xref: /openbmc/linux/drivers/iio/adc/ad799x.c (revision bfe655d1) 
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 /**
171  * ad799x_trigger_handler() bh of trigger launched polling to ring buffer
172  *
173  * Currently there is no option in this driver to disable the saving of
174  * timestamps within the ring.
175  **/
176 static irqreturn_t ad799x_trigger_handler(int irq, void *p)
177 {
178 	struct iio_poll_func *pf = p;
179 	struct iio_dev *indio_dev = pf->indio_dev;
180 	struct ad799x_state *st = iio_priv(indio_dev);
181 	int b_sent;
182 	u8 cmd;
183 
184 	switch (st->id) {
185 	case ad7991:
186 	case ad7995:
187 	case ad7999:
188 		cmd = st->config |
189 			(*indio_dev->active_scan_mask << AD799X_CHANNEL_SHIFT);
190 		break;
191 	case ad7992:
192 	case ad7993:
193 	case ad7994:
194 		cmd = (*indio_dev->active_scan_mask << AD799X_CHANNEL_SHIFT) |
195 			AD7998_CONV_RES_REG;
196 		break;
197 	case ad7997:
198 	case ad7998:
199 		cmd = AD7997_8_READ_SEQUENCE | AD7998_CONV_RES_REG;
200 		break;
201 	default:
202 		cmd = 0;
203 	}
204 
205 	b_sent = i2c_smbus_read_i2c_block_data(st->client,
206 			cmd, st->transfer_size, st->rx_buf);
207 	if (b_sent < 0)
208 		goto out;
209 
210 	iio_push_to_buffers_with_timestamp(indio_dev, st->rx_buf,
211 			iio_get_time_ns(indio_dev));
212 out:
213 	iio_trigger_notify_done(indio_dev->trig);
214 
215 	return IRQ_HANDLED;
216 }
217 
218 static int ad799x_update_scan_mode(struct iio_dev *indio_dev,
219 	const unsigned long *scan_mask)
220 {
221 	struct ad799x_state *st = iio_priv(indio_dev);
222 
223 	kfree(st->rx_buf);
224 	st->rx_buf = kmalloc(indio_dev->scan_bytes, GFP_KERNEL);
225 	if (!st->rx_buf)
226 		return -ENOMEM;
227 
228 	st->transfer_size = bitmap_weight(scan_mask, indio_dev->masklength) * 2;
229 
230 	switch (st->id) {
231 	case ad7992:
232 	case ad7993:
233 	case ad7994:
234 	case ad7997:
235 	case ad7998:
236 		st->config &= ~(GENMASK(7, 0) << AD799X_CHANNEL_SHIFT);
237 		st->config |= (*scan_mask << AD799X_CHANNEL_SHIFT);
238 		return ad799x_write_config(st, st->config);
239 	default:
240 		return 0;
241 	}
242 }
243 
244 static int ad799x_scan_direct(struct ad799x_state *st, unsigned ch)
245 {
246 	u8 cmd;
247 
248 	switch (st->id) {
249 	case ad7991:
250 	case ad7995:
251 	case ad7999:
252 		cmd = st->config | (BIT(ch) << AD799X_CHANNEL_SHIFT);
253 		break;
254 	case ad7992:
255 	case ad7993:
256 	case ad7994:
257 		cmd = BIT(ch) << AD799X_CHANNEL_SHIFT;
258 		break;
259 	case ad7997:
260 	case ad7998:
261 		cmd = (ch << AD799X_CHANNEL_SHIFT) | AD7997_8_READ_SINGLE;
262 		break;
263 	default:
264 		return -EINVAL;
265 	}
266 
267 	return i2c_smbus_read_word_swapped(st->client, cmd);
268 }
269 
270 static int ad799x_read_raw(struct iio_dev *indio_dev,
271 			   struct iio_chan_spec const *chan,
272 			   int *val,
273 			   int *val2,
274 			   long m)
275 {
276 	int ret;
277 	struct ad799x_state *st = iio_priv(indio_dev);
278 
279 	switch (m) {
280 	case IIO_CHAN_INFO_RAW:
281 		ret = iio_device_claim_direct_mode(indio_dev);
282 		if (ret)
283 			return ret;
284 		ret = ad799x_scan_direct(st, chan->scan_index);
285 		iio_device_release_direct_mode(indio_dev);
286 
287 		if (ret < 0)
288 			return ret;
289 		*val = (ret >> chan->scan_type.shift) &
290 			GENMASK(chan->scan_type.realbits - 1, 0);
291 		return IIO_VAL_INT;
292 	case IIO_CHAN_INFO_SCALE:
293 		ret = regulator_get_voltage(st->vref);
294 		if (ret < 0)
295 			return ret;
296 		*val = ret / 1000;
297 		*val2 = chan->scan_type.realbits;
298 		return IIO_VAL_FRACTIONAL_LOG2;
299 	}
300 	return -EINVAL;
301 }
302 static const unsigned int ad7998_frequencies[] = {
303 	[AD7998_CYC_DIS]	= 0,
304 	[AD7998_CYC_TCONF_32]	= 15625,
305 	[AD7998_CYC_TCONF_64]	= 7812,
306 	[AD7998_CYC_TCONF_128]	= 3906,
307 	[AD7998_CYC_TCONF_512]	= 976,
308 	[AD7998_CYC_TCONF_1024]	= 488,
309 	[AD7998_CYC_TCONF_2048]	= 244,
310 };
311 
312 static ssize_t ad799x_read_frequency(struct device *dev,
313 					struct device_attribute *attr,
314 					char *buf)
315 {
316 	struct iio_dev *indio_dev = dev_to_iio_dev(dev);
317 	struct ad799x_state *st = iio_priv(indio_dev);
318 
319 	int ret = i2c_smbus_read_byte_data(st->client, AD7998_CYCLE_TMR_REG);
320 	if (ret < 0)
321 		return ret;
322 
323 	return sprintf(buf, "%u\n", ad7998_frequencies[ret & AD7998_CYC_MASK]);
324 }
325 
326 static ssize_t ad799x_write_frequency(struct device *dev,
327 					 struct device_attribute *attr,
328 					 const char *buf,
329 					 size_t len)
330 {
331 	struct iio_dev *indio_dev = dev_to_iio_dev(dev);
332 	struct ad799x_state *st = iio_priv(indio_dev);
333 
334 	long val;
335 	int ret, i;
336 
337 	ret = kstrtol(buf, 10, &val);
338 	if (ret)
339 		return ret;
340 
341 	mutex_lock(&indio_dev->mlock);
342 	ret = i2c_smbus_read_byte_data(st->client, AD7998_CYCLE_TMR_REG);
343 	if (ret < 0)
344 		goto error_ret_mutex;
345 	/* Wipe the bits clean */
346 	ret &= ~AD7998_CYC_MASK;
347 
348 	for (i = 0; i < ARRAY_SIZE(ad7998_frequencies); i++)
349 		if (val == ad7998_frequencies[i])
350 			break;
351 	if (i == ARRAY_SIZE(ad7998_frequencies)) {
352 		ret = -EINVAL;
353 		goto error_ret_mutex;
354 	}
355 
356 	ret = i2c_smbus_write_byte_data(st->client, AD7998_CYCLE_TMR_REG,
357 		ret | i);
358 	if (ret < 0)
359 		goto error_ret_mutex;
360 	ret = len;
361 
362 error_ret_mutex:
363 	mutex_unlock(&indio_dev->mlock);
364 
365 	return ret;
366 }
367 
368 static int ad799x_read_event_config(struct iio_dev *indio_dev,
369 				    const struct iio_chan_spec *chan,
370 				    enum iio_event_type type,
371 				    enum iio_event_direction dir)
372 {
373 	struct ad799x_state *st = iio_priv(indio_dev);
374 
375 	if (!(st->config & AD7998_ALERT_EN))
376 		return 0;
377 
378 	if ((st->config >> AD799X_CHANNEL_SHIFT) & BIT(chan->scan_index))
379 		return 1;
380 
381 	return 0;
382 }
383 
384 static int ad799x_write_event_config(struct iio_dev *indio_dev,
385 				     const struct iio_chan_spec *chan,
386 				     enum iio_event_type type,
387 				     enum iio_event_direction dir,
388 				     int state)
389 {
390 	struct ad799x_state *st = iio_priv(indio_dev);
391 	int ret;
392 
393 	ret = iio_device_claim_direct_mode(indio_dev);
394 	if (ret)
395 		return ret;
396 
397 	if (state)
398 		st->config |= BIT(chan->scan_index) << AD799X_CHANNEL_SHIFT;
399 	else
400 		st->config &= ~(BIT(chan->scan_index) << AD799X_CHANNEL_SHIFT);
401 
402 	if (st->config >> AD799X_CHANNEL_SHIFT)
403 		st->config |= AD7998_ALERT_EN;
404 	else
405 		st->config &= ~AD7998_ALERT_EN;
406 
407 	ret = ad799x_write_config(st, st->config);
408 	iio_device_release_direct_mode(indio_dev);
409 	return ret;
410 }
411 
412 static unsigned int ad799x_threshold_reg(const struct iio_chan_spec *chan,
413 					 enum iio_event_direction dir,
414 					 enum iio_event_info info)
415 {
416 	switch (info) {
417 	case IIO_EV_INFO_VALUE:
418 		if (dir == IIO_EV_DIR_FALLING)
419 			return AD7998_DATALOW_REG(chan->channel);
420 		else
421 			return AD7998_DATAHIGH_REG(chan->channel);
422 	case IIO_EV_INFO_HYSTERESIS:
423 		return AD7998_HYST_REG(chan->channel);
424 	default:
425 		return -EINVAL;
426 	}
427 
428 	return 0;
429 }
430 
431 static int ad799x_write_event_value(struct iio_dev *indio_dev,
432 				    const struct iio_chan_spec *chan,
433 				    enum iio_event_type type,
434 				    enum iio_event_direction dir,
435 				    enum iio_event_info info,
436 				    int val, int val2)
437 {
438 	int ret;
439 	struct ad799x_state *st = iio_priv(indio_dev);
440 
441 	if (val < 0 || val > GENMASK(chan->scan_type.realbits - 1, 0))
442 		return -EINVAL;
443 
444 	mutex_lock(&indio_dev->mlock);
445 	ret = i2c_smbus_write_word_swapped(st->client,
446 		ad799x_threshold_reg(chan, dir, info),
447 		val << chan->scan_type.shift);
448 	mutex_unlock(&indio_dev->mlock);
449 
450 	return ret;
451 }
452 
453 static int ad799x_read_event_value(struct iio_dev *indio_dev,
454 				    const struct iio_chan_spec *chan,
455 				    enum iio_event_type type,
456 				    enum iio_event_direction dir,
457 				    enum iio_event_info info,
458 				    int *val, int *val2)
459 {
460 	int ret;
461 	struct ad799x_state *st = iio_priv(indio_dev);
462 
463 	mutex_lock(&indio_dev->mlock);
464 	ret = i2c_smbus_read_word_swapped(st->client,
465 		ad799x_threshold_reg(chan, dir, info));
466 	mutex_unlock(&indio_dev->mlock);
467 	if (ret < 0)
468 		return ret;
469 	*val = (ret >> chan->scan_type.shift) &
470 		GENMASK(chan->scan_type.realbits - 1, 0);
471 
472 	return IIO_VAL_INT;
473 }
474 
475 static irqreturn_t ad799x_event_handler(int irq, void *private)
476 {
477 	struct iio_dev *indio_dev = private;
478 	struct ad799x_state *st = iio_priv(private);
479 	int i, ret;
480 
481 	ret = i2c_smbus_read_byte_data(st->client, AD7998_ALERT_STAT_REG);
482 	if (ret <= 0)
483 		goto done;
484 
485 	if (i2c_smbus_write_byte_data(st->client, AD7998_ALERT_STAT_REG,
486 		AD7998_ALERT_STAT_CLEAR) < 0)
487 		goto done;
488 
489 	for (i = 0; i < 8; i++) {
490 		if (ret & BIT(i))
491 			iio_push_event(indio_dev,
492 				       i & 0x1 ?
493 				       IIO_UNMOD_EVENT_CODE(IIO_VOLTAGE,
494 							    (i >> 1),
495 							    IIO_EV_TYPE_THRESH,
496 							    IIO_EV_DIR_RISING) :
497 				       IIO_UNMOD_EVENT_CODE(IIO_VOLTAGE,
498 							    (i >> 1),
499 							    IIO_EV_TYPE_THRESH,
500 							    IIO_EV_DIR_FALLING),
501 				       iio_get_time_ns(indio_dev));
502 	}
503 
504 done:
505 	return IRQ_HANDLED;
506 }
507 
508 static IIO_DEV_ATTR_SAMP_FREQ(S_IWUSR | S_IRUGO,
509 			      ad799x_read_frequency,
510 			      ad799x_write_frequency);
511 static IIO_CONST_ATTR_SAMP_FREQ_AVAIL("15625 7812 3906 1953 976 488 244 0");
512 
513 static struct attribute *ad799x_event_attributes[] = {
514 	&iio_dev_attr_sampling_frequency.dev_attr.attr,
515 	&iio_const_attr_sampling_frequency_available.dev_attr.attr,
516 	NULL,
517 };
518 
519 static const struct attribute_group ad799x_event_attrs_group = {
520 	.attrs = ad799x_event_attributes,
521 };
522 
523 static const struct iio_info ad7991_info = {
524 	.read_raw = &ad799x_read_raw,
525 	.update_scan_mode = ad799x_update_scan_mode,
526 };
527 
528 static const struct iio_info ad7993_4_7_8_noirq_info = {
529 	.read_raw = &ad799x_read_raw,
530 	.update_scan_mode = ad799x_update_scan_mode,
531 };
532 
533 static const struct iio_info ad7993_4_7_8_irq_info = {
534 	.read_raw = &ad799x_read_raw,
535 	.event_attrs = &ad799x_event_attrs_group,
536 	.read_event_config = &ad799x_read_event_config,
537 	.write_event_config = &ad799x_write_event_config,
538 	.read_event_value = &ad799x_read_event_value,
539 	.write_event_value = &ad799x_write_event_value,
540 	.update_scan_mode = ad799x_update_scan_mode,
541 };
542 
543 static const struct iio_event_spec ad799x_events[] = {
544 	{
545 		.type = IIO_EV_TYPE_THRESH,
546 		.dir = IIO_EV_DIR_RISING,
547 		.mask_separate = BIT(IIO_EV_INFO_VALUE) |
548 			BIT(IIO_EV_INFO_ENABLE),
549 	}, {
550 		.type = IIO_EV_TYPE_THRESH,
551 		.dir = IIO_EV_DIR_FALLING,
552 		.mask_separate = BIT(IIO_EV_INFO_VALUE) |
553 			BIT(IIO_EV_INFO_ENABLE),
554 	}, {
555 		.type = IIO_EV_TYPE_THRESH,
556 		.dir = IIO_EV_DIR_EITHER,
557 		.mask_separate = BIT(IIO_EV_INFO_HYSTERESIS),
558 	},
559 };
560 
561 #define _AD799X_CHANNEL(_index, _realbits, _ev_spec, _num_ev_spec) { \
562 	.type = IIO_VOLTAGE, \
563 	.indexed = 1, \
564 	.channel = (_index), \
565 	.info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \
566 	.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE), \
567 	.scan_index = (_index), \
568 	.scan_type = { \
569 		.sign = 'u', \
570 		.realbits = (_realbits), \
571 		.storagebits = 16, \
572 		.shift = 12 - (_realbits), \
573 		.endianness = IIO_BE, \
574 	}, \
575 	.event_spec = _ev_spec, \
576 	.num_event_specs = _num_ev_spec, \
577 }
578 
579 #define AD799X_CHANNEL(_index, _realbits) \
580 	_AD799X_CHANNEL(_index, _realbits, NULL, 0)
581 
582 #define AD799X_CHANNEL_WITH_EVENTS(_index, _realbits) \
583 	_AD799X_CHANNEL(_index, _realbits, ad799x_events, \
584 		ARRAY_SIZE(ad799x_events))
585 
586 static const struct ad799x_chip_info ad799x_chip_info_tbl[] = {
587 	[ad7991] = {
588 		.num_channels = 5,
589 		.noirq_config = {
590 			.channel = {
591 				AD799X_CHANNEL(0, 12),
592 				AD799X_CHANNEL(1, 12),
593 				AD799X_CHANNEL(2, 12),
594 				AD799X_CHANNEL(3, 12),
595 				IIO_CHAN_SOFT_TIMESTAMP(4),
596 			},
597 			.info = &ad7991_info,
598 		},
599 	},
600 	[ad7995] = {
601 		.num_channels = 5,
602 		.noirq_config = {
603 			.channel = {
604 				AD799X_CHANNEL(0, 10),
605 				AD799X_CHANNEL(1, 10),
606 				AD799X_CHANNEL(2, 10),
607 				AD799X_CHANNEL(3, 10),
608 				IIO_CHAN_SOFT_TIMESTAMP(4),
609 			},
610 			.info = &ad7991_info,
611 		},
612 	},
613 	[ad7999] = {
614 		.num_channels = 5,
615 		.noirq_config = {
616 			.channel = {
617 				AD799X_CHANNEL(0, 8),
618 				AD799X_CHANNEL(1, 8),
619 				AD799X_CHANNEL(2, 8),
620 				AD799X_CHANNEL(3, 8),
621 				IIO_CHAN_SOFT_TIMESTAMP(4),
622 			},
623 			.info = &ad7991_info,
624 		},
625 	},
626 	[ad7992] = {
627 		.num_channels = 3,
628 		.noirq_config = {
629 			.channel = {
630 				AD799X_CHANNEL(0, 12),
631 				AD799X_CHANNEL(1, 12),
632 				IIO_CHAN_SOFT_TIMESTAMP(3),
633 			},
634 			.info = &ad7993_4_7_8_noirq_info,
635 		},
636 		.irq_config = {
637 			.channel = {
638 				AD799X_CHANNEL_WITH_EVENTS(0, 12),
639 				AD799X_CHANNEL_WITH_EVENTS(1, 12),
640 				IIO_CHAN_SOFT_TIMESTAMP(3),
641 			},
642 			.default_config = AD7998_ALERT_EN | AD7998_BUSY_ALERT,
643 			.info = &ad7993_4_7_8_irq_info,
644 		},
645 	},
646 	[ad7993] = {
647 		.num_channels = 5,
648 		.noirq_config = {
649 			.channel = {
650 				AD799X_CHANNEL(0, 10),
651 				AD799X_CHANNEL(1, 10),
652 				AD799X_CHANNEL(2, 10),
653 				AD799X_CHANNEL(3, 10),
654 				IIO_CHAN_SOFT_TIMESTAMP(4),
655 			},
656 			.info = &ad7993_4_7_8_noirq_info,
657 		},
658 		.irq_config = {
659 			.channel = {
660 				AD799X_CHANNEL_WITH_EVENTS(0, 10),
661 				AD799X_CHANNEL_WITH_EVENTS(1, 10),
662 				AD799X_CHANNEL_WITH_EVENTS(2, 10),
663 				AD799X_CHANNEL_WITH_EVENTS(3, 10),
664 				IIO_CHAN_SOFT_TIMESTAMP(4),
665 			},
666 			.default_config = AD7998_ALERT_EN | AD7998_BUSY_ALERT,
667 			.info = &ad7993_4_7_8_irq_info,
668 		},
669 	},
670 	[ad7994] = {
671 		.num_channels = 5,
672 		.noirq_config = {
673 			.channel = {
674 				AD799X_CHANNEL(0, 12),
675 				AD799X_CHANNEL(1, 12),
676 				AD799X_CHANNEL(2, 12),
677 				AD799X_CHANNEL(3, 12),
678 				IIO_CHAN_SOFT_TIMESTAMP(4),
679 			},
680 			.info = &ad7993_4_7_8_noirq_info,
681 		},
682 		.irq_config = {
683 			.channel = {
684 				AD799X_CHANNEL_WITH_EVENTS(0, 12),
685 				AD799X_CHANNEL_WITH_EVENTS(1, 12),
686 				AD799X_CHANNEL_WITH_EVENTS(2, 12),
687 				AD799X_CHANNEL_WITH_EVENTS(3, 12),
688 				IIO_CHAN_SOFT_TIMESTAMP(4),
689 			},
690 			.default_config = AD7998_ALERT_EN | AD7998_BUSY_ALERT,
691 			.info = &ad7993_4_7_8_irq_info,
692 		},
693 	},
694 	[ad7997] = {
695 		.num_channels = 9,
696 		.noirq_config = {
697 			.channel = {
698 				AD799X_CHANNEL(0, 10),
699 				AD799X_CHANNEL(1, 10),
700 				AD799X_CHANNEL(2, 10),
701 				AD799X_CHANNEL(3, 10),
702 				AD799X_CHANNEL(4, 10),
703 				AD799X_CHANNEL(5, 10),
704 				AD799X_CHANNEL(6, 10),
705 				AD799X_CHANNEL(7, 10),
706 				IIO_CHAN_SOFT_TIMESTAMP(8),
707 			},
708 			.info = &ad7993_4_7_8_noirq_info,
709 		},
710 		.irq_config = {
711 			.channel = {
712 				AD799X_CHANNEL_WITH_EVENTS(0, 10),
713 				AD799X_CHANNEL_WITH_EVENTS(1, 10),
714 				AD799X_CHANNEL_WITH_EVENTS(2, 10),
715 				AD799X_CHANNEL_WITH_EVENTS(3, 10),
716 				AD799X_CHANNEL(4, 10),
717 				AD799X_CHANNEL(5, 10),
718 				AD799X_CHANNEL(6, 10),
719 				AD799X_CHANNEL(7, 10),
720 				IIO_CHAN_SOFT_TIMESTAMP(8),
721 			},
722 			.default_config = AD7998_ALERT_EN | AD7998_BUSY_ALERT,
723 			.info = &ad7993_4_7_8_irq_info,
724 		},
725 	},
726 	[ad7998] = {
727 		.num_channels = 9,
728 		.noirq_config = {
729 			.channel = {
730 				AD799X_CHANNEL(0, 12),
731 				AD799X_CHANNEL(1, 12),
732 				AD799X_CHANNEL(2, 12),
733 				AD799X_CHANNEL(3, 12),
734 				AD799X_CHANNEL(4, 12),
735 				AD799X_CHANNEL(5, 12),
736 				AD799X_CHANNEL(6, 12),
737 				AD799X_CHANNEL(7, 12),
738 				IIO_CHAN_SOFT_TIMESTAMP(8),
739 			},
740 			.info = &ad7993_4_7_8_noirq_info,
741 		},
742 		.irq_config = {
743 			.channel = {
744 				AD799X_CHANNEL_WITH_EVENTS(0, 12),
745 				AD799X_CHANNEL_WITH_EVENTS(1, 12),
746 				AD799X_CHANNEL_WITH_EVENTS(2, 12),
747 				AD799X_CHANNEL_WITH_EVENTS(3, 12),
748 				AD799X_CHANNEL(4, 12),
749 				AD799X_CHANNEL(5, 12),
750 				AD799X_CHANNEL(6, 12),
751 				AD799X_CHANNEL(7, 12),
752 				IIO_CHAN_SOFT_TIMESTAMP(8),
753 			},
754 			.default_config = AD7998_ALERT_EN | AD7998_BUSY_ALERT,
755 			.info = &ad7993_4_7_8_irq_info,
756 		},
757 	},
758 };
759 
760 static int ad799x_probe(struct i2c_client *client,
761 				   const struct i2c_device_id *id)
762 {
763 	int ret;
764 	struct ad799x_state *st;
765 	struct iio_dev *indio_dev;
766 	const struct ad799x_chip_info *chip_info =
767 		&ad799x_chip_info_tbl[id->driver_data];
768 
769 	indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*st));
770 	if (indio_dev == NULL)
771 		return -ENOMEM;
772 
773 	st = iio_priv(indio_dev);
774 	/* this is only used for device removal purposes */
775 	i2c_set_clientdata(client, indio_dev);
776 
777 	st->id = id->driver_data;
778 	if (client->irq > 0 && chip_info->irq_config.info)
779 		st->chip_config = &chip_info->irq_config;
780 	else
781 		st->chip_config = &chip_info->noirq_config;
782 
783 	/* TODO: Add pdata options for filtering and bit delay */
784 
785 	st->reg = devm_regulator_get(&client->dev, "vcc");
786 	if (IS_ERR(st->reg))
787 		return PTR_ERR(st->reg);
788 	ret = regulator_enable(st->reg);
789 	if (ret)
790 		return ret;
791 	st->vref = devm_regulator_get(&client->dev, "vref");
792 	if (IS_ERR(st->vref)) {
793 		ret = PTR_ERR(st->vref);
794 		goto error_disable_reg;
795 	}
796 	ret = regulator_enable(st->vref);
797 	if (ret)
798 		goto error_disable_reg;
799 
800 	st->client = client;
801 
802 	indio_dev->dev.parent = &client->dev;
803 	indio_dev->dev.of_node = client->dev.of_node;
804 	indio_dev->name = id->name;
805 	indio_dev->info = st->chip_config->info;
806 
807 	indio_dev->modes = INDIO_DIRECT_MODE;
808 	indio_dev->channels = st->chip_config->channel;
809 	indio_dev->num_channels = chip_info->num_channels;
810 
811 	ret = ad799x_write_config(st, st->chip_config->default_config);
812 	if (ret < 0)
813 		goto error_disable_reg;
814 	ret = ad799x_read_config(st);
815 	if (ret < 0)
816 		goto error_disable_reg;
817 	st->config = ret;
818 
819 	ret = iio_triggered_buffer_setup(indio_dev, NULL,
820 		&ad799x_trigger_handler, NULL);
821 	if (ret)
822 		goto error_disable_vref;
823 
824 	if (client->irq > 0) {
825 		ret = devm_request_threaded_irq(&client->dev,
826 						client->irq,
827 						NULL,
828 						ad799x_event_handler,
829 						IRQF_TRIGGER_FALLING |
830 						IRQF_ONESHOT,
831 						client->name,
832 						indio_dev);
833 		if (ret)
834 			goto error_cleanup_ring;
835 	}
836 	ret = iio_device_register(indio_dev);
837 	if (ret)
838 		goto error_cleanup_ring;
839 
840 	return 0;
841 
842 error_cleanup_ring:
843 	iio_triggered_buffer_cleanup(indio_dev);
844 error_disable_vref:
845 	regulator_disable(st->vref);
846 error_disable_reg:
847 	regulator_disable(st->reg);
848 
849 	return ret;
850 }
851 
852 static int ad799x_remove(struct i2c_client *client)
853 {
854 	struct iio_dev *indio_dev = i2c_get_clientdata(client);
855 	struct ad799x_state *st = iio_priv(indio_dev);
856 
857 	iio_device_unregister(indio_dev);
858 
859 	iio_triggered_buffer_cleanup(indio_dev);
860 	regulator_disable(st->vref);
861 	regulator_disable(st->reg);
862 	kfree(st->rx_buf);
863 
864 	return 0;
865 }
866 
867 static const struct i2c_device_id ad799x_id[] = {
868 	{ "ad7991", ad7991 },
869 	{ "ad7995", ad7995 },
870 	{ "ad7999", ad7999 },
871 	{ "ad7992", ad7992 },
872 	{ "ad7993", ad7993 },
873 	{ "ad7994", ad7994 },
874 	{ "ad7997", ad7997 },
875 	{ "ad7998", ad7998 },
876 	{}
877 };
878 
879 MODULE_DEVICE_TABLE(i2c, ad799x_id);
880 
881 static struct i2c_driver ad799x_driver = {
882 	.driver = {
883 		.name = "ad799x",
884 	},
885 	.probe = ad799x_probe,
886 	.remove = ad799x_remove,
887 	.id_table = ad799x_id,
888 };
889 module_i2c_driver(ad799x_driver);
890 
891 MODULE_AUTHOR("Michael Hennerich <michael.hennerich@analog.com>");
892 MODULE_DESCRIPTION("Analog Devices AD799x ADC");
893 MODULE_LICENSE("GPL v2");
894