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/*
* Purpose: Default MIDI timer (using system clock)
*/
/*
*
* This file is part of Open Sound System.
*
* Copyright (C) 4Front Technologies 1996-2008.
*
* This this source file is released under GPL v2 license (no other versions).
* See the COPYING file included in the main directory of this source
* distribution for the license terms and conditions.
*
*/
#include "oss_config.h"
#include "midi_core.h"
typedef struct
{
unsigned long long start_time;
timeout_id_t timeout_id;
oss_midi_wait_callback_t timer_callback;
void *arg;
} deftmr_timerc_t;
static unsigned long long tick_scale = 1;
static int
deftmr_create_instance (int timer_dev, int driver_dev)
{
deftmr_timerc_t *timerc;
if ((timerc = KERNEL_MALLOC (sizeof (*timerc))) == NULL)
return OSS_ENOMEM;
memset (timerc, 0, sizeof (*timerc));
oss_timer_devs[timer_dev]->timerc = timerc;
return 0;
}
static void
deftmr_free_instance (int timer_dev, int driver_dev)
{
deftmr_timerc_t *timerc;
timerc = oss_timer_devs[timer_dev]->timerc;
untimeout (timerc->timeout_id);
if (timerc != NULL)
KERNEL_FREE (timerc);
oss_timer_devs[timer_dev]->timerc = NULL;
}
static int
deftmr_attach_client (int timer_dev, int mididev)
{
return 0;
}
static void
deftmr_detach_client (int timer_dev, int mididev)
{
}
static int
deftmr_ioctl (int timer_dev, unsigned int cmd, ioctl_arg arg)
{
return OSS_EINVAL;
}
static int
deftmr_set_source (int timer_dev, int source)
{
return source;
}
static int
deftmr_set_tempo (int timer_dev, int tempo)
{
return tempo;
}
static int
deftmr_set_timebase (int timer_dev, int timebase)
{
return timebase;
}
static int
deftmr_start (int timer_dev, oss_uint64_t tick)
{
deftmr_timerc_t *timerc;
timerc = oss_timer_devs[timer_dev]->timerc;
if (timerc == NULL)
{
cmn_err (CE_WARN, "deftmr_start: timerc==NULL\n");
return OSS_EIO;
}
timerc->start_time = GET_JIFFIES ();
return 0;
}
static int
deftmr_stop (int timer_dev)
{
deftmr_timerc_t *timerc;
timerc = oss_timer_devs[timer_dev]->timerc;
untimeout (timerc->timeout_id);
return 0;
}
static int
deftmr_cont (int timer_dev)
{
return 0;
}
static int
deftmr_wait (int timer_dev, unsigned long long time,
oss_midi_wait_callback_t callback, void *arg)
{
deftmr_timerc_t *timerc;
unsigned long long t;
timerc = oss_timer_devs[timer_dev]->timerc;
untimeout (timerc->timeout_id);
t = ((oss_uint64_t) time + (tick_scale / 2)) / tick_scale;
t += timerc->start_time;
t -= GET_JIFFIES ();
if (t < 0)
{
return 1;
}
timerc->timeout_id = timeout (callback, arg, t);
return 0;
}
static unsigned long long
deftmr_get_current_time (int timer_dev)
{
unsigned long long t;
deftmr_timerc_t *timerc;
timerc = oss_timer_devs[timer_dev]->timerc;
/*
* Compute time in system ticks since start of the timer
*/
t = GET_JIFFIES ();
if (t < timerc->start_time)
return 0;
t -= timerc->start_time;
return t * tick_scale; /* In microseconds */
}
oss_timer_driver_t default_midi_driver = {
deftmr_create_instance,
deftmr_free_instance,
deftmr_attach_client,
deftmr_detach_client,
deftmr_ioctl,
deftmr_wait,
deftmr_get_current_time,
deftmr_set_source,
deftmr_set_tempo,
deftmr_set_timebase,
deftmr_start,
deftmr_stop,
deftmr_cont
};
void
attach_oss_default_timer (oss_device_t * osdev)
{
int timer_dev;
tick_scale = 1000000 / OSS_HZ;
if ((timer_dev = oss_install_timer (OSS_TIMER_DRIVER_VERSION, "System timer", &default_midi_driver, sizeof (oss_timer_driver_t), 0, /* Flags */
16, /* max_instances */
1000000 / OSS_HZ, /* Resolution */
NULL, osdev)) < 0)
{
cmn_err (CE_WARN, "Failed to install default MIDI timer\n");
return;
}
}
void
detach_oss_default_timer ()
{
}
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