On Wed, 2008-06-25 at 14:42 +0300, Jarkko Nikula wrote:
> Hi
>
> At least tlv320aic3x codec has several use cases where multiple register
> bits are needed to change when widget power state changes and where
> these are not worth/safe to expose into user space. Like mic bias
> voltage.
>
> Currently there is one use case for this multiple bit change in tlv320aic3x:
>
> SND_SOC_DAPM_MICBIAS("Mic Bias AVDD", MICBIAS_CTRL, 6, 0),
> SND_SOC_DAPM_MICBIAS("Mic Bias AVDD", MICBIAS_CTRL, 7, 0),
>
> There are two problems with that:
>
> 1. Two widgets having the same name and thus snd_soc_dapm_add_route will
> add only first one them into audio path
> 2. Even then bits aren't modified at once and thus some fault bit
> configuration might be present while power state is changing.
>
> So I came with this idea of generic register modifiers widget and event
> handler for it.
>
Any chance you could also add a little text to
Docs/sound/alsa/soc/dapm.txt for this.
Thanks
Liam
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