#define to_video_device(cd) container_of(cd, struct video_device, class_dev)
static inline int __must_check
video_device_create_file(struct video_device *vfd,
#define to_video_device(cd) container_of(cd, struct video_device, class_dev)
static inline int __must_check
video_device_create_file(struct video_device *vfd,
extern int video_exclusive_open(struct inode *inode, struct file *file);
extern int video_exclusive_release(struct inode *inode, struct file *file);
extern int video_exclusive_open(struct inode *inode, struct file *file);
extern int video_exclusive_release(struct inode *inode, struct file *file);