[alsa-devel] Does amixer have commands to turn on / off Codec TWL4030 analog microphone bias voltage output?

I am using Linux kernel 3.0 and a Logic PD DM3530 SOM LV, looking for the amixer commands to turn on / off analog microphone bias supply. Following lines do not have the bias needed for Headset MIC input:

amixer set 'Analog Left AUXL' nocap amixer set 'Analog Right AUXR' nocap amixer set 'Analog Left Main Mic' nocap amixer set 'Analog Left Headset Mic' cap

Anybody can help?

Thanks,

Philip Chu

principal software engineer LogicPD www.logicpd.com 5 Clock Tower Place, Suite 215 Maynard, MA 01754 Phone: 978-243-2450 Fax: 978-461-1598