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_unregister_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 kfree (dvbdev->fops); 546 kfree (dvbdev); 547 } 548 EXPORT_SYMBOL(dvb_unregister_device); 549 550 551 #ifdef CONFIG_MEDIA_CONTROLLER_DVB 552 553 static int dvb_create_io_intf_links(struct dvb_adapter *adap, 554 struct media_interface *intf, 555 char *name) 556 { 557 struct media_device *mdev = adap->mdev; 558 struct media_entity *entity; 559 struct media_link *link; 560 561 media_device_for_each_entity(entity, mdev) { 562 if (entity->function == MEDIA_ENT_F_IO_DTV) { 563 if (strncmp(entity->name, name, strlen(name))) 564 continue; 565 link = media_create_intf_link(entity, intf, 566 MEDIA_LNK_FL_ENABLED); 567 if (!link) 568 return -ENOMEM; 569 } 570 } 571 return 0; 572 } 573 574 int dvb_create_media_graph(struct dvb_adapter *adap, 575 bool create_rf_connector) 576 { 577 struct media_device *mdev = adap->mdev; 578 struct media_entity *entity, *tuner = NULL, *demod = NULL, *conn; 579 struct media_entity *demux = NULL, *ca = NULL; 580 struct media_link *link; 581 struct media_interface *intf; 582 unsigned demux_pad = 0; 583 unsigned dvr_pad = 0; 584 unsigned ntuner = 0, ndemod = 0; 585 int ret; 586 static const char *connector_name = "Television"; 587 588 if (!mdev) 589 return 0; 590 591 media_device_for_each_entity(entity, mdev) { 592 switch (entity->function) { 593 case MEDIA_ENT_F_TUNER: 594 tuner = entity; 595 ntuner++; 596 break; 597 case MEDIA_ENT_F_DTV_DEMOD: 598 demod = entity; 599 ndemod++; 600 break; 601 case MEDIA_ENT_F_TS_DEMUX: 602 demux = entity; 603 break; 604 case MEDIA_ENT_F_DTV_CA: 605 ca = entity; 606 break; 607 } 608 } 609 610 /* 611 * Prepare to signalize to media_create_pad_links() that multiple 612 * entities of the same type exists and a 1:n or n:1 links need to be 613 * created. 614 * NOTE: if both tuner and demod have multiple instances, it is up 615 * to the caller driver to create such links. 616 */ 617 if (ntuner > 1) 618 tuner = NULL; 619 if (ndemod > 1) 620 demod = NULL; 621 622 if (create_rf_connector) { 623 conn = kzalloc(sizeof(*conn), GFP_KERNEL); 624 if (!conn) 625 return -ENOMEM; 626 adap->conn = conn; 627 628 adap->conn_pads = kzalloc(sizeof(*adap->conn_pads), GFP_KERNEL); 629 if (!adap->conn_pads) 630 return -ENOMEM; 631 632 conn->flags = MEDIA_ENT_FL_CONNECTOR; 633 conn->function = MEDIA_ENT_F_CONN_RF; 634 conn->name = connector_name; 635 adap->conn_pads->flags = MEDIA_PAD_FL_SOURCE; 636 637 ret = media_entity_pads_init(conn, 1, adap->conn_pads); 638 if (ret) 639 return ret; 640 641 ret = media_device_register_entity(mdev, conn); 642 if (ret) 643 return ret; 644 645 if (!ntuner) 646 ret = media_create_pad_links(mdev, 647 MEDIA_ENT_F_CONN_RF, 648 conn, 0, 649 MEDIA_ENT_F_DTV_DEMOD, 650 demod, 0, 651 MEDIA_LNK_FL_ENABLED, 652 false); 653 else 654 ret = media_create_pad_links(mdev, 655 MEDIA_ENT_F_CONN_RF, 656 conn, 0, 657 MEDIA_ENT_F_TUNER, 658 tuner, TUNER_PAD_RF_INPUT, 659 MEDIA_LNK_FL_ENABLED, 660 false); 661 if (ret) 662 return ret; 663 } 664 665 if (ntuner && ndemod) { 666 ret = media_create_pad_links(mdev, 667 MEDIA_ENT_F_TUNER, 668 tuner, TUNER_PAD_OUTPUT, 669 MEDIA_ENT_F_DTV_DEMOD, 670 demod, 0, MEDIA_LNK_FL_ENABLED, 671 false); 672 if (ret) 673 return ret; 674 } 675 676 if (ndemod && demux) { 677 ret = media_create_pad_links(mdev, 678 MEDIA_ENT_F_DTV_DEMOD, 679 demod, 1, 680 MEDIA_ENT_F_TS_DEMUX, 681 demux, 0, MEDIA_LNK_FL_ENABLED, 682 false); 683 if (ret) 684 return ret; 685 } 686 if (demux && ca) { 687 ret = media_create_pad_link(demux, 1, ca, 688 0, MEDIA_LNK_FL_ENABLED); 689 if (ret) 690 return ret; 691 } 692 693 /* Create demux links for each ringbuffer/pad */ 694 if (demux) { 695 media_device_for_each_entity(entity, mdev) { 696 if (entity->function == MEDIA_ENT_F_IO_DTV) { 697 if (!strncmp(entity->name, DVR_TSOUT, 698 strlen(DVR_TSOUT))) { 699 ret = media_create_pad_link(demux, 700 ++dvr_pad, 701 entity, 0, 0); 702 if (ret) 703 return ret; 704 } 705 if (!strncmp(entity->name, DEMUX_TSOUT, 706 strlen(DEMUX_TSOUT))) { 707 ret = media_create_pad_link(demux, 708 ++demux_pad, 709 entity, 0, 0); 710 if (ret) 711 return ret; 712 } 713 } 714 } 715 } 716 717 /* Create interface links for FE->tuner, DVR->demux and CA->ca */ 718 media_device_for_each_intf(intf, mdev) { 719 if (intf->type == MEDIA_INTF_T_DVB_CA && ca) { 720 link = media_create_intf_link(ca, intf, 721 MEDIA_LNK_FL_ENABLED); 722 if (!link) 723 return -ENOMEM; 724 } 725 726 if (intf->type == MEDIA_INTF_T_DVB_FE && tuner) { 727 link = media_create_intf_link(tuner, intf, 728 MEDIA_LNK_FL_ENABLED); 729 if (!link) 730 return -ENOMEM; 731 } 732 #if 0 733 /* 734 * Indirect link - let's not create yet, as we don't know how 735 * to handle indirect links, nor if this will 736 * actually be needed. 737 */ 738 if (intf->type == MEDIA_INTF_T_DVB_DVR && demux) { 739 link = media_create_intf_link(demux, intf, 740 MEDIA_LNK_FL_ENABLED); 741 if (!link) 742 return -ENOMEM; 743 } 744 #endif 745 if (intf->type == MEDIA_INTF_T_DVB_DVR) { 746 ret = dvb_create_io_intf_links(adap, intf, DVR_TSOUT); 747 if (ret) 748 return ret; 749 } 750 if (intf->type == MEDIA_INTF_T_DVB_DEMUX) { 751 ret = dvb_create_io_intf_links(adap, intf, DEMUX_TSOUT); 752 if (ret) 753 return ret; 754 } 755 } 756 return 0; 757 } 758 EXPORT_SYMBOL_GPL(dvb_create_media_graph); 759 #endif 760 761 static int dvbdev_check_free_adapter_num(int num) 762 { 763 struct list_head *entry; 764 list_for_each(entry, &dvb_adapter_list) { 765 struct dvb_adapter *adap; 766 adap = list_entry(entry, struct dvb_adapter, list_head); 767 if (adap->num == num) 768 return 0; 769 } 770 return 1; 771 } 772 773 static int dvbdev_get_free_adapter_num (void) 774 { 775 int num = 0; 776 777 while (num < DVB_MAX_ADAPTERS) { 778 if (dvbdev_check_free_adapter_num(num)) 779 return num; 780 num++; 781 } 782 783 return -ENFILE; 784 } 785 786 787 int dvb_register_adapter(struct dvb_adapter *adap, const char *name, 788 struct module *module, struct device *device, 789 short *adapter_nums) 790 { 791 int i, num; 792 793 mutex_lock(&dvbdev_register_lock); 794 795 for (i = 0; i < DVB_MAX_ADAPTERS; ++i) { 796 num = adapter_nums[i]; 797 if (num >= 0 && num < DVB_MAX_ADAPTERS) { 798 /* use the one the driver asked for */ 799 if (dvbdev_check_free_adapter_num(num)) 800 break; 801 } else { 802 num = dvbdev_get_free_adapter_num(); 803 break; 804 } 805 num = -1; 806 } 807 808 if (num < 0) { 809 mutex_unlock(&dvbdev_register_lock); 810 return -ENFILE; 811 } 812 813 memset (adap, 0, sizeof(struct dvb_adapter)); 814 INIT_LIST_HEAD (&adap->device_list); 815 816 pr_info("DVB: registering new adapter (%s)\n", name); 817 818 adap->num = num; 819 adap->name = name; 820 adap->module = module; 821 adap->device = device; 822 adap->mfe_shared = 0; 823 adap->mfe_dvbdev = NULL; 824 mutex_init (&adap->mfe_lock); 825 826 list_add_tail (&adap->list_head, &dvb_adapter_list); 827 828 mutex_unlock(&dvbdev_register_lock); 829 830 return num; 831 } 832 EXPORT_SYMBOL(dvb_register_adapter); 833 834 835 int dvb_unregister_adapter(struct dvb_adapter *adap) 836 { 837 mutex_lock(&dvbdev_register_lock); 838 list_del (&adap->list_head); 839 mutex_unlock(&dvbdev_register_lock); 840 return 0; 841 } 842 EXPORT_SYMBOL(dvb_unregister_adapter); 843 844 /* if the miracle happens and "generic_usercopy()" is included into 845 the kernel, then this can vanish. please don't make the mistake and 846 define this as video_usercopy(). this will introduce a dependecy 847 to the v4l "videodev.o" module, which is unnecessary for some 848 cards (ie. the budget dvb-cards don't need the v4l module...) */ 849 int dvb_usercopy(struct file *file, 850 unsigned int cmd, unsigned long arg, 851 int (*func)(struct file *file, 852 unsigned int cmd, void *arg)) 853 { 854 char sbuf[128]; 855 void *mbuf = NULL; 856 void *parg = NULL; 857 int err = -EINVAL; 858 859 /* Copy arguments into temp kernel buffer */ 860 switch (_IOC_DIR(cmd)) { 861 case _IOC_NONE: 862 /* 863 * For this command, the pointer is actually an integer 864 * argument. 865 */ 866 parg = (void *) arg; 867 break; 868 case _IOC_READ: /* some v4l ioctls are marked wrong ... */ 869 case _IOC_WRITE: 870 case (_IOC_WRITE | _IOC_READ): 871 if (_IOC_SIZE(cmd) <= sizeof(sbuf)) { 872 parg = sbuf; 873 } else { 874 /* too big to allocate from stack */ 875 mbuf = kmalloc(_IOC_SIZE(cmd), GFP_KERNEL); 876 if (NULL == mbuf) 877 return -ENOMEM; 878 parg = mbuf; 879 } 880 881 err = -EFAULT; 882 if (copy_from_user(parg, (void __user *)arg, _IOC_SIZE(cmd))) 883 goto out; 884 break; 885 } 886 887 /* call driver */ 888 if ((err = func(file, cmd, parg)) == -ENOIOCTLCMD) 889 err = -ENOTTY; 890 891 if (err < 0) 892 goto out; 893 894 /* Copy results into user buffer */ 895 switch (_IOC_DIR(cmd)) 896 { 897 case _IOC_READ: 898 case (_IOC_WRITE | _IOC_READ): 899 if (copy_to_user((void __user *)arg, parg, _IOC_SIZE(cmd))) 900 err = -EFAULT; 901 break; 902 } 903 904 out: 905 kfree(mbuf); 906 return err; 907 } 908 909 static int dvb_uevent(struct device *dev, struct kobj_uevent_env *env) 910 { 911 struct dvb_device *dvbdev = dev_get_drvdata(dev); 912 913 add_uevent_var(env, "DVB_ADAPTER_NUM=%d", dvbdev->adapter->num); 914 add_uevent_var(env, "DVB_DEVICE_TYPE=%s", dnames[dvbdev->type]); 915 add_uevent_var(env, "DVB_DEVICE_NUM=%d", dvbdev->id); 916 return 0; 917 } 918 919 static char *dvb_devnode(struct device *dev, umode_t *mode) 920 { 921 struct dvb_device *dvbdev = dev_get_drvdata(dev); 922 923 return kasprintf(GFP_KERNEL, "dvb/adapter%d/%s%d", 924 dvbdev->adapter->num, dnames[dvbdev->type], dvbdev->id); 925 } 926 927 928 static int __init init_dvbdev(void) 929 { 930 int retval; 931 dev_t dev = MKDEV(DVB_MAJOR, 0); 932 933 if ((retval = register_chrdev_region(dev, MAX_DVB_MINORS, "DVB")) != 0) { 934 pr_err("dvb-core: unable to get major %d\n", DVB_MAJOR); 935 return retval; 936 } 937 938 cdev_init(&dvb_device_cdev, &dvb_device_fops); 939 if ((retval = cdev_add(&dvb_device_cdev, dev, MAX_DVB_MINORS)) != 0) { 940 pr_err("dvb-core: unable register character device\n"); 941 goto error; 942 } 943 944 dvb_class = class_create(THIS_MODULE, "dvb"); 945 if (IS_ERR(dvb_class)) { 946 retval = PTR_ERR(dvb_class); 947 goto error; 948 } 949 dvb_class->dev_uevent = dvb_uevent; 950 dvb_class->devnode = dvb_devnode; 951 return 0; 952 953 error: 954 cdev_del(&dvb_device_cdev); 955 unregister_chrdev_region(dev, MAX_DVB_MINORS); 956 return retval; 957 } 958 959 960 static void __exit exit_dvbdev(void) 961 { 962 class_destroy(dvb_class); 963 cdev_del(&dvb_device_cdev); 964 unregister_chrdev_region(MKDEV(DVB_MAJOR, 0), MAX_DVB_MINORS); 965 } 966 967 subsys_initcall(init_dvbdev); 968 module_exit(exit_dvbdev); 969 970 MODULE_DESCRIPTION("DVB Core Driver"); 971 MODULE_AUTHOR("Marcus Metzler, Ralph Metzler, Holger Waechtler"); 972 MODULE_LICENSE("GPL"); 973