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/** @file
Boot service DXE KSC library implementation.
Copyright (c) 1999 - 2015, Intel Corporation. All rights reserved.<BR>
This program and the accompanying materials
are licensed and made available under the terms and conditions of the BSD License
which accompanies this distribution. The full text of the license may be found at
http://opensource.org/licenses/bsd-license.php.
THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
**/
#include "KscLib.h"
#include "DxeKsclib.h"
BOOLEAN mDxeKscLibInitialized = FALSE;
//
// Function implemenations
//
/**
Initialize the library.
Read KSC Command port (0x66), if found 0xff means no EC exists else EC exists
@return EFI_SUCCESS KscLib is successfully initialized.
**/
EFI_STATUS
InitializeKscLib (
VOID
)
{
if (IoRead8(KSC_C_PORT) == 0xff) {
mDxeKscLibInitialized = FALSE;
return EFI_DEVICE_ERROR; // EC Doesn't exists
}
mDxeKscLibInitialized = TRUE;
return EFI_SUCCESS; // EC exists
}
/**
Sends command to Keyboard System Controller.
@param Command Command byte to send
@retval EFI_SUCCESS Command success
@retval EFI_DEVICE_ERROR Command error
**/
EFI_STATUS
SendKscCommand (
UINT8 Command
)
{
UINTN Index;
UINT8 KscStatus = 0;
Index = 0;
//
// Wait for KSC to be ready (with a timeout)
//
ReceiveKscStatus (&KscStatus);
while (((KscStatus & KSC_S_IBF) != 0) && (Index < KSC_TIME_OUT)) {
gBS->Stall (15);
ReceiveKscStatus (&KscStatus);
Index++;
}
if (Index >= KSC_TIME_OUT) {
return EFI_DEVICE_ERROR;
}
//
// Send the KSC command
//
DEBUG ((EFI_D_INFO, "SendKscCommand: command = %x\n", Command));
IoWrite8(KSC_C_PORT, Command);
return EFI_SUCCESS;
}
/**
Receives status from Keyboard System Controller.
@param Status Status byte to receive
@retval EFI_SUCCESS Always success
**/
EFI_STATUS
ReceiveKscStatus (
UINT8 *KscStatus
)
{
//
// Read and return the status
//
*KscStatus = IoRead8(KSC_C_PORT);
return EFI_SUCCESS;
}
/**
Sends data to Keyboard System Controller.
@param Data Data byte to send
@retval EFI_SUCCESS Success
@retval EFI_TIMEOUT Timeout
@retval Other Failed
**/
EFI_STATUS
SendKscData (
UINT8 Data
)
{
UINTN Index;
UINT8 KscStatus;
Index = 0;
//
// Wait for KSC to be ready (with a timeout)
//
ReceiveKscStatus (&KscStatus);
while (((KscStatus & KSC_S_IBF) != 0) && (Index < KSC_TIME_OUT)) {
gBS->Stall (15);
ReceiveKscStatus (&KscStatus);
Index++;
}
if (Index >= KSC_TIME_OUT) {
return EFI_DEVICE_ERROR;
}
IoWrite8(KSC_D_PORT, Data);
return EFI_SUCCESS;
}
/**
Receives data from Keyboard System Controller.
@param Data Data byte received
@retval EFI_SUCCESS Read success
@retval EFI_DEVICE_ERROR Read error
**/
EFI_STATUS
ReceiveKscData (
UINT8 *Data
)
{
UINTN Index;
UINT8 KscStatus;
Index = 0;
//
// Wait for KSC to be ready (with a timeout)
//
ReceiveKscStatus (&KscStatus);
while (((KscStatus & KSC_S_OBF) == 0) && (Index < KSC_TIME_OUT)) {
gBS->Stall (15);
ReceiveKscStatus (&KscStatus);
Index++;
}
if (Index >= KSC_TIME_OUT) {
return EFI_DEVICE_ERROR;
}
//
// Read KSC data and return
//
*Data = IoRead8(KSC_D_PORT);
return EFI_SUCCESS;
}
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