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/** @file
SMM 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 "SmmKscLib.h"
BOOLEAN mSmmKscLibInitialized = FALSE;
//
// Function implemenations
//
/**
Initialize the library.
The SMM library only requires SMM IO library and has no initialization.
However, this must be called prior to use of any other KSC library functions
for future compatibility.
@Return EFI_SUCCESS KscLib is successfully initialized.
**/
EFI_STATUS
InitializeKscLib (
VOID
)
{
//
// Fail if EC doesn't exist.
//
if (SmmIoRead8(KSC_C_PORT) == 0xff) {
mSmmKscLibInitialized = FALSE;
return EFI_DEVICE_ERROR;
}
mSmmKscLibInitialized = TRUE;
return EFI_SUCCESS;
}
/**
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;
//
// Verify if KscLib has been initialized, NOT if EC dose not exist.
//
if (mSmmKscLibInitialized == FALSE) {
return EFI_DEVICE_ERROR;
}
Index = 0;
//
// Wait for KSC to be ready (with a timeout)
//
ReceiveKscStatus (&KscStatus);
while (((KscStatus & KSC_S_IBF) != 0) && (Index < KSC_TIME_OUT)) {
SmmStall (15);
ReceiveKscStatus (&KscStatus);
Index++;
}
if (Index >= KSC_TIME_OUT) {
return EFI_DEVICE_ERROR;
}
//
// Send the KSC command
//
SmmIoWrite8 (KSC_C_PORT, Command);
return EFI_SUCCESS;
}
/**
Receives status from Keyboard System Controller.
@param KscStatus Status byte to receive
@Return EFI_SUCCESS Always success
**/
EFI_STATUS
ReceiveKscStatus (
UINT8 *KscStatus
)
{
//
// Verify if KscLib has been initialized, NOT if EC dose not exist.
//
if (mSmmKscLibInitialized == FALSE) {
return EFI_DEVICE_ERROR;
}
//
// Read and return the status
//
*KscStatus = SmmIoRead8 (KSC_C_PORT);
return EFI_SUCCESS;
}
/**
Sends data to Keyboard System Controller.
@param Data Data byte to send
@retval EFI_SUCCESS Success
@retval EFI_DEVICE_ERROR Error
**/
EFI_STATUS
SendKscData (
UINT8 Data
)
{
UINTN Index;
UINT8 KscStatus;
//
// Verify if KscLib has been initialized, NOT if EC dose not exist.
//
if (mSmmKscLibInitialized == FALSE) {
return EFI_DEVICE_ERROR;
}
Index = 0;
//
// Wait for KSC to be ready (with a timeout)
//
ReceiveKscStatus (&KscStatus);
while (((KscStatus & KSC_S_IBF) != 0) && (Index < KSC_TIME_OUT)) {
SmmStall (15);
ReceiveKscStatus (&KscStatus);
Index++;
}
if (Index >= KSC_TIME_OUT) {
return EFI_DEVICE_ERROR;
}
//
// Send the data and return
//
SmmIoWrite8 (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;
//
// Verify if KscLib has been initialized, NOT if EC dose not exist.
//
if (mSmmKscLibInitialized == FALSE) {
return EFI_DEVICE_ERROR;
}
Index = 0;
//
// Wait for KSC to be ready (with a timeout)
//
ReceiveKscStatus (&KscStatus);
while (((KscStatus & KSC_S_OBF) == 0) && (Index < KSC_TIME_OUT)) {
SmmStall (15);
ReceiveKscStatus (&KscStatus);
Index++;
}
if (Index >= KSC_TIME_OUT) {
return EFI_DEVICE_ERROR;
}
//
// Read KSC data and return
//
*Data = SmmIoRead8 (KSC_D_PORT);
return EFI_SUCCESS;
}
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