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  * You should have received a copy of the GNU Lesser General Public License
  19  * along with this program; if not, write to the Free Software
  20  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
  21  *
  22  */
  23
  24 #define pr_fmt(fmt) "dvbdev: " fmt
  25
  26 #include <linux/types.h>
  27 #include <linux/errno.h>
  28 #include <linux/string.h>
  29 #include <linux/module.h>
  30 #include <linux/kernel.h>
  31 #include <linux/init.h>
  32 #include <linux/slab.h>
  33 #include <linux/device.h>
  34 #include <linux/fs.h>
  35 #include <linux/cdev.h>
  36 #include <linux/mutex.h>
  37 #include "dvbdev.h"
  38
  39 /* Due to enum tuner_pad_index */
  40 #include <media/tuner.h>
  41
  42 static DEFINE_MUTEX(dvbdev_mutex);
  43 static int dvbdev_debug;
  44
  45 module_param(dvbdev_debug, int, 0644);
  46 MODULE_PARM_DESC(dvbdev_debug, "Turn on/off device debugging (default:off).");
  47
  48 #define dprintk(fmt, arg...) do {                                       \
  49         if (dvbdev_debug)                                               \
  50                 printk(KERN_DEBUG pr_fmt("%s: " fmt),                   \
  51                        __func__, ##arg);                                \
  52 } while (0)
  53
  54 static LIST_HEAD(dvb_adapter_list);
  55 static DEFINE_MUTEX(dvbdev_register_lock);
  56
  57 static const char * const dnames[] = {
  58         "video", "audio", "sec", "frontend", "demux", "dvr", "ca",
  59         "net", "osd"
  60 };
  61
  62 #ifdef CONFIG_DVB_DYNAMIC_MINORS
  63 #define MAX_DVB_MINORS          256
  64 #define DVB_MAX_IDS             MAX_DVB_MINORS
  65 #else
  66 #define DVB_MAX_IDS             4
  67 #define nums2minor(num, type, id)       ((num << 6) | (id << 4) | type)
  68 #define MAX_DVB_MINORS          (DVB_MAX_ADAPTERS*64)
  69 #endif
  70
  71 static struct class *dvb_class;
  72
  73 static struct dvb_device *dvb_minors[MAX_DVB_MINORS];
  74 static DECLARE_RWSEM(minor_rwsem);
  75
  76 static int dvb_device_open(struct inode *inode, struct file *file)
  77 {
  78         struct dvb_device *dvbdev;
  79
  80         mutex_lock(&dvbdev_mutex);
  81         down_read(&minor_rwsem);
  82         dvbdev = dvb_minors[iminor(inode)];
  83
  84         if (dvbdev && dvbdev->fops) {
  85                 int err = 0;
  86                 const struct file_operations *new_fops;
  87
  88                 new_fops = fops_get(dvbdev->fops);
  89                 if (!new_fops)
  90                         goto fail;
  91                 file->private_data = dvbdev;
  92                 replace_fops(file, new_fops);
  93                 if (file->f_op->open)
  94                         err = file->f_op->open(inode, file);
  95                 up_read(&minor_rwsem);
  96                 mutex_unlock(&dvbdev_mutex);
  97                 return err;
  98         }
  99 fail:
 100         up_read(&minor_rwsem);
 101         mutex_unlock(&dvbdev_mutex);
 102         return -ENODEV;
 103 }
 104
 105
 106 static const struct file_operations dvb_device_fops =
 107 {
 108         .owner =        THIS_MODULE,
 109         .open =         dvb_device_open,
 110         .llseek =       noop_llseek,
 111 };
 112
 113 static struct cdev dvb_device_cdev;
 114
 115 int dvb_generic_open(struct inode *inode, struct file *file)
 116 {
 117         struct dvb_device *dvbdev = file->private_data;
 118
 119         if (!dvbdev)
 120                 return -ENODEV;
 121
 122         if (!dvbdev->users)
 123                 return -EBUSY;
 124
 125         if ((file->f_flags & O_ACCMODE) == O_RDONLY) {
 126                 if (!dvbdev->readers)
 127                         return -EBUSY;
 128                 dvbdev->readers--;
 129         } else {
 130                 if (!dvbdev->writers)
 131                         return -EBUSY;
 132                 dvbdev->writers--;
 133         }
 134
 135         dvbdev->users--;
 136         return 0;
 137 }
 138 EXPORT_SYMBOL(dvb_generic_open);
 139
 140
 141 int dvb_generic_release(struct inode *inode, struct file *file)
 142 {
 143         struct dvb_device *dvbdev = file->private_data;
 144
 145         if (!dvbdev)
 146                 return -ENODEV;
 147
 148         if ((file->f_flags & O_ACCMODE) == O_RDONLY) {
 149                 dvbdev->readers++;
 150         } else {
 151                 dvbdev->writers++;
 152         }
 153
 154         dvbdev->users++;
 155         return 0;
 156 }
 157 EXPORT_SYMBOL(dvb_generic_release);
 158
 159
 160 long dvb_generic_ioctl(struct file *file,
 161                        unsigned int cmd, unsigned long arg)
 162 {
 163         struct dvb_device *dvbdev = file->private_data;
 164
 165         if (!dvbdev)
 166                 return -ENODEV;
 167
 168         if (!dvbdev->kernel_ioctl)
 169                 return -EINVAL;
 170
 171         return dvb_usercopy(file, cmd, arg, dvbdev->kernel_ioctl);
 172 }
 173 EXPORT_SYMBOL(dvb_generic_ioctl);
 174
 175
 176 static int dvbdev_get_free_id (struct dvb_adapter *adap, int type)
 177 {
 178         u32 id = 0;
 179
 180         while (id < DVB_MAX_IDS) {
 181                 struct dvb_device *dev;
 182                 list_for_each_entry(dev, &adap->device_list, list_head)
 183                         if (dev->type == type && dev->id == id)
 184                                 goto skip;
 185                 return id;
 186 skip:
 187                 id++;
 188         }
 189         return -ENFILE;
 190 }
 191
 192 static void dvb_media_device_free(struct dvb_device *dvbdev)
 193 {
 194 #if defined(CONFIG_MEDIA_CONTROLLER_DVB)
 195         if (dvbdev->entity) {
 196                 media_device_unregister_entity(dvbdev->entity);
 197                 kfree(dvbdev->entity);
 198                 kfree(dvbdev->pads);
 199                 dvbdev->entity = NULL;
 200                 dvbdev->pads = NULL;
 201         }
 202
 203         if (dvbdev->tsout_entity) {
 204                 int i;
 205
 206                 for (i = 0; i < dvbdev->tsout_num_entities; i++) {
 207                         media_device_unregister_entity(&dvbdev->tsout_entity[i]);
 208                         kfree(dvbdev->tsout_entity[i].name);
 209                 }
 210                 kfree(dvbdev->tsout_entity);
 211                 kfree(dvbdev->tsout_pads);
 212                 dvbdev->tsout_entity = NULL;
 213                 dvbdev->tsout_pads = NULL;
 214
 215                 dvbdev->tsout_num_entities = 0;
 216         }
 217
 218         if (dvbdev->intf_devnode) {
 219                 media_devnode_remove(dvbdev->intf_devnode);
 220                 dvbdev->intf_devnode = NULL;
 221         }
 222
 223         if (dvbdev->adapter->conn) {
 224                 media_device_unregister_entity(dvbdev->adapter->conn);
 225                 dvbdev->adapter->conn = NULL;
 226                 kfree(dvbdev->adapter->conn_pads);
 227                 dvbdev->adapter->conn_pads = NULL;
 228         }
 229 #endif
 230 }
 231
 232 #if defined(CONFIG_MEDIA_CONTROLLER_DVB)
 233 static int dvb_create_tsout_entity(struct dvb_device *dvbdev,
 234                                     const char *name, int npads)
 235 {
 236         int i, ret = 0;
 237
 238         dvbdev->tsout_pads = kcalloc(npads, sizeof(*dvbdev->tsout_pads),
 239                                      GFP_KERNEL);
 240         if (!dvbdev->tsout_pads)
 241                 return -ENOMEM;
 242
 243         dvbdev->tsout_entity = kcalloc(npads, sizeof(*dvbdev->tsout_entity),
 244                                        GFP_KERNEL);
 245         if (!dvbdev->tsout_entity)
 246                 return -ENOMEM;
 247
 248         dvbdev->tsout_num_entities = npads;
 249
 250         for (i = 0; i < npads; i++) {
 251                 struct media_pad *pads = &dvbdev->tsout_pads[i];
 252                 struct media_entity *entity = &dvbdev->tsout_entity[i];
 253
 254                 entity->name = kasprintf(GFP_KERNEL, "%s #%d", name, i);
 255                 if (!entity->name)
 256                         return -ENOMEM;
 257
 258                 entity->function = MEDIA_ENT_F_IO_DTV;
 259                 pads->flags = MEDIA_PAD_FL_SINK;
 260
 261                 ret = media_entity_pads_init(entity, 1, pads);
 262                 if (ret < 0)
 263                         return ret;
 264
 265                 ret = media_device_register_entity(dvbdev->adapter->mdev,
 266                                                    entity);
 267                 if (ret < 0)
 268                         return ret;
 269         }
 270         return 0;
 271 }
 272
 273 #define DEMUX_TSOUT     "demux-tsout"
 274 #define DVR_TSOUT       "dvr-tsout"
 275
 276 static int dvb_create_media_entity(struct dvb_device *dvbdev,
 277                                    int type, int demux_sink_pads)
 278 {
 279         int i, ret, npads;
 280
 281         switch (type) {
 282         case DVB_DEVICE_FRONTEND:
 283                 npads = 2;
 284                 break;
 285         case DVB_DEVICE_DVR:
 286                 ret = dvb_create_tsout_entity(dvbdev, DVR_TSOUT,
 287                                               demux_sink_pads);
 288                 return ret;
 289         case DVB_DEVICE_DEMUX:
 290                 npads = 1 + demux_sink_pads;
 291                 ret = dvb_create_tsout_entity(dvbdev, DEMUX_TSOUT,
 292                                               demux_sink_pads);
 293                 if (ret < 0)
 294                         return ret;
 295                 break;
 296         case DVB_DEVICE_CA:
 297                 npads = 2;
 298                 break;
 299         case DVB_DEVICE_NET:
 300                 /*
 301                  * We should be creating entities for the MPE/ULE
 302                  * decapsulation hardware (or software implementation).
 303                  *
 304                  * However, the number of for the MPE/ULE decaps may not be
 305                  * fixed. As we don't have yet dynamic support for PADs at
 306                  * the Media Controller, let's not create the decap
 307                  * entities yet.
 308                  */
 309                 return 0;
 310         default:
 311                 return 0;
 312         }
 313
 314         dvbdev->entity = kzalloc(sizeof(*dvbdev->entity), GFP_KERNEL);
 315         if (!dvbdev->entity)
 316                 return -ENOMEM;
 317
 318         dvbdev->entity->name = dvbdev->name;
 319
 320         if (npads) {
 321                 dvbdev->pads = kcalloc(npads, sizeof(*dvbdev->pads),
 322                                        GFP_KERNEL);
 323                 if (!dvbdev->pads)
 324                         return -ENOMEM;
 325         }
 326
 327         switch (type) {
 328         case DVB_DEVICE_FRONTEND:
 329                 dvbdev->entity->function = MEDIA_ENT_F_DTV_DEMOD;
 330                 dvbdev->pads[0].flags = MEDIA_PAD_FL_SINK;
 331                 dvbdev->pads[1].flags = MEDIA_PAD_FL_SOURCE;
 332                 break;
 333         case DVB_DEVICE_DEMUX:
 334                 dvbdev->entity->function = MEDIA_ENT_F_TS_DEMUX;
 335                 dvbdev->pads[0].flags = MEDIA_PAD_FL_SINK;
 336                 for (i = 1; i < npads; i++)
 337                         dvbdev->pads[i].flags = MEDIA_PAD_FL_SOURCE;
 338                 break;
 339         case DVB_DEVICE_CA:
 340                 dvbdev->entity->function = MEDIA_ENT_F_DTV_CA;
 341                 dvbdev->pads[0].flags = MEDIA_PAD_FL_SINK;
 342                 dvbdev->pads[1].flags = MEDIA_PAD_FL_SOURCE;
 343                 break;
 344         default:
 345                 /* Should never happen, as the first switch prevents it */
 346                 kfree(dvbdev->entity);
 347                 kfree(dvbdev->pads);
 348                 dvbdev->entity = NULL;
 349                 dvbdev->pads = NULL;
 350                 return 0;
 351         }
 352
 353         if (npads) {
 354                 ret = media_entity_pads_init(dvbdev->entity, npads, dvbdev->pads);
 355                 if (ret)
 356                         return ret;
 357         }
 358         ret = media_device_register_entity(dvbdev->adapter->mdev,
 359                                            dvbdev->entity);
 360         if (ret)
 361                 return ret;
 362
 363         pr_info("%s: media entity '%s' registered.\n",
 364                 __func__, dvbdev->entity->name);
 365
 366         return 0;
 367 }
 368 #endif
 369
 370 static int dvb_register_media_device(struct dvb_device *dvbdev,
 371                                      int type, int minor,
 372                                      unsigned demux_sink_pads)
 373 {
 374 #if defined(CONFIG_MEDIA_CONTROLLER_DVB)
 375         struct media_link *link;
 376         u32 intf_type;
 377         int ret;
 378
 379         if (!dvbdev->adapter->mdev)
 380                 return 0;
 381
 382         ret = dvb_create_media_entity(dvbdev, type, demux_sink_pads);
 383         if (ret)
 384                 return ret;
 385
 386         switch (type) {
 387         case DVB_DEVICE_FRONTEND:
 388                 intf_type = MEDIA_INTF_T_DVB_FE;
 389                 break;
 390         case DVB_DEVICE_DEMUX:
 391                 intf_type = MEDIA_INTF_T_DVB_DEMUX;
 392                 break;
 393         case DVB_DEVICE_DVR:
 394                 intf_type = MEDIA_INTF_T_DVB_DVR;
 395                 break;
 396         case DVB_DEVICE_CA:
 397                 intf_type = MEDIA_INTF_T_DVB_CA;
 398                 break;
 399         case DVB_DEVICE_NET:
 400                 intf_type = MEDIA_INTF_T_DVB_NET;
 401                 break;
 402         default:
 403                 return 0;
 404         }
 405
 406         dvbdev->intf_devnode = media_devnode_create(dvbdev->adapter->mdev,
 407                                                     intf_type, 0,
 408                                                     DVB_MAJOR, minor);
 409
 410         if (!dvbdev->intf_devnode)
 411                 return -ENOMEM;
 412
 413         /*
 414          * Create the "obvious" link, e. g. the ones that represent
 415          * a direct association between an interface and an entity.
 416          * Other links should be created elsewhere, like:
 417          *              DVB FE intf    -> tuner
 418          *              DVB demux intf -> dvr
 419          */
 420
 421         if (!dvbdev->entity)
 422                 return 0;
 423
 424         link = media_create_intf_link(dvbdev->entity, &dvbdev->intf_devnode->intf,
 425                                       MEDIA_LNK_FL_ENABLED);
 426         if (!link)
 427                 return -ENOMEM;
 428 #endif
 429         return 0;
 430 }
 431
 432 int dvb_register_device(struct dvb_adapter *adap, struct dvb_device **pdvbdev,
 433                         const struct dvb_device *template, void *priv, int type,
 434                         int demux_sink_pads)
 435 {
 436         struct dvb_device *dvbdev;
 437         struct file_operations *dvbdevfops;
 438         struct device *clsdev;
 439         int minor;
 440         int id, ret;
 441
 442         mutex_lock(&dvbdev_register_lock);
 443
 444         if ((id = dvbdev_get_free_id (adap, type)) < 0){
 445                 mutex_unlock(&dvbdev_register_lock);
 446                 *pdvbdev = NULL;
 447                 pr_err("%s: couldn't find free device id\n", __func__);
 448                 return -ENFILE;
 449         }
 450
 451         *pdvbdev = dvbdev = kzalloc(sizeof(*dvbdev), GFP_KERNEL);
 452
 453         if (!dvbdev){
 454                 mutex_unlock(&dvbdev_register_lock);
 455                 return -ENOMEM;
 456         }
 457
 458         dvbdevfops = kzalloc(sizeof(struct file_operations), GFP_KERNEL);
 459
 460         if (!dvbdevfops){
 461                 kfree (dvbdev);
 462                 mutex_unlock(&dvbdev_register_lock);
 463                 return -ENOMEM;
 464         }
 465
 466         memcpy(dvbdev, template, sizeof(struct dvb_device));
 467         dvbdev->type = type;
 468         dvbdev->id = id;
 469         dvbdev->adapter = adap;
 470         dvbdev->priv = priv;
 471         dvbdev->fops = dvbdevfops;
 472         init_waitqueue_head (&dvbdev->wait_queue);
 473
 474         memcpy(dvbdevfops, template->fops, sizeof(struct file_operations));
 475         dvbdevfops->owner = adap->module;
 476
 477         list_add_tail (&dvbdev->list_head, &adap->device_list);
 478
 479         down_write(&minor_rwsem);
 480 #ifdef CONFIG_DVB_DYNAMIC_MINORS
 481         for (minor = 0; minor < MAX_DVB_MINORS; minor++)
 482                 if (dvb_minors[minor] == NULL)
 483                         break;
 484
 485         if (minor == MAX_DVB_MINORS) {
 486                 kfree(dvbdevfops);
 487                 kfree(dvbdev);
 488                 up_write(&minor_rwsem);
 489                 mutex_unlock(&dvbdev_register_lock);
 490                 return -EINVAL;
 491         }
 492 #else
 493         minor = nums2minor(adap->num, type, id);
 494 #endif
 495
 496         dvbdev->minor = minor;
 497         dvb_minors[minor] = dvbdev;
 498         up_write(&minor_rwsem);
 499
 500         ret = dvb_register_media_device(dvbdev, type, minor, demux_sink_pads);
 501         if (ret) {
 502                 pr_err("%s: dvb_register_media_device failed to create the mediagraph\n",
 503                       __func__);
 504
 505                 dvb_media_device_free(dvbdev);
 506                 kfree(dvbdevfops);
 507                 kfree(dvbdev);
 508                 up_write(&minor_rwsem);
 509                 mutex_unlock(&dvbdev_register_lock);
 510                 return ret;
 511         }
 512
 513         mutex_unlock(&dvbdev_register_lock);
 514
 515         clsdev = device_create(dvb_class, adap->device,
 516                                MKDEV(DVB_MAJOR, minor),
 517                                dvbdev, "dvb%d.%s%d", adap->num, dnames[type], id);
 518         if (IS_ERR(clsdev)) {
 519                 pr_err("%s: failed to create device dvb%d.%s%d (%ld)\n",
 520                        __func__, adap->num, dnames[type], id, PTR_ERR(clsdev));
 521                 return PTR_ERR(clsdev);
 522         }
 523         dprintk("DVB: register adapter%d/%s%d @ minor: %i (0x%02x)\n",
 524                 adap->num, dnames[type], id, minor, minor);
 525
 526         return 0;
 527 }
 528 EXPORT_SYMBOL(dvb_register_device);
 529
 530
 531 void dvb_unregister_device(struct dvb_device *dvbdev)
 532 {
 533         if (!dvbdev)
 534                 return;
 535
 536         down_write(&minor_rwsem);
 537         dvb_minors[dvbdev->minor] = NULL;
 538         up_write(&minor_rwsem);
 539
 540         dvb_media_device_free(dvbdev);
 541
 542         device_destroy(dvb_class, MKDEV(DVB_MAJOR, dvbdev->minor));
 543
 544         list_del (&dvbdev->list_head);
 545         kfree (dvbdev->fops);
 546         kfree (dvbdev);
 547 }
 548 EXPORT_SYMBOL(dvb_unregister_device);
 549
 550
 551 #ifdef CONFIG_MEDIA_CONTROLLER_DVB
 552
 553 static int dvb_create_io_intf_links(struct dvb_adapter *adap,
 554                                     struct media_interface *intf,
 555                                     char *name)
 556 {
 557         struct media_device *mdev = adap->mdev;
 558         struct media_entity *entity;
 559         struct media_link *link;
 560
 561         media_device_for_each_entity(entity, mdev) {
 562                 if (entity->function == MEDIA_ENT_F_IO_DTV) {
 563                         if (strncmp(entity->name, name, strlen(name)))
 564                                 continue;
 565                         link = media_create_intf_link(entity, intf,
 566                                                       MEDIA_LNK_FL_ENABLED);
 567                         if (!link)
 568                                 return -ENOMEM;
 569                 }
 570         }
 571         return 0;
 572 }
 573
 574 int dvb_create_media_graph(struct dvb_adapter *adap,
 575                            bool create_rf_connector)
 576 {
 577         struct media_device *mdev = adap->mdev;
 578         struct media_entity *entity, *tuner = NULL, *demod = NULL, *conn;
 579         struct media_entity *demux = NULL, *ca = NULL;
 580         struct media_link *link;
 581         struct media_interface *intf;
 582         unsigned demux_pad = 0;
 583         unsigned dvr_pad = 0;
 584         unsigned ntuner = 0, ndemod = 0;
 585         int ret;
 586         static const char *connector_name = "Television";
 587
 588         if (!mdev)
 589                 return 0;
 590
 591         media_device_for_each_entity(entity, mdev) {
 592                 switch (entity->function) {
 593                 case MEDIA_ENT_F_TUNER:
 594                         tuner = entity;
 595                         ntuner++;
 596                         break;
 597                 case MEDIA_ENT_F_DTV_DEMOD:
 598                         demod = entity;
 599                         ndemod++;
 600                         break;
 601                 case MEDIA_ENT_F_TS_DEMUX:
 602                         demux = entity;
 603                         break;
 604                 case MEDIA_ENT_F_DTV_CA:
 605                         ca = entity;
 606                         break;
 607                 }
 608         }
 609
 610         /*
 611          * Prepare to signalize to media_create_pad_links() that multiple
 612          * entities of the same type exists and a 1:n or n:1 links need to be
 613          * created.
 614          * NOTE: if both tuner and demod have multiple instances, it is up
 615          * to the caller driver to create such links.
 616          */
 617         if (ntuner > 1)
 618                 tuner = NULL;
 619         if (ndemod > 1)
 620                 demod = NULL;
 621
 622         if (create_rf_connector) {
 623                 conn = kzalloc(sizeof(*conn), GFP_KERNEL);
 624                 if (!conn)
 625                         return -ENOMEM;
 626                 adap->conn = conn;
 627
 628                 adap->conn_pads = kzalloc(sizeof(*adap->conn_pads), GFP_KERNEL);
 629                 if (!adap->conn_pads)
 630                         return -ENOMEM;
 631
 632                 conn->flags = MEDIA_ENT_FL_CONNECTOR;
 633                 conn->function = MEDIA_ENT_F_CONN_RF;
 634                 conn->name = connector_name;
 635                 adap->conn_pads->flags = MEDIA_PAD_FL_SOURCE;
 636
 637                 ret = media_entity_pads_init(conn, 1, adap->conn_pads);
 638                 if (ret)
 639                         return ret;
 640
 641                 ret = media_device_register_entity(mdev, conn);
 642                 if (ret)
 643                         return ret;
 644
 645                 if (!ntuner)
 646                         ret = media_create_pad_links(mdev,
 647                                                      MEDIA_ENT_F_CONN_RF,
 648                                                      conn, 0,
 649                                                      MEDIA_ENT_F_DTV_DEMOD,
 650                                                      demod, 0,
 651                                                      MEDIA_LNK_FL_ENABLED,
 652                                                      false);
 653                 else
 654                         ret = media_create_pad_links(mdev,
 655                                                      MEDIA_ENT_F_CONN_RF,
 656                                                      conn, 0,
 657                                                      MEDIA_ENT_F_TUNER,
 658                                                      tuner, TUNER_PAD_RF_INPUT,
 659                                                      MEDIA_LNK_FL_ENABLED,
 660                                                      false);
 661                 if (ret)
 662                         return ret;
 663         }
 664
 665         if (ntuner && ndemod) {
 666                 ret = media_create_pad_links(mdev,
 667                                              MEDIA_ENT_F_TUNER,
 668                                              tuner, TUNER_PAD_OUTPUT,
 669                                              MEDIA_ENT_F_DTV_DEMOD,
 670                                              demod, 0, MEDIA_LNK_FL_ENABLED,
 671                                              false);
 672                 if (ret)
 673                         return ret;
 674         }
 675
 676         if (ndemod && demux) {
 677                 ret = media_create_pad_links(mdev,
 678                                              MEDIA_ENT_F_DTV_DEMOD,
 679                                              demod, 1,
 680                                              MEDIA_ENT_F_TS_DEMUX,
 681                                              demux, 0, MEDIA_LNK_FL_ENABLED,
 682                                              false);
 683                 if (ret)
 684                         return ret;
 685         }
 686         if (demux && ca) {
 687                 ret = media_create_pad_link(demux, 1, ca,
 688                                             0, MEDIA_LNK_FL_ENABLED);
 689                 if (ret)
 690                         return ret;
 691         }
 692
 693         /* Create demux links for each ringbuffer/pad */
 694         if (demux) {
 695                 media_device_for_each_entity(entity, mdev) {
 696                         if (entity->function == MEDIA_ENT_F_IO_DTV) {
 697                                 if (!strncmp(entity->name, DVR_TSOUT,
 698                                     strlen(DVR_TSOUT))) {
 699                                         ret = media_create_pad_link(demux,
 700                                                                 ++dvr_pad,
 701                                                             entity, 0, 0);
 702                                         if (ret)
 703                                                 return ret;
 704                                 }
 705                                 if (!strncmp(entity->name, DEMUX_TSOUT,
 706                                     strlen(DEMUX_TSOUT))) {
 707                                         ret = media_create_pad_link(demux,
 708                                                               ++demux_pad,
 709                                                             entity, 0, 0);
 710                                         if (ret)
 711                                                 return ret;
 712                                 }
 713                         }
 714                 }
 715         }
 716
 717         /* Create interface links for FE->tuner, DVR->demux and CA->ca */
 718         media_device_for_each_intf(intf, mdev) {
 719                 if (intf->type == MEDIA_INTF_T_DVB_CA && ca) {
 720                         link = media_create_intf_link(ca, intf,
 721                                                       MEDIA_LNK_FL_ENABLED);
 722                         if (!link)
 723                                 return -ENOMEM;
 724                 }
 725
 726                 if (intf->type == MEDIA_INTF_T_DVB_FE && tuner) {
 727                         link = media_create_intf_link(tuner, intf,
 728                                                       MEDIA_LNK_FL_ENABLED);
 729                         if (!link)
 730                                 return -ENOMEM;
 731                 }
 732 #if 0
 733                 /*
 734                  * Indirect link - let's not create yet, as we don't know how
 735                  *                 to handle indirect links, nor if this will
 736                  *                 actually be needed.
 737                  */
 738                 if (intf->type == MEDIA_INTF_T_DVB_DVR && demux) {
 739                         link = media_create_intf_link(demux, intf,
 740                                                       MEDIA_LNK_FL_ENABLED);
 741                         if (!link)
 742                                 return -ENOMEM;
 743                 }
 744 #endif
 745                 if (intf->type == MEDIA_INTF_T_DVB_DVR) {
 746                         ret = dvb_create_io_intf_links(adap, intf, DVR_TSOUT);
 747                         if (ret)
 748                                 return ret;
 749                 }
 750                 if (intf->type == MEDIA_INTF_T_DVB_DEMUX) {
 751                         ret = dvb_create_io_intf_links(adap, intf, DEMUX_TSOUT);
 752                         if (ret)
 753                                 return ret;
 754                 }
 755         }
 756         return 0;
 757 }
 758 EXPORT_SYMBOL_GPL(dvb_create_media_graph);
 759 #endif
 760
 761 static int dvbdev_check_free_adapter_num(int num)
 762 {
 763         struct list_head *entry;
 764         list_for_each(entry, &dvb_adapter_list) {
 765                 struct dvb_adapter *adap;
 766                 adap = list_entry(entry, struct dvb_adapter, list_head);
 767                 if (adap->num == num)
 768                         return 0;
 769         }
 770         return 1;
 771 }
 772
 773 static int dvbdev_get_free_adapter_num (void)
 774 {
 775         int num = 0;
 776
 777         while (num < DVB_MAX_ADAPTERS) {
 778                 if (dvbdev_check_free_adapter_num(num))
 779                         return num;
 780                 num++;
 781         }
 782
 783         return -ENFILE;
 784 }
 785
 786
 787 int dvb_register_adapter(struct dvb_adapter *adap, const char *name,
 788                          struct module *module, struct device *device,
 789                          short *adapter_nums)
 790 {
 791         int i, num;
 792
 793         mutex_lock(&dvbdev_register_lock);
 794
 795         for (i = 0; i < DVB_MAX_ADAPTERS; ++i) {
 796                 num = adapter_nums[i];
 797                 if (num >= 0  &&  num < DVB_MAX_ADAPTERS) {
 798                 /* use the one the driver asked for */
 799                         if (dvbdev_check_free_adapter_num(num))
 800                                 break;
 801                 } else {
 802                         num = dvbdev_get_free_adapter_num();
 803                         break;
 804                 }
 805                 num = -1;
 806         }
 807
 808         if (num < 0) {
 809                 mutex_unlock(&dvbdev_register_lock);
 810                 return -ENFILE;
 811         }
 812
 813         memset (adap, 0, sizeof(struct dvb_adapter));
 814         INIT_LIST_HEAD (&adap->device_list);
 815
 816         pr_info("DVB: registering new adapter (%s)\n", name);
 817
 818         adap->num = num;
 819         adap->name = name;
 820         adap->module = module;
 821         adap->device = device;
 822         adap->mfe_shared = 0;
 823         adap->mfe_dvbdev = NULL;
 824         mutex_init (&adap->mfe_lock);
 825
 826         list_add_tail (&adap->list_head, &dvb_adapter_list);
 827
 828         mutex_unlock(&dvbdev_register_lock);
 829
 830         return num;
 831 }
 832 EXPORT_SYMBOL(dvb_register_adapter);
 833
 834
 835 int dvb_unregister_adapter(struct dvb_adapter *adap)
 836 {
 837         mutex_lock(&dvbdev_register_lock);
 838         list_del (&adap->list_head);
 839         mutex_unlock(&dvbdev_register_lock);
 840         return 0;
 841 }
 842 EXPORT_SYMBOL(dvb_unregister_adapter);
 843
 844 /* if the miracle happens and "generic_usercopy()" is included into
 845    the kernel, then this can vanish. please don't make the mistake and
 846    define this as video_usercopy(). this will introduce a dependecy
 847    to the v4l "videodev.o" module, which is unnecessary for some
 848    cards (ie. the budget dvb-cards don't need the v4l module...) */
 849 int dvb_usercopy(struct file *file,
 850                      unsigned int cmd, unsigned long arg,
 851                      int (*func)(struct file *file,
 852                      unsigned int cmd, void *arg))
 853 {
 854         char    sbuf[128];
 855         void    *mbuf = NULL;
 856         void    *parg = NULL;
 857         int     err  = -EINVAL;
 858
 859         /*  Copy arguments into temp kernel buffer  */
 860         switch (_IOC_DIR(cmd)) {
 861         case _IOC_NONE:
 862                 /*
 863                  * For this command, the pointer is actually an integer
 864                  * argument.
 865                  */
 866                 parg = (void *) arg;
 867                 break;
 868         case _IOC_READ: /* some v4l ioctls are marked wrong ... */
 869         case _IOC_WRITE:
 870         case (_IOC_WRITE | _IOC_READ):
 871                 if (_IOC_SIZE(cmd) <= sizeof(sbuf)) {
 872                         parg = sbuf;
 873                 } else {
 874                         /* too big to allocate from stack */
 875                         mbuf = kmalloc(_IOC_SIZE(cmd), GFP_KERNEL);
 876                         if (NULL == mbuf)
 877                                 return -ENOMEM;
 878                         parg = mbuf;
 879                 }
 880
 881                 err = -EFAULT;
 882                 if (copy_from_user(parg, (void __user *)arg, _IOC_SIZE(cmd)))
 883                         goto out;
 884                 break;
 885         }
 886
 887         /* call driver */
 888         if ((err = func(file, cmd, parg)) == -ENOIOCTLCMD)
 889                 err = -ENOTTY;
 890
 891         if (err < 0)
 892                 goto out;
 893
 894         /*  Copy results into user buffer  */
 895         switch (_IOC_DIR(cmd))
 896         {
 897         case _IOC_READ:
 898         case (_IOC_WRITE | _IOC_READ):
 899                 if (copy_to_user((void __user *)arg, parg, _IOC_SIZE(cmd)))
 900                         err = -EFAULT;
 901                 break;
 902         }
 903
 904 out:
 905         kfree(mbuf);
 906         return err;
 907 }
 908
 909 static int dvb_uevent(struct device *dev, struct kobj_uevent_env *env)
 910 {
 911         struct dvb_device *dvbdev = dev_get_drvdata(dev);
 912
 913         add_uevent_var(env, "DVB_ADAPTER_NUM=%d", dvbdev->adapter->num);
 914         add_uevent_var(env, "DVB_DEVICE_TYPE=%s", dnames[dvbdev->type]);
 915         add_uevent_var(env, "DVB_DEVICE_NUM=%d", dvbdev->id);
 916         return 0;
 917 }
 918
 919 static char *dvb_devnode(struct device *dev, umode_t *mode)
 920 {
 921         struct dvb_device *dvbdev = dev_get_drvdata(dev);
 922
 923         return kasprintf(GFP_KERNEL, "dvb/adapter%d/%s%d",
 924                 dvbdev->adapter->num, dnames[dvbdev->type], dvbdev->id);
 925 }
 926
 927
 928 static int __init init_dvbdev(void)
 929 {
 930         int retval;
 931         dev_t dev = MKDEV(DVB_MAJOR, 0);
 932
 933         if ((retval = register_chrdev_region(dev, MAX_DVB_MINORS, "DVB")) != 0) {
 934                 pr_err("dvb-core: unable to get major %d\n", DVB_MAJOR);
 935                 return retval;
 936         }
 937
 938         cdev_init(&dvb_device_cdev, &dvb_device_fops);
 939         if ((retval = cdev_add(&dvb_device_cdev, dev, MAX_DVB_MINORS)) != 0) {
 940                 pr_err("dvb-core: unable register character device\n");
 941                 goto error;
 942         }
 943
 944         dvb_class = class_create(THIS_MODULE, "dvb");
 945         if (IS_ERR(dvb_class)) {
 946                 retval = PTR_ERR(dvb_class);
 947                 goto error;
 948         }
 949         dvb_class->dev_uevent = dvb_uevent;
 950         dvb_class->devnode = dvb_devnode;
 951         return 0;
 952
 953 error:
 954         cdev_del(&dvb_device_cdev);
 955         unregister_chrdev_region(dev, MAX_DVB_MINORS);
 956         return retval;
 957 }
 958
 959
 960 static void __exit exit_dvbdev(void)
 961 {
 962         class_destroy(dvb_class);
 963         cdev_del(&dvb_device_cdev);
 964         unregister_chrdev_region(MKDEV(DVB_MAJOR, 0), MAX_DVB_MINORS);
 965 }
 966
 967 subsys_initcall(init_dvbdev);
 968 module_exit(exit_dvbdev);
 969
 970 MODULE_DESCRIPTION("DVB Core Driver");
 971 MODULE_AUTHOR("Marcus Metzler, Ralph Metzler, Holger Waechtler");
 972 MODULE_LICENSE("GPL");