Commit | Line | Data |
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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 | ||
401998fa MCC |
29 | /* |
30 | * Newer version of video_device, handled by videodev2.c | |
31 | * This version moves redundant code from video device code to | |
32 | * the common handler | |
33 | */ | |
401998fa MCC |
34 | |
35 | struct video_device | |
36 | { | |
37 | /* device ops */ | |
5e87efa3 | 38 | const struct file_operations *fops; |
401998fa | 39 | |
54bd5b66 | 40 | /* sysfs */ |
22a04f10 | 41 | struct device dev; /* v4l device */ |
7f8ecfab HV |
42 | struct cdev cdev; /* character device */ |
43 | void (*cdev_release)(struct kobject *kobj); | |
5e85e732 | 44 | struct device *parent; /* device parent */ |
54bd5b66 | 45 | |
401998fa | 46 | /* device info */ |
401998fa | 47 | char name[32]; |
0ea6bc8d | 48 | int vfl_type; |
401998fa | 49 | int minor; |
dd89601d | 50 | u16 num; |
de1e575d | 51 | /* attribute to differentiate multiple indices on one physical device */ |
539a7555 | 52 | int index; |
401998fa | 53 | |
22a04f10 | 54 | int debug; /* Activates debug level*/ |
401998fa MCC |
55 | |
56 | /* Video standard vars */ | |
e75f9cee MCC |
57 | v4l2_std_id tvnorms; /* Supported tv norms */ |
58 | v4l2_std_id current_norm; /* Current tvnorm */ | |
401998fa MCC |
59 | |
60 | /* callbacks */ | |
61 | void (*release)(struct video_device *vfd); | |
62 | ||
63 | /* ioctl callbacks */ | |
a399810c | 64 | const struct v4l2_ioctl_ops *ioctl_ops; |
401998fa MCC |
65 | }; |
66 | ||
bfa8a273 | 67 | /* dev to video-device */ |
22a04f10 | 68 | #define to_video_device(cd) container_of(cd, struct video_device, dev) |
e90ff923 | 69 | |
bfa8a273 HV |
70 | /* Register and unregister devices. Note that if video_register_device fails, |
71 | the release() callback of the video_device structure is *not* called, so | |
72 | the caller is responsible for freeing any data. Usually that means that | |
73 | you call video_device_release() on failure. */ | |
e138c592 | 74 | int __must_check video_register_device(struct video_device *vfd, int type, int nr); |
bfa8a273 HV |
75 | int __must_check video_register_device_index(struct video_device *vfd, |
76 | int type, int nr, int index); | |
77 | void video_unregister_device(struct video_device *vfd); | |
401998fa | 78 | |
bfa8a273 HV |
79 | /* helper functions to alloc/release struct video_device, the |
80 | latter can also be used for video_device->release(). */ | |
e138c592 | 81 | struct video_device * __must_check video_device_alloc(void); |
bfa8a273 | 82 | |
f9e86b5e | 83 | /* this release function frees the vfd pointer */ |
401998fa | 84 | void video_device_release(struct video_device *vfd); |
bfa8a273 | 85 | |
f9e86b5e HV |
86 | /* this release function does nothing, use when the video_device is a |
87 | static global struct. Note that having a static video_device is | |
88 | a dubious construction at best. */ | |
89 | void video_device_release_empty(struct video_device *vfd); | |
401998fa | 90 | |
401998fa MCC |
91 | /* helper functions to access driver private data. */ |
92 | static inline void *video_get_drvdata(struct video_device *dev) | |
93 | { | |
601e9444 | 94 | return dev_get_drvdata(&dev->dev); |
401998fa MCC |
95 | } |
96 | ||
97 | static inline void video_set_drvdata(struct video_device *dev, void *data) | |
98 | { | |
601e9444 | 99 | dev_set_drvdata(&dev->dev, data); |
401998fa | 100 | } |
38ee04f0 | 101 | |
bfa8a273 HV |
102 | struct video_device *video_devdata(struct file *file); |
103 | ||
104 | /* Combine video_get_drvdata and video_devdata as this is | |
105 | used very often. */ | |
106 | static inline void *video_drvdata(struct file *file) | |
107 | { | |
108 | return video_get_drvdata(video_devdata(file)); | |
109 | } | |
401998fa MCC |
110 | |
111 | #endif /* _V4L2_DEV_H */ |