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analog audio input with cx88-alsa

On Mon, 2007-02-26 at 13:19 -0800, Alex Izvorski wrote:
> On Mon, 2007-02-26 at 12:13 +0000, Ricardo Cerqueira wrote:
> > On Thu, 2007-02-22 at 06:59 -0200, Mauro Carvalho Chehab wrote:
> > > Em Qua, 2007-02-21 Ãs 22:49 +0100, Daniel GlÃckner escreveu:
> > > > On Wed, Feb 21, 2007 at 02:14:54PM -0500, Matthew T. Russotto wrote:
> > > > > At a quick glance, it does not  
> > > > > appear that the CX88 is able to decode baseband audio; it expects  
> > > > > audio at the IF frequency of the tuner.
> > > > 
> > > > Correct, but some cards have an additional stereo ADC that is connected
> > > > via I2S to the CX88 to capture radio or other external audio sources.
> > > For this to work, probably, some additional programming is required.
> > > cx88 module is capable of handing I2S, but this requires some extra
> > > board-specific information (proper mux settings) and if the device
> > > should use i2s for that input(extadc=1 at board description).
> > 
> > Correct. It really depends on the board. We are missing some I2S
> > configuration in the cx88 modules, but the fix is trivial.
> > I have a couple of boards with this working fine already, but they both
> > have wm8775 ADCs for baseband audio, and that chip happens to be
> > supported.
> > 
> > Board with a different approach (like the multiplexer on the HDTV5500)
> > or a different (unsupported) ADC will probably be out of luck for a
> > while.
> 
> Ricardo - thank you very much ;)  This is awesome, I really didn't
> expect it to be working so quickly once I understood what the problem
> is.  Which cards are working?  Could you send out the patch?

The current version of the patch works perfectly on the board it was
developed with: a Hauppauge HVR-1100.
It's known to cause problems with blackbird design boards, though, so it
still needs to be revised; The fine people at Hauppauge are sending us
an HVR-1300 (blackbird) so we can test this.

--
RC

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