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hwmon: (scpi-hwmon) shows the negative temperature properly

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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>
This commit is contained in:
Riwen Lu 2021-06-04 11:09:59 +08:00 committed by Guenter Roeck
parent 7656cd2177
commit 78d1355234
1 changed files with 9 additions and 0 deletions
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9
drivers/hwmon/scpi-hwmon.c
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@ -99,6 +99,15 @@ 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);
}