25 Oct
2021
25 Oct
'21
12:52 p.m.
On Sun, Oct 24, 2021 at 10:58:37AM +0200, Vincent Knecht wrote:
From: Stephan Gerhold stephan@gerhold.net
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?