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1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * GM/GS/XG midi module.
4 *
5 * Copyright (C) 1999 Steve Ratcliffe
6 *
7 * Based on awe_wave.c by Takashi Iwai
8 */
9/*
10 * This module is used to keep track of the current midi state.
11 * It can be used for drivers that are required to emulate midi when
12 * the hardware doesn't.
13 *
14 * It was written for a AWE64 driver, but there should be no AWE specific
15 * code in here. If there is it should be reported as a bug.
16 */
17
18#include <linux/init.h>
19#include <linux/slab.h>
20#include <linux/string.h>
21#include <linux/module.h>
22#include <sound/core.h>
23#include <sound/seq_kernel.h>
24#include <sound/seq_midi_emul.h>
25#include <sound/initval.h>
26#include <sound/asoundef.h>
27
28MODULE_AUTHOR("Takashi Iwai / Steve Ratcliffe");
29MODULE_DESCRIPTION("Advanced Linux Sound Architecture sequencer MIDI emulation.");
30MODULE_LICENSE("GPL");
31
32/* Prototypes for static functions */
33static void note_off(struct snd_midi_op *ops, void *drv,
34 struct snd_midi_channel *chan,
35 int note, int vel);
36static void do_control(struct snd_midi_op *ops, void *private,
37 struct snd_midi_channel_set *chset,
38 struct snd_midi_channel *chan,
39 int control, int value);
40static void rpn(struct snd_midi_op *ops, void *drv, struct snd_midi_channel *chan,
41 struct snd_midi_channel_set *chset);
42static void nrpn(struct snd_midi_op *ops, void *drv, struct snd_midi_channel *chan,
43 struct snd_midi_channel_set *chset);
44static void sysex(struct snd_midi_op *ops, void *private, unsigned char *sysex,
45 int len, struct snd_midi_channel_set *chset);
46static void all_sounds_off(struct snd_midi_op *ops, void *private,
47 struct snd_midi_channel *chan);
48static void all_notes_off(struct snd_midi_op *ops, void *private,
49 struct snd_midi_channel *chan);
50static void snd_midi_reset_controllers(struct snd_midi_channel *chan);
51static void reset_all_channels(struct snd_midi_channel_set *chset);
52
53
54/*
55 * Process an event in a driver independent way. This means dealing
56 * with RPN, NRPN, SysEx etc that are defined for common midi applications
57 * such as GM, GS and XG.
58 * There modes that this module will run in are:
59 * Generic MIDI - no interpretation at all, it will just save current values
60 * of controllers etc.
61 * GM - You can use all gm_ prefixed elements of chan. Controls, RPN, NRPN,
62 * SysEx will be interpreded as defined in General Midi.
63 * GS - You can use all gs_ prefixed elements of chan. Codes for GS will be
64 * interpreted.
65 * XG - You can use all xg_ prefixed elements of chan. Codes for XG will
66 * be interpreted.
67 */
68void
69snd_midi_process_event(struct snd_midi_op *ops,
70 struct snd_seq_event *ev,
71 struct snd_midi_channel_set *chanset)
72{
73 struct snd_midi_channel *chan;
74 void *drv;
75 int dest_channel = 0;
76
77 if (ev == NULL || chanset == NULL) {
78 pr_debug("ALSA: seq_midi_emul: ev or chanbase NULL (snd_midi_process_event)\n");
79 return;
80 }
81 if (chanset->channels == NULL)
82 return;
83
84 if (snd_seq_ev_is_channel_type(ev)) {
85 dest_channel = ev->data.note.channel;
86 if (dest_channel >= chanset->max_channels) {
87 pr_debug("ALSA: seq_midi_emul: dest channel is %d, max is %d\n",
88 dest_channel, chanset->max_channels);
89 return;
90 }
91 }
92
93 chan = chanset->channels + dest_channel;
94 drv = chanset->private_data;
95
96 /* EVENT_NOTE should be processed before queued */
97 if (ev->type == SNDRV_SEQ_EVENT_NOTE)
98 return;
99
100 /* Make sure that we don't have a note on that should really be
101 * a note off */
102 if (ev->type == SNDRV_SEQ_EVENT_NOTEON && ev->data.note.velocity == 0)
103 ev->type = SNDRV_SEQ_EVENT_NOTEOFF;
104
105 /* Make sure the note is within array range */
106 if (ev->type == SNDRV_SEQ_EVENT_NOTEON ||
107 ev->type == SNDRV_SEQ_EVENT_NOTEOFF ||
108 ev->type == SNDRV_SEQ_EVENT_KEYPRESS) {
109 if (ev->data.note.note >= 128)
110 return;
111 }
112
113 switch (ev->type) {
114 case SNDRV_SEQ_EVENT_NOTEON:
115 if (chan->note[ev->data.note.note] & SNDRV_MIDI_NOTE_ON) {
116 if (ops->note_off)
117 ops->note_off(drv, ev->data.note.note, 0, chan);
118 }
119 chan->note[ev->data.note.note] = SNDRV_MIDI_NOTE_ON;
120 if (ops->note_on)
121 ops->note_on(drv, ev->data.note.note, ev->data.note.velocity, chan);
122 break;
123 case SNDRV_SEQ_EVENT_NOTEOFF:
124 if (! (chan->note[ev->data.note.note] & SNDRV_MIDI_NOTE_ON))
125 break;
126 if (ops->note_off)
127 note_off(ops, drv, chan, ev->data.note.note, ev->data.note.velocity);
128 break;
129 case SNDRV_SEQ_EVENT_KEYPRESS:
130 if (ops->key_press)
131 ops->key_press(drv, ev->data.note.note, ev->data.note.velocity, chan);
132 break;
133 case SNDRV_SEQ_EVENT_CONTROLLER:
134 do_control(ops, drv, chanset, chan,
135 ev->data.control.param, ev->data.control.value);
136 break;
137 case SNDRV_SEQ_EVENT_PGMCHANGE:
138 chan->midi_program = ev->data.control.value;
139 break;
140 case SNDRV_SEQ_EVENT_PITCHBEND:
141 chan->midi_pitchbend = ev->data.control.value;
142 if (ops->control)
143 ops->control(drv, MIDI_CTL_PITCHBEND, chan);
144 break;
145 case SNDRV_SEQ_EVENT_CHANPRESS:
146 chan->midi_pressure = ev->data.control.value;
147 if (ops->control)
148 ops->control(drv, MIDI_CTL_CHAN_PRESSURE, chan);
149 break;
150 case SNDRV_SEQ_EVENT_CONTROL14:
151 /* Best guess is that this is any of the 14 bit controller values */
152 if (ev->data.control.param < 32) {
153 /* set low part first */
154 chan->control[ev->data.control.param + 32] =
155 ev->data.control.value & 0x7f;
156 do_control(ops, drv, chanset, chan,
157 ev->data.control.param,
158 ((ev->data.control.value>>7) & 0x7f));
159 } else
160 do_control(ops, drv, chanset, chan,
161 ev->data.control.param,
162 ev->data.control.value);
163 break;
164 case SNDRV_SEQ_EVENT_NONREGPARAM:
165 /* Break it back into its controller values */
166 chan->param_type = SNDRV_MIDI_PARAM_TYPE_NONREGISTERED;
167 chan->control[MIDI_CTL_MSB_DATA_ENTRY]
168 = (ev->data.control.value >> 7) & 0x7f;
169 chan->control[MIDI_CTL_LSB_DATA_ENTRY]
170 = ev->data.control.value & 0x7f;
171 chan->control[MIDI_CTL_NONREG_PARM_NUM_MSB]
172 = (ev->data.control.param >> 7) & 0x7f;
173 chan->control[MIDI_CTL_NONREG_PARM_NUM_LSB]
174 = ev->data.control.param & 0x7f;
175 nrpn(ops, drv, chan, chanset);
176 break;
177 case SNDRV_SEQ_EVENT_REGPARAM:
178 /* Break it back into its controller values */
179 chan->param_type = SNDRV_MIDI_PARAM_TYPE_REGISTERED;
180 chan->control[MIDI_CTL_MSB_DATA_ENTRY]
181 = (ev->data.control.value >> 7) & 0x7f;
182 chan->control[MIDI_CTL_LSB_DATA_ENTRY]
183 = ev->data.control.value & 0x7f;
184 chan->control[MIDI_CTL_REGIST_PARM_NUM_MSB]
185 = (ev->data.control.param >> 7) & 0x7f;
186 chan->control[MIDI_CTL_REGIST_PARM_NUM_LSB]
187 = ev->data.control.param & 0x7f;
188 rpn(ops, drv, chan, chanset);
189 break;
190 case SNDRV_SEQ_EVENT_SYSEX:
191 if ((ev->flags & SNDRV_SEQ_EVENT_LENGTH_MASK) == SNDRV_SEQ_EVENT_LENGTH_VARIABLE) {
192 unsigned char sysexbuf[64];
193 int len;
194 len = snd_seq_expand_var_event(ev, sizeof(sysexbuf), sysexbuf, 1, 0);
195 if (len > 0)
196 sysex(ops, drv, sysexbuf, len, chanset);
197 }
198 break;
199 case SNDRV_SEQ_EVENT_SONGPOS:
200 case SNDRV_SEQ_EVENT_SONGSEL:
201 case SNDRV_SEQ_EVENT_CLOCK:
202 case SNDRV_SEQ_EVENT_START:
203 case SNDRV_SEQ_EVENT_CONTINUE:
204 case SNDRV_SEQ_EVENT_STOP:
205 case SNDRV_SEQ_EVENT_QFRAME:
206 case SNDRV_SEQ_EVENT_TEMPO:
207 case SNDRV_SEQ_EVENT_TIMESIGN:
208 case SNDRV_SEQ_EVENT_KEYSIGN:
209 goto not_yet;
210 case SNDRV_SEQ_EVENT_SENSING:
211 break;
212 case SNDRV_SEQ_EVENT_CLIENT_START:
213 case SNDRV_SEQ_EVENT_CLIENT_EXIT:
214 case SNDRV_SEQ_EVENT_CLIENT_CHANGE:
215 case SNDRV_SEQ_EVENT_PORT_START:
216 case SNDRV_SEQ_EVENT_PORT_EXIT:
217 case SNDRV_SEQ_EVENT_PORT_CHANGE:
218 case SNDRV_SEQ_EVENT_ECHO:
219 not_yet:
220 default:
221 /*pr_debug("ALSA: seq_midi_emul: Unimplemented event %d\n", ev->type);*/
222 break;
223 }
224}
225EXPORT_SYMBOL(snd_midi_process_event);
226
227
228/*
229 * release note
230 */
231static void
232note_off(struct snd_midi_op *ops, void *drv, struct snd_midi_channel *chan,
233 int note, int vel)
234{
235 if (chan->gm_hold) {
236 /* Hold this note until pedal is turned off */
237 chan->note[note] |= SNDRV_MIDI_NOTE_RELEASED;
238 } else if (chan->note[note] & SNDRV_MIDI_NOTE_SOSTENUTO) {
239 /* Mark this note as release; it will be turned off when sostenuto
240 * is turned off */
241 chan->note[note] |= SNDRV_MIDI_NOTE_RELEASED;
242 } else {
243 chan->note[note] = 0;
244 if (ops->note_off)
245 ops->note_off(drv, note, vel, chan);
246 }
247}
248
249/*
250 * Do all driver independent operations for this controller and pass
251 * events that need to take place immediately to the driver.
252 */
253static void
254do_control(struct snd_midi_op *ops, void *drv, struct snd_midi_channel_set *chset,
255 struct snd_midi_channel *chan, int control, int value)
256{
257 int i;
258
259 if (control >= ARRAY_SIZE(chan->control))
260 return;
261
262 /* Switches */
263 if ((control >=64 && control <=69) || (control >= 80 && control <= 83)) {
264 /* These are all switches; either off or on so set to 0 or 127 */
265 value = (value >= 64)? 127: 0;
266 }
267 chan->control[control] = value;
268
269 switch (control) {
270 case MIDI_CTL_SUSTAIN:
271 if (value == 0) {
272 /* Sustain has been released, turn off held notes */
273 for (i = 0; i < 128; i++) {
274 if (chan->note[i] & SNDRV_MIDI_NOTE_RELEASED) {
275 chan->note[i] = SNDRV_MIDI_NOTE_OFF;
276 if (ops->note_off)
277 ops->note_off(drv, i, 0, chan);
278 }
279 }
280 }
281 break;
282 case MIDI_CTL_PORTAMENTO:
283 break;
284 case MIDI_CTL_SOSTENUTO:
285 if (value) {
286 /* Mark each note that is currently held down */
287 for (i = 0; i < 128; i++) {
288 if (chan->note[i] & SNDRV_MIDI_NOTE_ON)
289 chan->note[i] |= SNDRV_MIDI_NOTE_SOSTENUTO;
290 }
291 } else {
292 /* release all notes that were held */
293 for (i = 0; i < 128; i++) {
294 if (chan->note[i] & SNDRV_MIDI_NOTE_SOSTENUTO) {
295 chan->note[i] &= ~SNDRV_MIDI_NOTE_SOSTENUTO;
296 if (chan->note[i] & SNDRV_MIDI_NOTE_RELEASED) {
297 chan->note[i] = SNDRV_MIDI_NOTE_OFF;
298 if (ops->note_off)
299 ops->note_off(drv, i, 0, chan);
300 }
301 }
302 }
303 }
304 break;
305 case MIDI_CTL_MSB_DATA_ENTRY:
306 chan->control[MIDI_CTL_LSB_DATA_ENTRY] = 0;
307 /* fall through */
308 case MIDI_CTL_LSB_DATA_ENTRY:
309 if (chan->param_type == SNDRV_MIDI_PARAM_TYPE_REGISTERED)
310 rpn(ops, drv, chan, chset);
311 else
312 nrpn(ops, drv, chan, chset);
313 break;
314 case MIDI_CTL_REGIST_PARM_NUM_LSB:
315 case MIDI_CTL_REGIST_PARM_NUM_MSB:
316 chan->param_type = SNDRV_MIDI_PARAM_TYPE_REGISTERED;
317 break;
318 case MIDI_CTL_NONREG_PARM_NUM_LSB:
319 case MIDI_CTL_NONREG_PARM_NUM_MSB:
320 chan->param_type = SNDRV_MIDI_PARAM_TYPE_NONREGISTERED;
321 break;
322
323 case MIDI_CTL_ALL_SOUNDS_OFF:
324 all_sounds_off(ops, drv, chan);
325 break;
326
327 case MIDI_CTL_ALL_NOTES_OFF:
328 all_notes_off(ops, drv, chan);
329 break;
330
331 case MIDI_CTL_MSB_BANK:
332 if (chset->midi_mode == SNDRV_MIDI_MODE_XG) {
333 if (value == 127)
334 chan->drum_channel = 1;
335 else
336 chan->drum_channel = 0;
337 }
338 break;
339 case MIDI_CTL_LSB_BANK:
340 break;
341
342 case MIDI_CTL_RESET_CONTROLLERS:
343 snd_midi_reset_controllers(chan);
344 break;
345
346 case MIDI_CTL_SOFT_PEDAL:
347 case MIDI_CTL_LEGATO_FOOTSWITCH:
348 case MIDI_CTL_HOLD2:
349 case MIDI_CTL_SC1_SOUND_VARIATION:
350 case MIDI_CTL_SC2_TIMBRE:
351 case MIDI_CTL_SC3_RELEASE_TIME:
352 case MIDI_CTL_SC4_ATTACK_TIME:
353 case MIDI_CTL_SC5_BRIGHTNESS:
354 case MIDI_CTL_E1_REVERB_DEPTH:
355 case MIDI_CTL_E2_TREMOLO_DEPTH:
356 case MIDI_CTL_E3_CHORUS_DEPTH:
357 case MIDI_CTL_E4_DETUNE_DEPTH:
358 case MIDI_CTL_E5_PHASER_DEPTH:
359 goto notyet;
360 notyet:
361 default:
362 if (ops->control)
363 ops->control(drv, control, chan);
364 break;
365 }
366}
367
368
369/*
370 * initialize the MIDI status
371 */
372void
373snd_midi_channel_set_clear(struct snd_midi_channel_set *chset)
374{
375 int i;
376
377 chset->midi_mode = SNDRV_MIDI_MODE_GM;
378 chset->gs_master_volume = 127;
379
380 for (i = 0; i < chset->max_channels; i++) {
381 struct snd_midi_channel *chan = chset->channels + i;
382 memset(chan->note, 0, sizeof(chan->note));
383
384 chan->midi_aftertouch = 0;
385 chan->midi_pressure = 0;
386 chan->midi_program = 0;
387 chan->midi_pitchbend = 0;
388 snd_midi_reset_controllers(chan);
389 chan->gm_rpn_pitch_bend_range = 256; /* 2 semitones */
390 chan->gm_rpn_fine_tuning = 0;
391 chan->gm_rpn_coarse_tuning = 0;
392
393 if (i == 9)
394 chan->drum_channel = 1;
395 else
396 chan->drum_channel = 0;
397 }
398}
399EXPORT_SYMBOL(snd_midi_channel_set_clear);
400
401/*
402 * Process a rpn message.
403 */
404static void
405rpn(struct snd_midi_op *ops, void *drv, struct snd_midi_channel *chan,
406 struct snd_midi_channel_set *chset)
407{
408 int type;
409 int val;
410
411 if (chset->midi_mode != SNDRV_MIDI_MODE_NONE) {
412 type = (chan->control[MIDI_CTL_REGIST_PARM_NUM_MSB] << 8) |
413 chan->control[MIDI_CTL_REGIST_PARM_NUM_LSB];
414 val = (chan->control[MIDI_CTL_MSB_DATA_ENTRY] << 7) |
415 chan->control[MIDI_CTL_LSB_DATA_ENTRY];
416
417 switch (type) {
418 case 0x0000: /* Pitch bend sensitivity */
419 /* MSB only / 1 semitone per 128 */
420 chan->gm_rpn_pitch_bend_range = val;
421 break;
422
423 case 0x0001: /* fine tuning: */
424 /* MSB/LSB, 8192=center, 100/8192 cent step */
425 chan->gm_rpn_fine_tuning = val - 8192;
426 break;
427
428 case 0x0002: /* coarse tuning */
429 /* MSB only / 8192=center, 1 semitone per 128 */
430 chan->gm_rpn_coarse_tuning = val - 8192;
431 break;
432
433 case 0x7F7F: /* "lock-in" RPN */
434 /* ignored */
435 break;
436 }
437 }
438 /* should call nrpn or rpn callback here.. */
439}
440
441/*
442 * Process an nrpn message.
443 */
444static void
445nrpn(struct snd_midi_op *ops, void *drv, struct snd_midi_channel *chan,
446 struct snd_midi_channel_set *chset)
447{
448 /* parse XG NRPNs here if possible */
449 if (ops->nrpn)
450 ops->nrpn(drv, chan, chset);
451}
452
453
454/*
455 * convert channel parameter in GS sysex
456 */
457static int
458get_channel(unsigned char cmd)
459{
460 int p = cmd & 0x0f;
461 if (p == 0)
462 p = 9;
463 else if (p < 10)
464 p--;
465 return p;
466}
467
468
469/*
470 * Process a sysex message.
471 */
472static void
473sysex(struct snd_midi_op *ops, void *private, unsigned char *buf, int len,
474 struct snd_midi_channel_set *chset)
475{
476 /* GM on */
477 static unsigned char gm_on_macro[] = {
478 0x7e,0x7f,0x09,0x01,
479 };
480 /* XG on */
481 static unsigned char xg_on_macro[] = {
482 0x43,0x10,0x4c,0x00,0x00,0x7e,0x00,
483 };
484 /* GS prefix
485 * drum channel: XX=0x1?(channel), YY=0x15, ZZ=on/off
486 * reverb mode: XX=0x01, YY=0x30, ZZ=0-7
487 * chorus mode: XX=0x01, YY=0x38, ZZ=0-7
488 * master vol: XX=0x00, YY=0x04, ZZ=0-127
489 */
490 static unsigned char gs_pfx_macro[] = {
491 0x41,0x10,0x42,0x12,0x40,/*XX,YY,ZZ*/
492 };
493
494 int parsed = SNDRV_MIDI_SYSEX_NOT_PARSED;
495
496 if (len <= 0 || buf[0] != 0xf0)
497 return;
498 /* skip first byte */
499 buf++;
500 len--;
501
502 /* GM on */
503 if (len >= (int)sizeof(gm_on_macro) &&
504 memcmp(buf, gm_on_macro, sizeof(gm_on_macro)) == 0) {
505 if (chset->midi_mode != SNDRV_MIDI_MODE_GS &&
506 chset->midi_mode != SNDRV_MIDI_MODE_XG) {
507 chset->midi_mode = SNDRV_MIDI_MODE_GM;
508 reset_all_channels(chset);
509 parsed = SNDRV_MIDI_SYSEX_GM_ON;
510 }
511 }
512
513 /* GS macros */
514 else if (len >= 8 &&
515 memcmp(buf, gs_pfx_macro, sizeof(gs_pfx_macro)) == 0) {
516 if (chset->midi_mode != SNDRV_MIDI_MODE_GS &&
517 chset->midi_mode != SNDRV_MIDI_MODE_XG)
518 chset->midi_mode = SNDRV_MIDI_MODE_GS;
519
520 if (buf[5] == 0x00 && buf[6] == 0x7f && buf[7] == 0x00) {
521 /* GS reset */
522 parsed = SNDRV_MIDI_SYSEX_GS_RESET;
523 reset_all_channels(chset);
524 }
525
526 else if ((buf[5] & 0xf0) == 0x10 && buf[6] == 0x15) {
527 /* drum pattern */
528 int p = get_channel(buf[5]);
529 if (p < chset->max_channels) {
530 parsed = SNDRV_MIDI_SYSEX_GS_DRUM_CHANNEL;
531 if (buf[7])
532 chset->channels[p].drum_channel = 1;
533 else
534 chset->channels[p].drum_channel = 0;
535 }
536
537 } else if ((buf[5] & 0xf0) == 0x10 && buf[6] == 0x21) {
538 /* program */
539 int p = get_channel(buf[5]);
540 if (p < chset->max_channels &&
541 ! chset->channels[p].drum_channel) {
542 parsed = SNDRV_MIDI_SYSEX_GS_DRUM_CHANNEL;
543 chset->channels[p].midi_program = buf[7];
544 }
545
546 } else if (buf[5] == 0x01 && buf[6] == 0x30) {
547 /* reverb mode */
548 parsed = SNDRV_MIDI_SYSEX_GS_REVERB_MODE;
549 chset->gs_reverb_mode = buf[7];
550
551 } else if (buf[5] == 0x01 && buf[6] == 0x38) {
552 /* chorus mode */
553 parsed = SNDRV_MIDI_SYSEX_GS_CHORUS_MODE;
554 chset->gs_chorus_mode = buf[7];
555
556 } else if (buf[5] == 0x00 && buf[6] == 0x04) {
557 /* master volume */
558 parsed = SNDRV_MIDI_SYSEX_GS_MASTER_VOLUME;
559 chset->gs_master_volume = buf[7];
560
561 }
562 }
563
564 /* XG on */
565 else if (len >= (int)sizeof(xg_on_macro) &&
566 memcmp(buf, xg_on_macro, sizeof(xg_on_macro)) == 0) {
567 int i;
568 chset->midi_mode = SNDRV_MIDI_MODE_XG;
569 parsed = SNDRV_MIDI_SYSEX_XG_ON;
570 /* reset CC#0 for drums */
571 for (i = 0; i < chset->max_channels; i++) {
572 if (chset->channels[i].drum_channel)
573 chset->channels[i].control[MIDI_CTL_MSB_BANK] = 127;
574 else
575 chset->channels[i].control[MIDI_CTL_MSB_BANK] = 0;
576 }
577 }
578
579 if (ops->sysex)
580 ops->sysex(private, buf - 1, len + 1, parsed, chset);
581}
582
583/*
584 * all sound off
585 */
586static void
587all_sounds_off(struct snd_midi_op *ops, void *drv, struct snd_midi_channel *chan)
588{
589 int n;
590
591 if (! ops->note_terminate)
592 return;
593 for (n = 0; n < 128; n++) {
594 if (chan->note[n]) {
595 ops->note_terminate(drv, n, chan);
596 chan->note[n] = 0;
597 }
598 }
599}
600
601/*
602 * all notes off
603 */
604static void
605all_notes_off(struct snd_midi_op *ops, void *drv, struct snd_midi_channel *chan)
606{
607 int n;
608
609 if (! ops->note_off)
610 return;
611 for (n = 0; n < 128; n++) {
612 if (chan->note[n] == SNDRV_MIDI_NOTE_ON)
613 note_off(ops, drv, chan, n, 0);
614 }
615}
616
617/*
618 * Initialise a single midi channel control block.
619 */
620static void snd_midi_channel_init(struct snd_midi_channel *p, int n)
621{
622 if (p == NULL)
623 return;
624
625 memset(p, 0, sizeof(struct snd_midi_channel));
626 p->private = NULL;
627 p->number = n;
628
629 snd_midi_reset_controllers(p);
630 p->gm_rpn_pitch_bend_range = 256; /* 2 semitones */
631 p->gm_rpn_fine_tuning = 0;
632 p->gm_rpn_coarse_tuning = 0;
633
634 if (n == 9)
635 p->drum_channel = 1; /* Default ch 10 as drums */
636}
637
638/*
639 * Allocate and initialise a set of midi channel control blocks.
640 */
641static struct snd_midi_channel *snd_midi_channel_init_set(int n)
642{
643 struct snd_midi_channel *chan;
644 int i;
645
646 chan = kmalloc_array(n, sizeof(struct snd_midi_channel), GFP_KERNEL);
647 if (chan) {
648 for (i = 0; i < n; i++)
649 snd_midi_channel_init(chan+i, i);
650 }
651
652 return chan;
653}
654
655/*
656 * reset all midi channels
657 */
658static void
659reset_all_channels(struct snd_midi_channel_set *chset)
660{
661 int ch;
662 for (ch = 0; ch < chset->max_channels; ch++) {
663 struct snd_midi_channel *chan = chset->channels + ch;
664 snd_midi_reset_controllers(chan);
665 chan->gm_rpn_pitch_bend_range = 256; /* 2 semitones */
666 chan->gm_rpn_fine_tuning = 0;
667 chan->gm_rpn_coarse_tuning = 0;
668
669 if (ch == 9)
670 chan->drum_channel = 1;
671 else
672 chan->drum_channel = 0;
673 }
674}
675
676
677/*
678 * Allocate and initialise a midi channel set.
679 */
680struct snd_midi_channel_set *snd_midi_channel_alloc_set(int n)
681{
682 struct snd_midi_channel_set *chset;
683
684 chset = kmalloc(sizeof(*chset), GFP_KERNEL);
685 if (chset) {
686 chset->channels = snd_midi_channel_init_set(n);
687 chset->private_data = NULL;
688 chset->max_channels = n;
689 }
690 return chset;
691}
692EXPORT_SYMBOL(snd_midi_channel_alloc_set);
693
694/*
695 * Reset the midi controllers on a particular channel to default values.
696 */
697static void snd_midi_reset_controllers(struct snd_midi_channel *chan)
698{
699 memset(chan->control, 0, sizeof(chan->control));
700 chan->gm_volume = 127;
701 chan->gm_expression = 127;
702 chan->gm_pan = 64;
703}
704
705
706/*
707 * Free a midi channel set.
708 */
709void snd_midi_channel_free_set(struct snd_midi_channel_set *chset)
710{
711 if (chset == NULL)
712 return;
713 kfree(chset->channels);
714 kfree(chset);
715}
716EXPORT_SYMBOL(snd_midi_channel_free_set);
1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * GM/GS/XG midi module.
4 *
5 * Copyright (C) 1999 Steve Ratcliffe
6 *
7 * Based on awe_wave.c by Takashi Iwai
8 */
9/*
10 * This module is used to keep track of the current midi state.
11 * It can be used for drivers that are required to emulate midi when
12 * the hardware doesn't.
13 *
14 * It was written for a AWE64 driver, but there should be no AWE specific
15 * code in here. If there is it should be reported as a bug.
16 */
17
18#include <linux/init.h>
19#include <linux/slab.h>
20#include <linux/string.h>
21#include <linux/module.h>
22#include <sound/core.h>
23#include <sound/seq_kernel.h>
24#include <sound/seq_midi_emul.h>
25#include <sound/initval.h>
26#include <sound/asoundef.h>
27
28MODULE_AUTHOR("Takashi Iwai / Steve Ratcliffe");
29MODULE_DESCRIPTION("Advanced Linux Sound Architecture sequencer MIDI emulation.");
30MODULE_LICENSE("GPL");
31
32/* Prototypes for static functions */
33static void note_off(const struct snd_midi_op *ops, void *drv,
34 struct snd_midi_channel *chan,
35 int note, int vel);
36static void do_control(const struct snd_midi_op *ops, void *private,
37 struct snd_midi_channel_set *chset,
38 struct snd_midi_channel *chan,
39 int control, int value);
40static void rpn(const struct snd_midi_op *ops, void *drv,
41 struct snd_midi_channel *chan,
42 struct snd_midi_channel_set *chset);
43static void nrpn(const struct snd_midi_op *ops, void *drv,
44 struct snd_midi_channel *chan,
45 struct snd_midi_channel_set *chset);
46static void sysex(const struct snd_midi_op *ops, void *private,
47 unsigned char *sysex,
48 int len, struct snd_midi_channel_set *chset);
49static void all_sounds_off(const struct snd_midi_op *ops, void *private,
50 struct snd_midi_channel *chan);
51static void all_notes_off(const struct snd_midi_op *ops, void *private,
52 struct snd_midi_channel *chan);
53static void snd_midi_reset_controllers(struct snd_midi_channel *chan);
54static void reset_all_channels(struct snd_midi_channel_set *chset);
55
56
57/*
58 * Process an event in a driver independent way. This means dealing
59 * with RPN, NRPN, SysEx etc that are defined for common midi applications
60 * such as GM, GS and XG.
61 * There modes that this module will run in are:
62 * Generic MIDI - no interpretation at all, it will just save current values
63 * of controllers etc.
64 * GM - You can use all gm_ prefixed elements of chan. Controls, RPN, NRPN,
65 * SysEx will be interpreded as defined in General Midi.
66 * GS - You can use all gs_ prefixed elements of chan. Codes for GS will be
67 * interpreted.
68 * XG - You can use all xg_ prefixed elements of chan. Codes for XG will
69 * be interpreted.
70 */
71void
72snd_midi_process_event(const struct snd_midi_op *ops,
73 struct snd_seq_event *ev,
74 struct snd_midi_channel_set *chanset)
75{
76 struct snd_midi_channel *chan;
77 void *drv;
78 int dest_channel = 0;
79
80 if (ev == NULL || chanset == NULL) {
81 pr_debug("ALSA: seq_midi_emul: ev or chanbase NULL (snd_midi_process_event)\n");
82 return;
83 }
84 if (chanset->channels == NULL)
85 return;
86
87 if (snd_seq_ev_is_channel_type(ev)) {
88 dest_channel = ev->data.note.channel;
89 if (dest_channel >= chanset->max_channels) {
90 pr_debug("ALSA: seq_midi_emul: dest channel is %d, max is %d\n",
91 dest_channel, chanset->max_channels);
92 return;
93 }
94 }
95
96 chan = chanset->channels + dest_channel;
97 drv = chanset->private_data;
98
99 /* EVENT_NOTE should be processed before queued */
100 if (ev->type == SNDRV_SEQ_EVENT_NOTE)
101 return;
102
103 /* Make sure that we don't have a note on that should really be
104 * a note off */
105 if (ev->type == SNDRV_SEQ_EVENT_NOTEON && ev->data.note.velocity == 0)
106 ev->type = SNDRV_SEQ_EVENT_NOTEOFF;
107
108 /* Make sure the note is within array range */
109 if (ev->type == SNDRV_SEQ_EVENT_NOTEON ||
110 ev->type == SNDRV_SEQ_EVENT_NOTEOFF ||
111 ev->type == SNDRV_SEQ_EVENT_KEYPRESS) {
112 if (ev->data.note.note >= 128)
113 return;
114 }
115
116 switch (ev->type) {
117 case SNDRV_SEQ_EVENT_NOTEON:
118 if (chan->note[ev->data.note.note] & SNDRV_MIDI_NOTE_ON) {
119 if (ops->note_off)
120 ops->note_off(drv, ev->data.note.note, 0, chan);
121 }
122 chan->note[ev->data.note.note] = SNDRV_MIDI_NOTE_ON;
123 if (ops->note_on)
124 ops->note_on(drv, ev->data.note.note, ev->data.note.velocity, chan);
125 break;
126 case SNDRV_SEQ_EVENT_NOTEOFF:
127 if (! (chan->note[ev->data.note.note] & SNDRV_MIDI_NOTE_ON))
128 break;
129 if (ops->note_off)
130 note_off(ops, drv, chan, ev->data.note.note, ev->data.note.velocity);
131 break;
132 case SNDRV_SEQ_EVENT_KEYPRESS:
133 if (ops->key_press)
134 ops->key_press(drv, ev->data.note.note, ev->data.note.velocity, chan);
135 break;
136 case SNDRV_SEQ_EVENT_CONTROLLER:
137 do_control(ops, drv, chanset, chan,
138 ev->data.control.param, ev->data.control.value);
139 break;
140 case SNDRV_SEQ_EVENT_PGMCHANGE:
141 chan->midi_program = ev->data.control.value;
142 break;
143 case SNDRV_SEQ_EVENT_PITCHBEND:
144 chan->midi_pitchbend = ev->data.control.value;
145 if (ops->control)
146 ops->control(drv, MIDI_CTL_PITCHBEND, chan);
147 break;
148 case SNDRV_SEQ_EVENT_CHANPRESS:
149 chan->midi_pressure = ev->data.control.value;
150 if (ops->control)
151 ops->control(drv, MIDI_CTL_CHAN_PRESSURE, chan);
152 break;
153 case SNDRV_SEQ_EVENT_CONTROL14:
154 /* Best guess is that this is any of the 14 bit controller values */
155 if (ev->data.control.param < 32) {
156 /* set low part first */
157 chan->control[ev->data.control.param + 32] =
158 ev->data.control.value & 0x7f;
159 do_control(ops, drv, chanset, chan,
160 ev->data.control.param,
161 ((ev->data.control.value>>7) & 0x7f));
162 } else
163 do_control(ops, drv, chanset, chan,
164 ev->data.control.param,
165 ev->data.control.value);
166 break;
167 case SNDRV_SEQ_EVENT_NONREGPARAM:
168 /* Break it back into its controller values */
169 chan->param_type = SNDRV_MIDI_PARAM_TYPE_NONREGISTERED;
170 chan->control[MIDI_CTL_MSB_DATA_ENTRY]
171 = (ev->data.control.value >> 7) & 0x7f;
172 chan->control[MIDI_CTL_LSB_DATA_ENTRY]
173 = ev->data.control.value & 0x7f;
174 chan->control[MIDI_CTL_NONREG_PARM_NUM_MSB]
175 = (ev->data.control.param >> 7) & 0x7f;
176 chan->control[MIDI_CTL_NONREG_PARM_NUM_LSB]
177 = ev->data.control.param & 0x7f;
178 nrpn(ops, drv, chan, chanset);
179 break;
180 case SNDRV_SEQ_EVENT_REGPARAM:
181 /* Break it back into its controller values */
182 chan->param_type = SNDRV_MIDI_PARAM_TYPE_REGISTERED;
183 chan->control[MIDI_CTL_MSB_DATA_ENTRY]
184 = (ev->data.control.value >> 7) & 0x7f;
185 chan->control[MIDI_CTL_LSB_DATA_ENTRY]
186 = ev->data.control.value & 0x7f;
187 chan->control[MIDI_CTL_REGIST_PARM_NUM_MSB]
188 = (ev->data.control.param >> 7) & 0x7f;
189 chan->control[MIDI_CTL_REGIST_PARM_NUM_LSB]
190 = ev->data.control.param & 0x7f;
191 rpn(ops, drv, chan, chanset);
192 break;
193 case SNDRV_SEQ_EVENT_SYSEX:
194 if ((ev->flags & SNDRV_SEQ_EVENT_LENGTH_MASK) == SNDRV_SEQ_EVENT_LENGTH_VARIABLE) {
195 unsigned char sysexbuf[64];
196 int len;
197 len = snd_seq_expand_var_event(ev, sizeof(sysexbuf), sysexbuf, 1, 0);
198 if (len > 0)
199 sysex(ops, drv, sysexbuf, len, chanset);
200 }
201 break;
202 case SNDRV_SEQ_EVENT_SONGPOS:
203 case SNDRV_SEQ_EVENT_SONGSEL:
204 case SNDRV_SEQ_EVENT_CLOCK:
205 case SNDRV_SEQ_EVENT_START:
206 case SNDRV_SEQ_EVENT_CONTINUE:
207 case SNDRV_SEQ_EVENT_STOP:
208 case SNDRV_SEQ_EVENT_QFRAME:
209 case SNDRV_SEQ_EVENT_TEMPO:
210 case SNDRV_SEQ_EVENT_TIMESIGN:
211 case SNDRV_SEQ_EVENT_KEYSIGN:
212 goto not_yet;
213 case SNDRV_SEQ_EVENT_SENSING:
214 break;
215 case SNDRV_SEQ_EVENT_CLIENT_START:
216 case SNDRV_SEQ_EVENT_CLIENT_EXIT:
217 case SNDRV_SEQ_EVENT_CLIENT_CHANGE:
218 case SNDRV_SEQ_EVENT_PORT_START:
219 case SNDRV_SEQ_EVENT_PORT_EXIT:
220 case SNDRV_SEQ_EVENT_PORT_CHANGE:
221 case SNDRV_SEQ_EVENT_ECHO:
222 not_yet:
223 default:
224 /*pr_debug("ALSA: seq_midi_emul: Unimplemented event %d\n", ev->type);*/
225 break;
226 }
227}
228EXPORT_SYMBOL(snd_midi_process_event);
229
230
231/*
232 * release note
233 */
234static void
235note_off(const struct snd_midi_op *ops, void *drv,
236 struct snd_midi_channel *chan,
237 int note, int vel)
238{
239 if (chan->gm_hold) {
240 /* Hold this note until pedal is turned off */
241 chan->note[note] |= SNDRV_MIDI_NOTE_RELEASED;
242 } else if (chan->note[note] & SNDRV_MIDI_NOTE_SOSTENUTO) {
243 /* Mark this note as release; it will be turned off when sostenuto
244 * is turned off */
245 chan->note[note] |= SNDRV_MIDI_NOTE_RELEASED;
246 } else {
247 chan->note[note] = 0;
248 if (ops->note_off)
249 ops->note_off(drv, note, vel, chan);
250 }
251}
252
253/*
254 * Do all driver independent operations for this controller and pass
255 * events that need to take place immediately to the driver.
256 */
257static void
258do_control(const struct snd_midi_op *ops, void *drv,
259 struct snd_midi_channel_set *chset,
260 struct snd_midi_channel *chan, int control, int value)
261{
262 int i;
263
264 if (control >= ARRAY_SIZE(chan->control))
265 return;
266
267 /* Switches */
268 if ((control >=64 && control <=69) || (control >= 80 && control <= 83)) {
269 /* These are all switches; either off or on so set to 0 or 127 */
270 value = (value >= 64)? 127: 0;
271 }
272 chan->control[control] = value;
273
274 switch (control) {
275 case MIDI_CTL_SUSTAIN:
276 if (value == 0) {
277 /* Sustain has been released, turn off held notes */
278 for (i = 0; i < 128; i++) {
279 if (chan->note[i] & SNDRV_MIDI_NOTE_RELEASED) {
280 chan->note[i] = SNDRV_MIDI_NOTE_OFF;
281 if (ops->note_off)
282 ops->note_off(drv, i, 0, chan);
283 }
284 }
285 }
286 break;
287 case MIDI_CTL_PORTAMENTO:
288 break;
289 case MIDI_CTL_SOSTENUTO:
290 if (value) {
291 /* Mark each note that is currently held down */
292 for (i = 0; i < 128; i++) {
293 if (chan->note[i] & SNDRV_MIDI_NOTE_ON)
294 chan->note[i] |= SNDRV_MIDI_NOTE_SOSTENUTO;
295 }
296 } else {
297 /* release all notes that were held */
298 for (i = 0; i < 128; i++) {
299 if (chan->note[i] & SNDRV_MIDI_NOTE_SOSTENUTO) {
300 chan->note[i] &= ~SNDRV_MIDI_NOTE_SOSTENUTO;
301 if (chan->note[i] & SNDRV_MIDI_NOTE_RELEASED) {
302 chan->note[i] = SNDRV_MIDI_NOTE_OFF;
303 if (ops->note_off)
304 ops->note_off(drv, i, 0, chan);
305 }
306 }
307 }
308 }
309 break;
310 case MIDI_CTL_MSB_DATA_ENTRY:
311 chan->control[MIDI_CTL_LSB_DATA_ENTRY] = 0;
312 fallthrough;
313 case MIDI_CTL_LSB_DATA_ENTRY:
314 if (chan->param_type == SNDRV_MIDI_PARAM_TYPE_REGISTERED)
315 rpn(ops, drv, chan, chset);
316 else
317 nrpn(ops, drv, chan, chset);
318 break;
319 case MIDI_CTL_REGIST_PARM_NUM_LSB:
320 case MIDI_CTL_REGIST_PARM_NUM_MSB:
321 chan->param_type = SNDRV_MIDI_PARAM_TYPE_REGISTERED;
322 break;
323 case MIDI_CTL_NONREG_PARM_NUM_LSB:
324 case MIDI_CTL_NONREG_PARM_NUM_MSB:
325 chan->param_type = SNDRV_MIDI_PARAM_TYPE_NONREGISTERED;
326 break;
327
328 case MIDI_CTL_ALL_SOUNDS_OFF:
329 all_sounds_off(ops, drv, chan);
330 break;
331
332 case MIDI_CTL_ALL_NOTES_OFF:
333 all_notes_off(ops, drv, chan);
334 break;
335
336 case MIDI_CTL_MSB_BANK:
337 if (chset->midi_mode == SNDRV_MIDI_MODE_XG) {
338 if (value == 127)
339 chan->drum_channel = 1;
340 else
341 chan->drum_channel = 0;
342 }
343 break;
344 case MIDI_CTL_LSB_BANK:
345 break;
346
347 case MIDI_CTL_RESET_CONTROLLERS:
348 snd_midi_reset_controllers(chan);
349 break;
350
351 case MIDI_CTL_SOFT_PEDAL:
352 case MIDI_CTL_LEGATO_FOOTSWITCH:
353 case MIDI_CTL_HOLD2:
354 case MIDI_CTL_SC1_SOUND_VARIATION:
355 case MIDI_CTL_SC2_TIMBRE:
356 case MIDI_CTL_SC3_RELEASE_TIME:
357 case MIDI_CTL_SC4_ATTACK_TIME:
358 case MIDI_CTL_SC5_BRIGHTNESS:
359 case MIDI_CTL_E1_REVERB_DEPTH:
360 case MIDI_CTL_E2_TREMOLO_DEPTH:
361 case MIDI_CTL_E3_CHORUS_DEPTH:
362 case MIDI_CTL_E4_DETUNE_DEPTH:
363 case MIDI_CTL_E5_PHASER_DEPTH:
364 goto notyet;
365 notyet:
366 default:
367 if (ops->control)
368 ops->control(drv, control, chan);
369 break;
370 }
371}
372
373
374/*
375 * initialize the MIDI status
376 */
377void
378snd_midi_channel_set_clear(struct snd_midi_channel_set *chset)
379{
380 int i;
381
382 chset->midi_mode = SNDRV_MIDI_MODE_GM;
383 chset->gs_master_volume = 127;
384
385 for (i = 0; i < chset->max_channels; i++) {
386 struct snd_midi_channel *chan = chset->channels + i;
387 memset(chan->note, 0, sizeof(chan->note));
388
389 chan->midi_aftertouch = 0;
390 chan->midi_pressure = 0;
391 chan->midi_program = 0;
392 chan->midi_pitchbend = 0;
393 snd_midi_reset_controllers(chan);
394 chan->gm_rpn_pitch_bend_range = 256; /* 2 semitones */
395 chan->gm_rpn_fine_tuning = 0;
396 chan->gm_rpn_coarse_tuning = 0;
397
398 if (i == 9)
399 chan->drum_channel = 1;
400 else
401 chan->drum_channel = 0;
402 }
403}
404EXPORT_SYMBOL(snd_midi_channel_set_clear);
405
406/*
407 * Process a rpn message.
408 */
409static void
410rpn(const struct snd_midi_op *ops, void *drv, struct snd_midi_channel *chan,
411 struct snd_midi_channel_set *chset)
412{
413 int type;
414 int val;
415
416 if (chset->midi_mode != SNDRV_MIDI_MODE_NONE) {
417 type = (chan->control[MIDI_CTL_REGIST_PARM_NUM_MSB] << 8) |
418 chan->control[MIDI_CTL_REGIST_PARM_NUM_LSB];
419 val = (chan->control[MIDI_CTL_MSB_DATA_ENTRY] << 7) |
420 chan->control[MIDI_CTL_LSB_DATA_ENTRY];
421
422 switch (type) {
423 case 0x0000: /* Pitch bend sensitivity */
424 /* MSB only / 1 semitone per 128 */
425 chan->gm_rpn_pitch_bend_range = val;
426 break;
427
428 case 0x0001: /* fine tuning: */
429 /* MSB/LSB, 8192=center, 100/8192 cent step */
430 chan->gm_rpn_fine_tuning = val - 8192;
431 break;
432
433 case 0x0002: /* coarse tuning */
434 /* MSB only / 8192=center, 1 semitone per 128 */
435 chan->gm_rpn_coarse_tuning = val - 8192;
436 break;
437
438 case 0x7F7F: /* "lock-in" RPN */
439 /* ignored */
440 break;
441 }
442 }
443 /* should call nrpn or rpn callback here.. */
444}
445
446/*
447 * Process an nrpn message.
448 */
449static void
450nrpn(const struct snd_midi_op *ops, void *drv, struct snd_midi_channel *chan,
451 struct snd_midi_channel_set *chset)
452{
453 /* parse XG NRPNs here if possible */
454 if (ops->nrpn)
455 ops->nrpn(drv, chan, chset);
456}
457
458
459/*
460 * convert channel parameter in GS sysex
461 */
462static int
463get_channel(unsigned char cmd)
464{
465 int p = cmd & 0x0f;
466 if (p == 0)
467 p = 9;
468 else if (p < 10)
469 p--;
470 return p;
471}
472
473
474/*
475 * Process a sysex message.
476 */
477static void
478sysex(const struct snd_midi_op *ops, void *private, unsigned char *buf, int len,
479 struct snd_midi_channel_set *chset)
480{
481 /* GM on */
482 static const unsigned char gm_on_macro[] = {
483 0x7e,0x7f,0x09,0x01,
484 };
485 /* XG on */
486 static const unsigned char xg_on_macro[] = {
487 0x43,0x10,0x4c,0x00,0x00,0x7e,0x00,
488 };
489 /* GS prefix
490 * drum channel: XX=0x1?(channel), YY=0x15, ZZ=on/off
491 * reverb mode: XX=0x01, YY=0x30, ZZ=0-7
492 * chorus mode: XX=0x01, YY=0x38, ZZ=0-7
493 * master vol: XX=0x00, YY=0x04, ZZ=0-127
494 */
495 static const unsigned char gs_pfx_macro[] = {
496 0x41,0x10,0x42,0x12,0x40,/*XX,YY,ZZ*/
497 };
498
499 int parsed = SNDRV_MIDI_SYSEX_NOT_PARSED;
500
501 if (len <= 0 || buf[0] != 0xf0)
502 return;
503 /* skip first byte */
504 buf++;
505 len--;
506
507 /* GM on */
508 if (len >= (int)sizeof(gm_on_macro) &&
509 memcmp(buf, gm_on_macro, sizeof(gm_on_macro)) == 0) {
510 if (chset->midi_mode != SNDRV_MIDI_MODE_GS &&
511 chset->midi_mode != SNDRV_MIDI_MODE_XG) {
512 chset->midi_mode = SNDRV_MIDI_MODE_GM;
513 reset_all_channels(chset);
514 parsed = SNDRV_MIDI_SYSEX_GM_ON;
515 }
516 }
517
518 /* GS macros */
519 else if (len >= 8 &&
520 memcmp(buf, gs_pfx_macro, sizeof(gs_pfx_macro)) == 0) {
521 if (chset->midi_mode != SNDRV_MIDI_MODE_GS &&
522 chset->midi_mode != SNDRV_MIDI_MODE_XG)
523 chset->midi_mode = SNDRV_MIDI_MODE_GS;
524
525 if (buf[5] == 0x00 && buf[6] == 0x7f && buf[7] == 0x00) {
526 /* GS reset */
527 parsed = SNDRV_MIDI_SYSEX_GS_RESET;
528 reset_all_channels(chset);
529 }
530
531 else if ((buf[5] & 0xf0) == 0x10 && buf[6] == 0x15) {
532 /* drum pattern */
533 int p = get_channel(buf[5]);
534 if (p < chset->max_channels) {
535 parsed = SNDRV_MIDI_SYSEX_GS_DRUM_CHANNEL;
536 if (buf[7])
537 chset->channels[p].drum_channel = 1;
538 else
539 chset->channels[p].drum_channel = 0;
540 }
541
542 } else if ((buf[5] & 0xf0) == 0x10 && buf[6] == 0x21) {
543 /* program */
544 int p = get_channel(buf[5]);
545 if (p < chset->max_channels &&
546 ! chset->channels[p].drum_channel) {
547 parsed = SNDRV_MIDI_SYSEX_GS_DRUM_CHANNEL;
548 chset->channels[p].midi_program = buf[7];
549 }
550
551 } else if (buf[5] == 0x01 && buf[6] == 0x30) {
552 /* reverb mode */
553 parsed = SNDRV_MIDI_SYSEX_GS_REVERB_MODE;
554 chset->gs_reverb_mode = buf[7];
555
556 } else if (buf[5] == 0x01 && buf[6] == 0x38) {
557 /* chorus mode */
558 parsed = SNDRV_MIDI_SYSEX_GS_CHORUS_MODE;
559 chset->gs_chorus_mode = buf[7];
560
561 } else if (buf[5] == 0x00 && buf[6] == 0x04) {
562 /* master volume */
563 parsed = SNDRV_MIDI_SYSEX_GS_MASTER_VOLUME;
564 chset->gs_master_volume = buf[7];
565
566 }
567 }
568
569 /* XG on */
570 else if (len >= (int)sizeof(xg_on_macro) &&
571 memcmp(buf, xg_on_macro, sizeof(xg_on_macro)) == 0) {
572 int i;
573 chset->midi_mode = SNDRV_MIDI_MODE_XG;
574 parsed = SNDRV_MIDI_SYSEX_XG_ON;
575 /* reset CC#0 for drums */
576 for (i = 0; i < chset->max_channels; i++) {
577 if (chset->channels[i].drum_channel)
578 chset->channels[i].control[MIDI_CTL_MSB_BANK] = 127;
579 else
580 chset->channels[i].control[MIDI_CTL_MSB_BANK] = 0;
581 }
582 }
583
584 if (ops->sysex)
585 ops->sysex(private, buf - 1, len + 1, parsed, chset);
586}
587
588/*
589 * all sound off
590 */
591static void
592all_sounds_off(const struct snd_midi_op *ops, void *drv,
593 struct snd_midi_channel *chan)
594{
595 int n;
596
597 if (! ops->note_terminate)
598 return;
599 for (n = 0; n < 128; n++) {
600 if (chan->note[n]) {
601 ops->note_terminate(drv, n, chan);
602 chan->note[n] = 0;
603 }
604 }
605}
606
607/*
608 * all notes off
609 */
610static void
611all_notes_off(const struct snd_midi_op *ops, void *drv,
612 struct snd_midi_channel *chan)
613{
614 int n;
615
616 if (! ops->note_off)
617 return;
618 for (n = 0; n < 128; n++) {
619 if (chan->note[n] == SNDRV_MIDI_NOTE_ON)
620 note_off(ops, drv, chan, n, 0);
621 }
622}
623
624/*
625 * Initialise a single midi channel control block.
626 */
627static void snd_midi_channel_init(struct snd_midi_channel *p, int n)
628{
629 if (p == NULL)
630 return;
631
632 memset(p, 0, sizeof(struct snd_midi_channel));
633 p->private = NULL;
634 p->number = n;
635
636 snd_midi_reset_controllers(p);
637 p->gm_rpn_pitch_bend_range = 256; /* 2 semitones */
638 p->gm_rpn_fine_tuning = 0;
639 p->gm_rpn_coarse_tuning = 0;
640
641 if (n == 9)
642 p->drum_channel = 1; /* Default ch 10 as drums */
643}
644
645/*
646 * Allocate and initialise a set of midi channel control blocks.
647 */
648static struct snd_midi_channel *snd_midi_channel_init_set(int n)
649{
650 struct snd_midi_channel *chan;
651 int i;
652
653 chan = kmalloc_array(n, sizeof(struct snd_midi_channel), GFP_KERNEL);
654 if (chan) {
655 for (i = 0; i < n; i++)
656 snd_midi_channel_init(chan+i, i);
657 }
658
659 return chan;
660}
661
662/*
663 * reset all midi channels
664 */
665static void
666reset_all_channels(struct snd_midi_channel_set *chset)
667{
668 int ch;
669 for (ch = 0; ch < chset->max_channels; ch++) {
670 struct snd_midi_channel *chan = chset->channels + ch;
671 snd_midi_reset_controllers(chan);
672 chan->gm_rpn_pitch_bend_range = 256; /* 2 semitones */
673 chan->gm_rpn_fine_tuning = 0;
674 chan->gm_rpn_coarse_tuning = 0;
675
676 if (ch == 9)
677 chan->drum_channel = 1;
678 else
679 chan->drum_channel = 0;
680 }
681}
682
683
684/*
685 * Allocate and initialise a midi channel set.
686 */
687struct snd_midi_channel_set *snd_midi_channel_alloc_set(int n)
688{
689 struct snd_midi_channel_set *chset;
690
691 chset = kmalloc(sizeof(*chset), GFP_KERNEL);
692 if (chset) {
693 chset->channels = snd_midi_channel_init_set(n);
694 chset->private_data = NULL;
695 chset->max_channels = n;
696 }
697 return chset;
698}
699EXPORT_SYMBOL(snd_midi_channel_alloc_set);
700
701/*
702 * Reset the midi controllers on a particular channel to default values.
703 */
704static void snd_midi_reset_controllers(struct snd_midi_channel *chan)
705{
706 memset(chan->control, 0, sizeof(chan->control));
707 chan->gm_volume = 127;
708 chan->gm_expression = 127;
709 chan->gm_pan = 64;
710}
711
712
713/*
714 * Free a midi channel set.
715 */
716void snd_midi_channel_free_set(struct snd_midi_channel_set *chset)
717{
718 if (chset == NULL)
719 return;
720 kfree(chset->channels);
721 kfree(chset);
722}
723EXPORT_SYMBOL(snd_midi_channel_free_set);