306 lines
6.0 KiB
C
306 lines
6.0 KiB
C
/*
|
|
* sound/sys_timer.c
|
|
*
|
|
* The default timer for the Level 2 sequencer interface
|
|
* Uses the (100HZ) timer of kernel.
|
|
*
|
|
* Copyright by Hannu Savolainen 1993
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions are
|
|
* met: 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer. 2.
|
|
* Redistributions in binary form must reproduce the above copyright notice,
|
|
* this list of conditions and the following disclaimer in the documentation
|
|
* and/or other materials provided with the distribution.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND ANY
|
|
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
|
|
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
|
|
* DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR
|
|
* ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
|
|
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
|
|
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
* SUCH DAMAGE.
|
|
*
|
|
* $Id: sys_timer.c,v 1.7 1994/09/27 17:58:24 davidg Exp $
|
|
*/
|
|
|
|
#define SEQUENCER_C
|
|
#include "sound_config.h"
|
|
|
|
#ifdef CONFIGURE_SOUNDCARD
|
|
|
|
#ifndef EXCLUDE_SEQUENCER
|
|
|
|
static volatile int opened = 0, tmr_running = 0;
|
|
static volatile time_t tmr_offs, tmr_ctr;
|
|
static volatile unsigned long ticks_offs;
|
|
static volatile int curr_tempo, curr_timebase;
|
|
static volatile unsigned long curr_ticks;
|
|
static volatile unsigned long next_event_time;
|
|
static unsigned long prev_event_time;
|
|
|
|
static void poll_def_tmr (unsigned long dummy);
|
|
|
|
DEFINE_TIMER (def_tmr, poll_def_tmr);
|
|
|
|
static unsigned long
|
|
tmr2ticks (int tmr_value)
|
|
{
|
|
/*
|
|
* Convert system timer ticks (HZ) to MIDI ticks
|
|
*/
|
|
|
|
unsigned long tmp;
|
|
unsigned long scale;
|
|
|
|
tmp = (tmr_value * 1000) / HZ;/* Convert to msecs */
|
|
|
|
scale = (60 * 1000) / (curr_tempo * curr_timebase); /* msecs per MIDI tick */
|
|
|
|
return (tmp + (scale / 2)) / scale;
|
|
}
|
|
|
|
static void
|
|
poll_def_tmr (unsigned long dummy)
|
|
{
|
|
|
|
if (opened)
|
|
{
|
|
ACTIVATE_TIMER (def_tmr, poll_def_tmr, 1);
|
|
|
|
if (tmr_running)
|
|
{
|
|
tmr_ctr++;
|
|
curr_ticks = ticks_offs + tmr2ticks (tmr_ctr);
|
|
|
|
if (curr_ticks >= next_event_time)
|
|
{
|
|
next_event_time = 0xffffffff;
|
|
sequencer_timer ();
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
static void
|
|
tmr_reset (void)
|
|
{
|
|
unsigned long flags;
|
|
|
|
DISABLE_INTR (flags);
|
|
tmr_offs = 0;
|
|
ticks_offs = 0;
|
|
tmr_ctr = 0;
|
|
next_event_time = 0xffffffff;
|
|
prev_event_time = 0;
|
|
curr_ticks = 0;
|
|
RESTORE_INTR (flags);
|
|
}
|
|
|
|
static int
|
|
def_tmr_open (int dev, int mode)
|
|
{
|
|
if (opened)
|
|
return RET_ERROR (EBUSY);
|
|
|
|
tmr_reset ();
|
|
curr_tempo = 60;
|
|
curr_timebase = HZ;
|
|
opened = 1;
|
|
|
|
ACTIVATE_TIMER (def_tmr, poll_def_tmr, 1);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void
|
|
def_tmr_close (int dev)
|
|
{
|
|
opened = tmr_running = 0;
|
|
}
|
|
|
|
static int
|
|
def_tmr_event (int dev, unsigned char *event)
|
|
{
|
|
unsigned char cmd = event[1];
|
|
unsigned long parm = *(int *) &event[4];
|
|
|
|
switch (cmd)
|
|
{
|
|
case TMR_WAIT_REL:
|
|
parm += prev_event_time;
|
|
case TMR_WAIT_ABS:
|
|
if (parm > 0)
|
|
{
|
|
long time;
|
|
|
|
if (parm <= curr_ticks) /* It's the time */
|
|
return TIMER_NOT_ARMED;
|
|
|
|
time = parm;
|
|
next_event_time = prev_event_time = time;
|
|
|
|
return TIMER_ARMED;
|
|
}
|
|
break;
|
|
|
|
case TMR_START:
|
|
tmr_reset ();
|
|
tmr_running = 1;
|
|
break;
|
|
|
|
case TMR_STOP:
|
|
tmr_running = 0;
|
|
break;
|
|
|
|
case TMR_CONTINUE:
|
|
tmr_running = 1;
|
|
break;
|
|
|
|
case TMR_TEMPO:
|
|
if (parm)
|
|
{
|
|
if (parm < 8)
|
|
parm = 8;
|
|
if (parm > 250)
|
|
parm = 250;
|
|
tmr_offs = tmr_ctr;
|
|
ticks_offs += tmr2ticks (tmr_ctr);
|
|
tmr_ctr = 0;
|
|
curr_tempo = parm;
|
|
}
|
|
break;
|
|
|
|
case TMR_ECHO:
|
|
seq_copy_to_input (event, 8);
|
|
break;
|
|
|
|
default:;
|
|
}
|
|
|
|
return TIMER_NOT_ARMED;
|
|
}
|
|
|
|
static unsigned long
|
|
def_tmr_get_time (int dev)
|
|
{
|
|
if (!opened)
|
|
return 0;
|
|
|
|
return curr_ticks;
|
|
}
|
|
|
|
static int
|
|
def_tmr_ioctl (int dev,
|
|
unsigned int cmd, unsigned int arg)
|
|
{
|
|
switch (cmd)
|
|
{
|
|
case SNDCTL_TMR_SOURCE:
|
|
return IOCTL_OUT (arg, TMR_INTERNAL);
|
|
break;
|
|
|
|
case SNDCTL_TMR_START:
|
|
tmr_reset ();
|
|
tmr_running = 1;
|
|
return 0;
|
|
break;
|
|
|
|
case SNDCTL_TMR_STOP:
|
|
tmr_running = 0;
|
|
return 0;
|
|
break;
|
|
|
|
case SNDCTL_TMR_CONTINUE:
|
|
tmr_running = 1;
|
|
return 0;
|
|
break;
|
|
|
|
case SNDCTL_TMR_TIMEBASE:
|
|
{
|
|
int val = IOCTL_IN (arg);
|
|
|
|
if (val)
|
|
{
|
|
if (val < 1)
|
|
val = 1;
|
|
if (val > 1000)
|
|
val = 1000;
|
|
curr_timebase = val;
|
|
}
|
|
|
|
return IOCTL_OUT (arg, curr_timebase);
|
|
}
|
|
break;
|
|
|
|
case SNDCTL_TMR_TEMPO:
|
|
{
|
|
int val = IOCTL_IN (arg);
|
|
|
|
if (val)
|
|
{
|
|
if (val < 8)
|
|
val = 8;
|
|
if (val > 250)
|
|
val = 250;
|
|
tmr_offs = tmr_ctr;
|
|
ticks_offs += tmr2ticks (tmr_ctr);
|
|
tmr_ctr = 0;
|
|
curr_tempo = val;
|
|
}
|
|
|
|
return IOCTL_OUT (arg, curr_tempo);
|
|
}
|
|
break;
|
|
|
|
case SNDCTL_SEQ_CTRLRATE:
|
|
if (IOCTL_IN (arg) != 0) /* Can't change */
|
|
return RET_ERROR (EINVAL);
|
|
|
|
return IOCTL_OUT (arg, ((curr_tempo * curr_timebase) + 30) / 60);
|
|
break;
|
|
|
|
case SNDCTL_TMR_METRONOME:
|
|
/* NOP */
|
|
break;
|
|
|
|
default:;
|
|
}
|
|
|
|
return RET_ERROR (EINVAL);
|
|
}
|
|
|
|
static void
|
|
def_tmr_arm (int dev, long time)
|
|
{
|
|
if (time < 0)
|
|
time = curr_ticks + 1;
|
|
else if (time <= curr_ticks) /* It's the time */
|
|
return;
|
|
|
|
next_event_time = prev_event_time = time;
|
|
|
|
return;
|
|
}
|
|
|
|
struct sound_timer_operations default_sound_timer =
|
|
{
|
|
{"System Timer", 0},
|
|
0, /* Priority */
|
|
0, /* Local device link */
|
|
def_tmr_open,
|
|
def_tmr_close,
|
|
def_tmr_event,
|
|
def_tmr_get_time,
|
|
def_tmr_ioctl,
|
|
def_tmr_arm
|
|
};
|
|
|
|
#endif
|
|
#endif
|