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.

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>

1 files changed, 11 insertions, 3 deletions

diff --git a/include/media/cec.h b/include/media/cec.h
index 3776820..6cc862a 100644
--- a/include/media/cec.h
+++ b/include/media/cec.h
@@ -81,7 +81,13 @@ struct cec_msg_entry {
 	struct cec_msg		msg;
 };
 
-#define CEC_NUM_EVENTS		CEC_EVENT_LOST_MSGS
+struct cec_event_entry {
+	struct list_head	list;
+	struct cec_event	ev;
+};
+
+#define CEC_NUM_CORE_EVENTS 2
+#define CEC_NUM_EVENTS CEC_EVENT_PIN_HIGH
 
 struct cec_fh {
 	struct list_head	list;
@@ -92,9 +98,11 @@ struct cec_fh {
 
 	/* Events */
 	wait_queue_head_t	wait;
-	unsigned int		pending_events;
-	struct cec_event	events[CEC_NUM_EVENTS];
 	struct mutex		lock;
+	struct list_head	events[CEC_NUM_EVENTS]; /* queued events */
+	u8			queued_events[CEC_NUM_EVENTS];
+	unsigned int		total_queued_events;
+	struct cec_event_entry	core_events[CEC_NUM_CORE_EVENTS];
 	struct list_head	msgs; /* queued messages */
 	unsigned int		queued_msgs;
 };