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@samsung.comwrote:
/* 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.