On Wed, Apr 22, 2009 at 11:30:32AM +0300, Jarkko Nikula wrote: > On Wed, Apr 22, 2009 at 4:56 AM, Joonyoung Shim <jy0922.shim@xxxxxxxxxxx>wrote: > > + /* return if this is a bufferless transfer e.g. > > + * codec <--> BT codec or GSM modem -- lg FIXME */ > > if (!dma_data) > > - return -ENODEV; > > + return 0; > I see exactly similar lines in s3c24xx-pcm.c but don't point now the use > case where this is used and I don't have idea what is this all about. The use case is for dummy DAIs used to represent bluetooth and similar - they aren't going to do any DMA so don't pass anything to the platform. > Is this something where DAI driver or another end of connection is used to > provide clocking and the whole setup is then controlled with ALSA PCM API? > Somehow I have the feeling that would there be a better way to achieve it > than with dummy bufferless transfer? The host isn't transferring any data at all in these cases. Ideally we'd support multiple platforms and there'd be a dummy platform driver to go with the dummy DAI driver. _______________________________________________ Alsa-devel mailing list Alsa-devel@xxxxxxxxxxxxxxxx http://mailman.alsa-project.org/mailman/listinfo/alsa-devel
