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staging:iio: use the new central name attribute creation code
[GitHub/mt8127/android_kernel_alcatel_ttab.git] / drivers / staging / iio / adc / ad7291.c
CommitLineData
ddaecd5b
SZ		 1/*
2 * AD7291 digital temperature sensor driver supporting AD7291
3 *
4 * Copyright 2010 Analog Devices Inc.
5 *
6 * Licensed under the GPL-2 or later.
7 */
8
9#include <linux/interrupt.h>
10#include <linux/gpio.h>
ddaecd5b
SZ		 11#include <linux/device.h>
12#include <linux/kernel.h>
13#include <linux/slab.h>
14#include <linux/sysfs.h>
15#include <linux/list.h>
16#include <linux/i2c.h>
ddaecd5b
SZ		 17
18#include "../iio.h"
19#include "../sysfs.h"
20
21/*
22 * AD7291 registers definition
23 */
24#define AD7291_COMMAND 0
25#define AD7291_VOLTAGE 1
26#define AD7291_T_SENSE 2
27#define AD7291_T_AVERAGE 3
28#define AD7291_VOLTAGE_LIMIT_BASE 4
29#define AD7291_VOLTAGE_LIMIT_COUNT 8
30#define AD7291_T_SENSE_HIGH 0x1c
31#define AD7291_T_SENSE_LOW 0x1d
32#define AD7291_T_SENSE_HYST 0x1e
33#define AD7291_VOLTAGE_ALERT_STATUS 0x1f
34#define AD7291_T_ALERT_STATUS 0x20
35
36/*
37 * AD7291 command
38 */
39#define AD7291_AUTOCYCLE 0x1
40#define AD7291_RESET 0x2
41#define AD7291_ALART_CLEAR 0x4
42#define AD7291_ALART_POLARITY 0x8
43#define AD7291_EXT_REF 0x10
44#define AD7291_NOISE_DELAY 0x20
45#define AD7291_T_SENSE_MASK 0x40
46#define AD7291_VOLTAGE_MASK 0xff00
47#define AD7291_VOLTAGE_OFFSET 0x8
48
49/*
50 * AD7291 value masks
51 */
52#define AD7291_CHANNEL_MASK 0xf000
53#define AD7291_VALUE_MASK 0xfff
54#define AD7291_T_VALUE_SIGN 0x400
55#define AD7291_T_VALUE_FLOAT_OFFSET 2
56#define AD7291_T_VALUE_FLOAT_MASK 0x2
57
58/*
59 * struct ad7291_chip_info - chip specifc information
60 */
61
62struct ad7291_chip_info {
ddaecd5b
SZ		 63 struct i2c_client *client;
64 struct iio_dev *indio_dev;
ddaecd5b
SZ		 65 u16 command;
66 u8 channels; /* Active voltage channels */
67};
68
69/*
70 * struct ad7291_chip_info - chip specifc information
71 */
72
73struct ad7291_limit_regs {
74 u16 data_high;
75 u16 data_low;
76 u16 hysteresis;
77};
78
79/*
80 * ad7291 register access by I2C
81 */
82static int ad7291_i2c_read(struct ad7291_chip_info *chip, u8 reg, u16 *data)
83{
84 struct i2c_client *client = chip->client;
85 int ret = 0;
86
87 ret = i2c_smbus_read_word_data(client, reg);
88 if (ret < 0) {
89 dev_err(&client->dev, "I2C read error\n");
90 return ret;
91 }
92
93 *data = swab16((u16)ret);
94
95 return 0;
96}
97
98static int ad7291_i2c_write(struct ad7291_chip_info *chip, u8 reg, u16 data)
99{
100 struct i2c_client *client = chip->client;
101 int ret = 0;
102
103 ret = i2c_smbus_write_word_data(client, reg, swab16(data));
104 if (ret < 0)
105 dev_err(&client->dev, "I2C write error\n");
106
107 return ret;
108}
109
110/* Returns negative errno, or else the number of words read. */
111static int ad7291_i2c_read_data(struct ad7291_chip_info *chip, u8 reg, u16 *data)
112{
113 struct i2c_client *client = chip->client;
114 u8 commands[4];
115 int ret = 0;
116 int i, count;
117
118 if (reg == AD7291_T_SENSE || reg == AD7291_T_AVERAGE)
119 count = 2;
120 else if (reg == AD7291_VOLTAGE) {
121 if (!chip->channels) {
122 dev_err(&client->dev, "No voltage channel is selected.\n");
123 return -EINVAL;
124 }
125 count = 2 + chip->channels * 2;
126 } else {
127 dev_err(&client->dev, "I2C wrong data register\n");
128 return -EINVAL;
129 }
130
131 commands[0] = 0;
132 commands[1] = (chip->command >> 8) & 0xff;
133 commands[2] = chip->command & 0xff;
134 commands[3] = reg;
135
136 ret = i2c_master_send(client, commands, 4);
137 if (ret < 0) {
138 dev_err(&client->dev, "I2C master send error\n");
139 return ret;
140 }
141
142 ret = i2c_master_recv(client, (u8 *)data, count);
143 if (ret < 0) {
144 dev_err(&client->dev, "I2C master receive error\n");
145 return ret;
146 }
147 ret >>= 2;
148
149 for (i = 0; i < ret; i++)
150 data[i] = swab16(data[i]);
151
152 return ret;
153}
154
155static ssize_t ad7291_show_mode(struct device *dev,
156 struct device_attribute *attr,
157 char *buf)
158{
159 struct iio_dev *dev_info = dev_get_drvdata(dev);
160 struct ad7291_chip_info *chip = dev_info->dev_data;
161
162 if (chip->command & AD7291_AUTOCYCLE)
163 return sprintf(buf, "autocycle\n");
164 else
165 return sprintf(buf, "command\n");
166}
167
168static ssize_t ad7291_store_mode(struct device *dev,
169 struct device_attribute *attr,
170 const char *buf,
171 size_t len)
172{
173 struct iio_dev *dev_info = dev_get_drvdata(dev);
174 struct ad7291_chip_info *chip = dev_info->dev_data;
175 u16 command;
176 int ret;
177
178 command = chip->command & (~AD7291_AUTOCYCLE);
179 if (strcmp(buf, "autocycle"))
180 command |= AD7291_AUTOCYCLE;
181
182 ret = ad7291_i2c_write(chip, AD7291_COMMAND, command);
183 if (ret)
184 return -EIO;
185
186 chip->command = command;
187
188 return ret;
189}
190
191static IIO_DEVICE_ATTR(mode, S_IRUGO | S_IWUSR,
192 ad7291_show_mode,
193 ad7291_store_mode,
194 0);
195
196static ssize_t ad7291_show_available_modes(struct device *dev,
197 struct device_attribute *attr,
198 char *buf)
199{
200 return sprintf(buf, "command\nautocycle\n");
201}
202
203static IIO_DEVICE_ATTR(available_modes, S_IRUGO, ad7291_show_available_modes, NULL, 0);
204
205static ssize_t ad7291_store_reset(struct device *dev,
206 struct device_attribute *attr,
207 const char *buf,
208 size_t len)
209{
210 struct iio_dev *dev_info = dev_get_drvdata(dev);
211 struct ad7291_chip_info *chip = dev_info->dev_data;
212 u16 command;
213 int ret;
214
215 command = chip->command | AD7291_RESET;
216
217 ret = ad7291_i2c_write(chip, AD7291_COMMAND, command);
218 if (ret)
219 return -EIO;
220
221 return ret;
222}
223
224static IIO_DEVICE_ATTR(reset, S_IWUSR,
225 NULL,
226 ad7291_store_reset,
227 0);
228
229static ssize_t ad7291_show_ext_ref(struct device *dev,
230 struct device_attribute *attr,
231 char *buf)
232{
233 struct iio_dev *dev_info = dev_get_drvdata(dev);
234 struct ad7291_chip_info *chip = dev_info->dev_data;
235
236 return sprintf(buf, "%d\n", !!(chip->command & AD7291_EXT_REF));
237}
238
239static ssize_t ad7291_store_ext_ref(struct device *dev,
240 struct device_attribute *attr,
241 const char *buf,
242 size_t len)
243{
244 struct iio_dev *dev_info = dev_get_drvdata(dev);
245 struct ad7291_chip_info *chip = dev_info->dev_data;
246 u16 command;
247 int ret;
248
249 command = chip->command & (~AD7291_EXT_REF);
250 if (strcmp(buf, "1"))
251 command |= AD7291_EXT_REF;
252
253 ret = ad7291_i2c_write(chip, AD7291_COMMAND, command);
254 if (ret)
255 return -EIO;
256
257 chip->command = command;
258
259 return ret;
260}
261
262static IIO_DEVICE_ATTR(ext_ref, S_IRUGO | S_IWUSR,
263 ad7291_show_ext_ref,
264 ad7291_store_ext_ref,
265 0);
266
267static ssize_t ad7291_show_noise_delay(struct device *dev,
268 struct device_attribute *attr,
269 char *buf)
270{
271 struct iio_dev *dev_info = dev_get_drvdata(dev);
272 struct ad7291_chip_info *chip = dev_info->dev_data;
273
274 return sprintf(buf, "%d\n", !!(chip->command & AD7291_NOISE_DELAY));
275}
276
277static ssize_t ad7291_store_noise_delay(struct device *dev,
278 struct device_attribute *attr,
279 const char *buf,
280 size_t len)
281{
282 struct iio_dev *dev_info = dev_get_drvdata(dev);
283 struct ad7291_chip_info *chip = dev_info->dev_data;
284 u16 command;
285 int ret;
286
287 command = chip->command & (~AD7291_NOISE_DELAY);
288 if (strcmp(buf, "1"))
289 command |= AD7291_NOISE_DELAY;
290
291 ret = ad7291_i2c_write(chip, AD7291_COMMAND, command);
292 if (ret)
293 return -EIO;
294
295 chip->command = command;
296
297 return ret;
298}
299
300static IIO_DEVICE_ATTR(noise_delay, S_IRUGO | S_IWUSR,
301 ad7291_show_noise_delay,
302 ad7291_store_noise_delay,
303 0);
304
305static ssize_t ad7291_show_t_sense(struct device *dev,
306 struct device_attribute *attr,
307 char *buf)
308{
309 struct iio_dev *dev_info = dev_get_drvdata(dev);
310 struct ad7291_chip_info *chip = dev_info->dev_data;
311 u16 data;
312 char sign = ' ';
313 int ret;
314
315 ret = ad7291_i2c_read_data(chip, AD7291_T_SENSE, &data);
316 if (ret)
317 return -EIO;
318
319 if (data & AD7291_T_VALUE_SIGN) {
320 /* convert supplement to positive value */
321 data = (AD7291_T_VALUE_SIGN << 1) - data;
322 sign = '-';
323 }
324
325 return sprintf(buf, "%c%d.%.2d\n", sign,
326 (data >> AD7291_T_VALUE_FLOAT_OFFSET),
327 (data & AD7291_T_VALUE_FLOAT_MASK) * 25);
328}
329
330static IIO_DEVICE_ATTR(t_sense, S_IRUGO, ad7291_show_t_sense, NULL, 0);
331
332static ssize_t ad7291_show_t_average(struct device *dev,
333 struct device_attribute *attr,
334 char *buf)
335{
336 struct iio_dev *dev_info = dev_get_drvdata(dev);
337 struct ad7291_chip_info *chip = dev_info->dev_data;
338 u16 data;
339 char sign = ' ';
340 int ret;
341
342 ret = ad7291_i2c_read_data(chip, AD7291_T_AVERAGE, &data);
343 if (ret)
344 return -EIO;
345
346 if (data & AD7291_T_VALUE_SIGN) {
347 /* convert supplement to positive value */
348 data = (AD7291_T_VALUE_SIGN << 1) - data;
349 sign = '-';
350 }
351
352 return sprintf(buf, "%c%d.%.2d\n", sign,
353 (data >> AD7291_T_VALUE_FLOAT_OFFSET),
354 (data & AD7291_T_VALUE_FLOAT_MASK) * 25);
355}
356
357static IIO_DEVICE_ATTR(t_average, S_IRUGO, ad7291_show_t_average, NULL, 0);
358
359static ssize_t ad7291_show_voltage(struct device *dev,
360 struct device_attribute *attr,
361 char *buf)
362{
363 struct iio_dev *dev_info = dev_get_drvdata(dev);
364 struct ad7291_chip_info *chip = dev_info->dev_data;
365 u16 data[AD7291_VOLTAGE_LIMIT_COUNT];
366 int i, size, ret;
367
368 ret = ad7291_i2c_read_data(chip, AD7291_VOLTAGE, data);
369 if (ret)
370 return -EIO;
371
372 for (i = 0; i < AD7291_VOLTAGE_LIMIT_COUNT; i++) {
373 if (chip->command & (AD7291_T_SENSE_MASK << i)) {
374 ret = sprintf(buf, "channel[%d]=%d\n", i,
375 data[i] & AD7291_VALUE_MASK);
376 if (ret < 0)
377 break;
378 buf += ret;
379 size += ret;
380 }
381 }
382
383 return size;
384}
385
386static IIO_DEVICE_ATTR(voltage, S_IRUGO, ad7291_show_voltage, NULL, 0);
387
388static ssize_t ad7291_show_channel_mask(struct device *dev,
389 struct device_attribute *attr,
390 char *buf)
391{
392 struct iio_dev *dev_info = dev_get_drvdata(dev);
393 struct ad7291_chip_info *chip = dev_info->dev_data;
394
395 return sprintf(buf, "0x%x\n", (chip->command & AD7291_VOLTAGE_MASK) >>
396 AD7291_VOLTAGE_OFFSET);
397}
398
399static ssize_t ad7291_store_channel_mask(struct device *dev,
400 struct device_attribute *attr,
401 const char *buf,
402 size_t len)
403{
404 struct iio_dev *dev_info = dev_get_drvdata(dev);
405 struct ad7291_chip_info *chip = dev_info->dev_data;
406 u16 command;
407 unsigned long data;
408 int i, ret;
409
410 ret = strict_strtoul(buf, 16, &data);
411 if (ret || data > 0xff)
412 return -EINVAL;
413
414 command = chip->command & (~AD7291_VOLTAGE_MASK);
415 command |= data << AD7291_VOLTAGE_OFFSET;
416
417 ret = ad7291_i2c_write(chip, AD7291_COMMAND, command);
418 if (ret)
419 return -EIO;
420
421 chip->command = command;
422
423 for (i = 0, chip->channels = 0; i < AD7291_VOLTAGE_LIMIT_COUNT; i++) {
424 if (chip->command & (AD7291_T_SENSE_MASK << i))
425 chip->channels++;
426 }
427
428 return ret;
429}
430
431static IIO_DEVICE_ATTR(channel_mask, S_IRUGO | S_IWUSR,
432 ad7291_show_channel_mask,
433 ad7291_store_channel_mask,
434 0);
435
ddaecd5b
SZ		 436static struct attribute *ad7291_attributes[] = {
437 &iio_dev_attr_available_modes.dev_attr.attr,
438 &iio_dev_attr_mode.dev_attr.attr,
439 &iio_dev_attr_reset.dev_attr.attr,
440 &iio_dev_attr_ext_ref.dev_attr.attr,
441 &iio_dev_attr_noise_delay.dev_attr.attr,
442 &iio_dev_attr_t_sense.dev_attr.attr,
443 &iio_dev_attr_t_average.dev_attr.attr,
444 &iio_dev_attr_voltage.dev_attr.attr,
445 &iio_dev_attr_channel_mask.dev_attr.attr,
ddaecd5b
SZ		 446 NULL,
447};
448
449static const struct attribute_group ad7291_attribute_group = {
450 .attrs = ad7291_attributes,
451};
452
453/*
454 * temperature bound events
455 */
456
457#define IIO_EVENT_CODE_AD7291_T_SENSE_HIGH IIO_BUFFER_EVENT_CODE(0)
458#define IIO_EVENT_CODE_AD7291_T_SENSE_LOW IIO_BUFFER_EVENT_CODE(1)
459#define IIO_EVENT_CODE_AD7291_T_AVG_HIGH IIO_BUFFER_EVENT_CODE(2)
460#define IIO_EVENT_CODE_AD7291_T_AVG_LOW IIO_BUFFER_EVENT_CODE(3)
461#define IIO_EVENT_CODE_AD7291_VOLTAGE_BASE IIO_BUFFER_EVENT_CODE(4)
462
58c0323c 463static irqreturn_t ad7291_event_handler(int irq, void *private)
ddaecd5b 464{
58c0323c
JC		 465 struct iio_dev *indio_dev = private;
466 struct ad7291_chip_info *chip = iio_dev_get_devdata(private);
ddaecd5b
SZ		 467 u16 t_status, v_status;
468 u16 command;
469 int i;
58c0323c 470 s64 timestamp = iio_get_time_ns();
ddaecd5b
SZ		 471
472 if (ad7291_i2c_read(chip, AD7291_T_ALERT_STATUS, &t_status))
58c0323c 473 return IRQ_HANDLED;
ddaecd5b
SZ		 474
475 if (ad7291_i2c_read(chip, AD7291_VOLTAGE_ALERT_STATUS, &v_status))
58c0323c 476 return IRQ_HANDLED;
ddaecd5b
SZ		 477
478 if (!(t_status || v_status))
58c0323c 479 return IRQ_HANDLED;
ddaecd5b
SZ		 480
481 command = chip->command | AD7291_ALART_CLEAR;
482 ad7291_i2c_write(chip, AD7291_COMMAND, command);
483
484 command = chip->command & ~AD7291_ALART_CLEAR;
485 ad7291_i2c_write(chip, AD7291_COMMAND, command);
486
ddaecd5b
SZ		 487 for (i = 0; i < 4; i++) {
488 if (t_status & (1 << i))
58c0323c 489 iio_push_event(indio_dev, 0,
ddaecd5b 490 IIO_EVENT_CODE_AD7291_T_SENSE_HIGH + i,
58c0323c 491 timestamp);
ddaecd5b
SZ		 492 }
493
494 for (i = 0; i < AD7291_VOLTAGE_LIMIT_COUNT*2; i++) {
495 if (v_status & (1 << i))
58c0323c 496 iio_push_event(indio_dev, 0,
ddaecd5b 497 IIO_EVENT_CODE_AD7291_VOLTAGE_BASE + i,
58c0323c 498 timestamp);
ddaecd5b 499 }
ddaecd5b 500
58c0323c 501 return IRQ_HANDLED;
ddaecd5b
SZ		 502}
503
ddaecd5b
SZ		 504static inline ssize_t ad7291_show_t_bound(struct device *dev,
505 struct device_attribute *attr,
ddaecd5b
SZ		 506 char *buf)
507{
508 struct iio_dev *dev_info = dev_get_drvdata(dev);
509 struct ad7291_chip_info *chip = dev_info->dev_data;
58c0323c 510 struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
ddaecd5b
SZ		 511 u16 data;
512 char sign = ' ';
513 int ret;
514
58c0323c 515 ret = ad7291_i2c_read(chip, this_attr->address, &data);
ddaecd5b
SZ		 516 if (ret)
517 return -EIO;
518
519 data &= AD7291_VALUE_MASK;
520 if (data & AD7291_T_VALUE_SIGN) {
521 /* convert supplement to positive value */
522 data = (AD7291_T_VALUE_SIGN << 1) - data;
523 sign = '-';
524 }
525
526 return sprintf(buf, "%c%d.%.2d\n", sign,
527 data >> AD7291_T_VALUE_FLOAT_OFFSET,
528 (data & AD7291_T_VALUE_FLOAT_MASK) * 25);
529}
530
531static inline ssize_t ad7291_set_t_bound(struct device *dev,
532 struct device_attribute *attr,
ddaecd5b
SZ		 533 const char *buf,
534 size_t len)
535{
536 struct iio_dev *dev_info = dev_get_drvdata(dev);
537 struct ad7291_chip_info *chip = dev_info->dev_data;
58c0323c 538 struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
ddaecd5b
SZ		 539 long tmp1, tmp2;
540 u16 data;
541 char *pos;
542 int ret;
543
544 pos = strchr(buf, '.');
545
546 ret = strict_strtol(buf, 10, &tmp1);
547
548 if (ret || tmp1 > 127 || tmp1 < -128)
549 return -EINVAL;
550
551 if (pos) {
552 len = strlen(pos);
553 if (len > AD7291_T_VALUE_FLOAT_OFFSET)
554 len = AD7291_T_VALUE_FLOAT_OFFSET;
555 pos[len] = 0;
556 ret = strict_strtol(pos, 10, &tmp2);
557
558 if (!ret)
559 tmp2 = (tmp2 / 25) * 25;
560 }
561
562 if (tmp1 < 0)
563 data = (u16)(-tmp1);
564 else
565 data = (u16)tmp1;
566 data = (data << AD7291_T_VALUE_FLOAT_OFFSET) |
567 (tmp2 & AD7291_T_VALUE_FLOAT_MASK);
568 if (tmp1 < 0)
569 /* convert positive value to supplyment */
570 data = (AD7291_T_VALUE_SIGN << 1) - data;
571
58c0323c 572 ret = ad7291_i2c_write(chip, this_attr->address, data);
ddaecd5b
SZ		 573 if (ret)
574 return -EIO;
575
576 return ret;
577}
578
ddaecd5b
SZ		 579static inline ssize_t ad7291_show_v_bound(struct device *dev,
580 struct device_attribute *attr,
581 u8 bound_reg,
582 char *buf)
583{
584 struct iio_dev *dev_info = dev_get_drvdata(dev);
585 struct ad7291_chip_info *chip = dev_info->dev_data;
586 u16 data;
587 int ret;
588
589 if (bound_reg < AD7291_VOLTAGE_LIMIT_BASE ||
590 bound_reg >= AD7291_VOLTAGE_LIMIT_BASE +
591 AD7291_VOLTAGE_LIMIT_COUNT)
592 return -EINVAL;
593
594 ret = ad7291_i2c_read(chip, bound_reg, &data);
595 if (ret)
596 return -EIO;
597
598 data &= AD7291_VALUE_MASK;
599
600 return sprintf(buf, "%d\n", data);
601}
602
603static inline ssize_t ad7291_set_v_bound(struct device *dev,
604 struct device_attribute *attr,
605 u8 bound_reg,
606 const char *buf,
607 size_t len)
608{
609 struct iio_dev *dev_info = dev_get_drvdata(dev);
610 struct ad7291_chip_info *chip = dev_info->dev_data;
611 unsigned long value;
612 u16 data;
613 int ret;
614
615 if (bound_reg < AD7291_VOLTAGE_LIMIT_BASE ||
616 bound_reg >= AD7291_VOLTAGE_LIMIT_BASE +
617 AD7291_VOLTAGE_LIMIT_COUNT)
618 return -EINVAL;
619
620 ret = strict_strtoul(buf, 10, &value);
621
622 if (ret || value >= 4096)
623 return -EINVAL;
624
625 data = (u16)value;
626 ret = ad7291_i2c_write(chip, bound_reg, data);
627 if (ret)
628 return -EIO;
629
630 return ret;
631}
632
58c0323c
JC		 633static IIO_DEVICE_ATTR(t_sense_high_value,
634 S_IRUGO | S_IWUSR,
635 ad7291_show_t_bound, ad7291_set_t_bound,
636 AD7291_T_SENSE_HIGH);
637static IIO_DEVICE_ATTR(t_sense_low_value,
638 S_IRUGO | S_IWUSR,
639 ad7291_show_t_bound, ad7291_set_t_bound,
640 AD7291_T_SENSE_LOW);
641static IIO_DEVICE_ATTR(t_sense_hyst_value,
642 S_IRUGO | S_IWUSR,
643 ad7291_show_t_bound, ad7291_set_t_bound,
644 AD7291_T_SENSE_HYST);
645static IIO_DEVICE_ATTR(v0_high,
646 S_IRUGO | S_IWUSR,
647 ad7291_show_t_bound, ad7291_set_t_bound, 0x04);
648static IIO_DEVICE_ATTR(v0_low,
649 S_IRUGO | S_IWUSR,
650 ad7291_show_t_bound, ad7291_set_t_bound, 0x05);
651static IIO_DEVICE_ATTR(v0_hyst,
652 S_IRUGO | S_IWUSR,
653 ad7291_show_t_bound, ad7291_set_t_bound, 0x06);
654static IIO_DEVICE_ATTR(v1_high,
655 S_IRUGO | S_IWUSR,
656 ad7291_show_t_bound, ad7291_set_t_bound, 0x07);
657static IIO_DEVICE_ATTR(v1_low,
658 S_IRUGO | S_IWUSR,
659 ad7291_show_t_bound, ad7291_set_t_bound, 0x08);
660static IIO_DEVICE_ATTR(v1_hyst,
661 S_IRUGO | S_IWUSR,
662 ad7291_show_t_bound, ad7291_set_t_bound, 0x09);
663static IIO_DEVICE_ATTR(v2_high,
664 S_IRUGO | S_IWUSR,
665 ad7291_show_t_bound, ad7291_set_t_bound, 0x0A);
666static IIO_DEVICE_ATTR(v2_low,
667 S_IRUGO | S_IWUSR,
668 ad7291_show_t_bound, ad7291_set_t_bound, 0x0B);
669static IIO_DEVICE_ATTR(v2_hyst,
670 S_IRUGO | S_IWUSR,
671 ad7291_show_t_bound, ad7291_set_t_bound, 0x0C);
672static IIO_DEVICE_ATTR(v3_high,
673 S_IRUGO | S_IWUSR,
674 /* Datasheet suggests this one and this one only
675 has the registers in different order */
676 ad7291_show_t_bound, ad7291_set_t_bound, 0x0E);
677static IIO_DEVICE_ATTR(v3_low,
678 S_IRUGO | S_IWUSR,
679 ad7291_show_t_bound, ad7291_set_t_bound, 0x0D);
680static IIO_DEVICE_ATTR(v3_hyst,
681 S_IRUGO | S_IWUSR,
682 ad7291_show_t_bound, ad7291_set_t_bound, 0x0F);
683static IIO_DEVICE_ATTR(v4_high,
684 S_IRUGO | S_IWUSR,
685 ad7291_show_t_bound, ad7291_set_t_bound, 0x10);
686static IIO_DEVICE_ATTR(v4_low,
687 S_IRUGO | S_IWUSR,
688 ad7291_show_t_bound, ad7291_set_t_bound, 0x11);
689static IIO_DEVICE_ATTR(v4_hyst,
690 S_IRUGO | S_IWUSR,
691 ad7291_show_t_bound, ad7291_set_t_bound, 0x12);
692static IIO_DEVICE_ATTR(v5_high,
693 S_IRUGO | S_IWUSR,
694 ad7291_show_t_bound, ad7291_set_t_bound, 0x13);
695static IIO_DEVICE_ATTR(v5_low,
696 S_IRUGO | S_IWUSR,
697 ad7291_show_t_bound, ad7291_set_t_bound, 0x14);
698static IIO_DEVICE_ATTR(v5_hyst,
699 S_IRUGO | S_IWUSR,
700 ad7291_show_t_bound, ad7291_set_t_bound, 0x15);
701static IIO_DEVICE_ATTR(v6_high,
702 S_IRUGO | S_IWUSR,
703 ad7291_show_t_bound, ad7291_set_t_bound, 0x16);
704static IIO_DEVICE_ATTR(v6_low,
705 S_IRUGO | S_IWUSR,
706 ad7291_show_t_bound, ad7291_set_t_bound, 0x17);
707static IIO_DEVICE_ATTR(v6_hyst,
708 S_IRUGO | S_IWUSR,
709 ad7291_show_t_bound, ad7291_set_t_bound, 0x18);
710static IIO_DEVICE_ATTR(v7_high,
711 S_IRUGO | S_IWUSR,
712 ad7291_show_t_bound, ad7291_set_t_bound, 0x19);
713static IIO_DEVICE_ATTR(v7_low,
714 S_IRUGO | S_IWUSR,
715 ad7291_show_t_bound, ad7291_set_t_bound, 0x1A);
716static IIO_DEVICE_ATTR(v7_hyst,
717 S_IRUGO | S_IWUSR,
718 ad7291_show_t_bound, ad7291_set_t_bound, 0x1B);
ddaecd5b
SZ		 719
720static struct attribute *ad7291_event_attributes[] = {
58c0323c
JC		 721 &iio_dev_attr_t_sense_high_value.dev_attr.attr,
722 &iio_dev_attr_t_sense_low_value.dev_attr.attr,
723 &iio_dev_attr_t_sense_hyst_value.dev_attr.attr,
724 &iio_dev_attr_v0_high.dev_attr.attr,
725 &iio_dev_attr_v0_low.dev_attr.attr,
726 &iio_dev_attr_v0_hyst.dev_attr.attr,
727 &iio_dev_attr_v1_high.dev_attr.attr,
728 &iio_dev_attr_v1_low.dev_attr.attr,
729 &iio_dev_attr_v1_hyst.dev_attr.attr,
730 &iio_dev_attr_v2_high.dev_attr.attr,
731 &iio_dev_attr_v2_low.dev_attr.attr,
732 &iio_dev_attr_v2_hyst.dev_attr.attr,
733 &iio_dev_attr_v3_high.dev_attr.attr,
734 &iio_dev_attr_v3_low.dev_attr.attr,
735 &iio_dev_attr_v3_hyst.dev_attr.attr,
736 &iio_dev_attr_v4_high.dev_attr.attr,
737 &iio_dev_attr_v4_low.dev_attr.attr,
738 &iio_dev_attr_v4_hyst.dev_attr.attr,
739 &iio_dev_attr_v5_high.dev_attr.attr,
740 &iio_dev_attr_v5_low.dev_attr.attr,
741 &iio_dev_attr_v5_hyst.dev_attr.attr,
742 &iio_dev_attr_v6_high.dev_attr.attr,
743 &iio_dev_attr_v6_low.dev_attr.attr,
744 &iio_dev_attr_v6_hyst.dev_attr.attr,
745 &iio_dev_attr_v7_high.dev_attr.attr,
746 &iio_dev_attr_v7_low.dev_attr.attr,
747 &iio_dev_attr_v7_hyst.dev_attr.attr,
ddaecd5b
SZ		 748 NULL,
749};
750
751static struct attribute_group ad7291_event_attribute_group = {
752 .attrs = ad7291_event_attributes,
753};
754
755/*
756 * device probe and remove
757 */
758
759static int __devinit ad7291_probe(struct i2c_client *client,
760 const struct i2c_device_id *id)
761{
762 struct ad7291_chip_info *chip;
763 int ret = 0;
764
765 chip = kzalloc(sizeof(struct ad7291_chip_info), GFP_KERNEL);
766
767 if (chip == NULL)
768 return -ENOMEM;
769
770 /* this is only used for device removal purposes */
771 i2c_set_clientdata(client, chip);
772
773 chip->client = client;
ddaecd5b
SZ		 774 chip->command = AD7291_NOISE_DELAY | AD7291_T_SENSE_MASK;
775
6f7c8ee5 776 chip->indio_dev = iio_allocate_device(0);
ddaecd5b
SZ		 777 if (chip->indio_dev == NULL) {
778 ret = -ENOMEM;
779 goto error_free_chip;
780 }
781
845bd12a 782 chip->indio_dev->name = id->name;
ddaecd5b
SZ		 783 chip->indio_dev->dev.parent = &client->dev;
784 chip->indio_dev->attrs = &ad7291_attribute_group;
785 chip->indio_dev->event_attrs = &ad7291_event_attribute_group;
786 chip->indio_dev->dev_data = (void *)chip;
787 chip->indio_dev->driver_module = THIS_MODULE;
788 chip->indio_dev->num_interrupt_lines = 1;
789 chip->indio_dev->modes = INDIO_DIRECT_MODE;
790
791 ret = iio_device_register(chip->indio_dev);
792 if (ret)
793 goto error_free_dev;
794
795 if (client->irq > 0) {
58c0323c
JC		 796 ret = request_threaded_irq(client->irq,
797 NULL,
798 &ad7291_event_handler,
799 IRQF_TRIGGER_LOW | IRQF_ONESHOT,
845bd12a 800 id->name,
58c0323c 801 chip->indio_dev);
ddaecd5b
SZ		 802 if (ret)
803 goto error_unreg_dev;
804
ddaecd5b
SZ		 805 /* set irq polarity low level */
806 chip->command |= AD7291_ALART_POLARITY;
807 }
808
809 ret = ad7291_i2c_write(chip, AD7291_COMMAND, chip->command);
810 if (ret) {
811 ret = -EIO;
812 goto error_unreg_irq;
813 }
814
815 dev_info(&client->dev, "%s temperature sensor registered.\n",
816 id->name);
817
818 return 0;
819
820error_unreg_irq:
58c0323c 821 free_irq(client->irq, chip->indio_dev);
ddaecd5b
SZ		 822error_unreg_dev:
823 iio_device_unregister(chip->indio_dev);
824error_free_dev:
825 iio_free_device(chip->indio_dev);
826error_free_chip:
827 kfree(chip);
828
829 return ret;
830}
831
832static int __devexit ad7291_remove(struct i2c_client *client)
833{
834 struct ad7291_chip_info *chip = i2c_get_clientdata(client);
835 struct iio_dev *indio_dev = chip->indio_dev;
836
837 if (client->irq)
58c0323c 838 free_irq(client->irq, chip->indio_dev);
ddaecd5b
SZ		 839 iio_device_unregister(indio_dev);
840 iio_free_device(chip->indio_dev);
841 kfree(chip);
842
843 return 0;
844}
845
846static const struct i2c_device_id ad7291_id[] = {
847 { "ad7291", 0 },
848 {}
849};
850
851MODULE_DEVICE_TABLE(i2c, ad7291_id);
852
853static struct i2c_driver ad7291_driver = {
854 .driver = {
855 .name = "ad7291",
856 },
857 .probe = ad7291_probe,
858 .remove = __devexit_p(ad7291_remove),
859 .id_table = ad7291_id,
860};
861
862static __init int ad7291_init(void)
863{
864 return i2c_add_driver(&ad7291_driver);
865}
866
867static __exit void ad7291_exit(void)
868{
869 i2c_del_driver(&ad7291_driver);
870}
871
872MODULE_AUTHOR("Sonic Zhang <sonic.zhang@analog.com>");
873MODULE_DESCRIPTION("Analog Devices AD7291 digital"
874 " temperature sensor driver");
875MODULE_LICENSE("GPL v2");
876
877module_init(ad7291_init);
878module_exit(ad7291_exit);
kernel source for telekom puls (alcatel/mediatek)