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 = dvb_device_get(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
 165         dvb_device_put(dvbdev);
 166
 167         return 0;
 168 }
 169 EXPORT_SYMBOL(dvb_generic_release);
 170
 171
 172 long dvb_generic_ioctl(struct file *file,
 173                        unsigned int cmd, unsigned long arg)
 174 {
 175         struct dvb_device *dvbdev = file->private_data;
 176
 177         if (!dvbdev)
 178                 return -ENODEV;
 179
 180         if (!dvbdev->kernel_ioctl)
 181                 return -EINVAL;
 182
 183         return dvb_usercopy(file, cmd, arg, dvbdev->kernel_ioctl);
 184 }
 185 EXPORT_SYMBOL(dvb_generic_ioctl);
 186
 187
 188 static int dvbdev_get_free_id (struct dvb_adapter *adap, int type)
 189 {
 190         u32 id = 0;
 191
 192         while (id < DVB_MAX_IDS) {
 193                 struct dvb_device *dev;
 194                 list_for_each_entry(dev, &adap->device_list, list_head)
 195                         if (dev->type == type && dev->id == id)
 196                                 goto skip;
 197                 return id;
 198 skip:
 199                 id++;
 200         }
 201         return -ENFILE;
 202 }
 203
 204 static void dvb_media_device_free(struct dvb_device *dvbdev)
 205 {
 206 #if defined(CONFIG_MEDIA_CONTROLLER_DVB)
 207         if (dvbdev->entity) {
 208                 media_device_unregister_entity(dvbdev->entity);
 209                 kfree(dvbdev->entity);
 210                 kfree(dvbdev->pads);
 211                 dvbdev->entity = NULL;
 212                 dvbdev->pads = NULL;
 213         }
 214
 215         if (dvbdev->tsout_entity) {
 216                 int i;
 217
 218                 for (i = 0; i < dvbdev->tsout_num_entities; i++) {
 219                         media_device_unregister_entity(&dvbdev->tsout_entity[i]);
 220                         kfree(dvbdev->tsout_entity[i].name);
 221                 }
 222                 kfree(dvbdev->tsout_entity);
 223                 kfree(dvbdev->tsout_pads);
 224                 dvbdev->tsout_entity = NULL;
 225                 dvbdev->tsout_pads = NULL;
 226
 227                 dvbdev->tsout_num_entities = 0;
 228         }
 229
 230         if (dvbdev->intf_devnode) {
 231                 media_devnode_remove(dvbdev->intf_devnode);
 232                 dvbdev->intf_devnode = NULL;
 233         }
 234
 235         if (dvbdev->adapter->conn) {
 236                 media_device_unregister_entity(dvbdev->adapter->conn);
 237                 kfree(dvbdev->adapter->conn);
 238                 dvbdev->adapter->conn = NULL;
 239                 kfree(dvbdev->adapter->conn_pads);
 240                 dvbdev->adapter->conn_pads = NULL;
 241         }
 242 #endif
 243 }
 244
 245 #if defined(CONFIG_MEDIA_CONTROLLER_DVB)
 246 static int dvb_create_tsout_entity(struct dvb_device *dvbdev,
 247                                     const char *name, int npads)
 248 {
 249         int i;
 250
 251         dvbdev->tsout_pads = kcalloc(npads, sizeof(*dvbdev->tsout_pads),
 252                                      GFP_KERNEL);
 253         if (!dvbdev->tsout_pads)
 254                 return -ENOMEM;
 255
 256         dvbdev->tsout_entity = kcalloc(npads, sizeof(*dvbdev->tsout_entity),
 257                                        GFP_KERNEL);
 258         if (!dvbdev->tsout_entity)
 259                 return -ENOMEM;
 260
 261         dvbdev->tsout_num_entities = npads;
 262
 263         for (i = 0; i < npads; i++) {
 264                 struct media_pad *pads = &dvbdev->tsout_pads[i];
 265                 struct media_entity *entity = &dvbdev->tsout_entity[i];
 266                 int ret;
 267
 268                 entity->name = kasprintf(GFP_KERNEL, "%s #%d", name, i);
 269                 if (!entity->name)
 270                         return -ENOMEM;
 271
 272                 entity->function = MEDIA_ENT_F_IO_DTV;
 273                 pads->flags = MEDIA_PAD_FL_SINK;
 274
 275                 ret = media_entity_pads_init(entity, 1, pads);
 276                 if (ret < 0)
 277                         return ret;
 278
 279                 ret = media_device_register_entity(dvbdev->adapter->mdev,
 280                                                    entity);
 281                 if (ret < 0)
 282                         return ret;
 283         }
 284         return 0;
 285 }
 286
 287 #define DEMUX_TSOUT     "demux-tsout"
 288 #define DVR_TSOUT       "dvr-tsout"
 289
 290 static int dvb_create_media_entity(struct dvb_device *dvbdev,
 291                                    int type, int demux_sink_pads)
 292 {
 293         int i, ret, npads;
 294
 295         switch (type) {
 296         case DVB_DEVICE_FRONTEND:
 297                 npads = 2;
 298                 break;
 299         case DVB_DEVICE_DVR:
 300                 ret = dvb_create_tsout_entity(dvbdev, DVR_TSOUT,
 301                                               demux_sink_pads);
 302                 return ret;
 303         case DVB_DEVICE_DEMUX:
 304                 npads = 1 + demux_sink_pads;
 305                 ret = dvb_create_tsout_entity(dvbdev, DEMUX_TSOUT,
 306                                               demux_sink_pads);
 307                 if (ret < 0)
 308                         return ret;
 309                 break;
 310         case DVB_DEVICE_CA:
 311                 npads = 2;
 312                 break;
 313         case DVB_DEVICE_NET:
 314                 /*
 315                  * We should be creating entities for the MPE/ULE
 316                  * decapsulation hardware (or software implementation).
 317                  *
 318                  * However, the number of for the MPE/ULE decaps may not be
 319                  * fixed. As we don't have yet dynamic support for PADs at
 320                  * the Media Controller, let's not create the decap
 321                  * entities yet.
 322                  */
 323                 return 0;
 324         default:
 325                 return 0;
 326         }
 327
 328         dvbdev->entity = kzalloc(sizeof(*dvbdev->entity), GFP_KERNEL);
 329         if (!dvbdev->entity)
 330                 return -ENOMEM;
 331
 332         dvbdev->entity->name = dvbdev->name;
 333
 334         if (npads) {
 335                 dvbdev->pads = kcalloc(npads, sizeof(*dvbdev->pads),
 336                                        GFP_KERNEL);
 337                 if (!dvbdev->pads) {
 338                         kfree(dvbdev->entity);
 339                         dvbdev->entity = NULL;
 340                         return -ENOMEM;
 341                 }
 342         }
 343
 344         switch (type) {
 345         case DVB_DEVICE_FRONTEND:
 346                 dvbdev->entity->function = MEDIA_ENT_F_DTV_DEMOD;
 347                 dvbdev->pads[0].flags = MEDIA_PAD_FL_SINK;
 348                 dvbdev->pads[1].flags = MEDIA_PAD_FL_SOURCE;
 349                 break;
 350         case DVB_DEVICE_DEMUX:
 351                 dvbdev->entity->function = MEDIA_ENT_F_TS_DEMUX;
 352                 dvbdev->pads[0].flags = MEDIA_PAD_FL_SINK;
 353                 for (i = 1; i < npads; i++)
 354                         dvbdev->pads[i].flags = MEDIA_PAD_FL_SOURCE;
 355                 break;
 356         case DVB_DEVICE_CA:
 357                 dvbdev->entity->function = MEDIA_ENT_F_DTV_CA;
 358                 dvbdev->pads[0].flags = MEDIA_PAD_FL_SINK;
 359                 dvbdev->pads[1].flags = MEDIA_PAD_FL_SOURCE;
 360                 break;
 361         default:
 362                 /* Should never happen, as the first switch prevents it */
 363                 kfree(dvbdev->entity);
 364                 kfree(dvbdev->pads);
 365                 dvbdev->entity = NULL;
 366                 dvbdev->pads = NULL;
 367                 return 0;
 368         }
 369
 370         if (npads) {
 371                 ret = media_entity_pads_init(dvbdev->entity, npads, dvbdev->pads);
 372                 if (ret)
 373                         return ret;
 374         }
 375         ret = media_device_register_entity(dvbdev->adapter->mdev,
 376                                            dvbdev->entity);
 377         if (ret)
 378                 return ret;
 379
 380         pr_info("%s: media entity '%s' registered.\n",
 381                 __func__, dvbdev->entity->name);
 382
 383         return 0;
 384 }
 385 #endif
 386
 387 static int dvb_register_media_device(struct dvb_device *dvbdev,
 388                                      int type, int minor,
 389                                      unsigned demux_sink_pads)
 390 {
 391 #if defined(CONFIG_MEDIA_CONTROLLER_DVB)
 392         struct media_link *link;
 393         u32 intf_type;
 394         int ret;
 395
 396         if (!dvbdev->adapter->mdev)
 397                 return 0;
 398
 399         ret = dvb_create_media_entity(dvbdev, type, demux_sink_pads);
 400         if (ret)
 401                 return ret;
 402
 403         switch (type) {
 404         case DVB_DEVICE_FRONTEND:
 405                 intf_type = MEDIA_INTF_T_DVB_FE;
 406                 break;
 407         case DVB_DEVICE_DEMUX:
 408                 intf_type = MEDIA_INTF_T_DVB_DEMUX;
 409                 break;
 410         case DVB_DEVICE_DVR:
 411                 intf_type = MEDIA_INTF_T_DVB_DVR;
 412                 break;
 413         case DVB_DEVICE_CA:
 414                 intf_type = MEDIA_INTF_T_DVB_CA;
 415                 break;
 416         case DVB_DEVICE_NET:
 417                 intf_type = MEDIA_INTF_T_DVB_NET;
 418                 break;
 419         default:
 420                 return 0;
 421         }
 422
 423         dvbdev->intf_devnode = media_devnode_create(dvbdev->adapter->mdev,
 424                                                     intf_type, 0,
 425                                                     DVB_MAJOR, minor);
 426
 427         if (!dvbdev->intf_devnode)
 428                 return -ENOMEM;
 429
 430         /*
 431          * Create the "obvious" link, e. g. the ones that represent
 432          * a direct association between an interface and an entity.
 433          * Other links should be created elsewhere, like:
 434          *              DVB FE intf    -> tuner
 435          *              DVB demux intf -> dvr
 436          */
 437
 438         if (!dvbdev->entity)
 439                 return 0;
 440
 441         link = media_create_intf_link(dvbdev->entity,
 442                                       &dvbdev->intf_devnode->intf,
 443                                       MEDIA_LNK_FL_ENABLED |
 444                                       MEDIA_LNK_FL_IMMUTABLE);
 445         if (!link)
 446                 return -ENOMEM;
 447 #endif
 448         return 0;
 449 }
 450
 451 int dvb_register_device(struct dvb_adapter *adap, struct dvb_device **pdvbdev,
 452                         const struct dvb_device *template, void *priv,
 453                         enum dvb_device_type type, int demux_sink_pads)
 454 {
 455         struct dvb_device *dvbdev;
 456         struct file_operations *dvbdevfops;
 457         struct device *clsdev;
 458         int minor;
 459         int id, ret;
 460
 461         mutex_lock(&dvbdev_register_lock);
 462
 463         if ((id = dvbdev_get_free_id (adap, type)) < 0){
 464                 mutex_unlock(&dvbdev_register_lock);
 465                 *pdvbdev = NULL;
 466                 pr_err("%s: couldn't find free device id\n", __func__);
 467                 return -ENFILE;
 468         }
 469
 470         *pdvbdev = dvbdev = kzalloc(sizeof(*dvbdev), GFP_KERNEL);
 471
 472         if (!dvbdev){
 473                 mutex_unlock(&dvbdev_register_lock);
 474                 return -ENOMEM;
 475         }
 476
 477         dvbdevfops = kmemdup(template->fops, sizeof(*dvbdevfops), GFP_KERNEL);
 478
 479         if (!dvbdevfops){
 480                 kfree (dvbdev);
 481                 mutex_unlock(&dvbdev_register_lock);
 482                 return -ENOMEM;
 483         }
 484
 485         memcpy(dvbdev, template, sizeof(struct dvb_device));
 486         kref_init(&dvbdev->ref);
 487         dvbdev->type = type;
 488         dvbdev->id = id;
 489         dvbdev->adapter = adap;
 490         dvbdev->priv = priv;
 491         dvbdev->fops = dvbdevfops;
 492         init_waitqueue_head (&dvbdev->wait_queue);
 493
 494         dvbdevfops->owner = adap->module;
 495
 496         list_add_tail (&dvbdev->list_head, &adap->device_list);
 497
 498         down_write(&minor_rwsem);
 499 #ifdef CONFIG_DVB_DYNAMIC_MINORS
 500         for (minor = 0; minor < MAX_DVB_MINORS; minor++)
 501                 if (dvb_minors[minor] == NULL)
 502                         break;
 503
 504         if (minor == MAX_DVB_MINORS) {
 505                 list_del (&dvbdev->list_head);
 506                 kfree(dvbdevfops);
 507                 kfree(dvbdev);
 508                 up_write(&minor_rwsem);
 509                 mutex_unlock(&dvbdev_register_lock);
 510                 return -EINVAL;
 511         }
 512 #else
 513         minor = nums2minor(adap->num, type, id);
 514 #endif
 515
 516         dvbdev->minor = minor;
 517         dvb_minors[minor] = dvb_device_get(dvbdev);
 518         up_write(&minor_rwsem);
 519
 520         ret = dvb_register_media_device(dvbdev, type, minor, demux_sink_pads);
 521         if (ret) {
 522                 pr_err("%s: dvb_register_media_device failed to create the mediagraph\n",
 523                       __func__);
 524
 525                 dvb_media_device_free(dvbdev);
 526                 list_del (&dvbdev->list_head);
 527                 kfree(dvbdevfops);
 528                 kfree(dvbdev);
 529                 mutex_unlock(&dvbdev_register_lock);
 530                 return ret;
 531         }
 532
 533         mutex_unlock(&dvbdev_register_lock);
 534
 535         clsdev = device_create(dvb_class, adap->device,
 536                                MKDEV(DVB_MAJOR, minor),
 537                                dvbdev, "dvb%d.%s%d", adap->num, dnames[type], id);
 538         if (IS_ERR(clsdev)) {
 539                 pr_err("%s: failed to create device dvb%d.%s%d (%ld)\n",
 540                        __func__, adap->num, dnames[type], id, PTR_ERR(clsdev));
 541                 dvb_media_device_free(dvbdev);
 542                 list_del (&dvbdev->list_head);
 543                 kfree(dvbdevfops);
 544                 kfree(dvbdev);
 545                 return PTR_ERR(clsdev);
 546         }
 547         dprintk("DVB: register adapter%d/%s%d @ minor: %i (0x%02x)\n",
 548                 adap->num, dnames[type], id, minor, minor);
 549
 550         return 0;
 551 }
 552 EXPORT_SYMBOL(dvb_register_device);
 553
 554
 555 void dvb_remove_device(struct dvb_device *dvbdev)
 556 {
 557         if (!dvbdev)
 558                 return;
 559
 560         down_write(&minor_rwsem);
 561         dvb_minors[dvbdev->minor] = NULL;
 562         dvb_device_put(dvbdev);
 563         up_write(&minor_rwsem);
 564
 565         dvb_media_device_free(dvbdev);
 566
 567         device_destroy(dvb_class, MKDEV(DVB_MAJOR, dvbdev->minor));
 568
 569         list_del (&dvbdev->list_head);
 570 }
 571 EXPORT_SYMBOL(dvb_remove_device);
 572
 573
 574 static void dvb_free_device(struct kref *ref)
 575 {
 576         struct dvb_device *dvbdev = container_of(ref, struct dvb_device, ref);
 577
 578         kfree (dvbdev->fops);
 579         kfree (dvbdev);
 580 }
 581
 582
 583 struct dvb_device *dvb_device_get(struct dvb_device *dvbdev)
 584 {
 585         kref_get(&dvbdev->ref);
 586         return dvbdev;
 587 }
 588 EXPORT_SYMBOL(dvb_device_get);
 589
 590
 591 void dvb_device_put(struct dvb_device *dvbdev)
 592 {
 593         if (dvbdev)
 594                 kref_put(&dvbdev->ref, dvb_free_device);
 595 }
 596
 597
 598 void dvb_unregister_device(struct dvb_device *dvbdev)
 599 {
 600         dvb_remove_device(dvbdev);
 601         dvb_device_put(dvbdev);
 602 }
 603 EXPORT_SYMBOL(dvb_unregister_device);
 604
 605
 606 #ifdef CONFIG_MEDIA_CONTROLLER_DVB
 607
 608 static int dvb_create_io_intf_links(struct dvb_adapter *adap,
 609                                     struct media_interface *intf,
 610                                     char *name)
 611 {
 612         struct media_device *mdev = adap->mdev;
 613         struct media_entity *entity;
 614         struct media_link *link;
 615
 616         media_device_for_each_entity(entity, mdev) {
 617                 if (entity->function == MEDIA_ENT_F_IO_DTV) {
 618                         if (strncmp(entity->name, name, strlen(name)))
 619                                 continue;
 620                         link = media_create_intf_link(entity, intf,
 621                                                       MEDIA_LNK_FL_ENABLED |
 622                                                       MEDIA_LNK_FL_IMMUTABLE);
 623                         if (!link)
 624                                 return -ENOMEM;
 625                 }
 626         }
 627         return 0;
 628 }
 629
 630 int dvb_create_media_graph(struct dvb_adapter *adap,
 631                            bool create_rf_connector)
 632 {
 633         struct media_device *mdev = adap->mdev;
 634         struct media_entity *entity, *tuner = NULL, *demod = NULL, *conn;
 635         struct media_entity *demux = NULL, *ca = NULL;
 636         struct media_link *link;
 637         struct media_interface *intf;
 638         unsigned demux_pad = 0;
 639         unsigned dvr_pad = 0;
 640         unsigned ntuner = 0, ndemod = 0;
 641         int ret, pad_source, pad_sink;
 642         static const char *connector_name = "Television";
 643
 644         if (!mdev)
 645                 return 0;
 646
 647         media_device_for_each_entity(entity, mdev) {
 648                 switch (entity->function) {
 649                 case MEDIA_ENT_F_TUNER:
 650                         tuner = entity;
 651                         ntuner++;
 652                         break;
 653                 case MEDIA_ENT_F_DTV_DEMOD:
 654                         demod = entity;
 655                         ndemod++;
 656                         break;
 657                 case MEDIA_ENT_F_TS_DEMUX:
 658                         demux = entity;
 659                         break;
 660                 case MEDIA_ENT_F_DTV_CA:
 661                         ca = entity;
 662                         break;
 663                 }
 664         }
 665
 666         /*
 667          * Prepare to signalize to media_create_pad_links() that multiple
 668          * entities of the same type exists and a 1:n or n:1 links need to be
 669          * created.
 670          * NOTE: if both tuner and demod have multiple instances, it is up
 671          * to the caller driver to create such links.
 672          */
 673         if (ntuner > 1)
 674                 tuner = NULL;
 675         if (ndemod > 1)
 676                 demod = NULL;
 677
 678         if (create_rf_connector) {
 679                 conn = kzalloc(sizeof(*conn), GFP_KERNEL);
 680                 if (!conn)
 681                         return -ENOMEM;
 682                 adap->conn = conn;
 683
 684                 adap->conn_pads = kzalloc(sizeof(*adap->conn_pads), GFP_KERNEL);
 685                 if (!adap->conn_pads)
 686                         return -ENOMEM;
 687
 688                 conn->flags = MEDIA_ENT_FL_CONNECTOR;
 689                 conn->function = MEDIA_ENT_F_CONN_RF;
 690                 conn->name = connector_name;
 691                 adap->conn_pads->flags = MEDIA_PAD_FL_SOURCE;
 692
 693                 ret = media_entity_pads_init(conn, 1, adap->conn_pads);
 694                 if (ret)
 695                         return ret;
 696
 697                 ret = media_device_register_entity(mdev, conn);
 698                 if (ret)
 699                         return ret;
 700
 701                 if (!ntuner) {
 702                         ret = media_create_pad_links(mdev,
 703                                                      MEDIA_ENT_F_CONN_RF,
 704                                                      conn, 0,
 705                                                      MEDIA_ENT_F_DTV_DEMOD,
 706                                                      demod, 0,
 707                                                      MEDIA_LNK_FL_ENABLED,
 708                                                      false);
 709                 } else {
 710                         pad_sink = media_get_pad_index(tuner, true,
 711                                                        PAD_SIGNAL_ANALOG);
 712                         if (pad_sink < 0)
 713                                 return -EINVAL;
 714                         ret = media_create_pad_links(mdev,
 715                                                      MEDIA_ENT_F_CONN_RF,
 716                                                      conn, 0,
 717                                                      MEDIA_ENT_F_TUNER,
 718                                                      tuner, pad_sink,
 719                                                      MEDIA_LNK_FL_ENABLED,
 720                                                      false);
 721                 }
 722                 if (ret)
 723                         return ret;
 724         }
 725
 726         if (ntuner && ndemod) {
 727                 /* NOTE: first found tuner source pad presumed correct */
 728                 pad_source = media_get_pad_index(tuner, false,
 729                                                  PAD_SIGNAL_ANALOG);
 730                 if (pad_source < 0)
 731                         return -EINVAL;
 732                 ret = media_create_pad_links(mdev,
 733                                              MEDIA_ENT_F_TUNER,
 734                                              tuner, pad_source,
 735                                              MEDIA_ENT_F_DTV_DEMOD,
 736                                              demod, 0, MEDIA_LNK_FL_ENABLED,
 737                                              false);
 738                 if (ret)
 739                         return ret;
 740         }
 741
 742         if (ndemod && demux) {
 743                 ret = media_create_pad_links(mdev,
 744                                              MEDIA_ENT_F_DTV_DEMOD,
 745                                              demod, 1,
 746                                              MEDIA_ENT_F_TS_DEMUX,
 747                                              demux, 0, MEDIA_LNK_FL_ENABLED,
 748                                              false);
 749                 if (ret)
 750                         return ret;
 751         }
 752         if (demux && ca) {
 753                 ret = media_create_pad_link(demux, 1, ca,
 754                                             0, MEDIA_LNK_FL_ENABLED);
 755                 if (ret)
 756                         return ret;
 757         }
 758
 759         /* Create demux links for each ringbuffer/pad */
 760         if (demux) {
 761                 media_device_for_each_entity(entity, mdev) {
 762                         if (entity->function == MEDIA_ENT_F_IO_DTV) {
 763                                 if (!strncmp(entity->name, DVR_TSOUT,
 764                                     strlen(DVR_TSOUT))) {
 765                                         ret = media_create_pad_link(demux,
 766                                                                 ++dvr_pad,
 767                                                             entity, 0, 0);
 768                                         if (ret)
 769                                                 return ret;
 770                                 }
 771                                 if (!strncmp(entity->name, DEMUX_TSOUT,
 772                                     strlen(DEMUX_TSOUT))) {
 773                                         ret = media_create_pad_link(demux,
 774                                                               ++demux_pad,
 775                                                             entity, 0, 0);
 776                                         if (ret)
 777                                                 return ret;
 778                                 }
 779                         }
 780                 }
 781         }
 782
 783         /* Create interface links for FE->tuner, DVR->demux and CA->ca */
 784         media_device_for_each_intf(intf, mdev) {
 785                 if (intf->type == MEDIA_INTF_T_DVB_CA && ca) {
 786                         link = media_create_intf_link(ca, intf,
 787                                                       MEDIA_LNK_FL_ENABLED |
 788                                                       MEDIA_LNK_FL_IMMUTABLE);
 789                         if (!link)
 790                                 return -ENOMEM;
 791                 }
 792
 793                 if (intf->type == MEDIA_INTF_T_DVB_FE && tuner) {
 794                         link = media_create_intf_link(tuner, intf,
 795                                                       MEDIA_LNK_FL_ENABLED |
 796                                                       MEDIA_LNK_FL_IMMUTABLE);
 797                         if (!link)
 798                                 return -ENOMEM;
 799                 }
 800 #if 0
 801                 /*
 802                  * Indirect link - let's not create yet, as we don't know how
 803                  *                 to handle indirect links, nor if this will
 804                  *                 actually be needed.
 805                  */
 806                 if (intf->type == MEDIA_INTF_T_DVB_DVR && demux) {
 807                         link = media_create_intf_link(demux, intf,
 808                                                       MEDIA_LNK_FL_ENABLED |
 809                                                       MEDIA_LNK_FL_IMMUTABLE);
 810                         if (!link)
 811                                 return -ENOMEM;
 812                 }
 813 #endif
 814                 if (intf->type == MEDIA_INTF_T_DVB_DVR) {
 815                         ret = dvb_create_io_intf_links(adap, intf, DVR_TSOUT);
 816                         if (ret)
 817                                 return ret;
 818                 }
 819                 if (intf->type == MEDIA_INTF_T_DVB_DEMUX) {
 820                         ret = dvb_create_io_intf_links(adap, intf, DEMUX_TSOUT);
 821                         if (ret)
 822                                 return ret;
 823                 }
 824         }
 825         return 0;
 826 }
 827 EXPORT_SYMBOL_GPL(dvb_create_media_graph);
 828 #endif
 829
 830 static int dvbdev_check_free_adapter_num(int num)
 831 {
 832         struct list_head *entry;
 833         list_for_each(entry, &dvb_adapter_list) {
 834                 struct dvb_adapter *adap;
 835                 adap = list_entry(entry, struct dvb_adapter, list_head);
 836                 if (adap->num == num)
 837                         return 0;
 838         }
 839         return 1;
 840 }
 841
 842 static int dvbdev_get_free_adapter_num (void)
 843 {
 844         int num = 0;
 845
 846         while (num < DVB_MAX_ADAPTERS) {
 847                 if (dvbdev_check_free_adapter_num(num))
 848                         return num;
 849                 num++;
 850         }
 851
 852         return -ENFILE;
 853 }
 854
 855
 856 int dvb_register_adapter(struct dvb_adapter *adap, const char *name,
 857                          struct module *module, struct device *device,
 858                          short *adapter_nums)
 859 {
 860         int i, num;
 861
 862         mutex_lock(&dvbdev_register_lock);
 863
 864         for (i = 0; i < DVB_MAX_ADAPTERS; ++i) {
 865                 num = adapter_nums[i];
 866                 if (num >= 0  &&  num < DVB_MAX_ADAPTERS) {
 867                 /* use the one the driver asked for */
 868                         if (dvbdev_check_free_adapter_num(num))
 869                                 break;
 870                 } else {
 871                         num = dvbdev_get_free_adapter_num();
 872                         break;
 873                 }
 874                 num = -1;
 875         }
 876
 877         if (num < 0) {
 878                 mutex_unlock(&dvbdev_register_lock);
 879                 return -ENFILE;
 880         }
 881
 882         memset (adap, 0, sizeof(struct dvb_adapter));
 883         INIT_LIST_HEAD (&adap->device_list);
 884
 885         pr_info("DVB: registering new adapter (%s)\n", name);
 886
 887         adap->num = num;
 888         adap->name = name;
 889         adap->module = module;
 890         adap->device = device;
 891         adap->mfe_shared = 0;
 892         adap->mfe_dvbdev = NULL;
 893         mutex_init (&adap->mfe_lock);
 894
 895 #ifdef CONFIG_MEDIA_CONTROLLER_DVB
 896         mutex_init(&adap->mdev_lock);
 897 #endif
 898
 899         list_add_tail (&adap->list_head, &dvb_adapter_list);
 900
 901         mutex_unlock(&dvbdev_register_lock);
 902
 903         return num;
 904 }
 905 EXPORT_SYMBOL(dvb_register_adapter);
 906
 907
 908 int dvb_unregister_adapter(struct dvb_adapter *adap)
 909 {
 910         mutex_lock(&dvbdev_register_lock);
 911         list_del (&adap->list_head);
 912         mutex_unlock(&dvbdev_register_lock);
 913         return 0;
 914 }
 915 EXPORT_SYMBOL(dvb_unregister_adapter);
 916
 917 /* if the miracle happens and "generic_usercopy()" is included into
 918    the kernel, then this can vanish. please don't make the mistake and
 919    define this as video_usercopy(). this will introduce a dependency
 920    to the v4l "videodev.o" module, which is unnecessary for some
 921    cards (ie. the budget dvb-cards don't need the v4l module...) */
 922 int dvb_usercopy(struct file *file,
 923                      unsigned int cmd, unsigned long arg,
 924                      int (*func)(struct file *file,
 925                      unsigned int cmd, void *arg))
 926 {
 927         char    sbuf[128];
 928         void    *mbuf = NULL;
 929         void    *parg = NULL;
 930         int     err  = -EINVAL;
 931
 932         /*  Copy arguments into temp kernel buffer  */
 933         switch (_IOC_DIR(cmd)) {
 934         case _IOC_NONE:
 935                 /*
 936                  * For this command, the pointer is actually an integer
 937                  * argument.
 938                  */
 939                 parg = (void *) arg;
 940                 break;
 941         case _IOC_READ: /* some v4l ioctls are marked wrong ... */
 942         case _IOC_WRITE:
 943         case (_IOC_WRITE | _IOC_READ):
 944                 if (_IOC_SIZE(cmd) <= sizeof(sbuf)) {
 945                         parg = sbuf;
 946                 } else {
 947                         /* too big to allocate from stack */
 948                         mbuf = kmalloc(_IOC_SIZE(cmd), GFP_KERNEL);
 949                         if (NULL == mbuf)
 950                                 return -ENOMEM;
 951                         parg = mbuf;
 952                 }
 953
 954                 err = -EFAULT;
 955                 if (copy_from_user(parg, (void __user *)arg, _IOC_SIZE(cmd)))
 956                         goto out;
 957                 break;
 958         }
 959
 960         /* call driver */
 961         if ((err = func(file, cmd, parg)) == -ENOIOCTLCMD)
 962                 err = -ENOTTY;
 963
 964         if (err < 0)
 965                 goto out;
 966
 967         /*  Copy results into user buffer  */
 968         switch (_IOC_DIR(cmd))
 969         {
 970         case _IOC_READ:
 971         case (_IOC_WRITE | _IOC_READ):
 972                 if (copy_to_user((void __user *)arg, parg, _IOC_SIZE(cmd)))
 973                         err = -EFAULT;
 974                 break;
 975         }
 976
 977 out:
 978         kfree(mbuf);
 979         return err;
 980 }
 981
 982 #if IS_ENABLED(CONFIG_I2C)
 983 struct i2c_client *dvb_module_probe(const char *module_name,
 984                                     const char *name,
 985                                     struct i2c_adapter *adap,
 986                                     unsigned char addr,
 987                                     void *platform_data)
 988 {
 989         struct i2c_client *client;
 990         struct i2c_board_info *board_info;
 991
 992         board_info = kzalloc(sizeof(*board_info), GFP_KERNEL);
 993         if (!board_info)
 994                 return NULL;
 995
 996         if (name)
 997                 strscpy(board_info->type, name, I2C_NAME_SIZE);
 998         else
 999                 strscpy(board_info->type, module_name, I2C_NAME_SIZE);
1000
1001         board_info->addr = addr;
1002         board_info->platform_data = platform_data;
1003         request_module(module_name);
1004         client = i2c_new_client_device(adap, board_info);
1005         if (!i2c_client_has_driver(client)) {
1006                 kfree(board_info);
1007                 return NULL;
1008         }
1009
1010         if (!try_module_get(client->dev.driver->owner)) {
1011                 i2c_unregister_device(client);
1012                 client = NULL;
1013         }
1014
1015         kfree(board_info);
1016         return client;
1017 }
1018 EXPORT_SYMBOL_GPL(dvb_module_probe);
1019
1020 void dvb_module_release(struct i2c_client *client)
1021 {
1022         if (!client)
1023                 return;
1024
1025         module_put(client->dev.driver->owner);
1026         i2c_unregister_device(client);
1027 }
1028 EXPORT_SYMBOL_GPL(dvb_module_release);
1029 #endif
1030
1031 static int dvb_uevent(struct device *dev, struct kobj_uevent_env *env)
1032 {
1033         struct dvb_device *dvbdev = dev_get_drvdata(dev);
1034
1035         add_uevent_var(env, "DVB_ADAPTER_NUM=%d", dvbdev->adapter->num);
1036         add_uevent_var(env, "DVB_DEVICE_TYPE=%s", dnames[dvbdev->type]);
1037         add_uevent_var(env, "DVB_DEVICE_NUM=%d", dvbdev->id);
1038         return 0;
1039 }
1040
1041 static char *dvb_devnode(struct device *dev, umode_t *mode)
1042 {
1043         struct dvb_device *dvbdev = dev_get_drvdata(dev);
1044
1045         return kasprintf(GFP_KERNEL, "dvb/adapter%d/%s%d",
1046                 dvbdev->adapter->num, dnames[dvbdev->type], dvbdev->id);
1047 }
1048
1049
1050 static int __init init_dvbdev(void)
1051 {
1052         int retval;
1053         dev_t dev = MKDEV(DVB_MAJOR, 0);
1054
1055         if ((retval = register_chrdev_region(dev, MAX_DVB_MINORS, "DVB")) != 0) {
1056                 pr_err("dvb-core: unable to get major %d\n", DVB_MAJOR);
1057                 return retval;
1058         }
1059
1060         cdev_init(&dvb_device_cdev, &dvb_device_fops);
1061         if ((retval = cdev_add(&dvb_device_cdev, dev, MAX_DVB_MINORS)) != 0) {
1062                 pr_err("dvb-core: unable register character device\n");
1063                 goto error;
1064         }
1065
1066         dvb_class = class_create(THIS_MODULE, "dvb");
1067         if (IS_ERR(dvb_class)) {
1068                 retval = PTR_ERR(dvb_class);
1069                 goto error;
1070         }
1071         dvb_class->dev_uevent = dvb_uevent;
1072         dvb_class->devnode = dvb_devnode;
1073         return 0;
1074
1075 error:
1076         cdev_del(&dvb_device_cdev);
1077         unregister_chrdev_region(dev, MAX_DVB_MINORS);
1078         return retval;
1079 }
1080
1081
1082 static void __exit exit_dvbdev(void)
1083 {
1084         class_destroy(dvb_class);
1085         cdev_del(&dvb_device_cdev);
1086         unregister_chrdev_region(MKDEV(DVB_MAJOR, 0), MAX_DVB_MINORS);
1087 }
1088
1089 subsys_initcall(init_dvbdev);
1090 module_exit(exit_dvbdev);
1091
1092 MODULE_DESCRIPTION("DVB Core Driver");
1093 MODULE_AUTHOR("Marcus Metzler, Ralph Metzler, Holger Waechtler");
1094 MODULE_LICENSE("GPL");