summaryrefslogtreecommitdiffstats
path: root/sound/usb/usx2y/usbusx2yaudio.c
blob: c5989cb7db3f6c07e819fd95b3894f55ee30a6c3 (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
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
/*
 *   US-X2Y AUDIO
 *   Copyright (c) 2002-2004 by Karsten Wiese
 *
 *   based on
 *
 *   (Tentative) USB Audio Driver for ALSA
 *
 *   Main and PCM part
 *
 *   Copyright (c) 2002 by Takashi Iwai <tiwai@suse.de>
 *
 *   Many codes borrowed from audio.c by 
 *	    Alan Cox (alan@lxorguk.ukuu.org.uk)
 *	    Thomas Sailer (sailer@ife.ee.ethz.ch)
 *
 *
 *   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 <sound/driver.h>
#include <linux/interrupt.h>
#include <linux/usb.h>
#include <sound/core.h>
#include <sound/info.h>
#include <sound/pcm.h>
#include <sound/pcm_params.h>
#include "usx2y.h"
#include "usbusx2y.h"

#define USX2Y_NRPACKS 4			/* Default value used for nr of packs per urb.
					  1 to 4 have been tested ok on uhci.
					  To use 3 on ohci, you'd need a patch:
					  look for "0000425-linux-2.6.9-rc4-mm1_ohci-hcd.patch.gz" on
					  "https://bugtrack.alsa-project.org/alsa-bug/bug_view_page.php?bug_id=0000425"
					  .
					  1, 2 and 4 work out of the box on ohci, if I recall correctly.
					  Bigger is safer operation,
					  smaller gives lower latencies.
					*/
#define USX2Y_NRPACKS_VARIABLE y	/* If your system works ok with this module's parameter
					   nrpacks set to 1, you might as well comment 
					   this #define out, and thereby produce smaller, faster code.
					   You'd also set USX2Y_NRPACKS to 1 then.
					*/

#ifdef USX2Y_NRPACKS_VARIABLE
 static int nrpacks = USX2Y_NRPACKS; /* number of packets per urb */
 #define  nr_of_packs() nrpacks
 module_param(nrpacks, int, 0444);
 MODULE_PARM_DESC(nrpacks, "Number of packets per URB.");
#else
 #define nr_of_packs() USX2Y_NRPACKS
#endif


static int usX2Y_urb_capt_retire(snd_usX2Y_substream_t *subs)
{
	struct urb	*urb = subs->completed_urb;
	snd_pcm_runtime_t *runtime = subs->pcm_substream->runtime;
	unsigned char	*cp;
	int 		i, len, lens = 0, hwptr_done = subs->hwptr_done;
	usX2Ydev_t	*usX2Y = subs->usX2Y;

	for (i = 0; i < nr_of_packs(); i++) {
		cp = (unsigned char*)urb->transfer_buffer + urb->iso_frame_desc[i].offset;
		if (urb->iso_frame_desc[i].status) { /* active? hmm, skip this */
			snd_printk(KERN_ERR "activ frame status %i. Most propably some hardware problem.\n", urb->iso_frame_desc[i].status);
			return urb->iso_frame_desc[i].status;
		}
		len = urb->iso_frame_desc[i].actual_length / usX2Y->stride;
		if (! len) {
			snd_printd("0 == len ERROR!\n");
			continue;
		}

		/* copy a data chunk */
		if ((hwptr_done + len) > runtime->buffer_size) {
			int cnt = runtime->buffer_size - hwptr_done;
			int blen = cnt * usX2Y->stride;
			memcpy(runtime->dma_area + hwptr_done * usX2Y->stride, cp, blen);
			memcpy(runtime->dma_area, cp + blen, len * usX2Y->stride - blen);
		} else {
			memcpy(runtime->dma_area + hwptr_done * usX2Y->stride, cp, len * usX2Y->stride);
		}
		lens += len;
		if ((hwptr_done += len) >= runtime->buffer_size)
			hwptr_done -= runtime->buffer_size;
	}

	subs->hwptr_done = hwptr_done;
	subs->transfer_done += lens;
	/* update the pointer, call callback if necessary */
	if (subs->transfer_done >= runtime->period_size) {
		subs->transfer_done -= runtime->period_size;
		snd_pcm_period_elapsed(subs->pcm_substream);
	}
	return 0;
}
/*
 * prepare urb for playback data pipe
 *
 * we copy the data directly from the pcm buffer.
 * the current position to be copied is held in hwptr field.
 * since a urb can handle only a single linear buffer, if the total
 * transferred area overflows the buffer boundary, we cannot send
 * it directly from the buffer.  thus the data is once copied to
 * a temporary buffer and urb points to that.
 */
static int usX2Y_urb_play_prepare(snd_usX2Y_substream_t *subs,
				  struct urb *cap_urb,
				  struct urb *urb)
{
	int count, counts, pack;
	usX2Ydev_t* usX2Y = subs->usX2Y;
	snd_pcm_runtime_t *runtime = subs->pcm_substream->runtime;

	count = 0;
	for (pack = 0; pack <  nr_of_packs(); pack++) {
		/* calculate the size of a packet */
		counts = cap_urb->iso_frame_desc[pack].actual_length / usX2Y->stride;
		count += counts;
		if (counts < 43 || counts > 50) {
			snd_printk(KERN_ERR "should not be here with counts=%i\n", counts);
			return -EPIPE;
		}
		/* set up descriptor */
		urb->iso_frame_desc[pack].offset = pack ?
			urb->iso_frame_desc[pack - 1].offset + urb->iso_frame_desc[pack - 1].length :
			0;
		urb->iso_frame_desc[pack].length = cap_urb->iso_frame_desc[pack].actual_length;
	}
	if (atomic_read(&subs->state) >= state_PRERUNNING)
		if (subs->hwptr + count > runtime->buffer_size) {
			/* err, the transferred area goes over buffer boundary.
			 * copy the data to the temp buffer.
			 */
			int len;
			len = runtime->buffer_size - subs->hwptr;
			urb->transfer_buffer = subs->tmpbuf;
			memcpy(subs->tmpbuf, runtime->dma_area + subs->hwptr * usX2Y->stride, len * usX2Y->stride);
			memcpy(subs->tmpbuf + len * usX2Y->stride, runtime->dma_area, (count - len) * usX2Y->stride);
			subs->hwptr += count;
			subs->hwptr -= runtime->buffer_size;
		} else {
			/* set the buffer pointer */
			urb->transfer_buffer = runtime->dma_area + subs->hwptr * usX2Y->stride;
			if ((subs->hwptr += count) >= runtime->buffer_size)
			subs->hwptr -= runtime->buffer_size;			
		}
	else
		urb->transfer_buffer = subs->tmpbuf;
	urb->transfer_buffer_length = count * usX2Y->stride;
	return 0;
}

/*
 * process after playback data complete
 *
 * update the current position and call callback if a period is processed.
 */
static void usX2Y_urb_play_retire(snd_usX2Y_substream_t *subs, struct urb *urb)
{
	snd_pcm_runtime_t *runtime = subs->pcm_substream->runtime;
	int		len = urb->actual_length / subs->usX2Y->stride;

	subs->transfer_done += len;
	subs->hwptr_done +=  len;
	if (subs->hwptr_done >= runtime->buffer_size)
		subs->hwptr_done -= runtime->buffer_size;
	if (subs->transfer_done >= runtime->period_size) {
		subs->transfer_done -= runtime->period_size;
		snd_pcm_period_elapsed(subs->pcm_substream);
	}
}

static int usX2Y_urb_submit(snd_usX2Y_substream_t *subs, struct urb *urb, int frame)
{
	int err;
	if (!urb)
		return -ENODEV;
	urb->start_frame = (frame + NRURBS * nr_of_packs());  // let hcd do rollover sanity checks
	urb->hcpriv = NULL;
	urb->dev = subs->usX2Y->chip.dev; /* we need to set this at each time */
	if ((err = usb_submit_urb(urb, GFP_ATOMIC)) < 0) {
		snd_printk(KERN_ERR "usb_submit_urb() returned %i\n", err);
		return err;
	}
	return 0;
}

static inline int usX2Y_usbframe_complete(snd_usX2Y_substream_t *capsubs, snd_usX2Y_substream_t *playbacksubs, int frame)
{
	int err, state;
	{
		struct urb *urb = playbacksubs->completed_urb;

		state = atomic_read(&playbacksubs->state);
		if (NULL != urb) {
			if (state == state_RUNNING)
				usX2Y_urb_play_retire(playbacksubs, urb);
			else
				if (state >= state_PRERUNNING) {
					atomic_inc(&playbacksubs->state);
				}
		} else {
			switch (state) {
			case state_STARTING1:
				urb = playbacksubs->urb[0];
				atomic_inc(&playbacksubs->state);
				break;
			case state_STARTING2:
				urb = playbacksubs->urb[1];
				atomic_inc(&playbacksubs->state);
				break;
			}
		}
		if (urb) {
			if ((err = usX2Y_urb_play_prepare(playbacksubs, capsubs->completed_urb, urb)) ||
			    (err = usX2Y_urb_submit(playbacksubs, urb, frame))) {
				return err;
			}
		}

		playbacksubs->completed_urb = NULL;
	}
	state = atomic_read(&capsubs->state);
	if (state >= state_PREPARED) {
		if (state == state_RUNNING) {
			if ((err = usX2Y_urb_capt_retire(capsubs)))
				return err;
		} else
			if (state >= state_PRERUNNING) {
				atomic_inc(&capsubs->state);
			}
		if ((err = usX2Y_urb_submit(capsubs, capsubs->completed_urb, frame)))
			return err;
	}
	capsubs->completed_urb = NULL;
	return 0;
}


static void usX2Y_clients_stop(usX2Ydev_t *usX2Y)
{
	int s, u;
	for (s = 0; s < 4; s++) {
		snd_usX2Y_substream_t *subs = usX2Y->subs[s];
		if (subs) {
			snd_printdd("%i %p state=%i\n", s, subs, atomic_read(&subs->state));
			atomic_set(&subs->state, state_STOPPED);
		}
	}
	for (s = 0; s < 4; s++) {
		snd_usX2Y_substream_t *subs = usX2Y->subs[s];
		if (subs) {
			if (atomic_read(&subs->state) >= state_PRERUNNING) {
				snd_pcm_stop(subs->pcm_substream, SNDRV_PCM_STATE_XRUN);
			}
			for (u = 0; u < NRURBS; u++) {
				struct urb *urb = subs->urb[u];
				if (NULL != urb)
					snd_printdd("%i status=%i start_frame=%i\n", u, urb->status, urb->start_frame);
			}
		}
	}
	usX2Y->prepare_subs = NULL;
	wake_up(&usX2Y->prepare_wait_queue);
}

static void usX2Y_error_urb_status(usX2Ydev_t *usX2Y, snd_usX2Y_substream_t *subs, struct urb *urb)
{
	snd_printk(KERN_ERR "ep=%i stalled with status=%i\n", subs->endpoint, urb->status);
	urb->status = 0;
	usX2Y_clients_stop(usX2Y);
}

static void usX2Y_error_sequence(usX2Ydev_t *usX2Y, snd_usX2Y_substream_t *subs, struct urb *urb)
{
	snd_printk(KERN_ERR "Sequence Error!(hcd_frame=%i ep=%i%s;wait=%i,frame=%i).\n"
		   KERN_ERR "Most propably some urb of usb-frame %i is still missing.\n"
		   KERN_ERR "Cause could be too long delays in usb-hcd interrupt handling.\n",
		   usb_get_current_frame_number(usX2Y->chip.dev),
		   subs->endpoint, usb_pipein(urb->pipe) ? "in" : "out", usX2Y->wait_iso_frame, urb->start_frame, usX2Y->wait_iso_frame);
	usX2Y_clients_stop(usX2Y);
}

static void i_usX2Y_urb_complete(struct urb *urb, struct pt_regs *regs)
{
	snd_usX2Y_substream_t *subs = (snd_usX2Y_substream_t*)urb->context;
	usX2Ydev_t *usX2Y = subs->usX2Y;

	if (unlikely(atomic_read(&subs->state) < state_PREPARED)) {
		snd_printdd("hcd_frame=%i ep=%i%s status=%i start_frame=%i\n", usb_get_current_frame_number(usX2Y->chip.dev), subs->endpoint, usb_pipein(urb->pipe) ? "in" : "out", urb->status, urb->start_frame);
		return;
	}
	if (unlikely(urb->status)) {
		usX2Y_error_urb_status(usX2Y, subs, urb);
		return;
	}
	if (likely((0xFFFF & urb->start_frame) == usX2Y->wait_iso_frame))
		subs->completed_urb = urb;
	else {
		usX2Y_error_sequence(usX2Y, subs, urb);
		return;
	}
	{
		snd_usX2Y_substream_t *capsubs = usX2Y->subs[SNDRV_PCM_STREAM_CAPTURE],
			*playbacksubs = usX2Y->subs[SNDRV_PCM_STREAM_PLAYBACK];
		if (capsubs->completed_urb && atomic_read(&capsubs->state) >= state_PREPARED &&
		    (playbacksubs->completed_urb || atomic_read(&playbacksubs->state) < state_PREPARED)) {
			if (!usX2Y_usbframe_complete(capsubs, playbacksubs, urb->start_frame)) {
				if (nr_of_packs() <= urb->start_frame &&
				    urb->start_frame <= (2 * nr_of_packs() - 1))	// uhci and ohci
					usX2Y->wait_iso_frame = urb->start_frame - nr_of_packs();
				else
					usX2Y->wait_iso_frame +=  nr_of_packs();
			} else {
				snd_printdd("\n");
				usX2Y_clients_stop(usX2Y);
			}
		}
	}
}

static void usX2Y_urbs_set_complete(usX2Ydev_t * usX2Y, void (*complete)(struct urb *, struct pt_regs *))
{
	int s, u;
	for (s = 0; s < 4; s++) {
		snd_usX2Y_substream_t *subs = usX2Y->subs[s];
		if (NULL != subs)
			for (u = 0; u < NRURBS; u++) {
				struct urb * urb = subs->urb[u];
				if (NULL != urb)
					urb->complete = complete;
			}
	}
}

static void usX2Y_subs_startup_finish(usX2Ydev_t * usX2Y)
{
	usX2Y_urbs_set_complete(usX2Y, i_usX2Y_urb_complete);
	usX2Y->prepare_subs = NULL;
}

static void i_usX2Y_subs_startup(struct urb *urb, struct pt_regs *regs)
{
	snd_usX2Y_substream_t *subs = (snd_usX2Y_substream_t*)urb->context;
	usX2Ydev_t *usX2Y = subs->usX2Y;
	snd_usX2Y_substream_t *prepare_subs = usX2Y->prepare_subs;
	if (NULL != prepare_subs)
		if (urb->start_frame == prepare_subs->urb[0]->start_frame) {
			usX2Y_subs_startup_finish(usX2Y);
			atomic_inc(&prepare_subs->state);
			wake_up(&usX2Y->prepare_wait_queue);
		}

	i_usX2Y_urb_complete(urb, regs);
}

static void usX2Y_subs_prepare(snd_usX2Y_substream_t *subs)
{
	snd_printdd("usX2Y_substream_prepare(%p) ep=%i urb0=%p urb1=%p\n", subs, subs->endpoint, subs->urb[0], subs->urb[1]);
	/* reset the pointer */
	subs->hwptr = 0;
	subs->hwptr_done = 0;
	subs->transfer_done = 0;
}


static void usX2Y_urb_release(struct urb** urb, int free_tb)
{
	if (*urb) {
		usb_kill_urb(*urb);
		if (free_tb)
			kfree((*urb)->transfer_buffer);
		usb_free_urb(*urb);
		*urb = NULL;
	}
}
/*
 * release a substreams urbs
 */
static void usX2Y_urbs_release(snd_usX2Y_substream_t *subs)
{
	int i;
	snd_printdd("usX2Y_urbs_release() %i\n", subs->endpoint);
	for (i = 0; i < NRURBS; i++)
		usX2Y_urb_release(subs->urb + i, subs != subs->usX2Y->subs[SNDRV_PCM_STREAM_PLAYBACK]);

	kfree(subs->tmpbuf);
	subs->tmpbuf = NULL;
}
/*
 * initialize a substream's urbs
 */
static int usX2Y_urbs_allocate(snd_usX2Y_substream_t *subs)
{
	int i;
	unsigned int pipe;
	int is_playback = subs == subs->usX2Y->subs[SNDRV_PCM_STREAM_PLAYBACK];
	struct usb_device *dev = subs->usX2Y->chip.dev;

	pipe = is_playback ? usb_sndisocpipe(dev, subs->endpoint) :
			usb_rcvisocpipe(dev, subs->endpoint);
	subs->maxpacksize = usb_maxpacket(dev, pipe, is_playback);
	if (!subs->maxpacksize)
		return -EINVAL;

	if (is_playback && NULL == subs->tmpbuf) {	/* allocate a temporary buffer for playback */
		subs->tmpbuf = kcalloc(nr_of_packs(), subs->maxpacksize, GFP_KERNEL);
		if (NULL == subs->tmpbuf) {
			snd_printk(KERN_ERR "cannot malloc tmpbuf\n");
			return -ENOMEM;
		}
	}
	/* allocate and initialize data urbs */
	for (i = 0; i < NRURBS; i++) {
		struct urb** purb = subs->urb + i;
		if (*purb) {
			usb_kill_urb(*purb);
			continue;
		}
		*purb = usb_alloc_urb(nr_of_packs(), GFP_KERNEL);
		if (NULL == *purb) {
			usX2Y_urbs_release(subs);
			return -ENOMEM;
		}
		if (!is_playback && !(*purb)->transfer_buffer) {
			/* allocate a capture buffer per urb */
			(*purb)->transfer_buffer = kmalloc(subs->maxpacksize * nr_of_packs(), GFP_KERNEL);
			if (NULL == (*purb)->transfer_buffer) {
				usX2Y_urbs_release(subs);
				return -ENOMEM;
			}
		}
		(*purb)->dev = dev;
		(*purb)->pipe = pipe;
		(*purb)->number_of_packets = nr_of_packs();
		(*purb)->context = subs;
		(*purb)->interval = 1;
		(*purb)->complete = i_usX2Y_subs_startup;
	}
	return 0;
}

static void usX2Y_subs_startup(snd_usX2Y_substream_t *subs)
{
	usX2Ydev_t *usX2Y = subs->usX2Y;
	usX2Y->prepare_subs = subs;
	subs->urb[0]->start_frame = -1;
	wmb();
	usX2Y_urbs_set_complete(usX2Y, i_usX2Y_subs_startup);
}

static int usX2Y_urbs_start(snd_usX2Y_substream_t *subs)
{
	int i, err;
	usX2Ydev_t *usX2Y = subs->usX2Y;

	if ((err = usX2Y_urbs_allocate(subs)) < 0)
		return err;
	subs->completed_urb = NULL;
	for (i = 0; i < 4; i++) {
		snd_usX2Y_substream_t *subs = usX2Y->subs[i];
		if (subs != NULL && atomic_read(&subs->state) >= state_PREPARED)
			goto start;
	}
	usX2Y->wait_iso_frame = -1;
 start:
	{
		usX2Y_subs_startup(subs);
		for (i = 0; i < NRURBS; i++) {
			struct urb *urb = subs->urb[i];
			if (usb_pipein(urb->pipe)) {
				unsigned long pack;
				if (0 == i)
					atomic_set(&subs->state, state_STARTING3);
				urb->dev = usX2Y->chip.dev;
				urb->transfer_flags = URB_ISO_ASAP;
				for (pack = 0; pack < nr_of_packs(); pack++) {
					urb->iso_frame_desc[pack].offset = subs->maxpacksize * pack;
					urb->iso_frame_desc[pack].length = subs->maxpacksize;
				}
				urb->transfer_buffer_length = subs->maxpacksize * nr_of_packs(); 
				if ((err = usb_submit_urb(urb, GFP_ATOMIC)) < 0) {
					snd_printk (KERN_ERR "cannot submit datapipe for urb %d, err = %d\n", i, err);
					err = -EPIPE;
					goto cleanup;
				} else {
					if (0 > usX2Y->wait_iso_frame)
						usX2Y->wait_iso_frame = urb->start_frame;
				}
				urb->transfer_flags = 0;
			} else {
				atomic_set(&subs->state, state_STARTING1);
				break;
			}
		}
		err = 0;
		wait_event(usX2Y->prepare_wait_queue, NULL == usX2Y->prepare_subs);
		if (atomic_read(&subs->state) != state_PREPARED) {
			err = -EPIPE;
		}

	cleanup:
		if (err) {
			usX2Y_subs_startup_finish(usX2Y);
			usX2Y_clients_stop(usX2Y);		// something is completely wroong > stop evrything
		}
	}
	return err;
}

/*
 * return the current pcm pointer.  just return the hwptr_done value.
 */
static snd_pcm_uframes_t snd_usX2Y_pcm_pointer(snd_pcm_substream_t *substream)
{
	snd_usX2Y_substream_t *subs = (snd_usX2Y_substream_t *)substream->runtime->private_data;
	return subs->hwptr_done;
}
/*
 * start/stop substream
 */
static int snd_usX2Y_pcm_trigger(snd_pcm_substream_t *substream, int cmd)
{
	snd_usX2Y_substream_t *subs = (snd_usX2Y_substream_t *)substream->runtime->private_data;

	switch (cmd) {
	case SNDRV_PCM_TRIGGER_START:
		snd_printdd("snd_usX2Y_pcm_trigger(START)\n");
		if (atomic_read(&subs->state) == state_PREPARED &&
		    atomic_read(&subs->usX2Y->subs[SNDRV_PCM_STREAM_CAPTURE]->state) >= state_PREPARED) {
			atomic_set(&subs->state, state_PRERUNNING);
		} else {
			snd_printdd("\n");
			return -EPIPE;
		}
		break;
	case SNDRV_PCM_TRIGGER_STOP:
		snd_printdd("snd_usX2Y_pcm_trigger(STOP)\n");
		if (atomic_read(&subs->state) >= state_PRERUNNING)
			atomic_set(&subs->state, state_PREPARED);
		break;
	default:
		return -EINVAL;
	}
	return 0;
}


/*
 * allocate a buffer, setup samplerate
 *
 * so far we use a physically linear buffer although packetize transfer
 * doesn't need a continuous area.
 * if sg buffer is supported on the later version of alsa, we'll follow
 * that.
 */
static struct s_c2
{
	char c1, c2;
}
	SetRate44100[] =
{
	{ 0x14, 0x08},	// this line sets 44100, well actually a little less
	{ 0x18, 0x40},	// only tascam / frontier design knows the further lines .......
	{ 0x18, 0x42},
	{ 0x18, 0x45},
	{ 0x18, 0x46},
	{ 0x18, 0x48},
	{ 0x18, 0x4A},
	{ 0x18, 0x4C},
	{ 0x18, 0x4E},
	{ 0x18, 0x50},
	{ 0x18, 0x52},
	{ 0x18, 0x54},
	{ 0x18, 0x56},
	{ 0x18, 0x58},
	{ 0x18, 0x5A},
	{ 0x18, 0x5C},
	{ 0x18, 0x5E},
	{ 0x18, 0x60},
	{ 0x18, 0x62},
	{ 0x18, 0x64},
	{ 0x18, 0x66},
	{ 0x18, 0x68},
	{ 0x18, 0x6A},
	{ 0x18, 0x6C},
	{ 0x18, 0x6E},
	{ 0x18, 0x70},
	{ 0x18, 0x72},
	{ 0x18, 0x74},
	{ 0x18, 0x76},
	{ 0x18, 0x78},
	{ 0x18, 0x7A},
	{ 0x18, 0x7C},
	{ 0x18, 0x7E}
};
static struct s_c2 SetRate48000[] =
{
	{ 0x14, 0x09},	// this line sets 48000, well actually a little less
	{ 0x18, 0x40},	// only tascam / frontier design knows the further lines .......
	{ 0x18, 0x42},
	{ 0x18, 0x45},
	{ 0x18, 0x46},
	{ 0x18, 0x48},
	{ 0x18, 0x4A},
	{ 0x18, 0x4C},
	{ 0x18, 0x4E},
	{ 0x18, 0x50},
	{ 0x18, 0x52},
	{ 0x18, 0x54},
	{ 0x18, 0x56},
	{ 0x18, 0x58},
	{ 0x18, 0x5A},
	{ 0x18, 0x5C},
	{ 0x18, 0x5E},
	{ 0x18, 0x60},
	{ 0x18, 0x62},
	{ 0x18, 0x64},
	{ 0x18, 0x66},
	{ 0x18, 0x68},
	{ 0x18, 0x6A},
	{ 0x18, 0x6C},
	{ 0x18, 0x6E},
	{ 0x18, 0x70},
	{ 0x18, 0x73},
	{ 0x18, 0x74},
	{ 0x18, 0x76},
	{ 0x18, 0x78},
	{ 0x18, 0x7A},
	{ 0x18, 0x7C},
	{ 0x18, 0x7E}
};
#define NOOF_SETRATE_URBS ARRAY_SIZE(SetRate48000)

static void i_usX2Y_04Int(struct urb* urb, struct pt_regs *regs)
{
	usX2Ydev_t*	usX2Y = urb->context;
	
	if (urb->status)
		snd_printk(KERN_ERR "snd_usX2Y_04Int() urb->status=%i\n", urb->status);
	if (0 == --usX2Y->US04->len)
		wake_up(&usX2Y->In04WaitQueue);
}

static int usX2Y_rate_set(usX2Ydev_t *usX2Y, int rate)
{
	int			err = 0, i;
	snd_usX2Y_urbSeq_t	*us = NULL;
	int			*usbdata = NULL;
	struct s_c2		*ra = rate == 48000 ? SetRate48000 : SetRate44100;

	if (usX2Y->rate != rate) {
		us = kmalloc(sizeof(*us) + sizeof(struct urb*) * NOOF_SETRATE_URBS, GFP_KERNEL);
		if (NULL == us) {
			err = -ENOMEM;
			goto cleanup;
		}
		memset(us, 0, sizeof(*us) + sizeof(struct urb*) * NOOF_SETRATE_URBS); 
		usbdata = kmalloc(sizeof(int)*NOOF_SETRATE_URBS, GFP_KERNEL);
		if (NULL == usbdata) {
			err = -ENOMEM;
			goto cleanup;
		}
		for (i = 0; i < NOOF_SETRATE_URBS; ++i) {
			if (NULL == (us->urb[i] = usb_alloc_urb(0, GFP_KERNEL))) {
				err = -ENOMEM;
				goto cleanup;
			}
			((char*)(usbdata + i))[0] = ra[i].c1;
			((char*)(usbdata + i))[1] = ra[i].c2;
			usb_fill_bulk_urb(us->urb[i], usX2Y->chip.dev, usb_sndbulkpipe(usX2Y->chip.dev, 4),
					  usbdata + i, 2, i_usX2Y_04Int, usX2Y);
#ifdef OLD_USB
			us->urb[i]->transfer_flags = USB_QUEUE_BULK;
#endif
		}
		us->submitted =	0;
		us->len =	NOOF_SETRATE_URBS;
		usX2Y->US04 =	us;
		wait_event_timeout(usX2Y->In04WaitQueue, 0 == us->len, HZ);
		usX2Y->US04 =	NULL;
		if (us->len)
			err = -ENODEV;
	cleanup:
		if (us) {
			us->submitted =	2*NOOF_SETRATE_URBS;
			for (i = 0; i < NOOF_SETRATE_URBS; ++i) {
				struct urb *urb = us->urb[i];
				if (urb->status) {
					if (!err)
						err = -ENODEV;
					usb_kill_urb(urb);
				}
				usb_free_urb(urb);
			}
			usX2Y->US04 = NULL;
			kfree(usbdata);
			kfree(us);
			if (!err) {
				usX2Y->rate = rate;
			}
		}
	}

	return err;
}


static int usX2Y_format_set(usX2Ydev_t *usX2Y, snd_pcm_format_t format)
{
	int alternate, err;
	struct list_head* p;
	if (format == SNDRV_PCM_FORMAT_S24_3LE) {
		alternate = 2;
		usX2Y->stride = 6;
	} else {
		alternate = 1;
		usX2Y->stride = 4;
	}
	list_for_each(p, &usX2Y->chip.midi_list) {
		snd_usbmidi_input_stop(p);
	}
	usb_kill_urb(usX2Y->In04urb);
	if ((err = usb_set_interface(usX2Y->chip.dev, 0, alternate))) {
		snd_printk(KERN_ERR "usb_set_interface error \n");
		return err;
	}
	usX2Y->In04urb->dev = usX2Y->chip.dev;
	err = usb_submit_urb(usX2Y->In04urb, GFP_KERNEL);
	list_for_each(p, &usX2Y->chip.midi_list) {
		snd_usbmidi_input_start(p);
	}
	usX2Y->format = format;
	usX2Y->rate = 0;
	return err;
}


static int snd_usX2Y_pcm_hw_params(snd_pcm_substream_t *substream,
				   snd_pcm_hw_params_t *hw_params)
{
	int			err = 0;
	unsigned int		rate = params_rate(hw_params);
	snd_pcm_format_t	format = params_format(hw_params);
	snd_printdd("snd_usX2Y_hw_params(%p, %p)\n", substream, hw_params);

	{	// all pcm substreams off one usX2Y have to operate at the same rate & format
		snd_card_t *card = substream->pstr->pcm->card;
		struct list_head *list;
		list_for_each(list, &card->devices) {
			snd_device_t *dev;
			snd_pcm_t *pcm;
			int s;
			dev = snd_device(list);
			if (dev->type != SNDRV_DEV_PCM)
				continue;
			pcm = dev->device_data;
			for (s = 0; s < 2; ++s) {
				snd_pcm_substream_t *test_substream;
				test_substream = pcm->streams[s].substream;
				if (test_substream && test_substream != substream  &&
				    test_substream->runtime &&
				    ((test_substream->runtime->format &&
				      test_substream->runtime->format != format) ||
				     (test_substream->runtime->rate &&
				      test_substream->runtime->rate != rate)))
					return -EINVAL;
			}
		}
	}
	if (0 > (err = snd_pcm_lib_malloc_pages(substream, params_buffer_bytes(hw_params)))) {
		snd_printk(KERN_ERR "snd_pcm_lib_malloc_pages(%p, %i) returned %i\n", substream, params_buffer_bytes(hw_params), err);
		return err;
	}
	return 0;
}

/*
 * free the buffer
 */
static int snd_usX2Y_pcm_hw_free(snd_pcm_substream_t *substream)
{
	snd_pcm_runtime_t *runtime = substream->runtime;
	snd_usX2Y_substream_t *subs = (snd_usX2Y_substream_t *)runtime->private_data;
	down(&subs->usX2Y->prepare_mutex);
	snd_printdd("snd_usX2Y_hw_free(%p)\n", substream);

	if (SNDRV_PCM_STREAM_PLAYBACK == substream->stream) {
		snd_usX2Y_substream_t *cap_subs = subs->usX2Y->subs[SNDRV_PCM_STREAM_CAPTURE];
		atomic_set(&subs->state, state_STOPPED);
		usX2Y_urbs_release(subs);
		if (!cap_subs->pcm_substream ||
		    !cap_subs->pcm_substream->runtime ||
		    !cap_subs->pcm_substream->runtime->status ||
		    cap_subs->pcm_substream->runtime->status->state < SNDRV_PCM_STATE_PREPARED) {
			atomic_set(&cap_subs->state, state_STOPPED);
			usX2Y_urbs_release(cap_subs);
		}
	} else {
		snd_usX2Y_substream_t *playback_subs = subs->usX2Y->subs[SNDRV_PCM_STREAM_PLAYBACK];
		if (atomic_read(&playback_subs->state) < state_PREPARED) {
			atomic_set(&subs->state, state_STOPPED);
			usX2Y_urbs_release(subs);
		}
	}
	up(&subs->usX2Y->prepare_mutex);
	return snd_pcm_lib_free_pages(substream);
}
/*
 * prepare callback
 *
 * set format and initialize urbs
 */
static int snd_usX2Y_pcm_prepare(snd_pcm_substream_t *substream)
{
	snd_pcm_runtime_t *runtime = substream->runtime;
	snd_usX2Y_substream_t *subs = (snd_usX2Y_substream_t *)runtime->private_data;
	usX2Ydev_t *usX2Y = subs->usX2Y;
	snd_usX2Y_substream_t *capsubs = subs->usX2Y->subs[SNDRV_PCM_STREAM_CAPTURE];
	int err = 0;
	snd_printdd("snd_usX2Y_pcm_prepare(%p)\n", substream);

	down(&usX2Y->prepare_mutex);
	usX2Y_subs_prepare(subs);
// Start hardware streams
// SyncStream first....
	if (atomic_read(&capsubs->state) < state_PREPARED) {
		if (usX2Y->format != runtime->format)
			if ((err = usX2Y_format_set(usX2Y, runtime->format)) < 0)
				goto up_prepare_mutex;
		if (usX2Y->rate != runtime->rate)
			if ((err = usX2Y_rate_set(usX2Y, runtime->rate)) < 0)
				goto up_prepare_mutex;
		snd_printdd("starting capture pipe for %s\n", subs == capsubs ? "self" : "playpipe");
		if (0 > (err = usX2Y_urbs_start(capsubs)))
			goto up_prepare_mutex;
	}

	if (subs != capsubs && atomic_read(&subs->state) < state_PREPARED)
		err = usX2Y_urbs_start(subs);

 up_prepare_mutex:
	up(&usX2Y->prepare_mutex);
	return err;
}

static snd_pcm_hardware_t snd_usX2Y_2c =
{
	.info =			(SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_INTERLEAVED |
				 SNDRV_PCM_INFO_BLOCK_TRANSFER |
				 SNDRV_PCM_INFO_MMAP_VALID),
	.formats =                 SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S24_3LE,
	.rates =                   SNDRV_PCM_RATE_44100 | SNDRV_PCM_RATE_48000,
	.rate_min =                44100,
	.rate_max =                48000,
	.channels_min =            2,
	.channels_max =            2,
	.buffer_bytes_max =	(2*128*1024),
	.period_bytes_min =	64,
	.period_bytes_max =	(128*1024),
	.periods_min =		2,
	.periods_max =		1024,
	.fifo_size =              0
};



static int snd_usX2Y_pcm_open(snd_pcm_substream_t *substream)
{
	snd_usX2Y_substream_t	*subs = ((snd_usX2Y_substream_t **)
					 snd_pcm_substream_chip(substream))[substream->stream];
	snd_pcm_runtime_t	*runtime = substream->runtime;

	if (subs->usX2Y->chip_status & USX2Y_STAT_CHIP_MMAP_PCM_URBS)
		return -EBUSY;

	runtime->hw = snd_usX2Y_2c;
	runtime->private_data = subs;
	subs->pcm_substream = substream;
	snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIOD_TIME, 1000, 200000);
	return 0;
}



static int snd_usX2Y_pcm_close(snd_pcm_substream_t *substream)
{
	snd_pcm_runtime_t *runtime = substream->runtime;
	snd_usX2Y_substream_t *subs = (snd_usX2Y_substream_t *)runtime->private_data;
	int err = 0;

	subs->pcm_substream = NULL;

	return err;
}


static snd_pcm_ops_t snd_usX2Y_pcm_ops = 
{
	.open =		snd_usX2Y_pcm_open,
	.close =	snd_usX2Y_pcm_close,
	.ioctl =	snd_pcm_lib_ioctl,
	.hw_params =	snd_usX2Y_pcm_hw_params,
	.hw_free =	snd_usX2Y_pcm_hw_free,
	.prepare =	snd_usX2Y_pcm_prepare,
	.trigger =	snd_usX2Y_pcm_trigger,
	.pointer =	snd_usX2Y_pcm_pointer,
};


/*
 * free a usb stream instance
 */
static void usX2Y_audio_stream_free(snd_usX2Y_substream_t **usX2Y_substream)
{
	if (NULL != usX2Y_substream[SNDRV_PCM_STREAM_PLAYBACK]) {
		kfree(usX2Y_substream[SNDRV_PCM_STREAM_PLAYBACK]);
		usX2Y_substream[SNDRV_PCM_STREAM_PLAYBACK] = NULL;
	}
	kfree(usX2Y_substream[SNDRV_PCM_STREAM_CAPTURE]);
	usX2Y_substream[SNDRV_PCM_STREAM_CAPTURE] = NULL;
}

static void snd_usX2Y_pcm_private_free(snd_pcm_t *pcm)
{
	snd_usX2Y_substream_t **usX2Y_stream = pcm->private_data;
	if (usX2Y_stream)
		usX2Y_audio_stream_free(usX2Y_stream);
}

static int usX2Y_audio_stream_new(snd_card_t *card, int playback_endpoint, int capture_endpoint)
{
	snd_pcm_t *pcm;
	int err, i;
	snd_usX2Y_substream_t **usX2Y_substream =
		usX2Y(card)->subs + 2 * usX2Y(card)->chip.pcm_devs;

	for (i = playback_endpoint ? SNDRV_PCM_STREAM_PLAYBACK : SNDRV_PCM_STREAM_CAPTURE;
	     i <= SNDRV_PCM_STREAM_CAPTURE; ++i) {
		usX2Y_substream[i] = kzalloc(sizeof(snd_usX2Y_substream_t), GFP_KERNEL);
		if (NULL == usX2Y_substream[i]) {
			snd_printk(KERN_ERR "cannot malloc\n");
			return -ENOMEM;
		}
		usX2Y_substream[i]->usX2Y = usX2Y(card);
	}

	if (playback_endpoint)
		usX2Y_substream[SNDRV_PCM_STREAM_PLAYBACK]->endpoint = playback_endpoint;
	usX2Y_substream[SNDRV_PCM_STREAM_CAPTURE]->endpoint = capture_endpoint;

	err = snd_pcm_new(card, NAME_ALLCAPS" Audio", usX2Y(card)->chip.pcm_devs,
			  playback_endpoint ? 1 : 0, 1,
			  &pcm);
	if (err < 0) {
		usX2Y_audio_stream_free(usX2Y_substream);
		return err;
	}

	if (playback_endpoint)
		snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &snd_usX2Y_pcm_ops);
	snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &snd_usX2Y_pcm_ops);

	pcm->private_data = usX2Y_substream;
	pcm->private_free = snd_usX2Y_pcm_private_free;
	pcm->info_flags = 0;

	sprintf(pcm->name, NAME_ALLCAPS" Audio #%d", usX2Y(card)->chip.pcm_devs);

	if ((playback_endpoint &&
	     0 > (err = snd_pcm_lib_preallocate_pages(pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream,
						     SNDRV_DMA_TYPE_CONTINUOUS,
						     snd_dma_continuous_data(GFP_KERNEL),
						     64*1024, 128*1024))) ||
	    0 > (err = snd_pcm_lib_preallocate_pages(pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream,
	    					     SNDRV_DMA_TYPE_CONTINUOUS,
	    					     snd_dma_continuous_data(GFP_KERNEL),
						     64*1024, 128*1024))) {
		snd_usX2Y_pcm_private_free(pcm);
		return err;
	}
	usX2Y(card)->chip.pcm_devs++;

	return 0;
}

/*
 * create a chip instance and set its names.
 */
int usX2Y_audio_create(snd_card_t* card)
{
	int err = 0;
	
	INIT_LIST_HEAD(&usX2Y(card)->chip.pcm_list);

	if (0 > (err = usX2Y_audio_stream_new(card, 0xA, 0x8)))
		return err;
	if (le16_to_cpu(usX2Y(card)->chip.dev->descriptor.idProduct) == USB_ID_US428)
	     if (0 > (err = usX2Y_audio_stream_new(card, 0, 0xA)))
		     return err;
	if (le16_to_cpu(usX2Y(card)->chip.dev->descriptor.idProduct) != USB_ID_US122)
		err = usX2Y_rate_set(usX2Y(card), 44100);	// Lets us428 recognize output-volume settings, disturbs us122.
	return err;
}