// SPDX-License-Identifier: GPL-2.0-or-later /* * GM/GS/XG midi module. * * Copyright (C) 1999 Steve Ratcliffe * * Based on awe_wave.c by Takashi Iwai */ /* * This module is used to keep track of the current midi state. * It can be used for drivers that are required to emulate midi when * the hardware doesn't. * * It was written for a AWE64 driver, but there should be no AWE specific * code in here. If there is it should be reported as a bug. */ #include <linux/init.h> #include <linux/slab.h> #include <linux/string.h> #include <linux/module.h> #include <sound/core.h> #include <sound/seq_kernel.h> #include <sound/seq_midi_emul.h> #include <sound/initval.h> #include <sound/asoundef.h> MODULE_AUTHOR(…) …; MODULE_DESCRIPTION(…) …; MODULE_LICENSE(…) …; /* Prototypes for static functions */ static void note_off(const struct snd_midi_op *ops, void *drv, struct snd_midi_channel *chan, int note, int vel); static void do_control(const struct snd_midi_op *ops, void *private, struct snd_midi_channel_set *chset, struct snd_midi_channel *chan, int control, int value); static void rpn(const struct snd_midi_op *ops, void *drv, struct snd_midi_channel *chan, struct snd_midi_channel_set *chset); static void nrpn(const struct snd_midi_op *ops, void *drv, struct snd_midi_channel *chan, struct snd_midi_channel_set *chset); static void sysex(const struct snd_midi_op *ops, void *private, unsigned char *sysex, int len, struct snd_midi_channel_set *chset); static void all_sounds_off(const struct snd_midi_op *ops, void *private, struct snd_midi_channel *chan); static void all_notes_off(const struct snd_midi_op *ops, void *private, struct snd_midi_channel *chan); static void snd_midi_reset_controllers(struct snd_midi_channel *chan); static void reset_all_channels(struct snd_midi_channel_set *chset); /* * Process an event in a driver independent way. This means dealing * with RPN, NRPN, SysEx etc that are defined for common midi applications * such as GM, GS and XG. * There modes that this module will run in are: * Generic MIDI - no interpretation at all, it will just save current values * of controllers etc. * GM - You can use all gm_ prefixed elements of chan. Controls, RPN, NRPN, * SysEx will be interpreded as defined in General Midi. * GS - You can use all gs_ prefixed elements of chan. Codes for GS will be * interpreted. * XG - You can use all xg_ prefixed elements of chan. Codes for XG will * be interpreted. */ void snd_midi_process_event(const struct snd_midi_op *ops, struct snd_seq_event *ev, struct snd_midi_channel_set *chanset) { … } EXPORT_SYMBOL(…); /* * release note */ static void note_off(const struct snd_midi_op *ops, void *drv, struct snd_midi_channel *chan, int note, int vel) { … } /* * Do all driver independent operations for this controller and pass * events that need to take place immediately to the driver. */ static void do_control(const struct snd_midi_op *ops, void *drv, struct snd_midi_channel_set *chset, struct snd_midi_channel *chan, int control, int value) { … } /* * initialize the MIDI status */ void snd_midi_channel_set_clear(struct snd_midi_channel_set *chset) { … } EXPORT_SYMBOL(…); /* * Process a rpn message. */ static void rpn(const struct snd_midi_op *ops, void *drv, struct snd_midi_channel *chan, struct snd_midi_channel_set *chset) { … } /* * Process an nrpn message. */ static void nrpn(const struct snd_midi_op *ops, void *drv, struct snd_midi_channel *chan, struct snd_midi_channel_set *chset) { … } /* * convert channel parameter in GS sysex */ static int get_channel(unsigned char cmd) { … } /* * Process a sysex message. */ static void sysex(const struct snd_midi_op *ops, void *private, unsigned char *buf, int len, struct snd_midi_channel_set *chset) { … } /* * all sound off */ static void all_sounds_off(const struct snd_midi_op *ops, void *drv, struct snd_midi_channel *chan) { … } /* * all notes off */ static void all_notes_off(const struct snd_midi_op *ops, void *drv, struct snd_midi_channel *chan) { … } /* * Initialise a single midi channel control block. */ static void snd_midi_channel_init(struct snd_midi_channel *p, int n) { … } /* * Allocate and initialise a set of midi channel control blocks. */ static struct snd_midi_channel *snd_midi_channel_init_set(int n) { … } /* * reset all midi channels */ static void reset_all_channels(struct snd_midi_channel_set *chset) { … } /* * Allocate and initialise a midi channel set. */ struct snd_midi_channel_set *snd_midi_channel_alloc_set(int n) { … } EXPORT_SYMBOL(…); /* * Reset the midi controllers on a particular channel to default values. */ static void snd_midi_reset_controllers(struct snd_midi_channel *chan) { … } /* * Free a midi channel set. */ void snd_midi_channel_free_set(struct snd_midi_channel_set *chset) { … } EXPORT_SYMBOL(…);
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