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