fscpos.c

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/*
	fscpos.c - Kernel module for hardware monitoring with FSC Poseidon chips
	Copyright (C) 2004, 2005 Stefan Ott <[e-mail]>

	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.
*/

/*
	fujitsu siemens poseidon chip,
	module based on the old fscpos module by Hermann Jung <[e-mail]> and
	the fscher module by Reinhard Nissl <[e-mail]>

	original module based on lm80.c
	Copyright (C) 1998, 1999 Frodo Looijaard <[e-mail]>
	and Philip Edelbrock <[e-mail]>

	Thanks to Jean Delvare for reviewing my code and suggesting a lot of
	improvements.
*/

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

/*
 * Addresses to scan
 */
static unsigned short normal_i2c[] = { 0x73, I2C_CLIENT_END };

/*
 * Insmod parameters
 */
I2C_CLIENT_INSMOD_1(fscpos);

/*
 * The FSCPOS registers
 */

/* chip identification */
#define FSCPOS_REG_IDENT_0		0x00
#define FSCPOS_REG_IDENT_1		0x01
#define FSCPOS_REG_IDENT_2		0x02
#define FSCPOS_REG_REVISION		0x03

/* global control and status */
#define FSCPOS_REG_EVENT_STATE		0x04
#define FSCPOS_REG_CONTROL		0x05

/* watchdog */
#define FSCPOS_REG_WDOG_PRESET		0x28
#define FSCPOS_REG_WDOG_STATE		0x23
#define FSCPOS_REG_WDOG_CONTROL		0x21

/* voltages */
#define FSCPOS_REG_VOLT_12		0x45
#define FSCPOS_REG_VOLT_5		0x42
#define FSCPOS_REG_VOLT_BATT		0x48

/* fans - the chip does not support minimum speed for fan2 */
static u8 FSCPOS_REG_PWM[] = { 0x55, 0x65 };
static u8 FSCPOS_REG_FAN_ACT[] = { 0x0e, 0x6b, 0xab };
static u8 FSCPOS_REG_FAN_STATE[] = { 0x0d, 0x62, 0xa2 };
static u8 FSCPOS_REG_FAN_RIPPLE[] = { 0x0f, 0x6f, 0xaf };

/* temperatures */
static u8 FSCPOS_REG_TEMP_ACT[] = { 0x64, 0x32, 0x35 };
static u8 FSCPOS_REG_TEMP_STATE[] = { 0x71, 0x81, 0x91 };

/*
 * Functions declaration
 */
static int fscpos_attach_adapter(struct i2c_adapter *adapter);
static int fscpos_detect(struct i2c_adapter *adapter, int address, int kind);
static int fscpos_detach_client(struct i2c_client *client);

static int fscpos_read_value(struct i2c_client *client, u8 reg);
static int fscpos_write_value(struct i2c_client *client, u8 reg, u8 value);
static struct fscpos_data *fscpos_update_device(struct device *dev);
static void fscpos_init_client(struct i2c_client *client);

static void reset_fan_alarm(struct i2c_client *client, int nr);

/*
 * Driver data (common to all clients)
 */
static struct i2c_driver fscpos_driver = {
	.driver = {
		.name	= "fscpos",
	},
	.id		= I2C_DRIVERID_FSCPOS,
	.attach_adapter	= fscpos_attach_adapter,
	.detach_client	= fscpos_detach_client,
};

/*
 * Client data (each client gets its own)
 */
struct fscpos_data {
	struct i2c_client client;
	struct device *hwmon_dev;
	struct mutex update_lock;
	char valid; 		/* 0 until following fields are valid */
	unsigned long last_updated;	/* In jiffies */

	/* register values */
	u8 revision;		/* revision of chip */
	u8 global_event;	/* global event status */
	u8 global_control;	/* global control register */
	u8 wdog_control;	/* watchdog control */
	u8 wdog_state;		/* watchdog status */
	u8 wdog_preset;		/* watchdog preset */
	u8 volt[3];		/* 12, 5, battery current */
	u8 temp_act[3];		/* temperature */
	u8 temp_status[3];	/* status of sensor */
	u8 fan_act[3];		/* fans revolutions per second */
	u8 fan_status[3];	/* fan status */
	u8 pwm[2];		/* fan min value for rps */
	u8 fan_ripple[3];	/* divider for rps */
};

/* Temperature */
#define TEMP_FROM_REG(val)	(((val) - 128) * 1000)

static ssize_t show_temp_input(struct fscpos_data *data, char *buf, int nr)
{
	return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp_act[nr - 1]));
}

static ssize_t show_temp_status(struct fscpos_data *data, char *buf, int nr)
{
	/* bits 2..7 reserved => mask with 0x03 */
	return sprintf(buf, "%u\n", data->temp_status[nr - 1] & 0x03);
}

static ssize_t show_temp_reset(struct fscpos_data *data, char *buf, int nr)
{
	return sprintf(buf, "1\n");
}

static ssize_t set_temp_reset(struct i2c_client *client, struct fscpos_data
			*data, const char *buf,	size_t count, int nr, int reg)
{
	unsigned long v = simple_strtoul(buf, NULL, 10);
	if (v != 1) {
		dev_err(&client->dev, "temp_reset value %ld not supported. "
					"Use 1 to reset the alarm!\n", v);
		return -EINVAL;
	}

	dev_info(&client->dev, "You used the temp_reset feature which has not "
				"been proplerly tested. Please report your "
				"experience to the module author.\n");

	/* Supported value: 2 (clears the status) */
	fscpos_write_value(client, FSCPOS_REG_TEMP_STATE[nr - 1], 2);
	return count;
}

/* Fans */
#define RPM_FROM_REG(val)	((val) * 60)

static ssize_t show_fan_status(struct fscpos_data *data, char *buf, int nr)
{
	/* bits 0..1, 3..7 reserved => mask with 0x04 */
	return sprintf(buf, "%u\n", data->fan_status[nr - 1] & 0x04);
}

static ssize_t show_fan_input(struct fscpos_data *data, char *buf, int nr)
{
	return sprintf(buf, "%u\n", RPM_FROM_REG(data->fan_act[nr - 1]));
}

static ssize_t show_fan_ripple(struct fscpos_data *data, char *buf, int nr)
{
	/* bits 2..7 reserved => mask with 0x03 */
	return sprintf(buf, "%u\n", data->fan_ripple[nr - 1] & 0x03);
}

static ssize_t set_fan_ripple(struct i2c_client *client, struct fscpos_data
			*data, const char *buf,	size_t count, int nr, int reg)
{
	/* supported values: 2, 4, 8 */
	unsigned long v = simple_strtoul(buf, NULL, 10);

	switch (v) {
		case 2: v = 1; break;
		case 4: v = 2; break;
		case 8: v = 3; break;
	default:
		dev_err(&client->dev, "fan_ripple value %ld not supported. "
					"Must be one of 2, 4 or 8!\n", v);
		return -EINVAL;
	}
	
	mutex_lock(&data->update_lock);
	/* bits 2..7 reserved => mask with 0x03 */
	data->fan_ripple[nr - 1] &= ~0x03;
	data->fan_ripple[nr - 1] |= v;
	
	fscpos_write_value(client, reg, data->fan_ripple[nr - 1]);
	mutex_unlock(&data->update_lock);
	return count;
}

static ssize_t show_pwm(struct fscpos_data *data, char *buf, int nr)
{
	return sprintf(buf, "%u\n", data->pwm[nr - 1]);
}

static ssize_t set_pwm(struct i2c_client *client, struct fscpos_data *data,
				const char *buf, size_t count, int nr, int reg)
{
	unsigned long v = simple_strtoul(buf, NULL, 10);

	/* Range: 0..255 */
	if (v < 0) v = 0;
	if (v > 255) v = 255;

	mutex_lock(&data->update_lock);
	data->pwm[nr - 1] = v;
	fscpos_write_value(client, reg, data->pwm[nr - 1]);
	mutex_unlock(&data->update_lock);
	return count;
}

static void reset_fan_alarm(struct i2c_client *client, int nr)
{
	fscpos_write_value(client, FSCPOS_REG_FAN_STATE[nr], 4);
}

/* Volts */
#define VOLT_FROM_REG(val, mult)	((val) * (mult) / 255)

static ssize_t show_volt_12(struct device *dev, struct device_attribute *attr, char *buf)
{
	struct fscpos_data *data = fscpos_update_device(dev);
	return sprintf(buf, "%u\n", VOLT_FROM_REG(data->volt[0], 14200));
}

static ssize_t show_volt_5(struct device *dev, struct device_attribute *attr, char *buf)
{
	struct fscpos_data *data = fscpos_update_device(dev);
	return sprintf(buf, "%u\n", VOLT_FROM_REG(data->volt[1], 6600));
}

static ssize_t show_volt_batt(struct device *dev, struct device_attribute *attr, char *buf)
{
	struct fscpos_data *data = fscpos_update_device(dev);
	return sprintf(buf, "%u\n", VOLT_FROM_REG(data->volt[2], 3300));
}

/* Watchdog */
static ssize_t show_wdog_control(struct fscpos_data *data, char *buf)
{
	/* bits 0..3 reserved, bit 6 write only => mask with 0xb0 */
	return sprintf(buf, "%u\n", data->wdog_control & 0xb0);
}

static ssize_t set_wdog_control(struct i2c_client *client, struct fscpos_data
				*data, const char *buf,	size_t count, int reg)
{
	/* bits 0..3 reserved => mask with 0xf0 */
	unsigned long v = simple_strtoul(buf, NULL, 10) & 0xf0;

	mutex_lock(&data->update_lock);
	data->wdog_control &= ~0xf0;
	data->wdog_control |= v;
	fscpos_write_value(client, reg, data->wdog_control);
	mutex_unlock(&data->update_lock);
	return count;
}

static ssize_t show_wdog_state(struct fscpos_data *data, char *buf)
{
	/* bits 0, 2..7 reserved => mask with 0x02 */
	return sprintf(buf, "%u\n", data->wdog_state & 0x02);
}

static ssize_t set_wdog_state(struct i2c_client *client, struct fscpos_data
				*data, const char *buf, size_t count, int reg)
{
	unsigned long v = simple_strtoul(buf, NULL, 10) & 0x02;

	/* Valid values: 2 (clear) */
	if (v != 2) {
		dev_err(&client->dev, "wdog_state value %ld not supported. "
					"Must be 2 to clear the state!\n", v);
		return -EINVAL;
	}

	mutex_lock(&data->update_lock);
	data->wdog_state &= ~v;
	fscpos_write_value(client, reg, v);
	mutex_unlock(&data->update_lock);
	return count;
}

static ssize_t show_wdog_preset(struct fscpos_data *data, char *buf)
{
	return sprintf(buf, "%u\n", data->wdog_preset);
}

static ssize_t set_wdog_preset(struct i2c_client *client, struct fscpos_data
				*data, const char *buf,	size_t count, int reg)
{
	unsigned long v = simple_strtoul(buf, NULL, 10) & 0xff;

	mutex_lock(&data->update_lock);
	data->wdog_preset = v;
	fscpos_write_value(client, reg, data->wdog_preset);
	mutex_unlock(&data->update_lock);
	return count;
}

/* Event */
static ssize_t show_event(struct device *dev, struct device_attribute *attr, char *buf)