[media] v4l2-subdev: allow subdev to send an event to the v4l2_device notify function

All drivers use custom notifications, in particular when source changes.
The bridge only has to map the subdev that sends it to whatever video node it is connected to.

Signed-off-by: Jean-Michel Hautbois <jean-michel.hautbois@vodalys.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>

diff --git a/Documentation/video4linux/v4l2-framework.txt b/Documentation/video4linux/v4l2-framework.txt
index 59e619f9bbf54558f69a97405100d036b09d20d6..75d5c18d689aaaaa14b7e365c9650d0502c95799 100644 (file)
--- a/Documentation/video4linux/v4l2-framework.txt
+++ b/Documentation/video4linux/v4l2-framework.txt
@@ -1129,6 +1129,10 @@ available event type is 'class base + 1'.
 An example on how the V4L2 events may be used can be found in the OMAP
 3 ISP driver (drivers/media/platform/omap3isp).
 
+A subdev can directly send an event to the v4l2_device notify function with
+V4L2_DEVICE_NOTIFY_EVENT. This allows the bridge to map the subdev that sends
+the event to the video node(s) associated with the subdev that need to be
+informed about such an event.
 
 V4L2 clocks
 -----------

diff --git a/include/media/v4l2-subdev.h b/include/media/v4l2-subdev.h
index 8f5da73dacff9f8c72af150918ec4fd88a9ec253..dc20102ff600bc9834ed6d83963cfc09816a8c0e 100644 (file)
--- a/include/media/v4l2-subdev.h
+++ b/include/media/v4l2-subdev.h
@@ -40,6 +40,8 @@
 #define V4L2_SUBDEV_IR_TX_NOTIFY               _IOW('v', 1, u32)
 #define V4L2_SUBDEV_IR_TX_FIFO_SERVICE_REQ     0x00000001
 
+#define        V4L2_DEVICE_NOTIFY_EVENT                _IOW('v', 2, struct v4l2_event)
+
 struct v4l2_device;
 struct v4l2_ctrl_handler;
 struct v4l2_event_subscription;