1 /*
2 * Copyright (c) by Uros Bizjak <uros@kss-loka.si>
3 *
4 * Routines for OPL2/OPL3/OPL4 control
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
10 *
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
15 *
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
19 *
20 */
21
22 #include <linux/slab.h>
23 #include <linux/export.h>
24 #include <linux/nospec.h>
25 #include <sound/opl3.h>
26 #include <sound/asound_fm.h>
27 #include "opl3_voice.h"
28
29 #if IS_ENABLED(CONFIG_SND_SEQUENCER)
30 #define OPL3_SUPPORT_SYNTH
31 #endif
32
33 /*
34 * There is 18 possible 2 OP voices
35 * (9 in the left and 9 in the right).
36 * The first OP is the modulator and 2nd is the carrier.
37 *
38 * The first three voices in the both sides may be connected
39 * with another voice to a 4 OP voice. For example voice 0
40 * can be connected with voice 3. The operators of voice 3 are
41 * used as operators 3 and 4 of the new 4 OP voice.
42 * In this case the 2 OP voice number 0 is the 'first half' and
43 * voice 3 is the second.
44 */
45
46
47 /*
48 * Register offset table for OPL2/3 voices,
49 * OPL2 / one OPL3 register array side only
50 */
51
52 char snd_opl3_regmap[MAX_OPL2_VOICES][4] =
53 {
54 /* OP1 OP2 OP3 OP4 */
55 /* ------------------------ */
56 { 0x00, 0x03, 0x08, 0x0b },
57 { 0x01, 0x04, 0x09, 0x0c },
58 { 0x02, 0x05, 0x0a, 0x0d },
59
60 { 0x08, 0x0b, 0x00, 0x00 },
61 { 0x09, 0x0c, 0x00, 0x00 },
62 { 0x0a, 0x0d, 0x00, 0x00 },
63
64 { 0x10, 0x13, 0x00, 0x00 }, /* used by percussive voices */
65 { 0x11, 0x14, 0x00, 0x00 }, /* if the percussive mode */
66 { 0x12, 0x15, 0x00, 0x00 } /* is selected (only left reg block) */
67 };
68
69 EXPORT_SYMBOL(snd_opl3_regmap);
70
71 /*
72 * prototypes
73 */
74 static int snd_opl3_play_note(struct snd_opl3 * opl3, struct snd_dm_fm_note * note);
75 static int snd_opl3_set_voice(struct snd_opl3 * opl3, struct snd_dm_fm_voice * voice);
76 static int snd_opl3_set_params(struct snd_opl3 * opl3, struct snd_dm_fm_params * params);
77 static int snd_opl3_set_mode(struct snd_opl3 * opl3, int mode);
78 static int snd_opl3_set_connection(struct snd_opl3 * opl3, int connection);
79
80 /* ------------------------------ */
81
82 /*
83 * open the device exclusively
84 */
snd_opl3_open(struct snd_hwdep * hw,struct file * file)85 int snd_opl3_open(struct snd_hwdep * hw, struct file *file)
86 {
87 return 0;
88 }
89
90 /*
91 * ioctl for hwdep device:
92 */
snd_opl3_ioctl(struct snd_hwdep * hw,struct file * file,unsigned int cmd,unsigned long arg)93 int snd_opl3_ioctl(struct snd_hwdep * hw, struct file *file,
94 unsigned int cmd, unsigned long arg)
95 {
96 struct snd_opl3 *opl3 = hw->private_data;
97 void __user *argp = (void __user *)arg;
98
99 if (snd_BUG_ON(!opl3))
100 return -EINVAL;
101
102 switch (cmd) {
103 /* get information */
104 case SNDRV_DM_FM_IOCTL_INFO:
105 {
106 struct snd_dm_fm_info info;
107
108 info.fm_mode = opl3->fm_mode;
109 info.rhythm = opl3->rhythm;
110 if (copy_to_user(argp, &info, sizeof(struct snd_dm_fm_info)))
111 return -EFAULT;
112 return 0;
113 }
114
115 case SNDRV_DM_FM_IOCTL_RESET:
116 #ifdef CONFIG_SND_OSSEMUL
117 case SNDRV_DM_FM_OSS_IOCTL_RESET:
118 #endif
119 snd_opl3_reset(opl3);
120 return 0;
121
122 case SNDRV_DM_FM_IOCTL_PLAY_NOTE:
123 #ifdef CONFIG_SND_OSSEMUL
124 case SNDRV_DM_FM_OSS_IOCTL_PLAY_NOTE:
125 #endif
126 {
127 struct snd_dm_fm_note note;
128 if (copy_from_user(¬e, argp, sizeof(struct snd_dm_fm_note)))
129 return -EFAULT;
130 return snd_opl3_play_note(opl3, ¬e);
131 }
132
133 case SNDRV_DM_FM_IOCTL_SET_VOICE:
134 #ifdef CONFIG_SND_OSSEMUL
135 case SNDRV_DM_FM_OSS_IOCTL_SET_VOICE:
136 #endif
137 {
138 struct snd_dm_fm_voice voice;
139 if (copy_from_user(&voice, argp, sizeof(struct snd_dm_fm_voice)))
140 return -EFAULT;
141 return snd_opl3_set_voice(opl3, &voice);
142 }
143
144 case SNDRV_DM_FM_IOCTL_SET_PARAMS:
145 #ifdef CONFIG_SND_OSSEMUL
146 case SNDRV_DM_FM_OSS_IOCTL_SET_PARAMS:
147 #endif
148 {
149 struct snd_dm_fm_params params;
150 if (copy_from_user(¶ms, argp, sizeof(struct snd_dm_fm_params)))
151 return -EFAULT;
152 return snd_opl3_set_params(opl3, ¶ms);
153 }
154
155 case SNDRV_DM_FM_IOCTL_SET_MODE:
156 #ifdef CONFIG_SND_OSSEMUL
157 case SNDRV_DM_FM_OSS_IOCTL_SET_MODE:
158 #endif
159 return snd_opl3_set_mode(opl3, (int) arg);
160
161 case SNDRV_DM_FM_IOCTL_SET_CONNECTION:
162 #ifdef CONFIG_SND_OSSEMUL
163 case SNDRV_DM_FM_OSS_IOCTL_SET_OPL:
164 #endif
165 return snd_opl3_set_connection(opl3, (int) arg);
166
167 #ifdef OPL3_SUPPORT_SYNTH
168 case SNDRV_DM_FM_IOCTL_CLEAR_PATCHES:
169 snd_opl3_clear_patches(opl3);
170 return 0;
171 #endif
172
173 #ifdef CONFIG_SND_DEBUG
174 default:
175 snd_printk(KERN_WARNING "unknown IOCTL: 0x%x\n", cmd);
176 #endif
177 }
178 return -ENOTTY;
179 }
180
181 /*
182 * close the device
183 */
snd_opl3_release(struct snd_hwdep * hw,struct file * file)184 int snd_opl3_release(struct snd_hwdep * hw, struct file *file)
185 {
186 struct snd_opl3 *opl3 = hw->private_data;
187
188 snd_opl3_reset(opl3);
189 return 0;
190 }
191
192 #ifdef OPL3_SUPPORT_SYNTH
193 /*
194 * write the device - load patches
195 */
snd_opl3_write(struct snd_hwdep * hw,const char __user * buf,long count,loff_t * offset)196 long snd_opl3_write(struct snd_hwdep *hw, const char __user *buf, long count,
197 loff_t *offset)
198 {
199 struct snd_opl3 *opl3 = hw->private_data;
200 long result = 0;
201 int err = 0;
202 struct sbi_patch inst;
203
204 while (count >= sizeof(inst)) {
205 unsigned char type;
206 if (copy_from_user(&inst, buf, sizeof(inst)))
207 return -EFAULT;
208 if (!memcmp(inst.key, FM_KEY_SBI, 4) ||
209 !memcmp(inst.key, FM_KEY_2OP, 4))
210 type = FM_PATCH_OPL2;
211 else if (!memcmp(inst.key, FM_KEY_4OP, 4))
212 type = FM_PATCH_OPL3;
213 else /* invalid type */
214 break;
215 err = snd_opl3_load_patch(opl3, inst.prog, inst.bank, type,
216 inst.name, inst.extension,
217 inst.data);
218 if (err < 0)
219 break;
220 result += sizeof(inst);
221 count -= sizeof(inst);
222 }
223 return result > 0 ? result : err;
224 }
225
226
227 /*
228 * Patch management
229 */
230
231 /* offsets for SBI params */
232 #define AM_VIB 0
233 #define KSL_LEVEL 2
234 #define ATTACK_DECAY 4
235 #define SUSTAIN_RELEASE 6
236 #define WAVE_SELECT 8
237
238 /* offset for SBI instrument */
239 #define CONNECTION 10
240 #define OFFSET_4OP 11
241
242 /*
243 * load a patch, obviously.
244 *
245 * loaded on the given program and bank numbers with the given type
246 * (FM_PATCH_OPLx).
247 * data is the pointer of SBI record _without_ header (key and name).
248 * name is the name string of the patch.
249 * ext is the extension data of 7 bytes long (stored in name of SBI
250 * data up to offset 25), or NULL to skip.
251 * return 0 if successful or a negative error code.
252 */
snd_opl3_load_patch(struct snd_opl3 * opl3,int prog,int bank,int type,const char * name,const unsigned char * ext,const unsigned char * data)253 int snd_opl3_load_patch(struct snd_opl3 *opl3,
254 int prog, int bank, int type,
255 const char *name,
256 const unsigned char *ext,
257 const unsigned char *data)
258 {
259 struct fm_patch *patch;
260 int i;
261
262 patch = snd_opl3_find_patch(opl3, prog, bank, 1);
263 if (!patch)
264 return -ENOMEM;
265
266 patch->type = type;
267
268 for (i = 0; i < 2; i++) {
269 patch->inst.op[i].am_vib = data[AM_VIB + i];
270 patch->inst.op[i].ksl_level = data[KSL_LEVEL + i];
271 patch->inst.op[i].attack_decay = data[ATTACK_DECAY + i];
272 patch->inst.op[i].sustain_release = data[SUSTAIN_RELEASE + i];
273 patch->inst.op[i].wave_select = data[WAVE_SELECT + i];
274 }
275 patch->inst.feedback_connection[0] = data[CONNECTION];
276
277 if (type == FM_PATCH_OPL3) {
278 for (i = 0; i < 2; i++) {
279 patch->inst.op[i+2].am_vib =
280 data[OFFSET_4OP + AM_VIB + i];
281 patch->inst.op[i+2].ksl_level =
282 data[OFFSET_4OP + KSL_LEVEL + i];
283 patch->inst.op[i+2].attack_decay =
284 data[OFFSET_4OP + ATTACK_DECAY + i];
285 patch->inst.op[i+2].sustain_release =
286 data[OFFSET_4OP + SUSTAIN_RELEASE + i];
287 patch->inst.op[i+2].wave_select =
288 data[OFFSET_4OP + WAVE_SELECT + i];
289 }
290 patch->inst.feedback_connection[1] =
291 data[OFFSET_4OP + CONNECTION];
292 }
293
294 if (ext) {
295 patch->inst.echo_delay = ext[0];
296 patch->inst.echo_atten = ext[1];
297 patch->inst.chorus_spread = ext[2];
298 patch->inst.trnsps = ext[3];
299 patch->inst.fix_dur = ext[4];
300 patch->inst.modes = ext[5];
301 patch->inst.fix_key = ext[6];
302 }
303
304 if (name)
305 strlcpy(patch->name, name, sizeof(patch->name));
306
307 return 0;
308 }
309 EXPORT_SYMBOL(snd_opl3_load_patch);
310
311 /*
312 * find a patch with the given program and bank numbers, returns its pointer
313 * if no matching patch is found and create_patch is set, it creates a
314 * new patch object.
315 */
snd_opl3_find_patch(struct snd_opl3 * opl3,int prog,int bank,int create_patch)316 struct fm_patch *snd_opl3_find_patch(struct snd_opl3 *opl3, int prog, int bank,
317 int create_patch)
318 {
319 /* pretty dumb hash key */
320 unsigned int key = (prog + bank) % OPL3_PATCH_HASH_SIZE;
321 struct fm_patch *patch;
322
323 for (patch = opl3->patch_table[key]; patch; patch = patch->next) {
324 if (patch->prog == prog && patch->bank == bank)
325 return patch;
326 }
327 if (!create_patch)
328 return NULL;
329
330 patch = kzalloc(sizeof(*patch), GFP_KERNEL);
331 if (!patch)
332 return NULL;
333 patch->prog = prog;
334 patch->bank = bank;
335 patch->next = opl3->patch_table[key];
336 opl3->patch_table[key] = patch;
337 return patch;
338 }
339 EXPORT_SYMBOL(snd_opl3_find_patch);
340
341 /*
342 * Clear all patches of the given OPL3 instance
343 */
snd_opl3_clear_patches(struct snd_opl3 * opl3)344 void snd_opl3_clear_patches(struct snd_opl3 *opl3)
345 {
346 int i;
347 for (i = 0; i < OPL3_PATCH_HASH_SIZE; i++) {
348 struct fm_patch *patch, *next;
349 for (patch = opl3->patch_table[i]; patch; patch = next) {
350 next = patch->next;
351 kfree(patch);
352 }
353 }
354 memset(opl3->patch_table, 0, sizeof(opl3->patch_table));
355 }
356 #endif /* OPL3_SUPPORT_SYNTH */
357
358 /* ------------------------------ */
359
snd_opl3_reset(struct snd_opl3 * opl3)360 void snd_opl3_reset(struct snd_opl3 * opl3)
361 {
362 unsigned short opl3_reg;
363
364 unsigned short reg_side;
365 unsigned char voice_offset;
366
367 int max_voices, i;
368
369 max_voices = (opl3->hardware < OPL3_HW_OPL3) ?
370 MAX_OPL2_VOICES : MAX_OPL3_VOICES;
371
372 for (i = 0; i < max_voices; i++) {
373 /* Get register array side and offset of voice */
374 if (i < MAX_OPL2_VOICES) {
375 /* Left register block for voices 0 .. 8 */
376 reg_side = OPL3_LEFT;
377 voice_offset = i;
378 } else {
379 /* Right register block for voices 9 .. 17 */
380 reg_side = OPL3_RIGHT;
381 voice_offset = i - MAX_OPL2_VOICES;
382 }
383 opl3_reg = reg_side | (OPL3_REG_KSL_LEVEL + snd_opl3_regmap[voice_offset][0]);
384 opl3->command(opl3, opl3_reg, OPL3_TOTAL_LEVEL_MASK); /* Operator 1 volume */
385 opl3_reg = reg_side | (OPL3_REG_KSL_LEVEL + snd_opl3_regmap[voice_offset][1]);
386 opl3->command(opl3, opl3_reg, OPL3_TOTAL_LEVEL_MASK); /* Operator 2 volume */
387
388 opl3_reg = reg_side | (OPL3_REG_KEYON_BLOCK + voice_offset);
389 opl3->command(opl3, opl3_reg, 0x00); /* Note off */
390 }
391
392 opl3->max_voices = MAX_OPL2_VOICES;
393 opl3->fm_mode = SNDRV_DM_FM_MODE_OPL2;
394
395 opl3->command(opl3, OPL3_LEFT | OPL3_REG_TEST, OPL3_ENABLE_WAVE_SELECT);
396 opl3->command(opl3, OPL3_LEFT | OPL3_REG_PERCUSSION, 0x00); /* Melodic mode */
397 opl3->rhythm = 0;
398 }
399
400 EXPORT_SYMBOL(snd_opl3_reset);
401
snd_opl3_play_note(struct snd_opl3 * opl3,struct snd_dm_fm_note * note)402 static int snd_opl3_play_note(struct snd_opl3 * opl3, struct snd_dm_fm_note * note)
403 {
404 unsigned short reg_side;
405 unsigned char voice_offset;
406
407 unsigned short opl3_reg;
408 unsigned char reg_val;
409
410 /* Voices 0 - 8 in OPL2 mode */
411 /* Voices 0 - 17 in OPL3 mode */
412 if (note->voice >= ((opl3->fm_mode == SNDRV_DM_FM_MODE_OPL3) ?
413 MAX_OPL3_VOICES : MAX_OPL2_VOICES))
414 return -EINVAL;
415
416 /* Get register array side and offset of voice */
417 if (note->voice < MAX_OPL2_VOICES) {
418 /* Left register block for voices 0 .. 8 */
419 reg_side = OPL3_LEFT;
420 voice_offset = note->voice;
421 } else {
422 /* Right register block for voices 9 .. 17 */
423 reg_side = OPL3_RIGHT;
424 voice_offset = note->voice - MAX_OPL2_VOICES;
425 }
426
427 /* Set lower 8 bits of note frequency */
428 reg_val = (unsigned char) note->fnum;
429 opl3_reg = reg_side | (OPL3_REG_FNUM_LOW + voice_offset);
430 opl3->command(opl3, opl3_reg, reg_val);
431
432 reg_val = 0x00;
433 /* Set output sound flag */
434 if (note->key_on)
435 reg_val |= OPL3_KEYON_BIT;
436 /* Set octave */
437 reg_val |= (note->octave << 2) & OPL3_BLOCKNUM_MASK;
438 /* Set higher 2 bits of note frequency */
439 reg_val |= (unsigned char) (note->fnum >> 8) & OPL3_FNUM_HIGH_MASK;
440
441 /* Set OPL3 KEYON_BLOCK register of requested voice */
442 opl3_reg = reg_side | (OPL3_REG_KEYON_BLOCK + voice_offset);
443 opl3->command(opl3, opl3_reg, reg_val);
444
445 return 0;
446 }
447
448
snd_opl3_set_voice(struct snd_opl3 * opl3,struct snd_dm_fm_voice * voice)449 static int snd_opl3_set_voice(struct snd_opl3 * opl3, struct snd_dm_fm_voice * voice)
450 {
451 unsigned short reg_side;
452 unsigned char op_offset;
453 unsigned char voice_offset, voice_op;
454
455 unsigned short opl3_reg;
456 unsigned char reg_val;
457
458 /* Only operators 1 and 2 */
459 if (voice->op > 1)
460 return -EINVAL;
461 /* Voices 0 - 8 in OPL2 mode */
462 /* Voices 0 - 17 in OPL3 mode */
463 if (voice->voice >= ((opl3->fm_mode == SNDRV_DM_FM_MODE_OPL3) ?
464 MAX_OPL3_VOICES : MAX_OPL2_VOICES))
465 return -EINVAL;
466
467 /* Get register array side and offset of voice */
468 if (voice->voice < MAX_OPL2_VOICES) {
469 /* Left register block for voices 0 .. 8 */
470 reg_side = OPL3_LEFT;
471 voice_offset = voice->voice;
472 } else {
473 /* Right register block for voices 9 .. 17 */
474 reg_side = OPL3_RIGHT;
475 voice_offset = voice->voice - MAX_OPL2_VOICES;
476 }
477 /* Get register offset of operator */
478 voice_offset = array_index_nospec(voice_offset, MAX_OPL2_VOICES);
479 voice_op = array_index_nospec(voice->op, 4);
480 op_offset = snd_opl3_regmap[voice_offset][voice_op];
481
482 reg_val = 0x00;
483 /* Set amplitude modulation (tremolo) effect */
484 if (voice->am)
485 reg_val |= OPL3_TREMOLO_ON;
486 /* Set vibrato effect */
487 if (voice->vibrato)
488 reg_val |= OPL3_VIBRATO_ON;
489 /* Set sustaining sound phase */
490 if (voice->do_sustain)
491 reg_val |= OPL3_SUSTAIN_ON;
492 /* Set keyboard scaling bit */
493 if (voice->kbd_scale)
494 reg_val |= OPL3_KSR;
495 /* Set harmonic or frequency multiplier */
496 reg_val |= voice->harmonic & OPL3_MULTIPLE_MASK;
497
498 /* Set OPL3 AM_VIB register of requested voice/operator */
499 opl3_reg = reg_side | (OPL3_REG_AM_VIB + op_offset);
500 opl3->command(opl3, opl3_reg, reg_val);
501
502 /* Set decreasing volume of higher notes */
503 reg_val = (voice->scale_level << 6) & OPL3_KSL_MASK;
504 /* Set output volume */
505 reg_val |= ~voice->volume & OPL3_TOTAL_LEVEL_MASK;
506
507 /* Set OPL3 KSL_LEVEL register of requested voice/operator */
508 opl3_reg = reg_side | (OPL3_REG_KSL_LEVEL + op_offset);
509 opl3->command(opl3, opl3_reg, reg_val);
510
511 /* Set attack phase level */
512 reg_val = (voice->attack << 4) & OPL3_ATTACK_MASK;
513 /* Set decay phase level */
514 reg_val |= voice->decay & OPL3_DECAY_MASK;
515
516 /* Set OPL3 ATTACK_DECAY register of requested voice/operator */
517 opl3_reg = reg_side | (OPL3_REG_ATTACK_DECAY + op_offset);
518 opl3->command(opl3, opl3_reg, reg_val);
519
520 /* Set sustain phase level */
521 reg_val = (voice->sustain << 4) & OPL3_SUSTAIN_MASK;
522 /* Set release phase level */
523 reg_val |= voice->release & OPL3_RELEASE_MASK;
524
525 /* Set OPL3 SUSTAIN_RELEASE register of requested voice/operator */
526 opl3_reg = reg_side | (OPL3_REG_SUSTAIN_RELEASE + op_offset);
527 opl3->command(opl3, opl3_reg, reg_val);
528
529 /* Set inter-operator feedback */
530 reg_val = (voice->feedback << 1) & OPL3_FEEDBACK_MASK;
531 /* Set inter-operator connection */
532 if (voice->connection)
533 reg_val |= OPL3_CONNECTION_BIT;
534 /* OPL-3 only */
535 if (opl3->fm_mode == SNDRV_DM_FM_MODE_OPL3) {
536 if (voice->left)
537 reg_val |= OPL3_VOICE_TO_LEFT;
538 if (voice->right)
539 reg_val |= OPL3_VOICE_TO_RIGHT;
540 }
541 /* Feedback/connection bits are applicable to voice */
542 opl3_reg = reg_side | (OPL3_REG_FEEDBACK_CONNECTION + voice_offset);
543 opl3->command(opl3, opl3_reg, reg_val);
544
545 /* Select waveform */
546 reg_val = voice->waveform & OPL3_WAVE_SELECT_MASK;
547 opl3_reg = reg_side | (OPL3_REG_WAVE_SELECT + op_offset);
548 opl3->command(opl3, opl3_reg, reg_val);
549
550 return 0;
551 }
552
snd_opl3_set_params(struct snd_opl3 * opl3,struct snd_dm_fm_params * params)553 static int snd_opl3_set_params(struct snd_opl3 * opl3, struct snd_dm_fm_params * params)
554 {
555 unsigned char reg_val;
556
557 reg_val = 0x00;
558 /* Set keyboard split method */
559 if (params->kbd_split)
560 reg_val |= OPL3_KEYBOARD_SPLIT;
561 opl3->command(opl3, OPL3_LEFT | OPL3_REG_KBD_SPLIT, reg_val);
562
563 reg_val = 0x00;
564 /* Set amplitude modulation (tremolo) depth */
565 if (params->am_depth)
566 reg_val |= OPL3_TREMOLO_DEPTH;
567 /* Set vibrato depth */
568 if (params->vib_depth)
569 reg_val |= OPL3_VIBRATO_DEPTH;
570 /* Set percussion mode */
571 if (params->rhythm) {
572 reg_val |= OPL3_PERCUSSION_ENABLE;
573 opl3->rhythm = 1;
574 } else {
575 opl3->rhythm = 0;
576 }
577 /* Play percussion instruments */
578 if (params->bass)
579 reg_val |= OPL3_BASSDRUM_ON;
580 if (params->snare)
581 reg_val |= OPL3_SNAREDRUM_ON;
582 if (params->tomtom)
583 reg_val |= OPL3_TOMTOM_ON;
584 if (params->cymbal)
585 reg_val |= OPL3_CYMBAL_ON;
586 if (params->hihat)
587 reg_val |= OPL3_HIHAT_ON;
588
589 opl3->command(opl3, OPL3_LEFT | OPL3_REG_PERCUSSION, reg_val);
590 return 0;
591 }
592
snd_opl3_set_mode(struct snd_opl3 * opl3,int mode)593 static int snd_opl3_set_mode(struct snd_opl3 * opl3, int mode)
594 {
595 if ((mode == SNDRV_DM_FM_MODE_OPL3) && (opl3->hardware < OPL3_HW_OPL3))
596 return -EINVAL;
597
598 opl3->fm_mode = mode;
599 if (opl3->hardware >= OPL3_HW_OPL3)
600 opl3->command(opl3, OPL3_RIGHT | OPL3_REG_CONNECTION_SELECT, 0x00); /* Clear 4-op connections */
601
602 return 0;
603 }
604
snd_opl3_set_connection(struct snd_opl3 * opl3,int connection)605 static int snd_opl3_set_connection(struct snd_opl3 * opl3, int connection)
606 {
607 unsigned char reg_val;
608
609 /* OPL-3 only */
610 if (opl3->fm_mode != SNDRV_DM_FM_MODE_OPL3)
611 return -EINVAL;
612
613 reg_val = connection & (OPL3_RIGHT_4OP_0 | OPL3_RIGHT_4OP_1 | OPL3_RIGHT_4OP_2 |
614 OPL3_LEFT_4OP_0 | OPL3_LEFT_4OP_1 | OPL3_LEFT_4OP_2);
615 /* Set 4-op connections */
616 opl3->command(opl3, OPL3_RIGHT | OPL3_REG_CONNECTION_SELECT, reg_val);
617
618 return 0;
619 }
620
621
