Added iec958 PCM definition

src/alsa.conf

@@ -197,3 +197,49 @@ rawmidi.hw {
 seq.hw {
 	type hw
 }
+
+pcm.iec958 {
+	$.0 PCM
+        $.1 AES0
+        $.2 AES1
+        $.3 AES2
+        $.4 AES3
+	$.PCM {
+		type string
+		default default
+	}
+	$.AES0 {
+		type integer
+		# IEC958_AES0_PROFESSIONAL | IEC958_AES0_NONAUDIO |
+		# IEC958_AES0_PRO_EMPHASIS_NONE | IEC958_AES0_PRO_FS_48000
+		default 0x87
+	}
+	$.AES1 {
+		type integer
+		default 0x00
+	}
+	$.AES2 {
+		type integer
+		default 0x00
+	}
+	$.AES3 {
+		type integer
+		default 0x00
+	}
+	type hooks
+	slave.pcm $PCM
+	hooks.0 {
+		type ctl_elems
+		args.0 {
+			name "IEC958 Playback PCM Stream"
+			subdevice 0
+			preserve true
+			lock true
+			value.0 $AES0
+			value.1 $AES1
+			value.2 $AES2
+			value.3 $AES3
+		}
+	}
+}
+