MdePkg/Include/Protocol/HiiConfigAccess.h

   1 /** @file
   2
   3   The EFI HII results processing protocol invokes this type of protocol
   4   when it needs to forward results to a driver's configuration handler.
   5   This protocol is published by drivers providing and requesting
   6   configuration data from HII. It may only be invoked by HII.
   7
   8   Copyright (c) 2006 - 2009, Intel Corporation
   9   All rights reserved. This program and the accompanying materials
  10   are licensed and made available under the terms and conditions of the BSD License
  11   which accompanies this distribution.  The full text of the license may be found at
  12   http://opensource.org/licenses/bsd-license.php
  13
  14   THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
  15   WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
  16
  17 **/
  18
  19
  20 #ifndef __EFI_HII_CONFIG_ACCESS_H__
  21 #define __EFI_HII_CONFIG_ACCESS_H__
  22
  23 #include <Protocol/FormBrowser2.h>
  24
  25 #define EFI_HII_CONFIG_ACCESS_PROTOCOL_GUID  \
  26   { 0x330d4706, 0xf2a0, 0x4e4f, { 0xa3, 0x69, 0xb6, 0x6f, 0xa8, 0xd5, 0x43, 0x85 } }
  27
  28 typedef struct _EFI_HII_CONFIG_ACCESS_PROTOCOL  EFI_HII_CONFIG_ACCESS_PROTOCOL;
  29
  30 typedef UINTN EFI_BROWSER_ACTION;
  31
  32 #define EFI_BROWSER_ACTION_CHANGING   0
  33 #define EFI_BROWSER_ACTION_CHANGED    1
  34 #define EFI_BROWSER_ACTION_RETRIEVE   2
  35 #define EFI_BROWSER_ACTION_FORM_OPEN  3
  36 #define EFI_BROWSER_ACTION_FORM_CLOSE 4
  37
  38 /**
  39
  40   This function allows the caller to request the current
  41   configuration for one or more named elements. The resulting
  42   string is in <ConfigAltResp> format. Any and all alternative
  43   configuration strings shall also be appended to the end of the
  44   current configuration string. If they are, they must appear
  45   after the current configuration. They must contain the same
  46   routing (GUID, NAME, PATH) as the current configuration string.
  47   They must have an additional description indicating the type of
  48   alternative configuration the string represents,
  49   "ALTCFG=<StringToken>". That <StringToken> (when
  50   converted from Hex UNICODE to binary) is a reference to a
  51   string in the associated string pack.
  52
  53   @param This       Points to the EFI_HII_CONFIG_ACCESS_PROTOCOL.
  54
  55   @param Request    A null-terminated Unicode string in
  56                     <ConfigRequest> format. Note that this
  57                     includes the routing information as well as
  58                     the configurable name / value pairs. It is
  59                     invalid for this string to be in
  60                     <MultiConfigRequest> format.
  61
  62   @param Progress   On return, points to a character in the
  63                     Request string. Points to the string's null
  64                     terminator if request was successful. Points
  65                     to the most recent "&" before the first
  66                     failing name / value pair (or the beginning
  67                     of the string if the failure is in the first
  68                     name / value pair) if the request was not
  69                     successful
  70
  71   @param Results    A null-terminated Unicode string in
  72                     <ConfigAltResp> format which has all values
  73                     filled in for the names in the Request string.
  74                     String to be allocated by the called function.
  75
  76   @retval EFI_SUCCESS             The Results string is filled with the
  77                                   values corresponding to all requested
  78                                   names.
  79
  80   @retval EFI_OUT_OF_RESOURCES    Not enough memory to store the
  81                                   parts of the results that must be
  82                                   stored awaiting possible future
  83                                   protocols.
  84
  85   @retval EFI_INVALID_PARAMETER   For example, passing in a NULL
  86                                   for the Request parameter
  87                                   would result in this type of
  88                                   error. In this case, the
  89                                   Progress parameter would be
  90                                   set to NULL.
  91
  92   @retval EFI_NOT_FOUND           Routing data doesn't match any
  93                                   known driver. Progress set to the
  94                                   first character in the routing header.
  95                                   Note: There is no requirement that the
  96                                   driver validate the routing data. It
  97                                   must skip the <ConfigHdr> in order to
  98                                   process the names.
  99
 100   @retval EFI_INVALID_PARAMETER   Illegal syntax. Progress set
 101                                   to most recent "&" before the
 102                                   error or the beginning of the
 103                                   string.
 104
 105   @retval EFI_INVALID_PARAMETER   Unknown name. Progress points
 106                                   to the & before the name in
 107                                   question.
 108
 109 **/
 110 typedef
 111 EFI_STATUS
 112 (EFIAPI * EFI_HII_ACCESS_EXTRACT_CONFIG)(
 113   IN CONST  EFI_HII_CONFIG_ACCESS_PROTOCOL  *This,
 114   IN CONST  EFI_STRING                      Request,
 115   OUT       EFI_STRING                      *Progress,
 116   OUT       EFI_STRING                      *Results
 117 );
 118
 119
 120 /**
 121
 122   This function applies changes in a driver's configuration.
 123   Input is a Configuration, which has the routing data for this
 124   driver followed by name / value configuration pairs. The driver
 125   must apply those pairs to its configurable storage. If the
 126   driver's configuration is stored in a linear block of data
 127   and the driver's name / value pairs are in <BlockConfig>
 128   format, it may use the ConfigToBlock helper function (above) to
 129   simplify the job.
 130
 131   @param This           Points to the EFI_HII_CONFIG_ACCESS_PROTOCOL.
 132
 133   @param Configuration  A null-terminated Unicode string in
 134                         <ConfigString> format.
 135
 136   @param Progress       A pointer to a string filled in with the
 137                         offset of the most recent '&' before the
 138                         first failing name / value pair (or the
 139                         beginn ing of the string if the failure
 140                         is in the first name / value pair) or
 141                         the terminating NULL if all was
 142                         successful.
 143
 144   @retval EFI_SUCCESS             The results have been distributed or are
 145                                   awaiting distribution.
 146
 147   @retval EFI_OUT_OF_RESOURCES    Not enough memory to store the
 148                                   parts of the results that must be
 149                                   stored awaiting possible future
 150                                   protocols.
 151
 152   @retval EFI_INVALID_PARAMETERS  Passing in a NULL for the
 153                                   Results parameter would result
 154                                   in this type of error.
 155
 156   @retval EFI_NOT_FOUND           Target for the specified routing data
 157                                   was not found
 158
 159 **/
 160 typedef
 161 EFI_STATUS
 162 (EFIAPI * EFI_HII_ACCESS_ROUTE_CONFIG)(
 163   IN CONST  EFI_HII_CONFIG_ACCESS_PROTOCOL  *This,
 164   IN CONST  EFI_STRING                      Configuration,
 165   OUT       EFI_STRING                      *Progress
 166 );
 167
 168 /**
 169
 170   This function is called to provide results data to the driver.
 171   This data consists of a unique key that is used to identify
 172   which data is either being passed back or being asked for.
 173
 174   @param  This                   Points to the EFI_HII_CONFIG_ACCESS_PROTOCOL.
 175   @param  Action                 Specifies the type of action taken by the browser.
 176   @param  QuestionId             A unique value which is sent to the original
 177                                  exporting driver so that it can identify the type
 178                                  of data to expect. The format of the data tends to
 179                                  vary based on the opcode that generated the callback.
 180   @param  Type                   The type of value for the question.
 181   @param  Value                  A pointer to the data being sent to the original
 182                                  exporting driver.
 183   @param  ActionRequest          On return, points to the action requested by the
 184                                  callback function.
 185
 186   @retval EFI_SUCCESS            The callback successfully handled the action.
 187   @retval EFI_OUT_OF_RESOURCES   Not enough storage is available to hold the
 188                                  variable and its data.
 189   @retval EFI_DEVICE_ERROR       The variable could not be saved.
 190   @retval EFI_UNSUPPORTED        The specified Action is not supported by the
 191                                  callback.
 192 **/
 193 typedef
 194 EFI_STATUS
 195 (EFIAPI *EFI_HII_ACCESS_FORM_CALLBACK)(
 196   IN     CONST EFI_HII_CONFIG_ACCESS_PROTOCOL   *This,
 197   IN     EFI_BROWSER_ACTION                     Action,
 198   IN     EFI_QUESTION_ID                        QuestionId,
 199   IN     UINT8                                  Type,
 200   IN OUT EFI_IFR_TYPE_VALUE                     *Value,
 201   OUT    EFI_BROWSER_ACTION_REQUEST             *ActionRequest
 202   )
 203   ;
 204
 205 ///
 206 /// This protocol provides a callable interface between the HII and
 207 /// drivers. Only drivers which provide IFR data to HII are required
 208 /// to publish this protocol.
 209 ///
 210 struct _EFI_HII_CONFIG_ACCESS_PROTOCOL {
 211   EFI_HII_ACCESS_EXTRACT_CONFIG     ExtractConfig;
 212   EFI_HII_ACCESS_ROUTE_CONFIG       RouteConfig;
 213   EFI_HII_ACCESS_FORM_CALLBACK      Callback;
 214 } ;
 215
 216 extern EFI_GUID gEfiHiiConfigAccessProtocolGuid;
 217
 218 #endif
 219
 220