Implementation of support for audio controls in accordance with the proposed extension of the virtio sound device specification [1].
Design　of virtual audio controls is based on and derived from ALSA audio controls. It allows the driver to perform all standard operations, such as reading and writing audio control value, as well as working with metadata (represented in the TLV form).
The driver part was tested on top of the Linux 5.10 kernel.
As a device part was used OpenSynergy proprietary implementation.
[1] https://lists.oasis-open.org/archives/virtio-comment/202104/msg00013.html
Anton Yakovlev (1): ALSA: virtio: add support for audio controls
include/uapi/linux/virtio_snd.h | 154 +++++++++++ sound/virtio/Makefile | 1 + sound/virtio/virtio_card.c | 21 ++ sound/virtio/virtio_card.h | 22 ++ sound/virtio/virtio_kctl.c | 464 ++++++++++++++++++++++++++++++++ 5 files changed, 662 insertions(+) create mode 100644 sound/virtio/virtio_kctl.c