MdePkg/Include/Protocol/MmUsbDispatch.h

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

  Provides the parent dispatch service for the USB 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_USB_DISPATCH_H_
#define _MM_USB_DISPATCH_H_

#include <Pi/PiMmCis.h>

#define EFI_MM_USB_DISPATCH_PROTOCOL_GUID \
  { \
    0xee9b8d90, 0xc5a6, 0x40a2, {0xbd, 0xe2, 0x52, 0x55, 0x8d, 0x33, 0xcc, 0xa1 } \
  }

///
/// USB MMI event types
///
typedef enum {
  UsbLegacy,
  UsbWake
} EFI_USB_MMI_TYPE;

///
/// The dispatch function's context.
///
typedef struct {
  ///
  /// Describes whether this child handler will be invoked in response to a USB legacy
  /// emulation event, such as port-trap on the PS/2* keyboard control registers, or to a
  /// USB wake event, such as resumption from a sleep state.
  ///
  EFI_USB_MMI_TYPE            Type;
  ///
  /// The device path is part of the context structure and describes the location of the
  /// particular USB host controller in the system for which this register event will occur.
  /// This location is important because of the possible integration of several USB host
  /// controllers in a system.
  ///
  EFI_DEVICE_PATH_PROTOCOL    *Device;
} EFI_MM_USB_REGISTER_CONTEXT;

typedef struct _EFI_MM_USB_DISPATCH_PROTOCOL EFI_MM_USB_DISPATCH_PROTOCOL;

/**
  Provides the parent dispatch service for the USB MMI source generator.

  This service registers a function (DispatchFunction) which will be called when the USB-
  related MMI specified by RegisterContext has occurred. 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 containing NULL and
  CommBufferSize containing zero.

  @param[in]  This               Pointer to the EFI_MM_USB_DISPATCH_PROTOCOL instance.
  @param[in]  DispatchFunction   Function to register for handler when a USB-related MMI occurs.
  @param[in]  RegisterContext    Pointer to the dispatch function's context.
                                 The caller fills this context in before calling
                                 the register function to indicate to the register
                                 function the USB MMI types 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 USB MMI type
                                 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_USB_REGISTER)(
  IN  CONST EFI_MM_USB_DISPATCH_PROTOCOL  *This,
  IN        EFI_MM_HANDLER_ENTRY_POINT    DispatchFunction,
  IN  CONST EFI_MM_USB_REGISTER_CONTEXT   *RegisterContext,
  OUT       EFI_HANDLE                    *DispatchHandle
  );

/**
  Unregisters a USB service.

  This service removes the handler associated with DispatchHandle so that it will no longer be
  called when the USB event occurs.

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

  @retval EFI_SUCCESS            The dispatch function has been successfully
                                 unregistered and the MMI source has been disabled
                                 if there are no other registered child dispatch
                                 functions for this MMI source.
  @retval EFI_INVALID_PARAMETER  The DispatchHandle was not valid.
**/
typedef
EFI_STATUS
(EFIAPI *EFI_MM_USB_UNREGISTER)(
  IN CONST EFI_MM_USB_DISPATCH_PROTOCOL  *This,
  IN       EFI_HANDLE                    DispatchHandle
  );

///
/// Interface structure for the MM USB MMI Dispatch Protocol
///
/// This protocol provides the parent dispatch service for the USB MMI source generator.
///
struct _EFI_MM_USB_DISPATCH_PROTOCOL {
  EFI_MM_USB_REGISTER      Register;
  EFI_MM_USB_UNREGISTER    UnRegister;
};

extern EFI_GUID  gEfiMmUsbDispatchProtocolGuid;

#endif