From 39fc181e558ca11a2d36590bef25ba6f163046ec Mon Sep 17 00:00:00 2001
From: Stefan Ott <stefan@ott.net>
Date: Wed, 22 Apr 2020 23:20:03 +0200
Subject: mb/lenovo/t420s: Add support for ThinkLight

With this patch, the ThinkLight on the ThinkPad T420S can be controlled
through the OS.  The same change was done for the ThinkPad X200 in
b45912f4: mb/lenovo/x200: Add support for ThinkLight

After applying this patch, the light can be controlled like this:

    echo on >/proc/acpi/ibm/light
    echo off >/proc/acpi/ibm/light

Or through sysfs at /sys/class/leds/tpacpi::thinklight

Unfortunately I do not own a T420S to test this.

Change-Id: I245acf81b34abccf7bcb04126275ab8b154135d5
Signed-off-by: Stefan Ott <stefan@ott.net>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/40715
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Alexander Couzens <lynxis@fe80.eu>
---
 src/mainboard/lenovo/t420s/dsdt.asl | 1 +
 1 file changed, 1 insertion(+)

diff --git a/src/mainboard/lenovo/t420s/dsdt.asl b/src/mainboard/lenovo/t420s/dsdt.asl
index f0964d3561..b83fe38daa 100644
--- a/src/mainboard/lenovo/t420s/dsdt.asl
+++ b/src/mainboard/lenovo/t420s/dsdt.asl
@@ -35,4 +35,5 @@ DefinitionBlock(
 	}
 
 	#include <southbridge/intel/common/acpi/sleepstates.asl>
+	#include <ec/lenovo/h8/acpi/thinklight.asl>
 }
-- 
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