sound/drivers/opl3/opl3_synth.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  *  Copyright (c) by Uros Bizjak <uros@kss-loka.si>
   4  *
   5  *  Routines for OPL2/OPL3/OPL4 control
   6  */
   7
   8 #include <linux/slab.h>
   9 #include <linux/export.h>
  10 #include <linux/nospec.h>
  11 #include <sound/opl3.h>
  12 #include <sound/asound_fm.h>
  13 #include "opl3_voice.h"
  14
  15 #if IS_ENABLED(CONFIG_SND_SEQUENCER)
  16 #define OPL3_SUPPORT_SYNTH
  17 #endif
  18
  19 /*
  20  *    There is 18 possible 2 OP voices
  21  *      (9 in the left and 9 in the right).
  22  *      The first OP is the modulator and 2nd is the carrier.
  23  *
  24  *      The first three voices in the both sides may be connected
  25  *      with another voice to a 4 OP voice. For example voice 0
  26  *      can be connected with voice 3. The operators of voice 3 are
  27  *      used as operators 3 and 4 of the new 4 OP voice.
  28  *      In this case the 2 OP voice number 0 is the 'first half' and
  29  *      voice 3 is the second.
  30  */
  31
  32
  33 /*
  34  *    Register offset table for OPL2/3 voices,
  35  *    OPL2 / one OPL3 register array side only
  36  */
  37
  38 char snd_opl3_regmap[MAX_OPL2_VOICES][4] =
  39 {
  40 /*        OP1   OP2   OP3   OP4         */
  41 /*       ------------------------       */
  42         { 0x00, 0x03, 0x08, 0x0b },
  43         { 0x01, 0x04, 0x09, 0x0c },
  44         { 0x02, 0x05, 0x0a, 0x0d },
  45
  46         { 0x08, 0x0b, 0x00, 0x00 },
  47         { 0x09, 0x0c, 0x00, 0x00 },
  48         { 0x0a, 0x0d, 0x00, 0x00 },
  49
  50         { 0x10, 0x13, 0x00, 0x00 },     /* used by percussive voices */
  51         { 0x11, 0x14, 0x00, 0x00 },     /* if the percussive mode */
  52         { 0x12, 0x15, 0x00, 0x00 }      /* is selected (only left reg block) */
  53 };
  54
  55 EXPORT_SYMBOL(snd_opl3_regmap);
  56
  57 /*
  58  * prototypes
  59  */
  60 static int snd_opl3_play_note(struct snd_opl3 * opl3, struct snd_dm_fm_note * note);
  61 static int snd_opl3_set_voice(struct snd_opl3 * opl3, struct snd_dm_fm_voice * voice);
  62 static int snd_opl3_set_params(struct snd_opl3 * opl3, struct snd_dm_fm_params * params);
  63 static int snd_opl3_set_mode(struct snd_opl3 * opl3, int mode);
  64 static int snd_opl3_set_connection(struct snd_opl3 * opl3, int connection);
  65
  66 /* ------------------------------ */
  67
  68 /*
  69  * open the device exclusively
  70  */
  71 int snd_opl3_open(struct snd_hwdep * hw, struct file *file)
  72 {
  73         return 0;
  74 }
  75
  76 /*
  77  * ioctl for hwdep device:
  78  */
  79 int snd_opl3_ioctl(struct snd_hwdep * hw, struct file *file,
  80                    unsigned int cmd, unsigned long arg)
  81 {
  82         struct snd_opl3 *opl3 = hw->private_data;
  83         void __user *argp = (void __user *)arg;
  84
  85         if (snd_BUG_ON(!opl3))
  86                 return -EINVAL;
  87
  88         switch (cmd) {
  89                 /* get information */
  90         case SNDRV_DM_FM_IOCTL_INFO:
  91                 {
  92                         struct snd_dm_fm_info info;
  93
  94                         info.fm_mode = opl3->fm_mode;
  95                         info.rhythm = opl3->rhythm;
  96                         if (copy_to_user(argp, &info, sizeof(struct snd_dm_fm_info)))
  97                                 return -EFAULT;
  98                         return 0;
  99                 }
 100
 101         case SNDRV_DM_FM_IOCTL_RESET:
 102 #ifdef CONFIG_SND_OSSEMUL
 103         case SNDRV_DM_FM_OSS_IOCTL_RESET:
 104 #endif
 105                 snd_opl3_reset(opl3);
 106                 return 0;
 107
 108         case SNDRV_DM_FM_IOCTL_PLAY_NOTE:
 109 #ifdef CONFIG_SND_OSSEMUL
 110         case SNDRV_DM_FM_OSS_IOCTL_PLAY_NOTE:
 111 #endif
 112                 {
 113                         struct snd_dm_fm_note note;
 114                         if (copy_from_user(&note, argp, sizeof(struct snd_dm_fm_note)))
 115                                 return -EFAULT;
 116                         return snd_opl3_play_note(opl3, &note);
 117                 }
 118
 119         case SNDRV_DM_FM_IOCTL_SET_VOICE:
 120 #ifdef CONFIG_SND_OSSEMUL
 121         case SNDRV_DM_FM_OSS_IOCTL_SET_VOICE:
 122 #endif
 123                 {
 124                         struct snd_dm_fm_voice voice;
 125                         if (copy_from_user(&voice, argp, sizeof(struct snd_dm_fm_voice)))
 126                                 return -EFAULT;
 127                         return snd_opl3_set_voice(opl3, &voice);
 128                 }
 129
 130         case SNDRV_DM_FM_IOCTL_SET_PARAMS:
 131 #ifdef CONFIG_SND_OSSEMUL
 132         case SNDRV_DM_FM_OSS_IOCTL_SET_PARAMS:
 133 #endif
 134                 {
 135                         struct snd_dm_fm_params params;
 136                         if (copy_from_user(&params, argp, sizeof(struct snd_dm_fm_params)))
 137                                 return -EFAULT;
 138                         return snd_opl3_set_params(opl3, &params);
 139                 }
 140
 141         case SNDRV_DM_FM_IOCTL_SET_MODE:
 142 #ifdef CONFIG_SND_OSSEMUL
 143         case SNDRV_DM_FM_OSS_IOCTL_SET_MODE:
 144 #endif
 145                 return snd_opl3_set_mode(opl3, (int) arg);
 146
 147         case SNDRV_DM_FM_IOCTL_SET_CONNECTION:
 148 #ifdef CONFIG_SND_OSSEMUL
 149         case SNDRV_DM_FM_OSS_IOCTL_SET_OPL:
 150 #endif
 151                 return snd_opl3_set_connection(opl3, (int) arg);
 152
 153 #ifdef OPL3_SUPPORT_SYNTH
 154         case SNDRV_DM_FM_IOCTL_CLEAR_PATCHES:
 155                 snd_opl3_clear_patches(opl3);
 156                 return 0;
 157 #endif
 158
 159 #ifdef CONFIG_SND_DEBUG
 160         default:
 161                 snd_printk(KERN_WARNING "unknown IOCTL: 0x%x\n", cmd);
 162 #endif
 163         }
 164         return -ENOTTY;
 165 }
 166
 167 /*
 168  * close the device
 169  */
 170 int snd_opl3_release(struct snd_hwdep * hw, struct file *file)
 171 {
 172         struct snd_opl3 *opl3 = hw->private_data;
 173
 174         snd_opl3_reset(opl3);
 175         return 0;
 176 }
 177
 178 #ifdef OPL3_SUPPORT_SYNTH
 179 /*
 180  * write the device - load patches
 181  */
 182 long snd_opl3_write(struct snd_hwdep *hw, const char __user *buf, long count,
 183                     loff_t *offset)
 184 {
 185         struct snd_opl3 *opl3 = hw->private_data;
 186         long result = 0;
 187         int err = 0;
 188         struct sbi_patch inst;
 189
 190         while (count >= sizeof(inst)) {
 191                 unsigned char type;
 192                 if (copy_from_user(&inst, buf, sizeof(inst)))
 193                         return -EFAULT;
 194                 if (!memcmp(inst.key, FM_KEY_SBI, 4) ||
 195                     !memcmp(inst.key, FM_KEY_2OP, 4))
 196                         type = FM_PATCH_OPL2;
 197                 else if (!memcmp(inst.key, FM_KEY_4OP, 4))
 198                         type = FM_PATCH_OPL3;
 199                 else /* invalid type */
 200                         break;
 201                 err = snd_opl3_load_patch(opl3, inst.prog, inst.bank, type,
 202                                           inst.name, inst.extension,
 203                                           inst.data);
 204                 if (err < 0)
 205                         break;
 206                 result += sizeof(inst);
 207                 count -= sizeof(inst);
 208         }
 209         return result > 0 ? result : err;
 210 }
 211
 212
 213 /*
 214  * Patch management
 215  */
 216
 217 /* offsets for SBI params */
 218 #define AM_VIB          0
 219 #define KSL_LEVEL       2
 220 #define ATTACK_DECAY    4
 221 #define SUSTAIN_RELEASE 6
 222 #define WAVE_SELECT     8
 223
 224 /* offset for SBI instrument */
 225 #define CONNECTION      10
 226 #define OFFSET_4OP      11
 227
 228 /*
 229  * load a patch, obviously.
 230  *
 231  * loaded on the given program and bank numbers with the given type
 232  * (FM_PATCH_OPLx).
 233  * data is the pointer of SBI record _without_ header (key and name).
 234  * name is the name string of the patch.
 235  * ext is the extension data of 7 bytes long (stored in name of SBI
 236  * data up to offset 25), or NULL to skip.
 237  * return 0 if successful or a negative error code.
 238  */
 239 int snd_opl3_load_patch(struct snd_opl3 *opl3,
 240                         int prog, int bank, int type,
 241                         const char *name,
 242                         const unsigned char *ext,
 243                         const unsigned char *data)
 244 {
 245         struct fm_patch *patch;
 246         int i;
 247
 248         patch = snd_opl3_find_patch(opl3, prog, bank, 1);
 249         if (!patch)
 250                 return -ENOMEM;
 251
 252         patch->type = type;
 253
 254         for (i = 0; i < 2; i++) {
 255                 patch->inst.op[i].am_vib = data[AM_VIB + i];
 256                 patch->inst.op[i].ksl_level = data[KSL_LEVEL + i];
 257                 patch->inst.op[i].attack_decay = data[ATTACK_DECAY + i];
 258                 patch->inst.op[i].sustain_release = data[SUSTAIN_RELEASE + i];
 259                 patch->inst.op[i].wave_select = data[WAVE_SELECT + i];
 260         }
 261         patch->inst.feedback_connection[0] = data[CONNECTION];
 262
 263         if (type == FM_PATCH_OPL3) {
 264                 for (i = 0; i < 2; i++) {
 265                         patch->inst.op[i+2].am_vib =
 266                                 data[OFFSET_4OP + AM_VIB + i];
 267                         patch->inst.op[i+2].ksl_level =
 268                                 data[OFFSET_4OP + KSL_LEVEL + i];
 269                         patch->inst.op[i+2].attack_decay =
 270                                 data[OFFSET_4OP + ATTACK_DECAY + i];
 271                         patch->inst.op[i+2].sustain_release =
 272                                 data[OFFSET_4OP + SUSTAIN_RELEASE + i];
 273                         patch->inst.op[i+2].wave_select =
 274                                 data[OFFSET_4OP + WAVE_SELECT + i];
 275                 }
 276                 patch->inst.feedback_connection[1] =
 277                         data[OFFSET_4OP + CONNECTION];
 278         }
 279
 280         if (ext) {
 281                 patch->inst.echo_delay = ext[0];
 282                 patch->inst.echo_atten = ext[1];
 283                 patch->inst.chorus_spread = ext[2];
 284                 patch->inst.trnsps = ext[3];
 285                 patch->inst.fix_dur = ext[4];
 286                 patch->inst.modes = ext[5];
 287                 patch->inst.fix_key = ext[6];
 288         }
 289
 290         if (name)
 291                 strlcpy(patch->name, name, sizeof(patch->name));
 292
 293         return 0;
 294 }
 295 EXPORT_SYMBOL(snd_opl3_load_patch);
 296
 297 /*
 298  * find a patch with the given program and bank numbers, returns its pointer
 299  * if no matching patch is found and create_patch is set, it creates a
 300  * new patch object.
 301  */
 302 struct fm_patch *snd_opl3_find_patch(struct snd_opl3 *opl3, int prog, int bank,
 303                                      int create_patch)
 304 {
 305         /* pretty dumb hash key */
 306         unsigned int key = (prog + bank) % OPL3_PATCH_HASH_SIZE;
 307         struct fm_patch *patch;
 308
 309         for (patch = opl3->patch_table[key]; patch; patch = patch->next) {
 310                 if (patch->prog == prog && patch->bank == bank)
 311                         return patch;
 312         }
 313         if (!create_patch)
 314                 return NULL;
 315
 316         patch = kzalloc(sizeof(*patch), GFP_KERNEL);
 317         if (!patch)
 318                 return NULL;
 319         patch->prog = prog;
 320         patch->bank = bank;
 321         patch->next = opl3->patch_table[key];
 322         opl3->patch_table[key] = patch;
 323         return patch;
 324 }
 325 EXPORT_SYMBOL(snd_opl3_find_patch);
 326
 327 /*
 328  * Clear all patches of the given OPL3 instance
 329  */
 330 void snd_opl3_clear_patches(struct snd_opl3 *opl3)
 331 {
 332         int i;
 333         for (i = 0; i <  OPL3_PATCH_HASH_SIZE; i++) {
 334                 struct fm_patch *patch, *next;
 335                 for (patch = opl3->patch_table[i]; patch; patch = next) {
 336                         next = patch->next;
 337                         kfree(patch);
 338                 }
 339         }
 340         memset(opl3->patch_table, 0, sizeof(opl3->patch_table));
 341 }
 342 #endif /* OPL3_SUPPORT_SYNTH */
 343
 344 /* ------------------------------ */
 345
 346 void snd_opl3_reset(struct snd_opl3 * opl3)
 347 {
 348         unsigned short opl3_reg;
 349
 350         unsigned short reg_side;
 351         unsigned char voice_offset;
 352
 353         int max_voices, i;
 354
 355         max_voices = (opl3->hardware < OPL3_HW_OPL3) ?
 356                 MAX_OPL2_VOICES : MAX_OPL3_VOICES;
 357
 358         for (i = 0; i < max_voices; i++) {
 359                 /* Get register array side and offset of voice */
 360                 if (i < MAX_OPL2_VOICES) {
 361                         /* Left register block for voices 0 .. 8 */
 362                         reg_side = OPL3_LEFT;
 363                         voice_offset = i;
 364                 } else {
 365                         /* Right register block for voices 9 .. 17 */
 366                         reg_side = OPL3_RIGHT;
 367                         voice_offset = i - MAX_OPL2_VOICES;
 368                 }
 369                 opl3_reg = reg_side | (OPL3_REG_KSL_LEVEL + snd_opl3_regmap[voice_offset][0]);
 370                 opl3->command(opl3, opl3_reg, OPL3_TOTAL_LEVEL_MASK); /* Operator 1 volume */
 371                 opl3_reg = reg_side | (OPL3_REG_KSL_LEVEL + snd_opl3_regmap[voice_offset][1]);
 372                 opl3->command(opl3, opl3_reg, OPL3_TOTAL_LEVEL_MASK); /* Operator 2 volume */
 373
 374                 opl3_reg = reg_side | (OPL3_REG_KEYON_BLOCK + voice_offset);
 375                 opl3->command(opl3, opl3_reg, 0x00);    /* Note off */
 376         }
 377
 378         opl3->max_voices = MAX_OPL2_VOICES;
 379         opl3->fm_mode = SNDRV_DM_FM_MODE_OPL2;
 380
 381         opl3->command(opl3, OPL3_LEFT | OPL3_REG_TEST, OPL3_ENABLE_WAVE_SELECT);
 382         opl3->command(opl3, OPL3_LEFT | OPL3_REG_PERCUSSION, 0x00);     /* Melodic mode */
 383         opl3->rhythm = 0;
 384 }
 385
 386 EXPORT_SYMBOL(snd_opl3_reset);
 387
 388 static int snd_opl3_play_note(struct snd_opl3 * opl3, struct snd_dm_fm_note * note)
 389 {
 390         unsigned short reg_side;
 391         unsigned char voice_offset;
 392
 393         unsigned short opl3_reg;
 394         unsigned char reg_val;
 395
 396         /* Voices 0 -  8 in OPL2 mode */
 397         /* Voices 0 - 17 in OPL3 mode */
 398         if (note->voice >= ((opl3->fm_mode == SNDRV_DM_FM_MODE_OPL3) ?
 399                             MAX_OPL3_VOICES : MAX_OPL2_VOICES))
 400                 return -EINVAL;
 401
 402         /* Get register array side and offset of voice */
 403         if (note->voice < MAX_OPL2_VOICES) {
 404                 /* Left register block for voices 0 .. 8 */
 405                 reg_side = OPL3_LEFT;
 406                 voice_offset = note->voice;
 407         } else {
 408                 /* Right register block for voices 9 .. 17 */
 409                 reg_side = OPL3_RIGHT;
 410                 voice_offset = note->voice - MAX_OPL2_VOICES;
 411         }
 412
 413         /* Set lower 8 bits of note frequency */
 414         reg_val = (unsigned char) note->fnum;
 415         opl3_reg = reg_side | (OPL3_REG_FNUM_LOW + voice_offset);
 416         opl3->command(opl3, opl3_reg, reg_val);
 417
 418         reg_val = 0x00;
 419         /* Set output sound flag */
 420         if (note->key_on)
 421                 reg_val |= OPL3_KEYON_BIT;
 422         /* Set octave */
 423         reg_val |= (note->octave << 2) & OPL3_BLOCKNUM_MASK;
 424         /* Set higher 2 bits of note frequency */
 425         reg_val |= (unsigned char) (note->fnum >> 8) & OPL3_FNUM_HIGH_MASK;
 426
 427         /* Set OPL3 KEYON_BLOCK register of requested voice */
 428         opl3_reg = reg_side | (OPL3_REG_KEYON_BLOCK + voice_offset);
 429         opl3->command(opl3, opl3_reg, reg_val);
 430
 431         return 0;
 432 }
 433
 434
 435 static int snd_opl3_set_voice(struct snd_opl3 * opl3, struct snd_dm_fm_voice * voice)
 436 {
 437         unsigned short reg_side;
 438         unsigned char op_offset;
 439         unsigned char voice_offset, voice_op;
 440
 441         unsigned short opl3_reg;
 442         unsigned char reg_val;
 443
 444         /* Only operators 1 and 2 */
 445         if (voice->op > 1)
 446                 return -EINVAL;
 447         /* Voices 0 -  8 in OPL2 mode */
 448         /* Voices 0 - 17 in OPL3 mode */
 449         if (voice->voice >= ((opl3->fm_mode == SNDRV_DM_FM_MODE_OPL3) ?
 450                              MAX_OPL3_VOICES : MAX_OPL2_VOICES))
 451                 return -EINVAL;
 452
 453         /* Get register array side and offset of voice */
 454         if (voice->voice < MAX_OPL2_VOICES) {
 455                 /* Left register block for voices 0 .. 8 */
 456                 reg_side = OPL3_LEFT;
 457                 voice_offset = voice->voice;
 458         } else {
 459                 /* Right register block for voices 9 .. 17 */
 460                 reg_side = OPL3_RIGHT;
 461                 voice_offset = voice->voice - MAX_OPL2_VOICES;
 462         }
 463         /* Get register offset of operator */
 464         voice_offset = array_index_nospec(voice_offset, MAX_OPL2_VOICES);
 465         voice_op = array_index_nospec(voice->op, 4);
 466         op_offset = snd_opl3_regmap[voice_offset][voice_op];
 467
 468         reg_val = 0x00;
 469         /* Set amplitude modulation (tremolo) effect */
 470         if (voice->am)
 471                 reg_val |= OPL3_TREMOLO_ON;
 472         /* Set vibrato effect */
 473         if (voice->vibrato)
 474                 reg_val |= OPL3_VIBRATO_ON;
 475         /* Set sustaining sound phase */
 476         if (voice->do_sustain)
 477                 reg_val |= OPL3_SUSTAIN_ON;
 478         /* Set keyboard scaling bit */
 479         if (voice->kbd_scale)
 480                 reg_val |= OPL3_KSR;
 481         /* Set harmonic or frequency multiplier */
 482         reg_val |= voice->harmonic & OPL3_MULTIPLE_MASK;
 483
 484         /* Set OPL3 AM_VIB register of requested voice/operator */
 485         opl3_reg = reg_side | (OPL3_REG_AM_VIB + op_offset);
 486         opl3->command(opl3, opl3_reg, reg_val);
 487
 488         /* Set decreasing volume of higher notes */
 489         reg_val = (voice->scale_level << 6) & OPL3_KSL_MASK;
 490         /* Set output volume */
 491         reg_val |= ~voice->volume & OPL3_TOTAL_LEVEL_MASK;
 492
 493         /* Set OPL3 KSL_LEVEL register of requested voice/operator */
 494         opl3_reg = reg_side | (OPL3_REG_KSL_LEVEL + op_offset);
 495         opl3->command(opl3, opl3_reg, reg_val);
 496
 497         /* Set attack phase level */
 498         reg_val = (voice->attack << 4) & OPL3_ATTACK_MASK;
 499         /* Set decay phase level */
 500         reg_val |= voice->decay & OPL3_DECAY_MASK;
 501
 502         /* Set OPL3 ATTACK_DECAY register of requested voice/operator */
 503         opl3_reg = reg_side | (OPL3_REG_ATTACK_DECAY + op_offset);
 504         opl3->command(opl3, opl3_reg, reg_val);
 505
 506         /* Set sustain phase level */
 507         reg_val = (voice->sustain << 4) & OPL3_SUSTAIN_MASK;
 508         /* Set release phase level */
 509         reg_val |= voice->release & OPL3_RELEASE_MASK;
 510
 511         /* Set OPL3 SUSTAIN_RELEASE register of requested voice/operator */
 512         opl3_reg = reg_side | (OPL3_REG_SUSTAIN_RELEASE + op_offset);
 513         opl3->command(opl3, opl3_reg, reg_val);
 514
 515         /* Set inter-operator feedback */
 516         reg_val = (voice->feedback << 1) & OPL3_FEEDBACK_MASK;
 517         /* Set inter-operator connection */
 518         if (voice->connection)
 519                 reg_val |= OPL3_CONNECTION_BIT;
 520         /* OPL-3 only */
 521         if (opl3->fm_mode == SNDRV_DM_FM_MODE_OPL3) {
 522                 if (voice->left)
 523                         reg_val |= OPL3_VOICE_TO_LEFT;
 524                 if (voice->right)
 525                         reg_val |= OPL3_VOICE_TO_RIGHT;
 526         }
 527         /* Feedback/connection bits are applicable to voice */
 528         opl3_reg = reg_side | (OPL3_REG_FEEDBACK_CONNECTION + voice_offset);
 529         opl3->command(opl3, opl3_reg, reg_val);
 530
 531         /* Select waveform */
 532         reg_val = voice->waveform & OPL3_WAVE_SELECT_MASK;
 533         opl3_reg = reg_side | (OPL3_REG_WAVE_SELECT + op_offset);
 534         opl3->command(opl3, opl3_reg, reg_val);
 535
 536         return 0;
 537 }
 538
 539 static int snd_opl3_set_params(struct snd_opl3 * opl3, struct snd_dm_fm_params * params)
 540 {
 541         unsigned char reg_val;
 542
 543         reg_val = 0x00;
 544         /* Set keyboard split method */
 545         if (params->kbd_split)
 546                 reg_val |= OPL3_KEYBOARD_SPLIT;
 547         opl3->command(opl3, OPL3_LEFT | OPL3_REG_KBD_SPLIT, reg_val);
 548
 549         reg_val = 0x00;
 550         /* Set amplitude modulation (tremolo) depth */
 551         if (params->am_depth)
 552                 reg_val |= OPL3_TREMOLO_DEPTH;
 553         /* Set vibrato depth */
 554         if (params->vib_depth)
 555                 reg_val |= OPL3_VIBRATO_DEPTH;
 556         /* Set percussion mode */
 557         if (params->rhythm) {
 558                 reg_val |= OPL3_PERCUSSION_ENABLE;
 559                 opl3->rhythm = 1;
 560         } else {
 561                 opl3->rhythm = 0;
 562         }
 563         /* Play percussion instruments */
 564         if (params->bass)
 565                 reg_val |= OPL3_BASSDRUM_ON;
 566         if (params->snare)
 567                 reg_val |= OPL3_SNAREDRUM_ON;
 568         if (params->tomtom)
 569                 reg_val |= OPL3_TOMTOM_ON;
 570         if (params->cymbal)
 571                 reg_val |= OPL3_CYMBAL_ON;
 572         if (params->hihat)
 573                 reg_val |= OPL3_HIHAT_ON;
 574
 575         opl3->command(opl3, OPL3_LEFT | OPL3_REG_PERCUSSION, reg_val);
 576         return 0;
 577 }
 578
 579 static int snd_opl3_set_mode(struct snd_opl3 * opl3, int mode)
 580 {
 581         if ((mode == SNDRV_DM_FM_MODE_OPL3) && (opl3->hardware < OPL3_HW_OPL3))
 582                 return -EINVAL;
 583
 584         opl3->fm_mode = mode;
 585         if (opl3->hardware >= OPL3_HW_OPL3)
 586                 opl3->command(opl3, OPL3_RIGHT | OPL3_REG_CONNECTION_SELECT, 0x00);     /* Clear 4-op connections */
 587
 588         return 0;
 589 }
 590
 591 static int snd_opl3_set_connection(struct snd_opl3 * opl3, int connection)
 592 {
 593         unsigned char reg_val;
 594
 595         /* OPL-3 only */
 596         if (opl3->fm_mode != SNDRV_DM_FM_MODE_OPL3)
 597                 return -EINVAL;
 598
 599         reg_val = connection & (OPL3_RIGHT_4OP_0 | OPL3_RIGHT_4OP_1 | OPL3_RIGHT_4OP_2 |
 600                                 OPL3_LEFT_4OP_0 | OPL3_LEFT_4OP_1 | OPL3_LEFT_4OP_2);
 601         /* Set 4-op connections */
 602         opl3->command(opl3, OPL3_RIGHT | OPL3_REG_CONNECTION_SELECT, reg_val);
 603
 604         return 0;
 605 }
 606