aboutsummaryrefslogtreecommitdiff
path: root/drivers/media/video/ivtv/ivtv-fileops.c
blob: 5dd519caf81d5dcbe52f788d65c4e337c719ac08 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
/*
    file operation functions
    Copyright (C) 2003-2004  Kevin Thayer <nufan_wfk at yahoo.com>
    Copyright (C) 2004  Chris Kennedy <c@groovy.org>
    Copyright (C) 2005-2007  Hans Verkuil <hverkuil@xs4all.nl>

    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation; either version 2 of the License, or
    (at your option) any later version.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with this program; if not, write to the Free Software
    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

#include "ivtv-driver.h"
#include "ivtv-fileops.h"
#include "ivtv-i2c.h"
#include "ivtv-queue.h"
#include "ivtv-udma.h"
#include "ivtv-irq.h"
#include "ivtv-vbi.h"
#include "ivtv-mailbox.h"
#include "ivtv-audio.h"
#include "ivtv-streams.h"
#include "ivtv-yuv.h"
#include "ivtv-controls.h"
#include "ivtv-ioctl.h"
#include "ivtv-cards.h"
#include <media/saa7115.h>

/* This function tries to claim the stream for a specific file descriptor.
   If no one else is using this stream then the stream is claimed and
   associated VBI streams are also automatically claimed.
   Possible error returns: -EBUSY if someone else has claimed
   the stream or 0 on success. */
int ivtv_claim_stream(struct ivtv_open_id *id, int type)
{
	struct ivtv *itv = id->itv;
	struct ivtv_stream *s = &itv->streams[type];
	struct ivtv_stream *s_vbi;
	int vbi_type;

	if (test_and_set_bit(IVTV_F_S_CLAIMED, &s->s_flags)) {
		/* someone already claimed this stream */
		if (s->id == id->open_id) {
			/* yes, this file descriptor did. So that's OK. */
			return 0;
		}
		if (s->id == -1 && (type == IVTV_DEC_STREAM_TYPE_VBI ||
					 type == IVTV_ENC_STREAM_TYPE_VBI)) {
			/* VBI is handled already internally, now also assign
			   the file descriptor to this stream for external
			   reading of the stream. */
			s->id = id->open_id;
			IVTV_DEBUG_INFO("Start Read VBI\n");
			return 0;
		}
		/* someone else is using this stream already */
		IVTV_DEBUG_INFO("Stream %d is busy\n", type);
		return -EBUSY;
	}
	s->id = id->open_id;
	if (type == IVTV_DEC_STREAM_TYPE_VBI) {
		/* Enable reinsertion interrupt */
		ivtv_clear_irq_mask(itv, IVTV_IRQ_DEC_VBI_RE_INSERT);
	}

	/* IVTV_DEC_STREAM_TYPE_MPG needs to claim IVTV_DEC_STREAM_TYPE_VBI,
	   IVTV_ENC_STREAM_TYPE_MPG needs to claim IVTV_ENC_STREAM_TYPE_VBI
	   (provided VBI insertion is on and sliced VBI is selected), for all
	   other streams we're done */
	if (type == IVTV_DEC_STREAM_TYPE_MPG) {
		vbi_type = IVTV_DEC_STREAM_TYPE_VBI;
	} else if (type == IVTV_ENC_STREAM_TYPE_MPG &&
		   itv->vbi.insert_mpeg && itv->vbi.sliced_in->service_set) {
		vbi_type = IVTV_ENC_STREAM_TYPE_VBI;
	} else {
		return 0;
	}
	s_vbi = &itv->streams[vbi_type];

	if (!test_and_set_bit(IVTV_F_S_CLAIMED, &s_vbi->s_flags)) {
		/* Enable reinsertion interrupt */
		if (vbi_type == IVTV_DEC_STREAM_TYPE_VBI)
			ivtv_clear_irq_mask(itv, IVTV_IRQ_DEC_VBI_RE_INSERT);
	}
	/* mark that it is used internally */
	set_bit(IVTV_F_S_INTERNAL_USE, &s_vbi->s_flags);
	return 0;
}

/* This function releases a previously claimed stream. It will take into
   account associated VBI streams. */
void ivtv_release_stream(struct ivtv_stream *s)
{
	struct ivtv *itv = s->itv;
	struct ivtv_stream *s_vbi;

	s->id = -1;
	if ((s->type == IVTV_DEC_STREAM_TYPE_VBI || s->type == IVTV_ENC_STREAM_TYPE_VBI) &&
		test_bit(IVTV_F_S_INTERNAL_USE, &s->s_flags)) {
		/* this stream is still in use internally */
		return;
	}
	if (!test_and_clear_bit(IVTV_F_S_CLAIMED, &s->s_flags)) {
		IVTV_DEBUG_WARN("Release stream %s not in use!\n", s->name);
		return;
	}

	ivtv_flush_queues(s);

	/* disable reinsertion interrupt */
	if (s->type == IVTV_DEC_STREAM_TYPE_VBI)
		ivtv_set_irq_mask(itv, IVTV_IRQ_DEC_VBI_RE_INSERT);

	/* IVTV_DEC_STREAM_TYPE_MPG needs to release IVTV_DEC_STREAM_TYPE_VBI,
	   IVTV_ENC_STREAM_TYPE_MPG needs to release IVTV_ENC_STREAM_TYPE_VBI,
	   for all other streams we're done */
	if (s->type == IVTV_DEC_STREAM_TYPE_MPG)
		s_vbi = &itv->streams[IVTV_DEC_STREAM_TYPE_VBI];
	else if (s->type == IVTV_ENC_STREAM_TYPE_MPG)
		s_vbi = &itv->streams[IVTV_ENC_STREAM_TYPE_VBI];
	else
		return;

	/* clear internal use flag */
	if (!test_and_clear_bit(IVTV_F_S_INTERNAL_USE, &s_vbi->s_flags)) {
		/* was already cleared */
		return;
	}
	if (s_vbi->id != -1) {
		/* VBI stream still claimed by a file descriptor */
		return;
	}
	/* disable reinsertion interrupt */
	if (s_vbi->type == IVTV_DEC_STREAM_TYPE_VBI)
		ivtv_set_irq_mask(itv, IVTV_IRQ_DEC_VBI_RE_INSERT);
	clear_bit(IVTV_F_S_CLAIMED, &s_vbi->s_flags);
	ivtv_flush_queues(s_vbi);
}

static void ivtv_dualwatch(struct ivtv *itv)
{
	struct v4l2_tuner vt;
	u16 new_bitmap;
	u16 new_stereo_mode;
	const u16 stereo_mask = 0x0300;
	const u16 dual = 0x0200;

	new_stereo_mode = itv->params.audio_properties & stereo_mask;
	memset(&vt, 0, sizeof(vt));
	ivtv_call_i2c_clients(itv, VIDIOC_G_TUNER, &vt);
	if (vt.audmode == V4L2_TUNER_MODE_LANG1_LANG2 && (vt.rxsubchans & V4L2_TUNER_SUB_LANG2))
		new_stereo_mode = dual;

	if (new_stereo_mode == itv->dualwatch_stereo_mode)
		return;

	new_bitmap = new_stereo_mode | (itv->params.audio_properties & ~stereo_mask);

	IVTV_DEBUG_INFO("dualwatch: change stereo flag from 0x%x to 0x%x. new audio_bitmask=0x%ux\n",
			   itv->dualwatch_stereo_mode, new_stereo_mode, new_bitmap);

	if (ivtv_vapi(itv, CX2341X_ENC_SET_AUDIO_PROPERTIES, 1, new_bitmap) == 0) {
		itv->dualwatch_stereo_mode = new_stereo_mode;
		return;
	}
	IVTV_DEBUG_INFO("dualwatch: changing stereo flag failed\n");
}

static void ivtv_update_pgm_info(struct ivtv *itv)
{
	u32 wr_idx = (read_enc(itv->pgm_info_offset) - itv->pgm_info_offset - 4) / 24;
	int cnt;
	int i = 0;

	if (wr_idx >= itv->pgm_info_num) {
		IVTV_DEBUG_WARN("Invalid PGM index %d (>= %d)\n", wr_idx, itv->pgm_info_num);
		return;
	}
	cnt = (wr_idx + itv->pgm_info_num - itv->pgm_info_write_idx) % itv->pgm_info_num;
	while (i < cnt) {
		int idx = (itv->pgm_info_write_idx + i) % itv->pgm_info_num;
		struct v4l2_enc_idx_entry *e = itv->pgm_info + idx;
		u32 addr = itv->pgm_info_offset + 4 + idx * 24;
		const int mapping[] = { V4L2_ENC_IDX_FRAME_P, V4L2_ENC_IDX_FRAME_I, V4L2_ENC_IDX_FRAME_B, 0 };

		e->offset = read_enc(addr + 4) + ((u64)read_enc(addr + 8) << 32);
		if (e->offset > itv->mpg_data_received) {
			break;
		}
		e->offset += itv->vbi_data_inserted;
		e->length = read_enc(addr);
		e->pts = read_enc(addr + 16) + ((u64)(read_enc(addr + 20) & 1) << 32);
		e->flags = mapping[read_enc(addr + 12) & 3];
		i++;
	}
	itv->pgm_info_write_idx = (itv->pgm_info_write_idx + i) % itv->pgm_info_num;
}

static struct ivtv_buffer *ivtv_get_buffer(struct ivtv_stream *s, int non_block, int *err)
{
	struct ivtv *itv = s->itv;
	struct ivtv_stream *s_vbi = &itv->streams[IVTV_ENC_STREAM_TYPE_VBI];
	struct ivtv_buffer *buf;
	DEFINE_WAIT(wait);

	*err = 0;
	while (1) {
		if (s->type == IVTV_ENC_STREAM_TYPE_MPG) {
			/* Process pending program info updates and pending VBI data */
			ivtv_update_pgm_info(itv);

			if (jiffies - itv->dualwatch_jiffies > msecs_to_jiffies(1000)) {
				itv->dualwatch_jiffies = jiffies;
				ivtv_dualwatch(itv);
			}

			if (test_bit(IVTV_F_S_INTERNAL_USE, &s_vbi->s_flags) &&
			    !test_bit(IVTV_F_S_APPL_IO, &s_vbi->s_flags)) {
				while ((buf = ivtv_dequeue(s_vbi, &s_vbi->q_full))) {
					/* byteswap and process VBI data */
					ivtv_process_vbi_data(itv, buf, s_vbi->dma_pts, s_vbi->type);
					ivtv_enqueue(s_vbi, buf, &s_vbi->q_free);
				}
			}
			buf = &itv->vbi.sliced_mpeg_buf;
			if (buf->readpos != buf->bytesused) {
				return buf;
			}
		}

		/* do we have leftover data? */
		buf = ivtv_dequeue(s, &s->q_io);
		if (buf)
			return buf;

		/* do we have new data? */
		buf = ivtv_dequeue(s, &s->q_full);
		if (buf) {
			if (!test_and_clear_bit(IVTV_F_B_NEED_BUF_SWAP, &buf->b_flags))
				return buf;
			if (s->type == IVTV_ENC_STREAM_TYPE_MPG)
				/* byteswap MPG data */
				ivtv_buf_swap(buf);
			else if (s->type != IVTV_DEC_STREAM_TYPE_VBI) {
				/* byteswap and process VBI data */
				ivtv_process_vbi_data(itv, buf, s->dma_pts, s->type);
			}
			return buf;
		}
		/* return if file was opened with O_NONBLOCK */
		if (non_block) {
			*err = -EAGAIN;
			return NULL;
		}

		/* return if end of stream */
		if (s->type != IVTV_DEC_STREAM_TYPE_VBI && !test_bit(IVTV_F_S_STREAMING, &s->s_flags)) {
			clear_bit(IVTV_F_S_STREAMOFF, &s->s_flags);
			IVTV_DEBUG_INFO("EOS %s\n", s->name);
			return NULL;
		}

		/* wait for more data to arrive */
		prepare_to_wait(&s->waitq, &wait, TASK_INTERRUPTIBLE);
		/* New buffers might have become available before we were added to the waitqueue */
		if (!s->q_full.buffers)
			schedule();
		finish_wait(&s->waitq, &wait);
		if (signal_pending(current)) {
			/* return if a signal was received */
			IVTV_DEBUG_INFO("User stopped %s\n", s->name);
			*err = -EINTR;
			return NULL;
		}
	}
}

static void ivtv_setup_sliced_vbi_buf(struct ivtv *itv)
{
	int idx = itv->vbi.inserted_frame % IVTV_VBI_FRAMES;

	itv->vbi.sliced_mpeg_buf.buf = itv->vbi.sliced_mpeg_data[idx];
	itv->vbi.sliced_mpeg_buf.bytesused = itv->vbi.sliced_mpeg_size[idx];
	itv->vbi.sliced_mpeg_buf.readpos = 0;
}

static size_t ivtv_copy_buf_to_user(struct ivtv_stream *s, struct ivtv_buffer *buf,
		char __user *ubuf, size_t ucount)
{
	struct ivtv *itv = s->itv;
	size_t len = buf->bytesused - buf->readpos;

	if (len > ucount) len = ucount;
	if (itv->vbi.insert_mpeg && s->type == IVTV_ENC_STREAM_TYPE_MPG &&
	    itv->vbi.sliced_in->service_set && buf != &itv->vbi.sliced_mpeg_buf) {
		const char *start = buf->buf + buf->readpos;
		const char *p = start + 1;
		const u8 *q;
		u8 ch = itv->search_pack_header ? 0xba : 0xe0;
		int stuffing, i;

		while (start + len > p && (q = memchr(p, 0, start + len - p))) {
			p = q + 1;
			if ((char *)q + 15 >= buf->buf + buf->bytesused ||
			    q[1] != 0 || q[2] != 1 || q[3] != ch) {
				continue;
			}
			if (!itv->search_pack_header) {
				if ((q[6] & 0xc0) != 0x80)
					continue;
				if (((q[7] & 0xc0) == 0x80 && (q[9] & 0xf0) == 0x20) ||
				    ((q[7] & 0xc0) == 0xc0 && (q[9] & 0xf0) == 0x30)) {
					ch = 0xba;
					itv->search_pack_header = 1;
					p = q + 9;
				}
				continue;
			}
			stuffing = q[13] & 7;
			/* all stuffing bytes must be 0xff */
			for (i = 0; i < stuffing; i++)
				if (q[14 + i] != 0xff)
					break;
			if (i == stuffing && (q[4] & 0xc4) == 0x44 && (q[12] & 3) == 3 &&
					q[14 + stuffing] == 0 && q[15 + stuffing] == 0 &&
					q[16 + stuffing] == 1) {
				itv->search_pack_header = 0;
				len = (char *)q - start;
				ivtv_setup_sliced_vbi_buf(itv);
				break;
			}
		}
	}
	if (copy_to_user(ubuf, (u8 *)buf->buf + buf->readpos, len)) {
		IVTV_DEBUG_WARN("copy %zd bytes to user failed for %s\n", len, s->name);
		return -EFAULT;
	}
	/*IVTV_INFO("copied %lld %d %d %d %d %d vbi %d\n", itv->mpg_data_received, len, ucount,
			buf->readpos, buf->bytesused, buf->bytesused - buf->readpos - len,
			buf == &itv->vbi.sliced_mpeg_buf); */
	buf->readpos += len;
	if (s->type == IVTV_ENC_STREAM_TYPE_MPG && buf != &itv->vbi.sliced_mpeg_buf)
		itv->mpg_data_received += len;
	return len;
}

static ssize_t ivtv_read(struct ivtv_stream *s, char __user *ubuf, size_t tot_count, int non_block)
{
	struct ivtv *itv = s->itv;
	size_t tot_written = 0;
	int single_frame = 0;

	if (atomic_read(&itv->capturing) == 0 && s->id == -1) {
		/* shouldn't happen */
		IVTV_DEBUG_WARN("Stream %s not initialized before read\n", s->name);
		return -EIO;
	}

	/* Each VBI buffer is one frame, the v4l2 API says that for VBI the frames should
	   arrive one-by-one, so make sure we never output more than one VBI frame at a time */
	if (s->type == IVTV_DEC_STREAM_TYPE_VBI ||
			(s->type == IVTV_ENC_STREAM_TYPE_VBI && itv->vbi.sliced_in->service_set))
		single_frame = 1;

	for (;;) {
		struct ivtv_buffer *buf;
		int rc;

		buf = ivtv_get_buffer(s, non_block, &rc);
		if (buf == NULL && rc == -EAGAIN && tot_written)
			break;
		if (buf == NULL)
			return rc;
		rc = ivtv_copy_buf_to_user(s, buf, ubuf + tot_written, tot_count - tot_written);
		if (buf != &itv->vbi.sliced_mpeg_buf) {
			ivtv_enqueue(s, buf, (buf->readpos == buf->bytesused) ? &s->q_free : &s->q_io);
		}
		else if (buf->readpos == buf->bytesused) {
			int idx = itv->vbi.inserted_frame % IVTV_VBI_FRAMES;
			itv->vbi.sliced_mpeg_size[idx] = 0;
			itv->vbi.inserted_frame++;
			itv->vbi_data_inserted += buf->bytesused;
		}
		if (rc < 0)
			return rc;
		tot_written += rc;

		if (tot_written == tot_count || single_frame)
			break;
	}
	return tot_written;
}

static ssize_t ivtv_read_pos(struct ivtv_stream *s, char __user *ubuf, size_t count,
			loff_t *pos, int non_block)
{
	ssize_t rc = count ? ivtv_read(s, ubuf, count, non_block) : 0;
	struct ivtv *itv = s->itv;

	IVTV_DEBUG_HI_INFO("read %zd from %s, got %zd\n", count, s->name, rc);
	if (rc > 0)
		pos += rc;
	return rc;
}

int ivtv_start_capture(struct ivtv_open_id *id)
{
	struct ivtv *itv = id->itv;
	struct ivtv_stream *s = &itv->streams[id->type];
	struct ivtv_stream *s_vbi;

	if (s->type == IVTV_ENC_STREAM_TYPE_RAD ||
	    s->type == IVTV_DEC_STREAM_TYPE_MPG ||
	    s->type == IVTV_DEC_STREAM_TYPE_YUV ||
	    s->type == IVTV_DEC_STREAM_TYPE_VOUT) {
		/* you cannot read from these stream types. */
		return -EPERM;
	}

	/* Try to claim this stream. */
	if (ivtv_claim_stream(id, s->type))
		return -EBUSY;

	/* This stream does not need to start capturing */
	if (s->type == IVTV_DEC_STREAM_TYPE_VBI) {
		set_bit(IVTV_F_S_APPL_IO, &s->s_flags);
		return 0;
	}

	/* If capture is already in progress, then we also have to
	   do nothing extra. */
	if (test_bit(IVTV_F_S_STREAMOFF, &s->s_flags) || test_and_set_bit(IVTV_F_S_STREAMING, &s->s_flags)) {
		set_bit(IVTV_F_S_APPL_IO, &s->s_flags);
		return 0;
	}

	/* Start VBI capture if required */
	s_vbi = &itv->streams[IVTV_ENC_STREAM_TYPE_VBI];
	if (s->type == IVTV_ENC_STREAM_TYPE_MPG &&
	    test_bit(IVTV_F_S_INTERNAL_USE, &s_vbi->s_flags) &&
	    !test_and_set_bit(IVTV_F_S_STREAMING, &s_vbi->s_flags)) {
		/* Note: the IVTV_ENC_STREAM_TYPE_VBI is claimed
		   automatically when the MPG stream is claimed.
		   We only need to start the VBI capturing. */
		if (ivtv_start_v4l2_encode_stream(s_vbi)) {
			IVTV_DEBUG_WARN("VBI capture start failed\n");

			/* Failure, clean up and return an error */
			clear_bit(IVTV_F_S_STREAMING, &s_vbi->s_flags);
			clear_bit(IVTV_F_S_STREAMING, &s->s_flags);
			/* also releases the associated VBI stream */
			ivtv_release_stream(s);
			return -EIO;
		}
		IVTV_DEBUG_INFO("VBI insertion started\n");
	}

	/* Tell the card to start capturing */
	if (!ivtv_start_v4l2_encode_stream(s)) {
		/* We're done */
		set_bit(IVTV_F_S_APPL_IO, &s->s_flags);
		/* Resume a possibly paused encoder */
		if (test_and_clear_bit(IVTV_F_I_ENC_PAUSED, &itv->i_flags))
			ivtv_vapi(itv, CX2341X_ENC_PAUSE_ENCODER, 1, 1);
		return 0;
	}

	/* failure, clean up */
	IVTV_DEBUG_WARN("Failed to start capturing for stream %s\n", s->name);

	/* Note: the IVTV_ENC_STREAM_TYPE_VBI is released
	   automatically when the MPG stream is released.
	   We only need to stop the VBI capturing. */
	if (s->type == IVTV_ENC_STREAM_TYPE_MPG &&
	    test_bit(IVTV_F_S_STREAMING, &s_vbi->s_flags)) {
		ivtv_stop_v4l2_encode_stream(s_vbi, 0);
		clear_bit(IVTV_F_S_STREAMING, &s_vbi->s_flags);
	}
	clear_bit(IVTV_F_S_STREAMING, &s->s_flags);
	ivtv_release_stream(s);
	return -EIO;
}

ssize_t ivtv_v4l2_read(struct file * filp, char __user *buf, size_t count, loff_t * pos)
{
	struct ivtv_open_id *id = filp->private_data;
	struct ivtv *itv = id->itv;
	struct ivtv_stream *s = &itv->streams[id->type];
	int rc;

	IVTV_DEBUG_HI_IOCTL("read %zd bytes from %s\n", count, s->name);

	rc = ivtv_start_capture(id);
	if (rc)
		return rc;
	return ivtv_read_pos(s, buf, count, pos, filp->f_flags & O_NONBLOCK);
}

int ivtv_start_decoding(struct ivtv_open_id *id, int speed)
{
	struct ivtv *itv = id->itv;
	struct ivtv_stream *s = &itv->streams[id->type];

	if (atomic_read(&itv->decoding) == 0) {
		if (ivtv_claim_stream(id, s->type)) {
			/* someone else is using this stream already */
			IVTV_DEBUG_WARN("start decode, stream already claimed\n");
			return -EBUSY;
		}
		ivtv_start_v4l2_decode_stream(s, 0);
	}
	if (s->type == IVTV_DEC_STREAM_TYPE_MPG)
		return ivtv_set_speed(itv, speed);
	return 0;
}

ssize_t ivtv_v4l2_write(struct file *filp, const char __user *user_buf, size_t count, loff_t *pos)
{
	struct ivtv_open_id *id = filp->private_data;
	struct ivtv *itv = id->itv;
	struct ivtv_stream *s = &itv->streams[id->type];
	struct ivtv_buffer *buf;
	struct ivtv_queue q;
	int bytes_written = 0;
	int mode;
	int rc;
	DEFINE_WAIT(wait);

	IVTV_DEBUG_HI_IOCTL("write %zd bytes to %s\n", count, s->name);

	if (s->type != IVTV_DEC_STREAM_TYPE_MPG &&
	    s->type != IVTV_DEC_STREAM_TYPE_YUV &&
	    s->type != IVTV_DEC_STREAM_TYPE_VOUT)
		/* not decoder streams */
		return -EPERM;

	/* Try to claim this stream */
	if (ivtv_claim_stream(id, s->type))
		return -EBUSY;

	/* This stream does not need to start any decoding */
	if (s->type == IVTV_DEC_STREAM_TYPE_VOUT) {
		set_bit(IVTV_F_S_APPL_IO, &s->s_flags);
		return ivtv_write_vbi(itv, user_buf, count);
	}

	mode = s->type == IVTV_DEC_STREAM_TYPE_MPG ? OUT_MPG : OUT_YUV;

	if (ivtv_set_output_mode(itv, mode) != mode) {
	    ivtv_release_stream(s);
	    return -EBUSY;
	}
	ivtv_queue_init(&q);
	set_bit(IVTV_F_S_APPL_IO, &s->s_flags);

retry:
	for (;;) {
		/* Gather buffers */
		while (q.length - q.bytesused < count && (buf = ivtv_dequeue(s, &s->q_io)))
			ivtv_enqueue(s, buf, &q);
		while (q.length - q.bytesused < count && (buf = ivtv_dequeue(s, &s->q_free))) {
			ivtv_enqueue(s, buf, &q);
		}
		if (q.buffers)
			break;
		if (filp->f_flags & O_NONBLOCK)
			return -EAGAIN;
		prepare_to_wait(&s->waitq, &wait, TASK_INTERRUPTIBLE);
		/* New buffers might have become free before we were added to the waitqueue */
		if (!s->q_free.buffers)
			schedule();
		finish_wait(&s->waitq, &wait);
		if (signal_pending(current)) {
			IVTV_DEBUG_INFO("User stopped %s\n", s->name);
			return -EINTR;
		}
	}

	/* copy user data into buffers */
	while ((buf = ivtv_dequeue(s, &q))) {
		/* Make sure we really got all the user data */
		rc = ivtv_buf_copy_from_user(s, buf, user_buf, count);

		if (rc < 0) {
			ivtv_queue_move(s, &q, NULL, &s->q_free, 0);
			return rc;
		}
		user_buf += rc;
		count -= rc;
		bytes_written += rc;

		if (buf->bytesused != s->buf_size) {
			/* incomplete, leave in q_io for next time */
			ivtv_enqueue(s, buf, &s->q_io);
			break;
		}
		/* Byteswap MPEG buffer */
		if (s->type == IVTV_DEC_STREAM_TYPE_MPG)
			ivtv_buf_swap(buf);
		ivtv_enqueue(s, buf, &s->q_full);
	}

	/* Start decoder (returns 0 if already started) */
	rc = ivtv_start_decoding(id, itv->speed);
	if (rc) {
		IVTV_DEBUG_WARN("Failed start decode stream %s\n", s->name);

		/* failure, clean up */
		clear_bit(IVTV_F_S_STREAMING, &s->s_flags);
		clear_bit(IVTV_F_S_APPL_IO, &s->s_flags);
		return rc;
	}
	if (test_bit(IVTV_F_S_NEEDS_DATA, &s->s_flags)) {
		if (s->q_full.length >= itv->dma_data_req_size) {
			int got_sig;

			prepare_to_wait(&itv->dma_waitq, &wait, TASK_INTERRUPTIBLE);
			while (!(got_sig = signal_pending(current)) &&
					test_bit(IVTV_F_S_DMA_PENDING, &s->s_flags)) {
				schedule();
			}
			finish_wait(&itv->dma_waitq, &wait);
			if (got_sig) {
				IVTV_DEBUG_INFO("User interrupted %s\n", s->name);
				return -EINTR;
			}

			clear_bit(IVTV_F_S_NEEDS_DATA, &s->s_flags);
			ivtv_queue_move(s, &s->q_full, NULL, &s->q_predma, itv->dma_data_req_size);
			ivtv_dma_stream_dec_prepare(s, itv->dma_data_req_offset + IVTV_DECODER_OFFSET, 1);
		}
	}
	/* more user data is available, wait until buffers become free
	   to transfer the rest. */
	if (count && !(filp->f_flags & O_NONBLOCK))
		goto retry;
	IVTV_DEBUG_HI_INFO("Wrote %d bytes to %s (%d)\n", bytes_written, s->name, s->q_full.bytesused);
	return bytes_written;
}

unsigned int ivtv_v4l2_dec_poll(struct file *filp, poll_table *wait)
{
	struct ivtv_open_id *id = filp->private_data;
	struct ivtv *itv = id->itv;
	struct ivtv_stream *s = &itv->streams[id->type];
	int res = 0;

	/* add stream's waitq to the poll list */
	poll_wait(filp, &s->waitq, wait);

	set_bit(IVTV_F_I_EV_VSYNC_ENABLED, &itv->i_flags);
	if (test_bit(IVTV_F_I_EV_VSYNC, &itv->i_flags) ||
	    test_bit(IVTV_F_I_EV_DEC_STOPPED, &itv->i_flags))
		res = POLLPRI;

	/* Allow write if buffers are available for writing */
	if (s->q_free.buffers)
		res |= POLLOUT | POLLWRNORM;
	return res;
}

unsigned int ivtv_v4l2_enc_poll(struct file *filp, poll_table * wait)
{
	struct ivtv_open_id *id = filp->private_data;
	struct ivtv *itv = id->itv;
	struct ivtv_stream *s = &itv->streams[id->type];
	int eof = test_bit(IVTV_F_S_STREAMOFF, &s->s_flags);

	/* Start a capture if there is none */
	if (!eof && !test_bit(IVTV_F_S_STREAMING, &s->s_flags)) {
		int rc = ivtv_start_capture(id);

		if (rc) {
			IVTV_DEBUG_INFO("Could not start capture for %s (%d)\n",
					s->name, rc);
			return POLLERR;
		}
	}

	/* add stream's waitq to the poll list */
	poll_wait(filp, &s->waitq, wait);

	if (eof || s->q_full.length)
		return POLLIN | POLLRDNORM;
	return 0;
}

void ivtv_stop_capture(struct ivtv_open_id *id, int gop_end)
{
	struct ivtv *itv = id->itv;
	struct ivtv_stream *s = &itv->streams[id->type];

	IVTV_DEBUG_IOCTL("close() of %s\n", s->name);

	/* 'Unclaim' this stream */

	/* Stop capturing */
	if (test_bit(IVTV_F_S_STREAMING, &s->s_flags)) {
		struct ivtv_stream *s_vbi = &itv->streams[IVTV_ENC_STREAM_TYPE_VBI];

		IVTV_DEBUG_INFO("close stopping capture\n");
		/* Special case: a running VBI capture for VBI insertion
		   in the mpeg stream. Need to stop that too. */
		if (id->type == IVTV_ENC_STREAM_TYPE_MPG &&
		    test_bit(IVTV_F_S_STREAMING, &s_vbi->s_flags) &&
		    !test_bit(IVTV_F_S_APPL_IO, &s_vbi->s_flags)) {
			IVTV_DEBUG_INFO("close stopping embedded VBI capture\n");
			ivtv_stop_v4l2_encode_stream(s_vbi, 0);
		}
		if ((id->type == IVTV_DEC_STREAM_TYPE_VBI ||
		     id->type == IVTV_ENC_STREAM_TYPE_VBI) &&
		    test_bit(IVTV_F_S_INTERNAL_USE, &s->s_flags)) {
			/* Also used internally, don't stop capturing */
			s->id = -1;
		}
		else {
			ivtv_stop_v4l2_encode_stream(s, gop_end);
		}
	}
	clear_bit(IVTV_F_S_APPL_IO, &s->s_flags);
	clear_bit(IVTV_F_S_STREAMOFF, &s->s_flags);

	ivtv_release_stream(s);
}

static void ivtv_stop_decoding(struct ivtv_open_id *id, int flags, u64 pts)
{
	struct ivtv *itv = id->itv;
	struct ivtv_stream *s = &itv->streams[id->type];

	IVTV_DEBUG_IOCTL("close() of %s\n", s->name);

	/* Stop decoding */
	if (test_bit(IVTV_F_S_STREAMING, &s->s_flags)) {
		IVTV_DEBUG_INFO("close stopping decode\n");

		ivtv_stop_v4l2_decode_stream(s, flags, pts);
	}
	clear_bit(IVTV_F_S_APPL_IO, &s->s_flags);
	clear_bit(IVTV_F_S_STREAMOFF, &s->s_flags);
	if (id->type == IVTV_DEC_STREAM_TYPE_YUV && test_bit(IVTV_F_I_DECODING_YUV, &itv->i_flags)) {
		/* Restore registers we've changed & clean up any mess we've made */
		ivtv_yuv_close(itv);
	}
	if (s->type == IVTV_DEC_STREAM_TYPE_YUV && itv->output_mode == OUT_YUV)
	    itv->output_mode = OUT_NONE;
	else if (s->type == IVTV_DEC_STREAM_TYPE_MPG && itv->output_mode == OUT_MPG)
	    itv->output_mode = OUT_NONE;

	itv->speed = 0;
	clear_bit(IVTV_F_I_DEC_PAUSED, &itv->i_flags);
	ivtv_release_stream(s);
}

int ivtv_v4l2_close(struct inode *inode, struct file *filp)
{
	struct ivtv_open_id *id = filp->private_data;
	struct ivtv *itv = id->itv;
	struct ivtv_stream *s = &itv->streams[id->type];

	IVTV_DEBUG_IOCTL("close() of %s\n", s->name);

	v4l2_prio_close(&itv->prio, &id->prio);

	/* Easy case first: this stream was never claimed by us */
	if (s->id != id->open_id) {
		kfree(id);
		return 0;
	}

	/* 'Unclaim' this stream */

	/* Stop radio */
	if (id->type == IVTV_ENC_STREAM_TYPE_RAD) {
		/* Closing radio device, return to TV mode */
		ivtv_mute(itv);
		/* Mark that the radio is no longer in use */
		clear_bit(IVTV_F_I_RADIO_USER, &itv->i_flags);
		/* Switch tuner to TV */
		ivtv_call_i2c_clients(itv, VIDIOC_S_STD, &itv->std);
		/* Select correct audio input (i.e. TV tuner or Line in) */
		ivtv_audio_set_io(itv);
		if (itv->hw_flags & IVTV_HW_SAA711X)
		{
			struct v4l2_crystal_freq crystal_freq;
			crystal_freq.freq = SAA7115_FREQ_32_11_MHZ;
			crystal_freq.flags = 0;
			ivtv_saa7115(itv, VIDIOC_INT_S_CRYSTAL_FREQ, &crystal_freq);
		}
		/* Done! Unmute and continue. */
		ivtv_unmute(itv);
		ivtv_release_stream(s);
	} else if (s->type >= IVTV_DEC_STREAM_TYPE_MPG) {
		struct ivtv_stream *s_vout = &itv->streams[IVTV_DEC_STREAM_TYPE_VOUT];

		ivtv_stop_decoding(id, VIDEO_CMD_STOP_TO_BLACK | VIDEO_CMD_STOP_IMMEDIATELY, 0);

		/* If all output streams are closed, and if the user doesn't have
		   IVTV_DEC_STREAM_TYPE_VOUT open, then disable VBI on TV-out. */
		if (itv->output_mode == OUT_NONE && !test_bit(IVTV_F_S_APPL_IO, &s_vout->s_flags)) {
			/* disable VBI on TV-out */
			ivtv_disable_vbi(itv);
		}
	} else {
		ivtv_stop_capture(id, 0);
	}
	kfree(id);
	return 0;
}

int ivtv_v4l2_open(struct inode *inode, struct file *filp)
{
	int x, y = 0;
	struct ivtv_open_id *item;
	struct ivtv *itv = NULL;
	struct ivtv_stream *s = NULL;
	int minor = iminor(inode);

	/* Find which card this open was on */
	spin_lock(&ivtv_cards_lock);
	for (x = 0; itv == NULL && x < ivtv_cards_active; x++) {
		/* find out which stream this open was on */
		for (y = 0; y < IVTV_MAX_STREAMS; y++) {
			s = &ivtv_cards[x]->streams[y];
			if (s->v4l2dev && s->v4l2dev->minor == minor) {
				itv = ivtv_cards[x];
				break;
			}
		}
	}
	spin_unlock(&ivtv_cards_lock);

	if (itv == NULL) {
		/* Couldn't find a device registered
		   on that minor, shouldn't happen! */
		printk(KERN_WARNING "ivtv:  No ivtv device found on minor %d\n", minor);
		return -ENXIO;
	}

	if (y == IVTV_DEC_STREAM_TYPE_MPG &&
		test_bit(IVTV_F_S_CLAIMED, &itv->streams[IVTV_DEC_STREAM_TYPE_YUV].s_flags))
		return -EBUSY;

	if (y == IVTV_DEC_STREAM_TYPE_YUV &&
		test_bit(IVTV_F_S_CLAIMED, &itv->streams[IVTV_DEC_STREAM_TYPE_MPG].s_flags))
		return -EBUSY;

	if (y == IVTV_DEC_STREAM_TYPE_YUV) {
		if (read_reg(0x82c) == 0) {
			IVTV_ERR("Tried to open YUV output device but need to send data to mpeg decoder before it can be used\n");
			/* return -ENODEV; */
		}
		ivtv_udma_alloc(itv);
	}

	/* Allocate memory */
	item = kmalloc(sizeof(struct ivtv_open_id), GFP_KERNEL);
	if (NULL == item) {
		IVTV_DEBUG_WARN("nomem on v4l2 open\n");
		return -ENOMEM;
	}
	item->itv = itv;
	item->type = y;
	v4l2_prio_open(&itv->prio, &item->prio);

	item->open_id = itv->open_id++;
	filp->private_data = item;

	if (item->type == IVTV_ENC_STREAM_TYPE_RAD) {
		/* Try to claim this stream */
		if (ivtv_claim_stream(item, item->type)) {
			/* No, it's already in use */
			kfree(item);
			return -EBUSY;
		}

		/* We have the radio */
		ivtv_mute(itv);
		/* Switch tuner to radio */
		ivtv_call_i2c_clients(itv, AUDC_SET_RADIO, NULL);
		/* Mark that the radio is being used. */
		set_bit(IVTV_F_I_RADIO_USER, &itv->i_flags);
		/* Select the correct audio input (i.e. radio tuner) */
		ivtv_audio_set_io(itv);
		if (itv->hw_flags & IVTV_HW_SAA711X)
		{
			struct v4l2_crystal_freq crystal_freq;
			crystal_freq.freq = SAA7115_FREQ_32_11_MHZ;
			crystal_freq.flags = SAA7115_FREQ_FL_APLL;
			ivtv_saa7115(itv, VIDIOC_INT_S_CRYSTAL_FREQ, &crystal_freq);
		}
		/* Done! Unmute and continue. */
		ivtv_unmute(itv);
	}

	/* YUV or MPG Decoding Mode? */
	if (y == IVTV_DEC_STREAM_TYPE_MPG)
		clear_bit(IVTV_F_I_DEC_YUV, &itv->i_flags);
	else if (y == IVTV_DEC_STREAM_TYPE_YUV)
	{
		set_bit(IVTV_F_I_DEC_YUV, &itv->i_flags);
	}

	return 0;
}

void ivtv_mute(struct ivtv *itv)
{
	struct v4l2_control ctrl = { V4L2_CID_AUDIO_MUTE, 1 };

	/* Mute sound to avoid pop */
	ivtv_control_ioctls(itv, VIDIOC_S_CTRL, &ctrl);

	if (atomic_read(&itv->capturing))
		ivtv_vapi(itv, CX2341X_ENC_MUTE_AUDIO, 1, 1);

	IVTV_DEBUG_INFO("Mute\n");
}

void ivtv_unmute(struct ivtv *itv)
{
	struct v4l2_control ctrl = { V4L2_CID_AUDIO_MUTE, 0 };

	/* initialize or refresh input */
	if (atomic_read(&itv->capturing) == 0)
		ivtv_vapi(itv, CX2341X_ENC_INITIALIZE_INPUT, 0);

	ivtv_msleep_timeout(100, 0);

	if (atomic_read(&itv->capturing)) {
		ivtv_vapi(itv, CX2341X_ENC_MISC, 1, 12);
		ivtv_vapi(itv, CX2341X_ENC_MUTE_AUDIO, 1, 0);
	}

	/* Unmute */
	ivtv_control_ioctls(itv, VIDIOC_S_CTRL, &ctrl);
	IVTV_DEBUG_INFO("Unmute\n");
}