linux-kernel - [PATCH] samsung-laptop: Set keyboard backlight initially

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Message-Id: <1356283278-5046-1-git-send-email-stigge@antcom.de>
Date:	Sun, 23 Dec 2012 18:21:18 +0100
From:	Roland Stigge <stigge@...com.de>
To:	gregkh@...uxfoundation.org, corentin.chary@...il.com,
	mjg@...hat.com, platform-driver-x86@...r.kernel.org,
	linux-kernel@...r.kernel.org
Cc:	Roland Stigge <stigge@...com.de>
Subject: [PATCH] samsung-laptop: Set keyboard backlight initially

After boot, /sys/devices/platform/samsung/leds/samsung::kbd_backlight/brightness
shows the maximum value (8) by readout, but the led is off. I need to manually
set it to the respective value to have keyboard backlight.

Fixing via readout-write in samsung_leds_init().

Tested on Samsung NP900X3C.

Signed-off-by: Roland Stigge <stigge@...com.de>
--

I'm encountering a similar issue after suspend/resume (led is off). Still
wondering if and by which technique I should add a respective .resume() because
the driver currently doesn't have pm support and also doesn't register as a
driver. Any hint appreciated.

Thanks in advance!

diff --git a/drivers/platform/x86/samsung-laptop.c b/drivers/platform/x86/samsung-laptop.c
index dd90d15..1d3292c 100644
--- a/drivers/platform/x86/samsung-laptop.c
+++ b/drivers/platform/x86/samsung-laptop.c
@@ -1053,6 +1053,7 @@ static int __init samsung_leds_init(struct samsung_laptop *samsung)

 		ret = led_classdev_register(&samsung->platform_device->dev,
 					   &samsung->kbd_led);
+		kbd_led_set(&samsung->kbd_led, kbd_led_get(&samsung->kbd_led));
 	}

 	if (ret)
--
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