Heh, this is kind of the opposite problem I had to manage -- I had 8 codecs that needed to appear as a single card, over a single TDM bus.
I could not find a good way to do it, so i did it in a bad way, by modifying the codec driver to appear to the kernel as a single codec, but drive all 8 codecs directly from a single instantiated codec.
The sticky point that I couldn't find a good resolution to, is that the dai_link specifies a physical connection from CPU to codec. However, it's a point to point link, which does not allow for multiple codecs on the same active dai link at the same time. the sound/soc/soc-core.c does does not currently start multiple codecs when starting a card (as far as I can tell).
i think you can create 8 dai_links, but I don't suspect you'll be able to open all 8, at the same time.
What's the point of doing this anyway? Why do you want it to appear as 8 sound cards? It seems that you can manage the 8 channels from user space easily enough.
-Caleb
On Tue, Jun 21, 2011 at 10:15 AM, Jason Fox jfox@gai-tronics.com wrote:
Hello everyone,
I am looking for some help where I need an AD193X codec to be shared between 8 audio streams using one SSC channel on an AT91SAM9263, in other words, I need it to look like 8 different soundcards. We have the 8 TDM channels working in the driver but I can't figure out how to create the proper interface of 8 soundcards for ALSA. In an earlier email in this topic was posted:
I would instantiate one driver with 3 pcms. This would allow:-
pcm0: 2 channel, slot 0,1 pcm1: 2 channel, slot 2,3 pcm2: 4 channel, slot 0,1,2,3
Giving full flexibility for many use cases. The pcms would be mutually exclusive (enforced by machine driver).
HTH
Liam
I think that maybe that I want to instantiate one driver with 8 pcms. Where/how do I instantiate the PCMs? I guess it in in the machine driver?
This is our first attempt at developing a Linux based system so please forgive my newbie question. I am sure this is really simple but I'm not following somewhere.
Thanks for your help, Jason Fox GAI-Tronics
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