summaryrefslogtreecommitdiffstats
path: root/sound/usb/usbmixer.c
blob: ec880ff5262517c6f2c78ec96d2846b81bc8c4be (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
1839
1840
1841
1842
1843
1844
1845
1846
1847
1848
1849
1850
1851
1852
1853
1854
1855
1856
1857
1858
1859
1860
1861
1862
1863
1864
1865
1866
1867
1868
1869
1870
1871
1872
1873
1874
1875
1876
1877
1878
1879
1880
1881
1882
1883
1884
1885
1886
1887
1888
1889
1890
1891
1892
1893
1894
1895
1896
1897
1898
1899
1900
1901
1902
1903
1904
1905
1906
1907
1908
1909
1910
1911
1912
1913
1914
1915
1916
1917
1918
1919
1920
1921
1922
1923
1924
1925
1926
1927
1928
1929
1930
1931
1932
1933
1934
1935
1936
1937
1938
1939
1940
1941
1942
1943
1944
1945
1946
1947
1948
1949
1950
1951
1952
1953
1954
1955
1956
1957
1958
1959
1960
1961
1962
1963
1964
1965
1966
1967
1968
1969
1970
1971
1972
1973
1974
1975
1976
1977
1978
1979
1980
1981
1982
1983
1984
1985
1986
/*
 *   (Tentative) USB Audio Driver for ALSA
 *
 *   Mixer control part
 *
 *   Copyright (c) 2002 by Takashi Iwai <tiwai@suse.de>
 *
 *   Many codes borrowed from audio.c by
 *	    Alan Cox (alan@lxorguk.ukuu.org.uk)
 *	    Thomas Sailer (sailer@ife.ee.ethz.ch)
 *
 *
 *   This program is free software; you can redistribute it and/or modify
 *   it under the terms of the GNU General Public License as published by
 *   the Free Software Foundation; either version 2 of the License, or
 *   (at your option) any later version.
 *
 *   This program is distributed in the hope that it will be useful,
 *   but WITHOUT ANY WARRANTY; without even the implied warranty of
 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *   GNU General Public License for more details.
 *
 *   You should have received a copy of the GNU General Public License
 *   along with this program; if not, write to the Free Software
 *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
 *
 */

#include <sound/driver.h>
#include <linux/bitops.h>
#include <linux/init.h>
#include <linux/list.h>
#include <linux/slab.h>
#include <linux/string.h>
#include <linux/usb.h>
#include <sound/core.h>
#include <sound/control.h>
#include <sound/hwdep.h>

#include "usbaudio.h"

#if 0
#include <linux/lirc.h>
#else
/* only those symbols from lirc.h we actually need: */
#include <linux/ioctl.h>
#define LIRC_MODE2REC(x)	((x) << 16)
#define LIRC_MODE_CODE		0x00000008
#define LIRC_CAN_REC_CODE	LIRC_MODE2REC(LIRC_MODE_CODE)
#define LIRC_GET_FEATURES	_IOR('i', 0x00000000, __u32)
#define LIRC_GET_REC_MODE	_IOR('i', 0x00000002, __u32)
#define LIRC_SET_REC_MODE	_IOW('i', 0x00000012, __u32)
#endif

/*
 */

/* ignore error from controls - for debugging */
/* #define IGNORE_CTL_ERROR */

typedef struct usb_mixer_build mixer_build_t;
typedef struct usb_audio_term usb_audio_term_t;
typedef struct usb_mixer_elem_info usb_mixer_elem_info_t;


struct usb_mixer_interface {
	snd_usb_audio_t *chip;
	unsigned int ctrlif;
	struct list_head list;
	unsigned int ignore_ctl_error;
	struct urb *urb;
	usb_mixer_elem_info_t **id_elems; /* array[256], indexed by unit id */

	/* Sound Blaster remote control stuff */
	enum {
		RC_NONE,
		RC_EXTIGY,
		RC_AUDIGY2NX,
	} rc_type;
	unsigned long rc_hwdep_open;
	u32 rc_code;
	wait_queue_head_t rc_waitq;
	struct urb *rc_urb;
	struct usb_ctrlrequest *rc_setup_packet;
	u8 rc_buffer[6];

	u8 audigy2nx_leds[3];
};


struct usb_audio_term {
	int id;
	int type;
	int channels;
	unsigned int chconfig;
	int name;
};

struct usbmix_name_map;

struct usb_mixer_build {
	snd_usb_audio_t *chip;
	struct usb_mixer_interface *mixer;
	unsigned char *buffer;
	unsigned int buflen;
	DECLARE_BITMAP(unitbitmap, 256);
	usb_audio_term_t oterm;
	const struct usbmix_name_map *map;
	const struct usbmix_selector_map *selector_map;
};

struct usb_mixer_elem_info {
	struct usb_mixer_interface *mixer;
	usb_mixer_elem_info_t *next_id_elem; /* list of controls with same id */
	snd_ctl_elem_id_t *elem_id;
	unsigned int id;
	unsigned int control;	/* CS or ICN (high byte) */
	unsigned int cmask; /* channel mask bitmap: 0 = master */
	int channels;
	int val_type;
	int min, max, res;
	u8 initialized;
};


enum {
	USB_FEATURE_NONE = 0,
	USB_FEATURE_MUTE = 1,
	USB_FEATURE_VOLUME,
	USB_FEATURE_BASS,
	USB_FEATURE_MID,
	USB_FEATURE_TREBLE,
	USB_FEATURE_GEQ,
	USB_FEATURE_AGC,
	USB_FEATURE_DELAY,
	USB_FEATURE_BASSBOOST,
	USB_FEATURE_LOUDNESS
};

enum {
	USB_MIXER_BOOLEAN,
	USB_MIXER_INV_BOOLEAN,
	USB_MIXER_S8,
	USB_MIXER_U8,
	USB_MIXER_S16,
	USB_MIXER_U16,
};

enum {
	USB_PROC_UPDOWN = 1,
	USB_PROC_UPDOWN_SWITCH = 1,
	USB_PROC_UPDOWN_MODE_SEL = 2,

	USB_PROC_PROLOGIC = 2,
	USB_PROC_PROLOGIC_SWITCH = 1,
	USB_PROC_PROLOGIC_MODE_SEL = 2,

	USB_PROC_3DENH = 3,
	USB_PROC_3DENH_SWITCH = 1,
	USB_PROC_3DENH_SPACE = 2,

	USB_PROC_REVERB = 4,
	USB_PROC_REVERB_SWITCH = 1,
	USB_PROC_REVERB_LEVEL = 2,
	USB_PROC_REVERB_TIME = 3,
	USB_PROC_REVERB_DELAY = 4,

	USB_PROC_CHORUS = 5,
	USB_PROC_CHORUS_SWITCH = 1,
	USB_PROC_CHORUS_LEVEL = 2,
	USB_PROC_CHORUS_RATE = 3,
	USB_PROC_CHORUS_DEPTH = 4,

	USB_PROC_DCR = 6,
	USB_PROC_DCR_SWITCH = 1,
	USB_PROC_DCR_RATIO = 2,
	USB_PROC_DCR_MAX_AMP = 3,
	USB_PROC_DCR_THRESHOLD = 4,
	USB_PROC_DCR_ATTACK = 5,
	USB_PROC_DCR_RELEASE = 6,
};

#define MAX_CHANNELS	10	/* max logical channels */


/*
 * manual mapping of mixer names
 * if the mixer topology is too complicated and the parsed names are
 * ambiguous, add the entries in usbmixer_maps.c.
 */
#include "usbmixer_maps.c"

/* get the mapped name if the unit matches */
static int check_mapped_name(mixer_build_t *state, int unitid, int control, char *buf, int buflen)
{
	const struct usbmix_name_map *p;

	if (! state->map)
		return 0;

	for (p = state->map; p->id; p++) {
		if (p->id == unitid && p->name &&
		    (! control || ! p->control || control == p->control)) {
			buflen--;
			return strlcpy(buf, p->name, buflen);
		}
	}
	return 0;
}

/* check whether the control should be ignored */
static int check_ignored_ctl(mixer_build_t *state, int unitid, int control)
{
	const struct usbmix_name_map *p;

	if (! state->map)
		return 0;
	for (p = state->map; p->id; p++) {
		if (p->id == unitid && ! p->name &&
		    (! control || ! p->control || control == p->control)) {
			// printk("ignored control %d:%d\n", unitid, control);
			return 1;
		}
	}
	return 0;
}

/* get the mapped selector source name */
static int check_mapped_selector_name(mixer_build_t *state, int unitid,
				      int index, char *buf, int buflen)
{
	const struct usbmix_selector_map *p;

	if (! state->selector_map)
		return 0;
	for (p = state->selector_map; p->id; p++) {
		if (p->id == unitid && index < p->count)
			return strlcpy(buf, p->names[index], buflen);
	}
	return 0;
}

/*
 * find an audio control unit with the given unit id
 */
static void *find_audio_control_unit(mixer_build_t *state, unsigned char unit)
{
	unsigned char *p;

	p = NULL;
	while ((p = snd_usb_find_desc(state->buffer, state->buflen, p,
				      USB_DT_CS_INTERFACE)) != NULL) {
		if (p[0] >= 4 && p[2] >= INPUT_TERMINAL && p[2] <= EXTENSION_UNIT && p[3] == unit)
			return p;
	}
	return NULL;
}


/*
 * copy a string with the given id
 */
static int snd_usb_copy_string_desc(mixer_build_t *state, int index, char *buf, int maxlen)
{
	int len = usb_string(state->chip->dev, index, buf, maxlen - 1);
	buf[len] = 0;
	return len;
}

/*
 * convert from the byte/word on usb descriptor to the zero-based integer
 */
static int convert_signed_value(usb_mixer_elem_info_t *cval, int val)
{
	switch (cval->val_type) {
	case USB_MIXER_BOOLEAN:
		return !!val;
	case USB_MIXER_INV_BOOLEAN:
		return !val;
	case USB_MIXER_U8:
		val &= 0xff;
		break;
	case USB_MIXER_S8:
		val &= 0xff;
		if (val >= 0x80)
			val -= 0x100;
		break;
	case USB_MIXER_U16:
		val &= 0xffff;
		break;
	case USB_MIXER_S16:
		val &= 0xffff;
		if (val >= 0x8000)
			val -= 0x10000;
		break;
	}
	return val;
}

/*
 * convert from the zero-based int to the byte/word for usb descriptor
 */
static int convert_bytes_value(usb_mixer_elem_info_t *cval, int val)
{
	switch (cval->val_type) {
	case USB_MIXER_BOOLEAN:
		return !!val;
	case USB_MIXER_INV_BOOLEAN:
		return !val;
	case USB_MIXER_S8:
	case USB_MIXER_U8:
		return val & 0xff;
	case USB_MIXER_S16:
	case USB_MIXER_U16:
		return val & 0xffff;
	}
	return 0; /* not reached */
}

static int get_relative_value(usb_mixer_elem_info_t *cval, int val)
{
	if (! cval->res)
		cval->res = 1;
	if (val < cval->min)
		return 0;
	else if (val > cval->max)
		return (cval->max - cval->min) / cval->res;
	else
		return (val - cval->min) / cval->res;
}

static int get_abs_value(usb_mixer_elem_info_t *cval, int val)
{
	if (val < 0)
		return cval->min;
	if (! cval->res)
		cval->res = 1;
	val *= cval->res;
	val += cval->min;
	if (val > cval->max)
		return cval->max;
	return val;
}


/*
 * retrieve a mixer value
 */

static int get_ctl_value(usb_mixer_elem_info_t *cval, int request, int validx, int *value_ret)
{
	unsigned char buf[2];
	int val_len = cval->val_type >= USB_MIXER_S16 ? 2 : 1;
	int timeout = 10;

	while (timeout-- > 0) {
		if (snd_usb_ctl_msg(cval->mixer->chip->dev,
				    usb_rcvctrlpipe(cval->mixer->chip->dev, 0),
				    request,
				    USB_RECIP_INTERFACE | USB_TYPE_CLASS | USB_DIR_IN,
				    validx, cval->mixer->ctrlif | (cval->id << 8),
				    buf, val_len, 100) >= 0) {
			*value_ret = convert_signed_value(cval, snd_usb_combine_bytes(buf, val_len));
			return 0;
		}
	}
	snd_printdd(KERN_ERR "cannot get ctl value: req = %#x, wValue = %#x, wIndex = %#x, type = %d\n",
		    request, validx, cval->mixer->ctrlif | (cval->id << 8), cval->val_type);
	return -EINVAL;
}

static int get_cur_ctl_value(usb_mixer_elem_info_t *cval, int validx, int *value)
{
	return get_ctl_value(cval, GET_CUR, validx, value);
}

/* channel = 0: master, 1 = first channel */
inline static int get_cur_mix_value(usb_mixer_elem_info_t *cval, int channel, int *value)
{
	return get_ctl_value(cval, GET_CUR, (cval->control << 8) | channel, value);
}

/*
 * set a mixer value
 */

static int set_ctl_value(usb_mixer_elem_info_t *cval, int request, int validx, int value_set)
{
	unsigned char buf[2];
	int val_len = cval->val_type >= USB_MIXER_S16 ? 2 : 1;
	int timeout = 10;

	value_set = convert_bytes_value(cval, value_set);
	buf[0] = value_set & 0xff;
	buf[1] = (value_set >> 8) & 0xff;
	while (timeout -- > 0)
		if (snd_usb_ctl_msg(cval->mixer->chip->dev,
				    usb_sndctrlpipe(cval->mixer->chip->dev, 0),
				    request,
				    USB_RECIP_INTERFACE | USB_TYPE_CLASS | USB_DIR_OUT,
				    validx, cval->mixer->ctrlif | (cval->id << 8),
				    buf, val_len, 100) >= 0)
			return 0;
	snd_printdd(KERN_ERR "cannot set ctl value: req = %#x, wValue = %#x, wIndex = %#x, type = %d, data = %#x/%#x\n",
		    request, validx, cval->mixer->ctrlif | (cval->id << 8), cval->val_type, buf[0], buf[1]);
	return -EINVAL;
}

static int set_cur_ctl_value(usb_mixer_elem_info_t *cval, int validx, int value)
{
	return set_ctl_value(cval, SET_CUR, validx, value);
}

inline static int set_cur_mix_value(usb_mixer_elem_info_t *cval, int channel, int value)
{
	return set_ctl_value(cval, SET_CUR, (cval->control << 8) | channel, value);
}


/*
 * parser routines begin here...
 */

static int parse_audio_unit(mixer_build_t *state, int unitid);


/*
 * check if the input/output channel routing is enabled on the given bitmap.
 * used for mixer unit parser
 */
static int check_matrix_bitmap(unsigned char *bmap, int ich, int och, int num_outs)
{
	int idx = ich * num_outs + och;
	return bmap[idx >> 3] & (0x80 >> (idx & 7));
}


/*
 * add an alsa control element
 * search and increment the index until an empty slot is found.
 *
 * if failed, give up and free the control instance.
 */

static int add_control_to_empty(mixer_build_t *state, snd_kcontrol_t *kctl)
{
	usb_mixer_elem_info_t *cval = kctl->private_data;
	int err;

	while (snd_ctl_find_id(state->chip->card, &kctl->id))
		kctl->id.index++;
	if ((err = snd_ctl_add(state->chip->card, kctl)) < 0) {
		snd_printd(KERN_ERR "cannot add control (err = %d)\n", err);
		snd_ctl_free_one(kctl);
		return err;
	}
	cval->elem_id = &kctl->id;
	cval->next_id_elem = state->mixer->id_elems[cval->id];
	state->mixer->id_elems[cval->id] = cval;
	return 0;
}


/*
 * get a terminal name string
 */

static struct iterm_name_combo {
	int type;
	char *name;
} iterm_names[] = {
	{ 0x0300, "Output" },
	{ 0x0301, "Speaker" },
	{ 0x0302, "Headphone" },
	{ 0x0303, "HMD Audio" },
	{ 0x0304, "Desktop Speaker" },
	{ 0x0305, "Room Speaker" },
	{ 0x0306, "Com Speaker" },
	{ 0x0307, "LFE" },
	{ 0x0600, "External In" },
	{ 0x0601, "Analog In" },
	{ 0x0602, "Digital In" },
	{ 0x0603, "Line" },
	{ 0x0604, "Legacy In" },
	{ 0x0605, "IEC958 In" },
	{ 0x0606, "1394 DA Stream" },
	{ 0x0607, "1394 DV Stream" },
	{ 0x0700, "Embedded" },
	{ 0x0701, "Noise Source" },
	{ 0x0702, "Equalization Noise" },
	{ 0x0703, "CD" },
	{ 0x0704, "DAT" },
	{ 0x0705, "DCC" },
	{ 0x0706, "MiniDisk" },
	{ 0x0707, "Analog Tape" },
	{ 0x0708, "Phonograph" },
	{ 0x0709, "VCR Audio" },
	{ 0x070a, "Video Disk Audio" },
	{ 0x070b, "DVD Audio" },
	{ 0x070c, "TV Tuner Audio" },
	{ 0x070d, "Satellite Rec Audio" },
	{ 0x070e, "Cable Tuner Audio" },
	{ 0x070f, "DSS Audio" },
	{ 0x0710, "Radio Receiver" },
	{ 0x0711, "Radio Transmitter" },
	{ 0x0712, "Multi-Track Recorder" },
	{ 0x0713, "Synthesizer" },
	{ 0 },
};

static int get_term_name(mixer_build_t *state, usb_audio_term_t *iterm,
			 unsigned char *name, int maxlen, int term_only)
{
	struct iterm_name_combo *names;

	if (iterm->name)
		return snd_usb_copy_string_desc(state, iterm->name, name, maxlen);

	/* virtual type - not a real terminal */
	if (iterm->type >> 16) {
		if (term_only)
			return 0;
		switch (iterm->type >> 16) {
		case SELECTOR_UNIT:
			strcpy(name, "Selector"); return 8;
		case PROCESSING_UNIT:
			strcpy(name, "Process Unit"); return 12;
		case EXTENSION_UNIT:
			strcpy(name, "Ext Unit"); return 8;
		case MIXER_UNIT:
			strcpy(name, "Mixer"); return 5;
		default:
			return sprintf(name, "Unit %d", iterm->id);
		}
	}

	switch (iterm->type & 0xff00) {
	case 0x0100:
		strcpy(name, "PCM"); return 3;
	case 0x0200:
		strcpy(name, "Mic"); return 3;
	case 0x0400:
		strcpy(name, "Headset"); return 7;
	case 0x0500:
		strcpy(name, "Phone"); return 5;
	}

	for (names = iterm_names; names->type; names++)
		if (names->type == iterm->type) {
			strcpy(name, names->name);
			return strlen(names->name);
		}
	return 0;
}


/*
 * parse the source unit recursively until it reaches to a terminal
 * or a branched unit.
 */
static int check_input_term(mixer_build_t *state, int id, usb_audio_term_t *term)
{
	unsigned char *p1;

	memset(term, 0, sizeof(*term));
	while ((p1 = find_audio_control_unit(state, id)) != NULL) {
		term->id = id;
		switch (p1[2]) {
		case INPUT_TERMINAL:
			term->type = combine_word(p1 + 4);
			term->channels = p1[7];
			term->chconfig = combine_word(p1 + 8);
			term->name = p1[11];
			return 0;
		case FEATURE_UNIT:
			id = p1[4];
			break; /* continue to parse */
		case MIXER_UNIT:
			term->type = p1[2] << 16; /* virtual type */
			term->channels = p1[5 + p1[4]];
			term->chconfig = combine_word(p1 + 6 + p1[4]);
			term->name = p1[p1[0] - 1];
			return 0;
		case SELECTOR_UNIT:
			/* call recursively to retrieve the channel info */
			if (check_input_term(state, p1[5], term) < 0)
				return -ENODEV;
			term->type = p1[2] << 16; /* virtual type */
			term->id = id;
			term->name = p1[9 + p1[0] - 1];
			return 0;
		case PROCESSING_UNIT:
		case EXTENSION_UNIT:
			if (p1[6] == 1) {
				id = p1[7];
				break; /* continue to parse */
			}
			term->type = p1[2] << 16; /* virtual type */
			term->channels = p1[7 + p1[6]];
			term->chconfig = combine_word(p1 + 8 + p1[6]);
			term->name = p1[12 + p1[6] + p1[11 + p1[6]]];
			return 0;
		default:
			return -ENODEV;
		}
	}
	return -ENODEV;
}


/*
 * Feature Unit
 */

/* feature unit control information */
struct usb_feature_control_info {
	const char *name;
	unsigned int type;	/* control type (mute, volume, etc.) */
};

static struct usb_feature_control_info audio_feature_info[] = {
	{ "Mute",		USB_MIXER_INV_BOOLEAN },
	{ "Volume",		USB_MIXER_S16 },
	{ "Tone Control - Bass",	USB_MIXER_S8 },
	{ "Tone Control - Mid",		USB_MIXER_S8 },
	{ "Tone Control - Treble",	USB_MIXER_S8 },
	{ "Graphic Equalizer",		USB_MIXER_S8 }, /* FIXME: not implemeted yet */
	{ "Auto Gain Control",	USB_MIXER_BOOLEAN },
	{ "Delay Control",	USB_MIXER_U16 },
	{ "Bass Boost",		USB_MIXER_BOOLEAN },
	{ "Loudness",		USB_MIXER_BOOLEAN },
};


/* private_free callback */
static void usb_mixer_elem_free(snd_kcontrol_t *kctl)
{
	if (kctl->private_data) {
		kfree(kctl->private_data);
		kctl->private_data = NULL;
	}
}


/*
 * interface to ALSA control for feature/mixer units
 */

/*
 * retrieve the minimum and maximum values for the specified control
 */
static int get_min_max(usb_mixer_elem_info_t *cval, int default_min)
{
	/* for failsafe */
	cval->min = default_min;
	cval->max = cval->min + 1;
	cval->res = 1;

	if (cval->val_type == USB_MIXER_BOOLEAN ||
	    cval->val_type == USB_MIXER_INV_BOOLEAN) {
		cval->initialized = 1;
	} else {
		int minchn = 0;
		if (cval->cmask) {
			int i;
			for (i = 0; i < MAX_CHANNELS; i++)
				if (cval->cmask & (1 << i)) {
					minchn = i + 1;
					break;
				}
		}
		if (get_ctl_value(cval, GET_MAX, (cval->control << 8) | minchn, &cval->max) < 0 ||
		    get_ctl_value(cval, GET_MIN, (cval->control << 8) | minchn, &cval->min) < 0) {
			snd_printd(KERN_ERR "%d:%d: cannot get min/max values for control %d (id %d)\n",
				   cval->id, cval->mixer->ctrlif, cval->control, cval->id);
			return -EINVAL;
		}
		if (get_ctl_value(cval, GET_RES, (cval->control << 8) | minchn, &cval->res) < 0) {
			cval->res = 1;
		} else {
			int last_valid_res = cval->res;

			while (cval->res > 1) {
				if (set_ctl_value(cval, SET_RES, (cval->control << 8) | minchn, cval->res / 2) < 0)
					break;
				cval->res /= 2;
			}
			if (get_ctl_value(cval, GET_RES, (cval->control << 8) | minchn, &cval->res) < 0)
				cval->res = last_valid_res;
		}
		if (cval->res == 0)
			cval->res = 1;
		cval->initialized = 1;
	}
	return 0;
}


/* get a feature/mixer unit info */
static int mixer_ctl_feature_info(snd_kcontrol_t *kcontrol, snd_ctl_elem_info_t *uinfo)
{
	usb_mixer_elem_info_t *cval = kcontrol->private_data;

	if (cval->val_type == USB_MIXER_BOOLEAN ||
	    cval->val_type == USB_MIXER_INV_BOOLEAN)
		uinfo->type = SNDRV_CTL_ELEM_TYPE_BOOLEAN;
	else
		uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
	uinfo->count = cval->channels;
	if (cval->val_type == USB_MIXER_BOOLEAN ||
	    cval->val_type == USB_MIXER_INV_BOOLEAN) {
		uinfo->value.integer.min = 0;
		uinfo->value.integer.max = 1;
	} else {
		if (! cval->initialized)
			get_min_max(cval,  0);
		uinfo->value.integer.min = 0;
		uinfo->value.integer.max = (cval->max - cval->min) / cval->res;
	}
	return 0;
}

/* get the current value from feature/mixer unit */
static int mixer_ctl_feature_get(snd_kcontrol_t *kcontrol, snd_ctl_elem_value_t *ucontrol)
{
	usb_mixer_elem_info_t *cval = kcontrol->private_data;
	int c, cnt, val, err;

	if (cval->cmask) {
		cnt = 0;
		for (c = 0; c < MAX_CHANNELS; c++) {
			if (cval->cmask & (1 << c)) {
				err = get_cur_mix_value(cval, c + 1, &val);
				if (err < 0) {
					if (cval->mixer->ignore_ctl_error) {
						ucontrol->value.integer.value[0] = cval->min;
						return 0;
					}
					snd_printd(KERN_ERR "cannot get current value for control %d ch %d: err = %d\n", cval->control, c + 1, err);
					return err;
				}
				val = get_relative_value(cval, val);
				ucontrol->value.integer.value[cnt] = val;
				cnt++;
			}
		}
	} else {
		/* master channel */
		err = get_cur_mix_value(cval, 0, &val);
		if (err < 0) {
			if (cval->mixer->ignore_ctl_error) {
				ucontrol->value.integer.value[0] = cval->min;
				return 0;
			}
			snd_printd(KERN_ERR "cannot get current value for control %d master ch: err = %d\n", cval->control, err);
			return err;
		}
		val = get_relative_value(cval, val);
		ucontrol->value.integer.value[0] = val;
	}
	return 0;
}

/* put the current value to feature/mixer unit */
static int mixer_ctl_feature_put(snd_kcontrol_t *kcontrol, snd_ctl_elem_value_t *ucontrol)
{
	usb_mixer_elem_info_t *cval = kcontrol->private_data;
	int c, cnt, val, oval, err;
	int changed = 0;

	if (cval->cmask) {
		cnt = 0;
		for (c = 0; c < MAX_CHANNELS; c++) {
			if (cval->cmask & (1 << c)) {
				err = get_cur_mix_value(cval, c + 1, &oval);
				if (err < 0) {
					if (cval->mixer->ignore_ctl_error)
						return 0;
					return err;
				}
				val = ucontrol->value.integer.value[cnt];
				val = get_abs_value(cval, val);
				if (oval != val) {
					set_cur_mix_value(cval, c + 1, val);
					changed = 1;
				}
				get_cur_mix_value(cval, c + 1, &val);
				cnt++;
			}
		}
	} else {
		/* master channel */
		err = get_cur_mix_value(cval, 0, &oval);
		if (err < 0 && cval->mixer->ignore_ctl_error)
			return 0;
		if (err < 0)
			return err;
		val = ucontrol->value.integer.value[0];
		val = get_abs_value(cval, val);
		if (val != oval) {
			set_cur_mix_value(cval, 0, val);
			changed = 1;
		}
	}
	return changed;
}

static snd_kcontrol_new_t usb_feature_unit_ctl = {
	.iface = SNDRV_CTL_ELEM_IFACE_MIXER,
	.name = "", /* will be filled later manually */
	.info = mixer_ctl_feature_info,
	.get = mixer_ctl_feature_get,
	.put = mixer_ctl_feature_put,
};


/*
 * build a feature control
 */

static void build_feature_ctl(mixer_build_t *state, unsigned char *desc,
			      unsigned int ctl_mask, int control,
			      usb_audio_term_t *iterm, int unitid)
{
	unsigned int len = 0;
	int mapped_name = 0;
	int nameid = desc[desc[0] - 1];
	snd_kcontrol_t *kctl;
	usb_mixer_elem_info_t *cval;

	control++; /* change from zero-based to 1-based value */

	if (control == USB_FEATURE_GEQ) {
		/* FIXME: not supported yet */
		return;
	}

	if (check_ignored_ctl(state, unitid, control))
		return;

	cval = kcalloc(1, sizeof(*cval), GFP_KERNEL);
	if (! cval) {
		snd_printk(KERN_ERR "cannot malloc kcontrol\n");
		return;
	}
	cval->mixer = state->mixer;
	cval->id = unitid;
	cval->control = control;
	cval->cmask = ctl_mask;
	cval->val_type = audio_feature_info[control-1].type;
	if (ctl_mask == 0)
		cval->channels = 1;	/* master channel */
	else {
		int i, c = 0;
		for (i = 0; i < 16; i++)
			if (ctl_mask & (1 << i))
				c++;
		cval->channels = c;
	}

	/* get min/max values */
	get_min_max(cval, 0);

	kctl = snd_ctl_new1(&usb_feature_unit_ctl, cval);
	if (! kctl) {
		snd_printk(KERN_ERR "cannot malloc kcontrol\n");
		kfree(cval);
		return;
	}
	kctl->private_free = usb_mixer_elem_free;

	len = check_mapped_name(state, unitid, control, kctl->id.name, sizeof(kctl->id.name));
	mapped_name = len != 0;
	if (! len && nameid)
		len = snd_usb_copy_string_desc(state, nameid, kctl->id.name, sizeof(kctl->id.name));

	switch (control) {
	case USB_FEATURE_MUTE:
	case USB_FEATURE_VOLUME:
		/* determine the control name.  the rule is:
		 * - if a name id is given in descriptor, use it.
		 * - if the connected input can be determined, then use the name
		 *   of terminal type.
		 * - if the connected output can be determined, use it.
		 * - otherwise, anonymous name.
		 */
		if (! len) {
			len = get_term_name(state, iterm, kctl->id.name, sizeof(kctl->id.name), 1);
			if (! len)
				len = get_term_name(state, &state->oterm, kctl->id.name, sizeof(kctl->id.name), 1);
			if (! len)
				len = snprintf(kctl->id.name, sizeof(kctl->id.name),
					       "Feature %d", unitid);
		}
		/* determine the stream direction:
		 * if the connected output is USB stream, then it's likely a
		 * capture stream.  otherwise it should be playback (hopefully :)
		 */
		if (! mapped_name && ! (state->oterm.type >> 16)) {
			if ((state->oterm.type & 0xff00) == 0x0100) {
				len = strlcat(kctl->id.name, " Capture", sizeof(kctl->id.name));
			} else {
				len = strlcat(kctl->id.name + len, " Playback", sizeof(kctl->id.name));
			}
		}
		strlcat(kctl->id.name + len, control == USB_FEATURE_MUTE ? " Switch" : " Volume",
			sizeof(kctl->id.name));
		break;

	default:
		if (! len)
			strlcpy(kctl->id.name, audio_feature_info[control-1].name,
				sizeof(kctl->id.name));
		break;
	}

	/* quirk for UDA1321/N101 */
	/* note that detection between firmware 2.1.1.7 (N101) and later 2.1.1.21 */
	/* is not very clear from datasheets */
	/* I hope that the min value is -15360 for newer firmware --jk */
	switch (state->chip->usb_id) {
	case USB_ID(0x0471, 0x0101):
	case USB_ID(0x0471, 0x0104):
	case USB_ID(0x0471, 0x0105):
	case USB_ID(0x0672, 0x1041):
		if (!strcmp(kctl->id.name, "PCM Playback Volume") &&
		    cval->min == -15616) {
			snd_printk("using volume control quirk for the UDA1321/N101 chip\n");
			cval->max = -256;
		}
	}

	snd_printdd(KERN_INFO "[%d] FU [%s] ch = %d, val = %d/%d/%d\n",
		    cval->id, kctl->id.name, cval->channels, cval->min, cval->max, cval->res);
	add_control_to_empty(state, kctl);
}



/*
 * parse a feature unit
 *
 * most of controlls are defined here.
 */
static int parse_audio_feature_unit(mixer_build_t *state, int unitid, unsigned char *ftr)
{
	int channels, i, j;
	usb_audio_term_t iterm;
	unsigned int master_bits, first_ch_bits;
	int err, csize;

	if (ftr[0] < 7 || ! (csize = ftr[5]) || ftr[0] < 7 + csize) {
		snd_printk(KERN_ERR "usbaudio: unit %u: invalid FEATURE_UNIT descriptor\n", unitid);
		return -EINVAL;
	}

	/* parse the source unit */
	if ((err = parse_audio_unit(state, ftr[4])) < 0)
		return err;

	/* determine the input source type and name */
	if (check_input_term(state, ftr[4], &iterm) < 0)
		return -EINVAL;

	channels = (ftr[0] - 7) / csize - 1;

	master_bits = snd_usb_combine_bytes(ftr + 6, csize);
	if (channels > 0)
		first_ch_bits = snd_usb_combine_bytes(ftr + 6 + csize, csize);
	else
		first_ch_bits = 0;
	/* check all control types */
	for (i = 0; i < 10; i++) {
		unsigned int ch_bits = 0;
		for (j = 0; j < channels; j++) {
			unsigned int mask = snd_usb_combine_bytes(ftr + 6 + csize * (j+1), csize);
			if (mask & (1 << i))
				ch_bits |= (1 << j);
		}
		if (ch_bits & 1) /* the first channel must be set (for ease of programming) */
			build_feature_ctl(state, ftr, ch_bits, i, &iterm, unitid);
		if (master_bits & (1 << i))
			build_feature_ctl(state, ftr, 0, i, &iterm, unitid);
	}

	return 0;
}


/*
 * Mixer Unit
 */

/*
 * build a mixer unit control
 *
 * the callbacks are identical with feature unit.
 * input channel number (zero based) is given in control field instead.
 */

static void build_mixer_unit_ctl(mixer_build_t *state, unsigned char *desc,
				 int in_pin, int in_ch, int unitid,
				 usb_audio_term_t *iterm)
{
	usb_mixer_elem_info_t *cval;
	unsigned int input_pins = desc[4];
	unsigned int num_outs = desc[5 + input_pins];
	unsigned int i, len;
	snd_kcontrol_t *kctl;

	if (check_ignored_ctl(state, unitid, 0))
		return;

	cval = kcalloc(1, sizeof(*cval), GFP_KERNEL);
	if (! cval)
		return;

	cval->mixer = state->mixer;
	cval->id = unitid;
	cval->control = in_ch + 1; /* based on 1 */
	cval->val_type = USB_MIXER_S16;
	for (i = 0; i < num_outs; i++) {
		if (check_matrix_bitmap(desc + 9 + input_pins, in_ch, i, num_outs)) {
			cval->cmask |= (1 << i);
			cval->channels++;
		}
	}

	/* get min/max values */
	get_min_max(cval, 0);

	kctl = snd_ctl_new1(&usb_feature_unit_ctl, cval);
	if (! kctl) {
		snd_printk(KERN_ERR "cannot malloc kcontrol\n");
		kfree(cval);
		return;
	}
	kctl->private_free = usb_mixer_elem_free;

	len = check_mapped_name(state, unitid, 0, kctl->id.name, sizeof(kctl->id.name));
	if (! len)
		len = get_term_name(state, iterm, kctl->id.name, sizeof(kctl->id.name), 0);
	if (! len)
		len = sprintf(kctl->id.name, "Mixer Source %d", in_ch + 1);
	strlcat(kctl->id.name + len, " Volume", sizeof(kctl->id.name));

	snd_printdd(KERN_INFO "[%d] MU [%s] ch = %d, val = %d/%d\n",
		    cval->id, kctl->id.name, cval->channels, cval->min, cval->max);
	add_control_to_empty(state, kctl);
}


/*
 * parse a mixer unit
 */
static int parse_audio_mixer_unit(mixer_build_t *state, int unitid, unsigned char *desc)
{
	usb_audio_term_t iterm;
	int input_pins, num_ins, num_outs;
	int pin, ich, err;

	if (desc[0] < 11 || ! (input_pins = desc[4]) || ! (num_outs = desc[5 + input_pins])) {
		snd_printk(KERN_ERR "invalid MIXER UNIT descriptor %d\n", unitid);
		return -EINVAL;
	}
	/* no bmControls field (e.g. Maya44) -> ignore */
	if (desc[0] <= 10 + input_pins) {
		snd_printdd(KERN_INFO "MU %d has no bmControls field\n", unitid);
		return 0;
	}

	num_ins = 0;
	ich = 0;
	for (pin = 0; pin < input_pins; pin++) {
		err = parse_audio_unit(state, desc[5 + pin]);
		if (err < 0)
			return err;
		err = check_input_term(state, desc[5 + pin], &iterm);
		if (err < 0)
			return err;
		num_ins += iterm.channels;
		for (; ich < num_ins; ++ich) {
			int och, ich_has_controls = 0;

			for (och = 0; och < num_outs; ++och) {
				if (check_matrix_bitmap(desc + 9 + input_pins,
							ich, och, num_outs)) {
					ich_has_controls = 1;
					break;
				}
			}
			if (ich_has_controls)
				build_mixer_unit_ctl(state, desc, pin, ich,
						     unitid, &iterm);
		}
	}
	return 0;
}


/*
 * Processing Unit / Extension Unit
 */

/* get callback for processing/extension unit */
static int mixer_ctl_procunit_get(snd_kcontrol_t *kcontrol, snd_ctl_elem_value_t *ucontrol)
{
	usb_mixer_elem_info_t *cval = kcontrol->private_data;
	int err, val;

	err = get_cur_ctl_value(cval, cval->control << 8, &val);
	if (err < 0 && cval->mixer->ignore_ctl_error) {
		ucontrol->value.integer.value[0] = cval->min;
		return 0;
	}
	if (err < 0)
		return err;
	val = get_relative_value(cval, val);
	ucontrol->value.integer.value[0] = val;
	return 0;
}

/* put callback for processing/extension unit */
static int mixer_ctl_procunit_put(snd_kcontrol_t *kcontrol, snd_ctl_elem_value_t *ucontrol)
{
	usb_mixer_elem_info_t *cval = kcontrol->private_data;
	int val, oval, err;

	err = get_cur_ctl_value(cval, cval->control << 8, &oval);
	if (err < 0) {
		if (cval->mixer->ignore_ctl_error)
			return 0;
		return err;
	}
	val = ucontrol->value.integer.value[0];
	val = get_abs_value(cval, val);
	if (val != oval) {
		set_cur_ctl_value(cval, cval->control << 8, val);
		return 1;
	}
	return 0;
}

/* alsa control interface for processing/extension unit */
static snd_kcontrol_new_t mixer_procunit_ctl = {
	.iface = SNDRV_CTL_ELEM_IFACE_MIXER,
	.name = "", /* will be filled later */
	.info = mixer_ctl_feature_info,
	.get = mixer_ctl_procunit_get,
	.put = mixer_ctl_procunit_put,
};


/*
 * predefined data for processing units
 */
struct procunit_value_info {
	int control;
	char *suffix;
	int val_type;
	int min_value;
};

struct procunit_info {
	int type;
	char *name;
	struct procunit_value_info *values;
};

static struct procunit_value_info updown_proc_info[] = {
	{ USB_PROC_UPDOWN_SWITCH, "Switch", USB_MIXER_BOOLEAN },
	{ USB_PROC_UPDOWN_MODE_SEL, "Mode Select", USB_MIXER_U8, 1 },
	{ 0 }
};
static struct procunit_value_info prologic_proc_info[] = {
	{ USB_PROC_PROLOGIC_SWITCH, "Switch", USB_MIXER_BOOLEAN },
	{ USB_PROC_PROLOGIC_MODE_SEL, "Mode Select", USB_MIXER_U8, 1 },
	{ 0 }
};
static struct procunit_value_info threed_enh_proc_info[] = {
	{ USB_PROC_3DENH_SWITCH, "Switch", USB_MIXER_BOOLEAN },
	{ USB_PROC_3DENH_SPACE, "Spaciousness", USB_MIXER_U8 },
	{ 0 }
};
static struct procunit_value_info reverb_proc_info[] = {
	{ USB_PROC_REVERB_SWITCH, "Switch", USB_MIXER_BOOLEAN },
	{ USB_PROC_REVERB_LEVEL, "Level", USB_MIXER_U8 },
	{ USB_PROC_REVERB_TIME, "Time", USB_MIXER_U16 },
	{ USB_PROC_REVERB_DELAY, "Delay", USB_MIXER_U8 },
	{ 0 }
};
static struct procunit_value_info chorus_proc_info[] = {
	{ USB_PROC_CHORUS_SWITCH, "Switch", USB_MIXER_BOOLEAN },
	{ USB_PROC_CHORUS_LEVEL, "Level", USB_MIXER_U8 },
	{ USB_PROC_CHORUS_RATE, "Rate", USB_MIXER_U16 },
	{ USB_PROC_CHORUS_DEPTH, "Depth", USB_MIXER_U16 },
	{ 0 }
};
static struct procunit_value_info dcr_proc_info[] = {
	{ USB_PROC_DCR_SWITCH, "Switch", USB_MIXER_BOOLEAN },
	{ USB_PROC_DCR_RATIO, "Ratio", USB_MIXER_U16 },
	{ USB_PROC_DCR_MAX_AMP, "Max Amp", USB_MIXER_S16 },
	{ USB_PROC_DCR_THRESHOLD, "Threshold", USB_MIXER_S16 },
	{ USB_PROC_DCR_ATTACK, "Attack Time", USB_MIXER_U16 },
	{ USB_PROC_DCR_RELEASE, "Release Time", USB_MIXER_U16 },
	{ 0 }
};

static struct procunit_info procunits[] = {
	{ USB_PROC_UPDOWN, "Up Down", updown_proc_info },
	{ USB_PROC_PROLOGIC, "Dolby Prologic", prologic_proc_info },
	{ USB_PROC_3DENH, "3D Stereo Extender", threed_enh_proc_info },
	{ USB_PROC_REVERB, "Reverb", reverb_proc_info },
	{ USB_PROC_CHORUS, "Chorus", chorus_proc_info },
	{ USB_PROC_DCR, "DCR", dcr_proc_info },
	{ 0 },
};

/*
 * build a processing/extension unit
 */
static int build_audio_procunit(mixer_build_t *state, int unitid, unsigned char *dsc, struct procunit_info *list, char *name)
{
	int num_ins = dsc[6];
	usb_mixer_elem_info_t *cval;
	snd_kcontrol_t *kctl;
	int i, err, nameid, type, len;
	struct procunit_info *info;
	struct procunit_value_info *valinfo;
	static struct procunit_value_info default_value_info[] = {
		{ 0x01, "Switch", USB_MIXER_BOOLEAN },
		{ 0 }
	};
	static struct procunit_info default_info = {
		0, NULL, default_value_info
	};

	if (dsc[0] < 13 || dsc[0] < 13 + num_ins || dsc[0] < num_ins + dsc[11 + num_ins]) {
		snd_printk(KERN_ERR "invalid %s descriptor (id %d)\n", name, unitid);
		return -EINVAL;
	}

	for (i = 0; i < num_ins; i++) {
		if ((err = parse_audio_unit(state, dsc[7 + i])) < 0)
			return err;
	}

	type = combine_word(&dsc[4]);
	for (info = list; info && info->type; info++)
		if (info->type == type)
			break;
	if (! info || ! info->type)
		info = &default_info;

	for (valinfo = info->values; valinfo->control; valinfo++) {
		/* FIXME: bitmap might be longer than 8bit */
		if (! (dsc[12 + num_ins] & (1 << (valinfo->control - 1))))
			continue;
		if (check_ignored_ctl(state, unitid, valinfo->control))
			continue;
		cval = kcalloc(1, sizeof(*cval), GFP_KERNEL);
		if (! cval) {
			snd_printk(KERN_ERR "cannot malloc kcontrol\n");
			return -ENOMEM;
		}
		cval->mixer = state->mixer;
		cval->id = unitid;
		cval->control = valinfo->control;
		cval->val_type = valinfo->val_type;
		cval->channels = 1;

		/* get min/max values */
		if (type == USB_PROC_UPDOWN && cval->control == USB_PROC_UPDOWN_MODE_SEL) {
			/* FIXME: hard-coded */
			cval->min = 1;
			cval->max = dsc[15];
			cval->res = 1;
			cval->initialized = 1;
		} else
			get_min_max(cval, valinfo->min_value);

		kctl = snd_ctl_new1(&mixer_procunit_ctl, cval);
		if (! kctl) {
			snd_printk(KERN_ERR "cannot malloc kcontrol\n");
			kfree(cval);
			return -ENOMEM;
		}
		kctl->private_free = usb_mixer_elem_free;

		if (check_mapped_name(state, unitid, cval->control, kctl->id.name, sizeof(kctl->id.name)))
			;
		else if (info->name)
			strlcpy(kctl->id.name, info->name, sizeof(kctl->id.name));
		else {
			nameid = dsc[12 + num_ins + dsc[11 + num_ins]];
			len = 0;
			if (nameid)
				len = snd_usb_copy_string_desc(state, nameid, kctl->id.name, sizeof(kctl->id.name));
			if (! len)
				strlcpy(kctl->id.name, name, sizeof(kctl->id.name));
		}
		strlcat(kctl->id.name, " ", sizeof(kctl->id.name));
		strlcat(kctl->id.name, valinfo->suffix, sizeof(kctl->id.name));

		snd_printdd(KERN_INFO "[%d] PU [%s] ch = %d, val = %d/%d\n",
			    cval->id, kctl->id.name, cval->channels, cval->min, cval->max);
		if ((err = add_control_to_empty(state, kctl)) < 0)
			return err;
	}
	return 0;
}


static int parse_audio_processing_unit(mixer_build_t *state, int unitid, unsigned char *desc)
{
	return build_audio_procunit(state, unitid, desc, procunits, "Processing Unit");
}

static int parse_audio_extension_unit(mixer_build_t *state, int unitid, unsigned char *desc)
{
	return build_audio_procunit(state, unitid, desc, NULL, "Extension Unit");
}


/*
 * Selector Unit
 */

/* info callback for selector unit
 * use an enumerator type for routing
 */
static int mixer_ctl_selector_info(snd_kcontrol_t *kcontrol, snd_ctl_elem_info_t *uinfo)
{
	usb_mixer_elem_info_t *cval = kcontrol->private_data;
	char **itemlist = (char **)kcontrol->private_value;

	snd_assert(itemlist, return -EINVAL);
	uinfo->type = SNDRV_CTL_ELEM_TYPE_ENUMERATED;
	uinfo->count = 1;
	uinfo->value.enumerated.items = cval->max;
	if ((int)uinfo->value.enumerated.item >= cval->max)
		uinfo->value.enumerated.item = cval->max - 1;
	strcpy(uinfo->value.enumerated.name, itemlist[uinfo->value.enumerated.item]);
	return 0;
}

/* get callback for selector unit */
static int mixer_ctl_selector_get(snd_kcontrol_t *kcontrol, snd_ctl_elem_value_t *ucontrol)
{
	usb_mixer_elem_info_t *cval = kcontrol->private_data;
	int val, err;

	err = get_cur_ctl_value(cval, 0, &val);
	if (err < 0) {
		if (cval->mixer->ignore_ctl_error) {
			ucontrol->value.enumerated.item[0] = 0;
			return 0;
		}
		return err;
	}
	val = get_relative_value(cval, val);
	ucontrol->value.enumerated.item[0] = val;
	return 0;
}

/* put callback for selector unit */
static int mixer_ctl_selector_put(snd_kcontrol_t *kcontrol, snd_ctl_elem_value_t *ucontrol)
{
	usb_mixer_elem_info_t *cval = kcontrol->private_data;
	int val, oval, err;

	err = get_cur_ctl_value(cval, 0, &oval);
	if (err < 0) {
		if (cval->mixer->ignore_ctl_error)
			return 0;
		return err;
	}
	val = ucontrol->value.enumerated.item[0];
	val = get_abs_value(cval, val);
	if (val != oval) {
		set_cur_ctl_value(cval, 0, val);
		return 1;
	}
	return 0;
}

/* alsa control interface for selector unit */
static snd_kcontrol_new_t mixer_selectunit_ctl = {
	.iface = SNDRV_CTL_ELEM_IFACE_MIXER,
	.name = "", /* will be filled later */
	.info = mixer_ctl_selector_info,
	.get = mixer_ctl_selector_get,
	.put = mixer_ctl_selector_put,
};


/* private free callback.
 * free both private_data and private_value
 */
static void usb_mixer_selector_elem_free(snd_kcontrol_t *kctl)
{
	int i, num_ins = 0;

	if (kctl->private_data) {
		usb_mixer_elem_info_t *cval = kctl->private_data;
		num_ins = cval->max;
		kfree(cval);
		kctl->private_data = NULL;
	}
	if (kctl->private_value) {
		char **itemlist = (char **)kctl->private_value;
		for (i = 0; i < num_ins; i++)
			kfree(itemlist[i]);
		kfree(itemlist);
		kctl->private_value = 0;
	}
}

/*
 * parse a selector unit
 */
static int parse_audio_selector_unit(mixer_build_t *state, int unitid, unsigned char *desc)
{
	unsigned int num_ins = desc[4];
	unsigned int i, nameid, len;
	int err;
	usb_mixer_elem_info_t *cval;
	snd_kcontrol_t *kctl;
	char **namelist;

	if (! num_ins || desc[0] < 6 + num_ins) {
		snd_printk(KERN_ERR "invalid SELECTOR UNIT descriptor %d\n", unitid);
		return -EINVAL;
	}

	for (i = 0; i < num_ins; i++) {
		if ((err = parse_audio_unit(state, desc[5 + i])) < 0)
			return err;
	}

	if (num_ins == 1) /* only one ? nonsense! */
		return 0;

	if (check_ignored_ctl(state, unitid, 0))
		return 0;

	cval = kcalloc(1, sizeof(*cval), GFP_KERNEL);
	if (! cval) {
		snd_printk(KERN_ERR "cannot malloc kcontrol\n");
		return -ENOMEM;
	}
	cval->mixer = state->mixer;
	cval->id = unitid;
	cval->val_type = USB_MIXER_U8;
	cval->channels = 1;
	cval->min = 1;
	cval->max = num_ins;
	cval->res = 1;
	cval->initialized = 1;

	namelist = kmalloc(sizeof(char *) * num_ins, GFP_KERNEL);
	if (! namelist) {
		snd_printk(KERN_ERR "cannot malloc\n");
		kfree(cval);
		return -ENOMEM;
	}
#define MAX_ITEM_NAME_LEN	64
	for (i = 0; i < num_ins; i++) {
		usb_audio_term_t iterm;
		len = 0;
		namelist[i] = kmalloc(MAX_ITEM_NAME_LEN, GFP_KERNEL);
		if (! namelist[i]) {
			snd_printk(KERN_ERR "cannot malloc\n");
			while (--i > 0)
				kfree(namelist[i]);
			kfree(namelist);
			kfree(cval);
			return -ENOMEM;
		}
		len = check_mapped_selector_name(state, unitid, i, namelist[i],
						 MAX_ITEM_NAME_LEN);
		if (! len && check_input_term(state, desc[5 + i], &iterm) >= 0)
			len = get_term_name(state, &iterm, namelist[i], MAX_ITEM_NAME_LEN, 0);
		if (! len)
			sprintf(namelist[i], "Input %d", i);
	}

	kctl = snd_ctl_new1(&mixer_selectunit_ctl, cval);
	if (! kctl) {
		snd_printk(KERN_ERR "cannot malloc kcontrol\n");
		kfree(cval);
		return -ENOMEM;
	}
	kctl->private_value = (unsigned long)namelist;
	kctl->private_free = usb_mixer_selector_elem_free;

	nameid = desc[desc[0] - 1];
	len = check_mapped_name(state, unitid, 0, kctl->id.name, sizeof(kctl->id.name));
	if (len)
		;
	else if (nameid)
		snd_usb_copy_string_desc(state, nameid, kctl->id.name, sizeof(kctl->id.name));
	else {
		len = get_term_name(state, &state->oterm,
				    kctl->id.name, sizeof(kctl->id.name), 0);
		if (! len)
			strlcpy(kctl->id.name, "USB", sizeof(kctl->id.name));

		if ((state->oterm.type & 0xff00) == 0x0100)
			strlcat(kctl->id.name, " Capture Source", sizeof(kctl->id.name));
		else
			strlcat(kctl->id.name, " Playback Source", sizeof(kctl->id.name));
	}

	snd_printdd(KERN_INFO "[%d] SU [%s] items = %d\n",
		    cval->id, kctl->id.name, num_ins);
	if ((err = add_control_to_empty(state, kctl)) < 0)
		return err;

	return 0;
}


/*
 * parse an audio unit recursively
 */

static int parse_audio_unit(mixer_build_t *state, int unitid)
{
	unsigned char *p1;

	if (test_and_set_bit(unitid, state->unitbitmap))
		return 0; /* the unit already visited */

	p1 = find_audio_control_unit(state, unitid);
	if (!p1) {
		snd_printk(KERN_ERR "usbaudio: unit %d not found!\n", unitid);
		return -EINVAL;
	}

	switch (p1[2]) {
	case INPUT_TERMINAL:
		return 0; /* NOP */
	case MIXER_UNIT:
		return parse_audio_mixer_unit(state, unitid, p1);
	case SELECTOR_UNIT:
		return parse_audio_selector_unit(state, unitid, p1);
	case FEATURE_UNIT:
		return parse_audio_feature_unit(state, unitid, p1);
	case PROCESSING_UNIT:
		return parse_audio_processing_unit(state, unitid, p1);
	case EXTENSION_UNIT:
		return parse_audio_extension_unit(state, unitid, p1);
	default:
		snd_printk(KERN_ERR "usbaudio: unit %u: unexpected type 0x%02x\n", unitid, p1[2]);
		return -EINVAL;
	}
}

static void snd_usb_mixer_free(struct usb_mixer_interface *mixer)
{
	kfree(mixer->id_elems);
	if (mixer->urb) {
		kfree(mixer->urb->transfer_buffer);
		usb_free_urb(mixer->urb);
	}
	if (mixer->rc_urb)
		usb_free_urb(mixer->rc_urb);
	kfree(mixer->rc_setup_packet);
	kfree(mixer);
}

static int snd_usb_mixer_dev_free(snd_device_t *device)
{
	struct usb_mixer_interface *mixer = device->device_data;
	snd_usb_mixer_free(mixer);
	return 0;
}

/*
 * create mixer controls
 *
 * walk through all OUTPUT_TERMINAL descriptors to search for mixers
 */
static int snd_usb_mixer_controls(struct usb_mixer_interface *mixer)
{
	unsigned char *desc;
	mixer_build_t state;
	int err;
	const struct usbmix_ctl_map *map;
	struct usb_host_interface *hostif;

	hostif = &usb_ifnum_to_if(mixer->chip->dev, mixer->ctrlif)->altsetting[0];
	memset(&state, 0, sizeof(state));
	state.chip = mixer->chip;
	state.mixer = mixer;
	state.buffer = hostif->extra;
	state.buflen = hostif->extralen;

	/* check the mapping table */
	for (map = usbmix_ctl_maps; map->id; map++) {
		if (map->id == state.chip->usb_id) {
			state.map = map->map;
			state.selector_map = map->selector_map;
			mixer->ignore_ctl_error = map->ignore_ctl_error;
			break;
		}
	}

	desc = NULL;
	while ((desc = snd_usb_find_csint_desc(hostif->extra, hostif->extralen, desc, OUTPUT_TERMINAL)) != NULL) {
		if (desc[0] < 9)
			continue; /* invalid descriptor? */
		set_bit(desc[3], state.unitbitmap);  /* mark terminal ID as visited */
		state.oterm.id = desc[3];
		state.oterm.type = combine_word(&desc[4]);
		state.oterm.name = desc[8];
		err = parse_audio_unit(&state, desc[7]);
		if (err < 0)
			return err;
	}
	return 0;
}

static void snd_usb_mixer_notify_id(struct usb_mixer_interface *mixer,
				    int unitid)
{
	usb_mixer_elem_info_t *info;

	for (info = mixer->id_elems[unitid]; info; info = info->next_id_elem)
		snd_ctl_notify(mixer->chip->card, SNDRV_CTL_EVENT_MASK_VALUE,
			       info->elem_id);
}

static void snd_usb_mixer_memory_change(struct usb_mixer_interface *mixer,
					int unitid)
{
	/* SB remote control */
	if (mixer->rc_type != RC_NONE && unitid == 0) {
		/* read control code from device memory */
		mixer->rc_urb->dev = mixer->chip->dev;
		usb_submit_urb(mixer->rc_urb, GFP_ATOMIC);
	}
}

static void snd_usb_mixer_status_complete(struct urb *urb, struct pt_regs *regs)
{
	struct usb_mixer_interface *mixer = urb->context;

	if (urb->status == 0) {
		u8 *buf = urb->transfer_buffer;
		int i;

		for (i = urb->actual_length; i >= 2; buf += 2, i -= 2) {
			snd_printd(KERN_DEBUG "status interrupt: %02x %02x\n",
				   buf[0], buf[1]);
			/* ignore any notifications not from the control interface */
			if ((buf[0] & 0x0f) != 0)
				continue;
			if (!(buf[0] & 0x40))
				snd_usb_mixer_notify_id(mixer, buf[1]);
			else
				snd_usb_mixer_memory_change(mixer, buf[1]);
		}
	}
	if (urb->status != -ENOENT && urb->status != -ECONNRESET) {
		urb->dev = mixer->chip->dev;
		usb_submit_urb(urb, GFP_ATOMIC);
	}
}

/* create the handler for the optional status interrupt endpoint */
static int snd_usb_mixer_status_create(struct usb_mixer_interface *mixer)
{
	struct usb_host_interface *hostif;
	struct usb_endpoint_descriptor *ep;
	void *transfer_buffer;
	int buffer_length;
	unsigned int epnum;

	hostif = &usb_ifnum_to_if(mixer->chip->dev, mixer->ctrlif)->altsetting[0];
	/* we need one interrupt input endpoint */
	if (get_iface_desc(hostif)->bNumEndpoints < 1)
		return 0;
	ep = get_endpoint(hostif, 0);
	if ((ep->bEndpointAddress & USB_ENDPOINT_DIR_MASK) != USB_DIR_IN ||
	    (ep->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) != USB_ENDPOINT_XFER_INT)
		return 0;

	epnum = ep->bEndpointAddress & USB_ENDPOINT_NUMBER_MASK;
	buffer_length = le16_to_cpu(ep->wMaxPacketSize);
	transfer_buffer = kmalloc(buffer_length, GFP_KERNEL);
	if (!transfer_buffer)
		return -ENOMEM;
	mixer->urb = usb_alloc_urb(0, GFP_KERNEL);
	if (!mixer->urb) {
		kfree(transfer_buffer);
		return -ENOMEM;
	}
	usb_fill_int_urb(mixer->urb, mixer->chip->dev,
			 usb_rcvintpipe(mixer->chip->dev, epnum),
			 transfer_buffer, buffer_length,
			 snd_usb_mixer_status_complete, mixer, ep->bInterval);
	usb_submit_urb(mixer->urb, GFP_KERNEL);
	return 0;
}

static void snd_usb_soundblaster_remote_complete(struct urb *urb,
						 struct pt_regs *regs)
{
	struct usb_mixer_interface *mixer = urb->context;
	/*
	 * format of remote control data:
	 * Extigy:	xx 00
	 * Audigy 2 NX:	06 80 xx 00 00 00
	 */
	int offset = mixer->rc_type == RC_EXTIGY ? 0 : 2;
	u32 code;

	if (urb->status < 0 || urb->actual_length <= offset)
		return;
	code = mixer->rc_buffer[offset];
	/* the Mute button actually changes the mixer control */
	if (code == 13)
		snd_usb_mixer_notify_id(mixer, 18);
	mixer->rc_code = code;
	wmb();
	wake_up(&mixer->rc_waitq);
}

static int snd_usb_sbrc_hwdep_open(snd_hwdep_t *hw, struct file *file)
{
	struct usb_mixer_interface *mixer = hw->private_data;

	if (test_and_set_bit(0, &mixer->rc_hwdep_open))
		return -EBUSY;
	return 0;
}

static int snd_usb_sbrc_hwdep_release(snd_hwdep_t *hw, struct file *file)
{
	struct usb_mixer_interface *mixer = hw->private_data;

	clear_bit(0, &mixer->rc_hwdep_open);
	smp_mb__after_clear_bit();
	return 0;
}

static long snd_usb_sbrc_hwdep_read(snd_hwdep_t *hw, char __user *buf,
				     long count, loff_t *offset)
{
	struct usb_mixer_interface *mixer = hw->private_data;
	int err;
	u32 rc_code;

	if (count != 1 && count != 4)
		return -EINVAL;
	err = wait_event_interruptible(mixer->rc_waitq,
				       (rc_code = xchg(&mixer->rc_code, 0)) != 0);
	if (err == 0) {
		if (count == 1)
			err = put_user(rc_code, buf);
		else
			err = put_user(rc_code, (u32 __user *)buf);
	}
	return err < 0 ? err : count;
}

static unsigned int snd_usb_sbrc_hwdep_poll(snd_hwdep_t *hw, struct file *file,
					    poll_table *wait)
{
	struct usb_mixer_interface *mixer = hw->private_data;

	poll_wait(file, &mixer->rc_waitq, wait);
	return mixer->rc_code ? POLLIN | POLLRDNORM : 0;
}

static int snd_usb_sbrc_hwdep_ioctl(snd_hwdep_t *hw, struct file *file,
				    unsigned int cmd, unsigned long arg)
{
	u32 __user *argp = (u32 __user *)arg;
	u32 mode;

	switch (cmd) {
	case LIRC_GET_FEATURES:
		return put_user(LIRC_CAN_REC_CODE, argp);
	case LIRC_GET_REC_MODE:
		return put_user(LIRC_MODE_CODE, argp);
	case LIRC_SET_REC_MODE:
		if (get_user(mode, argp))
			return -EFAULT;
		return mode == LIRC_MODE_CODE ? 0 : -ENOSYS;
	}
	return -ENOTTY;
}

static int snd_usb_soundblaster_remote_init(struct usb_mixer_interface *mixer)
{
	snd_hwdep_t *hwdep;
	int err, len;

	switch (mixer->chip->usb_id) {
	case USB_ID(0x041e, 0x3000):
		mixer->rc_type = RC_EXTIGY;
		len = 2;
		break;
	case USB_ID(0x041e, 0x3020):
		mixer->rc_type = RC_AUDIGY2NX;
		len = 6;
		break;
	default:
		return 0;
	}

	init_waitqueue_head(&mixer->rc_waitq);
	err = snd_hwdep_new(mixer->chip->card, "SB remote control", 0, &hwdep);
	if (err < 0)
		return err;
	snprintf(hwdep->name, sizeof(hwdep->name),
		 "%s remote control", mixer->chip->card->shortname);
	hwdep->iface = SNDRV_HWDEP_IFACE_SB_RC;
	hwdep->private_data = mixer;
	hwdep->ops.read = snd_usb_sbrc_hwdep_read;
	hwdep->ops.open = snd_usb_sbrc_hwdep_open;
	hwdep->ops.release = snd_usb_sbrc_hwdep_release;
	hwdep->ops.poll = snd_usb_sbrc_hwdep_poll;
	hwdep->ops.ioctl = snd_usb_sbrc_hwdep_ioctl; 

	mixer->rc_urb = usb_alloc_urb(0, GFP_KERNEL);
	if (!mixer->rc_urb)
		return -ENOMEM;
	mixer->rc_setup_packet = kmalloc(sizeof(*mixer->rc_setup_packet), GFP_KERNEL);
	if (!mixer->rc_setup_packet) {
		usb_free_urb(mixer->rc_urb);
		mixer->rc_urb = NULL;
		return -ENOMEM;
	}
	mixer->rc_setup_packet->bRequestType =
		USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_INTERFACE;
	mixer->rc_setup_packet->bRequest = GET_MEM;
	mixer->rc_setup_packet->wValue = cpu_to_le16(0);
	mixer->rc_setup_packet->wIndex = cpu_to_le16(0);
	mixer->rc_setup_packet->wLength = cpu_to_le16(len);
	usb_fill_control_urb(mixer->rc_urb, mixer->chip->dev,
			     usb_rcvctrlpipe(mixer->chip->dev, 0),
			     (u8*)mixer->rc_setup_packet, mixer->rc_buffer, len,
			     snd_usb_soundblaster_remote_complete, mixer);
	return 0;
}

static int snd_audigy2nx_led_info(snd_kcontrol_t *kcontrol, snd_ctl_elem_info_t *uinfo)
{
	uinfo->type = SNDRV_CTL_ELEM_TYPE_BOOLEAN;
	uinfo->count = 1;
	uinfo->value.integer.min = 0;
	uinfo->value.integer.max = 1;
	return 0;
}

static int snd_audigy2nx_led_get(snd_kcontrol_t *kcontrol, snd_ctl_elem_value_t *ucontrol)
{
	struct usb_mixer_interface *mixer = snd_kcontrol_chip(kcontrol);
	int index = kcontrol->private_value;

	ucontrol->value.integer.value[0] = mixer->audigy2nx_leds[index];
	return 0;
}

static int snd_audigy2nx_led_put(snd_kcontrol_t *kcontrol, snd_ctl_elem_value_t *ucontrol)
{
	struct usb_mixer_interface *mixer = snd_kcontrol_chip(kcontrol);
	int index = kcontrol->private_value;
	int value = ucontrol->value.integer.value[0];
	int err, changed;

	if (value > 1)
		return -EINVAL;
	changed = value != mixer->audigy2nx_leds[index];
	err = snd_usb_ctl_msg(mixer->chip->dev,
			      usb_sndctrlpipe(mixer->chip->dev, 0), 0x24,
			      USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_OTHER,
			      value, index + 2, NULL, 0, 100);
	if (err < 0)
		return err;
	mixer->audigy2nx_leds[index] = value;
	return changed;
}

static snd_kcontrol_new_t snd_audigy2nx_controls[] = {
	{
		.iface = SNDRV_CTL_ELEM_IFACE_MIXER,
		.name = "CMSS LED Switch",
		.info = snd_audigy2nx_led_info,
		.get = snd_audigy2nx_led_get,
		.put = snd_audigy2nx_led_put,
		.private_value = 0,
	},
	{
		.iface = SNDRV_CTL_ELEM_IFACE_MIXER,
		.name = "Power LED Switch",
		.info = snd_audigy2nx_led_info,
		.get = snd_audigy2nx_led_get,
		.put = snd_audigy2nx_led_put,
		.private_value = 1,
	},
	{
		.iface = SNDRV_CTL_ELEM_IFACE_MIXER,
		.name = "Dolby Digital LED Switch",
		.info = snd_audigy2nx_led_info,
		.get = snd_audigy2nx_led_get,
		.put = snd_audigy2nx_led_put,
		.private_value = 2,
	},
};

static int snd_audigy2nx_controls_create(struct usb_mixer_interface *mixer)
{
	int i, err;

	for (i = 0; i < ARRAY_SIZE(snd_audigy2nx_controls); ++i) {
		err = snd_ctl_add(mixer->chip->card,
				  snd_ctl_new1(&snd_audigy2nx_controls[i], mixer));
		if (err < 0)
			return err;
	}
	mixer->audigy2nx_leds[1] = 1; /* Power LED is on by default */
	return 0;
}

int snd_usb_create_mixer(snd_usb_audio_t *chip, int ctrlif)
{
	static snd_device_ops_t dev_ops = {
		.dev_free = snd_usb_mixer_dev_free
	};
	struct usb_mixer_interface *mixer;
	int err;

	strcpy(chip->card->mixername, "USB Mixer");

	mixer = kcalloc(1, sizeof(*mixer), GFP_KERNEL);
	if (!mixer)
		return -ENOMEM;
	mixer->chip = chip;
	mixer->ctrlif = ctrlif;
#ifdef IGNORE_CTL_ERROR
	mixer->ignore_ctl_error = 1;
#endif
	mixer->id_elems = kcalloc(256, sizeof(*mixer->id_elems), GFP_KERNEL);
	if (!mixer->id_elems) {
		kfree(mixer);
		return -ENOMEM;
	}

	if ((err = snd_usb_mixer_controls(mixer)) < 0 ||
	    (err = snd_usb_mixer_status_create(mixer)) < 0)
		goto _error;

	if ((err = snd_usb_soundblaster_remote_init(mixer)) < 0)
		goto _error;

	if (mixer->chip->usb_id == USB_ID(0x041e, 0x3020)) {
		if ((err = snd_audigy2nx_controls_create(mixer)) < 0)
			goto _error;
	}

	err = snd_device_new(chip->card, SNDRV_DEV_LOWLEVEL, mixer, &dev_ops);
	if (err < 0)
		goto _error;
	list_add(&mixer->list, &chip->mixer_list);
	return 0;

_error:
	snd_usb_mixer_free(mixer);
	return err;
}

void snd_usb_mixer_disconnect(struct list_head *p)
{
	struct usb_mixer_interface *mixer;
	
	mixer = list_entry(p, struct usb_mixer_interface, list);
	if (mixer->urb)
		usb_kill_urb(mixer->urb);
	if (mixer->rc_urb)
		usb_kill_urb(mixer->rc_urb);
}
OpenPOWER on IntegriCloud