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hwmon: (i5500_temp) Don't bind to disabled sensors 

On many motherboards, for an unknown reason, the thermal sensor seems
to be disabled and will return a constant temperature value of 36.5
degrees Celsius. Don't bind to the device in that case, so that we
don't report this bogus value to userspace.

Signed-off-by: Jean Delvare <jdelvare@suse.de>
Cc: Romain Dolbeau <romain@dolbeau.org>
Reviewed-by: Guenter Roeck <linux@roeck-us.net>
This commit is contained in:
Jean Delvare 2015-01-24 14:16:21 +01:00
parent b8d48ce951
commit e3d982034d
1 changed files with 9 additions and 0 deletions
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9
drivers/hwmon/i5500_temp.c
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@ -121,6 +121,8 @@ static int i5500_temp_probe(struct pci_dev *pdev,
{
int err;
struct device *hwmon_dev;
u32 tstimer;
s8 tsfsc;
err = pci_enable_device(pdev);
if (err) {
@ -128,6 +130,13 @@ static int i5500_temp_probe(struct pci_dev *pdev,
return err;
}
pci_read_config_byte(pdev, REG_TSFSC, &tsfsc);
pci_read_config_dword(pdev, REG_TSTIMER, &tstimer);
if (tsfsc == 0x7F && tstimer == 0x07D30D40) {
dev_warn(&pdev->dev, "Sensor seems to be disabled\n");
return -ENODEV;
}
hwmon_dev = devm_hwmon_device_register_with_groups(&pdev->dev,
"intel5500", NULL,
i5500_temp_groups);