From: Riwen Lu luriwen@kylinos.cn
[ Upstream commit 78d13552346289bad4a9bf8eabb5eec5e5a321a5 ]
The scpi hwmon shows the sub-zero temperature in an unsigned integer, which would confuse the users when the machine works in low temperature environment. This shows the sub-zero temperature in an signed value and users can get it properly from sensors.
Signed-off-by: Riwen Lu luriwen@kylinos.cn Tested-by: Xin Chen chenxin@kylinos.cn Link: https://lore.kernel.org/r/20210604030959.736379-1-luriwen@kylinos.cn Signed-off-by: Guenter Roeck linux@roeck-us.net Signed-off-by: Sasha Levin sashal@kernel.org Signed-off-by: Yang Yingliang yangyingliang@huawei.com --- drivers/hwmon/scpi-hwmon.c | 9 +++++++++ 1 file changed, 9 insertions(+)
diff --git a/drivers/hwmon/scpi-hwmon.c b/drivers/hwmon/scpi-hwmon.c index 7e49da50bc69b..562f3e287297a 100644 --- a/drivers/hwmon/scpi-hwmon.c +++ b/drivers/hwmon/scpi-hwmon.c @@ -107,6 +107,15 @@ scpi_show_sensor(struct device *dev, struct device_attribute *attr, char *buf)
scpi_scale_reading(&value, sensor);
+ /* + * Temperature sensor values are treated as signed values based on + * observation even though that is not explicitly specified, and + * because an unsigned u64 temperature does not really make practical + * sense especially when the temperature is below zero degrees Celsius. + */ + if (sensor->info.class == TEMPERATURE) + return sprintf(buf, "%lld\n", (s64)value); + return sprintf(buf, "%llu\n", value); }