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e5931c34 JC |
1 | /* |
2 | * Copyright (C) 2011 The Android Open Source Project | |
3 | * | |
4 | * Licensed under the Apache License, Version 2.0 (the "License"); | |
5 | * you may not use this file except in compliance with the License. | |
6 | * You may obtain a copy of the License at | |
7 | * | |
8 | * http://www.apache.org/licenses/LICENSE-2.0 | |
9 | * | |
10 | * Unless required by applicable law or agreed to in writing, software | |
11 | * distributed under the License is distributed on an "AS IS" BASIS, | |
12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | |
13 | * See the License for the specific language governing permissions and | |
14 | * limitations under the License. | |
15 | */ | |
16 | ||
17 | /*! | |
18 | * \file exynos_mc.c | |
19 | * \brief source file for libexynosv4l2 | |
20 | * \author Jinsung Yang (jsgood.yang@samsung.com) | |
21 | * \author Sangwoo Park (sw5771.park@samsung.com) | |
22 | * \date 2012/01/17 | |
23 | * | |
24 | * <b>Revision History: </b> | |
25 | * - 2012/01/17: Jinsung Yang (jsgood.yang@samsung.com) \n | |
26 | * Initial version | |
27 | * | |
28 | */ | |
29 | ||
30 | #include <stdio.h> | |
31 | #include <stdarg.h> | |
32 | #include <stdlib.h> | |
33 | #include <fcntl.h> | |
34 | #include <errno.h> | |
35 | #include <ctype.h> | |
36 | #include <string.h> | |
37 | #include <sys/types.h> | |
38 | #include <sys/ioctl.h> | |
39 | #include <sys/stat.h> | |
40 | #include <media.h> | |
41 | #include <linux/kdev_t.h> | |
42 | #include <linux/types.h> | |
43 | ||
44 | #include "exynos_v4l2.h" | |
45 | ||
46 | //#define LOG_NDEBUG 0 | |
47 | #define LOG_TAG "libexynosv4l2-mc" | |
48 | #include <utils/Log.h> | |
49 | ||
50 | static inline unsigned int __media_entity_type(struct media_entity *entity) | |
51 | { | |
52 | return entity->info.type & MEDIA_ENT_TYPE_MASK; | |
53 | } | |
54 | ||
55 | static void __media_debug_default(void *ptr, ...) | |
56 | { | |
57 | va_list argptr; | |
58 | va_start(argptr, ptr); | |
59 | vprintf((const char*)ptr, argptr); | |
60 | va_end(argptr); | |
61 | } | |
62 | ||
63 | static void __media_debug_set_handler( | |
64 | struct media_device *media, | |
65 | void (*debug_handler)(void *, ...), | |
66 | void *debug_priv) | |
67 | { | |
68 | if (debug_handler) { | |
69 | media->debug_handler = debug_handler; | |
70 | media->debug_priv = debug_priv; | |
71 | } else { | |
72 | media->debug_handler = __media_debug_default; | |
73 | media->debug_priv = NULL; | |
74 | } | |
75 | } | |
76 | ||
77 | static struct media_link *__media_entity_add_link(struct media_entity *entity) | |
78 | { | |
79 | if (entity->num_links >= entity->max_links) { | |
80 | struct media_link *links = entity->links; | |
81 | unsigned int max_links = entity->max_links * 2; | |
82 | unsigned int i; | |
83 | ||
84 | links = (struct media_link*)realloc(links, max_links * sizeof *links); | |
85 | if (links == NULL) | |
86 | return NULL; | |
87 | ||
88 | for (i = 0; i < entity->num_links; ++i) | |
89 | links[i].twin->twin = &links[i]; | |
90 | ||
91 | entity->max_links = max_links; | |
92 | entity->links = links; | |
93 | } | |
94 | ||
95 | return &entity->links[entity->num_links++]; | |
96 | } | |
97 | ||
98 | ||
99 | static int __media_enum_links(struct media_device *media) | |
100 | { | |
7642c64b | 101 | ALOGD("%s: start", __func__); |
e5931c34 JC |
102 | __u32 id; |
103 | int ret = 0; | |
104 | ||
105 | for (id = 1; id <= media->entities_count; id++) { | |
106 | struct media_entity *entity = &media->entities[id - 1]; | |
107 | struct media_links_enum links; | |
108 | unsigned int i; | |
109 | ||
110 | links.entity = entity->info.id; | |
111 | links.pads = (struct media_pad_desc*)malloc(entity->info.pads * sizeof(struct media_pad_desc)); | |
112 | links.links = (struct media_link_desc*)malloc(entity->info.links * sizeof(struct media_link_desc)); | |
113 | ||
114 | if (ioctl(media->fd, MEDIA_IOC_ENUM_LINKS, &links) < 0) { | |
7642c64b | 115 | ALOGE("Unable to enumerate pads and links (%s)", strerror(errno)); |
e5931c34 JC |
116 | free(links.pads); |
117 | free(links.links); | |
118 | return -errno; | |
119 | } | |
120 | ||
121 | for (i = 0; i < entity->info.pads; ++i) { | |
122 | entity->pads[i].entity = entity; | |
123 | entity->pads[i].index = links.pads[i].index; | |
124 | entity->pads[i].flags = links.pads[i].flags; | |
125 | } | |
126 | ||
127 | for (i = 0; i < entity->info.links; ++i) { | |
128 | struct media_link_desc *link = &links.links[i]; | |
129 | struct media_link *fwdlink; | |
130 | struct media_link *backlink; | |
131 | struct media_entity *source; | |
132 | struct media_entity *sink; | |
133 | ||
134 | source = exynos_media_get_entity_by_id(media, link->source.entity); | |
135 | sink = exynos_media_get_entity_by_id(media, link->sink.entity); | |
136 | if (source == NULL || sink == NULL) { | |
7642c64b | 137 | ALOGE("WARNING entity %u link %u from %u/%u to %u/%u is invalid!", |
e5931c34 JC |
138 | id, i, link->source.entity, |
139 | link->source.index, | |
140 | link->sink.entity, | |
141 | link->sink.index); | |
142 | ret = -EINVAL; | |
143 | } else { | |
144 | fwdlink = __media_entity_add_link(source); | |
145 | fwdlink->source = &source->pads[link->source.index]; | |
146 | fwdlink->sink = &sink->pads[link->sink.index]; | |
147 | fwdlink->flags = link->flags; | |
148 | ||
149 | backlink = __media_entity_add_link(sink); | |
150 | backlink->source = &source->pads[link->source.index]; | |
151 | backlink->sink = &sink->pads[link->sink.index]; | |
152 | backlink->flags = link->flags; | |
153 | ||
154 | fwdlink->twin = backlink; | |
155 | backlink->twin = fwdlink; | |
156 | } | |
157 | } | |
158 | ||
159 | free(links.pads); | |
160 | free(links.links); | |
161 | } | |
162 | return ret; | |
163 | } | |
164 | ||
165 | static int __media_get_devname_sysfs(struct media_entity *entity) | |
166 | { | |
167 | //struct stat devstat; | |
168 | char devname[32]; | |
169 | char sysname[32]; | |
170 | char target[1024]; | |
171 | char *p; | |
172 | int ret; | |
173 | ||
174 | sprintf(sysname, "/sys/dev/char/%u:%u", entity->info.v4l.major, | |
175 | entity->info.v4l.minor); | |
176 | ||
177 | ret = readlink(sysname, target, sizeof(target)); | |
178 | if (ret < 0) | |
179 | return -errno; | |
180 | ||
181 | target[ret] = '\0'; | |
182 | p = strrchr(target, '/'); | |
183 | if (p == NULL) | |
184 | return -EINVAL; | |
185 | ||
186 | sprintf(devname, "/tmp/%s", p + 1); | |
187 | ||
188 | ret = mknod(devname, 0666 | S_IFCHR, MKDEV(81, entity->info.v4l.minor)); | |
189 | strcpy(entity->devname, devname); | |
190 | ||
191 | return 0; | |
192 | } | |
193 | ||
194 | static int __media_get_media_fd(const char *filename, struct media_device *media) | |
195 | { | |
196 | ssize_t num; | |
197 | int media_node; | |
198 | char *ptr; | |
199 | char media_buf[6]; | |
200 | ||
7642c64b | 201 | ALOGD("%s: %s", __func__, filename); |
e5931c34 JC |
202 | |
203 | media->fd = open(filename, O_RDWR, 0); | |
204 | if (media->fd < 0) { | |
7642c64b | 205 | ALOGE("Open sysfs media device failed, media->fd: %d", media->fd); |
e5931c34 JC |
206 | return -1; |
207 | } | |
208 | ||
7642c64b | 209 | ALOGD("%s: media->fd: %d", __func__, media->fd); |
e5931c34 JC |
210 | |
211 | return media->fd; | |
212 | ||
213 | } | |
214 | ||
215 | static int __media_enum_entities(struct media_device *media) | |
216 | { | |
d970bdc0 | 217 | struct media_entity *entity, *temp_entity; |
e5931c34 JC |
218 | unsigned int size; |
219 | __u32 id; | |
220 | int ret; | |
d970bdc0 JC |
221 | |
222 | temp_entity = entity = (struct media_entity*)calloc(1, sizeof(struct media_entity)); | |
e5931c34 JC |
223 | for (id = 0, ret = 0; ; id = entity->info.id) { |
224 | size = (media->entities_count + 1) * sizeof(*media->entities); | |
225 | media->entities = (struct media_entity*)realloc(media->entities, size); | |
226 | ||
227 | entity = &media->entities[media->entities_count]; | |
228 | memset(entity, 0, sizeof(*entity)); | |
229 | entity->fd = -1; | |
230 | entity->info.id = id | MEDIA_ENT_ID_FLAG_NEXT; | |
231 | entity->media = media; | |
232 | ||
233 | ret = ioctl(media->fd, MEDIA_IOC_ENUM_ENTITIES, &entity->info); | |
234 | ||
235 | if (ret < 0) { | |
236 | ret = errno != EINVAL ? -errno : 0; | |
237 | break; | |
238 | } | |
239 | ||
240 | /* Number of links (for outbound links) plus number of pads (for | |
241 | * inbound links) is a good safe initial estimate of the total | |
242 | * number of links. | |
243 | */ | |
244 | entity->max_links = entity->info.pads + entity->info.links; | |
245 | ||
246 | entity->pads = (struct media_pad*)malloc(entity->info.pads * sizeof(*entity->pads)); | |
247 | entity->links = (struct media_link*)malloc(entity->max_links * sizeof(*entity->links)); | |
248 | if (entity->pads == NULL || entity->links == NULL) { | |
249 | ret = -ENOMEM; | |
250 | break; | |
251 | } | |
252 | ||
253 | media->entities_count++; | |
254 | ||
255 | /* Find the corresponding device name. */ | |
256 | if (__media_entity_type(entity) != MEDIA_ENT_T_DEVNODE && | |
257 | __media_entity_type(entity) != MEDIA_ENT_T_V4L2_SUBDEV) | |
258 | continue; | |
259 | ||
260 | /* Fall back to get the device name via sysfs */ | |
261 | __media_get_devname_sysfs(entity); | |
262 | if (ret < 0) | |
7642c64b | 263 | ALOGE("media_get_devname failed"); |
e5931c34 | 264 | } |
d970bdc0 | 265 | free(temp_entity); |
e5931c34 JC |
266 | |
267 | return ret; | |
268 | } | |
269 | ||
270 | static struct media_device *__media_open_debug( | |
271 | const char *filename, | |
272 | void (*debug_handler)(void *, ...), | |
273 | void *debug_priv) | |
274 | { | |
275 | struct media_device *media; | |
276 | int ret; | |
277 | ||
278 | media = (struct media_device *)calloc(1, sizeof(struct media_device)); | |
279 | if (media == NULL) { | |
7642c64b | 280 | ALOGE("media: %p", media); |
e5931c34 JC |
281 | return NULL; |
282 | } | |
283 | ||
284 | __media_debug_set_handler(media, debug_handler, debug_priv); | |
285 | ||
7642c64b DZ |
286 | ALOGD("%s: Opening media device %s", __func__, filename); |
287 | ALOGD("%s: media: %p", __func__, media); | |
e5931c34 JC |
288 | |
289 | media->fd = __media_get_media_fd(filename, media); | |
290 | if (media->fd < 0) { | |
291 | exynos_media_close(media); | |
7642c64b | 292 | ALOGE("failed __media_get_media_fd %s", filename); |
e5931c34 JC |
293 | return NULL; |
294 | } | |
295 | ||
7642c64b | 296 | ALOGD("%s: media->fd: %d", __func__, media->fd); |
e5931c34 JC |
297 | ret = __media_enum_entities(media); |
298 | ||
299 | if (ret < 0) { | |
7642c64b | 300 | ALOGE("Unable to enumerate entities for device %s (%s)", filename, strerror(-ret)); |
e5931c34 JC |
301 | exynos_media_close(media); |
302 | return NULL; | |
303 | } | |
304 | ||
7642c64b DZ |
305 | ALOGD("%s: Found %u entities", __func__, media->entities_count); |
306 | ALOGD("%s: Enumerating pads and links", __func__); | |
e5931c34 JC |
307 | |
308 | ret = __media_enum_links(media); | |
309 | if (ret < 0) { | |
7642c64b | 310 | ALOGE("Unable to enumerate pads and links for device %s", filename); |
e5931c34 JC |
311 | exynos_media_close(media); |
312 | return NULL; | |
313 | } | |
314 | ||
315 | return media; | |
316 | } | |
317 | ||
318 | /** | |
319 | * @brief Open a media device. | |
320 | * @param filename - name (including path) of the device node. | |
321 | * | |
322 | * Open the media device referenced by @a filename and enumerate entities, pads and | |
323 | * links. | |
324 | * | |
325 | * @return A pointer to a newly allocated media_device structure instance on | |
326 | * success and NULL on failure. The returned pointer must be freed with | |
327 | * exynos_media_close when the device isn't needed anymore. | |
328 | */ | |
329 | struct media_device *exynos_media_open(const char *filename) | |
330 | { | |
331 | return __media_open_debug(filename, (void (*)(void *, ...))fprintf, stdout); | |
332 | } | |
333 | ||
334 | /** | |
335 | * @brief Close a media device. | |
336 | * @param media - device instance. | |
337 | * | |
338 | * Close the @a media device instance and free allocated resources. Access to the | |
339 | * device instance is forbidden after this function returns. | |
340 | */ | |
341 | void exynos_media_close(struct media_device *media) | |
342 | { | |
343 | unsigned int i; | |
344 | ||
345 | if (media->fd != -1) | |
346 | close(media->fd); | |
347 | ||
348 | for (i = 0; i < media->entities_count; ++i) { | |
349 | struct media_entity *entity = &media->entities[i]; | |
350 | ||
351 | free(entity->pads); | |
352 | free(entity->links); | |
353 | if (entity->fd != -1) | |
354 | close(entity->fd); | |
355 | } | |
356 | ||
357 | free(media->entities); | |
358 | free(media); | |
359 | } | |
360 | ||
361 | /** | |
362 | * @brief Locate the pad at the other end of a link. | |
363 | * @param pad - sink pad at one end of the link. | |
364 | * | |
365 | * Locate the source pad connected to @a pad through an enabled link. As only one | |
366 | * link connected to a sink pad can be enabled at a time, the connected source | |
367 | * pad is guaranteed to be unique. | |
368 | * | |
369 | * @return A pointer to the connected source pad, or NULL if all links connected | |
370 | * to @a pad are disabled. Return NULL also if @a pad is not a sink pad. | |
371 | */ | |
372 | struct media_pad *exynos_media_entity_remote_source(struct media_pad *pad) | |
373 | { | |
374 | unsigned int i; | |
375 | ||
376 | if (!(pad->flags & MEDIA_PAD_FL_SINK)) | |
377 | return NULL; | |
378 | ||
379 | for (i = 0; i < pad->entity->num_links; ++i) { | |
380 | struct media_link *link = &pad->entity->links[i]; | |
381 | ||
382 | if (!(link->flags & MEDIA_LNK_FL_ENABLED)) | |
383 | continue; | |
384 | ||
385 | if (link->sink == pad) | |
386 | return link->source; | |
387 | } | |
388 | ||
389 | return NULL; | |
390 | } | |
391 | ||
392 | /** | |
393 | * @brief Find an entity by its name. | |
394 | * @param media - media device. | |
395 | * @param name - entity name. | |
396 | * @param length - size of @a name. | |
397 | * | |
398 | * Search for an entity with a name equal to @a name. | |
399 | * | |
400 | * @return A pointer to the entity if found, or NULL otherwise. | |
401 | */ | |
402 | struct media_entity *exynos_media_get_entity_by_name(struct media_device *media, | |
403 | const char *name, size_t length) | |
404 | { | |
405 | unsigned int i; | |
406 | struct media_entity *entity; | |
407 | ||
e5931c34 JC |
408 | for (i = 0; i < media->entities_count; ++i) { |
409 | entity = &media->entities[i]; | |
410 | ||
411 | if (strncmp(entity->info.name, name, length) == 0) | |
412 | return entity; | |
413 | } | |
414 | ||
415 | return NULL; | |
416 | } | |
417 | ||
418 | /** | |
419 | * @brief Find an entity by its ID. | |
420 | * @param media - media device. | |
421 | * @param id - entity ID. | |
422 | * | |
423 | * Search for an entity with an ID equal to @a id. | |
424 | * | |
425 | * @return A pointer to the entity if found, or NULL otherwise. | |
426 | */ | |
427 | struct media_entity *exynos_media_get_entity_by_id(struct media_device *media, | |
428 | __u32 id) | |
429 | { | |
430 | unsigned int i; | |
431 | ||
432 | for (i = 0; i < media->entities_count; ++i) { | |
433 | struct media_entity *entity = &media->entities[i]; | |
434 | ||
435 | if (entity->info.id == id) | |
436 | return entity; | |
437 | } | |
438 | ||
439 | return NULL; | |
440 | } | |
441 | ||
442 | /** | |
443 | * @brief Configure a link. | |
444 | * @param media - media device. | |
445 | * @param source - source pad at the link origin. | |
446 | * @param sink - sink pad at the link target. | |
447 | * @param flags - configuration flags. | |
448 | * | |
449 | * Locate the link between @a source and @a sink, and configure it by applying | |
450 | * the new @a flags. | |
451 | * | |
452 | * Only the MEDIA_LINK_FLAG_ENABLED flag is writable. | |
453 | * | |
454 | * @return 0 on success, -1 on failure: | |
455 | * -ENOENT: link not found | |
456 | * - other error codes returned by MEDIA_IOC_SETUP_LINK | |
457 | */ | |
458 | int exynos_media_setup_link(struct media_device *media, | |
459 | struct media_pad *source, | |
460 | struct media_pad *sink, | |
461 | __u32 flags) | |
462 | { | |
463 | struct media_link *link; | |
464 | struct media_link_desc ulink; | |
465 | unsigned int i; | |
466 | int ret; | |
467 | ||
468 | for (i = 0; i < source->entity->num_links; i++) { | |
469 | link = &source->entity->links[i]; | |
470 | ||
471 | if (link->source->entity == source->entity && | |
472 | link->source->index == source->index && | |
473 | link->sink->entity == sink->entity && | |
474 | link->sink->index == sink->index) | |
475 | break; | |
476 | } | |
477 | ||
478 | if (i == source->entity->num_links) { | |
7642c64b | 479 | ALOGE("Link not found"); |
e5931c34 JC |
480 | return -ENOENT; |
481 | } | |
482 | ||
483 | /* source pad */ | |
484 | ulink.source.entity = source->entity->info.id; | |
485 | ulink.source.index = source->index; | |
486 | ulink.source.flags = MEDIA_PAD_FL_SOURCE; | |
487 | ||
488 | /* sink pad */ | |
489 | ulink.sink.entity = sink->entity->info.id; | |
490 | ulink.sink.index = sink->index; | |
491 | ulink.sink.flags = MEDIA_PAD_FL_SINK; | |
492 | ||
493 | ulink.flags = flags | (link->flags & MEDIA_LNK_FL_IMMUTABLE); | |
494 | ||
495 | ret = ioctl(media->fd, MEDIA_IOC_SETUP_LINK, &ulink); | |
496 | if (ret == -1) { | |
7642c64b | 497 | ALOGE("Unable to setup link (%s)", strerror(errno)); |
e5931c34 JC |
498 | return -errno; |
499 | } | |
500 | ||
501 | link->flags = ulink.flags; | |
502 | link->twin->flags = ulink.flags; | |
503 | return 0; | |
504 | } | |
505 | ||
506 | /** | |
507 | * @brief Reset all links to the disabled state. | |
508 | * @param media - media device. | |
509 | * | |
510 | * Disable all links in the media device. This function is usually used after | |
511 | * opening a media device to reset all links to a known state. | |
512 | * | |
513 | * @return 0 on success, or a negative error code on failure. | |
514 | */ | |
515 | int exynos_media_reset_links(struct media_device *media) | |
516 | { | |
517 | unsigned int i, j; | |
518 | int ret; | |
519 | ||
520 | for (i = 0; i < media->entities_count; ++i) { | |
521 | struct media_entity *entity = &media->entities[i]; | |
522 | ||
523 | for (j = 0; j < entity->num_links; j++) { | |
524 | struct media_link *link = &entity->links[j]; | |
525 | ||
526 | if (link->flags & MEDIA_LNK_FL_IMMUTABLE || | |
527 | link->source->entity != entity) | |
528 | continue; | |
529 | ||
530 | ret = exynos_media_setup_link(media, link->source, link->sink, | |
531 | link->flags & ~MEDIA_LNK_FL_ENABLED); | |
532 | if (ret < 0) | |
533 | return ret; | |
534 | } | |
535 | } | |
536 | ||
537 | return 0; | |
538 | } | |
539 | ||
540 | #ifdef HAVE_LIBUDEV | |
541 | ||
542 | #include <libudev.h> | |
543 | ||
544 | static inline int __media_udev_open(struct udev **udev) | |
545 | { | |
546 | *udev = udev_new(); | |
547 | if (*udev == NULL) | |
548 | return -ENOMEM; | |
549 | return 0; | |
550 | } | |
551 | ||
552 | static inline void __media_udev_close(struct udev *udev) | |
553 | { | |
554 | if (udev != NULL) | |
555 | udev_unref(udev); | |
556 | } | |
557 | ||
558 | static int __media_get_devname_udev(struct udev *udev, | |
559 | struct media_entity *entity) | |
560 | { | |
561 | struct udev_device *device; | |
562 | dev_t devnum; | |
563 | const char *p; | |
564 | int ret = -ENODEV; | |
565 | ||
566 | if (udev == NULL) | |
567 | return -EINVAL; | |
568 | ||
569 | devnum = makedev(entity->info.v4l.major, entity->info.v4l.minor); | |
7642c64b | 570 | ALOGE("looking up device: %u:%u", |
e5931c34 JC |
571 | major(devnum), minor(devnum)); |
572 | device = udev_device_new_from_devnum(udev, 'c', devnum); | |
573 | if (device) { | |
574 | p = udev_device_get_devnode(device); | |
575 | if (p) { | |
576 | strncpy(entity->devname, p, sizeof(entity->devname)); | |
577 | entity->devname[sizeof(entity->devname) - 1] = '\0'; | |
578 | } | |
579 | ret = 0; | |
580 | } | |
581 | ||
582 | udev_device_unref(device); | |
583 | ||
584 | return ret; | |
585 | } | |
586 | ||
587 | #else /* HAVE_LIBUDEV */ | |
588 | ||
589 | struct udev; | |
590 | ||
591 | static inline int __media_udev_open(struct udev **udev) { return 0; } | |
592 | ||
593 | static inline void __media_udev_close(struct udev *udev) { } | |
594 | ||
595 | static inline int __media_get_devname_udev(struct udev *udev, | |
596 | struct media_entity *entity) | |
597 | { | |
598 | return -ENOTSUP; | |
599 | } | |
600 | ||
601 | #endif /* HAVE_LIBUDEV */ | |
602 | ||
603 | /** | |
604 | * @brief Parse string to a pad on the media device. | |
605 | * @param media - media device. | |
606 | * @param p - input string | |
607 | * @param endp - pointer to string where parsing ended | |
608 | * | |
609 | * Parse NULL terminated string describing a pad and return its struct | |
610 | * media_pad instance. | |
611 | * | |
612 | * @return Pointer to struct media_pad on success, NULL on failure. | |
613 | */ | |
614 | struct media_pad *exynos_media_parse_pad(struct media_device *media, | |
615 | const char *p, char **endp) | |
616 | { | |
617 | unsigned int entity_id, pad; | |
618 | struct media_entity *entity; | |
619 | char *end; | |
620 | ||
621 | for (; isspace(*p); ++p); | |
622 | ||
623 | if (*p == '"') { | |
624 | for (end = (char *)p + 1; *end && *end != '"'; ++end); | |
625 | if (*end != '"') | |
626 | return NULL; | |
627 | ||
628 | entity = exynos_media_get_entity_by_name(media, p + 1, end - p - 1); | |
629 | if (entity == NULL) | |
630 | return NULL; | |
631 | ||
632 | ++end; | |
633 | } else { | |
634 | entity_id = strtoul(p, &end, 10); | |
635 | entity = exynos_media_get_entity_by_id(media, entity_id); | |
636 | if (entity == NULL) | |
637 | return NULL; | |
638 | } | |
639 | for (; isspace(*end); ++end); | |
640 | ||
641 | if (*end != ':') | |
642 | return NULL; | |
643 | for (p = end + 1; isspace(*p); ++p); | |
644 | ||
645 | pad = strtoul(p, &end, 10); | |
646 | for (p = end; isspace(*p); ++p); | |
647 | ||
648 | if (pad >= entity->info.pads) | |
649 | return NULL; | |
650 | ||
651 | for (p = end; isspace(*p); ++p); | |
652 | if (endp) | |
653 | *endp = (char *)p; | |
654 | ||
655 | return &entity->pads[pad]; | |
656 | } | |
657 | ||
658 | /** | |
659 | * @brief Parse string to a link on the media device. | |
660 | * @param media - media device. | |
661 | * @param p - input string | |
662 | * @param endp - pointer to p where parsing ended | |
663 | * | |
664 | * Parse NULL terminated string p describing a link and return its struct | |
665 | * media_link instance. | |
666 | * | |
667 | * @return Pointer to struct media_link on success, NULL on failure. | |
668 | */ | |
669 | struct media_link *exynos_media_parse_link( | |
670 | struct media_device *media, | |
671 | const char *p, | |
672 | char **endp) | |
673 | { | |
674 | struct media_link *link; | |
675 | struct media_pad *source; | |
676 | struct media_pad *sink; | |
677 | unsigned int i; | |
678 | char *end; | |
679 | ||
680 | source = exynos_media_parse_pad(media, p, &end); | |
681 | if (source == NULL) | |
682 | return NULL; | |
683 | ||
684 | if (end[0] != '-' || end[1] != '>') | |
685 | return NULL; | |
686 | p = end + 2; | |
687 | ||
688 | sink = exynos_media_parse_pad(media, p, &end); | |
689 | if (sink == NULL) | |
690 | return NULL; | |
691 | ||
692 | *endp = end; | |
693 | ||
694 | for (i = 0; i < source->entity->num_links; i++) { | |
695 | link = &source->entity->links[i]; | |
696 | ||
697 | if (link->source == source && link->sink == sink) | |
698 | return link; | |
699 | } | |
700 | ||
701 | return NULL; | |
702 | } | |
703 | ||
704 | /** | |
705 | * @brief Parse string to a link on the media device and set it up. | |
706 | * @param media - media device. | |
707 | * @param p - input string | |
708 | * | |
709 | * Parse NULL terminated string p describing a link and its configuration | |
710 | * and configure the link. | |
711 | * | |
712 | * @return 0 on success, or a negative error code on failure. | |
713 | */ | |
714 | int exynos_media_parse_setup_link( | |
715 | struct media_device *media, | |
716 | const char *p, | |
717 | char **endp) | |
718 | { | |
719 | struct media_link *link; | |
720 | __u32 flags; | |
721 | char *end; | |
722 | ||
723 | link = exynos_media_parse_link(media, p, &end); | |
724 | if (link == NULL) { | |
7642c64b | 725 | ALOGE("Unable to parse link"); |
e5931c34 JC |
726 | return -EINVAL; |
727 | } | |
728 | ||
729 | p = end; | |
730 | if (*p++ != '[') { | |
7642c64b | 731 | ALOGE("Unable to parse link flags"); |
e5931c34 JC |
732 | return -EINVAL; |
733 | } | |
734 | ||
735 | flags = strtoul(p, &end, 10); | |
736 | for (p = end; isspace(*p); p++); | |
737 | if (*p++ != ']') { | |
7642c64b | 738 | ALOGE("Unable to parse link flags"); |
e5931c34 JC |
739 | return -EINVAL; |
740 | } | |
741 | ||
742 | for (; isspace(*p); p++); | |
743 | *endp = (char *)p; | |
744 | ||
7642c64b | 745 | ALOGD("%s: Setting up link %u:%u -> %u:%u [%u]", __func__, |
e5931c34 JC |
746 | link->source->entity->info.id, link->source->index, |
747 | link->sink->entity->info.id, link->sink->index, | |
748 | flags); | |
749 | ||
750 | return exynos_media_setup_link(media, link->source, link->sink, flags); | |
751 | } | |
752 | ||
753 | /** | |
754 | * @brief Parse string to link(s) on the media device and set it up. | |
755 | * @param media - media device. | |
756 | * @param p - input string | |
757 | * | |
758 | * Parse NULL terminated string p describing link(s) separated by | |
759 | * commas (,) and configure the link(s). | |
760 | * | |
761 | * @return 0 on success, or a negative error code on failure. | |
762 | */ | |
763 | int exynos_media_parse_setup_links(struct media_device *media, const char *p) | |
764 | { | |
765 | char *end; | |
766 | int ret; | |
767 | ||
768 | do { | |
769 | ret = exynos_media_parse_setup_link(media, p, &end); | |
770 | if (ret < 0) | |
771 | return ret; | |
772 | ||
773 | p = end + 1; | |
774 | } while (*end == ','); | |
775 | ||
776 | return *end ? -EINVAL : 0; | |
777 | } |