120 lines
3.3 KiB
C
120 lines
3.3 KiB
C
/*
|
|
*
|
|
* V 4 L 2 D R I V E R H E L P E R A P I
|
|
*
|
|
* Moved from videodev2.h
|
|
*
|
|
* Some commonly needed functions for drivers (v4l2-common.o module)
|
|
*/
|
|
#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>
|
|
|
|
#define VIDEO_MAJOR 81
|
|
|
|
/* Minor device allocation */
|
|
#define MINOR_VFL_TYPE_GRABBER_MIN 0
|
|
#define MINOR_VFL_TYPE_GRABBER_MAX 63
|
|
#define MINOR_VFL_TYPE_RADIO_MIN 64
|
|
#define MINOR_VFL_TYPE_RADIO_MAX 127
|
|
#define MINOR_VFL_TYPE_VTX_MIN 192
|
|
#define MINOR_VFL_TYPE_VTX_MAX 223
|
|
#define MINOR_VFL_TYPE_VBI_MIN 224
|
|
#define MINOR_VFL_TYPE_VBI_MAX 255
|
|
|
|
#define VFL_TYPE_GRABBER 0
|
|
#define VFL_TYPE_VBI 1
|
|
#define VFL_TYPE_RADIO 2
|
|
#define VFL_TYPE_VTX 3
|
|
|
|
struct v4l2_ioctl_callbacks;
|
|
|
|
/*
|
|
* Newer version of video_device, handled by videodev2.c
|
|
* This version moves redundant code from video device code to
|
|
* the common handler
|
|
*/
|
|
|
|
struct video_device
|
|
{
|
|
/* device ops */
|
|
const struct file_operations *fops;
|
|
|
|
/* sysfs */
|
|
struct device dev; /* v4l device */
|
|
struct cdev cdev; /* character device */
|
|
void (*cdev_release)(struct kobject *kobj);
|
|
struct device *parent; /* device parent */
|
|
|
|
/* device info */
|
|
char name[32];
|
|
int vfl_type;
|
|
int minor;
|
|
/* attribute to differentiate multiple indices on one physical device */
|
|
int index;
|
|
|
|
int debug; /* Activates debug level*/
|
|
|
|
/* Video standard vars */
|
|
v4l2_std_id tvnorms; /* Supported tv norms */
|
|
v4l2_std_id current_norm; /* Current tvnorm */
|
|
|
|
/* callbacks */
|
|
void (*release)(struct video_device *vfd);
|
|
|
|
/* ioctl callbacks */
|
|
const struct v4l2_ioctl_ops *ioctl_ops;
|
|
};
|
|
|
|
/* dev to video-device */
|
|
#define to_video_device(cd) container_of(cd, struct video_device, dev)
|
|
|
|
/* Register and unregister 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 *vfd, int type, int nr);
|
|
int __must_check video_register_device_index(struct video_device *vfd,
|
|
int type, int nr, int index);
|
|
void video_unregister_device(struct video_device *vfd);
|
|
|
|
/* helper functions to alloc/release struct video_device, the
|
|
latter can also be used for video_device->release(). */
|
|
struct video_device * __must_check video_device_alloc(void);
|
|
|
|
/* this release function frees the vfd pointer */
|
|
void video_device_release(struct video_device *vfd);
|
|
|
|
/* this release function does nothing, use when the video_device is a
|
|
static global struct. Note that having a static video_device is
|
|
a dubious construction at best. */
|
|
void video_device_release_empty(struct video_device *vfd);
|
|
|
|
/* helper functions to access driver private data. */
|
|
static inline void *video_get_drvdata(struct video_device *dev)
|
|
{
|
|
return dev_get_drvdata(&dev->dev);
|
|
}
|
|
|
|
static inline void video_set_drvdata(struct video_device *dev, void *data)
|
|
{
|
|
dev_set_drvdata(&dev->dev, data);
|
|
}
|
|
|
|
struct video_device *video_devdata(struct file *file);
|
|
|
|
/* Combine video_get_drvdata and video_devdata as this is
|
|
used very often. */
|
|
static inline void *video_drvdata(struct file *file)
|
|
{
|
|
return video_get_drvdata(video_devdata(file));
|
|
}
|
|
|
|
#endif /* _V4L2_DEV_H */
|