linux-kernel - [PATCH] backlight: ams369fg06: make power

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Message-id: <002b01ce10e7$2d7364b0$885a2e10$%han@samsung.com>
Date:	Fri, 22 Feb 2013 19:27:12 +0900
From:	Jingoo Han <jg1.han@...sung.com>
To:	'Andrew Morton' <akpm@...ux-foundation.org>
Cc:	'LKML' <linux-kernel@...r.kernel.org>,
	'Richard Purdie' <rpurdie@...ys.net>,
	'Jingoo Han' <jg1.han@...sung.com>
Subject: [PATCH] backlight: ams369fg06: make power_on() call optional

This patch makes power_on() call optional. The voltage source can
be provided to some boards using ams369fg06 panel, thus in this
case, power on/off sequence is not necessary.

Signed-off-by: Jingoo Han <jg1.han@...sung.com>
---
 drivers/video/backlight/ams369fg06.c |    8 +++-----
 1 files changed, 3 insertions(+), 5 deletions(-)

diff --git a/drivers/video/backlight/ams369fg06.c b/drivers/video/backlight/ams369fg06.c
index d29e494..c02aa2c 100644
--- a/drivers/video/backlight/ams369fg06.c
+++ b/drivers/video/backlight/ams369fg06.c
@@ -317,10 +317,7 @@ static int ams369fg06_power_on(struct ams369fg06 *lcd)
 	pd = lcd->lcd_pd;
 	bd = lcd->bd;
 
-	if (!pd->power_on) {
-		dev_err(lcd->dev, "power_on is NULL.\n");
-		return -EINVAL;
-	} else {
+	if (pd->power_on) {
 		pd->power_on(lcd->ld, 1);
 		msleep(pd->power_on_delay);
 	}
@@ -370,7 +367,8 @@ static int ams369fg06_power_off(struct ams369fg06 *lcd)
 
 	msleep(pd->power_off_delay);
 
-	pd->power_on(lcd->ld, 0);
+	if (pd->power_on)
+		pd->power_on(lcd->ld, 0);
 
 	return 0;
 }
-- 
1.7.2.5


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