[alsa-devel] Alsa soc UDA1380 - no duplex

Jarek jarek at poczta.srv.pl
Thu Apr 5 19:46:51 CEST 2012

Dnia 2012-04-03, wto o godzinie 18:09 +0300, Vasily Khoruzhick pisze:

> Probably it's lpc313x limitation (CPU DAI does not support duplex?)

Do you know how to check if this is hardware limitation ? I have
reviewed documentation and from my point of view it should work.

> Anyway, looks like its code is not upstreamed.

Yes, I didn't notice before, that all code comes from this patch (for
kernel 3.2):

> >        The other question is why there are two drivers to the same device.
> AFAIK there's only one driver for uda1380 codec.

I've found separete folders for samsung and lpc in sound/soc/ and I
suspected that there are two separate drivers. As I understand now,
there is only separate intermediary layer. The files in those folders
are quite different, so I don't know how to compare them, to find the
In mean time. I have received the following respone from lpclinux:
As I understand,it is the SW limitation limitation because of which we
can not use playback & capture feature simultaneously. The audio driver
code is based on ALSA framework available in sound/soc/lpc313x. Please
give it a try & let us know about the results
I'll be glad, if can take a look at this code.
or just give me some direction 

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