/*++

Copyright (c) 2000 Microsoft Corporation. All rights reserved.

Module Name:

    upssvc.h

Abstract:

    This file defines the interface to the serial UPS service in 
    Windows 2000.  Please see the UPS documentation in the DDK
    for more information.


--*/

#ifndef _INC_UPS_DRIVER_H_
#define _INC_UPS_DRIVER_H_

#if ((NTDDI_VERSION >= NTDDI_WINXP) && (NTDDI_VERSION < NTDDI_VISTA))

//
// values that represent the state of the
// UPS system - these values are used in the
// UPSGetState and UPSWaitForStateChange functions
//
#define UPS_ONLINE 1
#define UPS_ONBATTERY 2
#define UPS_LOWBATTERY 4
#define UPS_NOCOMM 8
#define UPS_CRITICAL 16


//
// possible error codes returned from UPSInit
//
#define UPS_INITUNKNOWNERROR    0
#define UPS_INITOK              1
#define UPS_INITNOSUCHDRIVER    2
#define UPS_INITBADINTERFACE    3
#define UPS_INITREGISTRYERROR   4
#define UPS_INITCOMMOPENERROR   5
#define UPS_INITCOMMSETUPERROR  6


/**
* UPSInit
*
* Description:
*   
*   The UPSInit function must be called before any
*   other function in this file
*
* Parameters:
*   None
*
* Returns:
*   UPS_INITOK: Initalization was successful
*   UPS_INITNOSUCHDRIVER:   The configured driver DLL can't be opened    
*   UPS_INITBADINTERFACE:   The configured driver DLL doesn't support 
*                           the UPS driver interface
*   UPS_INITREGISTRYERROR:  The 'Options' registry value is corrupt
*   UPS_INITCOMMOPENERROR:  The comm port could not be opened
*   UPS_INITCOMMSETUPERROR: The comm port could not be configured
*   UPS_INITUNKNOWNERROR:   Undefined error has occurred
*   
*/
__checkReturn
DWORD
UPSInit(
    void
    );


/**
* UPSStop
*
* Description:
*   After a call to UPSStop, only the UPSInit
*   function is valid.  This call will unload the
*   UPS driver interface and stop monitoring of the
*   UPS system
*
* Parameters:
*   None
*
* Returns:
*   None
*   
*/
void
UPSStop(
    void
    );


/**
* UPSWaitForStateChange
*
* Description:
*   Blocks until the state of the UPS differs
*   from the value passed in via aCurrentState or 
*   anInterval milliseconds has expired.  If
*   anInterval has a value of INFINITE this 
*   function will never timeout
*
* Parameters:
*   aState: defines the state to wait for a change from,
*           possible values:
*           UPS_ONLINE 
*           UPS_ONBATTERY
*           UPS_LOWBATTERY
*           UPS_NOCOMM
*
*   anInterval: timeout in milliseconds, or INFINITE for
*               no timeout interval
*
* Returns:
*   None
*   
*/
void
UPSWaitForStateChange(
    __in DWORD aCurrentState,
    __in DWORD anInterval
    );


/**
* UPSGetState
*
* Description:
*   returns the current state of the UPS
*
* Parameters:
*   None
*
* Returns: 
*   possible values:
*           UPS_ONLINE 
*           UPS_ONBATTERY
*           UPS_LOWBATTERY
*           UPS_NOCOMM
*   
*/
DWORD
UPSGetState(
    void
    );


/**
* UPSCancelWait
*
* Description:
*   interrupts pending calls to UPSWaitForStateChange
*   without regard to timout or state change
*
* Parameters:
*   None
*
* Returns:
*   None
*   
*/
void
UPSCancelWait(
    void
    );


/**
* UPSTurnOff
*
* Description:
*   Attempts to turn off the outlets on the UPS
*   after the specified delay.  This call must
*   return immediately.  Any work, such as a timer,
*   must be performed on a another thread.
*
* Parameters:
*   aTurnOffDelay: the minimum amount of time to wait before
*                  turning off the outlets on the UPS
*
* Returns:
*   None
*   
*/
void
UPSTurnOff(
    __in DWORD aTurnOffDelay
    );

#endif // ((NTDDI_VERSION >= NTDDI_WINXP) && (NTDDI_VERSION < NTDDI_VISTA))

#endif