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[ARM] Support register switch in nommu mode
[linux-2.6/verdex.git] / drivers / media / dvb / dvb-core / dvb_demux.c
blobb4c899b15959c62d016388926b00ea2f83624670
1 /*
2 * dvb_demux.c - DVB kernel demux API
3 *
4 * Copyright (C) 2000-2001 Ralph Metzler <ralph@convergence.de>
5 * & Marcus Metzler <marcus@convergence.de>
6 * for convergence integrated media GmbH
7 *
8 * This program is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU Lesser General Public License
10 * as published by the Free Software Foundation; either version 2.1
11 * of the License, or (at your option) any later version.
12 *
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
17 *
18 * You should have received a copy of the GNU Lesser General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
21 *
22 */
23
24 #include <linux/spinlock.h>
25 #include <linux/slab.h>
26 #include <linux/vmalloc.h>
27 #include <linux/module.h>
28 #include <linux/poll.h>
29 #include <linux/string.h>
30 #include <linux/crc32.h>
31 #include <asm/uaccess.h>
32
33 #include "dvb_demux.h"
34
35 #define NOBUFS
36 /*
37 ** #define DVB_DEMUX_SECTION_LOSS_LOG to monitor payload loss in the syslog
38 */
39 // #define DVB_DEMUX_SECTION_LOSS_LOG
40
41 /******************************************************************************
42 * static inlined helper functions
43 ******************************************************************************/
44
45 static inline u16 section_length(const u8 *buf)
46 {
47 return 3 + ((buf[1] & 0x0f) << 8) + buf[2];
48 }
49
50 static inline u16 ts_pid(const u8 *buf)
51 {
52 return ((buf[1] & 0x1f) << 8) + buf[2];
53 }
54
55 static inline u8 payload(const u8 *tsp)
56 {
57 if (!(tsp[3] & 0x10)) // no payload?
58 return 0;
59
60 if (tsp[3] & 0x20) { // adaptation field?
61 if (tsp[4] > 183) // corrupted data?
62 return 0;
63 else
64 return 184 - 1 - tsp[4];
65 }
66
67 return 184;
68 }
69
70 static u32 dvb_dmx_crc32(struct dvb_demux_feed *f, const u8 *src, size_t len)
71 {
72 return (f->feed.sec.crc_val = crc32_be(f->feed.sec.crc_val, src, len));
73 }
74
75 static void dvb_dmx_memcopy(struct dvb_demux_feed *f, u8 *d, const u8 *s,
76 size_t len)
77 {
78 memcpy(d, s, len);
79 }
80
81 /******************************************************************************
82 * Software filter functions
83 ******************************************************************************/
84
85 static inline int dvb_dmx_swfilter_payload(struct dvb_demux_feed *feed,
86 const u8 *buf)
87 {
88 int count = payload(buf);
89 int p;
90 //int ccok;
91 //u8 cc;
92
93 if (count == 0)
94 return -1;
95
96 p = 188 - count;
97
98 /*
99 cc = buf[3] & 0x0f;
100 ccok = ((feed->cc + 1) & 0x0f) == cc;
101 feed->cc = cc;
102 if (!ccok)
103 printk("missed packet!\n");
104 */
105
106 if (buf[1] & 0x40) // PUSI ?
107 feed->peslen = 0xfffa;
108
109 feed->peslen += count;
110
111 return feed->cb.ts(&buf[p], count, NULL, 0, &feed->feed.ts, DMX_OK);
112 }
113
114 static int dvb_dmx_swfilter_sectionfilter(struct dvb_demux_feed *feed,
115 struct dvb_demux_filter *f)
116 {
117 u8 neq = 0;
118 int i;
119
120 for (i = 0; i < DVB_DEMUX_MASK_MAX; i++) {
121 u8 xor = f->filter.filter_value[i] ^ feed->feed.sec.secbuf[i];
122
123 if (f->maskandmode[i] & xor)
124 return 0;
125
126 neq |= f->maskandnotmode[i] & xor;
127 }
128
129 if (f->doneq && !neq)
130 return 0;
131
132 return feed->cb.sec(feed->feed.sec.secbuf, feed->feed.sec.seclen,
133 NULL, 0, &f->filter, DMX_OK);
134 }
135
136 static inline int dvb_dmx_swfilter_section_feed(struct dvb_demux_feed *feed)
137 {
138 struct dvb_demux *demux = feed->demux;
139 struct dvb_demux_filter *f = feed->filter;
140 struct dmx_section_feed *sec = &feed->feed.sec;
141 int section_syntax_indicator;
142
143 if (!sec->is_filtering)
144 return 0;
145
146 if (!f)
147 return 0;
148
149 if (sec->check_crc) {
150 section_syntax_indicator = ((sec->secbuf[1] & 0x80) != 0);
151 if (section_syntax_indicator &&
152 demux->check_crc32(feed, sec->secbuf, sec->seclen))
153 return -1;
154 }
155
156 do {
157 if (dvb_dmx_swfilter_sectionfilter(feed, f) < 0)
158 return -1;
159 } while ((f = f->next) && sec->is_filtering);
160
161 sec->seclen = 0;
162
163 return 0;
164 }
165
166 static void dvb_dmx_swfilter_section_new(struct dvb_demux_feed *feed)
167 {
168 struct dmx_section_feed *sec = &feed->feed.sec;
169
170 #ifdef DVB_DEMUX_SECTION_LOSS_LOG
171 if (sec->secbufp < sec->tsfeedp) {
172 int i, n = sec->tsfeedp - sec->secbufp;
173
174 /*
175 * Section padding is done with 0xff bytes entirely.
176 * Due to speed reasons, we won't check all of them
177 * but just first and last.
178 */
179 if (sec->secbuf[0] != 0xff || sec->secbuf[n - 1] != 0xff) {
180 printk("dvb_demux.c section ts padding loss: %d/%d\n",
181 n, sec->tsfeedp);
182 printk("dvb_demux.c pad data:");
183 for (i = 0; i < n; i++)
184 printk(" %02x", sec->secbuf[i]);
185 printk("\n");
186 }
187 }
188 #endif
189
190 sec->tsfeedp = sec->secbufp = sec->seclen = 0;
191 sec->secbuf = sec->secbuf_base;
192 }
193
194 /*
195 * Losless Section Demux 1.4.1 by Emard
196 * Valsecchi Patrick:
197 * - middle of section A (no PUSI)
198 * - end of section A and start of section B
199 * (with PUSI pointing to the start of the second section)
200 *
201 * In this case, without feed->pusi_seen you'll receive a garbage section
202 * consisting of the end of section A. Basically because tsfeedp
203 * is incemented and the use=0 condition is not raised
204 * when the second packet arrives.
205 *
206 * Fix:
207 * when demux is started, let feed->pusi_seen = 0 to
208 * prevent initial feeding of garbage from the end of
209 * previous section. When you for the first time see PUSI=1
210 * then set feed->pusi_seen = 1
211 */
212 static int dvb_dmx_swfilter_section_copy_dump(struct dvb_demux_feed *feed,
213 const u8 *buf, u8 len)
214 {
215 struct dvb_demux *demux = feed->demux;
216 struct dmx_section_feed *sec = &feed->feed.sec;
217 u16 limit, seclen, n;
218
219 if (sec->tsfeedp >= DMX_MAX_SECFEED_SIZE)
220 return 0;
221
222 if (sec->tsfeedp + len > DMX_MAX_SECFEED_SIZE) {
223 #ifdef DVB_DEMUX_SECTION_LOSS_LOG
224 printk("dvb_demux.c section buffer full loss: %d/%d\n",
225 sec->tsfeedp + len - DMX_MAX_SECFEED_SIZE,
226 DMX_MAX_SECFEED_SIZE);
227 #endif
228 len = DMX_MAX_SECFEED_SIZE - sec->tsfeedp;
229 }
230
231 if (len <= 0)
232 return 0;
233
234 demux->memcopy(feed, sec->secbuf_base + sec->tsfeedp, buf, len);
235 sec->tsfeedp += len;
236
237 /*
238 * Dump all the sections we can find in the data (Emard)
239 */
240 limit = sec->tsfeedp;
241 if (limit > DMX_MAX_SECFEED_SIZE)
242 return -1; /* internal error should never happen */
243
244 /* to be sure always set secbuf */
245 sec->secbuf = sec->secbuf_base + sec->secbufp;
246
247 for (n = 0; sec->secbufp + 2 < limit; n++) {
248 seclen = section_length(sec->secbuf);
249 if (seclen <= 0 || seclen > DMX_MAX_SECTION_SIZE
250 || seclen + sec->secbufp > limit)
251 return 0;
252 sec->seclen = seclen;
253 sec->crc_val = ~0;
254 /* dump [secbuf .. secbuf+seclen) */
255 if (feed->pusi_seen)
256 dvb_dmx_swfilter_section_feed(feed);
257 #ifdef DVB_DEMUX_SECTION_LOSS_LOG
258 else
259 printk("dvb_demux.c pusi not seen, discarding section data\n");
260 #endif
261 sec->secbufp += seclen; /* secbufp and secbuf moving together is */
262 sec->secbuf += seclen; /* redundant but saves pointer arithmetic */
263 }
264
265 return 0;
266 }
267
268 static int dvb_dmx_swfilter_section_packet(struct dvb_demux_feed *feed,
269 const u8 *buf)
270 {
271 u8 p, count;
272 int ccok, dc_i = 0;
273 u8 cc;
274
275 count = payload(buf);
276
277 if (count == 0) /* count == 0 if no payload or out of range */
278 return -1;
279
280 p = 188 - count; /* payload start */
281
282 cc = buf[3] & 0x0f;
283 ccok = ((feed->cc + 1) & 0x0f) == cc;
284 feed->cc = cc;
285
286 if (buf[3] & 0x20) {
287 /* adaption field present, check for discontinuity_indicator */
288 if ((buf[4] > 0) && (buf[5] & 0x80))
289 dc_i = 1;
290 }
291
292 if (!ccok || dc_i) {
293 #ifdef DVB_DEMUX_SECTION_LOSS_LOG
294 printk("dvb_demux.c discontinuity detected %d bytes lost\n",
295 count);
296 /*
297 * those bytes under sume circumstances will again be reported
298 * in the following dvb_dmx_swfilter_section_new
299 */
300 #endif
301 /*
302 * Discontinuity detected. Reset pusi_seen = 0 to
303 * stop feeding of suspicious data until next PUSI=1 arrives
304 */
305 feed->pusi_seen = 0;
306 dvb_dmx_swfilter_section_new(feed);
307 }
308
309 if (buf[1] & 0x40) {
310 /* PUSI=1 (is set), section boundary is here */
311 if (count > 1 && buf[p] < count) {
312 const u8 *before = &buf[p + 1];
313 u8 before_len = buf[p];
314 const u8 *after = &before[before_len];
315 u8 after_len = count - 1 - before_len;
316
317 dvb_dmx_swfilter_section_copy_dump(feed, before,
318 before_len);
319 /* before start of new section, set pusi_seen = 1 */
320 feed->pusi_seen = 1;
321 dvb_dmx_swfilter_section_new(feed);
322 dvb_dmx_swfilter_section_copy_dump(feed, after,
323 after_len);
324 }
325 #ifdef DVB_DEMUX_SECTION_LOSS_LOG
326 else if (count > 0)
327 printk("dvb_demux.c PUSI=1 but %d bytes lost\n", count);
328 #endif
329 } else {
330 /* PUSI=0 (is not set), no section boundary */
331 dvb_dmx_swfilter_section_copy_dump(feed, &buf[p], count);
332 }
333
334 return 0;
335 }
336
337 static inline void dvb_dmx_swfilter_packet_type(struct dvb_demux_feed *feed,
338 const u8 *buf)
339 {
340 switch (feed->type) {
341 case DMX_TYPE_TS:
342 if (!feed->feed.ts.is_filtering)
343 break;
344 if (feed->ts_type & TS_PACKET) {
345 if (feed->ts_type & TS_PAYLOAD_ONLY)
346 dvb_dmx_swfilter_payload(feed, buf);
347 else
348 feed->cb.ts(buf, 188, NULL, 0, &feed->feed.ts,
349 DMX_OK);
350 }
351 if (feed->ts_type & TS_DECODER)
352 if (feed->demux->write_to_decoder)
353 feed->demux->write_to_decoder(feed, buf, 188);
354 break;
355
356 case DMX_TYPE_SEC:
357 if (!feed->feed.sec.is_filtering)
358 break;
359 if (dvb_dmx_swfilter_section_packet(feed, buf) < 0)
360 feed->feed.sec.seclen = feed->feed.sec.secbufp = 0;
361 break;
362
363 default:
364 break;
365 }
366 }
367
368 #define DVR_FEED(f) \
369 (((f)->type == DMX_TYPE_TS) && \
370 ((f)->feed.ts.is_filtering) && \
371 (((f)->ts_type & (TS_PACKET|TS_PAYLOAD_ONLY)) == TS_PACKET))
372
373 static void dvb_dmx_swfilter_packet(struct dvb_demux *demux, const u8 *buf)
374 {
375 struct dvb_demux_feed *feed;
376 struct list_head *pos, *head = &demux->feed_list;
377 u16 pid = ts_pid(buf);
378 int dvr_done = 0;
379
380 list_for_each(pos, head) {
381 feed = list_entry(pos, struct dvb_demux_feed, list_head);
382
383 if ((feed->pid != pid) && (feed->pid != 0x2000))
384 continue;
385
386 /* copy each packet only once to the dvr device, even
387 * if a PID is in multiple filters (e.g. video + PCR) */
388 if ((DVR_FEED(feed)) && (dvr_done++))
389 continue;
390
391 if (feed->pid == pid) {
392 dvb_dmx_swfilter_packet_type(feed, buf);
393 if (DVR_FEED(feed))
394 continue;
395 }
396
397 if (feed->pid == 0x2000)
398 feed->cb.ts(buf, 188, NULL, 0, &feed->feed.ts, DMX_OK);
399 }
400 }
401
402 void dvb_dmx_swfilter_packets(struct dvb_demux *demux, const u8 *buf,
403 size_t count)
404 {
405 spin_lock(&demux->lock);
406
407 while (count--) {
408 if (buf[0] == 0x47)
409 dvb_dmx_swfilter_packet(demux, buf);
410 buf += 188;
411 }
412
413 spin_unlock(&demux->lock);
414 }
415
416 EXPORT_SYMBOL(dvb_dmx_swfilter_packets);
417
418 void dvb_dmx_swfilter(struct dvb_demux *demux, const u8 *buf, size_t count)
419 {
420 int p = 0, i, j;
421
422 spin_lock(&demux->lock);
423
424 if (demux->tsbufp) {
425 i = demux->tsbufp;
426 j = 188 - i;
427 if (count < j) {
428 memcpy(&demux->tsbuf[i], buf, count);
429 demux->tsbufp += count;
430 goto bailout;
431 }
432 memcpy(&demux->tsbuf[i], buf, j);
433 if (demux->tsbuf[0] == 0x47)
434 dvb_dmx_swfilter_packet(demux, demux->tsbuf);
435 demux->tsbufp = 0;
436 p += j;
437 }
438
439 while (p < count) {
440 if (buf[p] == 0x47) {
441 if (count - p >= 188) {
442 dvb_dmx_swfilter_packet(demux, &buf[p]);
443 p += 188;
444 } else {
445 i = count - p;
446 memcpy(demux->tsbuf, &buf[p], i);
447 demux->tsbufp = i;
448 goto bailout;
449 }
450 } else
451 p++;
452 }
453
454 bailout:
455 spin_unlock(&demux->lock);
456 }
457
458 EXPORT_SYMBOL(dvb_dmx_swfilter);
459
460 void dvb_dmx_swfilter_204(struct dvb_demux *demux, const u8 *buf, size_t count)
461 {
462 int p = 0, i, j;
463 u8 tmppack[188];
464
465 spin_lock(&demux->lock);
466
467 if (demux->tsbufp) {
468 i = demux->tsbufp;
469 j = 204 - i;
470 if (count < j) {
471 memcpy(&demux->tsbuf[i], buf, count);
472 demux->tsbufp += count;
473 goto bailout;
474 }
475 memcpy(&demux->tsbuf[i], buf, j);
476 if ((demux->tsbuf[0] == 0x47) | (demux->tsbuf[0] == 0xB8)) {
477 memcpy(tmppack, demux->tsbuf, 188);
478 if (tmppack[0] == 0xB8)
479 tmppack[0] = 0x47;
480 dvb_dmx_swfilter_packet(demux, tmppack);
481 }
482 demux->tsbufp = 0;
483 p += j;
484 }
485
486 while (p < count) {
487 if ((buf[p] == 0x47) | (buf[p] == 0xB8)) {
488 if (count - p >= 204) {
489 memcpy(tmppack, &buf[p], 188);
490 if (tmppack[0] == 0xB8)
491 tmppack[0] = 0x47;
492 dvb_dmx_swfilter_packet(demux, tmppack);
493 p += 204;
494 } else {
495 i = count - p;
496 memcpy(demux->tsbuf, &buf[p], i);
497 demux->tsbufp = i;
498 goto bailout;
499 }
500 } else {
501 p++;
502 }
503 }
504
505 bailout:
506 spin_unlock(&demux->lock);
507 }
508
509 EXPORT_SYMBOL(dvb_dmx_swfilter_204);
510
511 static struct dvb_demux_filter *dvb_dmx_filter_alloc(struct dvb_demux *demux)
512 {
513 int i;
514
515 for (i = 0; i < demux->filternum; i++)
516 if (demux->filter[i].state == DMX_STATE_FREE)
517 break;
518
519 if (i == demux->filternum)
520 return NULL;
521
522 demux->filter[i].state = DMX_STATE_ALLOCATED;
523
524 return &demux->filter[i];
525 }
526
527 static struct dvb_demux_feed *dvb_dmx_feed_alloc(struct dvb_demux *demux)
528 {
529 int i;
530
531 for (i = 0; i < demux->feednum; i++)
532 if (demux->feed[i].state == DMX_STATE_FREE)
533 break;
534
535 if (i == demux->feednum)
536 return NULL;
537
538 demux->feed[i].state = DMX_STATE_ALLOCATED;
539
540 return &demux->feed[i];
541 }
542
543 static int dvb_demux_feed_find(struct dvb_demux_feed *feed)
544 {
545 struct dvb_demux_feed *entry;
546
547 list_for_each_entry(entry, &feed->demux->feed_list, list_head)
548 if (entry == feed)
549 return 1;
550
551 return 0;
552 }
553
554 static void dvb_demux_feed_add(struct dvb_demux_feed *feed)
555 {
556 spin_lock_irq(&feed->demux->lock);
557 if (dvb_demux_feed_find(feed)) {
558 printk(KERN_ERR "%s: feed already in list (type=%x state=%x pid=%x)\n",
559 __FUNCTION__, feed->type, feed->state, feed->pid);
560 goto out;
561 }
562
563 list_add(&feed->list_head, &feed->demux->feed_list);
564 out:
565 spin_unlock_irq(&feed->demux->lock);
566 }
567
568 static void dvb_demux_feed_del(struct dvb_demux_feed *feed)
569 {
570 spin_lock_irq(&feed->demux->lock);
571 if (!(dvb_demux_feed_find(feed))) {
572 printk(KERN_ERR "%s: feed not in list (type=%x state=%x pid=%x)\n",
573 __FUNCTION__, feed->type, feed->state, feed->pid);
574 goto out;
575 }
576
577 list_del(&feed->list_head);
578 out:
579 spin_unlock_irq(&feed->demux->lock);
580 }
581
582 static int dmx_ts_feed_set(struct dmx_ts_feed *ts_feed, u16 pid, int ts_type,
583 enum dmx_ts_pes pes_type,
584 size_t circular_buffer_size, struct timespec timeout)
585 {
586 struct dvb_demux_feed *feed = (struct dvb_demux_feed *)ts_feed;
587 struct dvb_demux *demux = feed->demux;
588
589 if (pid > DMX_MAX_PID)
590 return -EINVAL;
591
592 if (down_interruptible(&demux->mutex))
593 return -ERESTARTSYS;
594
595 if (ts_type & TS_DECODER) {
596 if (pes_type >= DMX_TS_PES_OTHER) {
597 up(&demux->mutex);
598 return -EINVAL;
599 }
600
601 if (demux->pesfilter[pes_type] &&
602 demux->pesfilter[pes_type] != feed) {
603 up(&demux->mutex);
604 return -EINVAL;
605 }
606
607 demux->pesfilter[pes_type] = feed;
608 demux->pids[pes_type] = pid;
609 }
610
611 dvb_demux_feed_add(feed);
612
613 feed->pid = pid;
614 feed->buffer_size = circular_buffer_size;
615 feed->timeout = timeout;
616 feed->ts_type = ts_type;
617 feed->pes_type = pes_type;
618
619 if (feed->buffer_size) {
620 #ifdef NOBUFS
621 feed->buffer = NULL;
622 #else
623 feed->buffer = vmalloc(feed->buffer_size);
624 if (!feed->buffer) {
625 up(&demux->mutex);
626 return -ENOMEM;
627 }
628 #endif
629 }
630
631 feed->state = DMX_STATE_READY;
632 up(&demux->mutex);
633
634 return 0;
635 }
636
637 static int dmx_ts_feed_start_filtering(struct dmx_ts_feed *ts_feed)
638 {
639 struct dvb_demux_feed *feed = (struct dvb_demux_feed *)ts_feed;
640 struct dvb_demux *demux = feed->demux;
641 int ret;
642
643 if (down_interruptible(&demux->mutex))
644 return -ERESTARTSYS;
645
646 if (feed->state != DMX_STATE_READY || feed->type != DMX_TYPE_TS) {
647 up(&demux->mutex);
648 return -EINVAL;
649 }
650
651 if (!demux->start_feed) {
652 up(&demux->mutex);
653 return -ENODEV;
654 }
655
656 if ((ret = demux->start_feed(feed)) < 0) {
657 up(&demux->mutex);
658 return ret;
659 }
660
661 spin_lock_irq(&demux->lock);
662 ts_feed->is_filtering = 1;
663 feed->state = DMX_STATE_GO;
664 spin_unlock_irq(&demux->lock);
665 up(&demux->mutex);
666
667 return 0;
668 }
669
670 static int dmx_ts_feed_stop_filtering(struct dmx_ts_feed *ts_feed)
671 {
672 struct dvb_demux_feed *feed = (struct dvb_demux_feed *)ts_feed;
673 struct dvb_demux *demux = feed->demux;
674 int ret;
675
676 if (down_interruptible(&demux->mutex))
677 return -ERESTARTSYS;
678
679 if (feed->state < DMX_STATE_GO) {
680 up(&demux->mutex);
681 return -EINVAL;
682 }
683
684 if (!demux->stop_feed) {
685 up(&demux->mutex);
686 return -ENODEV;
687 }
688
689 ret = demux->stop_feed(feed);
690
691 spin_lock_irq(&demux->lock);
692 ts_feed->is_filtering = 0;
693 feed->state = DMX_STATE_ALLOCATED;
694 spin_unlock_irq(&demux->lock);
695 up(&demux->mutex);
696
697 return ret;
698 }
699
700 static int dvbdmx_allocate_ts_feed(struct dmx_demux *dmx,
701 struct dmx_ts_feed **ts_feed,
702 dmx_ts_cb callback)
703 {
704 struct dvb_demux *demux = (struct dvb_demux *)dmx;
705 struct dvb_demux_feed *feed;
706
707 if (down_interruptible(&demux->mutex))
708 return -ERESTARTSYS;
709
710 if (!(feed = dvb_dmx_feed_alloc(demux))) {
711 up(&demux->mutex);
712 return -EBUSY;
713 }
714
715 feed->type = DMX_TYPE_TS;
716 feed->cb.ts = callback;
717 feed->demux = demux;
718 feed->pid = 0xffff;
719 feed->peslen = 0xfffa;
720 feed->buffer = NULL;
721
722 (*ts_feed) = &feed->feed.ts;
723 (*ts_feed)->parent = dmx;
724 (*ts_feed)->priv = NULL;
725 (*ts_feed)->is_filtering = 0;
726 (*ts_feed)->start_filtering = dmx_ts_feed_start_filtering;
727 (*ts_feed)->stop_filtering = dmx_ts_feed_stop_filtering;
728 (*ts_feed)->set = dmx_ts_feed_set;
729
730 if (!(feed->filter = dvb_dmx_filter_alloc(demux))) {
731 feed->state = DMX_STATE_FREE;
732 up(&demux->mutex);
733 return -EBUSY;
734 }
735
736 feed->filter->type = DMX_TYPE_TS;
737 feed->filter->feed = feed;
738 feed->filter->state = DMX_STATE_READY;
739
740 up(&demux->mutex);
741
742 return 0;
743 }
744
745 static int dvbdmx_release_ts_feed(struct dmx_demux *dmx,
746 struct dmx_ts_feed *ts_feed)
747 {
748 struct dvb_demux *demux = (struct dvb_demux *)dmx;
749 struct dvb_demux_feed *feed = (struct dvb_demux_feed *)ts_feed;
750
751 if (down_interruptible(&demux->mutex))
752 return -ERESTARTSYS;
753
754 if (feed->state == DMX_STATE_FREE) {
755 up(&demux->mutex);
756 return -EINVAL;
757 }
758 #ifndef NOBUFS
759 vfree(feed->buffer);
760 feed->buffer = NULL;
761 #endif
762
763 feed->state = DMX_STATE_FREE;
764 feed->filter->state = DMX_STATE_FREE;
765
766 dvb_demux_feed_del(feed);
767
768 feed->pid = 0xffff;
769
770 if (feed->ts_type & TS_DECODER && feed->pes_type < DMX_TS_PES_OTHER)
771 demux->pesfilter[feed->pes_type] = NULL;
772
773 up(&demux->mutex);
774 return 0;
775 }
776
777 /******************************************************************************
778 * dmx_section_feed API calls
779 ******************************************************************************/
780
781 static int dmx_section_feed_allocate_filter(struct dmx_section_feed *feed,
782 struct dmx_section_filter **filter)
783 {
784 struct dvb_demux_feed *dvbdmxfeed = (struct dvb_demux_feed *)feed;
785 struct dvb_demux *dvbdemux = dvbdmxfeed->demux;
786 struct dvb_demux_filter *dvbdmxfilter;
787
788 if (down_interruptible(&dvbdemux->mutex))
789 return -ERESTARTSYS;
790
791 dvbdmxfilter = dvb_dmx_filter_alloc(dvbdemux);
792 if (!dvbdmxfilter) {
793 up(&dvbdemux->mutex);
794 return -EBUSY;
795 }
796
797 spin_lock_irq(&dvbdemux->lock);
798 *filter = &dvbdmxfilter->filter;
799 (*filter)->parent = feed;
800 (*filter)->priv = NULL;
801 dvbdmxfilter->feed = dvbdmxfeed;
802 dvbdmxfilter->type = DMX_TYPE_SEC;
803 dvbdmxfilter->state = DMX_STATE_READY;
804 dvbdmxfilter->next = dvbdmxfeed->filter;
805 dvbdmxfeed->filter = dvbdmxfilter;
806 spin_unlock_irq(&dvbdemux->lock);
807
808 up(&dvbdemux->mutex);
809 return 0;
810 }
811
812 static int dmx_section_feed_set(struct dmx_section_feed *feed,
813 u16 pid, size_t circular_buffer_size,
814 int check_crc)
815 {
816 struct dvb_demux_feed *dvbdmxfeed = (struct dvb_demux_feed *)feed;
817 struct dvb_demux *dvbdmx = dvbdmxfeed->demux;
818
819 if (pid > 0x1fff)
820 return -EINVAL;
821
822 if (down_interruptible(&dvbdmx->mutex))
823 return -ERESTARTSYS;
824
825 dvb_demux_feed_add(dvbdmxfeed);
826
827 dvbdmxfeed->pid = pid;
828 dvbdmxfeed->buffer_size = circular_buffer_size;
829 dvbdmxfeed->feed.sec.check_crc = check_crc;
830
831 #ifdef NOBUFS
832 dvbdmxfeed->buffer = NULL;
833 #else
834 dvbdmxfeed->buffer = vmalloc(dvbdmxfeed->buffer_size);
835 if (!dvbdmxfeed->buffer) {
836 up(&dvbdmx->mutex);
837 return -ENOMEM;
838 }
839 #endif
840
841 dvbdmxfeed->state = DMX_STATE_READY;
842 up(&dvbdmx->mutex);
843 return 0;
844 }
845
846 static void prepare_secfilters(struct dvb_demux_feed *dvbdmxfeed)
847 {
848 int i;
849 struct dvb_demux_filter *f;
850 struct dmx_section_filter *sf;
851 u8 mask, mode, doneq;
852
853 if (!(f = dvbdmxfeed->filter))
854 return;
855 do {
856 sf = &f->filter;
857 doneq = 0;
858 for (i = 0; i < DVB_DEMUX_MASK_MAX; i++) {
859 mode = sf->filter_mode[i];
860 mask = sf->filter_mask[i];
861 f->maskandmode[i] = mask & mode;
862 doneq |= f->maskandnotmode[i] = mask & ~mode;
863 }
864 f->doneq = doneq ? 1 : 0;
865 } while ((f = f->next));
866 }
867
868 static int dmx_section_feed_start_filtering(struct dmx_section_feed *feed)
869 {
870 struct dvb_demux_feed *dvbdmxfeed = (struct dvb_demux_feed *)feed;
871 struct dvb_demux *dvbdmx = dvbdmxfeed->demux;
872 int ret;
873
874 if (down_interruptible(&dvbdmx->mutex))
875 return -ERESTARTSYS;
876
877 if (feed->is_filtering) {
878 up(&dvbdmx->mutex);
879 return -EBUSY;
880 }
881
882 if (!dvbdmxfeed->filter) {
883 up(&dvbdmx->mutex);
884 return -EINVAL;
885 }
886
887 dvbdmxfeed->feed.sec.tsfeedp = 0;
888 dvbdmxfeed->feed.sec.secbuf = dvbdmxfeed->feed.sec.secbuf_base;
889 dvbdmxfeed->feed.sec.secbufp = 0;
890 dvbdmxfeed->feed.sec.seclen = 0;
891
892 if (!dvbdmx->start_feed) {
893 up(&dvbdmx->mutex);
894 return -ENODEV;
895 }
896
897 prepare_secfilters(dvbdmxfeed);
898
899 if ((ret = dvbdmx->start_feed(dvbdmxfeed)) < 0) {
900 up(&dvbdmx->mutex);
901 return ret;
902 }
903
904 spin_lock_irq(&dvbdmx->lock);
905 feed->is_filtering = 1;
906 dvbdmxfeed->state = DMX_STATE_GO;
907 spin_unlock_irq(&dvbdmx->lock);
908
909 up(&dvbdmx->mutex);
910 return 0;
911 }
912
913 static int dmx_section_feed_stop_filtering(struct dmx_section_feed *feed)
914 {
915 struct dvb_demux_feed *dvbdmxfeed = (struct dvb_demux_feed *)feed;
916 struct dvb_demux *dvbdmx = dvbdmxfeed->demux;
917 int ret;
918
919 if (down_interruptible(&dvbdmx->mutex))
920 return -ERESTARTSYS;
921
922 if (!dvbdmx->stop_feed) {
923 up(&dvbdmx->mutex);
924 return -ENODEV;
925 }
926
927 ret = dvbdmx->stop_feed(dvbdmxfeed);
928
929 spin_lock_irq(&dvbdmx->lock);
930 dvbdmxfeed->state = DMX_STATE_READY;
931 feed->is_filtering = 0;
932 spin_unlock_irq(&dvbdmx->lock);
933
934 up(&dvbdmx->mutex);
935 return ret;
936 }
937
938 static int dmx_section_feed_release_filter(struct dmx_section_feed *feed,
939 struct dmx_section_filter *filter)
940 {
941 struct dvb_demux_filter *dvbdmxfilter = (struct dvb_demux_filter *)filter, *f;
942 struct dvb_demux_feed *dvbdmxfeed = (struct dvb_demux_feed *)feed;
943 struct dvb_demux *dvbdmx = dvbdmxfeed->demux;
944
945 if (down_interruptible(&dvbdmx->mutex))
946 return -ERESTARTSYS;
947
948 if (dvbdmxfilter->feed != dvbdmxfeed) {
949 up(&dvbdmx->mutex);
950 return -EINVAL;
951 }
952
953 if (feed->is_filtering)
954 feed->stop_filtering(feed);
955
956 spin_lock_irq(&dvbdmx->lock);
957 f = dvbdmxfeed->filter;
958
959 if (f == dvbdmxfilter) {
960 dvbdmxfeed->filter = dvbdmxfilter->next;
961 } else {
962 while (f->next != dvbdmxfilter)
963 f = f->next;
964 f->next = f->next->next;
965 }
966
967 dvbdmxfilter->state = DMX_STATE_FREE;
968 spin_unlock_irq(&dvbdmx->lock);
969 up(&dvbdmx->mutex);
970 return 0;
971 }
972
973 static int dvbdmx_allocate_section_feed(struct dmx_demux *demux,
974 struct dmx_section_feed **feed,
975 dmx_section_cb callback)
976 {
977 struct dvb_demux *dvbdmx = (struct dvb_demux *)demux;
978 struct dvb_demux_feed *dvbdmxfeed;
979
980 if (down_interruptible(&dvbdmx->mutex))
981 return -ERESTARTSYS;
982
983 if (!(dvbdmxfeed = dvb_dmx_feed_alloc(dvbdmx))) {
984 up(&dvbdmx->mutex);
985 return -EBUSY;
986 }
987
988 dvbdmxfeed->type = DMX_TYPE_SEC;
989 dvbdmxfeed->cb.sec = callback;
990 dvbdmxfeed->demux = dvbdmx;
991 dvbdmxfeed->pid = 0xffff;
992 dvbdmxfeed->feed.sec.secbuf = dvbdmxfeed->feed.sec.secbuf_base;
993 dvbdmxfeed->feed.sec.secbufp = dvbdmxfeed->feed.sec.seclen = 0;
994 dvbdmxfeed->feed.sec.tsfeedp = 0;
995 dvbdmxfeed->filter = NULL;
996 dvbdmxfeed->buffer = NULL;
997
998 (*feed) = &dvbdmxfeed->feed.sec;
999 (*feed)->is_filtering = 0;
1000 (*feed)->parent = demux;
1001 (*feed)->priv = NULL;
1002
1003 (*feed)->set = dmx_section_feed_set;
1004 (*feed)->allocate_filter = dmx_section_feed_allocate_filter;
1005 (*feed)->start_filtering = dmx_section_feed_start_filtering;
1006 (*feed)->stop_filtering = dmx_section_feed_stop_filtering;
1007 (*feed)->release_filter = dmx_section_feed_release_filter;
1008
1009 up(&dvbdmx->mutex);
1010 return 0;
1011 }
1012
1013 static int dvbdmx_release_section_feed(struct dmx_demux *demux,
1014 struct dmx_section_feed *feed)
1015 {
1016 struct dvb_demux_feed *dvbdmxfeed = (struct dvb_demux_feed *)feed;
1017 struct dvb_demux *dvbdmx = (struct dvb_demux *)demux;
1018
1019 if (down_interruptible(&dvbdmx->mutex))
1020 return -ERESTARTSYS;
1021
1022 if (dvbdmxfeed->state == DMX_STATE_FREE) {
1023 up(&dvbdmx->mutex);
1024 return -EINVAL;
1025 }
1026 #ifndef NOBUFS
1027 vfree(dvbdmxfeed->buffer);
1028 dvbdmxfeed->buffer = NULL;
1029 #endif
1030 dvbdmxfeed->state = DMX_STATE_FREE;
1031
1032 dvb_demux_feed_del(dvbdmxfeed);
1033
1034 dvbdmxfeed->pid = 0xffff;
1035
1036 up(&dvbdmx->mutex);
1037 return 0;
1038 }
1039
1040 /******************************************************************************
1041 * dvb_demux kernel data API calls
1042 ******************************************************************************/
1043
1044 static int dvbdmx_open(struct dmx_demux *demux)
1045 {
1046 struct dvb_demux *dvbdemux = (struct dvb_demux *)demux;
1047
1048 if (dvbdemux->users >= MAX_DVB_DEMUX_USERS)
1049 return -EUSERS;
1050
1051 dvbdemux->users++;
1052 return 0;
1053 }
1054
1055 static int dvbdmx_close(struct dmx_demux *demux)
1056 {
1057 struct dvb_demux *dvbdemux = (struct dvb_demux *)demux;
1058
1059 if (dvbdemux->users == 0)
1060 return -ENODEV;
1061
1062 dvbdemux->users--;
1063 //FIXME: release any unneeded resources if users==0
1064 return 0;
1065 }
1066
1067 static int dvbdmx_write(struct dmx_demux *demux, const char *buf, size_t count)
1068 {
1069 struct dvb_demux *dvbdemux = (struct dvb_demux *)demux;
1070
1071 if ((!demux->frontend) || (demux->frontend->source != DMX_MEMORY_FE))
1072 return -EINVAL;
1073
1074 if (down_interruptible(&dvbdemux->mutex))
1075 return -ERESTARTSYS;
1076 dvb_dmx_swfilter(dvbdemux, buf, count);
1077 up(&dvbdemux->mutex);
1078
1079 if (signal_pending(current))
1080 return -EINTR;
1081 return count;
1082 }
1083
1084 static int dvbdmx_add_frontend(struct dmx_demux *demux,
1085 struct dmx_frontend *frontend)
1086 {
1087 struct dvb_demux *dvbdemux = (struct dvb_demux *)demux;
1088 struct list_head *head = &dvbdemux->frontend_list;
1089
1090 list_add(&(frontend->connectivity_list), head);
1091
1092 return 0;
1093 }
1094
1095 static int dvbdmx_remove_frontend(struct dmx_demux *demux,
1096 struct dmx_frontend *frontend)
1097 {
1098 struct dvb_demux *dvbdemux = (struct dvb_demux *)demux;
1099 struct list_head *pos, *n, *head = &dvbdemux->frontend_list;
1100
1101 list_for_each_safe(pos, n, head) {
1102 if (DMX_FE_ENTRY(pos) == frontend) {
1103 list_del(pos);
1104 return 0;
1105 }
1106 }
1107
1108 return -ENODEV;
1109 }
1110
1111 static struct list_head *dvbdmx_get_frontends(struct dmx_demux *demux)
1112 {
1113 struct dvb_demux *dvbdemux = (struct dvb_demux *)demux;
1114
1115 if (list_empty(&dvbdemux->frontend_list))
1116 return NULL;
1117
1118 return &dvbdemux->frontend_list;
1119 }
1120
1121 static int dvbdmx_connect_frontend(struct dmx_demux *demux,
1122 struct dmx_frontend *frontend)
1123 {
1124 struct dvb_demux *dvbdemux = (struct dvb_demux *)demux;
1125
1126 if (demux->frontend)
1127 return -EINVAL;
1128
1129 if (down_interruptible(&dvbdemux->mutex))
1130 return -ERESTARTSYS;
1131
1132 demux->frontend = frontend;
1133 up(&dvbdemux->mutex);
1134 return 0;
1135 }
1136
1137 static int dvbdmx_disconnect_frontend(struct dmx_demux *demux)
1138 {
1139 struct dvb_demux *dvbdemux = (struct dvb_demux *)demux;
1140
1141 if (down_interruptible(&dvbdemux->mutex))
1142 return -ERESTARTSYS;
1143
1144 demux->frontend = NULL;
1145 up(&dvbdemux->mutex);
1146 return 0;
1147 }
1148
1149 static int dvbdmx_get_pes_pids(struct dmx_demux *demux, u16 * pids)
1150 {
1151 struct dvb_demux *dvbdemux = (struct dvb_demux *)demux;
1152
1153 memcpy(pids, dvbdemux->pids, 5 * sizeof(u16));
1154 return 0;
1155 }
1156
1157 int dvb_dmx_init(struct dvb_demux *dvbdemux)
1158 {
1159 int i;
1160 struct dmx_demux *dmx = &dvbdemux->dmx;
1161
1162 dvbdemux->users = 0;
1163 dvbdemux->filter = vmalloc(dvbdemux->filternum * sizeof(struct dvb_demux_filter));
1164
1165 if (!dvbdemux->filter)
1166 return -ENOMEM;
1167
1168 dvbdemux->feed = vmalloc(dvbdemux->feednum * sizeof(struct dvb_demux_feed));
1169 if (!dvbdemux->feed) {
1170 vfree(dvbdemux->filter);
1171 return -ENOMEM;
1172 }
1173 for (i = 0; i < dvbdemux->filternum; i++) {
1174 dvbdemux->filter[i].state = DMX_STATE_FREE;
1175 dvbdemux->filter[i].index = i;
1176 }
1177 for (i = 0; i < dvbdemux->feednum; i++) {
1178 dvbdemux->feed[i].state = DMX_STATE_FREE;
1179 dvbdemux->feed[i].index = i;
1180 }
1181
1182 INIT_LIST_HEAD(&dvbdemux->frontend_list);
1183
1184 for (i = 0; i < DMX_TS_PES_OTHER; i++) {
1185 dvbdemux->pesfilter[i] = NULL;
1186 dvbdemux->pids[i] = 0xffff;
1187 }
1188
1189 INIT_LIST_HEAD(&dvbdemux->feed_list);
1190
1191 dvbdemux->playing = 0;
1192 dvbdemux->recording = 0;
1193 dvbdemux->tsbufp = 0;
1194
1195 if (!dvbdemux->check_crc32)
1196 dvbdemux->check_crc32 = dvb_dmx_crc32;
1197
1198 if (!dvbdemux->memcopy)
1199 dvbdemux->memcopy = dvb_dmx_memcopy;
1200
1201 dmx->frontend = NULL;
1202 dmx->priv = dvbdemux;
1203 dmx->open = dvbdmx_open;
1204 dmx->close = dvbdmx_close;
1205 dmx->write = dvbdmx_write;
1206 dmx->allocate_ts_feed = dvbdmx_allocate_ts_feed;
1207 dmx->release_ts_feed = dvbdmx_release_ts_feed;
1208 dmx->allocate_section_feed = dvbdmx_allocate_section_feed;
1209 dmx->release_section_feed = dvbdmx_release_section_feed;
1210
1211 dmx->add_frontend = dvbdmx_add_frontend;
1212 dmx->remove_frontend = dvbdmx_remove_frontend;
1213 dmx->get_frontends = dvbdmx_get_frontends;
1214 dmx->connect_frontend = dvbdmx_connect_frontend;
1215 dmx->disconnect_frontend = dvbdmx_disconnect_frontend;
1216 dmx->get_pes_pids = dvbdmx_get_pes_pids;
1217
1218 sema_init(&dvbdemux->mutex, 1);
1219 spin_lock_init(&dvbdemux->lock);
1220
1221 return 0;
1222 }
1223
1224 EXPORT_SYMBOL(dvb_dmx_init);
1225
1226 void dvb_dmx_release(struct dvb_demux *dvbdemux)
1227 {
1228 vfree(dvbdemux->filter);
1229 vfree(dvbdemux->feed);
1230 }
1231
1232 EXPORT_SYMBOL(dvb_dmx_release);
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