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Due to the wide differences between drivers regarding power management needs, the media controller does not implement power management. However, the media_entity structure includes a use_count field that media drivers can use to track the number of users of every entity for power management needs. The use_count field is owned by media drivers and must not be touched by entity drivers. Access to the field must be protected by the media device graph_mutex lock. Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Acked-by: Hans Verkuil <hverkuil@xs4all.nl> Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
147 lines
4.4 KiB
C
147 lines
4.4 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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/* 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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