diff --git a/include/media/v4l2-dev.h b/include/media/v4l2-dev.h
index d00b9d3..a5ecec6 100644
--- a/include/media/v4l2-dev.h
+++ b/include/media/v4l2-dev.h
@@ -126,6 +126,7 @@
 
 	/* ioctl callbacks */
 	const struct v4l2_ioctl_ops *ioctl_ops;
+	DECLARE_BITMAP(valid_ioctls, BASE_VIDIOC_PRIVATE);
 
 	/* serialization lock */
 	DECLARE_BITMAP(dont_use_lock, BASE_VIDIOC_PRIVATE);
@@ -184,6 +185,16 @@
 		set_bit(_IOC_NR(cmd), vdev->dont_use_lock);
 }
 
+/* Mark that this command isn't implemented, must be called before
+   video_device_register. See also the comments in determine_valid_ioctls().
+   This function allows drivers to provide just one v4l2_ioctl_ops struct, but
+   disable ioctls based on the specific card that is actually found. */
+static inline void v4l2_dont_use_cmd(struct video_device *vdev, unsigned int cmd)
+{
+	if (_IOC_NR(cmd) < BASE_VIDIOC_PRIVATE)
+		set_bit(_IOC_NR(cmd), vdev->valid_ioctls);
+}
+
 /* helper functions to access driver private data. */
 static inline void *video_get_drvdata(struct video_device *vdev)
 {