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author | Mauro Carvalho Chehab <mchehab@infradead.org> | 2007-08-02 23:31:33 -0300 |
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committer | Mauro Carvalho Chehab <mchehab@infradead.org> | 2007-10-09 22:14:56 -0300 |
commit | 87b9ad070cf76c0f1e8cf836f7eb86e9ac94e34a (patch) | |
tree | aeda5c7b1434350a476005c85dc39173ead11090 /include/media | |
parent | 6bb2790f8a0cf93d3dbed6b6e986441110e6174b (diff) | |
download | kernel_samsung_smdk4412-87b9ad070cf76c0f1e8cf836f7eb86e9ac94e34a.zip kernel_samsung_smdk4412-87b9ad070cf76c0f1e8cf836f7eb86e9ac94e34a.tar.gz kernel_samsung_smdk4412-87b9ad070cf76c0f1e8cf836f7eb86e9ac94e34a.tar.bz2 |
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')
-rw-r--r-- | include/media/videobuf-vmalloc.h | 44 |
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 0000000..5fff68d --- /dev/null +++ b/include/media/videobuf-vmalloc.h @@ -0,0 +1,44 @@ +/* + * helper functions for vmalloc capture buffers + * + * The functions expect the hardware being able to scatter gatter + * (i.e. the buffers are not linear in physical memory, but fragmented + * into PAGE_SIZE chunks). They also assume the driver does not need + * to touch the video data. + * + * (c) 2007 Mauro Carvalho Chehab, <mchehab@infradead.org> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 + */ + +#include <media/videobuf-core.h> + +/* --------------------------------------------------------------------- */ + +struct videbuf_vmalloc_memory +{ + u32 magic; + + /* for mmap'ed buffers */ + struct videobuf_mapping *map; + + void *vmalloc; + + /* remap_vmalloc_range seems to need to run after mmap() on some cases */ + struct vm_area_struct *vma; +}; + +void videobuf_queue_vmalloc_init(struct videobuf_queue* q, + struct videobuf_queue_ops *ops, + void *dev, + spinlock_t *irqlock, + enum v4l2_buf_type type, + enum v4l2_field field, + unsigned int msize, + void *priv); + +void *videobuf_to_vmalloc (struct videobuf_buffer *buf); + +void videobuf_vmalloc_free (struct videobuf_buffer *buf); |