From 0331b1b0ba65376ecf1c69414aa7696fef0930cb Mon Sep 17 00:00:00 2001 From: Armin Wolf Date: Sat, 18 Feb 2023 12:53:18 +0100 Subject: [PATCH] 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 Link: https://lore.kernel.org/r/20230218115318.20662-2-W_Armin@gmx.de Signed-off-by: Hans de Goede Reviewed-by: Hans de Goede --- drivers/platform/x86/dell/dell-wmi-ddv.c | 4 ++-- 1 file 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 eff4e96..2750dee 100644 --- a/drivers/platform/x86/dell/dell-wmi-ddv.c +++ b/drivers/platform/x86/dell/dell-wmi-ddv.c @@ -17,7 +17,6 @@ #include #include #include -#include #include #include #include @@ -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) -- 2.7.4