MdePkg/Include/Protocol/MmGpiDispatch.h

   1 /** @file
   2   MM General Purpose Input (GPI) Dispatch Protocol as defined in PI 1.5 Specification
   3   Volume 4 Management Mode Core Interface.
   4
   5   This protocol provides the parent dispatch service for the General Purpose Input
   6   (GPI) MMI source generator.
   7
   8   The EFI_MM_GPI_DISPATCH_PROTOCOL provides the ability to install child handlers for the
   9   given event types.  Several inputs can be enabled.  This purpose of this interface is to generate an
  10   MMI in response to any of these inputs having a true value provided.
  11
  12   Copyright (c) 2017, Intel Corporation. All rights reserved.<BR>
  13   This program and the accompanying materials
  14   are licensed and made available under the terms and conditions of the BSD License
  15   which accompanies this distribution.  The full text of the license may be found at
  16   http://opensource.org/licenses/bsd-license.php
  17
  18   THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
  19   WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
  20
  21   @par Revision Reference:
  22   This protocol is from PI Version 1.5.
  23
  24 **/
  25
  26 #ifndef _MM_GPI_DISPATCH_H_
  27 #define _MM_GPI_DISPATCH_H_
  28
  29 #include <Pi/PiMmCis.h>
  30
  31 #define EFI_MM_GPI_DISPATCH_PROTOCOL_GUID \
  32   { \
  33     0x25566b03, 0xb577, 0x4cbf, {0x95, 0x8c, 0xed, 0x66, 0x3e, 0xa2, 0x43, 0x80 } \
  34   }
  35
  36 ///
  37 /// The dispatch function's context.
  38 ///
  39 typedef struct {
  40   ///
  41   /// A number from one of 2^64 possible GPIs that can generate an MMI. A
  42   /// 0 corresponds to logical GPI[0]; 1 corresponds to logical GPI[1]; and
  43   /// GpiNum of N corresponds to GPI[N], where N can span from 0 to 2^64-1.
  44   ///
  45   UINT64 GpiNum;
  46 } EFI_MM_GPI_REGISTER_CONTEXT;
  47
  48 typedef struct _EFI_MM_GPI_DISPATCH_PROTOCOL EFI_MM_GPI_DISPATCH_PROTOCOL;
  49
  50 /**
  51   Registers a child MMI source dispatch function with a parent MM driver.
  52
  53   This service registers a function (DispatchFunction) which will be called when an MMI is
  54   generated because of one or more of the GPIs specified by RegisterContext. On return,
  55   DispatchHandle contains a unique handle which may be used later to unregister the function
  56   using UnRegister().
  57   The DispatchFunction will be called with Context set to the same value as was passed into
  58   this function in RegisterContext and with CommBuffer pointing to another instance of
  59   EFI_MM_GPI_REGISTER_CONTEXT describing the GPIs which actually caused the MMI and
  60   CommBufferSize pointing to the size of the structure.
  61
  62   @param[in]  This               Pointer to the EFI_MM_GPI_DISPATCH_PROTOCOL instance.
  63   @param[in]  DispatchFunction   Function to register for handler when the specified GPI causes an MMI.
  64   @param[in]  RegisterContext    Pointer to the dispatch function's context.
  65                                  The caller fills this context in before calling
  66                                  the register function to indicate to the register
  67                                  function the GPI(s) for which the dispatch function
  68                                  should be invoked.
  69   @param[out] DispatchHandle     Handle generated by the dispatcher to track the
  70                                  function instance.
  71
  72   @retval EFI_SUCCESS            The dispatch function has been successfully
  73                                  registered and the MMI source has been enabled.
  74   @retval EFI_DEVICE_ERROR       The driver was unable to enable the MMI source.
  75   @retval EFI_INVALID_PARAMETER  RegisterContext is invalid. The GPI input value
  76                                  is not within valid range.
  77   @retval EFI_OUT_OF_RESOURCES   There is not enough memory (system or MM) to manage this child.
  78 **/
  79 typedef
  80 EFI_STATUS
  81 (EFIAPI *EFI_MM_GPI_REGISTER)(
  82   IN CONST EFI_MM_GPI_DISPATCH_PROTOCOL    *This,
  83   IN       EFI_MM_HANDLER_ENTRY_POINT      DispatchFunction,
  84   IN CONST EFI_MM_GPI_REGISTER_CONTEXT     *RegisterContext,
  85   OUT      EFI_HANDLE                      *DispatchHandle
  86   );
  87
  88 /**
  89   Unregisters a General Purpose Input (GPI) service.
  90
  91   This service removes the handler associated with DispatchHandle so that it will no longer be
  92   called when the GPI triggers an MMI.
  93
  94   @param[in]  This               Pointer to the EFI_MM_GPI_DISPATCH_PROTOCOL instance.
  95   @param[in]  DispatchHandle     Handle of the service to remove.
  96
  97   @retval EFI_SUCCESS            Handle of the service to remove.
  98   @retval EFI_INVALID_PARAMETER  The DispatchHandle was not valid.
  99 **/
 100 typedef
 101 EFI_STATUS
 102 (EFIAPI *EFI_MM_GPI_UNREGISTER)(
 103   IN CONST EFI_MM_GPI_DISPATCH_PROTOCOL    *This,
 104   IN       EFI_HANDLE                      DispatchHandle
 105   );
 106
 107 ///
 108 /// Interface structure for the MM GPI MMI Dispatch Protocol
 109 ///
 110 /// The MM GPI MMI Dispatch Protocol provides the parent dispatch service
 111 /// for the General Purpose Input (GPI) MMI source generator.
 112 ///
 113 struct _EFI_MM_GPI_DISPATCH_PROTOCOL {
 114   EFI_MM_GPI_REGISTER    Register;
 115   EFI_MM_GPI_UNREGISTER  UnRegister;
 116   ///
 117   /// Denotes the maximum value of inputs that can have handlers attached.
 118   ///
 119   UINTN                   NumSupportedGpis;
 120 };
 121
 122 extern EFI_GUID gEfiMmGpiDispatchProtocolGuid;
 123
 124 #endif
 125