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SubjectRe: Nokia N900 headset detection & MIC Bias + TVOUT
On Sat, Jan 07, 2017 at 12:07:49AM +0100, Pali Rohár wrote:

> All that is needed in N900 sound driver, file sound/soc/omap/rx51.c. Can
> you help me which functions should I call to enable/disable it
> correctly? In headset detection code I need to be sure that nobody
> (other kernel drivers or userspace via alsamixer) except current
> function could change Bias settings.

> MIC Bias is controlled by MICBIAS_CTRL in aic34 'B' part codec, file
> tlv320aic3x.c.

Microphone biases are normally controlled by supply widgets and managed
via DAPM. You can see quite a few examples of this in existing drivers.
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