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authorBhupesh Sharma <bhupesh.sharma@st.com>2013-03-28 15:11:53 +0530
committerFelipe Balbi <balbi@ti.com>2013-04-02 11:42:49 +0300
commit2f1d57069338b14fcf4765ae2c25fc377da45b1f (patch)
tree3b2cbfd148a6d5766ebd3b2b0decd6346b94e929 /drivers/usb/gadget/uvc_queue.c
parentd692522577c051058efbe9e3c8aef68a4c36e4f7 (diff)
usb: gadget/uvc: Add support for 'get_unmapped_area' for MMUless architectures
This patch adds the support for 'get_unmapped_area' in UVC gadget which is called when the 'mmap' system call is executed on MMUless architectures. Signed-off-by: Bhupesh Sharma <bhupesh.sharma@st.com> Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Diffstat (limited to 'drivers/usb/gadget/uvc_queue.c')
-rw-r--r--drivers/usb/gadget/uvc_queue.c18
1 files changed, 18 insertions, 0 deletions
diff --git a/drivers/usb/gadget/uvc_queue.c b/drivers/usb/gadget/uvc_queue.c
index 31397954c889..7ce27e35550b 100644
--- a/drivers/usb/gadget/uvc_queue.c
+++ b/drivers/usb/gadget/uvc_queue.c
@@ -232,6 +232,24 @@ static int uvc_queue_mmap(struct uvc_video_queue *queue,
return ret;
}
+#ifndef CONFIG_MMU
+/*
+ * Get unmapped area.
+ *
+ * NO-MMU arch need this function to make mmap() work correctly.
+ */
+static unsigned long uvc_queue_get_unmapped_area(struct uvc_video_queue *queue,
+ unsigned long pgoff)
+{
+ unsigned long ret;
+
+ mutex_lock(&queue->mutex);
+ ret = vb2_get_unmapped_area(&queue->queue, 0, 0, pgoff, 0);
+ mutex_unlock(&queue->mutex);
+ return ret;
+}
+#endif
+
/*
* Cancel the video buffers queue.
*

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