Moved implementation of user timer to the firmware layer, implemented it for iriver, and made it shareable based on priorities. On iriver, the user timer is shared between the backlight fading and other use, so if a plugin registers the timer, the backlight will resort to simple on/off switching until the plugin releases the timer again. Sorted and bumped the plugin api.

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@7242 a1c6a512-1295-4272-9138-f99709370657

firmware/export/timer.h

@@ -0,0 +1,34 @@
+/***************************************************************************
+*             __________               __   ___.
+*   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
+*   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
+*   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
+*   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
+*                     \/            \/     \/    \/            \/
+* $Id$
+*
+* Copyright (C) 2005 Jens Arnold
+*
+* All files in this archive are subject to the GNU General Public License.
+* See the file COPYING in the source tree root for full license agreement.
+*
+* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
+* KIND, either express or implied.
+*
+****************************************************************************/
+
+#ifndef __TIMER_H__
+#define __TIMER_H__
+
+#include <stdbool.h>
+#include "config.h"
+
+#ifndef SIMULATOR
+
+bool timer_register(int reg_prio, void (*unregister_callback)(void),
+                    long cycles, int int_prio, void (*timer_callback)(void));
+bool timer_set_period(long cycles);
+void timer_unregister(void);
+
+#endif /* !SIMULATOR */
+#endif /* __TIMER_H__ */