On 04/20/2016 11:47 AM, Petr Kulhavy wrote:
On 20.04.2016 11:06, Lars-Peter Clausen wrote:
On 04/20/2016 10:51 AM, Petr Kulhavy wrote:
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.
I understand that, my question was more how to hook the enum to a function rather to a codec register?
You can use SOC_ENUM_EXT() to create the control. This macro takes a get and a put callback where you can manipulate the state of the GPIO. And then just register the control with the card.