1651333b09
Create the following two ioctls and implement them at the media device level to enumerate entities, pads and links. - MEDIA_IOC_ENUM_ENTITIES: Enumerate entities and their properties - MEDIA_IOC_ENUM_LINKS: Enumerate all pads and links for a given entity Entity IDs can be non-contiguous. Userspace applications should enumerate entities using the MEDIA_ENT_ID_FLAG_NEXT flag. When the flag is set in the entity ID, the MEDIA_IOC_ENUM_ENTITIES will return the next entity with an ID bigger than the requested one. Only forward links that originate at one of the entity's source pads are returned during the enumeration process. Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Signed-off-by: Sakari Ailus <sakari.ailus@iki.fi> Acked-by: Hans Verkuil <hverkuil@xs4all.nl> Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
125 lines
3.6 KiB
C
125 lines
3.6 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/list.h>
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#include <linux/media.h>
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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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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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/* 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 use_count; /* Use count for the entity. */
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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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} v4l;
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struct {
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u32 major;
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u32 minor;
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} fb;
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struct {
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u32 card;
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u32 device;
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u32 subdevice;
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} alsa;
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int dvb;
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/* Sub-device specifications */
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/* Nothing needed yet */
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};
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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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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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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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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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#endif
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