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/*

    gl520sm.c - Part of lm_sensors, Linux kernel modules for hardware

                monitoring

    Copyright (c) 1998, 1999  Frodo Looijaard <frodol@dds.nl>,

                              Kyösti Mälkki <kmalkki@cc.hut.fi>

    Copyright (c) 2005        Maarten Deprez <maartendeprez@users.sourceforge.net>

    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-vid.h>

#include <linux/err.h>

#include <linux/mutex.h>

#include <linux/sysfs.h>

/* Type of the extra sensor */

static unsigned short extra_sensor_type;

module_param(extra_sensor_type, ushort, 0);

MODULE_PARM_DESC(extra_sensor_type, "Type of extra sensor (0=autodetect, 1=temperature, 2=voltage)");

/* Addresses to scan */

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

/* Insmod parameters */

I2C_CLIENT_INSMOD_1(gl520sm);

/* Many GL520 constants specified below

One of the inputs can be configured as either temp or voltage.

That's why _TEMP2 and _IN4 access the same register

*/

/* The GL520 registers */

#define GL520_REG_CHIP_ID               0x00

#define GL520_REG_REVISION              0x01

#define GL520_REG_CONF                  0x03

#define GL520_REG_MASK                  0x11

#define GL520_REG_VID_INPUT             0x02

#define GL520_REG_IN0_INPUT             0x15

#define GL520_REG_IN0_LIMIT             0x0c

#define GL520_REG_IN0_MIN               GL520_REG_IN0_LIMIT

#define GL520_REG_IN0_MAX               GL520_REG_IN0_LIMIT

#define GL520_REG_IN1_INPUT             0x14

#define GL520_REG_IN1_LIMIT             0x09

#define GL520_REG_IN1_MIN               GL520_REG_IN1_LIMIT

#define GL520_REG_IN1_MAX               GL520_REG_IN1_LIMIT

#define GL520_REG_IN2_INPUT             0x13

#define GL520_REG_IN2_LIMIT             0x0a

#define GL520_REG_IN2_MIN               GL520_REG_IN2_LIMIT

#define GL520_REG_IN2_MAX               GL520_REG_IN2_LIMIT

#define GL520_REG_IN3_INPUT             0x0d

#define GL520_REG_IN3_LIMIT             0x0b

#define GL520_REG_IN3_MIN               GL520_REG_IN3_LIMIT

#define GL520_REG_IN3_MAX               GL520_REG_IN3_LIMIT

#define GL520_REG_IN4_INPUT             0x0e

#define GL520_REG_IN4_MAX               0x17

#define GL520_REG_IN4_MIN               0x18

#define GL520_REG_TEMP1_INPUT           0x04

#define GL520_REG_TEMP1_MAX             0x05

#define GL520_REG_TEMP1_MAX_HYST        0x06

#define GL520_REG_TEMP2_INPUT           0x0e

#define GL520_REG_TEMP2_MAX             0x17

#define GL520_REG_TEMP2_MAX_HYST        0x18

#define GL520_REG_FAN_INPUT             0x07

#define GL520_REG_FAN_MIN               0x08

#define GL520_REG_FAN_DIV               0x0f

#define GL520_REG_FAN_OFF               GL520_REG_FAN_DIV

#define GL520_REG_ALARMS                0x12

#define GL520_REG_BEEP_MASK             0x10

#define GL520_REG_BEEP_ENABLE           GL520_REG_CONF

/*

 * Function declarations

 */

static int gl520_attach_adapter(struct i2c_adapter *adapter);

static int gl520_detect(struct i2c_adapter *adapter, int address, int kind);

static void gl520_init_client(struct i2c_client *client);

static int gl520_detach_client(struct i2c_client *client);

static int gl520_read_value(struct i2c_client *client, u8 reg);

static int gl520_write_value(struct i2c_client *client, u8 reg, u16 value);

static struct gl520_data *gl520_update_device(struct device *dev);

/* Driver data */

static struct i2c_driver gl520_driver = {

        .driver = {

                .name   = "gl520sm",

        },

        .id             = I2C_DRIVERID_GL520,

        .attach_adapter = gl520_attach_adapter,

        .detach_client  = gl520_detach_client,

};

/* Client data */

struct gl520_data {

        struct i2c_client client;

        struct device *hwmon_dev;

        struct mutex update_lock;

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

        unsigned long last_updated;     /* in jiffies */

        u8 vid;

        u8 vrm;

        u8 in_input[5];         /* [0] = VVD */

        u8 in_min[5];           /* [0] = VDD */

        u8 in_max[5];           /* [0] = VDD */

        u8 fan_input[2];

        u8 fan_min[2];

        u8 fan_div[2];

        u8 fan_off;

        u8 temp_input[2];

        u8 temp_max[2];

        u8 temp_max_hyst[2];

        u8 alarms;

        u8 beep_enable;

        u8 beep_mask;

        u8 alarm_mask;

        u8 two_temps;

};

/*

 * Sysfs stuff

 */

#define sysfs_r(type, n, item, reg) \

static ssize_t get_##type##item (struct gl520_data *, char *, int); \

static ssize_t get_##type##n##item (struct device *, struct device_attribute *attr, char *); \

static ssize_t get_##type##n##item (struct device *dev, struct device_attribute *attr, char *buf) \

{ \

        struct gl520_data *data = gl520_update_device(dev); \

        return get_##type##item(data, buf, (n)); \

}

#define sysfs_w(type, n, item, reg) \

static ssize_t set_##type##item (struct i2c_client *, struct gl520_data *, const char *, size_t, int, int); \

static ssize_t set_##type##n##item (struct device *, struct device_attribute *attr, const char *, size_t); \

static ssize_t set_##type##n##item (struct device *dev, struct device_attribute *attr, const char *buf, size_t count) \

{ \

        struct i2c_client *client = to_i2c_client(dev); \

        struct gl520_data *data = i2c_get_clientdata(client); \

        return set_##type##item(client, data, buf, count, (n), reg); \

}

#define sysfs_rw_n(type, n, item, reg) \

sysfs_r(type, n, item, reg) \

sysfs_w(type, n, item, reg) \

static DEVICE_ATTR(type##n##item, S_IRUGO | S_IWUSR, get_##type##n##item, set_##type##n##item);

#define sysfs_ro_n(type, n, item, reg) \

sysfs_r(type, n, item, reg) \

static DEVICE_ATTR(type##n##item, S_IRUGO, get_##type##n##item, NULL);

#define sysfs_rw(type, item, reg) \

sysfs_r(type, 0, item, reg) \

sysfs_w(type, 0, item, reg) \

static DEVICE_ATTR(type##item, S_IRUGO | S_IWUSR, get_##type##0##item, set_##type##0##item);

#define sysfs_ro(type, item, reg) \

sysfs_r(type, 0, item, reg) \

static DEVICE_ATTR(type##item, S_IRUGO, get_##type##0##item, NULL);

#define sysfs_vid(n) \

sysfs_ro_n(cpu, n, _vid, GL520_REG_VID_INPUT)

#define sysfs_in(n) \

sysfs_ro_n(in, n, _input, GL520_REG_IN##n##INPUT) \

sysfs_rw_n(in, n, _min, GL520_REG_IN##n##_MIN) \

sysfs_rw_n(in, n, _max, GL520_REG_IN##n##_MAX) \

#define sysfs_fan(n) \

sysfs_ro_n(fan, n, _input, GL520_REG_FAN_INPUT) \

sysfs_rw_n(fan, n, _min, GL520_REG_FAN_MIN) \

sysfs_rw_n(fan, n, _div, GL520_REG_FAN_DIV)

#define sysfs_fan_off(n) \

sysfs_rw_n(fan, n, _off, GL520_REG_FAN_OFF) \

#define sysfs_temp(n) \

sysfs_ro_n(temp, n, _input, GL520_REG_TEMP##n##_INPUT) \

sysfs_rw_n(temp, n, _max, GL520_REG_TEMP##n##_MAX) \

sysfs_rw_n(temp, n, _max_hyst, GL520_REG_TEMP##n##_MAX_HYST)

#define sysfs_alarms() \

sysfs_ro(alarms, , GL520_REG_ALARMS) \

sysfs_rw(beep_enable, , GL520_REG_BEEP_ENABLE) \

sysfs_rw(beep_mask, , GL520_REG_BEEP_MASK)

sysfs_vid(0)

sysfs_in(0)

sysfs_in(1)

sysfs_in(2)

sysfs_in(3)

sysfs_in(4)

sysfs_fan(1)

sysfs_fan(2)

sysfs_fan_off(1)

sysfs_temp(1)

sysfs_temp(2)

sysfs_alarms()

static ssize_t get_cpu_vid(struct gl520_data *data, char *buf, int n)

{

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

}

#define VDD_FROM_REG(val) (((val)*95+2)/4)

#define VDD_TO_REG(val) (SENSORS_LIMIT((((val)*4+47)/95),0,255))

#define IN_FROM_REG(val) ((val)*19)

#define IN_TO_REG(val) (SENSORS_LIMIT((((val)+9)/19),0,255))

static ssize_t get_in_input(struct gl520_data *data, char *buf, int n)

{

        u8 r = data->in_input[n];

        if (n == 0)

                return sprintf(buf, "%d\n", VDD_FROM_REG(r));

        else

                return sprintf(buf, "%d\n", IN_FROM_REG(r));

}

static ssize_t get_in_min(struct gl520_data *data, char *buf, int n)

{

        u8 r = data->in_min[n];

        if (n == 0)

                return sprintf(buf, "%d\n", VDD_FROM_REG(r));

        else

                return sprintf(buf, "%d\n", IN_FROM_REG(r));

}

static ssize_t get_in_max(struct gl520_data *data, char *buf, int n)

{

        u8 r = data->in_max[n];

        if (n == 0)

                return sprintf(buf, "%d\n", VDD_FROM_REG(r));

        else

                return sprintf(buf, "%d\n", IN_FROM_REG(r));

}

static ssize_t set_in_min(struct i2c_client *client, struct gl520_data *data, const char *buf, size_t count, int n, int reg)

{

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

        u8 r;

        mutex_lock(&data->update_lock);

        if (n == 0)

                r = VDD_TO_REG(v);

        else

                r = IN_TO_REG(v);

        data->in_min[n] = r;

        if (n < 4)

                gl520_write_value(client, reg, (gl520_read_value(client, reg) & ~0xff) | r);

        else

                gl520_write_value(client, reg, r);

        mutex_unlock(&data->update_lock);

        return count;

}

static ssize_t set_in_max(struct i2c_client *client, struct gl520_data *data, const char *buf, size_t count, int n, int reg)

{

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

        u8 r;

        if (n == 0)

                r = VDD_TO_REG(v);

        else

                r = IN_TO_REG(v);

        mutex_lock(&data->update_lock);

        data->in_max[n] = r;

        if (n < 4)

                gl520_write_value(client, reg, (gl520_read_value(client, reg) & ~0xff00) | (r << 8));

        else

                gl520_write_value(client, reg, r);

        mutex_unlock(&data->update_lock);

        return count;

}

#define DIV_FROM_REG(val) (1 << (val))

#define FAN_FROM_REG(val,div) ((val)==0 ? 0 : (480000/((val) << (div))))

#define FAN_TO_REG(val,div) ((val)<=0?0:SENSORS_LIMIT((480000 + ((val) << ((div)-1))) / ((val) << (div)), 1, 255));

static ssize_t get_fan_input(struct gl520_data *data, char *buf, int n)

{

        return sprintf(buf, "%d\n", FAN_FROM_REG(data->fan_input[n - 1], data->fan_div[n - 1]));

}

static ssize_t get_fan_min(struct gl520_data *data, char *buf, int n)

{

        return sprintf(buf, "%d\n", FAN_FROM_REG(data->fan_min[n - 1], data->fan_div[n - 1]));

}

static ssize_t get_fan_div(struct gl520_data *data, char *buf, int n)

{

        return sprintf(buf, "%d\n", DIV_FROM_REG(data->fan_div[n - 1]));

}

static ssize_t get_fan_off(struct gl520_data *data, char *buf, int n)

{

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

}

static ssize_t set_fan_min(struct i2c_client *client, struct gl520_data *data, const char *buf, size_t count, int n, int reg)

{

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

        u8 r;

        mutex_lock(&data->update_lock);

        r = FAN_TO_REG(v, data->fan_div[n - 1]);

        data->fan_min[n - 1] = r;

        if (n == 1)

                gl520_write_value(client, reg, (gl520_read_value(client, reg) & ~0xff00) | (r << 8));

        else

                gl520_write_value(client, reg, (gl520_read_value(client, reg) & ~0xff) | r);

        data->beep_mask = gl520_read_value(client, GL520_REG_BEEP_MASK);

        if (data->fan_min[n - 1] == 0)

                data->alarm_mask &= (n == 1) ? ~0x20 : ~0x40;

        else

                data->alarm_mask |= (n == 1) ? 0x20 : 0x40;

        data->beep_mask &= data->alarm_mask;

        gl520_write_value(client, GL520_REG_BEEP_MASK, data->beep_mask);

        mutex_unlock(&data->update_lock);

        return count;

}

static ssize_t set_fan_div(struct i2c_client *client, struct gl520_data *data, const char *buf, size_t count, int n, int reg)

{

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

        u8 r;

        switch (v) {

        case 1: r = 0; break;

        case 2: r = 1; break;

        case 4: r = 2; break;

        case 8: r = 3; break;

        default:

                dev_err(&client->dev, "fan_div value %ld not supported. Choose one of 1, 2, 4 or 8!\n", v);

                return -EINVAL;

        }

        mutex_lock(&data->update_lock);

        data->fan_div[n - 1] = r;

        if (n == 1)

                gl520_write_value(client, reg, (gl520_read_value(client, reg) & ~0xc0) | (r << 6));

        else

                gl520_write_value(client, reg, (gl520_read_value(client, reg) & ~0x30) | (r << 4));

        mutex_unlock(&data->update_lock);

        return count;

}

static ssize_t set_fan_off(struct i2c_client *client, struct gl520_data *data, const char *buf, size_t count, int n, int reg)

{

        u8 r = simple_strtoul(buf, NULL, 10)?1:0;

        mutex_lock(&data->update_lock);

        data->fan_off = r;

        gl520_write_value(client, reg, (gl520_read_value(client, reg) & ~0x0c) | (r << 2));

        mutex_unlock(&data->update_lock);

        return count;

}

#define TEMP_FROM_REG(val) (((val) - 130) * 1000)

#define TEMP_TO_REG(val) (SENSORS_LIMIT(((((val)<0?(val)-500:(val)+500) / 1000)+130),0,255))

static ssize_t get_temp_input(struct gl520_data *data, char *buf, int n)

{

        return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp_input[n - 1]));

}

static ssize_t get_temp_max(struct gl520_data *data, char *buf, int n)

{

        return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp_max[n - 1]));

}

static ssize_t get_temp_max_hyst(struct gl520_data *data, char *buf, int n)

{

        return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp_max_hyst[n - 1]));

}

static ssize_t set_temp_max(struct i2c_client *client, struct gl520_data *data, const char *buf, size_t count, int n, int reg)

{

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

        mutex_lock(&data->update_lock);

        data->temp_max[n - 1] = TEMP_TO_REG(v);

        gl520_write_value(client, reg, data->temp_max[n - 1]);

        mutex_unlock(&data->update_lock);

        return count;

}

static ssize_t set_temp_max_hyst(struct i2c_client *client, struct gl520_data *data, const char *buf, size_t count, int n, int reg)

{

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

        mutex_lock(&data->update_lock);

        data->temp_max_hyst[n - 1] = TEMP_TO_REG(v);

        gl520_write_value(client, reg, data->temp_max_hyst[n - 1]);

        mutex_unlock(&data->update_lock);

        return count;

}

static ssize_t get_alarms(struct gl520_data *data, char *buf, int n)

{

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

}

static ssize_t get_beep_enable(struct gl520_data *data, char *buf, int n)

{

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

}

static ssize_t get_beep_mask(struct gl520_data *data, char *buf, int n)

{

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

}

static ssize_t set_beep_enable(struct i2c_client *client, struct gl520_data *data, const char *buf, size_t count, int n, int reg)

{

        u8 r = simple_strtoul(buf, NULL, 10)?0:1;

        mutex_lock(&data->update_lock);

        data->beep_enable = !r;

        gl520_write_value(client, reg, (gl520_read_value(client, reg) & ~0x04) | (r << 2));

        mutex_unlock(&data->update_lock);

        return count;

}

static ssize_t set_beep_mask(struct i2c_client *client, struct gl520_data *data, const char *buf, size_t count, int n, int reg)

{

        u8 r = simple_strtoul(buf, NULL, 10);

        mutex_lock(&data->update_lock);

        r &= data->alarm_mask;

        data->beep_mask = r;

        gl520_write_value(client, reg, r);

        mutex_unlock(&data->update_lock);

        return count;

}

static struct attribute *gl520_attributes[] = {

        &dev_attr_cpu0_vid.attr,

        &dev_attr_in0_input.attr,

        &dev_attr_in0_min.attr,

        &dev_attr_in0_max.attr,

        &dev_attr_in1_input.attr,

        &dev_attr_in1_min.attr,

        &dev_attr_in1_max.attr,

        &dev_attr_in2_input.attr,

        &dev_attr_in2_min.attr,

        &dev_attr_in2_max.attr,

        &dev_attr_in3_input.attr,

        &dev_attr_in3_min.attr,

        &dev_attr_in3_max.attr,

        &dev_attr_fan1_input.attr,

        &dev_attr_fan1_min.attr,

        &dev_attr_fan1_div.attr,

        &dev_attr_fan1_off.attr,

        &dev_attr_fan2_input.attr,

        &dev_attr_fan2_min.attr,

        &dev_attr_fan2_div.attr,

        &dev_attr_temp1_input.attr,

        &dev_attr_temp1_max.attr,

        &dev_attr_temp1_max_hyst.attr,

        &dev_attr_alarms.attr,

        &dev_attr_beep_enable.attr,

        &dev_attr_beep_mask.attr,

        NULL

};

static const struct attribute_group gl520_group = {

        .attrs = gl520_attributes,

};

static struct attribute *gl520_attributes_opt[] = {

        &dev_attr_in4_input.attr,

        &dev_attr_in4_min.attr,

        &dev_attr_in4_max.attr,

        &dev_attr_temp2_input.attr,

        &dev_attr_temp2_max.attr,

        &dev_attr_temp2_max_hyst.attr,

        NULL

};

static const struct attribute_group gl520_group_opt = {

        .attrs = gl520_attributes_opt,

};

/*

 * Real code

 */

static int gl520_attach_adapter(struct i2c_adapter *adapter)

{

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

                return 0;

        return i2c_probe(adapter, &addr_data, gl520_detect);

}

static int gl520_detect(struct i2c_adapter *adapter, int address, int kind)

{

        struct i2c_client *new_client;

        struct gl520_data *data;

        int err = 0;

        if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA |

                                     I2C_FUNC_SMBUS_WORD_DATA))

                goto exit;

        /* OK. For now, we presume we have a valid client. We now create the

           client structure, even though we cannot fill it completely yet.

           But it allows us to access gl520_{read,write}_value. */

        if (!(data = kzalloc(sizeof(struct gl520_data), GFP_KERNEL))) {

                err = -ENOMEM;

                goto exit;

        }

        new_client = &data->client;

        i2c_set_clientdata(new_client, data);

        new_client->addr = address;

        new_client->adapter = adapter;

        new_client->driver = &gl520_driver;

        new_client->flags = 0;

        /* Determine the chip type. */

        if (kind < 0) {

                if ((gl520_read_value(new_client, GL520_REG_CHIP_ID) != 0x20) ||

                    ((gl520_read_value(new_client, GL520_REG_REVISION) & 0x7f) != 0x00) ||

                    ((gl520_read_value(new_client, GL520_REG_CONF) & 0x80) != 0x00)) {

                        dev_dbg(&new_client->dev, "Unknown chip type, skipping\n");

                        goto exit_free;

                }

        }

        /* Fill in the remaining client fields */

        strlcpy(new_client->name, "gl520sm", I2C_NAME_SIZE);

        data->valid = 0;

        mutex_init(&data->update_lock);

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

        if ((err = i2c_attach_client(new_client)))

                goto exit_free;

        /* Initialize the GL520SM chip */

        gl520_init_client(new_client);

        /* Register sysfs hooks */

        if ((err = sysfs_create_group(&new_client->dev.kobj, &gl520_group)))

                goto exit_detach;

        if (data->two_temps) {

                if ((err = device_create_file(&new_client->dev,

                                              &dev_attr_temp2_input))

                 || (err = device_create_file(&new_client->dev,

                                              &dev_attr_temp2_max))

                 || (err = device_create_file(&new_client->dev,

                                              &dev_attr_temp2_max_hyst)))

                        goto exit_remove_files;

        } else {

                if ((err = device_create_file(&new_client->dev,

                                              &dev_attr_in4_input))

                 || (err = device_create_file(&new_client->dev,

                                              &dev_attr_in4_min))

                 || (err = device_create_file(&new_client->dev,

                                              &dev_attr_in4_max)))

                        goto exit_remove_files;

        }

        data->hwmon_dev = hwmon_device_register(&new_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(&new_client->dev.kobj, &gl520_group);

        sysfs_remove_group(&new_client->dev.kobj, &gl520_group_opt);

exit_detach:

        i2c_detach_client(new_client);

exit_free:

        kfree(data);

exit:

        return err;

}