linux/sound/core/seq/oss/seq_oss_timer.c

// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * OSS compatible sequencer driver
 *
 * Timer control routines
 *
 * Copyright (C) 1998,99 Takashi Iwai <[email protected]>
 */

#include "seq_oss_timer.h"
#include "seq_oss_event.h"
#include <sound/seq_oss_legacy.h>
#include <linux/slab.h>

/*
 */
#define MIN_OSS_TEMPO …
#define MAX_OSS_TEMPO …
#define MIN_OSS_TIMEBASE …
#define MAX_OSS_TIMEBASE …

/*
 */
static void calc_alsa_tempo(struct seq_oss_timer *timer);
static int send_timer_event(struct seq_oss_devinfo *dp, int type, int value);


/*
 * create and register a new timer.
 * if queue is not started yet, start it.
 */
struct seq_oss_timer *
snd_seq_oss_timer_new(struct seq_oss_devinfo *dp)
{ … }


/*
 * delete timer.
 * if no more timer exists, stop the queue.
 */
void
snd_seq_oss_timer_delete(struct seq_oss_timer *rec)
{ … }


/*
 * process one timing event
 * return 1 : event proceseed -- skip this event
 *        0 : not a timer event -- enqueue this event
 */
int
snd_seq_oss_process_timer_event(struct seq_oss_timer *rec, union evrec *ev)
{ … }


/*
 * convert tempo units
 */
static void
calc_alsa_tempo(struct seq_oss_timer *timer)
{ … }


/*
 * dispatch a timer event
 */
static int
send_timer_event(struct seq_oss_devinfo *dp, int type, int value)
{ … }

/*
 * set queue tempo and start queue
 */
int
snd_seq_oss_timer_start(struct seq_oss_timer *timer)
{ … }


/*
 * stop queue
 */
int
snd_seq_oss_timer_stop(struct seq_oss_timer *timer)
{ … }


/*
 * continue queue
 */
int
snd_seq_oss_timer_continue(struct seq_oss_timer *timer)
{ … }


/*
 * change queue tempo
 */
int
snd_seq_oss_timer_tempo(struct seq_oss_timer *timer, int value)
{ … }


/*
 * ioctls
 */
int
snd_seq_oss_timer_ioctl(struct seq_oss_timer *timer, unsigned int cmd, int __user *arg)
{ … }