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Date: Fri, 8 Apr 2011 19:16:34 +0800
From: Bob Liu <lliubbo@...il.com>
To: linux-kernel@...r.kernel.org
CC: mchehab@...hat.com, hverkuil@...all.nl,
laurent.pinchart@...asonboard.com,
sakari.ailus@...well.research.nokia.com, martin_rubli@...itech.com,
jarod@...hat.com, tj@...nel.org, arnd@...db.de, fweisbec@...il.com,
agust@...x.de, gregkh@...e.de, Bob Liu <lliubbo@...il.com>
Subject: [PATCH v2] media: uvc_driver: add NO-MMU arch support
UVC driver used to have partial no-mmu arch support, but it's removed by
commit c29fcff3daafbf46d64a543c1950bbd206ad8c1c.
This patch added them back and expanded to fully support no-mmu arch, so that
uvc cameras can be used on no-mmu platforms like Blackfin.
Signed-off-by: Bob Liu <lliubbo@...il.com>
---
drivers/media/video/uvc/uvc_queue.c | 47 +++++++++++++++++++++++++++++++++++
drivers/media/video/uvc/uvc_v4l2.c | 13 +++++++++
drivers/media/video/uvc/uvcvideo.h | 6 ++++
drivers/media/video/v4l2-dev.c | 18 +++++++++++++
include/media/v4l2-dev.h | 2 +
5 files changed, 86 insertions(+), 0 deletions(-)
diff --git a/drivers/media/video/uvc/uvc_queue.c b/drivers/media/video/uvc/uvc_queue.c
index f14581b..e505afe 100644
--- a/drivers/media/video/uvc/uvc_queue.c
+++ b/drivers/media/video/uvc/uvc_queue.c
@@ -424,6 +424,7 @@ int uvc_queue_mmap(struct uvc_video_queue *queue, struct vm_area_struct *vma)
break;
}
+#ifdef CONFIG_MMU
if (i == queue->count || size != queue->buf_size) {
ret = -EINVAL;
goto done;
@@ -445,6 +446,20 @@ int uvc_queue_mmap(struct uvc_video_queue *queue, struct vm_area_struct *vma)
addr += PAGE_SIZE;
size -= PAGE_SIZE;
}
+#else
+ if (i == queue->count ||
+ PAGE_ALIGN(size) != queue->buf_size) {
+ ret = -EINVAL;
+ goto done;
+ }
+
+ /* documentation/nommu-mmap.txt */
+ vma->vm_flags |= VM_IO | VM_MAYSHARE;
+
+ addr = (unsigned long)queue->mem + buffer->buf.m.offset;
+ vma->vm_start = addr;
+ vma->vm_end = addr + queue->buf_size;
+#endif
vma->vm_ops = &uvc_vm_ops;
vma->vm_private_data = buffer;
@@ -489,6 +504,38 @@ done:
}
/*
+ * Get unmapped area.
+ *
+ * NO-MMU arch need this function to make mmap() work correctly.
+ */
+unsigned long uvc_queue_get_unmapped_area(struct uvc_video_queue *queue,
+ unsigned long addr, unsigned long len, unsigned long pgoff)
+{
+ struct uvc_buffer *buffer;
+ unsigned int i;
+ int ret = 0;
+
+ mutex_lock(&queue->mutex);
+ for (i = 0; i < queue->count; ++i) {
+ buffer = &queue->buffer[i];
+ if ((buffer->buf.m.offset >> PAGE_SHIFT) == pgoff)
+ break;
+ }
+
+ if (i == queue->count ||
+ PAGE_ALIGN(len) != queue->buf_size) {
+ ret = -EINVAL;
+ goto done;
+ }
+
+ addr = (unsigned long)queue->mem + buffer->buf.m.offset;
+ ret = addr;
+done:
+ mutex_unlock(&queue->mutex);
+ return ret;
+}
+
+/*
* Enable or disable the video buffers queue.
*
* The queue must be enabled before starting video acquisition and must be
diff --git a/drivers/media/video/uvc/uvc_v4l2.c b/drivers/media/video/uvc/uvc_v4l2.c
index 9005a8d..9efab61 100644
--- a/drivers/media/video/uvc/uvc_v4l2.c
+++ b/drivers/media/video/uvc/uvc_v4l2.c
@@ -1081,6 +1081,18 @@ static unsigned int uvc_v4l2_poll(struct file *file, poll_table *wait)
return uvc_queue_poll(&stream->queue, file, wait);
}
+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, addr, len, pgoff);
+}
+
const struct v4l2_file_operations uvc_fops = {
.owner = THIS_MODULE,
.open = uvc_v4l2_open,
@@ -1089,5 +1101,6 @@ const struct v4l2_file_operations uvc_fops = {
.read = uvc_v4l2_read,
.mmap = uvc_v4l2_mmap,
.poll = uvc_v4l2_poll,
+ .get_unmapped_area = uvc_v4l2_get_unmapped_area,
};
diff --git a/drivers/media/video/uvc/uvcvideo.h b/drivers/media/video/uvc/uvcvideo.h
index 45f01e7..48a2378 100644
--- a/drivers/media/video/uvc/uvcvideo.h
+++ b/drivers/media/video/uvc/uvcvideo.h
@@ -580,6 +580,12 @@ extern int uvc_queue_mmap(struct uvc_video_queue *queue,
struct vm_area_struct *vma);
extern unsigned int uvc_queue_poll(struct uvc_video_queue *queue,
struct file *file, poll_table *wait);
+#ifdef CONFIG_MMU
+#define uvc_queue_get_unmapped_area NULL
+#else
+extern unsigned long uvc_queue_get_unmapped_area(struct uvc_video_queue *queue,
+ unsigned long addr, unsigned long len, unsigned long pgoff);
+#endif
extern int uvc_queue_allocated(struct uvc_video_queue *queue);
static inline int uvc_queue_streaming(struct uvc_video_queue *queue)
{
diff --git a/drivers/media/video/v4l2-dev.c b/drivers/media/video/v4l2-dev.c
index 498e674..221e73f 100644
--- a/drivers/media/video/v4l2-dev.c
+++ b/drivers/media/video/v4l2-dev.c
@@ -368,6 +368,23 @@ static int v4l2_mmap(struct file *filp, struct vm_area_struct *vm)
return ret;
}
+#ifdef CONFIG_MMU
+#define v4l2_get_unmapped_area NULL
+#else
+static unsigned long v4l2_get_unmapped_area(struct file *filp,
+ unsigned long addr, unsigned long len, unsigned long pgoff,
+ unsigned long flags)
+{
+ struct video_device *vdev = video_devdata(filp);
+
+ if (!vdev->fops->get_unmapped_area)
+ return -ENOSYS;
+ if (!video_is_registered(vdev))
+ return -ENODEV;
+ return vdev->fops->get_unmapped_area(filp, addr, len, pgoff, flags);
+}
+#endif
+
/* Override for the open function */
static int v4l2_open(struct inode *inode, struct file *filp)
{
@@ -452,6 +469,7 @@ static const struct file_operations v4l2_fops = {
.write = v4l2_write,
.open = v4l2_open,
.mmap = v4l2_mmap,
+ .get_unmapped_area = v4l2_get_unmapped_area,
.unlocked_ioctl = v4l2_ioctl,
#ifdef CONFIG_COMPAT
.compat_ioctl = v4l2_compat_ioctl32,
diff --git a/include/media/v4l2-dev.h b/include/media/v4l2-dev.h
index 8266d5a..0616a43 100644
--- a/include/media/v4l2-dev.h
+++ b/include/media/v4l2-dev.h
@@ -63,6 +63,8 @@ struct v4l2_file_operations {
long (*ioctl) (struct file *, unsigned int, unsigned long);
long (*unlocked_ioctl) (struct file *, unsigned int, unsigned long);
int (*mmap) (struct file *, struct vm_area_struct *);
+ unsigned long (*get_unmapped_area) (struct file *, unsigned long,
+ unsigned long, unsigned long, unsigned long);
int (*open) (struct file *);
int (*release) (struct file *);
};
--
1.6.3.3
--
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