[ALSA] ASoC codecs: WM8731 support

This patch adds ASoC support for the WM8731 codec.
Supported features:-
 o Capture/Playback/Sidetone/Bypass.
 o 16 & 24 bit audio.
 o 8k - 96k sample rates.
 o DAPM.
Signed-off-by: Richard Purdie <rpurdie@rpsys.net>
Signed-off-by: Liam Girdwood <liam.girdwood@wolfsonmicro.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Jaroslav Kysela <perex@suse.cz>

include/linux/i2c-id.h

@@ -115,6 +115,7 @@
 #define I2C_DRIVERID_KS0127	86	/* Samsung ks0127 video decoder */
 #define I2C_DRIVERID_TLV320AIC23B 87	/* TI TLV320AIC23B audio codec  */
 #define I2C_DRIVERID_ISL1208	88	/* Intersil ISL1208 RTC		*/
+#define I2C_DRIVERID_WM8731		89	/* Wolfson WM8731 audio codec */
 
 #define I2C_DRIVERID_I2CDEV	900
 #define I2C_DRIVERID_ARP        902    /* SMBus ARP Client              */

sound/soc/codecs/wm8731.h

+/*
+ * wm8731.h  --  WM8731 Soc Audio driver
+ *
+ * Copyright 2005 Openedhand Ltd.
+ *
+ * Author: Richard Purdie <richard@openedhand.com>
+ *
+ * Based on wm8753.h
+ *
+ * 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 _WM8731_H
+#define _WM8731_H
+
+/* WM8731 register space */
+
+#define WM8731_LINVOL   0x00
+#define WM8731_RINVOL   0x01
+#define WM8731_LOUT1V   0x02
+#define WM8731_ROUT1V   0x03
+#define WM8731_APANA    0x04
+#define WM8731_APDIGI   0x05
+#define WM8731_PWR      0x06
+#define WM8731_IFACE    0x07
+#define WM8731_SRATE    0x08
+#define WM8731_ACTIVE   0x09
+#define WM8731_RESET	0x0f
+
+#define WM8731_CACHEREGNUM 	10
+
+struct wm8731_setup_data {
+	unsigned short i2c_address;
+};
+
+extern struct snd_soc_codec_dai wm8731_dai;
+extern struct snd_soc_codec_device soc_codec_dev_wm8731;
+
+#endif