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Event handling was always fairly simplistic since there were only two events. With the addition of pin events this needed to be redesigned. The state_change and lost_msgs events are now core events with the guarantee that the last state is always available. The new pin events are a queue of events (up to 64 for each event) and the oldest event will be dropped if the application cannot keep up. Lost events are marked with a new event flag. Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com> Reviewed-by: Maxime Ripard <maxime.ripard@free-electrons.com> Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com> (cherry picked from commit 6b2bbb08747a56dcf4ee33606a06025eca571260) Change-Id: I922f9ef9ae718ed93e02556cc007b2d943c5b11d Signed-off-by: Algea Cao <algea.cao@rock-chips.com>