linux-kernel - [PATCH V2 1/2] gmux: Add generic write32 function

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Date:	Mon, 13 Aug 2012 18:52:48 -0400
From:	Matthew Garrett <mjg@...hat.com>
To:	linux-kernel@...r.kernel.org
Cc:	platform-driver-x86@...r.kernel.org,
	Matthew Garrett <mjg@...hat.com>,
	Seth Forshee <seth.forshee@...onical.com>
Subject: [PATCH V2 1/2] gmux: Add generic write32 function

Move the special-cased backlight update function to a generic gmux_write32
function.

Signed-off-by: Matthew Garrett <mjg@...hat.com>
Cc: Seth Forshee <seth.forshee@...onical.com>
---

Fixed the typo and irrelevant hunk

 drivers/platform/x86/apple-gmux.c | 23 +++++++++++++----------
 1 file changed, 13 insertions(+), 10 deletions(-)

diff --git a/drivers/platform/x86/apple-gmux.c b/drivers/platform/x86/apple-gmux.c
index 905fa01..c9db5072 100644
--- a/drivers/platform/x86/apple-gmux.c
+++ b/drivers/platform/x86/apple-gmux.c
@@ -75,6 +75,18 @@ static inline u32 gmux_read32(struct apple_gmux_data *gmux_data, int port)
 	return inl(gmux_data->iostart + port);
 }
 
+static inline u32 gmux_write32(struct apple_gmux_data *gmux_data, int port,
+			       u32 val)
+{
+	int i;
+	u8 tmpval;
+
+	for (i = 0; i < 4; i++) {
+		tmpval = (val >> (i * 8)) & 0xff;
+		outb(tmpval, port + i);
+	}
+}
+
 static int gmux_get_brightness(struct backlight_device *bd)
 {
 	struct apple_gmux_data *gmux_data = bl_get_data(bd);
@@ -90,16 +102,7 @@ static int gmux_update_status(struct backlight_device *bd)
 	if (bd->props.state & BL_CORE_SUSPENDED)
 		return 0;
 
-	/*
-	 * Older gmux versions require writing out lower bytes first then
-	 * setting the upper byte to 0 to flush the values. Newer versions
-	 * accept a single u32 write, but the old method also works, so we
-	 * just use the old method for all gmux versions.
-	 */
-	gmux_write8(gmux_data, GMUX_PORT_BRIGHTNESS, brightness);
-	gmux_write8(gmux_data, GMUX_PORT_BRIGHTNESS + 1, brightness >> 8);
-	gmux_write8(gmux_data, GMUX_PORT_BRIGHTNESS + 2, brightness >> 16);
-	gmux_write8(gmux_data, GMUX_PORT_BRIGHTNESS + 3, 0);
+	gmux_write32(gmux_data, GMUX_PORT_BRIGHTNESS, brightness);
 
 	return 0;
 }
-- 
1.7.11.2

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