DxeSmbusLib.c

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#include "InternalSmbusLib.h"
 
//
// Global variable to cache pointer to Smbus protocol.
//
EFI_SMBUS_HC_PROTOCOL  *mSmbus = NULL;
 
EFI_STATUS
EFIAPI
SmbusLibConstructor (
  IN EFI_HANDLE        ImageHandle,
  IN EFI_SYSTEM_TABLE  *SystemTable
  )
{
  EFI_STATUS  Status;
 
  Status = gBS->LocateProtocol (&gEfiSmbusHcProtocolGuid, NULL, (VOID **)&mSmbus);
  ASSERT_EFI_ERROR (Status);
  ASSERT (mSmbus != NULL);
 
  return Status;
}
 
UINTN
InternalSmBusExec (
  IN     EFI_SMBUS_OPERATION  SmbusOperation,
  IN     UINTN                SmBusAddress,
  IN     UINTN                Length,
  IN OUT VOID                 *Buffer,
  OUT RETURN_STATUS           *Status        OPTIONAL
  )
{
  RETURN_STATUS             ReturnStatus;
  EFI_SMBUS_DEVICE_ADDRESS  SmbusDeviceAddress;
 
  SmbusDeviceAddress.SmbusDeviceAddress = SMBUS_LIB_SLAVE_ADDRESS (SmBusAddress);
 
  ReturnStatus = mSmbus->Execute (
                           mSmbus,
                           SmbusDeviceAddress,
                           SMBUS_LIB_COMMAND (SmBusAddress),
                           SmbusOperation,
                           SMBUS_LIB_PEC (SmBusAddress),
                           &Length,
                           Buffer
                           );
  if (Status != NULL) {
    *Status = ReturnStatus;
  }
 
  return Length;
}