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 GFP_KERNEL); 256 if (!dvbdev->tsout_pads) 257 return -ENOMEM; 258 259 dvbdev->tsout_entity = kzalloc_objs(*dvbdev->tsout_entity, npads, 260 GFP_KERNEL); 261 if (!dvbdev->tsout_entity) 262 return -ENOMEM; 263 264 dvbdev->tsout_num_entities = npads; 265 266 for (i = 0; i < npads; i++) { 267 struct media_pad *pads = &dvbdev->tsout_pads[i]; 268 struct media_entity *entity = &dvbdev->tsout_entity[i]; 269 int ret; 270 271 entity->name = kasprintf(GFP_KERNEL, "%s #%d", name, i); 272 if (!entity->name) 273 return -ENOMEM; 274 275 entity->function = MEDIA_ENT_F_IO_DTV; 276 pads->flags = MEDIA_PAD_FL_SINK; 277 278 ret = media_entity_pads_init(entity, 1, pads); 279 if (ret < 0) 280 return ret; 281 282 ret = media_device_register_entity(dvbdev->adapter->mdev, 283 entity); 284 if (ret < 0) 285 return ret; 286 } 287 return 0; 288 } 289 290 #define DEMUX_TSOUT "demux-tsout" 291 #define DVR_TSOUT "dvr-tsout" 292 293 static int dvb_create_media_entity(struct dvb_device *dvbdev, 294 int type, int demux_sink_pads) 295 { 296 int i, ret, npads; 297 298 switch (type) { 299 case DVB_DEVICE_FRONTEND: 300 npads = 2; 301 break; 302 case DVB_DEVICE_DVR: 303 ret = dvb_create_tsout_entity(dvbdev, DVR_TSOUT, 304 demux_sink_pads); 305 return ret; 306 case DVB_DEVICE_DEMUX: 307 npads = 1 + demux_sink_pads; 308 ret = dvb_create_tsout_entity(dvbdev, DEMUX_TSOUT, 309 demux_sink_pads); 310 if (ret < 0) 311 return ret; 312 break; 313 case DVB_DEVICE_CA: 314 npads = 2; 315 break; 316 case DVB_DEVICE_NET: 317 /* 318 * We should be creating entities for the MPE/ULE 319 * decapsulation hardware (or software implementation). 320 * 321 * However, the number of for the MPE/ULE decaps may not be 322 * fixed. As we don't have yet dynamic support for PADs at 323 * the Media Controller, let's not create the decap 324 * entities yet. 325 */ 326 return 0; 327 default: 328 return 0; 329 } 330 331 dvbdev->entity = kzalloc_obj(*dvbdev->entity, GFP_KERNEL); 332 if (!dvbdev->entity) 333 return -ENOMEM; 334 335 dvbdev->entity->name = dvbdev->name; 336 337 if (npads) { 338 dvbdev->pads = kzalloc_objs(*dvbdev->pads, npads, GFP_KERNEL); 339 if (!dvbdev->pads) { 340 kfree(dvbdev->entity); 341 dvbdev->entity = NULL; 342 return -ENOMEM; 343 } 344 } 345 346 switch (type) { 347 case DVB_DEVICE_FRONTEND: 348 dvbdev->entity->function = MEDIA_ENT_F_DTV_DEMOD; 349 dvbdev->pads[0].flags = MEDIA_PAD_FL_SINK; 350 dvbdev->pads[1].flags = MEDIA_PAD_FL_SOURCE; 351 break; 352 case DVB_DEVICE_DEMUX: 353 dvbdev->entity->function = MEDIA_ENT_F_TS_DEMUX; 354 dvbdev->pads[0].flags = MEDIA_PAD_FL_SINK; 355 for (i = 1; i < npads; i++) 356 dvbdev->pads[i].flags = MEDIA_PAD_FL_SOURCE; 357 break; 358 case DVB_DEVICE_CA: 359 dvbdev->entity->function = MEDIA_ENT_F_DTV_CA; 360 dvbdev->pads[0].flags = MEDIA_PAD_FL_SINK; 361 dvbdev->pads[1].flags = MEDIA_PAD_FL_SOURCE; 362 break; 363 default: 364 /* Should never happen, as the first switch prevents it */ 365 kfree(dvbdev->entity); 366 kfree(dvbdev->pads); 367 dvbdev->entity = NULL; 368 dvbdev->pads = NULL; 369 return 0; 370 } 371 372 if (npads) { 373 ret = media_entity_pads_init(dvbdev->entity, npads, dvbdev->pads); 374 if (ret) 375 return ret; 376 } 377 ret = media_device_register_entity(dvbdev->adapter->mdev, 378 dvbdev->entity); 379 if (ret) 380 return ret; 381 382 pr_info("%s: media entity '%s' registered.\n", 383 __func__, dvbdev->entity->name); 384 385 return 0; 386 } 387 #endif 388 389 static int dvb_register_media_device(struct dvb_device *dvbdev, 390 int type, int minor, 391 unsigned int demux_sink_pads) 392 { 393 #if defined(CONFIG_MEDIA_CONTROLLER_DVB) 394 struct media_link *link; 395 u32 intf_type; 396 int ret; 397 398 if (!dvbdev->adapter->mdev) 399 return 0; 400 401 ret = dvb_create_media_entity(dvbdev, type, demux_sink_pads); 402 if (ret) 403 return ret; 404 405 switch (type) { 406 case DVB_DEVICE_FRONTEND: 407 intf_type = MEDIA_INTF_T_DVB_FE; 408 break; 409 case DVB_DEVICE_DEMUX: 410 intf_type = MEDIA_INTF_T_DVB_DEMUX; 411 break; 412 case DVB_DEVICE_DVR: 413 intf_type = MEDIA_INTF_T_DVB_DVR; 414 break; 415 case DVB_DEVICE_CA: 416 intf_type = MEDIA_INTF_T_DVB_CA; 417 break; 418 case DVB_DEVICE_NET: 419 intf_type = MEDIA_INTF_T_DVB_NET; 420 break; 421 default: 422 return 0; 423 } 424 425 dvbdev->intf_devnode = media_devnode_create(dvbdev->adapter->mdev, 426 intf_type, 0, 427 DVB_MAJOR, minor); 428 429 if (!dvbdev->intf_devnode) 430 return -ENOMEM; 431 432 /* 433 * Create the "obvious" link, e. g. the ones that represent 434 * a direct association between an interface and an entity. 435 * Other links should be created elsewhere, like: 436 * DVB FE intf -> tuner 437 * DVB demux intf -> dvr 438 */ 439 440 if (!dvbdev->entity) 441 return 0; 442 443 link = media_create_intf_link(dvbdev->entity, 444 &dvbdev->intf_devnode->intf, 445 MEDIA_LNK_FL_ENABLED | 446 MEDIA_LNK_FL_IMMUTABLE); 447 if (!link) 448 return -ENOMEM; 449 #endif 450 return 0; 451 } 452 453 int dvb_register_device(struct dvb_adapter *adap, struct dvb_device **pdvbdev, 454 const struct dvb_device *template, void *priv, 455 enum dvb_device_type type, int demux_sink_pads) 456 { 457 struct dvb_device *dvbdev; 458 struct file_operations *dvbdevfops = NULL; 459 struct dvbdevfops_node *node = NULL, *new_node = NULL; 460 struct device *clsdev; 461 int minor; 462 int id, ret; 463 464 mutex_lock(&dvbdev_register_lock); 465 466 id = dvbdev_get_free_id(adap, type); 467 if (id < 0) { 468 mutex_unlock(&dvbdev_register_lock); 469 *pdvbdev = NULL; 470 pr_err("%s: couldn't find free device id\n", __func__); 471 return -ENFILE; 472 } 473 474 *pdvbdev = dvbdev = kzalloc_obj(*dvbdev, GFP_KERNEL); 475 if (!dvbdev) { 476 mutex_unlock(&dvbdev_register_lock); 477 return -ENOMEM; 478 } 479 480 /* 481 * When a device of the same type is probe()d more than once, 482 * the first allocated fops are used. This prevents memory leaks 483 * that can occur when the same device is probe()d repeatedly. 484 */ 485 list_for_each_entry(node, &dvbdevfops_list, list_head) { 486 if (node->fops->owner == adap->module && 487 node->type == type && node->template == template) { 488 dvbdevfops = node->fops; 489 break; 490 } 491 } 492 493 if (!dvbdevfops) { 494 dvbdevfops = kmemdup(template->fops, sizeof(*dvbdevfops), GFP_KERNEL); 495 if (!dvbdevfops) { 496 kfree(dvbdev); 497 *pdvbdev = NULL; 498 mutex_unlock(&dvbdev_register_lock); 499 return -ENOMEM; 500 } 501 502 new_node = kzalloc_obj(*new_node, GFP_KERNEL); 503 if (!new_node) { 504 kfree(dvbdevfops); 505 kfree(dvbdev); 506 *pdvbdev = NULL; 507 mutex_unlock(&dvbdev_register_lock); 508 return -ENOMEM; 509 } 510 511 new_node->fops = dvbdevfops; 512 new_node->type = type; 513 new_node->template = template; 514 list_add_tail(&new_node->list_head, &dvbdevfops_list); 515 } 516 517 memcpy(dvbdev, template, sizeof(struct dvb_device)); 518 kref_init(&dvbdev->ref); 519 dvbdev->type = type; 520 dvbdev->id = id; 521 dvbdev->adapter = adap; 522 dvbdev->priv = priv; 523 dvbdev->fops = dvbdevfops; 524 init_waitqueue_head(&dvbdev->wait_queue); 525 dvbdevfops->owner = adap->module; 526 list_add_tail(&dvbdev->list_head, &adap->device_list); 527 down_write(&minor_rwsem); 528 #ifdef CONFIG_DVB_DYNAMIC_MINORS 529 for (minor = 0; minor < MAX_DVB_MINORS; minor++) 530 if (!dvb_minors[minor]) 531 break; 532 #else 533 minor = nums2minor(adap->num, type, id); 534 #endif 535 if (minor >= MAX_DVB_MINORS) { 536 if (new_node) { 537 list_del(&new_node->list_head); 538 kfree(dvbdevfops); 539 kfree(new_node); 540 } 541 list_del(&dvbdev->list_head); 542 kfree(dvbdev); 543 *pdvbdev = NULL; 544 up_write(&minor_rwsem); 545 mutex_unlock(&dvbdev_register_lock); 546 return -EINVAL; 547 } 548 549 dvbdev->minor = minor; 550 dvb_minors[minor] = dvb_device_get(dvbdev); 551 up_write(&minor_rwsem); 552 ret = dvb_register_media_device(dvbdev, type, minor, demux_sink_pads); 553 if (ret) { 554 pr_err("%s: dvb_register_media_device failed to create the mediagraph\n", 555 __func__); 556 if (new_node) { 557 list_del(&new_node->list_head); 558 kfree(dvbdevfops); 559 kfree(new_node); 560 } 561 dvb_media_device_free(dvbdev); 562 list_del(&dvbdev->list_head); 563 kfree(dvbdev); 564 *pdvbdev = NULL; 565 mutex_unlock(&dvbdev_register_lock); 566 return ret; 567 } 568 569 clsdev = device_create(dvb_class, adap->device, 570 MKDEV(DVB_MAJOR, minor), 571 dvbdev, "dvb%d.%s%d", adap->num, dnames[type], id); 572 if (IS_ERR(clsdev)) { 573 pr_err("%s: failed to create device dvb%d.%s%d (%pe)\n", 574 __func__, adap->num, dnames[type], id, clsdev); 575 if (new_node) { 576 list_del(&new_node->list_head); 577 kfree(dvbdevfops); 578 kfree(new_node); 579 } 580 dvb_media_device_free(dvbdev); 581 list_del(&dvbdev->list_head); 582 kfree(dvbdev); 583 *pdvbdev = NULL; 584 mutex_unlock(&dvbdev_register_lock); 585 return PTR_ERR(clsdev); 586 } 587 588 dprintk("DVB: register adapter%d/%s%d @ minor: %i (0x%02x)\n", 589 adap->num, dnames[type], id, minor, minor); 590 591 mutex_unlock(&dvbdev_register_lock); 592 return 0; 593 } 594 EXPORT_SYMBOL(dvb_register_device); 595 596 void dvb_remove_device(struct dvb_device *dvbdev) 597 { 598 if (!dvbdev) 599 return; 600 601 down_write(&minor_rwsem); 602 dvb_minors[dvbdev->minor] = NULL; 603 dvb_device_put(dvbdev); 604 up_write(&minor_rwsem); 605 606 dvb_media_device_free(dvbdev); 607 608 device_destroy(dvb_class, MKDEV(DVB_MAJOR, dvbdev->minor)); 609 610 list_del(&dvbdev->list_head); 611 } 612 EXPORT_SYMBOL(dvb_remove_device); 613 614 static void dvb_free_device(struct kref *ref) 615 { 616 struct dvb_device *dvbdev = container_of(ref, struct dvb_device, ref); 617 618 kfree(dvbdev); 619 } 620 621 struct dvb_device *dvb_device_get(struct dvb_device *dvbdev) 622 { 623 kref_get(&dvbdev->ref); 624 return dvbdev; 625 } 626 EXPORT_SYMBOL(dvb_device_get); 627 628 void dvb_device_put(struct dvb_device *dvbdev) 629 { 630 if (dvbdev) 631 kref_put(&dvbdev->ref, dvb_free_device); 632 } 633 634 void dvb_unregister_device(struct dvb_device *dvbdev) 635 { 636 dvb_remove_device(dvbdev); 637 dvb_device_put(dvbdev); 638 } 639 EXPORT_SYMBOL(dvb_unregister_device); 640 641 #ifdef CONFIG_MEDIA_CONTROLLER_DVB 642 643 static int dvb_create_io_intf_links(struct dvb_adapter *adap, 644 struct media_interface *intf, 645 char *name) 646 { 647 struct media_device *mdev = adap->mdev; 648 struct media_entity *entity; 649 struct media_link *link; 650 651 media_device_for_each_entity(entity, mdev) { 652 if (entity->function == MEDIA_ENT_F_IO_DTV) { 653 if (strncmp(entity->name, name, strlen(name))) 654 continue; 655 link = media_create_intf_link(entity, intf, 656 MEDIA_LNK_FL_ENABLED | 657 MEDIA_LNK_FL_IMMUTABLE); 658 if (!link) 659 return -ENOMEM; 660 } 661 } 662 return 0; 663 } 664 665 int dvb_create_media_graph(struct dvb_adapter *adap, 666 bool create_rf_connector) 667 { 668 struct media_device *mdev = adap->mdev; 669 struct media_entity *entity, *tuner = NULL, *demod = NULL, *conn; 670 struct media_entity *demux = NULL, *ca = NULL; 671 struct media_link *link; 672 struct media_interface *intf; 673 unsigned int demux_pad = 0; 674 unsigned int dvr_pad = 0; 675 unsigned int ntuner = 0, ndemod = 0; 676 int ret, pad_source, pad_sink; 677 static const char *connector_name = "Television"; 678 679 if (!mdev) 680 return 0; 681 682 media_device_for_each_entity(entity, mdev) { 683 switch (entity->function) { 684 case MEDIA_ENT_F_TUNER: 685 tuner = entity; 686 ntuner++; 687 break; 688 case MEDIA_ENT_F_DTV_DEMOD: 689 demod = entity; 690 ndemod++; 691 break; 692 case MEDIA_ENT_F_TS_DEMUX: 693 demux = entity; 694 break; 695 case MEDIA_ENT_F_DTV_CA: 696 ca = entity; 697 break; 698 } 699 } 700 701 /* 702 * Prepare to signalize to media_create_pad_links() that multiple 703 * entities of the same type exists and a 1:n or n:1 links need to be 704 * created. 705 * NOTE: if both tuner and demod have multiple instances, it is up 706 * to the caller driver to create such links. 707 */ 708 if (ntuner > 1) 709 tuner = NULL; 710 if (ndemod > 1) 711 demod = NULL; 712 713 if (create_rf_connector) { 714 conn = kzalloc_obj(*conn, GFP_KERNEL); 715 if (!conn) 716 return -ENOMEM; 717 adap->conn = conn; 718 719 adap->conn_pads = kzalloc_obj(*adap->conn_pads, GFP_KERNEL); 720 if (!adap->conn_pads) 721 return -ENOMEM; 722 723 conn->flags = MEDIA_ENT_FL_CONNECTOR; 724 conn->function = MEDIA_ENT_F_CONN_RF; 725 conn->name = connector_name; 726 adap->conn_pads->flags = MEDIA_PAD_FL_SOURCE; 727 728 ret = media_entity_pads_init(conn, 1, adap->conn_pads); 729 if (ret) 730 return ret; 731 732 ret = media_device_register_entity(mdev, conn); 733 if (ret) 734 return ret; 735 736 if (!ntuner) { 737 ret = media_create_pad_links(mdev, 738 MEDIA_ENT_F_CONN_RF, 739 conn, 0, 740 MEDIA_ENT_F_DTV_DEMOD, 741 demod, 0, 742 MEDIA_LNK_FL_ENABLED, 743 false); 744 } else { 745 pad_sink = media_get_pad_index(tuner, MEDIA_PAD_FL_SINK, 746 PAD_SIGNAL_ANALOG); 747 if (pad_sink < 0) 748 return -EINVAL; 749 ret = media_create_pad_links(mdev, 750 MEDIA_ENT_F_CONN_RF, 751 conn, 0, 752 MEDIA_ENT_F_TUNER, 753 tuner, pad_sink, 754 MEDIA_LNK_FL_ENABLED, 755 false); 756 } 757 if (ret) 758 return ret; 759 } 760 761 if (ntuner && ndemod) { 762 /* NOTE: first found tuner source pad presumed correct */ 763 pad_source = media_get_pad_index(tuner, MEDIA_PAD_FL_SOURCE, 764 PAD_SIGNAL_ANALOG); 765 if (pad_source < 0) 766 return -EINVAL; 767 ret = media_create_pad_links(mdev, 768 MEDIA_ENT_F_TUNER, 769 tuner, pad_source, 770 MEDIA_ENT_F_DTV_DEMOD, 771 demod, 0, MEDIA_LNK_FL_ENABLED, 772 false); 773 if (ret) 774 return ret; 775 } 776 777 if (ndemod && demux) { 778 ret = media_create_pad_links(mdev, 779 MEDIA_ENT_F_DTV_DEMOD, 780 demod, 1, 781 MEDIA_ENT_F_TS_DEMUX, 782 demux, 0, MEDIA_LNK_FL_ENABLED, 783 false); 784 if (ret) 785 return ret; 786 } 787 if (demux && ca) { 788 ret = media_create_pad_link(demux, 1, ca, 789 0, MEDIA_LNK_FL_ENABLED); 790 if (ret) 791 return ret; 792 } 793 794 /* Create demux links for each ringbuffer/pad */ 795 if (demux) { 796 media_device_for_each_entity(entity, mdev) { 797 if (entity->function == MEDIA_ENT_F_IO_DTV) { 798 if (!strncmp(entity->name, DVR_TSOUT, 799 strlen(DVR_TSOUT))) { 800 ret = media_create_pad_link(demux, 801 ++dvr_pad, 802 entity, 0, 0); 803 if (ret) 804 return ret; 805 } 806 if (!strncmp(entity->name, DEMUX_TSOUT, 807 strlen(DEMUX_TSOUT))) { 808 ret = media_create_pad_link(demux, 809 ++demux_pad, 810 entity, 0, 0); 811 if (ret) 812 return ret; 813 } 814 } 815 } 816 } 817 818 /* Create interface links for FE->tuner, DVR->demux and CA->ca */ 819 media_device_for_each_intf(intf, mdev) { 820 if (intf->type == MEDIA_INTF_T_DVB_CA && ca) { 821 link = media_create_intf_link(ca, intf, 822 MEDIA_LNK_FL_ENABLED | 823 MEDIA_LNK_FL_IMMUTABLE); 824 if (!link) 825 return -ENOMEM; 826 } 827 828 if (intf->type == MEDIA_INTF_T_DVB_FE && tuner) { 829 link = media_create_intf_link(tuner, intf, 830 MEDIA_LNK_FL_ENABLED | 831 MEDIA_LNK_FL_IMMUTABLE); 832 if (!link) 833 return -ENOMEM; 834 } 835 #if 0 836 /* 837 * Indirect link - let's not create yet, as we don't know how 838 * to handle indirect links, nor if this will 839 * actually be needed. 840 */ 841 if (intf->type == MEDIA_INTF_T_DVB_DVR && demux) { 842 link = media_create_intf_link(demux, intf, 843 MEDIA_LNK_FL_ENABLED | 844 MEDIA_LNK_FL_IMMUTABLE); 845 if (!link) 846 return -ENOMEM; 847 } 848 #endif 849 if (intf->type == MEDIA_INTF_T_DVB_DVR) { 850 ret = dvb_create_io_intf_links(adap, intf, DVR_TSOUT); 851 if (ret) 852 return ret; 853 } 854 if (intf->type == MEDIA_INTF_T_DVB_DEMUX) { 855 ret = dvb_create_io_intf_links(adap, intf, DEMUX_TSOUT); 856 if (ret) 857 return ret; 858 } 859 } 860 return 0; 861 } 862 EXPORT_SYMBOL_GPL(dvb_create_media_graph); 863 #endif 864 865 static int dvbdev_check_free_adapter_num(int num) 866 { 867 struct list_head *entry; 868 869 list_for_each(entry, &dvb_adapter_list) { 870 struct dvb_adapter *adap; 871 872 adap = list_entry(entry, struct dvb_adapter, list_head); 873 if (adap->num == num) 874 return 0; 875 } 876 return 1; 877 } 878 879 static int dvbdev_get_free_adapter_num(void) 880 { 881 int num = 0; 882 883 while (num < DVB_MAX_ADAPTERS) { 884 if (dvbdev_check_free_adapter_num(num)) 885 return num; 886 num++; 887 } 888 889 return -ENFILE; 890 } 891 892 int dvb_register_adapter(struct dvb_adapter *adap, const char *name, 893 struct module *module, struct device *device, 894 short *adapter_nums) 895 { 896 int i, num; 897 898 mutex_lock(&dvbdev_register_lock); 899 900 for (i = 0; i < DVB_MAX_ADAPTERS; ++i) { 901 num = adapter_nums[i]; 902 if (num >= 0 && num < DVB_MAX_ADAPTERS) { 903 /* use the one the driver asked for */ 904 if (dvbdev_check_free_adapter_num(num)) 905 break; 906 } else { 907 num = dvbdev_get_free_adapter_num(); 908 break; 909 } 910 num = -1; 911 } 912 913 if (num < 0) { 914 mutex_unlock(&dvbdev_register_lock); 915 return -ENFILE; 916 } 917 918 memset(adap, 0, sizeof(struct dvb_adapter)); 919 INIT_LIST_HEAD(&adap->device_list); 920 921 pr_info("DVB: registering new adapter (%s)\n", name); 922 923 adap->num = num; 924 adap->name = name; 925 adap->module = module; 926 adap->device = device; 927 adap->mfe_shared = 0; 928 adap->mfe_dvbdev = NULL; 929 mutex_init(&adap->mfe_lock); 930 931 #ifdef CONFIG_MEDIA_CONTROLLER_DVB 932 mutex_init(&adap->mdev_lock); 933 #endif 934 935 list_add_tail(&adap->list_head, &dvb_adapter_list); 936 937 mutex_unlock(&dvbdev_register_lock); 938 939 return num; 940 } 941 EXPORT_SYMBOL(dvb_register_adapter); 942 943 int dvb_unregister_adapter(struct dvb_adapter *adap) 944 { 945 mutex_lock(&dvbdev_register_lock); 946 list_del(&adap->list_head); 947 mutex_unlock(&dvbdev_register_lock); 948 return 0; 949 } 950 EXPORT_SYMBOL(dvb_unregister_adapter); 951 952 /* 953 * if the miracle happens and "generic_usercopy()" is included into 954 * the kernel, then this can vanish. please don't make the mistake and 955 * define this as video_usercopy(). this will introduce a dependency 956 * to the v4l "videodev.o" module, which is unnecessary for some 957 * cards (ie. the budget dvb-cards don't need the v4l module...) 958 */ 959 int dvb_usercopy(struct file *file, 960 unsigned int cmd, unsigned long arg, 961 int (*func)(struct file *file, 962 unsigned int cmd, void *arg)) 963 { 964 char sbuf[128] = {}; 965 void *mbuf = NULL; 966 void *parg = NULL; 967 int err = -EINVAL; 968 969 /* Copy arguments into temp kernel buffer */ 970 switch (_IOC_DIR(cmd)) { 971 case _IOC_NONE: 972 /* 973 * For this command, the pointer is actually an integer 974 * argument. 975 */ 976 parg = (void *)arg; 977 break; 978 case _IOC_READ: /* some v4l ioctls are marked wrong ... */ 979 case _IOC_WRITE: 980 case (_IOC_WRITE | _IOC_READ): 981 if (_IOC_SIZE(cmd) <= sizeof(sbuf)) { 982 parg = sbuf; 983 } else { 984 /* too big to allocate from stack */ 985 mbuf = kmalloc(_IOC_SIZE(cmd), GFP_KERNEL); 986 if (!mbuf) 987 return -ENOMEM; 988 parg = mbuf; 989 } 990 991 err = -EFAULT; 992 if (copy_from_user(parg, (void __user *)arg, _IOC_SIZE(cmd))) 993 goto out; 994 break; 995 } 996 997 /* call driver */ 998 err = func(file, cmd, parg); 999 if (err == -ENOIOCTLCMD) 1000 err = -ENOTTY; 1001 1002 if (err < 0) 1003 goto out; 1004 1005 /* Copy results into user buffer */ 1006 switch (_IOC_DIR(cmd)) { 1007 case _IOC_READ: 1008 case (_IOC_WRITE | _IOC_READ): 1009 if (copy_to_user((void __user *)arg, parg, _IOC_SIZE(cmd))) 1010 err = -EFAULT; 1011 break; 1012 } 1013 1014 out: 1015 kfree(mbuf); 1016 return err; 1017 } 1018 1019 #if IS_ENABLED(CONFIG_I2C) 1020 struct i2c_client *dvb_module_probe(const char *module_name, 1021 const char *name, 1022 struct i2c_adapter *adap, 1023 unsigned char addr, 1024 void *platform_data) 1025 { 1026 struct i2c_client *client; 1027 struct i2c_board_info *board_info; 1028 1029 board_info = kzalloc_obj(*board_info, GFP_KERNEL); 1030 if (!board_info) 1031 return NULL; 1032 1033 if (name) 1034 strscpy(board_info->type, name, I2C_NAME_SIZE); 1035 else 1036 strscpy(board_info->type, module_name, I2C_NAME_SIZE); 1037 1038 board_info->addr = addr; 1039 board_info->platform_data = platform_data; 1040 request_module(module_name); 1041 client = i2c_new_client_device(adap, board_info); 1042 if (!i2c_client_has_driver(client)) { 1043 kfree(board_info); 1044 return NULL; 1045 } 1046 1047 if (!try_module_get(client->dev.driver->owner)) { 1048 i2c_unregister_device(client); 1049 client = NULL; 1050 } 1051 1052 kfree(board_info); 1053 return client; 1054 } 1055 EXPORT_SYMBOL_GPL(dvb_module_probe); 1056 1057 void dvb_module_release(struct i2c_client *client) 1058 { 1059 if (!client) 1060 return; 1061 1062 module_put(client->dev.driver->owner); 1063 i2c_unregister_device(client); 1064 } 1065 EXPORT_SYMBOL_GPL(dvb_module_release); 1066 #endif 1067 1068 static int dvb_uevent(const struct device *dev, struct kobj_uevent_env *env) 1069 { 1070 const struct dvb_device *dvbdev = dev_get_drvdata(dev); 1071 1072 add_uevent_var(env, "DVB_ADAPTER_NUM=%d", dvbdev->adapter->num); 1073 add_uevent_var(env, "DVB_DEVICE_TYPE=%s", dnames[dvbdev->type]); 1074 add_uevent_var(env, "DVB_DEVICE_NUM=%d", dvbdev->id); 1075 return 0; 1076 } 1077 1078 static char *dvb_devnode(const struct device *dev, umode_t *mode) 1079 { 1080 const struct dvb_device *dvbdev = dev_get_drvdata(dev); 1081 1082 return kasprintf(GFP_KERNEL, "dvb/adapter%d/%s%d", 1083 dvbdev->adapter->num, dnames[dvbdev->type], dvbdev->id); 1084 } 1085 1086 static int __init init_dvbdev(void) 1087 { 1088 int retval; 1089 dev_t dev = MKDEV(DVB_MAJOR, 0); 1090 1091 retval = register_chrdev_region(dev, MAX_DVB_MINORS, "DVB"); 1092 if (retval != 0) { 1093 pr_err("dvb-core: unable to get major %d\n", DVB_MAJOR); 1094 return retval; 1095 } 1096 1097 cdev_init(&dvb_device_cdev, &dvb_device_fops); 1098 retval = cdev_add(&dvb_device_cdev, dev, MAX_DVB_MINORS); 1099 if (retval != 0) { 1100 pr_err("dvb-core: unable register character device\n"); 1101 goto error; 1102 } 1103 1104 dvb_class = class_create("dvb"); 1105 if (IS_ERR(dvb_class)) { 1106 retval = PTR_ERR(dvb_class); 1107 goto error; 1108 } 1109 dvb_class->dev_uevent = dvb_uevent; 1110 dvb_class->devnode = dvb_devnode; 1111 return 0; 1112 1113 error: 1114 cdev_del(&dvb_device_cdev); 1115 unregister_chrdev_region(dev, MAX_DVB_MINORS); 1116 return retval; 1117 } 1118 1119 static void __exit exit_dvbdev(void) 1120 { 1121 struct dvbdevfops_node *node, *next; 1122 1123 class_destroy(dvb_class); 1124 cdev_del(&dvb_device_cdev); 1125 unregister_chrdev_region(MKDEV(DVB_MAJOR, 0), MAX_DVB_MINORS); 1126 1127 list_for_each_entry_safe(node, next, &dvbdevfops_list, list_head) { 1128 list_del(&node->list_head); 1129 kfree(node->fops); 1130 kfree(node); 1131 } 1132 } 1133 1134 subsys_initcall(init_dvbdev); 1135 module_exit(exit_dvbdev); 1136 1137 MODULE_DESCRIPTION("DVB Core Driver"); 1138 MODULE_AUTHOR("Marcus Metzler, Ralph Metzler, Holger Waechtler"); 1139 MODULE_LICENSE("GPL"); 1140