On 01/26/2015 01:47 PM, Mauro Carvalho Chehab wrote:
> The previous provision for DVB media controller support were to
> define an ID (likely meaning the adapter number) for the DVB
> devnodes.
>
> This is just plain wrong. Just like V4L, DVB devices (and ALSA,
> or whatever) are identified via a (major, minor) tuple.
>
> This is enough to uniquely identify a devnode, no matter what
> API it implements.
>
> So, before we go too far, let's mark the old v4l, dvb and alsa
> "devnode" info as deprecated, and just call it as "dev".
>
> As we don't want to break compilation on already existing apps,
> let's just keep the old definitions as-is, adding a note that
> those are deprecated at media-entity.h.
>
> Signed-off-by: Mauro Carvalho Chehab <[email protected]>
>
> diff --git a/drivers/media/v4l2-core/v4l2-dev.c
> b/drivers/media/v4l2-core/v4l2-dev.c
> index 86bb93fd7db8..d89d5cb465d9 100644
> --- a/drivers/media/v4l2-core/v4l2-dev.c
> +++ b/drivers/media/v4l2-core/v4l2-dev.c
> @@ -943,8 +943,8 @@ int __video_register_device(struct video_device *vdev,
> int type, int nr,
> vdev->vfl_type != VFL_TYPE_SUBDEV) {
> vdev->entity.type = MEDIA_ENT_T_DEVNODE_V4L;
> vdev->entity.name = vdev->name;
> - vdev->entity.info.v4l.major = VIDEO_MAJOR;
> - vdev->entity.info.v4l.minor = vdev->minor;
> + 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)
> diff --git a/drivers/media/v4l2-core/v4l2-device.c
> b/drivers/media/v4l2-core/v4l2-device.c
> index 015f92aab44a..204cc67c84e8 100644
> --- a/drivers/media/v4l2-core/v4l2-device.c
> +++ b/drivers/media/v4l2-core/v4l2-device.c
> @@ -248,8 +248,8 @@ int v4l2_device_register_subdev_nodes(struct v4l2_device
> *v4l2_dev)
> goto clean_up;
> }
> #if defined(CONFIG_MEDIA_CONTROLLER)
> - sd->entity.info.v4l.major = VIDEO_MAJOR;
> - sd->entity.info.v4l.minor = vdev->minor;
> + sd->entity.info.dev.major = VIDEO_MAJOR;
> + sd->entity.info.dev.minor = vdev->minor;
> #endif
> sd->devnode = vdev;
> }
> diff --git a/include/media/media-entity.h b/include/media/media-entity.h
> index e00459185d20..d6d74bcfe183 100644
> --- a/include/media/media-entity.h
> +++ b/include/media/media-entity.h
> @@ -87,17 +87,7 @@ struct media_entity {
> struct {
> u32 major;
> u32 minor;
> - } v4l;
> - struct {
> - u32 major;
> - u32 minor;
> - } fb;
> - struct {
> - u32 card;
> - u32 device;
> - u32 subdevice;
> - } alsa;
I don't think the alsa entity information can be replaced by major/minor.
In particular you will loose the subdevice information which you need as
well. In addition, alsa devices are almost never referenced via major and
minor numbers, but always by card/device/subdevice numbers.
> - int dvb;
> + } dev;
>
> /* Sub-device specifications */
> /* Nothing needed yet */
> diff --git a/include/uapi/linux/media.h b/include/uapi/linux/media.h
> index d847c760e8f0..418f4fec391a 100644
> --- a/include/uapi/linux/media.h
> +++ b/include/uapi/linux/media.h
> @@ -78,6 +78,20 @@ struct media_entity_desc {
> struct {
> __u32 major;
> __u32 minor;
> + } dev;
> +
> +#if 1
> + /*
> + * DEPRECATED: previous node specifications. Kept just to
> + * avoid breaking compilation, but media_entity_desc.dev
> + * should be used instead. In particular, alsa and dvb
> + * fields below are wrong: for all devnodes, there should
> + * be just major/minor inside the struct, as this is enough
> + * to represent any devnode, no matter what type.
> + */
> + struct {
> + __u32 major;
> + __u32 minor;
> } v4l;
> struct {
> __u32 major;
> @@ -89,6 +103,7 @@ struct media_entity_desc {
> __u32 subdevice;
> } alsa;
> int dvb;
I wouldn't merge all the v4l/fb/etc. structs into one struct. That will make it
difficult in the future if you need to add a field for e.g. v4l entities.
So I would keep the v4l, fb and alsa structs, and just add a new struct for
dvb. I wonder if the dvb field can't just be replaced since I doubt anyone is
using it. And even if someone does, then it can't be right since a single
int isn't enough and never worked anyway.
Regards,
Hans
> +#endif
>
> /* Sub-device specifications */
> /* Nothing needed yet */
>
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