linux_dsm_epyc7002/include/media/media-device.h

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/*
* Media device
*
* 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_DEVICE_H
#define _MEDIA_DEVICE_H
#include <linux/list.h>
#include <linux/mutex.h>
[media] media: Entities, pads and links As video hardware pipelines become increasingly complex and configurable, the current hardware description through v4l2 subdevices reaches its limits. In addition to enumerating and configuring subdevices, video camera drivers need a way to discover and modify at runtime how those subdevices are connected. This is done through new elements called entities, pads and links. An entity is a basic media hardware building block. It can correspond to a large variety of logical blocks such as physical hardware devices (CMOS sensor for instance), logical hardware devices (a building block in a System-on-Chip image processing pipeline), DMA channels or physical connectors. A pad is a connection endpoint through which an entity can interact with other entities. Data (not restricted to video) produced by an entity flows from the entity's output to one or more entity inputs. Pads should not be confused with physical pins at chip boundaries. A link is a point-to-point oriented connection between two pads, either on the same entity or on different entities. Data flows from a source pad to a sink pad. Links are stored in the source entity. To make backwards graph walk faster, a copy of all links is also stored in the sink entity. The copy is known as a backlink and is only used to help graph traversal. The entity API is made of three functions: - media_entity_init() initializes an entity. The caller must provide an array of pads as well as an estimated number of links. The links array is allocated dynamically and will be reallocated if it grows beyond the initial estimate. - media_entity_cleanup() frees resources allocated for an entity. It must be called during the cleanup phase after unregistering the entity and before freeing it. - media_entity_create_link() creates a link between two entities. An entry in the link array of each entity is allocated and stores pointers to source and sink pads. When a media device is unregistered, all its entities are unregistered automatically. The code is based on Hans Verkuil <hverkuil@xs4all.nl> initial work. 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>
2009-12-09 18:40:00 +07:00
#include <linux/spinlock.h>
#include <media/media-devnode.h>
[media] media: Entities, pads and links As video hardware pipelines become increasingly complex and configurable, the current hardware description through v4l2 subdevices reaches its limits. In addition to enumerating and configuring subdevices, video camera drivers need a way to discover and modify at runtime how those subdevices are connected. This is done through new elements called entities, pads and links. An entity is a basic media hardware building block. It can correspond to a large variety of logical blocks such as physical hardware devices (CMOS sensor for instance), logical hardware devices (a building block in a System-on-Chip image processing pipeline), DMA channels or physical connectors. A pad is a connection endpoint through which an entity can interact with other entities. Data (not restricted to video) produced by an entity flows from the entity's output to one or more entity inputs. Pads should not be confused with physical pins at chip boundaries. A link is a point-to-point oriented connection between two pads, either on the same entity or on different entities. Data flows from a source pad to a sink pad. Links are stored in the source entity. To make backwards graph walk faster, a copy of all links is also stored in the sink entity. The copy is known as a backlink and is only used to help graph traversal. The entity API is made of three functions: - media_entity_init() initializes an entity. The caller must provide an array of pads as well as an estimated number of links. The links array is allocated dynamically and will be reallocated if it grows beyond the initial estimate. - media_entity_cleanup() frees resources allocated for an entity. It must be called during the cleanup phase after unregistering the entity and before freeing it. - media_entity_create_link() creates a link between two entities. An entry in the link array of each entity is allocated and stores pointers to source and sink pads. When a media device is unregistered, all its entities are unregistered automatically. The code is based on Hans Verkuil <hverkuil@xs4all.nl> initial work. 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>
2009-12-09 18:40:00 +07:00
#include <media/media-entity.h>
/**
* DOC: Media Controller
*
* The media controller userspace API is documented in DocBook format in
* Documentation/DocBook/media/v4l/media-controller.xml. This document focus
* on the kernel-side implementation of the media framework.
*
* * Abstract media device model:
*
* Discovering a device internal topology, and configuring it at runtime, is one
* of the goals of the media framework. To achieve this, hardware devices are
* modelled as an oriented graph of building blocks called entities connected
* through pads.
*
* An entity is a basic media hardware building block. It can correspond to
* a large variety of logical blocks such as physical hardware devices
* (CMOS sensor for instance), logical hardware devices (a building block
* in a System-on-Chip image processing pipeline), DMA channels or physical
* connectors.
*
* A pad is a connection endpoint through which an entity can interact with
* other entities. Data (not restricted to video) produced by an entity
* flows from the entity's output to one or more entity inputs. Pads should
* not be confused with physical pins at chip boundaries.
*
* A link is a point-to-point oriented connection between two pads, either
* on the same entity or on different entities. Data flows from a source
* pad to a sink pad.
*
*
* * Media device:
*
* A media device is represented by a struct &media_device instance, defined in
* include/media/media-device.h. Allocation of the structure is handled by the
* media device driver, usually by embedding the &media_device instance in a
* larger driver-specific structure.
*
* Drivers register media device instances by calling
* __media_device_register() via the macro media_device_register()
* and unregistered by calling
* media_device_unregister().
*
* * Entities, pads and links:
*
* - Entities
*
* Entities are represented by a struct &media_entity instance, defined in
* include/media/media-entity.h. The structure is usually embedded into a
* higher-level structure, such as a v4l2_subdev or video_device instance,
* although drivers can allocate entities directly.
*
* Drivers initialize entity pads by calling
* media_entity_pads_init().
*
* Drivers register entities with a media device by calling
* media_device_register_entity()
* and unregistred by calling
* media_device_unregister_entity().
*
* - Interfaces
*
* Interfaces are represented by a struct &media_interface instance, defined in
* include/media/media-entity.h. Currently, only one type of interface is
* defined: a device node. Such interfaces are represented by a struct
* &media_intf_devnode.
*
* Drivers initialize and create device node interfaces by calling
* media_devnode_create()
* and remove them by calling:
* media_devnode_remove().
*
* - Pads
*
* Pads are represented by a struct &media_pad instance, defined in
* include/media/media-entity.h. Each entity stores its pads in a pads array
* managed by the entity driver. Drivers usually embed the array in a
* driver-specific structure.
*
* Pads are identified by their entity and their 0-based index in the pads
* array.
* Both information are stored in the &media_pad structure, making the
* &media_pad pointer the canonical way to store and pass link references.
*
* Pads have flags that describe the pad capabilities and state.
*
* %MEDIA_PAD_FL_SINK indicates that the pad supports sinking data.
* %MEDIA_PAD_FL_SOURCE indicates that the pad supports sourcing data.
*
* NOTE: One and only one of %MEDIA_PAD_FL_SINK and %MEDIA_PAD_FL_SOURCE must
* be set for each pad.
*
* - Links
*
* Links are represented by a struct &media_link instance, defined in
* include/media/media-entity.h. There are two types of links:
*
* 1. pad to pad links:
*
* Associate two entities via their PADs. Each entity has a list that points
* to all links originating at or targeting any of its pads.
* A given link is thus stored twice, once in the source entity and once in
* the target entity.
*
* Drivers create pad to pad links by calling:
* media_create_pad_link() and remove with media_entity_remove_links().
*
* 2. interface to entity links:
*
* Associate one interface to a Link.
*
* Drivers create interface to entity links by calling:
* media_create_intf_link() and remove with media_remove_intf_links().
*
* NOTE:
*
* Links can only be created after having both ends already created.
*
* Links have flags that describe the link capabilities and state. The
* valid values are described at media_create_pad_link() and
* media_create_intf_link().
*
* Graph traversal:
*
* The media framework provides APIs to iterate over entities in a graph.
*
* To iterate over all entities belonging to a media device, drivers can use
* the media_device_for_each_entity macro, defined in
* include/media/media-device.h.
*
* struct media_entity *entity;
*
* media_device_for_each_entity(entity, mdev) {
* // entity will point to each entity in turn
* ...
* }
*
* Drivers might also need to iterate over all entities in a graph that can be
* reached only through enabled links starting at a given entity. The media
* framework provides a depth-first graph traversal API for that purpose.
*
* Note that graphs with cycles (whether directed or undirected) are *NOT*
* supported by the graph traversal API. To prevent infinite loops, the graph
* traversal code limits the maximum depth to MEDIA_ENTITY_ENUM_MAX_DEPTH,
* currently defined as 16.
*
* Drivers initiate a graph traversal by calling
* media_entity_graph_walk_start()
*
* The graph structure, provided by the caller, is initialized to start graph
* traversal at the given entity.
*
* Drivers can then retrieve the next entity by calling
* media_entity_graph_walk_next()
*
* When the graph traversal is complete the function will return NULL.
*
* Graph traversal can be interrupted at any moment. No cleanup function call
* is required and the graph structure can be freed normally.
*
* Helper functions can be used to find a link between two given pads, or a pad
* connected to another pad through an enabled link
* media_entity_find_link() and media_entity_remote_pad()
*
* Use count and power handling:
*
* 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 &media_entity.@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.
*
* Links setup:
*
* Link properties can be modified at runtime by calling
* media_entity_setup_link()
*
* Pipelines and media streams:
*
* When starting streaming, drivers must notify all entities in the pipeline to
* prevent link states from being modified during streaming by calling
* media_entity_pipeline_start().
*
* The function will mark all entities connected to the given entity through
* enabled links, either directly or indirectly, as streaming.
*
* The &media_pipeline instance pointed to by the pipe argument will be stored
* in every entity in the pipeline. Drivers should embed the &media_pipeline
* structure in higher-level pipeline structures and can then access the
* pipeline through the &media_entity pipe field.
*
* Calls to media_entity_pipeline_start() can be nested. The pipeline pointer
* must be identical for all nested calls to the function.
*
* media_entity_pipeline_start() may return an error. In that case, it will
* clean up any of the changes it did by itself.
*
* When stopping the stream, drivers must notify the entities with
* media_entity_pipeline_stop().
*
* If multiple calls to media_entity_pipeline_start() have been made the same
* number of media_entity_pipeline_stop() calls are required to stop streaming.
* The &media_entity pipe field is reset to NULL on the last nested stop call.
*
* Link configuration will fail with -%EBUSY by default if either end of the
* link is a streaming entity. Links that can be modified while streaming must
* be marked with the %MEDIA_LNK_FL_DYNAMIC flag.
*
* If other operations need to be disallowed on streaming entities (such as
* changing entities configuration parameters) drivers can explicitly check the
* media_entity stream_count field to find out if an entity is streaming. This
* operation must be done with the media_device graph_mutex held.
*
* Link validation:
*
* Link validation is performed by media_entity_pipeline_start() for any
* entity which has sink pads in the pipeline. The
* &media_entity.@link_validate() callback is used for that purpose. In
* @link_validate() callback, entity driver should check that the properties of
* the source pad of the connected entity and its own sink pad match. It is up
* to the type of the entity (and in the end, the properties of the hardware)
* what matching actually means.
*
* Subsystems should facilitate link validation by providing subsystem specific
* helper functions to provide easy access for commonly needed information, and
* in the end provide a way to use driver-specific callbacks.
*/
struct ida;
struct device;
/**
* struct media_device - Media device
* @dev: Parent device
* @devnode: Media device node
* @model: Device model name
* @serial: Device serial number (optional)
* @bus_info: Unique and stable device location identifier
* @hw_revision: Hardware device revision
* @driver_version: Device driver version
* @topology_version: Monotonic counter for storing the version of the graph
* topology. Should be incremented each time the topology changes.
* @entity_id: Unique ID used on the last entity registered
* @pad_id: Unique ID used on the last pad registered
* @link_id: Unique ID used on the last link registered
* @intf_devnode_id: Unique ID used on the last interface devnode registered
* @entity_internal_idx: Allocated internal entity indices
[media] media: Entities, pads and links As video hardware pipelines become increasingly complex and configurable, the current hardware description through v4l2 subdevices reaches its limits. In addition to enumerating and configuring subdevices, video camera drivers need a way to discover and modify at runtime how those subdevices are connected. This is done through new elements called entities, pads and links. An entity is a basic media hardware building block. It can correspond to a large variety of logical blocks such as physical hardware devices (CMOS sensor for instance), logical hardware devices (a building block in a System-on-Chip image processing pipeline), DMA channels or physical connectors. A pad is a connection endpoint through which an entity can interact with other entities. Data (not restricted to video) produced by an entity flows from the entity's output to one or more entity inputs. Pads should not be confused with physical pins at chip boundaries. A link is a point-to-point oriented connection between two pads, either on the same entity or on different entities. Data flows from a source pad to a sink pad. Links are stored in the source entity. To make backwards graph walk faster, a copy of all links is also stored in the sink entity. The copy is known as a backlink and is only used to help graph traversal. The entity API is made of three functions: - media_entity_init() initializes an entity. The caller must provide an array of pads as well as an estimated number of links. The links array is allocated dynamically and will be reallocated if it grows beyond the initial estimate. - media_entity_cleanup() frees resources allocated for an entity. It must be called during the cleanup phase after unregistering the entity and before freeing it. - media_entity_create_link() creates a link between two entities. An entry in the link array of each entity is allocated and stores pointers to source and sink pads. When a media device is unregistered, all its entities are unregistered automatically. The code is based on Hans Verkuil <hverkuil@xs4all.nl> initial work. 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>
2009-12-09 18:40:00 +07:00
* @entities: List of registered entities
* @interfaces: List of registered interfaces
* @pads: List of registered pads
* @links: List of registered links
[media] media: Entities, pads and links As video hardware pipelines become increasingly complex and configurable, the current hardware description through v4l2 subdevices reaches its limits. In addition to enumerating and configuring subdevices, video camera drivers need a way to discover and modify at runtime how those subdevices are connected. This is done through new elements called entities, pads and links. An entity is a basic media hardware building block. It can correspond to a large variety of logical blocks such as physical hardware devices (CMOS sensor for instance), logical hardware devices (a building block in a System-on-Chip image processing pipeline), DMA channels or physical connectors. A pad is a connection endpoint through which an entity can interact with other entities. Data (not restricted to video) produced by an entity flows from the entity's output to one or more entity inputs. Pads should not be confused with physical pins at chip boundaries. A link is a point-to-point oriented connection between two pads, either on the same entity or on different entities. Data flows from a source pad to a sink pad. Links are stored in the source entity. To make backwards graph walk faster, a copy of all links is also stored in the sink entity. The copy is known as a backlink and is only used to help graph traversal. The entity API is made of three functions: - media_entity_init() initializes an entity. The caller must provide an array of pads as well as an estimated number of links. The links array is allocated dynamically and will be reallocated if it grows beyond the initial estimate. - media_entity_cleanup() frees resources allocated for an entity. It must be called during the cleanup phase after unregistering the entity and before freeing it. - media_entity_create_link() creates a link between two entities. An entry in the link array of each entity is allocated and stores pointers to source and sink pads. When a media device is unregistered, all its entities are unregistered automatically. The code is based on Hans Verkuil <hverkuil@xs4all.nl> initial work. 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>
2009-12-09 18:40:00 +07:00
* @lock: Entities list lock
* @graph_mutex: Entities graph operation lock
* @link_notify: Link state change notification callback
*
* This structure represents an abstract high-level media device. It allows easy
* access to entities and provides basic media device-level support. The
* structure can be allocated directly or embedded in a larger structure.
*
* The parent @dev is a physical device. It must be set before registering the
* media device.
*
* @model is a descriptive model name exported through sysfs. It doesn't have to
* be unique.
*/
struct media_device {
/* dev->driver_data points to this struct. */
struct device *dev;
struct media_devnode devnode;
char model[32];
char serial[40];
char bus_info[32];
u32 hw_revision;
u32 driver_version;
[media] media: Entities, pads and links As video hardware pipelines become increasingly complex and configurable, the current hardware description through v4l2 subdevices reaches its limits. In addition to enumerating and configuring subdevices, video camera drivers need a way to discover and modify at runtime how those subdevices are connected. This is done through new elements called entities, pads and links. An entity is a basic media hardware building block. It can correspond to a large variety of logical blocks such as physical hardware devices (CMOS sensor for instance), logical hardware devices (a building block in a System-on-Chip image processing pipeline), DMA channels or physical connectors. A pad is a connection endpoint through which an entity can interact with other entities. Data (not restricted to video) produced by an entity flows from the entity's output to one or more entity inputs. Pads should not be confused with physical pins at chip boundaries. A link is a point-to-point oriented connection between two pads, either on the same entity or on different entities. Data flows from a source pad to a sink pad. Links are stored in the source entity. To make backwards graph walk faster, a copy of all links is also stored in the sink entity. The copy is known as a backlink and is only used to help graph traversal. The entity API is made of three functions: - media_entity_init() initializes an entity. The caller must provide an array of pads as well as an estimated number of links. The links array is allocated dynamically and will be reallocated if it grows beyond the initial estimate. - media_entity_cleanup() frees resources allocated for an entity. It must be called during the cleanup phase after unregistering the entity and before freeing it. - media_entity_create_link() creates a link between two entities. An entry in the link array of each entity is allocated and stores pointers to source and sink pads. When a media device is unregistered, all its entities are unregistered automatically. The code is based on Hans Verkuil <hverkuil@xs4all.nl> initial work. 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>
2009-12-09 18:40:00 +07:00
u32 topology_version;
[media] media: Entities, pads and links As video hardware pipelines become increasingly complex and configurable, the current hardware description through v4l2 subdevices reaches its limits. In addition to enumerating and configuring subdevices, video camera drivers need a way to discover and modify at runtime how those subdevices are connected. This is done through new elements called entities, pads and links. An entity is a basic media hardware building block. It can correspond to a large variety of logical blocks such as physical hardware devices (CMOS sensor for instance), logical hardware devices (a building block in a System-on-Chip image processing pipeline), DMA channels or physical connectors. A pad is a connection endpoint through which an entity can interact with other entities. Data (not restricted to video) produced by an entity flows from the entity's output to one or more entity inputs. Pads should not be confused with physical pins at chip boundaries. A link is a point-to-point oriented connection between two pads, either on the same entity or on different entities. Data flows from a source pad to a sink pad. Links are stored in the source entity. To make backwards graph walk faster, a copy of all links is also stored in the sink entity. The copy is known as a backlink and is only used to help graph traversal. The entity API is made of three functions: - media_entity_init() initializes an entity. The caller must provide an array of pads as well as an estimated number of links. The links array is allocated dynamically and will be reallocated if it grows beyond the initial estimate. - media_entity_cleanup() frees resources allocated for an entity. It must be called during the cleanup phase after unregistering the entity and before freeing it. - media_entity_create_link() creates a link between two entities. An entry in the link array of each entity is allocated and stores pointers to source and sink pads. When a media device is unregistered, all its entities are unregistered automatically. The code is based on Hans Verkuil <hverkuil@xs4all.nl> initial work. 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>
2009-12-09 18:40:00 +07:00
u32 entity_id;
u32 pad_id;
u32 link_id;
u32 intf_devnode_id;
struct ida entity_internal_idx;
int entity_internal_idx_max;
[media] media: Entities, pads and links As video hardware pipelines become increasingly complex and configurable, the current hardware description through v4l2 subdevices reaches its limits. In addition to enumerating and configuring subdevices, video camera drivers need a way to discover and modify at runtime how those subdevices are connected. This is done through new elements called entities, pads and links. An entity is a basic media hardware building block. It can correspond to a large variety of logical blocks such as physical hardware devices (CMOS sensor for instance), logical hardware devices (a building block in a System-on-Chip image processing pipeline), DMA channels or physical connectors. A pad is a connection endpoint through which an entity can interact with other entities. Data (not restricted to video) produced by an entity flows from the entity's output to one or more entity inputs. Pads should not be confused with physical pins at chip boundaries. A link is a point-to-point oriented connection between two pads, either on the same entity or on different entities. Data flows from a source pad to a sink pad. Links are stored in the source entity. To make backwards graph walk faster, a copy of all links is also stored in the sink entity. The copy is known as a backlink and is only used to help graph traversal. The entity API is made of three functions: - media_entity_init() initializes an entity. The caller must provide an array of pads as well as an estimated number of links. The links array is allocated dynamically and will be reallocated if it grows beyond the initial estimate. - media_entity_cleanup() frees resources allocated for an entity. It must be called during the cleanup phase after unregistering the entity and before freeing it. - media_entity_create_link() creates a link between two entities. An entry in the link array of each entity is allocated and stores pointers to source and sink pads. When a media device is unregistered, all its entities are unregistered automatically. The code is based on Hans Verkuil <hverkuil@xs4all.nl> initial work. 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>
2009-12-09 18:40:00 +07:00
struct list_head entities;
struct list_head interfaces;
struct list_head pads;
struct list_head links;
[media] media: Entities, pads and links As video hardware pipelines become increasingly complex and configurable, the current hardware description through v4l2 subdevices reaches its limits. In addition to enumerating and configuring subdevices, video camera drivers need a way to discover and modify at runtime how those subdevices are connected. This is done through new elements called entities, pads and links. An entity is a basic media hardware building block. It can correspond to a large variety of logical blocks such as physical hardware devices (CMOS sensor for instance), logical hardware devices (a building block in a System-on-Chip image processing pipeline), DMA channels or physical connectors. A pad is a connection endpoint through which an entity can interact with other entities. Data (not restricted to video) produced by an entity flows from the entity's output to one or more entity inputs. Pads should not be confused with physical pins at chip boundaries. A link is a point-to-point oriented connection between two pads, either on the same entity or on different entities. Data flows from a source pad to a sink pad. Links are stored in the source entity. To make backwards graph walk faster, a copy of all links is also stored in the sink entity. The copy is known as a backlink and is only used to help graph traversal. The entity API is made of three functions: - media_entity_init() initializes an entity. The caller must provide an array of pads as well as an estimated number of links. The links array is allocated dynamically and will be reallocated if it grows beyond the initial estimate. - media_entity_cleanup() frees resources allocated for an entity. It must be called during the cleanup phase after unregistering the entity and before freeing it. - media_entity_create_link() creates a link between two entities. An entry in the link array of each entity is allocated and stores pointers to source and sink pads. When a media device is unregistered, all its entities are unregistered automatically. The code is based on Hans Verkuil <hverkuil@xs4all.nl> initial work. 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>
2009-12-09 18:40:00 +07:00
/* Protects the graph objects creation/removal */
[media] media: Entities, pads and links As video hardware pipelines become increasingly complex and configurable, the current hardware description through v4l2 subdevices reaches its limits. In addition to enumerating and configuring subdevices, video camera drivers need a way to discover and modify at runtime how those subdevices are connected. This is done through new elements called entities, pads and links. An entity is a basic media hardware building block. It can correspond to a large variety of logical blocks such as physical hardware devices (CMOS sensor for instance), logical hardware devices (a building block in a System-on-Chip image processing pipeline), DMA channels or physical connectors. A pad is a connection endpoint through which an entity can interact with other entities. Data (not restricted to video) produced by an entity flows from the entity's output to one or more entity inputs. Pads should not be confused with physical pins at chip boundaries. A link is a point-to-point oriented connection between two pads, either on the same entity or on different entities. Data flows from a source pad to a sink pad. Links are stored in the source entity. To make backwards graph walk faster, a copy of all links is also stored in the sink entity. The copy is known as a backlink and is only used to help graph traversal. The entity API is made of three functions: - media_entity_init() initializes an entity. The caller must provide an array of pads as well as an estimated number of links. The links array is allocated dynamically and will be reallocated if it grows beyond the initial estimate. - media_entity_cleanup() frees resources allocated for an entity. It must be called during the cleanup phase after unregistering the entity and before freeing it. - media_entity_create_link() creates a link between two entities. An entry in the link array of each entity is allocated and stores pointers to source and sink pads. When a media device is unregistered, all its entities are unregistered automatically. The code is based on Hans Verkuil <hverkuil@xs4all.nl> initial work. 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>
2009-12-09 18:40:00 +07:00
spinlock_t lock;
/* Serializes graph operations. */
struct mutex graph_mutex;
int (*link_notify)(struct media_link *link, u32 flags,
unsigned int notification);
};
#ifdef CONFIG_MEDIA_CONTROLLER
/* Supported link_notify @notification values. */
#define MEDIA_DEV_NOTIFY_PRE_LINK_CH 0
#define MEDIA_DEV_NOTIFY_POST_LINK_CH 1
/* media_devnode to media_device */
#define to_media_device(node) container_of(node, struct media_device, devnode)
/**
* media_entity_enum_init - Initialise an entity enumeration
*
* @e: Entity enumeration to be initialised
* @mdev: The related media device
*
* Returns zero on success or a negative error code.
*/
static inline __must_check int media_entity_enum_init(
struct media_entity_enum *ent_enum, struct media_device *mdev)
{
return __media_entity_enum_init(ent_enum,
mdev->entity_internal_idx_max + 1);
}
/**
* media_device_init() - Initializes a media device element
*
* @mdev: pointer to struct &media_device
*
* This function initializes the media device prior to its registration.
* The media device initialization and registration is split in two functions
* to avoid race conditions and make the media device available to user-space
* before the media graph has been completed.
*
* So drivers need to first initialize the media device, register any entity
* within the media device, create pad to pad links and then finally register
* the media device by calling media_device_register() as a final step.
*/
void media_device_init(struct media_device *mdev);
/**
* media_device_cleanup() - Cleanups a media device element
*
* @mdev: pointer to struct &media_device
*
* This function that will destroy the graph_mutex that is
* initialized in media_device_init().
*/
void media_device_cleanup(struct media_device *mdev);
/**
* __media_device_register() - Registers a media device element
*
* @mdev: pointer to struct &media_device
* @owner: should be filled with %THIS_MODULE
*
* Users, should, instead, call the media_device_register() macro.
*
* The caller is responsible for initializing the media_device structure before
* registration. The following fields must be set:
*
* - dev must point to the parent device (usually a &pci_dev, &usb_interface or
* &platform_device instance).
*
* - model must be filled with the device model name as a NUL-terminated UTF-8
* string. The device/model revision must not be stored in this field.
*
* The following fields are optional:
*
* - serial is a unique serial number stored as a NUL-terminated ASCII string.
* The field is big enough to store a GUID in text form. If the hardware
* doesn't provide a unique serial number this field must be left empty.
*
* - bus_info represents the location of the device in the system as a
* NUL-terminated ASCII string. For PCI/PCIe devices bus_info must be set to
* "PCI:" (or "PCIe:") followed by the value of pci_name(). For USB devices,
* the usb_make_path() function must be used. This field is used by
* applications to distinguish between otherwise identical devices that don't
* provide a serial number.
*
* - hw_revision is the hardware device revision in a driver-specific format.
* When possible the revision should be formatted with the KERNEL_VERSION
* macro.
*
* - driver_version is formatted with the KERNEL_VERSION macro. The version
* minor must be incremented when new features are added to the userspace API
* without breaking binary compatibility. The version major must be
* incremented when binary compatibility is broken.
*
* Notes:
*
* Upon successful registration a character device named media[0-9]+ is created.
* The device major and minor numbers are dynamic. The model name is exported as
* a sysfs attribute.
*
* Unregistering a media device that hasn't been registered is *NOT* safe.
*/
int __must_check __media_device_register(struct media_device *mdev,
struct module *owner);
#define media_device_register(mdev) __media_device_register(mdev, THIS_MODULE)
/**
* __media_device_unregister() - Unegisters a media device element
*
* @mdev: pointer to struct &media_device
*/
void media_device_unregister(struct media_device *mdev);
/**
* media_device_register_entity() - registers a media entity inside a
* previously registered media device.
*
* @mdev: pointer to struct &media_device
* @entity: pointer to struct &media_entity to be registered
*
* Entities are identified by a unique positive integer ID. The media
* controller framework will such ID automatically. IDs are not guaranteed
* to be contiguous, and the ID number can change on newer Kernel versions.
* So, neither the driver nor userspace should hardcode ID numbers to refer
* to the entities, but, instead, use the framework to find the ID, when
* needed.
*
* The media_entity name, type and flags fields should be initialized before
* calling media_device_register_entity(). Entities embedded in higher-level
* standard structures can have some of those fields set by the higher-level
* framework.
*
* If the device has pads, media_entity_pads_init() should be called before
* this function. Otherwise, the &media_entity.@pad and &media_entity.@num_pads
* should be zeroed before calling this function.
*
* Entities have flags that describe the entity capabilities and state:
*
* %MEDIA_ENT_FL_DEFAULT indicates the default entity for a given type.
* This can be used to report the default audio and video devices or the
* default camera sensor.
*
* NOTE: Drivers should set the entity function before calling this function.
* Please notice that the values %MEDIA_ENT_F_V4L2_SUBDEV_UNKNOWN and
* %MEDIA_ENT_F_UNKNOWN should not be used by the drivers.
*/
[media] media: Entities, pads and links As video hardware pipelines become increasingly complex and configurable, the current hardware description through v4l2 subdevices reaches its limits. In addition to enumerating and configuring subdevices, video camera drivers need a way to discover and modify at runtime how those subdevices are connected. This is done through new elements called entities, pads and links. An entity is a basic media hardware building block. It can correspond to a large variety of logical blocks such as physical hardware devices (CMOS sensor for instance), logical hardware devices (a building block in a System-on-Chip image processing pipeline), DMA channels or physical connectors. A pad is a connection endpoint through which an entity can interact with other entities. Data (not restricted to video) produced by an entity flows from the entity's output to one or more entity inputs. Pads should not be confused with physical pins at chip boundaries. A link is a point-to-point oriented connection between two pads, either on the same entity or on different entities. Data flows from a source pad to a sink pad. Links are stored in the source entity. To make backwards graph walk faster, a copy of all links is also stored in the sink entity. The copy is known as a backlink and is only used to help graph traversal. The entity API is made of three functions: - media_entity_init() initializes an entity. The caller must provide an array of pads as well as an estimated number of links. The links array is allocated dynamically and will be reallocated if it grows beyond the initial estimate. - media_entity_cleanup() frees resources allocated for an entity. It must be called during the cleanup phase after unregistering the entity and before freeing it. - media_entity_create_link() creates a link between two entities. An entry in the link array of each entity is allocated and stores pointers to source and sink pads. When a media device is unregistered, all its entities are unregistered automatically. The code is based on Hans Verkuil <hverkuil@xs4all.nl> initial work. 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>
2009-12-09 18:40:00 +07:00
int __must_check media_device_register_entity(struct media_device *mdev,
struct media_entity *entity);
/*
* media_device_unregister_entity() - unregisters a media entity.
*
* @entity: pointer to struct &media_entity to be unregistered
*
* All links associated with the entity and all PADs are automatically
* unregistered from the media_device when this function is called.
*
* Unregistering an entity will not change the IDs of the other entities and
* the previoully used ID will never be reused for a newly registered entities.
*
* When a media device is unregistered, all its entities are unregistered
* automatically. No manual entities unregistration is then required.
*
* Note: the media_entity instance itself must be freed explicitly by
* the driver if required.
*/
[media] media: Entities, pads and links As video hardware pipelines become increasingly complex and configurable, the current hardware description through v4l2 subdevices reaches its limits. In addition to enumerating and configuring subdevices, video camera drivers need a way to discover and modify at runtime how those subdevices are connected. This is done through new elements called entities, pads and links. An entity is a basic media hardware building block. It can correspond to a large variety of logical blocks such as physical hardware devices (CMOS sensor for instance), logical hardware devices (a building block in a System-on-Chip image processing pipeline), DMA channels or physical connectors. A pad is a connection endpoint through which an entity can interact with other entities. Data (not restricted to video) produced by an entity flows from the entity's output to one or more entity inputs. Pads should not be confused with physical pins at chip boundaries. A link is a point-to-point oriented connection between two pads, either on the same entity or on different entities. Data flows from a source pad to a sink pad. Links are stored in the source entity. To make backwards graph walk faster, a copy of all links is also stored in the sink entity. The copy is known as a backlink and is only used to help graph traversal. The entity API is made of three functions: - media_entity_init() initializes an entity. The caller must provide an array of pads as well as an estimated number of links. The links array is allocated dynamically and will be reallocated if it grows beyond the initial estimate. - media_entity_cleanup() frees resources allocated for an entity. It must be called during the cleanup phase after unregistering the entity and before freeing it. - media_entity_create_link() creates a link between two entities. An entry in the link array of each entity is allocated and stores pointers to source and sink pads. When a media device is unregistered, all its entities are unregistered automatically. The code is based on Hans Verkuil <hverkuil@xs4all.nl> initial work. 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>
2009-12-09 18:40:00 +07:00
void media_device_unregister_entity(struct media_entity *entity);
/**
* media_device_get_devres() - get media device as device resource
* creates if one doesn't exist
*
* @dev: pointer to struct &device.
*
* Sometimes, the media controller &media_device needs to be shared by more
* than one driver. This function adds support for that, by dynamically
* allocating the &media_device and allowing it to be obtained from the
* struct &device associated with the common device where all sub-device
* components belong. So, for example, on an USB device with multiple
* interfaces, each interface may be handled by a separate per-interface
* drivers. While each interface have its own &device, they all share a
* common &device associated with the hole USB device.
*/
struct media_device *media_device_get_devres(struct device *dev);
/**
* media_device_find_devres() - find media device as device resource
*
* @dev: pointer to struct &device.
*/
struct media_device *media_device_find_devres(struct device *dev);
[media] media: Entities, pads and links As video hardware pipelines become increasingly complex and configurable, the current hardware description through v4l2 subdevices reaches its limits. In addition to enumerating and configuring subdevices, video camera drivers need a way to discover and modify at runtime how those subdevices are connected. This is done through new elements called entities, pads and links. An entity is a basic media hardware building block. It can correspond to a large variety of logical blocks such as physical hardware devices (CMOS sensor for instance), logical hardware devices (a building block in a System-on-Chip image processing pipeline), DMA channels or physical connectors. A pad is a connection endpoint through which an entity can interact with other entities. Data (not restricted to video) produced by an entity flows from the entity's output to one or more entity inputs. Pads should not be confused with physical pins at chip boundaries. A link is a point-to-point oriented connection between two pads, either on the same entity or on different entities. Data flows from a source pad to a sink pad. Links are stored in the source entity. To make backwards graph walk faster, a copy of all links is also stored in the sink entity. The copy is known as a backlink and is only used to help graph traversal. The entity API is made of three functions: - media_entity_init() initializes an entity. The caller must provide an array of pads as well as an estimated number of links. The links array is allocated dynamically and will be reallocated if it grows beyond the initial estimate. - media_entity_cleanup() frees resources allocated for an entity. It must be called during the cleanup phase after unregistering the entity and before freeing it. - media_entity_create_link() creates a link between two entities. An entry in the link array of each entity is allocated and stores pointers to source and sink pads. When a media device is unregistered, all its entities are unregistered automatically. The code is based on Hans Verkuil <hverkuil@xs4all.nl> initial work. 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>
2009-12-09 18:40:00 +07:00
/* Iterate over all entities. */
#define media_device_for_each_entity(entity, mdev) \
list_for_each_entry(entity, &(mdev)->entities, graph_obj.list)
[media] media: Entities, pads and links As video hardware pipelines become increasingly complex and configurable, the current hardware description through v4l2 subdevices reaches its limits. In addition to enumerating and configuring subdevices, video camera drivers need a way to discover and modify at runtime how those subdevices are connected. This is done through new elements called entities, pads and links. An entity is a basic media hardware building block. It can correspond to a large variety of logical blocks such as physical hardware devices (CMOS sensor for instance), logical hardware devices (a building block in a System-on-Chip image processing pipeline), DMA channels or physical connectors. A pad is a connection endpoint through which an entity can interact with other entities. Data (not restricted to video) produced by an entity flows from the entity's output to one or more entity inputs. Pads should not be confused with physical pins at chip boundaries. A link is a point-to-point oriented connection between two pads, either on the same entity or on different entities. Data flows from a source pad to a sink pad. Links are stored in the source entity. To make backwards graph walk faster, a copy of all links is also stored in the sink entity. The copy is known as a backlink and is only used to help graph traversal. The entity API is made of three functions: - media_entity_init() initializes an entity. The caller must provide an array of pads as well as an estimated number of links. The links array is allocated dynamically and will be reallocated if it grows beyond the initial estimate. - media_entity_cleanup() frees resources allocated for an entity. It must be called during the cleanup phase after unregistering the entity and before freeing it. - media_entity_create_link() creates a link between two entities. An entry in the link array of each entity is allocated and stores pointers to source and sink pads. When a media device is unregistered, all its entities are unregistered automatically. The code is based on Hans Verkuil <hverkuil@xs4all.nl> initial work. 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>
2009-12-09 18:40:00 +07:00
/* Iterate over all interfaces. */
#define media_device_for_each_intf(intf, mdev) \
list_for_each_entry(intf, &(mdev)->interfaces, graph_obj.list)
/* Iterate over all pads. */
#define media_device_for_each_pad(pad, mdev) \
list_for_each_entry(pad, &(mdev)->pads, graph_obj.list)
/* Iterate over all links. */
#define media_device_for_each_link(link, mdev) \
list_for_each_entry(link, &(mdev)->links, graph_obj.list)
#else
static inline int media_device_register(struct media_device *mdev)
{
return 0;
}
static inline void media_device_unregister(struct media_device *mdev)
{
}
static inline int media_device_register_entity(struct media_device *mdev,
struct media_entity *entity)
{
return 0;
}
static inline void media_device_unregister_entity(struct media_entity *entity)
{
}
static inline struct media_device *media_device_get_devres(struct device *dev)
{
return NULL;
}
static inline struct media_device *media_device_find_devres(struct device *dev)
{
return NULL;
}
#endif /* CONFIG_MEDIA_CONTROLLER */
#endif