EmbeddedPkg/Library/TemplateSerialPortLib/TemplateSerialPortLib.c

   1 /** @file
   2   Serial I/O Port library functions with no library constructor/destructor
   3
   4   Copyright (c) 2008-2009, Apple Inc. All rights reserved.
   5
   6   All rights reserved. This program and the accompanying materials
   7   are licensed and made available under the terms and conditions of the BSD License
   8   which accompanies this distribution.  The full text of the license may be found at
   9   http://opensource.org/licenses/bsd-license.php
  10
  11   THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
  12   WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
  13
  14 **/
  15
  16 #include <Base.h>
  17
  18
  19 #include <Library/SerialPortLib.h>
  20
  21 /*
  22
  23   Programmed hardware of Serial port.
  24
  25   @return    Always return EFI_UNSUPPORTED.
  26
  27 **/
  28 RETURN_STATUS
  29 EFIAPI
  30 SerialPortInitialize (
  31   VOID
  32   )
  33 {
  34   return RETURN_UNSUPPORTED;
  35 }
  36
  37 /**
  38   Write data to serial device.
  39
  40   @param  Buffer           Point of data buffer which need to be writed.
  41   @param  NumberOfBytes    Number of output bytes which are cached in Buffer.
  42
  43   @retval 0                Write data failed.
  44   @retval !0               Actual number of bytes writed to serial device.
  45
  46 **/
  47 UINTN
  48 EFIAPI
  49 SerialPortWrite (
  50   IN UINT8     *Buffer,
  51   IN UINTN     NumberOfBytes
  52 )
  53 {
  54   return 0;
  55 }
  56
  57
  58 /**
  59   Read data from serial device and save the datas in buffer.
  60
  61   @param  Buffer           Point of data buffer which need to be writed.
  62   @param  NumberOfBytes    Number of output bytes which are cached in Buffer.
  63
  64   @retval 0                Read data failed.
  65   @retval !0               Aactual number of bytes read from serial device.
  66
  67 **/
  68 UINTN
  69 EFIAPI
  70 SerialPortRead (
  71   OUT UINT8     *Buffer,
  72   IN  UINTN     NumberOfBytes
  73 )
  74 {
  75   return 0;
  76 }
  77
  78
  79
  80 /**
  81   Poll the serial device to see if there is any data waiting.
  82
  83   If there is data waiting to be read from the serial port, then return
  84   TRUE.  If there is no data waiting to be read from the serial port, then
  85   return FALSE.
  86
  87   @retval TRUE             Data is waiting to be read.
  88   @retval FALSE            There is no data waiting to be read.
  89
  90 **/
  91 BOOLEAN
  92 EFIAPI
  93 SerialPortPoll (
  94   VOID
  95   )
  96 {
  97   return 0;
  98 }
  99