From 6432941f10d0ed76a4f944b7c8c4e8b2f6ecfe70 Mon Sep 17 00:00:00 2001
From: Dave Chapman <dave@dchapman.com>
Date: Fri, 17 Jul 2009 22:40:36 +0000
Subject: [PATCH] Basic backlight driver for Nano 2G

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@21935 a1c6a512-1295-4272-9138-f99709370657
---
 firmware/SOURCES                              |  1 +
 .../arm/s5l8700/ipodnano2g/backlight-nano2g.c | 67 +++++++++++++++++++
 2 files changed, 68 insertions(+)
 create mode 100644 firmware/target/arm/s5l8700/ipodnano2g/backlight-nano2g.c

diff --git a/firmware/SOURCES b/firmware/SOURCES
index add88848dc..a3359cf8e7 100644
--- a/firmware/SOURCES
+++ b/firmware/SOURCES
@@ -1302,6 +1302,7 @@ target/arm/s5l8700/udacodec-meizu.c
 
 #ifdef IPOD_NANO2G
 target/arm/s5l8700/kernel-s5l8700.c
+target/arm/s5l8700/ipodnano2g/backlight-nano2g.c
 target/arm/s5l8700/ipodnano2g/lcd-nano2g.c
 #endif
 
diff --git a/firmware/target/arm/s5l8700/ipodnano2g/backlight-nano2g.c b/firmware/target/arm/s5l8700/ipodnano2g/backlight-nano2g.c
new file mode 100644
index 0000000000..8a2e0d41a8
--- /dev/null
+++ b/firmware/target/arm/s5l8700/ipodnano2g/backlight-nano2g.c
@@ -0,0 +1,67 @@
+/***************************************************************************
+ *             __________               __   ___.
+ *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
+ *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
+ *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
+ *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
+ *                     \/            \/     \/    \/            \/
+ * $Id$
+ *
+ * Copyright (C) 2009 by Dave Chapman
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
+ * KIND, either express or implied.
+ *
+ ****************************************************************************/
+#include <stdbool.h>
+
+#include "config.h"
+#include "backlight.h"
+#include "backlight-target.h"
+#include "i2c-s5l8700.h"
+
+
+static unsigned char bl_i2c_readbyte(int address)
+{
+    unsigned char tmp;
+
+    i2c_read(0xe6, address, 1, &tmp);
+
+    return tmp;
+}
+
+static void bl_i2c_writebyte(int address, unsigned char val)
+{
+    i2c_write(0xe6, address, 1, &val);
+}
+
+void _backlight_set_brightness(int brightness)
+{
+    (void)brightness;
+}
+
+void _backlight_on(void)
+{
+    bl_i2c_writebyte(0x2b,10);
+    bl_i2c_writebyte(0x2a,6);
+    bl_i2c_writebyte(0x28,0x2e);
+    bl_i2c_writebyte(0x29,(bl_i2c_readbyte(0x29)&0xf0)|1);
+    bl_i2c_writebyte(0x2a,7);
+}
+
+void _backlight_off(void)
+{
+    bl_i2c_writebyte(0x2b,10);
+    bl_i2c_writebyte(0x29,bl_i2c_readbyte(0x29)&0xf0);
+    bl_i2c_writebyte(0x2a,7);
+}
+
+bool _backlight_init(void)
+{
+    _backlight_on();
+}