media-devnode.c File Reference

#include <linux/errno.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/kmod.h>
#include <linux/slab.h>
#include <linux/mm.h>
#include <linux/string.h>
#include <linux/types.h>
#include <linux/uaccess.h>
#include <media/media-devnode.h>

Go to the source code of this file.

Macros
#define	pr_fmt(fmt)   KBUILD_MODNAME ": " fmt
#define	MEDIA_NUM_DEVICES   256
#define	MEDIA_NAME   "media"

Functions
int __must_check	media_devnode_register (struct media_devnode *mdev)
void	media_devnode_unregister (struct media_devnode *mdev)
	subsys_initcall (media_devnode_init)

Macro Definition Documentation

#define MEDIA_NAME   "media"

Definition at line 49 of file media-devnode.c.

#define MEDIA_NUM_DEVICES   256

Definition at line 48 of file media-devnode.c.

#define pr_fmt

(

fmt

)

KBUILD_MODNAME ": " fmt

Definition at line 33 of file media-devnode.c.

Function Documentation

int __must_check media_devnode_register

(

struct media_devnode *

mdev

)

media_devnode_register - register a media device node : media device node structure we want to register

The registration code assigns minor numbers and registers the new device node with the kernel. An error is returned if no free minor number can be found, or if the registration of the device node fails.

Zero is returned on success.

Note that if the media_devnode_register call fails, the release() callback of the media_devnode structure is not called, so the caller is responsible for freeing any data.

Definition at line 210 of file media-devnode.c.

void media_devnode_unregister

(

struct media_devnode *

mdev

)

media_devnode_unregister - unregister a media device node : the device node to unregister

This unregisters the passed device. Future open calls will be met with errors.

This function can safely be called if the device node has never been registered or has already been unregistered.

Definition at line 273 of file media-devnode.c.

subsys_initcall

(

media_devnode_init

)