summaryrefslogblamecommitdiffstats
path: root/sound/oss/sequencer.c
blob: 4ff60a6427d9d8d3ea7cf095bc2766f2d49955fc (plain) (tree)
1
2
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
  
                        















                                                                               











































































































































                                                                           
                                 
















































                                                                
                               




                                                                                  




























                                                                                      
                                                                                   









































                                                                                                      
                                              



































































































































































































































































                                                                                                                  


                                              


















































                                                                                                         


                                              
















































































































                                                                                                    
                                        


                                            
                               







































































































































































































































































































































































































































































































































































































































































































































































































































































                                                                                                                              
                               
































                                                                                
                            









































                                                                            








                                                                                              
                                


                         

                         
                                               




                                                                                                 
                                                 







                                                                                                
                              


                           


                              
 
/*
 * sound/oss/sequencer.c
 *
 * The sequencer personality manager.
 */
/*
 * Copyright (C) by Hannu Savolainen 1993-1997
 *
 * OSS/Free for Linux is distributed under the GNU GENERAL PUBLIC LICENSE (GPL)
 * Version 2 (June 1991). See the "COPYING" file distributed with this software
 * for more info.
 */
/*
 * Thomas Sailer   : ioctl code reworked (vmalloc/vfree removed)
 * Alan Cox	   : reformatted and fixed a pair of null pointer bugs
 */
#include <linux/kmod.h>
#include <linux/spinlock.h>
#include "sound_config.h"

#include "midi_ctrl.h"

static int      sequencer_ok;
static struct sound_timer_operations *tmr;
static int      tmr_no = -1;	/* Currently selected timer */
static int      pending_timer = -1;	/* For timer change operation */
extern unsigned long seq_time;

static int      obsolete_api_used;
static DEFINE_SPINLOCK(lock);

/*
 * Local counts for number of synth and MIDI devices. These are initialized
 * by the sequencer_open.
 */
static int      max_mididev;
static int      max_synthdev;

/*
 * The seq_mode gives the operating mode of the sequencer:
 *      1 = level1 (the default)
 *      2 = level2 (extended capabilities)
 */

#define SEQ_1	1
#define SEQ_2	2
static int      seq_mode = SEQ_1;

static DECLARE_WAIT_QUEUE_HEAD(seq_sleeper);
static DECLARE_WAIT_QUEUE_HEAD(midi_sleeper);

static int      midi_opened[MAX_MIDI_DEV];

static int      midi_written[MAX_MIDI_DEV];

static unsigned long prev_input_time;
static int      prev_event_time;

#include "tuning.h"

#define EV_SZ	8
#define IEV_SZ	8

static unsigned char *queue;
static unsigned char *iqueue;

static volatile int qhead, qtail, qlen;
static volatile int iqhead, iqtail, iqlen;
static volatile int seq_playing;
static volatile int sequencer_busy;
static int      output_threshold;
static long     pre_event_timeout;
static unsigned synth_open_mask;

static int      seq_queue(unsigned char *note, char nonblock);
static void     seq_startplay(void);
static int      seq_sync(void);
static void     seq_reset(void);

#if MAX_SYNTH_DEV > 15
#error Too many synthesizer devices enabled.
#endif

int sequencer_read(int dev, struct file *file, char __user *buf, int count)
{
	int c = count, p = 0;
	int ev_len;
	unsigned long flags;

	dev = dev >> 4;

	ev_len = seq_mode == SEQ_1 ? 4 : 8;

	spin_lock_irqsave(&lock,flags);

	if (!iqlen)
	{
		spin_unlock_irqrestore(&lock,flags);
 		if (file->f_flags & O_NONBLOCK) {
  			return -EAGAIN;
  		}

 		interruptible_sleep_on_timeout(&midi_sleeper,
					       pre_event_timeout);
		spin_lock_irqsave(&lock,flags);
		if (!iqlen)
		{
			spin_unlock_irqrestore(&lock,flags);
			return 0;
		}
	}
	while (iqlen && c >= ev_len)
	{
		char *fixit = (char *) &iqueue[iqhead * IEV_SZ];
		spin_unlock_irqrestore(&lock,flags);
		if (copy_to_user(&(buf)[p], fixit, ev_len))
			return count - c;
		p += ev_len;
		c -= ev_len;

		spin_lock_irqsave(&lock,flags);
		iqhead = (iqhead + 1) % SEQ_MAX_QUEUE;
		iqlen--;
	}
	spin_unlock_irqrestore(&lock,flags);
	return count - c;
}

static void sequencer_midi_output(int dev)
{
	/*
	 * Currently NOP
	 */
}

void seq_copy_to_input(unsigned char *event_rec, int len)
{
	unsigned long flags;

	/*
	 * Verify that the len is valid for the current mode.
	 */

	if (len != 4 && len != 8)
		return;
	if ((seq_mode == SEQ_1) != (len == 4))
		return;

	if (iqlen >= (SEQ_MAX_QUEUE - 1))
		return;		/* Overflow */

	spin_lock_irqsave(&lock,flags);
	memcpy(&iqueue[iqtail * IEV_SZ], event_rec, len);
	iqlen++;
	iqtail = (iqtail + 1) % SEQ_MAX_QUEUE;
	wake_up(&midi_sleeper);
	spin_unlock_irqrestore(&lock,flags);
}
EXPORT_SYMBOL(seq_copy_to_input);

static void sequencer_midi_input(int dev, unsigned char data)
{
	unsigned int tstamp;
	unsigned char event_rec[4];

	if (data == 0xfe)	/* Ignore active sensing */
		return;

	tstamp = jiffies - seq_time;

	if (tstamp != prev_input_time)
	{
		tstamp = (tstamp << 8) | SEQ_WAIT;
		seq_copy_to_input((unsigned char *) &tstamp, 4);
		prev_input_time = tstamp;
	}
	event_rec[0] = SEQ_MIDIPUTC;
	event_rec[1] = data;
	event_rec[2] = dev;
	event_rec[3] = 0;

	seq_copy_to_input(event_rec, 4);
}

void seq_input_event(unsigned char *event_rec, int len)
{
	unsigned long this_time;

	if (seq_mode == SEQ_2)
		this_time = tmr->get_time(tmr_no);
	else
		this_time = jiffies - seq_time;

	if (this_time != prev_input_time)
	{
		unsigned char   tmp_event[8];

		tmp_event[0] = EV_TIMING;
		tmp_event[1] = TMR_WAIT_ABS;
		tmp_event[2] = 0;
		tmp_event[3] = 0;
		*(unsigned int *) &tmp_event[4] = this_time;

		seq_copy_to_input(tmp_event, 8);
		prev_input_time = this_time;
	}
	seq_copy_to_input(event_rec, len);
}
EXPORT_SYMBOL(seq_input_event);

int sequencer_write(int dev, struct file *file, const char __user *buf, int count)
{
	unsigned char event_rec[EV_SZ], ev_code;
	int p = 0, c, ev_size;
	int mode = translate_mode(file);

	dev = dev >> 4;

	DEB(printk("sequencer_write(dev=%d, count=%d)\n", dev, count));

	if (mode == OPEN_READ)
		return -EIO;

	c = count;

	while (c >= 4)
	{
		if (copy_from_user((char *) event_rec, &(buf)[p], 4))
			goto out;
		ev_code = event_rec[0];

		if (ev_code == SEQ_FULLSIZE)
		{
			int err, fmt;

			dev = *(unsigned short *) &event_rec[2];
			if (dev < 0 || dev >= max_synthdev || synth_devs[dev] == NULL)
				return -ENXIO;

			if (!(synth_open_mask & (1 << dev)))
				return -ENXIO;

			fmt = (*(short *) &event_rec[0]) & 0xffff;
			err = synth_devs[dev]->load_patch(dev, fmt, buf + p, c, 0);
			if (err < 0)
				return err;

			return err;
		}
		if (ev_code >= 128)
		{
			if (seq_mode == SEQ_2 && ev_code == SEQ_EXTENDED)
			{
				printk(KERN_WARNING "Sequencer: Invalid level 2 event %x\n", ev_code);
				return -EINVAL;
			}
			ev_size = 8;

			if (c < ev_size)
			{
				if (!seq_playing)
					seq_startplay();
				return count - c;
			}
			if (copy_from_user((char *)&event_rec[4],
					   &(buf)[p + 4], 4))
				goto out;

		}
		else
		{
			if (seq_mode == SEQ_2)
			{
				printk(KERN_WARNING "Sequencer: 4 byte event in level 2 mode\n");
				return -EINVAL;
			}
			ev_size = 4;

			if (event_rec[0] != SEQ_MIDIPUTC)
				obsolete_api_used = 1;
		}

		if (event_rec[0] == SEQ_MIDIPUTC)
		{
			if (!midi_opened[event_rec[2]])
			{
				int err, mode;
				int dev = event_rec[2];

				if (dev >= max_mididev || midi_devs[dev]==NULL)
				{
					/*printk("Sequencer Error: Nonexistent MIDI device %d\n", dev);*/
					return -ENXIO;
				}
				mode = translate_mode(file);

				if ((err = midi_devs[dev]->open(dev, mode,
								sequencer_midi_input, sequencer_midi_output)) < 0)
				{
					seq_reset();
					printk(KERN_WARNING "Sequencer Error: Unable to open Midi #%d\n", dev);
					return err;
				}
				midi_opened[dev] = 1;
			}
		}
		if (!seq_queue(event_rec, (file->f_flags & (O_NONBLOCK) ? 1 : 0)))
		{
			int processed = count - c;

			if (!seq_playing)
				seq_startplay();

			if (!processed && (file->f_flags & O_NONBLOCK))
				return -EAGAIN;
			else
				return processed;
		}
		p += ev_size;
		c -= ev_size;
	}

	if (!seq_playing)
		seq_startplay();
out:
	return count;
}

static int seq_queue(unsigned char *note, char nonblock)
{

	/*
	 * Test if there is space in the queue
	 */

	if (qlen >= SEQ_MAX_QUEUE)
		if (!seq_playing)
			seq_startplay();	/*
						 * Give chance to drain the queue
						 */

	if (!nonblock && qlen >= SEQ_MAX_QUEUE && !waitqueue_active(&seq_sleeper)) {
		/*
		 * Sleep until there is enough space on the queue
		 */
		interruptible_sleep_on(&seq_sleeper);
	}
	if (qlen >= SEQ_MAX_QUEUE)
	{
		return 0;	/*
				 * To be sure
				 */
	}
	memcpy(&queue[qtail * EV_SZ], note, EV_SZ);

	qtail = (qtail + 1) % SEQ_MAX_QUEUE;
	qlen++;

	return 1;
}

static int extended_event(unsigned char *q)
{
	int dev = q[2];

	if (dev < 0 || dev >= max_synthdev)
		return -ENXIO;

	if (!(synth_open_mask & (1 << dev)))
		return -ENXIO;

	switch (q[1])
	{
		case SEQ_NOTEOFF:
			synth_devs[dev]->kill_note(dev, q[3], q[4], q[5]);
			break;

		case SEQ_NOTEON:
			if (q[4] > 127 && q[4] != 255)
				return 0;

			if (q[5] == 0)
			{
				synth_devs[dev]->kill_note(dev, q[3], q[4], q[5]);
				break;
			}
			synth_devs[dev]->start_note(dev, q[3], q[4], q[5]);
			break;

		case SEQ_PGMCHANGE:
			synth_devs[dev]->set_instr(dev, q[3], q[4]);
			break;

		case SEQ_AFTERTOUCH:
			synth_devs[dev]->aftertouch(dev, q[3], q[4]);
			break;

		case SEQ_BALANCE:
			synth_devs[dev]->panning(dev, q[3], (char) q[4]);
			break;

		case SEQ_CONTROLLER:
			synth_devs[dev]->controller(dev, q[3], q[4], (short) (q[5] | (q[6] << 8)));
			break;

		case SEQ_VOLMODE:
			if (synth_devs[dev]->volume_method != NULL)
				synth_devs[dev]->volume_method(dev, q[3]);
			break;

		default:
			return -EINVAL;
	}
	return 0;
}

static int find_voice(int dev, int chn, int note)
{
	unsigned short key;
	int i;

	key = (chn << 8) | (note + 1);
	for (i = 0; i < synth_devs[dev]->alloc.max_voice; i++)
		if (synth_devs[dev]->alloc.map[i] == key)
			return i;
	return -1;
}

static int alloc_voice(int dev, int chn, int note)
{
	unsigned short  key;
	int voice;

	key = (chn << 8) | (note + 1);

	voice = synth_devs[dev]->alloc_voice(dev, chn, note,
					     &synth_devs[dev]->alloc);
	synth_devs[dev]->alloc.map[voice] = key;
	synth_devs[dev]->alloc.alloc_times[voice] =
			synth_devs[dev]->alloc.timestamp++;
	return voice;
}

static void seq_chn_voice_event(unsigned char *event_rec)
{
#define dev event_rec[1]
#define cmd event_rec[2]
#define chn event_rec[3]
#define note event_rec[4]
#define parm event_rec[5]

	int voice = -1;

	if ((int) dev > max_synthdev || synth_devs[dev] == NULL)
		return;
	if (!(synth_open_mask & (1 << dev)))
		return;
	if (!synth_devs[dev])
		return;

	if (seq_mode == SEQ_2)
	{
		if (synth_devs[dev]->alloc_voice)
			voice = find_voice(dev, chn, note);

		if (cmd == MIDI_NOTEON && parm == 0)
		{
			cmd = MIDI_NOTEOFF;
			parm = 64;
		}
	}

	switch (cmd)
	{
		case MIDI_NOTEON:
			if (note > 127 && note != 255)	/* Not a seq2 feature */
				return;

			if (voice == -1 && seq_mode == SEQ_2 && synth_devs[dev]->alloc_voice)
			{
				/* Internal synthesizer (FM, GUS, etc) */
				voice = alloc_voice(dev, chn, note);
			}
			if (voice == -1)
				voice = chn;

			if (seq_mode == SEQ_2 && (int) dev < num_synths)
			{
				/*
				 * The MIDI channel 10 is a percussive channel. Use the note
				 * number to select the proper patch (128 to 255) to play.
				 */

				if (chn == 9)
				{
					synth_devs[dev]->set_instr(dev, voice, 128 + note);
					synth_devs[dev]->chn_info[chn].pgm_num = 128 + note;
				}
				synth_devs[dev]->setup_voice(dev, voice, chn);
			}
			synth_devs[dev]->start_note(dev, voice, note, parm);
			break;

		case MIDI_NOTEOFF:
			if (voice == -1)
				voice = chn;
			synth_devs[dev]->kill_note(dev, voice, note, parm);
			break;

		case MIDI_KEY_PRESSURE:
			if (voice == -1)
				voice = chn;
			synth_devs[dev]->aftertouch(dev, voice, parm);
			break;

		default:;
	}
#undef dev
#undef cmd
#undef chn
#undef note
#undef parm
}


static void seq_chn_common_event(unsigned char *event_rec)
{
	unsigned char dev = event_rec[1];
	unsigned char cmd = event_rec[2];
	unsigned char chn = event_rec[3];
	unsigned char p1 = event_rec[4];

	/* unsigned char p2 = event_rec[5]; */
	unsigned short w14 = *(short *) &event_rec[6];

	if ((int) dev > max_synthdev || synth_devs[dev] == NULL)
		return;
	if (!(synth_open_mask & (1 << dev)))
		return;
	if (!synth_devs[dev])
		return;

	switch (cmd)
	{
		case MIDI_PGM_CHANGE:
			if (seq_mode == SEQ_2)
			{
				if (chn > 15)
					break;

				synth_devs[dev]->chn_info[chn].pgm_num = p1;
				if ((int) dev >= num_synths)
					synth_devs[dev]->set_instr(dev, chn, p1);
			}
			else
				synth_devs[dev]->set_instr(dev, chn, p1);

			break;

		case MIDI_CTL_CHANGE:
			if (seq_mode == SEQ_2)
			{
				if (chn > 15 || p1 > 127)
					break;

				synth_devs[dev]->chn_info[chn].controllers[p1] = w14 & 0x7f;

				if (p1 < 32)	/* Setting MSB should clear LSB to 0 */
					synth_devs[dev]->chn_info[chn].controllers[p1 + 32] = 0;

				if ((int) dev < num_synths)
				{
					int val = w14 & 0x7f;
					int i, key;

					if (p1 < 64)	/* Combine MSB and LSB */
					{
						val = ((synth_devs[dev]->
							chn_info[chn].controllers[p1 & ~32] & 0x7f) << 7)
							| (synth_devs[dev]->
							chn_info[chn].controllers[p1 | 32] & 0x7f);
						p1 &= ~32;
					}
					/* Handle all playing notes on this channel */

					key = ((int) chn << 8);

					for (i = 0; i < synth_devs[dev]->alloc.max_voice; i++)
						if ((synth_devs[dev]->alloc.map[i] & 0xff00) == key)
							synth_devs[dev]->controller(dev, i, p1, val);
				}
				else
					synth_devs[dev]->controller(dev, chn, p1, w14);
			}
			else	/* Mode 1 */
				synth_devs[dev]->controller(dev, chn, p1, w14);
			break;

		case MIDI_PITCH_BEND:
			if (seq_mode == SEQ_2)
			{
				if (chn > 15)
					break;

				synth_devs[dev]->chn_info[chn].bender_value = w14;

				if ((int) dev < num_synths)
				{
					/* Handle all playing notes on this channel */
					int i, key;

					key = (chn << 8);

					for (i = 0; i < synth_devs[dev]->alloc.max_voice; i++)
						if ((synth_devs[dev]->alloc.map[i] & 0xff00) == key)
							synth_devs[dev]->bender(dev, i, w14);
				}
				else
					synth_devs[dev]->bender(dev, chn, w14);
			}
			else	/* MODE 1 */
				synth_devs[dev]->bender(dev, chn, w14);
			break;

		default:;
	}
}

static int seq_timing_event(unsigned char *event_rec)
{
	unsigned char cmd = event_rec[1];
	unsigned int parm = *(int *) &event_rec[4];

	if (seq_mode == SEQ_2)
	{
		int ret;

		if ((ret = tmr->event(tmr_no, event_rec)) == TIMER_ARMED)
			if ((SEQ_MAX_QUEUE - qlen) >= output_threshold)
				wake_up(&seq_sleeper);
		return ret;
	}
	switch (cmd)
	{
		case TMR_WAIT_REL:
			parm += prev_event_time;

			/*
			 * NOTE!  No break here. Execution of TMR_WAIT_REL continues in the
			 * next case (TMR_WAIT_ABS)
			 */

		case TMR_WAIT_ABS:
			if (parm > 0)
			{
				long time;

				time = parm;
				prev_event_time = time;

				seq_playing = 1;
				request_sound_timer(time);

				if ((SEQ_MAX_QUEUE - qlen) >= output_threshold)
					wake_up(&seq_sleeper);
				return TIMER_ARMED;
			}
			break;

		case TMR_START:
			seq_time = jiffies;
			prev_input_time = 0;
			prev_event_time = 0;
			break;

		case TMR_STOP:
			break;

		case TMR_CONTINUE:
			break;

		case TMR_TEMPO:
			break;

		case TMR_ECHO:
			if (seq_mode == SEQ_2)
				seq_copy_to_input(event_rec, 8);
			else
			{
				parm = (parm << 8 | SEQ_ECHO);
				seq_copy_to_input((unsigned char *) &parm, 4);
			}
			break;

		default:;
	}

	return TIMER_NOT_ARMED;
}

static void seq_local_event(unsigned char *event_rec)
{
	unsigned char   cmd = event_rec[1];
	unsigned int    parm = *((unsigned int *) &event_rec[4]);

	switch (cmd)
	{
		case LOCL_STARTAUDIO:
			DMAbuf_start_devices(parm);
			break;

		default:;
	}
}

static void seq_sysex_message(unsigned char *event_rec)
{
	unsigned int dev = event_rec[1];
	int i, l = 0;
	unsigned char  *buf = &event_rec[2];

	if (dev > max_synthdev)
		return;
	if (!(synth_open_mask & (1 << dev)))
		return;
	if (!synth_devs[dev])
		return;

	l = 0;
	for (i = 0; i < 6 && buf[i] != 0xff; i++)
		l = i + 1;

	if (!synth_devs[dev]->send_sysex)
		return;
	if (l > 0)
		synth_devs[dev]->send_sysex(dev, buf, l);
}

static int play_event(unsigned char *q)
{
	/*
	 * NOTE! This routine returns
	 *   0 = normal event played.
	 *   1 = Timer armed. Suspend playback until timer callback.
	 *   2 = MIDI output buffer full. Restore queue and suspend until timer
	 */
	unsigned int *delay;

	switch (q[0])
	{
		case SEQ_NOTEOFF:
			if (synth_open_mask & (1 << 0))
				if (synth_devs[0])
					synth_devs[0]->kill_note(0, q[1], 255, q[3]);
			break;

		case SEQ_NOTEON:
			if (q[4] < 128 || q[4] == 255)
				if (synth_open_mask & (1 << 0))
					if (synth_devs[0])
						synth_devs[0]->start_note(0, q[1], q[2], q[3]);
			break;

		case SEQ_WAIT:
			delay = (unsigned int *) q;	/*
							 * Bytes 1 to 3 are containing the *
							 * delay in 'ticks'
							 */
			*delay = (*delay >> 8) & 0xffffff;

			if (*delay > 0)
			{
				long time;

				seq_playing = 1;
				time = *delay;
				prev_event_time = time;

				request_sound_timer(time);

				if ((SEQ_MAX_QUEUE - qlen) >= output_threshold)
					wake_up(&seq_sleeper);
				/*
				 * The timer is now active and will reinvoke this function
				 * after the timer expires. Return to the caller now.
				 */
				return 1;
			}
			break;

		case SEQ_PGMCHANGE:
			if (synth_open_mask & (1 << 0))
				if (synth_devs[0])
					synth_devs[0]->set_instr(0, q[1], q[2]);
			break;

		case SEQ_SYNCTIMER: 	/*
					 * Reset timer
					 */
			seq_time = jiffies;
			prev_input_time = 0;
			prev_event_time = 0;
			break;

		case SEQ_MIDIPUTC:	/*
					 * Put a midi character
					 */
			if (midi_opened[q[2]])
			{
				int dev;

				dev = q[2];

				if (dev < 0 || dev >= num_midis || midi_devs[dev] == NULL)
					break;

				if (!midi_devs[dev]->outputc(dev, q[1]))
				{
					/*
					 * Output FIFO is full. Wait one timer cycle and try again.
					 */

					seq_playing = 1;
					request_sound_timer(-1);
					return 2;
				}
				else
					midi_written[dev] = 1;
			}
			break;

		case SEQ_ECHO:
			seq_copy_to_input(q, 4);	/*
							 * Echo back to the process
							 */
			break;

		case SEQ_PRIVATE:
			if ((int) q[1] < max_synthdev)
				synth_devs[q[1]]->hw_control(q[1], q);
			break;

		case SEQ_EXTENDED:
			extended_event(q);
			break;

		case EV_CHN_VOICE:
			seq_chn_voice_event(q);
			break;

		case EV_CHN_COMMON:
			seq_chn_common_event(q);
			break;

		case EV_TIMING:
			if (seq_timing_event(q) == TIMER_ARMED)
			{
				return 1;
			}
			break;

		case EV_SEQ_LOCAL:
			seq_local_event(q);
			break;

		case EV_SYSEX:
			seq_sysex_message(q);
			break;

		default:;
	}
	return 0;
}

/* called also as timer in irq context */
static void seq_startplay(void)
{
	int this_one, action;
	unsigned long flags;

	while (qlen > 0)
	{

		spin_lock_irqsave(&lock,flags);
		qhead = ((this_one = qhead) + 1) % SEQ_MAX_QUEUE;
		qlen--;
		spin_unlock_irqrestore(&lock,flags);

		seq_playing = 1;

		if ((action = play_event(&queue[this_one * EV_SZ])))
		{		/* Suspend playback. Next timer routine invokes this routine again */
			if (action == 2)
			{
				qlen++;
				qhead = this_one;
			}
			return;
		}
	}

	seq_playing = 0;

	if ((SEQ_MAX_QUEUE - qlen) >= output_threshold)
		wake_up(&seq_sleeper);
}

static void reset_controllers(int dev, unsigned char *controller, int update_dev)
{
	int i;
	for (i = 0; i < 128; i++)
		controller[i] = ctrl_def_values[i];
}

static void setup_mode2(void)
{
	int dev;

	max_synthdev = num_synths;

	for (dev = 0; dev < num_midis; dev++)
	{
		if (midi_devs[dev] && midi_devs[dev]->converter != NULL)
		{
			synth_devs[max_synthdev++] = midi_devs[dev]->converter;
		}
	}

	for (dev = 0; dev < max_synthdev; dev++)
	{
		int chn;

		synth_devs[dev]->sysex_ptr = 0;
		synth_devs[dev]->emulation = 0;

		for (chn = 0; chn < 16; chn++)
		{
			synth_devs[dev]->chn_info[chn].pgm_num = 0;
			reset_controllers(dev,
				synth_devs[dev]->chn_info[chn].controllers,0);
			synth_devs[dev]->chn_info[chn].bender_value = (1 << 7);	/* Neutral */
			synth_devs[dev]->chn_info[chn].bender_range = 200;
		}
	}
	max_mididev = 0;
	seq_mode = SEQ_2;
}

int sequencer_open(int dev, struct file *file)
{
	int retval, mode, i;
	int level, tmp;

	if (!sequencer_ok)
		sequencer_init();

	level = ((dev & 0x0f) == SND_DEV_SEQ2) ? 2 : 1;

	dev = dev >> 4;
	mode = translate_mode(file);

	DEB(printk("sequencer_open(dev=%d)\n", dev));

	if (!sequencer_ok)
	{
/*		printk("Sound card: sequencer not initialized\n");*/
		return -ENXIO;
	}
	if (dev)		/* Patch manager device (obsolete) */
		return -ENXIO;

	if(synth_devs[dev] == NULL)
		request_module("synth0");

	if (mode == OPEN_READ)
	{
		if (!num_midis)
		{
			/*printk("Sequencer: No MIDI devices. Input not possible\n");*/
			sequencer_busy = 0;
			return -ENXIO;
		}
	}
	if (sequencer_busy)
	{
		return -EBUSY;
	}
	sequencer_busy = 1;
	obsolete_api_used = 0;

	max_mididev = num_midis;
	max_synthdev = num_synths;
	pre_event_timeout = MAX_SCHEDULE_TIMEOUT;
	seq_mode = SEQ_1;

	if (pending_timer != -1)
	{
		tmr_no = pending_timer;
		pending_timer = -1;
	}
	if (tmr_no == -1)	/* Not selected yet */
	{
		int i, best;

		best = -1;
		for (i = 0; i < num_sound_timers; i++)
			if (sound_timer_devs[i] && sound_timer_devs[i]->priority > best)
			{
				tmr_no = i;
				best = sound_timer_devs[i]->priority;
			}
		if (tmr_no == -1)	/* Should not be */
			tmr_no = 0;
	}
	tmr = sound_timer_devs[tmr_no];

	if (level == 2)
	{
		if (tmr == NULL)
		{
			/*printk("sequencer: No timer for level 2\n");*/
			sequencer_busy = 0;
			return -ENXIO;
		}
		setup_mode2();
	}
	if (!max_synthdev && !max_mididev)
	{
		sequencer_busy=0;
		return -ENXIO;
	}

	synth_open_mask = 0;

	for (i = 0; i < max_mididev; i++)
	{
		midi_opened[i] = 0;
		midi_written[i] = 0;
	}

	for (i = 0; i < max_synthdev; i++)
	{
		if (synth_devs[i]==NULL)
			continue;

		if (!try_module_get(synth_devs[i]->owner))
			continue;

		if ((tmp = synth_devs[i]->open(i, mode)) < 0)
		{
			printk(KERN_WARNING "Sequencer: Warning! Cannot open synth device #%d (%d)\n", i, tmp);
			if (synth_devs[i]->midi_dev)
				printk(KERN_WARNING "(Maps to MIDI dev #%d)\n", synth_devs[i]->midi_dev);
		}
		else
		{
			synth_open_mask |= (1 << i);
			if (synth_devs[i]->midi_dev)
				midi_opened[synth_devs[i]->midi_dev] = 1;
		}
	}

	seq_time = jiffies;

	prev_input_time = 0;
	prev_event_time = 0;

	if (seq_mode == SEQ_1 && (mode == OPEN_READ || mode == OPEN_READWRITE))
	{
		/*
		 * Initialize midi input devices
		 */

		for (i = 0; i < max_mididev; i++)
			if (!midi_opened[i] && midi_devs[i])
			{
				if (!try_module_get(midi_devs[i]->owner))
					continue;
	
				if ((retval = midi_devs[i]->open(i, mode,
					sequencer_midi_input, sequencer_midi_output)) >= 0)
				{
					midi_opened[i] = 1;
				}
			}
	}

	if (seq_mode == SEQ_2) {
		if (try_module_get(tmr->owner))
			tmr->open(tmr_no, seq_mode);
	}

 	init_waitqueue_head(&seq_sleeper);
 	init_waitqueue_head(&midi_sleeper);
	output_threshold = SEQ_MAX_QUEUE / 2;

	return 0;
}

static void seq_drain_midi_queues(void)
{
	int i, n;

	/*
	 * Give the Midi drivers time to drain their output queues
	 */

	n = 1;

	while (!signal_pending(current) && n)
	{
		n = 0;

		for (i = 0; i < max_mididev; i++)
			if (midi_opened[i] && midi_written[i])
				if (midi_devs[i]->buffer_status != NULL)
					if (midi_devs[i]->buffer_status(i))
						n++;

		/*
		 * Let's have a delay
		 */

 		if (n)
 			interruptible_sleep_on_timeout(&seq_sleeper,
						       HZ/10);
	}
}

void sequencer_release(int dev, struct file *file)
{
	int i;
	int mode = translate_mode(file);

	dev = dev >> 4;

	DEB(printk("sequencer_release(dev=%d)\n", dev));

	/*
	 * Wait until the queue is empty (if we don't have nonblock)
	 */

	if (mode != OPEN_READ && !(file->f_flags & O_NONBLOCK))
	{
		while (!signal_pending(current) && qlen > 0)
		{
  			seq_sync();
 			interruptible_sleep_on_timeout(&seq_sleeper,
						       3*HZ);
 			/* Extra delay */
		}
	}

	if (mode != OPEN_READ)
		seq_drain_midi_queues();	/*
						 * Ensure the output queues are empty
						 */
	seq_reset();
	if (mode != OPEN_READ)
		seq_drain_midi_queues();	/*
						 * Flush the all notes off messages
						 */

	for (i = 0; i < max_synthdev; i++)
	{
		if (synth_open_mask & (1 << i))	/*
						 * Actually opened
						 */
			if (synth_devs[i])
			{
				synth_devs[i]->close(i);

				module_put(synth_devs[i]->owner);

				if (synth_devs[i]->midi_dev)
					midi_opened[synth_devs[i]->midi_dev] = 0;
			}
	}

	for (i = 0; i < max_mididev; i++)
	{
		if (midi_opened[i]) {
			midi_devs[i]->close(i);
			module_put(midi_devs[i]->owner);
		}
	}

	if (seq_mode == SEQ_2) {
		tmr->close(tmr_no);
		module_put(tmr->owner);
	}

	if (obsolete_api_used)
		printk(KERN_WARNING "/dev/music: Obsolete (4 byte) API was used by %s\n", current->comm);
	sequencer_busy = 0;
}

static int seq_sync(void)
{
	if (qlen && !seq_playing && !signal_pending(current))
		seq_startplay();

 	if (qlen > 0)
 		interruptible_sleep_on_timeout(&seq_sleeper, HZ);
	return qlen;
}

static void midi_outc(int dev, unsigned char data)
{
	/*
	 * NOTE! Calls sleep(). Don't call this from interrupt.
	 */

	int n;
	unsigned long flags;

	/*
	 * This routine sends one byte to the Midi channel.
	 * If the output FIFO is full, it waits until there
	 * is space in the queue
	 */

	n = 3 * HZ;		/* Timeout */

	spin_lock_irqsave(&lock,flags);
 	while (n && !midi_devs[dev]->outputc(dev, data)) {
 		interruptible_sleep_on_timeout(&seq_sleeper, HZ/25);
  		n--;
  	}
	spin_unlock_irqrestore(&lock,flags);
}

static void seq_reset(void)
{
	/*
	 * NOTE! Calls sleep(). Don't call this from interrupt.
	 */

	int i;
	int chn;
	unsigned long flags;

	sound_stop_timer();

	seq_time = jiffies;
	prev_input_time = 0;
	prev_event_time = 0;

	qlen = qhead = qtail = 0;
	iqlen = iqhead = iqtail = 0;

	for (i = 0; i < max_synthdev; i++)
		if (synth_open_mask & (1 << i))
			if (synth_devs[i])
				synth_devs[i]->reset(i);

	if (seq_mode == SEQ_2)
	{
		for (chn = 0; chn < 16; chn++)
			for (i = 0; i < max_synthdev; i++)
				if (synth_open_mask & (1 << i))
					if (synth_devs[i])
					{
						synth_devs[i]->controller(i, chn, 123, 0);	/* All notes off */
						synth_devs[i]->controller(i, chn, 121, 0);	/* Reset all ctl */
						synth_devs[i]->bender(i, chn, 1 << 13);	/* Bender off */
					}
	}
	else	/* seq_mode == SEQ_1 */
	{
		for (i = 0; i < max_mididev; i++)
			if (midi_written[i])	/*
						 * Midi used. Some notes may still be playing
						 */
			{
				/*
				 *      Sending just a ACTIVE SENSING message should be enough to stop all
				 *      playing notes. Since there are devices not recognizing the
				 *      active sensing, we have to send some all notes off messages also.
				 */
				midi_outc(i, 0xfe);

				for (chn = 0; chn < 16; chn++)
				{
					midi_outc(i, (unsigned char) (0xb0 + (chn & 0x0f)));		/* control change */
					midi_outc(i, 0x7b);	/* All notes off */
					midi_outc(i, 0);	/* Dummy parameter */
				}

				midi_devs[i]->close(i);

				midi_written[i] = 0;
				midi_opened[i] = 0;
			}
	}

	seq_playing = 0;

	spin_lock_irqsave(&lock,flags);

	if (waitqueue_active(&seq_sleeper)) {
		/*      printk( "Sequencer Warning: Unexpected sleeping process - Waking up\n"); */
		wake_up(&seq_sleeper);
	}
	spin_unlock_irqrestore(&lock,flags);
}

static void seq_panic(void)
{
	/*
	 * This routine is called by the application in case the user
	 * wants to reset the system to the default state.
	 */

	seq_reset();

	/*
	 * Since some of the devices don't recognize the active sensing and
	 * all notes off messages, we have to shut all notes manually.
	 *
	 *      TO BE IMPLEMENTED LATER
	 */

	/*
	 * Also return the controllers to their default states
	 */
}

int sequencer_ioctl(int dev, struct file *file, unsigned int cmd, void __user *arg)
{
	int midi_dev, orig_dev, val, err;
	int mode = translate_mode(file);
	struct synth_info inf;
	struct seq_event_rec event_rec;
	unsigned long flags;
	int __user *p = arg;

	orig_dev = dev = dev >> 4;

	switch (cmd)
	{
		case SNDCTL_TMR_TIMEBASE:
		case SNDCTL_TMR_TEMPO:
		case SNDCTL_TMR_START:
		case SNDCTL_TMR_STOP:
		case SNDCTL_TMR_CONTINUE:
		case SNDCTL_TMR_METRONOME:
		case SNDCTL_TMR_SOURCE:
			if (seq_mode != SEQ_2)
				return -EINVAL;
			return tmr->ioctl(tmr_no, cmd, arg);

		case SNDCTL_TMR_SELECT:
			if (seq_mode != SEQ_2)
				return -EINVAL;
			if (get_user(pending_timer, p))
				return -EFAULT;
			if (pending_timer < 0 || pending_timer >= num_sound_timers || sound_timer_devs[pending_timer] == NULL)
			{
				pending_timer = -1;
				return -EINVAL;
			}
			val = pending_timer;
			break;

		case SNDCTL_SEQ_PANIC:
			seq_panic();
			return -EINVAL;

		case SNDCTL_SEQ_SYNC:
			if (mode == OPEN_READ)
				return 0;
			while (qlen > 0 && !signal_pending(current))
				seq_sync();
			return qlen ? -EINTR : 0;

		case SNDCTL_SEQ_RESET:
			seq_reset();
			return 0;

		case SNDCTL_SEQ_TESTMIDI:
			if (__get_user(midi_dev, p))
				return -EFAULT;
			if (midi_dev < 0 || midi_dev >= max_mididev || !midi_devs[midi_dev])
				return -ENXIO;

			if (!midi_opened[midi_dev] &&
				(err = midi_devs[midi_dev]->open(midi_dev, mode, sequencer_midi_input,
						     sequencer_midi_output)) < 0)
				return err;
			midi_opened[midi_dev] = 1;
			return 0;

		case SNDCTL_SEQ_GETINCOUNT:
			if (mode == OPEN_WRITE)
				return 0;
			val = iqlen;
			break;

		case SNDCTL_SEQ_GETOUTCOUNT:
			if (mode == OPEN_READ)
				return 0;
			val = SEQ_MAX_QUEUE - qlen;
			break;

		case SNDCTL_SEQ_GETTIME:
			if (seq_mode == SEQ_2)
				return tmr->ioctl(tmr_no, cmd, arg);
			val = jiffies - seq_time;
			break;

		case SNDCTL_SEQ_CTRLRATE:
			/*
			 * If *arg == 0, just return the current rate
			 */
			if (seq_mode == SEQ_2)
				return tmr->ioctl(tmr_no, cmd, arg);

			if (get_user(val, p))
				return -EFAULT;
			if (val != 0)
				return -EINVAL;
			val = HZ;
			break;

		case SNDCTL_SEQ_RESETSAMPLES:
		case SNDCTL_SYNTH_REMOVESAMPLE:
		case SNDCTL_SYNTH_CONTROL:
			if (get_user(dev, p))
				return -EFAULT;
			if (dev < 0 || dev >= num_synths || synth_devs[dev] == NULL)
				return -ENXIO;
			if (!(synth_open_mask & (1 << dev)) && !orig_dev)
				return -EBUSY;
			return synth_devs[dev]->ioctl(dev, cmd, arg);

		case SNDCTL_SEQ_NRSYNTHS:
			val = max_synthdev;
			break;

		case SNDCTL_SEQ_NRMIDIS:
			val = max_mididev;
			break;

		case SNDCTL_SYNTH_MEMAVL:
			if (get_user(dev, p))
				return -EFAULT;
			if (dev < 0 || dev >= num_synths || synth_devs[dev] == NULL)
				return -ENXIO;
			if (!(synth_open_mask & (1 << dev)) && !orig_dev)
				return -EBUSY;
			val = synth_devs[dev]->ioctl(dev, cmd, arg);
			break;

		case SNDCTL_FM_4OP_ENABLE:
			if (get_user(dev, p))
				return -EFAULT;
			if (dev < 0 || dev >= num_synths || synth_devs[dev] == NULL)
				return -ENXIO;
			if (!(synth_open_mask & (1 << dev)))
				return -ENXIO;
			synth_devs[dev]->ioctl(dev, cmd, arg);
			return 0;

		case SNDCTL_SYNTH_INFO:
			if (get_user(dev, &((struct synth_info __user *)arg)->device))
				return -EFAULT;
			if (dev < 0 || dev >= max_synthdev)
				return -ENXIO;
			if (!(synth_open_mask & (1 << dev)) && !orig_dev)
				return -EBUSY;
			return synth_devs[dev]->ioctl(dev, cmd, arg);

		/* Like SYNTH_INFO but returns ID in the name field */
		case SNDCTL_SYNTH_ID:
			if (get_user(dev, &((struct synth_info __user *)arg)->device))
				return -EFAULT;
			if (dev < 0 || dev >= max_synthdev)
				return -ENXIO;
			if (!(synth_open_mask & (1 << dev)) && !orig_dev)
				return -EBUSY;
			memcpy(&inf, synth_devs[dev]->info, sizeof(inf));
			strlcpy(inf.name, synth_devs[dev]->id, sizeof(inf.name));
			inf.device = dev;
			return copy_to_user(arg, &inf, sizeof(inf))?-EFAULT:0;

		case SNDCTL_SEQ_OUTOFBAND:
			if (copy_from_user(&event_rec, arg, sizeof(event_rec)))
				return -EFAULT;
			spin_lock_irqsave(&lock,flags);
			play_event(event_rec.arr);
			spin_unlock_irqrestore(&lock,flags);
			return 0;

		case SNDCTL_MIDI_INFO:
			if (get_user(dev, &((struct midi_info __user *)arg)->device))
				return -EFAULT;
			if (dev < 0 || dev >= max_mididev || !midi_devs[dev])
				return -ENXIO;
			midi_devs[dev]->info.device = dev;
			return copy_to_user(arg, &midi_devs[dev]->info, sizeof(struct midi_info))?-EFAULT:0;

		case SNDCTL_SEQ_THRESHOLD:
			if (get_user(val, p))
				return -EFAULT;
			if (val < 1)
				val = 1;
			if (val >= SEQ_MAX_QUEUE)
				val = SEQ_MAX_QUEUE - 1;
			output_threshold = val;
			return 0;

		case SNDCTL_MIDI_PRETIME:
			if (get_user(val, p))
				return -EFAULT;
			if (val < 0)
				val = 0;
			val = (HZ * val) / 10;
			pre_event_timeout = val;
			break;

		default:
			if (mode == OPEN_READ)
				return -EIO;
			if (!synth_devs[0])
				return -ENXIO;
			if (!(synth_open_mask & (1 << 0)))
				return -ENXIO;
			if (!synth_devs[0]->ioctl)
				return -EINVAL;
			return synth_devs[0]->ioctl(0, cmd, arg);
	}
	return put_user(val, p);
}

/* No kernel lock - we're using the global irq lock here */
unsigned int sequencer_poll(int dev, struct file *file, poll_table * wait)
{
	unsigned long flags;
	unsigned int mask = 0;

	dev = dev >> 4;

	spin_lock_irqsave(&lock,flags);
	/* input */
	poll_wait(file, &midi_sleeper, wait);
	if (iqlen)
		mask |= POLLIN | POLLRDNORM;

	/* output */
	poll_wait(file, &seq_sleeper, wait);
	if ((SEQ_MAX_QUEUE - qlen) >= output_threshold)
		mask |= POLLOUT | POLLWRNORM;
	spin_unlock_irqrestore(&lock,flags);
	return mask;
}


void sequencer_timer(unsigned long dummy)
{
	seq_startplay();
}
EXPORT_SYMBOL(sequencer_timer);

int note_to_freq(int note_num)
{

	/*
	 * This routine converts a midi note to a frequency (multiplied by 1000)
	 */

	int note, octave, note_freq;
	static int notes[] =
	{
		261632, 277189, 293671, 311132, 329632, 349232,
		369998, 391998, 415306, 440000, 466162, 493880
	};

#define BASE_OCTAVE	5

	octave = note_num / 12;
	note = note_num % 12;

	note_freq = notes[note];

	if (octave < BASE_OCTAVE)
		note_freq >>= (BASE_OCTAVE - octave);
	else if (octave > BASE_OCTAVE)
		note_freq <<= (octave - BASE_OCTAVE);

	/*
	 * note_freq >>= 1;
	 */

	return note_freq;
}
EXPORT_SYMBOL(note_to_freq);

unsigned long compute_finetune(unsigned long base_freq, int bend, int range,
		 int vibrato_cents)
{
	unsigned long amount;
	int negative, semitones, cents, multiplier = 1;

	if (!bend)
		return base_freq;
	if (!range)
		return base_freq;

	if (!base_freq)
		return base_freq;

	if (range >= 8192)
		range = 8192;

	bend = bend * range / 8192;	/* Convert to cents */
	bend += vibrato_cents;

	if (!bend)
		return base_freq;

	negative = bend < 0 ? 1 : 0;

	if (bend < 0)
		bend *= -1;
	if (bend > range)
		bend = range;

	/*
	   if (bend > 2399)
	   bend = 2399;
	 */
	while (bend > 2399)
	{
		multiplier *= 4;
		bend -= 2400;
	}

	semitones = bend / 100;
	cents = bend % 100;

	amount = (int) (semitone_tuning[semitones] * multiplier * cent_tuning[cents]) / 10000;

	if (negative)
		return (base_freq * 10000) / amount;	/* Bend down */
	else
		return (base_freq * amount) / 10000;	/* Bend up */
}
EXPORT_SYMBOL(compute_finetune);

void sequencer_init(void)
{
	if (sequencer_ok)
		return;
	queue = vmalloc(SEQ_MAX_QUEUE * EV_SZ);
	if (queue == NULL)
	{
		printk(KERN_ERR "sequencer: Can't allocate memory for sequencer output queue\n");
		return;
	}
	iqueue = vmalloc(SEQ_MAX_QUEUE * IEV_SZ);
	if (iqueue == NULL)
	{
		printk(KERN_ERR "sequencer: Can't allocate memory for sequencer input queue\n");
		vfree(queue);
		return;
	}
	sequencer_ok = 1;
}
EXPORT_SYMBOL(sequencer_init);

void sequencer_unload(void)
{
	vfree(queue);
	vfree(iqueue);
	queue = iqueue = NULL;
}