sound/drivers/opl3/opl3_synth.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  *  Copyright (c) by Uros Bizjak <uros@kss-loka.si>
   4  *
   5  *  Routines for OPL2/OPL3/OPL4 control
   6  */
   7
   8 #include <linux/slab.h>
   9 #include <linux/export.h>
  10 #include <linux/nospec.h>
  11 #include <sound/opl3.h>
  12 #include <sound/asound_fm.h>
  13 #include "opl3_voice.h"
  14
  15 #if IS_ENABLED(CONFIG_SND_SEQUENCER)
  16 #define OPL3_SUPPORT_SYNTH
  17 #endif
  18
  19 /*
  20  *    There is 18 possible 2 OP voices
  21  *      (9 in the left and 9 in the right).
  22  *      The first OP is the modulator and 2nd is the carrier.
  23  *
  24  *      The first three voices in the both sides may be connected
  25  *      with another voice to a 4 OP voice. For example voice 0
  26  *      can be connected with voice 3. The operators of voice 3 are
  27  *      used as operators 3 and 4 of the new 4 OP voice.
  28  *      In this case the 2 OP voice number 0 is the 'first half' and
  29  *      voice 3 is the second.
  30  */
  31
  32
  33 /*
  34  *    Register offset table for OPL2/3 voices,
  35  *    OPL2 / one OPL3 register array side only
  36  */
  37
  38 char snd_opl3_regmap[MAX_OPL2_VOICES][4] =
  39 {
  40 /*        OP1   OP2   OP3   OP4         */
  41 /*       ------------------------       */
  42         { 0x00, 0x03, 0x08, 0x0b },
  43         { 0x01, 0x04, 0x09, 0x0c },
  44         { 0x02, 0x05, 0x0a, 0x0d },
  45
  46         { 0x08, 0x0b, 0x00, 0x00 },
  47         { 0x09, 0x0c, 0x00, 0x00 },
  48         { 0x0a, 0x0d, 0x00, 0x00 },
  49
  50         { 0x10, 0x13, 0x00, 0x00 },     /* used by percussive voices */
  51         { 0x11, 0x14, 0x00, 0x00 },     /* if the percussive mode */
  52         { 0x12, 0x15, 0x00, 0x00 }      /* is selected (only left reg block) */
  53 };
  54
  55 EXPORT_SYMBOL(snd_opl3_regmap);
  56
  57 /*
  58  * prototypes
  59  */
  60 static int snd_opl3_play_note(struct snd_opl3 * opl3, struct snd_dm_fm_note * note);
  61 static int snd_opl3_set_voice(struct snd_opl3 * opl3, struct snd_dm_fm_voice * voice);
  62 static int snd_opl3_set_params(struct snd_opl3 * opl3, struct snd_dm_fm_params * params);
  63 static int snd_opl3_set_mode(struct snd_opl3 * opl3, int mode);
  64 static int snd_opl3_set_connection(struct snd_opl3 * opl3, int connection);
  65
  66 /* ------------------------------ */
  67
  68 /*
  69  * open the device exclusively
  70  */
  71 int snd_opl3_open(struct snd_hwdep * hw, struct file *file)
  72 {
  73         return 0;
  74 }
  75
  76 /*
  77  * ioctl for hwdep device:
  78  */
  79 int snd_opl3_ioctl(struct snd_hwdep * hw, struct file *file,
  80                    unsigned int cmd, unsigned long arg)
  81 {
  82         struct snd_opl3 *opl3 = hw->private_data;
  83         void __user *argp = (void __user *)arg;
  84
  85         if (snd_BUG_ON(!opl3))
  86                 return -EINVAL;
  87
  88         switch (cmd) {
  89                 /* get information */
  90         case SNDRV_DM_FM_IOCTL_INFO:
  91                 {
  92                         struct snd_dm_fm_info info;
  93
  94                         memset(&info, 0, sizeof(info));
  95
  96                         info.fm_mode = opl3->fm_mode;
  97                         info.rhythm = opl3->rhythm;
  98                         if (copy_to_user(argp, &info, sizeof(struct snd_dm_fm_info)))
  99                                 return -EFAULT;
 100                         return 0;
 101                 }
 102
 103         case SNDRV_DM_FM_IOCTL_RESET:
 104 #ifdef CONFIG_SND_OSSEMUL
 105         case SNDRV_DM_FM_OSS_IOCTL_RESET:
 106 #endif
 107                 snd_opl3_reset(opl3);
 108                 return 0;
 109
 110         case SNDRV_DM_FM_IOCTL_PLAY_NOTE:
 111 #ifdef CONFIG_SND_OSSEMUL
 112         case SNDRV_DM_FM_OSS_IOCTL_PLAY_NOTE:
 113 #endif
 114                 {
 115                         struct snd_dm_fm_note note;
 116                         if (copy_from_user(&note, argp, sizeof(struct snd_dm_fm_note)))
 117                                 return -EFAULT;
 118                         return snd_opl3_play_note(opl3, &note);
 119                 }
 120
 121         case SNDRV_DM_FM_IOCTL_SET_VOICE:
 122 #ifdef CONFIG_SND_OSSEMUL
 123         case SNDRV_DM_FM_OSS_IOCTL_SET_VOICE:
 124 #endif
 125                 {
 126                         struct snd_dm_fm_voice voice;
 127                         if (copy_from_user(&voice, argp, sizeof(struct snd_dm_fm_voice)))
 128                                 return -EFAULT;
 129                         return snd_opl3_set_voice(opl3, &voice);
 130                 }
 131
 132         case SNDRV_DM_FM_IOCTL_SET_PARAMS:
 133 #ifdef CONFIG_SND_OSSEMUL
 134         case SNDRV_DM_FM_OSS_IOCTL_SET_PARAMS:
 135 #endif
 136                 {
 137                         struct snd_dm_fm_params params;
 138                         if (copy_from_user(&params, argp, sizeof(struct snd_dm_fm_params)))
 139                                 return -EFAULT;
 140                         return snd_opl3_set_params(opl3, &params);
 141                 }
 142
 143         case SNDRV_DM_FM_IOCTL_SET_MODE:
 144 #ifdef CONFIG_SND_OSSEMUL
 145         case SNDRV_DM_FM_OSS_IOCTL_SET_MODE:
 146 #endif
 147                 return snd_opl3_set_mode(opl3, (int) arg);
 148
 149         case SNDRV_DM_FM_IOCTL_SET_CONNECTION:
 150 #ifdef CONFIG_SND_OSSEMUL
 151         case SNDRV_DM_FM_OSS_IOCTL_SET_OPL:
 152 #endif
 153                 return snd_opl3_set_connection(opl3, (int) arg);
 154
 155 #ifdef OPL3_SUPPORT_SYNTH
 156         case SNDRV_DM_FM_IOCTL_CLEAR_PATCHES:
 157                 snd_opl3_clear_patches(opl3);
 158                 return 0;
 159 #endif
 160
 161 #ifdef CONFIG_SND_DEBUG
 162         default:
 163                 snd_printk(KERN_WARNING "unknown IOCTL: 0x%x\n", cmd);
 164 #endif
 165         }
 166         return -ENOTTY;
 167 }
 168
 169 /*
 170  * close the device
 171  */
 172 int snd_opl3_release(struct snd_hwdep * hw, struct file *file)
 173 {
 174         struct snd_opl3 *opl3 = hw->private_data;
 175
 176         snd_opl3_reset(opl3);
 177         return 0;
 178 }
 179
 180 #ifdef OPL3_SUPPORT_SYNTH
 181 /*
 182  * write the device - load patches
 183  */
 184 long snd_opl3_write(struct snd_hwdep *hw, const char __user *buf, long count,
 185                     loff_t *offset)
 186 {
 187         struct snd_opl3 *opl3 = hw->private_data;
 188         long result = 0;
 189         int err = 0;
 190         struct sbi_patch inst;
 191
 192         while (count >= sizeof(inst)) {
 193                 unsigned char type;
 194                 if (copy_from_user(&inst, buf, sizeof(inst)))
 195                         return -EFAULT;
 196                 if (!memcmp(inst.key, FM_KEY_SBI, 4) ||
 197                     !memcmp(inst.key, FM_KEY_2OP, 4))
 198                         type = FM_PATCH_OPL2;
 199                 else if (!memcmp(inst.key, FM_KEY_4OP, 4))
 200                         type = FM_PATCH_OPL3;
 201                 else /* invalid type */
 202                         break;
 203                 err = snd_opl3_load_patch(opl3, inst.prog, inst.bank, type,
 204                                           inst.name, inst.extension,
 205                                           inst.data);
 206                 if (err < 0)
 207                         break;
 208                 result += sizeof(inst);
 209                 count -= sizeof(inst);
 210         }
 211         return result > 0 ? result : err;
 212 }
 213
 214
 215 /*
 216  * Patch management
 217  */
 218
 219 /* offsets for SBI params */
 220 #define AM_VIB          0
 221 #define KSL_LEVEL       2
 222 #define ATTACK_DECAY    4
 223 #define SUSTAIN_RELEASE 6
 224 #define WAVE_SELECT     8
 225
 226 /* offset for SBI instrument */
 227 #define CONNECTION      10
 228 #define OFFSET_4OP      11
 229
 230 /*
 231  * load a patch, obviously.
 232  *
 233  * loaded on the given program and bank numbers with the given type
 234  * (FM_PATCH_OPLx).
 235  * data is the pointer of SBI record _without_ header (key and name).
 236  * name is the name string of the patch.
 237  * ext is the extension data of 7 bytes long (stored in name of SBI
 238  * data up to offset 25), or NULL to skip.
 239  * return 0 if successful or a negative error code.
 240  */
 241 int snd_opl3_load_patch(struct snd_opl3 *opl3,
 242                         int prog, int bank, int type,
 243                         const char *name,
 244                         const unsigned char *ext,
 245                         const unsigned char *data)
 246 {
 247         struct fm_patch *patch;
 248         int i;
 249
 250         patch = snd_opl3_find_patch(opl3, prog, bank, 1);
 251         if (!patch)
 252                 return -ENOMEM;
 253
 254         patch->type = type;
 255
 256         for (i = 0; i < 2; i++) {
 257                 patch->inst.op[i].am_vib = data[AM_VIB + i];
 258                 patch->inst.op[i].ksl_level = data[KSL_LEVEL + i];
 259                 patch->inst.op[i].attack_decay = data[ATTACK_DECAY + i];
 260                 patch->inst.op[i].sustain_release = data[SUSTAIN_RELEASE + i];
 261                 patch->inst.op[i].wave_select = data[WAVE_SELECT + i];
 262         }
 263         patch->inst.feedback_connection[0] = data[CONNECTION];
 264
 265         if (type == FM_PATCH_OPL3) {
 266                 for (i = 0; i < 2; i++) {
 267                         patch->inst.op[i+2].am_vib =
 268                                 data[OFFSET_4OP + AM_VIB + i];
 269                         patch->inst.op[i+2].ksl_level =
 270                                 data[OFFSET_4OP + KSL_LEVEL + i];
 271                         patch->inst.op[i+2].attack_decay =
 272                                 data[OFFSET_4OP + ATTACK_DECAY + i];
 273                         patch->inst.op[i+2].sustain_release =
 274                                 data[OFFSET_4OP + SUSTAIN_RELEASE + i];
 275                         patch->inst.op[i+2].wave_select =
 276                                 data[OFFSET_4OP + WAVE_SELECT + i];
 277                 }
 278                 patch->inst.feedback_connection[1] =
 279                         data[OFFSET_4OP + CONNECTION];
 280         }
 281
 282         if (ext) {
 283                 patch->inst.echo_delay = ext[0];
 284                 patch->inst.echo_atten = ext[1];
 285                 patch->inst.chorus_spread = ext[2];
 286                 patch->inst.trnsps = ext[3];
 287                 patch->inst.fix_dur = ext[4];
 288                 patch->inst.modes = ext[5];
 289                 patch->inst.fix_key = ext[6];
 290         }
 291
 292         if (name)
 293                 strscpy(patch->name, name, sizeof(patch->name));
 294
 295         return 0;
 296 }
 297 EXPORT_SYMBOL(snd_opl3_load_patch);
 298
 299 /*
 300  * find a patch with the given program and bank numbers, returns its pointer
 301  * if no matching patch is found and create_patch is set, it creates a
 302  * new patch object.
 303  */
 304 struct fm_patch *snd_opl3_find_patch(struct snd_opl3 *opl3, int prog, int bank,
 305                                      int create_patch)
 306 {
 307         /* pretty dumb hash key */
 308         unsigned int key = (prog + bank) % OPL3_PATCH_HASH_SIZE;
 309         struct fm_patch *patch;
 310
 311         for (patch = opl3->patch_table[key]; patch; patch = patch->next) {
 312                 if (patch->prog == prog && patch->bank == bank)
 313                         return patch;
 314         }
 315         if (!create_patch)
 316                 return NULL;
 317
 318         patch = kzalloc(sizeof(*patch), GFP_KERNEL);
 319         if (!patch)
 320                 return NULL;
 321         patch->prog = prog;
 322         patch->bank = bank;
 323         patch->next = opl3->patch_table[key];
 324         opl3->patch_table[key] = patch;
 325         return patch;
 326 }
 327 EXPORT_SYMBOL(snd_opl3_find_patch);
 328
 329 /*
 330  * Clear all patches of the given OPL3 instance
 331  */
 332 void snd_opl3_clear_patches(struct snd_opl3 *opl3)
 333 {
 334         int i;
 335         for (i = 0; i <  OPL3_PATCH_HASH_SIZE; i++) {
 336                 struct fm_patch *patch, *next;
 337                 for (patch = opl3->patch_table[i]; patch; patch = next) {
 338                         next = patch->next;
 339                         kfree(patch);
 340                 }
 341         }
 342         memset(opl3->patch_table, 0, sizeof(opl3->patch_table));
 343 }
 344 #endif /* OPL3_SUPPORT_SYNTH */
 345
 346 /* ------------------------------ */
 347
 348 void snd_opl3_reset(struct snd_opl3 * opl3)
 349 {
 350         unsigned short opl3_reg;
 351
 352         unsigned short reg_side;
 353         unsigned char voice_offset;
 354
 355         int max_voices, i;
 356
 357         max_voices = (opl3->hardware < OPL3_HW_OPL3) ?
 358                 MAX_OPL2_VOICES : MAX_OPL3_VOICES;
 359
 360         for (i = 0; i < max_voices; i++) {
 361                 /* Get register array side and offset of voice */
 362                 if (i < MAX_OPL2_VOICES) {
 363                         /* Left register block for voices 0 .. 8 */
 364                         reg_side = OPL3_LEFT;
 365                         voice_offset = i;
 366                 } else {
 367                         /* Right register block for voices 9 .. 17 */
 368                         reg_side = OPL3_RIGHT;
 369                         voice_offset = i - MAX_OPL2_VOICES;
 370                 }
 371                 opl3_reg = reg_side | (OPL3_REG_KSL_LEVEL + snd_opl3_regmap[voice_offset][0]);
 372                 opl3->command(opl3, opl3_reg, OPL3_TOTAL_LEVEL_MASK); /* Operator 1 volume */
 373                 opl3_reg = reg_side | (OPL3_REG_KSL_LEVEL + snd_opl3_regmap[voice_offset][1]);
 374                 opl3->command(opl3, opl3_reg, OPL3_TOTAL_LEVEL_MASK); /* Operator 2 volume */
 375
 376                 opl3_reg = reg_side | (OPL3_REG_KEYON_BLOCK + voice_offset);
 377                 opl3->command(opl3, opl3_reg, 0x00);    /* Note off */
 378         }
 379
 380         opl3->max_voices = MAX_OPL2_VOICES;
 381         opl3->fm_mode = SNDRV_DM_FM_MODE_OPL2;
 382
 383         opl3->command(opl3, OPL3_LEFT | OPL3_REG_TEST, OPL3_ENABLE_WAVE_SELECT);
 384         opl3->command(opl3, OPL3_LEFT | OPL3_REG_PERCUSSION, 0x00);     /* Melodic mode */
 385         opl3->rhythm = 0;
 386 }
 387
 388 EXPORT_SYMBOL(snd_opl3_reset);
 389
 390 static int snd_opl3_play_note(struct snd_opl3 * opl3, struct snd_dm_fm_note * note)
 391 {
 392         unsigned short reg_side;
 393         unsigned char voice_offset;
 394
 395         unsigned short opl3_reg;
 396         unsigned char reg_val;
 397
 398         /* Voices 0 -  8 in OPL2 mode */
 399         /* Voices 0 - 17 in OPL3 mode */
 400         if (note->voice >= ((opl3->fm_mode == SNDRV_DM_FM_MODE_OPL3) ?
 401                             MAX_OPL3_VOICES : MAX_OPL2_VOICES))
 402                 return -EINVAL;
 403
 404         /* Get register array side and offset of voice */
 405         if (note->voice < MAX_OPL2_VOICES) {
 406                 /* Left register block for voices 0 .. 8 */
 407                 reg_side = OPL3_LEFT;
 408                 voice_offset = note->voice;
 409         } else {
 410                 /* Right register block for voices 9 .. 17 */
 411                 reg_side = OPL3_RIGHT;
 412                 voice_offset = note->voice - MAX_OPL2_VOICES;
 413         }
 414
 415         /* Set lower 8 bits of note frequency */
 416         reg_val = (unsigned char) note->fnum;
 417         opl3_reg = reg_side | (OPL3_REG_FNUM_LOW + voice_offset);
 418         opl3->command(opl3, opl3_reg, reg_val);
 419
 420         reg_val = 0x00;
 421         /* Set output sound flag */
 422         if (note->key_on)
 423                 reg_val |= OPL3_KEYON_BIT;
 424         /* Set octave */
 425         reg_val |= (note->octave << 2) & OPL3_BLOCKNUM_MASK;
 426         /* Set higher 2 bits of note frequency */
 427         reg_val |= (unsigned char) (note->fnum >> 8) & OPL3_FNUM_HIGH_MASK;
 428
 429         /* Set OPL3 KEYON_BLOCK register of requested voice */
 430         opl3_reg = reg_side | (OPL3_REG_KEYON_BLOCK + voice_offset);
 431         opl3->command(opl3, opl3_reg, reg_val);
 432
 433         return 0;
 434 }
 435
 436
 437 static int snd_opl3_set_voice(struct snd_opl3 * opl3, struct snd_dm_fm_voice * voice)
 438 {
 439         unsigned short reg_side;
 440         unsigned char op_offset;
 441         unsigned char voice_offset, voice_op;
 442
 443         unsigned short opl3_reg;
 444         unsigned char reg_val;
 445
 446         /* Only operators 1 and 2 */
 447         if (voice->op > 1)
 448                 return -EINVAL;
 449         /* Voices 0 -  8 in OPL2 mode */
 450         /* Voices 0 - 17 in OPL3 mode */
 451         if (voice->voice >= ((opl3->fm_mode == SNDRV_DM_FM_MODE_OPL3) ?
 452                              MAX_OPL3_VOICES : MAX_OPL2_VOICES))
 453                 return -EINVAL;
 454
 455         /* Get register array side and offset of voice */
 456         if (voice->voice < MAX_OPL2_VOICES) {
 457                 /* Left register block for voices 0 .. 8 */
 458                 reg_side = OPL3_LEFT;
 459                 voice_offset = voice->voice;
 460         } else {
 461                 /* Right register block for voices 9 .. 17 */
 462                 reg_side = OPL3_RIGHT;
 463                 voice_offset = voice->voice - MAX_OPL2_VOICES;
 464         }
 465         /* Get register offset of operator */
 466         voice_offset = array_index_nospec(voice_offset, MAX_OPL2_VOICES);
 467         voice_op = array_index_nospec(voice->op, 4);
 468         op_offset = snd_opl3_regmap[voice_offset][voice_op];
 469
 470         reg_val = 0x00;
 471         /* Set amplitude modulation (tremolo) effect */
 472         if (voice->am)
 473                 reg_val |= OPL3_TREMOLO_ON;
 474         /* Set vibrato effect */
 475         if (voice->vibrato)
 476                 reg_val |= OPL3_VIBRATO_ON;
 477         /* Set sustaining sound phase */
 478         if (voice->do_sustain)
 479                 reg_val |= OPL3_SUSTAIN_ON;
 480         /* Set keyboard scaling bit */
 481         if (voice->kbd_scale)
 482                 reg_val |= OPL3_KSR;
 483         /* Set harmonic or frequency multiplier */
 484         reg_val |= voice->harmonic & OPL3_MULTIPLE_MASK;
 485
 486         /* Set OPL3 AM_VIB register of requested voice/operator */
 487         opl3_reg = reg_side | (OPL3_REG_AM_VIB + op_offset);
 488         opl3->command(opl3, opl3_reg, reg_val);
 489
 490         /* Set decreasing volume of higher notes */
 491         reg_val = (voice->scale_level << 6) & OPL3_KSL_MASK;
 492         /* Set output volume */
 493         reg_val |= ~voice->volume & OPL3_TOTAL_LEVEL_MASK;
 494
 495         /* Set OPL3 KSL_LEVEL register of requested voice/operator */
 496         opl3_reg = reg_side | (OPL3_REG_KSL_LEVEL + op_offset);
 497         opl3->command(opl3, opl3_reg, reg_val);
 498
 499         /* Set attack phase level */
 500         reg_val = (voice->attack << 4) & OPL3_ATTACK_MASK;
 501         /* Set decay phase level */
 502         reg_val |= voice->decay & OPL3_DECAY_MASK;
 503
 504         /* Set OPL3 ATTACK_DECAY register of requested voice/operator */
 505         opl3_reg = reg_side | (OPL3_REG_ATTACK_DECAY + op_offset);
 506         opl3->command(opl3, opl3_reg, reg_val);
 507
 508         /* Set sustain phase level */
 509         reg_val = (voice->sustain << 4) & OPL3_SUSTAIN_MASK;
 510         /* Set release phase level */
 511         reg_val |= voice->release & OPL3_RELEASE_MASK;
 512
 513         /* Set OPL3 SUSTAIN_RELEASE register of requested voice/operator */
 514         opl3_reg = reg_side | (OPL3_REG_SUSTAIN_RELEASE + op_offset);
 515         opl3->command(opl3, opl3_reg, reg_val);
 516
 517         /* Set inter-operator feedback */
 518         reg_val = (voice->feedback << 1) & OPL3_FEEDBACK_MASK;
 519         /* Set inter-operator connection */
 520         if (voice->connection)
 521                 reg_val |= OPL3_CONNECTION_BIT;
 522         /* OPL-3 only */
 523         if (opl3->fm_mode == SNDRV_DM_FM_MODE_OPL3) {
 524                 if (voice->left)
 525                         reg_val |= OPL3_VOICE_TO_LEFT;
 526                 if (voice->right)
 527                         reg_val |= OPL3_VOICE_TO_RIGHT;
 528         }
 529         /* Feedback/connection bits are applicable to voice */
 530         opl3_reg = reg_side | (OPL3_REG_FEEDBACK_CONNECTION + voice_offset);
 531         opl3->command(opl3, opl3_reg, reg_val);
 532
 533         /* Select waveform */
 534         reg_val = voice->waveform & OPL3_WAVE_SELECT_MASK;
 535         opl3_reg = reg_side | (OPL3_REG_WAVE_SELECT + op_offset);
 536         opl3->command(opl3, opl3_reg, reg_val);
 537
 538         return 0;
 539 }
 540
 541 static int snd_opl3_set_params(struct snd_opl3 * opl3, struct snd_dm_fm_params * params)
 542 {
 543         unsigned char reg_val;
 544
 545         reg_val = 0x00;
 546         /* Set keyboard split method */
 547         if (params->kbd_split)
 548                 reg_val |= OPL3_KEYBOARD_SPLIT;
 549         opl3->command(opl3, OPL3_LEFT | OPL3_REG_KBD_SPLIT, reg_val);
 550
 551         reg_val = 0x00;
 552         /* Set amplitude modulation (tremolo) depth */
 553         if (params->am_depth)
 554                 reg_val |= OPL3_TREMOLO_DEPTH;
 555         /* Set vibrato depth */
 556         if (params->vib_depth)
 557                 reg_val |= OPL3_VIBRATO_DEPTH;
 558         /* Set percussion mode */
 559         if (params->rhythm) {
 560                 reg_val |= OPL3_PERCUSSION_ENABLE;
 561                 opl3->rhythm = 1;
 562         } else {
 563                 opl3->rhythm = 0;
 564         }
 565         /* Play percussion instruments */
 566         if (params->bass)
 567                 reg_val |= OPL3_BASSDRUM_ON;
 568         if (params->snare)
 569                 reg_val |= OPL3_SNAREDRUM_ON;
 570         if (params->tomtom)
 571                 reg_val |= OPL3_TOMTOM_ON;
 572         if (params->cymbal)
 573                 reg_val |= OPL3_CYMBAL_ON;
 574         if (params->hihat)
 575                 reg_val |= OPL3_HIHAT_ON;
 576
 577         opl3->command(opl3, OPL3_LEFT | OPL3_REG_PERCUSSION, reg_val);
 578         return 0;
 579 }
 580
 581 static int snd_opl3_set_mode(struct snd_opl3 * opl3, int mode)
 582 {
 583         if ((mode == SNDRV_DM_FM_MODE_OPL3) && (opl3->hardware < OPL3_HW_OPL3))
 584                 return -EINVAL;
 585
 586         opl3->fm_mode = mode;
 587         if (opl3->hardware >= OPL3_HW_OPL3)
 588                 opl3->command(opl3, OPL3_RIGHT | OPL3_REG_CONNECTION_SELECT, 0x00);     /* Clear 4-op connections */
 589
 590         return 0;
 591 }
 592
 593 static int snd_opl3_set_connection(struct snd_opl3 * opl3, int connection)
 594 {
 595         unsigned char reg_val;
 596
 597         /* OPL-3 only */
 598         if (opl3->fm_mode != SNDRV_DM_FM_MODE_OPL3)
 599                 return -EINVAL;
 600
 601         reg_val = connection & (OPL3_RIGHT_4OP_0 | OPL3_RIGHT_4OP_1 | OPL3_RIGHT_4OP_2 |
 602                                 OPL3_LEFT_4OP_0 | OPL3_LEFT_4OP_1 | OPL3_LEFT_4OP_2);
 603         /* Set 4-op connections */
 604         opl3->command(opl3, OPL3_RIGHT | OPL3_REG_CONNECTION_SELECT, reg_val);
 605
 606         return 0;
 607 }
 608