/**@file

  PS/2 Keyboard driver. Routines that interacts with callers,
  conforming to EFI driver model

Copyright (c) 2006 - 2007, Intel Corporation
All rights reserved. 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 "Ps2Keyboard.h"

//
// Function prototypes
//
EFI_STATUS
EFIAPI
KbdControllerDriverSupported (
  IN EFI_DRIVER_BINDING_PROTOCOL    *This,
  IN EFI_HANDLE                     Controller,
  IN EFI_DEVICE_PATH_PROTOCOL       *RemainingDevicePath
  );

EFI_STATUS
EFIAPI
KbdControllerDriverStart (
  IN EFI_DRIVER_BINDING_PROTOCOL    *This,
  IN EFI_HANDLE                     Controller,
  IN EFI_DEVICE_PATH_PROTOCOL       *RemainingDevicePath
  );

EFI_STATUS
EFIAPI
KbdControllerDriverStop (
  IN  EFI_DRIVER_BINDING_PROTOCOL    *This,
  IN  EFI_HANDLE                     Controller,
  IN  UINTN                          NumberOfChildren,
  IN  EFI_HANDLE                     *ChildHandleBuffer
  );

//
// Global variables
//
//
// DriverBinding Protocol Instance
//
EFI_DRIVER_BINDING_PROTOCOL gKeyboardControllerDriver = {
  KbdControllerDriverSupported,
  KbdControllerDriverStart,
  KbdControllerDriverStop,
  0xa,
  NULL,
  NULL
};

EFI_STATUS
EFIAPI
KbdControllerDriverSupported (
  IN EFI_DRIVER_BINDING_PROTOCOL    *This,
  IN EFI_HANDLE                     Controller,
  IN EFI_DEVICE_PATH_PROTOCOL       *RemainingDevicePath
  )
/*++

Routine Description:

  ControllerDriver Protocol Method

Arguments:

Returns:

--*/
// GC_TODO:    This - add argument and description to function comment
// GC_TODO:    Controller - add argument and description to function comment
// GC_TODO:    RemainingDevicePath - add argument and description to function comment
{
  EFI_STATUS                          Status;
  EFI_ISA_IO_PROTOCOL                 *IsaIo;

  //
  // Open the IO Abstraction(s) needed to perform the supported test
  //
  Status = gBS->OpenProtocol (
                  Controller,
                  &gEfiIsaIoProtocolGuid,
                  (VOID **) &IsaIo,
                  This->DriverBindingHandle,
                  Controller,
                  EFI_OPEN_PROTOCOL_BY_DRIVER
                  );
  if (EFI_ERROR (Status)) {
    return Status;
  }
  //
  // Use the ISA I/O Protocol to see if Controller is the Keyboard controller
  //
  if (IsaIo->ResourceList->Device.HID != EISA_PNP_ID (0x303) || IsaIo->ResourceList->Device.UID != 0) {
    Status = EFI_UNSUPPORTED;
  }
  //
  // Close the I/O Abstraction(s) used to perform the supported test
  //
  gBS->CloseProtocol (
         Controller,
         &gEfiIsaIoProtocolGuid,
         This->DriverBindingHandle,
         Controller
         );

  return Status;
}

EFI_STATUS
EFIAPI
KbdControllerDriverStart (
  IN EFI_DRIVER_BINDING_PROTOCOL    *This,
  IN EFI_HANDLE                     Controller,
  IN EFI_DEVICE_PATH_PROTOCOL       *RemainingDevicePath
  )
/*++

Routine Description:

Arguments:

Returns:

--*/
// GC_TODO:    This - add argument and description to function comment
// GC_TODO:    Controller - add argument and description to function comment
// GC_TODO:    RemainingDevicePath - add argument and description to function comment
// GC_TODO:    EFI_INVALID_PARAMETER - add return value to function comment
{
  EFI_STATUS                                Status;
  EFI_STATUS                                Status1;
  EFI_ISA_IO_PROTOCOL                       *IsaIo;
  KEYBOARD_CONSOLE_IN_DEV                   *ConsoleIn;
  UINT8                                     Data;
  EFI_STATUS_CODE_VALUE                     StatusCode;
  EFI_DEVICE_PATH_PROTOCOL                  *ParentDevicePath;

  StatusCode = 0;

  Status = gBS->OpenProtocol (
                  Controller,
                  &gEfiDevicePathProtocolGuid,
                  (VOID **) &ParentDevicePath,
                  This->DriverBindingHandle,
                  Controller,
                  EFI_OPEN_PROTOCOL_BY_DRIVER
                  );
  if (EFI_ERROR (Status)) {
    return Status;
  }
  //
  // Report that the keyboard is being enabled
  //
  REPORT_STATUS_CODE_WITH_DEVICE_PATH (
    EFI_PROGRESS_CODE,
    EFI_PERIPHERAL_KEYBOARD | EFI_P_PC_ENABLE,
    ParentDevicePath
    );

  //
  // Get the ISA I/O Protocol on Controller's handle
  //
  Status = gBS->OpenProtocol (
                  Controller,
                  &gEfiIsaIoProtocolGuid,
                  (VOID **) &IsaIo,
                  This->DriverBindingHandle,
                  Controller,
                  EFI_OPEN_PROTOCOL_BY_DRIVER
                  );
  if (EFI_ERROR (Status)) {
    gBS->CloseProtocol (
           Controller,
           &gEfiDevicePathProtocolGuid,
           This->DriverBindingHandle,
           Controller
           );
    return EFI_INVALID_PARAMETER;
  }
  //
  // Allocate private data
  //
  ConsoleIn = AllocateZeroPool (sizeof (KEYBOARD_CONSOLE_IN_DEV));
  if (ConsoleIn == NULL) {
    Status      = EFI_OUT_OF_RESOURCES;
    StatusCode  = EFI_PERIPHERAL_KEYBOARD | EFI_P_EC_CONTROLLER_ERROR;
    goto ErrorExit;
  }
  //
  // Setup the device instance
  //
  ConsoleIn->Signature              = KEYBOARD_CONSOLE_IN_DEV_SIGNATURE;
  ConsoleIn->Handle                 = Controller;
  (ConsoleIn->ConIn).Reset          = KeyboardEfiReset;
  (ConsoleIn->ConIn).ReadKeyStroke  = KeyboardReadKeyStroke;
  ConsoleIn->DataRegisterAddress    = KEYBOARD_8042_DATA_REGISTER;
  ConsoleIn->StatusRegisterAddress  = KEYBOARD_8042_STATUS_REGISTER;
  ConsoleIn->CommandRegisterAddress = KEYBOARD_8042_COMMAND_REGISTER;
  ConsoleIn->IsaIo                  = IsaIo;
  ConsoleIn->ScancodeBufStartPos    = 0;
  ConsoleIn->ScancodeBufEndPos      = KEYBOARD_BUFFER_MAX_COUNT - 1;
  ConsoleIn->ScancodeBufCount       = 0;
  ConsoleIn->Ctrled                 = FALSE;
  ConsoleIn->Alted                  = FALSE;
  ConsoleIn->DevicePath             = ParentDevicePath;

  //
  // Setup the WaitForKey event
  //
  Status = gBS->CreateEvent (
                  EVT_NOTIFY_WAIT,
                  TPL_NOTIFY,
                  KeyboardWaitForKey,
                  &(ConsoleIn->ConIn),
                  &((ConsoleIn->ConIn).WaitForKey)
                  );
  if (EFI_ERROR (Status)) {
    Status      = EFI_OUT_OF_RESOURCES;
    StatusCode  = EFI_PERIPHERAL_KEYBOARD | EFI_P_EC_CONTROLLER_ERROR;
    goto ErrorExit;
  }
  //
  // Setup a periodic timer, used for reading keystrokes at a fixed interval
  //
  Status = gBS->CreateEvent (
                  EVT_TIMER | EVT_NOTIFY_SIGNAL,
                  TPL_NOTIFY,
                  KeyboardTimerHandler,
                  ConsoleIn,
                  &ConsoleIn->TimerEvent
                  );
  if (EFI_ERROR (Status)) {
    Status      = EFI_OUT_OF_RESOURCES;
    StatusCode  = EFI_PERIPHERAL_KEYBOARD | EFI_P_EC_CONTROLLER_ERROR;
    goto ErrorExit;
  }

  Status = gBS->SetTimer (
                  ConsoleIn->TimerEvent,
                  TimerPeriodic,
                  KEYBOARD_TIMER_INTERVAL
                  );
  if (EFI_ERROR (Status)) {
    Status      = EFI_OUT_OF_RESOURCES;
    StatusCode  = EFI_PERIPHERAL_KEYBOARD | EFI_P_EC_CONTROLLER_ERROR;
    goto ErrorExit;
  }

  REPORT_STATUS_CODE_WITH_DEVICE_PATH (
    EFI_PROGRESS_CODE,
    EFI_PERIPHERAL_KEYBOARD | EFI_P_PC_PRESENCE_DETECT,
    ParentDevicePath
    );

  //
  // Reset the keyboard device
  //
  Status = ConsoleIn->ConIn.Reset (&ConsoleIn->ConIn, TRUE);
  if (EFI_ERROR (Status)) {
    Status      = EFI_DEVICE_ERROR;
    StatusCode  = EFI_PERIPHERAL_KEYBOARD | EFI_P_EC_NOT_DETECTED;
    goto ErrorExit;
  }

  ConsoleIn->ControllerNameTable = NULL;
  AddUnicodeString (
    "eng",
    gPs2KeyboardComponentName.SupportedLanguages,
    &ConsoleIn->ControllerNameTable,
    L"PS/2 Keyboard Device"
    );

  //
  // Install protocol interfaces for the keyboard device.
  //
  Status = gBS->InstallMultipleProtocolInterfaces (
                  &Controller,
                  &gEfiSimpleTextInProtocolGuid,
                  &ConsoleIn->ConIn,
                  NULL
                  );
  if (EFI_ERROR (Status)) {
    StatusCode = EFI_PERIPHERAL_KEYBOARD | EFI_P_EC_CONTROLLER_ERROR;
    goto ErrorExit;
  }

  return Status;

ErrorExit:
  //
  // Report error code
  //
  if (StatusCode != 0) {
    REPORT_STATUS_CODE_WITH_DEVICE_PATH (
      EFI_ERROR_CODE | EFI_ERROR_MINOR,
      StatusCode,
      ParentDevicePath
      );
  }

  if ((ConsoleIn != NULL) && (ConsoleIn->ConIn.WaitForKey != NULL)) {
    gBS->CloseEvent (ConsoleIn->ConIn.WaitForKey);
  }

  if ((ConsoleIn != NULL) && (ConsoleIn->TimerEvent != NULL)) {
    gBS->CloseEvent (ConsoleIn->TimerEvent);
  }

  if ((ConsoleIn != NULL) && (ConsoleIn->ControllerNameTable != NULL)) {
    FreeUnicodeStringTable (ConsoleIn->ControllerNameTable);
  }
  //
  // Since there will be no timer handler for keyboard input any more,
  // exhaust input data just in case there is still keyboard data left
  //
  Status1 = EFI_SUCCESS;
  while (!EFI_ERROR (Status1)) {
    Status1 = KeyboardRead (ConsoleIn, &Data);;
  }

  if (ConsoleIn != NULL) {
    gBS->FreePool (ConsoleIn);
  }

  gBS->CloseProtocol (
         Controller,
         &gEfiDevicePathProtocolGuid,
         This->DriverBindingHandle,
         Controller
         );

  gBS->CloseProtocol (
         Controller,
         &gEfiIsaIoProtocolGuid,
         This->DriverBindingHandle,
         Controller
         );

  return Status;
}

EFI_STATUS
EFIAPI
KbdControllerDriverStop (
  IN  EFI_DRIVER_BINDING_PROTOCOL    *This,
  IN  EFI_HANDLE                     Controller,
  IN  UINTN                          NumberOfChildren,
  IN  EFI_HANDLE                     *ChildHandleBuffer
  )
/*++

  Routine Description:

  Arguments:

  Returns:

--*/
// GC_TODO:    This - add argument and description to function comment
// GC_TODO:    Controller - add argument and description to function comment
// GC_TODO:    NumberOfChildren - add argument and description to function comment
// GC_TODO:    ChildHandleBuffer - add argument and description to function comment
// GC_TODO:    EFI_SUCCESS - add return value to function comment
{
  EFI_STATUS                     Status;
  EFI_SIMPLE_TEXT_INPUT_PROTOCOL *ConIn;
  KEYBOARD_CONSOLE_IN_DEV        *ConsoleIn;
  UINT8                          Data;

  //
  // Disable Keyboard
  //
  Status = gBS->OpenProtocol (
                  Controller,
                  &gEfiSimpleTextInProtocolGuid,
                  (VOID **) &ConIn,
                  This->DriverBindingHandle,
                  Controller,
                  EFI_OPEN_PROTOCOL_GET_PROTOCOL
                  );
  if (EFI_ERROR (Status)) {
    return Status;
  }

  ConsoleIn = KEYBOARD_CONSOLE_IN_DEV_FROM_THIS (ConIn);

  //
  // Report that the keyboard is being disabled
  //
  REPORT_STATUS_CODE_WITH_DEVICE_PATH (
    EFI_PROGRESS_CODE,
    EFI_PERIPHERAL_KEYBOARD | EFI_P_PC_DISABLE,
    ConsoleIn->DevicePath
    );

  if (ConsoleIn->TimerEvent) {
    gBS->CloseEvent (ConsoleIn->TimerEvent);
    ConsoleIn->TimerEvent = NULL;
  }
  //
  // Disable the keyboard interface
  //
  Status = DisableKeyboard (ConsoleIn);

  //
  // Since there will be no timer handler for keyboard input any more,
  // exhaust input data just in case there is still keyboard data left
  //
  Status = EFI_SUCCESS;
  while (!EFI_ERROR (Status)) {
    Status = KeyboardRead (ConsoleIn, &Data);;
  }
  //
  // Uninstall the Simple TextIn Protocol
  //
  Status = gBS->UninstallProtocolInterface (
                  Controller,
                  &gEfiSimpleTextInProtocolGuid,
                  &ConsoleIn->ConIn
                  );
  if (EFI_ERROR (Status)) {
    return Status;
  }

  gBS->CloseProtocol (
         Controller,
         &gEfiDevicePathProtocolGuid,
         This->DriverBindingHandle,
         Controller
         );

  gBS->CloseProtocol (
         Controller,
         &gEfiIsaIoProtocolGuid,
         This->DriverBindingHandle,
         Controller
         );

  //
  // Free other resources
  //
  if ((ConsoleIn->ConIn).WaitForKey) {
    gBS->CloseEvent ((ConsoleIn->ConIn).WaitForKey);
    (ConsoleIn->ConIn).WaitForKey = NULL;
  }

  FreeUnicodeStringTable (ConsoleIn->ControllerNameTable);
  gBS->FreePool (ConsoleIn);

  return EFI_SUCCESS;
}


/**
  The user Entry Point for module Ps2Keyboard. The user code starts with this function.

  @param[in] ImageHandle    The firmware allocated handle for the EFI image.  
  @param[in] SystemTable    A pointer to the EFI System Table.
  
  @retval EFI_SUCCESS       The entry point is executed successfully.
  @retval other             Some error occurs when executing this entry point.

**/
EFI_STATUS
EFIAPI
InitializePs2Keyboard(
  IN EFI_HANDLE           ImageHandle,
  IN EFI_SYSTEM_TABLE     *SystemTable
  )
{
  EFI_STATUS              Status;

  //
  // Install driver model protocol(s).
  //
  Status = EfiLibInstallAllDriverProtocols (
             ImageHandle,
             SystemTable,
             &gKeyboardControllerDriver,
             ImageHandle,
             &gPs2KeyboardComponentName,
             NULL,
             NULL
             );
  ASSERT_EFI_ERROR (Status);


  return Status;
}