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