Hi Mauro,
Thank you for the patch.
On Sunday 06 September 2015 09:03:13 Mauro Carvalho Chehab wrote:
> V4L2 device (and subdevice) nodes should create an interface, if the
> Media Controller support is enabled.
>
> Please notice that radio devices should not create an entity, as radio
> input/output is either via wires or via ALSA.
I'd go one step further, video nodes should not create an entity, ever. This
was one of the design principles behind the MC rework. We'll need to patch
drivers to create DMA engine entity explicitly, possibly through a helper
function (maybe a function to create and initialize a DMA engine entity based
on a struct video_device). This can of course be done on a separate patch, but
removing the entity field from struct video_device should be part of the
series.
> Signed-off-by: Mauro Carvalho Chehab <mchehab@xxxxxxxxxxxxxxx>
>
> diff --git a/drivers/media/v4l2-core/v4l2-dev.c
> b/drivers/media/v4l2-core/v4l2-dev.c index 44b330589787..07123dd569c4
> 100644
> --- a/drivers/media/v4l2-core/v4l2-dev.c
> +++ b/drivers/media/v4l2-core/v4l2-dev.c
> @@ -194,9 +194,12 @@ static void v4l2_device_release(struct device *cd)
> mutex_unlock(&videodev_lock);
>
> #if defined(CONFIG_MEDIA_CONTROLLER)
> - if (v4l2_dev->mdev &&
> - vdev->vfl_type != VFL_TYPE_SUBDEV)
> - media_device_unregister_entity(&vdev->entity);
> + if (v4l2_dev->mdev) {
> + /* Remove interfaces and interface links */
> + media_devnode_remove(vdev->intf_devnode);
> + if (vdev->entity.type != MEDIA_ENT_T_UNKNOWN)
> + media_device_unregister_entity(&vdev->entity);
> + }
> #endif
>
> /* Do not call v4l2_device_put if there is no release callback set.
> @@ -713,6 +716,92 @@ static void determine_valid_ioctls(struct video_device
> *vdev) BASE_VIDIOC_PRIVATE);
> }
>
> +
Extra blank line.
> +static int video_register_media_controller(struct video_device *vdev, int
> type)
> +{
> +#if defined(CONFIG_MEDIA_CONTROLLER)
> + u32 intf_type;
> + int ret;
> +
> + if (!vdev->v4l2_dev->mdev)
> + return 0;
> +
> + vdev->entity.type = MEDIA_ENT_T_UNKNOWN;
> +
> + switch (type) {
> + case VFL_TYPE_GRABBER:
> + intf_type = MEDIA_INTF_T_V4L_VIDEO;
> + vdev->entity.type = MEDIA_ENT_T_V4L2_VIDEO;
> + break;
> + case VFL_TYPE_VBI:
> + intf_type = MEDIA_INTF_T_V4L_VBI;
> + vdev->entity.type = MEDIA_ENT_T_V4L2_VBI;
> + break;
> + case VFL_TYPE_SDR:
> + intf_type = MEDIA_INTF_T_V4L_SWRADIO;
> + vdev->entity.type = MEDIA_ENT_T_V4L2_SWRADIO;
> + break;
> + case VFL_TYPE_RADIO:
> + intf_type = MEDIA_INTF_T_V4L_RADIO;
> + /*
> + * Radio doesn't have an entity at the V4L2 side to represent
> + * radio input or output. Instead, the audio input/output goes
> + * via either physical wires or ALSA.
> + */
> + break;
> + case VFL_TYPE_SUBDEV:
> + intf_type = MEDIA_INTF_T_V4L_SUBDEV;
> + /* Entity will be created via v4l2_device_register_subdev() */
> + break;
> + default:
> + return 0;
> + }
> +
> + if (vdev->entity.type != MEDIA_ENT_T_UNKNOWN) {
> + vdev->entity.name = vdev->name;
> +
> + /* Needed just for backward compatibility with legacy MC API */
> + vdev->entity.info.dev.major = VIDEO_MAJOR;
> + vdev->entity.info.dev.minor = vdev->minor;
> +
> + ret = media_device_register_entity(vdev->v4l2_dev->mdev,
> + &vdev->entity);
> + if (ret < 0) {
> + printk(KERN_WARNING
> + "%s: media_device_register_entity failed\n",
> + __func__);
> + return ret;
> + }
> + }
> +
> + vdev->intf_devnode = media_devnode_create(vdev->v4l2_dev->mdev,
> + intf_type,
> + 0, VIDEO_MAJOR,
> + vdev->minor,
> + GFP_KERNEL);
> + if (!vdev->intf_devnode) {
> + media_device_unregister_entity(&vdev->entity);
> + return -ENOMEM;
> + }
> +
> + if (vdev->entity.type != MEDIA_ENT_T_UNKNOWN) {
> + struct media_link *link;
> +
> + link = media_create_intf_link(&vdev->entity,
> + &vdev->intf_devnode->intf, 0);
> + if (!link) {
> + media_devnode_remove(vdev->intf_devnode);
> + media_device_unregister_entity(&vdev->entity);
> + return -ENOMEM;
> + }
> + }
> +
> + /* FIXME: how to create the other interface links? */
If they're needed (and I'm still not sure they are) they should be created by
drivers, possibly with the help of helper functions.
> +
> +#endif
> + return 0;
> +}
> +
> /**
> * __video_register_device - register video4linux devices
> * @vdev: video device structure we want to register
> @@ -908,22 +997,9 @@ int __video_register_device(struct video_device *vdev,
> int type, int nr, /* Increase v4l2_device refcount */
> v4l2_device_get(vdev->v4l2_dev);
>
> -#if defined(CONFIG_MEDIA_CONTROLLER)
> /* Part 5: Register the entity. */
> - if (vdev->v4l2_dev->mdev &&
> - vdev->vfl_type != VFL_TYPE_SUBDEV) {
> - vdev->entity.type = MEDIA_ENT_T_V4L2_VIDEO;
> - vdev->entity.name = vdev->name;
> - vdev->entity.info.dev.major = VIDEO_MAJOR;
> - vdev->entity.info.dev.minor = vdev->minor;
> - ret = media_device_register_entity(vdev->v4l2_dev->mdev,
> - &vdev->entity);
> - if (ret < 0)
> - printk(KERN_WARNING
> - "%s: media_device_register_entity failed\n",
> - __func__);
> - }
> -#endif
> + ret = video_register_media_controller(vdev, type);
> +
> /* Part 6: Activate this minor. The char device can now be used. */
> set_bit(V4L2_FL_REGISTERED, &vdev->flags);
>
> diff --git a/drivers/media/v4l2-core/v4l2-device.c
> b/drivers/media/v4l2-core/v4l2-device.c index 5b0a30b9252b..e788a085ba96
> 100644
> --- a/drivers/media/v4l2-core/v4l2-device.c
> +++ b/drivers/media/v4l2-core/v4l2-device.c
> @@ -249,6 +249,17 @@ int v4l2_device_register_subdev_nodes(struct
> v4l2_device *v4l2_dev) #if defined(CONFIG_MEDIA_CONTROLLER)
> sd->entity.info.dev.major = VIDEO_MAJOR;
> sd->entity.info.dev.minor = vdev->minor;
> +
> + /* Interface is created by __video_register_device() */
> + if (vdev->v4l2_dev->mdev) {
> + struct media_link *link;
> +
> + link = media_create_intf_link(&sd->entity,
> + &vdev->intf_devnode->intf,
> + 0);
> + if (!link)
> + goto clean_up;
> + }
> #endif
> sd->devnode = vdev;
> }
> @@ -285,7 +296,10 @@ void v4l2_device_unregister_subdev(struct v4l2_subdev
> *sd)
>
> #if defined(CONFIG_MEDIA_CONTROLLER)
> if (v4l2_dev->mdev) {
> - media_entity_remove_links(&sd->entity);
> + /*
> + * No need to explicitly remove links, as both pads and
> + * links are removed by the function below, in the right order
> + */
> media_device_unregister_entity(&sd->entity);
> }
> #endif
> diff --git a/include/media/v4l2-dev.h b/include/media/v4l2-dev.h
> index acbcd2f5fe7f..eeabf20e87a6 100644
> --- a/include/media/v4l2-dev.h
> +++ b/include/media/v4l2-dev.h
> @@ -86,6 +86,7 @@ struct video_device
> {
> #if defined(CONFIG_MEDIA_CONTROLLER)
> struct media_entity entity;
> + struct media_intf_devnode *intf_devnode;
> #endif
> /* device ops */
> const struct v4l2_file_operations *fops;
--
Regards,
Laurent Pinchart
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