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>
diff --git a/drivers/hwmon/i5500_temp.c b/drivers/hwmon/i5500_temp.c
index fdcfa9f..fb84a0e 100644
--- a/drivers/hwmon/i5500_temp.c
+++ b/drivers/hwmon/i5500_temp.c
@@ -121,6 +121,8 @@
{
int err;
struct device *hwmon_dev;
+ u32 tstimer;
+ s8 tsfsc;
err = pci_enable_device(pdev);
if (err) {
@@ -128,6 +130,13 @@
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);