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