On Sun, Oct 24, 2021 at 10:58:37AM +0200, Vincent Knecht wrote: > From: Stephan Gerhold <stephan@xxxxxxxxxxx> > > In some configurations it may be necessary to explicitly disable > the amplifier with an ALSA mixer. An example for this is a stereo > setup with two TFA989X. If only one of them should be used (e.g. > to use it as an earpiece) the other one must be explicitly disabled. > > Add a virtual "Amp Switch" to implement that. There is no register > for this (SND_SOC_NOPM) so it only prevents DAPM from activating > the amplifier. Also it is inverted (= enabled by default) for > compatibility with devices that do not need this functionality. Why can you not use a standard pin switch on the speaker output for this?
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