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 if (dmxdev->exit) {
794 mutex_unlock(&dmxdev->mutex);
795 return -ENODEV;
796 }
797
798 for (i = 0; i < dmxdev->filternum; i++)
799 if (dmxdev->filter[i].state == DMXDEV_STATE_FREE)
800 break;
801
802 if (i == dmxdev->filternum) {
803 mutex_unlock(&dmxdev->mutex);
804 return -EMFILE;
805 }
806
807 dmxdevfilter = &dmxdev->filter[i];
808 mutex_init(&dmxdevfilter->mutex);
809 file->private_data = dmxdevfilter;
810
811 #ifdef CONFIG_DVB_MMAP
812 dmxdev->may_do_mmap = 1;
813 #else
814 dmxdev->may_do_mmap = 0;
815 #endif
816
817 dvb_ringbuffer_init(&dmxdevfilter->buffer, NULL, 8192);
818 dvb_vb2_init(&dmxdevfilter->vb2_ctx, "demux_filter",
819 file->f_flags & O_NONBLOCK);
820 dmxdevfilter->type = DMXDEV_TYPE_NONE;
821 dvb_dmxdev_filter_state_set(dmxdevfilter, DMXDEV_STATE_ALLOCATED);
822 timer_setup(&dmxdevfilter->timer, dvb_dmxdev_filter_timeout, 0);
823
824 dvbdev->users++;
825
826 mutex_unlock(&dmxdev->mutex);
827 return 0;
828 }
829
dvb_dmxdev_filter_free(struct dmxdev * dmxdev,struct dmxdev_filter * dmxdevfilter)830 static int dvb_dmxdev_filter_free(struct dmxdev *dmxdev,
831 struct dmxdev_filter *dmxdevfilter)
832 {
833 mutex_lock(&dmxdev->mutex);
834 mutex_lock(&dmxdevfilter->mutex);
835 if (dvb_vb2_is_streaming(&dmxdevfilter->vb2_ctx))
836 dvb_vb2_stream_off(&dmxdevfilter->vb2_ctx);
837 dvb_vb2_release(&dmxdevfilter->vb2_ctx);
838
839
840 dvb_dmxdev_filter_stop(dmxdevfilter);
841 dvb_dmxdev_filter_reset(dmxdevfilter);
842
843 if (dmxdevfilter->buffer.data) {
844 void *mem = dmxdevfilter->buffer.data;
845
846 spin_lock_irq(&dmxdev->lock);
847 dmxdevfilter->buffer.data = NULL;
848 spin_unlock_irq(&dmxdev->lock);
849 vfree(mem);
850 }
851
852 dvb_dmxdev_filter_state_set(dmxdevfilter, DMXDEV_STATE_FREE);
853 wake_up(&dmxdevfilter->buffer.queue);
854 mutex_unlock(&dmxdevfilter->mutex);
855 mutex_unlock(&dmxdev->mutex);
856 return 0;
857 }
858
invert_mode(struct dmx_filter * filter)859 static inline void invert_mode(struct dmx_filter *filter)
860 {
861 int i;
862
863 for (i = 0; i < DMX_FILTER_SIZE; i++)
864 filter->mode[i] ^= 0xff;
865 }
866
dvb_dmxdev_add_pid(struct dmxdev * dmxdev,struct dmxdev_filter * filter,u16 pid)867 static int dvb_dmxdev_add_pid(struct dmxdev *dmxdev,
868 struct dmxdev_filter *filter, u16 pid)
869 {
870 struct dmxdev_feed *feed;
871
872 if ((filter->type != DMXDEV_TYPE_PES) ||
873 (filter->state < DMXDEV_STATE_SET))
874 return -EINVAL;
875
876 /* only TS packet filters may have multiple PIDs */
877 if ((filter->params.pes.output != DMX_OUT_TSDEMUX_TAP) &&
878 (!list_empty(&filter->feed.ts)))
879 return -EINVAL;
880
881 feed = kzalloc(sizeof(struct dmxdev_feed), GFP_KERNEL);
882 if (feed == NULL)
883 return -ENOMEM;
884
885 feed->pid = pid;
886 list_add(&feed->next, &filter->feed.ts);
887
888 if (filter->state >= DMXDEV_STATE_GO)
889 return dvb_dmxdev_start_feed(dmxdev, filter, feed);
890
891 return 0;
892 }
893
dvb_dmxdev_remove_pid(struct dmxdev * dmxdev,struct dmxdev_filter * filter,u16 pid)894 static int dvb_dmxdev_remove_pid(struct dmxdev *dmxdev,
895 struct dmxdev_filter *filter, u16 pid)
896 {
897 struct dmxdev_feed *feed, *tmp;
898
899 if ((filter->type != DMXDEV_TYPE_PES) ||
900 (filter->state < DMXDEV_STATE_SET))
901 return -EINVAL;
902
903 list_for_each_entry_safe(feed, tmp, &filter->feed.ts, next) {
904 if ((feed->pid == pid) && (feed->ts != NULL)) {
905 feed->ts->stop_filtering(feed->ts);
906 filter->dev->demux->release_ts_feed(filter->dev->demux,
907 feed->ts);
908 list_del(&feed->next);
909 kfree(feed);
910 }
911 }
912
913 return 0;
914 }
915
dvb_dmxdev_filter_set(struct dmxdev * dmxdev,struct dmxdev_filter * dmxdevfilter,struct dmx_sct_filter_params * params)916 static int dvb_dmxdev_filter_set(struct dmxdev *dmxdev,
917 struct dmxdev_filter *dmxdevfilter,
918 struct dmx_sct_filter_params *params)
919 {
920 dprintk("%s: PID=0x%04x, flags=%02x, timeout=%d\n",
921 __func__, params->pid, params->flags, params->timeout);
922
923 dvb_dmxdev_filter_stop(dmxdevfilter);
924
925 dmxdevfilter->type = DMXDEV_TYPE_SEC;
926 memcpy(&dmxdevfilter->params.sec,
927 params, sizeof(struct dmx_sct_filter_params));
928 invert_mode(&dmxdevfilter->params.sec.filter);
929 dvb_dmxdev_filter_state_set(dmxdevfilter, DMXDEV_STATE_SET);
930
931 if (params->flags & DMX_IMMEDIATE_START)
932 return dvb_dmxdev_filter_start(dmxdevfilter);
933
934 return 0;
935 }
936
dvb_dmxdev_pes_filter_set(struct dmxdev * dmxdev,struct dmxdev_filter * dmxdevfilter,struct dmx_pes_filter_params * params)937 static int dvb_dmxdev_pes_filter_set(struct dmxdev *dmxdev,
938 struct dmxdev_filter *dmxdevfilter,
939 struct dmx_pes_filter_params *params)
940 {
941 int ret;
942
943 dvb_dmxdev_filter_stop(dmxdevfilter);
944 dvb_dmxdev_filter_reset(dmxdevfilter);
945
946 if ((unsigned int)params->pes_type > DMX_PES_OTHER)
947 return -EINVAL;
948
949 dmxdevfilter->type = DMXDEV_TYPE_PES;
950 memcpy(&dmxdevfilter->params, params,
951 sizeof(struct dmx_pes_filter_params));
952 INIT_LIST_HEAD(&dmxdevfilter->feed.ts);
953
954 dvb_dmxdev_filter_state_set(dmxdevfilter, DMXDEV_STATE_SET);
955
956 ret = dvb_dmxdev_add_pid(dmxdev, dmxdevfilter,
957 dmxdevfilter->params.pes.pid);
958 if (ret < 0)
959 return ret;
960
961 if (params->flags & DMX_IMMEDIATE_START)
962 return dvb_dmxdev_filter_start(dmxdevfilter);
963
964 return 0;
965 }
966
dvb_dmxdev_read_sec(struct dmxdev_filter * dfil,struct file * file,char __user * buf,size_t count,loff_t * ppos)967 static ssize_t dvb_dmxdev_read_sec(struct dmxdev_filter *dfil,
968 struct file *file, char __user *buf,
969 size_t count, loff_t *ppos)
970 {
971 int result, hcount;
972 int done = 0;
973
974 if (dfil->todo <= 0) {
975 hcount = 3 + dfil->todo;
976 if (hcount > count)
977 hcount = count;
978 result = dvb_dmxdev_buffer_read(&dfil->buffer,
979 file->f_flags & O_NONBLOCK,
980 buf, hcount, ppos);
981 if (result < 0) {
982 dfil->todo = 0;
983 return result;
984 }
985 if (copy_from_user(dfil->secheader - dfil->todo, buf, result))
986 return -EFAULT;
987 buf += result;
988 done = result;
989 count -= result;
990 dfil->todo -= result;
991 if (dfil->todo > -3)
992 return done;
993 dfil->todo = ((dfil->secheader[1] << 8) | dfil->secheader[2]) & 0xfff;
994 if (!count)
995 return done;
996 }
997 if (count > dfil->todo)
998 count = dfil->todo;
999 result = dvb_dmxdev_buffer_read(&dfil->buffer,
1000 file->f_flags & O_NONBLOCK,
1001 buf, count, ppos);
1002 if (result < 0)
1003 return result;
1004 dfil->todo -= result;
1005 return (result + done);
1006 }
1007
1008 static ssize_t
dvb_demux_read(struct file * file,char __user * buf,size_t count,loff_t * ppos)1009 dvb_demux_read(struct file *file, char __user *buf, size_t count,
1010 loff_t *ppos)
1011 {
1012 struct dmxdev_filter *dmxdevfilter = file->private_data;
1013 int ret;
1014
1015 if (mutex_lock_interruptible(&dmxdevfilter->mutex))
1016 return -ERESTARTSYS;
1017
1018 if (dmxdevfilter->type == DMXDEV_TYPE_SEC)
1019 ret = dvb_dmxdev_read_sec(dmxdevfilter, file, buf, count, ppos);
1020 else
1021 ret = dvb_dmxdev_buffer_read(&dmxdevfilter->buffer,
1022 file->f_flags & O_NONBLOCK,
1023 buf, count, ppos);
1024
1025 mutex_unlock(&dmxdevfilter->mutex);
1026 return ret;
1027 }
1028
dvb_demux_do_ioctl(struct file * file,unsigned int cmd,void * parg)1029 static int dvb_demux_do_ioctl(struct file *file,
1030 unsigned int cmd, void *parg)
1031 {
1032 struct dmxdev_filter *dmxdevfilter = file->private_data;
1033 struct dmxdev *dmxdev = dmxdevfilter->dev;
1034 unsigned long arg = (unsigned long)parg;
1035 int ret = 0;
1036
1037 if (mutex_lock_interruptible(&dmxdev->mutex))
1038 return -ERESTARTSYS;
1039
1040 switch (cmd) {
1041 case DMX_START:
1042 if (mutex_lock_interruptible(&dmxdevfilter->mutex)) {
1043 mutex_unlock(&dmxdev->mutex);
1044 return -ERESTARTSYS;
1045 }
1046 if (dmxdevfilter->state < DMXDEV_STATE_SET)
1047 ret = -EINVAL;
1048 else
1049 ret = dvb_dmxdev_filter_start(dmxdevfilter);
1050 mutex_unlock(&dmxdevfilter->mutex);
1051 break;
1052
1053 case DMX_STOP:
1054 if (mutex_lock_interruptible(&dmxdevfilter->mutex)) {
1055 mutex_unlock(&dmxdev->mutex);
1056 return -ERESTARTSYS;
1057 }
1058 ret = dvb_dmxdev_filter_stop(dmxdevfilter);
1059 mutex_unlock(&dmxdevfilter->mutex);
1060 break;
1061
1062 case DMX_SET_FILTER:
1063 if (mutex_lock_interruptible(&dmxdevfilter->mutex)) {
1064 mutex_unlock(&dmxdev->mutex);
1065 return -ERESTARTSYS;
1066 }
1067 ret = dvb_dmxdev_filter_set(dmxdev, dmxdevfilter, parg);
1068 mutex_unlock(&dmxdevfilter->mutex);
1069 break;
1070
1071 case DMX_SET_PES_FILTER:
1072 if (mutex_lock_interruptible(&dmxdevfilter->mutex)) {
1073 mutex_unlock(&dmxdev->mutex);
1074 return -ERESTARTSYS;
1075 }
1076 ret = dvb_dmxdev_pes_filter_set(dmxdev, dmxdevfilter, parg);
1077 mutex_unlock(&dmxdevfilter->mutex);
1078 break;
1079
1080 case DMX_SET_BUFFER_SIZE:
1081 if (mutex_lock_interruptible(&dmxdevfilter->mutex)) {
1082 mutex_unlock(&dmxdev->mutex);
1083 return -ERESTARTSYS;
1084 }
1085 ret = dvb_dmxdev_set_buffer_size(dmxdevfilter, arg);
1086 mutex_unlock(&dmxdevfilter->mutex);
1087 break;
1088
1089 case DMX_GET_PES_PIDS:
1090 if (!dmxdev->demux->get_pes_pids) {
1091 ret = -EINVAL;
1092 break;
1093 }
1094 dmxdev->demux->get_pes_pids(dmxdev->demux, parg);
1095 break;
1096
1097 case DMX_GET_STC:
1098 if (!dmxdev->demux->get_stc) {
1099 ret = -EINVAL;
1100 break;
1101 }
1102 ret = dmxdev->demux->get_stc(dmxdev->demux,
1103 ((struct dmx_stc *)parg)->num,
1104 &((struct dmx_stc *)parg)->stc,
1105 &((struct dmx_stc *)parg)->base);
1106 break;
1107
1108 case DMX_ADD_PID:
1109 if (mutex_lock_interruptible(&dmxdevfilter->mutex)) {
1110 ret = -ERESTARTSYS;
1111 break;
1112 }
1113 ret = dvb_dmxdev_add_pid(dmxdev, dmxdevfilter, *(u16 *)parg);
1114 mutex_unlock(&dmxdevfilter->mutex);
1115 break;
1116
1117 case DMX_REMOVE_PID:
1118 if (mutex_lock_interruptible(&dmxdevfilter->mutex)) {
1119 ret = -ERESTARTSYS;
1120 break;
1121 }
1122 ret = dvb_dmxdev_remove_pid(dmxdev, dmxdevfilter, *(u16 *)parg);
1123 mutex_unlock(&dmxdevfilter->mutex);
1124 break;
1125
1126 #ifdef CONFIG_DVB_MMAP
1127 case DMX_REQBUFS:
1128 if (mutex_lock_interruptible(&dmxdevfilter->mutex)) {
1129 mutex_unlock(&dmxdev->mutex);
1130 return -ERESTARTSYS;
1131 }
1132 ret = dvb_vb2_reqbufs(&dmxdevfilter->vb2_ctx, parg);
1133 mutex_unlock(&dmxdevfilter->mutex);
1134 break;
1135
1136 case DMX_QUERYBUF:
1137 if (mutex_lock_interruptible(&dmxdevfilter->mutex)) {
1138 mutex_unlock(&dmxdev->mutex);
1139 return -ERESTARTSYS;
1140 }
1141 ret = dvb_vb2_querybuf(&dmxdevfilter->vb2_ctx, parg);
1142 mutex_unlock(&dmxdevfilter->mutex);
1143 break;
1144
1145 case DMX_EXPBUF:
1146 if (mutex_lock_interruptible(&dmxdevfilter->mutex)) {
1147 mutex_unlock(&dmxdev->mutex);
1148 return -ERESTARTSYS;
1149 }
1150 ret = dvb_vb2_expbuf(&dmxdevfilter->vb2_ctx, parg);
1151 mutex_unlock(&dmxdevfilter->mutex);
1152 break;
1153
1154 case DMX_QBUF:
1155 if (mutex_lock_interruptible(&dmxdevfilter->mutex)) {
1156 mutex_unlock(&dmxdev->mutex);
1157 return -ERESTARTSYS;
1158 }
1159 ret = dvb_vb2_qbuf(&dmxdevfilter->vb2_ctx, parg);
1160 if (ret == 0 && !dvb_vb2_is_streaming(&dmxdevfilter->vb2_ctx))
1161 ret = dvb_vb2_stream_on(&dmxdevfilter->vb2_ctx);
1162 mutex_unlock(&dmxdevfilter->mutex);
1163 break;
1164
1165 case DMX_DQBUF:
1166 if (mutex_lock_interruptible(&dmxdevfilter->mutex)) {
1167 mutex_unlock(&dmxdev->mutex);
1168 return -ERESTARTSYS;
1169 }
1170 ret = dvb_vb2_dqbuf(&dmxdevfilter->vb2_ctx, parg);
1171 mutex_unlock(&dmxdevfilter->mutex);
1172 break;
1173 #endif
1174 default:
1175 ret = -ENOTTY;
1176 break;
1177 }
1178 mutex_unlock(&dmxdev->mutex);
1179 return ret;
1180 }
1181
dvb_demux_ioctl(struct file * file,unsigned int cmd,unsigned long arg)1182 static long dvb_demux_ioctl(struct file *file, unsigned int cmd,
1183 unsigned long arg)
1184 {
1185 return dvb_usercopy(file, cmd, arg, dvb_demux_do_ioctl);
1186 }
1187
dvb_demux_poll(struct file * file,poll_table * wait)1188 static __poll_t dvb_demux_poll(struct file *file, poll_table *wait)
1189 {
1190 struct dmxdev_filter *dmxdevfilter = file->private_data;
1191 __poll_t mask = 0;
1192
1193 poll_wait(file, &dmxdevfilter->buffer.queue, wait);
1194
1195 if ((!dmxdevfilter) || dmxdevfilter->dev->exit)
1196 return EPOLLERR;
1197 if (dvb_vb2_is_streaming(&dmxdevfilter->vb2_ctx))
1198 return dvb_vb2_poll(&dmxdevfilter->vb2_ctx, file, wait);
1199
1200 if (dmxdevfilter->state != DMXDEV_STATE_GO &&
1201 dmxdevfilter->state != DMXDEV_STATE_DONE &&
1202 dmxdevfilter->state != DMXDEV_STATE_TIMEDOUT)
1203 return 0;
1204
1205 if (dmxdevfilter->buffer.error)
1206 mask |= (EPOLLIN | EPOLLRDNORM | EPOLLPRI | EPOLLERR);
1207
1208 if (!dvb_ringbuffer_empty(&dmxdevfilter->buffer))
1209 mask |= (EPOLLIN | EPOLLRDNORM | EPOLLPRI);
1210
1211 return mask;
1212 }
1213
1214 #ifdef CONFIG_DVB_MMAP
dvb_demux_mmap(struct file * file,struct vm_area_struct * vma)1215 static int dvb_demux_mmap(struct file *file, struct vm_area_struct *vma)
1216 {
1217 struct dmxdev_filter *dmxdevfilter = file->private_data;
1218 struct dmxdev *dmxdev = dmxdevfilter->dev;
1219 int ret;
1220
1221 if (!dmxdev->may_do_mmap)
1222 return -ENOTTY;
1223
1224 if (mutex_lock_interruptible(&dmxdev->mutex))
1225 return -ERESTARTSYS;
1226
1227 if (mutex_lock_interruptible(&dmxdevfilter->mutex)) {
1228 mutex_unlock(&dmxdev->mutex);
1229 return -ERESTARTSYS;
1230 }
1231 ret = dvb_vb2_mmap(&dmxdevfilter->vb2_ctx, vma);
1232
1233 mutex_unlock(&dmxdevfilter->mutex);
1234 mutex_unlock(&dmxdev->mutex);
1235
1236 return ret;
1237 }
1238 #endif
1239
dvb_demux_release(struct inode * inode,struct file * file)1240 static int dvb_demux_release(struct inode *inode, struct file *file)
1241 {
1242 struct dmxdev_filter *dmxdevfilter = file->private_data;
1243 struct dmxdev *dmxdev = dmxdevfilter->dev;
1244 int ret;
1245
1246 ret = dvb_dmxdev_filter_free(dmxdev, dmxdevfilter);
1247
1248 mutex_lock(&dmxdev->mutex);
1249 dmxdev->dvbdev->users--;
1250 if (dmxdev->dvbdev->users == 1 && dmxdev->exit == 1) {
1251 mutex_unlock(&dmxdev->mutex);
1252 wake_up(&dmxdev->dvbdev->wait_queue);
1253 } else
1254 mutex_unlock(&dmxdev->mutex);
1255
1256 return ret;
1257 }
1258
1259 static const struct file_operations dvb_demux_fops = {
1260 .owner = THIS_MODULE,
1261 .read = dvb_demux_read,
1262 .unlocked_ioctl = dvb_demux_ioctl,
1263 .compat_ioctl = dvb_demux_ioctl,
1264 .open = dvb_demux_open,
1265 .release = dvb_demux_release,
1266 .poll = dvb_demux_poll,
1267 .llseek = default_llseek,
1268 #ifdef CONFIG_DVB_MMAP
1269 .mmap = dvb_demux_mmap,
1270 #endif
1271 };
1272
1273 static const struct dvb_device dvbdev_demux = {
1274 .priv = NULL,
1275 .users = 1,
1276 .writers = 1,
1277 #if defined(CONFIG_MEDIA_CONTROLLER_DVB)
1278 .name = "dvb-demux",
1279 #endif
1280 .fops = &dvb_demux_fops
1281 };
1282
dvb_dvr_do_ioctl(struct file * file,unsigned int cmd,void * parg)1283 static int dvb_dvr_do_ioctl(struct file *file,
1284 unsigned int cmd, void *parg)
1285 {
1286 struct dvb_device *dvbdev = file->private_data;
1287 struct dmxdev *dmxdev = dvbdev->priv;
1288 unsigned long arg = (unsigned long)parg;
1289 int ret;
1290
1291 if (mutex_lock_interruptible(&dmxdev->mutex))
1292 return -ERESTARTSYS;
1293
1294 switch (cmd) {
1295 case DMX_SET_BUFFER_SIZE:
1296 ret = dvb_dvr_set_buffer_size(dmxdev, arg);
1297 break;
1298
1299 #ifdef CONFIG_DVB_MMAP
1300 case DMX_REQBUFS:
1301 ret = dvb_vb2_reqbufs(&dmxdev->dvr_vb2_ctx, parg);
1302 break;
1303
1304 case DMX_QUERYBUF:
1305 ret = dvb_vb2_querybuf(&dmxdev->dvr_vb2_ctx, parg);
1306 break;
1307
1308 case DMX_EXPBUF:
1309 ret = dvb_vb2_expbuf(&dmxdev->dvr_vb2_ctx, parg);
1310 break;
1311
1312 case DMX_QBUF:
1313 ret = dvb_vb2_qbuf(&dmxdev->dvr_vb2_ctx, parg);
1314 if (ret == 0 && !dvb_vb2_is_streaming(&dmxdev->dvr_vb2_ctx))
1315 ret = dvb_vb2_stream_on(&dmxdev->dvr_vb2_ctx);
1316 break;
1317
1318 case DMX_DQBUF:
1319 ret = dvb_vb2_dqbuf(&dmxdev->dvr_vb2_ctx, parg);
1320 break;
1321 #endif
1322 default:
1323 ret = -ENOTTY;
1324 break;
1325 }
1326 mutex_unlock(&dmxdev->mutex);
1327 return ret;
1328 }
1329
dvb_dvr_ioctl(struct file * file,unsigned int cmd,unsigned long arg)1330 static long dvb_dvr_ioctl(struct file *file,
1331 unsigned int cmd, unsigned long arg)
1332 {
1333 return dvb_usercopy(file, cmd, arg, dvb_dvr_do_ioctl);
1334 }
1335
dvb_dvr_poll(struct file * file,poll_table * wait)1336 static __poll_t dvb_dvr_poll(struct file *file, poll_table *wait)
1337 {
1338 struct dvb_device *dvbdev = file->private_data;
1339 struct dmxdev *dmxdev = dvbdev->priv;
1340 __poll_t mask = 0;
1341
1342 dprintk("%s\n", __func__);
1343
1344 poll_wait(file, &dmxdev->dvr_buffer.queue, wait);
1345
1346 if (dmxdev->exit)
1347 return EPOLLERR;
1348 if (dvb_vb2_is_streaming(&dmxdev->dvr_vb2_ctx))
1349 return dvb_vb2_poll(&dmxdev->dvr_vb2_ctx, file, wait);
1350
1351 if (((file->f_flags & O_ACCMODE) == O_RDONLY) ||
1352 dmxdev->may_do_mmap) {
1353 if (dmxdev->dvr_buffer.error)
1354 mask |= (EPOLLIN | EPOLLRDNORM | EPOLLPRI | EPOLLERR);
1355
1356 if (!dvb_ringbuffer_empty(&dmxdev->dvr_buffer))
1357 mask |= (EPOLLIN | EPOLLRDNORM | EPOLLPRI);
1358 } else
1359 mask |= (EPOLLOUT | EPOLLWRNORM | EPOLLPRI);
1360
1361 return mask;
1362 }
1363
1364 #ifdef CONFIG_DVB_MMAP
dvb_dvr_mmap(struct file * file,struct vm_area_struct * vma)1365 static int dvb_dvr_mmap(struct file *file, struct vm_area_struct *vma)
1366 {
1367 struct dvb_device *dvbdev = file->private_data;
1368 struct dmxdev *dmxdev = dvbdev->priv;
1369 int ret;
1370
1371 if (!dmxdev->may_do_mmap)
1372 return -ENOTTY;
1373
1374 if (dmxdev->exit)
1375 return -ENODEV;
1376
1377 if (mutex_lock_interruptible(&dmxdev->mutex))
1378 return -ERESTARTSYS;
1379
1380 ret = dvb_vb2_mmap(&dmxdev->dvr_vb2_ctx, vma);
1381 mutex_unlock(&dmxdev->mutex);
1382 return ret;
1383 }
1384 #endif
1385
1386 static const struct file_operations dvb_dvr_fops = {
1387 .owner = THIS_MODULE,
1388 .read = dvb_dvr_read,
1389 .write = dvb_dvr_write,
1390 .unlocked_ioctl = dvb_dvr_ioctl,
1391 .open = dvb_dvr_open,
1392 .release = dvb_dvr_release,
1393 .poll = dvb_dvr_poll,
1394 .llseek = default_llseek,
1395 #ifdef CONFIG_DVB_MMAP
1396 .mmap = dvb_dvr_mmap,
1397 #endif
1398 };
1399
1400 static const struct dvb_device dvbdev_dvr = {
1401 .priv = NULL,
1402 .readers = 1,
1403 .users = 1,
1404 #if defined(CONFIG_MEDIA_CONTROLLER_DVB)
1405 .name = "dvb-dvr",
1406 #endif
1407 .fops = &dvb_dvr_fops
1408 };
dvb_dmxdev_init(struct dmxdev * dmxdev,struct dvb_adapter * dvb_adapter)1409 int dvb_dmxdev_init(struct dmxdev *dmxdev, struct dvb_adapter *dvb_adapter)
1410 {
1411 int i, ret;
1412
1413 if (dmxdev->demux->open(dmxdev->demux) < 0)
1414 return -EUSERS;
1415
1416 dmxdev->filter = vmalloc(array_size(sizeof(struct dmxdev_filter),
1417 dmxdev->filternum));
1418 if (!dmxdev->filter)
1419 return -ENOMEM;
1420
1421 mutex_init(&dmxdev->mutex);
1422 spin_lock_init(&dmxdev->lock);
1423 for (i = 0; i < dmxdev->filternum; i++) {
1424 dmxdev->filter[i].dev = dmxdev;
1425 dmxdev->filter[i].buffer.data = NULL;
1426 dvb_dmxdev_filter_state_set(&dmxdev->filter[i],
1427 DMXDEV_STATE_FREE);
1428 }
1429
1430 ret = dvb_register_device(dvb_adapter, &dmxdev->dvbdev, &dvbdev_demux, dmxdev,
1431 DVB_DEVICE_DEMUX, dmxdev->filternum);
1432 if (ret < 0)
1433 goto err_register_dvbdev;
1434
1435 ret = dvb_register_device(dvb_adapter, &dmxdev->dvr_dvbdev, &dvbdev_dvr,
1436 dmxdev, DVB_DEVICE_DVR, dmxdev->filternum);
1437 if (ret < 0)
1438 goto err_register_dvr_dvbdev;
1439
1440 dvb_ringbuffer_init(&dmxdev->dvr_buffer, NULL, 8192);
1441
1442 return 0;
1443
1444 err_register_dvr_dvbdev:
1445 dvb_unregister_device(dmxdev->dvbdev);
1446 err_register_dvbdev:
1447 vfree(dmxdev->filter);
1448 dmxdev->filter = NULL;
1449 return ret;
1450 }
1451
1452 EXPORT_SYMBOL(dvb_dmxdev_init);
1453
dvb_dmxdev_release(struct dmxdev * dmxdev)1454 void dvb_dmxdev_release(struct dmxdev *dmxdev)
1455 {
1456 mutex_lock(&dmxdev->mutex);
1457 dmxdev->exit = 1;
1458 mutex_unlock(&dmxdev->mutex);
1459
1460 if (dmxdev->dvbdev->users > 1) {
1461 wait_event(dmxdev->dvbdev->wait_queue,
1462 dmxdev->dvbdev->users == 1);
1463 }
1464 if (dmxdev->dvr_dvbdev->users > 1) {
1465 wait_event(dmxdev->dvr_dvbdev->wait_queue,
1466 dmxdev->dvr_dvbdev->users == 1);
1467 }
1468
1469 dvb_unregister_device(dmxdev->dvbdev);
1470 dvb_unregister_device(dmxdev->dvr_dvbdev);
1471
1472 vfree(dmxdev->filter);
1473 dmxdev->filter = NULL;
1474 dmxdev->demux->close(dmxdev->demux);
1475 }
1476
1477 EXPORT_SYMBOL(dvb_dmxdev_release);
1478