sound/drivers/opl3/opl3_synth.c

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