130 lines
3.9 KiB
C
130 lines
3.9 KiB
C
/***************************************************************************
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* __________ __ ___.
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* Open \______ \ ____ ____ | | _\_ |__ _______ ___
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* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
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* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
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* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
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* \/ \/ \/ \/ \/
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* $Id$
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*
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* Copyright (C) 2008 by Miika Pekkarinen
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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* KIND, either express or implied.
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*
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****************************************************************************/
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#include <stdio.h>
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#include "events.h"
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#include "panic.h"
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#define MAX_SYS_EVENTS 28
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struct sysevent {
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unsigned short id;
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bool oneshot;
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bool has_user_data;
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union {
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void (*callback)(unsigned short id, void *event_data);
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struct {
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void (*callback2)(unsigned short id, void *event_data, void *user_data);
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void *user_data;
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};
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} handler;
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};
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static struct sysevent events[MAX_SYS_EVENTS];
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static bool do_add_event(unsigned short id, bool oneshot, bool user_data_valid,
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void *handler, void *user_data)
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{
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int i;
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/* Check if the event already exists. */
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for (i = 0; i < MAX_SYS_EVENTS; i++)
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{
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if (events[i].handler.callback == handler && events[i].id == id
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&& (!user_data_valid || (user_data == events[i].handler.user_data)))
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return false;
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}
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/* Try to find a free slot. */
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for (i = 0; i < MAX_SYS_EVENTS; i++)
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{
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if (events[i].handler.callback == NULL)
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{
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events[i].id = id;
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events[i].oneshot = oneshot;
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if ((events[i].has_user_data = user_data_valid))
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events[i].handler.user_data = user_data;
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events[i].handler.callback = handler;
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return true;
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}
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}
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panicf("event line full");
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return false;
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}
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bool add_event(unsigned short id, void (*handler)(unsigned short id, void *data))
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{
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return do_add_event(id, false, false, handler, NULL);
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}
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bool add_event_ex(unsigned short id, bool oneshot, void (*handler)(unsigned short id, void *event_data, void *user_data), void *user_data)
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{
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return do_add_event(id, oneshot, true, handler, user_data);
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}
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static void do_remove_event(unsigned short id, bool user_data_valid,
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void *handler, void *user_data)
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{
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int i;
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for (i = 0; i < MAX_SYS_EVENTS; i++)
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{
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if (events[i].id == id && events[i].handler.callback == handler
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&& (!user_data_valid || (user_data == events[i].handler.user_data)))
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{
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events[i].handler.callback = NULL;
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return;
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}
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}
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}
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void remove_event(unsigned short id, void (*handler)(unsigned short id, void *data))
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{
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do_remove_event(id, false, handler, NULL);
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}
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void remove_event_ex(unsigned short id,
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void (*handler)(unsigned short id, void *event_data, void *user_data),
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void *user_data)
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{
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do_remove_event(id, true, handler, user_data);
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}
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void send_event(unsigned short id, void *data)
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{
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int i;
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for (i = 0; i < MAX_SYS_EVENTS; i++)
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{
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if (events[i].id == id && events[i].handler.callback != NULL)
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{
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if (events[i].has_user_data)
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events[i].handler.callback2(id, data, events[i].handler.user_data);
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else
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events[i].handler.callback(id, data);
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if (events[i].oneshot)
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events[i].handler.callback = NULL;
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}
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}
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}
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