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25898563aae8dc3bf297e7276a8c95a774752c3b
[deliverable/linux.git] / drivers / staging / iio / adc / ad799x_core.c
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 */
47 static 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
63 static 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
68 ret = i2c_smbus_read_byte_data(client, reg);
69 if (ret < 0) {
70 dev_err(&client->dev, "I2C read error\n");
71 return ret;
72 }
73
74 *data = (u8)ret;
75
76 return 0;
77 }
78
79 static 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
91 static 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
103 static 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
117 static AD799X_SCAN_EL(0);
118 static AD799X_SCAN_EL(1);
119 static AD799X_SCAN_EL(2);
120 static AD799X_SCAN_EL(3);
121 static AD799X_SCAN_EL(4);
122 static AD799X_SCAN_EL(5);
123 static AD799X_SCAN_EL(6);
124 static AD799X_SCAN_EL(7);
125
126 static ssize_t ad799x_show_precision(struct device *dev,
127 struct device_attribute *attr,
128 char *buf)
129 {
130 struct iio_dev *dev_info = dev_get_drvdata(dev);
131 struct ad799x_state *st = iio_dev_get_devdata(dev_info);
132 return sprintf(buf, "%d\n", st->chip_info->bits);
133 }
134
135 static IIO_DEVICE_ATTR(in_precision, S_IRUGO, ad799x_show_precision,
136 NULL, 0);
137
138 static int ad7991_5_9_set_scan_mode(struct ad799x_state *st, unsigned mask)
139 {
140 return i2c_smbus_write_byte(st->client,
141 st->config | (mask << AD799X_CHANNEL_SHIFT));
142 }
143
144 static int ad7992_3_4_set_scan_mode(struct ad799x_state *st, unsigned mask)
145 {
146 return ad799x_i2c_write8(st, AD7998_CONF_REG,
147 st->config | (mask << AD799X_CHANNEL_SHIFT));
148 }
149
150 static int ad7997_8_set_scan_mode(struct ad799x_state *st, unsigned mask)
151 {
152 return ad799x_i2c_write16(st, AD7998_CONF_REG,
153 st->config | (mask << AD799X_CHANNEL_SHIFT));
154 }
155
156 int ad799x_set_scan_mode(struct ad799x_state *st, unsigned mask)
157 {
158 int ret;
159
160 if (st->chip_info->ad799x_set_scan_mode != NULL) {
161 ret = st->chip_info->ad799x_set_scan_mode(st, mask);
162 return (ret > 0) ? 0 : ret;
163 }
164
165 return 0;
166 }
167
168 static ssize_t ad799x_read_single_channel(struct device *dev,
169 struct device_attribute *attr,
170 char *buf)
171 {
172 struct iio_dev *dev_info = dev_get_drvdata(dev);
173 struct ad799x_state *st = iio_dev_get_devdata(dev_info);
174 struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
175 int ret = 0, len = 0;
176 u32 data ;
177 u16 rxbuf[1];
178 u8 cmd;
179 long mask;
180
181 mutex_lock(&dev_info->mlock);
182 mask = 1 << this_attr->address;
183 /* If ring buffer capture is occuring, query the buffer */
184 if (iio_ring_enabled(dev_info)) {
185 data = ret = ad799x_single_channel_from_ring(st, mask);
186 if (ret < 0)
187 goto error_ret;
188 ret = 0;
189 } else {
190 switch (st->id) {
191 case ad7991:
192 case ad7995:
193 case ad7999:
194 cmd = st->config | (mask << AD799X_CHANNEL_SHIFT);
195 break;
196 case ad7992:
197 case ad7993:
198 case ad7994:
199 cmd = mask << AD799X_CHANNEL_SHIFT;
200 break;
201 case ad7997:
202 case ad7998:
203 cmd = (this_attr->address <<
204 AD799X_CHANNEL_SHIFT) | AD7997_8_READ_SINGLE;
205 break;
206 default:
207 cmd = 0;
208
209 }
210 ret = ad799x_i2c_read16(st, cmd, rxbuf);
211 if (ret < 0)
212 goto error_ret;
213
214 data = rxbuf[0] & 0xFFF;
215 }
216
217 /* Pretty print the result */
218 len = sprintf(buf, "%u\n", data);
219
220 error_ret:
221 mutex_unlock(&dev_info->mlock);
222 return ret ? ret : len;
223 }
224
225 static ssize_t ad799x_read_frequency(struct device *dev,
226 struct device_attribute *attr,
227 char *buf)
228 {
229 struct iio_dev *dev_info = dev_get_drvdata(dev);
230 struct ad799x_state *st = iio_dev_get_devdata(dev_info);
231
232 int ret, len = 0;
233 u8 val;
234 ret = ad799x_i2c_read8(st, AD7998_CYCLE_TMR_REG, &val);
235 if (ret)
236 return ret;
237
238 val &= AD7998_CYC_MASK;
239
240 switch (val) {
241 case AD7998_CYC_DIS:
242 len = sprintf(buf, "0\n");
243 break;
244 case AD7998_CYC_TCONF_32:
245 len = sprintf(buf, "15625\n");
246 break;
247 case AD7998_CYC_TCONF_64:
248 len = sprintf(buf, "7812\n");
249 break;
250 case AD7998_CYC_TCONF_128:
251 len = sprintf(buf, "3906\n");
252 break;
253 case AD7998_CYC_TCONF_256:
254 len = sprintf(buf, "1953\n");
255 break;
256 case AD7998_CYC_TCONF_512:
257 len = sprintf(buf, "976\n");
258 break;
259 case AD7998_CYC_TCONF_1024:
260 len = sprintf(buf, "488\n");
261 break;
262 case AD7998_CYC_TCONF_2048:
263 len = sprintf(buf, "244\n");
264 break;
265 }
266 return len;
267 }
268
269 static ssize_t ad799x_write_frequency(struct device *dev,
270 struct device_attribute *attr,
271 const char *buf,
272 size_t len)
273 {
274 struct iio_dev *dev_info = dev_get_drvdata(dev);
275 struct ad799x_state *st = iio_dev_get_devdata(dev_info);
276
277 long val;
278 int ret;
279 u8 t;
280
281 ret = strict_strtol(buf, 10, &val);
282 if (ret)
283 return ret;
284
285 mutex_lock(&dev_info->mlock);
286 ret = ad799x_i2c_read8(st, AD7998_CYCLE_TMR_REG, &t);
287 if (ret)
288 goto error_ret_mutex;
289 /* Wipe the bits clean */
290 t &= ~AD7998_CYC_MASK;
291
292 switch (val) {
293 case 15625:
294 t |= AD7998_CYC_TCONF_32;
295 break;
296 case 7812:
297 t |= AD7998_CYC_TCONF_64;
298 break;
299 case 3906:
300 t |= AD7998_CYC_TCONF_128;
301 break;
302 case 1953:
303 t |= AD7998_CYC_TCONF_256;
304 break;
305 case 976:
306 t |= AD7998_CYC_TCONF_512;
307 break;
308 case 488:
309 t |= AD7998_CYC_TCONF_1024;
310 break;
311 case 244:
312 t |= AD7998_CYC_TCONF_2048;
313 break;
314 case 0:
315 t |= AD7998_CYC_DIS;
316 break;
317 default:
318 ret = -EINVAL;
319 goto error_ret_mutex;
320 }
321
322 ret = ad799x_i2c_write8(st, AD7998_CYCLE_TMR_REG, t);
323
324 error_ret_mutex:
325 mutex_unlock(&dev_info->mlock);
326
327 return ret ? ret : len;
328 }
329
330
331 static ssize_t ad799x_read_channel_config(struct device *dev,
332 struct device_attribute *attr,
333 char *buf)
334 {
335 struct iio_dev *dev_info = dev_get_drvdata(dev);
336 struct ad799x_state *st = iio_dev_get_devdata(dev_info);
337 struct iio_event_attr *this_attr = to_iio_event_attr(attr);
338
339 int ret;
340 u16 val;
341 ret = ad799x_i2c_read16(st, this_attr->mask, &val);
342 if (ret)
343 return ret;
344
345 return sprintf(buf, "%d\n", val);
346 }
347
348 static ssize_t ad799x_write_channel_config(struct device *dev,
349 struct device_attribute *attr,
350 const char *buf,
351 size_t len)
352 {
353 struct iio_dev *dev_info = dev_get_drvdata(dev);
354 struct ad799x_state *st = iio_dev_get_devdata(dev_info);
355 struct iio_event_attr *this_attr = to_iio_event_attr(attr);
356
357 long val;
358 int ret;
359
360 ret = strict_strtol(buf, 10, &val);
361 if (ret)
362 return ret;
363
364 mutex_lock(&dev_info->mlock);
365 ret = ad799x_i2c_write16(st, this_attr->mask, val);
366 mutex_unlock(&dev_info->mlock);
367
368 return ret ? ret : len;
369 }
370
371 static void ad799x_interrupt_bh(struct work_struct *work_s)
372 {
373 struct ad799x_state *st = container_of(work_s,
374 struct ad799x_state, work_thresh);
375 u8 status;
376 int i;
377
378 if (ad799x_i2c_read8(st, AD7998_ALERT_STAT_REG, &status))
379 goto err_out;
380
381 if (!status)
382 goto err_out;
383
384 ad799x_i2c_write8(st, AD7998_ALERT_STAT_REG, AD7998_ALERT_STAT_CLEAR);
385
386 for (i = 0; i < 8; i++) {
387 if (status & (1 << i))
388 iio_push_event(st->indio_dev, 0,
389 i & 0x1 ?
390 IIO_EVENT_CODE_IN_HIGH_THRESH(i >> 1) :
391 IIO_EVENT_CODE_IN_LOW_THRESH(i >> 1),
392 st->last_timestamp);
393 }
394
395 err_out:
396 enable_irq(st->client->irq);
397 }
398
399 static int ad799x_interrupt(struct iio_dev *dev_info,
400 int index,
401 s64 timestamp,
402 int no_test)
403 {
404 struct ad799x_state *st = dev_info->dev_data;
405
406 st->last_timestamp = timestamp;
407 schedule_work(&st->work_thresh);
408 return 0;
409 }
410
411 IIO_EVENT_SH(ad799x, &ad799x_interrupt);
412
413 /* Direct read attribtues */
414 static IIO_DEV_ATTR_IN_RAW(0, ad799x_read_single_channel, 0);
415 static IIO_DEV_ATTR_IN_RAW(1, ad799x_read_single_channel, 1);
416 static IIO_DEV_ATTR_IN_RAW(2, ad799x_read_single_channel, 2);
417 static IIO_DEV_ATTR_IN_RAW(3, ad799x_read_single_channel, 3);
418 static IIO_DEV_ATTR_IN_RAW(4, ad799x_read_single_channel, 4);
419 static IIO_DEV_ATTR_IN_RAW(5, ad799x_read_single_channel, 5);
420 static IIO_DEV_ATTR_IN_RAW(6, ad799x_read_single_channel, 6);
421 static IIO_DEV_ATTR_IN_RAW(7, ad799x_read_single_channel, 7);
422
423 static ssize_t ad799x_show_scale(struct device *dev,
424 struct device_attribute *attr,
425 char *buf)
426 {
427 /* Driver currently only support internal vref */
428 struct iio_dev *dev_info = dev_get_drvdata(dev);
429 struct ad799x_state *st = iio_dev_get_devdata(dev_info);
430 /* Corresponds to Vref / 2^(bits) */
431
432 if ((1 << (st->chip_info->bits + 1))
433 > st->int_vref_mv)
434 return sprintf(buf, "0.5\n");
435 else
436 return sprintf(buf, "%d\n",
437 st->int_vref_mv >> st->chip_info->bits);
438 }
439
440 static IIO_DEVICE_ATTR(in_scale, S_IRUGO, ad799x_show_scale, NULL, 0);
441
442 static ssize_t ad799x_show_name(struct device *dev,
443 struct device_attribute *attr,
444 char *buf)
445 {
446 struct iio_dev *dev_info = dev_get_drvdata(dev);
447 struct ad799x_state *st = iio_dev_get_devdata(dev_info);
448 return sprintf(buf, "%s\n", st->client->name);
449 }
450
451 static IIO_DEVICE_ATTR(name, S_IRUGO, ad799x_show_name, NULL, 0);
452
453 static struct attribute *ad7991_5_9_3_4_device_attrs[] = {
454 &iio_dev_attr_in0_raw.dev_attr.attr,
455 &iio_dev_attr_in1_raw.dev_attr.attr,
456 &iio_dev_attr_in2_raw.dev_attr.attr,
457 &iio_dev_attr_in3_raw.dev_attr.attr,
458 &iio_dev_attr_name.dev_attr.attr,
459 &iio_dev_attr_in_scale.dev_attr.attr,
460 NULL
461 };
462
463 static struct attribute_group ad7991_5_9_3_4_dev_attr_group = {
464 .attrs = ad7991_5_9_3_4_device_attrs,
465 };
466
467 static struct attribute *ad7991_5_9_3_4_scan_el_attrs[] = {
468 &iio_scan_el_in0.dev_attr.attr,
469 &iio_const_attr_in0_index.dev_attr.attr,
470 &iio_scan_el_in1.dev_attr.attr,
471 &iio_const_attr_in1_index.dev_attr.attr,
472 &iio_scan_el_in2.dev_attr.attr,
473 &iio_const_attr_in2_index.dev_attr.attr,
474 &iio_scan_el_in3.dev_attr.attr,
475 &iio_const_attr_in3_index.dev_attr.attr,
476 &iio_dev_attr_in_precision.dev_attr.attr,
477 NULL,
478 };
479
480 static struct attribute_group ad7991_5_9_3_4_scan_el_group = {
481 .name = "scan_elements",
482 .attrs = ad7991_5_9_3_4_scan_el_attrs,
483 };
484
485 static struct attribute *ad7992_device_attrs[] = {
486 &iio_dev_attr_in0_raw.dev_attr.attr,
487 &iio_dev_attr_in1_raw.dev_attr.attr,
488 &iio_dev_attr_name.dev_attr.attr,
489 &iio_dev_attr_in_scale.dev_attr.attr,
490 NULL
491 };
492
493 static struct attribute_group ad7992_dev_attr_group = {
494 .attrs = ad7992_device_attrs,
495 };
496
497 static struct attribute *ad7992_scan_el_attrs[] = {
498 &iio_scan_el_in0.dev_attr.attr,
499 &iio_const_attr_in0_index.dev_attr.attr,
500 &iio_scan_el_in1.dev_attr.attr,
501 &iio_const_attr_in1_index.dev_attr.attr,
502 &iio_dev_attr_in_precision.dev_attr.attr,
503 NULL,
504 };
505
506 static struct attribute_group ad7992_scan_el_group = {
507 .name = "scan_elements",
508 .attrs = ad7992_scan_el_attrs,
509 };
510
511 static struct attribute *ad7997_8_device_attrs[] = {
512 &iio_dev_attr_in0_raw.dev_attr.attr,
513 &iio_dev_attr_in1_raw.dev_attr.attr,
514 &iio_dev_attr_in2_raw.dev_attr.attr,
515 &iio_dev_attr_in3_raw.dev_attr.attr,
516 &iio_dev_attr_in4_raw.dev_attr.attr,
517 &iio_dev_attr_in5_raw.dev_attr.attr,
518 &iio_dev_attr_in6_raw.dev_attr.attr,
519 &iio_dev_attr_in7_raw.dev_attr.attr,
520 &iio_dev_attr_name.dev_attr.attr,
521 &iio_dev_attr_in_scale.dev_attr.attr,
522 NULL
523 };
524
525 static struct attribute_group ad7997_8_dev_attr_group = {
526 .attrs = ad7997_8_device_attrs,
527 };
528
529 static struct attribute *ad7997_8_scan_el_attrs[] = {
530 &iio_scan_el_in0.dev_attr.attr,
531 &iio_const_attr_in0_index.dev_attr.attr,
532 &iio_scan_el_in1.dev_attr.attr,
533 &iio_const_attr_in1_index.dev_attr.attr,
534 &iio_scan_el_in2.dev_attr.attr,
535 &iio_const_attr_in2_index.dev_attr.attr,
536 &iio_scan_el_in3.dev_attr.attr,
537 &iio_const_attr_in3_index.dev_attr.attr,
538 &iio_scan_el_in4.dev_attr.attr,
539 &iio_const_attr_in4_index.dev_attr.attr,
540 &iio_scan_el_in5.dev_attr.attr,
541 &iio_const_attr_in5_index.dev_attr.attr,
542 &iio_scan_el_in6.dev_attr.attr,
543 &iio_const_attr_in6_index.dev_attr.attr,
544 &iio_scan_el_in7.dev_attr.attr,
545 &iio_const_attr_in7_index.dev_attr.attr,
546 &iio_dev_attr_in_precision.dev_attr.attr,
547 NULL,
548 };
549
550 static struct attribute_group ad7997_8_scan_el_group = {
551 .name = "scan_elements",
552 .attrs = ad7997_8_scan_el_attrs,
553 };
554
555 IIO_EVENT_ATTR_SH(in0_thresh_low_value,
556 iio_event_ad799x,
557 ad799x_read_channel_config,
558 ad799x_write_channel_config,
559 AD7998_DATALOW_CH1_REG);
560
561 IIO_EVENT_ATTR_SH(in0_thresh_high_value,
562 iio_event_ad799x,
563 ad799x_read_channel_config,
564 ad799x_write_channel_config,
565 AD7998_DATAHIGH_CH1_REG);
566
567 IIO_EVENT_ATTR_SH(in0_thresh_both_hyst_raw,
568 iio_event_ad799x,
569 ad799x_read_channel_config,
570 ad799x_write_channel_config,
571 AD7998_HYST_CH1_REG);
572
573 IIO_EVENT_ATTR_SH(in1_thresh_low_value,
574 iio_event_ad799x,
575 ad799x_read_channel_config,
576 ad799x_write_channel_config,
577 AD7998_DATALOW_CH2_REG);
578
579 IIO_EVENT_ATTR_SH(in1_thresh_high_value,
580 iio_event_ad799x,
581 ad799x_read_channel_config,
582 ad799x_write_channel_config,
583 AD7998_DATAHIGH_CH2_REG);
584
585 IIO_EVENT_ATTR_SH(in1_thresh_both_hyst_raw,
586 iio_event_ad799x,
587 ad799x_read_channel_config,
588 ad799x_write_channel_config,
589 AD7998_HYST_CH2_REG);
590
591 IIO_EVENT_ATTR_SH(in2_thresh_low_value,
592 iio_event_ad799x,
593 ad799x_read_channel_config,
594 ad799x_write_channel_config,
595 AD7998_DATALOW_CH3_REG);
596
597 IIO_EVENT_ATTR_SH(in2_thresh_high_value,
598 iio_event_ad799x,
599 ad799x_read_channel_config,
600 ad799x_write_channel_config,
601 AD7998_DATAHIGH_CH3_REG);
602
603 IIO_EVENT_ATTR_SH(in2_thresh_both_hyst_raw,
604 iio_event_ad799x,
605 ad799x_read_channel_config,
606 ad799x_write_channel_config,
607 AD7998_HYST_CH3_REG);
608
609 IIO_EVENT_ATTR_SH(in3_thresh_low_value,
610 iio_event_ad799x,
611 ad799x_read_channel_config,
612 ad799x_write_channel_config,
613 AD7998_DATALOW_CH4_REG);
614
615 IIO_EVENT_ATTR_SH(in3_thresh_high_value,
616 iio_event_ad799x,
617 ad799x_read_channel_config,
618 ad799x_write_channel_config,
619 AD7998_DATAHIGH_CH4_REG);
620
621 IIO_EVENT_ATTR_SH(in3_thresh_both_hyst_raw,
622 iio_event_ad799x,
623 ad799x_read_channel_config,
624 ad799x_write_channel_config,
625 AD7998_HYST_CH4_REG);
626
627 static IIO_DEV_ATTR_SAMP_FREQ(S_IWUSR | S_IRUGO,
628 ad799x_read_frequency,
629 ad799x_write_frequency);
630 static IIO_CONST_ATTR_SAMP_FREQ_AVAIL("15625 7812 3906 1953 976 488 244 0");
631
632 static struct attribute *ad7993_4_7_8_event_attributes[] = {
633 &iio_event_attr_in0_thresh_low_value.dev_attr.attr,
634 &iio_event_attr_in0_thresh_high_value.dev_attr.attr,
635 &iio_event_attr_in0_thresh_both_hyst_raw.dev_attr.attr,
636 &iio_event_attr_in1_thresh_low_value.dev_attr.attr,
637 &iio_event_attr_in1_thresh_high_value.dev_attr.attr,
638 &iio_event_attr_in1_thresh_both_hyst_raw.dev_attr.attr,
639 &iio_event_attr_in2_thresh_low_value.dev_attr.attr,
640 &iio_event_attr_in2_thresh_high_value.dev_attr.attr,
641 &iio_event_attr_in2_thresh_both_hyst_raw.dev_attr.attr,
642 &iio_event_attr_in3_thresh_low_value.dev_attr.attr,
643 &iio_event_attr_in3_thresh_high_value.dev_attr.attr,
644 &iio_event_attr_in3_thresh_both_hyst_raw.dev_attr.attr,
645 &iio_dev_attr_sampling_frequency.dev_attr.attr,
646 &iio_const_attr_sampling_frequency_available.dev_attr.attr,
647 NULL,
648 };
649
650 static struct attribute_group ad7993_4_7_8_event_attrs_group = {
651 .attrs = ad7993_4_7_8_event_attributes,
652 };
653
654 static struct attribute *ad7992_event_attributes[] = {
655 &iio_event_attr_in0_thresh_low_value.dev_attr.attr,
656 &iio_event_attr_in0_thresh_high_value.dev_attr.attr,
657 &iio_event_attr_in0_thresh_both_hyst_raw.dev_attr.attr,
658 &iio_event_attr_in1_thresh_low_value.dev_attr.attr,
659 &iio_event_attr_in1_thresh_high_value.dev_attr.attr,
660 &iio_event_attr_in1_thresh_both_hyst_raw.dev_attr.attr,
661 &iio_dev_attr_sampling_frequency.dev_attr.attr,
662 &iio_const_attr_sampling_frequency_available.dev_attr.attr,
663 NULL,
664 };
665
666 static struct attribute_group ad7992_event_attrs_group = {
667 .attrs = ad7992_event_attributes,
668 };
669
670 static const struct ad799x_chip_info ad799x_chip_info_tbl[] = {
671 [ad7991] = {
672 .num_inputs = 4,
673 .bits = 12,
674 .int_vref_mv = 4096,
675 .dev_attrs = &ad7991_5_9_3_4_dev_attr_group,
676 .scan_attrs = &ad7991_5_9_3_4_scan_el_group,
677 .ad799x_set_scan_mode = ad7991_5_9_set_scan_mode,
678 },
679 [ad7995] = {
680 .num_inputs = 4,
681 .bits = 10,
682 .int_vref_mv = 1024,
683 .dev_attrs = &ad7991_5_9_3_4_dev_attr_group,
684 .scan_attrs = &ad7991_5_9_3_4_scan_el_group,
685 .ad799x_set_scan_mode = ad7991_5_9_set_scan_mode,
686 },
687 [ad7999] = {
688 .num_inputs = 4,
689 .bits = 10,
690 .int_vref_mv = 1024,
691 .dev_attrs = &ad7991_5_9_3_4_dev_attr_group,
692 .scan_attrs = &ad7991_5_9_3_4_scan_el_group,
693 .ad799x_set_scan_mode = ad7991_5_9_set_scan_mode,
694 },
695 [ad7992] = {
696 .num_inputs = 2,
697 .bits = 12,
698 .int_vref_mv = 4096,
699 .monitor_mode = true,
700 .default_config = AD7998_ALERT_EN,
701 .dev_attrs = &ad7992_dev_attr_group,
702 .scan_attrs = &ad7992_scan_el_group,
703 .event_attrs = &ad7992_event_attrs_group,
704 .ad799x_set_scan_mode = ad7992_3_4_set_scan_mode,
705 },
706 [ad7993] = {
707 .num_inputs = 4,
708 .bits = 10,
709 .int_vref_mv = 1024,
710 .monitor_mode = true,
711 .default_config = AD7998_ALERT_EN,
712 .dev_attrs = &ad7991_5_9_3_4_dev_attr_group,
713 .scan_attrs = &ad7991_5_9_3_4_scan_el_group,
714 .event_attrs = &ad7993_4_7_8_event_attrs_group,
715 .ad799x_set_scan_mode = ad7992_3_4_set_scan_mode,
716 },
717 [ad7994] = {
718 .num_inputs = 4,
719 .bits = 12,
720 .int_vref_mv = 4096,
721 .monitor_mode = true,
722 .default_config = AD7998_ALERT_EN,
723 .dev_attrs = &ad7991_5_9_3_4_dev_attr_group,
724 .scan_attrs = &ad7991_5_9_3_4_scan_el_group,
725 .event_attrs = &ad7993_4_7_8_event_attrs_group,
726 .ad799x_set_scan_mode = ad7992_3_4_set_scan_mode,
727 },
728 [ad7997] = {
729 .num_inputs = 8,
730 .bits = 10,
731 .int_vref_mv = 1024,
732 .monitor_mode = true,
733 .default_config = AD7998_ALERT_EN,
734 .dev_attrs = &ad7997_8_dev_attr_group,
735 .scan_attrs = &ad7997_8_scan_el_group,
736 .event_attrs = &ad7993_4_7_8_event_attrs_group,
737 .ad799x_set_scan_mode = ad7997_8_set_scan_mode,
738 },
739 [ad7998] = {
740 .num_inputs = 8,
741 .bits = 12,
742 .int_vref_mv = 4096,
743 .monitor_mode = true,
744 .default_config = AD7998_ALERT_EN,
745 .dev_attrs = &ad7997_8_dev_attr_group,
746 .scan_attrs = &ad7997_8_scan_el_group,
747 .event_attrs = &ad7993_4_7_8_event_attrs_group,
748 .ad799x_set_scan_mode = ad7997_8_set_scan_mode,
749 },
750 };
751
752 static int __devinit ad799x_probe(struct i2c_client *client,
753 const struct i2c_device_id *id)
754 {
755 int ret, regdone = 0;
756 struct ad799x_platform_data *pdata = client->dev.platform_data;
757 struct ad799x_state *st = kzalloc(sizeof(*st), GFP_KERNEL);
758 if (st == NULL) {
759 ret = -ENOMEM;
760 goto error_ret;
761 }
762
763 /* this is only used for device removal purposes */
764 i2c_set_clientdata(client, st);
765
766 atomic_set(&st->protect_ring, 0);
767 st->id = id->driver_data;
768 st->chip_info = &ad799x_chip_info_tbl[st->id];
769 st->config = st->chip_info->default_config;
770
771 /* TODO: Add pdata options for filtering and bit delay */
772
773 if (pdata)
774 st->int_vref_mv = pdata->vref_mv;
775 else
776 st->int_vref_mv = st->chip_info->int_vref_mv;
777
778 st->reg = regulator_get(&client->dev, "vcc");
779 if (!IS_ERR(st->reg)) {
780 ret = regulator_enable(st->reg);
781 if (ret)
782 goto error_put_reg;
783 }
784 st->client = client;
785
786 st->indio_dev = iio_allocate_device();
787 if (st->indio_dev == NULL) {
788 ret = -ENOMEM;
789 goto error_disable_reg;
790 }
791
792 /* Estabilish that the iio_dev is a child of the i2c device */
793 st->indio_dev->dev.parent = &client->dev;
794 st->indio_dev->attrs = st->chip_info->dev_attrs;
795 st->indio_dev->event_attrs = st->chip_info->event_attrs;
796
797 st->indio_dev->dev_data = (void *)(st);
798 st->indio_dev->driver_module = THIS_MODULE;
799 st->indio_dev->modes = INDIO_DIRECT_MODE;
800 st->indio_dev->num_interrupt_lines = 1;
801
802 ret = ad799x_set_scan_mode(st, 0);
803 if (ret)
804 goto error_free_device;
805
806 ret = ad799x_register_ring_funcs_and_init(st->indio_dev);
807 if (ret)
808 goto error_free_device;
809
810 ret = iio_device_register(st->indio_dev);
811 if (ret)
812 goto error_cleanup_ring;
813 regdone = 1;
814
815 ret = iio_ring_buffer_register(st->indio_dev->ring, 0);
816 if (ret)
817 goto error_cleanup_ring;
818
819 if (client->irq > 0 && st->chip_info->monitor_mode) {
820 INIT_WORK(&st->work_thresh, ad799x_interrupt_bh);
821
822 ret = iio_register_interrupt_line(client->irq,
823 st->indio_dev,
824 0,
825 IRQF_TRIGGER_FALLING,
826 client->name);
827 if (ret)
828 goto error_cleanup_ring;
829
830 /*
831 * The event handler list element refer to iio_event_ad799x.
832 * All event attributes bind to the same event handler.
833 * So, only register event handler once.
834 */
835 iio_add_event_to_list(&iio_event_ad799x,
836 &st->indio_dev->interrupts[0]->ev_list);
837 }
838
839 return 0;
840 error_cleanup_ring:
841 ad799x_ring_cleanup(st->indio_dev);
842 error_free_device:
843 if (!regdone)
844 iio_free_device(st->indio_dev);
845 else
846 iio_device_unregister(st->indio_dev);
847 error_disable_reg:
848 if (!IS_ERR(st->reg))
849 regulator_disable(st->reg);
850 error_put_reg:
851 if (!IS_ERR(st->reg))
852 regulator_put(st->reg);
853 kfree(st);
854 error_ret:
855 return ret;
856 }
857
858 static __devexit int ad799x_remove(struct i2c_client *client)
859 {
860 struct ad799x_state *st = i2c_get_clientdata(client);
861 struct iio_dev *indio_dev = st->indio_dev;
862
863 if (client->irq > 0 && st->chip_info->monitor_mode)
864 iio_unregister_interrupt_line(indio_dev, 0);
865
866 iio_ring_buffer_unregister(indio_dev->ring);
867 ad799x_ring_cleanup(indio_dev);
868 iio_device_unregister(indio_dev);
869 if (!IS_ERR(st->reg)) {
870 regulator_disable(st->reg);
871 regulator_put(st->reg);
872 }
873 kfree(st);
874
875 return 0;
876 }
877
878 static const struct i2c_device_id ad799x_id[] = {
879 { "ad7991", ad7991 },
880 { "ad7995", ad7995 },
881 { "ad7999", ad7999 },
882 { "ad7992", ad7992 },
883 { "ad7993", ad7993 },
884 { "ad7994", ad7994 },
885 { "ad7997", ad7997 },
886 { "ad7998", ad7998 },
887 {}
888 };
889
890 MODULE_DEVICE_TABLE(i2c, ad799x_id);
891
892 static struct i2c_driver ad799x_driver = {
893 .driver = {
894 .name = "ad799x",
895 },
896 .probe = ad799x_probe,
897 .remove = __devexit_p(ad799x_remove),
898 .id_table = ad799x_id,
899 };
900
901 static __init int ad799x_init(void)
902 {
903 return i2c_add_driver(&ad799x_driver);
904 }
905
906 static __exit void ad799x_exit(void)
907 {
908 i2c_del_driver(&ad799x_driver);
909 }
910
911 MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>");
912 MODULE_DESCRIPTION("Analog Devices AD799x ADC");
913 MODULE_LICENSE("GPL v2");
914 MODULE_ALIAS("i2c:ad799x");
915
916 module_init(ad799x_init);
917 module_exit(ad799x_exit);
Linux kernel - Deliverables
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