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.