[PATCH 0/4] usb: gadget: audio: add bi-directional volume and mute support

Hi,

These are patches implementing volume and mute support in audio gadget from Ruslan Bilovol 
https://patchwork.kernel.org/project/linux-usb/list/?series=439931 rebased 
for the latest async feedback patches (Ruslan authored, Jerome modified)
already pushed to mainline.

Patches 1 and 4 are basically intact, patches for f_uac2 had to be modified 
for the changes in the final feedback patches.

I tested the f_uac2 code to work correctly.

Rebased patches for switching among multiple rates originally authored by Julian Sheel
https://lore.kernel.org/patchwork/patch/803422/
are to follow, thank you for reviewing and accepting this patchset first.

Best regards,

Pavel Hofman.