MdePkg/Library/SerialPortLibNull/SerialPortLibNull.c

   1 /** @file
   2   Null Serial Port library instance with empty functions.
   3
   4   Copyright (c) 2006 - 2008, 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 #include <Base.h>
  17
  18
  19 #include <Library/SerialPortLib.h>
  20
  21 /**
  22   Programmed hardware of Serial port.
  23
  24   @return    Always return RETURN_UNSUPPORTED.
  25
  26 **/
  27 RETURN_STATUS
  28 EFIAPI
  29 SerialPortInitialize (
  30   VOID
  31   )
  32 {
  33   return RETURN_UNSUPPORTED;
  34 }
  35
  36 /**
  37   Write data to serial device.
  38
  39   @param  Buffer           Point of data buffer which need to be writed.
  40   @param  NumberOfBytes    Number of output bytes which are cached in Buffer.
  41
  42   @retval 0                No data is to be written.
  43
  44 **/
  45 UINTN
  46 EFIAPI
  47 SerialPortWrite (
  48   IN UINT8     *Buffer,
  49   IN UINTN     NumberOfBytes
  50 )
  51 {
  52   return 0;
  53 }
  54
  55
  56 /**
  57   Read data from serial device and save the datas in buffer.
  58
  59   @param  Buffer           Point of data buffer, which contains the data
  60                            returned from the serial device.
  61   @param  NumberOfBytes    Number of bytes which will be read.
  62
  63   @retval 0                No data is to be read.
  64
  65 **/
  66 UINTN
  67 EFIAPI
  68 SerialPortRead (
  69   OUT UINT8     *Buffer,
  70   IN  UINTN     NumberOfBytes
  71 )
  72 {
  73   return 0;
  74 }
  75