ALSA SoC TWL4030 driver

ALSA SoC TWL4030 driver

[Maximilian Schwerin]

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Hi,

I'm currently working on a beagle board clone.

I've got some problems getting the micbias1 output on the TPS65950 to work. I can record audio coming from a line out or if I connect micbias1 to an extern 1.8V supply. 

/sys/devices/platform/soc-audio/TWL4030/dapm_widget shows Mic Bias 1 to be off at all times. Is there something I have to do to enable this other than to start recording? Or could this be a bug in the driver? Does anyone have experience with the mic input of the TPS65950?

Thanks, Maximilian

____________________________________________________________

Maximilian Schwerin                     mailto:mvs@tigris.de
Tigris Elektronik GmbH                  http://www.tigris.de
Wikingerufer 7                         Tel: +49-30-301048-30
10555 Berlin, Germany                  Fax: +49-30-301048-59
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Geschäftsführer:              Henry Westphal, Guido Kuhlmann
Sitz der Gesellschaft:                                Berlin
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Re: ALSA SoC TWL4030 driver

[Péter Ujfalusi]

On Tuesday 16 August 2011 15:33:09 Maximilian Schwerin wrote:
> Hi,
> 
> I'm currently working on a beagle board clone.
> 
> I've got some problems getting the micbias1 output on the TPS65950 to work.
> I can record audio coming from a line out or if I connect micbias1 to an
> extern 1.8V supply.
> 
> /sys/devices/platform/soc-audio/TWL4030/dapm_widget shows Mic Bias 1 to be
> off at all times. Is there something I have to do to enable this other than
> to start recording? Or could this be a bug in the driver? Does anyone have
> experience with the mic input of the TPS65950?

In your machine driver you need to connect the corresponding mic bias, like it 
is done in for example for zoom2:

	/* Headset Mic: HSMIC with bias */
	{"HSMIC", NULL, "Headset Mic Bias"},
	{"Headset Mic Bias", NULL, "Headset Mic"},

Note: Beagle only have support for line-in, does your board have additional 
inputs jack (Headset?)

-- 
Péter
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