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@kernel.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                *vaddr;
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 			 struct mutex *ext_lock);
41 
42 void *videobuf_to_vmalloc(struct videobuf_buffer *buf);
43 
44 void videobuf_vmalloc_free(struct videobuf_buffer *buf);
45 
46 #endif
47