Hi,

As promised, those are patches that extend patch_sigmatel.c driver to add missing functionality

They all are runtime tested with my STAC9227, and datasheet tested with others Note that I did my best to ensure that even if a codec doesn't support a feature (and I don't know sbout that), maximum impact will be a new, non-working mixer control

STAC927x are almost exactly the same as STAC922x, but have DAC4

1) Center/LFE swap : It can be sometimes useful to swap those channels, since they are on same line.

I add that control only in case Center/LFE DAC is there, and supports L/R swap, it should be very safe.

2) Analog loopback: Added for 922x, 927x, and for 9204/5 which has a different verb, that offers same analog loopback

3) Volume Knob: Added for 9204/5, 9220/1/3, 922x 92-7x I made it a master volume

4) Fixed support for codecs that have 2 or 3 ADC: I added separate mixer controls for all 2/3 ADCs, and made PCM capture device sub-streams count to depend on actual number of ADCs

I am looking for your comments, Best regards, Maxim Levitsky