diff options
Diffstat (limited to 'include/media/v4l2-dev.h')
| -rw-r--r-- | include/media/v4l2-dev.h | 75 |
1 files changed, 34 insertions, 41 deletions
diff --git a/include/media/v4l2-dev.h b/include/media/v4l2-dev.h index 2745e1afc72..a0a6b41c5e0 100644 --- a/include/media/v4l2-dev.h +++ b/include/media/v4l2-dev.h @@ -9,30 +9,20 @@ #ifndef _V4L2_DEV_H #define _V4L2_DEV_H -#define OBSOLETE_DEVDATA 1 /* to be removed soon */ - #include <linux/poll.h> #include <linux/fs.h> #include <linux/device.h> +#include <linux/cdev.h> #include <linux/mutex.h> -#include <linux/compiler.h> /* need __user */ #include <linux/videodev2.h> #define VIDEO_MAJOR 81 -/* Minor device allocation */ -#define MINOR_VFL_TYPE_GRABBER_MIN 0 -#define MINOR_VFL_TYPE_GRABBER_MAX 63 -#define MINOR_VFL_TYPE_RADIO_MIN 64 -#define MINOR_VFL_TYPE_RADIO_MAX 127 -#define MINOR_VFL_TYPE_VTX_MIN 192 -#define MINOR_VFL_TYPE_VTX_MAX 223 -#define MINOR_VFL_TYPE_VBI_MIN 224 -#define MINOR_VFL_TYPE_VBI_MAX 255 #define VFL_TYPE_GRABBER 0 #define VFL_TYPE_VBI 1 #define VFL_TYPE_RADIO 2 #define VFL_TYPE_VTX 3 +#define VFL_TYPE_MAX 4 struct v4l2_ioctl_callbacks; @@ -49,12 +39,15 @@ struct video_device /* sysfs */ struct device dev; /* v4l device */ + struct cdev cdev; /* character device */ + void (*cdev_release)(struct kobject *kobj); struct device *parent; /* device parent */ /* device info */ char name[32]; int vfl_type; int minor; + u16 num; /* attribute to differentiate multiple indices on one physical device */ int index; @@ -69,50 +62,50 @@ struct video_device /* ioctl callbacks */ const struct v4l2_ioctl_ops *ioctl_ops; - -#ifdef OBSOLETE_DEVDATA /* to be removed soon */ - /* dev->driver_data will be used instead some day. - * Use the video_{get|set}_drvdata() helper functions, - * so the switch over will be transparent for you. - * Or use {pci|usb}_{get|set}_drvdata() directly. */ - void *priv; -#endif - - /* for videodev.c internal usage -- please don't touch */ - int users; /* video_exclusive_{open|close} ... */ - struct mutex lock; /* ... helper function uses these */ }; -/* Class-dev to video-device */ +/* dev to video-device */ #define to_video_device(cd) container_of(cd, struct video_device, dev) -/* Version 2 functions */ -extern int video_register_device(struct video_device *vfd, int type, int nr); -int video_register_device_index(struct video_device *vfd, int type, int nr, - int index); -void video_unregister_device(struct video_device *); +/* Register and unregister devices. Note that if video_register_device fails, + the release() callback of the video_device structure is *not* called, so + the caller is responsible for freeing any data. Usually that means that + you call video_device_release() on failure. */ +int __must_check video_register_device(struct video_device *vfd, int type, int nr); +int __must_check video_register_device_index(struct video_device *vfd, + int type, int nr, int index); +void video_unregister_device(struct video_device *vfd); -/* helper functions to alloc / release struct video_device, the - later can be used for video_device->release() */ -struct video_device *video_device_alloc(void); +/* helper functions to alloc/release struct video_device, the + latter can also be used for video_device->release(). */ +struct video_device * __must_check video_device_alloc(void); + +/* this release function frees the vfd pointer */ void video_device_release(struct video_device *vfd); -#ifdef OBSOLETE_DEVDATA /* to be removed soon */ +/* this release function does nothing, use when the video_device is a + static global struct. Note that having a static video_device is + a dubious construction at best. */ +void video_device_release_empty(struct video_device *vfd); + /* helper functions to access driver private data. */ static inline void *video_get_drvdata(struct video_device *dev) { - return dev->priv; + return dev_get_drvdata(&dev->dev); } static inline void video_set_drvdata(struct video_device *dev, void *data) { - dev->priv = data; + dev_set_drvdata(&dev->dev, data); } -/* Obsolete stuff - Still needed for radio devices and obsolete drivers */ -extern struct video_device* video_devdata(struct file*); -extern int video_exclusive_open(struct inode *inode, struct file *file); -extern int video_exclusive_release(struct inode *inode, struct file *file); -#endif +struct video_device *video_devdata(struct file *file); + +/* Combine video_get_drvdata and video_devdata as this is + used very often. */ +static inline void *video_drvdata(struct file *file) +{ + return video_get_drvdata(video_devdata(file)); +} #endif /* _V4L2_DEV_H */ |