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