smsc47m192.c

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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 <[e-mail]>

    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)