a52: add another a52d configuration with card/dev/subdev scheme

Make Pulseaudio and PipeWire to find the A52 devices.

BugLink: alsa-project#37
Signed-off-by: Jaroslav Kysela <[email protected]>

a52/60-a52-encoder.conf

@@ -28,12 +28,65 @@ pcm.a52 {
 	rate $RATE
 	bitrate $BITRATE
 	channels $CHANNELS
+	hint {
+		show {
+			@func refer
+			name defaults.namehint.extended
+		}
+		description "Plugin to convert multichannel stream to A52 (AC3) bitstream (full device)"
+	}
+}
+
+pcm.a52d {
+	@args [ CARD DEV SUBDEV RATE BITRATE CHANNELS ]
+	@args.CARD {
+		type integer
+		default {
+			@func refer
+			name defaults.pcm.iec958.card
+		}
+	}
+	@args.DEV {
+		type integer
+		default {
+			@func refer
+			name defaults.pcm.iec958.device
+		}
+	}
+	@args.SUBDEV {
+		type integer
+		default 0
+	}
+	@args.SLAVE {
+		type string
+	}
+	@args.RATE {
+		type integer
+		default 48000
+	}
+	@args.BITRATE {
+		type integer
+		default 448
+	}
+	@args.CHANNELS {
+		type string
+		default 6
+	}
+	type a52
+	card $CARD
+	slavepcm {
+		@func concat
+		strings [ "hw:" $CARD "," $DEV "," $SUBDEV ]
+	}
+	rate $RATE
+	bitrate $BITRATE
+	channels $CHANNELS
 	hint {
 		show {
 			@func refer
 			name defaults.namehint.basic
 		}
-                description "Plugin to convert multichannel stream to A52 (AC3) bitstream"
+		description "Plugin to convert multichannel stream to A52 (AC3) bitstream"
 	}
 }