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 {
 357         struct dmxdev_filter *dmxdevfilter = filter->priv;
 358         int ret;
 359
 360         if (dmxdevfilter->buffer.error) {
 361                 wake_up(&dmxdevfilter->buffer.queue);
 362                 return 0;
 363         }
 364         spin_lock(&dmxdevfilter->dev->lock);
 365         if (dmxdevfilter->state != DMXDEV_STATE_GO) {
 366                 spin_unlock(&dmxdevfilter->dev->lock);
 367                 return 0;
 368         }
 369         del_timer(&dmxdevfilter->timer);
 370         dprintk("dmxdev: section callback %*ph\n", 6, buffer1);
 371         ret = dvb_dmxdev_buffer_write(&dmxdevfilter->buffer, buffer1,
 372                                       buffer1_len);
 373         if (ret == buffer1_len) {
 374                 ret = dvb_dmxdev_buffer_write(&dmxdevfilter->buffer, buffer2,
 375                                               buffer2_len);
 376         }
 377         if (ret < 0)
 378                 dmxdevfilter->buffer.error = ret;
 379         if (dmxdevfilter->params.sec.flags & DMX_ONESHOT)
 380                 dmxdevfilter->state = DMXDEV_STATE_DONE;
 381         spin_unlock(&dmxdevfilter->dev->lock);
 382         wake_up(&dmxdevfilter->buffer.queue);
 383         return 0;
 384 }
 385
 386 static int dvb_dmxdev_ts_callback(const u8 *buffer1, size_t buffer1_len,
 387                                   const u8 *buffer2, size_t buffer2_len,
 388                                   struct dmx_ts_feed *feed)
 389 {
 390         struct dmxdev_filter *dmxdevfilter = feed->priv;
 391         struct dvb_ringbuffer *buffer;
 392         int ret;
 393
 394         spin_lock(&dmxdevfilter->dev->lock);
 395         if (dmxdevfilter->params.pes.output == DMX_OUT_DECODER) {
 396                 spin_unlock(&dmxdevfilter->dev->lock);
 397                 return 0;
 398         }
 399
 400         if (dmxdevfilter->params.pes.output == DMX_OUT_TAP
 401             || dmxdevfilter->params.pes.output == DMX_OUT_TSDEMUX_TAP)
 402                 buffer = &dmxdevfilter->buffer;
 403         else
 404                 buffer = &dmxdevfilter->dev->dvr_buffer;
 405         if (buffer->error) {
 406                 spin_unlock(&dmxdevfilter->dev->lock);
 407                 wake_up(&buffer->queue);
 408                 return 0;
 409         }
 410         ret = dvb_dmxdev_buffer_write(buffer, buffer1, buffer1_len);
 411         if (ret == buffer1_len)
 412                 ret = dvb_dmxdev_buffer_write(buffer, buffer2, buffer2_len);
 413         if (ret < 0)
 414                 buffer->error = ret;
 415         spin_unlock(&dmxdevfilter->dev->lock);
 416         wake_up(&buffer->queue);
 417         return 0;
 418 }
 419
 420 /* stop feed but only mark the specified filter as stopped (state set) */
 421 static int dvb_dmxdev_feed_stop(struct dmxdev_filter *dmxdevfilter)
 422 {
 423         struct dmxdev_feed *feed;
 424
 425         dvb_dmxdev_filter_state_set(dmxdevfilter, DMXDEV_STATE_SET);
 426
 427         switch (dmxdevfilter->type) {
 428         case DMXDEV_TYPE_SEC:
 429                 del_timer(&dmxdevfilter->timer);
 430                 dmxdevfilter->feed.sec->stop_filtering(dmxdevfilter->feed.sec);
 431                 break;
 432         case DMXDEV_TYPE_PES:
 433                 list_for_each_entry(feed, &dmxdevfilter->feed.ts, next)
 434                         feed->ts->stop_filtering(feed->ts);
 435                 break;
 436         default:
 437                 return -EINVAL;
 438         }
 439         return 0;
 440 }
 441
 442 /* start feed associated with the specified filter */
 443 static int dvb_dmxdev_feed_start(struct dmxdev_filter *filter)
 444 {
 445         struct dmxdev_feed *feed;
 446         int ret;
 447
 448         dvb_dmxdev_filter_state_set(filter, DMXDEV_STATE_GO);
 449
 450         switch (filter->type) {
 451         case DMXDEV_TYPE_SEC:
 452                 return filter->feed.sec->start_filtering(filter->feed.sec);
 453         case DMXDEV_TYPE_PES:
 454                 list_for_each_entry(feed, &filter->feed.ts, next) {
 455                         ret = feed->ts->start_filtering(feed->ts);
 456                         if (ret < 0) {
 457                                 dvb_dmxdev_feed_stop(filter);
 458                                 return ret;
 459                         }
 460                 }
 461                 break;
 462         default:
 463                 return -EINVAL;
 464         }
 465
 466         return 0;
 467 }
 468
 469 /* restart section feed if it has filters left associated with it,
 470    otherwise release the feed */
 471 static int dvb_dmxdev_feed_restart(struct dmxdev_filter *filter)
 472 {
 473         int i;
 474         struct dmxdev *dmxdev = filter->dev;
 475         u16 pid = filter->params.sec.pid;
 476
 477         for (i = 0; i < dmxdev->filternum; i++)
 478                 if (dmxdev->filter[i].state >= DMXDEV_STATE_GO &&
 479                     dmxdev->filter[i].type == DMXDEV_TYPE_SEC &&
 480                     dmxdev->filter[i].params.sec.pid == pid) {
 481                         dvb_dmxdev_feed_start(&dmxdev->filter[i]);
 482                         return 0;
 483                 }
 484
 485         filter->dev->demux->release_section_feed(dmxdev->demux,
 486                                                  filter->feed.sec);
 487
 488         return 0;
 489 }
 490
 491 static int dvb_dmxdev_filter_stop(struct dmxdev_filter *dmxdevfilter)
 492 {
 493         struct dmxdev_feed *feed;
 494         struct dmx_demux *demux;
 495
 496         if (dmxdevfilter->state < DMXDEV_STATE_GO)
 497                 return 0;
 498
 499         switch (dmxdevfilter->type) {
 500         case DMXDEV_TYPE_SEC:
 501                 if (!dmxdevfilter->feed.sec)
 502                         break;
 503                 dvb_dmxdev_feed_stop(dmxdevfilter);
 504                 if (dmxdevfilter->filter.sec)
 505                         dmxdevfilter->feed.sec->
 506                             release_filter(dmxdevfilter->feed.sec,
 507                                            dmxdevfilter->filter.sec);
 508                 dvb_dmxdev_feed_restart(dmxdevfilter);
 509                 dmxdevfilter->feed.sec = NULL;
 510                 break;
 511         case DMXDEV_TYPE_PES:
 512                 dvb_dmxdev_feed_stop(dmxdevfilter);
 513                 demux = dmxdevfilter->dev->demux;
 514                 list_for_each_entry(feed, &dmxdevfilter->feed.ts, next) {
 515                         demux->release_ts_feed(demux, feed->ts);
 516                         feed->ts = NULL;
 517                 }
 518                 break;
 519         default:
 520                 if (dmxdevfilter->state == DMXDEV_STATE_ALLOCATED)
 521                         return 0;
 522                 return -EINVAL;
 523         }
 524
 525         dvb_ringbuffer_flush(&dmxdevfilter->buffer);
 526         return 0;
 527 }
 528
 529 static void dvb_dmxdev_delete_pids(struct dmxdev_filter *dmxdevfilter)
 530 {
 531         struct dmxdev_feed *feed, *tmp;
 532
 533         /* delete all PIDs */
 534         list_for_each_entry_safe(feed, tmp, &dmxdevfilter->feed.ts, next) {
 535                 list_del(&feed->next);
 536                 kfree(feed);
 537         }
 538
 539         BUG_ON(!list_empty(&dmxdevfilter->feed.ts));
 540 }
 541
 542 static inline int dvb_dmxdev_filter_reset(struct dmxdev_filter *dmxdevfilter)
 543 {
 544         if (dmxdevfilter->state < DMXDEV_STATE_SET)
 545                 return 0;
 546
 547         if (dmxdevfilter->type == DMXDEV_TYPE_PES)
 548                 dvb_dmxdev_delete_pids(dmxdevfilter);
 549
 550         dmxdevfilter->type = DMXDEV_TYPE_NONE;
 551         dvb_dmxdev_filter_state_set(dmxdevfilter, DMXDEV_STATE_ALLOCATED);
 552         return 0;
 553 }
 554
 555 static int dvb_dmxdev_start_feed(struct dmxdev *dmxdev,
 556                                  struct dmxdev_filter *filter,
 557                                  struct dmxdev_feed *feed)
 558 {
 559         struct timespec timeout = { 0 };
 560         struct dmx_pes_filter_params *para = &filter->params.pes;
 561         dmx_output_t otype;
 562         int ret;
 563         int ts_type;
 564         enum dmx_ts_pes ts_pes;
 565         struct dmx_ts_feed *tsfeed;
 566
 567         feed->ts = NULL;
 568         otype = para->output;
 569
 570         ts_pes = para->pes_type;
 571
 572         if (ts_pes < DMX_PES_OTHER)
 573                 ts_type = TS_DECODER;
 574         else
 575                 ts_type = 0;
 576
 577         if (otype == DMX_OUT_TS_TAP)
 578                 ts_type |= TS_PACKET;
 579         else if (otype == DMX_OUT_TSDEMUX_TAP)
 580                 ts_type |= TS_PACKET | TS_DEMUX;
 581         else if (otype == DMX_OUT_TAP)
 582                 ts_type |= TS_PACKET | TS_DEMUX | TS_PAYLOAD_ONLY;
 583
 584         ret = dmxdev->demux->allocate_ts_feed(dmxdev->demux, &feed->ts,
 585                                               dvb_dmxdev_ts_callback);
 586         if (ret < 0)
 587                 return ret;
 588
 589         tsfeed = feed->ts;
 590         tsfeed->priv = filter;
 591
 592         ret = tsfeed->set(tsfeed, feed->pid, ts_type, ts_pes, 32768, timeout);
 593         if (ret < 0) {
 594                 dmxdev->demux->release_ts_feed(dmxdev->demux, tsfeed);
 595                 return ret;
 596         }
 597
 598         ret = tsfeed->start_filtering(tsfeed);
 599         if (ret < 0) {
 600                 dmxdev->demux->release_ts_feed(dmxdev->demux, tsfeed);
 601                 return ret;
 602         }
 603
 604         return 0;
 605 }
 606
 607 static int dvb_dmxdev_filter_start(struct dmxdev_filter *filter)
 608 {
 609         struct dmxdev *dmxdev = filter->dev;
 610         struct dmxdev_feed *feed;
 611         void *mem;
 612         int ret, i;
 613
 614         if (filter->state < DMXDEV_STATE_SET)
 615                 return -EINVAL;
 616
 617         if (filter->state >= DMXDEV_STATE_GO)
 618                 dvb_dmxdev_filter_stop(filter);
 619
 620         if (!filter->buffer.data) {
 621                 mem = vmalloc(filter->buffer.size);
 622                 if (!mem)
 623                         return -ENOMEM;
 624                 spin_lock_irq(&filter->dev->lock);
 625                 filter->buffer.data = mem;
 626                 spin_unlock_irq(&filter->dev->lock);
 627         }
 628
 629         dvb_ringbuffer_flush(&filter->buffer);
 630
 631         switch (filter->type) {
 632         case DMXDEV_TYPE_SEC:
 633         {
 634                 struct dmx_sct_filter_params *para = &filter->params.sec;
 635                 struct dmx_section_filter **secfilter = &filter->filter.sec;
 636                 struct dmx_section_feed **secfeed = &filter->feed.sec;
 637
 638                 *secfilter = NULL;
 639                 *secfeed = NULL;
 640
 641
 642                 /* find active filter/feed with same PID */
 643                 for (i = 0; i < dmxdev->filternum; i++) {
 644                         if (dmxdev->filter[i].state >= DMXDEV_STATE_GO &&
 645                             dmxdev->filter[i].type == DMXDEV_TYPE_SEC &&
 646                             dmxdev->filter[i].params.sec.pid == para->pid) {
 647                                 *secfeed = dmxdev->filter[i].feed.sec;
 648                                 break;
 649                         }
 650                 }
 651
 652                 /* if no feed found, try to allocate new one */
 653                 if (!*secfeed) {
 654                         ret = dmxdev->demux->allocate_section_feed(dmxdev->demux,
 655                                                                    secfeed,
 656                                                                    dvb_dmxdev_section_callback);
 657                         if (ret < 0) {
 658                                 printk("DVB (%s): could not alloc feed\n",
 659                                        __func__);
 660                                 return ret;
 661                         }
 662
 663                         ret = (*secfeed)->set(*secfeed, para->pid, 32768,
 664                                               (para->flags & DMX_CHECK_CRC) ? 1 : 0);
 665                         if (ret < 0) {
 666                                 printk("DVB (%s): could not set feed\n",
 667                                        __func__);
 668                                 dvb_dmxdev_feed_restart(filter);
 669                                 return ret;
 670                         }
 671                 } else {
 672                         dvb_dmxdev_feed_stop(filter);
 673                 }
 674
 675                 ret = (*secfeed)->allocate_filter(*secfeed, secfilter);
 676                 if (ret < 0) {
 677                         dvb_dmxdev_feed_restart(filter);
 678                         filter->feed.sec->start_filtering(*secfeed);
 679                         dprintk("could not get filter\n");
 680                         return ret;
 681                 }
 682
 683                 (*secfilter)->priv = filter;
 684
 685                 memcpy(&((*secfilter)->filter_value[3]),
 686                        &(para->filter.filter[1]), DMX_FILTER_SIZE - 1);
 687                 memcpy(&(*secfilter)->filter_mask[3],
 688                        &para->filter.mask[1], DMX_FILTER_SIZE - 1);
 689                 memcpy(&(*secfilter)->filter_mode[3],
 690                        &para->filter.mode[1], DMX_FILTER_SIZE - 1);
 691
 692                 (*secfilter)->filter_value[0] = para->filter.filter[0];
 693                 (*secfilter)->filter_mask[0] = para->filter.mask[0];
 694                 (*secfilter)->filter_mode[0] = para->filter.mode[0];
 695                 (*secfilter)->filter_mask[1] = 0;
 696                 (*secfilter)->filter_mask[2] = 0;
 697
 698                 filter->todo = 0;
 699
 700                 ret = filter->feed.sec->start_filtering(filter->feed.sec);
 701                 if (ret < 0)
 702                         return ret;
 703
 704                 dvb_dmxdev_filter_timer(filter);
 705                 break;
 706         }
 707         case DMXDEV_TYPE_PES:
 708                 list_for_each_entry(feed, &filter->feed.ts, next) {
 709                         ret = dvb_dmxdev_start_feed(dmxdev, filter, feed);
 710                         if (ret < 0) {
 711                                 dvb_dmxdev_filter_stop(filter);
 712                                 return ret;
 713                         }
 714                 }
 715                 break;
 716         default:
 717                 return -EINVAL;
 718         }
 719
 720         dvb_dmxdev_filter_state_set(filter, DMXDEV_STATE_GO);
 721         return 0;
 722 }
 723
 724 static int dvb_demux_open(struct inode *inode, struct file *file)
 725 {
 726         struct dvb_device *dvbdev = file->private_data;
 727         struct dmxdev *dmxdev = dvbdev->priv;
 728         int i;
 729         struct dmxdev_filter *dmxdevfilter;
 730
 731         if (!dmxdev->filter)
 732                 return -EINVAL;
 733
 734         if (mutex_lock_interruptible(&dmxdev->mutex))
 735                 return -ERESTARTSYS;
 736
 737         for (i = 0; i < dmxdev->filternum; i++)
 738                 if (dmxdev->filter[i].state == DMXDEV_STATE_FREE)
 739                         break;
 740
 741         if (i == dmxdev->filternum) {
 742                 mutex_unlock(&dmxdev->mutex);
 743                 return -EMFILE;
 744         }
 745
 746         dmxdevfilter = &dmxdev->filter[i];
 747         mutex_init(&dmxdevfilter->mutex);
 748         file->private_data = dmxdevfilter;
 749
 750         dvb_ringbuffer_init(&dmxdevfilter->buffer, NULL, 8192);
 751         dmxdevfilter->type = DMXDEV_TYPE_NONE;
 752         dvb_dmxdev_filter_state_set(dmxdevfilter, DMXDEV_STATE_ALLOCATED);
 753         init_timer(&dmxdevfilter->timer);
 754
 755         dvbdev->users++;
 756
 757         mutex_unlock(&dmxdev->mutex);
 758         return 0;
 759 }
 760
 761 static int dvb_dmxdev_filter_free(struct dmxdev *dmxdev,
 762                                   struct dmxdev_filter *dmxdevfilter)
 763 {
 764         mutex_lock(&dmxdev->mutex);
 765         mutex_lock(&dmxdevfilter->mutex);
 766
 767         dvb_dmxdev_filter_stop(dmxdevfilter);
 768         dvb_dmxdev_filter_reset(dmxdevfilter);
 769
 770         if (dmxdevfilter->buffer.data) {
 771                 void *mem = dmxdevfilter->buffer.data;
 772
 773                 spin_lock_irq(&dmxdev->lock);
 774                 dmxdevfilter->buffer.data = NULL;
 775                 spin_unlock_irq(&dmxdev->lock);
 776                 vfree(mem);
 777         }
 778
 779         dvb_dmxdev_filter_state_set(dmxdevfilter, DMXDEV_STATE_FREE);
 780         wake_up(&dmxdevfilter->buffer.queue);
 781         mutex_unlock(&dmxdevfilter->mutex);
 782         mutex_unlock(&dmxdev->mutex);
 783         return 0;
 784 }
 785
 786 static inline void invert_mode(dmx_filter_t *filter)
 787 {
 788         int i;
 789
 790         for (i = 0; i < DMX_FILTER_SIZE; i++)
 791                 filter->mode[i] ^= 0xff;
 792 }
 793
 794 static int dvb_dmxdev_add_pid(struct dmxdev *dmxdev,
 795                               struct dmxdev_filter *filter, u16 pid)
 796 {
 797         struct dmxdev_feed *feed;
 798
 799         if ((filter->type != DMXDEV_TYPE_PES) ||
 800             (filter->state < DMXDEV_STATE_SET))
 801                 return -EINVAL;
 802
 803         /* only TS packet filters may have multiple PIDs */
 804         if ((filter->params.pes.output != DMX_OUT_TSDEMUX_TAP) &&
 805             (!list_empty(&filter->feed.ts)))
 806                 return -EINVAL;
 807
 808         feed = kzalloc(sizeof(struct dmxdev_feed), GFP_KERNEL);
 809         if (feed == NULL)
 810                 return -ENOMEM;
 811
 812         feed->pid = pid;
 813         list_add(&feed->next, &filter->feed.ts);
 814
 815         if (filter->state >= DMXDEV_STATE_GO)
 816                 return dvb_dmxdev_start_feed(dmxdev, filter, feed);
 817
 818         return 0;
 819 }
 820
 821 static int dvb_dmxdev_remove_pid(struct dmxdev *dmxdev,
 822                                   struct dmxdev_filter *filter, u16 pid)
 823 {
 824         struct dmxdev_feed *feed, *tmp;
 825
 826         if ((filter->type != DMXDEV_TYPE_PES) ||
 827             (filter->state < DMXDEV_STATE_SET))
 828                 return -EINVAL;
 829
 830         list_for_each_entry_safe(feed, tmp, &filter->feed.ts, next) {
 831                 if ((feed->pid == pid) && (feed->ts != NULL)) {
 832                         feed->ts->stop_filtering(feed->ts);
 833                         filter->dev->demux->release_ts_feed(filter->dev->demux,
 834                                                             feed->ts);
 835                         list_del(&feed->next);
 836                         kfree(feed);
 837                 }
 838         }
 839
 840         return 0;
 841 }
 842
 843 static int dvb_dmxdev_filter_set(struct dmxdev *dmxdev,
 844                                  struct dmxdev_filter *dmxdevfilter,
 845                                  struct dmx_sct_filter_params *params)
 846 {
 847         dprintk("function : %s, PID=0x%04x, flags=%02x, timeout=%d\n",
 848                 __func__, params->pid, params->flags, params->timeout);
 849
 850         dvb_dmxdev_filter_stop(dmxdevfilter);
 851
 852         dmxdevfilter->type = DMXDEV_TYPE_SEC;
 853         memcpy(&dmxdevfilter->params.sec,
 854                params, sizeof(struct dmx_sct_filter_params));
 855         invert_mode(&dmxdevfilter->params.sec.filter);
 856         dvb_dmxdev_filter_state_set(dmxdevfilter, DMXDEV_STATE_SET);
 857
 858         if (params->flags & DMX_IMMEDIATE_START)
 859                 return dvb_dmxdev_filter_start(dmxdevfilter);
 860
 861         return 0;
 862 }
 863
 864 static int dvb_dmxdev_pes_filter_set(struct dmxdev *dmxdev,
 865                                      struct dmxdev_filter *dmxdevfilter,
 866                                      struct dmx_pes_filter_params *params)
 867 {
 868         int ret;
 869
 870         dvb_dmxdev_filter_stop(dmxdevfilter);
 871         dvb_dmxdev_filter_reset(dmxdevfilter);
 872
 873         if ((unsigned)params->pes_type > DMX_PES_OTHER)
 874                 return -EINVAL;
 875
 876         dmxdevfilter->type = DMXDEV_TYPE_PES;
 877         memcpy(&dmxdevfilter->params, params,
 878                sizeof(struct dmx_pes_filter_params));
 879         INIT_LIST_HEAD(&dmxdevfilter->feed.ts);
 880
 881         dvb_dmxdev_filter_state_set(dmxdevfilter, DMXDEV_STATE_SET);
 882
 883         ret = dvb_dmxdev_add_pid(dmxdev, dmxdevfilter,
 884                                  dmxdevfilter->params.pes.pid);
 885         if (ret < 0)
 886                 return ret;
 887
 888         if (params->flags & DMX_IMMEDIATE_START)
 889                 return dvb_dmxdev_filter_start(dmxdevfilter);
 890
 891         return 0;
 892 }
 893
 894 static ssize_t dvb_dmxdev_read_sec(struct dmxdev_filter *dfil,
 895                                    struct file *file, char __user *buf,
 896                                    size_t count, loff_t *ppos)
 897 {
 898         int result, hcount;
 899         int done = 0;
 900
 901         if (dfil->todo <= 0) {
 902                 hcount = 3 + dfil->todo;
 903                 if (hcount > count)
 904                         hcount = count;
 905                 result = dvb_dmxdev_buffer_read(&dfil->buffer,
 906                                                 file->f_flags & O_NONBLOCK,
 907                                                 buf, hcount, ppos);
 908                 if (result < 0) {
 909                         dfil->todo = 0;
 910                         return result;
 911                 }
 912                 if (copy_from_user(dfil->secheader - dfil->todo, buf, result))
 913                         return -EFAULT;
 914                 buf += result;
 915                 done = result;
 916                 count -= result;
 917                 dfil->todo -= result;
 918                 if (dfil->todo > -3)
 919                         return done;
 920                 dfil->todo = ((dfil->secheader[1] << 8) | dfil->secheader[2]) & 0xfff;
 921                 if (!count)
 922                         return done;
 923         }
 924         if (count > dfil->todo)
 925                 count = dfil->todo;
 926         result = dvb_dmxdev_buffer_read(&dfil->buffer,
 927                                         file->f_flags & O_NONBLOCK,
 928                                         buf, count, ppos);
 929         if (result < 0)
 930                 return result;
 931         dfil->todo -= result;
 932         return (result + done);
 933 }
 934
 935 static ssize_t
 936 dvb_demux_read(struct file *file, char __user *buf, size_t count,
 937                loff_t *ppos)
 938 {
 939         struct dmxdev_filter *dmxdevfilter = file->private_data;
 940         int ret;
 941
 942         if (mutex_lock_interruptible(&dmxdevfilter->mutex))
 943                 return -ERESTARTSYS;
 944
 945         if (dmxdevfilter->type == DMXDEV_TYPE_SEC)
 946                 ret = dvb_dmxdev_read_sec(dmxdevfilter, file, buf, count, ppos);
 947         else
 948                 ret = dvb_dmxdev_buffer_read(&dmxdevfilter->buffer,
 949                                              file->f_flags & O_NONBLOCK,
 950                                              buf, count, ppos);
 951
 952         mutex_unlock(&dmxdevfilter->mutex);
 953         return ret;
 954 }
 955
 956 static int dvb_demux_do_ioctl(struct file *file,
 957                               unsigned int cmd, void *parg)
 958 {
 959         struct dmxdev_filter *dmxdevfilter = file->private_data;
 960         struct dmxdev *dmxdev = dmxdevfilter->dev;
 961         unsigned long arg = (unsigned long)parg;
 962         int ret = 0;
 963
 964         if (mutex_lock_interruptible(&dmxdev->mutex))
 965                 return -ERESTARTSYS;
 966
 967         switch (cmd) {
 968         case DMX_START:
 969                 if (mutex_lock_interruptible(&dmxdevfilter->mutex)) {
 970                         mutex_unlock(&dmxdev->mutex);
 971                         return -ERESTARTSYS;
 972                 }
 973                 if (dmxdevfilter->state < DMXDEV_STATE_SET)
 974                         ret = -EINVAL;
 975                 else
 976                         ret = dvb_dmxdev_filter_start(dmxdevfilter);
 977                 mutex_unlock(&dmxdevfilter->mutex);
 978                 break;
 979
 980         case DMX_STOP:
 981                 if (mutex_lock_interruptible(&dmxdevfilter->mutex)) {
 982                         mutex_unlock(&dmxdev->mutex);
 983                         return -ERESTARTSYS;
 984                 }
 985                 ret = dvb_dmxdev_filter_stop(dmxdevfilter);
 986                 mutex_unlock(&dmxdevfilter->mutex);
 987                 break;
 988
 989         case DMX_SET_FILTER:
 990                 if (mutex_lock_interruptible(&dmxdevfilter->mutex)) {
 991                         mutex_unlock(&dmxdev->mutex);
 992                         return -ERESTARTSYS;
 993                 }
 994                 ret = dvb_dmxdev_filter_set(dmxdev, dmxdevfilter, parg);
 995                 mutex_unlock(&dmxdevfilter->mutex);
 996                 break;
 997
 998         case DMX_SET_PES_FILTER:
 999                 if (mutex_lock_interruptible(&dmxdevfilter->mutex)) {
1000                         mutex_unlock(&dmxdev->mutex);
1001                         return -ERESTARTSYS;
1002                 }
1003                 ret = dvb_dmxdev_pes_filter_set(dmxdev, dmxdevfilter, parg);
1004                 mutex_unlock(&dmxdevfilter->mutex);
1005                 break;
1006
1007         case DMX_SET_BUFFER_SIZE:
1008                 if (mutex_lock_interruptible(&dmxdevfilter->mutex)) {
1009                         mutex_unlock(&dmxdev->mutex);
1010                         return -ERESTARTSYS;
1011                 }
1012                 ret = dvb_dmxdev_set_buffer_size(dmxdevfilter, arg);
1013                 mutex_unlock(&dmxdevfilter->mutex);
1014                 break;
1015
1016         case DMX_GET_PES_PIDS:
1017                 if (!dmxdev->demux->get_pes_pids) {
1018                         ret = -EINVAL;
1019                         break;
1020                 }
1021                 dmxdev->demux->get_pes_pids(dmxdev->demux, parg);
1022                 break;
1023
1024 #if 0
1025         /* Not used upstream and never documented */
1026
1027         case DMX_GET_CAPS:
1028                 if (!dmxdev->demux->get_caps) {
1029                         ret = -EINVAL;
1030                         break;
1031                 }
1032                 ret = dmxdev->demux->get_caps(dmxdev->demux, parg);
1033                 break;
1034
1035         case DMX_SET_SOURCE:
1036                 if (!dmxdev->demux->set_source) {
1037                         ret = -EINVAL;
1038                         break;
1039                 }
1040                 ret = dmxdev->demux->set_source(dmxdev->demux, parg);
1041                 break;
1042 #endif
1043
1044         case DMX_GET_STC:
1045                 if (!dmxdev->demux->get_stc) {
1046                         ret = -EINVAL;
1047                         break;
1048                 }
1049                 ret = dmxdev->demux->get_stc(dmxdev->demux,
1050                                              ((struct dmx_stc *)parg)->num,
1051                                              &((struct dmx_stc *)parg)->stc,
1052                                              &((struct dmx_stc *)parg)->base);
1053                 break;
1054
1055         case DMX_ADD_PID:
1056                 if (mutex_lock_interruptible(&dmxdevfilter->mutex)) {
1057                         ret = -ERESTARTSYS;
1058                         break;
1059                 }
1060                 ret = dvb_dmxdev_add_pid(dmxdev, dmxdevfilter, *(u16 *)parg);
1061                 mutex_unlock(&dmxdevfilter->mutex);
1062                 break;
1063
1064         case DMX_REMOVE_PID:
1065                 if (mutex_lock_interruptible(&dmxdevfilter->mutex)) {
1066                         ret = -ERESTARTSYS;
1067                         break;
1068                 }
1069                 ret = dvb_dmxdev_remove_pid(dmxdev, dmxdevfilter, *(u16 *)parg);
1070                 mutex_unlock(&dmxdevfilter->mutex);
1071                 break;
1072
1073         default:
1074                 ret = -EINVAL;
1075                 break;
1076         }
1077         mutex_unlock(&dmxdev->mutex);
1078         return ret;
1079 }
1080
1081 static long dvb_demux_ioctl(struct file *file, unsigned int cmd,
1082                             unsigned long arg)
1083 {
1084         return dvb_usercopy(file, cmd, arg, dvb_demux_do_ioctl);
1085 }
1086
1087 static unsigned int dvb_demux_poll(struct file *file, poll_table *wait)
1088 {
1089         struct dmxdev_filter *dmxdevfilter = file->private_data;
1090         unsigned int mask = 0;
1091
1092         if ((!dmxdevfilter) || dmxdevfilter->dev->exit)
1093                 return POLLERR;
1094
1095         poll_wait(file, &dmxdevfilter->buffer.queue, wait);
1096
1097         if (dmxdevfilter->state != DMXDEV_STATE_GO &&
1098             dmxdevfilter->state != DMXDEV_STATE_DONE &&
1099             dmxdevfilter->state != DMXDEV_STATE_TIMEDOUT)
1100                 return 0;
1101
1102         if (dmxdevfilter->buffer.error)
1103                 mask |= (POLLIN | POLLRDNORM | POLLPRI | POLLERR);
1104
1105         if (!dvb_ringbuffer_empty(&dmxdevfilter->buffer))
1106                 mask |= (POLLIN | POLLRDNORM | POLLPRI);
1107
1108         return mask;
1109 }
1110
1111 static int dvb_demux_release(struct inode *inode, struct file *file)
1112 {
1113         struct dmxdev_filter *dmxdevfilter = file->private_data;
1114         struct dmxdev *dmxdev = dmxdevfilter->dev;
1115
1116         int ret;
1117
1118         ret = dvb_dmxdev_filter_free(dmxdev, dmxdevfilter);
1119
1120         mutex_lock(&dmxdev->mutex);
1121         dmxdev->dvbdev->users--;
1122         if(dmxdev->dvbdev->users==1 && dmxdev->exit==1) {
1123                 mutex_unlock(&dmxdev->mutex);
1124                 wake_up(&dmxdev->dvbdev->wait_queue);
1125         } else
1126                 mutex_unlock(&dmxdev->mutex);
1127
1128         return ret;
1129 }
1130
1131 static const struct file_operations dvb_demux_fops = {
1132         .owner = THIS_MODULE,
1133         .read = dvb_demux_read,
1134         .unlocked_ioctl = dvb_demux_ioctl,
1135         .open = dvb_demux_open,
1136         .release = dvb_demux_release,
1137         .poll = dvb_demux_poll,
1138         .llseek = default_llseek,
1139 };
1140
1141 static const struct dvb_device dvbdev_demux = {
1142         .priv = NULL,
1143         .users = 1,
1144         .writers = 1,
1145 #if defined(CONFIG_MEDIA_CONTROLLER_DVB)
1146         .name = "dvb-demux",
1147 #endif
1148         .fops = &dvb_demux_fops
1149 };
1150
1151 static int dvb_dvr_do_ioctl(struct file *file,
1152                             unsigned int cmd, void *parg)
1153 {
1154         struct dvb_device *dvbdev = file->private_data;
1155         struct dmxdev *dmxdev = dvbdev->priv;
1156         unsigned long arg = (unsigned long)parg;
1157         int ret;
1158
1159         if (mutex_lock_interruptible(&dmxdev->mutex))
1160                 return -ERESTARTSYS;
1161
1162         switch (cmd) {
1163         case DMX_SET_BUFFER_SIZE:
1164                 ret = dvb_dvr_set_buffer_size(dmxdev, arg);
1165                 break;
1166
1167         default:
1168                 ret = -EINVAL;
1169                 break;
1170         }
1171         mutex_unlock(&dmxdev->mutex);
1172         return ret;
1173 }
1174
1175 static long dvb_dvr_ioctl(struct file *file,
1176                          unsigned int cmd, unsigned long arg)
1177 {
1178         return dvb_usercopy(file, cmd, arg, dvb_dvr_do_ioctl);
1179 }
1180
1181 static unsigned int dvb_dvr_poll(struct file *file, poll_table *wait)
1182 {
1183         struct dvb_device *dvbdev = file->private_data;
1184         struct dmxdev *dmxdev = dvbdev->priv;
1185         unsigned int mask = 0;
1186
1187         dprintk("function : %s\n", __func__);
1188
1189         if (dmxdev->exit)
1190                 return POLLERR;
1191
1192         poll_wait(file, &dmxdev->dvr_buffer.queue, wait);
1193
1194         if ((file->f_flags & O_ACCMODE) == O_RDONLY) {
1195                 if (dmxdev->dvr_buffer.error)
1196                         mask |= (POLLIN | POLLRDNORM | POLLPRI | POLLERR);
1197
1198                 if (!dvb_ringbuffer_empty(&dmxdev->dvr_buffer))
1199                         mask |= (POLLIN | POLLRDNORM | POLLPRI);
1200         } else
1201                 mask |= (POLLOUT | POLLWRNORM | POLLPRI);
1202
1203         return mask;
1204 }
1205
1206 static const struct file_operations dvb_dvr_fops = {
1207         .owner = THIS_MODULE,
1208         .read = dvb_dvr_read,
1209         .write = dvb_dvr_write,
1210         .unlocked_ioctl = dvb_dvr_ioctl,
1211         .open = dvb_dvr_open,
1212         .release = dvb_dvr_release,
1213         .poll = dvb_dvr_poll,
1214         .llseek = default_llseek,
1215 };
1216
1217 static const struct dvb_device dvbdev_dvr = {
1218         .priv = NULL,
1219         .readers = 1,
1220         .users = 1,
1221 #if defined(CONFIG_MEDIA_CONTROLLER_DVB)
1222         .name = "dvb-dvr",
1223 #endif
1224         .fops = &dvb_dvr_fops
1225 };
1226 int dvb_dmxdev_init(struct dmxdev *dmxdev, struct dvb_adapter *dvb_adapter)
1227 {
1228         int i;
1229
1230         if (dmxdev->demux->open(dmxdev->demux) < 0)
1231                 return -EUSERS;
1232
1233         dmxdev->filter = vmalloc(dmxdev->filternum * sizeof(struct dmxdev_filter));
1234         if (!dmxdev->filter)
1235                 return -ENOMEM;
1236
1237         mutex_init(&dmxdev->mutex);
1238         spin_lock_init(&dmxdev->lock);
1239         for (i = 0; i < dmxdev->filternum; i++) {
1240                 dmxdev->filter[i].dev = dmxdev;
1241                 dmxdev->filter[i].buffer.data = NULL;
1242                 dvb_dmxdev_filter_state_set(&dmxdev->filter[i],
1243                                             DMXDEV_STATE_FREE);
1244         }
1245
1246         dvb_register_device(dvb_adapter, &dmxdev->dvbdev, &dvbdev_demux, dmxdev,
1247                             DVB_DEVICE_DEMUX);
1248         dvb_register_device(dvb_adapter, &dmxdev->dvr_dvbdev, &dvbdev_dvr,
1249                             dmxdev, DVB_DEVICE_DVR);
1250
1251         dvb_ringbuffer_init(&dmxdev->dvr_buffer, NULL, 8192);
1252
1253         return 0;
1254 }
1255
1256 EXPORT_SYMBOL(dvb_dmxdev_init);
1257
1258 void dvb_dmxdev_release(struct dmxdev *dmxdev)
1259 {
1260         dmxdev->exit=1;
1261         if (dmxdev->dvbdev->users > 1) {
1262                 wait_event(dmxdev->dvbdev->wait_queue,
1263                                 dmxdev->dvbdev->users==1);
1264         }
1265         if (dmxdev->dvr_dvbdev->users > 1) {
1266                 wait_event(dmxdev->dvr_dvbdev->wait_queue,
1267                                 dmxdev->dvr_dvbdev->users==1);
1268         }
1269
1270         dvb_unregister_device(dmxdev->dvbdev);
1271         dvb_unregister_device(dmxdev->dvr_dvbdev);
1272
1273         vfree(dmxdev->filter);
1274         dmxdev->filter = NULL;
1275         dmxdev->demux->close(dmxdev->demux);
1276 }
1277
1278 EXPORT_SYMBOL(dvb_dmxdev_release);