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 mutex_unlock(&dvbdev_register_lock); 494 return -ENOMEM; 495 } 496 497 new_node = kzalloc(sizeof(*new_node), GFP_KERNEL); 498 if (!new_node) { 499 kfree(dvbdevfops); 500 kfree(dvbdev); 501 mutex_unlock(&dvbdev_register_lock); 502 return -ENOMEM; 503 } 504 505 new_node->fops = dvbdevfops; 506 new_node->type = type; 507 new_node->template = template; 508 list_add_tail(&new_node->list_head, &dvbdevfops_list); 509 } 510 511 memcpy(dvbdev, template, sizeof(struct dvb_device)); 512 kref_init(&dvbdev->ref); 513 dvbdev->type = type; 514 dvbdev->id = id; 515 dvbdev->adapter = adap; 516 dvbdev->priv = priv; 517 dvbdev->fops = dvbdevfops; 518 init_waitqueue_head(&dvbdev->wait_queue); 519 dvbdevfops->owner = adap->module; 520 list_add_tail(&dvbdev->list_head, &adap->device_list); 521 down_write(&minor_rwsem); 522 #ifdef CONFIG_DVB_DYNAMIC_MINORS 523 for (minor = 0; minor < MAX_DVB_MINORS; minor++) 524 if (!dvb_minors[minor]) 525 break; 526 if (minor == MAX_DVB_MINORS) { 527 if (new_node) { 528 list_del(&new_node->list_head); 529 kfree(dvbdevfops); 530 kfree(new_node); 531 } 532 list_del(&dvbdev->list_head); 533 kfree(dvbdev); 534 up_write(&minor_rwsem); 535 mutex_unlock(&dvbdev_register_lock); 536 return -EINVAL; 537 } 538 #else 539 minor = nums2minor(adap->num, type, id); 540 #endif 541 dvbdev->minor = minor; 542 dvb_minors[minor] = dvb_device_get(dvbdev); 543 up_write(&minor_rwsem); 544 ret = dvb_register_media_device(dvbdev, type, minor, demux_sink_pads); 545 if (ret) { 546 pr_err("%s: dvb_register_media_device failed to create the mediagraph\n", 547 __func__); 548 if (new_node) { 549 list_del(&new_node->list_head); 550 kfree(dvbdevfops); 551 kfree(new_node); 552 } 553 dvb_media_device_free(dvbdev); 554 list_del(&dvbdev->list_head); 555 kfree(dvbdev); 556 mutex_unlock(&dvbdev_register_lock); 557 return ret; 558 } 559 560 clsdev = device_create(dvb_class, adap->device, 561 MKDEV(DVB_MAJOR, minor), 562 dvbdev, "dvb%d.%s%d", adap->num, dnames[type], id); 563 if (IS_ERR(clsdev)) { 564 pr_err("%s: failed to create device dvb%d.%s%d (%ld)\n", 565 __func__, adap->num, dnames[type], id, PTR_ERR(clsdev)); 566 if (new_node) { 567 list_del(&new_node->list_head); 568 kfree(dvbdevfops); 569 kfree(new_node); 570 } 571 dvb_media_device_free(dvbdev); 572 list_del(&dvbdev->list_head); 573 kfree(dvbdev); 574 mutex_unlock(&dvbdev_register_lock); 575 return PTR_ERR(clsdev); 576 } 577 578 dprintk("DVB: register adapter%d/%s%d @ minor: %i (0x%02x)\n", 579 adap->num, dnames[type], id, minor, minor); 580 581 mutex_unlock(&dvbdev_register_lock); 582 return 0; 583 } 584 EXPORT_SYMBOL(dvb_register_device); 585 586 void dvb_remove_device(struct dvb_device *dvbdev) 587 { 588 if (!dvbdev) 589 return; 590 591 down_write(&minor_rwsem); 592 dvb_minors[dvbdev->minor] = NULL; 593 dvb_device_put(dvbdev); 594 up_write(&minor_rwsem); 595 596 dvb_media_device_free(dvbdev); 597 598 device_destroy(dvb_class, MKDEV(DVB_MAJOR, dvbdev->minor)); 599 600 list_del(&dvbdev->list_head); 601 } 602 EXPORT_SYMBOL(dvb_remove_device); 603 604 static void dvb_free_device(struct kref *ref) 605 { 606 struct dvb_device *dvbdev = container_of(ref, struct dvb_device, ref); 607 608 kfree(dvbdev); 609 } 610 611 struct dvb_device *dvb_device_get(struct dvb_device *dvbdev) 612 { 613 kref_get(&dvbdev->ref); 614 return dvbdev; 615 } 616 EXPORT_SYMBOL(dvb_device_get); 617 618 void dvb_device_put(struct dvb_device *dvbdev) 619 { 620 if (dvbdev) 621 kref_put(&dvbdev->ref, dvb_free_device); 622 } 623 624 void dvb_unregister_device(struct dvb_device *dvbdev) 625 { 626 dvb_remove_device(dvbdev); 627 dvb_device_put(dvbdev); 628 } 629 EXPORT_SYMBOL(dvb_unregister_device); 630 631 #ifdef CONFIG_MEDIA_CONTROLLER_DVB 632 633 static int dvb_create_io_intf_links(struct dvb_adapter *adap, 634 struct media_interface *intf, 635 char *name) 636 { 637 struct media_device *mdev = adap->mdev; 638 struct media_entity *entity; 639 struct media_link *link; 640 641 media_device_for_each_entity(entity, mdev) { 642 if (entity->function == MEDIA_ENT_F_IO_DTV) { 643 if (strncmp(entity->name, name, strlen(name))) 644 continue; 645 link = media_create_intf_link(entity, intf, 646 MEDIA_LNK_FL_ENABLED | 647 MEDIA_LNK_FL_IMMUTABLE); 648 if (!link) 649 return -ENOMEM; 650 } 651 } 652 return 0; 653 } 654 655 int dvb_create_media_graph(struct dvb_adapter *adap, 656 bool create_rf_connector) 657 { 658 struct media_device *mdev = adap->mdev; 659 struct media_entity *entity, *tuner = NULL, *demod = NULL, *conn; 660 struct media_entity *demux = NULL, *ca = NULL; 661 struct media_link *link; 662 struct media_interface *intf; 663 unsigned int demux_pad = 0; 664 unsigned int dvr_pad = 0; 665 unsigned int ntuner = 0, ndemod = 0; 666 int ret, pad_source, pad_sink; 667 static const char *connector_name = "Television"; 668 669 if (!mdev) 670 return 0; 671 672 media_device_for_each_entity(entity, mdev) { 673 switch (entity->function) { 674 case MEDIA_ENT_F_TUNER: 675 tuner = entity; 676 ntuner++; 677 break; 678 case MEDIA_ENT_F_DTV_DEMOD: 679 demod = entity; 680 ndemod++; 681 break; 682 case MEDIA_ENT_F_TS_DEMUX: 683 demux = entity; 684 break; 685 case MEDIA_ENT_F_DTV_CA: 686 ca = entity; 687 break; 688 } 689 } 690 691 /* 692 * Prepare to signalize to media_create_pad_links() that multiple 693 * entities of the same type exists and a 1:n or n:1 links need to be 694 * created. 695 * NOTE: if both tuner and demod have multiple instances, it is up 696 * to the caller driver to create such links. 697 */ 698 if (ntuner > 1) 699 tuner = NULL; 700 if (ndemod > 1) 701 demod = NULL; 702 703 if (create_rf_connector) { 704 conn = kzalloc(sizeof(*conn), GFP_KERNEL); 705 if (!conn) 706 return -ENOMEM; 707 adap->conn = conn; 708 709 adap->conn_pads = kzalloc(sizeof(*adap->conn_pads), GFP_KERNEL); 710 if (!adap->conn_pads) 711 return -ENOMEM; 712 713 conn->flags = MEDIA_ENT_FL_CONNECTOR; 714 conn->function = MEDIA_ENT_F_CONN_RF; 715 conn->name = connector_name; 716 adap->conn_pads->flags = MEDIA_PAD_FL_SOURCE; 717 718 ret = media_entity_pads_init(conn, 1, adap->conn_pads); 719 if (ret) 720 return ret; 721 722 ret = media_device_register_entity(mdev, conn); 723 if (ret) 724 return ret; 725 726 if (!ntuner) { 727 ret = media_create_pad_links(mdev, 728 MEDIA_ENT_F_CONN_RF, 729 conn, 0, 730 MEDIA_ENT_F_DTV_DEMOD, 731 demod, 0, 732 MEDIA_LNK_FL_ENABLED, 733 false); 734 } else { 735 pad_sink = media_get_pad_index(tuner, MEDIA_PAD_FL_SINK, 736 PAD_SIGNAL_ANALOG); 737 if (pad_sink < 0) 738 return -EINVAL; 739 ret = media_create_pad_links(mdev, 740 MEDIA_ENT_F_CONN_RF, 741 conn, 0, 742 MEDIA_ENT_F_TUNER, 743 tuner, pad_sink, 744 MEDIA_LNK_FL_ENABLED, 745 false); 746 } 747 if (ret) 748 return ret; 749 } 750 751 if (ntuner && ndemod) { 752 /* NOTE: first found tuner source pad presumed correct */ 753 pad_source = media_get_pad_index(tuner, MEDIA_PAD_FL_SOURCE, 754 PAD_SIGNAL_ANALOG); 755 if (pad_source < 0) 756 return -EINVAL; 757 ret = media_create_pad_links(mdev, 758 MEDIA_ENT_F_TUNER, 759 tuner, pad_source, 760 MEDIA_ENT_F_DTV_DEMOD, 761 demod, 0, MEDIA_LNK_FL_ENABLED, 762 false); 763 if (ret) 764 return ret; 765 } 766 767 if (ndemod && demux) { 768 ret = media_create_pad_links(mdev, 769 MEDIA_ENT_F_DTV_DEMOD, 770 demod, 1, 771 MEDIA_ENT_F_TS_DEMUX, 772 demux, 0, MEDIA_LNK_FL_ENABLED, 773 false); 774 if (ret) 775 return ret; 776 } 777 if (demux && ca) { 778 ret = media_create_pad_link(demux, 1, ca, 779 0, MEDIA_LNK_FL_ENABLED); 780 if (ret) 781 return ret; 782 } 783 784 /* Create demux links for each ringbuffer/pad */ 785 if (demux) { 786 media_device_for_each_entity(entity, mdev) { 787 if (entity->function == MEDIA_ENT_F_IO_DTV) { 788 if (!strncmp(entity->name, DVR_TSOUT, 789 strlen(DVR_TSOUT))) { 790 ret = media_create_pad_link(demux, 791 ++dvr_pad, 792 entity, 0, 0); 793 if (ret) 794 return ret; 795 } 796 if (!strncmp(entity->name, DEMUX_TSOUT, 797 strlen(DEMUX_TSOUT))) { 798 ret = media_create_pad_link(demux, 799 ++demux_pad, 800 entity, 0, 0); 801 if (ret) 802 return ret; 803 } 804 } 805 } 806 } 807 808 /* Create interface links for FE->tuner, DVR->demux and CA->ca */ 809 media_device_for_each_intf(intf, mdev) { 810 if (intf->type == MEDIA_INTF_T_DVB_CA && ca) { 811 link = media_create_intf_link(ca, intf, 812 MEDIA_LNK_FL_ENABLED | 813 MEDIA_LNK_FL_IMMUTABLE); 814 if (!link) 815 return -ENOMEM; 816 } 817 818 if (intf->type == MEDIA_INTF_T_DVB_FE && tuner) { 819 link = media_create_intf_link(tuner, intf, 820 MEDIA_LNK_FL_ENABLED | 821 MEDIA_LNK_FL_IMMUTABLE); 822 if (!link) 823 return -ENOMEM; 824 } 825 #if 0 826 /* 827 * Indirect link - let's not create yet, as we don't know how 828 * to handle indirect links, nor if this will 829 * actually be needed. 830 */ 831 if (intf->type == MEDIA_INTF_T_DVB_DVR && demux) { 832 link = media_create_intf_link(demux, intf, 833 MEDIA_LNK_FL_ENABLED | 834 MEDIA_LNK_FL_IMMUTABLE); 835 if (!link) 836 return -ENOMEM; 837 } 838 #endif 839 if (intf->type == MEDIA_INTF_T_DVB_DVR) { 840 ret = dvb_create_io_intf_links(adap, intf, DVR_TSOUT); 841 if (ret) 842 return ret; 843 } 844 if (intf->type == MEDIA_INTF_T_DVB_DEMUX) { 845 ret = dvb_create_io_intf_links(adap, intf, DEMUX_TSOUT); 846 if (ret) 847 return ret; 848 } 849 } 850 return 0; 851 } 852 EXPORT_SYMBOL_GPL(dvb_create_media_graph); 853 #endif 854 855 static int dvbdev_check_free_adapter_num(int num) 856 { 857 struct list_head *entry; 858 859 list_for_each(entry, &dvb_adapter_list) { 860 struct dvb_adapter *adap; 861 862 adap = list_entry(entry, struct dvb_adapter, list_head); 863 if (adap->num == num) 864 return 0; 865 } 866 return 1; 867 } 868 869 static int dvbdev_get_free_adapter_num(void) 870 { 871 int num = 0; 872 873 while (num < DVB_MAX_ADAPTERS) { 874 if (dvbdev_check_free_adapter_num(num)) 875 return num; 876 num++; 877 } 878 879 return -ENFILE; 880 } 881 882 int dvb_register_adapter(struct dvb_adapter *adap, const char *name, 883 struct module *module, struct device *device, 884 short *adapter_nums) 885 { 886 int i, num; 887 888 mutex_lock(&dvbdev_register_lock); 889 890 for (i = 0; i < DVB_MAX_ADAPTERS; ++i) { 891 num = adapter_nums[i]; 892 if (num >= 0 && num < DVB_MAX_ADAPTERS) { 893 /* use the one the driver asked for */ 894 if (dvbdev_check_free_adapter_num(num)) 895 break; 896 } else { 897 num = dvbdev_get_free_adapter_num(); 898 break; 899 } 900 num = -1; 901 } 902 903 if (num < 0) { 904 mutex_unlock(&dvbdev_register_lock); 905 return -ENFILE; 906 } 907 908 memset(adap, 0, sizeof(struct dvb_adapter)); 909 INIT_LIST_HEAD(&adap->device_list); 910 911 pr_info("DVB: registering new adapter (%s)\n", name); 912 913 adap->num = num; 914 adap->name = name; 915 adap->module = module; 916 adap->device = device; 917 adap->mfe_shared = 0; 918 adap->mfe_dvbdev = NULL; 919 mutex_init(&adap->mfe_lock); 920 921 #ifdef CONFIG_MEDIA_CONTROLLER_DVB 922 mutex_init(&adap->mdev_lock); 923 #endif 924 925 list_add_tail(&adap->list_head, &dvb_adapter_list); 926 927 mutex_unlock(&dvbdev_register_lock); 928 929 return num; 930 } 931 EXPORT_SYMBOL(dvb_register_adapter); 932 933 int dvb_unregister_adapter(struct dvb_adapter *adap) 934 { 935 mutex_lock(&dvbdev_register_lock); 936 list_del(&adap->list_head); 937 mutex_unlock(&dvbdev_register_lock); 938 return 0; 939 } 940 EXPORT_SYMBOL(dvb_unregister_adapter); 941 942 /* 943 * if the miracle happens and "generic_usercopy()" is included into 944 * the kernel, then this can vanish. please don't make the mistake and 945 * define this as video_usercopy(). this will introduce a dependency 946 * to the v4l "videodev.o" module, which is unnecessary for some 947 * cards (ie. the budget dvb-cards don't need the v4l module...) 948 */ 949 int dvb_usercopy(struct file *file, 950 unsigned int cmd, unsigned long arg, 951 int (*func)(struct file *file, 952 unsigned int cmd, void *arg)) 953 { 954 char sbuf[128]; 955 void *mbuf = NULL; 956 void *parg = NULL; 957 int err = -EINVAL; 958 959 /* Copy arguments into temp kernel buffer */ 960 switch (_IOC_DIR(cmd)) { 961 case _IOC_NONE: 962 /* 963 * For this command, the pointer is actually an integer 964 * argument. 965 */ 966 parg = (void *)arg; 967 break; 968 case _IOC_READ: /* some v4l ioctls are marked wrong ... */ 969 case _IOC_WRITE: 970 case (_IOC_WRITE | _IOC_READ): 971 if (_IOC_SIZE(cmd) <= sizeof(sbuf)) { 972 parg = sbuf; 973 } else { 974 /* too big to allocate from stack */ 975 mbuf = kmalloc(_IOC_SIZE(cmd), GFP_KERNEL); 976 if (!mbuf) 977 return -ENOMEM; 978 parg = mbuf; 979 } 980 981 err = -EFAULT; 982 if (copy_from_user(parg, (void __user *)arg, _IOC_SIZE(cmd))) 983 goto out; 984 break; 985 } 986 987 /* call driver */ 988 err = func(file, cmd, parg); 989 if (err == -ENOIOCTLCMD) 990 err = -ENOTTY; 991 992 if (err < 0) 993 goto out; 994 995 /* Copy results into user buffer */ 996 switch (_IOC_DIR(cmd)) { 997 case _IOC_READ: 998 case (_IOC_WRITE | _IOC_READ): 999 if (copy_to_user((void __user *)arg, parg, _IOC_SIZE(cmd))) 1000 err = -EFAULT; 1001 break; 1002 } 1003 1004 out: 1005 kfree(mbuf); 1006 return err; 1007 } 1008 1009 #if IS_ENABLED(CONFIG_I2C) 1010 struct i2c_client *dvb_module_probe(const char *module_name, 1011 const char *name, 1012 struct i2c_adapter *adap, 1013 unsigned char addr, 1014 void *platform_data) 1015 { 1016 struct i2c_client *client; 1017 struct i2c_board_info *board_info; 1018 1019 board_info = kzalloc(sizeof(*board_info), GFP_KERNEL); 1020 if (!board_info) 1021 return NULL; 1022 1023 if (name) 1024 strscpy(board_info->type, name, I2C_NAME_SIZE); 1025 else 1026 strscpy(board_info->type, module_name, I2C_NAME_SIZE); 1027 1028 board_info->addr = addr; 1029 board_info->platform_data = platform_data; 1030 request_module(module_name); 1031 client = i2c_new_client_device(adap, board_info); 1032 if (!i2c_client_has_driver(client)) { 1033 kfree(board_info); 1034 return NULL; 1035 } 1036 1037 if (!try_module_get(client->dev.driver->owner)) { 1038 i2c_unregister_device(client); 1039 client = NULL; 1040 } 1041 1042 kfree(board_info); 1043 return client; 1044 } 1045 EXPORT_SYMBOL_GPL(dvb_module_probe); 1046 1047 void dvb_module_release(struct i2c_client *client) 1048 { 1049 if (!client) 1050 return; 1051 1052 module_put(client->dev.driver->owner); 1053 i2c_unregister_device(client); 1054 } 1055 EXPORT_SYMBOL_GPL(dvb_module_release); 1056 #endif 1057 1058 static int dvb_uevent(const struct device *dev, struct kobj_uevent_env *env) 1059 { 1060 const struct dvb_device *dvbdev = dev_get_drvdata(dev); 1061 1062 add_uevent_var(env, "DVB_ADAPTER_NUM=%d", dvbdev->adapter->num); 1063 add_uevent_var(env, "DVB_DEVICE_TYPE=%s", dnames[dvbdev->type]); 1064 add_uevent_var(env, "DVB_DEVICE_NUM=%d", dvbdev->id); 1065 return 0; 1066 } 1067 1068 static char *dvb_devnode(const struct device *dev, umode_t *mode) 1069 { 1070 const struct dvb_device *dvbdev = dev_get_drvdata(dev); 1071 1072 return kasprintf(GFP_KERNEL, "dvb/adapter%d/%s%d", 1073 dvbdev->adapter->num, dnames[dvbdev->type], dvbdev->id); 1074 } 1075 1076 static int __init init_dvbdev(void) 1077 { 1078 int retval; 1079 dev_t dev = MKDEV(DVB_MAJOR, 0); 1080 1081 retval = register_chrdev_region(dev, MAX_DVB_MINORS, "DVB"); 1082 if (retval != 0) { 1083 pr_err("dvb-core: unable to get major %d\n", DVB_MAJOR); 1084 return retval; 1085 } 1086 1087 cdev_init(&dvb_device_cdev, &dvb_device_fops); 1088 retval = cdev_add(&dvb_device_cdev, dev, MAX_DVB_MINORS); 1089 if (retval != 0) { 1090 pr_err("dvb-core: unable register character device\n"); 1091 goto error; 1092 } 1093 1094 dvb_class = class_create("dvb"); 1095 if (IS_ERR(dvb_class)) { 1096 retval = PTR_ERR(dvb_class); 1097 goto error; 1098 } 1099 dvb_class->dev_uevent = dvb_uevent; 1100 dvb_class->devnode = dvb_devnode; 1101 return 0; 1102 1103 error: 1104 cdev_del(&dvb_device_cdev); 1105 unregister_chrdev_region(dev, MAX_DVB_MINORS); 1106 return retval; 1107 } 1108 1109 static void __exit exit_dvbdev(void) 1110 { 1111 struct dvbdevfops_node *node, *next; 1112 1113 class_destroy(dvb_class); 1114 cdev_del(&dvb_device_cdev); 1115 unregister_chrdev_region(MKDEV(DVB_MAJOR, 0), MAX_DVB_MINORS); 1116 1117 list_for_each_entry_safe(node, next, &dvbdevfops_list, list_head) { 1118 list_del(&node->list_head); 1119 kfree(node->fops); 1120 kfree(node); 1121 } 1122 } 1123 1124 subsys_initcall(init_dvbdev); 1125 module_exit(exit_dvbdev); 1126 1127 MODULE_DESCRIPTION("DVB Core Driver"); 1128 MODULE_AUTHOR("Marcus Metzler, Ralph Metzler, Holger Waechtler"); 1129 MODULE_LICENSE("GPL"); 1130