linux-kernel - Re: [PATCH] New ASoC Drivers for ADI AD1938 codec

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Date:	Mon, 13 Jul 2009 10:15:38 +0100
From:	Mark Brown <broonie@...nsource.wolfsonmicro.com>
To:	宋宝华 <21cnbao@...il.com>
Cc:	lrg@...mlogic.co.uk, alsa-devel@...a-project.org,
	linux-kernel@...r.kernel.org, Mike Frysinger <vapier.adi@...il.com>
Subject: Re: [PATCH] New ASoC Drivers for ADI AD1938 codec

On Mon, Jul 13, 2009 at 04:12:14PM +0800, 宋宝华 wrote:

> I want to use ADC/DAC widgets.
> static const struct snd_soc_dapm_widget ad1938_dapm_widgets[] = {
>         SND_SOC_DAPM_DAC("DAC", "HiFi Playback", AD1938_DAC_CTRL0, 0, 1),
>         SND_SOC_DAPM_ADC("ADC", "HiFi Capture", AD1938_ADC_CTRL0, 0, 1),
> };
> But for this AD1938 codec, DAC's work depends on ADC is powered on in
> hardware.  I think there is no any mechanism to handle this kind of
> strange depending now.  So is there a generic way to handle this?

Make the ADC power a SND_SOC_DAPM_SUPPLY() supplying both the DAC and
the ADC, with the ADC widget marged as having no power management.
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