linux/sound/drivers/pcsp/pcsp.h

/* SPDX-License-Identifier: GPL-2.0 */
/*
 * PC-Speaker driver for Linux
 *
 * Copyright (C) 1993-1997  Michael Beck
 * Copyright (C) 1997-2001  David Woodhouse
 * Copyright (C) 2001-2008  Stas Sergeev
 */

#ifndef __PCSP_H__
#define __PCSP_H__

#include <linux/hrtimer.h>
#include <linux/i8253.h>
#include <linux/timex.h>

#define PCSP_SOUND_VERSION …
#define PCSP_DEBUG …

/* default timer freq for PC-Speaker: 18643 Hz */
#define DIV_18KHZ …
#define MAX_DIV …
#define CALC_DIV(d) …
#define CUR_DIV() …
#define PCSP_MAX_TREBLE …

/* unfortunately, with hrtimers 37KHz does not work very well :( */
#define PCSP_DEFAULT_TREBLE …
#define MIN_DIV …

/* wild guess */
#define PCSP_MIN_LPJ …
#define PCSP_DEFAULT_SDIV …
#define PCSP_DEFAULT_SRATE …
#define PCSP_INDEX_INC() …
#define PCSP_CALC_RATE(i) …
#define PCSP_RATE() …
#define PCSP_MIN_RATE__1 …
#define PCSP_MAX_RATE__1 …
#define PCSP_MAX_PERIOD_NS …
#define PCSP_MIN_PERIOD_NS …
#define PCSP_CALC_NS(div) …
#define PCSP_PERIOD_NS() …

#define PCSP_MAX_PERIOD_SIZE …
#define PCSP_MAX_PERIODS …
#define PCSP_BUFFER_SIZE …

struct snd_pcsp { … };

extern struct snd_pcsp pcsp_chip;

extern enum hrtimer_restart pcsp_do_timer(struct hrtimer *handle);
extern void pcsp_sync_stop(struct snd_pcsp *chip);

extern int snd_pcsp_new_pcm(struct snd_pcsp *chip);
extern int snd_pcsp_new_mixer(struct snd_pcsp *chip, int nopcm);

#endif