1 // SPDX-License-Identifier: GPL-2.0-or-later 2 3 /* 4 * Media Controller ancillary functions 5 * 6 * Copyright (c) 2016 Mauro Carvalho Chehab <mchehab@kernel.org> 7 * Copyright (C) 2016 Shuah Khan <shuahkh@osg.samsung.com> 8 * Copyright (C) 2006-2010 Nokia Corporation 9 * Copyright (c) 2016 Intel Corporation. 10 */ 11 12 #include <linux/module.h> 13 #include <linux/pci.h> 14 #include <linux/usb.h> 15 #include <media/media-device.h> 16 #include <media/media-entity.h> 17 #include <media/v4l2-fh.h> 18 #include <media/v4l2-mc.h> 19 #include <media/v4l2-subdev.h> 20 #include <media/videobuf2-core.h> 21 22 int v4l2_mc_create_media_graph(struct media_device *mdev) 23 24 { 25 struct media_entity *entity; 26 struct media_entity *if_vid = NULL, *if_aud = NULL; 27 struct media_entity *tuner = NULL, *decoder = NULL; 28 struct media_entity *io_v4l = NULL, *io_vbi = NULL, *io_swradio = NULL; 29 bool is_webcam = false; 30 u32 flags; 31 int ret, pad_sink, pad_source; 32 33 if (!mdev) 34 return 0; 35 36 media_device_for_each_entity(entity, mdev) { 37 switch (entity->function) { 38 case MEDIA_ENT_F_IF_VID_DECODER: 39 if_vid = entity; 40 break; 41 case MEDIA_ENT_F_IF_AUD_DECODER: 42 if_aud = entity; 43 break; 44 case MEDIA_ENT_F_TUNER: 45 tuner = entity; 46 break; 47 case MEDIA_ENT_F_ATV_DECODER: 48 decoder = entity; 49 break; 50 case MEDIA_ENT_F_IO_V4L: 51 io_v4l = entity; 52 break; 53 case MEDIA_ENT_F_IO_VBI: 54 io_vbi = entity; 55 break; 56 case MEDIA_ENT_F_IO_SWRADIO: 57 io_swradio = entity; 58 break; 59 case MEDIA_ENT_F_CAM_SENSOR: 60 is_webcam = true; 61 break; 62 } 63 } 64 65 /* It should have at least one I/O entity */ 66 if (!io_v4l && !io_vbi && !io_swradio) { 67 dev_warn(mdev->dev, "Didn't find any I/O entity\n"); 68 return -EINVAL; 69 } 70 71 /* 72 * Here, webcams are modelled on a very simple way: the sensor is 73 * connected directly to the I/O entity. All dirty details, like 74 * scaler and crop HW are hidden. While such mapping is not enough 75 * for mc-centric hardware, it is enough for v4l2 interface centric 76 * PC-consumer's hardware. 77 */ 78 if (is_webcam) { 79 if (!io_v4l) { 80 dev_warn(mdev->dev, "Didn't find a MEDIA_ENT_F_IO_V4L\n"); 81 return -EINVAL; 82 } 83 84 media_device_for_each_entity(entity, mdev) { 85 if (entity->function != MEDIA_ENT_F_CAM_SENSOR) 86 continue; 87 ret = media_create_pad_link(entity, 0, 88 io_v4l, 0, 89 MEDIA_LNK_FL_ENABLED); 90 if (ret) { 91 dev_warn(mdev->dev, "Failed to create a sensor link\n"); 92 return ret; 93 } 94 } 95 if (!decoder) 96 return 0; 97 } 98 99 /* The device isn't a webcam. So, it should have a decoder */ 100 if (!decoder) { 101 dev_warn(mdev->dev, "Decoder not found\n"); 102 return -EINVAL; 103 } 104 105 /* Link the tuner and IF video output pads */ 106 if (tuner) { 107 if (if_vid) { 108 pad_source = media_get_pad_index(tuner, false, 109 PAD_SIGNAL_ANALOG); 110 pad_sink = media_get_pad_index(if_vid, true, 111 PAD_SIGNAL_ANALOG); 112 if (pad_source < 0 || pad_sink < 0) { 113 dev_warn(mdev->dev, "Couldn't get tuner and/or PLL pad(s): (%d, %d)\n", 114 pad_source, pad_sink); 115 return -EINVAL; 116 } 117 ret = media_create_pad_link(tuner, pad_source, 118 if_vid, pad_sink, 119 MEDIA_LNK_FL_ENABLED); 120 if (ret) { 121 dev_warn(mdev->dev, "Couldn't create tuner->PLL link)\n"); 122 return ret; 123 } 124 125 pad_source = media_get_pad_index(if_vid, false, 126 PAD_SIGNAL_ANALOG); 127 pad_sink = media_get_pad_index(decoder, true, 128 PAD_SIGNAL_ANALOG); 129 if (pad_source < 0 || pad_sink < 0) { 130 dev_warn(mdev->dev, "get decoder and/or PLL pad(s): (%d, %d)\n", 131 pad_source, pad_sink); 132 return -EINVAL; 133 } 134 ret = media_create_pad_link(if_vid, pad_source, 135 decoder, pad_sink, 136 MEDIA_LNK_FL_ENABLED); 137 if (ret) { 138 dev_warn(mdev->dev, "couldn't link PLL to decoder\n"); 139 return ret; 140 } 141 } else { 142 pad_source = media_get_pad_index(tuner, false, 143 PAD_SIGNAL_ANALOG); 144 pad_sink = media_get_pad_index(decoder, true, 145 PAD_SIGNAL_ANALOG); 146 if (pad_source < 0 || pad_sink < 0) { 147 dev_warn(mdev->dev, "couldn't get tuner and/or decoder pad(s): (%d, %d)\n", 148 pad_source, pad_sink); 149 return -EINVAL; 150 } 151 ret = media_create_pad_link(tuner, pad_source, 152 decoder, pad_sink, 153 MEDIA_LNK_FL_ENABLED); 154 if (ret) 155 return ret; 156 } 157 158 if (if_aud) { 159 pad_source = media_get_pad_index(tuner, false, 160 PAD_SIGNAL_AUDIO); 161 pad_sink = media_get_pad_index(if_aud, true, 162 PAD_SIGNAL_AUDIO); 163 if (pad_source < 0 || pad_sink < 0) { 164 dev_warn(mdev->dev, "couldn't get tuner and/or decoder pad(s) for audio: (%d, %d)\n", 165 pad_source, pad_sink); 166 return -EINVAL; 167 } 168 ret = media_create_pad_link(tuner, pad_source, 169 if_aud, pad_sink, 170 MEDIA_LNK_FL_ENABLED); 171 if (ret) { 172 dev_warn(mdev->dev, "couldn't link tuner->audio PLL\n"); 173 return ret; 174 } 175 } else { 176 if_aud = tuner; 177 } 178 179 } 180 181 /* Create demod to V4L, VBI and SDR radio links */ 182 if (io_v4l) { 183 pad_source = media_get_pad_index(decoder, false, PAD_SIGNAL_DV); 184 if (pad_source < 0) { 185 dev_warn(mdev->dev, "couldn't get decoder output pad for V4L I/O\n"); 186 return -EINVAL; 187 } 188 ret = media_create_pad_link(decoder, pad_source, 189 io_v4l, 0, 190 MEDIA_LNK_FL_ENABLED); 191 if (ret) { 192 dev_warn(mdev->dev, "couldn't link decoder output to V4L I/O\n"); 193 return ret; 194 } 195 } 196 197 if (io_swradio) { 198 pad_source = media_get_pad_index(decoder, false, PAD_SIGNAL_DV); 199 if (pad_source < 0) { 200 dev_warn(mdev->dev, "couldn't get decoder output pad for SDR\n"); 201 return -EINVAL; 202 } 203 ret = media_create_pad_link(decoder, pad_source, 204 io_swradio, 0, 205 MEDIA_LNK_FL_ENABLED); 206 if (ret) { 207 dev_warn(mdev->dev, "couldn't link decoder output to SDR\n"); 208 return ret; 209 } 210 } 211 212 if (io_vbi) { 213 pad_source = media_get_pad_index(decoder, false, PAD_SIGNAL_DV); 214 if (pad_source < 0) { 215 dev_warn(mdev->dev, "couldn't get decoder output pad for VBI\n"); 216 return -EINVAL; 217 } 218 ret = media_create_pad_link(decoder, pad_source, 219 io_vbi, 0, 220 MEDIA_LNK_FL_ENABLED); 221 if (ret) { 222 dev_warn(mdev->dev, "couldn't link decoder output to VBI\n"); 223 return ret; 224 } 225 } 226 227 /* Create links for the media connectors */ 228 flags = MEDIA_LNK_FL_ENABLED; 229 media_device_for_each_entity(entity, mdev) { 230 switch (entity->function) { 231 case MEDIA_ENT_F_CONN_RF: 232 if (!tuner) 233 continue; 234 pad_sink = media_get_pad_index(tuner, true, 235 PAD_SIGNAL_ANALOG); 236 if (pad_sink < 0) { 237 dev_warn(mdev->dev, "couldn't get tuner analog pad sink\n"); 238 return -EINVAL; 239 } 240 ret = media_create_pad_link(entity, 0, tuner, 241 pad_sink, 242 flags); 243 break; 244 case MEDIA_ENT_F_CONN_SVIDEO: 245 case MEDIA_ENT_F_CONN_COMPOSITE: 246 pad_sink = media_get_pad_index(decoder, true, 247 PAD_SIGNAL_ANALOG); 248 if (pad_sink < 0) { 249 dev_warn(mdev->dev, "couldn't get decoder analog pad sink\n"); 250 return -EINVAL; 251 } 252 ret = media_create_pad_link(entity, 0, decoder, 253 pad_sink, 254 flags); 255 break; 256 default: 257 continue; 258 } 259 if (ret) 260 return ret; 261 262 flags = 0; 263 } 264 265 return 0; 266 } 267 EXPORT_SYMBOL_GPL(v4l2_mc_create_media_graph); 268 269 int v4l_enable_media_source(struct video_device *vdev) 270 { 271 struct media_device *mdev = vdev->entity.graph_obj.mdev; 272 int ret = 0, err; 273 274 if (!mdev) 275 return 0; 276 277 mutex_lock(&mdev->graph_mutex); 278 if (!mdev->enable_source) 279 goto end; 280 err = mdev->enable_source(&vdev->entity, &vdev->pipe); 281 if (err) 282 ret = -EBUSY; 283 end: 284 mutex_unlock(&mdev->graph_mutex); 285 return ret; 286 } 287 EXPORT_SYMBOL_GPL(v4l_enable_media_source); 288 289 void v4l_disable_media_source(struct video_device *vdev) 290 { 291 struct media_device *mdev = vdev->entity.graph_obj.mdev; 292 293 if (mdev) { 294 mutex_lock(&mdev->graph_mutex); 295 if (mdev->disable_source) 296 mdev->disable_source(&vdev->entity); 297 mutex_unlock(&mdev->graph_mutex); 298 } 299 } 300 EXPORT_SYMBOL_GPL(v4l_disable_media_source); 301 302 int v4l_vb2q_enable_media_source(struct vb2_queue *q) 303 { 304 struct v4l2_fh *fh = q->owner; 305 306 if (fh && fh->vdev) 307 return v4l_enable_media_source(fh->vdev); 308 return 0; 309 } 310 EXPORT_SYMBOL_GPL(v4l_vb2q_enable_media_source); 311 312 int v4l2_create_fwnode_links_to_pad(struct v4l2_subdev *src_sd, 313 struct media_pad *sink, u32 flags) 314 { 315 struct fwnode_handle *endpoint; 316 317 if (!(sink->flags & MEDIA_PAD_FL_SINK)) 318 return -EINVAL; 319 320 fwnode_graph_for_each_endpoint(dev_fwnode(src_sd->dev), endpoint) { 321 struct fwnode_handle *remote_ep; 322 int src_idx, sink_idx, ret; 323 struct media_pad *src; 324 325 src_idx = media_entity_get_fwnode_pad(&src_sd->entity, 326 endpoint, 327 MEDIA_PAD_FL_SOURCE); 328 if (src_idx < 0) 329 continue; 330 331 remote_ep = fwnode_graph_get_remote_endpoint(endpoint); 332 if (!remote_ep) 333 continue; 334 335 /* 336 * ask the sink to verify it owns the remote endpoint, 337 * and translate to a sink pad. 338 */ 339 sink_idx = media_entity_get_fwnode_pad(sink->entity, 340 remote_ep, 341 MEDIA_PAD_FL_SINK); 342 fwnode_handle_put(remote_ep); 343 344 if (sink_idx < 0 || sink_idx != sink->index) 345 continue; 346 347 /* 348 * the source endpoint corresponds to one of its source pads, 349 * the source endpoint connects to an endpoint at the sink 350 * entity, and the sink endpoint corresponds to the sink 351 * pad requested, so we have found an endpoint connection 352 * that works, create the media link for it. 353 */ 354 355 src = &src_sd->entity.pads[src_idx]; 356 357 /* skip if link already exists */ 358 if (media_entity_find_link(src, sink)) 359 continue; 360 361 dev_dbg(src_sd->dev, "creating link %s:%d -> %s:%d\n", 362 src_sd->entity.name, src_idx, 363 sink->entity->name, sink_idx); 364 365 ret = media_create_pad_link(&src_sd->entity, src_idx, 366 sink->entity, sink_idx, flags); 367 if (ret) { 368 dev_err(src_sd->dev, 369 "link %s:%d -> %s:%d failed with %d\n", 370 src_sd->entity.name, src_idx, 371 sink->entity->name, sink_idx, ret); 372 373 fwnode_handle_put(endpoint); 374 return ret; 375 } 376 } 377 378 return 0; 379 } 380 EXPORT_SYMBOL_GPL(v4l2_create_fwnode_links_to_pad); 381 382 int v4l2_create_fwnode_links(struct v4l2_subdev *src_sd, 383 struct v4l2_subdev *sink_sd) 384 { 385 unsigned int i; 386 387 for (i = 0; i < sink_sd->entity.num_pads; i++) { 388 struct media_pad *pad = &sink_sd->entity.pads[i]; 389 int ret; 390 391 if (!(pad->flags & MEDIA_PAD_FL_SINK)) 392 continue; 393 394 ret = v4l2_create_fwnode_links_to_pad(src_sd, pad, 0); 395 if (ret) 396 return ret; 397 } 398 399 return 0; 400 } 401 EXPORT_SYMBOL_GPL(v4l2_create_fwnode_links); 402 403 /* ----------------------------------------------------------------------------- 404 * Pipeline power management 405 * 406 * Entities must be powered up when part of a pipeline that contains at least 407 * one open video device node. 408 * 409 * To achieve this use the entity use_count field to track the number of users. 410 * For entities corresponding to video device nodes the use_count field stores 411 * the users count of the node. For entities corresponding to subdevs the 412 * use_count field stores the total number of users of all video device nodes 413 * in the pipeline. 414 * 415 * The v4l2_pipeline_pm_{get, put}() functions must be called in the open() and 416 * close() handlers of video device nodes. It increments or decrements the use 417 * count of all subdev entities in the pipeline. 418 * 419 * To react to link management on powered pipelines, the link setup notification 420 * callback updates the use count of all entities in the source and sink sides 421 * of the link. 422 */ 423 424 /* 425 * pipeline_pm_use_count - Count the number of users of a pipeline 426 * @entity: The entity 427 * 428 * Return the total number of users of all video device nodes in the pipeline. 429 */ 430 static int pipeline_pm_use_count(struct media_entity *entity, 431 struct media_graph *graph) 432 { 433 int use = 0; 434 435 media_graph_walk_start(graph, entity); 436 437 while ((entity = media_graph_walk_next(graph))) { 438 if (is_media_entity_v4l2_video_device(entity)) 439 use += entity->use_count; 440 } 441 442 return use; 443 } 444 445 /* 446 * pipeline_pm_power_one - Apply power change to an entity 447 * @entity: The entity 448 * @change: Use count change 449 * 450 * Change the entity use count by @change. If the entity is a subdev update its 451 * power state by calling the core::s_power operation when the use count goes 452 * from 0 to != 0 or from != 0 to 0. 453 * 454 * Return 0 on success or a negative error code on failure. 455 */ 456 static int pipeline_pm_power_one(struct media_entity *entity, int change) 457 { 458 struct v4l2_subdev *subdev; 459 int ret; 460 461 subdev = is_media_entity_v4l2_subdev(entity) 462 ? media_entity_to_v4l2_subdev(entity) : NULL; 463 464 if (entity->use_count == 0 && change > 0 && subdev != NULL) { 465 ret = v4l2_subdev_call(subdev, core, s_power, 1); 466 if (ret < 0 && ret != -ENOIOCTLCMD) 467 return ret; 468 } 469 470 entity->use_count += change; 471 WARN_ON(entity->use_count < 0); 472 473 if (entity->use_count == 0 && change < 0 && subdev != NULL) 474 v4l2_subdev_call(subdev, core, s_power, 0); 475 476 return 0; 477 } 478 479 /* 480 * pipeline_pm_power - Apply power change to all entities in a pipeline 481 * @entity: The entity 482 * @change: Use count change 483 * 484 * Walk the pipeline to update the use count and the power state of all non-node 485 * entities. 486 * 487 * Return 0 on success or a negative error code on failure. 488 */ 489 static int pipeline_pm_power(struct media_entity *entity, int change, 490 struct media_graph *graph) 491 { 492 struct media_entity *first = entity; 493 int ret = 0; 494 495 if (!change) 496 return 0; 497 498 media_graph_walk_start(graph, entity); 499 500 while (!ret && (entity = media_graph_walk_next(graph))) 501 if (is_media_entity_v4l2_subdev(entity)) 502 ret = pipeline_pm_power_one(entity, change); 503 504 if (!ret) 505 return ret; 506 507 media_graph_walk_start(graph, first); 508 509 while ((first = media_graph_walk_next(graph)) 510 && first != entity) 511 if (is_media_entity_v4l2_subdev(first)) 512 pipeline_pm_power_one(first, -change); 513 514 return ret; 515 } 516 517 static int v4l2_pipeline_pm_use(struct media_entity *entity, unsigned int use) 518 { 519 struct media_device *mdev = entity->graph_obj.mdev; 520 int change = use ? 1 : -1; 521 int ret; 522 523 mutex_lock(&mdev->graph_mutex); 524 525 /* Apply use count to node. */ 526 entity->use_count += change; 527 WARN_ON(entity->use_count < 0); 528 529 /* Apply power change to connected non-nodes. */ 530 ret = pipeline_pm_power(entity, change, &mdev->pm_count_walk); 531 if (ret < 0) 532 entity->use_count -= change; 533 534 mutex_unlock(&mdev->graph_mutex); 535 536 return ret; 537 } 538 539 int v4l2_pipeline_pm_get(struct media_entity *entity) 540 { 541 return v4l2_pipeline_pm_use(entity, 1); 542 } 543 EXPORT_SYMBOL_GPL(v4l2_pipeline_pm_get); 544 545 void v4l2_pipeline_pm_put(struct media_entity *entity) 546 { 547 /* Powering off entities shouldn't fail. */ 548 WARN_ON(v4l2_pipeline_pm_use(entity, 0)); 549 } 550 EXPORT_SYMBOL_GPL(v4l2_pipeline_pm_put); 551 552 int v4l2_pipeline_link_notify(struct media_link *link, u32 flags, 553 unsigned int notification) 554 { 555 struct media_graph *graph = &link->graph_obj.mdev->pm_count_walk; 556 struct media_entity *source = link->source->entity; 557 struct media_entity *sink = link->sink->entity; 558 int source_use; 559 int sink_use; 560 int ret = 0; 561 562 source_use = pipeline_pm_use_count(source, graph); 563 sink_use = pipeline_pm_use_count(sink, graph); 564 565 if (notification == MEDIA_DEV_NOTIFY_POST_LINK_CH && 566 !(flags & MEDIA_LNK_FL_ENABLED)) { 567 /* Powering off entities is assumed to never fail. */ 568 pipeline_pm_power(source, -sink_use, graph); 569 pipeline_pm_power(sink, -source_use, graph); 570 return 0; 571 } 572 573 if (notification == MEDIA_DEV_NOTIFY_PRE_LINK_CH && 574 (flags & MEDIA_LNK_FL_ENABLED)) { 575 576 ret = pipeline_pm_power(source, sink_use, graph); 577 if (ret < 0) 578 return ret; 579 580 ret = pipeline_pm_power(sink, source_use, graph); 581 if (ret < 0) 582 pipeline_pm_power(source, -sink_use, graph); 583 } 584 585 return ret; 586 } 587 EXPORT_SYMBOL_GPL(v4l2_pipeline_link_notify); 588