videodev.h

这是一个市场上常见电视卡的驱动程序源代码

#ifndef __LINUX_VIDEODEV_H
#define __LINUX_VIDEODEV_H

#include <linux/types.h>
#include <linux/version.h>

#define HAVE_V4L2 1
#include <linux/videodev2.h>

#ifdef __KERNEL__

#include <linux/poll.h>
#include <linux/mm.h>
#if LINUX_VERSION_CODE < KERNEL_VERSION(2,5,69)
#include <linux/devfs_fs_kernel.h>
#endif
#if LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0)
#include <linux/device.h>
#endif

struct video_device
{
	/* device info */
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,0)
	struct device *dev;
#endif
	char name[32];
	int type;       /* v4l1 */
	int type2;      /* v4l2 */
	int hardware;
	int minor;

	/* device ops + callbacks */
	struct file_operations *fops;
	void (*release)(struct video_device *vfd);

#if LINUX_VERSION_CODE < KERNEL_VERSION(2,5,0)
	/* old, obsolete interface -- dropped in 2.5.x, don't use it */
	int (*open)(struct video_device *, int mode);
	void (*close)(struct video_device *);
	long (*read)(struct video_device *, char *, unsigned long, int noblock);
	long (*write)(struct video_device *, const char *, unsigned long, int noblock);
	unsigned int (*poll)(struct video_device *, struct file *, poll_table *);
	int (*ioctl)(struct video_device *, unsigned int , void *);
	int (*mmap)(struct video_device *, const char *, unsigned long);
	int (*initialize)(struct video_device *);       
#endif

#if 1 /* to be removed in 2.7.x */
	/* obsolete -- fops->owner is used instead */
	struct module *owner;
	/* dev->driver_data will be used instead some day.
	 * Use the video_{get|set}_drvdata() helper functions,
	 * so the switch over will be transparent for you.
	 * Or use {pci|usb}_{get|set}_drvdata() directly. */
	void *priv;
#endif

	/* for videodev.c intenal usage -- please don't touch */
	int users;                     /* video_exclusive_{open|close} ... */
	struct semaphore lock;         /* ... helper function uses these   */
#if LINUX_VERSION_CODE < KERNEL_VERSION(2,5,69)
	devfs_handle_t devfs_handle;   /* devfs */
#else
	char devfs_name[64];           /* devfs */
#endif
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,0)
	struct class_device class_dev; /* sysfs */
#endif
};

#define VIDEO_MAJOR	81

#define VFL_TYPE_GRABBER	0
#define VFL_TYPE_VBI		1
#define VFL_TYPE_RADIO		2
#define VFL_TYPE_VTX		3

extern int video_register_device(struct video_device *, int type, int nr);
extern void video_unregister_device(struct video_device *);
extern struct video_device* video_devdata(struct file*);

#if LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0)
#define to_video_device(cd) container_of(cd, struct video_device, class_dev)
static inline void
video_device_create_file(struct video_device *vfd,
			 struct class_device_attribute *attr)
{
	class_device_create_file(&vfd->class_dev, attr);
}
static inline void
video_device_remove_file(struct video_device *vfd,
			 struct class_device_attribute *attr)
{
	class_device_remove_file(&vfd->class_dev, attr);
}
#endif

/* helper functions to alloc / release struct video_device, the
   later can be used for video_device->release() */
struct video_device *video_device_alloc(void);
void video_device_release(struct video_device *vfd);

/* helper functions to access driver private data. */
static inline void *video_get_drvdata(struct video_device *dev)
{
	return dev->priv;
}

static inline void video_set_drvdata(struct video_device *dev, void *data)
{
	dev->priv = data;
}

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_usercopy(struct inode *inode, struct file *file,
			  unsigned int cmd, unsigned long arg,
			  int (*func)(struct inode *inode, struct file *file,
				      unsigned int cmd, void *arg));
#endif /* __KERNEL__ */

#define VID_TYPE_CAPTURE	1	/* Can capture */
#define VID_TYPE_TUNER		2	/* Can tune */
#define VID_TYPE_TELETEXT	4	/* Does teletext */
#define VID_TYPE_OVERLAY	8	/* Overlay onto frame buffer */
#define VID_TYPE_CHROMAKEY	16	/* Overlay by chromakey */
#define VID_TYPE_CLIPPING	32	/* Can clip */
#define VID_TYPE_FRAMERAM	64	/* Uses the frame buffer memory */
#define VID_TYPE_SCALES		128	/* Scalable */
#define VID_TYPE_MONOCHROME	256	/* Monochrome only */
#define VID_TYPE_SUBCAPTURE	512	/* Can capture subareas of the image */
#define VID_TYPE_MPEG_DECODER	1024	/* Can decode MPEG streams */
#define VID_TYPE_MPEG_ENCODER	2048	/* Can encode MPEG streams */
#define VID_TYPE_MJPEG_DECODER	4096	/* Can decode MJPEG streams */
#define VID_TYPE_MJPEG_ENCODER	8192	/* Can encode MJPEG streams */

struct video_capability
{
	char name[32];
	int type;
	int channels;	/* Num channels */
	int audios;	/* Num audio devices */
	int maxwidth;	/* Supported width */
	int maxheight;	/* And height */
	int minwidth;	/* Supported width */
	int minheight;	/* And height */
};


struct video_channel
{
	int channel;
	char name[32];
	int tuners;
	__u32  flags;
#define VIDEO_VC_TUNER		1	/* Channel has a tuner */
#define VIDEO_VC_AUDIO		2	/* Channel has audio */
	__u16  type;
#define VIDEO_TYPE_TV		1
#define VIDEO_TYPE_CAMERA	2	
	__u16 norm;			/* Norm set by channel */
};

struct video_tuner
{
	int tuner;
	char name[32];
	unsigned long rangelow, rangehigh;	/* Tuner range */
	__u32 flags;
#define VIDEO_TUNER_PAL		1
#define VIDEO_TUNER_NTSC	2
#define VIDEO_TUNER_SECAM	4
#define VIDEO_TUNER_LOW		8	/* Uses KHz not MHz */
#define VIDEO_TUNER_NORM	16	/* Tuner can set norm */
#define VIDEO_TUNER_STEREO_ON	128	/* Tuner is seeing stereo */
#define VIDEO_TUNER_RDS_ON      256     /* Tuner is seeing an RDS datastream */
#define VIDEO_TUNER_MBS_ON      512     /* Tuner is seeing an MBS datastream */
	__u16 mode;			/* PAL/NTSC/SECAM/OTHER */
#define VIDEO_MODE_PAL		0
#define VIDEO_MODE_NTSC		1
#define VIDEO_MODE_SECAM	2
#define VIDEO_MODE_AUTO		3
	__u16 signal;			/* Signal strength 16bit scale */
};

struct video_picture
{
	__u16	brightness;
	__u16	hue;
	__u16	colour;
	__u16	contrast;
	__u16	whiteness;	/* Black and white only */
	__u16	depth;		/* Capture depth */
	__u16   palette;	/* Palette in use */
#define VIDEO_PALETTE_GREY	1	/* Linear greyscale */
#define VIDEO_PALETTE_HI240	2	/* High 240 cube (BT848) */
#define VIDEO_PALETTE_RGB565	3	/* 565 16 bit RGB */
#define VIDEO_PALETTE_RGB24	4	/* 24bit RGB */
#define VIDEO_PALETTE_RGB32	5	/* 32bit RGB */	
#define VIDEO_PALETTE_RGB555	6	/* 555 15bit RGB */
#define VIDEO_PALETTE_YUV422	7	/* YUV422 capture */
#define VIDEO_PALETTE_YUYV	8
#define VIDEO_PALETTE_UYVY	9	/* The great thing about standards is ... */
#define VIDEO_PALETTE_YUV420	10
#define VIDEO_PALETTE_YUV411	11	/* YUV411 capture */
#define VIDEO_PALETTE_RAW	12	/* RAW capture (BT848) */
#define VIDEO_PALETTE_YUV422P	13	/* YUV 4:2:2 Planar */
#define VIDEO_PALETTE_YUV411P	14	/* YUV 4:1:1 Planar */
#define VIDEO_PALETTE_YUV420P	15	/* YUV 4:2:0 Planar */
#define VIDEO_PALETTE_YUV410P	16	/* YUV 4:1:0 Planar */
#define VIDEO_PALETTE_PLANAR	13	/* start of planar entries */
#define VIDEO_PALETTE_COMPONENT 7	/* start of component entries */
};

struct video_audio
{
	int	audio;		/* Audio channel */
	__u16	volume;		/* If settable */
	__u16	bass, treble;
	__u32	flags;
#define VIDEO_AUDIO_MUTE	1
#define VIDEO_AUDIO_MUTABLE	2
#define VIDEO_AUDIO_VOLUME	4
#define VIDEO_AUDIO_BASS	8
#define VIDEO_AUDIO_TREBLE	16	
#define VIDEO_AUDIO_BALANCE	32
	char    name[16];
#define VIDEO_SOUND_MONO	1
#define VIDEO_SOUND_STEREO	2
#define VIDEO_SOUND_LANG1	4
#define VIDEO_SOUND_LANG2	8
        __u16   mode;