At Fri, 21 Dec 2007 16:42:15 -0200, Claudio Matsuoka wrote:

Hi,

I'm working with Herton Krzesinski on a HP Spartan laptop which has a Conexant CX2051 configured with internal and external microphones connected to two different ADC nodes (0x14 and 0x15 in http://helllabs.org/tmp/hp-spartan-ng.png). We were able to get input from one or other ADC, but we weren't able to switch from one capture source to another (switching between 0x17 and 0x1d would be simple, but HP chose to route the external and internal mics to two different ADCs). What is the recommended way to handle this kind of setup?

I'm not sure whether it really works, but it might be possible that the routing can be changed dynamically even during the PCM stream is running by calling snd_hda_codec_setup_stream().

In this case, you'd need a special hda_pcm_ops. In the prepare callback, remember stream_tag and format values. Then assign the active mic input and reset the other. In the unsol event handler, check whether this PCM is running and re-program the stream tag and format appropriately.

Takashi