/*
* 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>
/* Enums used internally at the media controller to represent graphs */
/**
* enum media_gobj_type - type of a graph object
*
* @MEDIA_GRAPH_ENTITY: Identify a media entity
* @MEDIA_GRAPH_PAD: Identify a media pad
* @MEDIA_GRAPH_LINK: Identify a media link
* @MEDIA_GRAPH_INTF_DEVNODE: Identify a media Kernel API interface via
* a device node
*/
enum media_gobj_type {
MEDIA_GRAPH_ENTITY,
MEDIA_GRAPH_PAD,
MEDIA_GRAPH_LINK,
MEDIA_GRAPH_INTF_DEVNODE,
};
#define MEDIA_BITS_PER_TYPE 8
#define MEDIA_BITS_PER_LOCAL_ID (32 - MEDIA_BITS_PER_TYPE)
#define MEDIA_LOCAL_ID_MASK GENMASK(MEDIA_BITS_PER_LOCAL_ID - 1, 0)
/* Structs to represent the objects that belong to a media graph */
/**
* struct media_gobj - Define a graph object.
*
* @mdev: Pointer to the struct media_device that owns the object
* @id: Non-zero object ID identifier. The ID should be unique
* inside a media_device, as it is composed by
* MEDIA_BITS_PER_TYPE to store the type plus
* MEDIA_BITS_PER_LOCAL_ID to store a per-type ID
* (called as "local ID").
* @list: List entry stored in one of the per-type mdev object lists
*
* All objects on the media graph should have this struct embedded
*/
struct media_gobj {
struct media_device *mdev;
u32 id;
struct list_head list;
};
struct media_pipeline {
};
/**
* struct media_link - A link object part of a media graph.
*
* @graph_obj: Embedded structure containing the media object common data
* @list: Linked list associated with an entity or an interface that
* owns the link.
* @gobj0: Part of a union. Used to get the pointer for the first
* graph_object of the link.
* @source: Part of a union. Used only if the first object (gobj0) is
* a pad. In that case, it represents the source pad.
* @intf: Part of a union. Used only if the first object (gobj0) is
* an interface.
* @gobj1: Part of a union. Used to get the pointer for the second
* graph_object of the link.
* @source: Part of a union. Used only if the second object (gobj1) is
* a pad. In that case, it represents the sink pad.
* @entity: Part of a union. Used only if the second object (gobj1) is
* an entity.
* @reverse: Pointer to the link for the reverse direction of a pad to pad
* link.
* @flags: Link flags, as defined in uapi/media.h (MEDIA_LNK_FL_*)
* @is_backlink: Indicate if the link is a backlink.
*/
struct media_link {
struct media_gobj graph_obj;
struct list_head list;
union {
struct media_gobj *gobj0;
struct media_pad *source;
struct media_interface *intf;
};
union {
struct media_gobj *gobj1;
struct media_pad *sink;
struct media_entity *entity;
};
struct media_link *reverse;
unsigned long flags;
bool is_backlink;
};
/**
* struct media_pad - A media pad graph object.
*
* @graph_obj: Embedded structure containing the media object common data
* @entity: Entity this pad belongs to
* @index: Pad index in the entity pads array, numbered from 0 to n
* @flags: Pad flags, as defined in uapi/media.h (MEDIA_PAD_FL_*)
*/
struct media_pad {
struct media_gobj graph_obj; /* must be first field in struct */
struct media_entity *entity;
u16 index;
unsigned long flags;
};
/**
* struct media_entity_operations - Media entity operations
* @link_setup: Notify the entity of link changes. The operation can
* return an error, in which case link setup will be
* cancelled. Optional.
* @link_validate: Return whether a link is valid from the entity point of
* view. The media_entity_pipeline_start() function
* validates all links by calling this operation. Optional.
*/
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 - A media entity graph object.
*
* @graph_obj: Embedded structure containing the media object common data.
* @name: Entity name.
* @function: Entity main function, as defined in uapi/media.h
* (MEDIA_ENT_F_*)
* @flags: Entity flags, as defined in uapi/media.h (MEDIA_ENT_FL_*)
* @num_pads: Number of sink and source pads.
* @num_links: Total number of links, forward and back, enabled and disabled.
* @num_backlinks: Number of backlinks
* @pads: Pads array with the size defined by @num_pads.
* @links: List of data links.
* @ops: Entity operations.
* @stream_count: Stream count for the entity.
* @use_count: Use count for the entity.
* @pipe: Pipeline this entity belongs to.
* @info: Union with devnode information. Kept just for backward
* compatibility.
* @major: Devnode major number (zero if not applicable). Kept just
* for backward compatibility.
* @minor: Devnode minor number (zero if not applicable). Kept just
* for backward compatibility.
*
* NOTE: @stream_count and @use_count 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.
*/
struct media_entity {
struct media_gobj graph_obj; /* must be first field in struct */
const char *name;
u32 function;
unsigned long flags;
u16 num_pads;
u16 num_links;
u16 num_backlinks;
struct media_pad *pads;
struct list_head links;
const struct media_entity_operations *ops;
/* 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;
int use_count;
struct media_pipeline *pipe;
union {
struct {
u32 major;
u32 minor;
} dev;
} info;
};
/**
* struct media_interface - A media interface graph object.
*
* @graph_obj: embedded graph object
* @links: List of links pointing to graph entities
* @type: Type of the interface as defined in the
* uapi/media/media.h header, e. g.
* MEDIA_INTF_T_*
* @flags: Interface flags as defined in uapi/media/media.h
*/
struct media_interface {
struct media_gobj graph_obj;
struct list_head links;
u32 type;
u32 flags;
};
/**
* struct media_intf_devnode - A media interface via a device node.
*
* @intf: embedded interface object
* @major: Major number of a device node
* @minor: Minor number of a device node
*/
struct media_intf_devnode {
struct media_interface intf;
/* Should match the fields at media_v2_intf_devnode */
u32 major;
u32 minor;
};
static inline u32 media_entity_id(struct media_entity *entity)
{
return entity->graph_obj.id;
}
static inline enum media_gobj_type media_type(struct media_gobj *gobj)
{
return gobj->id >> MEDIA_BITS_PER_LOCAL_ID;
}
static inline u32 media_localid(struct media_gobj *gobj)
{
return gobj->id & MEDIA_LOCAL_ID_MASK;
}
static inline u32 media_gobj_gen_id(enum media_gobj_type type, u32 local_id)
{
u32 id;
id = type << MEDIA_BITS_PER_LOCAL_ID;
id |= local_id & MEDIA_LOCAL_ID_MASK;
return id;
}
static inline bool is_media_entity_v4l2_io(struct media_entity *entity)
{
if (!entity)
return false;
switch (entity->function) {
case MEDIA_ENT_F_IO_V4L:
case MEDIA_ENT_F_IO_VBI:
case MEDIA_ENT_F_IO_SWRADIO:
return true;
default:
return false;
}
}
static inline bool is_media_entity_v4l2_subdev(struct media_entity *entity)
{
if (!entity)
return false;
switch (entity->function) {
case MEDIA_ENT_F_V4L2_SUBDEV_UNKNOWN:
case MEDIA_ENT_F_CAM_SENSOR:
case MEDIA_ENT_F_FLASH:
case MEDIA_ENT_F_LENS:
case MEDIA_ENT_F_ATV_DECODER:
case MEDIA_ENT_F_TUNER:
return true;
default:
return false;
}
}
#define MEDIA_ENTITY_ENUM_MAX_DEPTH 16
#define MEDIA_ENTITY_ENUM_MAX_ID 64
/*
* The number of pads can't be bigger than the number of entities,
* as the worse-case scenario is to have one entity linked up to
* MEDIA_ENTITY_ENUM_MAX_ID - 1 entities.
*/
#define MEDIA_ENTITY_MAX_PADS (MEDIA_ENTITY_ENUM_MAX_ID - 1)
struct media_entity_graph {
struct {
struct media_entity *entity;
struct list_head *link;
} stack[MEDIA_ENTITY_ENUM_MAX_DEPTH];
DECLARE_BITMAP(entities, MEDIA_ENTITY_ENUM_MAX_ID);
int top;
};
#define gobj_to_entity(gobj) \
container_of(gobj, struct media_entity, graph_obj)
#define gobj_to_pad(gobj) \
container_of(gobj, struct media_pad, graph_obj)
#define gobj_to_link(gobj) \
container_of(gobj, struct media_link, graph_obj)
#define gobj_to_link(gobj) \
container_of(gobj, struct media_link, graph_obj)
#define gobj_to_pad(gobj) \
container_of(gobj, struct media_pad, graph_obj)
#define gobj_to_intf(gobj) \
container_of(gobj, struct media_interface, graph_obj)
#define intf_to_devnode(intf) \
container_of(intf, struct media_intf_devnode, intf)
void media_gobj_init(struct media_device *mdev,
enum media_gobj_type type,
struct media_gobj *gobj);
void media_gobj_remove(struct media_gobj *gobj);
int media_entity_pads_init(struct media_entity *entity, u16 num_pads,
struct media_pad *pads);
void media_entity_cleanup(struct media_entity *entity);
__must_check int media_create_pad_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);
struct media_intf_devnode *
__must_check media_devnode_create(struct media_device *mdev,
u32 type, u32 flags,
u32 major, u32 minor);
void media_devnode_remove(struct media_intf_devnode *devnode);
struct media_link *
__must_check media_create_intf_link(struct media_entity *entity,
struct media_interface *intf,
u32 flags);
void __media_remove_intf_link(struct media_link *link);
void media_remove_intf_link(struct media_link *link);
void __media_remove_intf_links(struct media_interface *intf);
void media_remove_intf_links(struct media_interface *intf);
#define media_entity_call(entity, operation, args...) \
(((entity)->ops && (entity)->ops->operation) ? \
(entity)->ops->operation((entity) , ##args) : -ENOIOCTLCMD)
#endif
