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-core.h>
  18
  19 /**
  20  * vb2_vmarea_handler - common vma refcount tracking handler
  21  * @refcount:   pointer to refcount entry in the buffer
  22  * @put:        callback to function that decreases buffer refcount
  23  * @arg:        argument for @put callback
  24  */
  25 struct vb2_vmarea_handler {
  26         atomic_t                *refcount;
  27         void                    (*put)(void *arg);
  28         void                    *arg;
  29 };
  30
  31 extern const struct vm_operations_struct vb2_common_vm_ops;
  32
  33 int vb2_get_contig_userptr(unsigned long vaddr, unsigned long size,
  34                            struct vm_area_struct **res_vma, dma_addr_t *res_pa);
  35
  36 int vb2_mmap_pfn_range(struct vm_area_struct *vma, unsigned long paddr,
  37                                 unsigned long size,
  38                                 const struct vm_operations_struct *vm_ops,
  39                                 void *priv);
  40
  41 struct vm_area_struct *vb2_get_vma(struct vm_area_struct *vma);
  42 void vb2_put_vma(struct vm_area_struct *vma);
  43
  44
  45 #endif