USBVideoDriver: add support LogiLink UA0379

[jluebbe]

This is pretty similar to the existing JPEG cameras and supports manual focus control.

Also do some minor clean-ups while we are here.

[jonrebm]

Thank you.

Using this branch, I don't seem to have auto focus (with or without extra options) and I still can't seem to influence the focus using options such as:

-c 'focus_automatic_continuous=0,focus_absolute=0'
-c 'focus_automatic_continuous=0,focus_absolute=40'
-c 'focus_automatic_continuous=0,focus_absolute=100'
-c 'focus_auto=0,focus_absolute=100'

[jluebbe]

The control names have changed in the kernel since torvalds/linux@70fa906, which is included in v5.16. Thanks to @michaelolbrich for finding it.

It was accepted here: https://patchwork.linuxtv.org/project/linux-media/patch/[email protected]/

So, to re-enable autofocus, you need to use -c 'focus_automatic_continuous=1'. In a separate PR we'll likely need to detect new/old kernels (via uname -r?) and select the corresponding control name...

[jonrebm]

I see, thank you. The value range for focus_absolute is larger than I thought. It works for me with fixed focus:

labgrid-client video -c "focus_absolute=300"

or automatic focus:

labgrid-client video -c "focus_automatic_continuous=1"

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 13 lines in your changes missing coverage. Please review.

Project coverage is 56.6%. Comparing base (71bfcd2) to head (87cc175).
Report is 20 commits behind head on master.

Files with missing lines	Patch %	Lines
labgrid/driver/usbvideodriver.py	0.0%	13 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff            @@
##           master   #1486     +/-   ##
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- Coverage    56.6%   56.6%   -0.1%     
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  Files         168     168             
  Lines       13033   13037      +4     
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  Hits         7385    7385             
- Misses       5648    5652      +4     

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