drivers/media/dvb/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/smp_lock.h>
  29 #include <linux/poll.h>
  30 #include <linux/ioctl.h>
  31 #include <linux/wait.h>
  32 #include <asm/uaccess.h>
  33 #include <asm/system.h>
  34 #include "dmxdev.h"
  35
  36 static int debug;
  37
  38 module_param(debug, int, 0644);
  39 MODULE_PARM_DESC(debug, "Turn on/off debugging (default:off).");
  40
  41 #define dprintk if (debug) printk
  42
  43 static int dvb_dmxdev_buffer_write(struct dvb_ringbuffer *buf,
  44                                    const u8 *src, size_t len)
  45 {
  46         ssize_t free;
  47
  48         if (!len)
  49                 return 0;
  50         if (!buf->data)
  51                 return 0;
  52
  53         free = dvb_ringbuffer_free(buf);
  54         if (len > free) {
  55                 dprintk("dmxdev: buffer overflow\n");
  56                 return -EOVERFLOW;
  57         }
  58
  59         return dvb_ringbuffer_write(buf, src, len);
  60 }
  61
  62 static ssize_t dvb_dmxdev_buffer_read(struct dvb_ringbuffer *src,
  63                                       int non_blocking, char __user *buf,
  64                                       size_t count, loff_t *ppos)
  65 {
  66         size_t todo;
  67         ssize_t avail;
  68         ssize_t ret = 0;
  69
  70         if (!src->data)
  71                 return 0;
  72
  73         if (src->error) {
  74                 ret = src->error;
  75                 dvb_ringbuffer_flush(src);
  76                 return ret;
  77         }
  78
  79         for (todo = count; todo > 0; todo -= ret) {
  80                 if (non_blocking && dvb_ringbuffer_empty(src)) {
  81                         ret = -EWOULDBLOCK;
  82                         break;
  83                 }
  84
  85                 ret = wait_event_interruptible(src->queue,
  86                                                !dvb_ringbuffer_empty(src) ||
  87                                                (src->error != 0));
  88                 if (ret < 0)
  89                         break;
  90
  91                 if (src->error) {
  92                         ret = src->error;
  93                         dvb_ringbuffer_flush(src);
  94                         break;
  95                 }
  96
  97                 avail = dvb_ringbuffer_avail(src);
  98                 if (avail > todo)
  99                         avail = todo;
 100
 101                 ret = dvb_ringbuffer_read_user(src, buf, avail);
 102                 if (ret < 0)
 103                         break;
 104
 105                 buf += ret;
 106         }
 107
 108         return (count - todo) ? (count - todo) : ret;
 109 }
 110
 111 static struct dmx_frontend *get_fe(struct dmx_demux *demux, int type)
 112 {
 113         struct list_head *head, *pos;
 114
 115         head = demux->get_frontends(demux);
 116         if (!head)
 117                 return NULL;
 118         list_for_each(pos, head)
 119                 if (DMX_FE_ENTRY(pos)->source == type)
 120                         return DMX_FE_ENTRY(pos);
 121
 122         return NULL;
 123 }
 124
 125 static int dvb_dvr_open(struct inode *inode, struct file *file)
 126 {
 127         struct dvb_device *dvbdev = file->private_data;
 128         struct dmxdev *dmxdev = dvbdev->priv;
 129         struct dmx_frontend *front;
 130
 131         dprintk("function : %s\n", __func__);
 132
 133         if (mutex_lock_interruptible(&dmxdev->mutex))
 134                 return -ERESTARTSYS;
 135
 136         if (dmxdev->exit) {
 137                 mutex_unlock(&dmxdev->mutex);
 138                 return -ENODEV;
 139         }
 140
 141         if ((file->f_flags & O_ACCMODE) == O_RDWR) {
 142                 if (!(dmxdev->capabilities & DMXDEV_CAP_DUPLEX)) {
 143                         mutex_unlock(&dmxdev->mutex);
 144                         return -EOPNOTSUPP;
 145                 }
 146         }
 147
 148         if ((file->f_flags & O_ACCMODE) == O_RDONLY) {
 149                 void *mem;
 150                 if (!dvbdev->readers) {
 151                         mutex_unlock(&dmxdev->mutex);
 152                         return -EBUSY;
 153                 }
 154                 mem = vmalloc(DVR_BUFFER_SIZE);
 155                 if (!mem) {
 156                         mutex_unlock(&dmxdev->mutex);
 157                         return -ENOMEM;
 158                 }
 159                 dvb_ringbuffer_init(&dmxdev->dvr_buffer, mem, DVR_BUFFER_SIZE);
 160                 dvbdev->readers--;
 161         }
 162
 163         if ((file->f_flags & O_ACCMODE) == O_WRONLY) {
 164                 dmxdev->dvr_orig_fe = dmxdev->demux->frontend;
 165
 166                 if (!dmxdev->demux->write) {
 167                         mutex_unlock(&dmxdev->mutex);
 168                         return -EOPNOTSUPP;
 169                 }
 170
 171                 front = get_fe(dmxdev->demux, DMX_MEMORY_FE);
 172
 173                 if (!front) {
 174                         mutex_unlock(&dmxdev->mutex);
 175                         return -EINVAL;
 176                 }
 177                 dmxdev->demux->disconnect_frontend(dmxdev->demux);
 178                 dmxdev->demux->connect_frontend(dmxdev->demux, front);
 179         }
 180         dvbdev->users++;
 181         mutex_unlock(&dmxdev->mutex);
 182         return 0;
 183 }
 184
 185 static int dvb_dvr_release(struct inode *inode, struct file *file)
 186 {
 187         struct dvb_device *dvbdev = file->private_data;
 188         struct dmxdev *dmxdev = dvbdev->priv;
 189
 190         mutex_lock(&dmxdev->mutex);
 191
 192         if ((file->f_flags & O_ACCMODE) == O_WRONLY) {
 193                 dmxdev->demux->disconnect_frontend(dmxdev->demux);
 194                 dmxdev->demux->connect_frontend(dmxdev->demux,
 195                                                 dmxdev->dvr_orig_fe);
 196         }
 197         if ((file->f_flags & O_ACCMODE) == O_RDONLY) {
 198                 dvbdev->readers++;
 199                 if (dmxdev->dvr_buffer.data) {
 200                         void *mem = dmxdev->dvr_buffer.data;
 201                         mb();
 202                         spin_lock_irq(&dmxdev->lock);
 203                         dmxdev->dvr_buffer.data = NULL;
 204                         spin_unlock_irq(&dmxdev->lock);
 205                         vfree(mem);
 206                 }
 207         }
 208         /* TODO */
 209         dvbdev->users--;
 210         if(dvbdev->users==-1 && dmxdev->exit==1) {
 211                 fops_put(file->f_op);
 212                 file->f_op = NULL;
 213                 mutex_unlock(&dmxdev->mutex);
 214                 wake_up(&dvbdev->wait_queue);
 215         } else
 216                 mutex_unlock(&dmxdev->mutex);
 217
 218         return 0;
 219 }
 220
 221 static ssize_t dvb_dvr_write(struct file *file, const char __user *buf,
 222                              size_t count, loff_t *ppos)
 223 {
 224         struct dvb_device *dvbdev = file->private_data;
 225         struct dmxdev *dmxdev = dvbdev->priv;
 226         int ret;
 227
 228         if (!dmxdev->demux->write)
 229                 return -EOPNOTSUPP;
 230         if ((file->f_flags & O_ACCMODE) != O_WRONLY)
 231                 return -EINVAL;
 232         if (mutex_lock_interruptible(&dmxdev->mutex))
 233                 return -ERESTARTSYS;
 234
 235         if (dmxdev->exit) {
 236                 mutex_unlock(&dmxdev->mutex);
 237                 return -ENODEV;
 238         }
 239         ret = dmxdev->demux->write(dmxdev->demux, buf, count);
 240         mutex_unlock(&dmxdev->mutex);
 241         return ret;
 242 }
 243
 244 static ssize_t dvb_dvr_read(struct file *file, char __user *buf, size_t count,
 245                             loff_t *ppos)
 246 {
 247         struct dvb_device *dvbdev = file->private_data;
 248         struct dmxdev *dmxdev = dvbdev->priv;
 249
 250         if (dmxdev->exit)
 251                 return -ENODEV;
 252
 253         return dvb_dmxdev_buffer_read(&dmxdev->dvr_buffer,
 254                                       file->f_flags & O_NONBLOCK,
 255                                       buf, count, ppos);
 256 }
 257
 258 static int dvb_dvr_set_buffer_size(struct dmxdev *dmxdev,
 259                                       unsigned long size)
 260 {
 261         struct dvb_ringbuffer *buf = &dmxdev->dvr_buffer;
 262         void *newmem;
 263         void *oldmem;
 264
 265         dprintk("function : %s\n", __func__);
 266
 267         if (buf->size == size)
 268                 return 0;
 269         if (!size)
 270                 return -EINVAL;
 271
 272         newmem = vmalloc(size);
 273         if (!newmem)
 274                 return -ENOMEM;
 275
 276         oldmem = buf->data;
 277
 278         spin_lock_irq(&dmxdev->lock);
 279         buf->data = newmem;
 280         buf->size = size;
 281
 282         /* reset and not flush in case the buffer shrinks */
 283         dvb_ringbuffer_reset(buf);
 284         spin_unlock_irq(&dmxdev->lock);
 285
 286         vfree(oldmem);
 287
 288         return 0;
 289 }
 290
 291 static inline void dvb_dmxdev_filter_state_set(struct dmxdev_filter
 292                                                *dmxdevfilter, int state)
 293 {
 294         spin_lock_irq(&dmxdevfilter->dev->lock);
 295         dmxdevfilter->state = state;
 296         spin_unlock_irq(&dmxdevfilter->dev->lock);
 297 }
 298
 299 static int dvb_dmxdev_set_buffer_size(struct dmxdev_filter *dmxdevfilter,
 300                                       unsigned long size)
 301 {
 302         struct dvb_ringbuffer *buf = &dmxdevfilter->buffer;
 303         void *newmem;
 304         void *oldmem;
 305
 306         if (buf->size == size)
 307                 return 0;
 308         if (!size)
 309                 return -EINVAL;
 310         if (dmxdevfilter->state >= DMXDEV_STATE_GO)
 311                 return -EBUSY;
 312
 313         newmem = vmalloc(size);
 314         if (!newmem)
 315                 return -ENOMEM;
 316
 317         oldmem = buf->data;
 318
 319         spin_lock_irq(&dmxdevfilter->dev->lock);
 320         buf->data = newmem;
 321         buf->size = size;
 322
 323         /* reset and not flush in case the buffer shrinks */
 324         dvb_ringbuffer_reset(buf);
 325         spin_unlock_irq(&dmxdevfilter->dev->lock);
 326
 327         vfree(oldmem);
 328
 329         return 0;
 330 }
 331
 332 static void dvb_dmxdev_filter_timeout(unsigned long data)
 333 {
 334         struct dmxdev_filter *dmxdevfilter = (struct dmxdev_filter *)data;
 335
 336         dmxdevfilter->buffer.error = -ETIMEDOUT;
 337         spin_lock_irq(&dmxdevfilter->dev->lock);
 338         dmxdevfilter->state = DMXDEV_STATE_TIMEDOUT;
 339         spin_unlock_irq(&dmxdevfilter->dev->lock);
 340         wake_up(&dmxdevfilter->buffer.queue);
 341 }
 342
 343 static void dvb_dmxdev_filter_timer(struct dmxdev_filter *dmxdevfilter)
 344 {
 345         struct dmx_sct_filter_params *para = &dmxdevfilter->params.sec;
 346
 347         del_timer(&dmxdevfilter->timer);
 348         if (para->timeout) {
 349                 dmxdevfilter->timer.function = dvb_dmxdev_filter_timeout;
 350                 dmxdevfilter->timer.data = (unsigned long)dmxdevfilter;
 351                 dmxdevfilter->timer.expires =
 352                     jiffies + 1 + (HZ / 2 + HZ * para->timeout) / 1000;
 353                 add_timer(&dmxdevfilter->timer);
 354         }
 355 }
 356
 357 static int dvb_dmxdev_section_callback(const u8 *buffer1, size_t buffer1_len,
 358                                        const u8 *buffer2, size_t buffer2_len,
 359                                        struct dmx_section_filter *filter,
 360                                        enum dmx_success success)
 361 {
 362         struct dmxdev_filter *dmxdevfilter = filter->priv;
 363         int ret;
 364
 365         if (dmxdevfilter->buffer.error) {
 366                 wake_up(&dmxdevfilter->buffer.queue);
 367                 return 0;
 368         }
 369         spin_lock(&dmxdevfilter->dev->lock);
 370         if (dmxdevfilter->state != DMXDEV_STATE_GO) {
 371                 spin_unlock(&dmxdevfilter->dev->lock);
 372                 return 0;
 373         }
 374         del_timer(&dmxdevfilter->timer);
 375         dprintk("dmxdev: section callback %02x %02x %02x %02x %02x %02x\n",
 376                 buffer1[0], buffer1[1],
 377                 buffer1[2], buffer1[3], buffer1[4], buffer1[5]);
 378         ret = dvb_dmxdev_buffer_write(&dmxdevfilter->buffer, buffer1,
 379                                       buffer1_len);
 380         if (ret == buffer1_len) {
 381                 ret = dvb_dmxdev_buffer_write(&dmxdevfilter->buffer, buffer2,
 382                                               buffer2_len);
 383         }
 384         if (ret < 0) {
 385                 dvb_ringbuffer_flush(&dmxdevfilter->buffer);
 386                 dmxdevfilter->buffer.error = ret;
 387         }
 388         if (dmxdevfilter->params.sec.flags & DMX_ONESHOT)
 389                 dmxdevfilter->state = DMXDEV_STATE_DONE;
 390         spin_unlock(&dmxdevfilter->dev->lock);
 391         wake_up(&dmxdevfilter->buffer.queue);
 392         return 0;
 393 }
 394
 395 static int dvb_dmxdev_ts_callback(const u8 *buffer1, size_t buffer1_len,
 396                                   const u8 *buffer2, size_t buffer2_len,
 397                                   struct dmx_ts_feed *feed,
 398                                   enum dmx_success success)
 399 {
 400         struct dmxdev_filter *dmxdevfilter = feed->priv;
 401         struct dvb_ringbuffer *buffer;
 402         int ret;
 403
 404         spin_lock(&dmxdevfilter->dev->lock);
 405         if (dmxdevfilter->params.pes.output == DMX_OUT_DECODER) {
 406                 spin_unlock(&dmxdevfilter->dev->lock);
 407                 return 0;
 408         }
 409
 410         if (dmxdevfilter->params.pes.output == DMX_OUT_TAP
 411             || dmxdevfilter->params.pes.output == DMX_OUT_TSDEMUX_TAP)
 412                 buffer = &dmxdevfilter->buffer;
 413         else
 414                 buffer = &dmxdevfilter->dev->dvr_buffer;
 415         if (buffer->error) {
 416                 spin_unlock(&dmxdevfilter->dev->lock);
 417                 wake_up(&buffer->queue);
 418                 return 0;
 419         }
 420         ret = dvb_dmxdev_buffer_write(buffer, buffer1, buffer1_len);
 421         if (ret == buffer1_len)
 422                 ret = dvb_dmxdev_buffer_write(buffer, buffer2, buffer2_len);
 423         if (ret < 0) {
 424                 dvb_ringbuffer_flush(buffer);
 425                 buffer->error = ret;
 426         }
 427         spin_unlock(&dmxdevfilter->dev->lock);
 428         wake_up(&buffer->queue);
 429         return 0;
 430 }
 431
 432 /* stop feed but only mark the specified filter as stopped (state set) */
 433 static int dvb_dmxdev_feed_stop(struct dmxdev_filter *dmxdevfilter)
 434 {
 435         struct dmxdev_feed *feed;
 436
 437         dvb_dmxdev_filter_state_set(dmxdevfilter, DMXDEV_STATE_SET);
 438
 439         switch (dmxdevfilter->type) {
 440         case DMXDEV_TYPE_SEC:
 441                 del_timer(&dmxdevfilter->timer);
 442                 dmxdevfilter->feed.sec->stop_filtering(dmxdevfilter->feed.sec);
 443                 break;
 444         case DMXDEV_TYPE_PES:
 445                 list_for_each_entry(feed, &dmxdevfilter->feed.ts, next)
 446                         feed->ts->stop_filtering(feed->ts);
 447                 break;
 448         default:
 449                 return -EINVAL;
 450         }
 451         return 0;
 452 }
 453
 454 /* start feed associated with the specified filter */
 455 static int dvb_dmxdev_feed_start(struct dmxdev_filter *filter)
 456 {
 457         struct dmxdev_feed *feed;
 458         int ret;
 459
 460         dvb_dmxdev_filter_state_set(filter, DMXDEV_STATE_GO);
 461
 462         switch (filter->type) {
 463         case DMXDEV_TYPE_SEC:
 464                 return filter->feed.sec->start_filtering(filter->feed.sec);
 465         case DMXDEV_TYPE_PES:
 466                 list_for_each_entry(feed, &filter->feed.ts, next) {
 467                         ret = feed->ts->start_filtering(feed->ts);
 468                         if (ret < 0) {
 469                                 dvb_dmxdev_feed_stop(filter);
 470                                 return ret;
 471                         }
 472                 }
 473                 break;
 474         default:
 475                 return -EINVAL;
 476         }
 477
 478         return 0;
 479 }
 480
 481 /* restart section feed if it has filters left associated with it,
 482    otherwise release the feed */
 483 static int dvb_dmxdev_feed_restart(struct dmxdev_filter *filter)
 484 {
 485         int i;
 486         struct dmxdev *dmxdev = filter->dev;
 487         u16 pid = filter->params.sec.pid;
 488
 489         for (i = 0; i < dmxdev->filternum; i++)
 490                 if (dmxdev->filter[i].state >= DMXDEV_STATE_GO &&
 491                     dmxdev->filter[i].type == DMXDEV_TYPE_SEC &&
 492                     dmxdev->filter[i].params.sec.pid == pid) {
 493                         dvb_dmxdev_feed_start(&dmxdev->filter[i]);
 494                         return 0;
 495                 }
 496
 497         filter->dev->demux->release_section_feed(dmxdev->demux,
 498                                                  filter->feed.sec);
 499
 500         return 0;
 501 }
 502
 503 static int dvb_dmxdev_filter_stop(struct dmxdev_filter *dmxdevfilter)
 504 {
 505         struct dmxdev_feed *feed;
 506         struct dmx_demux *demux;
 507
 508         if (dmxdevfilter->state < DMXDEV_STATE_GO)
 509                 return 0;
 510
 511         switch (dmxdevfilter->type) {
 512         case DMXDEV_TYPE_SEC:
 513                 if (!dmxdevfilter->feed.sec)
 514                         break;
 515                 dvb_dmxdev_feed_stop(dmxdevfilter);
 516                 if (dmxdevfilter->filter.sec)
 517                         dmxdevfilter->feed.sec->
 518                             release_filter(dmxdevfilter->feed.sec,
 519                                            dmxdevfilter->filter.sec);
 520                 dvb_dmxdev_feed_restart(dmxdevfilter);
 521                 dmxdevfilter->feed.sec = NULL;
 522                 break;
 523         case DMXDEV_TYPE_PES:
 524                 dvb_dmxdev_feed_stop(dmxdevfilter);
 525                 demux = dmxdevfilter->dev->demux;
 526                 list_for_each_entry(feed, &dmxdevfilter->feed.ts, next) {
 527                         demux->release_ts_feed(demux, feed->ts);
 528                         feed->ts = NULL;
 529                 }
 530                 break;
 531         default:
 532                 if (dmxdevfilter->state == DMXDEV_STATE_ALLOCATED)
 533                         return 0;
 534                 return -EINVAL;
 535         }
 536
 537         dvb_ringbuffer_flush(&dmxdevfilter->buffer);
 538         return 0;
 539 }
 540
 541 static void dvb_dmxdev_delete_pids(struct dmxdev_filter *dmxdevfilter)
 542 {
 543         struct dmxdev_feed *feed, *tmp;
 544
 545         /* delete all PIDs */
 546         list_for_each_entry_safe(feed, tmp, &dmxdevfilter->feed.ts, next) {
 547                 list_del(&feed->next);
 548                 kfree(feed);
 549         }
 550
 551         BUG_ON(!list_empty(&dmxdevfilter->feed.ts));
 552 }
 553
 554 static inline int dvb_dmxdev_filter_reset(struct dmxdev_filter *dmxdevfilter)
 555 {
 556         if (dmxdevfilter->state < DMXDEV_STATE_SET)
 557                 return 0;
 558
 559         if (dmxdevfilter->type == DMXDEV_TYPE_PES)
 560                 dvb_dmxdev_delete_pids(dmxdevfilter);
 561
 562         dmxdevfilter->type = DMXDEV_TYPE_NONE;
 563         dvb_dmxdev_filter_state_set(dmxdevfilter, DMXDEV_STATE_ALLOCATED);
 564         return 0;
 565 }
 566
 567 static int dvb_dmxdev_start_feed(struct dmxdev *dmxdev,
 568                                  struct dmxdev_filter *filter,
 569                                  struct dmxdev_feed *feed)
 570 {
 571         struct timespec timeout = { 0 };
 572         struct dmx_pes_filter_params *para = &filter->params.pes;
 573         dmx_output_t otype;
 574         int ret;
 575         int ts_type;
 576         enum dmx_ts_pes ts_pes;
 577         struct dmx_ts_feed *tsfeed;
 578
 579         feed->ts = NULL;
 580         otype = para->output;
 581
 582         ts_pes = (enum dmx_ts_pes)para->pes_type;
 583
 584         if (ts_pes < DMX_PES_OTHER)
 585                 ts_type = TS_DECODER;
 586         else
 587                 ts_type = 0;
 588
 589         if (otype == DMX_OUT_TS_TAP)
 590                 ts_type |= TS_PACKET;
 591         else if (otype == DMX_OUT_TSDEMUX_TAP)
 592                 ts_type |= TS_PACKET | TS_DEMUX;
 593         else if (otype == DMX_OUT_TAP)
 594                 ts_type |= TS_PACKET | TS_DEMUX | TS_PAYLOAD_ONLY;
 595
 596         ret = dmxdev->demux->allocate_ts_feed(dmxdev->demux, &feed->ts,
 597                                               dvb_dmxdev_ts_callback);
 598         if (ret < 0)
 599                 return ret;
 600
 601         tsfeed = feed->ts;
 602         tsfeed->priv = filter;
 603
 604         ret = tsfeed->set(tsfeed, feed->pid, ts_type, ts_pes, 32768, timeout);
 605         if (ret < 0) {
 606                 dmxdev->demux->release_ts_feed(dmxdev->demux, tsfeed);
 607                 return ret;
 608         }
 609
 610         ret = tsfeed->start_filtering(tsfeed);
 611         if (ret < 0) {
 612                 dmxdev->demux->release_ts_feed(dmxdev->demux, tsfeed);
 613                 return ret;
 614         }
 615
 616         return 0;
 617 }
 618
 619 static int dvb_dmxdev_filter_start(struct dmxdev_filter *filter)
 620 {
 621         struct dmxdev *dmxdev = filter->dev;
 622         struct dmxdev_feed *feed;
 623         void *mem;
 624         int ret, i;
 625
 626         if (filter->state < DMXDEV_STATE_SET)
 627                 return -EINVAL;
 628
 629         if (filter->state >= DMXDEV_STATE_GO)
 630                 dvb_dmxdev_filter_stop(filter);
 631
 632         if (!filter->buffer.data) {
 633                 mem = vmalloc(filter->buffer.size);
 634                 if (!mem)
 635                         return -ENOMEM;
 636                 spin_lock_irq(&filter->dev->lock);
 637                 filter->buffer.data = mem;
 638                 spin_unlock_irq(&filter->dev->lock);
 639         }
 640
 641         dvb_ringbuffer_flush(&filter->buffer);
 642
 643         switch (filter->type) {
 644         case DMXDEV_TYPE_SEC:
 645         {
 646                 struct dmx_sct_filter_params *para = &filter->params.sec;
 647                 struct dmx_section_filter **secfilter = &filter->filter.sec;
 648                 struct dmx_section_feed **secfeed = &filter->feed.sec;
 649
 650                 *secfilter = NULL;
 651                 *secfeed = NULL;
 652
 653
 654                 /* find active filter/feed with same PID */
 655                 for (i = 0; i < dmxdev->filternum; i++) {
 656                         if (dmxdev->filter[i].state >= DMXDEV_STATE_GO &&
 657                             dmxdev->filter[i].type == DMXDEV_TYPE_SEC &&
 658                             dmxdev->filter[i].params.sec.pid == para->pid) {
 659                                 *secfeed = dmxdev->filter[i].feed.sec;
 660                                 break;
 661                         }
 662                 }
 663
 664                 /* if no feed found, try to allocate new one */
 665                 if (!*secfeed) {
 666                         ret = dmxdev->demux->allocate_section_feed(dmxdev->demux,
 667                                                                    secfeed,
 668                                                                    dvb_dmxdev_section_callback);
 669                         if (ret < 0) {
 670                                 printk("DVB (%s): could not alloc feed\n",
 671                                        __func__);
 672                                 return ret;
 673                         }
 674
 675                         ret = (*secfeed)->set(*secfeed, para->pid, 32768,
 676                                               (para->flags & DMX_CHECK_CRC) ? 1 : 0);
 677                         if (ret < 0) {
 678                                 printk("DVB (%s): could not set feed\n",
 679                                        __func__);
 680                                 dvb_dmxdev_feed_restart(filter);
 681                                 return ret;
 682                         }
 683                 } else {
 684                         dvb_dmxdev_feed_stop(filter);
 685                 }
 686
 687                 ret = (*secfeed)->allocate_filter(*secfeed, secfilter);
 688                 if (ret < 0) {
 689                         dvb_dmxdev_feed_restart(filter);
 690                         filter->feed.sec->start_filtering(*secfeed);
 691                         dprintk("could not get filter\n");
 692                         return ret;
 693                 }
 694
 695                 (*secfilter)->priv = filter;
 696
 697                 memcpy(&((*secfilter)->filter_value[3]),
 698                        &(para->filter.filter[1]), DMX_FILTER_SIZE - 1);
 699                 memcpy(&(*secfilter)->filter_mask[3],
 700                        &para->filter.mask[1], DMX_FILTER_SIZE - 1);
 701                 memcpy(&(*secfilter)->filter_mode[3],
 702                        &para->filter.mode[1], DMX_FILTER_SIZE - 1);
 703
 704                 (*secfilter)->filter_value[0] = para->filter.filter[0];
 705                 (*secfilter)->filter_mask[0] = para->filter.mask[0];
 706                 (*secfilter)->filter_mode[0] = para->filter.mode[0];
 707                 (*secfilter)->filter_mask[1] = 0;
 708                 (*secfilter)->filter_mask[2] = 0;
 709
 710                 filter->todo = 0;
 711
 712                 ret = filter->feed.sec->start_filtering(filter->feed.sec);
 713                 if (ret < 0)
 714                         return ret;
 715
 716                 dvb_dmxdev_filter_timer(filter);
 717                 break;
 718         }
 719         case DMXDEV_TYPE_PES:
 720                 list_for_each_entry(feed, &filter->feed.ts, next) {
 721                         ret = dvb_dmxdev_start_feed(dmxdev, filter, feed);
 722                         if (ret < 0) {
 723                                 dvb_dmxdev_filter_stop(filter);
 724                                 return ret;
 725                         }
 726                 }
 727                 break;
 728         default:
 729                 return -EINVAL;
 730         }
 731
 732         dvb_dmxdev_filter_state_set(filter, DMXDEV_STATE_GO);
 733         return 0;
 734 }
 735
 736 static int dvb_demux_open(struct inode *inode, struct file *file)
 737 {
 738         struct dvb_device *dvbdev = file->private_data;
 739         struct dmxdev *dmxdev = dvbdev->priv;
 740         int i;
 741         struct dmxdev_filter *dmxdevfilter;
 742
 743         if (!dmxdev->filter)
 744                 return -EINVAL;
 745
 746         if (mutex_lock_interruptible(&dmxdev->mutex))
 747                 return -ERESTARTSYS;
 748
 749         for (i = 0; i < dmxdev->filternum; i++)
 750                 if (dmxdev->filter[i].state == DMXDEV_STATE_FREE)
 751                         break;
 752
 753         if (i == dmxdev->filternum) {
 754                 mutex_unlock(&dmxdev->mutex);
 755                 return -EMFILE;
 756         }
 757
 758         dmxdevfilter = &dmxdev->filter[i];
 759         mutex_init(&dmxdevfilter->mutex);
 760         file->private_data = dmxdevfilter;
 761
 762         dvb_ringbuffer_init(&dmxdevfilter->buffer, NULL, 8192);
 763         dmxdevfilter->type = DMXDEV_TYPE_NONE;
 764         dvb_dmxdev_filter_state_set(dmxdevfilter, DMXDEV_STATE_ALLOCATED);
 765         init_timer(&dmxdevfilter->timer);
 766
 767         dvbdev->users++;
 768
 769         mutex_unlock(&dmxdev->mutex);
 770         return 0;
 771 }
 772
 773 static int dvb_dmxdev_filter_free(struct dmxdev *dmxdev,
 774                                   struct dmxdev_filter *dmxdevfilter)
 775 {
 776         mutex_lock(&dmxdev->mutex);
 777         mutex_lock(&dmxdevfilter->mutex);
 778
 779         dvb_dmxdev_filter_stop(dmxdevfilter);
 780         dvb_dmxdev_filter_reset(dmxdevfilter);
 781
 782         if (dmxdevfilter->buffer.data) {
 783                 void *mem = dmxdevfilter->buffer.data;
 784
 785                 spin_lock_irq(&dmxdev->lock);
 786                 dmxdevfilter->buffer.data = NULL;
 787                 spin_unlock_irq(&dmxdev->lock);
 788                 vfree(mem);
 789         }
 790
 791         dvb_dmxdev_filter_state_set(dmxdevfilter, DMXDEV_STATE_FREE);
 792         wake_up(&dmxdevfilter->buffer.queue);
 793         mutex_unlock(&dmxdevfilter->mutex);
 794         mutex_unlock(&dmxdev->mutex);
 795         return 0;
 796 }
 797
 798 static inline void invert_mode(dmx_filter_t *filter)
 799 {
 800         int i;
 801
 802         for (i = 0; i < DMX_FILTER_SIZE; i++)
 803                 filter->mode[i] ^= 0xff;
 804 }
 805
 806 static int dvb_dmxdev_add_pid(struct dmxdev *dmxdev,
 807                               struct dmxdev_filter *filter, u16 pid)
 808 {
 809         struct dmxdev_feed *feed;
 810
 811         if ((filter->type != DMXDEV_TYPE_PES) ||
 812             (filter->state < DMXDEV_STATE_SET))
 813                 return -EINVAL;
 814
 815         /* only TS packet filters may have multiple PIDs */
 816         if ((filter->params.pes.output != DMX_OUT_TSDEMUX_TAP) &&
 817             (!list_empty(&filter->feed.ts)))
 818                 return -EINVAL;
 819
 820         feed = kzalloc(sizeof(struct dmxdev_feed), GFP_KERNEL);
 821         if (feed == NULL)
 822                 return -ENOMEM;
 823
 824         feed->pid = pid;
 825         list_add(&feed->next, &filter->feed.ts);
 826
 827         if (filter->state >= DMXDEV_STATE_GO)
 828                 return dvb_dmxdev_start_feed(dmxdev, filter, feed);
 829
 830         return 0;
 831 }
 832
 833 static int dvb_dmxdev_remove_pid(struct dmxdev *dmxdev,
 834                                   struct dmxdev_filter *filter, u16 pid)
 835 {
 836         struct dmxdev_feed *feed, *tmp;
 837
 838         if ((filter->type != DMXDEV_TYPE_PES) ||
 839             (filter->state < DMXDEV_STATE_SET))
 840                 return -EINVAL;
 841
 842         list_for_each_entry_safe(feed, tmp, &filter->feed.ts, next) {
 843                 if ((feed->pid == pid) && (feed->ts != NULL)) {
 844                         feed->ts->stop_filtering(feed->ts);
 845                         filter->dev->demux->release_ts_feed(filter->dev->demux,
 846                                                             feed->ts);
 847                         list_del(&feed->next);
 848                         kfree(feed);
 849                 }
 850         }
 851
 852         return 0;
 853 }
 854
 855 static int dvb_dmxdev_filter_set(struct dmxdev *dmxdev,
 856                                  struct dmxdev_filter *dmxdevfilter,
 857                                  struct dmx_sct_filter_params *params)
 858 {
 859         dprintk("function : %s\n", __func__);
 860
 861         dvb_dmxdev_filter_stop(dmxdevfilter);
 862
 863         dmxdevfilter->type = DMXDEV_TYPE_SEC;
 864         memcpy(&dmxdevfilter->params.sec,
 865                params, sizeof(struct dmx_sct_filter_params));
 866         invert_mode(&dmxdevfilter->params.sec.filter);
 867         dvb_dmxdev_filter_state_set(dmxdevfilter, DMXDEV_STATE_SET);
 868
 869         if (params->flags & DMX_IMMEDIATE_START)
 870                 return dvb_dmxdev_filter_start(dmxdevfilter);
 871
 872         return 0;
 873 }
 874
 875 static int dvb_dmxdev_pes_filter_set(struct dmxdev *dmxdev,
 876                                      struct dmxdev_filter *dmxdevfilter,
 877                                      struct dmx_pes_filter_params *params)
 878 {
 879         int ret;
 880
 881         dvb_dmxdev_filter_stop(dmxdevfilter);
 882         dvb_dmxdev_filter_reset(dmxdevfilter);
 883
 884         if (params->pes_type > DMX_PES_OTHER || params->pes_type < 0)
 885                 return -EINVAL;
 886
 887         dmxdevfilter->type = DMXDEV_TYPE_PES;
 888         memcpy(&dmxdevfilter->params, params,
 889                sizeof(struct dmx_pes_filter_params));
 890         INIT_LIST_HEAD(&dmxdevfilter->feed.ts);
 891
 892         dvb_dmxdev_filter_state_set(dmxdevfilter, DMXDEV_STATE_SET);
 893
 894         ret = dvb_dmxdev_add_pid(dmxdev, dmxdevfilter,
 895                                  dmxdevfilter->params.pes.pid);
 896         if (ret < 0)
 897                 return ret;
 898
 899         if (params->flags & DMX_IMMEDIATE_START)
 900                 return dvb_dmxdev_filter_start(dmxdevfilter);
 901
 902         return 0;
 903 }
 904
 905 static ssize_t dvb_dmxdev_read_sec(struct dmxdev_filter *dfil,
 906                                    struct file *file, char __user *buf,
 907                                    size_t count, loff_t *ppos)
 908 {
 909         int result, hcount;
 910         int done = 0;
 911
 912         if (dfil->todo <= 0) {
 913                 hcount = 3 + dfil->todo;
 914                 if (hcount > count)
 915                         hcount = count;
 916                 result = dvb_dmxdev_buffer_read(&dfil->buffer,
 917                                                 file->f_flags & O_NONBLOCK,
 918                                                 buf, hcount, ppos);
 919                 if (result < 0) {
 920                         dfil->todo = 0;
 921                         return result;
 922                 }
 923                 if (copy_from_user(dfil->secheader - dfil->todo, buf, result))
 924                         return -EFAULT;
 925                 buf += result;
 926                 done = result;
 927                 count -= result;
 928                 dfil->todo -= result;
 929                 if (dfil->todo > -3)
 930                         return done;
 931                 dfil->todo = ((dfil->secheader[1] << 8) | dfil->secheader[2]) & 0xfff;
 932                 if (!count)
 933                         return done;
 934         }
 935         if (count > dfil->todo)
 936                 count = dfil->todo;
 937         result = dvb_dmxdev_buffer_read(&dfil->buffer,
 938                                         file->f_flags & O_NONBLOCK,
 939                                         buf, count, ppos);
 940         if (result < 0)
 941                 return result;
 942         dfil->todo -= result;
 943         return (result + done);
 944 }
 945
 946 static ssize_t
 947 dvb_demux_read(struct file *file, char __user *buf, size_t count,
 948                loff_t *ppos)
 949 {
 950         struct dmxdev_filter *dmxdevfilter = file->private_data;
 951         int ret;
 952
 953         if (mutex_lock_interruptible(&dmxdevfilter->mutex))
 954                 return -ERESTARTSYS;
 955
 956         if (dmxdevfilter->type == DMXDEV_TYPE_SEC)
 957                 ret = dvb_dmxdev_read_sec(dmxdevfilter, file, buf, count, ppos);
 958         else
 959                 ret = dvb_dmxdev_buffer_read(&dmxdevfilter->buffer,
 960                                              file->f_flags & O_NONBLOCK,
 961                                              buf, count, ppos);
 962
 963         mutex_unlock(&dmxdevfilter->mutex);
 964         return ret;
 965 }
 966
 967 static int dvb_demux_do_ioctl(struct file *file,
 968                               unsigned int cmd, void *parg)
 969 {
 970         struct dmxdev_filter *dmxdevfilter = file->private_data;
 971         struct dmxdev *dmxdev = dmxdevfilter->dev;
 972         unsigned long arg = (unsigned long)parg;
 973         int ret = 0;
 974
 975         if (mutex_lock_interruptible(&dmxdev->mutex))
 976                 return -ERESTARTSYS;
 977
 978         switch (cmd) {
 979         case DMX_START:
 980                 if (mutex_lock_interruptible(&dmxdevfilter->mutex)) {
 981                         mutex_unlock(&dmxdev->mutex);
 982                         return -ERESTARTSYS;
 983                 }
 984                 if (dmxdevfilter->state < DMXDEV_STATE_SET)
 985                         ret = -EINVAL;
 986                 else
 987                         ret = dvb_dmxdev_filter_start(dmxdevfilter);
 988                 mutex_unlock(&dmxdevfilter->mutex);
 989                 break;
 990
 991         case DMX_STOP:
 992                 if (mutex_lock_interruptible(&dmxdevfilter->mutex)) {
 993                         mutex_unlock(&dmxdev->mutex);
 994                         return -ERESTARTSYS;
 995                 }
 996                 ret = dvb_dmxdev_filter_stop(dmxdevfilter);
 997                 mutex_unlock(&dmxdevfilter->mutex);
 998                 break;
 999
1000         case DMX_SET_FILTER:
1001                 if (mutex_lock_interruptible(&dmxdevfilter->mutex)) {
1002                         mutex_unlock(&dmxdev->mutex);
1003                         return -ERESTARTSYS;
1004                 }
1005                 ret = dvb_dmxdev_filter_set(dmxdev, dmxdevfilter, parg);
1006                 mutex_unlock(&dmxdevfilter->mutex);
1007                 break;
1008
1009         case DMX_SET_PES_FILTER:
1010                 if (mutex_lock_interruptible(&dmxdevfilter->mutex)) {
1011                         mutex_unlock(&dmxdev->mutex);
1012                         return -ERESTARTSYS;
1013                 }
1014                 ret = dvb_dmxdev_pes_filter_set(dmxdev, dmxdevfilter, parg);
1015                 mutex_unlock(&dmxdevfilter->mutex);
1016                 break;
1017
1018         case DMX_SET_BUFFER_SIZE:
1019                 if (mutex_lock_interruptible(&dmxdevfilter->mutex)) {
1020                         mutex_unlock(&dmxdev->mutex);
1021                         return -ERESTARTSYS;
1022                 }
1023                 ret = dvb_dmxdev_set_buffer_size(dmxdevfilter, arg);
1024                 mutex_unlock(&dmxdevfilter->mutex);
1025                 break;
1026
1027         case DMX_GET_PES_PIDS:
1028                 if (!dmxdev->demux->get_pes_pids) {
1029                         ret = -EINVAL;
1030                         break;
1031                 }
1032                 dmxdev->demux->get_pes_pids(dmxdev->demux, parg);
1033                 break;
1034
1035         case DMX_GET_CAPS:
1036                 if (!dmxdev->demux->get_caps) {
1037                         ret = -EINVAL;
1038                         break;
1039                 }
1040                 ret = dmxdev->demux->get_caps(dmxdev->demux, parg);
1041                 break;
1042
1043         case DMX_SET_SOURCE:
1044                 if (!dmxdev->demux->set_source) {
1045                         ret = -EINVAL;
1046                         break;
1047                 }
1048                 ret = dmxdev->demux->set_source(dmxdev->demux, parg);
1049                 break;
1050
1051         case DMX_GET_STC:
1052                 if (!dmxdev->demux->get_stc) {
1053                         ret = -EINVAL;
1054                         break;
1055                 }
1056                 ret = dmxdev->demux->get_stc(dmxdev->demux,
1057                                              ((struct dmx_stc *)parg)->num,
1058                                              &((struct dmx_stc *)parg)->stc,
1059                                              &((struct dmx_stc *)parg)->base);
1060                 break;
1061
1062         case DMX_ADD_PID:
1063                 if (mutex_lock_interruptible(&dmxdevfilter->mutex)) {
1064                         ret = -ERESTARTSYS;
1065                         break;
1066                 }
1067                 ret = dvb_dmxdev_add_pid(dmxdev, dmxdevfilter, *(u16 *)parg);
1068                 mutex_unlock(&dmxdevfilter->mutex);
1069                 break;
1070
1071         case DMX_REMOVE_PID:
1072                 if (mutex_lock_interruptible(&dmxdevfilter->mutex)) {
1073                         ret = -ERESTARTSYS;
1074                         break;
1075                 }
1076                 ret = dvb_dmxdev_remove_pid(dmxdev, dmxdevfilter, *(u16 *)parg);
1077                 mutex_unlock(&dmxdevfilter->mutex);
1078                 break;
1079
1080         default:
1081                 ret = -EINVAL;
1082                 break;
1083         }
1084         mutex_unlock(&dmxdev->mutex);
1085         return ret;
1086 }
1087
1088 static long dvb_demux_ioctl(struct file *file, unsigned int cmd,
1089                             unsigned long arg)
1090 {
1091         int ret;
1092
1093         lock_kernel();
1094         ret = dvb_usercopy(file, cmd, arg, dvb_demux_do_ioctl);
1095         unlock_kernel();
1096
1097         return ret;
1098 }
1099
1100 static unsigned int dvb_demux_poll(struct file *file, poll_table *wait)
1101 {
1102         struct dmxdev_filter *dmxdevfilter = file->private_data;
1103         unsigned int mask = 0;
1104
1105         if (!dmxdevfilter)
1106                 return -EINVAL;
1107
1108         poll_wait(file, &dmxdevfilter->buffer.queue, wait);
1109
1110         if (dmxdevfilter->state != DMXDEV_STATE_GO &&
1111             dmxdevfilter->state != DMXDEV_STATE_DONE &&
1112             dmxdevfilter->state != DMXDEV_STATE_TIMEDOUT)
1113                 return 0;
1114
1115         if (dmxdevfilter->buffer.error)
1116                 mask |= (POLLIN | POLLRDNORM | POLLPRI | POLLERR);
1117
1118         if (!dvb_ringbuffer_empty(&dmxdevfilter->buffer))
1119                 mask |= (POLLIN | POLLRDNORM | POLLPRI);
1120
1121         return mask;
1122 }
1123
1124 static int dvb_demux_release(struct inode *inode, struct file *file)
1125 {
1126         struct dmxdev_filter *dmxdevfilter = file->private_data;
1127         struct dmxdev *dmxdev = dmxdevfilter->dev;
1128
1129         int ret;
1130
1131         ret = dvb_dmxdev_filter_free(dmxdev, dmxdevfilter);
1132
1133         mutex_lock(&dmxdev->mutex);
1134         dmxdev->dvbdev->users--;
1135         if(dmxdev->dvbdev->users==1 && dmxdev->exit==1) {
1136                 fops_put(file->f_op);
1137                 file->f_op = NULL;
1138                 mutex_unlock(&dmxdev->mutex);
1139                 wake_up(&dmxdev->dvbdev->wait_queue);
1140         } else
1141                 mutex_unlock(&dmxdev->mutex);
1142
1143         return ret;
1144 }
1145
1146 static const struct file_operations dvb_demux_fops = {
1147         .owner = THIS_MODULE,
1148         .read = dvb_demux_read,
1149         .unlocked_ioctl = dvb_demux_ioctl,
1150         .open = dvb_demux_open,
1151         .release = dvb_demux_release,
1152         .poll = dvb_demux_poll,
1153 };
1154
1155 static struct dvb_device dvbdev_demux = {
1156         .priv = NULL,
1157         .users = 1,
1158         .writers = 1,
1159         .fops = &dvb_demux_fops
1160 };
1161
1162 static int dvb_dvr_do_ioctl(struct file *file,
1163                             unsigned int cmd, void *parg)
1164 {
1165         struct dvb_device *dvbdev = file->private_data;
1166         struct dmxdev *dmxdev = dvbdev->priv;
1167         unsigned long arg = (unsigned long)parg;
1168         int ret;
1169
1170         if (mutex_lock_interruptible(&dmxdev->mutex))
1171                 return -ERESTARTSYS;
1172
1173         switch (cmd) {
1174         case DMX_SET_BUFFER_SIZE:
1175                 ret = dvb_dvr_set_buffer_size(dmxdev, arg);
1176                 break;
1177
1178         default:
1179                 ret = -EINVAL;
1180                 break;
1181         }
1182         mutex_unlock(&dmxdev->mutex);
1183         return ret;
1184 }
1185
1186 static long dvb_dvr_ioctl(struct file *file,
1187                          unsigned int cmd, unsigned long arg)
1188 {
1189         int ret;
1190
1191         lock_kernel();
1192         ret = dvb_usercopy(file, cmd, arg, dvb_dvr_do_ioctl);
1193         unlock_kernel();
1194
1195         return ret;
1196 }
1197
1198 static unsigned int dvb_dvr_poll(struct file *file, poll_table *wait)
1199 {
1200         struct dvb_device *dvbdev = file->private_data;
1201         struct dmxdev *dmxdev = dvbdev->priv;
1202         unsigned int mask = 0;
1203
1204         dprintk("function : %s\n", __func__);
1205
1206         poll_wait(file, &dmxdev->dvr_buffer.queue, wait);
1207
1208         if ((file->f_flags & O_ACCMODE) == O_RDONLY) {
1209                 if (dmxdev->dvr_buffer.error)
1210                         mask |= (POLLIN | POLLRDNORM | POLLPRI | POLLERR);
1211
1212                 if (!dvb_ringbuffer_empty(&dmxdev->dvr_buffer))
1213                         mask |= (POLLIN | POLLRDNORM | POLLPRI);
1214         } else
1215                 mask |= (POLLOUT | POLLWRNORM | POLLPRI);
1216
1217         return mask;
1218 }
1219
1220 static const struct file_operations dvb_dvr_fops = {
1221         .owner = THIS_MODULE,
1222         .read = dvb_dvr_read,
1223         .write = dvb_dvr_write,
1224         .unlocked_ioctl = dvb_dvr_ioctl,
1225         .open = dvb_dvr_open,
1226         .release = dvb_dvr_release,
1227         .poll = dvb_dvr_poll,
1228 };
1229
1230 static struct dvb_device dvbdev_dvr = {
1231         .priv = NULL,
1232         .readers = 1,
1233         .users = 1,
1234         .fops = &dvb_dvr_fops
1235 };
1236
1237 int dvb_dmxdev_init(struct dmxdev *dmxdev, struct dvb_adapter *dvb_adapter)
1238 {
1239         int i;
1240
1241         if (dmxdev->demux->open(dmxdev->demux) < 0)
1242                 return -EUSERS;
1243
1244         dmxdev->filter = vmalloc(dmxdev->filternum * sizeof(struct dmxdev_filter));
1245         if (!dmxdev->filter)
1246                 return -ENOMEM;
1247
1248         mutex_init(&dmxdev->mutex);
1249         spin_lock_init(&dmxdev->lock);
1250         for (i = 0; i < dmxdev->filternum; i++) {
1251                 dmxdev->filter[i].dev = dmxdev;
1252                 dmxdev->filter[i].buffer.data = NULL;
1253                 dvb_dmxdev_filter_state_set(&dmxdev->filter[i],
1254                                             DMXDEV_STATE_FREE);
1255         }
1256
1257         dvb_register_device(dvb_adapter, &dmxdev->dvbdev, &dvbdev_demux, dmxdev,
1258                             DVB_DEVICE_DEMUX);
1259         dvb_register_device(dvb_adapter, &dmxdev->dvr_dvbdev, &dvbdev_dvr,
1260                             dmxdev, DVB_DEVICE_DVR);
1261
1262         dvb_ringbuffer_init(&dmxdev->dvr_buffer, NULL, 8192);
1263
1264         return 0;
1265 }
1266
1267 EXPORT_SYMBOL(dvb_dmxdev_init);
1268
1269 void dvb_dmxdev_release(struct dmxdev *dmxdev)
1270 {
1271         dmxdev->exit=1;
1272         if (dmxdev->dvbdev->users > 1) {
1273                 wait_event(dmxdev->dvbdev->wait_queue,
1274                                 dmxdev->dvbdev->users==1);
1275         }
1276         if (dmxdev->dvr_dvbdev->users > 1) {
1277                 wait_event(dmxdev->dvr_dvbdev->wait_queue,
1278                                 dmxdev->dvr_dvbdev->users==1);
1279         }
1280
1281         dvb_unregister_device(dmxdev->dvbdev);
1282         dvb_unregister_device(dmxdev->dvr_dvbdev);
1283
1284         vfree(dmxdev->filter);
1285         dmxdev->filter = NULL;
1286         dmxdev->demux->close(dmxdev->demux);
1287 }
1288
1289 EXPORT_SYMBOL(dvb_dmxdev_release);