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DEFINITIONS
This source file includes following definitions.
- tmr2ticks
- poll_def_tmr
- tmr_reset
- def_tmr_open
- def_tmr_close
- def_tmr_event
- def_tmr_get_time
- def_tmr_ioctl
- def_tmr_arm
/*
* sound/oss/sys_timer.c
*
* The default timer for the Level 2 sequencer interface
* Uses the (1/HZ sec) timer of kernel.
*/
/*
* Copyright (C) by Hannu Savolainen 1993-1997
*
* OSS/Free for Linux is distributed under the GNU GENERAL PUBLIC LICENSE (GPL)
* Version 2 (June 1991). See the "COPYING" file distributed with this software
* for more info.
*/
/*
* Thomas Sailer : ioctl code reworked (vmalloc/vfree removed)
* Andrew Veliath : adapted tmr2ticks from level 1 sequencer (avoid overflow)
*/
#include <linux/spinlock.h>
#include "sound_config.h"
static volatile int opened, tmr_running;
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);
static DEFINE_SPINLOCK(lock);
static DEFINE_TIMER(def_tmr, poll_def_tmr, 0, 0);
static unsigned long
tmr2ticks(int tmr_value)
{
/*
* Convert timer ticks to MIDI ticks
*/
unsigned long tmp;
unsigned long scale;
/* tmr_value (ticks per sec) *
1000000 (usecs per sec) / HZ (ticks per sec) -=> usecs */
tmp = tmr_value * (1000000 / HZ);
scale = (60 * 1000000) / (curr_tempo * curr_timebase); /* usecs per MIDI tick */
return (tmp + scale / 2) / scale;
}
static void
poll_def_tmr(unsigned long dummy)
{
if (opened)
{
{
def_tmr.expires = (1) + jiffies;
add_timer(&def_tmr);
};
if (tmr_running)
{
spin_lock(&lock);
tmr_ctr++;
curr_ticks = ticks_offs + tmr2ticks(tmr_ctr);
if (curr_ticks >= next_event_time)
{
next_event_time = (unsigned long) -1;
sequencer_timer(0);
}
spin_unlock(&lock);
}
}
}
static void
tmr_reset(void)
{
unsigned long flags;
spin_lock_irqsave(&lock,flags);
tmr_offs = 0;
ticks_offs = 0;
tmr_ctr = 0;
next_event_time = (unsigned long) -1;
prev_event_time = 0;
curr_ticks = 0;
spin_unlock_irqrestore(&lock,flags);
}
static int
def_tmr_open(int dev, int mode)
{
if (opened)
return -EBUSY;
tmr_reset();
curr_tempo = 60;
curr_timebase = 100;
opened = 1;
;
{
def_tmr.expires = (1) + jiffies;
add_timer(&def_tmr);
};
return 0;
}
static void
def_tmr_close(int dev)
{
opened = tmr_running = 0;
del_timer(&def_tmr);
}
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 > 360)
parm = 360;
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;
}
/* same as sound_timer.c:timer_ioctl!? */
static int def_tmr_ioctl(int dev, unsigned int cmd, void __user *arg)
{
int __user *p = arg;
int val;
switch (cmd) {
case SNDCTL_TMR_SOURCE:
return __put_user(TMR_INTERNAL, p);
case SNDCTL_TMR_START:
tmr_reset();
tmr_running = 1;
return 0;
case SNDCTL_TMR_STOP:
tmr_running = 0;
return 0;
case SNDCTL_TMR_CONTINUE:
tmr_running = 1;
return 0;
case SNDCTL_TMR_TIMEBASE:
if (__get_user(val, p))
return -EFAULT;
if (val) {
if (val < 1)
val = 1;
if (val > 1000)
val = 1000;
curr_timebase = val;
}
return __put_user(curr_timebase, p);
case SNDCTL_TMR_TEMPO:
if (__get_user(val, p))
return -EFAULT;
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;
reprogram_timer();
}
return __put_user(curr_tempo, p);
case SNDCTL_SEQ_CTRLRATE:
if (__get_user(val, p))
return -EFAULT;
if (val != 0) /* Can't change */
return -EINVAL;
val = ((curr_tempo * curr_timebase) + 30) / 60;
return __put_user(val, p);
case SNDCTL_SEQ_GETTIME:
return __put_user(curr_ticks, p);
case SNDCTL_TMR_METRONOME:
/* NOP */
break;
default:;
}
return -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 =
{
.owner = THIS_MODULE,
.info = {"System clock", 0},
.priority = 0, /* Priority */
.devlink = 0, /* Local device link */
.open = def_tmr_open,
.close = def_tmr_close,
.event = def_tmr_event,
.get_time = def_tmr_get_time,
.ioctl = def_tmr_ioctl,
.arm_timer = def_tmr_arm
};