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/f1e637b285e8e04e6761248a070f58f3a8fde6fc
The second thing is the If block:
https://github.com/alsa-project/alsa-lib/commit/985715ce8148dc7ef62c8e3d8ce5a0c2ac51f8df
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/60164fc5886cdc6ca55eeed0c2e3f751a7d2b2c0
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/723b6da881721488229154e923ed36413955a051
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=for-5.5&id=d745cc1ab65945b2d17ec9c5652f38299c054649
Thanks,
Jaroslav
--
Jaroslav Kysela <perex@xxxxxxxx>
Linux Sound Maintainer; ALSA Project; Red Hat, Inc.
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