1 /* 2 * dvbdev.c 3 * 4 * Copyright (C) 2000 Ralph Metzler <ralph@convergence.de> 5 * & Marcus Metzler <marcus@convergence.de> 6 * for convergence integrated media GmbH 7 * 8 * This program is free software; you can redistribute it and/or 9 * modify it under the terms of the GNU Lesser General Public License 10 * as published by the Free Software Foundation; either version 2.1 11 * of the License, or (at your option) any later version. 12 * 13 * This program is distributed in the hope that it will be useful, 14 * but WITHOUT ANY WARRANTY; without even the implied warranty of 15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 16 * GNU General Public License for more details. 17 * 18 */ 19 20 #define pr_fmt(fmt) "dvbdev: " fmt 21 22 #include <linux/types.h> 23 #include <linux/errno.h> 24 #include <linux/string.h> 25 #include <linux/module.h> 26 #include <linux/kernel.h> 27 #include <linux/i2c.h> 28 #include <linux/init.h> 29 #include <linux/slab.h> 30 #include <linux/device.h> 31 #include <linux/fs.h> 32 #include <linux/cdev.h> 33 #include <linux/mutex.h> 34 #include <media/dvbdev.h> 35 36 /* Due to enum tuner_pad_index */ 37 #include <media/tuner.h> 38 39 static DEFINE_MUTEX(dvbdev_mutex); 40 static int dvbdev_debug; 41 42 module_param(dvbdev_debug, int, 0644); 43 MODULE_PARM_DESC(dvbdev_debug, "Turn on/off device debugging (default:off)."); 44 45 #define dprintk(fmt, arg...) do { \ 46 if (dvbdev_debug) \ 47 printk(KERN_DEBUG pr_fmt("%s: " fmt), \ 48 __func__, ##arg); \ 49 } while (0) 50 51 static LIST_HEAD(dvb_adapter_list); 52 static DEFINE_MUTEX(dvbdev_register_lock); 53 54 static const char * const dnames[] = { 55 [DVB_DEVICE_VIDEO] = "video", 56 [DVB_DEVICE_AUDIO] = "audio", 57 [DVB_DEVICE_SEC] = "sec", 58 [DVB_DEVICE_FRONTEND] = "frontend", 59 [DVB_DEVICE_DEMUX] = "demux", 60 [DVB_DEVICE_DVR] = "dvr", 61 [DVB_DEVICE_CA] = "ca", 62 [DVB_DEVICE_NET] = "net", 63 [DVB_DEVICE_OSD] = "osd" 64 }; 65 66 #ifdef CONFIG_DVB_DYNAMIC_MINORS 67 #define MAX_DVB_MINORS 256 68 #define DVB_MAX_IDS MAX_DVB_MINORS 69 #else 70 #define DVB_MAX_IDS 4 71 72 static const u8 minor_type[] = { 73 [DVB_DEVICE_VIDEO] = 0, 74 [DVB_DEVICE_AUDIO] = 1, 75 [DVB_DEVICE_SEC] = 2, 76 [DVB_DEVICE_FRONTEND] = 3, 77 [DVB_DEVICE_DEMUX] = 4, 78 [DVB_DEVICE_DVR] = 5, 79 [DVB_DEVICE_CA] = 6, 80 [DVB_DEVICE_NET] = 7, 81 [DVB_DEVICE_OSD] = 8, 82 }; 83 84 #define nums2minor(num, type, id) \ 85 (((num) << 6) | ((id) << 4) | minor_type[type]) 86 87 #define MAX_DVB_MINORS (DVB_MAX_ADAPTERS*64) 88 #endif 89 90 static struct class *dvb_class; 91 92 static struct dvb_device *dvb_minors[MAX_DVB_MINORS]; 93 static DECLARE_RWSEM(minor_rwsem); 94 95 static int dvb_device_open(struct inode *inode, struct file *file) 96 { 97 struct dvb_device *dvbdev; 98 99 mutex_lock(&dvbdev_mutex); 100 down_read(&minor_rwsem); 101 dvbdev = dvb_minors[iminor(inode)]; 102 103 if (dvbdev && dvbdev->fops) { 104 int err = 0; 105 const struct file_operations *new_fops; 106 107 new_fops = fops_get(dvbdev->fops); 108 if (!new_fops) 109 goto fail; 110 file->private_data = dvbdev; 111 replace_fops(file, new_fops); 112 if (file->f_op->open) 113 err = file->f_op->open(inode, file); 114 up_read(&minor_rwsem); 115 mutex_unlock(&dvbdev_mutex); 116 return err; 117 } 118 fail: 119 up_read(&minor_rwsem); 120 mutex_unlock(&dvbdev_mutex); 121 return -ENODEV; 122 } 123 124 125 static const struct file_operations dvb_device_fops = 126 { 127 .owner = THIS_MODULE, 128 .open = dvb_device_open, 129 .llseek = noop_llseek, 130 }; 131 132 static struct cdev dvb_device_cdev; 133 134 int dvb_generic_open(struct inode *inode, struct file *file) 135 { 136 struct dvb_device *dvbdev = file->private_data; 137 138 if (!dvbdev) 139 return -ENODEV; 140 141 if (!dvbdev->users) 142 return -EBUSY; 143 144 if ((file->f_flags & O_ACCMODE) == O_RDONLY) { 145 if (!dvbdev->readers) 146 return -EBUSY; 147 dvbdev->readers--; 148 } else { 149 if (!dvbdev->writers) 150 return -EBUSY; 151 dvbdev->writers--; 152 } 153 154 dvbdev->users--; 155 return 0; 156 } 157 EXPORT_SYMBOL(dvb_generic_open); 158 159 160 int dvb_generic_release(struct inode *inode, struct file *file) 161 { 162 struct dvb_device *dvbdev = file->private_data; 163 164 if (!dvbdev) 165 return -ENODEV; 166 167 if ((file->f_flags & O_ACCMODE) == O_RDONLY) { 168 dvbdev->readers++; 169 } else { 170 dvbdev->writers++; 171 } 172 173 dvbdev->users++; 174 return 0; 175 } 176 EXPORT_SYMBOL(dvb_generic_release); 177 178 179 long dvb_generic_ioctl(struct file *file, 180 unsigned int cmd, unsigned long arg) 181 { 182 struct dvb_device *dvbdev = file->private_data; 183 184 if (!dvbdev) 185 return -ENODEV; 186 187 if (!dvbdev->kernel_ioctl) 188 return -EINVAL; 189 190 return dvb_usercopy(file, cmd, arg, dvbdev->kernel_ioctl); 191 } 192 EXPORT_SYMBOL(dvb_generic_ioctl); 193 194 195 static int dvbdev_get_free_id (struct dvb_adapter *adap, int type) 196 { 197 u32 id = 0; 198 199 while (id < DVB_MAX_IDS) { 200 struct dvb_device *dev; 201 list_for_each_entry(dev, &adap->device_list, list_head) 202 if (dev->type == type && dev->id == id) 203 goto skip; 204 return id; 205 skip: 206 id++; 207 } 208 return -ENFILE; 209 } 210 211 static void dvb_media_device_free(struct dvb_device *dvbdev) 212 { 213 #if defined(CONFIG_MEDIA_CONTROLLER_DVB) 214 if (dvbdev->entity) { 215 media_device_unregister_entity(dvbdev->entity); 216 kfree(dvbdev->entity); 217 kfree(dvbdev->pads); 218 dvbdev->entity = NULL; 219 dvbdev->pads = NULL; 220 } 221 222 if (dvbdev->tsout_entity) { 223 int i; 224 225 for (i = 0; i < dvbdev->tsout_num_entities; i++) { 226 media_device_unregister_entity(&dvbdev->tsout_entity[i]); 227 kfree(dvbdev->tsout_entity[i].name); 228 } 229 kfree(dvbdev->tsout_entity); 230 kfree(dvbdev->tsout_pads); 231 dvbdev->tsout_entity = NULL; 232 dvbdev->tsout_pads = NULL; 233 234 dvbdev->tsout_num_entities = 0; 235 } 236 237 if (dvbdev->intf_devnode) { 238 media_devnode_remove(dvbdev->intf_devnode); 239 dvbdev->intf_devnode = NULL; 240 } 241 242 if (dvbdev->adapter->conn) { 243 media_device_unregister_entity(dvbdev->adapter->conn); 244 kfree(dvbdev->adapter->conn); 245 dvbdev->adapter->conn = NULL; 246 kfree(dvbdev->adapter->conn_pads); 247 dvbdev->adapter->conn_pads = NULL; 248 } 249 #endif 250 } 251 252 #if defined(CONFIG_MEDIA_CONTROLLER_DVB) 253 static int dvb_create_tsout_entity(struct dvb_device *dvbdev, 254 const char *name, int npads) 255 { 256 int i, ret = 0; 257 258 dvbdev->tsout_pads = kcalloc(npads, sizeof(*dvbdev->tsout_pads), 259 GFP_KERNEL); 260 if (!dvbdev->tsout_pads) 261 return -ENOMEM; 262 263 dvbdev->tsout_entity = kcalloc(npads, sizeof(*dvbdev->tsout_entity), 264 GFP_KERNEL); 265 if (!dvbdev->tsout_entity) 266 return -ENOMEM; 267 268 dvbdev->tsout_num_entities = npads; 269 270 for (i = 0; i < npads; i++) { 271 struct media_pad *pads = &dvbdev->tsout_pads[i]; 272 struct media_entity *entity = &dvbdev->tsout_entity[i]; 273 274 entity->name = kasprintf(GFP_KERNEL, "%s #%d", name, i); 275 if (!entity->name) 276 return -ENOMEM; 277 278 entity->function = MEDIA_ENT_F_IO_DTV; 279 pads->flags = MEDIA_PAD_FL_SINK; 280 281 ret = media_entity_pads_init(entity, 1, pads); 282 if (ret < 0) 283 return ret; 284 285 ret = media_device_register_entity(dvbdev->adapter->mdev, 286 entity); 287 if (ret < 0) 288 return ret; 289 } 290 return 0; 291 } 292 293 #define DEMUX_TSOUT "demux-tsout" 294 #define DVR_TSOUT "dvr-tsout" 295 296 static int dvb_create_media_entity(struct dvb_device *dvbdev, 297 int type, int demux_sink_pads) 298 { 299 int i, ret, npads; 300 301 switch (type) { 302 case DVB_DEVICE_FRONTEND: 303 npads = 2; 304 break; 305 case DVB_DEVICE_DVR: 306 ret = dvb_create_tsout_entity(dvbdev, DVR_TSOUT, 307 demux_sink_pads); 308 return ret; 309 case DVB_DEVICE_DEMUX: 310 npads = 1 + demux_sink_pads; 311 ret = dvb_create_tsout_entity(dvbdev, DEMUX_TSOUT, 312 demux_sink_pads); 313 if (ret < 0) 314 return ret; 315 break; 316 case DVB_DEVICE_CA: 317 npads = 2; 318 break; 319 case DVB_DEVICE_NET: 320 /* 321 * We should be creating entities for the MPE/ULE 322 * decapsulation hardware (or software implementation). 323 * 324 * However, the number of for the MPE/ULE decaps may not be 325 * fixed. As we don't have yet dynamic support for PADs at 326 * the Media Controller, let's not create the decap 327 * entities yet. 328 */ 329 return 0; 330 default: 331 return 0; 332 } 333 334 dvbdev->entity = kzalloc(sizeof(*dvbdev->entity), GFP_KERNEL); 335 if (!dvbdev->entity) 336 return -ENOMEM; 337 338 dvbdev->entity->name = dvbdev->name; 339 340 if (npads) { 341 dvbdev->pads = kcalloc(npads, sizeof(*dvbdev->pads), 342 GFP_KERNEL); 343 if (!dvbdev->pads) { 344 kfree(dvbdev->entity); 345 return -ENOMEM; 346 } 347 } 348 349 switch (type) { 350 case DVB_DEVICE_FRONTEND: 351 dvbdev->entity->function = MEDIA_ENT_F_DTV_DEMOD; 352 dvbdev->pads[0].flags = MEDIA_PAD_FL_SINK; 353 dvbdev->pads[1].flags = MEDIA_PAD_FL_SOURCE; 354 break; 355 case DVB_DEVICE_DEMUX: 356 dvbdev->entity->function = MEDIA_ENT_F_TS_DEMUX; 357 dvbdev->pads[0].flags = MEDIA_PAD_FL_SINK; 358 for (i = 1; i < npads; i++) 359 dvbdev->pads[i].flags = MEDIA_PAD_FL_SOURCE; 360 break; 361 case DVB_DEVICE_CA: 362 dvbdev->entity->function = MEDIA_ENT_F_DTV_CA; 363 dvbdev->pads[0].flags = MEDIA_PAD_FL_SINK; 364 dvbdev->pads[1].flags = MEDIA_PAD_FL_SOURCE; 365 break; 366 default: 367 /* Should never happen, as the first switch prevents it */ 368 kfree(dvbdev->entity); 369 kfree(dvbdev->pads); 370 dvbdev->entity = NULL; 371 dvbdev->pads = NULL; 372 return 0; 373 } 374 375 if (npads) { 376 ret = media_entity_pads_init(dvbdev->entity, npads, dvbdev->pads); 377 if (ret) 378 return ret; 379 } 380 ret = media_device_register_entity(dvbdev->adapter->mdev, 381 dvbdev->entity); 382 if (ret) 383 return ret; 384 385 pr_info("%s: media entity '%s' registered.\n", 386 __func__, dvbdev->entity->name); 387 388 return 0; 389 } 390 #endif 391 392 static int dvb_register_media_device(struct dvb_device *dvbdev, 393 int type, int minor, 394 unsigned demux_sink_pads) 395 { 396 #if defined(CONFIG_MEDIA_CONTROLLER_DVB) 397 struct media_link *link; 398 u32 intf_type; 399 int ret; 400 401 if (!dvbdev->adapter->mdev) 402 return 0; 403 404 ret = dvb_create_media_entity(dvbdev, type, demux_sink_pads); 405 if (ret) 406 return ret; 407 408 switch (type) { 409 case DVB_DEVICE_FRONTEND: 410 intf_type = MEDIA_INTF_T_DVB_FE; 411 break; 412 case DVB_DEVICE_DEMUX: 413 intf_type = MEDIA_INTF_T_DVB_DEMUX; 414 break; 415 case DVB_DEVICE_DVR: 416 intf_type = MEDIA_INTF_T_DVB_DVR; 417 break; 418 case DVB_DEVICE_CA: 419 intf_type = MEDIA_INTF_T_DVB_CA; 420 break; 421 case DVB_DEVICE_NET: 422 intf_type = MEDIA_INTF_T_DVB_NET; 423 break; 424 default: 425 return 0; 426 } 427 428 dvbdev->intf_devnode = media_devnode_create(dvbdev->adapter->mdev, 429 intf_type, 0, 430 DVB_MAJOR, minor); 431 432 if (!dvbdev->intf_devnode) 433 return -ENOMEM; 434 435 /* 436 * Create the "obvious" link, e. g. the ones that represent 437 * a direct association between an interface and an entity. 438 * Other links should be created elsewhere, like: 439 * DVB FE intf -> tuner 440 * DVB demux intf -> dvr 441 */ 442 443 if (!dvbdev->entity) 444 return 0; 445 446 link = media_create_intf_link(dvbdev->entity, 447 &dvbdev->intf_devnode->intf, 448 MEDIA_LNK_FL_ENABLED | 449 MEDIA_LNK_FL_IMMUTABLE); 450 if (!link) 451 return -ENOMEM; 452 #endif 453 return 0; 454 } 455 456 int dvb_register_device(struct dvb_adapter *adap, struct dvb_device **pdvbdev, 457 const struct dvb_device *template, void *priv, 458 enum dvb_device_type type, int demux_sink_pads) 459 { 460 struct dvb_device *dvbdev; 461 struct file_operations *dvbdevfops; 462 struct device *clsdev; 463 int minor; 464 int id, ret; 465 466 mutex_lock(&dvbdev_register_lock); 467 468 if ((id = dvbdev_get_free_id (adap, type)) < 0){ 469 mutex_unlock(&dvbdev_register_lock); 470 *pdvbdev = NULL; 471 pr_err("%s: couldn't find free device id\n", __func__); 472 return -ENFILE; 473 } 474 475 *pdvbdev = dvbdev = kzalloc(sizeof(*dvbdev), GFP_KERNEL); 476 477 if (!dvbdev){ 478 mutex_unlock(&dvbdev_register_lock); 479 return -ENOMEM; 480 } 481 482 dvbdevfops = kmemdup(template->fops, sizeof(*dvbdevfops), GFP_KERNEL); 483 484 if (!dvbdevfops){ 485 kfree (dvbdev); 486 mutex_unlock(&dvbdev_register_lock); 487 return -ENOMEM; 488 } 489 490 memcpy(dvbdev, template, sizeof(struct dvb_device)); 491 dvbdev->type = type; 492 dvbdev->id = id; 493 dvbdev->adapter = adap; 494 dvbdev->priv = priv; 495 dvbdev->fops = dvbdevfops; 496 init_waitqueue_head (&dvbdev->wait_queue); 497 498 dvbdevfops->owner = adap->module; 499 500 list_add_tail (&dvbdev->list_head, &adap->device_list); 501 502 down_write(&minor_rwsem); 503 #ifdef CONFIG_DVB_DYNAMIC_MINORS 504 for (minor = 0; minor < MAX_DVB_MINORS; minor++) 505 if (dvb_minors[minor] == NULL) 506 break; 507 508 if (minor == MAX_DVB_MINORS) { 509 list_del (&dvbdev->list_head); 510 kfree(dvbdevfops); 511 kfree(dvbdev); 512 up_write(&minor_rwsem); 513 mutex_unlock(&dvbdev_register_lock); 514 return -EINVAL; 515 } 516 #else 517 minor = nums2minor(adap->num, type, id); 518 #endif 519 520 dvbdev->minor = minor; 521 dvb_minors[minor] = dvbdev; 522 up_write(&minor_rwsem); 523 524 ret = dvb_register_media_device(dvbdev, type, minor, demux_sink_pads); 525 if (ret) { 526 pr_err("%s: dvb_register_media_device failed to create the mediagraph\n", 527 __func__); 528 529 dvb_media_device_free(dvbdev); 530 list_del (&dvbdev->list_head); 531 kfree(dvbdevfops); 532 kfree(dvbdev); 533 mutex_unlock(&dvbdev_register_lock); 534 return ret; 535 } 536 537 mutex_unlock(&dvbdev_register_lock); 538 539 clsdev = device_create(dvb_class, adap->device, 540 MKDEV(DVB_MAJOR, minor), 541 dvbdev, "dvb%d.%s%d", adap->num, dnames[type], id); 542 if (IS_ERR(clsdev)) { 543 pr_err("%s: failed to create device dvb%d.%s%d (%ld)\n", 544 __func__, adap->num, dnames[type], id, PTR_ERR(clsdev)); 545 dvb_media_device_free(dvbdev); 546 list_del (&dvbdev->list_head); 547 kfree(dvbdevfops); 548 kfree(dvbdev); 549 return PTR_ERR(clsdev); 550 } 551 dprintk("DVB: register adapter%d/%s%d @ minor: %i (0x%02x)\n", 552 adap->num, dnames[type], id, minor, minor); 553 554 return 0; 555 } 556 EXPORT_SYMBOL(dvb_register_device); 557 558 559 void dvb_remove_device(struct dvb_device *dvbdev) 560 { 561 if (!dvbdev) 562 return; 563 564 down_write(&minor_rwsem); 565 dvb_minors[dvbdev->minor] = NULL; 566 up_write(&minor_rwsem); 567 568 dvb_media_device_free(dvbdev); 569 570 device_destroy(dvb_class, MKDEV(DVB_MAJOR, dvbdev->minor)); 571 572 list_del (&dvbdev->list_head); 573 } 574 EXPORT_SYMBOL(dvb_remove_device); 575 576 577 void dvb_free_device(struct dvb_device *dvbdev) 578 { 579 if (!dvbdev) 580 return; 581 582 kfree (dvbdev->fops); 583 kfree (dvbdev); 584 } 585 EXPORT_SYMBOL(dvb_free_device); 586 587 588 void dvb_unregister_device(struct dvb_device *dvbdev) 589 { 590 dvb_remove_device(dvbdev); 591 dvb_free_device(dvbdev); 592 } 593 EXPORT_SYMBOL(dvb_unregister_device); 594 595 596 #ifdef CONFIG_MEDIA_CONTROLLER_DVB 597 598 static int dvb_create_io_intf_links(struct dvb_adapter *adap, 599 struct media_interface *intf, 600 char *name) 601 { 602 struct media_device *mdev = adap->mdev; 603 struct media_entity *entity; 604 struct media_link *link; 605 606 media_device_for_each_entity(entity, mdev) { 607 if (entity->function == MEDIA_ENT_F_IO_DTV) { 608 if (strncmp(entity->name, name, strlen(name))) 609 continue; 610 link = media_create_intf_link(entity, intf, 611 MEDIA_LNK_FL_ENABLED | 612 MEDIA_LNK_FL_IMMUTABLE); 613 if (!link) 614 return -ENOMEM; 615 } 616 } 617 return 0; 618 } 619 620 int dvb_create_media_graph(struct dvb_adapter *adap, 621 bool create_rf_connector) 622 { 623 struct media_device *mdev = adap->mdev; 624 struct media_entity *entity, *tuner = NULL, *demod = NULL, *conn; 625 struct media_entity *demux = NULL, *ca = NULL; 626 struct media_link *link; 627 struct media_interface *intf; 628 unsigned demux_pad = 0; 629 unsigned dvr_pad = 0; 630 unsigned ntuner = 0, ndemod = 0; 631 int ret, pad_source, pad_sink; 632 static const char *connector_name = "Television"; 633 634 if (!mdev) 635 return 0; 636 637 media_device_for_each_entity(entity, mdev) { 638 switch (entity->function) { 639 case MEDIA_ENT_F_TUNER: 640 tuner = entity; 641 ntuner++; 642 break; 643 case MEDIA_ENT_F_DTV_DEMOD: 644 demod = entity; 645 ndemod++; 646 break; 647 case MEDIA_ENT_F_TS_DEMUX: 648 demux = entity; 649 break; 650 case MEDIA_ENT_F_DTV_CA: 651 ca = entity; 652 break; 653 } 654 } 655 656 /* 657 * Prepare to signalize to media_create_pad_links() that multiple 658 * entities of the same type exists and a 1:n or n:1 links need to be 659 * created. 660 * NOTE: if both tuner and demod have multiple instances, it is up 661 * to the caller driver to create such links. 662 */ 663 if (ntuner > 1) 664 tuner = NULL; 665 if (ndemod > 1) 666 demod = NULL; 667 668 if (create_rf_connector) { 669 conn = kzalloc(sizeof(*conn), GFP_KERNEL); 670 if (!conn) 671 return -ENOMEM; 672 adap->conn = conn; 673 674 adap->conn_pads = kzalloc(sizeof(*adap->conn_pads), GFP_KERNEL); 675 if (!adap->conn_pads) 676 return -ENOMEM; 677 678 conn->flags = MEDIA_ENT_FL_CONNECTOR; 679 conn->function = MEDIA_ENT_F_CONN_RF; 680 conn->name = connector_name; 681 adap->conn_pads->flags = MEDIA_PAD_FL_SOURCE; 682 683 ret = media_entity_pads_init(conn, 1, adap->conn_pads); 684 if (ret) 685 return ret; 686 687 ret = media_device_register_entity(mdev, conn); 688 if (ret) 689 return ret; 690 691 if (!ntuner) { 692 ret = media_create_pad_links(mdev, 693 MEDIA_ENT_F_CONN_RF, 694 conn, 0, 695 MEDIA_ENT_F_DTV_DEMOD, 696 demod, 0, 697 MEDIA_LNK_FL_ENABLED, 698 false); 699 } else { 700 pad_sink = media_get_pad_index(tuner, true, 701 PAD_SIGNAL_ANALOG); 702 if (pad_sink < 0) 703 return -EINVAL; 704 ret = media_create_pad_links(mdev, 705 MEDIA_ENT_F_CONN_RF, 706 conn, 0, 707 MEDIA_ENT_F_TUNER, 708 tuner, pad_sink, 709 MEDIA_LNK_FL_ENABLED, 710 false); 711 } 712 if (ret) 713 return ret; 714 } 715 716 if (ntuner && ndemod) { 717 /* NOTE: first found tuner source pad presumed correct */ 718 pad_source = media_get_pad_index(tuner, false, 719 PAD_SIGNAL_ANALOG); 720 if (pad_source < 0) 721 return -EINVAL; 722 ret = media_create_pad_links(mdev, 723 MEDIA_ENT_F_TUNER, 724 tuner, pad_source, 725 MEDIA_ENT_F_DTV_DEMOD, 726 demod, 0, MEDIA_LNK_FL_ENABLED, 727 false); 728 if (ret) 729 return ret; 730 } 731 732 if (ndemod && demux) { 733 ret = media_create_pad_links(mdev, 734 MEDIA_ENT_F_DTV_DEMOD, 735 demod, 1, 736 MEDIA_ENT_F_TS_DEMUX, 737 demux, 0, MEDIA_LNK_FL_ENABLED, 738 false); 739 if (ret) 740 return ret; 741 } 742 if (demux && ca) { 743 ret = media_create_pad_link(demux, 1, ca, 744 0, MEDIA_LNK_FL_ENABLED); 745 if (ret) 746 return ret; 747 } 748 749 /* Create demux links for each ringbuffer/pad */ 750 if (demux) { 751 media_device_for_each_entity(entity, mdev) { 752 if (entity->function == MEDIA_ENT_F_IO_DTV) { 753 if (!strncmp(entity->name, DVR_TSOUT, 754 strlen(DVR_TSOUT))) { 755 ret = media_create_pad_link(demux, 756 ++dvr_pad, 757 entity, 0, 0); 758 if (ret) 759 return ret; 760 } 761 if (!strncmp(entity->name, DEMUX_TSOUT, 762 strlen(DEMUX_TSOUT))) { 763 ret = media_create_pad_link(demux, 764 ++demux_pad, 765 entity, 0, 0); 766 if (ret) 767 return ret; 768 } 769 } 770 } 771 } 772 773 /* Create interface links for FE->tuner, DVR->demux and CA->ca */ 774 media_device_for_each_intf(intf, mdev) { 775 if (intf->type == MEDIA_INTF_T_DVB_CA && ca) { 776 link = media_create_intf_link(ca, intf, 777 MEDIA_LNK_FL_ENABLED | 778 MEDIA_LNK_FL_IMMUTABLE); 779 if (!link) 780 return -ENOMEM; 781 } 782 783 if (intf->type == MEDIA_INTF_T_DVB_FE && tuner) { 784 link = media_create_intf_link(tuner, intf, 785 MEDIA_LNK_FL_ENABLED | 786 MEDIA_LNK_FL_IMMUTABLE); 787 if (!link) 788 return -ENOMEM; 789 } 790 #if 0 791 /* 792 * Indirect link - let's not create yet, as we don't know how 793 * to handle indirect links, nor if this will 794 * actually be needed. 795 */ 796 if (intf->type == MEDIA_INTF_T_DVB_DVR && demux) { 797 link = media_create_intf_link(demux, intf, 798 MEDIA_LNK_FL_ENABLED | 799 MEDIA_LNK_FL_IMMUTABLE); 800 if (!link) 801 return -ENOMEM; 802 } 803 #endif 804 if (intf->type == MEDIA_INTF_T_DVB_DVR) { 805 ret = dvb_create_io_intf_links(adap, intf, DVR_TSOUT); 806 if (ret) 807 return ret; 808 } 809 if (intf->type == MEDIA_INTF_T_DVB_DEMUX) { 810 ret = dvb_create_io_intf_links(adap, intf, DEMUX_TSOUT); 811 if (ret) 812 return ret; 813 } 814 } 815 return 0; 816 } 817 EXPORT_SYMBOL_GPL(dvb_create_media_graph); 818 #endif 819 820 static int dvbdev_check_free_adapter_num(int num) 821 { 822 struct list_head *entry; 823 list_for_each(entry, &dvb_adapter_list) { 824 struct dvb_adapter *adap; 825 adap = list_entry(entry, struct dvb_adapter, list_head); 826 if (adap->num == num) 827 return 0; 828 } 829 return 1; 830 } 831 832 static int dvbdev_get_free_adapter_num (void) 833 { 834 int num = 0; 835 836 while (num < DVB_MAX_ADAPTERS) { 837 if (dvbdev_check_free_adapter_num(num)) 838 return num; 839 num++; 840 } 841 842 return -ENFILE; 843 } 844 845 846 int dvb_register_adapter(struct dvb_adapter *adap, const char *name, 847 struct module *module, struct device *device, 848 short *adapter_nums) 849 { 850 int i, num; 851 852 mutex_lock(&dvbdev_register_lock); 853 854 for (i = 0; i < DVB_MAX_ADAPTERS; ++i) { 855 num = adapter_nums[i]; 856 if (num >= 0 && num < DVB_MAX_ADAPTERS) { 857 /* use the one the driver asked for */ 858 if (dvbdev_check_free_adapter_num(num)) 859 break; 860 } else { 861 num = dvbdev_get_free_adapter_num(); 862 break; 863 } 864 num = -1; 865 } 866 867 if (num < 0) { 868 mutex_unlock(&dvbdev_register_lock); 869 return -ENFILE; 870 } 871 872 memset (adap, 0, sizeof(struct dvb_adapter)); 873 INIT_LIST_HEAD (&adap->device_list); 874 875 pr_info("DVB: registering new adapter (%s)\n", name); 876 877 adap->num = num; 878 adap->name = name; 879 adap->module = module; 880 adap->device = device; 881 adap->mfe_shared = 0; 882 adap->mfe_dvbdev = NULL; 883 mutex_init (&adap->mfe_lock); 884 885 #ifdef CONFIG_MEDIA_CONTROLLER_DVB 886 mutex_init(&adap->mdev_lock); 887 #endif 888 889 list_add_tail (&adap->list_head, &dvb_adapter_list); 890 891 mutex_unlock(&dvbdev_register_lock); 892 893 return num; 894 } 895 EXPORT_SYMBOL(dvb_register_adapter); 896 897 898 int dvb_unregister_adapter(struct dvb_adapter *adap) 899 { 900 mutex_lock(&dvbdev_register_lock); 901 list_del (&adap->list_head); 902 mutex_unlock(&dvbdev_register_lock); 903 return 0; 904 } 905 EXPORT_SYMBOL(dvb_unregister_adapter); 906 907 /* if the miracle happens and "generic_usercopy()" is included into 908 the kernel, then this can vanish. please don't make the mistake and 909 define this as video_usercopy(). this will introduce a dependency 910 to the v4l "videodev.o" module, which is unnecessary for some 911 cards (ie. the budget dvb-cards don't need the v4l module...) */ 912 int dvb_usercopy(struct file *file, 913 unsigned int cmd, unsigned long arg, 914 int (*func)(struct file *file, 915 unsigned int cmd, void *arg)) 916 { 917 char sbuf[128]; 918 void *mbuf = NULL; 919 void *parg = NULL; 920 int err = -EINVAL; 921 922 /* Copy arguments into temp kernel buffer */ 923 switch (_IOC_DIR(cmd)) { 924 case _IOC_NONE: 925 /* 926 * For this command, the pointer is actually an integer 927 * argument. 928 */ 929 parg = (void *) arg; 930 break; 931 case _IOC_READ: /* some v4l ioctls are marked wrong ... */ 932 case _IOC_WRITE: 933 case (_IOC_WRITE | _IOC_READ): 934 if (_IOC_SIZE(cmd) <= sizeof(sbuf)) { 935 parg = sbuf; 936 } else { 937 /* too big to allocate from stack */ 938 mbuf = kmalloc(_IOC_SIZE(cmd), GFP_KERNEL); 939 if (NULL == mbuf) 940 return -ENOMEM; 941 parg = mbuf; 942 } 943 944 err = -EFAULT; 945 if (copy_from_user(parg, (void __user *)arg, _IOC_SIZE(cmd))) 946 goto out; 947 break; 948 } 949 950 /* call driver */ 951 if ((err = func(file, cmd, parg)) == -ENOIOCTLCMD) 952 err = -ENOTTY; 953 954 if (err < 0) 955 goto out; 956 957 /* Copy results into user buffer */ 958 switch (_IOC_DIR(cmd)) 959 { 960 case _IOC_READ: 961 case (_IOC_WRITE | _IOC_READ): 962 if (copy_to_user((void __user *)arg, parg, _IOC_SIZE(cmd))) 963 err = -EFAULT; 964 break; 965 } 966 967 out: 968 kfree(mbuf); 969 return err; 970 } 971 972 #if IS_ENABLED(CONFIG_I2C) 973 struct i2c_client *dvb_module_probe(const char *module_name, 974 const char *name, 975 struct i2c_adapter *adap, 976 unsigned char addr, 977 void *platform_data) 978 { 979 struct i2c_client *client; 980 struct i2c_board_info *board_info; 981 982 board_info = kzalloc(sizeof(*board_info), GFP_KERNEL); 983 if (!board_info) 984 return NULL; 985 986 if (name) 987 strscpy(board_info->type, name, I2C_NAME_SIZE); 988 else 989 strscpy(board_info->type, module_name, I2C_NAME_SIZE); 990 991 board_info->addr = addr; 992 board_info->platform_data = platform_data; 993 request_module(module_name); 994 client = i2c_new_client_device(adap, board_info); 995 if (!i2c_client_has_driver(client)) { 996 kfree(board_info); 997 return NULL; 998 } 999 1000 if (!try_module_get(client->dev.driver->owner)) { 1001 i2c_unregister_device(client); 1002 client = NULL; 1003 } 1004 1005 kfree(board_info); 1006 return client; 1007 } 1008 EXPORT_SYMBOL_GPL(dvb_module_probe); 1009 1010 void dvb_module_release(struct i2c_client *client) 1011 { 1012 if (!client) 1013 return; 1014 1015 module_put(client->dev.driver->owner); 1016 i2c_unregister_device(client); 1017 } 1018 EXPORT_SYMBOL_GPL(dvb_module_release); 1019 #endif 1020 1021 static int dvb_uevent(struct device *dev, struct kobj_uevent_env *env) 1022 { 1023 struct dvb_device *dvbdev = dev_get_drvdata(dev); 1024 1025 add_uevent_var(env, "DVB_ADAPTER_NUM=%d", dvbdev->adapter->num); 1026 add_uevent_var(env, "DVB_DEVICE_TYPE=%s", dnames[dvbdev->type]); 1027 add_uevent_var(env, "DVB_DEVICE_NUM=%d", dvbdev->id); 1028 return 0; 1029 } 1030 1031 static char *dvb_devnode(struct device *dev, umode_t *mode) 1032 { 1033 struct dvb_device *dvbdev = dev_get_drvdata(dev); 1034 1035 return kasprintf(GFP_KERNEL, "dvb/adapter%d/%s%d", 1036 dvbdev->adapter->num, dnames[dvbdev->type], dvbdev->id); 1037 } 1038 1039 1040 static int __init init_dvbdev(void) 1041 { 1042 int retval; 1043 dev_t dev = MKDEV(DVB_MAJOR, 0); 1044 1045 if ((retval = register_chrdev_region(dev, MAX_DVB_MINORS, "DVB")) != 0) { 1046 pr_err("dvb-core: unable to get major %d\n", DVB_MAJOR); 1047 return retval; 1048 } 1049 1050 cdev_init(&dvb_device_cdev, &dvb_device_fops); 1051 if ((retval = cdev_add(&dvb_device_cdev, dev, MAX_DVB_MINORS)) != 0) { 1052 pr_err("dvb-core: unable register character device\n"); 1053 goto error; 1054 } 1055 1056 dvb_class = class_create(THIS_MODULE, "dvb"); 1057 if (IS_ERR(dvb_class)) { 1058 retval = PTR_ERR(dvb_class); 1059 goto error; 1060 } 1061 dvb_class->dev_uevent = dvb_uevent; 1062 dvb_class->devnode = dvb_devnode; 1063 return 0; 1064 1065 error: 1066 cdev_del(&dvb_device_cdev); 1067 unregister_chrdev_region(dev, MAX_DVB_MINORS); 1068 return retval; 1069 } 1070 1071 1072 static void __exit exit_dvbdev(void) 1073 { 1074 class_destroy(dvb_class); 1075 cdev_del(&dvb_device_cdev); 1076 unregister_chrdev_region(MKDEV(DVB_MAJOR, 0), MAX_DVB_MINORS); 1077 } 1078 1079 subsys_initcall(init_dvbdev); 1080 module_exit(exit_dvbdev); 1081 1082 MODULE_DESCRIPTION("DVB Core Driver"); 1083 MODULE_AUTHOR("Marcus Metzler, Ralph Metzler, Holger Waechtler"); 1084 MODULE_LICENSE("GPL"); 1085