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sh_eth: fix EESIPR values for SH77{34|63}
[linux/fpc-iii.git] / drivers / iio / adc / ad799x.c
blob9704090b79084f3206703c248aed3d774831744f
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(indio_dev));
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 ret = iio_device_claim_direct_mode(indio_dev);
286 if (ret)
287 return ret;
288 ret = ad799x_scan_direct(st, chan->scan_index);
289 iio_device_release_direct_mode(indio_dev);
290
291 if (ret < 0)
292 return ret;
293 *val = (ret >> chan->scan_type.shift) &
294 GENMASK(chan->scan_type.realbits - 1, 0);
295 return IIO_VAL_INT;
296 case IIO_CHAN_INFO_SCALE:
297 ret = regulator_get_voltage(st->vref);
298 if (ret < 0)
299 return ret;
300 *val = ret / 1000;
301 *val2 = chan->scan_type.realbits;
302 return IIO_VAL_FRACTIONAL_LOG2;
303 }
304 return -EINVAL;
305 }
306 static const unsigned int ad7998_frequencies[] = {
307 [AD7998_CYC_DIS] = 0,
308 [AD7998_CYC_TCONF_32] = 15625,
309 [AD7998_CYC_TCONF_64] = 7812,
310 [AD7998_CYC_TCONF_128] = 3906,
311 [AD7998_CYC_TCONF_512] = 976,
312 [AD7998_CYC_TCONF_1024] = 488,
313 [AD7998_CYC_TCONF_2048] = 244,
314 };
315
316 static ssize_t ad799x_read_frequency(struct device *dev,
317 struct device_attribute *attr,
318 char *buf)
319 {
320 struct iio_dev *indio_dev = dev_to_iio_dev(dev);
321 struct ad799x_state *st = iio_priv(indio_dev);
322
323 int ret = i2c_smbus_read_byte_data(st->client, AD7998_CYCLE_TMR_REG);
324 if (ret < 0)
325 return ret;
326
327 return sprintf(buf, "%u\n", ad7998_frequencies[ret & AD7998_CYC_MASK]);
328 }
329
330 static ssize_t ad799x_write_frequency(struct device *dev,
331 struct device_attribute *attr,
332 const char *buf,
333 size_t len)
334 {
335 struct iio_dev *indio_dev = dev_to_iio_dev(dev);
336 struct ad799x_state *st = iio_priv(indio_dev);
337
338 long val;
339 int ret, i;
340
341 ret = kstrtol(buf, 10, &val);
342 if (ret)
343 return ret;
344
345 mutex_lock(&indio_dev->mlock);
346 ret = i2c_smbus_read_byte_data(st->client, AD7998_CYCLE_TMR_REG);
347 if (ret < 0)
348 goto error_ret_mutex;
349 /* Wipe the bits clean */
350 ret &= ~AD7998_CYC_MASK;
351
352 for (i = 0; i < ARRAY_SIZE(ad7998_frequencies); i++)
353 if (val == ad7998_frequencies[i])
354 break;
355 if (i == ARRAY_SIZE(ad7998_frequencies)) {
356 ret = -EINVAL;
357 goto error_ret_mutex;
358 }
359
360 ret = i2c_smbus_write_byte_data(st->client, AD7998_CYCLE_TMR_REG,
361 ret | i);
362 if (ret < 0)
363 goto error_ret_mutex;
364 ret = len;
365
366 error_ret_mutex:
367 mutex_unlock(&indio_dev->mlock);
368
369 return ret;
370 }
371
372 static int ad799x_read_event_config(struct iio_dev *indio_dev,
373 const struct iio_chan_spec *chan,
374 enum iio_event_type type,
375 enum iio_event_direction dir)
376 {
377 struct ad799x_state *st = iio_priv(indio_dev);
378
379 if (!(st->config & AD7998_ALERT_EN))
380 return 0;
381
382 if ((st->config >> AD799X_CHANNEL_SHIFT) & BIT(chan->scan_index))
383 return 1;
384
385 return 0;
386 }
387
388 static int ad799x_write_event_config(struct iio_dev *indio_dev,
389 const struct iio_chan_spec *chan,
390 enum iio_event_type type,
391 enum iio_event_direction dir,
392 int state)
393 {
394 struct ad799x_state *st = iio_priv(indio_dev);
395 int ret;
396
397 ret = iio_device_claim_direct_mode(indio_dev);
398 if (ret)
399 return ret;
400
401 if (state)
402 st->config |= BIT(chan->scan_index) << AD799X_CHANNEL_SHIFT;
403 else
404 st->config &= ~(BIT(chan->scan_index) << AD799X_CHANNEL_SHIFT);
405
406 if (st->config >> AD799X_CHANNEL_SHIFT)
407 st->config |= AD7998_ALERT_EN;
408 else
409 st->config &= ~AD7998_ALERT_EN;
410
411 ret = ad799x_write_config(st, st->config);
412 iio_device_release_direct_mode(indio_dev);
413 return ret;
414 }
415
416 static unsigned int ad799x_threshold_reg(const struct iio_chan_spec *chan,
417 enum iio_event_direction dir,
418 enum iio_event_info info)
419 {
420 switch (info) {
421 case IIO_EV_INFO_VALUE:
422 if (dir == IIO_EV_DIR_FALLING)
423 return AD7998_DATALOW_REG(chan->channel);
424 else
425 return AD7998_DATAHIGH_REG(chan->channel);
426 case IIO_EV_INFO_HYSTERESIS:
427 return AD7998_HYST_REG(chan->channel);
428 default:
429 return -EINVAL;
430 }
431
432 return 0;
433 }
434
435 static int ad799x_write_event_value(struct iio_dev *indio_dev,
436 const struct iio_chan_spec *chan,
437 enum iio_event_type type,
438 enum iio_event_direction dir,
439 enum iio_event_info info,
440 int val, int val2)
441 {
442 int ret;
443 struct ad799x_state *st = iio_priv(indio_dev);
444
445 if (val < 0 || val > GENMASK(chan->scan_type.realbits - 1, 0))
446 return -EINVAL;
447
448 mutex_lock(&indio_dev->mlock);
449 ret = i2c_smbus_write_word_swapped(st->client,
450 ad799x_threshold_reg(chan, dir, info),
451 val << chan->scan_type.shift);
452 mutex_unlock(&indio_dev->mlock);
453
454 return ret;
455 }
456
457 static int ad799x_read_event_value(struct iio_dev *indio_dev,
458 const struct iio_chan_spec *chan,
459 enum iio_event_type type,
460 enum iio_event_direction dir,
461 enum iio_event_info info,
462 int *val, int *val2)
463 {
464 int ret;
465 struct ad799x_state *st = iio_priv(indio_dev);
466
467 mutex_lock(&indio_dev->mlock);
468 ret = i2c_smbus_read_word_swapped(st->client,
469 ad799x_threshold_reg(chan, dir, info));
470 mutex_unlock(&indio_dev->mlock);
471 if (ret < 0)
472 return ret;
473 *val = (ret >> chan->scan_type.shift) &
474 GENMASK(chan->scan_type.realbits - 1, 0);
475
476 return IIO_VAL_INT;
477 }
478
479 static irqreturn_t ad799x_event_handler(int irq, void *private)
480 {
481 struct iio_dev *indio_dev = private;
482 struct ad799x_state *st = iio_priv(private);
483 int i, ret;
484
485 ret = i2c_smbus_read_byte_data(st->client, AD7998_ALERT_STAT_REG);
486 if (ret <= 0)
487 goto done;
488
489 if (i2c_smbus_write_byte_data(st->client, AD7998_ALERT_STAT_REG,
490 AD7998_ALERT_STAT_CLEAR) < 0)
491 goto done;
492
493 for (i = 0; i < 8; i++) {
494 if (ret & BIT(i))
495 iio_push_event(indio_dev,
496 i & 0x1 ?
497 IIO_UNMOD_EVENT_CODE(IIO_VOLTAGE,
498 (i >> 1),
499 IIO_EV_TYPE_THRESH,
500 IIO_EV_DIR_RISING) :
501 IIO_UNMOD_EVENT_CODE(IIO_VOLTAGE,
502 (i >> 1),
503 IIO_EV_TYPE_THRESH,
504 IIO_EV_DIR_FALLING),
505 iio_get_time_ns(indio_dev));
506 }
507
508 done:
509 return IRQ_HANDLED;
510 }
511
512 static IIO_DEV_ATTR_SAMP_FREQ(S_IWUSR | S_IRUGO,
513 ad799x_read_frequency,
514 ad799x_write_frequency);
515 static IIO_CONST_ATTR_SAMP_FREQ_AVAIL("15625 7812 3906 1953 976 488 244 0");
516
517 static struct attribute *ad799x_event_attributes[] = {
518 &iio_dev_attr_sampling_frequency.dev_attr.attr,
519 &iio_const_attr_sampling_frequency_available.dev_attr.attr,
520 NULL,
521 };
522
523 static struct attribute_group ad799x_event_attrs_group = {
524 .attrs = ad799x_event_attributes,
525 };
526
527 static const struct iio_info ad7991_info = {
528 .read_raw = &ad799x_read_raw,
529 .driver_module = THIS_MODULE,
530 .update_scan_mode = ad799x_update_scan_mode,
531 };
532
533 static const struct iio_info ad7993_4_7_8_noirq_info = {
534 .read_raw = &ad799x_read_raw,
535 .driver_module = THIS_MODULE,
536 .update_scan_mode = ad799x_update_scan_mode,
537 };
538
539 static const struct iio_info ad7993_4_7_8_irq_info = {
540 .read_raw = &ad799x_read_raw,
541 .event_attrs = &ad799x_event_attrs_group,
542 .read_event_config = &ad799x_read_event_config,
543 .write_event_config = &ad799x_write_event_config,
544 .read_event_value = &ad799x_read_event_value,
545 .write_event_value = &ad799x_write_event_value,
546 .driver_module = THIS_MODULE,
547 .update_scan_mode = ad799x_update_scan_mode,
548 };
549
550 static const struct iio_event_spec ad799x_events[] = {
551 {
552 .type = IIO_EV_TYPE_THRESH,
553 .dir = IIO_EV_DIR_RISING,
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_FALLING,
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_EITHER,
564 .mask_separate = BIT(IIO_EV_INFO_HYSTERESIS),
565 },
566 };
567
568 #define _AD799X_CHANNEL(_index, _realbits, _ev_spec, _num_ev_spec) { \
569 .type = IIO_VOLTAGE, \
570 .indexed = 1, \
571 .channel = (_index), \
572 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \
573 .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE), \
574 .scan_index = (_index), \
575 .scan_type = { \
576 .sign = 'u', \
577 .realbits = (_realbits), \
578 .storagebits = 16, \
579 .shift = 12 - (_realbits), \
580 .endianness = IIO_BE, \
581 }, \
582 .event_spec = _ev_spec, \
583 .num_event_specs = _num_ev_spec, \
584 }
585
586 #define AD799X_CHANNEL(_index, _realbits) \
587 _AD799X_CHANNEL(_index, _realbits, NULL, 0)
588
589 #define AD799X_CHANNEL_WITH_EVENTS(_index, _realbits) \
590 _AD799X_CHANNEL(_index, _realbits, ad799x_events, \
591 ARRAY_SIZE(ad799x_events))
592
593 static const struct ad799x_chip_info ad799x_chip_info_tbl[] = {
594 [ad7991] = {
595 .num_channels = 5,
596 .noirq_config = {
597 .channel = {
598 AD799X_CHANNEL(0, 12),
599 AD799X_CHANNEL(1, 12),
600 AD799X_CHANNEL(2, 12),
601 AD799X_CHANNEL(3, 12),
602 IIO_CHAN_SOFT_TIMESTAMP(4),
603 },
604 .info = &ad7991_info,
605 },
606 },
607 [ad7995] = {
608 .num_channels = 5,
609 .noirq_config = {
610 .channel = {
611 AD799X_CHANNEL(0, 10),
612 AD799X_CHANNEL(1, 10),
613 AD799X_CHANNEL(2, 10),
614 AD799X_CHANNEL(3, 10),
615 IIO_CHAN_SOFT_TIMESTAMP(4),
616 },
617 .info = &ad7991_info,
618 },
619 },
620 [ad7999] = {
621 .num_channels = 5,
622 .noirq_config = {
623 .channel = {
624 AD799X_CHANNEL(0, 8),
625 AD799X_CHANNEL(1, 8),
626 AD799X_CHANNEL(2, 8),
627 AD799X_CHANNEL(3, 8),
628 IIO_CHAN_SOFT_TIMESTAMP(4),
629 },
630 .info = &ad7991_info,
631 },
632 },
633 [ad7992] = {
634 .num_channels = 3,
635 .noirq_config = {
636 .channel = {
637 AD799X_CHANNEL(0, 12),
638 AD799X_CHANNEL(1, 12),
639 IIO_CHAN_SOFT_TIMESTAMP(3),
640 },
641 .info = &ad7993_4_7_8_noirq_info,
642 },
643 .irq_config = {
644 .channel = {
645 AD799X_CHANNEL_WITH_EVENTS(0, 12),
646 AD799X_CHANNEL_WITH_EVENTS(1, 12),
647 IIO_CHAN_SOFT_TIMESTAMP(3),
648 },
649 .default_config = AD7998_ALERT_EN | AD7998_BUSY_ALERT,
650 .info = &ad7993_4_7_8_irq_info,
651 },
652 },
653 [ad7993] = {
654 .num_channels = 5,
655 .noirq_config = {
656 .channel = {
657 AD799X_CHANNEL(0, 10),
658 AD799X_CHANNEL(1, 10),
659 AD799X_CHANNEL(2, 10),
660 AD799X_CHANNEL(3, 10),
661 IIO_CHAN_SOFT_TIMESTAMP(4),
662 },
663 .info = &ad7993_4_7_8_noirq_info,
664 },
665 .irq_config = {
666 .channel = {
667 AD799X_CHANNEL_WITH_EVENTS(0, 10),
668 AD799X_CHANNEL_WITH_EVENTS(1, 10),
669 AD799X_CHANNEL_WITH_EVENTS(2, 10),
670 AD799X_CHANNEL_WITH_EVENTS(3, 10),
671 IIO_CHAN_SOFT_TIMESTAMP(4),
672 },
673 .default_config = AD7998_ALERT_EN | AD7998_BUSY_ALERT,
674 .info = &ad7993_4_7_8_irq_info,
675 },
676 },
677 [ad7994] = {
678 .num_channels = 5,
679 .noirq_config = {
680 .channel = {
681 AD799X_CHANNEL(0, 12),
682 AD799X_CHANNEL(1, 12),
683 AD799X_CHANNEL(2, 12),
684 AD799X_CHANNEL(3, 12),
685 IIO_CHAN_SOFT_TIMESTAMP(4),
686 },
687 .info = &ad7993_4_7_8_noirq_info,
688 },
689 .irq_config = {
690 .channel = {
691 AD799X_CHANNEL_WITH_EVENTS(0, 12),
692 AD799X_CHANNEL_WITH_EVENTS(1, 12),
693 AD799X_CHANNEL_WITH_EVENTS(2, 12),
694 AD799X_CHANNEL_WITH_EVENTS(3, 12),
695 IIO_CHAN_SOFT_TIMESTAMP(4),
696 },
697 .default_config = AD7998_ALERT_EN | AD7998_BUSY_ALERT,
698 .info = &ad7993_4_7_8_irq_info,
699 },
700 },
701 [ad7997] = {
702 .num_channels = 9,
703 .noirq_config = {
704 .channel = {
705 AD799X_CHANNEL(0, 10),
706 AD799X_CHANNEL(1, 10),
707 AD799X_CHANNEL(2, 10),
708 AD799X_CHANNEL(3, 10),
709 AD799X_CHANNEL(4, 10),
710 AD799X_CHANNEL(5, 10),
711 AD799X_CHANNEL(6, 10),
712 AD799X_CHANNEL(7, 10),
713 IIO_CHAN_SOFT_TIMESTAMP(8),
714 },
715 .info = &ad7993_4_7_8_noirq_info,
716 },
717 .irq_config = {
718 .channel = {
719 AD799X_CHANNEL_WITH_EVENTS(0, 10),
720 AD799X_CHANNEL_WITH_EVENTS(1, 10),
721 AD799X_CHANNEL_WITH_EVENTS(2, 10),
722 AD799X_CHANNEL_WITH_EVENTS(3, 10),
723 AD799X_CHANNEL(4, 10),
724 AD799X_CHANNEL(5, 10),
725 AD799X_CHANNEL(6, 10),
726 AD799X_CHANNEL(7, 10),
727 IIO_CHAN_SOFT_TIMESTAMP(8),
728 },
729 .default_config = AD7998_ALERT_EN | AD7998_BUSY_ALERT,
730 .info = &ad7993_4_7_8_irq_info,
731 },
732 },
733 [ad7998] = {
734 .num_channels = 9,
735 .noirq_config = {
736 .channel = {
737 AD799X_CHANNEL(0, 12),
738 AD799X_CHANNEL(1, 12),
739 AD799X_CHANNEL(2, 12),
740 AD799X_CHANNEL(3, 12),
741 AD799X_CHANNEL(4, 12),
742 AD799X_CHANNEL(5, 12),
743 AD799X_CHANNEL(6, 12),
744 AD799X_CHANNEL(7, 12),
745 IIO_CHAN_SOFT_TIMESTAMP(8),
746 },
747 .info = &ad7993_4_7_8_noirq_info,
748 },
749 .irq_config = {
750 .channel = {
751 AD799X_CHANNEL_WITH_EVENTS(0, 12),
752 AD799X_CHANNEL_WITH_EVENTS(1, 12),
753 AD799X_CHANNEL_WITH_EVENTS(2, 12),
754 AD799X_CHANNEL_WITH_EVENTS(3, 12),
755 AD799X_CHANNEL(4, 12),
756 AD799X_CHANNEL(5, 12),
757 AD799X_CHANNEL(6, 12),
758 AD799X_CHANNEL(7, 12),
759 IIO_CHAN_SOFT_TIMESTAMP(8),
760 },
761 .default_config = AD7998_ALERT_EN | AD7998_BUSY_ALERT,
762 .info = &ad7993_4_7_8_irq_info,
763 },
764 },
765 };
766
767 static int ad799x_probe(struct i2c_client *client,
768 const struct i2c_device_id *id)
769 {
770 int ret;
771 struct ad799x_state *st;
772 struct iio_dev *indio_dev;
773 const struct ad799x_chip_info *chip_info =
774 &ad799x_chip_info_tbl[id->driver_data];
775
776 indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*st));
777 if (indio_dev == NULL)
778 return -ENOMEM;
779
780 st = iio_priv(indio_dev);
781 /* this is only used for device removal purposes */
782 i2c_set_clientdata(client, indio_dev);
783
784 st->id = id->driver_data;
785 if (client->irq > 0 && chip_info->irq_config.info)
786 st->chip_config = &chip_info->irq_config;
787 else
788 st->chip_config = &chip_info->noirq_config;
789
790 /* TODO: Add pdata options for filtering and bit delay */
791
792 st->reg = devm_regulator_get(&client->dev, "vcc");
793 if (IS_ERR(st->reg))
794 return PTR_ERR(st->reg);
795 ret = regulator_enable(st->reg);
796 if (ret)
797 return ret;
798 st->vref = devm_regulator_get(&client->dev, "vref");
799 if (IS_ERR(st->vref)) {
800 ret = PTR_ERR(st->vref);
801 goto error_disable_reg;
802 }
803 ret = regulator_enable(st->vref);
804 if (ret)
805 goto error_disable_reg;
806
807 st->client = client;
808
809 indio_dev->dev.parent = &client->dev;
810 indio_dev->dev.of_node = client->dev.of_node;
811 indio_dev->name = id->name;
812 indio_dev->info = st->chip_config->info;
813
814 indio_dev->modes = INDIO_DIRECT_MODE;
815 indio_dev->channels = st->chip_config->channel;
816 indio_dev->num_channels = chip_info->num_channels;
817
818 ret = ad799x_write_config(st, st->chip_config->default_config);
819 if (ret < 0)
820 goto error_disable_reg;
821 ret = ad799x_read_config(st);
822 if (ret < 0)
823 goto error_disable_reg;
824 st->config = ret;
825
826 ret = iio_triggered_buffer_setup(indio_dev, NULL,
827 &ad799x_trigger_handler, NULL);
828 if (ret)
829 goto error_disable_vref;
830
831 if (client->irq > 0) {
832 ret = devm_request_threaded_irq(&client->dev,
833 client->irq,
834 NULL,
835 ad799x_event_handler,
836 IRQF_TRIGGER_FALLING |
837 IRQF_ONESHOT,
838 client->name,
839 indio_dev);
840 if (ret)
841 goto error_cleanup_ring;
842 }
843 ret = iio_device_register(indio_dev);
844 if (ret)
845 goto error_cleanup_ring;
846
847 return 0;
848
849 error_cleanup_ring:
850 iio_triggered_buffer_cleanup(indio_dev);
851 error_disable_vref:
852 regulator_disable(st->vref);
853 error_disable_reg:
854 regulator_disable(st->reg);
855
856 return ret;
857 }
858
859 static int ad799x_remove(struct i2c_client *client)
860 {
861 struct iio_dev *indio_dev = i2c_get_clientdata(client);
862 struct ad799x_state *st = iio_priv(indio_dev);
863
864 iio_device_unregister(indio_dev);
865
866 iio_triggered_buffer_cleanup(indio_dev);
867 regulator_disable(st->vref);
868 regulator_disable(st->reg);
869 kfree(st->rx_buf);
870
871 return 0;
872 }
873
874 static const struct i2c_device_id ad799x_id[] = {
875 { "ad7991", ad7991 },
876 { "ad7995", ad7995 },
877 { "ad7999", ad7999 },
878 { "ad7992", ad7992 },
879 { "ad7993", ad7993 },
880 { "ad7994", ad7994 },
881 { "ad7997", ad7997 },
882 { "ad7998", ad7998 },
883 {}
884 };
885
886 MODULE_DEVICE_TABLE(i2c, ad799x_id);
887
888 static struct i2c_driver ad799x_driver = {
889 .driver = {
890 .name = "ad799x",
891 },
892 .probe = ad799x_probe,
893 .remove = ad799x_remove,
894 .id_table = ad799x_id,
895 };
896 module_i2c_driver(ad799x_driver);
897
898 MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>");
899 MODULE_DESCRIPTION("Analog Devices AD799x ADC");
900 MODULE_LICENSE("GPL v2");
Linux with added FPC-III support