[alsa-devel] quick question, BT codec???

Hello, quick question, both s3c24xx-pcm.c and pxa2xx-pcm.c contain the following comment and code segment, what does the "BT codec" refer to?

/* return if this is a bufferless transfer e.g. * codec <--> BT codec or GSM modem -- lg FIXME */ if (!dma) return 0;