diff options
Diffstat (limited to 'sound/drivers/opl3/opl3_drums.c')
| -rw-r--r-- | sound/drivers/opl3/opl3_drums.c | 210 |
1 files changed, 210 insertions, 0 deletions
diff --git a/sound/drivers/opl3/opl3_drums.c b/sound/drivers/opl3/opl3_drums.c new file mode 100644 index 0000000000..ccc49f3940 --- /dev/null +++ b/sound/drivers/opl3/opl3_drums.c @@ -0,0 +1,210 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * Copyright (c) by Uros Bizjak <uros@kss-loka.si> + * + * OPL2/OPL3/OPL4 FM routines for internal percussion channels + */ + +#include "opl3_voice.h" + +static const char snd_opl3_drum_table[47] = +{ + OPL3_BASSDRUM_ON, OPL3_BASSDRUM_ON, OPL3_HIHAT_ON, /* 35 - 37 */ + OPL3_SNAREDRUM_ON, OPL3_HIHAT_ON, OPL3_SNAREDRUM_ON, /* 38 - 40 */ + OPL3_BASSDRUM_ON, OPL3_HIHAT_ON, OPL3_BASSDRUM_ON, /* 41 - 43 */ + OPL3_HIHAT_ON, OPL3_TOMTOM_ON, OPL3_HIHAT_ON, /* 44 - 46 */ + OPL3_TOMTOM_ON, OPL3_TOMTOM_ON, OPL3_CYMBAL_ON, /* 47 - 49 */ + + OPL3_TOMTOM_ON, OPL3_CYMBAL_ON, OPL3_CYMBAL_ON, /* 50 - 52 */ + OPL3_CYMBAL_ON, OPL3_CYMBAL_ON, OPL3_CYMBAL_ON, /* 53 - 55 */ + OPL3_HIHAT_ON, OPL3_CYMBAL_ON, OPL3_TOMTOM_ON, /* 56 - 58 */ + OPL3_CYMBAL_ON, OPL3_TOMTOM_ON, OPL3_TOMTOM_ON, /* 59 - 61 */ + OPL3_HIHAT_ON, OPL3_TOMTOM_ON, OPL3_TOMTOM_ON, /* 62 - 64 */ + + OPL3_TOMTOM_ON, OPL3_TOMTOM_ON, OPL3_TOMTOM_ON, /* 65 - 67 */ + OPL3_TOMTOM_ON, OPL3_HIHAT_ON, OPL3_HIHAT_ON, /* 68 - 70 */ + OPL3_HIHAT_ON, OPL3_HIHAT_ON, OPL3_TOMTOM_ON, /* 71 - 73 */ + OPL3_TOMTOM_ON, OPL3_TOMTOM_ON, OPL3_TOMTOM_ON, /* 74 - 76 */ + OPL3_TOMTOM_ON, OPL3_TOMTOM_ON, OPL3_TOMTOM_ON, /* 77 - 79 */ + OPL3_CYMBAL_ON, OPL3_CYMBAL_ON /* 80 - 81 */ +}; + +struct snd_opl3_drum_voice { + int voice; + int op; + unsigned char am_vib; + unsigned char ksl_level; + unsigned char attack_decay; + unsigned char sustain_release; + unsigned char feedback_connection; + unsigned char wave_select; +}; + +struct snd_opl3_drum_note { + int voice; + unsigned char fnum; + unsigned char octave_f; + unsigned char feedback_connection; +}; + +static const struct snd_opl3_drum_voice bass_op0 = {6, 0, 0x00, 0x32, 0xf8, 0x66, 0x30, 0x00}; +static const struct snd_opl3_drum_voice bass_op1 = {6, 1, 0x00, 0x03, 0xf6, 0x57, 0x30, 0x00}; +static const struct snd_opl3_drum_note bass_note = {6, 0x90, 0x09}; + +static const struct snd_opl3_drum_voice hihat = {7, 0, 0x00, 0x03, 0xf0, 0x06, 0x20, 0x00}; + +static const struct snd_opl3_drum_voice snare = {7, 1, 0x00, 0x03, 0xf0, 0x07, 0x20, 0x02}; +static const struct snd_opl3_drum_note snare_note = {7, 0xf4, 0x0d}; + +static const struct snd_opl3_drum_voice tomtom = {8, 0, 0x02, 0x03, 0xf0, 0x06, 0x10, 0x00}; +static const struct snd_opl3_drum_note tomtom_note = {8, 0xf4, 0x09}; + +static const struct snd_opl3_drum_voice cymbal = {8, 1, 0x04, 0x03, 0xf0, 0x06, 0x10, 0x00}; + +/* + * set drum voice characteristics + */ +static void snd_opl3_drum_voice_set(struct snd_opl3 *opl3, + const struct snd_opl3_drum_voice *data) +{ + unsigned char op_offset = snd_opl3_regmap[data->voice][data->op]; + unsigned char voice_offset = data->voice; + unsigned short opl3_reg; + + /* Set OPL3 AM_VIB register */ + opl3_reg = OPL3_LEFT | (OPL3_REG_AM_VIB + op_offset); + opl3->command(opl3, opl3_reg, data->am_vib); + + /* Set OPL3 KSL_LEVEL register */ + opl3_reg = OPL3_LEFT | (OPL3_REG_KSL_LEVEL + op_offset); + opl3->command(opl3, opl3_reg, data->ksl_level); + + /* Set OPL3 ATTACK_DECAY register */ + opl3_reg = OPL3_LEFT | (OPL3_REG_ATTACK_DECAY + op_offset); + opl3->command(opl3, opl3_reg, data->attack_decay); + + /* Set OPL3 SUSTAIN_RELEASE register */ + opl3_reg = OPL3_LEFT | (OPL3_REG_SUSTAIN_RELEASE + op_offset); + opl3->command(opl3, opl3_reg, data->sustain_release); + + /* Set OPL3 FEEDBACK_CONNECTION register */ + opl3_reg = OPL3_LEFT | (OPL3_REG_FEEDBACK_CONNECTION + voice_offset); + opl3->command(opl3, opl3_reg, data->feedback_connection); + + /* Select waveform */ + opl3_reg = OPL3_LEFT | (OPL3_REG_WAVE_SELECT + op_offset); + opl3->command(opl3, opl3_reg, data->wave_select); +} + +/* + * Set drum voice pitch + */ +static void snd_opl3_drum_note_set(struct snd_opl3 *opl3, + const struct snd_opl3_drum_note *data) +{ + unsigned char voice_offset = data->voice; + unsigned short opl3_reg; + + /* Set OPL3 FNUM_LOW register */ + opl3_reg = OPL3_LEFT | (OPL3_REG_FNUM_LOW + voice_offset); + opl3->command(opl3, opl3_reg, data->fnum); + + /* Set OPL3 KEYON_BLOCK register */ + opl3_reg = OPL3_LEFT | (OPL3_REG_KEYON_BLOCK + voice_offset); + opl3->command(opl3, opl3_reg, data->octave_f); +} + +/* + * Set drum voice volume and position + */ +static void snd_opl3_drum_vol_set(struct snd_opl3 *opl3, + const struct snd_opl3_drum_voice *data, + int vel, struct snd_midi_channel *chan) +{ + unsigned char op_offset = snd_opl3_regmap[data->voice][data->op]; + unsigned char voice_offset = data->voice; + unsigned char reg_val; + unsigned short opl3_reg; + + /* Set OPL3 KSL_LEVEL register */ + reg_val = data->ksl_level; + snd_opl3_calc_volume(®_val, vel, chan); + opl3_reg = OPL3_LEFT | (OPL3_REG_KSL_LEVEL + op_offset); + opl3->command(opl3, opl3_reg, reg_val); + + /* Set OPL3 FEEDBACK_CONNECTION register */ + /* Set output voice connection */ + reg_val = data->feedback_connection | OPL3_STEREO_BITS; + if (chan->gm_pan < 43) + reg_val &= ~OPL3_VOICE_TO_RIGHT; + if (chan->gm_pan > 85) + reg_val &= ~OPL3_VOICE_TO_LEFT; + opl3_reg = OPL3_LEFT | (OPL3_REG_FEEDBACK_CONNECTION + voice_offset); + opl3->command(opl3, opl3_reg, reg_val); +} + +/* + * Loads drum voices at init time + */ +void snd_opl3_load_drums(struct snd_opl3 *opl3) +{ + snd_opl3_drum_voice_set(opl3, &bass_op0); + snd_opl3_drum_voice_set(opl3, &bass_op1); + snd_opl3_drum_note_set(opl3, &bass_note); + + snd_opl3_drum_voice_set(opl3, &hihat); + + snd_opl3_drum_voice_set(opl3, &snare); + snd_opl3_drum_note_set(opl3, &snare_note); + + snd_opl3_drum_voice_set(opl3, &tomtom); + snd_opl3_drum_note_set(opl3, &tomtom_note); + + snd_opl3_drum_voice_set(opl3, &cymbal); +} + +/* + * Switch drum voice on or off + */ +void snd_opl3_drum_switch(struct snd_opl3 *opl3, int note, int vel, int on_off, + struct snd_midi_channel *chan) +{ + unsigned char drum_mask; + const struct snd_opl3_drum_voice *drum_voice; + + if (!(opl3->drum_reg & OPL3_PERCUSSION_ENABLE)) + return; + + if ((note < 35) || (note > 81)) + return; + drum_mask = snd_opl3_drum_table[note - 35]; + + if (on_off) { + switch (drum_mask) { + case OPL3_BASSDRUM_ON: + drum_voice = &bass_op1; + break; + case OPL3_HIHAT_ON: + drum_voice = &hihat; + break; + case OPL3_SNAREDRUM_ON: + drum_voice = &snare; + break; + case OPL3_TOMTOM_ON: + drum_voice = &tomtom; + break; + case OPL3_CYMBAL_ON: + drum_voice = &cymbal; + break; + default: + drum_voice = &tomtom; + } + + snd_opl3_drum_vol_set(opl3, drum_voice, vel, chan); + opl3->drum_reg |= drum_mask; + } else { + opl3->drum_reg &= ~drum_mask; + } + opl3->command(opl3, OPL3_LEFT | OPL3_REG_PERCUSSION, + opl3->drum_reg); +} |