From 8d7183a904e0d0a9fe271014db4cde642cf15e04 Mon Sep 17 00:00:00 2001
From: Matt DeVillier <matt.devillier@gmail.com>
Date: Sun, 19 Oct 2025 17:33:46 -0500
Subject: [PATCH] ec/google/chromeec: Add option to set keyboard backlight
 level at boot

Add the ability to set the keyboard backlight level at boot, controlled
by a setup option variable and restricted to devices which actually
have a backlit keyboard.

TEST=tested hooked up to a CFR option 'ec_kb_backlight' (added later in
the patch series) to set the keyboard backlight at boot, with
visibility controlled by backlight presence, on a range of Chromebooks
with and without keyboard backlight support.

Change-Id: I92eed62935d0333f548599860b7bbe22f6b9f2b4
Signed-off-by: Matt DeVillier <matt.devillier@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/89828
Reviewed-by: Caveh Jalali <caveh@chromium.org>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Paul Menzel <paulepanter@mailbox.org>
---
 src/ec/google/chromeec/ec.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/src/ec/google/chromeec/ec.c b/src/ec/google/chromeec/ec.c
index fb8a014d0a..66cf54c4b0 100644
--- a/src/ec/google/chromeec/ec.c
+++ b/src/ec/google/chromeec/ec.c
@@ -3,6 +3,7 @@
 #include <stdbool.h>
 #include <stdint.h>
 #include <string.h>
+#include <acpi/acpi.h>
 #include <assert.h>
 #include <console/console.h>
 #include <delay.h>
@@ -10,6 +11,7 @@
 #include <device/path.h>
 #include <elog.h>
 #include <halt.h>
+#include <option.h>
 #include <reset.h>
 #include <rtc.h>
 #include <security/vboot/vboot_common.h>
@@ -1329,6 +1331,11 @@ void google_chromeec_init(void)
 	if (CONFIG(EC_GOOGLE_CHROMEEC_AUTO_FAN_CTRL)) {
 		ec_cmd_thermal_auto_fan_ctrl(PLAT_EC);
 	}
+
+	/* Set keyboard backlight */
+	int backlight_level = get_uint_option("ec_kb_backlight", -1);
+	if (backlight_level != -1 && !acpi_is_wakeup_s3() && google_chromeec_has_kbbacklight())
+		google_chromeec_kbbacklight(backlight_level);
 }
 
 int google_ec_running_ro(void)