/*
 * Copyright (c) 2003-2004 Apple Computer, Inc. All rights reserved.
 *
 * @APPLE_LICENSE_HEADER_START@
 * 
 * The contents of this file constitute Original Code as defined in and
 * are subject to the Apple Public Source License Version 1.1 (the
 * "License").  You may not use this file except in compliance with the
 * License.  Please obtain a copy of the License at
 * http://www.apple.com/publicsource and read it before using this file.
 * 
 * This Original Code and all software distributed under the License are
 * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
 * License for the specific language governing rights and limitations
 * under the License.
 * 
 * @APPLE_LICENSE_HEADER_END@
 */
/*
 * Copyright (c) 2003-2004 Apple Computer, Inc.  All rights reserved.
 *
 *
 */


#ifndef _POWERMAC7_2_SLEWCTRLLOOP_H
#define _POWERMAC7_2_SLEWCTRLLOOP_H

#include "IOPlatformSlewClockControl.h"
#include "IOPlatformCtrlLoop.h"

/*!	@class PowerMac7_2_CPUFanCtrlLoop
	@abstract This class implements a PID-based fan control loop for use on PowerMac7,2 machines.  This control loop is designed to work for both uni- and dual-processor machines.  There are actually two (mostly) independent control loops on dual-processor machines, but control is implemented in one control loop object to ease implementation of tach-lock. */

class PowerMac7_2_SlewCtrlLoop : public IOPlatformCtrlLoop
{

	OSDeclareDefaultStructors(PowerMac7_2_SlewCtrlLoop)

protected:

	IOPlatformSlewClockControl * slewControl;

	// We have to control napping of the processor(s).  This variable tells us what was the last
	// thing we programmed, so we don't have to calls this too often.
	bool lastAllowedNapping;

	// overrides from OSObject superclass
	virtual bool init( void );
	virtual void free( void );

public:

	virtual IOReturn initPlatformCtrlLoop(const OSDictionary *dict);
	virtual bool updateMetaState( void );
	virtual void adjustControls( void );

	virtual void controlRegistered( IOPlatformControl * aControl );
};

#endif	// _POWERMAC7_2_SLEWCTRLLOOP_H