aboutsummaryrefslogtreecommitdiff
path: root/sound/usb/quirks.c
blob: 6adde457b602e08aedd1806e8b79863d65e006cc (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
/*
 *   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 <linux/init.h>
#include <linux/slab.h>
#include <linux/usb.h>
#include <linux/usb/audio.h>
#include <linux/usb/midi.h>

#include <sound/control.h>
#include <sound/core.h>
#include <sound/info.h>
#include <sound/pcm.h>

#include "usbaudio.h"
#include "card.h"
#include "mixer.h"
#include "mixer_quirks.h"
#include "midi.h"
#include "quirks.h"
#include "helper.h"
#include "endpoint.h"
#include "pcm.h"
#include "clock.h"
#include "stream.h"

/*
 * handle the quirks for the contained interfaces
 */
static int create_composite_quirk(struct snd_usb_audio *chip,
				  struct usb_interface *iface,
				  struct usb_driver *driver,
				  const struct snd_usb_audio_quirk *quirk_comp)
{
	int probed_ifnum = get_iface_desc(iface->altsetting)->bInterfaceNumber;
	const struct snd_usb_audio_quirk *quirk;
	int err;

	for (quirk = quirk_comp->data; quirk->ifnum >= 0; ++quirk) {
		iface = usb_ifnum_to_if(chip->dev, quirk->ifnum);
		if (!iface)
			continue;
		if (quirk->ifnum != probed_ifnum &&
		    usb_interface_claimed(iface))
			continue;
		err = snd_usb_create_quirk(chip, iface, driver, quirk);
		if (err < 0)
			return err;
	}

	for (quirk = quirk_comp->data; quirk->ifnum >= 0; ++quirk) {
		iface = usb_ifnum_to_if(chip->dev, quirk->ifnum);
		if (!iface)
			continue;
		if (quirk->ifnum != probed_ifnum &&
		    !usb_interface_claimed(iface))
			usb_driver_claim_interface(driver, iface, (void *)-1L);
	}

	return 0;
}

static int ignore_interface_quirk(struct snd_usb_audio *chip,
				  struct usb_interface *iface,
				  struct usb_driver *driver,
				  const struct snd_usb_audio_quirk *quirk)
{
	return 0;
}


/*
 * Allow alignment on audio sub-slot (channel samples) rather than
 * on audio slots (audio frames)
 */
static int create_align_transfer_quirk(struct snd_usb_audio *chip,
				       struct usb_interface *iface,
				       struct usb_driver *driver,
				       const struct snd_usb_audio_quirk *quirk)
{
	chip->txfr_quirk = 1;
	return 1;	/* Continue with creating streams and mixer */
}

static int create_any_midi_quirk(struct snd_usb_audio *chip,
				 struct usb_interface *intf,
				 struct usb_driver *driver,
				 const struct snd_usb_audio_quirk *quirk)
{
	return snd_usbmidi_create(chip->card, intf, &chip->midi_list, quirk);
}

/*
 * create a stream for an interface with proper descriptors
 */
static int create_standard_audio_quirk(struct snd_usb_audio *chip,
				       struct usb_interface *iface,
				       struct usb_driver *driver,
				       const struct snd_usb_audio_quirk *quirk)
{
	struct usb_host_interface *alts;
	struct usb_interface_descriptor *altsd;
	int err;

	if (chip->usb_id == USB_ID(0x1686, 0x00dd)) /* Zoom R16/24 */
		chip->tx_length_quirk = 1;

	alts = &iface->altsetting[0];
	altsd = get_iface_desc(alts);
	err = snd_usb_parse_audio_interface(chip, altsd->bInterfaceNumber);
	if (err < 0) {
		usb_audio_err(chip, "cannot setup if %d: error %d\n",
			   altsd->bInterfaceNumber, err);
		return err;
	}
	/* reset the current interface */
	usb_set_interface(chip->dev, altsd->bInterfaceNumber, 0);
	return 0;
}

/*
 * create a stream for an endpoint/altsetting without proper descriptors
 */
static int create_fixed_stream_quirk(struct snd_usb_audio *chip,
				     struct usb_interface *iface,
				     struct usb_driver *driver,
				     const struct snd_usb_audio_quirk *quirk)
{
	struct audioformat *fp;
	struct usb_host_interface *alts;
	struct usb_interface_descriptor *altsd;
	int stream, err;
	unsigned *rate_table = NULL;

	fp = kmemdup(quirk->data, sizeof(*fp), GFP_KERNEL);
	if (!fp) {
		usb_audio_err(chip, "cannot memdup\n");
		return -ENOMEM;
	}
	INIT_LIST_HEAD(&fp->list);
	if (fp->nr_rates > MAX_NR_RATES) {
		kfree(fp);
		return -EINVAL;
	}
	if (fp->nr_rates > 0) {
		rate_table = kmemdup(fp->rate_table,
				     sizeof(int) * fp->nr_rates, GFP_KERNEL);
		if (!rate_table) {
			kfree(fp);
			return -ENOMEM;
		}
		fp->rate_table = rate_table;
	}

	stream = (fp->endpoint & USB_DIR_IN)
		? SNDRV_PCM_STREAM_CAPTURE : SNDRV_PCM_STREAM_PLAYBACK;
	err = snd_usb_add_audio_stream(chip, stream, fp);
	if (err < 0)
		goto error;
	if (fp->iface != get_iface_desc(&iface->altsetting[0])->bInterfaceNumber ||
	    fp->altset_idx >= iface->num_altsetting) {
		err = -EINVAL;
		goto error;
	}
	alts = &iface->altsetting[fp->altset_idx];
	altsd = get_iface_desc(alts);
	if (altsd->bNumEndpoints < 1) {
		err = -EINVAL;
		goto error;
	}

	fp->protocol = altsd->bInterfaceProtocol;

	if (fp->datainterval == 0)
		fp->datainterval = snd_usb_parse_datainterval(chip, alts);
	if (fp->maxpacksize == 0)
		fp->maxpacksize = le16_to_cpu(get_endpoint(alts, 0)->wMaxPacketSize);
	usb_set_interface(chip->dev, fp->iface, 0);
	snd_usb_init_pitch(chip, fp->iface, alts, fp);
	snd_usb_init_sample_rate(chip, fp->iface, alts, fp, fp->rate_max);
	return 0;

 error:
	list_del(&fp->list); /* unlink for avoiding double-free */
	kfree(fp);
	kfree(rate_table);
	return err;
}

static int create_auto_pcm_quirk(struct snd_usb_audio *chip,
				 struct usb_interface *iface,
				 struct usb_driver *driver)
{
	struct usb_host_interface *alts;
	struct usb_interface_descriptor *altsd;
	struct usb_endpoint_descriptor *epd;
	struct uac1_as_header_descriptor *ashd;
	struct uac_format_type_i_discrete_descriptor *fmtd;

	/*
	 * Most Roland/Yamaha audio streaming interfaces have more or less
	 * standard descriptors, but older devices might lack descriptors, and
	 * future ones might change, so ensure that we fail silently if the
	 * interface doesn't look exactly right.
	 */

	/* must have a non-zero altsetting for streaming */
	if (iface->num_altsetting < 2)
		return -ENODEV;
	alts = &iface->altsetting[1];
	altsd = get_iface_desc(alts);

	/* must have an isochronous endpoint for streaming */
	if (altsd->bNumEndpoints < 1)
		return -ENODEV;
	epd = get_endpoint(alts, 0);
	if (!usb_endpoint_xfer_isoc(epd))
		return -ENODEV;

	/* must have format descriptors */
	ashd = snd_usb_find_csint_desc(alts->extra, alts->extralen, NULL,
				       UAC_AS_GENERAL);
	fmtd = snd_usb_find_csint_desc(alts->extra, alts->extralen, NULL,
				       UAC_FORMAT_TYPE);
	if (!ashd || ashd->bLength < 7 ||
	    !fmtd || fmtd->bLength < 8)
		return -ENODEV;

	return create_standard_audio_quirk(chip, iface, driver, NULL);
}

static int create_yamaha_midi_quirk(struct snd_usb_audio *chip,
				    struct usb_interface *iface,
				    struct usb_driver *driver,
				    struct usb_host_interface *alts)
{
	static const struct snd_usb_audio_quirk yamaha_midi_quirk = {
		.type = QUIRK_MIDI_YAMAHA
	};
	struct usb_midi_in_jack_descriptor *injd;
	struct usb_midi_out_jack_descriptor *outjd;

	/* must have some valid jack descriptors */
	injd = snd_usb_find_csint_desc(alts->extra, alts->extralen,
				       NULL, USB_MS_MIDI_IN_JACK);
	outjd = snd_usb_find_csint_desc(alts->extra, alts->extralen,
					NULL, USB_MS_MIDI_OUT_JACK);
	if (!injd && !outjd)
		return -ENODEV;
	if (injd && (injd->bLength < 5 ||
		     (injd->bJackType != USB_MS_EMBEDDED &&
		      injd->bJackType != USB_MS_EXTERNAL)))
		return -ENODEV;
	if (outjd && (outjd->bLength < 6 ||
		      (outjd->bJackType != USB_MS_EMBEDDED &&
		       outjd->bJackType != USB_MS_EXTERNAL)))
		return -ENODEV;
	return create_any_midi_quirk(chip, iface, driver, &yamaha_midi_quirk);
}

static int create_roland_midi_quirk(struct snd_usb_audio *chip,
				    struct usb_interface *iface,
				    struct usb_driver *driver,
				    struct usb_host_interface *alts)
{
	static const struct snd_usb_audio_quirk roland_midi_quirk = {
		.type = QUIRK_MIDI_ROLAND
	};
	u8 *roland_desc = NULL;

	/* might have a vendor-specific descriptor <06 24 F1 02 ...> */
	for (;;) {
		roland_desc = snd_usb_find_csint_desc(alts->extra,
						      alts->extralen,
						      roland_desc, 0xf1);
		if (!roland_desc)
			return -ENODEV;
		if (roland_desc[0] < 6 || roland_desc[3] != 2)
			continue;
		return create_any_midi_quirk(chip, iface, driver,
					     &roland_midi_quirk);
	}
}

static int create_std_midi_quirk(struct snd_usb_audio *chip,
				 struct usb_interface *iface,
				 struct usb_driver *driver,
				 struct usb_host_interface *alts)
{
	struct usb_ms_header_descriptor *mshd;
	struct usb_ms_endpoint_descriptor *msepd;

	/* must have the MIDIStreaming interface header descriptor*/
	mshd = (struct usb_ms_header_descriptor *)alts->extra;
	if (alts->extralen < 7 ||
	    mshd->bLength < 7 ||
	    mshd->bDescriptorType != USB_DT_CS_INTERFACE ||
	    mshd->bDescriptorSubtype != USB_MS_HEADER)
		return -ENODEV;
	/* must have the MIDIStreaming endpoint descriptor*/
	msepd = (struct usb_ms_endpoint_descriptor *)alts->endpoint[0].extra;
	if (alts->endpoint[0].extralen < 4 ||
	    msepd->bLength < 4 ||
	    msepd->bDescriptorType != USB_DT_CS_ENDPOINT ||
	    msepd->bDescriptorSubtype != UAC_MS_GENERAL ||
	    msepd->bNumEmbMIDIJack < 1 ||
	    msepd->bNumEmbMIDIJack > 16)
		return -ENODEV;

	return create_any_midi_quirk(chip, iface, driver, NULL);
}

static int create_auto_midi_quirk(struct snd_usb_audio *chip,
				  struct usb_interface *iface,
				  struct usb_driver *driver)
{
	struct usb_host_interface *alts;
	struct usb_interface_descriptor *altsd;
	struct usb_endpoint_descriptor *epd;
	int err;

	alts = &iface->altsetting[0];
	altsd = get_iface_desc(alts);

	/* must have at least one bulk/interrupt endpoint for streaming */
	if (altsd->bNumEndpoints < 1)
		return -ENODEV;
	epd = get_endpoint(alts, 0);
	if (!usb_endpoint_xfer_bulk(epd) &&
	    !usb_endpoint_xfer_int(epd))
		return -ENODEV;

	switch (USB_ID_VENDOR(chip->usb_id)) {
	case 0x0499: /* Yamaha */
		err = create_yamaha_midi_quirk(chip, iface, driver, alts);
		if (err != -ENODEV)
			return err;
		break;
	case 0x0582: /* Roland */
		err = create_roland_midi_quirk(chip, iface, driver, alts);
		if (err != -ENODEV)
			return err;
		break;
	}

	return create_std_midi_quirk(chip, iface, driver, alts);
}

static int create_autodetect_quirk(struct snd_usb_audio *chip,
				   struct usb_interface *iface,
				   struct usb_driver *driver)
{
	int err;

	err = create_auto_pcm_quirk(chip, iface, driver);
	if (err == -ENODEV)
		err = create_auto_midi_quirk(chip, iface, driver);
	return err;
}

static int create_autodetect_quirks(struct snd_usb_audio *chip,
				    struct usb_interface *iface,
				    struct usb_driver *driver,
				    const struct snd_usb_audio_quirk *quirk)
{
	int probed_ifnum = get_iface_desc(iface->altsetting)->bInterfaceNumber;
	int ifcount, ifnum, err;

	err = create_autodetect_quirk(chip, iface, driver);
	if (err < 0)
		return err;

	/*
	 * ALSA PCM playback/capture devices cannot be registered in two steps,
	 * so we have to claim the other corresponding interface here.
	 */
	ifcount = chip->dev->actconfig->desc.bNumInterfaces;
	for (ifnum = 0; ifnum < ifcount; ifnum++) {
		if (ifnum == probed_ifnum || quirk->ifnum >= 0)
			continue;
		iface = usb_ifnum_to_if(chip->dev, ifnum);
		if (!iface ||
		    usb_interface_claimed(iface) ||
		    get_iface_desc(iface->altsetting)->bInterfaceClass !=
							USB_CLASS_VENDOR_SPEC)
			continue;

		err = create_autodetect_quirk(chip, iface, driver);
		if (err >= 0)
			usb_driver_claim_interface(driver, iface, (void *)-1L);
	}

	return 0;
}

/*
 * Create a stream for an Edirol UA-700/UA-25/UA-4FX interface.  
 * The only way to detect the sample rate is by looking at wMaxPacketSize.
 */
static int create_uaxx_quirk(struct snd_usb_audio *chip,
			     struct usb_interface *iface,
			     struct usb_driver *driver,
			     const struct snd_usb_audio_quirk *quirk)
{
	static const struct audioformat ua_format = {
		.formats = SNDRV_PCM_FMTBIT_S24_3LE,
		.channels = 2,
		.fmt_type = UAC_FORMAT_TYPE_I,
		.altsetting = 1,
		.altset_idx = 1,
		.rates = SNDRV_PCM_RATE_CONTINUOUS,
	};
	struct usb_host_interface *alts;
	struct usb_interface_descriptor *altsd;
	struct audioformat *fp;
	int stream, err;

	/* both PCM and MIDI interfaces have 2 or more altsettings */
	if (iface->num_altsetting < 2)
		return -ENXIO;
	alts = &iface->altsetting[1];
	altsd = get_iface_desc(alts);

	if (altsd->bNumEndpoints == 2) {
		static const struct snd_usb_midi_endpoint_info ua700_ep = {
			.out_cables = 0x0003,
			.in_cables  = 0x0003
		};
		static const struct snd_usb_audio_quirk ua700_quirk = {
			.type = QUIRK_MIDI_FIXED_ENDPOINT,
			.data = &ua700_ep
		};
		static const struct snd_usb_midi_endpoint_info uaxx_ep = {
			.out_cables = 0x0001,
			.in_cables  = 0x0001
		};
		static const struct snd_usb_audio_quirk uaxx_quirk = {
			.type = QUIRK_MIDI_FIXED_ENDPOINT,
			.data = &uaxx_ep
		};
		const struct snd_usb_audio_quirk *quirk =
			chip->usb_id == USB_ID(0x0582, 0x002b)
			? &ua700_quirk : &uaxx_quirk;
		return __snd_usbmidi_create(chip->card, iface,
					  &chip->midi_list, quirk,
					  chip->usb_id);
	}

	if (altsd->bNumEndpoints != 1)
		return -ENXIO;

	fp = kmemdup(&ua_format, sizeof(*fp), GFP_KERNEL);
	if (!fp)
		return -ENOMEM;

	fp->iface = altsd->bInterfaceNumber;
	fp->endpoint = get_endpoint(alts, 0)->bEndpointAddress;
	fp->ep_attr = get_endpoint(alts, 0)->bmAttributes;
	fp->datainterval = 0;
	fp->maxpacksize = le16_to_cpu(get_endpoint(alts, 0)->wMaxPacketSize);
	INIT_LIST_HEAD(&fp->list);

	switch (fp->maxpacksize) {
	case 0x120:
		fp->rate_max = fp->rate_min = 44100;
		break;
	case 0x138:
	case 0x140:
		fp->rate_max = fp->rate_min = 48000;
		break;
	case 0x258:
	case 0x260:
		fp->rate_max = fp->rate_min = 96000;
		break;
	default:
		usb_audio_err(chip, "unknown sample rate\n");
		kfree(fp);
		return -ENXIO;
	}

	stream = (fp->endpoint & USB_DIR_IN)
		? SNDRV_PCM_STREAM_CAPTURE : SNDRV_PCM_STREAM_PLAYBACK;
	err = snd_usb_add_audio_stream(chip, stream, fp);
	if (err < 0) {
		list_del(&fp->list); /* unlink for avoiding double-free */
		kfree(fp);
		return err;
	}
	usb_set_interface(chip->dev, fp->iface, 0);
	return 0;
}

/*
 * Create a standard mixer for the specified interface.
 */
static int create_standard_mixer_quirk(struct snd_usb_audio *chip,
				       struct usb_interface *iface,
				       struct usb_driver *driver,
				       const struct snd_usb_audio_quirk *quirk)
{
	if (quirk->ifnum < 0)
		return 0;

	return snd_usb_create_mixer(chip, quirk->ifnum, 0);
}

/*
 * audio-interface quirks
 *
 * returns zero if no standard audio/MIDI parsing is needed.
 * returns a positive value if standard audio/midi interfaces are parsed
 * after this.
 * returns a negative value at error.
 */
int snd_usb_create_quirk(struct snd_usb_audio *chip,
			 struct usb_interface *iface,
			 struct usb_driver *driver,
			 const struct snd_usb_audio_quirk *quirk)
{
	typedef int (*quirk_func_t)(struct snd_usb_audio *,
				    struct usb_interface *,
				    struct usb_driver *,
				    const struct snd_usb_audio_quirk *);
	static const quirk_func_t quirk_funcs[] = {
		[QUIRK_IGNORE_INTERFACE] = ignore_interface_quirk,
		[QUIRK_COMPOSITE] = create_composite_quirk,
		[QUIRK_AUTODETECT] = create_autodetect_quirks,
		[QUIRK_MIDI_STANDARD_INTERFACE] = create_any_midi_quirk,
		[QUIRK_MIDI_FIXED_ENDPOINT] = create_any_midi_quirk,
		[QUIRK_MIDI_YAMAHA] = create_any_midi_quirk,
		[QUIRK_MIDI_ROLAND] = create_any_midi_quirk,
		[QUIRK_MIDI_MIDIMAN] = create_any_midi_quirk,
		[QUIRK_MIDI_NOVATION] = create_any_midi_quirk,
		[QUIRK_MIDI_RAW_BYTES] = create_any_midi_quirk,
		[QUIRK_MIDI_EMAGIC] = create_any_midi_quirk,
		[QUIRK_MIDI_CME] = create_any_midi_quirk,
		[QUIRK_MIDI_AKAI] = create_any_midi_quirk,
		[QUIRK_MIDI_FTDI] = create_any_midi_quirk,
		[QUIRK_MIDI_CH345] = create_any_midi_quirk,
		[QUIRK_AUDIO_STANDARD_INTERFACE] = create_standard_audio_quirk,
		[QUIRK_AUDIO_FIXED_ENDPOINT] = create_fixed_stream_quirk,
		[QUIRK_AUDIO_EDIROL_UAXX] = create_uaxx_quirk,
		[QUIRK_AUDIO_ALIGN_TRANSFER] = create_align_transfer_quirk,
		[QUIRK_AUDIO_STANDARD_MIXER] = create_standard_mixer_quirk,
	};

	if (quirk->type < QUIRK_TYPE_COUNT) {
		return quirk_funcs[quirk->type](chip, iface, driver, quirk);
	} else {
		usb_audio_err(chip, "invalid quirk type %d\n", quirk->type);
		return -ENXIO;
	}
}

/*
 * boot quirks
 */

#define EXTIGY_FIRMWARE_SIZE_OLD 794
#define EXTIGY_FIRMWARE_SIZE_NEW 483

static int snd_usb_extigy_boot_quirk(struct usb_device *dev, struct usb_interface *intf)
{
	struct usb_host_config *config = dev->actconfig;
	int err;

	if (le16_to_cpu(get_cfg_desc(config)->wTotalLength) == EXTIGY_FIRMWARE_SIZE_OLD ||
	    le16_to_cpu(get_cfg_desc(config)->wTotalLength) == EXTIGY_FIRMWARE_SIZE_NEW) {
		dev_dbg(&dev->dev, "sending Extigy boot sequence...\n");
		/* Send message to force it to reconnect with full interface. */
		err = snd_usb_ctl_msg(dev, usb_sndctrlpipe(dev,0),
				      0x10, 0x43, 0x0001, 0x000a, NULL, 0);
		if (err < 0)
			dev_dbg(&dev->dev, "error sending boot message: %d\n", err);
		err = usb_get_descriptor(dev, USB_DT_DEVICE, 0,
				&dev->descriptor, sizeof(dev->descriptor));
		config = dev->actconfig;
		if (err < 0)
			dev_dbg(&dev->dev, "error usb_get_descriptor: %d\n", err);
		err = usb_reset_configuration(dev);
		if (err < 0)
			dev_dbg(&dev->dev, "error usb_reset_configuration: %d\n", err);
		dev_dbg(&dev->dev, "extigy_boot: new boot length = %d\n",
			    le16_to_cpu(get_cfg_desc(config)->wTotalLength));
		return -ENODEV; /* quit this anyway */
	}
	return 0;
}

static int snd_usb_audigy2nx_boot_quirk(struct usb_device *dev)
{
	u8 buf = 1;

	snd_usb_ctl_msg(dev, usb_rcvctrlpipe(dev, 0), 0x2a,
			USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_OTHER,
			0, 0, &buf, 1);
	if (buf == 0) {
		snd_usb_ctl_msg(dev, usb_sndctrlpipe(dev, 0), 0x29,
				USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_OTHER,
				1, 2000, NULL, 0);
		return -ENODEV;
	}
	return 0;
}

static int snd_usb_fasttrackpro_boot_quirk(struct usb_device *dev)
{
	int err;

	if (dev->actconfig->desc.bConfigurationValue == 1) {
		dev_info(&dev->dev,
			   "Fast Track Pro switching to config #2\n");
		/* This function has to be available by the usb core module.
		 * if it is not avialable the boot quirk has to be left out
		 * and the configuration has to be set by udev or hotplug
		 * rules
		 */
		err = usb_driver_set_configuration(dev, 2);
		if (err < 0)
			dev_dbg(&dev->dev,
				"error usb_driver_set_configuration: %d\n",
				err);
		/* Always return an error, so that we stop creating a device
		   that will just be destroyed and recreated with a new
		   configuration */
		return -ENODEV;
	} else
		dev_info(&dev->dev, "Fast Track Pro config OK\n");

	return 0;
}

/*
 * C-Media CM106/CM106+ have four 16-bit internal registers that are nicely
 * documented in the device's data sheet.
 */
static int snd_usb_cm106_write_int_reg(struct usb_device *dev, int reg, u16 value)
{
	u8 buf[4];
	buf[0] = 0x20;
	buf[1] = value & 0xff;
	buf[2] = (value >> 8) & 0xff;
	buf[3] = reg;
	return snd_usb_ctl_msg(dev, usb_sndctrlpipe(dev, 0), USB_REQ_SET_CONFIGURATION,
			       USB_DIR_OUT | USB_TYPE_CLASS | USB_RECIP_ENDPOINT,
			       0, 0, &buf, 4);
}

static int snd_usb_cm106_boot_quirk(struct usb_device *dev)
{
	/*
	 * Enable line-out driver mode, set headphone source to front
	 * channels, enable stereo mic.
	 */
	return snd_usb_cm106_write_int_reg(dev, 2, 0x8004);
}

/*
 * C-Media CM6206 is based on CM106 with two additional
 * registers that are not documented in the data sheet.
 * Values here are chosen based on sniffing USB traffic
 * under Windows.
 */
static int snd_usb_cm6206_boot_quirk(struct usb_device *dev)
{
	int err  = 0, reg;
	int val[] = {0x2004, 0x3000, 0xf800, 0x143f, 0x0000, 0x3000};

	for (reg = 0; reg < ARRAY_SIZE(val); reg++) {
		err = snd_usb_cm106_write_int_reg(dev, reg, val[reg]);
		if (err < 0)
			return err;
	}

	return err;
}

/* quirk for Plantronics GameCom 780 with CM6302 chip */
static int snd_usb_gamecon780_boot_quirk(struct usb_device *dev)
{
	/* set the initial volume and don't change; other values are either
	 * too loud or silent due to firmware bug (bko#65251)
	 */
	u8 buf[2] = { 0x74, 0xe3 };
	return snd_usb_ctl_msg(dev, usb_sndctrlpipe(dev, 0), UAC_SET_CUR,
			USB_RECIP_INTERFACE | USB_TYPE_CLASS | USB_DIR_OUT,
			UAC_FU_VOLUME << 8, 9 << 8, buf, 2);
}

/*
 * Novation Twitch DJ controller
 * Focusrite Novation Saffire 6 USB audio card
 */
static int snd_usb_novation_boot_quirk(struct usb_device *dev)
{
	/* preemptively set up the device because otherwise the
	 * raw MIDI endpoints are not active */
	usb_set_interface(dev, 0, 1);
	return 0;
}

/*
 * This call will put the synth in "USB send" mode, i.e it will send MIDI
 * messages through USB (this is disabled at startup). The synth will
 * acknowledge by sending a sysex on endpoint 0x85 and by displaying a USB
 * sign on its LCD. Values here are chosen based on sniffing USB traffic
 * under Windows.
 */
static int snd_usb_accessmusic_boot_quirk(struct usb_device *dev)
{
	int err, actual_length;

	/* "midi send" enable */
	static const u8 seq[] = { 0x4e, 0x73, 0x52, 0x01 };

	void *buf = kmemdup(seq, ARRAY_SIZE(seq), GFP_KERNEL);
	if (!buf)
		return -ENOMEM;
	err = usb_interrupt_msg(dev, usb_sndintpipe(dev, 0x05), buf,
			ARRAY_SIZE(seq), &actual_length, 1000);
	kfree(buf);
	if (err < 0)
		return err;

	return 0;
}

/*
 * Some sound cards from Native Instruments are in fact compliant to the USB
 * audio standard of version 2 and other approved USB standards, even though
 * they come up as vendor-specific device when first connected.
 *
 * However, they can be told to come up with a new set of descriptors
 * upon their next enumeration, and the interfaces announced by the new
 * descriptors will then be handled by the kernel's class drivers. As the
 * product ID will also change, no further checks are required.
 */

static int snd_usb_nativeinstruments_boot_quirk(struct usb_device *dev)
{
	int ret = usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
				  0xaf, USB_TYPE_VENDOR | USB_RECIP_DEVICE,
				  1, 0, NULL, 0, 1000);

	if (ret < 0)
		return ret;

	usb_reset_device(dev);

	/* return -EAGAIN, so the creation of an audio interface for this
	 * temporary device is aborted. The device will reconnect with a
	 * new product ID */
	return -EAGAIN;
}

static void mbox2_setup_48_24_magic(struct usb_device *dev)
{
	u8 srate[3];
	u8 temp[12];

	/* Choose 48000Hz permanently */
	srate[0] = 0x80;
	srate[1] = 0xbb;
	srate[2] = 0x00;

	/* Send the magic! */
	snd_usb_ctl_msg(dev, usb_rcvctrlpipe(dev, 0),
		0x01, 0x22, 0x0100, 0x0085, &temp, 0x0003);
	snd_usb_ctl_msg(dev, usb_sndctrlpipe(dev, 0),
		0x81, 0xa2, 0x0100, 0x0085, &srate, 0x0003);
	snd_usb_ctl_msg(dev, usb_sndctrlpipe(dev, 0),
		0x81, 0xa2, 0x0100, 0x0086, &srate, 0x0003);
	snd_usb_ctl_msg(dev, usb_sndctrlpipe(dev, 0),
		0x81, 0xa2, 0x0100, 0x0003, &srate, 0x0003);
	return;
}

/* Digidesign Mbox 2 needs to load firmware onboard
 * and driver must wait a few seconds for initialisation.
 */

#define MBOX2_FIRMWARE_SIZE    646
#define MBOX2_BOOT_LOADING     0x01 /* Hard coded into the device */
#define MBOX2_BOOT_READY       0x02 /* Hard coded into the device */

static int snd_usb_mbox2_boot_quirk(struct usb_device *dev)
{
	struct usb_host_config *config = dev->actconfig;
	int err;
	u8 bootresponse[0x12];
	int fwsize;
	int count;

	fwsize = le16_to_cpu(get_cfg_desc(config)->wTotalLength);

	if (fwsize != MBOX2_FIRMWARE_SIZE) {
		dev_err(&dev->dev, "Invalid firmware size=%d.\n", fwsize);
		return -ENODEV;
	}

	dev_dbg(&dev->dev, "Sending Digidesign Mbox 2 boot sequence...\n");

	count = 0;
	bootresponse[0] = MBOX2_BOOT_LOADING;
	while ((bootresponse[0] == MBOX2_BOOT_LOADING) && (count < 10)) {
		msleep(500); /* 0.5 second delay */
		snd_usb_ctl_msg(dev, usb_rcvctrlpipe(dev, 0),
			/* Control magic - load onboard firmware */
			0x85, 0xc0, 0x0001, 0x0000, &bootresponse, 0x0012);
		if (bootresponse[0] == MBOX2_BOOT_READY)
			break;
		dev_dbg(&dev->dev, "device not ready, resending boot sequence...\n");
		count++;
	}

	if (bootresponse[0] != MBOX2_BOOT_READY) {
		dev_err(&dev->dev, "Unknown bootresponse=%d, or timed out, ignoring device.\n", bootresponse[0]);
		return -ENODEV;
	}

	dev_dbg(&dev->dev, "device initialised!\n");

	err = usb_get_descriptor(dev, USB_DT_DEVICE, 0,
		&dev->descriptor, sizeof(dev->descriptor));
	config = dev->actconfig;
	if (err < 0)
		dev_dbg(&dev->dev, "error usb_get_descriptor: %d\n", err);

	err = usb_reset_configuration(dev);
	if (err < 0)
		dev_dbg(&dev->dev, "error usb_reset_configuration: %d\n", err);
	dev_dbg(&dev->dev, "mbox2_boot: new boot length = %d\n",
		le16_to_cpu(get_cfg_desc(config)->wTotalLength));

	mbox2_setup_48_24_magic(dev);

	dev_info(&dev->dev, "Digidesign Mbox 2: 24bit 48kHz");

	return 0; /* Successful boot */
}

/*
 * Setup quirks
 */
#define MAUDIO_SET		0x01 /* parse device_setup */
#define MAUDIO_SET_COMPATIBLE	0x80 /* use only "win-compatible" interfaces */
#define MAUDIO_SET_DTS		0x02 /* enable DTS Digital Output */
#define MAUDIO_SET_96K		0x04 /* 48-96KHz rate if set, 8-48KHz otherwise */
#define MAUDIO_SET_24B		0x08 /* 24bits sample if set, 16bits otherwise */
#define MAUDIO_SET_DI		0x10 /* enable Digital Input */
#define MAUDIO_SET_MASK		0x1f /* bit mask for setup value */
#define MAUDIO_SET_24B_48K_DI	 0x19 /* 24bits+48KHz+Digital Input */
#define MAUDIO_SET_24B_48K_NOTDI 0x09 /* 24bits+48KHz+No Digital Input */
#define MAUDIO_SET_16B_48K_DI	 0x11 /* 16bits+48KHz+Digital Input */
#define MAUDIO_SET_16B_48K_NOTDI 0x01 /* 16bits+48KHz+No Digital Input */

static int quattro_skip_setting_quirk(struct snd_usb_audio *chip,
				      int iface, int altno)
{
	/* Reset ALL ifaces to 0 altsetting.
	 * Call it for every possible altsetting of every interface.
	 */
	usb_set_interface(chip->dev, iface, 0);
	if (chip->setup & MAUDIO_SET) {
		if (chip->setup & MAUDIO_SET_COMPATIBLE) {
			if (iface != 1 && iface != 2)
				return 1; /* skip all interfaces but 1 and 2 */
		} else {
			unsigned int mask;
			if (iface == 1 || iface == 2)
				return 1; /* skip interfaces 1 and 2 */
			if ((chip->setup & MAUDIO_SET_96K) && altno != 1)
				return 1; /* skip this altsetting */
			mask = chip->setup & MAUDIO_SET_MASK;
			if (mask == MAUDIO_SET_24B_48K_DI && altno != 2)
				return 1; /* skip this altsetting */
			if (mask == MAUDIO_SET_24B_48K_NOTDI && altno != 3)
				return 1; /* skip this altsetting */
			if (mask == MAUDIO_SET_16B_48K_NOTDI && altno != 4)
				return 1; /* skip this altsetting */
		}
	}
	usb_audio_dbg(chip,
		    "using altsetting %d for interface %d config %d\n",
		    altno, iface, chip->setup);
	return 0; /* keep this altsetting */
}

static int audiophile_skip_setting_quirk(struct snd_usb_audio *chip,
					 int iface,
					 int altno)
{
	/* Reset ALL ifaces to 0 altsetting.
	 * Call it for every possible altsetting of every interface.
	 */
	usb_set_interface(chip->dev, iface, 0);

	if (chip->setup & MAUDIO_SET) {
		unsigned int mask;
		if ((chip->setup & MAUDIO_SET_DTS) && altno != 6)
			return 1; /* skip this altsetting */
		if ((chip->setup & MAUDIO_SET_96K) && altno != 1)
			return 1; /* skip this altsetting */
		mask = chip->setup & MAUDIO_SET_MASK;
		if (mask == MAUDIO_SET_24B_48K_DI && altno != 2)
			return 1; /* skip this altsetting */
		if (mask == MAUDIO_SET_24B_48K_NOTDI && altno != 3)
			return 1; /* skip this altsetting */
		if (mask == MAUDIO_SET_16B_48K_DI && altno != 4)
			return 1; /* skip this altsetting */
		if (mask == MAUDIO_SET_16B_48K_NOTDI && altno != 5)
			return 1; /* skip this altsetting */
	}

	return 0; /* keep this altsetting */
}

static int fasttrackpro_skip_setting_quirk(struct snd_usb_audio *chip,
					   int iface, int altno)
{
	/* Reset ALL ifaces to 0 altsetting.
	 * Call it for every possible altsetting of every interface.
	 */
	usb_set_interface(chip->dev, iface, 0);

	/* possible configuration where both inputs and only one output is
	 *used is not supported by the current setup
	 */
	if (chip->setup & (MAUDIO_SET | MAUDIO_SET_24B)) {
		if (chip->setup & MAUDIO_SET_96K) {
			if (altno != 3 && altno != 6)
				return 1;
		} else if (chip->setup & MAUDIO_SET_DI) {
			if (iface == 4)
				return 1; /* no analog input */
			if (altno != 2 && altno != 5)
				return 1; /* enable only altsets 2 and 5 */
		} else {
			if (iface == 5)
				return 1; /* disable digialt input */
			if (altno != 2 && altno != 5)
				return 1; /* enalbe only altsets 2 and 5 */
		}
	} else {
		/* keep only 16-Bit mode */
		if (altno != 1)
			return 1;
	}

	usb_audio_dbg(chip,
		    "using altsetting %d for interface %d config %d\n",
		    altno, iface, chip->setup);
	return 0; /* keep this altsetting */
}

int snd_usb_apply_interface_quirk(struct snd_usb_audio *chip,
				  int iface,
				  int altno)
{
	/* audiophile usb: skip altsets incompatible with device_setup */
	if (chip->usb_id == USB_ID(0x0763, 0x2003))
		return audiophile_skip_setting_quirk(chip, iface, altno);
	/* quattro usb: skip altsets incompatible with device_setup */
	if (chip->usb_id == USB_ID(0x0763, 0x2001))
		return quattro_skip_setting_quirk(chip, iface, altno);
	/* fasttrackpro usb: skip altsets incompatible with device_setup */
	if (chip->usb_id == USB_ID(0x0763, 0x2012))
		return fasttrackpro_skip_setting_quirk(chip, iface, altno);

	return 0;
}

int snd_usb_apply_boot_quirk(struct usb_device *dev,
			     struct usb_interface *intf,
			     const struct snd_usb_audio_quirk *quirk,
			     unsigned int id)
{
	switch (id) {
	case USB_ID(0x041e, 0x3000):
		/* SB Extigy needs special boot-up sequence */
		/* if more models come, this will go to the quirk list. */
		return snd_usb_extigy_boot_quirk(dev, intf);

	case USB_ID(0x041e, 0x3020):
		/* SB Audigy 2 NX needs its own boot-up magic, too */
		return snd_usb_audigy2nx_boot_quirk(dev);

	case USB_ID(0x10f5, 0x0200):
		/* C-Media CM106 / Turtle Beach Audio Advantage Roadie */
		return snd_usb_cm106_boot_quirk(dev);

	case USB_ID(0x0d8c, 0x0102):
		/* C-Media CM6206 / CM106-Like Sound Device */
	case USB_ID(0x0ccd, 0x00b1): /* Terratec Aureon 7.1 USB */
		return snd_usb_cm6206_boot_quirk(dev);

	case USB_ID(0x0dba, 0x3000):
		/* Digidesign Mbox 2 */
		return snd_usb_mbox2_boot_quirk(dev);

	case USB_ID(0x1235, 0x0010): /* Focusrite Novation Saffire 6 USB */
	case USB_ID(0x1235, 0x0018): /* Focusrite Novation Twitch */
		return snd_usb_novation_boot_quirk(dev);

	case USB_ID(0x133e, 0x0815):
		/* Access Music VirusTI Desktop */
		return snd_usb_accessmusic_boot_quirk(dev);

	case USB_ID(0x17cc, 0x1000): /* Komplete Audio 6 */
	case USB_ID(0x17cc, 0x1010): /* Traktor Audio 6 */
	case USB_ID(0x17cc, 0x1020): /* Traktor Audio 10 */
		return snd_usb_nativeinstruments_boot_quirk(dev);
	case USB_ID(0x0763, 0x2012):  /* M-Audio Fast Track Pro USB */
		return snd_usb_fasttrackpro_boot_quirk(dev);
	case USB_ID(0x047f, 0xc010): /* Plantronics Gamecom 780 */
		return snd_usb_gamecon780_boot_quirk(dev);
	}

	return 0;
}

/*
 * check if the device uses big-endian samples
 */
int snd_usb_is_big_endian_format(struct snd_usb_audio *chip, struct audioformat *fp)
{
	/* it depends on altsetting whether the device is big-endian or not */
	switch (chip->usb_id) {
	case USB_ID(0x0763, 0x2001): /* M-Audio Quattro: captured data only */
		if (fp->altsetting == 2 || fp->altsetting == 3 ||
			fp->altsetting == 5 || fp->altsetting == 6)
			return 1;
		break;
	case USB_ID(0x0763, 0x2003): /* M-Audio Audiophile USB */
		if (chip->setup == 0x00 ||
			fp->altsetting == 1 || fp->altsetting == 2 ||
			fp->altsetting == 3)
			return 1;
		break;
	case USB_ID(0x0763, 0x2012): /* M-Audio Fast Track Pro */
		if (fp->altsetting == 2 || fp->altsetting == 3 ||
			fp->altsetting == 5 || fp->altsetting == 6)
			return 1;
		break;
	}
	return 0;
}

/*
 * For E-Mu 0404USB/0202USB/TrackerPre/0204 sample rate should be set for device,
 * not for interface.
 */

enum {
	EMU_QUIRK_SR_44100HZ = 0,
	EMU_QUIRK_SR_48000HZ,
	EMU_QUIRK_SR_88200HZ,
	EMU_QUIRK_SR_96000HZ,
	EMU_QUIRK_SR_176400HZ,
	EMU_QUIRK_SR_192000HZ
};

static void set_format_emu_quirk(struct snd_usb_substream *subs,
				 struct audioformat *fmt)
{
	unsigned char emu_samplerate_id = 0;

	/* When capture is active
	 * sample rate shouldn't be changed
	 * by playback substream
	 */
	if (subs->direction == SNDRV_PCM_STREAM_PLAYBACK) {
		if (subs->stream->substream[SNDRV_PCM_STREAM_CAPTURE].interface != -1)
			return;
	}

	switch (fmt->rate_min) {
	case 48000:
		emu_samplerate_id = EMU_QUIRK_SR_48000HZ;
		break;
	case 88200:
		emu_samplerate_id = EMU_QUIRK_SR_88200HZ;
		break;
	case 96000:
		emu_samplerate_id = EMU_QUIRK_SR_96000HZ;
		break;
	case 176400:
		emu_samplerate_id = EMU_QUIRK_SR_176400HZ;
		break;
	case 192000:
		emu_samplerate_id = EMU_QUIRK_SR_192000HZ;
		break;
	default:
		emu_samplerate_id = EMU_QUIRK_SR_44100HZ;
		break;
	}
	snd_emuusb_set_samplerate(subs->stream->chip, emu_samplerate_id);
	subs->pkt_offset_adj = (emu_samplerate_id >= EMU_QUIRK_SR_176400HZ) ? 4 : 0;
}

void snd_usb_set_format_quirk(struct snd_usb_substream *subs,
			      struct audioformat *fmt)
{
	switch (subs->stream->chip->usb_id) {
	case USB_ID(0x041e, 0x3f02): /* E-Mu 0202 USB */
	case USB_ID(0x041e, 0x3f04): /* E-Mu 0404 USB */
	case USB_ID(0x041e, 0x3f0a): /* E-Mu Tracker Pre */
	case USB_ID(0x041e, 0x3f19): /* E-Mu 0204 USB */
		set_format_emu_quirk(subs, fmt);
		break;
	}
}

bool snd_usb_get_sample_rate_quirk(struct snd_usb_audio *chip)
{
	/* devices which do not support reading the sample rate. */
	switch (chip->usb_id) {
	case USB_ID(0x045E, 0x075D): /* MS Lifecam Cinema  */
	case USB_ID(0x045E, 0x076D): /* MS Lifecam HD-5000 */
	case USB_ID(0x045E, 0x076E): /* MS Lifecam HD-5001 */
	case USB_ID(0x045E, 0x076F): /* MS Lifecam HD-6000 */
	case USB_ID(0x045E, 0x0772): /* MS Lifecam Studio */
	case USB_ID(0x045E, 0x0779): /* MS Lifecam HD-3000 */
	case USB_ID(0x047F, 0x0415): /* Plantronics BT-300 */
	case USB_ID(0x047F, 0xAA05): /* Plantronics DA45 */
	case USB_ID(0x04D8, 0xFEEA): /* Benchmark DAC1 Pre */
	case USB_ID(0x0556, 0x0014): /* Phoenix Audio TMX320VC */
	case USB_ID(0x074D, 0x3553): /* Outlaw RR2150 (Micronas UAC3553B) */
	case USB_ID(0x1de7, 0x0013): /* Phoenix Audio MT202exe */
	case USB_ID(0x1de7, 0x0014): /* Phoenix Audio TMX320 */
	case USB_ID(0x1de7, 0x0114): /* Phoenix Audio MT202pcs */
	case USB_ID(0x21B4, 0x0081): /* AudioQuest DragonFly */
		return true;
	}
	return false;
}

/* Marantz/Denon USB DACs need a vendor cmd to switch
 * between PCM and native DSD mode
 */
static bool is_marantz_denon_dac(unsigned int id)
{
	switch (id) {
	case USB_ID(0x154e, 0x1003): /* Denon DA-300USB */
	case USB_ID(0x154e, 0x3005): /* Marantz HD-DAC1 */
	case USB_ID(0x154e, 0x3006): /* Marantz SA-14S1 */
		return true;
	}
	return false;
}

int snd_usb_select_mode_quirk(struct snd_usb_substream *subs,
			      struct audioformat *fmt)
{
	struct usb_device *dev = subs->dev;
	int err;

	if (is_marantz_denon_dac(subs->stream->chip->usb_id)) {
		/* First switch to alt set 0, otherwise the mode switch cmd
		 * will not be accepted by the DAC
		 */
		err = usb_set_interface(dev, fmt->iface, 0);
		if (err < 0)
			return err;

		mdelay(20); /* Delay needed after setting the interface */

		switch (fmt->altsetting) {
		case 2: /* DSD mode requested */
		case 1: /* PCM mode requested */
			err = snd_usb_ctl_msg(dev, usb_sndctrlpipe(dev, 0), 0,
					      USB_DIR_OUT|USB_TYPE_VENDOR|USB_RECIP_INTERFACE,
					      fmt->altsetting - 1, 1, NULL, 0);
			if (err < 0)
				return err;
			break;
		}
		mdelay(20);
	}
	return 0;
}

void snd_usb_endpoint_start_quirk(struct snd_usb_endpoint *ep)
{
	/*
	 * "Playback Design" products send bogus feedback data at the start
	 * of the stream. Ignore them.
	 */
	if (USB_ID_VENDOR(ep->chip->usb_id) == 0x23ba &&
	    ep->type == SND_USB_ENDPOINT_TYPE_SYNC)
		ep->skip_packets = 4;

	/*
	 * M-Audio Fast Track C400/C600 - when packets are not skipped, real
	 * world latency varies by approx. +/- 50 frames (at 96KHz) each time
	 * the stream is (re)started. When skipping packets 16 at endpoint
	 * start up, the real world latency is stable within +/- 1 frame (also
	 * across power cycles).
	 */
	if ((ep->chip->usb_id == USB_ID(0x0763, 0x2030) ||
	     ep->chip->usb_id == USB_ID(0x0763, 0x2031)) &&
	    ep->type == SND_USB_ENDPOINT_TYPE_DATA)
		ep->skip_packets = 16;
}

void snd_usb_set_interface_quirk(struct usb_device *dev)
{
	struct snd_usb_audio *chip = dev_get_drvdata(&dev->dev);

	if (!chip)
		return;
	/*
	 * "Playback Design" products need a 50ms delay after setting the
	 * USB interface.
	 */
	switch (USB_ID_VENDOR(chip->usb_id)) {
	case 0x23ba: /* Playback Design */
	case 0x0644: /* TEAC Corp. */
		mdelay(50);
		break;
	}
}

/* quirk applied after snd_usb_ctl_msg(); not applied during boot quirks */
void snd_usb_ctl_msg_quirk(struct usb_device *dev, unsigned int pipe,
			   __u8 request, __u8 requesttype, __u16 value,
			   __u16 index, void *data, __u16 size)
{
	struct snd_usb_audio *chip = dev_get_drvdata(&dev->dev);

	if (!chip)
		return;
	/*
	 * "Playback Design" products need a 20ms delay after each
	 * class compliant request
	 */
	if (USB_ID_VENDOR(chip->usb_id) == 0x23ba &&
	    (requesttype & USB_TYPE_MASK) == USB_TYPE_CLASS)
		mdelay(20);

	/*
	 * "TEAC Corp." products need a 20ms delay after each
	 * class compliant request
	 */
	if (USB_ID_VENDOR(chip->usb_id) == 0x0644 &&
	    (requesttype & USB_TYPE_MASK) == USB_TYPE_CLASS)
		mdelay(20);

	/* Marantz/Denon devices with USB DAC functionality need a delay
	 * after each class compliant request
	 */
	if (is_marantz_denon_dac(chip->usb_id)
	    && (requesttype & USB_TYPE_MASK) == USB_TYPE_CLASS)
		mdelay(20);

	/* Zoom R16/24 needs a tiny delay here, otherwise requests like
	 * get/set frequency return as failed despite actually succeeding.
	 */
	if (chip->usb_id == USB_ID(0x1686, 0x00dd) &&
	    (requesttype & USB_TYPE_MASK) == USB_TYPE_CLASS)
		mdelay(1);
}

/*
 * snd_usb_interface_dsd_format_quirks() is called from format.c to
 * augment the PCM format bit-field for DSD types. The UAC standards
 * don't have a designated bit field to denote DSD-capable interfaces,
 * hence all hardware that is known to support this format has to be
 * listed here.
 */
u64 snd_usb_interface_dsd_format_quirks(struct snd_usb_audio *chip,
					struct audioformat *fp,
					unsigned int sample_bytes)
{
	/* Playback Designs */
	if (USB_ID_VENDOR(chip->usb_id) == 0x23ba) {
		switch (fp->altsetting) {
		case 1:
			fp->dsd_dop = true;
			return SNDRV_PCM_FMTBIT_DSD_U16_LE;
		case 2:
			fp->dsd_bitrev = true;
			return SNDRV_PCM_FMTBIT_DSD_U8;
		case 3:
			fp->dsd_bitrev = true;
			return SNDRV_PCM_FMTBIT_DSD_U16_LE;
		}
	}

	/* XMOS based USB DACs */
	switch (chip->usb_id) {
	case USB_ID(0x20b1, 0x3008): /* iFi Audio micro/nano iDSD */
	case USB_ID(0x20b1, 0x2008): /* Matrix Audio X-Sabre */
	case USB_ID(0x20b1, 0x300a): /* Matrix Audio Mini-i Pro */
	case USB_ID(0x22d9, 0x0416): /* OPPO HA-1 */
		if (fp->altsetting == 2)
			return SNDRV_PCM_FMTBIT_DSD_U32_BE;
		break;

	case USB_ID(0x20b1, 0x000a): /* Gustard DAC-X20U */
	case USB_ID(0x20b1, 0x2009): /* DIYINHK DSD DXD 384kHz USB to I2S/DSD */
	case USB_ID(0x20b1, 0x2023): /* JLsounds I2SoverUSB */
	case USB_ID(0x20b1, 0x3023): /* Aune X1S 32BIT/384 DSD DAC */
	case USB_ID(0x2616, 0x0106): /* PS Audio NuWave DAC */
		if (fp->altsetting == 3)
			return SNDRV_PCM_FMTBIT_DSD_U32_BE;
		break;
	default:
		break;
	}

	/* Denon/Marantz devices with USB DAC functionality */
	if (is_marantz_denon_dac(chip->usb_id)) {
		if (fp->altsetting == 2)
			return SNDRV_PCM_FMTBIT_DSD_U32_BE;
	}

	return 0;
}