1 /*
2  * videobuf2-memops.h - generic memory handling routines for videobuf2
3  *
4  * Copyright (C) 2010 Samsung Electronics
5  *
6  * Author: Pawel Osciak <pawel@osciak.com>
7  *	   Marek Szyprowski <m.szyprowski@samsung.com>
8  *
9  * This program is free software; you can redistribute it and/or modify
10  * it under the terms of the GNU General Public License as published by
11  * the Free Software Foundation.
12  */
13 
14 #ifndef _MEDIA_VIDEOBUF2_MEMOPS_H
15 #define _MEDIA_VIDEOBUF2_MEMOPS_H
16 
17 #include <media/videobuf2-v4l2.h>
18 #include <linux/mm.h>
19 #include <linux/refcount.h>
20 
21 /**
22  * struct vb2_vmarea_handler - common vma refcount tracking handler.
23  *
24  * @refcount:	pointer to &refcount_t entry in the buffer.
25  * @put:	callback to function that decreases buffer refcount.
26  * @arg:	argument for @put callback.
27  */
28 struct vb2_vmarea_handler {
29 	refcount_t		*refcount;
30 	void			(*put)(void *arg);
31 	void			*arg;
32 };
33 
34 extern const struct vm_operations_struct vb2_common_vm_ops;
35 
36 struct frame_vector *vb2_create_framevec(unsigned long start,
37 					 unsigned long length,
38 					 bool write);
39 void vb2_destroy_framevec(struct frame_vector *vec);
40 
41 #endif
42