[Bug 1885896] Re: Add generic LED class support for audio LED

This bug is awaiting verification that the kernel in -proposed solves
the problem. Please test the kernel and update this bug with the
results. If the problem is solved, change the tag 'verification-needed-
focal' to 'verification-done-focal'. If the problem still exists, change
the tag 'verification-needed-focal' to 'verification-failed-focal'.

If verification is not done by 5 working days from today, this fix will
be dropped from the source code, and this bug will be closed.

See https://wiki.ubuntu.com/Testing/EnableProposed for documentation how
to enable and use -proposed. Thank you!


** Tags added: verification-needed-focal

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https://bugs.launchpad.net/bugs/1885896

Title:
Add generic LED class support for audio LED

Status in HWE Next:
New
Status in linux package in Ubuntu:
Incomplete
Status in linux-oem-5.6 package in Ubuntu:
Invalid
Status in linux source package in Focal:
Invalid
Status in linux-oem-5.6 source package in Focal:
Fix Committed
Status in linux source package in Groovy:
Incomplete
Status in linux-oem-5.6 source package in Groovy:
Invalid

Bug description:
[Impact]
Like GPIO controlled LED, COEF controlled LED also need LED class
support, in order to be used by SoF driver.

[Fix]
Convert all HDA vendor-specific LED control to generic LED class.

[Test]
After applying the patch series, COEF controlled LED is exported under
/sys/class/leds/, so SoF driver now can control the micmute LED.

Also verified on GPIO based micmute LED, it also works fine.

[Regression Potential]
Low. Though there are 13 patches, most of them are straightforward
conversion.

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