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authorSakari Ailus <sakari.ailus@iki.fi>2010-03-03 12:49:38 -0300
committerMauro Carvalho Chehab <mchehab@redhat.com>2011-03-21 20:32:42 -0300
commit02adb1cc765b8c29dc83c6602bda19003cce62f1 (patch)
tree067fd5a73251f6dc33567926c409a0b1070710ab /Documentation/video4linux
parentea8aa4349e11c62242a8908fc172de27d7a151d7 (diff)
[media] v4l: subdev: Events support
Provide v4l2_subdevs with v4l2_event support. Subdev drivers only need very little to support events. Signed-off-by: Sakari Ailus <sakari.ailus@iki.fi> Signed-off-by: David Cohen <dacohen@gmail.com> Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Acked-by: Hans Verkuil <hverkuil@xs4all.nl> Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
Diffstat (limited to 'Documentation/video4linux')
-rw-r--r--Documentation/video4linux/v4l2-framework.txt18
1 files changed, 18 insertions, 0 deletions
diff --git a/Documentation/video4linux/v4l2-framework.txt b/Documentation/video4linux/v4l2-framework.txt
index 1feecfc59c3..eb8479565dc 100644
--- a/Documentation/video4linux/v4l2-framework.txt
+++ b/Documentation/video4linux/v4l2-framework.txt
@@ -350,6 +350,24 @@ VIDIOC_TRY_EXT_CTRLS
controls can be also be accessed through one (or several) V4L2 device
nodes.
+VIDIOC_DQEVENT
+VIDIOC_SUBSCRIBE_EVENT
+VIDIOC_UNSUBSCRIBE_EVENT
+
+ The events ioctls are identical to the ones defined in V4L2. They
+ behave identically, with the only exception that they deal only with
+ events generated by the sub-device. Depending on the driver, those
+ events can also be reported by one (or several) V4L2 device nodes.
+
+ Sub-device drivers that want to use events need to set the
+ V4L2_SUBDEV_USES_EVENTS v4l2_subdev::flags and initialize
+ v4l2_subdev::nevents to events queue depth before registering the
+ sub-device. After registration events can be queued as usual on the
+ v4l2_subdev::devnode device node.
+
+ To properly support events, the poll() file operation is also
+ implemented.
+
I2C sub-device drivers
----------------------