1 // SPDX-License-Identifier: GPL-2.0-only
4 * Copyright (C) 2010-2011 Michael Hennerich, Analog Devices Inc.
6 * based on iio/adc/max1363
7 * Copyright (C) 2008-2010 Jonathan Cameron
9 * based on linux/drivers/i2c/chips/max123x
10 * Copyright (C) 2002-2004 Stefan Eletzhofer
12 * based on linux/drivers/acron/char/pcf8583.c
13 * Copyright (C) 2000 Russell King
17 * Support for ad7991, ad7995, ad7999, ad7992, ad7993, ad7994, ad7997,
18 * ad7998 and similar chips.
21 #include <linux/interrupt.h>
22 #include <linux/device.h>
23 #include <linux/kernel.h>
24 #include <linux/sysfs.h>
25 #include <linux/i2c.h>
26 #include <linux/regulator/consumer.h>
27 #include <linux/slab.h>
28 #include <linux/types.h>
29 #include <linux/err.h>
30 #include <linux/module.h>
31 #include <linux/bitops.h>
33 #include <linux/iio/iio.h>
34 #include <linux/iio/sysfs.h>
35 #include <linux/iio/events.h>
36 #include <linux/iio/buffer.h>
37 #include <linux/iio/trigger_consumer.h>
38 #include <linux/iio/triggered_buffer.h>
40 #define AD799X_CHANNEL_SHIFT 4
43 * AD7991, AD7995 and AD7999 defines
46 #define AD7991_REF_SEL 0x08
47 #define AD7991_FLTR 0x04
48 #define AD7991_BIT_TRIAL_DELAY 0x02
49 #define AD7991_SAMPLE_DELAY 0x01
52 * AD7992, AD7993, AD7994, AD7997 and AD7998 defines
55 #define AD7998_FLTR BIT(3)
56 #define AD7998_ALERT_EN BIT(2)
57 #define AD7998_BUSY_ALERT BIT(1)
58 #define AD7998_BUSY_ALERT_POL BIT(0)
60 #define AD7998_CONV_RES_REG 0x0
61 #define AD7998_ALERT_STAT_REG 0x1
62 #define AD7998_CONF_REG 0x2
63 #define AD7998_CYCLE_TMR_REG 0x3
65 #define AD7998_DATALOW_REG(x) ((x) * 3 + 0x4)
66 #define AD7998_DATAHIGH_REG(x) ((x) * 3 + 0x5)
67 #define AD7998_HYST_REG(x) ((x) * 3 + 0x6)
69 #define AD7998_CYC_MASK GENMASK(2, 0)
70 #define AD7998_CYC_DIS 0x0
71 #define AD7998_CYC_TCONF_32 0x1
72 #define AD7998_CYC_TCONF_64 0x2
73 #define AD7998_CYC_TCONF_128 0x3
74 #define AD7998_CYC_TCONF_256 0x4
75 #define AD7998_CYC_TCONF_512 0x5
76 #define AD7998_CYC_TCONF_1024 0x6
77 #define AD7998_CYC_TCONF_2048 0x7
79 #define AD7998_ALERT_STAT_CLEAR 0xFF
82 * AD7997 and AD7997 defines
85 #define AD7997_8_READ_SINGLE BIT(7)
86 #define AD7997_8_READ_SEQUENCE (BIT(6) | BIT(5) | BIT(4))
100 * struct ad799x_chip_config - chip specific information
101 * @channel: channel specification
102 * @default_config: device default configuration
103 * @info: pointer to iio_info struct
105 struct ad799x_chip_config {
106 const struct iio_chan_spec channel[9];
108 const struct iio_info *info;
112 * struct ad799x_chip_info - chip specific information
113 * @num_channels: number of channels
114 * @noirq_config: device configuration w/o IRQ
115 * @irq_config: device configuration w/IRQ
117 struct ad799x_chip_info {
119 const struct ad799x_chip_config noirq_config;
120 const struct ad799x_chip_config irq_config;
123 struct ad799x_state {
124 struct i2c_client *client;
125 const struct ad799x_chip_config *chip_config;
126 struct regulator *reg;
127 struct regulator *vref;
132 unsigned int transfer_size;
135 static int ad799x_write_config(struct ad799x_state *st, u16 val)
140 return i2c_smbus_write_word_swapped(st->client, AD7998_CONF_REG,
145 return i2c_smbus_write_byte_data(st->client, AD7998_CONF_REG,
148 /* Will be written when doing a conversion */
154 static int ad799x_read_config(struct ad799x_state *st)
159 return i2c_smbus_read_word_swapped(st->client, AD7998_CONF_REG);
163 return i2c_smbus_read_byte_data(st->client, AD7998_CONF_REG);
165 /* No readback support */
170 static int ad799x_update_config(struct ad799x_state *st, u16 config)
174 ret = ad799x_write_config(st, config);
177 ret = ad799x_read_config(st);
185 static irqreturn_t ad799x_trigger_handler(int irq, void *p)
187 struct iio_poll_func *pf = p;
188 struct iio_dev *indio_dev = pf->indio_dev;
189 struct ad799x_state *st = iio_priv(indio_dev);
198 (*indio_dev->active_scan_mask << AD799X_CHANNEL_SHIFT);
203 cmd = (*indio_dev->active_scan_mask << AD799X_CHANNEL_SHIFT) |
208 cmd = AD7997_8_READ_SEQUENCE | AD7998_CONV_RES_REG;
214 b_sent = i2c_smbus_read_i2c_block_data(st->client,
215 cmd, st->transfer_size, st->rx_buf);
219 iio_push_to_buffers_with_timestamp(indio_dev, st->rx_buf,
220 iio_get_time_ns(indio_dev));
222 iio_trigger_notify_done(indio_dev->trig);
227 static int ad799x_update_scan_mode(struct iio_dev *indio_dev,
228 const unsigned long *scan_mask)
230 struct ad799x_state *st = iio_priv(indio_dev);
233 st->rx_buf = kmalloc(indio_dev->scan_bytes, GFP_KERNEL);
237 st->transfer_size = bitmap_weight(scan_mask, indio_dev->masklength) * 2;
245 st->config &= ~(GENMASK(7, 0) << AD799X_CHANNEL_SHIFT);
246 st->config |= (*scan_mask << AD799X_CHANNEL_SHIFT);
247 return ad799x_write_config(st, st->config);
253 static int ad799x_scan_direct(struct ad799x_state *st, unsigned ch)
261 cmd = st->config | (BIT(ch) << AD799X_CHANNEL_SHIFT);
266 cmd = BIT(ch) << AD799X_CHANNEL_SHIFT;
270 cmd = (ch << AD799X_CHANNEL_SHIFT) | AD7997_8_READ_SINGLE;
276 return i2c_smbus_read_word_swapped(st->client, cmd);
279 static int ad799x_read_raw(struct iio_dev *indio_dev,
280 struct iio_chan_spec const *chan,
286 struct ad799x_state *st = iio_priv(indio_dev);
289 case IIO_CHAN_INFO_RAW:
290 ret = iio_device_claim_direct_mode(indio_dev);
293 ret = ad799x_scan_direct(st, chan->scan_index);
294 iio_device_release_direct_mode(indio_dev);
298 *val = (ret >> chan->scan_type.shift) &
299 GENMASK(chan->scan_type.realbits - 1, 0);
301 case IIO_CHAN_INFO_SCALE:
303 ret = regulator_get_voltage(st->vref);
305 ret = regulator_get_voltage(st->reg);
310 *val2 = chan->scan_type.realbits;
311 return IIO_VAL_FRACTIONAL_LOG2;
315 static const unsigned int ad7998_frequencies[] = {
316 [AD7998_CYC_DIS] = 0,
317 [AD7998_CYC_TCONF_32] = 15625,
318 [AD7998_CYC_TCONF_64] = 7812,
319 [AD7998_CYC_TCONF_128] = 3906,
320 [AD7998_CYC_TCONF_512] = 976,
321 [AD7998_CYC_TCONF_1024] = 488,
322 [AD7998_CYC_TCONF_2048] = 244,
325 static ssize_t ad799x_read_frequency(struct device *dev,
326 struct device_attribute *attr,
329 struct iio_dev *indio_dev = dev_to_iio_dev(dev);
330 struct ad799x_state *st = iio_priv(indio_dev);
332 int ret = i2c_smbus_read_byte_data(st->client, AD7998_CYCLE_TMR_REG);
336 return sprintf(buf, "%u\n", ad7998_frequencies[ret & AD7998_CYC_MASK]);
339 static ssize_t ad799x_write_frequency(struct device *dev,
340 struct device_attribute *attr,
344 struct iio_dev *indio_dev = dev_to_iio_dev(dev);
345 struct ad799x_state *st = iio_priv(indio_dev);
350 ret = kstrtol(buf, 10, &val);
354 mutex_lock(&indio_dev->mlock);
355 ret = i2c_smbus_read_byte_data(st->client, AD7998_CYCLE_TMR_REG);
357 goto error_ret_mutex;
358 /* Wipe the bits clean */
359 ret &= ~AD7998_CYC_MASK;
361 for (i = 0; i < ARRAY_SIZE(ad7998_frequencies); i++)
362 if (val == ad7998_frequencies[i])
364 if (i == ARRAY_SIZE(ad7998_frequencies)) {
366 goto error_ret_mutex;
369 ret = i2c_smbus_write_byte_data(st->client, AD7998_CYCLE_TMR_REG,
372 goto error_ret_mutex;
376 mutex_unlock(&indio_dev->mlock);
381 static int ad799x_read_event_config(struct iio_dev *indio_dev,
382 const struct iio_chan_spec *chan,
383 enum iio_event_type type,
384 enum iio_event_direction dir)
386 struct ad799x_state *st = iio_priv(indio_dev);
388 if (!(st->config & AD7998_ALERT_EN))
391 if ((st->config >> AD799X_CHANNEL_SHIFT) & BIT(chan->scan_index))
397 static int ad799x_write_event_config(struct iio_dev *indio_dev,
398 const struct iio_chan_spec *chan,
399 enum iio_event_type type,
400 enum iio_event_direction dir,
403 struct ad799x_state *st = iio_priv(indio_dev);
406 ret = iio_device_claim_direct_mode(indio_dev);
411 st->config |= BIT(chan->scan_index) << AD799X_CHANNEL_SHIFT;
413 st->config &= ~(BIT(chan->scan_index) << AD799X_CHANNEL_SHIFT);
415 if (st->config >> AD799X_CHANNEL_SHIFT)
416 st->config |= AD7998_ALERT_EN;
418 st->config &= ~AD7998_ALERT_EN;
420 ret = ad799x_write_config(st, st->config);
421 iio_device_release_direct_mode(indio_dev);
425 static unsigned int ad799x_threshold_reg(const struct iio_chan_spec *chan,
426 enum iio_event_direction dir,
427 enum iio_event_info info)
430 case IIO_EV_INFO_VALUE:
431 if (dir == IIO_EV_DIR_FALLING)
432 return AD7998_DATALOW_REG(chan->channel);
434 return AD7998_DATAHIGH_REG(chan->channel);
435 case IIO_EV_INFO_HYSTERESIS:
436 return AD7998_HYST_REG(chan->channel);
444 static int ad799x_write_event_value(struct iio_dev *indio_dev,
445 const struct iio_chan_spec *chan,
446 enum iio_event_type type,
447 enum iio_event_direction dir,
448 enum iio_event_info info,
452 struct ad799x_state *st = iio_priv(indio_dev);
454 if (val < 0 || val > GENMASK(chan->scan_type.realbits - 1, 0))
457 mutex_lock(&indio_dev->mlock);
458 ret = i2c_smbus_write_word_swapped(st->client,
459 ad799x_threshold_reg(chan, dir, info),
460 val << chan->scan_type.shift);
461 mutex_unlock(&indio_dev->mlock);
466 static int ad799x_read_event_value(struct iio_dev *indio_dev,
467 const struct iio_chan_spec *chan,
468 enum iio_event_type type,
469 enum iio_event_direction dir,
470 enum iio_event_info info,
474 struct ad799x_state *st = iio_priv(indio_dev);
476 mutex_lock(&indio_dev->mlock);
477 ret = i2c_smbus_read_word_swapped(st->client,
478 ad799x_threshold_reg(chan, dir, info));
479 mutex_unlock(&indio_dev->mlock);
482 *val = (ret >> chan->scan_type.shift) &
483 GENMASK(chan->scan_type.realbits - 1, 0);
488 static irqreturn_t ad799x_event_handler(int irq, void *private)
490 struct iio_dev *indio_dev = private;
491 struct ad799x_state *st = iio_priv(private);
494 ret = i2c_smbus_read_byte_data(st->client, AD7998_ALERT_STAT_REG);
498 if (i2c_smbus_write_byte_data(st->client, AD7998_ALERT_STAT_REG,
499 AD7998_ALERT_STAT_CLEAR) < 0)
502 for (i = 0; i < 8; i++) {
504 iio_push_event(indio_dev,
506 IIO_UNMOD_EVENT_CODE(IIO_VOLTAGE,
510 IIO_UNMOD_EVENT_CODE(IIO_VOLTAGE,
514 iio_get_time_ns(indio_dev));
521 static IIO_DEV_ATTR_SAMP_FREQ(S_IWUSR | S_IRUGO,
522 ad799x_read_frequency,
523 ad799x_write_frequency);
524 static IIO_CONST_ATTR_SAMP_FREQ_AVAIL("15625 7812 3906 1953 976 488 244 0");
526 static struct attribute *ad799x_event_attributes[] = {
527 &iio_dev_attr_sampling_frequency.dev_attr.attr,
528 &iio_const_attr_sampling_frequency_available.dev_attr.attr,
532 static const struct attribute_group ad799x_event_attrs_group = {
533 .attrs = ad799x_event_attributes,
536 static const struct iio_info ad7991_info = {
537 .read_raw = &ad799x_read_raw,
538 .update_scan_mode = ad799x_update_scan_mode,
541 static const struct iio_info ad7993_4_7_8_noirq_info = {
542 .read_raw = &ad799x_read_raw,
543 .update_scan_mode = ad799x_update_scan_mode,
546 static const struct iio_info ad7993_4_7_8_irq_info = {
547 .read_raw = &ad799x_read_raw,
548 .event_attrs = &ad799x_event_attrs_group,
549 .read_event_config = &ad799x_read_event_config,
550 .write_event_config = &ad799x_write_event_config,
551 .read_event_value = &ad799x_read_event_value,
552 .write_event_value = &ad799x_write_event_value,
553 .update_scan_mode = ad799x_update_scan_mode,
556 static const struct iio_event_spec ad799x_events[] = {
558 .type = IIO_EV_TYPE_THRESH,
559 .dir = IIO_EV_DIR_RISING,
560 .mask_separate = BIT(IIO_EV_INFO_VALUE) |
561 BIT(IIO_EV_INFO_ENABLE),
563 .type = IIO_EV_TYPE_THRESH,
564 .dir = IIO_EV_DIR_FALLING,
565 .mask_separate = BIT(IIO_EV_INFO_VALUE) |
566 BIT(IIO_EV_INFO_ENABLE),
568 .type = IIO_EV_TYPE_THRESH,
569 .dir = IIO_EV_DIR_EITHER,
570 .mask_separate = BIT(IIO_EV_INFO_HYSTERESIS),
574 #define _AD799X_CHANNEL(_index, _realbits, _ev_spec, _num_ev_spec) { \
575 .type = IIO_VOLTAGE, \
577 .channel = (_index), \
578 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \
579 .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE), \
580 .scan_index = (_index), \
583 .realbits = (_realbits), \
585 .shift = 12 - (_realbits), \
586 .endianness = IIO_BE, \
588 .event_spec = _ev_spec, \
589 .num_event_specs = _num_ev_spec, \
592 #define AD799X_CHANNEL(_index, _realbits) \
593 _AD799X_CHANNEL(_index, _realbits, NULL, 0)
595 #define AD799X_CHANNEL_WITH_EVENTS(_index, _realbits) \
596 _AD799X_CHANNEL(_index, _realbits, ad799x_events, \
597 ARRAY_SIZE(ad799x_events))
599 static const struct ad799x_chip_info ad799x_chip_info_tbl[] = {
604 AD799X_CHANNEL(0, 12),
605 AD799X_CHANNEL(1, 12),
606 AD799X_CHANNEL(2, 12),
607 AD799X_CHANNEL(3, 12),
608 IIO_CHAN_SOFT_TIMESTAMP(4),
610 .info = &ad7991_info,
617 AD799X_CHANNEL(0, 10),
618 AD799X_CHANNEL(1, 10),
619 AD799X_CHANNEL(2, 10),
620 AD799X_CHANNEL(3, 10),
621 IIO_CHAN_SOFT_TIMESTAMP(4),
623 .info = &ad7991_info,
630 AD799X_CHANNEL(0, 8),
631 AD799X_CHANNEL(1, 8),
632 AD799X_CHANNEL(2, 8),
633 AD799X_CHANNEL(3, 8),
634 IIO_CHAN_SOFT_TIMESTAMP(4),
636 .info = &ad7991_info,
643 AD799X_CHANNEL(0, 12),
644 AD799X_CHANNEL(1, 12),
645 IIO_CHAN_SOFT_TIMESTAMP(3),
647 .info = &ad7993_4_7_8_noirq_info,
651 AD799X_CHANNEL_WITH_EVENTS(0, 12),
652 AD799X_CHANNEL_WITH_EVENTS(1, 12),
653 IIO_CHAN_SOFT_TIMESTAMP(3),
655 .default_config = AD7998_ALERT_EN | AD7998_BUSY_ALERT,
656 .info = &ad7993_4_7_8_irq_info,
663 AD799X_CHANNEL(0, 10),
664 AD799X_CHANNEL(1, 10),
665 AD799X_CHANNEL(2, 10),
666 AD799X_CHANNEL(3, 10),
667 IIO_CHAN_SOFT_TIMESTAMP(4),
669 .info = &ad7993_4_7_8_noirq_info,
673 AD799X_CHANNEL_WITH_EVENTS(0, 10),
674 AD799X_CHANNEL_WITH_EVENTS(1, 10),
675 AD799X_CHANNEL_WITH_EVENTS(2, 10),
676 AD799X_CHANNEL_WITH_EVENTS(3, 10),
677 IIO_CHAN_SOFT_TIMESTAMP(4),
679 .default_config = AD7998_ALERT_EN | AD7998_BUSY_ALERT,
680 .info = &ad7993_4_7_8_irq_info,
687 AD799X_CHANNEL(0, 12),
688 AD799X_CHANNEL(1, 12),
689 AD799X_CHANNEL(2, 12),
690 AD799X_CHANNEL(3, 12),
691 IIO_CHAN_SOFT_TIMESTAMP(4),
693 .info = &ad7993_4_7_8_noirq_info,
697 AD799X_CHANNEL_WITH_EVENTS(0, 12),
698 AD799X_CHANNEL_WITH_EVENTS(1, 12),
699 AD799X_CHANNEL_WITH_EVENTS(2, 12),
700 AD799X_CHANNEL_WITH_EVENTS(3, 12),
701 IIO_CHAN_SOFT_TIMESTAMP(4),
703 .default_config = AD7998_ALERT_EN | AD7998_BUSY_ALERT,
704 .info = &ad7993_4_7_8_irq_info,
711 AD799X_CHANNEL(0, 10),
712 AD799X_CHANNEL(1, 10),
713 AD799X_CHANNEL(2, 10),
714 AD799X_CHANNEL(3, 10),
715 AD799X_CHANNEL(4, 10),
716 AD799X_CHANNEL(5, 10),
717 AD799X_CHANNEL(6, 10),
718 AD799X_CHANNEL(7, 10),
719 IIO_CHAN_SOFT_TIMESTAMP(8),
721 .info = &ad7993_4_7_8_noirq_info,
725 AD799X_CHANNEL_WITH_EVENTS(0, 10),
726 AD799X_CHANNEL_WITH_EVENTS(1, 10),
727 AD799X_CHANNEL_WITH_EVENTS(2, 10),
728 AD799X_CHANNEL_WITH_EVENTS(3, 10),
729 AD799X_CHANNEL(4, 10),
730 AD799X_CHANNEL(5, 10),
731 AD799X_CHANNEL(6, 10),
732 AD799X_CHANNEL(7, 10),
733 IIO_CHAN_SOFT_TIMESTAMP(8),
735 .default_config = AD7998_ALERT_EN | AD7998_BUSY_ALERT,
736 .info = &ad7993_4_7_8_irq_info,
743 AD799X_CHANNEL(0, 12),
744 AD799X_CHANNEL(1, 12),
745 AD799X_CHANNEL(2, 12),
746 AD799X_CHANNEL(3, 12),
747 AD799X_CHANNEL(4, 12),
748 AD799X_CHANNEL(5, 12),
749 AD799X_CHANNEL(6, 12),
750 AD799X_CHANNEL(7, 12),
751 IIO_CHAN_SOFT_TIMESTAMP(8),
753 .info = &ad7993_4_7_8_noirq_info,
757 AD799X_CHANNEL_WITH_EVENTS(0, 12),
758 AD799X_CHANNEL_WITH_EVENTS(1, 12),
759 AD799X_CHANNEL_WITH_EVENTS(2, 12),
760 AD799X_CHANNEL_WITH_EVENTS(3, 12),
761 AD799X_CHANNEL(4, 12),
762 AD799X_CHANNEL(5, 12),
763 AD799X_CHANNEL(6, 12),
764 AD799X_CHANNEL(7, 12),
765 IIO_CHAN_SOFT_TIMESTAMP(8),
767 .default_config = AD7998_ALERT_EN | AD7998_BUSY_ALERT,
768 .info = &ad7993_4_7_8_irq_info,
773 static int ad799x_probe(struct i2c_client *client,
774 const struct i2c_device_id *id)
777 int extra_config = 0;
778 struct ad799x_state *st;
779 struct iio_dev *indio_dev;
780 const struct ad799x_chip_info *chip_info =
781 &ad799x_chip_info_tbl[id->driver_data];
783 indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*st));
784 if (indio_dev == NULL)
787 st = iio_priv(indio_dev);
788 /* this is only used for device removal purposes */
789 i2c_set_clientdata(client, indio_dev);
791 st->id = id->driver_data;
792 if (client->irq > 0 && chip_info->irq_config.info)
793 st->chip_config = &chip_info->irq_config;
795 st->chip_config = &chip_info->noirq_config;
797 /* TODO: Add pdata options for filtering and bit delay */
799 st->reg = devm_regulator_get(&client->dev, "vcc");
801 return PTR_ERR(st->reg);
802 ret = regulator_enable(st->reg);
806 /* check if an external reference is supplied */
807 st->vref = devm_regulator_get_optional(&client->dev, "vref");
809 if (IS_ERR(st->vref)) {
810 if (PTR_ERR(st->vref) == -ENODEV) {
812 dev_info(&client->dev, "Using VCC reference voltage\n");
814 ret = PTR_ERR(st->vref);
815 goto error_disable_reg;
821 * Use external reference voltage if supported by hardware.
822 * This is optional if voltage / regulator present, use VCC otherwise.
824 if ((st->id == ad7991) || (st->id == ad7995) || (st->id == ad7999)) {
825 dev_info(&client->dev, "Using external reference voltage\n");
826 extra_config |= AD7991_REF_SEL;
827 ret = regulator_enable(st->vref);
829 goto error_disable_reg;
832 dev_warn(&client->dev, "Supplied reference not supported\n");
838 indio_dev->name = id->name;
839 indio_dev->info = st->chip_config->info;
841 indio_dev->modes = INDIO_DIRECT_MODE;
842 indio_dev->channels = st->chip_config->channel;
843 indio_dev->num_channels = chip_info->num_channels;
845 ret = ad799x_update_config(st, st->chip_config->default_config | extra_config);
847 goto error_disable_vref;
849 ret = iio_triggered_buffer_setup(indio_dev, NULL,
850 &ad799x_trigger_handler, NULL);
852 goto error_disable_vref;
854 if (client->irq > 0) {
855 ret = devm_request_threaded_irq(&client->dev,
858 ad799x_event_handler,
859 IRQF_TRIGGER_FALLING |
864 goto error_cleanup_ring;
866 ret = iio_device_register(indio_dev);
868 goto error_cleanup_ring;
873 iio_triggered_buffer_cleanup(indio_dev);
876 regulator_disable(st->vref);
878 regulator_disable(st->reg);
883 static int ad799x_remove(struct i2c_client *client)
885 struct iio_dev *indio_dev = i2c_get_clientdata(client);
886 struct ad799x_state *st = iio_priv(indio_dev);
888 iio_device_unregister(indio_dev);
890 iio_triggered_buffer_cleanup(indio_dev);
892 regulator_disable(st->vref);
893 regulator_disable(st->reg);
899 static int __maybe_unused ad799x_suspend(struct device *dev)
901 struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
902 struct ad799x_state *st = iio_priv(indio_dev);
905 regulator_disable(st->vref);
906 regulator_disable(st->reg);
911 static int __maybe_unused ad799x_resume(struct device *dev)
913 struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
914 struct ad799x_state *st = iio_priv(indio_dev);
917 ret = regulator_enable(st->reg);
919 dev_err(dev, "Unable to enable vcc regulator\n");
924 ret = regulator_enable(st->vref);
926 regulator_disable(st->reg);
927 dev_err(dev, "Unable to enable vref regulator\n");
933 ret = ad799x_update_config(st, st->config);
936 regulator_disable(st->vref);
937 regulator_disable(st->reg);
944 static SIMPLE_DEV_PM_OPS(ad799x_pm_ops, ad799x_suspend, ad799x_resume);
946 static const struct i2c_device_id ad799x_id[] = {
947 { "ad7991", ad7991 },
948 { "ad7995", ad7995 },
949 { "ad7999", ad7999 },
950 { "ad7992", ad7992 },
951 { "ad7993", ad7993 },
952 { "ad7994", ad7994 },
953 { "ad7997", ad7997 },
954 { "ad7998", ad7998 },
958 MODULE_DEVICE_TABLE(i2c, ad799x_id);
960 static struct i2c_driver ad799x_driver = {
963 .pm = &ad799x_pm_ops,
965 .probe = ad799x_probe,
966 .remove = ad799x_remove,
967 .id_table = ad799x_id,
969 module_i2c_driver(ad799x_driver);
971 MODULE_AUTHOR("Michael Hennerich <michael.hennerich@analog.com>");
972 MODULE_DESCRIPTION("Analog Devices AD799x ADC");
973 MODULE_LICENSE("GPL v2");