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, 444 &dvbdev->intf_devnode->intf, 445 MEDIA_LNK_FL_ENABLED | 446 MEDIA_LNK_FL_IMMUTABLE); 447 if (!link) 448 return -ENOMEM; 449 #endif 450 return 0; 451 } 452 453 int dvb_register_device(struct dvb_adapter *adap, struct dvb_device **pdvbdev, 454 const struct dvb_device *template, void *priv, 455 enum dvb_device_type type, int demux_sink_pads) 456 { 457 struct dvb_device *dvbdev; 458 struct file_operations *dvbdevfops; 459 struct device *clsdev; 460 int minor; 461 int id, ret; 462 463 mutex_lock(&dvbdev_register_lock); 464 465 if ((id = dvbdev_get_free_id (adap, type)) < 0){ 466 mutex_unlock(&dvbdev_register_lock); 467 *pdvbdev = NULL; 468 pr_err("%s: couldn't find free device id\n", __func__); 469 return -ENFILE; 470 } 471 472 *pdvbdev = dvbdev = kzalloc(sizeof(*dvbdev), GFP_KERNEL); 473 474 if (!dvbdev){ 475 mutex_unlock(&dvbdev_register_lock); 476 return -ENOMEM; 477 } 478 479 dvbdevfops = kzalloc(sizeof(struct file_operations), GFP_KERNEL); 480 481 if (!dvbdevfops){ 482 kfree (dvbdev); 483 mutex_unlock(&dvbdev_register_lock); 484 return -ENOMEM; 485 } 486 487 memcpy(dvbdev, template, sizeof(struct dvb_device)); 488 dvbdev->type = type; 489 dvbdev->id = id; 490 dvbdev->adapter = adap; 491 dvbdev->priv = priv; 492 dvbdev->fops = dvbdevfops; 493 init_waitqueue_head (&dvbdev->wait_queue); 494 495 memcpy(dvbdevfops, template->fops, sizeof(struct file_operations)); 496 dvbdevfops->owner = adap->module; 497 498 list_add_tail (&dvbdev->list_head, &adap->device_list); 499 500 down_write(&minor_rwsem); 501 #ifdef CONFIG_DVB_DYNAMIC_MINORS 502 for (minor = 0; minor < MAX_DVB_MINORS; minor++) 503 if (dvb_minors[minor] == NULL) 504 break; 505 506 if (minor == MAX_DVB_MINORS) { 507 kfree(dvbdevfops); 508 kfree(dvbdev); 509 up_write(&minor_rwsem); 510 mutex_unlock(&dvbdev_register_lock); 511 return -EINVAL; 512 } 513 #else 514 minor = nums2minor(adap->num, type, id); 515 #endif 516 517 dvbdev->minor = minor; 518 dvb_minors[minor] = dvbdev; 519 up_write(&minor_rwsem); 520 521 ret = dvb_register_media_device(dvbdev, type, minor, demux_sink_pads); 522 if (ret) { 523 pr_err("%s: dvb_register_media_device failed to create the mediagraph\n", 524 __func__); 525 526 dvb_media_device_free(dvbdev); 527 kfree(dvbdevfops); 528 kfree(dvbdev); 529 up_write(&minor_rwsem); 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; 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 ret = media_create_pad_links(mdev, 694 MEDIA_ENT_F_CONN_RF, 695 conn, 0, 696 MEDIA_ENT_F_TUNER, 697 tuner, TUNER_PAD_RF_INPUT, 698 MEDIA_LNK_FL_ENABLED, 699 false); 700 if (ret) 701 return ret; 702 } 703 704 if (ntuner && ndemod) { 705 ret = media_create_pad_links(mdev, 706 MEDIA_ENT_F_TUNER, 707 tuner, TUNER_PAD_OUTPUT, 708 MEDIA_ENT_F_DTV_DEMOD, 709 demod, 0, MEDIA_LNK_FL_ENABLED, 710 false); 711 if (ret) 712 return ret; 713 } 714 715 if (ndemod && demux) { 716 ret = media_create_pad_links(mdev, 717 MEDIA_ENT_F_DTV_DEMOD, 718 demod, 1, 719 MEDIA_ENT_F_TS_DEMUX, 720 demux, 0, MEDIA_LNK_FL_ENABLED, 721 false); 722 if (ret) 723 return ret; 724 } 725 if (demux && ca) { 726 ret = media_create_pad_link(demux, 1, ca, 727 0, MEDIA_LNK_FL_ENABLED); 728 if (ret) 729 return ret; 730 } 731 732 /* Create demux links for each ringbuffer/pad */ 733 if (demux) { 734 media_device_for_each_entity(entity, mdev) { 735 if (entity->function == MEDIA_ENT_F_IO_DTV) { 736 if (!strncmp(entity->name, DVR_TSOUT, 737 strlen(DVR_TSOUT))) { 738 ret = media_create_pad_link(demux, 739 ++dvr_pad, 740 entity, 0, 0); 741 if (ret) 742 return ret; 743 } 744 if (!strncmp(entity->name, DEMUX_TSOUT, 745 strlen(DEMUX_TSOUT))) { 746 ret = media_create_pad_link(demux, 747 ++demux_pad, 748 entity, 0, 0); 749 if (ret) 750 return ret; 751 } 752 } 753 } 754 } 755 756 /* Create interface links for FE->tuner, DVR->demux and CA->ca */ 757 media_device_for_each_intf(intf, mdev) { 758 if (intf->type == MEDIA_INTF_T_DVB_CA && ca) { 759 link = media_create_intf_link(ca, intf, 760 MEDIA_LNK_FL_ENABLED | 761 MEDIA_LNK_FL_IMMUTABLE); 762 if (!link) 763 return -ENOMEM; 764 } 765 766 if (intf->type == MEDIA_INTF_T_DVB_FE && tuner) { 767 link = media_create_intf_link(tuner, intf, 768 MEDIA_LNK_FL_ENABLED | 769 MEDIA_LNK_FL_IMMUTABLE); 770 if (!link) 771 return -ENOMEM; 772 } 773 #if 0 774 /* 775 * Indirect link - let's not create yet, as we don't know how 776 * to handle indirect links, nor if this will 777 * actually be needed. 778 */ 779 if (intf->type == MEDIA_INTF_T_DVB_DVR && demux) { 780 link = media_create_intf_link(demux, intf, 781 MEDIA_LNK_FL_ENABLED | 782 MEDIA_LNK_FL_IMMUTABLE); 783 if (!link) 784 return -ENOMEM; 785 } 786 #endif 787 if (intf->type == MEDIA_INTF_T_DVB_DVR) { 788 ret = dvb_create_io_intf_links(adap, intf, DVR_TSOUT); 789 if (ret) 790 return ret; 791 } 792 if (intf->type == MEDIA_INTF_T_DVB_DEMUX) { 793 ret = dvb_create_io_intf_links(adap, intf, DEMUX_TSOUT); 794 if (ret) 795 return ret; 796 } 797 } 798 return 0; 799 } 800 EXPORT_SYMBOL_GPL(dvb_create_media_graph); 801 #endif 802 803 static int dvbdev_check_free_adapter_num(int num) 804 { 805 struct list_head *entry; 806 list_for_each(entry, &dvb_adapter_list) { 807 struct dvb_adapter *adap; 808 adap = list_entry(entry, struct dvb_adapter, list_head); 809 if (adap->num == num) 810 return 0; 811 } 812 return 1; 813 } 814 815 static int dvbdev_get_free_adapter_num (void) 816 { 817 int num = 0; 818 819 while (num < DVB_MAX_ADAPTERS) { 820 if (dvbdev_check_free_adapter_num(num)) 821 return num; 822 num++; 823 } 824 825 return -ENFILE; 826 } 827 828 829 int dvb_register_adapter(struct dvb_adapter *adap, const char *name, 830 struct module *module, struct device *device, 831 short *adapter_nums) 832 { 833 int i, num; 834 835 mutex_lock(&dvbdev_register_lock); 836 837 for (i = 0; i < DVB_MAX_ADAPTERS; ++i) { 838 num = adapter_nums[i]; 839 if (num >= 0 && num < DVB_MAX_ADAPTERS) { 840 /* use the one the driver asked for */ 841 if (dvbdev_check_free_adapter_num(num)) 842 break; 843 } else { 844 num = dvbdev_get_free_adapter_num(); 845 break; 846 } 847 num = -1; 848 } 849 850 if (num < 0) { 851 mutex_unlock(&dvbdev_register_lock); 852 return -ENFILE; 853 } 854 855 memset (adap, 0, sizeof(struct dvb_adapter)); 856 INIT_LIST_HEAD (&adap->device_list); 857 858 pr_info("DVB: registering new adapter (%s)\n", name); 859 860 adap->num = num; 861 adap->name = name; 862 adap->module = module; 863 adap->device = device; 864 adap->mfe_shared = 0; 865 adap->mfe_dvbdev = NULL; 866 mutex_init (&adap->mfe_lock); 867 868 #ifdef CONFIG_MEDIA_CONTROLLER_DVB 869 mutex_init(&adap->mdev_lock); 870 #endif 871 872 list_add_tail (&adap->list_head, &dvb_adapter_list); 873 874 mutex_unlock(&dvbdev_register_lock); 875 876 return num; 877 } 878 EXPORT_SYMBOL(dvb_register_adapter); 879 880 881 int dvb_unregister_adapter(struct dvb_adapter *adap) 882 { 883 mutex_lock(&dvbdev_register_lock); 884 list_del (&adap->list_head); 885 mutex_unlock(&dvbdev_register_lock); 886 return 0; 887 } 888 EXPORT_SYMBOL(dvb_unregister_adapter); 889 890 /* if the miracle happens and "generic_usercopy()" is included into 891 the kernel, then this can vanish. please don't make the mistake and 892 define this as video_usercopy(). this will introduce a dependecy 893 to the v4l "videodev.o" module, which is unnecessary for some 894 cards (ie. the budget dvb-cards don't need the v4l module...) */ 895 int dvb_usercopy(struct file *file, 896 unsigned int cmd, unsigned long arg, 897 int (*func)(struct file *file, 898 unsigned int cmd, void *arg)) 899 { 900 char sbuf[128]; 901 void *mbuf = NULL; 902 void *parg = NULL; 903 int err = -EINVAL; 904 905 /* Copy arguments into temp kernel buffer */ 906 switch (_IOC_DIR(cmd)) { 907 case _IOC_NONE: 908 /* 909 * For this command, the pointer is actually an integer 910 * argument. 911 */ 912 parg = (void *) arg; 913 break; 914 case _IOC_READ: /* some v4l ioctls are marked wrong ... */ 915 case _IOC_WRITE: 916 case (_IOC_WRITE | _IOC_READ): 917 if (_IOC_SIZE(cmd) <= sizeof(sbuf)) { 918 parg = sbuf; 919 } else { 920 /* too big to allocate from stack */ 921 mbuf = kmalloc(_IOC_SIZE(cmd), GFP_KERNEL); 922 if (NULL == mbuf) 923 return -ENOMEM; 924 parg = mbuf; 925 } 926 927 err = -EFAULT; 928 if (copy_from_user(parg, (void __user *)arg, _IOC_SIZE(cmd))) 929 goto out; 930 break; 931 } 932 933 /* call driver */ 934 if ((err = func(file, cmd, parg)) == -ENOIOCTLCMD) 935 err = -ENOTTY; 936 937 if (err < 0) 938 goto out; 939 940 /* Copy results into user buffer */ 941 switch (_IOC_DIR(cmd)) 942 { 943 case _IOC_READ: 944 case (_IOC_WRITE | _IOC_READ): 945 if (copy_to_user((void __user *)arg, parg, _IOC_SIZE(cmd))) 946 err = -EFAULT; 947 break; 948 } 949 950 out: 951 kfree(mbuf); 952 return err; 953 } 954 955 #if IS_ENABLED(CONFIG_I2C) 956 struct i2c_client *dvb_module_probe(const char *module_name, 957 const char *name, 958 struct i2c_adapter *adap, 959 unsigned char addr, 960 void *platform_data) 961 { 962 struct i2c_client *client; 963 struct i2c_board_info *board_info; 964 965 board_info = kzalloc(sizeof(*board_info), GFP_KERNEL); 966 if (!board_info) 967 return NULL; 968 969 if (name) 970 strlcpy(board_info->type, name, I2C_NAME_SIZE); 971 else 972 strlcpy(board_info->type, module_name, I2C_NAME_SIZE); 973 974 board_info->addr = addr; 975 board_info->platform_data = platform_data; 976 request_module(module_name); 977 client = i2c_new_device(adap, board_info); 978 if (client == NULL || client->dev.driver == NULL) { 979 kfree(board_info); 980 return NULL; 981 } 982 983 if (!try_module_get(client->dev.driver->owner)) { 984 i2c_unregister_device(client); 985 client = NULL; 986 } 987 988 kfree(board_info); 989 return client; 990 } 991 EXPORT_SYMBOL_GPL(dvb_module_probe); 992 993 void dvb_module_release(struct i2c_client *client) 994 { 995 if (!client) 996 return; 997 998 module_put(client->dev.driver->owner); 999 i2c_unregister_device(client); 1000 } 1001 EXPORT_SYMBOL_GPL(dvb_module_release); 1002 #endif 1003 1004 static int dvb_uevent(struct device *dev, struct kobj_uevent_env *env) 1005 { 1006 struct dvb_device *dvbdev = dev_get_drvdata(dev); 1007 1008 add_uevent_var(env, "DVB_ADAPTER_NUM=%d", dvbdev->adapter->num); 1009 add_uevent_var(env, "DVB_DEVICE_TYPE=%s", dnames[dvbdev->type]); 1010 add_uevent_var(env, "DVB_DEVICE_NUM=%d", dvbdev->id); 1011 return 0; 1012 } 1013 1014 static char *dvb_devnode(struct device *dev, umode_t *mode) 1015 { 1016 struct dvb_device *dvbdev = dev_get_drvdata(dev); 1017 1018 return kasprintf(GFP_KERNEL, "dvb/adapter%d/%s%d", 1019 dvbdev->adapter->num, dnames[dvbdev->type], dvbdev->id); 1020 } 1021 1022 1023 static int __init init_dvbdev(void) 1024 { 1025 int retval; 1026 dev_t dev = MKDEV(DVB_MAJOR, 0); 1027 1028 if ((retval = register_chrdev_region(dev, MAX_DVB_MINORS, "DVB")) != 0) { 1029 pr_err("dvb-core: unable to get major %d\n", DVB_MAJOR); 1030 return retval; 1031 } 1032 1033 cdev_init(&dvb_device_cdev, &dvb_device_fops); 1034 if ((retval = cdev_add(&dvb_device_cdev, dev, MAX_DVB_MINORS)) != 0) { 1035 pr_err("dvb-core: unable register character device\n"); 1036 goto error; 1037 } 1038 1039 dvb_class = class_create(THIS_MODULE, "dvb"); 1040 if (IS_ERR(dvb_class)) { 1041 retval = PTR_ERR(dvb_class); 1042 goto error; 1043 } 1044 dvb_class->dev_uevent = dvb_uevent; 1045 dvb_class->devnode = dvb_devnode; 1046 return 0; 1047 1048 error: 1049 cdev_del(&dvb_device_cdev); 1050 unregister_chrdev_region(dev, MAX_DVB_MINORS); 1051 return retval; 1052 } 1053 1054 1055 static void __exit exit_dvbdev(void) 1056 { 1057 class_destroy(dvb_class); 1058 cdev_del(&dvb_device_cdev); 1059 unregister_chrdev_region(MKDEV(DVB_MAJOR, 0), MAX_DVB_MINORS); 1060 } 1061 1062 subsys_initcall(init_dvbdev); 1063 module_exit(exit_dvbdev); 1064 1065 MODULE_DESCRIPTION("DVB Core Driver"); 1066 MODULE_AUTHOR("Marcus Metzler, Ralph Metzler, Holger Waechtler"); 1067 MODULE_LICENSE("GPL"); 1068