drivers/media/dvb-core/dmxdev.c

   1 /*
   2  * dmxdev.c - DVB demultiplexer device
   3  *
   4  * Copyright (C) 2000 Ralph Metzler & Marcus Metzler
   5  *                    for convergence integrated media GmbH
   6  *
   7  * This program is free software; you can redistribute it and/or
   8  * modify it under the terms of the GNU Lesser General Public License
   9  * as published by the Free Software Foundation; either version 2.1
  10  * of the License, or (at your option) any later version.
  11  *
  12  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  * GNU General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU Lesser General Public License
  18  * along with this program; if not, write to the Free Software
  19  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
  20  *
  21  */
  22
  23 #include <linux/sched.h>
  24 #include <linux/spinlock.h>
  25 #include <linux/slab.h>
  26 #include <linux/vmalloc.h>
  27 #include <linux/module.h>
  28 #include <linux/poll.h>
  29 #include <linux/ioctl.h>
  30 #include <linux/wait.h>
  31 #include <asm/uaccess.h>
  32 #include "dmxdev.h"
  33
  34 static int debug;
  35
  36 module_param(debug, int, 0644);
  37 MODULE_PARM_DESC(debug, "Turn on/off debugging (default:off).");
  38
  39 #define dprintk if (debug) printk
  40
  41 static int dvb_dmxdev_buffer_write(struct dvb_ringbuffer *buf,
  42                                    const u8 *src, size_t len)
  43 {
  44         ssize_t free;
  45
  46         if (!len)
  47                 return 0;
  48         if (!buf->data)
  49                 return 0;
  50
  51         free = dvb_ringbuffer_free(buf);
  52         if (len > free) {
  53                 dprintk("dmxdev: buffer overflow\n");
  54                 return -EOVERFLOW;
  55         }
  56
  57         return dvb_ringbuffer_write(buf, src, len);
  58 }
  59
  60 static ssize_t dvb_dmxdev_buffer_read(struct dvb_ringbuffer *src,
  61                                       int non_blocking, char __user *buf,
  62                                       size_t count, loff_t *ppos)
  63 {
  64         size_t todo;
  65         ssize_t avail;
  66         ssize_t ret = 0;
  67
  68         if (!src->data)
  69                 return 0;
  70
  71         if (src->error) {
  72                 ret = src->error;
  73                 dvb_ringbuffer_flush(src);
  74                 return ret;
  75         }
  76
  77         for (todo = count; todo > 0; todo -= ret) {
  78                 if (non_blocking && dvb_ringbuffer_empty(src)) {
  79                         ret = -EWOULDBLOCK;
  80                         break;
  81                 }
  82
  83                 ret = wait_event_interruptible(src->queue,
  84                                                !dvb_ringbuffer_empty(src) ||
  85                                                (src->error != 0));
  86                 if (ret < 0)
  87                         break;
  88
  89                 if (src->error) {
  90                         ret = src->error;
  91                         dvb_ringbuffer_flush(src);
  92                         break;
  93                 }
  94
  95                 avail = dvb_ringbuffer_avail(src);
  96                 if (avail > todo)
  97                         avail = todo;
  98
  99                 ret = dvb_ringbuffer_read_user(src, buf, avail);
 100                 if (ret < 0)
 101                         break;
 102
 103                 buf += ret;
 104         }
 105
 106         return (count - todo) ? (count - todo) : ret;
 107 }
 108
 109 static struct dmx_frontend *get_fe(struct dmx_demux *demux, int type)
 110 {
 111         struct list_head *head, *pos;
 112
 113         head = demux->get_frontends(demux);
 114         if (!head)
 115                 return NULL;
 116         list_for_each(pos, head)
 117                 if (DMX_FE_ENTRY(pos)->source == type)
 118                         return DMX_FE_ENTRY(pos);
 119
 120         return NULL;
 121 }
 122
 123 static int dvb_dvr_open(struct inode *inode, struct file *file)
 124 {
 125         struct dvb_device *dvbdev = file->private_data;
 126         struct dmxdev *dmxdev = dvbdev->priv;
 127         struct dmx_frontend *front;
 128
 129         dprintk("function : %s\n", __func__);
 130
 131         if (mutex_lock_interruptible(&dmxdev->mutex))
 132                 return -ERESTARTSYS;
 133
 134         if (dmxdev->exit) {
 135                 mutex_unlock(&dmxdev->mutex);
 136                 return -ENODEV;
 137         }
 138
 139         if ((file->f_flags & O_ACCMODE) == O_RDWR) {
 140                 if (!(dmxdev->capabilities & DMXDEV_CAP_DUPLEX)) {
 141                         mutex_unlock(&dmxdev->mutex);
 142                         return -EOPNOTSUPP;
 143                 }
 144         }
 145
 146         if ((file->f_flags & O_ACCMODE) == O_RDONLY) {
 147                 void *mem;
 148                 if (!dvbdev->readers) {
 149                         mutex_unlock(&dmxdev->mutex);
 150                         return -EBUSY;
 151                 }
 152                 mem = vmalloc(DVR_BUFFER_SIZE);
 153                 if (!mem) {
 154                         mutex_unlock(&dmxdev->mutex);
 155                         return -ENOMEM;
 156                 }
 157                 dvb_ringbuffer_init(&dmxdev->dvr_buffer, mem, DVR_BUFFER_SIZE);
 158                 dvbdev->readers--;
 159         }
 160
 161         if ((file->f_flags & O_ACCMODE) == O_WRONLY) {
 162                 dmxdev->dvr_orig_fe = dmxdev->demux->frontend;
 163
 164                 if (!dmxdev->demux->write) {
 165                         mutex_unlock(&dmxdev->mutex);
 166                         return -EOPNOTSUPP;
 167                 }
 168
 169                 front = get_fe(dmxdev->demux, DMX_MEMORY_FE);
 170
 171                 if (!front) {
 172                         mutex_unlock(&dmxdev->mutex);
 173                         return -EINVAL;
 174                 }
 175                 dmxdev->demux->disconnect_frontend(dmxdev->demux);
 176                 dmxdev->demux->connect_frontend(dmxdev->demux, front);
 177         }
 178         dvbdev->users++;
 179         mutex_unlock(&dmxdev->mutex);
 180         return 0;
 181 }
 182
 183 static int dvb_dvr_release(struct inode *inode, struct file *file)
 184 {
 185         struct dvb_device *dvbdev = file->private_data;
 186         struct dmxdev *dmxdev = dvbdev->priv;
 187
 188         mutex_lock(&dmxdev->mutex);
 189
 190         if ((file->f_flags & O_ACCMODE) == O_WRONLY) {
 191                 dmxdev->demux->disconnect_frontend(dmxdev->demux);
 192                 dmxdev->demux->connect_frontend(dmxdev->demux,
 193                                                 dmxdev->dvr_orig_fe);
 194         }
 195         if ((file->f_flags & O_ACCMODE) == O_RDONLY) {
 196                 dvbdev->readers++;
 197                 if (dmxdev->dvr_buffer.data) {
 198                         void *mem = dmxdev->dvr_buffer.data;
 199                         mb();
 200                         spin_lock_irq(&dmxdev->lock);
 201                         dmxdev->dvr_buffer.data = NULL;
 202                         spin_unlock_irq(&dmxdev->lock);
 203                         vfree(mem);
 204                 }
 205         }
 206         /* TODO */
 207         dvbdev->users--;
 208         if (dvbdev->users == 1 && dmxdev->exit == 1) {
 209                 fops_put(file->f_op);
 210                 file->f_op = NULL;
 211                 mutex_unlock(&dmxdev->mutex);
 212                 wake_up(&dvbdev->wait_queue);
 213         } else
 214                 mutex_unlock(&dmxdev->mutex);
 215
 216         return 0;
 217 }
 218
 219 static ssize_t dvb_dvr_write(struct file *file, const char __user *buf,
 220                              size_t count, loff_t *ppos)
 221 {
 222         struct dvb_device *dvbdev = file->private_data;
 223         struct dmxdev *dmxdev = dvbdev->priv;
 224         int ret;
 225
 226         if (!dmxdev->demux->write)
 227                 return -EOPNOTSUPP;
 228         if ((file->f_flags & O_ACCMODE) != O_WRONLY)
 229                 return -EINVAL;
 230         if (mutex_lock_interruptible(&dmxdev->mutex))
 231                 return -ERESTARTSYS;
 232
 233         if (dmxdev->exit) {
 234                 mutex_unlock(&dmxdev->mutex);
 235                 return -ENODEV;
 236         }
 237         ret = dmxdev->demux->write(dmxdev->demux, buf, count);
 238         mutex_unlock(&dmxdev->mutex);
 239         return ret;
 240 }
 241
 242 static ssize_t dvb_dvr_read(struct file *file, char __user *buf, size_t count,
 243                             loff_t *ppos)
 244 {
 245         struct dvb_device *dvbdev = file->private_data;
 246         struct dmxdev *dmxdev = dvbdev->priv;
 247
 248         if (dmxdev->exit)
 249                 return -ENODEV;
 250
 251         return dvb_dmxdev_buffer_read(&dmxdev->dvr_buffer,
 252                                       file->f_flags & O_NONBLOCK,
 253                                       buf, count, ppos);
 254 }
 255
 256 static int dvb_dvr_set_buffer_size(struct dmxdev *dmxdev,
 257                                       unsigned long size)
 258 {
 259         struct dvb_ringbuffer *buf = &dmxdev->dvr_buffer;
 260         void *newmem;
 261         void *oldmem;
 262
 263         dprintk("function : %s\n", __func__);
 264
 265         if (buf->size == size)
 266                 return 0;
 267         if (!size)
 268                 return -EINVAL;
 269
 270         newmem = vmalloc(size);
 271         if (!newmem)
 272                 return -ENOMEM;
 273
 274         oldmem = buf->data;
 275
 276         spin_lock_irq(&dmxdev->lock);
 277         buf->data = newmem;
 278         buf->size = size;
 279
 280         /* reset and not flush in case the buffer shrinks */
 281         dvb_ringbuffer_reset(buf);
 282         spin_unlock_irq(&dmxdev->lock);
 283
 284         vfree(oldmem);
 285
 286         return 0;
 287 }
 288
 289 static inline void dvb_dmxdev_filter_state_set(struct dmxdev_filter
 290                                                *dmxdevfilter, int state)
 291 {
 292         spin_lock_irq(&dmxdevfilter->dev->lock);
 293         dmxdevfilter->state = state;
 294         spin_unlock_irq(&dmxdevfilter->dev->lock);
 295 }
 296
 297 static int dvb_dmxdev_set_buffer_size(struct dmxdev_filter *dmxdevfilter,
 298                                       unsigned long size)
 299 {
 300         struct dvb_ringbuffer *buf = &dmxdevfilter->buffer;
 301         void *newmem;
 302         void *oldmem;
 303
 304         if (buf->size == size)
 305                 return 0;
 306         if (!size)
 307                 return -EINVAL;
 308         if (dmxdevfilter->state >= DMXDEV_STATE_GO)
 309                 return -EBUSY;
 310
 311         newmem = vmalloc(size);
 312         if (!newmem)
 313                 return -ENOMEM;
 314
 315         oldmem = buf->data;
 316
 317         spin_lock_irq(&dmxdevfilter->dev->lock);
 318         buf->data = newmem;
 319         buf->size = size;
 320
 321         /* reset and not flush in case the buffer shrinks */
 322         dvb_ringbuffer_reset(buf);
 323         spin_unlock_irq(&dmxdevfilter->dev->lock);
 324
 325         vfree(oldmem);
 326
 327         return 0;
 328 }
 329
 330 static void dvb_dmxdev_filter_timeout(unsigned long data)
 331 {
 332         struct dmxdev_filter *dmxdevfilter = (struct dmxdev_filter *)data;
 333
 334         dmxdevfilter->buffer.error = -ETIMEDOUT;
 335         spin_lock_irq(&dmxdevfilter->dev->lock);
 336         dmxdevfilter->state = DMXDEV_STATE_TIMEDOUT;
 337         spin_unlock_irq(&dmxdevfilter->dev->lock);
 338         wake_up(&dmxdevfilter->buffer.queue);
 339 }
 340
 341 static void dvb_dmxdev_filter_timer(struct dmxdev_filter *dmxdevfilter)
 342 {
 343         struct dmx_sct_filter_params *para = &dmxdevfilter->params.sec;
 344
 345         del_timer(&dmxdevfilter->timer);
 346         if (para->timeout) {
 347                 dmxdevfilter->timer.function = dvb_dmxdev_filter_timeout;
 348                 dmxdevfilter->timer.data = (unsigned long)dmxdevfilter;
 349                 dmxdevfilter->timer.expires =
 350                     jiffies + 1 + (HZ / 2 + HZ * para->timeout) / 1000;
 351                 add_timer(&dmxdevfilter->timer);
 352         }
 353 }
 354
 355 static int dvb_dmxdev_section_callback(const u8 *buffer1, size_t buffer1_len,
 356                                        const u8 *buffer2, size_t buffer2_len,
 357                                        struct dmx_section_filter *filter,
 358                                        enum dmx_success success)
 359 {
 360         struct dmxdev_filter *dmxdevfilter = filter->priv;
 361         int ret;
 362
 363         if (dmxdevfilter->buffer.error) {
 364                 wake_up(&dmxdevfilter->buffer.queue);
 365                 return 0;
 366         }
 367         spin_lock(&dmxdevfilter->dev->lock);
 368         if (dmxdevfilter->state != DMXDEV_STATE_GO) {
 369                 spin_unlock(&dmxdevfilter->dev->lock);
 370                 return 0;
 371         }
 372         del_timer(&dmxdevfilter->timer);
 373         dprintk("dmxdev: section callback %*ph\n", 6, buffer1);
 374         ret = dvb_dmxdev_buffer_write(&dmxdevfilter->buffer, buffer1,
 375                                       buffer1_len);
 376         if (ret == buffer1_len) {
 377                 ret = dvb_dmxdev_buffer_write(&dmxdevfilter->buffer, buffer2,
 378                                               buffer2_len);
 379         }
 380         if (ret < 0) {
 381                 dvb_ringbuffer_flush(&dmxdevfilter->buffer);
 382                 dmxdevfilter->buffer.error = ret;
 383         }
 384         if (dmxdevfilter->params.sec.flags & DMX_ONESHOT)
 385                 dmxdevfilter->state = DMXDEV_STATE_DONE;
 386         spin_unlock(&dmxdevfilter->dev->lock);
 387         wake_up(&dmxdevfilter->buffer.queue);
 388         return 0;
 389 }
 390
 391 static int dvb_dmxdev_ts_callback(const u8 *buffer1, size_t buffer1_len,
 392                                   const u8 *buffer2, size_t buffer2_len,
 393                                   struct dmx_ts_feed *feed,
 394                                   enum dmx_success success)
 395 {
 396         struct dmxdev_filter *dmxdevfilter = feed->priv;
 397         struct dvb_ringbuffer *buffer;
 398         int ret;
 399
 400         spin_lock(&dmxdevfilter->dev->lock);
 401         if (dmxdevfilter->params.pes.output == DMX_OUT_DECODER) {
 402                 spin_unlock(&dmxdevfilter->dev->lock);
 403                 return 0;
 404         }
 405
 406         if (dmxdevfilter->params.pes.output == DMX_OUT_TAP
 407             || dmxdevfilter->params.pes.output == DMX_OUT_TSDEMUX_TAP)
 408                 buffer = &dmxdevfilter->buffer;
 409         else
 410                 buffer = &dmxdevfilter->dev->dvr_buffer;
 411         if (buffer->error) {
 412                 spin_unlock(&dmxdevfilter->dev->lock);
 413                 wake_up(&buffer->queue);
 414                 return 0;
 415         }
 416         ret = dvb_dmxdev_buffer_write(buffer, buffer1, buffer1_len);
 417         if (ret == buffer1_len)
 418                 ret = dvb_dmxdev_buffer_write(buffer, buffer2, buffer2_len);
 419         if (ret < 0) {
 420                 dvb_ringbuffer_flush(buffer);
 421                 buffer->error = ret;
 422         }
 423         spin_unlock(&dmxdevfilter->dev->lock);
 424         wake_up(&buffer->queue);
 425         return 0;
 426 }
 427
 428 /* stop feed but only mark the specified filter as stopped (state set) */
 429 static int dvb_dmxdev_feed_stop(struct dmxdev_filter *dmxdevfilter)
 430 {
 431         struct dmxdev_feed *feed;
 432
 433         dvb_dmxdev_filter_state_set(dmxdevfilter, DMXDEV_STATE_SET);
 434
 435         switch (dmxdevfilter->type) {
 436         case DMXDEV_TYPE_SEC:
 437                 del_timer(&dmxdevfilter->timer);
 438                 dmxdevfilter->feed.sec->stop_filtering(dmxdevfilter->feed.sec);
 439                 break;
 440         case DMXDEV_TYPE_PES:
 441                 list_for_each_entry(feed, &dmxdevfilter->feed.ts, next)
 442                         feed->ts->stop_filtering(feed->ts);
 443                 break;
 444         default:
 445                 return -EINVAL;
 446         }
 447         return 0;
 448 }
 449
 450 /* start feed associated with the specified filter */
 451 static int dvb_dmxdev_feed_start(struct dmxdev_filter *filter)
 452 {
 453         struct dmxdev_feed *feed;
 454         int ret;
 455
 456         dvb_dmxdev_filter_state_set(filter, DMXDEV_STATE_GO);
 457
 458         switch (filter->type) {
 459         case DMXDEV_TYPE_SEC:
 460                 return filter->feed.sec->start_filtering(filter->feed.sec);
 461         case DMXDEV_TYPE_PES:
 462                 list_for_each_entry(feed, &filter->feed.ts, next) {
 463                         ret = feed->ts->start_filtering(feed->ts);
 464                         if (ret < 0) {
 465                                 dvb_dmxdev_feed_stop(filter);
 466                                 return ret;
 467                         }
 468                 }
 469                 break;
 470         default:
 471                 return -EINVAL;
 472         }
 473
 474         return 0;
 475 }
 476
 477 /* restart section feed if it has filters left associated with it,
 478    otherwise release the feed */
 479 static int dvb_dmxdev_feed_restart(struct dmxdev_filter *filter)
 480 {
 481         int i;
 482         struct dmxdev *dmxdev = filter->dev;
 483         u16 pid = filter->params.sec.pid;
 484
 485         for (i = 0; i < dmxdev->filternum; i++)
 486                 if (dmxdev->filter[i].state >= DMXDEV_STATE_GO &&
 487                     dmxdev->filter[i].type == DMXDEV_TYPE_SEC &&
 488                     dmxdev->filter[i].params.sec.pid == pid) {
 489                         dvb_dmxdev_feed_start(&dmxdev->filter[i]);
 490                         return 0;
 491                 }
 492
 493         filter->dev->demux->release_section_feed(dmxdev->demux,
 494                                                  filter->feed.sec);
 495
 496         return 0;
 497 }
 498
 499 static int dvb_dmxdev_filter_stop(struct dmxdev_filter *dmxdevfilter)
 500 {
 501         struct dmxdev_feed *feed;
 502         struct dmx_demux *demux;
 503
 504         if (dmxdevfilter->state < DMXDEV_STATE_GO)
 505                 return 0;
 506
 507         switch (dmxdevfilter->type) {
 508         case DMXDEV_TYPE_SEC:
 509                 if (!dmxdevfilter->feed.sec)
 510                         break;
 511                 dvb_dmxdev_feed_stop(dmxdevfilter);
 512                 if (dmxdevfilter->filter.sec)
 513                         dmxdevfilter->feed.sec->
 514                             release_filter(dmxdevfilter->feed.sec,
 515                                            dmxdevfilter->filter.sec);
 516                 dvb_dmxdev_feed_restart(dmxdevfilter);
 517                 dmxdevfilter->feed.sec = NULL;
 518                 break;
 519         case DMXDEV_TYPE_PES:
 520                 dvb_dmxdev_feed_stop(dmxdevfilter);
 521                 demux = dmxdevfilter->dev->demux;
 522                 list_for_each_entry(feed, &dmxdevfilter->feed.ts, next) {
 523                         demux->release_ts_feed(demux, feed->ts);
 524                         feed->ts = NULL;
 525                 }
 526                 break;
 527         default:
 528                 if (dmxdevfilter->state == DMXDEV_STATE_ALLOCATED)
 529                         return 0;
 530                 return -EINVAL;
 531         }
 532
 533         dvb_ringbuffer_flush(&dmxdevfilter->buffer);
 534         return 0;
 535 }
 536
 537 static void dvb_dmxdev_delete_pids(struct dmxdev_filter *dmxdevfilter)
 538 {
 539         struct dmxdev_feed *feed, *tmp;
 540
 541         /* delete all PIDs */
 542         list_for_each_entry_safe(feed, tmp, &dmxdevfilter->feed.ts, next) {
 543                 list_del(&feed->next);
 544                 kfree(feed);
 545         }
 546
 547         BUG_ON(!list_empty(&dmxdevfilter->feed.ts));
 548 }
 549
 550 static inline int dvb_dmxdev_filter_reset(struct dmxdev_filter *dmxdevfilter)
 551 {
 552         if (dmxdevfilter->state < DMXDEV_STATE_SET)
 553                 return 0;
 554
 555         if (dmxdevfilter->type == DMXDEV_TYPE_PES)
 556                 dvb_dmxdev_delete_pids(dmxdevfilter);
 557
 558         dmxdevfilter->type = DMXDEV_TYPE_NONE;
 559         dvb_dmxdev_filter_state_set(dmxdevfilter, DMXDEV_STATE_ALLOCATED);
 560         return 0;
 561 }
 562
 563 static int dvb_dmxdev_start_feed(struct dmxdev *dmxdev,
 564                                  struct dmxdev_filter *filter,
 565                                  struct dmxdev_feed *feed)
 566 {
 567         struct timespec timeout = { 0 };
 568         struct dmx_pes_filter_params *para = &filter->params.pes;
 569         dmx_output_t otype;
 570         int ret;
 571         int ts_type;
 572         dmx_pes_type_t ts_pes;
 573         struct dmx_ts_feed *tsfeed;
 574
 575         feed->ts = NULL;
 576         otype = para->output;
 577
 578         ts_pes = para->pes_type;
 579
 580         if (ts_pes < DMX_PES_OTHER)
 581                 ts_type = TS_DECODER;
 582         else
 583                 ts_type = 0;
 584
 585         if (otype == DMX_OUT_TS_TAP)
 586                 ts_type |= TS_PACKET;
 587         else if (otype == DMX_OUT_TSDEMUX_TAP)
 588                 ts_type |= TS_PACKET | TS_DEMUX;
 589         else if (otype == DMX_OUT_TAP)
 590                 ts_type |= TS_PACKET | TS_DEMUX | TS_PAYLOAD_ONLY;
 591
 592         ret = dmxdev->demux->allocate_ts_feed(dmxdev->demux, &feed->ts,
 593                                               dvb_dmxdev_ts_callback);
 594         if (ret < 0)
 595                 return ret;
 596
 597         tsfeed = feed->ts;
 598         tsfeed->priv = filter;
 599
 600         ret = tsfeed->set(tsfeed, feed->pid, ts_type, ts_pes, 32768, timeout);
 601         if (ret < 0) {
 602                 dmxdev->demux->release_ts_feed(dmxdev->demux, tsfeed);
 603                 return ret;
 604         }
 605
 606         ret = tsfeed->start_filtering(tsfeed);
 607         if (ret < 0) {
 608                 dmxdev->demux->release_ts_feed(dmxdev->demux, tsfeed);
 609                 return ret;
 610         }
 611
 612         return 0;
 613 }
 614
 615 static int dvb_dmxdev_filter_start(struct dmxdev_filter *filter)
 616 {
 617         struct dmxdev *dmxdev = filter->dev;
 618         struct dmxdev_feed *feed;
 619         void *mem;
 620         int ret, i;
 621
 622         if (filter->state < DMXDEV_STATE_SET)
 623                 return -EINVAL;
 624
 625         if (filter->state >= DMXDEV_STATE_GO)
 626                 dvb_dmxdev_filter_stop(filter);
 627
 628         if (!filter->buffer.data) {
 629                 mem = vmalloc(filter->buffer.size);
 630                 if (!mem)
 631                         return -ENOMEM;
 632                 spin_lock_irq(&filter->dev->lock);
 633                 filter->buffer.data = mem;
 634                 spin_unlock_irq(&filter->dev->lock);
 635         }
 636
 637         dvb_ringbuffer_flush(&filter->buffer);
 638
 639         switch (filter->type) {
 640         case DMXDEV_TYPE_SEC:
 641         {
 642                 struct dmx_sct_filter_params *para = &filter->params.sec;
 643                 struct dmx_section_filter **secfilter = &filter->filter.sec;
 644                 struct dmx_section_feed **secfeed = &filter->feed.sec;
 645
 646                 *secfilter = NULL;
 647                 *secfeed = NULL;
 648
 649
 650                 /* find active filter/feed with same PID */
 651                 for (i = 0; i < dmxdev->filternum; i++) {
 652                         if (dmxdev->filter[i].state >= DMXDEV_STATE_GO &&
 653                             dmxdev->filter[i].type == DMXDEV_TYPE_SEC &&
 654                             dmxdev->filter[i].params.sec.pid == para->pid) {
 655                                 *secfeed = dmxdev->filter[i].feed.sec;
 656                                 break;
 657                         }
 658                 }
 659
 660                 /* if no feed found, try to allocate new one */
 661                 if (!*secfeed) {
 662                         ret = dmxdev->demux->allocate_section_feed(dmxdev->demux,
 663                                                                    secfeed,
 664                                                                    dvb_dmxdev_section_callback);
 665                         if (ret < 0) {
 666                                 printk("DVB (%s): could not alloc feed\n",
 667                                        __func__);
 668                                 return ret;
 669                         }
 670
 671                         ret = (*secfeed)->set(*secfeed, para->pid, 32768,
 672                                               (para->flags & DMX_CHECK_CRC) ? 1 : 0);
 673                         if (ret < 0) {
 674                                 printk("DVB (%s): could not set feed\n",
 675                                        __func__);
 676                                 dvb_dmxdev_feed_restart(filter);
 677                                 return ret;
 678                         }
 679                 } else {
 680                         dvb_dmxdev_feed_stop(filter);
 681                 }
 682
 683                 ret = (*secfeed)->allocate_filter(*secfeed, secfilter);
 684                 if (ret < 0) {
 685                         dvb_dmxdev_feed_restart(filter);
 686                         filter->feed.sec->start_filtering(*secfeed);
 687                         dprintk("could not get filter\n");
 688                         return ret;
 689                 }
 690
 691                 (*secfilter)->priv = filter;
 692
 693                 memcpy(&((*secfilter)->filter_value[3]),
 694                        &(para->filter.filter[1]), DMX_FILTER_SIZE - 1);
 695                 memcpy(&(*secfilter)->filter_mask[3],
 696                        &para->filter.mask[1], DMX_FILTER_SIZE - 1);
 697                 memcpy(&(*secfilter)->filter_mode[3],
 698                        &para->filter.mode[1], DMX_FILTER_SIZE - 1);
 699
 700                 (*secfilter)->filter_value[0] = para->filter.filter[0];
 701                 (*secfilter)->filter_mask[0] = para->filter.mask[0];
 702                 (*secfilter)->filter_mode[0] = para->filter.mode[0];
 703                 (*secfilter)->filter_mask[1] = 0;
 704                 (*secfilter)->filter_mask[2] = 0;
 705
 706                 filter->todo = 0;
 707
 708                 ret = filter->feed.sec->start_filtering(filter->feed.sec);
 709                 if (ret < 0)
 710                         return ret;
 711
 712                 dvb_dmxdev_filter_timer(filter);
 713                 break;
 714         }
 715         case DMXDEV_TYPE_PES:
 716                 list_for_each_entry(feed, &filter->feed.ts, next) {
 717                         ret = dvb_dmxdev_start_feed(dmxdev, filter, feed);
 718                         if (ret < 0) {
 719                                 dvb_dmxdev_filter_stop(filter);
 720                                 return ret;
 721                         }
 722                 }
 723                 break;
 724         default:
 725                 return -EINVAL;
 726         }
 727
 728         dvb_dmxdev_filter_state_set(filter, DMXDEV_STATE_GO);
 729         return 0;
 730 }
 731
 732 static int dvb_demux_open(struct inode *inode, struct file *file)
 733 {
 734         struct dvb_device *dvbdev = file->private_data;
 735         struct dmxdev *dmxdev = dvbdev->priv;
 736         int i;
 737         struct dmxdev_filter *dmxdevfilter;
 738
 739         if (!dmxdev->filter)
 740                 return -EINVAL;
 741
 742         if (mutex_lock_interruptible(&dmxdev->mutex))
 743                 return -ERESTARTSYS;
 744
 745         for (i = 0; i < dmxdev->filternum; i++)
 746                 if (dmxdev->filter[i].state == DMXDEV_STATE_FREE)
 747                         break;
 748
 749         if (i == dmxdev->filternum) {
 750                 mutex_unlock(&dmxdev->mutex);
 751                 return -EMFILE;
 752         }
 753
 754         dmxdevfilter = &dmxdev->filter[i];
 755         mutex_init(&dmxdevfilter->mutex);
 756         file->private_data = dmxdevfilter;
 757
 758         dvb_ringbuffer_init(&dmxdevfilter->buffer, NULL, 8192);
 759         dmxdevfilter->type = DMXDEV_TYPE_NONE;
 760         dvb_dmxdev_filter_state_set(dmxdevfilter, DMXDEV_STATE_ALLOCATED);
 761         init_timer(&dmxdevfilter->timer);
 762
 763         dvbdev->users++;
 764
 765         mutex_unlock(&dmxdev->mutex);
 766         return 0;
 767 }
 768
 769 static int dvb_dmxdev_filter_free(struct dmxdev *dmxdev,
 770                                   struct dmxdev_filter *dmxdevfilter)
 771 {
 772         mutex_lock(&dmxdev->mutex);
 773         mutex_lock(&dmxdevfilter->mutex);
 774
 775         dvb_dmxdev_filter_stop(dmxdevfilter);
 776         dvb_dmxdev_filter_reset(dmxdevfilter);
 777
 778         if (dmxdevfilter->buffer.data) {
 779                 void *mem = dmxdevfilter->buffer.data;
 780
 781                 spin_lock_irq(&dmxdev->lock);
 782                 dmxdevfilter->buffer.data = NULL;
 783                 spin_unlock_irq(&dmxdev->lock);
 784                 vfree(mem);
 785         }
 786
 787         dvb_dmxdev_filter_state_set(dmxdevfilter, DMXDEV_STATE_FREE);
 788         wake_up(&dmxdevfilter->buffer.queue);
 789         mutex_unlock(&dmxdevfilter->mutex);
 790         mutex_unlock(&dmxdev->mutex);
 791         return 0;
 792 }
 793
 794 static inline void invert_mode(dmx_filter_t *filter)
 795 {
 796         int i;
 797
 798         for (i = 0; i < DMX_FILTER_SIZE; i++)
 799                 filter->mode[i] ^= 0xff;
 800 }
 801
 802 static int dvb_dmxdev_add_pid(struct dmxdev *dmxdev,
 803                               struct dmxdev_filter *filter, u16 pid)
 804 {
 805         struct dmxdev_feed *feed;
 806
 807         if ((filter->type != DMXDEV_TYPE_PES) ||
 808             (filter->state < DMXDEV_STATE_SET))
 809                 return -EINVAL;
 810
 811         /* only TS packet filters may have multiple PIDs */
 812         if ((filter->params.pes.output != DMX_OUT_TSDEMUX_TAP) &&
 813             (!list_empty(&filter->feed.ts)))
 814                 return -EINVAL;
 815
 816         feed = kzalloc(sizeof(struct dmxdev_feed), GFP_KERNEL);
 817         if (feed == NULL)
 818                 return -ENOMEM;
 819
 820         feed->pid = pid;
 821         list_add(&feed->next, &filter->feed.ts);
 822
 823         if (filter->state >= DMXDEV_STATE_GO)
 824                 return dvb_dmxdev_start_feed(dmxdev, filter, feed);
 825
 826         return 0;
 827 }
 828
 829 static int dvb_dmxdev_remove_pid(struct dmxdev *dmxdev,
 830                                   struct dmxdev_filter *filter, u16 pid)
 831 {
 832         struct dmxdev_feed *feed, *tmp;
 833
 834         if ((filter->type != DMXDEV_TYPE_PES) ||
 835             (filter->state < DMXDEV_STATE_SET))
 836                 return -EINVAL;
 837
 838         list_for_each_entry_safe(feed, tmp, &filter->feed.ts, next) {
 839                 if ((feed->pid == pid) && (feed->ts != NULL)) {
 840                         feed->ts->stop_filtering(feed->ts);
 841                         filter->dev->demux->release_ts_feed(filter->dev->demux,
 842                                                             feed->ts);
 843                         list_del(&feed->next);
 844                         kfree(feed);
 845                 }
 846         }
 847
 848         return 0;
 849 }
 850
 851 static int dvb_dmxdev_filter_set(struct dmxdev *dmxdev,
 852                                  struct dmxdev_filter *dmxdevfilter,
 853                                  struct dmx_sct_filter_params *params)
 854 {
 855         dprintk("function : %s\n", __func__);
 856
 857         dvb_dmxdev_filter_stop(dmxdevfilter);
 858
 859         dmxdevfilter->type = DMXDEV_TYPE_SEC;
 860         memcpy(&dmxdevfilter->params.sec,
 861                params, sizeof(struct dmx_sct_filter_params));
 862         invert_mode(&dmxdevfilter->params.sec.filter);
 863         dvb_dmxdev_filter_state_set(dmxdevfilter, DMXDEV_STATE_SET);
 864
 865         if (params->flags & DMX_IMMEDIATE_START)
 866                 return dvb_dmxdev_filter_start(dmxdevfilter);
 867
 868         return 0;
 869 }
 870
 871 static int dvb_dmxdev_pes_filter_set(struct dmxdev *dmxdev,
 872                                      struct dmxdev_filter *dmxdevfilter,
 873                                      struct dmx_pes_filter_params *params)
 874 {
 875         int ret;
 876
 877         dvb_dmxdev_filter_stop(dmxdevfilter);
 878         dvb_dmxdev_filter_reset(dmxdevfilter);
 879
 880         if (params->pes_type > DMX_PES_OTHER || params->pes_type < 0)
 881                 return -EINVAL;
 882
 883         dmxdevfilter->type = DMXDEV_TYPE_PES;
 884         memcpy(&dmxdevfilter->params, params,
 885                sizeof(struct dmx_pes_filter_params));
 886         INIT_LIST_HEAD(&dmxdevfilter->feed.ts);
 887
 888         dvb_dmxdev_filter_state_set(dmxdevfilter, DMXDEV_STATE_SET);
 889
 890         ret = dvb_dmxdev_add_pid(dmxdev, dmxdevfilter,
 891                                  dmxdevfilter->params.pes.pid);
 892         if (ret < 0)
 893                 return ret;
 894
 895         if (params->flags & DMX_IMMEDIATE_START)
 896                 return dvb_dmxdev_filter_start(dmxdevfilter);
 897
 898         return 0;
 899 }
 900
 901 static ssize_t dvb_dmxdev_read_sec(struct dmxdev_filter *dfil,
 902                                    struct file *file, char __user *buf,
 903                                    size_t count, loff_t *ppos)
 904 {
 905         int result, hcount;
 906         int done = 0;
 907
 908         if (dfil->todo <= 0) {
 909                 hcount = 3 + dfil->todo;
 910                 if (hcount > count)
 911                         hcount = count;
 912                 result = dvb_dmxdev_buffer_read(&dfil->buffer,
 913                                                 file->f_flags & O_NONBLOCK,
 914                                                 buf, hcount, ppos);
 915                 if (result < 0) {
 916                         dfil->todo = 0;
 917                         return result;
 918                 }
 919                 if (copy_from_user(dfil->secheader - dfil->todo, buf, result))
 920                         return -EFAULT;
 921                 buf += result;
 922                 done = result;
 923                 count -= result;
 924                 dfil->todo -= result;
 925                 if (dfil->todo > -3)
 926                         return done;
 927                 dfil->todo = ((dfil->secheader[1] << 8) | dfil->secheader[2]) & 0xfff;
 928                 if (!count)
 929                         return done;
 930         }
 931         if (count > dfil->todo)
 932                 count = dfil->todo;
 933         result = dvb_dmxdev_buffer_read(&dfil->buffer,
 934                                         file->f_flags & O_NONBLOCK,
 935                                         buf, count, ppos);
 936         if (result < 0)
 937                 return result;
 938         dfil->todo -= result;
 939         return (result + done);
 940 }
 941
 942 static ssize_t
 943 dvb_demux_read(struct file *file, char __user *buf, size_t count,
 944                loff_t *ppos)
 945 {
 946         struct dmxdev_filter *dmxdevfilter = file->private_data;
 947         int ret;
 948
 949         if (mutex_lock_interruptible(&dmxdevfilter->mutex))
 950                 return -ERESTARTSYS;
 951
 952         if (dmxdevfilter->type == DMXDEV_TYPE_SEC)
 953                 ret = dvb_dmxdev_read_sec(dmxdevfilter, file, buf, count, ppos);
 954         else
 955                 ret = dvb_dmxdev_buffer_read(&dmxdevfilter->buffer,
 956                                              file->f_flags & O_NONBLOCK,
 957                                              buf, count, ppos);
 958
 959         mutex_unlock(&dmxdevfilter->mutex);
 960         return ret;
 961 }
 962
 963 static int dvb_demux_do_ioctl(struct file *file,
 964                               unsigned int cmd, void *parg)
 965 {
 966         struct dmxdev_filter *dmxdevfilter = file->private_data;
 967         struct dmxdev *dmxdev = dmxdevfilter->dev;
 968         unsigned long arg = (unsigned long)parg;
 969         int ret = 0;
 970
 971         if (mutex_lock_interruptible(&dmxdev->mutex))
 972                 return -ERESTARTSYS;
 973
 974         switch (cmd) {
 975         case DMX_START:
 976                 if (mutex_lock_interruptible(&dmxdevfilter->mutex)) {
 977                         mutex_unlock(&dmxdev->mutex);
 978                         return -ERESTARTSYS;
 979                 }
 980                 if (dmxdevfilter->state < DMXDEV_STATE_SET)
 981                         ret = -EINVAL;
 982                 else
 983                         ret = dvb_dmxdev_filter_start(dmxdevfilter);
 984                 mutex_unlock(&dmxdevfilter->mutex);
 985                 break;
 986
 987         case DMX_STOP:
 988                 if (mutex_lock_interruptible(&dmxdevfilter->mutex)) {
 989                         mutex_unlock(&dmxdev->mutex);
 990                         return -ERESTARTSYS;
 991                 }
 992                 ret = dvb_dmxdev_filter_stop(dmxdevfilter);
 993                 mutex_unlock(&dmxdevfilter->mutex);
 994                 break;
 995
 996         case DMX_SET_FILTER:
 997                 if (mutex_lock_interruptible(&dmxdevfilter->mutex)) {
 998                         mutex_unlock(&dmxdev->mutex);
 999                         return -ERESTARTSYS;
1000                 }
1001                 ret = dvb_dmxdev_filter_set(dmxdev, dmxdevfilter, parg);
1002                 mutex_unlock(&dmxdevfilter->mutex);
1003                 break;
1004
1005         case DMX_SET_PES_FILTER:
1006                 if (mutex_lock_interruptible(&dmxdevfilter->mutex)) {
1007                         mutex_unlock(&dmxdev->mutex);
1008                         return -ERESTARTSYS;
1009                 }
1010                 ret = dvb_dmxdev_pes_filter_set(dmxdev, dmxdevfilter, parg);
1011                 mutex_unlock(&dmxdevfilter->mutex);
1012                 break;
1013
1014         case DMX_SET_BUFFER_SIZE:
1015                 if (mutex_lock_interruptible(&dmxdevfilter->mutex)) {
1016                         mutex_unlock(&dmxdev->mutex);
1017                         return -ERESTARTSYS;
1018                 }
1019                 ret = dvb_dmxdev_set_buffer_size(dmxdevfilter, arg);
1020                 mutex_unlock(&dmxdevfilter->mutex);
1021                 break;
1022
1023         case DMX_GET_PES_PIDS:
1024                 if (!dmxdev->demux->get_pes_pids) {
1025                         ret = -EINVAL;
1026                         break;
1027                 }
1028                 dmxdev->demux->get_pes_pids(dmxdev->demux, parg);
1029                 break;
1030
1031         case DMX_GET_CAPS:
1032                 if (!dmxdev->demux->get_caps) {
1033                         ret = -EINVAL;
1034                         break;
1035                 }
1036                 ret = dmxdev->demux->get_caps(dmxdev->demux, parg);
1037                 break;
1038
1039         case DMX_SET_SOURCE:
1040                 if (!dmxdev->demux->set_source) {
1041                         ret = -EINVAL;
1042                         break;
1043                 }
1044                 ret = dmxdev->demux->set_source(dmxdev->demux, parg);
1045                 break;
1046
1047         case DMX_GET_STC:
1048                 if (!dmxdev->demux->get_stc) {
1049                         ret = -EINVAL;
1050                         break;
1051                 }
1052                 ret = dmxdev->demux->get_stc(dmxdev->demux,
1053                                              ((struct dmx_stc *)parg)->num,
1054                                              &((struct dmx_stc *)parg)->stc,
1055                                              &((struct dmx_stc *)parg)->base);
1056                 break;
1057
1058         case DMX_ADD_PID:
1059                 if (mutex_lock_interruptible(&dmxdevfilter->mutex)) {
1060                         ret = -ERESTARTSYS;
1061                         break;
1062                 }
1063                 ret = dvb_dmxdev_add_pid(dmxdev, dmxdevfilter, *(u16 *)parg);
1064                 mutex_unlock(&dmxdevfilter->mutex);
1065                 break;
1066
1067         case DMX_REMOVE_PID:
1068                 if (mutex_lock_interruptible(&dmxdevfilter->mutex)) {
1069                         ret = -ERESTARTSYS;
1070                         break;
1071                 }
1072                 ret = dvb_dmxdev_remove_pid(dmxdev, dmxdevfilter, *(u16 *)parg);
1073                 mutex_unlock(&dmxdevfilter->mutex);
1074                 break;
1075
1076         default:
1077                 ret = -EINVAL;
1078                 break;
1079         }
1080         mutex_unlock(&dmxdev->mutex);
1081         return ret;
1082 }
1083
1084 static long dvb_demux_ioctl(struct file *file, unsigned int cmd,
1085                             unsigned long arg)
1086 {
1087         return dvb_usercopy(file, cmd, arg, dvb_demux_do_ioctl);
1088 }
1089
1090 static unsigned int dvb_demux_poll(struct file *file, poll_table *wait)
1091 {
1092         struct dmxdev_filter *dmxdevfilter = file->private_data;
1093         unsigned int mask = 0;
1094
1095         if (!dmxdevfilter)
1096                 return -EINVAL;
1097
1098         poll_wait(file, &dmxdevfilter->buffer.queue, wait);
1099
1100         if (dmxdevfilter->state != DMXDEV_STATE_GO &&
1101             dmxdevfilter->state != DMXDEV_STATE_DONE &&
1102             dmxdevfilter->state != DMXDEV_STATE_TIMEDOUT)
1103                 return 0;
1104
1105         if (dmxdevfilter->buffer.error)
1106                 mask |= (POLLIN | POLLRDNORM | POLLPRI | POLLERR);
1107
1108         if (!dvb_ringbuffer_empty(&dmxdevfilter->buffer))
1109                 mask |= (POLLIN | POLLRDNORM | POLLPRI);
1110
1111         return mask;
1112 }
1113
1114 static int dvb_demux_release(struct inode *inode, struct file *file)
1115 {
1116         struct dmxdev_filter *dmxdevfilter = file->private_data;
1117         struct dmxdev *dmxdev = dmxdevfilter->dev;
1118
1119         int ret;
1120
1121         ret = dvb_dmxdev_filter_free(dmxdev, dmxdevfilter);
1122
1123         mutex_lock(&dmxdev->mutex);
1124         dmxdev->dvbdev->users--;
1125         if(dmxdev->dvbdev->users==1 && dmxdev->exit==1) {
1126                 fops_put(file->f_op);
1127                 file->f_op = NULL;
1128                 mutex_unlock(&dmxdev->mutex);
1129                 wake_up(&dmxdev->dvbdev->wait_queue);
1130         } else
1131                 mutex_unlock(&dmxdev->mutex);
1132
1133         return ret;
1134 }
1135
1136 static const struct file_operations dvb_demux_fops = {
1137         .owner = THIS_MODULE,
1138         .read = dvb_demux_read,
1139         .unlocked_ioctl = dvb_demux_ioctl,
1140         .open = dvb_demux_open,
1141         .release = dvb_demux_release,
1142         .poll = dvb_demux_poll,
1143         .llseek = default_llseek,
1144 };
1145
1146 static struct dvb_device dvbdev_demux = {
1147         .priv = NULL,
1148         .users = 1,
1149         .writers = 1,
1150         .fops = &dvb_demux_fops
1151 };
1152
1153 static int dvb_dvr_do_ioctl(struct file *file,
1154                             unsigned int cmd, void *parg)
1155 {
1156         struct dvb_device *dvbdev = file->private_data;
1157         struct dmxdev *dmxdev = dvbdev->priv;
1158         unsigned long arg = (unsigned long)parg;
1159         int ret;
1160
1161         if (mutex_lock_interruptible(&dmxdev->mutex))
1162                 return -ERESTARTSYS;
1163
1164         switch (cmd) {
1165         case DMX_SET_BUFFER_SIZE:
1166                 ret = dvb_dvr_set_buffer_size(dmxdev, arg);
1167                 break;
1168
1169         default:
1170                 ret = -EINVAL;
1171                 break;
1172         }
1173         mutex_unlock(&dmxdev->mutex);
1174         return ret;
1175 }
1176
1177 static long dvb_dvr_ioctl(struct file *file,
1178                          unsigned int cmd, unsigned long arg)
1179 {
1180         return dvb_usercopy(file, cmd, arg, dvb_dvr_do_ioctl);
1181 }
1182
1183 static unsigned int dvb_dvr_poll(struct file *file, poll_table *wait)
1184 {
1185         struct dvb_device *dvbdev = file->private_data;
1186         struct dmxdev *dmxdev = dvbdev->priv;
1187         unsigned int mask = 0;
1188
1189         dprintk("function : %s\n", __func__);
1190
1191         poll_wait(file, &dmxdev->dvr_buffer.queue, wait);
1192
1193         if ((file->f_flags & O_ACCMODE) == O_RDONLY) {
1194                 if (dmxdev->dvr_buffer.error)
1195                         mask |= (POLLIN | POLLRDNORM | POLLPRI | POLLERR);
1196
1197                 if (!dvb_ringbuffer_empty(&dmxdev->dvr_buffer))
1198                         mask |= (POLLIN | POLLRDNORM | POLLPRI);
1199         } else
1200                 mask |= (POLLOUT | POLLWRNORM | POLLPRI);
1201
1202         return mask;
1203 }
1204
1205 static const struct file_operations dvb_dvr_fops = {
1206         .owner = THIS_MODULE,
1207         .read = dvb_dvr_read,
1208         .write = dvb_dvr_write,
1209         .unlocked_ioctl = dvb_dvr_ioctl,
1210         .open = dvb_dvr_open,
1211         .release = dvb_dvr_release,
1212         .poll = dvb_dvr_poll,
1213         .llseek = default_llseek,
1214 };
1215
1216 static struct dvb_device dvbdev_dvr = {
1217         .priv = NULL,
1218         .readers = 1,
1219         .users = 1,
1220         .fops = &dvb_dvr_fops
1221 };
1222
1223 int dvb_dmxdev_init(struct dmxdev *dmxdev, struct dvb_adapter *dvb_adapter)
1224 {
1225         int i;
1226
1227         if (dmxdev->demux->open(dmxdev->demux) < 0)
1228                 return -EUSERS;
1229
1230         dmxdev->filter = vmalloc(dmxdev->filternum * sizeof(struct dmxdev_filter));
1231         if (!dmxdev->filter)
1232                 return -ENOMEM;
1233
1234         mutex_init(&dmxdev->mutex);
1235         spin_lock_init(&dmxdev->lock);
1236         for (i = 0; i < dmxdev->filternum; i++) {
1237                 dmxdev->filter[i].dev = dmxdev;
1238                 dmxdev->filter[i].buffer.data = NULL;
1239                 dvb_dmxdev_filter_state_set(&dmxdev->filter[i],
1240                                             DMXDEV_STATE_FREE);
1241         }
1242
1243         dvb_register_device(dvb_adapter, &dmxdev->dvbdev, &dvbdev_demux, dmxdev,
1244                             DVB_DEVICE_DEMUX);
1245         dvb_register_device(dvb_adapter, &dmxdev->dvr_dvbdev, &dvbdev_dvr,
1246                             dmxdev, DVB_DEVICE_DVR);
1247
1248         dvb_ringbuffer_init(&dmxdev->dvr_buffer, NULL, 8192);
1249
1250         return 0;
1251 }
1252
1253 EXPORT_SYMBOL(dvb_dmxdev_init);
1254
1255 void dvb_dmxdev_release(struct dmxdev *dmxdev)
1256 {
1257         dmxdev->exit=1;
1258         if (dmxdev->dvbdev->users > 1) {
1259                 wait_event(dmxdev->dvbdev->wait_queue,
1260                                 dmxdev->dvbdev->users==1);
1261         }
1262         if (dmxdev->dvr_dvbdev->users > 1) {
1263                 wait_event(dmxdev->dvr_dvbdev->wait_queue,
1264                                 dmxdev->dvr_dvbdev->users==1);
1265         }
1266
1267         dvb_unregister_device(dmxdev->dvbdev);
1268         dvb_unregister_device(dmxdev->dvr_dvbdev);
1269
1270         vfree(dmxdev->filter);
1271         dmxdev->filter = NULL;
1272         dmxdev->demux->close(dmxdev->demux);
1273 }
1274
1275 EXPORT_SYMBOL(dvb_dmxdev_release);