// SPDX-License-Identifier: GPL-2.0-or-later
/*
* OSS compatible sequencer driver
*
* Timer control routines
*
* Copyright (C) 1998,99 Takashi Iwai <tiwai@suse.de>
*/
#include "seq_oss_timer.h"
#include "seq_oss_event.h"
#include <sound/seq_oss_legacy.h>
#include <linux/slab.h>
/*
*/
#define MIN_OSS_TEMPO 8
#define MAX_OSS_TEMPO 360
#define MIN_OSS_TIMEBASE 1
#define MAX_OSS_TIMEBASE 1000
/*
*/
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)
{
struct seq_oss_timer *rec;
rec = kzalloc(sizeof(*rec), GFP_KERNEL);
if (rec == NULL)
return NULL;
rec->dp = dp;
rec->cur_tick = 0;
rec->realtime = 0;
rec->running = 0;
rec->oss_tempo = 60;
rec->oss_timebase = 100;
calc_alsa_tempo(rec);
return rec;
}
/*
* delete timer.
* if no more timer exists, stop the queue.
*/
void
snd_seq_oss_timer_delete(struct seq_oss_timer *rec)
{
if (rec) {
snd_seq_oss_timer_stop(rec);
kfree(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)
{
abstime_t parm = ev->t.time;
if (ev->t.code == EV_TIMING) {
switch (ev->t.cmd) {
case TMR_WAIT_REL:
parm += rec->cur_tick;
rec->realtime = 0;
fallthrough;
case TMR_WAIT_ABS:
if (parm == 0) {
rec->realtime = 1;
} else if (parm >= rec->cur_tick) {
rec->realtime = 0;
rec->cur_tick = parm;
}
return 1; /* skip this event */
case TMR_START:
snd_seq_oss_timer_start(rec);
return 1;
}
} else if (ev->s.code == SEQ_WAIT) {
/* time = from 1 to 3 bytes */
parm = (ev->echo >> 8) & 0xffffff;
if (parm > rec->cur_tick) {
/* set next event time */
rec->cur_tick = parm;
rec->realtime = 0;
}
return 1;
}
return 0;
}
/*
* convert tempo units
*/
static void
calc_alsa_tempo(struct seq_oss_timer *timer)
{
timer->tempo = (60 * 1000000) / timer->oss_tempo;
timer->ppq = timer->oss_timebase;
}
/*
* dispatch a timer event
*/
static int
send_timer_event(struct seq_oss_devinfo *dp, int type, int value)
{
struct snd_seq_event ev;
memset(&ev, 0, sizeof(ev));
ev.type = type;
ev.source.client = dp->cseq;
ev.source.port = 0;
ev.dest.client = SNDRV_SEQ_CLIENT_SYSTEM;
ev.dest.port = SNDRV_SEQ_PORT_SYSTEM_TIMER;
ev.queue = dp->queue;
ev.data.queue.queue = dp->queue;
ev.data.queue.param.value = value;
return snd_seq_kernel_client_dispatch(dp->cseq, &ev, 1, 0);
}
/*
* set queue tempo and start queue
*/
int
snd_seq_oss_timer_start(struct seq_oss_timer *timer)
{
struct seq_oss_devinfo *dp = timer->dp;
struct snd_seq_queue_tempo tmprec;
if (timer->running)
snd_seq_oss_timer_stop(timer);
memset(&tmprec, 0, sizeof(tmprec));
tmprec.queue = dp->queue;
tmprec.ppq = timer->ppq;
tmprec.tempo = timer->tempo;
snd_seq_set_queue_tempo(dp->cseq, &tmprec);
send_timer_event(dp, SNDRV_SEQ_EVENT_START, 0);
timer->running = 1;
timer->cur_tick = 0;
return 0;
}
/*
* stop queue
*/
int
snd_seq_oss_timer_stop(struct seq_oss_timer *timer)
{
if (! timer->running)
return 0;
send_timer_event(timer->dp, SNDRV_SEQ_EVENT_STOP, 0);
timer->running = 0;
return 0;
}
/*
* continue queue
*/
int
snd_seq_oss_timer_continue(struct seq_oss_timer *timer)
{
if (timer->running)
return 0;
send_timer_event(timer->dp, SNDRV_SEQ_EVENT_CONTINUE, 0);
timer->running = 1;
return 0;
}
/*
* change queue tempo
*/
int
snd_seq_oss_timer_tempo(struct seq_oss_timer *timer, int value)
{
if (value < MIN_OSS_TEMPO)
value = MIN_OSS_TEMPO;
else if (value > MAX_OSS_TEMPO)
value = MAX_OSS_TEMPO;
timer->oss_tempo = value;
calc_alsa_tempo(timer);
if (timer->running)
send_timer_event(timer->dp, SNDRV_SEQ_EVENT_TEMPO, timer->tempo);
return 0;
}
/*
* ioctls
*/
int
snd_seq_oss_timer_ioctl(struct seq_oss_timer *timer, unsigned int cmd, int __user *arg)
{
int value;
if (cmd == SNDCTL_SEQ_CTRLRATE) {
/* if *arg == 0, just return the current rate */
if (get_user(value, arg))
return -EFAULT;
if (value)
return -EINVAL;
value = ((timer->oss_tempo * timer->oss_timebase) + 30) / 60;
return put_user(value, arg) ? -EFAULT : 0;
}
if (timer->dp->seq_mode == SNDRV_SEQ_OSS_MODE_SYNTH)
return 0;
switch (cmd) {
case SNDCTL_TMR_START:
return snd_seq_oss_timer_start(timer);
case SNDCTL_TMR_STOP:
return snd_seq_oss_timer_stop(timer);
case SNDCTL_TMR_CONTINUE:
return snd_seq_oss_timer_continue(timer);
case SNDCTL_TMR_TEMPO:
if (get_user(value, arg))
return -EFAULT;
return snd_seq_oss_timer_tempo(timer, value);
case SNDCTL_TMR_TIMEBASE:
if (get_user(value, arg))
return -EFAULT;
if (value < MIN_OSS_TIMEBASE)
value = MIN_OSS_TIMEBASE;
else if (value > MAX_OSS_TIMEBASE)
value = MAX_OSS_TIMEBASE;
timer->oss_timebase = value;
calc_alsa_tempo(timer);
return 0;
case SNDCTL_TMR_METRONOME:
case SNDCTL_TMR_SELECT:
case SNDCTL_TMR_SOURCE:
/* not supported */
return 0;
}
return 0;
}