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authorMauro Carvalho Chehab <mchehab@infradead.org>2007-08-02 22:31:33 -0400
committerMauro Carvalho Chehab <mchehab@infradead.org>2007-10-09 21:14:56 -0400
commit87b9ad070cf76c0f1e8cf836f7eb86e9ac94e34a (patch)
treeaeda5c7b1434350a476005c85dc39173ead11090 /include/media/videobuf-vmalloc.h
parent6bb2790f8a0cf93d3dbed6b6e986441110e6174b (diff)
V4L/DVB (6254): Add videobuf-vmalloc
Adds a newer videobuf-vmalloc module. This module uses the same videobuf controls, but implements memory allocation based on vmalloc methods. With this method, an USB driver can use video-buf, without needing to request memory from the DMA-safe area. Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>
Diffstat (limited to 'include/media/videobuf-vmalloc.h')
-rw-r--r--include/media/videobuf-vmalloc.h44
1 files changed, 44 insertions, 0 deletions
diff --git a/include/media/videobuf-vmalloc.h b/include/media/videobuf-vmalloc.h
new file mode 100644
index 00000000000..5fff68df668
--- /dev/null
+++ b/include/media/videobuf-vmalloc.h
@@ -0,0 +1,44 @@
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
20struct 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
33void 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
42void *videobuf_to_vmalloc (struct videobuf_buffer *buf);
43
44void videobuf_vmalloc_free (struct videobuf_buffer *buf);