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platform/x86: dell-ddv: Fix temperature calculation

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[ Upstream commit 7a248294a3 ]

On the Dell Inspiron 3505 the battery temperature is always
0.1 degrees larger than the temperature show inside the OEM
application.

Emulate this behaviour to avoid showing strange looking values
like 29.1 degrees.

Fixes: 0331b1b0ba ("platform/x86: dell-ddv: Fix temperature scaling")
Signed-off-by: Armin Wolf <W_Armin@gmx.de>
Reviewed-by: Sebastian Reichel <sebastian.reichel@collabora.com>
Link: https://lore.kernel.org/r/20250305053009.378609-2-W_Armin@gmx.de
Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Armin Wolf
2025-03-05 06:30:07 +01:00
committed by Greg Kroah-Hartman
parent 0654ea1397
commit 5b67393415
1 changed files with 4 additions and 2 deletions
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drivers/platform/x86/dell/dell-wmi-ddv.c
+4 -2
View File
@@ -665,8 +665,10 @@ static ssize_t temp_show(struct device *dev, struct device_attribute *attr, char
if (ret < 0)
return ret;
/* Use 2731 instead of 2731.5 to avoid unnecessary rounding */
return sysfs_emit(buf, "%d\n", value - 2731);
/* Use 2732 instead of 2731.5 to avoid unnecessary rounding and to emulate
* the behaviour of the OEM application which seems to round down the result.
*/
return sysfs_emit(buf, "%d\n", value - 2732);
}
static ssize_t eppid_show(struct device *dev, struct device_attribute *attr, char *buf)