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 kfree(dvbdev->entity); 344 return -ENOMEM; 345 } 346 } 347 348 switch (type) { 349 case DVB_DEVICE_FRONTEND: 350 dvbdev->entity->function = MEDIA_ENT_F_DTV_DEMOD; 351 dvbdev->pads[0].flags = MEDIA_PAD_FL_SINK; 352 dvbdev->pads[1].flags = MEDIA_PAD_FL_SOURCE; 353 break; 354 case DVB_DEVICE_DEMUX: 355 dvbdev->entity->function = MEDIA_ENT_F_TS_DEMUX; 356 dvbdev->pads[0].flags = MEDIA_PAD_FL_SINK; 357 for (i = 1; i < npads; i++) 358 dvbdev->pads[i].flags = MEDIA_PAD_FL_SOURCE; 359 break; 360 case DVB_DEVICE_CA: 361 dvbdev->entity->function = MEDIA_ENT_F_DTV_CA; 362 dvbdev->pads[0].flags = MEDIA_PAD_FL_SINK; 363 dvbdev->pads[1].flags = MEDIA_PAD_FL_SOURCE; 364 break; 365 default: 366 /* Should never happen, as the first switch prevents it */ 367 kfree(dvbdev->entity); 368 kfree(dvbdev->pads); 369 dvbdev->entity = NULL; 370 dvbdev->pads = NULL; 371 return 0; 372 } 373 374 if (npads) { 375 ret = media_entity_pads_init(dvbdev->entity, npads, dvbdev->pads); 376 if (ret) 377 return ret; 378 } 379 ret = media_device_register_entity(dvbdev->adapter->mdev, 380 dvbdev->entity); 381 if (ret) 382 return ret; 383 384 pr_info("%s: media entity '%s' registered.\n", 385 __func__, dvbdev->entity->name); 386 387 return 0; 388 } 389 #endif 390 391 static int dvb_register_media_device(struct dvb_device *dvbdev, 392 int type, int minor, 393 unsigned demux_sink_pads) 394 { 395 #if defined(CONFIG_MEDIA_CONTROLLER_DVB) 396 struct media_link *link; 397 u32 intf_type; 398 int ret; 399 400 if (!dvbdev->adapter->mdev) 401 return 0; 402 403 ret = dvb_create_media_entity(dvbdev, type, demux_sink_pads); 404 if (ret) 405 return ret; 406 407 switch (type) { 408 case DVB_DEVICE_FRONTEND: 409 intf_type = MEDIA_INTF_T_DVB_FE; 410 break; 411 case DVB_DEVICE_DEMUX: 412 intf_type = MEDIA_INTF_T_DVB_DEMUX; 413 break; 414 case DVB_DEVICE_DVR: 415 intf_type = MEDIA_INTF_T_DVB_DVR; 416 break; 417 case DVB_DEVICE_CA: 418 intf_type = MEDIA_INTF_T_DVB_CA; 419 break; 420 case DVB_DEVICE_NET: 421 intf_type = MEDIA_INTF_T_DVB_NET; 422 break; 423 default: 424 return 0; 425 } 426 427 dvbdev->intf_devnode = media_devnode_create(dvbdev->adapter->mdev, 428 intf_type, 0, 429 DVB_MAJOR, minor); 430 431 if (!dvbdev->intf_devnode) 432 return -ENOMEM; 433 434 /* 435 * Create the "obvious" link, e. g. the ones that represent 436 * a direct association between an interface and an entity. 437 * Other links should be created elsewhere, like: 438 * DVB FE intf -> tuner 439 * DVB demux intf -> dvr 440 */ 441 442 if (!dvbdev->entity) 443 return 0; 444 445 link = media_create_intf_link(dvbdev->entity, 446 &dvbdev->intf_devnode->intf, 447 MEDIA_LNK_FL_ENABLED | 448 MEDIA_LNK_FL_IMMUTABLE); 449 if (!link) 450 return -ENOMEM; 451 #endif 452 return 0; 453 } 454 455 int dvb_register_device(struct dvb_adapter *adap, struct dvb_device **pdvbdev, 456 const struct dvb_device *template, void *priv, 457 enum dvb_device_type type, int demux_sink_pads) 458 { 459 struct dvb_device *dvbdev; 460 struct file_operations *dvbdevfops; 461 struct device *clsdev; 462 int minor; 463 int id, ret; 464 465 mutex_lock(&dvbdev_register_lock); 466 467 if ((id = dvbdev_get_free_id (adap, type)) < 0){ 468 mutex_unlock(&dvbdev_register_lock); 469 *pdvbdev = NULL; 470 pr_err("%s: couldn't find free device id\n", __func__); 471 return -ENFILE; 472 } 473 474 *pdvbdev = dvbdev = kzalloc(sizeof(*dvbdev), GFP_KERNEL); 475 476 if (!dvbdev){ 477 mutex_unlock(&dvbdev_register_lock); 478 return -ENOMEM; 479 } 480 481 dvbdevfops = kmemdup(template->fops, sizeof(*dvbdevfops), GFP_KERNEL); 482 483 if (!dvbdevfops){ 484 kfree (dvbdev); 485 mutex_unlock(&dvbdev_register_lock); 486 return -ENOMEM; 487 } 488 489 memcpy(dvbdev, template, sizeof(struct dvb_device)); 490 dvbdev->type = type; 491 dvbdev->id = id; 492 dvbdev->adapter = adap; 493 dvbdev->priv = priv; 494 dvbdev->fops = dvbdevfops; 495 init_waitqueue_head (&dvbdev->wait_queue); 496 497 dvbdevfops->owner = adap->module; 498 499 list_add_tail (&dvbdev->list_head, &adap->device_list); 500 501 down_write(&minor_rwsem); 502 #ifdef CONFIG_DVB_DYNAMIC_MINORS 503 for (minor = 0; minor < MAX_DVB_MINORS; minor++) 504 if (dvb_minors[minor] == NULL) 505 break; 506 507 if (minor == MAX_DVB_MINORS) { 508 kfree(dvbdevfops); 509 kfree(dvbdev); 510 up_write(&minor_rwsem); 511 mutex_unlock(&dvbdev_register_lock); 512 return -EINVAL; 513 } 514 #else 515 minor = nums2minor(adap->num, type, id); 516 #endif 517 518 dvbdev->minor = minor; 519 dvb_minors[minor] = dvbdev; 520 up_write(&minor_rwsem); 521 522 ret = dvb_register_media_device(dvbdev, type, minor, demux_sink_pads); 523 if (ret) { 524 pr_err("%s: dvb_register_media_device failed to create the mediagraph\n", 525 __func__); 526 527 dvb_media_device_free(dvbdev); 528 kfree(dvbdevfops); 529 kfree(dvbdev); 530 mutex_unlock(&dvbdev_register_lock); 531 return ret; 532 } 533 534 mutex_unlock(&dvbdev_register_lock); 535 536 clsdev = device_create(dvb_class, adap->device, 537 MKDEV(DVB_MAJOR, minor), 538 dvbdev, "dvb%d.%s%d", adap->num, dnames[type], id); 539 if (IS_ERR(clsdev)) { 540 pr_err("%s: failed to create device dvb%d.%s%d (%ld)\n", 541 __func__, adap->num, dnames[type], id, PTR_ERR(clsdev)); 542 return PTR_ERR(clsdev); 543 } 544 dprintk("DVB: register adapter%d/%s%d @ minor: %i (0x%02x)\n", 545 adap->num, dnames[type], id, minor, minor); 546 547 return 0; 548 } 549 EXPORT_SYMBOL(dvb_register_device); 550 551 552 void dvb_remove_device(struct dvb_device *dvbdev) 553 { 554 if (!dvbdev) 555 return; 556 557 down_write(&minor_rwsem); 558 dvb_minors[dvbdev->minor] = NULL; 559 up_write(&minor_rwsem); 560 561 dvb_media_device_free(dvbdev); 562 563 device_destroy(dvb_class, MKDEV(DVB_MAJOR, dvbdev->minor)); 564 565 list_del (&dvbdev->list_head); 566 } 567 EXPORT_SYMBOL(dvb_remove_device); 568 569 570 void dvb_free_device(struct dvb_device *dvbdev) 571 { 572 if (!dvbdev) 573 return; 574 575 kfree (dvbdev->fops); 576 kfree (dvbdev); 577 } 578 EXPORT_SYMBOL(dvb_free_device); 579 580 581 void dvb_unregister_device(struct dvb_device *dvbdev) 582 { 583 dvb_remove_device(dvbdev); 584 dvb_free_device(dvbdev); 585 } 586 EXPORT_SYMBOL(dvb_unregister_device); 587 588 589 #ifdef CONFIG_MEDIA_CONTROLLER_DVB 590 591 static int dvb_create_io_intf_links(struct dvb_adapter *adap, 592 struct media_interface *intf, 593 char *name) 594 { 595 struct media_device *mdev = adap->mdev; 596 struct media_entity *entity; 597 struct media_link *link; 598 599 media_device_for_each_entity(entity, mdev) { 600 if (entity->function == MEDIA_ENT_F_IO_DTV) { 601 if (strncmp(entity->name, name, strlen(name))) 602 continue; 603 link = media_create_intf_link(entity, intf, 604 MEDIA_LNK_FL_ENABLED | 605 MEDIA_LNK_FL_IMMUTABLE); 606 if (!link) 607 return -ENOMEM; 608 } 609 } 610 return 0; 611 } 612 613 int dvb_create_media_graph(struct dvb_adapter *adap, 614 bool create_rf_connector) 615 { 616 struct media_device *mdev = adap->mdev; 617 struct media_entity *entity, *tuner = NULL, *demod = NULL, *conn; 618 struct media_entity *demux = NULL, *ca = NULL; 619 struct media_link *link; 620 struct media_interface *intf; 621 unsigned demux_pad = 0; 622 unsigned dvr_pad = 0; 623 unsigned ntuner = 0, ndemod = 0; 624 int ret, pad_source, pad_sink; 625 static const char *connector_name = "Television"; 626 627 if (!mdev) 628 return 0; 629 630 media_device_for_each_entity(entity, mdev) { 631 switch (entity->function) { 632 case MEDIA_ENT_F_TUNER: 633 tuner = entity; 634 ntuner++; 635 break; 636 case MEDIA_ENT_F_DTV_DEMOD: 637 demod = entity; 638 ndemod++; 639 break; 640 case MEDIA_ENT_F_TS_DEMUX: 641 demux = entity; 642 break; 643 case MEDIA_ENT_F_DTV_CA: 644 ca = entity; 645 break; 646 } 647 } 648 649 /* 650 * Prepare to signalize to media_create_pad_links() that multiple 651 * entities of the same type exists and a 1:n or n:1 links need to be 652 * created. 653 * NOTE: if both tuner and demod have multiple instances, it is up 654 * to the caller driver to create such links. 655 */ 656 if (ntuner > 1) 657 tuner = NULL; 658 if (ndemod > 1) 659 demod = NULL; 660 661 if (create_rf_connector) { 662 conn = kzalloc(sizeof(*conn), GFP_KERNEL); 663 if (!conn) 664 return -ENOMEM; 665 adap->conn = conn; 666 667 adap->conn_pads = kzalloc(sizeof(*adap->conn_pads), GFP_KERNEL); 668 if (!adap->conn_pads) 669 return -ENOMEM; 670 671 conn->flags = MEDIA_ENT_FL_CONNECTOR; 672 conn->function = MEDIA_ENT_F_CONN_RF; 673 conn->name = connector_name; 674 adap->conn_pads->flags = MEDIA_PAD_FL_SOURCE; 675 676 ret = media_entity_pads_init(conn, 1, adap->conn_pads); 677 if (ret) 678 return ret; 679 680 ret = media_device_register_entity(mdev, conn); 681 if (ret) 682 return ret; 683 684 if (!ntuner) { 685 ret = media_create_pad_links(mdev, 686 MEDIA_ENT_F_CONN_RF, 687 conn, 0, 688 MEDIA_ENT_F_DTV_DEMOD, 689 demod, 0, 690 MEDIA_LNK_FL_ENABLED, 691 false); 692 } else { 693 pad_sink = media_get_pad_index(tuner, true, 694 PAD_SIGNAL_ANALOG); 695 if (pad_sink < 0) 696 return -EINVAL; 697 ret = media_create_pad_links(mdev, 698 MEDIA_ENT_F_CONN_RF, 699 conn, 0, 700 MEDIA_ENT_F_TUNER, 701 tuner, pad_sink, 702 MEDIA_LNK_FL_ENABLED, 703 false); 704 } 705 if (ret) 706 return ret; 707 } 708 709 if (ntuner && ndemod) { 710 pad_source = media_get_pad_index(tuner, true, 711 PAD_SIGNAL_ANALOG); 712 if (pad_source) 713 return -EINVAL; 714 ret = media_create_pad_links(mdev, 715 MEDIA_ENT_F_TUNER, 716 tuner, pad_source, 717 MEDIA_ENT_F_DTV_DEMOD, 718 demod, 0, MEDIA_LNK_FL_ENABLED, 719 false); 720 if (ret) 721 return ret; 722 } 723 724 if (ndemod && demux) { 725 ret = media_create_pad_links(mdev, 726 MEDIA_ENT_F_DTV_DEMOD, 727 demod, 1, 728 MEDIA_ENT_F_TS_DEMUX, 729 demux, 0, MEDIA_LNK_FL_ENABLED, 730 false); 731 if (ret) 732 return ret; 733 } 734 if (demux && ca) { 735 ret = media_create_pad_link(demux, 1, ca, 736 0, MEDIA_LNK_FL_ENABLED); 737 if (ret) 738 return ret; 739 } 740 741 /* Create demux links for each ringbuffer/pad */ 742 if (demux) { 743 media_device_for_each_entity(entity, mdev) { 744 if (entity->function == MEDIA_ENT_F_IO_DTV) { 745 if (!strncmp(entity->name, DVR_TSOUT, 746 strlen(DVR_TSOUT))) { 747 ret = media_create_pad_link(demux, 748 ++dvr_pad, 749 entity, 0, 0); 750 if (ret) 751 return ret; 752 } 753 if (!strncmp(entity->name, DEMUX_TSOUT, 754 strlen(DEMUX_TSOUT))) { 755 ret = media_create_pad_link(demux, 756 ++demux_pad, 757 entity, 0, 0); 758 if (ret) 759 return ret; 760 } 761 } 762 } 763 } 764 765 /* Create interface links for FE->tuner, DVR->demux and CA->ca */ 766 media_device_for_each_intf(intf, mdev) { 767 if (intf->type == MEDIA_INTF_T_DVB_CA && ca) { 768 link = media_create_intf_link(ca, intf, 769 MEDIA_LNK_FL_ENABLED | 770 MEDIA_LNK_FL_IMMUTABLE); 771 if (!link) 772 return -ENOMEM; 773 } 774 775 if (intf->type == MEDIA_INTF_T_DVB_FE && tuner) { 776 link = media_create_intf_link(tuner, intf, 777 MEDIA_LNK_FL_ENABLED | 778 MEDIA_LNK_FL_IMMUTABLE); 779 if (!link) 780 return -ENOMEM; 781 } 782 #if 0 783 /* 784 * Indirect link - let's not create yet, as we don't know how 785 * to handle indirect links, nor if this will 786 * actually be needed. 787 */ 788 if (intf->type == MEDIA_INTF_T_DVB_DVR && demux) { 789 link = media_create_intf_link(demux, intf, 790 MEDIA_LNK_FL_ENABLED | 791 MEDIA_LNK_FL_IMMUTABLE); 792 if (!link) 793 return -ENOMEM; 794 } 795 #endif 796 if (intf->type == MEDIA_INTF_T_DVB_DVR) { 797 ret = dvb_create_io_intf_links(adap, intf, DVR_TSOUT); 798 if (ret) 799 return ret; 800 } 801 if (intf->type == MEDIA_INTF_T_DVB_DEMUX) { 802 ret = dvb_create_io_intf_links(adap, intf, DEMUX_TSOUT); 803 if (ret) 804 return ret; 805 } 806 } 807 return 0; 808 } 809 EXPORT_SYMBOL_GPL(dvb_create_media_graph); 810 #endif 811 812 static int dvbdev_check_free_adapter_num(int num) 813 { 814 struct list_head *entry; 815 list_for_each(entry, &dvb_adapter_list) { 816 struct dvb_adapter *adap; 817 adap = list_entry(entry, struct dvb_adapter, list_head); 818 if (adap->num == num) 819 return 0; 820 } 821 return 1; 822 } 823 824 static int dvbdev_get_free_adapter_num (void) 825 { 826 int num = 0; 827 828 while (num < DVB_MAX_ADAPTERS) { 829 if (dvbdev_check_free_adapter_num(num)) 830 return num; 831 num++; 832 } 833 834 return -ENFILE; 835 } 836 837 838 int dvb_register_adapter(struct dvb_adapter *adap, const char *name, 839 struct module *module, struct device *device, 840 short *adapter_nums) 841 { 842 int i, num; 843 844 mutex_lock(&dvbdev_register_lock); 845 846 for (i = 0; i < DVB_MAX_ADAPTERS; ++i) { 847 num = adapter_nums[i]; 848 if (num >= 0 && num < DVB_MAX_ADAPTERS) { 849 /* use the one the driver asked for */ 850 if (dvbdev_check_free_adapter_num(num)) 851 break; 852 } else { 853 num = dvbdev_get_free_adapter_num(); 854 break; 855 } 856 num = -1; 857 } 858 859 if (num < 0) { 860 mutex_unlock(&dvbdev_register_lock); 861 return -ENFILE; 862 } 863 864 memset (adap, 0, sizeof(struct dvb_adapter)); 865 INIT_LIST_HEAD (&adap->device_list); 866 867 pr_info("DVB: registering new adapter (%s)\n", name); 868 869 adap->num = num; 870 adap->name = name; 871 adap->module = module; 872 adap->device = device; 873 adap->mfe_shared = 0; 874 adap->mfe_dvbdev = NULL; 875 mutex_init (&adap->mfe_lock); 876 877 #ifdef CONFIG_MEDIA_CONTROLLER_DVB 878 mutex_init(&adap->mdev_lock); 879 #endif 880 881 list_add_tail (&adap->list_head, &dvb_adapter_list); 882 883 mutex_unlock(&dvbdev_register_lock); 884 885 return num; 886 } 887 EXPORT_SYMBOL(dvb_register_adapter); 888 889 890 int dvb_unregister_adapter(struct dvb_adapter *adap) 891 { 892 mutex_lock(&dvbdev_register_lock); 893 list_del (&adap->list_head); 894 mutex_unlock(&dvbdev_register_lock); 895 return 0; 896 } 897 EXPORT_SYMBOL(dvb_unregister_adapter); 898 899 /* if the miracle happens and "generic_usercopy()" is included into 900 the kernel, then this can vanish. please don't make the mistake and 901 define this as video_usercopy(). this will introduce a dependency 902 to the v4l "videodev.o" module, which is unnecessary for some 903 cards (ie. the budget dvb-cards don't need the v4l module...) */ 904 int dvb_usercopy(struct file *file, 905 unsigned int cmd, unsigned long arg, 906 int (*func)(struct file *file, 907 unsigned int cmd, void *arg)) 908 { 909 char sbuf[128]; 910 void *mbuf = NULL; 911 void *parg = NULL; 912 int err = -EINVAL; 913 914 /* Copy arguments into temp kernel buffer */ 915 switch (_IOC_DIR(cmd)) { 916 case _IOC_NONE: 917 /* 918 * For this command, the pointer is actually an integer 919 * argument. 920 */ 921 parg = (void *) arg; 922 break; 923 case _IOC_READ: /* some v4l ioctls are marked wrong ... */ 924 case _IOC_WRITE: 925 case (_IOC_WRITE | _IOC_READ): 926 if (_IOC_SIZE(cmd) <= sizeof(sbuf)) { 927 parg = sbuf; 928 } else { 929 /* too big to allocate from stack */ 930 mbuf = kmalloc(_IOC_SIZE(cmd), GFP_KERNEL); 931 if (NULL == mbuf) 932 return -ENOMEM; 933 parg = mbuf; 934 } 935 936 err = -EFAULT; 937 if (copy_from_user(parg, (void __user *)arg, _IOC_SIZE(cmd))) 938 goto out; 939 break; 940 } 941 942 /* call driver */ 943 if ((err = func(file, cmd, parg)) == -ENOIOCTLCMD) 944 err = -ENOTTY; 945 946 if (err < 0) 947 goto out; 948 949 /* Copy results into user buffer */ 950 switch (_IOC_DIR(cmd)) 951 { 952 case _IOC_READ: 953 case (_IOC_WRITE | _IOC_READ): 954 if (copy_to_user((void __user *)arg, parg, _IOC_SIZE(cmd))) 955 err = -EFAULT; 956 break; 957 } 958 959 out: 960 kfree(mbuf); 961 return err; 962 } 963 964 #if IS_ENABLED(CONFIG_I2C) 965 struct i2c_client *dvb_module_probe(const char *module_name, 966 const char *name, 967 struct i2c_adapter *adap, 968 unsigned char addr, 969 void *platform_data) 970 { 971 struct i2c_client *client; 972 struct i2c_board_info *board_info; 973 974 board_info = kzalloc(sizeof(*board_info), GFP_KERNEL); 975 if (!board_info) 976 return NULL; 977 978 if (name) 979 strscpy(board_info->type, name, I2C_NAME_SIZE); 980 else 981 strscpy(board_info->type, module_name, I2C_NAME_SIZE); 982 983 board_info->addr = addr; 984 board_info->platform_data = platform_data; 985 request_module(module_name); 986 client = i2c_new_client_device(adap, board_info); 987 if (!i2c_client_has_driver(client)) { 988 kfree(board_info); 989 return NULL; 990 } 991 992 if (!try_module_get(client->dev.driver->owner)) { 993 i2c_unregister_device(client); 994 client = NULL; 995 } 996 997 kfree(board_info); 998 return client; 999 } 1000 EXPORT_SYMBOL_GPL(dvb_module_probe); 1001 1002 void dvb_module_release(struct i2c_client *client) 1003 { 1004 if (!client) 1005 return; 1006 1007 module_put(client->dev.driver->owner); 1008 i2c_unregister_device(client); 1009 } 1010 EXPORT_SYMBOL_GPL(dvb_module_release); 1011 #endif 1012 1013 static int dvb_uevent(struct device *dev, struct kobj_uevent_env *env) 1014 { 1015 struct dvb_device *dvbdev = dev_get_drvdata(dev); 1016 1017 add_uevent_var(env, "DVB_ADAPTER_NUM=%d", dvbdev->adapter->num); 1018 add_uevent_var(env, "DVB_DEVICE_TYPE=%s", dnames[dvbdev->type]); 1019 add_uevent_var(env, "DVB_DEVICE_NUM=%d", dvbdev->id); 1020 return 0; 1021 } 1022 1023 static char *dvb_devnode(struct device *dev, umode_t *mode) 1024 { 1025 struct dvb_device *dvbdev = dev_get_drvdata(dev); 1026 1027 return kasprintf(GFP_KERNEL, "dvb/adapter%d/%s%d", 1028 dvbdev->adapter->num, dnames[dvbdev->type], dvbdev->id); 1029 } 1030 1031 1032 static int __init init_dvbdev(void) 1033 { 1034 int retval; 1035 dev_t dev = MKDEV(DVB_MAJOR, 0); 1036 1037 if ((retval = register_chrdev_region(dev, MAX_DVB_MINORS, "DVB")) != 0) { 1038 pr_err("dvb-core: unable to get major %d\n", DVB_MAJOR); 1039 return retval; 1040 } 1041 1042 cdev_init(&dvb_device_cdev, &dvb_device_fops); 1043 if ((retval = cdev_add(&dvb_device_cdev, dev, MAX_DVB_MINORS)) != 0) { 1044 pr_err("dvb-core: unable register character device\n"); 1045 goto error; 1046 } 1047 1048 dvb_class = class_create(THIS_MODULE, "dvb"); 1049 if (IS_ERR(dvb_class)) { 1050 retval = PTR_ERR(dvb_class); 1051 goto error; 1052 } 1053 dvb_class->dev_uevent = dvb_uevent; 1054 dvb_class->devnode = dvb_devnode; 1055 return 0; 1056 1057 error: 1058 cdev_del(&dvb_device_cdev); 1059 unregister_chrdev_region(dev, MAX_DVB_MINORS); 1060 return retval; 1061 } 1062 1063 1064 static void __exit exit_dvbdev(void) 1065 { 1066 class_destroy(dvb_class); 1067 cdev_del(&dvb_device_cdev); 1068 unregister_chrdev_region(MKDEV(DVB_MAJOR, 0), MAX_DVB_MINORS); 1069 } 1070 1071 subsys_initcall(init_dvbdev); 1072 module_exit(exit_dvbdev); 1073 1074 MODULE_DESCRIPTION("DVB Core Driver"); 1075 MODULE_AUTHOR("Marcus Metzler, Ralph Metzler, Holger Waechtler"); 1076 MODULE_LICENSE("GPL"); 1077