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We need to manage the kcontrol entries association for the LED trigger
from the user space. This patch adds a layer to the sysfs tree like:
/sys/devices/virtual/sound/ctl-led/mic
+ card0
| + attach
| + detach
| ...
+ card1
+ attach
...
Operations:
attach and detach
- amixer style ID is accepted and easy strings for numid and
simple names
reset
- reset all associated kcontrol entries
list
- list associated kcontrol entries (numid values only)
Additional symlinks:
/sys/devices/virtual/sound/ctl-led/mic/card0/card ->
/sys/class/sound/card0
/sys/class/sound/card0/controlC0/led-mic ->
/sys/devices/virtual/sound/ctl-led/mic/card0
Signed-off-by: Jaroslav Kysela <perex@perex.cz>
Link: https://lore.kernel.org/r/20210317172945.842280-7-perex@perex.cz
Signed-off-by: Takashi Iwai <tiwai@suse.de>
a135dfb5de