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