[ALSA] Adds AC'97 support to Aureon cards.

ICE1712 driver
This patch adds support of the STAC9744 chip located on Aureon cards,
enabling volume control for analogue input channels.
It also adds the posibility of listening to both the analogue inputs
and the digital audio.
Signed-off-by: Peter Christensen <peter@developers.dk>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

sound/pci/ice1712/aureon.h

@@ -47,6 +47,11 @@ extern struct snd_ice1712_card_info  snd_vt1724_aureon_cards[];
 #define AUREON_DIGITAL_SEL1	(1 << 15)
 #define AUREON_HP_SEL		(1 << 14)
 #define AUREON_WM_CS		(1 << 12)
+#define AUREON_AC97_COMMIT	(1 << 11)
+#define AUREON_AC97_ADDR	(1 << 10)
+#define AUREON_AC97_DATA_LOW	(1 << 9)
+#define AUREON_AC97_DATA_HIGH	(1 << 8)
+#define AUREON_AC97_DATA_MASK	0xFF
 
 /* Prodigy has different pin assignment for chip select */
 #define PRODIGY_CS8415_CS	(1 << 23)

sound/pci/ice1712/ice1712.h

@@ -362,6 +362,8 @@ struct _snd_ice1712 {
 	union {
 		/* additional i2c devices for EWS boards*/
 		snd_i2c_device_t *i2cdevs[3];
+		/* AC97 register cache for Aureon */
+		unsigned short stac9744[64];
 		/* Hoontech-specific setting */
 		struct hoontech_spec {
 			unsigned char boxbits[4];