dmaengine: query current transfer status

[Guennadi Liakhovetski]

Hi

I'm using the dmaengine API with an ASoC driver (soon to be submitted), 
and I have to provide a callback to ALSA to query the progress of the 
current transfer (the .pointer() method from struct snd_pcm_ops). 
Currently I only can provide this information with a period size 
precision. Wouldn't it make sense to add an optional hook to dmaengine for 
that? I certainly could add this as a platform-specific extension to the 
specific dmaengine driver, I'm using (shdma), but that'd be ugly. Ideas? 
Specific proposals for the prototype? I could cook up a patch if there are 
no principal objections against this.

Thanks
Guennadi
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Guennadi Liakhovetski
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