include/media/videobuf2-memops.h

   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