include/media/v4l2-dev.h

   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
  12 #define OBSOLETE_DEVDATA 1 /* to be removed soon */
  13
  14 #include <linux/poll.h>
  15 #include <linux/fs.h>
  16 #include <linux/device.h>
  17 #include <linux/mutex.h>
  18 #include <linux/compiler.h> /* need __user */
  19 #include <linux/videodev2.h>
  20
  21 #define VIDEO_MAJOR     81
  22 /* Minor device allocation */
  23 #define MINOR_VFL_TYPE_GRABBER_MIN   0
  24 #define MINOR_VFL_TYPE_GRABBER_MAX  63
  25 #define MINOR_VFL_TYPE_RADIO_MIN    64
  26 #define MINOR_VFL_TYPE_RADIO_MAX   127
  27 #define MINOR_VFL_TYPE_VTX_MIN     192
  28 #define MINOR_VFL_TYPE_VTX_MAX     223
  29 #define MINOR_VFL_TYPE_VBI_MIN     224
  30 #define MINOR_VFL_TYPE_VBI_MAX     255
  31
  32 #define VFL_TYPE_GRABBER        0
  33 #define VFL_TYPE_VBI            1
  34 #define VFL_TYPE_RADIO          2
  35 #define VFL_TYPE_VTX            3
  36
  37 struct v4l2_ioctl_callbacks;
  38
  39 /*
  40  * Newer version of video_device, handled by videodev2.c
  41  *      This version moves redundant code from video device code to
  42  *      the common handler
  43  */
  44
  45 struct video_device
  46 {
  47         /* device ops */
  48         const struct file_operations *fops;
  49
  50         /* sysfs */
  51         struct device dev;              /* v4l device */
  52         struct device *parent;          /* device parent */
  53
  54         /* device info */
  55         char name[32];
  56         int vfl_type;
  57         int minor;
  58         /* attribute to differentiate multiple indices on one physical device */
  59         int index;
  60
  61         int debug;                      /* Activates debug level*/
  62
  63         /* Video standard vars */
  64         v4l2_std_id tvnorms;            /* Supported tv norms */
  65         v4l2_std_id current_norm;       /* Current tvnorm */
  66
  67         /* callbacks */
  68         void (*release)(struct video_device *vfd);
  69
  70         /* ioctl callbacks */
  71         const struct v4l2_ioctl_ops *ioctl_ops;
  72
  73 #ifdef OBSOLETE_DEVDATA /* to be removed soon */
  74         /* dev->driver_data will be used instead some day.
  75          * Use the video_{get|set}_drvdata() helper functions,
  76          * so the switch over will be transparent for you.
  77          * Or use {pci|usb}_{get|set}_drvdata() directly. */
  78         void *priv;
  79 #endif
  80
  81         /* for videodev.c internal usage -- please don't touch */
  82         int users;                     /* video_exclusive_{open|close} ... */
  83         struct mutex lock;             /* ... helper function uses these   */
  84 };
  85
  86 /* Class-dev to video-device */
  87 #define to_video_device(cd) container_of(cd, struct video_device, dev)
  88
  89 /* Version 2 functions */
  90 extern int video_register_device(struct video_device *vfd, int type, int nr);
  91 int video_register_device_index(struct video_device *vfd, int type, int nr,
  92                                         int index);
  93 void video_unregister_device(struct video_device *);
  94
  95 /* helper functions to alloc / release struct video_device, the
  96    later can be used for video_device->release() */
  97 struct video_device *video_device_alloc(void);
  98 void video_device_release(struct video_device *vfd);
  99
 100 #ifdef OBSOLETE_DEVDATA /* to be removed soon */
 101 /* helper functions to access driver private data. */
 102 static inline void *video_get_drvdata(struct video_device *dev)
 103 {
 104         return dev->priv;
 105 }
 106
 107 static inline void video_set_drvdata(struct video_device *dev, void *data)
 108 {
 109         dev->priv = data;
 110 }
 111
 112 /* Obsolete stuff - Still needed for radio devices and obsolete drivers */
 113 extern struct video_device* video_devdata(struct file*);
 114 extern int video_exclusive_open(struct inode *inode, struct file *file);
 115 extern int video_exclusive_release(struct inode *inode, struct file *file);
 116 #endif
 117
 118 #endif /* _V4L2_DEV_H */