summaryrefslogtreecommitdiff
path: root/sound/oss/wf_midi.c
blob: 7b167b74375b5b5d3540d7dd58417ae989a57b6e (plain) (blame)
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
/*
 * sound/wf_midi.c
 *
 * The low level driver for the WaveFront ICS2115 MIDI interface(s)
 * Note that there is also an MPU-401 emulation (actually, a UART-401
 * emulation) on the CS4232 on the Tropez Plus. This code has nothing
 * to do with that interface at all.
 *
 * The interface is essentially just a UART-401, but is has the
 * interesting property of supporting what Turtle Beach called
 * "Virtual MIDI" mode. In this mode, there are effectively *two*
 * MIDI buses accessible via the interface, one that is routed
 * solely to/from the external WaveFront synthesizer and the other
 * corresponding to the pin/socket connector used to link external
 * MIDI devices to the board.
 *
 * This driver fully supports this mode, allowing two distinct
 * midi devices (/dev/midiNN and /dev/midiNN+1) to be used
 * completely independently, giving 32 channels of MIDI routing,
 * 16 to the WaveFront synth and 16 to the external MIDI bus.
 *
 * Switching between the two is accomplished externally by the driver
 * using the two otherwise unused MIDI bytes. See the code for more details.
 *
 * NOTE: VIRTUAL MIDI MODE IS ON BY DEFAULT (see wavefront.c)
 *
 * The main reason to turn off Virtual MIDI mode is when you want to
 * tightly couple the WaveFront synth with an external MIDI
 * device. You won't be able to distinguish the source of any MIDI
 * data except via SysEx ID, but thats probably OK, since for the most
 * part, the WaveFront won't be sending any MIDI data at all.
 *  
 * The main reason to turn on Virtual MIDI Mode is to provide two
 * completely independent 16-channel MIDI buses, one to the
 * WaveFront and one to any external MIDI devices. Given the 32
 * voice nature of the WaveFront, its pretty easy to find a use
 * for all 16 channels driving just that synth.
 *
 */

/*
 * Copyright (C) by Paul Barton-Davis 1998
 * Some portions of this file are derived from work that is:
 *
 *    CopyriGht (C) by Hannu Savolainen 1993-1996
 *
 * USS/Lite 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.
 */

#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/spinlock.h>
#include "sound_config.h"

#include <linux/wavefront.h>

#ifdef MODULE

struct wf_mpu_config {
	int             base;
#define	DATAPORT(d)   (d)->base
#define	COMDPORT(d)   (d)->base+1
#define	STATPORT(d)   (d)->base+1

	int             irq;
	int             opened;
	int             devno;
	int             synthno;
	int             mode;
#define MODE_MIDI	1
#define MODE_SYNTH	2

	void            (*inputintr) (int dev, unsigned char data);
	char isvirtual;                /* do virtual I/O stuff */
};

static struct wf_mpu_config  devs[2];
static struct wf_mpu_config *phys_dev = &devs[0];
static struct wf_mpu_config *virt_dev = &devs[1];

static void start_uart_mode (void);
static DEFINE_SPINLOCK(lock);

#define	OUTPUT_READY	0x40
#define	INPUT_AVAIL	0x80
#define	MPU_ACK		0xFE
#define	UART_MODE_ON	0x3F

static inline int wf_mpu_status (void)
{
	return inb (STATPORT (phys_dev));
}

static inline int input_avail (void)
{
	return !(wf_mpu_status() & INPUT_AVAIL);
}

static inline int output_ready (void)
{
	return !(wf_mpu_status() & OUTPUT_READY);
}

static inline int  read_data (void)
{
	return inb (DATAPORT (phys_dev));
}

static inline void write_data (unsigned char byte)
{
	outb (byte, DATAPORT (phys_dev));
}

/*
 * States for the input scanner (should be in dev_table.h)
 */

#define MST_SYSMSG		100	/* System message (sysx etc). */
#define MST_MTC			102	/* Midi Time Code (MTC) qframe msg */
#define MST_SONGSEL		103	/* Song select */
#define MST_SONGPOS		104	/* Song position pointer */
#define MST_TIMED		105	/* Leading timing byte rcvd */

/* buffer space check for input scanner */

#define BUFTEST(mi) if (mi->m_ptr >= MI_MAX || mi->m_ptr < 0) \
{printk(KERN_ERR "WF-MPU: Invalid buffer pointer %d/%d, s=%d\n", \
	mi->m_ptr, mi->m_left, mi->m_state);mi->m_ptr--;}

static unsigned char len_tab[] =	/* # of data bytes following a status
					 */
{
	2,				/* 8x */
	2,				/* 9x */
	2,				/* Ax */
	2,				/* Bx */
	1,				/* Cx */
	1,				/* Dx */
	2,				/* Ex */
	0				/* Fx */
};

static int
wf_mpu_input_scanner (int devno, int synthdev, unsigned char midic)

{
	struct midi_input_info *mi = &midi_devs[devno]->in_info;

	switch (mi->m_state) {
	case MST_INIT:
		switch (midic) {
		case 0xf8:
			/* Timer overflow */
			break;
		
		case 0xfc:
			break;
		
		case 0xfd:
			/* XXX do something useful with this. If there is
			   an external MIDI timer (e.g. a hardware sequencer,
			   a useful timer can be derived ...
		   
			   For now, no timer support.
			*/
			break;
		
		case 0xfe:
			return MPU_ACK;
			break;
		
		case 0xf0:
		case 0xf1:
		case 0xf2:
		case 0xf3:
		case 0xf4:
		case 0xf5:
		case 0xf6:
		case 0xf7:
			break;
		
		case 0xf9:
			break;
		
		case 0xff:
			mi->m_state = MST_SYSMSG;
			break;
		
		default:
			if (midic <= 0xef) {
				mi->m_state = MST_TIMED;
			}
			else
				printk (KERN_ERR "<MPU: Unknown event %02x> ",
					midic);
		}
		break;
	  
	case MST_TIMED:
	{
		int             msg = ((int) (midic & 0xf0) >> 4);
	  
		mi->m_state = MST_DATA;
	  
		if (msg < 8) {	/* Data byte */
	      
			msg = ((int) (mi->m_prev_status & 0xf0) >> 4);
			msg -= 8;
			mi->m_left = len_tab[msg] - 1;
	      
			mi->m_ptr = 2;
			mi->m_buf[0] = mi->m_prev_status;
			mi->m_buf[1] = midic;

			if (mi->m_left <= 0) {
				mi->m_state = MST_INIT;
				do_midi_msg (synthdev, mi->m_buf, mi->m_ptr);
				mi->m_ptr = 0;
			}
		} else if (msg == 0xf) {	/* MPU MARK */
	      
			mi->m_state = MST_INIT;

			switch (midic) {
			case 0xf8:
				break;
		    
			case 0xf9:
				break;
		    
			case 0xfc:
				break;
		    
			default:
				break;
			}
		} else {
			mi->m_prev_status = midic;
			msg -= 8;
			mi->m_left = len_tab[msg];
	      
			mi->m_ptr = 1;
			mi->m_buf[0] = midic;
	      
			if (mi->m_left <= 0) {
				mi->m_state = MST_INIT;
				do_midi_msg (synthdev, mi->m_buf, mi->m_ptr);
				mi->m_ptr = 0;
			}
		}
	}
	break;

	case MST_SYSMSG:
		switch (midic) {
		case 0xf0:
			mi->m_state = MST_SYSEX;
			break;
	    
		case 0xf1:
			mi->m_state = MST_MTC;
			break;

		case 0xf2:
			mi->m_state = MST_SONGPOS;
			mi->m_ptr = 0;
			break;
	    
		case 0xf3:
			mi->m_state = MST_SONGSEL;
			break;
	    
		case 0xf6:
			mi->m_state = MST_INIT;
	    
			/*
			 *    Real time messages
			 */
		case 0xf8:
			/* midi clock */
			mi->m_state = MST_INIT;
			/* XXX need ext MIDI timer support */
			break;
	    
		case 0xfA:
			mi->m_state = MST_INIT;
			/* XXX need ext MIDI timer support */
			break;
	    
		case 0xFB:
			mi->m_state = MST_INIT;
			/* XXX need ext MIDI timer support */
			break;
	    
		case 0xFC:
			mi->m_state = MST_INIT;
			/* XXX need ext MIDI timer support */
			break;
	    
		case 0xFE:
			/* active sensing */
			mi->m_state = MST_INIT;
			break;
	    
		case 0xff:
			mi->m_state = MST_INIT;
			break;

		default:
			printk (KERN_ERR "unknown MIDI sysmsg %0x\n", midic);
			mi->m_state = MST_INIT;
		}
		break;

	case MST_MTC:
		mi->m_state = MST_INIT;
		break;

	case MST_SYSEX:
		if (midic == 0xf7) {
			mi->m_state = MST_INIT;
		} else {
			/* XXX fix me */
		}
		break;

	case MST_SONGPOS:
		BUFTEST (mi);
		mi->m_buf[mi->m_ptr++] = midic;
		if (mi->m_ptr == 2) {
			mi->m_state = MST_INIT;
			mi->m_ptr = 0;
			/* XXX need ext MIDI timer support */
		}
		break;

	case MST_DATA:
		BUFTEST (mi);
		mi->m_buf[mi->m_ptr++] = midic;
		if ((--mi->m_left) <= 0) {
			mi->m_state = MST_INIT;
			do_midi_msg (synthdev, mi->m_buf, mi->m_ptr);
			mi->m_ptr = 0;
		}
		break;

	default:
		printk (KERN_ERR "Bad state %d ", mi->m_state);
		mi->m_state = MST_INIT;
	}

	return 1;
}

static irqreturn_t
wf_mpuintr(int irq, void *dev_id, struct pt_regs *dummy)

{
	struct wf_mpu_config *physical_dev = dev_id;
	static struct wf_mpu_config *input_dev;
	struct midi_input_info *mi = &midi_devs[physical_dev->devno]->in_info;
	int n;

	if (!input_avail()) { /* not for us */
		return IRQ_NONE;
	}

	if (mi->m_busy)
		return IRQ_HANDLED;
	spin_lock(&lock);
	mi->m_busy = 1;

	if (!input_dev) {
		input_dev = physical_dev;
	}

	n = 50; /* XXX why ? */

	do {
		unsigned char c = read_data ();
      
		if (phys_dev->isvirtual) {

			if (c == WF_EXTERNAL_SWITCH) {
				input_dev = virt_dev;
				continue;
			} else if (c == WF_INTERNAL_SWITCH) { 
				input_dev = phys_dev;
				continue;
			} /* else just leave it as it is */

		} else {
			input_dev = phys_dev;
		}

		if (input_dev->mode == MODE_SYNTH) {
	  
			wf_mpu_input_scanner (input_dev->devno,
					      input_dev->synthno, c);
	  
		} else if (input_dev->opened & OPEN_READ) {
	  
			if (input_dev->inputintr) {
				input_dev->inputintr (input_dev->devno, c);
			} 
		}

	} while (input_avail() && n-- > 0);

	mi->m_busy = 0;
	spin_unlock(&lock);
	return IRQ_HANDLED;
}

static int
wf_mpu_open (int dev, int mode,
	     void            (*input) (int dev, unsigned char data),
	     void            (*output) (int dev)
	)
{
	struct wf_mpu_config *devc;

	if (dev < 0 || dev >= num_midis || midi_devs[dev]==NULL)
		return -(ENXIO);

	if (phys_dev->devno == dev) {
		devc = phys_dev;
	} else if (phys_dev->isvirtual && virt_dev->devno == dev) {
		devc = virt_dev;
	} else {
		printk (KERN_ERR "WF-MPU: unknown device number %d\n", dev);
		return -(EINVAL);
	}

	if (devc->opened) {
		return -(EBUSY);
	}

	devc->mode = MODE_MIDI;
	devc->opened = mode;
	devc->synthno = 0;

	devc->inputintr = input;
	return 0;
}
 
static void
wf_mpu_close (int dev)
{
	struct wf_mpu_config *devc;

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

	if (phys_dev->devno == dev) {
		devc = phys_dev;
	} else if (phys_dev->isvirtual && virt_dev->devno == dev) {
		devc = virt_dev;
	} else {
		printk (KERN_ERR "WF-MPU: unknown device number %d\n", dev);
		return;
	}

	devc->mode = 0;
	devc->inputintr = NULL;
	devc->opened = 0;
}

static int
wf_mpu_out (int dev, unsigned char midi_byte)
{
	int             timeout;
	unsigned long   flags;
	static int lastoutdev = -1;
	unsigned char switchch;

	if (phys_dev->isvirtual && lastoutdev != dev) {
      
		if (dev == phys_dev->devno) { 
			switchch = WF_INTERNAL_SWITCH;
		} else if (dev == virt_dev->devno) { 
			switchch = WF_EXTERNAL_SWITCH;
		} else {
			printk (KERN_ERR "WF-MPU: bad device number %d", dev);
			return (0);
		}

		/* XXX fix me */
      
		for (timeout = 30000; timeout > 0 && !output_ready ();
		     timeout--);
      
		spin_lock_irqsave(&lock,flags);
      
		if (!output_ready ()) {
			printk (KERN_WARNING "WF-MPU: Send switch "
				"byte timeout\n");
			spin_unlock_irqrestore(&lock,flags);
			return 0;
		}
      
		write_data (switchch);
		spin_unlock_irqrestore(&lock,flags);
	} 

	lastoutdev = dev;

	/*
	 * Sometimes it takes about 30000 loops before the output becomes ready
	 * (After reset). Normally it takes just about 10 loops.
	 */

	/* XXX fix me */

	for (timeout = 30000; timeout > 0 && !output_ready (); timeout--);

	spin_lock_irqsave(&lock,flags);
	if (!output_ready ()) {
		spin_unlock_irqrestore(&lock,flags);
		printk (KERN_WARNING "WF-MPU: Send data timeout\n");
		return 0;
	}

	write_data (midi_byte);
	spin_unlock_irqrestore(&lock,flags);

	return 1;
}

static inline int wf_mpu_start_read (int dev) {
	return 0;
}

static inline int wf_mpu_end_read (int dev) {
	return 0;
}

static int wf_mpu_ioctl (int dev, unsigned cmd, void __user *arg)
{
	printk (KERN_WARNING
		"WF-MPU: Intelligent mode not supported by hardware.\n");
	return -(EINVAL);
}

static int wf_mpu_buffer_status (int dev)
{
	return 0;
}

static struct synth_operations wf_mpu_synth_operations[2];
static struct midi_operations  wf_mpu_midi_operations[2];

static struct midi_operations wf_mpu_midi_proto =
{
	.owner		= THIS_MODULE,
	.info		= {"WF-MPU MIDI", 0, MIDI_CAP_MPU401, SNDCARD_MPU401},
	.in_info	= {0},   /* in_info */
	.open		= wf_mpu_open,
	.close		= wf_mpu_close,
	.ioctl		= wf_mpu_ioctl,
	.outputc	= wf_mpu_out,
	.start_read	= wf_mpu_start_read,
	.end_read	= wf_mpu_end_read,
	.buffer_status	= wf_mpu_buffer_status,
};

static struct synth_info wf_mpu_synth_info_proto =
{"WaveFront MPU-401 interface", 0,
 SYNTH_TYPE_MIDI, MIDI_TYPE_MPU401, 0, 128, 0, 128, SYNTH_CAP_INPUT};

static struct synth_info wf_mpu_synth_info[2];

static int
wf_mpu_synth_ioctl (int dev, unsigned int cmd, void __user *arg)
{
	int             midi_dev;
	int index;

	midi_dev = synth_devs[dev]->midi_dev;

	if (midi_dev < 0 || midi_dev > num_midis || midi_devs[midi_dev]==NULL)
		return -(ENXIO);

	if (midi_dev == phys_dev->devno) {
		index = 0;
	} else if (phys_dev->isvirtual && midi_dev == virt_dev->devno) {
		index = 1;
	} else {
		return -(EINVAL);
	}

	switch (cmd) {

	case SNDCTL_SYNTH_INFO:
		if (copy_to_user(arg,
			      &wf_mpu_synth_info[index],
			      sizeof (struct synth_info)))
			return -EFAULT;
		return 0;
	
	case SNDCTL_SYNTH_MEMAVL:
		return 0x7fffffff;
	
	default:
		return -EINVAL;
	}
}

static int
wf_mpu_synth_open (int dev, int mode)
{
	int             midi_dev;
	struct wf_mpu_config *devc;

	midi_dev = synth_devs[dev]->midi_dev;

	if (midi_dev < 0 || midi_dev > num_midis || midi_devs[midi_dev]==NULL) {
		return -(ENXIO);
	}
  
	if (phys_dev->devno == midi_dev) {
		devc = phys_dev;
	} else if (phys_dev->isvirtual && virt_dev->devno == midi_dev) {
		devc = virt_dev;
	} else {
		printk (KERN_ERR "WF-MPU: unknown device number %d\n", dev);
		return -(EINVAL);
	}

	if (devc->opened) {
		return -(EBUSY);
	}
  
	devc->mode = MODE_SYNTH;
	devc->synthno = dev;
	devc->opened = mode;
	devc->inputintr = NULL;
	return 0;
}

static void
wf_mpu_synth_close (int dev)
{
	int             midi_dev;
	struct wf_mpu_config *devc;

	midi_dev = synth_devs[dev]->midi_dev;

	if (phys_dev->devno == midi_dev) {
		devc = phys_dev;
	} else if (phys_dev->isvirtual && virt_dev->devno == midi_dev) {
		devc = virt_dev;
	} else {
		printk (KERN_ERR "WF-MPU: unknown device number %d\n", dev);
		return;
	}

	devc->inputintr = NULL;
	devc->opened = 0;
	devc->mode = 0;
}

#define _MIDI_SYNTH_C_
#define MIDI_SYNTH_NAME	"WaveFront (MIDI)"
#define MIDI_SYNTH_CAPS	SYNTH_CAP_INPUT
#include "midi_synth.h"

static struct synth_operations wf_mpu_synth_proto =
{
	.owner		= THIS_MODULE,
	.id		= "WaveFront (ICS2115)",
	.info		= NULL,  /* info field, filled in during configuration */
	.midi_dev	= 0,     /* MIDI dev XXX should this be -1 ? */
	.synth_type	= SYNTH_TYPE_MIDI,
	.synth_subtype	= SAMPLE_TYPE_WAVEFRONT,
	.open		= wf_mpu_synth_open,
	.close		= wf_mpu_synth_close,
	.ioctl		= wf_mpu_synth_ioctl,
	.kill_note	= midi_synth_kill_note,
	.start_note	= midi_synth_start_note,
	.set_instr	= midi_synth_set_instr,
	.reset		= midi_synth_reset,
	.hw_control	= midi_synth_hw_control,
	.load_patch	= midi_synth_load_patch,
	.aftertouch	= midi_synth_aftertouch,
	.controller	= midi_synth_controller,
	.panning	= midi_synth_panning,
	.bender		= midi_synth_bender,
	.setup_voice	= midi_synth_setup_voice,
	.send_sysex	= midi_synth_send_sysex
};

static int
config_wf_mpu (struct wf_mpu_config *dev)

{
	int is_external;
	char *name;
	int index;

	if (dev == phys_dev) {
		name = "WaveFront internal MIDI";
		is_external = 0;
		index = 0;
		memcpy ((char *) &wf_mpu_synth_operations[index],
			(char *) &wf_mpu_synth_proto,
			sizeof (struct synth_operations));
	} else {
		name = "WaveFront external MIDI";
		is_external = 1;
		index = 1;
		/* no synth operations for an external MIDI interface */
	}

	memcpy ((char *) &wf_mpu_synth_info[dev->devno],
		(char *) &wf_mpu_synth_info_proto,
		sizeof (struct synth_info));

	strcpy (wf_mpu_synth_info[index].name, name);

	wf_mpu_synth_operations[index].midi_dev = dev->devno;
	wf_mpu_synth_operations[index].info = &wf_mpu_synth_info[index];

	memcpy ((char *) &wf_mpu_midi_operations[index],
		(char *) &wf_mpu_midi_proto,
		sizeof (struct midi_operations));
  
	if (is_external) {
		wf_mpu_midi_operations[index].converter = NULL;
	} else {
		wf_mpu_midi_operations[index].converter =
			&wf_mpu_synth_operations[index];
	}

	strcpy (wf_mpu_midi_operations[index].info.name, name);

	midi_devs[dev->devno] = &wf_mpu_midi_operations[index];
	midi_devs[dev->devno]->in_info.m_busy = 0;
	midi_devs[dev->devno]->in_info.m_state = MST_INIT;
	midi_devs[dev->devno]->in_info.m_ptr = 0;
	midi_devs[dev->devno]->in_info.m_left = 0;
	midi_devs[dev->devno]->in_info.m_prev_status = 0;

	devs[index].opened = 0;
	devs[index].mode = 0;

	return (0);
}

int virtual_midi_enable (void)

{
	if ((virt_dev->devno < 0) &&
	    (virt_dev->devno = sound_alloc_mididev()) == -1) {
		printk (KERN_ERR
			"WF-MPU: too many midi devices detected\n");
		return -1;
	}

	config_wf_mpu (virt_dev);

	phys_dev->isvirtual = 1;
	return virt_dev->devno;
}

int
virtual_midi_disable (void)

{
	unsigned long flags;

	spin_lock_irqsave(&lock,flags);

	wf_mpu_close (virt_dev->devno);
	/* no synth on virt_dev, so no need to call wf_mpu_synth_close() */
	phys_dev->isvirtual = 0;

	spin_unlock_irqrestore(&lock,flags);

	return 0;
}

int __init detect_wf_mpu (int irq, int io_base)
{
	if (!request_region(io_base, 2, "wavefront midi")) {
		printk (KERN_WARNING "WF-MPU: I/O port %x already in use.\n",
			io_base);
		return -1;
	}

	phys_dev->base = io_base;
	phys_dev->irq = irq;
	phys_dev->devno = -1;
	virt_dev->devno = -1;

	return 0;
}

int __init install_wf_mpu (void)
{
	if ((phys_dev->devno = sound_alloc_mididev()) < 0){

		printk (KERN_ERR "WF-MPU: Too many MIDI devices detected.\n");
		release_region(phys_dev->base, 2);
		return -1;
	}

	phys_dev->isvirtual = 0;

	if (config_wf_mpu (phys_dev)) {

		printk (KERN_WARNING
			"WF-MPU: configuration for MIDI device %d failed\n",
			phys_dev->devno);
		sound_unload_mididev (phys_dev->devno);

	}

	/* OK, now we're configured to handle an interrupt ... */

	if (request_irq (phys_dev->irq, wf_mpuintr, SA_INTERRUPT|SA_SHIRQ,
			 "wavefront midi", phys_dev) < 0) {

		printk (KERN_ERR "WF-MPU: Failed to allocate IRQ%d\n",
			phys_dev->irq);
		return -1;

	}

	/* This being a WaveFront (ICS-2115) emulated MPU-401, we have
	   to switch it into UART (dumb) mode, because otherwise, it
	   won't do anything at all.
	*/
  
	start_uart_mode ();

	return phys_dev->devno;
}
 
void
uninstall_wf_mpu (void)

{
	release_region (phys_dev->base, 2); 
	free_irq (phys_dev->irq, phys_dev);
	sound_unload_mididev (phys_dev->devno);

	if (virt_dev->devno >= 0) {
		sound_unload_mididev (virt_dev->devno);
	}
}

static void
start_uart_mode (void)

{
	int             ok, i;
	unsigned long   flags;

	spin_lock_irqsave(&lock,flags);

	/* XXX fix me */

	for (i = 0; i < 30000 && !output_ready (); i++);

	outb (UART_MODE_ON, COMDPORT(phys_dev));

	for (ok = 0, i = 50000; i > 0 && !ok; i--) {
		if (input_avail ()) {
			if (read_data () == MPU_ACK) {
				ok = 1;
			}
		}
	}

	spin_unlock_irqrestore(&lock,flags);
}
#endif