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[RFC/PATCH v2 1/6] v4l: subdev: Generic ioctl support

Instead of returning an error when receiving an ioctl call with an
unsupported command, forward the call to the subdev core::ioctl handler.

Signed-off-by: Laurent Pinchart <laurent.pinchart@xxxxxxxxxxxxxxxx>
 Documentation/video4linux/v4l2-framework.txt |    5 +++++
 drivers/media/video/v4l2-subdev.c            |    2 +-
 2 files changed, 6 insertions(+), 1 deletions(-)

diff --git a/Documentation/video4linux/v4l2-framework.txt b/Documentation/video4linux/v4l2-framework.txt
index 3416d93..21bb837 100644
--- a/Documentation/video4linux/v4l2-framework.txt
+++ b/Documentation/video4linux/v4l2-framework.txt
@@ -402,6 +402,11 @@ VIDIOC_UNSUBSCRIBE_EVENT
 	To properly support events, the poll() file operation is also
+Private ioctls
+	All ioctls not in the above list are passed directly to the sub-device
+	driver through the core::ioctl operation.
 I2C sub-device drivers
diff --git a/drivers/media/video/v4l2-subdev.c b/drivers/media/video/v4l2-subdev.c
index a37b537..096644d 100644
--- a/drivers/media/video/v4l2-subdev.c
+++ b/drivers/media/video/v4l2-subdev.c
@@ -258,7 +258,7 @@ static long subdev_do_ioctl(struct file *file, unsigned int cmd, void *arg)
-		return -ENOIOCTLCMD;
+		return v4l2_subdev_call(sd, core, ioctl, cmd, arg);
 	return 0;

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