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From: Armin Wolf <W_Armin@gmx.de>
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Jiri Slaby |
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Date: Sat, 18 Feb 2023 12:53:18 +0100
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Subject: [PATCH] platform/x86: dell-ddv: Fix temperature scaling
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References: bsc#1012628
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Patch-mainline: 6.2.7
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Git-commit: 0331b1b0ba65376ecf1c69414aa7696fef0930cb
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[ Upstream commit 0331b1b0ba65376ecf1c69414aa7696fef0930cb ]
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After using the built-in UEFI hardware diagnostics to compare
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the measured battery temperature, i noticed that the temperature
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is actually expressed in tenth degree kelvin, similar to the
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SBS-Data standard. For example, a value of 2992 is displayed as
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26 degrees celsius.
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Fix the scaling so that the correct values are being displayed.
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Tested on a Dell Inspiron 3505.
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Fixes: a77272c16041 ("platform/x86: dell: Add new dell-wmi-ddv driver")
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Signed-off-by: Armin Wolf <W_Armin@gmx.de>
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Link: https://lore.kernel.org/r/20230218115318.20662-2-W_Armin@gmx.de
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Signed-off-by: Hans de Goede <hdegoede@redhat.com>
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Reviewed-by: Hans de Goede <hdegoede@redhat.com>
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Signed-off-by: Sasha Levin <sashal@kernel.org>
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Signed-off-by: Jiri Slaby <jslaby@suse.cz>
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---
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drivers/platform/x86/dell/dell-wmi-ddv.c | 4 ++--
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1 file changed, 2 insertions(+), 2 deletions(-)
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diff --git a/drivers/platform/x86/dell/dell-wmi-ddv.c b/drivers/platform/x86/dell/dell-wmi-ddv.c
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index f99c4cb6..96fede24 100644
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--- a/drivers/platform/x86/dell/dell-wmi-ddv.c
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+++ b/drivers/platform/x86/dell/dell-wmi-ddv.c
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@@ -14,7 +14,6 @@
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#include <linux/errno.h>
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#include <linux/kernel.h>
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#include <linux/kstrtox.h>
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-#include <linux/math.h>
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#include <linux/module.h>
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#include <linux/limits.h>
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#include <linux/power_supply.h>
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@@ -192,7 +191,8 @@ static ssize_t temp_show(struct device *dev, struct device_attribute *attr, char
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if (ret < 0)
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return ret;
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- return sysfs_emit(buf, "%d\n", DIV_ROUND_CLOSEST(value, 10));
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+ /* Use 2731 instead of 2731.5 to avoid unnecessary rounding */
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+ return sysfs_emit(buf, "%d\n", value - 2731);
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}
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static ssize_t eppid_show(struct device *dev, struct device_attribute *attr, char *buf)
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--
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2.35.3
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