kernel/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                 mutex_unlock(&dmxdev->mutex);
 210                 wake_up(&dvbdev->wait_queue);
 211         } else
 212                 mutex_unlock(&dmxdev->mutex);
 213
 214         return 0;
 215 }
 216
 217 static ssize_t dvb_dvr_write(struct file *file, const char __user *buf,
 218                              size_t count, loff_t *ppos)
 219 {
 220         struct dvb_device *dvbdev = file->private_data;
 221         struct dmxdev *dmxdev = dvbdev->priv;
 222         int ret;
 223
 224         if (!dmxdev->demux->write)
 225                 return -EOPNOTSUPP;
 226         if ((file->f_flags & O_ACCMODE) != O_WRONLY)
 227                 return -EINVAL;
 228         if (mutex_lock_interruptible(&dmxdev->mutex))
 229                 return -ERESTARTSYS;
 230
 231         if (dmxdev->exit) {
 232                 mutex_unlock(&dmxdev->mutex);
 233                 return -ENODEV;
 234         }
 235         ret = dmxdev->demux->write(dmxdev->demux, buf, count);
 236         mutex_unlock(&dmxdev->mutex);
 237         return ret;
 238 }
 239
 240 static ssize_t dvb_dvr_read(struct file *file, char __user *buf, size_t count,
 241                             loff_t *ppos)
 242 {
 243         struct dvb_device *dvbdev = file->private_data;
 244         struct dmxdev *dmxdev = dvbdev->priv;
 245
 246         if (dmxdev->exit)
 247                 return -ENODEV;
 248
 249         return dvb_dmxdev_buffer_read(&dmxdev->dvr_buffer,
 250                                       file->f_flags & O_NONBLOCK,
 251                                       buf, count, ppos);
 252 }
 253
 254 static int dvb_dvr_set_buffer_size(struct dmxdev *dmxdev,
 255                                       unsigned long size)
 256 {
 257         struct dvb_ringbuffer *buf = &dmxdev->dvr_buffer;
 258         void *newmem;
 259         void *oldmem;
 260
 261         dprintk("function : %s\n", __func__);
 262
 263         if (buf->size == size)
 264                 return 0;
 265         if (!size)
 266                 return -EINVAL;
 267
 268         newmem = vmalloc(size);
 269         if (!newmem)
 270                 return -ENOMEM;
 271
 272         oldmem = buf->data;
 273
 274         spin_lock_irq(&dmxdev->lock);
 275         buf->data = newmem;
 276         buf->size = size;
 277
 278         /* reset and not flush in case the buffer shrinks */
 279         dvb_ringbuffer_reset(buf);
 280         spin_unlock_irq(&dmxdev->lock);
 281
 282         vfree(oldmem);
 283
 284         return 0;
 285 }
 286
 287 static inline void dvb_dmxdev_filter_state_set(struct dmxdev_filter
 288                                                *dmxdevfilter, int state)
 289 {
 290         spin_lock_irq(&dmxdevfilter->dev->lock);
 291         dmxdevfilter->state = state;
 292         spin_unlock_irq(&dmxdevfilter->dev->lock);
 293 }
 294
 295 static int dvb_dmxdev_set_buffer_size(struct dmxdev_filter *dmxdevfilter,
 296                                       unsigned long size)
 297 {
 298         struct dvb_ringbuffer *buf = &dmxdevfilter->buffer;
 299         void *newmem;
 300         void *oldmem;
 301
 302         if (buf->size == size)
 303                 return 0;
 304         if (!size)
 305                 return -EINVAL;
 306         if (dmxdevfilter->state >= DMXDEV_STATE_GO)
 307                 return -EBUSY;
 308
 309         newmem = vmalloc(size);
 310         if (!newmem)
 311                 return -ENOMEM;
 312
 313         oldmem = buf->data;
 314
 315         spin_lock_irq(&dmxdevfilter->dev->lock);
 316         buf->data = newmem;
 317         buf->size = size;
 318
 319         /* reset and not flush in case the buffer shrinks */
 320         dvb_ringbuffer_reset(buf);
 321         spin_unlock_irq(&dmxdevfilter->dev->lock);
 322
 323         vfree(oldmem);
 324
 325         return 0;
 326 }
 327
 328 static void dvb_dmxdev_filter_timeout(unsigned long data)
 329 {
 330         struct dmxdev_filter *dmxdevfilter = (struct dmxdev_filter *)data;
 331
 332         dmxdevfilter->buffer.error = -ETIMEDOUT;
 333         spin_lock_irq(&dmxdevfilter->dev->lock);
 334         dmxdevfilter->state = DMXDEV_STATE_TIMEDOUT;
 335         spin_unlock_irq(&dmxdevfilter->dev->lock);
 336         wake_up(&dmxdevfilter->buffer.queue);
 337 }
 338
 339 static void dvb_dmxdev_filter_timer(struct dmxdev_filter *dmxdevfilter)
 340 {
 341         struct dmx_sct_filter_params *para = &dmxdevfilter->params.sec;
 342
 343         del_timer(&dmxdevfilter->timer);
 344         if (para->timeout) {
 345                 dmxdevfilter->timer.function = dvb_dmxdev_filter_timeout;
 346                 dmxdevfilter->timer.data = (unsigned long)dmxdevfilter;
 347                 dmxdevfilter->timer.expires =
 348                     jiffies + 1 + (HZ / 2 + HZ * para->timeout) / 1000;
 349                 add_timer(&dmxdevfilter->timer);
 350         }
 351 }
 352
 353 static int dvb_dmxdev_section_callback(const u8 *buffer1, size_t buffer1_len,
 354                                        const u8 *buffer2, size_t buffer2_len,
 355                                        struct dmx_section_filter *filter,
 356                                        enum dmx_success success)
 357 {
 358         struct dmxdev_filter *dmxdevfilter = filter->priv;
 359         int ret;
 360
 361         if (dmxdevfilter->buffer.error) {
 362                 wake_up(&dmxdevfilter->buffer.queue);
 363                 return 0;
 364         }
 365         spin_lock(&dmxdevfilter->dev->lock);
 366         if (dmxdevfilter->state != DMXDEV_STATE_GO) {
 367                 spin_unlock(&dmxdevfilter->dev->lock);
 368                 return 0;
 369         }
 370         del_timer(&dmxdevfilter->timer);
 371         dprintk("dmxdev: section callback %*ph\n", 6, buffer1);
 372         ret = dvb_dmxdev_buffer_write(&dmxdevfilter->buffer, buffer1,
 373                                       buffer1_len);
 374         if (ret == buffer1_len) {
 375                 ret = dvb_dmxdev_buffer_write(&dmxdevfilter->buffer, buffer2,
 376                                               buffer2_len);
 377         }
 378         if (ret < 0)
 379                 dmxdevfilter->buffer.error = ret;
 380         if (dmxdevfilter->params.sec.flags & DMX_ONESHOT)
 381                 dmxdevfilter->state = DMXDEV_STATE_DONE;
 382         spin_unlock(&dmxdevfilter->dev->lock);
 383         wake_up(&dmxdevfilter->buffer.queue);
 384         return 0;
 385 }
 386
 387 static int dvb_dmxdev_ts_callback(const u8 *buffer1, size_t buffer1_len,
 388                                   const u8 *buffer2, size_t buffer2_len,
 389                                   struct dmx_ts_feed *feed,
 390                                   enum dmx_success success)
 391 {
 392         struct dmxdev_filter *dmxdevfilter = feed->priv;
 393         struct dvb_ringbuffer *buffer;
 394         int ret;
 395
 396         spin_lock(&dmxdevfilter->dev->lock);
 397         if (dmxdevfilter->params.pes.output == DMX_OUT_DECODER) {
 398                 spin_unlock(&dmxdevfilter->dev->lock);
 399                 return 0;
 400         }
 401
 402         if (dmxdevfilter->params.pes.output == DMX_OUT_TAP
 403             || dmxdevfilter->params.pes.output == DMX_OUT_TSDEMUX_TAP)
 404                 buffer = &dmxdevfilter->buffer;
 405         else
 406                 buffer = &dmxdevfilter->dev->dvr_buffer;
 407         if (buffer->error) {
 408                 spin_unlock(&dmxdevfilter->dev->lock);
 409                 wake_up(&buffer->queue);
 410                 return 0;
 411         }
 412         ret = dvb_dmxdev_buffer_write(buffer, buffer1, buffer1_len);
 413         if (ret == buffer1_len)
 414                 ret = dvb_dmxdev_buffer_write(buffer, buffer2, buffer2_len);
 415         if (ret < 0)
 416                 buffer->error = ret;
 417         spin_unlock(&dmxdevfilter->dev->lock);
 418         wake_up(&buffer->queue);
 419         return 0;
 420 }
 421
 422 /* stop feed but only mark the specified filter as stopped (state set) */
 423 static int dvb_dmxdev_feed_stop(struct dmxdev_filter *dmxdevfilter)
 424 {
 425         struct dmxdev_feed *feed;
 426
 427         dvb_dmxdev_filter_state_set(dmxdevfilter, DMXDEV_STATE_SET);
 428
 429         switch (dmxdevfilter->type) {
 430         case DMXDEV_TYPE_SEC:
 431                 del_timer(&dmxdevfilter->timer);
 432                 dmxdevfilter->feed.sec->stop_filtering(dmxdevfilter->feed.sec);
 433                 break;
 434         case DMXDEV_TYPE_PES:
 435                 list_for_each_entry(feed, &dmxdevfilter->feed.ts, next)
 436                         feed->ts->stop_filtering(feed->ts);
 437                 break;
 438         default:
 439                 return -EINVAL;
 440         }
 441         return 0;
 442 }
 443
 444 /* start feed associated with the specified filter */
 445 static int dvb_dmxdev_feed_start(struct dmxdev_filter *filter)
 446 {
 447         struct dmxdev_feed *feed;
 448         int ret;
 449
 450         dvb_dmxdev_filter_state_set(filter, DMXDEV_STATE_GO);
 451
 452         switch (filter->type) {
 453         case DMXDEV_TYPE_SEC:
 454                 return filter->feed.sec->start_filtering(filter->feed.sec);
 455         case DMXDEV_TYPE_PES:
 456                 list_for_each_entry(feed, &filter->feed.ts, next) {
 457                         ret = feed->ts->start_filtering(feed->ts);
 458                         if (ret < 0) {
 459                                 dvb_dmxdev_feed_stop(filter);
 460                                 return ret;
 461                         }
 462                 }
 463                 break;
 464         default:
 465                 return -EINVAL;
 466         }
 467
 468         return 0;
 469 }
 470
 471 /* restart section feed if it has filters left associated with it,
 472    otherwise release the feed */
 473 static int dvb_dmxdev_feed_restart(struct dmxdev_filter *filter)
 474 {
 475         int i;
 476         struct dmxdev *dmxdev = filter->dev;
 477         u16 pid = filter->params.sec.pid;
 478
 479         for (i = 0; i < dmxdev->filternum; i++)
 480                 if (dmxdev->filter[i].state >= DMXDEV_STATE_GO &&
 481                     dmxdev->filter[i].type == DMXDEV_TYPE_SEC &&
 482                     dmxdev->filter[i].params.sec.pid == pid) {
 483                         dvb_dmxdev_feed_start(&dmxdev->filter[i]);
 484                         return 0;
 485                 }
 486
 487         filter->dev->demux->release_section_feed(dmxdev->demux,
 488                                                  filter->feed.sec);
 489
 490         return 0;
 491 }
 492
 493 static int dvb_dmxdev_filter_stop(struct dmxdev_filter *dmxdevfilter)
 494 {
 495         struct dmxdev_feed *feed;
 496         struct dmx_demux *demux;
 497
 498         if (dmxdevfilter->state < DMXDEV_STATE_GO)
 499                 return 0;
 500
 501         switch (dmxdevfilter->type) {
 502         case DMXDEV_TYPE_SEC:
 503                 if (!dmxdevfilter->feed.sec)
 504                         break;
 505                 dvb_dmxdev_feed_stop(dmxdevfilter);
 506                 if (dmxdevfilter->filter.sec)
 507                         dmxdevfilter->feed.sec->
 508                             release_filter(dmxdevfilter->feed.sec,
 509                                            dmxdevfilter->filter.sec);
 510                 dvb_dmxdev_feed_restart(dmxdevfilter);
 511                 dmxdevfilter->feed.sec = NULL;
 512                 break;
 513         case DMXDEV_TYPE_PES:
 514                 dvb_dmxdev_feed_stop(dmxdevfilter);
 515                 demux = dmxdevfilter->dev->demux;
 516                 list_for_each_entry(feed, &dmxdevfilter->feed.ts, next) {
 517                         demux->release_ts_feed(demux, feed->ts);
 518                         feed->ts = NULL;
 519                 }
 520                 break;
 521         default:
 522                 if (dmxdevfilter->state == DMXDEV_STATE_ALLOCATED)
 523                         return 0;
 524                 return -EINVAL;
 525         }
 526
 527         dvb_ringbuffer_flush(&dmxdevfilter->buffer);
 528         return 0;
 529 }
 530
 531 static void dvb_dmxdev_delete_pids(struct dmxdev_filter *dmxdevfilter)
 532 {
 533         struct dmxdev_feed *feed, *tmp;
 534
 535         /* delete all PIDs */
 536         list_for_each_entry_safe(feed, tmp, &dmxdevfilter->feed.ts, next) {
 537                 list_del(&feed->next);
 538                 kfree(feed);
 539         }
 540
 541         BUG_ON(!list_empty(&dmxdevfilter->feed.ts));
 542 }
 543
 544 static inline int dvb_dmxdev_filter_reset(struct dmxdev_filter *dmxdevfilter)
 545 {
 546         if (dmxdevfilter->state < DMXDEV_STATE_SET)
 547                 return 0;
 548
 549         if (dmxdevfilter->type == DMXDEV_TYPE_PES)
 550                 dvb_dmxdev_delete_pids(dmxdevfilter);
 551
 552         dmxdevfilter->type = DMXDEV_TYPE_NONE;
 553         dvb_dmxdev_filter_state_set(dmxdevfilter, DMXDEV_STATE_ALLOCATED);
 554         return 0;
 555 }
 556
 557 static int dvb_dmxdev_start_feed(struct dmxdev *dmxdev,
 558                                  struct dmxdev_filter *filter,
 559                                  struct dmxdev_feed *feed)
 560 {
 561         struct timespec timeout = { 0 };
 562         struct dmx_pes_filter_params *para = &filter->params.pes;
 563         dmx_output_t otype;
 564         int ret;
 565         int ts_type;
 566         enum dmx_ts_pes ts_pes;
 567         struct dmx_ts_feed *tsfeed;
 568
 569         feed->ts = NULL;
 570         otype = para->output;
 571
 572         ts_pes = para->pes_type;
 573
 574         if (ts_pes < DMX_PES_OTHER)
 575                 ts_type = TS_DECODER;
 576         else
 577                 ts_type = 0;
 578
 579         if (otype == DMX_OUT_TS_TAP)
 580                 ts_type |= TS_PACKET;
 581         else if (otype == DMX_OUT_TSDEMUX_TAP)
 582                 ts_type |= TS_PACKET | TS_DEMUX;
 583         else if (otype == DMX_OUT_TAP)
 584                 ts_type |= TS_PACKET | TS_DEMUX | TS_PAYLOAD_ONLY;
 585
 586         ret = dmxdev->demux->allocate_ts_feed(dmxdev->demux, &feed->ts,
 587                                               dvb_dmxdev_ts_callback);
 588         if (ret < 0)
 589                 return ret;
 590
 591         tsfeed = feed->ts;
 592         tsfeed->priv = filter;
 593
 594         ret = tsfeed->set(tsfeed, feed->pid, ts_type, ts_pes, 32768, timeout);
 595         if (ret < 0) {
 596                 dmxdev->demux->release_ts_feed(dmxdev->demux, tsfeed);
 597                 return ret;
 598         }
 599
 600         ret = tsfeed->start_filtering(tsfeed);
 601         if (ret < 0) {
 602                 dmxdev->demux->release_ts_feed(dmxdev->demux, tsfeed);
 603                 return ret;
 604         }
 605
 606         return 0;
 607 }
 608
 609 static int dvb_dmxdev_filter_start(struct dmxdev_filter *filter)
 610 {
 611         struct dmxdev *dmxdev = filter->dev;
 612         struct dmxdev_feed *feed;
 613         void *mem;
 614         int ret, i;
 615
 616         if (filter->state < DMXDEV_STATE_SET)
 617                 return -EINVAL;
 618
 619         if (filter->state >= DMXDEV_STATE_GO)
 620                 dvb_dmxdev_filter_stop(filter);
 621
 622         if (!filter->buffer.data) {
 623                 mem = vmalloc(filter->buffer.size);
 624                 if (!mem)
 625                         return -ENOMEM;
 626                 spin_lock_irq(&filter->dev->lock);
 627                 filter->buffer.data = mem;
 628                 spin_unlock_irq(&filter->dev->lock);
 629         }
 630
 631         dvb_ringbuffer_flush(&filter->buffer);
 632
 633         switch (filter->type) {
 634         case DMXDEV_TYPE_SEC:
 635         {
 636                 struct dmx_sct_filter_params *para = &filter->params.sec;
 637                 struct dmx_section_filter **secfilter = &filter->filter.sec;
 638                 struct dmx_section_feed **secfeed = &filter->feed.sec;
 639
 640                 *secfilter = NULL;
 641                 *secfeed = NULL;
 642
 643
 644                 /* find active filter/feed with same PID */
 645                 for (i = 0; i < dmxdev->filternum; i++) {
 646                         if (dmxdev->filter[i].state >= DMXDEV_STATE_GO &&
 647                             dmxdev->filter[i].type == DMXDEV_TYPE_SEC &&
 648                             dmxdev->filter[i].params.sec.pid == para->pid) {
 649                                 *secfeed = dmxdev->filter[i].feed.sec;
 650                                 break;
 651                         }
 652                 }
 653
 654                 /* if no feed found, try to allocate new one */
 655                 if (!*secfeed) {
 656                         ret = dmxdev->demux->allocate_section_feed(dmxdev->demux,
 657                                                                    secfeed,
 658                                                                    dvb_dmxdev_section_callback);
 659                         if (ret < 0) {
 660                                 printk("DVB (%s): could not alloc feed\n",
 661                                        __func__);
 662                                 return ret;
 663                         }
 664
 665                         ret = (*secfeed)->set(*secfeed, para->pid, 32768,
 666                                               (para->flags & DMX_CHECK_CRC) ? 1 : 0);
 667                         if (ret < 0) {
 668                                 printk("DVB (%s): could not set feed\n",
 669                                        __func__);
 670                                 dvb_dmxdev_feed_restart(filter);
 671                                 return ret;
 672                         }
 673                 } else {
 674                         dvb_dmxdev_feed_stop(filter);
 675                 }
 676
 677                 ret = (*secfeed)->allocate_filter(*secfeed, secfilter);
 678                 if (ret < 0) {
 679                         dvb_dmxdev_feed_restart(filter);
 680                         filter->feed.sec->start_filtering(*secfeed);
 681                         dprintk("could not get filter\n");
 682                         return ret;
 683                 }
 684
 685                 (*secfilter)->priv = filter;
 686
 687                 memcpy(&((*secfilter)->filter_value[3]),
 688                        &(para->filter.filter[1]), DMX_FILTER_SIZE - 1);
 689                 memcpy(&(*secfilter)->filter_mask[3],
 690                        &para->filter.mask[1], DMX_FILTER_SIZE - 1);
 691                 memcpy(&(*secfilter)->filter_mode[3],
 692                        &para->filter.mode[1], DMX_FILTER_SIZE - 1);
 693
 694                 (*secfilter)->filter_value[0] = para->filter.filter[0];
 695                 (*secfilter)->filter_mask[0] = para->filter.mask[0];
 696                 (*secfilter)->filter_mode[0] = para->filter.mode[0];
 697                 (*secfilter)->filter_mask[1] = 0;
 698                 (*secfilter)->filter_mask[2] = 0;
 699
 700                 filter->todo = 0;
 701
 702                 ret = filter->feed.sec->start_filtering(filter->feed.sec);
 703                 if (ret < 0)
 704                         return ret;
 705
 706                 dvb_dmxdev_filter_timer(filter);
 707                 break;
 708         }
 709         case DMXDEV_TYPE_PES:
 710                 list_for_each_entry(feed, &filter->feed.ts, next) {
 711                         ret = dvb_dmxdev_start_feed(dmxdev, filter, feed);
 712                         if (ret < 0) {
 713                                 dvb_dmxdev_filter_stop(filter);
 714                                 return ret;
 715                         }
 716                 }
 717                 break;
 718         default:
 719                 return -EINVAL;
 720         }
 721
 722         dvb_dmxdev_filter_state_set(filter, DMXDEV_STATE_GO);
 723         return 0;
 724 }
 725
 726 static int dvb_demux_open(struct inode *inode, struct file *file)
 727 {
 728         struct dvb_device *dvbdev = file->private_data;
 729         struct dmxdev *dmxdev = dvbdev->priv;
 730         int i;
 731         struct dmxdev_filter *dmxdevfilter;
 732
 733         if (!dmxdev->filter)
 734                 return -EINVAL;
 735
 736         if (mutex_lock_interruptible(&dmxdev->mutex))
 737                 return -ERESTARTSYS;
 738
 739         for (i = 0; i < dmxdev->filternum; i++)
 740                 if (dmxdev->filter[i].state == DMXDEV_STATE_FREE)
 741                         break;
 742
 743         if (i == dmxdev->filternum) {
 744                 mutex_unlock(&dmxdev->mutex);
 745                 return -EMFILE;
 746         }
 747
 748         dmxdevfilter = &dmxdev->filter[i];
 749         mutex_init(&dmxdevfilter->mutex);
 750         file->private_data = dmxdevfilter;
 751
 752         dvb_ringbuffer_init(&dmxdevfilter->buffer, NULL, 8192);
 753         dmxdevfilter->type = DMXDEV_TYPE_NONE;
 754         dvb_dmxdev_filter_state_set(dmxdevfilter, DMXDEV_STATE_ALLOCATED);
 755         init_timer(&dmxdevfilter->timer);
 756
 757         dvbdev->users++;
 758
 759         mutex_unlock(&dmxdev->mutex);
 760         return 0;
 761 }
 762
 763 static int dvb_dmxdev_filter_free(struct dmxdev *dmxdev,
 764                                   struct dmxdev_filter *dmxdevfilter)
 765 {
 766         mutex_lock(&dmxdev->mutex);
 767         mutex_lock(&dmxdevfilter->mutex);
 768
 769         dvb_dmxdev_filter_stop(dmxdevfilter);
 770         dvb_dmxdev_filter_reset(dmxdevfilter);
 771
 772         if (dmxdevfilter->buffer.data) {
 773                 void *mem = dmxdevfilter->buffer.data;
 774
 775                 spin_lock_irq(&dmxdev->lock);
 776                 dmxdevfilter->buffer.data = NULL;
 777                 spin_unlock_irq(&dmxdev->lock);
 778                 vfree(mem);
 779         }
 780
 781         dvb_dmxdev_filter_state_set(dmxdevfilter, DMXDEV_STATE_FREE);
 782         wake_up(&dmxdevfilter->buffer.queue);
 783         mutex_unlock(&dmxdevfilter->mutex);
 784         mutex_unlock(&dmxdev->mutex);
 785         return 0;
 786 }
 787
 788 static inline void invert_mode(dmx_filter_t *filter)
 789 {
 790         int i;
 791
 792         for (i = 0; i < DMX_FILTER_SIZE; i++)
 793                 filter->mode[i] ^= 0xff;
 794 }
 795
 796 static int dvb_dmxdev_add_pid(struct dmxdev *dmxdev,
 797                               struct dmxdev_filter *filter, u16 pid)
 798 {
 799         struct dmxdev_feed *feed;
 800
 801         if ((filter->type != DMXDEV_TYPE_PES) ||
 802             (filter->state < DMXDEV_STATE_SET))
 803                 return -EINVAL;
 804
 805         /* only TS packet filters may have multiple PIDs */
 806         if ((filter->params.pes.output != DMX_OUT_TSDEMUX_TAP) &&
 807             (!list_empty(&filter->feed.ts)))
 808                 return -EINVAL;
 809
 810         feed = kzalloc(sizeof(struct dmxdev_feed), GFP_KERNEL);
 811         if (feed == NULL)
 812                 return -ENOMEM;
 813
 814         feed->pid = pid;
 815         list_add(&feed->next, &filter->feed.ts);
 816
 817         if (filter->state >= DMXDEV_STATE_GO)
 818                 return dvb_dmxdev_start_feed(dmxdev, filter, feed);
 819
 820         return 0;
 821 }
 822
 823 static int dvb_dmxdev_remove_pid(struct dmxdev *dmxdev,
 824                                   struct dmxdev_filter *filter, u16 pid)
 825 {
 826         struct dmxdev_feed *feed, *tmp;
 827
 828         if ((filter->type != DMXDEV_TYPE_PES) ||
 829             (filter->state < DMXDEV_STATE_SET))
 830                 return -EINVAL;
 831
 832         list_for_each_entry_safe(feed, tmp, &filter->feed.ts, next) {
 833                 if ((feed->pid == pid) && (feed->ts != NULL)) {
 834                         feed->ts->stop_filtering(feed->ts);
 835                         filter->dev->demux->release_ts_feed(filter->dev->demux,
 836                                                             feed->ts);
 837                         list_del(&feed->next);
 838                         kfree(feed);
 839                 }
 840         }
 841
 842         return 0;
 843 }
 844
 845 static int dvb_dmxdev_filter_set(struct dmxdev *dmxdev,
 846                                  struct dmxdev_filter *dmxdevfilter,
 847                                  struct dmx_sct_filter_params *params)
 848 {
 849         dprintk("function : %s, PID=0x%04x, flags=%02x, timeout=%d\n",
 850                 __func__, params->pid, params->flags, params->timeout);
 851
 852         dvb_dmxdev_filter_stop(dmxdevfilter);
 853
 854         dmxdevfilter->type = DMXDEV_TYPE_SEC;
 855         memcpy(&dmxdevfilter->params.sec,
 856                params, sizeof(struct dmx_sct_filter_params));
 857         invert_mode(&dmxdevfilter->params.sec.filter);
 858         dvb_dmxdev_filter_state_set(dmxdevfilter, DMXDEV_STATE_SET);
 859
 860         if (params->flags & DMX_IMMEDIATE_START)
 861                 return dvb_dmxdev_filter_start(dmxdevfilter);
 862
 863         return 0;
 864 }
 865
 866 static int dvb_dmxdev_pes_filter_set(struct dmxdev *dmxdev,
 867                                      struct dmxdev_filter *dmxdevfilter,
 868                                      struct dmx_pes_filter_params *params)
 869 {
 870         int ret;
 871
 872         dvb_dmxdev_filter_stop(dmxdevfilter);
 873         dvb_dmxdev_filter_reset(dmxdevfilter);
 874
 875         if ((unsigned)params->pes_type > DMX_PES_OTHER)
 876                 return -EINVAL;
 877
 878         dmxdevfilter->type = DMXDEV_TYPE_PES;
 879         memcpy(&dmxdevfilter->params, params,
 880                sizeof(struct dmx_pes_filter_params));
 881         INIT_LIST_HEAD(&dmxdevfilter->feed.ts);
 882
 883         dvb_dmxdev_filter_state_set(dmxdevfilter, DMXDEV_STATE_SET);
 884
 885         ret = dvb_dmxdev_add_pid(dmxdev, dmxdevfilter,
 886                                  dmxdevfilter->params.pes.pid);
 887         if (ret < 0)
 888                 return ret;
 889
 890         if (params->flags & DMX_IMMEDIATE_START)
 891                 return dvb_dmxdev_filter_start(dmxdevfilter);
 892
 893         return 0;
 894 }
 895
 896 static ssize_t dvb_dmxdev_read_sec(struct dmxdev_filter *dfil,
 897                                    struct file *file, char __user *buf,
 898                                    size_t count, loff_t *ppos)
 899 {
 900         int result, hcount;
 901         int done = 0;
 902
 903         if (dfil->todo <= 0) {
 904                 hcount = 3 + dfil->todo;
 905                 if (hcount > count)
 906                         hcount = count;
 907                 result = dvb_dmxdev_buffer_read(&dfil->buffer,
 908                                                 file->f_flags & O_NONBLOCK,
 909                                                 buf, hcount, ppos);
 910                 if (result < 0) {
 911                         dfil->todo = 0;
 912                         return result;
 913                 }
 914                 if (copy_from_user(dfil->secheader - dfil->todo, buf, result))
 915                         return -EFAULT;
 916                 buf += result;
 917                 done = result;
 918                 count -= result;
 919                 dfil->todo -= result;
 920                 if (dfil->todo > -3)
 921                         return done;
 922                 dfil->todo = ((dfil->secheader[1] << 8) | dfil->secheader[2]) & 0xfff;
 923                 if (!count)
 924                         return done;
 925         }
 926         if (count > dfil->todo)
 927                 count = dfil->todo;
 928         result = dvb_dmxdev_buffer_read(&dfil->buffer,
 929                                         file->f_flags & O_NONBLOCK,
 930                                         buf, count, ppos);
 931         if (result < 0)
 932                 return result;
 933         dfil->todo -= result;
 934         return (result + done);
 935 }
 936
 937 static ssize_t
 938 dvb_demux_read(struct file *file, char __user *buf, size_t count,
 939                loff_t *ppos)
 940 {
 941         struct dmxdev_filter *dmxdevfilter = file->private_data;
 942         int ret;
 943
 944         if (mutex_lock_interruptible(&dmxdevfilter->mutex))
 945                 return -ERESTARTSYS;
 946
 947         if (dmxdevfilter->type == DMXDEV_TYPE_SEC)
 948                 ret = dvb_dmxdev_read_sec(dmxdevfilter, file, buf, count, ppos);
 949         else
 950                 ret = dvb_dmxdev_buffer_read(&dmxdevfilter->buffer,
 951                                              file->f_flags & O_NONBLOCK,
 952                                              buf, count, ppos);
 953
 954         mutex_unlock(&dmxdevfilter->mutex);
 955         return ret;
 956 }
 957
 958 static int dvb_demux_do_ioctl(struct file *file,
 959                               unsigned int cmd, void *parg)
 960 {
 961         struct dmxdev_filter *dmxdevfilter = file->private_data;
 962         struct dmxdev *dmxdev = dmxdevfilter->dev;
 963         unsigned long arg = (unsigned long)parg;
 964         int ret = 0;
 965
 966         if (mutex_lock_interruptible(&dmxdev->mutex))
 967                 return -ERESTARTSYS;
 968
 969         switch (cmd) {
 970         case DMX_START:
 971                 if (mutex_lock_interruptible(&dmxdevfilter->mutex)) {
 972                         mutex_unlock(&dmxdev->mutex);
 973                         return -ERESTARTSYS;
 974                 }
 975                 if (dmxdevfilter->state < DMXDEV_STATE_SET)
 976                         ret = -EINVAL;
 977                 else
 978                         ret = dvb_dmxdev_filter_start(dmxdevfilter);
 979                 mutex_unlock(&dmxdevfilter->mutex);
 980                 break;
 981
 982         case DMX_STOP:
 983                 if (mutex_lock_interruptible(&dmxdevfilter->mutex)) {
 984                         mutex_unlock(&dmxdev->mutex);
 985                         return -ERESTARTSYS;
 986                 }
 987                 ret = dvb_dmxdev_filter_stop(dmxdevfilter);
 988                 mutex_unlock(&dmxdevfilter->mutex);
 989                 break;
 990
 991         case DMX_SET_FILTER:
 992                 if (mutex_lock_interruptible(&dmxdevfilter->mutex)) {
 993                         mutex_unlock(&dmxdev->mutex);
 994                         return -ERESTARTSYS;
 995                 }
 996                 ret = dvb_dmxdev_filter_set(dmxdev, dmxdevfilter, parg);
 997                 mutex_unlock(&dmxdevfilter->mutex);
 998                 break;
 999
1000         case DMX_SET_PES_FILTER:
1001                 if (mutex_lock_interruptible(&dmxdevfilter->mutex)) {
1002                         mutex_unlock(&dmxdev->mutex);
1003                         return -ERESTARTSYS;
1004                 }
1005                 ret = dvb_dmxdev_pes_filter_set(dmxdev, dmxdevfilter, parg);
1006                 mutex_unlock(&dmxdevfilter->mutex);
1007                 break;
1008
1009         case DMX_SET_BUFFER_SIZE:
1010                 if (mutex_lock_interruptible(&dmxdevfilter->mutex)) {
1011                         mutex_unlock(&dmxdev->mutex);
1012                         return -ERESTARTSYS;
1013                 }
1014                 ret = dvb_dmxdev_set_buffer_size(dmxdevfilter, arg);
1015                 mutex_unlock(&dmxdevfilter->mutex);
1016                 break;
1017
1018         case DMX_GET_PES_PIDS:
1019                 if (!dmxdev->demux->get_pes_pids) {
1020                         ret = -EINVAL;
1021                         break;
1022                 }
1023                 dmxdev->demux->get_pes_pids(dmxdev->demux, parg);
1024                 break;
1025
1026         case DMX_GET_CAPS:
1027                 if (!dmxdev->demux->get_caps) {
1028                         ret = -EINVAL;
1029                         break;
1030                 }
1031                 ret = dmxdev->demux->get_caps(dmxdev->demux, parg);
1032                 break;
1033
1034         case DMX_SET_SOURCE:
1035                 if (!dmxdev->demux->set_source) {
1036                         ret = -EINVAL;
1037                         break;
1038                 }
1039                 ret = dmxdev->demux->set_source(dmxdev->demux, parg);
1040                 break;
1041
1042         case DMX_GET_STC:
1043                 if (!dmxdev->demux->get_stc) {
1044                         ret = -EINVAL;
1045                         break;
1046                 }
1047                 ret = dmxdev->demux->get_stc(dmxdev->demux,
1048                                              ((struct dmx_stc *)parg)->num,
1049                                              &((struct dmx_stc *)parg)->stc,
1050                                              &((struct dmx_stc *)parg)->base);
1051                 break;
1052
1053         case DMX_ADD_PID:
1054                 if (mutex_lock_interruptible(&dmxdevfilter->mutex)) {
1055                         ret = -ERESTARTSYS;
1056                         break;
1057                 }
1058                 ret = dvb_dmxdev_add_pid(dmxdev, dmxdevfilter, *(u16 *)parg);
1059                 mutex_unlock(&dmxdevfilter->mutex);
1060                 break;
1061
1062         case DMX_REMOVE_PID:
1063                 if (mutex_lock_interruptible(&dmxdevfilter->mutex)) {
1064                         ret = -ERESTARTSYS;
1065                         break;
1066                 }
1067                 ret = dvb_dmxdev_remove_pid(dmxdev, dmxdevfilter, *(u16 *)parg);
1068                 mutex_unlock(&dmxdevfilter->mutex);
1069                 break;
1070
1071         default:
1072                 ret = -EINVAL;
1073                 break;
1074         }
1075         mutex_unlock(&dmxdev->mutex);
1076         return ret;
1077 }
1078
1079 static long dvb_demux_ioctl(struct file *file, unsigned int cmd,
1080                             unsigned long arg)
1081 {
1082         return dvb_usercopy(file, cmd, arg, dvb_demux_do_ioctl);
1083 }
1084
1085 static unsigned int dvb_demux_poll(struct file *file, poll_table *wait)
1086 {
1087         struct dmxdev_filter *dmxdevfilter = file->private_data;
1088         unsigned int mask = 0;
1089
1090         if ((!dmxdevfilter) || dmxdevfilter->dev->exit)
1091                 return POLLERR;
1092
1093         poll_wait(file, &dmxdevfilter->buffer.queue, wait);
1094
1095         if (dmxdevfilter->state != DMXDEV_STATE_GO &&
1096             dmxdevfilter->state != DMXDEV_STATE_DONE &&
1097             dmxdevfilter->state != DMXDEV_STATE_TIMEDOUT)
1098                 return 0;
1099
1100         if (dmxdevfilter->buffer.error)
1101                 mask |= (POLLIN | POLLRDNORM | POLLPRI | POLLERR);
1102
1103         if (!dvb_ringbuffer_empty(&dmxdevfilter->buffer))
1104                 mask |= (POLLIN | POLLRDNORM | POLLPRI);
1105
1106         return mask;
1107 }
1108
1109 static int dvb_demux_release(struct inode *inode, struct file *file)
1110 {
1111         struct dmxdev_filter *dmxdevfilter = file->private_data;
1112         struct dmxdev *dmxdev = dmxdevfilter->dev;
1113
1114         int ret;
1115
1116         ret = dvb_dmxdev_filter_free(dmxdev, dmxdevfilter);
1117
1118         mutex_lock(&dmxdev->mutex);
1119         dmxdev->dvbdev->users--;
1120         if(dmxdev->dvbdev->users==1 && dmxdev->exit==1) {
1121                 mutex_unlock(&dmxdev->mutex);
1122                 wake_up(&dmxdev->dvbdev->wait_queue);
1123         } else
1124                 mutex_unlock(&dmxdev->mutex);
1125
1126         return ret;
1127 }
1128
1129 static const struct file_operations dvb_demux_fops = {
1130         .owner = THIS_MODULE,
1131         .read = dvb_demux_read,
1132         .unlocked_ioctl = dvb_demux_ioctl,
1133         .open = dvb_demux_open,
1134         .release = dvb_demux_release,
1135         .poll = dvb_demux_poll,
1136         .llseek = default_llseek,
1137 };
1138
1139 static const struct dvb_device dvbdev_demux = {
1140         .priv = NULL,
1141         .users = 1,
1142         .writers = 1,
1143 #if defined(CONFIG_MEDIA_CONTROLLER_DVB)
1144         .name = "dvb-demux",
1145 #endif
1146         .fops = &dvb_demux_fops
1147 };
1148
1149 static int dvb_dvr_do_ioctl(struct file *file,
1150                             unsigned int cmd, void *parg)
1151 {
1152         struct dvb_device *dvbdev = file->private_data;
1153         struct dmxdev *dmxdev = dvbdev->priv;
1154         unsigned long arg = (unsigned long)parg;
1155         int ret;
1156
1157         if (mutex_lock_interruptible(&dmxdev->mutex))
1158                 return -ERESTARTSYS;
1159
1160         switch (cmd) {
1161         case DMX_SET_BUFFER_SIZE:
1162                 ret = dvb_dvr_set_buffer_size(dmxdev, arg);
1163                 break;
1164
1165         default:
1166                 ret = -EINVAL;
1167                 break;
1168         }
1169         mutex_unlock(&dmxdev->mutex);
1170         return ret;
1171 }
1172
1173 static long dvb_dvr_ioctl(struct file *file,
1174                          unsigned int cmd, unsigned long arg)
1175 {
1176         return dvb_usercopy(file, cmd, arg, dvb_dvr_do_ioctl);
1177 }
1178
1179 static unsigned int dvb_dvr_poll(struct file *file, poll_table *wait)
1180 {
1181         struct dvb_device *dvbdev = file->private_data;
1182         struct dmxdev *dmxdev = dvbdev->priv;
1183         unsigned int mask = 0;
1184
1185         dprintk("function : %s\n", __func__);
1186
1187         if (dmxdev->exit)
1188                 return POLLERR;
1189
1190         poll_wait(file, &dmxdev->dvr_buffer.queue, wait);
1191
1192         if ((file->f_flags & O_ACCMODE) == O_RDONLY) {
1193                 if (dmxdev->dvr_buffer.error)
1194                         mask |= (POLLIN | POLLRDNORM | POLLPRI | POLLERR);
1195
1196                 if (!dvb_ringbuffer_empty(&dmxdev->dvr_buffer))
1197                         mask |= (POLLIN | POLLRDNORM | POLLPRI);
1198         } else
1199                 mask |= (POLLOUT | POLLWRNORM | POLLPRI);
1200
1201         return mask;
1202 }
1203
1204 static const struct file_operations dvb_dvr_fops = {
1205         .owner = THIS_MODULE,
1206         .read = dvb_dvr_read,
1207         .write = dvb_dvr_write,
1208         .unlocked_ioctl = dvb_dvr_ioctl,
1209         .open = dvb_dvr_open,
1210         .release = dvb_dvr_release,
1211         .poll = dvb_dvr_poll,
1212         .llseek = default_llseek,
1213 };
1214
1215 static const struct dvb_device dvbdev_dvr = {
1216         .priv = NULL,
1217         .readers = 1,
1218         .users = 1,
1219 #if defined(CONFIG_MEDIA_CONTROLLER_DVB)
1220         .name = "dvb-dvr",
1221 #endif
1222         .fops = &dvb_dvr_fops
1223 };
1224 int dvb_dmxdev_init(struct dmxdev *dmxdev, struct dvb_adapter *dvb_adapter)
1225 {
1226         int i;
1227
1228         if (dmxdev->demux->open(dmxdev->demux) < 0)
1229                 return -EUSERS;
1230
1231         dmxdev->filter = vmalloc(dmxdev->filternum * sizeof(struct dmxdev_filter));
1232         if (!dmxdev->filter)
1233                 return -ENOMEM;
1234
1235         mutex_init(&dmxdev->mutex);
1236         spin_lock_init(&dmxdev->lock);
1237         for (i = 0; i < dmxdev->filternum; i++) {
1238                 dmxdev->filter[i].dev = dmxdev;
1239                 dmxdev->filter[i].buffer.data = NULL;
1240                 dvb_dmxdev_filter_state_set(&dmxdev->filter[i],
1241                                             DMXDEV_STATE_FREE);
1242         }
1243
1244         dvb_register_device(dvb_adapter, &dmxdev->dvbdev, &dvbdev_demux, dmxdev,
1245                             DVB_DEVICE_DEMUX);
1246         dvb_register_device(dvb_adapter, &dmxdev->dvr_dvbdev, &dvbdev_dvr,
1247                             dmxdev, DVB_DEVICE_DVR);
1248
1249         dvb_ringbuffer_init(&dmxdev->dvr_buffer, NULL, 8192);
1250
1251         return 0;
1252 }
1253
1254 EXPORT_SYMBOL(dvb_dmxdev_init);
1255
1256 void dvb_dmxdev_release(struct dmxdev *dmxdev)
1257 {
1258         dmxdev->exit=1;
1259         if (dmxdev->dvbdev->users > 1) {
1260                 wait_event(dmxdev->dvbdev->wait_queue,
1261                                 dmxdev->dvbdev->users==1);
1262         }
1263         if (dmxdev->dvr_dvbdev->users > 1) {
1264                 wait_event(dmxdev->dvr_dvbdev->wait_queue,
1265                                 dmxdev->dvr_dvbdev->users==1);
1266         }
1267
1268         dvb_unregister_device(dmxdev->dvbdev);
1269         dvb_unregister_device(dmxdev->dvr_dvbdev);
1270
1271         vfree(dmxdev->filter);
1272         dmxdev->filter = NULL;
1273         dmxdev->demux->close(dmxdev->demux);
1274 }
1275
1276 EXPORT_SYMBOL(dvb_dmxdev_release);