ALSA: usb-audio: update clock valid control

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Make the "clock valid" control a global control instead of a mixer
so that it doesn't appear in mixer applications.

Additionally, remove the check for writeability prohibited by spec, and
Use common code to read the control value.

Tested with a UAC2 Audio device that presents a clock validity
control.  The control still shows up in /proc usbmixer but not
in alsamixer.

Signed-off-by: Andrew Chant <achant@google.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

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Andrew Chant 2018-03-23 19:25:24 -07:00 • committed by Takashi Iwai

parent 5a222e8494

commit 568fa7e087

1 changed files with 19 additions and 14 deletions

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sound/usb/mixer.c

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