Commit | Line | Data |
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1802d0be | 1 | /* SPDX-License-Identifier: GPL-2.0-only */ |
53e269c1 LP |
2 | /* |
3 | * Media entity | |
4 | * | |
5 | * Copyright (C) 2010 Nokia Corporation | |
6 | * | |
7 | * Contacts: Laurent Pinchart <laurent.pinchart@ideasonboard.com> | |
8 | * Sakari Ailus <sakari.ailus@iki.fi> | |
53e269c1 LP |
9 | */ |
10 | ||
11 | #ifndef _MEDIA_ENTITY_H | |
12 | #define _MEDIA_ENTITY_H | |
13 | ||
c8d54cd5 | 14 | #include <linux/bitmap.h> |
2899d35d | 15 | #include <linux/bug.h> |
28b2e8f3 | 16 | #include <linux/container_of.h> |
ae45cd5e | 17 | #include <linux/fwnode.h> |
53e269c1 | 18 | #include <linux/list.h> |
1651333b | 19 | #include <linux/media.h> |
c7097c80 | 20 | #include <linux/minmax.h> |
28b2e8f3 | 21 | #include <linux/types.h> |
53e269c1 | 22 | |
ec6e4c95 MCC |
23 | /* Enums used internally at the media controller to represent graphs */ |
24 | ||
25 | /** | |
26 | * enum media_gobj_type - type of a graph object | |
27 | * | |
bfab2aac | 28 | * @MEDIA_GRAPH_ENTITY: Identify a media entity |
18710dc6 | 29 | * @MEDIA_GRAPH_PAD: Identify a media pad |
6b6a4278 | 30 | * @MEDIA_GRAPH_LINK: Identify a media link |
27e543fa MCC |
31 | * @MEDIA_GRAPH_INTF_DEVNODE: Identify a media Kernel API interface via |
32 | * a device node | |
ec6e4c95 MCC |
33 | */ |
34 | enum media_gobj_type { | |
bfab2aac | 35 | MEDIA_GRAPH_ENTITY, |
18710dc6 | 36 | MEDIA_GRAPH_PAD, |
6b6a4278 | 37 | MEDIA_GRAPH_LINK, |
27e543fa | 38 | MEDIA_GRAPH_INTF_DEVNODE, |
ec6e4c95 MCC |
39 | }; |
40 | ||
41 | #define MEDIA_BITS_PER_TYPE 8 | |
05b3b77c MCC |
42 | #define MEDIA_BITS_PER_ID (32 - MEDIA_BITS_PER_TYPE) |
43 | #define MEDIA_ID_MASK GENMASK_ULL(MEDIA_BITS_PER_ID - 1, 0) | |
ec6e4c95 MCC |
44 | |
45 | /* Structs to represent the objects that belong to a media graph */ | |
46 | ||
47 | /** | |
48 | * struct media_gobj - Define a graph object. | |
49 | * | |
48a7c4ba | 50 | * @mdev: Pointer to the struct &media_device that owns the object |
ec6e4c95 MCC |
51 | * @id: Non-zero object ID identifier. The ID should be unique |
52 | * inside a media_device, as it is composed by | |
05b3b77c MCC |
53 | * %MEDIA_BITS_PER_TYPE to store the type plus |
54 | * %MEDIA_BITS_PER_ID to store the ID | |
c358e80d | 55 | * @list: List entry stored in one of the per-type mdev object lists |
ec6e4c95 MCC |
56 | * |
57 | * All objects on the media graph should have this struct embedded | |
58 | */ | |
59 | struct media_gobj { | |
39a956c4 | 60 | struct media_device *mdev; |
ec6e4c95 | 61 | u32 id; |
05bfa9fa | 62 | struct list_head list; |
ec6e4c95 MCC |
63 | }; |
64 | ||
c8d54cd5 | 65 | #define MEDIA_ENTITY_ENUM_MAX_DEPTH 16 |
c8d54cd5 | 66 | |
c8d54cd5 SA |
67 | /** |
68 | * struct media_entity_enum - An enumeration of media entities. | |
69 | * | |
c8d54cd5 SA |
70 | * @bmap: Bit map in which each bit represents one entity at struct |
71 | * media_entity->internal_idx. | |
72 | * @idx_max: Number of bits in bmap | |
73 | */ | |
74 | struct media_entity_enum { | |
c8d54cd5 SA |
75 | unsigned long *bmap; |
76 | int idx_max; | |
77 | }; | |
78 | ||
434257f1 | 79 | /** |
20b85227 | 80 | * struct media_graph - Media graph traversal state |
434257f1 SA |
81 | * |
82 | * @stack: Graph traversal stack; the stack contains information | |
83 | * on the path the media entities to be walked and the | |
84 | * links through which they were reached. | |
bd945e47 MCC |
85 | * @stack.entity: pointer to &struct media_entity at the graph. |
86 | * @stack.link: pointer to &struct list_head. | |
29d8da02 | 87 | * @ent_enum: Visited entities |
434257f1 SA |
88 | * @top: The top of the stack |
89 | */ | |
20b85227 | 90 | struct media_graph { |
82c68290 SA |
91 | struct { |
92 | struct media_entity *entity; | |
93 | struct list_head *link; | |
94 | } stack[MEDIA_ENTITY_ENUM_MAX_DEPTH]; | |
95 | ||
29d8da02 | 96 | struct media_entity_enum ent_enum; |
82c68290 SA |
97 | int top; |
98 | }; | |
99 | ||
74604b73 | 100 | /** |
5dd8775d SA |
101 | * struct media_pipeline - Media pipeline related information |
102 | * | |
b7319e2b | 103 | * @start_count: Media pipeline start - stop count |
74a41330 | 104 | * @graph: Media graph walk during pipeline start / stop |
5dd8775d | 105 | */ |
e02188c9 | 106 | struct media_pipeline { |
b7319e2b | 107 | int start_count; |
20b85227 | 108 | struct media_graph graph; |
e02188c9 LP |
109 | }; |
110 | ||
c358e80d MCC |
111 | /** |
112 | * struct media_link - A link object part of a media graph. | |
113 | * | |
114 | * @graph_obj: Embedded structure containing the media object common data | |
115 | * @list: Linked list associated with an entity or an interface that | |
116 | * owns the link. | |
117 | * @gobj0: Part of a union. Used to get the pointer for the first | |
118 | * graph_object of the link. | |
119 | * @source: Part of a union. Used only if the first object (gobj0) is | |
120 | * a pad. In that case, it represents the source pad. | |
121 | * @intf: Part of a union. Used only if the first object (gobj0) is | |
122 | * an interface. | |
123 | * @gobj1: Part of a union. Used to get the pointer for the second | |
124 | * graph_object of the link. | |
e383ce07 | 125 | * @sink: Part of a union. Used only if the second object (gobj1) is |
c358e80d MCC |
126 | * a pad. In that case, it represents the sink pad. |
127 | * @entity: Part of a union. Used only if the second object (gobj1) is | |
128 | * an entity. | |
129 | * @reverse: Pointer to the link for the reverse direction of a pad to pad | |
130 | * link. | |
131 | * @flags: Link flags, as defined in uapi/media.h (MEDIA_LNK_FL_*) | |
39d1ebc6 | 132 | * @is_backlink: Indicate if the link is a backlink. |
c358e80d | 133 | */ |
53e269c1 | 134 | struct media_link { |
6b6a4278 | 135 | struct media_gobj graph_obj; |
57208e5e | 136 | struct list_head list; |
4b8a3c08 MCC |
137 | union { |
138 | struct media_gobj *gobj0; | |
139 | struct media_pad *source; | |
86e26620 | 140 | struct media_interface *intf; |
4b8a3c08 MCC |
141 | }; |
142 | union { | |
143 | struct media_gobj *gobj1; | |
144 | struct media_pad *sink; | |
86e26620 | 145 | struct media_entity *entity; |
4b8a3c08 | 146 | }; |
c358e80d MCC |
147 | struct media_link *reverse; |
148 | unsigned long flags; | |
39d1ebc6 | 149 | bool is_backlink; |
53e269c1 LP |
150 | }; |
151 | ||
c1a37dd5 MCC |
152 | /** |
153 | * enum media_pad_signal_type - type of the signal inside a media pad | |
154 | * | |
155 | * @PAD_SIGNAL_DEFAULT: | |
156 | * Default signal. Use this when all inputs or all outputs are | |
157 | * uniquely identified by the pad number. | |
158 | * @PAD_SIGNAL_ANALOG: | |
159 | * The pad contains an analog signal. It can be Radio Frequency, | |
45cdd2a0 | 160 | * Intermediate Frequency, a baseband signal or sub-carriers. |
c1a37dd5 MCC |
161 | * Tuner inputs, IF-PLL demodulators, composite and s-video signals |
162 | * should use it. | |
163 | * @PAD_SIGNAL_DV: | |
164 | * Contains a digital video signal, with can be a bitstream of samples | |
165 | * taken from an analog TV video source. On such case, it usually | |
166 | * contains the VBI data on it. | |
167 | * @PAD_SIGNAL_AUDIO: | |
168 | * Contains an Intermediate Frequency analog signal from an audio | |
169 | * sub-carrier or an audio bitstream. IF signals are provided by tuners | |
170 | * and consumed by audio AM/FM decoders. Bitstream audio is provided by | |
171 | * an audio decoder. | |
172 | */ | |
173 | enum media_pad_signal_type { | |
174 | PAD_SIGNAL_DEFAULT = 0, | |
175 | PAD_SIGNAL_ANALOG, | |
176 | PAD_SIGNAL_DV, | |
177 | PAD_SIGNAL_AUDIO, | |
178 | }; | |
179 | ||
c358e80d MCC |
180 | /** |
181 | * struct media_pad - A media pad graph object. | |
182 | * | |
183 | * @graph_obj: Embedded structure containing the media object common data | |
184 | * @entity: Entity this pad belongs to | |
185 | * @index: Pad index in the entity pads array, numbered from 0 to n | |
c1a37dd5 | 186 | * @sig_type: Type of the signal inside a media pad |
48a7c4ba MCC |
187 | * @flags: Pad flags, as defined in |
188 | * :ref:`include/uapi/linux/media.h <media_header>` | |
189 | * (seek for ``MEDIA_PAD_FL_*``) | |
c358e80d | 190 | */ |
53e269c1 | 191 | struct media_pad { |
4b8a3c08 | 192 | struct media_gobj graph_obj; /* must be first field in struct */ |
c358e80d MCC |
193 | struct media_entity *entity; |
194 | u16 index; | |
c1a37dd5 | 195 | enum media_pad_signal_type sig_type; |
c358e80d | 196 | unsigned long flags; |
53e269c1 LP |
197 | }; |
198 | ||
5a5394be LP |
199 | /** |
200 | * struct media_entity_operations - Media entity operations | |
ae45cd5e NS |
201 | * @get_fwnode_pad: Return the pad number based on a fwnode endpoint or |
202 | * a negative value on error. This operation can be used | |
203 | * to map a fwnode to a media pad number. Optional. | |
5a5394be LP |
204 | * @link_setup: Notify the entity of link changes. The operation can |
205 | * return an error, in which case link setup will be | |
206 | * cancelled. Optional. | |
207 | * @link_validate: Return whether a link is valid from the entity point of | |
20b85227 | 208 | * view. The media_pipeline_start() function |
5a5394be | 209 | * validates all links by calling this operation. Optional. |
5ed470fe | 210 | * |
5b8700e9 MCC |
211 | * .. note:: |
212 | * | |
48a7c4ba | 213 | * Those these callbacks are called with struct &media_device.graph_mutex |
5b8700e9 | 214 | * mutex held. |
5a5394be | 215 | */ |
97548ed4 | 216 | struct media_entity_operations { |
70d4a9ef SL |
217 | int (*get_fwnode_pad)(struct media_entity *entity, |
218 | struct fwnode_endpoint *endpoint); | |
97548ed4 LP |
219 | int (*link_setup)(struct media_entity *entity, |
220 | const struct media_pad *local, | |
221 | const struct media_pad *remote, u32 flags); | |
af88be38 | 222 | int (*link_validate)(struct media_link *link); |
97548ed4 LP |
223 | }; |
224 | ||
b76a2a8c LP |
225 | /** |
226 | * enum media_entity_type - Media entity type | |
227 | * | |
228 | * @MEDIA_ENTITY_TYPE_BASE: | |
229 | * The entity isn't embedded in another subsystem structure. | |
230 | * @MEDIA_ENTITY_TYPE_VIDEO_DEVICE: | |
231 | * The entity is embedded in a struct video_device instance. | |
232 | * @MEDIA_ENTITY_TYPE_V4L2_SUBDEV: | |
233 | * The entity is embedded in a struct v4l2_subdev instance. | |
234 | * | |
235 | * Media entity objects are often not instantiated directly, but the media | |
236 | * entity structure is inherited by (through embedding) other subsystem-specific | |
237 | * structures. The media entity type identifies the type of the subclass | |
238 | * structure that implements a media entity instance. | |
239 | * | |
240 | * This allows runtime type identification of media entities and safe casting to | |
241 | * the correct object type. For instance, a media entity structure instance | |
242 | * embedded in a v4l2_subdev structure instance will have the type | |
48a7c4ba | 243 | * %MEDIA_ENTITY_TYPE_V4L2_SUBDEV and can safely be cast to a &v4l2_subdev |
b76a2a8c LP |
244 | * structure using the container_of() macro. |
245 | */ | |
246 | enum media_entity_type { | |
247 | MEDIA_ENTITY_TYPE_BASE, | |
248 | MEDIA_ENTITY_TYPE_VIDEO_DEVICE, | |
249 | MEDIA_ENTITY_TYPE_V4L2_SUBDEV, | |
250 | }; | |
251 | ||
c358e80d MCC |
252 | /** |
253 | * struct media_entity - A media entity graph object. | |
254 | * | |
255 | * @graph_obj: Embedded structure containing the media object common data. | |
256 | * @name: Entity name. | |
b76a2a8c | 257 | * @obj_type: Type of the object that implements the media_entity. |
48a7c4ba MCC |
258 | * @function: Entity main function, as defined in |
259 | * :ref:`include/uapi/linux/media.h <media_header>` | |
260 | * (seek for ``MEDIA_ENT_F_*``) | |
261 | * @flags: Entity flags, as defined in | |
262 | * :ref:`include/uapi/linux/media.h <media_header>` | |
263 | * (seek for ``MEDIA_ENT_FL_*``) | |
c358e80d MCC |
264 | * @num_pads: Number of sink and source pads. |
265 | * @num_links: Total number of links, forward and back, enabled and disabled. | |
266 | * @num_backlinks: Number of backlinks | |
665faa97 SA |
267 | * @internal_idx: An unique internal entity specific number. The numbers are |
268 | * re-used if entities are unregistered or registered again. | |
c358e80d MCC |
269 | * @pads: Pads array with the size defined by @num_pads. |
270 | * @links: List of data links. | |
271 | * @ops: Entity operations. | |
c358e80d MCC |
272 | * @use_count: Use count for the entity. |
273 | * @pipe: Pipeline this entity belongs to. | |
274 | * @info: Union with devnode information. Kept just for backward | |
275 | * compatibility. | |
bd945e47 MCC |
276 | * @info.dev: Contains device major and minor info. |
277 | * @info.dev.major: device node major, if the device is a devnode. | |
278 | * @info.dev.minor: device node minor, if the device is a devnode. | |
c358e80d MCC |
279 | * @major: Devnode major number (zero if not applicable). Kept just |
280 | * for backward compatibility. | |
281 | * @minor: Devnode minor number (zero if not applicable). Kept just | |
282 | * for backward compatibility. | |
283 | * | |
48a7c4ba MCC |
284 | * .. note:: |
285 | * | |
3056a8e9 LP |
286 | * The @use_count reference count must never be negative, but is a signed |
287 | * integer on purpose: a simple ``WARN_ON(<0)`` check can be used to detect | |
288 | * reference count bugs that would make it negative. | |
c358e80d | 289 | */ |
53e269c1 | 290 | struct media_entity { |
4b8a3c08 | 291 | struct media_gobj graph_obj; /* must be first field in struct */ |
c358e80d | 292 | const char *name; |
b76a2a8c | 293 | enum media_entity_type obj_type; |
0e576b76 | 294 | u32 function; |
c358e80d | 295 | unsigned long flags; |
53e269c1 | 296 | |
c358e80d MCC |
297 | u16 num_pads; |
298 | u16 num_links; | |
299 | u16 num_backlinks; | |
665faa97 | 300 | int internal_idx; |
53e269c1 | 301 | |
c358e80d MCC |
302 | struct media_pad *pads; |
303 | struct list_head links; | |
53e269c1 | 304 | |
c358e80d | 305 | const struct media_entity_operations *ops; |
97548ed4 | 306 | |
c358e80d | 307 | int use_count; |
503c3d82 | 308 | |
c358e80d | 309 | struct media_pipeline *pipe; |
e02188c9 | 310 | |
53e269c1 | 311 | union { |
53e269c1 LP |
312 | struct { |
313 | u32 major; | |
314 | u32 minor; | |
e31a0ba7 | 315 | } dev; |
fa5034c6 | 316 | } info; |
53e269c1 LP |
317 | }; |
318 | ||
8db465f7 JM |
319 | /** |
320 | * media_entity_for_each_pad - Iterate on all pads in an entity | |
321 | * @entity: The entity the pads belong to | |
322 | * @iter: The iterator pad | |
323 | * | |
324 | * Iterate on all pads in a media entity. | |
325 | */ | |
326 | #define media_entity_for_each_pad(entity, iter) \ | |
327 | for (iter = (entity)->pads; \ | |
328 | iter < &(entity)->pads[(entity)->num_pads]; \ | |
329 | ++iter) | |
330 | ||
27e543fa | 331 | /** |
c358e80d | 332 | * struct media_interface - A media interface graph object. |
27e543fa MCC |
333 | * |
334 | * @graph_obj: embedded graph object | |
86e26620 | 335 | * @links: List of links pointing to graph entities |
48a7c4ba MCC |
336 | * @type: Type of the interface as defined in |
337 | * :ref:`include/uapi/linux/media.h <media_header>` | |
338 | * (seek for ``MEDIA_INTF_T_*``) | |
339 | * @flags: Interface flags as defined in | |
340 | * :ref:`include/uapi/linux/media.h <media_header>` | |
341 | * (seek for ``MEDIA_INTF_FL_*``) | |
342 | * | |
343 | * .. note:: | |
344 | * | |
345 | * Currently, no flags for &media_interface is defined. | |
27e543fa MCC |
346 | */ |
347 | struct media_interface { | |
348 | struct media_gobj graph_obj; | |
86e26620 | 349 | struct list_head links; |
27e543fa MCC |
350 | u32 type; |
351 | u32 flags; | |
352 | }; | |
353 | ||
354 | /** | |
c358e80d | 355 | * struct media_intf_devnode - A media interface via a device node. |
27e543fa MCC |
356 | * |
357 | * @intf: embedded interface object | |
358 | * @major: Major number of a device node | |
359 | * @minor: Minor number of a device node | |
360 | */ | |
361 | struct media_intf_devnode { | |
362 | struct media_interface intf; | |
c398bb64 MCC |
363 | |
364 | /* Should match the fields at media_v2_intf_devnode */ | |
27e543fa MCC |
365 | u32 major; |
366 | u32 minor; | |
367 | }; | |
368 | ||
60266185 MCC |
369 | /** |
370 | * media_entity_id() - return the media entity graph object id | |
371 | * | |
48a7c4ba | 372 | * @entity: pointer to &media_entity |
60266185 | 373 | */ |
fa762394 MCC |
374 | static inline u32 media_entity_id(struct media_entity *entity) |
375 | { | |
bfab2aac | 376 | return entity->graph_obj.id; |
fa762394 MCC |
377 | } |
378 | ||
60266185 MCC |
379 | /** |
380 | * media_type() - return the media object type | |
381 | * | |
48a7c4ba | 382 | * @gobj: Pointer to the struct &media_gobj graph object |
60266185 | 383 | */ |
ec6e4c95 MCC |
384 | static inline enum media_gobj_type media_type(struct media_gobj *gobj) |
385 | { | |
05b3b77c | 386 | return gobj->id >> MEDIA_BITS_PER_ID; |
ec6e4c95 MCC |
387 | } |
388 | ||
630c0e80 MCC |
389 | /** |
390 | * media_id() - return the media object ID | |
391 | * | |
48a7c4ba | 392 | * @gobj: Pointer to the struct &media_gobj graph object |
630c0e80 | 393 | */ |
05b3b77c | 394 | static inline u32 media_id(struct media_gobj *gobj) |
ec6e4c95 | 395 | { |
05b3b77c | 396 | return gobj->id & MEDIA_ID_MASK; |
ec6e4c95 MCC |
397 | } |
398 | ||
630c0e80 MCC |
399 | /** |
400 | * media_gobj_gen_id() - encapsulates type and ID on at the object ID | |
401 | * | |
402 | * @type: object type as define at enum &media_gobj_type. | |
48a7c4ba | 403 | * @local_id: next ID, from struct &media_device.id. |
630c0e80 | 404 | */ |
05b3b77c | 405 | static inline u32 media_gobj_gen_id(enum media_gobj_type type, u64 local_id) |
ec6e4c95 MCC |
406 | { |
407 | u32 id; | |
408 | ||
05b3b77c MCC |
409 | id = type << MEDIA_BITS_PER_ID; |
410 | id |= local_id & MEDIA_ID_MASK; | |
ec6e4c95 MCC |
411 | |
412 | return id; | |
413 | } | |
414 | ||
60266185 | 415 | /** |
45b46879 | 416 | * is_media_entity_v4l2_video_device() - Check if the entity is a video_device |
60266185 MCC |
417 | * @entity: pointer to entity |
418 | * | |
48a7c4ba | 419 | * Return: %true if the entity is an instance of a video_device object and can |
b76a2a8c | 420 | * safely be cast to a struct video_device using the container_of() macro, or |
48a7c4ba | 421 | * %false otherwise. |
60266185 | 422 | */ |
45b46879 | 423 | static inline bool is_media_entity_v4l2_video_device(struct media_entity *entity) |
fa17b46a | 424 | { |
b76a2a8c | 425 | return entity && entity->obj_type == MEDIA_ENTITY_TYPE_VIDEO_DEVICE; |
fa17b46a MCC |
426 | } |
427 | ||
60266185 | 428 | /** |
b76a2a8c | 429 | * is_media_entity_v4l2_subdev() - Check if the entity is a v4l2_subdev |
60266185 MCC |
430 | * @entity: pointer to entity |
431 | * | |
48a7c4ba MCC |
432 | * Return: %true if the entity is an instance of a &v4l2_subdev object and can |
433 | * safely be cast to a struct &v4l2_subdev using the container_of() macro, or | |
434 | * %false otherwise. | |
60266185 | 435 | */ |
fa17b46a MCC |
436 | static inline bool is_media_entity_v4l2_subdev(struct media_entity *entity) |
437 | { | |
b76a2a8c | 438 | return entity && entity->obj_type == MEDIA_ENTITY_TYPE_V4L2_SUBDEV; |
fa17b46a MCC |
439 | } |
440 | ||
92777994 MCC |
441 | /** |
442 | * __media_entity_enum_init - Initialise an entity enumeration | |
443 | * | |
444 | * @ent_enum: Entity enumeration to be initialised | |
445 | * @idx_max: Maximum number of entities in the enumeration | |
446 | * | |
447 | * Return: Returns zero on success or a negative error code. | |
448 | */ | |
c8d54cd5 SA |
449 | __must_check int __media_entity_enum_init(struct media_entity_enum *ent_enum, |
450 | int idx_max); | |
92777994 MCC |
451 | |
452 | /** | |
453 | * media_entity_enum_cleanup - Release resources of an entity enumeration | |
454 | * | |
455 | * @ent_enum: Entity enumeration to be released | |
456 | */ | |
457 | void media_entity_enum_cleanup(struct media_entity_enum *ent_enum); | |
a5ccc48a | 458 | |
c8d54cd5 SA |
459 | /** |
460 | * media_entity_enum_zero - Clear the entire enum | |
461 | * | |
03e49338 | 462 | * @ent_enum: Entity enumeration to be cleared |
ef69ee1b | 463 | */ |
c8d54cd5 SA |
464 | static inline void media_entity_enum_zero(struct media_entity_enum *ent_enum) |
465 | { | |
466 | bitmap_zero(ent_enum->bmap, ent_enum->idx_max); | |
467 | } | |
468 | ||
469 | /** | |
470 | * media_entity_enum_set - Mark a single entity in the enum | |
471 | * | |
03e49338 | 472 | * @ent_enum: Entity enumeration |
c8d54cd5 SA |
473 | * @entity: Entity to be marked |
474 | */ | |
475 | static inline void media_entity_enum_set(struct media_entity_enum *ent_enum, | |
476 | struct media_entity *entity) | |
477 | { | |
478 | if (WARN_ON(entity->internal_idx >= ent_enum->idx_max)) | |
479 | return; | |
480 | ||
481 | __set_bit(entity->internal_idx, ent_enum->bmap); | |
482 | } | |
483 | ||
484 | /** | |
485 | * media_entity_enum_clear - Unmark a single entity in the enum | |
486 | * | |
03e49338 | 487 | * @ent_enum: Entity enumeration |
c8d54cd5 SA |
488 | * @entity: Entity to be unmarked |
489 | */ | |
490 | static inline void media_entity_enum_clear(struct media_entity_enum *ent_enum, | |
491 | struct media_entity *entity) | |
492 | { | |
493 | if (WARN_ON(entity->internal_idx >= ent_enum->idx_max)) | |
494 | return; | |
495 | ||
496 | __clear_bit(entity->internal_idx, ent_enum->bmap); | |
497 | } | |
498 | ||
499 | /** | |
500 | * media_entity_enum_test - Test whether the entity is marked | |
501 | * | |
03e49338 | 502 | * @ent_enum: Entity enumeration |
c8d54cd5 SA |
503 | * @entity: Entity to be tested |
504 | * | |
48a7c4ba | 505 | * Returns %true if the entity was marked. |
c8d54cd5 SA |
506 | */ |
507 | static inline bool media_entity_enum_test(struct media_entity_enum *ent_enum, | |
508 | struct media_entity *entity) | |
509 | { | |
510 | if (WARN_ON(entity->internal_idx >= ent_enum->idx_max)) | |
511 | return true; | |
512 | ||
513 | return test_bit(entity->internal_idx, ent_enum->bmap); | |
514 | } | |
515 | ||
516 | /** | |
e383ce07 MCC |
517 | * media_entity_enum_test_and_set - Test whether the entity is marked, |
518 | * and mark it | |
c8d54cd5 | 519 | * |
03e49338 | 520 | * @ent_enum: Entity enumeration |
c8d54cd5 SA |
521 | * @entity: Entity to be tested |
522 | * | |
48a7c4ba | 523 | * Returns %true if the entity was marked, and mark it before doing so. |
c8d54cd5 | 524 | */ |
03e49338 MCC |
525 | static inline bool |
526 | media_entity_enum_test_and_set(struct media_entity_enum *ent_enum, | |
527 | struct media_entity *entity) | |
c8d54cd5 SA |
528 | { |
529 | if (WARN_ON(entity->internal_idx >= ent_enum->idx_max)) | |
530 | return true; | |
531 | ||
532 | return __test_and_set_bit(entity->internal_idx, ent_enum->bmap); | |
533 | } | |
534 | ||
535 | /** | |
03e49338 | 536 | * media_entity_enum_empty - Test whether the entire enum is empty |
c8d54cd5 | 537 | * |
03e49338 | 538 | * @ent_enum: Entity enumeration |
c8d54cd5 | 539 | * |
48a7c4ba | 540 | * Return: %true if the entity was empty. |
c8d54cd5 SA |
541 | */ |
542 | static inline bool media_entity_enum_empty(struct media_entity_enum *ent_enum) | |
543 | { | |
544 | return bitmap_empty(ent_enum->bmap, ent_enum->idx_max); | |
545 | } | |
546 | ||
547 | /** | |
548 | * media_entity_enum_intersects - Test whether two enums intersect | |
549 | * | |
03e49338 MCC |
550 | * @ent_enum1: First entity enumeration |
551 | * @ent_enum2: Second entity enumeration | |
c8d54cd5 | 552 | * |
48a7c4ba MCC |
553 | * Return: %true if entity enumerations @ent_enum1 and @ent_enum2 intersect, |
554 | * otherwise %false. | |
c8d54cd5 SA |
555 | */ |
556 | static inline bool media_entity_enum_intersects( | |
557 | struct media_entity_enum *ent_enum1, | |
558 | struct media_entity_enum *ent_enum2) | |
559 | { | |
560 | WARN_ON(ent_enum1->idx_max != ent_enum2->idx_max); | |
561 | ||
562 | return bitmap_intersects(ent_enum1->bmap, ent_enum2->bmap, | |
563 | min(ent_enum1->idx_max, ent_enum2->idx_max)); | |
564 | } | |
ef69ee1b | 565 | |
48a7c4ba MCC |
566 | /** |
567 | * gobj_to_entity - returns the struct &media_entity pointer from the | |
568 | * @gobj contained on it. | |
569 | * | |
570 | * @gobj: Pointer to the struct &media_gobj graph object | |
571 | */ | |
ec6e4c95 MCC |
572 | #define gobj_to_entity(gobj) \ |
573 | container_of(gobj, struct media_entity, graph_obj) | |
574 | ||
48a7c4ba | 575 | /** |
e383ce07 | 576 | * gobj_to_pad - returns the struct &media_pad pointer from the |
48a7c4ba MCC |
577 | * @gobj contained on it. |
578 | * | |
579 | * @gobj: Pointer to the struct &media_gobj graph object | |
580 | */ | |
39a956c4 MCC |
581 | #define gobj_to_pad(gobj) \ |
582 | container_of(gobj, struct media_pad, graph_obj) | |
583 | ||
48a7c4ba | 584 | /** |
e383ce07 | 585 | * gobj_to_link - returns the struct &media_link pointer from the |
48a7c4ba MCC |
586 | * @gobj contained on it. |
587 | * | |
588 | * @gobj: Pointer to the struct &media_gobj graph object | |
589 | */ | |
39a956c4 MCC |
590 | #define gobj_to_link(gobj) \ |
591 | container_of(gobj, struct media_link, graph_obj) | |
592 | ||
48a7c4ba | 593 | /** |
e383ce07 | 594 | * gobj_to_intf - returns the struct &media_interface pointer from the |
48a7c4ba MCC |
595 | * @gobj contained on it. |
596 | * | |
597 | * @gobj: Pointer to the struct &media_gobj graph object | |
598 | */ | |
27e543fa MCC |
599 | #define gobj_to_intf(gobj) \ |
600 | container_of(gobj, struct media_interface, graph_obj) | |
601 | ||
48a7c4ba | 602 | /** |
e383ce07 | 603 | * intf_to_devnode - returns the struct media_intf_devnode pointer from the |
48a7c4ba MCC |
604 | * @intf contained on it. |
605 | * | |
606 | * @intf: Pointer to struct &media_intf_devnode | |
607 | */ | |
27e543fa MCC |
608 | #define intf_to_devnode(intf) \ |
609 | container_of(intf, struct media_intf_devnode, intf) | |
610 | ||
1fc25d30 MCC |
611 | /** |
612 | * media_gobj_create - Initialize a graph object | |
613 | * | |
48a7c4ba | 614 | * @mdev: Pointer to the &media_device that contains the object |
1fc25d30 | 615 | * @type: Type of the object |
48a7c4ba | 616 | * @gobj: Pointer to the struct &media_gobj graph object |
1fc25d30 | 617 | * |
48a7c4ba MCC |
618 | * This routine initializes the embedded struct &media_gobj inside a |
619 | * media graph object. It is called automatically if ``media_*_create`` | |
620 | * function calls are used. However, if the object (entity, link, pad, | |
621 | * interface) is embedded on some other object, this function should be | |
622 | * called before registering the object at the media controller. | |
1fc25d30 | 623 | */ |
c350ef83 | 624 | void media_gobj_create(struct media_device *mdev, |
ec6e4c95 MCC |
625 | enum media_gobj_type type, |
626 | struct media_gobj *gobj); | |
1fc25d30 MCC |
627 | |
628 | /** | |
629 | * media_gobj_destroy - Stop using a graph object on a media device | |
630 | * | |
48a7c4ba | 631 | * @gobj: Pointer to the struct &media_gobj graph object |
1fc25d30 MCC |
632 | * |
633 | * This should be called by all routines like media_device_unregister() | |
634 | * that remove/destroy media graph objects. | |
635 | */ | |
c350ef83 | 636 | void media_gobj_destroy(struct media_gobj *gobj); |
ec6e4c95 | 637 | |
db7ee32a MCC |
638 | /** |
639 | * media_entity_pads_init() - Initialize the entity pads | |
640 | * | |
641 | * @entity: entity where the pads belong | |
1fc25d30 MCC |
642 | * @num_pads: total number of sink and source pads |
643 | * @pads: Array of @num_pads pads. | |
644 | * | |
645 | * The pads array is managed by the entity driver and passed to | |
48a7c4ba MCC |
646 | * media_entity_pads_init() where its pointer will be stored in the |
647 | * &media_entity structure. | |
db7ee32a MCC |
648 | * |
649 | * If no pads are needed, drivers could either directly fill | |
48a7c4ba | 650 | * &media_entity->num_pads with 0 and &media_entity->pads with %NULL or call |
db7ee32a MCC |
651 | * this function that will do the same. |
652 | * | |
653 | * As the number of pads is known in advance, the pads array is not allocated | |
654 | * dynamically but is managed by the entity driver. Most drivers will embed the | |
655 | * pads array in a driver-specific structure, avoiding dynamic allocation. | |
656 | * | |
657 | * Drivers must set the direction of every pad in the pads array before calling | |
658 | * media_entity_pads_init(). The function will initialize the other pads fields. | |
659 | */ | |
ab22e77c | 660 | int media_entity_pads_init(struct media_entity *entity, u16 num_pads, |
57208e5e | 661 | struct media_pad *pads); |
f1fd3289 | 662 | |
db7ee32a MCC |
663 | /** |
664 | * media_entity_cleanup() - free resources associated with an entity | |
665 | * | |
666 | * @entity: entity where the pads belong | |
667 | * | |
668 | * This function must be called during the cleanup phase after unregistering | |
669 | * the entity (currently, it does nothing). | |
443bf23d LP |
670 | * |
671 | * Calling media_entity_cleanup() on a media_entity whose memory has been | |
672 | * zeroed but that has not been initialized with media_entity_pad_init() is | |
673 | * valid and is a no-op. | |
db7ee32a | 674 | */ |
3580112b SA |
675 | #if IS_ENABLED(CONFIG_MEDIA_CONTROLLER) |
676 | static inline void media_entity_cleanup(struct media_entity *entity) {} | |
677 | #else | |
678 | #define media_entity_cleanup(entity) do { } while (false) | |
679 | #endif | |
e02188c9 | 680 | |
9d6d20e6 MCC |
681 | /** |
682 | * media_get_pad_index() - retrieves a pad index from an entity | |
683 | * | |
684 | * @entity: entity where the pads belong | |
685 | * @is_sink: true if the pad is a sink, false if it is a source | |
686 | * @sig_type: type of signal of the pad to be search | |
687 | * | |
688 | * This helper function finds the first pad index inside an entity that | |
689 | * satisfies both @is_sink and @sig_type conditions. | |
690 | * | |
691 | * Return: | |
692 | * | |
693 | * On success, return the pad number. If the pad was not found or the media | |
694 | * entity is a NULL pointer, return -EINVAL. | |
695 | */ | |
696 | int media_get_pad_index(struct media_entity *entity, bool is_sink, | |
697 | enum media_pad_signal_type sig_type); | |
698 | ||
db7ee32a MCC |
699 | /** |
700 | * media_create_pad_link() - creates a link between two entities. | |
701 | * | |
702 | * @source: pointer to &media_entity of the source pad. | |
703 | * @source_pad: number of the source pad in the pads array | |
704 | * @sink: pointer to &media_entity of the sink pad. | |
705 | * @sink_pad: number of the sink pad in the pads array. | |
48a7c4ba MCC |
706 | * @flags: Link flags, as defined in |
707 | * :ref:`include/uapi/linux/media.h <media_header>` | |
708 | * ( seek for ``MEDIA_LNK_FL_*``) | |
db7ee32a MCC |
709 | * |
710 | * Valid values for flags: | |
db7ee32a | 711 | * |
48a7c4ba MCC |
712 | * %MEDIA_LNK_FL_ENABLED |
713 | * Indicates that the link is enabled and can be used to transfer media data. | |
714 | * When two or more links target a sink pad, only one of them can be | |
715 | * enabled at a time. | |
74604b73 | 716 | * |
48a7c4ba MCC |
717 | * %MEDIA_LNK_FL_IMMUTABLE |
718 | * Indicates that the link enabled state can't be modified at runtime. If | |
719 | * %MEDIA_LNK_FL_IMMUTABLE is set, then %MEDIA_LNK_FL_ENABLED must also be | |
720 | * set, since an immutable link is always enabled. | |
db7ee32a | 721 | * |
74604b73 | 722 | * .. note:: |
db7ee32a | 723 | * |
74604b73 MCC |
724 | * Before calling this function, media_entity_pads_init() and |
725 | * media_device_register_entity() should be called previously for both ends. | |
db7ee32a | 726 | */ |
77328043 MCC |
727 | __must_check int media_create_pad_link(struct media_entity *source, |
728 | u16 source_pad, struct media_entity *sink, | |
729 | u16 sink_pad, u32 flags); | |
b01cc9ce MCC |
730 | |
731 | /** | |
732 | * media_create_pad_links() - creates a link between two entities. | |
733 | * | |
734 | * @mdev: Pointer to the media_device that contains the object | |
735 | * @source_function: Function of the source entities. Used only if @source is | |
736 | * NULL. | |
737 | * @source: pointer to &media_entity of the source pad. If NULL, it will use | |
48a7c4ba | 738 | * all entities that matches the @sink_function. |
b01cc9ce MCC |
739 | * @source_pad: number of the source pad in the pads array |
740 | * @sink_function: Function of the sink entities. Used only if @sink is NULL. | |
741 | * @sink: pointer to &media_entity of the sink pad. If NULL, it will use | |
48a7c4ba | 742 | * all entities that matches the @sink_function. |
b01cc9ce MCC |
743 | * @sink_pad: number of the sink pad in the pads array. |
744 | * @flags: Link flags, as defined in include/uapi/linux/media.h. | |
48a7c4ba | 745 | * @allow_both_undefined: if %true, then both @source and @sink can be NULL. |
b01cc9ce MCC |
746 | * In such case, it will create a crossbar between all entities that |
747 | * matches @source_function to all entities that matches @sink_function. | |
48a7c4ba | 748 | * If %false, it will return 0 and won't create any link if both @source |
b01cc9ce MCC |
749 | * and @sink are NULL. |
750 | * | |
751 | * Valid values for flags: | |
74604b73 | 752 | * |
b01cc9ce MCC |
753 | * A %MEDIA_LNK_FL_ENABLED flag indicates that the link is enabled and can be |
754 | * used to transfer media data. If multiple links are created and this | |
755 | * flag is passed as an argument, only the first created link will have | |
756 | * this flag. | |
757 | * | |
758 | * A %MEDIA_LNK_FL_IMMUTABLE flag indicates that the link enabled state can't | |
759 | * be modified at runtime. If %MEDIA_LNK_FL_IMMUTABLE is set, then | |
760 | * %MEDIA_LNK_FL_ENABLED must also be set since an immutable link is | |
761 | * always enabled. | |
762 | * | |
763 | * It is common for some devices to have multiple source and/or sink entities | |
764 | * of the same type that should be linked. While media_create_pad_link() | |
765 | * creates link by link, this function is meant to allow 1:n, n:1 and even | |
766 | * cross-bar (n:n) links. | |
767 | * | |
48a7c4ba MCC |
768 | * .. note:: |
769 | * | |
770 | * Before calling this function, media_entity_pads_init() and | |
771 | * media_device_register_entity() should be called previously for the | |
772 | * entities to be linked. | |
b01cc9ce MCC |
773 | */ |
774 | int media_create_pad_links(const struct media_device *mdev, | |
775 | const u32 source_function, | |
776 | struct media_entity *source, | |
777 | const u16 source_pad, | |
778 | const u32 sink_function, | |
779 | struct media_entity *sink, | |
780 | const u16 sink_pad, | |
781 | u32 flags, | |
782 | const bool allow_both_undefined); | |
783 | ||
7349cec1 | 784 | void __media_entity_remove_links(struct media_entity *entity); |
db7ee32a MCC |
785 | |
786 | /** | |
787 | * media_entity_remove_links() - remove all links associated with an entity | |
788 | * | |
789 | * @entity: pointer to &media_entity | |
790 | * | |
74604b73 MCC |
791 | * .. note:: |
792 | * | |
793 | * This is called automatically when an entity is unregistered via | |
794 | * media_device_register_entity(). | |
db7ee32a | 795 | */ |
7349cec1 SN |
796 | void media_entity_remove_links(struct media_entity *entity); |
797 | ||
1fc25d30 MCC |
798 | /** |
799 | * __media_entity_setup_link - Configure a media link without locking | |
800 | * @link: The link being configured | |
801 | * @flags: Link configuration flags | |
802 | * | |
803 | * The bulk of link setup is handled by the two entities connected through the | |
804 | * link. This function notifies both entities of the link configuration change. | |
805 | * | |
806 | * If the link is immutable or if the current and new configuration are | |
807 | * identical, return immediately. | |
808 | * | |
809 | * The user is expected to hold link->source->parent->mutex. If not, | |
810 | * media_entity_setup_link() should be used instead. | |
811 | */ | |
97548ed4 | 812 | int __media_entity_setup_link(struct media_link *link, u32 flags); |
db7ee32a MCC |
813 | |
814 | /** | |
815 | * media_entity_setup_link() - changes the link flags properties in runtime | |
816 | * | |
817 | * @link: pointer to &media_link | |
818 | * @flags: the requested new link flags | |
819 | * | |
820 | * The only configurable property is the %MEDIA_LNK_FL_ENABLED link flag | |
91bbbf24 | 821 | * to enable/disable a link. Links marked with the |
db7ee32a MCC |
822 | * %MEDIA_LNK_FL_IMMUTABLE link flag can not be enabled or disabled. |
823 | * | |
824 | * When a link is enabled or disabled, the media framework calls the | |
825 | * link_setup operation for the two entities at the source and sink of the | |
826 | * link, in that order. If the second link_setup call fails, another | |
827 | * link_setup call is made on the first entity to restore the original link | |
828 | * flags. | |
829 | * | |
830 | * Media device drivers can be notified of link setup operations by setting the | |
48a7c4ba | 831 | * &media_device.link_notify pointer to a callback function. If provided, the |
db7ee32a MCC |
832 | * notification callback will be called before enabling and after disabling |
833 | * links. | |
834 | * | |
835 | * Entity drivers must implement the link_setup operation if any of their links | |
836 | * is non-immutable. The operation must either configure the hardware or store | |
837 | * the configuration information to be applied later. | |
838 | * | |
839 | * Link configuration must not have any side effect on other links. If an | |
840 | * enabled link at a sink pad prevents another link at the same pad from | |
48a7c4ba | 841 | * being enabled, the link_setup operation must return %-EBUSY and can't |
db7ee32a MCC |
842 | * implicitly disable the first enabled link. |
843 | * | |
74604b73 MCC |
844 | * .. note:: |
845 | * | |
846 | * The valid values of the flags for the link is the same as described | |
847 | * on media_create_pad_link(), for pad to pad links or the same as described | |
848 | * on media_create_intf_link(), for interface to entity links. | |
db7ee32a | 849 | */ |
97548ed4 | 850 | int media_entity_setup_link(struct media_link *link, u32 flags); |
1fc25d30 MCC |
851 | |
852 | /** | |
853 | * media_entity_find_link - Find a link between two pads | |
854 | * @source: Source pad | |
855 | * @sink: Sink pad | |
856 | * | |
48a7c4ba MCC |
857 | * Return: returns a pointer to the link between the two entities. If no |
858 | * such link exists, return %NULL. | |
1fc25d30 | 859 | */ |
97548ed4 LP |
860 | struct media_link *media_entity_find_link(struct media_pad *source, |
861 | struct media_pad *sink); | |
1fc25d30 MCC |
862 | |
863 | /** | |
b2e44430 | 864 | * media_pad_remote_pad_first - Find the first pad at the remote end of a link |
1fc25d30 MCC |
865 | * @pad: Pad at the local end of the link |
866 | * | |
867 | * Search for a remote pad connected to the given pad by iterating over all | |
868 | * links originating or terminating at that pad until an enabled link is found. | |
869 | * | |
48a7c4ba MCC |
870 | * Return: returns a pointer to the pad at the remote end of the first found |
871 | * enabled link, or %NULL if no enabled link has been found. | |
1fc25d30 | 872 | */ |
b2e44430 | 873 | struct media_pad *media_pad_remote_pad_first(const struct media_pad *pad); |
53e269c1 | 874 | |
03b28286 LP |
875 | /** |
876 | * media_pad_remote_pad_unique - Find a remote pad connected to a pad | |
877 | * @pad: The pad | |
878 | * | |
879 | * Search for and return a remote pad connected to @pad through an enabled | |
880 | * link. If multiple (or no) remote pads are found, an error is returned. | |
881 | * | |
882 | * The uniqueness constraint makes this helper function suitable for entities | |
883 | * that support a single active source at a time on a given pad. | |
884 | * | |
885 | * Return: A pointer to the remote pad, or one of the following error pointers | |
886 | * if an error occurs: | |
887 | * | |
888 | * * -ENOTUNIQ - Multiple links are enabled | |
889 | * * -ENOLINK - No connected pad found | |
890 | */ | |
891 | struct media_pad *media_pad_remote_pad_unique(const struct media_pad *pad); | |
892 | ||
5680fe45 LP |
893 | /** |
894 | * media_entity_remote_pad_unique - Find a remote pad connected to an entity | |
895 | * @entity: The entity | |
896 | * @type: The type of pad to find (MEDIA_PAD_FL_SINK or MEDIA_PAD_FL_SOURCE) | |
897 | * | |
898 | * Search for and return a remote pad of @type connected to @entity through an | |
899 | * enabled link. If multiple (or no) remote pads match these criteria, an error | |
900 | * is returned. | |
901 | * | |
902 | * The uniqueness constraint makes this helper function suitable for entities | |
903 | * that support a single active source or sink at a time. | |
904 | * | |
905 | * Return: A pointer to the remote pad, or one of the following error pointers | |
906 | * if an error occurs: | |
907 | * | |
908 | * * -ENOTUNIQ - Multiple links are enabled | |
909 | * * -ENOLINK - No connected pad found | |
910 | */ | |
911 | struct media_pad * | |
912 | media_entity_remote_pad_unique(const struct media_entity *entity, | |
913 | unsigned int type); | |
914 | ||
915 | /** | |
916 | * media_entity_remote_source_pad_unique - Find a remote source pad connected to | |
917 | * an entity | |
918 | * @entity: The entity | |
919 | * | |
920 | * Search for and return a remote source pad connected to @entity through an | |
921 | * enabled link. If multiple (or no) remote pads match these criteria, an error | |
922 | * is returned. | |
923 | * | |
924 | * The uniqueness constraint makes this helper function suitable for entities | |
925 | * that support a single active source at a time. | |
926 | * | |
927 | * Return: A pointer to the remote pad, or one of the following error pointers | |
928 | * if an error occurs: | |
929 | * | |
930 | * * -ENOTUNIQ - Multiple links are enabled | |
931 | * * -ENOLINK - No connected pad found | |
932 | */ | |
933 | static inline struct media_pad * | |
934 | media_entity_remote_source_pad_unique(const struct media_entity *entity) | |
935 | { | |
936 | return media_entity_remote_pad_unique(entity, MEDIA_PAD_FL_SOURCE); | |
937 | } | |
938 | ||
f17bc788 LP |
939 | /** |
940 | * media_entity_is_streaming - Test if an entity is part of a streaming pipeline | |
941 | * @entity: The entity | |
942 | * | |
943 | * Return: True if the entity is part of a pipeline started with the | |
944 | * media_pipeline_start() function, false otherwise. | |
945 | */ | |
946 | static inline bool media_entity_is_streaming(const struct media_entity *entity) | |
947 | { | |
3056a8e9 | 948 | return entity->pipe; |
f17bc788 LP |
949 | } |
950 | ||
d295c6a4 NS |
951 | /** |
952 | * media_entity_get_fwnode_pad - Get pad number from fwnode | |
953 | * | |
954 | * @entity: The entity | |
955 | * @fwnode: Pointer to the fwnode_handle which should be used to find the pad | |
956 | * @direction_flags: Expected direction of the pad, as defined in | |
957 | * :ref:`include/uapi/linux/media.h <media_header>` | |
958 | * (seek for ``MEDIA_PAD_FL_*``) | |
959 | * | |
960 | * This function can be used to resolve the media pad number from | |
961 | * a fwnode. This is useful for devices which use more complex | |
962 | * mappings of media pads. | |
963 | * | |
f0a3fa21 | 964 | * If the entity does not implement the get_fwnode_pad() operation |
d295c6a4 NS |
965 | * then this function searches the entity for the first pad that |
966 | * matches the @direction_flags. | |
967 | * | |
968 | * Return: returns the pad number on success or a negative error code. | |
969 | */ | |
970 | int media_entity_get_fwnode_pad(struct media_entity *entity, | |
971 | struct fwnode_handle *fwnode, | |
972 | unsigned long direction_flags); | |
973 | ||
48a7c4ba | 974 | /** |
20b85227 | 975 | * media_graph_walk_init - Allocate resources used by graph walk. |
48a7c4ba MCC |
976 | * |
977 | * @graph: Media graph structure that will be used to walk the graph | |
978 | * @mdev: Pointer to the &media_device that contains the object | |
4ebddb7c SA |
979 | * |
980 | * The caller is required to hold the media_device graph_mutex during the graph | |
981 | * walk until the graph state is released. | |
982 | * | |
983 | * Returns zero on success or a negative error code otherwise. | |
48a7c4ba | 984 | */ |
20b85227 SA |
985 | __must_check int media_graph_walk_init( |
986 | struct media_graph *graph, struct media_device *mdev); | |
aa360d3d MCC |
987 | |
988 | /** | |
20b85227 | 989 | * media_graph_walk_cleanup - Release resources used by graph walk. |
aa360d3d MCC |
990 | * |
991 | * @graph: Media graph structure that will be used to walk the graph | |
992 | */ | |
20b85227 | 993 | void media_graph_walk_cleanup(struct media_graph *graph); |
e03d2203 | 994 | |
1fc25d30 | 995 | /** |
20b85227 | 996 | * media_graph_walk_start - Start walking the media graph at a |
48a7c4ba MCC |
997 | * given entity |
998 | * | |
1fc25d30 MCC |
999 | * @graph: Media graph structure that will be used to walk the graph |
1000 | * @entity: Starting entity | |
1001 | * | |
20b85227 | 1002 | * Before using this function, media_graph_walk_init() must be |
e03d2203 SA |
1003 | * used to allocate resources used for walking the graph. This |
1004 | * function initializes the graph traversal structure to walk the | |
1005 | * entities graph starting at the given entity. The traversal | |
1006 | * structure must not be modified by the caller during graph | |
1007 | * traversal. After the graph walk, the resources must be released | |
20b85227 | 1008 | * using media_graph_walk_cleanup(). |
1fc25d30 | 1009 | */ |
20b85227 SA |
1010 | void media_graph_walk_start(struct media_graph *graph, |
1011 | struct media_entity *entity); | |
1fc25d30 MCC |
1012 | |
1013 | /** | |
20b85227 | 1014 | * media_graph_walk_next - Get the next entity in the graph |
1fc25d30 MCC |
1015 | * @graph: Media graph structure |
1016 | * | |
1017 | * Perform a depth-first traversal of the given media entities graph. | |
1018 | * | |
1019 | * The graph structure must have been previously initialized with a call to | |
20b85227 | 1020 | * media_graph_walk_start(). |
1fc25d30 | 1021 | * |
48a7c4ba MCC |
1022 | * Return: returns the next entity in the graph or %NULL if the whole graph |
1023 | * have been traversed. | |
1fc25d30 | 1024 | */ |
20b85227 | 1025 | struct media_entity *media_graph_walk_next(struct media_graph *graph); |
1fc25d30 MCC |
1026 | |
1027 | /** | |
20b85227 | 1028 | * media_pipeline_start - Mark a pipeline as streaming |
1fc25d30 MCC |
1029 | * @entity: Starting entity |
1030 | * @pipe: Media pipeline to be assigned to all entities in the pipeline. | |
1031 | * | |
1032 | * Mark all entities connected to a given entity through enabled links, either | |
48a7c4ba MCC |
1033 | * directly or indirectly, as streaming. The given pipeline object is assigned |
1034 | * to every entity in the pipeline and stored in the media_entity pipe field. | |
1fc25d30 MCC |
1035 | * |
1036 | * Calls to this function can be nested, in which case the same number of | |
20b85227 | 1037 | * media_pipeline_stop() calls will be required to stop streaming. The |
1fc25d30 | 1038 | * pipeline pointer must be identical for all nested calls to |
20b85227 | 1039 | * media_pipeline_start(). |
1fc25d30 | 1040 | */ |
20b85227 SA |
1041 | __must_check int media_pipeline_start(struct media_entity *entity, |
1042 | struct media_pipeline *pipe); | |
fb49f204 | 1043 | /** |
20b85227 | 1044 | * __media_pipeline_start - Mark a pipeline as streaming |
fb49f204 SK |
1045 | * |
1046 | * @entity: Starting entity | |
1047 | * @pipe: Media pipeline to be assigned to all entities in the pipeline. | |
1048 | * | |
20b85227 | 1049 | * ..note:: This is the non-locking version of media_pipeline_start() |
fb49f204 | 1050 | */ |
20b85227 SA |
1051 | __must_check int __media_pipeline_start(struct media_entity *entity, |
1052 | struct media_pipeline *pipe); | |
1fc25d30 MCC |
1053 | |
1054 | /** | |
20b85227 | 1055 | * media_pipeline_stop - Mark a pipeline as not streaming |
1fc25d30 MCC |
1056 | * @entity: Starting entity |
1057 | * | |
1058 | * Mark all entities connected to a given entity through enabled links, either | |
1059 | * directly or indirectly, as not streaming. The media_entity pipe field is | |
48a7c4ba | 1060 | * reset to %NULL. |
1fc25d30 | 1061 | * |
20b85227 | 1062 | * If multiple calls to media_pipeline_start() have been made, the same |
1fc25d30 MCC |
1063 | * number of calls to this function are required to mark the pipeline as not |
1064 | * streaming. | |
1065 | */ | |
20b85227 | 1066 | void media_pipeline_stop(struct media_entity *entity); |
a5ccc48a | 1067 | |
fb49f204 | 1068 | /** |
20b85227 | 1069 | * __media_pipeline_stop - Mark a pipeline as not streaming |
fb49f204 SK |
1070 | * |
1071 | * @entity: Starting entity | |
1072 | * | |
20b85227 | 1073 | * .. note:: This is the non-locking version of media_pipeline_stop() |
fb49f204 | 1074 | */ |
20b85227 | 1075 | void __media_pipeline_stop(struct media_entity *entity); |
fb49f204 | 1076 | |
db7ee32a MCC |
1077 | /** |
1078 | * media_devnode_create() - creates and initializes a device node interface | |
1079 | * | |
1080 | * @mdev: pointer to struct &media_device | |
48a7c4ba MCC |
1081 | * @type: type of the interface, as given by |
1082 | * :ref:`include/uapi/linux/media.h <media_header>` | |
1083 | * ( seek for ``MEDIA_INTF_T_*``) macros. | |
1084 | * @flags: Interface flags, as defined in | |
1085 | * :ref:`include/uapi/linux/media.h <media_header>` | |
1086 | * ( seek for ``MEDIA_INTF_FL_*``) | |
db7ee32a MCC |
1087 | * @major: Device node major number. |
1088 | * @minor: Device node minor number. | |
1089 | * | |
1090 | * Return: if succeeded, returns a pointer to the newly allocated | |
1091 | * &media_intf_devnode pointer. | |
48a7c4ba MCC |
1092 | * |
1093 | * .. note:: | |
1094 | * | |
1095 | * Currently, no flags for &media_interface is defined. | |
db7ee32a | 1096 | */ |
5e5387df MCC |
1097 | struct media_intf_devnode * |
1098 | __must_check media_devnode_create(struct media_device *mdev, | |
1099 | u32 type, u32 flags, | |
0b3b72df | 1100 | u32 major, u32 minor); |
db7ee32a MCC |
1101 | /** |
1102 | * media_devnode_remove() - removes a device node interface | |
1103 | * | |
1104 | * @devnode: pointer to &media_intf_devnode to be freed. | |
1105 | * | |
1106 | * When a device node interface is removed, all links to it are automatically | |
1107 | * removed. | |
1108 | */ | |
27e543fa | 1109 | void media_devnode_remove(struct media_intf_devnode *devnode); |
db7ee32a MCC |
1110 | |
1111 | /** | |
1112 | * media_create_intf_link() - creates a link between an entity and an interface | |
1113 | * | |
1114 | * @entity: pointer to %media_entity | |
1115 | * @intf: pointer to %media_interface | |
48a7c4ba MCC |
1116 | * @flags: Link flags, as defined in |
1117 | * :ref:`include/uapi/linux/media.h <media_header>` | |
1118 | * ( seek for ``MEDIA_LNK_FL_*``) | |
db7ee32a MCC |
1119 | * |
1120 | * | |
1121 | * Valid values for flags: | |
db7ee32a | 1122 | * |
48a7c4ba MCC |
1123 | * %MEDIA_LNK_FL_ENABLED |
1124 | * Indicates that the interface is connected to the entity hardware. | |
1125 | * That's the default value for interfaces. An interface may be disabled if | |
1126 | * the hardware is busy due to the usage of some other interface that it is | |
1127 | * currently controlling the hardware. | |
1128 | * | |
74604b73 MCC |
1129 | * A typical example is an hybrid TV device that handle only one type of |
1130 | * stream on a given time. So, when the digital TV is streaming, | |
1131 | * the V4L2 interfaces won't be enabled, as such device is not able to | |
1132 | * also stream analog TV or radio. | |
1133 | * | |
1134 | * .. note:: | |
db7ee32a | 1135 | * |
74604b73 MCC |
1136 | * Before calling this function, media_devnode_create() should be called for |
1137 | * the interface and media_device_register_entity() should be called for the | |
1138 | * interface that will be part of the link. | |
db7ee32a | 1139 | */ |
3c9b04d9 | 1140 | struct media_link * |
5e5387df MCC |
1141 | __must_check media_create_intf_link(struct media_entity *entity, |
1142 | struct media_interface *intf, | |
1143 | u32 flags); | |
60266185 MCC |
1144 | /** |
1145 | * __media_remove_intf_link() - remove a single interface link | |
1146 | * | |
1147 | * @link: pointer to &media_link. | |
1148 | * | |
74604b73 | 1149 | * .. note:: This is an unlocked version of media_remove_intf_link() |
60266185 | 1150 | */ |
d47109fa | 1151 | void __media_remove_intf_link(struct media_link *link); |
60266185 MCC |
1152 | |
1153 | /** | |
1154 | * media_remove_intf_link() - remove a single interface link | |
1155 | * | |
1156 | * @link: pointer to &media_link. | |
1157 | * | |
74604b73 | 1158 | * .. note:: Prefer to use this one, instead of __media_remove_intf_link() |
60266185 | 1159 | */ |
86e26620 | 1160 | void media_remove_intf_link(struct media_link *link); |
60266185 MCC |
1161 | |
1162 | /** | |
1163 | * __media_remove_intf_links() - remove all links associated with an interface | |
1164 | * | |
1165 | * @intf: pointer to &media_interface | |
1166 | * | |
74604b73 | 1167 | * .. note:: This is an unlocked version of media_remove_intf_links(). |
60266185 | 1168 | */ |
7c4696a9 | 1169 | void __media_remove_intf_links(struct media_interface *intf); |
92777994 | 1170 | |
db7ee32a MCC |
1171 | /** |
1172 | * media_remove_intf_links() - remove all links associated with an interface | |
1173 | * | |
1174 | * @intf: pointer to &media_interface | |
1175 | * | |
f58cad22 | 1176 | * .. note:: |
60266185 | 1177 | * |
f58cad22 MCC |
1178 | * #) This is called automatically when an entity is unregistered via |
1179 | * media_device_register_entity() and by media_devnode_remove(). | |
60266185 | 1180 | * |
f58cad22 | 1181 | * #) Prefer to use this one, instead of __media_remove_intf_links(). |
db7ee32a | 1182 | */ |
7c4696a9 MCC |
1183 | void media_remove_intf_links(struct media_interface *intf); |
1184 | ||
48a7c4ba MCC |
1185 | /** |
1186 | * media_entity_call - Calls a struct media_entity_operations operation on | |
1187 | * an entity | |
1188 | * | |
1189 | * @entity: entity where the @operation will be called | |
1190 | * @operation: type of the operation. Should be the name of a member of | |
1191 | * struct &media_entity_operations. | |
1192 | * | |
1193 | * This helper function will check if @operation is not %NULL. On such case, | |
1194 | * it will issue a call to @operation\(@entity, @args\). | |
1195 | */ | |
1196 | ||
97548ed4 LP |
1197 | #define media_entity_call(entity, operation, args...) \ |
1198 | (((entity)->ops && (entity)->ops->operation) ? \ | |
1199 | (entity)->ops->operation((entity) , ##args) : -ENOIOCTLCMD) | |
1200 | ||
012c87f7 DS |
1201 | /** |
1202 | * media_create_ancillary_link() - create an ancillary link between two | |
1203 | * instances of &media_entity | |
1204 | * | |
1205 | * @primary: pointer to the primary &media_entity | |
1206 | * @ancillary: pointer to the ancillary &media_entity | |
1207 | * | |
1208 | * Create an ancillary link between two entities, indicating that they | |
1209 | * represent two connected pieces of hardware that form a single logical unit. | |
1210 | * A typical example is a camera lens controller being linked to the sensor that | |
1211 | * it is supporting. | |
1212 | * | |
1213 | * The function sets both MEDIA_LNK_FL_ENABLED and MEDIA_LNK_FL_IMMUTABLE for | |
1214 | * the new link. | |
1215 | */ | |
1216 | struct media_link * | |
1217 | media_create_ancillary_link(struct media_entity *primary, | |
1218 | struct media_entity *ancillary); | |
1219 | ||
1ed3d644 DS |
1220 | /** |
1221 | * __media_entity_next_link() - Iterate through a &media_entity's links | |
1222 | * | |
1223 | * @entity: pointer to the &media_entity | |
1224 | * @link: pointer to a &media_link to hold the iterated values | |
1225 | * @link_type: one of the MEDIA_LNK_FL_LINK_TYPE flags | |
1226 | * | |
1227 | * Return the next link against an entity matching a specific link type. This | |
1228 | * allows iteration through an entity's links whilst guaranteeing all of the | |
1229 | * returned links are of the given type. | |
1230 | */ | |
1231 | struct media_link *__media_entity_next_link(struct media_entity *entity, | |
1232 | struct media_link *link, | |
1233 | unsigned long link_type); | |
1234 | ||
1235 | /** | |
1236 | * for_each_media_entity_data_link() - Iterate through an entity's data links | |
1237 | * | |
1238 | * @entity: pointer to the &media_entity | |
1239 | * @link: pointer to a &media_link to hold the iterated values | |
1240 | * | |
1241 | * Iterate over a &media_entity's data links | |
1242 | */ | |
1243 | #define for_each_media_entity_data_link(entity, link) \ | |
1244 | for (link = __media_entity_next_link(entity, NULL, \ | |
1245 | MEDIA_LNK_FL_DATA_LINK); \ | |
1246 | link; \ | |
1247 | link = __media_entity_next_link(entity, link, \ | |
1248 | MEDIA_LNK_FL_DATA_LINK)) | |
1249 | ||
53e269c1 | 1250 | #endif |