[alsa-devel] [PATCH] ASoC/multi-component: fix au1x platform

Manuel Lauss manuel.lauss at googlemail.com
Thu Aug 19 17:59:24 CEST 2010

On Thu, Aug 19, 2010 at 5:52 PM, Mark Brown
<broonie at opensource.wolfsonmicro.com> wrote:
> On Thu, Aug 19, 2010 at 04:58:55PM +0200, Manuel Lauss wrote:
>> On Thu, Aug 19, 2010 at 4:48 PM, Mark Brown
> Please remember to keep people CCed on Linux mailing list postings.
>> > The struct snd_ac97 * passed in to them has a pointer to the struct
>> > snd_card * for the card which should (via some further indirection)
>> > allow you to get back to the ASoC specific structures.
>> Are there an in-tree examples I could look at?  (and for example on how
>> to pass per-instance platform data around?  It's not immediately obvious
>> to me how to get data allocated in a platform_driver.probe() callback to
>> the various dai_ops and pcm_ops).
> This is the only embedded device I've ever seen where anyone wanted to
> use multiple AC97 controllers so not directly.  If you look at the SoC
> core you can see how the various ALSA structures are converted into ASoC
> specific ones, though.

There are up to four PSCs, each capable of both AC97 and I2S operation,
with separate RX and TX DMA channels. I consider each PSC a separate "card".

I figured out how to access platform data in dai_ops,  however I see absolutely
no way to get at it from the ac97_ops.

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