1 files changed, 45 insertions, 3 deletions

diff --git a/include/media/v4l2-dev.h b/include/media/v4l2-dev.h
index 1efcacbed01a..c7c40f1d2624 100644
--- a/include/media/v4l2-dev.h
+++ b/include/media/v4l2-dev.h
@@ -16,12 +16,14 @@
 #include <linux/mutex.h>
 #include <linux/videodev2.h>
 
+#include <media/media-entity.h>
+
 #define VIDEO_MAJOR     81
 
 #define VFL_TYPE_GRABBER        0
 #define VFL_TYPE_VBI            1
 #define VFL_TYPE_RADIO          2
-#define VFL_TYPE_VTX            3
+#define VFL_TYPE_SUBDEV         3
 #define VFL_TYPE_MAX            4
 
 struct v4l2_ioctl_callbacks;
@@ -33,7 +35,25 @@ struct v4l2_ctrl_handler;
    Drivers can clear this flag if they want to block all future
    device access. It is cleared by video_unregister_device. */
 #define V4L2_FL_REGISTERED      (0)
+/* file->private_data points to struct v4l2_fh */
 #define V4L2_FL_USES_V4L2_FH    (1)
+/* Use the prio field of v4l2_fh for core priority checking */
+#define V4L2_FL_USE_FH_PRIO     (2)
+
+/* Priority helper functions */
+
+struct v4l2_prio_state {
+        atomic_t prios[4];
+};
+
+void v4l2_prio_init(struct v4l2_prio_state *global);
+int v4l2_prio_change(struct v4l2_prio_state *global, enum v4l2_priority *local,
+                     enum v4l2_priority new);
+void v4l2_prio_open(struct v4l2_prio_state *global, enum v4l2_priority *local);
+void v4l2_prio_close(struct v4l2_prio_state *global, enum v4l2_priority local);
+enum v4l2_priority v4l2_prio_max(struct v4l2_prio_state *global);
+int v4l2_prio_check(struct v4l2_prio_state *global, enum v4l2_priority local);
+
 
 struct v4l2_file_operations {
         struct module *owner;
@@ -57,6 +77,9 @@ struct v4l2_file_operations {
 
 struct video_device
 {
+#if defined(CONFIG_MEDIA_CONTROLLER)
+        struct media_entity entity;
+#endif
         /* device ops */
         const struct v4l2_file_operations *fops;
 
@@ -71,6 +94,9 @@ struct video_device
         /* Control handler associated with this device node. May be NULL. */
         struct v4l2_ctrl_handler *ctrl_handler;
 
+        /* Priority state. If NULL, then v4l2_dev->prio will be used. */
+        struct v4l2_prio_state *prio;
+
         /* device info */
         char name[32];
         int vfl_type;
@@ -97,20 +123,36 @@ struct video_device
 
         /* ioctl callbacks */
         const struct v4l2_ioctl_ops *ioctl_ops;
+
+        /* serialization lock */
+        struct mutex *lock;
 };
 
+#define media_entity_to_video_device(__e) \
+        container_of(__e, struct video_device, entity)
 /* dev to video-device */
 #define to_video_device(cd) container_of(cd, struct video_device, dev)
 
+int __must_check __video_register_device(struct video_device *vdev, int type,
+                int nr, int warn_if_nr_in_use, struct module *owner);
+
 /* Register video devices. Note that if video_register_device fails,
    the release() callback of the video_device structure is *not* called, so
    the caller is responsible for freeing any data. Usually that means that
    you call video_device_release() on failure. */
-int __must_check video_register_device(struct video_device *vdev, int type, int nr);
+static inline int __must_check video_register_device(struct video_device *vdev,
+                int type, int nr)
+{
+        return __video_register_device(vdev, type, nr, 1, vdev->fops->owner);
+}
 
 /* Same as video_register_device, but no warning is issued if the desired
    device node number was already in use. */
-int __must_check video_register_device_no_warn(struct video_device *vdev, int type, int nr);
+static inline int __must_check video_register_device_no_warn(
+                struct video_device *vdev, int type, int nr)
+{
+        return __video_register_device(vdev, type, nr, 0, vdev->fops->owner);
+}
 
 /* Unregister video devices. Will do nothing if vdev == NULL or
    video_is_registered() returns false. */