[alsa-devel] [PATCH] ASoC: rt5670: add HS ground control

[Mark Brown]

On Thu, Feb 02, 2017 at 02:38:55AM +0000, Bard Liao wrote:

> It is a codec GPIO, indeed. But we don't register it to gpiolib.
> So there is no other way to touch the GPIO. We are using it to
> do headset ground control and we should control its level according
> to if headset is using. That's why we control it by a DAPM event.

So one option here would be to register it with gpiolib...
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