SNDRV_CHMAP_TFC
{ SNDRV_CHMAP_TFC, FCH },
[SNDRV_CHMAP_TFC] = "TFC",
SNDRV_CHMAP_TFC, /* top front center */
map = SNDRV_CHMAP_TFC;
[VIRTIO_SND_CHMAP_TFC] = SNDRV_CHMAP_TFC,