1 /* 2 * dvbdev.c 3 * 4 * Copyright (C) 2000 Ralph Metzler <ralph@convergence.de> 5 * & Marcus Metzler <marcus@convergence.de> 6 * for convergence integrated media GmbH 7 * 8 * This program is free software; you can redistribute it and/or 9 * modify it under the terms of the GNU Lesser General Public License 10 * as published by the Free Software Foundation; either version 2.1 11 * of the License, or (at your option) any later version. 12 * 13 * This program is distributed in the hope that it will be useful, 14 * but WITHOUT ANY WARRANTY; without even the implied warranty of 15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 16 * GNU General Public License for more details. 17 * 18 */ 19 20 #define pr_fmt(fmt) "dvbdev: " fmt 21 22 #include <linux/types.h> 23 #include <linux/errno.h> 24 #include <linux/string.h> 25 #include <linux/module.h> 26 #include <linux/kernel.h> 27 #include <linux/i2c.h> 28 #include <linux/init.h> 29 #include <linux/slab.h> 30 #include <linux/device.h> 31 #include <linux/fs.h> 32 #include <linux/cdev.h> 33 #include <linux/mutex.h> 34 #include <media/dvbdev.h> 35 36 /* Due to enum tuner_pad_index */ 37 #include <media/tuner.h> 38 39 static DEFINE_MUTEX(dvbdev_mutex); 40 static int dvbdev_debug; 41 42 module_param(dvbdev_debug, int, 0644); 43 MODULE_PARM_DESC(dvbdev_debug, "Turn on/off device debugging (default:off)."); 44 45 #define dprintk(fmt, arg...) do { \ 46 if (dvbdev_debug) \ 47 printk(KERN_DEBUG pr_fmt("%s: " fmt), \ 48 __func__, ##arg); \ 49 } while (0) 50 51 static LIST_HEAD(dvb_adapter_list); 52 static DEFINE_MUTEX(dvbdev_register_lock); 53 54 static const char * const dnames[] = { 55 [DVB_DEVICE_VIDEO] = "video", 56 [DVB_DEVICE_AUDIO] = "audio", 57 [DVB_DEVICE_SEC] = "sec", 58 [DVB_DEVICE_FRONTEND] = "frontend", 59 [DVB_DEVICE_DEMUX] = "demux", 60 [DVB_DEVICE_DVR] = "dvr", 61 [DVB_DEVICE_CA] = "ca", 62 [DVB_DEVICE_NET] = "net", 63 [DVB_DEVICE_OSD] = "osd" 64 }; 65 66 #ifdef CONFIG_DVB_DYNAMIC_MINORS 67 #define MAX_DVB_MINORS 256 68 #define DVB_MAX_IDS MAX_DVB_MINORS 69 #else 70 #define DVB_MAX_IDS 4 71 72 static const u8 minor_type[] = { 73 [DVB_DEVICE_VIDEO] = 0, 74 [DVB_DEVICE_AUDIO] = 1, 75 [DVB_DEVICE_SEC] = 2, 76 [DVB_DEVICE_FRONTEND] = 3, 77 [DVB_DEVICE_DEMUX] = 4, 78 [DVB_DEVICE_DVR] = 5, 79 [DVB_DEVICE_CA] = 6, 80 [DVB_DEVICE_NET] = 7, 81 [DVB_DEVICE_OSD] = 8, 82 }; 83 84 #define nums2minor(num, type, id) \ 85 (((num) << 6) | ((id) << 4) | minor_type[type]) 86 87 #define MAX_DVB_MINORS (DVB_MAX_ADAPTERS*64) 88 #endif 89 90 static struct class *dvb_class; 91 92 static struct dvb_device *dvb_minors[MAX_DVB_MINORS]; 93 static DECLARE_RWSEM(minor_rwsem); 94 95 static int dvb_device_open(struct inode *inode, struct file *file) 96 { 97 struct dvb_device *dvbdev; 98 99 mutex_lock(&dvbdev_mutex); 100 down_read(&minor_rwsem); 101 dvbdev = dvb_minors[iminor(inode)]; 102 103 if (dvbdev && dvbdev->fops) { 104 int err = 0; 105 const struct file_operations *new_fops; 106 107 new_fops = fops_get(dvbdev->fops); 108 if (!new_fops) 109 goto fail; 110 file->private_data = dvbdev; 111 replace_fops(file, new_fops); 112 if (file->f_op->open) 113 err = file->f_op->open(inode, file); 114 up_read(&minor_rwsem); 115 mutex_unlock(&dvbdev_mutex); 116 return err; 117 } 118 fail: 119 up_read(&minor_rwsem); 120 mutex_unlock(&dvbdev_mutex); 121 return -ENODEV; 122 } 123 124 125 static const struct file_operations dvb_device_fops = 126 { 127 .owner = THIS_MODULE, 128 .open = dvb_device_open, 129 .llseek = noop_llseek, 130 }; 131 132 static struct cdev dvb_device_cdev; 133 134 int dvb_generic_open(struct inode *inode, struct file *file) 135 { 136 struct dvb_device *dvbdev = file->private_data; 137 138 if (!dvbdev) 139 return -ENODEV; 140 141 if (!dvbdev->users) 142 return -EBUSY; 143 144 if ((file->f_flags & O_ACCMODE) == O_RDONLY) { 145 if (!dvbdev->readers) 146 return -EBUSY; 147 dvbdev->readers--; 148 } else { 149 if (!dvbdev->writers) 150 return -EBUSY; 151 dvbdev->writers--; 152 } 153 154 dvbdev->users--; 155 return 0; 156 } 157 EXPORT_SYMBOL(dvb_generic_open); 158 159 160 int dvb_generic_release(struct inode *inode, struct file *file) 161 { 162 struct dvb_device *dvbdev = file->private_data; 163 164 if (!dvbdev) 165 return -ENODEV; 166 167 if ((file->f_flags & O_ACCMODE) == O_RDONLY) { 168 dvbdev->readers++; 169 } else { 170 dvbdev->writers++; 171 } 172 173 dvbdev->users++; 174 return 0; 175 } 176 EXPORT_SYMBOL(dvb_generic_release); 177 178 179 long dvb_generic_ioctl(struct file *file, 180 unsigned int cmd, unsigned long arg) 181 { 182 struct dvb_device *dvbdev = file->private_data; 183 184 if (!dvbdev) 185 return -ENODEV; 186 187 if (!dvbdev->kernel_ioctl) 188 return -EINVAL; 189 190 return dvb_usercopy(file, cmd, arg, dvbdev->kernel_ioctl); 191 } 192 EXPORT_SYMBOL(dvb_generic_ioctl); 193 194 195 static int dvbdev_get_free_id (struct dvb_adapter *adap, int type) 196 { 197 u32 id = 0; 198 199 while (id < DVB_MAX_IDS) { 200 struct dvb_device *dev; 201 list_for_each_entry(dev, &adap->device_list, list_head) 202 if (dev->type == type && dev->id == id) 203 goto skip; 204 return id; 205 skip: 206 id++; 207 } 208 return -ENFILE; 209 } 210 211 static void dvb_media_device_free(struct dvb_device *dvbdev) 212 { 213 #if defined(CONFIG_MEDIA_CONTROLLER_DVB) 214 if (dvbdev->entity) { 215 media_device_unregister_entity(dvbdev->entity); 216 kfree(dvbdev->entity); 217 kfree(dvbdev->pads); 218 dvbdev->entity = NULL; 219 dvbdev->pads = NULL; 220 } 221 222 if (dvbdev->tsout_entity) { 223 int i; 224 225 for (i = 0; i < dvbdev->tsout_num_entities; i++) { 226 media_device_unregister_entity(&dvbdev->tsout_entity[i]); 227 kfree(dvbdev->tsout_entity[i].name); 228 } 229 kfree(dvbdev->tsout_entity); 230 kfree(dvbdev->tsout_pads); 231 dvbdev->tsout_entity = NULL; 232 dvbdev->tsout_pads = NULL; 233 234 dvbdev->tsout_num_entities = 0; 235 } 236 237 if (dvbdev->intf_devnode) { 238 media_devnode_remove(dvbdev->intf_devnode); 239 dvbdev->intf_devnode = NULL; 240 } 241 242 if (dvbdev->adapter->conn) { 243 media_device_unregister_entity(dvbdev->adapter->conn); 244 kfree(dvbdev->adapter->conn); 245 dvbdev->adapter->conn = NULL; 246 kfree(dvbdev->adapter->conn_pads); 247 dvbdev->adapter->conn_pads = NULL; 248 } 249 #endif 250 } 251 252 #if defined(CONFIG_MEDIA_CONTROLLER_DVB) 253 static int dvb_create_tsout_entity(struct dvb_device *dvbdev, 254 const char *name, int npads) 255 { 256 int i, ret = 0; 257 258 dvbdev->tsout_pads = kcalloc(npads, sizeof(*dvbdev->tsout_pads), 259 GFP_KERNEL); 260 if (!dvbdev->tsout_pads) 261 return -ENOMEM; 262 263 dvbdev->tsout_entity = kcalloc(npads, sizeof(*dvbdev->tsout_entity), 264 GFP_KERNEL); 265 if (!dvbdev->tsout_entity) 266 return -ENOMEM; 267 268 dvbdev->tsout_num_entities = npads; 269 270 for (i = 0; i < npads; i++) { 271 struct media_pad *pads = &dvbdev->tsout_pads[i]; 272 struct media_entity *entity = &dvbdev->tsout_entity[i]; 273 274 entity->name = kasprintf(GFP_KERNEL, "%s #%d", name, i); 275 if (!entity->name) 276 return -ENOMEM; 277 278 entity->function = MEDIA_ENT_F_IO_DTV; 279 pads->flags = MEDIA_PAD_FL_SINK; 280 281 ret = media_entity_pads_init(entity, 1, pads); 282 if (ret < 0) 283 return ret; 284 285 ret = media_device_register_entity(dvbdev->adapter->mdev, 286 entity); 287 if (ret < 0) 288 return ret; 289 } 290 return 0; 291 } 292 293 #define DEMUX_TSOUT "demux-tsout" 294 #define DVR_TSOUT "dvr-tsout" 295 296 static int dvb_create_media_entity(struct dvb_device *dvbdev, 297 int type, int demux_sink_pads) 298 { 299 int i, ret, npads; 300 301 switch (type) { 302 case DVB_DEVICE_FRONTEND: 303 npads = 2; 304 break; 305 case DVB_DEVICE_DVR: 306 ret = dvb_create_tsout_entity(dvbdev, DVR_TSOUT, 307 demux_sink_pads); 308 return ret; 309 case DVB_DEVICE_DEMUX: 310 npads = 1 + demux_sink_pads; 311 ret = dvb_create_tsout_entity(dvbdev, DEMUX_TSOUT, 312 demux_sink_pads); 313 if (ret < 0) 314 return ret; 315 break; 316 case DVB_DEVICE_CA: 317 npads = 2; 318 break; 319 case DVB_DEVICE_NET: 320 /* 321 * We should be creating entities for the MPE/ULE 322 * decapsulation hardware (or software implementation). 323 * 324 * However, the number of for the MPE/ULE decaps may not be 325 * fixed. As we don't have yet dynamic support for PADs at 326 * the Media Controller, let's not create the decap 327 * entities yet. 328 */ 329 return 0; 330 default: 331 return 0; 332 } 333 334 dvbdev->entity = kzalloc(sizeof(*dvbdev->entity), GFP_KERNEL); 335 if (!dvbdev->entity) 336 return -ENOMEM; 337 338 dvbdev->entity->name = dvbdev->name; 339 340 if (npads) { 341 dvbdev->pads = kcalloc(npads, sizeof(*dvbdev->pads), 342 GFP_KERNEL); 343 if (!dvbdev->pads) { 344 kfree(dvbdev->entity); 345 return -ENOMEM; 346 } 347 } 348 349 switch (type) { 350 case DVB_DEVICE_FRONTEND: 351 dvbdev->entity->function = MEDIA_ENT_F_DTV_DEMOD; 352 dvbdev->pads[0].flags = MEDIA_PAD_FL_SINK; 353 dvbdev->pads[1].flags = MEDIA_PAD_FL_SOURCE; 354 break; 355 case DVB_DEVICE_DEMUX: 356 dvbdev->entity->function = MEDIA_ENT_F_TS_DEMUX; 357 dvbdev->pads[0].flags = MEDIA_PAD_FL_SINK; 358 for (i = 1; i < npads; i++) 359 dvbdev->pads[i].flags = MEDIA_PAD_FL_SOURCE; 360 break; 361 case DVB_DEVICE_CA: 362 dvbdev->entity->function = MEDIA_ENT_F_DTV_CA; 363 dvbdev->pads[0].flags = MEDIA_PAD_FL_SINK; 364 dvbdev->pads[1].flags = MEDIA_PAD_FL_SOURCE; 365 break; 366 default: 367 /* Should never happen, as the first switch prevents it */ 368 kfree(dvbdev->entity); 369 kfree(dvbdev->pads); 370 dvbdev->entity = NULL; 371 dvbdev->pads = NULL; 372 return 0; 373 } 374 375 if (npads) { 376 ret = media_entity_pads_init(dvbdev->entity, npads, dvbdev->pads); 377 if (ret) 378 return ret; 379 } 380 ret = media_device_register_entity(dvbdev->adapter->mdev, 381 dvbdev->entity); 382 if (ret) 383 return ret; 384 385 pr_info("%s: media entity '%s' registered.\n", 386 __func__, dvbdev->entity->name); 387 388 return 0; 389 } 390 #endif 391 392 static int dvb_register_media_device(struct dvb_device *dvbdev, 393 int type, int minor, 394 unsigned demux_sink_pads) 395 { 396 #if defined(CONFIG_MEDIA_CONTROLLER_DVB) 397 struct media_link *link; 398 u32 intf_type; 399 int ret; 400 401 if (!dvbdev->adapter->mdev) 402 return 0; 403 404 ret = dvb_create_media_entity(dvbdev, type, demux_sink_pads); 405 if (ret) 406 return ret; 407 408 switch (type) { 409 case DVB_DEVICE_FRONTEND: 410 intf_type = MEDIA_INTF_T_DVB_FE; 411 break; 412 case DVB_DEVICE_DEMUX: 413 intf_type = MEDIA_INTF_T_DVB_DEMUX; 414 break; 415 case DVB_DEVICE_DVR: 416 intf_type = MEDIA_INTF_T_DVB_DVR; 417 break; 418 case DVB_DEVICE_CA: 419 intf_type = MEDIA_INTF_T_DVB_CA; 420 break; 421 case DVB_DEVICE_NET: 422 intf_type = MEDIA_INTF_T_DVB_NET; 423 break; 424 default: 425 return 0; 426 } 427 428 dvbdev->intf_devnode = media_devnode_create(dvbdev->adapter->mdev, 429 intf_type, 0, 430 DVB_MAJOR, minor); 431 432 if (!dvbdev->intf_devnode) 433 return -ENOMEM; 434 435 /* 436 * Create the "obvious" link, e. g. the ones that represent 437 * a direct association between an interface and an entity. 438 * Other links should be created elsewhere, like: 439 * DVB FE intf -> tuner 440 * DVB demux intf -> dvr 441 */ 442 443 if (!dvbdev->entity) 444 return 0; 445 446 link = media_create_intf_link(dvbdev->entity, 447 &dvbdev->intf_devnode->intf, 448 MEDIA_LNK_FL_ENABLED | 449 MEDIA_LNK_FL_IMMUTABLE); 450 if (!link) 451 return -ENOMEM; 452 #endif 453 return 0; 454 } 455 456 int dvb_register_device(struct dvb_adapter *adap, struct dvb_device **pdvbdev, 457 const struct dvb_device *template, void *priv, 458 enum dvb_device_type type, int demux_sink_pads) 459 { 460 struct dvb_device *dvbdev; 461 struct file_operations *dvbdevfops; 462 struct device *clsdev; 463 int minor; 464 int id, ret; 465 466 mutex_lock(&dvbdev_register_lock); 467 468 if ((id = dvbdev_get_free_id (adap, type)) < 0){ 469 mutex_unlock(&dvbdev_register_lock); 470 *pdvbdev = NULL; 471 pr_err("%s: couldn't find free device id\n", __func__); 472 return -ENFILE; 473 } 474 475 *pdvbdev = dvbdev = kzalloc(sizeof(*dvbdev), GFP_KERNEL); 476 477 if (!dvbdev){ 478 mutex_unlock(&dvbdev_register_lock); 479 return -ENOMEM; 480 } 481 482 dvbdevfops = kmemdup(template->fops, sizeof(*dvbdevfops), GFP_KERNEL); 483 484 if (!dvbdevfops){ 485 kfree (dvbdev); 486 mutex_unlock(&dvbdev_register_lock); 487 return -ENOMEM; 488 } 489 490 memcpy(dvbdev, template, sizeof(struct dvb_device)); 491 dvbdev->type = type; 492 dvbdev->id = id; 493 dvbdev->adapter = adap; 494 dvbdev->priv = priv; 495 dvbdev->fops = dvbdevfops; 496 init_waitqueue_head (&dvbdev->wait_queue); 497 498 dvbdevfops->owner = adap->module; 499 500 list_add_tail (&dvbdev->list_head, &adap->device_list); 501 502 down_write(&minor_rwsem); 503 #ifdef CONFIG_DVB_DYNAMIC_MINORS 504 for (minor = 0; minor < MAX_DVB_MINORS; minor++) 505 if (dvb_minors[minor] == NULL) 506 break; 507 508 if (minor == MAX_DVB_MINORS) { 509 kfree(dvbdevfops); 510 kfree(dvbdev); 511 up_write(&minor_rwsem); 512 mutex_unlock(&dvbdev_register_lock); 513 return -EINVAL; 514 } 515 #else 516 minor = nums2minor(adap->num, type, id); 517 #endif 518 519 dvbdev->minor = minor; 520 dvb_minors[minor] = dvbdev; 521 up_write(&minor_rwsem); 522 523 ret = dvb_register_media_device(dvbdev, type, minor, demux_sink_pads); 524 if (ret) { 525 pr_err("%s: dvb_register_media_device failed to create the mediagraph\n", 526 __func__); 527 528 dvb_media_device_free(dvbdev); 529 kfree(dvbdevfops); 530 kfree(dvbdev); 531 mutex_unlock(&dvbdev_register_lock); 532 return ret; 533 } 534 535 mutex_unlock(&dvbdev_register_lock); 536 537 clsdev = device_create(dvb_class, adap->device, 538 MKDEV(DVB_MAJOR, minor), 539 dvbdev, "dvb%d.%s%d", adap->num, dnames[type], id); 540 if (IS_ERR(clsdev)) { 541 pr_err("%s: failed to create device dvb%d.%s%d (%ld)\n", 542 __func__, adap->num, dnames[type], id, PTR_ERR(clsdev)); 543 dvb_media_device_free(dvbdev); 544 kfree(dvbdevfops); 545 kfree(dvbdev); 546 return PTR_ERR(clsdev); 547 } 548 dprintk("DVB: register adapter%d/%s%d @ minor: %i (0x%02x)\n", 549 adap->num, dnames[type], id, minor, minor); 550 551 return 0; 552 } 553 EXPORT_SYMBOL(dvb_register_device); 554 555 556 void dvb_remove_device(struct dvb_device *dvbdev) 557 { 558 if (!dvbdev) 559 return; 560 561 down_write(&minor_rwsem); 562 dvb_minors[dvbdev->minor] = NULL; 563 up_write(&minor_rwsem); 564 565 dvb_media_device_free(dvbdev); 566 567 device_destroy(dvb_class, MKDEV(DVB_MAJOR, dvbdev->minor)); 568 569 list_del (&dvbdev->list_head); 570 } 571 EXPORT_SYMBOL(dvb_remove_device); 572 573 574 void dvb_free_device(struct dvb_device *dvbdev) 575 { 576 if (!dvbdev) 577 return; 578 579 kfree (dvbdev->fops); 580 kfree (dvbdev); 581 } 582 EXPORT_SYMBOL(dvb_free_device); 583 584 585 void dvb_unregister_device(struct dvb_device *dvbdev) 586 { 587 dvb_remove_device(dvbdev); 588 dvb_free_device(dvbdev); 589 } 590 EXPORT_SYMBOL(dvb_unregister_device); 591 592 593 #ifdef CONFIG_MEDIA_CONTROLLER_DVB 594 595 static int dvb_create_io_intf_links(struct dvb_adapter *adap, 596 struct media_interface *intf, 597 char *name) 598 { 599 struct media_device *mdev = adap->mdev; 600 struct media_entity *entity; 601 struct media_link *link; 602 603 media_device_for_each_entity(entity, mdev) { 604 if (entity->function == MEDIA_ENT_F_IO_DTV) { 605 if (strncmp(entity->name, name, strlen(name))) 606 continue; 607 link = media_create_intf_link(entity, intf, 608 MEDIA_LNK_FL_ENABLED | 609 MEDIA_LNK_FL_IMMUTABLE); 610 if (!link) 611 return -ENOMEM; 612 } 613 } 614 return 0; 615 } 616 617 int dvb_create_media_graph(struct dvb_adapter *adap, 618 bool create_rf_connector) 619 { 620 struct media_device *mdev = adap->mdev; 621 struct media_entity *entity, *tuner = NULL, *demod = NULL, *conn; 622 struct media_entity *demux = NULL, *ca = NULL; 623 struct media_link *link; 624 struct media_interface *intf; 625 unsigned demux_pad = 0; 626 unsigned dvr_pad = 0; 627 unsigned ntuner = 0, ndemod = 0; 628 int ret, pad_source, pad_sink; 629 static const char *connector_name = "Television"; 630 631 if (!mdev) 632 return 0; 633 634 media_device_for_each_entity(entity, mdev) { 635 switch (entity->function) { 636 case MEDIA_ENT_F_TUNER: 637 tuner = entity; 638 ntuner++; 639 break; 640 case MEDIA_ENT_F_DTV_DEMOD: 641 demod = entity; 642 ndemod++; 643 break; 644 case MEDIA_ENT_F_TS_DEMUX: 645 demux = entity; 646 break; 647 case MEDIA_ENT_F_DTV_CA: 648 ca = entity; 649 break; 650 } 651 } 652 653 /* 654 * Prepare to signalize to media_create_pad_links() that multiple 655 * entities of the same type exists and a 1:n or n:1 links need to be 656 * created. 657 * NOTE: if both tuner and demod have multiple instances, it is up 658 * to the caller driver to create such links. 659 */ 660 if (ntuner > 1) 661 tuner = NULL; 662 if (ndemod > 1) 663 demod = NULL; 664 665 if (create_rf_connector) { 666 conn = kzalloc(sizeof(*conn), GFP_KERNEL); 667 if (!conn) 668 return -ENOMEM; 669 adap->conn = conn; 670 671 adap->conn_pads = kzalloc(sizeof(*adap->conn_pads), GFP_KERNEL); 672 if (!adap->conn_pads) 673 return -ENOMEM; 674 675 conn->flags = MEDIA_ENT_FL_CONNECTOR; 676 conn->function = MEDIA_ENT_F_CONN_RF; 677 conn->name = connector_name; 678 adap->conn_pads->flags = MEDIA_PAD_FL_SOURCE; 679 680 ret = media_entity_pads_init(conn, 1, adap->conn_pads); 681 if (ret) 682 return ret; 683 684 ret = media_device_register_entity(mdev, conn); 685 if (ret) 686 return ret; 687 688 if (!ntuner) { 689 ret = media_create_pad_links(mdev, 690 MEDIA_ENT_F_CONN_RF, 691 conn, 0, 692 MEDIA_ENT_F_DTV_DEMOD, 693 demod, 0, 694 MEDIA_LNK_FL_ENABLED, 695 false); 696 } else { 697 pad_sink = media_get_pad_index(tuner, true, 698 PAD_SIGNAL_ANALOG); 699 if (pad_sink < 0) 700 return -EINVAL; 701 ret = media_create_pad_links(mdev, 702 MEDIA_ENT_F_CONN_RF, 703 conn, 0, 704 MEDIA_ENT_F_TUNER, 705 tuner, pad_sink, 706 MEDIA_LNK_FL_ENABLED, 707 false); 708 } 709 if (ret) 710 return ret; 711 } 712 713 if (ntuner && ndemod) { 714 /* NOTE: first found tuner source pad presumed correct */ 715 pad_source = media_get_pad_index(tuner, false, 716 PAD_SIGNAL_ANALOG); 717 if (pad_source < 0) 718 return -EINVAL; 719 ret = media_create_pad_links(mdev, 720 MEDIA_ENT_F_TUNER, 721 tuner, pad_source, 722 MEDIA_ENT_F_DTV_DEMOD, 723 demod, 0, MEDIA_LNK_FL_ENABLED, 724 false); 725 if (ret) 726 return ret; 727 } 728 729 if (ndemod && demux) { 730 ret = media_create_pad_links(mdev, 731 MEDIA_ENT_F_DTV_DEMOD, 732 demod, 1, 733 MEDIA_ENT_F_TS_DEMUX, 734 demux, 0, MEDIA_LNK_FL_ENABLED, 735 false); 736 if (ret) 737 return ret; 738 } 739 if (demux && ca) { 740 ret = media_create_pad_link(demux, 1, ca, 741 0, MEDIA_LNK_FL_ENABLED); 742 if (ret) 743 return ret; 744 } 745 746 /* Create demux links for each ringbuffer/pad */ 747 if (demux) { 748 media_device_for_each_entity(entity, mdev) { 749 if (entity->function == MEDIA_ENT_F_IO_DTV) { 750 if (!strncmp(entity->name, DVR_TSOUT, 751 strlen(DVR_TSOUT))) { 752 ret = media_create_pad_link(demux, 753 ++dvr_pad, 754 entity, 0, 0); 755 if (ret) 756 return ret; 757 } 758 if (!strncmp(entity->name, DEMUX_TSOUT, 759 strlen(DEMUX_TSOUT))) { 760 ret = media_create_pad_link(demux, 761 ++demux_pad, 762 entity, 0, 0); 763 if (ret) 764 return ret; 765 } 766 } 767 } 768 } 769 770 /* Create interface links for FE->tuner, DVR->demux and CA->ca */ 771 media_device_for_each_intf(intf, mdev) { 772 if (intf->type == MEDIA_INTF_T_DVB_CA && ca) { 773 link = media_create_intf_link(ca, intf, 774 MEDIA_LNK_FL_ENABLED | 775 MEDIA_LNK_FL_IMMUTABLE); 776 if (!link) 777 return -ENOMEM; 778 } 779 780 if (intf->type == MEDIA_INTF_T_DVB_FE && tuner) { 781 link = media_create_intf_link(tuner, intf, 782 MEDIA_LNK_FL_ENABLED | 783 MEDIA_LNK_FL_IMMUTABLE); 784 if (!link) 785 return -ENOMEM; 786 } 787 #if 0 788 /* 789 * Indirect link - let's not create yet, as we don't know how 790 * to handle indirect links, nor if this will 791 * actually be needed. 792 */ 793 if (intf->type == MEDIA_INTF_T_DVB_DVR && demux) { 794 link = media_create_intf_link(demux, intf, 795 MEDIA_LNK_FL_ENABLED | 796 MEDIA_LNK_FL_IMMUTABLE); 797 if (!link) 798 return -ENOMEM; 799 } 800 #endif 801 if (intf->type == MEDIA_INTF_T_DVB_DVR) { 802 ret = dvb_create_io_intf_links(adap, intf, DVR_TSOUT); 803 if (ret) 804 return ret; 805 } 806 if (intf->type == MEDIA_INTF_T_DVB_DEMUX) { 807 ret = dvb_create_io_intf_links(adap, intf, DEMUX_TSOUT); 808 if (ret) 809 return ret; 810 } 811 } 812 return 0; 813 } 814 EXPORT_SYMBOL_GPL(dvb_create_media_graph); 815 #endif 816 817 static int dvbdev_check_free_adapter_num(int num) 818 { 819 struct list_head *entry; 820 list_for_each(entry, &dvb_adapter_list) { 821 struct dvb_adapter *adap; 822 adap = list_entry(entry, struct dvb_adapter, list_head); 823 if (adap->num == num) 824 return 0; 825 } 826 return 1; 827 } 828 829 static int dvbdev_get_free_adapter_num (void) 830 { 831 int num = 0; 832 833 while (num < DVB_MAX_ADAPTERS) { 834 if (dvbdev_check_free_adapter_num(num)) 835 return num; 836 num++; 837 } 838 839 return -ENFILE; 840 } 841 842 843 int dvb_register_adapter(struct dvb_adapter *adap, const char *name, 844 struct module *module, struct device *device, 845 short *adapter_nums) 846 { 847 int i, num; 848 849 mutex_lock(&dvbdev_register_lock); 850 851 for (i = 0; i < DVB_MAX_ADAPTERS; ++i) { 852 num = adapter_nums[i]; 853 if (num >= 0 && num < DVB_MAX_ADAPTERS) { 854 /* use the one the driver asked for */ 855 if (dvbdev_check_free_adapter_num(num)) 856 break; 857 } else { 858 num = dvbdev_get_free_adapter_num(); 859 break; 860 } 861 num = -1; 862 } 863 864 if (num < 0) { 865 mutex_unlock(&dvbdev_register_lock); 866 return -ENFILE; 867 } 868 869 memset (adap, 0, sizeof(struct dvb_adapter)); 870 INIT_LIST_HEAD (&adap->device_list); 871 872 pr_info("DVB: registering new adapter (%s)\n", name); 873 874 adap->num = num; 875 adap->name = name; 876 adap->module = module; 877 adap->device = device; 878 adap->mfe_shared = 0; 879 adap->mfe_dvbdev = NULL; 880 mutex_init (&adap->mfe_lock); 881 882 #ifdef CONFIG_MEDIA_CONTROLLER_DVB 883 mutex_init(&adap->mdev_lock); 884 #endif 885 886 list_add_tail (&adap->list_head, &dvb_adapter_list); 887 888 mutex_unlock(&dvbdev_register_lock); 889 890 return num; 891 } 892 EXPORT_SYMBOL(dvb_register_adapter); 893 894 895 int dvb_unregister_adapter(struct dvb_adapter *adap) 896 { 897 mutex_lock(&dvbdev_register_lock); 898 list_del (&adap->list_head); 899 mutex_unlock(&dvbdev_register_lock); 900 return 0; 901 } 902 EXPORT_SYMBOL(dvb_unregister_adapter); 903 904 /* if the miracle happens and "generic_usercopy()" is included into 905 the kernel, then this can vanish. please don't make the mistake and 906 define this as video_usercopy(). this will introduce a dependency 907 to the v4l "videodev.o" module, which is unnecessary for some 908 cards (ie. the budget dvb-cards don't need the v4l module...) */ 909 int dvb_usercopy(struct file *file, 910 unsigned int cmd, unsigned long arg, 911 int (*func)(struct file *file, 912 unsigned int cmd, void *arg)) 913 { 914 char sbuf[128]; 915 void *mbuf = NULL; 916 void *parg = NULL; 917 int err = -EINVAL; 918 919 /* Copy arguments into temp kernel buffer */ 920 switch (_IOC_DIR(cmd)) { 921 case _IOC_NONE: 922 /* 923 * For this command, the pointer is actually an integer 924 * argument. 925 */ 926 parg = (void *) arg; 927 break; 928 case _IOC_READ: /* some v4l ioctls are marked wrong ... */ 929 case _IOC_WRITE: 930 case (_IOC_WRITE | _IOC_READ): 931 if (_IOC_SIZE(cmd) <= sizeof(sbuf)) { 932 parg = sbuf; 933 } else { 934 /* too big to allocate from stack */ 935 mbuf = kmalloc(_IOC_SIZE(cmd), GFP_KERNEL); 936 if (NULL == mbuf) 937 return -ENOMEM; 938 parg = mbuf; 939 } 940 941 err = -EFAULT; 942 if (copy_from_user(parg, (void __user *)arg, _IOC_SIZE(cmd))) 943 goto out; 944 break; 945 } 946 947 /* call driver */ 948 if ((err = func(file, cmd, parg)) == -ENOIOCTLCMD) 949 err = -ENOTTY; 950 951 if (err < 0) 952 goto out; 953 954 /* Copy results into user buffer */ 955 switch (_IOC_DIR(cmd)) 956 { 957 case _IOC_READ: 958 case (_IOC_WRITE | _IOC_READ): 959 if (copy_to_user((void __user *)arg, parg, _IOC_SIZE(cmd))) 960 err = -EFAULT; 961 break; 962 } 963 964 out: 965 kfree(mbuf); 966 return err; 967 } 968 969 #if IS_ENABLED(CONFIG_I2C) 970 struct i2c_client *dvb_module_probe(const char *module_name, 971 const char *name, 972 struct i2c_adapter *adap, 973 unsigned char addr, 974 void *platform_data) 975 { 976 struct i2c_client *client; 977 struct i2c_board_info *board_info; 978 979 board_info = kzalloc(sizeof(*board_info), GFP_KERNEL); 980 if (!board_info) 981 return NULL; 982 983 if (name) 984 strscpy(board_info->type, name, I2C_NAME_SIZE); 985 else 986 strscpy(board_info->type, module_name, I2C_NAME_SIZE); 987 988 board_info->addr = addr; 989 board_info->platform_data = platform_data; 990 request_module(module_name); 991 client = i2c_new_client_device(adap, board_info); 992 if (!i2c_client_has_driver(client)) { 993 kfree(board_info); 994 return NULL; 995 } 996 997 if (!try_module_get(client->dev.driver->owner)) { 998 i2c_unregister_device(client); 999 client = NULL; 1000 } 1001 1002 kfree(board_info); 1003 return client; 1004 } 1005 EXPORT_SYMBOL_GPL(dvb_module_probe); 1006 1007 void dvb_module_release(struct i2c_client *client) 1008 { 1009 if (!client) 1010 return; 1011 1012 module_put(client->dev.driver->owner); 1013 i2c_unregister_device(client); 1014 } 1015 EXPORT_SYMBOL_GPL(dvb_module_release); 1016 #endif 1017 1018 static int dvb_uevent(struct device *dev, struct kobj_uevent_env *env) 1019 { 1020 struct dvb_device *dvbdev = dev_get_drvdata(dev); 1021 1022 add_uevent_var(env, "DVB_ADAPTER_NUM=%d", dvbdev->adapter->num); 1023 add_uevent_var(env, "DVB_DEVICE_TYPE=%s", dnames[dvbdev->type]); 1024 add_uevent_var(env, "DVB_DEVICE_NUM=%d", dvbdev->id); 1025 return 0; 1026 } 1027 1028 static char *dvb_devnode(struct device *dev, umode_t *mode) 1029 { 1030 struct dvb_device *dvbdev = dev_get_drvdata(dev); 1031 1032 return kasprintf(GFP_KERNEL, "dvb/adapter%d/%s%d", 1033 dvbdev->adapter->num, dnames[dvbdev->type], dvbdev->id); 1034 } 1035 1036 1037 static int __init init_dvbdev(void) 1038 { 1039 int retval; 1040 dev_t dev = MKDEV(DVB_MAJOR, 0); 1041 1042 if ((retval = register_chrdev_region(dev, MAX_DVB_MINORS, "DVB")) != 0) { 1043 pr_err("dvb-core: unable to get major %d\n", DVB_MAJOR); 1044 return retval; 1045 } 1046 1047 cdev_init(&dvb_device_cdev, &dvb_device_fops); 1048 if ((retval = cdev_add(&dvb_device_cdev, dev, MAX_DVB_MINORS)) != 0) { 1049 pr_err("dvb-core: unable register character device\n"); 1050 goto error; 1051 } 1052 1053 dvb_class = class_create(THIS_MODULE, "dvb"); 1054 if (IS_ERR(dvb_class)) { 1055 retval = PTR_ERR(dvb_class); 1056 goto error; 1057 } 1058 dvb_class->dev_uevent = dvb_uevent; 1059 dvb_class->devnode = dvb_devnode; 1060 return 0; 1061 1062 error: 1063 cdev_del(&dvb_device_cdev); 1064 unregister_chrdev_region(dev, MAX_DVB_MINORS); 1065 return retval; 1066 } 1067 1068 1069 static void __exit exit_dvbdev(void) 1070 { 1071 class_destroy(dvb_class); 1072 cdev_del(&dvb_device_cdev); 1073 unregister_chrdev_region(MKDEV(DVB_MAJOR, 0), MAX_DVB_MINORS); 1074 } 1075 1076 subsys_initcall(init_dvbdev); 1077 module_exit(exit_dvbdev); 1078 1079 MODULE_DESCRIPTION("DVB Core Driver"); 1080 MODULE_AUTHOR("Marcus Metzler, Ralph Metzler, Holger Waechtler"); 1081 MODULE_LICENSE("GPL"); 1082