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- /*
- * Media entity
- *
- * Copyright (C) 2010 Nokia Corporation
- *
- * Contacts: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
- * Sakari Ailus <sakari.ailus@iki.fi>
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 2 as
- * published by the Free Software Foundation.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
- */
- #ifndef _MEDIA_ENTITY_H
- #define _MEDIA_ENTITY_H
- #include <linux/bitops.h>
- #include <linux/kernel.h>
- #include <linux/list.h>
- #include <linux/media.h>
- struct media_pipeline {
- };
- struct media_link {
- struct media_pad *source; /* Source pad */
- struct media_pad *sink; /* Sink pad */
- struct media_link *reverse; /* Link in the reverse direction */
- unsigned long flags; /* Link flags (MEDIA_LNK_FL_*) */
- };
- 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_FL_*) */
- };
- /**
- * struct media_entity_operations - Media entity operations
- * @link_setup: Notify the entity of link changes. The operation can
- * return an error, in which case link setup will be
- * cancelled. Optional.
- * @link_validate: Return whether a link is valid from the entity point of
- * view. The media_entity_pipeline_start() function
- * validates all links by calling this operation. Optional.
- */
- struct media_entity_operations {
- int (*link_setup)(struct media_entity *entity,
- const struct media_pad *local,
- const struct media_pad *remote, u32 flags);
- int (*link_validate)(struct media_link *link);
- };
- 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_ENT_T_*) */
- u32 revision; /* Entity revision, driver specific */
- unsigned long flags; /* Entity flags (MEDIA_ENT_FL_*) */
- u32 group_id; /* Entity group ID */
- u16 num_pads; /* Number of sink and source pads */
- u16 num_links; /* Number of existing links, both
- * enabled and disabled */
- u16 num_backlinks; /* Number of backlinks */
- u16 max_links; /* Maximum number of links */
- struct media_pad *pads; /* Pads array (num_pads elements) */
- struct media_link *links; /* Links array (max_links elements)*/
- const struct media_entity_operations *ops; /* Entity operations */
- /* Reference counts must never be negative, but are signed integers on
- * purpose: a simple WARN_ON(<0) check can be used to detect reference
- * count bugs that would make them negative.
- */
- int stream_count; /* Stream count for the entity. */
- int use_count; /* Use count for the entity. */
- struct media_pipeline *pipe; /* Pipeline this entity belongs to. */
- union {
- /* Node specifications */
- struct {
- u32 major;
- u32 minor;
- } dev;
- /* Sub-device specifications */
- /* Nothing needed yet */
- } info;
- };
- static inline u32 media_entity_type(struct media_entity *entity)
- {
- return entity->type & MEDIA_ENT_TYPE_MASK;
- }
- static inline u32 media_entity_subtype(struct media_entity *entity)
- {
- return entity->type & MEDIA_ENT_SUBTYPE_MASK;
- }
- #define MEDIA_ENTITY_ENUM_MAX_DEPTH 16
- #define MEDIA_ENTITY_ENUM_MAX_ID 64
- struct media_entity_graph {
- struct {
- struct media_entity *entity;
- int link;
- } stack[MEDIA_ENTITY_ENUM_MAX_DEPTH];
- DECLARE_BITMAP(entities, MEDIA_ENTITY_ENUM_MAX_ID);
- int top;
- };
- int media_entity_init(struct media_entity *entity, u16 num_pads,
- struct media_pad *pads, u16 extra_links);
- void media_entity_cleanup(struct media_entity *entity);
- int media_entity_create_link(struct media_entity *source, u16 source_pad,
- struct media_entity *sink, u16 sink_pad, u32 flags);
- void __media_entity_remove_links(struct media_entity *entity);
- void media_entity_remove_links(struct media_entity *entity);
- int __media_entity_setup_link(struct media_link *link, u32 flags);
- int media_entity_setup_link(struct media_link *link, u32 flags);
- struct media_link *media_entity_find_link(struct media_pad *source,
- struct media_pad *sink);
- struct media_pad *media_entity_remote_pad(struct media_pad *pad);
- struct media_entity *media_entity_get(struct media_entity *entity);
- void media_entity_put(struct media_entity *entity);
- void media_entity_graph_walk_start(struct media_entity_graph *graph,
- struct media_entity *entity);
- struct media_entity *
- media_entity_graph_walk_next(struct media_entity_graph *graph);
- __must_check int media_entity_pipeline_start(struct media_entity *entity,
- struct media_pipeline *pipe);
- void media_entity_pipeline_stop(struct media_entity *entity);
- #define media_entity_call(entity, operation, args...) \
- (((entity)->ops && (entity)->ops->operation) ? \
- (entity)->ops->operation((entity) , ##args) : -ENOIOCTLCMD)
- #endif
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