xref: /openbmc/linux/drivers/iio/adc/ad799x.c (revision b4e18b29) 
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/bitops.h>
32 
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>
39 
40 #define AD799X_CHANNEL_SHIFT			4
41 
42 /*
43  * AD7991, AD7995 and AD7999 defines
44  */
45 
46 #define AD7991_REF_SEL				0x08
47 #define AD7991_FLTR				0x04
48 #define AD7991_BIT_TRIAL_DELAY			0x02
49 #define AD7991_SAMPLE_DELAY			0x01
50 
51 /*
52  * AD7992, AD7993, AD7994, AD7997 and AD7998 defines
53  */
54 
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)
59 
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
64 
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)
68 
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
78 
79 #define AD7998_ALERT_STAT_CLEAR			0xFF
80 
81 /*
82  * AD7997 and AD7997 defines
83  */
84 
85 #define AD7997_8_READ_SINGLE			BIT(7)
86 #define AD7997_8_READ_SEQUENCE			(BIT(6) | BIT(5) | BIT(4))
87 
88 enum {
89 	ad7991,
90 	ad7995,
91 	ad7999,
92 	ad7992,
93 	ad7993,
94 	ad7994,
95 	ad7997,
96 	ad7998
97 };
98 
99 /**
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
104  */
105 struct ad799x_chip_config {
106 	const struct iio_chan_spec	channel[9];
107 	u16				default_config;
108 	const struct iio_info		*info;
109 };
110 
111 /**
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
116  */
117 struct ad799x_chip_info {
118 	int				num_channels;
119 	const struct ad799x_chip_config	noirq_config;
120 	const struct ad799x_chip_config	irq_config;
121 };
122 
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;
128 	unsigned			id;
129 	u16				config;
130 
131 	u8				*rx_buf;
132 	unsigned int			transfer_size;
133 };
134 
135 static int ad799x_write_config(struct ad799x_state *st, u16 val)
136 {
137 	switch (st->id) {
138 	case ad7997:
139 	case ad7998:
140 		return i2c_smbus_write_word_swapped(st->client, AD7998_CONF_REG,
141 			val);
142 	case ad7992:
143 	case ad7993:
144 	case ad7994:
145 		return i2c_smbus_write_byte_data(st->client, AD7998_CONF_REG,
146 			val);
147 	default:
148 		/* Will be written when doing a conversion */
149 		st->config = val;
150 		return 0;
151 	}
152 }
153 
154 static int ad799x_read_config(struct ad799x_state *st)
155 {
156 	switch (st->id) {
157 	case ad7997:
158 	case ad7998:
159 		return i2c_smbus_read_word_swapped(st->client, AD7998_CONF_REG);
160 	case ad7992:
161 	case ad7993:
162 	case ad7994:
163 		return i2c_smbus_read_byte_data(st->client, AD7998_CONF_REG);
164 	default:
165 		/* No readback support */
166 		return st->config;
167 	}
168 }
169 
170 static int ad799x_update_config(struct ad799x_state *st, u16 config)
171 {
172 	int ret;
173 
174 	ret = ad799x_write_config(st, config);
175 	if (ret < 0)
176 		return ret;
177 	ret = ad799x_read_config(st);
178 	if (ret < 0)
179 		return ret;
180 	st->config = ret;
181 
182 	return 0;
183 }
184 
185 /*
186  * ad799x_trigger_handler() bh of trigger launched polling to ring buffer
187  *
188  * Currently there is no option in this driver to disable the saving of
189  * timestamps within the ring.
190  **/
191 static irqreturn_t ad799x_trigger_handler(int irq, void *p)
192 {
193 	struct iio_poll_func *pf = p;
194 	struct iio_dev *indio_dev = pf->indio_dev;
195 	struct ad799x_state *st = iio_priv(indio_dev);
196 	int b_sent;
197 	u8 cmd;
198 
199 	switch (st->id) {
200 	case ad7991:
201 	case ad7995:
202 	case ad7999:
203 		cmd = st->config |
204 			(*indio_dev->active_scan_mask << AD799X_CHANNEL_SHIFT);
205 		break;
206 	case ad7992:
207 	case ad7993:
208 	case ad7994:
209 		cmd = (*indio_dev->active_scan_mask << AD799X_CHANNEL_SHIFT) |
210 			AD7998_CONV_RES_REG;
211 		break;
212 	case ad7997:
213 	case ad7998:
214 		cmd = AD7997_8_READ_SEQUENCE | AD7998_CONV_RES_REG;
215 		break;
216 	default:
217 		cmd = 0;
218 	}
219 
220 	b_sent = i2c_smbus_read_i2c_block_data(st->client,
221 			cmd, st->transfer_size, st->rx_buf);
222 	if (b_sent < 0)
223 		goto out;
224 
225 	iio_push_to_buffers_with_timestamp(indio_dev, st->rx_buf,
226 			iio_get_time_ns(indio_dev));
227 out:
228 	iio_trigger_notify_done(indio_dev->trig);
229 
230 	return IRQ_HANDLED;
231 }
232 
233 static int ad799x_update_scan_mode(struct iio_dev *indio_dev,
234 	const unsigned long *scan_mask)
235 {
236 	struct ad799x_state *st = iio_priv(indio_dev);
237 
238 	kfree(st->rx_buf);
239 	st->rx_buf = kmalloc(indio_dev->scan_bytes, GFP_KERNEL);
240 	if (!st->rx_buf)
241 		return -ENOMEM;
242 
243 	st->transfer_size = bitmap_weight(scan_mask, indio_dev->masklength) * 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 
259 static int ad799x_scan_direct(struct ad799x_state *st, unsigned 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 
285 static 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 		ret = iio_device_claim_direct_mode(indio_dev);
297 		if (ret)
298 			return ret;
299 		ret = ad799x_scan_direct(st, chan->scan_index);
300 		iio_device_release_direct_mode(indio_dev);
301 
302 		if (ret < 0)
303 			return ret;
304 		*val = (ret >> chan->scan_type.shift) &
305 			GENMASK(chan->scan_type.realbits - 1, 0);
306 		return IIO_VAL_INT;
307 	case IIO_CHAN_INFO_SCALE:
308 		ret = regulator_get_voltage(st->vref);
309 		if (ret < 0)
310 			return ret;
311 		*val = ret / 1000;
312 		*val2 = chan->scan_type.realbits;
313 		return IIO_VAL_FRACTIONAL_LOG2;
314 	}
315 	return -EINVAL;
316 }
317 static const unsigned int ad7998_frequencies[] = {
318 	[AD7998_CYC_DIS]	= 0,
319 	[AD7998_CYC_TCONF_32]	= 15625,
320 	[AD7998_CYC_TCONF_64]	= 7812,
321 	[AD7998_CYC_TCONF_128]	= 3906,
322 	[AD7998_CYC_TCONF_512]	= 976,
323 	[AD7998_CYC_TCONF_1024]	= 488,
324 	[AD7998_CYC_TCONF_2048]	= 244,
325 };
326 
327 static ssize_t ad799x_read_frequency(struct device *dev,
328 					struct device_attribute *attr,
329 					char *buf)
330 {
331 	struct iio_dev *indio_dev = dev_to_iio_dev(dev);
332 	struct ad799x_state *st = iio_priv(indio_dev);
333 
334 	int ret = i2c_smbus_read_byte_data(st->client, AD7998_CYCLE_TMR_REG);
335 	if (ret < 0)
336 		return ret;
337 
338 	return sprintf(buf, "%u\n", ad7998_frequencies[ret & AD7998_CYC_MASK]);
339 }
340 
341 static ssize_t ad799x_write_frequency(struct device *dev,
342 					 struct device_attribute *attr,
343 					 const char *buf,
344 					 size_t len)
345 {
346 	struct iio_dev *indio_dev = dev_to_iio_dev(dev);
347 	struct ad799x_state *st = iio_priv(indio_dev);
348 
349 	long val;
350 	int ret, i;
351 
352 	ret = kstrtol(buf, 10, &val);
353 	if (ret)
354 		return ret;
355 
356 	mutex_lock(&indio_dev->mlock);
357 	ret = i2c_smbus_read_byte_data(st->client, AD7998_CYCLE_TMR_REG);
358 	if (ret < 0)
359 		goto error_ret_mutex;
360 	/* Wipe the bits clean */
361 	ret &= ~AD7998_CYC_MASK;
362 
363 	for (i = 0; i < ARRAY_SIZE(ad7998_frequencies); i++)
364 		if (val == ad7998_frequencies[i])
365 			break;
366 	if (i == ARRAY_SIZE(ad7998_frequencies)) {
367 		ret = -EINVAL;
368 		goto error_ret_mutex;
369 	}
370 
371 	ret = i2c_smbus_write_byte_data(st->client, AD7998_CYCLE_TMR_REG,
372 		ret | i);
373 	if (ret < 0)
374 		goto error_ret_mutex;
375 	ret = len;
376 
377 error_ret_mutex:
378 	mutex_unlock(&indio_dev->mlock);
379 
380 	return ret;
381 }
382 
383 static int ad799x_read_event_config(struct iio_dev *indio_dev,
384 				    const struct iio_chan_spec *chan,
385 				    enum iio_event_type type,
386 				    enum iio_event_direction dir)
387 {
388 	struct ad799x_state *st = iio_priv(indio_dev);
389 
390 	if (!(st->config & AD7998_ALERT_EN))
391 		return 0;
392 
393 	if ((st->config >> AD799X_CHANNEL_SHIFT) & BIT(chan->scan_index))
394 		return 1;
395 
396 	return 0;
397 }
398 
399 static int ad799x_write_event_config(struct iio_dev *indio_dev,
400 				     const struct iio_chan_spec *chan,
401 				     enum iio_event_type type,
402 				     enum iio_event_direction dir,
403 				     int state)
404 {
405 	struct ad799x_state *st = iio_priv(indio_dev);
406 	int ret;
407 
408 	ret = iio_device_claim_direct_mode(indio_dev);
409 	if (ret)
410 		return ret;
411 
412 	if (state)
413 		st->config |= BIT(chan->scan_index) << AD799X_CHANNEL_SHIFT;
414 	else
415 		st->config &= ~(BIT(chan->scan_index) << AD799X_CHANNEL_SHIFT);
416 
417 	if (st->config >> AD799X_CHANNEL_SHIFT)
418 		st->config |= AD7998_ALERT_EN;
419 	else
420 		st->config &= ~AD7998_ALERT_EN;
421 
422 	ret = ad799x_write_config(st, st->config);
423 	iio_device_release_direct_mode(indio_dev);
424 	return ret;
425 }
426 
427 static unsigned int ad799x_threshold_reg(const struct iio_chan_spec *chan,
428 					 enum iio_event_direction dir,
429 					 enum iio_event_info info)
430 {
431 	switch (info) {
432 	case IIO_EV_INFO_VALUE:
433 		if (dir == IIO_EV_DIR_FALLING)
434 			return AD7998_DATALOW_REG(chan->channel);
435 		else
436 			return AD7998_DATAHIGH_REG(chan->channel);
437 	case IIO_EV_INFO_HYSTERESIS:
438 		return AD7998_HYST_REG(chan->channel);
439 	default:
440 		return -EINVAL;
441 	}
442 
443 	return 0;
444 }
445 
446 static int ad799x_write_event_value(struct iio_dev *indio_dev,
447 				    const struct iio_chan_spec *chan,
448 				    enum iio_event_type type,
449 				    enum iio_event_direction dir,
450 				    enum iio_event_info info,
451 				    int val, int val2)
452 {
453 	int ret;
454 	struct ad799x_state *st = iio_priv(indio_dev);
455 
456 	if (val < 0 || val > GENMASK(chan->scan_type.realbits - 1, 0))
457 		return -EINVAL;
458 
459 	mutex_lock(&indio_dev->mlock);
460 	ret = i2c_smbus_write_word_swapped(st->client,
461 		ad799x_threshold_reg(chan, dir, info),
462 		val << chan->scan_type.shift);
463 	mutex_unlock(&indio_dev->mlock);
464 
465 	return ret;
466 }
467 
468 static int ad799x_read_event_value(struct iio_dev *indio_dev,
469 				    const struct iio_chan_spec *chan,
470 				    enum iio_event_type type,
471 				    enum iio_event_direction dir,
472 				    enum iio_event_info info,
473 				    int *val, int *val2)
474 {
475 	int ret;
476 	struct ad799x_state *st = iio_priv(indio_dev);
477 
478 	mutex_lock(&indio_dev->mlock);
479 	ret = i2c_smbus_read_word_swapped(st->client,
480 		ad799x_threshold_reg(chan, dir, info));
481 	mutex_unlock(&indio_dev->mlock);
482 	if (ret < 0)
483 		return ret;
484 	*val = (ret >> chan->scan_type.shift) &
485 		GENMASK(chan->scan_type.realbits - 1, 0);
486 
487 	return IIO_VAL_INT;
488 }
489 
490 static irqreturn_t ad799x_event_handler(int irq, void *private)
491 {
492 	struct iio_dev *indio_dev = private;
493 	struct ad799x_state *st = iio_priv(private);
494 	int i, ret;
495 
496 	ret = i2c_smbus_read_byte_data(st->client, AD7998_ALERT_STAT_REG);
497 	if (ret <= 0)
498 		goto done;
499 
500 	if (i2c_smbus_write_byte_data(st->client, AD7998_ALERT_STAT_REG,
501 		AD7998_ALERT_STAT_CLEAR) < 0)
502 		goto done;
503 
504 	for (i = 0; i < 8; i++) {
505 		if (ret & BIT(i))
506 			iio_push_event(indio_dev,
507 				       i & 0x1 ?
508 				       IIO_UNMOD_EVENT_CODE(IIO_VOLTAGE,
509 							    (i >> 1),
510 							    IIO_EV_TYPE_THRESH,
511 							    IIO_EV_DIR_RISING) :
512 				       IIO_UNMOD_EVENT_CODE(IIO_VOLTAGE,
513 							    (i >> 1),
514 							    IIO_EV_TYPE_THRESH,
515 							    IIO_EV_DIR_FALLING),
516 				       iio_get_time_ns(indio_dev));
517 	}
518 
519 done:
520 	return IRQ_HANDLED;
521 }
522 
523 static IIO_DEV_ATTR_SAMP_FREQ(S_IWUSR | S_IRUGO,
524 			      ad799x_read_frequency,
525 			      ad799x_write_frequency);
526 static IIO_CONST_ATTR_SAMP_FREQ_AVAIL("15625 7812 3906 1953 976 488 244 0");
527 
528 static struct attribute *ad799x_event_attributes[] = {
529 	&iio_dev_attr_sampling_frequency.dev_attr.attr,
530 	&iio_const_attr_sampling_frequency_available.dev_attr.attr,
531 	NULL,
532 };
533 
534 static const struct attribute_group ad799x_event_attrs_group = {
535 	.attrs = ad799x_event_attributes,
536 };
537 
538 static const struct iio_info ad7991_info = {
539 	.read_raw = &ad799x_read_raw,
540 	.update_scan_mode = ad799x_update_scan_mode,
541 };
542 
543 static const struct iio_info ad7993_4_7_8_noirq_info = {
544 	.read_raw = &ad799x_read_raw,
545 	.update_scan_mode = ad799x_update_scan_mode,
546 };
547 
548 static const struct iio_info ad7993_4_7_8_irq_info = {
549 	.read_raw = &ad799x_read_raw,
550 	.event_attrs = &ad799x_event_attrs_group,
551 	.read_event_config = &ad799x_read_event_config,
552 	.write_event_config = &ad799x_write_event_config,
553 	.read_event_value = &ad799x_read_event_value,
554 	.write_event_value = &ad799x_write_event_value,
555 	.update_scan_mode = ad799x_update_scan_mode,
556 };
557 
558 static const struct iio_event_spec ad799x_events[] = {
559 	{
560 		.type = IIO_EV_TYPE_THRESH,
561 		.dir = IIO_EV_DIR_RISING,
562 		.mask_separate = BIT(IIO_EV_INFO_VALUE) |
563 			BIT(IIO_EV_INFO_ENABLE),
564 	}, {
565 		.type = IIO_EV_TYPE_THRESH,
566 		.dir = IIO_EV_DIR_FALLING,
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_EITHER,
572 		.mask_separate = BIT(IIO_EV_INFO_HYSTERESIS),
573 	},
574 };
575 
576 #define _AD799X_CHANNEL(_index, _realbits, _ev_spec, _num_ev_spec) { \
577 	.type = IIO_VOLTAGE, \
578 	.indexed = 1, \
579 	.channel = (_index), \
580 	.info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \
581 	.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE), \
582 	.scan_index = (_index), \
583 	.scan_type = { \
584 		.sign = 'u', \
585 		.realbits = (_realbits), \
586 		.storagebits = 16, \
587 		.shift = 12 - (_realbits), \
588 		.endianness = IIO_BE, \
589 	}, \
590 	.event_spec = _ev_spec, \
591 	.num_event_specs = _num_ev_spec, \
592 }
593 
594 #define AD799X_CHANNEL(_index, _realbits) \
595 	_AD799X_CHANNEL(_index, _realbits, NULL, 0)
596 
597 #define AD799X_CHANNEL_WITH_EVENTS(_index, _realbits) \
598 	_AD799X_CHANNEL(_index, _realbits, ad799x_events, \
599 		ARRAY_SIZE(ad799x_events))
600 
601 static const struct ad799x_chip_info ad799x_chip_info_tbl[] = {
602 	[ad7991] = {
603 		.num_channels = 5,
604 		.noirq_config = {
605 			.channel = {
606 				AD799X_CHANNEL(0, 12),
607 				AD799X_CHANNEL(1, 12),
608 				AD799X_CHANNEL(2, 12),
609 				AD799X_CHANNEL(3, 12),
610 				IIO_CHAN_SOFT_TIMESTAMP(4),
611 			},
612 			.info = &ad7991_info,
613 		},
614 	},
615 	[ad7995] = {
616 		.num_channels = 5,
617 		.noirq_config = {
618 			.channel = {
619 				AD799X_CHANNEL(0, 10),
620 				AD799X_CHANNEL(1, 10),
621 				AD799X_CHANNEL(2, 10),
622 				AD799X_CHANNEL(3, 10),
623 				IIO_CHAN_SOFT_TIMESTAMP(4),
624 			},
625 			.info = &ad7991_info,
626 		},
627 	},
628 	[ad7999] = {
629 		.num_channels = 5,
630 		.noirq_config = {
631 			.channel = {
632 				AD799X_CHANNEL(0, 8),
633 				AD799X_CHANNEL(1, 8),
634 				AD799X_CHANNEL(2, 8),
635 				AD799X_CHANNEL(3, 8),
636 				IIO_CHAN_SOFT_TIMESTAMP(4),
637 			},
638 			.info = &ad7991_info,
639 		},
640 	},
641 	[ad7992] = {
642 		.num_channels = 3,
643 		.noirq_config = {
644 			.channel = {
645 				AD799X_CHANNEL(0, 12),
646 				AD799X_CHANNEL(1, 12),
647 				IIO_CHAN_SOFT_TIMESTAMP(3),
648 			},
649 			.info = &ad7993_4_7_8_noirq_info,
650 		},
651 		.irq_config = {
652 			.channel = {
653 				AD799X_CHANNEL_WITH_EVENTS(0, 12),
654 				AD799X_CHANNEL_WITH_EVENTS(1, 12),
655 				IIO_CHAN_SOFT_TIMESTAMP(3),
656 			},
657 			.default_config = AD7998_ALERT_EN | AD7998_BUSY_ALERT,
658 			.info = &ad7993_4_7_8_irq_info,
659 		},
660 	},
661 	[ad7993] = {
662 		.num_channels = 5,
663 		.noirq_config = {
664 			.channel = {
665 				AD799X_CHANNEL(0, 10),
666 				AD799X_CHANNEL(1, 10),
667 				AD799X_CHANNEL(2, 10),
668 				AD799X_CHANNEL(3, 10),
669 				IIO_CHAN_SOFT_TIMESTAMP(4),
670 			},
671 			.info = &ad7993_4_7_8_noirq_info,
672 		},
673 		.irq_config = {
674 			.channel = {
675 				AD799X_CHANNEL_WITH_EVENTS(0, 10),
676 				AD799X_CHANNEL_WITH_EVENTS(1, 10),
677 				AD799X_CHANNEL_WITH_EVENTS(2, 10),
678 				AD799X_CHANNEL_WITH_EVENTS(3, 10),
679 				IIO_CHAN_SOFT_TIMESTAMP(4),
680 			},
681 			.default_config = AD7998_ALERT_EN | AD7998_BUSY_ALERT,
682 			.info = &ad7993_4_7_8_irq_info,
683 		},
684 	},
685 	[ad7994] = {
686 		.num_channels = 5,
687 		.noirq_config = {
688 			.channel = {
689 				AD799X_CHANNEL(0, 12),
690 				AD799X_CHANNEL(1, 12),
691 				AD799X_CHANNEL(2, 12),
692 				AD799X_CHANNEL(3, 12),
693 				IIO_CHAN_SOFT_TIMESTAMP(4),
694 			},
695 			.info = &ad7993_4_7_8_noirq_info,
696 		},
697 		.irq_config = {
698 			.channel = {
699 				AD799X_CHANNEL_WITH_EVENTS(0, 12),
700 				AD799X_CHANNEL_WITH_EVENTS(1, 12),
701 				AD799X_CHANNEL_WITH_EVENTS(2, 12),
702 				AD799X_CHANNEL_WITH_EVENTS(3, 12),
703 				IIO_CHAN_SOFT_TIMESTAMP(4),
704 			},
705 			.default_config = AD7998_ALERT_EN | AD7998_BUSY_ALERT,
706 			.info = &ad7993_4_7_8_irq_info,
707 		},
708 	},
709 	[ad7997] = {
710 		.num_channels = 9,
711 		.noirq_config = {
712 			.channel = {
713 				AD799X_CHANNEL(0, 10),
714 				AD799X_CHANNEL(1, 10),
715 				AD799X_CHANNEL(2, 10),
716 				AD799X_CHANNEL(3, 10),
717 				AD799X_CHANNEL(4, 10),
718 				AD799X_CHANNEL(5, 10),
719 				AD799X_CHANNEL(6, 10),
720 				AD799X_CHANNEL(7, 10),
721 				IIO_CHAN_SOFT_TIMESTAMP(8),
722 			},
723 			.info = &ad7993_4_7_8_noirq_info,
724 		},
725 		.irq_config = {
726 			.channel = {
727 				AD799X_CHANNEL_WITH_EVENTS(0, 10),
728 				AD799X_CHANNEL_WITH_EVENTS(1, 10),
729 				AD799X_CHANNEL_WITH_EVENTS(2, 10),
730 				AD799X_CHANNEL_WITH_EVENTS(3, 10),
731 				AD799X_CHANNEL(4, 10),
732 				AD799X_CHANNEL(5, 10),
733 				AD799X_CHANNEL(6, 10),
734 				AD799X_CHANNEL(7, 10),
735 				IIO_CHAN_SOFT_TIMESTAMP(8),
736 			},
737 			.default_config = AD7998_ALERT_EN | AD7998_BUSY_ALERT,
738 			.info = &ad7993_4_7_8_irq_info,
739 		},
740 	},
741 	[ad7998] = {
742 		.num_channels = 9,
743 		.noirq_config = {
744 			.channel = {
745 				AD799X_CHANNEL(0, 12),
746 				AD799X_CHANNEL(1, 12),
747 				AD799X_CHANNEL(2, 12),
748 				AD799X_CHANNEL(3, 12),
749 				AD799X_CHANNEL(4, 12),
750 				AD799X_CHANNEL(5, 12),
751 				AD799X_CHANNEL(6, 12),
752 				AD799X_CHANNEL(7, 12),
753 				IIO_CHAN_SOFT_TIMESTAMP(8),
754 			},
755 			.info = &ad7993_4_7_8_noirq_info,
756 		},
757 		.irq_config = {
758 			.channel = {
759 				AD799X_CHANNEL_WITH_EVENTS(0, 12),
760 				AD799X_CHANNEL_WITH_EVENTS(1, 12),
761 				AD799X_CHANNEL_WITH_EVENTS(2, 12),
762 				AD799X_CHANNEL_WITH_EVENTS(3, 12),
763 				AD799X_CHANNEL(4, 12),
764 				AD799X_CHANNEL(5, 12),
765 				AD799X_CHANNEL(6, 12),
766 				AD799X_CHANNEL(7, 12),
767 				IIO_CHAN_SOFT_TIMESTAMP(8),
768 			},
769 			.default_config = AD7998_ALERT_EN | AD7998_BUSY_ALERT,
770 			.info = &ad7993_4_7_8_irq_info,
771 		},
772 	},
773 };
774 
775 static int ad799x_probe(struct i2c_client *client,
776 				   const struct i2c_device_id *id)
777 {
778 	int ret;
779 	struct ad799x_state *st;
780 	struct iio_dev *indio_dev;
781 	const struct ad799x_chip_info *chip_info =
782 		&ad799x_chip_info_tbl[id->driver_data];
783 
784 	indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*st));
785 	if (indio_dev == NULL)
786 		return -ENOMEM;
787 
788 	st = iio_priv(indio_dev);
789 	/* this is only used for device removal purposes */
790 	i2c_set_clientdata(client, indio_dev);
791 
792 	st->id = id->driver_data;
793 	if (client->irq > 0 && chip_info->irq_config.info)
794 		st->chip_config = &chip_info->irq_config;
795 	else
796 		st->chip_config = &chip_info->noirq_config;
797 
798 	/* TODO: Add pdata options for filtering and bit delay */
799 
800 	st->reg = devm_regulator_get(&client->dev, "vcc");
801 	if (IS_ERR(st->reg))
802 		return PTR_ERR(st->reg);
803 	ret = regulator_enable(st->reg);
804 	if (ret)
805 		return ret;
806 	st->vref = devm_regulator_get(&client->dev, "vref");
807 	if (IS_ERR(st->vref)) {
808 		ret = PTR_ERR(st->vref);
809 		goto error_disable_reg;
810 	}
811 	ret = regulator_enable(st->vref);
812 	if (ret)
813 		goto error_disable_reg;
814 
815 	st->client = client;
816 
817 	indio_dev->name = id->name;
818 	indio_dev->info = st->chip_config->info;
819 
820 	indio_dev->modes = INDIO_DIRECT_MODE;
821 	indio_dev->channels = st->chip_config->channel;
822 	indio_dev->num_channels = chip_info->num_channels;
823 
824 	ret = ad799x_update_config(st, st->chip_config->default_config);
825 	if (ret)
826 		goto error_disable_vref;
827 
828 	ret = iio_triggered_buffer_setup(indio_dev, NULL,
829 		&ad799x_trigger_handler, NULL);
830 	if (ret)
831 		goto error_disable_vref;
832 
833 	if (client->irq > 0) {
834 		ret = devm_request_threaded_irq(&client->dev,
835 						client->irq,
836 						NULL,
837 						ad799x_event_handler,
838 						IRQF_TRIGGER_FALLING |
839 						IRQF_ONESHOT,
840 						client->name,
841 						indio_dev);
842 		if (ret)
843 			goto error_cleanup_ring;
844 	}
845 	ret = iio_device_register(indio_dev);
846 	if (ret)
847 		goto error_cleanup_ring;
848 
849 	return 0;
850 
851 error_cleanup_ring:
852 	iio_triggered_buffer_cleanup(indio_dev);
853 error_disable_vref:
854 	regulator_disable(st->vref);
855 error_disable_reg:
856 	regulator_disable(st->reg);
857 
858 	return ret;
859 }
860 
861 static int ad799x_remove(struct i2c_client *client)
862 {
863 	struct iio_dev *indio_dev = i2c_get_clientdata(client);
864 	struct ad799x_state *st = iio_priv(indio_dev);
865 
866 	iio_device_unregister(indio_dev);
867 
868 	iio_triggered_buffer_cleanup(indio_dev);
869 	regulator_disable(st->vref);
870 	regulator_disable(st->reg);
871 	kfree(st->rx_buf);
872 
873 	return 0;
874 }
875 
876 static int __maybe_unused ad799x_suspend(struct device *dev)
877 {
878 	struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
879 	struct ad799x_state *st = iio_priv(indio_dev);
880 
881 	regulator_disable(st->vref);
882 	regulator_disable(st->reg);
883 
884 	return 0;
885 }
886 
887 static int __maybe_unused ad799x_resume(struct device *dev)
888 {
889 	struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
890 	struct ad799x_state *st = iio_priv(indio_dev);
891 	int ret;
892 
893 	ret = regulator_enable(st->reg);
894 	if (ret) {
895 		dev_err(dev, "Unable to enable vcc regulator\n");
896 		return ret;
897 	}
898 	ret = regulator_enable(st->vref);
899 	if (ret) {
900 		regulator_disable(st->reg);
901 		dev_err(dev, "Unable to enable vref regulator\n");
902 		return ret;
903 	}
904 
905 	/* resync config */
906 	ret = ad799x_update_config(st, st->config);
907 	if (ret) {
908 		regulator_disable(st->vref);
909 		regulator_disable(st->reg);
910 		return ret;
911 	}
912 
913 	return 0;
914 }
915 
916 static SIMPLE_DEV_PM_OPS(ad799x_pm_ops, ad799x_suspend, ad799x_resume);
917 
918 static const struct i2c_device_id ad799x_id[] = {
919 	{ "ad7991", ad7991 },
920 	{ "ad7995", ad7995 },
921 	{ "ad7999", ad7999 },
922 	{ "ad7992", ad7992 },
923 	{ "ad7993", ad7993 },
924 	{ "ad7994", ad7994 },
925 	{ "ad7997", ad7997 },
926 	{ "ad7998", ad7998 },
927 	{}
928 };
929 
930 MODULE_DEVICE_TABLE(i2c, ad799x_id);
931 
932 static struct i2c_driver ad799x_driver = {
933 	.driver = {
934 		.name = "ad799x",
935 		.pm = &ad799x_pm_ops,
936 	},
937 	.probe = ad799x_probe,
938 	.remove = ad799x_remove,
939 	.id_table = ad799x_id,
940 };
941 module_i2c_driver(ad799x_driver);
942 
943 MODULE_AUTHOR("Michael Hennerich <michael.hennerich@analog.com>");
944 MODULE_DESCRIPTION("Analog Devices AD799x ADC");
945 MODULE_LICENSE("GPL v2");
946