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/***************************************************************************
* __________ __ ___.
* Open \______ \ ____ ____ | | _\_ |__ _______ ___
* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
* \/ \/ \/ \/ \/
* $Id$
*
* Copyright (C) 2008 by Miika Pekkarinen
*
* 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 software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
* KIND, either express or implied.
*
****************************************************************************/
#include <stdio.h>
#include "events.h"
#include "panic.h"
#define MAX_SYS_EVENTS 28
struct sysevent {
unsigned short id;
bool oneshot;
bool has_user_data;
union {
void (*callback)(unsigned short id, void *event_data);
struct {
void (*callback2)(unsigned short id, void *event_data, void *user_data);
void *user_data;
};
} handler;
};
static struct sysevent events[MAX_SYS_EVENTS];
static bool do_add_event(unsigned short id, bool oneshot, bool user_data_valid,
void *handler, void *user_data)
{
int i;
/* Check if the event already exists. */
for (i = 0; i < MAX_SYS_EVENTS; i++)
{
if (events[i].handler.callback == handler && events[i].id == id
&& (!user_data_valid || (user_data == events[i].handler.user_data)))
return false;
}
/* Try to find a free slot. */
for (i = 0; i < MAX_SYS_EVENTS; i++)
{
if (events[i].handler.callback == NULL)
{
events[i].id = id;
events[i].oneshot = oneshot;
if ((events[i].has_user_data = user_data_valid))
events[i].handler.user_data = user_data;
events[i].handler.callback = handler;
return true;
}
}
panicf("event line full");
return false;
}
bool add_event(unsigned short id, void (*handler)(unsigned short id, void *data))
{
return do_add_event(id, false, false, handler, NULL);
}
bool add_event_ex(unsigned short id, bool oneshot, void (*handler)(unsigned short id, void *event_data, void *user_data), void *user_data)
{
return do_add_event(id, oneshot, true, handler, user_data);
}
static void do_remove_event(unsigned short id, bool user_data_valid,
void *handler, void *user_data)
{
int i;
for (i = 0; i < MAX_SYS_EVENTS; i++)
{
if (events[i].id == id && events[i].handler.callback == handler
&& (!user_data_valid || (user_data == events[i].handler.user_data)))
{
events[i].handler.callback = NULL;
return;
}
}
}
void remove_event(unsigned short id, void (*handler)(unsigned short id, void *data))
{
do_remove_event(id, false, handler, NULL);
}
void remove_event_ex(unsigned short id,
void (*handler)(unsigned short id, void *event_data, void *user_data),
void *user_data)
{
do_remove_event(id, true, handler, user_data);
}
void send_event(unsigned short id, void *data)
{
int i;
for (i = 0; i < MAX_SYS_EVENTS; i++)
{
if (events[i].id == id && events[i].handler.callback != NULL)
{
if (events[i].has_user_data)
events[i].handler.callback2(id, data, events[i].handler.user_data);
else
events[i].handler.callback(id, data);
if (events[i].oneshot)
events[i].handler.callback = NULL;
}
}
}
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