[ALSA] switching rate in STAC9460 codec of Prodigy192

* support for switching rate in STAC9460 - using set_rate_val of the akm
infrastructure
* listing all STAC9460 registers in proc
* disabling mpu401 device for Prodigy192 - otherwise the currently
  flawed mpu401 code hangs kernel when opening the midi device
* removing old unused commented-out code
Signed-off-by: Pavel Hofman <dustin@seznam.cz>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Jaroslav Kysela <perex@perex.cz>

include/sound/ak4xxx-adda.h

@@ -68,7 +68,7 @@ struct snd_akm4xxx {
 	enum {
 		SND_AK4524, SND_AK4528, SND_AK4529,
 		SND_AK4355, SND_AK4358, SND_AK4381,
-		SND_AK5365
+		SND_AK5365, NON_AKM
 	} type;
 
 	/* (array) information of combined codecs */

sound/i2c/other/ak4xxx-adda.c

@@ -293,6 +293,11 @@ void snd_akm4xxx_init(struct snd_akm4xxx *ak)
 	case SND_AK5365:
 		/* FIXME: any init sequence? */
 		return;
+	case NON_AKM:
+		/* fake value for non-akm codecs using akm infrastructure
+		 * (e.g. of ice1724) - certainly FIXME
+		 */
+		return;
 	default:
 		snd_BUG();
 		return;

sound/pci/ice1712/ice1712.h

@@ -399,6 +399,8 @@ struct snd_ice1712 {
 		} juli;
 		struct {
 			struct ak4114 *ak4114;
+			/* rate change needs atomic mute/unmute of all dacs*/
+			struct mutex mute_mutex;
 		} prodigy192;
 		struct {
 			struct {