media: cec: rework the cec event handling

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.

Hans Verkuil committed 9 years ago

Commit 6b2bbb01 parent 6303d974 files · +124 −69Browse files

Showing the changes to include/uapi/linux (1 of 4 files). Show all

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include/uapi/linux/cec.h+2−1

 #define CEC_EVENT_PIN_HIGH		4
 #define CEC_EVENT_FL_INITIAL_STATE	(1 << 0)
+#define CEC_EVENT_FL_DROPPED_EVENTS	(1 << 1)
 /**
  * struct cec_event_state_change - used when the CEC adapter changes state.
 };
 /**
- * struct cec_event_lost_msgs - tells you how many messages were lost due.
+ * struct cec_event_lost_msgs - tells you how many messages were lost.
  * @lost_msgs: how many messages were lost.
  */
 struct cec_event_lost_msgs {