Hello. This is not related to alsa, but I decided to write this message here, because as far as I know alsa has the best open source driver for asus xonar series. I am using DragonFlyBSD and a bit modified driver originally written for FreeBSD by Alexander Polakov https://github.com/shamazmazum/xonar-dragonfly
It lacks support for recording. I am trying to add this functionality from alsa/OSS drivers, but I have some unanswered questions. There are they here:
1) How do I initialize my soundcard for recording properly? I think I must enable CS5381 ADC using GPIO registers, but what are OXYGEN_REC_ROUTING, OXYGEN_ADC_MONITOR and OXYGEN_A_MONITOR_ROUTING for? Does MONITOR mean the same thing as in the user manual? If ROUTING registers are just switches for source of a signal to be recorded, is it enough to use OXYGEN_REC_B_ROUTE_I2S_ADC_2 for ST card to record from line-in/mic jack?
2) How do I control volume of sound while recording? Have Xonar Essence cards any controls for this? I cannot find it out looking at oxygen_mixer.c