Commit b0b349a8 authored by Jean Delvare's avatar Jean Delvare Committed by Jean Delvare
Browse files

hwmon: New driver for the SMSC EMC6W201 



This is a new driver for the SMSC EMC6W201 hardware monitoring device.
The device is functionally close to the EMC6D100 series, but is
register-incompatible.

Signed-off-by: default avatarJean Delvare <khali@linux-fr.org>
Tested-by: default avatarHarry G McGavran Jr <w5pny@arrl.net>
Tested-by: default avatarJeff Rickman <jrickman@myamigos.us>
Acked-by: default avatarGuenter Roeck <guenter.roeck@ericsson.com>
parent ec693fe5

Documentation/hwmon/emc6w201

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Kernel driver emc6w201

======================



Supported chips:

  * SMSC EMC6W201

    Prefix: 'emc6w201'

    Addresses scanned: I2C 0x2c, 0x2d, 0x2e

    Datasheet: Not public



Author: Jean Delvare <khali@linux-fr.org>





Description

-----------



From the datasheet:



"The EMC6W201 is an environmental monitoring device with automatic fan

control capability and enhanced system acoustics for noise suppression.

This ACPI compliant device provides hardware monitoring for up to six

voltages (including its own VCC) and five external thermal sensors,

measures the speed of up to five fans, and controls the speed of

multiple DC fans using three Pulse Width Modulator (PWM) outputs. Note

that it is possible to control more than three fans by connecting two

fans to one PWM output. The EMC6W201 will be available in a 36-pin

QFN package."



The device is functionally close to the EMC6D100 series, but is

register-incompatible.



The driver currently only supports the monitoring of the voltages,

temperatures and fan speeds. Limits can be changed. Alarms are not

supported, and neither is fan speed control.





Known Systems With EMC6W201

---------------------------



The EMC6W201 is a rare device, only found on a few systems, made in

2005 and 2006. Known systems with this device:

* Dell Precision 670 workstation

* Gigabyte 2CEWH mainboard

drivers/hwmon/Kconfig

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@@ -988,6 +988,16 @@ config SENSORS_EMC2103 
	  This driver can also be built as a module.  If so, the module

	  will be called emc2103.



config SENSORS_EMC6W201

	tristate "SMSC EMC6W201"

	depends on I2C

	help

	  If you say yes here you get support for the SMSC EMC6W201

	  hardware monitoring chip.



	  This driver can also be built as a module.  If so, the module

	  will be called emc6w201.



config SENSORS_SMSC47M1

	tristate "SMSC LPC47M10x and compatibles"

	help

drivers/hwmon/Makefile

+1 −0
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@@ -46,6 +46,7 @@ obj-$(CONFIG_SENSORS_DS620) += ds620.o 
obj-$(CONFIG_SENSORS_DS1621)	+= ds1621.o

obj-$(CONFIG_SENSORS_EMC1403)	+= emc1403.o

obj-$(CONFIG_SENSORS_EMC2103)	+= emc2103.o

obj-$(CONFIG_SENSORS_EMC6W201)	+= emc6w201.o

obj-$(CONFIG_SENSORS_F71805F)	+= f71805f.o

obj-$(CONFIG_SENSORS_F71882FG)	+= f71882fg.o

obj-$(CONFIG_SENSORS_F75375S)	+= f75375s.o

drivers/hwmon/emc6w201.c

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/*

 * emc6w201.c - Hardware monitoring driver for the SMSC EMC6W201

 * Copyright (C) 2011  Jean Delvare <khali@linux-fr.org>

 *

 * 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/delay.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>



/*

 * Addresses to scan

 */



static const unsigned short normal_i2c[] = { 0x2c, 0x2d, 0x2e, I2C_CLIENT_END };



/*

 * The EMC6W201 registers

 */



#define EMC6W201_REG_IN(nr)		(0x20 + (nr))

#define EMC6W201_REG_TEMP(nr)		(0x26 + (nr))

#define EMC6W201_REG_FAN(nr)		(0x2C + (nr) * 2)

#define EMC6W201_REG_COMPANY		0x3E

#define EMC6W201_REG_VERSTEP		0x3F

#define EMC6W201_REG_CONFIG		0x40

#define EMC6W201_REG_IN_LOW(nr)		(0x4A + (nr) * 2)

#define EMC6W201_REG_IN_HIGH(nr)	(0x4B + (nr) * 2)

#define EMC6W201_REG_TEMP_LOW(nr)	(0x56 + (nr) * 2)

#define EMC6W201_REG_TEMP_HIGH(nr)	(0x57 + (nr) * 2)

#define EMC6W201_REG_FAN_MIN(nr)	(0x62 + (nr) * 2)



enum { input, min, max } subfeature;



/*

 * Per-device data

 */



struct emc6w201_data {

	struct device *hwmon_dev;

	struct mutex update_lock;

	char valid; /* zero until following fields are valid */

	unsigned long last_updated; /* in jiffies */



	/* registers values */

	u8 in[3][6];

	s8 temp[3][6];

	u16 fan[2][5];

};



/*

 * Combine LSB and MSB registers in a single value

 * Locking: must be called with data->update_lock held

 */

static u16 emc6w201_read16(struct i2c_client *client, u8 reg)

{

	int lsb, msb;



	lsb = i2c_smbus_read_byte_data(client, reg);

	msb = i2c_smbus_read_byte_data(client, reg + 1);

	if (lsb < 0 || msb < 0) {

		dev_err(&client->dev, "16-bit read failed at 0x%02x\n", reg);

		return 0xFFFF;	/* Arbitrary value */

	}



	return (msb << 8) | lsb;

}



/*

 * Write 16-bit value to LSB and MSB registers

 * Locking: must be called with data->update_lock held

 */

static int emc6w201_write16(struct i2c_client *client, u8 reg, u16 val)

{

	int err;



	err = i2c_smbus_write_byte_data(client, reg, val & 0xff);

	if (!err)

		err = i2c_smbus_write_byte_data(client, reg + 1, val >> 8);

	if (err < 0)

		dev_err(&client->dev, "16-bit write failed at 0x%02x\n", reg);



	return err;

}



static struct emc6w201_data *emc6w201_update_device(struct device *dev)

{

	struct i2c_client *client = to_i2c_client(dev);

	struct emc6w201_data *data = i2c_get_clientdata(client);

	int nr;



	mutex_lock(&data->update_lock);



	if (time_after(jiffies, data->last_updated + HZ) || !data->valid) {

		for (nr = 0; nr < 6; nr++) {

			data->in[input][nr] =

				i2c_smbus_read_byte_data(client,

						EMC6W201_REG_IN(nr));

			data->in[min][nr] =

				i2c_smbus_read_byte_data(client,

						EMC6W201_REG_IN_LOW(nr));

			data->in[max][nr] =

				i2c_smbus_read_byte_data(client,

						EMC6W201_REG_IN_HIGH(nr));

		}



		for (nr = 0; nr < 6; nr++) {

			data->temp[input][nr] =

				i2c_smbus_read_byte_data(client,

						EMC6W201_REG_TEMP(nr));

			data->temp[min][nr] =

				i2c_smbus_read_byte_data(client,

						EMC6W201_REG_TEMP_LOW(nr));

			data->temp[max][nr] =

				i2c_smbus_read_byte_data(client,

						EMC6W201_REG_TEMP_HIGH(nr));

		}



		for (nr = 0; nr < 5; nr++) {

			data->fan[input][nr] =

				emc6w201_read16(client,

						EMC6W201_REG_FAN(nr));

			data->fan[min][nr] =

				emc6w201_read16(client,

						EMC6W201_REG_FAN_MIN(nr));

		}



		data->last_updated = jiffies;

		data->valid = 1;

	}



	mutex_unlock(&data->update_lock);



	return data;

}



/*

 * Sysfs callback functions

 */



static const u16 nominal_mv[6] = { 2500, 1500, 3300, 5000, 1500, 1500 };



static ssize_t show_in(struct device *dev, struct device_attribute *devattr,

	char *buf)

{

	struct emc6w201_data *data = emc6w201_update_device(dev);

	int sf = to_sensor_dev_attr_2(devattr)->index;

	int nr = to_sensor_dev_attr_2(devattr)->nr;



	return sprintf(buf, "%u\n",

		       (unsigned)data->in[sf][nr] * nominal_mv[nr] / 0xC0);

}



static ssize_t set_in(struct device *dev, struct device_attribute *devattr,

		      const char *buf, size_t count)

{

	struct i2c_client *client = to_i2c_client(dev);

	struct emc6w201_data *data = i2c_get_clientdata(client);

	int sf = to_sensor_dev_attr_2(devattr)->index;

	int nr = to_sensor_dev_attr_2(devattr)->nr;

	int err;

	long val;

	u8 reg;



	err = strict_strtol(buf, 10, &val);

	if (err < 0)

		return err;



	val = DIV_ROUND_CLOSEST(val * 0xC0, nominal_mv[nr]);

	reg = (sf == min) ? EMC6W201_REG_IN_LOW(nr)

			  : EMC6W201_REG_IN_HIGH(nr);



	mutex_lock(&data->update_lock);

	data->in[sf][nr] = SENSORS_LIMIT(val, 0, 255);

	err = i2c_smbus_write_byte_data(client, reg, data->in[sf][nr]);

	mutex_unlock(&data->update_lock);



	return err < 0 ? err : count;

}



static ssize_t show_temp(struct device *dev, struct device_attribute *devattr,

	char *buf)

{

	struct emc6w201_data *data = emc6w201_update_device(dev);

	int sf = to_sensor_dev_attr_2(devattr)->index;

	int nr = to_sensor_dev_attr_2(devattr)->nr;



	return sprintf(buf, "%d\n", (int)data->temp[sf][nr] * 1000);

}



static ssize_t set_temp(struct device *dev, struct device_attribute *devattr,

			const char *buf, size_t count)

{

	struct i2c_client *client = to_i2c_client(dev);

	struct emc6w201_data *data = i2c_get_clientdata(client);

	int sf = to_sensor_dev_attr_2(devattr)->index;

	int nr = to_sensor_dev_attr_2(devattr)->nr;

	int err;

	long val;

	u8 reg;



	err = strict_strtol(buf, 10, &val);

	if (err < 0)

		return err;



	val /= 1000;

	reg = (sf == min) ? EMC6W201_REG_TEMP_LOW(nr)

			  : EMC6W201_REG_TEMP_HIGH(nr);



	mutex_lock(&data->update_lock);

	data->temp[sf][nr] = SENSORS_LIMIT(val, -127, 128);

	err = i2c_smbus_write_byte_data(client, reg, data->temp[sf][nr]);

	mutex_unlock(&data->update_lock);



	return err < 0 ? err : count;

}



static ssize_t show_fan(struct device *dev, struct device_attribute *devattr,

	char *buf)

{

	struct emc6w201_data *data = emc6w201_update_device(dev);

	int sf = to_sensor_dev_attr_2(devattr)->index;

	int nr = to_sensor_dev_attr_2(devattr)->nr;

	unsigned rpm;



	if (data->fan[sf][nr] == 0 || data->fan[sf][nr] == 0xFFFF)

		rpm = 0;

	else

		rpm = 5400000U / data->fan[sf][nr];



	return sprintf(buf, "%u\n", rpm);

}



static ssize_t set_fan(struct device *dev, struct device_attribute *devattr,

		       const char *buf, size_t count)

{

	struct i2c_client *client = to_i2c_client(dev);

	struct emc6w201_data *data = i2c_get_clientdata(client);

	int sf = to_sensor_dev_attr_2(devattr)->index;

	int nr = to_sensor_dev_attr_2(devattr)->nr;

	int err;

	unsigned long val;



	err = strict_strtoul(buf, 10, &val);

	if (err < 0)

		return err;



	if (val == 0) {

		val = 0xFFFF;

	} else {

		val = DIV_ROUND_CLOSEST(5400000U, val);

		val = SENSORS_LIMIT(val, 0, 0xFFFE);

	}



	mutex_lock(&data->update_lock);

	data->fan[sf][nr] = val;

	err = emc6w201_write16(client, EMC6W201_REG_FAN_MIN(nr),

			       data->fan[sf][nr]);

	mutex_unlock(&data->update_lock);



	return err < 0 ? err : count;

}



static SENSOR_DEVICE_ATTR_2(in0_input, S_IRUGO, show_in, NULL, 0, input);

static SENSOR_DEVICE_ATTR_2(in0_min, S_IRUGO | S_IWUSR, show_in, set_in,

			    0, min);

static SENSOR_DEVICE_ATTR_2(in0_max, S_IRUGO | S_IWUSR, show_in, set_in,

			    0, max);

static SENSOR_DEVICE_ATTR_2(in1_input, S_IRUGO, show_in, NULL, 1, input);

static SENSOR_DEVICE_ATTR_2(in1_min, S_IRUGO | S_IWUSR, show_in, set_in,

			    1, min);

static SENSOR_DEVICE_ATTR_2(in1_max, S_IRUGO | S_IWUSR, show_in, set_in,

			    1, max);

static SENSOR_DEVICE_ATTR_2(in2_input, S_IRUGO, show_in, NULL, 2, input);

static SENSOR_DEVICE_ATTR_2(in2_min, S_IRUGO | S_IWUSR, show_in, set_in,

			    2, min);

static SENSOR_DEVICE_ATTR_2(in2_max, S_IRUGO | S_IWUSR, show_in, set_in,

			    2, max);

static SENSOR_DEVICE_ATTR_2(in3_input, S_IRUGO, show_in, NULL, 3, input);

static SENSOR_DEVICE_ATTR_2(in3_min, S_IRUGO | S_IWUSR, show_in, set_in,

			    3, min);

static SENSOR_DEVICE_ATTR_2(in3_max, S_IRUGO | S_IWUSR, show_in, set_in,

			    3, max);

static SENSOR_DEVICE_ATTR_2(in4_input, S_IRUGO, show_in, NULL, 4, input);

static SENSOR_DEVICE_ATTR_2(in4_min, S_IRUGO | S_IWUSR, show_in, set_in,

			    4, min);

static SENSOR_DEVICE_ATTR_2(in4_max, S_IRUGO | S_IWUSR, show_in, set_in,

			    4, max);

static SENSOR_DEVICE_ATTR_2(in5_input, S_IRUGO, show_in, NULL, 5, input);

static SENSOR_DEVICE_ATTR_2(in5_min, S_IRUGO | S_IWUSR, show_in, set_in,

			    5, min);

static SENSOR_DEVICE_ATTR_2(in5_max, S_IRUGO | S_IWUSR, show_in, set_in,

			    5, max);



static SENSOR_DEVICE_ATTR_2(temp1_input, S_IRUGO, show_temp, NULL, 0, input);

static SENSOR_DEVICE_ATTR_2(temp1_min, S_IRUGO | S_IWUSR, show_temp, set_temp,

			    0, min);

static SENSOR_DEVICE_ATTR_2(temp1_max, S_IRUGO | S_IWUSR, show_temp, set_temp,

			    0, max);

static SENSOR_DEVICE_ATTR_2(temp2_input, S_IRUGO, show_temp, NULL, 1, input);

static SENSOR_DEVICE_ATTR_2(temp2_min, S_IRUGO | S_IWUSR, show_temp, set_temp,

			    1, min);

static SENSOR_DEVICE_ATTR_2(temp2_max, S_IRUGO | S_IWUSR, show_temp, set_temp,

			    1, max);

static SENSOR_DEVICE_ATTR_2(temp3_input, S_IRUGO, show_temp, NULL, 2, input);

static SENSOR_DEVICE_ATTR_2(temp3_min, S_IRUGO | S_IWUSR, show_temp, set_temp,

			    2, min);

static SENSOR_DEVICE_ATTR_2(temp3_max, S_IRUGO | S_IWUSR, show_temp, set_temp,

			    2, max);

static SENSOR_DEVICE_ATTR_2(temp4_input, S_IRUGO, show_temp, NULL, 3, input);

static SENSOR_DEVICE_ATTR_2(temp4_min, S_IRUGO | S_IWUSR, show_temp, set_temp,

			    3, min);

static SENSOR_DEVICE_ATTR_2(temp4_max, S_IRUGO | S_IWUSR, show_temp, set_temp,

			    3, max);

static SENSOR_DEVICE_ATTR_2(temp5_input, S_IRUGO, show_temp, NULL, 4, input);

static SENSOR_DEVICE_ATTR_2(temp5_min, S_IRUGO | S_IWUSR, show_temp, set_temp,

			    4, min);

static SENSOR_DEVICE_ATTR_2(temp5_max, S_IRUGO | S_IWUSR, show_temp, set_temp,

			    4, max);

static SENSOR_DEVICE_ATTR_2(temp6_input, S_IRUGO, show_temp, NULL, 5, input);

static SENSOR_DEVICE_ATTR_2(temp6_min, S_IRUGO | S_IWUSR, show_temp, set_temp,

			    5, min);

static SENSOR_DEVICE_ATTR_2(temp6_max, S_IRUGO | S_IWUSR, show_temp, set_temp,

			    5, max);



static SENSOR_DEVICE_ATTR_2(fan1_input, S_IRUGO, show_fan, NULL, 0, input);

static SENSOR_DEVICE_ATTR_2(fan1_min, S_IRUGO | S_IWUSR, show_fan, set_fan,

			    0, min);

static SENSOR_DEVICE_ATTR_2(fan2_input, S_IRUGO, show_fan, NULL, 1, input);

static SENSOR_DEVICE_ATTR_2(fan2_min, S_IRUGO | S_IWUSR, show_fan, set_fan,

			    1, min);

static SENSOR_DEVICE_ATTR_2(fan3_input, S_IRUGO, show_fan, NULL, 2, input);

static SENSOR_DEVICE_ATTR_2(fan3_min, S_IRUGO | S_IWUSR, show_fan, set_fan,

			    2, min);

static SENSOR_DEVICE_ATTR_2(fan4_input, S_IRUGO, show_fan, NULL, 3, input);

static SENSOR_DEVICE_ATTR_2(fan4_min, S_IRUGO | S_IWUSR, show_fan, set_fan,

			    3, min);

static SENSOR_DEVICE_ATTR_2(fan5_input, S_IRUGO, show_fan, NULL, 4, input);

static SENSOR_DEVICE_ATTR_2(fan5_min, S_IRUGO | S_IWUSR, show_fan, set_fan,

			    4, min);



static struct attribute *emc6w201_attributes[] = {

	&sensor_dev_attr_in0_input.dev_attr.attr,

	&sensor_dev_attr_in0_min.dev_attr.attr,

	&sensor_dev_attr_in0_max.dev_attr.attr,

	&sensor_dev_attr_in1_input.dev_attr.attr,

	&sensor_dev_attr_in1_min.dev_attr.attr,

	&sensor_dev_attr_in1_max.dev_attr.attr,

	&sensor_dev_attr_in2_input.dev_attr.attr,

	&sensor_dev_attr_in2_min.dev_attr.attr,

	&sensor_dev_attr_in2_max.dev_attr.attr,

	&sensor_dev_attr_in3_input.dev_attr.attr,

	&sensor_dev_attr_in3_min.dev_attr.attr,

	&sensor_dev_attr_in3_max.dev_attr.attr,

	&sensor_dev_attr_in4_input.dev_attr.attr,

	&sensor_dev_attr_in4_min.dev_attr.attr,

	&sensor_dev_attr_in4_max.dev_attr.attr,

	&sensor_dev_attr_in5_input.dev_attr.attr,

	&sensor_dev_attr_in5_min.dev_attr.attr,

	&sensor_dev_attr_in5_max.dev_attr.attr,



	&sensor_dev_attr_temp1_input.dev_attr.attr,

	&sensor_dev_attr_temp1_min.dev_attr.attr,

	&sensor_dev_attr_temp1_max.dev_attr.attr,

	&sensor_dev_attr_temp2_input.dev_attr.attr,

	&sensor_dev_attr_temp2_min.dev_attr.attr,

	&sensor_dev_attr_temp2_max.dev_attr.attr,

	&sensor_dev_attr_temp3_input.dev_attr.attr,

	&sensor_dev_attr_temp3_min.dev_attr.attr,

	&sensor_dev_attr_temp3_max.dev_attr.attr,

	&sensor_dev_attr_temp4_input.dev_attr.attr,

	&sensor_dev_attr_temp4_min.dev_attr.attr,

	&sensor_dev_attr_temp4_max.dev_attr.attr,

	&sensor_dev_attr_temp5_input.dev_attr.attr,

	&sensor_dev_attr_temp5_min.dev_attr.attr,

	&sensor_dev_attr_temp5_max.dev_attr.attr,

	&sensor_dev_attr_temp6_input.dev_attr.attr,

	&sensor_dev_attr_temp6_min.dev_attr.attr,

	&sensor_dev_attr_temp6_max.dev_attr.attr,



	&sensor_dev_attr_fan1_input.dev_attr.attr,

	&sensor_dev_attr_fan1_min.dev_attr.attr,

	&sensor_dev_attr_fan2_input.dev_attr.attr,

	&sensor_dev_attr_fan2_min.dev_attr.attr,

	&sensor_dev_attr_fan3_input.dev_attr.attr,

	&sensor_dev_attr_fan3_min.dev_attr.attr,

	&sensor_dev_attr_fan4_input.dev_attr.attr,

	&sensor_dev_attr_fan4_min.dev_attr.attr,

	&sensor_dev_attr_fan5_input.dev_attr.attr,

	&sensor_dev_attr_fan5_min.dev_attr.attr,

	NULL

};



static const struct attribute_group emc6w201_group = {

	.attrs = emc6w201_attributes,

};



/*

 * Driver interface

 */



/* Return 0 if detection is successful, -ENODEV otherwise */

static int emc6w201_detect(struct i2c_client *client,

			   struct i2c_board_info *info)

{

	struct i2c_adapter *adapter = client->adapter;

	int company, verstep, config;



	if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))

		return -ENODEV;



	/* Identification */

	company = i2c_smbus_read_byte_data(client, EMC6W201_REG_COMPANY);

	if (company != 0x5C)

		return -ENODEV;

	verstep = i2c_smbus_read_byte_data(client, EMC6W201_REG_VERSTEP);

	if (verstep < 0 || (verstep & 0xF0) != 0xB0)

		return -ENODEV;

	if ((verstep & 0x0F) > 2) {

		dev_dbg(&client->dev, "Unknwown EMC6W201 stepping %d\n",

			verstep & 0x0F);

		return -ENODEV;

	}



	/* Check configuration */

	config = i2c_smbus_read_byte_data(client, EMC6W201_REG_CONFIG);

	if ((config & 0xF4) != 0x04)

		return -ENODEV;

	if (!(config & 0x01)) {

		dev_err(&client->dev, "Monitoring not enabled\n");

		return -ENODEV;

	}



	strlcpy(info->type, "emc6w201", I2C_NAME_SIZE);



	return 0;

}



static int emc6w201_probe(struct i2c_client *client,

			  const struct i2c_device_id *id)

{

	struct emc6w201_data *data;

	int err;



	data = kzalloc(sizeof(struct emc6w201_data), GFP_KERNEL);

	if (!data) {

		err = -ENOMEM;

		goto exit;

	}



	i2c_set_clientdata(client, data);

	mutex_init(&data->update_lock);



	/* Create sysfs attribute */

	err = sysfs_create_group(&client->dev.kobj, &emc6w201_group);

	if (err)

		goto exit_free;



	/* Expose as a hwmon device */

	data->hwmon_dev = hwmon_device_register(&client->dev);

	if (IS_ERR(data->hwmon_dev)) {

		err = PTR_ERR(data->hwmon_dev);

		goto exit_remove;

	}



	return 0;



 exit_remove:

	sysfs_remove_group(&client->dev.kobj, &emc6w201_group);

 exit_free:

	kfree(data);

 exit:

	return err;

}



static int emc6w201_remove(struct i2c_client *client)

{

	struct emc6w201_data *data = i2c_get_clientdata(client);



	hwmon_device_unregister(data->hwmon_dev);

	sysfs_remove_group(&client->dev.kobj, &emc6w201_group);

	kfree(data);



	return 0;

}



static const struct i2c_device_id emc6w201_id[] = {

	{ "emc6w201", 0 },

	{ }

};

MODULE_DEVICE_TABLE(i2c, emc6w201_id);



static struct i2c_driver emc6w201_driver = {

	.class		= I2C_CLASS_HWMON,

	.driver = {

		.name	= "emc6w201",

	},

	.probe		= emc6w201_probe,

	.remove		= emc6w201_remove,

	.id_table	= emc6w201_id,

	.detect		= emc6w201_detect,

	.address_list	= normal_i2c,

};



static int __init sensors_emc6w201_init(void)

{

	return i2c_add_driver(&emc6w201_driver);

}

module_init(sensors_emc6w201_init);



static void __exit sensors_emc6w201_exit(void)

{

	i2c_del_driver(&emc6w201_driver);

}

module_exit(sensors_emc6w201_exit);



MODULE_AUTHOR("Jean Delvare <khali@linux-fr.org>");

MODULE_DESCRIPTION("SMSC EMC6W201 hardware monitoring driver");

MODULE_LICENSE("GPL");

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