init

squashfs-root/usr/share/alsa/pcm/surround40.conf

@@ -0,0 +1,59 @@
+#
+#  Hardware output from 4.0 speakers.
+#  Samples must be positioned:
+#    chn0 - front left
+#    chn1 - front right
+#    chn2 - rear left
+#    chn3 - rear right
+#
+
+pcm.!surround40 {
+	@args [ CARD DEV ]
+	@args.CARD {
+		type string
+		default {
+			@func getenv
+			vars [
+				ALSA_SURROUND40_CARD
+				ALSA_PCM_CARD
+				ALSA_CARD
+			]
+			default {
+				@func refer
+				name defaults.pcm.surround40.card
+			}
+		}
+	}
+	@args.DEV {
+		type integer
+		default {
+			@func igetenv
+			vars [
+				ALSA_SURROUND40_DEVICE
+			]
+			default {
+				@func refer
+				name defaults.pcm.surround40.device
+			}
+		}
+	}
+	type empty
+	slave.pcm {
+		@func refer
+		name {
+			@func concat
+			strings [
+				"cards."
+				{
+					@func card_driver
+					card $CARD
+				}
+				".pcm.surround40." $DEV ":CARD=" $CARD
+			]
+		}
+	}
+	hint {
+		description "4.0 Surround output to Front and Rear speakers"
+		device_output $DEV
+	}
+}