summaryrefslogtreecommitdiff
path: root/drivers/iio/adc/ad799x.c
blob: b6163764489c677a2ec45dd5536464734ac641c6 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
/*
 * iio/adc/ad799x.c
 * Copyright (C) 2010-2011 Michael Hennerich, Analog Devices Inc.
 *
 * based on iio/adc/max1363
 * Copyright (C) 2008-2010 Jonathan Cameron
 *
 * based on linux/drivers/i2c/chips/max123x
 * Copyright (C) 2002-2004 Stefan Eletzhofer
 *
 * based on linux/drivers/acron/char/pcf8583.c
 * Copyright (C) 2000 Russell King
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 *
 * ad799x.c
 *
 * Support for ad7991, ad7995, ad7999, ad7992, ad7993, ad7994, ad7997,
 * ad7998 and similar chips.
 *
 */

#include <linux/interrupt.h>
#include <linux/device.h>
#include <linux/kernel.h>
#include <linux/sysfs.h>
#include <linux/i2c.h>
#include <linux/regulator/consumer.h>
#include <linux/slab.h>
#include <linux/types.h>
#include <linux/err.h>
#include <linux/module.h>
#include <linux/bitops.h>

#include <linux/iio/iio.h>
#include <linux/iio/sysfs.h>
#include <linux/iio/events.h>
#include <linux/iio/buffer.h>
#include <linux/iio/trigger_consumer.h>
#include <linux/iio/triggered_buffer.h>

#define AD799X_CHANNEL_SHIFT			4

/*
 * AD7991, AD7995 and AD7999 defines
 */

#define AD7991_REF_SEL				0x08
#define AD7991_FLTR				0x04
#define AD7991_BIT_TRIAL_DELAY			0x02
#define AD7991_SAMPLE_DELAY			0x01

/*
 * AD7992, AD7993, AD7994, AD7997 and AD7998 defines
 */

#define AD7998_FLTR				BIT(3)
#define AD7998_ALERT_EN				BIT(2)
#define AD7998_BUSY_ALERT			BIT(1)
#define AD7998_BUSY_ALERT_POL			BIT(0)

#define AD7998_CONV_RES_REG			0x0
#define AD7998_ALERT_STAT_REG			0x1
#define AD7998_CONF_REG				0x2
#define AD7998_CYCLE_TMR_REG			0x3

#define AD7998_DATALOW_REG(x)			((x) * 3 + 0x4)
#define AD7998_DATAHIGH_REG(x)			((x) * 3 + 0x5)
#define AD7998_HYST_REG(x)			((x) * 3 + 0x6)

#define AD7998_CYC_MASK				GENMASK(2, 0)
#define AD7998_CYC_DIS				0x0
#define AD7998_CYC_TCONF_32			0x1
#define AD7998_CYC_TCONF_64			0x2
#define AD7998_CYC_TCONF_128			0x3
#define AD7998_CYC_TCONF_256			0x4
#define AD7998_CYC_TCONF_512			0x5
#define AD7998_CYC_TCONF_1024			0x6
#define AD7998_CYC_TCONF_2048			0x7

#define AD7998_ALERT_STAT_CLEAR			0xFF

/*
 * AD7997 and AD7997 defines
 */

#define AD7997_8_READ_SINGLE			BIT(7)
#define AD7997_8_READ_SEQUENCE			(BIT(6) | BIT(5) | BIT(4))

enum {
	ad7991,
	ad7995,
	ad7999,
	ad7992,
	ad7993,
	ad7994,
	ad7997,
	ad7998
};

/**
 * struct ad799x_chip_config - chip specific information
 * @channel:		channel specification
 * @default_config:	device default configuration
 * @info:		pointer to iio_info struct
 */
struct ad799x_chip_config {
	const struct iio_chan_spec	channel[9];
	u16				default_config;
	const struct iio_info		*info;
};

/**
 * struct ad799x_chip_info - chip specific information
 * @num_channels:	number of channels
 * @noirq_config:	device configuration w/o IRQ
 * @irq_config:		device configuration w/IRQ
 */
struct ad799x_chip_info {
	int				num_channels;
	const struct ad799x_chip_config	noirq_config;
	const struct ad799x_chip_config	irq_config;
};

struct ad799x_state {
	struct i2c_client		*client;
	const struct ad799x_chip_config	*chip_config;
	struct regulator		*reg;
	struct regulator		*vref;
	unsigned			id;
	u16				config;

	u8				*rx_buf;
	unsigned int			transfer_size;
};

static int ad799x_write_config(struct ad799x_state *st, u16 val)
{
	switch (st->id) {
	case ad7997:
	case ad7998:
		return i2c_smbus_write_word_swapped(st->client, AD7998_CONF_REG,
			val);
	case ad7992:
	case ad7993:
	case ad7994:
		return i2c_smbus_write_byte_data(st->client, AD7998_CONF_REG,
			val);
	default:
		/* Will be written when doing a conversion */
		st->config = val;
		return 0;
	}
}

static int ad799x_read_config(struct ad799x_state *st)
{
	switch (st->id) {
	case ad7997:
	case ad7998:
		return i2c_smbus_read_word_swapped(st->client, AD7998_CONF_REG);
	case ad7992:
	case ad7993:
	case ad7994:
		return i2c_smbus_read_byte_data(st->client, AD7998_CONF_REG);
	default:
		/* No readback support */
		return st->config;
	}
}

/**
 * ad799x_trigger_handler() bh of trigger launched polling to ring buffer
 *
 * Currently there is no option in this driver to disable the saving of
 * timestamps within the ring.
 **/
static irqreturn_t ad799x_trigger_handler(int irq, void *p)
{
	struct iio_poll_func *pf = p;
	struct iio_dev *indio_dev = pf->indio_dev;
	struct ad799x_state *st = iio_priv(indio_dev);
	int b_sent;
	u8 cmd;

	switch (st->id) {
	case ad7991:
	case ad7995:
	case ad7999:
		cmd = st->config |
			(*indio_dev->active_scan_mask << AD799X_CHANNEL_SHIFT);
		break;
	case ad7992:
	case ad7993:
	case ad7994:
		cmd = (*indio_dev->active_scan_mask << AD799X_CHANNEL_SHIFT) |
			AD7998_CONV_RES_REG;
		break;
	case ad7997:
	case ad7998:
		cmd = AD7997_8_READ_SEQUENCE | AD7998_CONV_RES_REG;
		break;
	default:
		cmd = 0;
	}

	b_sent = i2c_smbus_read_i2c_block_data(st->client,
			cmd, st->transfer_size, st->rx_buf);
	if (b_sent < 0)
		goto out;

	iio_push_to_buffers_with_timestamp(indio_dev, st->rx_buf,
			iio_get_time_ns(indio_dev));
out:
	iio_trigger_notify_done(indio_dev->trig);

	return IRQ_HANDLED;
}

static int ad799x_update_scan_mode(struct iio_dev *indio_dev,
	const unsigned long *scan_mask)
{
	struct ad799x_state *st = iio_priv(indio_dev);

	kfree(st->rx_buf);
	st->rx_buf = kmalloc(indio_dev->scan_bytes, GFP_KERNEL);
	if (!st->rx_buf)
		return -ENOMEM;

	st->transfer_size = bitmap_weight(scan_mask, indio_dev->masklength) * 2;

	switch (st->id) {
	case ad7992:
	case ad7993:
	case ad7994:
	case ad7997:
	case ad7998:
		st->config &= ~(GENMASK(7, 0) << AD799X_CHANNEL_SHIFT);
		st->config |= (*scan_mask << AD799X_CHANNEL_SHIFT);
		return ad799x_write_config(st, st->config);
	default:
		return 0;
	}
}

static int ad799x_scan_direct(struct ad799x_state *st, unsigned ch)
{
	u8 cmd;

	switch (st->id) {
	case ad7991:
	case ad7995:
	case ad7999:
		cmd = st->config | (BIT(ch) << AD799X_CHANNEL_SHIFT);
		break;
	case ad7992:
	case ad7993:
	case ad7994:
		cmd = BIT(ch) << AD799X_CHANNEL_SHIFT;
		break;
	case ad7997:
	case ad7998:
		cmd = (ch << AD799X_CHANNEL_SHIFT) | AD7997_8_READ_SINGLE;
		break;
	default:
		return -EINVAL;
	}

	return i2c_smbus_read_word_swapped(st->client, cmd);
}

static int ad799x_read_raw(struct iio_dev *indio_dev,
			   struct iio_chan_spec const *chan,
			   int *val,
			   int *val2,
			   long m)
{
	int ret;
	struct ad799x_state *st = iio_priv(indio_dev);

	switch (m) {
	case IIO_CHAN_INFO_RAW:
		ret = iio_device_claim_direct_mode(indio_dev);
		if (ret)
			return ret;
		ret = ad799x_scan_direct(st, chan->scan_index);
		iio_device_release_direct_mode(indio_dev);

		if (ret < 0)
			return ret;
		*val = (ret >> chan->scan_type.shift) &
			GENMASK(chan->scan_type.realbits - 1, 0);
		return IIO_VAL_INT;
	case IIO_CHAN_INFO_SCALE:
		ret = regulator_get_voltage(st->vref);
		if (ret < 0)
			return ret;
		*val = ret / 1000;
		*val2 = chan->scan_type.realbits;
		return IIO_VAL_FRACTIONAL_LOG2;
	}
	return -EINVAL;
}
static const unsigned int ad7998_frequencies[] = {
	[AD7998_CYC_DIS]	= 0,
	[AD7998_CYC_TCONF_32]	= 15625,
	[AD7998_CYC_TCONF_64]	= 7812,
	[AD7998_CYC_TCONF_128]	= 3906,
	[AD7998_CYC_TCONF_512]	= 976,
	[AD7998_CYC_TCONF_1024]	= 488,
	[AD7998_CYC_TCONF_2048]	= 244,
};

static ssize_t ad799x_read_frequency(struct device *dev,
					struct device_attribute *attr,
					char *buf)
{
	struct iio_dev *indio_dev = dev_to_iio_dev(dev);
	struct ad799x_state *st = iio_priv(indio_dev);

	int ret = i2c_smbus_read_byte_data(st->client, AD7998_CYCLE_TMR_REG);
	if (ret < 0)
		return ret;

	return sprintf(buf, "%u\n", ad7998_frequencies[ret & AD7998_CYC_MASK]);
}

static ssize_t ad799x_write_frequency(struct device *dev,
					 struct device_attribute *attr,
					 const char *buf,
					 size_t len)
{
	struct iio_dev *indio_dev = dev_to_iio_dev(dev);
	struct ad799x_state *st = iio_priv(indio_dev);

	long val;
	int ret, i;

	ret = kstrtol(buf, 10, &val);
	if (ret)
		return ret;

	mutex_lock(&indio_dev->mlock);
	ret = i2c_smbus_read_byte_data(st->client, AD7998_CYCLE_TMR_REG);
	if (ret < 0)
		goto error_ret_mutex;
	/* Wipe the bits clean */
	ret &= ~AD7998_CYC_MASK;

	for (i = 0; i < ARRAY_SIZE(ad7998_frequencies); i++)
		if (val == ad7998_frequencies[i])
			break;
	if (i == ARRAY_SIZE(ad7998_frequencies)) {
		ret = -EINVAL;
		goto error_ret_mutex;
	}

	ret = i2c_smbus_write_byte_data(st->client, AD7998_CYCLE_TMR_REG,
		ret | i);
	if (ret < 0)
		goto error_ret_mutex;
	ret = len;

error_ret_mutex:
	mutex_unlock(&indio_dev->mlock);

	return ret;
}

static int ad799x_read_event_config(struct iio_dev *indio_dev,
				    const struct iio_chan_spec *chan,
				    enum iio_event_type type,
				    enum iio_event_direction dir)
{
	struct ad799x_state *st = iio_priv(indio_dev);

	if (!(st->config & AD7998_ALERT_EN))
		return 0;

	if ((st->config >> AD799X_CHANNEL_SHIFT) & BIT(chan->scan_index))
		return 1;

	return 0;
}

static int ad799x_write_event_config(struct iio_dev *indio_dev,
				     const struct iio_chan_spec *chan,
				     enum iio_event_type type,
				     enum iio_event_direction dir,
				     int state)
{
	struct ad799x_state *st = iio_priv(indio_dev);
	int ret;

	ret = iio_device_claim_direct_mode(indio_dev);
	if (ret)
		return ret;

	if (state)
		st->config |= BIT(chan->scan_index) << AD799X_CHANNEL_SHIFT;
	else
		st->config &= ~(BIT(chan->scan_index) << AD799X_CHANNEL_SHIFT);

	if (st->config >> AD799X_CHANNEL_SHIFT)
		st->config |= AD7998_ALERT_EN;
	else
		st->config &= ~AD7998_ALERT_EN;

	ret = ad799x_write_config(st, st->config);
	iio_device_release_direct_mode(indio_dev);
	return ret;
}

static unsigned int ad799x_threshold_reg(const struct iio_chan_spec *chan,
					 enum iio_event_direction dir,
					 enum iio_event_info info)
{
	switch (info) {
	case IIO_EV_INFO_VALUE:
		if (dir == IIO_EV_DIR_FALLING)
			return AD7998_DATALOW_REG(chan->channel);
		else
			return AD7998_DATAHIGH_REG(chan->channel);
	case IIO_EV_INFO_HYSTERESIS:
		return AD7998_HYST_REG(chan->channel);
	default:
		return -EINVAL;
	}

	return 0;
}

static int ad799x_write_event_value(struct iio_dev *indio_dev,
				    const struct iio_chan_spec *chan,
				    enum iio_event_type type,
				    enum iio_event_direction dir,
				    enum iio_event_info info,
				    int val, int val2)
{
	int ret;
	struct ad799x_state *st = iio_priv(indio_dev);

	if (val < 0 || val > GENMASK(chan->scan_type.realbits - 1, 0))
		return -EINVAL;

	mutex_lock(&indio_dev->mlock);
	ret = i2c_smbus_write_word_swapped(st->client,
		ad799x_threshold_reg(chan, dir, info),
		val << chan->scan_type.shift);
	mutex_unlock(&indio_dev->mlock);

	return ret;
}

static int ad799x_read_event_value(struct iio_dev *indio_dev,
				    const struct iio_chan_spec *chan,
				    enum iio_event_type type,
				    enum iio_event_direction dir,
				    enum iio_event_info info,
				    int *val, int *val2)
{
	int ret;
	struct ad799x_state *st = iio_priv(indio_dev);

	mutex_lock(&indio_dev->mlock);
	ret = i2c_smbus_read_word_swapped(st->client,
		ad799x_threshold_reg(chan, dir, info));
	mutex_unlock(&indio_dev->mlock);
	if (ret < 0)
		return ret;
	*val = (ret >> chan->scan_type.shift) &
		GENMASK(chan->scan_type.realbits - 1, 0);

	return IIO_VAL_INT;
}

static irqreturn_t ad799x_event_handler(int irq, void *private)
{
	struct iio_dev *indio_dev = private;
	struct ad799x_state *st = iio_priv(private);
	int i, ret;

	ret = i2c_smbus_read_byte_data(st->client, AD7998_ALERT_STAT_REG);
	if (ret <= 0)
		goto done;

	if (i2c_smbus_write_byte_data(st->client, AD7998_ALERT_STAT_REG,
		AD7998_ALERT_STAT_CLEAR) < 0)
		goto done;

	for (i = 0; i < 8; i++) {
		if (ret & BIT(i))
			iio_push_event(indio_dev,
				       i & 0x1 ?
				       IIO_UNMOD_EVENT_CODE(IIO_VOLTAGE,
							    (i >> 1),
							    IIO_EV_TYPE_THRESH,
							    IIO_EV_DIR_RISING) :
				       IIO_UNMOD_EVENT_CODE(IIO_VOLTAGE,
							    (i >> 1),
							    IIO_EV_TYPE_THRESH,
							    IIO_EV_DIR_FALLING),
				       iio_get_time_ns(indio_dev));
	}

done:
	return IRQ_HANDLED;
}

static IIO_DEV_ATTR_SAMP_FREQ(S_IWUSR | S_IRUGO,
			      ad799x_read_frequency,
			      ad799x_write_frequency);
static IIO_CONST_ATTR_SAMP_FREQ_AVAIL("15625 7812 3906 1953 976 488 244 0");

static struct attribute *ad799x_event_attributes[] = {
	&iio_dev_attr_sampling_frequency.dev_attr.attr,
	&iio_const_attr_sampling_frequency_available.dev_attr.attr,
	NULL,
};

static struct attribute_group ad799x_event_attrs_group = {
	.attrs = ad799x_event_attributes,
};

static const struct iio_info ad7991_info = {
	.read_raw = &ad799x_read_raw,
	.driver_module = THIS_MODULE,
};

static const struct iio_info ad7993_4_7_8_noirq_info = {
	.read_raw = &ad799x_read_raw,
	.driver_module = THIS_MODULE,
	.update_scan_mode = ad799x_update_scan_mode,
};

static const struct iio_info ad7993_4_7_8_irq_info = {
	.read_raw = &ad799x_read_raw,
	.event_attrs = &ad799x_event_attrs_group,
	.read_event_config = &ad799x_read_event_config,
	.write_event_config = &ad799x_write_event_config,
	.read_event_value = &ad799x_read_event_value,
	.write_event_value = &ad799x_write_event_value,
	.driver_module = THIS_MODULE,
	.update_scan_mode = ad799x_update_scan_mode,
};

static const struct iio_event_spec ad799x_events[] = {
	{
		.type = IIO_EV_TYPE_THRESH,
		.dir = IIO_EV_DIR_RISING,
		.mask_separate = BIT(IIO_EV_INFO_VALUE) |
			BIT(IIO_EV_INFO_ENABLE),
	}, {
		.type = IIO_EV_TYPE_THRESH,
		.dir = IIO_EV_DIR_FALLING,
		.mask_separate = BIT(IIO_EV_INFO_VALUE) |
			BIT(IIO_EV_INFO_ENABLE),
	}, {
		.type = IIO_EV_TYPE_THRESH,
		.dir = IIO_EV_DIR_EITHER,
		.mask_separate = BIT(IIO_EV_INFO_HYSTERESIS),
	},
};

#define _AD799X_CHANNEL(_index, _realbits, _ev_spec, _num_ev_spec) { \
	.type = IIO_VOLTAGE, \
	.indexed = 1, \
	.channel = (_index), \
	.info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \
	.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE), \
	.scan_index = (_index), \
	.scan_type = { \
		.sign = 'u', \
		.realbits = (_realbits), \
		.storagebits = 16, \
		.shift = 12 - (_realbits), \
		.endianness = IIO_BE, \
	}, \
	.event_spec = _ev_spec, \
	.num_event_specs = _num_ev_spec, \
}

#define AD799X_CHANNEL(_index, _realbits) \
	_AD799X_CHANNEL(_index, _realbits, NULL, 0)

#define AD799X_CHANNEL_WITH_EVENTS(_index, _realbits) \
	_AD799X_CHANNEL(_index, _realbits, ad799x_events, \
		ARRAY_SIZE(ad799x_events))

static const struct ad799x_chip_info ad799x_chip_info_tbl[] = {
	[ad7991] = {
		.num_channels = 5,
		.noirq_config = {
			.channel = {
				AD799X_CHANNEL(0, 12),
				AD799X_CHANNEL(1, 12),
				AD799X_CHANNEL(2, 12),
				AD799X_CHANNEL(3, 12),
				IIO_CHAN_SOFT_TIMESTAMP(4),
			},
			.info = &ad7991_info,
		},
	},
	[ad7995] = {
		.num_channels = 5,
		.noirq_config = {
			.channel = {
				AD799X_CHANNEL(0, 10),
				AD799X_CHANNEL(1, 10),
				AD799X_CHANNEL(2, 10),
				AD799X_CHANNEL(3, 10),
				IIO_CHAN_SOFT_TIMESTAMP(4),
			},
			.info = &ad7991_info,
		},
	},
	[ad7999] = {
		.num_channels = 5,
		.noirq_config = {
			.channel = {
				AD799X_CHANNEL(0, 8),
				AD799X_CHANNEL(1, 8),
				AD799X_CHANNEL(2, 8),
				AD799X_CHANNEL(3, 8),
				IIO_CHAN_SOFT_TIMESTAMP(4),
			},
			.info = &ad7991_info,
		},
	},
	[ad7992] = {
		.num_channels = 3,
		.noirq_config = {
			.channel = {
				AD799X_CHANNEL(0, 12),
				AD799X_CHANNEL(1, 12),
				IIO_CHAN_SOFT_TIMESTAMP(3),
			},
			.info = &ad7993_4_7_8_noirq_info,
		},
		.irq_config = {
			.channel = {
				AD799X_CHANNEL_WITH_EVENTS(0, 12),
				AD799X_CHANNEL_WITH_EVENTS(1, 12),
				IIO_CHAN_SOFT_TIMESTAMP(3),
			},
			.default_config = AD7998_ALERT_EN | AD7998_BUSY_ALERT,
			.info = &ad7993_4_7_8_irq_info,
		},
	},
	[ad7993] = {
		.num_channels = 5,
		.noirq_config = {
			.channel = {
				AD799X_CHANNEL(0, 10),
				AD799X_CHANNEL(1, 10),
				AD799X_CHANNEL(2, 10),
				AD799X_CHANNEL(3, 10),
				IIO_CHAN_SOFT_TIMESTAMP(4),
			},
			.info = &ad7993_4_7_8_noirq_info,
		},
		.irq_config = {
			.channel = {
				AD799X_CHANNEL_WITH_EVENTS(0, 10),
				AD799X_CHANNEL_WITH_EVENTS(1, 10),
				AD799X_CHANNEL_WITH_EVENTS(2, 10),
				AD799X_CHANNEL_WITH_EVENTS(3, 10),
				IIO_CHAN_SOFT_TIMESTAMP(4),
			},
			.default_config = AD7998_ALERT_EN | AD7998_BUSY_ALERT,
			.info = &ad7993_4_7_8_irq_info,
		},
	},
	[ad7994] = {
		.num_channels = 5,
		.noirq_config = {
			.channel = {
				AD799X_CHANNEL(0, 12),
				AD799X_CHANNEL(1, 12),
				AD799X_CHANNEL(2, 12),
				AD799X_CHANNEL(3, 12),
				IIO_CHAN_SOFT_TIMESTAMP(4),
			},
			.info = &ad7993_4_7_8_noirq_info,
		},
		.irq_config = {
			.channel = {
				AD799X_CHANNEL_WITH_EVENTS(0, 12),
				AD799X_CHANNEL_WITH_EVENTS(1, 12),
				AD799X_CHANNEL_WITH_EVENTS(2, 12),
				AD799X_CHANNEL_WITH_EVENTS(3, 12),
				IIO_CHAN_SOFT_TIMESTAMP(4),
			},
			.default_config = AD7998_ALERT_EN | AD7998_BUSY_ALERT,
			.info = &ad7993_4_7_8_irq_info,
		},
	},
	[ad7997] = {
		.num_channels = 9,
		.noirq_config = {
			.channel = {
				AD799X_CHANNEL(0, 10),
				AD799X_CHANNEL(1, 10),
				AD799X_CHANNEL(2, 10),
				AD799X_CHANNEL(3, 10),
				AD799X_CHANNEL(4, 10),
				AD799X_CHANNEL(5, 10),
				AD799X_CHANNEL(6, 10),
				AD799X_CHANNEL(7, 10),
				IIO_CHAN_SOFT_TIMESTAMP(8),
			},
			.info = &ad7993_4_7_8_noirq_info,
		},
		.irq_config = {
			.channel = {
				AD799X_CHANNEL_WITH_EVENTS(0, 10),
				AD799X_CHANNEL_WITH_EVENTS(1, 10),
				AD799X_CHANNEL_WITH_EVENTS(2, 10),
				AD799X_CHANNEL_WITH_EVENTS(3, 10),
				AD799X_CHANNEL(4, 10),
				AD799X_CHANNEL(5, 10),
				AD799X_CHANNEL(6, 10),
				AD799X_CHANNEL(7, 10),
				IIO_CHAN_SOFT_TIMESTAMP(8),
			},
			.default_config = AD7998_ALERT_EN | AD7998_BUSY_ALERT,
			.info = &ad7993_4_7_8_irq_info,
		},
	},
	[ad7998] = {
		.num_channels = 9,
		.noirq_config = {
			.channel = {
				AD799X_CHANNEL(0, 12),
				AD799X_CHANNEL(1, 12),
				AD799X_CHANNEL(2, 12),
				AD799X_CHANNEL(3, 12),
				AD799X_CHANNEL(4, 12),
				AD799X_CHANNEL(5, 12),
				AD799X_CHANNEL(6, 12),
				AD799X_CHANNEL(7, 12),
				IIO_CHAN_SOFT_TIMESTAMP(8),
			},
			.info = &ad7993_4_7_8_noirq_info,
		},
		.irq_config = {
			.channel = {
				AD799X_CHANNEL_WITH_EVENTS(0, 12),
				AD799X_CHANNEL_WITH_EVENTS(1, 12),
				AD799X_CHANNEL_WITH_EVENTS(2, 12),
				AD799X_CHANNEL_WITH_EVENTS(3, 12),
				AD799X_CHANNEL(4, 12),
				AD799X_CHANNEL(5, 12),
				AD799X_CHANNEL(6, 12),
				AD799X_CHANNEL(7, 12),
				IIO_CHAN_SOFT_TIMESTAMP(8),
			},
			.default_config = AD7998_ALERT_EN | AD7998_BUSY_ALERT,
			.info = &ad7993_4_7_8_irq_info,
		},
	},
};

static int ad799x_probe(struct i2c_client *client,
				   const struct i2c_device_id *id)
{
	int ret;
	struct ad799x_state *st;
	struct iio_dev *indio_dev;
	const struct ad799x_chip_info *chip_info =
		&ad799x_chip_info_tbl[id->driver_data];

	indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*st));
	if (indio_dev == NULL)
		return -ENOMEM;

	st = iio_priv(indio_dev);
	/* this is only used for device removal purposes */
	i2c_set_clientdata(client, indio_dev);

	st->id = id->driver_data;
	if (client->irq > 0 && chip_info->irq_config.info)
		st->chip_config = &chip_info->irq_config;
	else
		st->chip_config = &chip_info->noirq_config;

	/* TODO: Add pdata options for filtering and bit delay */

	st->reg = devm_regulator_get(&client->dev, "vcc");
	if (IS_ERR(st->reg))
		return PTR_ERR(st->reg);
	ret = regulator_enable(st->reg);
	if (ret)
		return ret;
	st->vref = devm_regulator_get(&client->dev, "vref");
	if (IS_ERR(st->vref)) {
		ret = PTR_ERR(st->vref);
		goto error_disable_reg;
	}
	ret = regulator_enable(st->vref);
	if (ret)
		goto error_disable_reg;

	st->client = client;

	indio_dev->dev.parent = &client->dev;
	indio_dev->dev.of_node = client->dev.of_node;
	indio_dev->name = id->name;
	indio_dev->info = st->chip_config->info;

	indio_dev->modes = INDIO_DIRECT_MODE;
	indio_dev->channels = st->chip_config->channel;
	indio_dev->num_channels = chip_info->num_channels;

	ret = ad799x_write_config(st, st->chip_config->default_config);
	if (ret < 0)
		goto error_disable_reg;
	ret = ad799x_read_config(st);
	if (ret < 0)
		goto error_disable_reg;
	st->config = ret;

	ret = iio_triggered_buffer_setup(indio_dev, NULL,
		&ad799x_trigger_handler, NULL);
	if (ret)
		goto error_disable_vref;

	if (client->irq > 0) {
		ret = devm_request_threaded_irq(&client->dev,
						client->irq,
						NULL,
						ad799x_event_handler,
						IRQF_TRIGGER_FALLING |
						IRQF_ONESHOT,
						client->name,
						indio_dev);
		if (ret)
			goto error_cleanup_ring;
	}
	ret = iio_device_register(indio_dev);
	if (ret)
		goto error_cleanup_ring;

	return 0;

error_cleanup_ring:
	iio_triggered_buffer_cleanup(indio_dev);
error_disable_vref:
	regulator_disable(st->vref);
error_disable_reg:
	regulator_disable(st->reg);

	return ret;
}

static int ad799x_remove(struct i2c_client *client)
{
	struct iio_dev *indio_dev = i2c_get_clientdata(client);
	struct ad799x_state *st = iio_priv(indio_dev);

	iio_device_unregister(indio_dev);

	iio_triggered_buffer_cleanup(indio_dev);
	regulator_disable(st->vref);
	regulator_disable(st->reg);
	kfree(st->rx_buf);

	return 0;
}

static const struct i2c_device_id ad799x_id[] = {
	{ "ad7991", ad7991 },
	{ "ad7995", ad7995 },
	{ "ad7999", ad7999 },
	{ "ad7992", ad7992 },
	{ "ad7993", ad7993 },
	{ "ad7994", ad7994 },
	{ "ad7997", ad7997 },
	{ "ad7998", ad7998 },
	{}
};

MODULE_DEVICE_TABLE(i2c, ad799x_id);

static struct i2c_driver ad799x_driver = {
	.driver = {
		.name = "ad799x",
	},
	.probe = ad799x_probe,
	.remove = ad799x_remove,
	.id_table = ad799x_id,
};
module_i2c_driver(ad799x_driver);

MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>");
MODULE_DESCRIPTION("Analog Devices AD799x ADC");
MODULE_LICENSE("GPL v2");