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-rw-r--r--include/media/v4l2-dev.h75
1 files changed, 34 insertions, 41 deletions
diff --git a/include/media/v4l2-dev.h b/include/media/v4l2-dev.h
index 2745e1afc722..a0a6b41c5e09 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 */