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;
29 /* Flag to mark the video_device struct as unregistered.
30 Drivers can set this flag if they want to block all future
31 device access. It is set by video_unregister_device. */
32 #define V4L2_FL_UNREGISTERED (0)
35 * Newer version of video_device, handled by videodev2.c
36 * This version moves redundant code from video device code to
43 const struct file_operations *fops;
46 struct device dev; /* v4l device */
47 struct cdev *cdev; /* character device */
48 struct device *parent; /* device parent */
53 /* 'minor' is set to -1 if the registration failed */
56 /* use bitops to set/clear/test flags */
58 /* attribute to differentiate multiple indices on one physical device */
61 int debug; /* Activates debug level*/
63 /* Video standard vars */
64 v4l2_std_id tvnorms; /* Supported tv norms */
65 v4l2_std_id current_norm; /* Current tvnorm */
68 void (*release)(struct video_device *vdev);
71 const struct v4l2_ioctl_ops *ioctl_ops;
74 /* dev to video-device */
75 #define to_video_device(cd) container_of(cd, struct video_device, dev)
77 /* Register video devices. Note that if video_register_device fails,
78 the release() callback of the video_device structure is *not* called, so
79 the caller is responsible for freeing any data. Usually that means that
80 you call video_device_release() on failure.
82 Also note that vdev->minor is set to -1 if the registration failed. */
83 int __must_check video_register_device(struct video_device *vdev, int type, int nr);
84 int __must_check video_register_device_index(struct video_device *vdev,
85 int type, int nr, int index);
87 /* Unregister video devices. Will do nothing if vdev == NULL or
89 void video_unregister_device(struct video_device *vdev);
91 /* helper functions to alloc/release struct video_device, the
92 latter can also be used for video_device->release(). */
93 struct video_device * __must_check video_device_alloc(void);
95 /* this release function frees the vdev pointer */
96 void video_device_release(struct video_device *vdev);
98 /* this release function does nothing, use when the video_device is a
99 static global struct. Note that having a static video_device is
100 a dubious construction at best. */
101 void video_device_release_empty(struct video_device *vdev);
103 /* helper functions to access driver private data. */
104 static inline void *video_get_drvdata(struct video_device *vdev)
106 return dev_get_drvdata(&vdev->dev);
109 static inline void video_set_drvdata(struct video_device *vdev, void *data)
111 dev_set_drvdata(&vdev->dev, data);
114 struct video_device *video_devdata(struct file *file);
116 /* Combine video_get_drvdata and video_devdata as this is
118 static inline void *video_drvdata(struct file *file)
120 return video_get_drvdata(video_devdata(file));
123 static inline int video_is_unregistered(struct video_device *vdev)
125 return test_bit(V4L2_FL_UNREGISTERED, &vdev->flags);
128 #endif /* _V4L2_DEV_H */