Understanding v4l2-ctl flags

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Hi,

I have a Logitech webcam under PWC.
I've managed to use v4l2-ctl to change come controls, but some of them seem to be unsupported.

v4l2-ctl reports the following flags

inactive
update
slider
write-only
** no flags at all **

e.g.

restore_factory_settings (button) : flags=update, write-only

What is the meaning of them?
I can guess that inactive means unsupported, but do I care about the others?

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