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