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Commit ea8aa434 authored by Laurent Pinchart's avatar Laurent Pinchart Committed by Mauro Carvalho Chehab
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[media] v4l: subdev: Control ioctls support 



Pass the control-related ioctls to the subdev driver through the control
framework.

Signed-off-by: default avatarLaurent Pinchart <laurent.pinchart@ideasonboard.com>
Acked-by: default avatarHans Verkuil <hverkuil@xs4all.nl>
Signed-off-by: default avatarMauro Carvalho Chehab <mchehab@redhat.com>
parent 3dd5ee08

Documentation/video4linux/v4l2-framework.txt

+16 −0
Original line number Diff line number Diff line
@@ -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

----------------------

drivers/media/video/v4l2-subdev.c

+25 −0
Original line number Diff line number Diff line
@@ -24,6 +24,7 @@ 
#include <linux/ioctl.h>

#include <linux/videodev2.h>



#include <media/v4l2-ctrls.h>

#include <media/v4l2-device.h>

#include <media/v4l2-ioctl.h>
@@ -39,7 +40,31 @@ static int subdev_close(struct file *file) 


static long subdev_do_ioctl(struct file *file, unsigned int cmd, void *arg)

{

	struct video_device *vdev = video_devdata(file);

	struct v4l2_subdev *sd = vdev_to_v4l2_subdev(vdev);



	switch (cmd) {

	case VIDIOC_QUERYCTRL:

		return v4l2_subdev_queryctrl(sd, arg);



	case VIDIOC_QUERYMENU:

		return v4l2_subdev_querymenu(sd, arg);



	case VIDIOC_G_CTRL:

		return v4l2_subdev_g_ctrl(sd, arg);



	case VIDIOC_S_CTRL:

		return v4l2_subdev_s_ctrl(sd, arg);



	case VIDIOC_G_EXT_CTRLS:

		return v4l2_subdev_g_ext_ctrls(sd, arg);



	case VIDIOC_S_EXT_CTRLS:

		return v4l2_subdev_s_ext_ctrls(sd, arg);



	case VIDIOC_TRY_EXT_CTRLS:

		return v4l2_subdev_try_ext_ctrls(sd, arg);



	default:

		return -ENOIOCTLCMD;

	}