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+/* SPDX-License-Identifier: GPL-2.0-only */
+/*
+ * Media entity
+ *
+ * Copyright (C) 2010 Nokia Corporation
+ *
+ * Contacts: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
+ * Sakari Ailus <sakari.ailus@iki.fi>
+ */
+
+#ifndef _MEDIA_ENTITY_H
+#define _MEDIA_ENTITY_H
+
+#include <linux/bitmap.h>
+#include <linux/bug.h>
+#include <linux/container_of.h>
+#include <linux/fwnode.h>
+#include <linux/list.h>
+#include <linux/media.h>
+#include <linux/minmax.h>
+#include <linux/types.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_ID (32 - MEDIA_BITS_PER_TYPE)
+#define MEDIA_ID_MASK GENMASK_ULL(MEDIA_BITS_PER_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_ID to store the 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;
+};
+
+#define MEDIA_ENTITY_ENUM_MAX_DEPTH 16
+
+/**
+ * struct media_entity_enum - An enumeration of media entities.
+ *
+ * @bmap: Bit map in which each bit represents one entity at struct
+ * media_entity->internal_idx.
+ * @idx_max: Number of bits in bmap
+ */
+struct media_entity_enum {
+ unsigned long *bmap;
+ int idx_max;
+};
+
+/**
+ * struct media_graph - Media graph traversal state
+ *
+ * @stack: Graph traversal stack; the stack contains information
+ * on the path the media entities to be walked and the
+ * links through which they were reached.
+ * @stack.entity: pointer to &struct media_entity at the graph.
+ * @stack.link: pointer to &struct list_head.
+ * @ent_enum: Visited entities
+ * @top: The top of the stack
+ */
+struct media_graph {
+ struct {
+ struct media_entity *entity;
+ struct list_head *link;
+ } stack[MEDIA_ENTITY_ENUM_MAX_DEPTH];
+
+ struct media_entity_enum ent_enum;
+ int top;
+};
+
+/**
+ * struct media_pipeline - Media pipeline related information
+ *
+ * @allocated: Media pipeline allocated and freed by the framework
+ * @mdev: The media device the pipeline is part of
+ * @pads: List of media_pipeline_pad
+ * @start_count: Media pipeline start - stop count
+ */
+struct media_pipeline {
+ bool allocated;
+ struct media_device *mdev;
+ struct list_head pads;
+ int start_count;
+};
+
+/**
+ * struct media_pipeline_pad - A pad part of a media pipeline
+ *
+ * @list: Entry in the media_pad pads list
+ * @pipe: The media_pipeline that the pad is part of
+ * @pad: The media pad
+ *
+ * This structure associate a pad with a media pipeline. Instances of
+ * media_pipeline_pad are created by media_pipeline_start() when it builds the
+ * pipeline, and stored in the &media_pad.pads list. media_pipeline_stop()
+ * removes the entries from the list and deletes them.
+ */
+struct media_pipeline_pad {
+ struct list_head list;
+ struct media_pipeline *pipe;
+ struct media_pad *pad;
+};
+
+/**
+ * struct media_pipeline_pad_iter - Iterator for media_pipeline_for_each_pad
+ *
+ * @cursor: The current element
+ */
+struct media_pipeline_pad_iter {
+ struct list_head *cursor;
+};
+
+/**
+ * struct media_pipeline_entity_iter - Iterator for media_pipeline_for_each_entity
+ *
+ * @ent_enum: The entity enumeration tracker
+ * @cursor: The current element
+ */
+struct media_pipeline_entity_iter {
+ struct media_entity_enum ent_enum;
+ struct list_head *cursor;
+};
+
+/**
+ * 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.
+ * @sink: 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;
+};
+
+/**
+ * enum media_pad_signal_type - type of the signal inside a media pad
+ *
+ * @PAD_SIGNAL_DEFAULT:
+ * Default signal. Use this when all inputs or all outputs are
+ * uniquely identified by the pad number.
+ * @PAD_SIGNAL_ANALOG:
+ * The pad contains an analog signal. It can be Radio Frequency,
+ * Intermediate Frequency, a baseband signal or sub-carriers.
+ * Tuner inputs, IF-PLL demodulators, composite and s-video signals
+ * should use it.
+ * @PAD_SIGNAL_DV:
+ * Contains a digital video signal, with can be a bitstream of samples
+ * taken from an analog TV video source. On such case, it usually
+ * contains the VBI data on it.
+ * @PAD_SIGNAL_AUDIO:
+ * Contains an Intermediate Frequency analog signal from an audio
+ * sub-carrier or an audio bitstream. IF signals are provided by tuners
+ * and consumed by audio AM/FM decoders. Bitstream audio is provided by
+ * an audio decoder.
+ */
+enum media_pad_signal_type {
+ PAD_SIGNAL_DEFAULT = 0,
+ PAD_SIGNAL_ANALOG,
+ PAD_SIGNAL_DV,
+ PAD_SIGNAL_AUDIO,
+};
+
+/**
+ * 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
+ * @sig_type: Type of the signal inside a media pad
+ * @flags: Pad flags, as defined in
+ * :ref:`include/uapi/linux/media.h <media_header>`
+ * (seek for ``MEDIA_PAD_FL_*``)
+ * @pipe: Pipeline this pad belongs to. Use media_entity_pipeline() to
+ * access this field.
+ */
+struct media_pad {
+ struct media_gobj graph_obj; /* must be first field in struct */
+ struct media_entity *entity;
+ u16 index;
+ enum media_pad_signal_type sig_type;
+ unsigned long flags;
+
+ /*
+ * The fields below are private, and should only be accessed via
+ * appropriate functions.
+ */
+ struct media_pipeline *pipe;
+};
+
+/**
+ * struct media_entity_operations - Media entity operations
+ * @get_fwnode_pad: Return the pad number based on a fwnode endpoint or
+ * a negative value on error. This operation can be used
+ * to map a fwnode to a media pad number. Optional.
+ * @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_pipeline_start() function
+ * validates all links by calling this operation. Optional.
+ * @has_pad_interdep: Return whether two pads of the entity are
+ * interdependent. If two pads are interdependent they are
+ * part of the same pipeline and enabling one of the pads
+ * means that the other pad will become "locked" and
+ * doesn't allow configuration changes. pad0 and pad1 are
+ * guaranteed to not both be sinks or sources. Never call
+ * the .has_pad_interdep() operation directly, always use
+ * media_entity_has_pad_interdep().
+ * Optional: If the operation isn't implemented all pads
+ * will be considered as interdependent.
+ *
+ * .. note::
+ *
+ * Those these callbacks are called with struct &media_device.graph_mutex
+ * mutex held.
+ */
+struct media_entity_operations {
+ int (*get_fwnode_pad)(struct media_entity *entity,
+ struct fwnode_endpoint *endpoint);
+ 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);
+ bool (*has_pad_interdep)(struct media_entity *entity, unsigned int pad0,
+ unsigned int pad1);
+};
+
+/**
+ * enum media_entity_type - Media entity type
+ *
+ * @MEDIA_ENTITY_TYPE_BASE:
+ * The entity isn't embedded in another subsystem structure.
+ * @MEDIA_ENTITY_TYPE_VIDEO_DEVICE:
+ * The entity is embedded in a struct video_device instance.
+ * @MEDIA_ENTITY_TYPE_V4L2_SUBDEV:
+ * The entity is embedded in a struct v4l2_subdev instance.
+ *
+ * Media entity objects are often not instantiated directly, but the media
+ * entity structure is inherited by (through embedding) other subsystem-specific
+ * structures. The media entity type identifies the type of the subclass
+ * structure that implements a media entity instance.
+ *
+ * This allows runtime type identification of media entities and safe casting to
+ * the correct object type. For instance, a media entity structure instance
+ * embedded in a v4l2_subdev structure instance will have the type
+ * %MEDIA_ENTITY_TYPE_V4L2_SUBDEV and can safely be cast to a &v4l2_subdev
+ * structure using the container_of() macro.
+ */
+enum media_entity_type {
+ MEDIA_ENTITY_TYPE_BASE,
+ MEDIA_ENTITY_TYPE_VIDEO_DEVICE,
+ MEDIA_ENTITY_TYPE_V4L2_SUBDEV,
+};
+
+/**
+ * struct media_entity - A media entity graph object.
+ *
+ * @graph_obj: Embedded structure containing the media object common data.
+ * @name: Entity name.
+ * @obj_type: Type of the object that implements the media_entity.
+ * @function: Entity main function, as defined in
+ * :ref:`include/uapi/linux/media.h <media_header>`
+ * (seek for ``MEDIA_ENT_F_*``)
+ * @flags: Entity flags, as defined in
+ * :ref:`include/uapi/linux/media.h <media_header>`
+ * (seek for ``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
+ * @internal_idx: An unique internal entity specific number. The numbers are
+ * re-used if entities are unregistered or registered again.
+ * @pads: Pads array with the size defined by @num_pads.
+ * @links: List of data links.
+ * @ops: Entity operations.
+ * @use_count: Use count for the entity.
+ * @info: Union with devnode information. Kept just for backward
+ * compatibility.
+ * @info.dev: Contains device major and minor info.
+ * @info.dev.major: device node major, if the device is a devnode.
+ * @info.dev.minor: device node minor, if the device is a devnode.
+ * @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::
+ *
+ * The @use_count reference count must never be negative, but is a signed
+ * integer on purpose: a simple ``WARN_ON(<0)`` check can be used to detect
+ * reference count bugs that would make it negative.
+ */
+struct media_entity {
+ struct media_gobj graph_obj; /* must be first field in struct */
+ const char *name;
+ enum media_entity_type obj_type;
+ u32 function;
+ unsigned long flags;
+
+ u16 num_pads;
+ u16 num_links;
+ u16 num_backlinks;
+ int internal_idx;
+
+ struct media_pad *pads;
+ struct list_head links;
+
+ const struct media_entity_operations *ops;
+
+ int use_count;
+
+ union {
+ struct {
+ u32 major;
+ u32 minor;
+ } dev;
+ } info;
+};
+
+/**
+ * media_entity_for_each_pad - Iterate on all pads in an entity
+ * @entity: The entity the pads belong to
+ * @iter: The iterator pad
+ *
+ * Iterate on all pads in a media entity.
+ */
+#define media_entity_for_each_pad(entity, iter) \
+ for (iter = (entity)->pads; \
+ iter < &(entity)->pads[(entity)->num_pads]; \
+ ++iter)
+
+/**
+ * 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
+ * :ref:`include/uapi/linux/media.h <media_header>`
+ * (seek for ``MEDIA_INTF_T_*``)
+ * @flags: Interface flags as defined in
+ * :ref:`include/uapi/linux/media.h <media_header>`
+ * (seek for ``MEDIA_INTF_FL_*``)
+ *
+ * .. note::
+ *
+ * Currently, no flags for &media_interface is defined.
+ */
+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;
+};
+
+/**
+ * media_entity_id() - return the media entity graph object id
+ *
+ * @entity: pointer to &media_entity
+ */
+static inline u32 media_entity_id(struct media_entity *entity)
+{
+ return entity->graph_obj.id;
+}
+
+/**
+ * media_type() - return the media object type
+ *
+ * @gobj: Pointer to the struct &media_gobj graph object
+ */
+static inline enum media_gobj_type media_type(struct media_gobj *gobj)
+{
+ return gobj->id >> MEDIA_BITS_PER_ID;
+}
+
+/**
+ * media_id() - return the media object ID
+ *
+ * @gobj: Pointer to the struct &media_gobj graph object
+ */
+static inline u32 media_id(struct media_gobj *gobj)
+{
+ return gobj->id & MEDIA_ID_MASK;
+}
+
+/**
+ * media_gobj_gen_id() - encapsulates type and ID on at the object ID
+ *
+ * @type: object type as define at enum &media_gobj_type.
+ * @local_id: next ID, from struct &media_device.id.
+ */
+static inline u32 media_gobj_gen_id(enum media_gobj_type type, u64 local_id)
+{
+ u32 id;
+
+ id = type << MEDIA_BITS_PER_ID;
+ id |= local_id & MEDIA_ID_MASK;
+
+ return id;
+}
+
+/**
+ * is_media_entity_v4l2_video_device() - Check if the entity is a video_device
+ * @entity: pointer to entity
+ *
+ * Return: %true if the entity is an instance of a video_device object and can
+ * safely be cast to a struct video_device using the container_of() macro, or
+ * %false otherwise.
+ */
+static inline bool is_media_entity_v4l2_video_device(struct media_entity *entity)
+{
+ return entity && entity->obj_type == MEDIA_ENTITY_TYPE_VIDEO_DEVICE;
+}
+
+/**
+ * is_media_entity_v4l2_subdev() - Check if the entity is a v4l2_subdev
+ * @entity: pointer to entity
+ *
+ * Return: %true if the entity is an instance of a &v4l2_subdev object and can
+ * safely be cast to a struct &v4l2_subdev using the container_of() macro, or
+ * %false otherwise.
+ */
+static inline bool is_media_entity_v4l2_subdev(struct media_entity *entity)
+{
+ return entity && entity->obj_type == MEDIA_ENTITY_TYPE_V4L2_SUBDEV;
+}
+
+/**
+ * media_entity_enum_init - Initialise an entity enumeration
+ *
+ * @ent_enum: Entity enumeration to be initialised
+ * @mdev: The related media device
+ *
+ * Return: zero on success or a negative error code.
+ */
+__must_check int media_entity_enum_init(struct media_entity_enum *ent_enum,
+ struct media_device *mdev);
+
+/**
+ * media_entity_enum_cleanup - Release resources of an entity enumeration
+ *
+ * @ent_enum: Entity enumeration to be released
+ */
+void media_entity_enum_cleanup(struct media_entity_enum *ent_enum);
+
+/**
+ * media_entity_enum_zero - Clear the entire enum
+ *
+ * @ent_enum: Entity enumeration to be cleared
+ */
+static inline void media_entity_enum_zero(struct media_entity_enum *ent_enum)
+{
+ bitmap_zero(ent_enum->bmap, ent_enum->idx_max);
+}
+
+/**
+ * media_entity_enum_set - Mark a single entity in the enum
+ *
+ * @ent_enum: Entity enumeration
+ * @entity: Entity to be marked
+ */
+static inline void media_entity_enum_set(struct media_entity_enum *ent_enum,
+ struct media_entity *entity)
+{
+ if (WARN_ON(entity->internal_idx >= ent_enum->idx_max))
+ return;
+
+ __set_bit(entity->internal_idx, ent_enum->bmap);
+}
+
+/**
+ * media_entity_enum_clear - Unmark a single entity in the enum
+ *
+ * @ent_enum: Entity enumeration
+ * @entity: Entity to be unmarked
+ */
+static inline void media_entity_enum_clear(struct media_entity_enum *ent_enum,
+ struct media_entity *entity)
+{
+ if (WARN_ON(entity->internal_idx >= ent_enum->idx_max))
+ return;
+
+ __clear_bit(entity->internal_idx, ent_enum->bmap);
+}
+
+/**
+ * media_entity_enum_test - Test whether the entity is marked
+ *
+ * @ent_enum: Entity enumeration
+ * @entity: Entity to be tested
+ *
+ * Returns %true if the entity was marked.
+ */
+static inline bool media_entity_enum_test(struct media_entity_enum *ent_enum,
+ struct media_entity *entity)
+{
+ if (WARN_ON(entity->internal_idx >= ent_enum->idx_max))
+ return true;
+
+ return test_bit(entity->internal_idx, ent_enum->bmap);
+}
+
+/**
+ * media_entity_enum_test_and_set - Test whether the entity is marked,
+ * and mark it
+ *
+ * @ent_enum: Entity enumeration
+ * @entity: Entity to be tested
+ *
+ * Returns %true if the entity was marked, and mark it before doing so.
+ */
+static inline bool
+media_entity_enum_test_and_set(struct media_entity_enum *ent_enum,
+ struct media_entity *entity)
+{
+ if (WARN_ON(entity->internal_idx >= ent_enum->idx_max))
+ return true;
+
+ return __test_and_set_bit(entity->internal_idx, ent_enum->bmap);
+}
+
+/**
+ * media_entity_enum_empty - Test whether the entire enum is empty
+ *
+ * @ent_enum: Entity enumeration
+ *
+ * Return: %true if the entity was empty.
+ */
+static inline bool media_entity_enum_empty(struct media_entity_enum *ent_enum)
+{
+ return bitmap_empty(ent_enum->bmap, ent_enum->idx_max);
+}
+
+/**
+ * media_entity_enum_intersects - Test whether two enums intersect
+ *
+ * @ent_enum1: First entity enumeration
+ * @ent_enum2: Second entity enumeration
+ *
+ * Return: %true if entity enumerations @ent_enum1 and @ent_enum2 intersect,
+ * otherwise %false.
+ */
+static inline bool media_entity_enum_intersects(
+ struct media_entity_enum *ent_enum1,
+ struct media_entity_enum *ent_enum2)
+{
+ WARN_ON(ent_enum1->idx_max != ent_enum2->idx_max);
+
+ return bitmap_intersects(ent_enum1->bmap, ent_enum2->bmap,
+ min(ent_enum1->idx_max, ent_enum2->idx_max));
+}
+
+/**
+ * gobj_to_entity - returns the struct &media_entity pointer from the
+ * @gobj contained on it.
+ *
+ * @gobj: Pointer to the struct &media_gobj graph object
+ */
+#define gobj_to_entity(gobj) \
+ container_of(gobj, struct media_entity, graph_obj)
+
+/**
+ * gobj_to_pad - returns the struct &media_pad pointer from the
+ * @gobj contained on it.
+ *
+ * @gobj: Pointer to the struct &media_gobj graph object
+ */
+#define gobj_to_pad(gobj) \
+ container_of(gobj, struct media_pad, graph_obj)
+
+/**
+ * gobj_to_link - returns the struct &media_link pointer from the
+ * @gobj contained on it.
+ *
+ * @gobj: Pointer to the struct &media_gobj graph object
+ */
+#define gobj_to_link(gobj) \
+ container_of(gobj, struct media_link, graph_obj)
+
+/**
+ * gobj_to_intf - returns the struct &media_interface pointer from the
+ * @gobj contained on it.
+ *
+ * @gobj: Pointer to the struct &media_gobj graph object
+ */
+#define gobj_to_intf(gobj) \
+ container_of(gobj, struct media_interface, graph_obj)
+
+/**
+ * intf_to_devnode - returns the struct media_intf_devnode pointer from the
+ * @intf contained on it.
+ *
+ * @intf: Pointer to struct &media_intf_devnode
+ */
+#define intf_to_devnode(intf) \
+ container_of(intf, struct media_intf_devnode, intf)
+
+/**
+ * media_gobj_create - Initialize a graph object
+ *
+ * @mdev: Pointer to the &media_device that contains the object
+ * @type: Type of the object
+ * @gobj: Pointer to the struct &media_gobj graph object
+ *
+ * This routine initializes the embedded struct &media_gobj inside a
+ * media graph object. It is called automatically if ``media_*_create``
+ * function calls are used. However, if the object (entity, link, pad,
+ * interface) is embedded on some other object, this function should be
+ * called before registering the object at the media controller.
+ */
+void media_gobj_create(struct media_device *mdev,
+ enum media_gobj_type type,
+ struct media_gobj *gobj);
+
+/**
+ * media_gobj_destroy - Stop using a graph object on a media device
+ *
+ * @gobj: Pointer to the struct &media_gobj graph object
+ *
+ * This should be called by all routines like media_device_unregister()
+ * that remove/destroy media graph objects.
+ */
+void media_gobj_destroy(struct media_gobj *gobj);
+
+/**
+ * media_entity_pads_init() - Initialize the entity pads
+ *
+ * @entity: entity where the pads belong
+ * @num_pads: total number of sink and source pads
+ * @pads: Array of @num_pads pads.
+ *
+ * The pads array is managed by the entity driver and passed to
+ * media_entity_pads_init() where its pointer will be stored in the
+ * &media_entity structure.
+ *
+ * If no pads are needed, drivers could either directly fill
+ * &media_entity->num_pads with 0 and &media_entity->pads with %NULL or call
+ * this function that will do the same.
+ *
+ * As the number of pads is known in advance, the pads array is not allocated
+ * dynamically but is managed by the entity driver. Most drivers will embed the
+ * pads array in a driver-specific structure, avoiding dynamic allocation.
+ *
+ * Drivers must set the direction of every pad in the pads array before calling
+ * media_entity_pads_init(). The function will initialize the other pads fields.
+ */
+int media_entity_pads_init(struct media_entity *entity, u16 num_pads,
+ struct media_pad *pads);
+
+/**
+ * media_entity_cleanup() - free resources associated with an entity
+ *
+ * @entity: entity where the pads belong
+ *
+ * This function must be called during the cleanup phase after unregistering
+ * the entity (currently, it does nothing).
+ *
+ * Calling media_entity_cleanup() on a media_entity whose memory has been
+ * zeroed but that has not been initialized with media_entity_pad_init() is
+ * valid and is a no-op.
+ */
+#if IS_ENABLED(CONFIG_MEDIA_CONTROLLER)
+static inline void media_entity_cleanup(struct media_entity *entity) {}
+#else
+#define media_entity_cleanup(entity) do { } while (false)
+#endif
+
+/**
+ * media_get_pad_index() - retrieves a pad index from an entity
+ *
+ * @entity: entity where the pads belong
+ * @pad_type: the type of the pad, one of MEDIA_PAD_FL_* pad types
+ * @sig_type: type of signal of the pad to be search
+ *
+ * This helper function finds the first pad index inside an entity that
+ * satisfies both @is_sink and @sig_type conditions.
+ *
+ * Return:
+ *
+ * On success, return the pad number. If the pad was not found or the media
+ * entity is a NULL pointer, return -EINVAL.
+ */
+int media_get_pad_index(struct media_entity *entity, u32 pad_type,
+ enum media_pad_signal_type sig_type);
+
+/**
+ * media_create_pad_link() - creates a link between two entities.
+ *
+ * @source: pointer to &media_entity of the source pad.
+ * @source_pad: number of the source pad in the pads array
+ * @sink: pointer to &media_entity of the sink pad.
+ * @sink_pad: number of the sink pad in the pads array.
+ * @flags: Link flags, as defined in
+ * :ref:`include/uapi/linux/media.h <media_header>`
+ * ( seek for ``MEDIA_LNK_FL_*``)
+ *
+ * Valid values for flags:
+ *
+ * %MEDIA_LNK_FL_ENABLED
+ * Indicates that the link is enabled and can be used to transfer media data.
+ * When two or more links target a sink pad, only one of them can be
+ * enabled at a time.
+ *
+ * %MEDIA_LNK_FL_IMMUTABLE
+ * Indicates that the link enabled state can't be modified at runtime. If
+ * %MEDIA_LNK_FL_IMMUTABLE is set, then %MEDIA_LNK_FL_ENABLED must also be
+ * set, since an immutable link is always enabled.
+ *
+ * .. note::
+ *
+ * Before calling this function, media_entity_pads_init() and
+ * media_device_register_entity() should be called previously for both ends.
+ */
+__must_check int media_create_pad_link(struct media_entity *source,
+ u16 source_pad, struct media_entity *sink,
+ u16 sink_pad, u32 flags);
+
+/**
+ * media_create_pad_links() - creates a link between two entities.
+ *
+ * @mdev: Pointer to the media_device that contains the object
+ * @source_function: Function of the source entities. Used only if @source is
+ * NULL.
+ * @source: pointer to &media_entity of the source pad. If NULL, it will use
+ * all entities that matches the @sink_function.
+ * @source_pad: number of the source pad in the pads array
+ * @sink_function: Function of the sink entities. Used only if @sink is NULL.
+ * @sink: pointer to &media_entity of the sink pad. If NULL, it will use
+ * all entities that matches the @sink_function.
+ * @sink_pad: number of the sink pad in the pads array.
+ * @flags: Link flags, as defined in include/uapi/linux/media.h.
+ * @allow_both_undefined: if %true, then both @source and @sink can be NULL.
+ * In such case, it will create a crossbar between all entities that
+ * matches @source_function to all entities that matches @sink_function.
+ * If %false, it will return 0 and won't create any link if both @source
+ * and @sink are NULL.
+ *
+ * Valid values for flags:
+ *
+ * A %MEDIA_LNK_FL_ENABLED flag indicates that the link is enabled and can be
+ * used to transfer media data. If multiple links are created and this
+ * flag is passed as an argument, only the first created link will have
+ * this flag.
+ *
+ * A %MEDIA_LNK_FL_IMMUTABLE flag indicates that the link enabled state can't
+ * be modified at runtime. If %MEDIA_LNK_FL_IMMUTABLE is set, then
+ * %MEDIA_LNK_FL_ENABLED must also be set since an immutable link is
+ * always enabled.
+ *
+ * It is common for some devices to have multiple source and/or sink entities
+ * of the same type that should be linked. While media_create_pad_link()
+ * creates link by link, this function is meant to allow 1:n, n:1 and even
+ * cross-bar (n:n) links.
+ *
+ * .. note::
+ *
+ * Before calling this function, media_entity_pads_init() and
+ * media_device_register_entity() should be called previously for the
+ * entities to be linked.
+ */
+int media_create_pad_links(const struct media_device *mdev,
+ const u32 source_function,
+ struct media_entity *source,
+ const u16 source_pad,
+ const u32 sink_function,
+ struct media_entity *sink,
+ const u16 sink_pad,
+ u32 flags,
+ const bool allow_both_undefined);
+
+void __media_entity_remove_links(struct media_entity *entity);
+
+/**
+ * media_entity_remove_links() - remove all links associated with an entity
+ *
+ * @entity: pointer to &media_entity
+ *
+ * .. note::
+ *
+ * This is called automatically when an entity is unregistered via
+ * media_device_register_entity().
+ */
+void media_entity_remove_links(struct media_entity *entity);
+
+/**
+ * __media_entity_setup_link - Configure a media link without locking
+ * @link: The link being configured
+ * @flags: Link configuration flags
+ *
+ * The bulk of link setup is handled by the two entities connected through the
+ * link. This function notifies both entities of the link configuration change.
+ *
+ * If the link is immutable or if the current and new configuration are
+ * identical, return immediately.
+ *
+ * The user is expected to hold link->source->parent->mutex. If not,
+ * media_entity_setup_link() should be used instead.
+ */
+int __media_entity_setup_link(struct media_link *link, u32 flags);
+
+/**
+ * media_entity_setup_link() - changes the link flags properties in runtime
+ *
+ * @link: pointer to &media_link
+ * @flags: the requested new link flags
+ *
+ * The only configurable property is the %MEDIA_LNK_FL_ENABLED link flag
+ * to enable/disable a link. Links marked with the
+ * %MEDIA_LNK_FL_IMMUTABLE link flag can not be enabled or disabled.
+ *
+ * When a link is enabled or disabled, the media framework calls the
+ * link_setup operation for the two entities at the source and sink of the
+ * link, in that order. If the second link_setup call fails, another
+ * link_setup call is made on the first entity to restore the original link
+ * flags.
+ *
+ * Media device drivers can be notified of link setup operations by setting the
+ * &media_device.link_notify pointer to a callback function. If provided, the
+ * notification callback will be called before enabling and after disabling
+ * links.
+ *
+ * Entity drivers must implement the link_setup operation if any of their links
+ * is non-immutable. The operation must either configure the hardware or store
+ * the configuration information to be applied later.
+ *
+ * Link configuration must not have any side effect on other links. If an
+ * enabled link at a sink pad prevents another link at the same pad from
+ * being enabled, the link_setup operation must return %-EBUSY and can't
+ * implicitly disable the first enabled link.
+ *
+ * .. note::
+ *
+ * The valid values of the flags for the link is the same as described
+ * on media_create_pad_link(), for pad to pad links or the same as described
+ * on media_create_intf_link(), for interface to entity links.
+ */
+int media_entity_setup_link(struct media_link *link, u32 flags);
+
+/**
+ * media_entity_find_link - Find a link between two pads
+ * @source: Source pad
+ * @sink: Sink pad
+ *
+ * Return: returns a pointer to the link between the two entities. If no
+ * such link exists, return %NULL.
+ */
+struct media_link *media_entity_find_link(struct media_pad *source,
+ struct media_pad *sink);
+
+/**
+ * media_pad_remote_pad_first - Find the first pad at the remote end of a link
+ * @pad: Pad at the local end of the link
+ *
+ * Search for a remote pad connected to the given pad by iterating over all
+ * links originating or terminating at that pad until an enabled link is found.
+ *
+ * Return: returns a pointer to the pad at the remote end of the first found
+ * enabled link, or %NULL if no enabled link has been found.
+ */
+struct media_pad *media_pad_remote_pad_first(const struct media_pad *pad);
+
+/**
+ * media_pad_remote_pad_unique - Find a remote pad connected to a pad
+ * @pad: The pad
+ *
+ * Search for and return a remote pad connected to @pad through an enabled
+ * link. If multiple (or no) remote pads are found, an error is returned.
+ *
+ * The uniqueness constraint makes this helper function suitable for entities
+ * that support a single active source at a time on a given pad.
+ *
+ * Return: A pointer to the remote pad, or one of the following error pointers
+ * if an error occurs:
+ *
+ * * -ENOTUNIQ - Multiple links are enabled
+ * * -ENOLINK - No connected pad found
+ */
+struct media_pad *media_pad_remote_pad_unique(const struct media_pad *pad);
+
+/**
+ * media_entity_remote_pad_unique - Find a remote pad connected to an entity
+ * @entity: The entity
+ * @type: The type of pad to find (MEDIA_PAD_FL_SINK or MEDIA_PAD_FL_SOURCE)
+ *
+ * Search for and return a remote pad of @type connected to @entity through an
+ * enabled link. If multiple (or no) remote pads match these criteria, an error
+ * is returned.
+ *
+ * The uniqueness constraint makes this helper function suitable for entities
+ * that support a single active source or sink at a time.
+ *
+ * Return: A pointer to the remote pad, or one of the following error pointers
+ * if an error occurs:
+ *
+ * * -ENOTUNIQ - Multiple links are enabled
+ * * -ENOLINK - No connected pad found
+ */
+struct media_pad *
+media_entity_remote_pad_unique(const struct media_entity *entity,
+ unsigned int type);
+
+/**
+ * media_entity_remote_source_pad_unique - Find a remote source pad connected to
+ * an entity
+ * @entity: The entity
+ *
+ * Search for and return a remote source pad connected to @entity through an
+ * enabled link. If multiple (or no) remote pads match these criteria, an error
+ * is returned.
+ *
+ * The uniqueness constraint makes this helper function suitable for entities
+ * that support a single active source at a time.
+ *
+ * Return: A pointer to the remote pad, or one of the following error pointers
+ * if an error occurs:
+ *
+ * * -ENOTUNIQ - Multiple links are enabled
+ * * -ENOLINK - No connected pad found
+ */
+static inline struct media_pad *
+media_entity_remote_source_pad_unique(const struct media_entity *entity)
+{
+ return media_entity_remote_pad_unique(entity, MEDIA_PAD_FL_SOURCE);
+}
+
+/**
+ * media_pad_is_streaming - Test if a pad is part of a streaming pipeline
+ * @pad: The pad
+ *
+ * Return: True if the pad is part of a pipeline started with the
+ * media_pipeline_start() function, false otherwise.
+ */
+static inline bool media_pad_is_streaming(const struct media_pad *pad)
+{
+ return pad->pipe;
+}
+
+/**
+ * media_entity_is_streaming - Test if an entity is part of a streaming pipeline
+ * @entity: The entity
+ *
+ * Return: True if the entity is part of a pipeline started with the
+ * media_pipeline_start() function, false otherwise.
+ */
+static inline bool media_entity_is_streaming(const struct media_entity *entity)
+{
+ struct media_pad *pad;
+
+ media_entity_for_each_pad(entity, pad) {
+ if (media_pad_is_streaming(pad))
+ return true;
+ }
+
+ return false;
+}
+
+/**
+ * media_entity_pipeline - Get the media pipeline an entity is part of
+ * @entity: The entity
+ *
+ * DEPRECATED: use media_pad_pipeline() instead.
+ *
+ * This function returns the media pipeline that an entity has been associated
+ * with when constructing the pipeline with media_pipeline_start(). The pointer
+ * remains valid until media_pipeline_stop() is called.
+ *
+ * In general, entities can be part of multiple pipelines, when carrying
+ * multiple streams (either on different pads, or on the same pad using
+ * multiplexed streams). This function is to be used only for entities that
+ * do not support multiple pipelines.
+ *
+ * Return: The media_pipeline the entity is part of, or NULL if the entity is
+ * not part of any pipeline.
+ */
+struct media_pipeline *media_entity_pipeline(struct media_entity *entity);
+
+/**
+ * media_pad_pipeline - Get the media pipeline a pad is part of
+ * @pad: The pad
+ *
+ * This function returns the media pipeline that a pad has been associated
+ * with when constructing the pipeline with media_pipeline_start(). The pointer
+ * remains valid until media_pipeline_stop() is called.
+ *
+ * Return: The media_pipeline the pad is part of, or NULL if the pad is
+ * not part of any pipeline.
+ */
+struct media_pipeline *media_pad_pipeline(struct media_pad *pad);
+
+/**
+ * media_entity_get_fwnode_pad - Get pad number from fwnode
+ *
+ * @entity: The entity
+ * @fwnode: Pointer to the fwnode_handle which should be used to find the pad
+ * @direction_flags: Expected direction of the pad, as defined in
+ * :ref:`include/uapi/linux/media.h <media_header>`
+ * (seek for ``MEDIA_PAD_FL_*``)
+ *
+ * This function can be used to resolve the media pad number from
+ * a fwnode. This is useful for devices which use more complex
+ * mappings of media pads.
+ *
+ * If the entity does not implement the get_fwnode_pad() operation
+ * then this function searches the entity for the first pad that
+ * matches the @direction_flags.
+ *
+ * Return: returns the pad number on success or a negative error code.
+ */
+int media_entity_get_fwnode_pad(struct media_entity *entity,
+ const struct fwnode_handle *fwnode,
+ unsigned long direction_flags);
+
+/**
+ * media_graph_walk_init - Allocate resources used by graph walk.
+ *
+ * @graph: Media graph structure that will be used to walk the graph
+ * @mdev: Pointer to the &media_device that contains the object
+ *
+ * This function is deprecated, use media_pipeline_for_each_pad() instead.
+ *
+ * The caller is required to hold the media_device graph_mutex during the graph
+ * walk until the graph state is released.
+ *
+ * Returns zero on success or a negative error code otherwise.
+ */
+__must_check int media_graph_walk_init(
+ struct media_graph *graph, struct media_device *mdev);
+
+/**
+ * media_graph_walk_cleanup - Release resources used by graph walk.
+ *
+ * @graph: Media graph structure that will be used to walk the graph
+ *
+ * This function is deprecated, use media_pipeline_for_each_pad() instead.
+ */
+void media_graph_walk_cleanup(struct media_graph *graph);
+
+/**
+ * media_graph_walk_start - Start walking the media graph at a
+ * given entity
+ *
+ * @graph: Media graph structure that will be used to walk the graph
+ * @entity: Starting entity
+ *
+ * This function is deprecated, use media_pipeline_for_each_pad() instead.
+ *
+ * Before using this function, media_graph_walk_init() must be
+ * used to allocate resources used for walking the graph. This
+ * function initializes the graph traversal structure to walk the
+ * entities graph starting at the given entity. The traversal
+ * structure must not be modified by the caller during graph
+ * traversal. After the graph walk, the resources must be released
+ * using media_graph_walk_cleanup().
+ */
+void media_graph_walk_start(struct media_graph *graph,
+ struct media_entity *entity);
+
+/**
+ * media_graph_walk_next - Get the next entity in the graph
+ * @graph: Media graph structure
+ *
+ * This function is deprecated, use media_pipeline_for_each_pad() instead.
+ *
+ * Perform a depth-first traversal of the given media entities graph.
+ *
+ * The graph structure must have been previously initialized with a call to
+ * media_graph_walk_start().
+ *
+ * Return: returns the next entity in the graph or %NULL if the whole graph
+ * have been traversed.
+ */
+struct media_entity *media_graph_walk_next(struct media_graph *graph);
+
+/**
+ * media_pipeline_start - Mark a pipeline as streaming
+ * @pad: Starting pad
+ * @pipe: Media pipeline to be assigned to all pads in the pipeline.
+ *
+ * Mark all pads connected to a given pad through enabled links, either
+ * directly or indirectly, as streaming. The given pipeline object is assigned
+ * to every pad in the pipeline and stored in the media_pad pipe field.
+ *
+ * Calls to this function can be nested, in which case the same number of
+ * media_pipeline_stop() calls will be required to stop streaming. The
+ * pipeline pointer must be identical for all nested calls to
+ * media_pipeline_start().
+ */
+__must_check int media_pipeline_start(struct media_pad *pad,
+ struct media_pipeline *pipe);
+/**
+ * __media_pipeline_start - Mark a pipeline as streaming
+ *
+ * @pad: Starting pad
+ * @pipe: Media pipeline to be assigned to all pads in the pipeline.
+ *
+ * ..note:: This is the non-locking version of media_pipeline_start()
+ */
+__must_check int __media_pipeline_start(struct media_pad *pad,
+ struct media_pipeline *pipe);
+
+/**
+ * media_pipeline_stop - Mark a pipeline as not streaming
+ * @pad: Starting pad
+ *
+ * Mark all pads connected to a given pad through enabled links, either
+ * directly or indirectly, as not streaming. The media_pad pipe field is
+ * reset to %NULL.
+ *
+ * If multiple calls to media_pipeline_start() have been made, the same
+ * number of calls to this function are required to mark the pipeline as not
+ * streaming.
+ */
+void media_pipeline_stop(struct media_pad *pad);
+
+/**
+ * __media_pipeline_stop - Mark a pipeline as not streaming
+ *
+ * @pad: Starting pad
+ *
+ * .. note:: This is the non-locking version of media_pipeline_stop()
+ */
+void __media_pipeline_stop(struct media_pad *pad);
+
+struct media_pad *
+__media_pipeline_pad_iter_next(struct media_pipeline *pipe,
+ struct media_pipeline_pad_iter *iter,
+ struct media_pad *pad);
+
+/**
+ * media_pipeline_for_each_pad - Iterate on all pads in a media pipeline
+ * @pipe: The pipeline
+ * @iter: The iterator (struct media_pipeline_pad_iter)
+ * @pad: The iterator pad
+ *
+ * Iterate on all pads in a media pipeline. This is only valid after the
+ * pipeline has been built with media_pipeline_start() and before it gets
+ * destroyed with media_pipeline_stop().
+ */
+#define media_pipeline_for_each_pad(pipe, iter, pad) \
+ for (pad = __media_pipeline_pad_iter_next((pipe), iter, NULL); \
+ pad != NULL; \
+ pad = __media_pipeline_pad_iter_next((pipe), iter, pad))
+
+/**
+ * media_pipeline_entity_iter_init - Initialize a pipeline entity iterator
+ * @pipe: The pipeline
+ * @iter: The iterator
+ *
+ * This function must be called to initialize the iterator before using it in a
+ * media_pipeline_for_each_entity() loop. The iterator must be destroyed by a
+ * call to media_pipeline_entity_iter_cleanup after the loop (including in code
+ * paths that break from the loop).
+ *
+ * The same iterator can be used in multiple consecutive loops without being
+ * destroyed and reinitialized.
+ *
+ * Return: 0 on success or a negative error code otherwise.
+ */
+int media_pipeline_entity_iter_init(struct media_pipeline *pipe,
+ struct media_pipeline_entity_iter *iter);
+
+/**
+ * media_pipeline_entity_iter_cleanup - Destroy a pipeline entity iterator
+ * @iter: The iterator
+ *
+ * This function must be called to destroy iterators initialized with
+ * media_pipeline_entity_iter_init().
+ */
+void media_pipeline_entity_iter_cleanup(struct media_pipeline_entity_iter *iter);
+
+struct media_entity *
+__media_pipeline_entity_iter_next(struct media_pipeline *pipe,
+ struct media_pipeline_entity_iter *iter,
+ struct media_entity *entity);
+
+/**
+ * media_pipeline_for_each_entity - Iterate on all entities in a media pipeline
+ * @pipe: The pipeline
+ * @iter: The iterator (struct media_pipeline_entity_iter)
+ * @entity: The iterator entity
+ *
+ * Iterate on all entities in a media pipeline. This is only valid after the
+ * pipeline has been built with media_pipeline_start() and before it gets
+ * destroyed with media_pipeline_stop(). The iterator must be initialized with
+ * media_pipeline_entity_iter_init() before iteration, and destroyed with
+ * media_pipeline_entity_iter_cleanup() after (including in code paths that
+ * break from the loop).
+ */
+#define media_pipeline_for_each_entity(pipe, iter, entity) \
+ for (entity = __media_pipeline_entity_iter_next((pipe), iter, NULL); \
+ entity != NULL; \
+ entity = __media_pipeline_entity_iter_next((pipe), iter, entity))
+
+/**
+ * media_pipeline_alloc_start - Mark a pipeline as streaming
+ * @pad: Starting pad
+ *
+ * media_pipeline_alloc_start() is similar to media_pipeline_start() but instead
+ * of working on a given pipeline the function will use an existing pipeline if
+ * the pad is already part of a pipeline, or allocate a new pipeline.
+ *
+ * Calls to media_pipeline_alloc_start() must be matched with
+ * media_pipeline_stop().
+ */
+__must_check int media_pipeline_alloc_start(struct media_pad *pad);
+
+/**
+ * media_devnode_create() - creates and initializes a device node interface
+ *
+ * @mdev: pointer to struct &media_device
+ * @type: type of the interface, as given by
+ * :ref:`include/uapi/linux/media.h <media_header>`
+ * ( seek for ``MEDIA_INTF_T_*``) macros.
+ * @flags: Interface flags, as defined in
+ * :ref:`include/uapi/linux/media.h <media_header>`
+ * ( seek for ``MEDIA_INTF_FL_*``)
+ * @major: Device node major number.
+ * @minor: Device node minor number.
+ *
+ * Return: if succeeded, returns a pointer to the newly allocated
+ * &media_intf_devnode pointer.
+ *
+ * .. note::
+ *
+ * Currently, no flags for &media_interface is defined.
+ */
+struct media_intf_devnode *
+__must_check media_devnode_create(struct media_device *mdev,
+ u32 type, u32 flags,
+ u32 major, u32 minor);
+/**
+ * media_devnode_remove() - removes a device node interface
+ *
+ * @devnode: pointer to &media_intf_devnode to be freed.
+ *
+ * When a device node interface is removed, all links to it are automatically
+ * removed.
+ */
+void media_devnode_remove(struct media_intf_devnode *devnode);
+
+/**
+ * media_create_intf_link() - creates a link between an entity and an interface
+ *
+ * @entity: pointer to %media_entity
+ * @intf: pointer to %media_interface
+ * @flags: Link flags, as defined in
+ * :ref:`include/uapi/linux/media.h <media_header>`
+ * ( seek for ``MEDIA_LNK_FL_*``)
+ *
+ *
+ * Valid values for flags:
+ *
+ * %MEDIA_LNK_FL_ENABLED
+ * Indicates that the interface is connected to the entity hardware.
+ * That's the default value for interfaces. An interface may be disabled if
+ * the hardware is busy due to the usage of some other interface that it is
+ * currently controlling the hardware.
+ *
+ * A typical example is an hybrid TV device that handle only one type of
+ * stream on a given time. So, when the digital TV is streaming,
+ * the V4L2 interfaces won't be enabled, as such device is not able to
+ * also stream analog TV or radio.
+ *
+ * .. note::
+ *
+ * Before calling this function, media_devnode_create() should be called for
+ * the interface and media_device_register_entity() should be called for the
+ * interface that will be part of the link.
+ */
+struct media_link *
+__must_check media_create_intf_link(struct media_entity *entity,
+ struct media_interface *intf,
+ u32 flags);
+/**
+ * __media_remove_intf_link() - remove a single interface link
+ *
+ * @link: pointer to &media_link.
+ *
+ * .. note:: This is an unlocked version of media_remove_intf_link()
+ */
+void __media_remove_intf_link(struct media_link *link);
+
+/**
+ * media_remove_intf_link() - remove a single interface link
+ *
+ * @link: pointer to &media_link.
+ *
+ * .. note:: Prefer to use this one, instead of __media_remove_intf_link()
+ */
+void media_remove_intf_link(struct media_link *link);
+
+/**
+ * __media_remove_intf_links() - remove all links associated with an interface
+ *
+ * @intf: pointer to &media_interface
+ *
+ * .. note:: This is an unlocked version of media_remove_intf_links().
+ */
+void __media_remove_intf_links(struct media_interface *intf);
+
+/**
+ * media_remove_intf_links() - remove all links associated with an interface
+ *
+ * @intf: pointer to &media_interface
+ *
+ * .. note::
+ *
+ * #) This is called automatically when an entity is unregistered via
+ * media_device_register_entity() and by media_devnode_remove().
+ *
+ * #) Prefer to use this one, instead of __media_remove_intf_links().
+ */
+void media_remove_intf_links(struct media_interface *intf);
+
+/**
+ * media_entity_call - Calls a struct media_entity_operations operation on
+ * an entity
+ *
+ * @entity: entity where the @operation will be called
+ * @operation: type of the operation. Should be the name of a member of
+ * struct &media_entity_operations.
+ *
+ * This helper function will check if @operation is not %NULL. On such case,
+ * it will issue a call to @operation\(@entity, @args\).
+ */
+
+#define media_entity_call(entity, operation, args...) \
+ (((entity)->ops && (entity)->ops->operation) ? \
+ (entity)->ops->operation((entity) , ##args) : -ENOIOCTLCMD)
+
+/**
+ * media_create_ancillary_link() - create an ancillary link between two
+ * instances of &media_entity
+ *
+ * @primary: pointer to the primary &media_entity
+ * @ancillary: pointer to the ancillary &media_entity
+ *
+ * Create an ancillary link between two entities, indicating that they
+ * represent two connected pieces of hardware that form a single logical unit.
+ * A typical example is a camera lens controller being linked to the sensor that
+ * it is supporting.
+ *
+ * The function sets both MEDIA_LNK_FL_ENABLED and MEDIA_LNK_FL_IMMUTABLE for
+ * the new link.
+ */
+struct media_link *
+media_create_ancillary_link(struct media_entity *primary,
+ struct media_entity *ancillary);
+
+/**
+ * __media_entity_next_link() - Iterate through a &media_entity's links
+ *
+ * @entity: pointer to the &media_entity
+ * @link: pointer to a &media_link to hold the iterated values
+ * @link_type: one of the MEDIA_LNK_FL_LINK_TYPE flags
+ *
+ * Return the next link against an entity matching a specific link type. This
+ * allows iteration through an entity's links whilst guaranteeing all of the
+ * returned links are of the given type.
+ */
+struct media_link *__media_entity_next_link(struct media_entity *entity,
+ struct media_link *link,
+ unsigned long link_type);
+
+/**
+ * for_each_media_entity_data_link() - Iterate through an entity's data links
+ *
+ * @entity: pointer to the &media_entity
+ * @link: pointer to a &media_link to hold the iterated values
+ *
+ * Iterate over a &media_entity's data links
+ */
+#define for_each_media_entity_data_link(entity, link) \
+ for (link = __media_entity_next_link(entity, NULL, \
+ MEDIA_LNK_FL_DATA_LINK); \
+ link; \
+ link = __media_entity_next_link(entity, link, \
+ MEDIA_LNK_FL_DATA_LINK))
+
+#endif