include/media/videobuf-vmalloc.h

   1 /*
   2  * helper functions for vmalloc capture buffers
   3  *
   4  * The functions expect the hardware being able to scatter gatter
   5  * (i.e. the buffers are not linear in physical memory, but fragmented
   6  * into PAGE_SIZE chunks).  They also assume the driver does not need
   7  * to touch the video data.
   8  *
   9  * (c) 2007 Mauro Carvalho Chehab, <mchehab@infradead.org>
  10  *
  11  * This program is free software; you can redistribute it and/or modify
  12  * it under the terms of the GNU General Public License as published by
  13  * the Free Software Foundation; either version 2
  14  */
  15
  16 #include <media/videobuf-core.h>
  17
  18 /* --------------------------------------------------------------------- */
  19
  20 struct videbuf_vmalloc_memory
  21 {
  22         u32                 magic;
  23
  24         /* for mmap'ed buffers */
  25         struct videobuf_mapping *map;
  26
  27         void                *vmalloc;
  28
  29         /* remap_vmalloc_range seems to need to run after mmap() on some cases */
  30         struct vm_area_struct *vma;
  31 };
  32
  33 void videobuf_queue_vmalloc_init(struct videobuf_queue* q,
  34                          struct videobuf_queue_ops *ops,
  35                          void *dev,
  36                          spinlock_t *irqlock,
  37                          enum v4l2_buf_type type,
  38                          enum v4l2_field field,
  39                          unsigned int msize,
  40                          void *priv);
  41
  42 void *videobuf_to_vmalloc (struct videobuf_buffer *buf);
  43
  44 void videobuf_vmalloc_free (struct videobuf_buffer *buf);