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/mutex.h>
16 #include <linux/videodev2.h>
18 #define VIDEO_MAJOR 81
20 /* Minor device allocation */
21 #define MINOR_VFL_TYPE_GRABBER_MIN 0
22 #define MINOR_VFL_TYPE_GRABBER_MAX 63
23 #define MINOR_VFL_TYPE_RADIO_MIN 64
24 #define MINOR_VFL_TYPE_RADIO_MAX 127
25 #define MINOR_VFL_TYPE_VTX_MIN 192
26 #define MINOR_VFL_TYPE_VTX_MAX 223
27 #define MINOR_VFL_TYPE_VBI_MIN 224
28 #define MINOR_VFL_TYPE_VBI_MAX 255
30 #define VFL_TYPE_GRABBER 0
31 #define VFL_TYPE_VBI 1
32 #define VFL_TYPE_RADIO 2
33 #define VFL_TYPE_VTX 3
35 struct v4l2_ioctl_callbacks;
38 * Newer version of video_device, handled by videodev2.c
39 * This version moves redundant code from video device code to
46 const struct file_operations *fops;
49 struct device dev; /* v4l device */
50 struct device *parent; /* device parent */
56 /* attribute to differentiate multiple indices on one physical device */
59 int debug; /* Activates debug level*/
61 /* Video standard vars */
62 v4l2_std_id tvnorms; /* Supported tv norms */
63 v4l2_std_id current_norm; /* Current tvnorm */
66 void (*release)(struct video_device *vfd);
69 const struct v4l2_ioctl_ops *ioctl_ops;
72 /* dev to video-device */
73 #define to_video_device(cd) container_of(cd, struct video_device, dev)
75 /* Register and unregister devices. Note that if video_register_device fails,
76 the release() callback of the video_device structure is *not* called, so
77 the caller is responsible for freeing any data. Usually that means that
78 you call video_device_release() on failure. */
79 int __must_check video_register_device(struct video_device *vfd, int type, int nr);
80 int __must_check video_register_device_index(struct video_device *vfd,
81 int type, int nr, int index);
82 void video_unregister_device(struct video_device *vfd);
84 /* helper functions to alloc/release struct video_device, the
85 latter can also be used for video_device->release(). */
86 struct video_device * __must_check video_device_alloc(void);
88 /* this release function frees the vfd pointer */
89 void video_device_release(struct video_device *vfd);
91 /* this release function does nothing, use when the video_device is a
92 static global struct. Note that having a static video_device is
93 a dubious construction at best. */
94 void video_device_release_empty(struct video_device *vfd);
96 /* helper functions to access driver private data. */
97 static inline void *video_get_drvdata(struct video_device *dev)
99 return dev_get_drvdata(&dev->dev);
102 static inline void video_set_drvdata(struct video_device *dev, void *data)
104 dev_set_drvdata(&dev->dev, data);
107 struct video_device *video_devdata(struct file *file);
109 /* Combine video_get_drvdata and video_devdata as this is
111 static inline void *video_drvdata(struct file *file)
113 return video_get_drvdata(video_devdata(file));
116 #endif /* _V4L2_DEV_H */