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authorLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 18:20:36 -0400
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 18:20:36 -0400
commit1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch)
tree0bba044c4ce775e45a88a51686b5d9f90697ea9d /sound/oss/midi_synth.c
Linux-2.6.12-rc2v2.6.12-rc2
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
Diffstat (limited to 'sound/oss/midi_synth.c')
-rw-r--r--sound/oss/midi_synth.c697
1 files changed, 697 insertions, 0 deletions
diff --git a/sound/oss/midi_synth.c b/sound/oss/midi_synth.c
new file mode 100644
index 000000000000..972edc62afd1
--- /dev/null
+++ b/sound/oss/midi_synth.c
@@ -0,0 +1,697 @@
1/*
2 * sound/midi_synth.c
3 *
4 * High level midi sequencer manager for dumb MIDI interfaces.
5 */
6/*
7 * Copyright (C) by Hannu Savolainen 1993-1997
8 *
9 * OSS/Free for Linux is distributed under the GNU GENERAL PUBLIC LICENSE (GPL)
10 * Version 2 (June 1991). See the "COPYING" file distributed with this software
11 * for more info.
12 */
13/*
14 * Thomas Sailer : ioctl code reworked (vmalloc/vfree removed)
15 * Andrew Veliath : fixed running status in MIDI input state machine
16 */
17#define USE_SEQ_MACROS
18#define USE_SIMPLE_MACROS
19
20#include "sound_config.h"
21
22#define _MIDI_SYNTH_C_
23
24#include "midi_synth.h"
25
26static int midi2synth[MAX_MIDI_DEV];
27static int sysex_state[MAX_MIDI_DEV] =
28{0};
29static unsigned char prev_out_status[MAX_MIDI_DEV];
30
31#define STORE(cmd) \
32{ \
33 int len; \
34 unsigned char obuf[8]; \
35 cmd; \
36 seq_input_event(obuf, len); \
37}
38
39#define _seqbuf obuf
40#define _seqbufptr 0
41#define _SEQ_ADVBUF(x) len=x
42
43void
44do_midi_msg(int synthno, unsigned char *msg, int mlen)
45{
46 switch (msg[0] & 0xf0)
47 {
48 case 0x90:
49 if (msg[2] != 0)
50 {
51 STORE(SEQ_START_NOTE(synthno, msg[0] & 0x0f, msg[1], msg[2]));
52 break;
53 }
54 msg[2] = 64;
55
56 case 0x80:
57 STORE(SEQ_STOP_NOTE(synthno, msg[0] & 0x0f, msg[1], msg[2]));
58 break;
59
60 case 0xA0:
61 STORE(SEQ_KEY_PRESSURE(synthno, msg[0] & 0x0f, msg[1], msg[2]));
62 break;
63
64 case 0xB0:
65 STORE(SEQ_CONTROL(synthno, msg[0] & 0x0f,
66 msg[1], msg[2]));
67 break;
68
69 case 0xC0:
70 STORE(SEQ_SET_PATCH(synthno, msg[0] & 0x0f, msg[1]));
71 break;
72
73 case 0xD0:
74 STORE(SEQ_CHN_PRESSURE(synthno, msg[0] & 0x0f, msg[1]));
75 break;
76
77 case 0xE0:
78 STORE(SEQ_BENDER(synthno, msg[0] & 0x0f,
79 (msg[1] & 0x7f) | ((msg[2] & 0x7f) << 7)));
80 break;
81
82 default:
83 /* printk( "MPU: Unknown midi channel message %02x\n", msg[0]); */
84 ;
85 }
86}
87
88static void
89midi_outc(int midi_dev, int data)
90{
91 int timeout;
92
93 for (timeout = 0; timeout < 3200; timeout++)
94 if (midi_devs[midi_dev]->outputc(midi_dev, (unsigned char) (data & 0xff)))
95 {
96 if (data & 0x80) /*
97 * Status byte
98 */
99 prev_out_status[midi_dev] =
100 (unsigned char) (data & 0xff); /*
101 * Store for running status
102 */
103 return; /*
104 * Mission complete
105 */
106 }
107 /*
108 * Sorry! No space on buffers.
109 */
110 printk("Midi send timed out\n");
111}
112
113static int
114prefix_cmd(int midi_dev, unsigned char status)
115{
116 if ((char *) midi_devs[midi_dev]->prefix_cmd == NULL)
117 return 1;
118
119 return midi_devs[midi_dev]->prefix_cmd(midi_dev, status);
120}
121
122static void
123midi_synth_input(int orig_dev, unsigned char data)
124{
125 int dev;
126 struct midi_input_info *inc;
127
128 static unsigned char len_tab[] = /* # of data bytes following a status
129 */
130 {
131 2, /* 8x */
132 2, /* 9x */
133 2, /* Ax */
134 2, /* Bx */
135 1, /* Cx */
136 1, /* Dx */
137 2, /* Ex */
138 0 /* Fx */
139 };
140
141 if (orig_dev < 0 || orig_dev > num_midis || midi_devs[orig_dev] == NULL)
142 return;
143
144 if (data == 0xfe) /* Ignore active sensing */
145 return;
146
147 dev = midi2synth[orig_dev];
148 inc = &midi_devs[orig_dev]->in_info;
149
150 switch (inc->m_state)
151 {
152 case MST_INIT:
153 if (data & 0x80) /* MIDI status byte */
154 {
155 if ((data & 0xf0) == 0xf0) /* Common message */
156 {
157 switch (data)
158 {
159 case 0xf0: /* Sysex */
160 inc->m_state = MST_SYSEX;
161 break; /* Sysex */
162
163 case 0xf1: /* MTC quarter frame */
164 case 0xf3: /* Song select */
165 inc->m_state = MST_DATA;
166 inc->m_ptr = 1;
167 inc->m_left = 1;
168 inc->m_buf[0] = data;
169 break;
170
171 case 0xf2: /* Song position pointer */
172 inc->m_state = MST_DATA;
173 inc->m_ptr = 1;
174 inc->m_left = 2;
175 inc->m_buf[0] = data;
176 break;
177
178 default:
179 inc->m_buf[0] = data;
180 inc->m_ptr = 1;
181 do_midi_msg(dev, inc->m_buf, inc->m_ptr);
182 inc->m_ptr = 0;
183 inc->m_left = 0;
184 }
185 } else
186 {
187 inc->m_state = MST_DATA;
188 inc->m_ptr = 1;
189 inc->m_left = len_tab[(data >> 4) - 8];
190 inc->m_buf[0] = inc->m_prev_status = data;
191 }
192 } else if (inc->m_prev_status & 0x80) {
193 /* Data byte (use running status) */
194 inc->m_ptr = 2;
195 inc->m_buf[1] = data;
196 inc->m_buf[0] = inc->m_prev_status;
197 inc->m_left = len_tab[(inc->m_buf[0] >> 4) - 8] - 1;
198 if (inc->m_left > 0)
199 inc->m_state = MST_DATA; /* Not done yet */
200 else {
201 inc->m_state = MST_INIT;
202 do_midi_msg(dev, inc->m_buf, inc->m_ptr);
203 inc->m_ptr = 0;
204 }
205 }
206 break; /* MST_INIT */
207
208 case MST_DATA:
209 inc->m_buf[inc->m_ptr++] = data;
210 if (--inc->m_left <= 0)
211 {
212 inc->m_state = MST_INIT;
213 do_midi_msg(dev, inc->m_buf, inc->m_ptr);
214 inc->m_ptr = 0;
215 }
216 break; /* MST_DATA */
217
218 case MST_SYSEX:
219 if (data == 0xf7) /* Sysex end */
220 {
221 inc->m_state = MST_INIT;
222 inc->m_left = 0;
223 inc->m_ptr = 0;
224 }
225 break; /* MST_SYSEX */
226
227 default:
228 printk("MIDI%d: Unexpected state %d (%02x)\n", orig_dev, inc->m_state, (int) data);
229 inc->m_state = MST_INIT;
230 }
231}
232
233static void
234leave_sysex(int dev)
235{
236 int orig_dev = synth_devs[dev]->midi_dev;
237 int timeout = 0;
238
239 if (!sysex_state[dev])
240 return;
241
242 sysex_state[dev] = 0;
243
244 while (!midi_devs[orig_dev]->outputc(orig_dev, 0xf7) &&
245 timeout < 1000)
246 timeout++;
247
248 sysex_state[dev] = 0;
249}
250
251static void
252midi_synth_output(int dev)
253{
254 /*
255 * Currently NOP
256 */
257}
258
259int midi_synth_ioctl(int dev, unsigned int cmd, void __user *arg)
260{
261 /*
262 * int orig_dev = synth_devs[dev]->midi_dev;
263 */
264
265 switch (cmd) {
266
267 case SNDCTL_SYNTH_INFO:
268 if (__copy_to_user(arg, synth_devs[dev]->info, sizeof(struct synth_info)))
269 return -EFAULT;
270 return 0;
271
272 case SNDCTL_SYNTH_MEMAVL:
273 return 0x7fffffff;
274
275 default:
276 return -EINVAL;
277 }
278}
279
280int
281midi_synth_kill_note(int dev, int channel, int note, int velocity)
282{
283 int orig_dev = synth_devs[dev]->midi_dev;
284 int msg, chn;
285
286 if (note < 0 || note > 127)
287 return 0;
288 if (channel < 0 || channel > 15)
289 return 0;
290 if (velocity < 0)
291 velocity = 0;
292 if (velocity > 127)
293 velocity = 127;
294
295 leave_sysex(dev);
296
297 msg = prev_out_status[orig_dev] & 0xf0;
298 chn = prev_out_status[orig_dev] & 0x0f;
299
300 if (chn == channel && ((msg == 0x90 && velocity == 64) || msg == 0x80))
301 { /*
302 * Use running status
303 */
304 if (!prefix_cmd(orig_dev, note))
305 return 0;
306
307 midi_outc(orig_dev, note);
308
309 if (msg == 0x90) /*
310 * Running status = Note on
311 */
312 midi_outc(orig_dev, 0); /*
313 * Note on with velocity 0 == note
314 * off
315 */
316 else
317 midi_outc(orig_dev, velocity);
318 } else
319 {
320 if (velocity == 64)
321 {
322 if (!prefix_cmd(orig_dev, 0x90 | (channel & 0x0f)))
323 return 0;
324 midi_outc(orig_dev, 0x90 | (channel & 0x0f)); /*
325 * Note on
326 */
327 midi_outc(orig_dev, note);
328 midi_outc(orig_dev, 0); /*
329 * Zero G
330 */
331 } else
332 {
333 if (!prefix_cmd(orig_dev, 0x80 | (channel & 0x0f)))
334 return 0;
335 midi_outc(orig_dev, 0x80 | (channel & 0x0f)); /*
336 * Note off
337 */
338 midi_outc(orig_dev, note);
339 midi_outc(orig_dev, velocity);
340 }
341 }
342
343 return 0;
344}
345
346int
347midi_synth_set_instr(int dev, int channel, int instr_no)
348{
349 int orig_dev = synth_devs[dev]->midi_dev;
350
351 if (instr_no < 0 || instr_no > 127)
352 instr_no = 0;
353 if (channel < 0 || channel > 15)
354 return 0;
355
356 leave_sysex(dev);
357
358 if (!prefix_cmd(orig_dev, 0xc0 | (channel & 0x0f)))
359 return 0;
360 midi_outc(orig_dev, 0xc0 | (channel & 0x0f)); /*
361 * Program change
362 */
363 midi_outc(orig_dev, instr_no);
364
365 return 0;
366}
367
368int
369midi_synth_start_note(int dev, int channel, int note, int velocity)
370{
371 int orig_dev = synth_devs[dev]->midi_dev;
372 int msg, chn;
373
374 if (note < 0 || note > 127)
375 return 0;
376 if (channel < 0 || channel > 15)
377 return 0;
378 if (velocity < 0)
379 velocity = 0;
380 if (velocity > 127)
381 velocity = 127;
382
383 leave_sysex(dev);
384
385 msg = prev_out_status[orig_dev] & 0xf0;
386 chn = prev_out_status[orig_dev] & 0x0f;
387
388 if (chn == channel && msg == 0x90)
389 { /*
390 * Use running status
391 */
392 if (!prefix_cmd(orig_dev, note))
393 return 0;
394 midi_outc(orig_dev, note);
395 midi_outc(orig_dev, velocity);
396 } else
397 {
398 if (!prefix_cmd(orig_dev, 0x90 | (channel & 0x0f)))
399 return 0;
400 midi_outc(orig_dev, 0x90 | (channel & 0x0f)); /*
401 * Note on
402 */
403 midi_outc(orig_dev, note);
404 midi_outc(orig_dev, velocity);
405 }
406 return 0;
407}
408
409void
410midi_synth_reset(int dev)
411{
412
413 leave_sysex(dev);
414}
415
416int
417midi_synth_open(int dev, int mode)
418{
419 int orig_dev = synth_devs[dev]->midi_dev;
420 int err;
421 struct midi_input_info *inc;
422
423 if (orig_dev < 0 || orig_dev > num_midis || midi_devs[orig_dev] == NULL)
424 return -ENXIO;
425
426 midi2synth[orig_dev] = dev;
427 sysex_state[dev] = 0;
428 prev_out_status[orig_dev] = 0;
429
430 if ((err = midi_devs[orig_dev]->open(orig_dev, mode,
431 midi_synth_input, midi_synth_output)) < 0)
432 return err;
433 inc = &midi_devs[orig_dev]->in_info;
434
435 /* save_flags(flags);
436 cli();
437 don't know against what irqhandler to protect*/
438 inc->m_busy = 0;
439 inc->m_state = MST_INIT;
440 inc->m_ptr = 0;
441 inc->m_left = 0;
442 inc->m_prev_status = 0x00;
443 /* restore_flags(flags); */
444
445 return 1;
446}
447
448void
449midi_synth_close(int dev)
450{
451 int orig_dev = synth_devs[dev]->midi_dev;
452
453 leave_sysex(dev);
454
455 /*
456 * Shut up the synths by sending just single active sensing message.
457 */
458 midi_devs[orig_dev]->outputc(orig_dev, 0xfe);
459
460 midi_devs[orig_dev]->close(orig_dev);
461}
462
463void
464midi_synth_hw_control(int dev, unsigned char *event)
465{
466}
467
468int
469midi_synth_load_patch(int dev, int format, const char __user *addr,
470 int offs, int count, int pmgr_flag)
471{
472 int orig_dev = synth_devs[dev]->midi_dev;
473
474 struct sysex_info sysex;
475 int i;
476 unsigned long left, src_offs, eox_seen = 0;
477 int first_byte = 1;
478 int hdr_size = (unsigned long) &sysex.data[0] - (unsigned long) &sysex;
479
480 leave_sysex(dev);
481
482 if (!prefix_cmd(orig_dev, 0xf0))
483 return 0;
484
485 if (format != SYSEX_PATCH)
486 {
487/* printk("MIDI Error: Invalid patch format (key) 0x%x\n", format);*/
488 return -EINVAL;
489 }
490 if (count < hdr_size)
491 {
492/* printk("MIDI Error: Patch header too short\n");*/
493 return -EINVAL;
494 }
495 count -= hdr_size;
496
497 /*
498 * Copy the header from user space but ignore the first bytes which have
499 * been transferred already.
500 */
501
502 if(copy_from_user(&((char *) &sysex)[offs], &(addr)[offs], hdr_size - offs))
503 return -EFAULT;
504
505 if (count < sysex.len)
506 {
507/* printk(KERN_WARNING "MIDI Warning: Sysex record too short (%d<%d)\n", count, (int) sysex.len);*/
508 sysex.len = count;
509 }
510 left = sysex.len;
511 src_offs = 0;
512
513 for (i = 0; i < left && !signal_pending(current); i++)
514 {
515 unsigned char data;
516
517 get_user(*(unsigned char *) &data, (unsigned char __user *) &((addr)[hdr_size + i]));
518
519 eox_seen = (i > 0 && data & 0x80); /* End of sysex */
520
521 if (eox_seen && data != 0xf7)
522 data = 0xf7;
523
524 if (i == 0)
525 {
526 if (data != 0xf0)
527 {
528 printk(KERN_WARNING "midi_synth: Sysex start missing\n");
529 return -EINVAL;
530 }
531 }
532 while (!midi_devs[orig_dev]->outputc(orig_dev, (unsigned char) (data & 0xff)) &&
533 !signal_pending(current))
534 schedule();
535
536 if (!first_byte && data & 0x80)
537 return 0;
538 first_byte = 0;
539 }
540
541 if (!eox_seen)
542 midi_outc(orig_dev, 0xf7);
543 return 0;
544}
545
546void midi_synth_panning(int dev, int channel, int pressure)
547{
548}
549
550void midi_synth_aftertouch(int dev, int channel, int pressure)
551{
552 int orig_dev = synth_devs[dev]->midi_dev;
553 int msg, chn;
554
555 if (pressure < 0 || pressure > 127)
556 return;
557 if (channel < 0 || channel > 15)
558 return;
559
560 leave_sysex(dev);
561
562 msg = prev_out_status[orig_dev] & 0xf0;
563 chn = prev_out_status[orig_dev] & 0x0f;
564
565 if (msg != 0xd0 || chn != channel) /*
566 * Test for running status
567 */
568 {
569 if (!prefix_cmd(orig_dev, 0xd0 | (channel & 0x0f)))
570 return;
571 midi_outc(orig_dev, 0xd0 | (channel & 0x0f)); /*
572 * Channel pressure
573 */
574 } else if (!prefix_cmd(orig_dev, pressure))
575 return;
576
577 midi_outc(orig_dev, pressure);
578}
579
580void
581midi_synth_controller(int dev, int channel, int ctrl_num, int value)
582{
583 int orig_dev = synth_devs[dev]->midi_dev;
584 int chn, msg;
585
586 if (ctrl_num < 0 || ctrl_num > 127)
587 return;
588 if (channel < 0 || channel > 15)
589 return;
590
591 leave_sysex(dev);
592
593 msg = prev_out_status[orig_dev] & 0xf0;
594 chn = prev_out_status[orig_dev] & 0x0f;
595
596 if (msg != 0xb0 || chn != channel)
597 {
598 if (!prefix_cmd(orig_dev, 0xb0 | (channel & 0x0f)))
599 return;
600 midi_outc(orig_dev, 0xb0 | (channel & 0x0f));
601 } else if (!prefix_cmd(orig_dev, ctrl_num))
602 return;
603
604 midi_outc(orig_dev, ctrl_num);
605 midi_outc(orig_dev, value & 0x7f);
606}
607
608void
609midi_synth_bender(int dev, int channel, int value)
610{
611 int orig_dev = synth_devs[dev]->midi_dev;
612 int msg, prev_chn;
613
614 if (channel < 0 || channel > 15)
615 return;
616
617 if (value < 0 || value > 16383)
618 return;
619
620 leave_sysex(dev);
621
622 msg = prev_out_status[orig_dev] & 0xf0;
623 prev_chn = prev_out_status[orig_dev] & 0x0f;
624
625 if (msg != 0xd0 || prev_chn != channel) /*
626 * Test for running status
627 */
628 {
629 if (!prefix_cmd(orig_dev, 0xe0 | (channel & 0x0f)))
630 return;
631 midi_outc(orig_dev, 0xe0 | (channel & 0x0f));
632 } else if (!prefix_cmd(orig_dev, value & 0x7f))
633 return;
634
635 midi_outc(orig_dev, value & 0x7f);
636 midi_outc(orig_dev, (value >> 7) & 0x7f);
637}
638
639void
640midi_synth_setup_voice(int dev, int voice, int channel)
641{
642}
643
644int
645midi_synth_send_sysex(int dev, unsigned char *bytes, int len)
646{
647 int orig_dev = synth_devs[dev]->midi_dev;
648 int i;
649
650 for (i = 0; i < len; i++)
651 {
652 switch (bytes[i])
653 {
654 case 0xf0: /* Start sysex */
655 if (!prefix_cmd(orig_dev, 0xf0))
656 return 0;
657 sysex_state[dev] = 1;
658 break;
659
660 case 0xf7: /* End sysex */
661 if (!sysex_state[dev]) /* Orphan sysex end */
662 return 0;
663 sysex_state[dev] = 0;
664 break;
665
666 default:
667 if (!sysex_state[dev])
668 return 0;
669
670 if (bytes[i] & 0x80) /* Error. Another message before sysex end */
671 {
672 bytes[i] = 0xf7; /* Sysex end */
673 sysex_state[dev] = 0;
674 }
675 }
676
677 if (!midi_devs[orig_dev]->outputc(orig_dev, bytes[i]))
678 {
679/*
680 * Hardware level buffer is full. Abort the sysex message.
681 */
682
683 int timeout = 0;
684
685 bytes[i] = 0xf7;
686 sysex_state[dev] = 0;
687
688 while (!midi_devs[orig_dev]->outputc(orig_dev, bytes[i]) &&
689 timeout < 1000)
690 timeout++;
691 }
692 if (!sysex_state[dev])
693 return 0;
694 }
695
696 return 0;
697}
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