[alsa-devel] [PATCH] hda: STAC927x analog mic

[Takashi Iwai]

At Wed, 20 Feb 2008 21:49:59 -0500,
Matthew Ranostay wrote:
> 
> Some laptops have a internal analog microphone that is not setup by the BIOS.
> 
> Signed-off-by: Matthew Ranostay <mranostay at embeddedalley.com>

Applied to HG tree.

BTW, are there boards / machines that have both analog and digital
mics?  Currently, we have "Digital Capture Volume".  It was introduced
as an alternative volume control for digital mics.  But, this seems
confusing people a lot because this volume works correctly at 50%,
corresponding to 0dB.  For systems that have only analog mics, this
control doesn't make much sense.

Thus, I would love to make this control depending on the presence of
digital mic if possible...


thanks,

Takashi

> ---
> diff -r 6b53fa114faa pci/hda/patch_sigmatel.c
> --- a/pci/hda/patch_sigmatel.c	Tue Feb 19 15:03:57 2008 +0100
> +++ b/pci/hda/patch_sigmatel.c	Wed Feb 20 17:11:51 2008 -0500
> @@ -3629,6 +3629,8 @@ static int patch_stac927x(struct hda_cod
>  		spec->mixer = stac927x_mixer;
>  		break;
>  	case STAC_DELL_BIOS:
> +		/* configure the analog microphone on some laptops */
> +		stac92xx_set_config_reg(codec, 0x0c, 0x90a79130);
>  		/* correct the front output jack as a hp out */
>  		stac92xx_set_config_reg(codec, 0x0f, 0x02270110);
>  		/* correct the front input jack as a mic */
>