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 * You should have received a copy of the GNU Lesser General Public License 19 * along with this program; if not, write to the Free Software 20 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. 21 * 22 */ 23 24 #define pr_fmt(fmt) "dvbdev: " fmt 25 26 #include <linux/types.h> 27 #include <linux/errno.h> 28 #include <linux/string.h> 29 #include <linux/module.h> 30 #include <linux/kernel.h> 31 #include <linux/init.h> 32 #include <linux/slab.h> 33 #include <linux/device.h> 34 #include <linux/fs.h> 35 #include <linux/cdev.h> 36 #include <linux/mutex.h> 37 #include "dvbdev.h" 38 39 /* Due to enum tuner_pad_index */ 40 #include <media/tuner.h> 41 42 static DEFINE_MUTEX(dvbdev_mutex); 43 static int dvbdev_debug; 44 45 module_param(dvbdev_debug, int, 0644); 46 MODULE_PARM_DESC(dvbdev_debug, "Turn on/off device debugging (default:off)."); 47 48 #define dprintk(fmt, arg...) do { \ 49 if (dvbdev_debug) \ 50 printk(KERN_DEBUG pr_fmt("%s: " fmt), \ 51 __func__, ##arg); \ 52 } while (0) 53 54 static LIST_HEAD(dvb_adapter_list); 55 static DEFINE_MUTEX(dvbdev_register_lock); 56 57 static const char * const dnames[] = { 58 "video", "audio", "sec", "frontend", "demux", "dvr", "ca", 59 "net", "osd" 60 }; 61 62 #ifdef CONFIG_DVB_DYNAMIC_MINORS 63 #define MAX_DVB_MINORS 256 64 #define DVB_MAX_IDS MAX_DVB_MINORS 65 #else 66 #define DVB_MAX_IDS 4 67 #define nums2minor(num, type, id) ((num << 6) | (id << 4) | type) 68 #define MAX_DVB_MINORS (DVB_MAX_ADAPTERS*64) 69 #endif 70 71 static struct class *dvb_class; 72 73 static struct dvb_device *dvb_minors[MAX_DVB_MINORS]; 74 static DECLARE_RWSEM(minor_rwsem); 75 76 static int dvb_device_open(struct inode *inode, struct file *file) 77 { 78 struct dvb_device *dvbdev; 79 80 mutex_lock(&dvbdev_mutex); 81 down_read(&minor_rwsem); 82 dvbdev = dvb_minors[iminor(inode)]; 83 84 if (dvbdev && dvbdev->fops) { 85 int err = 0; 86 const struct file_operations *new_fops; 87 88 new_fops = fops_get(dvbdev->fops); 89 if (!new_fops) 90 goto fail; 91 file->private_data = dvbdev; 92 replace_fops(file, new_fops); 93 if (file->f_op->open) 94 err = file->f_op->open(inode, file); 95 up_read(&minor_rwsem); 96 mutex_unlock(&dvbdev_mutex); 97 return err; 98 } 99 fail: 100 up_read(&minor_rwsem); 101 mutex_unlock(&dvbdev_mutex); 102 return -ENODEV; 103 } 104 105 106 static const struct file_operations dvb_device_fops = 107 { 108 .owner = THIS_MODULE, 109 .open = dvb_device_open, 110 .llseek = noop_llseek, 111 }; 112 113 static struct cdev dvb_device_cdev; 114 115 int dvb_generic_open(struct inode *inode, struct file *file) 116 { 117 struct dvb_device *dvbdev = file->private_data; 118 119 if (!dvbdev) 120 return -ENODEV; 121 122 if (!dvbdev->users) 123 return -EBUSY; 124 125 if ((file->f_flags & O_ACCMODE) == O_RDONLY) { 126 if (!dvbdev->readers) 127 return -EBUSY; 128 dvbdev->readers--; 129 } else { 130 if (!dvbdev->writers) 131 return -EBUSY; 132 dvbdev->writers--; 133 } 134 135 dvbdev->users--; 136 return 0; 137 } 138 EXPORT_SYMBOL(dvb_generic_open); 139 140 141 int dvb_generic_release(struct inode *inode, struct file *file) 142 { 143 struct dvb_device *dvbdev = file->private_data; 144 145 if (!dvbdev) 146 return -ENODEV; 147 148 if ((file->f_flags & O_ACCMODE) == O_RDONLY) { 149 dvbdev->readers++; 150 } else { 151 dvbdev->writers++; 152 } 153 154 dvbdev->users++; 155 return 0; 156 } 157 EXPORT_SYMBOL(dvb_generic_release); 158 159 160 long dvb_generic_ioctl(struct file *file, 161 unsigned int cmd, unsigned long arg) 162 { 163 struct dvb_device *dvbdev = file->private_data; 164 165 if (!dvbdev) 166 return -ENODEV; 167 168 if (!dvbdev->kernel_ioctl) 169 return -EINVAL; 170 171 return dvb_usercopy(file, cmd, arg, dvbdev->kernel_ioctl); 172 } 173 EXPORT_SYMBOL(dvb_generic_ioctl); 174 175 176 static int dvbdev_get_free_id (struct dvb_adapter *adap, int type) 177 { 178 u32 id = 0; 179 180 while (id < DVB_MAX_IDS) { 181 struct dvb_device *dev; 182 list_for_each_entry(dev, &adap->device_list, list_head) 183 if (dev->type == type && dev->id == id) 184 goto skip; 185 return id; 186 skip: 187 id++; 188 } 189 return -ENFILE; 190 } 191 192 static void dvb_media_device_free(struct dvb_device *dvbdev) 193 { 194 #if defined(CONFIG_MEDIA_CONTROLLER_DVB) 195 if (dvbdev->entity) { 196 media_device_unregister_entity(dvbdev->entity); 197 kfree(dvbdev->entity); 198 kfree(dvbdev->pads); 199 dvbdev->entity = NULL; 200 dvbdev->pads = NULL; 201 } 202 203 if (dvbdev->tsout_entity) { 204 int i; 205 206 for (i = 0; i < dvbdev->tsout_num_entities; i++) { 207 media_device_unregister_entity(&dvbdev->tsout_entity[i]); 208 kfree(dvbdev->tsout_entity[i].name); 209 } 210 kfree(dvbdev->tsout_entity); 211 kfree(dvbdev->tsout_pads); 212 dvbdev->tsout_entity = NULL; 213 dvbdev->tsout_pads = NULL; 214 215 dvbdev->tsout_num_entities = 0; 216 } 217 218 if (dvbdev->intf_devnode) { 219 media_devnode_remove(dvbdev->intf_devnode); 220 dvbdev->intf_devnode = NULL; 221 } 222 223 if (dvbdev->adapter->conn) { 224 media_device_unregister_entity(dvbdev->adapter->conn); 225 dvbdev->adapter->conn = NULL; 226 kfree(dvbdev->adapter->conn_pads); 227 dvbdev->adapter->conn_pads = NULL; 228 } 229 #endif 230 } 231 232 #if defined(CONFIG_MEDIA_CONTROLLER_DVB) 233 static int dvb_create_tsout_entity(struct dvb_device *dvbdev, 234 const char *name, int npads) 235 { 236 int i, ret = 0; 237 238 dvbdev->tsout_pads = kcalloc(npads, sizeof(*dvbdev->tsout_pads), 239 GFP_KERNEL); 240 if (!dvbdev->tsout_pads) 241 return -ENOMEM; 242 243 dvbdev->tsout_entity = kcalloc(npads, sizeof(*dvbdev->tsout_entity), 244 GFP_KERNEL); 245 if (!dvbdev->tsout_entity) 246 return -ENOMEM; 247 248 dvbdev->tsout_num_entities = npads; 249 250 for (i = 0; i < npads; i++) { 251 struct media_pad *pads = &dvbdev->tsout_pads[i]; 252 struct media_entity *entity = &dvbdev->tsout_entity[i]; 253 254 entity->name = kasprintf(GFP_KERNEL, "%s #%d", name, i); 255 if (!entity->name) 256 return -ENOMEM; 257 258 entity->function = MEDIA_ENT_F_IO_DTV; 259 pads->flags = MEDIA_PAD_FL_SINK; 260 261 ret = media_entity_pads_init(entity, 1, pads); 262 if (ret < 0) 263 return ret; 264 265 ret = media_device_register_entity(dvbdev->adapter->mdev, 266 entity); 267 if (ret < 0) 268 return ret; 269 } 270 return 0; 271 } 272 273 #define DEMUX_TSOUT "demux-tsout" 274 #define DVR_TSOUT "dvr-tsout" 275 276 static int dvb_create_media_entity(struct dvb_device *dvbdev, 277 int type, int demux_sink_pads) 278 { 279 int i, ret, npads; 280 281 switch (type) { 282 case DVB_DEVICE_FRONTEND: 283 npads = 2; 284 break; 285 case DVB_DEVICE_DVR: 286 ret = dvb_create_tsout_entity(dvbdev, DVR_TSOUT, 287 demux_sink_pads); 288 return ret; 289 case DVB_DEVICE_DEMUX: 290 npads = 1 + demux_sink_pads; 291 ret = dvb_create_tsout_entity(dvbdev, DEMUX_TSOUT, 292 demux_sink_pads); 293 if (ret < 0) 294 return ret; 295 break; 296 case DVB_DEVICE_CA: 297 npads = 2; 298 break; 299 case DVB_DEVICE_NET: 300 /* 301 * We should be creating entities for the MPE/ULE 302 * decapsulation hardware (or software implementation). 303 * 304 * However, the number of for the MPE/ULE decaps may not be 305 * fixed. As we don't have yet dynamic support for PADs at 306 * the Media Controller, let's not create the decap 307 * entities yet. 308 */ 309 return 0; 310 default: 311 return 0; 312 } 313 314 dvbdev->entity = kzalloc(sizeof(*dvbdev->entity), GFP_KERNEL); 315 if (!dvbdev->entity) 316 return -ENOMEM; 317 318 dvbdev->entity->name = dvbdev->name; 319 320 if (npads) { 321 dvbdev->pads = kcalloc(npads, sizeof(*dvbdev->pads), 322 GFP_KERNEL); 323 if (!dvbdev->pads) 324 return -ENOMEM; 325 } 326 327 switch (type) { 328 case DVB_DEVICE_FRONTEND: 329 dvbdev->entity->function = MEDIA_ENT_F_DTV_DEMOD; 330 dvbdev->pads[0].flags = MEDIA_PAD_FL_SINK; 331 dvbdev->pads[1].flags = MEDIA_PAD_FL_SOURCE; 332 break; 333 case DVB_DEVICE_DEMUX: 334 dvbdev->entity->function = MEDIA_ENT_F_TS_DEMUX; 335 dvbdev->pads[0].flags = MEDIA_PAD_FL_SINK; 336 for (i = 1; i < npads; i++) 337 dvbdev->pads[i].flags = MEDIA_PAD_FL_SOURCE; 338 break; 339 case DVB_DEVICE_CA: 340 dvbdev->entity->function = MEDIA_ENT_F_DTV_CA; 341 dvbdev->pads[0].flags = MEDIA_PAD_FL_SINK; 342 dvbdev->pads[1].flags = MEDIA_PAD_FL_SOURCE; 343 break; 344 default: 345 /* Should never happen, as the first switch prevents it */ 346 kfree(dvbdev->entity); 347 kfree(dvbdev->pads); 348 dvbdev->entity = NULL; 349 dvbdev->pads = NULL; 350 return 0; 351 } 352 353 if (npads) { 354 ret = media_entity_pads_init(dvbdev->entity, npads, dvbdev->pads); 355 if (ret) 356 return ret; 357 } 358 ret = media_device_register_entity(dvbdev->adapter->mdev, 359 dvbdev->entity); 360 if (ret) 361 return ret; 362 363 pr_info("%s: media entity '%s' registered.\n", 364 __func__, dvbdev->entity->name); 365 366 return 0; 367 } 368 #endif 369 370 static int dvb_register_media_device(struct dvb_device *dvbdev, 371 int type, int minor, 372 unsigned demux_sink_pads) 373 { 374 #if defined(CONFIG_MEDIA_CONTROLLER_DVB) 375 struct media_link *link; 376 u32 intf_type; 377 int ret; 378 379 if (!dvbdev->adapter->mdev) 380 return 0; 381 382 ret = dvb_create_media_entity(dvbdev, type, demux_sink_pads); 383 if (ret) 384 return ret; 385 386 switch (type) { 387 case DVB_DEVICE_FRONTEND: 388 intf_type = MEDIA_INTF_T_DVB_FE; 389 break; 390 case DVB_DEVICE_DEMUX: 391 intf_type = MEDIA_INTF_T_DVB_DEMUX; 392 break; 393 case DVB_DEVICE_DVR: 394 intf_type = MEDIA_INTF_T_DVB_DVR; 395 break; 396 case DVB_DEVICE_CA: 397 intf_type = MEDIA_INTF_T_DVB_CA; 398 break; 399 case DVB_DEVICE_NET: 400 intf_type = MEDIA_INTF_T_DVB_NET; 401 break; 402 default: 403 return 0; 404 } 405 406 dvbdev->intf_devnode = media_devnode_create(dvbdev->adapter->mdev, 407 intf_type, 0, 408 DVB_MAJOR, minor); 409 410 if (!dvbdev->intf_devnode) 411 return -ENOMEM; 412 413 /* 414 * Create the "obvious" link, e. g. the ones that represent 415 * a direct association between an interface and an entity. 416 * Other links should be created elsewhere, like: 417 * DVB FE intf -> tuner 418 * DVB demux intf -> dvr 419 */ 420 421 if (!dvbdev->entity) 422 return 0; 423 424 link = media_create_intf_link(dvbdev->entity, &dvbdev->intf_devnode->intf, 425 MEDIA_LNK_FL_ENABLED); 426 if (!link) 427 return -ENOMEM; 428 #endif 429 return 0; 430 } 431 432 int dvb_register_device(struct dvb_adapter *adap, struct dvb_device **pdvbdev, 433 const struct dvb_device *template, void *priv, int type, 434 int demux_sink_pads) 435 { 436 struct dvb_device *dvbdev; 437 struct file_operations *dvbdevfops; 438 struct device *clsdev; 439 int minor; 440 int id, ret; 441 442 mutex_lock(&dvbdev_register_lock); 443 444 if ((id = dvbdev_get_free_id (adap, type)) < 0){ 445 mutex_unlock(&dvbdev_register_lock); 446 *pdvbdev = NULL; 447 pr_err("%s: couldn't find free device id\n", __func__); 448 return -ENFILE; 449 } 450 451 *pdvbdev = dvbdev = kzalloc(sizeof(*dvbdev), GFP_KERNEL); 452 453 if (!dvbdev){ 454 mutex_unlock(&dvbdev_register_lock); 455 return -ENOMEM; 456 } 457 458 dvbdevfops = kzalloc(sizeof(struct file_operations), GFP_KERNEL); 459 460 if (!dvbdevfops){ 461 kfree (dvbdev); 462 mutex_unlock(&dvbdev_register_lock); 463 return -ENOMEM; 464 } 465 466 memcpy(dvbdev, template, sizeof(struct dvb_device)); 467 dvbdev->type = type; 468 dvbdev->id = id; 469 dvbdev->adapter = adap; 470 dvbdev->priv = priv; 471 dvbdev->fops = dvbdevfops; 472 init_waitqueue_head (&dvbdev->wait_queue); 473 474 memcpy(dvbdevfops, template->fops, sizeof(struct file_operations)); 475 dvbdevfops->owner = adap->module; 476 477 list_add_tail (&dvbdev->list_head, &adap->device_list); 478 479 down_write(&minor_rwsem); 480 #ifdef CONFIG_DVB_DYNAMIC_MINORS 481 for (minor = 0; minor < MAX_DVB_MINORS; minor++) 482 if (dvb_minors[minor] == NULL) 483 break; 484 485 if (minor == MAX_DVB_MINORS) { 486 kfree(dvbdevfops); 487 kfree(dvbdev); 488 up_write(&minor_rwsem); 489 mutex_unlock(&dvbdev_register_lock); 490 return -EINVAL; 491 } 492 #else 493 minor = nums2minor(adap->num, type, id); 494 #endif 495 496 dvbdev->minor = minor; 497 dvb_minors[minor] = dvbdev; 498 up_write(&minor_rwsem); 499 500 ret = dvb_register_media_device(dvbdev, type, minor, demux_sink_pads); 501 if (ret) { 502 pr_err("%s: dvb_register_media_device failed to create the mediagraph\n", 503 __func__); 504 505 dvb_media_device_free(dvbdev); 506 kfree(dvbdevfops); 507 kfree(dvbdev); 508 up_write(&minor_rwsem); 509 mutex_unlock(&dvbdev_register_lock); 510 return ret; 511 } 512 513 mutex_unlock(&dvbdev_register_lock); 514 515 clsdev = device_create(dvb_class, adap->device, 516 MKDEV(DVB_MAJOR, minor), 517 dvbdev, "dvb%d.%s%d", adap->num, dnames[type], id); 518 if (IS_ERR(clsdev)) { 519 pr_err("%s: failed to create device dvb%d.%s%d (%ld)\n", 520 __func__, adap->num, dnames[type], id, PTR_ERR(clsdev)); 521 return PTR_ERR(clsdev); 522 } 523 dprintk("DVB: register adapter%d/%s%d @ minor: %i (0x%02x)\n", 524 adap->num, dnames[type], id, minor, minor); 525 526 return 0; 527 } 528 EXPORT_SYMBOL(dvb_register_device); 529 530 531 void dvb_remove_device(struct dvb_device *dvbdev) 532 { 533 if (!dvbdev) 534 return; 535 536 down_write(&minor_rwsem); 537 dvb_minors[dvbdev->minor] = NULL; 538 up_write(&minor_rwsem); 539 540 dvb_media_device_free(dvbdev); 541 542 device_destroy(dvb_class, MKDEV(DVB_MAJOR, dvbdev->minor)); 543 544 list_del (&dvbdev->list_head); 545 } 546 EXPORT_SYMBOL(dvb_remove_device); 547 548 549 void dvb_free_device(struct dvb_device *dvbdev) 550 { 551 if (!dvbdev) 552 return; 553 554 kfree (dvbdev->fops); 555 kfree (dvbdev); 556 } 557 EXPORT_SYMBOL(dvb_free_device); 558 559 560 void dvb_unregister_device(struct dvb_device *dvbdev) 561 { 562 dvb_remove_device(dvbdev); 563 dvb_free_device(dvbdev); 564 } 565 EXPORT_SYMBOL(dvb_unregister_device); 566 567 568 #ifdef CONFIG_MEDIA_CONTROLLER_DVB 569 570 static int dvb_create_io_intf_links(struct dvb_adapter *adap, 571 struct media_interface *intf, 572 char *name) 573 { 574 struct media_device *mdev = adap->mdev; 575 struct media_entity *entity; 576 struct media_link *link; 577 578 media_device_for_each_entity(entity, mdev) { 579 if (entity->function == MEDIA_ENT_F_IO_DTV) { 580 if (strncmp(entity->name, name, strlen(name))) 581 continue; 582 link = media_create_intf_link(entity, intf, 583 MEDIA_LNK_FL_ENABLED); 584 if (!link) 585 return -ENOMEM; 586 } 587 } 588 return 0; 589 } 590 591 int dvb_create_media_graph(struct dvb_adapter *adap, 592 bool create_rf_connector) 593 { 594 struct media_device *mdev = adap->mdev; 595 struct media_entity *entity, *tuner = NULL, *demod = NULL, *conn; 596 struct media_entity *demux = NULL, *ca = NULL; 597 struct media_link *link; 598 struct media_interface *intf; 599 unsigned demux_pad = 0; 600 unsigned dvr_pad = 0; 601 unsigned ntuner = 0, ndemod = 0; 602 int ret; 603 static const char *connector_name = "Television"; 604 605 if (!mdev) 606 return 0; 607 608 media_device_for_each_entity(entity, mdev) { 609 switch (entity->function) { 610 case MEDIA_ENT_F_TUNER: 611 tuner = entity; 612 ntuner++; 613 break; 614 case MEDIA_ENT_F_DTV_DEMOD: 615 demod = entity; 616 ndemod++; 617 break; 618 case MEDIA_ENT_F_TS_DEMUX: 619 demux = entity; 620 break; 621 case MEDIA_ENT_F_DTV_CA: 622 ca = entity; 623 break; 624 } 625 } 626 627 /* 628 * Prepare to signalize to media_create_pad_links() that multiple 629 * entities of the same type exists and a 1:n or n:1 links need to be 630 * created. 631 * NOTE: if both tuner and demod have multiple instances, it is up 632 * to the caller driver to create such links. 633 */ 634 if (ntuner > 1) 635 tuner = NULL; 636 if (ndemod > 1) 637 demod = NULL; 638 639 if (create_rf_connector) { 640 conn = kzalloc(sizeof(*conn), GFP_KERNEL); 641 if (!conn) 642 return -ENOMEM; 643 adap->conn = conn; 644 645 adap->conn_pads = kzalloc(sizeof(*adap->conn_pads), GFP_KERNEL); 646 if (!adap->conn_pads) 647 return -ENOMEM; 648 649 conn->flags = MEDIA_ENT_FL_CONNECTOR; 650 conn->function = MEDIA_ENT_F_CONN_RF; 651 conn->name = connector_name; 652 adap->conn_pads->flags = MEDIA_PAD_FL_SOURCE; 653 654 ret = media_entity_pads_init(conn, 1, adap->conn_pads); 655 if (ret) 656 return ret; 657 658 ret = media_device_register_entity(mdev, conn); 659 if (ret) 660 return ret; 661 662 if (!ntuner) 663 ret = media_create_pad_links(mdev, 664 MEDIA_ENT_F_CONN_RF, 665 conn, 0, 666 MEDIA_ENT_F_DTV_DEMOD, 667 demod, 0, 668 MEDIA_LNK_FL_ENABLED, 669 false); 670 else 671 ret = media_create_pad_links(mdev, 672 MEDIA_ENT_F_CONN_RF, 673 conn, 0, 674 MEDIA_ENT_F_TUNER, 675 tuner, TUNER_PAD_RF_INPUT, 676 MEDIA_LNK_FL_ENABLED, 677 false); 678 if (ret) 679 return ret; 680 } 681 682 if (ntuner && ndemod) { 683 ret = media_create_pad_links(mdev, 684 MEDIA_ENT_F_TUNER, 685 tuner, TUNER_PAD_OUTPUT, 686 MEDIA_ENT_F_DTV_DEMOD, 687 demod, 0, MEDIA_LNK_FL_ENABLED, 688 false); 689 if (ret) 690 return ret; 691 } 692 693 if (ndemod && demux) { 694 ret = media_create_pad_links(mdev, 695 MEDIA_ENT_F_DTV_DEMOD, 696 demod, 1, 697 MEDIA_ENT_F_TS_DEMUX, 698 demux, 0, MEDIA_LNK_FL_ENABLED, 699 false); 700 if (ret) 701 return ret; 702 } 703 if (demux && ca) { 704 ret = media_create_pad_link(demux, 1, ca, 705 0, MEDIA_LNK_FL_ENABLED); 706 if (ret) 707 return ret; 708 } 709 710 /* Create demux links for each ringbuffer/pad */ 711 if (demux) { 712 media_device_for_each_entity(entity, mdev) { 713 if (entity->function == MEDIA_ENT_F_IO_DTV) { 714 if (!strncmp(entity->name, DVR_TSOUT, 715 strlen(DVR_TSOUT))) { 716 ret = media_create_pad_link(demux, 717 ++dvr_pad, 718 entity, 0, 0); 719 if (ret) 720 return ret; 721 } 722 if (!strncmp(entity->name, DEMUX_TSOUT, 723 strlen(DEMUX_TSOUT))) { 724 ret = media_create_pad_link(demux, 725 ++demux_pad, 726 entity, 0, 0); 727 if (ret) 728 return ret; 729 } 730 } 731 } 732 } 733 734 /* Create interface links for FE->tuner, DVR->demux and CA->ca */ 735 media_device_for_each_intf(intf, mdev) { 736 if (intf->type == MEDIA_INTF_T_DVB_CA && ca) { 737 link = media_create_intf_link(ca, intf, 738 MEDIA_LNK_FL_ENABLED); 739 if (!link) 740 return -ENOMEM; 741 } 742 743 if (intf->type == MEDIA_INTF_T_DVB_FE && tuner) { 744 link = media_create_intf_link(tuner, intf, 745 MEDIA_LNK_FL_ENABLED); 746 if (!link) 747 return -ENOMEM; 748 } 749 #if 0 750 /* 751 * Indirect link - let's not create yet, as we don't know how 752 * to handle indirect links, nor if this will 753 * actually be needed. 754 */ 755 if (intf->type == MEDIA_INTF_T_DVB_DVR && demux) { 756 link = media_create_intf_link(demux, intf, 757 MEDIA_LNK_FL_ENABLED); 758 if (!link) 759 return -ENOMEM; 760 } 761 #endif 762 if (intf->type == MEDIA_INTF_T_DVB_DVR) { 763 ret = dvb_create_io_intf_links(adap, intf, DVR_TSOUT); 764 if (ret) 765 return ret; 766 } 767 if (intf->type == MEDIA_INTF_T_DVB_DEMUX) { 768 ret = dvb_create_io_intf_links(adap, intf, DEMUX_TSOUT); 769 if (ret) 770 return ret; 771 } 772 } 773 return 0; 774 } 775 EXPORT_SYMBOL_GPL(dvb_create_media_graph); 776 #endif 777 778 static int dvbdev_check_free_adapter_num(int num) 779 { 780 struct list_head *entry; 781 list_for_each(entry, &dvb_adapter_list) { 782 struct dvb_adapter *adap; 783 adap = list_entry(entry, struct dvb_adapter, list_head); 784 if (adap->num == num) 785 return 0; 786 } 787 return 1; 788 } 789 790 static int dvbdev_get_free_adapter_num (void) 791 { 792 int num = 0; 793 794 while (num < DVB_MAX_ADAPTERS) { 795 if (dvbdev_check_free_adapter_num(num)) 796 return num; 797 num++; 798 } 799 800 return -ENFILE; 801 } 802 803 804 int dvb_register_adapter(struct dvb_adapter *adap, const char *name, 805 struct module *module, struct device *device, 806 short *adapter_nums) 807 { 808 int i, num; 809 810 mutex_lock(&dvbdev_register_lock); 811 812 for (i = 0; i < DVB_MAX_ADAPTERS; ++i) { 813 num = adapter_nums[i]; 814 if (num >= 0 && num < DVB_MAX_ADAPTERS) { 815 /* use the one the driver asked for */ 816 if (dvbdev_check_free_adapter_num(num)) 817 break; 818 } else { 819 num = dvbdev_get_free_adapter_num(); 820 break; 821 } 822 num = -1; 823 } 824 825 if (num < 0) { 826 mutex_unlock(&dvbdev_register_lock); 827 return -ENFILE; 828 } 829 830 memset (adap, 0, sizeof(struct dvb_adapter)); 831 INIT_LIST_HEAD (&adap->device_list); 832 833 pr_info("DVB: registering new adapter (%s)\n", name); 834 835 adap->num = num; 836 adap->name = name; 837 adap->module = module; 838 adap->device = device; 839 adap->mfe_shared = 0; 840 adap->mfe_dvbdev = NULL; 841 mutex_init (&adap->mfe_lock); 842 843 list_add_tail (&adap->list_head, &dvb_adapter_list); 844 845 mutex_unlock(&dvbdev_register_lock); 846 847 return num; 848 } 849 EXPORT_SYMBOL(dvb_register_adapter); 850 851 852 int dvb_unregister_adapter(struct dvb_adapter *adap) 853 { 854 mutex_lock(&dvbdev_register_lock); 855 list_del (&adap->list_head); 856 mutex_unlock(&dvbdev_register_lock); 857 return 0; 858 } 859 EXPORT_SYMBOL(dvb_unregister_adapter); 860 861 /* if the miracle happens and "generic_usercopy()" is included into 862 the kernel, then this can vanish. please don't make the mistake and 863 define this as video_usercopy(). this will introduce a dependecy 864 to the v4l "videodev.o" module, which is unnecessary for some 865 cards (ie. the budget dvb-cards don't need the v4l module...) */ 866 int dvb_usercopy(struct file *file, 867 unsigned int cmd, unsigned long arg, 868 int (*func)(struct file *file, 869 unsigned int cmd, void *arg)) 870 { 871 char sbuf[128]; 872 void *mbuf = NULL; 873 void *parg = NULL; 874 int err = -EINVAL; 875 876 /* Copy arguments into temp kernel buffer */ 877 switch (_IOC_DIR(cmd)) { 878 case _IOC_NONE: 879 /* 880 * For this command, the pointer is actually an integer 881 * argument. 882 */ 883 parg = (void *) arg; 884 break; 885 case _IOC_READ: /* some v4l ioctls are marked wrong ... */ 886 case _IOC_WRITE: 887 case (_IOC_WRITE | _IOC_READ): 888 if (_IOC_SIZE(cmd) <= sizeof(sbuf)) { 889 parg = sbuf; 890 } else { 891 /* too big to allocate from stack */ 892 mbuf = kmalloc(_IOC_SIZE(cmd), GFP_KERNEL); 893 if (NULL == mbuf) 894 return -ENOMEM; 895 parg = mbuf; 896 } 897 898 err = -EFAULT; 899 if (copy_from_user(parg, (void __user *)arg, _IOC_SIZE(cmd))) 900 goto out; 901 break; 902 } 903 904 /* call driver */ 905 if ((err = func(file, cmd, parg)) == -ENOIOCTLCMD) 906 err = -ENOTTY; 907 908 if (err < 0) 909 goto out; 910 911 /* Copy results into user buffer */ 912 switch (_IOC_DIR(cmd)) 913 { 914 case _IOC_READ: 915 case (_IOC_WRITE | _IOC_READ): 916 if (copy_to_user((void __user *)arg, parg, _IOC_SIZE(cmd))) 917 err = -EFAULT; 918 break; 919 } 920 921 out: 922 kfree(mbuf); 923 return err; 924 } 925 926 static int dvb_uevent(struct device *dev, struct kobj_uevent_env *env) 927 { 928 struct dvb_device *dvbdev = dev_get_drvdata(dev); 929 930 add_uevent_var(env, "DVB_ADAPTER_NUM=%d", dvbdev->adapter->num); 931 add_uevent_var(env, "DVB_DEVICE_TYPE=%s", dnames[dvbdev->type]); 932 add_uevent_var(env, "DVB_DEVICE_NUM=%d", dvbdev->id); 933 return 0; 934 } 935 936 static char *dvb_devnode(struct device *dev, umode_t *mode) 937 { 938 struct dvb_device *dvbdev = dev_get_drvdata(dev); 939 940 return kasprintf(GFP_KERNEL, "dvb/adapter%d/%s%d", 941 dvbdev->adapter->num, dnames[dvbdev->type], dvbdev->id); 942 } 943 944 945 static int __init init_dvbdev(void) 946 { 947 int retval; 948 dev_t dev = MKDEV(DVB_MAJOR, 0); 949 950 if ((retval = register_chrdev_region(dev, MAX_DVB_MINORS, "DVB")) != 0) { 951 pr_err("dvb-core: unable to get major %d\n", DVB_MAJOR); 952 return retval; 953 } 954 955 cdev_init(&dvb_device_cdev, &dvb_device_fops); 956 if ((retval = cdev_add(&dvb_device_cdev, dev, MAX_DVB_MINORS)) != 0) { 957 pr_err("dvb-core: unable register character device\n"); 958 goto error; 959 } 960 961 dvb_class = class_create(THIS_MODULE, "dvb"); 962 if (IS_ERR(dvb_class)) { 963 retval = PTR_ERR(dvb_class); 964 goto error; 965 } 966 dvb_class->dev_uevent = dvb_uevent; 967 dvb_class->devnode = dvb_devnode; 968 return 0; 969 970 error: 971 cdev_del(&dvb_device_cdev); 972 unregister_chrdev_region(dev, MAX_DVB_MINORS); 973 return retval; 974 } 975 976 977 static void __exit exit_dvbdev(void) 978 { 979 class_destroy(dvb_class); 980 cdev_del(&dvb_device_cdev); 981 unregister_chrdev_region(MKDEV(DVB_MAJOR, 0), MAX_DVB_MINORS); 982 } 983 984 subsys_initcall(init_dvbdev); 985 module_exit(exit_dvbdev); 986 987 MODULE_DESCRIPTION("DVB Core Driver"); 988 MODULE_AUTHOR("Marcus Metzler, Ralph Metzler, Holger Waechtler"); 989 MODULE_LICENSE("GPL"); 990