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>
diff --git a/drivers/hwmon/via-cputemp.c b/drivers/hwmon/via-cputemp.c
index 0d18de4..8eac67d 100644
--- a/drivers/hwmon/via-cputemp.c
+++ b/drivers/hwmon/via-cputemp.c
@@ -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 @@
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 @@
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 @@
.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 @@
/* 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 @@
}
/* 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 @@
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 @@
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 @@
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);
