path: root/drivers/media/v4l2-core/v4l2-event.c
diff options
authorArun Kumar K <arun.kk@samsung.com>2014-05-14 03:59:42 -0300
committerMauro Carvalho Chehab <m.chehab@samsung.com>2014-05-23 19:50:40 -0300
commit3cbe6e5bcad0b102c06b9c6029fda75630045475 (patch)
treea71d0f73af174620f82fd1b5469fef70e9075fe7 /drivers/media/v4l2-core/v4l2-event.c
parent5b340ea0caac4c123a3bb989a43c021a2dc06fb2 (diff)
[media] v4l: Add source change event
This event indicates that the video device has encountered a source parameter change during runtime. This can typically be a resolution change detected by a video decoder OR a format change detected by an input connector. This needs to be nofified to the userspace and the application may be expected to reallocate buffers before proceeding. The application can subscribe to events on a specific pad or input port which it is interested in. Signed-off-by: Arun Kumar K <arun.kk@samsung.com> Acked-by: Sylwester Nawrocki <s.nawrocki@samsung.com> Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com> Signed-off-by: Mauro Carvalho Chehab <m.chehab@samsung.com>
Diffstat (limited to 'drivers/media/v4l2-core/v4l2-event.c')
1 files changed, 36 insertions, 0 deletions
diff --git a/drivers/media/v4l2-core/v4l2-event.c b/drivers/media/v4l2-core/v4l2-event.c
index 86dcb5483c42..8761aab99de9 100644
--- a/drivers/media/v4l2-core/v4l2-event.c
+++ b/drivers/media/v4l2-core/v4l2-event.c
@@ -318,3 +318,39 @@ int v4l2_event_subdev_unsubscribe(struct v4l2_subdev *sd, struct v4l2_fh *fh,
return v4l2_event_unsubscribe(fh, sub);
+static void v4l2_event_src_replace(struct v4l2_event *old,
+ const struct v4l2_event *new)
+ u32 old_changes = old->u.src_change.changes;
+ old->u.src_change = new->u.src_change;
+ old->u.src_change.changes |= old_changes;
+static void v4l2_event_src_merge(const struct v4l2_event *old,
+ struct v4l2_event *new)
+ new->u.src_change.changes |= old->u.src_change.changes;
+static const struct v4l2_subscribed_event_ops v4l2_event_src_ch_ops = {
+ .replace = v4l2_event_src_replace,
+ .merge = v4l2_event_src_merge,
+int v4l2_src_change_event_subscribe(struct v4l2_fh *fh,
+ const struct v4l2_event_subscription *sub)
+ if (sub->type == V4L2_EVENT_SOURCE_CHANGE)
+ return v4l2_event_subscribe(fh, sub, 0, &v4l2_event_src_ch_ops);
+ return -EINVAL;
+int v4l2_src_change_event_subdev_subscribe(struct v4l2_subdev *sd,
+ struct v4l2_fh *fh, struct v4l2_event_subscription *sub)
+ return v4l2_src_change_event_subscribe(fh, sub);

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