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 #endif
 217 }
 218
 219 static int dvb_create_tsout_entity(struct dvb_device *dvbdev,
 220                                     const char *name, int npads)
 221 {
 222 #if defined(CONFIG_MEDIA_CONTROLLER_DVB)
 223         int i, ret = 0;
 224
 225         dvbdev->tsout_pads = kcalloc(npads, sizeof(*dvbdev->tsout_pads),
 226                                      GFP_KERNEL);
 227         if (!dvbdev->tsout_pads)
 228                 return -ENOMEM;
 229
 230         dvbdev->tsout_entity = kcalloc(npads, sizeof(*dvbdev->tsout_entity),
 231                                        GFP_KERNEL);
 232         if (!dvbdev->tsout_entity)
 233                 return -ENOMEM;
 234
 235         dvbdev->tsout_num_entities = npads;
 236
 237         for (i = 0; i < npads; i++) {
 238                 struct media_pad *pads = &dvbdev->tsout_pads[i];
 239                 struct media_entity *entity = &dvbdev->tsout_entity[i];
 240
 241                 entity->name = kasprintf(GFP_KERNEL, "%s #%d", name, i);
 242                 if (!entity->name)
 243                         return -ENOMEM;
 244
 245                 entity->function = MEDIA_ENT_F_IO_DTV;
 246                 pads->flags = MEDIA_PAD_FL_SINK;
 247
 248                 ret = media_entity_init(entity, 1, pads);
 249                 if (ret < 0)
 250                         return ret;
 251
 252                 ret = media_device_register_entity(dvbdev->adapter->mdev,
 253                                                    entity);
 254                 if (ret < 0)
 255                         return ret;
 256         }
 257 #endif
 258         return 0;
 259 }
 260
 261 #define DEMUX_TSOUT     "demux-tsout"
 262 #define DVR_TSOUT       "dvr-tsout"
 263
 264 static int dvb_create_media_entity(struct dvb_device *dvbdev,
 265                                    int type, int demux_sink_pads)
 266 {
 267 #if defined(CONFIG_MEDIA_CONTROLLER_DVB)
 268         int i, ret, npads;
 269
 270         switch (type) {
 271         case DVB_DEVICE_FRONTEND:
 272                 npads = 2;
 273                 break;
 274         case DVB_DEVICE_DVR:
 275                 ret = dvb_create_tsout_entity(dvbdev, DVR_TSOUT,
 276                                               demux_sink_pads);
 277                 return ret;
 278         case DVB_DEVICE_DEMUX:
 279                 npads = 1 + demux_sink_pads;
 280                 ret = dvb_create_tsout_entity(dvbdev, DEMUX_TSOUT,
 281                                               demux_sink_pads);
 282                 if (ret < 0)
 283                         return ret;
 284                 break;
 285         case DVB_DEVICE_CA:
 286                 npads = 2;
 287                 break;
 288         case DVB_DEVICE_NET:
 289                 /*
 290                  * We should be creating entities for the MPE/ULE
 291                  * decapsulation hardware (or software implementation).
 292                  *
 293                  * However, the number of for the MPE/ULE decaps may not be
 294                  * fixed. As we don't have yet dynamic support for PADs at
 295                  * the Media Controller, let's not create the decap
 296                  * entities yet.
 297                  */
 298                 return 0;
 299         default:
 300                 return 0;
 301         }
 302
 303         dvbdev->entity = kzalloc(sizeof(*dvbdev->entity), GFP_KERNEL);
 304         if (!dvbdev->entity)
 305                 return -ENOMEM;
 306
 307         dvbdev->entity->name = dvbdev->name;
 308
 309         if (npads) {
 310                 dvbdev->pads = kcalloc(npads, sizeof(*dvbdev->pads),
 311                                        GFP_KERNEL);
 312                 if (!dvbdev->pads)
 313                         return -ENOMEM;
 314         }
 315
 316         switch (type) {
 317         case DVB_DEVICE_FRONTEND:
 318                 dvbdev->entity->function = MEDIA_ENT_F_DTV_DEMOD;
 319                 dvbdev->pads[0].flags = MEDIA_PAD_FL_SINK;
 320                 dvbdev->pads[1].flags = MEDIA_PAD_FL_SOURCE;
 321                 break;
 322         case DVB_DEVICE_DEMUX:
 323                 dvbdev->entity->function = MEDIA_ENT_F_TS_DEMUX;
 324                 dvbdev->pads[0].flags = MEDIA_PAD_FL_SINK;
 325                 for (i = 1; i < npads; i++)
 326                         dvbdev->pads[i].flags = MEDIA_PAD_FL_SOURCE;
 327                 break;
 328         case DVB_DEVICE_CA:
 329                 dvbdev->entity->function = MEDIA_ENT_F_DTV_CA;
 330                 dvbdev->pads[0].flags = MEDIA_PAD_FL_SINK;
 331                 dvbdev->pads[1].flags = MEDIA_PAD_FL_SOURCE;
 332                 break;
 333         default:
 334                 /* Should never happen, as the first switch prevents it */
 335                 kfree(dvbdev->entity);
 336                 kfree(dvbdev->pads);
 337                 dvbdev->entity = NULL;
 338                 dvbdev->pads = NULL;
 339                 return 0;
 340         }
 341
 342         if (npads) {
 343                 ret = media_entity_init(dvbdev->entity, npads, dvbdev->pads);
 344                 if (ret)
 345                         return ret;
 346         }
 347         ret = media_device_register_entity(dvbdev->adapter->mdev,
 348                                            dvbdev->entity);
 349         if (ret)
 350                 return (ret);
 351
 352         printk(KERN_DEBUG "%s: media entity '%s' registered.\n",
 353                 __func__, dvbdev->entity->name);
 354
 355 #endif
 356         return 0;
 357 }
 358
 359 static int dvb_register_media_device(struct dvb_device *dvbdev,
 360                                      int type, int minor,
 361                                      unsigned demux_sink_pads)
 362 {
 363 #if defined(CONFIG_MEDIA_CONTROLLER_DVB)
 364         struct media_link *link;
 365         u32 intf_type;
 366         int ret;
 367
 368         if (!dvbdev->adapter->mdev)
 369                 return 0;
 370
 371         ret = dvb_create_media_entity(dvbdev, type, demux_sink_pads);
 372         if (ret)
 373                 return ret;
 374
 375         switch (type) {
 376         case DVB_DEVICE_FRONTEND:
 377                 intf_type = MEDIA_INTF_T_DVB_FE;
 378                 break;
 379         case DVB_DEVICE_DEMUX:
 380                 intf_type = MEDIA_INTF_T_DVB_DEMUX;
 381                 break;
 382         case DVB_DEVICE_DVR:
 383                 intf_type = MEDIA_INTF_T_DVB_DVR;
 384                 break;
 385         case DVB_DEVICE_CA:
 386                 intf_type = MEDIA_INTF_T_DVB_CA;
 387                 break;
 388         case DVB_DEVICE_NET:
 389                 intf_type = MEDIA_INTF_T_DVB_NET;
 390                 break;
 391         default:
 392                 return 0;
 393         }
 394
 395         dvbdev->intf_devnode = media_devnode_create(dvbdev->adapter->mdev,
 396                                                     intf_type, 0,
 397                                                     DVB_MAJOR, minor,
 398                                                     GFP_KERNEL);
 399
 400         if (!dvbdev->intf_devnode)
 401                 return -ENOMEM;
 402
 403         /*
 404          * Create the "obvious" link, e. g. the ones that represent
 405          * a direct association between an interface and an entity.
 406          * Other links should be created elsewhere, like:
 407          *              DVB FE intf    -> tuner
 408          *              DVB demux intf -> dvr
 409          */
 410
 411         if (!dvbdev->entity)
 412                 return 0;
 413
 414         link = media_create_intf_link(dvbdev->entity, &dvbdev->intf_devnode->intf,
 415                                       MEDIA_LNK_FL_ENABLED);
 416         if (!link)
 417                 return -ENOMEM;
 418 #endif
 419         return 0;
 420 }
 421
 422 int dvb_register_device(struct dvb_adapter *adap, struct dvb_device **pdvbdev,
 423                         const struct dvb_device *template, void *priv, int type,
 424                         int demux_sink_pads)
 425 {
 426         struct dvb_device *dvbdev;
 427         struct file_operations *dvbdevfops;
 428         struct device *clsdev;
 429         int minor;
 430         int id, ret;
 431
 432         mutex_lock(&dvbdev_register_lock);
 433
 434         if ((id = dvbdev_get_free_id (adap, type)) < 0){
 435                 mutex_unlock(&dvbdev_register_lock);
 436                 *pdvbdev = NULL;
 437                 printk(KERN_ERR "%s: couldn't find free device id\n", __func__);
 438                 return -ENFILE;
 439         }
 440
 441         *pdvbdev = dvbdev = kzalloc(sizeof(*dvbdev), GFP_KERNEL);
 442
 443         if (!dvbdev){
 444                 mutex_unlock(&dvbdev_register_lock);
 445                 return -ENOMEM;
 446         }
 447
 448         dvbdevfops = kzalloc(sizeof(struct file_operations), GFP_KERNEL);
 449
 450         if (!dvbdevfops){
 451                 kfree (dvbdev);
 452                 mutex_unlock(&dvbdev_register_lock);
 453                 return -ENOMEM;
 454         }
 455
 456         memcpy(dvbdev, template, sizeof(struct dvb_device));
 457         dvbdev->type = type;
 458         dvbdev->id = id;
 459         dvbdev->adapter = adap;
 460         dvbdev->priv = priv;
 461         dvbdev->fops = dvbdevfops;
 462         init_waitqueue_head (&dvbdev->wait_queue);
 463
 464         memcpy(dvbdevfops, template->fops, sizeof(struct file_operations));
 465         dvbdevfops->owner = adap->module;
 466
 467         list_add_tail (&dvbdev->list_head, &adap->device_list);
 468
 469         down_write(&minor_rwsem);
 470 #ifdef CONFIG_DVB_DYNAMIC_MINORS
 471         for (minor = 0; minor < MAX_DVB_MINORS; minor++)
 472                 if (dvb_minors[minor] == NULL)
 473                         break;
 474
 475         if (minor == MAX_DVB_MINORS) {
 476                 kfree(dvbdevfops);
 477                 kfree(dvbdev);
 478                 up_write(&minor_rwsem);
 479                 mutex_unlock(&dvbdev_register_lock);
 480                 return -EINVAL;
 481         }
 482 #else
 483         minor = nums2minor(adap->num, type, id);
 484 #endif
 485
 486         dvbdev->minor = minor;
 487         dvb_minors[minor] = dvbdev;
 488         up_write(&minor_rwsem);
 489
 490         ret = dvb_register_media_device(dvbdev, type, minor, demux_sink_pads);
 491         if (ret) {
 492                 printk(KERN_ERR
 493                       "%s: dvb_register_media_device failed to create the mediagraph\n",
 494                       __func__);
 495
 496                 dvb_media_device_free(dvbdev);
 497                 kfree(dvbdevfops);
 498                 kfree(dvbdev);
 499                 up_write(&minor_rwsem);
 500                 mutex_unlock(&dvbdev_register_lock);
 501                 return ret;
 502         }
 503
 504         mutex_unlock(&dvbdev_register_lock);
 505
 506         clsdev = device_create(dvb_class, adap->device,
 507                                MKDEV(DVB_MAJOR, minor),
 508                                dvbdev, "dvb%d.%s%d", adap->num, dnames[type], id);
 509         if (IS_ERR(clsdev)) {
 510                 printk(KERN_ERR "%s: failed to create device dvb%d.%s%d (%ld)\n",
 511                        __func__, adap->num, dnames[type], id, PTR_ERR(clsdev));
 512                 return PTR_ERR(clsdev);
 513         }
 514         dprintk(KERN_DEBUG "DVB: register adapter%d/%s%d @ minor: %i (0x%02x)\n",
 515                 adap->num, dnames[type], id, minor, minor);
 516
 517         return 0;
 518 }
 519 EXPORT_SYMBOL(dvb_register_device);
 520
 521
 522 void dvb_unregister_device(struct dvb_device *dvbdev)
 523 {
 524         if (!dvbdev)
 525                 return;
 526
 527         down_write(&minor_rwsem);
 528         dvb_minors[dvbdev->minor] = NULL;
 529         up_write(&minor_rwsem);
 530
 531         dvb_media_device_free(dvbdev);
 532
 533         device_destroy(dvb_class, MKDEV(DVB_MAJOR, dvbdev->minor));
 534
 535         list_del (&dvbdev->list_head);
 536         kfree (dvbdev->fops);
 537         kfree (dvbdev);
 538 }
 539 EXPORT_SYMBOL(dvb_unregister_device);
 540
 541
 542 #ifdef CONFIG_MEDIA_CONTROLLER_DVB
 543 int dvb_create_media_graph(struct dvb_adapter *adap)
 544 {
 545         struct media_device *mdev = adap->mdev;
 546         struct media_entity *entity, *tuner = NULL, *demod = NULL;
 547         struct media_entity *demux = NULL, *ca = NULL;
 548         struct media_link *link;
 549         struct media_interface *intf;
 550         unsigned demux_pad = 0;
 551         unsigned dvr_pad = 0;
 552         int ret;
 553
 554         if (!mdev)
 555                 return 0;
 556
 557         media_device_for_each_entity(entity, mdev) {
 558                 switch (entity->function) {
 559                 case MEDIA_ENT_F_TUNER:
 560                         tuner = entity;
 561                         break;
 562                 case MEDIA_ENT_F_DTV_DEMOD:
 563                         demod = entity;
 564                         break;
 565                 case MEDIA_ENT_F_TS_DEMUX:
 566                         demux = entity;
 567                         break;
 568                 case MEDIA_ENT_F_DTV_CA:
 569                         ca = entity;
 570                         break;
 571                 }
 572         }
 573
 574         if (tuner && demod) {
 575                 ret = media_create_pad_link(tuner, TUNER_PAD_IF_OUTPUT,
 576                                             demod, 0, MEDIA_LNK_FL_ENABLED);
 577                 if (ret)
 578                         return ret;
 579         }
 580
 581         if (demod && demux) {
 582                 ret = media_create_pad_link(demod, 1, demux,
 583                                             0, MEDIA_LNK_FL_ENABLED);
 584                 if (ret)
 585                         return -ENOMEM;
 586         }
 587         if (demux && ca) {
 588                 ret = media_create_pad_link(demux, 1, ca,
 589                                             0, MEDIA_LNK_FL_ENABLED);
 590                 if (!ret)
 591                         return -ENOMEM;
 592         }
 593
 594         /* Create demux links for each ringbuffer/pad */
 595         if (demux) {
 596                 media_device_for_each_entity(entity, mdev) {
 597                         if (entity->function == MEDIA_ENT_F_IO_DTV) {
 598                                 if (!strncmp(entity->name, DVR_TSOUT,
 599                                     strlen(DVR_TSOUT))) {
 600                                         ret = media_create_pad_link(demux,
 601                                                                 ++dvr_pad,
 602                                                             entity, 0, 0);
 603                                         if (ret)
 604                                                 return ret;
 605                                 }
 606                                 if (!strncmp(entity->name, DEMUX_TSOUT,
 607                                     strlen(DEMUX_TSOUT))) {
 608                                         ret = media_create_pad_link(demux,
 609                                                               ++demux_pad,
 610                                                             entity, 0, 0);
 611                                         if (ret)
 612                                                 return ret;
 613                                 }
 614                         }
 615                 }
 616         }
 617
 618         /* Create indirect interface links for FE->tuner, DVR->demux and CA->ca */
 619         media_device_for_each_intf(intf, mdev) {
 620                 if (intf->type == MEDIA_INTF_T_DVB_CA && ca) {
 621                         link = media_create_intf_link(ca, intf,
 622                                                       MEDIA_LNK_FL_ENABLED);
 623                         if (!link)
 624                                 return -ENOMEM;
 625                 }
 626
 627                 if (intf->type == MEDIA_INTF_T_DVB_FE && tuner) {
 628                         link = media_create_intf_link(tuner, intf,
 629                                                       MEDIA_LNK_FL_ENABLED);
 630                         if (!link)
 631                                 return -ENOMEM;
 632                 }
 633
 634                 if (intf->type == MEDIA_INTF_T_DVB_DVR && demux) {
 635                         link = media_create_intf_link(demux, intf,
 636                                                       MEDIA_LNK_FL_ENABLED);
 637                         if (!link)
 638                                 return -ENOMEM;
 639                 }
 640
 641                 media_device_for_each_entity(entity, mdev) {
 642                         if (entity->function == MEDIA_ENT_F_IO_DTV) {
 643                                 if (!strcmp(entity->name, DVR_TSOUT)) {
 644                                         link = media_create_intf_link(entity,
 645                                                         intf,
 646                                                         MEDIA_LNK_FL_ENABLED);
 647                                         if (!link)
 648                                                 return -ENOMEM;
 649                                 }
 650                                 if (!strcmp(entity->name, DEMUX_TSOUT)) {
 651                                         link = media_create_intf_link(entity,
 652                                                         intf,
 653                                                         MEDIA_LNK_FL_ENABLED);
 654                                         if (!link)
 655                                                 return -ENOMEM;
 656                                 }
 657                                 break;
 658                         }
 659                 }
 660         }
 661         return 0;
 662 }
 663 EXPORT_SYMBOL_GPL(dvb_create_media_graph);
 664 #endif
 665
 666 static int dvbdev_check_free_adapter_num(int num)
 667 {
 668         struct list_head *entry;
 669         list_for_each(entry, &dvb_adapter_list) {
 670                 struct dvb_adapter *adap;
 671                 adap = list_entry(entry, struct dvb_adapter, list_head);
 672                 if (adap->num == num)
 673                         return 0;
 674         }
 675         return 1;
 676 }
 677
 678 static int dvbdev_get_free_adapter_num (void)
 679 {
 680         int num = 0;
 681
 682         while (num < DVB_MAX_ADAPTERS) {
 683                 if (dvbdev_check_free_adapter_num(num))
 684                         return num;
 685                 num++;
 686         }
 687
 688         return -ENFILE;
 689 }
 690
 691
 692 int dvb_register_adapter(struct dvb_adapter *adap, const char *name,
 693                          struct module *module, struct device *device,
 694                          short *adapter_nums)
 695 {
 696         int i, num;
 697
 698         mutex_lock(&dvbdev_register_lock);
 699
 700         for (i = 0; i < DVB_MAX_ADAPTERS; ++i) {
 701                 num = adapter_nums[i];
 702                 if (num >= 0  &&  num < DVB_MAX_ADAPTERS) {
 703                 /* use the one the driver asked for */
 704                         if (dvbdev_check_free_adapter_num(num))
 705                                 break;
 706                 } else {
 707                         num = dvbdev_get_free_adapter_num();
 708                         break;
 709                 }
 710                 num = -1;
 711         }
 712
 713         if (num < 0) {
 714                 mutex_unlock(&dvbdev_register_lock);
 715                 return -ENFILE;
 716         }
 717
 718         memset (adap, 0, sizeof(struct dvb_adapter));
 719         INIT_LIST_HEAD (&adap->device_list);
 720
 721         printk(KERN_INFO "DVB: registering new adapter (%s)\n", name);
 722
 723         adap->num = num;
 724         adap->name = name;
 725         adap->module = module;
 726         adap->device = device;
 727         adap->mfe_shared = 0;
 728         adap->mfe_dvbdev = NULL;
 729         mutex_init (&adap->mfe_lock);
 730
 731         list_add_tail (&adap->list_head, &dvb_adapter_list);
 732
 733         mutex_unlock(&dvbdev_register_lock);
 734
 735         return num;
 736 }
 737 EXPORT_SYMBOL(dvb_register_adapter);
 738
 739
 740 int dvb_unregister_adapter(struct dvb_adapter *adap)
 741 {
 742         mutex_lock(&dvbdev_register_lock);
 743         list_del (&adap->list_head);
 744         mutex_unlock(&dvbdev_register_lock);
 745         return 0;
 746 }
 747 EXPORT_SYMBOL(dvb_unregister_adapter);
 748
 749 /* if the miracle happens and "generic_usercopy()" is included into
 750    the kernel, then this can vanish. please don't make the mistake and
 751    define this as video_usercopy(). this will introduce a dependecy
 752    to the v4l "videodev.o" module, which is unnecessary for some
 753    cards (ie. the budget dvb-cards don't need the v4l module...) */
 754 int dvb_usercopy(struct file *file,
 755                      unsigned int cmd, unsigned long arg,
 756                      int (*func)(struct file *file,
 757                      unsigned int cmd, void *arg))
 758 {
 759         char    sbuf[128];
 760         void    *mbuf = NULL;
 761         void    *parg = NULL;
 762         int     err  = -EINVAL;
 763
 764         /*  Copy arguments into temp kernel buffer  */
 765         switch (_IOC_DIR(cmd)) {
 766         case _IOC_NONE:
 767                 /*
 768                  * For this command, the pointer is actually an integer
 769                  * argument.
 770                  */
 771                 parg = (void *) arg;
 772                 break;
 773         case _IOC_READ: /* some v4l ioctls are marked wrong ... */
 774         case _IOC_WRITE:
 775         case (_IOC_WRITE | _IOC_READ):
 776                 if (_IOC_SIZE(cmd) <= sizeof(sbuf)) {
 777                         parg = sbuf;
 778                 } else {
 779                         /* too big to allocate from stack */
 780                         mbuf = kmalloc(_IOC_SIZE(cmd),GFP_KERNEL);
 781                         if (NULL == mbuf)
 782                                 return -ENOMEM;
 783                         parg = mbuf;
 784                 }
 785
 786                 err = -EFAULT;
 787                 if (copy_from_user(parg, (void __user *)arg, _IOC_SIZE(cmd)))
 788                         goto out;
 789                 break;
 790         }
 791
 792         /* call driver */
 793         if ((err = func(file, cmd, parg)) == -ENOIOCTLCMD)
 794                 err = -ENOTTY;
 795
 796         if (err < 0)
 797                 goto out;
 798
 799         /*  Copy results into user buffer  */
 800         switch (_IOC_DIR(cmd))
 801         {
 802         case _IOC_READ:
 803         case (_IOC_WRITE | _IOC_READ):
 804                 if (copy_to_user((void __user *)arg, parg, _IOC_SIZE(cmd)))
 805                         err = -EFAULT;
 806                 break;
 807         }
 808
 809 out:
 810         kfree(mbuf);
 811         return err;
 812 }
 813
 814 static int dvb_uevent(struct device *dev, struct kobj_uevent_env *env)
 815 {
 816         struct dvb_device *dvbdev = dev_get_drvdata(dev);
 817
 818         add_uevent_var(env, "DVB_ADAPTER_NUM=%d", dvbdev->adapter->num);
 819         add_uevent_var(env, "DVB_DEVICE_TYPE=%s", dnames[dvbdev->type]);
 820         add_uevent_var(env, "DVB_DEVICE_NUM=%d", dvbdev->id);
 821         return 0;
 822 }
 823
 824 static char *dvb_devnode(struct device *dev, umode_t *mode)
 825 {
 826         struct dvb_device *dvbdev = dev_get_drvdata(dev);
 827
 828         return kasprintf(GFP_KERNEL, "dvb/adapter%d/%s%d",
 829                 dvbdev->adapter->num, dnames[dvbdev->type], dvbdev->id);
 830 }
 831
 832
 833 static int __init init_dvbdev(void)
 834 {
 835         int retval;
 836         dev_t dev = MKDEV(DVB_MAJOR, 0);
 837
 838         if ((retval = register_chrdev_region(dev, MAX_DVB_MINORS, "DVB")) != 0) {
 839                 printk(KERN_ERR "dvb-core: unable to get major %d\n", DVB_MAJOR);
 840                 return retval;
 841         }
 842
 843         cdev_init(&dvb_device_cdev, &dvb_device_fops);
 844         if ((retval = cdev_add(&dvb_device_cdev, dev, MAX_DVB_MINORS)) != 0) {
 845                 printk(KERN_ERR "dvb-core: unable register character device\n");
 846                 goto error;
 847         }
 848
 849         dvb_class = class_create(THIS_MODULE, "dvb");
 850         if (IS_ERR(dvb_class)) {
 851                 retval = PTR_ERR(dvb_class);
 852                 goto error;
 853         }
 854         dvb_class->dev_uevent = dvb_uevent;
 855         dvb_class->devnode = dvb_devnode;
 856         return 0;
 857
 858 error:
 859         cdev_del(&dvb_device_cdev);
 860         unregister_chrdev_region(dev, MAX_DVB_MINORS);
 861         return retval;
 862 }
 863
 864
 865 static void __exit exit_dvbdev(void)
 866 {
 867         class_destroy(dvb_class);
 868         cdev_del(&dvb_device_cdev);
 869         unregister_chrdev_region(MKDEV(DVB_MAJOR, 0), MAX_DVB_MINORS);
 870 }
 871
 872 subsys_initcall(init_dvbdev);
 873 module_exit(exit_dvbdev);
 874
 875 MODULE_DESCRIPTION("DVB Core Driver");
 876 MODULE_AUTHOR("Marcus Metzler, Ralph Metzler, Holger Waechtler");
 877 MODULE_LICENSE("GPL");