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 = timer_container_of(dmxdevfilter,
356 t, timer);
357
358 dmxdevfilter->buffer.error = -ETIMEDOUT;
359 spin_lock_irq(&dmxdevfilter->dev->lock);
360 dmxdevfilter->state = DMXDEV_STATE_TIMEDOUT;
361 spin_unlock_irq(&dmxdevfilter->dev->lock);
362 wake_up(&dmxdevfilter->buffer.queue);
363 }
364
dvb_dmxdev_filter_timer(struct dmxdev_filter * dmxdevfilter)365 static void dvb_dmxdev_filter_timer(struct dmxdev_filter *dmxdevfilter)
366 {
367 struct dmx_sct_filter_params *para = &dmxdevfilter->params.sec;
368
369 timer_delete(&dmxdevfilter->timer);
370 if (para->timeout) {
371 dmxdevfilter->timer.expires =
372 jiffies + 1 + (HZ / 2 + HZ * para->timeout) / 1000;
373 add_timer(&dmxdevfilter->timer);
374 }
375 }
376
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)377 static int dvb_dmxdev_section_callback(const u8 *buffer1, size_t buffer1_len,
378 const u8 *buffer2, size_t buffer2_len,
379 struct dmx_section_filter *filter,
380 u32 *buffer_flags)
381 {
382 struct dmxdev_filter *dmxdevfilter = filter->priv;
383 int ret;
384
385 if (!dvb_vb2_is_streaming(&dmxdevfilter->vb2_ctx) &&
386 dmxdevfilter->buffer.error) {
387 wake_up(&dmxdevfilter->buffer.queue);
388 return 0;
389 }
390 spin_lock(&dmxdevfilter->dev->lock);
391 if (dmxdevfilter->state != DMXDEV_STATE_GO) {
392 spin_unlock(&dmxdevfilter->dev->lock);
393 return 0;
394 }
395 timer_delete(&dmxdevfilter->timer);
396 dprintk("section callback %*ph\n", 6, buffer1);
397 if (dvb_vb2_is_streaming(&dmxdevfilter->vb2_ctx)) {
398 ret = dvb_vb2_fill_buffer(&dmxdevfilter->vb2_ctx,
399 buffer1, buffer1_len,
400 buffer_flags);
401 if (ret == buffer1_len)
402 ret = dvb_vb2_fill_buffer(&dmxdevfilter->vb2_ctx,
403 buffer2, buffer2_len,
404 buffer_flags);
405 } else {
406 ret = dvb_dmxdev_buffer_write(&dmxdevfilter->buffer,
407 buffer1, buffer1_len);
408 if (ret == buffer1_len) {
409 ret = dvb_dmxdev_buffer_write(&dmxdevfilter->buffer,
410 buffer2, buffer2_len);
411 }
412 }
413 if (ret < 0)
414 dmxdevfilter->buffer.error = ret;
415 if (dmxdevfilter->params.sec.flags & DMX_ONESHOT)
416 dmxdevfilter->state = DMXDEV_STATE_DONE;
417 spin_unlock(&dmxdevfilter->dev->lock);
418 wake_up(&dmxdevfilter->buffer.queue);
419 return 0;
420 }
421
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)422 static int dvb_dmxdev_ts_callback(const u8 *buffer1, size_t buffer1_len,
423 const u8 *buffer2, size_t buffer2_len,
424 struct dmx_ts_feed *feed,
425 u32 *buffer_flags)
426 {
427 struct dmxdev_filter *dmxdevfilter = feed->priv;
428 struct dvb_ringbuffer *buffer;
429 #ifdef CONFIG_DVB_MMAP
430 struct dvb_vb2_ctx *ctx;
431 #endif
432 int ret;
433
434 spin_lock(&dmxdevfilter->dev->lock);
435 if (dmxdevfilter->params.pes.output == DMX_OUT_DECODER) {
436 spin_unlock(&dmxdevfilter->dev->lock);
437 return 0;
438 }
439
440 if (dmxdevfilter->params.pes.output == DMX_OUT_TAP ||
441 dmxdevfilter->params.pes.output == DMX_OUT_TSDEMUX_TAP) {
442 buffer = &dmxdevfilter->buffer;
443 #ifdef CONFIG_DVB_MMAP
444 ctx = &dmxdevfilter->vb2_ctx;
445 #endif
446 } else {
447 buffer = &dmxdevfilter->dev->dvr_buffer;
448 #ifdef CONFIG_DVB_MMAP
449 ctx = &dmxdevfilter->dev->dvr_vb2_ctx;
450 #endif
451 }
452
453 if (dvb_vb2_is_streaming(ctx)) {
454 ret = dvb_vb2_fill_buffer(ctx, buffer1, buffer1_len,
455 buffer_flags);
456 if (ret == buffer1_len)
457 ret = dvb_vb2_fill_buffer(ctx, buffer2, buffer2_len,
458 buffer_flags);
459 } else {
460 if (buffer->error) {
461 spin_unlock(&dmxdevfilter->dev->lock);
462 wake_up(&buffer->queue);
463 return 0;
464 }
465 ret = dvb_dmxdev_buffer_write(buffer, buffer1, buffer1_len);
466 if (ret == buffer1_len)
467 ret = dvb_dmxdev_buffer_write(buffer,
468 buffer2, buffer2_len);
469 }
470 if (ret < 0)
471 buffer->error = ret;
472 spin_unlock(&dmxdevfilter->dev->lock);
473 wake_up(&buffer->queue);
474 return 0;
475 }
476
477 /* stop feed but only mark the specified filter as stopped (state set) */
dvb_dmxdev_feed_stop(struct dmxdev_filter * dmxdevfilter)478 static int dvb_dmxdev_feed_stop(struct dmxdev_filter *dmxdevfilter)
479 {
480 struct dmxdev_feed *feed;
481
482 dvb_dmxdev_filter_state_set(dmxdevfilter, DMXDEV_STATE_SET);
483
484 switch (dmxdevfilter->type) {
485 case DMXDEV_TYPE_SEC:
486 timer_delete(&dmxdevfilter->timer);
487 dmxdevfilter->feed.sec->stop_filtering(dmxdevfilter->feed.sec);
488 break;
489 case DMXDEV_TYPE_PES:
490 list_for_each_entry(feed, &dmxdevfilter->feed.ts, next)
491 feed->ts->stop_filtering(feed->ts);
492 break;
493 default:
494 return -EINVAL;
495 }
496 return 0;
497 }
498
499 /* start feed associated with the specified filter */
dvb_dmxdev_feed_start(struct dmxdev_filter * filter)500 static int dvb_dmxdev_feed_start(struct dmxdev_filter *filter)
501 {
502 struct dmxdev_feed *feed;
503 int ret;
504
505 dvb_dmxdev_filter_state_set(filter, DMXDEV_STATE_GO);
506
507 switch (filter->type) {
508 case DMXDEV_TYPE_SEC:
509 return filter->feed.sec->start_filtering(filter->feed.sec);
510 case DMXDEV_TYPE_PES:
511 list_for_each_entry(feed, &filter->feed.ts, next) {
512 ret = feed->ts->start_filtering(feed->ts);
513 if (ret < 0) {
514 dvb_dmxdev_feed_stop(filter);
515 return ret;
516 }
517 }
518 break;
519 default:
520 return -EINVAL;
521 }
522
523 return 0;
524 }
525
526 /* restart section feed if it has filters left associated with it,
527 otherwise release the feed */
dvb_dmxdev_feed_restart(struct dmxdev_filter * filter)528 static int dvb_dmxdev_feed_restart(struct dmxdev_filter *filter)
529 {
530 int i;
531 struct dmxdev *dmxdev = filter->dev;
532 u16 pid = filter->params.sec.pid;
533
534 for (i = 0; i < dmxdev->filternum; i++)
535 if (dmxdev->filter[i].state >= DMXDEV_STATE_GO &&
536 dmxdev->filter[i].type == DMXDEV_TYPE_SEC &&
537 dmxdev->filter[i].params.sec.pid == pid) {
538 dvb_dmxdev_feed_start(&dmxdev->filter[i]);
539 return 0;
540 }
541
542 filter->dev->demux->release_section_feed(dmxdev->demux,
543 filter->feed.sec);
544
545 return 0;
546 }
547
dvb_dmxdev_filter_stop(struct dmxdev_filter * dmxdevfilter)548 static int dvb_dmxdev_filter_stop(struct dmxdev_filter *dmxdevfilter)
549 {
550 struct dmxdev_feed *feed;
551 struct dmx_demux *demux;
552
553 if (dmxdevfilter->state < DMXDEV_STATE_GO)
554 return 0;
555
556 switch (dmxdevfilter->type) {
557 case DMXDEV_TYPE_SEC:
558 if (!dmxdevfilter->feed.sec)
559 break;
560 dvb_dmxdev_feed_stop(dmxdevfilter);
561 if (dmxdevfilter->filter.sec)
562 dmxdevfilter->feed.sec->
563 release_filter(dmxdevfilter->feed.sec,
564 dmxdevfilter->filter.sec);
565 dvb_dmxdev_feed_restart(dmxdevfilter);
566 dmxdevfilter->feed.sec = NULL;
567 break;
568 case DMXDEV_TYPE_PES:
569 dvb_dmxdev_feed_stop(dmxdevfilter);
570 demux = dmxdevfilter->dev->demux;
571 list_for_each_entry(feed, &dmxdevfilter->feed.ts, next) {
572 demux->release_ts_feed(demux, feed->ts);
573 feed->ts = NULL;
574 }
575 break;
576 default:
577 if (dmxdevfilter->state == DMXDEV_STATE_ALLOCATED)
578 return 0;
579 return -EINVAL;
580 }
581
582 dvb_ringbuffer_flush(&dmxdevfilter->buffer);
583 return 0;
584 }
585
dvb_dmxdev_delete_pids(struct dmxdev_filter * dmxdevfilter)586 static void dvb_dmxdev_delete_pids(struct dmxdev_filter *dmxdevfilter)
587 {
588 struct dmxdev_feed *feed, *tmp;
589
590 /* delete all PIDs */
591 list_for_each_entry_safe(feed, tmp, &dmxdevfilter->feed.ts, next) {
592 list_del(&feed->next);
593 kfree(feed);
594 }
595
596 BUG_ON(!list_empty(&dmxdevfilter->feed.ts));
597 }
598
dvb_dmxdev_filter_reset(struct dmxdev_filter * dmxdevfilter)599 static inline int dvb_dmxdev_filter_reset(struct dmxdev_filter *dmxdevfilter)
600 {
601 if (dmxdevfilter->state < DMXDEV_STATE_SET)
602 return 0;
603
604 if (dmxdevfilter->type == DMXDEV_TYPE_PES)
605 dvb_dmxdev_delete_pids(dmxdevfilter);
606
607 dmxdevfilter->type = DMXDEV_TYPE_NONE;
608 dvb_dmxdev_filter_state_set(dmxdevfilter, DMXDEV_STATE_ALLOCATED);
609 return 0;
610 }
611
dvb_dmxdev_start_feed(struct dmxdev * dmxdev,struct dmxdev_filter * filter,struct dmxdev_feed * feed)612 static int dvb_dmxdev_start_feed(struct dmxdev *dmxdev,
613 struct dmxdev_filter *filter,
614 struct dmxdev_feed *feed)
615 {
616 ktime_t timeout = ktime_set(0, 0);
617 struct dmx_pes_filter_params *para = &filter->params.pes;
618 enum dmx_output otype;
619 int ret;
620 int ts_type;
621 enum dmx_ts_pes ts_pes;
622 struct dmx_ts_feed *tsfeed;
623
624 feed->ts = NULL;
625 otype = para->output;
626
627 ts_pes = para->pes_type;
628
629 if (ts_pes < DMX_PES_OTHER)
630 ts_type = TS_DECODER;
631 else
632 ts_type = 0;
633
634 if (otype == DMX_OUT_TS_TAP)
635 ts_type |= TS_PACKET;
636 else if (otype == DMX_OUT_TSDEMUX_TAP)
637 ts_type |= TS_PACKET | TS_DEMUX;
638 else if (otype == DMX_OUT_TAP)
639 ts_type |= TS_PACKET | TS_DEMUX | TS_PAYLOAD_ONLY;
640
641 ret = dmxdev->demux->allocate_ts_feed(dmxdev->demux, &feed->ts,
642 dvb_dmxdev_ts_callback);
643 if (ret < 0)
644 return ret;
645
646 tsfeed = feed->ts;
647 tsfeed->priv = filter;
648
649 ret = tsfeed->set(tsfeed, feed->pid, ts_type, ts_pes, timeout);
650 if (ret < 0) {
651 dmxdev->demux->release_ts_feed(dmxdev->demux, tsfeed);
652 return ret;
653 }
654
655 ret = tsfeed->start_filtering(tsfeed);
656 if (ret < 0) {
657 dmxdev->demux->release_ts_feed(dmxdev->demux, tsfeed);
658 return ret;
659 }
660
661 return 0;
662 }
663
dvb_dmxdev_filter_start(struct dmxdev_filter * filter)664 static int dvb_dmxdev_filter_start(struct dmxdev_filter *filter)
665 {
666 struct dmxdev *dmxdev = filter->dev;
667 struct dmxdev_feed *feed;
668 void *mem;
669 int ret, i;
670
671 if (filter->state < DMXDEV_STATE_SET)
672 return -EINVAL;
673
674 if (filter->state >= DMXDEV_STATE_GO)
675 dvb_dmxdev_filter_stop(filter);
676
677 if (!filter->buffer.data) {
678 mem = vmalloc(filter->buffer.size);
679 if (!mem)
680 return -ENOMEM;
681 spin_lock_irq(&filter->dev->lock);
682 filter->buffer.data = mem;
683 spin_unlock_irq(&filter->dev->lock);
684 }
685
686 dvb_ringbuffer_flush(&filter->buffer);
687
688 switch (filter->type) {
689 case DMXDEV_TYPE_SEC:
690 {
691 struct dmx_sct_filter_params *para = &filter->params.sec;
692 struct dmx_section_filter **secfilter = &filter->filter.sec;
693 struct dmx_section_feed **secfeed = &filter->feed.sec;
694
695 *secfilter = NULL;
696 *secfeed = NULL;
697
698
699 /* find active filter/feed with same PID */
700 for (i = 0; i < dmxdev->filternum; i++) {
701 if (dmxdev->filter[i].state >= DMXDEV_STATE_GO &&
702 dmxdev->filter[i].type == DMXDEV_TYPE_SEC &&
703 dmxdev->filter[i].params.sec.pid == para->pid) {
704 *secfeed = dmxdev->filter[i].feed.sec;
705 break;
706 }
707 }
708
709 /* if no feed found, try to allocate new one */
710 if (!*secfeed) {
711 ret = dmxdev->demux->allocate_section_feed(dmxdev->demux,
712 secfeed,
713 dvb_dmxdev_section_callback);
714 if (!*secfeed) {
715 pr_err("DVB (%s): could not alloc feed\n",
716 __func__);
717 return ret;
718 }
719
720 ret = (*secfeed)->set(*secfeed, para->pid,
721 (para->flags & DMX_CHECK_CRC) ? 1 : 0);
722 if (ret < 0) {
723 pr_err("DVB (%s): could not set feed\n",
724 __func__);
725 dvb_dmxdev_feed_restart(filter);
726 return ret;
727 }
728 } else {
729 dvb_dmxdev_feed_stop(filter);
730 }
731
732 ret = (*secfeed)->allocate_filter(*secfeed, secfilter);
733 if (ret < 0) {
734 dvb_dmxdev_feed_restart(filter);
735 *secfeed = NULL;
736 dprintk("could not get filter\n");
737 return ret;
738 }
739
740 (*secfilter)->priv = filter;
741
742 memcpy(&((*secfilter)->filter_value[3]),
743 &(para->filter.filter[1]), DMX_FILTER_SIZE - 1);
744 memcpy(&(*secfilter)->filter_mask[3],
745 ¶->filter.mask[1], DMX_FILTER_SIZE - 1);
746 memcpy(&(*secfilter)->filter_mode[3],
747 ¶->filter.mode[1], DMX_FILTER_SIZE - 1);
748
749 (*secfilter)->filter_value[0] = para->filter.filter[0];
750 (*secfilter)->filter_mask[0] = para->filter.mask[0];
751 (*secfilter)->filter_mode[0] = para->filter.mode[0];
752 (*secfilter)->filter_mask[1] = 0;
753 (*secfilter)->filter_mask[2] = 0;
754
755 filter->todo = 0;
756
757 ret = filter->feed.sec->start_filtering(filter->feed.sec);
758 if (ret < 0)
759 return ret;
760
761 dvb_dmxdev_filter_timer(filter);
762 break;
763 }
764 case DMXDEV_TYPE_PES:
765 list_for_each_entry(feed, &filter->feed.ts, next) {
766 ret = dvb_dmxdev_start_feed(dmxdev, filter, feed);
767 if (ret < 0) {
768 dvb_dmxdev_filter_stop(filter);
769 return ret;
770 }
771 }
772 break;
773 default:
774 return -EINVAL;
775 }
776
777 dvb_dmxdev_filter_state_set(filter, DMXDEV_STATE_GO);
778 return 0;
779 }
780
dvb_demux_open(struct inode * inode,struct file * file)781 static int dvb_demux_open(struct inode *inode, struct file *file)
782 {
783 struct dvb_device *dvbdev = file->private_data;
784 struct dmxdev *dmxdev = dvbdev->priv;
785 int i;
786 struct dmxdev_filter *dmxdevfilter;
787
788 if (!dmxdev->filter)
789 return -EINVAL;
790
791 if (mutex_lock_interruptible(&dmxdev->mutex))
792 return -ERESTARTSYS;
793
794 if (dmxdev->exit) {
795 mutex_unlock(&dmxdev->mutex);
796 return -ENODEV;
797 }
798
799 for (i = 0; i < dmxdev->filternum; i++)
800 if (dmxdev->filter[i].state == DMXDEV_STATE_FREE)
801 break;
802
803 if (i == dmxdev->filternum) {
804 mutex_unlock(&dmxdev->mutex);
805 return -EMFILE;
806 }
807
808 dmxdevfilter = &dmxdev->filter[i];
809 mutex_init(&dmxdevfilter->mutex);
810 file->private_data = dmxdevfilter;
811
812 #ifdef CONFIG_DVB_MMAP
813 dmxdev->may_do_mmap = 1;
814 #else
815 dmxdev->may_do_mmap = 0;
816 #endif
817
818 dvb_ringbuffer_init(&dmxdevfilter->buffer, NULL, 8192);
819 dvb_vb2_init(&dmxdevfilter->vb2_ctx, "demux_filter",
820 file->f_flags & O_NONBLOCK);
821 dmxdevfilter->type = DMXDEV_TYPE_NONE;
822 dvb_dmxdev_filter_state_set(dmxdevfilter, DMXDEV_STATE_ALLOCATED);
823 timer_setup(&dmxdevfilter->timer, dvb_dmxdev_filter_timeout, 0);
824
825 dvbdev->users++;
826
827 mutex_unlock(&dmxdev->mutex);
828 return 0;
829 }
830
dvb_dmxdev_filter_free(struct dmxdev * dmxdev,struct dmxdev_filter * dmxdevfilter)831 static int dvb_dmxdev_filter_free(struct dmxdev *dmxdev,
832 struct dmxdev_filter *dmxdevfilter)
833 {
834 mutex_lock(&dmxdev->mutex);
835 mutex_lock(&dmxdevfilter->mutex);
836 if (dvb_vb2_is_streaming(&dmxdevfilter->vb2_ctx))
837 dvb_vb2_stream_off(&dmxdevfilter->vb2_ctx);
838 dvb_vb2_release(&dmxdevfilter->vb2_ctx);
839
840
841 dvb_dmxdev_filter_stop(dmxdevfilter);
842 dvb_dmxdev_filter_reset(dmxdevfilter);
843
844 if (dmxdevfilter->buffer.data) {
845 void *mem = dmxdevfilter->buffer.data;
846
847 spin_lock_irq(&dmxdev->lock);
848 dmxdevfilter->buffer.data = NULL;
849 spin_unlock_irq(&dmxdev->lock);
850 vfree(mem);
851 }
852
853 dvb_dmxdev_filter_state_set(dmxdevfilter, DMXDEV_STATE_FREE);
854 wake_up(&dmxdevfilter->buffer.queue);
855 mutex_unlock(&dmxdevfilter->mutex);
856 mutex_unlock(&dmxdev->mutex);
857 return 0;
858 }
859
invert_mode(struct dmx_filter * filter)860 static inline void invert_mode(struct dmx_filter *filter)
861 {
862 int i;
863
864 for (i = 0; i < DMX_FILTER_SIZE; i++)
865 filter->mode[i] ^= 0xff;
866 }
867
dvb_dmxdev_add_pid(struct dmxdev * dmxdev,struct dmxdev_filter * filter,u16 pid)868 static int dvb_dmxdev_add_pid(struct dmxdev *dmxdev,
869 struct dmxdev_filter *filter, u16 pid)
870 {
871 struct dmxdev_feed *feed;
872
873 if ((filter->type != DMXDEV_TYPE_PES) ||
874 (filter->state < DMXDEV_STATE_SET))
875 return -EINVAL;
876
877 /* only TS packet filters may have multiple PIDs */
878 if ((filter->params.pes.output != DMX_OUT_TSDEMUX_TAP) &&
879 (!list_empty(&filter->feed.ts)))
880 return -EINVAL;
881
882 feed = kzalloc(sizeof(struct dmxdev_feed), GFP_KERNEL);
883 if (feed == NULL)
884 return -ENOMEM;
885
886 feed->pid = pid;
887 list_add(&feed->next, &filter->feed.ts);
888
889 if (filter->state >= DMXDEV_STATE_GO)
890 return dvb_dmxdev_start_feed(dmxdev, filter, feed);
891
892 return 0;
893 }
894
dvb_dmxdev_remove_pid(struct dmxdev * dmxdev,struct dmxdev_filter * filter,u16 pid)895 static int dvb_dmxdev_remove_pid(struct dmxdev *dmxdev,
896 struct dmxdev_filter *filter, u16 pid)
897 {
898 struct dmxdev_feed *feed, *tmp;
899
900 if ((filter->type != DMXDEV_TYPE_PES) ||
901 (filter->state < DMXDEV_STATE_SET))
902 return -EINVAL;
903
904 list_for_each_entry_safe(feed, tmp, &filter->feed.ts, next) {
905 if ((feed->pid == pid) && (feed->ts != NULL)) {
906 feed->ts->stop_filtering(feed->ts);
907 filter->dev->demux->release_ts_feed(filter->dev->demux,
908 feed->ts);
909 list_del(&feed->next);
910 kfree(feed);
911 }
912 }
913
914 return 0;
915 }
916
dvb_dmxdev_filter_set(struct dmxdev * dmxdev,struct dmxdev_filter * dmxdevfilter,struct dmx_sct_filter_params * params)917 static int dvb_dmxdev_filter_set(struct dmxdev *dmxdev,
918 struct dmxdev_filter *dmxdevfilter,
919 struct dmx_sct_filter_params *params)
920 {
921 dprintk("%s: PID=0x%04x, flags=%02x, timeout=%d\n",
922 __func__, params->pid, params->flags, params->timeout);
923
924 dvb_dmxdev_filter_stop(dmxdevfilter);
925
926 dmxdevfilter->type = DMXDEV_TYPE_SEC;
927 memcpy(&dmxdevfilter->params.sec,
928 params, sizeof(struct dmx_sct_filter_params));
929 invert_mode(&dmxdevfilter->params.sec.filter);
930 dvb_dmxdev_filter_state_set(dmxdevfilter, DMXDEV_STATE_SET);
931
932 if (params->flags & DMX_IMMEDIATE_START)
933 return dvb_dmxdev_filter_start(dmxdevfilter);
934
935 return 0;
936 }
937
dvb_dmxdev_pes_filter_set(struct dmxdev * dmxdev,struct dmxdev_filter * dmxdevfilter,struct dmx_pes_filter_params * params)938 static int dvb_dmxdev_pes_filter_set(struct dmxdev *dmxdev,
939 struct dmxdev_filter *dmxdevfilter,
940 struct dmx_pes_filter_params *params)
941 {
942 int ret;
943
944 dvb_dmxdev_filter_stop(dmxdevfilter);
945 dvb_dmxdev_filter_reset(dmxdevfilter);
946
947 if ((unsigned int)params->pes_type > DMX_PES_OTHER)
948 return -EINVAL;
949
950 dmxdevfilter->type = DMXDEV_TYPE_PES;
951 memcpy(&dmxdevfilter->params, params,
952 sizeof(struct dmx_pes_filter_params));
953 INIT_LIST_HEAD(&dmxdevfilter->feed.ts);
954
955 dvb_dmxdev_filter_state_set(dmxdevfilter, DMXDEV_STATE_SET);
956
957 ret = dvb_dmxdev_add_pid(dmxdev, dmxdevfilter,
958 dmxdevfilter->params.pes.pid);
959 if (ret < 0)
960 return ret;
961
962 if (params->flags & DMX_IMMEDIATE_START)
963 return dvb_dmxdev_filter_start(dmxdevfilter);
964
965 return 0;
966 }
967
dvb_dmxdev_read_sec(struct dmxdev_filter * dfil,struct file * file,char __user * buf,size_t count,loff_t * ppos)968 static ssize_t dvb_dmxdev_read_sec(struct dmxdev_filter *dfil,
969 struct file *file, char __user *buf,
970 size_t count, loff_t *ppos)
971 {
972 int result, hcount;
973 int done = 0;
974
975 if (dfil->todo <= 0) {
976 hcount = 3 + dfil->todo;
977 if (hcount > count)
978 hcount = count;
979 result = dvb_dmxdev_buffer_read(&dfil->buffer,
980 file->f_flags & O_NONBLOCK,
981 buf, hcount, ppos);
982 if (result < 0) {
983 dfil->todo = 0;
984 return result;
985 }
986 if (copy_from_user(dfil->secheader - dfil->todo, buf, result))
987 return -EFAULT;
988 buf += result;
989 done = result;
990 count -= result;
991 dfil->todo -= result;
992 if (dfil->todo > -3)
993 return done;
994 dfil->todo = ((dfil->secheader[1] << 8) | dfil->secheader[2]) & 0xfff;
995 if (!count)
996 return done;
997 }
998 if (count > dfil->todo)
999 count = dfil->todo;
1000 result = dvb_dmxdev_buffer_read(&dfil->buffer,
1001 file->f_flags & O_NONBLOCK,
1002 buf, count, ppos);
1003 if (result < 0)
1004 return result;
1005 dfil->todo -= result;
1006 return (result + done);
1007 }
1008
1009 static ssize_t
dvb_demux_read(struct file * file,char __user * buf,size_t count,loff_t * ppos)1010 dvb_demux_read(struct file *file, char __user *buf, size_t count,
1011 loff_t *ppos)
1012 {
1013 struct dmxdev_filter *dmxdevfilter = file->private_data;
1014 int ret;
1015
1016 if (mutex_lock_interruptible(&dmxdevfilter->mutex))
1017 return -ERESTARTSYS;
1018
1019 if (dmxdevfilter->type == DMXDEV_TYPE_SEC)
1020 ret = dvb_dmxdev_read_sec(dmxdevfilter, file, buf, count, ppos);
1021 else
1022 ret = dvb_dmxdev_buffer_read(&dmxdevfilter->buffer,
1023 file->f_flags & O_NONBLOCK,
1024 buf, count, ppos);
1025
1026 mutex_unlock(&dmxdevfilter->mutex);
1027 return ret;
1028 }
1029
dvb_demux_do_ioctl(struct file * file,unsigned int cmd,void * parg)1030 static int dvb_demux_do_ioctl(struct file *file,
1031 unsigned int cmd, void *parg)
1032 {
1033 struct dmxdev_filter *dmxdevfilter = file->private_data;
1034 struct dmxdev *dmxdev = dmxdevfilter->dev;
1035 unsigned long arg = (unsigned long)parg;
1036 int ret = 0;
1037
1038 if (mutex_lock_interruptible(&dmxdev->mutex))
1039 return -ERESTARTSYS;
1040
1041 switch (cmd) {
1042 case DMX_START:
1043 if (mutex_lock_interruptible(&dmxdevfilter->mutex)) {
1044 mutex_unlock(&dmxdev->mutex);
1045 return -ERESTARTSYS;
1046 }
1047 if (dmxdevfilter->state < DMXDEV_STATE_SET)
1048 ret = -EINVAL;
1049 else
1050 ret = dvb_dmxdev_filter_start(dmxdevfilter);
1051 mutex_unlock(&dmxdevfilter->mutex);
1052 break;
1053
1054 case DMX_STOP:
1055 if (mutex_lock_interruptible(&dmxdevfilter->mutex)) {
1056 mutex_unlock(&dmxdev->mutex);
1057 return -ERESTARTSYS;
1058 }
1059 ret = dvb_dmxdev_filter_stop(dmxdevfilter);
1060 mutex_unlock(&dmxdevfilter->mutex);
1061 break;
1062
1063 case DMX_SET_FILTER:
1064 if (mutex_lock_interruptible(&dmxdevfilter->mutex)) {
1065 mutex_unlock(&dmxdev->mutex);
1066 return -ERESTARTSYS;
1067 }
1068 ret = dvb_dmxdev_filter_set(dmxdev, dmxdevfilter, parg);
1069 mutex_unlock(&dmxdevfilter->mutex);
1070 break;
1071
1072 case DMX_SET_PES_FILTER:
1073 if (mutex_lock_interruptible(&dmxdevfilter->mutex)) {
1074 mutex_unlock(&dmxdev->mutex);
1075 return -ERESTARTSYS;
1076 }
1077 ret = dvb_dmxdev_pes_filter_set(dmxdev, dmxdevfilter, parg);
1078 mutex_unlock(&dmxdevfilter->mutex);
1079 break;
1080
1081 case DMX_SET_BUFFER_SIZE:
1082 if (mutex_lock_interruptible(&dmxdevfilter->mutex)) {
1083 mutex_unlock(&dmxdev->mutex);
1084 return -ERESTARTSYS;
1085 }
1086 ret = dvb_dmxdev_set_buffer_size(dmxdevfilter, arg);
1087 mutex_unlock(&dmxdevfilter->mutex);
1088 break;
1089
1090 case DMX_GET_PES_PIDS:
1091 if (!dmxdev->demux->get_pes_pids) {
1092 ret = -EINVAL;
1093 break;
1094 }
1095 dmxdev->demux->get_pes_pids(dmxdev->demux, parg);
1096 break;
1097
1098 case DMX_GET_STC:
1099 if (!dmxdev->demux->get_stc) {
1100 ret = -EINVAL;
1101 break;
1102 }
1103 ret = dmxdev->demux->get_stc(dmxdev->demux,
1104 ((struct dmx_stc *)parg)->num,
1105 &((struct dmx_stc *)parg)->stc,
1106 &((struct dmx_stc *)parg)->base);
1107 break;
1108
1109 case DMX_ADD_PID:
1110 if (mutex_lock_interruptible(&dmxdevfilter->mutex)) {
1111 ret = -ERESTARTSYS;
1112 break;
1113 }
1114 ret = dvb_dmxdev_add_pid(dmxdev, dmxdevfilter, *(u16 *)parg);
1115 mutex_unlock(&dmxdevfilter->mutex);
1116 break;
1117
1118 case DMX_REMOVE_PID:
1119 if (mutex_lock_interruptible(&dmxdevfilter->mutex)) {
1120 ret = -ERESTARTSYS;
1121 break;
1122 }
1123 ret = dvb_dmxdev_remove_pid(dmxdev, dmxdevfilter, *(u16 *)parg);
1124 mutex_unlock(&dmxdevfilter->mutex);
1125 break;
1126
1127 #ifdef CONFIG_DVB_MMAP
1128 case DMX_REQBUFS:
1129 if (mutex_lock_interruptible(&dmxdevfilter->mutex)) {
1130 mutex_unlock(&dmxdev->mutex);
1131 return -ERESTARTSYS;
1132 }
1133 ret = dvb_vb2_reqbufs(&dmxdevfilter->vb2_ctx, parg);
1134 mutex_unlock(&dmxdevfilter->mutex);
1135 break;
1136
1137 case DMX_QUERYBUF:
1138 if (mutex_lock_interruptible(&dmxdevfilter->mutex)) {
1139 mutex_unlock(&dmxdev->mutex);
1140 return -ERESTARTSYS;
1141 }
1142 ret = dvb_vb2_querybuf(&dmxdevfilter->vb2_ctx, parg);
1143 mutex_unlock(&dmxdevfilter->mutex);
1144 break;
1145
1146 case DMX_EXPBUF:
1147 if (mutex_lock_interruptible(&dmxdevfilter->mutex)) {
1148 mutex_unlock(&dmxdev->mutex);
1149 return -ERESTARTSYS;
1150 }
1151 ret = dvb_vb2_expbuf(&dmxdevfilter->vb2_ctx, parg);
1152 mutex_unlock(&dmxdevfilter->mutex);
1153 break;
1154
1155 case DMX_QBUF:
1156 if (mutex_lock_interruptible(&dmxdevfilter->mutex)) {
1157 mutex_unlock(&dmxdev->mutex);
1158 return -ERESTARTSYS;
1159 }
1160 ret = dvb_vb2_qbuf(&dmxdevfilter->vb2_ctx, parg);
1161 if (ret == 0 && !dvb_vb2_is_streaming(&dmxdevfilter->vb2_ctx))
1162 ret = dvb_vb2_stream_on(&dmxdevfilter->vb2_ctx);
1163 mutex_unlock(&dmxdevfilter->mutex);
1164 break;
1165
1166 case DMX_DQBUF:
1167 if (mutex_lock_interruptible(&dmxdevfilter->mutex)) {
1168 mutex_unlock(&dmxdev->mutex);
1169 return -ERESTARTSYS;
1170 }
1171 ret = dvb_vb2_dqbuf(&dmxdevfilter->vb2_ctx, parg);
1172 mutex_unlock(&dmxdevfilter->mutex);
1173 break;
1174 #endif
1175 default:
1176 ret = -ENOTTY;
1177 break;
1178 }
1179 mutex_unlock(&dmxdev->mutex);
1180 return ret;
1181 }
1182
dvb_demux_ioctl(struct file * file,unsigned int cmd,unsigned long arg)1183 static long dvb_demux_ioctl(struct file *file, unsigned int cmd,
1184 unsigned long arg)
1185 {
1186 return dvb_usercopy(file, cmd, arg, dvb_demux_do_ioctl);
1187 }
1188
dvb_demux_poll(struct file * file,poll_table * wait)1189 static __poll_t dvb_demux_poll(struct file *file, poll_table *wait)
1190 {
1191 struct dmxdev_filter *dmxdevfilter = file->private_data;
1192 __poll_t mask = 0;
1193
1194 poll_wait(file, &dmxdevfilter->buffer.queue, wait);
1195
1196 if ((!dmxdevfilter) || dmxdevfilter->dev->exit)
1197 return EPOLLERR;
1198 if (dvb_vb2_is_streaming(&dmxdevfilter->vb2_ctx))
1199 return dvb_vb2_poll(&dmxdevfilter->vb2_ctx, file, wait);
1200
1201 if (dmxdevfilter->state != DMXDEV_STATE_GO &&
1202 dmxdevfilter->state != DMXDEV_STATE_DONE &&
1203 dmxdevfilter->state != DMXDEV_STATE_TIMEDOUT)
1204 return 0;
1205
1206 if (dmxdevfilter->buffer.error)
1207 mask |= (EPOLLIN | EPOLLRDNORM | EPOLLPRI | EPOLLERR);
1208
1209 if (!dvb_ringbuffer_empty(&dmxdevfilter->buffer))
1210 mask |= (EPOLLIN | EPOLLRDNORM | EPOLLPRI);
1211
1212 return mask;
1213 }
1214
1215 #ifdef CONFIG_DVB_MMAP
dvb_demux_mmap(struct file * file,struct vm_area_struct * vma)1216 static int dvb_demux_mmap(struct file *file, struct vm_area_struct *vma)
1217 {
1218 struct dmxdev_filter *dmxdevfilter = file->private_data;
1219 struct dmxdev *dmxdev = dmxdevfilter->dev;
1220 int ret;
1221
1222 if (!dmxdev->may_do_mmap)
1223 return -ENOTTY;
1224
1225 if (mutex_lock_interruptible(&dmxdev->mutex))
1226 return -ERESTARTSYS;
1227
1228 if (mutex_lock_interruptible(&dmxdevfilter->mutex)) {
1229 mutex_unlock(&dmxdev->mutex);
1230 return -ERESTARTSYS;
1231 }
1232 ret = dvb_vb2_mmap(&dmxdevfilter->vb2_ctx, vma);
1233
1234 mutex_unlock(&dmxdevfilter->mutex);
1235 mutex_unlock(&dmxdev->mutex);
1236
1237 return ret;
1238 }
1239 #endif
1240
dvb_demux_release(struct inode * inode,struct file * file)1241 static int dvb_demux_release(struct inode *inode, struct file *file)
1242 {
1243 struct dmxdev_filter *dmxdevfilter = file->private_data;
1244 struct dmxdev *dmxdev = dmxdevfilter->dev;
1245 int ret;
1246
1247 ret = dvb_dmxdev_filter_free(dmxdev, dmxdevfilter);
1248
1249 mutex_lock(&dmxdev->mutex);
1250 dmxdev->dvbdev->users--;
1251 if (dmxdev->dvbdev->users == 1 && dmxdev->exit == 1) {
1252 mutex_unlock(&dmxdev->mutex);
1253 wake_up(&dmxdev->dvbdev->wait_queue);
1254 } else
1255 mutex_unlock(&dmxdev->mutex);
1256
1257 return ret;
1258 }
1259
1260 static const struct file_operations dvb_demux_fops = {
1261 .owner = THIS_MODULE,
1262 .read = dvb_demux_read,
1263 .unlocked_ioctl = dvb_demux_ioctl,
1264 .compat_ioctl = dvb_demux_ioctl,
1265 .open = dvb_demux_open,
1266 .release = dvb_demux_release,
1267 .poll = dvb_demux_poll,
1268 .llseek = default_llseek,
1269 #ifdef CONFIG_DVB_MMAP
1270 .mmap = dvb_demux_mmap,
1271 #endif
1272 };
1273
1274 static const struct dvb_device dvbdev_demux = {
1275 .priv = NULL,
1276 .users = 1,
1277 .writers = 1,
1278 #if defined(CONFIG_MEDIA_CONTROLLER_DVB)
1279 .name = "dvb-demux",
1280 #endif
1281 .fops = &dvb_demux_fops
1282 };
1283
dvb_dvr_do_ioctl(struct file * file,unsigned int cmd,void * parg)1284 static int dvb_dvr_do_ioctl(struct file *file,
1285 unsigned int cmd, void *parg)
1286 {
1287 struct dvb_device *dvbdev = file->private_data;
1288 struct dmxdev *dmxdev = dvbdev->priv;
1289 unsigned long arg = (unsigned long)parg;
1290 int ret;
1291
1292 if (mutex_lock_interruptible(&dmxdev->mutex))
1293 return -ERESTARTSYS;
1294
1295 switch (cmd) {
1296 case DMX_SET_BUFFER_SIZE:
1297 ret = dvb_dvr_set_buffer_size(dmxdev, arg);
1298 break;
1299
1300 #ifdef CONFIG_DVB_MMAP
1301 case DMX_REQBUFS:
1302 ret = dvb_vb2_reqbufs(&dmxdev->dvr_vb2_ctx, parg);
1303 break;
1304
1305 case DMX_QUERYBUF:
1306 ret = dvb_vb2_querybuf(&dmxdev->dvr_vb2_ctx, parg);
1307 break;
1308
1309 case DMX_EXPBUF:
1310 ret = dvb_vb2_expbuf(&dmxdev->dvr_vb2_ctx, parg);
1311 break;
1312
1313 case DMX_QBUF:
1314 ret = dvb_vb2_qbuf(&dmxdev->dvr_vb2_ctx, parg);
1315 if (ret == 0 && !dvb_vb2_is_streaming(&dmxdev->dvr_vb2_ctx))
1316 ret = dvb_vb2_stream_on(&dmxdev->dvr_vb2_ctx);
1317 break;
1318
1319 case DMX_DQBUF:
1320 ret = dvb_vb2_dqbuf(&dmxdev->dvr_vb2_ctx, parg);
1321 break;
1322 #endif
1323 default:
1324 ret = -ENOTTY;
1325 break;
1326 }
1327 mutex_unlock(&dmxdev->mutex);
1328 return ret;
1329 }
1330
dvb_dvr_ioctl(struct file * file,unsigned int cmd,unsigned long arg)1331 static long dvb_dvr_ioctl(struct file *file,
1332 unsigned int cmd, unsigned long arg)
1333 {
1334 return dvb_usercopy(file, cmd, arg, dvb_dvr_do_ioctl);
1335 }
1336
dvb_dvr_poll(struct file * file,poll_table * wait)1337 static __poll_t dvb_dvr_poll(struct file *file, poll_table *wait)
1338 {
1339 struct dvb_device *dvbdev = file->private_data;
1340 struct dmxdev *dmxdev = dvbdev->priv;
1341 __poll_t mask = 0;
1342
1343 dprintk("%s\n", __func__);
1344
1345 poll_wait(file, &dmxdev->dvr_buffer.queue, wait);
1346
1347 if (dmxdev->exit)
1348 return EPOLLERR;
1349 if (dvb_vb2_is_streaming(&dmxdev->dvr_vb2_ctx))
1350 return dvb_vb2_poll(&dmxdev->dvr_vb2_ctx, file, wait);
1351
1352 if (((file->f_flags & O_ACCMODE) == O_RDONLY) ||
1353 dmxdev->may_do_mmap) {
1354 if (dmxdev->dvr_buffer.error)
1355 mask |= (EPOLLIN | EPOLLRDNORM | EPOLLPRI | EPOLLERR);
1356
1357 if (!dvb_ringbuffer_empty(&dmxdev->dvr_buffer))
1358 mask |= (EPOLLIN | EPOLLRDNORM | EPOLLPRI);
1359 } else
1360 mask |= (EPOLLOUT | EPOLLWRNORM | EPOLLPRI);
1361
1362 return mask;
1363 }
1364
1365 #ifdef CONFIG_DVB_MMAP
dvb_dvr_mmap(struct file * file,struct vm_area_struct * vma)1366 static int dvb_dvr_mmap(struct file *file, struct vm_area_struct *vma)
1367 {
1368 struct dvb_device *dvbdev = file->private_data;
1369 struct dmxdev *dmxdev = dvbdev->priv;
1370 int ret;
1371
1372 if (!dmxdev->may_do_mmap)
1373 return -ENOTTY;
1374
1375 if (dmxdev->exit)
1376 return -ENODEV;
1377
1378 if (mutex_lock_interruptible(&dmxdev->mutex))
1379 return -ERESTARTSYS;
1380
1381 ret = dvb_vb2_mmap(&dmxdev->dvr_vb2_ctx, vma);
1382 mutex_unlock(&dmxdev->mutex);
1383 return ret;
1384 }
1385 #endif
1386
1387 static const struct file_operations dvb_dvr_fops = {
1388 .owner = THIS_MODULE,
1389 .read = dvb_dvr_read,
1390 .write = dvb_dvr_write,
1391 .unlocked_ioctl = dvb_dvr_ioctl,
1392 .open = dvb_dvr_open,
1393 .release = dvb_dvr_release,
1394 .poll = dvb_dvr_poll,
1395 .llseek = default_llseek,
1396 #ifdef CONFIG_DVB_MMAP
1397 .mmap = dvb_dvr_mmap,
1398 #endif
1399 };
1400
1401 static const struct dvb_device dvbdev_dvr = {
1402 .priv = NULL,
1403 .readers = 1,
1404 .users = 1,
1405 #if defined(CONFIG_MEDIA_CONTROLLER_DVB)
1406 .name = "dvb-dvr",
1407 #endif
1408 .fops = &dvb_dvr_fops
1409 };
dvb_dmxdev_init(struct dmxdev * dmxdev,struct dvb_adapter * dvb_adapter)1410 int dvb_dmxdev_init(struct dmxdev *dmxdev, struct dvb_adapter *dvb_adapter)
1411 {
1412 int i, ret;
1413
1414 if (dmxdev->demux->open(dmxdev->demux) < 0)
1415 return -EUSERS;
1416
1417 dmxdev->filter = vmalloc(array_size(sizeof(struct dmxdev_filter),
1418 dmxdev->filternum));
1419 if (!dmxdev->filter)
1420 return -ENOMEM;
1421
1422 mutex_init(&dmxdev->mutex);
1423 spin_lock_init(&dmxdev->lock);
1424 for (i = 0; i < dmxdev->filternum; i++) {
1425 dmxdev->filter[i].dev = dmxdev;
1426 dmxdev->filter[i].buffer.data = NULL;
1427 dvb_dmxdev_filter_state_set(&dmxdev->filter[i],
1428 DMXDEV_STATE_FREE);
1429 }
1430
1431 ret = dvb_register_device(dvb_adapter, &dmxdev->dvbdev, &dvbdev_demux, dmxdev,
1432 DVB_DEVICE_DEMUX, dmxdev->filternum);
1433 if (ret < 0)
1434 goto err_register_dvbdev;
1435
1436 ret = dvb_register_device(dvb_adapter, &dmxdev->dvr_dvbdev, &dvbdev_dvr,
1437 dmxdev, DVB_DEVICE_DVR, dmxdev->filternum);
1438 if (ret < 0)
1439 goto err_register_dvr_dvbdev;
1440
1441 dvb_ringbuffer_init(&dmxdev->dvr_buffer, NULL, 8192);
1442
1443 return 0;
1444
1445 err_register_dvr_dvbdev:
1446 dvb_unregister_device(dmxdev->dvbdev);
1447 err_register_dvbdev:
1448 vfree(dmxdev->filter);
1449 dmxdev->filter = NULL;
1450 return ret;
1451 }
1452
1453 EXPORT_SYMBOL(dvb_dmxdev_init);
1454
dvb_dmxdev_release(struct dmxdev * dmxdev)1455 void dvb_dmxdev_release(struct dmxdev *dmxdev)
1456 {
1457 mutex_lock(&dmxdev->mutex);
1458 dmxdev->exit = 1;
1459 mutex_unlock(&dmxdev->mutex);
1460
1461 if (dmxdev->dvbdev->users > 1) {
1462 wait_event(dmxdev->dvbdev->wait_queue,
1463 dmxdev->dvbdev->users == 1);
1464 }
1465 if (dmxdev->dvr_dvbdev->users > 1) {
1466 wait_event(dmxdev->dvr_dvbdev->wait_queue,
1467 dmxdev->dvr_dvbdev->users == 1);
1468 }
1469
1470 dvb_unregister_device(dmxdev->dvbdev);
1471 dvb_unregister_device(dmxdev->dvr_dvbdev);
1472
1473 vfree(dmxdev->filter);
1474 dmxdev->filter = NULL;
1475 dmxdev->demux->close(dmxdev->demux);
1476 }
1477
1478 EXPORT_SYMBOL(dvb_dmxdev_release);
1479