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iio: Fixpoint formatted output bugfix
[linux-2.6/btrfs-unstable.git] / drivers / staging / iio / adc / ad799x_core.c
blob89ccf375a188c79fa586dc9036d7763e2d6d655c
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_type(struct device *dev,
127 struct device_attribute *attr,
128 char *buf)
129 {
130 struct iio_ring_buffer *ring = dev_get_drvdata(dev);
131 struct iio_dev *indio_dev = ring->indio_dev;
132 struct ad799x_state *st = indio_dev->dev_data;
133
134 return sprintf(buf, "%c%d/%d\n", st->chip_info->sign,
135 st->chip_info->bits, AD799X_STORAGEBITS);
136 }
137 static IIO_DEVICE_ATTR(in_type, S_IRUGO, ad799x_show_type, NULL, 0);
138
139 static int ad7991_5_9_set_scan_mode(struct ad799x_state *st, unsigned mask)
140 {
141 return i2c_smbus_write_byte(st->client,
142 st->config | (mask << AD799X_CHANNEL_SHIFT));
143 }
144
145 static int ad7992_3_4_set_scan_mode(struct ad799x_state *st, unsigned mask)
146 {
147 return ad799x_i2c_write8(st, AD7998_CONF_REG,
148 st->config | (mask << AD799X_CHANNEL_SHIFT));
149 }
150
151 static int ad7997_8_set_scan_mode(struct ad799x_state *st, unsigned mask)
152 {
153 return ad799x_i2c_write16(st, AD7998_CONF_REG,
154 st->config | (mask << AD799X_CHANNEL_SHIFT));
155 }
156
157 int ad799x_set_scan_mode(struct ad799x_state *st, unsigned mask)
158 {
159 int ret;
160
161 if (st->chip_info->ad799x_set_scan_mode != NULL) {
162 ret = st->chip_info->ad799x_set_scan_mode(st, mask);
163 return (ret > 0) ? 0 : ret;
164 }
165
166 return 0;
167 }
168
169 static ssize_t ad799x_read_single_channel(struct device *dev,
170 struct device_attribute *attr,
171 char *buf)
172 {
173 struct iio_dev *dev_info = dev_get_drvdata(dev);
174 struct ad799x_state *st = iio_dev_get_devdata(dev_info);
175 struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
176 int ret = 0, len = 0;
177 u32 data ;
178 u16 rxbuf[1];
179 u8 cmd;
180 long mask;
181
182 mutex_lock(&dev_info->mlock);
183 mask = 1 << this_attr->address;
184 /* If ring buffer capture is occuring, query the buffer */
185 if (iio_ring_enabled(dev_info)) {
186 data = ret = ad799x_single_channel_from_ring(st, mask);
187 if (ret < 0)
188 goto error_ret;
189 ret = 0;
190 } else {
191 switch (st->id) {
192 case ad7991:
193 case ad7995:
194 case ad7999:
195 cmd = st->config | (mask << AD799X_CHANNEL_SHIFT);
196 break;
197 case ad7992:
198 case ad7993:
199 case ad7994:
200 cmd = mask << AD799X_CHANNEL_SHIFT;
201 break;
202 case ad7997:
203 case ad7998:
204 cmd = (this_attr->address <<
205 AD799X_CHANNEL_SHIFT) | AD7997_8_READ_SINGLE;
206 break;
207 default:
208 cmd = 0;
209
210 }
211 ret = ad799x_i2c_read16(st, cmd, rxbuf);
212 if (ret < 0)
213 goto error_ret;
214
215 data = rxbuf[0];
216 }
217
218 /* Pretty print the result */
219 len = sprintf(buf, "%u\n", data & ((1 << (st->chip_info->bits)) - 1));
220
221 error_ret:
222 mutex_unlock(&dev_info->mlock);
223 return ret ? ret : len;
224 }
225
226 static ssize_t ad799x_read_frequency(struct device *dev,
227 struct device_attribute *attr,
228 char *buf)
229 {
230 struct iio_dev *dev_info = dev_get_drvdata(dev);
231 struct ad799x_state *st = iio_dev_get_devdata(dev_info);
232
233 int ret, len = 0;
234 u8 val;
235 ret = ad799x_i2c_read8(st, AD7998_CYCLE_TMR_REG, &val);
236 if (ret)
237 return ret;
238
239 val &= AD7998_CYC_MASK;
240
241 switch (val) {
242 case AD7998_CYC_DIS:
243 len = sprintf(buf, "0\n");
244 break;
245 case AD7998_CYC_TCONF_32:
246 len = sprintf(buf, "15625\n");
247 break;
248 case AD7998_CYC_TCONF_64:
249 len = sprintf(buf, "7812\n");
250 break;
251 case AD7998_CYC_TCONF_128:
252 len = sprintf(buf, "3906\n");
253 break;
254 case AD7998_CYC_TCONF_256:
255 len = sprintf(buf, "1953\n");
256 break;
257 case AD7998_CYC_TCONF_512:
258 len = sprintf(buf, "976\n");
259 break;
260 case AD7998_CYC_TCONF_1024:
261 len = sprintf(buf, "488\n");
262 break;
263 case AD7998_CYC_TCONF_2048:
264 len = sprintf(buf, "244\n");
265 break;
266 }
267 return len;
268 }
269
270 static ssize_t ad799x_write_frequency(struct device *dev,
271 struct device_attribute *attr,
272 const char *buf,
273 size_t len)
274 {
275 struct iio_dev *dev_info = dev_get_drvdata(dev);
276 struct ad799x_state *st = iio_dev_get_devdata(dev_info);
277
278 long val;
279 int ret;
280 u8 t;
281
282 ret = strict_strtol(buf, 10, &val);
283 if (ret)
284 return ret;
285
286 mutex_lock(&dev_info->mlock);
287 ret = ad799x_i2c_read8(st, AD7998_CYCLE_TMR_REG, &t);
288 if (ret)
289 goto error_ret_mutex;
290 /* Wipe the bits clean */
291 t &= ~AD7998_CYC_MASK;
292
293 switch (val) {
294 case 15625:
295 t |= AD7998_CYC_TCONF_32;
296 break;
297 case 7812:
298 t |= AD7998_CYC_TCONF_64;
299 break;
300 case 3906:
301 t |= AD7998_CYC_TCONF_128;
302 break;
303 case 1953:
304 t |= AD7998_CYC_TCONF_256;
305 break;
306 case 976:
307 t |= AD7998_CYC_TCONF_512;
308 break;
309 case 488:
310 t |= AD7998_CYC_TCONF_1024;
311 break;
312 case 244:
313 t |= AD7998_CYC_TCONF_2048;
314 break;
315 case 0:
316 t |= AD7998_CYC_DIS;
317 break;
318 default:
319 ret = -EINVAL;
320 goto error_ret_mutex;
321 }
322
323 ret = ad799x_i2c_write8(st, AD7998_CYCLE_TMR_REG, t);
324
325 error_ret_mutex:
326 mutex_unlock(&dev_info->mlock);
327
328 return ret ? ret : len;
329 }
330
331
332 static ssize_t ad799x_read_channel_config(struct device *dev,
333 struct device_attribute *attr,
334 char *buf)
335 {
336 struct iio_dev *dev_info = dev_get_drvdata(dev);
337 struct ad799x_state *st = iio_dev_get_devdata(dev_info);
338 struct iio_event_attr *this_attr = to_iio_event_attr(attr);
339
340 int ret;
341 u16 val;
342 ret = ad799x_i2c_read16(st, this_attr->mask, &val);
343 if (ret)
344 return ret;
345
346 return sprintf(buf, "%d\n", val);
347 }
348
349 static ssize_t ad799x_write_channel_config(struct device *dev,
350 struct device_attribute *attr,
351 const char *buf,
352 size_t len)
353 {
354 struct iio_dev *dev_info = dev_get_drvdata(dev);
355 struct ad799x_state *st = iio_dev_get_devdata(dev_info);
356 struct iio_event_attr *this_attr = to_iio_event_attr(attr);
357
358 long val;
359 int ret;
360
361 ret = strict_strtol(buf, 10, &val);
362 if (ret)
363 return ret;
364
365 mutex_lock(&dev_info->mlock);
366 ret = ad799x_i2c_write16(st, this_attr->mask, val);
367 mutex_unlock(&dev_info->mlock);
368
369 return ret ? ret : len;
370 }
371
372 static void ad799x_interrupt_bh(struct work_struct *work_s)
373 {
374 struct ad799x_state *st = container_of(work_s,
375 struct ad799x_state, work_thresh);
376 u8 status;
377 int i;
378
379 if (ad799x_i2c_read8(st, AD7998_ALERT_STAT_REG, &status))
380 goto err_out;
381
382 if (!status)
383 goto err_out;
384
385 ad799x_i2c_write8(st, AD7998_ALERT_STAT_REG, AD7998_ALERT_STAT_CLEAR);
386
387 for (i = 0; i < 8; i++) {
388 if (status & (1 << i))
389 iio_push_event(st->indio_dev, 0,
390 i & 0x1 ?
391 IIO_EVENT_CODE_IN_HIGH_THRESH(i >> 1) :
392 IIO_EVENT_CODE_IN_LOW_THRESH(i >> 1),
393 st->last_timestamp);
394 }
395
396 err_out:
397 enable_irq(st->client->irq);
398 }
399
400 static int ad799x_interrupt(struct iio_dev *dev_info,
401 int index,
402 s64 timestamp,
403 int no_test)
404 {
405 struct ad799x_state *st = dev_info->dev_data;
406
407 st->last_timestamp = timestamp;
408 schedule_work(&st->work_thresh);
409 return 0;
410 }
411
412 IIO_EVENT_SH(ad799x, &ad799x_interrupt);
413
414 /* Direct read attribtues */
415 static IIO_DEV_ATTR_IN_RAW(0, ad799x_read_single_channel, 0);
416 static IIO_DEV_ATTR_IN_RAW(1, ad799x_read_single_channel, 1);
417 static IIO_DEV_ATTR_IN_RAW(2, ad799x_read_single_channel, 2);
418 static IIO_DEV_ATTR_IN_RAW(3, ad799x_read_single_channel, 3);
419 static IIO_DEV_ATTR_IN_RAW(4, ad799x_read_single_channel, 4);
420 static IIO_DEV_ATTR_IN_RAW(5, ad799x_read_single_channel, 5);
421 static IIO_DEV_ATTR_IN_RAW(6, ad799x_read_single_channel, 6);
422 static IIO_DEV_ATTR_IN_RAW(7, ad799x_read_single_channel, 7);
423
424 static ssize_t ad799x_show_scale(struct device *dev,
425 struct device_attribute *attr,
426 char *buf)
427 {
428 /* Driver currently only support internal vref */
429 struct iio_dev *dev_info = dev_get_drvdata(dev);
430 struct ad799x_state *st = iio_dev_get_devdata(dev_info);
431
432 /* Corresponds to Vref / 2^(bits) */
433 unsigned int scale_uv = (st->int_vref_mv * 1000) >> st->chip_info->bits;
434
435 return sprintf(buf, "%d.%03d\n", scale_uv / 1000, scale_uv % 1000);
436 }
437
438 static IIO_DEVICE_ATTR(in_scale, S_IRUGO, ad799x_show_scale, NULL, 0);
439
440 static ssize_t ad799x_show_name(struct device *dev,
441 struct device_attribute *attr,
442 char *buf)
443 {
444 struct iio_dev *dev_info = dev_get_drvdata(dev);
445 struct ad799x_state *st = iio_dev_get_devdata(dev_info);
446 return sprintf(buf, "%s\n", st->client->name);
447 }
448
449 static IIO_DEVICE_ATTR(name, S_IRUGO, ad799x_show_name, NULL, 0);
450
451 static struct attribute *ad7991_5_9_3_4_device_attrs[] = {
452 &iio_dev_attr_in0_raw.dev_attr.attr,
453 &iio_dev_attr_in1_raw.dev_attr.attr,
454 &iio_dev_attr_in2_raw.dev_attr.attr,
455 &iio_dev_attr_in3_raw.dev_attr.attr,
456 &iio_dev_attr_name.dev_attr.attr,
457 &iio_dev_attr_in_scale.dev_attr.attr,
458 NULL
459 };
460
461 static struct attribute_group ad7991_5_9_3_4_dev_attr_group = {
462 .attrs = ad7991_5_9_3_4_device_attrs,
463 };
464
465 static struct attribute *ad7991_5_9_3_4_scan_el_attrs[] = {
466 &iio_scan_el_in0.dev_attr.attr,
467 &iio_const_attr_in0_index.dev_attr.attr,
468 &iio_scan_el_in1.dev_attr.attr,
469 &iio_const_attr_in1_index.dev_attr.attr,
470 &iio_scan_el_in2.dev_attr.attr,
471 &iio_const_attr_in2_index.dev_attr.attr,
472 &iio_scan_el_in3.dev_attr.attr,
473 &iio_const_attr_in3_index.dev_attr.attr,
474 &iio_dev_attr_in_type.dev_attr.attr,
475 NULL,
476 };
477
478 static struct attribute_group ad7991_5_9_3_4_scan_el_group = {
479 .name = "scan_elements",
480 .attrs = ad7991_5_9_3_4_scan_el_attrs,
481 };
482
483 static struct attribute *ad7992_device_attrs[] = {
484 &iio_dev_attr_in0_raw.dev_attr.attr,
485 &iio_dev_attr_in1_raw.dev_attr.attr,
486 &iio_dev_attr_name.dev_attr.attr,
487 &iio_dev_attr_in_scale.dev_attr.attr,
488 NULL
489 };
490
491 static struct attribute_group ad7992_dev_attr_group = {
492 .attrs = ad7992_device_attrs,
493 };
494
495 static struct attribute *ad7992_scan_el_attrs[] = {
496 &iio_scan_el_in0.dev_attr.attr,
497 &iio_const_attr_in0_index.dev_attr.attr,
498 &iio_scan_el_in1.dev_attr.attr,
499 &iio_const_attr_in1_index.dev_attr.attr,
500 &iio_dev_attr_in_type.dev_attr.attr,
501 NULL,
502 };
503
504 static struct attribute_group ad7992_scan_el_group = {
505 .name = "scan_elements",
506 .attrs = ad7992_scan_el_attrs,
507 };
508
509 static struct attribute *ad7997_8_device_attrs[] = {
510 &iio_dev_attr_in0_raw.dev_attr.attr,
511 &iio_dev_attr_in1_raw.dev_attr.attr,
512 &iio_dev_attr_in2_raw.dev_attr.attr,
513 &iio_dev_attr_in3_raw.dev_attr.attr,
514 &iio_dev_attr_in4_raw.dev_attr.attr,
515 &iio_dev_attr_in5_raw.dev_attr.attr,
516 &iio_dev_attr_in6_raw.dev_attr.attr,
517 &iio_dev_attr_in7_raw.dev_attr.attr,
518 &iio_dev_attr_name.dev_attr.attr,
519 &iio_dev_attr_in_scale.dev_attr.attr,
520 NULL
521 };
522
523 static struct attribute_group ad7997_8_dev_attr_group = {
524 .attrs = ad7997_8_device_attrs,
525 };
526
527 static struct attribute *ad7997_8_scan_el_attrs[] = {
528 &iio_scan_el_in0.dev_attr.attr,
529 &iio_const_attr_in0_index.dev_attr.attr,
530 &iio_scan_el_in1.dev_attr.attr,
531 &iio_const_attr_in1_index.dev_attr.attr,
532 &iio_scan_el_in2.dev_attr.attr,
533 &iio_const_attr_in2_index.dev_attr.attr,
534 &iio_scan_el_in3.dev_attr.attr,
535 &iio_const_attr_in3_index.dev_attr.attr,
536 &iio_scan_el_in4.dev_attr.attr,
537 &iio_const_attr_in4_index.dev_attr.attr,
538 &iio_scan_el_in5.dev_attr.attr,
539 &iio_const_attr_in5_index.dev_attr.attr,
540 &iio_scan_el_in6.dev_attr.attr,
541 &iio_const_attr_in6_index.dev_attr.attr,
542 &iio_scan_el_in7.dev_attr.attr,
543 &iio_const_attr_in7_index.dev_attr.attr,
544 &iio_dev_attr_in_type.dev_attr.attr,
545 NULL,
546 };
547
548 static struct attribute_group ad7997_8_scan_el_group = {
549 .name = "scan_elements",
550 .attrs = ad7997_8_scan_el_attrs,
551 };
552
553 IIO_EVENT_ATTR_SH(in0_thresh_low_value,
554 iio_event_ad799x,
555 ad799x_read_channel_config,
556 ad799x_write_channel_config,
557 AD7998_DATALOW_CH1_REG);
558
559 IIO_EVENT_ATTR_SH(in0_thresh_high_value,
560 iio_event_ad799x,
561 ad799x_read_channel_config,
562 ad799x_write_channel_config,
563 AD7998_DATAHIGH_CH1_REG);
564
565 IIO_EVENT_ATTR_SH(in0_thresh_both_hyst_raw,
566 iio_event_ad799x,
567 ad799x_read_channel_config,
568 ad799x_write_channel_config,
569 AD7998_HYST_CH1_REG);
570
571 IIO_EVENT_ATTR_SH(in1_thresh_low_value,
572 iio_event_ad799x,
573 ad799x_read_channel_config,
574 ad799x_write_channel_config,
575 AD7998_DATALOW_CH2_REG);
576
577 IIO_EVENT_ATTR_SH(in1_thresh_high_value,
578 iio_event_ad799x,
579 ad799x_read_channel_config,
580 ad799x_write_channel_config,
581 AD7998_DATAHIGH_CH2_REG);
582
583 IIO_EVENT_ATTR_SH(in1_thresh_both_hyst_raw,
584 iio_event_ad799x,
585 ad799x_read_channel_config,
586 ad799x_write_channel_config,
587 AD7998_HYST_CH2_REG);
588
589 IIO_EVENT_ATTR_SH(in2_thresh_low_value,
590 iio_event_ad799x,
591 ad799x_read_channel_config,
592 ad799x_write_channel_config,
593 AD7998_DATALOW_CH3_REG);
594
595 IIO_EVENT_ATTR_SH(in2_thresh_high_value,
596 iio_event_ad799x,
597 ad799x_read_channel_config,
598 ad799x_write_channel_config,
599 AD7998_DATAHIGH_CH3_REG);
600
601 IIO_EVENT_ATTR_SH(in2_thresh_both_hyst_raw,
602 iio_event_ad799x,
603 ad799x_read_channel_config,
604 ad799x_write_channel_config,
605 AD7998_HYST_CH3_REG);
606
607 IIO_EVENT_ATTR_SH(in3_thresh_low_value,
608 iio_event_ad799x,
609 ad799x_read_channel_config,
610 ad799x_write_channel_config,
611 AD7998_DATALOW_CH4_REG);
612
613 IIO_EVENT_ATTR_SH(in3_thresh_high_value,
614 iio_event_ad799x,
615 ad799x_read_channel_config,
616 ad799x_write_channel_config,
617 AD7998_DATAHIGH_CH4_REG);
618
619 IIO_EVENT_ATTR_SH(in3_thresh_both_hyst_raw,
620 iio_event_ad799x,
621 ad799x_read_channel_config,
622 ad799x_write_channel_config,
623 AD7998_HYST_CH4_REG);
624
625 static IIO_DEV_ATTR_SAMP_FREQ(S_IWUSR | S_IRUGO,
626 ad799x_read_frequency,
627 ad799x_write_frequency);
628 static IIO_CONST_ATTR_SAMP_FREQ_AVAIL("15625 7812 3906 1953 976 488 244 0");
629
630 static struct attribute *ad7993_4_7_8_event_attributes[] = {
631 &iio_event_attr_in0_thresh_low_value.dev_attr.attr,
632 &iio_event_attr_in0_thresh_high_value.dev_attr.attr,
633 &iio_event_attr_in0_thresh_both_hyst_raw.dev_attr.attr,
634 &iio_event_attr_in1_thresh_low_value.dev_attr.attr,
635 &iio_event_attr_in1_thresh_high_value.dev_attr.attr,
636 &iio_event_attr_in1_thresh_both_hyst_raw.dev_attr.attr,
637 &iio_event_attr_in2_thresh_low_value.dev_attr.attr,
638 &iio_event_attr_in2_thresh_high_value.dev_attr.attr,
639 &iio_event_attr_in2_thresh_both_hyst_raw.dev_attr.attr,
640 &iio_event_attr_in3_thresh_low_value.dev_attr.attr,
641 &iio_event_attr_in3_thresh_high_value.dev_attr.attr,
642 &iio_event_attr_in3_thresh_both_hyst_raw.dev_attr.attr,
643 &iio_dev_attr_sampling_frequency.dev_attr.attr,
644 &iio_const_attr_sampling_frequency_available.dev_attr.attr,
645 NULL,
646 };
647
648 static struct attribute_group ad7993_4_7_8_event_attrs_group = {
649 .attrs = ad7993_4_7_8_event_attributes,
650 };
651
652 static struct attribute *ad7992_event_attributes[] = {
653 &iio_event_attr_in0_thresh_low_value.dev_attr.attr,
654 &iio_event_attr_in0_thresh_high_value.dev_attr.attr,
655 &iio_event_attr_in0_thresh_both_hyst_raw.dev_attr.attr,
656 &iio_event_attr_in1_thresh_low_value.dev_attr.attr,
657 &iio_event_attr_in1_thresh_high_value.dev_attr.attr,
658 &iio_event_attr_in1_thresh_both_hyst_raw.dev_attr.attr,
659 &iio_dev_attr_sampling_frequency.dev_attr.attr,
660 &iio_const_attr_sampling_frequency_available.dev_attr.attr,
661 NULL,
662 };
663
664 static struct attribute_group ad7992_event_attrs_group = {
665 .attrs = ad7992_event_attributes,
666 };
667
668 static const struct ad799x_chip_info ad799x_chip_info_tbl[] = {
669 [ad7991] = {
670 .num_inputs = 4,
671 .bits = 12,
672 .sign = IIO_SCAN_EL_TYPE_UNSIGNED,
673 .int_vref_mv = 4096,
674 .dev_attrs = &ad7991_5_9_3_4_dev_attr_group,
675 .scan_attrs = &ad7991_5_9_3_4_scan_el_group,
676 .ad799x_set_scan_mode = ad7991_5_9_set_scan_mode,
677 },
678 [ad7995] = {
679 .num_inputs = 4,
680 .bits = 10,
681 .sign = IIO_SCAN_EL_TYPE_UNSIGNED,
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 .sign = IIO_SCAN_EL_TYPE_UNSIGNED,
691 .int_vref_mv = 1024,
692 .dev_attrs = &ad7991_5_9_3_4_dev_attr_group,
693 .scan_attrs = &ad7991_5_9_3_4_scan_el_group,
694 .ad799x_set_scan_mode = ad7991_5_9_set_scan_mode,
695 },
696 [ad7992] = {
697 .num_inputs = 2,
698 .bits = 12,
699 .sign = IIO_SCAN_EL_TYPE_UNSIGNED,
700 .int_vref_mv = 4096,
701 .monitor_mode = true,
702 .default_config = AD7998_ALERT_EN,
703 .dev_attrs = &ad7992_dev_attr_group,
704 .scan_attrs = &ad7992_scan_el_group,
705 .event_attrs = &ad7992_event_attrs_group,
706 .ad799x_set_scan_mode = ad7992_3_4_set_scan_mode,
707 },
708 [ad7993] = {
709 .num_inputs = 4,
710 .bits = 10,
711 .sign = IIO_SCAN_EL_TYPE_UNSIGNED,
712 .int_vref_mv = 1024,
713 .monitor_mode = true,
714 .default_config = AD7998_ALERT_EN,
715 .dev_attrs = &ad7991_5_9_3_4_dev_attr_group,
716 .scan_attrs = &ad7991_5_9_3_4_scan_el_group,
717 .event_attrs = &ad7993_4_7_8_event_attrs_group,
718 .ad799x_set_scan_mode = ad7992_3_4_set_scan_mode,
719 },
720 [ad7994] = {
721 .num_inputs = 4,
722 .bits = 12,
723 .sign = IIO_SCAN_EL_TYPE_UNSIGNED,
724 .int_vref_mv = 4096,
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 [ad7997] = {
733 .num_inputs = 8,
734 .bits = 10,
735 .sign = IIO_SCAN_EL_TYPE_UNSIGNED,
736 .int_vref_mv = 1024,
737 .monitor_mode = true,
738 .default_config = AD7998_ALERT_EN,
739 .dev_attrs = &ad7997_8_dev_attr_group,
740 .scan_attrs = &ad7997_8_scan_el_group,
741 .event_attrs = &ad7993_4_7_8_event_attrs_group,
742 .ad799x_set_scan_mode = ad7997_8_set_scan_mode,
743 },
744 [ad7998] = {
745 .num_inputs = 8,
746 .bits = 12,
747 .sign = IIO_SCAN_EL_TYPE_UNSIGNED,
748 .int_vref_mv = 4096,
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 };
757
758 static int __devinit ad799x_probe(struct i2c_client *client,
759 const struct i2c_device_id *id)
760 {
761 int ret, regdone = 0;
762 struct ad799x_platform_data *pdata = client->dev.platform_data;
763 struct ad799x_state *st = kzalloc(sizeof(*st), GFP_KERNEL);
764 if (st == NULL) {
765 ret = -ENOMEM;
766 goto error_ret;
767 }
768
769 /* this is only used for device removal purposes */
770 i2c_set_clientdata(client, st);
771
772 atomic_set(&st->protect_ring, 0);
773 st->id = id->driver_data;
774 st->chip_info = &ad799x_chip_info_tbl[st->id];
775 st->config = st->chip_info->default_config;
776
777 /* TODO: Add pdata options for filtering and bit delay */
778
779 if (pdata)
780 st->int_vref_mv = pdata->vref_mv;
781 else
782 st->int_vref_mv = st->chip_info->int_vref_mv;
783
784 st->reg = regulator_get(&client->dev, "vcc");
785 if (!IS_ERR(st->reg)) {
786 ret = regulator_enable(st->reg);
787 if (ret)
788 goto error_put_reg;
789 }
790 st->client = client;
791
792 st->indio_dev = iio_allocate_device();
793 if (st->indio_dev == NULL) {
794 ret = -ENOMEM;
795 goto error_disable_reg;
796 }
797
798 /* Estabilish that the iio_dev is a child of the i2c device */
799 st->indio_dev->dev.parent = &client->dev;
800 st->indio_dev->attrs = st->chip_info->dev_attrs;
801 st->indio_dev->event_attrs = st->chip_info->event_attrs;
802
803 st->indio_dev->dev_data = (void *)(st);
804 st->indio_dev->driver_module = THIS_MODULE;
805 st->indio_dev->modes = INDIO_DIRECT_MODE;
806 st->indio_dev->num_interrupt_lines = 1;
807
808 ret = ad799x_set_scan_mode(st, 0);
809 if (ret)
810 goto error_free_device;
811
812 ret = ad799x_register_ring_funcs_and_init(st->indio_dev);
813 if (ret)
814 goto error_free_device;
815
816 ret = iio_device_register(st->indio_dev);
817 if (ret)
818 goto error_cleanup_ring;
819 regdone = 1;
820
821 ret = iio_ring_buffer_register(st->indio_dev->ring, 0);
822 if (ret)
823 goto error_cleanup_ring;
824
825 if (client->irq > 0 && st->chip_info->monitor_mode) {
826 INIT_WORK(&st->work_thresh, ad799x_interrupt_bh);
827
828 ret = iio_register_interrupt_line(client->irq,
829 st->indio_dev,
830 0,
831 IRQF_TRIGGER_FALLING,
832 client->name);
833 if (ret)
834 goto error_cleanup_ring;
835
836 /*
837 * The event handler list element refer to iio_event_ad799x.
838 * All event attributes bind to the same event handler.
839 * So, only register event handler once.
840 */
841 iio_add_event_to_list(&iio_event_ad799x,
842 &st->indio_dev->interrupts[0]->ev_list);
843 }
844
845 return 0;
846 error_cleanup_ring:
847 ad799x_ring_cleanup(st->indio_dev);
848 error_free_device:
849 if (!regdone)
850 iio_free_device(st->indio_dev);
851 else
852 iio_device_unregister(st->indio_dev);
853 error_disable_reg:
854 if (!IS_ERR(st->reg))
855 regulator_disable(st->reg);
856 error_put_reg:
857 if (!IS_ERR(st->reg))
858 regulator_put(st->reg);
859 kfree(st);
860 error_ret:
861 return ret;
862 }
863
864 static __devexit int ad799x_remove(struct i2c_client *client)
865 {
866 struct ad799x_state *st = i2c_get_clientdata(client);
867 struct iio_dev *indio_dev = st->indio_dev;
868
869 if (client->irq > 0 && st->chip_info->monitor_mode)
870 iio_unregister_interrupt_line(indio_dev, 0);
871
872 iio_ring_buffer_unregister(indio_dev->ring);
873 ad799x_ring_cleanup(indio_dev);
874 iio_device_unregister(indio_dev);
875 if (!IS_ERR(st->reg)) {
876 regulator_disable(st->reg);
877 regulator_put(st->reg);
878 }
879 kfree(st);
880
881 return 0;
882 }
883
884 static const struct i2c_device_id ad799x_id[] = {
885 { "ad7991", ad7991 },
886 { "ad7995", ad7995 },
887 { "ad7999", ad7999 },
888 { "ad7992", ad7992 },
889 { "ad7993", ad7993 },
890 { "ad7994", ad7994 },
891 { "ad7997", ad7997 },
892 { "ad7998", ad7998 },
893 {}
894 };
895
896 MODULE_DEVICE_TABLE(i2c, ad799x_id);
897
898 static struct i2c_driver ad799x_driver = {
899 .driver = {
900 .name = "ad799x",
901 },
902 .probe = ad799x_probe,
903 .remove = __devexit_p(ad799x_remove),
904 .id_table = ad799x_id,
905 };
906
907 static __init int ad799x_init(void)
908 {
909 return i2c_add_driver(&ad799x_driver);
910 }
911
912 static __exit void ad799x_exit(void)
913 {
914 i2c_del_driver(&ad799x_driver);
915 }
916
917 MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>");
918 MODULE_DESCRIPTION("Analog Devices AD799x ADC");
919 MODULE_LICENSE("GPL v2");
920 MODULE_ALIAS("i2c:ad799x");
921
922 module_init(ad799x_init);
923 module_exit(ad799x_exit);
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