Lakka-LibreELEC/projects/RPi/filesystem/usr/share/alsa/cards/bcm2835_alsa.conf

<confdir:pcm/iec958.conf>
bcm2835_alsa.pcm.iec958.0 {
    @args [ CARD AES0 AES1 AES2 AES3 ]
    @args.CARD {
        type string
    }
    @args.AES0 {
        type integer
    }
    @args.AES1 {
        type integer
    }
    @args.AES2 {
        type integer
    }
    @args.AES3 {
        type integer
    }
    type hooks
    slave.pcm {
        type hw
        card $CARD
        device 1
    }
    hooks.0 {
        type ctl_elems
        hook_args [
            {
                interface PCM
                name "IEC958 Playback Default"
                lock true
                preserve true
                value [ $AES0 $AES1 $AES2 $AES3 ]
            }
        ]
    }
}