| /* |
| * 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 { |
| 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 |