[mirror_ubuntu-zesty-kernel.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,
};

/* Addresses scanned */
static const unsigned short normal_i2c[] = { 0x48, 0x49, 0x4a, 0x4b,
					I2C_CLIENT_END };

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.
	 */
	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, },
	{ /* LIST END */ }
};
MODULE_DEVICE_TABLE(i2c, adt7410_ids);

#ifdef CONFIG_PM
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 const struct dev_pm_ops adt7410_dev_pm_ops = {
	.suspend	= adt7410_suspend,
	.resume		= 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	= normal_i2c,
};

module_i2c_driver(adt7410_driver);

MODULE_AUTHOR("Hartmut Knaack");
MODULE_DESCRIPTION("ADT7410 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
81	/* Addresses scanned */
82	static const unsigned short normal_i2c[] = { 0x48, 0x49, 0x4a, 0x4b,
83	I2C_CLIENT_END };
84
85	static const u8 ADT7410_REG_TEMP[4] = {
86	ADT7410_TEMPERATURE, /* input */
87	ADT7410_T_ALARM_HIGH, /* high */
88	ADT7410_T_ALARM_LOW, /* low */
89	ADT7410_T_CRIT, /* critical */
90	};
91
92	/* Each client has this additional data */
93	struct adt7410_data {
94	struct device *hwmon_dev;
95	struct mutex update_lock;
96	u8 config;
97	u8 oldconfig;
98	bool valid; /* true if registers valid */
99	unsigned long last_updated; /* In jiffies */
100	s16 temp[4]; /* Register values,
101	0 = input
102	1 = high
103	2 = low
104	3 = critical */
105	u8 hyst; /* hysteresis offset */
106	};
107
108	/*
109	* adt7410 register access by I2C
110	*/
111	static int adt7410_temp_ready(struct i2c_client *client)
112	{
113	int i, status;
114
115	for (i = 0; i < 6; i++) {
116	status = i2c_smbus_read_byte_data(client, ADT7410_STATUS);
117	if (status < 0)
118	return status;
119	if (!(status & ADT7410_STAT_NOT_RDY))
120	return 0;
121	msleep(60);
122	}
123	return -ETIMEDOUT;
124	}
125
126	static struct adt7410_data adt7410_update_device(struct device dev)
127	{
128	struct i2c_client *client = to_i2c_client(dev);
129	struct adt7410_data *data = i2c_get_clientdata(client);
130	struct adt7410_data *ret = data;
131	mutex_lock(&data->update_lock);
132
133	if (time_after(jiffies, data->last_updated + HZ + HZ / 2)
134	\|\| !data->valid) {
135	int i, status;
136
137	dev_dbg(&client->dev, "Starting update\n");
138
139	status = adt7410_temp_ready(client); /* check for new value */
140	if (unlikely(status)) {
141	ret = ERR_PTR(status);
142	goto abort;
143	}
144	for (i = 0; i < ARRAY_SIZE(data->temp); i++) {
145	status = i2c_smbus_read_word_swapped(client,
146	ADT7410_REG_TEMP[i]);
147	if (unlikely(status < 0)) {
148	dev_dbg(dev,
149	"Failed to read value: reg %d, error %d\n",
150	ADT7410_REG_TEMP[i], status);
151	ret = ERR_PTR(status);
152	goto abort;
153	}
154	data->temp[i] = status;
155	}
156	status = i2c_smbus_read_byte_data(client, ADT7410_T_HYST);
157	if (unlikely(status < 0)) {
158	dev_dbg(dev,
159	"Failed to read value: reg %d, error %d\n",
160	ADT7410_T_HYST, status);
161	ret = ERR_PTR(status);
162	goto abort;
163	}
164	data->hyst = status;
165	data->last_updated = jiffies;
166	data->valid = true;
167	}
168
169	abort:
170	mutex_unlock(&data->update_lock);
171	return ret;
172	}
173
174	static s16 ADT7410_TEMP_TO_REG(long temp)
175	{
2a844c14 GR	176	return DIV_ROUND_CLOSEST(clamp_val(temp, ADT7410_TEMP_MIN,
2a844c14 GR	177	ADT7410_TEMP_MAX) * 128, 1000);
983b97be HK	178	}
	179
	180	static int ADT7410_REG_TO_TEMP(struct adt7410_data *data, s16 reg)
	181	{
	182	/* in 13 bit mode, bits 0-2 are status flags - mask them out */
	183	if (!(data->config & ADT7410_RESOLUTION))
	184	reg &= ADT7410_T13_VALUE_MASK;
	185	/*
	186	* temperature is stored in twos complement format, in steps of
	187	* 1/128°C
	188	*/
	189	return DIV_ROUND_CLOSEST(reg * 1000, 128);
	190	}
	191
	192	/-----------------------------------------------------------------------/
	193
	194	/* sysfs attributes for hwmon */
	195
	196	static ssize_t adt7410_show_temp(struct device *dev,
	197	struct device_attribute da, char buf)
	198	{
	199	struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
	200	struct adt7410_data *data = adt7410_update_device(dev);
	201
	202	if (IS_ERR(data))
	203	return PTR_ERR(data);
	204
	205	return sprintf(buf, "%d\n", ADT7410_REG_TO_TEMP(data,
	206	data->temp[attr->index]));
	207	}
	208
	209	static ssize_t adt7410_set_temp(struct device *dev,
	210	struct device_attribute *da,
	211	const char *buf, size_t count)
	212	{
	213	struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
	214	struct i2c_client *client = to_i2c_client(dev);
	215	struct adt7410_data *data = i2c_get_clientdata(client);
	216	int nr = attr->index;
	217	long temp;
	218	int ret;
	219
	220	ret = kstrtol(buf, 10, &temp);
	221	if (ret)
	222	return ret;
	223
	224	mutex_lock(&data->update_lock);
	225	data->temp[nr] = ADT7410_TEMP_TO_REG(temp);
	226	ret = i2c_smbus_write_word_swapped(client, ADT7410_REG_TEMP[nr],
	227	data->temp[nr]);
	228	if (ret)
	229	count = ret;
	230	mutex_unlock(&data->update_lock);
	231	return count;
	232	}
	233
	234	static ssize_t adt7410_show_t_hyst(struct device *dev,
	235	struct device_attribute *da,
	236	char *buf)
	237	{
	238	struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
37f9648b	239	struct adt7410_data *data;
983b97be	240	int nr = attr->index;
37f9648b DC	241	int hyst;
	242
	243	data = adt7410_update_device(dev);
	244	if (IS_ERR(data))
	245	return PTR_ERR(data);
	246	hyst = (data->hyst & ADT7410_T_HYST_MASK) * 1000;
983b97be HK	247
	248	/*
	249	* hysteresis is stored as a 4 bit offset in the device, convert it
	250	* to an absolute value
	251	*/
	252	if (nr == 2) /* min has positive offset, others have negative */
	253	hyst = -hyst;
	254	return sprintf(buf, "%d\n",
	255	ADT7410_REG_TO_TEMP(data, data->temp[nr]) - hyst);
	256	}
	257
	258	static ssize_t adt7410_set_t_hyst(struct device *dev,
	259	struct device_attribute *da,
	260	const char *buf, size_t count)
	261	{
	262	struct i2c_client *client = to_i2c_client(dev);
	263	struct adt7410_data *data = i2c_get_clientdata(client);
	264	int limit, ret;
	265	long hyst;
	266
	267	ret = kstrtol(buf, 10, &hyst);
	268	if (ret)
	269	return ret;
	270	/* convert absolute hysteresis value to a 4 bit delta value */
	271	limit = ADT7410_REG_TO_TEMP(data, data->temp[1]);
2a844c14 GR	272	hyst = clamp_val(hyst, ADT7410_TEMP_MIN, ADT7410_TEMP_MAX);
	273	data->hyst = clamp_val(DIV_ROUND_CLOSEST(limit - hyst, 1000), 0,
	274	ADT7410_T_HYST_MASK);
983b97be HK	275	ret = i2c_smbus_write_byte_data(client, ADT7410_T_HYST, data->hyst);
	276	if (ret)
	277	return ret;
	278
	279	return count;
	280	}
	281
	282	static ssize_t adt7410_show_alarm(struct device *dev,
	283	struct device_attribute *da,
	284	char *buf)
	285	{
	286	struct i2c_client *client = to_i2c_client(dev);
	287	struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
	288	int ret;
	289
	290	ret = i2c_smbus_read_byte_data(client, ADT7410_STATUS);
	291	if (ret < 0)
	292	return ret;
	293
	294	return sprintf(buf, "%d\n", !!(ret & attr->index));
	295	}
	296
	297	static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, adt7410_show_temp, NULL, 0);
	298	static SENSOR_DEVICE_ATTR(temp1_max, S_IWUSR \| S_IRUGO,
	299	adt7410_show_temp, adt7410_set_temp, 1);
	300	static SENSOR_DEVICE_ATTR(temp1_min, S_IWUSR \| S_IRUGO,
	301	adt7410_show_temp, adt7410_set_temp, 2);
	302	static SENSOR_DEVICE_ATTR(temp1_crit, S_IWUSR \| S_IRUGO,
	303	adt7410_show_temp, adt7410_set_temp, 3);
	304	static SENSOR_DEVICE_ATTR(temp1_max_hyst, S_IWUSR \| S_IRUGO,
	305	adt7410_show_t_hyst, adt7410_set_t_hyst, 1);
	306	static SENSOR_DEVICE_ATTR(temp1_min_hyst, S_IRUGO,
	307	adt7410_show_t_hyst, NULL, 2);
	308	static SENSOR_DEVICE_ATTR(temp1_crit_hyst, S_IRUGO,
	309	adt7410_show_t_hyst, NULL, 3);
	310	static SENSOR_DEVICE_ATTR(temp1_min_alarm, S_IRUGO, adt7410_show_alarm,
	311	NULL, ADT7410_STAT_T_LOW);
	312	static SENSOR_DEVICE_ATTR(temp1_max_alarm, S_IRUGO, adt7410_show_alarm,
	313	NULL, ADT7410_STAT_T_HIGH);
	314	static SENSOR_DEVICE_ATTR(temp1_crit_alarm, S_IRUGO, adt7410_show_alarm,
	315	NULL, ADT7410_STAT_T_CRIT);
	316
	317	static struct attribute *adt7410_attributes[] = {
	318	&sensor_dev_attr_temp1_input.dev_attr.attr,
	319	&sensor_dev_attr_temp1_max.dev_attr.attr,
	320	&sensor_dev_attr_temp1_min.dev_attr.attr,
	321	&sensor_dev_attr_temp1_crit.dev_attr.attr,
	322	&sensor_dev_attr_temp1_max_hyst.dev_attr.attr,
	323	&sensor_dev_attr_temp1_min_hyst.dev_attr.attr,
	324	&sensor_dev_attr_temp1_crit_hyst.dev_attr.attr,
	325	&sensor_dev_attr_temp1_min_alarm.dev_attr.attr,
	326	&sensor_dev_attr_temp1_max_alarm.dev_attr.attr,
	327	&sensor_dev_attr_temp1_crit_alarm.dev_attr.attr,
	328	NULL
	329	};
	330
	331	static const struct attribute_group adt7410_group = {
	332	.attrs = adt7410_attributes,
	333	};
	334
	335	/-----------------------------------------------------------------------/
	336
	337	/* device probe and removal */
	338
339	static int adt7410_probe(struct i2c_client *client,
340	const struct i2c_device_id *id)
341	{
342	struct adt7410_data *data;
343	int ret;
344
345	if (!i2c_check_functionality(client->adapter,
346	I2C_FUNC_SMBUS_BYTE_DATA \| I2C_FUNC_SMBUS_WORD_DATA))
347	return -ENODEV;
348
349	data = devm_kzalloc(&client->dev, sizeof(struct adt7410_data),
350	GFP_KERNEL);
351	if (!data)
352	return -ENOMEM;
353
354	i2c_set_clientdata(client, data);
355	mutex_init(&data->update_lock);
356
357	/* configure as specified */
358	ret = i2c_smbus_read_byte_data(client, ADT7410_CONFIG);
359	if (ret < 0) {
360	dev_dbg(&client->dev, "Can't read config? %d\n", ret);
361	return ret;
362	}
363	data->oldconfig = ret;
364	/*
365	* Set to 16 bit resolution, continous conversion and comparator mode.
366	*/
367	data->config = ret \| ADT7410_FULL \| ADT7410_RESOLUTION \|
368	ADT7410_EVENT_MODE;
369	if (data->config != data->oldconfig) {
370	ret = i2c_smbus_write_byte_data(client, ADT7410_CONFIG,
371	data->config);
372	if (ret)
373	return ret;
374	}
375	dev_dbg(&client->dev, "Config %02x\n", data->config);
376
377	/* Register sysfs hooks */
378	ret = sysfs_create_group(&client->dev.kobj, &adt7410_group);
379	if (ret)
380	goto exit_restore;
381
382	data->hwmon_dev = hwmon_device_register(&client->dev);
383	if (IS_ERR(data->hwmon_dev)) {
384	ret = PTR_ERR(data->hwmon_dev);
385	goto exit_remove;
386	}
387
388	dev_info(&client->dev, "sensor '%s'\n", client->name);
389
390	return 0;
391
392	exit_remove:
393	sysfs_remove_group(&client->dev.kobj, &adt7410_group);
394	exit_restore:
395	i2c_smbus_write_byte_data(client, ADT7410_CONFIG, data->oldconfig);
396	return ret;
397	}
398
399	static int adt7410_remove(struct i2c_client *client)
400	{
401	struct adt7410_data *data = i2c_get_clientdata(client);
402
403	hwmon_device_unregister(data->hwmon_dev);
404	sysfs_remove_group(&client->dev.kobj, &adt7410_group);
405	if (data->oldconfig != data->config)
406	i2c_smbus_write_byte_data(client, ADT7410_CONFIG,
407	data->oldconfig);
408	return 0;
409	}
410
411	static const struct i2c_device_id adt7410_ids[] = {
412	{ "adt7410", adt7410, },
413	{ /* LIST END */ }
414	};
415	MODULE_DEVICE_TABLE(i2c, adt7410_ids);
416
417	#ifdef CONFIG_PM
418	static int adt7410_suspend(struct device *dev)
419	{
420	int ret;
421	struct i2c_client *client = to_i2c_client(dev);
422	struct adt7410_data *data = i2c_get_clientdata(client);
423
424	ret = i2c_smbus_write_byte_data(client, ADT7410_CONFIG,
425	data->config \| ADT7410_PD);
426	return ret;
427	}
428
429	static int adt7410_resume(struct device *dev)
430	{
431	int ret;
432	struct i2c_client *client = to_i2c_client(dev);
433	struct adt7410_data *data = i2c_get_clientdata(client);
434
435	ret = i2c_smbus_write_byte_data(client, ADT7410_CONFIG, data->config);
436	return ret;
437	}
438
439	static const struct dev_pm_ops adt7410_dev_pm_ops = {
440	.suspend = adt7410_suspend,
441	.resume = adt7410_resume,
442	};
443	#define ADT7410_DEV_PM_OPS (&adt7410_dev_pm_ops)
444	#else
445	#define ADT7410_DEV_PM_OPS NULL
446	#endif /* CONFIG_PM */
447
448	static struct i2c_driver adt7410_driver = {
449	.class = I2C_CLASS_HWMON,
450	.driver = {
451	.name = "adt7410",
452	.pm = ADT7410_DEV_PM_OPS,
453	},
454	.probe = adt7410_probe,
455	.remove = adt7410_remove,
456	.id_table = adt7410_ids,
457	.address_list = normal_i2c,
458	};
459
460	module_i2c_driver(adt7410_driver);
461
462	MODULE_AUTHOR("Hartmut Knaack");
463	MODULE_DESCRIPTION("ADT7410 driver");
464	MODULE_LICENSE("GPL");