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 = dvb_device_get(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
 152         dvb_device_put(dvbdev);
 153
 154         return 0;
 155 }
 156 EXPORT_SYMBOL(dvb_generic_release);
 157
 158
 159 long dvb_generic_ioctl(struct file *file,
 160                        unsigned int cmd, unsigned long arg)
 161 {
 162         struct dvb_device *dvbdev = file->private_data;
 163
 164         if (!dvbdev)
 165                 return -ENODEV;
 166
 167         if (!dvbdev->kernel_ioctl)
 168                 return -EINVAL;
 169
 170         return dvb_usercopy(file, cmd, arg, dvbdev->kernel_ioctl);
 171 }
 172 EXPORT_SYMBOL(dvb_generic_ioctl);
 173
 174
 175 static int dvbdev_get_free_id (struct dvb_adapter *adap, int type)
 176 {
 177         u32 id = 0;
 178
 179         while (id < DVB_MAX_IDS) {
 180                 struct dvb_device *dev;
 181                 list_for_each_entry(dev, &adap->device_list, list_head)
 182                         if (dev->type == type && dev->id == id)
 183                                 goto skip;
 184                 return id;
 185 skip:
 186                 id++;
 187         }
 188         return -ENFILE;
 189 }
 190
 191 static void dvb_media_device_free(struct dvb_device *dvbdev)
 192 {
 193 #if defined(CONFIG_MEDIA_CONTROLLER_DVB)
 194         if (dvbdev->entity) {
 195                 media_device_unregister_entity(dvbdev->entity);
 196                 kfree(dvbdev->entity);
 197                 kfree(dvbdev->pads);
 198                 dvbdev->entity = NULL;
 199                 dvbdev->pads = NULL;
 200         }
 201
 202         if (dvbdev->tsout_entity) {
 203                 int i;
 204
 205                 for (i = 0; i < dvbdev->tsout_num_entities; i++) {
 206                         media_device_unregister_entity(&dvbdev->tsout_entity[i]);
 207                         kfree(dvbdev->tsout_entity[i].name);
 208                 }
 209                 kfree(dvbdev->tsout_entity);
 210                 kfree(dvbdev->tsout_pads);
 211                 dvbdev->tsout_entity = NULL;
 212                 dvbdev->tsout_pads = NULL;
 213
 214                 dvbdev->tsout_num_entities = 0;
 215         }
 216
 217         if (dvbdev->intf_devnode) {
 218                 media_devnode_remove(dvbdev->intf_devnode);
 219                 dvbdev->intf_devnode = NULL;
 220         }
 221
 222         if (dvbdev->adapter->conn) {
 223                 media_device_unregister_entity(dvbdev->adapter->conn);
 224                 kfree(dvbdev->adapter->conn);
 225                 dvbdev->adapter->conn = NULL;
 226                 kfree(dvbdev->adapter->conn_pads);
 227                 dvbdev->adapter->conn_pads = NULL;
 228         }
 229 #endif
 230 }
 231
 232 #if defined(CONFIG_MEDIA_CONTROLLER_DVB)
 233 static int dvb_create_tsout_entity(struct dvb_device *dvbdev,
 234                                     const char *name, int npads)
 235 {
 236         int i, ret = 0;
 237
 238         dvbdev->tsout_pads = kcalloc(npads, sizeof(*dvbdev->tsout_pads),
 239                                      GFP_KERNEL);
 240         if (!dvbdev->tsout_pads)
 241                 return -ENOMEM;
 242
 243         dvbdev->tsout_entity = kcalloc(npads, sizeof(*dvbdev->tsout_entity),
 244                                        GFP_KERNEL);
 245         if (!dvbdev->tsout_entity)
 246                 return -ENOMEM;
 247
 248         dvbdev->tsout_num_entities = npads;
 249
 250         for (i = 0; i < npads; i++) {
 251                 struct media_pad *pads = &dvbdev->tsout_pads[i];
 252                 struct media_entity *entity = &dvbdev->tsout_entity[i];
 253
 254                 entity->name = kasprintf(GFP_KERNEL, "%s #%d", name, i);
 255                 if (!entity->name)
 256                         return -ENOMEM;
 257
 258                 entity->function = MEDIA_ENT_F_IO_DTV;
 259                 pads->flags = MEDIA_PAD_FL_SINK;
 260
 261                 ret = media_entity_pads_init(entity, 1, pads);
 262                 if (ret < 0)
 263                         return ret;
 264
 265                 ret = media_device_register_entity(dvbdev->adapter->mdev,
 266                                                    entity);
 267                 if (ret < 0)
 268                         return ret;
 269         }
 270         return 0;
 271 }
 272
 273 #define DEMUX_TSOUT     "demux-tsout"
 274 #define DVR_TSOUT       "dvr-tsout"
 275
 276 static int dvb_create_media_entity(struct dvb_device *dvbdev,
 277                                    int type, int demux_sink_pads)
 278 {
 279         int i, ret, npads;
 280
 281         switch (type) {
 282         case DVB_DEVICE_FRONTEND:
 283                 npads = 2;
 284                 break;
 285         case DVB_DEVICE_DVR:
 286                 ret = dvb_create_tsout_entity(dvbdev, DVR_TSOUT,
 287                                               demux_sink_pads);
 288                 return ret;
 289         case DVB_DEVICE_DEMUX:
 290                 npads = 1 + demux_sink_pads;
 291                 ret = dvb_create_tsout_entity(dvbdev, DEMUX_TSOUT,
 292                                               demux_sink_pads);
 293                 if (ret < 0)
 294                         return ret;
 295                 break;
 296         case DVB_DEVICE_CA:
 297                 npads = 2;
 298                 break;
 299         case DVB_DEVICE_NET:
 300                 /*
 301                  * We should be creating entities for the MPE/ULE
 302                  * decapsulation hardware (or software implementation).
 303                  *
 304                  * However, the number of for the MPE/ULE decaps may not be
 305                  * fixed. As we don't have yet dynamic support for PADs at
 306                  * the Media Controller, let's not create the decap
 307                  * entities yet.
 308                  */
 309                 return 0;
 310         default:
 311                 return 0;
 312         }
 313
 314         dvbdev->entity = kzalloc(sizeof(*dvbdev->entity), GFP_KERNEL);
 315         if (!dvbdev->entity)
 316                 return -ENOMEM;
 317
 318         dvbdev->entity->name = dvbdev->name;
 319
 320         if (npads) {
 321                 dvbdev->pads = kcalloc(npads, sizeof(*dvbdev->pads),
 322                                        GFP_KERNEL);
 323                 if (!dvbdev->pads) {
 324                         kfree(dvbdev->entity);
 325                         dvbdev->entity = NULL;
 326                         return -ENOMEM;
 327                 }
 328         }
 329
 330         switch (type) {
 331         case DVB_DEVICE_FRONTEND:
 332                 dvbdev->entity->function = MEDIA_ENT_F_DTV_DEMOD;
 333                 dvbdev->pads[0].flags = MEDIA_PAD_FL_SINK;
 334                 dvbdev->pads[1].flags = MEDIA_PAD_FL_SOURCE;
 335                 break;
 336         case DVB_DEVICE_DEMUX:
 337                 dvbdev->entity->function = MEDIA_ENT_F_TS_DEMUX;
 338                 dvbdev->pads[0].flags = MEDIA_PAD_FL_SINK;
 339                 for (i = 1; i < npads; i++)
 340                         dvbdev->pads[i].flags = MEDIA_PAD_FL_SOURCE;
 341                 break;
 342         case DVB_DEVICE_CA:
 343                 dvbdev->entity->function = MEDIA_ENT_F_DTV_CA;
 344                 dvbdev->pads[0].flags = MEDIA_PAD_FL_SINK;
 345                 dvbdev->pads[1].flags = MEDIA_PAD_FL_SOURCE;
 346                 break;
 347         default:
 348                 /* Should never happen, as the first switch prevents it */
 349                 kfree(dvbdev->entity);
 350                 kfree(dvbdev->pads);
 351                 dvbdev->entity = NULL;
 352                 dvbdev->pads = NULL;
 353                 return 0;
 354         }
 355
 356         if (npads) {
 357                 ret = media_entity_pads_init(dvbdev->entity, npads, dvbdev->pads);
 358                 if (ret)
 359                         return ret;
 360         }
 361         ret = media_device_register_entity(dvbdev->adapter->mdev,
 362                                            dvbdev->entity);
 363         if (ret)
 364                 return ret;
 365
 366         pr_info("%s: media entity '%s' registered.\n",
 367                 __func__, dvbdev->entity->name);
 368
 369         return 0;
 370 }
 371 #endif
 372
 373 static int dvb_register_media_device(struct dvb_device *dvbdev,
 374                                      int type, int minor,
 375                                      unsigned demux_sink_pads)
 376 {
 377 #if defined(CONFIG_MEDIA_CONTROLLER_DVB)
 378         struct media_link *link;
 379         u32 intf_type;
 380         int ret;
 381
 382         if (!dvbdev->adapter->mdev)
 383                 return 0;
 384
 385         ret = dvb_create_media_entity(dvbdev, type, demux_sink_pads);
 386         if (ret)
 387                 return ret;
 388
 389         switch (type) {
 390         case DVB_DEVICE_FRONTEND:
 391                 intf_type = MEDIA_INTF_T_DVB_FE;
 392                 break;
 393         case DVB_DEVICE_DEMUX:
 394                 intf_type = MEDIA_INTF_T_DVB_DEMUX;
 395                 break;
 396         case DVB_DEVICE_DVR:
 397                 intf_type = MEDIA_INTF_T_DVB_DVR;
 398                 break;
 399         case DVB_DEVICE_CA:
 400                 intf_type = MEDIA_INTF_T_DVB_CA;
 401                 break;
 402         case DVB_DEVICE_NET:
 403                 intf_type = MEDIA_INTF_T_DVB_NET;
 404                 break;
 405         default:
 406                 return 0;
 407         }
 408
 409         dvbdev->intf_devnode = media_devnode_create(dvbdev->adapter->mdev,
 410                                                     intf_type, 0,
 411                                                     DVB_MAJOR, minor);
 412
 413         if (!dvbdev->intf_devnode)
 414                 return -ENOMEM;
 415
 416         /*
 417          * Create the "obvious" link, e. g. the ones that represent
 418          * a direct association between an interface and an entity.
 419          * Other links should be created elsewhere, like:
 420          *              DVB FE intf    -> tuner
 421          *              DVB demux intf -> dvr
 422          */
 423
 424         if (!dvbdev->entity)
 425                 return 0;
 426
 427         link = media_create_intf_link(dvbdev->entity, &dvbdev->intf_devnode->intf,
 428                                       MEDIA_LNK_FL_ENABLED);
 429         if (!link)
 430                 return -ENOMEM;
 431 #endif
 432         return 0;
 433 }
 434
 435 int dvb_register_device(struct dvb_adapter *adap, struct dvb_device **pdvbdev,
 436                         const struct dvb_device *template, void *priv, int type,
 437                         int demux_sink_pads)
 438 {
 439         struct dvb_device *dvbdev;
 440         struct file_operations *dvbdevfops;
 441         struct device *clsdev;
 442         int minor;
 443         int id, ret;
 444
 445         mutex_lock(&dvbdev_register_lock);
 446
 447         if ((id = dvbdev_get_free_id (adap, type)) < 0){
 448                 mutex_unlock(&dvbdev_register_lock);
 449                 *pdvbdev = NULL;
 450                 pr_err("%s: couldn't find free device id\n", __func__);
 451                 return -ENFILE;
 452         }
 453
 454         *pdvbdev = dvbdev = kzalloc(sizeof(*dvbdev), GFP_KERNEL);
 455
 456         if (!dvbdev){
 457                 mutex_unlock(&dvbdev_register_lock);
 458                 return -ENOMEM;
 459         }
 460
 461         dvbdevfops = kzalloc(sizeof(struct file_operations), GFP_KERNEL);
 462
 463         if (!dvbdevfops){
 464                 kfree (dvbdev);
 465                 mutex_unlock(&dvbdev_register_lock);
 466                 return -ENOMEM;
 467         }
 468
 469         memcpy(dvbdev, template, sizeof(struct dvb_device));
 470         kref_init(&dvbdev->ref);
 471         dvbdev->type = type;
 472         dvbdev->id = id;
 473         dvbdev->adapter = adap;
 474         dvbdev->priv = priv;
 475         dvbdev->fops = dvbdevfops;
 476         init_waitqueue_head (&dvbdev->wait_queue);
 477
 478         memcpy(dvbdevfops, template->fops, sizeof(struct file_operations));
 479         dvbdevfops->owner = adap->module;
 480
 481         list_add_tail (&dvbdev->list_head, &adap->device_list);
 482
 483         down_write(&minor_rwsem);
 484 #ifdef CONFIG_DVB_DYNAMIC_MINORS
 485         for (minor = 0; minor < MAX_DVB_MINORS; minor++)
 486                 if (dvb_minors[minor] == NULL)
 487                         break;
 488
 489         if (minor == MAX_DVB_MINORS) {
 490                 kfree(dvbdevfops);
 491                 kfree(dvbdev);
 492                 up_write(&minor_rwsem);
 493                 mutex_unlock(&dvbdev_register_lock);
 494                 return -EINVAL;
 495         }
 496 #else
 497         minor = nums2minor(adap->num, type, id);
 498 #endif
 499
 500         dvbdev->minor = minor;
 501         dvb_minors[minor] = dvb_device_get(dvbdev);
 502         up_write(&minor_rwsem);
 503
 504         ret = dvb_register_media_device(dvbdev, type, minor, demux_sink_pads);
 505         if (ret) {
 506                 pr_err("%s: dvb_register_media_device failed to create the mediagraph\n",
 507                       __func__);
 508
 509                 dvb_media_device_free(dvbdev);
 510                 kfree(dvbdevfops);
 511                 kfree(dvbdev);
 512                 up_write(&minor_rwsem);
 513                 mutex_unlock(&dvbdev_register_lock);
 514                 return ret;
 515         }
 516
 517         mutex_unlock(&dvbdev_register_lock);
 518
 519         clsdev = device_create(dvb_class, adap->device,
 520                                MKDEV(DVB_MAJOR, minor),
 521                                dvbdev, "dvb%d.%s%d", adap->num, dnames[type], id);
 522         if (IS_ERR(clsdev)) {
 523                 pr_err("%s: failed to create device dvb%d.%s%d (%ld)\n",
 524                        __func__, adap->num, dnames[type], id, PTR_ERR(clsdev));
 525                 return PTR_ERR(clsdev);
 526         }
 527         dprintk("DVB: register adapter%d/%s%d @ minor: %i (0x%02x)\n",
 528                 adap->num, dnames[type], id, minor, minor);
 529
 530         return 0;
 531 }
 532 EXPORT_SYMBOL(dvb_register_device);
 533
 534
 535 void dvb_remove_device(struct dvb_device *dvbdev)
 536 {
 537         if (!dvbdev)
 538                 return;
 539
 540         down_write(&minor_rwsem);
 541         dvb_minors[dvbdev->minor] = NULL;
 542         dvb_device_put(dvbdev);
 543         up_write(&minor_rwsem);
 544
 545         dvb_media_device_free(dvbdev);
 546
 547         device_destroy(dvb_class, MKDEV(DVB_MAJOR, dvbdev->minor));
 548
 549         list_del (&dvbdev->list_head);
 550 }
 551 EXPORT_SYMBOL(dvb_remove_device);
 552
 553
 554 static void dvb_free_device(struct kref *ref)
 555 {
 556         struct dvb_device *dvbdev = container_of(ref, struct dvb_device, ref);
 557
 558         kfree (dvbdev->fops);
 559         kfree (dvbdev);
 560 }
 561
 562
 563 struct dvb_device *dvb_device_get(struct dvb_device *dvbdev)
 564 {
 565         kref_get(&dvbdev->ref);
 566         return dvbdev;
 567 }
 568 EXPORT_SYMBOL(dvb_device_get);
 569
 570
 571 void dvb_device_put(struct dvb_device *dvbdev)
 572 {
 573         if (dvbdev)
 574                 kref_put(&dvbdev->ref, dvb_free_device);
 575 }
 576
 577
 578 void dvb_unregister_device(struct dvb_device *dvbdev)
 579 {
 580         dvb_remove_device(dvbdev);
 581         dvb_device_put(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");