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