2 * ADT7410 digital temperature sensor driver supporting ADT7410
4 * Copyright 2010 Analog Devices Inc.
6 * Licensed under the GPL-2 or later.
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>
22 * ADT7410 registers definition
25 #define ADT7410_TEMPERATURE 0
26 #define ADT7410_STATUS 2
27 #define ADT7410_CONFIG 3
28 #define ADT7410_T_ALARM_HIGH 4
29 #define ADT7410_T_ALARM_LOW 6
30 #define ADT7410_T_CRIT 8
31 #define ADT7410_T_HYST 0xA
32 #define ADT7410_ID 0xB
33 #define ADT7410_RESET 0x2F
38 #define ADT7410_STAT_T_LOW 0x10
39 #define ADT7410_STAT_T_HIGH 0x20
40 #define ADT7410_STAT_T_CRIT 0x40
41 #define ADT7410_STAT_NOT_RDY 0x80
46 #define ADT7410_FAULT_QUEUE_MASK 0x3
47 #define ADT7410_CT_POLARITY 0x4
48 #define ADT7410_INT_POLARITY 0x8
49 #define ADT7410_EVENT_MODE 0x10
50 #define ADT7410_MODE_MASK 0x60
51 #define ADT7410_ONESHOT 0x20
52 #define ADT7410_SPS 0x40
53 #define ADT7410_PD 0x60
54 #define ADT7410_RESOLUTION 0x80
59 #define ADT7410_T16_VALUE_SIGN 0x8000
60 #define ADT7410_T16_VALUE_FLOAT_OFFSET 7
61 #define ADT7410_T16_VALUE_FLOAT_MASK 0x7F
62 #define ADT7410_T13_VALUE_SIGN 0x1000
63 #define ADT7410_T13_VALUE_OFFSET 3
64 #define ADT7410_T13_VALUE_FLOAT_OFFSET 4
65 #define ADT7410_T13_VALUE_FLOAT_MASK 0xF
66 #define ADT7410_T_HYST_MASK 0xF
67 #define ADT7410_DEVICE_ID_MASK 0xF
68 #define ADT7410_MANUFACTORY_ID_MASK 0xF0
69 #define ADT7410_MANUFACTORY_ID_OFFSET 4
71 #define ADT7410_IRQS 2
74 * struct adt7410_chip_info - chip specifc information
77 struct adt7410_chip_info {
78 struct i2c_client *client;
83 * adt7410 register access by I2C
86 static int adt7410_i2c_read_word(struct adt7410_chip_info *chip, u8 reg, u16 *data)
88 struct i2c_client *client = chip->client;
91 ret = i2c_smbus_read_word_data(client, reg);
93 dev_err(&client->dev, "I2C read error\n");
97 *data = swab16((u16)ret);
102 static int adt7410_i2c_write_word(struct adt7410_chip_info *chip, u8 reg, u16 data)
104 struct i2c_client *client = chip->client;
107 ret = i2c_smbus_write_word_data(client, reg, swab16(data));
109 dev_err(&client->dev, "I2C write error\n");
114 static int adt7410_i2c_read_byte(struct adt7410_chip_info *chip, u8 reg, u8 *data)
116 struct i2c_client *client = chip->client;
119 ret = i2c_smbus_read_byte_data(client, reg);
121 dev_err(&client->dev, "I2C read error\n");
130 static int adt7410_i2c_write_byte(struct adt7410_chip_info *chip, u8 reg, u8 data)
132 struct i2c_client *client = chip->client;
135 ret = i2c_smbus_write_byte_data(client, reg, data);
137 dev_err(&client->dev, "I2C write error\n");
142 static ssize_t adt7410_show_mode(struct device *dev,
143 struct device_attribute *attr,
146 struct iio_dev *dev_info = dev_get_drvdata(dev);
147 struct adt7410_chip_info *chip = iio_priv(dev_info);
150 config = chip->config & ADT7410_MODE_MASK;
154 return sprintf(buf, "power-down\n");
155 case ADT7410_ONESHOT:
156 return sprintf(buf, "one-shot\n");
158 return sprintf(buf, "sps\n");
160 return sprintf(buf, "full\n");
164 static ssize_t adt7410_store_mode(struct device *dev,
165 struct device_attribute *attr,
169 struct iio_dev *dev_info = dev_get_drvdata(dev);
170 struct adt7410_chip_info *chip = iio_priv(dev_info);
174 ret = adt7410_i2c_read_byte(chip, ADT7410_CONFIG, &chip->config);
178 config = chip->config & (~ADT7410_MODE_MASK);
179 if (strcmp(buf, "power-down"))
180 config |= ADT7410_PD;
181 else if (strcmp(buf, "one-shot"))
182 config |= ADT7410_ONESHOT;
183 else if (strcmp(buf, "sps"))
184 config |= ADT7410_SPS;
186 ret = adt7410_i2c_write_byte(chip, ADT7410_CONFIG, config);
190 chip->config = config;
195 static IIO_DEVICE_ATTR(mode, S_IRUGO | S_IWUSR,
200 static ssize_t adt7410_show_available_modes(struct device *dev,
201 struct device_attribute *attr,
204 return sprintf(buf, "full\none-shot\nsps\npower-down\n");
207 static IIO_DEVICE_ATTR(available_modes, S_IRUGO, adt7410_show_available_modes, NULL, 0);
209 static ssize_t adt7410_show_resolution(struct device *dev,
210 struct device_attribute *attr,
213 struct iio_dev *dev_info = dev_get_drvdata(dev);
214 struct adt7410_chip_info *chip = iio_priv(dev_info);
218 ret = adt7410_i2c_read_byte(chip, ADT7410_CONFIG, &chip->config);
222 if (chip->config & ADT7410_RESOLUTION)
227 return sprintf(buf, "%d bits\n", bits);
230 static ssize_t adt7410_store_resolution(struct device *dev,
231 struct device_attribute *attr,
235 struct iio_dev *dev_info = dev_get_drvdata(dev);
236 struct adt7410_chip_info *chip = iio_priv(dev_info);
241 ret = strict_strtoul(buf, 10, &data);
245 ret = adt7410_i2c_read_byte(chip, ADT7410_CONFIG, &chip->config);
249 config = chip->config & (~ADT7410_RESOLUTION);
251 config |= ADT7410_RESOLUTION;
253 ret = adt7410_i2c_write_byte(chip, ADT7410_CONFIG, config);
257 chip->config = config;
262 static IIO_DEVICE_ATTR(resolution, S_IRUGO | S_IWUSR,
263 adt7410_show_resolution,
264 adt7410_store_resolution,
267 static ssize_t adt7410_show_id(struct device *dev,
268 struct device_attribute *attr,
271 struct iio_dev *dev_info = dev_get_drvdata(dev);
272 struct adt7410_chip_info *chip = iio_priv(dev_info);
276 ret = adt7410_i2c_read_byte(chip, ADT7410_ID, &id);
280 return sprintf(buf, "device id: 0x%x\nmanufactory id: 0x%x\n",
281 id & ADT7410_DEVICE_ID_MASK,
282 (id & ADT7410_MANUFACTORY_ID_MASK) >> ADT7410_MANUFACTORY_ID_OFFSET);
285 static IIO_DEVICE_ATTR(id, S_IRUGO | S_IWUSR,
290 static ssize_t adt7410_convert_temperature(struct adt7410_chip_info *chip,
295 if (chip->config & ADT7410_RESOLUTION) {
296 if (data & ADT7410_T16_VALUE_SIGN) {
297 /* convert supplement to positive value */
298 data = (u16)((ADT7410_T16_VALUE_SIGN << 1) - (u32)data);
301 return sprintf(buf, "%c%d.%.7d\n", sign,
302 (data >> ADT7410_T16_VALUE_FLOAT_OFFSET),
303 (data & ADT7410_T16_VALUE_FLOAT_MASK) * 78125);
305 if (data & ADT7410_T13_VALUE_SIGN) {
306 /* convert supplement to positive value */
307 data >>= ADT7410_T13_VALUE_OFFSET;
308 data = (ADT7410_T13_VALUE_SIGN << 1) - data;
311 return sprintf(buf, "%c%d.%.4d\n", sign,
312 (data >> ADT7410_T13_VALUE_FLOAT_OFFSET),
313 (data & ADT7410_T13_VALUE_FLOAT_MASK) * 625);
317 static ssize_t adt7410_show_value(struct device *dev,
318 struct device_attribute *attr,
321 struct iio_dev *dev_info = dev_get_drvdata(dev);
322 struct adt7410_chip_info *chip = iio_priv(dev_info);
328 ret = adt7410_i2c_read_byte(chip, ADT7410_STATUS, &status);
334 } while (status & ADT7410_STAT_NOT_RDY);
336 ret = adt7410_i2c_read_word(chip, ADT7410_TEMPERATURE, &data);
340 return adt7410_convert_temperature(chip, data, buf);
343 static IIO_DEVICE_ATTR(value, S_IRUGO, adt7410_show_value, NULL, 0);
345 static struct attribute *adt7410_attributes[] = {
346 &iio_dev_attr_available_modes.dev_attr.attr,
347 &iio_dev_attr_mode.dev_attr.attr,
348 &iio_dev_attr_resolution.dev_attr.attr,
349 &iio_dev_attr_id.dev_attr.attr,
350 &iio_dev_attr_value.dev_attr.attr,
354 static const struct attribute_group adt7410_attribute_group = {
355 .attrs = adt7410_attributes,
358 static irqreturn_t adt7410_event_handler(int irq, void *private)
360 struct iio_dev *indio_dev = private;
361 struct adt7410_chip_info *chip = iio_priv(indio_dev);
362 s64 timestamp = iio_get_time_ns();
365 if (adt7410_i2c_read_byte(chip, ADT7410_STATUS, &status))
368 if (status & ADT7410_STAT_T_HIGH)
369 iio_push_event(indio_dev,
370 IIO_UNMOD_EVENT_CODE(IIO_TEMP, 0,
374 if (status & ADT7410_STAT_T_LOW)
375 iio_push_event(indio_dev,
376 IIO_UNMOD_EVENT_CODE(IIO_TEMP, 0,
380 if (status & ADT7410_STAT_T_CRIT)
381 iio_push_event(indio_dev,
382 IIO_UNMOD_EVENT_CODE(IIO_TEMP, 0,
390 static ssize_t adt7410_show_event_mode(struct device *dev,
391 struct device_attribute *attr,
394 struct iio_dev *dev_info = dev_get_drvdata(dev);
395 struct adt7410_chip_info *chip = iio_priv(dev_info);
398 ret = adt7410_i2c_read_byte(chip, ADT7410_CONFIG, &chip->config);
402 if (chip->config & ADT7410_EVENT_MODE)
403 return sprintf(buf, "interrupt\n");
405 return sprintf(buf, "comparator\n");
408 static ssize_t adt7410_set_event_mode(struct device *dev,
409 struct device_attribute *attr,
413 struct iio_dev *dev_info = dev_get_drvdata(dev);
414 struct adt7410_chip_info *chip = iio_priv(dev_info);
418 ret = adt7410_i2c_read_byte(chip, ADT7410_CONFIG, &chip->config);
422 config = chip->config &= ~ADT7410_EVENT_MODE;
423 if (strcmp(buf, "comparator") != 0)
424 config |= ADT7410_EVENT_MODE;
426 ret = adt7410_i2c_write_byte(chip, ADT7410_CONFIG, config);
430 chip->config = config;
435 static ssize_t adt7410_show_available_event_modes(struct device *dev,
436 struct device_attribute *attr,
439 return sprintf(buf, "comparator\ninterrupt\n");
442 static ssize_t adt7410_show_fault_queue(struct device *dev,
443 struct device_attribute *attr,
446 struct iio_dev *dev_info = dev_get_drvdata(dev);
447 struct adt7410_chip_info *chip = iio_priv(dev_info);
450 ret = adt7410_i2c_read_byte(chip, ADT7410_CONFIG, &chip->config);
454 return sprintf(buf, "%d\n", chip->config & ADT7410_FAULT_QUEUE_MASK);
457 static ssize_t adt7410_set_fault_queue(struct device *dev,
458 struct device_attribute *attr,
462 struct iio_dev *dev_info = dev_get_drvdata(dev);
463 struct adt7410_chip_info *chip = iio_priv(dev_info);
468 ret = strict_strtoul(buf, 10, &data);
472 ret = adt7410_i2c_read_byte(chip, ADT7410_CONFIG, &chip->config);
476 config = chip->config & ~ADT7410_FAULT_QUEUE_MASK;
478 ret = adt7410_i2c_write_byte(chip, ADT7410_CONFIG, config);
482 chip->config = config;
487 static inline ssize_t adt7410_show_t_bound(struct device *dev,
488 struct device_attribute *attr,
492 struct iio_dev *dev_info = dev_get_drvdata(dev);
493 struct adt7410_chip_info *chip = iio_priv(dev_info);
497 ret = adt7410_i2c_read_word(chip, bound_reg, &data);
501 return adt7410_convert_temperature(chip, data, buf);
504 static inline ssize_t adt7410_set_t_bound(struct device *dev,
505 struct device_attribute *attr,
510 struct iio_dev *dev_info = dev_get_drvdata(dev);
511 struct adt7410_chip_info *chip = iio_priv(dev_info);
517 pos = strchr(buf, '.');
519 ret = strict_strtol(buf, 10, &tmp1);
521 if (ret || tmp1 > 127 || tmp1 < -128)
527 if (chip->config & ADT7410_RESOLUTION) {
528 if (len > ADT7410_T16_VALUE_FLOAT_OFFSET)
529 len = ADT7410_T16_VALUE_FLOAT_OFFSET;
531 ret = strict_strtol(pos, 10, &tmp2);
534 tmp2 = (tmp2 / 78125) * 78125;
536 if (len > ADT7410_T13_VALUE_FLOAT_OFFSET)
537 len = ADT7410_T13_VALUE_FLOAT_OFFSET;
539 ret = strict_strtol(pos, 10, &tmp2);
542 tmp2 = (tmp2 / 625) * 625;
551 if (chip->config & ADT7410_RESOLUTION) {
552 data = (data << ADT7410_T16_VALUE_FLOAT_OFFSET) |
553 (tmp2 & ADT7410_T16_VALUE_FLOAT_MASK);
556 /* convert positive value to supplyment */
557 data = (u16)((ADT7410_T16_VALUE_SIGN << 1) - (u32)data);
559 data = (data << ADT7410_T13_VALUE_FLOAT_OFFSET) |
560 (tmp2 & ADT7410_T13_VALUE_FLOAT_MASK);
563 /* convert positive value to supplyment */
564 data = (ADT7410_T13_VALUE_SIGN << 1) - data;
565 data <<= ADT7410_T13_VALUE_OFFSET;
568 ret = adt7410_i2c_write_word(chip, bound_reg, data);
575 static ssize_t adt7410_show_t_alarm_high(struct device *dev,
576 struct device_attribute *attr,
579 return adt7410_show_t_bound(dev, attr,
580 ADT7410_T_ALARM_HIGH, buf);
583 static inline ssize_t adt7410_set_t_alarm_high(struct device *dev,
584 struct device_attribute *attr,
588 return adt7410_set_t_bound(dev, attr,
589 ADT7410_T_ALARM_HIGH, buf, len);
592 static ssize_t adt7410_show_t_alarm_low(struct device *dev,
593 struct device_attribute *attr,
596 return adt7410_show_t_bound(dev, attr,
597 ADT7410_T_ALARM_LOW, buf);
600 static inline ssize_t adt7410_set_t_alarm_low(struct device *dev,
601 struct device_attribute *attr,
605 return adt7410_set_t_bound(dev, attr,
606 ADT7410_T_ALARM_LOW, buf, len);
609 static ssize_t adt7410_show_t_crit(struct device *dev,
610 struct device_attribute *attr,
613 return adt7410_show_t_bound(dev, attr,
614 ADT7410_T_CRIT, buf);
617 static inline ssize_t adt7410_set_t_crit(struct device *dev,
618 struct device_attribute *attr,
622 return adt7410_set_t_bound(dev, attr,
623 ADT7410_T_CRIT, buf, len);
626 static ssize_t adt7410_show_t_hyst(struct device *dev,
627 struct device_attribute *attr,
630 struct iio_dev *dev_info = dev_get_drvdata(dev);
631 struct adt7410_chip_info *chip = iio_priv(dev_info);
635 ret = adt7410_i2c_read_byte(chip, ADT7410_T_HYST, &t_hyst);
639 return sprintf(buf, "%d\n", t_hyst & ADT7410_T_HYST_MASK);
642 static inline ssize_t adt7410_set_t_hyst(struct device *dev,
643 struct device_attribute *attr,
647 struct iio_dev *dev_info = dev_get_drvdata(dev);
648 struct adt7410_chip_info *chip = iio_priv(dev_info);
653 ret = strict_strtol(buf, 10, &data);
655 if (ret || data > ADT7410_T_HYST_MASK)
660 ret = adt7410_i2c_write_byte(chip, ADT7410_T_HYST, t_hyst);
667 static IIO_DEVICE_ATTR(event_mode,
669 adt7410_show_event_mode, adt7410_set_event_mode, 0);
670 static IIO_DEVICE_ATTR(available_event_modes,
672 adt7410_show_available_event_modes, NULL, 0);
673 static IIO_DEVICE_ATTR(fault_queue,
675 adt7410_show_fault_queue, adt7410_set_fault_queue, 0);
676 static IIO_DEVICE_ATTR(t_alarm_high,
678 adt7410_show_t_alarm_high, adt7410_set_t_alarm_high, 0);
679 static IIO_DEVICE_ATTR(t_alarm_low,
681 adt7410_show_t_alarm_low, adt7410_set_t_alarm_low, 0);
682 static IIO_DEVICE_ATTR(t_crit,
684 adt7410_show_t_crit, adt7410_set_t_crit, 0);
685 static IIO_DEVICE_ATTR(t_hyst,
687 adt7410_show_t_hyst, adt7410_set_t_hyst, 0);
689 static struct attribute *adt7410_event_int_attributes[] = {
690 &iio_dev_attr_event_mode.dev_attr.attr,
691 &iio_dev_attr_available_event_modes.dev_attr.attr,
692 &iio_dev_attr_fault_queue.dev_attr.attr,
693 &iio_dev_attr_t_alarm_high.dev_attr.attr,
694 &iio_dev_attr_t_alarm_low.dev_attr.attr,
695 &iio_dev_attr_t_hyst.dev_attr.attr,
699 static struct attribute *adt7410_event_ct_attributes[] = {
700 &iio_dev_attr_event_mode.dev_attr.attr,
701 &iio_dev_attr_available_event_modes.dev_attr.attr,
702 &iio_dev_attr_fault_queue.dev_attr.attr,
703 &iio_dev_attr_t_crit.dev_attr.attr,
704 &iio_dev_attr_t_hyst.dev_attr.attr,
708 static struct attribute_group adt7410_event_attribute_group[ADT7410_IRQS] = {
710 .attrs = adt7410_event_int_attributes,
713 .attrs = adt7410_event_ct_attributes,
718 static const struct iio_info adt7410_info = {
719 .attrs = &adt7410_attribute_group,
720 .event_attrs = adt7410_event_attribute_group,
721 .driver_module = THIS_MODULE,
725 * device probe and remove
728 static int __devinit adt7410_probe(struct i2c_client *client,
729 const struct i2c_device_id *id)
731 struct adt7410_chip_info *chip;
732 struct iio_dev *indio_dev;
734 unsigned long *adt7410_platform_data = client->dev.platform_data;
736 indio_dev = iio_allocate_device(sizeof(*chip));
737 if (indio_dev == NULL) {
741 chip = iio_priv(indio_dev);
742 /* this is only used for device removal purposes */
743 i2c_set_clientdata(client, indio_dev);
745 chip->client = client;
747 indio_dev->name = id->name;
748 indio_dev->dev.parent = &client->dev;
749 indio_dev->info = &adt7410_info;
750 indio_dev->modes = INDIO_DIRECT_MODE;
752 /* CT critcal temperature event. line 0 */
754 ret = request_threaded_irq(client->irq,
756 &adt7410_event_handler,
764 /* INT bound temperature alarm event. line 1 */
765 if (adt7410_platform_data[0]) {
766 ret = request_threaded_irq(adt7410_platform_data[0],
768 &adt7410_event_handler,
769 adt7410_platform_data[1],
773 goto error_unreg_ct_irq;
776 if (client->irq && adt7410_platform_data[0]) {
778 ret = adt7410_i2c_read_byte(chip, ADT7410_CONFIG, &chip->config);
781 goto error_unreg_int_irq;
784 /* set irq polarity low level */
785 chip->config &= ~ADT7410_CT_POLARITY;
787 if (adt7410_platform_data[1] & IRQF_TRIGGER_HIGH)
788 chip->config |= ADT7410_INT_POLARITY;
790 chip->config &= ~ADT7410_INT_POLARITY;
792 ret = adt7410_i2c_write_byte(chip, ADT7410_CONFIG, chip->config);
795 goto error_unreg_int_irq;
798 ret = iio_device_register(indio_dev);
800 goto error_unreg_int_irq;
802 dev_info(&client->dev, "%s temperature sensor registered.\n",
808 free_irq(adt7410_platform_data[0], indio_dev);
810 free_irq(client->irq, indio_dev);
812 iio_free_device(indio_dev);
817 static int __devexit adt7410_remove(struct i2c_client *client)
819 struct iio_dev *indio_dev = i2c_get_clientdata(client);
820 unsigned long *adt7410_platform_data = client->dev.platform_data;
822 iio_device_unregister(indio_dev);
823 if (adt7410_platform_data[0])
824 free_irq(adt7410_platform_data[0], indio_dev);
826 free_irq(client->irq, indio_dev);
827 iio_free_device(indio_dev);
832 static const struct i2c_device_id adt7410_id[] = {
837 MODULE_DEVICE_TABLE(i2c, adt7410_id);
839 static struct i2c_driver adt7410_driver = {
843 .probe = adt7410_probe,
844 .remove = __devexit_p(adt7410_remove),
845 .id_table = adt7410_id,
847 module_i2c_driver(adt7410_driver);
849 MODULE_AUTHOR("Sonic Zhang <sonic.zhang@analog.com>");
850 MODULE_DESCRIPTION("Analog Devices ADT7410 digital"
851 " temperature sensor driver");
852 MODULE_LICENSE("GPL v2");