3 files changed, 46 insertions, 15 deletions

diff --git a/drivers/media/video/v4l2-dev.c b/drivers/media/video/v4l2-dev.c
index 9e89bf617790..21ffd030611e 100644
--- a/drivers/media/video/v4l2-dev.c
+++ b/drivers/media/video/v4l2-dev.c
@@ -447,8 +447,12 @@ static int __video_register_device(struct video_device *vdev, int type, int nr,
 
         vdev->vfl_type = type;
         vdev->cdev = NULL;
-        if (vdev->v4l2_dev && vdev->v4l2_dev->dev)
-                vdev->parent = vdev->v4l2_dev->dev;
+        if (vdev->v4l2_dev) {
+                if (vdev->v4l2_dev->dev)
+                        vdev->parent = vdev->v4l2_dev->dev;
+                if (vdev->ctrl_handler == NULL)
+                        vdev->ctrl_handler = vdev->v4l2_dev->ctrl_handler;
+        }
 
         /* Part 2: find a free minor, device node number and device index. */
 #ifdef CONFIG_VIDEO_FIXED_MINOR_RANGES
diff --git a/drivers/media/video/v4l2-device.c b/drivers/media/video/v4l2-device.c
index 5a7dc4afe92a..0b08f96b74a5 100644
--- a/drivers/media/video/v4l2-device.c
+++ b/drivers/media/video/v4l2-device.c
@@ -26,6 +26,7 @@
 #endif
 #include <linux/videodev2.h>
 #include <media/v4l2-device.h>
+#include <media/v4l2-ctrls.h>
 
 int v4l2_device_register(struct device *dev, struct v4l2_device *v4l2_dev)
 {
@@ -115,6 +116,8 @@ EXPORT_SYMBOL_GPL(v4l2_device_unregister);
 int v4l2_device_register_subdev(struct v4l2_device *v4l2_dev,
                                                 struct v4l2_subdev *sd)
 {
+        int err;
+
         /* Check for valid input */
         if (v4l2_dev == NULL || sd == NULL || !sd->name[0])
                 return -EINVAL;
@@ -122,6 +125,10 @@ int v4l2_device_register_subdev(struct v4l2_device *v4l2_dev,
         WARN_ON(sd->v4l2_dev != NULL);
         if (!try_module_get(sd->owner))
                 return -ENODEV;
+        /* This just returns 0 if either of the two args is NULL */
+        err = v4l2_ctrl_add_handler(v4l2_dev->ctrl_handler, sd->ctrl_handler);
+        if (err)
+                return err;
         sd->v4l2_dev = v4l2_dev;
         spin_lock(&v4l2_dev->lock);
         list_add_tail(&sd->list, &v4l2_dev->subdevs);
diff --git a/drivers/media/video/v4l2-ioctl.c b/drivers/media/video/v4l2-ioctl.c
index 0eeceae50329..dd9283fcb564 100644
--- a/drivers/media/video/v4l2-ioctl.c
+++ b/drivers/media/video/v4l2-ioctl.c
@@ -26,6 +26,7 @@
 #endif
 #include <media/v4l2-common.h>
 #include <media/v4l2-ioctl.h>
+#include <media/v4l2-ctrls.h>
 #include <media/v4l2-fh.h>
 #include <media/v4l2-event.h>
 #include <media/v4l2-chip-ident.h>
@@ -1259,9 +1260,12 @@ static long __video_do_ioctl(struct file *file,
         {
                 struct v4l2_queryctrl *p = arg;
 
-                if (!ops->vidioc_queryctrl)
+                if (vfd->ctrl_handler)
+                        ret = v4l2_queryctrl(vfd->ctrl_handler, p);
+                else if (ops->vidioc_queryctrl)
+                        ret = ops->vidioc_queryctrl(file, fh, p);
+                else
                         break;
-                ret = ops->vidioc_queryctrl(file, fh, p);
                 if (!ret)
                         dbgarg(cmd, "id=0x%x, type=%d, name=%s, min/max=%d/%d, "
                                         "step=%d, default=%d, flags=0x%08x\n",
@@ -1276,7 +1280,9 @@ static long __video_do_ioctl(struct file *file,
         {
                 struct v4l2_control *p = arg;
 
-                if (ops->vidioc_g_ctrl)
+                if (vfd->ctrl_handler)
+                        ret = v4l2_g_ctrl(vfd->ctrl_handler, p);
+                else if (ops->vidioc_g_ctrl)
                         ret = ops->vidioc_g_ctrl(file, fh, p);
                 else if (ops->vidioc_g_ext_ctrls) {
                         struct v4l2_ext_controls ctrls;
@@ -1306,11 +1312,16 @@ static long __video_do_ioctl(struct file *file,
                 struct v4l2_ext_controls ctrls;
                 struct v4l2_ext_control ctrl;
 
-                if (!ops->vidioc_s_ctrl && !ops->vidioc_s_ext_ctrls)
+                if (!vfd->ctrl_handler &&
+                        !ops->vidioc_s_ctrl && !ops->vidioc_s_ext_ctrls)
                         break;
 
                 dbgarg(cmd, "id=0x%x, value=%d\n", p->id, p->value);
 
+                if (vfd->ctrl_handler) {
+                        ret = v4l2_s_ctrl(vfd->ctrl_handler, p);
+                        break;
+                }
                 if (ops->vidioc_s_ctrl) {
                         ret = ops->vidioc_s_ctrl(file, fh, p);
                         break;
@@ -1332,10 +1343,12 @@ static long __video_do_ioctl(struct file *file,
                 struct v4l2_ext_controls *p = arg;
 
                 p->error_idx = p->count;
-                if (!ops->vidioc_g_ext_ctrls)
-                        break;
-                if (check_ext_ctrls(p, 0))
+                if (vfd->ctrl_handler)
+                        ret = v4l2_g_ext_ctrls(vfd->ctrl_handler, p);
+                else if (ops->vidioc_g_ext_ctrls && check_ext_ctrls(p, 0))
                         ret = ops->vidioc_g_ext_ctrls(file, fh, p);
+                else
+                        break;
                 v4l_print_ext_ctrls(cmd, vfd, p, !ret);
                 break;
         }
@@ -1344,10 +1357,12 @@ static long __video_do_ioctl(struct file *file,
                 struct v4l2_ext_controls *p = arg;
 
                 p->error_idx = p->count;
-                if (!ops->vidioc_s_ext_ctrls)
+                if (!vfd->ctrl_handler && !ops->vidioc_s_ext_ctrls)
                         break;
                 v4l_print_ext_ctrls(cmd, vfd, p, 1);
-                if (check_ext_ctrls(p, 0))
+                if (vfd->ctrl_handler)
+                        ret = v4l2_s_ext_ctrls(vfd->ctrl_handler, p);
+                else if (check_ext_ctrls(p, 0))
                         ret = ops->vidioc_s_ext_ctrls(file, fh, p);
                 break;
         }
@@ -1356,10 +1371,12 @@ static long __video_do_ioctl(struct file *file,
                 struct v4l2_ext_controls *p = arg;
 
                 p->error_idx = p->count;
-                if (!ops->vidioc_try_ext_ctrls)
+                if (!vfd->ctrl_handler && !ops->vidioc_try_ext_ctrls)
                         break;
                 v4l_print_ext_ctrls(cmd, vfd, p, 1);
-                if (check_ext_ctrls(p, 0))
+                if (vfd->ctrl_handler)
+                        ret = v4l2_try_ext_ctrls(vfd->ctrl_handler, p);
+                else if (check_ext_ctrls(p, 0))
                         ret = ops->vidioc_try_ext_ctrls(file, fh, p);
                 break;
         }
@@ -1367,9 +1384,12 @@ static long __video_do_ioctl(struct file *file,
         {
                 struct v4l2_querymenu *p = arg;
 
-                if (!ops->vidioc_querymenu)
+                if (vfd->ctrl_handler)
+                        ret = v4l2_querymenu(vfd->ctrl_handler, p);
+                else if (ops->vidioc_querymenu)
+                        ret = ops->vidioc_querymenu(file, fh, p);
+                else
                         break;
-                ret = ops->vidioc_querymenu(file, fh, p);
                 if (!ret)
                         dbgarg(cmd, "id=0x%x, index=%d, name=%s\n",
                                 p->id, p->index, p->name);