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[media] vb2: add vb2_get_unmapped_area in vb2 core

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no mmu system needs get_unmapped_area file operations to do mmap

Signed-off-by: Scott Jiang <[email protected]>
Signed-off-by: Marek Szyprowski <[email protected]>
Signed-off-by: Sylwester Nawrocki <[email protected]>
Signed-off-by: Mauro Carvalho Chehab <[email protected]>
This commit is contained in:
Scott Jiang 2011-09-21 09:25:23 -03:00 • committed by Mauro Carvalho Chehab
commit 6f524ec156
2 changed files with 38 additions and 0 deletions
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31
drivers/media/video/videobuf2-core.c
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@ -1567,6 +1567,37 @@ int vb2_mmap(struct vb2_queue *q, struct vm_area_struct *vma)
}
EXPORT_SYMBOL_GPL(vb2_mmap);
#ifndef CONFIG_MMU
unsigned long vb2_get_unmapped_area(struct vb2_queue *q,
unsigned long addr,
unsigned long len,
unsigned long pgoff,
unsigned long flags)
{
unsigned long off = pgoff << PAGE_SHIFT;
struct vb2_buffer *vb;
unsigned int buffer, plane;
int ret;
if (q->memory != V4L2_MEMORY_MMAP) {
dprintk(1, "Queue is not currently set up for mmap\n");
return -EINVAL;
}
/*
* Find the plane corresponding to the offset passed by userspace.
*/
ret = __find_plane_by_offset(q, off, &buffer, &plane);
if (ret)
return ret;
vb = q->bufs[buffer];
return (unsigned long)vb2_plane_vaddr(vb, plane);
}
EXPORT_SYMBOL_GPL(vb2_get_unmapped_area);
#endif
static int __vb2_init_fileio(struct vb2_queue *q, int read);
static int __vb2_cleanup_fileio(struct vb2_queue *q);