 */
102
103 if (st->gpio_frstdata) {
104 ret = st->bops->read_block(st->dev, 1, data);
105 if (ret)
106 return ret;
107
108 if (!gpiod_get_value(desc: st->gpio_frstdata)) {
109 ad7606_reset(st);
110 return -EIO;
111 }
112
113 data++;
114 num--;
115 }
116
117 return st->bops->read_block(st->dev, num, data);
118}
119
120static irqreturn_t ad7606_trigger_handler(int irq, void *p)
121{
122 struct iio_poll_func *pf = p;
123 struct iio_dev *indio_dev = pf->indio_dev;
124 struct ad7606_state *st = iio_priv(indio_dev);
125 int ret;
126
127 mutex_lock(&st->lock);
128
129 ret = ad7606_read_samples(st);
130 if (ret == 0)
131 iio_push_to_buffers_with_timestamp(indio_dev, data: st->data,
132 timestamp: iio_get_time_ns(indio_dev));
133
134 iio_trigger_notify_done(trig: indio_dev->trig);
135 /* The rising edge of the CONVST signal starts a new conversion. */
136 gpiod_set_value(desc: st->gpio_convst, value: 1);
137
138 mutex_unlock(lock: &st->lock);
139
140 return IRQ_HANDLED;
141}
142
143static int ad7606_scan_direct(struct iio_dev *indio_dev, unsigned int ch)
144{
145 struct ad7606_state *st = iio_priv(indio_dev);
146 int ret;
147
148 gpiod_set_value(desc: st->gpio_convst, value: 1);
149 ret = wait_for_completion_timeout(x: &st->completion,
150 timeout: msecs_to_jiffies(m: 1000));
151 if (!ret) {
152 ret = -ETIMEDOUT;
153 goto error_ret;
154 }
155
156 ret = ad7606_read_samples(st);
157 if (ret == 0)
158 ret = st->data[ch];
159
160error_ret:
161 gpiod_set_value(desc: st->gpio_convst, value: 0);
162
163 return ret;
164}
165
166static int ad7606_read_raw(struct iio_dev *indio_dev,
167 struct iio_chan_spec const *chan,
168 int *val,
169 int *val2,
170 long m)
171{
172 int ret, ch = 0;
173 struct ad7606_state *st = iio_priv(indio_dev);
174
175 switch (m) {
176 case IIO_CHAN_INFO_RAW:
177 ret = iio_device_claim_direct_mode(indio_dev);
178 if (ret)
179 return ret;
180
181 ret = ad7606_scan_direct(indio_dev, ch: chan->address);
182 iio_device_release_direct_mode(indio_dev);
183
184 if (ret < 0)
185 return ret;
186 *val = (short)ret;
187 return IIO_VAL_INT;
188 case IIO_CHAN_INFO_SCALE:
189 if (st->sw_mode_en)
190 ch = chan->address;
191 *val = 0;
192 *val2 = st->scale_avail[st->range[ch]];
193 return IIO_VAL_INT_PLUS_MICRO;
194 case IIO_CHAN_INFO_OVERSAMPLING_RATIO:
195 *val = st->oversampling;
196 return IIO_VAL_INT;
197 }
198 return -EINVAL;
199}
200
201static ssize_t ad7606_show_avail(char *buf, const unsigned int *vals,
202 unsigned int n, bool micros)
203{
204 size_t len = 0;
205 int i;
206
207 for (i = 0; i < n; i++) {
208 len += scnprintf(buf: buf + len, PAGE_SIZE - len,
209 fmt: micros ? "0.%06u " : "%u ", vals[i]);
210 }
211 buf[len - 1] = '\n';
212
213 return len;
214}
215
216static ssize_t in_voltage_scale_available_show(struct device *dev,
217 struct device_attribute *attr,
218 char *buf)
219{
220 struct iio_dev *indio_dev = dev_to_iio_dev(dev);
221 struct ad7606_state *st = iio_priv(indio_dev);
222
223 return ad7606_show_avail(buf, vals: st->scale_avail, n: st->num_scales, micros: true);
224}
225
226static IIO_DEVICE_ATTR_RO(in_voltage_scale_available, 0);
227
228static int ad7606_write_scale_hw(struct iio_dev *indio_dev, int ch, int val)
229{
230 struct ad7606_state *st = iio_priv(indio_dev);
231
232 gpiod_set_value(desc: st->gpio_range, value: val);
233
234 return 0;
235}
236
237static int ad7606_write_os_hw(struct iio_dev *indio_dev, int val)
238{
239 struct ad7606_state *st = iio_priv(indio_dev);
240 DECLARE_BITMAP(values, 3);
241
242 values[0] = val;
243
244 gpiod_set_array_value(ARRAY_SIZE(values), desc_array: st->gpio_os->desc,
245 array_info: st->gpio_os->info, value_bitmap: values);
246
247 /* AD7616 requires a reset to update value */
248 if (st->chip_info->os_req_reset)
249 ad7606_reset(st);
250
251 return 0;
252}
253
254static int ad7606_write_raw(struct iio_dev *indio_dev,
255 struct iio_chan_spec const *chan,
256 int val,
257 int val2,
258 long mask)
259{
260 struct ad7606_state *st = iio_priv(indio_dev);
261 int i, ret, ch = 0;
262
263 switch (mask) {
264 case IIO_CHAN_INFO_SCALE:
265 mutex_lock(&st->lock);
266 i = find_closest(val2, st->scale_avail, st->num_scales);
267 if (st->sw_mode_en)
268 ch = chan->address;
269 ret = st->write_scale(indio_dev, ch, i);
270 if (ret < 0) {
271 mutex_unlock(lock: &st->lock);
272 return ret;
273 }
274 st->range[ch] = i;
275 mutex_unlock(lock: &st->lock);
276
277 return 0;
278 case IIO_CHAN_INFO_OVERSAMPLING_RATIO:
279 if (val2)
280 return -EINVAL;
281 i = find_closest(val, st->oversampling_avail,
282 st->num_os_ratios);
283 mutex_lock(&st->lock);
284 ret = st->write_os(indio_dev, i);
285 if (ret < 0) {
286 mutex_unlock(lock: &st->lock);
287 return ret;
288 }
289 st->oversampling = st->oversampling_avail[i];
290 mutex_unlock(lock: &st->lock);
291
292 return 0;
293 default:
294 return -EINVAL;
295 }
296}
297
298static ssize_t ad7606_oversampling_ratio_avail(struct device *dev,
299 struct device_attribute *attr,
300 char *buf)
301{
302 struct iio_dev *indio_dev = dev_to_iio_dev(dev);
303 struct ad7606_state *st = iio_priv(indio_dev);
304
305 return ad7606_show_avail(buf, vals: st->oversampling_avail,
306 n: st->num_os_ratios, micros: false);
307}
308
309static IIO_DEVICE_ATTR(oversampling_ratio_available, 0444,
310 ad7606_oversampling_ratio_avail, NULL, 0);
311
312static struct attribute *ad7606_attributes_os_and_range[] = {
313 &iio_dev_attr_in_voltage_scale_available.dev_attr.attr,
314 &iio_dev_attr_oversampling_ratio_available.dev_attr.attr,
315 NULL,
316};
317
318static const struct attribute_group ad7606_attribute_group_os_and_range = {
319 .attrs = ad7606_attributes_os_and_range,
320};
321
322static struct attribute *ad7606_attributes_os[] = {
323 &iio_dev_attr_oversampling_ratio_available.dev_attr.attr,
324 NULL,
325};
326
327static const struct attribute_group ad7606_attribute_group_os = {
328 .attrs = ad7606_attributes_os,
329};
330
331static struct attribute *ad7606_attributes_range[] = {
332 &iio_dev_attr_in_voltage_scale_available.dev_attr.attr,
333 NULL,
334};
335
336static const struct attribute_group ad7606_attribute_group_range = {
337 .attrs = ad7606_attributes_range,
338};
339
340static const struct iio_chan_spec ad7605_channels[] = {
341 IIO_CHAN_SOFT_TIMESTAMP(4),
342 AD7605_CHANNEL(0),
343 AD7605_CHANNEL(1),
344 AD7605_CHANNEL(2),
345 AD7605_CHANNEL(3),
346};
347
348static const struct iio_chan_spec ad7606_channels[] = {
349 IIO_CHAN_SOFT_TIMESTAMP(8),
350 AD7606_CHANNEL(0),
351 AD7606_CHANNEL(1),
352 AD7606_CHANNEL(2),
353 AD7606_CHANNEL(3),
354 AD7606_CHANNEL(4),
355 AD7606_CHANNEL(5),
356 AD7606_CHANNEL(6),
357 AD7606_CHANNEL(7),
358};
359
360/*
361 * The current assumption that this driver makes for AD7616, is that it's
362 * working in Hardware Mode with Serial, Burst and Sequencer modes activated.
363 * To activate them, following pins must be pulled high:
364 * -SER/PAR
365 * -SEQEN
366 * And following pins must be pulled low:
367 * -WR/BURST
368 * -DB4/SER1W
369 */
370static const struct iio_chan_spec ad7616_channels[] = {
371 IIO_CHAN_SOFT_TIMESTAMP(16),
372 AD7606_CHANNEL(0),
373 AD7606_CHANNEL(1),
374 AD7606_CHANNEL(2),
375 AD7606_CHANNEL(3),
376 AD7606_CHANNEL(4),
377 AD7606_CHANNEL(5),
378 AD7606_CHANNEL(6),
379 AD7606_CHANNEL(7),
380 AD7606_CHANNEL(8),
381 AD7606_CHANNEL(9),
382 AD7606_CHANNEL(10),
383 AD7606_CHANNEL(11),
384 AD7606_CHANNEL(12),
385 AD7606_CHANNEL(13),
386 AD7606_CHANNEL(14),
387 AD7606_CHANNEL(15),
388};
389
390static const struct ad7606_chip_info ad7606_chip_info_tbl[] = {
391 /* More devices added in future */
392 [ID_AD7605_4] = {
393 .channels = ad7605_channels,
394 .num_channels = 5,
395 },
396 [ID_AD7606_8] = {
397 .channels = ad7606_channels,
398 .num_channels = 9,
399 .oversampling_avail = ad7606_oversampling_avail,
400 .oversampling_num = ARRAY_SIZE(ad7606_oversampling_avail),
401 },
402 [ID_AD7606_6] = {
403 .channels = ad7606_channels,
404 .num_channels = 7,
405 .oversampling_avail = ad7606_oversampling_avail,
406 .oversampling_num = ARRAY_SIZE(ad7606_oversampling_avail),
407 },
408 [ID_AD7606_4] = {
409 .channels = ad7606_channels,
410 .num_channels = 5,
411 .oversampling_avail = ad7606_oversampling_avail,
412 .oversampling_num = ARRAY_SIZE(ad7606_oversampling_avail),
413 },
414 [ID_AD7606B] = {
415 .channels = ad7606_channels,
416 .num_channels = 9,
417 .oversampling_avail = ad7606_oversampling_avail,
418 .oversampling_num = ARRAY_SIZE(ad7606_oversampling_avail),
419 },
420 [ID_AD7616] = {
421 .channels = ad7616_channels,
422 .num_channels = 17,
423 .oversampling_avail = ad7616_oversampling_avail,
424 .oversampling_num = ARRAY_SIZE(ad7616_oversampling_avail),
425 .os_req_reset = true,
426 .init_delay_ms = 15,
427 },
428};
429
430static int ad7606_request_gpios(struct ad7606_state *st)
431{
432 struct device *dev = st->dev;
433
434 st->gpio_convst = devm_gpiod_get(dev, con_id: "adi,conversion-start",
435 flags: GPIOD_OUT_LOW);
436 if (IS_ERR(ptr: st->gpio_convst))
437 return PTR_ERR(ptr: st->gpio_convst);
438
439 st->gpio_reset = devm_gpiod_get_optional(dev, con_id: "reset", flags: GPIOD_OUT_LOW);
440 if (IS_ERR(ptr: st->gpio_reset))
441 return PTR_ERR(ptr: st->gpio_reset);
442
443 st->gpio_range = devm_gpiod_get_optional(dev, con_id: "adi,range",
444 flags: GPIOD_OUT_LOW);
445 if (IS_ERR(ptr: st->gpio_range))
446 return PTR_ERR(ptr: st->gpio_range);
447
448 st->gpio_standby = devm_gpiod_get_optional(dev, con_id: "standby",
449 flags: GPIOD_OUT_HIGH);
450 if (IS_ERR(ptr: st->gpio_standby))
451 return PTR_ERR(ptr: st->gpio_standby);
452
453 st->gpio_frstdata = devm_gpiod_get_optional(dev, con_id: "adi,first-data",
454 flags: GPIOD_IN);
455 if (IS_ERR(ptr: st->gpio_frstdata))
456 return PTR_ERR(ptr: st->gpio_frstdata);
457
458 if (!st->chip_info->oversampling_num)
459 return 0;
460
461 st->gpio_os = devm_gpiod_get_array_optional(dev,
462 con_id: "adi,oversampling-ratio",
463 flags: GPIOD_OUT_LOW);
464 return PTR_ERR_OR_ZERO(ptr: st->gpio_os);
465}
466
467/*
468 * The BUSY signal indicates when conversions are in progress, so when a rising
469 * edge of CONVST is applied, BUSY goes logic high and transitions low at the
470 * end of the entire conversion process. The falling edge of the BUSY signal
471 * triggers this interrupt.
472 */
473static irqreturn_t ad7606_interrupt(int irq, void *dev_id)
474{
475 struct iio_dev *indio_dev = dev_id;
476 struct ad7606_state *st = iio_priv(indio_dev);
477
478 if (iio_buffer_enabled(indio_dev)) {
479 gpiod_set_value(desc: st->gpio_convst, value: 0);
480 iio_trigger_poll_nested(trig: st->trig);
481 } else {
482 complete(&st->completion);
483 }
484
485 return IRQ_HANDLED;
486};
487
488static int ad7606_validate_trigger(struct iio_dev *indio_dev,
489 struct iio_trigger *trig)
490{
491 struct ad7606_state *st = iio_priv(indio_dev);
492
493 if (st->trig != trig)
494 return -EINVAL;
495
496 return 0;
497}
498
499static int ad7606_buffer_postenable(struct iio_dev *indio_dev)
500{
501 struct ad7606_state *st = iio_priv(indio_dev);
502
503 gpiod_set_value(desc: st->gpio_convst, value: 1);
504
505 return 0;
506}
507
508static int ad7606_buffer_predisable(struct iio_dev *indio_dev)
509{
510 struct ad7606_state *st = iio_priv(indio_dev);
511
512 gpiod_set_value(desc: st->gpio_convst, value: 0);
513
514 return 0;
515}
516
517static const struct iio_buffer_setup_ops ad7606_buffer_ops = {
518 .postenable = &ad7606_buffer_postenable,
519 .predisable = &ad7606_buffer_predisable,
520};
521
522static const struct iio_info ad7606_info_no_os_or_range = {
523 .read_raw = &ad7606_read_raw,
524 .validate_trigger = &ad7606_validate_trigger,
525};
526
527static const struct iio_info ad7606_info_os_and_range = {
528 .read_raw = &ad7606_read_raw,
529 .write_raw = &ad7606_write_raw,
530 .attrs = &ad7606_attribute_group_os_and_range,
531 .validate_trigger = &ad7606_validate_trigger,
532};
533
534static const struct iio_info ad7606_info_os_range_and_debug = {
535 .read_raw = &ad7606_read_raw,
536 .write_raw = &ad7606_write_raw,
537 .debugfs_reg_access = &ad7606_reg_access,
538 .attrs = &ad7606_attribute_group_os_and_range,
539 .validate_trigger = &ad7606_validate_trigger,
540};
541
542static const struct iio_info ad7606_info_os = {
543 .read_raw = &ad7606_read_raw,
544 .write_raw = &ad7606_write_raw,
545 .attrs = &ad7606_attribute_group_os,
546 .validate_trigger = &ad7606_validate_trigger,
547};
548
549static const struct iio_info ad7606_info_range = {
550 .read_raw = &ad7606_read_raw,
551 .write_raw = &ad7606_write_raw,
552 .attrs = &ad7606_attribute_group_range,
553 .validate_trigger = &ad7606_validate_trigger,
554};
555
556static const struct iio_trigger_ops ad7606_trigger_ops = {
557 .validate_device = iio_trigger_validate_own_device,
558};
559
560int ad7606_probe(struct device *dev, int irq, void __iomem *base_address,
561 const char *name, unsigned int id,
562 const struct ad7606_bus_ops *bops)
563{
564 struct ad7606_state *st;
565 int ret;
566 struct iio_dev *indio_dev;
567
568 indio_dev = devm_iio_device_alloc(parent: dev, sizeof_priv: sizeof(*st));
569 if (!indio_dev)
570 return -ENOMEM;
571
572 st = iio_priv(indio_dev);
573 dev_set_drvdata(dev, data: indio_dev);
574
575 st->dev = dev;
576 mutex_init(&st->lock);
577 st->bops = bops;
578 st->base_address = base_address;
579 /* tied to logic low, analog input range is +/- 5V */
580 st->range[0] = 0;
581 st->oversampling = 1;
582 st->scale_avail = ad7606_scale_avail;
583 st->num_scales = ARRAY_SIZE(ad7606_scale_avail);
584
585 ret = devm_regulator_get_enable(dev, id: "avcc");
586 if (ret)
587 return dev_err_probe(dev, err: ret,
588 fmt: "Failed to enable specified AVcc supply\n");
589
590 st->chip_info = &ad7606_chip_info_tbl[id];
591
592 if (st->chip_info->oversampling_num) {
593 st->oversampling_avail = st->chip_info->oversampling_avail;
594 st->num_os_ratios = st->chip_info->oversampling_num;
595 }
596
597 ret = ad7606_request_gpios(st);
598 if (ret)
599 return ret;
600
601 if (st->gpio_os) {
602 if (st->gpio_range)
603 indio_dev->info = &ad7606_info_os_and_range;
604 else
605 indio_dev->info = &ad7606_info_os;
606 } else {
607 if (st->gpio_range)
608 indio_dev->info = &ad7606_info_range;
609 else
610 indio_dev->info = &ad7606_info_no_os_or_range;
611 }
612 indio_dev->modes = INDIO_DIRECT_MODE;
613 indio_dev->name = name;
614 indio_dev->channels = st->chip_info->channels;
615 indio_dev->num_channels = st->chip_info->num_channels;
616
617 init_completion(x: &st->completion);
618
619 ret = ad7606_reset(st);
620 if (ret)
621 dev_warn(st->dev, "failed to RESET: no RESET GPIO specified\n");
622
623 /* AD7616 requires al least 15ms to reconfigure after a reset */
624 if (st->chip_info->init_delay_ms) {
625 if (msleep_interruptible(msecs: st->chip_info->init_delay_ms))
626 return -ERESTARTSYS;
627 }
628
629 st->write_scale = ad7606_write_scale_hw;
630 st->write_os = ad7606_write_os_hw;
631
632 if (st->bops->sw_mode_config)
633 st->sw_mode_en = device_property_present(dev: st->dev,
634 propname: "adi,sw-mode");
635
636 if (st->sw_mode_en) {
637 /* Scale of 0.076293 is only available in sw mode */
638 st->scale_avail = ad7616_sw_scale_avail;
639 st->num_scales = ARRAY_SIZE(ad7616_sw_scale_avail);
640
641 /* After reset, in software mode, ±10 V is set by default */
642 memset32(s: st->range, v: 2, ARRAY_SIZE(st->range));
643 indio_dev->info = &ad7606_info_os_range_and_debug;
644
645 ret = st->bops->sw_mode_config(indio_dev);
646 if (ret < 0)
647 return ret;
648 }
649
650 st->trig = devm_iio_trigger_alloc(dev, "%s-dev%d",
651 indio_dev->name,
652 iio_device_id(indio_dev));
653 if (!st->trig)
654 return -ENOMEM;
655
656 st->trig->ops = &ad7606_trigger_ops;
657 iio_trigger_set_drvdata(trig: st->trig, data: indio_dev);
658 ret = devm_iio_trigger_register(dev, trig_info: st->trig);
659 if (ret)
660 return ret;
661
662 indio_dev->trig = iio_trigger_get(trig: st->trig);
663
664 ret = devm_request_threaded_irq(dev, irq,
665 NULL,
666 thread_fn: &ad7606_interrupt,
667 IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
668 devname: name, dev_id: indio_dev);
669 if (ret)
670 return ret;
671
672 ret = devm_iio_triggered_buffer_setup(dev, indio_dev,
673 &iio_pollfunc_store_time,
674 &ad7606_trigger_handler,
675 &ad7606_buffer_ops);
676 if (ret)
677 return ret;
678
679 return devm_iio_device_register(dev, indio_dev);
680}
681EXPORT_SYMBOL_NS_GPL(ad7606_probe, IIO_AD7606);
682
683#ifdef CONFIG_PM_SLEEP
684
685static int ad7606_suspend(struct device *dev)
686{
687 struct iio_dev *indio_dev = dev_get_drvdata(dev);
688 struct ad7606_state *st = iio_priv(indio_dev);
689
690 if (st->gpio_standby) {
691 gpiod_set_value(desc: st->gpio_range, value: 1);
692 gpiod_set_value(desc: st->gpio_standby, value: 0);
693 }
694
695 return 0;
696}
697
698static int ad7606_resume(struct device *dev)
699{
700 struct iio_dev *indio_dev = dev_get_drvdata(dev);
701 struct ad7606_state *st = iio_priv(indio_dev);
702
703 if (st->gpio_standby) {
704 gpiod_set_value(desc: st->gpio_range, value: st->range[0]);
705 gpiod_set_value(desc: st->gpio_standby, value: 1);
706 ad7606_reset(st);
707 }
708
709 return 0;
710}
711
712SIMPLE_DEV_PM_OPS(ad7606_pm_ops, ad7606_suspend, ad7606_resume);
713EXPORT_SYMBOL_NS_GPL(ad7606_pm_ops, IIO_AD7606);
714
715#endif
716
717MODULE_AUTHOR("Michael Hennerich <michael.hennerich@analog.com>");
718MODULE_DESCRIPTION("Analog Devices AD7606 ADC");
719MODULE_LICENSE("GPL v2");
720

source code of linux/drivers/iio/adc/ad7606.c