include/media/v4l2-dev.h

#ifndef _V4L2_DEV_H
#define _V4L2_DEV_H

#include <linux/poll.h>
#include <linux/fs.h>
#include <linux/device.h>
#include <linux/cdev.h>
#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_SUBDEV		3
#define VFL_TYPE_MAX		4

struct v4l2_ioctl_callbacks;
struct video_device;
struct v4l2_device;
struct v4l2_ctrl_handler;

#define V4L2_FL_REGISTERED	(0)
#define V4L2_FL_USES_V4L2_FH	(1)
#define V4L2_FL_USE_FH_PRIO	(2)


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;
	ssize_t (*read) (struct file *, char __user *, size_t, loff_t *);
	ssize_t (*write) (struct file *, const char __user *, size_t, loff_t *);
	unsigned int (*poll) (struct file *, struct poll_table_struct *);
	long (*ioctl) (struct file *, unsigned int, unsigned long);
	long (*unlocked_ioctl) (struct file *, unsigned int, unsigned long);
	unsigned long (*get_unmapped_area) (struct file *, unsigned long,
				unsigned long, unsigned long, unsigned long);
	int (*mmap) (struct file *, struct vm_area_struct *);
	int (*open) (struct file *);
	int (*release) (struct file *);
};


struct video_device
{
#if defined(CONFIG_MEDIA_CONTROLLER)
	struct media_entity entity;
#endif
	
	const struct v4l2_file_operations *fops;

	
	struct device dev;		
	struct cdev *cdev;		

	
	struct device *parent;		
	struct v4l2_device *v4l2_dev;	

	
	struct v4l2_ctrl_handler *ctrl_handler;

	
	struct v4l2_prio_state *prio;

	
	char name[32];
	int vfl_type;
	
	int minor;
	u16 num;
	
	unsigned long flags;
	
	int index;

	
	spinlock_t		fh_lock; 
	struct list_head	fh_list; 

	int debug;			

	
	v4l2_std_id tvnorms;		
	v4l2_std_id current_norm;	

	
	void (*release)(struct video_device *vdev);

	
	const struct v4l2_ioctl_ops *ioctl_ops;

	
	struct mutex *lock;
};

#define media_entity_to_video_device(__e) \
	container_of(__e, struct video_device, entity)
#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);

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);
}

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);
}

void video_unregister_device(struct video_device *vdev);

struct video_device * __must_check video_device_alloc(void);

void video_device_release(struct video_device *vdev);

void video_device_release_empty(struct video_device *vdev);

static inline void *video_get_drvdata(struct video_device *vdev)
{
	return dev_get_drvdata(&vdev->dev);
}

static inline void video_set_drvdata(struct video_device *vdev, void *data)
{
	dev_set_drvdata(&vdev->dev, data);
}

struct video_device *video_devdata(struct file *file);

static inline void *video_drvdata(struct file *file)
{
	return video_get_drvdata(video_devdata(file));
}

static inline const char *video_device_node_name(struct video_device *vdev)
{
	return dev_name(&vdev->dev);
}

static inline int video_is_registered(struct video_device *vdev)
{
	return test_bit(V4L2_FL_REGISTERED, &vdev->flags);
}

#endif