On 04/20/2016 10:51 AM, Petr Kulhavy wrote: > On 20.04.2016 10:33, Lars-Peter Clausen wrote: >> On 04/20/2016 10:03 AM, Petr Kulhavy wrote: >>> Hello, >>> >>> I'm writing a driver for ASoC "sound card" hardware which uses CPU GPIO to >>> mute/unmute an analogue amplifier and another GPIO to control an analogue >>> switch for line/mic switching. Is there an abstraction in ALSA to model this >>> kind of hardware? >> There is no abstraction. Use controls and/or DAPM and the standard GPIO API, >> if you grep the sources you'll find a few examples of drivers using GPIOs to >> mute amplifiers and similar (e.g. qi_lb60). >> >> - Lars > > Thanks, Lars, for the good pointers! I will check that out. > > Is there also a way to map GPIO to a control which then appears e.g. in > alsamixer? That would be useful for the mic/line selection. Rather than exposing the GPIO itself you'd expose the logical function of the GPIO. E.g. in your case a ENUM control that allows to switch between microphone and capture and in the background this sets the GPIO according to the selection. - Lars _______________________________________________ Alsa-devel mailing list Alsa-devel@xxxxxxxxxxxxxxxx http://mailman.alsa-project.org/mailman/listinfo/alsa-devel
