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hwmon: (via-cputemp) Add VID reporting support 

At least VIA family 6 model D CPU report the VID settings in a MSR,
so expose the value to user-space. Not sure about model A.

Signed-off-by: Jean Delvare <khali@linux-fr.org>
Acked-by: Guenter Roeck <guenter.roeck@ericsson.com>
Tested-by: Jeff Rickman <jrickman@myamigos.us>
This commit is contained in:
Jean Delvare 2011-07-25 21:46:10 +02:00 committed by Jean Delvare
parent 0a88f4b557
commit 764e043bb4
2 changed files with 40 additions and 5 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
drivers/hwmon/Kconfig
View File

@ -1162,6 +1162,7 @@ config SENSORS_TWL4030_MADC
config SENSORS_VIA_CPUTEMP
tristate "VIA CPU temperature sensor"
depends on X86
select HWMON_VID
help
If you say yes here you get support for the temperature
sensor inside your CPU. Supported are all known variants of

44
drivers/hwmon/via-cputemp.c
View File

@ -27,6 +27,7 @@
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/hwmon.h>
#include <linux/hwmon-vid.h>
#include <linux/sysfs.h>
#include <linux/hwmon-sysfs.h>
#include <linux/err.h>
@ -48,8 +49,10 @@ enum { SHOW_TEMP, SHOW_LABEL, SHOW_NAME };
struct via_cputemp_data {
struct device *hwmon_dev;
const char *name;
u8 vrm;
u32 id;
u32 msr;
u32 msr_temp;
u32 msr_vid;
};
/*
@ -77,13 +80,27 @@ static ssize_t show_temp(struct device *dev,
u32 eax, edx;
int err;
err = rdmsr_safe_on_cpu(data->id, data->msr, &eax, &edx);
err = rdmsr_safe_on_cpu(data->id, data->msr_temp, &eax, &edx);
if (err)
return -EAGAIN;
return sprintf(buf, "%lu\n", ((unsigned long)eax & 0xffffff) * 1000);
}
static ssize_t show_cpu_vid(struct device *dev,
struct device_attribute *devattr, char *buf)
{
struct via_cputemp_data *data = dev_get_drvdata(dev);
u32 eax, edx;
int err;
err = rdmsr_safe_on_cpu(data->id, data->msr_vid, &eax, &edx);
if (err)
return -EAGAIN;
return sprintf(buf, "%d\n", vid_from_reg(~edx & 0x7f, data->vrm));
}
static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, show_temp, NULL,
SHOW_TEMP);
static SENSOR_DEVICE_ATTR(temp1_label, S_IRUGO, show_name, NULL, SHOW_LABEL);
@ -100,6 +117,9 @@ static const struct attribute_group via_cputemp_group = {
.attrs = via_cputemp_attributes,
};
/* Optional attributes */
static DEVICE_ATTR(cpu0_vid, S_IRUGO, show_cpu_vid, NULL);
static int __devinit via_cputemp_probe(struct platform_device *pdev)
{
struct via_cputemp_data *data;
@ -122,11 +142,12 @@ static int __devinit via_cputemp_probe(struct platform_device *pdev)
/* C7 A */
case 0xD:
/* C7 D */
data->msr = 0x1169;
data->msr_temp = 0x1169;
data->msr_vid = 0x198;
break;
case 0xF:
/* Nano */
data->msr = 0x1423;
data->msr_temp = 0x1423;
break;
default:
err = -ENODEV;
@ -134,7 +155,7 @@ static int __devinit via_cputemp_probe(struct platform_device *pdev)
}
/* test if we can access the TEMPERATURE MSR */
err = rdmsr_safe_on_cpu(data->id, data->msr, &eax, &edx);
err = rdmsr_safe_on_cpu(data->id, data->msr_temp, &eax, &edx);
if (err) {
dev_err(&pdev->dev,
"Unable to access TEMPERATURE MSR, giving up\n");
@ -147,6 +168,15 @@ static int __devinit via_cputemp_probe(struct platform_device *pdev)
if (err)
goto exit_free;
if (data->msr_vid)
data->vrm = vid_which_vrm();
if (data->vrm) {
err = device_create_file(&pdev->dev, &dev_attr_cpu0_vid);
if (err)
goto exit_remove;
}
data->hwmon_dev = hwmon_device_register(&pdev->dev);
if (IS_ERR(data->hwmon_dev)) {
err = PTR_ERR(data->hwmon_dev);
@ -158,6 +188,8 @@ static int __devinit via_cputemp_probe(struct platform_device *pdev)
return 0;
exit_remove:
if (data->vrm)
device_remove_file(&pdev->dev, &dev_attr_cpu0_vid);
sysfs_remove_group(&pdev->dev.kobj, &via_cputemp_group);
exit_free:
platform_set_drvdata(pdev, NULL);
@ -171,6 +203,8 @@ static int __devexit via_cputemp_remove(struct platform_device *pdev)
struct via_cputemp_data *data = platform_get_drvdata(pdev);
hwmon_device_unregister(data->hwmon_dev);
if (data->vrm)
device_remove_file(&pdev->dev, &dev_attr_cpu0_vid);
sysfs_remove_group(&pdev->dev.kobj, &via_cputemp_group);
platform_set_drvdata(pdev, NULL);
kfree(data);