kernel/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 <sound/opl3.h>
  25 #include <sound/asound_fm.h>
  26
  27 #if IS_ENABLED(CONFIG_SND_SEQUENCER)
  28 #define OPL3_SUPPORT_SYNTH
  29 #endif
  30
  31 /*
  32  *    There is 18 possible 2 OP voices
  33  *      (9 in the left and 9 in the right).
  34  *      The first OP is the modulator and 2nd is the carrier.
  35  *
  36  *      The first three voices in the both sides may be connected
  37  *      with another voice to a 4 OP voice. For example voice 0
  38  *      can be connected with voice 3. The operators of voice 3 are
  39  *      used as operators 3 and 4 of the new 4 OP voice.
  40  *      In this case the 2 OP voice number 0 is the 'first half' and
  41  *      voice 3 is the second.
  42  */
  43
  44
  45 /*
  46  *    Register offset table for OPL2/3 voices,
  47  *    OPL2 / one OPL3 register array side only
  48  */
  49
  50 char snd_opl3_regmap[MAX_OPL2_VOICES][4] =
  51 {
  52 /*        OP1   OP2   OP3   OP4         */
  53 /*       ------------------------       */
  54         { 0x00, 0x03, 0x08, 0x0b },
  55         { 0x01, 0x04, 0x09, 0x0c },
  56         { 0x02, 0x05, 0x0a, 0x0d },
  57
  58         { 0x08, 0x0b, 0x00, 0x00 },
  59         { 0x09, 0x0c, 0x00, 0x00 },
  60         { 0x0a, 0x0d, 0x00, 0x00 },
  61
  62         { 0x10, 0x13, 0x00, 0x00 },     /* used by percussive voices */
  63         { 0x11, 0x14, 0x00, 0x00 },     /* if the percussive mode */
  64         { 0x12, 0x15, 0x00, 0x00 }      /* is selected (only left reg block) */
  65 };
  66
  67 EXPORT_SYMBOL(snd_opl3_regmap);
  68
  69 /*
  70  * prototypes
  71  */
  72 static int snd_opl3_play_note(struct snd_opl3 * opl3, struct snd_dm_fm_note * note);
  73 static int snd_opl3_set_voice(struct snd_opl3 * opl3, struct snd_dm_fm_voice * voice);
  74 static int snd_opl3_set_params(struct snd_opl3 * opl3, struct snd_dm_fm_params * params);
  75 static int snd_opl3_set_mode(struct snd_opl3 * opl3, int mode);
  76 static int snd_opl3_set_connection(struct snd_opl3 * opl3, int connection);
  77
  78 /* ------------------------------ */
  79
  80 /*
  81  * open the device exclusively
  82  */
  83 int snd_opl3_open(struct snd_hwdep * hw, struct file *file)
  84 {
  85         return 0;
  86 }
  87
  88 /*
  89  * ioctl for hwdep device:
  90  */
  91 int snd_opl3_ioctl(struct snd_hwdep * hw, struct file *file,
  92                    unsigned int cmd, unsigned long arg)
  93 {
  94         struct snd_opl3 *opl3 = hw->private_data;
  95         void __user *argp = (void __user *)arg;
  96
  97         if (snd_BUG_ON(!opl3))
  98                 return -EINVAL;
  99
 100         switch (cmd) {
 101                 /* get information */
 102         case SNDRV_DM_FM_IOCTL_INFO:
 103                 {
 104                         struct snd_dm_fm_info info;
 105
 106                         info.fm_mode = opl3->fm_mode;
 107                         info.rhythm = opl3->rhythm;
 108                         if (copy_to_user(argp, &info, sizeof(struct snd_dm_fm_info)))
 109                                 return -EFAULT;
 110                         return 0;
 111                 }
 112
 113         case SNDRV_DM_FM_IOCTL_RESET:
 114 #ifdef CONFIG_SND_OSSEMUL
 115         case SNDRV_DM_FM_OSS_IOCTL_RESET:
 116 #endif
 117                 snd_opl3_reset(opl3);
 118                 return 0;
 119
 120         case SNDRV_DM_FM_IOCTL_PLAY_NOTE:
 121 #ifdef CONFIG_SND_OSSEMUL
 122         case SNDRV_DM_FM_OSS_IOCTL_PLAY_NOTE:
 123 #endif
 124                 {
 125                         struct snd_dm_fm_note note;
 126                         if (copy_from_user(&note, argp, sizeof(struct snd_dm_fm_note)))
 127                                 return -EFAULT;
 128                         return snd_opl3_play_note(opl3, &note);
 129                 }
 130
 131         case SNDRV_DM_FM_IOCTL_SET_VOICE:
 132 #ifdef CONFIG_SND_OSSEMUL
 133         case SNDRV_DM_FM_OSS_IOCTL_SET_VOICE:
 134 #endif
 135                 {
 136                         struct snd_dm_fm_voice voice;
 137                         if (copy_from_user(&voice, argp, sizeof(struct snd_dm_fm_voice)))
 138                                 return -EFAULT;
 139                         return snd_opl3_set_voice(opl3, &voice);
 140                 }
 141
 142         case SNDRV_DM_FM_IOCTL_SET_PARAMS:
 143 #ifdef CONFIG_SND_OSSEMUL
 144         case SNDRV_DM_FM_OSS_IOCTL_SET_PARAMS:
 145 #endif
 146                 {
 147                         struct snd_dm_fm_params params;
 148                         if (copy_from_user(&params, argp, sizeof(struct snd_dm_fm_params)))
 149                                 return -EFAULT;
 150                         return snd_opl3_set_params(opl3, &params);
 151                 }
 152
 153         case SNDRV_DM_FM_IOCTL_SET_MODE:
 154 #ifdef CONFIG_SND_OSSEMUL
 155         case SNDRV_DM_FM_OSS_IOCTL_SET_MODE:
 156 #endif
 157                 return snd_opl3_set_mode(opl3, (int) arg);
 158
 159         case SNDRV_DM_FM_IOCTL_SET_CONNECTION:
 160 #ifdef CONFIG_SND_OSSEMUL
 161         case SNDRV_DM_FM_OSS_IOCTL_SET_OPL:
 162 #endif
 163                 return snd_opl3_set_connection(opl3, (int) arg);
 164
 165 #ifdef OPL3_SUPPORT_SYNTH
 166         case SNDRV_DM_FM_IOCTL_CLEAR_PATCHES:
 167                 snd_opl3_clear_patches(opl3);
 168                 return 0;
 169 #endif
 170
 171 #ifdef CONFIG_SND_DEBUG
 172         default:
 173                 snd_printk(KERN_WARNING "unknown IOCTL: 0x%x\n", cmd);
 174 #endif
 175         }
 176         return -ENOTTY;
 177 }
 178
 179 /*
 180  * close the device
 181  */
 182 int snd_opl3_release(struct snd_hwdep * hw, struct file *file)
 183 {
 184         struct snd_opl3 *opl3 = hw->private_data;
 185
 186         snd_opl3_reset(opl3);
 187         return 0;
 188 }
 189
 190 #ifdef OPL3_SUPPORT_SYNTH
 191 /*
 192  * write the device - load patches
 193  */
 194 long snd_opl3_write(struct snd_hwdep *hw, const char __user *buf, long count,
 195                     loff_t *offset)
 196 {
 197         struct snd_opl3 *opl3 = hw->private_data;
 198         long result = 0;
 199         int err = 0;
 200         struct sbi_patch inst;
 201
 202         while (count >= sizeof(inst)) {
 203                 unsigned char type;
 204                 if (copy_from_user(&inst, buf, sizeof(inst)))
 205                         return -EFAULT;
 206                 if (!memcmp(inst.key, FM_KEY_SBI, 4) ||
 207                     !memcmp(inst.key, FM_KEY_2OP, 4))
 208                         type = FM_PATCH_OPL2;
 209                 else if (!memcmp(inst.key, FM_KEY_4OP, 4))
 210                         type = FM_PATCH_OPL3;
 211                 else /* invalid type */
 212                         break;
 213                 err = snd_opl3_load_patch(opl3, inst.prog, inst.bank, type,
 214                                           inst.name, inst.extension,
 215                                           inst.data);
 216                 if (err < 0)
 217                         break;
 218                 result += sizeof(inst);
 219                 count -= sizeof(inst);
 220         }
 221         return result > 0 ? result : err;
 222 }
 223
 224
 225 /*
 226  * Patch management
 227  */
 228
 229 /* offsets for SBI params */
 230 #define AM_VIB          0
 231 #define KSL_LEVEL       2
 232 #define ATTACK_DECAY    4
 233 #define SUSTAIN_RELEASE 6
 234 #define WAVE_SELECT     8
 235
 236 /* offset for SBI instrument */
 237 #define CONNECTION      10
 238 #define OFFSET_4OP      11
 239
 240 /*
 241  * load a patch, obviously.
 242  *
 243  * loaded on the given program and bank numbers with the given type
 244  * (FM_PATCH_OPLx).
 245  * data is the pointer of SBI record _without_ header (key and name).
 246  * name is the name string of the patch.
 247  * ext is the extension data of 7 bytes long (stored in name of SBI
 248  * data up to offset 25), or NULL to skip.
 249  * return 0 if successful or a negative error code.
 250  */
 251 int snd_opl3_load_patch(struct snd_opl3 *opl3,
 252                         int prog, int bank, int type,
 253                         const char *name,
 254                         const unsigned char *ext,
 255                         const unsigned char *data)
 256 {
 257         struct fm_patch *patch;
 258         int i;
 259
 260         patch = snd_opl3_find_patch(opl3, prog, bank, 1);
 261         if (!patch)
 262                 return -ENOMEM;
 263
 264         patch->type = type;
 265
 266         for (i = 0; i < 2; i++) {
 267                 patch->inst.op[i].am_vib = data[AM_VIB + i];
 268                 patch->inst.op[i].ksl_level = data[KSL_LEVEL + i];
 269                 patch->inst.op[i].attack_decay = data[ATTACK_DECAY + i];
 270                 patch->inst.op[i].sustain_release = data[SUSTAIN_RELEASE + i];
 271                 patch->inst.op[i].wave_select = data[WAVE_SELECT + i];
 272         }
 273         patch->inst.feedback_connection[0] = data[CONNECTION];
 274
 275         if (type == FM_PATCH_OPL3) {
 276                 for (i = 0; i < 2; i++) {
 277                         patch->inst.op[i+2].am_vib =
 278                                 data[OFFSET_4OP + AM_VIB + i];
 279                         patch->inst.op[i+2].ksl_level =
 280                                 data[OFFSET_4OP + KSL_LEVEL + i];
 281                         patch->inst.op[i+2].attack_decay =
 282                                 data[OFFSET_4OP + ATTACK_DECAY + i];
 283                         patch->inst.op[i+2].sustain_release =
 284                                 data[OFFSET_4OP + SUSTAIN_RELEASE + i];
 285                         patch->inst.op[i+2].wave_select =
 286                                 data[OFFSET_4OP + WAVE_SELECT + i];
 287                 }
 288                 patch->inst.feedback_connection[1] =
 289                         data[OFFSET_4OP + CONNECTION];
 290         }
 291
 292         if (ext) {
 293                 patch->inst.echo_delay = ext[0];
 294                 patch->inst.echo_atten = ext[1];
 295                 patch->inst.chorus_spread = ext[2];
 296                 patch->inst.trnsps = ext[3];
 297                 patch->inst.fix_dur = ext[4];
 298                 patch->inst.modes = ext[5];
 299                 patch->inst.fix_key = ext[6];
 300         }
 301
 302         if (name)
 303                 strlcpy(patch->name, name, sizeof(patch->name));
 304
 305         return 0;
 306 }
 307 EXPORT_SYMBOL(snd_opl3_load_patch);
 308
 309 /*
 310  * find a patch with the given program and bank numbers, returns its pointer
 311  * if no matching patch is found and create_patch is set, it creates a
 312  * new patch object.
 313  */
 314 struct fm_patch *snd_opl3_find_patch(struct snd_opl3 *opl3, int prog, int bank,
 315                                      int create_patch)
 316 {
 317         /* pretty dumb hash key */
 318         unsigned int key = (prog + bank) % OPL3_PATCH_HASH_SIZE;
 319         struct fm_patch *patch;
 320
 321         for (patch = opl3->patch_table[key]; patch; patch = patch->next) {
 322                 if (patch->prog == prog && patch->bank == bank)
 323                         return patch;
 324         }
 325         if (!create_patch)
 326                 return NULL;
 327
 328         patch = kzalloc(sizeof(*patch), GFP_KERNEL);
 329         if (!patch)
 330                 return NULL;
 331         patch->prog = prog;
 332         patch->bank = bank;
 333         patch->next = opl3->patch_table[key];
 334         opl3->patch_table[key] = patch;
 335         return patch;
 336 }
 337 EXPORT_SYMBOL(snd_opl3_find_patch);
 338
 339 /*
 340  * Clear all patches of the given OPL3 instance
 341  */
 342 void snd_opl3_clear_patches(struct snd_opl3 *opl3)
 343 {
 344         int i;
 345         for (i = 0; i <  OPL3_PATCH_HASH_SIZE; i++) {
 346                 struct fm_patch *patch, *next;
 347                 for (patch = opl3->patch_table[i]; patch; patch = next) {
 348                         next = patch->next;
 349                         kfree(patch);
 350                 }
 351         }
 352         memset(opl3->patch_table, 0, sizeof(opl3->patch_table));
 353 }
 354 #endif /* OPL3_SUPPORT_SYNTH */
 355
 356 /* ------------------------------ */
 357
 358 void snd_opl3_reset(struct snd_opl3 * opl3)
 359 {
 360         unsigned short opl3_reg;
 361
 362         unsigned short reg_side;
 363         unsigned char voice_offset;
 364
 365         int max_voices, i;
 366
 367         max_voices = (opl3->hardware < OPL3_HW_OPL3) ?
 368                 MAX_OPL2_VOICES : MAX_OPL3_VOICES;
 369
 370         for (i = 0; i < max_voices; i++) {
 371                 /* Get register array side and offset of voice */
 372                 if (i < MAX_OPL2_VOICES) {
 373                         /* Left register block for voices 0 .. 8 */
 374                         reg_side = OPL3_LEFT;
 375                         voice_offset = i;
 376                 } else {
 377                         /* Right register block for voices 9 .. 17 */
 378                         reg_side = OPL3_RIGHT;
 379                         voice_offset = i - MAX_OPL2_VOICES;
 380                 }
 381                 opl3_reg = reg_side | (OPL3_REG_KSL_LEVEL + snd_opl3_regmap[voice_offset][0]);
 382                 opl3->command(opl3, opl3_reg, OPL3_TOTAL_LEVEL_MASK); /* Operator 1 volume */
 383                 opl3_reg = reg_side | (OPL3_REG_KSL_LEVEL + snd_opl3_regmap[voice_offset][1]);
 384                 opl3->command(opl3, opl3_reg, OPL3_TOTAL_LEVEL_MASK); /* Operator 2 volume */
 385
 386                 opl3_reg = reg_side | (OPL3_REG_KEYON_BLOCK + voice_offset);
 387                 opl3->command(opl3, opl3_reg, 0x00);    /* Note off */
 388         }
 389
 390         opl3->max_voices = MAX_OPL2_VOICES;
 391         opl3->fm_mode = SNDRV_DM_FM_MODE_OPL2;
 392
 393         opl3->command(opl3, OPL3_LEFT | OPL3_REG_TEST, OPL3_ENABLE_WAVE_SELECT);
 394         opl3->command(opl3, OPL3_LEFT | OPL3_REG_PERCUSSION, 0x00);     /* Melodic mode */
 395         opl3->rhythm = 0;
 396 }
 397
 398 EXPORT_SYMBOL(snd_opl3_reset);
 399
 400 static int snd_opl3_play_note(struct snd_opl3 * opl3, struct snd_dm_fm_note * note)
 401 {
 402         unsigned short reg_side;
 403         unsigned char voice_offset;
 404
 405         unsigned short opl3_reg;
 406         unsigned char reg_val;
 407
 408         /* Voices 0 -  8 in OPL2 mode */
 409         /* Voices 0 - 17 in OPL3 mode */
 410         if (note->voice >= ((opl3->fm_mode == SNDRV_DM_FM_MODE_OPL3) ?
 411                             MAX_OPL3_VOICES : MAX_OPL2_VOICES))
 412                 return -EINVAL;
 413
 414         /* Get register array side and offset of voice */
 415         if (note->voice < MAX_OPL2_VOICES) {
 416                 /* Left register block for voices 0 .. 8 */
 417                 reg_side = OPL3_LEFT;
 418                 voice_offset = note->voice;
 419         } else {
 420                 /* Right register block for voices 9 .. 17 */
 421                 reg_side = OPL3_RIGHT;
 422                 voice_offset = note->voice - MAX_OPL2_VOICES;
 423         }
 424
 425         /* Set lower 8 bits of note frequency */
 426         reg_val = (unsigned char) note->fnum;
 427         opl3_reg = reg_side | (OPL3_REG_FNUM_LOW + voice_offset);
 428         opl3->command(opl3, opl3_reg, reg_val);
 429
 430         reg_val = 0x00;
 431         /* Set output sound flag */
 432         if (note->key_on)
 433                 reg_val |= OPL3_KEYON_BIT;
 434         /* Set octave */
 435         reg_val |= (note->octave << 2) & OPL3_BLOCKNUM_MASK;
 436         /* Set higher 2 bits of note frequency */
 437         reg_val |= (unsigned char) (note->fnum >> 8) & OPL3_FNUM_HIGH_MASK;
 438
 439         /* Set OPL3 KEYON_BLOCK register of requested voice */
 440         opl3_reg = reg_side | (OPL3_REG_KEYON_BLOCK + voice_offset);
 441         opl3->command(opl3, opl3_reg, reg_val);
 442
 443         return 0;
 444 }
 445
 446
 447 static int snd_opl3_set_voice(struct snd_opl3 * opl3, struct snd_dm_fm_voice * voice)
 448 {
 449         unsigned short reg_side;
 450         unsigned char op_offset;
 451         unsigned char voice_offset;
 452
 453         unsigned short opl3_reg;
 454         unsigned char reg_val;
 455
 456         /* Only operators 1 and 2 */
 457         if (voice->op > 1)
 458                 return -EINVAL;
 459         /* Voices 0 -  8 in OPL2 mode */
 460         /* Voices 0 - 17 in OPL3 mode */
 461         if (voice->voice >= ((opl3->fm_mode == SNDRV_DM_FM_MODE_OPL3) ?
 462                              MAX_OPL3_VOICES : MAX_OPL2_VOICES))
 463                 return -EINVAL;
 464
 465         /* Get register array side and offset of voice */
 466         if (voice->voice < MAX_OPL2_VOICES) {
 467                 /* Left register block for voices 0 .. 8 */
 468                 reg_side = OPL3_LEFT;
 469                 voice_offset = voice->voice;
 470         } else {
 471                 /* Right register block for voices 9 .. 17 */
 472                 reg_side = OPL3_RIGHT;
 473                 voice_offset = voice->voice - MAX_OPL2_VOICES;
 474         }
 475         /* Get register offset of operator */
 476         op_offset = snd_opl3_regmap[voice_offset][voice->op];
 477
 478         reg_val = 0x00;
 479         /* Set amplitude modulation (tremolo) effect */
 480         if (voice->am)
 481                 reg_val |= OPL3_TREMOLO_ON;
 482         /* Set vibrato effect */
 483         if (voice->vibrato)
 484                 reg_val |= OPL3_VIBRATO_ON;
 485         /* Set sustaining sound phase */
 486         if (voice->do_sustain)
 487                 reg_val |= OPL3_SUSTAIN_ON;
 488         /* Set keyboard scaling bit */
 489         if (voice->kbd_scale)
 490                 reg_val |= OPL3_KSR;
 491         /* Set harmonic or frequency multiplier */
 492         reg_val |= voice->harmonic & OPL3_MULTIPLE_MASK;
 493
 494         /* Set OPL3 AM_VIB register of requested voice/operator */
 495         opl3_reg = reg_side | (OPL3_REG_AM_VIB + op_offset);
 496         opl3->command(opl3, opl3_reg, reg_val);
 497
 498         /* Set decreasing volume of higher notes */
 499         reg_val = (voice->scale_level << 6) & OPL3_KSL_MASK;
 500         /* Set output volume */
 501         reg_val |= ~voice->volume & OPL3_TOTAL_LEVEL_MASK;
 502
 503         /* Set OPL3 KSL_LEVEL register of requested voice/operator */
 504         opl3_reg = reg_side | (OPL3_REG_KSL_LEVEL + op_offset);
 505         opl3->command(opl3, opl3_reg, reg_val);
 506
 507         /* Set attack phase level */
 508         reg_val = (voice->attack << 4) & OPL3_ATTACK_MASK;
 509         /* Set decay phase level */
 510         reg_val |= voice->decay & OPL3_DECAY_MASK;
 511
 512         /* Set OPL3 ATTACK_DECAY register of requested voice/operator */
 513         opl3_reg = reg_side | (OPL3_REG_ATTACK_DECAY + op_offset);
 514         opl3->command(opl3, opl3_reg, reg_val);
 515
 516         /* Set sustain phase level */
 517         reg_val = (voice->sustain << 4) & OPL3_SUSTAIN_MASK;
 518         /* Set release phase level */
 519         reg_val |= voice->release & OPL3_RELEASE_MASK;
 520
 521         /* Set OPL3 SUSTAIN_RELEASE register of requested voice/operator */
 522         opl3_reg = reg_side | (OPL3_REG_SUSTAIN_RELEASE + op_offset);
 523         opl3->command(opl3, opl3_reg, reg_val);
 524
 525         /* Set inter-operator feedback */
 526         reg_val = (voice->feedback << 1) & OPL3_FEEDBACK_MASK;
 527         /* Set inter-operator connection */
 528         if (voice->connection)
 529                 reg_val |= OPL3_CONNECTION_BIT;
 530         /* OPL-3 only */
 531         if (opl3->fm_mode == SNDRV_DM_FM_MODE_OPL3) {
 532                 if (voice->left)
 533                         reg_val |= OPL3_VOICE_TO_LEFT;
 534                 if (voice->right)
 535                         reg_val |= OPL3_VOICE_TO_RIGHT;
 536         }
 537         /* Feedback/connection bits are applicable to voice */
 538         opl3_reg = reg_side | (OPL3_REG_FEEDBACK_CONNECTION + voice_offset);
 539         opl3->command(opl3, opl3_reg, reg_val);
 540
 541         /* Select waveform */
 542         reg_val = voice->waveform & OPL3_WAVE_SELECT_MASK;
 543         opl3_reg = reg_side | (OPL3_REG_WAVE_SELECT + op_offset);
 544         opl3->command(opl3, opl3_reg, reg_val);
 545
 546         return 0;
 547 }
 548
 549 static int snd_opl3_set_params(struct snd_opl3 * opl3, struct snd_dm_fm_params * params)
 550 {
 551         unsigned char reg_val;
 552
 553         reg_val = 0x00;
 554         /* Set keyboard split method */
 555         if (params->kbd_split)
 556                 reg_val |= OPL3_KEYBOARD_SPLIT;
 557         opl3->command(opl3, OPL3_LEFT | OPL3_REG_KBD_SPLIT, reg_val);
 558
 559         reg_val = 0x00;
 560         /* Set amplitude modulation (tremolo) depth */
 561         if (params->am_depth)
 562                 reg_val |= OPL3_TREMOLO_DEPTH;
 563         /* Set vibrato depth */
 564         if (params->vib_depth)
 565                 reg_val |= OPL3_VIBRATO_DEPTH;
 566         /* Set percussion mode */
 567         if (params->rhythm) {
 568                 reg_val |= OPL3_PERCUSSION_ENABLE;
 569                 opl3->rhythm = 1;
 570         } else {
 571                 opl3->rhythm = 0;
 572         }
 573         /* Play percussion instruments */
 574         if (params->bass)
 575                 reg_val |= OPL3_BASSDRUM_ON;
 576         if (params->snare)
 577                 reg_val |= OPL3_SNAREDRUM_ON;
 578         if (params->tomtom)
 579                 reg_val |= OPL3_TOMTOM_ON;
 580         if (params->cymbal)
 581                 reg_val |= OPL3_CYMBAL_ON;
 582         if (params->hihat)
 583                 reg_val |= OPL3_HIHAT_ON;
 584
 585         opl3->command(opl3, OPL3_LEFT | OPL3_REG_PERCUSSION, reg_val);
 586         return 0;
 587 }
 588
 589 static int snd_opl3_set_mode(struct snd_opl3 * opl3, int mode)
 590 {
 591         if ((mode == SNDRV_DM_FM_MODE_OPL3) && (opl3->hardware < OPL3_HW_OPL3))
 592                 return -EINVAL;
 593
 594         opl3->fm_mode = mode;
 595         if (opl3->hardware >= OPL3_HW_OPL3)
 596                 opl3->command(opl3, OPL3_RIGHT | OPL3_REG_CONNECTION_SELECT, 0x00);     /* Clear 4-op connections */
 597
 598         return 0;
 599 }
 600
 601 static int snd_opl3_set_connection(struct snd_opl3 * opl3, int connection)
 602 {
 603         unsigned char reg_val;
 604
 605         /* OPL-3 only */
 606         if (opl3->fm_mode != SNDRV_DM_FM_MODE_OPL3)
 607                 return -EINVAL;
 608
 609         reg_val = connection & (OPL3_RIGHT_4OP_0 | OPL3_RIGHT_4OP_1 | OPL3_RIGHT_4OP_2 |
 610                                 OPL3_LEFT_4OP_0 | OPL3_LEFT_4OP_1 | OPL3_LEFT_4OP_2);
 611         /* Set 4-op connections */
 612         opl3->command(opl3, OPL3_RIGHT | OPL3_REG_CONNECTION_SELECT, reg_val);
 613
 614         return 0;
 615 }
 616