linux/sound/pci/emu10k1/emu10k1_callback.c

// SPDX-License-Identifier: GPL-2.0-or-later
/*
 *  synth callback routines for Emu10k1
 *
 *  Copyright (C) 2000 Takashi Iwai <[email protected]>
 */

#include <linux/export.h>
#include "emu10k1_synth_local.h"
#include <sound/asoundef.h>

/* voice status */
enum { … };

/* Keeps track of what we are finding */
struct best_voice { … };

/*
 * prototypes
 */
static void lookup_voices(struct snd_emux *emux, struct snd_emu10k1 *hw,
			  struct best_voice *best, int active_only);
static struct snd_emux_voice *get_voice(struct snd_emux *emux,
					struct snd_emux_port *port);
static int start_voice(struct snd_emux_voice *vp);
static void trigger_voice(struct snd_emux_voice *vp);
static void release_voice(struct snd_emux_voice *vp);
static void update_voice(struct snd_emux_voice *vp, int update);
static void terminate_voice(struct snd_emux_voice *vp);
static void free_voice(struct snd_emux_voice *vp);
static u32 make_fmmod(struct snd_emux_voice *vp);
static u32 make_fm2frq2(struct snd_emux_voice *vp);
static int get_pitch_shift(struct snd_emux *emu);

/*
 * Ensure a value is between two points
 * macro evaluates its args more than once, so changed to upper-case.
 */
#define LIMITVALUE(x, a, b) …
#define LIMITMAX(x, a) …


/*
 * set up operators
 */
static const struct snd_emux_operators emu10k1_ops = …;

void
snd_emu10k1_ops_setup(struct snd_emux *emux)
{ … }


/*
 * get more voice for pcm
 *
 * terminate most inactive voice and give it as a pcm voice.
 *
 * voice_lock is already held.
 */
int
snd_emu10k1_synth_get_voice(struct snd_emu10k1 *hw)
{ … }


/*
 * turn off the voice (not terminated)
 */
static void
release_voice(struct snd_emux_voice *vp)
{ … }


/*
 * terminate the voice
 */
static void
terminate_voice(struct snd_emux_voice *vp)
{ … }

/*
 * release the voice to system
 */
static void
free_voice(struct snd_emux_voice *vp)
{ … }


/*
 * update registers
 */
static void
update_voice(struct snd_emux_voice *vp, int update)
{ … }


/*
 * look up voice table - get the best voice in order of preference
 */
/* spinlock held! */
static void
lookup_voices(struct snd_emux *emu, struct snd_emu10k1 *hw,
	      struct best_voice *best, int active_only)
{ … }

/*
 * get an empty voice
 *
 * emu->voice_lock is already held.
 */
static struct snd_emux_voice *
get_voice(struct snd_emux *emu, struct snd_emux_port *port)
{ … }

/*
 * prepare envelopes and LFOs
 */
static int
start_voice(struct snd_emux_voice *vp)
{ … }

/*
 * Start envelope
 */
static void
trigger_voice(struct snd_emux_voice *vp)
{ … }

#define MOD_SENSE …

/* calculate lfo1 modulation height and cutoff register */
static u32
make_fmmod(struct snd_emux_voice *vp)
{ … }

/* calculate set lfo2 pitch & frequency register */
static u32
make_fm2frq2(struct snd_emux_voice *vp)
{ … }

static int get_pitch_shift(struct snd_emux *emu)
{ … }