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@xxxxxxx>
Cc: Romain Dolbeau <romain@xxxxxxxxxxx>
Reviewed-by: Guenter Roeck <linux@xxxxxxxxxxxx>
---
Changes since v1:
* Also check the value of register TSTIMER, to improve the reliability
of the heuristic.
drivers/hwmon/i5500_temp.c | 9 +++++++++
1 file changed, 9 insertions(+)
--- linux-3.17.orig/drivers/hwmon/i5500_temp.c 2014-10-23 11:21:54.204198524 +0200
+++ linux-3.17/drivers/hwmon/i5500_temp.c 2014-10-23 11:31:20.376347502 +0200
@@ -121,6 +121,8 @@ static int i5500_temp_probe(struct pci_d
{
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_d
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);
--
Jean Delvare
SUSE L3 Support
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