From: Hans Verkuil <hans.verkuil@xxxxxxxxx>
The v4l2_device_req_queue() function is a helper that can be used
as the req_queue callback in simple cases: it will walk over all
registered video_devices and call vb2_qbuf_request() for each video
device.
Signed-off-by: Hans Verkuil <hans.verkuil@xxxxxxxxx>
---
drivers/media/v4l2-core/v4l2-device.c | 25 +++++++++++++++++++++++++
include/media/v4l2-device.h | 3 +++
2 files changed, 28 insertions(+)
diff --git a/drivers/media/v4l2-core/v4l2-device.c b/drivers/media/v4l2-core/v4l2-device.c
index cdb2d72..5f073ad 100644
--- a/drivers/media/v4l2-core/v4l2-device.c
+++ b/drivers/media/v4l2-core/v4l2-device.c
@@ -29,6 +29,7 @@
#include <linux/videodev2.h>
#include <media/v4l2-device.h>
#include <media/v4l2-ctrls.h>
+#include <media/videobuf2-core.h>
int v4l2_device_register(struct device *dev, struct v4l2_device *v4l2_dev)
{
@@ -295,3 +296,27 @@ void v4l2_device_unregister_subdev(struct v4l2_subdev *sd)
module_put(sd->owner);
}
EXPORT_SYMBOL_GPL(v4l2_device_unregister_subdev);
+
+int v4l2_device_req_queue(struct v4l2_device *v4l2_dev, u16 request)
+{
+ struct video_device *vdev;
+ struct video_device *tmp;
+ int err;
+
+ if (request == 0)
+ return -EINVAL;
+
+ list_for_each_entry_safe(vdev, tmp, &v4l2_dev->vdevs, list) {
+ if (vdev->queue == NULL || !vdev->queue->allow_requests)
+ continue;
+ if (vdev->lock && mutex_lock_interruptible(vdev->lock))
+ return -ERESTARTSYS;
+ err = vb2_qbuf_request(vdev->queue, request, NULL);
+ if (vdev->lock)
+ mutex_unlock(vdev->lock);
+ if (err)
+ return err;
+ }
+ return 0;
+}
+EXPORT_SYMBOL_GPL(v4l2_device_req_queue);
diff --git a/include/media/v4l2-device.h b/include/media/v4l2-device.h
index 6484e54..3595475 100644
--- a/include/media/v4l2-device.h
+++ b/include/media/v4l2-device.h
@@ -130,6 +130,9 @@ static inline void v4l2_subdev_notify(struct v4l2_subdev *sd,
sd->v4l2_dev->notify(sd, notification, arg);
}
+/* For each registered video_device struct call vb2_qbuf_request(). */
+int v4l2_device_req_queue(struct v4l2_device *v4l2_dev, u16 request);
+
/* Iterate over all subdevs. */
#define v4l2_device_for_each_subdev(sd, v4l2_dev) \
list_for_each_entry(sd, &(v4l2_dev)->subdevs, list)
--
2.1.4
--
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