From bfa8a273bb91078ea193ab94c717889928f3b925 Mon Sep 17 00:00:00 2001 From: Hans Verkuil Date: Sat, 23 Aug 2008 07:48:38 -0300 Subject: V4L/DVB (8787): v4l2-dev: cleanups and add video_drvdata helper function Cleanup v4l2-dev.[ch], add/improve comments and add a new helper function: video_drvdata() that can get the private driver data from a file struct. Signed-off-by: Hans Verkuil Signed-off-by: Mauro Carvalho Chehab --- include/media/v4l2-dev.h | 35 +++++++++++++++++++++-------------- 1 file changed, 21 insertions(+), 14 deletions(-) (limited to 'include/media') diff --git a/include/media/v4l2-dev.h b/include/media/v4l2-dev.h index 1d4df571060..fb92e3d22d7 100644 --- a/include/media/v4l2-dev.h +++ b/include/media/v4l2-dev.h @@ -9,16 +9,14 @@ #ifndef _V4L2_DEV_H #define _V4L2_DEV_H -#define OBSOLETE_DEVDATA 1 /* to be removed soon */ - #include #include #include #include -#include /* need __user */ #include #define VIDEO_MAJOR 81 + /* Minor device allocation */ #define MINOR_VFL_TYPE_GRABBER_MIN 0 #define MINOR_VFL_TYPE_GRABBER_MAX 63 @@ -71,20 +69,25 @@ struct video_device const struct v4l2_ioctl_ops *ioctl_ops; }; -/* Class-dev to video-device */ +/* dev to video-device */ #define to_video_device(cd) container_of(cd, struct video_device, dev) -/* Version 2 functions */ +/* 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 *); +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() */ +/* 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); + /* 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. */ @@ -101,9 +104,13 @@ static inline void video_set_drvdata(struct video_device *dev, void *data) dev_set_drvdata(&dev->dev, data); } -#ifdef OBSOLETE_DEVDATA /* to be removed soon */ -/* Obsolete stuff - Still needed for radio devices and obsolete drivers */ -extern struct video_device* video_devdata(struct 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 */ -- cgit v1.2.3