MdePkg/Library/SerialPortLibNull/SerialPortLibNull.c

   1 /** @file
   2   Serial I/O Port library functions with no library constructor/destructor
   3
   4   Copyright (c) 2006, Intel Corporation
   5   All rights reserved. This program and the accompanying materials
   6   are licensed and made available under the terms and conditions of the BSD License
   7   which accompanies this distribution.  The full text of the license may be found at
   8   http://opensource.org/licenses/bsd-license.php
   9
  10   THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
  11   WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
  12
  13 **/
  14
  15 //
  16 // The package level header files this module uses
  17 //
  18 #include <Base.h>
  19 //
  20 // The protocols, PPI and GUID defintions for this module
  21 //
  22 //
  23 // The Library classes this module consumes
  24 //
  25 #include <Library/SerialPortLib.h>
  26
  27 /*
  28
  29   Programmed hardware of Serial port.
  30
  31   @return    Always return EFI_UNSUPPORTED.
  32
  33 **/
  34 RETURN_STATUS
  35 EFIAPI
  36 SerialPortInitialize (
  37   VOID
  38   )
  39 {
  40   return RETURN_UNSUPPORTED;
  41 }
  42
  43 /**
  44   Write data to serial device.
  45
  46   @param  Buffer           Point of data buffer which need to be writed.
  47   @param  NumberOfBytes    Number of output bytes which are cached in Buffer.
  48
  49   @retval 0                Write data failed.
  50   @retval !0               Actual number of bytes writed to serial device.
  51
  52 **/
  53 UINTN
  54 EFIAPI
  55 SerialPortWrite (
  56   IN UINT8     *Buffer,
  57   IN UINTN     NumberOfBytes
  58 )
  59 {
  60   return 0;
  61 }
  62
  63
  64 /**
  65   Read data from serial device and save the datas in buffer.
  66
  67   @param  Buffer           Point of data buffer which need to be writed.
  68   @param  NumberOfBytes    Number of output bytes which are cached in Buffer.
  69
  70   @retval 0                Read data failed.
  71   @retval !0               Aactual number of bytes read from serial device.
  72
  73 **/
  74 UINTN
  75 EFIAPI
  76 SerialPortRead (
  77   OUT UINT8     *Buffer,
  78   IN  UINTN     NumberOfBytes
  79 )
  80 {
  81   return 0;
  82 }
  83