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1/*
2 * ADT7410 digital temperature sensor driver supporting ADT7410
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/device.h>
11#include <linux/kernel.h>
12#include <linux/slab.h>
13#include <linux/sysfs.h>
14#include <linux/list.h>
15#include <linux/i2c.h>
16#include <linux/module.h>
17
18#include <linux/iio/iio.h>
19#include <linux/iio/sysfs.h>
20#include <linux/iio/events.h>
21
22/*
23 * ADT7410 registers definition
24 */
25
26#define ADT7410_TEMPERATURE 0
27#define ADT7410_STATUS 2
28#define ADT7410_CONFIG 3
29#define ADT7410_T_ALARM_HIGH 4
30#define ADT7410_T_ALARM_LOW 6
31#define ADT7410_T_CRIT 8
32#define ADT7410_T_HYST 0xA
33#define ADT7410_ID 0xB
34#define ADT7410_RESET 0x2F
35
36/*
37 * ADT7410 status
38 */
39#define ADT7410_STAT_T_LOW 0x10
40#define ADT7410_STAT_T_HIGH 0x20
41#define ADT7410_STAT_T_CRIT 0x40
42#define ADT7410_STAT_NOT_RDY 0x80
43
44/*
45 * ADT7410 config
46 */
47#define ADT7410_FAULT_QUEUE_MASK 0x3
48#define ADT7410_CT_POLARITY 0x4
49#define ADT7410_INT_POLARITY 0x8
50#define ADT7410_EVENT_MODE 0x10
51#define ADT7410_MODE_MASK 0x60
52#define ADT7410_ONESHOT 0x20
53#define ADT7410_SPS 0x40
54#define ADT7410_PD 0x60
55#define ADT7410_RESOLUTION 0x80
56
57/*
58 * ADT7410 masks
59 */
60#define ADT7410_T16_VALUE_SIGN 0x8000
61#define ADT7410_T16_VALUE_FLOAT_OFFSET 7
62#define ADT7410_T16_VALUE_FLOAT_MASK 0x7F
63#define ADT7410_T13_VALUE_SIGN 0x1000
64#define ADT7410_T13_VALUE_OFFSET 3
65#define ADT7410_T13_VALUE_FLOAT_OFFSET 4
66#define ADT7410_T13_VALUE_FLOAT_MASK 0xF
67#define ADT7410_T_HYST_MASK 0xF
68#define ADT7410_DEVICE_ID_MASK 0xF
69#define ADT7410_MANUFACTORY_ID_MASK 0xF0
70#define ADT7410_MANUFACTORY_ID_OFFSET 4
71
72#define ADT7410_IRQS 2
73
74/*
75 * struct adt7410_chip_info - chip specifc information
76 */
77
78struct adt7410_chip_info {
79 struct i2c_client *client;
80 u8 config;
81};
82
83/*
84 * adt7410 register access by I2C
85 */
86
87static int adt7410_i2c_read_word(struct adt7410_chip_info *chip, u8 reg, u16 *data)
88{
89 struct i2c_client *client = chip->client;
90 int ret = 0;
91
92 ret = i2c_smbus_read_word_data(client, reg);
93 if (ret < 0) {
94 dev_err(&client->dev, "I2C read error\n");
95 return ret;
96 }
97
98 *data = swab16((u16)ret);
99
100 return 0;
101}
102
103static int adt7410_i2c_write_word(struct adt7410_chip_info *chip, u8 reg, u16 data)
104{
105 struct i2c_client *client = chip->client;
106 int ret = 0;
107
108 ret = i2c_smbus_write_word_data(client, reg, swab16(data));
109 if (ret < 0)
110 dev_err(&client->dev, "I2C write error\n");
111
112 return ret;
113}
114
115static int adt7410_i2c_read_byte(struct adt7410_chip_info *chip, u8 reg, u8 *data)
116{
117 struct i2c_client *client = chip->client;
118 int ret = 0;
119
120 ret = i2c_smbus_read_byte_data(client, reg);
121 if (ret < 0) {
122 dev_err(&client->dev, "I2C read error\n");
123 return ret;
124 }
125
126 *data = (u8)ret;
127
128 return 0;
129}
130
131static int adt7410_i2c_write_byte(struct adt7410_chip_info *chip, u8 reg, u8 data)
132{
133 struct i2c_client *client = chip->client;
134 int ret = 0;
135
136 ret = i2c_smbus_write_byte_data(client, reg, data);
137 if (ret < 0)
138 dev_err(&client->dev, "I2C write error\n");
139
140 return ret;
141}
142
143static ssize_t adt7410_show_mode(struct device *dev,
144 struct device_attribute *attr,
145 char *buf)
146{
147 struct iio_dev *dev_info = dev_to_iio_dev(dev);
148 struct adt7410_chip_info *chip = iio_priv(dev_info);
149 u8 config;
150
151 config = chip->config & ADT7410_MODE_MASK;
152
153 switch (config) {
154 case ADT7410_PD:
155 return sprintf(buf, "power-down\n");
156 case ADT7410_ONESHOT:
157 return sprintf(buf, "one-shot\n");
158 case ADT7410_SPS:
159 return sprintf(buf, "sps\n");
160 default:
161 return sprintf(buf, "full\n");
162 }
163}
164
165static ssize_t adt7410_store_mode(struct device *dev,
166 struct device_attribute *attr,
167 const char *buf,
168 size_t len)
169{
170 struct iio_dev *dev_info = dev_to_iio_dev(dev);
171 struct adt7410_chip_info *chip = iio_priv(dev_info);
172 u16 config;
173 int ret;
174
175 ret = adt7410_i2c_read_byte(chip, ADT7410_CONFIG, &chip->config);
176 if (ret)
177 return -EIO;
178
179 config = chip->config & (~ADT7410_MODE_MASK);
180 if (strcmp(buf, "power-down"))
181 config |= ADT7410_PD;
182 else if (strcmp(buf, "one-shot"))
183 config |= ADT7410_ONESHOT;
184 else if (strcmp(buf, "sps"))
185 config |= ADT7410_SPS;
186
187 ret = adt7410_i2c_write_byte(chip, ADT7410_CONFIG, config);
188 if (ret)
189 return -EIO;
190
191 chip->config = config;
192
193 return ret;
194}
195
196static IIO_DEVICE_ATTR(mode, S_IRUGO | S_IWUSR,
197 adt7410_show_mode,
198 adt7410_store_mode,
199 0);
200
201static ssize_t adt7410_show_available_modes(struct device *dev,
202 struct device_attribute *attr,
203 char *buf)
204{
205 return sprintf(buf, "full\none-shot\nsps\npower-down\n");
206}
207
208static IIO_DEVICE_ATTR(available_modes, S_IRUGO, adt7410_show_available_modes, NULL, 0);
209
210static ssize_t adt7410_show_resolution(struct device *dev,
211 struct device_attribute *attr,
212 char *buf)
213{
214 struct iio_dev *dev_info = dev_to_iio_dev(dev);
215 struct adt7410_chip_info *chip = iio_priv(dev_info);
216 int ret;
217 int bits;
218
219 ret = adt7410_i2c_read_byte(chip, ADT7410_CONFIG, &chip->config);
220 if (ret)
221 return -EIO;
222
223 if (chip->config & ADT7410_RESOLUTION)
224 bits = 16;
225 else
226 bits = 13;
227
228 return sprintf(buf, "%d bits\n", bits);
229}
230
231static ssize_t adt7410_store_resolution(struct device *dev,
232 struct device_attribute *attr,
233 const char *buf,
234 size_t len)
235{
236 struct iio_dev *dev_info = dev_to_iio_dev(dev);
237 struct adt7410_chip_info *chip = iio_priv(dev_info);
238 unsigned long data;
239 u16 config;
240 int ret;
241
242 ret = strict_strtoul(buf, 10, &data);
243 if (ret)
244 return -EINVAL;
245
246 ret = adt7410_i2c_read_byte(chip, ADT7410_CONFIG, &chip->config);
247 if (ret)
248 return -EIO;
249
250 config = chip->config & (~ADT7410_RESOLUTION);
251 if (data)
252 config |= ADT7410_RESOLUTION;
253
254 ret = adt7410_i2c_write_byte(chip, ADT7410_CONFIG, config);
255 if (ret)
256 return -EIO;
257
258 chip->config = config;
259
260 return ret;
261}
262
263static IIO_DEVICE_ATTR(resolution, S_IRUGO | S_IWUSR,
264 adt7410_show_resolution,
265 adt7410_store_resolution,
266 0);
267
268static ssize_t adt7410_show_id(struct device *dev,
269 struct device_attribute *attr,
270 char *buf)
271{
272 struct iio_dev *dev_info = dev_to_iio_dev(dev);
273 struct adt7410_chip_info *chip = iio_priv(dev_info);
274 u8 id;
275 int ret;
276
277 ret = adt7410_i2c_read_byte(chip, ADT7410_ID, &id);
278 if (ret)
279 return -EIO;
280
281 return sprintf(buf, "device id: 0x%x\nmanufactory id: 0x%x\n",
282 id & ADT7410_DEVICE_ID_MASK,
283 (id & ADT7410_MANUFACTORY_ID_MASK) >> ADT7410_MANUFACTORY_ID_OFFSET);
284}
285
286static IIO_DEVICE_ATTR(id, S_IRUGO | S_IWUSR,
287 adt7410_show_id,
288 NULL,
289 0);
290
291static ssize_t adt7410_convert_temperature(struct adt7410_chip_info *chip,
292 u16 data, char *buf)
293{
294 char sign = ' ';
295
296 if (chip->config & ADT7410_RESOLUTION) {
297 if (data & ADT7410_T16_VALUE_SIGN) {
298 /* convert supplement to positive value */
299 data = (u16)((ADT7410_T16_VALUE_SIGN << 1) - (u32)data);
300 sign = '-';
301 }
302 return sprintf(buf, "%c%d.%.7d\n", sign,
303 (data >> ADT7410_T16_VALUE_FLOAT_OFFSET),
304 (data & ADT7410_T16_VALUE_FLOAT_MASK) * 78125);
305 } else {
306 if (data & ADT7410_T13_VALUE_SIGN) {
307 /* convert supplement to positive value */
308 data >>= ADT7410_T13_VALUE_OFFSET;
309 data = (ADT7410_T13_VALUE_SIGN << 1) - data;
310 sign = '-';
311 }
312 return sprintf(buf, "%c%d.%.4d\n", sign,
313 (data >> ADT7410_T13_VALUE_FLOAT_OFFSET),
314 (data & ADT7410_T13_VALUE_FLOAT_MASK) * 625);
315 }
316}
317
318static ssize_t adt7410_show_value(struct device *dev,
319 struct device_attribute *attr,
320 char *buf)
321{
322 struct iio_dev *dev_info = dev_to_iio_dev(dev);
323 struct adt7410_chip_info *chip = iio_priv(dev_info);
324 u8 status;
325 u16 data;
326 int ret, i = 0;
327
328 do {
329 ret = adt7410_i2c_read_byte(chip, ADT7410_STATUS, &status);
330 if (ret)
331 return -EIO;
332 i++;
333 if (i == 10000)
334 return -EIO;
335 } while (status & ADT7410_STAT_NOT_RDY);
336
337 ret = adt7410_i2c_read_word(chip, ADT7410_TEMPERATURE, &data);
338 if (ret)
339 return -EIO;
340
341 return adt7410_convert_temperature(chip, data, buf);
342}
343
344static IIO_DEVICE_ATTR(value, S_IRUGO, adt7410_show_value, NULL, 0);
345
346static struct attribute *adt7410_attributes[] = {
347 &iio_dev_attr_available_modes.dev_attr.attr,
348 &iio_dev_attr_mode.dev_attr.attr,
349 &iio_dev_attr_resolution.dev_attr.attr,
350 &iio_dev_attr_id.dev_attr.attr,
351 &iio_dev_attr_value.dev_attr.attr,
352 NULL,
353};
354
355static const struct attribute_group adt7410_attribute_group = {
356 .attrs = adt7410_attributes,
357};
358
359static irqreturn_t adt7410_event_handler(int irq, void *private)
360{
361 struct iio_dev *indio_dev = private;
362 struct adt7410_chip_info *chip = iio_priv(indio_dev);
363 s64 timestamp = iio_get_time_ns();
364 u8 status;
365
366 if (adt7410_i2c_read_byte(chip, ADT7410_STATUS, &status))
367 return IRQ_HANDLED;
368
369 if (status & ADT7410_STAT_T_HIGH)
370 iio_push_event(indio_dev,
371 IIO_UNMOD_EVENT_CODE(IIO_TEMP, 0,
372 IIO_EV_TYPE_THRESH,
373 IIO_EV_DIR_RISING),
374 timestamp);
375 if (status & ADT7410_STAT_T_LOW)
376 iio_push_event(indio_dev,
377 IIO_UNMOD_EVENT_CODE(IIO_TEMP, 0,
378 IIO_EV_TYPE_THRESH,
379 IIO_EV_DIR_FALLING),
380 timestamp);
381 if (status & ADT7410_STAT_T_CRIT)
382 iio_push_event(indio_dev,
383 IIO_UNMOD_EVENT_CODE(IIO_TEMP, 0,
384 IIO_EV_TYPE_THRESH,
385 IIO_EV_DIR_RISING),
386 timestamp);
387
388 return IRQ_HANDLED;
389}
390
391static ssize_t adt7410_show_event_mode(struct device *dev,
392 struct device_attribute *attr,
393 char *buf)
394{
395 struct iio_dev *dev_info = dev_to_iio_dev(dev);
396 struct adt7410_chip_info *chip = iio_priv(dev_info);
397 int ret;
398
399 ret = adt7410_i2c_read_byte(chip, ADT7410_CONFIG, &chip->config);
400 if (ret)
401 return -EIO;
402
403 if (chip->config & ADT7410_EVENT_MODE)
404 return sprintf(buf, "interrupt\n");
405 else
406 return sprintf(buf, "comparator\n");
407}
408
409static ssize_t adt7410_set_event_mode(struct device *dev,
410 struct device_attribute *attr,
411 const char *buf,
412 size_t len)
413{
414 struct iio_dev *dev_info = dev_to_iio_dev(dev);
415 struct adt7410_chip_info *chip = iio_priv(dev_info);
416 u16 config;
417 int ret;
418
419 ret = adt7410_i2c_read_byte(chip, ADT7410_CONFIG, &chip->config);
420 if (ret)
421 return -EIO;
422
423 config = chip->config &= ~ADT7410_EVENT_MODE;
424 if (strcmp(buf, "comparator") != 0)
425 config |= ADT7410_EVENT_MODE;
426
427 ret = adt7410_i2c_write_byte(chip, ADT7410_CONFIG, config);
428 if (ret)
429 return -EIO;
430
431 chip->config = config;
432
433 return ret;
434}
435
436static ssize_t adt7410_show_available_event_modes(struct device *dev,
437 struct device_attribute *attr,
438 char *buf)
439{
440 return sprintf(buf, "comparator\ninterrupt\n");
441}
442
443static ssize_t adt7410_show_fault_queue(struct device *dev,
444 struct device_attribute *attr,
445 char *buf)
446{
447 struct iio_dev *dev_info = dev_to_iio_dev(dev);
448 struct adt7410_chip_info *chip = iio_priv(dev_info);
449 int ret;
450
451 ret = adt7410_i2c_read_byte(chip, ADT7410_CONFIG, &chip->config);
452 if (ret)
453 return -EIO;
454
455 return sprintf(buf, "%d\n", chip->config & ADT7410_FAULT_QUEUE_MASK);
456}
457
458static ssize_t adt7410_set_fault_queue(struct device *dev,
459 struct device_attribute *attr,
460 const char *buf,
461 size_t len)
462{
463 struct iio_dev *dev_info = dev_to_iio_dev(dev);
464 struct adt7410_chip_info *chip = iio_priv(dev_info);
465 unsigned long data;
466 int ret;
467 u8 config;
468
469 ret = strict_strtoul(buf, 10, &data);
470 if (ret || data > 3)
471 return -EINVAL;
472
473 ret = adt7410_i2c_read_byte(chip, ADT7410_CONFIG, &chip->config);
474 if (ret)
475 return -EIO;
476
477 config = chip->config & ~ADT7410_FAULT_QUEUE_MASK;
478 config |= data;
479 ret = adt7410_i2c_write_byte(chip, ADT7410_CONFIG, config);
480 if (ret)
481 return -EIO;
482
483 chip->config = config;
484
485 return ret;
486}
487
488static inline ssize_t adt7410_show_t_bound(struct device *dev,
489 struct device_attribute *attr,
490 u8 bound_reg,
491 char *buf)
492{
493 struct iio_dev *dev_info = dev_to_iio_dev(dev);
494 struct adt7410_chip_info *chip = iio_priv(dev_info);
495 u16 data;
496 int ret;
497
498 ret = adt7410_i2c_read_word(chip, bound_reg, &data);
499 if (ret)
500 return -EIO;
501
502 return adt7410_convert_temperature(chip, data, buf);
503}
504
505static inline ssize_t adt7410_set_t_bound(struct device *dev,
506 struct device_attribute *attr,
507 u8 bound_reg,
508 const char *buf,
509 size_t len)
510{
511 struct iio_dev *dev_info = dev_to_iio_dev(dev);
512 struct adt7410_chip_info *chip = iio_priv(dev_info);
513 long tmp1, tmp2;
514 u16 data;
515 char *pos;
516 int ret;
517
518 pos = strchr(buf, '.');
519
520 ret = strict_strtol(buf, 10, &tmp1);
521
522 if (ret || tmp1 > 127 || tmp1 < -128)
523 return -EINVAL;
524
525 if (pos) {
526 len = strlen(pos);
527
528 if (chip->config & ADT7410_RESOLUTION) {
529 if (len > ADT7410_T16_VALUE_FLOAT_OFFSET)
530 len = ADT7410_T16_VALUE_FLOAT_OFFSET;
531 pos[len] = 0;
532 ret = strict_strtol(pos, 10, &tmp2);
533
534 if (!ret)
535 tmp2 = (tmp2 / 78125) * 78125;
536 } else {
537 if (len > ADT7410_T13_VALUE_FLOAT_OFFSET)
538 len = ADT7410_T13_VALUE_FLOAT_OFFSET;
539 pos[len] = 0;
540 ret = strict_strtol(pos, 10, &tmp2);
541
542 if (!ret)
543 tmp2 = (tmp2 / 625) * 625;
544 }
545 }
546
547 if (tmp1 < 0)
548 data = (u16)(-tmp1);
549 else
550 data = (u16)tmp1;
551
552 if (chip->config & ADT7410_RESOLUTION) {
553 data = (data << ADT7410_T16_VALUE_FLOAT_OFFSET) |
554 (tmp2 & ADT7410_T16_VALUE_FLOAT_MASK);
555
556 if (tmp1 < 0)
557 /* convert positive value to supplyment */
558 data = (u16)((ADT7410_T16_VALUE_SIGN << 1) - (u32)data);
559 } else {
560 data = (data << ADT7410_T13_VALUE_FLOAT_OFFSET) |
561 (tmp2 & ADT7410_T13_VALUE_FLOAT_MASK);
562
563 if (tmp1 < 0)
564 /* convert positive value to supplyment */
565 data = (ADT7410_T13_VALUE_SIGN << 1) - data;
566 data <<= ADT7410_T13_VALUE_OFFSET;
567 }
568
569 ret = adt7410_i2c_write_word(chip, bound_reg, data);
570 if (ret)
571 return -EIO;
572
573 return ret;
574}
575
576static ssize_t adt7410_show_t_alarm_high(struct device *dev,
577 struct device_attribute *attr,
578 char *buf)
579{
580 return adt7410_show_t_bound(dev, attr,
581 ADT7410_T_ALARM_HIGH, buf);
582}
583
584static inline ssize_t adt7410_set_t_alarm_high(struct device *dev,
585 struct device_attribute *attr,
586 const char *buf,
587 size_t len)
588{
589 return adt7410_set_t_bound(dev, attr,
590 ADT7410_T_ALARM_HIGH, buf, len);
591}
592
593static ssize_t adt7410_show_t_alarm_low(struct device *dev,
594 struct device_attribute *attr,
595 char *buf)
596{
597 return adt7410_show_t_bound(dev, attr,
598 ADT7410_T_ALARM_LOW, buf);
599}
600
601static inline ssize_t adt7410_set_t_alarm_low(struct device *dev,
602 struct device_attribute *attr,
603 const char *buf,
604 size_t len)
605{
606 return adt7410_set_t_bound(dev, attr,
607 ADT7410_T_ALARM_LOW, buf, len);
608}
609
610static ssize_t adt7410_show_t_crit(struct device *dev,
611 struct device_attribute *attr,
612 char *buf)
613{
614 return adt7410_show_t_bound(dev, attr,
615 ADT7410_T_CRIT, buf);
616}
617
618static inline ssize_t adt7410_set_t_crit(struct device *dev,
619 struct device_attribute *attr,
620 const char *buf,
621 size_t len)
622{
623 return adt7410_set_t_bound(dev, attr,
624 ADT7410_T_CRIT, buf, len);
625}
626
627static ssize_t adt7410_show_t_hyst(struct device *dev,
628 struct device_attribute *attr,
629 char *buf)
630{
631 struct iio_dev *dev_info = dev_to_iio_dev(dev);
632 struct adt7410_chip_info *chip = iio_priv(dev_info);
633 int ret;
634 u8 t_hyst;
635
636 ret = adt7410_i2c_read_byte(chip, ADT7410_T_HYST, &t_hyst);
637 if (ret)
638 return -EIO;
639
640 return sprintf(buf, "%d\n", t_hyst & ADT7410_T_HYST_MASK);
641}
642
643static inline ssize_t adt7410_set_t_hyst(struct device *dev,
644 struct device_attribute *attr,
645 const char *buf,
646 size_t len)
647{
648 struct iio_dev *dev_info = dev_to_iio_dev(dev);
649 struct adt7410_chip_info *chip = iio_priv(dev_info);
650 int ret;
651 unsigned long data;
652 u8 t_hyst;
653
654 ret = strict_strtol(buf, 10, &data);
655
656 if (ret || data > ADT7410_T_HYST_MASK)
657 return -EINVAL;
658
659 t_hyst = (u8)data;
660
661 ret = adt7410_i2c_write_byte(chip, ADT7410_T_HYST, t_hyst);
662 if (ret)
663 return -EIO;
664
665 return ret;
666}
667
668static IIO_DEVICE_ATTR(event_mode,
669 S_IRUGO | S_IWUSR,
670 adt7410_show_event_mode, adt7410_set_event_mode, 0);
671static IIO_DEVICE_ATTR(available_event_modes,
672 S_IRUGO,
673 adt7410_show_available_event_modes, NULL, 0);
674static IIO_DEVICE_ATTR(fault_queue,
675 S_IRUGO | S_IWUSR,
676 adt7410_show_fault_queue, adt7410_set_fault_queue, 0);
677static IIO_DEVICE_ATTR(t_alarm_high,
678 S_IRUGO | S_IWUSR,
679 adt7410_show_t_alarm_high, adt7410_set_t_alarm_high, 0);
680static IIO_DEVICE_ATTR(t_alarm_low,
681 S_IRUGO | S_IWUSR,
682 adt7410_show_t_alarm_low, adt7410_set_t_alarm_low, 0);
683static IIO_DEVICE_ATTR(t_crit,
684 S_IRUGO | S_IWUSR,
685 adt7410_show_t_crit, adt7410_set_t_crit, 0);
686static IIO_DEVICE_ATTR(t_hyst,
687 S_IRUGO | S_IWUSR,
688 adt7410_show_t_hyst, adt7410_set_t_hyst, 0);
689
690static struct attribute *adt7410_event_int_attributes[] = {
691 &iio_dev_attr_event_mode.dev_attr.attr,
692 &iio_dev_attr_available_event_modes.dev_attr.attr,
693 &iio_dev_attr_fault_queue.dev_attr.attr,
694 &iio_dev_attr_t_alarm_high.dev_attr.attr,
695 &iio_dev_attr_t_alarm_low.dev_attr.attr,
696 &iio_dev_attr_t_crit.dev_attr.attr,
697 &iio_dev_attr_t_hyst.dev_attr.attr,
698 NULL,
699};
700
701static struct attribute_group adt7410_event_attribute_group = {
702 .attrs = adt7410_event_int_attributes,
703 .name = "events",
704};
705
706static const struct iio_info adt7410_info = {
707 .attrs = &adt7410_attribute_group,
708 .event_attrs = &adt7410_event_attribute_group,
709 .driver_module = THIS_MODULE,
710};
711
712/*
713 * device probe and remove
714 */
715
716static int __devinit adt7410_probe(struct i2c_client *client,
717 const struct i2c_device_id *id)
718{
719 struct adt7410_chip_info *chip;
720 struct iio_dev *indio_dev;
721 int ret = 0;
722 unsigned long *adt7410_platform_data = client->dev.platform_data;
723
724 indio_dev = iio_device_alloc(sizeof(*chip));
725 if (indio_dev == NULL) {
726 ret = -ENOMEM;
727 goto error_ret;
728 }
729 chip = iio_priv(indio_dev);
730 /* this is only used for device removal purposes */
731 i2c_set_clientdata(client, indio_dev);
732
733 chip->client = client;
734
735 indio_dev->name = id->name;
736 indio_dev->dev.parent = &client->dev;
737 indio_dev->info = &adt7410_info;
738 indio_dev->modes = INDIO_DIRECT_MODE;
739
740 /* CT critcal temperature event. line 0 */
741 if (client->irq) {
742 ret = request_threaded_irq(client->irq,
743 NULL,
744 &adt7410_event_handler,
745 IRQF_TRIGGER_LOW,
746 id->name,
747 indio_dev);
748 if (ret)
749 goto error_free_dev;
750 }
751
752 /* INT bound temperature alarm event. line 1 */
753 if (adt7410_platform_data[0]) {
754 ret = request_threaded_irq(adt7410_platform_data[0],
755 NULL,
756 &adt7410_event_handler,
757 adt7410_platform_data[1],
758 id->name,
759 indio_dev);
760 if (ret)
761 goto error_unreg_ct_irq;
762 }
763
764 if (client->irq && adt7410_platform_data[0]) {
765
766 ret = adt7410_i2c_read_byte(chip, ADT7410_CONFIG, &chip->config);
767 if (ret) {
768 ret = -EIO;
769 goto error_unreg_int_irq;
770 }
771
772 /* set irq polarity low level */
773 chip->config &= ~ADT7410_CT_POLARITY;
774
775 if (adt7410_platform_data[1] & IRQF_TRIGGER_HIGH)
776 chip->config |= ADT7410_INT_POLARITY;
777 else
778 chip->config &= ~ADT7410_INT_POLARITY;
779
780 ret = adt7410_i2c_write_byte(chip, ADT7410_CONFIG, chip->config);
781 if (ret) {
782 ret = -EIO;
783 goto error_unreg_int_irq;
784 }
785 }
786 ret = iio_device_register(indio_dev);
787 if (ret)
788 goto error_unreg_int_irq;
789
790 dev_info(&client->dev, "%s temperature sensor registered.\n",
791 id->name);
792
793 return 0;
794
795error_unreg_int_irq:
796 free_irq(adt7410_platform_data[0], indio_dev);
797error_unreg_ct_irq:
798 free_irq(client->irq, indio_dev);
799error_free_dev:
800 iio_device_free(indio_dev);
801error_ret:
802 return ret;
803}
804
805static int __devexit adt7410_remove(struct i2c_client *client)
806{
807 struct iio_dev *indio_dev = i2c_get_clientdata(client);
808 unsigned long *adt7410_platform_data = client->dev.platform_data;
809
810 iio_device_unregister(indio_dev);
811 if (adt7410_platform_data[0])
812 free_irq(adt7410_platform_data[0], indio_dev);
813 if (client->irq)
814 free_irq(client->irq, indio_dev);
815 iio_device_free(indio_dev);
816
817 return 0;
818}
819
820static const struct i2c_device_id adt7410_id[] = {
821 { "adt7410", 0 },
822 {}
823};
824
825MODULE_DEVICE_TABLE(i2c, adt7410_id);
826
827static struct i2c_driver adt7410_driver = {
828 .driver = {
829 .name = "adt7410",
830 },
831 .probe = adt7410_probe,
832 .remove = __devexit_p(adt7410_remove),
833 .id_table = adt7410_id,
834};
835module_i2c_driver(adt7410_driver);
836
837MODULE_AUTHOR("Sonic Zhang <sonic.zhang@analog.com>");
838MODULE_DESCRIPTION("Analog Devices ADT7410 digital"
839 " temperature sensor driver");
840MODULE_LICENSE("GPL v2");