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/bitops.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 struct media_pipeline {
78 * struct media_link - A link object part of a media graph.
80 * @graph_obj: Embedded structure containing the media object common data
81 * @list: Linked list associated with an entity or an interface that
83 * @gobj0: Part of a union. Used to get the pointer for the first
84 * graph_object of the link.
85 * @source: Part of a union. Used only if the first object (gobj0) is
86 * a pad. In that case, it represents the source pad.
87 * @intf: Part of a union. Used only if the first object (gobj0) is
89 * @gobj1: Part of a union. Used to get the pointer for the second
90 * graph_object of the link.
91 * @source: Part of a union. Used only if the second object (gobj1) is
92 * a pad. In that case, it represents the sink pad.
93 * @entity: Part of a union. Used only if the second object (gobj1) is
95 * @reverse: Pointer to the link for the reverse direction of a pad to pad
97 * @flags: Link flags, as defined in uapi/media.h (MEDIA_LNK_FL_*)
98 * @is_backlink: Indicate if the link is a backlink.
101 struct media_gobj graph_obj;
102 struct list_head list;
104 struct media_gobj *gobj0;
105 struct media_pad *source;
106 struct media_interface *intf;
109 struct media_gobj *gobj1;
110 struct media_pad *sink;
111 struct media_entity *entity;
113 struct media_link *reverse;
119 * struct media_pad - A media pad graph object.
121 * @graph_obj: Embedded structure containing the media object common data
122 * @entity: Entity this pad belongs to
123 * @index: Pad index in the entity pads array, numbered from 0 to n
124 * @flags: Pad flags, as defined in uapi/media.h (MEDIA_PAD_FL_*)
127 struct media_gobj graph_obj; /* must be first field in struct */
128 struct media_entity *entity;
134 * struct media_entity_operations - Media entity operations
135 * @link_setup: Notify the entity of link changes. The operation can
136 * return an error, in which case link setup will be
137 * cancelled. Optional.
138 * @link_validate: Return whether a link is valid from the entity point of
139 * view. The media_entity_pipeline_start() function
140 * validates all links by calling this operation. Optional.
142 struct media_entity_operations {
143 int (*link_setup)(struct media_entity *entity,
144 const struct media_pad *local,
145 const struct media_pad *remote, u32 flags);
146 int (*link_validate)(struct media_link *link);
150 * struct media_entity - A media entity graph object.
152 * @graph_obj: Embedded structure containing the media object common data.
153 * @name: Entity name.
154 * @function: Entity main function, as defined in uapi/media.h
156 * @revision: Entity revision - OBSOLETE - should be removed soon.
157 * @flags: Entity flags, as defined in uapi/media.h (MEDIA_ENT_FL_*)
158 * @group_id: Entity group ID - OBSOLETE - should be removed soon.
159 * @num_pads: Number of sink and source pads.
160 * @num_links: Total number of links, forward and back, enabled and disabled.
161 * @num_backlinks: Number of backlinks
162 * @pads: Pads array with the size defined by @num_pads.
163 * @links: List of data links.
164 * @ops: Entity operations.
165 * @stream_count: Stream count for the entity.
166 * @use_count: Use count for the entity.
167 * @pipe: Pipeline this entity belongs to.
168 * @info: Union with devnode information. Kept just for backward
170 * @major: Devnode major number (zero if not applicable). Kept just
171 * for backward compatibility.
172 * @minor: Devnode minor number (zero if not applicable). Kept just
173 * for backward compatibility.
175 * NOTE: @stream_count and @use_count reference counts must never be
176 * negative, but are signed integers on purpose: a simple WARN_ON(<0) check
177 * can be used to detect reference count bugs that would make them negative.
179 struct media_entity {
180 struct media_gobj graph_obj; /* must be first field in struct */
191 struct media_pad *pads;
192 struct list_head links;
194 const struct media_entity_operations *ops;
196 /* Reference counts must never be negative, but are signed integers on
197 * purpose: a simple WARN_ON(<0) check can be used to detect reference
198 * count bugs that would make them negative.
203 struct media_pipeline *pipe;
214 * struct media_interface - A media interface graph object.
216 * @graph_obj: embedded graph object
217 * @links: List of links pointing to graph entities
218 * @type: Type of the interface as defined in the
219 * uapi/media/media.h header, e. g.
221 * @flags: Interface flags as defined in uapi/media/media.h
223 struct media_interface {
224 struct media_gobj graph_obj;
225 struct list_head links;
231 * struct media_intf_devnode - A media interface via a device node.
233 * @intf: embedded interface object
234 * @major: Major number of a device node
235 * @minor: Minor number of a device node
237 struct media_intf_devnode {
238 struct media_interface intf;
240 /* Should match the fields at media_v2_intf_devnode */
245 static inline u32 media_entity_id(struct media_entity *entity)
247 return entity->graph_obj.id;
250 static inline enum media_gobj_type media_type(struct media_gobj *gobj)
252 return gobj->id >> MEDIA_BITS_PER_LOCAL_ID;
255 static inline u32 media_localid(struct media_gobj *gobj)
257 return gobj->id & MEDIA_LOCAL_ID_MASK;
260 static inline u32 media_gobj_gen_id(enum media_gobj_type type, u32 local_id)
264 id = type << MEDIA_BITS_PER_LOCAL_ID;
265 id |= local_id & MEDIA_LOCAL_ID_MASK;
270 static inline bool is_media_entity_v4l2_io(struct media_entity *entity)
275 switch (entity->function) {
276 case MEDIA_ENT_F_IO_V4L:
277 case MEDIA_ENT_F_IO_VBI:
278 case MEDIA_ENT_F_IO_SWRADIO:
285 static inline bool is_media_entity_v4l2_subdev(struct media_entity *entity)
290 switch (entity->function) {
291 case MEDIA_ENT_F_V4L2_SUBDEV_UNKNOWN:
292 case MEDIA_ENT_F_CAM_SENSOR:
293 case MEDIA_ENT_F_FLASH:
294 case MEDIA_ENT_F_LENS:
295 case MEDIA_ENT_F_ATV_DECODER:
296 case MEDIA_ENT_F_TUNER:
304 #define MEDIA_ENTITY_ENUM_MAX_DEPTH 16
305 #define MEDIA_ENTITY_ENUM_MAX_ID 64
308 * The number of pads can't be bigger than the number of entities,
309 * as the worse-case scenario is to have one entity linked up to
310 * MEDIA_ENTITY_ENUM_MAX_ID - 1 entities.
312 #define MEDIA_ENTITY_MAX_PADS (MEDIA_ENTITY_ENUM_MAX_ID - 1)
314 struct media_entity_graph {
316 struct media_entity *entity;
317 struct list_head *link;
318 } stack[MEDIA_ENTITY_ENUM_MAX_DEPTH];
320 DECLARE_BITMAP(entities, MEDIA_ENTITY_ENUM_MAX_ID);
324 #define gobj_to_entity(gobj) \
325 container_of(gobj, struct media_entity, graph_obj)
327 #define gobj_to_pad(gobj) \
328 container_of(gobj, struct media_pad, graph_obj)
330 #define gobj_to_link(gobj) \
331 container_of(gobj, struct media_link, graph_obj)
333 #define gobj_to_link(gobj) \
334 container_of(gobj, struct media_link, graph_obj)
336 #define gobj_to_pad(gobj) \
337 container_of(gobj, struct media_pad, graph_obj)
339 #define gobj_to_intf(gobj) \
340 container_of(gobj, struct media_interface, graph_obj)
342 #define intf_to_devnode(intf) \
343 container_of(intf, struct media_intf_devnode, intf)
345 void media_gobj_init(struct media_device *mdev,
346 enum media_gobj_type type,
347 struct media_gobj *gobj);
348 void media_gobj_remove(struct media_gobj *gobj);
350 int media_entity_init(struct media_entity *entity, u16 num_pads,
351 struct media_pad *pads);
352 void media_entity_cleanup(struct media_entity *entity);
354 __must_check int media_create_pad_link(struct media_entity *source,
355 u16 source_pad, struct media_entity *sink,
356 u16 sink_pad, u32 flags);
357 void __media_entity_remove_links(struct media_entity *entity);
358 void media_entity_remove_links(struct media_entity *entity);
360 int __media_entity_setup_link(struct media_link *link, u32 flags);
361 int media_entity_setup_link(struct media_link *link, u32 flags);
362 struct media_link *media_entity_find_link(struct media_pad *source,
363 struct media_pad *sink);
364 struct media_pad *media_entity_remote_pad(struct media_pad *pad);
366 struct media_entity *media_entity_get(struct media_entity *entity);
367 void media_entity_put(struct media_entity *entity);
369 void media_entity_graph_walk_start(struct media_entity_graph *graph,
370 struct media_entity *entity);
371 struct media_entity *
372 media_entity_graph_walk_next(struct media_entity_graph *graph);
373 __must_check int media_entity_pipeline_start(struct media_entity *entity,
374 struct media_pipeline *pipe);
375 void media_entity_pipeline_stop(struct media_entity *entity);
377 struct media_intf_devnode *
378 __must_check media_devnode_create(struct media_device *mdev,
380 u32 major, u32 minor);
381 void media_devnode_remove(struct media_intf_devnode *devnode);
383 __must_check media_create_intf_link(struct media_entity *entity,
384 struct media_interface *intf,
386 void __media_remove_intf_link(struct media_link *link);
387 void media_remove_intf_link(struct media_link *link);
388 void __media_remove_intf_links(struct media_interface *intf);
389 void media_remove_intf_links(struct media_interface *intf);
392 #define media_entity_call(entity, operation, args...) \
393 (((entity)->ops && (entity)->ops->operation) ? \
394 (entity)->ops->operation((entity) , ##args) : -ENOIOCTLCMD)