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