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/init.h>
  28 #include <linux/slab.h>
  29 #include <linux/device.h>
  30 #include <linux/fs.h>
  31 #include <linux/cdev.h>
  32 #include <linux/mutex.h>
  33 #include "dvbdev.h"
  34
  35 /* Due to enum tuner_pad_index */
  36 #include <media/tuner.h>
  37
  38 static DEFINE_MUTEX(dvbdev_mutex);
  39 static int dvbdev_debug;
  40
  41 module_param(dvbdev_debug, int, 0644);
  42 MODULE_PARM_DESC(dvbdev_debug, "Turn on/off device debugging (default:off).");
  43
  44 #define dprintk(fmt, arg...) do {                                       \
  45         if (dvbdev_debug)                                               \
  46                 printk(KERN_DEBUG pr_fmt("%s: " fmt),                   \
  47                        __func__, ##arg);                                \
  48 } while (0)
  49
  50 static LIST_HEAD(dvb_adapter_list);
  51 static DEFINE_MUTEX(dvbdev_register_lock);
  52
  53 static const char * const dnames[] = {
  54         "video", "audio", "sec", "frontend", "demux", "dvr", "ca",
  55         "net", "osd"
  56 };
  57
  58 #ifdef CONFIG_DVB_DYNAMIC_MINORS
  59 #define MAX_DVB_MINORS          256
  60 #define DVB_MAX_IDS             MAX_DVB_MINORS
  61 #else
  62 #define DVB_MAX_IDS             4
  63 #define nums2minor(num, type, id)       ((num << 6) | (id << 4) | type)
  64 #define MAX_DVB_MINORS          (DVB_MAX_ADAPTERS*64)
  65 #endif
  66
  67 static struct class *dvb_class;
  68
  69 static struct dvb_device *dvb_minors[MAX_DVB_MINORS];
  70 static DECLARE_RWSEM(minor_rwsem);
  71
  72 static int dvb_device_open(struct inode *inode, struct file *file)
  73 {
  74         struct dvb_device *dvbdev;
  75
  76         mutex_lock(&dvbdev_mutex);
  77         down_read(&minor_rwsem);
  78         dvbdev = dvb_minors[iminor(inode)];
  79
  80         if (dvbdev && dvbdev->fops) {
  81                 int err = 0;
  82                 const struct file_operations *new_fops;
  83
  84                 new_fops = fops_get(dvbdev->fops);
  85                 if (!new_fops)
  86                         goto fail;
  87                 file->private_data = dvbdev;
  88                 replace_fops(file, new_fops);
  89                 if (file->f_op->open)
  90                         err = file->f_op->open(inode, file);
  91                 up_read(&minor_rwsem);
  92                 mutex_unlock(&dvbdev_mutex);
  93                 return err;
  94         }
  95 fail:
  96         up_read(&minor_rwsem);
  97         mutex_unlock(&dvbdev_mutex);
  98         return -ENODEV;
  99 }
 100
 101
 102 static const struct file_operations dvb_device_fops =
 103 {
 104         .owner =        THIS_MODULE,
 105         .open =         dvb_device_open,
 106         .llseek =       noop_llseek,
 107 };
 108
 109 static struct cdev dvb_device_cdev;
 110
 111 int dvb_generic_open(struct inode *inode, struct file *file)
 112 {
 113         struct dvb_device *dvbdev = file->private_data;
 114
 115         if (!dvbdev)
 116                 return -ENODEV;
 117
 118         if (!dvbdev->users)
 119                 return -EBUSY;
 120
 121         if ((file->f_flags & O_ACCMODE) == O_RDONLY) {
 122                 if (!dvbdev->readers)
 123                         return -EBUSY;
 124                 dvbdev->readers--;
 125         } else {
 126                 if (!dvbdev->writers)
 127                         return -EBUSY;
 128                 dvbdev->writers--;
 129         }
 130
 131         dvbdev->users--;
 132         return 0;
 133 }
 134 EXPORT_SYMBOL(dvb_generic_open);
 135
 136
 137 int dvb_generic_release(struct inode *inode, struct file *file)
 138 {
 139         struct dvb_device *dvbdev = file->private_data;
 140
 141         if (!dvbdev)
 142                 return -ENODEV;
 143
 144         if ((file->f_flags & O_ACCMODE) == O_RDONLY) {
 145                 dvbdev->readers++;
 146         } else {
 147                 dvbdev->writers++;
 148         }
 149
 150         dvbdev->users++;
 151         return 0;
 152 }
 153 EXPORT_SYMBOL(dvb_generic_release);
 154
 155
 156 long dvb_generic_ioctl(struct file *file,
 157                        unsigned int cmd, unsigned long arg)
 158 {
 159         struct dvb_device *dvbdev = file->private_data;
 160
 161         if (!dvbdev)
 162                 return -ENODEV;
 163
 164         if (!dvbdev->kernel_ioctl)
 165                 return -EINVAL;
 166
 167         return dvb_usercopy(file, cmd, arg, dvbdev->kernel_ioctl);
 168 }
 169 EXPORT_SYMBOL(dvb_generic_ioctl);
 170
 171
 172 static int dvbdev_get_free_id (struct dvb_adapter *adap, int type)
 173 {
 174         u32 id = 0;
 175
 176         while (id < DVB_MAX_IDS) {
 177                 struct dvb_device *dev;
 178                 list_for_each_entry(dev, &adap->device_list, list_head)
 179                         if (dev->type == type && dev->id == id)
 180                                 goto skip;
 181                 return id;
 182 skip:
 183                 id++;
 184         }
 185         return -ENFILE;
 186 }
 187
 188 static void dvb_media_device_free(struct dvb_device *dvbdev)
 189 {
 190 #if defined(CONFIG_MEDIA_CONTROLLER_DVB)
 191         if (dvbdev->entity) {
 192                 media_device_unregister_entity(dvbdev->entity);
 193                 kfree(dvbdev->entity);
 194                 kfree(dvbdev->pads);
 195                 dvbdev->entity = NULL;
 196                 dvbdev->pads = NULL;
 197         }
 198
 199         if (dvbdev->tsout_entity) {
 200                 int i;
 201
 202                 for (i = 0; i < dvbdev->tsout_num_entities; i++) {
 203                         media_device_unregister_entity(&dvbdev->tsout_entity[i]);
 204                         kfree(dvbdev->tsout_entity[i].name);
 205                 }
 206                 kfree(dvbdev->tsout_entity);
 207                 kfree(dvbdev->tsout_pads);
 208                 dvbdev->tsout_entity = NULL;
 209                 dvbdev->tsout_pads = NULL;
 210
 211                 dvbdev->tsout_num_entities = 0;
 212         }
 213
 214         if (dvbdev->intf_devnode) {
 215                 media_devnode_remove(dvbdev->intf_devnode);
 216                 dvbdev->intf_devnode = NULL;
 217         }
 218
 219         if (dvbdev->adapter->conn) {
 220                 media_device_unregister_entity(dvbdev->adapter->conn);
 221                 kfree(dvbdev->adapter->conn);
 222                 dvbdev->adapter->conn = NULL;
 223                 kfree(dvbdev->adapter->conn_pads);
 224                 dvbdev->adapter->conn_pads = NULL;
 225         }
 226 #endif
 227 }
 228
 229 #if defined(CONFIG_MEDIA_CONTROLLER_DVB)
 230 static int dvb_create_tsout_entity(struct dvb_device *dvbdev,
 231                                     const char *name, int npads)
 232 {
 233         int i, ret = 0;
 234
 235         dvbdev->tsout_pads = kcalloc(npads, sizeof(*dvbdev->tsout_pads),
 236                                      GFP_KERNEL);
 237         if (!dvbdev->tsout_pads)
 238                 return -ENOMEM;
 239
 240         dvbdev->tsout_entity = kcalloc(npads, sizeof(*dvbdev->tsout_entity),
 241                                        GFP_KERNEL);
 242         if (!dvbdev->tsout_entity)
 243                 return -ENOMEM;
 244
 245         dvbdev->tsout_num_entities = npads;
 246
 247         for (i = 0; i < npads; i++) {
 248                 struct media_pad *pads = &dvbdev->tsout_pads[i];
 249                 struct media_entity *entity = &dvbdev->tsout_entity[i];
 250
 251                 entity->name = kasprintf(GFP_KERNEL, "%s #%d", name, i);
 252                 if (!entity->name)
 253                         return -ENOMEM;
 254
 255                 entity->function = MEDIA_ENT_F_IO_DTV;
 256                 pads->flags = MEDIA_PAD_FL_SINK;
 257
 258                 ret = media_entity_pads_init(entity, 1, pads);
 259                 if (ret < 0)
 260                         return ret;
 261
 262                 ret = media_device_register_entity(dvbdev->adapter->mdev,
 263                                                    entity);
 264                 if (ret < 0)
 265                         return ret;
 266         }
 267         return 0;
 268 }
 269
 270 #define DEMUX_TSOUT     "demux-tsout"
 271 #define DVR_TSOUT       "dvr-tsout"
 272
 273 static int dvb_create_media_entity(struct dvb_device *dvbdev,
 274                                    int type, int demux_sink_pads)
 275 {
 276         int i, ret, npads;
 277
 278         switch (type) {
 279         case DVB_DEVICE_FRONTEND:
 280                 npads = 2;
 281                 break;
 282         case DVB_DEVICE_DVR:
 283                 ret = dvb_create_tsout_entity(dvbdev, DVR_TSOUT,
 284                                               demux_sink_pads);
 285                 return ret;
 286         case DVB_DEVICE_DEMUX:
 287                 npads = 1 + demux_sink_pads;
 288                 ret = dvb_create_tsout_entity(dvbdev, DEMUX_TSOUT,
 289                                               demux_sink_pads);
 290                 if (ret < 0)
 291                         return ret;
 292                 break;
 293         case DVB_DEVICE_CA:
 294                 npads = 2;
 295                 break;
 296         case DVB_DEVICE_NET:
 297                 /*
 298                  * We should be creating entities for the MPE/ULE
 299                  * decapsulation hardware (or software implementation).
 300                  *
 301                  * However, the number of for the MPE/ULE decaps may not be
 302                  * fixed. As we don't have yet dynamic support for PADs at
 303                  * the Media Controller, let's not create the decap
 304                  * entities yet.
 305                  */
 306                 return 0;
 307         default:
 308                 return 0;
 309         }
 310
 311         dvbdev->entity = kzalloc(sizeof(*dvbdev->entity), GFP_KERNEL);
 312         if (!dvbdev->entity)
 313                 return -ENOMEM;
 314
 315         dvbdev->entity->name = dvbdev->name;
 316
 317         if (npads) {
 318                 dvbdev->pads = kcalloc(npads, sizeof(*dvbdev->pads),
 319                                        GFP_KERNEL);
 320                 if (!dvbdev->pads) {
 321                         kfree(dvbdev->entity);
 322                         return -ENOMEM;
 323                 }
 324         }
 325
 326         switch (type) {
 327         case DVB_DEVICE_FRONTEND:
 328                 dvbdev->entity->function = MEDIA_ENT_F_DTV_DEMOD;
 329                 dvbdev->pads[0].flags = MEDIA_PAD_FL_SINK;
 330                 dvbdev->pads[1].flags = MEDIA_PAD_FL_SOURCE;
 331                 break;
 332         case DVB_DEVICE_DEMUX:
 333                 dvbdev->entity->function = MEDIA_ENT_F_TS_DEMUX;
 334                 dvbdev->pads[0].flags = MEDIA_PAD_FL_SINK;
 335                 for (i = 1; i < npads; i++)
 336                         dvbdev->pads[i].flags = MEDIA_PAD_FL_SOURCE;
 337                 break;
 338         case DVB_DEVICE_CA:
 339                 dvbdev->entity->function = MEDIA_ENT_F_DTV_CA;
 340                 dvbdev->pads[0].flags = MEDIA_PAD_FL_SINK;
 341                 dvbdev->pads[1].flags = MEDIA_PAD_FL_SOURCE;
 342                 break;
 343         default:
 344                 /* Should never happen, as the first switch prevents it */
 345                 kfree(dvbdev->entity);
 346                 kfree(dvbdev->pads);
 347                 dvbdev->entity = NULL;
 348                 dvbdev->pads = NULL;
 349                 return 0;
 350         }
 351
 352         if (npads) {
 353                 ret = media_entity_pads_init(dvbdev->entity, npads, dvbdev->pads);
 354                 if (ret)
 355                         return ret;
 356         }
 357         ret = media_device_register_entity(dvbdev->adapter->mdev,
 358                                            dvbdev->entity);
 359         if (ret)
 360                 return ret;
 361
 362         pr_info("%s: media entity '%s' registered.\n",
 363                 __func__, dvbdev->entity->name);
 364
 365         return 0;
 366 }
 367 #endif
 368
 369 static int dvb_register_media_device(struct dvb_device *dvbdev,
 370                                      int type, int minor,
 371                                      unsigned demux_sink_pads)
 372 {
 373 #if defined(CONFIG_MEDIA_CONTROLLER_DVB)
 374         struct media_link *link;
 375         u32 intf_type;
 376         int ret;
 377
 378         if (!dvbdev->adapter->mdev)
 379                 return 0;
 380
 381         ret = dvb_create_media_entity(dvbdev, type, demux_sink_pads);
 382         if (ret)
 383                 return ret;
 384
 385         switch (type) {
 386         case DVB_DEVICE_FRONTEND:
 387                 intf_type = MEDIA_INTF_T_DVB_FE;
 388                 break;
 389         case DVB_DEVICE_DEMUX:
 390                 intf_type = MEDIA_INTF_T_DVB_DEMUX;
 391                 break;
 392         case DVB_DEVICE_DVR:
 393                 intf_type = MEDIA_INTF_T_DVB_DVR;
 394                 break;
 395         case DVB_DEVICE_CA:
 396                 intf_type = MEDIA_INTF_T_DVB_CA;
 397                 break;
 398         case DVB_DEVICE_NET:
 399                 intf_type = MEDIA_INTF_T_DVB_NET;
 400                 break;
 401         default:
 402                 return 0;
 403         }
 404
 405         dvbdev->intf_devnode = media_devnode_create(dvbdev->adapter->mdev,
 406                                                     intf_type, 0,
 407                                                     DVB_MAJOR, minor);
 408
 409         if (!dvbdev->intf_devnode)
 410                 return -ENOMEM;
 411
 412         /*
 413          * Create the "obvious" link, e. g. the ones that represent
 414          * a direct association between an interface and an entity.
 415          * Other links should be created elsewhere, like:
 416          *              DVB FE intf    -> tuner
 417          *              DVB demux intf -> dvr
 418          */
 419
 420         if (!dvbdev->entity)
 421                 return 0;
 422
 423         link = media_create_intf_link(dvbdev->entity, &dvbdev->intf_devnode->intf,
 424                                       MEDIA_LNK_FL_ENABLED);
 425         if (!link)
 426                 return -ENOMEM;
 427 #endif
 428         return 0;
 429 }
 430
 431 int dvb_register_device(struct dvb_adapter *adap, struct dvb_device **pdvbdev,
 432                         const struct dvb_device *template, void *priv, int type,
 433                         int demux_sink_pads)
 434 {
 435         struct dvb_device *dvbdev;
 436         struct file_operations *dvbdevfops;
 437         struct device *clsdev;
 438         int minor;
 439         int id, ret;
 440
 441         mutex_lock(&dvbdev_register_lock);
 442
 443         if ((id = dvbdev_get_free_id (adap, type)) < 0){
 444                 mutex_unlock(&dvbdev_register_lock);
 445                 *pdvbdev = NULL;
 446                 pr_err("%s: couldn't find free device id\n", __func__);
 447                 return -ENFILE;
 448         }
 449
 450         *pdvbdev = dvbdev = kzalloc(sizeof(*dvbdev), GFP_KERNEL);
 451
 452         if (!dvbdev){
 453                 mutex_unlock(&dvbdev_register_lock);
 454                 return -ENOMEM;
 455         }
 456
 457         dvbdevfops = kzalloc(sizeof(struct file_operations), GFP_KERNEL);
 458
 459         if (!dvbdevfops){
 460                 kfree (dvbdev);
 461                 mutex_unlock(&dvbdev_register_lock);
 462                 return -ENOMEM;
 463         }
 464
 465         memcpy(dvbdev, template, sizeof(struct dvb_device));
 466         dvbdev->type = type;
 467         dvbdev->id = id;
 468         dvbdev->adapter = adap;
 469         dvbdev->priv = priv;
 470         dvbdev->fops = dvbdevfops;
 471         init_waitqueue_head (&dvbdev->wait_queue);
 472
 473         memcpy(dvbdevfops, template->fops, sizeof(struct file_operations));
 474         dvbdevfops->owner = adap->module;
 475
 476         list_add_tail (&dvbdev->list_head, &adap->device_list);
 477
 478         down_write(&minor_rwsem);
 479 #ifdef CONFIG_DVB_DYNAMIC_MINORS
 480         for (minor = 0; minor < MAX_DVB_MINORS; minor++)
 481                 if (dvb_minors[minor] == NULL)
 482                         break;
 483
 484         if (minor == MAX_DVB_MINORS) {
 485                 kfree(dvbdevfops);
 486                 kfree(dvbdev);
 487                 up_write(&minor_rwsem);
 488                 mutex_unlock(&dvbdev_register_lock);
 489                 return -EINVAL;
 490         }
 491 #else
 492         minor = nums2minor(adap->num, type, id);
 493 #endif
 494
 495         dvbdev->minor = minor;
 496         dvb_minors[minor] = dvbdev;
 497         up_write(&minor_rwsem);
 498
 499         ret = dvb_register_media_device(dvbdev, type, minor, demux_sink_pads);
 500         if (ret) {
 501                 pr_err("%s: dvb_register_media_device failed to create the mediagraph\n",
 502                       __func__);
 503
 504                 dvb_media_device_free(dvbdev);
 505                 kfree(dvbdevfops);
 506                 kfree(dvbdev);
 507                 up_write(&minor_rwsem);
 508                 mutex_unlock(&dvbdev_register_lock);
 509                 return ret;
 510         }
 511
 512         mutex_unlock(&dvbdev_register_lock);
 513
 514         clsdev = device_create(dvb_class, adap->device,
 515                                MKDEV(DVB_MAJOR, minor),
 516                                dvbdev, "dvb%d.%s%d", adap->num, dnames[type], id);
 517         if (IS_ERR(clsdev)) {
 518                 pr_err("%s: failed to create device dvb%d.%s%d (%ld)\n",
 519                        __func__, adap->num, dnames[type], id, PTR_ERR(clsdev));
 520                 return PTR_ERR(clsdev);
 521         }
 522         dprintk("DVB: register adapter%d/%s%d @ minor: %i (0x%02x)\n",
 523                 adap->num, dnames[type], id, minor, minor);
 524
 525         return 0;
 526 }
 527 EXPORT_SYMBOL(dvb_register_device);
 528
 529
 530 void dvb_remove_device(struct dvb_device *dvbdev)
 531 {
 532         if (!dvbdev)
 533                 return;
 534
 535         down_write(&minor_rwsem);
 536         dvb_minors[dvbdev->minor] = NULL;
 537         up_write(&minor_rwsem);
 538
 539         dvb_media_device_free(dvbdev);
 540
 541         device_destroy(dvb_class, MKDEV(DVB_MAJOR, dvbdev->minor));
 542
 543         list_del (&dvbdev->list_head);
 544 }
 545 EXPORT_SYMBOL(dvb_remove_device);
 546
 547
 548 void dvb_free_device(struct dvb_device *dvbdev)
 549 {
 550         if (!dvbdev)
 551                 return;
 552
 553         kfree (dvbdev->fops);
 554         kfree (dvbdev);
 555 }
 556 EXPORT_SYMBOL(dvb_free_device);
 557
 558
 559 void dvb_unregister_device(struct dvb_device *dvbdev)
 560 {
 561         dvb_remove_device(dvbdev);
 562         dvb_free_device(dvbdev);
 563 }
 564 EXPORT_SYMBOL(dvb_unregister_device);
 565
 566
 567 #ifdef CONFIG_MEDIA_CONTROLLER_DVB
 568
 569 static int dvb_create_io_intf_links(struct dvb_adapter *adap,
 570                                     struct media_interface *intf,
 571                                     char *name)
 572 {
 573         struct media_device *mdev = adap->mdev;
 574         struct media_entity *entity;
 575         struct media_link *link;
 576
 577         media_device_for_each_entity(entity, mdev) {
 578                 if (entity->function == MEDIA_ENT_F_IO_DTV) {
 579                         if (strncmp(entity->name, name, strlen(name)))
 580                                 continue;
 581                         link = media_create_intf_link(entity, intf,
 582                                                       MEDIA_LNK_FL_ENABLED);
 583                         if (!link)
 584                                 return -ENOMEM;
 585                 }
 586         }
 587         return 0;
 588 }
 589
 590 int dvb_create_media_graph(struct dvb_adapter *adap,
 591                            bool create_rf_connector)
 592 {
 593         struct media_device *mdev = adap->mdev;
 594         struct media_entity *entity, *tuner = NULL, *demod = NULL, *conn;
 595         struct media_entity *demux = NULL, *ca = NULL;
 596         struct media_link *link;
 597         struct media_interface *intf;
 598         unsigned demux_pad = 0;
 599         unsigned dvr_pad = 0;
 600         unsigned ntuner = 0, ndemod = 0;
 601         int ret;
 602         static const char *connector_name = "Television";
 603
 604         if (!mdev)
 605                 return 0;
 606
 607         media_device_for_each_entity(entity, mdev) {
 608                 switch (entity->function) {
 609                 case MEDIA_ENT_F_TUNER:
 610                         tuner = entity;
 611                         ntuner++;
 612                         break;
 613                 case MEDIA_ENT_F_DTV_DEMOD:
 614                         demod = entity;
 615                         ndemod++;
 616                         break;
 617                 case MEDIA_ENT_F_TS_DEMUX:
 618                         demux = entity;
 619                         break;
 620                 case MEDIA_ENT_F_DTV_CA:
 621                         ca = entity;
 622                         break;
 623                 }
 624         }
 625
 626         /*
 627          * Prepare to signalize to media_create_pad_links() that multiple
 628          * entities of the same type exists and a 1:n or n:1 links need to be
 629          * created.
 630          * NOTE: if both tuner and demod have multiple instances, it is up
 631          * to the caller driver to create such links.
 632          */
 633         if (ntuner > 1)
 634                 tuner = NULL;
 635         if (ndemod > 1)
 636                 demod = NULL;
 637
 638         if (create_rf_connector) {
 639                 conn = kzalloc(sizeof(*conn), GFP_KERNEL);
 640                 if (!conn)
 641                         return -ENOMEM;
 642                 adap->conn = conn;
 643
 644                 adap->conn_pads = kzalloc(sizeof(*adap->conn_pads), GFP_KERNEL);
 645                 if (!adap->conn_pads)
 646                         return -ENOMEM;
 647
 648                 conn->flags = MEDIA_ENT_FL_CONNECTOR;
 649                 conn->function = MEDIA_ENT_F_CONN_RF;
 650                 conn->name = connector_name;
 651                 adap->conn_pads->flags = MEDIA_PAD_FL_SOURCE;
 652
 653                 ret = media_entity_pads_init(conn, 1, adap->conn_pads);
 654                 if (ret)
 655                         return ret;
 656
 657                 ret = media_device_register_entity(mdev, conn);
 658                 if (ret)
 659                         return ret;
 660
 661                 if (!ntuner)
 662                         ret = media_create_pad_links(mdev,
 663                                                      MEDIA_ENT_F_CONN_RF,
 664                                                      conn, 0,
 665                                                      MEDIA_ENT_F_DTV_DEMOD,
 666                                                      demod, 0,
 667                                                      MEDIA_LNK_FL_ENABLED,
 668                                                      false);
 669                 else
 670                         ret = media_create_pad_links(mdev,
 671                                                      MEDIA_ENT_F_CONN_RF,
 672                                                      conn, 0,
 673                                                      MEDIA_ENT_F_TUNER,
 674                                                      tuner, TUNER_PAD_RF_INPUT,
 675                                                      MEDIA_LNK_FL_ENABLED,
 676                                                      false);
 677                 if (ret)
 678                         return ret;
 679         }
 680
 681         if (ntuner && ndemod) {
 682                 ret = media_create_pad_links(mdev,
 683                                              MEDIA_ENT_F_TUNER,
 684                                              tuner, TUNER_PAD_OUTPUT,
 685                                              MEDIA_ENT_F_DTV_DEMOD,
 686                                              demod, 0, MEDIA_LNK_FL_ENABLED,
 687                                              false);
 688                 if (ret)
 689                         return ret;
 690         }
 691
 692         if (ndemod && demux) {
 693                 ret = media_create_pad_links(mdev,
 694                                              MEDIA_ENT_F_DTV_DEMOD,
 695                                              demod, 1,
 696                                              MEDIA_ENT_F_TS_DEMUX,
 697                                              demux, 0, MEDIA_LNK_FL_ENABLED,
 698                                              false);
 699                 if (ret)
 700                         return ret;
 701         }
 702         if (demux && ca) {
 703                 ret = media_create_pad_link(demux, 1, ca,
 704                                             0, MEDIA_LNK_FL_ENABLED);
 705                 if (ret)
 706                         return ret;
 707         }
 708
 709         /* Create demux links for each ringbuffer/pad */
 710         if (demux) {
 711                 media_device_for_each_entity(entity, mdev) {
 712                         if (entity->function == MEDIA_ENT_F_IO_DTV) {
 713                                 if (!strncmp(entity->name, DVR_TSOUT,
 714                                     strlen(DVR_TSOUT))) {
 715                                         ret = media_create_pad_link(demux,
 716                                                                 ++dvr_pad,
 717                                                             entity, 0, 0);
 718                                         if (ret)
 719                                                 return ret;
 720                                 }
 721                                 if (!strncmp(entity->name, DEMUX_TSOUT,
 722                                     strlen(DEMUX_TSOUT))) {
 723                                         ret = media_create_pad_link(demux,
 724                                                               ++demux_pad,
 725                                                             entity, 0, 0);
 726                                         if (ret)
 727                                                 return ret;
 728                                 }
 729                         }
 730                 }
 731         }
 732
 733         /* Create interface links for FE->tuner, DVR->demux and CA->ca */
 734         media_device_for_each_intf(intf, mdev) {
 735                 if (intf->type == MEDIA_INTF_T_DVB_CA && ca) {
 736                         link = media_create_intf_link(ca, intf,
 737                                                       MEDIA_LNK_FL_ENABLED);
 738                         if (!link)
 739                                 return -ENOMEM;
 740                 }
 741
 742                 if (intf->type == MEDIA_INTF_T_DVB_FE && tuner) {
 743                         link = media_create_intf_link(tuner, intf,
 744                                                       MEDIA_LNK_FL_ENABLED);
 745                         if (!link)
 746                                 return -ENOMEM;
 747                 }
 748 #if 0
 749                 /*
 750                  * Indirect link - let's not create yet, as we don't know how
 751                  *                 to handle indirect links, nor if this will
 752                  *                 actually be needed.
 753                  */
 754                 if (intf->type == MEDIA_INTF_T_DVB_DVR && demux) {
 755                         link = media_create_intf_link(demux, intf,
 756                                                       MEDIA_LNK_FL_ENABLED);
 757                         if (!link)
 758                                 return -ENOMEM;
 759                 }
 760 #endif
 761                 if (intf->type == MEDIA_INTF_T_DVB_DVR) {
 762                         ret = dvb_create_io_intf_links(adap, intf, DVR_TSOUT);
 763                         if (ret)
 764                                 return ret;
 765                 }
 766                 if (intf->type == MEDIA_INTF_T_DVB_DEMUX) {
 767                         ret = dvb_create_io_intf_links(adap, intf, DEMUX_TSOUT);
 768                         if (ret)
 769                                 return ret;
 770                 }
 771         }
 772         return 0;
 773 }
 774 EXPORT_SYMBOL_GPL(dvb_create_media_graph);
 775 #endif
 776
 777 static int dvbdev_check_free_adapter_num(int num)
 778 {
 779         struct list_head *entry;
 780         list_for_each(entry, &dvb_adapter_list) {
 781                 struct dvb_adapter *adap;
 782                 adap = list_entry(entry, struct dvb_adapter, list_head);
 783                 if (adap->num == num)
 784                         return 0;
 785         }
 786         return 1;
 787 }
 788
 789 static int dvbdev_get_free_adapter_num (void)
 790 {
 791         int num = 0;
 792
 793         while (num < DVB_MAX_ADAPTERS) {
 794                 if (dvbdev_check_free_adapter_num(num))
 795                         return num;
 796                 num++;
 797         }
 798
 799         return -ENFILE;
 800 }
 801
 802
 803 int dvb_register_adapter(struct dvb_adapter *adap, const char *name,
 804                          struct module *module, struct device *device,
 805                          short *adapter_nums)
 806 {
 807         int i, num;
 808
 809         mutex_lock(&dvbdev_register_lock);
 810
 811         for (i = 0; i < DVB_MAX_ADAPTERS; ++i) {
 812                 num = adapter_nums[i];
 813                 if (num >= 0  &&  num < DVB_MAX_ADAPTERS) {
 814                 /* use the one the driver asked for */
 815                         if (dvbdev_check_free_adapter_num(num))
 816                                 break;
 817                 } else {
 818                         num = dvbdev_get_free_adapter_num();
 819                         break;
 820                 }
 821                 num = -1;
 822         }
 823
 824         if (num < 0) {
 825                 mutex_unlock(&dvbdev_register_lock);
 826                 return -ENFILE;
 827         }
 828
 829         memset (adap, 0, sizeof(struct dvb_adapter));
 830         INIT_LIST_HEAD (&adap->device_list);
 831
 832         pr_info("DVB: registering new adapter (%s)\n", name);
 833
 834         adap->num = num;
 835         adap->name = name;
 836         adap->module = module;
 837         adap->device = device;
 838         adap->mfe_shared = 0;
 839         adap->mfe_dvbdev = NULL;
 840         mutex_init (&adap->mfe_lock);
 841
 842         list_add_tail (&adap->list_head, &dvb_adapter_list);
 843
 844         mutex_unlock(&dvbdev_register_lock);
 845
 846         return num;
 847 }
 848 EXPORT_SYMBOL(dvb_register_adapter);
 849
 850
 851 int dvb_unregister_adapter(struct dvb_adapter *adap)
 852 {
 853         mutex_lock(&dvbdev_register_lock);
 854         list_del (&adap->list_head);
 855         mutex_unlock(&dvbdev_register_lock);
 856         return 0;
 857 }
 858 EXPORT_SYMBOL(dvb_unregister_adapter);
 859
 860 /* if the miracle happens and "generic_usercopy()" is included into
 861    the kernel, then this can vanish. please don't make the mistake and
 862    define this as video_usercopy(). this will introduce a dependecy
 863    to the v4l "videodev.o" module, which is unnecessary for some
 864    cards (ie. the budget dvb-cards don't need the v4l module...) */
 865 int dvb_usercopy(struct file *file,
 866                      unsigned int cmd, unsigned long arg,
 867                      int (*func)(struct file *file,
 868                      unsigned int cmd, void *arg))
 869 {
 870         char    sbuf[128];
 871         void    *mbuf = NULL;
 872         void    *parg = NULL;
 873         int     err  = -EINVAL;
 874
 875         /*  Copy arguments into temp kernel buffer  */
 876         switch (_IOC_DIR(cmd)) {
 877         case _IOC_NONE:
 878                 /*
 879                  * For this command, the pointer is actually an integer
 880                  * argument.
 881                  */
 882                 parg = (void *) arg;
 883                 break;
 884         case _IOC_READ: /* some v4l ioctls are marked wrong ... */
 885         case _IOC_WRITE:
 886         case (_IOC_WRITE | _IOC_READ):
 887                 if (_IOC_SIZE(cmd) <= sizeof(sbuf)) {
 888                         parg = sbuf;
 889                 } else {
 890                         /* too big to allocate from stack */
 891                         mbuf = kmalloc(_IOC_SIZE(cmd), GFP_KERNEL);
 892                         if (NULL == mbuf)
 893                                 return -ENOMEM;
 894                         parg = mbuf;
 895                 }
 896
 897                 err = -EFAULT;
 898                 if (copy_from_user(parg, (void __user *)arg, _IOC_SIZE(cmd)))
 899                         goto out;
 900                 break;
 901         }
 902
 903         /* call driver */
 904         if ((err = func(file, cmd, parg)) == -ENOIOCTLCMD)
 905                 err = -ENOTTY;
 906
 907         if (err < 0)
 908                 goto out;
 909
 910         /*  Copy results into user buffer  */
 911         switch (_IOC_DIR(cmd))
 912         {
 913         case _IOC_READ:
 914         case (_IOC_WRITE | _IOC_READ):
 915                 if (copy_to_user((void __user *)arg, parg, _IOC_SIZE(cmd)))
 916                         err = -EFAULT;
 917                 break;
 918         }
 919
 920 out:
 921         kfree(mbuf);
 922         return err;
 923 }
 924
 925 static int dvb_uevent(struct device *dev, struct kobj_uevent_env *env)
 926 {
 927         struct dvb_device *dvbdev = dev_get_drvdata(dev);
 928
 929         add_uevent_var(env, "DVB_ADAPTER_NUM=%d", dvbdev->adapter->num);
 930         add_uevent_var(env, "DVB_DEVICE_TYPE=%s", dnames[dvbdev->type]);
 931         add_uevent_var(env, "DVB_DEVICE_NUM=%d", dvbdev->id);
 932         return 0;
 933 }
 934
 935 static char *dvb_devnode(struct device *dev, umode_t *mode)
 936 {
 937         struct dvb_device *dvbdev = dev_get_drvdata(dev);
 938
 939         return kasprintf(GFP_KERNEL, "dvb/adapter%d/%s%d",
 940                 dvbdev->adapter->num, dnames[dvbdev->type], dvbdev->id);
 941 }
 942
 943
 944 static int __init init_dvbdev(void)
 945 {
 946         int retval;
 947         dev_t dev = MKDEV(DVB_MAJOR, 0);
 948
 949         if ((retval = register_chrdev_region(dev, MAX_DVB_MINORS, "DVB")) != 0) {
 950                 pr_err("dvb-core: unable to get major %d\n", DVB_MAJOR);
 951                 return retval;
 952         }
 953
 954         cdev_init(&dvb_device_cdev, &dvb_device_fops);
 955         if ((retval = cdev_add(&dvb_device_cdev, dev, MAX_DVB_MINORS)) != 0) {
 956                 pr_err("dvb-core: unable register character device\n");
 957                 goto error;
 958         }
 959
 960         dvb_class = class_create(THIS_MODULE, "dvb");
 961         if (IS_ERR(dvb_class)) {
 962                 retval = PTR_ERR(dvb_class);
 963                 goto error;
 964         }
 965         dvb_class->dev_uevent = dvb_uevent;
 966         dvb_class->devnode = dvb_devnode;
 967         return 0;
 968
 969 error:
 970         cdev_del(&dvb_device_cdev);
 971         unregister_chrdev_region(dev, MAX_DVB_MINORS);
 972         return retval;
 973 }
 974
 975
 976 static void __exit exit_dvbdev(void)
 977 {
 978         class_destroy(dvb_class);
 979         cdev_del(&dvb_device_cdev);
 980         unregister_chrdev_region(MKDEV(DVB_MAJOR, 0), MAX_DVB_MINORS);
 981 }
 982
 983 subsys_initcall(init_dvbdev);
 984 module_exit(exit_dvbdev);
 985
 986 MODULE_DESCRIPTION("DVB Core Driver");
 987 MODULE_AUTHOR("Marcus Metzler, Ralph Metzler, Holger Waechtler");
 988 MODULE_LICENSE("GPL");