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authorRiwen Lu <luriwen@kylinos.cn>2021-06-04 11:09:59 +0800
committerGuenter Roeck <linux@roeck-us.net>2021-06-09 11:51:30 -0700
commit78d13552346289bad4a9bf8eabb5eec5e5a321a5 (patch)
treeea796e8b5df1f514e144784e9820bc9d26f8111b /drivers/hwmon
parent7656cd2177612aa7c299b083ecff30a4d3e9a587 (diff)
hwmon: (scpi-hwmon) shows the negative temperature properly
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>
Diffstat (limited to 'drivers/hwmon')
-rw-r--r--drivers/hwmon/scpi-hwmon.c9
1 files changed, 9 insertions, 0 deletions
diff --git a/drivers/hwmon/scpi-hwmon.c b/drivers/hwmon/scpi-hwmon.c
index 25aac40f2764..919877970ae3 100644
--- a/drivers/hwmon/scpi-hwmon.c
+++ b/drivers/hwmon/scpi-hwmon.c
@@ -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);
}