On the DVEVM the volume gain control by the AIC33 codec chip. The
parameters are in the file /sound/oss/davinci-aic33.h if you want to
tune to the hardware of your board.

 

>From an application standpoint, volume control is done through the mixer
calls though. For example to increase the playback gain, use the ioctl
SOUND_MIXER_WRITE_OGAIN.

Best regards,

Loc

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