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| author | Jacopo Mondi <jacopo@jmondi.org> | 2020-05-07 17:12:50 +0200 |
|---|---|---|
| committer | Mauro Carvalho Chehab <mchehab+huawei@kernel.org> | 2020-05-12 17:04:07 +0200 |
| commit | f75c431e54e2e43c91fe267097b974ff2e5dc668 (patch) | |
| tree | e1b4a93f5831616dcda0c04dd4201a53e8e8e78e /include/media/v4l2-dev.h | |
| parent | 3fb0ee8b3b79ee9c8fb7769bdf802bffeae7e085 (diff) | |
| download | lwn-f75c431e54e2e43c91fe267097b974ff2e5dc668.tar.gz lwn-f75c431e54e2e43c91fe267097b974ff2e5dc668.zip | |
media: v4l2-dev: Add v4l2_device_register_ro_subdev_node()
Add to the V4L2 core a function to register device nodes for video
subdevices in read-only mode.
Registering a device node in read-only mode is useful to expose to
userspace the current sub-device configuration, without allowing
application to change it by using the V4L2 subdevice ioctls.
Acked-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Jacopo Mondi <jacopo@jmondi.org>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Diffstat (limited to 'include/media/v4l2-dev.h')
| -rw-r--r-- | include/media/v4l2-dev.h | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/include/media/v4l2-dev.h b/include/media/v4l2-dev.h index 4602c15ff878..ad2d41952442 100644 --- a/include/media/v4l2-dev.h +++ b/include/media/v4l2-dev.h @@ -82,11 +82,18 @@ struct v4l2_ctrl_handler; * but the old crop API will still work as expected in order to preserve * backwards compatibility. * Never set this flag for new drivers. + * @V4L2_FL_SUBDEV_RO_DEVNODE: + * indicates that the video device node is registered in read-only mode. + * The flag only applies to device nodes registered for sub-devices, it is + * set by the core when the sub-devices device nodes are registered with + * v4l2_device_register_ro_subdev_nodes() and used by the sub-device ioctl + * handler to restrict access to some ioctl calls. */ enum v4l2_video_device_flags { V4L2_FL_REGISTERED = 0, V4L2_FL_USES_V4L2_FH = 1, V4L2_FL_QUIRK_INVERTED_CROP = 2, + V4L2_FL_SUBDEV_RO_DEVNODE = 3, }; /* Priority helper functions */ |