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