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platform/x86: dell-ddv: Fix temperature scaling

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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: a77272c160 ("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>
This commit is contained in:
Armin Wolf 2023-02-18 12:53:18 +01:00 committed by Hans de Goede
parent 001f61c468
commit 0331b1b0ba
1 changed files with 2 additions and 2 deletions
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4
drivers/platform/x86/dell/dell-wmi-ddv.c
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@ -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)