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  */
  18
  19 #define pr_fmt(fmt) "dmxdev: " fmt
  20
  21 #include <linux/sched.h>
  22 #include <linux/spinlock.h>
  23 #include <linux/slab.h>
  24 #include <linux/vmalloc.h>
  25 #include <linux/module.h>
  26 #include <linux/poll.h>
  27 #include <linux/ioctl.h>
  28 #include <linux/wait.h>
  29 #include <linux/uaccess.h>
  30 #include <media/dmxdev.h>
  31 #include <media/dvb_vb2.h>
  32
  33 static int debug;
  34
  35 module_param(debug, int, 0644);
  36 MODULE_PARM_DESC(debug, "Turn on/off debugging (default:off).");
  37
  38 #define dprintk(fmt, arg...) do {                                       \
  39         if (debug)                                                      \
  40                 printk(KERN_DEBUG pr_fmt("%s: " fmt),                   \
  41                         __func__, ##arg);                               \
  42 } while (0)
  43
  44 static int dvb_dmxdev_buffer_write(struct dvb_ringbuffer *buf,
  45                                    const u8 *src, size_t len)
  46 {
  47         ssize_t free;
  48
  49         if (!len)
  50                 return 0;
  51         if (!buf->data)
  52                 return 0;
  53
  54         free = dvb_ringbuffer_free(buf);
  55         if (len > free) {
  56                 dprintk("buffer overflow\n");
  57                 return -EOVERFLOW;
  58         }
  59
  60         return dvb_ringbuffer_write(buf, src, len);
  61 }
  62
  63 static ssize_t dvb_dmxdev_buffer_read(struct dvb_ringbuffer *src,
  64                                       int non_blocking, char __user *buf,
  65                                       size_t count, loff_t *ppos)
  66 {
  67         size_t todo;
  68         ssize_t avail;
  69         ssize_t ret = 0;
  70
  71         if (!src->data)
  72                 return 0;
  73
  74         if (src->error) {
  75                 ret = src->error;
  76                 dvb_ringbuffer_flush(src);
  77                 return ret;
  78         }
  79
  80         for (todo = count; todo > 0; todo -= ret) {
  81                 if (non_blocking && dvb_ringbuffer_empty(src)) {
  82                         ret = -EWOULDBLOCK;
  83                         break;
  84                 }
  85
  86                 ret = wait_event_interruptible(src->queue,
  87                                                !dvb_ringbuffer_empty(src) ||
  88                                                (src->error != 0));
  89                 if (ret < 0)
  90                         break;
  91
  92                 if (src->error) {
  93                         ret = src->error;
  94                         dvb_ringbuffer_flush(src);
  95                         break;
  96                 }
  97
  98                 avail = dvb_ringbuffer_avail(src);
  99                 if (avail > todo)
 100                         avail = todo;
 101
 102                 ret = dvb_ringbuffer_read_user(src, buf, avail);
 103                 if (ret < 0)
 104                         break;
 105
 106                 buf += ret;
 107         }
 108
 109         return (count - todo) ? (count - todo) : ret;
 110 }
 111
 112 static struct dmx_frontend *get_fe(struct dmx_demux *demux, int type)
 113 {
 114         struct list_head *head, *pos;
 115
 116         head = demux->get_frontends(demux);
 117         if (!head)
 118                 return NULL;
 119         list_for_each(pos, head)
 120                 if (DMX_FE_ENTRY(pos)->source == type)
 121                         return DMX_FE_ENTRY(pos);
 122
 123         return NULL;
 124 }
 125
 126 static int dvb_dvr_open(struct inode *inode, struct file *file)
 127 {
 128         struct dvb_device *dvbdev = file->private_data;
 129         struct dmxdev *dmxdev = dvbdev->priv;
 130         struct dmx_frontend *front;
 131         bool need_ringbuffer = false;
 132
 133         dprintk("%s\n", __func__);
 134
 135         if (mutex_lock_interruptible(&dmxdev->mutex))
 136                 return -ERESTARTSYS;
 137
 138         if (dmxdev->exit) {
 139                 mutex_unlock(&dmxdev->mutex);
 140                 return -ENODEV;
 141         }
 142
 143         dmxdev->may_do_mmap = 0;
 144
 145         /*
 146          * The logic here is a little tricky due to the ifdef.
 147          *
 148          * The ringbuffer is used for both read and mmap.
 149          *
 150          * It is not needed, however, on two situations:
 151          *      - Write devices (access with O_WRONLY);
 152          *      - For duplex device nodes, opened with O_RDWR.
 153          */
 154
 155         if ((file->f_flags & O_ACCMODE) == O_RDONLY)
 156                 need_ringbuffer = true;
 157         else if ((file->f_flags & O_ACCMODE) == O_RDWR) {
 158                 if (!(dmxdev->capabilities & DMXDEV_CAP_DUPLEX)) {
 159 #ifdef CONFIG_DVB_MMAP
 160                         dmxdev->may_do_mmap = 1;
 161                         need_ringbuffer = true;
 162 #else
 163                         mutex_unlock(&dmxdev->mutex);
 164                         return -EOPNOTSUPP;
 165 #endif
 166                 }
 167         }
 168
 169         if (need_ringbuffer) {
 170                 void *mem;
 171
 172                 if (!dvbdev->readers) {
 173                         mutex_unlock(&dmxdev->mutex);
 174                         return -EBUSY;
 175                 }
 176                 mem = vmalloc(DVR_BUFFER_SIZE);
 177                 if (!mem) {
 178                         mutex_unlock(&dmxdev->mutex);
 179                         return -ENOMEM;
 180                 }
 181                 dvb_ringbuffer_init(&dmxdev->dvr_buffer, mem, DVR_BUFFER_SIZE);
 182                 if (dmxdev->may_do_mmap)
 183                         dvb_vb2_init(&dmxdev->dvr_vb2_ctx, "dvr",
 184                                      file->f_flags & O_NONBLOCK);
 185                 dvbdev->readers--;
 186         }
 187
 188         if ((file->f_flags & O_ACCMODE) == O_WRONLY) {
 189                 dmxdev->dvr_orig_fe = dmxdev->demux->frontend;
 190
 191                 if (!dmxdev->demux->write) {
 192                         mutex_unlock(&dmxdev->mutex);
 193                         return -EOPNOTSUPP;
 194                 }
 195
 196                 front = get_fe(dmxdev->demux, DMX_MEMORY_FE);
 197
 198                 if (!front) {
 199                         mutex_unlock(&dmxdev->mutex);
 200                         return -EINVAL;
 201                 }
 202                 dmxdev->demux->disconnect_frontend(dmxdev->demux);
 203                 dmxdev->demux->connect_frontend(dmxdev->demux, front);
 204         }
 205         dvbdev->users++;
 206         mutex_unlock(&dmxdev->mutex);
 207         return 0;
 208 }
 209
 210 static int dvb_dvr_release(struct inode *inode, struct file *file)
 211 {
 212         struct dvb_device *dvbdev = file->private_data;
 213         struct dmxdev *dmxdev = dvbdev->priv;
 214
 215         mutex_lock(&dmxdev->mutex);
 216
 217         if ((file->f_flags & O_ACCMODE) == O_WRONLY) {
 218                 dmxdev->demux->disconnect_frontend(dmxdev->demux);
 219                 dmxdev->demux->connect_frontend(dmxdev->demux,
 220                                                 dmxdev->dvr_orig_fe);
 221         }
 222
 223         if (((file->f_flags & O_ACCMODE) == O_RDONLY) ||
 224             dmxdev->may_do_mmap) {
 225                 if (dmxdev->may_do_mmap) {
 226                         if (dvb_vb2_is_streaming(&dmxdev->dvr_vb2_ctx))
 227                                 dvb_vb2_stream_off(&dmxdev->dvr_vb2_ctx);
 228                         dvb_vb2_release(&dmxdev->dvr_vb2_ctx);
 229                 }
 230                 dvbdev->readers++;
 231                 if (dmxdev->dvr_buffer.data) {
 232                         void *mem = dmxdev->dvr_buffer.data;
 233                         /*memory barrier*/
 234                         mb();
 235                         spin_lock_irq(&dmxdev->lock);
 236                         dmxdev->dvr_buffer.data = NULL;
 237                         spin_unlock_irq(&dmxdev->lock);
 238                         vfree(mem);
 239                 }
 240         }
 241         /* TODO */
 242         dvbdev->users--;
 243         if (dvbdev->users == 1 && dmxdev->exit == 1) {
 244                 mutex_unlock(&dmxdev->mutex);
 245                 wake_up(&dvbdev->wait_queue);
 246         } else
 247                 mutex_unlock(&dmxdev->mutex);
 248
 249         return 0;
 250 }
 251
 252 static ssize_t dvb_dvr_write(struct file *file, const char __user *buf,
 253                              size_t count, loff_t *ppos)
 254 {
 255         struct dvb_device *dvbdev = file->private_data;
 256         struct dmxdev *dmxdev = dvbdev->priv;
 257         int ret;
 258
 259         if (!dmxdev->demux->write)
 260                 return -EOPNOTSUPP;
 261         if ((file->f_flags & O_ACCMODE) != O_WRONLY)
 262                 return -EINVAL;
 263         if (mutex_lock_interruptible(&dmxdev->mutex))
 264                 return -ERESTARTSYS;
 265
 266         if (dmxdev->exit) {
 267                 mutex_unlock(&dmxdev->mutex);
 268                 return -ENODEV;
 269         }
 270         ret = dmxdev->demux->write(dmxdev->demux, buf, count);
 271         mutex_unlock(&dmxdev->mutex);
 272         return ret;
 273 }
 274
 275 static ssize_t dvb_dvr_read(struct file *file, char __user *buf, size_t count,
 276                             loff_t *ppos)
 277 {
 278         struct dvb_device *dvbdev = file->private_data;
 279         struct dmxdev *dmxdev = dvbdev->priv;
 280
 281         if (dmxdev->exit)
 282                 return -ENODEV;
 283
 284         return dvb_dmxdev_buffer_read(&dmxdev->dvr_buffer,
 285                                       file->f_flags & O_NONBLOCK,
 286                                       buf, count, ppos);
 287 }
 288
 289 static int dvb_dvr_set_buffer_size(struct dmxdev *dmxdev,
 290                                       unsigned long size)
 291 {
 292         struct dvb_ringbuffer *buf = &dmxdev->dvr_buffer;
 293         void *newmem;
 294         void *oldmem;
 295
 296         dprintk("%s\n", __func__);
 297
 298         if (buf->size == size)
 299                 return 0;
 300         if (!size)
 301                 return -EINVAL;
 302
 303         newmem = vmalloc(size);
 304         if (!newmem)
 305                 return -ENOMEM;
 306
 307         oldmem = buf->data;
 308
 309         spin_lock_irq(&dmxdev->lock);
 310         buf->data = newmem;
 311         buf->size = size;
 312
 313         /* reset and not flush in case the buffer shrinks */
 314         dvb_ringbuffer_reset(buf);
 315         spin_unlock_irq(&dmxdev->lock);
 316
 317         vfree(oldmem);
 318
 319         return 0;
 320 }
 321
 322 static inline void dvb_dmxdev_filter_state_set(struct dmxdev_filter
 323                                                *dmxdevfilter, int state)
 324 {
 325         spin_lock_irq(&dmxdevfilter->dev->lock);
 326         dmxdevfilter->state = state;
 327         spin_unlock_irq(&dmxdevfilter->dev->lock);
 328 }
 329
 330 static int dvb_dmxdev_set_buffer_size(struct dmxdev_filter *dmxdevfilter,
 331                                       unsigned long size)
 332 {
 333         struct dvb_ringbuffer *buf = &dmxdevfilter->buffer;
 334         void *newmem;
 335         void *oldmem;
 336
 337         if (buf->size == size)
 338                 return 0;
 339         if (!size)
 340                 return -EINVAL;
 341         if (dmxdevfilter->state >= DMXDEV_STATE_GO)
 342                 return -EBUSY;
 343
 344         newmem = vmalloc(size);
 345         if (!newmem)
 346                 return -ENOMEM;
 347
 348         oldmem = buf->data;
 349
 350         spin_lock_irq(&dmxdevfilter->dev->lock);
 351         buf->data = newmem;
 352         buf->size = size;
 353
 354         /* reset and not flush in case the buffer shrinks */
 355         dvb_ringbuffer_reset(buf);
 356         spin_unlock_irq(&dmxdevfilter->dev->lock);
 357
 358         vfree(oldmem);
 359
 360         return 0;
 361 }
 362
 363 static void dvb_dmxdev_filter_timeout(struct timer_list *t)
 364 {
 365         struct dmxdev_filter *dmxdevfilter = from_timer(dmxdevfilter, t, timer);
 366
 367         dmxdevfilter->buffer.error = -ETIMEDOUT;
 368         spin_lock_irq(&dmxdevfilter->dev->lock);
 369         dmxdevfilter->state = DMXDEV_STATE_TIMEDOUT;
 370         spin_unlock_irq(&dmxdevfilter->dev->lock);
 371         wake_up(&dmxdevfilter->buffer.queue);
 372 }
 373
 374 static void dvb_dmxdev_filter_timer(struct dmxdev_filter *dmxdevfilter)
 375 {
 376         struct dmx_sct_filter_params *para = &dmxdevfilter->params.sec;
 377
 378         del_timer(&dmxdevfilter->timer);
 379         if (para->timeout) {
 380                 dmxdevfilter->timer.expires =
 381                     jiffies + 1 + (HZ / 2 + HZ * para->timeout) / 1000;
 382                 add_timer(&dmxdevfilter->timer);
 383         }
 384 }
 385
 386 static int dvb_dmxdev_section_callback(const u8 *buffer1, size_t buffer1_len,
 387                                        const u8 *buffer2, size_t buffer2_len,
 388                                        struct dmx_section_filter *filter,
 389                                        u32 *buffer_flags)
 390 {
 391         struct dmxdev_filter *dmxdevfilter = filter->priv;
 392         int ret;
 393
 394         if (!dvb_vb2_is_streaming(&dmxdevfilter->vb2_ctx) &&
 395             dmxdevfilter->buffer.error) {
 396                 wake_up(&dmxdevfilter->buffer.queue);
 397                 return 0;
 398         }
 399         spin_lock(&dmxdevfilter->dev->lock);
 400         if (dmxdevfilter->state != DMXDEV_STATE_GO) {
 401                 spin_unlock(&dmxdevfilter->dev->lock);
 402                 return 0;
 403         }
 404         del_timer(&dmxdevfilter->timer);
 405         dprintk("section callback %*ph\n", 6, buffer1);
 406         if (dvb_vb2_is_streaming(&dmxdevfilter->vb2_ctx)) {
 407                 ret = dvb_vb2_fill_buffer(&dmxdevfilter->vb2_ctx,
 408                                           buffer1, buffer1_len,
 409                                           buffer_flags);
 410                 if (ret == buffer1_len)
 411                         ret = dvb_vb2_fill_buffer(&dmxdevfilter->vb2_ctx,
 412                                                   buffer2, buffer2_len,
 413                                                   buffer_flags);
 414         } else {
 415                 ret = dvb_dmxdev_buffer_write(&dmxdevfilter->buffer,
 416                                               buffer1, buffer1_len);
 417                 if (ret == buffer1_len) {
 418                         ret = dvb_dmxdev_buffer_write(&dmxdevfilter->buffer,
 419                                                       buffer2, buffer2_len);
 420                 }
 421         }
 422         if (ret < 0)
 423                 dmxdevfilter->buffer.error = ret;
 424         if (dmxdevfilter->params.sec.flags & DMX_ONESHOT)
 425                 dmxdevfilter->state = DMXDEV_STATE_DONE;
 426         spin_unlock(&dmxdevfilter->dev->lock);
 427         wake_up(&dmxdevfilter->buffer.queue);
 428         return 0;
 429 }
 430
 431 static int dvb_dmxdev_ts_callback(const u8 *buffer1, size_t buffer1_len,
 432                                   const u8 *buffer2, size_t buffer2_len,
 433                                   struct dmx_ts_feed *feed,
 434                                   u32 *buffer_flags)
 435 {
 436         struct dmxdev_filter *dmxdevfilter = feed->priv;
 437         struct dvb_ringbuffer *buffer;
 438 #ifdef CONFIG_DVB_MMAP
 439         struct dvb_vb2_ctx *ctx;
 440 #endif
 441         int ret;
 442
 443         spin_lock(&dmxdevfilter->dev->lock);
 444         if (dmxdevfilter->params.pes.output == DMX_OUT_DECODER) {
 445                 spin_unlock(&dmxdevfilter->dev->lock);
 446                 return 0;
 447         }
 448
 449         if (dmxdevfilter->params.pes.output == DMX_OUT_TAP ||
 450             dmxdevfilter->params.pes.output == DMX_OUT_TSDEMUX_TAP) {
 451                 buffer = &dmxdevfilter->buffer;
 452 #ifdef CONFIG_DVB_MMAP
 453                 ctx = &dmxdevfilter->vb2_ctx;
 454 #endif
 455         } else {
 456                 buffer = &dmxdevfilter->dev->dvr_buffer;
 457 #ifdef CONFIG_DVB_MMAP
 458                 ctx = &dmxdevfilter->dev->dvr_vb2_ctx;
 459 #endif
 460         }
 461
 462         if (dvb_vb2_is_streaming(ctx)) {
 463                 ret = dvb_vb2_fill_buffer(ctx, buffer1, buffer1_len,
 464                                           buffer_flags);
 465                 if (ret == buffer1_len)
 466                         ret = dvb_vb2_fill_buffer(ctx, buffer2, buffer2_len,
 467                                                   buffer_flags);
 468         } else {
 469                 if (buffer->error) {
 470                         spin_unlock(&dmxdevfilter->dev->lock);
 471                         wake_up(&buffer->queue);
 472                         return 0;
 473                 }
 474                 ret = dvb_dmxdev_buffer_write(buffer, buffer1, buffer1_len);
 475                 if (ret == buffer1_len)
 476                         ret = dvb_dmxdev_buffer_write(buffer,
 477                                                       buffer2, buffer2_len);
 478         }
 479         if (ret < 0)
 480                 buffer->error = ret;
 481         spin_unlock(&dmxdevfilter->dev->lock);
 482         wake_up(&buffer->queue);
 483         return 0;
 484 }
 485
 486 /* stop feed but only mark the specified filter as stopped (state set) */
 487 static int dvb_dmxdev_feed_stop(struct dmxdev_filter *dmxdevfilter)
 488 {
 489         struct dmxdev_feed *feed;
 490
 491         dvb_dmxdev_filter_state_set(dmxdevfilter, DMXDEV_STATE_SET);
 492
 493         switch (dmxdevfilter->type) {
 494         case DMXDEV_TYPE_SEC:
 495                 del_timer(&dmxdevfilter->timer);
 496                 dmxdevfilter->feed.sec->stop_filtering(dmxdevfilter->feed.sec);
 497                 break;
 498         case DMXDEV_TYPE_PES:
 499                 list_for_each_entry(feed, &dmxdevfilter->feed.ts, next)
 500                         feed->ts->stop_filtering(feed->ts);
 501                 break;
 502         default:
 503                 return -EINVAL;
 504         }
 505         return 0;
 506 }
 507
 508 /* start feed associated with the specified filter */
 509 static int dvb_dmxdev_feed_start(struct dmxdev_filter *filter)
 510 {
 511         struct dmxdev_feed *feed;
 512         int ret;
 513
 514         dvb_dmxdev_filter_state_set(filter, DMXDEV_STATE_GO);
 515
 516         switch (filter->type) {
 517         case DMXDEV_TYPE_SEC:
 518                 return filter->feed.sec->start_filtering(filter->feed.sec);
 519         case DMXDEV_TYPE_PES:
 520                 list_for_each_entry(feed, &filter->feed.ts, next) {
 521                         ret = feed->ts->start_filtering(feed->ts);
 522                         if (ret < 0) {
 523                                 dvb_dmxdev_feed_stop(filter);
 524                                 return ret;
 525                         }
 526                 }
 527                 break;
 528         default:
 529                 return -EINVAL;
 530         }
 531
 532         return 0;
 533 }
 534
 535 /* restart section feed if it has filters left associated with it,
 536    otherwise release the feed */
 537 static int dvb_dmxdev_feed_restart(struct dmxdev_filter *filter)
 538 {
 539         int i;
 540         struct dmxdev *dmxdev = filter->dev;
 541         u16 pid = filter->params.sec.pid;
 542
 543         for (i = 0; i < dmxdev->filternum; i++)
 544                 if (dmxdev->filter[i].state >= DMXDEV_STATE_GO &&
 545                     dmxdev->filter[i].type == DMXDEV_TYPE_SEC &&
 546                     dmxdev->filter[i].params.sec.pid == pid) {
 547                         dvb_dmxdev_feed_start(&dmxdev->filter[i]);
 548                         return 0;
 549                 }
 550
 551         filter->dev->demux->release_section_feed(dmxdev->demux,
 552                                                  filter->feed.sec);
 553
 554         return 0;
 555 }
 556
 557 static int dvb_dmxdev_filter_stop(struct dmxdev_filter *dmxdevfilter)
 558 {
 559         struct dmxdev_feed *feed;
 560         struct dmx_demux *demux;
 561
 562         if (dmxdevfilter->state < DMXDEV_STATE_GO)
 563                 return 0;
 564
 565         switch (dmxdevfilter->type) {
 566         case DMXDEV_TYPE_SEC:
 567                 if (!dmxdevfilter->feed.sec)
 568                         break;
 569                 dvb_dmxdev_feed_stop(dmxdevfilter);
 570                 if (dmxdevfilter->filter.sec)
 571                         dmxdevfilter->feed.sec->
 572                             release_filter(dmxdevfilter->feed.sec,
 573                                            dmxdevfilter->filter.sec);
 574                 dvb_dmxdev_feed_restart(dmxdevfilter);
 575                 dmxdevfilter->feed.sec = NULL;
 576                 break;
 577         case DMXDEV_TYPE_PES:
 578                 dvb_dmxdev_feed_stop(dmxdevfilter);
 579                 demux = dmxdevfilter->dev->demux;
 580                 list_for_each_entry(feed, &dmxdevfilter->feed.ts, next) {
 581                         demux->release_ts_feed(demux, feed->ts);
 582                         feed->ts = NULL;
 583                 }
 584                 break;
 585         default:
 586                 if (dmxdevfilter->state == DMXDEV_STATE_ALLOCATED)
 587                         return 0;
 588                 return -EINVAL;
 589         }
 590
 591         dvb_ringbuffer_flush(&dmxdevfilter->buffer);
 592         return 0;
 593 }
 594
 595 static void dvb_dmxdev_delete_pids(struct dmxdev_filter *dmxdevfilter)
 596 {
 597         struct dmxdev_feed *feed, *tmp;
 598
 599         /* delete all PIDs */
 600         list_for_each_entry_safe(feed, tmp, &dmxdevfilter->feed.ts, next) {
 601                 list_del(&feed->next);
 602                 kfree(feed);
 603         }
 604
 605         BUG_ON(!list_empty(&dmxdevfilter->feed.ts));
 606 }
 607
 608 static inline int dvb_dmxdev_filter_reset(struct dmxdev_filter *dmxdevfilter)
 609 {
 610         if (dmxdevfilter->state < DMXDEV_STATE_SET)
 611                 return 0;
 612
 613         if (dmxdevfilter->type == DMXDEV_TYPE_PES)
 614                 dvb_dmxdev_delete_pids(dmxdevfilter);
 615
 616         dmxdevfilter->type = DMXDEV_TYPE_NONE;
 617         dvb_dmxdev_filter_state_set(dmxdevfilter, DMXDEV_STATE_ALLOCATED);
 618         return 0;
 619 }
 620
 621 static int dvb_dmxdev_start_feed(struct dmxdev *dmxdev,
 622                                  struct dmxdev_filter *filter,
 623                                  struct dmxdev_feed *feed)
 624 {
 625         ktime_t timeout = ktime_set(0, 0);
 626         struct dmx_pes_filter_params *para = &filter->params.pes;
 627         enum dmx_output otype;
 628         int ret;
 629         int ts_type;
 630         enum dmx_ts_pes ts_pes;
 631         struct dmx_ts_feed *tsfeed;
 632
 633         feed->ts = NULL;
 634         otype = para->output;
 635
 636         ts_pes = para->pes_type;
 637
 638         if (ts_pes < DMX_PES_OTHER)
 639                 ts_type = TS_DECODER;
 640         else
 641                 ts_type = 0;
 642
 643         if (otype == DMX_OUT_TS_TAP)
 644                 ts_type |= TS_PACKET;
 645         else if (otype == DMX_OUT_TSDEMUX_TAP)
 646                 ts_type |= TS_PACKET | TS_DEMUX;
 647         else if (otype == DMX_OUT_TAP)
 648                 ts_type |= TS_PACKET | TS_DEMUX | TS_PAYLOAD_ONLY;
 649
 650         ret = dmxdev->demux->allocate_ts_feed(dmxdev->demux, &feed->ts,
 651                                               dvb_dmxdev_ts_callback);
 652         if (ret < 0)
 653                 return ret;
 654
 655         tsfeed = feed->ts;
 656         tsfeed->priv = filter;
 657
 658         ret = tsfeed->set(tsfeed, feed->pid, ts_type, ts_pes, timeout);
 659         if (ret < 0) {
 660                 dmxdev->demux->release_ts_feed(dmxdev->demux, tsfeed);
 661                 return ret;
 662         }
 663
 664         ret = tsfeed->start_filtering(tsfeed);
 665         if (ret < 0) {
 666                 dmxdev->demux->release_ts_feed(dmxdev->demux, tsfeed);
 667                 return ret;
 668         }
 669
 670         return 0;
 671 }
 672
 673 static int dvb_dmxdev_filter_start(struct dmxdev_filter *filter)
 674 {
 675         struct dmxdev *dmxdev = filter->dev;
 676         struct dmxdev_feed *feed;
 677         void *mem;
 678         int ret, i;
 679
 680         if (filter->state < DMXDEV_STATE_SET)
 681                 return -EINVAL;
 682
 683         if (filter->state >= DMXDEV_STATE_GO)
 684                 dvb_dmxdev_filter_stop(filter);
 685
 686         if (!filter->buffer.data) {
 687                 mem = vmalloc(filter->buffer.size);
 688                 if (!mem)
 689                         return -ENOMEM;
 690                 spin_lock_irq(&filter->dev->lock);
 691                 filter->buffer.data = mem;
 692                 spin_unlock_irq(&filter->dev->lock);
 693         }
 694
 695         dvb_ringbuffer_flush(&filter->buffer);
 696
 697         switch (filter->type) {
 698         case DMXDEV_TYPE_SEC:
 699         {
 700                 struct dmx_sct_filter_params *para = &filter->params.sec;
 701                 struct dmx_section_filter **secfilter = &filter->filter.sec;
 702                 struct dmx_section_feed **secfeed = &filter->feed.sec;
 703
 704                 *secfilter = NULL;
 705                 *secfeed = NULL;
 706
 707
 708                 /* find active filter/feed with same PID */
 709                 for (i = 0; i < dmxdev->filternum; i++) {
 710                         if (dmxdev->filter[i].state >= DMXDEV_STATE_GO &&
 711                             dmxdev->filter[i].type == DMXDEV_TYPE_SEC &&
 712                             dmxdev->filter[i].params.sec.pid == para->pid) {
 713                                 *secfeed = dmxdev->filter[i].feed.sec;
 714                                 break;
 715                         }
 716                 }
 717
 718                 /* if no feed found, try to allocate new one */
 719                 if (!*secfeed) {
 720                         ret = dmxdev->demux->allocate_section_feed(dmxdev->demux,
 721                                                                    secfeed,
 722                                                                    dvb_dmxdev_section_callback);
 723                         if (ret < 0) {
 724                                 pr_err("DVB (%s): could not alloc feed\n",
 725                                        __func__);
 726                                 return ret;
 727                         }
 728
 729                         ret = (*secfeed)->set(*secfeed, para->pid,
 730                                               (para->flags & DMX_CHECK_CRC) ? 1 : 0);
 731                         if (ret < 0) {
 732                                 pr_err("DVB (%s): could not set feed\n",
 733                                        __func__);
 734                                 dvb_dmxdev_feed_restart(filter);
 735                                 return ret;
 736                         }
 737                 } else {
 738                         dvb_dmxdev_feed_stop(filter);
 739                 }
 740
 741                 ret = (*secfeed)->allocate_filter(*secfeed, secfilter);
 742                 if (ret < 0) {
 743                         dvb_dmxdev_feed_restart(filter);
 744                         filter->feed.sec->start_filtering(*secfeed);
 745                         dprintk("could not get filter\n");
 746                         return ret;
 747                 }
 748
 749                 (*secfilter)->priv = filter;
 750
 751                 memcpy(&((*secfilter)->filter_value[3]),
 752                        &(para->filter.filter[1]), DMX_FILTER_SIZE - 1);
 753                 memcpy(&(*secfilter)->filter_mask[3],
 754                        &para->filter.mask[1], DMX_FILTER_SIZE - 1);
 755                 memcpy(&(*secfilter)->filter_mode[3],
 756                        &para->filter.mode[1], DMX_FILTER_SIZE - 1);
 757
 758                 (*secfilter)->filter_value[0] = para->filter.filter[0];
 759                 (*secfilter)->filter_mask[0] = para->filter.mask[0];
 760                 (*secfilter)->filter_mode[0] = para->filter.mode[0];
 761                 (*secfilter)->filter_mask[1] = 0;
 762                 (*secfilter)->filter_mask[2] = 0;
 763
 764                 filter->todo = 0;
 765
 766                 ret = filter->feed.sec->start_filtering(filter->feed.sec);
 767                 if (ret < 0)
 768                         return ret;
 769
 770                 dvb_dmxdev_filter_timer(filter);
 771                 break;
 772         }
 773         case DMXDEV_TYPE_PES:
 774                 list_for_each_entry(feed, &filter->feed.ts, next) {
 775                         ret = dvb_dmxdev_start_feed(dmxdev, filter, feed);
 776                         if (ret < 0) {
 777                                 dvb_dmxdev_filter_stop(filter);
 778                                 return ret;
 779                         }
 780                 }
 781                 break;
 782         default:
 783                 return -EINVAL;
 784         }
 785
 786         dvb_dmxdev_filter_state_set(filter, DMXDEV_STATE_GO);
 787         return 0;
 788 }
 789
 790 static int dvb_demux_open(struct inode *inode, struct file *file)
 791 {
 792         struct dvb_device *dvbdev = file->private_data;
 793         struct dmxdev *dmxdev = dvbdev->priv;
 794         int i;
 795         struct dmxdev_filter *dmxdevfilter;
 796
 797         if (!dmxdev->filter)
 798                 return -EINVAL;
 799
 800         if (mutex_lock_interruptible(&dmxdev->mutex))
 801                 return -ERESTARTSYS;
 802
 803         if (dmxdev->exit) {
 804                 mutex_unlock(&dmxdev->mutex);
 805                 return -ENODEV;
 806         }
 807
 808         for (i = 0; i < dmxdev->filternum; i++)
 809                 if (dmxdev->filter[i].state == DMXDEV_STATE_FREE)
 810                         break;
 811
 812         if (i == dmxdev->filternum) {
 813                 mutex_unlock(&dmxdev->mutex);
 814                 return -EMFILE;
 815         }
 816
 817         dmxdevfilter = &dmxdev->filter[i];
 818         mutex_init(&dmxdevfilter->mutex);
 819         file->private_data = dmxdevfilter;
 820
 821 #ifdef CONFIG_DVB_MMAP
 822         dmxdev->may_do_mmap = 1;
 823 #else
 824         dmxdev->may_do_mmap = 0;
 825 #endif
 826
 827         dvb_ringbuffer_init(&dmxdevfilter->buffer, NULL, 8192);
 828         dvb_vb2_init(&dmxdevfilter->vb2_ctx, "demux_filter",
 829                      file->f_flags & O_NONBLOCK);
 830         dmxdevfilter->type = DMXDEV_TYPE_NONE;
 831         dvb_dmxdev_filter_state_set(dmxdevfilter, DMXDEV_STATE_ALLOCATED);
 832         timer_setup(&dmxdevfilter->timer, dvb_dmxdev_filter_timeout, 0);
 833
 834         dvbdev->users++;
 835
 836         mutex_unlock(&dmxdev->mutex);
 837         return 0;
 838 }
 839
 840 static int dvb_dmxdev_filter_free(struct dmxdev *dmxdev,
 841                                   struct dmxdev_filter *dmxdevfilter)
 842 {
 843         mutex_lock(&dmxdev->mutex);
 844         mutex_lock(&dmxdevfilter->mutex);
 845         if (dvb_vb2_is_streaming(&dmxdevfilter->vb2_ctx))
 846                 dvb_vb2_stream_off(&dmxdevfilter->vb2_ctx);
 847         dvb_vb2_release(&dmxdevfilter->vb2_ctx);
 848
 849
 850         dvb_dmxdev_filter_stop(dmxdevfilter);
 851         dvb_dmxdev_filter_reset(dmxdevfilter);
 852
 853         if (dmxdevfilter->buffer.data) {
 854                 void *mem = dmxdevfilter->buffer.data;
 855
 856                 spin_lock_irq(&dmxdev->lock);
 857                 dmxdevfilter->buffer.data = NULL;
 858                 spin_unlock_irq(&dmxdev->lock);
 859                 vfree(mem);
 860         }
 861
 862         dvb_dmxdev_filter_state_set(dmxdevfilter, DMXDEV_STATE_FREE);
 863         wake_up(&dmxdevfilter->buffer.queue);
 864         mutex_unlock(&dmxdevfilter->mutex);
 865         mutex_unlock(&dmxdev->mutex);
 866         return 0;
 867 }
 868
 869 static inline void invert_mode(struct dmx_filter *filter)
 870 {
 871         int i;
 872
 873         for (i = 0; i < DMX_FILTER_SIZE; i++)
 874                 filter->mode[i] ^= 0xff;
 875 }
 876
 877 static int dvb_dmxdev_add_pid(struct dmxdev *dmxdev,
 878                               struct dmxdev_filter *filter, u16 pid)
 879 {
 880         struct dmxdev_feed *feed;
 881
 882         if ((filter->type != DMXDEV_TYPE_PES) ||
 883             (filter->state < DMXDEV_STATE_SET))
 884                 return -EINVAL;
 885
 886         /* only TS packet filters may have multiple PIDs */
 887         if ((filter->params.pes.output != DMX_OUT_TSDEMUX_TAP) &&
 888             (!list_empty(&filter->feed.ts)))
 889                 return -EINVAL;
 890
 891         feed = kzalloc(sizeof(struct dmxdev_feed), GFP_KERNEL);
 892         if (feed == NULL)
 893                 return -ENOMEM;
 894
 895         feed->pid = pid;
 896         list_add(&feed->next, &filter->feed.ts);
 897
 898         if (filter->state >= DMXDEV_STATE_GO)
 899                 return dvb_dmxdev_start_feed(dmxdev, filter, feed);
 900
 901         return 0;
 902 }
 903
 904 static int dvb_dmxdev_remove_pid(struct dmxdev *dmxdev,
 905                                   struct dmxdev_filter *filter, u16 pid)
 906 {
 907         struct dmxdev_feed *feed, *tmp;
 908
 909         if ((filter->type != DMXDEV_TYPE_PES) ||
 910             (filter->state < DMXDEV_STATE_SET))
 911                 return -EINVAL;
 912
 913         list_for_each_entry_safe(feed, tmp, &filter->feed.ts, next) {
 914                 if ((feed->pid == pid) && (feed->ts != NULL)) {
 915                         feed->ts->stop_filtering(feed->ts);
 916                         filter->dev->demux->release_ts_feed(filter->dev->demux,
 917                                                             feed->ts);
 918                         list_del(&feed->next);
 919                         kfree(feed);
 920                 }
 921         }
 922
 923         return 0;
 924 }
 925
 926 static int dvb_dmxdev_filter_set(struct dmxdev *dmxdev,
 927                                  struct dmxdev_filter *dmxdevfilter,
 928                                  struct dmx_sct_filter_params *params)
 929 {
 930         dprintk("%s: PID=0x%04x, flags=%02x, timeout=%d\n",
 931                 __func__, params->pid, params->flags, params->timeout);
 932
 933         dvb_dmxdev_filter_stop(dmxdevfilter);
 934
 935         dmxdevfilter->type = DMXDEV_TYPE_SEC;
 936         memcpy(&dmxdevfilter->params.sec,
 937                params, sizeof(struct dmx_sct_filter_params));
 938         invert_mode(&dmxdevfilter->params.sec.filter);
 939         dvb_dmxdev_filter_state_set(dmxdevfilter, DMXDEV_STATE_SET);
 940
 941         if (params->flags & DMX_IMMEDIATE_START)
 942                 return dvb_dmxdev_filter_start(dmxdevfilter);
 943
 944         return 0;
 945 }
 946
 947 static int dvb_dmxdev_pes_filter_set(struct dmxdev *dmxdev,
 948                                      struct dmxdev_filter *dmxdevfilter,
 949                                      struct dmx_pes_filter_params *params)
 950 {
 951         int ret;
 952
 953         dvb_dmxdev_filter_stop(dmxdevfilter);
 954         dvb_dmxdev_filter_reset(dmxdevfilter);
 955
 956         if ((unsigned int)params->pes_type > DMX_PES_OTHER)
 957                 return -EINVAL;
 958
 959         dmxdevfilter->type = DMXDEV_TYPE_PES;
 960         memcpy(&dmxdevfilter->params, params,
 961                sizeof(struct dmx_pes_filter_params));
 962         INIT_LIST_HEAD(&dmxdevfilter->feed.ts);
 963
 964         dvb_dmxdev_filter_state_set(dmxdevfilter, DMXDEV_STATE_SET);
 965
 966         ret = dvb_dmxdev_add_pid(dmxdev, dmxdevfilter,
 967                                  dmxdevfilter->params.pes.pid);
 968         if (ret < 0)
 969                 return ret;
 970
 971         if (params->flags & DMX_IMMEDIATE_START)
 972                 return dvb_dmxdev_filter_start(dmxdevfilter);
 973
 974         return 0;
 975 }
 976
 977 static ssize_t dvb_dmxdev_read_sec(struct dmxdev_filter *dfil,
 978                                    struct file *file, char __user *buf,
 979                                    size_t count, loff_t *ppos)
 980 {
 981         int result, hcount;
 982         int done = 0;
 983
 984         if (dfil->todo <= 0) {
 985                 hcount = 3 + dfil->todo;
 986                 if (hcount > count)
 987                         hcount = count;
 988                 result = dvb_dmxdev_buffer_read(&dfil->buffer,
 989                                                 file->f_flags & O_NONBLOCK,
 990                                                 buf, hcount, ppos);
 991                 if (result < 0) {
 992                         dfil->todo = 0;
 993                         return result;
 994                 }
 995                 if (copy_from_user(dfil->secheader - dfil->todo, buf, result))
 996                         return -EFAULT;
 997                 buf += result;
 998                 done = result;
 999                 count -= result;
1000                 dfil->todo -= result;
1001                 if (dfil->todo > -3)
1002                         return done;
1003                 dfil->todo = ((dfil->secheader[1] << 8) | dfil->secheader[2]) & 0xfff;
1004                 if (!count)
1005                         return done;
1006         }
1007         if (count > dfil->todo)
1008                 count = dfil->todo;
1009         result = dvb_dmxdev_buffer_read(&dfil->buffer,
1010                                         file->f_flags & O_NONBLOCK,
1011                                         buf, count, ppos);
1012         if (result < 0)
1013                 return result;
1014         dfil->todo -= result;
1015         return (result + done);
1016 }
1017
1018 static ssize_t
1019 dvb_demux_read(struct file *file, char __user *buf, size_t count,
1020                loff_t *ppos)
1021 {
1022         struct dmxdev_filter *dmxdevfilter = file->private_data;
1023         int ret;
1024
1025         if (mutex_lock_interruptible(&dmxdevfilter->mutex))
1026                 return -ERESTARTSYS;
1027
1028         if (dmxdevfilter->type == DMXDEV_TYPE_SEC)
1029                 ret = dvb_dmxdev_read_sec(dmxdevfilter, file, buf, count, ppos);
1030         else
1031                 ret = dvb_dmxdev_buffer_read(&dmxdevfilter->buffer,
1032                                              file->f_flags & O_NONBLOCK,
1033                                              buf, count, ppos);
1034
1035         mutex_unlock(&dmxdevfilter->mutex);
1036         return ret;
1037 }
1038
1039 static int dvb_demux_do_ioctl(struct file *file,
1040                               unsigned int cmd, void *parg)
1041 {
1042         struct dmxdev_filter *dmxdevfilter = file->private_data;
1043         struct dmxdev *dmxdev = dmxdevfilter->dev;
1044         unsigned long arg = (unsigned long)parg;
1045         int ret = 0;
1046
1047         if (mutex_lock_interruptible(&dmxdev->mutex))
1048                 return -ERESTARTSYS;
1049
1050         switch (cmd) {
1051         case DMX_START:
1052                 if (mutex_lock_interruptible(&dmxdevfilter->mutex)) {
1053                         mutex_unlock(&dmxdev->mutex);
1054                         return -ERESTARTSYS;
1055                 }
1056                 if (dmxdevfilter->state < DMXDEV_STATE_SET)
1057                         ret = -EINVAL;
1058                 else
1059                         ret = dvb_dmxdev_filter_start(dmxdevfilter);
1060                 mutex_unlock(&dmxdevfilter->mutex);
1061                 break;
1062
1063         case DMX_STOP:
1064                 if (mutex_lock_interruptible(&dmxdevfilter->mutex)) {
1065                         mutex_unlock(&dmxdev->mutex);
1066                         return -ERESTARTSYS;
1067                 }
1068                 ret = dvb_dmxdev_filter_stop(dmxdevfilter);
1069                 mutex_unlock(&dmxdevfilter->mutex);
1070                 break;
1071
1072         case DMX_SET_FILTER:
1073                 if (mutex_lock_interruptible(&dmxdevfilter->mutex)) {
1074                         mutex_unlock(&dmxdev->mutex);
1075                         return -ERESTARTSYS;
1076                 }
1077                 ret = dvb_dmxdev_filter_set(dmxdev, dmxdevfilter, parg);
1078                 mutex_unlock(&dmxdevfilter->mutex);
1079                 break;
1080
1081         case DMX_SET_PES_FILTER:
1082                 if (mutex_lock_interruptible(&dmxdevfilter->mutex)) {
1083                         mutex_unlock(&dmxdev->mutex);
1084                         return -ERESTARTSYS;
1085                 }
1086                 ret = dvb_dmxdev_pes_filter_set(dmxdev, dmxdevfilter, parg);
1087                 mutex_unlock(&dmxdevfilter->mutex);
1088                 break;
1089
1090         case DMX_SET_BUFFER_SIZE:
1091                 if (mutex_lock_interruptible(&dmxdevfilter->mutex)) {
1092                         mutex_unlock(&dmxdev->mutex);
1093                         return -ERESTARTSYS;
1094                 }
1095                 ret = dvb_dmxdev_set_buffer_size(dmxdevfilter, arg);
1096                 mutex_unlock(&dmxdevfilter->mutex);
1097                 break;
1098
1099         case DMX_GET_PES_PIDS:
1100                 if (!dmxdev->demux->get_pes_pids) {
1101                         ret = -EINVAL;
1102                         break;
1103                 }
1104                 dmxdev->demux->get_pes_pids(dmxdev->demux, parg);
1105                 break;
1106
1107         case DMX_GET_STC:
1108                 if (!dmxdev->demux->get_stc) {
1109                         ret = -EINVAL;
1110                         break;
1111                 }
1112                 ret = dmxdev->demux->get_stc(dmxdev->demux,
1113                                              ((struct dmx_stc *)parg)->num,
1114                                              &((struct dmx_stc *)parg)->stc,
1115                                              &((struct dmx_stc *)parg)->base);
1116                 break;
1117
1118         case DMX_ADD_PID:
1119                 if (mutex_lock_interruptible(&dmxdevfilter->mutex)) {
1120                         ret = -ERESTARTSYS;
1121                         break;
1122                 }
1123                 ret = dvb_dmxdev_add_pid(dmxdev, dmxdevfilter, *(u16 *)parg);
1124                 mutex_unlock(&dmxdevfilter->mutex);
1125                 break;
1126
1127         case DMX_REMOVE_PID:
1128                 if (mutex_lock_interruptible(&dmxdevfilter->mutex)) {
1129                         ret = -ERESTARTSYS;
1130                         break;
1131                 }
1132                 ret = dvb_dmxdev_remove_pid(dmxdev, dmxdevfilter, *(u16 *)parg);
1133                 mutex_unlock(&dmxdevfilter->mutex);
1134                 break;
1135
1136 #ifdef CONFIG_DVB_MMAP
1137         case DMX_REQBUFS:
1138                 if (mutex_lock_interruptible(&dmxdevfilter->mutex)) {
1139                         mutex_unlock(&dmxdev->mutex);
1140                         return -ERESTARTSYS;
1141                 }
1142                 ret = dvb_vb2_reqbufs(&dmxdevfilter->vb2_ctx, parg);
1143                 mutex_unlock(&dmxdevfilter->mutex);
1144                 break;
1145
1146         case DMX_QUERYBUF:
1147                 if (mutex_lock_interruptible(&dmxdevfilter->mutex)) {
1148                         mutex_unlock(&dmxdev->mutex);
1149                         return -ERESTARTSYS;
1150                 }
1151                 ret = dvb_vb2_querybuf(&dmxdevfilter->vb2_ctx, parg);
1152                 mutex_unlock(&dmxdevfilter->mutex);
1153                 break;
1154
1155         case DMX_EXPBUF:
1156                 if (mutex_lock_interruptible(&dmxdevfilter->mutex)) {
1157                         mutex_unlock(&dmxdev->mutex);
1158                         return -ERESTARTSYS;
1159                 }
1160                 ret = dvb_vb2_expbuf(&dmxdevfilter->vb2_ctx, parg);
1161                 mutex_unlock(&dmxdevfilter->mutex);
1162                 break;
1163
1164         case DMX_QBUF:
1165                 if (mutex_lock_interruptible(&dmxdevfilter->mutex)) {
1166                         mutex_unlock(&dmxdev->mutex);
1167                         return -ERESTARTSYS;
1168                 }
1169                 ret = dvb_vb2_qbuf(&dmxdevfilter->vb2_ctx, parg);
1170                 if (ret == 0 && !dvb_vb2_is_streaming(&dmxdevfilter->vb2_ctx))
1171                         ret = dvb_vb2_stream_on(&dmxdevfilter->vb2_ctx);
1172                 mutex_unlock(&dmxdevfilter->mutex);
1173                 break;
1174
1175         case DMX_DQBUF:
1176                 if (mutex_lock_interruptible(&dmxdevfilter->mutex)) {
1177                         mutex_unlock(&dmxdev->mutex);
1178                         return -ERESTARTSYS;
1179                 }
1180                 ret = dvb_vb2_dqbuf(&dmxdevfilter->vb2_ctx, parg);
1181                 mutex_unlock(&dmxdevfilter->mutex);
1182                 break;
1183 #endif
1184         default:
1185                 ret = -ENOTTY;
1186                 break;
1187         }
1188         mutex_unlock(&dmxdev->mutex);
1189         return ret;
1190 }
1191
1192 static long dvb_demux_ioctl(struct file *file, unsigned int cmd,
1193                             unsigned long arg)
1194 {
1195         return dvb_usercopy(file, cmd, arg, dvb_demux_do_ioctl);
1196 }
1197
1198 static __poll_t dvb_demux_poll(struct file *file, poll_table *wait)
1199 {
1200         struct dmxdev_filter *dmxdevfilter = file->private_data;
1201         __poll_t mask = 0;
1202
1203         if ((!dmxdevfilter) || dmxdevfilter->dev->exit)
1204                 return EPOLLERR;
1205         if (dvb_vb2_is_streaming(&dmxdevfilter->vb2_ctx))
1206                 return dvb_vb2_poll(&dmxdevfilter->vb2_ctx, file, wait);
1207
1208         poll_wait(file, &dmxdevfilter->buffer.queue, wait);
1209
1210         if (dmxdevfilter->state != DMXDEV_STATE_GO &&
1211             dmxdevfilter->state != DMXDEV_STATE_DONE &&
1212             dmxdevfilter->state != DMXDEV_STATE_TIMEDOUT)
1213                 return 0;
1214
1215         if (dmxdevfilter->buffer.error)
1216                 mask |= (EPOLLIN | EPOLLRDNORM | EPOLLPRI | EPOLLERR);
1217
1218         if (!dvb_ringbuffer_empty(&dmxdevfilter->buffer))
1219                 mask |= (EPOLLIN | EPOLLRDNORM | EPOLLPRI);
1220
1221         return mask;
1222 }
1223
1224 #ifdef CONFIG_DVB_MMAP
1225 static int dvb_demux_mmap(struct file *file, struct vm_area_struct *vma)
1226 {
1227         struct dmxdev_filter *dmxdevfilter = file->private_data;
1228         struct dmxdev *dmxdev = dmxdevfilter->dev;
1229         int ret;
1230
1231         if (!dmxdev->may_do_mmap)
1232                 return -ENOTTY;
1233
1234         if (mutex_lock_interruptible(&dmxdev->mutex))
1235                 return -ERESTARTSYS;
1236
1237         if (mutex_lock_interruptible(&dmxdevfilter->mutex)) {
1238                 mutex_unlock(&dmxdev->mutex);
1239                 return -ERESTARTSYS;
1240         }
1241         ret = dvb_vb2_mmap(&dmxdevfilter->vb2_ctx, vma);
1242
1243         mutex_unlock(&dmxdevfilter->mutex);
1244         mutex_unlock(&dmxdev->mutex);
1245
1246         return ret;
1247 }
1248 #endif
1249
1250 static int dvb_demux_release(struct inode *inode, struct file *file)
1251 {
1252         struct dmxdev_filter *dmxdevfilter = file->private_data;
1253         struct dmxdev *dmxdev = dmxdevfilter->dev;
1254         int ret;
1255
1256         ret = dvb_dmxdev_filter_free(dmxdev, dmxdevfilter);
1257
1258         mutex_lock(&dmxdev->mutex);
1259         dmxdev->dvbdev->users--;
1260         if (dmxdev->dvbdev->users == 1 && dmxdev->exit == 1) {
1261                 mutex_unlock(&dmxdev->mutex);
1262                 wake_up(&dmxdev->dvbdev->wait_queue);
1263         } else
1264                 mutex_unlock(&dmxdev->mutex);
1265
1266         return ret;
1267 }
1268
1269 static const struct file_operations dvb_demux_fops = {
1270         .owner = THIS_MODULE,
1271         .read = dvb_demux_read,
1272         .unlocked_ioctl = dvb_demux_ioctl,
1273         .open = dvb_demux_open,
1274         .release = dvb_demux_release,
1275         .poll = dvb_demux_poll,
1276         .llseek = default_llseek,
1277 #ifdef CONFIG_DVB_MMAP
1278         .mmap = dvb_demux_mmap,
1279 #endif
1280 };
1281
1282 static const struct dvb_device dvbdev_demux = {
1283         .priv = NULL,
1284         .users = 1,
1285         .writers = 1,
1286 #if defined(CONFIG_MEDIA_CONTROLLER_DVB)
1287         .name = "dvb-demux",
1288 #endif
1289         .fops = &dvb_demux_fops
1290 };
1291
1292 static int dvb_dvr_do_ioctl(struct file *file,
1293                             unsigned int cmd, void *parg)
1294 {
1295         struct dvb_device *dvbdev = file->private_data;
1296         struct dmxdev *dmxdev = dvbdev->priv;
1297         unsigned long arg = (unsigned long)parg;
1298         int ret;
1299
1300         if (mutex_lock_interruptible(&dmxdev->mutex))
1301                 return -ERESTARTSYS;
1302
1303         switch (cmd) {
1304         case DMX_SET_BUFFER_SIZE:
1305                 ret = dvb_dvr_set_buffer_size(dmxdev, arg);
1306                 break;
1307
1308 #ifdef CONFIG_DVB_MMAP
1309         case DMX_REQBUFS:
1310                 ret = dvb_vb2_reqbufs(&dmxdev->dvr_vb2_ctx, parg);
1311                 break;
1312
1313         case DMX_QUERYBUF:
1314                 ret = dvb_vb2_querybuf(&dmxdev->dvr_vb2_ctx, parg);
1315                 break;
1316
1317         case DMX_EXPBUF:
1318                 ret = dvb_vb2_expbuf(&dmxdev->dvr_vb2_ctx, parg);
1319                 break;
1320
1321         case DMX_QBUF:
1322                 ret = dvb_vb2_qbuf(&dmxdev->dvr_vb2_ctx, parg);
1323                 if (ret == 0 && !dvb_vb2_is_streaming(&dmxdev->dvr_vb2_ctx))
1324                         ret = dvb_vb2_stream_on(&dmxdev->dvr_vb2_ctx);
1325                 break;
1326
1327         case DMX_DQBUF:
1328                 ret = dvb_vb2_dqbuf(&dmxdev->dvr_vb2_ctx, parg);
1329                 break;
1330 #endif
1331         default:
1332                 ret = -ENOTTY;
1333                 break;
1334         }
1335         mutex_unlock(&dmxdev->mutex);
1336         return ret;
1337 }
1338
1339 static long dvb_dvr_ioctl(struct file *file,
1340                          unsigned int cmd, unsigned long arg)
1341 {
1342         return dvb_usercopy(file, cmd, arg, dvb_dvr_do_ioctl);
1343 }
1344
1345 static __poll_t dvb_dvr_poll(struct file *file, poll_table *wait)
1346 {
1347         struct dvb_device *dvbdev = file->private_data;
1348         struct dmxdev *dmxdev = dvbdev->priv;
1349         __poll_t mask = 0;
1350
1351         dprintk("%s\n", __func__);
1352
1353         if (dmxdev->exit)
1354                 return EPOLLERR;
1355         if (dvb_vb2_is_streaming(&dmxdev->dvr_vb2_ctx))
1356                 return dvb_vb2_poll(&dmxdev->dvr_vb2_ctx, file, wait);
1357
1358         poll_wait(file, &dmxdev->dvr_buffer.queue, wait);
1359
1360         if (((file->f_flags & O_ACCMODE) == O_RDONLY) ||
1361             dmxdev->may_do_mmap) {
1362                 if (dmxdev->dvr_buffer.error)
1363                         mask |= (EPOLLIN | EPOLLRDNORM | EPOLLPRI | EPOLLERR);
1364
1365                 if (!dvb_ringbuffer_empty(&dmxdev->dvr_buffer))
1366                         mask |= (EPOLLIN | EPOLLRDNORM | EPOLLPRI);
1367         } else
1368                 mask |= (EPOLLOUT | EPOLLWRNORM | EPOLLPRI);
1369
1370         return mask;
1371 }
1372
1373 #ifdef CONFIG_DVB_MMAP
1374 static int dvb_dvr_mmap(struct file *file, struct vm_area_struct *vma)
1375 {
1376         struct dvb_device *dvbdev = file->private_data;
1377         struct dmxdev *dmxdev = dvbdev->priv;
1378         int ret;
1379
1380         if (!dmxdev->may_do_mmap)
1381                 return -ENOTTY;
1382
1383         if (dmxdev->exit)
1384                 return -ENODEV;
1385
1386         if (mutex_lock_interruptible(&dmxdev->mutex))
1387                 return -ERESTARTSYS;
1388
1389         ret = dvb_vb2_mmap(&dmxdev->dvr_vb2_ctx, vma);
1390         mutex_unlock(&dmxdev->mutex);
1391         return ret;
1392 }
1393 #endif
1394
1395 static const struct file_operations dvb_dvr_fops = {
1396         .owner = THIS_MODULE,
1397         .read = dvb_dvr_read,
1398         .write = dvb_dvr_write,
1399         .unlocked_ioctl = dvb_dvr_ioctl,
1400         .open = dvb_dvr_open,
1401         .release = dvb_dvr_release,
1402         .poll = dvb_dvr_poll,
1403         .llseek = default_llseek,
1404 #ifdef CONFIG_DVB_MMAP
1405         .mmap = dvb_dvr_mmap,
1406 #endif
1407 };
1408
1409 static const struct dvb_device dvbdev_dvr = {
1410         .priv = NULL,
1411         .readers = 1,
1412         .users = 1,
1413 #if defined(CONFIG_MEDIA_CONTROLLER_DVB)
1414         .name = "dvb-dvr",
1415 #endif
1416         .fops = &dvb_dvr_fops
1417 };
1418 int dvb_dmxdev_init(struct dmxdev *dmxdev, struct dvb_adapter *dvb_adapter)
1419 {
1420         int i, ret;
1421
1422         if (dmxdev->demux->open(dmxdev->demux) < 0)
1423                 return -EUSERS;
1424
1425         dmxdev->filter = vmalloc(array_size(sizeof(struct dmxdev_filter),
1426                                             dmxdev->filternum));
1427         if (!dmxdev->filter)
1428                 return -ENOMEM;
1429
1430         mutex_init(&dmxdev->mutex);
1431         spin_lock_init(&dmxdev->lock);
1432         for (i = 0; i < dmxdev->filternum; i++) {
1433                 dmxdev->filter[i].dev = dmxdev;
1434                 dmxdev->filter[i].buffer.data = NULL;
1435                 dvb_dmxdev_filter_state_set(&dmxdev->filter[i],
1436                                             DMXDEV_STATE_FREE);
1437         }
1438
1439         ret = dvb_register_device(dvb_adapter, &dmxdev->dvbdev, &dvbdev_demux, dmxdev,
1440                             DVB_DEVICE_DEMUX, dmxdev->filternum);
1441         if (ret < 0)
1442                 goto err_register_dvbdev;
1443
1444         ret = dvb_register_device(dvb_adapter, &dmxdev->dvr_dvbdev, &dvbdev_dvr,
1445                             dmxdev, DVB_DEVICE_DVR, dmxdev->filternum);
1446         if (ret < 0)
1447                 goto err_register_dvr_dvbdev;
1448
1449         dvb_ringbuffer_init(&dmxdev->dvr_buffer, NULL, 8192);
1450
1451         return 0;
1452
1453 err_register_dvr_dvbdev:
1454         dvb_unregister_device(dmxdev->dvbdev);
1455 err_register_dvbdev:
1456         vfree(dmxdev->filter);
1457         dmxdev->filter = NULL;
1458         return ret;
1459 }
1460
1461 EXPORT_SYMBOL(dvb_dmxdev_init);
1462
1463 void dvb_dmxdev_release(struct dmxdev *dmxdev)
1464 {
1465         mutex_lock(&dmxdev->mutex);
1466         dmxdev->exit = 1;
1467         mutex_unlock(&dmxdev->mutex);
1468
1469         if (dmxdev->dvbdev->users > 1) {
1470                 wait_event(dmxdev->dvbdev->wait_queue,
1471                                 dmxdev->dvbdev->users == 1);
1472         }
1473         if (dmxdev->dvr_dvbdev->users > 1) {
1474                 wait_event(dmxdev->dvr_dvbdev->wait_queue,
1475                                 dmxdev->dvr_dvbdev->users == 1);
1476         }
1477
1478         dvb_unregister_device(dmxdev->dvbdev);
1479         dvb_unregister_device(dmxdev->dvr_dvbdev);
1480
1481         vfree(dmxdev->filter);
1482         dmxdev->filter = NULL;
1483         dmxdev->demux->close(dmxdev->demux);
1484 }
1485
1486 EXPORT_SYMBOL(dvb_dmxdev_release);