Nokia N900 headset detection & MIC Bias + TVOUT

[Pali RohÃr]

Hi!

For jack cable and headset detection in Nokia N900 I would need to 
enable/disable MIC Bias and also enable/disable TVOUT output.

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.

And according to RX-51 Schematics TVOUT is controlled by OMAP3430 pins: 
TV_OUT1 and TV_VFB1. I have not found any references to them in kernel, 
just in omap trm. How is OMAP3430's TV_OUT1 controlled?

(Existing code in Maemo 2.6.28 kernel is doing it by big hack - exports 
function which directly modify MICBIAS_CTRL)

-- 
Pali RohÃr
pali.rohar@xxxxxxxxx

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