Alsa soc UDA1380 - no duplex

Alsa soc UDA1380 - no duplex

[jarek]

Hello!

	I've received information from lpclinux.com that uda1380 on lpc313x
doesn't support duplex.
	I've got some information that uda1380 on s3c24xx works with duplex, so
I think, that it should work also on lpc313x. I'm ready to write some
code, but I have no experience with ALSA, so I'll be happy if someone
will give me some hints where to start.
	The other question is why there are two drivers to the same device.

best regards
Jarek

Re: Alsa soc UDA1380 - no duplex

[Vasily Khoruzhick]

2012/4/3 jarek <jarek@poczta.srv.pl>:
> Hello!
>
>        I've received information from lpclinux.com that uda1380 on lpc313x
> doesn't support duplex.
>        I've got some information that uda1380 on s3c24xx works with duplex, so
> I think, that it should work also on lpc313x. I'm ready to write some
> code, but I have no experience with ALSA, so I'll be happy if someone
> will give me some hints where to start.

Probably it's lpc313x limitation (CPU DAI does not support duplex?)
Anyway, looks like its code is not upstreamed.

>        The other question is why there are two drivers to the same device.

AFAIK there's only one driver for uda1380 codec.

Regards
Vasily
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Re: Alsa soc UDA1380 - no duplex

[Jarek]

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.
http://ics.nxp.com/products/lpc3000/datasheet/lpc3130.lpc3131.pdf

> 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):

http://www.lpclinux.com/pub/Forums/ForumLPC313x0055/lpc.tar.gz
> 
> >        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
difference.
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.

Re: Alsa soc UDA1380 - no duplex

[Jarek]

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.
http://ics.nxp.com/products/lpc3000/datasheet/lpc3130.lpc3131.pdf

> 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):

http://www.lpclinux.com/pub/Forums/ForumLPC313x0055/lpc.tar.gz 
> 
> >        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
difference.
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