3 * V 4 L 2 D R I V E R H E L P E R A P I
5 * Moved from videodev2.h
7 * Some commonly needed functions for drivers (v4l2-common.o module)
12 #include <linux/poll.h>
14 #include <linux/device.h>
15 #include <linux/cdev.h>
16 #include <linux/mutex.h>
17 #include <linux/videodev2.h>
19 #define VIDEO_MAJOR 81
21 /* Minor device allocation */
22 #define MINOR_VFL_TYPE_GRABBER_MIN 0
23 #define MINOR_VFL_TYPE_GRABBER_MAX 63
24 #define MINOR_VFL_TYPE_RADIO_MIN 64
25 #define MINOR_VFL_TYPE_RADIO_MAX 127
26 #define MINOR_VFL_TYPE_VTX_MIN 192
27 #define MINOR_VFL_TYPE_VTX_MAX 223
28 #define MINOR_VFL_TYPE_VBI_MIN 224
29 #define MINOR_VFL_TYPE_VBI_MAX 255
31 #define VFL_TYPE_GRABBER 0
32 #define VFL_TYPE_VBI 1
33 #define VFL_TYPE_RADIO 2
34 #define VFL_TYPE_VTX 3
36 struct v4l2_ioctl_callbacks;
39 * Newer version of video_device, handled by videodev2.c
40 * This version moves redundant code from video device code to
47 const struct file_operations *fops;
50 struct device dev; /* v4l device */
51 struct cdev cdev; /* character device */
52 void (*cdev_release)(struct kobject *kobj);
53 struct device *parent; /* device parent */
59 /* attribute to differentiate multiple indices on one physical device */
62 int debug; /* Activates debug level*/
64 /* Video standard vars */
65 v4l2_std_id tvnorms; /* Supported tv norms */
66 v4l2_std_id current_norm; /* Current tvnorm */
69 void (*release)(struct video_device *vfd);
72 const struct v4l2_ioctl_ops *ioctl_ops;
75 /* dev to video-device */
76 #define to_video_device(cd) container_of(cd, struct video_device, dev)
78 /* Register and unregister devices. Note that if video_register_device fails,
79 the release() callback of the video_device structure is *not* called, so
80 the caller is responsible for freeing any data. Usually that means that
81 you call video_device_release() on failure. */
82 int __must_check video_register_device(struct video_device *vfd, int type, int nr);
83 int __must_check video_register_device_index(struct video_device *vfd,
84 int type, int nr, int index);
85 void video_unregister_device(struct video_device *vfd);
87 /* helper functions to alloc/release struct video_device, the
88 latter can also be used for video_device->release(). */
89 struct video_device * __must_check video_device_alloc(void);
91 /* this release function frees the vfd pointer */
92 void video_device_release(struct video_device *vfd);
94 /* this release function does nothing, use when the video_device is a
95 static global struct. Note that having a static video_device is
96 a dubious construction at best. */
97 void video_device_release_empty(struct video_device *vfd);
99 /* helper functions to access driver private data. */
100 static inline void *video_get_drvdata(struct video_device *dev)
102 return dev_get_drvdata(&dev->dev);
105 static inline void video_set_drvdata(struct video_device *dev, void *data)
107 dev_set_drvdata(&dev->dev, data);
110 struct video_device *video_devdata(struct file *file);
112 /* Combine video_get_drvdata and video_devdata as this is
114 static inline void *video_drvdata(struct file *file)
116 return video_get_drvdata(video_devdata(file));
119 #endif /* _V4L2_DEV_H */