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_remove_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 }
 546 EXPORT_SYMBOL(dvb_remove_device);
 547
 548
 549 void dvb_free_device(struct dvb_device *dvbdev)
 550 {
 551         if (!dvbdev)
 552                 return;
 553
 554         kfree (dvbdev->fops);
 555         kfree (dvbdev);
 556 }
 557 EXPORT_SYMBOL(dvb_free_device);
 558
 559
 560 void dvb_unregister_device(struct dvb_device *dvbdev)
 561 {
 562         dvb_remove_device(dvbdev);
 563         dvb_free_device(dvbdev);
 564 }
 565 EXPORT_SYMBOL(dvb_unregister_device);
 566
 567
 568 #ifdef CONFIG_MEDIA_CONTROLLER_DVB
 569
 570 static int dvb_create_io_intf_links(struct dvb_adapter *adap,
 571                                     struct media_interface *intf,
 572                                     char *name)
 573 {
 574         struct media_device *mdev = adap->mdev;
 575         struct media_entity *entity;
 576         struct media_link *link;
 577
 578         media_device_for_each_entity(entity, mdev) {
 579                 if (entity->function == MEDIA_ENT_F_IO_DTV) {
 580                         if (strncmp(entity->name, name, strlen(name)))
 581                                 continue;
 582                         link = media_create_intf_link(entity, intf,
 583                                                       MEDIA_LNK_FL_ENABLED);
 584                         if (!link)
 585                                 return -ENOMEM;
 586                 }
 587         }
 588         return 0;
 589 }
 590
 591 int dvb_create_media_graph(struct dvb_adapter *adap,
 592                            bool create_rf_connector)
 593 {
 594         struct media_device *mdev = adap->mdev;
 595         struct media_entity *entity, *tuner = NULL, *demod = NULL, *conn;
 596         struct media_entity *demux = NULL, *ca = NULL;
 597         struct media_link *link;
 598         struct media_interface *intf;
 599         unsigned demux_pad = 0;
 600         unsigned dvr_pad = 0;
 601         unsigned ntuner = 0, ndemod = 0;
 602         int ret;
 603         static const char *connector_name = "Television";
 604
 605         if (!mdev)
 606                 return 0;
 607
 608         media_device_for_each_entity(entity, mdev) {
 609                 switch (entity->function) {
 610                 case MEDIA_ENT_F_TUNER:
 611                         tuner = entity;
 612                         ntuner++;
 613                         break;
 614                 case MEDIA_ENT_F_DTV_DEMOD:
 615                         demod = entity;
 616                         ndemod++;
 617                         break;
 618                 case MEDIA_ENT_F_TS_DEMUX:
 619                         demux = entity;
 620                         break;
 621                 case MEDIA_ENT_F_DTV_CA:
 622                         ca = entity;
 623                         break;
 624                 }
 625         }
 626
 627         /*
 628          * Prepare to signalize to media_create_pad_links() that multiple
 629          * entities of the same type exists and a 1:n or n:1 links need to be
 630          * created.
 631          * NOTE: if both tuner and demod have multiple instances, it is up
 632          * to the caller driver to create such links.
 633          */
 634         if (ntuner > 1)
 635                 tuner = NULL;
 636         if (ndemod > 1)
 637                 demod = NULL;
 638
 639         if (create_rf_connector) {
 640                 conn = kzalloc(sizeof(*conn), GFP_KERNEL);
 641                 if (!conn)
 642                         return -ENOMEM;
 643                 adap->conn = conn;
 644
 645                 adap->conn_pads = kzalloc(sizeof(*adap->conn_pads), GFP_KERNEL);
 646                 if (!adap->conn_pads)
 647                         return -ENOMEM;
 648
 649                 conn->flags = MEDIA_ENT_FL_CONNECTOR;
 650                 conn->function = MEDIA_ENT_F_CONN_RF;
 651                 conn->name = connector_name;
 652                 adap->conn_pads->flags = MEDIA_PAD_FL_SOURCE;
 653
 654                 ret = media_entity_pads_init(conn, 1, adap->conn_pads);
 655                 if (ret)
 656                         return ret;
 657
 658                 ret = media_device_register_entity(mdev, conn);
 659                 if (ret)
 660                         return ret;
 661
 662                 if (!ntuner)
 663                         ret = media_create_pad_links(mdev,
 664                                                      MEDIA_ENT_F_CONN_RF,
 665                                                      conn, 0,
 666                                                      MEDIA_ENT_F_DTV_DEMOD,
 667                                                      demod, 0,
 668                                                      MEDIA_LNK_FL_ENABLED,
 669                                                      false);
 670                 else
 671                         ret = media_create_pad_links(mdev,
 672                                                      MEDIA_ENT_F_CONN_RF,
 673                                                      conn, 0,
 674                                                      MEDIA_ENT_F_TUNER,
 675                                                      tuner, TUNER_PAD_RF_INPUT,
 676                                                      MEDIA_LNK_FL_ENABLED,
 677                                                      false);
 678                 if (ret)
 679                         return ret;
 680         }
 681
 682         if (ntuner && ndemod) {
 683                 ret = media_create_pad_links(mdev,
 684                                              MEDIA_ENT_F_TUNER,
 685                                              tuner, TUNER_PAD_OUTPUT,
 686                                              MEDIA_ENT_F_DTV_DEMOD,
 687                                              demod, 0, MEDIA_LNK_FL_ENABLED,
 688                                              false);
 689                 if (ret)
 690                         return ret;
 691         }
 692
 693         if (ndemod && demux) {
 694                 ret = media_create_pad_links(mdev,
 695                                              MEDIA_ENT_F_DTV_DEMOD,
 696                                              demod, 1,
 697                                              MEDIA_ENT_F_TS_DEMUX,
 698                                              demux, 0, MEDIA_LNK_FL_ENABLED,
 699                                              false);
 700                 if (ret)
 701                         return ret;
 702         }
 703         if (demux && ca) {
 704                 ret = media_create_pad_link(demux, 1, ca,
 705                                             0, MEDIA_LNK_FL_ENABLED);
 706                 if (ret)
 707                         return ret;
 708         }
 709
 710         /* Create demux links for each ringbuffer/pad */
 711         if (demux) {
 712                 media_device_for_each_entity(entity, mdev) {
 713                         if (entity->function == MEDIA_ENT_F_IO_DTV) {
 714                                 if (!strncmp(entity->name, DVR_TSOUT,
 715                                     strlen(DVR_TSOUT))) {
 716                                         ret = media_create_pad_link(demux,
 717                                                                 ++dvr_pad,
 718                                                             entity, 0, 0);
 719                                         if (ret)
 720                                                 return ret;
 721                                 }
 722                                 if (!strncmp(entity->name, DEMUX_TSOUT,
 723                                     strlen(DEMUX_TSOUT))) {
 724                                         ret = media_create_pad_link(demux,
 725                                                               ++demux_pad,
 726                                                             entity, 0, 0);
 727                                         if (ret)
 728                                                 return ret;
 729                                 }
 730                         }
 731                 }
 732         }
 733
 734         /* Create interface links for FE->tuner, DVR->demux and CA->ca */
 735         media_device_for_each_intf(intf, mdev) {
 736                 if (intf->type == MEDIA_INTF_T_DVB_CA && ca) {
 737                         link = media_create_intf_link(ca, intf,
 738                                                       MEDIA_LNK_FL_ENABLED);
 739                         if (!link)
 740                                 return -ENOMEM;
 741                 }
 742
 743                 if (intf->type == MEDIA_INTF_T_DVB_FE && tuner) {
 744                         link = media_create_intf_link(tuner, intf,
 745                                                       MEDIA_LNK_FL_ENABLED);
 746                         if (!link)
 747                                 return -ENOMEM;
 748                 }
 749 #if 0
 750                 /*
 751                  * Indirect link - let's not create yet, as we don't know how
 752                  *                 to handle indirect links, nor if this will
 753                  *                 actually be needed.
 754                  */
 755                 if (intf->type == MEDIA_INTF_T_DVB_DVR && demux) {
 756                         link = media_create_intf_link(demux, intf,
 757                                                       MEDIA_LNK_FL_ENABLED);
 758                         if (!link)
 759                                 return -ENOMEM;
 760                 }
 761 #endif
 762                 if (intf->type == MEDIA_INTF_T_DVB_DVR) {
 763                         ret = dvb_create_io_intf_links(adap, intf, DVR_TSOUT);
 764                         if (ret)
 765                                 return ret;
 766                 }
 767                 if (intf->type == MEDIA_INTF_T_DVB_DEMUX) {
 768                         ret = dvb_create_io_intf_links(adap, intf, DEMUX_TSOUT);
 769                         if (ret)
 770                                 return ret;
 771                 }
 772         }
 773         return 0;
 774 }
 775 EXPORT_SYMBOL_GPL(dvb_create_media_graph);
 776 #endif
 777
 778 static int dvbdev_check_free_adapter_num(int num)
 779 {
 780         struct list_head *entry;
 781         list_for_each(entry, &dvb_adapter_list) {
 782                 struct dvb_adapter *adap;
 783                 adap = list_entry(entry, struct dvb_adapter, list_head);
 784                 if (adap->num == num)
 785                         return 0;
 786         }
 787         return 1;
 788 }
 789
 790 static int dvbdev_get_free_adapter_num (void)
 791 {
 792         int num = 0;
 793
 794         while (num < DVB_MAX_ADAPTERS) {
 795                 if (dvbdev_check_free_adapter_num(num))
 796                         return num;
 797                 num++;
 798         }
 799
 800         return -ENFILE;
 801 }
 802
 803
 804 int dvb_register_adapter(struct dvb_adapter *adap, const char *name,
 805                          struct module *module, struct device *device,
 806                          short *adapter_nums)
 807 {
 808         int i, num;
 809
 810         mutex_lock(&dvbdev_register_lock);
 811
 812         for (i = 0; i < DVB_MAX_ADAPTERS; ++i) {
 813                 num = adapter_nums[i];
 814                 if (num >= 0  &&  num < DVB_MAX_ADAPTERS) {
 815                 /* use the one the driver asked for */
 816                         if (dvbdev_check_free_adapter_num(num))
 817                                 break;
 818                 } else {
 819                         num = dvbdev_get_free_adapter_num();
 820                         break;
 821                 }
 822                 num = -1;
 823         }
 824
 825         if (num < 0) {
 826                 mutex_unlock(&dvbdev_register_lock);
 827                 return -ENFILE;
 828         }
 829
 830         memset (adap, 0, sizeof(struct dvb_adapter));
 831         INIT_LIST_HEAD (&adap->device_list);
 832
 833         pr_info("DVB: registering new adapter (%s)\n", name);
 834
 835         adap->num = num;
 836         adap->name = name;
 837         adap->module = module;
 838         adap->device = device;
 839         adap->mfe_shared = 0;
 840         adap->mfe_dvbdev = NULL;
 841         mutex_init (&adap->mfe_lock);
 842
 843         list_add_tail (&adap->list_head, &dvb_adapter_list);
 844
 845         mutex_unlock(&dvbdev_register_lock);
 846
 847         return num;
 848 }
 849 EXPORT_SYMBOL(dvb_register_adapter);
 850
 851
 852 int dvb_unregister_adapter(struct dvb_adapter *adap)
 853 {
 854         mutex_lock(&dvbdev_register_lock);
 855         list_del (&adap->list_head);
 856         mutex_unlock(&dvbdev_register_lock);
 857         return 0;
 858 }
 859 EXPORT_SYMBOL(dvb_unregister_adapter);
 860
 861 /* if the miracle happens and "generic_usercopy()" is included into
 862    the kernel, then this can vanish. please don't make the mistake and
 863    define this as video_usercopy(). this will introduce a dependecy
 864    to the v4l "videodev.o" module, which is unnecessary for some
 865    cards (ie. the budget dvb-cards don't need the v4l module...) */
 866 int dvb_usercopy(struct file *file,
 867                      unsigned int cmd, unsigned long arg,
 868                      int (*func)(struct file *file,
 869                      unsigned int cmd, void *arg))
 870 {
 871         char    sbuf[128];
 872         void    *mbuf = NULL;
 873         void    *parg = NULL;
 874         int     err  = -EINVAL;
 875
 876         /*  Copy arguments into temp kernel buffer  */
 877         switch (_IOC_DIR(cmd)) {
 878         case _IOC_NONE:
 879                 /*
 880                  * For this command, the pointer is actually an integer
 881                  * argument.
 882                  */
 883                 parg = (void *) arg;
 884                 break;
 885         case _IOC_READ: /* some v4l ioctls are marked wrong ... */
 886         case _IOC_WRITE:
 887         case (_IOC_WRITE | _IOC_READ):
 888                 if (_IOC_SIZE(cmd) <= sizeof(sbuf)) {
 889                         parg = sbuf;
 890                 } else {
 891                         /* too big to allocate from stack */
 892                         mbuf = kmalloc(_IOC_SIZE(cmd), GFP_KERNEL);
 893                         if (NULL == mbuf)
 894                                 return -ENOMEM;
 895                         parg = mbuf;
 896                 }
 897
 898                 err = -EFAULT;
 899                 if (copy_from_user(parg, (void __user *)arg, _IOC_SIZE(cmd)))
 900                         goto out;
 901                 break;
 902         }
 903
 904         /* call driver */
 905         if ((err = func(file, cmd, parg)) == -ENOIOCTLCMD)
 906                 err = -ENOTTY;
 907
 908         if (err < 0)
 909                 goto out;
 910
 911         /*  Copy results into user buffer  */
 912         switch (_IOC_DIR(cmd))
 913         {
 914         case _IOC_READ:
 915         case (_IOC_WRITE | _IOC_READ):
 916                 if (copy_to_user((void __user *)arg, parg, _IOC_SIZE(cmd)))
 917                         err = -EFAULT;
 918                 break;
 919         }
 920
 921 out:
 922         kfree(mbuf);
 923         return err;
 924 }
 925
 926 static int dvb_uevent(struct device *dev, struct kobj_uevent_env *env)
 927 {
 928         struct dvb_device *dvbdev = dev_get_drvdata(dev);
 929
 930         add_uevent_var(env, "DVB_ADAPTER_NUM=%d", dvbdev->adapter->num);
 931         add_uevent_var(env, "DVB_DEVICE_TYPE=%s", dnames[dvbdev->type]);
 932         add_uevent_var(env, "DVB_DEVICE_NUM=%d", dvbdev->id);
 933         return 0;
 934 }
 935
 936 static char *dvb_devnode(struct device *dev, umode_t *mode)
 937 {
 938         struct dvb_device *dvbdev = dev_get_drvdata(dev);
 939
 940         return kasprintf(GFP_KERNEL, "dvb/adapter%d/%s%d",
 941                 dvbdev->adapter->num, dnames[dvbdev->type], dvbdev->id);
 942 }
 943
 944
 945 static int __init init_dvbdev(void)
 946 {
 947         int retval;
 948         dev_t dev = MKDEV(DVB_MAJOR, 0);
 949
 950         if ((retval = register_chrdev_region(dev, MAX_DVB_MINORS, "DVB")) != 0) {
 951                 pr_err("dvb-core: unable to get major %d\n", DVB_MAJOR);
 952                 return retval;
 953         }
 954
 955         cdev_init(&dvb_device_cdev, &dvb_device_fops);
 956         if ((retval = cdev_add(&dvb_device_cdev, dev, MAX_DVB_MINORS)) != 0) {
 957                 pr_err("dvb-core: unable register character device\n");
 958                 goto error;
 959         }
 960
 961         dvb_class = class_create(THIS_MODULE, "dvb");
 962         if (IS_ERR(dvb_class)) {
 963                 retval = PTR_ERR(dvb_class);
 964                 goto error;
 965         }
 966         dvb_class->dev_uevent = dvb_uevent;
 967         dvb_class->devnode = dvb_devnode;
 968         return 0;
 969
 970 error:
 971         cdev_del(&dvb_device_cdev);
 972         unregister_chrdev_region(dev, MAX_DVB_MINORS);
 973         return retval;
 974 }
 975
 976
 977 static void __exit exit_dvbdev(void)
 978 {
 979         class_destroy(dvb_class);
 980         cdev_del(&dvb_device_cdev);
 981         unregister_chrdev_region(MKDEV(DVB_MAJOR, 0), MAX_DVB_MINORS);
 982 }
 983
 984 subsys_initcall(init_dvbdev);
 985 module_exit(exit_dvbdev);
 986
 987 MODULE_DESCRIPTION("DVB Core Driver");
 988 MODULE_AUTHOR("Marcus Metzler, Ralph Metzler, Holger Waechtler");
 989 MODULE_LICENSE("GPL");