[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>

2 files changed, 41 insertions, 0 deletions

diff --git a/Documentation/video4linux/v4l2-framework.txt b/Documentation/video4linux/v4l2-framework.txt
index 8b358710b2f7..1feecfc59c3d 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
 ----------------------
diff --git a/drivers/media/video/v4l2-subdev.c b/drivers/media/video/v4l2-subdev.c
index 460b33697c9b..da10430051c0 100644
--- a/drivers/media/video/v4l2-subdev.c
+++ b/drivers/media/video/v4l2-subdev.c
@@ -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;
         }