vt8231.c 28.9 KB
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/*
	vt8231.c - Part of lm_sensors, Linux kernel modules
				for hardware monitoring

	Copyright (c) 2005 Roger Lucas <roger@planbit.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
*/

#include <linux/module.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/pci.h>
#include <linux/jiffies.h>
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#include <linux/platform_device.h>
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#include <linux/hwmon.h>
#include <linux/hwmon-sysfs.h>
#include <linux/hwmon-vid.h>
#include <linux/err.h>
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#include <linux/mutex.h>
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#include <asm/io.h>

static int force_addr;
module_param(force_addr, int, 0);
MODULE_PARM_DESC(force_addr, "Initialize the base address of the sensors");

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static struct platform_device *pdev;
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#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)
		return 0;
	return SENSORS_LIMIT(1310720 / (rpm * div), 1, 255);
}

#define FAN_FROM_REG(val, div) ((val) == 0 ? 0 : 1310720 / ((val) * (div)))

struct vt8231_data {
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	unsigned short addr;
	const char *name;

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	struct mutex update_lock;
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	struct class_device *class_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;
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static int vt8231_probe(struct platform_device *pdev);
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static int __devexit vt8231_remove(struct platform_device *pdev);
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static struct vt8231_data *vt8231_update_device(struct device *dev);
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static void vt8231_init_device(struct vt8231_data *data);
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static inline int vt8231_read_value(struct vt8231_data *data, u8 reg)
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{
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	return inb_p(data->addr + reg);
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}

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static inline void vt8231_write_value(struct vt8231_data *data, u8 reg,
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					u8 value)
{
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	outb_p(value, data->addr + reg);
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}

/* 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;
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	struct vt8231_data *data = dev_get_drvdata(dev);
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	unsigned long val = simple_strtoul(buf, NULL, 10);

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	mutex_lock(&data->update_lock);
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	data->in_min[nr] = SENSORS_LIMIT(((val * 958) / 10000) + 3, 0, 255);
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	vt8231_write_value(data, regvoltmin[nr], data->in_min[nr]);
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	mutex_unlock(&data->update_lock);
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	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;
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	struct vt8231_data *data = dev_get_drvdata(dev);
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	unsigned long val = simple_strtoul(buf, NULL, 10);

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	mutex_lock(&data->update_lock);
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	data->in_max[nr] = SENSORS_LIMIT(((val * 958) / 10000) + 3, 0, 255);
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	vt8231_write_value(data, regvoltmax[nr], data->in_max[nr]);
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	mutex_unlock(&data->update_lock);
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	return count;
}

/* Special case for input 5 as this has 3.3V scaling built into the chip */
static ssize_t show_in5(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 show_in5_min(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 show_in5_max(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 set_in5_min(struct device *dev, struct device_attribute *attr,
		const char *buf, size_t count)
{
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	struct vt8231_data *data = dev_get_drvdata(dev);
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	unsigned long val = simple_strtoul(buf, NULL, 10);

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	mutex_lock(&data->update_lock);
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	data->in_min[5] = SENSORS_LIMIT(((val * 958 * 34) / (10000 * 54)) + 3,
					0, 255);
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	vt8231_write_value(data, regvoltmin[5], data->in_min[5]);
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	mutex_unlock(&data->update_lock);
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	return count;
}

static ssize_t set_in5_max(struct device *dev, struct device_attribute *attr,
		const char *buf, size_t count)
{
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	struct vt8231_data *data = dev_get_drvdata(dev);
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	unsigned long val = simple_strtoul(buf, NULL, 10);

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	mutex_lock(&data->update_lock);
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	data->in_max[5] = SENSORS_LIMIT(((val * 958 * 34) / (10000 * 54)) + 3,
					0, 255);
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	vt8231_write_value(data, regvoltmax[5], data->in_max[5]);
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	mutex_unlock(&data->update_lock);
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	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(in5_input, S_IRUGO, show_in5, NULL);
static DEVICE_ATTR(in5_min, S_IRUGO | S_IWUSR, show_in5_min, set_in5_min);
static DEVICE_ATTR(in5_max, S_IRUGO | S_IWUSR, show_in5_max, set_in5_max);

/* Temperatures */
static ssize_t show_temp0(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 show_temp0_max(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 show_temp0_min(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 set_temp0_max(struct device *dev, struct device_attribute *attr,
		const char *buf, size_t count)
{
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	struct vt8231_data *data = dev_get_drvdata(dev);
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	int val = simple_strtol(buf, NULL, 10);

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	mutex_lock(&data->update_lock);
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	data->temp_max[0] = SENSORS_LIMIT((val + 500) / 1000, 0, 255);
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	vt8231_write_value(data, regtempmax[0], data->temp_max[0]);
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	mutex_unlock(&data->update_lock);
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	return count;
}
static ssize_t set_temp0_min(struct device *dev, struct device_attribute *attr,
		const char *buf, size_t count)
{
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	struct vt8231_data *data = dev_get_drvdata(dev);
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	int val = simple_strtol(buf, NULL, 10);

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	mutex_lock(&data->update_lock);
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	data->temp_min[0] = SENSORS_LIMIT((val + 500) / 1000, 0, 255);
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	vt8231_write_value(data, regtempmin[0], data->temp_min[0]);
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	mutex_unlock(&data->update_lock);
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	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;
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	struct vt8231_data *data = dev_get_drvdata(dev);
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	int val = simple_strtol(buf, NULL, 10);

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	mutex_lock(&data->update_lock);
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	data->temp_max[nr] = SENSORS_LIMIT(TEMP_MAXMIN_TO_REG(val), 0, 255);
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	vt8231_write_value(data, regtempmax[nr], data->temp_max[nr]);
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	mutex_unlock(&data->update_lock);
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	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;
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	struct vt8231_data *data = dev_get_drvdata(dev);
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	int val = simple_strtol(buf, NULL, 10);

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	mutex_lock(&data->update_lock);
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	data->temp_min[nr] = SENSORS_LIMIT(TEMP_MAXMIN_TO_REG(val), 0, 255);
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	vt8231_write_value(data, regtempmin[nr], data->temp_min[nr]);
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	mutex_unlock(&data->update_lock);
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	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);		\
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static SENSOR_DEVICE_ATTR(temp##offset##_max_hyst, S_IRUGO | S_IWUSR,	\
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		show_temp_min, set_temp_min, offset - 1)

static DEVICE_ATTR(temp1_input, S_IRUGO, show_temp0, NULL);
static DEVICE_ATTR(temp1_max, S_IRUGO | S_IWUSR, show_temp0_max, set_temp0_max);
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static DEVICE_ATTR(temp1_max_hyst, S_IRUGO | S_IWUSR, show_temp0_min, set_temp0_min);
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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;
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	struct vt8231_data *data = dev_get_drvdata(dev);
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	int val = simple_strtoul(buf, NULL, 10);

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	mutex_lock(&data->update_lock);
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	data->fan_min[nr] = FAN_TO_REG(val, DIV_FROM_REG(data->fan_div[nr]));
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	vt8231_write_value(data, VT8231_REG_FAN_MIN(nr), data->fan_min[nr]);
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	mutex_unlock(&data->update_lock);
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	return count;
}

static ssize_t set_fan_div(struct device *dev, struct device_attribute *attr,
		const char *buf, size_t count)
{
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	struct vt8231_data *data = dev_get_drvdata(dev);
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	struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
	unsigned long val = simple_strtoul(buf, NULL, 10);
	int nr = sensor_attr->index;
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	int old = vt8231_read_value(data, VT8231_REG_FANDIV);
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	long min = FAN_FROM_REG(data->fan_min[nr],
				 DIV_FROM_REG(data->fan_div[nr]));

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	mutex_lock(&data->update_lock);
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	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:
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		dev_err(dev, "fan_div value %ld not supported."
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		        "Choose one of 1, 2, 4 or 8!\n", val);
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		mutex_unlock(&data->update_lock);
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		return -EINVAL;
	}

	/* Correct the fan minimum speed */
	data->fan_min[nr] = FAN_TO_REG(min, DIV_FROM_REG(data->fan_div[nr]));
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	vt8231_write_value(data, VT8231_REG_FAN_MIN(nr), data->fan_min[nr]);
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	old = (old & 0x0f) | (data->fan_div[1] << 6) | (data->fan_div[0] << 4);
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	vt8231_write_value(data, VT8231_REG_FANDIV, old);
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	mutex_unlock(&data->update_lock);
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	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 show_alarms(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(alarms, S_IRUGO, show_alarms, NULL);

544 545 546 547 548 549 550 551
static ssize_t show_name(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(name, S_IRUGO, show_name, NULL);

552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645
static struct attribute *vt8231_attributes_temps[6][4] = {
	{
		&dev_attr_temp1_input.attr,
		&dev_attr_temp1_max_hyst.attr,
		&dev_attr_temp1_max.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,
		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,
		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,
		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,
		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,
		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][4] = {
	{
		&sensor_dev_attr_in0_input.dev_attr.attr,
		&sensor_dev_attr_in0_min.dev_attr.attr,
		&sensor_dev_attr_in0_max.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,
		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,
		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,
		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,
		NULL
	}, {
		&dev_attr_in5_input.attr,
		&dev_attr_in5_min.attr,
		&dev_attr_in5_max.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,
	&dev_attr_alarms.attr,
646
	&dev_attr_name.attr,
647 648 649 650 651 652 653
	NULL
};

static const struct attribute_group vt8231_group = {
	.attrs = vt8231_attributes,
};

654
static struct platform_driver vt8231_driver = {
655
	.driver = {
656
		.owner	= THIS_MODULE,
657 658
		.name	= "vt8231",
	},
659 660
	.probe	= vt8231_probe,
	.remove	= __devexit_p(vt8231_remove),
661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678
};

static 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 __devinit 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,
};

679
int vt8231_probe(struct platform_device *pdev)
680
{
681
	struct resource *res;
682 683 684 685
	struct vt8231_data *data;
	int err = 0, i;

	/* Reserve the ISA region */
686 687 688 689 690
	res = platform_get_resource(pdev, IORESOURCE_IO, 0);
	if (!request_region(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);
691 692 693 694 695 696 697 698
		return -ENODEV;
	}

	if (!(data = kzalloc(sizeof(struct vt8231_data), GFP_KERNEL))) {
		err = -ENOMEM;
		goto exit_release;
	}

699 700 701
	platform_set_drvdata(pdev, data);
	data->addr = res->start;
	data->name = "vt8231";
702

703
	mutex_init(&data->update_lock);
704
	vt8231_init_device(data);
705 706

	/* Register sysfs hooks */
707 708
	if ((err = sysfs_create_group(&pdev->dev.kobj, &vt8231_group)))
		goto exit_free;
709 710

	/* Must update device information to find out the config field */
711
	data->uch_config = vt8231_read_value(data, VT8231_REG_UCH_CONFIG);
712

713
	for (i = 0; i < ARRAY_SIZE(vt8231_group_temps); i++) {
714
		if (ISTEMP(i, data->uch_config)) {
715
			if ((err = sysfs_create_group(&pdev->dev.kobj,
716 717
					&vt8231_group_temps[i])))
				goto exit_remove_files;
718 719 720
		}
	}

721
	for (i = 0; i < ARRAY_SIZE(vt8231_group_volts); i++) {
722
		if (ISVOLT(i, data->uch_config)) {
723
			if ((err = sysfs_create_group(&pdev->dev.kobj,
724 725
					&vt8231_group_volts[i])))
				goto exit_remove_files;
726 727 728
		}
	}

729
	data->class_dev = hwmon_device_register(&pdev->dev);
730 731 732 733
	if (IS_ERR(data->class_dev)) {
		err = PTR_ERR(data->class_dev);
		goto exit_remove_files;
	}
734 735
	return 0;

736 737
exit_remove_files:
	for (i = 0; i < ARRAY_SIZE(vt8231_group_volts); i++)
738
		sysfs_remove_group(&pdev->dev.kobj, &vt8231_group_volts[i]);
739 740

	for (i = 0; i < ARRAY_SIZE(vt8231_group_temps); i++)
741 742 743
		sysfs_remove_group(&pdev->dev.kobj, &vt8231_group_temps[i]);

	sysfs_remove_group(&pdev->dev.kobj, &vt8231_group);
744

745
exit_free:
746
	platform_set_drvdata(pdev, NULL);
747
	kfree(data);
748

749
exit_release:
750
	release_region(res->start, VT8231_EXTENT);
751 752 753
	return err;
}

754
static int __devexit vt8231_remove(struct platform_device *pdev)
755
{
756 757
	struct vt8231_data *data = platform_get_drvdata(pdev);
	int i;
758 759 760

	hwmon_device_unregister(data->class_dev);

761
	for (i = 0; i < ARRAY_SIZE(vt8231_group_volts); i++)
762
		sysfs_remove_group(&pdev->dev.kobj, &vt8231_group_volts[i]);
763 764

	for (i = 0; i < ARRAY_SIZE(vt8231_group_temps); i++)
765
		sysfs_remove_group(&pdev->dev.kobj, &vt8231_group_temps[i]);
766

767
	sysfs_remove_group(&pdev->dev.kobj, &vt8231_group);
768

769 770
	release_region(data->addr, VT8231_EXTENT);
	platform_set_drvdata(pdev, NULL);
771 772 773 774
	kfree(data);
	return 0;
}

775
static void vt8231_init_device(struct vt8231_data *data)
776
{
777 778
	vt8231_write_value(data, VT8231_REG_TEMP1_CONFIG, 0);
	vt8231_write_value(data, VT8231_REG_TEMP2_CONFIG, 0);
779 780 781 782
}

static struct vt8231_data *vt8231_update_device(struct device *dev)
{
783
	struct vt8231_data *data = dev_get_drvdata(dev);
784 785 786
	int i;
	u16 low;

787
	mutex_lock(&data->update_lock);
788 789 790 791 792

	if (time_after(jiffies, data->last_updated + HZ + HZ / 2)
	    || !data->valid) {
		for (i = 0; i < 6; i++) {
			if (ISVOLT(i, data->uch_config)) {
793
				data->in[i] = vt8231_read_value(data,
794
						regvolt[i]);
795
				data->in_min[i] = vt8231_read_value(data,
796
						regvoltmin[i]);
797
				data->in_max[i] = vt8231_read_value(data,
798 799 800 801
						regvoltmax[i]);
			}
		}
		for (i = 0; i < 2; i++) {
802
			data->fan[i] = vt8231_read_value(data,
803
						VT8231_REG_FAN(i));
804
			data->fan_min[i] = vt8231_read_value(data,
805 806 807
						VT8231_REG_FAN_MIN(i));
		}

808
		low = vt8231_read_value(data, VT8231_REG_TEMP_LOW01);
809
		low = (low >> 6) | ((low & 0x30) >> 2)
810
		    | (vt8231_read_value(data, VT8231_REG_TEMP_LOW25) << 4);
811 812
		for (i = 0; i < 6; i++) {
			if (ISTEMP(i, data->uch_config)) {
813
				data->temp[i] = (vt8231_read_value(data,
814 815
						       regtemp[i]) << 2)
						| ((low >> (2 * i)) & 0x03);
816
				data->temp_max[i] = vt8231_read_value(data,
817
						      regtempmax[i]);
818
				data->temp_min[i] = vt8231_read_value(data,
819 820 821 822
						      regtempmin[i]);
			}
		}

823
		i = vt8231_read_value(data, VT8231_REG_FANDIV);
824 825
		data->fan_div[0] = (i >> 4) & 0x03;
		data->fan_div[1] = i >> 6;
826 827
		data->alarms = vt8231_read_value(data, VT8231_REG_ALARM1) |
			(vt8231_read_value(data, VT8231_REG_ALARM2) << 8);
828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845

		/* 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;
	}

846
	mutex_unlock(&data->update_lock);
847 848 849 850

	return data;
}

851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889
static int __devinit vt8231_device_add(unsigned short address)
{
	struct resource res = {
		.start	= address,
		.end	= address + VT8231_EXTENT - 1,
		.name	= "vt8231",
		.flags	= IORESOURCE_IO,
	};
	int err;

	pdev = platform_device_alloc("vt8231", address);
	if (!pdev) {
		err = -ENOMEM;
		printk(KERN_ERR "vt8231: Device allocation failed\n");
		goto exit;
	}

	err = platform_device_add_resources(pdev, &res, 1);
	if (err) {
		printk(KERN_ERR "vt8231: Device resource addition failed "
		       "(%d)\n", err);
		goto exit_device_put;
	}

	err = platform_device_add(pdev);
	if (err) {
		printk(KERN_ERR "vt8231: Device addition failed (%d)\n",
		       err);
		goto exit_device_put;
	}

	return 0;

exit_device_put:
	platform_device_put(pdev);
exit:
	return err;
}

890 891 892
static int __devinit vt8231_pci_probe(struct pci_dev *dev,
				const struct pci_device_id *id)
{
893 894 895 896 897 898 899 900 901 902
	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;
	}
903 904 905 906 907

	if (PCIBIOS_SUCCESSFUL != pci_read_config_word(dev, VT8231_BASE_REG,
							&val))
		return -ENODEV;

908 909
	address = val & ~(VT8231_EXTENT - 1);
	if (address == 0) {
910 911 912 913 914
		dev_err(&dev->dev, "base address not set -\
				 upgrade BIOS or use force_addr=0xaddr\n");
		return -ENODEV;
	}

915 916 917
	if (PCIBIOS_SUCCESSFUL != pci_read_config_word(dev, VT8231_ENABLE_REG,
							&val))
		return -ENODEV;
918

919 920 921 922 923 924
	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;
925 926
	}

927 928 929 930 931 932 933
	if (platform_driver_register(&vt8231_driver))
		goto exit;

	/* Sets global pdev as a side effect */
	if (vt8231_device_add(address))
		goto exit_unregister;

934 935 936 937
	/* 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.
	 */
938 939 940 941 942 943 944 945 946

	/* 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:
947 948 949 950 951
	return -ENODEV;
}

static int __init sm_vt8231_init(void)
{
952
	return pci_register_driver(&vt8231_pci_driver);
953 954 955 956 957 958
}

static void __exit sm_vt8231_exit(void)
{
	pci_unregister_driver(&vt8231_pci_driver);
	if (s_bridge != NULL) {
959 960
		platform_device_unregister(pdev);
		platform_driver_unregister(&vt8231_driver);
961 962 963 964 965 966 967 968 969 970 971
		pci_dev_put(s_bridge);
		s_bridge = NULL;
	}
}

MODULE_AUTHOR("Roger Lucas <roger@planbit.co.uk>");
MODULE_DESCRIPTION("VT8231 sensors");
MODULE_LICENSE("GPL");

module_init(sm_vt8231_init);
module_exit(sm_vt8231_exit);
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