xref: /openbmc/linux/drivers/iio/adc/ad799x.c (revision 2c684d89)
1 /*
2  * iio/adc/ad799x.c
3  * Copyright (C) 2010-2011 Michael Hennerich, Analog Devices Inc.
4  *
5  * based on iio/adc/max1363
6  * Copyright (C) 2008-2010 Jonathan Cameron
7  *
8  * based on linux/drivers/i2c/chips/max123x
9  * Copyright (C) 2002-2004 Stefan Eletzhofer
10  *
11  * based on linux/drivers/acron/char/pcf8583.c
12  * Copyright (C) 2000 Russell King
13  *
14  * This program is free software; you can redistribute it and/or modify
15  * it under the terms of the GNU General Public License version 2 as
16  * published by the Free Software Foundation.
17  *
18  * ad799x.c
19  *
20  * Support for ad7991, ad7995, ad7999, ad7992, ad7993, ad7994, ad7997,
21  * ad7998 and similar chips.
22  *
23  */
24 
25 #include <linux/interrupt.h>
26 #include <linux/device.h>
27 #include <linux/kernel.h>
28 #include <linux/sysfs.h>
29 #include <linux/i2c.h>
30 #include <linux/regulator/consumer.h>
31 #include <linux/slab.h>
32 #include <linux/types.h>
33 #include <linux/err.h>
34 #include <linux/module.h>
35 #include <linux/bitops.h>
36 
37 #include <linux/iio/iio.h>
38 #include <linux/iio/sysfs.h>
39 #include <linux/iio/events.h>
40 #include <linux/iio/buffer.h>
41 #include <linux/iio/trigger_consumer.h>
42 #include <linux/iio/triggered_buffer.h>
43 
44 #define AD799X_CHANNEL_SHIFT			4
45 
46 /*
47  * AD7991, AD7995 and AD7999 defines
48  */
49 
50 #define AD7991_REF_SEL				0x08
51 #define AD7991_FLTR				0x04
52 #define AD7991_BIT_TRIAL_DELAY			0x02
53 #define AD7991_SAMPLE_DELAY			0x01
54 
55 /*
56  * AD7992, AD7993, AD7994, AD7997 and AD7998 defines
57  */
58 
59 #define AD7998_FLTR				BIT(3)
60 #define AD7998_ALERT_EN				BIT(2)
61 #define AD7998_BUSY_ALERT			BIT(1)
62 #define AD7998_BUSY_ALERT_POL			BIT(0)
63 
64 #define AD7998_CONV_RES_REG			0x0
65 #define AD7998_ALERT_STAT_REG			0x1
66 #define AD7998_CONF_REG				0x2
67 #define AD7998_CYCLE_TMR_REG			0x3
68 
69 #define AD7998_DATALOW_REG(x)			((x) * 3 + 0x4)
70 #define AD7998_DATAHIGH_REG(x)			((x) * 3 + 0x5)
71 #define AD7998_HYST_REG(x)			((x) * 3 + 0x6)
72 
73 #define AD7998_CYC_MASK				GENMASK(2, 0)
74 #define AD7998_CYC_DIS				0x0
75 #define AD7998_CYC_TCONF_32			0x1
76 #define AD7998_CYC_TCONF_64			0x2
77 #define AD7998_CYC_TCONF_128			0x3
78 #define AD7998_CYC_TCONF_256			0x4
79 #define AD7998_CYC_TCONF_512			0x5
80 #define AD7998_CYC_TCONF_1024			0x6
81 #define AD7998_CYC_TCONF_2048			0x7
82 
83 #define AD7998_ALERT_STAT_CLEAR			0xFF
84 
85 /*
86  * AD7997 and AD7997 defines
87  */
88 
89 #define AD7997_8_READ_SINGLE			BIT(7)
90 #define AD7997_8_READ_SEQUENCE			(BIT(6) | BIT(5) | BIT(4))
91 
92 enum {
93 	ad7991,
94 	ad7995,
95 	ad7999,
96 	ad7992,
97 	ad7993,
98 	ad7994,
99 	ad7997,
100 	ad7998
101 };
102 
103 /**
104  * struct ad799x_chip_config - chip specific information
105  * @channel:		channel specification
106  * @default_config:	device default configuration
107  * @info:		pointer to iio_info struct
108  */
109 struct ad799x_chip_config {
110 	const struct iio_chan_spec	channel[9];
111 	u16				default_config;
112 	const struct iio_info		*info;
113 };
114 
115 /**
116  * struct ad799x_chip_info - chip specific information
117  * @num_channels:	number of channels
118  * @noirq_config:	device configuration w/o IRQ
119  * @irq_config:		device configuration w/IRQ
120  */
121 struct ad799x_chip_info {
122 	int				num_channels;
123 	const struct ad799x_chip_config	noirq_config;
124 	const struct ad799x_chip_config	irq_config;
125 };
126 
127 struct ad799x_state {
128 	struct i2c_client		*client;
129 	const struct ad799x_chip_config	*chip_config;
130 	struct regulator		*reg;
131 	struct regulator		*vref;
132 	unsigned			id;
133 	u16				config;
134 
135 	u8				*rx_buf;
136 	unsigned int			transfer_size;
137 };
138 
139 static int ad799x_write_config(struct ad799x_state *st, u16 val)
140 {
141 	switch (st->id) {
142 	case ad7997:
143 	case ad7998:
144 		return i2c_smbus_write_word_swapped(st->client, AD7998_CONF_REG,
145 			val);
146 	case ad7992:
147 	case ad7993:
148 	case ad7994:
149 		return i2c_smbus_write_byte_data(st->client, AD7998_CONF_REG,
150 			val);
151 	default:
152 		/* Will be written when doing a conversion */
153 		st->config = val;
154 		return 0;
155 	}
156 }
157 
158 static int ad799x_read_config(struct ad799x_state *st)
159 {
160 	switch (st->id) {
161 	case ad7997:
162 	case ad7998:
163 		return i2c_smbus_read_word_swapped(st->client, AD7998_CONF_REG);
164 	case ad7992:
165 	case ad7993:
166 	case ad7994:
167 		return i2c_smbus_read_byte_data(st->client, AD7998_CONF_REG);
168 	default:
169 		/* No readback support */
170 		return st->config;
171 	}
172 }
173 
174 /**
175  * ad799x_trigger_handler() bh of trigger launched polling to ring buffer
176  *
177  * Currently there is no option in this driver to disable the saving of
178  * timestamps within the ring.
179  **/
180 static irqreturn_t ad799x_trigger_handler(int irq, void *p)
181 {
182 	struct iio_poll_func *pf = p;
183 	struct iio_dev *indio_dev = pf->indio_dev;
184 	struct ad799x_state *st = iio_priv(indio_dev);
185 	int b_sent;
186 	u8 cmd;
187 
188 	switch (st->id) {
189 	case ad7991:
190 	case ad7995:
191 	case ad7999:
192 		cmd = st->config |
193 			(*indio_dev->active_scan_mask << AD799X_CHANNEL_SHIFT);
194 		break;
195 	case ad7992:
196 	case ad7993:
197 	case ad7994:
198 		cmd = (*indio_dev->active_scan_mask << AD799X_CHANNEL_SHIFT) |
199 			AD7998_CONV_RES_REG;
200 		break;
201 	case ad7997:
202 	case ad7998:
203 		cmd = AD7997_8_READ_SEQUENCE | AD7998_CONV_RES_REG;
204 		break;
205 	default:
206 		cmd = 0;
207 	}
208 
209 	b_sent = i2c_smbus_read_i2c_block_data(st->client,
210 			cmd, st->transfer_size, st->rx_buf);
211 	if (b_sent < 0)
212 		goto out;
213 
214 	iio_push_to_buffers_with_timestamp(indio_dev, st->rx_buf,
215 			iio_get_time_ns());
216 out:
217 	iio_trigger_notify_done(indio_dev->trig);
218 
219 	return IRQ_HANDLED;
220 }
221 
222 static int ad799x_update_scan_mode(struct iio_dev *indio_dev,
223 	const unsigned long *scan_mask)
224 {
225 	struct ad799x_state *st = iio_priv(indio_dev);
226 
227 	kfree(st->rx_buf);
228 	st->rx_buf = kmalloc(indio_dev->scan_bytes, GFP_KERNEL);
229 	if (!st->rx_buf)
230 		return -ENOMEM;
231 
232 	st->transfer_size = bitmap_weight(scan_mask, indio_dev->masklength) * 2;
233 
234 	switch (st->id) {
235 	case ad7992:
236 	case ad7993:
237 	case ad7994:
238 	case ad7997:
239 	case ad7998:
240 		st->config &= ~(GENMASK(7, 0) << AD799X_CHANNEL_SHIFT);
241 		st->config |= (*scan_mask << AD799X_CHANNEL_SHIFT);
242 		return ad799x_write_config(st, st->config);
243 	default:
244 		return 0;
245 	}
246 }
247 
248 static int ad799x_scan_direct(struct ad799x_state *st, unsigned ch)
249 {
250 	u8 cmd;
251 
252 	switch (st->id) {
253 	case ad7991:
254 	case ad7995:
255 	case ad7999:
256 		cmd = st->config | (BIT(ch) << AD799X_CHANNEL_SHIFT);
257 		break;
258 	case ad7992:
259 	case ad7993:
260 	case ad7994:
261 		cmd = BIT(ch) << AD799X_CHANNEL_SHIFT;
262 		break;
263 	case ad7997:
264 	case ad7998:
265 		cmd = (ch << AD799X_CHANNEL_SHIFT) | AD7997_8_READ_SINGLE;
266 		break;
267 	default:
268 		return -EINVAL;
269 	}
270 
271 	return i2c_smbus_read_word_swapped(st->client, cmd);
272 }
273 
274 static int ad799x_read_raw(struct iio_dev *indio_dev,
275 			   struct iio_chan_spec const *chan,
276 			   int *val,
277 			   int *val2,
278 			   long m)
279 {
280 	int ret;
281 	struct ad799x_state *st = iio_priv(indio_dev);
282 
283 	switch (m) {
284 	case IIO_CHAN_INFO_RAW:
285 		mutex_lock(&indio_dev->mlock);
286 		if (iio_buffer_enabled(indio_dev))
287 			ret = -EBUSY;
288 		else
289 			ret = ad799x_scan_direct(st, chan->scan_index);
290 		mutex_unlock(&indio_dev->mlock);
291 
292 		if (ret < 0)
293 			return ret;
294 		*val = (ret >> chan->scan_type.shift) &
295 			GENMASK(chan->scan_type.realbits - 1, 0);
296 		return IIO_VAL_INT;
297 	case IIO_CHAN_INFO_SCALE:
298 		ret = regulator_get_voltage(st->vref);
299 		if (ret < 0)
300 			return ret;
301 		*val = ret / 1000;
302 		*val2 = chan->scan_type.realbits;
303 		return IIO_VAL_FRACTIONAL_LOG2;
304 	}
305 	return -EINVAL;
306 }
307 static const unsigned int ad7998_frequencies[] = {
308 	[AD7998_CYC_DIS]	= 0,
309 	[AD7998_CYC_TCONF_32]	= 15625,
310 	[AD7998_CYC_TCONF_64]	= 7812,
311 	[AD7998_CYC_TCONF_128]	= 3906,
312 	[AD7998_CYC_TCONF_512]	= 976,
313 	[AD7998_CYC_TCONF_1024]	= 488,
314 	[AD7998_CYC_TCONF_2048]	= 244,
315 };
316 
317 static ssize_t ad799x_read_frequency(struct device *dev,
318 					struct device_attribute *attr,
319 					char *buf)
320 {
321 	struct iio_dev *indio_dev = dev_to_iio_dev(dev);
322 	struct ad799x_state *st = iio_priv(indio_dev);
323 
324 	int ret = i2c_smbus_read_byte_data(st->client, AD7998_CYCLE_TMR_REG);
325 	if (ret < 0)
326 		return ret;
327 
328 	return sprintf(buf, "%u\n", ad7998_frequencies[ret & AD7998_CYC_MASK]);
329 }
330 
331 static ssize_t ad799x_write_frequency(struct device *dev,
332 					 struct device_attribute *attr,
333 					 const char *buf,
334 					 size_t len)
335 {
336 	struct iio_dev *indio_dev = dev_to_iio_dev(dev);
337 	struct ad799x_state *st = iio_priv(indio_dev);
338 
339 	long val;
340 	int ret, i;
341 
342 	ret = kstrtol(buf, 10, &val);
343 	if (ret)
344 		return ret;
345 
346 	mutex_lock(&indio_dev->mlock);
347 	ret = i2c_smbus_read_byte_data(st->client, AD7998_CYCLE_TMR_REG);
348 	if (ret < 0)
349 		goto error_ret_mutex;
350 	/* Wipe the bits clean */
351 	ret &= ~AD7998_CYC_MASK;
352 
353 	for (i = 0; i < ARRAY_SIZE(ad7998_frequencies); i++)
354 		if (val == ad7998_frequencies[i])
355 			break;
356 	if (i == ARRAY_SIZE(ad7998_frequencies)) {
357 		ret = -EINVAL;
358 		goto error_ret_mutex;
359 	}
360 
361 	ret = i2c_smbus_write_byte_data(st->client, AD7998_CYCLE_TMR_REG,
362 		ret | i);
363 	if (ret < 0)
364 		goto error_ret_mutex;
365 	ret = len;
366 
367 error_ret_mutex:
368 	mutex_unlock(&indio_dev->mlock);
369 
370 	return ret;
371 }
372 
373 static int ad799x_read_event_config(struct iio_dev *indio_dev,
374 				    const struct iio_chan_spec *chan,
375 				    enum iio_event_type type,
376 				    enum iio_event_direction dir)
377 {
378 	struct ad799x_state *st = iio_priv(indio_dev);
379 
380 	if (!(st->config & AD7998_ALERT_EN))
381 		return 0;
382 
383 	if ((st->config >> AD799X_CHANNEL_SHIFT) & BIT(chan->scan_index))
384 		return 1;
385 
386 	return 0;
387 }
388 
389 static int ad799x_write_event_config(struct iio_dev *indio_dev,
390 				     const struct iio_chan_spec *chan,
391 				     enum iio_event_type type,
392 				     enum iio_event_direction dir,
393 				     int state)
394 {
395 	struct ad799x_state *st = iio_priv(indio_dev);
396 	int ret;
397 
398 	mutex_lock(&indio_dev->mlock);
399 	if (iio_buffer_enabled(indio_dev)) {
400 		ret = -EBUSY;
401 		goto done;
402 	}
403 
404 	if (state)
405 		st->config |= BIT(chan->scan_index) << AD799X_CHANNEL_SHIFT;
406 	else
407 		st->config &= ~(BIT(chan->scan_index) << AD799X_CHANNEL_SHIFT);
408 
409 	if (st->config >> AD799X_CHANNEL_SHIFT)
410 		st->config |= AD7998_ALERT_EN;
411 	else
412 		st->config &= ~AD7998_ALERT_EN;
413 
414 	ret = ad799x_write_config(st, st->config);
415 
416 done:
417 	mutex_unlock(&indio_dev->mlock);
418 
419 	return ret;
420 }
421 
422 static unsigned int ad799x_threshold_reg(const struct iio_chan_spec *chan,
423 					 enum iio_event_direction dir,
424 					 enum iio_event_info info)
425 {
426 	switch (info) {
427 	case IIO_EV_INFO_VALUE:
428 		if (dir == IIO_EV_DIR_FALLING)
429 			return AD7998_DATALOW_REG(chan->channel);
430 		else
431 			return AD7998_DATAHIGH_REG(chan->channel);
432 	case IIO_EV_INFO_HYSTERESIS:
433 		return AD7998_HYST_REG(chan->channel);
434 	default:
435 		return -EINVAL;
436 	}
437 
438 	return 0;
439 }
440 
441 static int ad799x_write_event_value(struct iio_dev *indio_dev,
442 				    const struct iio_chan_spec *chan,
443 				    enum iio_event_type type,
444 				    enum iio_event_direction dir,
445 				    enum iio_event_info info,
446 				    int val, int val2)
447 {
448 	int ret;
449 	struct ad799x_state *st = iio_priv(indio_dev);
450 
451 	if (val < 0 || val > GENMASK(chan->scan_type.realbits - 1, 0))
452 		return -EINVAL;
453 
454 	mutex_lock(&indio_dev->mlock);
455 	ret = i2c_smbus_write_word_swapped(st->client,
456 		ad799x_threshold_reg(chan, dir, info),
457 		val << chan->scan_type.shift);
458 	mutex_unlock(&indio_dev->mlock);
459 
460 	return ret;
461 }
462 
463 static int ad799x_read_event_value(struct iio_dev *indio_dev,
464 				    const struct iio_chan_spec *chan,
465 				    enum iio_event_type type,
466 				    enum iio_event_direction dir,
467 				    enum iio_event_info info,
468 				    int *val, int *val2)
469 {
470 	int ret;
471 	struct ad799x_state *st = iio_priv(indio_dev);
472 
473 	mutex_lock(&indio_dev->mlock);
474 	ret = i2c_smbus_read_word_swapped(st->client,
475 		ad799x_threshold_reg(chan, dir, info));
476 	mutex_unlock(&indio_dev->mlock);
477 	if (ret < 0)
478 		return ret;
479 	*val = (ret >> chan->scan_type.shift) &
480 		GENMASK(chan->scan_type.realbits - 1 , 0);
481 
482 	return IIO_VAL_INT;
483 }
484 
485 static irqreturn_t ad799x_event_handler(int irq, void *private)
486 {
487 	struct iio_dev *indio_dev = private;
488 	struct ad799x_state *st = iio_priv(private);
489 	int i, ret;
490 
491 	ret = i2c_smbus_read_byte_data(st->client, AD7998_ALERT_STAT_REG);
492 	if (ret <= 0)
493 		goto done;
494 
495 	if (i2c_smbus_write_byte_data(st->client, AD7998_ALERT_STAT_REG,
496 		AD7998_ALERT_STAT_CLEAR) < 0)
497 		goto done;
498 
499 	for (i = 0; i < 8; i++) {
500 		if (ret & BIT(i))
501 			iio_push_event(indio_dev,
502 				       i & 0x1 ?
503 				       IIO_UNMOD_EVENT_CODE(IIO_VOLTAGE,
504 							    (i >> 1),
505 							    IIO_EV_TYPE_THRESH,
506 							    IIO_EV_DIR_RISING) :
507 				       IIO_UNMOD_EVENT_CODE(IIO_VOLTAGE,
508 							    (i >> 1),
509 							    IIO_EV_TYPE_THRESH,
510 							    IIO_EV_DIR_FALLING),
511 				       iio_get_time_ns());
512 	}
513 
514 done:
515 	return IRQ_HANDLED;
516 }
517 
518 static IIO_DEV_ATTR_SAMP_FREQ(S_IWUSR | S_IRUGO,
519 			      ad799x_read_frequency,
520 			      ad799x_write_frequency);
521 static IIO_CONST_ATTR_SAMP_FREQ_AVAIL("15625 7812 3906 1953 976 488 244 0");
522 
523 static struct attribute *ad799x_event_attributes[] = {
524 	&iio_dev_attr_sampling_frequency.dev_attr.attr,
525 	&iio_const_attr_sampling_frequency_available.dev_attr.attr,
526 	NULL,
527 };
528 
529 static struct attribute_group ad799x_event_attrs_group = {
530 	.attrs = ad799x_event_attributes,
531 };
532 
533 static const struct iio_info ad7991_info = {
534 	.read_raw = &ad799x_read_raw,
535 	.driver_module = THIS_MODULE,
536 };
537 
538 static const struct iio_info ad7993_4_7_8_noirq_info = {
539 	.read_raw = &ad799x_read_raw,
540 	.driver_module = THIS_MODULE,
541 	.update_scan_mode = ad799x_update_scan_mode,
542 };
543 
544 static const struct iio_info ad7993_4_7_8_irq_info = {
545 	.read_raw = &ad799x_read_raw,
546 	.event_attrs = &ad799x_event_attrs_group,
547 	.read_event_config = &ad799x_read_event_config,
548 	.write_event_config = &ad799x_write_event_config,
549 	.read_event_value = &ad799x_read_event_value,
550 	.write_event_value = &ad799x_write_event_value,
551 	.driver_module = THIS_MODULE,
552 	.update_scan_mode = ad799x_update_scan_mode,
553 };
554 
555 static const struct iio_event_spec ad799x_events[] = {
556 	{
557 		.type = IIO_EV_TYPE_THRESH,
558 		.dir = IIO_EV_DIR_RISING,
559 		.mask_separate = BIT(IIO_EV_INFO_VALUE) |
560 			BIT(IIO_EV_INFO_ENABLE),
561 	}, {
562 		.type = IIO_EV_TYPE_THRESH,
563 		.dir = IIO_EV_DIR_FALLING,
564 		.mask_separate = BIT(IIO_EV_INFO_VALUE) |
565 			BIT(IIO_EV_INFO_ENABLE),
566 	}, {
567 		.type = IIO_EV_TYPE_THRESH,
568 		.dir = IIO_EV_DIR_EITHER,
569 		.mask_separate = BIT(IIO_EV_INFO_HYSTERESIS),
570 	},
571 };
572 
573 #define _AD799X_CHANNEL(_index, _realbits, _ev_spec, _num_ev_spec) { \
574 	.type = IIO_VOLTAGE, \
575 	.indexed = 1, \
576 	.channel = (_index), \
577 	.info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \
578 	.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE), \
579 	.scan_index = (_index), \
580 	.scan_type = { \
581 		.sign = 'u', \
582 		.realbits = (_realbits), \
583 		.storagebits = 16, \
584 		.shift = 12 - (_realbits), \
585 		.endianness = IIO_BE, \
586 	}, \
587 	.event_spec = _ev_spec, \
588 	.num_event_specs = _num_ev_spec, \
589 }
590 
591 #define AD799X_CHANNEL(_index, _realbits) \
592 	_AD799X_CHANNEL(_index, _realbits, NULL, 0)
593 
594 #define AD799X_CHANNEL_WITH_EVENTS(_index, _realbits) \
595 	_AD799X_CHANNEL(_index, _realbits, ad799x_events, \
596 		ARRAY_SIZE(ad799x_events))
597 
598 static const struct ad799x_chip_info ad799x_chip_info_tbl[] = {
599 	[ad7991] = {
600 		.num_channels = 5,
601 		.noirq_config = {
602 			.channel = {
603 				AD799X_CHANNEL(0, 12),
604 				AD799X_CHANNEL(1, 12),
605 				AD799X_CHANNEL(2, 12),
606 				AD799X_CHANNEL(3, 12),
607 				IIO_CHAN_SOFT_TIMESTAMP(4),
608 			},
609 			.info = &ad7991_info,
610 		},
611 	},
612 	[ad7995] = {
613 		.num_channels = 5,
614 		.noirq_config = {
615 			.channel = {
616 				AD799X_CHANNEL(0, 10),
617 				AD799X_CHANNEL(1, 10),
618 				AD799X_CHANNEL(2, 10),
619 				AD799X_CHANNEL(3, 10),
620 				IIO_CHAN_SOFT_TIMESTAMP(4),
621 			},
622 			.info = &ad7991_info,
623 		},
624 	},
625 	[ad7999] = {
626 		.num_channels = 5,
627 		.noirq_config = {
628 			.channel = {
629 				AD799X_CHANNEL(0, 8),
630 				AD799X_CHANNEL(1, 8),
631 				AD799X_CHANNEL(2, 8),
632 				AD799X_CHANNEL(3, 8),
633 				IIO_CHAN_SOFT_TIMESTAMP(4),
634 			},
635 			.info = &ad7991_info,
636 		},
637 	},
638 	[ad7992] = {
639 		.num_channels = 3,
640 		.noirq_config = {
641 			.channel = {
642 				AD799X_CHANNEL(0, 12),
643 				AD799X_CHANNEL(1, 12),
644 				IIO_CHAN_SOFT_TIMESTAMP(3),
645 			},
646 			.info = &ad7993_4_7_8_noirq_info,
647 		},
648 		.irq_config = {
649 			.channel = {
650 				AD799X_CHANNEL_WITH_EVENTS(0, 12),
651 				AD799X_CHANNEL_WITH_EVENTS(1, 12),
652 				IIO_CHAN_SOFT_TIMESTAMP(3),
653 			},
654 			.default_config = AD7998_ALERT_EN | AD7998_BUSY_ALERT,
655 			.info = &ad7993_4_7_8_irq_info,
656 		},
657 	},
658 	[ad7993] = {
659 		.num_channels = 5,
660 		.noirq_config = {
661 			.channel = {
662 				AD799X_CHANNEL(0, 10),
663 				AD799X_CHANNEL(1, 10),
664 				AD799X_CHANNEL(2, 10),
665 				AD799X_CHANNEL(3, 10),
666 				IIO_CHAN_SOFT_TIMESTAMP(4),
667 			},
668 			.info = &ad7993_4_7_8_noirq_info,
669 		},
670 		.irq_config = {
671 			.channel = {
672 				AD799X_CHANNEL_WITH_EVENTS(0, 10),
673 				AD799X_CHANNEL_WITH_EVENTS(1, 10),
674 				AD799X_CHANNEL_WITH_EVENTS(2, 10),
675 				AD799X_CHANNEL_WITH_EVENTS(3, 10),
676 				IIO_CHAN_SOFT_TIMESTAMP(4),
677 			},
678 			.default_config = AD7998_ALERT_EN | AD7998_BUSY_ALERT,
679 			.info = &ad7993_4_7_8_irq_info,
680 		},
681 	},
682 	[ad7994] = {
683 		.num_channels = 5,
684 		.noirq_config = {
685 			.channel = {
686 				AD799X_CHANNEL(0, 12),
687 				AD799X_CHANNEL(1, 12),
688 				AD799X_CHANNEL(2, 12),
689 				AD799X_CHANNEL(3, 12),
690 				IIO_CHAN_SOFT_TIMESTAMP(4),
691 			},
692 			.info = &ad7993_4_7_8_noirq_info,
693 		},
694 		.irq_config = {
695 			.channel = {
696 				AD799X_CHANNEL_WITH_EVENTS(0, 12),
697 				AD799X_CHANNEL_WITH_EVENTS(1, 12),
698 				AD799X_CHANNEL_WITH_EVENTS(2, 12),
699 				AD799X_CHANNEL_WITH_EVENTS(3, 12),
700 				IIO_CHAN_SOFT_TIMESTAMP(4),
701 			},
702 			.default_config = AD7998_ALERT_EN | AD7998_BUSY_ALERT,
703 			.info = &ad7993_4_7_8_irq_info,
704 		},
705 	},
706 	[ad7997] = {
707 		.num_channels = 9,
708 		.noirq_config = {
709 			.channel = {
710 				AD799X_CHANNEL(0, 10),
711 				AD799X_CHANNEL(1, 10),
712 				AD799X_CHANNEL(2, 10),
713 				AD799X_CHANNEL(3, 10),
714 				AD799X_CHANNEL(4, 10),
715 				AD799X_CHANNEL(5, 10),
716 				AD799X_CHANNEL(6, 10),
717 				AD799X_CHANNEL(7, 10),
718 				IIO_CHAN_SOFT_TIMESTAMP(8),
719 			},
720 			.info = &ad7993_4_7_8_noirq_info,
721 		},
722 		.irq_config = {
723 			.channel = {
724 				AD799X_CHANNEL_WITH_EVENTS(0, 10),
725 				AD799X_CHANNEL_WITH_EVENTS(1, 10),
726 				AD799X_CHANNEL_WITH_EVENTS(2, 10),
727 				AD799X_CHANNEL_WITH_EVENTS(3, 10),
728 				AD799X_CHANNEL(4, 10),
729 				AD799X_CHANNEL(5, 10),
730 				AD799X_CHANNEL(6, 10),
731 				AD799X_CHANNEL(7, 10),
732 				IIO_CHAN_SOFT_TIMESTAMP(8),
733 			},
734 			.default_config = AD7998_ALERT_EN | AD7998_BUSY_ALERT,
735 			.info = &ad7993_4_7_8_irq_info,
736 		},
737 	},
738 	[ad7998] = {
739 		.num_channels = 9,
740 		.noirq_config = {
741 			.channel = {
742 				AD799X_CHANNEL(0, 12),
743 				AD799X_CHANNEL(1, 12),
744 				AD799X_CHANNEL(2, 12),
745 				AD799X_CHANNEL(3, 12),
746 				AD799X_CHANNEL(4, 12),
747 				AD799X_CHANNEL(5, 12),
748 				AD799X_CHANNEL(6, 12),
749 				AD799X_CHANNEL(7, 12),
750 				IIO_CHAN_SOFT_TIMESTAMP(8),
751 			},
752 			.info = &ad7993_4_7_8_noirq_info,
753 		},
754 		.irq_config = {
755 			.channel = {
756 				AD799X_CHANNEL_WITH_EVENTS(0, 12),
757 				AD799X_CHANNEL_WITH_EVENTS(1, 12),
758 				AD799X_CHANNEL_WITH_EVENTS(2, 12),
759 				AD799X_CHANNEL_WITH_EVENTS(3, 12),
760 				AD799X_CHANNEL(4, 12),
761 				AD799X_CHANNEL(5, 12),
762 				AD799X_CHANNEL(6, 12),
763 				AD799X_CHANNEL(7, 12),
764 				IIO_CHAN_SOFT_TIMESTAMP(8),
765 			},
766 			.default_config = AD7998_ALERT_EN | AD7998_BUSY_ALERT,
767 			.info = &ad7993_4_7_8_irq_info,
768 		},
769 	},
770 };
771 
772 static int ad799x_probe(struct i2c_client *client,
773 				   const struct i2c_device_id *id)
774 {
775 	int ret;
776 	struct ad799x_state *st;
777 	struct iio_dev *indio_dev;
778 	const struct ad799x_chip_info *chip_info =
779 		&ad799x_chip_info_tbl[id->driver_data];
780 
781 	indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*st));
782 	if (indio_dev == NULL)
783 		return -ENOMEM;
784 
785 	st = iio_priv(indio_dev);
786 	/* this is only used for device removal purposes */
787 	i2c_set_clientdata(client, indio_dev);
788 
789 	st->id = id->driver_data;
790 	if (client->irq > 0 && chip_info->irq_config.info)
791 		st->chip_config = &chip_info->irq_config;
792 	else
793 		st->chip_config = &chip_info->noirq_config;
794 
795 	/* TODO: Add pdata options for filtering and bit delay */
796 
797 	st->reg = devm_regulator_get(&client->dev, "vcc");
798 	if (IS_ERR(st->reg))
799 		return PTR_ERR(st->reg);
800 	ret = regulator_enable(st->reg);
801 	if (ret)
802 		return ret;
803 	st->vref = devm_regulator_get(&client->dev, "vref");
804 	if (IS_ERR(st->vref)) {
805 		ret = PTR_ERR(st->vref);
806 		goto error_disable_reg;
807 	}
808 	ret = regulator_enable(st->vref);
809 	if (ret)
810 		goto error_disable_reg;
811 
812 	st->client = client;
813 
814 	indio_dev->dev.parent = &client->dev;
815 	indio_dev->name = id->name;
816 	indio_dev->info = st->chip_config->info;
817 
818 	indio_dev->modes = INDIO_DIRECT_MODE;
819 	indio_dev->channels = st->chip_config->channel;
820 	indio_dev->num_channels = chip_info->num_channels;
821 
822 	ret = ad799x_write_config(st, st->chip_config->default_config);
823 	if (ret < 0)
824 		goto error_disable_reg;
825 	ret = ad799x_read_config(st);
826 	if (ret < 0)
827 		goto error_disable_reg;
828 	st->config = ret;
829 
830 	ret = iio_triggered_buffer_setup(indio_dev, NULL,
831 		&ad799x_trigger_handler, NULL);
832 	if (ret)
833 		goto error_disable_vref;
834 
835 	if (client->irq > 0) {
836 		ret = devm_request_threaded_irq(&client->dev,
837 						client->irq,
838 						NULL,
839 						ad799x_event_handler,
840 						IRQF_TRIGGER_FALLING |
841 						IRQF_ONESHOT,
842 						client->name,
843 						indio_dev);
844 		if (ret)
845 			goto error_cleanup_ring;
846 	}
847 	ret = iio_device_register(indio_dev);
848 	if (ret)
849 		goto error_cleanup_ring;
850 
851 	return 0;
852 
853 error_cleanup_ring:
854 	iio_triggered_buffer_cleanup(indio_dev);
855 error_disable_vref:
856 	regulator_disable(st->vref);
857 error_disable_reg:
858 	regulator_disable(st->reg);
859 
860 	return ret;
861 }
862 
863 static int ad799x_remove(struct i2c_client *client)
864 {
865 	struct iio_dev *indio_dev = i2c_get_clientdata(client);
866 	struct ad799x_state *st = iio_priv(indio_dev);
867 
868 	iio_device_unregister(indio_dev);
869 
870 	iio_triggered_buffer_cleanup(indio_dev);
871 	regulator_disable(st->vref);
872 	regulator_disable(st->reg);
873 	kfree(st->rx_buf);
874 
875 	return 0;
876 }
877 
878 static const struct i2c_device_id ad799x_id[] = {
879 	{ "ad7991", ad7991 },
880 	{ "ad7995", ad7995 },
881 	{ "ad7999", ad7999 },
882 	{ "ad7992", ad7992 },
883 	{ "ad7993", ad7993 },
884 	{ "ad7994", ad7994 },
885 	{ "ad7997", ad7997 },
886 	{ "ad7998", ad7998 },
887 	{}
888 };
889 
890 MODULE_DEVICE_TABLE(i2c, ad799x_id);
891 
892 static struct i2c_driver ad799x_driver = {
893 	.driver = {
894 		.name = "ad799x",
895 	},
896 	.probe = ad799x_probe,
897 	.remove = ad799x_remove,
898 	.id_table = ad799x_id,
899 };
900 module_i2c_driver(ad799x_driver);
901 
902 MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>");
903 MODULE_DESCRIPTION("Analog Devices AD799x ADC");
904 MODULE_LICENSE("GPL v2");
905