analog audio input with cx88-alsa

[Ricardo Cerqueira <rmcc (at) linuxtv.org>]

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.

--
RC

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