On Thursday 29 July 2010 18:06:36 Laurent Pinchart wrote:
<snip>
> diff --git a/include/media/media-device.h b/include/media/media-device.h
> index bd559b0..ac96847 100644
> --- a/include/media/media-device.h
> +++ b/include/media/media-device.h
> @@ -23,8 +23,10 @@
>
> #include <linux/device.h>
> #include <linux/list.h>
> +#include <linux/spinlock.h>
>
> #include <media/media-devnode.h>
> +#include <media/media-entity.h>
>
> /* Each instance of a media device should create the media_device struct,
> * either stand-alone or embedded in a larger struct.
> @@ -40,9 +42,23 @@ struct media_device {
> */
> struct device *dev;
> struct media_devnode devnode;
> +
> + u32 entity_id;
> + struct list_head entities;
> +
> + /* Protects the entities list */
> + spinlock_t lock;
> };
>
> int __must_check media_device_register(struct media_device *mdev);
> void media_device_unregister(struct media_device *mdev);
>
> +int __must_check media_device_register_entity(struct media_device *mdev,
> + struct media_entity *entity);
> +void media_device_unregister_entity(struct media_entity *entity);
> +
> +/* Iterate over all entities. */
> +#define media_device_for_each_entity(entity, mdev) \
> + list_for_each_entry(entity, &(mdev)->entities, list)
> +
> #endif
> diff --git a/include/media/media-entity.h b/include/media/media-entity.h
> new file mode 100644
> index 0000000..37a25bf
> --- /dev/null
> +++ b/include/media/media-entity.h
> @@ -0,0 +1,85 @@
> +#ifndef _MEDIA_ENTITY_H
> +#define _MEDIA_ENTITY_H
> +
> +#include <linux/list.h>
> +
> +#define MEDIA_ENTITY_TYPE_NODE (1 << 16)
I agree with Sakari that '16' should be a define.
> +#define MEDIA_ENTITY_TYPE_NODE_V4L (MEDIA_ENTITY_TYPE_NODE + 1)
> +#define MEDIA_ENTITY_TYPE_NODE_FB (MEDIA_ENTITY_TYPE_NODE + 2)
> +#define MEDIA_ENTITY_TYPE_NODE_ALSA (MEDIA_ENTITY_TYPE_NODE + 3)
> +#define MEDIA_ENTITY_TYPE_NODE_DVB (MEDIA_ENTITY_TYPE_NODE + 4)
> +
> +#define MEDIA_ENTITY_TYPE_SUBDEV (2 << 16)
> +#define MEDIA_ENTITY_TYPE_SUBDEV_VID_DECODER (MEDIA_ENTITY_TYPE_SUBDEV + 1)
> +#define MEDIA_ENTITY_TYPE_SUBDEV_VID_ENCODER (MEDIA_ENTITY_TYPE_SUBDEV + 2)
> +#define MEDIA_ENTITY_TYPE_SUBDEV_MISC
> (MEDIA_ENTITY_TYPE_SUBDEV + 3)
> +
> +#define MEDIA_LINK_FLAG_ACTIVE (1 << 0)
> +#define MEDIA_LINK_FLAG_IMMUTABLE (1 << 1)
> +
> +#define MEDIA_PAD_FLAG_INPUT (1 << 0)
> +#define MEDIA_PAD_FLAG_OUTPUT (1 << 1)
> +
> +struct media_link {
> + struct media_pad *source; /* Source pad */
> + struct media_pad *sink; /* Sink pad */
> + struct media_link *other; /* Link in the reverse direction */
Why not rename 'other' to 'back' or 'backlink'? 'other' is not a good name IMHO.
> + unsigned long flags; /* Link flags (MEDIA_LINK_FLAG_*) */
> +};
> +
> +struct media_pad {
> + struct media_entity *entity; /* Entity this pad belongs to */
> + u16 index; /* Pad index in the entity pads array */
> + unsigned long flags; /* Pad flags (MEDIA_PAD_FLAG_*) */
> +};
> +
> +struct media_entity {
> + struct list_head list;
> + struct media_device *parent; /* Media device this entity belongs to*/
> + u32 id; /* Entity ID, unique in the parent media
> + * device context */
> + const char *name; /* Entity name */
> + u32 type; /* Entity type (MEDIA_ENTITY_TYPE_*) */
> +
> + u8 num_pads; /* Number of input and output pads */
> + u8 num_links; /* Number of existing links, both active
> + * and inactive */
> + u8 num_backlinks; /* Number of backlinks */
> + u8 max_links; /* Maximum number of links */
> +
> + struct media_pad *pads; /* Pads array (num_pads elements) */
> + struct media_link *links; /* Links array (max_links elements)*/
> +
> + union {
> + /* Node specifications */
> + struct {
> + u32 major;
> + u32 minor;
> + } v4l;
> + struct {
> + u32 major;
> + u32 minor;
> + } fb;
> + int alsa;
> + int dvb;
> +
> + /* Sub-device specifications */
> + /* Nothing needed yet */
> + };
> +};
> +
> +#define MEDIA_ENTITY_TYPE_MASK 0xffff0000
> +#define MEDIA_ENTITY_SUBTYPE_MASK 0x0000ffff
> +
> +#define media_entity_type(entity) \
> + ((entity)->type & MEDIA_ENTITY_TYPE_MASK)
> +#define media_entity_subtype(entity) \
> + ((entity)->type & MEDIA_ENTITY_SUBTYPE_MASK)
Make these inline functions to ensure correct typechecking.
Since bit 31 of the entity ID is reserved for MEDIA_ENTITY_ID_FLAG_NEXT you
probably should change the TYPE_MASK to 0x7fff0000. Actually, I would
change the type mask to 0x00ff0000, that way all top 8 bits are available
for the future.
> +
> +int media_entity_init(struct media_entity *entity, u8 num_pads,
> + struct media_pad *pads, u8 extra_links);
> +void media_entity_cleanup(struct media_entity *entity);
> +int media_entity_create_link(struct media_entity *source, u8 source_pad,
> + struct media_entity *sink, u8 sink_pad, u32 flags);
> +
> +#endif
>
Regards,
Hans
--
Hans Verkuil - video4linux developer - sponsored by TANDBERG, part of Cisco
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