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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>
This commit is contained in:
Bhupesh Sharma 2013-03-28 15:11:53 +05:30 committed by Felipe Balbi
parent d692522577
commit 2f1d570693
2 changed files with 33 additions and 0 deletions
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18
drivers/usb/gadget/uvc_queue.c
View File

@ -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.
*

15
drivers/usb/gadget/uvc_v4l2.c
View File

@ -339,6 +339,18 @@ uvc_v4l2_poll(struct file *file, poll_table *wait)
return uvc_queue_poll(&uvc->video.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 video_device *vdev = video_devdata(file);
struct uvc_device *uvc = video_get_drvdata(vdev);
return uvc_queue_get_unmapped_area(&uvc->video.queue, pgoff);
}
#endif
static struct v4l2_file_operations uvc_v4l2_fops = {
.owner = THIS_MODULE,
.open = uvc_v4l2_open,
@ -346,5 +358,8 @@ static struct v4l2_file_operations uvc_v4l2_fops = {
.ioctl = uvc_v4l2_ioctl,
.mmap = uvc_v4l2_mmap,
.poll = uvc_v4l2_poll,
#ifndef CONFIG_MMU
.get_unmapped_area = uvc_v4l2_get_unmapped_area,
#endif
};