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media: cec: add CEC_EVENT_PIN_HPD_LOW/HIGH events

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Add support for two new low-level events: PIN_HPD_LOW and PIN_HPD_HIGH.

This is specifically meant for use with the upcoming cec-gpio driver
and makes it possible to trace when the HPD pin changes. Some HDMI
sinks do strange things with the HPD and this makes it easy to debug
this.

Note that this also moves the initialization of a devnode mutex and
list to the allocate_adapter function: if the HPD is high, then as
soon as the HPD interrupt is created an interrupt occurs and
cec_queue_pin_hpd_event() is called which requires that the devnode
mutex and list are initialized.

Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
This commit is contained in:
Hans Verkuil 2017-08-15 10:07:25 -04:00 • committed by Mauro Carvalho Chehab
parent da634f623e
commit 333ef6bd10
6 changed files with 52 additions and 10 deletions
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2
include/uapi/linux/cec.h
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@ -410,6 +410,8 @@ struct cec_log_addrs {
#define CEC_EVENT_LOST_MSGS 2
#define CEC_EVENT_PIN_CEC_LOW 3
#define CEC_EVENT_PIN_CEC_HIGH 4
#define CEC_EVENT_PIN_HPD_LOW 5
#define CEC_EVENT_PIN_HPD_HIGH 6
#define CEC_EVENT_FL_INITIAL_STATE (1 << 0)
#define CEC_EVENT_FL_DROPPED_EVENTS (1 << 1)