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