On 12/09/18 20:57, Steve Longerbeam wrote:
> From: Steve Longerbeam <slongerb...@gmail.com>
>
> Forward events from a sub-device to its list of reachable video
> devices.
>
> Note this will queue the event to a video device even if there is
> no actual _enabled_ media path from the sub-device to the video device.
> So a future improvement is to skip the video device if there is no enabled
> path to it from the sub-device. The entity->pipe pointer can't be
> used for this check because in imx-media a sub-device can be a
> member to more than one streaming pipeline at a time.
You explain what you are doing, but I am missing an explanation of *why*
this is needed.
>
> Signed-off-by: Steve Longerbeam <slongerb...@gmail.com>
> ---
> drivers/staging/media/imx/imx-media-capture.c | 18 ++++++++++++++
> drivers/staging/media/imx/imx-media-dev.c | 24 +++++++++++++++++++
> 2 files changed, 42 insertions(+)
>
> diff --git a/drivers/staging/media/imx/imx-media-capture.c
> b/drivers/staging/media/imx/imx-media-capture.c
> index b37e1186eb2f..4dfbe05d203e 100644
> --- a/drivers/staging/media/imx/imx-media-capture.c
> +++ b/drivers/staging/media/imx/imx-media-capture.c
> @@ -335,6 +335,21 @@ static int capture_s_parm(struct file *file, void *fh,
> return 0;
> }
>
> +static int capture_subscribe_event(struct v4l2_fh *fh,
> + const struct v4l2_event_subscription *sub)
> +{
> + switch (sub->type) {
> + case V4L2_EVENT_IMX_FRAME_INTERVAL_ERROR:
> + return v4l2_event_subscribe(fh, sub, 0, NULL);
> + case V4L2_EVENT_SOURCE_CHANGE:
> + return v4l2_src_change_event_subscribe(fh, sub);
> + case V4L2_EVENT_CTRL:
> + return v4l2_ctrl_subscribe_event(fh, sub);
> + default:
> + return -EINVAL;
> + }
> +}
> +
> static const struct v4l2_ioctl_ops capture_ioctl_ops = {
> .vidioc_querycap = vidioc_querycap,
>
> @@ -362,6 +377,9 @@ static const struct v4l2_ioctl_ops capture_ioctl_ops = {
> .vidioc_expbuf = vb2_ioctl_expbuf,
> .vidioc_streamon = vb2_ioctl_streamon,
> .vidioc_streamoff = vb2_ioctl_streamoff,
> +
> + .vidioc_subscribe_event = capture_subscribe_event,
> + .vidioc_unsubscribe_event = v4l2_event_unsubscribe,
> };
This part of the patch adds event support to the capture device, can't this be
split up into a separate patch? It seems to be useful in its own right.
>
> /*
> diff --git a/drivers/staging/media/imx/imx-media-dev.c
> b/drivers/staging/media/imx/imx-media-dev.c
> index 4b344a4a3706..25e916562c66 100644
> --- a/drivers/staging/media/imx/imx-media-dev.c
> +++ b/drivers/staging/media/imx/imx-media-dev.c
> @@ -442,6 +442,29 @@ static const struct media_device_ops imx_media_md_ops = {
> .link_notify = imx_media_link_notify,
> };
>
> +static void imx_media_notify(struct v4l2_subdev *sd,
> + unsigned int notification,
> + void *arg)
> +{
> + struct media_entity *entity = &sd->entity;
> + int i;
> +
> + if (notification != V4L2_DEVICE_NOTIFY_EVENT)
> + return;
> +
> + for (i = 0; i < entity->num_pads; i++) {
> + struct media_pad *pad = &entity->pads[i];
> + struct imx_media_pad_vdev *pad_vdev;
> + struct list_head *pad_vdev_list;
> +
> + pad_vdev_list = to_pad_vdev_list(sd, pad->index);
> + if (!pad_vdev_list)
> + continue;
> + list_for_each_entry(pad_vdev, pad_vdev_list, list)
> + v4l2_event_queue(pad_vdev->vdev->vfd, arg);
Which events do you want to forward? E.g. forwarding control events
doesn't seem right, but other events may be useful. Are those events
also appearing on the v4l-subdevX device? And if so, should they?
> + }
> +}
> +
> static int imx_media_probe(struct platform_device *pdev)
> {
> struct device *dev = &pdev->dev;
> @@ -462,6 +485,7 @@ static int imx_media_probe(struct platform_device *pdev)
> mutex_init(&imxmd->mutex);
>
> imxmd->v4l2_dev.mdev = &imxmd->md;
> + imxmd->v4l2_dev.notify = imx_media_notify;
> strscpy(imxmd->v4l2_dev.name, "imx-media",
> sizeof(imxmd->v4l2_dev.name));
>
>
Regards,
Hans
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