https://github.com/torvalds/linux
- HEAD
- refs/heads/arm64-uaccess
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/certifi-2024.7.4
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/idna-3.7
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/requests-2.32.2
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/setuptools-70.0.0
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/urllib3-2.2.2
- refs/heads/master
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Tip revision: 32b88194f71d6ae7768a29f87fbba454728273ee authored by Linus Torvalds on 25 October 2015, 01:39:47 UTC
Linux 4.3-rc7
Linux 4.3-rc7
Tip revision: 32b8819
Jack-Controls.txt
Why we need Jack kcontrols
==========================
ALSA uses kcontrols to export audio controls(switch, volume, Mux, ...)
to user space. This means userspace applications like pulseaudio can
switch off headphones and switch on speakers when no headphones are
pluged in.
The old ALSA jack code only created input devices for each registered
jack. These jack input devices are not readable by userspace devices
that run as non root.
The new jack code creates embedded jack kcontrols for each jack that
can be read by any process.
This can be combined with UCM to allow userspace to route audio more
intelligently based on jack insertion or removal events.
Jack Kcontrol Internals
=======================
Each jack will have a kcontrol list, so that we can create a kcontrol
and attach it to the jack, at jack creation stage. We can also add a
kcontrol to an existing jack, at anytime when required.
Those kcontrols will be freed automatically when the Jack is freed.
How to use jack kcontrols
=========================
In order to keep compatibility, snd_jack_new() has been modified by
adding two params :-
- @initial_kctl: if true, create a kcontrol and add it to the jack
list.
- @phantom_jack: Don't create a input device for phantom jacks.
HDA jacks can set phantom_jack to true in order to create a phantom
jack and set initial_kctl to true to create an initial kcontrol with
the correct id.
ASoC jacks should set initial_kctl as false. The pin name will be
assigned as the jack kcontrol name.