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  * You should have received a copy of the GNU Lesser General Public License
  19  * along with this program; if not, write to the Free Software
  20  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
  21  *
  22  */
  23
  24 #include <linux/types.h>
  25 #include <linux/errno.h>
  26 #include <linux/string.h>
  27 #include <linux/module.h>
  28 #include <linux/kernel.h>
  29 #include <linux/init.h>
  30 #include <linux/slab.h>
  31 #include <linux/device.h>
  32 #include <linux/fs.h>
  33 #include <linux/cdev.h>
  34 #include <linux/mutex.h>
  35 #include "dvbdev.h"
  36
  37 /* Due to enum tuner_pad_index */
  38 #include <media/tuner.h>
  39
  40 static DEFINE_MUTEX(dvbdev_mutex);
  41 static int dvbdev_debug;
  42
  43 module_param(dvbdev_debug, int, 0644);
  44 MODULE_PARM_DESC(dvbdev_debug, "Turn on/off device debugging (default:off).");
  45
  46 #define dprintk if (dvbdev_debug) printk
  47
  48 static LIST_HEAD(dvb_adapter_list);
  49 static DEFINE_MUTEX(dvbdev_register_lock);
  50
  51 static const char * const dnames[] = {
  52         "video", "audio", "sec", "frontend", "demux", "dvr", "ca",
  53         "net", "osd"
  54 };
  55
  56 #ifdef CONFIG_DVB_DYNAMIC_MINORS
  57 #define MAX_DVB_MINORS          256
  58 #define DVB_MAX_IDS             MAX_DVB_MINORS
  59 #else
  60 #define DVB_MAX_IDS             4
  61 #define nums2minor(num, type, id)       ((num << 6) | (id << 4) | type)
  62 #define MAX_DVB_MINORS          (DVB_MAX_ADAPTERS*64)
  63 #endif
  64
  65 static struct class *dvb_class;
  66
  67 static struct dvb_device *dvb_minors[MAX_DVB_MINORS];
  68 static DECLARE_RWSEM(minor_rwsem);
  69
  70 static int dvb_device_open(struct inode *inode, struct file *file)
  71 {
  72         struct dvb_device *dvbdev;
  73
  74         mutex_lock(&dvbdev_mutex);
  75         down_read(&minor_rwsem);
  76         dvbdev = dvb_minors[iminor(inode)];
  77
  78         if (dvbdev && dvbdev->fops) {
  79                 int err = 0;
  80                 const struct file_operations *new_fops;
  81
  82                 new_fops = fops_get(dvbdev->fops);
  83                 if (!new_fops)
  84                         goto fail;
  85                 file->private_data = dvbdev;
  86                 replace_fops(file, new_fops);
  87                 if (file->f_op->open)
  88                         err = file->f_op->open(inode, file);
  89                 up_read(&minor_rwsem);
  90                 mutex_unlock(&dvbdev_mutex);
  91                 return err;
  92         }
  93 fail:
  94         up_read(&minor_rwsem);
  95         mutex_unlock(&dvbdev_mutex);
  96         return -ENODEV;
  97 }
  98
  99
 100 static const struct file_operations dvb_device_fops =
 101 {
 102         .owner =        THIS_MODULE,
 103         .open =         dvb_device_open,
 104         .llseek =       noop_llseek,
 105 };
 106
 107 static struct cdev dvb_device_cdev;
 108
 109 int dvb_generic_open(struct inode *inode, struct file *file)
 110 {
 111         struct dvb_device *dvbdev = file->private_data;
 112
 113         if (!dvbdev)
 114                 return -ENODEV;
 115
 116         if (!dvbdev->users)
 117                 return -EBUSY;
 118
 119         if ((file->f_flags & O_ACCMODE) == O_RDONLY) {
 120                 if (!dvbdev->readers)
 121                         return -EBUSY;
 122                 dvbdev->readers--;
 123         } else {
 124                 if (!dvbdev->writers)
 125                         return -EBUSY;
 126                 dvbdev->writers--;
 127         }
 128
 129         dvbdev->users--;
 130         return 0;
 131 }
 132 EXPORT_SYMBOL(dvb_generic_open);
 133
 134
 135 int dvb_generic_release(struct inode *inode, struct file *file)
 136 {
 137         struct dvb_device *dvbdev = file->private_data;
 138
 139         if (!dvbdev)
 140                 return -ENODEV;
 141
 142         if ((file->f_flags & O_ACCMODE) == O_RDONLY) {
 143                 dvbdev->readers++;
 144         } else {
 145                 dvbdev->writers++;
 146         }
 147
 148         dvbdev->users++;
 149         return 0;
 150 }
 151 EXPORT_SYMBOL(dvb_generic_release);
 152
 153
 154 long dvb_generic_ioctl(struct file *file,
 155                        unsigned int cmd, unsigned long arg)
 156 {
 157         struct dvb_device *dvbdev = file->private_data;
 158
 159         if (!dvbdev)
 160                 return -ENODEV;
 161
 162         if (!dvbdev->kernel_ioctl)
 163                 return -EINVAL;
 164
 165         return dvb_usercopy(file, cmd, arg, dvbdev->kernel_ioctl);
 166 }
 167 EXPORT_SYMBOL(dvb_generic_ioctl);
 168
 169
 170 static int dvbdev_get_free_id (struct dvb_adapter *adap, int type)
 171 {
 172         u32 id = 0;
 173
 174         while (id < DVB_MAX_IDS) {
 175                 struct dvb_device *dev;
 176                 list_for_each_entry(dev, &adap->device_list, list_head)
 177                         if (dev->type == type && dev->id == id)
 178                                 goto skip;
 179                 return id;
 180 skip:
 181                 id++;
 182         }
 183         return -ENFILE;
 184 }
 185
 186 static void dvb_media_device_free(struct dvb_device *dvbdev)
 187 {
 188 #if defined(CONFIG_MEDIA_CONTROLLER_DVB)
 189         if (dvbdev->entity) {
 190                 media_device_unregister_entity(dvbdev->entity);
 191                 kfree(dvbdev->entity);
 192                 kfree(dvbdev->pads);
 193                 dvbdev->entity = NULL;
 194                 dvbdev->pads = NULL;
 195         }
 196
 197         if (dvbdev->tsout_entity) {
 198                 int i;
 199
 200                 for (i = 0; i < dvbdev->tsout_num_entities; i++) {
 201                         media_device_unregister_entity(&dvbdev->tsout_entity[i]);
 202                         kfree(dvbdev->tsout_entity[i].name);
 203                 }
 204                 kfree(dvbdev->tsout_entity);
 205                 kfree(dvbdev->tsout_pads);
 206                 dvbdev->tsout_entity = NULL;
 207                 dvbdev->tsout_pads = NULL;
 208
 209                 dvbdev->tsout_num_entities = 0;
 210         }
 211
 212         if (dvbdev->intf_devnode) {
 213                 media_devnode_remove(dvbdev->intf_devnode);
 214                 dvbdev->intf_devnode = NULL;
 215         }
 216
 217         if (dvbdev->adapter->conn) {
 218                 media_device_unregister_entity(dvbdev->adapter->conn);
 219                 dvbdev->adapter->conn = NULL;
 220                 kfree(dvbdev->adapter->conn_pads);
 221                 dvbdev->adapter->conn_pads = NULL;
 222         }
 223 #endif
 224 }
 225
 226 #if defined(CONFIG_MEDIA_CONTROLLER_DVB)
 227 static int dvb_create_tsout_entity(struct dvb_device *dvbdev,
 228                                     const char *name, int npads)
 229 {
 230         int i, ret = 0;
 231
 232         dvbdev->tsout_pads = kcalloc(npads, sizeof(*dvbdev->tsout_pads),
 233                                      GFP_KERNEL);
 234         if (!dvbdev->tsout_pads)
 235                 return -ENOMEM;
 236
 237         dvbdev->tsout_entity = kcalloc(npads, sizeof(*dvbdev->tsout_entity),
 238                                        GFP_KERNEL);
 239         if (!dvbdev->tsout_entity)
 240                 return -ENOMEM;
 241
 242         dvbdev->tsout_num_entities = npads;
 243
 244         for (i = 0; i < npads; i++) {
 245                 struct media_pad *pads = &dvbdev->tsout_pads[i];
 246                 struct media_entity *entity = &dvbdev->tsout_entity[i];
 247
 248                 entity->name = kasprintf(GFP_KERNEL, "%s #%d", name, i);
 249                 if (!entity->name)
 250                         return -ENOMEM;
 251
 252                 entity->function = MEDIA_ENT_F_IO_DTV;
 253                 pads->flags = MEDIA_PAD_FL_SINK;
 254
 255                 ret = media_entity_pads_init(entity, 1, pads);
 256                 if (ret < 0)
 257                         return ret;
 258
 259                 ret = media_device_register_entity(dvbdev->adapter->mdev,
 260                                                    entity);
 261                 if (ret < 0)
 262                         return ret;
 263         }
 264         return 0;
 265 }
 266
 267 #define DEMUX_TSOUT     "demux-tsout"
 268 #define DVR_TSOUT       "dvr-tsout"
 269
 270 static int dvb_create_media_entity(struct dvb_device *dvbdev,
 271                                    int type, int demux_sink_pads)
 272 {
 273         int i, ret, npads;
 274
 275         switch (type) {
 276         case DVB_DEVICE_FRONTEND:
 277                 npads = 2;
 278                 break;
 279         case DVB_DEVICE_DVR:
 280                 ret = dvb_create_tsout_entity(dvbdev, DVR_TSOUT,
 281                                               demux_sink_pads);
 282                 return ret;
 283         case DVB_DEVICE_DEMUX:
 284                 npads = 1 + demux_sink_pads;
 285                 ret = dvb_create_tsout_entity(dvbdev, DEMUX_TSOUT,
 286                                               demux_sink_pads);
 287                 if (ret < 0)
 288                         return ret;
 289                 break;
 290         case DVB_DEVICE_CA:
 291                 npads = 2;
 292                 break;
 293         case DVB_DEVICE_NET:
 294                 /*
 295                  * We should be creating entities for the MPE/ULE
 296                  * decapsulation hardware (or software implementation).
 297                  *
 298                  * However, the number of for the MPE/ULE decaps may not be
 299                  * fixed. As we don't have yet dynamic support for PADs at
 300                  * the Media Controller, let's not create the decap
 301                  * entities yet.
 302                  */
 303                 return 0;
 304         default:
 305                 return 0;
 306         }
 307
 308         dvbdev->entity = kzalloc(sizeof(*dvbdev->entity), GFP_KERNEL);
 309         if (!dvbdev->entity)
 310                 return -ENOMEM;
 311
 312         dvbdev->entity->name = dvbdev->name;
 313
 314         if (npads) {
 315                 dvbdev->pads = kcalloc(npads, sizeof(*dvbdev->pads),
 316                                        GFP_KERNEL);
 317                 if (!dvbdev->pads)
 318                         return -ENOMEM;
 319         }
 320
 321         switch (type) {
 322         case DVB_DEVICE_FRONTEND:
 323                 dvbdev->entity->function = MEDIA_ENT_F_DTV_DEMOD;
 324                 dvbdev->pads[0].flags = MEDIA_PAD_FL_SINK;
 325                 dvbdev->pads[1].flags = MEDIA_PAD_FL_SOURCE;
 326                 break;
 327         case DVB_DEVICE_DEMUX:
 328                 dvbdev->entity->function = MEDIA_ENT_F_TS_DEMUX;
 329                 dvbdev->pads[0].flags = MEDIA_PAD_FL_SINK;
 330                 for (i = 1; i < npads; i++)
 331                         dvbdev->pads[i].flags = MEDIA_PAD_FL_SOURCE;
 332                 break;
 333         case DVB_DEVICE_CA:
 334                 dvbdev->entity->function = MEDIA_ENT_F_DTV_CA;
 335                 dvbdev->pads[0].flags = MEDIA_PAD_FL_SINK;
 336                 dvbdev->pads[1].flags = MEDIA_PAD_FL_SOURCE;
 337                 break;
 338         default:
 339                 /* Should never happen, as the first switch prevents it */
 340                 kfree(dvbdev->entity);
 341                 kfree(dvbdev->pads);
 342                 dvbdev->entity = NULL;
 343                 dvbdev->pads = NULL;
 344                 return 0;
 345         }
 346
 347         if (npads) {
 348                 ret = media_entity_pads_init(dvbdev->entity, npads, dvbdev->pads);
 349                 if (ret)
 350                         return ret;
 351         }
 352         ret = media_device_register_entity(dvbdev->adapter->mdev,
 353                                            dvbdev->entity);
 354         if (ret)
 355                 return ret;
 356
 357         printk(KERN_DEBUG "%s: media entity '%s' registered.\n",
 358                 __func__, dvbdev->entity->name);
 359
 360         return 0;
 361 }
 362 #endif
 363
 364 static int dvb_register_media_device(struct dvb_device *dvbdev,
 365                                      int type, int minor,
 366                                      unsigned demux_sink_pads)
 367 {
 368 #if defined(CONFIG_MEDIA_CONTROLLER_DVB)
 369         struct media_link *link;
 370         u32 intf_type;
 371         int ret;
 372
 373         if (!dvbdev->adapter->mdev)
 374                 return 0;
 375
 376         ret = dvb_create_media_entity(dvbdev, type, demux_sink_pads);
 377         if (ret)
 378                 return ret;
 379
 380         switch (type) {
 381         case DVB_DEVICE_FRONTEND:
 382                 intf_type = MEDIA_INTF_T_DVB_FE;
 383                 break;
 384         case DVB_DEVICE_DEMUX:
 385                 intf_type = MEDIA_INTF_T_DVB_DEMUX;
 386                 break;
 387         case DVB_DEVICE_DVR:
 388                 intf_type = MEDIA_INTF_T_DVB_DVR;
 389                 break;
 390         case DVB_DEVICE_CA:
 391                 intf_type = MEDIA_INTF_T_DVB_CA;
 392                 break;
 393         case DVB_DEVICE_NET:
 394                 intf_type = MEDIA_INTF_T_DVB_NET;
 395                 break;
 396         default:
 397                 return 0;
 398         }
 399
 400         dvbdev->intf_devnode = media_devnode_create(dvbdev->adapter->mdev,
 401                                                     intf_type, 0,
 402                                                     DVB_MAJOR, minor);
 403
 404         if (!dvbdev->intf_devnode)
 405                 return -ENOMEM;
 406
 407         /*
 408          * Create the "obvious" link, e. g. the ones that represent
 409          * a direct association between an interface and an entity.
 410          * Other links should be created elsewhere, like:
 411          *              DVB FE intf    -> tuner
 412          *              DVB demux intf -> dvr
 413          */
 414
 415         if (!dvbdev->entity)
 416                 return 0;
 417
 418         link = media_create_intf_link(dvbdev->entity, &dvbdev->intf_devnode->intf,
 419                                       MEDIA_LNK_FL_ENABLED);
 420         if (!link)
 421                 return -ENOMEM;
 422 #endif
 423         return 0;
 424 }
 425
 426 int dvb_register_device(struct dvb_adapter *adap, struct dvb_device **pdvbdev,
 427                         const struct dvb_device *template, void *priv, int type,
 428                         int demux_sink_pads)
 429 {
 430         struct dvb_device *dvbdev;
 431         struct file_operations *dvbdevfops;
 432         struct device *clsdev;
 433         int minor;
 434         int id, ret;
 435
 436         mutex_lock(&dvbdev_register_lock);
 437
 438         if ((id = dvbdev_get_free_id (adap, type)) < 0){
 439                 mutex_unlock(&dvbdev_register_lock);
 440                 *pdvbdev = NULL;
 441                 printk(KERN_ERR "%s: couldn't find free device id\n", __func__);
 442                 return -ENFILE;
 443         }
 444
 445         *pdvbdev = dvbdev = kzalloc(sizeof(*dvbdev), GFP_KERNEL);
 446
 447         if (!dvbdev){
 448                 mutex_unlock(&dvbdev_register_lock);
 449                 return -ENOMEM;
 450         }
 451
 452         dvbdevfops = kzalloc(sizeof(struct file_operations), GFP_KERNEL);
 453
 454         if (!dvbdevfops){
 455                 kfree (dvbdev);
 456                 mutex_unlock(&dvbdev_register_lock);
 457                 return -ENOMEM;
 458         }
 459
 460         memcpy(dvbdev, template, sizeof(struct dvb_device));
 461         dvbdev->type = type;
 462         dvbdev->id = id;
 463         dvbdev->adapter = adap;
 464         dvbdev->priv = priv;
 465         dvbdev->fops = dvbdevfops;
 466         init_waitqueue_head (&dvbdev->wait_queue);
 467
 468         memcpy(dvbdevfops, template->fops, sizeof(struct file_operations));
 469         dvbdevfops->owner = adap->module;
 470
 471         list_add_tail (&dvbdev->list_head, &adap->device_list);
 472
 473         down_write(&minor_rwsem);
 474 #ifdef CONFIG_DVB_DYNAMIC_MINORS
 475         for (minor = 0; minor < MAX_DVB_MINORS; minor++)
 476                 if (dvb_minors[minor] == NULL)
 477                         break;
 478
 479         if (minor == MAX_DVB_MINORS) {
 480                 kfree(dvbdevfops);
 481                 kfree(dvbdev);
 482                 up_write(&minor_rwsem);
 483                 mutex_unlock(&dvbdev_register_lock);
 484                 return -EINVAL;
 485         }
 486 #else
 487         minor = nums2minor(adap->num, type, id);
 488 #endif
 489
 490         dvbdev->minor = minor;
 491         dvb_minors[minor] = dvbdev;
 492         up_write(&minor_rwsem);
 493
 494         ret = dvb_register_media_device(dvbdev, type, minor, demux_sink_pads);
 495         if (ret) {
 496                 printk(KERN_ERR
 497                       "%s: dvb_register_media_device failed to create the mediagraph\n",
 498                       __func__);
 499
 500                 dvb_media_device_free(dvbdev);
 501                 kfree(dvbdevfops);
 502                 kfree(dvbdev);
 503                 up_write(&minor_rwsem);
 504                 mutex_unlock(&dvbdev_register_lock);
 505                 return ret;
 506         }
 507
 508         mutex_unlock(&dvbdev_register_lock);
 509
 510         clsdev = device_create(dvb_class, adap->device,
 511                                MKDEV(DVB_MAJOR, minor),
 512                                dvbdev, "dvb%d.%s%d", adap->num, dnames[type], id);
 513         if (IS_ERR(clsdev)) {
 514                 printk(KERN_ERR "%s: failed to create device dvb%d.%s%d (%ld)\n",
 515                        __func__, adap->num, dnames[type], id, PTR_ERR(clsdev));
 516                 return PTR_ERR(clsdev);
 517         }
 518         dprintk(KERN_DEBUG "DVB: register adapter%d/%s%d @ minor: %i (0x%02x)\n",
 519                 adap->num, dnames[type], id, minor, minor);
 520
 521         return 0;
 522 }
 523 EXPORT_SYMBOL(dvb_register_device);
 524
 525
 526 void dvb_unregister_device(struct dvb_device *dvbdev)
 527 {
 528         if (!dvbdev)
 529                 return;
 530
 531         down_write(&minor_rwsem);
 532         dvb_minors[dvbdev->minor] = NULL;
 533         up_write(&minor_rwsem);
 534
 535         dvb_media_device_free(dvbdev);
 536
 537         device_destroy(dvb_class, MKDEV(DVB_MAJOR, dvbdev->minor));
 538
 539         list_del (&dvbdev->list_head);
 540         kfree (dvbdev->fops);
 541         kfree (dvbdev);
 542 }
 543 EXPORT_SYMBOL(dvb_unregister_device);
 544
 545
 546 #ifdef CONFIG_MEDIA_CONTROLLER_DVB
 547
 548 static int dvb_create_io_intf_links(struct dvb_adapter *adap,
 549                                     struct media_interface *intf,
 550                                     char *name)
 551 {
 552         struct media_device *mdev = adap->mdev;
 553         struct media_entity *entity;
 554         struct media_link *link;
 555
 556         media_device_for_each_entity(entity, mdev) {
 557                 if (entity->function == MEDIA_ENT_F_IO_DTV) {
 558                         if (strncmp(entity->name, name, strlen(name)))
 559                                 continue;
 560                         link = media_create_intf_link(entity, intf,
 561                                                       MEDIA_LNK_FL_ENABLED);
 562                         if (!link)
 563                                 return -ENOMEM;
 564                 }
 565         }
 566         return 0;
 567 }
 568
 569 int dvb_create_media_graph(struct dvb_adapter *adap,
 570                            bool create_rf_connector)
 571 {
 572         struct media_device *mdev = adap->mdev;
 573         struct media_entity *entity, *tuner = NULL, *demod = NULL, *conn;
 574         struct media_entity *demux = NULL, *ca = NULL;
 575         struct media_link *link;
 576         struct media_interface *intf;
 577         unsigned demux_pad = 0;
 578         unsigned dvr_pad = 0;
 579         unsigned ntuner = 0, ndemod = 0;
 580         int ret;
 581         static const char *connector_name = "Television";
 582
 583         if (!mdev)
 584                 return 0;
 585
 586         media_device_for_each_entity(entity, mdev) {
 587                 switch (entity->function) {
 588                 case MEDIA_ENT_F_TUNER:
 589                         tuner = entity;
 590                         ntuner++;
 591                         break;
 592                 case MEDIA_ENT_F_DTV_DEMOD:
 593                         demod = entity;
 594                         ndemod++;
 595                         break;
 596                 case MEDIA_ENT_F_TS_DEMUX:
 597                         demux = entity;
 598                         break;
 599                 case MEDIA_ENT_F_DTV_CA:
 600                         ca = entity;
 601                         break;
 602                 }
 603         }
 604
 605         /*
 606          * Prepare to signalize to media_create_pad_links() that multiple
 607          * entities of the same type exists and a 1:n or n:1 links need to be
 608          * created.
 609          * NOTE: if both tuner and demod have multiple instances, it is up
 610          * to the caller driver to create such links.
 611          */
 612         if (ntuner > 1)
 613                 tuner = NULL;
 614         if (ndemod > 1)
 615                 demod = NULL;
 616
 617         if (create_rf_connector) {
 618                 conn = kzalloc(sizeof(*conn), GFP_KERNEL);
 619                 if (!conn)
 620                         return -ENOMEM;
 621                 adap->conn = conn;
 622
 623                 adap->conn_pads = kzalloc(sizeof(*adap->conn_pads), GFP_KERNEL);
 624                 if (!adap->conn_pads)
 625                         return -ENOMEM;
 626
 627                 conn->flags = MEDIA_ENT_FL_CONNECTOR;
 628                 conn->function = MEDIA_ENT_F_CONN_RF;
 629                 conn->name = connector_name;
 630                 adap->conn_pads->flags = MEDIA_PAD_FL_SOURCE;
 631
 632                 ret = media_entity_pads_init(conn, 1, adap->conn_pads);
 633                 if (ret)
 634                         return ret;
 635
 636                 ret = media_device_register_entity(mdev, conn);
 637                 if (ret)
 638                         return ret;
 639
 640                 if (!ntuner)
 641                         ret = media_create_pad_links(mdev,
 642                                                      MEDIA_ENT_F_CONN_RF,
 643                                                      conn, 0,
 644                                                      MEDIA_ENT_F_DTV_DEMOD,
 645                                                      demod, 0,
 646                                                      MEDIA_LNK_FL_ENABLED,
 647                                                      false);
 648                 else
 649                         ret = media_create_pad_links(mdev,
 650                                                      MEDIA_ENT_F_CONN_RF,
 651                                                      conn, 0,
 652                                                      MEDIA_ENT_F_TUNER,
 653                                                      tuner, TUNER_PAD_RF_INPUT,
 654                                                      MEDIA_LNK_FL_ENABLED,
 655                                                      false);
 656                 if (ret)
 657                         return ret;
 658         }
 659
 660         if (ntuner && ndemod) {
 661                 ret = media_create_pad_links(mdev,
 662                                              MEDIA_ENT_F_TUNER,
 663                                              tuner, TUNER_PAD_OUTPUT,
 664                                              MEDIA_ENT_F_DTV_DEMOD,
 665                                              demod, 0, MEDIA_LNK_FL_ENABLED,
 666                                              false);
 667                 if (ret)
 668                         return ret;
 669         }
 670
 671         if (ndemod && demux) {
 672                 ret = media_create_pad_links(mdev,
 673                                              MEDIA_ENT_F_DTV_DEMOD,
 674                                              demod, 1,
 675                                              MEDIA_ENT_F_TS_DEMUX,
 676                                              demux, 0, MEDIA_LNK_FL_ENABLED,
 677                                              false);
 678                 if (ret)
 679                         return -ENOMEM;
 680         }
 681         if (demux && ca) {
 682                 ret = media_create_pad_link(demux, 1, ca,
 683                                             0, MEDIA_LNK_FL_ENABLED);
 684                 if (ret)
 685                         return -ENOMEM;
 686         }
 687
 688         /* Create demux links for each ringbuffer/pad */
 689         if (demux) {
 690                 media_device_for_each_entity(entity, mdev) {
 691                         if (entity->function == MEDIA_ENT_F_IO_DTV) {
 692                                 if (!strncmp(entity->name, DVR_TSOUT,
 693                                     strlen(DVR_TSOUT))) {
 694                                         ret = media_create_pad_link(demux,
 695                                                                 ++dvr_pad,
 696                                                             entity, 0, 0);
 697                                         if (ret)
 698                                                 return ret;
 699                                 }
 700                                 if (!strncmp(entity->name, DEMUX_TSOUT,
 701                                     strlen(DEMUX_TSOUT))) {
 702                                         ret = media_create_pad_link(demux,
 703                                                               ++demux_pad,
 704                                                             entity, 0, 0);
 705                                         if (ret)
 706                                                 return ret;
 707                                 }
 708                         }
 709                 }
 710         }
 711
 712         /* Create interface links for FE->tuner, DVR->demux and CA->ca */
 713         media_device_for_each_intf(intf, mdev) {
 714                 if (intf->type == MEDIA_INTF_T_DVB_CA && ca) {
 715                         link = media_create_intf_link(ca, intf,
 716                                                       MEDIA_LNK_FL_ENABLED);
 717                         if (!link)
 718                                 return -ENOMEM;
 719                 }
 720
 721                 if (intf->type == MEDIA_INTF_T_DVB_FE && tuner) {
 722                         link = media_create_intf_link(tuner, intf,
 723                                                       MEDIA_LNK_FL_ENABLED);
 724                         if (!link)
 725                                 return -ENOMEM;
 726                 }
 727 #if 0
 728                 /*
 729                  * Indirect link - let's not create yet, as we don't know how
 730                  *                 to handle indirect links, nor if this will
 731                  *                 actually be needed.
 732                  */
 733                 if (intf->type == MEDIA_INTF_T_DVB_DVR && demux) {
 734                         link = media_create_intf_link(demux, intf,
 735                                                       MEDIA_LNK_FL_ENABLED);
 736                         if (!link)
 737                                 return -ENOMEM;
 738                 }
 739 #endif
 740                 if (intf->type == MEDIA_INTF_T_DVB_DVR) {
 741                         ret = dvb_create_io_intf_links(adap, intf, DVR_TSOUT);
 742                         if (ret)
 743                                 return ret;
 744                 }
 745                 if (intf->type == MEDIA_INTF_T_DVB_DEMUX) {
 746                         ret = dvb_create_io_intf_links(adap, intf, DEMUX_TSOUT);
 747                         if (ret)
 748                                 return ret;
 749                 }
 750         }
 751         return 0;
 752 }
 753 EXPORT_SYMBOL_GPL(dvb_create_media_graph);
 754 #endif
 755
 756 static int dvbdev_check_free_adapter_num(int num)
 757 {
 758         struct list_head *entry;
 759         list_for_each(entry, &dvb_adapter_list) {
 760                 struct dvb_adapter *adap;
 761                 adap = list_entry(entry, struct dvb_adapter, list_head);
 762                 if (adap->num == num)
 763                         return 0;
 764         }
 765         return 1;
 766 }
 767
 768 static int dvbdev_get_free_adapter_num (void)
 769 {
 770         int num = 0;
 771
 772         while (num < DVB_MAX_ADAPTERS) {
 773                 if (dvbdev_check_free_adapter_num(num))
 774                         return num;
 775                 num++;
 776         }
 777
 778         return -ENFILE;
 779 }
 780
 781
 782 int dvb_register_adapter(struct dvb_adapter *adap, const char *name,
 783                          struct module *module, struct device *device,
 784                          short *adapter_nums)
 785 {
 786         int i, num;
 787
 788         mutex_lock(&dvbdev_register_lock);
 789
 790         for (i = 0; i < DVB_MAX_ADAPTERS; ++i) {
 791                 num = adapter_nums[i];
 792                 if (num >= 0  &&  num < DVB_MAX_ADAPTERS) {
 793                 /* use the one the driver asked for */
 794                         if (dvbdev_check_free_adapter_num(num))
 795                                 break;
 796                 } else {
 797                         num = dvbdev_get_free_adapter_num();
 798                         break;
 799                 }
 800                 num = -1;
 801         }
 802
 803         if (num < 0) {
 804                 mutex_unlock(&dvbdev_register_lock);
 805                 return -ENFILE;
 806         }
 807
 808         memset (adap, 0, sizeof(struct dvb_adapter));
 809         INIT_LIST_HEAD (&adap->device_list);
 810
 811         printk(KERN_INFO "DVB: registering new adapter (%s)\n", name);
 812
 813         adap->num = num;
 814         adap->name = name;
 815         adap->module = module;
 816         adap->device = device;
 817         adap->mfe_shared = 0;
 818         adap->mfe_dvbdev = NULL;
 819         mutex_init (&adap->mfe_lock);
 820
 821         list_add_tail (&adap->list_head, &dvb_adapter_list);
 822
 823         mutex_unlock(&dvbdev_register_lock);
 824
 825         return num;
 826 }
 827 EXPORT_SYMBOL(dvb_register_adapter);
 828
 829
 830 int dvb_unregister_adapter(struct dvb_adapter *adap)
 831 {
 832         mutex_lock(&dvbdev_register_lock);
 833         list_del (&adap->list_head);
 834         mutex_unlock(&dvbdev_register_lock);
 835         return 0;
 836 }
 837 EXPORT_SYMBOL(dvb_unregister_adapter);
 838
 839 /* if the miracle happens and "generic_usercopy()" is included into
 840    the kernel, then this can vanish. please don't make the mistake and
 841    define this as video_usercopy(). this will introduce a dependecy
 842    to the v4l "videodev.o" module, which is unnecessary for some
 843    cards (ie. the budget dvb-cards don't need the v4l module...) */
 844 int dvb_usercopy(struct file *file,
 845                      unsigned int cmd, unsigned long arg,
 846                      int (*func)(struct file *file,
 847                      unsigned int cmd, void *arg))
 848 {
 849         char    sbuf[128];
 850         void    *mbuf = NULL;
 851         void    *parg = NULL;
 852         int     err  = -EINVAL;
 853
 854         /*  Copy arguments into temp kernel buffer  */
 855         switch (_IOC_DIR(cmd)) {
 856         case _IOC_NONE:
 857                 /*
 858                  * For this command, the pointer is actually an integer
 859                  * argument.
 860                  */
 861                 parg = (void *) arg;
 862                 break;
 863         case _IOC_READ: /* some v4l ioctls are marked wrong ... */
 864         case _IOC_WRITE:
 865         case (_IOC_WRITE | _IOC_READ):
 866                 if (_IOC_SIZE(cmd) <= sizeof(sbuf)) {
 867                         parg = sbuf;
 868                 } else {
 869                         /* too big to allocate from stack */
 870                         mbuf = kmalloc(_IOC_SIZE(cmd), GFP_KERNEL);
 871                         if (NULL == mbuf)
 872                                 return -ENOMEM;
 873                         parg = mbuf;
 874                 }
 875
 876                 err = -EFAULT;
 877                 if (copy_from_user(parg, (void __user *)arg, _IOC_SIZE(cmd)))
 878                         goto out;
 879                 break;
 880         }
 881
 882         /* call driver */
 883         if ((err = func(file, cmd, parg)) == -ENOIOCTLCMD)
 884                 err = -ENOTTY;
 885
 886         if (err < 0)
 887                 goto out;
 888
 889         /*  Copy results into user buffer  */
 890         switch (_IOC_DIR(cmd))
 891         {
 892         case _IOC_READ:
 893         case (_IOC_WRITE | _IOC_READ):
 894                 if (copy_to_user((void __user *)arg, parg, _IOC_SIZE(cmd)))
 895                         err = -EFAULT;
 896                 break;
 897         }
 898
 899 out:
 900         kfree(mbuf);
 901         return err;
 902 }
 903
 904 static int dvb_uevent(struct device *dev, struct kobj_uevent_env *env)
 905 {
 906         struct dvb_device *dvbdev = dev_get_drvdata(dev);
 907
 908         add_uevent_var(env, "DVB_ADAPTER_NUM=%d", dvbdev->adapter->num);
 909         add_uevent_var(env, "DVB_DEVICE_TYPE=%s", dnames[dvbdev->type]);
 910         add_uevent_var(env, "DVB_DEVICE_NUM=%d", dvbdev->id);
 911         return 0;
 912 }
 913
 914 static char *dvb_devnode(struct device *dev, umode_t *mode)
 915 {
 916         struct dvb_device *dvbdev = dev_get_drvdata(dev);
 917
 918         return kasprintf(GFP_KERNEL, "dvb/adapter%d/%s%d",
 919                 dvbdev->adapter->num, dnames[dvbdev->type], dvbdev->id);
 920 }
 921
 922
 923 static int __init init_dvbdev(void)
 924 {
 925         int retval;
 926         dev_t dev = MKDEV(DVB_MAJOR, 0);
 927
 928         if ((retval = register_chrdev_region(dev, MAX_DVB_MINORS, "DVB")) != 0) {
 929                 printk(KERN_ERR "dvb-core: unable to get major %d\n", DVB_MAJOR);
 930                 return retval;
 931         }
 932
 933         cdev_init(&dvb_device_cdev, &dvb_device_fops);
 934         if ((retval = cdev_add(&dvb_device_cdev, dev, MAX_DVB_MINORS)) != 0) {
 935                 printk(KERN_ERR "dvb-core: unable register character device\n");
 936                 goto error;
 937         }
 938
 939         dvb_class = class_create(THIS_MODULE, "dvb");
 940         if (IS_ERR(dvb_class)) {
 941                 retval = PTR_ERR(dvb_class);
 942                 goto error;
 943         }
 944         dvb_class->dev_uevent = dvb_uevent;
 945         dvb_class->devnode = dvb_devnode;
 946         return 0;
 947
 948 error:
 949         cdev_del(&dvb_device_cdev);
 950         unregister_chrdev_region(dev, MAX_DVB_MINORS);
 951         return retval;
 952 }
 953
 954
 955 static void __exit exit_dvbdev(void)
 956 {
 957         class_destroy(dvb_class);
 958         cdev_del(&dvb_device_cdev);
 959         unregister_chrdev_region(MKDEV(DVB_MAJOR, 0), MAX_DVB_MINORS);
 960 }
 961
 962 subsys_initcall(init_dvbdev);
 963 module_exit(exit_dvbdev);
 964
 965 MODULE_DESCRIPTION("DVB Core Driver");
 966 MODULE_AUTHOR("Marcus Metzler, Ralph Metzler, Holger Waechtler");
 967 MODULE_LICENSE("GPL");