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401998fa MCC |
1 | /* |
2 | * | |
3 | * V 4 L 2 D R I V E R H E L P E R A P I | |
4 | * | |
5 | * Moved from videodev2.h | |
6 | * | |
7 | * Some commonly needed functions for drivers (v4l2-common.o module) | |
8 | */ | |
9 | #ifndef _V4L2_DEV_H | |
10 | #define _V4L2_DEV_H | |
11 | ||
401998fa MCC |
12 | #include <linux/poll.h> |
13 | #include <linux/fs.h> | |
14 | #include <linux/device.h> | |
7f8ecfab | 15 | #include <linux/cdev.h> |
401998fa | 16 | #include <linux/mutex.h> |
401998fa | 17 | #include <linux/videodev2.h> |
401998fa | 18 | |
401998fa | 19 | #define VIDEO_MAJOR 81 |
bfa8a273 | 20 | |
401998fa MCC |
21 | #define VFL_TYPE_GRABBER 0 |
22 | #define VFL_TYPE_VBI 1 | |
23 | #define VFL_TYPE_RADIO 2 | |
24 | #define VFL_TYPE_VTX 3 | |
dd89601d | 25 | #define VFL_TYPE_MAX 4 |
401998fa | 26 | |
a399810c HV |
27 | struct v4l2_ioctl_callbacks; |
28 | ||
dc93a70c HV |
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) | |
33 | ||
401998fa MCC |
34 | /* |
35 | * Newer version of video_device, handled by videodev2.c | |
36 | * This version moves redundant code from video device code to | |
37 | * the common handler | |
38 | */ | |
401998fa MCC |
39 | |
40 | struct video_device | |
41 | { | |
42 | /* device ops */ | |
5e87efa3 | 43 | const struct file_operations *fops; |
401998fa | 44 | |
54bd5b66 | 45 | /* sysfs */ |
22a04f10 | 46 | struct device dev; /* v4l device */ |
dc93a70c | 47 | struct cdev *cdev; /* character device */ |
5e85e732 | 48 | struct device *parent; /* device parent */ |
54bd5b66 | 49 | |
401998fa | 50 | /* device info */ |
401998fa | 51 | char name[32]; |
0ea6bc8d | 52 | int vfl_type; |
dc93a70c | 53 | /* 'minor' is set to -1 if the registration failed */ |
401998fa | 54 | int minor; |
dd89601d | 55 | u16 num; |
dc93a70c HV |
56 | /* use bitops to set/clear/test flags */ |
57 | unsigned long flags; | |
de1e575d | 58 | /* attribute to differentiate multiple indices on one physical device */ |
539a7555 | 59 | int index; |
401998fa | 60 | |
22a04f10 | 61 | int debug; /* Activates debug level*/ |
401998fa MCC |
62 | |
63 | /* Video standard vars */ | |
e75f9cee MCC |
64 | v4l2_std_id tvnorms; /* Supported tv norms */ |
65 | v4l2_std_id current_norm; /* Current tvnorm */ | |
401998fa MCC |
66 | |
67 | /* callbacks */ | |
dc93a70c | 68 | void (*release)(struct video_device *vdev); |
401998fa MCC |
69 | |
70 | /* ioctl callbacks */ | |
a399810c | 71 | const struct v4l2_ioctl_ops *ioctl_ops; |
401998fa MCC |
72 | }; |
73 | ||
bfa8a273 | 74 | /* dev to video-device */ |
22a04f10 | 75 | #define to_video_device(cd) container_of(cd, struct video_device, dev) |
e90ff923 | 76 | |
dc93a70c | 77 | /* Register video devices. Note that if video_register_device fails, |
bfa8a273 HV |
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 | |
dc93a70c HV |
80 | you call video_device_release() on failure. |
81 | ||
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, | |
bfa8a273 | 85 | int type, int nr, int index); |
dc93a70c HV |
86 | |
87 | /* Unregister video devices. Will do nothing if vdev == NULL or | |
88 | vdev->minor < 0. */ | |
89 | void video_unregister_device(struct video_device *vdev); | |
401998fa | 90 | |
bfa8a273 HV |
91 | /* helper functions to alloc/release struct video_device, the |
92 | latter can also be used for video_device->release(). */ | |
e138c592 | 93 | struct video_device * __must_check video_device_alloc(void); |
bfa8a273 | 94 | |
dc93a70c HV |
95 | /* this release function frees the vdev pointer */ |
96 | void video_device_release(struct video_device *vdev); | |
bfa8a273 | 97 | |
f9e86b5e HV |
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. */ | |
dc93a70c | 101 | void video_device_release_empty(struct video_device *vdev); |
401998fa | 102 | |
401998fa | 103 | /* helper functions to access driver private data. */ |
dc93a70c | 104 | static inline void *video_get_drvdata(struct video_device *vdev) |
401998fa | 105 | { |
dc93a70c | 106 | return dev_get_drvdata(&vdev->dev); |
401998fa MCC |
107 | } |
108 | ||
dc93a70c | 109 | static inline void video_set_drvdata(struct video_device *vdev, void *data) |
401998fa | 110 | { |
dc93a70c | 111 | dev_set_drvdata(&vdev->dev, data); |
401998fa | 112 | } |
38ee04f0 | 113 | |
bfa8a273 HV |
114 | struct video_device *video_devdata(struct file *file); |
115 | ||
116 | /* Combine video_get_drvdata and video_devdata as this is | |
117 | used very often. */ | |
118 | static inline void *video_drvdata(struct file *file) | |
119 | { | |
120 | return video_get_drvdata(video_devdata(file)); | |
121 | } | |
401998fa | 122 | |
dc93a70c HV |
123 | static inline int video_is_unregistered(struct video_device *vdev) |
124 | { | |
125 | return test_bit(V4L2_FL_UNREGISTERED, &vdev->flags); | |
126 | } | |
127 | ||
401998fa | 128 | #endif /* _V4L2_DEV_H */ |