1 // SPDX-License-Identifier: LGPL-2.1-or-later 2 /* 3 * dvbdev.c 4 * 5 * Copyright (C) 2000 Ralph Metzler <ralph@convergence.de> 6 * & Marcus Metzler <marcus@convergence.de> 7 * for convergence integrated media GmbH 8 */ 9 10 #define pr_fmt(fmt) "dvbdev: " fmt 11 12 #include <linux/types.h> 13 #include <linux/errno.h> 14 #include <linux/string.h> 15 #include <linux/module.h> 16 #include <linux/kernel.h> 17 #include <linux/i2c.h> 18 #include <linux/init.h> 19 #include <linux/slab.h> 20 #include <linux/device.h> 21 #include <linux/fs.h> 22 #include <linux/cdev.h> 23 #include <linux/mutex.h> 24 #include <media/dvbdev.h> 25 26 /* Due to enum tuner_pad_index */ 27 #include <media/tuner.h> 28 29 static DEFINE_MUTEX(dvbdev_mutex); 30 static LIST_HEAD(dvbdevfops_list); 31 static int dvbdev_debug; 32 33 module_param(dvbdev_debug, int, 0644); 34 MODULE_PARM_DESC(dvbdev_debug, "Turn on/off device debugging (default:off)."); 35 36 #define dprintk(fmt, arg...) do { \ 37 if (dvbdev_debug) \ 38 printk(KERN_DEBUG pr_fmt("%s: " fmt), \ 39 __func__, ##arg); \ 40 } while (0) 41 42 static LIST_HEAD(dvb_adapter_list); 43 static DEFINE_MUTEX(dvbdev_register_lock); 44 45 static const char * const dnames[] = { 46 [DVB_DEVICE_VIDEO] = "video", 47 [DVB_DEVICE_AUDIO] = "audio", 48 [DVB_DEVICE_SEC] = "sec", 49 [DVB_DEVICE_FRONTEND] = "frontend", 50 [DVB_DEVICE_DEMUX] = "demux", 51 [DVB_DEVICE_DVR] = "dvr", 52 [DVB_DEVICE_CA] = "ca", 53 [DVB_DEVICE_NET] = "net", 54 [DVB_DEVICE_OSD] = "osd" 55 }; 56 57 #ifdef CONFIG_DVB_DYNAMIC_MINORS 58 #define MAX_DVB_MINORS 256 59 #define DVB_MAX_IDS MAX_DVB_MINORS 60 #else 61 #define DVB_MAX_IDS 4 62 63 static const u8 minor_type[] = { 64 [DVB_DEVICE_VIDEO] = 0, 65 [DVB_DEVICE_AUDIO] = 1, 66 [DVB_DEVICE_SEC] = 2, 67 [DVB_DEVICE_FRONTEND] = 3, 68 [DVB_DEVICE_DEMUX] = 4, 69 [DVB_DEVICE_DVR] = 5, 70 [DVB_DEVICE_CA] = 6, 71 [DVB_DEVICE_NET] = 7, 72 [DVB_DEVICE_OSD] = 8, 73 }; 74 75 #define nums2minor(num, type, id) \ 76 (((num) << 6) | ((id) << 4) | minor_type[type]) 77 78 #define MAX_DVB_MINORS (DVB_MAX_ADAPTERS * 64) 79 #endif 80 81 static struct class *dvb_class; 82 83 static struct dvb_device *dvb_minors[MAX_DVB_MINORS]; 84 static DECLARE_RWSEM(minor_rwsem); 85 86 static int dvb_device_open(struct inode *inode, struct file *file) 87 { 88 struct dvb_device *dvbdev; 89 unsigned int minor = iminor(inode); 90 91 if (minor >= MAX_DVB_MINORS) 92 return -ENODEV; 93 94 mutex_lock(&dvbdev_mutex); 95 down_read(&minor_rwsem); 96 97 dvbdev = dvb_minors[minor]; 98 99 if (dvbdev && dvbdev->fops) { 100 int err = 0; 101 const struct file_operations *new_fops; 102 103 new_fops = fops_get(dvbdev->fops); 104 if (!new_fops) 105 goto fail; 106 file->private_data = dvb_device_get(dvbdev); 107 replace_fops(file, new_fops); 108 if (file->f_op->open) 109 err = file->f_op->open(inode, file); 110 up_read(&minor_rwsem); 111 mutex_unlock(&dvbdev_mutex); 112 if (err) 113 dvb_device_put(dvbdev); 114 return err; 115 } 116 fail: 117 up_read(&minor_rwsem); 118 mutex_unlock(&dvbdev_mutex); 119 return -ENODEV; 120 } 121 122 static const struct file_operations dvb_device_fops = { 123 .owner = THIS_MODULE, 124 .open = dvb_device_open, 125 .llseek = noop_llseek, 126 }; 127 128 static struct cdev dvb_device_cdev; 129 130 int dvb_generic_open(struct inode *inode, struct file *file) 131 { 132 struct dvb_device *dvbdev = file->private_data; 133 134 if (!dvbdev) 135 return -ENODEV; 136 137 if (!dvbdev->users) 138 return -EBUSY; 139 140 if ((file->f_flags & O_ACCMODE) == O_RDONLY) { 141 if (!dvbdev->readers) 142 return -EBUSY; 143 dvbdev->readers--; 144 } else { 145 if (!dvbdev->writers) 146 return -EBUSY; 147 dvbdev->writers--; 148 } 149 150 dvbdev->users--; 151 return 0; 152 } 153 EXPORT_SYMBOL(dvb_generic_open); 154 155 int dvb_generic_release(struct inode *inode, struct file *file) 156 { 157 struct dvb_device *dvbdev = file->private_data; 158 159 if (!dvbdev) 160 return -ENODEV; 161 162 if ((file->f_flags & O_ACCMODE) == O_RDONLY) 163 dvbdev->readers++; 164 else 165 dvbdev->writers++; 166 167 dvbdev->users++; 168 169 dvb_device_put(dvbdev); 170 171 return 0; 172 } 173 EXPORT_SYMBOL(dvb_generic_release); 174 175 long dvb_generic_ioctl(struct file *file, 176 unsigned int cmd, unsigned long arg) 177 { 178 struct dvb_device *dvbdev = file->private_data; 179 180 if (!dvbdev) 181 return -ENODEV; 182 183 if (!dvbdev->kernel_ioctl) 184 return -EINVAL; 185 186 return dvb_usercopy(file, cmd, arg, dvbdev->kernel_ioctl); 187 } 188 EXPORT_SYMBOL(dvb_generic_ioctl); 189 190 static int dvbdev_get_free_id(struct dvb_adapter *adap, int type) 191 { 192 u32 id = 0; 193 194 while (id < DVB_MAX_IDS) { 195 struct dvb_device *dev; 196 197 list_for_each_entry(dev, &adap->device_list, list_head) 198 if (dev->type == type && dev->id == id) 199 goto skip; 200 return id; 201 skip: 202 id++; 203 } 204 return -ENFILE; 205 } 206 207 static void dvb_media_device_free(struct dvb_device *dvbdev) 208 { 209 #if defined(CONFIG_MEDIA_CONTROLLER_DVB) 210 if (dvbdev->entity) { 211 media_device_unregister_entity(dvbdev->entity); 212 kfree(dvbdev->entity); 213 kfree(dvbdev->pads); 214 dvbdev->entity = NULL; 215 dvbdev->pads = NULL; 216 } 217 218 if (dvbdev->tsout_entity) { 219 int i; 220 221 for (i = 0; i < dvbdev->tsout_num_entities; i++) { 222 media_device_unregister_entity(&dvbdev->tsout_entity[i]); 223 kfree(dvbdev->tsout_entity[i].name); 224 } 225 kfree(dvbdev->tsout_entity); 226 kfree(dvbdev->tsout_pads); 227 dvbdev->tsout_entity = NULL; 228 dvbdev->tsout_pads = NULL; 229 230 dvbdev->tsout_num_entities = 0; 231 } 232 233 if (dvbdev->intf_devnode) { 234 media_devnode_remove(dvbdev->intf_devnode); 235 dvbdev->intf_devnode = NULL; 236 } 237 238 if (dvbdev->adapter->conn) { 239 media_device_unregister_entity(dvbdev->adapter->conn); 240 kfree(dvbdev->adapter->conn); 241 dvbdev->adapter->conn = NULL; 242 kfree(dvbdev->adapter->conn_pads); 243 dvbdev->adapter->conn_pads = NULL; 244 } 245 #endif 246 } 247 248 #if defined(CONFIG_MEDIA_CONTROLLER_DVB) 249 static int dvb_create_tsout_entity(struct dvb_device *dvbdev, 250 const char *name, int npads) 251 { 252 int i; 253 254 dvbdev->tsout_pads = kzalloc_objs(*dvbdev->tsout_pads, npads); 255 if (!dvbdev->tsout_pads) 256 return -ENOMEM; 257 258 dvbdev->tsout_entity = kzalloc_objs(*dvbdev->tsout_entity, npads); 259 if (!dvbdev->tsout_entity) 260 return -ENOMEM; 261 262 dvbdev->tsout_num_entities = npads; 263 264 for (i = 0; i < npads; i++) { 265 struct media_pad *pads = &dvbdev->tsout_pads[i]; 266 struct media_entity *entity = &dvbdev->tsout_entity[i]; 267 int ret; 268 269 entity->name = kasprintf(GFP_KERNEL, "%s #%d", name, i); 270 if (!entity->name) 271 return -ENOMEM; 272 273 entity->function = MEDIA_ENT_F_IO_DTV; 274 pads->flags = MEDIA_PAD_FL_SINK; 275 276 ret = media_entity_pads_init(entity, 1, pads); 277 if (ret < 0) 278 return ret; 279 280 ret = media_device_register_entity(dvbdev->adapter->mdev, 281 entity); 282 if (ret < 0) 283 return ret; 284 } 285 return 0; 286 } 287 288 #define DEMUX_TSOUT "demux-tsout" 289 #define DVR_TSOUT "dvr-tsout" 290 291 static int dvb_create_media_entity(struct dvb_device *dvbdev, 292 int type, int demux_sink_pads) 293 { 294 int i, ret, npads; 295 296 switch (type) { 297 case DVB_DEVICE_FRONTEND: 298 npads = 2; 299 break; 300 case DVB_DEVICE_DVR: 301 ret = dvb_create_tsout_entity(dvbdev, DVR_TSOUT, 302 demux_sink_pads); 303 return ret; 304 case DVB_DEVICE_DEMUX: 305 npads = 1 + demux_sink_pads; 306 ret = dvb_create_tsout_entity(dvbdev, DEMUX_TSOUT, 307 demux_sink_pads); 308 if (ret < 0) 309 return ret; 310 break; 311 case DVB_DEVICE_CA: 312 npads = 2; 313 break; 314 case DVB_DEVICE_NET: 315 /* 316 * We should be creating entities for the MPE/ULE 317 * decapsulation hardware (or software implementation). 318 * 319 * However, the number of for the MPE/ULE decaps may not be 320 * fixed. As we don't have yet dynamic support for PADs at 321 * the Media Controller, let's not create the decap 322 * entities yet. 323 */ 324 return 0; 325 default: 326 return 0; 327 } 328 329 dvbdev->entity = kzalloc_obj(*dvbdev->entity); 330 if (!dvbdev->entity) 331 return -ENOMEM; 332 333 dvbdev->entity->name = dvbdev->name; 334 335 if (npads) { 336 dvbdev->pads = kzalloc_objs(*dvbdev->pads, npads); 337 if (!dvbdev->pads) { 338 kfree(dvbdev->entity); 339 dvbdev->entity = NULL; 340 return -ENOMEM; 341 } 342 } 343 344 switch (type) { 345 case DVB_DEVICE_FRONTEND: 346 dvbdev->entity->function = MEDIA_ENT_F_DTV_DEMOD; 347 dvbdev->pads[0].flags = MEDIA_PAD_FL_SINK; 348 dvbdev->pads[1].flags = MEDIA_PAD_FL_SOURCE; 349 break; 350 case DVB_DEVICE_DEMUX: 351 dvbdev->entity->function = MEDIA_ENT_F_TS_DEMUX; 352 dvbdev->pads[0].flags = MEDIA_PAD_FL_SINK; 353 for (i = 1; i < npads; i++) 354 dvbdev->pads[i].flags = MEDIA_PAD_FL_SOURCE; 355 break; 356 case DVB_DEVICE_CA: 357 dvbdev->entity->function = MEDIA_ENT_F_DTV_CA; 358 dvbdev->pads[0].flags = MEDIA_PAD_FL_SINK; 359 dvbdev->pads[1].flags = MEDIA_PAD_FL_SOURCE; 360 break; 361 default: 362 /* Should never happen, as the first switch prevents it */ 363 kfree(dvbdev->entity); 364 kfree(dvbdev->pads); 365 dvbdev->entity = NULL; 366 dvbdev->pads = NULL; 367 return 0; 368 } 369 370 if (npads) { 371 ret = media_entity_pads_init(dvbdev->entity, npads, dvbdev->pads); 372 if (ret) 373 return ret; 374 } 375 ret = media_device_register_entity(dvbdev->adapter->mdev, 376 dvbdev->entity); 377 if (ret) 378 return ret; 379 380 pr_info("%s: media entity '%s' registered.\n", 381 __func__, dvbdev->entity->name); 382 383 return 0; 384 } 385 #endif 386 387 static int dvb_register_media_device(struct dvb_device *dvbdev, 388 int type, int minor, 389 unsigned int demux_sink_pads) 390 { 391 #if defined(CONFIG_MEDIA_CONTROLLER_DVB) 392 struct media_link *link; 393 u32 intf_type; 394 int ret; 395 396 if (!dvbdev->adapter->mdev) 397 return 0; 398 399 ret = dvb_create_media_entity(dvbdev, type, demux_sink_pads); 400 if (ret) 401 return ret; 402 403 switch (type) { 404 case DVB_DEVICE_FRONTEND: 405 intf_type = MEDIA_INTF_T_DVB_FE; 406 break; 407 case DVB_DEVICE_DEMUX: 408 intf_type = MEDIA_INTF_T_DVB_DEMUX; 409 break; 410 case DVB_DEVICE_DVR: 411 intf_type = MEDIA_INTF_T_DVB_DVR; 412 break; 413 case DVB_DEVICE_CA: 414 intf_type = MEDIA_INTF_T_DVB_CA; 415 break; 416 case DVB_DEVICE_NET: 417 intf_type = MEDIA_INTF_T_DVB_NET; 418 break; 419 default: 420 return 0; 421 } 422 423 dvbdev->intf_devnode = media_devnode_create(dvbdev->adapter->mdev, 424 intf_type, 0, 425 DVB_MAJOR, minor); 426 427 if (!dvbdev->intf_devnode) 428 return -ENOMEM; 429 430 /* 431 * Create the "obvious" link, e. g. the ones that represent 432 * a direct association between an interface and an entity. 433 * Other links should be created elsewhere, like: 434 * DVB FE intf -> tuner 435 * DVB demux intf -> dvr 436 */ 437 438 if (!dvbdev->entity) 439 return 0; 440 441 link = media_create_intf_link(dvbdev->entity, 442 &dvbdev->intf_devnode->intf, 443 MEDIA_LNK_FL_ENABLED | 444 MEDIA_LNK_FL_IMMUTABLE); 445 if (!link) 446 return -ENOMEM; 447 #endif 448 return 0; 449 } 450 451 int dvb_register_device(struct dvb_adapter *adap, struct dvb_device **pdvbdev, 452 const struct dvb_device *template, void *priv, 453 enum dvb_device_type type, int demux_sink_pads) 454 { 455 struct dvb_device *dvbdev; 456 struct file_operations *dvbdevfops = NULL; 457 struct dvbdevfops_node *node = NULL, *new_node = NULL; 458 struct device *clsdev; 459 int minor; 460 int id, ret; 461 462 mutex_lock(&dvbdev_register_lock); 463 464 id = dvbdev_get_free_id(adap, type); 465 if (id < 0) { 466 mutex_unlock(&dvbdev_register_lock); 467 *pdvbdev = NULL; 468 pr_err("%s: couldn't find free device id\n", __func__); 469 return -ENFILE; 470 } 471 472 *pdvbdev = dvbdev = kzalloc_obj(*dvbdev); 473 if (!dvbdev) { 474 mutex_unlock(&dvbdev_register_lock); 475 return -ENOMEM; 476 } 477 478 /* 479 * When a device of the same type is probe()d more than once, 480 * the first allocated fops are used. This prevents memory leaks 481 * that can occur when the same device is probe()d repeatedly. 482 */ 483 list_for_each_entry(node, &dvbdevfops_list, list_head) { 484 if (node->fops->owner == adap->module && 485 node->type == type && node->template == template) { 486 dvbdevfops = node->fops; 487 break; 488 } 489 } 490 491 if (!dvbdevfops) { 492 dvbdevfops = kmemdup(template->fops, sizeof(*dvbdevfops), GFP_KERNEL); 493 if (!dvbdevfops) { 494 kfree(dvbdev); 495 *pdvbdev = NULL; 496 mutex_unlock(&dvbdev_register_lock); 497 return -ENOMEM; 498 } 499 500 new_node = kzalloc_obj(*new_node); 501 if (!new_node) { 502 kfree(dvbdevfops); 503 kfree(dvbdev); 504 *pdvbdev = NULL; 505 mutex_unlock(&dvbdev_register_lock); 506 return -ENOMEM; 507 } 508 509 new_node->fops = dvbdevfops; 510 new_node->type = type; 511 new_node->template = template; 512 list_add_tail(&new_node->list_head, &dvbdevfops_list); 513 } 514 515 memcpy(dvbdev, template, sizeof(struct dvb_device)); 516 kref_init(&dvbdev->ref); 517 dvbdev->type = type; 518 dvbdev->id = id; 519 dvbdev->adapter = adap; 520 dvbdev->priv = priv; 521 dvbdev->fops = dvbdevfops; 522 init_waitqueue_head(&dvbdev->wait_queue); 523 dvbdevfops->owner = adap->module; 524 list_add_tail(&dvbdev->list_head, &adap->device_list); 525 down_write(&minor_rwsem); 526 #ifdef CONFIG_DVB_DYNAMIC_MINORS 527 for (minor = 0; minor < MAX_DVB_MINORS; minor++) 528 if (!dvb_minors[minor]) 529 break; 530 #else 531 minor = nums2minor(adap->num, type, id); 532 #endif 533 if (minor >= MAX_DVB_MINORS) { 534 if (new_node) { 535 list_del(&new_node->list_head); 536 kfree(dvbdevfops); 537 kfree(new_node); 538 } 539 list_del(&dvbdev->list_head); 540 kfree(dvbdev); 541 *pdvbdev = NULL; 542 up_write(&minor_rwsem); 543 mutex_unlock(&dvbdev_register_lock); 544 return -EINVAL; 545 } 546 547 dvbdev->minor = minor; 548 dvb_minors[minor] = dvb_device_get(dvbdev); 549 up_write(&minor_rwsem); 550 ret = dvb_register_media_device(dvbdev, type, minor, demux_sink_pads); 551 if (ret) { 552 pr_err("%s: dvb_register_media_device failed to create the mediagraph\n", 553 __func__); 554 if (new_node) { 555 list_del(&new_node->list_head); 556 kfree(dvbdevfops); 557 kfree(new_node); 558 } 559 dvb_media_device_free(dvbdev); 560 list_del(&dvbdev->list_head); 561 kfree(dvbdev); 562 *pdvbdev = NULL; 563 mutex_unlock(&dvbdev_register_lock); 564 return ret; 565 } 566 567 clsdev = device_create(dvb_class, adap->device, 568 MKDEV(DVB_MAJOR, minor), 569 dvbdev, "dvb%d.%s%d", adap->num, dnames[type], id); 570 if (IS_ERR(clsdev)) { 571 pr_err("%s: failed to create device dvb%d.%s%d (%pe)\n", 572 __func__, adap->num, dnames[type], id, clsdev); 573 if (new_node) { 574 list_del(&new_node->list_head); 575 kfree(dvbdevfops); 576 kfree(new_node); 577 } 578 dvb_media_device_free(dvbdev); 579 list_del(&dvbdev->list_head); 580 kfree(dvbdev); 581 *pdvbdev = NULL; 582 mutex_unlock(&dvbdev_register_lock); 583 return PTR_ERR(clsdev); 584 } 585 586 dprintk("DVB: register adapter%d/%s%d @ minor: %i (0x%02x)\n", 587 adap->num, dnames[type], id, minor, minor); 588 589 mutex_unlock(&dvbdev_register_lock); 590 return 0; 591 } 592 EXPORT_SYMBOL(dvb_register_device); 593 594 void dvb_remove_device(struct dvb_device *dvbdev) 595 { 596 if (!dvbdev) 597 return; 598 599 down_write(&minor_rwsem); 600 dvb_minors[dvbdev->minor] = NULL; 601 dvb_device_put(dvbdev); 602 up_write(&minor_rwsem); 603 604 dvb_media_device_free(dvbdev); 605 606 device_destroy(dvb_class, MKDEV(DVB_MAJOR, dvbdev->minor)); 607 608 list_del(&dvbdev->list_head); 609 } 610 EXPORT_SYMBOL(dvb_remove_device); 611 612 static void dvb_free_device(struct kref *ref) 613 { 614 struct dvb_device *dvbdev = container_of(ref, struct dvb_device, ref); 615 616 kfree(dvbdev); 617 } 618 619 struct dvb_device *dvb_device_get(struct dvb_device *dvbdev) 620 { 621 kref_get(&dvbdev->ref); 622 return dvbdev; 623 } 624 EXPORT_SYMBOL(dvb_device_get); 625 626 void dvb_device_put(struct dvb_device *dvbdev) 627 { 628 if (dvbdev) 629 kref_put(&dvbdev->ref, dvb_free_device); 630 } 631 632 void dvb_unregister_device(struct dvb_device *dvbdev) 633 { 634 dvb_remove_device(dvbdev); 635 dvb_device_put(dvbdev); 636 } 637 EXPORT_SYMBOL(dvb_unregister_device); 638 639 #ifdef CONFIG_MEDIA_CONTROLLER_DVB 640 641 static int dvb_create_io_intf_links(struct dvb_adapter *adap, 642 struct media_interface *intf, 643 char *name) 644 { 645 struct media_device *mdev = adap->mdev; 646 struct media_entity *entity; 647 struct media_link *link; 648 649 media_device_for_each_entity(entity, mdev) { 650 if (entity->function == MEDIA_ENT_F_IO_DTV) { 651 if (strncmp(entity->name, name, strlen(name))) 652 continue; 653 link = media_create_intf_link(entity, intf, 654 MEDIA_LNK_FL_ENABLED | 655 MEDIA_LNK_FL_IMMUTABLE); 656 if (!link) 657 return -ENOMEM; 658 } 659 } 660 return 0; 661 } 662 663 int dvb_create_media_graph(struct dvb_adapter *adap, 664 bool create_rf_connector) 665 { 666 struct media_device *mdev = adap->mdev; 667 struct media_entity *entity, *tuner = NULL, *demod = NULL, *conn; 668 struct media_entity *demux = NULL, *ca = NULL; 669 struct media_link *link; 670 struct media_interface *intf; 671 unsigned int demux_pad = 0; 672 unsigned int dvr_pad = 0; 673 unsigned int ntuner = 0, ndemod = 0; 674 int ret, pad_source, pad_sink; 675 static const char *connector_name = "Television"; 676 677 if (!mdev) 678 return 0; 679 680 media_device_for_each_entity(entity, mdev) { 681 switch (entity->function) { 682 case MEDIA_ENT_F_TUNER: 683 tuner = entity; 684 ntuner++; 685 break; 686 case MEDIA_ENT_F_DTV_DEMOD: 687 demod = entity; 688 ndemod++; 689 break; 690 case MEDIA_ENT_F_TS_DEMUX: 691 demux = entity; 692 break; 693 case MEDIA_ENT_F_DTV_CA: 694 ca = entity; 695 break; 696 } 697 } 698 699 /* 700 * Prepare to signalize to media_create_pad_links() that multiple 701 * entities of the same type exists and a 1:n or n:1 links need to be 702 * created. 703 * NOTE: if both tuner and demod have multiple instances, it is up 704 * to the caller driver to create such links. 705 */ 706 if (ntuner > 1) 707 tuner = NULL; 708 if (ndemod > 1) 709 demod = NULL; 710 711 if (create_rf_connector) { 712 conn = kzalloc_obj(*conn); 713 if (!conn) 714 return -ENOMEM; 715 adap->conn = conn; 716 717 adap->conn_pads = kzalloc_obj(*adap->conn_pads); 718 if (!adap->conn_pads) 719 return -ENOMEM; 720 721 conn->flags = MEDIA_ENT_FL_CONNECTOR; 722 conn->function = MEDIA_ENT_F_CONN_RF; 723 conn->name = connector_name; 724 adap->conn_pads->flags = MEDIA_PAD_FL_SOURCE; 725 726 ret = media_entity_pads_init(conn, 1, adap->conn_pads); 727 if (ret) 728 return ret; 729 730 ret = media_device_register_entity(mdev, conn); 731 if (ret) 732 return ret; 733 734 if (!ntuner) { 735 ret = media_create_pad_links(mdev, 736 MEDIA_ENT_F_CONN_RF, 737 conn, 0, 738 MEDIA_ENT_F_DTV_DEMOD, 739 demod, 0, 740 MEDIA_LNK_FL_ENABLED, 741 false); 742 } else { 743 pad_sink = media_get_pad_index(tuner, MEDIA_PAD_FL_SINK, 744 PAD_SIGNAL_ANALOG); 745 if (pad_sink < 0) 746 return -EINVAL; 747 ret = media_create_pad_links(mdev, 748 MEDIA_ENT_F_CONN_RF, 749 conn, 0, 750 MEDIA_ENT_F_TUNER, 751 tuner, pad_sink, 752 MEDIA_LNK_FL_ENABLED, 753 false); 754 } 755 if (ret) 756 return ret; 757 } 758 759 if (ntuner && ndemod) { 760 /* NOTE: first found tuner source pad presumed correct */ 761 pad_source = media_get_pad_index(tuner, MEDIA_PAD_FL_SOURCE, 762 PAD_SIGNAL_ANALOG); 763 if (pad_source < 0) 764 return -EINVAL; 765 ret = media_create_pad_links(mdev, 766 MEDIA_ENT_F_TUNER, 767 tuner, pad_source, 768 MEDIA_ENT_F_DTV_DEMOD, 769 demod, 0, MEDIA_LNK_FL_ENABLED, 770 false); 771 if (ret) 772 return ret; 773 } 774 775 if (ndemod && demux) { 776 ret = media_create_pad_links(mdev, 777 MEDIA_ENT_F_DTV_DEMOD, 778 demod, 1, 779 MEDIA_ENT_F_TS_DEMUX, 780 demux, 0, MEDIA_LNK_FL_ENABLED, 781 false); 782 if (ret) 783 return ret; 784 } 785 if (demux && ca) { 786 ret = media_create_pad_link(demux, 1, ca, 787 0, MEDIA_LNK_FL_ENABLED); 788 if (ret) 789 return ret; 790 } 791 792 /* Create demux links for each ringbuffer/pad */ 793 if (demux) { 794 media_device_for_each_entity(entity, mdev) { 795 if (entity->function == MEDIA_ENT_F_IO_DTV) { 796 if (!strncmp(entity->name, DVR_TSOUT, 797 strlen(DVR_TSOUT))) { 798 ret = media_create_pad_link(demux, 799 ++dvr_pad, 800 entity, 0, 0); 801 if (ret) 802 return ret; 803 } 804 if (!strncmp(entity->name, DEMUX_TSOUT, 805 strlen(DEMUX_TSOUT))) { 806 ret = media_create_pad_link(demux, 807 ++demux_pad, 808 entity, 0, 0); 809 if (ret) 810 return ret; 811 } 812 } 813 } 814 } 815 816 /* Create interface links for FE->tuner, DVR->demux and CA->ca */ 817 media_device_for_each_intf(intf, mdev) { 818 if (intf->type == MEDIA_INTF_T_DVB_CA && ca) { 819 link = media_create_intf_link(ca, intf, 820 MEDIA_LNK_FL_ENABLED | 821 MEDIA_LNK_FL_IMMUTABLE); 822 if (!link) 823 return -ENOMEM; 824 } 825 826 if (intf->type == MEDIA_INTF_T_DVB_FE && tuner) { 827 link = media_create_intf_link(tuner, intf, 828 MEDIA_LNK_FL_ENABLED | 829 MEDIA_LNK_FL_IMMUTABLE); 830 if (!link) 831 return -ENOMEM; 832 } 833 #if 0 834 /* 835 * Indirect link - let's not create yet, as we don't know how 836 * to handle indirect links, nor if this will 837 * actually be needed. 838 */ 839 if (intf->type == MEDIA_INTF_T_DVB_DVR && demux) { 840 link = media_create_intf_link(demux, intf, 841 MEDIA_LNK_FL_ENABLED | 842 MEDIA_LNK_FL_IMMUTABLE); 843 if (!link) 844 return -ENOMEM; 845 } 846 #endif 847 if (intf->type == MEDIA_INTF_T_DVB_DVR) { 848 ret = dvb_create_io_intf_links(adap, intf, DVR_TSOUT); 849 if (ret) 850 return ret; 851 } 852 if (intf->type == MEDIA_INTF_T_DVB_DEMUX) { 853 ret = dvb_create_io_intf_links(adap, intf, DEMUX_TSOUT); 854 if (ret) 855 return ret; 856 } 857 } 858 return 0; 859 } 860 EXPORT_SYMBOL_GPL(dvb_create_media_graph); 861 #endif 862 863 static int dvbdev_check_free_adapter_num(int num) 864 { 865 struct list_head *entry; 866 867 list_for_each(entry, &dvb_adapter_list) { 868 struct dvb_adapter *adap; 869 870 adap = list_entry(entry, struct dvb_adapter, list_head); 871 if (adap->num == num) 872 return 0; 873 } 874 return 1; 875 } 876 877 static int dvbdev_get_free_adapter_num(void) 878 { 879 int num = 0; 880 881 while (num < DVB_MAX_ADAPTERS) { 882 if (dvbdev_check_free_adapter_num(num)) 883 return num; 884 num++; 885 } 886 887 return -ENFILE; 888 } 889 890 int dvb_register_adapter(struct dvb_adapter *adap, const char *name, 891 struct module *module, struct device *device, 892 short *adapter_nums) 893 { 894 int i, num; 895 896 mutex_lock(&dvbdev_register_lock); 897 898 for (i = 0; i < DVB_MAX_ADAPTERS; ++i) { 899 num = adapter_nums[i]; 900 if (num >= 0 && num < DVB_MAX_ADAPTERS) { 901 /* use the one the driver asked for */ 902 if (dvbdev_check_free_adapter_num(num)) 903 break; 904 } else { 905 num = dvbdev_get_free_adapter_num(); 906 break; 907 } 908 num = -1; 909 } 910 911 if (num < 0) { 912 mutex_unlock(&dvbdev_register_lock); 913 return -ENFILE; 914 } 915 916 memset(adap, 0, sizeof(struct dvb_adapter)); 917 INIT_LIST_HEAD(&adap->device_list); 918 919 pr_info("DVB: registering new adapter (%s)\n", name); 920 921 adap->num = num; 922 adap->name = name; 923 adap->module = module; 924 adap->device = device; 925 adap->mfe_shared = 0; 926 adap->mfe_dvbdev = NULL; 927 mutex_init(&adap->mfe_lock); 928 929 #ifdef CONFIG_MEDIA_CONTROLLER_DVB 930 mutex_init(&adap->mdev_lock); 931 #endif 932 933 list_add_tail(&adap->list_head, &dvb_adapter_list); 934 935 mutex_unlock(&dvbdev_register_lock); 936 937 return num; 938 } 939 EXPORT_SYMBOL(dvb_register_adapter); 940 941 int dvb_unregister_adapter(struct dvb_adapter *adap) 942 { 943 mutex_lock(&dvbdev_register_lock); 944 list_del(&adap->list_head); 945 mutex_unlock(&dvbdev_register_lock); 946 return 0; 947 } 948 EXPORT_SYMBOL(dvb_unregister_adapter); 949 950 /* 951 * if the miracle happens and "generic_usercopy()" is included into 952 * the kernel, then this can vanish. please don't make the mistake and 953 * define this as video_usercopy(). this will introduce a dependency 954 * to the v4l "videodev.o" module, which is unnecessary for some 955 * cards (ie. the budget dvb-cards don't need the v4l module...) 956 */ 957 int dvb_usercopy(struct file *file, 958 unsigned int cmd, unsigned long arg, 959 int (*func)(struct file *file, 960 unsigned int cmd, void *arg)) 961 { 962 char sbuf[128] = {}; 963 void *mbuf = NULL; 964 void *parg = NULL; 965 int err = -EINVAL; 966 967 /* Copy arguments into temp kernel buffer */ 968 switch (_IOC_DIR(cmd)) { 969 case _IOC_NONE: 970 /* 971 * For this command, the pointer is actually an integer 972 * argument. 973 */ 974 parg = (void *)arg; 975 break; 976 case _IOC_READ: /* some v4l ioctls are marked wrong ... */ 977 case _IOC_WRITE: 978 case (_IOC_WRITE | _IOC_READ): 979 if (_IOC_SIZE(cmd) <= sizeof(sbuf)) { 980 parg = sbuf; 981 } else { 982 /* too big to allocate from stack */ 983 mbuf = kmalloc(_IOC_SIZE(cmd), GFP_KERNEL); 984 if (!mbuf) 985 return -ENOMEM; 986 parg = mbuf; 987 } 988 989 err = -EFAULT; 990 if (copy_from_user(parg, (void __user *)arg, _IOC_SIZE(cmd))) 991 goto out; 992 break; 993 } 994 995 /* call driver */ 996 err = func(file, cmd, parg); 997 if (err == -ENOIOCTLCMD) 998 err = -ENOTTY; 999 1000 if (err < 0) 1001 goto out; 1002 1003 /* Copy results into user buffer */ 1004 switch (_IOC_DIR(cmd)) { 1005 case _IOC_READ: 1006 case (_IOC_WRITE | _IOC_READ): 1007 if (copy_to_user((void __user *)arg, parg, _IOC_SIZE(cmd))) 1008 err = -EFAULT; 1009 break; 1010 } 1011 1012 out: 1013 kfree(mbuf); 1014 return err; 1015 } 1016 1017 #if IS_ENABLED(CONFIG_I2C) 1018 struct i2c_client *dvb_module_probe(const char *module_name, 1019 const char *name, 1020 struct i2c_adapter *adap, 1021 unsigned char addr, 1022 void *platform_data) 1023 { 1024 struct i2c_client *client; 1025 struct i2c_board_info *board_info; 1026 1027 board_info = kzalloc_obj(*board_info); 1028 if (!board_info) 1029 return NULL; 1030 1031 if (name) 1032 strscpy(board_info->type, name, I2C_NAME_SIZE); 1033 else 1034 strscpy(board_info->type, module_name, I2C_NAME_SIZE); 1035 1036 board_info->addr = addr; 1037 board_info->platform_data = platform_data; 1038 request_module(module_name); 1039 client = i2c_new_client_device(adap, board_info); 1040 if (!i2c_client_has_driver(client)) { 1041 kfree(board_info); 1042 return NULL; 1043 } 1044 1045 if (!try_module_get(client->dev.driver->owner)) { 1046 i2c_unregister_device(client); 1047 client = NULL; 1048 } 1049 1050 kfree(board_info); 1051 return client; 1052 } 1053 EXPORT_SYMBOL_GPL(dvb_module_probe); 1054 1055 void dvb_module_release(struct i2c_client *client) 1056 { 1057 if (!client) 1058 return; 1059 1060 module_put(client->dev.driver->owner); 1061 i2c_unregister_device(client); 1062 } 1063 EXPORT_SYMBOL_GPL(dvb_module_release); 1064 #endif 1065 1066 static int dvb_uevent(const struct device *dev, struct kobj_uevent_env *env) 1067 { 1068 const struct dvb_device *dvbdev = dev_get_drvdata(dev); 1069 1070 add_uevent_var(env, "DVB_ADAPTER_NUM=%d", dvbdev->adapter->num); 1071 add_uevent_var(env, "DVB_DEVICE_TYPE=%s", dnames[dvbdev->type]); 1072 add_uevent_var(env, "DVB_DEVICE_NUM=%d", dvbdev->id); 1073 return 0; 1074 } 1075 1076 static char *dvb_devnode(const struct device *dev, umode_t *mode) 1077 { 1078 const struct dvb_device *dvbdev = dev_get_drvdata(dev); 1079 1080 return kasprintf(GFP_KERNEL, "dvb/adapter%d/%s%d", 1081 dvbdev->adapter->num, dnames[dvbdev->type], dvbdev->id); 1082 } 1083 1084 static int __init init_dvbdev(void) 1085 { 1086 int retval; 1087 dev_t dev = MKDEV(DVB_MAJOR, 0); 1088 1089 retval = register_chrdev_region(dev, MAX_DVB_MINORS, "DVB"); 1090 if (retval != 0) { 1091 pr_err("dvb-core: unable to get major %d\n", DVB_MAJOR); 1092 return retval; 1093 } 1094 1095 cdev_init(&dvb_device_cdev, &dvb_device_fops); 1096 retval = cdev_add(&dvb_device_cdev, dev, MAX_DVB_MINORS); 1097 if (retval != 0) { 1098 pr_err("dvb-core: unable register character device\n"); 1099 goto error; 1100 } 1101 1102 dvb_class = class_create("dvb"); 1103 if (IS_ERR(dvb_class)) { 1104 retval = PTR_ERR(dvb_class); 1105 goto error; 1106 } 1107 dvb_class->dev_uevent = dvb_uevent; 1108 dvb_class->devnode = dvb_devnode; 1109 return 0; 1110 1111 error: 1112 cdev_del(&dvb_device_cdev); 1113 unregister_chrdev_region(dev, MAX_DVB_MINORS); 1114 return retval; 1115 } 1116 1117 static void __exit exit_dvbdev(void) 1118 { 1119 struct dvbdevfops_node *node, *next; 1120 1121 class_destroy(dvb_class); 1122 cdev_del(&dvb_device_cdev); 1123 unregister_chrdev_region(MKDEV(DVB_MAJOR, 0), MAX_DVB_MINORS); 1124 1125 list_for_each_entry_safe(node, next, &dvbdevfops_list, list_head) { 1126 list_del(&node->list_head); 1127 kfree(node->fops); 1128 kfree(node); 1129 } 1130 } 1131 1132 subsys_initcall(init_dvbdev); 1133 module_exit(exit_dvbdev); 1134 1135 MODULE_DESCRIPTION("DVB Core Driver"); 1136 MODULE_AUTHOR("Marcus Metzler, Ralph Metzler, Holger Waechtler"); 1137 MODULE_LICENSE("GPL"); 1138