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 dvbdev->adapter->conn = NULL; 245 kfree(dvbdev->adapter->conn_pads); 246 dvbdev->adapter->conn_pads = NULL; 247 } 248 #endif 249 } 250 251 #if defined(CONFIG_MEDIA_CONTROLLER_DVB) 252 static int dvb_create_tsout_entity(struct dvb_device *dvbdev, 253 const char *name, int npads) 254 { 255 int i, ret = 0; 256 257 dvbdev->tsout_pads = kcalloc(npads, sizeof(*dvbdev->tsout_pads), 258 GFP_KERNEL); 259 if (!dvbdev->tsout_pads) 260 return -ENOMEM; 261 262 dvbdev->tsout_entity = kcalloc(npads, sizeof(*dvbdev->tsout_entity), 263 GFP_KERNEL); 264 if (!dvbdev->tsout_entity) 265 return -ENOMEM; 266 267 dvbdev->tsout_num_entities = npads; 268 269 for (i = 0; i < npads; i++) { 270 struct media_pad *pads = &dvbdev->tsout_pads[i]; 271 struct media_entity *entity = &dvbdev->tsout_entity[i]; 272 273 entity->name = kasprintf(GFP_KERNEL, "%s #%d", name, i); 274 if (!entity->name) 275 return -ENOMEM; 276 277 entity->function = MEDIA_ENT_F_IO_DTV; 278 pads->flags = MEDIA_PAD_FL_SINK; 279 280 ret = media_entity_pads_init(entity, 1, pads); 281 if (ret < 0) 282 return ret; 283 284 ret = media_device_register_entity(dvbdev->adapter->mdev, 285 entity); 286 if (ret < 0) 287 return ret; 288 } 289 return 0; 290 } 291 292 #define DEMUX_TSOUT "demux-tsout" 293 #define DVR_TSOUT "dvr-tsout" 294 295 static int dvb_create_media_entity(struct dvb_device *dvbdev, 296 int type, int demux_sink_pads) 297 { 298 int i, ret, npads; 299 300 switch (type) { 301 case DVB_DEVICE_FRONTEND: 302 npads = 2; 303 break; 304 case DVB_DEVICE_DVR: 305 ret = dvb_create_tsout_entity(dvbdev, DVR_TSOUT, 306 demux_sink_pads); 307 return ret; 308 case DVB_DEVICE_DEMUX: 309 npads = 1 + demux_sink_pads; 310 ret = dvb_create_tsout_entity(dvbdev, DEMUX_TSOUT, 311 demux_sink_pads); 312 if (ret < 0) 313 return ret; 314 break; 315 case DVB_DEVICE_CA: 316 npads = 2; 317 break; 318 case DVB_DEVICE_NET: 319 /* 320 * We should be creating entities for the MPE/ULE 321 * decapsulation hardware (or software implementation). 322 * 323 * However, the number of for the MPE/ULE decaps may not be 324 * fixed. As we don't have yet dynamic support for PADs at 325 * the Media Controller, let's not create the decap 326 * entities yet. 327 */ 328 return 0; 329 default: 330 return 0; 331 } 332 333 dvbdev->entity = kzalloc(sizeof(*dvbdev->entity), GFP_KERNEL); 334 if (!dvbdev->entity) 335 return -ENOMEM; 336 337 dvbdev->entity->name = dvbdev->name; 338 339 if (npads) { 340 dvbdev->pads = kcalloc(npads, sizeof(*dvbdev->pads), 341 GFP_KERNEL); 342 if (!dvbdev->pads) 343 return -ENOMEM; 344 } 345 346 switch (type) { 347 case DVB_DEVICE_FRONTEND: 348 dvbdev->entity->function = MEDIA_ENT_F_DTV_DEMOD; 349 dvbdev->pads[0].flags = MEDIA_PAD_FL_SINK; 350 dvbdev->pads[1].flags = MEDIA_PAD_FL_SOURCE; 351 break; 352 case DVB_DEVICE_DEMUX: 353 dvbdev->entity->function = MEDIA_ENT_F_TS_DEMUX; 354 dvbdev->pads[0].flags = MEDIA_PAD_FL_SINK; 355 for (i = 1; i < npads; i++) 356 dvbdev->pads[i].flags = MEDIA_PAD_FL_SOURCE; 357 break; 358 case DVB_DEVICE_CA: 359 dvbdev->entity->function = MEDIA_ENT_F_DTV_CA; 360 dvbdev->pads[0].flags = MEDIA_PAD_FL_SINK; 361 dvbdev->pads[1].flags = MEDIA_PAD_FL_SOURCE; 362 break; 363 default: 364 /* Should never happen, as the first switch prevents it */ 365 kfree(dvbdev->entity); 366 kfree(dvbdev->pads); 367 dvbdev->entity = NULL; 368 dvbdev->pads = NULL; 369 return 0; 370 } 371 372 if (npads) { 373 ret = media_entity_pads_init(dvbdev->entity, npads, dvbdev->pads); 374 if (ret) 375 return ret; 376 } 377 ret = media_device_register_entity(dvbdev->adapter->mdev, 378 dvbdev->entity); 379 if (ret) 380 return ret; 381 382 pr_info("%s: media entity '%s' registered.\n", 383 __func__, dvbdev->entity->name); 384 385 return 0; 386 } 387 #endif 388 389 static int dvb_register_media_device(struct dvb_device *dvbdev, 390 int type, int minor, 391 unsigned demux_sink_pads) 392 { 393 #if defined(CONFIG_MEDIA_CONTROLLER_DVB) 394 struct media_link *link; 395 u32 intf_type; 396 int ret; 397 398 if (!dvbdev->adapter->mdev) 399 return 0; 400 401 ret = dvb_create_media_entity(dvbdev, type, demux_sink_pads); 402 if (ret) 403 return ret; 404 405 switch (type) { 406 case DVB_DEVICE_FRONTEND: 407 intf_type = MEDIA_INTF_T_DVB_FE; 408 break; 409 case DVB_DEVICE_DEMUX: 410 intf_type = MEDIA_INTF_T_DVB_DEMUX; 411 break; 412 case DVB_DEVICE_DVR: 413 intf_type = MEDIA_INTF_T_DVB_DVR; 414 break; 415 case DVB_DEVICE_CA: 416 intf_type = MEDIA_INTF_T_DVB_CA; 417 break; 418 case DVB_DEVICE_NET: 419 intf_type = MEDIA_INTF_T_DVB_NET; 420 break; 421 default: 422 return 0; 423 } 424 425 dvbdev->intf_devnode = media_devnode_create(dvbdev->adapter->mdev, 426 intf_type, 0, 427 DVB_MAJOR, minor); 428 429 if (!dvbdev->intf_devnode) 430 return -ENOMEM; 431 432 /* 433 * Create the "obvious" link, e. g. the ones that represent 434 * a direct association between an interface and an entity. 435 * Other links should be created elsewhere, like: 436 * DVB FE intf -> tuner 437 * DVB demux intf -> dvr 438 */ 439 440 if (!dvbdev->entity) 441 return 0; 442 443 link = media_create_intf_link(dvbdev->entity, &dvbdev->intf_devnode->intf, 444 MEDIA_LNK_FL_ENABLED); 445 if (!link) 446 return -ENOMEM; 447 #endif 448 return 0; 449 } 450 451 int dvb_register_device(struct dvb_adapter *adap, struct dvb_device **pdvbdev, 452 const struct dvb_device *template, void *priv, 453 enum dvb_device_type type, int demux_sink_pads) 454 { 455 struct dvb_device *dvbdev; 456 struct file_operations *dvbdevfops; 457 struct device *clsdev; 458 int minor; 459 int id, ret; 460 461 mutex_lock(&dvbdev_register_lock); 462 463 if ((id = dvbdev_get_free_id (adap, type)) < 0){ 464 mutex_unlock(&dvbdev_register_lock); 465 *pdvbdev = NULL; 466 pr_err("%s: couldn't find free device id\n", __func__); 467 return -ENFILE; 468 } 469 470 *pdvbdev = dvbdev = kzalloc(sizeof(*dvbdev), GFP_KERNEL); 471 472 if (!dvbdev){ 473 mutex_unlock(&dvbdev_register_lock); 474 return -ENOMEM; 475 } 476 477 dvbdevfops = kzalloc(sizeof(struct file_operations), GFP_KERNEL); 478 479 if (!dvbdevfops){ 480 kfree (dvbdev); 481 mutex_unlock(&dvbdev_register_lock); 482 return -ENOMEM; 483 } 484 485 memcpy(dvbdev, template, sizeof(struct dvb_device)); 486 dvbdev->type = type; 487 dvbdev->id = id; 488 dvbdev->adapter = adap; 489 dvbdev->priv = priv; 490 dvbdev->fops = dvbdevfops; 491 init_waitqueue_head (&dvbdev->wait_queue); 492 493 memcpy(dvbdevfops, template->fops, sizeof(struct file_operations)); 494 dvbdevfops->owner = adap->module; 495 496 list_add_tail (&dvbdev->list_head, &adap->device_list); 497 498 down_write(&minor_rwsem); 499 #ifdef CONFIG_DVB_DYNAMIC_MINORS 500 for (minor = 0; minor < MAX_DVB_MINORS; minor++) 501 if (dvb_minors[minor] == NULL) 502 break; 503 504 if (minor == MAX_DVB_MINORS) { 505 kfree(dvbdevfops); 506 kfree(dvbdev); 507 up_write(&minor_rwsem); 508 mutex_unlock(&dvbdev_register_lock); 509 return -EINVAL; 510 } 511 #else 512 minor = nums2minor(adap->num, type, id); 513 #endif 514 515 dvbdev->minor = minor; 516 dvb_minors[minor] = dvbdev; 517 up_write(&minor_rwsem); 518 519 ret = dvb_register_media_device(dvbdev, type, minor, demux_sink_pads); 520 if (ret) { 521 pr_err("%s: dvb_register_media_device failed to create the mediagraph\n", 522 __func__); 523 524 dvb_media_device_free(dvbdev); 525 kfree(dvbdevfops); 526 kfree(dvbdev); 527 up_write(&minor_rwsem); 528 mutex_unlock(&dvbdev_register_lock); 529 return ret; 530 } 531 532 mutex_unlock(&dvbdev_register_lock); 533 534 clsdev = device_create(dvb_class, adap->device, 535 MKDEV(DVB_MAJOR, minor), 536 dvbdev, "dvb%d.%s%d", adap->num, dnames[type], id); 537 if (IS_ERR(clsdev)) { 538 pr_err("%s: failed to create device dvb%d.%s%d (%ld)\n", 539 __func__, adap->num, dnames[type], id, PTR_ERR(clsdev)); 540 return PTR_ERR(clsdev); 541 } 542 dprintk("DVB: register adapter%d/%s%d @ minor: %i (0x%02x)\n", 543 adap->num, dnames[type], id, minor, minor); 544 545 return 0; 546 } 547 EXPORT_SYMBOL(dvb_register_device); 548 549 550 void dvb_remove_device(struct dvb_device *dvbdev) 551 { 552 if (!dvbdev) 553 return; 554 555 down_write(&minor_rwsem); 556 dvb_minors[dvbdev->minor] = NULL; 557 up_write(&minor_rwsem); 558 559 dvb_media_device_free(dvbdev); 560 561 device_destroy(dvb_class, MKDEV(DVB_MAJOR, dvbdev->minor)); 562 563 list_del (&dvbdev->list_head); 564 } 565 EXPORT_SYMBOL(dvb_remove_device); 566 567 568 void dvb_free_device(struct dvb_device *dvbdev) 569 { 570 if (!dvbdev) 571 return; 572 573 kfree (dvbdev->fops); 574 kfree (dvbdev); 575 } 576 EXPORT_SYMBOL(dvb_free_device); 577 578 579 void dvb_unregister_device(struct dvb_device *dvbdev) 580 { 581 dvb_remove_device(dvbdev); 582 dvb_free_device(dvbdev); 583 } 584 EXPORT_SYMBOL(dvb_unregister_device); 585 586 587 #ifdef CONFIG_MEDIA_CONTROLLER_DVB 588 589 static int dvb_create_io_intf_links(struct dvb_adapter *adap, 590 struct media_interface *intf, 591 char *name) 592 { 593 struct media_device *mdev = adap->mdev; 594 struct media_entity *entity; 595 struct media_link *link; 596 597 media_device_for_each_entity(entity, mdev) { 598 if (entity->function == MEDIA_ENT_F_IO_DTV) { 599 if (strncmp(entity->name, name, strlen(name))) 600 continue; 601 link = media_create_intf_link(entity, intf, 602 MEDIA_LNK_FL_ENABLED); 603 if (!link) 604 return -ENOMEM; 605 } 606 } 607 return 0; 608 } 609 610 int dvb_create_media_graph(struct dvb_adapter *adap, 611 bool create_rf_connector) 612 { 613 struct media_device *mdev = adap->mdev; 614 struct media_entity *entity, *tuner = NULL, *demod = NULL, *conn; 615 struct media_entity *demux = NULL, *ca = NULL; 616 struct media_link *link; 617 struct media_interface *intf; 618 unsigned demux_pad = 0; 619 unsigned dvr_pad = 0; 620 unsigned ntuner = 0, ndemod = 0; 621 int ret; 622 static const char *connector_name = "Television"; 623 624 if (!mdev) 625 return 0; 626 627 media_device_for_each_entity(entity, mdev) { 628 switch (entity->function) { 629 case MEDIA_ENT_F_TUNER: 630 tuner = entity; 631 ntuner++; 632 break; 633 case MEDIA_ENT_F_DTV_DEMOD: 634 demod = entity; 635 ndemod++; 636 break; 637 case MEDIA_ENT_F_TS_DEMUX: 638 demux = entity; 639 break; 640 case MEDIA_ENT_F_DTV_CA: 641 ca = entity; 642 break; 643 } 644 } 645 646 /* 647 * Prepare to signalize to media_create_pad_links() that multiple 648 * entities of the same type exists and a 1:n or n:1 links need to be 649 * created. 650 * NOTE: if both tuner and demod have multiple instances, it is up 651 * to the caller driver to create such links. 652 */ 653 if (ntuner > 1) 654 tuner = NULL; 655 if (ndemod > 1) 656 demod = NULL; 657 658 if (create_rf_connector) { 659 conn = kzalloc(sizeof(*conn), GFP_KERNEL); 660 if (!conn) 661 return -ENOMEM; 662 adap->conn = conn; 663 664 adap->conn_pads = kzalloc(sizeof(*adap->conn_pads), GFP_KERNEL); 665 if (!adap->conn_pads) 666 return -ENOMEM; 667 668 conn->flags = MEDIA_ENT_FL_CONNECTOR; 669 conn->function = MEDIA_ENT_F_CONN_RF; 670 conn->name = connector_name; 671 adap->conn_pads->flags = MEDIA_PAD_FL_SOURCE; 672 673 ret = media_entity_pads_init(conn, 1, adap->conn_pads); 674 if (ret) 675 return ret; 676 677 ret = media_device_register_entity(mdev, conn); 678 if (ret) 679 return ret; 680 681 if (!ntuner) 682 ret = media_create_pad_links(mdev, 683 MEDIA_ENT_F_CONN_RF, 684 conn, 0, 685 MEDIA_ENT_F_DTV_DEMOD, 686 demod, 0, 687 MEDIA_LNK_FL_ENABLED, 688 false); 689 else 690 ret = media_create_pad_links(mdev, 691 MEDIA_ENT_F_CONN_RF, 692 conn, 0, 693 MEDIA_ENT_F_TUNER, 694 tuner, TUNER_PAD_RF_INPUT, 695 MEDIA_LNK_FL_ENABLED, 696 false); 697 if (ret) 698 return ret; 699 } 700 701 if (ntuner && ndemod) { 702 ret = media_create_pad_links(mdev, 703 MEDIA_ENT_F_TUNER, 704 tuner, TUNER_PAD_OUTPUT, 705 MEDIA_ENT_F_DTV_DEMOD, 706 demod, 0, MEDIA_LNK_FL_ENABLED, 707 false); 708 if (ret) 709 return ret; 710 } 711 712 if (ndemod && demux) { 713 ret = media_create_pad_links(mdev, 714 MEDIA_ENT_F_DTV_DEMOD, 715 demod, 1, 716 MEDIA_ENT_F_TS_DEMUX, 717 demux, 0, MEDIA_LNK_FL_ENABLED, 718 false); 719 if (ret) 720 return ret; 721 } 722 if (demux && ca) { 723 ret = media_create_pad_link(demux, 1, ca, 724 0, MEDIA_LNK_FL_ENABLED); 725 if (ret) 726 return ret; 727 } 728 729 /* Create demux links for each ringbuffer/pad */ 730 if (demux) { 731 media_device_for_each_entity(entity, mdev) { 732 if (entity->function == MEDIA_ENT_F_IO_DTV) { 733 if (!strncmp(entity->name, DVR_TSOUT, 734 strlen(DVR_TSOUT))) { 735 ret = media_create_pad_link(demux, 736 ++dvr_pad, 737 entity, 0, 0); 738 if (ret) 739 return ret; 740 } 741 if (!strncmp(entity->name, DEMUX_TSOUT, 742 strlen(DEMUX_TSOUT))) { 743 ret = media_create_pad_link(demux, 744 ++demux_pad, 745 entity, 0, 0); 746 if (ret) 747 return ret; 748 } 749 } 750 } 751 } 752 753 /* Create interface links for FE->tuner, DVR->demux and CA->ca */ 754 media_device_for_each_intf(intf, mdev) { 755 if (intf->type == MEDIA_INTF_T_DVB_CA && ca) { 756 link = media_create_intf_link(ca, intf, 757 MEDIA_LNK_FL_ENABLED); 758 if (!link) 759 return -ENOMEM; 760 } 761 762 if (intf->type == MEDIA_INTF_T_DVB_FE && tuner) { 763 link = media_create_intf_link(tuner, intf, 764 MEDIA_LNK_FL_ENABLED); 765 if (!link) 766 return -ENOMEM; 767 } 768 #if 0 769 /* 770 * Indirect link - let's not create yet, as we don't know how 771 * to handle indirect links, nor if this will 772 * actually be needed. 773 */ 774 if (intf->type == MEDIA_INTF_T_DVB_DVR && demux) { 775 link = media_create_intf_link(demux, intf, 776 MEDIA_LNK_FL_ENABLED); 777 if (!link) 778 return -ENOMEM; 779 } 780 #endif 781 if (intf->type == MEDIA_INTF_T_DVB_DVR) { 782 ret = dvb_create_io_intf_links(adap, intf, DVR_TSOUT); 783 if (ret) 784 return ret; 785 } 786 if (intf->type == MEDIA_INTF_T_DVB_DEMUX) { 787 ret = dvb_create_io_intf_links(adap, intf, DEMUX_TSOUT); 788 if (ret) 789 return ret; 790 } 791 } 792 return 0; 793 } 794 EXPORT_SYMBOL_GPL(dvb_create_media_graph); 795 #endif 796 797 static int dvbdev_check_free_adapter_num(int num) 798 { 799 struct list_head *entry; 800 list_for_each(entry, &dvb_adapter_list) { 801 struct dvb_adapter *adap; 802 adap = list_entry(entry, struct dvb_adapter, list_head); 803 if (adap->num == num) 804 return 0; 805 } 806 return 1; 807 } 808 809 static int dvbdev_get_free_adapter_num (void) 810 { 811 int num = 0; 812 813 while (num < DVB_MAX_ADAPTERS) { 814 if (dvbdev_check_free_adapter_num(num)) 815 return num; 816 num++; 817 } 818 819 return -ENFILE; 820 } 821 822 823 int dvb_register_adapter(struct dvb_adapter *adap, const char *name, 824 struct module *module, struct device *device, 825 short *adapter_nums) 826 { 827 int i, num; 828 829 mutex_lock(&dvbdev_register_lock); 830 831 for (i = 0; i < DVB_MAX_ADAPTERS; ++i) { 832 num = adapter_nums[i]; 833 if (num >= 0 && num < DVB_MAX_ADAPTERS) { 834 /* use the one the driver asked for */ 835 if (dvbdev_check_free_adapter_num(num)) 836 break; 837 } else { 838 num = dvbdev_get_free_adapter_num(); 839 break; 840 } 841 num = -1; 842 } 843 844 if (num < 0) { 845 mutex_unlock(&dvbdev_register_lock); 846 return -ENFILE; 847 } 848 849 memset (adap, 0, sizeof(struct dvb_adapter)); 850 INIT_LIST_HEAD (&adap->device_list); 851 852 pr_info("DVB: registering new adapter (%s)\n", name); 853 854 adap->num = num; 855 adap->name = name; 856 adap->module = module; 857 adap->device = device; 858 adap->mfe_shared = 0; 859 adap->mfe_dvbdev = NULL; 860 mutex_init (&adap->mfe_lock); 861 862 list_add_tail (&adap->list_head, &dvb_adapter_list); 863 864 mutex_unlock(&dvbdev_register_lock); 865 866 return num; 867 } 868 EXPORT_SYMBOL(dvb_register_adapter); 869 870 871 int dvb_unregister_adapter(struct dvb_adapter *adap) 872 { 873 mutex_lock(&dvbdev_register_lock); 874 list_del (&adap->list_head); 875 mutex_unlock(&dvbdev_register_lock); 876 return 0; 877 } 878 EXPORT_SYMBOL(dvb_unregister_adapter); 879 880 /* if the miracle happens and "generic_usercopy()" is included into 881 the kernel, then this can vanish. please don't make the mistake and 882 define this as video_usercopy(). this will introduce a dependecy 883 to the v4l "videodev.o" module, which is unnecessary for some 884 cards (ie. the budget dvb-cards don't need the v4l module...) */ 885 int dvb_usercopy(struct file *file, 886 unsigned int cmd, unsigned long arg, 887 int (*func)(struct file *file, 888 unsigned int cmd, void *arg)) 889 { 890 char sbuf[128]; 891 void *mbuf = NULL; 892 void *parg = NULL; 893 int err = -EINVAL; 894 895 /* Copy arguments into temp kernel buffer */ 896 switch (_IOC_DIR(cmd)) { 897 case _IOC_NONE: 898 /* 899 * For this command, the pointer is actually an integer 900 * argument. 901 */ 902 parg = (void *) arg; 903 break; 904 case _IOC_READ: /* some v4l ioctls are marked wrong ... */ 905 case _IOC_WRITE: 906 case (_IOC_WRITE | _IOC_READ): 907 if (_IOC_SIZE(cmd) <= sizeof(sbuf)) { 908 parg = sbuf; 909 } else { 910 /* too big to allocate from stack */ 911 mbuf = kmalloc(_IOC_SIZE(cmd), GFP_KERNEL); 912 if (NULL == mbuf) 913 return -ENOMEM; 914 parg = mbuf; 915 } 916 917 err = -EFAULT; 918 if (copy_from_user(parg, (void __user *)arg, _IOC_SIZE(cmd))) 919 goto out; 920 break; 921 } 922 923 /* call driver */ 924 if ((err = func(file, cmd, parg)) == -ENOIOCTLCMD) 925 err = -ENOTTY; 926 927 if (err < 0) 928 goto out; 929 930 /* Copy results into user buffer */ 931 switch (_IOC_DIR(cmd)) 932 { 933 case _IOC_READ: 934 case (_IOC_WRITE | _IOC_READ): 935 if (copy_to_user((void __user *)arg, parg, _IOC_SIZE(cmd))) 936 err = -EFAULT; 937 break; 938 } 939 940 out: 941 kfree(mbuf); 942 return err; 943 } 944 945 #if IS_ENABLED(CONFIG_I2C) 946 struct i2c_client *dvb_module_probe(const char *module_name, 947 const char *name, 948 struct i2c_adapter *adap, 949 unsigned char addr, 950 void *platform_data) 951 { 952 struct i2c_client *client; 953 struct i2c_board_info *board_info; 954 955 board_info = kzalloc(sizeof(*board_info), GFP_KERNEL); 956 957 if (name) 958 strlcpy(board_info->type, name, I2C_NAME_SIZE); 959 else 960 strlcpy(board_info->type, module_name, I2C_NAME_SIZE); 961 962 board_info->addr = addr; 963 board_info->platform_data = platform_data; 964 request_module(module_name); 965 client = i2c_new_device(adap, board_info); 966 if (client == NULL || client->dev.driver == NULL) { 967 kfree(board_info); 968 return NULL; 969 } 970 971 if (!try_module_get(client->dev.driver->owner)) { 972 i2c_unregister_device(client); 973 client = NULL; 974 } 975 976 kfree(board_info); 977 return client; 978 } 979 EXPORT_SYMBOL_GPL(dvb_module_probe); 980 981 void dvb_module_release(struct i2c_client *client) 982 { 983 if (!client) 984 return; 985 986 module_put(client->dev.driver->owner); 987 i2c_unregister_device(client); 988 } 989 EXPORT_SYMBOL_GPL(dvb_module_release); 990 #endif 991 992 static int dvb_uevent(struct device *dev, struct kobj_uevent_env *env) 993 { 994 struct dvb_device *dvbdev = dev_get_drvdata(dev); 995 996 add_uevent_var(env, "DVB_ADAPTER_NUM=%d", dvbdev->adapter->num); 997 add_uevent_var(env, "DVB_DEVICE_TYPE=%s", dnames[dvbdev->type]); 998 add_uevent_var(env, "DVB_DEVICE_NUM=%d", dvbdev->id); 999 return 0; 1000 } 1001 1002 static char *dvb_devnode(struct device *dev, umode_t *mode) 1003 { 1004 struct dvb_device *dvbdev = dev_get_drvdata(dev); 1005 1006 return kasprintf(GFP_KERNEL, "dvb/adapter%d/%s%d", 1007 dvbdev->adapter->num, dnames[dvbdev->type], dvbdev->id); 1008 } 1009 1010 1011 static int __init init_dvbdev(void) 1012 { 1013 int retval; 1014 dev_t dev = MKDEV(DVB_MAJOR, 0); 1015 1016 if ((retval = register_chrdev_region(dev, MAX_DVB_MINORS, "DVB")) != 0) { 1017 pr_err("dvb-core: unable to get major %d\n", DVB_MAJOR); 1018 return retval; 1019 } 1020 1021 cdev_init(&dvb_device_cdev, &dvb_device_fops); 1022 if ((retval = cdev_add(&dvb_device_cdev, dev, MAX_DVB_MINORS)) != 0) { 1023 pr_err("dvb-core: unable register character device\n"); 1024 goto error; 1025 } 1026 1027 dvb_class = class_create(THIS_MODULE, "dvb"); 1028 if (IS_ERR(dvb_class)) { 1029 retval = PTR_ERR(dvb_class); 1030 goto error; 1031 } 1032 dvb_class->dev_uevent = dvb_uevent; 1033 dvb_class->devnode = dvb_devnode; 1034 return 0; 1035 1036 error: 1037 cdev_del(&dvb_device_cdev); 1038 unregister_chrdev_region(dev, MAX_DVB_MINORS); 1039 return retval; 1040 } 1041 1042 1043 static void __exit exit_dvbdev(void) 1044 { 1045 class_destroy(dvb_class); 1046 cdev_del(&dvb_device_cdev); 1047 unregister_chrdev_region(MKDEV(DVB_MAJOR, 0), MAX_DVB_MINORS); 1048 } 1049 1050 subsys_initcall(init_dvbdev); 1051 module_exit(exit_dvbdev); 1052 1053 MODULE_DESCRIPTION("DVB Core Driver"); 1054 MODULE_AUTHOR("Marcus Metzler, Ralph Metzler, Holger Waechtler"); 1055 MODULE_LICENSE("GPL"); 1056