[libcamera-devel] where is the source code of v4l2 compatibility layer?

[小明__]

Hi guys,
  I don't know if it is good to ask this question here, but I realy have no ideas after spent a lot of time on google.
  I want to learn about V4L2 compatibility layer but it seems the source code is not in libcamera.git repository.
  Can anybody help?
  Thank you very much.
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