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[mirror_ubuntu-zesty-kernel.git] / drivers / staging / iio / adc / ad799x_core.c
CommitLineData
985dbe77
MH		 1/*
2 * iio/adc/ad799x.c
3 * Copyright (C) 2010 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/workqueue.h>
27#include <linux/device.h>
28#include <linux/kernel.h>
29#include <linux/sysfs.h>
30#include <linux/list.h>
31#include <linux/i2c.h>
32#include <linux/regulator/consumer.h>
33#include <linux/slab.h>
34#include <linux/types.h>
35#include <linux/err.h>
36
37#include "../iio.h"
38#include "../sysfs.h"
39
40#include "../ring_generic.h"
41#include "adc.h"
42#include "ad799x.h"
43
44/*
45 * ad799x register access by I2C
46 */
47static int ad799x_i2c_read16(struct ad799x_state *st, u8 reg, u16 *data)
48{
49 struct i2c_client *client = st->client;
50 int ret = 0;
51
52 ret = i2c_smbus_read_word_data(client, reg);
53 if (ret < 0) {
54 dev_err(&client->dev, "I2C read error\n");
55 return ret;
56 }
57
58 *data = swab16((u16)ret);
59
60 return 0;
61}
62
63static int ad799x_i2c_read8(struct ad799x_state *st, u8 reg, u8 *data)
64{
65 struct i2c_client *client = st->client;
66 int ret = 0;
67
aecac191 68 ret = i2c_smbus_read_byte_data(client, reg);
985dbe77
MH		 69 if (ret < 0) {
70 dev_err(&client->dev, "I2C read error\n");
71 return ret;
72 }
73
aecac191 74 *data = (u8)ret;
985dbe77
MH		 75
76 return 0;
77}
78
79static int ad799x_i2c_write16(struct ad799x_state *st, u8 reg, u16 data)
80{
81 struct i2c_client *client = st->client;
82 int ret = 0;
83
84 ret = i2c_smbus_write_word_data(client, reg, swab16(data));
85 if (ret < 0)
86 dev_err(&client->dev, "I2C write error\n");
87
88 return ret;
89}
90
91static int ad799x_i2c_write8(struct ad799x_state *st, u8 reg, u8 data)
92{
93 struct i2c_client *client = st->client;
94 int ret = 0;
95
96 ret = i2c_smbus_write_byte_data(client, reg, data);
97 if (ret < 0)
98 dev_err(&client->dev, "I2C write error\n");
99
100 return ret;
101}
102
103static int ad799x_scan_el_set_state(struct iio_scan_el *scan_el,
104 struct iio_dev *indio_dev,
105 bool state)
106{
107 struct ad799x_state *st = indio_dev->dev_data;
108 return ad799x_set_scan_mode(st, st->indio_dev->ring->scan_mask);
109}
110
111/* Here we claim all are 16 bits. This currently does no harm and saves
112 * us a lot of scan element listings */
113
114#define AD799X_SCAN_EL(number) \
115 IIO_SCAN_EL_C(in##number, number, 0, ad799x_scan_el_set_state);
116
117static AD799X_SCAN_EL(0);
118static AD799X_SCAN_EL(1);
119static AD799X_SCAN_EL(2);
120static AD799X_SCAN_EL(3);
121static AD799X_SCAN_EL(4);
122static AD799X_SCAN_EL(5);
123static AD799X_SCAN_EL(6);
124static AD799X_SCAN_EL(7);
125
a2396dfc
MH		 126static IIO_SCAN_EL_TIMESTAMP(8);
127static IIO_CONST_ATTR_SCAN_EL_TYPE(timestamp, s, 64, 64)
128
3ba2e493 129static ssize_t ad799x_show_type(struct device *dev,
985dbe77
MH		 130 struct device_attribute *attr,
131 char *buf)
132{
3ba2e493
MH		 133 struct iio_ring_buffer *ring = dev_get_drvdata(dev);
134 struct iio_dev *indio_dev = ring->indio_dev;
135 struct ad799x_state *st = indio_dev->dev_data;
985dbe77 136
3ba2e493
MH		 137 return sprintf(buf, "%c%d/%d\n", st->chip_info->sign,
138 st->chip_info->bits, AD799X_STORAGEBITS);
139}
140static IIO_DEVICE_ATTR(in_type, S_IRUGO, ad799x_show_type, NULL, 0);
985dbe77
MH		 141
142static int ad7991_5_9_set_scan_mode(struct ad799x_state *st, unsigned mask)
143{
144 return i2c_smbus_write_byte(st->client,
145 st->config | (mask << AD799X_CHANNEL_SHIFT));
146}
147
148static int ad7992_3_4_set_scan_mode(struct ad799x_state *st, unsigned mask)
149{
150 return ad799x_i2c_write8(st, AD7998_CONF_REG,
151 st->config | (mask << AD799X_CHANNEL_SHIFT));
152}
153
154static int ad7997_8_set_scan_mode(struct ad799x_state *st, unsigned mask)
155{
156 return ad799x_i2c_write16(st, AD7998_CONF_REG,
157 st->config | (mask << AD799X_CHANNEL_SHIFT));
158}
159
160int ad799x_set_scan_mode(struct ad799x_state *st, unsigned mask)
161{
162 int ret;
163
164 if (st->chip_info->ad799x_set_scan_mode != NULL) {
165 ret = st->chip_info->ad799x_set_scan_mode(st, mask);
166 return (ret > 0) ? 0 : ret;
167 }
168
169 return 0;
170}
171
172static ssize_t ad799x_read_single_channel(struct device *dev,
173 struct device_attribute *attr,
174 char *buf)
175{
176 struct iio_dev *dev_info = dev_get_drvdata(dev);
177 struct ad799x_state *st = iio_dev_get_devdata(dev_info);
178 struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
179 int ret = 0, len = 0;
180 u32 data ;
181 u16 rxbuf[1];
182 u8 cmd;
183 long mask;
184
185 mutex_lock(&dev_info->mlock);
186 mask = 1 << this_attr->address;
25985edc 187 /* If ring buffer capture is occurring, query the buffer */
985dbe77 188 if (iio_ring_enabled(dev_info)) {
aecac191
MH		 189 data = ret = ad799x_single_channel_from_ring(st, mask);
190 if (ret < 0)
985dbe77 191 goto error_ret;
aecac191 192 ret = 0;
985dbe77
MH		 193 } else {
194 switch (st->id) {
195 case ad7991:
196 case ad7995:
197 case ad7999:
198 cmd = st->config | (mask << AD799X_CHANNEL_SHIFT);
199 break;
200 case ad7992:
201 case ad7993:
202 case ad7994:
203 cmd = mask << AD799X_CHANNEL_SHIFT;
204 break;
205 case ad7997:
206 case ad7998:
207 cmd = (this_attr->address <<
208 AD799X_CHANNEL_SHIFT) | AD7997_8_READ_SINGLE;
209 break;
210 default:
211 cmd = 0;
212
213 }
214 ret = ad799x_i2c_read16(st, cmd, rxbuf);
215 if (ret < 0)
216 goto error_ret;
217
3ba2e493 218 data = rxbuf[0];
985dbe77
MH		 219 }
220
221 /* Pretty print the result */
3ba2e493 222 len = sprintf(buf, "%u\n", data & ((1 << (st->chip_info->bits)) - 1));
985dbe77
MH		 223
224error_ret:
225 mutex_unlock(&dev_info->mlock);
226 return ret ? ret : len;
227}
228
229static ssize_t ad799x_read_frequency(struct device *dev,
230 struct device_attribute *attr,
231 char *buf)
232{
233 struct iio_dev *dev_info = dev_get_drvdata(dev);
234 struct ad799x_state *st = iio_dev_get_devdata(dev_info);
235
236 int ret, len = 0;
237 u8 val;
238 ret = ad799x_i2c_read8(st, AD7998_CYCLE_TMR_REG, &val);
239 if (ret)
240 return ret;
241
242 val &= AD7998_CYC_MASK;
243
244 switch (val) {
245 case AD7998_CYC_DIS:
246 len = sprintf(buf, "0\n");
247 break;
248 case AD7998_CYC_TCONF_32:
249 len = sprintf(buf, "15625\n");
250 break;
251 case AD7998_CYC_TCONF_64:
252 len = sprintf(buf, "7812\n");
253 break;
254 case AD7998_CYC_TCONF_128:
255 len = sprintf(buf, "3906\n");
256 break;
257 case AD7998_CYC_TCONF_256:
258 len = sprintf(buf, "1953\n");
259 break;
260 case AD7998_CYC_TCONF_512:
261 len = sprintf(buf, "976\n");
262 break;
263 case AD7998_CYC_TCONF_1024:
264 len = sprintf(buf, "488\n");
265 break;
266 case AD7998_CYC_TCONF_2048:
267 len = sprintf(buf, "244\n");
268 break;
269 }
270 return len;
271}
272
273static ssize_t ad799x_write_frequency(struct device *dev,
274 struct device_attribute *attr,
275 const char *buf,
276 size_t len)
277{
278 struct iio_dev *dev_info = dev_get_drvdata(dev);
279 struct ad799x_state *st = iio_dev_get_devdata(dev_info);
280
281 long val;
282 int ret;
283 u8 t;
284
285 ret = strict_strtol(buf, 10, &val);
286 if (ret)
287 return ret;
288
289 mutex_lock(&dev_info->mlock);
290 ret = ad799x_i2c_read8(st, AD7998_CYCLE_TMR_REG, &t);
291 if (ret)
292 goto error_ret_mutex;
293 /* Wipe the bits clean */
294 t &= ~AD7998_CYC_MASK;
295
296 switch (val) {
297 case 15625:
298 t |= AD7998_CYC_TCONF_32;
299 break;
300 case 7812:
301 t |= AD7998_CYC_TCONF_64;
302 break;
303 case 3906:
304 t |= AD7998_CYC_TCONF_128;
305 break;
306 case 1953:
307 t |= AD7998_CYC_TCONF_256;
308 break;
309 case 976:
310 t |= AD7998_CYC_TCONF_512;
311 break;
312 case 488:
313 t |= AD7998_CYC_TCONF_1024;
314 break;
315 case 244:
316 t |= AD7998_CYC_TCONF_2048;
317 break;
318 case 0:
319 t |= AD7998_CYC_DIS;
320 break;
321 default:
322 ret = -EINVAL;
323 goto error_ret_mutex;
324 }
325
326 ret = ad799x_i2c_write8(st, AD7998_CYCLE_TMR_REG, t);
327
328error_ret_mutex:
329 mutex_unlock(&dev_info->mlock);
330
331 return ret ? ret : len;
332}
333
334
335static ssize_t ad799x_read_channel_config(struct device *dev,
336 struct device_attribute *attr,
337 char *buf)
338{
339 struct iio_dev *dev_info = dev_get_drvdata(dev);
340 struct ad799x_state *st = iio_dev_get_devdata(dev_info);
341 struct iio_event_attr *this_attr = to_iio_event_attr(attr);
342
343 int ret;
344 u16 val;
345 ret = ad799x_i2c_read16(st, this_attr->mask, &val);
346 if (ret)
347 return ret;
348
349 return sprintf(buf, "%d\n", val);
350}
351
352static ssize_t ad799x_write_channel_config(struct device *dev,
353 struct device_attribute *attr,
354 const char *buf,
355 size_t len)
356{
357 struct iio_dev *dev_info = dev_get_drvdata(dev);
358 struct ad799x_state *st = iio_dev_get_devdata(dev_info);
359 struct iio_event_attr *this_attr = to_iio_event_attr(attr);
360
361 long val;
362 int ret;
363
364 ret = strict_strtol(buf, 10, &val);
365 if (ret)
366 return ret;
367
368 mutex_lock(&dev_info->mlock);
369 ret = ad799x_i2c_write16(st, this_attr->mask, val);
370 mutex_unlock(&dev_info->mlock);
371
372 return ret ? ret : len;
373}
374
375static void ad799x_interrupt_bh(struct work_struct *work_s)
376{
377 struct ad799x_state *st = container_of(work_s,
378 struct ad799x_state, work_thresh);
379 u8 status;
380 int i;
381
382 if (ad799x_i2c_read8(st, AD7998_ALERT_STAT_REG, &status))
383 goto err_out;
384
385 if (!status)
386 goto err_out;
387
388 ad799x_i2c_write8(st, AD7998_ALERT_STAT_REG, AD7998_ALERT_STAT_CLEAR);
389
390 for (i = 0; i < 8; i++) {
391 if (status & (1 << i))
392 iio_push_event(st->indio_dev, 0,
393 i & 0x1 ?
394 IIO_EVENT_CODE_IN_HIGH_THRESH(i >> 1) :
395 IIO_EVENT_CODE_IN_LOW_THRESH(i >> 1),
396 st->last_timestamp);
397 }
398
399err_out:
400 enable_irq(st->client->irq);
401}
402
403static int ad799x_interrupt(struct iio_dev *dev_info,
404 int index,
405 s64 timestamp,
406 int no_test)
407{
408 struct ad799x_state *st = dev_info->dev_data;
409
410 st->last_timestamp = timestamp;
411 schedule_work(&st->work_thresh);
412 return 0;
413}
414
415IIO_EVENT_SH(ad799x, &ad799x_interrupt);
416
417/* Direct read attribtues */
418static IIO_DEV_ATTR_IN_RAW(0, ad799x_read_single_channel, 0);
419static IIO_DEV_ATTR_IN_RAW(1, ad799x_read_single_channel, 1);
420static IIO_DEV_ATTR_IN_RAW(2, ad799x_read_single_channel, 2);
421static IIO_DEV_ATTR_IN_RAW(3, ad799x_read_single_channel, 3);
422static IIO_DEV_ATTR_IN_RAW(4, ad799x_read_single_channel, 4);
423static IIO_DEV_ATTR_IN_RAW(5, ad799x_read_single_channel, 5);
424static IIO_DEV_ATTR_IN_RAW(6, ad799x_read_single_channel, 6);
425static IIO_DEV_ATTR_IN_RAW(7, ad799x_read_single_channel, 7);
426
427static ssize_t ad799x_show_scale(struct device *dev,
428 struct device_attribute *attr,
429 char *buf)
430{
431 /* Driver currently only support internal vref */
432 struct iio_dev *dev_info = dev_get_drvdata(dev);
433 struct ad799x_state *st = iio_dev_get_devdata(dev_info);
1139df53 434
985dbe77 435 /* Corresponds to Vref / 2^(bits) */
1139df53 436 unsigned int scale_uv = (st->int_vref_mv * 1000) >> st->chip_info->bits;
985dbe77 437
e71a7fd2 438 return sprintf(buf, "%d.%03d\n", scale_uv / 1000, scale_uv % 1000);
985dbe77
MH		 439}
440
441static IIO_DEVICE_ATTR(in_scale, S_IRUGO, ad799x_show_scale, NULL, 0);
442
443static ssize_t ad799x_show_name(struct device *dev,
444 struct device_attribute *attr,
445 char *buf)
446{
447 struct iio_dev *dev_info = dev_get_drvdata(dev);
448 struct ad799x_state *st = iio_dev_get_devdata(dev_info);
449 return sprintf(buf, "%s\n", st->client->name);
450}
451
452static IIO_DEVICE_ATTR(name, S_IRUGO, ad799x_show_name, NULL, 0);
453
454static struct attribute *ad7991_5_9_3_4_device_attrs[] = {
455 &iio_dev_attr_in0_raw.dev_attr.attr,
456 &iio_dev_attr_in1_raw.dev_attr.attr,
457 &iio_dev_attr_in2_raw.dev_attr.attr,
458 &iio_dev_attr_in3_raw.dev_attr.attr,
459 &iio_dev_attr_name.dev_attr.attr,
460 &iio_dev_attr_in_scale.dev_attr.attr,
461 NULL
462};
463
464static struct attribute_group ad7991_5_9_3_4_dev_attr_group = {
465 .attrs = ad7991_5_9_3_4_device_attrs,
466};
467
468static struct attribute *ad7991_5_9_3_4_scan_el_attrs[] = {
469 &iio_scan_el_in0.dev_attr.attr,
470 &iio_const_attr_in0_index.dev_attr.attr,
471 &iio_scan_el_in1.dev_attr.attr,
472 &iio_const_attr_in1_index.dev_attr.attr,
473 &iio_scan_el_in2.dev_attr.attr,
474 &iio_const_attr_in2_index.dev_attr.attr,
475 &iio_scan_el_in3.dev_attr.attr,
476 &iio_const_attr_in3_index.dev_attr.attr,
a2396dfc
MH		 477 &iio_const_attr_timestamp_index.dev_attr.attr,
478 &iio_scan_el_timestamp.dev_attr.attr,
479 &iio_const_attr_timestamp_type.dev_attr.attr,
3ba2e493 480 &iio_dev_attr_in_type.dev_attr.attr,
985dbe77
MH		 481 NULL,
482};
483
484static struct attribute_group ad7991_5_9_3_4_scan_el_group = {
485 .name = "scan_elements",
486 .attrs = ad7991_5_9_3_4_scan_el_attrs,
487};
488
489static struct attribute *ad7992_device_attrs[] = {
490 &iio_dev_attr_in0_raw.dev_attr.attr,
491 &iio_dev_attr_in1_raw.dev_attr.attr,
492 &iio_dev_attr_name.dev_attr.attr,
493 &iio_dev_attr_in_scale.dev_attr.attr,
494 NULL
495};
496
497static struct attribute_group ad7992_dev_attr_group = {
498 .attrs = ad7992_device_attrs,
499};
500
501static struct attribute *ad7992_scan_el_attrs[] = {
502 &iio_scan_el_in0.dev_attr.attr,
503 &iio_const_attr_in0_index.dev_attr.attr,
504 &iio_scan_el_in1.dev_attr.attr,
505 &iio_const_attr_in1_index.dev_attr.attr,
a2396dfc
MH		 506 &iio_const_attr_timestamp_index.dev_attr.attr,
507 &iio_scan_el_timestamp.dev_attr.attr,
508 &iio_const_attr_timestamp_type.dev_attr.attr,
3ba2e493 509 &iio_dev_attr_in_type.dev_attr.attr,
985dbe77
MH		 510 NULL,
511};
512
513static struct attribute_group ad7992_scan_el_group = {
514 .name = "scan_elements",
515 .attrs = ad7992_scan_el_attrs,
516};
517
518static struct attribute *ad7997_8_device_attrs[] = {
519 &iio_dev_attr_in0_raw.dev_attr.attr,
520 &iio_dev_attr_in1_raw.dev_attr.attr,
521 &iio_dev_attr_in2_raw.dev_attr.attr,
522 &iio_dev_attr_in3_raw.dev_attr.attr,
523 &iio_dev_attr_in4_raw.dev_attr.attr,
524 &iio_dev_attr_in5_raw.dev_attr.attr,
525 &iio_dev_attr_in6_raw.dev_attr.attr,
526 &iio_dev_attr_in7_raw.dev_attr.attr,
527 &iio_dev_attr_name.dev_attr.attr,
528 &iio_dev_attr_in_scale.dev_attr.attr,
529 NULL
530};
531
532static struct attribute_group ad7997_8_dev_attr_group = {
533 .attrs = ad7997_8_device_attrs,
534};
535
536static struct attribute *ad7997_8_scan_el_attrs[] = {
537 &iio_scan_el_in0.dev_attr.attr,
538 &iio_const_attr_in0_index.dev_attr.attr,
539 &iio_scan_el_in1.dev_attr.attr,
540 &iio_const_attr_in1_index.dev_attr.attr,
541 &iio_scan_el_in2.dev_attr.attr,
542 &iio_const_attr_in2_index.dev_attr.attr,
543 &iio_scan_el_in3.dev_attr.attr,
544 &iio_const_attr_in3_index.dev_attr.attr,
545 &iio_scan_el_in4.dev_attr.attr,
546 &iio_const_attr_in4_index.dev_attr.attr,
547 &iio_scan_el_in5.dev_attr.attr,
548 &iio_const_attr_in5_index.dev_attr.attr,
549 &iio_scan_el_in6.dev_attr.attr,
550 &iio_const_attr_in6_index.dev_attr.attr,
551 &iio_scan_el_in7.dev_attr.attr,
552 &iio_const_attr_in7_index.dev_attr.attr,
a2396dfc
MH		 553 &iio_const_attr_timestamp_index.dev_attr.attr,
554 &iio_scan_el_timestamp.dev_attr.attr,
555 &iio_const_attr_timestamp_type.dev_attr.attr,
3ba2e493 556 &iio_dev_attr_in_type.dev_attr.attr,
985dbe77
MH		 557 NULL,
558};
559
560static struct attribute_group ad7997_8_scan_el_group = {
561 .name = "scan_elements",
562 .attrs = ad7997_8_scan_el_attrs,
563};
564
565IIO_EVENT_ATTR_SH(in0_thresh_low_value,
566 iio_event_ad799x,
567 ad799x_read_channel_config,
568 ad799x_write_channel_config,
569 AD7998_DATALOW_CH1_REG);
570
571IIO_EVENT_ATTR_SH(in0_thresh_high_value,
572 iio_event_ad799x,
573 ad799x_read_channel_config,
574 ad799x_write_channel_config,
575 AD7998_DATAHIGH_CH1_REG);
576
577IIO_EVENT_ATTR_SH(in0_thresh_both_hyst_raw,
578 iio_event_ad799x,
579 ad799x_read_channel_config,
580 ad799x_write_channel_config,
581 AD7998_HYST_CH1_REG);
582
583IIO_EVENT_ATTR_SH(in1_thresh_low_value,
584 iio_event_ad799x,
585 ad799x_read_channel_config,
586 ad799x_write_channel_config,
587 AD7998_DATALOW_CH2_REG);
588
589IIO_EVENT_ATTR_SH(in1_thresh_high_value,
590 iio_event_ad799x,
591 ad799x_read_channel_config,
592 ad799x_write_channel_config,
593 AD7998_DATAHIGH_CH2_REG);
594
595IIO_EVENT_ATTR_SH(in1_thresh_both_hyst_raw,
596 iio_event_ad799x,
597 ad799x_read_channel_config,
598 ad799x_write_channel_config,
599 AD7998_HYST_CH2_REG);
600
601IIO_EVENT_ATTR_SH(in2_thresh_low_value,
602 iio_event_ad799x,
603 ad799x_read_channel_config,
604 ad799x_write_channel_config,
605 AD7998_DATALOW_CH3_REG);
606
607IIO_EVENT_ATTR_SH(in2_thresh_high_value,
608 iio_event_ad799x,
609 ad799x_read_channel_config,
610 ad799x_write_channel_config,
611 AD7998_DATAHIGH_CH3_REG);
612
613IIO_EVENT_ATTR_SH(in2_thresh_both_hyst_raw,
614 iio_event_ad799x,
615 ad799x_read_channel_config,
616 ad799x_write_channel_config,
617 AD7998_HYST_CH3_REG);
618
619IIO_EVENT_ATTR_SH(in3_thresh_low_value,
620 iio_event_ad799x,
621 ad799x_read_channel_config,
622 ad799x_write_channel_config,
623 AD7998_DATALOW_CH4_REG);
624
625IIO_EVENT_ATTR_SH(in3_thresh_high_value,
626 iio_event_ad799x,
627 ad799x_read_channel_config,
628 ad799x_write_channel_config,
629 AD7998_DATAHIGH_CH4_REG);
630
631IIO_EVENT_ATTR_SH(in3_thresh_both_hyst_raw,
632 iio_event_ad799x,
633 ad799x_read_channel_config,
634 ad799x_write_channel_config,
635 AD7998_HYST_CH4_REG);
636
637static IIO_DEV_ATTR_SAMP_FREQ(S_IWUSR | S_IRUGO,
638 ad799x_read_frequency,
639 ad799x_write_frequency);
640static IIO_CONST_ATTR_SAMP_FREQ_AVAIL("15625 7812 3906 1953 976 488 244 0");
641
642static struct attribute *ad7993_4_7_8_event_attributes[] = {
643 &iio_event_attr_in0_thresh_low_value.dev_attr.attr,
644 &iio_event_attr_in0_thresh_high_value.dev_attr.attr,
645 &iio_event_attr_in0_thresh_both_hyst_raw.dev_attr.attr,
646 &iio_event_attr_in1_thresh_low_value.dev_attr.attr,
647 &iio_event_attr_in1_thresh_high_value.dev_attr.attr,
648 &iio_event_attr_in1_thresh_both_hyst_raw.dev_attr.attr,
649 &iio_event_attr_in2_thresh_low_value.dev_attr.attr,
650 &iio_event_attr_in2_thresh_high_value.dev_attr.attr,
651 &iio_event_attr_in2_thresh_both_hyst_raw.dev_attr.attr,
652 &iio_event_attr_in3_thresh_low_value.dev_attr.attr,
653 &iio_event_attr_in3_thresh_high_value.dev_attr.attr,
654 &iio_event_attr_in3_thresh_both_hyst_raw.dev_attr.attr,
655 &iio_dev_attr_sampling_frequency.dev_attr.attr,
656 &iio_const_attr_sampling_frequency_available.dev_attr.attr,
657 NULL,
658};
659
660static struct attribute_group ad7993_4_7_8_event_attrs_group = {
661 .attrs = ad7993_4_7_8_event_attributes,
662};
663
664static struct attribute *ad7992_event_attributes[] = {
665 &iio_event_attr_in0_thresh_low_value.dev_attr.attr,
666 &iio_event_attr_in0_thresh_high_value.dev_attr.attr,
667 &iio_event_attr_in0_thresh_both_hyst_raw.dev_attr.attr,
668 &iio_event_attr_in1_thresh_low_value.dev_attr.attr,
669 &iio_event_attr_in1_thresh_high_value.dev_attr.attr,
670 &iio_event_attr_in1_thresh_both_hyst_raw.dev_attr.attr,
671 &iio_dev_attr_sampling_frequency.dev_attr.attr,
672 &iio_const_attr_sampling_frequency_available.dev_attr.attr,
673 NULL,
674};
675
676static struct attribute_group ad7992_event_attrs_group = {
677 .attrs = ad7992_event_attributes,
678};
679
680static const struct ad799x_chip_info ad799x_chip_info_tbl[] = {
681 [ad7991] = {
682 .num_inputs = 4,
683 .bits = 12,
3ba2e493 684 .sign = IIO_SCAN_EL_TYPE_UNSIGNED,
985dbe77
MH		 685 .int_vref_mv = 4096,
686 .dev_attrs = &ad7991_5_9_3_4_dev_attr_group,
687 .scan_attrs = &ad7991_5_9_3_4_scan_el_group,
688 .ad799x_set_scan_mode = ad7991_5_9_set_scan_mode,
689 },
690 [ad7995] = {
691 .num_inputs = 4,
692 .bits = 10,
3ba2e493 693 .sign = IIO_SCAN_EL_TYPE_UNSIGNED,
985dbe77
MH		 694 .int_vref_mv = 1024,
695 .dev_attrs = &ad7991_5_9_3_4_dev_attr_group,
696 .scan_attrs = &ad7991_5_9_3_4_scan_el_group,
697 .ad799x_set_scan_mode = ad7991_5_9_set_scan_mode,
698 },
699 [ad7999] = {
700 .num_inputs = 4,
701 .bits = 10,
3ba2e493 702 .sign = IIO_SCAN_EL_TYPE_UNSIGNED,
985dbe77
MH		 703 .int_vref_mv = 1024,
704 .dev_attrs = &ad7991_5_9_3_4_dev_attr_group,
705 .scan_attrs = &ad7991_5_9_3_4_scan_el_group,
706 .ad799x_set_scan_mode = ad7991_5_9_set_scan_mode,
707 },
708 [ad7992] = {
709 .num_inputs = 2,
710 .bits = 12,
3ba2e493 711 .sign = IIO_SCAN_EL_TYPE_UNSIGNED,
985dbe77
MH		 712 .int_vref_mv = 4096,
713 .monitor_mode = true,
714 .default_config = AD7998_ALERT_EN,
715 .dev_attrs = &ad7992_dev_attr_group,
716 .scan_attrs = &ad7992_scan_el_group,
717 .event_attrs = &ad7992_event_attrs_group,
718 .ad799x_set_scan_mode = ad7992_3_4_set_scan_mode,
719 },
720 [ad7993] = {
721 .num_inputs = 4,
722 .bits = 10,
3ba2e493 723 .sign = IIO_SCAN_EL_TYPE_UNSIGNED,
985dbe77
MH		 724 .int_vref_mv = 1024,
725 .monitor_mode = true,
726 .default_config = AD7998_ALERT_EN,
727 .dev_attrs = &ad7991_5_9_3_4_dev_attr_group,
728 .scan_attrs = &ad7991_5_9_3_4_scan_el_group,
729 .event_attrs = &ad7993_4_7_8_event_attrs_group,
730 .ad799x_set_scan_mode = ad7992_3_4_set_scan_mode,
731 },
732 [ad7994] = {
733 .num_inputs = 4,
734 .bits = 12,
3ba2e493 735 .sign = IIO_SCAN_EL_TYPE_UNSIGNED,
985dbe77
MH		 736 .int_vref_mv = 4096,
737 .monitor_mode = true,
738 .default_config = AD7998_ALERT_EN,
739 .dev_attrs = &ad7991_5_9_3_4_dev_attr_group,
740 .scan_attrs = &ad7991_5_9_3_4_scan_el_group,
741 .event_attrs = &ad7993_4_7_8_event_attrs_group,
742 .ad799x_set_scan_mode = ad7992_3_4_set_scan_mode,
743 },
744 [ad7997] = {
745 .num_inputs = 8,
746 .bits = 10,
3ba2e493 747 .sign = IIO_SCAN_EL_TYPE_UNSIGNED,
985dbe77
MH		 748 .int_vref_mv = 1024,
749 .monitor_mode = true,
750 .default_config = AD7998_ALERT_EN,
751 .dev_attrs = &ad7997_8_dev_attr_group,
752 .scan_attrs = &ad7997_8_scan_el_group,
753 .event_attrs = &ad7993_4_7_8_event_attrs_group,
754 .ad799x_set_scan_mode = ad7997_8_set_scan_mode,
755 },
756 [ad7998] = {
757 .num_inputs = 8,
758 .bits = 12,
3ba2e493 759 .sign = IIO_SCAN_EL_TYPE_UNSIGNED,
985dbe77
MH		 760 .int_vref_mv = 4096,
761 .monitor_mode = true,
762 .default_config = AD7998_ALERT_EN,
763 .dev_attrs = &ad7997_8_dev_attr_group,
764 .scan_attrs = &ad7997_8_scan_el_group,
765 .event_attrs = &ad7993_4_7_8_event_attrs_group,
766 .ad799x_set_scan_mode = ad7997_8_set_scan_mode,
767 },
768};
769
770static int __devinit ad799x_probe(struct i2c_client *client,
771 const struct i2c_device_id *id)
772{
773 int ret, regdone = 0;
774 struct ad799x_platform_data *pdata = client->dev.platform_data;
775 struct ad799x_state *st = kzalloc(sizeof(*st), GFP_KERNEL);
776 if (st == NULL) {
777 ret = -ENOMEM;
778 goto error_ret;
779 }
780
781 /* this is only used for device removal purposes */
782 i2c_set_clientdata(client, st);
783
784 atomic_set(&st->protect_ring, 0);
785 st->id = id->driver_data;
786 st->chip_info = &ad799x_chip_info_tbl[st->id];
787 st->config = st->chip_info->default_config;
788
789 /* TODO: Add pdata options for filtering and bit delay */
790
791 if (pdata)
792 st->int_vref_mv = pdata->vref_mv;
793 else
794 st->int_vref_mv = st->chip_info->int_vref_mv;
795
796 st->reg = regulator_get(&client->dev, "vcc");
797 if (!IS_ERR(st->reg)) {
798 ret = regulator_enable(st->reg);
799 if (ret)
800 goto error_put_reg;
801 }
802 st->client = client;
803
804 st->indio_dev = iio_allocate_device();
805 if (st->indio_dev == NULL) {
806 ret = -ENOMEM;
807 goto error_disable_reg;
808 }
809
810 /* Estabilish that the iio_dev is a child of the i2c device */
811 st->indio_dev->dev.parent = &client->dev;
812 st->indio_dev->attrs = st->chip_info->dev_attrs;
813 st->indio_dev->event_attrs = st->chip_info->event_attrs;
814
815 st->indio_dev->dev_data = (void *)(st);
816 st->indio_dev->driver_module = THIS_MODULE;
817 st->indio_dev->modes = INDIO_DIRECT_MODE;
818 st->indio_dev->num_interrupt_lines = 1;
819
820 ret = ad799x_set_scan_mode(st, 0);
821 if (ret)
822 goto error_free_device;
823
824 ret = ad799x_register_ring_funcs_and_init(st->indio_dev);
825 if (ret)
826 goto error_free_device;
827
828 ret = iio_device_register(st->indio_dev);
829 if (ret)
830 goto error_cleanup_ring;
831 regdone = 1;
832
833 ret = iio_ring_buffer_register(st->indio_dev->ring, 0);
834 if (ret)
835 goto error_cleanup_ring;
836
837 if (client->irq > 0 && st->chip_info->monitor_mode) {
838 INIT_WORK(&st->work_thresh, ad799x_interrupt_bh);
839
840 ret = iio_register_interrupt_line(client->irq,
841 st->indio_dev,
842 0,
843 IRQF_TRIGGER_FALLING,
844 client->name);
845 if (ret)
846 goto error_cleanup_ring;
847
848 /*
849 * The event handler list element refer to iio_event_ad799x.
850 * All event attributes bind to the same event handler.
851 * So, only register event handler once.
852 */
853 iio_add_event_to_list(&iio_event_ad799x,
854 &st->indio_dev->interrupts[0]->ev_list);
855 }
856
857 return 0;
858error_cleanup_ring:
859 ad799x_ring_cleanup(st->indio_dev);
860error_free_device:
861 if (!regdone)
862 iio_free_device(st->indio_dev);
863 else
864 iio_device_unregister(st->indio_dev);
865error_disable_reg:
866 if (!IS_ERR(st->reg))
867 regulator_disable(st->reg);
868error_put_reg:
869 if (!IS_ERR(st->reg))
870 regulator_put(st->reg);
871 kfree(st);
872error_ret:
873 return ret;
874}
875
876static __devexit int ad799x_remove(struct i2c_client *client)
877{
878 struct ad799x_state *st = i2c_get_clientdata(client);
879 struct iio_dev *indio_dev = st->indio_dev;
880
881 if (client->irq > 0 && st->chip_info->monitor_mode)
882 iio_unregister_interrupt_line(indio_dev, 0);
883
884 iio_ring_buffer_unregister(indio_dev->ring);
885 ad799x_ring_cleanup(indio_dev);
886 iio_device_unregister(indio_dev);
887 if (!IS_ERR(st->reg)) {
888 regulator_disable(st->reg);
889 regulator_put(st->reg);
890 }
891 kfree(st);
892
893 return 0;
894}
895
896static const struct i2c_device_id ad799x_id[] = {
897 { "ad7991", ad7991 },
898 { "ad7995", ad7995 },
899 { "ad7999", ad7999 },
900 { "ad7992", ad7992 },
901 { "ad7993", ad7993 },
902 { "ad7994", ad7994 },
903 { "ad7997", ad7997 },
904 { "ad7998", ad7998 },
905 {}
906};
907
908MODULE_DEVICE_TABLE(i2c, ad799x_id);
909
910static struct i2c_driver ad799x_driver = {
911 .driver = {
912 .name = "ad799x",
913 },
914 .probe = ad799x_probe,
915 .remove = __devexit_p(ad799x_remove),
916 .id_table = ad799x_id,
917};
918
919static __init int ad799x_init(void)
920{
921 return i2c_add_driver(&ad799x_driver);
922}
923
924static __exit void ad799x_exit(void)
925{
926 i2c_del_driver(&ad799x_driver);
927}
928
929MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>");
930MODULE_DESCRIPTION("Analog Devices AD799x ADC");
931MODULE_LICENSE("GPL v2");
932MODULE_ALIAS("i2c:ad799x");
933
934module_init(ad799x_init);
935module_exit(ad799x_exit);
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