Jiho Chang | e5931c3 | 2012-03-24 05:59:38 +0900 | [diff] [blame] | 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 | { |
Dima Zavin | 7642c64 | 2012-04-02 23:45:46 -0700 | [diff] [blame] | 101 | ALOGD("%s: start", __func__); |
Jiho Chang | e5931c3 | 2012-03-24 05:59:38 +0900 | [diff] [blame] | 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) { |
Dima Zavin | 7642c64 | 2012-04-02 23:45:46 -0700 | [diff] [blame] | 115 | ALOGE("Unable to enumerate pads and links (%s)", strerror(errno)); |
Jiho Chang | e5931c3 | 2012-03-24 05:59:38 +0900 | [diff] [blame] | 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) { |
Dima Zavin | 7642c64 | 2012-04-02 23:45:46 -0700 | [diff] [blame] | 137 | ALOGE("WARNING entity %u link %u from %u/%u to %u/%u is invalid!", |
Jiho Chang | e5931c3 | 2012-03-24 05:59:38 +0900 | [diff] [blame] | 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 | |
Dima Zavin | 7642c64 | 2012-04-02 23:45:46 -0700 | [diff] [blame] | 201 | ALOGD("%s: %s", __func__, filename); |
Jiho Chang | e5931c3 | 2012-03-24 05:59:38 +0900 | [diff] [blame] | 202 | |
| 203 | media->fd = open(filename, O_RDWR, 0); |
| 204 | if (media->fd < 0) { |
Dima Zavin | 7642c64 | 2012-04-02 23:45:46 -0700 | [diff] [blame] | 205 | ALOGE("Open sysfs media device failed, media->fd: %d", media->fd); |
Jiho Chang | e5931c3 | 2012-03-24 05:59:38 +0900 | [diff] [blame] | 206 | return -1; |
| 207 | } |
| 208 | |
Dima Zavin | 7642c64 | 2012-04-02 23:45:46 -0700 | [diff] [blame] | 209 | ALOGD("%s: media->fd: %d", __func__, media->fd); |
Jiho Chang | e5931c3 | 2012-03-24 05:59:38 +0900 | [diff] [blame] | 210 | |
| 211 | return media->fd; |
| 212 | |
| 213 | } |
| 214 | |
| 215 | static int __media_enum_entities(struct media_device *media) |
| 216 | { |
Jiho Chang | d970bdc | 2012-04-26 15:55:33 -0700 | [diff] [blame] | 217 | struct media_entity *entity, *temp_entity; |
Jiho Chang | e5931c3 | 2012-03-24 05:59:38 +0900 | [diff] [blame] | 218 | unsigned int size; |
| 219 | __u32 id; |
| 220 | int ret; |
Jiho Chang | d970bdc | 2012-04-26 15:55:33 -0700 | [diff] [blame] | 221 | |
| 222 | temp_entity = entity = (struct media_entity*)calloc(1, sizeof(struct media_entity)); |
Jiho Chang | e5931c3 | 2012-03-24 05:59:38 +0900 | [diff] [blame] | 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) |
Dima Zavin | 7642c64 | 2012-04-02 23:45:46 -0700 | [diff] [blame] | 263 | ALOGE("media_get_devname failed"); |
Jiho Chang | e5931c3 | 2012-03-24 05:59:38 +0900 | [diff] [blame] | 264 | } |
Jiho Chang | d970bdc | 2012-04-26 15:55:33 -0700 | [diff] [blame] | 265 | free(temp_entity); |
Jiho Chang | e5931c3 | 2012-03-24 05:59:38 +0900 | [diff] [blame] | 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) { |
Dima Zavin | 7642c64 | 2012-04-02 23:45:46 -0700 | [diff] [blame] | 280 | ALOGE("media: %p", media); |
Jiho Chang | e5931c3 | 2012-03-24 05:59:38 +0900 | [diff] [blame] | 281 | return NULL; |
| 282 | } |
| 283 | |
| 284 | __media_debug_set_handler(media, debug_handler, debug_priv); |
| 285 | |
Dima Zavin | 7642c64 | 2012-04-02 23:45:46 -0700 | [diff] [blame] | 286 | ALOGD("%s: Opening media device %s", __func__, filename); |
| 287 | ALOGD("%s: media: %p", __func__, media); |
Jiho Chang | e5931c3 | 2012-03-24 05:59:38 +0900 | [diff] [blame] | 288 | |
| 289 | media->fd = __media_get_media_fd(filename, media); |
| 290 | if (media->fd < 0) { |
| 291 | exynos_media_close(media); |
Dima Zavin | 7642c64 | 2012-04-02 23:45:46 -0700 | [diff] [blame] | 292 | ALOGE("failed __media_get_media_fd %s", filename); |
Jiho Chang | e5931c3 | 2012-03-24 05:59:38 +0900 | [diff] [blame] | 293 | return NULL; |
| 294 | } |
| 295 | |
Dima Zavin | 7642c64 | 2012-04-02 23:45:46 -0700 | [diff] [blame] | 296 | ALOGD("%s: media->fd: %d", __func__, media->fd); |
Jiho Chang | e5931c3 | 2012-03-24 05:59:38 +0900 | [diff] [blame] | 297 | ret = __media_enum_entities(media); |
| 298 | |
| 299 | if (ret < 0) { |
Dima Zavin | 7642c64 | 2012-04-02 23:45:46 -0700 | [diff] [blame] | 300 | ALOGE("Unable to enumerate entities for device %s (%s)", filename, strerror(-ret)); |
Jiho Chang | e5931c3 | 2012-03-24 05:59:38 +0900 | [diff] [blame] | 301 | exynos_media_close(media); |
| 302 | return NULL; |
| 303 | } |
| 304 | |
Dima Zavin | 7642c64 | 2012-04-02 23:45:46 -0700 | [diff] [blame] | 305 | ALOGD("%s: Found %u entities", __func__, media->entities_count); |
| 306 | ALOGD("%s: Enumerating pads and links", __func__); |
Jiho Chang | e5931c3 | 2012-03-24 05:59:38 +0900 | [diff] [blame] | 307 | |
| 308 | ret = __media_enum_links(media); |
| 309 | if (ret < 0) { |
Dima Zavin | 7642c64 | 2012-04-02 23:45:46 -0700 | [diff] [blame] | 310 | ALOGE("Unable to enumerate pads and links for device %s", filename); |
Jiho Chang | e5931c3 | 2012-03-24 05:59:38 +0900 | [diff] [blame] | 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 | |
Jiho Chang | e5931c3 | 2012-03-24 05:59:38 +0900 | [diff] [blame] | 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) { |
Dima Zavin | 7642c64 | 2012-04-02 23:45:46 -0700 | [diff] [blame] | 479 | ALOGE("Link not found"); |
Jiho Chang | e5931c3 | 2012-03-24 05:59:38 +0900 | [diff] [blame] | 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) { |
Dima Zavin | 7642c64 | 2012-04-02 23:45:46 -0700 | [diff] [blame] | 497 | ALOGE("Unable to setup link (%s)", strerror(errno)); |
Jiho Chang | e5931c3 | 2012-03-24 05:59:38 +0900 | [diff] [blame] | 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); |
Dima Zavin | 7642c64 | 2012-04-02 23:45:46 -0700 | [diff] [blame] | 570 | ALOGE("looking up device: %u:%u", |
Jiho Chang | e5931c3 | 2012-03-24 05:59:38 +0900 | [diff] [blame] | 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) { |
Dima Zavin | 7642c64 | 2012-04-02 23:45:46 -0700 | [diff] [blame] | 725 | ALOGE("Unable to parse link"); |
Jiho Chang | e5931c3 | 2012-03-24 05:59:38 +0900 | [diff] [blame] | 726 | return -EINVAL; |
| 727 | } |
| 728 | |
| 729 | p = end; |
| 730 | if (*p++ != '[') { |
Dima Zavin | 7642c64 | 2012-04-02 23:45:46 -0700 | [diff] [blame] | 731 | ALOGE("Unable to parse link flags"); |
Jiho Chang | e5931c3 | 2012-03-24 05:59:38 +0900 | [diff] [blame] | 732 | return -EINVAL; |
| 733 | } |
| 734 | |
| 735 | flags = strtoul(p, &end, 10); |
| 736 | for (p = end; isspace(*p); p++); |
| 737 | if (*p++ != ']') { |
Dima Zavin | 7642c64 | 2012-04-02 23:45:46 -0700 | [diff] [blame] | 738 | ALOGE("Unable to parse link flags"); |
Jiho Chang | e5931c3 | 2012-03-24 05:59:38 +0900 | [diff] [blame] | 739 | return -EINVAL; |
| 740 | } |
| 741 | |
| 742 | for (; isspace(*p); p++); |
| 743 | *endp = (char *)p; |
| 744 | |
Dima Zavin | 7642c64 | 2012-04-02 23:45:46 -0700 | [diff] [blame] | 745 | ALOGD("%s: Setting up link %u:%u -> %u:%u [%u]", __func__, |
Jiho Chang | e5931c3 | 2012-03-24 05:59:38 +0900 | [diff] [blame] | 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 | } |