[media] uvcvideo: Add support for NOMMU arch

Add support to uvc driver for NOMMU arch including add function
uvc_queue_get_unmapped_area() and make some changes in uvc_queue_mmap().
So that uvc camera can be used on nommu arch like blackfin.

Signed-off-by: Bob Liu <lliubbo@gmail.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

1 files changed, 17 insertions, 0 deletions

diff --git a/drivers/media/video/uvc/uvc_v4l2.c b/drivers/media/video/uvc/uvc_v4l2.c
index 6e8aad44c4bd..543a80395b7f 100644
--- a/drivers/media/video/uvc/uvc_v4l2.c
+++ b/drivers/media/video/uvc/uvc_v4l2.c
@@ -1114,6 +1114,20 @@ static unsigned int uvc_v4l2_poll(struct file *file, poll_table *wait)
         return uvc_queue_poll(&stream->queue, file, wait);
 }
 
+#ifndef CONFIG_MMU
+static unsigned long uvc_v4l2_get_unmapped_area(struct file *file,
+                unsigned long addr, unsigned long len, unsigned long pgoff,
+                unsigned long flags)
+{
+        struct uvc_fh *handle = file->private_data;
+        struct uvc_streaming *stream = handle->stream;
+
+        uvc_trace(UVC_TRACE_CALLS, "uvc_v4l2_get_unmapped_area\n");
+
+        return uvc_queue_get_unmapped_area(&stream->queue, pgoff);
+}
+#endif
+
 const struct v4l2_file_operations uvc_fops = {
         .owner          = THIS_MODULE,
         .open           = uvc_v4l2_open,
@@ -1122,5 +1136,8 @@ const struct v4l2_file_operations uvc_fops = {
         .read           = uvc_v4l2_read,
         .mmap           = uvc_v4l2_mmap,
         .poll           = uvc_v4l2_poll,
+#ifndef CONFIG_MMU
+        .get_unmapped_area = uvc_v4l2_get_unmapped_area,
+#endif
 };