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[media] v4l: subdev: Add device node support

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Create a device node named subdevX for every registered subdev.

As the device node is registered before the subdev core::s_config
function is called, return -EGAIN on open until initialization
completes.

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Vimarsh Zutshi <vimarsh.zutshi@gmail.com>
Acked-by: Hans Verkuil <hverkuil@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
This commit is contained in:
Laurent Pinchart 2009-12-09 08:38:49 -03:00 • committed by Mauro Carvalho Chehab
parent 0070d91e5b
commit 2096a5dcf9
8 changed files with 158 additions and 22 deletions
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16
Documentation/video4linux/v4l2-framework.txt
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@ -319,6 +319,22 @@ controlled through GPIO pins. This distinction is only relevant when setting
up the device, but once the subdev is registered it is completely transparent.
V4L2 sub-device userspace API
-----------------------------
Beside exposing a kernel API through the v4l2_subdev_ops structure, V4L2
sub-devices can also be controlled directly by userspace applications.
Device nodes named v4l-subdevX can be created in /dev to access sub-devices
directly. If a sub-device supports direct userspace configuration it must set
the V4L2_SUBDEV_FL_HAS_DEVNODE flag before being registered.
After registering sub-devices, the v4l2_device driver can create device nodes
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.
I2C sub-device drivers
----------------------