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authorLaurent Pinchart <laurent.pinchart@ideasonboard.com>2009-12-09 08:39:54 -0300
committerMauro Carvalho Chehab <mchehab@redhat.com>2011-03-21 20:32:42 -0300
commitea8aa4349e11c62242a8908fc172de27d7a151d7 (patch)
treeb079fb17ea30defa24b394daac41679074a5a690 /Documentation/video4linux
parent3dd5ee0801ee10e5632b40fd8d0495417b32910a (diff)
[media] v4l: subdev: Control ioctls support
Pass the control-related ioctls to the subdev driver through the control framework. 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.txt16
1 files changed, 16 insertions, 0 deletions
diff --git a/Documentation/video4linux/v4l2-framework.txt b/Documentation/video4linux/v4l2-framework.txt
index 8b358710b2f..1feecfc59c3 100644
--- a/Documentation/video4linux/v4l2-framework.txt
+++ b/Documentation/video4linux/v4l2-framework.txt
@@ -334,6 +334,22 @@ for all registered sub-devices marked with V4L2_SUBDEV_FL_HAS_DEVNODE by calling
v4l2_device_register_subdev_nodes(). Those device nodes will be automatically
removed when sub-devices are unregistered.
+The device node handles a subset of the V4L2 API.
+
+VIDIOC_QUERYCTRL
+VIDIOC_QUERYMENU
+VIDIOC_G_CTRL
+VIDIOC_S_CTRL
+VIDIOC_G_EXT_CTRLS
+VIDIOC_S_EXT_CTRLS
+VIDIOC_TRY_EXT_CTRLS
+
+ The controls ioctls are identical to the ones defined in V4L2. They
+ behave identically, with the only exception that they deal only with
+ controls implemented in the sub-device. Depending on the driver, those
+ controls can be also be accessed through one (or several) V4L2 device
+ nodes.
+
I2C sub-device drivers
----------------------