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 22int 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, 109 MEDIA_PAD_FL_SOURCE, 110 PAD_SIGNAL_ANALOG); 111 pad_sink = media_get_pad_index(if_vid, 112 MEDIA_PAD_FL_SINK, 113 PAD_SIGNAL_ANALOG); 114 if (pad_source < 0 || pad_sink < 0) { 115 dev_warn(mdev->dev, "Couldn't get tuner and/or PLL pad(s): (%d, %d)\n", 116 pad_source, pad_sink); 117 return -EINVAL; 118 } 119 ret = media_create_pad_link(tuner, pad_source, 120 if_vid, pad_sink, 121 MEDIA_LNK_FL_ENABLED); 122 if (ret) { 123 dev_warn(mdev->dev, "Couldn't create tuner->PLL link)\n"); 124 return ret; 125 } 126 127 pad_source = media_get_pad_index(if_vid, 128 MEDIA_PAD_FL_SOURCE, 129 PAD_SIGNAL_ANALOG); 130 pad_sink = media_get_pad_index(decoder, 131 MEDIA_PAD_FL_SINK, 132 PAD_SIGNAL_ANALOG); 133 if (pad_source < 0 || pad_sink < 0) { 134 dev_warn(mdev->dev, "get decoder and/or PLL pad(s): (%d, %d)\n", 135 pad_source, pad_sink); 136 return -EINVAL; 137 } 138 ret = media_create_pad_link(if_vid, pad_source, 139 decoder, pad_sink, 140 MEDIA_LNK_FL_ENABLED); 141 if (ret) { 142 dev_warn(mdev->dev, "couldn't link PLL to decoder\n"); 143 return ret; 144 } 145 } else { 146 pad_source = media_get_pad_index(tuner, 147 MEDIA_PAD_FL_SOURCE, 148 PAD_SIGNAL_ANALOG); 149 pad_sink = media_get_pad_index(decoder, 150 MEDIA_PAD_FL_SINK, 151 PAD_SIGNAL_ANALOG); 152 if (pad_source < 0 || pad_sink < 0) { 153 dev_warn(mdev->dev, "couldn't get tuner and/or decoder pad(s): (%d, %d)\n", 154 pad_source, pad_sink); 155 return -EINVAL; 156 } 157 ret = media_create_pad_link(tuner, pad_source, 158 decoder, pad_sink, 159 MEDIA_LNK_FL_ENABLED); 160 if (ret) 161 return ret; 162 } 163 164 if (if_aud) { 165 pad_source = media_get_pad_index(tuner, 166 MEDIA_PAD_FL_SOURCE, 167 PAD_SIGNAL_AUDIO); 168 pad_sink = media_get_pad_index(if_aud, 169 MEDIA_PAD_FL_SINK, 170 PAD_SIGNAL_AUDIO); 171 if (pad_source < 0 || pad_sink < 0) { 172 dev_warn(mdev->dev, "couldn't get tuner and/or decoder pad(s) for audio: (%d, %d)\n", 173 pad_source, pad_sink); 174 return -EINVAL; 175 } 176 ret = media_create_pad_link(tuner, pad_source, 177 if_aud, pad_sink, 178 MEDIA_LNK_FL_ENABLED); 179 if (ret) { 180 dev_warn(mdev->dev, "couldn't link tuner->audio PLL\n"); 181 return ret; 182 } 183 } else { 184 if_aud = tuner; 185 } 186 187 } 188 189 /* Create demod to V4L, VBI and SDR radio links */ 190 if (io_v4l) { 191 pad_source = media_get_pad_index(decoder, MEDIA_PAD_FL_SOURCE, 192 PAD_SIGNAL_DV); 193 if (pad_source < 0) { 194 dev_warn(mdev->dev, "couldn't get decoder output pad for V4L I/O\n"); 195 return -EINVAL; 196 } 197 ret = media_create_pad_link(decoder, pad_source, 198 io_v4l, 0, 199 MEDIA_LNK_FL_ENABLED); 200 if (ret) { 201 dev_warn(mdev->dev, "couldn't link decoder output to V4L I/O\n"); 202 return ret; 203 } 204 } 205 206 if (io_swradio) { 207 pad_source = media_get_pad_index(decoder, MEDIA_PAD_FL_SOURCE, 208 PAD_SIGNAL_DV); 209 if (pad_source < 0) { 210 dev_warn(mdev->dev, "couldn't get decoder output pad for SDR\n"); 211 return -EINVAL; 212 } 213 ret = media_create_pad_link(decoder, pad_source, 214 io_swradio, 0, 215 MEDIA_LNK_FL_ENABLED); 216 if (ret) { 217 dev_warn(mdev->dev, "couldn't link decoder output to SDR\n"); 218 return ret; 219 } 220 } 221 222 if (io_vbi) { 223 pad_source = media_get_pad_index(decoder, MEDIA_PAD_FL_SOURCE, 224 PAD_SIGNAL_DV); 225 if (pad_source < 0) { 226 dev_warn(mdev->dev, "couldn't get decoder output pad for VBI\n"); 227 return -EINVAL; 228 } 229 ret = media_create_pad_link(decoder, pad_source, 230 io_vbi, 0, 231 MEDIA_LNK_FL_ENABLED); 232 if (ret) { 233 dev_warn(mdev->dev, "couldn't link decoder output to VBI\n"); 234 return ret; 235 } 236 } 237 238 /* Create links for the media connectors */ 239 flags = MEDIA_LNK_FL_ENABLED; 240 media_device_for_each_entity(entity, mdev) { 241 switch (entity->function) { 242 case MEDIA_ENT_F_CONN_RF: 243 if (!tuner) 244 continue; 245 pad_sink = media_get_pad_index(tuner, MEDIA_PAD_FL_SINK, 246 PAD_SIGNAL_ANALOG); 247 if (pad_sink < 0) { 248 dev_warn(mdev->dev, "couldn't get tuner analog pad sink\n"); 249 return -EINVAL; 250 } 251 ret = media_create_pad_link(entity, 0, tuner, 252 pad_sink, 253 flags); 254 break; 255 case MEDIA_ENT_F_CONN_SVIDEO: 256 case MEDIA_ENT_F_CONN_COMPOSITE: 257 pad_sink = media_get_pad_index(decoder, 258 MEDIA_PAD_FL_SINK, 259 PAD_SIGNAL_ANALOG); 260 if (pad_sink < 0) { 261 dev_warn(mdev->dev, "couldn't get decoder analog pad sink\n"); 262 return -EINVAL; 263 } 264 ret = media_create_pad_link(entity, 0, decoder, 265 pad_sink, 266 flags); 267 break; 268 default: 269 continue; 270 } 271 if (ret) 272 return ret; 273 274 flags = 0; 275 } 276 277 return 0; 278} 279EXPORT_SYMBOL_GPL(v4l2_mc_create_media_graph); 280 281int v4l_enable_media_source(struct video_device *vdev) 282{ 283 struct media_device *mdev = vdev->entity.graph_obj.mdev; 284 int ret = 0, err; 285 286 if (!mdev) 287 return 0; 288 289 mutex_lock(&mdev->graph_mutex); 290 if (!mdev->enable_source) 291 goto end; 292 err = mdev->enable_source(&vdev->entity, &vdev->pipe); 293 if (err) 294 ret = -EBUSY; 295end: 296 mutex_unlock(&mdev->graph_mutex); 297 return ret; 298} 299EXPORT_SYMBOL_GPL(v4l_enable_media_source); 300 301void v4l_disable_media_source(struct video_device *vdev) 302{ 303 struct media_device *mdev = vdev->entity.graph_obj.mdev; 304 305 if (mdev) { 306 mutex_lock(&mdev->graph_mutex); 307 if (mdev->disable_source) 308 mdev->disable_source(&vdev->entity); 309 mutex_unlock(&mdev->graph_mutex); 310 } 311} 312EXPORT_SYMBOL_GPL(v4l_disable_media_source); 313 314int v4l_vb2q_enable_media_source(struct vb2_queue *q) 315{ 316 struct v4l2_fh *fh = q->owner; 317 318 if (fh && fh->vdev) 319 return v4l_enable_media_source(fh->vdev); 320 return 0; 321} 322EXPORT_SYMBOL_GPL(v4l_vb2q_enable_media_source); 323 324int v4l2_create_fwnode_links_to_pad(struct v4l2_subdev *src_sd, 325 struct media_pad *sink, u32 flags) 326{ 327 struct fwnode_handle *endpoint; 328 329 if (!(sink->flags & MEDIA_PAD_FL_SINK)) 330 return -EINVAL; 331 332 fwnode_graph_for_each_endpoint(dev_fwnode(src_sd->dev), endpoint) { 333 struct fwnode_handle *remote_ep; 334 int src_idx, sink_idx, ret; 335 struct media_pad *src; 336 337 src_idx = media_entity_get_fwnode_pad(&src_sd->entity, 338 endpoint, 339 MEDIA_PAD_FL_SOURCE); 340 if (src_idx < 0) 341 continue; 342 343 remote_ep = fwnode_graph_get_remote_endpoint(endpoint); 344 if (!remote_ep) 345 continue; 346 347 /* 348 * ask the sink to verify it owns the remote endpoint, 349 * and translate to a sink pad. 350 */ 351 sink_idx = media_entity_get_fwnode_pad(sink->entity, 352 remote_ep, 353 MEDIA_PAD_FL_SINK); 354 fwnode_handle_put(remote_ep); 355 356 if (sink_idx < 0 || sink_idx != sink->index) 357 continue; 358 359 /* 360 * the source endpoint corresponds to one of its source pads, 361 * the source endpoint connects to an endpoint at the sink 362 * entity, and the sink endpoint corresponds to the sink 363 * pad requested, so we have found an endpoint connection 364 * that works, create the media link for it. 365 */ 366 367 src = &src_sd->entity.pads[src_idx]; 368 369 /* skip if link already exists */ 370 if (media_entity_find_link(src, sink)) 371 continue; 372 373 dev_dbg(src_sd->dev, "creating link %s:%d -> %s:%d\n", 374 src_sd->entity.name, src_idx, 375 sink->entity->name, sink_idx); 376 377 ret = media_create_pad_link(&src_sd->entity, src_idx, 378 sink->entity, sink_idx, flags); 379 if (ret) { 380 dev_err(src_sd->dev, 381 "link %s:%d -> %s:%d failed with %d\n", 382 src_sd->entity.name, src_idx, 383 sink->entity->name, sink_idx, ret); 384 385 fwnode_handle_put(endpoint); 386 return ret; 387 } 388 } 389 390 return 0; 391} 392EXPORT_SYMBOL_GPL(v4l2_create_fwnode_links_to_pad); 393 394int v4l2_create_fwnode_links(struct v4l2_subdev *src_sd, 395 struct v4l2_subdev *sink_sd) 396{ 397 unsigned int i; 398 399 for (i = 0; i < sink_sd->entity.num_pads; i++) { 400 struct media_pad *pad = &sink_sd->entity.pads[i]; 401 int ret; 402 403 if (!(pad->flags & MEDIA_PAD_FL_SINK)) 404 continue; 405 406 ret = v4l2_create_fwnode_links_to_pad(src_sd, pad, 0); 407 if (ret) 408 return ret; 409 } 410 411 return 0; 412} 413EXPORT_SYMBOL_GPL(v4l2_create_fwnode_links); 414 415/* ----------------------------------------------------------------------------- 416 * Pipeline power management 417 * 418 * Entities must be powered up when part of a pipeline that contains at least 419 * one open video device node. 420 * 421 * To achieve this use the entity use_count field to track the number of users. 422 * For entities corresponding to video device nodes the use_count field stores 423 * the users count of the node. For entities corresponding to subdevs the 424 * use_count field stores the total number of users of all video device nodes 425 * in the pipeline. 426 * 427 * The v4l2_pipeline_pm_{get, put}() functions must be called in the open() and 428 * close() handlers of video device nodes. It increments or decrements the use 429 * count of all subdev entities in the pipeline. 430 * 431 * To react to link management on powered pipelines, the link setup notification 432 * callback updates the use count of all entities in the source and sink sides 433 * of the link. 434 */ 435 436/* 437 * pipeline_pm_use_count - Count the number of users of a pipeline 438 * @entity: The entity 439 * 440 * Return the total number of users of all video device nodes in the pipeline. 441 */ 442static int pipeline_pm_use_count(struct media_entity *entity, 443 struct media_graph *graph) 444{ 445 int use = 0; 446 447 media_graph_walk_start(graph, entity); 448 449 while ((entity = media_graph_walk_next(graph))) { 450 if (is_media_entity_v4l2_video_device(entity)) 451 use += entity->use_count; 452 } 453 454 return use; 455} 456 457/* 458 * pipeline_pm_power_one - Apply power change to an entity 459 * @entity: The entity 460 * @change: Use count change 461 * 462 * Change the entity use count by @change. If the entity is a subdev update its 463 * power state by calling the core::s_power operation when the use count goes 464 * from 0 to != 0 or from != 0 to 0. 465 * 466 * Return 0 on success or a negative error code on failure. 467 */ 468static int pipeline_pm_power_one(struct media_entity *entity, int change) 469{ 470 struct v4l2_subdev *subdev; 471 int ret; 472 473 subdev = is_media_entity_v4l2_subdev(entity) 474 ? media_entity_to_v4l2_subdev(entity) : NULL; 475 476 if (entity->use_count == 0 && change > 0 && subdev != NULL) { 477 ret = v4l2_subdev_call(subdev, core, s_power, 1); 478 if (ret < 0 && ret != -ENOIOCTLCMD) 479 return ret; 480 } 481 482 entity->use_count += change; 483 WARN_ON(entity->use_count < 0); 484 485 if (entity->use_count == 0 && change < 0 && subdev != NULL) 486 v4l2_subdev_call(subdev, core, s_power, 0); 487 488 return 0; 489} 490 491/* 492 * pipeline_pm_power - Apply power change to all entities in a pipeline 493 * @entity: The entity 494 * @change: Use count change 495 * 496 * Walk the pipeline to update the use count and the power state of all non-node 497 * entities. 498 * 499 * Return 0 on success or a negative error code on failure. 500 */ 501static int pipeline_pm_power(struct media_entity *entity, int change, 502 struct media_graph *graph) 503{ 504 struct media_entity *first = entity; 505 int ret = 0; 506 507 if (!change) 508 return 0; 509 510 media_graph_walk_start(graph, entity); 511 512 while (!ret && (entity = media_graph_walk_next(graph))) 513 if (is_media_entity_v4l2_subdev(entity)) 514 ret = pipeline_pm_power_one(entity, change); 515 516 if (!ret) 517 return ret; 518 519 media_graph_walk_start(graph, first); 520 521 while ((first = media_graph_walk_next(graph)) 522 && first != entity) 523 if (is_media_entity_v4l2_subdev(first)) 524 pipeline_pm_power_one(first, -change); 525 526 return ret; 527} 528 529static int v4l2_pipeline_pm_use(struct media_entity *entity, unsigned int use) 530{ 531 struct media_device *mdev = entity->graph_obj.mdev; 532 int change = use ? 1 : -1; 533 int ret; 534 535 mutex_lock(&mdev->graph_mutex); 536 537 /* Apply use count to node. */ 538 entity->use_count += change; 539 WARN_ON(entity->use_count < 0); 540 541 /* Apply power change to connected non-nodes. */ 542 ret = pipeline_pm_power(entity, change, &mdev->pm_count_walk); 543 if (ret < 0) 544 entity->use_count -= change; 545 546 mutex_unlock(&mdev->graph_mutex); 547 548 return ret; 549} 550 551int v4l2_pipeline_pm_get(struct media_entity *entity) 552{ 553 return v4l2_pipeline_pm_use(entity, 1); 554} 555EXPORT_SYMBOL_GPL(v4l2_pipeline_pm_get); 556 557void v4l2_pipeline_pm_put(struct media_entity *entity) 558{ 559 /* Powering off entities shouldn't fail. */ 560 WARN_ON(v4l2_pipeline_pm_use(entity, 0)); 561} 562EXPORT_SYMBOL_GPL(v4l2_pipeline_pm_put); 563 564int v4l2_pipeline_link_notify(struct media_link *link, u32 flags, 565 unsigned int notification) 566{ 567 struct media_graph *graph = &link->graph_obj.mdev->pm_count_walk; 568 struct media_entity *source = link->source->entity; 569 struct media_entity *sink = link->sink->entity; 570 int source_use; 571 int sink_use; 572 int ret = 0; 573 574 source_use = pipeline_pm_use_count(source, graph); 575 sink_use = pipeline_pm_use_count(sink, graph); 576 577 if (notification == MEDIA_DEV_NOTIFY_POST_LINK_CH && 578 !(flags & MEDIA_LNK_FL_ENABLED)) { 579 /* Powering off entities is assumed to never fail. */ 580 pipeline_pm_power(source, -sink_use, graph); 581 pipeline_pm_power(sink, -source_use, graph); 582 return 0; 583 } 584 585 if (notification == MEDIA_DEV_NOTIFY_PRE_LINK_CH && 586 (flags & MEDIA_LNK_FL_ENABLED)) { 587 588 ret = pipeline_pm_power(source, sink_use, graph); 589 if (ret < 0) 590 return ret; 591 592 ret = pipeline_pm_power(sink, source_use, graph); 593 if (ret < 0) 594 pipeline_pm_power(source, -sink_use, graph); 595 } 596 597 return ret; 598} 599EXPORT_SYMBOL_GPL(v4l2_pipeline_link_notify); 600