894a9d9063
We have this nice event library laying around probably a few more places we could use event callbacks Change-Id: I9180fa9d78788d161f2587110644ca3e08df6f50
112 lines
4 KiB
C
112 lines
4 KiB
C
/***************************************************************************
|
|
* __________ __ ___.
|
|
* 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.
|
|
*
|
|
****************************************************************************/
|
|
|
|
#ifndef _EVENTS_H
|
|
#define _EVENTS_H
|
|
|
|
#include <stdbool.h>
|
|
/**
|
|
* Synchronouos event system.
|
|
*
|
|
* Callbacks are subscribed with add_event() or add_event_ex(). events
|
|
* are fired using send_event().
|
|
*
|
|
* Events are always dispatched synchronously: the callbacks are called
|
|
* in the thread context of the event sender, without context switch. This
|
|
* also means that callbacks should be as simple as possible to avoid
|
|
* blocking the sender and other callbacks
|
|
*
|
|
* Use the kernel-level event_queue for cross-thread event dispatching.
|
|
* */
|
|
|
|
/*
|
|
* Only CLASS defines and firmware/ level events should be defined here.
|
|
* apps/ level events are defined in apps/appevents.h
|
|
*
|
|
* High byte = Event class definition
|
|
* Low byte = Event ID
|
|
*/
|
|
|
|
#define EVENT_CLASS_DISK 0x0100
|
|
#define EVENT_CLASS_PLAYBACK 0x0200
|
|
#define EVENT_CLASS_BUFFERING 0x0400
|
|
#define EVENT_CLASS_GUI 0x0800
|
|
#define EVENT_CLASS_RECORDING 0x1000
|
|
#define EVENT_CLASS_LCD 0x2000
|
|
#define EVENT_CLASS_VOICE 0x4000
|
|
#define EVENT_CLASS_SYSTEM 0x8000 /*LAST ONE */
|
|
/**
|
|
* Subscribe to an event with a simple callback. The callback will be called
|
|
* synchronously everytime the event fires, passing the event id and data to
|
|
* the callback.
|
|
*
|
|
* Must be removed with remove_event().
|
|
*/
|
|
bool add_event(unsigned short id, void (*handler)(unsigned short id, void *event_data));
|
|
|
|
/**
|
|
* Subscribe to an event with a detailed callback. The callback will be called
|
|
* synchronously everytime the event fires, passing the event id and data, as
|
|
* well as the user_data pointer passed here, to the callback.
|
|
*
|
|
* With oneshot == true, the callback is unsubscribed automatically after
|
|
* the event fired for the first time. In this case the event need not to be
|
|
* removed with remove_event_ex().
|
|
*
|
|
* Must be removed with remove_event_ex(). remove_event() will never remove
|
|
* events added with this function.
|
|
*/
|
|
bool add_event_ex(unsigned short id, bool oneshot, void (*handler)(unsigned short id, void *event_data, void *user_data), void *user_data);
|
|
|
|
/**
|
|
* Unsubscribe a callback from an event. The handler pointer is matched.
|
|
*
|
|
* This will only work for subscriptions made with add_event().
|
|
*/
|
|
void remove_event(unsigned short id, void (*handler)(unsigned short id, void *data));
|
|
|
|
/**
|
|
* Unsubscribe a callback from an event. The handler and user_data pointers
|
|
* are matched. That means the same user_data that was passed to add_event_ex()
|
|
* must be passed to this too.
|
|
*
|
|
* This will only work for subscriptions made with add_event_ex().
|
|
*/
|
|
void remove_event_ex(unsigned short id, void (*handler)(unsigned short id, void *event_data, void *user_data), void *user_data);
|
|
|
|
/**
|
|
* Fire an event, which synchronously calls all subscribed callbacks. The
|
|
* event id and data pointer are passed to the callbacks as well, and
|
|
* optionally the user_data pointer from add_event_ex().
|
|
*/
|
|
void send_event(unsigned short id, void *data);
|
|
|
|
/** System events **/
|
|
enum {
|
|
/* USB_INSERTED
|
|
data = &usbmode */
|
|
SYS_EVENT_USB_INSERTED = (EVENT_CLASS_SYSTEM|1),
|
|
/* USB_EXTRACTED
|
|
data = NULL */
|
|
SYS_EVENT_USB_EXTRACTED,
|
|
};
|
|
|
|
#endif
|