drivers/media/dvb-core/dvbdev.c

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