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/* SPDX-License-Identifier: GPL-2.0-or-later */
/* SPDX-FileCopyrightText: © 2021 Ahmad Fatoum */
#ifndef __SOUND_H_
#define __SOUND_H_
#include <linux/list.h>
#include <poller.h>
#define BELL_DEFAULT_FREQUENCY -1
struct sound_card {
const char *name;
int bell_frequency;
int (*beep)(struct sound_card *, unsigned freq, unsigned us);
/* private */
struct list_head list;
struct list_head tune;
struct poller_async poller;
};
int sound_card_register(struct sound_card *card);
int sound_card_beep_wait(struct sound_card *card, unsigned timeout_us);
int sound_card_beep(struct sound_card *card, int freq, unsigned int us);
int sound_card_beep_cancel(struct sound_card *card);
struct sound_card *sound_card_get_default(void);
static inline int beep(int freq, unsigned us)
{
return sound_card_beep(sound_card_get_default(), freq, us);
}
static inline int beep_wait(unsigned timeout_us)
{
return sound_card_beep_wait(sound_card_get_default(), timeout_us);
}
static inline int beep_cancel(void)
{
return sound_card_beep_cancel(sound_card_get_default());
}
/*
* Synthesizers all have the same prototype, but their implementation
* is replaced with a gain-adjusted square wave if CONFIG_SYNTH_SQUARES=y.
* This is to support PCM beeping on systems, where sine generation may
* spend to much time in the poller.
*/
typedef void synth_t(unsigned freq, s16 amplitude, s16 *stream,
unsigned sample_rate, unsigned nsamples);
#ifdef CONFIG_SYNTH_SQUARES
#define SYNTH(fn, volume_percent) \
static inline void fn(unsigned f, s16 amplitude, s16 *s, \
unsigned r, unsigned n) { \
synth_t __synth_square; \
amplitude = amplitude * volume_percent / 100; \
__synth_square(f, amplitude, s, r, n); \
} \
synth_t __##fn
#else
#define SYNTH(fn, volume_percent) \
static inline void fn(unsigned f, s16 a, s16 *s, \
unsigned r, unsigned n) { \
synth_t __##fn; \
__##fn(f, a, s, r, n); \
} \
synth_t __##fn
#endif
SYNTH(synth_square, 100); /* square wave always has full amplitude */
SYNTH(synth_sin, 64); /* ∫₀¹ sin(πx) dx ≈ 64% */
#endif
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