diff --git a/drivers/hwmon/vt8231.c b/drivers/hwmon/vt8231.c
new file mode 100644
index 0000000..367b5eb
--- /dev/null
+++ b/drivers/hwmon/vt8231.c
@@ -0,0 +1,1073 @@
+/*
+ * vt8231.c - Part of lm_sensors, Linux kernel modules
+ *	      for hardware monitoring
+ *
+ * Copyright (c) 2005 Roger Lucas <vt8231@hiddenengine.co.uk>
+ * Copyright (c) 2002 Mark D. Studebaker <mdsxyz123@yahoo.com>
+ *		      Aaron M. Marsh <amarsh@sdf.lonestar.org>
+ *
+ * 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.
+ */
+
+/*
+ * Supports VIA VT8231 South Bridge embedded sensors
+ */
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/slab.h>
+#include <linux/pci.h>
+#include <linux/jiffies.h>
+#include <linux/platform_device.h>
+#include <linux/hwmon.h>
+#include <linux/hwmon-sysfs.h>
+#include <linux/hwmon-vid.h>
+#include <linux/err.h>
+#include <linux/mutex.h>
+#include <linux/acpi.h>
+#include <linux/io.h>
+
+static int force_addr;
+module_param(force_addr, int, 0);
+MODULE_PARM_DESC(force_addr, "Initialize the base address of the sensors");
+
+static struct platform_device *pdev;
+
+#define VT8231_EXTENT 0x80
+#define VT8231_BASE_REG 0x70
+#define VT8231_ENABLE_REG 0x74
+
+/*
+ * The VT8231 registers
+ *
+ * The reset value for the input channel configuration is used (Reg 0x4A=0x07)
+ * which sets the selected inputs marked with '*' below if multiple options are
+ * possible:
+ *
+ *		    Voltage Mode	  Temperature Mode
+ *	Sensor	      Linux Id	      Linux Id	      VIA Id
+ *	--------      --------	      --------	      ------
+ *	CPU Diode	N/A		temp1		0
+ *	UIC1		in0		temp2 *		1
+ *	UIC2		in1 *		temp3		2
+ *	UIC3		in2 *		temp4		3
+ *	UIC4		in3 *		temp5		4
+ *	UIC5		in4 *		temp6		5
+ *	3.3V		in5		N/A
+ *
+ * Note that the BIOS may set the configuration register to a different value
+ * to match the motherboard configuration.
+ */
+
+/* fans numbered 0-1 */
+#define VT8231_REG_FAN_MIN(nr)	(0x3b + (nr))
+#define VT8231_REG_FAN(nr)	(0x29 + (nr))
+
+/* Voltage inputs numbered 0-5 */
+
+static const u8 regvolt[]    = { 0x21, 0x22, 0x23, 0x24, 0x25, 0x26 };
+static const u8 regvoltmax[] = { 0x3d, 0x2b, 0x2d, 0x2f, 0x31, 0x33 };
+static const u8 regvoltmin[] = { 0x3e, 0x2c, 0x2e, 0x30, 0x32, 0x34 };
+
+/*
+ * Temperatures are numbered 1-6 according to the Linux kernel specification.
+ *
+ * In the VIA datasheet, however, the temperatures are numbered from zero.
+ * Since it is important that this driver can easily be compared to the VIA
+ * datasheet, we will use the VIA numbering within this driver and map the
+ * kernel sysfs device name to the VIA number in the sysfs callback.
+ */
+
+#define VT8231_REG_TEMP_LOW01	0x49
+#define VT8231_REG_TEMP_LOW25	0x4d
+
+static const u8 regtemp[]    = { 0x1f, 0x21, 0x22, 0x23, 0x24, 0x25 };
+static const u8 regtempmax[] = { 0x39, 0x3d, 0x2b, 0x2d, 0x2f, 0x31 };
+static const u8 regtempmin[] = { 0x3a, 0x3e, 0x2c, 0x2e, 0x30, 0x32 };
+
+#define TEMP_FROM_REG(reg)		(((253 * 4 - (reg)) * 550 + 105) / 210)
+#define TEMP_MAXMIN_FROM_REG(reg)	(((253 - (reg)) * 2200 + 105) / 210)
+#define TEMP_MAXMIN_TO_REG(val)		(253 - ((val) * 210 + 1100) / 2200)
+
+#define VT8231_REG_CONFIG 0x40
+#define VT8231_REG_ALARM1 0x41
+#define VT8231_REG_ALARM2 0x42
+#define VT8231_REG_FANDIV 0x47
+#define VT8231_REG_UCH_CONFIG 0x4a
+#define VT8231_REG_TEMP1_CONFIG 0x4b
+#define VT8231_REG_TEMP2_CONFIG 0x4c
+
+/*
+ * temps 0-5 as numbered in VIA datasheet - see later for mapping to Linux
+ * numbering
+ */
+#define ISTEMP(i, ch_config) ((i) == 0 ? 1 : \
+			      ((ch_config) >> ((i)+1)) & 0x01)
+/* voltages 0-5 */
+#define ISVOLT(i, ch_config) ((i) == 5 ? 1 : \
+			      !(((ch_config) >> ((i)+2)) & 0x01))
+
+#define DIV_FROM_REG(val) (1 << (val))
+
+/*
+ * NB  The values returned here are NOT temperatures.  The calibration curves
+ *     for the thermistor curves are board-specific and must go in the
+ *     sensors.conf file.  Temperature sensors are actually ten bits, but the
+ *     VIA datasheet only considers the 8 MSBs obtained from the regtemp[]
+ *     register.  The temperature value returned should have a magnitude of 3,
+ *     so we use the VIA scaling as the "true" scaling and use the remaining 2
+ *     LSBs as fractional precision.
+ *
+ *     All the on-chip hardware temperature comparisons for the alarms are only
+ *     8-bits wide, and compare against the 8 MSBs of the temperature.  The bits
+ *     in the registers VT8231_REG_TEMP_LOW01 and VT8231_REG_TEMP_LOW25 are
+ *     ignored.
+ */
+
+/*
+ ****** FAN RPM CONVERSIONS ********
+ * This chip saturates back at 0, not at 255 like many the other chips.
+ * So, 0 means 0 RPM
+ */
+static inline u8 FAN_TO_REG(long rpm, int div)
+{
+	if (rpm <= 0 || rpm > 1310720)
+		return 0;
+	return clamp_val(1310720 / (rpm * div), 1, 255);
+}
+
+#define FAN_FROM_REG(val, div) ((val) == 0 ? 0 : 1310720 / ((val) * (div)))
+
+struct vt8231_data {
+	unsigned short addr;
+	const char *name;
+
+	struct mutex update_lock;
+	struct device *hwmon_dev;
+	char valid;		/* !=0 if following fields are valid */
+	unsigned long last_updated;	/* In jiffies */
+
+	u8 in[6];		/* Register value */
+	u8 in_max[6];		/* Register value */
+	u8 in_min[6];		/* Register value */
+	u16 temp[6];		/* Register value 10 bit, right aligned */
+	u8 temp_max[6];		/* Register value */
+	u8 temp_min[6];		/* Register value */
+	u8 fan[2];		/* Register value */
+	u8 fan_min[2];		/* Register value */
+	u8 fan_div[2];		/* Register encoding, shifted right */
+	u16 alarms;		/* Register encoding */
+	u8 uch_config;
+};
+
+static struct pci_dev *s_bridge;
+static int vt8231_probe(struct platform_device *pdev);
+static int vt8231_remove(struct platform_device *pdev);
+static struct vt8231_data *vt8231_update_device(struct device *dev);
+static void vt8231_init_device(struct vt8231_data *data);
+
+static inline int vt8231_read_value(struct vt8231_data *data, u8 reg)
+{
+	return inb_p(data->addr + reg);
+}
+
+static inline void vt8231_write_value(struct vt8231_data *data, u8 reg,
+					u8 value)
+{
+	outb_p(value, data->addr + reg);
+}
+
+/* following are the sysfs callback functions */
+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 vt8231_data *data = vt8231_update_device(dev);
+
+	return sprintf(buf, "%d\n", ((data->in[nr] - 3) * 10000) / 958);
+}
+
+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 vt8231_data *data = vt8231_update_device(dev);
+
+	return sprintf(buf, "%d\n", ((data->in_min[nr] - 3) * 10000) / 958);
+}
+
+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 vt8231_data *data = vt8231_update_device(dev);
+
+	return sprintf(buf, "%d\n", (((data->in_max[nr] - 3) * 10000) / 958));
+}
+
+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 vt8231_data *data = dev_get_drvdata(dev);
+	unsigned long val;
+	int err;
+
+	err = kstrtoul(buf, 10, &val);
+	if (err)
+		return err;
+
+	mutex_lock(&data->update_lock);
+	data->in_min[nr] = clamp_val(((val * 958) / 10000) + 3, 0, 255);
+	vt8231_write_value(data, regvoltmin[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 vt8231_data *data = dev_get_drvdata(dev);
+	unsigned long val;
+	int err;
+
+	err = kstrtoul(buf, 10, &val);
+	if (err)
+		return err;
+
+	mutex_lock(&data->update_lock);
+	data->in_max[nr] = clamp_val(((val * 958) / 10000) + 3, 0, 255);
+	vt8231_write_value(data, regvoltmax[nr], data->in_max[nr]);
+	mutex_unlock(&data->update_lock);
+	return count;
+}
+
+/* Special case for input 5 as this has 3.3V scaling built into the chip */
+static ssize_t in5_input_show(struct device *dev,
+			      struct device_attribute *attr, char *buf)
+{
+	struct vt8231_data *data = vt8231_update_device(dev);
+
+	return sprintf(buf, "%d\n",
+		(((data->in[5] - 3) * 10000 * 54) / (958 * 34)));
+}
+
+static ssize_t in5_min_show(struct device *dev, struct device_attribute *attr,
+		char *buf)
+{
+	struct vt8231_data *data = vt8231_update_device(dev);
+
+	return sprintf(buf, "%d\n",
+		(((data->in_min[5] - 3) * 10000 * 54) / (958 * 34)));
+}
+
+static ssize_t in5_max_show(struct device *dev, struct device_attribute *attr,
+		char *buf)
+{
+	struct vt8231_data *data = vt8231_update_device(dev);
+
+	return sprintf(buf, "%d\n",
+		(((data->in_max[5] - 3) * 10000 * 54) / (958 * 34)));
+}
+
+static ssize_t in5_min_store(struct device *dev,
+			     struct device_attribute *attr, const char *buf,
+			     size_t count)
+{
+	struct vt8231_data *data = dev_get_drvdata(dev);
+	unsigned long val;
+	int err;
+
+	err = kstrtoul(buf, 10, &val);
+	if (err)
+		return err;
+
+	mutex_lock(&data->update_lock);
+	data->in_min[5] = clamp_val(((val * 958 * 34) / (10000 * 54)) + 3,
+				    0, 255);
+	vt8231_write_value(data, regvoltmin[5], data->in_min[5]);
+	mutex_unlock(&data->update_lock);
+	return count;
+}
+
+static ssize_t in5_max_store(struct device *dev,
+			     struct device_attribute *attr, const char *buf,
+			     size_t count)
+{
+	struct vt8231_data *data = dev_get_drvdata(dev);
+	unsigned long val;
+	int err;
+
+	err = kstrtoul(buf, 10, &val);
+	if (err)
+		return err;
+
+	mutex_lock(&data->update_lock);
+	data->in_max[5] = clamp_val(((val * 958 * 34) / (10000 * 54)) + 3,
+				    0, 255);
+	vt8231_write_value(data, regvoltmax[5], data->in_max[5]);
+	mutex_unlock(&data->update_lock);
+	return count;
+}
+
+#define define_voltage_sysfs(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)
+
+define_voltage_sysfs(0);
+define_voltage_sysfs(1);
+define_voltage_sysfs(2);
+define_voltage_sysfs(3);
+define_voltage_sysfs(4);
+
+static DEVICE_ATTR_RO(in5_input);
+static DEVICE_ATTR_RW(in5_min);
+static DEVICE_ATTR_RW(in5_max);
+
+/* Temperatures */
+static ssize_t temp1_input_show(struct device *dev,
+				struct device_attribute *attr, char *buf)
+{
+	struct vt8231_data *data = vt8231_update_device(dev);
+	return sprintf(buf, "%d\n", data->temp[0] * 250);
+}
+
+static ssize_t temp1_max_show(struct device *dev, struct device_attribute *attr,
+		char *buf)
+{
+	struct vt8231_data *data = vt8231_update_device(dev);
+	return sprintf(buf, "%d\n", data->temp_max[0] * 1000);
+}
+
+static ssize_t temp1_max_hyst_show(struct device *dev,
+				   struct device_attribute *attr, char *buf)
+{
+	struct vt8231_data *data = vt8231_update_device(dev);
+	return sprintf(buf, "%d\n", data->temp_min[0] * 1000);
+}
+
+static ssize_t temp1_max_store(struct device *dev,
+			       struct device_attribute *attr, const char *buf,
+			       size_t count)
+{
+	struct vt8231_data *data = dev_get_drvdata(dev);
+	long val;
+	int err;
+
+	err = kstrtol(buf, 10, &val);
+	if (err)
+		return err;
+
+	mutex_lock(&data->update_lock);
+	data->temp_max[0] = clamp_val((val + 500) / 1000, 0, 255);
+	vt8231_write_value(data, regtempmax[0], data->temp_max[0]);
+	mutex_unlock(&data->update_lock);
+	return count;
+}
+static ssize_t temp1_max_hyst_store(struct device *dev,
+				    struct device_attribute *attr,
+				    const char *buf, size_t count)
+{
+	struct vt8231_data *data = dev_get_drvdata(dev);
+	long val;
+	int err;
+
+	err = kstrtol(buf, 10, &val);
+	if (err)
+		return err;
+
+	mutex_lock(&data->update_lock);
+	data->temp_min[0] = clamp_val((val + 500) / 1000, 0, 255);
+	vt8231_write_value(data, regtempmin[0], data->temp_min[0]);
+	mutex_unlock(&data->update_lock);
+	return count;
+}
+
+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 vt8231_data *data = vt8231_update_device(dev);
+	return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp[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 vt8231_data *data = vt8231_update_device(dev);
+	return sprintf(buf, "%d\n", TEMP_MAXMIN_FROM_REG(data->temp_max[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 vt8231_data *data = vt8231_update_device(dev);
+	return sprintf(buf, "%d\n", TEMP_MAXMIN_FROM_REG(data->temp_min[nr]));
+}
+
+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 vt8231_data *data = dev_get_drvdata(dev);
+	long val;
+	int err;
+
+	err = kstrtol(buf, 10, &val);
+	if (err)
+		return err;
+
+	mutex_lock(&data->update_lock);
+	data->temp_max[nr] = clamp_val(TEMP_MAXMIN_TO_REG(val), 0, 255);
+	vt8231_write_value(data, regtempmax[nr], data->temp_max[nr]);
+	mutex_unlock(&data->update_lock);
+	return count;
+}
+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 vt8231_data *data = dev_get_drvdata(dev);
+	long val;
+	int err;
+
+	err = kstrtol(buf, 10, &val);
+	if (err)
+		return err;
+
+	mutex_lock(&data->update_lock);
+	data->temp_min[nr] = clamp_val(TEMP_MAXMIN_TO_REG(val), 0, 255);
+	vt8231_write_value(data, regtempmin[nr], data->temp_min[nr]);
+	mutex_unlock(&data->update_lock);
+	return count;
+}
+
+/*
+ * Note that these map the Linux temperature sensor numbering (1-6) to the VIA
+ * temperature sensor numbering (0-5)
+ */
+#define define_temperature_sysfs(offset)				\
+static SENSOR_DEVICE_ATTR(temp##offset##_input, S_IRUGO,		\
+		show_temp, NULL, offset - 1);				\
+static SENSOR_DEVICE_ATTR(temp##offset##_max, S_IRUGO | S_IWUSR,	\
+		show_temp_max, set_temp_max, offset - 1);		\
+static SENSOR_DEVICE_ATTR(temp##offset##_max_hyst, S_IRUGO | S_IWUSR,	\
+		show_temp_min, set_temp_min, offset - 1)
+
+static DEVICE_ATTR_RO(temp1_input);
+static DEVICE_ATTR_RW(temp1_max);
+static DEVICE_ATTR_RW(temp1_max_hyst);
+
+define_temperature_sysfs(2);
+define_temperature_sysfs(3);
+define_temperature_sysfs(4);
+define_temperature_sysfs(5);
+define_temperature_sysfs(6);
+
+/* Fans */
+static ssize_t show_fan(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 vt8231_data *data = vt8231_update_device(dev);
+	return sprintf(buf, "%d\n", FAN_FROM_REG(data->fan[nr],
+				DIV_FROM_REG(data->fan_div[nr])));
+}
+
+static ssize_t show_fan_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 vt8231_data *data = vt8231_update_device(dev);
+	return sprintf(buf, "%d\n", FAN_FROM_REG(data->fan_min[nr],
+			DIV_FROM_REG(data->fan_div[nr])));
+}
+
+static ssize_t show_fan_div(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 vt8231_data *data = vt8231_update_device(dev);
+	return sprintf(buf, "%d\n", DIV_FROM_REG(data->fan_div[nr]));
+}
+
+static ssize_t set_fan_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 vt8231_data *data = dev_get_drvdata(dev);
+	unsigned long val;
+	int err;
+
+	err = kstrtoul(buf, 10, &val);
+	if (err)
+		return err;
+
+	mutex_lock(&data->update_lock);
+	data->fan_min[nr] = FAN_TO_REG(val, DIV_FROM_REG(data->fan_div[nr]));
+	vt8231_write_value(data, VT8231_REG_FAN_MIN(nr), data->fan_min[nr]);
+	mutex_unlock(&data->update_lock);
+	return count;
+}
+
+static ssize_t set_fan_div(struct device *dev, struct device_attribute *attr,
+		const char *buf, size_t count)
+{
+	struct vt8231_data *data = dev_get_drvdata(dev);
+	struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
+	unsigned long val;
+	int nr = sensor_attr->index;
+	int old = vt8231_read_value(data, VT8231_REG_FANDIV);
+	long min = FAN_FROM_REG(data->fan_min[nr],
+				 DIV_FROM_REG(data->fan_div[nr]));
+	int err;
+
+	err = kstrtoul(buf, 10, &val);
+	if (err)
+		return err;
+
+	mutex_lock(&data->update_lock);
+	switch (val) {
+	case 1:
+		data->fan_div[nr] = 0;
+		break;
+	case 2:
+		data->fan_div[nr] = 1;
+		break;
+	case 4:
+		data->fan_div[nr] = 2;
+		break;
+	case 8:
+		data->fan_div[nr] = 3;
+		break;
+	default:
+		dev_err(dev,
+			"fan_div value %ld not supported. Choose one of 1, 2, 4 or 8!\n",
+			val);
+		mutex_unlock(&data->update_lock);
+		return -EINVAL;
+	}
+
+	/* Correct the fan minimum speed */
+	data->fan_min[nr] = FAN_TO_REG(min, DIV_FROM_REG(data->fan_div[nr]));
+	vt8231_write_value(data, VT8231_REG_FAN_MIN(nr), data->fan_min[nr]);
+
+	old = (old & 0x0f) | (data->fan_div[1] << 6) | (data->fan_div[0] << 4);
+	vt8231_write_value(data, VT8231_REG_FANDIV, old);
+	mutex_unlock(&data->update_lock);
+	return count;
+}
+
+
+#define define_fan_sysfs(offset)					\
+static SENSOR_DEVICE_ATTR(fan##offset##_input, S_IRUGO,			\
+		show_fan, NULL, offset - 1);				\
+static SENSOR_DEVICE_ATTR(fan##offset##_div, S_IRUGO | S_IWUSR,		\
+		show_fan_div, set_fan_div, offset - 1);			\
+static SENSOR_DEVICE_ATTR(fan##offset##_min, S_IRUGO | S_IWUSR,		\
+		show_fan_min, set_fan_min, offset - 1)
+
+define_fan_sysfs(1);
+define_fan_sysfs(2);
+
+/* Alarms */
+static ssize_t alarms_show(struct device *dev, struct device_attribute *attr,
+			   char *buf)
+{
+	struct vt8231_data *data = vt8231_update_device(dev);
+	return sprintf(buf, "%d\n", data->alarms);
+}
+static DEVICE_ATTR_RO(alarms);
+
+static ssize_t show_alarm(struct device *dev, struct device_attribute *attr,
+			  char *buf)
+{
+	int bitnr = to_sensor_dev_attr(attr)->index;
+	struct vt8231_data *data = vt8231_update_device(dev);
+	return sprintf(buf, "%u\n", (data->alarms >> bitnr) & 1);
+}
+static SENSOR_DEVICE_ATTR(temp1_alarm, S_IRUGO, show_alarm, NULL, 4);
+static SENSOR_DEVICE_ATTR(temp2_alarm, S_IRUGO, show_alarm, NULL, 11);
+static SENSOR_DEVICE_ATTR(temp3_alarm, S_IRUGO, show_alarm, NULL, 0);
+static SENSOR_DEVICE_ATTR(temp4_alarm, S_IRUGO, show_alarm, NULL, 1);
+static SENSOR_DEVICE_ATTR(temp5_alarm, S_IRUGO, show_alarm, NULL, 3);
+static SENSOR_DEVICE_ATTR(temp6_alarm, S_IRUGO, show_alarm, NULL, 8);
+static SENSOR_DEVICE_ATTR(in0_alarm, S_IRUGO, show_alarm, NULL, 11);
+static SENSOR_DEVICE_ATTR(in1_alarm, S_IRUGO, show_alarm, NULL, 0);
+static SENSOR_DEVICE_ATTR(in2_alarm, S_IRUGO, show_alarm, NULL, 1);
+static SENSOR_DEVICE_ATTR(in3_alarm, S_IRUGO, show_alarm, NULL, 3);
+static SENSOR_DEVICE_ATTR(in4_alarm, S_IRUGO, show_alarm, NULL, 8);
+static SENSOR_DEVICE_ATTR(in5_alarm, S_IRUGO, show_alarm, NULL, 2);
+static SENSOR_DEVICE_ATTR(fan1_alarm, S_IRUGO, show_alarm, NULL, 6);
+static SENSOR_DEVICE_ATTR(fan2_alarm, S_IRUGO, show_alarm, NULL, 7);
+
+static ssize_t name_show(struct device *dev, struct device_attribute
+			 *devattr, char *buf)
+{
+	struct vt8231_data *data = dev_get_drvdata(dev);
+	return sprintf(buf, "%s\n", data->name);
+}
+static DEVICE_ATTR_RO(name);
+
+static struct attribute *vt8231_attributes_temps[6][5] = {
+	{
+		&dev_attr_temp1_input.attr,
+		&dev_attr_temp1_max_hyst.attr,
+		&dev_attr_temp1_max.attr,
+		&sensor_dev_attr_temp1_alarm.dev_attr.attr,
+		NULL
+	}, {
+		&sensor_dev_attr_temp2_input.dev_attr.attr,
+		&sensor_dev_attr_temp2_max_hyst.dev_attr.attr,
+		&sensor_dev_attr_temp2_max.dev_attr.attr,
+		&sensor_dev_attr_temp2_alarm.dev_attr.attr,
+		NULL
+	}, {
+		&sensor_dev_attr_temp3_input.dev_attr.attr,
+		&sensor_dev_attr_temp3_max_hyst.dev_attr.attr,
+		&sensor_dev_attr_temp3_max.dev_attr.attr,
+		&sensor_dev_attr_temp3_alarm.dev_attr.attr,
+		NULL
+	}, {
+		&sensor_dev_attr_temp4_input.dev_attr.attr,
+		&sensor_dev_attr_temp4_max_hyst.dev_attr.attr,
+		&sensor_dev_attr_temp4_max.dev_attr.attr,
+		&sensor_dev_attr_temp4_alarm.dev_attr.attr,
+		NULL
+	}, {
+		&sensor_dev_attr_temp5_input.dev_attr.attr,
+		&sensor_dev_attr_temp5_max_hyst.dev_attr.attr,
+		&sensor_dev_attr_temp5_max.dev_attr.attr,
+		&sensor_dev_attr_temp5_alarm.dev_attr.attr,
+		NULL
+	}, {
+		&sensor_dev_attr_temp6_input.dev_attr.attr,
+		&sensor_dev_attr_temp6_max_hyst.dev_attr.attr,
+		&sensor_dev_attr_temp6_max.dev_attr.attr,
+		&sensor_dev_attr_temp6_alarm.dev_attr.attr,
+		NULL
+	}
+};
+
+static const struct attribute_group vt8231_group_temps[6] = {
+	{ .attrs = vt8231_attributes_temps[0] },
+	{ .attrs = vt8231_attributes_temps[1] },
+	{ .attrs = vt8231_attributes_temps[2] },
+	{ .attrs = vt8231_attributes_temps[3] },
+	{ .attrs = vt8231_attributes_temps[4] },
+	{ .attrs = vt8231_attributes_temps[5] },
+};
+
+static struct attribute *vt8231_attributes_volts[6][5] = {
+	{
+		&sensor_dev_attr_in0_input.dev_attr.attr,
+		&sensor_dev_attr_in0_min.dev_attr.attr,
+		&sensor_dev_attr_in0_max.dev_attr.attr,
+		&sensor_dev_attr_in0_alarm.dev_attr.attr,
+		NULL
+	}, {
+		&sensor_dev_attr_in1_input.dev_attr.attr,
+		&sensor_dev_attr_in1_min.dev_attr.attr,
+		&sensor_dev_attr_in1_max.dev_attr.attr,
+		&sensor_dev_attr_in1_alarm.dev_attr.attr,
+		NULL
+	}, {
+		&sensor_dev_attr_in2_input.dev_attr.attr,
+		&sensor_dev_attr_in2_min.dev_attr.attr,
+		&sensor_dev_attr_in2_max.dev_attr.attr,
+		&sensor_dev_attr_in2_alarm.dev_attr.attr,
+		NULL
+	}, {
+		&sensor_dev_attr_in3_input.dev_attr.attr,
+		&sensor_dev_attr_in3_min.dev_attr.attr,
+		&sensor_dev_attr_in3_max.dev_attr.attr,
+		&sensor_dev_attr_in3_alarm.dev_attr.attr,
+		NULL
+	}, {
+		&sensor_dev_attr_in4_input.dev_attr.attr,
+		&sensor_dev_attr_in4_min.dev_attr.attr,
+		&sensor_dev_attr_in4_max.dev_attr.attr,
+		&sensor_dev_attr_in4_alarm.dev_attr.attr,
+		NULL
+	}, {
+		&dev_attr_in5_input.attr,
+		&dev_attr_in5_min.attr,
+		&dev_attr_in5_max.attr,
+		&sensor_dev_attr_in5_alarm.dev_attr.attr,
+		NULL
+	}
+};
+
+static const struct attribute_group vt8231_group_volts[6] = {
+	{ .attrs = vt8231_attributes_volts[0] },
+	{ .attrs = vt8231_attributes_volts[1] },
+	{ .attrs = vt8231_attributes_volts[2] },
+	{ .attrs = vt8231_attributes_volts[3] },
+	{ .attrs = vt8231_attributes_volts[4] },
+	{ .attrs = vt8231_attributes_volts[5] },
+};
+
+static struct attribute *vt8231_attributes[] = {
+	&sensor_dev_attr_fan1_input.dev_attr.attr,
+	&sensor_dev_attr_fan2_input.dev_attr.attr,
+	&sensor_dev_attr_fan1_min.dev_attr.attr,
+	&sensor_dev_attr_fan2_min.dev_attr.attr,
+	&sensor_dev_attr_fan1_div.dev_attr.attr,
+	&sensor_dev_attr_fan2_div.dev_attr.attr,
+	&sensor_dev_attr_fan1_alarm.dev_attr.attr,
+	&sensor_dev_attr_fan2_alarm.dev_attr.attr,
+	&dev_attr_alarms.attr,
+	&dev_attr_name.attr,
+	NULL
+};
+
+static const struct attribute_group vt8231_group = {
+	.attrs = vt8231_attributes,
+};
+
+static struct platform_driver vt8231_driver = {
+	.driver = {
+		.name	= "vt8231",
+	},
+	.probe	= vt8231_probe,
+	.remove	= vt8231_remove,
+};
+
+static const struct pci_device_id vt8231_pci_ids[] = {
+	{ PCI_DEVICE(PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_8231_4) },
+	{ 0, }
+};
+
+MODULE_DEVICE_TABLE(pci, vt8231_pci_ids);
+
+static int vt8231_pci_probe(struct pci_dev *dev,
+				      const struct pci_device_id *id);
+
+static struct pci_driver vt8231_pci_driver = {
+	.name		= "vt8231",
+	.id_table	= vt8231_pci_ids,
+	.probe		= vt8231_pci_probe,
+};
+
+static int vt8231_probe(struct platform_device *pdev)
+{
+	struct resource *res;
+	struct vt8231_data *data;
+	int err = 0, i;
+
+	/* Reserve the ISA region */
+	res = platform_get_resource(pdev, IORESOURCE_IO, 0);
+	if (!devm_request_region(&pdev->dev, res->start, VT8231_EXTENT,
+				 vt8231_driver.driver.name)) {
+		dev_err(&pdev->dev, "Region 0x%lx-0x%lx already in use!\n",
+			(unsigned long)res->start, (unsigned long)res->end);
+		return -ENODEV;
+	}
+
+	data = devm_kzalloc(&pdev->dev, sizeof(struct vt8231_data), GFP_KERNEL);
+	if (!data)
+		return -ENOMEM;
+
+	platform_set_drvdata(pdev, data);
+	data->addr = res->start;
+	data->name = "vt8231";
+
+	mutex_init(&data->update_lock);
+	vt8231_init_device(data);
+
+	/* Register sysfs hooks */
+	err = sysfs_create_group(&pdev->dev.kobj, &vt8231_group);
+	if (err)
+		return err;
+
+	/* Must update device information to find out the config field */
+	data->uch_config = vt8231_read_value(data, VT8231_REG_UCH_CONFIG);
+
+	for (i = 0; i < ARRAY_SIZE(vt8231_group_temps); i++) {
+		if (ISTEMP(i, data->uch_config)) {
+			err = sysfs_create_group(&pdev->dev.kobj,
+						 &vt8231_group_temps[i]);
+			if (err)
+				goto exit_remove_files;
+		}
+	}
+
+	for (i = 0; i < ARRAY_SIZE(vt8231_group_volts); i++) {
+		if (ISVOLT(i, data->uch_config)) {
+			err = sysfs_create_group(&pdev->dev.kobj,
+						 &vt8231_group_volts[i]);
+			if (err)
+				goto exit_remove_files;
+		}
+	}
+
+	data->hwmon_dev = hwmon_device_register(&pdev->dev);
+	if (IS_ERR(data->hwmon_dev)) {
+		err = PTR_ERR(data->hwmon_dev);
+		goto exit_remove_files;
+	}
+	return 0;
+
+exit_remove_files:
+	for (i = 0; i < ARRAY_SIZE(vt8231_group_volts); i++)
+		sysfs_remove_group(&pdev->dev.kobj, &vt8231_group_volts[i]);
+
+	for (i = 0; i < ARRAY_SIZE(vt8231_group_temps); i++)
+		sysfs_remove_group(&pdev->dev.kobj, &vt8231_group_temps[i]);
+
+	sysfs_remove_group(&pdev->dev.kobj, &vt8231_group);
+	return err;
+}
+
+static int vt8231_remove(struct platform_device *pdev)
+{
+	struct vt8231_data *data = platform_get_drvdata(pdev);
+	int i;
+
+	hwmon_device_unregister(data->hwmon_dev);
+
+	for (i = 0; i < ARRAY_SIZE(vt8231_group_volts); i++)
+		sysfs_remove_group(&pdev->dev.kobj, &vt8231_group_volts[i]);
+
+	for (i = 0; i < ARRAY_SIZE(vt8231_group_temps); i++)
+		sysfs_remove_group(&pdev->dev.kobj, &vt8231_group_temps[i]);
+
+	sysfs_remove_group(&pdev->dev.kobj, &vt8231_group);
+
+	return 0;
+}
+
+static void vt8231_init_device(struct vt8231_data *data)
+{
+	vt8231_write_value(data, VT8231_REG_TEMP1_CONFIG, 0);
+	vt8231_write_value(data, VT8231_REG_TEMP2_CONFIG, 0);
+}
+
+static struct vt8231_data *vt8231_update_device(struct device *dev)
+{
+	struct vt8231_data *data = dev_get_drvdata(dev);
+	int i;
+	u16 low;
+
+	mutex_lock(&data->update_lock);
+
+	if (time_after(jiffies, data->last_updated + HZ + HZ / 2)
+	    || !data->valid) {
+		for (i = 0; i < 6; i++) {
+			if (ISVOLT(i, data->uch_config)) {
+				data->in[i] = vt8231_read_value(data,
+						regvolt[i]);
+				data->in_min[i] = vt8231_read_value(data,
+						regvoltmin[i]);
+				data->in_max[i] = vt8231_read_value(data,
+						regvoltmax[i]);
+			}
+		}
+		for (i = 0; i < 2; i++) {
+			data->fan[i] = vt8231_read_value(data,
+						VT8231_REG_FAN(i));
+			data->fan_min[i] = vt8231_read_value(data,
+						VT8231_REG_FAN_MIN(i));
+		}
+
+		low = vt8231_read_value(data, VT8231_REG_TEMP_LOW01);
+		low = (low >> 6) | ((low & 0x30) >> 2)
+		    | (vt8231_read_value(data, VT8231_REG_TEMP_LOW25) << 4);
+		for (i = 0; i < 6; i++) {
+			if (ISTEMP(i, data->uch_config)) {
+				data->temp[i] = (vt8231_read_value(data,
+						       regtemp[i]) << 2)
+						| ((low >> (2 * i)) & 0x03);
+				data->temp_max[i] = vt8231_read_value(data,
+						      regtempmax[i]);
+				data->temp_min[i] = vt8231_read_value(data,
+						      regtempmin[i]);
+			}
+		}
+
+		i = vt8231_read_value(data, VT8231_REG_FANDIV);
+		data->fan_div[0] = (i >> 4) & 0x03;
+		data->fan_div[1] = i >> 6;
+		data->alarms = vt8231_read_value(data, VT8231_REG_ALARM1) |
+			(vt8231_read_value(data, VT8231_REG_ALARM2) << 8);
+
+		/* Set alarm flags correctly */
+		if (!data->fan[0] && data->fan_min[0])
+			data->alarms |= 0x40;
+		else if (data->fan[0] && !data->fan_min[0])
+			data->alarms &= ~0x40;
+
+		if (!data->fan[1] && data->fan_min[1])
+			data->alarms |= 0x80;
+		else if (data->fan[1] && !data->fan_min[1])
+			data->alarms &= ~0x80;
+
+		data->last_updated = jiffies;
+		data->valid = 1;
+	}
+
+	mutex_unlock(&data->update_lock);
+
+	return data;
+}
+
+static int vt8231_device_add(unsigned short address)
+{
+	struct resource res = {
+		.start	= address,
+		.end	= address + VT8231_EXTENT - 1,
+		.name	= "vt8231",
+		.flags	= IORESOURCE_IO,
+	};
+	int err;
+
+	err = acpi_check_resource_conflict(&res);
+	if (err)
+		goto exit;
+
+	pdev = platform_device_alloc("vt8231", address);
+	if (!pdev) {
+		err = -ENOMEM;
+		pr_err("Device allocation failed\n");
+		goto exit;
+	}
+
+	err = platform_device_add_resources(pdev, &res, 1);
+	if (err) {
+		pr_err("Device resource addition failed (%d)\n", err);
+		goto exit_device_put;
+	}
+
+	err = platform_device_add(pdev);
+	if (err) {
+		pr_err("Device addition failed (%d)\n", err);
+		goto exit_device_put;
+	}
+
+	return 0;
+
+exit_device_put:
+	platform_device_put(pdev);
+exit:
+	return err;
+}
+
+static int vt8231_pci_probe(struct pci_dev *dev,
+				const struct pci_device_id *id)
+{
+	u16 address, val;
+	if (force_addr) {
+		address = force_addr & 0xff00;
+		dev_warn(&dev->dev, "Forcing ISA address 0x%x\n",
+			 address);
+
+		if (PCIBIOS_SUCCESSFUL !=
+		    pci_write_config_word(dev, VT8231_BASE_REG, address | 1))
+			return -ENODEV;
+	}
+
+	if (PCIBIOS_SUCCESSFUL != pci_read_config_word(dev, VT8231_BASE_REG,
+							&val))
+		return -ENODEV;
+
+	address = val & ~(VT8231_EXTENT - 1);
+	if (address == 0) {
+		dev_err(&dev->dev, "base address not set - upgrade BIOS or use force_addr=0xaddr\n");
+		return -ENODEV;
+	}
+
+	if (PCIBIOS_SUCCESSFUL != pci_read_config_word(dev, VT8231_ENABLE_REG,
+							&val))
+		return -ENODEV;
+
+	if (!(val & 0x0001)) {
+		dev_warn(&dev->dev, "enabling sensors\n");
+		if (PCIBIOS_SUCCESSFUL !=
+			pci_write_config_word(dev, VT8231_ENABLE_REG,
+							val | 0x0001))
+			return -ENODEV;
+	}
+
+	if (platform_driver_register(&vt8231_driver))
+		goto exit;
+
+	/* Sets global pdev as a side effect */
+	if (vt8231_device_add(address))
+		goto exit_unregister;
+
+	/*
+	 * Always return failure here.  This is to allow other drivers to bind
+	 * to this pci device.  We don't really want to have control over the
+	 * pci device, we only wanted to read as few register values from it.
+	 */
+
+	/*
+	 * We do, however, mark ourselves as using the PCI device to stop it
+	 * getting unloaded.
+	 */
+	s_bridge = pci_dev_get(dev);
+	return -ENODEV;
+
+exit_unregister:
+	platform_driver_unregister(&vt8231_driver);
+exit:
+	return -ENODEV;
+}
+
+static int __init sm_vt8231_init(void)
+{
+	return pci_register_driver(&vt8231_pci_driver);
+}
+
+static void __exit sm_vt8231_exit(void)
+{
+	pci_unregister_driver(&vt8231_pci_driver);
+	if (s_bridge != NULL) {
+		platform_device_unregister(pdev);
+		platform_driver_unregister(&vt8231_driver);
+		pci_dev_put(s_bridge);
+		s_bridge = NULL;
+	}
+}
+
+MODULE_AUTHOR("Roger Lucas <vt8231@hiddenengine.co.uk>");
+MODULE_DESCRIPTION("VT8231 sensors");
+MODULE_LICENSE("GPL");
+
+module_init(sm_vt8231_init);
+module_exit(sm_vt8231_exit);