ASoC: Add WM8728 codec driver

The WM8728 is a high performance stereo DAC designed for applications
such as DVD, home theatre and digital TV.

Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
diff --git a/sound/soc/codecs/wm8728.h b/sound/soc/codecs/wm8728.h
new file mode 100644
index 0000000..d269c13
--- /dev/null
+++ b/sound/soc/codecs/wm8728.h
@@ -0,0 +1,30 @@
+/*
+ * wm8728.h  --  WM8728 ASoC codec driver
+ *
+ * Copyright 2008 Wolfson Microelectronics plc
+ *
+ * Author: Mark Brown <broonie@opensource.wolfsonmicro.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#ifndef _WM8728_H
+#define _WM8728_H
+
+#define WM8728_DACLVOL   0x00
+#define WM8728_DACRVOL   0x01
+#define WM8728_DACCTL    0x02
+#define WM8728_IFCTL     0x03
+
+struct wm8728_setup_data {
+	int            spi;
+	int            i2c_bus;
+	unsigned short i2c_address;
+};
+
+extern struct snd_soc_dai wm8728_dai;
+extern struct snd_soc_codec_device soc_codec_dev_wm8728;
+
+#endif