xref: /openbmc/linux/drivers/iio/adc/ad799x.c (revision 6774def6)
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 	default:
147 		return i2c_smbus_write_byte_data(st->client, AD7998_CONF_REG,
148 			val);
149 	}
150 }
151 
152 static int ad799x_read_config(struct ad799x_state *st)
153 {
154 	switch (st->id) {
155 	case ad7997:
156 	case ad7998:
157 		return i2c_smbus_read_word_swapped(st->client, AD7998_CONF_REG);
158 	default:
159 		return i2c_smbus_read_byte_data(st->client, AD7998_CONF_REG);
160 	}
161 }
162 
163 /**
164  * ad799x_trigger_handler() bh of trigger launched polling to ring buffer
165  *
166  * Currently there is no option in this driver to disable the saving of
167  * timestamps within the ring.
168  **/
169 static irqreturn_t ad799x_trigger_handler(int irq, void *p)
170 {
171 	struct iio_poll_func *pf = p;
172 	struct iio_dev *indio_dev = pf->indio_dev;
173 	struct ad799x_state *st = iio_priv(indio_dev);
174 	int b_sent;
175 	u8 cmd;
176 
177 	switch (st->id) {
178 	case ad7991:
179 	case ad7995:
180 	case ad7999:
181 		cmd = st->config |
182 			(*indio_dev->active_scan_mask << AD799X_CHANNEL_SHIFT);
183 		break;
184 	case ad7992:
185 	case ad7993:
186 	case ad7994:
187 		cmd = (*indio_dev->active_scan_mask << AD799X_CHANNEL_SHIFT) |
188 			AD7998_CONV_RES_REG;
189 		break;
190 	case ad7997:
191 	case ad7998:
192 		cmd = AD7997_8_READ_SEQUENCE | AD7998_CONV_RES_REG;
193 		break;
194 	default:
195 		cmd = 0;
196 	}
197 
198 	b_sent = i2c_smbus_read_i2c_block_data(st->client,
199 			cmd, st->transfer_size, st->rx_buf);
200 	if (b_sent < 0)
201 		goto out;
202 
203 	iio_push_to_buffers_with_timestamp(indio_dev, st->rx_buf,
204 			iio_get_time_ns());
205 out:
206 	iio_trigger_notify_done(indio_dev->trig);
207 
208 	return IRQ_HANDLED;
209 }
210 
211 static int ad799x_update_scan_mode(struct iio_dev *indio_dev,
212 	const unsigned long *scan_mask)
213 {
214 	struct ad799x_state *st = iio_priv(indio_dev);
215 
216 	kfree(st->rx_buf);
217 	st->rx_buf = kmalloc(indio_dev->scan_bytes, GFP_KERNEL);
218 	if (!st->rx_buf)
219 		return -ENOMEM;
220 
221 	st->transfer_size = bitmap_weight(scan_mask, indio_dev->masklength) * 2;
222 
223 	switch (st->id) {
224 	case ad7992:
225 	case ad7993:
226 	case ad7994:
227 	case ad7997:
228 	case ad7998:
229 		st->config &= ~(GENMASK(7, 0) << AD799X_CHANNEL_SHIFT);
230 		st->config |= (*scan_mask << AD799X_CHANNEL_SHIFT);
231 		return ad799x_write_config(st, st->config);
232 	default:
233 		return 0;
234 	}
235 }
236 
237 static int ad799x_scan_direct(struct ad799x_state *st, unsigned ch)
238 {
239 	u8 cmd;
240 
241 	switch (st->id) {
242 	case ad7991:
243 	case ad7995:
244 	case ad7999:
245 		cmd = st->config | (BIT(ch) << AD799X_CHANNEL_SHIFT);
246 		break;
247 	case ad7992:
248 	case ad7993:
249 	case ad7994:
250 		cmd = BIT(ch) << AD799X_CHANNEL_SHIFT;
251 		break;
252 	case ad7997:
253 	case ad7998:
254 		cmd = (ch << AD799X_CHANNEL_SHIFT) | AD7997_8_READ_SINGLE;
255 		break;
256 	default:
257 		return -EINVAL;
258 	}
259 
260 	return i2c_smbus_read_word_swapped(st->client, cmd);
261 }
262 
263 static int ad799x_read_raw(struct iio_dev *indio_dev,
264 			   struct iio_chan_spec const *chan,
265 			   int *val,
266 			   int *val2,
267 			   long m)
268 {
269 	int ret;
270 	struct ad799x_state *st = iio_priv(indio_dev);
271 
272 	switch (m) {
273 	case IIO_CHAN_INFO_RAW:
274 		mutex_lock(&indio_dev->mlock);
275 		if (iio_buffer_enabled(indio_dev))
276 			ret = -EBUSY;
277 		else
278 			ret = ad799x_scan_direct(st, chan->scan_index);
279 		mutex_unlock(&indio_dev->mlock);
280 
281 		if (ret < 0)
282 			return ret;
283 		*val = (ret >> chan->scan_type.shift) &
284 			GENMASK(chan->scan_type.realbits - 1, 0);
285 		return IIO_VAL_INT;
286 	case IIO_CHAN_INFO_SCALE:
287 		ret = regulator_get_voltage(st->vref);
288 		if (ret < 0)
289 			return ret;
290 		*val = ret / 1000;
291 		*val2 = chan->scan_type.realbits;
292 		return IIO_VAL_FRACTIONAL_LOG2;
293 	}
294 	return -EINVAL;
295 }
296 static const unsigned int ad7998_frequencies[] = {
297 	[AD7998_CYC_DIS]	= 0,
298 	[AD7998_CYC_TCONF_32]	= 15625,
299 	[AD7998_CYC_TCONF_64]	= 7812,
300 	[AD7998_CYC_TCONF_128]	= 3906,
301 	[AD7998_CYC_TCONF_512]	= 976,
302 	[AD7998_CYC_TCONF_1024]	= 488,
303 	[AD7998_CYC_TCONF_2048]	= 244,
304 };
305 
306 static ssize_t ad799x_read_frequency(struct device *dev,
307 					struct device_attribute *attr,
308 					char *buf)
309 {
310 	struct iio_dev *indio_dev = dev_to_iio_dev(dev);
311 	struct ad799x_state *st = iio_priv(indio_dev);
312 
313 	int ret = i2c_smbus_read_byte_data(st->client, AD7998_CYCLE_TMR_REG);
314 	if (ret < 0)
315 		return ret;
316 
317 	return sprintf(buf, "%u\n", ad7998_frequencies[ret & AD7998_CYC_MASK]);
318 }
319 
320 static ssize_t ad799x_write_frequency(struct device *dev,
321 					 struct device_attribute *attr,
322 					 const char *buf,
323 					 size_t len)
324 {
325 	struct iio_dev *indio_dev = dev_to_iio_dev(dev);
326 	struct ad799x_state *st = iio_priv(indio_dev);
327 
328 	long val;
329 	int ret, i;
330 
331 	ret = kstrtol(buf, 10, &val);
332 	if (ret)
333 		return ret;
334 
335 	mutex_lock(&indio_dev->mlock);
336 	ret = i2c_smbus_read_byte_data(st->client, AD7998_CYCLE_TMR_REG);
337 	if (ret < 0)
338 		goto error_ret_mutex;
339 	/* Wipe the bits clean */
340 	ret &= ~AD7998_CYC_MASK;
341 
342 	for (i = 0; i < ARRAY_SIZE(ad7998_frequencies); i++)
343 		if (val == ad7998_frequencies[i])
344 			break;
345 	if (i == ARRAY_SIZE(ad7998_frequencies)) {
346 		ret = -EINVAL;
347 		goto error_ret_mutex;
348 	}
349 
350 	ret = i2c_smbus_write_byte_data(st->client, AD7998_CYCLE_TMR_REG,
351 		ret | i);
352 	if (ret < 0)
353 		goto error_ret_mutex;
354 	ret = len;
355 
356 error_ret_mutex:
357 	mutex_unlock(&indio_dev->mlock);
358 
359 	return ret;
360 }
361 
362 static int ad799x_read_event_config(struct iio_dev *indio_dev,
363 				    const struct iio_chan_spec *chan,
364 				    enum iio_event_type type,
365 				    enum iio_event_direction dir)
366 {
367 	struct ad799x_state *st = iio_priv(indio_dev);
368 
369 	if (!(st->config & AD7998_ALERT_EN))
370 		return 0;
371 
372 	if ((st->config >> AD799X_CHANNEL_SHIFT) & BIT(chan->scan_index))
373 		return 1;
374 
375 	return 0;
376 }
377 
378 static int ad799x_write_event_config(struct iio_dev *indio_dev,
379 				     const struct iio_chan_spec *chan,
380 				     enum iio_event_type type,
381 				     enum iio_event_direction dir,
382 				     int state)
383 {
384 	struct ad799x_state *st = iio_priv(indio_dev);
385 	int ret;
386 
387 	mutex_lock(&indio_dev->mlock);
388 	if (iio_buffer_enabled(indio_dev)) {
389 		ret = -EBUSY;
390 		goto done;
391 	}
392 
393 	if (state)
394 		st->config |= BIT(chan->scan_index) << AD799X_CHANNEL_SHIFT;
395 	else
396 		st->config &= ~(BIT(chan->scan_index) << AD799X_CHANNEL_SHIFT);
397 
398 	if (st->config >> AD799X_CHANNEL_SHIFT)
399 		st->config |= AD7998_ALERT_EN;
400 	else
401 		st->config &= ~AD7998_ALERT_EN;
402 
403 	ret = ad799x_write_config(st, st->config);
404 
405 done:
406 	mutex_unlock(&indio_dev->mlock);
407 
408 	return ret;
409 }
410 
411 static unsigned int ad799x_threshold_reg(const struct iio_chan_spec *chan,
412 					 enum iio_event_direction dir,
413 					 enum iio_event_info info)
414 {
415 	switch (info) {
416 	case IIO_EV_INFO_VALUE:
417 		if (dir == IIO_EV_DIR_FALLING)
418 			return AD7998_DATALOW_REG(chan->channel);
419 		else
420 			return AD7998_DATAHIGH_REG(chan->channel);
421 	case IIO_EV_INFO_HYSTERESIS:
422 		return AD7998_HYST_REG(chan->channel);
423 	default:
424 		return -EINVAL;
425 	}
426 
427 	return 0;
428 }
429 
430 static int ad799x_write_event_value(struct iio_dev *indio_dev,
431 				    const struct iio_chan_spec *chan,
432 				    enum iio_event_type type,
433 				    enum iio_event_direction dir,
434 				    enum iio_event_info info,
435 				    int val, int val2)
436 {
437 	int ret;
438 	struct ad799x_state *st = iio_priv(indio_dev);
439 
440 	if (val < 0 || val > GENMASK(chan->scan_type.realbits - 1, 0))
441 		return -EINVAL;
442 
443 	mutex_lock(&indio_dev->mlock);
444 	ret = i2c_smbus_write_word_swapped(st->client,
445 		ad799x_threshold_reg(chan, dir, info),
446 		val << chan->scan_type.shift);
447 	mutex_unlock(&indio_dev->mlock);
448 
449 	return ret;
450 }
451 
452 static int ad799x_read_event_value(struct iio_dev *indio_dev,
453 				    const struct iio_chan_spec *chan,
454 				    enum iio_event_type type,
455 				    enum iio_event_direction dir,
456 				    enum iio_event_info info,
457 				    int *val, int *val2)
458 {
459 	int ret;
460 	struct ad799x_state *st = iio_priv(indio_dev);
461 
462 	mutex_lock(&indio_dev->mlock);
463 	ret = i2c_smbus_read_word_swapped(st->client,
464 		ad799x_threshold_reg(chan, dir, info));
465 	mutex_unlock(&indio_dev->mlock);
466 	if (ret < 0)
467 		return ret;
468 	*val = (ret >> chan->scan_type.shift) &
469 		GENMASK(chan->scan_type.realbits - 1 , 0);
470 
471 	return IIO_VAL_INT;
472 }
473 
474 static irqreturn_t ad799x_event_handler(int irq, void *private)
475 {
476 	struct iio_dev *indio_dev = private;
477 	struct ad799x_state *st = iio_priv(private);
478 	int i, ret;
479 
480 	ret = i2c_smbus_read_byte_data(st->client, AD7998_ALERT_STAT_REG);
481 	if (ret <= 0)
482 		goto done;
483 
484 	if (i2c_smbus_write_byte_data(st->client, AD7998_ALERT_STAT_REG,
485 		AD7998_ALERT_STAT_CLEAR) < 0)
486 		goto done;
487 
488 	for (i = 0; i < 8; i++) {
489 		if (ret & BIT(i))
490 			iio_push_event(indio_dev,
491 				       i & 0x1 ?
492 				       IIO_UNMOD_EVENT_CODE(IIO_VOLTAGE,
493 							    (i >> 1),
494 							    IIO_EV_TYPE_THRESH,
495 							    IIO_EV_DIR_RISING) :
496 				       IIO_UNMOD_EVENT_CODE(IIO_VOLTAGE,
497 							    (i >> 1),
498 							    IIO_EV_TYPE_THRESH,
499 							    IIO_EV_DIR_FALLING),
500 				       iio_get_time_ns());
501 	}
502 
503 done:
504 	return IRQ_HANDLED;
505 }
506 
507 static IIO_DEV_ATTR_SAMP_FREQ(S_IWUSR | S_IRUGO,
508 			      ad799x_read_frequency,
509 			      ad799x_write_frequency);
510 static IIO_CONST_ATTR_SAMP_FREQ_AVAIL("15625 7812 3906 1953 976 488 244 0");
511 
512 static struct attribute *ad799x_event_attributes[] = {
513 	&iio_dev_attr_sampling_frequency.dev_attr.attr,
514 	&iio_const_attr_sampling_frequency_available.dev_attr.attr,
515 	NULL,
516 };
517 
518 static struct attribute_group ad799x_event_attrs_group = {
519 	.attrs = ad799x_event_attributes,
520 	.name = "events",
521 };
522 
523 static const struct iio_info ad7991_info = {
524 	.read_raw = &ad799x_read_raw,
525 	.driver_module = THIS_MODULE,
526 };
527 
528 static const struct iio_info ad7993_4_7_8_noirq_info = {
529 	.read_raw = &ad799x_read_raw,
530 	.driver_module = THIS_MODULE,
531 	.update_scan_mode = ad799x_update_scan_mode,
532 };
533 
534 static const struct iio_info ad7993_4_7_8_irq_info = {
535 	.read_raw = &ad799x_read_raw,
536 	.event_attrs = &ad799x_event_attrs_group,
537 	.read_event_config = &ad799x_read_event_config,
538 	.write_event_config = &ad799x_write_event_config,
539 	.read_event_value = &ad799x_read_event_value,
540 	.write_event_value = &ad799x_write_event_value,
541 	.driver_module = THIS_MODULE,
542 	.update_scan_mode = ad799x_update_scan_mode,
543 };
544 
545 static const struct iio_event_spec ad799x_events[] = {
546 	{
547 		.type = IIO_EV_TYPE_THRESH,
548 		.dir = IIO_EV_DIR_RISING,
549 		.mask_separate = BIT(IIO_EV_INFO_VALUE) |
550 			BIT(IIO_EV_INFO_ENABLE),
551 	}, {
552 		.type = IIO_EV_TYPE_THRESH,
553 		.dir = IIO_EV_DIR_FALLING,
554 		.mask_separate = BIT(IIO_EV_INFO_VALUE) |
555 			BIT(IIO_EV_INFO_ENABLE),
556 	}, {
557 		.type = IIO_EV_TYPE_THRESH,
558 		.dir = IIO_EV_DIR_EITHER,
559 		.mask_separate = BIT(IIO_EV_INFO_HYSTERESIS),
560 	},
561 };
562 
563 #define _AD799X_CHANNEL(_index, _realbits, _ev_spec, _num_ev_spec) { \
564 	.type = IIO_VOLTAGE, \
565 	.indexed = 1, \
566 	.channel = (_index), \
567 	.info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \
568 	.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE), \
569 	.scan_index = (_index), \
570 	.scan_type = { \
571 		.sign = 'u', \
572 		.realbits = (_realbits), \
573 		.storagebits = 16, \
574 		.shift = 12 - (_realbits), \
575 		.endianness = IIO_BE, \
576 	}, \
577 	.event_spec = _ev_spec, \
578 	.num_event_specs = _num_ev_spec, \
579 }
580 
581 #define AD799X_CHANNEL(_index, _realbits) \
582 	_AD799X_CHANNEL(_index, _realbits, NULL, 0)
583 
584 #define AD799X_CHANNEL_WITH_EVENTS(_index, _realbits) \
585 	_AD799X_CHANNEL(_index, _realbits, ad799x_events, \
586 		ARRAY_SIZE(ad799x_events))
587 
588 static const struct ad799x_chip_info ad799x_chip_info_tbl[] = {
589 	[ad7991] = {
590 		.num_channels = 5,
591 		.noirq_config = {
592 			.channel = {
593 				AD799X_CHANNEL(0, 12),
594 				AD799X_CHANNEL(1, 12),
595 				AD799X_CHANNEL(2, 12),
596 				AD799X_CHANNEL(3, 12),
597 				IIO_CHAN_SOFT_TIMESTAMP(4),
598 			},
599 			.info = &ad7991_info,
600 		},
601 	},
602 	[ad7995] = {
603 		.num_channels = 5,
604 		.noirq_config = {
605 			.channel = {
606 				AD799X_CHANNEL(0, 10),
607 				AD799X_CHANNEL(1, 10),
608 				AD799X_CHANNEL(2, 10),
609 				AD799X_CHANNEL(3, 10),
610 				IIO_CHAN_SOFT_TIMESTAMP(4),
611 			},
612 			.info = &ad7991_info,
613 		},
614 	},
615 	[ad7999] = {
616 		.num_channels = 5,
617 		.noirq_config = {
618 			.channel = {
619 				AD799X_CHANNEL(0, 8),
620 				AD799X_CHANNEL(1, 8),
621 				AD799X_CHANNEL(2, 8),
622 				AD799X_CHANNEL(3, 8),
623 				IIO_CHAN_SOFT_TIMESTAMP(4),
624 			},
625 			.info = &ad7991_info,
626 		},
627 	},
628 	[ad7992] = {
629 		.num_channels = 3,
630 		.noirq_config = {
631 			.channel = {
632 				AD799X_CHANNEL(0, 12),
633 				AD799X_CHANNEL(1, 12),
634 				IIO_CHAN_SOFT_TIMESTAMP(3),
635 			},
636 			.info = &ad7993_4_7_8_noirq_info,
637 		},
638 		.irq_config = {
639 			.channel = {
640 				AD799X_CHANNEL_WITH_EVENTS(0, 12),
641 				AD799X_CHANNEL_WITH_EVENTS(1, 12),
642 				IIO_CHAN_SOFT_TIMESTAMP(3),
643 			},
644 			.default_config = AD7998_ALERT_EN | AD7998_BUSY_ALERT,
645 			.info = &ad7993_4_7_8_irq_info,
646 		},
647 	},
648 	[ad7993] = {
649 		.num_channels = 5,
650 		.noirq_config = {
651 			.channel = {
652 				AD799X_CHANNEL(0, 10),
653 				AD799X_CHANNEL(1, 10),
654 				AD799X_CHANNEL(2, 10),
655 				AD799X_CHANNEL(3, 10),
656 				IIO_CHAN_SOFT_TIMESTAMP(4),
657 			},
658 			.info = &ad7993_4_7_8_noirq_info,
659 		},
660 		.irq_config = {
661 			.channel = {
662 				AD799X_CHANNEL_WITH_EVENTS(0, 10),
663 				AD799X_CHANNEL_WITH_EVENTS(1, 10),
664 				AD799X_CHANNEL_WITH_EVENTS(2, 10),
665 				AD799X_CHANNEL_WITH_EVENTS(3, 10),
666 				IIO_CHAN_SOFT_TIMESTAMP(4),
667 			},
668 			.default_config = AD7998_ALERT_EN | AD7998_BUSY_ALERT,
669 			.info = &ad7993_4_7_8_irq_info,
670 		},
671 	},
672 	[ad7994] = {
673 		.num_channels = 5,
674 		.noirq_config = {
675 			.channel = {
676 				AD799X_CHANNEL(0, 12),
677 				AD799X_CHANNEL(1, 12),
678 				AD799X_CHANNEL(2, 12),
679 				AD799X_CHANNEL(3, 12),
680 				IIO_CHAN_SOFT_TIMESTAMP(4),
681 			},
682 			.info = &ad7993_4_7_8_noirq_info,
683 		},
684 		.irq_config = {
685 			.channel = {
686 				AD799X_CHANNEL_WITH_EVENTS(0, 12),
687 				AD799X_CHANNEL_WITH_EVENTS(1, 12),
688 				AD799X_CHANNEL_WITH_EVENTS(2, 12),
689 				AD799X_CHANNEL_WITH_EVENTS(3, 12),
690 				IIO_CHAN_SOFT_TIMESTAMP(4),
691 			},
692 			.default_config = AD7998_ALERT_EN | AD7998_BUSY_ALERT,
693 			.info = &ad7993_4_7_8_irq_info,
694 		},
695 	},
696 	[ad7997] = {
697 		.num_channels = 9,
698 		.noirq_config = {
699 			.channel = {
700 				AD799X_CHANNEL(0, 10),
701 				AD799X_CHANNEL(1, 10),
702 				AD799X_CHANNEL(2, 10),
703 				AD799X_CHANNEL(3, 10),
704 				AD799X_CHANNEL(4, 10),
705 				AD799X_CHANNEL(5, 10),
706 				AD799X_CHANNEL(6, 10),
707 				AD799X_CHANNEL(7, 10),
708 				IIO_CHAN_SOFT_TIMESTAMP(8),
709 			},
710 			.info = &ad7993_4_7_8_noirq_info,
711 		},
712 		.irq_config = {
713 			.channel = {
714 				AD799X_CHANNEL_WITH_EVENTS(0, 10),
715 				AD799X_CHANNEL_WITH_EVENTS(1, 10),
716 				AD799X_CHANNEL_WITH_EVENTS(2, 10),
717 				AD799X_CHANNEL_WITH_EVENTS(3, 10),
718 				AD799X_CHANNEL(4, 10),
719 				AD799X_CHANNEL(5, 10),
720 				AD799X_CHANNEL(6, 10),
721 				AD799X_CHANNEL(7, 10),
722 				IIO_CHAN_SOFT_TIMESTAMP(8),
723 			},
724 			.default_config = AD7998_ALERT_EN | AD7998_BUSY_ALERT,
725 			.info = &ad7993_4_7_8_irq_info,
726 		},
727 	},
728 	[ad7998] = {
729 		.num_channels = 9,
730 		.noirq_config = {
731 			.channel = {
732 				AD799X_CHANNEL(0, 12),
733 				AD799X_CHANNEL(1, 12),
734 				AD799X_CHANNEL(2, 12),
735 				AD799X_CHANNEL(3, 12),
736 				AD799X_CHANNEL(4, 12),
737 				AD799X_CHANNEL(5, 12),
738 				AD799X_CHANNEL(6, 12),
739 				AD799X_CHANNEL(7, 12),
740 				IIO_CHAN_SOFT_TIMESTAMP(8),
741 			},
742 			.info = &ad7993_4_7_8_noirq_info,
743 		},
744 		.irq_config = {
745 			.channel = {
746 				AD799X_CHANNEL_WITH_EVENTS(0, 12),
747 				AD799X_CHANNEL_WITH_EVENTS(1, 12),
748 				AD799X_CHANNEL_WITH_EVENTS(2, 12),
749 				AD799X_CHANNEL_WITH_EVENTS(3, 12),
750 				AD799X_CHANNEL(4, 12),
751 				AD799X_CHANNEL(5, 12),
752 				AD799X_CHANNEL(6, 12),
753 				AD799X_CHANNEL(7, 12),
754 				IIO_CHAN_SOFT_TIMESTAMP(8),
755 			},
756 			.default_config = AD7998_ALERT_EN | AD7998_BUSY_ALERT,
757 			.info = &ad7993_4_7_8_irq_info,
758 		},
759 	},
760 };
761 
762 static int ad799x_probe(struct i2c_client *client,
763 				   const struct i2c_device_id *id)
764 {
765 	int ret;
766 	struct ad799x_state *st;
767 	struct iio_dev *indio_dev;
768 	const struct ad799x_chip_info *chip_info =
769 		&ad799x_chip_info_tbl[id->driver_data];
770 
771 	indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*st));
772 	if (indio_dev == NULL)
773 		return -ENOMEM;
774 
775 	st = iio_priv(indio_dev);
776 	/* this is only used for device removal purposes */
777 	i2c_set_clientdata(client, indio_dev);
778 
779 	st->id = id->driver_data;
780 	if (client->irq > 0 && chip_info->irq_config.info)
781 		st->chip_config = &chip_info->irq_config;
782 	else
783 		st->chip_config = &chip_info->noirq_config;
784 
785 	/* TODO: Add pdata options for filtering and bit delay */
786 
787 	st->reg = devm_regulator_get(&client->dev, "vcc");
788 	if (IS_ERR(st->reg))
789 		return PTR_ERR(st->reg);
790 	ret = regulator_enable(st->reg);
791 	if (ret)
792 		return ret;
793 	st->vref = devm_regulator_get(&client->dev, "vref");
794 	if (IS_ERR(st->vref)) {
795 		ret = PTR_ERR(st->vref);
796 		goto error_disable_reg;
797 	}
798 	ret = regulator_enable(st->vref);
799 	if (ret)
800 		goto error_disable_reg;
801 
802 	st->client = client;
803 
804 	indio_dev->dev.parent = &client->dev;
805 	indio_dev->name = id->name;
806 	indio_dev->info = st->chip_config->info;
807 
808 	indio_dev->modes = INDIO_DIRECT_MODE;
809 	indio_dev->channels = st->chip_config->channel;
810 	indio_dev->num_channels = chip_info->num_channels;
811 
812 	ret = ad799x_write_config(st, st->chip_config->default_config);
813 	if (ret < 0)
814 		goto error_disable_reg;
815 	ret = ad799x_read_config(st);
816 	if (ret < 0)
817 		goto error_disable_reg;
818 	st->config = ret;
819 
820 	ret = iio_triggered_buffer_setup(indio_dev, NULL,
821 		&ad799x_trigger_handler, NULL);
822 	if (ret)
823 		goto error_disable_vref;
824 
825 	if (client->irq > 0) {
826 		ret = devm_request_threaded_irq(&client->dev,
827 						client->irq,
828 						NULL,
829 						ad799x_event_handler,
830 						IRQF_TRIGGER_FALLING |
831 						IRQF_ONESHOT,
832 						client->name,
833 						indio_dev);
834 		if (ret)
835 			goto error_cleanup_ring;
836 	}
837 	ret = iio_device_register(indio_dev);
838 	if (ret)
839 		goto error_cleanup_ring;
840 
841 	return 0;
842 
843 error_cleanup_ring:
844 	iio_triggered_buffer_cleanup(indio_dev);
845 error_disable_vref:
846 	regulator_disable(st->vref);
847 error_disable_reg:
848 	regulator_disable(st->reg);
849 
850 	return ret;
851 }
852 
853 static int ad799x_remove(struct i2c_client *client)
854 {
855 	struct iio_dev *indio_dev = i2c_get_clientdata(client);
856 	struct ad799x_state *st = iio_priv(indio_dev);
857 
858 	iio_device_unregister(indio_dev);
859 
860 	iio_triggered_buffer_cleanup(indio_dev);
861 	regulator_disable(st->vref);
862 	regulator_disable(st->reg);
863 	kfree(st->rx_buf);
864 
865 	return 0;
866 }
867 
868 static const struct i2c_device_id ad799x_id[] = {
869 	{ "ad7991", ad7991 },
870 	{ "ad7995", ad7995 },
871 	{ "ad7999", ad7999 },
872 	{ "ad7992", ad7992 },
873 	{ "ad7993", ad7993 },
874 	{ "ad7994", ad7994 },
875 	{ "ad7997", ad7997 },
876 	{ "ad7998", ad7998 },
877 	{}
878 };
879 
880 MODULE_DEVICE_TABLE(i2c, ad799x_id);
881 
882 static struct i2c_driver ad799x_driver = {
883 	.driver = {
884 		.name = "ad799x",
885 	},
886 	.probe = ad799x_probe,
887 	.remove = ad799x_remove,
888 	.id_table = ad799x_id,
889 };
890 module_i2c_driver(ad799x_driver);
891 
892 MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>");
893 MODULE_DESCRIPTION("Analog Devices AD799x ADC");
894 MODULE_LICENSE("GPL v2");
895