diff options
| author | Scott Jiang | 2011-09-21 09:25:23 -0300 |
|---|---|---|
| committer | Mauro Carvalho Chehab | 2011-11-03 18:29:13 -0200 |
| commit | 6f524ec156ba31a18425fad9dd1287be0701d9d1 (patch) | |
| tree | f9264cae6e442d9d346dc6cc73cb749c62be53a0 /drivers/media/video | |
| parent | bfa8dd3a05248457fce18712e7bc0499030b3100 (diff) | |
[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 <scott.jiang.linux@gmail.com>
Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
Signed-off-by: Sylwester Nawrocki <s.nawrocki@samsung.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
Diffstat (limited to 'drivers/media/video')
| -rw-r--r-- | drivers/media/video/videobuf2-core.c | 31 |
1 files changed, 31 insertions, 0 deletions
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); |