4 * Copyright (C) 2010 Nokia Corporation
6 * Contacts: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
7 * Sakari Ailus <sakari.ailus@iki.fi>
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License version 2 as
11 * published by the Free Software Foundation.
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
23 #ifndef _MEDIA_ENTITY_H
24 #define _MEDIA_ENTITY_H
26 #include <linux/bitmap.h>
27 #include <linux/kernel.h>
28 #include <linux/list.h>
29 #include <linux/media.h>
31 /* Enums used internally at the media controller to represent graphs */
34 * enum media_gobj_type - type of a graph object
36 * @MEDIA_GRAPH_ENTITY: Identify a media entity
37 * @MEDIA_GRAPH_PAD: Identify a media pad
38 * @MEDIA_GRAPH_LINK: Identify a media link
39 * @MEDIA_GRAPH_INTF_DEVNODE: Identify a media Kernel API interface via
42 enum media_gobj_type {
46 MEDIA_GRAPH_INTF_DEVNODE,
49 #define MEDIA_BITS_PER_TYPE 8
50 #define MEDIA_BITS_PER_LOCAL_ID (32 - MEDIA_BITS_PER_TYPE)
51 #define MEDIA_LOCAL_ID_MASK GENMASK(MEDIA_BITS_PER_LOCAL_ID - 1, 0)
53 /* Structs to represent the objects that belong to a media graph */
56 * struct media_gobj - Define a graph object.
58 * @mdev: Pointer to the struct media_device that owns the object
59 * @id: Non-zero object ID identifier. The ID should be unique
60 * inside a media_device, as it is composed by
61 * MEDIA_BITS_PER_TYPE to store the type plus
62 * MEDIA_BITS_PER_LOCAL_ID to store a per-type ID
63 * (called as "local ID").
64 * @list: List entry stored in one of the per-type mdev object lists
66 * All objects on the media graph should have this struct embedded
69 struct media_device *mdev;
71 struct list_head list;
74 #define MEDIA_ENTITY_ENUM_MAX_DEPTH 16
77 * The number of pads can't be bigger than the number of entities,
78 * as the worse-case scenario is to have one entity linked up to
81 #define MEDIA_ENTITY_MAX_PADS 63
84 * struct media_entity_enum - An enumeration of media entities.
86 * @bmap: Bit map in which each bit represents one entity at struct
87 * media_entity->internal_idx.
88 * @idx_max: Number of bits in bmap
90 struct media_entity_enum {
96 * struct media_entity_graph - Media graph traversal state
98 * @stack: Graph traversal stack; the stack contains information
99 * on the path the media entities to be walked and the
100 * links through which they were reached.
101 * @ent_enum: Visited entities
102 * @top: The top of the stack
104 struct media_entity_graph {
106 struct media_entity *entity;
107 struct list_head *link;
108 } stack[MEDIA_ENTITY_ENUM_MAX_DEPTH];
110 struct media_entity_enum ent_enum;
115 * struct media_pipeline - Media pipeline related information
117 * @streaming_count: Streaming start count - streaming stop count
118 * @graph: Media graph walk during pipeline start / stop
120 struct media_pipeline {
122 struct media_entity_graph graph;
126 * struct media_link - A link object part of a media graph.
128 * @graph_obj: Embedded structure containing the media object common data
129 * @list: Linked list associated with an entity or an interface that
131 * @gobj0: Part of a union. Used to get the pointer for the first
132 * graph_object of the link.
133 * @source: Part of a union. Used only if the first object (gobj0) is
134 * a pad. In that case, it represents the source pad.
135 * @intf: Part of a union. Used only if the first object (gobj0) is
137 * @gobj1: Part of a union. Used to get the pointer for the second
138 * graph_object of the link.
139 * @source: Part of a union. Used only if the second object (gobj1) is
140 * a pad. In that case, it represents the sink pad.
141 * @entity: Part of a union. Used only if the second object (gobj1) is
143 * @reverse: Pointer to the link for the reverse direction of a pad to pad
145 * @flags: Link flags, as defined in uapi/media.h (MEDIA_LNK_FL_*)
146 * @is_backlink: Indicate if the link is a backlink.
149 struct media_gobj graph_obj;
150 struct list_head list;
152 struct media_gobj *gobj0;
153 struct media_pad *source;
154 struct media_interface *intf;
157 struct media_gobj *gobj1;
158 struct media_pad *sink;
159 struct media_entity *entity;
161 struct media_link *reverse;
167 * struct media_pad - A media pad graph object.
169 * @graph_obj: Embedded structure containing the media object common data
170 * @entity: Entity this pad belongs to
171 * @index: Pad index in the entity pads array, numbered from 0 to n
172 * @flags: Pad flags, as defined in uapi/media.h (MEDIA_PAD_FL_*)
175 struct media_gobj graph_obj; /* must be first field in struct */
176 struct media_entity *entity;
182 * struct media_entity_operations - Media entity operations
183 * @link_setup: Notify the entity of link changes. The operation can
184 * return an error, in which case link setup will be
185 * cancelled. Optional.
186 * @link_validate: Return whether a link is valid from the entity point of
187 * view. The media_entity_pipeline_start() function
188 * validates all links by calling this operation. Optional.
190 struct media_entity_operations {
191 int (*link_setup)(struct media_entity *entity,
192 const struct media_pad *local,
193 const struct media_pad *remote, u32 flags);
194 int (*link_validate)(struct media_link *link);
198 * struct media_entity - A media entity graph object.
200 * @graph_obj: Embedded structure containing the media object common data.
201 * @name: Entity name.
202 * @function: Entity main function, as defined in uapi/media.h
204 * @flags: Entity flags, as defined in uapi/media.h (MEDIA_ENT_FL_*)
205 * @num_pads: Number of sink and source pads.
206 * @num_links: Total number of links, forward and back, enabled and disabled.
207 * @num_backlinks: Number of backlinks
208 * @internal_idx: An unique internal entity specific number. The numbers are
209 * re-used if entities are unregistered or registered again.
210 * @pads: Pads array with the size defined by @num_pads.
211 * @links: List of data links.
212 * @ops: Entity operations.
213 * @stream_count: Stream count for the entity.
214 * @use_count: Use count for the entity.
215 * @pipe: Pipeline this entity belongs to.
216 * @info: Union with devnode information. Kept just for backward
218 * @major: Devnode major number (zero if not applicable). Kept just
219 * for backward compatibility.
220 * @minor: Devnode minor number (zero if not applicable). Kept just
221 * for backward compatibility.
223 * NOTE: @stream_count and @use_count reference counts must never be
224 * negative, but are signed integers on purpose: a simple WARN_ON(<0) check
225 * can be used to detect reference count bugs that would make them negative.
227 struct media_entity {
228 struct media_gobj graph_obj; /* must be first field in struct */
238 struct media_pad *pads;
239 struct list_head links;
241 const struct media_entity_operations *ops;
243 /* Reference counts must never be negative, but are signed integers on
244 * purpose: a simple WARN_ON(<0) check can be used to detect reference
245 * count bugs that would make them negative.
250 struct media_pipeline *pipe;
261 * struct media_interface - A media interface graph object.
263 * @graph_obj: embedded graph object
264 * @links: List of links pointing to graph entities
265 * @type: Type of the interface as defined in the
266 * uapi/media/media.h header, e. g.
268 * @flags: Interface flags as defined in uapi/media/media.h
270 struct media_interface {
271 struct media_gobj graph_obj;
272 struct list_head links;
278 * struct media_intf_devnode - A media interface via a device node.
280 * @intf: embedded interface object
281 * @major: Major number of a device node
282 * @minor: Minor number of a device node
284 struct media_intf_devnode {
285 struct media_interface intf;
287 /* Should match the fields at media_v2_intf_devnode */
293 * media_entity_id() - return the media entity graph object id
295 * @entity: pointer to entity
297 static inline u32 media_entity_id(struct media_entity *entity)
299 return entity->graph_obj.id;
303 * media_type() - return the media object type
305 * @gobj: pointer to the media graph object
307 static inline enum media_gobj_type media_type(struct media_gobj *gobj)
309 return gobj->id >> MEDIA_BITS_PER_LOCAL_ID;
312 static inline u32 media_localid(struct media_gobj *gobj)
314 return gobj->id & MEDIA_LOCAL_ID_MASK;
317 static inline u32 media_gobj_gen_id(enum media_gobj_type type, u32 local_id)
321 id = type << MEDIA_BITS_PER_LOCAL_ID;
322 id |= local_id & MEDIA_LOCAL_ID_MASK;
328 * is_media_entity_v4l2_io() - identify if the entity main function
331 * @entity: pointer to entity
333 * Return: true if the entity main function is one of the V4L2 I/O types
334 * (video, VBI or SDR radio); false otherwise.
336 static inline bool is_media_entity_v4l2_io(struct media_entity *entity)
341 switch (entity->function) {
342 case MEDIA_ENT_F_IO_V4L:
343 case MEDIA_ENT_F_IO_VBI:
344 case MEDIA_ENT_F_IO_SWRADIO:
352 * is_media_entity_v4l2_subdev - return true if the entity main function is
353 * associated with the V4L2 API subdev usage
355 * @entity: pointer to entity
357 * This is an ancillary function used by subdev-based V4L2 drivers.
358 * It checks if the entity function is one of functions used by a V4L2 subdev,
359 * e. g. camera-relatef functions, analog TV decoder, TV tuner, V4L2 DSPs.
361 static inline bool is_media_entity_v4l2_subdev(struct media_entity *entity)
366 switch (entity->function) {
367 case MEDIA_ENT_F_V4L2_SUBDEV_UNKNOWN:
368 case MEDIA_ENT_F_CAM_SENSOR:
369 case MEDIA_ENT_F_FLASH:
370 case MEDIA_ENT_F_LENS:
371 case MEDIA_ENT_F_ATV_DECODER:
372 case MEDIA_ENT_F_TUNER:
380 __must_check int __media_entity_enum_init(struct media_entity_enum *ent_enum,
382 void media_entity_enum_cleanup(struct media_entity_enum *e);
385 * media_entity_enum_zero - Clear the entire enum
387 * @e: Entity enumeration to be cleared
389 static inline void media_entity_enum_zero(struct media_entity_enum *ent_enum)
391 bitmap_zero(ent_enum->bmap, ent_enum->idx_max);
395 * media_entity_enum_set - Mark a single entity in the enum
397 * @e: Entity enumeration
398 * @entity: Entity to be marked
400 static inline void media_entity_enum_set(struct media_entity_enum *ent_enum,
401 struct media_entity *entity)
403 if (WARN_ON(entity->internal_idx >= ent_enum->idx_max))
406 __set_bit(entity->internal_idx, ent_enum->bmap);
410 * media_entity_enum_clear - Unmark a single entity in the enum
412 * @e: Entity enumeration
413 * @entity: Entity to be unmarked
415 static inline void media_entity_enum_clear(struct media_entity_enum *ent_enum,
416 struct media_entity *entity)
418 if (WARN_ON(entity->internal_idx >= ent_enum->idx_max))
421 __clear_bit(entity->internal_idx, ent_enum->bmap);
425 * media_entity_enum_test - Test whether the entity is marked
427 * @e: Entity enumeration
428 * @entity: Entity to be tested
430 * Returns true if the entity was marked.
432 static inline bool media_entity_enum_test(struct media_entity_enum *ent_enum,
433 struct media_entity *entity)
435 if (WARN_ON(entity->internal_idx >= ent_enum->idx_max))
438 return test_bit(entity->internal_idx, ent_enum->bmap);
442 * media_entity_enum_test - Test whether the entity is marked, and mark it
444 * @e: Entity enumeration
445 * @entity: Entity to be tested
447 * Returns true if the entity was marked, and mark it before doing so.
449 static inline bool media_entity_enum_test_and_set(
450 struct media_entity_enum *ent_enum, struct media_entity *entity)
452 if (WARN_ON(entity->internal_idx >= ent_enum->idx_max))
455 return __test_and_set_bit(entity->internal_idx, ent_enum->bmap);
459 * media_entity_enum_test - Test whether the entire enum is empty
461 * @e: Entity enumeration
462 * @entity: Entity to be tested
464 * Returns true if the entity was marked.
466 static inline bool media_entity_enum_empty(struct media_entity_enum *ent_enum)
468 return bitmap_empty(ent_enum->bmap, ent_enum->idx_max);
472 * media_entity_enum_intersects - Test whether two enums intersect
474 * @e: First entity enumeration
475 * @f: Second entity enumeration
477 * Returns true if entity enumerations e and f intersect, otherwise false.
479 static inline bool media_entity_enum_intersects(
480 struct media_entity_enum *ent_enum1,
481 struct media_entity_enum *ent_enum2)
483 WARN_ON(ent_enum1->idx_max != ent_enum2->idx_max);
485 return bitmap_intersects(ent_enum1->bmap, ent_enum2->bmap,
486 min(ent_enum1->idx_max, ent_enum2->idx_max));
489 #define gobj_to_entity(gobj) \
490 container_of(gobj, struct media_entity, graph_obj)
492 #define gobj_to_pad(gobj) \
493 container_of(gobj, struct media_pad, graph_obj)
495 #define gobj_to_link(gobj) \
496 container_of(gobj, struct media_link, graph_obj)
498 #define gobj_to_link(gobj) \
499 container_of(gobj, struct media_link, graph_obj)
501 #define gobj_to_pad(gobj) \
502 container_of(gobj, struct media_pad, graph_obj)
504 #define gobj_to_intf(gobj) \
505 container_of(gobj, struct media_interface, graph_obj)
507 #define intf_to_devnode(intf) \
508 container_of(intf, struct media_intf_devnode, intf)
511 * media_gobj_create - Initialize a graph object
513 * @mdev: Pointer to the media_device that contains the object
514 * @type: Type of the object
515 * @gobj: Pointer to the graph object
517 * This routine initializes the embedded struct media_gobj inside a
518 * media graph object. It is called automatically if media_*_create()
519 * calls are used. However, if the object (entity, link, pad, interface)
520 * is embedded on some other object, this function should be called before
521 * registering the object at the media controller.
523 void media_gobj_create(struct media_device *mdev,
524 enum media_gobj_type type,
525 struct media_gobj *gobj);
528 * media_gobj_destroy - Stop using a graph object on a media device
530 * @gobj: Pointer to the graph object
532 * This should be called by all routines like media_device_unregister()
533 * that remove/destroy media graph objects.
535 void media_gobj_destroy(struct media_gobj *gobj);
538 * media_entity_pads_init() - Initialize the entity pads
540 * @entity: entity where the pads belong
541 * @num_pads: total number of sink and source pads
542 * @pads: Array of @num_pads pads.
544 * The pads array is managed by the entity driver and passed to
545 * media_entity_pads_init() where its pointer will be stored in the entity
548 * If no pads are needed, drivers could either directly fill
549 * &media_entity->@num_pads with 0 and &media_entity->@pads with NULL or call
550 * this function that will do the same.
552 * As the number of pads is known in advance, the pads array is not allocated
553 * dynamically but is managed by the entity driver. Most drivers will embed the
554 * pads array in a driver-specific structure, avoiding dynamic allocation.
556 * Drivers must set the direction of every pad in the pads array before calling
557 * media_entity_pads_init(). The function will initialize the other pads fields.
559 int media_entity_pads_init(struct media_entity *entity, u16 num_pads,
560 struct media_pad *pads);
563 * media_entity_cleanup() - free resources associated with an entity
565 * @entity: entity where the pads belong
567 * This function must be called during the cleanup phase after unregistering
568 * the entity (currently, it does nothing).
570 static inline void media_entity_cleanup(struct media_entity *entity) {};
573 * media_create_pad_link() - creates a link between two entities.
575 * @source: pointer to &media_entity of the source pad.
576 * @source_pad: number of the source pad in the pads array
577 * @sink: pointer to &media_entity of the sink pad.
578 * @sink_pad: number of the sink pad in the pads array.
579 * @flags: Link flags, as defined in include/uapi/linux/media.h.
581 * Valid values for flags:
582 * A %MEDIA_LNK_FL_ENABLED flag indicates that the link is enabled and can be
583 * used to transfer media data. When two or more links target a sink pad,
584 * only one of them can be enabled at a time.
586 * A %MEDIA_LNK_FL_IMMUTABLE flag indicates that the link enabled state can't
587 * be modified at runtime. If %MEDIA_LNK_FL_IMMUTABLE is set, then
588 * %MEDIA_LNK_FL_ENABLED must also be set since an immutable link is
593 * Before calling this function, media_entity_pads_init() and
594 * media_device_register_entity() should be called previously for both ends.
596 __must_check int media_create_pad_link(struct media_entity *source,
597 u16 source_pad, struct media_entity *sink,
598 u16 sink_pad, u32 flags);
599 void __media_entity_remove_links(struct media_entity *entity);
602 * media_entity_remove_links() - remove all links associated with an entity
604 * @entity: pointer to &media_entity
606 * Note: this is called automatically when an entity is unregistered via
607 * media_device_register_entity().
609 void media_entity_remove_links(struct media_entity *entity);
612 * __media_entity_setup_link - Configure a media link without locking
613 * @link: The link being configured
614 * @flags: Link configuration flags
616 * The bulk of link setup is handled by the two entities connected through the
617 * link. This function notifies both entities of the link configuration change.
619 * If the link is immutable or if the current and new configuration are
620 * identical, return immediately.
622 * The user is expected to hold link->source->parent->mutex. If not,
623 * media_entity_setup_link() should be used instead.
625 int __media_entity_setup_link(struct media_link *link, u32 flags);
628 * media_entity_setup_link() - changes the link flags properties in runtime
630 * @link: pointer to &media_link
631 * @flags: the requested new link flags
633 * The only configurable property is the %MEDIA_LNK_FL_ENABLED link flag
634 * flag to enable/disable a link. Links marked with the
635 * %MEDIA_LNK_FL_IMMUTABLE link flag can not be enabled or disabled.
637 * When a link is enabled or disabled, the media framework calls the
638 * link_setup operation for the two entities at the source and sink of the
639 * link, in that order. If the second link_setup call fails, another
640 * link_setup call is made on the first entity to restore the original link
643 * Media device drivers can be notified of link setup operations by setting the
644 * media_device::link_notify pointer to a callback function. If provided, the
645 * notification callback will be called before enabling and after disabling
648 * Entity drivers must implement the link_setup operation if any of their links
649 * is non-immutable. The operation must either configure the hardware or store
650 * the configuration information to be applied later.
652 * Link configuration must not have any side effect on other links. If an
653 * enabled link at a sink pad prevents another link at the same pad from
654 * being enabled, the link_setup operation must return -EBUSY and can't
655 * implicitly disable the first enabled link.
657 * NOTE: the valid values of the flags for the link is the same as described
658 * on media_create_pad_link(), for pad to pad links or the same as described
659 * on media_create_intf_link(), for interface to entity links.
661 int media_entity_setup_link(struct media_link *link, u32 flags);
664 * media_entity_find_link - Find a link between two pads
665 * @source: Source pad
668 * Return a pointer to the link between the two entities. If no such link
669 * exists, return NULL.
671 struct media_link *media_entity_find_link(struct media_pad *source,
672 struct media_pad *sink);
675 * media_entity_remote_pad - Find the pad at the remote end of a link
676 * @pad: Pad at the local end of the link
678 * Search for a remote pad connected to the given pad by iterating over all
679 * links originating or terminating at that pad until an enabled link is found.
681 * Return a pointer to the pad at the remote end of the first found enabled
682 * link, or NULL if no enabled link has been found.
684 struct media_pad *media_entity_remote_pad(struct media_pad *pad);
687 * media_entity_get - Get a reference to the parent module
689 * @entity: The entity
691 * Get a reference to the parent media device module.
693 * The function will return immediately if @entity is NULL.
695 * Return a pointer to the entity on success or NULL on failure.
697 struct media_entity *media_entity_get(struct media_entity *entity);
699 __must_check int media_entity_graph_walk_init(
700 struct media_entity_graph *graph, struct media_device *mdev);
701 void media_entity_graph_walk_cleanup(struct media_entity_graph *graph);
704 * media_entity_put - Release the reference to the parent module
706 * @entity: The entity
708 * Release the reference count acquired by media_entity_get().
710 * The function will return immediately if @entity is NULL.
712 void media_entity_put(struct media_entity *entity);
715 * media_entity_graph_walk_start - Start walking the media graph at a given entity
716 * @graph: Media graph structure that will be used to walk the graph
717 * @entity: Starting entity
719 * Before using this function, media_entity_graph_walk_init() must be
720 * used to allocate resources used for walking the graph. This
721 * function initializes the graph traversal structure to walk the
722 * entities graph starting at the given entity. The traversal
723 * structure must not be modified by the caller during graph
724 * traversal. After the graph walk, the resources must be released
725 * using media_entity_graph_walk_cleanup().
727 void media_entity_graph_walk_start(struct media_entity_graph *graph,
728 struct media_entity *entity);
731 * media_entity_graph_walk_next - Get the next entity in the graph
732 * @graph: Media graph structure
734 * Perform a depth-first traversal of the given media entities graph.
736 * The graph structure must have been previously initialized with a call to
737 * media_entity_graph_walk_start().
739 * Return the next entity in the graph or NULL if the whole graph have been
742 struct media_entity *
743 media_entity_graph_walk_next(struct media_entity_graph *graph);
746 * media_entity_pipeline_start - Mark a pipeline as streaming
747 * @entity: Starting entity
748 * @pipe: Media pipeline to be assigned to all entities in the pipeline.
750 * Mark all entities connected to a given entity through enabled links, either
751 * directly or indirectly, as streaming. The given pipeline object is assigned to
752 * every entity in the pipeline and stored in the media_entity pipe field.
754 * Calls to this function can be nested, in which case the same number of
755 * media_entity_pipeline_stop() calls will be required to stop streaming. The
756 * pipeline pointer must be identical for all nested calls to
757 * media_entity_pipeline_start().
759 __must_check int media_entity_pipeline_start(struct media_entity *entity,
760 struct media_pipeline *pipe);
763 * media_entity_pipeline_stop - Mark a pipeline as not streaming
764 * @entity: Starting entity
766 * Mark all entities connected to a given entity through enabled links, either
767 * directly or indirectly, as not streaming. The media_entity pipe field is
770 * If multiple calls to media_entity_pipeline_start() have been made, the same
771 * number of calls to this function are required to mark the pipeline as not
774 void media_entity_pipeline_stop(struct media_entity *entity);
777 * media_devnode_create() - creates and initializes a device node interface
779 * @mdev: pointer to struct &media_device
780 * @type: type of the interface, as given by MEDIA_INTF_T_* macros
781 * as defined in the uapi/media/media.h header.
782 * @flags: Interface flags as defined in uapi/media/media.h.
783 * @major: Device node major number.
784 * @minor: Device node minor number.
786 * Return: if succeeded, returns a pointer to the newly allocated
787 * &media_intf_devnode pointer.
789 struct media_intf_devnode *
790 __must_check media_devnode_create(struct media_device *mdev,
792 u32 major, u32 minor);
794 * media_devnode_remove() - removes a device node interface
796 * @devnode: pointer to &media_intf_devnode to be freed.
798 * When a device node interface is removed, all links to it are automatically
801 void media_devnode_remove(struct media_intf_devnode *devnode);
805 * media_create_intf_link() - creates a link between an entity and an interface
807 * @entity: pointer to %media_entity
808 * @intf: pointer to %media_interface
809 * @flags: Link flags, as defined in include/uapi/linux/media.h.
812 * Valid values for flags:
813 * The %MEDIA_LNK_FL_ENABLED flag indicates that the interface is connected to
814 * the entity hardware. That's the default value for interfaces. An
815 * interface may be disabled if the hardware is busy due to the usage
816 * of some other interface that it is currently controlling the hardware.
817 * A typical example is an hybrid TV device that handle only one type of
818 * stream on a given time. So, when the digital TV is streaming,
819 * the V4L2 interfaces won't be enabled, as such device is not able to
820 * also stream analog TV or radio.
824 * Before calling this function, media_devnode_create() should be called for
825 * the interface and media_device_register_entity() should be called for the
826 * interface that will be part of the link.
828 __must_check media_create_intf_link(struct media_entity *entity,
829 struct media_interface *intf,
832 * __media_remove_intf_link() - remove a single interface link
834 * @link: pointer to &media_link.
836 * Note: this is an unlocked version of media_remove_intf_link()
838 void __media_remove_intf_link(struct media_link *link);
841 * media_remove_intf_link() - remove a single interface link
843 * @link: pointer to &media_link.
845 * Note: prefer to use this one, instead of __media_remove_intf_link()
847 void media_remove_intf_link(struct media_link *link);
850 * __media_remove_intf_links() - remove all links associated with an interface
852 * @intf: pointer to &media_interface
854 * Note: this is an unlocked version of media_remove_intf_links().
856 void __media_remove_intf_links(struct media_interface *intf);
858 * media_remove_intf_links() - remove all links associated with an interface
860 * @intf: pointer to &media_interface
864 * this is called automatically when an entity is unregistered via
865 * media_device_register_entity() and by media_devnode_remove().
867 * Prefer to use this one, instead of __media_remove_intf_links().
869 void media_remove_intf_links(struct media_interface *intf);
872 #define media_entity_call(entity, operation, args...) \
873 (((entity)->ops && (entity)->ops->operation) ? \
874 (entity)->ops->operation((entity) , ##args) : -ENOIOCTLCMD)