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 #define VFL_TYPE_GRABBER 0
22 #define VFL_TYPE_VBI 1
23 #define VFL_TYPE_RADIO 2
24 #define VFL_TYPE_VTX 3
25 #define VFL_TYPE_MAX 4
27 struct v4l2_ioctl_callbacks;
30 /* Flag to mark the video_device struct as unregistered.
31 Drivers can set this flag if they want to block all future
32 device access. It is set by video_unregister_device. */
33 #define V4L2_FL_UNREGISTERED (0)
36 * Newer version of video_device, handled by videodev2.c
37 * This version moves redundant code from video device code to
44 const struct file_operations *fops;
47 struct device dev; /* v4l device */
48 struct cdev *cdev; /* character device */
50 /* Set either parent or v4l2_dev if your driver uses v4l2_device */
51 struct device *parent; /* device parent */
52 struct v4l2_device *v4l2_dev; /* v4l2_device parent */
57 /* 'minor' is set to -1 if the registration failed */
60 /* use bitops to set/clear/test flags */
62 /* attribute to differentiate multiple indices on one physical device */
65 int debug; /* Activates debug level*/
67 /* Video standard vars */
68 v4l2_std_id tvnorms; /* Supported tv norms */
69 v4l2_std_id current_norm; /* Current tvnorm */
72 void (*release)(struct video_device *vdev);
75 const struct v4l2_ioctl_ops *ioctl_ops;
78 /* dev to video-device */
79 #define to_video_device(cd) container_of(cd, struct video_device, dev)
81 /* Register video devices. Note that if video_register_device fails,
82 the release() callback of the video_device structure is *not* called, so
83 the caller is responsible for freeing any data. Usually that means that
84 you call video_device_release() on failure.
86 Also note that vdev->minor is set to -1 if the registration failed. */
87 int __must_check video_register_device(struct video_device *vdev, int type, int nr);
88 int __must_check video_register_device_index(struct video_device *vdev,
89 int type, int nr, int index);
91 /* Unregister video devices. Will do nothing if vdev == NULL or
93 void video_unregister_device(struct video_device *vdev);
95 /* helper functions to alloc/release struct video_device, the
96 latter can also be used for video_device->release(). */
97 struct video_device * __must_check video_device_alloc(void);
99 /* this release function frees the vdev pointer */
100 void video_device_release(struct video_device *vdev);
102 /* this release function does nothing, use when the video_device is a
103 static global struct. Note that having a static video_device is
104 a dubious construction at best. */
105 void video_device_release_empty(struct video_device *vdev);
107 /* helper functions to access driver private data. */
108 static inline void *video_get_drvdata(struct video_device *vdev)
110 return dev_get_drvdata(&vdev->dev);
113 static inline void video_set_drvdata(struct video_device *vdev, void *data)
115 dev_set_drvdata(&vdev->dev, data);
118 struct video_device *video_devdata(struct file *file);
120 /* Combine video_get_drvdata and video_devdata as this is
122 static inline void *video_drvdata(struct file *file)
124 return video_get_drvdata(video_devdata(file));
127 static inline int video_is_unregistered(struct video_device *vdev)
129 return test_bit(V4L2_FL_UNREGISTERED, &vdev->flags);
132 #endif /* _V4L2_DEV_H */