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 <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  */
  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  */
  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                         memset(&info, 0, sizeof(info));
 109
 110                         info.fm_mode = opl3->fm_mode;
 111                         info.rhythm = opl3->rhythm;
 112                         if (copy_to_user(argp, &info, sizeof(struct snd_dm_fm_info)))
 113                                 return -EFAULT;
 114                         return 0;
 115                 }
 116
 117         case SNDRV_DM_FM_IOCTL_RESET:
 118 #ifdef CONFIG_SND_OSSEMUL
 119         case SNDRV_DM_FM_OSS_IOCTL_RESET:
 120 #endif
 121                 snd_opl3_reset(opl3);
 122                 return 0;
 123
 124         case SNDRV_DM_FM_IOCTL_PLAY_NOTE:
 125 #ifdef CONFIG_SND_OSSEMUL
 126         case SNDRV_DM_FM_OSS_IOCTL_PLAY_NOTE:
 127 #endif
 128                 {
 129                         struct snd_dm_fm_note note;
 130                         if (copy_from_user(&note, argp, sizeof(struct snd_dm_fm_note)))
 131                                 return -EFAULT;
 132                         return snd_opl3_play_note(opl3, &note);
 133                 }
 134
 135         case SNDRV_DM_FM_IOCTL_SET_VOICE:
 136 #ifdef CONFIG_SND_OSSEMUL
 137         case SNDRV_DM_FM_OSS_IOCTL_SET_VOICE:
 138 #endif
 139                 {
 140                         struct snd_dm_fm_voice voice;
 141                         if (copy_from_user(&voice, argp, sizeof(struct snd_dm_fm_voice)))
 142                                 return -EFAULT;
 143                         return snd_opl3_set_voice(opl3, &voice);
 144                 }
 145
 146         case SNDRV_DM_FM_IOCTL_SET_PARAMS:
 147 #ifdef CONFIG_SND_OSSEMUL
 148         case SNDRV_DM_FM_OSS_IOCTL_SET_PARAMS:
 149 #endif
 150                 {
 151                         struct snd_dm_fm_params params;
 152                         if (copy_from_user(&params, argp, sizeof(struct snd_dm_fm_params)))
 153                                 return -EFAULT;
 154                         return snd_opl3_set_params(opl3, &params);
 155                 }
 156
 157         case SNDRV_DM_FM_IOCTL_SET_MODE:
 158 #ifdef CONFIG_SND_OSSEMUL
 159         case SNDRV_DM_FM_OSS_IOCTL_SET_MODE:
 160 #endif
 161                 return snd_opl3_set_mode(opl3, (int) arg);
 162
 163         case SNDRV_DM_FM_IOCTL_SET_CONNECTION:
 164 #ifdef CONFIG_SND_OSSEMUL
 165         case SNDRV_DM_FM_OSS_IOCTL_SET_OPL:
 166 #endif
 167                 return snd_opl3_set_connection(opl3, (int) arg);
 168
 169 #ifdef OPL3_SUPPORT_SYNTH
 170         case SNDRV_DM_FM_IOCTL_CLEAR_PATCHES:
 171                 snd_opl3_clear_patches(opl3);
 172                 return 0;
 173 #endif
 174
 175 #ifdef CONFIG_SND_DEBUG
 176         default:
 177                 snd_printk(KERN_WARNING "unknown IOCTL: 0x%x\n", cmd);
 178 #endif
 179         }
 180         return -ENOTTY;
 181 }
 182
 183 /*
 184  * close the device
 185  */
 186 int snd_opl3_release(struct snd_hwdep * hw, struct file *file)
 187 {
 188         struct snd_opl3 *opl3 = hw->private_data;
 189
 190         snd_opl3_reset(opl3);
 191         return 0;
 192 }
 193
 194 #ifdef OPL3_SUPPORT_SYNTH
 195 /*
 196  * write the device - load patches
 197  */
 198 long snd_opl3_write(struct snd_hwdep *hw, const char __user *buf, long count,
 199                     loff_t *offset)
 200 {
 201         struct snd_opl3 *opl3 = hw->private_data;
 202         long result = 0;
 203         int err = 0;
 204         struct sbi_patch inst;
 205
 206         while (count >= sizeof(inst)) {
 207                 unsigned char type;
 208                 if (copy_from_user(&inst, buf, sizeof(inst)))
 209                         return -EFAULT;
 210                 if (!memcmp(inst.key, FM_KEY_SBI, 4) ||
 211                     !memcmp(inst.key, FM_KEY_2OP, 4))
 212                         type = FM_PATCH_OPL2;
 213                 else if (!memcmp(inst.key, FM_KEY_4OP, 4))
 214                         type = FM_PATCH_OPL3;
 215                 else /* invalid type */
 216                         break;
 217                 err = snd_opl3_load_patch(opl3, inst.prog, inst.bank, type,
 218                                           inst.name, inst.extension,
 219                                           inst.data);
 220                 if (err < 0)
 221                         break;
 222                 result += sizeof(inst);
 223                 count -= sizeof(inst);
 224         }
 225         return result > 0 ? result : err;
 226 }
 227
 228
 229 /*
 230  * Patch management
 231  */
 232
 233 /* offsets for SBI params */
 234 #define AM_VIB          0
 235 #define KSL_LEVEL       2
 236 #define ATTACK_DECAY    4
 237 #define SUSTAIN_RELEASE 6
 238 #define WAVE_SELECT     8
 239
 240 /* offset for SBI instrument */
 241 #define CONNECTION      10
 242 #define OFFSET_4OP      11
 243
 244 /*
 245  * load a patch, obviously.
 246  *
 247  * loaded on the given program and bank numbers with the given type
 248  * (FM_PATCH_OPLx).
 249  * data is the pointer of SBI record _without_ header (key and name).
 250  * name is the name string of the patch.
 251  * ext is the extension data of 7 bytes long (stored in name of SBI
 252  * data up to offset 25), or NULL to skip.
 253  * return 0 if successful or a negative error code.
 254  */
 255 int snd_opl3_load_patch(struct snd_opl3 *opl3,
 256                         int prog, int bank, int type,
 257                         const char *name,
 258                         const unsigned char *ext,
 259                         const unsigned char *data)
 260 {
 261         struct fm_patch *patch;
 262         int i;
 263
 264         patch = snd_opl3_find_patch(opl3, prog, bank, 1);
 265         if (!patch)
 266                 return -ENOMEM;
 267
 268         patch->type = type;
 269
 270         for (i = 0; i < 2; i++) {
 271                 patch->inst.op[i].am_vib = data[AM_VIB + i];
 272                 patch->inst.op[i].ksl_level = data[KSL_LEVEL + i];
 273                 patch->inst.op[i].attack_decay = data[ATTACK_DECAY + i];
 274                 patch->inst.op[i].sustain_release = data[SUSTAIN_RELEASE + i];
 275                 patch->inst.op[i].wave_select = data[WAVE_SELECT + i];
 276         }
 277         patch->inst.feedback_connection[0] = data[CONNECTION];
 278
 279         if (type == FM_PATCH_OPL3) {
 280                 for (i = 0; i < 2; i++) {
 281                         patch->inst.op[i+2].am_vib =
 282                                 data[OFFSET_4OP + AM_VIB + i];
 283                         patch->inst.op[i+2].ksl_level =
 284                                 data[OFFSET_4OP + KSL_LEVEL + i];
 285                         patch->inst.op[i+2].attack_decay =
 286                                 data[OFFSET_4OP + ATTACK_DECAY + i];
 287                         patch->inst.op[i+2].sustain_release =
 288                                 data[OFFSET_4OP + SUSTAIN_RELEASE + i];
 289                         patch->inst.op[i+2].wave_select =
 290                                 data[OFFSET_4OP + WAVE_SELECT + i];
 291                 }
 292                 patch->inst.feedback_connection[1] =
 293                         data[OFFSET_4OP + CONNECTION];
 294         }
 295
 296         if (ext) {
 297                 patch->inst.echo_delay = ext[0];
 298                 patch->inst.echo_atten = ext[1];
 299                 patch->inst.chorus_spread = ext[2];
 300                 patch->inst.trnsps = ext[3];
 301                 patch->inst.fix_dur = ext[4];
 302                 patch->inst.modes = ext[5];
 303                 patch->inst.fix_key = ext[6];
 304         }
 305
 306         if (name)
 307                 strlcpy(patch->name, name, sizeof(patch->name));
 308
 309         return 0;
 310 }
 311 EXPORT_SYMBOL(snd_opl3_load_patch);
 312
 313 /*
 314  * find a patch with the given program and bank numbers, returns its pointer
 315  * if no matching patch is found and create_patch is set, it creates a
 316  * new patch object.
 317  */
 318 struct fm_patch *snd_opl3_find_patch(struct snd_opl3 *opl3, int prog, int bank,
 319                                      int create_patch)
 320 {
 321         /* pretty dumb hash key */
 322         unsigned int key = (prog + bank) % OPL3_PATCH_HASH_SIZE;
 323         struct fm_patch *patch;
 324
 325         for (patch = opl3->patch_table[key]; patch; patch = patch->next) {
 326                 if (patch->prog == prog && patch->bank == bank)
 327                         return patch;
 328         }
 329         if (!create_patch)
 330                 return NULL;
 331
 332         patch = kzalloc(sizeof(*patch), GFP_KERNEL);
 333         if (!patch)
 334                 return NULL;
 335         patch->prog = prog;
 336         patch->bank = bank;
 337         patch->next = opl3->patch_table[key];
 338         opl3->patch_table[key] = patch;
 339         return patch;
 340 }
 341 EXPORT_SYMBOL(snd_opl3_find_patch);
 342
 343 /*
 344  * Clear all patches of the given OPL3 instance
 345  */
 346 void snd_opl3_clear_patches(struct snd_opl3 *opl3)
 347 {
 348         int i;
 349         for (i = 0; i <  OPL3_PATCH_HASH_SIZE; i++) {
 350                 struct fm_patch *patch, *next;
 351                 for (patch = opl3->patch_table[i]; patch; patch = next) {
 352                         next = patch->next;
 353                         kfree(patch);
 354                 }
 355         }
 356         memset(opl3->patch_table, 0, sizeof(opl3->patch_table));
 357 }
 358 #endif /* OPL3_SUPPORT_SYNTH */
 359
 360 /* ------------------------------ */
 361
 362 void snd_opl3_reset(struct snd_opl3 * opl3)
 363 {
 364         unsigned short opl3_reg;
 365
 366         unsigned short reg_side;
 367         unsigned char voice_offset;
 368
 369         int max_voices, i;
 370
 371         max_voices = (opl3->hardware < OPL3_HW_OPL3) ?
 372                 MAX_OPL2_VOICES : MAX_OPL3_VOICES;
 373
 374         for (i = 0; i < max_voices; i++) {
 375                 /* Get register array side and offset of voice */
 376                 if (i < MAX_OPL2_VOICES) {
 377                         /* Left register block for voices 0 .. 8 */
 378                         reg_side = OPL3_LEFT;
 379                         voice_offset = i;
 380                 } else {
 381                         /* Right register block for voices 9 .. 17 */
 382                         reg_side = OPL3_RIGHT;
 383                         voice_offset = i - MAX_OPL2_VOICES;
 384                 }
 385                 opl3_reg = reg_side | (OPL3_REG_KSL_LEVEL + snd_opl3_regmap[voice_offset][0]);
 386                 opl3->command(opl3, opl3_reg, OPL3_TOTAL_LEVEL_MASK); /* Operator 1 volume */
 387                 opl3_reg = reg_side | (OPL3_REG_KSL_LEVEL + snd_opl3_regmap[voice_offset][1]);
 388                 opl3->command(opl3, opl3_reg, OPL3_TOTAL_LEVEL_MASK); /* Operator 2 volume */
 389
 390                 opl3_reg = reg_side | (OPL3_REG_KEYON_BLOCK + voice_offset);
 391                 opl3->command(opl3, opl3_reg, 0x00);    /* Note off */
 392         }
 393
 394         opl3->max_voices = MAX_OPL2_VOICES;
 395         opl3->fm_mode = SNDRV_DM_FM_MODE_OPL2;
 396
 397         opl3->command(opl3, OPL3_LEFT | OPL3_REG_TEST, OPL3_ENABLE_WAVE_SELECT);
 398         opl3->command(opl3, OPL3_LEFT | OPL3_REG_PERCUSSION, 0x00);     /* Melodic mode */
 399         opl3->rhythm = 0;
 400 }
 401
 402 EXPORT_SYMBOL(snd_opl3_reset);
 403
 404 static int snd_opl3_play_note(struct snd_opl3 * opl3, struct snd_dm_fm_note * note)
 405 {
 406         unsigned short reg_side;
 407         unsigned char voice_offset;
 408
 409         unsigned short opl3_reg;
 410         unsigned char reg_val;
 411
 412         /* Voices 0 -  8 in OPL2 mode */
 413         /* Voices 0 - 17 in OPL3 mode */
 414         if (note->voice >= ((opl3->fm_mode == SNDRV_DM_FM_MODE_OPL3) ?
 415                             MAX_OPL3_VOICES : MAX_OPL2_VOICES))
 416                 return -EINVAL;
 417
 418         /* Get register array side and offset of voice */
 419         if (note->voice < MAX_OPL2_VOICES) {
 420                 /* Left register block for voices 0 .. 8 */
 421                 reg_side = OPL3_LEFT;
 422                 voice_offset = note->voice;
 423         } else {
 424                 /* Right register block for voices 9 .. 17 */
 425                 reg_side = OPL3_RIGHT;
 426                 voice_offset = note->voice - MAX_OPL2_VOICES;
 427         }
 428
 429         /* Set lower 8 bits of note frequency */
 430         reg_val = (unsigned char) note->fnum;
 431         opl3_reg = reg_side | (OPL3_REG_FNUM_LOW + voice_offset);
 432         opl3->command(opl3, opl3_reg, reg_val);
 433
 434         reg_val = 0x00;
 435         /* Set output sound flag */
 436         if (note->key_on)
 437                 reg_val |= OPL3_KEYON_BIT;
 438         /* Set octave */
 439         reg_val |= (note->octave << 2) & OPL3_BLOCKNUM_MASK;
 440         /* Set higher 2 bits of note frequency */
 441         reg_val |= (unsigned char) (note->fnum >> 8) & OPL3_FNUM_HIGH_MASK;
 442
 443         /* Set OPL3 KEYON_BLOCK register of requested voice */
 444         opl3_reg = reg_side | (OPL3_REG_KEYON_BLOCK + voice_offset);
 445         opl3->command(opl3, opl3_reg, reg_val);
 446
 447         return 0;
 448 }
 449
 450
 451 static int snd_opl3_set_voice(struct snd_opl3 * opl3, struct snd_dm_fm_voice * voice)
 452 {
 453         unsigned short reg_side;
 454         unsigned char op_offset;
 455         unsigned char voice_offset, voice_op;
 456
 457         unsigned short opl3_reg;
 458         unsigned char reg_val;
 459
 460         /* Only operators 1 and 2 */
 461         if (voice->op > 1)
 462                 return -EINVAL;
 463         /* Voices 0 -  8 in OPL2 mode */
 464         /* Voices 0 - 17 in OPL3 mode */
 465         if (voice->voice >= ((opl3->fm_mode == SNDRV_DM_FM_MODE_OPL3) ?
 466                              MAX_OPL3_VOICES : MAX_OPL2_VOICES))
 467                 return -EINVAL;
 468
 469         /* Get register array side and offset of voice */
 470         if (voice->voice < MAX_OPL2_VOICES) {
 471                 /* Left register block for voices 0 .. 8 */
 472                 reg_side = OPL3_LEFT;
 473                 voice_offset = voice->voice;
 474         } else {
 475                 /* Right register block for voices 9 .. 17 */
 476                 reg_side = OPL3_RIGHT;
 477                 voice_offset = voice->voice - MAX_OPL2_VOICES;
 478         }
 479         /* Get register offset of operator */
 480         voice_offset = array_index_nospec(voice_offset, MAX_OPL2_VOICES);
 481         voice_op = array_index_nospec(voice->op, 4);
 482         op_offset = snd_opl3_regmap[voice_offset][voice_op];
 483
 484         reg_val = 0x00;
 485         /* Set amplitude modulation (tremolo) effect */
 486         if (voice->am)
 487                 reg_val |= OPL3_TREMOLO_ON;
 488         /* Set vibrato effect */
 489         if (voice->vibrato)
 490                 reg_val |= OPL3_VIBRATO_ON;
 491         /* Set sustaining sound phase */
 492         if (voice->do_sustain)
 493                 reg_val |= OPL3_SUSTAIN_ON;
 494         /* Set keyboard scaling bit */
 495         if (voice->kbd_scale)
 496                 reg_val |= OPL3_KSR;
 497         /* Set harmonic or frequency multiplier */
 498         reg_val |= voice->harmonic & OPL3_MULTIPLE_MASK;
 499
 500         /* Set OPL3 AM_VIB register of requested voice/operator */
 501         opl3_reg = reg_side | (OPL3_REG_AM_VIB + op_offset);
 502         opl3->command(opl3, opl3_reg, reg_val);
 503
 504         /* Set decreasing volume of higher notes */
 505         reg_val = (voice->scale_level << 6) & OPL3_KSL_MASK;
 506         /* Set output volume */
 507         reg_val |= ~voice->volume & OPL3_TOTAL_LEVEL_MASK;
 508
 509         /* Set OPL3 KSL_LEVEL register of requested voice/operator */
 510         opl3_reg = reg_side | (OPL3_REG_KSL_LEVEL + op_offset);
 511         opl3->command(opl3, opl3_reg, reg_val);
 512
 513         /* Set attack phase level */
 514         reg_val = (voice->attack << 4) & OPL3_ATTACK_MASK;
 515         /* Set decay phase level */
 516         reg_val |= voice->decay & OPL3_DECAY_MASK;
 517
 518         /* Set OPL3 ATTACK_DECAY register of requested voice/operator */
 519         opl3_reg = reg_side | (OPL3_REG_ATTACK_DECAY + op_offset);
 520         opl3->command(opl3, opl3_reg, reg_val);
 521
 522         /* Set sustain phase level */
 523         reg_val = (voice->sustain << 4) & OPL3_SUSTAIN_MASK;
 524         /* Set release phase level */
 525         reg_val |= voice->release & OPL3_RELEASE_MASK;
 526
 527         /* Set OPL3 SUSTAIN_RELEASE register of requested voice/operator */
 528         opl3_reg = reg_side | (OPL3_REG_SUSTAIN_RELEASE + op_offset);
 529         opl3->command(opl3, opl3_reg, reg_val);
 530
 531         /* Set inter-operator feedback */
 532         reg_val = (voice->feedback << 1) & OPL3_FEEDBACK_MASK;
 533         /* Set inter-operator connection */
 534         if (voice->connection)
 535                 reg_val |= OPL3_CONNECTION_BIT;
 536         /* OPL-3 only */
 537         if (opl3->fm_mode == SNDRV_DM_FM_MODE_OPL3) {
 538                 if (voice->left)
 539                         reg_val |= OPL3_VOICE_TO_LEFT;
 540                 if (voice->right)
 541                         reg_val |= OPL3_VOICE_TO_RIGHT;
 542         }
 543         /* Feedback/connection bits are applicable to voice */
 544         opl3_reg = reg_side | (OPL3_REG_FEEDBACK_CONNECTION + voice_offset);
 545         opl3->command(opl3, opl3_reg, reg_val);
 546
 547         /* Select waveform */
 548         reg_val = voice->waveform & OPL3_WAVE_SELECT_MASK;
 549         opl3_reg = reg_side | (OPL3_REG_WAVE_SELECT + op_offset);
 550         opl3->command(opl3, opl3_reg, reg_val);
 551
 552         return 0;
 553 }
 554
 555 static int snd_opl3_set_params(struct snd_opl3 * opl3, struct snd_dm_fm_params * params)
 556 {
 557         unsigned char reg_val;
 558
 559         reg_val = 0x00;
 560         /* Set keyboard split method */
 561         if (params->kbd_split)
 562                 reg_val |= OPL3_KEYBOARD_SPLIT;
 563         opl3->command(opl3, OPL3_LEFT | OPL3_REG_KBD_SPLIT, reg_val);
 564
 565         reg_val = 0x00;
 566         /* Set amplitude modulation (tremolo) depth */
 567         if (params->am_depth)
 568                 reg_val |= OPL3_TREMOLO_DEPTH;
 569         /* Set vibrato depth */
 570         if (params->vib_depth)
 571                 reg_val |= OPL3_VIBRATO_DEPTH;
 572         /* Set percussion mode */
 573         if (params->rhythm) {
 574                 reg_val |= OPL3_PERCUSSION_ENABLE;
 575                 opl3->rhythm = 1;
 576         } else {
 577                 opl3->rhythm = 0;
 578         }
 579         /* Play percussion instruments */
 580         if (params->bass)
 581                 reg_val |= OPL3_BASSDRUM_ON;
 582         if (params->snare)
 583                 reg_val |= OPL3_SNAREDRUM_ON;
 584         if (params->tomtom)
 585                 reg_val |= OPL3_TOMTOM_ON;
 586         if (params->cymbal)
 587                 reg_val |= OPL3_CYMBAL_ON;
 588         if (params->hihat)
 589                 reg_val |= OPL3_HIHAT_ON;
 590
 591         opl3->command(opl3, OPL3_LEFT | OPL3_REG_PERCUSSION, reg_val);
 592         return 0;
 593 }
 594
 595 static int snd_opl3_set_mode(struct snd_opl3 * opl3, int mode)
 596 {
 597         if ((mode == SNDRV_DM_FM_MODE_OPL3) && (opl3->hardware < OPL3_HW_OPL3))
 598                 return -EINVAL;
 599
 600         opl3->fm_mode = mode;
 601         if (opl3->hardware >= OPL3_HW_OPL3)
 602                 opl3->command(opl3, OPL3_RIGHT | OPL3_REG_CONNECTION_SELECT, 0x00);     /* Clear 4-op connections */
 603
 604         return 0;
 605 }
 606
 607 static int snd_opl3_set_connection(struct snd_opl3 * opl3, int connection)
 608 {
 609         unsigned char reg_val;
 610
 611         /* OPL-3 only */
 612         if (opl3->fm_mode != SNDRV_DM_FM_MODE_OPL3)
 613                 return -EINVAL;
 614
 615         reg_val = connection & (OPL3_RIGHT_4OP_0 | OPL3_RIGHT_4OP_1 | OPL3_RIGHT_4OP_2 |
 616                                 OPL3_LEFT_4OP_0 | OPL3_LEFT_4OP_1 | OPL3_LEFT_4OP_2);
 617         /* Set 4-op connections */
 618         opl3->command(opl3, OPL3_RIGHT | OPL3_REG_CONNECTION_SELECT, reg_val);
 619
 620         return 0;
 621 }
 622