summaryrefslogtreecommitdiffstats
path: root/sound/usb/pcm.c
blob: 5844a0c9d0dbd99579fa461c299a62b070395bb3 (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
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388
1389
1390
1391
1392
1393
1394
1395
1396
1397
1398
1399
1400
1401
1402
1403
1404
1405
1406
1407
1408
1409
1410
1411
1412
1413
1414
1415
1416
1417
1418
1419
1420
1421
1422
1423
1424
1425
1426
1427
1428
1429
1430
1431
1432
1433
1434
1435
1436
1437
1438
1439
1440
1441
1442
1443
1444
1445
1446
1447
1448
1449
1450
1451
1452
1453
1454
1455
1456
1457
1458
1459
1460
1461
1462
1463
1464
1465
1466
1467
1468
1469
1470
1471
1472
1473
1474
1475
1476
1477
1478
1479
1480
1481
1482
1483
1484
1485
1486
1487
1488
1489
1490
1491
1492
1493
1494
1495
1496
1497
1498
1499
1500
1501
1502
1503
1504
1505
1506
1507
1508
1509
1510
1511
1512
1513
1514
1515
1516
1517
1518
1519
1520
1521
1522
1523
1524
1525
1526
1527
1528
1529
1530
1531
1532
1533
1534
1535
1536
1537
1538
1539
1540
1541
1542
1543
1544
1545
1546
1547
1548
1549
1550
1551
1552
1553
1554
1555
1556
1557
1558
1559
1560
1561
1562
1563
1564
1565
1566
1567
1568
1569
1570
1571
1572
1573
1574
1575
1576
1577
1578
1579
1580
1581
1582
1583
1584
1585
1586
1587
1588
1589
1590
1591
1592
1593
1594
1595
1596
1597
1598
1599
1600
1601
1602
1603
1604
1605
1606
1607
1608
1609
1610
1611
1612
1613
1614
1615
1616
1617
1618
1619
1620
1621
1622
1623
1624
1625
1626
1627
1628
1629
1630
1631
1632
1633
1634
1635
1636
1637
1638
1639
1640
1641
1642
1643
1644
1645
1646
1647
1648
1649
1650
1651
1652
1653
1654
1655
1656
1657
1658
1659
1660
1661
1662
1663
1664
1665
1666
1667
1668
1669
1670
1671
1672
1673
1674
1675
1676
1677
1678
1679
1680
1681
1682
1683
1684
1685
1686
1687
1688
1689
1690
1691
1692
1693
1694
1695
1696
1697
1698
1699
1700
1701
1702
1703
1704
1705
1706
1707
1708
1709
1710
1711
1712
1713
1714
1715
1716
1717
1718
1719
1720
1721
1722
1723
1724
1725
1726
1727
1728
1729
1730
1731
1732
1733
1734
1735
1736
1737
1738
1739
1740
1741
1742
1743
1744
1745
1746
1747
1748
1749
1750
1751
1752
1753
1754
1755
1756
1757
1758
1759
1760
1761
1762
1763
1764
1765
1766
1767
1768
1769
1770
1771
1772
1773
1774
1775
1776
1777
1778
1779
1780
1781
1782
1783
1784
1785
1786
1787
1788
1789
1790
1791
1792
1793
1794
1795
1796
1797
1798
1799
1800
1801
1802
1803
1804
1805
1806
1807
1808
1809
1810
1811
1812
1813
1814
1815
1816
1817
1818
1819
1820
1821
1822
1823
1824
1825
1826
1827
1828
1829
1830
1831
1832
1833
1834
1835
1836
1837
1838
// SPDX-License-Identifier: GPL-2.0-or-later
/*
 */

#include <linux/init.h>
#include <linux/slab.h>
#include <linux/bitrev.h>
#include <linux/ratelimit.h>
#include <linux/usb.h>
#include <linux/usb/audio.h>
#include <linux/usb/audio-v2.h>

#include <sound/core.h>
#include <sound/pcm.h>
#include <sound/pcm_params.h>

#include "usbaudio.h"
#include "card.h"
#include "quirks.h"
#include "debug.h"
#include "endpoint.h"
#include "helper.h"
#include "pcm.h"
#include "clock.h"
#include "power.h"
#include "media.h"

#define SUBSTREAM_FLAG_DATA_EP_STARTED	0
#define SUBSTREAM_FLAG_SYNC_EP_STARTED	1

/* return the estimated delay based on USB frame counters */
snd_pcm_uframes_t snd_usb_pcm_delay(struct snd_usb_substream *subs,
				    unsigned int rate)
{
	int current_frame_number;
	int frame_diff;
	int est_delay;

	if (!subs->last_delay)
		return 0; /* short path */

	current_frame_number = usb_get_current_frame_number(subs->dev);
	/*
	 * HCD implementations use different widths, use lower 8 bits.
	 * The delay will be managed up to 256ms, which is more than
	 * enough
	 */
	frame_diff = (current_frame_number - subs->last_frame_number) & 0xff;

	/* Approximation based on number of samples per USB frame (ms),
	   some truncation for 44.1 but the estimate is good enough */
	est_delay =  frame_diff * rate / 1000;
	if (subs->direction == SNDRV_PCM_STREAM_PLAYBACK)
		est_delay = subs->last_delay - est_delay;
	else
		est_delay = subs->last_delay + est_delay;

	if (est_delay < 0)
		est_delay = 0;
	return est_delay;
}

/*
 * return the current pcm pointer.  just based on the hwptr_done value.
 */
static snd_pcm_uframes_t snd_usb_pcm_pointer(struct snd_pcm_substream *substream)
{
	struct snd_usb_substream *subs = substream->runtime->private_data;
	unsigned int hwptr_done;

	if (atomic_read(&subs->stream->chip->shutdown))
		return SNDRV_PCM_POS_XRUN;
	spin_lock(&subs->lock);
	hwptr_done = subs->hwptr_done;
	substream->runtime->delay = snd_usb_pcm_delay(subs,
						substream->runtime->rate);
	spin_unlock(&subs->lock);
	return hwptr_done / (substream->runtime->frame_bits >> 3);
}

/*
 * find a matching audio format
 */
static struct audioformat *find_format(struct snd_usb_substream *subs)
{
	struct audioformat *fp;
	struct audioformat *found = NULL;
	int cur_attr = 0, attr;

	list_for_each_entry(fp, &subs->fmt_list, list) {
		if (!(fp->formats & pcm_format_to_bits(subs->pcm_format)))
			continue;
		if (fp->channels != subs->channels)
			continue;
		if (subs->cur_rate < fp->rate_min ||
		    subs->cur_rate > fp->rate_max)
			continue;
		if (! (fp->rates & SNDRV_PCM_RATE_CONTINUOUS)) {
			unsigned int i;
			for (i = 0; i < fp->nr_rates; i++)
				if (fp->rate_table[i] == subs->cur_rate)
					break;
			if (i >= fp->nr_rates)
				continue;
		}
		attr = fp->ep_attr & USB_ENDPOINT_SYNCTYPE;
		if (! found) {
			found = fp;
			cur_attr = attr;
			continue;
		}
		/* avoid async out and adaptive in if the other method
		 * supports the same format.
		 * this is a workaround for the case like
		 * M-audio audiophile USB.
		 */
		if (attr != cur_attr) {
			if ((attr == USB_ENDPOINT_SYNC_ASYNC &&
			     subs->direction == SNDRV_PCM_STREAM_PLAYBACK) ||
			    (attr == USB_ENDPOINT_SYNC_ADAPTIVE &&
			     subs->direction == SNDRV_PCM_STREAM_CAPTURE))
				continue;
			if ((cur_attr == USB_ENDPOINT_SYNC_ASYNC &&
			     subs->direction == SNDRV_PCM_STREAM_PLAYBACK) ||
			    (cur_attr == USB_ENDPOINT_SYNC_ADAPTIVE &&
			     subs->direction == SNDRV_PCM_STREAM_CAPTURE)) {
				found = fp;
				cur_attr = attr;
				continue;
			}
		}
		/* find the format with the largest max. packet size */
		if (fp->maxpacksize > found->maxpacksize) {
			found = fp;
			cur_attr = attr;
		}
	}
	return found;
}

static int init_pitch_v1(struct snd_usb_audio *chip, int iface,
			 struct usb_host_interface *alts,
			 struct audioformat *fmt)
{
	struct usb_device *dev = chip->dev;
	unsigned int ep;
	unsigned char data[1];
	int err;

	if (get_iface_desc(alts)->bNumEndpoints < 1)
		return -EINVAL;
	ep = get_endpoint(alts, 0)->bEndpointAddress;

	data[0] = 1;
	err = snd_usb_ctl_msg(dev, usb_sndctrlpipe(dev, 0), UAC_SET_CUR,
			      USB_TYPE_CLASS|USB_RECIP_ENDPOINT|USB_DIR_OUT,
			      UAC_EP_CS_ATTR_PITCH_CONTROL << 8, ep,
			      data, sizeof(data));
	if (err < 0) {
		usb_audio_err(chip, "%d:%d: cannot set enable PITCH\n",
			      iface, ep);
		return err;
	}

	return 0;
}

static int init_pitch_v2(struct snd_usb_audio *chip, int iface,
			 struct usb_host_interface *alts,
			 struct audioformat *fmt)
{
	struct usb_device *dev = chip->dev;
	unsigned char data[1];
	int err;

	data[0] = 1;
	err = snd_usb_ctl_msg(dev, usb_sndctrlpipe(dev, 0), UAC2_CS_CUR,
			      USB_TYPE_CLASS | USB_RECIP_ENDPOINT | USB_DIR_OUT,
			      UAC2_EP_CS_PITCH << 8, 0,
			      data, sizeof(data));
	if (err < 0) {
		usb_audio_err(chip, "%d:%d: cannot set enable PITCH (v2)\n",
			      iface, fmt->altsetting);
		return err;
	}

	return 0;
}

/*
 * initialize the pitch control and sample rate
 */
int snd_usb_init_pitch(struct snd_usb_audio *chip, int iface,
		       struct usb_host_interface *alts,
		       struct audioformat *fmt)
{
	/* if endpoint doesn't have pitch control, bail out */
	if (!(fmt->attributes & UAC_EP_CS_ATTR_PITCH_CONTROL))
		return 0;

	switch (fmt->protocol) {
	case UAC_VERSION_1:
	default:
		return init_pitch_v1(chip, iface, alts, fmt);

	case UAC_VERSION_2:
		return init_pitch_v2(chip, iface, alts, fmt);
	}
}

static int start_endpoints(struct snd_usb_substream *subs)
{
	int err;

	if (!subs->data_endpoint)
		return -EINVAL;

	if (!test_and_set_bit(SUBSTREAM_FLAG_DATA_EP_STARTED, &subs->flags)) {
		struct snd_usb_endpoint *ep = subs->data_endpoint;

		dev_dbg(&subs->dev->dev, "Starting data EP @%p\n", ep);

		ep->data_subs = subs;
		err = snd_usb_endpoint_start(ep);
		if (err < 0) {
			clear_bit(SUBSTREAM_FLAG_DATA_EP_STARTED, &subs->flags);
			return err;
		}
	}

	if (subs->sync_endpoint &&
	    !test_and_set_bit(SUBSTREAM_FLAG_SYNC_EP_STARTED, &subs->flags)) {
		struct snd_usb_endpoint *ep = subs->sync_endpoint;

		if (subs->data_endpoint->iface != subs->sync_endpoint->iface ||
		    subs->data_endpoint->altsetting != subs->sync_endpoint->altsetting) {
			err = usb_set_interface(subs->dev,
						subs->sync_endpoint->iface,
						subs->sync_endpoint->altsetting);
			if (err < 0) {
				clear_bit(SUBSTREAM_FLAG_SYNC_EP_STARTED, &subs->flags);
				dev_err(&subs->dev->dev,
					   "%d:%d: cannot set interface (%d)\n",
					   subs->sync_endpoint->iface,
					   subs->sync_endpoint->altsetting, err);
				return -EIO;
			}
		}

		dev_dbg(&subs->dev->dev, "Starting sync EP @%p\n", ep);

		ep->sync_slave = subs->data_endpoint;
		err = snd_usb_endpoint_start(ep);
		if (err < 0) {
			clear_bit(SUBSTREAM_FLAG_SYNC_EP_STARTED, &subs->flags);
			return err;
		}
	}

	return 0;
}

static void sync_pending_stops(struct snd_usb_substream *subs)
{
	snd_usb_endpoint_sync_pending_stop(subs->sync_endpoint);
	snd_usb_endpoint_sync_pending_stop(subs->data_endpoint);
}

static void stop_endpoints(struct snd_usb_substream *subs)
{
	if (test_and_clear_bit(SUBSTREAM_FLAG_SYNC_EP_STARTED, &subs->flags))
		snd_usb_endpoint_stop(subs->sync_endpoint);

	if (test_and_clear_bit(SUBSTREAM_FLAG_DATA_EP_STARTED, &subs->flags))
		snd_usb_endpoint_stop(subs->data_endpoint);
}

/* PCM sync_stop callback */
static int snd_usb_pcm_sync_stop(struct snd_pcm_substream *substream)
{
	struct snd_usb_substream *subs = substream->runtime->private_data;

	if (!snd_usb_lock_shutdown(subs->stream->chip)) {
		sync_pending_stops(subs);
		snd_usb_unlock_shutdown(subs->stream->chip);
	}
	return 0;
}

static int search_roland_implicit_fb(struct usb_device *dev, int ifnum,
				     unsigned int altsetting,
				     struct usb_host_interface **alts,
				     unsigned int *ep)
{
	struct usb_interface *iface;
	struct usb_interface_descriptor *altsd;
	struct usb_endpoint_descriptor *epd;

	iface = usb_ifnum_to_if(dev, ifnum);
	if (!iface || iface->num_altsetting < altsetting + 1)
		return -ENOENT;
	*alts = &iface->altsetting[altsetting];
	altsd = get_iface_desc(*alts);
	if (altsd->bAlternateSetting != altsetting ||
	    altsd->bInterfaceClass != USB_CLASS_VENDOR_SPEC ||
	    (altsd->bInterfaceSubClass != 2 &&
	     altsd->bInterfaceProtocol != 2   ) ||
	    altsd->bNumEndpoints < 1)
		return -ENOENT;
	epd = get_endpoint(*alts, 0);
	if (!usb_endpoint_is_isoc_in(epd) ||
	    (epd->bmAttributes & USB_ENDPOINT_USAGE_MASK) !=
					USB_ENDPOINT_USAGE_IMPLICIT_FB)
		return -ENOENT;
	*ep = epd->bEndpointAddress;
	return 0;
}

/* Setup an implicit feedback endpoint from a quirk. Returns 0 if no quirk
 * applies. Returns 1 if a quirk was found.
 */
static int set_sync_ep_implicit_fb_quirk(struct snd_usb_substream *subs,
					 struct usb_device *dev,
					 struct usb_interface_descriptor *altsd,
					 unsigned int attr)
{
	struct usb_host_interface *alts;
	struct usb_interface *iface;
	unsigned int ep;
	unsigned int ifnum;

	/* Implicit feedback sync EPs consumers are always playback EPs */
	if (subs->direction != SNDRV_PCM_STREAM_PLAYBACK)
		return 0;

	switch (subs->stream->chip->usb_id) {
	case USB_ID(0x0763, 0x2030): /* M-Audio Fast Track C400 */
	case USB_ID(0x0763, 0x2031): /* M-Audio Fast Track C600 */
		ep = 0x81;
		ifnum = 3;
		goto add_sync_ep_from_ifnum;
	case USB_ID(0x0763, 0x2080): /* M-Audio FastTrack Ultra */
	case USB_ID(0x0763, 0x2081):
		ep = 0x81;
		ifnum = 2;
		goto add_sync_ep_from_ifnum;
	case USB_ID(0x2466, 0x8003): /* Fractal Audio Axe-Fx II */
		ep = 0x86;
		ifnum = 2;
		goto add_sync_ep_from_ifnum;
	case USB_ID(0x2466, 0x8010): /* Fractal Audio Axe-Fx III */
		ep = 0x81;
		ifnum = 2;
		goto add_sync_ep_from_ifnum;
	case USB_ID(0x1397, 0x0001): /* Behringer UFX1604 */
	case USB_ID(0x1397, 0x0002): /* Behringer UFX1204 */
		ep = 0x81;
		ifnum = 1;
		goto add_sync_ep_from_ifnum;
	case USB_ID(0x07fd, 0x0004): /* MOTU MicroBook II */
		ep = 0x84;
		ifnum = 0;
		goto add_sync_ep_from_ifnum;
	case USB_ID(0x07fd, 0x0008): /* MOTU M Series */
		ep = 0x81;
		ifnum = 2;
		goto add_sync_ep_from_ifnum;
	case USB_ID(0x0582, 0x01d8): /* BOSS Katana */
		/* BOSS Katana amplifiers do not need quirks */
		return 0;
	}

	if (attr == USB_ENDPOINT_SYNC_ASYNC &&
	    altsd->bInterfaceClass == USB_CLASS_VENDOR_SPEC &&
	    altsd->bInterfaceProtocol == 2 &&
	    altsd->bNumEndpoints == 1 &&
	    USB_ID_VENDOR(subs->stream->chip->usb_id) == 0x0582 /* Roland */ &&
	    search_roland_implicit_fb(dev, altsd->bInterfaceNumber + 1,
				      altsd->bAlternateSetting,
				      &alts, &ep) >= 0) {
		goto add_sync_ep;
	}

	/* No quirk */
	return 0;

add_sync_ep_from_ifnum:
	iface = usb_ifnum_to_if(dev, ifnum);

	if (!iface || iface->num_altsetting == 0)
		return -EINVAL;

	alts = &iface->altsetting[1];

add_sync_ep:
	subs->sync_endpoint = snd_usb_add_endpoint(subs->stream->chip,
						   alts, ep, !subs->direction,
						   SND_USB_ENDPOINT_TYPE_DATA);
	if (!subs->sync_endpoint)
		return -EINVAL;

	subs->data_endpoint->sync_master = subs->sync_endpoint;

	return 1;
}

static int set_sync_endpoint(struct snd_usb_substream *subs,
			     struct audioformat *fmt,
			     struct usb_device *dev,
			     struct usb_host_interface *alts,
			     struct usb_interface_descriptor *altsd)
{
	int is_playback = subs->direction == SNDRV_PCM_STREAM_PLAYBACK;
	unsigned int ep, attr;
	bool implicit_fb;
	int err;

	/* we need a sync pipe in async OUT or adaptive IN mode */
	/* check the number of EP, since some devices have broken
	 * descriptors which fool us.  if it has only one EP,
	 * assume it as adaptive-out or sync-in.
	 */
	attr = fmt->ep_attr & USB_ENDPOINT_SYNCTYPE;

	if ((is_playback && (attr != USB_ENDPOINT_SYNC_ASYNC)) ||
		(!is_playback && (attr != USB_ENDPOINT_SYNC_ADAPTIVE))) {

		/*
		 * In these modes the notion of sync_endpoint is irrelevant.
		 * Reset pointers to avoid using stale data from previously
		 * used settings, e.g. when configuration and endpoints were
		 * changed
		 */

		subs->sync_endpoint = NULL;
		subs->data_endpoint->sync_master = NULL;
	}

	err = set_sync_ep_implicit_fb_quirk(subs, dev, altsd, attr);
	if (err < 0)
		return err;

	/* endpoint set by quirk */
	if (err > 0)
		return 0;

	if (altsd->bNumEndpoints < 2)
		return 0;

	if ((is_playback && (attr == USB_ENDPOINT_SYNC_SYNC ||
			     attr == USB_ENDPOINT_SYNC_ADAPTIVE)) ||
	    (!is_playback && attr != USB_ENDPOINT_SYNC_ADAPTIVE))
		return 0;

	/*
	 * In case of illegal SYNC_NONE for OUT endpoint, we keep going to see
	 * if we don't find a sync endpoint, as on M-Audio Transit. In case of
	 * error fall back to SYNC mode and don't create sync endpoint
	 */

	/* check sync-pipe endpoint */
	/* ... and check descriptor size before accessing bSynchAddress
	   because there is a version of the SB Audigy 2 NX firmware lacking
	   the audio fields in the endpoint descriptors */
	if ((get_endpoint(alts, 1)->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) != USB_ENDPOINT_XFER_ISOC ||
	    (get_endpoint(alts, 1)->bLength >= USB_DT_ENDPOINT_AUDIO_SIZE &&
	     get_endpoint(alts, 1)->bSynchAddress != 0)) {
		dev_err(&dev->dev,
			"%d:%d : invalid sync pipe. bmAttributes %02x, bLength %d, bSynchAddress %02x\n",
			   fmt->iface, fmt->altsetting,
			   get_endpoint(alts, 1)->bmAttributes,
			   get_endpoint(alts, 1)->bLength,
			   get_endpoint(alts, 1)->bSynchAddress);
		if (is_playback && attr == USB_ENDPOINT_SYNC_NONE)
			return 0;
		return -EINVAL;
	}
	ep = get_endpoint(alts, 1)->bEndpointAddress;
	if (get_endpoint(alts, 0)->bLength >= USB_DT_ENDPOINT_AUDIO_SIZE &&
	    get_endpoint(alts, 0)->bSynchAddress != 0 &&
	    ((is_playback && ep != (unsigned int)(get_endpoint(alts, 0)->bSynchAddress | USB_DIR_IN)) ||
	     (!is_playback && ep != (unsigned int)(get_endpoint(alts, 0)->bSynchAddress & ~USB_DIR_IN)))) {
		dev_err(&dev->dev,
			"%d:%d : invalid sync pipe. is_playback %d, ep %02x, bSynchAddress %02x\n",
			   fmt->iface, fmt->altsetting,
			   is_playback, ep, get_endpoint(alts, 0)->bSynchAddress);
		if (is_playback && attr == USB_ENDPOINT_SYNC_NONE)
			return 0;
		return -EINVAL;
	}

	implicit_fb = (get_endpoint(alts, 1)->bmAttributes & USB_ENDPOINT_USAGE_MASK)
			== USB_ENDPOINT_USAGE_IMPLICIT_FB;

	subs->sync_endpoint = snd_usb_add_endpoint(subs->stream->chip,
						   alts, ep, !subs->direction,
						   implicit_fb ?
							SND_USB_ENDPOINT_TYPE_DATA :
							SND_USB_ENDPOINT_TYPE_SYNC);
	if (!subs->sync_endpoint) {
		if (is_playback && attr == USB_ENDPOINT_SYNC_NONE)
			return 0;
		return -EINVAL;
	}

	subs->data_endpoint->sync_master = subs->sync_endpoint;

	return 0;
}

/*
 * find a matching format and set up the interface
 */
static int set_format(struct snd_usb_substream *subs, struct audioformat *fmt)
{
	struct usb_device *dev = subs->dev;
	struct usb_host_interface *alts;
	struct usb_interface_descriptor *altsd;
	struct usb_interface *iface;
	int err;

	iface = usb_ifnum_to_if(dev, fmt->iface);
	if (WARN_ON(!iface))
		return -EINVAL;
	alts = usb_altnum_to_altsetting(iface, fmt->altsetting);
	if (WARN_ON(!alts))
		return -EINVAL;
	altsd = get_iface_desc(alts);

	if (fmt == subs->cur_audiofmt && !subs->need_setup_fmt)
		return 0;

	/* close the old interface */
	if (subs->interface >= 0 && (subs->interface != fmt->iface || subs->need_setup_fmt)) {
		if (!subs->stream->chip->keep_iface) {
			err = usb_set_interface(subs->dev, subs->interface, 0);
			if (err < 0) {
				dev_err(&dev->dev,
					"%d:%d: return to setting 0 failed (%d)\n",
					fmt->iface, fmt->altsetting, err);
				return -EIO;
			}
		}
		subs->interface = -1;
		subs->altset_idx = 0;
	}

	if (subs->need_setup_fmt)
		subs->need_setup_fmt = false;

	/* set interface */
	if (iface->cur_altsetting != alts) {
		err = snd_usb_select_mode_quirk(subs, fmt);
		if (err < 0)
			return -EIO;

		err = usb_set_interface(dev, fmt->iface, fmt->altsetting);
		if (err < 0) {
			dev_err(&dev->dev,
				"%d:%d: usb_set_interface failed (%d)\n",
				fmt->iface, fmt->altsetting, err);
			return -EIO;
		}
		dev_dbg(&dev->dev, "setting usb interface %d:%d\n",
			fmt->iface, fmt->altsetting);
		snd_usb_set_interface_quirk(dev);
	}

	subs->interface = fmt->iface;
	subs->altset_idx = fmt->altset_idx;
	subs->data_endpoint = snd_usb_add_endpoint(subs->stream->chip,
						   alts, fmt->endpoint, subs->direction,
						   SND_USB_ENDPOINT_TYPE_DATA);

	if (!subs->data_endpoint)
		return -EINVAL;

	err = set_sync_endpoint(subs, fmt, dev, alts, altsd);
	if (err < 0)
		return err;

	err = snd_usb_init_pitch(subs->stream->chip, fmt->iface, alts, fmt);
	if (err < 0)
		return err;

	subs->cur_audiofmt = fmt;

	snd_usb_set_format_quirk(subs, fmt);

	return 0;
}

/*
 * Return the score of matching two audioformats.
 * Veto the audioformat if:
 * - It has no channels for some reason.
 * - Requested PCM format is not supported.
 * - Requested sample rate is not supported.
 */
static int match_endpoint_audioformats(struct snd_usb_substream *subs,
				       struct audioformat *fp,
				       struct audioformat *match, int rate,
				       snd_pcm_format_t pcm_format)
{
	int i;
	int score = 0;

	if (fp->channels < 1) {
		dev_dbg(&subs->dev->dev,
			"%s: (fmt @%p) no channels\n", __func__, fp);
		return 0;
	}

	if (!(fp->formats & pcm_format_to_bits(pcm_format))) {
		dev_dbg(&subs->dev->dev,
			"%s: (fmt @%p) no match for format %d\n", __func__,
			fp, pcm_format);
		return 0;
	}

	for (i = 0; i < fp->nr_rates; i++) {
		if (fp->rate_table[i] == rate) {
			score++;
			break;
		}
	}
	if (!score) {
		dev_dbg(&subs->dev->dev,
			"%s: (fmt @%p) no match for rate %d\n", __func__,
			fp, rate);
		return 0;
	}

	if (fp->channels == match->channels)
		score++;

	dev_dbg(&subs->dev->dev,
		"%s: (fmt @%p) score %d\n", __func__, fp, score);

	return score;
}

/*
 * Configure the sync ep using the rate and pcm format of the data ep.
 */
static int configure_sync_endpoint(struct snd_usb_substream *subs)
{
	int ret;
	struct audioformat *fp;
	struct audioformat *sync_fp = NULL;
	int cur_score = 0;
	int sync_period_bytes = subs->period_bytes;
	struct snd_usb_substream *sync_subs =
		&subs->stream->substream[subs->direction ^ 1];

	if (subs->sync_endpoint->type != SND_USB_ENDPOINT_TYPE_DATA ||
	    !subs->stream)
		return snd_usb_endpoint_set_params(subs->sync_endpoint,
						   subs->pcm_format,
						   subs->channels,
						   subs->period_bytes,
						   0, 0,
						   subs->cur_rate,
						   subs->cur_audiofmt,
						   NULL);

	/* Try to find the best matching audioformat. */
	list_for_each_entry(fp, &sync_subs->fmt_list, list) {
		int score = match_endpoint_audioformats(subs,
							fp, subs->cur_audiofmt,
			subs->cur_rate, subs->pcm_format);

		if (score > cur_score) {
			sync_fp = fp;
			cur_score = score;
		}
	}

	if (unlikely(sync_fp == NULL)) {
		dev_err(&subs->dev->dev,
			"%s: no valid audioformat for sync ep %x found\n",
			__func__, sync_subs->ep_num);
		return -EINVAL;
	}

	/*
	 * Recalculate the period bytes if channel number differ between
	 * data and sync ep audioformat.
	 */
	if (sync_fp->channels != subs->channels) {
		sync_period_bytes = (subs->period_bytes / subs->channels) *
			sync_fp->channels;
		dev_dbg(&subs->dev->dev,
			"%s: adjusted sync ep period bytes (%d -> %d)\n",
			__func__, subs->period_bytes, sync_period_bytes);
	}

	ret = snd_usb_endpoint_set_params(subs->sync_endpoint,
					  subs->pcm_format,
					  sync_fp->channels,
					  sync_period_bytes,
					  0, 0,
					  subs->cur_rate,
					  sync_fp,
					  NULL);

	return ret;
}

/*
 * configure endpoint params
 *
 * called  during initial setup and upon resume
 */
static int configure_endpoint(struct snd_usb_substream *subs)
{
	int ret;

	/* format changed */
	stop_endpoints(subs);
	sync_pending_stops(subs);
	ret = snd_usb_endpoint_set_params(subs->data_endpoint,
					  subs->pcm_format,
					  subs->channels,
					  subs->period_bytes,
					  subs->period_frames,
					  subs->buffer_periods,
					  subs->cur_rate,
					  subs->cur_audiofmt,
					  subs->sync_endpoint);
	if (ret < 0)
		return ret;

	if (subs->sync_endpoint)
		ret = configure_sync_endpoint(subs);

	return ret;
}

static int snd_usb_pcm_change_state(struct snd_usb_substream *subs, int state)
{
	int ret;

	if (!subs->str_pd)
		return 0;

	ret = snd_usb_power_domain_set(subs->stream->chip, subs->str_pd, state);
	if (ret < 0) {
		dev_err(&subs->dev->dev,
			"Cannot change Power Domain ID: %d to state: %d. Err: %d\n",
			subs->str_pd->pd_id, state, ret);
		return ret;
	}

	return 0;
}

int snd_usb_pcm_suspend(struct snd_usb_stream *as)
{
	int ret;

	ret = snd_usb_pcm_change_state(&as->substream[0], UAC3_PD_STATE_D2);
	if (ret < 0)
		return ret;

	ret = snd_usb_pcm_change_state(&as->substream[1], UAC3_PD_STATE_D2);
	if (ret < 0)
		return ret;

	return 0;
}

int snd_usb_pcm_resume(struct snd_usb_stream *as)
{
	int ret;

	ret = snd_usb_pcm_change_state(&as->substream[0], UAC3_PD_STATE_D1);
	if (ret < 0)
		return ret;

	ret = snd_usb_pcm_change_state(&as->substream[1], UAC3_PD_STATE_D1);
	if (ret < 0)
		return ret;

	return 0;
}

/*
 * hw_params callback
 *
 * allocate a buffer and set the given audio format.
 *
 * 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 int snd_usb_hw_params(struct snd_pcm_substream *substream,
			     struct snd_pcm_hw_params *hw_params)
{
	struct snd_usb_substream *subs = substream->runtime->private_data;
	struct audioformat *fmt;
	int ret;

	ret = snd_media_start_pipeline(subs);
	if (ret)
		return ret;

	subs->pcm_format = params_format(hw_params);
	subs->period_bytes = params_period_bytes(hw_params);
	subs->period_frames = params_period_size(hw_params);
	subs->buffer_periods = params_periods(hw_params);
	subs->channels = params_channels(hw_params);
	subs->cur_rate = params_rate(hw_params);

	fmt = find_format(subs);
	if (!fmt) {
		dev_dbg(&subs->dev->dev,
			"cannot set format: format = %#x, rate = %d, channels = %d\n",
			   subs->pcm_format, subs->cur_rate, subs->channels);
		ret = -EINVAL;
		goto stop_pipeline;
	}

	ret = snd_usb_lock_shutdown(subs->stream->chip);
	if (ret < 0)
		goto stop_pipeline;

	ret = snd_usb_pcm_change_state(subs, UAC3_PD_STATE_D0);
	if (ret < 0)
		goto unlock;

	ret = set_format(subs, fmt);
	if (ret < 0)
		goto unlock;

	subs->interface = fmt->iface;
	subs->altset_idx = fmt->altset_idx;
	subs->need_setup_ep = true;

 unlock:
	snd_usb_unlock_shutdown(subs->stream->chip);
	if (ret < 0)
		goto stop_pipeline;
	return ret;

 stop_pipeline:
	snd_media_stop_pipeline(subs);
	return ret;
}

/*
 * hw_free callback
 *
 * reset the audio format and release the buffer
 */
static int snd_usb_hw_free(struct snd_pcm_substream *substream)
{
	struct snd_usb_substream *subs = substream->runtime->private_data;

	snd_media_stop_pipeline(subs);
	subs->cur_audiofmt = NULL;
	subs->cur_rate = 0;
	subs->period_bytes = 0;
	if (!snd_usb_lock_shutdown(subs->stream->chip)) {
		stop_endpoints(subs);
		sync_pending_stops(subs);
		snd_usb_endpoint_deactivate(subs->sync_endpoint);
		snd_usb_endpoint_deactivate(subs->data_endpoint);
		snd_usb_unlock_shutdown(subs->stream->chip);
	}

	return 0;
}

/*
 * prepare callback
 *
 * only a few subtle things...
 */
static int snd_usb_pcm_prepare(struct snd_pcm_substream *substream)
{
	struct snd_pcm_runtime *runtime = substream->runtime;
	struct snd_usb_substream *subs = runtime->private_data;
	struct usb_host_interface *alts;
	struct usb_interface *iface;
	int ret;

	if (! subs->cur_audiofmt) {
		dev_err(&subs->dev->dev, "no format is specified!\n");
		return -ENXIO;
	}

	ret = snd_usb_lock_shutdown(subs->stream->chip);
	if (ret < 0)
		return ret;
	if (snd_BUG_ON(!subs->data_endpoint)) {
		ret = -EIO;
		goto unlock;
	}

	ret = snd_usb_pcm_change_state(subs, UAC3_PD_STATE_D0);
	if (ret < 0)
		goto unlock;

	ret = set_format(subs, subs->cur_audiofmt);
	if (ret < 0)
		goto unlock;

	if (subs->need_setup_ep) {

		iface = usb_ifnum_to_if(subs->dev, subs->cur_audiofmt->iface);
		alts = &iface->altsetting[subs->cur_audiofmt->altset_idx];
		ret = snd_usb_init_sample_rate(subs->stream->chip,
					       subs->cur_audiofmt->iface,
					       alts,
					       subs->cur_audiofmt,
					       subs->cur_rate);
		if (ret < 0)
			goto unlock;

		ret = configure_endpoint(subs);
		if (ret < 0)
			goto unlock;
		subs->need_setup_ep = false;
	}

	/* some unit conversions in runtime */
	subs->data_endpoint->maxframesize =
		bytes_to_frames(runtime, subs->data_endpoint->maxpacksize);
	subs->data_endpoint->curframesize =
		bytes_to_frames(runtime, subs->data_endpoint->curpacksize);

	/* reset the pointer */
	subs->hwptr_done = 0;
	subs->transfer_done = 0;
	subs->last_delay = 0;
	subs->last_frame_number = 0;
	runtime->delay = 0;

	/* for playback, submit the URBs now; otherwise, the first hwptr_done
	 * updates for all URBs would happen at the same time when starting */
	if (subs->direction == SNDRV_PCM_STREAM_PLAYBACK)
		ret = start_endpoints(subs);

 unlock:
	snd_usb_unlock_shutdown(subs->stream->chip);
	return ret;
}

static const struct snd_pcm_hardware snd_usb_hardware =
{
	.info =			SNDRV_PCM_INFO_MMAP |
				SNDRV_PCM_INFO_MMAP_VALID |
				SNDRV_PCM_INFO_BATCH |
				SNDRV_PCM_INFO_INTERLEAVED |
				SNDRV_PCM_INFO_BLOCK_TRANSFER |
				SNDRV_PCM_INFO_PAUSE,
	.buffer_bytes_max =	1024 * 1024,
	.period_bytes_min =	64,
	.period_bytes_max =	512 * 1024,
	.periods_min =		2,
	.periods_max =		1024,
};

static int hw_check_valid_format(struct snd_usb_substream *subs,
				 struct snd_pcm_hw_params *params,
				 struct audioformat *fp)
{
	struct snd_interval *it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE);
	struct snd_interval *ct = hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS);
	struct snd_mask *fmts = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);
	struct snd_interval *pt = hw_param_interval(params, SNDRV_PCM_HW_PARAM_PERIOD_TIME);
	struct snd_mask check_fmts;
	unsigned int ptime;

	/* check the format */
	snd_mask_none(&check_fmts);
	check_fmts.bits[0] = (u32)fp->formats;
	check_fmts.bits[1] = (u32)(fp->formats >> 32);
	snd_mask_intersect(&check_fmts, fmts);
	if (snd_mask_empty(&check_fmts)) {
		hwc_debug("   > check: no supported format %d\n", fp->format);
		return 0;
	}
	/* check the channels */
	if (fp->channels < ct->min || fp->channels > ct->max) {
		hwc_debug("   > check: no valid channels %d (%d/%d)\n", fp->channels, ct->min, ct->max);
		return 0;
	}
	/* check the rate is within the range */
	if (fp->rate_min > it->max || (fp->rate_min == it->max && it->openmax)) {
		hwc_debug("   > check: rate_min %d > max %d\n", fp->rate_min, it->max);
		return 0;
	}
	if (fp->rate_max < it->min || (fp->rate_max == it->min && it->openmin)) {
		hwc_debug("   > check: rate_max %d < min %d\n", fp->rate_max, it->min);
		return 0;
	}
	/* check whether the period time is >= the data packet interval */
	if (subs->speed != USB_SPEED_FULL) {
		ptime = 125 * (1 << fp->datainterval);
		if (ptime > pt->max || (ptime == pt->max && pt->openmax)) {
			hwc_debug("   > check: ptime %u > max %u\n", ptime, pt->max);
			return 0;
		}
	}
	return 1;
}

static int hw_rule_rate(struct snd_pcm_hw_params *params,
			struct snd_pcm_hw_rule *rule)
{
	struct snd_usb_substream *subs = rule->private;
	struct audioformat *fp;
	struct snd_interval *it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE);
	unsigned int rmin, rmax;
	int changed;

	hwc_debug("hw_rule_rate: (%d,%d)\n", it->min, it->max);
	changed = 0;
	rmin = rmax = 0;
	list_for_each_entry(fp, &subs->fmt_list, list) {
		if (!hw_check_valid_format(subs, params, fp))
			continue;
		if (changed++) {
			if (rmin > fp->rate_min)
				rmin = fp->rate_min;
			if (rmax < fp->rate_max)
				rmax = fp->rate_max;
		} else {
			rmin = fp->rate_min;
			rmax = fp->rate_max;
		}
	}

	if (!changed) {
		hwc_debug("  --> get empty\n");
		it->empty = 1;
		return -EINVAL;
	}

	changed = 0;
	if (it->min < rmin) {
		it->min = rmin;
		it->openmin = 0;
		changed = 1;
	}
	if (it->max > rmax) {
		it->max = rmax;
		it->openmax = 0;
		changed = 1;
	}
	if (snd_interval_checkempty(it)) {
		it->empty = 1;
		return -EINVAL;
	}
	hwc_debug("  --> (%d, %d) (changed = %d)\n", it->min, it->max, changed);
	return changed;
}


static int hw_rule_channels(struct snd_pcm_hw_params *params,
			    struct snd_pcm_hw_rule *rule)
{
	struct snd_usb_substream *subs = rule->private;
	struct audioformat *fp;
	struct snd_interval *it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS);
	unsigned int rmin, rmax;
	int changed;

	hwc_debug("hw_rule_channels: (%d,%d)\n", it->min, it->max);
	changed = 0;
	rmin = rmax = 0;
	list_for_each_entry(fp, &subs->fmt_list, list) {
		if (!hw_check_valid_format(subs, params, fp))
			continue;
		if (changed++) {
			if (rmin > fp->channels)
				rmin = fp->channels;
			if (rmax < fp->channels)
				rmax = fp->channels;
		} else {
			rmin = fp->channels;
			rmax = fp->channels;
		}
	}

	if (!changed) {
		hwc_debug("  --> get empty\n");
		it->empty = 1;
		return -EINVAL;
	}

	changed = 0;
	if (it->min < rmin) {
		it->min = rmin;
		it->openmin = 0;
		changed = 1;
	}
	if (it->max > rmax) {
		it->max = rmax;
		it->openmax = 0;
		changed = 1;
	}
	if (snd_interval_checkempty(it)) {
		it->empty = 1;
		return -EINVAL;
	}
	hwc_debug("  --> (%d, %d) (changed = %d)\n", it->min, it->max, changed);
	return changed;
}

static int hw_rule_format(struct snd_pcm_hw_params *params,
			  struct snd_pcm_hw_rule *rule)
{
	struct snd_usb_substream *subs = rule->private;
	struct audioformat *fp;
	struct snd_mask *fmt = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);
	u64 fbits;
	u32 oldbits[2];
	int changed;

	hwc_debug("hw_rule_format: %x:%x\n", fmt->bits[0], fmt->bits[1]);
	fbits = 0;
	list_for_each_entry(fp, &subs->fmt_list, list) {
		if (!hw_check_valid_format(subs, params, fp))
			continue;
		fbits |= fp->formats;
	}

	oldbits[0] = fmt->bits[0];
	oldbits[1] = fmt->bits[1];
	fmt->bits[0] &= (u32)fbits;
	fmt->bits[1] &= (u32)(fbits >> 32);
	if (!fmt->bits[0] && !fmt->bits[1]) {
		hwc_debug("  --> get empty\n");
		return -EINVAL;
	}
	changed = (oldbits[0] != fmt->bits[0] || oldbits[1] != fmt->bits[1]);
	hwc_debug("  --> %x:%x (changed = %d)\n", fmt->bits[0], fmt->bits[1], changed);
	return changed;
}

static int hw_rule_period_time(struct snd_pcm_hw_params *params,
			       struct snd_pcm_hw_rule *rule)
{
	struct snd_usb_substream *subs = rule->private;
	struct audioformat *fp;
	struct snd_interval *it;
	unsigned char min_datainterval;
	unsigned int pmin;
	int changed;

	it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_PERIOD_TIME);
	hwc_debug("hw_rule_period_time: (%u,%u)\n", it->min, it->max);
	min_datainterval = 0xff;
	list_for_each_entry(fp, &subs->fmt_list, list) {
		if (!hw_check_valid_format(subs, params, fp))
			continue;
		min_datainterval = min(min_datainterval, fp->datainterval);
	}
	if (min_datainterval == 0xff) {
		hwc_debug("  --> get empty\n");
		it->empty = 1;
		return -EINVAL;
	}
	pmin = 125 * (1 << min_datainterval);
	changed = 0;
	if (it->min < pmin) {
		it->min = pmin;
		it->openmin = 0;
		changed = 1;
	}
	if (snd_interval_checkempty(it)) {
		it->empty = 1;
		return -EINVAL;
	}
	hwc_debug("  --> (%u,%u) (changed = %d)\n", it->min, it->max, changed);
	return changed;
}

/*
 *  If the device supports unusual bit rates, does the request meet these?
 */
static int snd_usb_pcm_check_knot(struct snd_pcm_runtime *runtime,
				  struct snd_usb_substream *subs)
{
	struct audioformat *fp;
	int *rate_list;
	int count = 0, needs_knot = 0;
	int err;

	kfree(subs->rate_list.list);
	subs->rate_list.list = NULL;

	list_for_each_entry(fp, &subs->fmt_list, list) {
		if (fp->rates & SNDRV_PCM_RATE_CONTINUOUS)
			return 0;
		count += fp->nr_rates;
		if (fp->rates & SNDRV_PCM_RATE_KNOT)
			needs_knot = 1;
	}
	if (!needs_knot)
		return 0;

	subs->rate_list.list = rate_list =
		kmalloc_array(count, sizeof(int), GFP_KERNEL);
	if (!subs->rate_list.list)
		return -ENOMEM;
	subs->rate_list.count = count;
	subs->rate_list.mask = 0;
	count = 0;
	list_for_each_entry(fp, &subs->fmt_list, list) {
		int i;
		for (i = 0; i < fp->nr_rates; i++)
			rate_list[count++] = fp->rate_table[i];
	}
	err = snd_pcm_hw_constraint_list(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
					 &subs->rate_list);
	if (err < 0)
		return err;

	return 0;
}


/*
 * set up the runtime hardware information.
 */

static int setup_hw_info(struct snd_pcm_runtime *runtime, struct snd_usb_substream *subs)
{
	struct audioformat *fp;
	unsigned int pt, ptmin;
	int param_period_time_if_needed;
	int err;

	runtime->hw.formats = subs->formats;

	runtime->hw.rate_min = 0x7fffffff;
	runtime->hw.rate_max = 0;
	runtime->hw.channels_min = 256;
	runtime->hw.channels_max = 0;
	runtime->hw.rates = 0;
	ptmin = UINT_MAX;
	/* check min/max rates and channels */
	list_for_each_entry(fp, &subs->fmt_list, list) {
		runtime->hw.rates |= fp->rates;
		if (runtime->hw.rate_min > fp->rate_min)
			runtime->hw.rate_min = fp->rate_min;
		if (runtime->hw.rate_max < fp->rate_max)
			runtime->hw.rate_max = fp->rate_max;
		if (runtime->hw.channels_min > fp->channels)
			runtime->hw.channels_min = fp->channels;
		if (runtime->hw.channels_max < fp->channels)
			runtime->hw.channels_max = fp->channels;
		if (fp->fmt_type == UAC_FORMAT_TYPE_II && fp->frame_size > 0) {
			/* FIXME: there might be more than one audio formats... */
			runtime->hw.period_bytes_min = runtime->hw.period_bytes_max =
				fp->frame_size;
		}
		pt = 125 * (1 << fp->datainterval);
		ptmin = min(ptmin, pt);
	}

	param_period_time_if_needed = SNDRV_PCM_HW_PARAM_PERIOD_TIME;
	if (subs->speed == USB_SPEED_FULL)
		/* full speed devices have fixed data packet interval */
		ptmin = 1000;
	if (ptmin == 1000)
		/* if period time doesn't go below 1 ms, no rules needed */
		param_period_time_if_needed = -1;

	err = snd_pcm_hw_constraint_minmax(runtime,
					   SNDRV_PCM_HW_PARAM_PERIOD_TIME,
					   ptmin, UINT_MAX);
	if (err < 0)
		return err;

	err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
				  hw_rule_rate, subs,
				  SNDRV_PCM_HW_PARAM_FORMAT,
				  SNDRV_PCM_HW_PARAM_CHANNELS,
				  param_period_time_if_needed,
				  -1);
	if (err < 0)
		return err;
	err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_CHANNELS,
				  hw_rule_channels, subs,
				  SNDRV_PCM_HW_PARAM_FORMAT,
				  SNDRV_PCM_HW_PARAM_RATE,
				  param_period_time_if_needed,
				  -1);
	if (err < 0)
		return err;
	err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FORMAT,
				  hw_rule_format, subs,
				  SNDRV_PCM_HW_PARAM_RATE,
				  SNDRV_PCM_HW_PARAM_CHANNELS,
				  param_period_time_if_needed,
				  -1);
	if (err < 0)
		return err;
	if (param_period_time_if_needed >= 0) {
		err = snd_pcm_hw_rule_add(runtime, 0,
					  SNDRV_PCM_HW_PARAM_PERIOD_TIME,
					  hw_rule_period_time, subs,
					  SNDRV_PCM_HW_PARAM_FORMAT,
					  SNDRV_PCM_HW_PARAM_CHANNELS,
					  SNDRV_PCM_HW_PARAM_RATE,
					  -1);
		if (err < 0)
			return err;
	}
	err = snd_usb_pcm_check_knot(runtime, subs);
	if (err < 0)
		return err;

	return snd_usb_autoresume(subs->stream->chip);
}

static int snd_usb_pcm_open(struct snd_pcm_substream *substream)
{
	int direction = substream->stream;
	struct snd_usb_stream *as = snd_pcm_substream_chip(substream);
	struct snd_pcm_runtime *runtime = substream->runtime;
	struct snd_usb_substream *subs = &as->substream[direction];
	int ret;

	subs->interface = -1;
	subs->altset_idx = 0;
	runtime->hw = snd_usb_hardware;
	runtime->private_data = subs;
	subs->pcm_substream = substream;
	/* runtime PM is also done there */

	/* initialize DSD/DOP context */
	subs->dsd_dop.byte_idx = 0;
	subs->dsd_dop.channel = 0;
	subs->dsd_dop.marker = 1;

	ret = setup_hw_info(runtime, subs);
	if (ret == 0) {
		ret = snd_media_stream_init(subs, as->pcm, direction);
		if (ret)
			snd_usb_autosuspend(subs->stream->chip);
	}
	return ret;
}

static int snd_usb_pcm_close(struct snd_pcm_substream *substream)
{
	int direction = substream->stream;
	struct snd_usb_stream *as = snd_pcm_substream_chip(substream);
	struct snd_usb_substream *subs = &as->substream[direction];
	int ret;

	snd_media_stop_pipeline(subs);

	if (!as->chip->keep_iface &&
	    subs->interface >= 0 &&
	    !snd_usb_lock_shutdown(subs->stream->chip)) {
		usb_set_interface(subs->dev, subs->interface, 0);
		subs->interface = -1;
		ret = snd_usb_pcm_change_state(subs, UAC3_PD_STATE_D1);
		snd_usb_unlock_shutdown(subs->stream->chip);
		if (ret < 0)
			return ret;
	}

	subs->pcm_substream = NULL;
	snd_usb_autosuspend(subs->stream->chip);

	return 0;
}

/* Since a URB can handle only a single linear buffer, we must use double
 * buffering when the data to be transferred overflows the buffer boundary.
 * To avoid inconsistencies when updating hwptr_done, we use double buffering
 * for all URBs.
 */
static void retire_capture_urb(struct snd_usb_substream *subs,
			       struct urb *urb)
{
	struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime;
	unsigned int stride, frames, bytes, oldptr;
	int i, period_elapsed = 0;
	unsigned long flags;
	unsigned char *cp;
	int current_frame_number;

	/* read frame number here, update pointer in critical section */
	current_frame_number = usb_get_current_frame_number(subs->dev);

	stride = runtime->frame_bits >> 3;

	for (i = 0; i < urb->number_of_packets; i++) {
		cp = (unsigned char *)urb->transfer_buffer + urb->iso_frame_desc[i].offset + subs->pkt_offset_adj;
		if (urb->iso_frame_desc[i].status && printk_ratelimit()) {
			dev_dbg(&subs->dev->dev, "frame %d active: %d\n",
				i, urb->iso_frame_desc[i].status);
			// continue;
		}
		bytes = urb->iso_frame_desc[i].actual_length;
		frames = bytes / stride;
		if (!subs->txfr_quirk)
			bytes = frames * stride;
		if (bytes % (runtime->sample_bits >> 3) != 0) {
			int oldbytes = bytes;
			bytes = frames * stride;
			dev_warn_ratelimited(&subs->dev->dev,
				 "Corrected urb data len. %d->%d\n",
							oldbytes, bytes);
		}
		/* update the current pointer */
		spin_lock_irqsave(&subs->lock, flags);
		oldptr = subs->hwptr_done;
		subs->hwptr_done += bytes;
		if (subs->hwptr_done >= runtime->buffer_size * stride)
			subs->hwptr_done -= runtime->buffer_size * stride;
		frames = (bytes + (oldptr % stride)) / stride;
		subs->transfer_done += frames;
		if (subs->transfer_done >= runtime->period_size) {
			subs->transfer_done -= runtime->period_size;
			period_elapsed = 1;
		}
		/* capture delay is by construction limited to one URB,
		 * reset delays here
		 */
		runtime->delay = subs->last_delay = 0;

		/* realign last_frame_number */
		subs->last_frame_number = current_frame_number;
		subs->last_frame_number &= 0xFF; /* keep 8 LSBs */

		spin_unlock_irqrestore(&subs->lock, flags);
		/* copy a data chunk */
		if (oldptr + bytes > runtime->buffer_size * stride) {
			unsigned int bytes1 =
					runtime->buffer_size * stride - oldptr;
			memcpy(runtime->dma_area + oldptr, cp, bytes1);
			memcpy(runtime->dma_area, cp + bytes1, bytes - bytes1);
		} else {
			memcpy(runtime->dma_area + oldptr, cp, bytes);
		}
	}

	if (period_elapsed)
		snd_pcm_period_elapsed(subs->pcm_substream);
}

static inline void fill_playback_urb_dsd_dop(struct snd_usb_substream *subs,
					     struct urb *urb, unsigned int bytes)
{
	struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime;
	unsigned int stride = runtime->frame_bits >> 3;
	unsigned int dst_idx = 0;
	unsigned int src_idx = subs->hwptr_done;
	unsigned int wrap = runtime->buffer_size * stride;
	u8 *dst = urb->transfer_buffer;
	u8 *src = runtime->dma_area;
	u8 marker[] = { 0x05, 0xfa };

	/*
	 * The DSP DOP format defines a way to transport DSD samples over
	 * normal PCM data endpoints. It requires stuffing of marker bytes
	 * (0x05 and 0xfa, alternating per sample frame), and then expects
	 * 2 additional bytes of actual payload. The whole frame is stored
	 * LSB.
	 *
	 * Hence, for a stereo transport, the buffer layout looks like this,
	 * where L refers to left channel samples and R to right.
	 *
	 *   L1 L2 0x05   R1 R2 0x05   L3 L4 0xfa  R3 R4 0xfa
	 *   L5 L6 0x05   R5 R6 0x05   L7 L8 0xfa  R7 R8 0xfa
	 *   .....
	 *
	 */

	while (bytes--) {
		if (++subs->dsd_dop.byte_idx == 3) {
			/* frame boundary? */
			dst[dst_idx++] = marker[subs->dsd_dop.marker];
			src_idx += 2;
			subs->dsd_dop.byte_idx = 0;

			if (++subs->dsd_dop.channel % runtime->channels == 0) {
				/* alternate the marker */
				subs->dsd_dop.marker++;
				subs->dsd_dop.marker %= ARRAY_SIZE(marker);
				subs->dsd_dop.channel = 0;
			}
		} else {
			/* stuff the DSD payload */
			int idx = (src_idx + subs->dsd_dop.byte_idx - 1) % wrap;

			if (subs->cur_audiofmt->dsd_bitrev)
				dst[dst_idx++] = bitrev8(src[idx]);
			else
				dst[dst_idx++] = src[idx];

			subs->hwptr_done++;
		}
	}
	if (subs->hwptr_done >= runtime->buffer_size * stride)
		subs->hwptr_done -= runtime->buffer_size * stride;
}

static void copy_to_urb(struct snd_usb_substream *subs, struct urb *urb,
			int offset, int stride, unsigned int bytes)
{
	struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime;

	if (subs->hwptr_done + bytes > runtime->buffer_size * stride) {
		/* err, the transferred area goes over buffer boundary. */
		unsigned int bytes1 =
			runtime->buffer_size * stride - subs->hwptr_done;
		memcpy(urb->transfer_buffer + offset,
		       runtime->dma_area + subs->hwptr_done, bytes1);
		memcpy(urb->transfer_buffer + offset + bytes1,
		       runtime->dma_area, bytes - bytes1);
	} else {
		memcpy(urb->transfer_buffer + offset,
		       runtime->dma_area + subs->hwptr_done, bytes);
	}
	subs->hwptr_done += bytes;
	if (subs->hwptr_done >= runtime->buffer_size * stride)
		subs->hwptr_done -= runtime->buffer_size * stride;
}

static unsigned int copy_to_urb_quirk(struct snd_usb_substream *subs,
				      struct urb *urb, int stride,
				      unsigned int bytes)
{
	__le32 packet_length;
	int i;

	/* Put __le32 length descriptor at start of each packet. */
	for (i = 0; i < urb->number_of_packets; i++) {
		unsigned int length = urb->iso_frame_desc[i].length;
		unsigned int offset = urb->iso_frame_desc[i].offset;

		packet_length = cpu_to_le32(length);
		offset += i * sizeof(packet_length);
		urb->iso_frame_desc[i].offset = offset;
		urb->iso_frame_desc[i].length += sizeof(packet_length);
		memcpy(urb->transfer_buffer + offset,
		       &packet_length, sizeof(packet_length));
		copy_to_urb(subs, urb, offset + sizeof(packet_length),
			    stride, length);
	}
	/* Adjust transfer size accordingly. */
	bytes += urb->number_of_packets * sizeof(packet_length);
	return bytes;
}

static void prepare_playback_urb(struct snd_usb_substream *subs,
				 struct urb *urb)
{
	struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime;
	struct snd_usb_endpoint *ep = subs->data_endpoint;
	struct snd_urb_ctx *ctx = urb->context;
	unsigned int counts, frames, bytes;
	int i, stride, period_elapsed = 0;
	unsigned long flags;

	stride = runtime->frame_bits >> 3;

	frames = 0;
	urb->number_of_packets = 0;
	spin_lock_irqsave(&subs->lock, flags);
	subs->frame_limit += ep->max_urb_frames;
	for (i = 0; i < ctx->packets; i++) {
		if (ctx->packet_size[i])
			counts = ctx->packet_size[i];
		else
			counts = snd_usb_endpoint_next_packet_size(ep);

		/* set up descriptor */
		urb->iso_frame_desc[i].offset = frames * ep->stride;
		urb->iso_frame_desc[i].length = counts * ep->stride;
		frames += counts;
		urb->number_of_packets++;
		subs->transfer_done += counts;
		if (subs->transfer_done >= runtime->period_size) {
			subs->transfer_done -= runtime->period_size;
			subs->frame_limit = 0;
			period_elapsed = 1;
			if (subs->fmt_type == UAC_FORMAT_TYPE_II) {
				if (subs->transfer_done > 0) {
					/* FIXME: fill-max mode is not
					 * supported yet */
					frames -= subs->transfer_done;
					counts -= subs->transfer_done;
					urb->iso_frame_desc[i].length =
						counts * ep->stride;
					subs->transfer_done = 0;
				}
				i++;
				if (i < ctx->packets) {
					/* add a transfer delimiter */
					urb->iso_frame_desc[i].offset =
						frames * ep->stride;
					urb->iso_frame_desc[i].length = 0;
					urb->number_of_packets++;
				}
				break;
			}
		}
		/* finish at the period boundary or after enough frames */
		if ((period_elapsed ||
				subs->transfer_done >= subs->frame_limit) &&
		    !snd_usb_endpoint_implicit_feedback_sink(ep))
			break;
	}
	bytes = frames * ep->stride;

	if (unlikely(subs->pcm_format == SNDRV_PCM_FORMAT_DSD_U16_LE &&
		     subs->cur_audiofmt->dsd_dop)) {
		fill_playback_urb_dsd_dop(subs, urb, bytes);
	} else if (unlikely(subs->pcm_format == SNDRV_PCM_FORMAT_DSD_U8 &&
			   subs->cur_audiofmt->dsd_bitrev)) {
		/* bit-reverse the bytes */
		u8 *buf = urb->transfer_buffer;
		for (i = 0; i < bytes; i++) {
			int idx = (subs->hwptr_done + i)
				% (runtime->buffer_size * stride);
			buf[i] = bitrev8(runtime->dma_area[idx]);
		}

		subs->hwptr_done += bytes;
		if (subs->hwptr_done >= runtime->buffer_size * stride)
			subs->hwptr_done -= runtime->buffer_size * stride;
	} else {
		/* usual PCM */
		if (!subs->tx_length_quirk)
			copy_to_urb(subs, urb, 0, stride, bytes);
		else
			bytes = copy_to_urb_quirk(subs, urb, stride, bytes);
			/* bytes is now amount of outgoing data */
	}

	/* update delay with exact number of samples queued */
	runtime->delay = subs->last_delay;
	runtime->delay += frames;
	subs->last_delay = runtime->delay;

	/* realign last_frame_number */
	subs->last_frame_number = usb_get_current_frame_number(subs->dev);
	subs->last_frame_number &= 0xFF; /* keep 8 LSBs */

	if (subs->trigger_tstamp_pending_update) {
		/* this is the first actual URB submitted,
		 * update trigger timestamp to reflect actual start time
		 */
		snd_pcm_gettime(runtime, &runtime->trigger_tstamp);
		subs->trigger_tstamp_pending_update = false;
	}

	spin_unlock_irqrestore(&subs->lock, flags);
	urb->transfer_buffer_length = bytes;
	if (period_elapsed)
		snd_pcm_period_elapsed(subs->pcm_substream);
}

/*
 * process after playback data complete
 * - decrease the delay count again
 */
static void retire_playback_urb(struct snd_usb_substream *subs,
			       struct urb *urb)
{
	unsigned long flags;
	struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime;
	struct snd_usb_endpoint *ep = subs->data_endpoint;
	int processed = urb->transfer_buffer_length / ep->stride;
	int est_delay;

	/* ignore the delay accounting when procssed=0 is given, i.e.
	 * silent payloads are procssed before handling the actual data
	 */
	if (!processed)
		return;

	spin_lock_irqsave(&subs->lock, flags);
	if (!subs->last_delay)
		goto out; /* short path */

	est_delay = snd_usb_pcm_delay(subs, runtime->rate);
	/* update delay with exact number of samples played */
	if (processed > subs->last_delay)
		subs->last_delay = 0;
	else
		subs->last_delay -= processed;
	runtime->delay = subs->last_delay;

	/*
	 * Report when delay estimate is off by more than 2ms.
	 * The error should be lower than 2ms since the estimate relies
	 * on two reads of a counter updated every ms.
	 */
	if (abs(est_delay - subs->last_delay) * 1000 > runtime->rate * 2)
		dev_dbg_ratelimited(&subs->dev->dev,
			"delay: estimated %d, actual %d\n",
			est_delay, subs->last_delay);

	if (!subs->running) {
		/* update last_frame_number for delay counting here since
		 * prepare_playback_urb won't be called during pause
		 */
		subs->last_frame_number =
			usb_get_current_frame_number(subs->dev) & 0xff;
	}

 out:
	spin_unlock_irqrestore(&subs->lock, flags);
}

static int snd_usb_substream_playback_trigger(struct snd_pcm_substream *substream,
					      int cmd)
{
	struct snd_usb_substream *subs = substream->runtime->private_data;

	switch (cmd) {
	case SNDRV_PCM_TRIGGER_START:
		subs->trigger_tstamp_pending_update = true;
		/* fall through */
	case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
		subs->data_endpoint->prepare_data_urb = prepare_playback_urb;
		subs->data_endpoint->retire_data_urb = retire_playback_urb;
		subs->running = 1;
		return 0;
	case SNDRV_PCM_TRIGGER_STOP:
		stop_endpoints(subs);
		subs->running = 0;
		return 0;
	case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
		subs->data_endpoint->prepare_data_urb = NULL;
		/* keep retire_data_urb for delay calculation */
		subs->data_endpoint->retire_data_urb = retire_playback_urb;
		subs->running = 0;
		return 0;
	case SNDRV_PCM_TRIGGER_SUSPEND:
		if (subs->stream->chip->setup_fmt_after_resume_quirk) {
			stop_endpoints(subs);
			subs->need_setup_fmt = true;
			return 0;
		}
		break;
	}

	return -EINVAL;
}

static int snd_usb_substream_capture_trigger(struct snd_pcm_substream *substream,
					     int cmd)
{
	int err;
	struct snd_usb_substream *subs = substream->runtime->private_data;

	switch (cmd) {
	case SNDRV_PCM_TRIGGER_START:
		err = start_endpoints(subs);
		if (err < 0)
			return err;

		subs->data_endpoint->retire_data_urb = retire_capture_urb;
		subs->running = 1;
		return 0;
	case SNDRV_PCM_TRIGGER_STOP:
		stop_endpoints(subs);
		subs->running = 0;
		return 0;
	case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
		subs->data_endpoint->retire_data_urb = NULL;
		subs->running = 0;
		return 0;
	case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
		subs->data_endpoint->retire_data_urb = retire_capture_urb;
		subs->running = 1;
		return 0;
	case SNDRV_PCM_TRIGGER_SUSPEND:
		if (subs->stream->chip->setup_fmt_after_resume_quirk) {
			stop_endpoints(subs);
			subs->need_setup_fmt = true;
			return 0;
		}
		break;
	}

	return -EINVAL;
}

static const struct snd_pcm_ops snd_usb_playback_ops = {
	.open =		snd_usb_pcm_open,
	.close =	snd_usb_pcm_close,
	.hw_params =	snd_usb_hw_params,
	.hw_free =	snd_usb_hw_free,
	.prepare =	snd_usb_pcm_prepare,
	.trigger =	snd_usb_substream_playback_trigger,
	.sync_stop =	snd_usb_pcm_sync_stop,
	.pointer =	snd_usb_pcm_pointer,
};

static const struct snd_pcm_ops snd_usb_capture_ops = {
	.open =		snd_usb_pcm_open,
	.close =	snd_usb_pcm_close,
	.hw_params =	snd_usb_hw_params,
	.hw_free =	snd_usb_hw_free,
	.prepare =	snd_usb_pcm_prepare,
	.trigger =	snd_usb_substream_capture_trigger,
	.sync_stop =	snd_usb_pcm_sync_stop,
	.pointer =	snd_usb_pcm_pointer,
};

void snd_usb_set_pcm_ops(struct snd_pcm *pcm, int stream)
{
	const struct snd_pcm_ops *ops;

	ops = stream == SNDRV_PCM_STREAM_PLAYBACK ?
			&snd_usb_playback_ops : &snd_usb_capture_ops;
	snd_pcm_set_ops(pcm, stream, ops);
}

void snd_usb_preallocate_buffer(struct snd_usb_substream *subs)
{
	struct snd_pcm *pcm = subs->stream->pcm;
	struct snd_pcm_substream *s = pcm->streams[subs->direction].substream;
	struct device *dev = subs->dev->bus->controller;

	if (snd_usb_use_vmalloc)
		snd_pcm_set_managed_buffer(s, SNDRV_DMA_TYPE_VMALLOC,
					   NULL, 0, 0);
	else
		snd_pcm_set_managed_buffer(s, SNDRV_DMA_TYPE_DEV_SG,
					   dev, 64*1024, 512*1024);
}