ad799x.c

  1// SPDX-License-Identifier: GPL-2.0-only
  2/*
  3 * iio/adc/ad799x.c
  4 * Copyright (C) 2010-2011 Michael Hennerich, Analog Devices Inc.
  5 *
  6 * based on iio/adc/max1363
  7 * Copyright (C) 2008-2010 Jonathan Cameron
  8 *
  9 * based on linux/drivers/i2c/chips/max123x
 10 * Copyright (C) 2002-2004 Stefan Eletzhofer
 11 *
 12 * based on linux/drivers/acron/char/pcf8583.c
 13 * Copyright (C) 2000 Russell King
 14 *
 15 * ad799x.c
 16 *
 17 * Support for ad7991, ad7995, ad7999, ad7992, ad7993, ad7994, ad7997,
 18 * ad7998 and similar chips.
 19 */
 20
 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/mutex.h>
 32#include <linux/bitops.h>
 33
 34#include <linux/iio/iio.h>
 35#include <linux/iio/sysfs.h>
 36#include <linux/iio/events.h>
 37#include <linux/iio/buffer.h>
 38#include <linux/iio/trigger_consumer.h>
 39#include <linux/iio/triggered_buffer.h>
 40
 41#define AD799X_CHANNEL_SHIFT			4
 42
 43/*
 44 * AD7991, AD7995 and AD7999 defines
 45 */
 46
 47#define AD7991_REF_SEL				0x08
 48#define AD7991_FLTR				0x04
 49#define AD7991_BIT_TRIAL_DELAY			0x02
 50#define AD7991_SAMPLE_DELAY			0x01
 51
 52/*
 53 * AD7992, AD7993, AD7994, AD7997 and AD7998 defines
 54 */
 55
 56#define AD7998_FLTR				BIT(3)
 57#define AD7998_ALERT_EN				BIT(2)
 58#define AD7998_BUSY_ALERT			BIT(1)
 59#define AD7998_BUSY_ALERT_POL			BIT(0)
 60
 61#define AD7998_CONV_RES_REG			0x0
 62#define AD7998_ALERT_STAT_REG			0x1
 63#define AD7998_CONF_REG				0x2
 64#define AD7998_CYCLE_TMR_REG			0x3
 65
 66#define AD7998_DATALOW_REG(x)			((x) * 3 + 0x4)
 67#define AD7998_DATAHIGH_REG(x)			((x) * 3 + 0x5)
 68#define AD7998_HYST_REG(x)			((x) * 3 + 0x6)
 69
 70#define AD7998_CYC_MASK				GENMASK(2, 0)
 71#define AD7998_CYC_DIS				0x0
 72#define AD7998_CYC_TCONF_32			0x1
 73#define AD7998_CYC_TCONF_64			0x2
 74#define AD7998_CYC_TCONF_128			0x3
 75#define AD7998_CYC_TCONF_256			0x4
 76#define AD7998_CYC_TCONF_512			0x5
 77#define AD7998_CYC_TCONF_1024			0x6
 78#define AD7998_CYC_TCONF_2048			0x7
 79
 80#define AD7998_ALERT_STAT_CLEAR			0xFF
 81
 82/*
 83 * AD7997 and AD7997 defines
 84 */
 85
 86#define AD7997_8_READ_SINGLE			BIT(7)
 87#define AD7997_8_READ_SEQUENCE			(BIT(6) | BIT(5) | BIT(4))
 88
 89enum {
 90	ad7991,
 91	ad7995,
 92	ad7999,
 93	ad7992,
 94	ad7993,
 95	ad7994,
 96	ad7997,
 97	ad7998
 98};
 99
100/**
101 * struct ad799x_chip_config - chip specific information
102 * @channel:		channel specification
103 * @default_config:	device default configuration
104 * @info:		pointer to iio_info struct
105 */
106struct ad799x_chip_config {
107	const struct iio_chan_spec	channel[9];
108	u16				default_config;
109	const struct iio_info		*info;
110};
111
112/**
113 * struct ad799x_chip_info - chip specific information
114 * @num_channels:	number of channels
115 * @noirq_config:	device configuration w/o IRQ
116 * @irq_config:		device configuration w/IRQ
117 * @has_vref:		device supports external reference voltage
118 */
119struct ad799x_chip_info {
120	int				num_channels;
121	const struct ad799x_chip_config	noirq_config;
122	const struct ad799x_chip_config	irq_config;
123	bool has_vref;
124};
125
126struct ad799x_state {
127	struct i2c_client		*client;
128	const struct ad799x_chip_config	*chip_config;
129	struct regulator		*reg;
130	struct regulator		*vref;
131	/* lock to protect against multiple access to the device */
132	struct mutex			lock;
133	unsigned int			id;
134	u16				config;
135
136	u8				*rx_buf;
137	unsigned int			transfer_size;
138};
139
140static int ad799x_write_config(struct ad799x_state *st, u16 val)
141{
142	switch (st->id) {
143	case ad7997:
144	case ad7998:
145		return i2c_smbus_write_word_swapped(st->client, AD7998_CONF_REG,
146			val);
147	case ad7992:
148	case ad7993:
149	case ad7994:
150		return i2c_smbus_write_byte_data(st->client, AD7998_CONF_REG,
151			val);
152	default:
153		/* Will be written when doing a conversion */
154		st->config = val;
155		return 0;
156	}
157}
158
159static int ad799x_read_config(struct ad799x_state *st)
160{
161	switch (st->id) {
162	case ad7997:
163	case ad7998:
164		return i2c_smbus_read_word_swapped(st->client, AD7998_CONF_REG);
165	case ad7992:
166	case ad7993:
167	case ad7994:
168		return i2c_smbus_read_byte_data(st->client, AD7998_CONF_REG);
169	default:
170		/* No readback support */
171		return st->config;
172	}
173}
174
175static int ad799x_update_config(struct ad799x_state *st, u16 config)
176{
177	int ret;
178
179	ret = ad799x_write_config(st, config);
180	if (ret < 0)
181		return ret;
182	ret = ad799x_read_config(st);
183	if (ret < 0)
184		return ret;
185	st->config = ret;
186
187	return 0;
188}
189
190static irqreturn_t ad799x_trigger_handler(int irq, void *p)
191{
192	struct iio_poll_func *pf = p;
193	struct iio_dev *indio_dev = pf->indio_dev;
194	struct ad799x_state *st = iio_priv(indio_dev);
195	int b_sent;
196	u8 cmd;
197
198	switch (st->id) {
199	case ad7991:
200	case ad7995:
201	case ad7999:
202		cmd = st->config |
203			(*indio_dev->active_scan_mask << AD799X_CHANNEL_SHIFT);
204		break;
205	case ad7992:
206	case ad7993:
207	case ad7994:
208		cmd = (*indio_dev->active_scan_mask << AD799X_CHANNEL_SHIFT) |
209			AD7998_CONV_RES_REG;
210		break;
211	case ad7997:
212	case ad7998:
213		cmd = AD7997_8_READ_SEQUENCE | AD7998_CONV_RES_REG;
214		break;
215	default:
216		cmd = 0;
217	}
218
219	b_sent = i2c_smbus_read_i2c_block_data(st->client,
220			cmd, st->transfer_size, st->rx_buf);
221	if (b_sent < 0)
222		goto out;
223
224	iio_push_to_buffers_with_timestamp(indio_dev, st->rx_buf,
225			iio_get_time_ns(indio_dev));
226out:
227	iio_trigger_notify_done(indio_dev->trig);
228
229	return IRQ_HANDLED;
230}
231
232static int ad799x_update_scan_mode(struct iio_dev *indio_dev,
233	const unsigned long *scan_mask)
234{
235	struct ad799x_state *st = iio_priv(indio_dev);
236
237	kfree(st->rx_buf);
238	st->rx_buf = kmalloc(indio_dev->scan_bytes, GFP_KERNEL);
239	if (!st->rx_buf)
240		return -ENOMEM;
241
242	st->transfer_size = bitmap_weight(scan_mask,
243					  iio_get_masklength(indio_dev)) * 2;
244
245	switch (st->id) {
246	case ad7992:
247	case ad7993:
248	case ad7994:
249	case ad7997:
250	case ad7998:
251		st->config &= ~(GENMASK(7, 0) << AD799X_CHANNEL_SHIFT);
252		st->config |= (*scan_mask << AD799X_CHANNEL_SHIFT);
253		return ad799x_write_config(st, st->config);
254	default:
255		return 0;
256	}
257}
258
259static int ad799x_scan_direct(struct ad799x_state *st, unsigned int ch)
260{
261	u8 cmd;
262
263	switch (st->id) {
264	case ad7991:
265	case ad7995:
266	case ad7999:
267		cmd = st->config | (BIT(ch) << AD799X_CHANNEL_SHIFT);
268		break;
269	case ad7992:
270	case ad7993:
271	case ad7994:
272		cmd = BIT(ch) << AD799X_CHANNEL_SHIFT;
273		break;
274	case ad7997:
275	case ad7998:
276		cmd = (ch << AD799X_CHANNEL_SHIFT) | AD7997_8_READ_SINGLE;
277		break;
278	default:
279		return -EINVAL;
280	}
281
282	return i2c_smbus_read_word_swapped(st->client, cmd);
283}
284
285static int ad799x_read_raw(struct iio_dev *indio_dev,
286			   struct iio_chan_spec const *chan,
287			   int *val,
288			   int *val2,
289			   long m)
290{
291	int ret;
292	struct ad799x_state *st = iio_priv(indio_dev);
293
294	switch (m) {
295	case IIO_CHAN_INFO_RAW:
296		if (!iio_device_claim_direct(indio_dev))
297			return -EBUSY;
298		mutex_lock(&st->lock);
299		ret = ad799x_scan_direct(st, chan->scan_index);
300		mutex_unlock(&st->lock);
301		iio_device_release_direct(indio_dev);
302
303		if (ret < 0)
304			return ret;
305		*val = (ret >> chan->scan_type.shift) &
306			GENMASK(chan->scan_type.realbits - 1, 0);
307		return IIO_VAL_INT;
308	case IIO_CHAN_INFO_SCALE:
309		if (st->vref)
310			ret = regulator_get_voltage(st->vref);
311		else
312			ret = regulator_get_voltage(st->reg);
313
314		if (ret < 0)
315			return ret;
316		*val = ret / 1000;
317		*val2 = chan->scan_type.realbits;
318		return IIO_VAL_FRACTIONAL_LOG2;
319	}
320	return -EINVAL;
321}
322static const unsigned int ad7998_frequencies[] = {
323	[AD7998_CYC_DIS]	= 0,
324	[AD7998_CYC_TCONF_32]	= 15625,
325	[AD7998_CYC_TCONF_64]	= 7812,
326	[AD7998_CYC_TCONF_128]	= 3906,
327	[AD7998_CYC_TCONF_512]	= 976,
328	[AD7998_CYC_TCONF_1024]	= 488,
329	[AD7998_CYC_TCONF_2048]	= 244,
330};
331
332static ssize_t ad799x_read_frequency(struct device *dev,
333					struct device_attribute *attr,
334					char *buf)
335{
336	struct iio_dev *indio_dev = dev_to_iio_dev(dev);
337	struct ad799x_state *st = iio_priv(indio_dev);
338
339	int ret = i2c_smbus_read_byte_data(st->client, AD7998_CYCLE_TMR_REG);
340
341	if (ret < 0)
342		return ret;
343
344	return sprintf(buf, "%u\n", ad7998_frequencies[ret & AD7998_CYC_MASK]);
345}
346
347static ssize_t ad799x_write_frequency(struct device *dev,
348					 struct device_attribute *attr,
349					 const char *buf,
350					 size_t len)
351{
352	struct iio_dev *indio_dev = dev_to_iio_dev(dev);
353	struct ad799x_state *st = iio_priv(indio_dev);
354
355	long val;
356	int ret, i;
357
358	ret = kstrtol(buf, 10, &val);
359	if (ret)
360		return ret;
361
362	mutex_lock(&st->lock);
363
364	ret = i2c_smbus_read_byte_data(st->client, AD7998_CYCLE_TMR_REG);
365	if (ret < 0)
366		goto error_ret_mutex;
367	/* Wipe the bits clean */
368	ret &= ~AD7998_CYC_MASK;
369
370	for (i = 0; i < ARRAY_SIZE(ad7998_frequencies); i++)
371		if (val == ad7998_frequencies[i])
372			break;
373	if (i == ARRAY_SIZE(ad7998_frequencies)) {
374		ret = -EINVAL;
375		goto error_ret_mutex;
376	}
377
378	ret = i2c_smbus_write_byte_data(st->client, AD7998_CYCLE_TMR_REG,
379		ret | i);
380	if (ret < 0)
381		goto error_ret_mutex;
382	ret = len;
383
384error_ret_mutex:
385	mutex_unlock(&st->lock);
386
387	return ret;
388}
389
390static int ad799x_read_event_config(struct iio_dev *indio_dev,
391				    const struct iio_chan_spec *chan,
392				    enum iio_event_type type,
393				    enum iio_event_direction dir)
394{
395	struct ad799x_state *st = iio_priv(indio_dev);
396
397	if (!(st->config & AD7998_ALERT_EN))
398		return 0;
399
400	if ((st->config >> AD799X_CHANNEL_SHIFT) & BIT(chan->scan_index))
401		return 1;
402
403	return 0;
404}
405
406static int ad799x_write_event_config(struct iio_dev *indio_dev,
407				     const struct iio_chan_spec *chan,
408				     enum iio_event_type type,
409				     enum iio_event_direction dir,
410				     bool state)
411{
412	struct ad799x_state *st = iio_priv(indio_dev);
413	int ret;
414
415	if (!iio_device_claim_direct(indio_dev))
416		return -EBUSY;
417
418	mutex_lock(&st->lock);
419
420	if (state)
421		st->config |= BIT(chan->scan_index) << AD799X_CHANNEL_SHIFT;
422	else
423		st->config &= ~(BIT(chan->scan_index) << AD799X_CHANNEL_SHIFT);
424
425	if (st->config >> AD799X_CHANNEL_SHIFT)
426		st->config |= AD7998_ALERT_EN;
427	else
428		st->config &= ~AD7998_ALERT_EN;
429
430	ret = ad799x_write_config(st, st->config);
431	mutex_unlock(&st->lock);
432	iio_device_release_direct(indio_dev);
433	return ret;
434}
435
436static unsigned int ad799x_threshold_reg(const struct iio_chan_spec *chan,
437					 enum iio_event_direction dir,
438					 enum iio_event_info info)
439{
440	switch (info) {
441	case IIO_EV_INFO_VALUE:
442		if (dir == IIO_EV_DIR_FALLING)
443			return AD7998_DATALOW_REG(chan->channel);
444		else
445			return AD7998_DATAHIGH_REG(chan->channel);
446	case IIO_EV_INFO_HYSTERESIS:
447		return AD7998_HYST_REG(chan->channel);
448	default:
449		return -EINVAL;
450	}
451
452	return 0;
453}
454
455static int ad799x_write_event_value(struct iio_dev *indio_dev,
456				    const struct iio_chan_spec *chan,
457				    enum iio_event_type type,
458				    enum iio_event_direction dir,
459				    enum iio_event_info info,
460				    int val, int val2)
461{
462	int ret;
463	struct ad799x_state *st = iio_priv(indio_dev);
464
465	if (val < 0 || val > GENMASK(chan->scan_type.realbits - 1, 0))
466		return -EINVAL;
467
468	ret = i2c_smbus_write_word_swapped(st->client,
469		ad799x_threshold_reg(chan, dir, info),
470		val << chan->scan_type.shift);
471
472	return ret;
473}
474
475static int ad799x_read_event_value(struct iio_dev *indio_dev,
476				    const struct iio_chan_spec *chan,
477				    enum iio_event_type type,
478				    enum iio_event_direction dir,
479				    enum iio_event_info info,
480				    int *val, int *val2)
481{
482	int ret;
483	struct ad799x_state *st = iio_priv(indio_dev);
484
485	ret = i2c_smbus_read_word_swapped(st->client,
486		ad799x_threshold_reg(chan, dir, info));
487	if (ret < 0)
488		return ret;
489	*val = (ret >> chan->scan_type.shift) &
490		GENMASK(chan->scan_type.realbits - 1, 0);
491
492	return IIO_VAL_INT;
493}
494
495static irqreturn_t ad799x_event_handler(int irq, void *private)
496{
497	struct iio_dev *indio_dev = private;
498	struct ad799x_state *st = iio_priv(private);
499	int i, ret;
500
501	ret = i2c_smbus_read_byte_data(st->client, AD7998_ALERT_STAT_REG);
502	if (ret <= 0)
503		goto done;
504
505	if (i2c_smbus_write_byte_data(st->client, AD7998_ALERT_STAT_REG,
506		AD7998_ALERT_STAT_CLEAR) < 0)
507		goto done;
508
509	for (i = 0; i < 8; i++) {
510		if (ret & BIT(i))
511			iio_push_event(indio_dev,
512				       i & 0x1 ?
513				       IIO_UNMOD_EVENT_CODE(IIO_VOLTAGE,
514							    (i >> 1),
515							    IIO_EV_TYPE_THRESH,
516							    IIO_EV_DIR_RISING) :
517				       IIO_UNMOD_EVENT_CODE(IIO_VOLTAGE,
518							    (i >> 1),
519							    IIO_EV_TYPE_THRESH,
520							    IIO_EV_DIR_FALLING),
521				       iio_get_time_ns(indio_dev));
522	}
523
524done:
525	return IRQ_HANDLED;
526}
527
528static IIO_DEV_ATTR_SAMP_FREQ(0644,
529			      ad799x_read_frequency,
530			      ad799x_write_frequency);
531static IIO_CONST_ATTR_SAMP_FREQ_AVAIL("15625 7812 3906 1953 976 488 244 0");
532
533static struct attribute *ad799x_event_attributes[] = {
534	&iio_dev_attr_sampling_frequency.dev_attr.attr,
535	&iio_const_attr_sampling_frequency_available.dev_attr.attr,
536	NULL,
537};
538
539static const struct attribute_group ad799x_event_attrs_group = {
540	.attrs = ad799x_event_attributes,
541};
542
543static const struct iio_info ad7991_info = {
544	.read_raw = &ad799x_read_raw,
545	.update_scan_mode = ad799x_update_scan_mode,
546};
547
548static const struct iio_info ad7993_4_7_8_noirq_info = {
549	.read_raw = &ad799x_read_raw,
550	.update_scan_mode = ad799x_update_scan_mode,
551};
552
553static const struct iio_info ad7993_4_7_8_irq_info = {
554	.read_raw = &ad799x_read_raw,
555	.event_attrs = &ad799x_event_attrs_group,
556	.read_event_config = &ad799x_read_event_config,
557	.write_event_config = &ad799x_write_event_config,
558	.read_event_value = &ad799x_read_event_value,
559	.write_event_value = &ad799x_write_event_value,
560	.update_scan_mode = ad799x_update_scan_mode,
561};
562
563static const struct iio_event_spec ad799x_events[] = {
564	{
565		.type = IIO_EV_TYPE_THRESH,
566		.dir = IIO_EV_DIR_RISING,
567		.mask_separate = BIT(IIO_EV_INFO_VALUE) |
568			BIT(IIO_EV_INFO_ENABLE),
569	}, {
570		.type = IIO_EV_TYPE_THRESH,
571		.dir = IIO_EV_DIR_FALLING,
572		.mask_separate = BIT(IIO_EV_INFO_VALUE) |
573			BIT(IIO_EV_INFO_ENABLE),
574	}, {
575		.type = IIO_EV_TYPE_THRESH,
576		.dir = IIO_EV_DIR_EITHER,
577		.mask_separate = BIT(IIO_EV_INFO_HYSTERESIS),
578	},
579};
580
581#define _AD799X_CHANNEL(_index, _realbits, _ev_spec, _num_ev_spec) { \
582	.type = IIO_VOLTAGE, \
583	.indexed = 1, \
584	.channel = (_index), \
585	.info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \
586	.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE), \
587	.scan_index = (_index), \
588	.scan_type = { \
589		.sign = 'u', \
590		.realbits = (_realbits), \
591		.storagebits = 16, \
592		.shift = 12 - (_realbits), \
593		.endianness = IIO_BE, \
594	}, \
595	.event_spec = _ev_spec, \
596	.num_event_specs = _num_ev_spec, \
597}
598
599#define AD799X_CHANNEL(_index, _realbits) \
600	_AD799X_CHANNEL(_index, _realbits, NULL, 0)
601
602#define AD799X_CHANNEL_WITH_EVENTS(_index, _realbits) \
603	_AD799X_CHANNEL(_index, _realbits, ad799x_events, \
604		ARRAY_SIZE(ad799x_events))
605
606static const struct ad799x_chip_info ad799x_chip_info_tbl[] = {
607	[ad7991] = {
608		.num_channels = 5,
609		.has_vref = true,
610		.noirq_config = {
611			.channel = {
612				AD799X_CHANNEL(0, 12),
613				AD799X_CHANNEL(1, 12),
614				AD799X_CHANNEL(2, 12),
615				AD799X_CHANNEL(3, 12),
616				IIO_CHAN_SOFT_TIMESTAMP(4),
617			},
618			.info = &ad7991_info,
619		},
620	},
621	[ad7995] = {
622		.num_channels = 5,
623		.has_vref = true,
624		.noirq_config = {
625			.channel = {
626				AD799X_CHANNEL(0, 10),
627				AD799X_CHANNEL(1, 10),
628				AD799X_CHANNEL(2, 10),
629				AD799X_CHANNEL(3, 10),
630				IIO_CHAN_SOFT_TIMESTAMP(4),
631			},
632			.info = &ad7991_info,
633		},
634	},
635	[ad7999] = {
636		.num_channels = 5,
637		.has_vref = true,
638		.noirq_config = {
639			.channel = {
640				AD799X_CHANNEL(0, 8),
641				AD799X_CHANNEL(1, 8),
642				AD799X_CHANNEL(2, 8),
643				AD799X_CHANNEL(3, 8),
644				IIO_CHAN_SOFT_TIMESTAMP(4),
645			},
646			.info = &ad7991_info,
647		},
648	},
649	[ad7992] = {
650		.num_channels = 3,
651		.noirq_config = {
652			.channel = {
653				AD799X_CHANNEL(0, 12),
654				AD799X_CHANNEL(1, 12),
655				IIO_CHAN_SOFT_TIMESTAMP(3),
656			},
657			.info = &ad7993_4_7_8_noirq_info,
658		},
659		.irq_config = {
660			.channel = {
661				AD799X_CHANNEL_WITH_EVENTS(0, 12),
662				AD799X_CHANNEL_WITH_EVENTS(1, 12),
663				IIO_CHAN_SOFT_TIMESTAMP(3),
664			},
665			.default_config = AD7998_ALERT_EN | AD7998_BUSY_ALERT,
666			.info = &ad7993_4_7_8_irq_info,
667		},
668	},
669	[ad7993] = {
670		.num_channels = 5,
671		.noirq_config = {
672			.channel = {
673				AD799X_CHANNEL(0, 10),
674				AD799X_CHANNEL(1, 10),
675				AD799X_CHANNEL(2, 10),
676				AD799X_CHANNEL(3, 10),
677				IIO_CHAN_SOFT_TIMESTAMP(4),
678			},
679			.info = &ad7993_4_7_8_noirq_info,
680		},
681		.irq_config = {
682			.channel = {
683				AD799X_CHANNEL_WITH_EVENTS(0, 10),
684				AD799X_CHANNEL_WITH_EVENTS(1, 10),
685				AD799X_CHANNEL_WITH_EVENTS(2, 10),
686				AD799X_CHANNEL_WITH_EVENTS(3, 10),
687				IIO_CHAN_SOFT_TIMESTAMP(4),
688			},
689			.default_config = AD7998_ALERT_EN | AD7998_BUSY_ALERT,
690			.info = &ad7993_4_7_8_irq_info,
691		},
692	},
693	[ad7994] = {
694		.num_channels = 5,
695		.has_vref = true,
696		.noirq_config = {
697			.channel = {
698				AD799X_CHANNEL(0, 12),
699				AD799X_CHANNEL(1, 12),
700				AD799X_CHANNEL(2, 12),
701				AD799X_CHANNEL(3, 12),
702				IIO_CHAN_SOFT_TIMESTAMP(4),
703			},
704			.info = &ad7993_4_7_8_noirq_info,
705		},
706		.irq_config = {
707			.channel = {
708				AD799X_CHANNEL_WITH_EVENTS(0, 12),
709				AD799X_CHANNEL_WITH_EVENTS(1, 12),
710				AD799X_CHANNEL_WITH_EVENTS(2, 12),
711				AD799X_CHANNEL_WITH_EVENTS(3, 12),
712				IIO_CHAN_SOFT_TIMESTAMP(4),
713			},
714			.default_config = AD7998_ALERT_EN | AD7998_BUSY_ALERT,
715			.info = &ad7993_4_7_8_irq_info,
716		},
717	},
718	[ad7997] = {
719		.num_channels = 9,
720		.noirq_config = {
721			.channel = {
722				AD799X_CHANNEL(0, 10),
723				AD799X_CHANNEL(1, 10),
724				AD799X_CHANNEL(2, 10),
725				AD799X_CHANNEL(3, 10),
726				AD799X_CHANNEL(4, 10),
727				AD799X_CHANNEL(5, 10),
728				AD799X_CHANNEL(6, 10),
729				AD799X_CHANNEL(7, 10),
730				IIO_CHAN_SOFT_TIMESTAMP(8),
731			},
732			.info = &ad7993_4_7_8_noirq_info,
733		},
734		.irq_config = {
735			.channel = {
736				AD799X_CHANNEL_WITH_EVENTS(0, 10),
737				AD799X_CHANNEL_WITH_EVENTS(1, 10),
738				AD799X_CHANNEL_WITH_EVENTS(2, 10),
739				AD799X_CHANNEL_WITH_EVENTS(3, 10),
740				AD799X_CHANNEL(4, 10),
741				AD799X_CHANNEL(5, 10),
742				AD799X_CHANNEL(6, 10),
743				AD799X_CHANNEL(7, 10),
744				IIO_CHAN_SOFT_TIMESTAMP(8),
745			},
746			.default_config = AD7998_ALERT_EN | AD7998_BUSY_ALERT,
747			.info = &ad7993_4_7_8_irq_info,
748		},
749	},
750	[ad7998] = {
751		.num_channels = 9,
752		.noirq_config = {
753			.channel = {
754				AD799X_CHANNEL(0, 12),
755				AD799X_CHANNEL(1, 12),
756				AD799X_CHANNEL(2, 12),
757				AD799X_CHANNEL(3, 12),
758				AD799X_CHANNEL(4, 12),
759				AD799X_CHANNEL(5, 12),
760				AD799X_CHANNEL(6, 12),
761				AD799X_CHANNEL(7, 12),
762				IIO_CHAN_SOFT_TIMESTAMP(8),
763			},
764			.info = &ad7993_4_7_8_noirq_info,
765		},
766		.irq_config = {
767			.channel = {
768				AD799X_CHANNEL_WITH_EVENTS(0, 12),
769				AD799X_CHANNEL_WITH_EVENTS(1, 12),
770				AD799X_CHANNEL_WITH_EVENTS(2, 12),
771				AD799X_CHANNEL_WITH_EVENTS(3, 12),
772				AD799X_CHANNEL(4, 12),
773				AD799X_CHANNEL(5, 12),
774				AD799X_CHANNEL(6, 12),
775				AD799X_CHANNEL(7, 12),
776				IIO_CHAN_SOFT_TIMESTAMP(8),
777			},
778			.default_config = AD7998_ALERT_EN | AD7998_BUSY_ALERT,
779			.info = &ad7993_4_7_8_irq_info,
780		},
781	},
782};
783
784static int ad799x_probe(struct i2c_client *client)
785{
786	const struct i2c_device_id *id = i2c_client_get_device_id(client);
787	int ret;
788	int extra_config = 0;
789	struct ad799x_state *st;
790	struct iio_dev *indio_dev;
791	const struct ad799x_chip_info *chip_info =
792		&ad799x_chip_info_tbl[id->driver_data];
793
794	indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*st));
795	if (indio_dev == NULL)
796		return -ENOMEM;
797
798	st = iio_priv(indio_dev);
799	/* this is only used for device removal purposes */
800	i2c_set_clientdata(client, indio_dev);
801
802	st->id = id->driver_data;
803	if (client->irq > 0 && chip_info->irq_config.info)
804		st->chip_config = &chip_info->irq_config;
805	else
806		st->chip_config = &chip_info->noirq_config;
807
808	/* TODO: Add pdata options for filtering and bit delay */
809
810	st->reg = devm_regulator_get(&client->dev, "vcc");
811	if (IS_ERR(st->reg))
812		return PTR_ERR(st->reg);
813	ret = regulator_enable(st->reg);
814	if (ret)
815		return ret;
816
817	/* check if an external reference is supplied */
818	if (chip_info->has_vref) {
819		st->vref = devm_regulator_get_optional(&client->dev, "vref");
820		ret = PTR_ERR_OR_ZERO(st->vref);
821		if (ret) {
822			if (ret != -ENODEV)
823				goto error_disable_reg;
824			st->vref = NULL;
825			dev_info(&client->dev, "Using VCC reference voltage\n");
826		}
827
828		if (st->vref) {
829			dev_info(&client->dev, "Using external reference voltage\n");
830			extra_config |= AD7991_REF_SEL;
831			ret = regulator_enable(st->vref);
832			if (ret)
833				goto error_disable_reg;
834		}
835	}
836
837	st->client = client;
838
839	indio_dev->name = id->name;
840	indio_dev->info = st->chip_config->info;
841
842	indio_dev->modes = INDIO_DIRECT_MODE;
843	indio_dev->channels = st->chip_config->channel;
844	indio_dev->num_channels = chip_info->num_channels;
845
846	ret = ad799x_update_config(st, st->chip_config->default_config | extra_config);
847	if (ret)
848		goto error_disable_vref;
849
850	ret = iio_triggered_buffer_setup(indio_dev, NULL,
851		&ad799x_trigger_handler, NULL);
852	if (ret)
853		goto error_disable_vref;
854
855	if (client->irq > 0) {
856		ret = devm_request_threaded_irq(&client->dev,
857						client->irq,
858						NULL,
859						ad799x_event_handler,
860						IRQF_TRIGGER_FALLING |
861						IRQF_ONESHOT,
862						client->name,
863						indio_dev);
864		if (ret)
865			goto error_cleanup_ring;
866	}
867
868	mutex_init(&st->lock);
869
870	ret = iio_device_register(indio_dev);
871	if (ret)
872		goto error_cleanup_ring;
873
874	return 0;
875
876error_cleanup_ring:
877	iio_triggered_buffer_cleanup(indio_dev);
878error_disable_vref:
879	if (st->vref)
880		regulator_disable(st->vref);
881error_disable_reg:
882	regulator_disable(st->reg);
883
884	return ret;
885}
886
887static void ad799x_remove(struct i2c_client *client)
888{
889	struct iio_dev *indio_dev = i2c_get_clientdata(client);
890	struct ad799x_state *st = iio_priv(indio_dev);
891
892	iio_device_unregister(indio_dev);
893
894	iio_triggered_buffer_cleanup(indio_dev);
895	if (st->vref)
896		regulator_disable(st->vref);
897	regulator_disable(st->reg);
898	kfree(st->rx_buf);
899}
900
901static int ad799x_suspend(struct device *dev)
902{
903	struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
904	struct ad799x_state *st = iio_priv(indio_dev);
905
906	if (st->vref)
907		regulator_disable(st->vref);
908	regulator_disable(st->reg);
909
910	return 0;
911}
912
913static int ad799x_resume(struct device *dev)
914{
915	struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
916	struct ad799x_state *st = iio_priv(indio_dev);
917	int ret;
918
919	ret = regulator_enable(st->reg);
920	if (ret) {
921		dev_err(dev, "Unable to enable vcc regulator\n");
922		return ret;
923	}
924
925	if (st->vref) {
926		ret = regulator_enable(st->vref);
927		if (ret) {
928			regulator_disable(st->reg);
929			dev_err(dev, "Unable to enable vref regulator\n");
930			return ret;
931		}
932	}
933
934	/* resync config */
935	ret = ad799x_update_config(st, st->config);
936	if (ret) {
937		if (st->vref)
938			regulator_disable(st->vref);
939		regulator_disable(st->reg);
940		return ret;
941	}
942
943	return 0;
944}
945
946static DEFINE_SIMPLE_DEV_PM_OPS(ad799x_pm_ops, ad799x_suspend, ad799x_resume);
947
948static const struct i2c_device_id ad799x_id[] = {
949	{ "ad7991", ad7991 },
950	{ "ad7995", ad7995 },
951	{ "ad7999", ad7999 },
952	{ "ad7992", ad7992 },
953	{ "ad7993", ad7993 },
954	{ "ad7994", ad7994 },
955	{ "ad7997", ad7997 },
956	{ "ad7998", ad7998 },
957	{ }
958};
959
960MODULE_DEVICE_TABLE(i2c, ad799x_id);
961
962static struct i2c_driver ad799x_driver = {
963	.driver = {
964		.name = "ad799x",
965		.pm = pm_sleep_ptr(&ad799x_pm_ops),
966	},
967	.probe = ad799x_probe,
968	.remove = ad799x_remove,
969	.id_table = ad799x_id,
970};
971module_i2c_driver(ad799x_driver);
972
973MODULE_AUTHOR("Michael Hennerich <michael.hennerich@analog.com>");
974MODULE_DESCRIPTION("Analog Devices AD799x ADC");
975MODULE_LICENSE("GPL v2");