From 6f524ec156ba31a18425fad9dd1287be0701d9d1 Mon Sep 17 00:00:00 2001 From: Scott Jiang <[scott.jiang.linux@gmail.com]> Date: Wed, 21 Sep 2011 09:25:23 -0300 Subject: [media] vb2: add vb2_get_unmapped_area in vb2 core no mmu system needs get_unmapped_area file operations to do mmap Signed-off-by: Scott Jiang Signed-off-by: Marek Szyprowski Signed-off-by: Sylwester Nawrocki Signed-off-by: Mauro Carvalho Chehab --- drivers/media/video/videobuf2-core.c | 31 +++++++++++++++++++++++++++++++ 1 file changed, 31 insertions(+) (limited to 'drivers') diff --git a/drivers/media/video/videobuf2-core.c b/drivers/media/video/videobuf2-core.c index 9005dc9991ab..979e544388cb 100644 --- a/drivers/media/video/videobuf2-core.c +++ b/drivers/media/video/videobuf2-core.c @@ -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); -- cgit v1.2.3