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media: cec: rework the cec event handling

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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>
This commit is contained in:
Hans Verkuil 2017-07-11 03:30:39 -03:00 • committed by Mauro Carvalho Chehab
parent 6303d97873
commit 6b2bbb0874
4 changed files with 125 additions and 70 deletions
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3
include/uapi/linux/cec.h
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@ -412,6 +412,7 @@ struct cec_log_addrs {
#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.
@ -424,7 +425,7 @@ struct cec_event_state_change {
};
/**
* 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 {