include/media/videobuf-vmalloc.h

   1 /*
   2  * helper functions for vmalloc capture buffers
   3  *
   4  * The functions expect the hardware being able to scatter gather
   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 #ifndef _VIDEOBUF_VMALLOC_H
  16 #define _VIDEOBUF_VMALLOC_H
  17
  18 #include <media/videobuf-core.h>
  19
  20 /* --------------------------------------------------------------------- */
  21
  22 struct videobuf_vmalloc_memory {
  23         u32                 magic;
  24
  25         void                *vmalloc;
  26
  27         /* remap_vmalloc_range seems to need to run
  28          * after mmap() on some cases */
  29         struct vm_area_struct *vma;
  30 };
  31
  32 void videobuf_queue_vmalloc_init(struct videobuf_queue *q,
  33                          const struct videobuf_queue_ops *ops,
  34                          struct device *dev,
  35                          spinlock_t *irqlock,
  36                          enum v4l2_buf_type type,
  37                          enum v4l2_field field,
  38                          unsigned int msize,
  39                          void *priv);
  40
  41 void *videobuf_to_vmalloc(struct videobuf_buffer *buf);
  42
  43 void videobuf_vmalloc_free(struct videobuf_buffer *buf);
  44
  45 #endif