drivers/media/dvb-core/dvbdev.c

   1 /*
   2  * dvbdev.c
   3  *
   4  * Copyright (C) 2000 Ralph  Metzler <[email protected]>
   5  *                  & Marcus Metzler <[email protected]>
   6  *                    for convergence integrated media GmbH
   7  *
   8  * This program is free software; you can redistribute it and/or
   9  * modify it under the terms of the GNU Lesser General Public License
  10  * as published by the Free Software Foundation; either version 2.1
  11  * of the License, or (at your option) any later version.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  * GNU General Public License for more details.
  17  *
  18  */
  19
  20 #define pr_fmt(fmt) "dvbdev: " fmt
  21
  22 #include <linux/types.h>
  23 #include <linux/errno.h>
  24 #include <linux/string.h>
  25 #include <linux/module.h>
  26 #include <linux/kernel.h>
  27 #include <linux/i2c.h>
  28 #include <linux/init.h>
  29 #include <linux/slab.h>
  30 #include <linux/device.h>
  31 #include <linux/fs.h>
  32 #include <linux/cdev.h>
  33 #include <linux/mutex.h>
  34 #include <media/dvbdev.h>
  35
  36 /* Due to enum tuner_pad_index */
  37 #include <media/tuner.h>
  38
  39 static DEFINE_MUTEX(dvbdev_mutex);
  40 static int dvbdev_debug;
  41
  42 module_param(dvbdev_debug, int, 0644);
  43 MODULE_PARM_DESC(dvbdev_debug, "Turn on/off device debugging (default:off).");
  44
  45 #define dprintk(fmt, arg...) do {                                       \
  46         if (dvbdev_debug)                                               \
  47                 printk(KERN_DEBUG pr_fmt("%s: " fmt),                   \
  48                        __func__, ##arg);                                \
  49 } while (0)
  50
  51 static LIST_HEAD(dvb_adapter_list);
  52 static DEFINE_MUTEX(dvbdev_register_lock);
  53
  54 static const char * const dnames[] = {
  55         [DVB_DEVICE_VIDEO] =            "video",
  56         [DVB_DEVICE_AUDIO] =            "audio",
  57         [DVB_DEVICE_SEC] =              "sec",
  58         [DVB_DEVICE_FRONTEND] =         "frontend",
  59         [DVB_DEVICE_DEMUX] =            "demux",
  60         [DVB_DEVICE_DVR] =              "dvr",
  61         [DVB_DEVICE_CA] =               "ca",
  62         [DVB_DEVICE_NET] =              "net",
  63         [DVB_DEVICE_OSD] =              "osd"
  64 };
  65
  66 #ifdef CONFIG_DVB_DYNAMIC_MINORS
  67 #define MAX_DVB_MINORS          256
  68 #define DVB_MAX_IDS             MAX_DVB_MINORS
  69 #else
  70 #define DVB_MAX_IDS             4
  71
  72 static const u8 minor_type[] = {
  73        [DVB_DEVICE_VIDEO]      = 0,
  74        [DVB_DEVICE_AUDIO]      = 1,
  75        [DVB_DEVICE_SEC]        = 2,
  76        [DVB_DEVICE_FRONTEND]   = 3,
  77        [DVB_DEVICE_DEMUX]      = 4,
  78        [DVB_DEVICE_DVR]        = 5,
  79        [DVB_DEVICE_CA]         = 6,
  80        [DVB_DEVICE_NET]        = 7,
  81        [DVB_DEVICE_OSD]        = 8,
  82 };
  83
  84 #define nums2minor(num, type, id) \
  85        (((num) << 6) | ((id) << 4) | minor_type[type])
  86
  87 #define MAX_DVB_MINORS          (DVB_MAX_ADAPTERS*64)
  88 #endif
  89
  90 static struct class *dvb_class;
  91
  92 static struct dvb_device *dvb_minors[MAX_DVB_MINORS];
  93 static DECLARE_RWSEM(minor_rwsem);
  94
  95 static int dvb_device_open(struct inode *inode, struct file *file)
  96 {
  97         struct dvb_device *dvbdev;
  98
  99         mutex_lock(&dvbdev_mutex);
 100         down_read(&minor_rwsem);
 101         dvbdev = dvb_minors[iminor(inode)];
 102
 103         if (dvbdev && dvbdev->fops) {
 104                 int err = 0;
 105                 const struct file_operations *new_fops;
 106
 107                 new_fops = fops_get(dvbdev->fops);
 108                 if (!new_fops)
 109                         goto fail;
 110                 file->private_data = dvbdev;
 111                 replace_fops(file, new_fops);
 112                 if (file->f_op->open)
 113                         err = file->f_op->open(inode, file);
 114                 up_read(&minor_rwsem);
 115                 mutex_unlock(&dvbdev_mutex);
 116                 return err;
 117         }
 118 fail:
 119         up_read(&minor_rwsem);
 120         mutex_unlock(&dvbdev_mutex);
 121         return -ENODEV;
 122 }
 123
 124
 125 static const struct file_operations dvb_device_fops =
 126 {
 127         .owner =        THIS_MODULE,
 128         .open =         dvb_device_open,
 129         .llseek =       noop_llseek,
 130 };
 131
 132 static struct cdev dvb_device_cdev;
 133
 134 int dvb_generic_open(struct inode *inode, struct file *file)
 135 {
 136         struct dvb_device *dvbdev = file->private_data;
 137
 138         if (!dvbdev)
 139                 return -ENODEV;
 140
 141         if (!dvbdev->users)
 142                 return -EBUSY;
 143
 144         if ((file->f_flags & O_ACCMODE) == O_RDONLY) {
 145                 if (!dvbdev->readers)
 146                         return -EBUSY;
 147                 dvbdev->readers--;
 148         } else {
 149                 if (!dvbdev->writers)
 150                         return -EBUSY;
 151                 dvbdev->writers--;
 152         }
 153
 154         dvbdev->users--;
 155         return 0;
 156 }
 157 EXPORT_SYMBOL(dvb_generic_open);
 158
 159
 160 int dvb_generic_release(struct inode *inode, struct file *file)
 161 {
 162         struct dvb_device *dvbdev = file->private_data;
 163
 164         if (!dvbdev)
 165                 return -ENODEV;
 166
 167         if ((file->f_flags & O_ACCMODE) == O_RDONLY) {
 168                 dvbdev->readers++;
 169         } else {
 170                 dvbdev->writers++;
 171         }
 172
 173         dvbdev->users++;
 174         return 0;
 175 }
 176 EXPORT_SYMBOL(dvb_generic_release);
 177
 178
 179 long dvb_generic_ioctl(struct file *file,
 180                        unsigned int cmd, unsigned long arg)
 181 {
 182         struct dvb_device *dvbdev = file->private_data;
 183
 184         if (!dvbdev)
 185                 return -ENODEV;
 186
 187         if (!dvbdev->kernel_ioctl)
 188                 return -EINVAL;
 189
 190         return dvb_usercopy(file, cmd, arg, dvbdev->kernel_ioctl);
 191 }
 192 EXPORT_SYMBOL(dvb_generic_ioctl);
 193
 194
 195 static int dvbdev_get_free_id (struct dvb_adapter *adap, int type)
 196 {
 197         u32 id = 0;
 198
 199         while (id < DVB_MAX_IDS) {
 200                 struct dvb_device *dev;
 201                 list_for_each_entry(dev, &adap->device_list, list_head)
 202                         if (dev->type == type && dev->id == id)
 203                                 goto skip;
 204                 return id;
 205 skip:
 206                 id++;
 207         }
 208         return -ENFILE;
 209 }
 210
 211 static void dvb_media_device_free(struct dvb_device *dvbdev)
 212 {
 213 #if defined(CONFIG_MEDIA_CONTROLLER_DVB)
 214         if (dvbdev->entity) {
 215                 media_device_unregister_entity(dvbdev->entity);
 216                 kfree(dvbdev->entity);
 217                 kfree(dvbdev->pads);
 218                 dvbdev->entity = NULL;
 219                 dvbdev->pads = NULL;
 220         }
 221
 222         if (dvbdev->tsout_entity) {
 223                 int i;
 224
 225                 for (i = 0; i < dvbdev->tsout_num_entities; i++) {
 226                         media_device_unregister_entity(&dvbdev->tsout_entity[i]);
 227                         kfree(dvbdev->tsout_entity[i].name);
 228                 }
 229                 kfree(dvbdev->tsout_entity);
 230                 kfree(dvbdev->tsout_pads);
 231                 dvbdev->tsout_entity = NULL;
 232                 dvbdev->tsout_pads = NULL;
 233
 234                 dvbdev->tsout_num_entities = 0;
 235         }
 236
 237         if (dvbdev->intf_devnode) {
 238                 media_devnode_remove(dvbdev->intf_devnode);
 239                 dvbdev->intf_devnode = NULL;
 240         }
 241
 242         if (dvbdev->adapter->conn) {
 243                 media_device_unregister_entity(dvbdev->adapter->conn);
 244                 dvbdev->adapter->conn = NULL;
 245                 kfree(dvbdev->adapter->conn_pads);
 246                 dvbdev->adapter->conn_pads = NULL;
 247         }
 248 #endif
 249 }
 250
 251 #if defined(CONFIG_MEDIA_CONTROLLER_DVB)
 252 static int dvb_create_tsout_entity(struct dvb_device *dvbdev,
 253                                     const char *name, int npads)
 254 {
 255         int i, ret = 0;
 256
 257         dvbdev->tsout_pads = kcalloc(npads, sizeof(*dvbdev->tsout_pads),
 258                                      GFP_KERNEL);
 259         if (!dvbdev->tsout_pads)
 260                 return -ENOMEM;
 261
 262         dvbdev->tsout_entity = kcalloc(npads, sizeof(*dvbdev->tsout_entity),
 263                                        GFP_KERNEL);
 264         if (!dvbdev->tsout_entity)
 265                 return -ENOMEM;
 266
 267         dvbdev->tsout_num_entities = npads;
 268
 269         for (i = 0; i < npads; i++) {
 270                 struct media_pad *pads = &dvbdev->tsout_pads[i];
 271                 struct media_entity *entity = &dvbdev->tsout_entity[i];
 272
 273                 entity->name = kasprintf(GFP_KERNEL, "%s #%d", name, i);
 274                 if (!entity->name)
 275                         return -ENOMEM;
 276
 277                 entity->function = MEDIA_ENT_F_IO_DTV;
 278                 pads->flags = MEDIA_PAD_FL_SINK;
 279
 280                 ret = media_entity_pads_init(entity, 1, pads);
 281                 if (ret < 0)
 282                         return ret;
 283
 284                 ret = media_device_register_entity(dvbdev->adapter->mdev,
 285                                                    entity);
 286                 if (ret < 0)
 287                         return ret;
 288         }
 289         return 0;
 290 }
 291
 292 #define DEMUX_TSOUT     "demux-tsout"
 293 #define DVR_TSOUT       "dvr-tsout"
 294
 295 static int dvb_create_media_entity(struct dvb_device *dvbdev,
 296                                    int type, int demux_sink_pads)
 297 {
 298         int i, ret, npads;
 299
 300         switch (type) {
 301         case DVB_DEVICE_FRONTEND:
 302                 npads = 2;
 303                 break;
 304         case DVB_DEVICE_DVR:
 305                 ret = dvb_create_tsout_entity(dvbdev, DVR_TSOUT,
 306                                               demux_sink_pads);
 307                 return ret;
 308         case DVB_DEVICE_DEMUX:
 309                 npads = 1 + demux_sink_pads;
 310                 ret = dvb_create_tsout_entity(dvbdev, DEMUX_TSOUT,
 311                                               demux_sink_pads);
 312                 if (ret < 0)
 313                         return ret;
 314                 break;
 315         case DVB_DEVICE_CA:
 316                 npads = 2;
 317                 break;
 318         case DVB_DEVICE_NET:
 319                 /*
 320                  * We should be creating entities for the MPE/ULE
 321                  * decapsulation hardware (or software implementation).
 322                  *
 323                  * However, the number of for the MPE/ULE decaps may not be
 324                  * fixed. As we don't have yet dynamic support for PADs at
 325                  * the Media Controller, let's not create the decap
 326                  * entities yet.
 327                  */
 328                 return 0;
 329         default:
 330                 return 0;
 331         }
 332
 333         dvbdev->entity = kzalloc(sizeof(*dvbdev->entity), GFP_KERNEL);
 334         if (!dvbdev->entity)
 335                 return -ENOMEM;
 336
 337         dvbdev->entity->name = dvbdev->name;
 338
 339         if (npads) {
 340                 dvbdev->pads = kcalloc(npads, sizeof(*dvbdev->pads),
 341                                        GFP_KERNEL);
 342                 if (!dvbdev->pads) {
 343                         kfree(dvbdev->entity);
 344                         return -ENOMEM;
 345                 }
 346         }
 347
 348         switch (type) {
 349         case DVB_DEVICE_FRONTEND:
 350                 dvbdev->entity->function = MEDIA_ENT_F_DTV_DEMOD;
 351                 dvbdev->pads[0].flags = MEDIA_PAD_FL_SINK;
 352                 dvbdev->pads[1].flags = MEDIA_PAD_FL_SOURCE;
 353                 break;
 354         case DVB_DEVICE_DEMUX:
 355                 dvbdev->entity->function = MEDIA_ENT_F_TS_DEMUX;
 356                 dvbdev->pads[0].flags = MEDIA_PAD_FL_SINK;
 357                 for (i = 1; i < npads; i++)
 358                         dvbdev->pads[i].flags = MEDIA_PAD_FL_SOURCE;
 359                 break;
 360         case DVB_DEVICE_CA:
 361                 dvbdev->entity->function = MEDIA_ENT_F_DTV_CA;
 362                 dvbdev->pads[0].flags = MEDIA_PAD_FL_SINK;
 363                 dvbdev->pads[1].flags = MEDIA_PAD_FL_SOURCE;
 364                 break;
 365         default:
 366                 /* Should never happen, as the first switch prevents it */
 367                 kfree(dvbdev->entity);
 368                 kfree(dvbdev->pads);
 369                 dvbdev->entity = NULL;
 370                 dvbdev->pads = NULL;
 371                 return 0;
 372         }
 373
 374         if (npads) {
 375                 ret = media_entity_pads_init(dvbdev->entity, npads, dvbdev->pads);
 376                 if (ret)
 377                         return ret;
 378         }
 379         ret = media_device_register_entity(dvbdev->adapter->mdev,
 380                                            dvbdev->entity);
 381         if (ret)
 382                 return ret;
 383
 384         pr_info("%s: media entity '%s' registered.\n",
 385                 __func__, dvbdev->entity->name);
 386
 387         return 0;
 388 }
 389 #endif
 390
 391 static int dvb_register_media_device(struct dvb_device *dvbdev,
 392                                      int type, int minor,
 393                                      unsigned demux_sink_pads)
 394 {
 395 #if defined(CONFIG_MEDIA_CONTROLLER_DVB)
 396         struct media_link *link;
 397         u32 intf_type;
 398         int ret;
 399
 400         if (!dvbdev->adapter->mdev)
 401                 return 0;
 402
 403         ret = dvb_create_media_entity(dvbdev, type, demux_sink_pads);
 404         if (ret)
 405                 return ret;
 406
 407         switch (type) {
 408         case DVB_DEVICE_FRONTEND:
 409                 intf_type = MEDIA_INTF_T_DVB_FE;
 410                 break;
 411         case DVB_DEVICE_DEMUX:
 412                 intf_type = MEDIA_INTF_T_DVB_DEMUX;
 413                 break;
 414         case DVB_DEVICE_DVR:
 415                 intf_type = MEDIA_INTF_T_DVB_DVR;
 416                 break;
 417         case DVB_DEVICE_CA:
 418                 intf_type = MEDIA_INTF_T_DVB_CA;
 419                 break;
 420         case DVB_DEVICE_NET:
 421                 intf_type = MEDIA_INTF_T_DVB_NET;
 422                 break;
 423         default:
 424                 return 0;
 425         }
 426
 427         dvbdev->intf_devnode = media_devnode_create(dvbdev->adapter->mdev,
 428                                                     intf_type, 0,
 429                                                     DVB_MAJOR, minor);
 430
 431         if (!dvbdev->intf_devnode)
 432                 return -ENOMEM;
 433
 434         /*
 435          * Create the "obvious" link, e. g. the ones that represent
 436          * a direct association between an interface and an entity.
 437          * Other links should be created elsewhere, like:
 438          *              DVB FE intf    -> tuner
 439          *              DVB demux intf -> dvr
 440          */
 441
 442         if (!dvbdev->entity)
 443                 return 0;
 444
 445         link = media_create_intf_link(dvbdev->entity,
 446                                       &dvbdev->intf_devnode->intf,
 447                                       MEDIA_LNK_FL_ENABLED |
 448                                       MEDIA_LNK_FL_IMMUTABLE);
 449         if (!link)
 450                 return -ENOMEM;
 451 #endif
 452         return 0;
 453 }
 454
 455 int dvb_register_device(struct dvb_adapter *adap, struct dvb_device **pdvbdev,
 456                         const struct dvb_device *template, void *priv,
 457                         enum dvb_device_type type, int demux_sink_pads)
 458 {
 459         struct dvb_device *dvbdev;
 460         struct file_operations *dvbdevfops;
 461         struct device *clsdev;
 462         int minor;
 463         int id, ret;
 464
 465         mutex_lock(&dvbdev_register_lock);
 466
 467         if ((id = dvbdev_get_free_id (adap, type)) < 0){
 468                 mutex_unlock(&dvbdev_register_lock);
 469                 *pdvbdev = NULL;
 470                 pr_err("%s: couldn't find free device id\n", __func__);
 471                 return -ENFILE;
 472         }
 473
 474         *pdvbdev = dvbdev = kzalloc(sizeof(*dvbdev), GFP_KERNEL);
 475
 476         if (!dvbdev){
 477                 mutex_unlock(&dvbdev_register_lock);
 478                 return -ENOMEM;
 479         }
 480
 481         dvbdevfops = kmemdup(template->fops, sizeof(*dvbdevfops), GFP_KERNEL);
 482
 483         if (!dvbdevfops){
 484                 kfree (dvbdev);
 485                 mutex_unlock(&dvbdev_register_lock);
 486                 return -ENOMEM;
 487         }
 488
 489         memcpy(dvbdev, template, sizeof(struct dvb_device));
 490         dvbdev->type = type;
 491         dvbdev->id = id;
 492         dvbdev->adapter = adap;
 493         dvbdev->priv = priv;
 494         dvbdev->fops = dvbdevfops;
 495         init_waitqueue_head (&dvbdev->wait_queue);
 496
 497         dvbdevfops->owner = adap->module;
 498
 499         list_add_tail (&dvbdev->list_head, &adap->device_list);
 500
 501         down_write(&minor_rwsem);
 502 #ifdef CONFIG_DVB_DYNAMIC_MINORS
 503         for (minor = 0; minor < MAX_DVB_MINORS; minor++)
 504                 if (dvb_minors[minor] == NULL)
 505                         break;
 506
 507         if (minor == MAX_DVB_MINORS) {
 508                 kfree(dvbdevfops);
 509                 kfree(dvbdev);
 510                 up_write(&minor_rwsem);
 511                 mutex_unlock(&dvbdev_register_lock);
 512                 return -EINVAL;
 513         }
 514 #else
 515         minor = nums2minor(adap->num, type, id);
 516 #endif
 517
 518         dvbdev->minor = minor;
 519         dvb_minors[minor] = dvbdev;
 520         up_write(&minor_rwsem);
 521
 522         ret = dvb_register_media_device(dvbdev, type, minor, demux_sink_pads);
 523         if (ret) {
 524                 pr_err("%s: dvb_register_media_device failed to create the mediagraph\n",
 525                       __func__);
 526
 527                 dvb_media_device_free(dvbdev);
 528                 kfree(dvbdevfops);
 529                 kfree(dvbdev);
 530                 mutex_unlock(&dvbdev_register_lock);
 531                 return ret;
 532         }
 533
 534         mutex_unlock(&dvbdev_register_lock);
 535
 536         clsdev = device_create(dvb_class, adap->device,
 537                                MKDEV(DVB_MAJOR, minor),
 538                                dvbdev, "dvb%d.%s%d", adap->num, dnames[type], id);
 539         if (IS_ERR(clsdev)) {
 540                 pr_err("%s: failed to create device dvb%d.%s%d (%ld)\n",
 541                        __func__, adap->num, dnames[type], id, PTR_ERR(clsdev));
 542                 dvb_media_device_free(dvbdev);
 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         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 void dvb_free_device(struct dvb_device *dvbdev)
 574 {
 575         if (!dvbdev)
 576                 return;
 577
 578         kfree (dvbdev->fops);
 579         kfree (dvbdev);
 580 }
 581 EXPORT_SYMBOL(dvb_free_device);
 582
 583
 584 void dvb_unregister_device(struct dvb_device *dvbdev)
 585 {
 586         dvb_remove_device(dvbdev);
 587         dvb_free_device(dvbdev);
 588 }
 589 EXPORT_SYMBOL(dvb_unregister_device);
 590
 591
 592 #ifdef CONFIG_MEDIA_CONTROLLER_DVB
 593
 594 static int dvb_create_io_intf_links(struct dvb_adapter *adap,
 595                                     struct media_interface *intf,
 596                                     char *name)
 597 {
 598         struct media_device *mdev = adap->mdev;
 599         struct media_entity *entity;
 600         struct media_link *link;
 601
 602         media_device_for_each_entity(entity, mdev) {
 603                 if (entity->function == MEDIA_ENT_F_IO_DTV) {
 604                         if (strncmp(entity->name, name, strlen(name)))
 605                                 continue;
 606                         link = media_create_intf_link(entity, intf,
 607                                                       MEDIA_LNK_FL_ENABLED |
 608                                                       MEDIA_LNK_FL_IMMUTABLE);
 609                         if (!link)
 610                                 return -ENOMEM;
 611                 }
 612         }
 613         return 0;
 614 }
 615
 616 int dvb_create_media_graph(struct dvb_adapter *adap,
 617                            bool create_rf_connector)
 618 {
 619         struct media_device *mdev = adap->mdev;
 620         struct media_entity *entity, *tuner = NULL, *demod = NULL, *conn;
 621         struct media_entity *demux = NULL, *ca = NULL;
 622         struct media_link *link;
 623         struct media_interface *intf;
 624         unsigned demux_pad = 0;
 625         unsigned dvr_pad = 0;
 626         unsigned ntuner = 0, ndemod = 0;
 627         int ret, pad_source, pad_sink;
 628         static const char *connector_name = "Television";
 629
 630         if (!mdev)
 631                 return 0;
 632
 633         media_device_for_each_entity(entity, mdev) {
 634                 switch (entity->function) {
 635                 case MEDIA_ENT_F_TUNER:
 636                         tuner = entity;
 637                         ntuner++;
 638                         break;
 639                 case MEDIA_ENT_F_DTV_DEMOD:
 640                         demod = entity;
 641                         ndemod++;
 642                         break;
 643                 case MEDIA_ENT_F_TS_DEMUX:
 644                         demux = entity;
 645                         break;
 646                 case MEDIA_ENT_F_DTV_CA:
 647                         ca = entity;
 648                         break;
 649                 }
 650         }
 651
 652         /*
 653          * Prepare to signalize to media_create_pad_links() that multiple
 654          * entities of the same type exists and a 1:n or n:1 links need to be
 655          * created.
 656          * NOTE: if both tuner and demod have multiple instances, it is up
 657          * to the caller driver to create such links.
 658          */
 659         if (ntuner > 1)
 660                 tuner = NULL;
 661         if (ndemod > 1)
 662                 demod = NULL;
 663
 664         if (create_rf_connector) {
 665                 conn = kzalloc(sizeof(*conn), GFP_KERNEL);
 666                 if (!conn)
 667                         return -ENOMEM;
 668                 adap->conn = conn;
 669
 670                 adap->conn_pads = kzalloc(sizeof(*adap->conn_pads), GFP_KERNEL);
 671                 if (!adap->conn_pads)
 672                         return -ENOMEM;
 673
 674                 conn->flags = MEDIA_ENT_FL_CONNECTOR;
 675                 conn->function = MEDIA_ENT_F_CONN_RF;
 676                 conn->name = connector_name;
 677                 adap->conn_pads->flags = MEDIA_PAD_FL_SOURCE;
 678
 679                 ret = media_entity_pads_init(conn, 1, adap->conn_pads);
 680                 if (ret)
 681                         return ret;
 682
 683                 ret = media_device_register_entity(mdev, conn);
 684                 if (ret)
 685                         return ret;
 686
 687                 if (!ntuner) {
 688                         ret = media_create_pad_links(mdev,
 689                                                      MEDIA_ENT_F_CONN_RF,
 690                                                      conn, 0,
 691                                                      MEDIA_ENT_F_DTV_DEMOD,
 692                                                      demod, 0,
 693                                                      MEDIA_LNK_FL_ENABLED,
 694                                                      false);
 695                 } else {
 696                         pad_sink = media_get_pad_index(tuner, true,
 697                                                        PAD_SIGNAL_ANALOG);
 698                         if (pad_sink < 0)
 699                                 return -EINVAL;
 700                         ret = media_create_pad_links(mdev,
 701                                                      MEDIA_ENT_F_CONN_RF,
 702                                                      conn, 0,
 703                                                      MEDIA_ENT_F_TUNER,
 704                                                      tuner, pad_sink,
 705                                                      MEDIA_LNK_FL_ENABLED,
 706                                                      false);
 707                 }
 708                 if (ret)
 709                         return ret;
 710         }
 711
 712         if (ntuner && ndemod) {
 713                 /* NOTE: first found tuner source pad presumed correct */
 714                 pad_source = media_get_pad_index(tuner, false,
 715                                                  PAD_SIGNAL_ANALOG);
 716                 if (pad_source < 0)
 717                         return -EINVAL;
 718                 ret = media_create_pad_links(mdev,
 719                                              MEDIA_ENT_F_TUNER,
 720                                              tuner, pad_source,
 721                                              MEDIA_ENT_F_DTV_DEMOD,
 722                                              demod, 0, MEDIA_LNK_FL_ENABLED,
 723                                              false);
 724                 if (ret)
 725                         return ret;
 726         }
 727
 728         if (ndemod && demux) {
 729                 ret = media_create_pad_links(mdev,
 730                                              MEDIA_ENT_F_DTV_DEMOD,
 731                                              demod, 1,
 732                                              MEDIA_ENT_F_TS_DEMUX,
 733                                              demux, 0, MEDIA_LNK_FL_ENABLED,
 734                                              false);
 735                 if (ret)
 736                         return ret;
 737         }
 738         if (demux && ca) {
 739                 ret = media_create_pad_link(demux, 1, ca,
 740                                             0, MEDIA_LNK_FL_ENABLED);
 741                 if (ret)
 742                         return ret;
 743         }
 744
 745         /* Create demux links for each ringbuffer/pad */
 746         if (demux) {
 747                 media_device_for_each_entity(entity, mdev) {
 748                         if (entity->function == MEDIA_ENT_F_IO_DTV) {
 749                                 if (!strncmp(entity->name, DVR_TSOUT,
 750                                     strlen(DVR_TSOUT))) {
 751                                         ret = media_create_pad_link(demux,
 752                                                                 ++dvr_pad,
 753                                                             entity, 0, 0);
 754                                         if (ret)
 755                                                 return ret;
 756                                 }
 757                                 if (!strncmp(entity->name, DEMUX_TSOUT,
 758                                     strlen(DEMUX_TSOUT))) {
 759                                         ret = media_create_pad_link(demux,
 760                                                               ++demux_pad,
 761                                                             entity, 0, 0);
 762                                         if (ret)
 763                                                 return ret;
 764                                 }
 765                         }
 766                 }
 767         }
 768
 769         /* Create interface links for FE->tuner, DVR->demux and CA->ca */
 770         media_device_for_each_intf(intf, mdev) {
 771                 if (intf->type == MEDIA_INTF_T_DVB_CA && ca) {
 772                         link = media_create_intf_link(ca, intf,
 773                                                       MEDIA_LNK_FL_ENABLED |
 774                                                       MEDIA_LNK_FL_IMMUTABLE);
 775                         if (!link)
 776                                 return -ENOMEM;
 777                 }
 778
 779                 if (intf->type == MEDIA_INTF_T_DVB_FE && tuner) {
 780                         link = media_create_intf_link(tuner, intf,
 781                                                       MEDIA_LNK_FL_ENABLED |
 782                                                       MEDIA_LNK_FL_IMMUTABLE);
 783                         if (!link)
 784                                 return -ENOMEM;
 785                 }
 786 #if 0
 787                 /*
 788                  * Indirect link - let's not create yet, as we don't know how
 789                  *                 to handle indirect links, nor if this will
 790                  *                 actually be needed.
 791                  */
 792                 if (intf->type == MEDIA_INTF_T_DVB_DVR && demux) {
 793                         link = media_create_intf_link(demux, intf,
 794                                                       MEDIA_LNK_FL_ENABLED |
 795                                                       MEDIA_LNK_FL_IMMUTABLE);
 796                         if (!link)
 797                                 return -ENOMEM;
 798                 }
 799 #endif
 800                 if (intf->type == MEDIA_INTF_T_DVB_DVR) {
 801                         ret = dvb_create_io_intf_links(adap, intf, DVR_TSOUT);
 802                         if (ret)
 803                                 return ret;
 804                 }
 805                 if (intf->type == MEDIA_INTF_T_DVB_DEMUX) {
 806                         ret = dvb_create_io_intf_links(adap, intf, DEMUX_TSOUT);
 807                         if (ret)
 808                                 return ret;
 809                 }
 810         }
 811         return 0;
 812 }
 813 EXPORT_SYMBOL_GPL(dvb_create_media_graph);
 814 #endif
 815
 816 static int dvbdev_check_free_adapter_num(int num)
 817 {
 818         struct list_head *entry;
 819         list_for_each(entry, &dvb_adapter_list) {
 820                 struct dvb_adapter *adap;
 821                 adap = list_entry(entry, struct dvb_adapter, list_head);
 822                 if (adap->num == num)
 823                         return 0;
 824         }
 825         return 1;
 826 }
 827
 828 static int dvbdev_get_free_adapter_num (void)
 829 {
 830         int num = 0;
 831
 832         while (num < DVB_MAX_ADAPTERS) {
 833                 if (dvbdev_check_free_adapter_num(num))
 834                         return num;
 835                 num++;
 836         }
 837
 838         return -ENFILE;
 839 }
 840
 841
 842 int dvb_register_adapter(struct dvb_adapter *adap, const char *name,
 843                          struct module *module, struct device *device,
 844                          short *adapter_nums)
 845 {
 846         int i, num;
 847
 848         mutex_lock(&dvbdev_register_lock);
 849
 850         for (i = 0; i < DVB_MAX_ADAPTERS; ++i) {
 851                 num = adapter_nums[i];
 852                 if (num >= 0  &&  num < DVB_MAX_ADAPTERS) {
 853                 /* use the one the driver asked for */
 854                         if (dvbdev_check_free_adapter_num(num))
 855                                 break;
 856                 } else {
 857                         num = dvbdev_get_free_adapter_num();
 858                         break;
 859                 }
 860                 num = -1;
 861         }
 862
 863         if (num < 0) {
 864                 mutex_unlock(&dvbdev_register_lock);
 865                 return -ENFILE;
 866         }
 867
 868         memset (adap, 0, sizeof(struct dvb_adapter));
 869         INIT_LIST_HEAD (&adap->device_list);
 870
 871         pr_info("DVB: registering new adapter (%s)\n", name);
 872
 873         adap->num = num;
 874         adap->name = name;
 875         adap->module = module;
 876         adap->device = device;
 877         adap->mfe_shared = 0;
 878         adap->mfe_dvbdev = NULL;
 879         mutex_init (&adap->mfe_lock);
 880
 881 #ifdef CONFIG_MEDIA_CONTROLLER_DVB
 882         mutex_init(&adap->mdev_lock);
 883 #endif
 884
 885         list_add_tail (&adap->list_head, &dvb_adapter_list);
 886
 887         mutex_unlock(&dvbdev_register_lock);
 888
 889         return num;
 890 }
 891 EXPORT_SYMBOL(dvb_register_adapter);
 892
 893
 894 int dvb_unregister_adapter(struct dvb_adapter *adap)
 895 {
 896         mutex_lock(&dvbdev_register_lock);
 897         list_del (&adap->list_head);
 898         mutex_unlock(&dvbdev_register_lock);
 899         return 0;
 900 }
 901 EXPORT_SYMBOL(dvb_unregister_adapter);
 902
 903 /* if the miracle happens and "generic_usercopy()" is included into
 904    the kernel, then this can vanish. please don't make the mistake and
 905    define this as video_usercopy(). this will introduce a dependency
 906    to the v4l "videodev.o" module, which is unnecessary for some
 907    cards (ie. the budget dvb-cards don't need the v4l module...) */
 908 int dvb_usercopy(struct file *file,
 909                      unsigned int cmd, unsigned long arg,
 910                      int (*func)(struct file *file,
 911                      unsigned int cmd, void *arg))
 912 {
 913         char    sbuf[128];
 914         void    *mbuf = NULL;
 915         void    *parg = NULL;
 916         int     err  = -EINVAL;
 917
 918         /*  Copy arguments into temp kernel buffer  */
 919         switch (_IOC_DIR(cmd)) {
 920         case _IOC_NONE:
 921                 /*
 922                  * For this command, the pointer is actually an integer
 923                  * argument.
 924                  */
 925                 parg = (void *) arg;
 926                 break;
 927         case _IOC_READ: /* some v4l ioctls are marked wrong ... */
 928         case _IOC_WRITE:
 929         case (_IOC_WRITE | _IOC_READ):
 930                 if (_IOC_SIZE(cmd) <= sizeof(sbuf)) {
 931                         parg = sbuf;
 932                 } else {
 933                         /* too big to allocate from stack */
 934                         mbuf = kmalloc(_IOC_SIZE(cmd), GFP_KERNEL);
 935                         if (NULL == mbuf)
 936                                 return -ENOMEM;
 937                         parg = mbuf;
 938                 }
 939
 940                 err = -EFAULT;
 941                 if (copy_from_user(parg, (void __user *)arg, _IOC_SIZE(cmd)))
 942                         goto out;
 943                 break;
 944         }
 945
 946         /* call driver */
 947         if ((err = func(file, cmd, parg)) == -ENOIOCTLCMD)
 948                 err = -ENOTTY;
 949
 950         if (err < 0)
 951                 goto out;
 952
 953         /*  Copy results into user buffer  */
 954         switch (_IOC_DIR(cmd))
 955         {
 956         case _IOC_READ:
 957         case (_IOC_WRITE | _IOC_READ):
 958                 if (copy_to_user((void __user *)arg, parg, _IOC_SIZE(cmd)))
 959                         err = -EFAULT;
 960                 break;
 961         }
 962
 963 out:
 964         kfree(mbuf);
 965         return err;
 966 }
 967
 968 #if IS_ENABLED(CONFIG_I2C)
 969 struct i2c_client *dvb_module_probe(const char *module_name,
 970                                     const char *name,
 971                                     struct i2c_adapter *adap,
 972                                     unsigned char addr,
 973                                     void *platform_data)
 974 {
 975         struct i2c_client *client;
 976         struct i2c_board_info *board_info;
 977
 978         board_info = kzalloc(sizeof(*board_info), GFP_KERNEL);
 979         if (!board_info)
 980                 return NULL;
 981
 982         if (name)
 983                 strscpy(board_info->type, name, I2C_NAME_SIZE);
 984         else
 985                 strscpy(board_info->type, module_name, I2C_NAME_SIZE);
 986
 987         board_info->addr = addr;
 988         board_info->platform_data = platform_data;
 989         request_module(module_name);
 990         client = i2c_new_client_device(adap, board_info);
 991         if (!i2c_client_has_driver(client)) {
 992                 kfree(board_info);
 993                 return NULL;
 994         }
 995
 996         if (!try_module_get(client->dev.driver->owner)) {
 997                 i2c_unregister_device(client);
 998                 client = NULL;
 999         }
1000
1001         kfree(board_info);
1002         return client;
1003 }
1004 EXPORT_SYMBOL_GPL(dvb_module_probe);
1005
1006 void dvb_module_release(struct i2c_client *client)
1007 {
1008         if (!client)
1009                 return;
1010
1011         module_put(client->dev.driver->owner);
1012         i2c_unregister_device(client);
1013 }
1014 EXPORT_SYMBOL_GPL(dvb_module_release);
1015 #endif
1016
1017 static int dvb_uevent(struct device *dev, struct kobj_uevent_env *env)
1018 {
1019         struct dvb_device *dvbdev = dev_get_drvdata(dev);
1020
1021         add_uevent_var(env, "DVB_ADAPTER_NUM=%d", dvbdev->adapter->num);
1022         add_uevent_var(env, "DVB_DEVICE_TYPE=%s", dnames[dvbdev->type]);
1023         add_uevent_var(env, "DVB_DEVICE_NUM=%d", dvbdev->id);
1024         return 0;
1025 }
1026
1027 static char *dvb_devnode(struct device *dev, umode_t *mode)
1028 {
1029         struct dvb_device *dvbdev = dev_get_drvdata(dev);
1030
1031         return kasprintf(GFP_KERNEL, "dvb/adapter%d/%s%d",
1032                 dvbdev->adapter->num, dnames[dvbdev->type], dvbdev->id);
1033 }
1034
1035
1036 static int __init init_dvbdev(void)
1037 {
1038         int retval;
1039         dev_t dev = MKDEV(DVB_MAJOR, 0);
1040
1041         if ((retval = register_chrdev_region(dev, MAX_DVB_MINORS, "DVB")) != 0) {
1042                 pr_err("dvb-core: unable to get major %d\n", DVB_MAJOR);
1043                 return retval;
1044         }
1045
1046         cdev_init(&dvb_device_cdev, &dvb_device_fops);
1047         if ((retval = cdev_add(&dvb_device_cdev, dev, MAX_DVB_MINORS)) != 0) {
1048                 pr_err("dvb-core: unable register character device\n");
1049                 goto error;
1050         }
1051
1052         dvb_class = class_create(THIS_MODULE, "dvb");
1053         if (IS_ERR(dvb_class)) {
1054                 retval = PTR_ERR(dvb_class);
1055                 goto error;
1056         }
1057         dvb_class->dev_uevent = dvb_uevent;
1058         dvb_class->devnode = dvb_devnode;
1059         return 0;
1060
1061 error:
1062         cdev_del(&dvb_device_cdev);
1063         unregister_chrdev_region(dev, MAX_DVB_MINORS);
1064         return retval;
1065 }
1066
1067
1068 static void __exit exit_dvbdev(void)
1069 {
1070         class_destroy(dvb_class);
1071         cdev_del(&dvb_device_cdev);
1072         unregister_chrdev_region(MKDEV(DVB_MAJOR, 0), MAX_DVB_MINORS);
1073 }
1074
1075 subsys_initcall(init_dvbdev);
1076 module_exit(exit_dvbdev);
1077
1078 MODULE_DESCRIPTION("DVB Core Driver");
1079 MODULE_AUTHOR("Marcus Metzler, Ralph Metzler, Holger Waechtler");
1080 MODULE_LICENSE("GPL");