aboutsummaryrefslogtreecommitdiffstats
path: root/sound/oss/emu10k1/midi.c
blob: 33dea3d56c1e138bdc461e8f255bce857104766a (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
/*
 **********************************************************************
 *     midi.c - /dev/midi interface for emu10k1 driver
 *     Copyright 1999, 2000 Creative Labs, Inc.
 *
 **********************************************************************
 *
 *     Date                 Author          Summary of changes
 *     ----                 ------          ------------------
 *     October 20, 1999     Bertrand Lee    base code release
 *
 **********************************************************************
 *
 *     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., 675 Mass Ave, Cambridge, MA 02139,
 *     USA.
 *
 **********************************************************************
 */

#include <linux/module.h>
#include <linux/poll.h>
#include <linux/slab.h>
#include <linux/sched.h>
#include <linux/smp_lock.h>
#include <asm/uaccess.h>

#include "hwaccess.h"
#include "cardmo.h"
#include "cardmi.h"
#include "midi.h"

#ifdef EMU10K1_SEQUENCER
#include "../sound_config.h"
#endif

static DEFINE_SPINLOCK(midi_spinlock __attribute((unused)));

static void init_midi_hdr(struct midi_hdr *midihdr)
{
	midihdr->bufferlength = MIDIIN_BUFLEN;
	midihdr->bytesrecorded = 0;
	midihdr->flags = 0;
}

static int midiin_add_buffer(struct emu10k1_mididevice *midi_dev, struct midi_hdr **midihdrptr)
{
	struct midi_hdr *midihdr;

	if ((midihdr = (struct midi_hdr *) kmalloc(sizeof(struct midi_hdr), GFP_KERNEL)) == NULL) {
		ERROR();
		return -EINVAL;
	}

	init_midi_hdr(midihdr);

	if ((midihdr->data = (u8 *) kmalloc(MIDIIN_BUFLEN, GFP_KERNEL)) == NULL) {
		ERROR();
		kfree(midihdr);
		return -1;
	}

	if (emu10k1_mpuin_add_buffer(midi_dev->card->mpuin, midihdr) < 0) {
		ERROR();
		kfree(midihdr->data);
		kfree(midihdr);
		return -1;
	}

	*midihdrptr = midihdr;
	list_add_tail(&midihdr->list, &midi_dev->mid_hdrs);

	return 0;
}

static int emu10k1_midi_open(struct inode *inode, struct file *file)
{
	int minor = iminor(inode);
	struct emu10k1_card *card = NULL;
	struct emu10k1_mididevice *midi_dev;
	struct list_head *entry;

	DPF(2, "emu10k1_midi_open()\n");

	/* Check for correct device to open */
	list_for_each(entry, &emu10k1_devs) {
		card = list_entry(entry, struct emu10k1_card, list);

		if (card->midi_dev == minor)
			goto match;
	}

	return -ENODEV;

match:
#ifdef EMU10K1_SEQUENCER
	if (card->seq_mididev)	/* card is opened by sequencer */
		return -EBUSY;
#endif

	/* Wait for device to become free */
	down(&card->open_sem);
	while (card->open_mode & (file->f_mode << FMODE_MIDI_SHIFT)) {
		if (file->f_flags & O_NONBLOCK) {
			up(&card->open_sem);
			return -EBUSY;
		}

		up(&card->open_sem);
		interruptible_sleep_on(&card->open_wait);

		if (signal_pending(current)) {
			return -ERESTARTSYS;
		}

		down(&card->open_sem);
	}

	if ((midi_dev = (struct emu10k1_mididevice *) kmalloc(sizeof(*midi_dev), GFP_KERNEL)) == NULL)
		return -EINVAL;

	midi_dev->card = card;
	midi_dev->mistate = MIDIIN_STATE_STOPPED;
	init_waitqueue_head(&midi_dev->oWait);
	init_waitqueue_head(&midi_dev->iWait);
	midi_dev->ird = 0;
	midi_dev->iwr = 0;
	midi_dev->icnt = 0;
	INIT_LIST_HEAD(&midi_dev->mid_hdrs);

	if (file->f_mode & FMODE_READ) {
		struct midi_openinfo dsCardMidiOpenInfo;
		struct midi_hdr *midihdr1;
		struct midi_hdr *midihdr2;

		dsCardMidiOpenInfo.refdata = (unsigned long) midi_dev;

		if (emu10k1_mpuin_open(card, &dsCardMidiOpenInfo) < 0) {
			ERROR();
			kfree(midi_dev);
			return -ENODEV;
		}

		/* Add two buffers to receive sysex buffer */
		if (midiin_add_buffer(midi_dev, &midihdr1) < 0) {
			kfree(midi_dev);
			return -ENODEV;
		}

		if (midiin_add_buffer(midi_dev, &midihdr2) < 0) {
			list_del(&midihdr1->list);
			kfree(midihdr1->data);
			kfree(midihdr1);
			kfree(midi_dev);
			return -ENODEV;
		}
	}

	if (file->f_mode & FMODE_WRITE) {
		struct midi_openinfo dsCardMidiOpenInfo;

		dsCardMidiOpenInfo.refdata = (unsigned long) midi_dev;

		if (emu10k1_mpuout_open(card, &dsCardMidiOpenInfo) < 0) {
			ERROR();
			kfree(midi_dev);
			return -ENODEV;
		}
	}

	file->private_data = (void *) midi_dev;

	card->open_mode |= (file->f_mode << FMODE_MIDI_SHIFT) & (FMODE_MIDI_READ | FMODE_MIDI_WRITE);

	up(&card->open_sem);

	return nonseekable_open(inode, file);
}

static int emu10k1_midi_release(struct inode *inode, struct file *file)
{
	struct emu10k1_mididevice *midi_dev = (struct emu10k1_mididevice *) file->private_data;
	struct emu10k1_card *card;

	lock_kernel();

	card = midi_dev->card;
	DPF(2, "emu10k1_midi_release()\n");

	if (file->f_mode & FMODE_WRITE) {
		if (!(file->f_flags & O_NONBLOCK)) {

			while (!signal_pending(current) && (card->mpuout->firstmidiq != NULL)) {
				DPF(4, "Cannot close - buffers not empty\n");

				interruptible_sleep_on(&midi_dev->oWait);

			}
		}

		emu10k1_mpuout_close(card);
	}

	if (file->f_mode & FMODE_READ) {
		struct midi_hdr *midihdr;

		if (midi_dev->mistate == MIDIIN_STATE_STARTED) {
			emu10k1_mpuin_stop(card);
			midi_dev->mistate = MIDIIN_STATE_STOPPED;
		}

		emu10k1_mpuin_reset(card);
		emu10k1_mpuin_close(card);

		while (!list_empty(&midi_dev->mid_hdrs)) {
			midihdr = list_entry(midi_dev->mid_hdrs.next, struct midi_hdr, list);

			list_del(midi_dev->mid_hdrs.next);
			kfree(midihdr->data);
			kfree(midihdr);
		}
	}

	kfree(midi_dev);

	down(&card->open_sem);
	card->open_mode &= ~((file->f_mode << FMODE_MIDI_SHIFT) & (FMODE_MIDI_READ | FMODE_MIDI_WRITE));
	up(&card->open_sem);
	wake_up_interruptible(&card->open_wait);

	unlock_kernel();

	return 0;
}

static ssize_t emu10k1_midi_read(struct file *file, char __user *buffer, size_t count, loff_t * pos)
{
	struct emu10k1_mididevice *midi_dev = (struct emu10k1_mididevice *) file->private_data;
	ssize_t ret = 0;
	u16 cnt;
	unsigned long flags;

	DPD(4, "emu10k1_midi_read(), count %#x\n", (u32) count);

	if (!access_ok(VERIFY_WRITE, buffer, count))
		return -EFAULT;

	if (midi_dev->mistate == MIDIIN_STATE_STOPPED) {
		if (emu10k1_mpuin_start(midi_dev->card) < 0) {
			ERROR();
			return -EINVAL;
		}

		midi_dev->mistate = MIDIIN_STATE_STARTED;
	}

	while (count > 0) {
		cnt = MIDIIN_BUFLEN - midi_dev->ird;

		spin_lock_irqsave(&midi_spinlock, flags);

		if (midi_dev->icnt < cnt)
			cnt = midi_dev->icnt;

		spin_unlock_irqrestore(&midi_spinlock, flags);

		if (cnt > count)
			cnt = count;

		if (cnt <= 0) {
			if (file->f_flags & O_NONBLOCK)
				return ret ? ret : -EAGAIN;
			DPF(2, " Go to sleep...\n");

			interruptible_sleep_on(&midi_dev->iWait);

			if (signal_pending(current))
				return ret ? ret : -ERESTARTSYS;

			continue;
		}

		if (copy_to_user(buffer, midi_dev->iBuf + midi_dev->ird, cnt)) {
			ERROR();
			return ret ? ret : -EFAULT;
		}

		midi_dev->ird += cnt;
		midi_dev->ird %= MIDIIN_BUFLEN;

		spin_lock_irqsave(&midi_spinlock, flags);

		midi_dev->icnt -= cnt;

		spin_unlock_irqrestore(&midi_spinlock, flags);

		count -= cnt;
		buffer += cnt;
		ret += cnt;

		if (midi_dev->icnt == 0)
			break;
	}

	return ret;
}

static ssize_t emu10k1_midi_write(struct file *file, const char __user *buffer, size_t count, loff_t * pos)
{
	struct emu10k1_mididevice *midi_dev = (struct emu10k1_mididevice *) file->private_data;
	struct midi_hdr *midihdr;
	unsigned long flags;

	DPD(4, "emu10k1_midi_write(), count=%#x\n", (u32) count);

	if (!access_ok(VERIFY_READ, buffer, count))
		return -EFAULT;

	if ((midihdr = (struct midi_hdr *) kmalloc(sizeof(struct midi_hdr), GFP_KERNEL)) == NULL)
		return -EINVAL;

	midihdr->bufferlength = count;
	midihdr->bytesrecorded = 0;
	midihdr->flags = 0;

	if ((midihdr->data = (u8 *) kmalloc(count, GFP_KERNEL)) == NULL) {
		ERROR();
		kfree(midihdr);
		return -EINVAL;
	}

	if (copy_from_user(midihdr->data, buffer, count)) {
		kfree(midihdr->data);
		kfree(midihdr);
		return -EFAULT;
	}

	spin_lock_irqsave(&midi_spinlock, flags);

	if (emu10k1_mpuout_add_buffer(midi_dev->card, midihdr) < 0) {
		ERROR();
		kfree(midihdr->data);
		kfree(midihdr);
		spin_unlock_irqrestore(&midi_spinlock, flags);
		return -EINVAL;
	}

	spin_unlock_irqrestore(&midi_spinlock, flags);

	return count;
}

static unsigned int emu10k1_midi_poll(struct file *file, struct poll_table_struct *wait)
{
	struct emu10k1_mididevice *midi_dev = (struct emu10k1_mididevice *) file->private_data;
	unsigned long flags;
	unsigned int mask = 0;

	DPF(4, "emu10k1_midi_poll() called\n");

	if (file->f_mode & FMODE_WRITE)
		poll_wait(file, &midi_dev->oWait, wait);

	if (file->f_mode & FMODE_READ)
		poll_wait(file, &midi_dev->iWait, wait);

	spin_lock_irqsave(&midi_spinlock, flags);

	if (file->f_mode & FMODE_WRITE)
		mask |= POLLOUT | POLLWRNORM;

	if (file->f_mode & FMODE_READ) {
		if (midi_dev->mistate == MIDIIN_STATE_STARTED)
			if (midi_dev->icnt > 0)
				mask |= POLLIN | POLLRDNORM;
	}

	spin_unlock_irqrestore(&midi_spinlock, flags);

	return mask;
}

int emu10k1_midi_callback(unsigned long msg, unsigned long refdata, unsigned long *pmsg)
{
	struct emu10k1_mididevice *midi_dev = (struct emu10k1_mididevice *) refdata;
	struct midi_hdr *midihdr = NULL;
	unsigned long flags;
	int i;

	DPF(4, "emu10k1_midi_callback()\n");

	spin_lock_irqsave(&midi_spinlock, flags);

	switch (msg) {
	case ICARDMIDI_OUTLONGDATA:
		midihdr = (struct midi_hdr *) pmsg[2];

		kfree(midihdr->data);
		kfree(midihdr);
		wake_up_interruptible(&midi_dev->oWait);

		break;

	case ICARDMIDI_INLONGDATA:
		midihdr = (struct midi_hdr *) pmsg[2];

		for (i = 0; i < midihdr->bytesrecorded; i++) {
			midi_dev->iBuf[midi_dev->iwr++] = midihdr->data[i];
			midi_dev->iwr %= MIDIIN_BUFLEN;
		}

		midi_dev->icnt += midihdr->bytesrecorded;

		if (midi_dev->mistate == MIDIIN_STATE_STARTED) {
			init_midi_hdr(midihdr);
			emu10k1_mpuin_add_buffer(midi_dev->card->mpuin, midihdr);
			wake_up_interruptible(&midi_dev->iWait);
		}
		break;

	case ICARDMIDI_INDATA:
		{
			u8 *pBuf = (u8 *) & pmsg[1];
			u16 bytesvalid = pmsg[2];

			for (i = 0; i < bytesvalid; i++) {
				midi_dev->iBuf[midi_dev->iwr++] = pBuf[i];
				midi_dev->iwr %= MIDIIN_BUFLEN;
			}

			midi_dev->icnt += bytesvalid;
		}

		wake_up_interruptible(&midi_dev->iWait);
		break;

	default:		/* Unknown message */
		spin_unlock_irqrestore(&midi_spinlock, flags);
		return -1;
	}

	spin_unlock_irqrestore(&midi_spinlock, flags);

	return 0;
}

/* MIDI file operations */
struct file_operations emu10k1_midi_fops = {
	.owner		= THIS_MODULE,
	.read		= emu10k1_midi_read,
	.write		= emu10k1_midi_write,
	.poll		= emu10k1_midi_poll,
	.open		= emu10k1_midi_open,
	.release	= emu10k1_midi_release,
};


#ifdef EMU10K1_SEQUENCER

/* functions used for sequencer access */

int emu10k1_seq_midi_open(int dev, int mode,
				void (*input) (int dev, unsigned char data),
				void (*output) (int dev))
{
	struct emu10k1_card *card;
	struct midi_openinfo dsCardMidiOpenInfo;
	struct emu10k1_mididevice *midi_dev;

	if (midi_devs[dev] == NULL || midi_devs[dev]->devc == NULL)
		return -EINVAL;

	card = midi_devs[dev]->devc;

	if (card->open_mode)		/* card is opened native */
		return -EBUSY;
			
	DPF(2, "emu10k1_seq_midi_open()\n");
	
	if ((midi_dev = (struct emu10k1_mididevice *) kmalloc(sizeof(*midi_dev), GFP_KERNEL)) == NULL)
		return -EINVAL;

	midi_dev->card = card;
	midi_dev->mistate = MIDIIN_STATE_STOPPED;
	init_waitqueue_head(&midi_dev->oWait);
	init_waitqueue_head(&midi_dev->iWait);
	midi_dev->ird = 0;
	midi_dev->iwr = 0;
	midi_dev->icnt = 0;
	INIT_LIST_HEAD(&midi_dev->mid_hdrs);

	dsCardMidiOpenInfo.refdata = (unsigned long) midi_dev;

	if (emu10k1_mpuout_open(card, &dsCardMidiOpenInfo) < 0) {
		ERROR();
		return -ENODEV;
	}

	card->seq_mididev = midi_dev;
		
	return 0;
}

void emu10k1_seq_midi_close(int dev)
{
	struct emu10k1_card *card;

	DPF(2, "emu10k1_seq_midi_close()\n");
	if (midi_devs[dev] == NULL || midi_devs[dev]->devc == NULL)
		return;

	card = midi_devs[dev]->devc;
	emu10k1_mpuout_close(card);

	if (card->seq_mididev) {
		kfree(card->seq_mididev);
		card->seq_mididev = NULL;
	}
}

int emu10k1_seq_midi_out(int dev, unsigned char midi_byte)
{
	struct emu10k1_card *card;
	struct midi_hdr *midihdr;
	unsigned long flags;

	if (midi_devs[dev] == NULL || midi_devs[dev]->devc == NULL)
		return -EINVAL;

	card = midi_devs[dev]->devc;

	if ((midihdr = (struct midi_hdr *) kmalloc(sizeof(struct midi_hdr), GFP_KERNEL)) == NULL)
		return -EINVAL;

	midihdr->bufferlength = 1;
	midihdr->bytesrecorded = 0;
	midihdr->flags = 0;

	if ((midihdr->data = (u8 *) kmalloc(1, GFP_KERNEL)) == NULL) {
		ERROR();
		kfree(midihdr);
		return -EINVAL;
	}

	*(midihdr->data) = midi_byte;
	
	spin_lock_irqsave(&midi_spinlock, flags);

	if (emu10k1_mpuout_add_buffer(card, midihdr) < 0) {
		ERROR();
		kfree(midihdr->data);
		kfree(midihdr);
		spin_unlock_irqrestore(&midi_spinlock, flags);
		return -EINVAL;
	}

	spin_unlock_irqrestore(&midi_spinlock, flags);

	return 1;
}

int emu10k1_seq_midi_start_read(int dev)
{
	return 0;
}

int emu10k1_seq_midi_end_read(int dev)
{
	return 0;
}

void emu10k1_seq_midi_kick(int dev)
{
}

int emu10k1_seq_midi_buffer_status(int dev)
{
	int count;
	struct midi_queue *queue;
	struct emu10k1_card *card;

	if (midi_devs[dev] == NULL || midi_devs[dev]->devc == NULL)
		return -EINVAL;

	count = 0;

	card = midi_devs[dev]->devc;
	queue = card->mpuout->firstmidiq;

	while (queue != NULL) {
		count++;
		if (queue == card->mpuout->lastmidiq)
			break;

		queue = queue->next;
	}

	return count;
}

#endif