Hi all,
I make some internal ucm code cleanups in alsa-lib and added three major extensions to allow more complex configurations which we require for the SOF kernel driver.
The first thing is the added substitution for the value strings:
https://github.com/alsa-project/alsa-lib/commit/f1e637b285e8e04e6761248a070f...
The second thing is the If block:
https://github.com/alsa-project/alsa-lib/commit/985715ce8148dc7ef62c8e3d8ce5...
The third thing is the card / hardware like specifier passed as the ucm name to snd_use_case_mgr_open() to support multiple card instances:
https://github.com/alsa-project/alsa-lib/commit/60164fc5886cdc6ca55eeed0c2e3...
All those patches (with other cleanups) are in the ucm2 branch on github for comments:
https://github.com/alsa-project/alsa-lib/commits/ucm2
The proposed SOF UCM config diff is here:
https://github.com/alsa-project/alsa-ucm-conf/commit/723b6da881721488229154e... https://github.com/alsa-project/alsa-ucm-conf/commits/ucm2
I added everything to keep the interface backward compatible, so the current applications should not observe any different behavior. The applications like pulseaudio should use the 'hw:CARD_INDEX' specifier for the open call in the future and snd_use_case_parse_ctl_elem_id() helper for the element control names.
If you have another ideas to address those issues, please, let me know.
BTW, Mark: The SOF UCM configs relies on the driver name changes, so it might be worth to send "ASoC: intel - fix the card names" patch to 5.4 to make things stable more quickly:
https://git.kernel.org/pub/scm/linux/kernel/git/broonie/sound.git/commit/?h=...
Thanks, Jaroslav