drivers/media/dvb-core/dvbdev.c

   1 /*
   2  * dvbdev.c
   3  *
   4  * Copyright (C) 2000 Ralph  Metzler <ralph@convergence.de>
   5  *                  & Marcus Metzler <marcus@convergence.de>
   6  *                    for convergence integrated media GmbH
   7  *
   8  * This program is free software; you can redistribute it and/or
   9  * modify it under the terms of the GNU Lesser General Public License
  10  * as published by the Free Software Foundation; either version 2.1
  11  * of the License, or (at your option) any later version.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  * GNU General Public License for more details.
  17  *
  18  */
  19
  20 #define pr_fmt(fmt) "dvbdev: " fmt
  21
  22 #include <linux/types.h>
  23 #include <linux/errno.h>
  24 #include <linux/string.h>
  25 #include <linux/module.h>
  26 #include <linux/kernel.h>
  27 #include <linux/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                 kfree(dvbdev->adapter->conn);
 245                 dvbdev->adapter->conn = NULL;
 246                 kfree(dvbdev->adapter->conn_pads);
 247                 dvbdev->adapter->conn_pads = NULL;
 248         }
 249 #endif
 250 }
 251
 252 #if defined(CONFIG_MEDIA_CONTROLLER_DVB)
 253 static int dvb_create_tsout_entity(struct dvb_device *dvbdev,
 254                                     const char *name, int npads)
 255 {
 256         int i, ret = 0;
 257
 258         dvbdev->tsout_pads = kcalloc(npads, sizeof(*dvbdev->tsout_pads),
 259                                      GFP_KERNEL);
 260         if (!dvbdev->tsout_pads)
 261                 return -ENOMEM;
 262
 263         dvbdev->tsout_entity = kcalloc(npads, sizeof(*dvbdev->tsout_entity),
 264                                        GFP_KERNEL);
 265         if (!dvbdev->tsout_entity)
 266                 return -ENOMEM;
 267
 268         dvbdev->tsout_num_entities = npads;
 269
 270         for (i = 0; i < npads; i++) {
 271                 struct media_pad *pads = &dvbdev->tsout_pads[i];
 272                 struct media_entity *entity = &dvbdev->tsout_entity[i];
 273
 274                 entity->name = kasprintf(GFP_KERNEL, "%s #%d", name, i);
 275                 if (!entity->name)
 276                         return -ENOMEM;
 277
 278                 entity->function = MEDIA_ENT_F_IO_DTV;
 279                 pads->flags = MEDIA_PAD_FL_SINK;
 280
 281                 ret = media_entity_pads_init(entity, 1, pads);
 282                 if (ret < 0)
 283                         return ret;
 284
 285                 ret = media_device_register_entity(dvbdev->adapter->mdev,
 286                                                    entity);
 287                 if (ret < 0)
 288                         return ret;
 289         }
 290         return 0;
 291 }
 292
 293 #define DEMUX_TSOUT     "demux-tsout"
 294 #define DVR_TSOUT       "dvr-tsout"
 295
 296 static int dvb_create_media_entity(struct dvb_device *dvbdev,
 297                                    int type, int demux_sink_pads)
 298 {
 299         int i, ret, npads;
 300
 301         switch (type) {
 302         case DVB_DEVICE_FRONTEND:
 303                 npads = 2;
 304                 break;
 305         case DVB_DEVICE_DVR:
 306                 ret = dvb_create_tsout_entity(dvbdev, DVR_TSOUT,
 307                                               demux_sink_pads);
 308                 return ret;
 309         case DVB_DEVICE_DEMUX:
 310                 npads = 1 + demux_sink_pads;
 311                 ret = dvb_create_tsout_entity(dvbdev, DEMUX_TSOUT,
 312                                               demux_sink_pads);
 313                 if (ret < 0)
 314                         return ret;
 315                 break;
 316         case DVB_DEVICE_CA:
 317                 npads = 2;
 318                 break;
 319         case DVB_DEVICE_NET:
 320                 /*
 321                  * We should be creating entities for the MPE/ULE
 322                  * decapsulation hardware (or software implementation).
 323                  *
 324                  * However, the number of for the MPE/ULE decaps may not be
 325                  * fixed. As we don't have yet dynamic support for PADs at
 326                  * the Media Controller, let's not create the decap
 327                  * entities yet.
 328                  */
 329                 return 0;
 330         default:
 331                 return 0;
 332         }
 333
 334         dvbdev->entity = kzalloc(sizeof(*dvbdev->entity), GFP_KERNEL);
 335         if (!dvbdev->entity)
 336                 return -ENOMEM;
 337
 338         dvbdev->entity->name = dvbdev->name;
 339
 340         if (npads) {
 341                 dvbdev->pads = kcalloc(npads, sizeof(*dvbdev->pads),
 342                                        GFP_KERNEL);
 343                 if (!dvbdev->pads) {
 344                         kfree(dvbdev->entity);
 345                         return -ENOMEM;
 346                 }
 347         }
 348
 349         switch (type) {
 350         case DVB_DEVICE_FRONTEND:
 351                 dvbdev->entity->function = MEDIA_ENT_F_DTV_DEMOD;
 352                 dvbdev->pads[0].flags = MEDIA_PAD_FL_SINK;
 353                 dvbdev->pads[1].flags = MEDIA_PAD_FL_SOURCE;
 354                 break;
 355         case DVB_DEVICE_DEMUX:
 356                 dvbdev->entity->function = MEDIA_ENT_F_TS_DEMUX;
 357                 dvbdev->pads[0].flags = MEDIA_PAD_FL_SINK;
 358                 for (i = 1; i < npads; i++)
 359                         dvbdev->pads[i].flags = MEDIA_PAD_FL_SOURCE;
 360                 break;
 361         case DVB_DEVICE_CA:
 362                 dvbdev->entity->function = MEDIA_ENT_F_DTV_CA;
 363                 dvbdev->pads[0].flags = MEDIA_PAD_FL_SINK;
 364                 dvbdev->pads[1].flags = MEDIA_PAD_FL_SOURCE;
 365                 break;
 366         default:
 367                 /* Should never happen, as the first switch prevents it */
 368                 kfree(dvbdev->entity);
 369                 kfree(dvbdev->pads);
 370                 dvbdev->entity = NULL;
 371                 dvbdev->pads = NULL;
 372                 return 0;
 373         }
 374
 375         if (npads) {
 376                 ret = media_entity_pads_init(dvbdev->entity, npads, dvbdev->pads);
 377                 if (ret)
 378                         return ret;
 379         }
 380         ret = media_device_register_entity(dvbdev->adapter->mdev,
 381                                            dvbdev->entity);
 382         if (ret)
 383                 return ret;
 384
 385         pr_info("%s: media entity '%s' registered.\n",
 386                 __func__, dvbdev->entity->name);
 387
 388         return 0;
 389 }
 390 #endif
 391
 392 static int dvb_register_media_device(struct dvb_device *dvbdev,
 393                                      int type, int minor,
 394                                      unsigned demux_sink_pads)
 395 {
 396 #if defined(CONFIG_MEDIA_CONTROLLER_DVB)
 397         struct media_link *link;
 398         u32 intf_type;
 399         int ret;
 400
 401         if (!dvbdev->adapter->mdev)
 402                 return 0;
 403
 404         ret = dvb_create_media_entity(dvbdev, type, demux_sink_pads);
 405         if (ret)
 406                 return ret;
 407
 408         switch (type) {
 409         case DVB_DEVICE_FRONTEND:
 410                 intf_type = MEDIA_INTF_T_DVB_FE;
 411                 break;
 412         case DVB_DEVICE_DEMUX:
 413                 intf_type = MEDIA_INTF_T_DVB_DEMUX;
 414                 break;
 415         case DVB_DEVICE_DVR:
 416                 intf_type = MEDIA_INTF_T_DVB_DVR;
 417                 break;
 418         case DVB_DEVICE_CA:
 419                 intf_type = MEDIA_INTF_T_DVB_CA;
 420                 break;
 421         case DVB_DEVICE_NET:
 422                 intf_type = MEDIA_INTF_T_DVB_NET;
 423                 break;
 424         default:
 425                 return 0;
 426         }
 427
 428         dvbdev->intf_devnode = media_devnode_create(dvbdev->adapter->mdev,
 429                                                     intf_type, 0,
 430                                                     DVB_MAJOR, minor);
 431
 432         if (!dvbdev->intf_devnode)
 433                 return -ENOMEM;
 434
 435         /*
 436          * Create the "obvious" link, e. g. the ones that represent
 437          * a direct association between an interface and an entity.
 438          * Other links should be created elsewhere, like:
 439          *              DVB FE intf    -> tuner
 440          *              DVB demux intf -> dvr
 441          */
 442
 443         if (!dvbdev->entity)
 444                 return 0;
 445
 446         link = media_create_intf_link(dvbdev->entity,
 447                                       &dvbdev->intf_devnode->intf,
 448                                       MEDIA_LNK_FL_ENABLED |
 449                                       MEDIA_LNK_FL_IMMUTABLE);
 450         if (!link)
 451                 return -ENOMEM;
 452 #endif
 453         return 0;
 454 }
 455
 456 int dvb_register_device(struct dvb_adapter *adap, struct dvb_device **pdvbdev,
 457                         const struct dvb_device *template, void *priv,
 458                         enum dvb_device_type type, int demux_sink_pads)
 459 {
 460         struct dvb_device *dvbdev;
 461         struct file_operations *dvbdevfops;
 462         struct device *clsdev;
 463         int minor;
 464         int id, ret;
 465
 466         mutex_lock(&dvbdev_register_lock);
 467
 468         if ((id = dvbdev_get_free_id (adap, type)) < 0){
 469                 mutex_unlock(&dvbdev_register_lock);
 470                 *pdvbdev = NULL;
 471                 pr_err("%s: couldn't find free device id\n", __func__);
 472                 return -ENFILE;
 473         }
 474
 475         *pdvbdev = dvbdev = kzalloc(sizeof(*dvbdev), GFP_KERNEL);
 476
 477         if (!dvbdev){
 478                 mutex_unlock(&dvbdev_register_lock);
 479                 return -ENOMEM;
 480         }
 481
 482         dvbdevfops = kmemdup(template->fops, sizeof(*dvbdevfops), GFP_KERNEL);
 483
 484         if (!dvbdevfops){
 485                 kfree (dvbdev);
 486                 mutex_unlock(&dvbdev_register_lock);
 487                 return -ENOMEM;
 488         }
 489
 490         memcpy(dvbdev, template, sizeof(struct dvb_device));
 491         dvbdev->type = type;
 492         dvbdev->id = id;
 493         dvbdev->adapter = adap;
 494         dvbdev->priv = priv;
 495         dvbdev->fops = dvbdevfops;
 496         init_waitqueue_head (&dvbdev->wait_queue);
 497
 498         dvbdevfops->owner = adap->module;
 499
 500         list_add_tail (&dvbdev->list_head, &adap->device_list);
 501
 502         down_write(&minor_rwsem);
 503 #ifdef CONFIG_DVB_DYNAMIC_MINORS
 504         for (minor = 0; minor < MAX_DVB_MINORS; minor++)
 505                 if (dvb_minors[minor] == NULL)
 506                         break;
 507
 508         if (minor == MAX_DVB_MINORS) {
 509                 kfree(dvbdevfops);
 510                 kfree(dvbdev);
 511                 up_write(&minor_rwsem);
 512                 mutex_unlock(&dvbdev_register_lock);
 513                 return -EINVAL;
 514         }
 515 #else
 516         minor = nums2minor(adap->num, type, id);
 517 #endif
 518
 519         dvbdev->minor = minor;
 520         dvb_minors[minor] = dvbdev;
 521         up_write(&minor_rwsem);
 522
 523         ret = dvb_register_media_device(dvbdev, type, minor, demux_sink_pads);
 524         if (ret) {
 525                 pr_err("%s: dvb_register_media_device failed to create the mediagraph\n",
 526                       __func__);
 527
 528                 dvb_media_device_free(dvbdev);
 529                 kfree(dvbdevfops);
 530                 kfree(dvbdev);
 531                 mutex_unlock(&dvbdev_register_lock);
 532                 return ret;
 533         }
 534
 535         mutex_unlock(&dvbdev_register_lock);
 536
 537         clsdev = device_create(dvb_class, adap->device,
 538                                MKDEV(DVB_MAJOR, minor),
 539                                dvbdev, "dvb%d.%s%d", adap->num, dnames[type], id);
 540         if (IS_ERR(clsdev)) {
 541                 pr_err("%s: failed to create device dvb%d.%s%d (%ld)\n",
 542                        __func__, adap->num, dnames[type], id, PTR_ERR(clsdev));
 543                 return PTR_ERR(clsdev);
 544         }
 545         dprintk("DVB: register adapter%d/%s%d @ minor: %i (0x%02x)\n",
 546                 adap->num, dnames[type], id, minor, minor);
 547
 548         return 0;
 549 }
 550 EXPORT_SYMBOL(dvb_register_device);
 551
 552
 553 void dvb_remove_device(struct dvb_device *dvbdev)
 554 {
 555         if (!dvbdev)
 556                 return;
 557
 558         down_write(&minor_rwsem);
 559         dvb_minors[dvbdev->minor] = NULL;
 560         up_write(&minor_rwsem);
 561
 562         dvb_media_device_free(dvbdev);
 563
 564         device_destroy(dvb_class, MKDEV(DVB_MAJOR, dvbdev->minor));
 565
 566         list_del (&dvbdev->list_head);
 567 }
 568 EXPORT_SYMBOL(dvb_remove_device);
 569
 570
 571 void dvb_free_device(struct dvb_device *dvbdev)
 572 {
 573         if (!dvbdev)
 574                 return;
 575
 576         kfree (dvbdev->fops);
 577         kfree (dvbdev);
 578 }
 579 EXPORT_SYMBOL(dvb_free_device);
 580
 581
 582 void dvb_unregister_device(struct dvb_device *dvbdev)
 583 {
 584         dvb_remove_device(dvbdev);
 585         dvb_free_device(dvbdev);
 586 }
 587 EXPORT_SYMBOL(dvb_unregister_device);
 588
 589
 590 #ifdef CONFIG_MEDIA_CONTROLLER_DVB
 591
 592 static int dvb_create_io_intf_links(struct dvb_adapter *adap,
 593                                     struct media_interface *intf,
 594                                     char *name)
 595 {
 596         struct media_device *mdev = adap->mdev;
 597         struct media_entity *entity;
 598         struct media_link *link;
 599
 600         media_device_for_each_entity(entity, mdev) {
 601                 if (entity->function == MEDIA_ENT_F_IO_DTV) {
 602                         if (strncmp(entity->name, name, strlen(name)))
 603                                 continue;
 604                         link = media_create_intf_link(entity, intf,
 605                                                       MEDIA_LNK_FL_ENABLED |
 606                                                       MEDIA_LNK_FL_IMMUTABLE);
 607                         if (!link)
 608                                 return -ENOMEM;
 609                 }
 610         }
 611         return 0;
 612 }
 613
 614 int dvb_create_media_graph(struct dvb_adapter *adap,
 615                            bool create_rf_connector)
 616 {
 617         struct media_device *mdev = adap->mdev;
 618         struct media_entity *entity, *tuner = NULL, *demod = NULL, *conn;
 619         struct media_entity *demux = NULL, *ca = NULL;
 620         struct media_link *link;
 621         struct media_interface *intf;
 622         unsigned demux_pad = 0;
 623         unsigned dvr_pad = 0;
 624         unsigned ntuner = 0, ndemod = 0;
 625         int ret, pad_source, pad_sink;
 626         static const char *connector_name = "Television";
 627
 628         if (!mdev)
 629                 return 0;
 630
 631         media_device_for_each_entity(entity, mdev) {
 632                 switch (entity->function) {
 633                 case MEDIA_ENT_F_TUNER:
 634                         tuner = entity;
 635                         ntuner++;
 636                         break;
 637                 case MEDIA_ENT_F_DTV_DEMOD:
 638                         demod = entity;
 639                         ndemod++;
 640                         break;
 641                 case MEDIA_ENT_F_TS_DEMUX:
 642                         demux = entity;
 643                         break;
 644                 case MEDIA_ENT_F_DTV_CA:
 645                         ca = entity;
 646                         break;
 647                 }
 648         }
 649
 650         /*
 651          * Prepare to signalize to media_create_pad_links() that multiple
 652          * entities of the same type exists and a 1:n or n:1 links need to be
 653          * created.
 654          * NOTE: if both tuner and demod have multiple instances, it is up
 655          * to the caller driver to create such links.
 656          */
 657         if (ntuner > 1)
 658                 tuner = NULL;
 659         if (ndemod > 1)
 660                 demod = NULL;
 661
 662         if (create_rf_connector) {
 663                 conn = kzalloc(sizeof(*conn), GFP_KERNEL);
 664                 if (!conn)
 665                         return -ENOMEM;
 666                 adap->conn = conn;
 667
 668                 adap->conn_pads = kzalloc(sizeof(*adap->conn_pads), GFP_KERNEL);
 669                 if (!adap->conn_pads)
 670                         return -ENOMEM;
 671
 672                 conn->flags = MEDIA_ENT_FL_CONNECTOR;
 673                 conn->function = MEDIA_ENT_F_CONN_RF;
 674                 conn->name = connector_name;
 675                 adap->conn_pads->flags = MEDIA_PAD_FL_SOURCE;
 676
 677                 ret = media_entity_pads_init(conn, 1, adap->conn_pads);
 678                 if (ret)
 679                         return ret;
 680
 681                 ret = media_device_register_entity(mdev, conn);
 682                 if (ret)
 683                         return ret;
 684
 685                 if (!ntuner) {
 686                         ret = media_create_pad_links(mdev,
 687                                                      MEDIA_ENT_F_CONN_RF,
 688                                                      conn, 0,
 689                                                      MEDIA_ENT_F_DTV_DEMOD,
 690                                                      demod, 0,
 691                                                      MEDIA_LNK_FL_ENABLED,
 692                                                      false);
 693                 } else {
 694                         pad_sink = media_get_pad_index(tuner, true,
 695                                                        PAD_SIGNAL_ANALOG);
 696                         if (pad_sink < 0)
 697                                 return -EINVAL;
 698                         ret = media_create_pad_links(mdev,
 699                                                      MEDIA_ENT_F_CONN_RF,
 700                                                      conn, 0,
 701                                                      MEDIA_ENT_F_TUNER,
 702                                                      tuner, pad_sink,
 703                                                      MEDIA_LNK_FL_ENABLED,
 704                                                      false);
 705                 }
 706                 if (ret)
 707                         return ret;
 708         }
 709
 710         if (ntuner && ndemod) {
 711                 /* NOTE: first found tuner source pad presumed correct */
 712                 pad_source = media_get_pad_index(tuner, false,
 713                                                  PAD_SIGNAL_ANALOG);
 714                 if (pad_source < 0)
 715                         return -EINVAL;
 716                 ret = media_create_pad_links(mdev,
 717                                              MEDIA_ENT_F_TUNER,
 718                                              tuner, pad_source,
 719                                              MEDIA_ENT_F_DTV_DEMOD,
 720                                              demod, 0, MEDIA_LNK_FL_ENABLED,
 721                                              false);
 722                 if (ret)
 723                         return ret;
 724         }
 725
 726         if (ndemod && demux) {
 727                 ret = media_create_pad_links(mdev,
 728                                              MEDIA_ENT_F_DTV_DEMOD,
 729                                              demod, 1,
 730                                              MEDIA_ENT_F_TS_DEMUX,
 731                                              demux, 0, MEDIA_LNK_FL_ENABLED,
 732                                              false);
 733                 if (ret)
 734                         return ret;
 735         }
 736         if (demux && ca) {
 737                 ret = media_create_pad_link(demux, 1, ca,
 738                                             0, MEDIA_LNK_FL_ENABLED);
 739                 if (ret)
 740                         return ret;
 741         }
 742
 743         /* Create demux links for each ringbuffer/pad */
 744         if (demux) {
 745                 media_device_for_each_entity(entity, mdev) {
 746                         if (entity->function == MEDIA_ENT_F_IO_DTV) {
 747                                 if (!strncmp(entity->name, DVR_TSOUT,
 748                                     strlen(DVR_TSOUT))) {
 749                                         ret = media_create_pad_link(demux,
 750                                                                 ++dvr_pad,
 751                                                             entity, 0, 0);
 752                                         if (ret)
 753                                                 return ret;
 754                                 }
 755                                 if (!strncmp(entity->name, DEMUX_TSOUT,
 756                                     strlen(DEMUX_TSOUT))) {
 757                                         ret = media_create_pad_link(demux,
 758                                                               ++demux_pad,
 759                                                             entity, 0, 0);
 760                                         if (ret)
 761                                                 return ret;
 762                                 }
 763                         }
 764                 }
 765         }
 766
 767         /* Create interface links for FE->tuner, DVR->demux and CA->ca */
 768         media_device_for_each_intf(intf, mdev) {
 769                 if (intf->type == MEDIA_INTF_T_DVB_CA && ca) {
 770                         link = media_create_intf_link(ca, intf,
 771                                                       MEDIA_LNK_FL_ENABLED |
 772                                                       MEDIA_LNK_FL_IMMUTABLE);
 773                         if (!link)
 774                                 return -ENOMEM;
 775                 }
 776
 777                 if (intf->type == MEDIA_INTF_T_DVB_FE && tuner) {
 778                         link = media_create_intf_link(tuner, intf,
 779                                                       MEDIA_LNK_FL_ENABLED |
 780                                                       MEDIA_LNK_FL_IMMUTABLE);
 781                         if (!link)
 782                                 return -ENOMEM;
 783                 }
 784 #if 0
 785                 /*
 786                  * Indirect link - let's not create yet, as we don't know how
 787                  *                 to handle indirect links, nor if this will
 788                  *                 actually be needed.
 789                  */
 790                 if (intf->type == MEDIA_INTF_T_DVB_DVR && demux) {
 791                         link = media_create_intf_link(demux, intf,
 792                                                       MEDIA_LNK_FL_ENABLED |
 793                                                       MEDIA_LNK_FL_IMMUTABLE);
 794                         if (!link)
 795                                 return -ENOMEM;
 796                 }
 797 #endif
 798                 if (intf->type == MEDIA_INTF_T_DVB_DVR) {
 799                         ret = dvb_create_io_intf_links(adap, intf, DVR_TSOUT);
 800                         if (ret)
 801                                 return ret;
 802                 }
 803                 if (intf->type == MEDIA_INTF_T_DVB_DEMUX) {
 804                         ret = dvb_create_io_intf_links(adap, intf, DEMUX_TSOUT);
 805                         if (ret)
 806                                 return ret;
 807                 }
 808         }
 809         return 0;
 810 }
 811 EXPORT_SYMBOL_GPL(dvb_create_media_graph);
 812 #endif
 813
 814 static int dvbdev_check_free_adapter_num(int num)
 815 {
 816         struct list_head *entry;
 817         list_for_each(entry, &dvb_adapter_list) {
 818                 struct dvb_adapter *adap;
 819                 adap = list_entry(entry, struct dvb_adapter, list_head);
 820                 if (adap->num == num)
 821                         return 0;
 822         }
 823         return 1;
 824 }
 825
 826 static int dvbdev_get_free_adapter_num (void)
 827 {
 828         int num = 0;
 829
 830         while (num < DVB_MAX_ADAPTERS) {
 831                 if (dvbdev_check_free_adapter_num(num))
 832                         return num;
 833                 num++;
 834         }
 835
 836         return -ENFILE;
 837 }
 838
 839
 840 int dvb_register_adapter(struct dvb_adapter *adap, const char *name,
 841                          struct module *module, struct device *device,
 842                          short *adapter_nums)
 843 {
 844         int i, num;
 845
 846         mutex_lock(&dvbdev_register_lock);
 847
 848         for (i = 0; i < DVB_MAX_ADAPTERS; ++i) {
 849                 num = adapter_nums[i];
 850                 if (num >= 0  &&  num < DVB_MAX_ADAPTERS) {
 851                 /* use the one the driver asked for */
 852                         if (dvbdev_check_free_adapter_num(num))
 853                                 break;
 854                 } else {
 855                         num = dvbdev_get_free_adapter_num();
 856                         break;
 857                 }
 858                 num = -1;
 859         }
 860
 861         if (num < 0) {
 862                 mutex_unlock(&dvbdev_register_lock);
 863                 return -ENFILE;
 864         }
 865
 866         memset (adap, 0, sizeof(struct dvb_adapter));
 867         INIT_LIST_HEAD (&adap->device_list);
 868
 869         pr_info("DVB: registering new adapter (%s)\n", name);
 870
 871         adap->num = num;
 872         adap->name = name;
 873         adap->module = module;
 874         adap->device = device;
 875         adap->mfe_shared = 0;
 876         adap->mfe_dvbdev = NULL;
 877         mutex_init (&adap->mfe_lock);
 878
 879 #ifdef CONFIG_MEDIA_CONTROLLER_DVB
 880         mutex_init(&adap->mdev_lock);
 881 #endif
 882
 883         list_add_tail (&adap->list_head, &dvb_adapter_list);
 884
 885         mutex_unlock(&dvbdev_register_lock);
 886
 887         return num;
 888 }
 889 EXPORT_SYMBOL(dvb_register_adapter);
 890
 891
 892 int dvb_unregister_adapter(struct dvb_adapter *adap)
 893 {
 894         mutex_lock(&dvbdev_register_lock);
 895         list_del (&adap->list_head);
 896         mutex_unlock(&dvbdev_register_lock);
 897         return 0;
 898 }
 899 EXPORT_SYMBOL(dvb_unregister_adapter);
 900
 901 /* if the miracle happens and "generic_usercopy()" is included into
 902    the kernel, then this can vanish. please don't make the mistake and
 903    define this as video_usercopy(). this will introduce a dependency
 904    to the v4l "videodev.o" module, which is unnecessary for some
 905    cards (ie. the budget dvb-cards don't need the v4l module...) */
 906 int dvb_usercopy(struct file *file,
 907                      unsigned int cmd, unsigned long arg,
 908                      int (*func)(struct file *file,
 909                      unsigned int cmd, void *arg))
 910 {
 911         char    sbuf[128];
 912         void    *mbuf = NULL;
 913         void    *parg = NULL;
 914         int     err  = -EINVAL;
 915
 916         /*  Copy arguments into temp kernel buffer  */
 917         switch (_IOC_DIR(cmd)) {
 918         case _IOC_NONE:
 919                 /*
 920                  * For this command, the pointer is actually an integer
 921                  * argument.
 922                  */
 923                 parg = (void *) arg;
 924                 break;
 925         case _IOC_READ: /* some v4l ioctls are marked wrong ... */
 926         case _IOC_WRITE:
 927         case (_IOC_WRITE | _IOC_READ):
 928                 if (_IOC_SIZE(cmd) <= sizeof(sbuf)) {
 929                         parg = sbuf;
 930                 } else {
 931                         /* too big to allocate from stack */
 932                         mbuf = kmalloc(_IOC_SIZE(cmd), GFP_KERNEL);
 933                         if (NULL == mbuf)
 934                                 return -ENOMEM;
 935                         parg = mbuf;
 936                 }
 937
 938                 err = -EFAULT;
 939                 if (copy_from_user(parg, (void __user *)arg, _IOC_SIZE(cmd)))
 940                         goto out;
 941                 break;
 942         }
 943
 944         /* call driver */
 945         if ((err = func(file, cmd, parg)) == -ENOIOCTLCMD)
 946                 err = -ENOTTY;
 947
 948         if (err < 0)
 949                 goto out;
 950
 951         /*  Copy results into user buffer  */
 952         switch (_IOC_DIR(cmd))
 953         {
 954         case _IOC_READ:
 955         case (_IOC_WRITE | _IOC_READ):
 956                 if (copy_to_user((void __user *)arg, parg, _IOC_SIZE(cmd)))
 957                         err = -EFAULT;
 958                 break;
 959         }
 960
 961 out:
 962         kfree(mbuf);
 963         return err;
 964 }
 965
 966 #if IS_ENABLED(CONFIG_I2C)
 967 struct i2c_client *dvb_module_probe(const char *module_name,
 968                                     const char *name,
 969                                     struct i2c_adapter *adap,
 970                                     unsigned char addr,
 971                                     void *platform_data)
 972 {
 973         struct i2c_client *client;
 974         struct i2c_board_info *board_info;
 975
 976         board_info = kzalloc(sizeof(*board_info), GFP_KERNEL);
 977         if (!board_info)
 978                 return NULL;
 979
 980         if (name)
 981                 strscpy(board_info->type, name, I2C_NAME_SIZE);
 982         else
 983                 strscpy(board_info->type, module_name, I2C_NAME_SIZE);
 984
 985         board_info->addr = addr;
 986         board_info->platform_data = platform_data;
 987         request_module(module_name);
 988         client = i2c_new_client_device(adap, board_info);
 989         if (!i2c_client_has_driver(client)) {
 990                 kfree(board_info);
 991                 return NULL;
 992         }
 993
 994         if (!try_module_get(client->dev.driver->owner)) {
 995                 i2c_unregister_device(client);
 996                 client = NULL;
 997         }
 998
 999         kfree(board_info);
1000         return client;
1001 }
1002 EXPORT_SYMBOL_GPL(dvb_module_probe);
1003
1004 void dvb_module_release(struct i2c_client *client)
1005 {
1006         if (!client)
1007                 return;
1008
1009         module_put(client->dev.driver->owner);
1010         i2c_unregister_device(client);
1011 }
1012 EXPORT_SYMBOL_GPL(dvb_module_release);
1013 #endif
1014
1015 static int dvb_uevent(struct device *dev, struct kobj_uevent_env *env)
1016 {
1017         struct dvb_device *dvbdev = dev_get_drvdata(dev);
1018
1019         add_uevent_var(env, "DVB_ADAPTER_NUM=%d", dvbdev->adapter->num);
1020         add_uevent_var(env, "DVB_DEVICE_TYPE=%s", dnames[dvbdev->type]);
1021         add_uevent_var(env, "DVB_DEVICE_NUM=%d", dvbdev->id);
1022         return 0;
1023 }
1024
1025 static char *dvb_devnode(struct device *dev, umode_t *mode)
1026 {
1027         struct dvb_device *dvbdev = dev_get_drvdata(dev);
1028
1029         return kasprintf(GFP_KERNEL, "dvb/adapter%d/%s%d",
1030                 dvbdev->adapter->num, dnames[dvbdev->type], dvbdev->id);
1031 }
1032
1033
1034 static int __init init_dvbdev(void)
1035 {
1036         int retval;
1037         dev_t dev = MKDEV(DVB_MAJOR, 0);
1038
1039         if ((retval = register_chrdev_region(dev, MAX_DVB_MINORS, "DVB")) != 0) {
1040                 pr_err("dvb-core: unable to get major %d\n", DVB_MAJOR);
1041                 return retval;
1042         }
1043
1044         cdev_init(&dvb_device_cdev, &dvb_device_fops);
1045         if ((retval = cdev_add(&dvb_device_cdev, dev, MAX_DVB_MINORS)) != 0) {
1046                 pr_err("dvb-core: unable register character device\n");
1047                 goto error;
1048         }
1049
1050         dvb_class = class_create(THIS_MODULE, "dvb");
1051         if (IS_ERR(dvb_class)) {
1052                 retval = PTR_ERR(dvb_class);
1053                 goto error;
1054         }
1055         dvb_class->dev_uevent = dvb_uevent;
1056         dvb_class->devnode = dvb_devnode;
1057         return 0;
1058
1059 error:
1060         cdev_del(&dvb_device_cdev);
1061         unregister_chrdev_region(dev, MAX_DVB_MINORS);
1062         return retval;
1063 }
1064
1065
1066 static void __exit exit_dvbdev(void)
1067 {
1068         class_destroy(dvb_class);
1069         cdev_del(&dvb_device_cdev);
1070         unregister_chrdev_region(MKDEV(DVB_MAJOR, 0), MAX_DVB_MINORS);
1071 }
1072
1073 subsys_initcall(init_dvbdev);
1074 module_exit(exit_dvbdev);
1075
1076 MODULE_DESCRIPTION("DVB Core Driver");
1077 MODULE_AUTHOR("Marcus Metzler, Ralph Metzler, Holger Waechtler");
1078 MODULE_LICENSE("GPL");