drivers/hwmon/fscher.c - kernel/msm-4.9 - Gitiles

 /*
  * fscher.c - Part of lm_sensors, Linux kernel modules for hardware
  * monitoring
  * Copyright (C) 2003, 2004 Reinhard Nissl <rnissl@gmx.de>
  *
  * 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 hermes chip,
  *  module based on fscpos.c
  *  Copyright (C) 2000 Hermann Jung <hej@odn.de>
  *  Copyright (C) 1998, 1999 Frodo Looijaard <frodol@dds.nl>
  *  and Philip Edelbrock <phil@netroedge.com>
  */

 #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/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(fscher);

 /*
  * The FSCHER registers
  */

 /* chip identification */
 #define FSCHER_REG_IDENT_0		0x00
 #define FSCHER_REG_IDENT_1		0x01
 #define FSCHER_REG_IDENT_2		0x02
 #define FSCHER_REG_REVISION		0x03

 /* global control and status */
 #define FSCHER_REG_EVENT_STATE		0x04
 #define FSCHER_REG_CONTROL		0x05

 /* watchdog */
 #define FSCHER_REG_WDOG_PRESET		0x28
 #define FSCHER_REG_WDOG_STATE		0x23
 #define FSCHER_REG_WDOG_CONTROL		0x21

 /* fan 0 */
 #define FSCHER_REG_FAN0_MIN		0x55
 #define FSCHER_REG_FAN0_ACT		0x0e
 #define FSCHER_REG_FAN0_STATE		0x0d
 #define FSCHER_REG_FAN0_RIPPLE		0x0f

 /* fan 1 */
 #define FSCHER_REG_FAN1_MIN		0x65
 #define FSCHER_REG_FAN1_ACT		0x6b
 #define FSCHER_REG_FAN1_STATE		0x62
 #define FSCHER_REG_FAN1_RIPPLE		0x6f

 /* fan 2 */
 #define FSCHER_REG_FAN2_MIN		0xb5
 #define FSCHER_REG_FAN2_ACT		0xbb
 #define FSCHER_REG_FAN2_STATE		0xb2
 #define FSCHER_REG_FAN2_RIPPLE		0xbf

 /* voltage supervision */
 #define FSCHER_REG_VOLT_12		0x45
 #define FSCHER_REG_VOLT_5		0x42
 #define FSCHER_REG_VOLT_BATT		0x48

 /* temperature 0 */
 #define FSCHER_REG_TEMP0_ACT		0x64
 #define FSCHER_REG_TEMP0_STATE		0x71

 /* temperature 1 */
 #define FSCHER_REG_TEMP1_ACT		0x32
 #define FSCHER_REG_TEMP1_STATE		0x81

 /* temperature 2 */
 #define FSCHER_REG_TEMP2_ACT		0x35
 #define FSCHER_REG_TEMP2_STATE		0x91

 /*
  * Functions declaration
  */

 static int fscher_attach_adapter(struct i2c_adapter *adapter);
 static int fscher_detect(struct i2c_adapter *adapter, int address, int kind);
 static int fscher_detach_client(struct i2c_client *client);
 static struct fscher_data *fscher_update_device(struct device *dev);
 static void fscher_init_client(struct i2c_client *client);

 static int fscher_read_value(struct i2c_client *client, u8 reg);
 static int fscher_write_value(struct i2c_client *client, u8 reg, u8 value);

 /*
  * Driver data (common to all clients)
  */

 static struct i2c_driver fscher_driver = {
 	.driver = {
 		.name	= "fscher",
 	},
 	.id		= I2C_DRIVERID_FSCHER,
 	.attach_adapter	= fscher_attach_adapter,
 	.detach_client	= fscher_detach_client,
 };

 /*
  * Client data (each client gets its own)
  */

 struct fscher_data {
 	struct i2c_client client;
 	struct class_device *class_dev;
 	struct mutex update_lock;
 	char valid; /* zero 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 watchdog[3];		/* watchdog */
 	u8 volt[3];		/* 12, 5, battery voltage */
 	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 fan_min[3];		/* fan min value for rps */
 	u8 fan_ripple[3];	/* divider for rps */
 };

 /*
  * Sysfs stuff
  */

 #define sysfs_r(kind, sub, offset, reg) \
 static ssize_t show_##kind##sub (struct fscher_data *, char *, int); \
 static ssize_t show_##kind##offset##sub (struct device *, struct device_attribute *attr, char *); \
 static ssize_t show_##kind##offset##sub (struct device *dev, struct device_attribute *attr, char *buf) \
 { \
 	struct fscher_data *data = fscher_update_device(dev); \
 	return show_##kind##sub(data, buf, (offset)); \
 }

 #define sysfs_w(kind, sub, offset, reg) \
 static ssize_t set_##kind##sub (struct i2c_client *, struct fscher_data *, const char *, size_t, int, int); \
 static ssize_t set_##kind##offset##sub (struct device *, struct device_attribute *attr, const char *, size_t); \
 static ssize_t set_##kind##offset##sub (struct device *dev, struct device_attribute *attr, const char *buf, size_t count) \
 { \
 	struct i2c_client *client = to_i2c_client(dev); \
 	struct fscher_data *data = i2c_get_clientdata(client); \
 	return set_##kind##sub(client, data, buf, count, (offset), reg); \
 }

 #define sysfs_rw_n(kind, sub, offset, reg) \
 sysfs_r(kind, sub, offset, reg) \
 sysfs_w(kind, sub, offset, reg) \
 static DEVICE_ATTR(kind##offset##sub, S_IRUGO | S_IWUSR, show_##kind##offset##sub, set_##kind##offset##sub);

 #define sysfs_rw(kind, sub, reg) \
 sysfs_r(kind, sub, 0, reg) \
 sysfs_w(kind, sub, 0, reg) \
 static DEVICE_ATTR(kind##sub, S_IRUGO | S_IWUSR, show_##kind##0##sub, set_##kind##0##sub);

 #define sysfs_ro_n(kind, sub, offset, reg) \
 sysfs_r(kind, sub, offset, reg) \
 static DEVICE_ATTR(kind##offset##sub, S_IRUGO, show_##kind##offset##sub, NULL);

 #define sysfs_ro(kind, sub, reg) \
 sysfs_r(kind, sub, 0, reg) \
 static DEVICE_ATTR(kind, S_IRUGO, show_##kind##0##sub, NULL);

 #define sysfs_fan(offset, reg_status, reg_min, reg_ripple, reg_act) \
 sysfs_rw_n(pwm,        , offset, reg_min) \
 sysfs_rw_n(fan, _status, offset, reg_status) \
 sysfs_rw_n(fan, _div   , offset, reg_ripple) \
 sysfs_ro_n(fan, _input , offset, reg_act)

 #define sysfs_temp(offset, reg_status, reg_act) \
 sysfs_rw_n(temp, _status, offset, reg_status) \
 sysfs_ro_n(temp, _input , offset, reg_act)

 #define sysfs_in(offset, reg_act) \
 sysfs_ro_n(in, _input, offset, reg_act)

 #define sysfs_revision(reg_revision) \
 sysfs_ro(revision, , reg_revision)

 #define sysfs_alarms(reg_events) \
 sysfs_ro(alarms, , reg_events)

 #define sysfs_control(reg_control) \
 sysfs_rw(control, , reg_control)

 #define sysfs_watchdog(reg_control, reg_status, reg_preset) \
 sysfs_rw(watchdog, _control, reg_control) \
 sysfs_rw(watchdog, _status , reg_status) \
 sysfs_rw(watchdog, _preset , reg_preset)

 sysfs_fan(1, FSCHER_REG_FAN0_STATE, FSCHER_REG_FAN0_MIN,
 	     FSCHER_REG_FAN0_RIPPLE, FSCHER_REG_FAN0_ACT)
 sysfs_fan(2, FSCHER_REG_FAN1_STATE, FSCHER_REG_FAN1_MIN,
 	     FSCHER_REG_FAN1_RIPPLE, FSCHER_REG_FAN1_ACT)
 sysfs_fan(3, FSCHER_REG_FAN2_STATE, FSCHER_REG_FAN2_MIN,
 	     FSCHER_REG_FAN2_RIPPLE, FSCHER_REG_FAN2_ACT)

 sysfs_temp(1, FSCHER_REG_TEMP0_STATE, FSCHER_REG_TEMP0_ACT)
 sysfs_temp(2, FSCHER_REG_TEMP1_STATE, FSCHER_REG_TEMP1_ACT)
 sysfs_temp(3, FSCHER_REG_TEMP2_STATE, FSCHER_REG_TEMP2_ACT)

 sysfs_in(0, FSCHER_REG_VOLT_12)
 sysfs_in(1, FSCHER_REG_VOLT_5)
 sysfs_in(2, FSCHER_REG_VOLT_BATT)

 sysfs_revision(FSCHER_REG_REVISION)
 sysfs_alarms(FSCHER_REG_EVENTS)
 sysfs_control(FSCHER_REG_CONTROL)
 sysfs_watchdog(FSCHER_REG_WDOG_CONTROL, FSCHER_REG_WDOG_STATE, FSCHER_REG_WDOG_PRESET)

 static struct attribute *fscher_attributes[] = {
 	&dev_attr_revision.attr,
 	&dev_attr_alarms.attr,
 	&dev_attr_control.attr,

 	&dev_attr_watchdog_status.attr,
 	&dev_attr_watchdog_control.attr,
 	&dev_attr_watchdog_preset.attr,

 	&dev_attr_in0_input.attr,
 	&dev_attr_in1_input.attr,
 	&dev_attr_in2_input.attr,

 	&dev_attr_fan1_status.attr,
 	&dev_attr_fan1_div.attr,
 	&dev_attr_fan1_input.attr,
 	&dev_attr_pwm1.attr,
 	&dev_attr_fan2_status.attr,
 	&dev_attr_fan2_div.attr,
 	&dev_attr_fan2_input.attr,
 	&dev_attr_pwm2.attr,
 	&dev_attr_fan3_status.attr,
 	&dev_attr_fan3_div.attr,
 	&dev_attr_fan3_input.attr,
 	&dev_attr_pwm3.attr,

 	&dev_attr_temp1_status.attr,
 	&dev_attr_temp1_input.attr,
 	&dev_attr_temp2_status.attr,
 	&dev_attr_temp2_input.attr,
 	&dev_attr_temp3_status.attr,
 	&dev_attr_temp3_input.attr,
 	NULL
 };

 static const struct attribute_group fscher_group = {
 	.attrs = fscher_attributes,
 };

 /*
  * Real code
  */

 static int fscher_attach_adapter(struct i2c_adapter *adapter)
 {
 	if (!(adapter->class & I2C_CLASS_HWMON))
 		return 0;
 	return i2c_probe(adapter, &addr_data, fscher_detect);
 }

 static int fscher_detect(struct i2c_adapter *adapter, int address, int kind)
 {
 	struct i2c_client *new_client;
 	struct fscher_data *data;
 	int err = 0;

 	if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_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 i2c_smbus_read_byte_data. */
 	if (!(data = kzalloc(sizeof(struct fscher_data), GFP_KERNEL))) {
 		err = -ENOMEM;
 		goto exit;
   	}

 	/* The common I2C client data is placed right before the
 	 * Hermes-specific data. */
 	new_client = &data->client;
 	i2c_set_clientdata(new_client, data);
 	new_client->addr = address;
 	new_client->adapter = adapter;
 	new_client->driver = &fscher_driver;
 	new_client->flags = 0;

 	/* Do the remaining detection unless force or force_fscher parameter */
 	if (kind < 0) {
 		if ((i2c_smbus_read_byte_data(new_client,
 		     FSCHER_REG_IDENT_0) != 0x48)	/* 'H' */
 		 || (i2c_smbus_read_byte_data(new_client,
 		     FSCHER_REG_IDENT_1) != 0x45)	/* 'E' */
 		 || (i2c_smbus_read_byte_data(new_client,
 		     FSCHER_REG_IDENT_2) != 0x52))	/* 'R' */
 			goto exit_free;
 	}

 	/* Fill in the remaining client fields and put it into the
 	 * global list */
 	strlcpy(new_client->name, "fscher", 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;

 	fscher_init_client(new_client);

 	/* Register sysfs hooks */
 	if ((err = sysfs_create_group(&new_client->dev.kobj, &fscher_group)))
 		goto exit_detach;

 	data->class_dev = hwmon_device_register(&new_client->dev);
 	if (IS_ERR(data->class_dev)) {
 		err = PTR_ERR(data->class_dev);
 		goto exit_remove_files;
 	}

 	return 0;

 exit_remove_files:
 	sysfs_remove_group(&new_client->dev.kobj, &fscher_group);
 exit_detach:
 	i2c_detach_client(new_client);
 exit_free:
 	kfree(data);
 exit:
 	return err;
 }

 static int fscher_detach_client(struct i2c_client *client)
 {
 	struct fscher_data *data = i2c_get_clientdata(client);
 	int err;

 	hwmon_device_unregister(data->class_dev);
 	sysfs_remove_group(&client->dev.kobj, &fscher_group);

 	if ((err = i2c_detach_client(client)))
 		return err;

 	kfree(data);
 	return 0;
 }

 static int fscher_read_value(struct i2c_client *client, u8 reg)
 {
 	dev_dbg(&client->dev, "read reg 0x%02x\n", reg);

 	return i2c_smbus_read_byte_data(client, reg);
 }

 static int fscher_write_value(struct i2c_client *client, u8 reg, u8 value)
 {
 	dev_dbg(&client->dev, "write reg 0x%02x, val 0x%02x\n",
 		reg, value);

 	return i2c_smbus_write_byte_data(client, reg, value);
 }

 /* Called when we have found a new FSC Hermes. */
 static void fscher_init_client(struct i2c_client *client)
 {
 	struct fscher_data *data = i2c_get_clientdata(client);

 	/* Read revision from chip */
 	data->revision =  fscher_read_value(client, FSCHER_REG_REVISION);
 }

 static struct fscher_data *fscher_update_device(struct device *dev)
 {
 	struct i2c_client *client = to_i2c_client(dev);
 	struct fscher_data *data = i2c_get_clientdata(client);

 	mutex_lock(&data->update_lock);

 	if (time_after(jiffies, data->last_updated + 2 * HZ) || !data->valid) {

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

 		data->temp_act[0] = fscher_read_value(client, FSCHER_REG_TEMP0_ACT);
 		data->temp_act[1] = fscher_read_value(client, FSCHER_REG_TEMP1_ACT);
 		data->temp_act[2] = fscher_read_value(client, FSCHER_REG_TEMP2_ACT);
 		data->temp_status[0] = fscher_read_value(client, FSCHER_REG_TEMP0_STATE);
 		data->temp_status[1] = fscher_read_value(client, FSCHER_REG_TEMP1_STATE);
 		data->temp_status[2] = fscher_read_value(client, FSCHER_REG_TEMP2_STATE);

 		data->volt[0] = fscher_read_value(client, FSCHER_REG_VOLT_12);
 		data->volt[1] = fscher_read_value(client, FSCHER_REG_VOLT_5);
 		data->volt[2] = fscher_read_value(client, FSCHER_REG_VOLT_BATT);

 		data->fan_act[0] = fscher_read_value(client, FSCHER_REG_FAN0_ACT);
 		data->fan_act[1] = fscher_read_value(client, FSCHER_REG_FAN1_ACT);
 		data->fan_act[2] = fscher_read_value(client, FSCHER_REG_FAN2_ACT);
 		data->fan_status[0] = fscher_read_value(client, FSCHER_REG_FAN0_STATE);
 		data->fan_status[1] = fscher_read_value(client, FSCHER_REG_FAN1_STATE);
 		data->fan_status[2] = fscher_read_value(client, FSCHER_REG_FAN2_STATE);
 		data->fan_min[0] = fscher_read_value(client, FSCHER_REG_FAN0_MIN);
 		data->fan_min[1] = fscher_read_value(client, FSCHER_REG_FAN1_MIN);
 		data->fan_min[2] = fscher_read_value(client, FSCHER_REG_FAN2_MIN);
 		data->fan_ripple[0] = fscher_read_value(client, FSCHER_REG_FAN0_RIPPLE);
 		data->fan_ripple[1] = fscher_read_value(client, FSCHER_REG_FAN1_RIPPLE);
 		data->fan_ripple[2] = fscher_read_value(client, FSCHER_REG_FAN2_RIPPLE);

 		data->watchdog[0] = fscher_read_value(client, FSCHER_REG_WDOG_PRESET);
 		data->watchdog[1] = fscher_read_value(client, FSCHER_REG_WDOG_STATE);
 		data->watchdog[2] = fscher_read_value(client, FSCHER_REG_WDOG_CONTROL);

 		data->global_event = fscher_read_value(client, FSCHER_REG_EVENT_STATE);
 		data->global_control = fscher_read_value(client,
 							FSCHER_REG_CONTROL);

 		data->last_updated = jiffies;
 		data->valid = 1;
 	}

 	mutex_unlock(&data->update_lock);

 	return data;
 }


 #define FAN_INDEX_FROM_NUM(nr)	((nr) - 1)

 static ssize_t set_fan_status(struct i2c_client *client, struct fscher_data *data,
 			      const char *buf, size_t count, int nr, int reg)
 {
 	/* bits 0..1, 3..7 reserved => mask with 0x04 */
 	unsigned long v = simple_strtoul(buf, NULL, 10) & 0x04;

 	mutex_lock(&data->update_lock);
 	data->fan_status[FAN_INDEX_FROM_NUM(nr)] &= ~v;
 	fscher_write_value(client, reg, v);
 	mutex_unlock(&data->update_lock);
 	return count;
 }

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

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

 	mutex_lock(&data->update_lock);
 	data->fan_min[FAN_INDEX_FROM_NUM(nr)] = v > 0xff ? 0xff : v;
 	fscher_write_value(client, reg, data->fan_min[FAN_INDEX_FROM_NUM(nr)]);
 	mutex_unlock(&data->update_lock);
 	return count;
 }

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

 static ssize_t set_fan_div(struct i2c_client *client, struct fscher_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_div value %ld not "
 			 "supported. Choose 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[FAN_INDEX_FROM_NUM(nr)] &= ~0x03;
 	data->fan_ripple[FAN_INDEX_FROM_NUM(nr)] |= v;

 	fscher_write_value(client, reg, data->fan_ripple[FAN_INDEX_FROM_NUM(nr)]);
 	mutex_unlock(&data->update_lock);
 	return count;
 }

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

 #define RPM_FROM_REG(val)	(val*60)

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


 #define TEMP_INDEX_FROM_NUM(nr)		((nr) - 1)

 static ssize_t set_temp_status(struct i2c_client *client, struct fscher_data *data,
 			       const char *buf, size_t count, int nr, int reg)
 {
 	/* bits 2..7 reserved, 0 read only => mask with 0x02 */
 	unsigned long v = simple_strtoul(buf, NULL, 10) & 0x02;

 	mutex_lock(&data->update_lock);
 	data->temp_status[TEMP_INDEX_FROM_NUM(nr)] &= ~v;
 	fscher_write_value(client, reg, v);
 	mutex_unlock(&data->update_lock);
 	return count;
 }

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

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

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

 /*
  * The final conversion is specified in sensors.conf, as it depends on
  * mainboard specific values. We export the registers contents as
  * pseudo-hundredths-of-Volts (range 0V - 2.55V). Not that it makes much
  * sense per se, but it minimizes the conversions count and keeps the
  * values within a usual range.
  */
 #define VOLT_FROM_REG(val)	((val) * 10)

 static ssize_t show_in_input(struct fscher_data *data, char *buf, int nr)
 {
 	return sprintf(buf, "%u\n", VOLT_FROM_REG(data->volt[nr]));
 }


 static ssize_t show_revision(struct fscher_data *data, char *buf, int nr)
 {
 	return sprintf(buf, "%u\n", data->revision);
 }


 static ssize_t show_alarms(struct fscher_data *data, char *buf, int nr)
 {
 	/* bits 2, 5..6 reserved => mask with 0x9b */
 	return sprintf(buf, "%u\n", data->global_event & 0x9b);
 }


 static ssize_t set_control(struct i2c_client *client, struct fscher_data *data,
 			   const char *buf, size_t count, int nr, int reg)
 {
 	/* bits 1..7 reserved => mask with 0x01 */
 	unsigned long v = simple_strtoul(buf, NULL, 10) & 0x01;

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

 static ssize_t show_control(struct fscher_data *data, char *buf, int nr)
 {
 	/* bits 1..7 reserved => mask with 0x01 */
 	return sprintf(buf, "%u\n", data->global_control & 0x01);
 }


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

 	mutex_lock(&data->update_lock);
 	data->watchdog[2] &= ~0xf0;
 	data->watchdog[2] |= v;
 	fscher_write_value(client, reg, data->watchdog[2]);
 	mutex_unlock(&data->update_lock);
 	return count;
 }

 static ssize_t show_watchdog_control(struct fscher_data *data, char *buf, int nr)
 {
 	/* bits 0..3 reserved, bit 5 write only => mask with 0xd0 */
 	return sprintf(buf, "%u\n", data->watchdog[2] & 0xd0);
 }

 static ssize_t set_watchdog_status(struct i2c_client *client, struct fscher_data *data,
 				   const char *buf, size_t count, int nr, int reg)
 {
 	/* bits 0, 2..7 reserved => mask with 0x02 */
 	unsigned long v = simple_strtoul(buf, NULL, 10) & 0x02;

 	mutex_lock(&data->update_lock);
 	data->watchdog[1] &= ~v;
 	fscher_write_value(client, reg, v);
 	mutex_unlock(&data->update_lock);
 	return count;
 }

 static ssize_t show_watchdog_status(struct fscher_data *data, char *buf, int nr)
 {
 	/* bits 0, 2..7 reserved => mask with 0x02 */
 	return sprintf(buf, "%u\n", data->watchdog[1] & 0x02);
 }

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

 	mutex_lock(&data->update_lock);
 	data->watchdog[0] = v;
 	fscher_write_value(client, reg, data->watchdog[0]);
 	mutex_unlock(&data->update_lock);
 	return count;
 }

 static ssize_t show_watchdog_preset(struct fscher_data *data, char *buf, int nr)
 {
 	return sprintf(buf, "%u\n", data->watchdog[0]);
 }

 static int __init sensors_fscher_init(void)
 {
 	return i2c_add_driver(&fscher_driver);
 }

 static void __exit sensors_fscher_exit(void)
 {
 	i2c_del_driver(&fscher_driver);
 }

 MODULE_AUTHOR("Reinhard Nissl <rnissl@gmx.de>");
 MODULE_DESCRIPTION("FSC Hermes driver");
 MODULE_LICENSE("GPL");

 module_init(sensors_fscher_init);
 module_exit(sensors_fscher_exit);
	/*
	* fscher.c - Part of lm_sensors, Linux kernel modules for hardware
	* monitoring
	* Copyright (C) 2003, 2004 Reinhard Nissl <rnissl@gmx.de>
	*
	* 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 hermes chip,
	* module based on fscpos.c
	* Copyright (C) 2000 Hermann Jung <hej@odn.de>
	* Copyright (C) 1998, 1999 Frodo Looijaard <frodol@dds.nl>
	* and Philip Edelbrock <phil@netroedge.com>
	*/

	#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/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(fscher);

	/*
	* The FSCHER registers
	*/

	/* chip identification */
	#define FSCHER_REG_IDENT_0 0x00
	#define FSCHER_REG_IDENT_1 0x01
	#define FSCHER_REG_IDENT_2 0x02
	#define FSCHER_REG_REVISION 0x03

	/* global control and status */
	#define FSCHER_REG_EVENT_STATE 0x04
	#define FSCHER_REG_CONTROL 0x05

	/* watchdog */
	#define FSCHER_REG_WDOG_PRESET 0x28
	#define FSCHER_REG_WDOG_STATE 0x23
	#define FSCHER_REG_WDOG_CONTROL 0x21

	/* fan 0 */
	#define FSCHER_REG_FAN0_MIN 0x55
	#define FSCHER_REG_FAN0_ACT 0x0e
	#define FSCHER_REG_FAN0_STATE 0x0d
	#define FSCHER_REG_FAN0_RIPPLE 0x0f

	/* fan 1 */
	#define FSCHER_REG_FAN1_MIN 0x65
	#define FSCHER_REG_FAN1_ACT 0x6b
	#define FSCHER_REG_FAN1_STATE 0x62
	#define FSCHER_REG_FAN1_RIPPLE 0x6f

	/* fan 2 */
	#define FSCHER_REG_FAN2_MIN 0xb5
	#define FSCHER_REG_FAN2_ACT 0xbb
	#define FSCHER_REG_FAN2_STATE 0xb2
	#define FSCHER_REG_FAN2_RIPPLE 0xbf

	/* voltage supervision */
	#define FSCHER_REG_VOLT_12 0x45
	#define FSCHER_REG_VOLT_5 0x42
	#define FSCHER_REG_VOLT_BATT 0x48

	/* temperature 0 */
	#define FSCHER_REG_TEMP0_ACT 0x64
	#define FSCHER_REG_TEMP0_STATE 0x71

	/* temperature 1 */
	#define FSCHER_REG_TEMP1_ACT 0x32
	#define FSCHER_REG_TEMP1_STATE 0x81

	/* temperature 2 */
	#define FSCHER_REG_TEMP2_ACT 0x35
	#define FSCHER_REG_TEMP2_STATE 0x91

	/*
	* Functions declaration
	*/

	static int fscher_attach_adapter(struct i2c_adapter *adapter);
	static int fscher_detect(struct i2c_adapter *adapter, int address, int kind);
	static int fscher_detach_client(struct i2c_client *client);
	static struct fscher_data fscher_update_device(struct device dev);
	static void fscher_init_client(struct i2c_client *client);

	static int fscher_read_value(struct i2c_client *client, u8 reg);
	static int fscher_write_value(struct i2c_client *client, u8 reg, u8 value);

	/*
	* Driver data (common to all clients)
	*/

	static struct i2c_driver fscher_driver = {
	.driver = {
	.name = "fscher",
	},
	.id = I2C_DRIVERID_FSCHER,
	.attach_adapter = fscher_attach_adapter,
	.detach_client = fscher_detach_client,
	};

	/*
	* Client data (each client gets its own)
	*/

	struct fscher_data {
	struct i2c_client client;
	struct class_device *class_dev;
	struct mutex update_lock;
	char valid; /* zero 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 watchdog[3]; /* watchdog */
	u8 volt[3]; /* 12, 5, battery voltage */
	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 fan_min[3]; /* fan min value for rps */
	u8 fan_ripple[3]; /* divider for rps */
	};

	/*
	* Sysfs stuff
	*/

	#define sysfs_r(kind, sub, offset, reg) \
	static ssize_t show_##kind##sub (struct fscher_data , char , int); \
	static ssize_t show_##kind##offset##sub (struct device , struct device_attribute attr, char *); \
	static ssize_t show_##kind##offset##sub (struct device dev, struct device_attribute attr, char *buf) \
	{ \
	struct fscher_data *data = fscher_update_device(dev); \
	return show_##kind##sub(data, buf, (offset)); \
	}

	#define sysfs_w(kind, sub, offset, reg) \
	static ssize_t set_##kind##sub (struct i2c_client , struct fscher_data , const char *, size_t, int, int); \
	static ssize_t set_##kind##offset##sub (struct device , struct device_attribute attr, const char *, size_t); \
	static ssize_t set_##kind##offset##sub (struct device dev, struct device_attribute attr, const char *buf, size_t count) \
	{ \
	struct i2c_client *client = to_i2c_client(dev); \
	struct fscher_data *data = i2c_get_clientdata(client); \
	return set_##kind##sub(client, data, buf, count, (offset), reg); \
	}

	#define sysfs_rw_n(kind, sub, offset, reg) \
	sysfs_r(kind, sub, offset, reg) \
	sysfs_w(kind, sub, offset, reg) \
	static DEVICE_ATTR(kind##offset##sub, S_IRUGO \| S_IWUSR, show_##kind##offset##sub, set_##kind##offset##sub);

	#define sysfs_rw(kind, sub, reg) \
	sysfs_r(kind, sub, 0, reg) \
	sysfs_w(kind, sub, 0, reg) \
	static DEVICE_ATTR(kind##sub, S_IRUGO \| S_IWUSR, show_##kind##0##sub, set_##kind##0##sub);

	#define sysfs_ro_n(kind, sub, offset, reg) \
	sysfs_r(kind, sub, offset, reg) \
	static DEVICE_ATTR(kind##offset##sub, S_IRUGO, show_##kind##offset##sub, NULL);

	#define sysfs_ro(kind, sub, reg) \
	sysfs_r(kind, sub, 0, reg) \
	static DEVICE_ATTR(kind, S_IRUGO, show_##kind##0##sub, NULL);

	#define sysfs_fan(offset, reg_status, reg_min, reg_ripple, reg_act) \
	sysfs_rw_n(pwm, , offset, reg_min) \
	sysfs_rw_n(fan, _status, offset, reg_status) \
	sysfs_rw_n(fan, _div , offset, reg_ripple) \
	sysfs_ro_n(fan, _input , offset, reg_act)

	#define sysfs_temp(offset, reg_status, reg_act) \
	sysfs_rw_n(temp, _status, offset, reg_status) \
	sysfs_ro_n(temp, _input , offset, reg_act)

	#define sysfs_in(offset, reg_act) \
	sysfs_ro_n(in, _input, offset, reg_act)

	#define sysfs_revision(reg_revision) \
	sysfs_ro(revision, , reg_revision)

	#define sysfs_alarms(reg_events) \
	sysfs_ro(alarms, , reg_events)

	#define sysfs_control(reg_control) \
	sysfs_rw(control, , reg_control)

	#define sysfs_watchdog(reg_control, reg_status, reg_preset) \
	sysfs_rw(watchdog, _control, reg_control) \
	sysfs_rw(watchdog, _status , reg_status) \
	sysfs_rw(watchdog, _preset , reg_preset)

	sysfs_fan(1, FSCHER_REG_FAN0_STATE, FSCHER_REG_FAN0_MIN,
	FSCHER_REG_FAN0_RIPPLE, FSCHER_REG_FAN0_ACT)
	sysfs_fan(2, FSCHER_REG_FAN1_STATE, FSCHER_REG_FAN1_MIN,
	FSCHER_REG_FAN1_RIPPLE, FSCHER_REG_FAN1_ACT)
	sysfs_fan(3, FSCHER_REG_FAN2_STATE, FSCHER_REG_FAN2_MIN,
	FSCHER_REG_FAN2_RIPPLE, FSCHER_REG_FAN2_ACT)

	sysfs_temp(1, FSCHER_REG_TEMP0_STATE, FSCHER_REG_TEMP0_ACT)
	sysfs_temp(2, FSCHER_REG_TEMP1_STATE, FSCHER_REG_TEMP1_ACT)
	sysfs_temp(3, FSCHER_REG_TEMP2_STATE, FSCHER_REG_TEMP2_ACT)

	sysfs_in(0, FSCHER_REG_VOLT_12)
	sysfs_in(1, FSCHER_REG_VOLT_5)
	sysfs_in(2, FSCHER_REG_VOLT_BATT)

	sysfs_revision(FSCHER_REG_REVISION)
	sysfs_alarms(FSCHER_REG_EVENTS)
	sysfs_control(FSCHER_REG_CONTROL)
	sysfs_watchdog(FSCHER_REG_WDOG_CONTROL, FSCHER_REG_WDOG_STATE, FSCHER_REG_WDOG_PRESET)

	static struct attribute *fscher_attributes[] = {
	&dev_attr_revision.attr,
	&dev_attr_alarms.attr,
	&dev_attr_control.attr,

	&dev_attr_watchdog_status.attr,
	&dev_attr_watchdog_control.attr,
	&dev_attr_watchdog_preset.attr,

	&dev_attr_in0_input.attr,
	&dev_attr_in1_input.attr,
	&dev_attr_in2_input.attr,

	&dev_attr_fan1_status.attr,
	&dev_attr_fan1_div.attr,
	&dev_attr_fan1_input.attr,
	&dev_attr_pwm1.attr,
	&dev_attr_fan2_status.attr,
	&dev_attr_fan2_div.attr,
	&dev_attr_fan2_input.attr,
	&dev_attr_pwm2.attr,
	&dev_attr_fan3_status.attr,
	&dev_attr_fan3_div.attr,
	&dev_attr_fan3_input.attr,
	&dev_attr_pwm3.attr,

	&dev_attr_temp1_status.attr,
	&dev_attr_temp1_input.attr,
	&dev_attr_temp2_status.attr,
	&dev_attr_temp2_input.attr,
	&dev_attr_temp3_status.attr,
	&dev_attr_temp3_input.attr,
	NULL
	};

	static const struct attribute_group fscher_group = {
	.attrs = fscher_attributes,
	};

	/*
	* Real code
	*/

	static int fscher_attach_adapter(struct i2c_adapter *adapter)
	{
	if (!(adapter->class & I2C_CLASS_HWMON))
	return 0;
	return i2c_probe(adapter, &addr_data, fscher_detect);
	}

	static int fscher_detect(struct i2c_adapter *adapter, int address, int kind)
	{
	struct i2c_client *new_client;
	struct fscher_data *data;
	int err = 0;

	if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_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 i2c_smbus_read_byte_data. */
	if (!(data = kzalloc(sizeof(struct fscher_data), GFP_KERNEL))) {
	err = -ENOMEM;
	goto exit;
	}

	/* The common I2C client data is placed right before the
	* Hermes-specific data. */
	new_client = &data->client;
	i2c_set_clientdata(new_client, data);
	new_client->addr = address;
	new_client->adapter = adapter;
	new_client->driver = &fscher_driver;
	new_client->flags = 0;

	/* Do the remaining detection unless force or force_fscher parameter */
	if (kind < 0) {
	if ((i2c_smbus_read_byte_data(new_client,
	FSCHER_REG_IDENT_0) != 0x48) /* 'H' */
	\|\| (i2c_smbus_read_byte_data(new_client,
	FSCHER_REG_IDENT_1) != 0x45) /* 'E' */
	\|\| (i2c_smbus_read_byte_data(new_client,
	FSCHER_REG_IDENT_2) != 0x52)) /* 'R' */
	goto exit_free;
	}

	/* Fill in the remaining client fields and put it into the
	* global list */
	strlcpy(new_client->name, "fscher", 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;

	fscher_init_client(new_client);

	/* Register sysfs hooks */
	if ((err = sysfs_create_group(&new_client->dev.kobj, &fscher_group)))
	goto exit_detach;

	data->class_dev = hwmon_device_register(&new_client->dev);
	if (IS_ERR(data->class_dev)) {
	err = PTR_ERR(data->class_dev);
	goto exit_remove_files;
	}

	return 0;

	exit_remove_files:
	sysfs_remove_group(&new_client->dev.kobj, &fscher_group);
	exit_detach:
	i2c_detach_client(new_client);
	exit_free:
	kfree(data);
	exit:
	return err;
	}

	static int fscher_detach_client(struct i2c_client *client)
	{
	struct fscher_data *data = i2c_get_clientdata(client);
	int err;

	hwmon_device_unregister(data->class_dev);
	sysfs_remove_group(&client->dev.kobj, &fscher_group);

	if ((err = i2c_detach_client(client)))
	return err;

	kfree(data);
	return 0;
	}

	static int fscher_read_value(struct i2c_client *client, u8 reg)
	{
	dev_dbg(&client->dev, "read reg 0x%02x\n", reg);

	return i2c_smbus_read_byte_data(client, reg);
	}

	static int fscher_write_value(struct i2c_client *client, u8 reg, u8 value)
	{
	dev_dbg(&client->dev, "write reg 0x%02x, val 0x%02x\n",
	reg, value);

	return i2c_smbus_write_byte_data(client, reg, value);
	}

	/* Called when we have found a new FSC Hermes. */
	static void fscher_init_client(struct i2c_client *client)
	{
	struct fscher_data *data = i2c_get_clientdata(client);

	/* Read revision from chip */
	data->revision = fscher_read_value(client, FSCHER_REG_REVISION);
	}

	static struct fscher_data fscher_update_device(struct device dev)
	{
	struct i2c_client *client = to_i2c_client(dev);
	struct fscher_data *data = i2c_get_clientdata(client);

	mutex_lock(&data->update_lock);

	if (time_after(jiffies, data->last_updated + 2 * HZ) \|\| !data->valid) {

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

	data->temp_act[0] = fscher_read_value(client, FSCHER_REG_TEMP0_ACT);
	data->temp_act[1] = fscher_read_value(client, FSCHER_REG_TEMP1_ACT);
	data->temp_act[2] = fscher_read_value(client, FSCHER_REG_TEMP2_ACT);
	data->temp_status[0] = fscher_read_value(client, FSCHER_REG_TEMP0_STATE);
	data->temp_status[1] = fscher_read_value(client, FSCHER_REG_TEMP1_STATE);
	data->temp_status[2] = fscher_read_value(client, FSCHER_REG_TEMP2_STATE);

	data->volt[0] = fscher_read_value(client, FSCHER_REG_VOLT_12);
	data->volt[1] = fscher_read_value(client, FSCHER_REG_VOLT_5);
	data->volt[2] = fscher_read_value(client, FSCHER_REG_VOLT_BATT);

	data->fan_act[0] = fscher_read_value(client, FSCHER_REG_FAN0_ACT);
	data->fan_act[1] = fscher_read_value(client, FSCHER_REG_FAN1_ACT);
	data->fan_act[2] = fscher_read_value(client, FSCHER_REG_FAN2_ACT);
	data->fan_status[0] = fscher_read_value(client, FSCHER_REG_FAN0_STATE);
	data->fan_status[1] = fscher_read_value(client, FSCHER_REG_FAN1_STATE);
	data->fan_status[2] = fscher_read_value(client, FSCHER_REG_FAN2_STATE);
	data->fan_min[0] = fscher_read_value(client, FSCHER_REG_FAN0_MIN);
	data->fan_min[1] = fscher_read_value(client, FSCHER_REG_FAN1_MIN);
	data->fan_min[2] = fscher_read_value(client, FSCHER_REG_FAN2_MIN);
	data->fan_ripple[0] = fscher_read_value(client, FSCHER_REG_FAN0_RIPPLE);
	data->fan_ripple[1] = fscher_read_value(client, FSCHER_REG_FAN1_RIPPLE);
	data->fan_ripple[2] = fscher_read_value(client, FSCHER_REG_FAN2_RIPPLE);

	data->watchdog[0] = fscher_read_value(client, FSCHER_REG_WDOG_PRESET);
	data->watchdog[1] = fscher_read_value(client, FSCHER_REG_WDOG_STATE);
	data->watchdog[2] = fscher_read_value(client, FSCHER_REG_WDOG_CONTROL);

	data->global_event = fscher_read_value(client, FSCHER_REG_EVENT_STATE);
	data->global_control = fscher_read_value(client,
	FSCHER_REG_CONTROL);

	data->last_updated = jiffies;
	data->valid = 1;
	}

	mutex_unlock(&data->update_lock);

	return data;
	}



	#define FAN_INDEX_FROM_NUM(nr) ((nr) - 1)

	static ssize_t set_fan_status(struct i2c_client client, struct fscher_data data,
	const char *buf, size_t count, int nr, int reg)
	{
	/* bits 0..1, 3..7 reserved => mask with 0x04 */
	unsigned long v = simple_strtoul(buf, NULL, 10) & 0x04;

	mutex_lock(&data->update_lock);
	data->fan_status[FAN_INDEX_FROM_NUM(nr)] &= ~v;
	fscher_write_value(client, reg, v);
	mutex_unlock(&data->update_lock);
	return count;
	}

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

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

	mutex_lock(&data->update_lock);
	data->fan_min[FAN_INDEX_FROM_NUM(nr)] = v > 0xff ? 0xff : v;
	fscher_write_value(client, reg, data->fan_min[FAN_INDEX_FROM_NUM(nr)]);
	mutex_unlock(&data->update_lock);
	return count;
	}

	static ssize_t show_pwm(struct fscher_data data, char buf, int nr)
	{
	return sprintf(buf, "%u\n", data->fan_min[FAN_INDEX_FROM_NUM(nr)]);
	}

	static ssize_t set_fan_div(struct i2c_client client, struct fscher_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_div value %ld not "
	"supported. Choose 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[FAN_INDEX_FROM_NUM(nr)] &= ~0x03;
	data->fan_ripple[FAN_INDEX_FROM_NUM(nr)] \|= v;

	fscher_write_value(client, reg, data->fan_ripple[FAN_INDEX_FROM_NUM(nr)]);
	mutex_unlock(&data->update_lock);
	return count;
	}

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

	#define RPM_FROM_REG(val) (val*60)

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



	#define TEMP_INDEX_FROM_NUM(nr) ((nr) - 1)

	static ssize_t set_temp_status(struct i2c_client client, struct fscher_data data,
	const char *buf, size_t count, int nr, int reg)
	{
	/* bits 2..7 reserved, 0 read only => mask with 0x02 */
	unsigned long v = simple_strtoul(buf, NULL, 10) & 0x02;

	mutex_lock(&data->update_lock);
	data->temp_status[TEMP_INDEX_FROM_NUM(nr)] &= ~v;
	fscher_write_value(client, reg, v);
	mutex_unlock(&data->update_lock);
	return count;
	}

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

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

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

	/*
	* The final conversion is specified in sensors.conf, as it depends on
	* mainboard specific values. We export the registers contents as
	* pseudo-hundredths-of-Volts (range 0V - 2.55V). Not that it makes much
	* sense per se, but it minimizes the conversions count and keeps the
	* values within a usual range.
	*/
	#define VOLT_FROM_REG(val) ((val) * 10)

	static ssize_t show_in_input(struct fscher_data data, char buf, int nr)
	{
	return sprintf(buf, "%u\n", VOLT_FROM_REG(data->volt[nr]));
	}



	static ssize_t show_revision(struct fscher_data data, char buf, int nr)
	{
	return sprintf(buf, "%u\n", data->revision);
	}



	static ssize_t show_alarms(struct fscher_data data, char buf, int nr)
	{
	/* bits 2, 5..6 reserved => mask with 0x9b */
	return sprintf(buf, "%u\n", data->global_event & 0x9b);
	}



	static ssize_t set_control(struct i2c_client client, struct fscher_data data,
	const char *buf, size_t count, int nr, int reg)
	{
	/* bits 1..7 reserved => mask with 0x01 */
	unsigned long v = simple_strtoul(buf, NULL, 10) & 0x01;

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

	static ssize_t show_control(struct fscher_data data, char buf, int nr)
	{
	/* bits 1..7 reserved => mask with 0x01 */
	return sprintf(buf, "%u\n", data->global_control & 0x01);
	}



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

	mutex_lock(&data->update_lock);
	data->watchdog[2] &= ~0xf0;
	data->watchdog[2] \|= v;
	fscher_write_value(client, reg, data->watchdog[2]);
	mutex_unlock(&data->update_lock);
	return count;
	}

	static ssize_t show_watchdog_control(struct fscher_data data, char buf, int nr)
	{
	/* bits 0..3 reserved, bit 5 write only => mask with 0xd0 */
	return sprintf(buf, "%u\n", data->watchdog[2] & 0xd0);
	}

	static ssize_t set_watchdog_status(struct i2c_client client, struct fscher_data data,
	const char *buf, size_t count, int nr, int reg)
	{
	/* bits 0, 2..7 reserved => mask with 0x02 */
	unsigned long v = simple_strtoul(buf, NULL, 10) & 0x02;

	mutex_lock(&data->update_lock);
	data->watchdog[1] &= ~v;
	fscher_write_value(client, reg, v);
	mutex_unlock(&data->update_lock);
	return count;
	}

	static ssize_t show_watchdog_status(struct fscher_data data, char buf, int nr)
	{
	/* bits 0, 2..7 reserved => mask with 0x02 */
	return sprintf(buf, "%u\n", data->watchdog[1] & 0x02);
	}

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

	mutex_lock(&data->update_lock);
	data->watchdog[0] = v;
	fscher_write_value(client, reg, data->watchdog[0]);
	mutex_unlock(&data->update_lock);
	return count;
	}

	static ssize_t show_watchdog_preset(struct fscher_data data, char buf, int nr)
	{
	return sprintf(buf, "%u\n", data->watchdog[0]);
	}

	static int __init sensors_fscher_init(void)
	{
	return i2c_add_driver(&fscher_driver);
	}

	static void __exit sensors_fscher_exit(void)
	{
	i2c_del_driver(&fscher_driver);
	}

	MODULE_AUTHOR("Reinhard Nissl <rnissl@gmx.de>");
	MODULE_DESCRIPTION("FSC Hermes driver");
	MODULE_LICENSE("GPL");

	module_init(sensors_fscher_init);
	module_exit(sensors_fscher_exit);