xref: /openbmc/linux/include/sound/seq_midi_emul.h (revision 0e17c50f)
1 /* SPDX-License-Identifier: GPL-2.0-or-later */
2 #ifndef __SOUND_SEQ_MIDI_EMUL_H
3 #define __SOUND_SEQ_MIDI_EMUL_H
4 
5 /*
6  *  Midi channel definition for optional channel management.
7  *
8  *  Copyright (C) 1999 Steve Ratcliffe
9  */
10 
11 #include <sound/seq_kernel.h>
12 
13 /*
14  * This structure is used to keep track of the current state on each
15  * channel.  All drivers for hardware that does not understand midi
16  * directly will probably need to use this structure.
17  */
18 struct snd_midi_channel {
19 	void *private;		/* A back pointer to driver data */
20 	int  number;		/* The channel number */
21 	int  client;		/* The client associated with this channel */
22 	int  port;		/* The port associated with this channel */
23 
24 	unsigned char midi_mode;	/* GM, GS, XG etc */
25 	unsigned int
26 		drum_channel:1,		/* Drum channel */
27 		param_type:1		/* RPN/NRPN */
28 		;
29 
30 	unsigned char midi_aftertouch;	/* Aftertouch (key pressure) */
31 	unsigned char midi_pressure;	/* Channel pressure */
32 	unsigned char midi_program;	/* Instrument number */
33 	short midi_pitchbend;		/* Pitch bend amount */
34 
35 	unsigned char control[128];	/* Current value of all controls */
36 	unsigned char note[128];	/* Current status for all notes */
37 
38 	short gm_rpn_pitch_bend_range;	/* Pitch bend range */
39 	short gm_rpn_fine_tuning; 	/* Master fine tuning */
40 	short gm_rpn_coarse_tuning;	/* Master coarse tuning */
41 
42 };
43 
44 /*
45  * A structure that represets a set of channels bound to a port.  There
46  * would usually be 16 channels per port.  But fewer could be used for
47  * particular cases.
48  * The channel set consists of information describing the client and
49  * port for this midi synth and an array of snd_midi_channel structures.
50  * A driver that had no need for snd_midi_channel could still use the
51  * channel set type if it wished with the channel array null.
52  */
53 struct snd_midi_channel_set {
54 	void *private_data;		/* Driver data */
55 	int  client;			/* Client for this port */
56 	int  port;			/* The port number */
57 
58 	int  max_channels;		/* Size of the channels array */
59 	struct snd_midi_channel *channels;
60 
61 	unsigned char midi_mode;	/* MIDI operating mode */
62 	unsigned char gs_master_volume;	/* SYSEX master volume: 0-127 */
63 	unsigned char gs_chorus_mode;
64 	unsigned char gs_reverb_mode;
65 
66 };
67 
68 struct snd_midi_op {
69 	void (*note_on)(void *private_data, int note, int vel, struct snd_midi_channel *chan);
70 	void (*note_off)(void *private_data,int note, int vel, struct snd_midi_channel *chan); /* release note */
71 	void (*key_press)(void *private_data, int note, int vel, struct snd_midi_channel *chan);
72 	void (*note_terminate)(void *private_data, int note, struct snd_midi_channel *chan); /* terminate note immediately */
73 	void (*control)(void *private_data, int type, struct snd_midi_channel *chan);
74 	void (*nrpn)(void *private_data, struct snd_midi_channel *chan,
75 		     struct snd_midi_channel_set *chset);
76 	void (*sysex)(void *private_data, unsigned char *buf, int len, int parsed,
77 		      struct snd_midi_channel_set *chset);
78 };
79 
80 /*
81  * These defines are used so that pitchbend, aftertouch etc, can be
82  * distinguished from controller values.
83  */
84 /* 0-127 controller values */
85 #define MIDI_CTL_PITCHBEND	0x80
86 #define MIDI_CTL_AFTERTOUCH	0x81
87 #define MIDI_CTL_CHAN_PRESSURE	0x82
88 
89 /*
90  * These names exist to allow symbolic access to the controls array.
91  * The usage is eg: chan->gm_bank_select.  Another implementation would
92  * be really have these members in the struct, and not the array.
93  */
94 #define gm_bank_select		control[0]
95 #define gm_modulation		control[1]
96 #define gm_breath		control[2]
97 #define gm_foot_pedal		control[4]
98 #define gm_portamento_time	control[5]
99 #define gm_data_entry		control[6]
100 #define gm_volume		control[7]
101 #define gm_balance		control[8]
102 #define gm_pan			control[10]
103 #define gm_expression		control[11]
104 #define gm_effect_control1	control[12]
105 #define gm_effect_control2	control[13]
106 #define gm_slider1		control[16]
107 #define gm_slider2		control[17]
108 #define gm_slider3		control[18]
109 #define gm_slider4		control[19]
110 
111 #define gm_bank_select_lsb	control[32]
112 #define gm_modulation_wheel_lsb	control[33]
113 #define gm_breath_lsb		control[34]
114 #define gm_foot_pedal_lsb	control[36]
115 #define gm_portamento_time_lsb	control[37]
116 #define gm_data_entry_lsb	control[38]
117 #define gm_volume_lsb		control[39]
118 #define gm_balance_lsb		control[40]
119 #define gm_pan_lsb		control[42]
120 #define gm_expression_lsb	control[43]
121 #define gm_effect_control1_lsb	control[44]
122 #define gm_effect_control2_lsb	control[45]
123 
124 #define gm_sustain	 	control[MIDI_CTL_SUSTAIN]
125 #define gm_hold			gm_sustain
126 #define gm_portamento		control[MIDI_CTL_PORTAMENTO]
127 #define gm_sostenuto		control[MIDI_CTL_SOSTENUTO]
128 
129 /*
130  * These macros give the complete value of the controls that consist
131  * of coarse and fine pairs.  Of course the fine controls are seldom used
132  * but there is no harm in being complete.
133  */
134 #define SNDRV_GM_BANK_SELECT(cp)		(((cp)->control[0]<<7)|((cp)->control[32]))
135 #define SNDRV_GM_MODULATION_WHEEL(cp)	(((cp)->control[1]<<7)|((cp)->control[33]))
136 #define SNDRV_GM_BREATH(cp)		(((cp)->control[2]<<7)|((cp)->control[34]))
137 #define SNDRV_GM_FOOT_PEDAL(cp)		(((cp)->control[4]<<7)|((cp)->control[36]))
138 #define SNDRV_GM_PORTAMENTO_TIME(cp)	(((cp)->control[5]<<7)|((cp)->control[37]))
139 #define SNDRV_GM_DATA_ENTRY(cp)		(((cp)->control[6]<<7)|((cp)->control[38]))
140 #define SNDRV_GM_VOLUME(cp)		(((cp)->control[7]<<7)|((cp)->control[39]))
141 #define SNDRV_GM_BALANCE(cp)		(((cp)->control[8]<<7)|((cp)->control[40]))
142 #define SNDRV_GM_PAN(cp)			(((cp)->control[10]<<7)|((cp)->control[42]))
143 #define SNDRV_GM_EXPRESSION(cp)		(((cp)->control[11]<<7)|((cp)->control[43]))
144 
145 
146 /* MIDI mode */
147 #define SNDRV_MIDI_MODE_NONE	0	/* Generic midi */
148 #define SNDRV_MIDI_MODE_GM	1
149 #define SNDRV_MIDI_MODE_GS	2
150 #define SNDRV_MIDI_MODE_XG	3
151 #define SNDRV_MIDI_MODE_MT32	4
152 
153 /* MIDI note state */
154 #define SNDRV_MIDI_NOTE_OFF		0x00
155 #define SNDRV_MIDI_NOTE_ON		0x01
156 #define SNDRV_MIDI_NOTE_RELEASED		0x02
157 #define SNDRV_MIDI_NOTE_SOSTENUTO		0x04
158 
159 #define SNDRV_MIDI_PARAM_TYPE_REGISTERED		0
160 #define SNDRV_MIDI_PARAM_TYPE_NONREGISTERED	1
161 
162 /* SYSEX parse flag */
163 enum {
164 	SNDRV_MIDI_SYSEX_NOT_PARSED = 0,
165 	SNDRV_MIDI_SYSEX_GM_ON,
166 	SNDRV_MIDI_SYSEX_GS_ON,
167 	SNDRV_MIDI_SYSEX_GS_RESET,
168 	SNDRV_MIDI_SYSEX_GS_CHORUS_MODE,
169 	SNDRV_MIDI_SYSEX_GS_REVERB_MODE,
170 	SNDRV_MIDI_SYSEX_GS_MASTER_VOLUME,
171 	SNDRV_MIDI_SYSEX_GS_PROGRAM,
172 	SNDRV_MIDI_SYSEX_GS_DRUM_CHANNEL,
173 	SNDRV_MIDI_SYSEX_XG_ON,
174 };
175 
176 /* Prototypes for midi_process.c */
177 void snd_midi_process_event(const struct snd_midi_op *ops,
178 			    struct snd_seq_event *ev,
179 			    struct snd_midi_channel_set *chanset);
180 void snd_midi_channel_set_clear(struct snd_midi_channel_set *chset);
181 struct snd_midi_channel_set *snd_midi_channel_alloc_set(int n);
182 void snd_midi_channel_free_set(struct snd_midi_channel_set *chset);
183 
184 #endif /* __SOUND_SEQ_MIDI_EMUL_H */
185