Re: [alsa-devel] Does amixer has to be used to make a complete path in ASoC?

On Sun, May 22, 2011 at 05:41:14PM -0700, Feng Ye wrote:

Please fix your mail client to word wrap within paragraphs. I've reflowed your mail for legibility.

I think the problem may not be in the driver, instead, amixer should be used to select the codec mixer settings to build a complete audio path (like the LEFT MIXER in wm8750).

Yes, exactly.

I have following questions:

1.   Is my understanding correct? amixer has to be used before aplay?
   

Yes.

2.   Is there way to do it in the code instead of using amixer?
   

No.

3.   If amixer has to be used, where I can find sample wm8750
   

amixer setting usage for a simple playback from I2S in to Lout1 & Rout1 out?

In general you need to look at the DAPM map in the driver and figure out how to connect whatever your audio source is to an output - most of the control will be in the CODEC. Look at the DAPM routes between the widgets and figure out what to connect - the driver source will have a routing table like your driver has in the form:

{ destination, control, source }

so if control is not NULL the control with the specified name needs to be enabled. The debugfs files for the DAPM widgets (look under asoc/ in debugfs) can help here.