PowerMac G4 audio input

[Andriy Rysin]

Can anybody please tell whether it's possible to make audio input in G4
available in powermac alsa driver? My G4 (QuickSilver) has audio input 
but I it seems like the driver does not support it. I took a look at 
sources and it seems like audio input enabled only for some powerbooks. 
Is it just a matter of enabling the input in the driver or support for 
G4 audio input is not yet written?
I would prefer alsa though if it can be done in OSS I would be glad to 
hear it.

Thanks in advance,
Andriy