drivers/media/dvb-core/dvbdev.c

   1 // SPDX-License-Identifier: LGPL-2.1-or-later
   2 /*
   3  * dvbdev.c
   4  *
   5  * Copyright (C) 2000 Ralph  Metzler <ralph@convergence.de>
   6  *                  & Marcus Metzler <marcus@convergence.de>
   7  *                    for convergence integrated media GmbH
   8  */
   9
  10 #define pr_fmt(fmt) "dvbdev: " fmt
  11
  12 #include <linux/types.h>
  13 #include <linux/errno.h>
  14 #include <linux/string.h>
  15 #include <linux/module.h>
  16 #include <linux/kernel.h>
  17 #include <linux/i2c.h>
  18 #include <linux/init.h>
  19 #include <linux/slab.h>
  20 #include <linux/device.h>
  21 #include <linux/fs.h>
  22 #include <linux/cdev.h>
  23 #include <linux/mutex.h>
  24 #include <media/dvbdev.h>
  25
  26 /* Due to enum tuner_pad_index */
  27 #include <media/tuner.h>
  28
  29 static DEFINE_MUTEX(dvbdev_mutex);
  30 static int dvbdev_debug;
  31
  32 module_param(dvbdev_debug, int, 0644);
  33 MODULE_PARM_DESC(dvbdev_debug, "Turn on/off device debugging (default:off).");
  34
  35 #define dprintk(fmt, arg...) do {                                       \
  36         if (dvbdev_debug)                                               \
  37                 printk(KERN_DEBUG pr_fmt("%s: " fmt),                   \
  38                        __func__, ##arg);                                \
  39 } while (0)
  40
  41 static LIST_HEAD(dvb_adapter_list);
  42 static DEFINE_MUTEX(dvbdev_register_lock);
  43
  44 static const char * const dnames[] = {
  45         [DVB_DEVICE_VIDEO] =            "video",
  46         [DVB_DEVICE_AUDIO] =            "audio",
  47         [DVB_DEVICE_SEC] =              "sec",
  48         [DVB_DEVICE_FRONTEND] =         "frontend",
  49         [DVB_DEVICE_DEMUX] =            "demux",
  50         [DVB_DEVICE_DVR] =              "dvr",
  51         [DVB_DEVICE_CA] =               "ca",
  52         [DVB_DEVICE_NET] =              "net",
  53         [DVB_DEVICE_OSD] =              "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
  62 static const u8 minor_type[] = {
  63        [DVB_DEVICE_VIDEO]      = 0,
  64        [DVB_DEVICE_AUDIO]      = 1,
  65        [DVB_DEVICE_SEC]        = 2,
  66        [DVB_DEVICE_FRONTEND]   = 3,
  67        [DVB_DEVICE_DEMUX]      = 4,
  68        [DVB_DEVICE_DVR]        = 5,
  69        [DVB_DEVICE_CA]         = 6,
  70        [DVB_DEVICE_NET]        = 7,
  71        [DVB_DEVICE_OSD]        = 8,
  72 };
  73
  74 #define nums2minor(num, type, id) \
  75        (((num) << 6) | ((id) << 4) | minor_type[type])
  76
  77 #define MAX_DVB_MINORS          (DVB_MAX_ADAPTERS*64)
  78 #endif
  79
  80 static struct class *dvb_class;
  81
  82 static struct dvb_device *dvb_minors[MAX_DVB_MINORS];
  83 static DECLARE_RWSEM(minor_rwsem);
  84
  85 static int dvb_device_open(struct inode *inode, struct file *file)
  86 {
  87         struct dvb_device *dvbdev;
  88
  89         mutex_lock(&dvbdev_mutex);
  90         down_read(&minor_rwsem);
  91         dvbdev = dvb_minors[iminor(inode)];
  92
  93         if (dvbdev && dvbdev->fops) {
  94                 int err = 0;
  95                 const struct file_operations *new_fops;
  96
  97                 new_fops = fops_get(dvbdev->fops);
  98                 if (!new_fops)
  99                         goto fail;
 100                 file->private_data = dvbdev;
 101                 replace_fops(file, new_fops);
 102                 if (file->f_op->open)
 103                         err = file->f_op->open(inode, file);
 104                 up_read(&minor_rwsem);
 105                 mutex_unlock(&dvbdev_mutex);
 106                 return err;
 107         }
 108 fail:
 109         up_read(&minor_rwsem);
 110         mutex_unlock(&dvbdev_mutex);
 111         return -ENODEV;
 112 }
 113
 114
 115 static const struct file_operations dvb_device_fops =
 116 {
 117         .owner =        THIS_MODULE,
 118         .open =         dvb_device_open,
 119         .llseek =       noop_llseek,
 120 };
 121
 122 static struct cdev dvb_device_cdev;
 123
 124 int dvb_generic_open(struct inode *inode, struct file *file)
 125 {
 126         struct dvb_device *dvbdev = file->private_data;
 127
 128         if (!dvbdev)
 129                 return -ENODEV;
 130
 131         if (!dvbdev->users)
 132                 return -EBUSY;
 133
 134         if ((file->f_flags & O_ACCMODE) == O_RDONLY) {
 135                 if (!dvbdev->readers)
 136                         return -EBUSY;
 137                 dvbdev->readers--;
 138         } else {
 139                 if (!dvbdev->writers)
 140                         return -EBUSY;
 141                 dvbdev->writers--;
 142         }
 143
 144         dvbdev->users--;
 145         return 0;
 146 }
 147 EXPORT_SYMBOL(dvb_generic_open);
 148
 149
 150 int dvb_generic_release(struct inode *inode, struct file *file)
 151 {
 152         struct dvb_device *dvbdev = file->private_data;
 153
 154         if (!dvbdev)
 155                 return -ENODEV;
 156
 157         if ((file->f_flags & O_ACCMODE) == O_RDONLY) {
 158                 dvbdev->readers++;
 159         } else {
 160                 dvbdev->writers++;
 161         }
 162
 163         dvbdev->users++;
 164         return 0;
 165 }
 166 EXPORT_SYMBOL(dvb_generic_release);
 167
 168
 169 long dvb_generic_ioctl(struct file *file,
 170                        unsigned int cmd, unsigned long arg)
 171 {
 172         struct dvb_device *dvbdev = file->private_data;
 173
 174         if (!dvbdev)
 175                 return -ENODEV;
 176
 177         if (!dvbdev->kernel_ioctl)
 178                 return -EINVAL;
 179
 180         return dvb_usercopy(file, cmd, arg, dvbdev->kernel_ioctl);
 181 }
 182 EXPORT_SYMBOL(dvb_generic_ioctl);
 183
 184
 185 static int dvbdev_get_free_id (struct dvb_adapter *adap, int type)
 186 {
 187         u32 id = 0;
 188
 189         while (id < DVB_MAX_IDS) {
 190                 struct dvb_device *dev;
 191                 list_for_each_entry(dev, &adap->device_list, list_head)
 192                         if (dev->type == type && dev->id == id)
 193                                 goto skip;
 194                 return id;
 195 skip:
 196                 id++;
 197         }
 198         return -ENFILE;
 199 }
 200
 201 static void dvb_media_device_free(struct dvb_device *dvbdev)
 202 {
 203 #if defined(CONFIG_MEDIA_CONTROLLER_DVB)
 204         if (dvbdev->entity) {
 205                 media_device_unregister_entity(dvbdev->entity);
 206                 kfree(dvbdev->entity);
 207                 kfree(dvbdev->pads);
 208                 dvbdev->entity = NULL;
 209                 dvbdev->pads = NULL;
 210         }
 211
 212         if (dvbdev->tsout_entity) {
 213                 int i;
 214
 215                 for (i = 0; i < dvbdev->tsout_num_entities; i++) {
 216                         media_device_unregister_entity(&dvbdev->tsout_entity[i]);
 217                         kfree(dvbdev->tsout_entity[i].name);
 218                 }
 219                 kfree(dvbdev->tsout_entity);
 220                 kfree(dvbdev->tsout_pads);
 221                 dvbdev->tsout_entity = NULL;
 222                 dvbdev->tsout_pads = NULL;
 223
 224                 dvbdev->tsout_num_entities = 0;
 225         }
 226
 227         if (dvbdev->intf_devnode) {
 228                 media_devnode_remove(dvbdev->intf_devnode);
 229                 dvbdev->intf_devnode = NULL;
 230         }
 231
 232         if (dvbdev->adapter->conn) {
 233                 media_device_unregister_entity(dvbdev->adapter->conn);
 234                 kfree(dvbdev->adapter->conn);
 235                 dvbdev->adapter->conn = NULL;
 236                 kfree(dvbdev->adapter->conn_pads);
 237                 dvbdev->adapter->conn_pads = NULL;
 238         }
 239 #endif
 240 }
 241
 242 #if defined(CONFIG_MEDIA_CONTROLLER_DVB)
 243 static int dvb_create_tsout_entity(struct dvb_device *dvbdev,
 244                                     const char *name, int npads)
 245 {
 246         int i, ret = 0;
 247
 248         dvbdev->tsout_pads = kcalloc(npads, sizeof(*dvbdev->tsout_pads),
 249                                      GFP_KERNEL);
 250         if (!dvbdev->tsout_pads)
 251                 return -ENOMEM;
 252
 253         dvbdev->tsout_entity = kcalloc(npads, sizeof(*dvbdev->tsout_entity),
 254                                        GFP_KERNEL);
 255         if (!dvbdev->tsout_entity)
 256                 return -ENOMEM;
 257
 258         dvbdev->tsout_num_entities = npads;
 259
 260         for (i = 0; i < npads; i++) {
 261                 struct media_pad *pads = &dvbdev->tsout_pads[i];
 262                 struct media_entity *entity = &dvbdev->tsout_entity[i];
 263
 264                 entity->name = kasprintf(GFP_KERNEL, "%s #%d", name, i);
 265                 if (!entity->name)
 266                         return -ENOMEM;
 267
 268                 entity->function = MEDIA_ENT_F_IO_DTV;
 269                 pads->flags = MEDIA_PAD_FL_SINK;
 270
 271                 ret = media_entity_pads_init(entity, 1, pads);
 272                 if (ret < 0)
 273                         return ret;
 274
 275                 ret = media_device_register_entity(dvbdev->adapter->mdev,
 276                                                    entity);
 277                 if (ret < 0)
 278                         return ret;
 279         }
 280         return 0;
 281 }
 282
 283 #define DEMUX_TSOUT     "demux-tsout"
 284 #define DVR_TSOUT       "dvr-tsout"
 285
 286 static int dvb_create_media_entity(struct dvb_device *dvbdev,
 287                                    int type, int demux_sink_pads)
 288 {
 289         int i, ret, npads;
 290
 291         switch (type) {
 292         case DVB_DEVICE_FRONTEND:
 293                 npads = 2;
 294                 break;
 295         case DVB_DEVICE_DVR:
 296                 ret = dvb_create_tsout_entity(dvbdev, DVR_TSOUT,
 297                                               demux_sink_pads);
 298                 return ret;
 299         case DVB_DEVICE_DEMUX:
 300                 npads = 1 + demux_sink_pads;
 301                 ret = dvb_create_tsout_entity(dvbdev, DEMUX_TSOUT,
 302                                               demux_sink_pads);
 303                 if (ret < 0)
 304                         return ret;
 305                 break;
 306         case DVB_DEVICE_CA:
 307                 npads = 2;
 308                 break;
 309         case DVB_DEVICE_NET:
 310                 /*
 311                  * We should be creating entities for the MPE/ULE
 312                  * decapsulation hardware (or software implementation).
 313                  *
 314                  * However, the number of for the MPE/ULE decaps may not be
 315                  * fixed. As we don't have yet dynamic support for PADs at
 316                  * the Media Controller, let's not create the decap
 317                  * entities yet.
 318                  */
 319                 return 0;
 320         default:
 321                 return 0;
 322         }
 323
 324         dvbdev->entity = kzalloc(sizeof(*dvbdev->entity), GFP_KERNEL);
 325         if (!dvbdev->entity)
 326                 return -ENOMEM;
 327
 328         dvbdev->entity->name = dvbdev->name;
 329
 330         if (npads) {
 331                 dvbdev->pads = kcalloc(npads, sizeof(*dvbdev->pads),
 332                                        GFP_KERNEL);
 333                 if (!dvbdev->pads) {
 334                         kfree(dvbdev->entity);
 335                         return -ENOMEM;
 336                 }
 337         }
 338
 339         switch (type) {
 340         case DVB_DEVICE_FRONTEND:
 341                 dvbdev->entity->function = MEDIA_ENT_F_DTV_DEMOD;
 342                 dvbdev->pads[0].flags = MEDIA_PAD_FL_SINK;
 343                 dvbdev->pads[1].flags = MEDIA_PAD_FL_SOURCE;
 344                 break;
 345         case DVB_DEVICE_DEMUX:
 346                 dvbdev->entity->function = MEDIA_ENT_F_TS_DEMUX;
 347                 dvbdev->pads[0].flags = MEDIA_PAD_FL_SINK;
 348                 for (i = 1; i < npads; i++)
 349                         dvbdev->pads[i].flags = MEDIA_PAD_FL_SOURCE;
 350                 break;
 351         case DVB_DEVICE_CA:
 352                 dvbdev->entity->function = MEDIA_ENT_F_DTV_CA;
 353                 dvbdev->pads[0].flags = MEDIA_PAD_FL_SINK;
 354                 dvbdev->pads[1].flags = MEDIA_PAD_FL_SOURCE;
 355                 break;
 356         default:
 357                 /* Should never happen, as the first switch prevents it */
 358                 kfree(dvbdev->entity);
 359                 kfree(dvbdev->pads);
 360                 dvbdev->entity = NULL;
 361                 dvbdev->pads = NULL;
 362                 return 0;
 363         }
 364
 365         if (npads) {
 366                 ret = media_entity_pads_init(dvbdev->entity, npads, dvbdev->pads);
 367                 if (ret)
 368                         return ret;
 369         }
 370         ret = media_device_register_entity(dvbdev->adapter->mdev,
 371                                            dvbdev->entity);
 372         if (ret)
 373                 return ret;
 374
 375         pr_info("%s: media entity '%s' registered.\n",
 376                 __func__, dvbdev->entity->name);
 377
 378         return 0;
 379 }
 380 #endif
 381
 382 static int dvb_register_media_device(struct dvb_device *dvbdev,
 383                                      int type, int minor,
 384                                      unsigned demux_sink_pads)
 385 {
 386 #if defined(CONFIG_MEDIA_CONTROLLER_DVB)
 387         struct media_link *link;
 388         u32 intf_type;
 389         int ret;
 390
 391         if (!dvbdev->adapter->mdev)
 392                 return 0;
 393
 394         ret = dvb_create_media_entity(dvbdev, type, demux_sink_pads);
 395         if (ret)
 396                 return ret;
 397
 398         switch (type) {
 399         case DVB_DEVICE_FRONTEND:
 400                 intf_type = MEDIA_INTF_T_DVB_FE;
 401                 break;
 402         case DVB_DEVICE_DEMUX:
 403                 intf_type = MEDIA_INTF_T_DVB_DEMUX;
 404                 break;
 405         case DVB_DEVICE_DVR:
 406                 intf_type = MEDIA_INTF_T_DVB_DVR;
 407                 break;
 408         case DVB_DEVICE_CA:
 409                 intf_type = MEDIA_INTF_T_DVB_CA;
 410                 break;
 411         case DVB_DEVICE_NET:
 412                 intf_type = MEDIA_INTF_T_DVB_NET;
 413                 break;
 414         default:
 415                 return 0;
 416         }
 417
 418         dvbdev->intf_devnode = media_devnode_create(dvbdev->adapter->mdev,
 419                                                     intf_type, 0,
 420                                                     DVB_MAJOR, minor);
 421
 422         if (!dvbdev->intf_devnode)
 423                 return -ENOMEM;
 424
 425         /*
 426          * Create the "obvious" link, e. g. the ones that represent
 427          * a direct association between an interface and an entity.
 428          * Other links should be created elsewhere, like:
 429          *              DVB FE intf    -> tuner
 430          *              DVB demux intf -> dvr
 431          */
 432
 433         if (!dvbdev->entity)
 434                 return 0;
 435
 436         link = media_create_intf_link(dvbdev->entity,
 437                                       &dvbdev->intf_devnode->intf,
 438                                       MEDIA_LNK_FL_ENABLED |
 439                                       MEDIA_LNK_FL_IMMUTABLE);
 440         if (!link)
 441                 return -ENOMEM;
 442 #endif
 443         return 0;
 444 }
 445
 446 int dvb_register_device(struct dvb_adapter *adap, struct dvb_device **pdvbdev,
 447                         const struct dvb_device *template, void *priv,
 448                         enum dvb_device_type type, int demux_sink_pads)
 449 {
 450         struct dvb_device *dvbdev;
 451         struct file_operations *dvbdevfops;
 452         struct device *clsdev;
 453         int minor;
 454         int id, ret;
 455
 456         mutex_lock(&dvbdev_register_lock);
 457
 458         if ((id = dvbdev_get_free_id (adap, type)) < 0){
 459                 mutex_unlock(&dvbdev_register_lock);
 460                 *pdvbdev = NULL;
 461                 pr_err("%s: couldn't find free device id\n", __func__);
 462                 return -ENFILE;
 463         }
 464
 465         *pdvbdev = dvbdev = kzalloc(sizeof(*dvbdev), GFP_KERNEL);
 466
 467         if (!dvbdev){
 468                 mutex_unlock(&dvbdev_register_lock);
 469                 return -ENOMEM;
 470         }
 471
 472         dvbdevfops = kmemdup(template->fops, sizeof(*dvbdevfops), GFP_KERNEL);
 473
 474         if (!dvbdevfops){
 475                 kfree (dvbdev);
 476                 mutex_unlock(&dvbdev_register_lock);
 477                 return -ENOMEM;
 478         }
 479
 480         memcpy(dvbdev, template, sizeof(struct dvb_device));
 481         dvbdev->type = type;
 482         dvbdev->id = id;
 483         dvbdev->adapter = adap;
 484         dvbdev->priv = priv;
 485         dvbdev->fops = dvbdevfops;
 486         init_waitqueue_head (&dvbdev->wait_queue);
 487
 488         dvbdevfops->owner = adap->module;
 489
 490         list_add_tail (&dvbdev->list_head, &adap->device_list);
 491
 492         down_write(&minor_rwsem);
 493 #ifdef CONFIG_DVB_DYNAMIC_MINORS
 494         for (minor = 0; minor < MAX_DVB_MINORS; minor++)
 495                 if (dvb_minors[minor] == NULL)
 496                         break;
 497
 498         if (minor == MAX_DVB_MINORS) {
 499                 list_del (&dvbdev->list_head);
 500                 kfree(dvbdevfops);
 501                 kfree(dvbdev);
 502                 up_write(&minor_rwsem);
 503                 mutex_unlock(&dvbdev_register_lock);
 504                 return -EINVAL;
 505         }
 506 #else
 507         minor = nums2minor(adap->num, type, id);
 508 #endif
 509
 510         dvbdev->minor = minor;
 511         dvb_minors[minor] = dvbdev;
 512         up_write(&minor_rwsem);
 513
 514         ret = dvb_register_media_device(dvbdev, type, minor, demux_sink_pads);
 515         if (ret) {
 516                 pr_err("%s: dvb_register_media_device failed to create the mediagraph\n",
 517                       __func__);
 518
 519                 dvb_media_device_free(dvbdev);
 520                 list_del (&dvbdev->list_head);
 521                 kfree(dvbdevfops);
 522                 kfree(dvbdev);
 523                 mutex_unlock(&dvbdev_register_lock);
 524                 return ret;
 525         }
 526
 527         mutex_unlock(&dvbdev_register_lock);
 528
 529         clsdev = device_create(dvb_class, adap->device,
 530                                MKDEV(DVB_MAJOR, minor),
 531                                dvbdev, "dvb%d.%s%d", adap->num, dnames[type], id);
 532         if (IS_ERR(clsdev)) {
 533                 pr_err("%s: failed to create device dvb%d.%s%d (%ld)\n",
 534                        __func__, adap->num, dnames[type], id, PTR_ERR(clsdev));
 535                 dvb_media_device_free(dvbdev);
 536                 list_del (&dvbdev->list_head);
 537                 kfree(dvbdevfops);
 538                 kfree(dvbdev);
 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                                                       MEDIA_LNK_FL_IMMUTABLE);
 603                         if (!link)
 604                                 return -ENOMEM;
 605                 }
 606         }
 607         return 0;
 608 }
 609
 610 int dvb_create_media_graph(struct dvb_adapter *adap,
 611                            bool create_rf_connector)
 612 {
 613         struct media_device *mdev = adap->mdev;
 614         struct media_entity *entity, *tuner = NULL, *demod = NULL, *conn;
 615         struct media_entity *demux = NULL, *ca = NULL;
 616         struct media_link *link;
 617         struct media_interface *intf;
 618         unsigned demux_pad = 0;
 619         unsigned dvr_pad = 0;
 620         unsigned ntuner = 0, ndemod = 0;
 621         int ret, pad_source, pad_sink;
 622         static const char *connector_name = "Television";
 623
 624         if (!mdev)
 625                 return 0;
 626
 627         media_device_for_each_entity(entity, mdev) {
 628                 switch (entity->function) {
 629                 case MEDIA_ENT_F_TUNER:
 630                         tuner = entity;
 631                         ntuner++;
 632                         break;
 633                 case MEDIA_ENT_F_DTV_DEMOD:
 634                         demod = entity;
 635                         ndemod++;
 636                         break;
 637                 case MEDIA_ENT_F_TS_DEMUX:
 638                         demux = entity;
 639                         break;
 640                 case MEDIA_ENT_F_DTV_CA:
 641                         ca = entity;
 642                         break;
 643                 }
 644         }
 645
 646         /*
 647          * Prepare to signalize to media_create_pad_links() that multiple
 648          * entities of the same type exists and a 1:n or n:1 links need to be
 649          * created.
 650          * NOTE: if both tuner and demod have multiple instances, it is up
 651          * to the caller driver to create such links.
 652          */
 653         if (ntuner > 1)
 654                 tuner = NULL;
 655         if (ndemod > 1)
 656                 demod = NULL;
 657
 658         if (create_rf_connector) {
 659                 conn = kzalloc(sizeof(*conn), GFP_KERNEL);
 660                 if (!conn)
 661                         return -ENOMEM;
 662                 adap->conn = conn;
 663
 664                 adap->conn_pads = kzalloc(sizeof(*adap->conn_pads), GFP_KERNEL);
 665                 if (!adap->conn_pads)
 666                         return -ENOMEM;
 667
 668                 conn->flags = MEDIA_ENT_FL_CONNECTOR;
 669                 conn->function = MEDIA_ENT_F_CONN_RF;
 670                 conn->name = connector_name;
 671                 adap->conn_pads->flags = MEDIA_PAD_FL_SOURCE;
 672
 673                 ret = media_entity_pads_init(conn, 1, adap->conn_pads);
 674                 if (ret)
 675                         return ret;
 676
 677                 ret = media_device_register_entity(mdev, conn);
 678                 if (ret)
 679                         return ret;
 680
 681                 if (!ntuner) {
 682                         ret = media_create_pad_links(mdev,
 683                                                      MEDIA_ENT_F_CONN_RF,
 684                                                      conn, 0,
 685                                                      MEDIA_ENT_F_DTV_DEMOD,
 686                                                      demod, 0,
 687                                                      MEDIA_LNK_FL_ENABLED,
 688                                                      false);
 689                 } else {
 690                         pad_sink = media_get_pad_index(tuner, true,
 691                                                        PAD_SIGNAL_ANALOG);
 692                         if (pad_sink < 0)
 693                                 return -EINVAL;
 694                         ret = media_create_pad_links(mdev,
 695                                                      MEDIA_ENT_F_CONN_RF,
 696                                                      conn, 0,
 697                                                      MEDIA_ENT_F_TUNER,
 698                                                      tuner, pad_sink,
 699                                                      MEDIA_LNK_FL_ENABLED,
 700                                                      false);
 701                 }
 702                 if (ret)
 703                         return ret;
 704         }
 705
 706         if (ntuner && ndemod) {
 707                 /* NOTE: first found tuner source pad presumed correct */
 708                 pad_source = media_get_pad_index(tuner, false,
 709                                                  PAD_SIGNAL_ANALOG);
 710                 if (pad_source < 0)
 711                         return -EINVAL;
 712                 ret = media_create_pad_links(mdev,
 713                                              MEDIA_ENT_F_TUNER,
 714                                              tuner, pad_source,
 715                                              MEDIA_ENT_F_DTV_DEMOD,
 716                                              demod, 0, MEDIA_LNK_FL_ENABLED,
 717                                              false);
 718                 if (ret)
 719                         return ret;
 720         }
 721
 722         if (ndemod && demux) {
 723                 ret = media_create_pad_links(mdev,
 724                                              MEDIA_ENT_F_DTV_DEMOD,
 725                                              demod, 1,
 726                                              MEDIA_ENT_F_TS_DEMUX,
 727                                              demux, 0, MEDIA_LNK_FL_ENABLED,
 728                                              false);
 729                 if (ret)
 730                         return ret;
 731         }
 732         if (demux && ca) {
 733                 ret = media_create_pad_link(demux, 1, ca,
 734                                             0, MEDIA_LNK_FL_ENABLED);
 735                 if (ret)
 736                         return ret;
 737         }
 738
 739         /* Create demux links for each ringbuffer/pad */
 740         if (demux) {
 741                 media_device_for_each_entity(entity, mdev) {
 742                         if (entity->function == MEDIA_ENT_F_IO_DTV) {
 743                                 if (!strncmp(entity->name, DVR_TSOUT,
 744                                     strlen(DVR_TSOUT))) {
 745                                         ret = media_create_pad_link(demux,
 746                                                                 ++dvr_pad,
 747                                                             entity, 0, 0);
 748                                         if (ret)
 749                                                 return ret;
 750                                 }
 751                                 if (!strncmp(entity->name, DEMUX_TSOUT,
 752                                     strlen(DEMUX_TSOUT))) {
 753                                         ret = media_create_pad_link(demux,
 754                                                               ++demux_pad,
 755                                                             entity, 0, 0);
 756                                         if (ret)
 757                                                 return ret;
 758                                 }
 759                         }
 760                 }
 761         }
 762
 763         /* Create interface links for FE->tuner, DVR->demux and CA->ca */
 764         media_device_for_each_intf(intf, mdev) {
 765                 if (intf->type == MEDIA_INTF_T_DVB_CA && ca) {
 766                         link = media_create_intf_link(ca, intf,
 767                                                       MEDIA_LNK_FL_ENABLED |
 768                                                       MEDIA_LNK_FL_IMMUTABLE);
 769                         if (!link)
 770                                 return -ENOMEM;
 771                 }
 772
 773                 if (intf->type == MEDIA_INTF_T_DVB_FE && tuner) {
 774                         link = media_create_intf_link(tuner, intf,
 775                                                       MEDIA_LNK_FL_ENABLED |
 776                                                       MEDIA_LNK_FL_IMMUTABLE);
 777                         if (!link)
 778                                 return -ENOMEM;
 779                 }
 780 #if 0
 781                 /*
 782                  * Indirect link - let's not create yet, as we don't know how
 783                  *                 to handle indirect links, nor if this will
 784                  *                 actually be needed.
 785                  */
 786                 if (intf->type == MEDIA_INTF_T_DVB_DVR && demux) {
 787                         link = media_create_intf_link(demux, intf,
 788                                                       MEDIA_LNK_FL_ENABLED |
 789                                                       MEDIA_LNK_FL_IMMUTABLE);
 790                         if (!link)
 791                                 return -ENOMEM;
 792                 }
 793 #endif
 794                 if (intf->type == MEDIA_INTF_T_DVB_DVR) {
 795                         ret = dvb_create_io_intf_links(adap, intf, DVR_TSOUT);
 796                         if (ret)
 797                                 return ret;
 798                 }
 799                 if (intf->type == MEDIA_INTF_T_DVB_DEMUX) {
 800                         ret = dvb_create_io_intf_links(adap, intf, DEMUX_TSOUT);
 801                         if (ret)
 802                                 return ret;
 803                 }
 804         }
 805         return 0;
 806 }
 807 EXPORT_SYMBOL_GPL(dvb_create_media_graph);
 808 #endif
 809
 810 static int dvbdev_check_free_adapter_num(int num)
 811 {
 812         struct list_head *entry;
 813         list_for_each(entry, &dvb_adapter_list) {
 814                 struct dvb_adapter *adap;
 815                 adap = list_entry(entry, struct dvb_adapter, list_head);
 816                 if (adap->num == num)
 817                         return 0;
 818         }
 819         return 1;
 820 }
 821
 822 static int dvbdev_get_free_adapter_num (void)
 823 {
 824         int num = 0;
 825
 826         while (num < DVB_MAX_ADAPTERS) {
 827                 if (dvbdev_check_free_adapter_num(num))
 828                         return num;
 829                 num++;
 830         }
 831
 832         return -ENFILE;
 833 }
 834
 835
 836 int dvb_register_adapter(struct dvb_adapter *adap, const char *name,
 837                          struct module *module, struct device *device,
 838                          short *adapter_nums)
 839 {
 840         int i, num;
 841
 842         mutex_lock(&dvbdev_register_lock);
 843
 844         for (i = 0; i < DVB_MAX_ADAPTERS; ++i) {
 845                 num = adapter_nums[i];
 846                 if (num >= 0  &&  num < DVB_MAX_ADAPTERS) {
 847                 /* use the one the driver asked for */
 848                         if (dvbdev_check_free_adapter_num(num))
 849                                 break;
 850                 } else {
 851                         num = dvbdev_get_free_adapter_num();
 852                         break;
 853                 }
 854                 num = -1;
 855         }
 856
 857         if (num < 0) {
 858                 mutex_unlock(&dvbdev_register_lock);
 859                 return -ENFILE;
 860         }
 861
 862         memset (adap, 0, sizeof(struct dvb_adapter));
 863         INIT_LIST_HEAD (&adap->device_list);
 864
 865         pr_info("DVB: registering new adapter (%s)\n", name);
 866
 867         adap->num = num;
 868         adap->name = name;
 869         adap->module = module;
 870         adap->device = device;
 871         adap->mfe_shared = 0;
 872         adap->mfe_dvbdev = NULL;
 873         mutex_init (&adap->mfe_lock);
 874
 875 #ifdef CONFIG_MEDIA_CONTROLLER_DVB
 876         mutex_init(&adap->mdev_lock);
 877 #endif
 878
 879         list_add_tail (&adap->list_head, &dvb_adapter_list);
 880
 881         mutex_unlock(&dvbdev_register_lock);
 882
 883         return num;
 884 }
 885 EXPORT_SYMBOL(dvb_register_adapter);
 886
 887
 888 int dvb_unregister_adapter(struct dvb_adapter *adap)
 889 {
 890         mutex_lock(&dvbdev_register_lock);
 891         list_del (&adap->list_head);
 892         mutex_unlock(&dvbdev_register_lock);
 893         return 0;
 894 }
 895 EXPORT_SYMBOL(dvb_unregister_adapter);
 896
 897 /* if the miracle happens and "generic_usercopy()" is included into
 898    the kernel, then this can vanish. please don't make the mistake and
 899    define this as video_usercopy(). this will introduce a dependency
 900    to the v4l "videodev.o" module, which is unnecessary for some
 901    cards (ie. the budget dvb-cards don't need the v4l module...) */
 902 int dvb_usercopy(struct file *file,
 903                      unsigned int cmd, unsigned long arg,
 904                      int (*func)(struct file *file,
 905                      unsigned int cmd, void *arg))
 906 {
 907         char    sbuf[128];
 908         void    *mbuf = NULL;
 909         void    *parg = NULL;
 910         int     err  = -EINVAL;
 911
 912         /*  Copy arguments into temp kernel buffer  */
 913         switch (_IOC_DIR(cmd)) {
 914         case _IOC_NONE:
 915                 /*
 916                  * For this command, the pointer is actually an integer
 917                  * argument.
 918                  */
 919                 parg = (void *) arg;
 920                 break;
 921         case _IOC_READ: /* some v4l ioctls are marked wrong ... */
 922         case _IOC_WRITE:
 923         case (_IOC_WRITE | _IOC_READ):
 924                 if (_IOC_SIZE(cmd) <= sizeof(sbuf)) {
 925                         parg = sbuf;
 926                 } else {
 927                         /* too big to allocate from stack */
 928                         mbuf = kmalloc(_IOC_SIZE(cmd), GFP_KERNEL);
 929                         if (NULL == mbuf)
 930                                 return -ENOMEM;
 931                         parg = mbuf;
 932                 }
 933
 934                 err = -EFAULT;
 935                 if (copy_from_user(parg, (void __user *)arg, _IOC_SIZE(cmd)))
 936                         goto out;
 937                 break;
 938         }
 939
 940         /* call driver */
 941         if ((err = func(file, cmd, parg)) == -ENOIOCTLCMD)
 942                 err = -ENOTTY;
 943
 944         if (err < 0)
 945                 goto out;
 946
 947         /*  Copy results into user buffer  */
 948         switch (_IOC_DIR(cmd))
 949         {
 950         case _IOC_READ:
 951         case (_IOC_WRITE | _IOC_READ):
 952                 if (copy_to_user((void __user *)arg, parg, _IOC_SIZE(cmd)))
 953                         err = -EFAULT;
 954                 break;
 955         }
 956
 957 out:
 958         kfree(mbuf);
 959         return err;
 960 }
 961
 962 #if IS_ENABLED(CONFIG_I2C)
 963 struct i2c_client *dvb_module_probe(const char *module_name,
 964                                     const char *name,
 965                                     struct i2c_adapter *adap,
 966                                     unsigned char addr,
 967                                     void *platform_data)
 968 {
 969         struct i2c_client *client;
 970         struct i2c_board_info *board_info;
 971
 972         board_info = kzalloc(sizeof(*board_info), GFP_KERNEL);
 973         if (!board_info)
 974                 return NULL;
 975
 976         if (name)
 977                 strscpy(board_info->type, name, I2C_NAME_SIZE);
 978         else
 979                 strscpy(board_info->type, module_name, I2C_NAME_SIZE);
 980
 981         board_info->addr = addr;
 982         board_info->platform_data = platform_data;
 983         request_module(module_name);
 984         client = i2c_new_client_device(adap, board_info);
 985         if (!i2c_client_has_driver(client)) {
 986                 kfree(board_info);
 987                 return NULL;
 988         }
 989
 990         if (!try_module_get(client->dev.driver->owner)) {
 991                 i2c_unregister_device(client);
 992                 client = NULL;
 993         }
 994
 995         kfree(board_info);
 996         return client;
 997 }
 998 EXPORT_SYMBOL_GPL(dvb_module_probe);
 999
1000 void dvb_module_release(struct i2c_client *client)
1001 {
1002         if (!client)
1003                 return;
1004
1005         module_put(client->dev.driver->owner);
1006         i2c_unregister_device(client);
1007 }
1008 EXPORT_SYMBOL_GPL(dvb_module_release);
1009 #endif
1010
1011 static int dvb_uevent(struct device *dev, struct kobj_uevent_env *env)
1012 {
1013         struct dvb_device *dvbdev = dev_get_drvdata(dev);
1014
1015         add_uevent_var(env, "DVB_ADAPTER_NUM=%d", dvbdev->adapter->num);
1016         add_uevent_var(env, "DVB_DEVICE_TYPE=%s", dnames[dvbdev->type]);
1017         add_uevent_var(env, "DVB_DEVICE_NUM=%d", dvbdev->id);
1018         return 0;
1019 }
1020
1021 static char *dvb_devnode(struct device *dev, umode_t *mode)
1022 {
1023         struct dvb_device *dvbdev = dev_get_drvdata(dev);
1024
1025         return kasprintf(GFP_KERNEL, "dvb/adapter%d/%s%d",
1026                 dvbdev->adapter->num, dnames[dvbdev->type], dvbdev->id);
1027 }
1028
1029
1030 static int __init init_dvbdev(void)
1031 {
1032         int retval;
1033         dev_t dev = MKDEV(DVB_MAJOR, 0);
1034
1035         if ((retval = register_chrdev_region(dev, MAX_DVB_MINORS, "DVB")) != 0) {
1036                 pr_err("dvb-core: unable to get major %d\n", DVB_MAJOR);
1037                 return retval;
1038         }
1039
1040         cdev_init(&dvb_device_cdev, &dvb_device_fops);
1041         if ((retval = cdev_add(&dvb_device_cdev, dev, MAX_DVB_MINORS)) != 0) {
1042                 pr_err("dvb-core: unable register character device\n");
1043                 goto error;
1044         }
1045
1046         dvb_class = class_create(THIS_MODULE, "dvb");
1047         if (IS_ERR(dvb_class)) {
1048                 retval = PTR_ERR(dvb_class);
1049                 goto error;
1050         }
1051         dvb_class->dev_uevent = dvb_uevent;
1052         dvb_class->devnode = dvb_devnode;
1053         return 0;
1054
1055 error:
1056         cdev_del(&dvb_device_cdev);
1057         unregister_chrdev_region(dev, MAX_DVB_MINORS);
1058         return retval;
1059 }
1060
1061
1062 static void __exit exit_dvbdev(void)
1063 {
1064         class_destroy(dvb_class);
1065         cdev_del(&dvb_device_cdev);
1066         unregister_chrdev_region(MKDEV(DVB_MAJOR, 0), MAX_DVB_MINORS);
1067 }
1068
1069 subsys_initcall(init_dvbdev);
1070 module_exit(exit_dvbdev);
1071
1072 MODULE_DESCRIPTION("DVB Core Driver");
1073 MODULE_AUTHOR("Marcus Metzler, Ralph Metzler, Holger Waechtler");
1074 MODULE_LICENSE("GPL");