a5ccc48a7c
Add media entity graph traversal. The traversal follows enabled links by depth first. Traversing graph backwards is prevented by comparing the next possible entity in the graph with the previous one. Multiply connected graphs are thus not supported. Signed-off-by: Sakari Ailus <sakari.ailus@iki.fi> Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Signed-off-by: Vimarsh Zutshi <vimarsh.zutshi@gmail.com> Acked-by: Hans Verkuil <hverkuil@xs4all.nl> Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
138 lines
4.1 KiB
C
138 lines
4.1 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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#define MEDIA_ENT_TYPE_SHIFT 16
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#define MEDIA_ENT_TYPE_MASK 0x00ff0000
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#define MEDIA_ENT_SUBTYPE_MASK 0x0000ffff
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#define MEDIA_ENT_T_DEVNODE (1 << MEDIA_ENT_TYPE_SHIFT)
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#define MEDIA_ENT_T_DEVNODE_V4L (MEDIA_ENT_T_DEVNODE + 1)
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#define MEDIA_ENT_T_DEVNODE_FB (MEDIA_ENT_T_DEVNODE + 2)
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#define MEDIA_ENT_T_DEVNODE_ALSA (MEDIA_ENT_T_DEVNODE + 3)
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#define MEDIA_ENT_T_DEVNODE_DVB (MEDIA_ENT_T_DEVNODE + 4)
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#define MEDIA_ENT_T_V4L2_SUBDEV (2 << MEDIA_ENT_TYPE_SHIFT)
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#define MEDIA_ENT_T_V4L2_SUBDEV_SENSOR (MEDIA_ENT_T_V4L2_SUBDEV + 1)
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#define MEDIA_ENT_T_V4L2_SUBDEV_FLASH (MEDIA_ENT_T_V4L2_SUBDEV + 2)
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#define MEDIA_ENT_T_V4L2_SUBDEV_LENS (MEDIA_ENT_T_V4L2_SUBDEV + 3)
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#define MEDIA_ENT_FL_DEFAULT (1 << 0)
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#define MEDIA_LNK_FL_ENABLED (1 << 0)
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#define MEDIA_LNK_FL_IMMUTABLE (1 << 1)
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#define MEDIA_PAD_FL_SINK (1 << 0)
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#define MEDIA_PAD_FL_SOURCE (1 << 1)
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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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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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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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