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|
/*
* ALSA sequencer Timer
* Copyright (c) 1998-1999 by Frank van de Pol <fvdpol@coil.demon.nl>
* Jaroslav Kysela <perex@suse.cz>
*
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
*/
#include <sound/driver.h>
#include <sound/core.h>
#include <linux/slab.h>
#include "seq_timer.h"
#include "seq_queue.h"
#include "seq_info.h"
extern int seq_default_timer_class;
extern int seq_default_timer_sclass;
extern int seq_default_timer_card;
extern int seq_default_timer_device;
extern int seq_default_timer_subdevice;
extern int seq_default_timer_resolution;
/* allowed sequencer timer frequencies, in Hz */
#define MIN_FREQUENCY 10
#define MAX_FREQUENCY 6250
#define DEFAULT_FREQUENCY 1000
#define SKEW_BASE 0x10000 /* 16bit shift */
static void snd_seq_timer_set_tick_resolution(struct snd_seq_timer_tick *tick,
int tempo, int ppq)
{
if (tempo < 1000000)
tick->resolution = (tempo * 1000) / ppq;
else {
/* might overflow.. */
unsigned int s;
s = tempo % ppq;
s = (s * 1000) / ppq;
tick->resolution = (tempo / ppq) * 1000;
tick->resolution += s;
}
if (tick->resolution <= 0)
tick->resolution = 1;
snd_seq_timer_update_tick(tick, 0);
}
/* create new timer (constructor) */
struct snd_seq_timer *snd_seq_timer_new(void)
{
struct snd_seq_timer *tmr;
tmr = kzalloc(sizeof(*tmr), GFP_KERNEL);
if (tmr == NULL) {
snd_printd("malloc failed for snd_seq_timer_new() \n");
return NULL;
}
spin_lock_init(&tmr->lock);
/* reset setup to defaults */
snd_seq_timer_defaults(tmr);
/* reset time */
snd_seq_timer_reset(tmr);
return tmr;
}
/* delete timer (destructor) */
void snd_seq_timer_delete(struct snd_seq_timer **tmr)
{
struct snd_seq_timer *t = *tmr;
*tmr = NULL;
if (t == NULL) {
snd_printd("oops: snd_seq_timer_delete() called with NULL timer\n");
return;
}
t->running = 0;
/* reset time */
snd_seq_timer_stop(t);
snd_seq_timer_reset(t);
kfree(t);
}
void snd_seq_timer_defaults(struct snd_seq_timer * tmr)
{
/* setup defaults */
tmr->ppq = 96; /* 96 PPQ */
tmr->tempo = 500000; /* 120 BPM */
snd_seq_timer_set_tick_resolution(&tmr->tick, tmr->tempo, tmr->ppq);
tmr->running = 0;
tmr->type = SNDRV_SEQ_TIMER_ALSA;
tmr->alsa_id.dev_class = seq_default_timer_class;
tmr->alsa_id.dev_sclass = seq_default_timer_sclass;
tmr->alsa_id.card = seq_default_timer_card;
tmr->alsa_id.device = seq_default_timer_device;
tmr->alsa_id.subdevice = seq_default_timer_subdevice;
tmr->preferred_resolution = seq_default_timer_resolution;
tmr->skew = tmr->skew_base = SKEW_BASE;
}
void snd_seq_timer_reset(struct snd_seq_timer * tmr)
{
unsigned long flags;
spin_lock_irqsave(&tmr->lock, flags);
/* reset time & songposition */
tmr->cur_time.tv_sec = 0;
tmr->cur_time.tv_nsec = 0;
tmr->tick.cur_tick = 0;
tmr->tick.fraction = 0;
spin_unlock_irqrestore(&tmr->lock, flags);
}
/* called by timer interrupt routine. the period time since previous invocation is passed */
static void snd_seq_timer_interrupt(struct snd_timer_instance *timeri,
unsigned long resolution,
unsigned long ticks)
{
unsigned long flags;
struct snd_seq_queue *q = timeri->callback_data;
struct snd_seq_timer *tmr;
if (q == NULL)
return;
tmr = q->timer;
if (tmr == NULL)
return;
if (!tmr->running)
return;
resolution *= ticks;
if (tmr->skew != tmr->skew_base) {
/* FIXME: assuming skew_base = 0x10000 */
resolution = (resolution >> 16) * tmr->skew +
(((resolution & 0xffff) * tmr->skew) >> 16);
}
spin_lock_irqsave(&tmr->lock, flags);
/* update timer */
snd_seq_inc_time_nsec(&tmr->cur_time, resolution);
/* calculate current tick */
snd_seq_timer_update_tick(&tmr->tick, resolution);
/* register actual time of this timer update */
do_gettimeofday(&tmr->last_update);
spin_unlock_irqrestore(&tmr->lock, flags);
/* check queues and dispatch events */
snd_seq_check_queue(q, 1, 0);
}
/* set current tempo */
int snd_seq_timer_set_tempo(struct snd_seq_timer * tmr, int tempo)
{
unsigned long flags;
snd_assert(tmr, return -EINVAL);
if (tempo <= 0)
return -EINVAL;
spin_lock_irqsave(&tmr->lock, flags);
if ((unsigned int)tempo != tmr->tempo) {
tmr->tempo = tempo;
snd_seq_timer_set_tick_resolution(&tmr->tick, tmr->tempo, tmr->ppq);
}
spin_unlock_irqrestore(&tmr->lock, flags);
return 0;
}
/* set current ppq */
int snd_seq_timer_set_ppq(struct snd_seq_timer * tmr, int ppq)
{
unsigned long flags;
snd_assert(tmr, return -EINVAL);
if (ppq <= 0)
return -EINVAL;
spin_lock_irqsave(&tmr->lock, flags);
if (tmr->running && (ppq != tmr->ppq)) {
/* refuse to change ppq on running timers */
/* because it will upset the song position (ticks) */
spin_unlock_irqrestore(&tmr->lock, flags);
snd_printd("seq: cannot change ppq of a running timer\n");
return -EBUSY;
}
tmr->ppq = ppq;
snd_seq_timer_set_tick_resolution(&tmr->tick, tmr->tempo, tmr->ppq);
spin_unlock_irqrestore(&tmr->lock, flags);
return 0;
}
/* set current tick position */
int snd_seq_timer_set_position_tick(struct snd_seq_timer *tmr,
snd_seq_tick_time_t position)
{
unsigned long flags;
snd_assert(tmr, return -EINVAL);
spin_lock_irqsave(&tmr->lock, flags);
tmr->tick.cur_tick = position;
tmr->tick.fraction = 0;
spin_unlock_irqrestore(&tmr->lock, flags);
return 0;
}
/* set current real-time position */
int snd_seq_timer_set_position_time(struct snd_seq_timer *tmr,
snd_seq_real_time_t position)
{
unsigned long flags;
snd_assert(tmr, return -EINVAL);
snd_seq_sanity_real_time(&position);
spin_lock_irqsave(&tmr->lock, flags);
tmr->cur_time = position;
spin_unlock_irqrestore(&tmr->lock, flags);
return 0;
}
/* set timer skew */
int snd_seq_timer_set_skew(struct snd_seq_timer *tmr, unsigned int skew,
unsigned int base)
{
unsigned long flags;
snd_assert(tmr, return -EINVAL);
/* FIXME */
if (base != SKEW_BASE) {
snd_printd("invalid skew base 0x%x\n", base);
return -EINVAL;
}
spin_lock_irqsave(&tmr->lock, flags);
tmr->skew = skew;
spin_unlock_irqrestore(&tmr->lock, flags);
return 0;
}
int snd_seq_timer_open(struct snd_seq_queue *q)
{
struct s
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