Merge /spare/repo/linux-2.6/

1 files changed, 769 insertions, 0 deletions

diff --git a/drivers/hwmon/gl520sm.c b/drivers/hwmon/gl520sm.c
new file mode 100644
index 0000000..80ae8d3
--- /dev/null
+++ b/drivers/hwmon/gl520sm.c
@@ -0,0 +1,769 @@
+/*
+    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/i2c-sensor.h>
+#include <linux/i2c-vid.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 };
+static unsigned int normal_isa[] = { I2C_CLIENT_ISA_END };
+
+/* Insmod parameters */
+SENSORS_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 = {
+	.owner		= THIS_MODULE,
+	.name		= "gl520sm",
+	.id		= I2C_DRIVERID_GL520,
+	.flags		= I2C_DF_NOTIFY,
+	.attach_adapter	= gl520_attach_adapter,
+	.detach_client	= gl520_detach_client,
+};
+
+/* Client data */
+struct gl520_data {
+	struct i2c_client client;
+	struct semaphore 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 device_create_file_vid(client, n) \
+device_create_file(&client->dev, &dev_attr_cpu##n##_vid)
+
+#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 device_create_file_in(client, n) \
+({device_create_file(&client->dev, &dev_attr_in##n##_input); \
+device_create_file(&client->dev, &dev_attr_in##n##_min); \
+device_create_file(&client->dev, &dev_attr_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 device_create_file_fan(client, n) \
+({device_create_file(&client->dev, &dev_attr_fan##n##_input); \
+device_create_file(&client->dev, &dev_attr_fan##n##_min); \
+device_create_file(&client->dev, &dev_attr_fan##n##_div);})
+
+#define sysfs_fan_off(n) \
+sysfs_rw_n(fan, n, _off, GL520_REG_FAN_OFF) \
+
+#define device_create_file_fan_off(client, n) \
+device_create_file(&client->dev, &dev_attr_fan##n##_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 device_create_file_temp(client, n) \
+({device_create_file(&client->dev, &dev_attr_temp##n##_input); \
+device_create_file(&client->dev, &dev_attr_temp##n##_max); \
+device_create_file(&client->dev, &dev_attr_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)
+
+#define device_create_file_alarms(client) \
+({device_create_file(&client->dev, &dev_attr_alarms); \
+device_create_file(&client->dev, &dev_attr_beep_enable); \
+device_create_file(&client->dev, &dev_attr_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;
+
+	down(&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);
+
+	up(&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);
+
+	down(&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);
+
+	up(&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;
+
+	down(&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);
+
+	up(&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;
+	}
+
+	down(&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));
+
+	up(&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;
+
+	down(&data->update_lock);
+	data->fan_off = r;
+	gl520_write_value(client, reg, (gl520_read_value(client, reg) & ~0x0c) | (r << 2));
+	up(&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);
+
+	down(&data->update_lock);
+	data->temp_max[n - 1] = TEMP_TO_REG(v);;
+	gl520_write_value(client, reg, data->temp_max[n - 1]);
+	up(&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);
+
+	down(&data->update_lock);
+	data->temp_max_hyst[n - 1] = TEMP_TO_REG(v);
+	gl520_write_value(client, reg, data->temp_max_hyst[n - 1]);
+	up(&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;
+
+	down(&data->update_lock);
+	data->beep_enable = !r;
+	gl520_write_value(client, reg, (gl520_read_value(client, reg) & ~0x04) | (r << 2));
+	up(&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);
+	
+	down(&data->update_lock);
+	r &= data->alarm_mask;
+	data->beep_mask = r;
+	gl520_write_value(client, reg, r);
+	up(&data->update_lock);
+	return count;
+}
+
+
+/*
+ * Real code
+ */
+
+static int gl520_attach_adapter(struct i2c_adapter *adapter)
+{
+	if (!(adapter->class & I2C_CLASS_HWMON))
+		return 0;
+	return i2c_detect(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 = kmalloc(sizeof(struct gl520_data), GFP_KERNEL))) {
+		err = -ENOMEM;
+		goto exit;
+	}
+	memset(data, 0, sizeof(struct gl520_data));
+
+	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;
+	init_MUTEX(&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 */
+	device_create_file_vid(new_client, 0);
+
+	device_create_file_in(new_client, 0);
+	device_create_file_in(new_client, 1);
+	device_create_file_in(new_client, 2);
+	device_create_file_in(new_client, 3);
+	if (!data->two_temps)
+		device_create_file_in(new_client, 4);
+
+	device_create_file_fan(new_client, 1);
+	device_create_file_fan(new_client, 2);
+	device_create_file_fan_off(new_client, 1);
+
+	device_create_file_temp(new_client, 1);
+	if (data->two_temps)
+		device_create_file_temp(new_client, 2);
+
+	device_create_file_alarms(new_client);
+
+	return 0;
+
+exit_free:
+	kfree(data);
+exit:
+	return err;
+}
+
+
+/* Called when we have found a new GL520SM. */
+static void gl520_init_client(struct i2c_client *client)
+{
+	struct gl520_data *data = i2c_get_clientdata(client);
+	u8 oldconf, conf;
+
+	conf = oldconf = gl520_read_value(client, GL520_REG_CONF);
+
+	data->alarm_mask = 0xff;
+	data->vrm = i2c_which_vrm();
+
+	if (extra_sensor_type == 1)
+		conf &= ~0x10;
+	else if (extra_sensor_type == 2)
+		conf |= 0x10;
+	data->two_temps = !(conf & 0x10);
+
+	/* If IRQ# is disabled, we can safely force comparator mode */
+	if (!(conf & 0x20))
+		conf &= 0xf7;
+
+	/* Enable monitoring if needed */
+	conf |= 0x40;
+
+	if (conf != oldconf)
+		gl520_write_value(client, GL520_REG_CONF, conf);
+
+	gl520_update_device(&(client->dev));
+
+	if (data->fan_min[0] == 0)
+		data->alarm_mask &= ~0x20;
+	if (data->fan_min[1] == 0)
+		data->alarm_mask &= ~0x40;
+
+	data->beep_mask &= data->alarm_mask;
+	gl520_write_value(client, GL520_REG_BEEP_MASK, data->beep_mask);
+}
+
+static int gl520_detach_client(struct i2c_client *client)
+{
+	int err;
+
+	if ((err = i2c_detach_client(client))) {
+		dev_err(&client->dev, "Client deregistration failed, "
+			"client not detached.\n");
+		return err;
+	}
+
+	kfree(i2c_get_clientdata(client));
+	return 0;
+}
+
+
+/* Registers 0x07 to 0x0c are word-sized, others are byte-sized 
+   GL520 uses a high-byte first convention */
+static int gl520_read_value(struct i2c_client *client, u8 reg)
+{
+	if ((reg >= 0x07) && (reg <= 0x0c))
+		return swab16(i2c_smbus_read_word_data(client, reg));
+	else
+		return i2c_smbus_read_byte_data(client, reg);
+}
+
+static int gl520_write_value(struct i2c_client *client, u8 reg, u16 value)
+{
+	if ((reg >= 0x07) && (reg <= 0x0c))
+		return i2c_smbus_write_word_data(client, reg, swab16(value));
+	else
+		return i2c_smbus_write_byte_data(client, reg, value);
+}
+
+
+static struct gl520_data *gl520_update_device(struct device *dev)
+{
+	struct i2c_client *client = to_i2c_client(dev);
+	struct gl520_data *data = i2c_get_clientdata(client);
+	int val;
+
+	down(&data->update_lock);
+
+	if (time_after(jiffies, data->last_updated + 2 * HZ) || !data->valid) {
+
+		dev_dbg(&client->dev, "Starting gl520sm update\n");
+
+		data->alarms = gl520_read_value(client, GL520_REG_ALARMS);
+		data->beep_mask = gl520_read_value(client, GL520_REG_BEEP_MASK);
+		data->vid = gl520_read_value(client, GL520_REG_VID_INPUT) & 0x1f;
+
+		val = gl520_read_value(client, GL520_REG_IN0_LIMIT);
+		data->in_min[0] = val & 0xff;
+		data->in_max[0] = (val >> 8) & 0xff;
+		val = gl520_read_value(client, GL520_REG_IN1_LIMIT);
+		data->in_min[1] = val & 0xff;
+		data->in_max[1] = (val >> 8) & 0xff;
+		val = gl520_read_value(client, GL520_REG_IN2_LIMIT);
+		data->in_min[2] = val & 0xff;
+		data->in_max[2] = (val >> 8) & 0xff;
+		val = gl520_read_value(client, GL520_REG_IN3_LIMIT);
+		data->in_min[3] = val & 0xff;
+		data->in_max[3] = (val >> 8) & 0xff;
+
+		val = gl520_read_value(client, GL520_REG_FAN_INPUT);
+		data->fan_input[0] = (val >> 8) & 0xff;
+		data->fan_input[1] = val & 0xff;
+
+		val = gl520_read_value(client, GL520_REG_FAN_MIN);
+		data->fan_min[0] = (val >> 8) & 0xff;
+		data->fan_min[1] = val & 0xff;
+
+		data->temp_input[0] = gl520_read_value(client, GL520_REG_TEMP1_INPUT);
+		data->temp_max[0] = gl520_read_value(client, GL520_REG_TEMP1_MAX);
+		data->temp_max_hyst[0] = gl520_read_value(client, GL520_REG_TEMP1_MAX_HYST);
+
+		val = gl520_read_value(client, GL520_REG_FAN_DIV);
+		data->fan_div[0] = (val >> 6) & 0x03;
+		data->fan_div[1] = (val >> 4) & 0x03;
+		data->fan_off = (val >> 2) & 0x01;
+
+		data->alarms &= data->alarm_mask;
+
+		val = gl520_read_value(client, GL520_REG_CONF);
+		data->beep_enable = !((val >> 2) & 1);
+
+		data->in_input[0] = gl520_read_value(client, GL520_REG_IN0_INPUT);
+		data->in_input[1] = gl520_read_value(client, GL520_REG_IN1_INPUT);
+		data->in_input[2] = gl520_read_value(client, GL520_REG_IN2_INPUT);
+		data->in_input[3] = gl520_read_value(client, GL520_REG_IN3_INPUT);
+
+		/* Temp1 and Vin4 are the same input */
+		if (data->two_temps) {
+			data->temp_input[1] = gl520_read_value(client, GL520_REG_TEMP2_INPUT);
+			data->temp_max[1] = gl520_read_value(client, GL520_REG_TEMP2_MAX);
+			data->temp_max_hyst[1] = gl520_read_value(client, GL520_REG_TEMP2_MAX_HYST);
+		} else {
+			data->in_input[4] = gl520_read_value(client, GL520_REG_IN4_INPUT);
+			data->in_min[4] = gl520_read_value(client, GL520_REG_IN4_MIN);
+			data->in_max[4] = gl520_read_value(client, GL520_REG_IN4_MAX);
+		}
+
+		data->last_updated = jiffies;
+		data->valid = 1;
+	}
+
+	up(&data->update_lock);
+
+	return data;
+}
+
+
+static int __init sensors_gl520sm_init(void)
+{
+	return i2c_add_driver(&gl520_driver);
+}
+
+static void __exit sensors_gl520sm_exit(void)
+{
+	i2c_del_driver(&gl520_driver);
+}
+
+
+MODULE_AUTHOR("Frodo Looijaard <frodol@dds.nl>, "
+	"Kyösti Mälkki <kmalkki@cc.hut.fi>, "
+	"Maarten Deprez <maartendeprez@users.sourceforge.net>");
+MODULE_DESCRIPTION("GL520SM driver");
+MODULE_LICENSE("GPL");
+
+module_init(sensors_gl520sm_init);
+module_exit(sensors_gl520sm_exit);