From 87b9ad070cf76c0f1e8cf836f7eb86e9ac94e34a Mon Sep 17 00:00:00 2001 From: Mauro Carvalho Chehab Date: Thu, 2 Aug 2007 23:31:33 -0300 Subject: 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 --- include/media/videobuf-vmalloc.h | 44 ++++++++++++++++++++++++++++++++++++++++ 1 file changed, 44 insertions(+) create mode 100644 include/media/videobuf-vmalloc.h (limited to 'include/media') diff --git a/include/media/videobuf-vmalloc.h b/include/media/videobuf-vmalloc.h new file mode 100644 index 000000000000..5fff68df6689 --- /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, + * + * 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 + +/* --------------------------------------------------------------------- */ + +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); -- cgit v1.2.3-55-g7522