drivers/media/dvb-core/dvbdev.c

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