media.c

   1 /*
   2  * Media controller test application
   3  *
   4  * Copyright (C) 2010 Ideas on board SPRL <laurent.pinchart@ideasonboard.com>
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation; either version 2 of the License, or
   9  * (at your option) any later version.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License along
  17  * with this program; if not, write to the Free Software Foundation, Inc.,
  18  */
  19
  20 #include <sys/ioctl.h>
  21 #include <sys/stat.h>
  22 #include <sys/types.h>
  23
  24 #include <unistd.h>
  25 #include <stdio.h>
  26 #include <stdlib.h>
  27 #include <string.h>
  28 #include <fcntl.h>
  29 #include <errno.h>
  30
  31 #include <linux/videodev2.h>
  32 #include <linux/media.h>
  33
  34 #include "media.h"
  35 #include "subdev.h"
  36 #include "tools.h"
  37
  38 static const char *media_entity_type_to_string(unsigned type)
  39 {
  40         static const struct {
  41                 __u32 type;
  42                 const char *name;
  43         } types[] = {
  44                 { MEDIA_ENTITY_TYPE_NODE, "Node" },
  45                 { MEDIA_ENTITY_TYPE_SUBDEV, "V4L2 subdev" },
  46         };
  47
  48         unsigned int i;
  49
  50         for (i = 0; i < ARRAY_SIZE(types); i++) {
  51                 if (types[i].type == type)
  52                         return types[i].name;
  53         }
  54
  55         return "Unknown";
  56 }
  57
  58 static const char *media_entity_subtype_to_string(unsigned type, unsigned subtype)
  59 {
  60         static const char *node_types[] = {
  61                 "Unknown",
  62                 "V4L",
  63                 "FB",
  64                 "ALSA",
  65                 "DVB",
  66         };
  67         static const char *subdev_types[] = {
  68                 "Unknown",
  69                 "Video Decoder",
  70                 "Video Encoder",
  71                 "Miscellaneous",
  72         };
  73
  74         switch (type) {
  75         case MEDIA_ENTITY_TYPE_NODE:
  76                 if (subtype > 4)
  77                         subtype = 0;
  78                 return node_types[subtype];
  79
  80         case MEDIA_ENTITY_TYPE_SUBDEV:
  81                 if (subtype > 3)
  82                         subtype = 0;
  83                 return subdev_types[subtype];
  84         default:
  85                 return node_types[0];
  86         }
  87 }
  88
  89 static const char *media_pad_type_to_string(unsigned type)
  90 {
  91         static const struct {
  92                 __u32 type;
  93                 const char *name;
  94         } types[] = {
  95                 { MEDIA_PAD_TYPE_INPUT, "Input" },
  96                 { MEDIA_PAD_TYPE_OUTPUT, "Output" },
  97         };
  98
  99         unsigned int i;
 100
 101         for (i = 0; i < ARRAY_SIZE(types); i++) {
 102                 if (types[i].type == type)
 103                         return types[i].name;
 104         }
 105
 106         return "Unknown";
 107 }
 108
 109 /*
 110  * media_entity_remote_pad -
 111  */
 112 struct media_entity_pad *media_entity_remote_pad(struct media_entity_pad *pad)
 113 {
 114         unsigned int i;
 115
 116         for (i = 0; i < pad->entity->info.links; ++i) {
 117                 struct media_entity_link *link = &pad->entity->links[i];
 118
 119                 if (!(link->flags & MEDIA_LINK_FLAG_ACTIVE))
 120                         continue;
 121
 122                 if (link->source == pad)
 123                         return link->sink;
 124
 125                 if (link->sink == pad)
 126                         return link->source;
 127         }
 128
 129         return NULL;
 130 }
 131
 132 /*
 133  * media_get_entity_by_name -
 134  */
 135 struct media_entity *media_get_entity_by_name(struct media_device *media,
 136                                               const char *name, size_t length)
 137 {
 138         unsigned int i;
 139
 140         for (i = 0; i < media->entities_count; ++i) {
 141                 struct media_entity *entity = &media->entities[i];
 142
 143                 if (strncmp(entity->info.name, name, length) == 0)
 144                         return entity;
 145         }
 146
 147         return NULL;
 148 }
 149
 150 /*
 151  * media_get_entity_by_id -
 152  */
 153 struct media_entity *media_get_entity_by_id(struct media_device *media,
 154                                             __u32 id)
 155 {
 156         unsigned int i;
 157
 158         for (i = 0; i < media->entities_count; ++i) {
 159                 struct media_entity *entity = &media->entities[i];
 160
 161                 if (entity->info.id == id)
 162                         return entity;
 163         }
 164
 165         return NULL;
 166 }
 167
 168 /*
 169  * media_setup_link -
 170  */
 171 int media_setup_link(struct media_device *media,
 172                      struct media_entity_pad *source,
 173                      struct media_entity_pad *sink,
 174                      __u32 flags)
 175 {
 176         struct media_entity_link *link;
 177         struct media_user_link ulink;
 178         unsigned int i;
 179         int ret;
 180
 181         for (i = 0; i < source->entity->info.links; i++) {
 182                 link = &source->entity->links[i];
 183
 184                 if (link->source->entity == source->entity &&
 185                     link->source->index == source->index &&
 186                     link->sink->entity == sink->entity &&
 187                     link->sink->index == sink->index)
 188                         break;
 189         }
 190
 191         if (i == source->entity->info.links) {
 192                 printf("%s: Link not found\n", __func__);
 193                 return -EINVAL;
 194         }
 195
 196         /* source pad */
 197         ulink.source.entity = source->entity->info.id;
 198         ulink.source.index = source->index;
 199         ulink.source.type = MEDIA_PAD_TYPE_OUTPUT;
 200
 201         /* sink pad */
 202         ulink.sink.entity = sink->entity->info.id;
 203         ulink.sink.index = sink->index;
 204         ulink.sink.type = MEDIA_PAD_TYPE_INPUT;
 205
 206         ulink.flags = flags | (link->flags & MEDIA_LINK_FLAG_IMMUTABLE);
 207
 208         ret = ioctl(media->fd, MEDIA_IOC_SETUP_LINK, &ulink);
 209         if (ret < 0) {
 210                 printf("%s: Unable to setup link (%s)\n", __func__,
 211                         strerror(errno));
 212                 return ret;
 213         }
 214
 215         link->flags = flags;
 216         return 0;
 217 }
 218
 219 int media_reset_links(struct media_device *media)
 220 {
 221         unsigned int i, j;
 222         int ret;
 223
 224         for (i = 0; i < media->entities_count; ++i) {
 225                 struct media_entity *entity = &media->entities[i];
 226
 227                 for (j = 0; j < entity->info.links; j++) {
 228                         struct media_entity_link *link = &entity->links[j];
 229
 230                         if (link->flags & MEDIA_LINK_FLAG_IMMUTABLE)
 231                                 continue;
 232
 233                         ret = media_setup_link(media, link->source, link->sink,
 234                                                link->flags & ~MEDIA_LINK_FLAG_ACTIVE);
 235                         if (ret < 0)
 236                                 return ret;
 237                 }
 238         }
 239
 240         return 0;
 241 }
 242
 243 static void media_print_topology_dot(struct media_device *media)
 244 {
 245         unsigned int i, j;
 246
 247         printf("digraph board {\n");
 248         printf("\trankdir=TB\n");
 249
 250         for (i = 0; i < media->entities_count; ++i) {
 251                 struct media_entity *entity = &media->entities[i];
 252                 unsigned int npads;
 253
 254                 switch (entity->info.type) {
 255                 case MEDIA_ENTITY_TYPE_NODE:
 256                         printf("\tn%08x [label=\"%s\\n%s\", shape=box, style=filled, "
 257                                "fillcolor=yellow]\n",
 258                                entity->info.id, entity->info.name, entity->devname);
 259                         break;
 260
 261                 case MEDIA_ENTITY_TYPE_SUBDEV:
 262                         printf("\tn%08x [label=\"{{", entity->info.id);
 263
 264                         for (j = 0, npads = 0; j < entity->info.pads; ++j) {
 265                                 if (entity->pads[j].type != MEDIA_PAD_TYPE_INPUT)
 266                                         continue;
 267
 268                                 printf("%s<port%u> %u", npads ? " | " : "", j, j);
 269                                 npads++;
 270                         }
 271
 272                         printf("} | %s", entity->info.name);
 273                         if (entity->devname)
 274                                 printf("\\n%s", entity->devname);
 275                         printf(" | {");
 276
 277                         for (j = 0, npads = 0; j < entity->info.pads; ++j) {
 278                                 if (entity->pads[j].type != MEDIA_PAD_TYPE_OUTPUT)
 279                                         continue;
 280
 281                                 printf("%s<port%u> %u", npads ? " | " : "", j, j);
 282                                 npads++;
 283                         }
 284
 285                         printf("}}\", shape=Mrecord, style=filled, fillcolor=green]\n");
 286                         break;
 287
 288                 default:
 289                         continue;
 290                 }
 291
 292                 for (j = 0; j < entity->info.links; j++) {
 293                         struct media_entity_link *link = &entity->links[j];
 294
 295                         if (link->source->entity != entity)
 296                                 continue;
 297
 298                         printf("\tn%08x", link->source->entity->info.id);
 299                         if (link->source->entity->info.type == MEDIA_ENTITY_TYPE_SUBDEV)
 300                                 printf(":port%u", link->source->index);
 301                         printf(" -> ");
 302                         printf("n%08x", link->sink->entity->info.id);
 303                         if (link->sink->entity->info.type == MEDIA_ENTITY_TYPE_SUBDEV)
 304                                 printf(":port%u", link->sink->index);
 305
 306                         if (link->flags & MEDIA_LINK_FLAG_IMMUTABLE)
 307                                 printf(" [style=bold]");
 308                         else if (!(link->flags & MEDIA_LINK_FLAG_ACTIVE))
 309                                 printf(" [style=dashed]");
 310                         printf("\n");
 311                 }
 312         }
 313
 314         printf("}\n");
 315 }
 316
 317 static void media_print_topology_text(struct media_device *media)
 318 {
 319         unsigned int i, j, k;
 320         unsigned int padding;
 321
 322         printf("Device topology\n");
 323
 324         for (i = 0; i < media->entities_count; ++i) {
 325                 struct media_entity *entity = &media->entities[i];
 326
 327                 padding = printf("- entity %u: ", entity->info.id);
 328                 printf("%s (%u pad%s, %u link%s)\n", entity->info.name,
 329                         entity->info.pads, entity->info.pads > 1 ? "s" : "",
 330                         entity->info.links, entity->info.links > 1 ? "s" : "");
 331                 printf("%*ctype %s subtype %s\n", padding, ' ',
 332                         media_entity_type_to_string(entity->info.type),
 333                         media_entity_subtype_to_string(entity->info.type, entity->info.subtype));
 334                 if (entity->devname[0])
 335                         printf("%*cdevice node name %s\n", padding, ' ', entity->devname);
 336
 337                 for (j = 0; j < entity->info.pads; j++) {
 338                         struct media_entity_pad *pad = &entity->pads[j];
 339
 340                         printf("\tpad%u: %s ", j, media_pad_type_to_string(pad->type));
 341
 342                         if (entity->info.type == MEDIA_ENTITY_TYPE_SUBDEV)
 343                                 v4l2_subdev_print_format(entity, j, V4L2_SUBDEV_FORMAT_ACTIVE);
 344
 345                         printf("\n");
 346
 347                         for (k = 0; k < entity->info.links; k++) {
 348                                 struct media_entity_link *link = &entity->links[k];
 349
 350                                 if (link->source->entity != entity ||
 351                                     link->source->index != j)
 352                                         continue;
 353
 354                                 printf("\t\t-> '%s':pad%u [",
 355                                         link->sink->entity->info.name, link->sink->index);
 356
 357                                 if (link->flags & MEDIA_LINK_FLAG_IMMUTABLE)
 358                                         printf("IMMUTABLE,");
 359                                 if (link->flags & MEDIA_LINK_FLAG_ACTIVE)
 360                                         printf("ACTIVE");
 361
 362                                 printf("]\n");
 363                         }
 364                 }
 365                 printf("\n");
 366         }
 367 }
 368
 369 void media_print_topology(struct media_device *media, int dot)
 370 {
 371         if (dot)
 372                 media_print_topology_dot(media);
 373         else
 374                 media_print_topology_text(media);
 375 }
 376
 377 static int media_enum_links(struct media_device *media)
 378 {
 379         __u32 id;
 380         int ret = 0;
 381
 382         for (id = 1; id <= media->entities_count; id++) {
 383                 struct media_entity *entity = &media->entities[id - 1];
 384                 struct media_user_links links;
 385                 unsigned int i;
 386
 387                 links.entity = entity->info.id;
 388                 links.pads = malloc(entity->info.pads * sizeof(struct media_user_pad));
 389                 links.links = malloc(entity->info.links * sizeof(struct media_user_link));
 390
 391                 if (ioctl(media->fd, MEDIA_IOC_ENUM_LINKS, &links) < 0) {
 392                         printf("%s: Unable to enumerate pads and links (%s).\n",
 393                                 __func__, strerror(errno));
 394                         free(links.pads);
 395                         free(links.links);
 396                         return -errno;
 397                 }
 398
 399                 for (i = 0; i < entity->info.pads; ++i) {
 400                         entity->pads[i].entity = entity;
 401                         entity->pads[i].type = links.pads[i].type;
 402                         entity->pads[i].index = links.pads[i].index;
 403                 }
 404
 405                 for (i = 0; i < entity->info.links; ++i) {
 406                         struct media_user_link *link = &links.links[i];
 407                         struct media_entity *source;
 408                         struct media_entity *sink;
 409
 410                         source = media_get_entity_by_id(media, link->source.entity);
 411                         sink = media_get_entity_by_id(media, link->sink.entity);
 412
 413                         if (source == NULL || sink == NULL) {
 414                                 printf("WARNING entity %u link %u from %u/%u to %u/%u is invalid!\n",
 415                                         id, i, link->source.entity, link->source.index,
 416                                         link->sink.entity, link->sink.index);
 417                                 ret = -EINVAL;
 418                         }
 419
 420                         entity->links[i].source = &source->pads[link->source.index];
 421                         entity->links[i].sink = &sink->pads[link->sink.index];
 422                         entity->links[i].flags = links.links[i].flags;
 423                 }
 424
 425                 free(links.pads);
 426                 free(links.links);
 427         }
 428
 429         return ret;
 430 }
 431
 432 static int media_enum_entities(struct media_device *media)
 433 {
 434         struct media_entity *entity;
 435         struct stat devstat;
 436         unsigned int size;
 437         char devname[32];
 438         char sysname[32];
 439         char target[1024];
 440         char *p;
 441         __u32 id;
 442         int ret;
 443
 444         for (id = 0; ; id = entity->info.id) {
 445                 size = (media->entities_count + 1) * sizeof(*media->entities);
 446                 media->entities = realloc(media->entities, size);
 447
 448                 entity = &media->entities[media->entities_count];
 449                 memset(entity, 0, sizeof(*entity));
 450                 entity->fd = -1;
 451                 entity->info.id = id | MEDIA_ENTITY_ID_FLAG_NEXT;
 452
 453                 ret = ioctl(media->fd, MEDIA_IOC_ENUM_ENTITIES, &entity->info);
 454                 if (ret < 0) {
 455                         if (errno == EINVAL)
 456                                 break;
 457                         return -errno;
 458                 }
 459
 460                 entity->pads = malloc(entity->info.pads * sizeof(*entity->pads));
 461                 entity->links = malloc(entity->info.links * sizeof(*entity->links));
 462                 if (entity->pads == NULL || entity->links == NULL)
 463                         return -ENOMEM;
 464
 465                 media->entities_count++;
 466
 467                 /* Find the corresponding device name. */
 468                 if ((entity->info.type != MEDIA_ENTITY_TYPE_NODE ||
 469                      entity->info.type != MEDIA_NODE_TYPE_V4L) &&
 470                     (entity->info.type != MEDIA_ENTITY_TYPE_SUBDEV))
 471                         continue;
 472
 473                 sprintf(sysname, "/sys/dev/char/%u:%u", entity->info.v4l.major,
 474                         entity->info.v4l.minor);
 475                 ret = readlink(sysname, target, sizeof(target));
 476                 if (ret < 0)
 477                         continue;
 478
 479                 target[ret] = '\0';
 480                 p = strrchr(target, '/');
 481                 if (p == NULL)
 482                         continue;
 483
 484                 sprintf(devname, "/dev/%s", p + 1);
 485                 ret = stat(devname, &devstat);
 486                 if (ret < 0)
 487                         continue;
 488
 489                 /* Sanity check: udev might have reordered the device nodes.
 490                  * Make sure the major/minor match. We should really use
 491                  * libudev.
 492                  */
 493                 if (major(devstat.st_rdev) == entity->info.v4l.major &&
 494                     minor(devstat.st_rdev) == entity->info.v4l.minor)
 495                         strcpy(entity->devname, devname);
 496         }
 497
 498         return 0;
 499 }
 500
 501 /*
 502  * media_open -
 503  */
 504 struct media_device *media_open(const char *name, int verbose)
 505 {
 506         struct media_device *media;
 507         int ret;
 508
 509         media = malloc(sizeof(*media));
 510         if (media == NULL) {
 511                 printf("%s: unable to allocate memory\n", __func__);
 512                 return NULL;
 513         }
 514         memset(media, 0, sizeof(*media));
 515
 516         if (verbose)
 517                 printf("Opening media device %s\n", name);
 518         media->fd = open(name, O_RDWR);
 519         if (media->fd < 0) {
 520                 media_close(media);
 521                 printf("%s: Can't open media device %s\n", __func__, name);
 522                 return NULL;
 523         }
 524
 525         if (verbose)
 526                 printf("Enumerating entities\n");
 527
 528         ret = media_enum_entities(media);
 529         if (ret < 0) {
 530                 printf("%s: Unable to enumerate entities for device %s (%s)\n",
 531                         __func__, name, strerror(-ret));
 532                 media_close(media);
 533                 return NULL;
 534         }
 535
 536         if (verbose) {
 537                 printf("Found %u entities\n", media->entities_count);
 538                 printf("Enumerating pads and links\n");
 539         }
 540
 541         ret = media_enum_links(media);
 542         if (ret < 0) {
 543                 printf("%s: Unable to enumerate pads and linksfor device %s\n",
 544                         __func__, name);
 545                 media_close(media);
 546                 return NULL;
 547         }
 548
 549         return media;
 550 }
 551
 552 /*
 553  * media_close -
 554  */
 555 void media_close(struct media_device *media)
 556 {
 557         unsigned int i;
 558
 559         if (media->fd != -1)
 560                 close(media->fd);
 561
 562         for (i = 0; i < media->entities_count; ++i) {
 563                 struct media_entity *entity = &media->entities[i];
 564
 565                 free(entity->pads);
 566                 free(entity->links);
 567                 if (entity->fd != -1)
 568                         close(entity->fd);
 569         }
 570
 571         free(media->entities);
 572         free(media);
 573 }
 574