diff options
| author | Armin Wolf <W_Armin@gmx.de> | 2023-02-18 12:53:18 +0100 |
|---|---|---|
| committer | Hans de Goede <hdegoede@redhat.com> | 2023-03-07 11:37:27 +0100 |
| commit | 0331b1b0ba65376ecf1c69414aa7696fef0930cb (patch) | |
| tree | 4b18e7cc6f62c66a1985488b374dc6c1fc1f12b9 /drivers | |
| parent | 001f61c4688f1dad18cfaa35ae364b35fb3cd66c (diff) | |
platform/x86: dell-ddv: Fix temperature scaling
After using the built-in UEFI hardware diagnostics to compare
the measured battery temperature, i noticed that the temperature
is actually expressed in tenth degree kelvin, similar to the
SBS-Data standard. For example, a value of 2992 is displayed as
26 degrees celsius.
Fix the scaling so that the correct values are being displayed.
Tested on a Dell Inspiron 3505.
Fixes: a77272c16041 ("platform/x86: dell: Add new dell-wmi-ddv driver")
Signed-off-by: Armin Wolf <W_Armin@gmx.de>
Link: https://lore.kernel.org/r/20230218115318.20662-2-W_Armin@gmx.de
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Reviewed-by: Hans de Goede <hdegoede@redhat.com>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/platform/x86/dell/dell-wmi-ddv.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/drivers/platform/x86/dell/dell-wmi-ddv.c b/drivers/platform/x86/dell/dell-wmi-ddv.c index eff4e9649faf..2750dee99c3e 100644 --- a/drivers/platform/x86/dell/dell-wmi-ddv.c +++ b/drivers/platform/x86/dell/dell-wmi-ddv.c @@ -17,7 +17,6 @@ #include <linux/kernel.h> #include <linux/hwmon.h> #include <linux/kstrtox.h> -#include <linux/math.h> #include <linux/math64.h> #include <linux/module.h> #include <linux/mutex.h> @@ -665,7 +664,8 @@ static ssize_t temp_show(struct device *dev, struct device_attribute *attr, char if (ret < 0) return ret; - return sysfs_emit(buf, "%d\n", DIV_ROUND_CLOSEST(value, 10)); + /* Use 2731 instead of 2731.5 to avoid unnecessary rounding */ + return sysfs_emit(buf, "%d\n", value - 2731); } static ssize_t eppid_show(struct device *dev, struct device_attribute *attr, char *buf) |