Commit | Line | Data |
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53e269c1 LP |
1 | /* |
2 | * Media entity | |
3 | * | |
4 | * Copyright (C) 2010 Nokia Corporation | |
5 | * | |
6 | * Contacts: Laurent Pinchart <laurent.pinchart@ideasonboard.com> | |
7 | * Sakari Ailus <sakari.ailus@iki.fi> | |
8 | * | |
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. | |
12 | * | |
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. | |
17 | * | |
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 | |
21 | */ | |
22 | ||
23 | #ifndef _MEDIA_ENTITY_H | |
24 | #define _MEDIA_ENTITY_H | |
25 | ||
c8d54cd5 | 26 | #include <linux/bitmap.h> |
0149a2e1 | 27 | #include <linux/kernel.h> |
53e269c1 | 28 | #include <linux/list.h> |
1651333b | 29 | #include <linux/media.h> |
53e269c1 | 30 | |
ec6e4c95 MCC |
31 | /* Enums used internally at the media controller to represent graphs */ |
32 | ||
33 | /** | |
34 | * enum media_gobj_type - type of a graph object | |
35 | * | |
bfab2aac | 36 | * @MEDIA_GRAPH_ENTITY: Identify a media entity |
18710dc6 | 37 | * @MEDIA_GRAPH_PAD: Identify a media pad |
6b6a4278 | 38 | * @MEDIA_GRAPH_LINK: Identify a media link |
27e543fa MCC |
39 | * @MEDIA_GRAPH_INTF_DEVNODE: Identify a media Kernel API interface via |
40 | * a device node | |
ec6e4c95 MCC |
41 | */ |
42 | enum media_gobj_type { | |
bfab2aac | 43 | MEDIA_GRAPH_ENTITY, |
18710dc6 | 44 | MEDIA_GRAPH_PAD, |
6b6a4278 | 45 | MEDIA_GRAPH_LINK, |
27e543fa | 46 | MEDIA_GRAPH_INTF_DEVNODE, |
ec6e4c95 MCC |
47 | }; |
48 | ||
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) | |
52 | ||
53 | /* Structs to represent the objects that belong to a media graph */ | |
54 | ||
55 | /** | |
56 | * struct media_gobj - Define a graph object. | |
57 | * | |
c358e80d | 58 | * @mdev: Pointer to the struct media_device that owns the object |
ec6e4c95 MCC |
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"). | |
c358e80d | 64 | * @list: List entry stored in one of the per-type mdev object lists |
ec6e4c95 MCC |
65 | * |
66 | * All objects on the media graph should have this struct embedded | |
67 | */ | |
68 | struct media_gobj { | |
39a956c4 | 69 | struct media_device *mdev; |
ec6e4c95 | 70 | u32 id; |
05bfa9fa | 71 | struct list_head list; |
ec6e4c95 MCC |
72 | }; |
73 | ||
c8d54cd5 SA |
74 | #define MEDIA_ENTITY_ENUM_MAX_DEPTH 16 |
75 | #define MEDIA_ENTITY_ENUM_MAX_ID 64 | |
76 | ||
77 | /* | |
78 | * The number of pads can't be bigger than the number of entities, | |
79 | * as the worse-case scenario is to have one entity linked up to | |
80 | * MEDIA_ENTITY_ENUM_MAX_ID - 1 entities. | |
81 | */ | |
82 | #define MEDIA_ENTITY_MAX_PADS (MEDIA_ENTITY_ENUM_MAX_ID - 1) | |
83 | ||
84 | /** | |
85 | * struct media_entity_enum - An enumeration of media entities. | |
86 | * | |
87 | * @prealloc_bmap: Pre-allocated space reserved for media entities if the | |
88 | * total number of entities does not exceed | |
89 | * MEDIA_ENTITY_ENUM_MAX_ID. | |
90 | * @bmap: Bit map in which each bit represents one entity at struct | |
91 | * media_entity->internal_idx. | |
92 | * @idx_max: Number of bits in bmap | |
93 | */ | |
94 | struct media_entity_enum { | |
95 | DECLARE_BITMAP(prealloc_bmap, MEDIA_ENTITY_ENUM_MAX_ID); | |
96 | unsigned long *bmap; | |
97 | int idx_max; | |
98 | }; | |
99 | ||
434257f1 SA |
100 | /** |
101 | * struct media_entity_graph - Media graph traversal state | |
102 | * | |
103 | * @stack: Graph traversal stack; the stack contains information | |
104 | * on the path the media entities to be walked and the | |
105 | * links through which they were reached. | |
106 | * @entities: Visited entities | |
107 | * @top: The top of the stack | |
108 | */ | |
82c68290 SA |
109 | struct media_entity_graph { |
110 | struct { | |
111 | struct media_entity *entity; | |
112 | struct list_head *link; | |
113 | } stack[MEDIA_ENTITY_ENUM_MAX_DEPTH]; | |
114 | ||
115 | DECLARE_BITMAP(entities, MEDIA_ENTITY_ENUM_MAX_ID); | |
116 | int top; | |
117 | }; | |
118 | ||
5dd8775d SA |
119 | /* |
120 | * struct media_pipeline - Media pipeline related information | |
121 | * | |
122 | * @graph: Media graph walk during pipeline start / stop | |
123 | */ | |
e02188c9 | 124 | struct media_pipeline { |
5dd8775d | 125 | struct media_entity_graph graph; |
e02188c9 LP |
126 | }; |
127 | ||
c358e80d MCC |
128 | /** |
129 | * struct media_link - A link object part of a media graph. | |
130 | * | |
131 | * @graph_obj: Embedded structure containing the media object common data | |
132 | * @list: Linked list associated with an entity or an interface that | |
133 | * owns the link. | |
134 | * @gobj0: Part of a union. Used to get the pointer for the first | |
135 | * graph_object of the link. | |
136 | * @source: Part of a union. Used only if the first object (gobj0) is | |
137 | * a pad. In that case, it represents the source pad. | |
138 | * @intf: Part of a union. Used only if the first object (gobj0) is | |
139 | * an interface. | |
140 | * @gobj1: Part of a union. Used to get the pointer for the second | |
141 | * graph_object of the link. | |
142 | * @source: Part of a union. Used only if the second object (gobj1) is | |
143 | * a pad. In that case, it represents the sink pad. | |
144 | * @entity: Part of a union. Used only if the second object (gobj1) is | |
145 | * an entity. | |
146 | * @reverse: Pointer to the link for the reverse direction of a pad to pad | |
147 | * link. | |
148 | * @flags: Link flags, as defined in uapi/media.h (MEDIA_LNK_FL_*) | |
39d1ebc6 | 149 | * @is_backlink: Indicate if the link is a backlink. |
c358e80d | 150 | */ |
53e269c1 | 151 | struct media_link { |
6b6a4278 | 152 | struct media_gobj graph_obj; |
57208e5e | 153 | struct list_head list; |
4b8a3c08 MCC |
154 | union { |
155 | struct media_gobj *gobj0; | |
156 | struct media_pad *source; | |
86e26620 | 157 | struct media_interface *intf; |
4b8a3c08 MCC |
158 | }; |
159 | union { | |
160 | struct media_gobj *gobj1; | |
161 | struct media_pad *sink; | |
86e26620 | 162 | struct media_entity *entity; |
4b8a3c08 | 163 | }; |
c358e80d MCC |
164 | struct media_link *reverse; |
165 | unsigned long flags; | |
39d1ebc6 | 166 | bool is_backlink; |
53e269c1 LP |
167 | }; |
168 | ||
c358e80d MCC |
169 | /** |
170 | * struct media_pad - A media pad graph object. | |
171 | * | |
172 | * @graph_obj: Embedded structure containing the media object common data | |
173 | * @entity: Entity this pad belongs to | |
174 | * @index: Pad index in the entity pads array, numbered from 0 to n | |
175 | * @flags: Pad flags, as defined in uapi/media.h (MEDIA_PAD_FL_*) | |
176 | */ | |
53e269c1 | 177 | struct media_pad { |
4b8a3c08 | 178 | struct media_gobj graph_obj; /* must be first field in struct */ |
c358e80d MCC |
179 | struct media_entity *entity; |
180 | u16 index; | |
181 | unsigned long flags; | |
53e269c1 LP |
182 | }; |
183 | ||
5a5394be LP |
184 | /** |
185 | * struct media_entity_operations - Media entity operations | |
186 | * @link_setup: Notify the entity of link changes. The operation can | |
187 | * return an error, in which case link setup will be | |
188 | * cancelled. Optional. | |
189 | * @link_validate: Return whether a link is valid from the entity point of | |
190 | * view. The media_entity_pipeline_start() function | |
191 | * validates all links by calling this operation. Optional. | |
192 | */ | |
97548ed4 LP |
193 | struct media_entity_operations { |
194 | int (*link_setup)(struct media_entity *entity, | |
195 | const struct media_pad *local, | |
196 | const struct media_pad *remote, u32 flags); | |
af88be38 | 197 | int (*link_validate)(struct media_link *link); |
97548ed4 LP |
198 | }; |
199 | ||
c358e80d MCC |
200 | /** |
201 | * struct media_entity - A media entity graph object. | |
202 | * | |
203 | * @graph_obj: Embedded structure containing the media object common data. | |
204 | * @name: Entity name. | |
0e576b76 MCC |
205 | * @function: Entity main function, as defined in uapi/media.h |
206 | * (MEDIA_ENT_F_*) | |
c358e80d | 207 | * @flags: Entity flags, as defined in uapi/media.h (MEDIA_ENT_FL_*) |
c358e80d MCC |
208 | * @num_pads: Number of sink and source pads. |
209 | * @num_links: Total number of links, forward and back, enabled and disabled. | |
210 | * @num_backlinks: Number of backlinks | |
665faa97 SA |
211 | * @internal_idx: An unique internal entity specific number. The numbers are |
212 | * re-used if entities are unregistered or registered again. | |
c358e80d MCC |
213 | * @pads: Pads array with the size defined by @num_pads. |
214 | * @links: List of data links. | |
215 | * @ops: Entity operations. | |
216 | * @stream_count: Stream count for the entity. | |
217 | * @use_count: Use count for the entity. | |
218 | * @pipe: Pipeline this entity belongs to. | |
219 | * @info: Union with devnode information. Kept just for backward | |
220 | * compatibility. | |
221 | * @major: Devnode major number (zero if not applicable). Kept just | |
222 | * for backward compatibility. | |
223 | * @minor: Devnode minor number (zero if not applicable). Kept just | |
224 | * for backward compatibility. | |
225 | * | |
226 | * NOTE: @stream_count and @use_count reference counts must never be | |
227 | * negative, but are signed integers on purpose: a simple WARN_ON(<0) check | |
228 | * can be used to detect reference count bugs that would make them negative. | |
229 | */ | |
53e269c1 | 230 | struct media_entity { |
4b8a3c08 | 231 | struct media_gobj graph_obj; /* must be first field in struct */ |
c358e80d | 232 | const char *name; |
0e576b76 | 233 | u32 function; |
c358e80d | 234 | unsigned long flags; |
53e269c1 | 235 | |
c358e80d MCC |
236 | u16 num_pads; |
237 | u16 num_links; | |
238 | u16 num_backlinks; | |
665faa97 | 239 | int internal_idx; |
53e269c1 | 240 | |
c358e80d MCC |
241 | struct media_pad *pads; |
242 | struct list_head links; | |
53e269c1 | 243 | |
c358e80d | 244 | const struct media_entity_operations *ops; |
97548ed4 | 245 | |
503c3d82 LP |
246 | /* Reference counts must never be negative, but are signed integers on |
247 | * purpose: a simple WARN_ON(<0) check can be used to detect reference | |
248 | * count bugs that would make them negative. | |
249 | */ | |
c358e80d MCC |
250 | int stream_count; |
251 | int use_count; | |
503c3d82 | 252 | |
c358e80d | 253 | struct media_pipeline *pipe; |
e02188c9 | 254 | |
53e269c1 | 255 | union { |
53e269c1 LP |
256 | struct { |
257 | u32 major; | |
258 | u32 minor; | |
e31a0ba7 | 259 | } dev; |
fa5034c6 | 260 | } info; |
53e269c1 LP |
261 | }; |
262 | ||
27e543fa | 263 | /** |
c358e80d | 264 | * struct media_interface - A media interface graph object. |
27e543fa MCC |
265 | * |
266 | * @graph_obj: embedded graph object | |
86e26620 | 267 | * @links: List of links pointing to graph entities |
c358e80d | 268 | * @type: Type of the interface as defined in the |
27e543fa MCC |
269 | * uapi/media/media.h header, e. g. |
270 | * MEDIA_INTF_T_* | |
c358e80d | 271 | * @flags: Interface flags as defined in uapi/media/media.h |
27e543fa MCC |
272 | */ |
273 | struct media_interface { | |
274 | struct media_gobj graph_obj; | |
86e26620 | 275 | struct list_head links; |
27e543fa MCC |
276 | u32 type; |
277 | u32 flags; | |
278 | }; | |
279 | ||
280 | /** | |
c358e80d | 281 | * struct media_intf_devnode - A media interface via a device node. |
27e543fa MCC |
282 | * |
283 | * @intf: embedded interface object | |
284 | * @major: Major number of a device node | |
285 | * @minor: Minor number of a device node | |
286 | */ | |
287 | struct media_intf_devnode { | |
288 | struct media_interface intf; | |
c398bb64 MCC |
289 | |
290 | /* Should match the fields at media_v2_intf_devnode */ | |
27e543fa MCC |
291 | u32 major; |
292 | u32 minor; | |
293 | }; | |
294 | ||
60266185 MCC |
295 | /** |
296 | * media_entity_id() - return the media entity graph object id | |
297 | * | |
298 | * @entity: pointer to entity | |
299 | */ | |
fa762394 MCC |
300 | static inline u32 media_entity_id(struct media_entity *entity) |
301 | { | |
bfab2aac | 302 | return entity->graph_obj.id; |
fa762394 MCC |
303 | } |
304 | ||
60266185 MCC |
305 | /** |
306 | * media_type() - return the media object type | |
307 | * | |
308 | * @gobj: pointer to the media graph object | |
309 | */ | |
ec6e4c95 MCC |
310 | static inline enum media_gobj_type media_type(struct media_gobj *gobj) |
311 | { | |
312 | return gobj->id >> MEDIA_BITS_PER_LOCAL_ID; | |
313 | } | |
314 | ||
315 | static inline u32 media_localid(struct media_gobj *gobj) | |
316 | { | |
317 | return gobj->id & MEDIA_LOCAL_ID_MASK; | |
318 | } | |
319 | ||
320 | static inline u32 media_gobj_gen_id(enum media_gobj_type type, u32 local_id) | |
321 | { | |
322 | u32 id; | |
323 | ||
324 | id = type << MEDIA_BITS_PER_LOCAL_ID; | |
325 | id |= local_id & MEDIA_LOCAL_ID_MASK; | |
326 | ||
327 | return id; | |
328 | } | |
329 | ||
60266185 MCC |
330 | /** |
331 | * is_media_entity_v4l2_io() - identify if the entity main function | |
332 | * is a V4L2 I/O | |
333 | * | |
334 | * @entity: pointer to entity | |
335 | * | |
336 | * Return: true if the entity main function is one of the V4L2 I/O types | |
337 | * (video, VBI or SDR radio); false otherwise. | |
338 | */ | |
fa17b46a MCC |
339 | static inline bool is_media_entity_v4l2_io(struct media_entity *entity) |
340 | { | |
341 | if (!entity) | |
342 | return false; | |
343 | ||
0e576b76 | 344 | switch (entity->function) { |
4ca72efa MCC |
345 | case MEDIA_ENT_F_IO_V4L: |
346 | case MEDIA_ENT_F_IO_VBI: | |
347 | case MEDIA_ENT_F_IO_SWRADIO: | |
fa17b46a MCC |
348 | return true; |
349 | default: | |
350 | return false; | |
351 | } | |
352 | } | |
353 | ||
60266185 MCC |
354 | /** |
355 | * is_media_entity_v4l2_subdev - return true if the entity main function is | |
356 | * associated with the V4L2 API subdev usage | |
357 | * | |
358 | * @entity: pointer to entity | |
359 | * | |
360 | * This is an ancillary function used by subdev-based V4L2 drivers. | |
361 | * It checks if the entity function is one of functions used by a V4L2 subdev, | |
362 | * e. g. camera-relatef functions, analog TV decoder, TV tuner, V4L2 DSPs. | |
363 | */ | |
fa17b46a MCC |
364 | static inline bool is_media_entity_v4l2_subdev(struct media_entity *entity) |
365 | { | |
366 | if (!entity) | |
367 | return false; | |
368 | ||
0e576b76 | 369 | switch (entity->function) { |
4ca72efa MCC |
370 | case MEDIA_ENT_F_V4L2_SUBDEV_UNKNOWN: |
371 | case MEDIA_ENT_F_CAM_SENSOR: | |
372 | case MEDIA_ENT_F_FLASH: | |
373 | case MEDIA_ENT_F_LENS: | |
374 | case MEDIA_ENT_F_ATV_DECODER: | |
375 | case MEDIA_ENT_F_TUNER: | |
fa17b46a MCC |
376 | return true; |
377 | ||
378 | default: | |
379 | return false; | |
380 | } | |
381 | } | |
382 | ||
c8d54cd5 SA |
383 | __must_check int __media_entity_enum_init(struct media_entity_enum *ent_enum, |
384 | int idx_max); | |
385 | void media_entity_enum_cleanup(struct media_entity_enum *e); | |
a5ccc48a | 386 | |
c8d54cd5 SA |
387 | /** |
388 | * media_entity_enum_zero - Clear the entire enum | |
389 | * | |
390 | * @e: Entity enumeration to be cleared | |
ef69ee1b | 391 | */ |
c8d54cd5 SA |
392 | static inline void media_entity_enum_zero(struct media_entity_enum *ent_enum) |
393 | { | |
394 | bitmap_zero(ent_enum->bmap, ent_enum->idx_max); | |
395 | } | |
396 | ||
397 | /** | |
398 | * media_entity_enum_set - Mark a single entity in the enum | |
399 | * | |
400 | * @e: Entity enumeration | |
401 | * @entity: Entity to be marked | |
402 | */ | |
403 | static inline void media_entity_enum_set(struct media_entity_enum *ent_enum, | |
404 | struct media_entity *entity) | |
405 | { | |
406 | if (WARN_ON(entity->internal_idx >= ent_enum->idx_max)) | |
407 | return; | |
408 | ||
409 | __set_bit(entity->internal_idx, ent_enum->bmap); | |
410 | } | |
411 | ||
412 | /** | |
413 | * media_entity_enum_clear - Unmark a single entity in the enum | |
414 | * | |
415 | * @e: Entity enumeration | |
416 | * @entity: Entity to be unmarked | |
417 | */ | |
418 | static inline void media_entity_enum_clear(struct media_entity_enum *ent_enum, | |
419 | struct media_entity *entity) | |
420 | { | |
421 | if (WARN_ON(entity->internal_idx >= ent_enum->idx_max)) | |
422 | return; | |
423 | ||
424 | __clear_bit(entity->internal_idx, ent_enum->bmap); | |
425 | } | |
426 | ||
427 | /** | |
428 | * media_entity_enum_test - Test whether the entity is marked | |
429 | * | |
430 | * @e: Entity enumeration | |
431 | * @entity: Entity to be tested | |
432 | * | |
433 | * Returns true if the entity was marked. | |
434 | */ | |
435 | static inline bool media_entity_enum_test(struct media_entity_enum *ent_enum, | |
436 | struct media_entity *entity) | |
437 | { | |
438 | if (WARN_ON(entity->internal_idx >= ent_enum->idx_max)) | |
439 | return true; | |
440 | ||
441 | return test_bit(entity->internal_idx, ent_enum->bmap); | |
442 | } | |
443 | ||
444 | /** | |
445 | * media_entity_enum_test - Test whether the entity is marked, and mark it | |
446 | * | |
447 | * @e: Entity enumeration | |
448 | * @entity: Entity to be tested | |
449 | * | |
450 | * Returns true if the entity was marked, and mark it before doing so. | |
451 | */ | |
452 | static inline bool media_entity_enum_test_and_set( | |
453 | struct media_entity_enum *ent_enum, struct media_entity *entity) | |
454 | { | |
455 | if (WARN_ON(entity->internal_idx >= ent_enum->idx_max)) | |
456 | return true; | |
457 | ||
458 | return __test_and_set_bit(entity->internal_idx, ent_enum->bmap); | |
459 | } | |
460 | ||
461 | /** | |
462 | * media_entity_enum_test - Test whether the entire enum is empty | |
463 | * | |
464 | * @e: Entity enumeration | |
465 | * @entity: Entity to be tested | |
466 | * | |
467 | * Returns true if the entity was marked. | |
468 | */ | |
469 | static inline bool media_entity_enum_empty(struct media_entity_enum *ent_enum) | |
470 | { | |
471 | return bitmap_empty(ent_enum->bmap, ent_enum->idx_max); | |
472 | } | |
473 | ||
474 | /** | |
475 | * media_entity_enum_intersects - Test whether two enums intersect | |
476 | * | |
477 | * @e: First entity enumeration | |
478 | * @f: Second entity enumeration | |
479 | * | |
480 | * Returns true if entity enumerations e and f intersect, otherwise false. | |
481 | */ | |
482 | static inline bool media_entity_enum_intersects( | |
483 | struct media_entity_enum *ent_enum1, | |
484 | struct media_entity_enum *ent_enum2) | |
485 | { | |
486 | WARN_ON(ent_enum1->idx_max != ent_enum2->idx_max); | |
487 | ||
488 | return bitmap_intersects(ent_enum1->bmap, ent_enum2->bmap, | |
489 | min(ent_enum1->idx_max, ent_enum2->idx_max)); | |
490 | } | |
ef69ee1b | 491 | |
ec6e4c95 MCC |
492 | #define gobj_to_entity(gobj) \ |
493 | container_of(gobj, struct media_entity, graph_obj) | |
494 | ||
39a956c4 MCC |
495 | #define gobj_to_pad(gobj) \ |
496 | container_of(gobj, struct media_pad, graph_obj) | |
497 | ||
498 | #define gobj_to_link(gobj) \ | |
499 | container_of(gobj, struct media_link, graph_obj) | |
500 | ||
27e543fa MCC |
501 | #define gobj_to_link(gobj) \ |
502 | container_of(gobj, struct media_link, graph_obj) | |
503 | ||
504 | #define gobj_to_pad(gobj) \ | |
505 | container_of(gobj, struct media_pad, graph_obj) | |
506 | ||
507 | #define gobj_to_intf(gobj) \ | |
508 | container_of(gobj, struct media_interface, graph_obj) | |
509 | ||
510 | #define intf_to_devnode(intf) \ | |
511 | container_of(intf, struct media_intf_devnode, intf) | |
512 | ||
1fc25d30 MCC |
513 | /** |
514 | * media_gobj_create - Initialize a graph object | |
515 | * | |
516 | * @mdev: Pointer to the media_device that contains the object | |
517 | * @type: Type of the object | |
518 | * @gobj: Pointer to the graph object | |
519 | * | |
520 | * This routine initializes the embedded struct media_gobj inside a | |
521 | * media graph object. It is called automatically if media_*_create() | |
522 | * calls are used. However, if the object (entity, link, pad, interface) | |
523 | * is embedded on some other object, this function should be called before | |
524 | * registering the object at the media controller. | |
525 | */ | |
c350ef83 | 526 | void media_gobj_create(struct media_device *mdev, |
ec6e4c95 MCC |
527 | enum media_gobj_type type, |
528 | struct media_gobj *gobj); | |
1fc25d30 MCC |
529 | |
530 | /** | |
531 | * media_gobj_destroy - Stop using a graph object on a media device | |
532 | * | |
533 | * @gobj: Pointer to the graph object | |
534 | * | |
535 | * This should be called by all routines like media_device_unregister() | |
536 | * that remove/destroy media graph objects. | |
537 | */ | |
c350ef83 | 538 | void media_gobj_destroy(struct media_gobj *gobj); |
ec6e4c95 | 539 | |
db7ee32a MCC |
540 | /** |
541 | * media_entity_pads_init() - Initialize the entity pads | |
542 | * | |
543 | * @entity: entity where the pads belong | |
1fc25d30 MCC |
544 | * @num_pads: total number of sink and source pads |
545 | * @pads: Array of @num_pads pads. | |
546 | * | |
547 | * The pads array is managed by the entity driver and passed to | |
548 | * media_entity_pads_init() where its pointer will be stored in the entity | |
549 | * structure. | |
db7ee32a MCC |
550 | * |
551 | * If no pads are needed, drivers could either directly fill | |
552 | * &media_entity->@num_pads with 0 and &media_entity->@pads with NULL or call | |
553 | * this function that will do the same. | |
554 | * | |
555 | * As the number of pads is known in advance, the pads array is not allocated | |
556 | * dynamically but is managed by the entity driver. Most drivers will embed the | |
557 | * pads array in a driver-specific structure, avoiding dynamic allocation. | |
558 | * | |
559 | * Drivers must set the direction of every pad in the pads array before calling | |
560 | * media_entity_pads_init(). The function will initialize the other pads fields. | |
561 | */ | |
ab22e77c | 562 | int media_entity_pads_init(struct media_entity *entity, u16 num_pads, |
57208e5e | 563 | struct media_pad *pads); |
f1fd3289 | 564 | |
db7ee32a MCC |
565 | /** |
566 | * media_entity_cleanup() - free resources associated with an entity | |
567 | * | |
568 | * @entity: entity where the pads belong | |
569 | * | |
570 | * This function must be called during the cleanup phase after unregistering | |
571 | * the entity (currently, it does nothing). | |
572 | */ | |
f1fd3289 | 573 | static inline void media_entity_cleanup(struct media_entity *entity) {}; |
e02188c9 | 574 | |
db7ee32a MCC |
575 | /** |
576 | * media_create_pad_link() - creates a link between two entities. | |
577 | * | |
578 | * @source: pointer to &media_entity of the source pad. | |
579 | * @source_pad: number of the source pad in the pads array | |
580 | * @sink: pointer to &media_entity of the sink pad. | |
581 | * @sink_pad: number of the sink pad in the pads array. | |
582 | * @flags: Link flags, as defined in include/uapi/linux/media.h. | |
583 | * | |
584 | * Valid values for flags: | |
585 | * A %MEDIA_LNK_FL_ENABLED flag indicates that the link is enabled and can be | |
586 | * used to transfer media data. When two or more links target a sink pad, | |
587 | * only one of them can be enabled at a time. | |
588 | * | |
589 | * A %MEDIA_LNK_FL_IMMUTABLE flag indicates that the link enabled state can't | |
590 | * be modified at runtime. If %MEDIA_LNK_FL_IMMUTABLE is set, then | |
591 | * %MEDIA_LNK_FL_ENABLED must also be set since an immutable link is | |
592 | * always enabled. | |
593 | * | |
594 | * NOTE: | |
595 | * | |
596 | * Before calling this function, media_entity_pads_init() and | |
597 | * media_device_register_entity() should be called previously for both ends. | |
598 | */ | |
77328043 MCC |
599 | __must_check int media_create_pad_link(struct media_entity *source, |
600 | u16 source_pad, struct media_entity *sink, | |
601 | u16 sink_pad, u32 flags); | |
7349cec1 | 602 | void __media_entity_remove_links(struct media_entity *entity); |
db7ee32a MCC |
603 | |
604 | /** | |
605 | * media_entity_remove_links() - remove all links associated with an entity | |
606 | * | |
607 | * @entity: pointer to &media_entity | |
608 | * | |
609 | * Note: this is called automatically when an entity is unregistered via | |
610 | * media_device_register_entity(). | |
611 | */ | |
7349cec1 SN |
612 | void media_entity_remove_links(struct media_entity *entity); |
613 | ||
1fc25d30 MCC |
614 | /** |
615 | * __media_entity_setup_link - Configure a media link without locking | |
616 | * @link: The link being configured | |
617 | * @flags: Link configuration flags | |
618 | * | |
619 | * The bulk of link setup is handled by the two entities connected through the | |
620 | * link. This function notifies both entities of the link configuration change. | |
621 | * | |
622 | * If the link is immutable or if the current and new configuration are | |
623 | * identical, return immediately. | |
624 | * | |
625 | * The user is expected to hold link->source->parent->mutex. If not, | |
626 | * media_entity_setup_link() should be used instead. | |
627 | */ | |
97548ed4 | 628 | int __media_entity_setup_link(struct media_link *link, u32 flags); |
db7ee32a MCC |
629 | |
630 | /** | |
631 | * media_entity_setup_link() - changes the link flags properties in runtime | |
632 | * | |
633 | * @link: pointer to &media_link | |
634 | * @flags: the requested new link flags | |
635 | * | |
636 | * The only configurable property is the %MEDIA_LNK_FL_ENABLED link flag | |
637 | * flag to enable/disable a link. Links marked with the | |
638 | * %MEDIA_LNK_FL_IMMUTABLE link flag can not be enabled or disabled. | |
639 | * | |
640 | * When a link is enabled or disabled, the media framework calls the | |
641 | * link_setup operation for the two entities at the source and sink of the | |
642 | * link, in that order. If the second link_setup call fails, another | |
643 | * link_setup call is made on the first entity to restore the original link | |
644 | * flags. | |
645 | * | |
646 | * Media device drivers can be notified of link setup operations by setting the | |
647 | * media_device::link_notify pointer to a callback function. If provided, the | |
648 | * notification callback will be called before enabling and after disabling | |
649 | * links. | |
650 | * | |
651 | * Entity drivers must implement the link_setup operation if any of their links | |
652 | * is non-immutable. The operation must either configure the hardware or store | |
653 | * the configuration information to be applied later. | |
654 | * | |
655 | * Link configuration must not have any side effect on other links. If an | |
656 | * enabled link at a sink pad prevents another link at the same pad from | |
657 | * being enabled, the link_setup operation must return -EBUSY and can't | |
658 | * implicitly disable the first enabled link. | |
659 | * | |
660 | * NOTE: the valid values of the flags for the link is the same as described | |
661 | * on media_create_pad_link(), for pad to pad links or the same as described | |
662 | * on media_create_intf_link(), for interface to entity links. | |
663 | */ | |
97548ed4 | 664 | int media_entity_setup_link(struct media_link *link, u32 flags); |
1fc25d30 MCC |
665 | |
666 | /** | |
667 | * media_entity_find_link - Find a link between two pads | |
668 | * @source: Source pad | |
669 | * @sink: Sink pad | |
670 | * | |
671 | * Return a pointer to the link between the two entities. If no such link | |
672 | * exists, return NULL. | |
673 | */ | |
97548ed4 LP |
674 | struct media_link *media_entity_find_link(struct media_pad *source, |
675 | struct media_pad *sink); | |
1fc25d30 MCC |
676 | |
677 | /** | |
678 | * media_entity_remote_pad - Find the pad at the remote end of a link | |
679 | * @pad: Pad at the local end of the link | |
680 | * | |
681 | * Search for a remote pad connected to the given pad by iterating over all | |
682 | * links originating or terminating at that pad until an enabled link is found. | |
683 | * | |
684 | * Return a pointer to the pad at the remote end of the first found enabled | |
685 | * link, or NULL if no enabled link has been found. | |
686 | */ | |
1bddf1b3 | 687 | struct media_pad *media_entity_remote_pad(struct media_pad *pad); |
53e269c1 | 688 | |
1fc25d30 MCC |
689 | /** |
690 | * media_entity_get - Get a reference to the parent module | |
691 | * | |
692 | * @entity: The entity | |
693 | * | |
694 | * Get a reference to the parent media device module. | |
695 | * | |
696 | * The function will return immediately if @entity is NULL. | |
697 | * | |
698 | * Return a pointer to the entity on success or NULL on failure. | |
699 | */ | |
503c3d82 | 700 | struct media_entity *media_entity_get(struct media_entity *entity); |
1fc25d30 | 701 | |
e03d2203 SA |
702 | __must_check int media_entity_graph_walk_init( |
703 | struct media_entity_graph *graph, struct media_device *mdev); | |
704 | void media_entity_graph_walk_cleanup(struct media_entity_graph *graph); | |
705 | ||
1fc25d30 MCC |
706 | /** |
707 | * media_entity_put - Release the reference to the parent module | |
708 | * | |
709 | * @entity: The entity | |
710 | * | |
711 | * Release the reference count acquired by media_entity_get(). | |
712 | * | |
713 | * The function will return immediately if @entity is NULL. | |
714 | */ | |
503c3d82 LP |
715 | void media_entity_put(struct media_entity *entity); |
716 | ||
1fc25d30 MCC |
717 | /** |
718 | * media_entity_graph_walk_start - Start walking the media graph at a given entity | |
719 | * @graph: Media graph structure that will be used to walk the graph | |
720 | * @entity: Starting entity | |
721 | * | |
e03d2203 SA |
722 | * Before using this function, media_entity_graph_walk_init() must be |
723 | * used to allocate resources used for walking the graph. This | |
724 | * function initializes the graph traversal structure to walk the | |
725 | * entities graph starting at the given entity. The traversal | |
726 | * structure must not be modified by the caller during graph | |
727 | * traversal. After the graph walk, the resources must be released | |
728 | * using media_entity_graph_walk_cleanup(). | |
1fc25d30 | 729 | */ |
a5ccc48a | 730 | void media_entity_graph_walk_start(struct media_entity_graph *graph, |
e03d2203 | 731 | struct media_entity *entity); |
1fc25d30 MCC |
732 | |
733 | /** | |
734 | * media_entity_graph_walk_next - Get the next entity in the graph | |
735 | * @graph: Media graph structure | |
736 | * | |
737 | * Perform a depth-first traversal of the given media entities graph. | |
738 | * | |
739 | * The graph structure must have been previously initialized with a call to | |
740 | * media_entity_graph_walk_start(). | |
741 | * | |
742 | * Return the next entity in the graph or NULL if the whole graph have been | |
743 | * traversed. | |
744 | */ | |
a5ccc48a SA |
745 | struct media_entity * |
746 | media_entity_graph_walk_next(struct media_entity_graph *graph); | |
1fc25d30 MCC |
747 | |
748 | /** | |
749 | * media_entity_pipeline_start - Mark a pipeline as streaming | |
750 | * @entity: Starting entity | |
751 | * @pipe: Media pipeline to be assigned to all entities in the pipeline. | |
752 | * | |
753 | * Mark all entities connected to a given entity through enabled links, either | |
754 | * directly or indirectly, as streaming. The given pipeline object is assigned to | |
755 | * every entity in the pipeline and stored in the media_entity pipe field. | |
756 | * | |
757 | * Calls to this function can be nested, in which case the same number of | |
758 | * media_entity_pipeline_stop() calls will be required to stop streaming. The | |
759 | * pipeline pointer must be identical for all nested calls to | |
760 | * media_entity_pipeline_start(). | |
761 | */ | |
af88be38 SA |
762 | __must_check int media_entity_pipeline_start(struct media_entity *entity, |
763 | struct media_pipeline *pipe); | |
1fc25d30 MCC |
764 | |
765 | /** | |
766 | * media_entity_pipeline_stop - Mark a pipeline as not streaming | |
767 | * @entity: Starting entity | |
768 | * | |
769 | * Mark all entities connected to a given entity through enabled links, either | |
770 | * directly or indirectly, as not streaming. The media_entity pipe field is | |
771 | * reset to NULL. | |
772 | * | |
773 | * If multiple calls to media_entity_pipeline_start() have been made, the same | |
774 | * number of calls to this function are required to mark the pipeline as not | |
775 | * streaming. | |
776 | */ | |
e02188c9 | 777 | void media_entity_pipeline_stop(struct media_entity *entity); |
a5ccc48a | 778 | |
db7ee32a MCC |
779 | /** |
780 | * media_devnode_create() - creates and initializes a device node interface | |
781 | * | |
782 | * @mdev: pointer to struct &media_device | |
783 | * @type: type of the interface, as given by MEDIA_INTF_T_* macros | |
784 | * as defined in the uapi/media/media.h header. | |
785 | * @flags: Interface flags as defined in uapi/media/media.h. | |
786 | * @major: Device node major number. | |
787 | * @minor: Device node minor number. | |
788 | * | |
789 | * Return: if succeeded, returns a pointer to the newly allocated | |
790 | * &media_intf_devnode pointer. | |
791 | */ | |
5e5387df MCC |
792 | struct media_intf_devnode * |
793 | __must_check media_devnode_create(struct media_device *mdev, | |
794 | u32 type, u32 flags, | |
0b3b72df | 795 | u32 major, u32 minor); |
db7ee32a MCC |
796 | /** |
797 | * media_devnode_remove() - removes a device node interface | |
798 | * | |
799 | * @devnode: pointer to &media_intf_devnode to be freed. | |
800 | * | |
801 | * When a device node interface is removed, all links to it are automatically | |
802 | * removed. | |
803 | */ | |
27e543fa | 804 | void media_devnode_remove(struct media_intf_devnode *devnode); |
5e5387df | 805 | struct media_link * |
db7ee32a MCC |
806 | |
807 | /** | |
808 | * media_create_intf_link() - creates a link between an entity and an interface | |
809 | * | |
810 | * @entity: pointer to %media_entity | |
811 | * @intf: pointer to %media_interface | |
812 | * @flags: Link flags, as defined in include/uapi/linux/media.h. | |
813 | * | |
814 | * | |
815 | * Valid values for flags: | |
816 | * The %MEDIA_LNK_FL_ENABLED flag indicates that the interface is connected to | |
817 | * the entity hardware. That's the default value for interfaces. An | |
818 | * interface may be disabled if the hardware is busy due to the usage | |
819 | * of some other interface that it is currently controlling the hardware. | |
820 | * A typical example is an hybrid TV device that handle only one type of | |
821 | * stream on a given time. So, when the digital TV is streaming, | |
822 | * the V4L2 interfaces won't be enabled, as such device is not able to | |
823 | * also stream analog TV or radio. | |
824 | * | |
825 | * Note: | |
826 | * | |
827 | * Before calling this function, media_devnode_create() should be called for | |
828 | * the interface and media_device_register_entity() should be called for the | |
829 | * interface that will be part of the link. | |
830 | */ | |
5e5387df MCC |
831 | __must_check media_create_intf_link(struct media_entity *entity, |
832 | struct media_interface *intf, | |
833 | u32 flags); | |
60266185 MCC |
834 | /** |
835 | * __media_remove_intf_link() - remove a single interface link | |
836 | * | |
837 | * @link: pointer to &media_link. | |
838 | * | |
839 | * Note: this is an unlocked version of media_remove_intf_link() | |
840 | */ | |
d47109fa | 841 | void __media_remove_intf_link(struct media_link *link); |
60266185 MCC |
842 | |
843 | /** | |
844 | * media_remove_intf_link() - remove a single interface link | |
845 | * | |
846 | * @link: pointer to &media_link. | |
847 | * | |
848 | * Note: prefer to use this one, instead of __media_remove_intf_link() | |
849 | */ | |
86e26620 | 850 | void media_remove_intf_link(struct media_link *link); |
60266185 MCC |
851 | |
852 | /** | |
853 | * __media_remove_intf_links() - remove all links associated with an interface | |
854 | * | |
855 | * @intf: pointer to &media_interface | |
856 | * | |
857 | * Note: this is an unlocked version of media_remove_intf_links(). | |
858 | */ | |
7c4696a9 | 859 | void __media_remove_intf_links(struct media_interface *intf); |
db7ee32a MCC |
860 | /** |
861 | * media_remove_intf_links() - remove all links associated with an interface | |
862 | * | |
863 | * @intf: pointer to &media_interface | |
864 | * | |
60266185 MCC |
865 | * Notes: |
866 | * | |
867 | * this is called automatically when an entity is unregistered via | |
db7ee32a | 868 | * media_device_register_entity() and by media_devnode_remove(). |
60266185 MCC |
869 | * |
870 | * Prefer to use this one, instead of __media_remove_intf_links(). | |
db7ee32a | 871 | */ |
7c4696a9 MCC |
872 | void media_remove_intf_links(struct media_interface *intf); |
873 | ||
86e26620 | 874 | |
97548ed4 LP |
875 | #define media_entity_call(entity, operation, args...) \ |
876 | (((entity)->ops && (entity)->ops->operation) ? \ | |
877 | (entity)->ops->operation((entity) , ##args) : -ENOIOCTLCMD) | |
878 | ||
53e269c1 | 879 | #endif |