media: cec: add core support for low-level CEC pin monitoring
Add support for the new MONITOR_PIN mode.
Add the cec_pin_event function that the CEC pin code will call to queue pin
change events.
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>
diff --git a/drivers/media/cec/cec-adap.c b/drivers/media/cec/cec-adap.c
index 5080d7aa..b0bd466 100644
--- a/drivers/media/cec/cec-adap.c
+++ b/drivers/media/cec/cec-adap.c
@@ -153,6 +153,22 @@ static void cec_queue_event(struct cec_adapter *adap,
mutex_unlock(&adap->devnode.lock);
}
+/* Notify userspace that the CEC pin changed state at the given time. */
+void cec_queue_pin_event(struct cec_adapter *adap, bool is_high, ktime_t ts)
+{
+ struct cec_event ev = {
+ .event = is_high ? CEC_EVENT_PIN_HIGH : CEC_EVENT_PIN_LOW,
+ };
+ struct cec_fh *fh;
+
+ mutex_lock(&adap->devnode.lock);
+ list_for_each_entry(fh, &adap->devnode.fhs, list)
+ if (fh->mode_follower == CEC_MODE_MONITOR_PIN)
+ cec_queue_event_fh(fh, &ev, ktime_to_ns(ts));
+ mutex_unlock(&adap->devnode.lock);
+}
+EXPORT_SYMBOL_GPL(cec_queue_pin_event);
+
/*
* Queue a new message for this filehandle.
*