[linux-2.6-block.git] / drivers / hwmon / adt7410.c

/*
 * adt7410.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>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 */

#include <linux/module.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/jiffies.h>
#include <linux/i2c.h>
#include <linux/hwmon.h>
#include <linux/hwmon-sysfs.h>
#include <linux/err.h>
#include <linux/mutex.h>
#include <linux/delay.h>

/*
 * ADT7410 registers definition
 */

#define ADT7410_TEMPERATURE		0
#define ADT7410_STATUS			2
#define ADT7410_CONFIG			3
#define ADT7410_T_ALARM_HIGH		4
#define ADT7410_T_ALARM_LOW		6
#define ADT7410_T_CRIT			8
#define ADT7410_T_HYST			0xA

/*
 * ADT7410 status
 */
#define ADT7410_STAT_T_LOW		(1 << 4)
#define ADT7410_STAT_T_HIGH		(1 << 5)
#define ADT7410_STAT_T_CRIT		(1 << 6)
#define ADT7410_STAT_NOT_RDY		(1 << 7)

/*
 * ADT7410 config
 */
#define ADT7410_FAULT_QUEUE_MASK	(1 << 0 | 1 << 1)
#define ADT7410_CT_POLARITY		(1 << 2)
#define ADT7410_INT_POLARITY		(1 << 3)
#define ADT7410_EVENT_MODE		(1 << 4)
#define ADT7410_MODE_MASK		(1 << 5 | 1 << 6)
#define ADT7410_FULL			(0 << 5 | 0 << 6)
#define ADT7410_PD			(1 << 5 | 1 << 6)
#define ADT7410_RESOLUTION		(1 << 7)

/*
 * ADT7410 masks
 */
#define ADT7410_T13_VALUE_MASK			0xFFF8
#define ADT7410_T_HYST_MASK			0xF

/* straight from the datasheet */
#define ADT7410_TEMP_MIN (-55000)
#define ADT7410_TEMP_MAX 150000

enum adt7410_type {		/* keep sorted in alphabetical order */
	adt7410,
};

static const u8 ADT7410_REG_TEMP[4] = {
	ADT7410_TEMPERATURE,		/* input */
	ADT7410_T_ALARM_HIGH,		/* high */
	ADT7410_T_ALARM_LOW,		/* low */
	ADT7410_T_CRIT,			/* critical */
};

/* Each client has this additional data */
struct adt7410_data {
	struct device		*hwmon_dev;
	struct mutex		update_lock;
	u8			config;
	u8			oldconfig;
	bool			valid;		/* true if registers valid */
	unsigned long		last_updated;	/* In jiffies */
	s16			temp[4];	/* Register values,
						   0 = input
						   1 = high
						   2 = low
						   3 = critical */
	u8			hyst;		/* hysteresis offset */
};

/*
 * adt7410 register access by I2C
 */
static int adt7410_temp_ready(struct i2c_client *client)
{
	int i, status;

	for (i = 0; i < 6; i++) {
		status = i2c_smbus_read_byte_data(client, ADT7410_STATUS);
		if (status < 0)
			return status;
		if (!(status & ADT7410_STAT_NOT_RDY))
			return 0;
		msleep(60);
	}
	return -ETIMEDOUT;
}

static struct adt7410_data *adt7410_update_device(struct device *dev)
{
	struct i2c_client *client = to_i2c_client(dev);
	struct adt7410_data *data = i2c_get_clientdata(client);
	struct adt7410_data *ret = data;
	mutex_lock(&data->update_lock);

	if (time_after(jiffies, data->last_updated + HZ + HZ / 2)
	    || !data->valid) {
		int i, status;

		dev_dbg(&client->dev, "Starting update\n");

		status = adt7410_temp_ready(client); /* check for new value */
		if (unlikely(status)) {
			ret = ERR_PTR(status);
			goto abort;
		}
		for (i = 0; i < ARRAY_SIZE(data->temp); i++) {
			status = i2c_smbus_read_word_swapped(client,
							ADT7410_REG_TEMP[i]);
			if (unlikely(status < 0)) {
				dev_dbg(dev,
					"Failed to read value: reg %d, error %d\n",
					ADT7410_REG_TEMP[i], status);
				ret = ERR_PTR(status);
				goto abort;
			}
			data->temp[i] = status;
		}
		status = i2c_smbus_read_byte_data(client, ADT7410_T_HYST);
		if (unlikely(status < 0)) {
			dev_dbg(dev,
				"Failed to read value: reg %d, error %d\n",
				ADT7410_T_HYST, status);
			ret = ERR_PTR(status);
			goto abort;
		}
		data->hyst = status;
		data->last_updated = jiffies;
		data->valid = true;
	}

abort:
	mutex_unlock(&data->update_lock);
	return ret;
}

static s16 ADT7410_TEMP_TO_REG(long temp)
{
	return DIV_ROUND_CLOSEST(clamp_val(temp, ADT7410_TEMP_MIN,
					   ADT7410_TEMP_MAX) * 128, 1000);
}

static int ADT7410_REG_TO_TEMP(struct adt7410_data *data, s16 reg)
{
	/* in 13 bit mode, bits 0-2 are status flags - mask them out */
	if (!(data->config & ADT7410_RESOLUTION))
		reg &= ADT7410_T13_VALUE_MASK;
	/*
	 * temperature is stored in twos complement format, in steps of
	 * 1/128°C
	 */
	return DIV_ROUND_CLOSEST(reg * 1000, 128);
}

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

/* sysfs attributes for hwmon */

static ssize_t adt7410_show_temp(struct device *dev,
				 struct device_attribute *da, char *buf)
{
	struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
	struct adt7410_data *data = adt7410_update_device(dev);

	if (IS_ERR(data))
		return PTR_ERR(data);

	return sprintf(buf, "%d\n", ADT7410_REG_TO_TEMP(data,
		       data->temp[attr->index]));
}

static ssize_t adt7410_set_temp(struct device *dev,
				struct device_attribute *da,
				const char *buf, size_t count)
{
	struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
	struct i2c_client *client = to_i2c_client(dev);
	struct adt7410_data *data = i2c_get_clientdata(client);
	int nr = attr->index;
	long temp;
	int ret;

	ret = kstrtol(buf, 10, &temp);
	if (ret)
		return ret;

	mutex_lock(&data->update_lock);
	data->temp[nr] = ADT7410_TEMP_TO_REG(temp);
	ret = i2c_smbus_write_word_swapped(client, ADT7410_REG_TEMP[nr],
					   data->temp[nr]);
	if (ret)
		count = ret;
	mutex_unlock(&data->update_lock);
	return count;
}

static ssize_t adt7410_show_t_hyst(struct device *dev,
				   struct device_attribute *da,
				   char *buf)
{
	struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
	struct adt7410_data *data;
	int nr = attr->index;
	int hyst;

	data = adt7410_update_device(dev);
	if (IS_ERR(data))
		return PTR_ERR(data);
	hyst = (data->hyst & ADT7410_T_HYST_MASK) * 1000;

	/*
	 * hysteresis is stored as a 4 bit offset in the device, convert it
	 * to an absolute value
	 */
	if (nr == 2)	/* min has positive offset, others have negative */
		hyst = -hyst;
	return sprintf(buf, "%d\n",
		       ADT7410_REG_TO_TEMP(data, data->temp[nr]) - hyst);
}

static ssize_t adt7410_set_t_hyst(struct device *dev,
				  struct device_attribute *da,
				  const char *buf, size_t count)
{
	struct i2c_client *client = to_i2c_client(dev);
	struct adt7410_data *data = i2c_get_clientdata(client);
	int limit, ret;
	long hyst;

	ret = kstrtol(buf, 10, &hyst);
	if (ret)
		return ret;
	/* convert absolute hysteresis value to a 4 bit delta value */
	limit = ADT7410_REG_TO_TEMP(data, data->temp[1]);
	hyst = clamp_val(hyst, ADT7410_TEMP_MIN, ADT7410_TEMP_MAX);
	data->hyst = clamp_val(DIV_ROUND_CLOSEST(limit - hyst, 1000), 0,
			       ADT7410_T_HYST_MASK);
	ret = i2c_smbus_write_byte_data(client, ADT7410_T_HYST, data->hyst);
	if (ret)
		return ret;

	return count;
}

static ssize_t adt7410_show_alarm(struct device *dev,
				  struct device_attribute *da,
				  char *buf)
{
	struct i2c_client *client = to_i2c_client(dev);
	struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
	int ret;

	ret = i2c_smbus_read_byte_data(client, ADT7410_STATUS);
	if (ret < 0)
		return ret;

	return sprintf(buf, "%d\n", !!(ret & attr->index));
}

static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, adt7410_show_temp, NULL, 0);
static SENSOR_DEVICE_ATTR(temp1_max, S_IWUSR | S_IRUGO,
			  adt7410_show_temp, adt7410_set_temp, 1);
static SENSOR_DEVICE_ATTR(temp1_min, S_IWUSR | S_IRUGO,
			  adt7410_show_temp, adt7410_set_temp, 2);
static SENSOR_DEVICE_ATTR(temp1_crit, S_IWUSR | S_IRUGO,
			  adt7410_show_temp, adt7410_set_temp, 3);
static SENSOR_DEVICE_ATTR(temp1_max_hyst, S_IWUSR | S_IRUGO,
			  adt7410_show_t_hyst, adt7410_set_t_hyst, 1);
static SENSOR_DEVICE_ATTR(temp1_min_hyst, S_IRUGO,
			  adt7410_show_t_hyst, NULL, 2);
static SENSOR_DEVICE_ATTR(temp1_crit_hyst, S_IRUGO,
			  adt7410_show_t_hyst, NULL, 3);
static SENSOR_DEVICE_ATTR(temp1_min_alarm, S_IRUGO, adt7410_show_alarm,
			  NULL, ADT7410_STAT_T_LOW);
static SENSOR_DEVICE_ATTR(temp1_max_alarm, S_IRUGO, adt7410_show_alarm,
			  NULL, ADT7410_STAT_T_HIGH);
static SENSOR_DEVICE_ATTR(temp1_crit_alarm, S_IRUGO, adt7410_show_alarm,
			  NULL, ADT7410_STAT_T_CRIT);

static struct attribute *adt7410_attributes[] = {
	&sensor_dev_attr_temp1_input.dev_attr.attr,
	&sensor_dev_attr_temp1_max.dev_attr.attr,
	&sensor_dev_attr_temp1_min.dev_attr.attr,
	&sensor_dev_attr_temp1_crit.dev_attr.attr,
	&sensor_dev_attr_temp1_max_hyst.dev_attr.attr,
	&sensor_dev_attr_temp1_min_hyst.dev_attr.attr,
	&sensor_dev_attr_temp1_crit_hyst.dev_attr.attr,
	&sensor_dev_attr_temp1_min_alarm.dev_attr.attr,
	&sensor_dev_attr_temp1_max_alarm.dev_attr.attr,
	&sensor_dev_attr_temp1_crit_alarm.dev_attr.attr,
	NULL
};

static const struct attribute_group adt7410_group = {
	.attrs = adt7410_attributes,
};

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

/* device probe and removal */

static int adt7410_probe(struct i2c_client *client,
			 const struct i2c_device_id *id)
{
	struct adt7410_data *data;
	int ret;

	if (!i2c_check_functionality(client->adapter,
			I2C_FUNC_SMBUS_BYTE_DATA | I2C_FUNC_SMBUS_WORD_DATA))
		return -ENODEV;

	data = devm_kzalloc(&client->dev, sizeof(struct adt7410_data),
			    GFP_KERNEL);
	if (!data)
		return -ENOMEM;

	i2c_set_clientdata(client, data);
	mutex_init(&data->update_lock);

	/* configure as specified */
	ret = i2c_smbus_read_byte_data(client, ADT7410_CONFIG);
	if (ret < 0) {
		dev_dbg(&client->dev, "Can't read config? %d\n", ret);
		return ret;
	}
	data->oldconfig = ret;
	/*
	 * Set to 16 bit resolution, continous conversion and comparator mode.
	 */
	ret &= ~ADT7410_MODE_MASK;
	data->config = ret | ADT7410_FULL | ADT7410_RESOLUTION |
			ADT7410_EVENT_MODE;
	if (data->config != data->oldconfig) {
		ret = i2c_smbus_write_byte_data(client, ADT7410_CONFIG,
						data->config);
		if (ret)
			return ret;
	}
	dev_dbg(&client->dev, "Config %02x\n", data->config);

	/* Register sysfs hooks */
	ret = sysfs_create_group(&client->dev.kobj, &adt7410_group);
	if (ret)
		goto exit_restore;

	data->hwmon_dev = hwmon_device_register(&client->dev);
	if (IS_ERR(data->hwmon_dev)) {
		ret = PTR_ERR(data->hwmon_dev);
		goto exit_remove;
	}

	dev_info(&client->dev, "sensor '%s'\n", client->name);

	return 0;

exit_remove:
	sysfs_remove_group(&client->dev.kobj, &adt7410_group);
exit_restore:
	i2c_smbus_write_byte_data(client, ADT7410_CONFIG, data->oldconfig);
	return ret;
}

static int adt7410_remove(struct i2c_client *client)
{
	struct adt7410_data *data = i2c_get_clientdata(client);

	hwmon_device_unregister(data->hwmon_dev);
	sysfs_remove_group(&client->dev.kobj, &adt7410_group);
	if (data->oldconfig != data->config)
		i2c_smbus_write_byte_data(client, ADT7410_CONFIG,
					  data->oldconfig);
	return 0;
}

static const struct i2c_device_id adt7410_ids[] = {
	{ "adt7410", adt7410, },
	{ "adt7420", adt7410, },
	{ /* LIST END */ }
};
MODULE_DEVICE_TABLE(i2c, adt7410_ids);

#ifdef CONFIG_PM_SLEEP
static int adt7410_suspend(struct device *dev)
{
	int ret;
	struct i2c_client *client = to_i2c_client(dev);
	struct adt7410_data *data = i2c_get_clientdata(client);

	ret = i2c_smbus_write_byte_data(client, ADT7410_CONFIG,
					data->config | ADT7410_PD);
	return ret;
}

static int adt7410_resume(struct device *dev)
{
	int ret;
	struct i2c_client *client = to_i2c_client(dev);
	struct adt7410_data *data = i2c_get_clientdata(client);

	ret = i2c_smbus_write_byte_data(client, ADT7410_CONFIG, data->config);
	return ret;
}

static SIMPLE_DEV_PM_OPS(adt7410_dev_pm_ops, adt7410_suspend, adt7410_resume);

#define ADT7410_DEV_PM_OPS (&adt7410_dev_pm_ops)
#else
#define ADT7410_DEV_PM_OPS NULL
#endif /* CONFIG_PM */

static struct i2c_driver adt7410_driver = {
	.class		= I2C_CLASS_HWMON,
	.driver = {
		.name	= "adt7410",
		.pm	= ADT7410_DEV_PM_OPS,
	},
	.probe		= adt7410_probe,
	.remove		= adt7410_remove,
	.id_table	= adt7410_ids,
	.address_list	= I2C_ADDRS(0x48, 0x49, 0x4a, 0x4b),
};

module_i2c_driver(adt7410_driver);

MODULE_AUTHOR("Hartmut Knaack");
MODULE_DESCRIPTION("ADT7410/ADT7420 driver");
MODULE_LICENSE("GPL");
Commit	Line	Data
983b97be HK	1	/*
	2	* adt7410.c - Part of lm_sensors, Linux kernel modules for hardware
	3	* monitoring
	4	* This driver handles the ADT7410 and compatible digital temperature sensors.
	5	* Hartmut Knaack <knaack.h@gmx.de> 2012-07-22
	6	* based on lm75.c by Frodo Looijaard <frodol@dds.nl>
	7	* and adt7410.c from iio-staging by Sonic Zhang <sonic.zhang@analog.com>
	8	*
	9	* This program is free software; you can redistribute it and/or modify
	10	* it under the terms of the GNU General Public License as published by
	11	* the Free Software Foundation; either version 2 of the License, or
	12	* (at your option) any later version.
	13	*
	14	* This program is distributed in the hope that it will be useful,
	15	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	16	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	17	* GNU General Public License for more details.
	18	*
	19	* You should have received a copy of the GNU General Public License
	20	* along with this program; if not, write to the Free Software
	21	* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
	22	*/
	23
	24	#include <linux/module.h>
	25	#include <linux/init.h>
	26	#include <linux/slab.h>
	27	#include <linux/jiffies.h>
	28	#include <linux/i2c.h>
	29	#include <linux/hwmon.h>
	30	#include <linux/hwmon-sysfs.h>
	31	#include <linux/err.h>
	32	#include <linux/mutex.h>
	33	#include <linux/delay.h>
	34
	35	/*
	36	* ADT7410 registers definition
	37	*/
	38
	39	#define ADT7410_TEMPERATURE 0
	40	#define ADT7410_STATUS 2
	41	#define ADT7410_CONFIG 3
	42	#define ADT7410_T_ALARM_HIGH 4
	43	#define ADT7410_T_ALARM_LOW 6
	44	#define ADT7410_T_CRIT 8
	45	#define ADT7410_T_HYST 0xA
	46
	47	/*
	48	* ADT7410 status
	49	*/
	50	#define ADT7410_STAT_T_LOW (1 << 4)
	51	#define ADT7410_STAT_T_HIGH (1 << 5)
	52	#define ADT7410_STAT_T_CRIT (1 << 6)
	53	#define ADT7410_STAT_NOT_RDY (1 << 7)
	54
	55	/*
	56	* ADT7410 config
	57	*/
	58	#define ADT7410_FAULT_QUEUE_MASK (1 << 0 \| 1 << 1)
	59	#define ADT7410_CT_POLARITY (1 << 2)
	60	#define ADT7410_INT_POLARITY (1 << 3)
	61	#define ADT7410_EVENT_MODE (1 << 4)
	62	#define ADT7410_MODE_MASK (1 << 5 \| 1 << 6)
	63	#define ADT7410_FULL (0 << 5 \| 0 << 6)
	64	#define ADT7410_PD (1 << 5 \| 1 << 6)
65	#define ADT7410_RESOLUTION (1 << 7)
66
67	/*
68	* ADT7410 masks
69	*/
70	#define ADT7410_T13_VALUE_MASK 0xFFF8
71	#define ADT7410_T_HYST_MASK 0xF
72
73	/* straight from the datasheet */
74	#define ADT7410_TEMP_MIN (-55000)
75	#define ADT7410_TEMP_MAX 150000
76
77	enum adt7410_type { /* keep sorted in alphabetical order */
78	adt7410,
79	};
80
983b97be HK	81	static const u8 ADT7410_REG_TEMP[4] = {
	82	ADT7410_TEMPERATURE, /* input */
	83	ADT7410_T_ALARM_HIGH, /* high */
	84	ADT7410_T_ALARM_LOW, /* low */
	85	ADT7410_T_CRIT, /* critical */
	86	};
	87
	88	/* Each client has this additional data */
	89	struct adt7410_data {
	90	struct device *hwmon_dev;
	91	struct mutex update_lock;
	92	u8 config;
	93	u8 oldconfig;
	94	bool valid; /* true if registers valid */
	95	unsigned long last_updated; /* In jiffies */
	96	s16 temp[4]; /* Register values,
	97	0 = input
	98	1 = high
	99	2 = low
	100	3 = critical */
	101	u8 hyst; /* hysteresis offset */
	102	};
	103
	104	/*
	105	* adt7410 register access by I2C
	106	*/
	107	static int adt7410_temp_ready(struct i2c_client *client)
	108	{
	109	int i, status;
	110
	111	for (i = 0; i < 6; i++) {
	112	status = i2c_smbus_read_byte_data(client, ADT7410_STATUS);
	113	if (status < 0)
	114	return status;
	115	if (!(status & ADT7410_STAT_NOT_RDY))
	116	return 0;
	117	msleep(60);
	118	}
	119	return -ETIMEDOUT;
	120	}
	121
	122	static struct adt7410_data adt7410_update_device(struct device dev)
	123	{
	124	struct i2c_client *client = to_i2c_client(dev);
	125	struct adt7410_data *data = i2c_get_clientdata(client);
	126	struct adt7410_data *ret = data;
	127	mutex_lock(&data->update_lock);
	128
	129	if (time_after(jiffies, data->last_updated + HZ + HZ / 2)
	130	\|\| !data->valid) {
	131	int i, status;
	132
	133	dev_dbg(&client->dev, "Starting update\n");
	134
	135	status = adt7410_temp_ready(client); /* check for new value */
	136	if (unlikely(status)) {
	137	ret = ERR_PTR(status);
	138	goto abort;
	139	}
	140	for (i = 0; i < ARRAY_SIZE(data->temp); i++) {
	141	status = i2c_smbus_read_word_swapped(client,
	142	ADT7410_REG_TEMP[i]);
	143	if (unlikely(status < 0)) {
	144	dev_dbg(dev,
145	"Failed to read value: reg %d, error %d\n",
146	ADT7410_REG_TEMP[i], status);
147	ret = ERR_PTR(status);
148	goto abort;
149	}
150	data->temp[i] = status;
151	}
152	status = i2c_smbus_read_byte_data(client, ADT7410_T_HYST);
153	if (unlikely(status < 0)) {
154	dev_dbg(dev,
155	"Failed to read value: reg %d, error %d\n",
156	ADT7410_T_HYST, status);
157	ret = ERR_PTR(status);
158	goto abort;
159	}
160	data->hyst = status;
161	data->last_updated = jiffies;
162	data->valid = true;
163	}
164
165	abort:
166	mutex_unlock(&data->update_lock);
167	return ret;
168	}
169
170	static s16 ADT7410_TEMP_TO_REG(long temp)
171	{
2a844c14 GR	172	return DIV_ROUND_CLOSEST(clamp_val(temp, ADT7410_TEMP_MIN,
2a844c14 GR	173	ADT7410_TEMP_MAX) * 128, 1000);
983b97be HK	174	}
	175
	176	static int ADT7410_REG_TO_TEMP(struct adt7410_data *data, s16 reg)
	177	{
	178	/* in 13 bit mode, bits 0-2 are status flags - mask them out */
	179	if (!(data->config & ADT7410_RESOLUTION))
	180	reg &= ADT7410_T13_VALUE_MASK;
	181	/*
	182	* temperature is stored in twos complement format, in steps of
	183	* 1/128°C
	184	*/
	185	return DIV_ROUND_CLOSEST(reg * 1000, 128);
	186	}
	187
	188	/-----------------------------------------------------------------------/
	189
	190	/* sysfs attributes for hwmon */
	191
	192	static ssize_t adt7410_show_temp(struct device *dev,
	193	struct device_attribute da, char buf)
	194	{
	195	struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
	196	struct adt7410_data *data = adt7410_update_device(dev);
	197
	198	if (IS_ERR(data))
	199	return PTR_ERR(data);
	200
	201	return sprintf(buf, "%d\n", ADT7410_REG_TO_TEMP(data,
	202	data->temp[attr->index]));
	203	}
	204
	205	static ssize_t adt7410_set_temp(struct device *dev,
	206	struct device_attribute *da,
	207	const char *buf, size_t count)
	208	{
	209	struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
	210	struct i2c_client *client = to_i2c_client(dev);
	211	struct adt7410_data *data = i2c_get_clientdata(client);
	212	int nr = attr->index;
	213	long temp;
	214	int ret;
	215
	216	ret = kstrtol(buf, 10, &temp);
	217	if (ret)
	218	return ret;
	219
	220	mutex_lock(&data->update_lock);
	221	data->temp[nr] = ADT7410_TEMP_TO_REG(temp);
	222	ret = i2c_smbus_write_word_swapped(client, ADT7410_REG_TEMP[nr],
	223	data->temp[nr]);
	224	if (ret)
	225	count = ret;
	226	mutex_unlock(&data->update_lock);
	227	return count;
	228	}
	229
	230	static ssize_t adt7410_show_t_hyst(struct device *dev,
	231	struct device_attribute *da,
	232	char *buf)
	233	{
	234	struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
37f9648b	235	struct adt7410_data *data;
983b97be	236	int nr = attr->index;
37f9648b DC	237	int hyst;
	238
	239	data = adt7410_update_device(dev);
	240	if (IS_ERR(data))
	241	return PTR_ERR(data);
	242	hyst = (data->hyst & ADT7410_T_HYST_MASK) * 1000;
983b97be HK	243
	244	/*
	245	* hysteresis is stored as a 4 bit offset in the device, convert it
	246	* to an absolute value
	247	*/
	248	if (nr == 2) /* min has positive offset, others have negative */
	249	hyst = -hyst;
	250	return sprintf(buf, "%d\n",
	251	ADT7410_REG_TO_TEMP(data, data->temp[nr]) - hyst);
	252	}
	253
	254	static ssize_t adt7410_set_t_hyst(struct device *dev,
	255	struct device_attribute *da,
	256	const char *buf, size_t count)
	257	{
	258	struct i2c_client *client = to_i2c_client(dev);
	259	struct adt7410_data *data = i2c_get_clientdata(client);
	260	int limit, ret;
	261	long hyst;
	262
	263	ret = kstrtol(buf, 10, &hyst);
	264	if (ret)
	265	return ret;
	266	/* convert absolute hysteresis value to a 4 bit delta value */
	267	limit = ADT7410_REG_TO_TEMP(data, data->temp[1]);
2a844c14 GR	268	hyst = clamp_val(hyst, ADT7410_TEMP_MIN, ADT7410_TEMP_MAX);
	269	data->hyst = clamp_val(DIV_ROUND_CLOSEST(limit - hyst, 1000), 0,
	270	ADT7410_T_HYST_MASK);
983b97be HK	271	ret = i2c_smbus_write_byte_data(client, ADT7410_T_HYST, data->hyst);
	272	if (ret)
	273	return ret;
	274
	275	return count;
	276	}
	277
	278	static ssize_t adt7410_show_alarm(struct device *dev,
	279	struct device_attribute *da,
	280	char *buf)
	281	{
	282	struct i2c_client *client = to_i2c_client(dev);
	283	struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
	284	int ret;
	285
	286	ret = i2c_smbus_read_byte_data(client, ADT7410_STATUS);
	287	if (ret < 0)
	288	return ret;
	289
	290	return sprintf(buf, "%d\n", !!(ret & attr->index));
	291	}
	292
	293	static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, adt7410_show_temp, NULL, 0);
	294	static SENSOR_DEVICE_ATTR(temp1_max, S_IWUSR \| S_IRUGO,
	295	adt7410_show_temp, adt7410_set_temp, 1);
	296	static SENSOR_DEVICE_ATTR(temp1_min, S_IWUSR \| S_IRUGO,
	297	adt7410_show_temp, adt7410_set_temp, 2);
	298	static SENSOR_DEVICE_ATTR(temp1_crit, S_IWUSR \| S_IRUGO,
	299	adt7410_show_temp, adt7410_set_temp, 3);
	300	static SENSOR_DEVICE_ATTR(temp1_max_hyst, S_IWUSR \| S_IRUGO,
	301	adt7410_show_t_hyst, adt7410_set_t_hyst, 1);
	302	static SENSOR_DEVICE_ATTR(temp1_min_hyst, S_IRUGO,
	303	adt7410_show_t_hyst, NULL, 2);
	304	static SENSOR_DEVICE_ATTR(temp1_crit_hyst, S_IRUGO,
	305	adt7410_show_t_hyst, NULL, 3);
	306	static SENSOR_DEVICE_ATTR(temp1_min_alarm, S_IRUGO, adt7410_show_alarm,
	307	NULL, ADT7410_STAT_T_LOW);
	308	static SENSOR_DEVICE_ATTR(temp1_max_alarm, S_IRUGO, adt7410_show_alarm,
	309	NULL, ADT7410_STAT_T_HIGH);
	310	static SENSOR_DEVICE_ATTR(temp1_crit_alarm, S_IRUGO, adt7410_show_alarm,
	311	NULL, ADT7410_STAT_T_CRIT);
	312
	313	static struct attribute *adt7410_attributes[] = {
	314	&sensor_dev_attr_temp1_input.dev_attr.attr,
	315	&sensor_dev_attr_temp1_max.dev_attr.attr,
	316	&sensor_dev_attr_temp1_min.dev_attr.attr,
	317	&sensor_dev_attr_temp1_crit.dev_attr.attr,
	318	&sensor_dev_attr_temp1_max_hyst.dev_attr.attr,
	319	&sensor_dev_attr_temp1_min_hyst.dev_attr.attr,
	320	&sensor_dev_attr_temp1_crit_hyst.dev_attr.attr,
	321	&sensor_dev_attr_temp1_min_alarm.dev_attr.attr,
	322	&sensor_dev_attr_temp1_max_alarm.dev_attr.attr,
	323	&sensor_dev_attr_temp1_crit_alarm.dev_attr.attr,
	324	NULL
	325	};
	326
	327	static const struct attribute_group adt7410_group = {
	328	.attrs = adt7410_attributes,
	329	};
	330
	331	/-----------------------------------------------------------------------/
	332
	333	/* device probe and removal */
	334
335	static int adt7410_probe(struct i2c_client *client,
336	const struct i2c_device_id *id)
337	{
338	struct adt7410_data *data;
339	int ret;
340
341	if (!i2c_check_functionality(client->adapter,
342	I2C_FUNC_SMBUS_BYTE_DATA \| I2C_FUNC_SMBUS_WORD_DATA))
343	return -ENODEV;
344
345	data = devm_kzalloc(&client->dev, sizeof(struct adt7410_data),
346	GFP_KERNEL);
347	if (!data)
348	return -ENOMEM;
349
350	i2c_set_clientdata(client, data);
351	mutex_init(&data->update_lock);
352
353	/* configure as specified */
354	ret = i2c_smbus_read_byte_data(client, ADT7410_CONFIG);
355	if (ret < 0) {
356	dev_dbg(&client->dev, "Can't read config? %d\n", ret);
357	return ret;
358	}
359	data->oldconfig = ret;
360	/*
361	* Set to 16 bit resolution, continous conversion and comparator mode.
362	*/
6e7d3b6b	363	ret &= ~ADT7410_MODE_MASK;
983b97be HK	364	data->config = ret \| ADT7410_FULL \| ADT7410_RESOLUTION \|
	365	ADT7410_EVENT_MODE;
	366	if (data->config != data->oldconfig) {
	367	ret = i2c_smbus_write_byte_data(client, ADT7410_CONFIG,
	368	data->config);
	369	if (ret)
	370	return ret;
	371	}
	372	dev_dbg(&client->dev, "Config %02x\n", data->config);
	373
	374	/* Register sysfs hooks */
	375	ret = sysfs_create_group(&client->dev.kobj, &adt7410_group);
	376	if (ret)
	377	goto exit_restore;
	378
	379	data->hwmon_dev = hwmon_device_register(&client->dev);
	380	if (IS_ERR(data->hwmon_dev)) {
	381	ret = PTR_ERR(data->hwmon_dev);
	382	goto exit_remove;
	383	}
	384
	385	dev_info(&client->dev, "sensor '%s'\n", client->name);
	386
	387	return 0;
	388
	389	exit_remove:
	390	sysfs_remove_group(&client->dev.kobj, &adt7410_group);
	391	exit_restore:
	392	i2c_smbus_write_byte_data(client, ADT7410_CONFIG, data->oldconfig);
	393	return ret;
	394	}
	395
	396	static int adt7410_remove(struct i2c_client *client)
	397	{
	398	struct adt7410_data *data = i2c_get_clientdata(client);
	399
	400	hwmon_device_unregister(data->hwmon_dev);
	401	sysfs_remove_group(&client->dev.kobj, &adt7410_group);
	402	if (data->oldconfig != data->config)
	403	i2c_smbus_write_byte_data(client, ADT7410_CONFIG,
	404	data->oldconfig);
	405	return 0;
	406	}
	407
	408	static const struct i2c_device_id adt7410_ids[] = {
	409	{ "adt7410", adt7410, },
e46e5dc2	410	{ "adt7420", adt7410, },
983b97be HK	411	{ /* LIST END */ }
	412	};
	413	MODULE_DEVICE_TABLE(i2c, adt7410_ids);
	414
e0db9c4b	415	#ifdef CONFIG_PM_SLEEP
983b97be HK	416	static int adt7410_suspend(struct device *dev)
	417	{
	418	int ret;
	419	struct i2c_client *client = to_i2c_client(dev);
	420	struct adt7410_data *data = i2c_get_clientdata(client);
	421
	422	ret = i2c_smbus_write_byte_data(client, ADT7410_CONFIG,
	423	data->config \| ADT7410_PD);
	424	return ret;
	425	}
	426
	427	static int adt7410_resume(struct device *dev)
	428	{
	429	int ret;
	430	struct i2c_client *client = to_i2c_client(dev);
	431	struct adt7410_data *data = i2c_get_clientdata(client);
	432
	433	ret = i2c_smbus_write_byte_data(client, ADT7410_CONFIG, data->config);
	434	return ret;
	435	}
	436
436440fc LPC	437	static SIMPLE_DEV_PM_OPS(adt7410_dev_pm_ops, adt7410_suspend, adt7410_resume);
436440fc LPC	438
983b97be HK	439	#define ADT7410_DEV_PM_OPS (&adt7410_dev_pm_ops)
	440	#else
	441	#define ADT7410_DEV_PM_OPS NULL
	442	#endif /* CONFIG_PM */
	443
	444	static struct i2c_driver adt7410_driver = {
	445	.class = I2C_CLASS_HWMON,
	446	.driver = {
	447	.name = "adt7410",
	448	.pm = ADT7410_DEV_PM_OPS,
	449	},
	450	.probe = adt7410_probe,
	451	.remove = adt7410_remove,
	452	.id_table = adt7410_ids,
54be068d	453	.address_list = I2C_ADDRS(0x48, 0x49, 0x4a, 0x4b),
983b97be HK	454	};
	455
	456	module_i2c_driver(adt7410_driver);
	457
	458	MODULE_AUTHOR("Hartmut Knaack");
e46e5dc2	459	MODULE_DESCRIPTION("ADT7410/ADT7420 driver");
983b97be	460	MODULE_LICENSE("GPL");