MdePkg/Include/Protocol/MmPowerButtonDispatch.h

/** @file
  MM Power Button Dispatch Protocol as defined in PI 1.5 Specification
  Volume 4 Management Mode Core Interface.

  This protocol provides the parent dispatch service for the power button MMI source generator.

  Copyright (c) 2017, Intel Corporation. All rights reserved.<BR>
  SPDX-License-Identifier: BSD-2-Clause-Patent

  @par Revision Reference:
  This protocol is from PI Version 1.5.

**/

#ifndef _MM_POWER_BUTTON_DISPATCH_H_
#define _MM_POWER_BUTTON_DISPATCH_H_

#include <Pi/PiMmCis.h>

#define EFI_MM_POWER_BUTTON_DISPATCH_PROTOCOL_GUID \
  { \
    0x1b1183fa, 0x1823, 0x46a7, {0x88, 0x72, 0x9c, 0x57, 0x87, 0x55, 0x40, 0x9d } \
  }

///
/// Power Button phases.
///
typedef enum {
  EfiPowerButtonEntry,
  EfiPowerButtonExit,
  EfiPowerButtonMax
} EFI_POWER_BUTTON_PHASE;

///
/// The dispatch function's context.
///
typedef struct {
  ///
  /// Designates whether this handler should be invoked upon entry or exit.
  ///
  EFI_POWER_BUTTON_PHASE    Phase;
} EFI_MM_POWER_BUTTON_REGISTER_CONTEXT;

typedef struct _EFI_MM_POWER_BUTTON_DISPATCH_PROTOCOL EFI_MM_POWER_BUTTON_DISPATCH_PROTOCOL;

/**
  Provides the parent dispatch service for a power button event.

  This service registers a function (DispatchFunction) which will be called when an MMI is
  generated because the power button was pressed or released, as specified by RegisterContext.
  On return, DispatchHandle contains a unique handle which may be used later to unregister the
  function using UnRegister().
  The DispatchFunction will be called with Context set to the same value as was passed into
  this function in RegisterContext and with CommBuffer and CommBufferSize set to NULL.

  @param[in]  This               Pointer to the EFI_MM_POWER_BUTTON_DISPATCH_PROTOCOL instance.
  @param[in]  DispatchFunction   Function to register for handler when power button is pressed or released.
  @param[in]  RegisterContext    Pointer to the dispatch function's context. The caller fills in this context
                                 before calling the Register() function to indicate to the Register() function
                                 the power button MMI phase for which the dispatch function should be invoked.
  @param[out] DispatchHandle     Handle generated by the dispatcher to track the function instance.

  @retval EFI_SUCCESS            The dispatch function has been successfully
                                 registered and the MMI source has been enabled.
  @retval EFI_DEVICE_ERROR       The driver was unable to enable the MMI source.
  @retval EFI_INVALID_PARAMETER  RegisterContext is invalid. The power button input value
                                 is not within valid range.
  @retval EFI_OUT_OF_RESOURCES   There is not enough memory (system or MM) to manage this child.
**/
typedef
EFI_STATUS
(EFIAPI *EFI_MM_POWER_BUTTON_REGISTER)(
  IN CONST EFI_MM_POWER_BUTTON_DISPATCH_PROTOCOL  *This,
  IN       EFI_MM_HANDLER_ENTRY_POINT             DispatchFunction,
  IN       EFI_MM_POWER_BUTTON_REGISTER_CONTEXT   *RegisterContext,
  OUT      EFI_HANDLE                             *DispatchHandle
  );

/**
  Unregisters a power-button service.

  This service removes the handler associated with DispatchHandle so that it will no longer be
  called when the standby button is pressed or released.

  @param[in] This                Pointer to the EFI_MM_POWER_BUTTON_DISPATCH_PROTOCOL instance.
  @param[in] DispatchHandle      Handle of the service to remove.

  @retval EFI_SUCCESS            The service has been successfully removed.
  @retval EFI_INVALID_PARAMETER  The DispatchHandle was not valid.
**/
typedef
EFI_STATUS
(EFIAPI *EFI_MM_POWER_BUTTON_UNREGISTER)(
  IN CONST EFI_MM_POWER_BUTTON_DISPATCH_PROTOCOL  *This,
  IN       EFI_HANDLE                             DispatchHandle
  );

///
/// Interface structure for the MM Power Button Dispatch Protocol.
///
/// This protocol provides the parent dispatch service for the power button MMI source generator.
///
struct _EFI_MM_POWER_BUTTON_DISPATCH_PROTOCOL {
  EFI_MM_POWER_BUTTON_REGISTER      Register;
  EFI_MM_POWER_BUTTON_UNREGISTER    UnRegister;
};

extern EFI_GUID  gEfiMmPowerButtonDispatchProtocolGuid;

#endif