linux-kernel - [PATCH v2 4/4] platform: arm64: thinkpad-t14s-ec: add suspend handler for keyboard backlight

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Message-Id: <20251119-thinkpad-t14s-ec-improvements-v2-4-441219857c02@kernel.org>
Date: Wed, 19 Nov 2025 01:41:43 +0100
From: Sebastian Reichel <sre@...nel.org>
To: Sebastian Reichel <sre@...nel.org>, Hans de Goede <hansg@...nel.org>, 
 Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>, 
 Bryan O'Donoghue <bryan.odonoghue@...aro.org>
Cc: platform-driver-x86@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH v2 4/4] platform: arm64: thinkpad-t14s-ec: add suspend
 handler for keyboard backlight

This ensures that the keyboard backlight state is restored after
a suspend-resume cycle. Otherwise the keyboard is automatically
disabled during suspend and then stays disabled after resume.

Note, that this adopts the same behavior as the existing Thinkpad
ACPI driver.

Signed-off-by: Sebastian Reichel <sre@...nel.org>
---
 drivers/platform/arm64/lenovo-thinkpad-t14s.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/platform/arm64/lenovo-thinkpad-t14s.c b/drivers/platform/arm64/lenovo-thinkpad-t14s.c
index cf8eff50d710..5590302a5694 100644
--- a/drivers/platform/arm64/lenovo-thinkpad-t14s.c
+++ b/drivers/platform/arm64/lenovo-thinkpad-t14s.c
@@ -610,6 +610,8 @@ static int t14s_ec_suspend(struct device *dev)
 {
 	struct t14s_ec *ec = dev_get_drvdata(dev);
 
+	led_classdev_suspend(&ec->kbd_backlight);
+
 	t14s_ec_write_sequence(ec, T14S_EC_REG_MODERN_STANDBY,
 			       T14S_EC_MODERN_STANDBY_ENTRY, 3);
 
@@ -623,6 +625,8 @@ static int t14s_ec_resume(struct device *dev)
 	t14s_ec_write_sequence(ec, T14S_EC_REG_MODERN_STANDBY,
 			       T14S_EC_MODERN_STANDBY_EXIT, 3);
 
+	led_classdev_resume(&ec->kbd_backlight);
+
 	return 0;
 }
 

-- 
2.51.0