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/*

    smsc47m192.c - Support for hardware monitoring block of

                   SMSC LPC47M192 and compatible Super I/O chips

    Copyright (C) 2006  Hartmut Rick <linux@rick.claranet.de>

    Derived from lm78.c and other chip drivers.

    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/hwmon-vid.h>

#include <linux/err.h>

#include <linux/sysfs.h>

#include <linux/mutex.h>

/* Addresses to scan */

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

/* Insmod parameters */

I2C_CLIENT_INSMOD_1(smsc47m192);

/* SMSC47M192 registers */

#define SMSC47M192_REG_IN(nr)           ((nr)<6 ? (0x20 + (nr)) : \

                                        (0x50 + (nr) - 6))

#define SMSC47M192_REG_IN_MAX(nr)       ((nr)<6 ? (0x2b + (nr) * 2) : \

                                        (0x54 + (((nr) - 6) * 2)))

#define SMSC47M192_REG_IN_MIN(nr)       ((nr)<6 ? (0x2c + (nr) * 2) : \

                                        (0x55 + (((nr) - 6) * 2)))

static u8 SMSC47M192_REG_TEMP[3] =      { 0x27, 0x26, 0x52 };

static u8 SMSC47M192_REG_TEMP_MAX[3] =  { 0x39, 0x37, 0x58 };

static u8 SMSC47M192_REG_TEMP_MIN[3] =  { 0x3A, 0x38, 0x59 };

#define SMSC47M192_REG_TEMP_OFFSET(nr)  ((nr)==2 ? 0x1e : 0x1f)

#define SMSC47M192_REG_ALARM1           0x41

#define SMSC47M192_REG_ALARM2           0x42

#define SMSC47M192_REG_VID              0x47

#define SMSC47M192_REG_VID4             0x49

#define SMSC47M192_REG_CONFIG           0x40

#define SMSC47M192_REG_SFR              0x4f

#define SMSC47M192_REG_COMPANY_ID       0x3e

#define SMSC47M192_REG_VERSION          0x3f

/* generalised scaling with integer rounding */

static inline int SCALE(long val, int mul, int div)

{

        if (val < 0)

                return (val * mul - div / 2) / div;

        else

                return (val * mul + div / 2) / div;

}

/* Conversions */

/* smsc47m192 internally scales voltage measurements */

static const u16 nom_mv[] = { 2500, 2250, 3300, 5000, 12000, 3300, 1500, 1800 };

static inline unsigned int IN_FROM_REG(u8 reg, int n)

{

        return SCALE(reg, nom_mv[n], 192);

}

static inline u8 IN_TO_REG(unsigned long val, int n)

{

        return SENSORS_LIMIT(SCALE(val, 192, nom_mv[n]), 0, 255);

}

/* TEMP: 0.001 degC units (-128C to +127C)

   REG: 1C/bit, two's complement */

static inline s8 TEMP_TO_REG(int val)

{

        return SENSORS_LIMIT(SCALE(val, 1, 1000), -128000, 127000);

}

static inline int TEMP_FROM_REG(s8 val)

{

        return val * 1000;

}

struct smsc47m192_data {

        struct i2c_client client;

        struct device *hwmon_dev;

        struct mutex update_lock;

        char valid;             /* !=0 if following fields are valid */

        unsigned long last_updated;     /* In jiffies */

        u8 in[8];               /* Register value */

        u8 in_max[8];           /* Register value */

        u8 in_min[8];           /* Register value */

        s8 temp[3];             /* Register value */

        s8 temp_max[3];         /* Register value */

        s8 temp_min[3];         /* Register value */

        s8 temp_offset[3];      /* Register value */

        u16 alarms;             /* Register encoding, combined */

        u8 vid;                 /* Register encoding, combined */

        u8 vrm;

};

static int smsc47m192_attach_adapter(struct i2c_adapter *adapter);

static int smsc47m192_detect(struct i2c_adapter *adapter, int address,

                int kind);

static int smsc47m192_detach_client(struct i2c_client *client);

static struct smsc47m192_data *smsc47m192_update_device(struct device *dev);

static struct i2c_driver smsc47m192_driver = {

        .driver = {

                .name   = "smsc47m192",

        },

        .attach_adapter = smsc47m192_attach_adapter,

        .detach_client  = smsc47m192_detach_client,

};

/* Voltages */

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

                char *buf)

{

        struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);

        int nr = sensor_attr->index;

        struct smsc47m192_data *data = smsc47m192_update_device(dev);

        return sprintf(buf, "%d\n", IN_FROM_REG(data->in[nr], nr));

}

static ssize_t show_in_min(struct device *dev, struct device_attribute *attr,

                char *buf)

{

        struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);

        int nr = sensor_attr->index;

        struct smsc47m192_data *data = smsc47m192_update_device(dev);

        return sprintf(buf, "%d\n", IN_FROM_REG(data->in_min[nr], nr));

}

static ssize_t show_in_max(struct device *dev, struct device_attribute *attr,

                char *buf)

{

        struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);

        int nr = sensor_attr->index;

        struct smsc47m192_data *data = smsc47m192_update_device(dev);

        return sprintf(buf, "%d\n", IN_FROM_REG(data->in_max[nr], nr));

}

static ssize_t set_in_min(struct device *dev, struct device_attribute *attr,

                const char *buf, size_t count)

{

        struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);

        int nr = sensor_attr->index;

        struct i2c_client *client = to_i2c_client(dev);

        struct smsc47m192_data *data = i2c_get_clientdata(client);

        unsigned long val = simple_strtoul(buf, NULL, 10);

        mutex_lock(&data->update_lock);

        data->in_min[nr] = IN_TO_REG(val, nr);

        i2c_smbus_write_byte_data(client, SMSC47M192_REG_IN_MIN(nr),

                                                        data->in_min[nr]);

        mutex_unlock(&data->update_lock);

        return count;

}

static ssize_t set_in_max(struct device *dev, struct device_attribute *attr,

                const char *buf, size_t count)

{

        struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);

        int nr = sensor_attr->index;

        struct i2c_client *client = to_i2c_client(dev);

        struct smsc47m192_data *data = i2c_get_clientdata(client);

        unsigned long val = simple_strtoul(buf, NULL, 10);

        mutex_lock(&data->update_lock);

        data->in_max[nr] = IN_TO_REG(val, nr);

        i2c_smbus_write_byte_data(client, SMSC47M192_REG_IN_MAX(nr),

                                                        data->in_max[nr]);

        mutex_unlock(&data->update_lock);

        return count;

}

#define show_in_offset(offset)                                  \

static SENSOR_DEVICE_ATTR(in##offset##_input, S_IRUGO,          \

                show_in, NULL, offset);                         \

static SENSOR_DEVICE_ATTR(in##offset##_min, S_IRUGO | S_IWUSR,  \

                show_in_min, set_in_min, offset);               \

static SENSOR_DEVICE_ATTR(in##offset##_max, S_IRUGO | S_IWUSR,  \

                show_in_max, set_in_max, offset);

show_in_offset(0)

show_in_offset(1)

show_in_offset(2)

show_in_offset(3)

show_in_offset(4)

show_in_offset(5)

show_in_offset(6)

show_in_offset(7)

/* Temperatures */

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

                char *buf)

{

        struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);

        int nr = sensor_attr->index;

        struct smsc47m192_data *data = smsc47m192_update_device(dev);

        return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp[nr]));

}

static ssize_t show_temp_min(struct device *dev, struct device_attribute *attr,

                char *buf)

{

        struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);

        int nr = sensor_attr->index;

        struct smsc47m192_data *data = smsc47m192_update_device(dev);

        return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp_min[nr]));

}

static ssize_t show_temp_max(struct device *dev, struct device_attribute *attr,

                char *buf)

{

        struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);

        int nr = sensor_attr->index;

        struct smsc47m192_data *data = smsc47m192_update_device(dev);

        return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp_max[nr]));

}

static ssize_t set_temp_min(struct device *dev, struct device_attribute *attr,

                const char *buf, size_t count)

{

        struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);

        int nr = sensor_attr->index;

        struct i2c_client *client = to_i2c_client(dev);

        struct smsc47m192_data *data = i2c_get_clientdata(client);

        long val = simple_strtol(buf, NULL, 10);

        mutex_lock(&data->update_lock);

        data->temp_min[nr] = TEMP_TO_REG(val);

        i2c_smbus_write_byte_data(client, SMSC47M192_REG_TEMP_MIN[nr],

                                                data->temp_min[nr]);

        mutex_unlock(&data->update_lock);

        return count;

}

static ssize_t set_temp_max(struct device *dev, struct device_attribute *attr,

                const char *buf, size_t count)

{

        struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);

        int nr = sensor_attr->index;

        struct i2c_client *client = to_i2c_client(dev);

        struct smsc47m192_data *data = i2c_get_clientdata(client);

        long val = simple_strtol(buf, NULL, 10);

        mutex_lock(&data->update_lock);

        data->temp_max[nr] = TEMP_TO_REG(val);

        i2c_smbus_write_byte_data(client, SMSC47M192_REG_TEMP_MAX[nr],

                                                data->temp_max[nr]);

        mutex_unlock(&data->update_lock);

        return count;

}

static ssize_t show_temp_offset(struct device *dev, struct device_attribute

                *attr, char *buf)

{

        struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);

        int nr = sensor_attr->index;

        struct smsc47m192_data *data = smsc47m192_update_device(dev);

        return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp_offset[nr]));

}

static ssize_t set_temp_offset(struct device *dev, struct device_attribute

                *attr, const char *buf, size_t count)

{

        struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);

        int nr = sensor_attr->index;

        struct i2c_client *client = to_i2c_client(dev);

        struct smsc47m192_data *data = i2c_get_clientdata(client);

        u8 sfr = i2c_smbus_read_byte_data(client, SMSC47M192_REG_SFR);

        long val = simple_strtol(buf, NULL, 10);

        mutex_lock(&data->update_lock);

        data->temp_offset[nr] = TEMP_TO_REG(val);

        if (nr>1)

                i2c_smbus_write_byte_data(client,

                        SMSC47M192_REG_TEMP_OFFSET(nr), data->temp_offset[nr]);

        else if (data->temp_offset[nr] != 0) {

                /* offset[0] and offset[1] share the same register,

                        SFR bit 4 activates offset[0] */

                i2c_smbus_write_byte_data(client, SMSC47M192_REG_SFR,

                                        (sfr & 0xef) | (nr==0 ? 0x10 : 0));

                data->temp_offset[1-nr] = 0;

                i2c_smbus_write_byte_data(client,

                        SMSC47M192_REG_TEMP_OFFSET(nr), data->temp_offset[nr]);

        } else if ((sfr & 0x10) == (nr==0 ? 0x10 : 0))

                i2c_smbus_write_byte_data(client,

                                        SMSC47M192_REG_TEMP_OFFSET(nr), 0);

        mutex_unlock(&data->update_lock);

        return count;

}

#define show_temp_index(index)                                          \

static SENSOR_DEVICE_ATTR(temp##index##_input, S_IRUGO,                 \

                show_temp, NULL, index-1);                              \

static SENSOR_DEVICE_ATTR(temp##index##_min, S_IRUGO | S_IWUSR,         \

                show_temp_min, set_temp_min, index-1);                  \

static SENSOR_DEVICE_ATTR(temp##index##_max, S_IRUGO | S_IWUSR,         \

                show_temp_max, set_temp_max, index-1);                  \

static SENSOR_DEVICE_ATTR(temp##index##_offset, S_IRUGO | S_IWUSR,      \

                show_temp_offset, set_temp_offset, index-1);

show_temp_index(1)

show_temp_index(2)

show_temp_index(3)

/* VID */

static ssize_t show_vid(struct device *dev, struct device_attribute *attr,

                char *buf)

{

        struct smsc47m192_data *data = smsc47m192_update_device(dev);

        return sprintf(buf, "%d\n", vid_from_reg(data->vid, data->vrm));

}

static DEVICE_ATTR(cpu0_vid, S_IRUGO, show_vid, NULL);

static ssize_t show_vrm(struct device *dev, struct device_attribute *attr,

                char *buf)

{

        struct smsc47m192_data *data = dev_get_drvdata(dev);

        return sprintf(buf, "%d\n", data->vrm);

}

static ssize_t set_vrm(struct device *dev, struct device_attribute *attr,

                const char *buf, size_t count)

{

        struct i2c_client *client = to_i2c_client(dev);

        struct smsc47m192_data *data = i2c_get_clientdata(client);

        data->vrm = simple_strtoul(buf, NULL, 10);

        return count;

}

static DEVICE_ATTR(vrm, S_IRUGO | S_IWUSR, show_vrm, set_vrm);

/* Alarms */

static ssize_t show_alarm(struct device *dev, struct device_attribute *attr,

                char *buf)

{

        struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);

        int nr = sensor_attr->index;

        struct smsc47m192_data *data = smsc47m192_update_device(dev);

        return sprintf(buf, "%u\n", (data->alarms & nr) ? 1 : 0);

}

static SENSOR_DEVICE_ATTR(temp1_alarm, S_IRUGO, show_alarm, NULL, 0x0010);

static SENSOR_DEVICE_ATTR(temp2_alarm, S_IRUGO, show_alarm, NULL, 0x0020);

static SENSOR_DEVICE_ATTR(temp3_alarm, S_IRUGO, show_alarm, NULL, 0x0040);

static SENSOR_DEVICE_ATTR(temp2_fault, S_IRUGO, show_alarm, NULL, 0x4000);

static SENSOR_DEVICE_ATTR(temp3_fault, S_IRUGO, show_alarm, NULL, 0x8000);

static SENSOR_DEVICE_ATTR(in0_alarm, S_IRUGO, show_alarm, NULL, 0x0001);

static SENSOR_DEVICE_ATTR(in1_alarm, S_IRUGO, show_alarm, NULL, 0x0002);

static SENSOR_DEVICE_ATTR(in2_alarm, S_IRUGO, show_alarm, NULL, 0x0004);

static SENSOR_DEVICE_ATTR(in3_alarm, S_IRUGO, show_alarm, NULL, 0x0008);

static SENSOR_DEVICE_ATTR(in4_alarm, S_IRUGO, show_alarm, NULL, 0x0100);

static SENSOR_DEVICE_ATTR(in5_alarm, S_IRUGO, show_alarm, NULL, 0x0200);

static SENSOR_DEVICE_ATTR(in6_alarm, S_IRUGO, show_alarm, NULL, 0x0400);

static SENSOR_DEVICE_ATTR(in7_alarm, S_IRUGO, show_alarm, NULL, 0x0800);

static struct attribute *smsc47m192_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_in0_alarm.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_in1_alarm.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_in2_alarm.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_in3_alarm.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_in5_alarm.dev_attr.attr,

        &sensor_dev_attr_in6_input.dev_attr.attr,

        &sensor_dev_attr_in6_min.dev_attr.attr,

        &sensor_dev_attr_in6_max.dev_attr.attr,

        &sensor_dev_attr_in6_alarm.dev_attr.attr,

        &sensor_dev_attr_in7_input.dev_attr.attr,

        &sensor_dev_attr_in7_min.dev_attr.attr,

        &sensor_dev_attr_in7_max.dev_attr.attr,

        &sensor_dev_attr_in7_alarm.dev_attr.attr,

        &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_offset.dev_attr.attr,

        &sensor_dev_attr_temp1_alarm.dev_attr.attr,

        &sensor_dev_attr_temp2_input.dev_attr.attr,

        &sensor_dev_attr_temp2_max.dev_attr.attr,

        &sensor_dev_attr_temp2_min.dev_attr.attr,

        &sensor_dev_attr_temp2_offset.dev_attr.attr,

        &sensor_dev_attr_temp2_alarm.dev_attr.attr,

        &sensor_dev_attr_temp2_fault.dev_attr.attr,

        &sensor_dev_attr_temp3_input.dev_attr.attr,

        &sensor_dev_attr_temp3_max.dev_attr.attr,

        &sensor_dev_attr_temp3_min.dev_attr.attr,

        &sensor_dev_attr_temp3_offset.dev_attr.attr,

        &sensor_dev_attr_temp3_alarm.dev_attr.attr,

        &sensor_dev_attr_temp3_fault.dev_attr.attr,

        &dev_attr_cpu0_vid.attr,

        &dev_attr_vrm.attr,

        NULL

};

static const struct attribute_group smsc47m192_group = {

        .attrs = smsc47m192_attributes,

};

static struct attribute *smsc47m192_attributes_in4[] = {

        &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_in4_alarm.dev_attr.attr,

        NULL

};

static const struct attribute_group smsc47m192_group_in4 = {

        .attrs = smsc47m192_attributes_in4,

};

/* This function is called when:

    * smsc47m192_driver is inserted (when this module is loaded), for each

      available adapter

    * when a new adapter is inserted (and smsc47m192_driver is still present) */

static int smsc47m192_attach_adapter(struct i2c_adapter *adapter)

{

        if (!(adapter->class & I2C_CLASS_HWMON))

                return 0;

        return i2c_probe(adapter, &addr_data, smsc47m192_detect);

}

static void smsc47m192_init_client(struct i2c_client *client)

{

        int i;

        u8 config = i2c_smbus_read_byte_data(client, SMSC47M192_REG_CONFIG);

        u8 sfr = i2c_smbus_read_byte_data(client, SMSC47M192_REG_SFR);

        /* select cycle mode (pause 1 sec between updates) */

        i2c_smbus_write_byte_data(client, SMSC47M192_REG_SFR,

                                                (sfr & 0xfd) | 0x02);

        if (!(config & 0x01)) {

                /* initialize alarm limits */

                for (i=0; i<8; i++) {

                        i2c_smbus_write_byte_data(client,

                                SMSC47M192_REG_IN_MIN(i), 0);

                        i2c_smbus_write_byte_data(client,

                                SMSC47M192_REG_IN_MAX(i), 0xff);

                }

                for (i=0; i<3; i++) {

                        i2c_smbus_write_byte_data(client,

                                SMSC47M192_REG_TEMP_MIN[i], 0x80);

                        i2c_smbus_write_byte_data(client,

                                SMSC47M192_REG_TEMP_MAX[i], 0x7f);

                }

                /* start monitoring */

                i2c_smbus_write_byte_data(client, SMSC47M192_REG_CONFIG,

                                                (config & 0xf7) | 0x01);

        }

}

/* This function is called by i2c_probe */

static int smsc47m192_detect(struct i2c_adapter *adapter, int address,

                int kind)

{

        struct i2c_client *client;

        struct smsc47m192_data *data;

        int err = 0;

        int version, config;

        if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))

                goto exit;

        if (!(data = kzalloc(sizeof(struct smsc47m192_data), GFP_KERNEL))) {

                err = -ENOMEM;

                goto exit;

        }

        client = &data->client;

        i2c_set_clientdata(client, data);

        client->addr = address;

        client->adapter = adapter;

        client->driver = &smsc47m192_driver;

        if (kind == 0)

                kind = smsc47m192;

        /* Detection criteria from sensors_detect script */

        if (kind < 0) {

                if (i2c_smbus_read_byte_data(client,

                                SMSC47M192_REG_COMPANY_ID) == 0x55

                 && ((version = i2c_smbus_read_byte_data(client,

                                SMSC47M192_REG_VERSION)) & 0xf0) == 0x20

                 && (i2c_smbus_read_byte_data(client,

                                SMSC47M192_REG_VID) & 0x70) == 0x00

                 && (i2c_smbus_read_byte_data(client,

                                SMSC47M192_REG_VID4) & 0xfe) == 0x80) {

                        dev_info(&adapter->dev,

                                 "found SMSC47M192 or compatible, "

                                 "version 2, stepping A%d\n", version & 0x0f);

                } else {

                        dev_dbg(&adapter->dev,

                                "SMSC47M192 detection failed at 0x%02x\n",

                                address);

                        goto exit_free;

                }

        }

        /* Fill in the remaining client fields and put into the global list */

        strlcpy(client->name, "smsc47m192", I2C_NAME_SIZE);

        data->vrm = vid_which_vrm();

        mutex_init(&data->update_lock);

        /* Tell the I2C layer a new client has arrived */

        if ((err = i2c_attach_client(client)))

                goto exit_free;

        /* Initialize the SMSC47M192 chip */

        smsc47m192_init_client(client);

        /* Register sysfs hooks */

        if ((err = sysfs_create_group(&client->dev.kobj, &smsc47m192_group)))

                goto exit_detach;

        /* Pin 110 is either in4 (+12V) or VID4 */

        config = i2c_smbus_read_byte_data(client, SMSC47M192_REG_CONFIG);

        if (!(config & 0x20)) {

                if ((err = sysfs_create_group(&client->dev.kobj,

                                              &smsc47m192_group_in4)))

                        goto exit_remove_files;

        }

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

        if (IS_ERR(data->hwmon_dev)) {

                err = PTR_ERR(data->hwmon_dev);

                goto exit_remove_files;

        }

        return 0;

exit_remove_files:

        sysfs_remove_group(&client->dev.kobj, &smsc47m192_group);

        sysfs_remove_group(&client->dev.kobj, &smsc47m192_group_in4);

exit_detach:

        i2c_detach_client(client);

exit_free:

        kfree(data);

exit:

        return err;

}

static int smsc47m192_detach_client(struct i2c_client *client)

{

        struct smsc47m192_data *data = i2c_get_clientdata(client);

        int err;

        hwmon_device_unregister(data->hwmon_dev);

        sysfs_remove_group(&client->dev.kobj, &smsc47m192_group);

        sysfs_remove_group(&client->dev.kobj, &smsc47m192_group_in4);

        if ((err = i2c_detach_client(client)))

                return err;

        kfree(data);

        return 0;

}

static struct smsc47m192_data *smsc47m192_update_device(struct device *dev)

{

        struct i2c_client *client = to_i2c_client(dev);

        struct smsc47m192_data *data = i2c_get_clientdata(client);

        int i, config;

        mutex_lock(&data->update_lock);

        if (time_after(jiffies, data->last_updated + HZ + HZ / 2)

         || !data->valid) {

                u8 sfr = i2c_smbus_read_byte_data(client, SMSC47M192_REG_SFR);

                dev_dbg(&client->dev, "Starting smsc47m192 update\n");

                for (i = 0; i <= 7; i++) {

                        data->in[i] = i2c_smbus_read_byte_data(client,

                                                SMSC47M192_REG_IN(i));