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                         memset(&info, 0, sizeof(info));
 108
 109                         info.fm_mode = opl3->fm_mode;
 110                         info.rhythm = opl3->rhythm;
 111                         if (copy_to_user(argp, &info, sizeof(struct snd_dm_fm_info)))
 112                                 return -EFAULT;
 113                         return 0;
 114                 }
 115
 116         case SNDRV_DM_FM_IOCTL_RESET:
 117 #ifdef CONFIG_SND_OSSEMUL
 118         case SNDRV_DM_FM_OSS_IOCTL_RESET:
 119 #endif
 120                 snd_opl3_reset(opl3);
 121                 return 0;
 122
 123         case SNDRV_DM_FM_IOCTL_PLAY_NOTE:
 124 #ifdef CONFIG_SND_OSSEMUL
 125         case SNDRV_DM_FM_OSS_IOCTL_PLAY_NOTE:
 126 #endif
 127                 {
 128                         struct snd_dm_fm_note note;
 129                         if (copy_from_user(&note, argp, sizeof(struct snd_dm_fm_note)))
 130                                 return -EFAULT;
 131                         return snd_opl3_play_note(opl3, &note);
 132                 }
 133
 134         case SNDRV_DM_FM_IOCTL_SET_VOICE:
 135 #ifdef CONFIG_SND_OSSEMUL
 136         case SNDRV_DM_FM_OSS_IOCTL_SET_VOICE:
 137 #endif
 138                 {
 139                         struct snd_dm_fm_voice voice;
 140                         if (copy_from_user(&voice, argp, sizeof(struct snd_dm_fm_voice)))
 141                                 return -EFAULT;
 142                         return snd_opl3_set_voice(opl3, &voice);
 143                 }
 144
 145         case SNDRV_DM_FM_IOCTL_SET_PARAMS:
 146 #ifdef CONFIG_SND_OSSEMUL
 147         case SNDRV_DM_FM_OSS_IOCTL_SET_PARAMS:
 148 #endif
 149                 {
 150                         struct snd_dm_fm_params params;
 151                         if (copy_from_user(&params, argp, sizeof(struct snd_dm_fm_params)))
 152                                 return -EFAULT;
 153                         return snd_opl3_set_params(opl3, &params);
 154                 }
 155
 156         case SNDRV_DM_FM_IOCTL_SET_MODE:
 157 #ifdef CONFIG_SND_OSSEMUL
 158         case SNDRV_DM_FM_OSS_IOCTL_SET_MODE:
 159 #endif
 160                 return snd_opl3_set_mode(opl3, (int) arg);
 161
 162         case SNDRV_DM_FM_IOCTL_SET_CONNECTION:
 163 #ifdef CONFIG_SND_OSSEMUL
 164         case SNDRV_DM_FM_OSS_IOCTL_SET_OPL:
 165 #endif
 166                 return snd_opl3_set_connection(opl3, (int) arg);
 167
 168 #ifdef OPL3_SUPPORT_SYNTH
 169         case SNDRV_DM_FM_IOCTL_CLEAR_PATCHES:
 170                 snd_opl3_clear_patches(opl3);
 171                 return 0;
 172 #endif
 173
 174 #ifdef CONFIG_SND_DEBUG
 175         default:
 176                 snd_printk(KERN_WARNING "unknown IOCTL: 0x%x\n", cmd);
 177 #endif
 178         }
 179         return -ENOTTY;
 180 }
 181
 182 /*
 183  * close the device
 184  */
 185 int snd_opl3_release(struct snd_hwdep * hw, struct file *file)
 186 {
 187         struct snd_opl3 *opl3 = hw->private_data;
 188
 189         snd_opl3_reset(opl3);
 190         return 0;
 191 }
 192
 193 #ifdef OPL3_SUPPORT_SYNTH
 194 /*
 195  * write the device - load patches
 196  */
 197 long snd_opl3_write(struct snd_hwdep *hw, const char __user *buf, long count,
 198                     loff_t *offset)
 199 {
 200         struct snd_opl3 *opl3 = hw->private_data;
 201         long result = 0;
 202         int err = 0;
 203         struct sbi_patch inst;
 204
 205         while (count >= sizeof(inst)) {
 206                 unsigned char type;
 207                 if (copy_from_user(&inst, buf, sizeof(inst)))
 208                         return -EFAULT;
 209                 if (!memcmp(inst.key, FM_KEY_SBI, 4) ||
 210                     !memcmp(inst.key, FM_KEY_2OP, 4))
 211                         type = FM_PATCH_OPL2;
 212                 else if (!memcmp(inst.key, FM_KEY_4OP, 4))
 213                         type = FM_PATCH_OPL3;
 214                 else /* invalid type */
 215                         break;
 216                 err = snd_opl3_load_patch(opl3, inst.prog, inst.bank, type,
 217                                           inst.name, inst.extension,
 218                                           inst.data);
 219                 if (err < 0)
 220                         break;
 221                 result += sizeof(inst);
 222                 count -= sizeof(inst);
 223         }
 224         return result > 0 ? result : err;
 225 }
 226
 227
 228 /*
 229  * Patch management
 230  */
 231
 232 /* offsets for SBI params */
 233 #define AM_VIB          0
 234 #define KSL_LEVEL       2
 235 #define ATTACK_DECAY    4
 236 #define SUSTAIN_RELEASE 6
 237 #define WAVE_SELECT     8
 238
 239 /* offset for SBI instrument */
 240 #define CONNECTION      10
 241 #define OFFSET_4OP      11
 242
 243 /*
 244  * load a patch, obviously.
 245  *
 246  * loaded on the given program and bank numbers with the given type
 247  * (FM_PATCH_OPLx).
 248  * data is the pointer of SBI record _without_ header (key and name).
 249  * name is the name string of the patch.
 250  * ext is the extension data of 7 bytes long (stored in name of SBI
 251  * data up to offset 25), or NULL to skip.
 252  * return 0 if successful or a negative error code.
 253  */
 254 int snd_opl3_load_patch(struct snd_opl3 *opl3,
 255                         int prog, int bank, int type,
 256                         const char *name,
 257                         const unsigned char *ext,
 258                         const unsigned char *data)
 259 {
 260         struct fm_patch *patch;
 261         int i;
 262
 263         patch = snd_opl3_find_patch(opl3, prog, bank, 1);
 264         if (!patch)
 265                 return -ENOMEM;
 266
 267         patch->type = type;
 268
 269         for (i = 0; i < 2; i++) {
 270                 patch->inst.op[i].am_vib = data[AM_VIB + i];
 271                 patch->inst.op[i].ksl_level = data[KSL_LEVEL + i];
 272                 patch->inst.op[i].attack_decay = data[ATTACK_DECAY + i];
 273                 patch->inst.op[i].sustain_release = data[SUSTAIN_RELEASE + i];
 274                 patch->inst.op[i].wave_select = data[WAVE_SELECT + i];
 275         }
 276         patch->inst.feedback_connection[0] = data[CONNECTION];
 277
 278         if (type == FM_PATCH_OPL3) {
 279                 for (i = 0; i < 2; i++) {
 280                         patch->inst.op[i+2].am_vib =
 281                                 data[OFFSET_4OP + AM_VIB + i];
 282                         patch->inst.op[i+2].ksl_level =
 283                                 data[OFFSET_4OP + KSL_LEVEL + i];
 284                         patch->inst.op[i+2].attack_decay =
 285                                 data[OFFSET_4OP + ATTACK_DECAY + i];
 286                         patch->inst.op[i+2].sustain_release =
 287                                 data[OFFSET_4OP + SUSTAIN_RELEASE + i];
 288                         patch->inst.op[i+2].wave_select =
 289                                 data[OFFSET_4OP + WAVE_SELECT + i];
 290                 }
 291                 patch->inst.feedback_connection[1] =
 292                         data[OFFSET_4OP + CONNECTION];
 293         }
 294
 295         if (ext) {
 296                 patch->inst.echo_delay = ext[0];
 297                 patch->inst.echo_atten = ext[1];
 298                 patch->inst.chorus_spread = ext[2];
 299                 patch->inst.trnsps = ext[3];
 300                 patch->inst.fix_dur = ext[4];
 301                 patch->inst.modes = ext[5];
 302                 patch->inst.fix_key = ext[6];
 303         }
 304
 305         if (name)
 306                 strlcpy(patch->name, name, sizeof(patch->name));
 307
 308         return 0;
 309 }
 310 EXPORT_SYMBOL(snd_opl3_load_patch);
 311
 312 /*
 313  * find a patch with the given program and bank numbers, returns its pointer
 314  * if no matching patch is found and create_patch is set, it creates a
 315  * new patch object.
 316  */
 317 struct fm_patch *snd_opl3_find_patch(struct snd_opl3 *opl3, int prog, int bank,
 318                                      int create_patch)
 319 {
 320         /* pretty dumb hash key */
 321         unsigned int key = (prog + bank) % OPL3_PATCH_HASH_SIZE;
 322         struct fm_patch *patch;
 323
 324         for (patch = opl3->patch_table[key]; patch; patch = patch->next) {
 325                 if (patch->prog == prog && patch->bank == bank)
 326                         return patch;
 327         }
 328         if (!create_patch)
 329                 return NULL;
 330
 331         patch = kzalloc(sizeof(*patch), GFP_KERNEL);
 332         if (!patch)
 333                 return NULL;
 334         patch->prog = prog;
 335         patch->bank = bank;
 336         patch->next = opl3->patch_table[key];
 337         opl3->patch_table[key] = patch;
 338         return patch;
 339 }
 340 EXPORT_SYMBOL(snd_opl3_find_patch);
 341
 342 /*
 343  * Clear all patches of the given OPL3 instance
 344  */
 345 void snd_opl3_clear_patches(struct snd_opl3 *opl3)
 346 {
 347         int i;
 348         for (i = 0; i <  OPL3_PATCH_HASH_SIZE; i++) {
 349                 struct fm_patch *patch, *next;
 350                 for (patch = opl3->patch_table[i]; patch; patch = next) {
 351                         next = patch->next;
 352                         kfree(patch);
 353                 }
 354         }
 355         memset(opl3->patch_table, 0, sizeof(opl3->patch_table));
 356 }
 357 #endif /* OPL3_SUPPORT_SYNTH */
 358
 359 /* ------------------------------ */
 360
 361 void snd_opl3_reset(struct snd_opl3 * opl3)
 362 {
 363         unsigned short opl3_reg;
 364
 365         unsigned short reg_side;
 366         unsigned char voice_offset;
 367
 368         int max_voices, i;
 369
 370         max_voices = (opl3->hardware < OPL3_HW_OPL3) ?
 371                 MAX_OPL2_VOICES : MAX_OPL3_VOICES;
 372
 373         for (i = 0; i < max_voices; i++) {
 374                 /* Get register array side and offset of voice */
 375                 if (i < MAX_OPL2_VOICES) {
 376                         /* Left register block for voices 0 .. 8 */
 377                         reg_side = OPL3_LEFT;
 378                         voice_offset = i;
 379                 } else {
 380                         /* Right register block for voices 9 .. 17 */
 381                         reg_side = OPL3_RIGHT;
 382                         voice_offset = i - MAX_OPL2_VOICES;
 383                 }
 384                 opl3_reg = reg_side | (OPL3_REG_KSL_LEVEL + snd_opl3_regmap[voice_offset][0]);
 385                 opl3->command(opl3, opl3_reg, OPL3_TOTAL_LEVEL_MASK); /* Operator 1 volume */
 386                 opl3_reg = reg_side | (OPL3_REG_KSL_LEVEL + snd_opl3_regmap[voice_offset][1]);
 387                 opl3->command(opl3, opl3_reg, OPL3_TOTAL_LEVEL_MASK); /* Operator 2 volume */
 388
 389                 opl3_reg = reg_side | (OPL3_REG_KEYON_BLOCK + voice_offset);
 390                 opl3->command(opl3, opl3_reg, 0x00);    /* Note off */
 391         }
 392
 393         opl3->max_voices = MAX_OPL2_VOICES;
 394         opl3->fm_mode = SNDRV_DM_FM_MODE_OPL2;
 395
 396         opl3->command(opl3, OPL3_LEFT | OPL3_REG_TEST, OPL3_ENABLE_WAVE_SELECT);
 397         opl3->command(opl3, OPL3_LEFT | OPL3_REG_PERCUSSION, 0x00);     /* Melodic mode */
 398         opl3->rhythm = 0;
 399 }
 400
 401 EXPORT_SYMBOL(snd_opl3_reset);
 402
 403 static int snd_opl3_play_note(struct snd_opl3 * opl3, struct snd_dm_fm_note * note)
 404 {
 405         unsigned short reg_side;
 406         unsigned char voice_offset;
 407
 408         unsigned short opl3_reg;
 409         unsigned char reg_val;
 410
 411         /* Voices 0 -  8 in OPL2 mode */
 412         /* Voices 0 - 17 in OPL3 mode */
 413         if (note->voice >= ((opl3->fm_mode == SNDRV_DM_FM_MODE_OPL3) ?
 414                             MAX_OPL3_VOICES : MAX_OPL2_VOICES))
 415                 return -EINVAL;
 416
 417         /* Get register array side and offset of voice */
 418         if (note->voice < MAX_OPL2_VOICES) {
 419                 /* Left register block for voices 0 .. 8 */
 420                 reg_side = OPL3_LEFT;
 421                 voice_offset = note->voice;
 422         } else {
 423                 /* Right register block for voices 9 .. 17 */
 424                 reg_side = OPL3_RIGHT;
 425                 voice_offset = note->voice - MAX_OPL2_VOICES;
 426         }
 427
 428         /* Set lower 8 bits of note frequency */
 429         reg_val = (unsigned char) note->fnum;
 430         opl3_reg = reg_side | (OPL3_REG_FNUM_LOW + voice_offset);
 431         opl3->command(opl3, opl3_reg, reg_val);
 432
 433         reg_val = 0x00;
 434         /* Set output sound flag */
 435         if (note->key_on)
 436                 reg_val |= OPL3_KEYON_BIT;
 437         /* Set octave */
 438         reg_val |= (note->octave << 2) & OPL3_BLOCKNUM_MASK;
 439         /* Set higher 2 bits of note frequency */
 440         reg_val |= (unsigned char) (note->fnum >> 8) & OPL3_FNUM_HIGH_MASK;
 441
 442         /* Set OPL3 KEYON_BLOCK register of requested voice */
 443         opl3_reg = reg_side | (OPL3_REG_KEYON_BLOCK + voice_offset);
 444         opl3->command(opl3, opl3_reg, reg_val);
 445
 446         return 0;
 447 }
 448
 449
 450 static int snd_opl3_set_voice(struct snd_opl3 * opl3, struct snd_dm_fm_voice * voice)
 451 {
 452         unsigned short reg_side;
 453         unsigned char op_offset;
 454         unsigned char voice_offset, voice_op;
 455
 456         unsigned short opl3_reg;
 457         unsigned char reg_val;
 458
 459         /* Only operators 1 and 2 */
 460         if (voice->op > 1)
 461                 return -EINVAL;
 462         /* Voices 0 -  8 in OPL2 mode */
 463         /* Voices 0 - 17 in OPL3 mode */
 464         if (voice->voice >= ((opl3->fm_mode == SNDRV_DM_FM_MODE_OPL3) ?
 465                              MAX_OPL3_VOICES : MAX_OPL2_VOICES))
 466                 return -EINVAL;
 467
 468         /* Get register array side and offset of voice */
 469         if (voice->voice < MAX_OPL2_VOICES) {
 470                 /* Left register block for voices 0 .. 8 */
 471                 reg_side = OPL3_LEFT;
 472                 voice_offset = voice->voice;
 473         } else {
 474                 /* Right register block for voices 9 .. 17 */
 475                 reg_side = OPL3_RIGHT;
 476                 voice_offset = voice->voice - MAX_OPL2_VOICES;
 477         }
 478         /* Get register offset of operator */
 479         voice_offset = array_index_nospec(voice_offset, MAX_OPL2_VOICES);
 480         voice_op = array_index_nospec(voice->op, 4);
 481         op_offset = snd_opl3_regmap[voice_offset][voice_op];
 482
 483         reg_val = 0x00;
 484         /* Set amplitude modulation (tremolo) effect */
 485         if (voice->am)
 486                 reg_val |= OPL3_TREMOLO_ON;
 487         /* Set vibrato effect */
 488         if (voice->vibrato)
 489                 reg_val |= OPL3_VIBRATO_ON;
 490         /* Set sustaining sound phase */
 491         if (voice->do_sustain)
 492                 reg_val |= OPL3_SUSTAIN_ON;
 493         /* Set keyboard scaling bit */
 494         if (voice->kbd_scale)
 495                 reg_val |= OPL3_KSR;
 496         /* Set harmonic or frequency multiplier */
 497         reg_val |= voice->harmonic & OPL3_MULTIPLE_MASK;
 498
 499         /* Set OPL3 AM_VIB register of requested voice/operator */
 500         opl3_reg = reg_side | (OPL3_REG_AM_VIB + op_offset);
 501         opl3->command(opl3, opl3_reg, reg_val);
 502
 503         /* Set decreasing volume of higher notes */
 504         reg_val = (voice->scale_level << 6) & OPL3_KSL_MASK;
 505         /* Set output volume */
 506         reg_val |= ~voice->volume & OPL3_TOTAL_LEVEL_MASK;
 507
 508         /* Set OPL3 KSL_LEVEL register of requested voice/operator */
 509         opl3_reg = reg_side | (OPL3_REG_KSL_LEVEL + op_offset);
 510         opl3->command(opl3, opl3_reg, reg_val);
 511
 512         /* Set attack phase level */
 513         reg_val = (voice->attack << 4) & OPL3_ATTACK_MASK;
 514         /* Set decay phase level */
 515         reg_val |= voice->decay & OPL3_DECAY_MASK;
 516
 517         /* Set OPL3 ATTACK_DECAY register of requested voice/operator */
 518         opl3_reg = reg_side | (OPL3_REG_ATTACK_DECAY + op_offset);
 519         opl3->command(opl3, opl3_reg, reg_val);
 520
 521         /* Set sustain phase level */
 522         reg_val = (voice->sustain << 4) & OPL3_SUSTAIN_MASK;
 523         /* Set release phase level */
 524         reg_val |= voice->release & OPL3_RELEASE_MASK;
 525
 526         /* Set OPL3 SUSTAIN_RELEASE register of requested voice/operator */
 527         opl3_reg = reg_side | (OPL3_REG_SUSTAIN_RELEASE + op_offset);
 528         opl3->command(opl3, opl3_reg, reg_val);
 529
 530         /* Set inter-operator feedback */
 531         reg_val = (voice->feedback << 1) & OPL3_FEEDBACK_MASK;
 532         /* Set inter-operator connection */
 533         if (voice->connection)
 534                 reg_val |= OPL3_CONNECTION_BIT;
 535         /* OPL-3 only */
 536         if (opl3->fm_mode == SNDRV_DM_FM_MODE_OPL3) {
 537                 if (voice->left)
 538                         reg_val |= OPL3_VOICE_TO_LEFT;
 539                 if (voice->right)
 540                         reg_val |= OPL3_VOICE_TO_RIGHT;
 541         }
 542         /* Feedback/connection bits are applicable to voice */
 543         opl3_reg = reg_side | (OPL3_REG_FEEDBACK_CONNECTION + voice_offset);
 544         opl3->command(opl3, opl3_reg, reg_val);
 545
 546         /* Select waveform */
 547         reg_val = voice->waveform & OPL3_WAVE_SELECT_MASK;
 548         opl3_reg = reg_side | (OPL3_REG_WAVE_SELECT + op_offset);
 549         opl3->command(opl3, opl3_reg, reg_val);
 550
 551         return 0;
 552 }
 553
 554 static int snd_opl3_set_params(struct snd_opl3 * opl3, struct snd_dm_fm_params * params)
 555 {
 556         unsigned char reg_val;
 557
 558         reg_val = 0x00;
 559         /* Set keyboard split method */
 560         if (params->kbd_split)
 561                 reg_val |= OPL3_KEYBOARD_SPLIT;
 562         opl3->command(opl3, OPL3_LEFT | OPL3_REG_KBD_SPLIT, reg_val);
 563
 564         reg_val = 0x00;
 565         /* Set amplitude modulation (tremolo) depth */
 566         if (params->am_depth)
 567                 reg_val |= OPL3_TREMOLO_DEPTH;
 568         /* Set vibrato depth */
 569         if (params->vib_depth)
 570                 reg_val |= OPL3_VIBRATO_DEPTH;
 571         /* Set percussion mode */
 572         if (params->rhythm) {
 573                 reg_val |= OPL3_PERCUSSION_ENABLE;
 574                 opl3->rhythm = 1;
 575         } else {
 576                 opl3->rhythm = 0;
 577         }
 578         /* Play percussion instruments */
 579         if (params->bass)
 580                 reg_val |= OPL3_BASSDRUM_ON;
 581         if (params->snare)
 582                 reg_val |= OPL3_SNAREDRUM_ON;
 583         if (params->tomtom)
 584                 reg_val |= OPL3_TOMTOM_ON;
 585         if (params->cymbal)
 586                 reg_val |= OPL3_CYMBAL_ON;
 587         if (params->hihat)
 588                 reg_val |= OPL3_HIHAT_ON;
 589
 590         opl3->command(opl3, OPL3_LEFT | OPL3_REG_PERCUSSION, reg_val);
 591         return 0;
 592 }
 593
 594 static int snd_opl3_set_mode(struct snd_opl3 * opl3, int mode)
 595 {
 596         if ((mode == SNDRV_DM_FM_MODE_OPL3) && (opl3->hardware < OPL3_HW_OPL3))
 597                 return -EINVAL;
 598
 599         opl3->fm_mode = mode;
 600         if (opl3->hardware >= OPL3_HW_OPL3)
 601                 opl3->command(opl3, OPL3_RIGHT | OPL3_REG_CONNECTION_SELECT, 0x00);     /* Clear 4-op connections */
 602
 603         return 0;
 604 }
 605
 606 static int snd_opl3_set_connection(struct snd_opl3 * opl3, int connection)
 607 {
 608         unsigned char reg_val;
 609
 610         /* OPL-3 only */
 611         if (opl3->fm_mode != SNDRV_DM_FM_MODE_OPL3)
 612                 return -EINVAL;
 613
 614         reg_val = connection & (OPL3_RIGHT_4OP_0 | OPL3_RIGHT_4OP_1 | OPL3_RIGHT_4OP_2 |
 615                                 OPL3_LEFT_4OP_0 | OPL3_LEFT_4OP_1 | OPL3_LEFT_4OP_2);
 616         /* Set 4-op connections */
 617         opl3->command(opl3, OPL3_RIGHT | OPL3_REG_CONNECTION_SELECT, reg_val);
 618
 619         return 0;
 620 }
 621