alsa-lib/src/cards/SI_7018.conf

#
# Configuration for the SI7018 chip
#

cards.SI_7018.pcm.front.0 {
	@args [ CARD ]
	@args.CARD {
		type string
	}
	type hw
	card $CARD
	device 0
}	

cards.SI_7018.pcm.rear.0 {
	@args [ CARD ]
	@args.CARD {
		type string
	}
        type hooks
	slave.pcm {
		type hw
		card $CARD
		device 0
	}
	hooks.0 {
		type ctl_elems
		hook_args [
			{
				name "PCM Playback Volume"
				preserve true
				lock true
				value [ 24 24 ]
			}
		]
	}
}	

cards.SI_7018.pcm.surround40.0 {
	@args [ CARD ]
	@args.CARD {
		type string
	}
	type multi
	slaves [
		{
			pcm {
				@func concat
				strings [
					"cards.SI_7018.pcm.front.0:CARD=" $CARD
				]
			}
			channels 2
		}
		{
			pcm {
				@func concat
				strings [
					"cards.SI_7018.pcm.rear.0:CARD=" $CARD
				]
			}
			channels 2
		}
	]
	bindings [
		{ slave 0 channel 0 }
		{ slave 0 channel 1 }
		{ slave 1 channel 0 }
		{ slave 1 channel 1 }
	]
}