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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
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
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
87
88
89#define AD7997_8_READ_SINGLE BIT(7)
90#define AD7997_8_READ_SEQUENCE (BIT(6) | BIT(5) | BIT(4))
91
92enum {
93 ad7991,
94 ad7995,
95 ad7999,
96 ad7992,
97 ad7993,
98 ad7994,
99 ad7997,
100 ad7998
101};
102
103
104
105
106
107
108
109struct 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
117
118
119
120
121struct 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
127struct 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
139static 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
152static 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
165
166
167
168
169static 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());
205out:
206 iio_trigger_notify_done(indio_dev->trig);
207
208 return IRQ_HANDLED;
209}
210
211static 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
237static 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
263static 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}
296static 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
306static 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
320static 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
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
356error_ret_mutex:
357 mutex_unlock(&indio_dev->mlock);
358
359 return ret;
360}
361
362static 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
378static 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
405done:
406 mutex_unlock(&indio_dev->mlock);
407
408 return ret;
409}
410
411static 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
430static 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
452static 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
474static 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
503done:
504 return IRQ_HANDLED;
505}
506
507static IIO_DEV_ATTR_SAMP_FREQ(S_IWUSR | S_IRUGO,
508 ad799x_read_frequency,
509 ad799x_write_frequency);
510static IIO_CONST_ATTR_SAMP_FREQ_AVAIL("15625 7812 3906 1953 976 488 244 0");
511
512static 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
518static struct attribute_group ad799x_event_attrs_group = {
519 .attrs = ad799x_event_attributes,
520 .name = "events",
521};
522
523static const struct iio_info ad7991_info = {
524 .read_raw = &ad799x_read_raw,
525 .driver_module = THIS_MODULE,
526};
527
528static 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
534static 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
545static 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
588static 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
762static 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
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
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
843error_cleanup_ring:
844 iio_triggered_buffer_cleanup(indio_dev);
845error_disable_vref:
846 regulator_disable(st->vref);
847error_disable_reg:
848 regulator_disable(st->reg);
849
850 return ret;
851}
852
853static 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
868static 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
880MODULE_DEVICE_TABLE(i2c, ad799x_id);
881
882static 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};
890module_i2c_driver(ad799x_driver);
891
892MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>");
893MODULE_DESCRIPTION("Analog Devices AD799x ADC");
894MODULE_LICENSE("GPL v2");
895
