drivers/hwmon/emc1403.c - kernel/mindspeed - Git at Google

 /*
  * emc1403.c - SMSC Thermal Driver
  *
  * Copyright (C) 2008 Intel Corp
  *
  *  ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  *
  * 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; version 2 of the License.
  *
  * 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.,
  * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  *
  * TODO
  *	-	cache alarm and critical limit registers
  *	-	add emc1404 support
  */

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

 #define THERMAL_PID_REG		0xfd
 #define THERMAL_SMSC_ID_REG	0xfe
 #define THERMAL_REVISION_REG	0xff

 struct thermal_data {
 	struct device *hwmon_dev;
 	struct mutex mutex;
 	/* Cache the hyst value so we don't keep re-reading it. In theory
 	   we could cache it forever as nobody else should be writing it. */
 	u8 cached_hyst;
 	unsigned long hyst_valid;
 };

 static ssize_t show_temp(struct device *dev,
 			struct device_attribute *attr, char *buf)
 {
 	struct i2c_client *client = to_i2c_client(dev);
 	struct sensor_device_attribute *sda = to_sensor_dev_attr(attr);
 	int retval = i2c_smbus_read_byte_data(client, sda->index);

 	if (retval < 0)
 		return retval;
 	return sprintf(buf, "%d000\n", retval);
 }

 static ssize_t show_bit(struct device *dev,
 			struct device_attribute *attr, char *buf)
 {
 	struct i2c_client *client = to_i2c_client(dev);
 	struct sensor_device_attribute_2 *sda = to_sensor_dev_attr_2(attr);
 	int retval = i2c_smbus_read_byte_data(client, sda->nr);

 	if (retval < 0)
 		return retval;
 	retval &= sda->index;
 	return sprintf(buf, "%d\n", retval ? 1 : 0);
 }

 static ssize_t store_temp(struct device *dev,
 		struct device_attribute *attr, const char *buf, size_t count)
 {
 	struct sensor_device_attribute *sda = to_sensor_dev_attr(attr);
 	struct i2c_client *client = to_i2c_client(dev);
 	unsigned long val;
 	int retval;

 	if (strict_strtoul(buf, 10, &val))
 		return -EINVAL;
 	retval = i2c_smbus_write_byte_data(client, sda->index,
 					DIV_ROUND_CLOSEST(val, 1000));
 	if (retval < 0)
 		return retval;
 	return count;
 }

 static ssize_t store_bit(struct device *dev,
 		struct device_attribute *attr, const char *buf, size_t count)
 {
 	struct i2c_client *client = to_i2c_client(dev);
 	struct thermal_data *data = i2c_get_clientdata(client);
 	struct sensor_device_attribute_2 *sda = to_sensor_dev_attr_2(attr);
 	unsigned long val;
 	int retval;

 	if (strict_strtoul(buf, 10, &val))
 		return -EINVAL;

 	mutex_lock(&data->mutex);
 	retval = i2c_smbus_read_byte_data(client, sda->nr);
 	if (retval < 0)
 		goto fail;

 	retval &= ~sda->index;
 	if (val)
 		retval |= sda->index;

 	retval = i2c_smbus_write_byte_data(client, sda->index, retval);
 	if (retval == 0)
 		retval = count;
 fail:
 	mutex_unlock(&data->mutex);
 	return retval;
 }

 static ssize_t show_hyst(struct device *dev,
 			struct device_attribute *attr, char *buf)
 {
 	struct i2c_client *client = to_i2c_client(dev);
 	struct thermal_data *data = i2c_get_clientdata(client);
 	struct sensor_device_attribute *sda = to_sensor_dev_attr(attr);
 	int retval;
 	int hyst;

 	retval = i2c_smbus_read_byte_data(client, sda->index);
 	if (retval < 0)
 		return retval;

 	if (time_after(jiffies, data->hyst_valid)) {
 		hyst = i2c_smbus_read_byte_data(client, 0x21);
 		if (hyst < 0)
 			return retval;
 		data->cached_hyst = hyst;
 		data->hyst_valid = jiffies + HZ;
 	}
 	return sprintf(buf, "%d000\n", retval - data->cached_hyst);
 }

 static ssize_t store_hyst(struct device *dev,
 		struct device_attribute *attr, const char *buf, size_t count)
 {
 	struct i2c_client *client = to_i2c_client(dev);
 	struct thermal_data *data = i2c_get_clientdata(client);
 	struct sensor_device_attribute *sda = to_sensor_dev_attr(attr);
 	int retval;
 	int hyst;
 	unsigned long val;

 	if (strict_strtoul(buf, 10, &val))
 		return -EINVAL;

 	mutex_lock(&data->mutex);
 	retval = i2c_smbus_read_byte_data(client, sda->index);
 	if (retval < 0)
 		goto fail;

 	hyst = val - retval * 1000;
 	hyst = DIV_ROUND_CLOSEST(hyst, 1000);
 	if (hyst < 0 || hyst > 255) {
 		retval = -ERANGE;
 		goto fail;
 	}

 	retval = i2c_smbus_write_byte_data(client, 0x21, hyst);
 	if (retval == 0) {
 		retval = count;
 		data->cached_hyst = hyst;
 		data->hyst_valid = jiffies + HZ;
 	}
 fail:
 	mutex_unlock(&data->mutex);
 	return retval;
 }

 /*
  *	Sensors. We pass the actual i2c register to the methods.
  */

 static SENSOR_DEVICE_ATTR(temp1_min, S_IRUGO | S_IWUSR,
 	show_temp, store_temp, 0x06);
 static SENSOR_DEVICE_ATTR(temp1_max, S_IRUGO | S_IWUSR,
 	show_temp, store_temp, 0x05);
 static SENSOR_DEVICE_ATTR(temp1_crit, S_IRUGO | S_IWUSR,
 	show_temp, store_temp, 0x20);
 static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, show_temp, NULL, 0x00);
 static SENSOR_DEVICE_ATTR_2(temp1_min_alarm, S_IRUGO,
 	show_bit, NULL, 0x36, 0x01);
 static SENSOR_DEVICE_ATTR_2(temp1_max_alarm, S_IRUGO,
 	show_bit, NULL, 0x35, 0x01);
 static SENSOR_DEVICE_ATTR_2(temp1_crit_alarm, S_IRUGO,
 	show_bit, NULL, 0x37, 0x01);
 static SENSOR_DEVICE_ATTR(temp1_crit_hyst, S_IRUGO | S_IWUSR,
 	show_hyst, store_hyst, 0x20);

 static SENSOR_DEVICE_ATTR(temp2_min, S_IRUGO | S_IWUSR,
 	show_temp, store_temp, 0x08);
 static SENSOR_DEVICE_ATTR(temp2_max, S_IRUGO | S_IWUSR,
 	show_temp, store_temp, 0x07);
 static SENSOR_DEVICE_ATTR(temp2_crit, S_IRUGO | S_IWUSR,
 	show_temp, store_temp, 0x19);
 static SENSOR_DEVICE_ATTR(temp2_input, S_IRUGO, show_temp, NULL, 0x01);
 static SENSOR_DEVICE_ATTR_2(temp2_min_alarm, S_IRUGO,
 	show_bit, NULL, 0x36, 0x02);
 static SENSOR_DEVICE_ATTR_2(temp2_max_alarm, S_IRUGO,
 	show_bit, NULL, 0x35, 0x02);
 static SENSOR_DEVICE_ATTR_2(temp2_crit_alarm, S_IRUGO,
 	show_bit, NULL, 0x37, 0x02);
 static SENSOR_DEVICE_ATTR(temp2_crit_hyst, S_IRUGO | S_IWUSR,
 	show_hyst, store_hyst, 0x19);

 static SENSOR_DEVICE_ATTR(temp3_min, S_IRUGO | S_IWUSR,
 	show_temp, store_temp, 0x16);
 static SENSOR_DEVICE_ATTR(temp3_max, S_IRUGO | S_IWUSR,
 	show_temp, store_temp, 0x15);
 static SENSOR_DEVICE_ATTR(temp3_crit, S_IRUGO | S_IWUSR,
 	show_temp, store_temp, 0x1A);
 static SENSOR_DEVICE_ATTR(temp3_input, S_IRUGO, show_temp, NULL, 0x23);
 static SENSOR_DEVICE_ATTR_2(temp3_min_alarm, S_IRUGO,
 	show_bit, NULL, 0x36, 0x04);
 static SENSOR_DEVICE_ATTR_2(temp3_max_alarm, S_IRUGO,
 	show_bit, NULL, 0x35, 0x04);
 static SENSOR_DEVICE_ATTR_2(temp3_crit_alarm, S_IRUGO,
 	show_bit, NULL, 0x37, 0x04);
 static SENSOR_DEVICE_ATTR(temp3_crit_hyst, S_IRUGO | S_IWUSR,
 	show_hyst, store_hyst, 0x1A);

 static SENSOR_DEVICE_ATTR_2(power_state, S_IRUGO | S_IWUSR,
 	show_bit, store_bit, 0x03, 0x40);

 static struct attribute *mid_att_thermal[] = {
 	&sensor_dev_attr_temp1_min.dev_attr.attr,
 	&sensor_dev_attr_temp1_max.dev_attr.attr,
 	&sensor_dev_attr_temp1_crit.dev_attr.attr,
 	&sensor_dev_attr_temp1_input.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,
 	&sensor_dev_attr_temp1_crit_hyst.dev_attr.attr,
 	&sensor_dev_attr_temp2_min.dev_attr.attr,
 	&sensor_dev_attr_temp2_max.dev_attr.attr,
 	&sensor_dev_attr_temp2_crit.dev_attr.attr,
 	&sensor_dev_attr_temp2_input.dev_attr.attr,
 	&sensor_dev_attr_temp2_min_alarm.dev_attr.attr,
 	&sensor_dev_attr_temp2_max_alarm.dev_attr.attr,
 	&sensor_dev_attr_temp2_crit_alarm.dev_attr.attr,
 	&sensor_dev_attr_temp2_crit_hyst.dev_attr.attr,
 	&sensor_dev_attr_temp3_min.dev_attr.attr,
 	&sensor_dev_attr_temp3_max.dev_attr.attr,
 	&sensor_dev_attr_temp3_crit.dev_attr.attr,
 	&sensor_dev_attr_temp3_input.dev_attr.attr,
 	&sensor_dev_attr_temp3_min_alarm.dev_attr.attr,
 	&sensor_dev_attr_temp3_max_alarm.dev_attr.attr,
 	&sensor_dev_attr_temp3_crit_alarm.dev_attr.attr,
 	&sensor_dev_attr_temp3_crit_hyst.dev_attr.attr,
 	&sensor_dev_attr_power_state.dev_attr.attr,
 	NULL
 };

 static const struct attribute_group m_thermal_gr = {
 	.attrs = mid_att_thermal
 };

 static int emc1403_detect(struct i2c_client *client,
 			struct i2c_board_info *info)
 {
 	int id;
 	/* Check if thermal chip is SMSC and EMC1403 or EMC1423 */

 	id = i2c_smbus_read_byte_data(client, THERMAL_SMSC_ID_REG);
 	if (id != 0x5d)
 		return -ENODEV;

 	id = i2c_smbus_read_byte_data(client, THERMAL_PID_REG);
 	switch (id) {
 	case 0x21:
 		strlcpy(info->type, "emc1403", I2C_NAME_SIZE);
 		break;
 	case 0x23:
 		strlcpy(info->type, "emc1423", I2C_NAME_SIZE);
 		break;
 	/* Note: 0x25 is the 1404 which is very similar and this
 	   driver could be extended */
 	default:
 		return -ENODEV;
 	}

 	id = i2c_smbus_read_byte_data(client, THERMAL_REVISION_REG);
 	if (id != 0x01)
 		return -ENODEV;

 	return 0;
 }

 static int emc1403_probe(struct i2c_client *client,
 			const struct i2c_device_id *id)
 {
 	int res;
 	struct thermal_data *data;

 	data = kzalloc(sizeof(struct thermal_data), GFP_KERNEL);
 	if (data == NULL) {
 		dev_warn(&client->dev, "out of memory");
 		return -ENOMEM;
 	}

 	i2c_set_clientdata(client, data);
 	mutex_init(&data->mutex);
 	data->hyst_valid = jiffies - 1;		/* Expired */

 	res = sysfs_create_group(&client->dev.kobj, &m_thermal_gr);
 	if (res) {
 		dev_warn(&client->dev, "create group failed\n");
 		goto thermal_error1;
 	}
 	data->hwmon_dev = hwmon_device_register(&client->dev);
 	if (IS_ERR(data->hwmon_dev)) {
 		res = PTR_ERR(data->hwmon_dev);
 		dev_warn(&client->dev, "register hwmon dev failed\n");
 		goto thermal_error2;
 	}
 	dev_info(&client->dev, "EMC1403 Thermal chip found\n");
 	return res;

 thermal_error2:
 	sysfs_remove_group(&client->dev.kobj, &m_thermal_gr);
 thermal_error1:
 	kfree(data);
 	return res;
 }

 static int emc1403_remove(struct i2c_client *client)
 {
 	struct thermal_data *data = i2c_get_clientdata(client);

 	hwmon_device_unregister(data->hwmon_dev);
 	sysfs_remove_group(&client->dev.kobj, &m_thermal_gr);
 	kfree(data);
 	return 0;
 }

 static const unsigned short emc1403_address_list[] = {
 	0x18, 0x29, 0x4c, 0x4d, I2C_CLIENT_END
 };

 static const struct i2c_device_id emc1403_idtable[] = {
 	{ "emc1403", 0 },
 	{ "emc1423", 0 },
 	{ }
 };
 MODULE_DEVICE_TABLE(i2c, emc1403_idtable);

 static struct i2c_driver sensor_emc1403 = {
 	.class = I2C_CLASS_HWMON,
 	.driver = {
 		.name = "emc1403",
 	},
 	.detect = emc1403_detect,
 	.probe = emc1403_probe,
 	.remove = emc1403_remove,
 	.id_table = emc1403_idtable,
 	.address_list = emc1403_address_list,
 };

 static int __init sensor_emc1403_init(void)
 {
 	return i2c_add_driver(&sensor_emc1403);
 }

 static void  __exit sensor_emc1403_exit(void)
 {
 	i2c_del_driver(&sensor_emc1403);
 }

 module_init(sensor_emc1403_init);
 module_exit(sensor_emc1403_exit);

 MODULE_AUTHOR("Kalhan Trisal <kalhan.trisal@intel.com");
 MODULE_DESCRIPTION("emc1403 Thermal Driver");
 MODULE_LICENSE("GPL v2");
	/*
	* emc1403.c - SMSC Thermal Driver
	*
	* Copyright (C) 2008 Intel Corp
	*
	* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
	*
	* 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; version 2 of the License.
	*
	* 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.,
	* 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
	* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
	*
	* TODO
	* - cache alarm and critical limit registers
	* - add emc1404 support
	*/

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

	#define THERMAL_PID_REG 0xfd
	#define THERMAL_SMSC_ID_REG 0xfe
	#define THERMAL_REVISION_REG 0xff

	struct thermal_data {
	struct device *hwmon_dev;
	struct mutex mutex;
	/* Cache the hyst value so we don't keep re-reading it. In theory
	we could cache it forever as nobody else should be writing it. */
	u8 cached_hyst;
	unsigned long hyst_valid;
	};

	static ssize_t show_temp(struct device *dev,
	struct device_attribute attr, char buf)
	{
	struct i2c_client *client = to_i2c_client(dev);
	struct sensor_device_attribute *sda = to_sensor_dev_attr(attr);
	int retval = i2c_smbus_read_byte_data(client, sda->index);

	if (retval < 0)
	return retval;
	return sprintf(buf, "%d000\n", retval);
	}

	static ssize_t show_bit(struct device *dev,
	struct device_attribute attr, char buf)
	{
	struct i2c_client *client = to_i2c_client(dev);
	struct sensor_device_attribute_2 *sda = to_sensor_dev_attr_2(attr);
	int retval = i2c_smbus_read_byte_data(client, sda->nr);

	if (retval < 0)
	return retval;
	retval &= sda->index;
	return sprintf(buf, "%d\n", retval ? 1 : 0);
	}

	static ssize_t store_temp(struct device *dev,
	struct device_attribute attr, const char buf, size_t count)
	{
	struct sensor_device_attribute *sda = to_sensor_dev_attr(attr);
	struct i2c_client *client = to_i2c_client(dev);
	unsigned long val;
	int retval;

	if (strict_strtoul(buf, 10, &val))
	return -EINVAL;
	retval = i2c_smbus_write_byte_data(client, sda->index,
	DIV_ROUND_CLOSEST(val, 1000));
	if (retval < 0)
	return retval;
	return count;
	}

	static ssize_t store_bit(struct device *dev,
	struct device_attribute attr, const char buf, size_t count)
	{
	struct i2c_client *client = to_i2c_client(dev);
	struct thermal_data *data = i2c_get_clientdata(client);
	struct sensor_device_attribute_2 *sda = to_sensor_dev_attr_2(attr);
	unsigned long val;
	int retval;

	if (strict_strtoul(buf, 10, &val))
	return -EINVAL;

	mutex_lock(&data->mutex);
	retval = i2c_smbus_read_byte_data(client, sda->nr);
	if (retval < 0)
	goto fail;

	retval &= ~sda->index;
	if (val)
	retval \|= sda->index;

	retval = i2c_smbus_write_byte_data(client, sda->index, retval);
	if (retval == 0)
	retval = count;
	fail:
	mutex_unlock(&data->mutex);
	return retval;
	}

	static ssize_t show_hyst(struct device *dev,
	struct device_attribute attr, char buf)
	{
	struct i2c_client *client = to_i2c_client(dev);
	struct thermal_data *data = i2c_get_clientdata(client);
	struct sensor_device_attribute *sda = to_sensor_dev_attr(attr);
	int retval;
	int hyst;

	retval = i2c_smbus_read_byte_data(client, sda->index);
	if (retval < 0)
	return retval;

	if (time_after(jiffies, data->hyst_valid)) {
	hyst = i2c_smbus_read_byte_data(client, 0x21);
	if (hyst < 0)
	return retval;
	data->cached_hyst = hyst;
	data->hyst_valid = jiffies + HZ;
	}
	return sprintf(buf, "%d000\n", retval - data->cached_hyst);
	}

	static ssize_t store_hyst(struct device *dev,
	struct device_attribute attr, const char buf, size_t count)
	{
	struct i2c_client *client = to_i2c_client(dev);
	struct thermal_data *data = i2c_get_clientdata(client);
	struct sensor_device_attribute *sda = to_sensor_dev_attr(attr);
	int retval;
	int hyst;
	unsigned long val;

	if (strict_strtoul(buf, 10, &val))
	return -EINVAL;

	mutex_lock(&data->mutex);
	retval = i2c_smbus_read_byte_data(client, sda->index);
	if (retval < 0)
	goto fail;

	hyst = val - retval * 1000;
	hyst = DIV_ROUND_CLOSEST(hyst, 1000);
	if (hyst < 0 \|\| hyst > 255) {
	retval = -ERANGE;
	goto fail;
	}

	retval = i2c_smbus_write_byte_data(client, 0x21, hyst);
	if (retval == 0) {
	retval = count;
	data->cached_hyst = hyst;
	data->hyst_valid = jiffies + HZ;
	}
	fail:
	mutex_unlock(&data->mutex);
	return retval;
	}

	/*
	* Sensors. We pass the actual i2c register to the methods.
	*/

	static SENSOR_DEVICE_ATTR(temp1_min, S_IRUGO \| S_IWUSR,
	show_temp, store_temp, 0x06);
	static SENSOR_DEVICE_ATTR(temp1_max, S_IRUGO \| S_IWUSR,
	show_temp, store_temp, 0x05);
	static SENSOR_DEVICE_ATTR(temp1_crit, S_IRUGO \| S_IWUSR,
	show_temp, store_temp, 0x20);
	static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, show_temp, NULL, 0x00);
	static SENSOR_DEVICE_ATTR_2(temp1_min_alarm, S_IRUGO,
	show_bit, NULL, 0x36, 0x01);
	static SENSOR_DEVICE_ATTR_2(temp1_max_alarm, S_IRUGO,
	show_bit, NULL, 0x35, 0x01);
	static SENSOR_DEVICE_ATTR_2(temp1_crit_alarm, S_IRUGO,
	show_bit, NULL, 0x37, 0x01);
	static SENSOR_DEVICE_ATTR(temp1_crit_hyst, S_IRUGO \| S_IWUSR,
	show_hyst, store_hyst, 0x20);

	static SENSOR_DEVICE_ATTR(temp2_min, S_IRUGO \| S_IWUSR,
	show_temp, store_temp, 0x08);
	static SENSOR_DEVICE_ATTR(temp2_max, S_IRUGO \| S_IWUSR,
	show_temp, store_temp, 0x07);
	static SENSOR_DEVICE_ATTR(temp2_crit, S_IRUGO \| S_IWUSR,
	show_temp, store_temp, 0x19);
	static SENSOR_DEVICE_ATTR(temp2_input, S_IRUGO, show_temp, NULL, 0x01);
	static SENSOR_DEVICE_ATTR_2(temp2_min_alarm, S_IRUGO,
	show_bit, NULL, 0x36, 0x02);
	static SENSOR_DEVICE_ATTR_2(temp2_max_alarm, S_IRUGO,
	show_bit, NULL, 0x35, 0x02);
	static SENSOR_DEVICE_ATTR_2(temp2_crit_alarm, S_IRUGO,
	show_bit, NULL, 0x37, 0x02);
	static SENSOR_DEVICE_ATTR(temp2_crit_hyst, S_IRUGO \| S_IWUSR,
	show_hyst, store_hyst, 0x19);

	static SENSOR_DEVICE_ATTR(temp3_min, S_IRUGO \| S_IWUSR,
	show_temp, store_temp, 0x16);
	static SENSOR_DEVICE_ATTR(temp3_max, S_IRUGO \| S_IWUSR,
	show_temp, store_temp, 0x15);
	static SENSOR_DEVICE_ATTR(temp3_crit, S_IRUGO \| S_IWUSR,
	show_temp, store_temp, 0x1A);
	static SENSOR_DEVICE_ATTR(temp3_input, S_IRUGO, show_temp, NULL, 0x23);
	static SENSOR_DEVICE_ATTR_2(temp3_min_alarm, S_IRUGO,
	show_bit, NULL, 0x36, 0x04);
	static SENSOR_DEVICE_ATTR_2(temp3_max_alarm, S_IRUGO,
	show_bit, NULL, 0x35, 0x04);
	static SENSOR_DEVICE_ATTR_2(temp3_crit_alarm, S_IRUGO,
	show_bit, NULL, 0x37, 0x04);
	static SENSOR_DEVICE_ATTR(temp3_crit_hyst, S_IRUGO \| S_IWUSR,
	show_hyst, store_hyst, 0x1A);

	static SENSOR_DEVICE_ATTR_2(power_state, S_IRUGO \| S_IWUSR,
	show_bit, store_bit, 0x03, 0x40);

	static struct attribute *mid_att_thermal[] = {
	&sensor_dev_attr_temp1_min.dev_attr.attr,
	&sensor_dev_attr_temp1_max.dev_attr.attr,
	&sensor_dev_attr_temp1_crit.dev_attr.attr,
	&sensor_dev_attr_temp1_input.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,
	&sensor_dev_attr_temp1_crit_hyst.dev_attr.attr,
	&sensor_dev_attr_temp2_min.dev_attr.attr,
	&sensor_dev_attr_temp2_max.dev_attr.attr,
	&sensor_dev_attr_temp2_crit.dev_attr.attr,
	&sensor_dev_attr_temp2_input.dev_attr.attr,
	&sensor_dev_attr_temp2_min_alarm.dev_attr.attr,
	&sensor_dev_attr_temp2_max_alarm.dev_attr.attr,
	&sensor_dev_attr_temp2_crit_alarm.dev_attr.attr,
	&sensor_dev_attr_temp2_crit_hyst.dev_attr.attr,
	&sensor_dev_attr_temp3_min.dev_attr.attr,
	&sensor_dev_attr_temp3_max.dev_attr.attr,
	&sensor_dev_attr_temp3_crit.dev_attr.attr,
	&sensor_dev_attr_temp3_input.dev_attr.attr,
	&sensor_dev_attr_temp3_min_alarm.dev_attr.attr,
	&sensor_dev_attr_temp3_max_alarm.dev_attr.attr,
	&sensor_dev_attr_temp3_crit_alarm.dev_attr.attr,
	&sensor_dev_attr_temp3_crit_hyst.dev_attr.attr,
	&sensor_dev_attr_power_state.dev_attr.attr,
	NULL
	};

	static const struct attribute_group m_thermal_gr = {
	.attrs = mid_att_thermal
	};

	static int emc1403_detect(struct i2c_client *client,
	struct i2c_board_info *info)
	{
	int id;
	/* Check if thermal chip is SMSC and EMC1403 or EMC1423 */

	id = i2c_smbus_read_byte_data(client, THERMAL_SMSC_ID_REG);
	if (id != 0x5d)
	return -ENODEV;

	id = i2c_smbus_read_byte_data(client, THERMAL_PID_REG);
	switch (id) {
	case 0x21:
	strlcpy(info->type, "emc1403", I2C_NAME_SIZE);
	break;
	case 0x23:
	strlcpy(info->type, "emc1423", I2C_NAME_SIZE);
	break;
	/* Note: 0x25 is the 1404 which is very similar and this
	driver could be extended */
	default:
	return -ENODEV;
	}

	id = i2c_smbus_read_byte_data(client, THERMAL_REVISION_REG);
	if (id != 0x01)
	return -ENODEV;

	return 0;
	}

	static int emc1403_probe(struct i2c_client *client,
	const struct i2c_device_id *id)
	{
	int res;
	struct thermal_data *data;

	data = kzalloc(sizeof(struct thermal_data), GFP_KERNEL);
	if (data == NULL) {
	dev_warn(&client->dev, "out of memory");
	return -ENOMEM;
	}

	i2c_set_clientdata(client, data);
	mutex_init(&data->mutex);
	data->hyst_valid = jiffies - 1; /* Expired */

	res = sysfs_create_group(&client->dev.kobj, &m_thermal_gr);
	if (res) {
	dev_warn(&client->dev, "create group failed\n");
	goto thermal_error1;
	}
	data->hwmon_dev = hwmon_device_register(&client->dev);
	if (IS_ERR(data->hwmon_dev)) {
	res = PTR_ERR(data->hwmon_dev);
	dev_warn(&client->dev, "register hwmon dev failed\n");
	goto thermal_error2;
	}
	dev_info(&client->dev, "EMC1403 Thermal chip found\n");
	return res;

	thermal_error2:
	sysfs_remove_group(&client->dev.kobj, &m_thermal_gr);
	thermal_error1:
	kfree(data);
	return res;
	}

	static int emc1403_remove(struct i2c_client *client)
	{
	struct thermal_data *data = i2c_get_clientdata(client);

	hwmon_device_unregister(data->hwmon_dev);
	sysfs_remove_group(&client->dev.kobj, &m_thermal_gr);
	kfree(data);
	return 0;
	}

	static const unsigned short emc1403_address_list[] = {
	0x18, 0x29, 0x4c, 0x4d, I2C_CLIENT_END
	};

	static const struct i2c_device_id emc1403_idtable[] = {
	{ "emc1403", 0 },
	{ "emc1423", 0 },
	{ }
	};
	MODULE_DEVICE_TABLE(i2c, emc1403_idtable);

	static struct i2c_driver sensor_emc1403 = {
	.class = I2C_CLASS_HWMON,
	.driver = {
	.name = "emc1403",
	},
	.detect = emc1403_detect,
	.probe = emc1403_probe,
	.remove = emc1403_remove,
	.id_table = emc1403_idtable,
	.address_list = emc1403_address_list,
	};

	static int __init sensor_emc1403_init(void)
	{
	return i2c_add_driver(&sensor_emc1403);
	}

	static void __exit sensor_emc1403_exit(void)
	{
	i2c_del_driver(&sensor_emc1403);
	}

	module_init(sensor_emc1403_init);
	module_exit(sensor_emc1403_exit);

	MODULE_AUTHOR("Kalhan Trisal <kalhan.trisal@intel.com");
	MODULE_DESCRIPTION("emc1403 Thermal Driver");
	MODULE_LICENSE("GPL v2");