drivers/hwmon/adt7x10.c - linux - Git at Google

 // SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * adt7x10.c - Part of lm_sensors, Linux kernel modules for hardware
  *	 monitoring
  * This driver handles the ADT7410 and compatible digital temperature sensors.
  * Hartmut Knaack <knaack.h@gmx.de> 2012-07-22
  * based on lm75.c by Frodo Looijaard <frodol@dds.nl>
  * and adt7410.c from iio-staging by Sonic Zhang <sonic.zhang@analog.com>
  */

 #include <linux/device.h>
 #include <linux/module.h>
 #include <linux/init.h>
 #include <linux/slab.h>
 #include <linux/jiffies.h>
 #include <linux/hwmon.h>
 #include <linux/err.h>
 #include <linux/mutex.h>
 #include <linux/delay.h>
 #include <linux/interrupt.h>
 #include <linux/regmap.h>

 #include "adt7x10.h"

 /*
  * ADT7X10 status
  */
 #define ADT7X10_STAT_T_LOW		(1 << 4)
 #define ADT7X10_STAT_T_HIGH		(1 << 5)
 #define ADT7X10_STAT_T_CRIT		(1 << 6)
 #define ADT7X10_STAT_NOT_RDY		(1 << 7)

 /*
  * ADT7X10 config
  */
 #define ADT7X10_FAULT_QUEUE_MASK	(1 << 0 | 1 << 1)
 #define ADT7X10_CT_POLARITY		(1 << 2)
 #define ADT7X10_INT_POLARITY		(1 << 3)
 #define ADT7X10_EVENT_MODE		(1 << 4)
 #define ADT7X10_MODE_MASK		(1 << 5 | 1 << 6)
 #define ADT7X10_FULL			(0 << 5 | 0 << 6)
 #define ADT7X10_PD			(1 << 5 | 1 << 6)
 #define ADT7X10_RESOLUTION		(1 << 7)

 /*
  * ADT7X10 masks
  */
 #define ADT7X10_T13_VALUE_MASK		0xFFF8
 #define ADT7X10_T_HYST_MASK		0xF

 /* straight from the datasheet */
 #define ADT7X10_TEMP_MIN (-55000)
 #define ADT7X10_TEMP_MAX 150000

 /* Each client has this additional data */
 struct adt7x10_data {
 	struct regmap		*regmap;
 	struct mutex		update_lock;
 	u8			config;
 	u8			oldconfig;
 	bool			valid;		/* true if temperature valid */
 };

 enum {
 	adt7x10_temperature = 0,
 	adt7x10_t_alarm_high,
 	adt7x10_t_alarm_low,
 	adt7x10_t_crit,
 };

 static const u8 ADT7X10_REG_TEMP[] = {
 	[adt7x10_temperature] = ADT7X10_TEMPERATURE,		/* input */
 	[adt7x10_t_alarm_high] = ADT7X10_T_ALARM_HIGH,		/* high */
 	[adt7x10_t_alarm_low] = ADT7X10_T_ALARM_LOW,		/* low */
 	[adt7x10_t_crit] = ADT7X10_T_CRIT,			/* critical */
 };

 static irqreturn_t adt7x10_irq_handler(int irq, void *private)
 {
 	struct device *dev = private;
 	struct adt7x10_data *d = dev_get_drvdata(dev);
 	unsigned int status;
 	int ret;

 	ret = regmap_read(d->regmap, ADT7X10_STATUS, &status);
 	if (ret < 0)
 		return IRQ_HANDLED;

 	if (status & ADT7X10_STAT_T_HIGH)
 		hwmon_notify_event(dev, hwmon_temp, hwmon_temp_max_alarm, 0);
 	if (status & ADT7X10_STAT_T_LOW)
 		hwmon_notify_event(dev, hwmon_temp, hwmon_temp_min_alarm, 0);
 	if (status & ADT7X10_STAT_T_CRIT)
 		hwmon_notify_event(dev, hwmon_temp, hwmon_temp_crit_alarm, 0);

 	return IRQ_HANDLED;
 }

 static int adt7x10_temp_ready(struct regmap *regmap)
 {
 	unsigned int status;
 	int i, ret;

 	for (i = 0; i < 6; i++) {
 		ret = regmap_read(regmap, ADT7X10_STATUS, &status);
 		if (ret < 0)
 			return ret;
 		if (!(status & ADT7X10_STAT_NOT_RDY))
 			return 0;
 		msleep(60);
 	}
 	return -ETIMEDOUT;
 }

 static s16 ADT7X10_TEMP_TO_REG(long temp)
 {
 	return DIV_ROUND_CLOSEST(clamp_val(temp, ADT7X10_TEMP_MIN,
 					   ADT7X10_TEMP_MAX) * 128, 1000);
 }

 static int ADT7X10_REG_TO_TEMP(struct adt7x10_data *data, s16 reg)
 {
 	/* in 13 bit mode, bits 0-2 are status flags - mask them out */
 	if (!(data->config & ADT7X10_RESOLUTION))
 		reg &= ADT7X10_T13_VALUE_MASK;
 	/*
 	 * temperature is stored in twos complement format, in steps of
 	 * 1/128°C
 	 */
 	return DIV_ROUND_CLOSEST(reg * 1000, 128);
 }

 /*-----------------------------------------------------------------------*/

 static int adt7x10_temp_read(struct adt7x10_data *data, int index, long *val)
 {
 	unsigned int regval;
 	int ret;

 	mutex_lock(&data->update_lock);
 	if (index == adt7x10_temperature && !data->valid) {
 		/* wait for valid temperature */
 		ret = adt7x10_temp_ready(data->regmap);
 		if (ret) {
 			mutex_unlock(&data->update_lock);
 			return ret;
 		}
 		data->valid = true;
 	}
 	mutex_unlock(&data->update_lock);

 	ret = regmap_read(data->regmap, ADT7X10_REG_TEMP[index], &regval);
 	if (ret)
 		return ret;

 	*val = ADT7X10_REG_TO_TEMP(data, regval);
 	return 0;
 }

 static int adt7x10_temp_write(struct adt7x10_data *data, int index, long temp)
 {
 	int ret;

 	mutex_lock(&data->update_lock);
 	ret = regmap_write(data->regmap, ADT7X10_REG_TEMP[index],
 			   ADT7X10_TEMP_TO_REG(temp));
 	mutex_unlock(&data->update_lock);
 	return ret;
 }

 static int adt7x10_hyst_read(struct adt7x10_data *data, int index, long *val)
 {
 	int hyst, temp, ret;

 	mutex_lock(&data->update_lock);
 	ret = regmap_read(data->regmap, ADT7X10_T_HYST, &hyst);
 	if (ret) {
 		mutex_unlock(&data->update_lock);
 		return ret;
 	}

 	ret = regmap_read(data->regmap, ADT7X10_REG_TEMP[index], &temp);
 	mutex_unlock(&data->update_lock);
 	if (ret)
 		return ret;

 	hyst = (hyst & ADT7X10_T_HYST_MASK) * 1000;

 	/*
 	 * hysteresis is stored as a 4 bit offset in the device, convert it
 	 * to an absolute value
 	 */
 	/* min has positive offset, others have negative */
 	if (index == adt7x10_t_alarm_low)
 		hyst = -hyst;

 	*val = ADT7X10_REG_TO_TEMP(data, temp) - hyst;
 	return 0;
 }

 static int adt7x10_hyst_write(struct adt7x10_data *data, long hyst)
 {
 	unsigned int regval;
 	int limit, ret;

 	mutex_lock(&data->update_lock);

 	/* convert absolute hysteresis value to a 4 bit delta value */
 	ret = regmap_read(data->regmap, ADT7X10_T_ALARM_HIGH, &regval);
 	if (ret < 0)
 		goto abort;

 	limit = ADT7X10_REG_TO_TEMP(data, regval);

 	hyst = clamp_val(hyst, ADT7X10_TEMP_MIN, ADT7X10_TEMP_MAX);
 	regval = clamp_val(DIV_ROUND_CLOSEST(limit - hyst, 1000), 0,
 			   ADT7X10_T_HYST_MASK);
 	ret = regmap_write(data->regmap, ADT7X10_T_HYST, regval);
 abort:
 	mutex_unlock(&data->update_lock);
 	return ret;
 }

 static int adt7x10_alarm_read(struct adt7x10_data *data, int index, long *val)
 {
 	unsigned int status;
 	int ret;

 	ret = regmap_read(data->regmap, ADT7X10_STATUS, &status);
 	if (ret < 0)
 		return ret;

 	*val = !!(status & index);

 	return 0;
 }

 static umode_t adt7x10_is_visible(const void *data,
 				  enum hwmon_sensor_types type,
 				  u32 attr, int channel)
 {
 	switch (attr) {
 	case hwmon_temp_max:
 	case hwmon_temp_min:
 	case hwmon_temp_crit:
 	case hwmon_temp_max_hyst:
 		return 0644;
 	case hwmon_temp_input:
 	case hwmon_temp_min_alarm:
 	case hwmon_temp_max_alarm:
 	case hwmon_temp_crit_alarm:
 	case hwmon_temp_min_hyst:
 	case hwmon_temp_crit_hyst:
 		return 0444;
 	default:
 		break;
 	}

 	return 0;
 }

 static int adt7x10_read(struct device *dev, enum hwmon_sensor_types type,
 			u32 attr, int channel, long *val)
 {
 	struct adt7x10_data *data = dev_get_drvdata(dev);

 	switch (attr) {
 	case hwmon_temp_input:
 		return adt7x10_temp_read(data, adt7x10_temperature, val);
 	case hwmon_temp_max:
 		return adt7x10_temp_read(data, adt7x10_t_alarm_high, val);
 	case hwmon_temp_min:
 		return adt7x10_temp_read(data, adt7x10_t_alarm_low, val);
 	case hwmon_temp_crit:
 		return adt7x10_temp_read(data, adt7x10_t_crit, val);
 	case hwmon_temp_max_hyst:
 		return adt7x10_hyst_read(data, adt7x10_t_alarm_high, val);
 	case hwmon_temp_min_hyst:
 		return adt7x10_hyst_read(data, adt7x10_t_alarm_low, val);
 	case hwmon_temp_crit_hyst:
 		return adt7x10_hyst_read(data, adt7x10_t_crit, val);
 	case hwmon_temp_min_alarm:
 		return adt7x10_alarm_read(data, ADT7X10_STAT_T_LOW, val);
 	case hwmon_temp_max_alarm:
 		return adt7x10_alarm_read(data, ADT7X10_STAT_T_HIGH, val);
 	case hwmon_temp_crit_alarm:
 		return adt7x10_alarm_read(data, ADT7X10_STAT_T_CRIT, val);
 	default:
 		return -EOPNOTSUPP;
 	}
 }

 static int adt7x10_write(struct device *dev, enum hwmon_sensor_types type,
 			 u32 attr, int channel, long val)
 {
 	struct adt7x10_data *data = dev_get_drvdata(dev);

 	switch (attr) {
 	case hwmon_temp_max:
 		return adt7x10_temp_write(data, adt7x10_t_alarm_high, val);
 	case hwmon_temp_min:
 		return adt7x10_temp_write(data, adt7x10_t_alarm_low, val);
 	case hwmon_temp_crit:
 		return adt7x10_temp_write(data, adt7x10_t_crit, val);
 	case hwmon_temp_max_hyst:
 		return adt7x10_hyst_write(data, val);
 	default:
 		return -EOPNOTSUPP;
 	}
 }

 static const struct hwmon_channel_info *adt7x10_info[] = {
 	HWMON_CHANNEL_INFO(temp, HWMON_T_INPUT | HWMON_T_MAX | HWMON_T_MIN |
 			   HWMON_T_CRIT | HWMON_T_MAX_HYST | HWMON_T_MIN_HYST |
 			   HWMON_T_CRIT_HYST | HWMON_T_MIN_ALARM |
 			   HWMON_T_MAX_ALARM | HWMON_T_CRIT_ALARM),
 	NULL,
 };

 static const struct hwmon_ops adt7x10_hwmon_ops = {
 	.is_visible = adt7x10_is_visible,
 	.read = adt7x10_read,
 	.write = adt7x10_write,
 };

 static const struct hwmon_chip_info adt7x10_chip_info = {
 	.ops = &adt7x10_hwmon_ops,
 	.info = adt7x10_info,
 };

 static void adt7x10_restore_config(void *private)
 {
 	struct adt7x10_data *data = private;

 	regmap_write(data->regmap, ADT7X10_CONFIG, data->oldconfig);
 }

 int adt7x10_probe(struct device *dev, const char *name, int irq,
 		  struct regmap *regmap)
 {
 	struct adt7x10_data *data;
 	unsigned int config;
 	struct device *hdev;
 	int ret;

 	data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
 	if (!data)
 		return -ENOMEM;

 	data->regmap = regmap;

 	dev_set_drvdata(dev, data);
 	mutex_init(&data->update_lock);

 	/* configure as specified */
 	ret = regmap_read(regmap, ADT7X10_CONFIG, &config);
 	if (ret < 0) {
 		dev_dbg(dev, "Can't read config? %d\n", ret);
 		return ret;
 	}
 	data->oldconfig = config;

 	/*
 	 * Set to 16 bit resolution, continous conversion and comparator mode.
 	 */
 	data->config = data->oldconfig;
 	data->config &= ~(ADT7X10_MODE_MASK | ADT7X10_CT_POLARITY |
 			ADT7X10_INT_POLARITY);
 	data->config |= ADT7X10_FULL | ADT7X10_RESOLUTION | ADT7X10_EVENT_MODE;

 	if (data->config != data->oldconfig) {
 		ret = regmap_write(regmap, ADT7X10_CONFIG, data->config);
 		if (ret)
 			return ret;
 		ret = devm_add_action_or_reset(dev, adt7x10_restore_config, data);
 		if (ret)
 			return ret;
 	}
 	dev_dbg(dev, "Config %02x\n", data->config);

 	hdev = devm_hwmon_device_register_with_info(dev, name, data,
 						    &adt7x10_chip_info, NULL);
 	if (IS_ERR(hdev))
 		return PTR_ERR(hdev);

 	if (irq > 0) {
 		ret = devm_request_threaded_irq(dev, irq, NULL,
 						adt7x10_irq_handler,
 						IRQF_TRIGGER_FALLING |
 						IRQF_ONESHOT,
 						dev_name(dev), hdev);
 		if (ret)
 			return ret;
 	}

 	return 0;
 }
 EXPORT_SYMBOL_GPL(adt7x10_probe);

 #ifdef CONFIG_PM_SLEEP

 static int adt7x10_suspend(struct device *dev)
 {
 	struct adt7x10_data *data = dev_get_drvdata(dev);

 	return regmap_write(data->regmap, ADT7X10_CONFIG,
 			    data->config | ADT7X10_PD);
 }

 static int adt7x10_resume(struct device *dev)
 {
 	struct adt7x10_data *data = dev_get_drvdata(dev);

 	return regmap_write(data->regmap, ADT7X10_CONFIG, data->config);
 }

 SIMPLE_DEV_PM_OPS(adt7x10_dev_pm_ops, adt7x10_suspend, adt7x10_resume);
 EXPORT_SYMBOL_GPL(adt7x10_dev_pm_ops);

 #endif /* CONFIG_PM_SLEEP */

 MODULE_AUTHOR("Hartmut Knaack");
 MODULE_DESCRIPTION("ADT7410/ADT7420, ADT7310/ADT7320 common code");
 MODULE_LICENSE("GPL");
	// SPDX-License-Identifier: GPL-2.0-or-later
	/*
	* adt7x10.c - Part of lm_sensors, Linux kernel modules for hardware
	* monitoring
	* This driver handles the ADT7410 and compatible digital temperature sensors.
	* Hartmut Knaack <knaack.h@gmx.de> 2012-07-22
	* based on lm75.c by Frodo Looijaard <frodol@dds.nl>
	* and adt7410.c from iio-staging by Sonic Zhang <sonic.zhang@analog.com>
	*/

	#include <linux/device.h>
	#include <linux/module.h>
	#include <linux/init.h>
	#include <linux/slab.h>
	#include <linux/jiffies.h>
	#include <linux/hwmon.h>
	#include <linux/err.h>
	#include <linux/mutex.h>
	#include <linux/delay.h>
	#include <linux/interrupt.h>
	#include <linux/regmap.h>

	#include "adt7x10.h"

	/*
	* ADT7X10 status
	*/
	#define ADT7X10_STAT_T_LOW (1 << 4)
	#define ADT7X10_STAT_T_HIGH (1 << 5)
	#define ADT7X10_STAT_T_CRIT (1 << 6)
	#define ADT7X10_STAT_NOT_RDY (1 << 7)

	/*
	* ADT7X10 config
	*/
	#define ADT7X10_FAULT_QUEUE_MASK (1 << 0 \| 1 << 1)
	#define ADT7X10_CT_POLARITY (1 << 2)
	#define ADT7X10_INT_POLARITY (1 << 3)
	#define ADT7X10_EVENT_MODE (1 << 4)
	#define ADT7X10_MODE_MASK (1 << 5 \| 1 << 6)
	#define ADT7X10_FULL (0 << 5 \| 0 << 6)
	#define ADT7X10_PD (1 << 5 \| 1 << 6)
	#define ADT7X10_RESOLUTION (1 << 7)

	/*
	* ADT7X10 masks
	*/
	#define ADT7X10_T13_VALUE_MASK 0xFFF8
	#define ADT7X10_T_HYST_MASK 0xF

	/* straight from the datasheet */
	#define ADT7X10_TEMP_MIN (-55000)
	#define ADT7X10_TEMP_MAX 150000

	/* Each client has this additional data */
	struct adt7x10_data {
	struct regmap *regmap;
	struct mutex update_lock;
	u8 config;
	u8 oldconfig;
	bool valid; /* true if temperature valid */
	};

	enum {
	adt7x10_temperature = 0,
	adt7x10_t_alarm_high,
	adt7x10_t_alarm_low,
	adt7x10_t_crit,
	};

	static const u8 ADT7X10_REG_TEMP[] = {
	[adt7x10_temperature] = ADT7X10_TEMPERATURE, /* input */
	[adt7x10_t_alarm_high] = ADT7X10_T_ALARM_HIGH, /* high */
	[adt7x10_t_alarm_low] = ADT7X10_T_ALARM_LOW, /* low */
	[adt7x10_t_crit] = ADT7X10_T_CRIT, /* critical */
	};

	static irqreturn_t adt7x10_irq_handler(int irq, void *private)
	{
	struct device *dev = private;
	struct adt7x10_data *d = dev_get_drvdata(dev);
	unsigned int status;
	int ret;

	ret = regmap_read(d->regmap, ADT7X10_STATUS, &status);
	if (ret < 0)
	return IRQ_HANDLED;

	if (status & ADT7X10_STAT_T_HIGH)
	hwmon_notify_event(dev, hwmon_temp, hwmon_temp_max_alarm, 0);
	if (status & ADT7X10_STAT_T_LOW)
	hwmon_notify_event(dev, hwmon_temp, hwmon_temp_min_alarm, 0);
	if (status & ADT7X10_STAT_T_CRIT)
	hwmon_notify_event(dev, hwmon_temp, hwmon_temp_crit_alarm, 0);

	return IRQ_HANDLED;
	}

	static int adt7x10_temp_ready(struct regmap *regmap)
	{
	unsigned int status;
	int i, ret;

	for (i = 0; i < 6; i++) {
	ret = regmap_read(regmap, ADT7X10_STATUS, &status);
	if (ret < 0)
	return ret;
	if (!(status & ADT7X10_STAT_NOT_RDY))
	return 0;
	msleep(60);
	}
	return -ETIMEDOUT;
	}

	static s16 ADT7X10_TEMP_TO_REG(long temp)
	{
	return DIV_ROUND_CLOSEST(clamp_val(temp, ADT7X10_TEMP_MIN,
	ADT7X10_TEMP_MAX) * 128, 1000);
	}

	static int ADT7X10_REG_TO_TEMP(struct adt7x10_data *data, s16 reg)
	{
	/* in 13 bit mode, bits 0-2 are status flags - mask them out */
	if (!(data->config & ADT7X10_RESOLUTION))
	reg &= ADT7X10_T13_VALUE_MASK;
	/*
	* temperature is stored in twos complement format, in steps of
	* 1/128°C
	*/
	return DIV_ROUND_CLOSEST(reg * 1000, 128);
	}

	/-----------------------------------------------------------------------/

	static int adt7x10_temp_read(struct adt7x10_data data, int index, long val)
	{
	unsigned int regval;
	int ret;

	mutex_lock(&data->update_lock);
	if (index == adt7x10_temperature && !data->valid) {
	/* wait for valid temperature */
	ret = adt7x10_temp_ready(data->regmap);
	if (ret) {
	mutex_unlock(&data->update_lock);
	return ret;
	}
	data->valid = true;
	}
	mutex_unlock(&data->update_lock);

	ret = regmap_read(data->regmap, ADT7X10_REG_TEMP[index], &regval);
	if (ret)
	return ret;

	*val = ADT7X10_REG_TO_TEMP(data, regval);
	return 0;
	}

	static int adt7x10_temp_write(struct adt7x10_data *data, int index, long temp)
	{
	int ret;

	mutex_lock(&data->update_lock);
	ret = regmap_write(data->regmap, ADT7X10_REG_TEMP[index],
	ADT7X10_TEMP_TO_REG(temp));
	mutex_unlock(&data->update_lock);
	return ret;
	}

	static int adt7x10_hyst_read(struct adt7x10_data data, int index, long val)
	{
	int hyst, temp, ret;

	mutex_lock(&data->update_lock);
	ret = regmap_read(data->regmap, ADT7X10_T_HYST, &hyst);
	if (ret) {
	mutex_unlock(&data->update_lock);
	return ret;
	}

	ret = regmap_read(data->regmap, ADT7X10_REG_TEMP[index], &temp);
	mutex_unlock(&data->update_lock);
	if (ret)
	return ret;

	hyst = (hyst & ADT7X10_T_HYST_MASK) * 1000;

	/*
	* hysteresis is stored as a 4 bit offset in the device, convert it
	* to an absolute value
	*/
	/* min has positive offset, others have negative */
	if (index == adt7x10_t_alarm_low)
	hyst = -hyst;

	*val = ADT7X10_REG_TO_TEMP(data, temp) - hyst;
	return 0;
	}

	static int adt7x10_hyst_write(struct adt7x10_data *data, long hyst)
	{
	unsigned int regval;
	int limit, ret;

	mutex_lock(&data->update_lock);

	/* convert absolute hysteresis value to a 4 bit delta value */
	ret = regmap_read(data->regmap, ADT7X10_T_ALARM_HIGH, &regval);
	if (ret < 0)
	goto abort;

	limit = ADT7X10_REG_TO_TEMP(data, regval);

	hyst = clamp_val(hyst, ADT7X10_TEMP_MIN, ADT7X10_TEMP_MAX);
	regval = clamp_val(DIV_ROUND_CLOSEST(limit - hyst, 1000), 0,
	ADT7X10_T_HYST_MASK);
	ret = regmap_write(data->regmap, ADT7X10_T_HYST, regval);
	abort:
	mutex_unlock(&data->update_lock);
	return ret;
	}

	static int adt7x10_alarm_read(struct adt7x10_data data, int index, long val)
	{
	unsigned int status;
	int ret;

	ret = regmap_read(data->regmap, ADT7X10_STATUS, &status);
	if (ret < 0)
	return ret;

	*val = !!(status & index);

	return 0;
	}

	static umode_t adt7x10_is_visible(const void *data,
	enum hwmon_sensor_types type,
	u32 attr, int channel)
	{
	switch (attr) {
	case hwmon_temp_max:
	case hwmon_temp_min:
	case hwmon_temp_crit:
	case hwmon_temp_max_hyst:
	return 0644;
	case hwmon_temp_input:
	case hwmon_temp_min_alarm:
	case hwmon_temp_max_alarm:
	case hwmon_temp_crit_alarm:
	case hwmon_temp_min_hyst:
	case hwmon_temp_crit_hyst:
	return 0444;
	default:
	break;
	}

	return 0;
	}

	static int adt7x10_read(struct device *dev, enum hwmon_sensor_types type,
	u32 attr, int channel, long *val)
	{
	struct adt7x10_data *data = dev_get_drvdata(dev);

	switch (attr) {
	case hwmon_temp_input:
	return adt7x10_temp_read(data, adt7x10_temperature, val);
	case hwmon_temp_max:
	return adt7x10_temp_read(data, adt7x10_t_alarm_high, val);
	case hwmon_temp_min:
	return adt7x10_temp_read(data, adt7x10_t_alarm_low, val);
	case hwmon_temp_crit:
	return adt7x10_temp_read(data, adt7x10_t_crit, val);
	case hwmon_temp_max_hyst:
	return adt7x10_hyst_read(data, adt7x10_t_alarm_high, val);
	case hwmon_temp_min_hyst:
	return adt7x10_hyst_read(data, adt7x10_t_alarm_low, val);
	case hwmon_temp_crit_hyst:
	return adt7x10_hyst_read(data, adt7x10_t_crit, val);
	case hwmon_temp_min_alarm:
	return adt7x10_alarm_read(data, ADT7X10_STAT_T_LOW, val);
	case hwmon_temp_max_alarm:
	return adt7x10_alarm_read(data, ADT7X10_STAT_T_HIGH, val);
	case hwmon_temp_crit_alarm:
	return adt7x10_alarm_read(data, ADT7X10_STAT_T_CRIT, val);
	default:
	return -EOPNOTSUPP;
	}
	}

	static int adt7x10_write(struct device *dev, enum hwmon_sensor_types type,
	u32 attr, int channel, long val)
	{
	struct adt7x10_data *data = dev_get_drvdata(dev);

	switch (attr) {
	case hwmon_temp_max:
	return adt7x10_temp_write(data, adt7x10_t_alarm_high, val);
	case hwmon_temp_min:
	return adt7x10_temp_write(data, adt7x10_t_alarm_low, val);
	case hwmon_temp_crit:
	return adt7x10_temp_write(data, adt7x10_t_crit, val);
	case hwmon_temp_max_hyst:
	return adt7x10_hyst_write(data, val);
	default:
	return -EOPNOTSUPP;
	}
	}

	static const struct hwmon_channel_info *adt7x10_info[] = {
	HWMON_CHANNEL_INFO(temp, HWMON_T_INPUT \| HWMON_T_MAX \| HWMON_T_MIN \|
	HWMON_T_CRIT \| HWMON_T_MAX_HYST \| HWMON_T_MIN_HYST \|
	HWMON_T_CRIT_HYST \| HWMON_T_MIN_ALARM \|
	HWMON_T_MAX_ALARM \| HWMON_T_CRIT_ALARM),
	NULL,
	};

	static const struct hwmon_ops adt7x10_hwmon_ops = {
	.is_visible = adt7x10_is_visible,
	.read = adt7x10_read,
	.write = adt7x10_write,
	};

	static const struct hwmon_chip_info adt7x10_chip_info = {
	.ops = &adt7x10_hwmon_ops,
	.info = adt7x10_info,
	};

	static void adt7x10_restore_config(void *private)
	{
	struct adt7x10_data *data = private;

	regmap_write(data->regmap, ADT7X10_CONFIG, data->oldconfig);
	}

	int adt7x10_probe(struct device dev, const char name, int irq,
	struct regmap *regmap)
	{
	struct adt7x10_data *data;
	unsigned int config;
	struct device *hdev;
	int ret;

	data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
	if (!data)
	return -ENOMEM;

	data->regmap = regmap;

	dev_set_drvdata(dev, data);
	mutex_init(&data->update_lock);

	/* configure as specified */
	ret = regmap_read(regmap, ADT7X10_CONFIG, &config);
	if (ret < 0) {
	dev_dbg(dev, "Can't read config? %d\n", ret);
	return ret;
	}
	data->oldconfig = config;

	/*
	* Set to 16 bit resolution, continous conversion and comparator mode.
	*/
	data->config = data->oldconfig;
	data->config &= ~(ADT7X10_MODE_MASK \| ADT7X10_CT_POLARITY \|
	ADT7X10_INT_POLARITY);
	data->config \|= ADT7X10_FULL \| ADT7X10_RESOLUTION \| ADT7X10_EVENT_MODE;

	if (data->config != data->oldconfig) {
	ret = regmap_write(regmap, ADT7X10_CONFIG, data->config);
	if (ret)
	return ret;
	ret = devm_add_action_or_reset(dev, adt7x10_restore_config, data);
	if (ret)
	return ret;
	}
	dev_dbg(dev, "Config %02x\n", data->config);

	hdev = devm_hwmon_device_register_with_info(dev, name, data,
	&adt7x10_chip_info, NULL);
	if (IS_ERR(hdev))
	return PTR_ERR(hdev);

	if (irq > 0) {
	ret = devm_request_threaded_irq(dev, irq, NULL,
	adt7x10_irq_handler,
	IRQF_TRIGGER_FALLING \|
	IRQF_ONESHOT,
	dev_name(dev), hdev);
	if (ret)
	return ret;
	}

	return 0;
	}
	EXPORT_SYMBOL_GPL(adt7x10_probe);

	#ifdef CONFIG_PM_SLEEP

	static int adt7x10_suspend(struct device *dev)
	{
	struct adt7x10_data *data = dev_get_drvdata(dev);

	return regmap_write(data->regmap, ADT7X10_CONFIG,
	data->config \| ADT7X10_PD);
	}

	static int adt7x10_resume(struct device *dev)
	{
	struct adt7x10_data *data = dev_get_drvdata(dev);

	return regmap_write(data->regmap, ADT7X10_CONFIG, data->config);
	}

	SIMPLE_DEV_PM_OPS(adt7x10_dev_pm_ops, adt7x10_suspend, adt7x10_resume);
	EXPORT_SYMBOL_GPL(adt7x10_dev_pm_ops);

	#endif /* CONFIG_PM_SLEEP */

	MODULE_AUTHOR("Hartmut Knaack");
	MODULE_DESCRIPTION("ADT7410/ADT7420, ADT7310/ADT7320 common code");
	MODULE_LICENSE("GPL");