1 // SPDX-License-Identifier: LGPL-2.1-or-later
2 /*
3 * dmxdev.c - DVB demultiplexer device
4 *
5 * Copyright (C) 2000 Ralph Metzler & Marcus Metzler
6 * for convergence integrated media GmbH
7 */
8
9 #define pr_fmt(fmt) "dmxdev: " fmt
10
11 #include <linux/sched.h>
12 #include <linux/spinlock.h>
13 #include <linux/slab.h>
14 #include <linux/vmalloc.h>
15 #include <linux/module.h>
16 #include <linux/poll.h>
17 #include <linux/ioctl.h>
18 #include <linux/wait.h>
19 #include <linux/uaccess.h>
20 #include <media/dmxdev.h>
21 #include <media/dvb_vb2.h>
22
23 static int debug;
24
25 module_param(debug, int, 0644);
26 MODULE_PARM_DESC(debug, "Turn on/off debugging (default:off).");
27
28 #define dprintk(fmt, arg...) do { \
29 if (debug) \
30 printk(KERN_DEBUG pr_fmt("%s: " fmt), \
31 __func__, ##arg); \
32 } while (0)
33
dvb_dmxdev_buffer_write(struct dvb_ringbuffer * buf,const u8 * src,size_t len)34 static int dvb_dmxdev_buffer_write(struct dvb_ringbuffer *buf,
35 const u8 *src, size_t len)
36 {
37 ssize_t free;
38
39 if (!len)
40 return 0;
41 if (!buf->data)
42 return 0;
43
44 free = dvb_ringbuffer_free(buf);
45 if (len > free) {
46 dprintk("buffer overflow\n");
47 return -EOVERFLOW;
48 }
49
50 return dvb_ringbuffer_write(buf, src, len);
51 }
52
dvb_dmxdev_buffer_read(struct dvb_ringbuffer * src,int non_blocking,char __user * buf,size_t count,loff_t * ppos)53 static ssize_t dvb_dmxdev_buffer_read(struct dvb_ringbuffer *src,
54 int non_blocking, char __user *buf,
55 size_t count, loff_t *ppos)
56 {
57 size_t todo;
58 ssize_t avail;
59 ssize_t ret = 0;
60
61 if (!src->data)
62 return 0;
63
64 if (src->error) {
65 ret = src->error;
66 dvb_ringbuffer_flush(src);
67 return ret;
68 }
69
70 for (todo = count; todo > 0; todo -= ret) {
71 if (non_blocking && dvb_ringbuffer_empty(src)) {
72 ret = -EWOULDBLOCK;
73 break;
74 }
75
76 ret = wait_event_interruptible(src->queue,
77 !dvb_ringbuffer_empty(src) ||
78 (src->error != 0));
79 if (ret < 0)
80 break;
81
82 if (src->error) {
83 ret = src->error;
84 dvb_ringbuffer_flush(src);
85 break;
86 }
87
88 avail = dvb_ringbuffer_avail(src);
89 if (avail > todo)
90 avail = todo;
91
92 ret = dvb_ringbuffer_read_user(src, buf, avail);
93 if (ret < 0)
94 break;
95
96 buf += ret;
97 }
98
99 return (count - todo) ? (count - todo) : ret;
100 }
101
get_fe(struct dmx_demux * demux,int type)102 static struct dmx_frontend *get_fe(struct dmx_demux *demux, int type)
103 {
104 struct list_head *head, *pos;
105
106 head = demux->get_frontends(demux);
107 if (!head)
108 return NULL;
109 list_for_each(pos, head)
110 if (DMX_FE_ENTRY(pos)->source == type)
111 return DMX_FE_ENTRY(pos);
112
113 return NULL;
114 }
115
dvb_dvr_open(struct inode * inode,struct file * file)116 static int dvb_dvr_open(struct inode *inode, struct file *file)
117 {
118 struct dvb_device *dvbdev = file->private_data;
119 struct dmxdev *dmxdev = dvbdev->priv;
120 struct dmx_frontend *front;
121 bool need_ringbuffer = false;
122
123 dprintk("%s\n", __func__);
124
125 if (mutex_lock_interruptible(&dmxdev->mutex))
126 return -ERESTARTSYS;
127
128 if (dmxdev->exit) {
129 mutex_unlock(&dmxdev->mutex);
130 return -ENODEV;
131 }
132
133 dmxdev->may_do_mmap = 0;
134
135 /*
136 * The logic here is a little tricky due to the ifdef.
137 *
138 * The ringbuffer is used for both read and mmap.
139 *
140 * It is not needed, however, on two situations:
141 * - Write devices (access with O_WRONLY);
142 * - For duplex device nodes, opened with O_RDWR.
143 */
144
145 if ((file->f_flags & O_ACCMODE) == O_RDONLY)
146 need_ringbuffer = true;
147 else if ((file->f_flags & O_ACCMODE) == O_RDWR) {
148 if (!(dmxdev->capabilities & DMXDEV_CAP_DUPLEX)) {
149 #ifdef CONFIG_DVB_MMAP
150 dmxdev->may_do_mmap = 1;
151 need_ringbuffer = true;
152 #else
153 mutex_unlock(&dmxdev->mutex);
154 return -EOPNOTSUPP;
155 #endif
156 }
157 }
158
159 if (need_ringbuffer) {
160 void *mem;
161
162 if (!dvbdev->readers) {
163 mutex_unlock(&dmxdev->mutex);
164 return -EBUSY;
165 }
166 mem = vmalloc(DVR_BUFFER_SIZE);
167 if (!mem) {
168 mutex_unlock(&dmxdev->mutex);
169 return -ENOMEM;
170 }
171 dvb_ringbuffer_init(&dmxdev->dvr_buffer, mem, DVR_BUFFER_SIZE);
172 if (dmxdev->may_do_mmap)
173 dvb_vb2_init(&dmxdev->dvr_vb2_ctx, "dvr",
174 file->f_flags & O_NONBLOCK);
175 dvbdev->readers--;
176 }
177
178 if ((file->f_flags & O_ACCMODE) == O_WRONLY) {
179 dmxdev->dvr_orig_fe = dmxdev->demux->frontend;
180
181 if (!dmxdev->demux->write) {
182 mutex_unlock(&dmxdev->mutex);
183 return -EOPNOTSUPP;
184 }
185
186 front = get_fe(dmxdev->demux, DMX_MEMORY_FE);
187
188 if (!front) {
189 mutex_unlock(&dmxdev->mutex);
190 return -EINVAL;
191 }
192 dmxdev->demux->disconnect_frontend(dmxdev->demux);
193 dmxdev->demux->connect_frontend(dmxdev->demux, front);
194 }
195 dvbdev->users++;
196 mutex_unlock(&dmxdev->mutex);
197 return 0;
198 }
199
dvb_dvr_release(struct inode * inode,struct file * file)200 static int dvb_dvr_release(struct inode *inode, struct file *file)
201 {
202 struct dvb_device *dvbdev = file->private_data;
203 struct dmxdev *dmxdev = dvbdev->priv;
204
205 mutex_lock(&dmxdev->mutex);
206
207 if ((file->f_flags & O_ACCMODE) == O_WRONLY) {
208 dmxdev->demux->disconnect_frontend(dmxdev->demux);
209 dmxdev->demux->connect_frontend(dmxdev->demux,
210 dmxdev->dvr_orig_fe);
211 }
212
213 if (((file->f_flags & O_ACCMODE) == O_RDONLY) ||
214 dmxdev->may_do_mmap) {
215 if (dmxdev->may_do_mmap) {
216 if (dvb_vb2_is_streaming(&dmxdev->dvr_vb2_ctx))
217 dvb_vb2_stream_off(&dmxdev->dvr_vb2_ctx);
218 dvb_vb2_release(&dmxdev->dvr_vb2_ctx);
219 }
220 dvbdev->readers++;
221 if (dmxdev->dvr_buffer.data) {
222 void *mem = dmxdev->dvr_buffer.data;
223 /*memory barrier*/
224 mb();
225 spin_lock_irq(&dmxdev->lock);
226 dmxdev->dvr_buffer.data = NULL;
227 spin_unlock_irq(&dmxdev->lock);
228 vfree(mem);
229 }
230 }
231 /* TODO */
232 dvbdev->users--;
233 if (dvbdev->users == 1 && dmxdev->exit == 1) {
234 mutex_unlock(&dmxdev->mutex);
235 wake_up(&dvbdev->wait_queue);
236 } else
237 mutex_unlock(&dmxdev->mutex);
238
239 return 0;
240 }
241
dvb_dvr_write(struct file * file,const char __user * buf,size_t count,loff_t * ppos)242 static ssize_t dvb_dvr_write(struct file *file, const char __user *buf,
243 size_t count, loff_t *ppos)
244 {
245 struct dvb_device *dvbdev = file->private_data;
246 struct dmxdev *dmxdev = dvbdev->priv;
247 int ret;
248
249 if (!dmxdev->demux->write)
250 return -EOPNOTSUPP;
251 if ((file->f_flags & O_ACCMODE) != O_WRONLY)
252 return -EINVAL;
253 if (mutex_lock_interruptible(&dmxdev->mutex))
254 return -ERESTARTSYS;
255
256 if (dmxdev->exit) {
257 mutex_unlock(&dmxdev->mutex);
258 return -ENODEV;
259 }
260 ret = dmxdev->demux->write(dmxdev->demux, buf, count);
261 mutex_unlock(&dmxdev->mutex);
262 return ret;
263 }
264
dvb_dvr_read(struct file * file,char __user * buf,size_t count,loff_t * ppos)265 static ssize_t dvb_dvr_read(struct file *file, char __user *buf, size_t count,
266 loff_t *ppos)
267 {
268 struct dvb_device *dvbdev = file->private_data;
269 struct dmxdev *dmxdev = dvbdev->priv;
270
271 if (dmxdev->exit)
272 return -ENODEV;
273
274 return dvb_dmxdev_buffer_read(&dmxdev->dvr_buffer,
275 file->f_flags & O_NONBLOCK,
276 buf, count, ppos);
277 }
278
dvb_dvr_set_buffer_size(struct dmxdev * dmxdev,unsigned long size)279 static int dvb_dvr_set_buffer_size(struct dmxdev *dmxdev,
280 unsigned long size)
281 {
282 struct dvb_ringbuffer *buf = &dmxdev->dvr_buffer;
283 void *newmem;
284 void *oldmem;
285
286 dprintk("%s\n", __func__);
287
288 if (buf->size == size)
289 return 0;
290 if (!size)
291 return -EINVAL;
292
293 newmem = vmalloc(size);
294 if (!newmem)
295 return -ENOMEM;
296
297 oldmem = buf->data;
298
299 spin_lock_irq(&dmxdev->lock);
300 buf->data = newmem;
301 buf->size = size;
302
303 /* reset and not flush in case the buffer shrinks */
304 dvb_ringbuffer_reset(buf);
305 spin_unlock_irq(&dmxdev->lock);
306
307 vfree(oldmem);
308
309 return 0;
310 }
311
dvb_dmxdev_filter_state_set(struct dmxdev_filter * dmxdevfilter,int state)312 static inline void dvb_dmxdev_filter_state_set(struct dmxdev_filter
313 *dmxdevfilter, int state)
314 {
315 spin_lock_irq(&dmxdevfilter->dev->lock);
316 dmxdevfilter->state = state;
317 spin_unlock_irq(&dmxdevfilter->dev->lock);
318 }
319
dvb_dmxdev_set_buffer_size(struct dmxdev_filter * dmxdevfilter,unsigned long size)320 static int dvb_dmxdev_set_buffer_size(struct dmxdev_filter *dmxdevfilter,
321 unsigned long size)
322 {
323 struct dvb_ringbuffer *buf = &dmxdevfilter->buffer;
324 void *newmem;
325 void *oldmem;
326
327 if (buf->size == size)
328 return 0;
329 if (!size)
330 return -EINVAL;
331 if (dmxdevfilter->state >= DMXDEV_STATE_GO)
332 return -EBUSY;
333
334 newmem = vmalloc(size);
335 if (!newmem)
336 return -ENOMEM;
337
338 oldmem = buf->data;
339
340 spin_lock_irq(&dmxdevfilter->dev->lock);
341 buf->data = newmem;
342 buf->size = size;
343
344 /* reset and not flush in case the buffer shrinks */
345 dvb_ringbuffer_reset(buf);
346 spin_unlock_irq(&dmxdevfilter->dev->lock);
347
348 vfree(oldmem);
349
350 return 0;
351 }
352
dvb_dmxdev_filter_timeout(struct timer_list * t)353 static void dvb_dmxdev_filter_timeout(struct timer_list *t)
354 {
355 struct dmxdev_filter *dmxdevfilter = from_timer(dmxdevfilter, t, timer);
356
357 dmxdevfilter->buffer.error = -ETIMEDOUT;
358 spin_lock_irq(&dmxdevfilter->dev->lock);
359 dmxdevfilter->state = DMXDEV_STATE_TIMEDOUT;
360 spin_unlock_irq(&dmxdevfilter->dev->lock);
361 wake_up(&dmxdevfilter->buffer.queue);
362 }
363
dvb_dmxdev_filter_timer(struct dmxdev_filter * dmxdevfilter)364 static void dvb_dmxdev_filter_timer(struct dmxdev_filter *dmxdevfilter)
365 {
366 struct dmx_sct_filter_params *para = &dmxdevfilter->params.sec;
367
368 del_timer(&dmxdevfilter->timer);
369 if (para->timeout) {
370 dmxdevfilter->timer.expires =
371 jiffies + 1 + (HZ / 2 + HZ * para->timeout) / 1000;
372 add_timer(&dmxdevfilter->timer);
373 }
374 }
375
dvb_dmxdev_section_callback(const u8 * buffer1,size_t buffer1_len,const u8 * buffer2,size_t buffer2_len,struct dmx_section_filter * filter,u32 * buffer_flags)376 static int dvb_dmxdev_section_callback(const u8 *buffer1, size_t buffer1_len,
377 const u8 *buffer2, size_t buffer2_len,
378 struct dmx_section_filter *filter,
379 u32 *buffer_flags)
380 {
381 struct dmxdev_filter *dmxdevfilter = filter->priv;
382 int ret;
383
384 if (!dvb_vb2_is_streaming(&dmxdevfilter->vb2_ctx) &&
385 dmxdevfilter->buffer.error) {
386 wake_up(&dmxdevfilter->buffer.queue);
387 return 0;
388 }
389 spin_lock(&dmxdevfilter->dev->lock);
390 if (dmxdevfilter->state != DMXDEV_STATE_GO) {
391 spin_unlock(&dmxdevfilter->dev->lock);
392 return 0;
393 }
394 del_timer(&dmxdevfilter->timer);
395 dprintk("section callback %*ph\n", 6, buffer1);
396 if (dvb_vb2_is_streaming(&dmxdevfilter->vb2_ctx)) {
397 ret = dvb_vb2_fill_buffer(&dmxdevfilter->vb2_ctx,
398 buffer1, buffer1_len,
399 buffer_flags);
400 if (ret == buffer1_len)
401 ret = dvb_vb2_fill_buffer(&dmxdevfilter->vb2_ctx,
402 buffer2, buffer2_len,
403 buffer_flags);
404 } else {
405 ret = dvb_dmxdev_buffer_write(&dmxdevfilter->buffer,
406 buffer1, buffer1_len);
407 if (ret == buffer1_len) {
408 ret = dvb_dmxdev_buffer_write(&dmxdevfilter->buffer,
409 buffer2, buffer2_len);
410 }
411 }
412 if (ret < 0)
413 dmxdevfilter->buffer.error = ret;
414 if (dmxdevfilter->params.sec.flags & DMX_ONESHOT)
415 dmxdevfilter->state = DMXDEV_STATE_DONE;
416 spin_unlock(&dmxdevfilter->dev->lock);
417 wake_up(&dmxdevfilter->buffer.queue);
418 return 0;
419 }
420
dvb_dmxdev_ts_callback(const u8 * buffer1,size_t buffer1_len,const u8 * buffer2,size_t buffer2_len,struct dmx_ts_feed * feed,u32 * buffer_flags)421 static int dvb_dmxdev_ts_callback(const u8 *buffer1, size_t buffer1_len,
422 const u8 *buffer2, size_t buffer2_len,
423 struct dmx_ts_feed *feed,
424 u32 *buffer_flags)
425 {
426 struct dmxdev_filter *dmxdevfilter = feed->priv;
427 struct dvb_ringbuffer *buffer;
428 #ifdef CONFIG_DVB_MMAP
429 struct dvb_vb2_ctx *ctx;
430 #endif
431 int ret;
432
433 spin_lock(&dmxdevfilter->dev->lock);
434 if (dmxdevfilter->params.pes.output == DMX_OUT_DECODER) {
435 spin_unlock(&dmxdevfilter->dev->lock);
436 return 0;
437 }
438
439 if (dmxdevfilter->params.pes.output == DMX_OUT_TAP ||
440 dmxdevfilter->params.pes.output == DMX_OUT_TSDEMUX_TAP) {
441 buffer = &dmxdevfilter->buffer;
442 #ifdef CONFIG_DVB_MMAP
443 ctx = &dmxdevfilter->vb2_ctx;
444 #endif
445 } else {
446 buffer = &dmxdevfilter->dev->dvr_buffer;
447 #ifdef CONFIG_DVB_MMAP
448 ctx = &dmxdevfilter->dev->dvr_vb2_ctx;
449 #endif
450 }
451
452 if (dvb_vb2_is_streaming(ctx)) {
453 ret = dvb_vb2_fill_buffer(ctx, buffer1, buffer1_len,
454 buffer_flags);
455 if (ret == buffer1_len)
456 ret = dvb_vb2_fill_buffer(ctx, buffer2, buffer2_len,
457 buffer_flags);
458 } else {
459 if (buffer->error) {
460 spin_unlock(&dmxdevfilter->dev->lock);
461 wake_up(&buffer->queue);
462 return 0;
463 }
464 ret = dvb_dmxdev_buffer_write(buffer, buffer1, buffer1_len);
465 if (ret == buffer1_len)
466 ret = dvb_dmxdev_buffer_write(buffer,
467 buffer2, buffer2_len);
468 }
469 if (ret < 0)
470 buffer->error = ret;
471 spin_unlock(&dmxdevfilter->dev->lock);
472 wake_up(&buffer->queue);
473 return 0;
474 }
475
476 /* stop feed but only mark the specified filter as stopped (state set) */
dvb_dmxdev_feed_stop(struct dmxdev_filter * dmxdevfilter)477 static int dvb_dmxdev_feed_stop(struct dmxdev_filter *dmxdevfilter)
478 {
479 struct dmxdev_feed *feed;
480
481 dvb_dmxdev_filter_state_set(dmxdevfilter, DMXDEV_STATE_SET);
482
483 switch (dmxdevfilter->type) {
484 case DMXDEV_TYPE_SEC:
485 del_timer(&dmxdevfilter->timer);
486 dmxdevfilter->feed.sec->stop_filtering(dmxdevfilter->feed.sec);
487 break;
488 case DMXDEV_TYPE_PES:
489 list_for_each_entry(feed, &dmxdevfilter->feed.ts, next)
490 feed->ts->stop_filtering(feed->ts);
491 break;
492 default:
493 return -EINVAL;
494 }
495 return 0;
496 }
497
498 /* start feed associated with the specified filter */
dvb_dmxdev_feed_start(struct dmxdev_filter * filter)499 static int dvb_dmxdev_feed_start(struct dmxdev_filter *filter)
500 {
501 struct dmxdev_feed *feed;
502 int ret;
503
504 dvb_dmxdev_filter_state_set(filter, DMXDEV_STATE_GO);
505
506 switch (filter->type) {
507 case DMXDEV_TYPE_SEC:
508 return filter->feed.sec->start_filtering(filter->feed.sec);
509 case DMXDEV_TYPE_PES:
510 list_for_each_entry(feed, &filter->feed.ts, next) {
511 ret = feed->ts->start_filtering(feed->ts);
512 if (ret < 0) {
513 dvb_dmxdev_feed_stop(filter);
514 return ret;
515 }
516 }
517 break;
518 default:
519 return -EINVAL;
520 }
521
522 return 0;
523 }
524
525 /* restart section feed if it has filters left associated with it,
526 otherwise release the feed */
dvb_dmxdev_feed_restart(struct dmxdev_filter * filter)527 static int dvb_dmxdev_feed_restart(struct dmxdev_filter *filter)
528 {
529 int i;
530 struct dmxdev *dmxdev = filter->dev;
531 u16 pid = filter->params.sec.pid;
532
533 for (i = 0; i < dmxdev->filternum; i++)
534 if (dmxdev->filter[i].state >= DMXDEV_STATE_GO &&
535 dmxdev->filter[i].type == DMXDEV_TYPE_SEC &&
536 dmxdev->filter[i].params.sec.pid == pid) {
537 dvb_dmxdev_feed_start(&dmxdev->filter[i]);
538 return 0;
539 }
540
541 filter->dev->demux->release_section_feed(dmxdev->demux,
542 filter->feed.sec);
543
544 return 0;
545 }
546
dvb_dmxdev_filter_stop(struct dmxdev_filter * dmxdevfilter)547 static int dvb_dmxdev_filter_stop(struct dmxdev_filter *dmxdevfilter)
548 {
549 struct dmxdev_feed *feed;
550 struct dmx_demux *demux;
551
552 if (dmxdevfilter->state < DMXDEV_STATE_GO)
553 return 0;
554
555 switch (dmxdevfilter->type) {
556 case DMXDEV_TYPE_SEC:
557 if (!dmxdevfilter->feed.sec)
558 break;
559 dvb_dmxdev_feed_stop(dmxdevfilter);
560 if (dmxdevfilter->filter.sec)
561 dmxdevfilter->feed.sec->
562 release_filter(dmxdevfilter->feed.sec,
563 dmxdevfilter->filter.sec);
564 dvb_dmxdev_feed_restart(dmxdevfilter);
565 dmxdevfilter->feed.sec = NULL;
566 break;
567 case DMXDEV_TYPE_PES:
568 dvb_dmxdev_feed_stop(dmxdevfilter);
569 demux = dmxdevfilter->dev->demux;
570 list_for_each_entry(feed, &dmxdevfilter->feed.ts, next) {
571 demux->release_ts_feed(demux, feed->ts);
572 feed->ts = NULL;
573 }
574 break;
575 default:
576 if (dmxdevfilter->state == DMXDEV_STATE_ALLOCATED)
577 return 0;
578 return -EINVAL;
579 }
580
581 dvb_ringbuffer_flush(&dmxdevfilter->buffer);
582 return 0;
583 }
584
dvb_dmxdev_delete_pids(struct dmxdev_filter * dmxdevfilter)585 static void dvb_dmxdev_delete_pids(struct dmxdev_filter *dmxdevfilter)
586 {
587 struct dmxdev_feed *feed, *tmp;
588
589 /* delete all PIDs */
590 list_for_each_entry_safe(feed, tmp, &dmxdevfilter->feed.ts, next) {
591 list_del(&feed->next);
592 kfree(feed);
593 }
594
595 BUG_ON(!list_empty(&dmxdevfilter->feed.ts));
596 }
597
dvb_dmxdev_filter_reset(struct dmxdev_filter * dmxdevfilter)598 static inline int dvb_dmxdev_filter_reset(struct dmxdev_filter *dmxdevfilter)
599 {
600 if (dmxdevfilter->state < DMXDEV_STATE_SET)
601 return 0;
602
603 if (dmxdevfilter->type == DMXDEV_TYPE_PES)
604 dvb_dmxdev_delete_pids(dmxdevfilter);
605
606 dmxdevfilter->type = DMXDEV_TYPE_NONE;
607 dvb_dmxdev_filter_state_set(dmxdevfilter, DMXDEV_STATE_ALLOCATED);
608 return 0;
609 }
610
dvb_dmxdev_start_feed(struct dmxdev * dmxdev,struct dmxdev_filter * filter,struct dmxdev_feed * feed)611 static int dvb_dmxdev_start_feed(struct dmxdev *dmxdev,
612 struct dmxdev_filter *filter,
613 struct dmxdev_feed *feed)
614 {
615 ktime_t timeout = ktime_set(0, 0);
616 struct dmx_pes_filter_params *para = &filter->params.pes;
617 enum dmx_output otype;
618 int ret;
619 int ts_type;
620 enum dmx_ts_pes ts_pes;
621 struct dmx_ts_feed *tsfeed;
622
623 feed->ts = NULL;
624 otype = para->output;
625
626 ts_pes = para->pes_type;
627
628 if (ts_pes < DMX_PES_OTHER)
629 ts_type = TS_DECODER;
630 else
631 ts_type = 0;
632
633 if (otype == DMX_OUT_TS_TAP)
634 ts_type |= TS_PACKET;
635 else if (otype == DMX_OUT_TSDEMUX_TAP)
636 ts_type |= TS_PACKET | TS_DEMUX;
637 else if (otype == DMX_OUT_TAP)
638 ts_type |= TS_PACKET | TS_DEMUX | TS_PAYLOAD_ONLY;
639
640 ret = dmxdev->demux->allocate_ts_feed(dmxdev->demux, &feed->ts,
641 dvb_dmxdev_ts_callback);
642 if (ret < 0)
643 return ret;
644
645 tsfeed = feed->ts;
646 tsfeed->priv = filter;
647
648 ret = tsfeed->set(tsfeed, feed->pid, ts_type, ts_pes, timeout);
649 if (ret < 0) {
650 dmxdev->demux->release_ts_feed(dmxdev->demux, tsfeed);
651 return ret;
652 }
653
654 ret = tsfeed->start_filtering(tsfeed);
655 if (ret < 0) {
656 dmxdev->demux->release_ts_feed(dmxdev->demux, tsfeed);
657 return ret;
658 }
659
660 return 0;
661 }
662
dvb_dmxdev_filter_start(struct dmxdev_filter * filter)663 static int dvb_dmxdev_filter_start(struct dmxdev_filter *filter)
664 {
665 struct dmxdev *dmxdev = filter->dev;
666 struct dmxdev_feed *feed;
667 void *mem;
668 int ret, i;
669
670 if (filter->state < DMXDEV_STATE_SET)
671 return -EINVAL;
672
673 if (filter->state >= DMXDEV_STATE_GO)
674 dvb_dmxdev_filter_stop(filter);
675
676 if (!filter->buffer.data) {
677 mem = vmalloc(filter->buffer.size);
678 if (!mem)
679 return -ENOMEM;
680 spin_lock_irq(&filter->dev->lock);
681 filter->buffer.data = mem;
682 spin_unlock_irq(&filter->dev->lock);
683 }
684
685 dvb_ringbuffer_flush(&filter->buffer);
686
687 switch (filter->type) {
688 case DMXDEV_TYPE_SEC:
689 {
690 struct dmx_sct_filter_params *para = &filter->params.sec;
691 struct dmx_section_filter **secfilter = &filter->filter.sec;
692 struct dmx_section_feed **secfeed = &filter->feed.sec;
693
694 *secfilter = NULL;
695 *secfeed = NULL;
696
697
698 /* find active filter/feed with same PID */
699 for (i = 0; i < dmxdev->filternum; i++) {
700 if (dmxdev->filter[i].state >= DMXDEV_STATE_GO &&
701 dmxdev->filter[i].type == DMXDEV_TYPE_SEC &&
702 dmxdev->filter[i].params.sec.pid == para->pid) {
703 *secfeed = dmxdev->filter[i].feed.sec;
704 break;
705 }
706 }
707
708 /* if no feed found, try to allocate new one */
709 if (!*secfeed) {
710 ret = dmxdev->demux->allocate_section_feed(dmxdev->demux,
711 secfeed,
712 dvb_dmxdev_section_callback);
713 if (!*secfeed) {
714 pr_err("DVB (%s): could not alloc feed\n",
715 __func__);
716 return ret;
717 }
718
719 ret = (*secfeed)->set(*secfeed, para->pid,
720 (para->flags & DMX_CHECK_CRC) ? 1 : 0);
721 if (ret < 0) {
722 pr_err("DVB (%s): could not set feed\n",
723 __func__);
724 dvb_dmxdev_feed_restart(filter);
725 return ret;
726 }
727 } else {
728 dvb_dmxdev_feed_stop(filter);
729 }
730
731 ret = (*secfeed)->allocate_filter(*secfeed, secfilter);
732 if (ret < 0) {
733 dvb_dmxdev_feed_restart(filter);
734 filter->feed.sec->start_filtering(*secfeed);
735 dprintk("could not get filter\n");
736 return ret;
737 }
738
739 (*secfilter)->priv = filter;
740
741 memcpy(&((*secfilter)->filter_value[3]),
742 &(para->filter.filter[1]), DMX_FILTER_SIZE - 1);
743 memcpy(&(*secfilter)->filter_mask[3],
744 ¶->filter.mask[1], DMX_FILTER_SIZE - 1);
745 memcpy(&(*secfilter)->filter_mode[3],
746 ¶->filter.mode[1], DMX_FILTER_SIZE - 1);
747
748 (*secfilter)->filter_value[0] = para->filter.filter[0];
749 (*secfilter)->filter_mask[0] = para->filter.mask[0];
750 (*secfilter)->filter_mode[0] = para->filter.mode[0];
751 (*secfilter)->filter_mask[1] = 0;
752 (*secfilter)->filter_mask[2] = 0;
753
754 filter->todo = 0;
755
756 ret = filter->feed.sec->start_filtering(filter->feed.sec);
757 if (ret < 0)
758 return ret;
759
760 dvb_dmxdev_filter_timer(filter);
761 break;
762 }
763 case DMXDEV_TYPE_PES:
764 list_for_each_entry(feed, &filter->feed.ts, next) {
765 ret = dvb_dmxdev_start_feed(dmxdev, filter, feed);
766 if (ret < 0) {
767 dvb_dmxdev_filter_stop(filter);
768 return ret;
769 }
770 }
771 break;
772 default:
773 return -EINVAL;
774 }
775
776 dvb_dmxdev_filter_state_set(filter, DMXDEV_STATE_GO);
777 return 0;
778 }
779
dvb_demux_open(struct inode * inode,struct file * file)780 static int dvb_demux_open(struct inode *inode, struct file *file)
781 {
782 struct dvb_device *dvbdev = file->private_data;
783 struct dmxdev *dmxdev = dvbdev->priv;
784 int i;
785 struct dmxdev_filter *dmxdevfilter;
786
787 if (!dmxdev->filter)
788 return -EINVAL;
789
790 if (mutex_lock_interruptible(&dmxdev->mutex))
791 return -ERESTARTSYS;
792
793 for (i = 0; i < dmxdev->filternum; i++)
794 if (dmxdev->filter[i].state == DMXDEV_STATE_FREE)
795 break;
796
797 if (i == dmxdev->filternum) {
798 mutex_unlock(&dmxdev->mutex);
799 return -EMFILE;
800 }
801
802 dmxdevfilter = &dmxdev->filter[i];
803 mutex_init(&dmxdevfilter->mutex);
804 file->private_data = dmxdevfilter;
805
806 #ifdef CONFIG_DVB_MMAP
807 dmxdev->may_do_mmap = 1;
808 #else
809 dmxdev->may_do_mmap = 0;
810 #endif
811
812 dvb_ringbuffer_init(&dmxdevfilter->buffer, NULL, 8192);
813 dvb_vb2_init(&dmxdevfilter->vb2_ctx, "demux_filter",
814 file->f_flags & O_NONBLOCK);
815 dmxdevfilter->type = DMXDEV_TYPE_NONE;
816 dvb_dmxdev_filter_state_set(dmxdevfilter, DMXDEV_STATE_ALLOCATED);
817 timer_setup(&dmxdevfilter->timer, dvb_dmxdev_filter_timeout, 0);
818
819 dvbdev->users++;
820
821 mutex_unlock(&dmxdev->mutex);
822 return 0;
823 }
824
dvb_dmxdev_filter_free(struct dmxdev * dmxdev,struct dmxdev_filter * dmxdevfilter)825 static int dvb_dmxdev_filter_free(struct dmxdev *dmxdev,
826 struct dmxdev_filter *dmxdevfilter)
827 {
828 mutex_lock(&dmxdev->mutex);
829 mutex_lock(&dmxdevfilter->mutex);
830 if (dvb_vb2_is_streaming(&dmxdevfilter->vb2_ctx))
831 dvb_vb2_stream_off(&dmxdevfilter->vb2_ctx);
832 dvb_vb2_release(&dmxdevfilter->vb2_ctx);
833
834
835 dvb_dmxdev_filter_stop(dmxdevfilter);
836 dvb_dmxdev_filter_reset(dmxdevfilter);
837
838 if (dmxdevfilter->buffer.data) {
839 void *mem = dmxdevfilter->buffer.data;
840
841 spin_lock_irq(&dmxdev->lock);
842 dmxdevfilter->buffer.data = NULL;
843 spin_unlock_irq(&dmxdev->lock);
844 vfree(mem);
845 }
846
847 dvb_dmxdev_filter_state_set(dmxdevfilter, DMXDEV_STATE_FREE);
848 wake_up(&dmxdevfilter->buffer.queue);
849 mutex_unlock(&dmxdevfilter->mutex);
850 mutex_unlock(&dmxdev->mutex);
851 return 0;
852 }
853
invert_mode(struct dmx_filter * filter)854 static inline void invert_mode(struct dmx_filter *filter)
855 {
856 int i;
857
858 for (i = 0; i < DMX_FILTER_SIZE; i++)
859 filter->mode[i] ^= 0xff;
860 }
861
dvb_dmxdev_add_pid(struct dmxdev * dmxdev,struct dmxdev_filter * filter,u16 pid)862 static int dvb_dmxdev_add_pid(struct dmxdev *dmxdev,
863 struct dmxdev_filter *filter, u16 pid)
864 {
865 struct dmxdev_feed *feed;
866
867 if ((filter->type != DMXDEV_TYPE_PES) ||
868 (filter->state < DMXDEV_STATE_SET))
869 return -EINVAL;
870
871 /* only TS packet filters may have multiple PIDs */
872 if ((filter->params.pes.output != DMX_OUT_TSDEMUX_TAP) &&
873 (!list_empty(&filter->feed.ts)))
874 return -EINVAL;
875
876 feed = kzalloc(sizeof(struct dmxdev_feed), GFP_KERNEL);
877 if (feed == NULL)
878 return -ENOMEM;
879
880 feed->pid = pid;
881 list_add(&feed->next, &filter->feed.ts);
882
883 if (filter->state >= DMXDEV_STATE_GO)
884 return dvb_dmxdev_start_feed(dmxdev, filter, feed);
885
886 return 0;
887 }
888
dvb_dmxdev_remove_pid(struct dmxdev * dmxdev,struct dmxdev_filter * filter,u16 pid)889 static int dvb_dmxdev_remove_pid(struct dmxdev *dmxdev,
890 struct dmxdev_filter *filter, u16 pid)
891 {
892 struct dmxdev_feed *feed, *tmp;
893
894 if ((filter->type != DMXDEV_TYPE_PES) ||
895 (filter->state < DMXDEV_STATE_SET))
896 return -EINVAL;
897
898 list_for_each_entry_safe(feed, tmp, &filter->feed.ts, next) {
899 if ((feed->pid == pid) && (feed->ts != NULL)) {
900 feed->ts->stop_filtering(feed->ts);
901 filter->dev->demux->release_ts_feed(filter->dev->demux,
902 feed->ts);
903 list_del(&feed->next);
904 kfree(feed);
905 }
906 }
907
908 return 0;
909 }
910
dvb_dmxdev_filter_set(struct dmxdev * dmxdev,struct dmxdev_filter * dmxdevfilter,struct dmx_sct_filter_params * params)911 static int dvb_dmxdev_filter_set(struct dmxdev *dmxdev,
912 struct dmxdev_filter *dmxdevfilter,
913 struct dmx_sct_filter_params *params)
914 {
915 dprintk("%s: PID=0x%04x, flags=%02x, timeout=%d\n",
916 __func__, params->pid, params->flags, params->timeout);
917
918 dvb_dmxdev_filter_stop(dmxdevfilter);
919
920 dmxdevfilter->type = DMXDEV_TYPE_SEC;
921 memcpy(&dmxdevfilter->params.sec,
922 params, sizeof(struct dmx_sct_filter_params));
923 invert_mode(&dmxdevfilter->params.sec.filter);
924 dvb_dmxdev_filter_state_set(dmxdevfilter, DMXDEV_STATE_SET);
925
926 if (params->flags & DMX_IMMEDIATE_START)
927 return dvb_dmxdev_filter_start(dmxdevfilter);
928
929 return 0;
930 }
931
dvb_dmxdev_pes_filter_set(struct dmxdev * dmxdev,struct dmxdev_filter * dmxdevfilter,struct dmx_pes_filter_params * params)932 static int dvb_dmxdev_pes_filter_set(struct dmxdev *dmxdev,
933 struct dmxdev_filter *dmxdevfilter,
934 struct dmx_pes_filter_params *params)
935 {
936 int ret;
937
938 dvb_dmxdev_filter_stop(dmxdevfilter);
939 dvb_dmxdev_filter_reset(dmxdevfilter);
940
941 if ((unsigned int)params->pes_type > DMX_PES_OTHER)
942 return -EINVAL;
943
944 dmxdevfilter->type = DMXDEV_TYPE_PES;
945 memcpy(&dmxdevfilter->params, params,
946 sizeof(struct dmx_pes_filter_params));
947 INIT_LIST_HEAD(&dmxdevfilter->feed.ts);
948
949 dvb_dmxdev_filter_state_set(dmxdevfilter, DMXDEV_STATE_SET);
950
951 ret = dvb_dmxdev_add_pid(dmxdev, dmxdevfilter,
952 dmxdevfilter->params.pes.pid);
953 if (ret < 0)
954 return ret;
955
956 if (params->flags & DMX_IMMEDIATE_START)
957 return dvb_dmxdev_filter_start(dmxdevfilter);
958
959 return 0;
960 }
961
dvb_dmxdev_read_sec(struct dmxdev_filter * dfil,struct file * file,char __user * buf,size_t count,loff_t * ppos)962 static ssize_t dvb_dmxdev_read_sec(struct dmxdev_filter *dfil,
963 struct file *file, char __user *buf,
964 size_t count, loff_t *ppos)
965 {
966 int result, hcount;
967 int done = 0;
968
969 if (dfil->todo <= 0) {
970 hcount = 3 + dfil->todo;
971 if (hcount > count)
972 hcount = count;
973 result = dvb_dmxdev_buffer_read(&dfil->buffer,
974 file->f_flags & O_NONBLOCK,
975 buf, hcount, ppos);
976 if (result < 0) {
977 dfil->todo = 0;
978 return result;
979 }
980 if (copy_from_user(dfil->secheader - dfil->todo, buf, result))
981 return -EFAULT;
982 buf += result;
983 done = result;
984 count -= result;
985 dfil->todo -= result;
986 if (dfil->todo > -3)
987 return done;
988 dfil->todo = ((dfil->secheader[1] << 8) | dfil->secheader[2]) & 0xfff;
989 if (!count)
990 return done;
991 }
992 if (count > dfil->todo)
993 count = dfil->todo;
994 result = dvb_dmxdev_buffer_read(&dfil->buffer,
995 file->f_flags & O_NONBLOCK,
996 buf, count, ppos);
997 if (result < 0)
998 return result;
999 dfil->todo -= result;
1000 return (result + done);
1001 }
1002
1003 static ssize_t
dvb_demux_read(struct file * file,char __user * buf,size_t count,loff_t * ppos)1004 dvb_demux_read(struct file *file, char __user *buf, size_t count,
1005 loff_t *ppos)
1006 {
1007 struct dmxdev_filter *dmxdevfilter = file->private_data;
1008 int ret;
1009
1010 if (mutex_lock_interruptible(&dmxdevfilter->mutex))
1011 return -ERESTARTSYS;
1012
1013 if (dmxdevfilter->type == DMXDEV_TYPE_SEC)
1014 ret = dvb_dmxdev_read_sec(dmxdevfilter, file, buf, count, ppos);
1015 else
1016 ret = dvb_dmxdev_buffer_read(&dmxdevfilter->buffer,
1017 file->f_flags & O_NONBLOCK,
1018 buf, count, ppos);
1019
1020 mutex_unlock(&dmxdevfilter->mutex);
1021 return ret;
1022 }
1023
dvb_demux_do_ioctl(struct file * file,unsigned int cmd,void * parg)1024 static int dvb_demux_do_ioctl(struct file *file,
1025 unsigned int cmd, void *parg)
1026 {
1027 struct dmxdev_filter *dmxdevfilter = file->private_data;
1028 struct dmxdev *dmxdev = dmxdevfilter->dev;
1029 unsigned long arg = (unsigned long)parg;
1030 int ret = 0;
1031
1032 if (mutex_lock_interruptible(&dmxdev->mutex))
1033 return -ERESTARTSYS;
1034
1035 switch (cmd) {
1036 case DMX_START:
1037 if (mutex_lock_interruptible(&dmxdevfilter->mutex)) {
1038 mutex_unlock(&dmxdev->mutex);
1039 return -ERESTARTSYS;
1040 }
1041 if (dmxdevfilter->state < DMXDEV_STATE_SET)
1042 ret = -EINVAL;
1043 else
1044 ret = dvb_dmxdev_filter_start(dmxdevfilter);
1045 mutex_unlock(&dmxdevfilter->mutex);
1046 break;
1047
1048 case DMX_STOP:
1049 if (mutex_lock_interruptible(&dmxdevfilter->mutex)) {
1050 mutex_unlock(&dmxdev->mutex);
1051 return -ERESTARTSYS;
1052 }
1053 ret = dvb_dmxdev_filter_stop(dmxdevfilter);
1054 mutex_unlock(&dmxdevfilter->mutex);
1055 break;
1056
1057 case DMX_SET_FILTER:
1058 if (mutex_lock_interruptible(&dmxdevfilter->mutex)) {
1059 mutex_unlock(&dmxdev->mutex);
1060 return -ERESTARTSYS;
1061 }
1062 ret = dvb_dmxdev_filter_set(dmxdev, dmxdevfilter, parg);
1063 mutex_unlock(&dmxdevfilter->mutex);
1064 break;
1065
1066 case DMX_SET_PES_FILTER:
1067 if (mutex_lock_interruptible(&dmxdevfilter->mutex)) {
1068 mutex_unlock(&dmxdev->mutex);
1069 return -ERESTARTSYS;
1070 }
1071 ret = dvb_dmxdev_pes_filter_set(dmxdev, dmxdevfilter, parg);
1072 mutex_unlock(&dmxdevfilter->mutex);
1073 break;
1074
1075 case DMX_SET_BUFFER_SIZE:
1076 if (mutex_lock_interruptible(&dmxdevfilter->mutex)) {
1077 mutex_unlock(&dmxdev->mutex);
1078 return -ERESTARTSYS;
1079 }
1080 ret = dvb_dmxdev_set_buffer_size(dmxdevfilter, arg);
1081 mutex_unlock(&dmxdevfilter->mutex);
1082 break;
1083
1084 case DMX_GET_PES_PIDS:
1085 if (!dmxdev->demux->get_pes_pids) {
1086 ret = -EINVAL;
1087 break;
1088 }
1089 dmxdev->demux->get_pes_pids(dmxdev->demux, parg);
1090 break;
1091
1092 case DMX_GET_STC:
1093 if (!dmxdev->demux->get_stc) {
1094 ret = -EINVAL;
1095 break;
1096 }
1097 ret = dmxdev->demux->get_stc(dmxdev->demux,
1098 ((struct dmx_stc *)parg)->num,
1099 &((struct dmx_stc *)parg)->stc,
1100 &((struct dmx_stc *)parg)->base);
1101 break;
1102
1103 case DMX_ADD_PID:
1104 if (mutex_lock_interruptible(&dmxdevfilter->mutex)) {
1105 ret = -ERESTARTSYS;
1106 break;
1107 }
1108 ret = dvb_dmxdev_add_pid(dmxdev, dmxdevfilter, *(u16 *)parg);
1109 mutex_unlock(&dmxdevfilter->mutex);
1110 break;
1111
1112 case DMX_REMOVE_PID:
1113 if (mutex_lock_interruptible(&dmxdevfilter->mutex)) {
1114 ret = -ERESTARTSYS;
1115 break;
1116 }
1117 ret = dvb_dmxdev_remove_pid(dmxdev, dmxdevfilter, *(u16 *)parg);
1118 mutex_unlock(&dmxdevfilter->mutex);
1119 break;
1120
1121 #ifdef CONFIG_DVB_MMAP
1122 case DMX_REQBUFS:
1123 if (mutex_lock_interruptible(&dmxdevfilter->mutex)) {
1124 mutex_unlock(&dmxdev->mutex);
1125 return -ERESTARTSYS;
1126 }
1127 ret = dvb_vb2_reqbufs(&dmxdevfilter->vb2_ctx, parg);
1128 mutex_unlock(&dmxdevfilter->mutex);
1129 break;
1130
1131 case DMX_QUERYBUF:
1132 if (mutex_lock_interruptible(&dmxdevfilter->mutex)) {
1133 mutex_unlock(&dmxdev->mutex);
1134 return -ERESTARTSYS;
1135 }
1136 ret = dvb_vb2_querybuf(&dmxdevfilter->vb2_ctx, parg);
1137 mutex_unlock(&dmxdevfilter->mutex);
1138 break;
1139
1140 case DMX_EXPBUF:
1141 if (mutex_lock_interruptible(&dmxdevfilter->mutex)) {
1142 mutex_unlock(&dmxdev->mutex);
1143 return -ERESTARTSYS;
1144 }
1145 ret = dvb_vb2_expbuf(&dmxdevfilter->vb2_ctx, parg);
1146 mutex_unlock(&dmxdevfilter->mutex);
1147 break;
1148
1149 case DMX_QBUF:
1150 if (mutex_lock_interruptible(&dmxdevfilter->mutex)) {
1151 mutex_unlock(&dmxdev->mutex);
1152 return -ERESTARTSYS;
1153 }
1154 ret = dvb_vb2_qbuf(&dmxdevfilter->vb2_ctx, parg);
1155 if (ret == 0 && !dvb_vb2_is_streaming(&dmxdevfilter->vb2_ctx))
1156 ret = dvb_vb2_stream_on(&dmxdevfilter->vb2_ctx);
1157 mutex_unlock(&dmxdevfilter->mutex);
1158 break;
1159
1160 case DMX_DQBUF:
1161 if (mutex_lock_interruptible(&dmxdevfilter->mutex)) {
1162 mutex_unlock(&dmxdev->mutex);
1163 return -ERESTARTSYS;
1164 }
1165 ret = dvb_vb2_dqbuf(&dmxdevfilter->vb2_ctx, parg);
1166 mutex_unlock(&dmxdevfilter->mutex);
1167 break;
1168 #endif
1169 default:
1170 ret = -ENOTTY;
1171 break;
1172 }
1173 mutex_unlock(&dmxdev->mutex);
1174 return ret;
1175 }
1176
dvb_demux_ioctl(struct file * file,unsigned int cmd,unsigned long arg)1177 static long dvb_demux_ioctl(struct file *file, unsigned int cmd,
1178 unsigned long arg)
1179 {
1180 return dvb_usercopy(file, cmd, arg, dvb_demux_do_ioctl);
1181 }
1182
dvb_demux_poll(struct file * file,poll_table * wait)1183 static __poll_t dvb_demux_poll(struct file *file, poll_table *wait)
1184 {
1185 struct dmxdev_filter *dmxdevfilter = file->private_data;
1186 __poll_t mask = 0;
1187
1188 poll_wait(file, &dmxdevfilter->buffer.queue, wait);
1189
1190 if ((!dmxdevfilter) || dmxdevfilter->dev->exit)
1191 return EPOLLERR;
1192 if (dvb_vb2_is_streaming(&dmxdevfilter->vb2_ctx))
1193 return dvb_vb2_poll(&dmxdevfilter->vb2_ctx, file, wait);
1194
1195 if (dmxdevfilter->state != DMXDEV_STATE_GO &&
1196 dmxdevfilter->state != DMXDEV_STATE_DONE &&
1197 dmxdevfilter->state != DMXDEV_STATE_TIMEDOUT)
1198 return 0;
1199
1200 if (dmxdevfilter->buffer.error)
1201 mask |= (EPOLLIN | EPOLLRDNORM | EPOLLPRI | EPOLLERR);
1202
1203 if (!dvb_ringbuffer_empty(&dmxdevfilter->buffer))
1204 mask |= (EPOLLIN | EPOLLRDNORM | EPOLLPRI);
1205
1206 return mask;
1207 }
1208
1209 #ifdef CONFIG_DVB_MMAP
dvb_demux_mmap(struct file * file,struct vm_area_struct * vma)1210 static int dvb_demux_mmap(struct file *file, struct vm_area_struct *vma)
1211 {
1212 struct dmxdev_filter *dmxdevfilter = file->private_data;
1213 struct dmxdev *dmxdev = dmxdevfilter->dev;
1214 int ret;
1215
1216 if (!dmxdev->may_do_mmap)
1217 return -ENOTTY;
1218
1219 if (mutex_lock_interruptible(&dmxdev->mutex))
1220 return -ERESTARTSYS;
1221
1222 if (mutex_lock_interruptible(&dmxdevfilter->mutex)) {
1223 mutex_unlock(&dmxdev->mutex);
1224 return -ERESTARTSYS;
1225 }
1226 ret = dvb_vb2_mmap(&dmxdevfilter->vb2_ctx, vma);
1227
1228 mutex_unlock(&dmxdevfilter->mutex);
1229 mutex_unlock(&dmxdev->mutex);
1230
1231 return ret;
1232 }
1233 #endif
1234
dvb_demux_release(struct inode * inode,struct file * file)1235 static int dvb_demux_release(struct inode *inode, struct file *file)
1236 {
1237 struct dmxdev_filter *dmxdevfilter = file->private_data;
1238 struct dmxdev *dmxdev = dmxdevfilter->dev;
1239 int ret;
1240
1241 ret = dvb_dmxdev_filter_free(dmxdev, dmxdevfilter);
1242
1243 mutex_lock(&dmxdev->mutex);
1244 dmxdev->dvbdev->users--;
1245 if (dmxdev->dvbdev->users == 1 && dmxdev->exit == 1) {
1246 mutex_unlock(&dmxdev->mutex);
1247 wake_up(&dmxdev->dvbdev->wait_queue);
1248 } else
1249 mutex_unlock(&dmxdev->mutex);
1250
1251 return ret;
1252 }
1253
1254 static const struct file_operations dvb_demux_fops = {
1255 .owner = THIS_MODULE,
1256 .read = dvb_demux_read,
1257 .unlocked_ioctl = dvb_demux_ioctl,
1258 .compat_ioctl = dvb_demux_ioctl,
1259 .open = dvb_demux_open,
1260 .release = dvb_demux_release,
1261 .poll = dvb_demux_poll,
1262 .llseek = default_llseek,
1263 #ifdef CONFIG_DVB_MMAP
1264 .mmap = dvb_demux_mmap,
1265 #endif
1266 };
1267
1268 static const struct dvb_device dvbdev_demux = {
1269 .priv = NULL,
1270 .users = 1,
1271 .writers = 1,
1272 #if defined(CONFIG_MEDIA_CONTROLLER_DVB)
1273 .name = "dvb-demux",
1274 #endif
1275 .fops = &dvb_demux_fops
1276 };
1277
dvb_dvr_do_ioctl(struct file * file,unsigned int cmd,void * parg)1278 static int dvb_dvr_do_ioctl(struct file *file,
1279 unsigned int cmd, void *parg)
1280 {
1281 struct dvb_device *dvbdev = file->private_data;
1282 struct dmxdev *dmxdev = dvbdev->priv;
1283 unsigned long arg = (unsigned long)parg;
1284 int ret;
1285
1286 if (mutex_lock_interruptible(&dmxdev->mutex))
1287 return -ERESTARTSYS;
1288
1289 switch (cmd) {
1290 case DMX_SET_BUFFER_SIZE:
1291 ret = dvb_dvr_set_buffer_size(dmxdev, arg);
1292 break;
1293
1294 #ifdef CONFIG_DVB_MMAP
1295 case DMX_REQBUFS:
1296 ret = dvb_vb2_reqbufs(&dmxdev->dvr_vb2_ctx, parg);
1297 break;
1298
1299 case DMX_QUERYBUF:
1300 ret = dvb_vb2_querybuf(&dmxdev->dvr_vb2_ctx, parg);
1301 break;
1302
1303 case DMX_EXPBUF:
1304 ret = dvb_vb2_expbuf(&dmxdev->dvr_vb2_ctx, parg);
1305 break;
1306
1307 case DMX_QBUF:
1308 ret = dvb_vb2_qbuf(&dmxdev->dvr_vb2_ctx, parg);
1309 if (ret == 0 && !dvb_vb2_is_streaming(&dmxdev->dvr_vb2_ctx))
1310 ret = dvb_vb2_stream_on(&dmxdev->dvr_vb2_ctx);
1311 break;
1312
1313 case DMX_DQBUF:
1314 ret = dvb_vb2_dqbuf(&dmxdev->dvr_vb2_ctx, parg);
1315 break;
1316 #endif
1317 default:
1318 ret = -ENOTTY;
1319 break;
1320 }
1321 mutex_unlock(&dmxdev->mutex);
1322 return ret;
1323 }
1324
dvb_dvr_ioctl(struct file * file,unsigned int cmd,unsigned long arg)1325 static long dvb_dvr_ioctl(struct file *file,
1326 unsigned int cmd, unsigned long arg)
1327 {
1328 return dvb_usercopy(file, cmd, arg, dvb_dvr_do_ioctl);
1329 }
1330
dvb_dvr_poll(struct file * file,poll_table * wait)1331 static __poll_t dvb_dvr_poll(struct file *file, poll_table *wait)
1332 {
1333 struct dvb_device *dvbdev = file->private_data;
1334 struct dmxdev *dmxdev = dvbdev->priv;
1335 __poll_t mask = 0;
1336
1337 dprintk("%s\n", __func__);
1338
1339 poll_wait(file, &dmxdev->dvr_buffer.queue, wait);
1340
1341 if (dmxdev->exit)
1342 return EPOLLERR;
1343 if (dvb_vb2_is_streaming(&dmxdev->dvr_vb2_ctx))
1344 return dvb_vb2_poll(&dmxdev->dvr_vb2_ctx, file, wait);
1345
1346 if (((file->f_flags & O_ACCMODE) == O_RDONLY) ||
1347 dmxdev->may_do_mmap) {
1348 if (dmxdev->dvr_buffer.error)
1349 mask |= (EPOLLIN | EPOLLRDNORM | EPOLLPRI | EPOLLERR);
1350
1351 if (!dvb_ringbuffer_empty(&dmxdev->dvr_buffer))
1352 mask |= (EPOLLIN | EPOLLRDNORM | EPOLLPRI);
1353 } else
1354 mask |= (EPOLLOUT | EPOLLWRNORM | EPOLLPRI);
1355
1356 return mask;
1357 }
1358
1359 #ifdef CONFIG_DVB_MMAP
dvb_dvr_mmap(struct file * file,struct vm_area_struct * vma)1360 static int dvb_dvr_mmap(struct file *file, struct vm_area_struct *vma)
1361 {
1362 struct dvb_device *dvbdev = file->private_data;
1363 struct dmxdev *dmxdev = dvbdev->priv;
1364 int ret;
1365
1366 if (!dmxdev->may_do_mmap)
1367 return -ENOTTY;
1368
1369 if (dmxdev->exit)
1370 return -ENODEV;
1371
1372 if (mutex_lock_interruptible(&dmxdev->mutex))
1373 return -ERESTARTSYS;
1374
1375 ret = dvb_vb2_mmap(&dmxdev->dvr_vb2_ctx, vma);
1376 mutex_unlock(&dmxdev->mutex);
1377 return ret;
1378 }
1379 #endif
1380
1381 static const struct file_operations dvb_dvr_fops = {
1382 .owner = THIS_MODULE,
1383 .read = dvb_dvr_read,
1384 .write = dvb_dvr_write,
1385 .unlocked_ioctl = dvb_dvr_ioctl,
1386 .open = dvb_dvr_open,
1387 .release = dvb_dvr_release,
1388 .poll = dvb_dvr_poll,
1389 .llseek = default_llseek,
1390 #ifdef CONFIG_DVB_MMAP
1391 .mmap = dvb_dvr_mmap,
1392 #endif
1393 };
1394
1395 static const struct dvb_device dvbdev_dvr = {
1396 .priv = NULL,
1397 .readers = 1,
1398 .users = 1,
1399 #if defined(CONFIG_MEDIA_CONTROLLER_DVB)
1400 .name = "dvb-dvr",
1401 #endif
1402 .fops = &dvb_dvr_fops
1403 };
dvb_dmxdev_init(struct dmxdev * dmxdev,struct dvb_adapter * dvb_adapter)1404 int dvb_dmxdev_init(struct dmxdev *dmxdev, struct dvb_adapter *dvb_adapter)
1405 {
1406 int i, ret;
1407
1408 if (dmxdev->demux->open(dmxdev->demux) < 0)
1409 return -EUSERS;
1410
1411 dmxdev->filter = vmalloc(array_size(sizeof(struct dmxdev_filter),
1412 dmxdev->filternum));
1413 if (!dmxdev->filter)
1414 return -ENOMEM;
1415
1416 mutex_init(&dmxdev->mutex);
1417 spin_lock_init(&dmxdev->lock);
1418 for (i = 0; i < dmxdev->filternum; i++) {
1419 dmxdev->filter[i].dev = dmxdev;
1420 dmxdev->filter[i].buffer.data = NULL;
1421 dvb_dmxdev_filter_state_set(&dmxdev->filter[i],
1422 DMXDEV_STATE_FREE);
1423 }
1424
1425 ret = dvb_register_device(dvb_adapter, &dmxdev->dvbdev, &dvbdev_demux, dmxdev,
1426 DVB_DEVICE_DEMUX, dmxdev->filternum);
1427 if (ret < 0)
1428 goto err_register_dvbdev;
1429
1430 ret = dvb_register_device(dvb_adapter, &dmxdev->dvr_dvbdev, &dvbdev_dvr,
1431 dmxdev, DVB_DEVICE_DVR, dmxdev->filternum);
1432 if (ret < 0)
1433 goto err_register_dvr_dvbdev;
1434
1435 dvb_ringbuffer_init(&dmxdev->dvr_buffer, NULL, 8192);
1436
1437 return 0;
1438
1439 err_register_dvr_dvbdev:
1440 dvb_unregister_device(dmxdev->dvbdev);
1441 err_register_dvbdev:
1442 vfree(dmxdev->filter);
1443 dmxdev->filter = NULL;
1444 return ret;
1445 }
1446
1447 EXPORT_SYMBOL(dvb_dmxdev_init);
1448
dvb_dmxdev_release(struct dmxdev * dmxdev)1449 void dvb_dmxdev_release(struct dmxdev *dmxdev)
1450 {
1451 dmxdev->exit = 1;
1452 if (dmxdev->dvbdev->users > 1) {
1453 wait_event(dmxdev->dvbdev->wait_queue,
1454 dmxdev->dvbdev->users == 1);
1455 }
1456 if (dmxdev->dvr_dvbdev->users > 1) {
1457 wait_event(dmxdev->dvr_dvbdev->wait_queue,
1458 dmxdev->dvr_dvbdev->users == 1);
1459 }
1460
1461 dvb_unregister_device(dmxdev->dvbdev);
1462 dvb_unregister_device(dmxdev->dvr_dvbdev);
1463
1464 vfree(dmxdev->filter);
1465 dmxdev->filter = NULL;
1466 dmxdev->demux->close(dmxdev->demux);
1467 }
1468
1469 EXPORT_SYMBOL(dvb_dmxdev_release);
1470