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#include <Protocol\CpuIo.h>
#include <AmiDxeLib.h>
#include "KscLib.h"
EFI_CPU_IO_PROTOCOL *mDxeKscLibCpuIo;
BOOLEAN mDxeKscLibInitialized = FALSE;
extern EFI_BOOT_SERVICES *pBS;
//
// Function implemenations
//
EFI_STATUS
InitializeKscLib (
VOID
)
/*++
Routine Description:
Initialize the library.
The DXE library only requires CPU IO protocol, so this will locate CPU IO protocol
and save it for future use.
Arguments:
None.
Returns:
EFI_SUCCESS - KscLib is successfully initialized.
--*/
{
EFI_STATUS Status;
UINT8 Data;
//
// Locate CpuIo protocol
//
Status = pBS->LocateProtocol (&gEfiCpuIoProtocolGuid, NULL, &mDxeKscLibCpuIo);
ASSERT_EFI_ERROR (Status);
//
// Fail if EC doesn't exist.
//
mDxeKscLibCpuIo->Io.Read (mDxeKscLibCpuIo, EfiCpuIoWidthUint8, KSC_C_PORT, 1, &Data);
if(Data == 0xff){
mDxeKscLibInitialized = FALSE;
Status = EFI_DEVICE_ERROR;
} else {
mDxeKscLibInitialized = TRUE;
Status = EFI_SUCCESS;
}
return Status;
}
EFI_STATUS
SendKscCommand (
UINT8 Command
)
/*++
Routine Description:
Sends command to Keyboard System Controller.
Arguments:
Command - Command byte to send
Returns:
EFI_SUCCESS - Command success
EFI_DEVICE_ERROR - Command error
--*/
{
UINTN Index;
UINT8 KscStatus;
EFI_STATUS Status;
KscStatus = 0;
Index = 0;
//
// Locate CpuIo protocol
//
Status = pBS->LocateProtocol (&gEfiCpuIoProtocolGuid, NULL, &mDxeKscLibCpuIo);
ASSERT_EFI_ERROR (Status);
//
// Wait for KSC to be ready (with a timeout)
//
ReceiveKscStatus (&KscStatus);
while (((KscStatus & KSC_S_IBF) != 0) && (Index < KSC_TIME_OUT)) {
pBS->Stall (15);
ReceiveKscStatus (&KscStatus);
Index++;
}
if (Index >= KSC_TIME_OUT) {
return EFI_DEVICE_ERROR;
}
//
// Send the KSC command
//
Status = mDxeKscLibCpuIo->Io.Write (
mDxeKscLibCpuIo,
EfiCpuIoWidthUint8,
KSC_C_PORT,
1,
&Command
);
ASSERT_EFI_ERROR (Status);
return EFI_SUCCESS;
}
EFI_STATUS
ReceiveKscStatus (
UINT8 *KscStatus
)
/*++
Routine Description:
Receives status from Keyboard System Controller.
Arguments:
Status - Status byte to receive
Returns:
EFI_SUCCESS - Always success
--*/
{
EFI_STATUS Status = EFI_SUCCESS;
//
// Locate CpuIo protocol
//
Status = pBS->LocateProtocol (&gEfiCpuIoProtocolGuid, NULL, &mDxeKscLibCpuIo);
ASSERT_EFI_ERROR (Status);
//
// Read and return the status
//
Status = mDxeKscLibCpuIo->Io.Read (
mDxeKscLibCpuIo,
EfiCpuIoWidthUint8,
KSC_C_PORT,
1,
KscStatus
);
ASSERT_EFI_ERROR (Status);
return EFI_SUCCESS;
}
EFI_STATUS
SendKscData (
UINT8 Data
)
/*++
Routine Description:
Sends data to Keyboard System Controller.
Arguments:
Data - Data byte to send
Returns:
EFI_SUCCESS - Success
EFI_TIMEOUT - Timeout
Other - Failed
--*/
{
UINTN Index;
UINT8 KscStatus;
EFI_STATUS Status = EFI_SUCCESS;
Index = 0;
//
// Locate CpuIo protocol
//
Status = pBS->LocateProtocol (&gEfiCpuIoProtocolGuid, NULL, &mDxeKscLibCpuIo);
ASSERT_EFI_ERROR (Status);
//
// Wait for KSC to be ready (with a timeout)
//
ReceiveKscStatus (&KscStatus);
while (((KscStatus & KSC_S_IBF) != 0) && (Index < KSC_TIME_OUT)) {
pBS->Stall (15);
ReceiveKscStatus (&KscStatus);
Index++;
}
if (Index >= KSC_TIME_OUT) {
return EFI_DEVICE_ERROR;
}
//
// Send the data and return
//
Status = mDxeKscLibCpuIo->Io.Write (
mDxeKscLibCpuIo,
EfiCpuIoWidthUint8,
KSC_D_PORT,
1,
&Data
);
ASSERT_EFI_ERROR (Status);
return EFI_SUCCESS;
}
EFI_STATUS
ReceiveKscData (
UINT8 *Data
)
/*++
Routine Description:
Receives data from Keyboard System Controller.
Arguments:
Data - Data byte received
Returns:
EFI_SUCCESS - Read success
EFI_DEVICE_ERROR - Read error
--*/
{
UINTN Index;
UINT8 KscStatus;
EFI_STATUS Status = EFI_SUCCESS;
Index = 0;
//
// Locate CpuIo protocol
//
Status = pBS->LocateProtocol (&gEfiCpuIoProtocolGuid, NULL, &mDxeKscLibCpuIo);
ASSERT_EFI_ERROR (Status);
//
// Wait for KSC to be ready (with a timeout)
//
ReceiveKscStatus (&KscStatus);
while (((KscStatus & KSC_S_OBF) == 0) && (Index < KSC_TIME_OUT)) {
pBS->Stall (15);
ReceiveKscStatus (&KscStatus);
Index++;
}
if (Index >= KSC_TIME_OUT) {
return EFI_DEVICE_ERROR;
}
//
// Read KSC data and return
//
Status = mDxeKscLibCpuIo->Io.Read (
mDxeKscLibCpuIo,
EfiCpuIoWidthUint8,
KSC_D_PORT,
1,
Data
);
ASSERT_EFI_ERROR (Status);
return EFI_SUCCESS;
}
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