1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3  *  Copyright (c) by Uros Bizjak <uros@kss-loka.si>
4  *
5  *   OPL2/OPL3/OPL4 FM routines for internal percussion channels
6  */
7 
8 #include "opl3_voice.h"
9 
10 static const char snd_opl3_drum_table[47] =
11 {
12 	OPL3_BASSDRUM_ON,  OPL3_BASSDRUM_ON,  OPL3_HIHAT_ON,	/* 35 - 37 */
13 	OPL3_SNAREDRUM_ON, OPL3_HIHAT_ON,     OPL3_SNAREDRUM_ON, /* 38 - 40 */
14 	OPL3_BASSDRUM_ON,  OPL3_HIHAT_ON,     OPL3_BASSDRUM_ON,	/* 41 - 43 */
15 	OPL3_HIHAT_ON,     OPL3_TOMTOM_ON,    OPL3_HIHAT_ON,	/* 44 - 46 */
16 	OPL3_TOMTOM_ON,    OPL3_TOMTOM_ON,    OPL3_CYMBAL_ON,	/* 47 - 49 */
17 
18 	OPL3_TOMTOM_ON,    OPL3_CYMBAL_ON,    OPL3_CYMBAL_ON,	/* 50 - 52 */
19 	OPL3_CYMBAL_ON,    OPL3_CYMBAL_ON,    OPL3_CYMBAL_ON,	/* 53 - 55 */
20 	OPL3_HIHAT_ON,     OPL3_CYMBAL_ON,    OPL3_TOMTOM_ON,	/* 56 - 58 */
21 	OPL3_CYMBAL_ON,    OPL3_TOMTOM_ON,    OPL3_TOMTOM_ON,	/* 59 - 61 */
22 	OPL3_HIHAT_ON,     OPL3_TOMTOM_ON,    OPL3_TOMTOM_ON,	/* 62 - 64 */
23 
24 	OPL3_TOMTOM_ON,    OPL3_TOMTOM_ON,    OPL3_TOMTOM_ON,	/* 65 - 67 */
25 	OPL3_TOMTOM_ON,    OPL3_HIHAT_ON,     OPL3_HIHAT_ON,	/* 68 - 70 */
26 	OPL3_HIHAT_ON,     OPL3_HIHAT_ON,     OPL3_TOMTOM_ON,	/* 71 - 73 */
27 	OPL3_TOMTOM_ON,    OPL3_TOMTOM_ON,    OPL3_TOMTOM_ON,	/* 74 - 76 */
28 	OPL3_TOMTOM_ON,    OPL3_TOMTOM_ON,    OPL3_TOMTOM_ON,	/* 77 - 79 */
29 	OPL3_CYMBAL_ON,    OPL3_CYMBAL_ON			/* 80 - 81 */
30 };
31 
32 struct snd_opl3_drum_voice {
33 	int voice;
34 	int op;
35 	unsigned char am_vib;
36 	unsigned char ksl_level;
37 	unsigned char attack_decay;
38 	unsigned char sustain_release;
39 	unsigned char feedback_connection;
40 	unsigned char wave_select;
41 };
42 
43 struct snd_opl3_drum_note {
44 	int voice;
45 	unsigned char fnum;
46 	unsigned char octave_f;
47 	unsigned char feedback_connection;
48 };
49 
50 static const struct snd_opl3_drum_voice bass_op0 = {6, 0, 0x00, 0x32, 0xf8, 0x66, 0x30, 0x00};
51 static const struct snd_opl3_drum_voice bass_op1 = {6, 1, 0x00, 0x03, 0xf6, 0x57, 0x30, 0x00};
52 static const struct snd_opl3_drum_note bass_note = {6, 0x90, 0x09};
53 
54 static const struct snd_opl3_drum_voice hihat = {7, 0, 0x00, 0x03, 0xf0, 0x06, 0x20, 0x00};
55 
56 static const struct snd_opl3_drum_voice snare = {7, 1, 0x00, 0x03, 0xf0, 0x07, 0x20, 0x02};
57 static const struct snd_opl3_drum_note snare_note = {7, 0xf4, 0x0d};
58 
59 static const struct snd_opl3_drum_voice tomtom = {8, 0, 0x02, 0x03, 0xf0, 0x06, 0x10, 0x00};
60 static const struct snd_opl3_drum_note tomtom_note = {8, 0xf4, 0x09};
61 
62 static const struct snd_opl3_drum_voice cymbal = {8, 1, 0x04, 0x03, 0xf0, 0x06, 0x10, 0x00};
63 
64 /*
65  * set drum voice characteristics
66  */
snd_opl3_drum_voice_set(struct snd_opl3 * opl3,const struct snd_opl3_drum_voice * data)67 static void snd_opl3_drum_voice_set(struct snd_opl3 *opl3,
68 				    const struct snd_opl3_drum_voice *data)
69 {
70 	unsigned char op_offset = snd_opl3_regmap[data->voice][data->op];
71 	unsigned char voice_offset = data->voice;
72 	unsigned short opl3_reg;
73 
74 	/* Set OPL3 AM_VIB register */
75 	opl3_reg = OPL3_LEFT | (OPL3_REG_AM_VIB + op_offset);
76 	opl3->command(opl3, opl3_reg, data->am_vib);
77 
78 	/* Set OPL3 KSL_LEVEL register */
79 	opl3_reg = OPL3_LEFT | (OPL3_REG_KSL_LEVEL + op_offset);
80 	opl3->command(opl3, opl3_reg, data->ksl_level);
81 
82 	/* Set OPL3 ATTACK_DECAY register */
83 	opl3_reg = OPL3_LEFT | (OPL3_REG_ATTACK_DECAY + op_offset);
84 	opl3->command(opl3, opl3_reg, data->attack_decay);
85 
86 	/* Set OPL3 SUSTAIN_RELEASE register */
87 	opl3_reg = OPL3_LEFT | (OPL3_REG_SUSTAIN_RELEASE + op_offset);
88 	opl3->command(opl3, opl3_reg, data->sustain_release);
89 
90 	/* Set OPL3 FEEDBACK_CONNECTION register */
91 	opl3_reg = OPL3_LEFT | (OPL3_REG_FEEDBACK_CONNECTION + voice_offset);
92 	opl3->command(opl3, opl3_reg, data->feedback_connection);
93 
94 	/* Select waveform */
95 	opl3_reg = OPL3_LEFT | (OPL3_REG_WAVE_SELECT + op_offset);
96 	opl3->command(opl3, opl3_reg, data->wave_select);
97 }
98 
99 /*
100  * Set drum voice pitch
101  */
snd_opl3_drum_note_set(struct snd_opl3 * opl3,const struct snd_opl3_drum_note * data)102 static void snd_opl3_drum_note_set(struct snd_opl3 *opl3,
103 				   const struct snd_opl3_drum_note *data)
104 {
105 	unsigned char voice_offset = data->voice;
106 	unsigned short opl3_reg;
107 
108 	/* Set OPL3 FNUM_LOW register */
109 	opl3_reg = OPL3_LEFT | (OPL3_REG_FNUM_LOW + voice_offset);
110 	opl3->command(opl3, opl3_reg, data->fnum);
111 
112 	/* Set OPL3 KEYON_BLOCK register */
113 	opl3_reg = OPL3_LEFT | (OPL3_REG_KEYON_BLOCK + voice_offset);
114 	opl3->command(opl3, opl3_reg, data->octave_f);
115 }
116 
117 /*
118  * Set drum voice volume and position
119  */
snd_opl3_drum_vol_set(struct snd_opl3 * opl3,const struct snd_opl3_drum_voice * data,int vel,struct snd_midi_channel * chan)120 static void snd_opl3_drum_vol_set(struct snd_opl3 *opl3,
121 				  const struct snd_opl3_drum_voice *data,
122 				  int vel, struct snd_midi_channel *chan)
123 {
124 	unsigned char op_offset = snd_opl3_regmap[data->voice][data->op];
125 	unsigned char voice_offset = data->voice;
126 	unsigned char reg_val;
127 	unsigned short opl3_reg;
128 
129 	/* Set OPL3 KSL_LEVEL register */
130 	reg_val = data->ksl_level;
131 	snd_opl3_calc_volume(&reg_val, vel, chan);
132 	opl3_reg = OPL3_LEFT | (OPL3_REG_KSL_LEVEL + op_offset);
133 	opl3->command(opl3, opl3_reg, reg_val);
134 
135 	/* Set OPL3 FEEDBACK_CONNECTION register */
136 	/* Set output voice connection */
137 	reg_val = data->feedback_connection | OPL3_STEREO_BITS;
138 	if (chan->gm_pan < 43)
139 		reg_val &= ~OPL3_VOICE_TO_RIGHT;
140 	if (chan->gm_pan > 85)
141 		reg_val &= ~OPL3_VOICE_TO_LEFT;
142 	opl3_reg = OPL3_LEFT | (OPL3_REG_FEEDBACK_CONNECTION + voice_offset);
143 	opl3->command(opl3, opl3_reg, reg_val);
144 }
145 
146 /*
147  * Loads drum voices at init time
148  */
snd_opl3_load_drums(struct snd_opl3 * opl3)149 void snd_opl3_load_drums(struct snd_opl3 *opl3)
150 {
151 	snd_opl3_drum_voice_set(opl3, &bass_op0);
152 	snd_opl3_drum_voice_set(opl3, &bass_op1);
153 	snd_opl3_drum_note_set(opl3, &bass_note);
154 
155 	snd_opl3_drum_voice_set(opl3, &hihat);
156 
157 	snd_opl3_drum_voice_set(opl3, &snare);
158 	snd_opl3_drum_note_set(opl3, &snare_note);
159 
160 	snd_opl3_drum_voice_set(opl3, &tomtom);
161 	snd_opl3_drum_note_set(opl3, &tomtom_note);
162 
163 	snd_opl3_drum_voice_set(opl3, &cymbal);
164 }
165 
166 /*
167  * Switch drum voice on or off
168  */
snd_opl3_drum_switch(struct snd_opl3 * opl3,int note,int vel,int on_off,struct snd_midi_channel * chan)169 void snd_opl3_drum_switch(struct snd_opl3 *opl3, int note, int vel, int on_off,
170 			  struct snd_midi_channel *chan)
171 {
172 	unsigned char drum_mask;
173 	const struct snd_opl3_drum_voice *drum_voice;
174 
175 	if (!(opl3->drum_reg & OPL3_PERCUSSION_ENABLE))
176 		return;
177 
178 	if ((note < 35) || (note > 81))
179 		return;
180 	drum_mask = snd_opl3_drum_table[note - 35];
181 
182 	if (on_off) {
183 		switch (drum_mask) {
184 		case OPL3_BASSDRUM_ON:
185 			drum_voice = &bass_op1;
186 			break;
187 		case OPL3_HIHAT_ON:
188 			drum_voice = &hihat;
189 			break;
190 		case OPL3_SNAREDRUM_ON:
191 			drum_voice = &snare;
192 			break;
193 		case OPL3_TOMTOM_ON:
194 			drum_voice = &tomtom;
195 			break;
196 		case OPL3_CYMBAL_ON:
197 			drum_voice = &cymbal;
198 			break;
199 		default:
200 			drum_voice = &tomtom;
201 		}
202 
203 		snd_opl3_drum_vol_set(opl3, drum_voice, vel, chan);
204 		opl3->drum_reg |= drum_mask;
205 	} else {
206 		opl3->drum_reg &= ~drum_mask;
207 	}
208 	opl3->command(opl3, OPL3_LEFT | OPL3_REG_PERCUSSION,
209 			 opl3->drum_reg);
210 }
211