On 5/7/24 14:51, Wesley Cheng wrote:
In order to allow userspace/applications know about USB offloading status, expose a sound kcontrol that fetches information about which sound card index is associated with the ASoC platform card supporting offloading. In the USB audio offloading framework, the ASoC BE DAI link is the entity responsible for registering to the SOC USB layer. SOC USB will expose more details about the current offloading status, which includes the USB sound card and USB PCM device indexes currently being used.
It is expected for the USB offloading driver to add the kcontrol to the sound card associated with the USB audio device. An example output would look like:
tinymix -D 1 get 'USB Offload Playback Capable Card' 0 (range -1->32)
You already gave the following examples in patch 29:
" USB offloading idle: tinymix -D 0 get 'USB Offload Playback Route Status' -->-1, -1 (range -1->32)
USB offloading active(USB card#1 pcm#0): tinymix -D 0 get 'USB Offload Playback Route Status' -->1, 0 (range -1->32) "
Can you clarify how many controls there would be in the end? Also isn't tinymix -D N going to give you the controls for card N?