/** @file
  Simple Text Input Ex protocol from the UEFI 2.0 specification.

  This protocol defines an extension to the EFI_SIMPLE_TEXT_INPUT_PROTOCOL
  which exposes much more state and modifier information from the input device,
  also allows one to register a notification for a particular keystroke.

  Copyright (c) 2006 - 2018, Intel Corporation. All rights reserved.<BR>
  SPDX-License-Identifier: BSD-2-Clause-Patent

**/

#pragma once

#include <Protocol/SimpleTextIn.h>

#define EFI_SIMPLE_TEXT_INPUT_EX_PROTOCOL_GUID \
  {0xdd9e7534, 0x7762, 0x4698, { 0x8c, 0x14, 0xf5, 0x85, 0x17, 0xa6, 0x25, 0xaa } }

typedef struct _EFI_SIMPLE_TEXT_INPUT_EX_PROTOCOL EFI_SIMPLE_TEXT_INPUT_EX_PROTOCOL;

/**
  The Reset() function resets the input device hardware. As part
  of initialization process, the firmware/device will make a quick
  but reasonable attempt to verify that the device is functioning.
  If the ExtendedVerification flag is TRUE the firmware may take
  an extended amount of time to verify the device is operating on
  reset. Otherwise the reset operation is to occur as quickly as
  possible. The hardware verification process is not defined by
  this specification and is left up to the platform firmware or
  driver to implement.

  @param This                 A pointer to the EFI_SIMPLE_TEXT_INPUT_EX_PROTOCOL instance.

  @param ExtendedVerification Indicates that the driver may
                              perform a more exhaustive
                              verification operation of the
                              device during reset.


  @retval EFI_SUCCESS       The device was reset.

  @retval EFI_DEVICE_ERROR  The device is not functioning
                            correctly and could not be reset.

**/
typedef
EFI_STATUS
(EFIAPI *EFI_INPUT_RESET_EX)(
  IN EFI_SIMPLE_TEXT_INPUT_EX_PROTOCOL *This,
  IN BOOLEAN                           ExtendedVerification
  );

///
/// EFI_KEY_TOGGLE_STATE. The toggle states are defined.
/// They are: EFI_TOGGLE_STATE_VALID, EFI_SCROLL_LOCK_ACTIVE
/// EFI_NUM_LOCK_ACTIVE, EFI_CAPS_LOCK_ACTIVE
///
typedef UINT8 EFI_KEY_TOGGLE_STATE;

typedef struct _EFI_KEY_STATE {
  ///
  /// Reflects the currently pressed shift
  /// modifiers for the input device. The
  /// returned value is valid only if the high
  /// order bit has been set.
  ///
  UINT32                  KeyShiftState;
  ///
  /// Reflects the current internal state of
  /// various toggled attributes. The returned
  /// value is valid only if the high order
  /// bit has been set.
  ///
  EFI_KEY_TOGGLE_STATE    KeyToggleState;
} EFI_KEY_STATE;

typedef struct {
  ///
  /// The EFI scan code and Unicode value returned from the input device.
  ///
  EFI_INPUT_KEY    Key;
  ///
  /// The current state of various toggled attributes as well as input modifier values.
  ///
  EFI_KEY_STATE    KeyState;
} EFI_KEY_DATA;

//
// Any Shift or Toggle State that is valid should have
// high order bit set.
//
// Shift state
//
#define EFI_SHIFT_STATE_VALID      0x80000000
#define EFI_RIGHT_SHIFT_PRESSED    0x00000001
#define EFI_LEFT_SHIFT_PRESSED     0x00000002
#define EFI_RIGHT_CONTROL_PRESSED  0x00000004
#define EFI_LEFT_CONTROL_PRESSED   0x00000008
#define EFI_RIGHT_ALT_PRESSED      0x00000010
#define EFI_LEFT_ALT_PRESSED       0x00000020
#define EFI_RIGHT_LOGO_PRESSED     0x00000040
#define EFI_LEFT_LOGO_PRESSED      0x00000080
#define EFI_MENU_KEY_PRESSED       0x00000100
#define EFI_SYS_REQ_PRESSED        0x00000200

//
// Toggle state
//
#define EFI_TOGGLE_STATE_VALID  0x80
#define EFI_KEY_STATE_EXPOSED   0x40
#define EFI_SCROLL_LOCK_ACTIVE  0x01
#define EFI_NUM_LOCK_ACTIVE     0x02
#define EFI_CAPS_LOCK_ACTIVE    0x04

//
// EFI Scan codes
//
#define SCAN_F11              0x0015
#define SCAN_F12              0x0016
#define SCAN_PAUSE            0x0048
#define SCAN_F13              0x0068
#define SCAN_F14              0x0069
#define SCAN_F15              0x006A
#define SCAN_F16              0x006B
#define SCAN_F17              0x006C
#define SCAN_F18              0x006D
#define SCAN_F19              0x006E
#define SCAN_F20              0x006F
#define SCAN_F21              0x0070
#define SCAN_F22              0x0071
#define SCAN_F23              0x0072
#define SCAN_F24              0x0073
#define SCAN_MUTE             0x007F
#define SCAN_VOLUME_UP        0x0080
#define SCAN_VOLUME_DOWN      0x0081
#define SCAN_BRIGHTNESS_UP    0x0100
#define SCAN_BRIGHTNESS_DOWN  0x0101
#define SCAN_SUSPEND          0x0102
#define SCAN_HIBERNATE        0x0103
#define SCAN_TOGGLE_DISPLAY   0x0104
#define SCAN_RECOVERY         0x0105
#define SCAN_EJECT            0x0106

/**
  The function reads the next keystroke from the input device. If
  there is no pending keystroke the function returns
  EFI_NOT_READY. If there is a pending keystroke, then
  KeyData.Key.ScanCode is the EFI scan code defined in Error!
  Reference source not found. The KeyData.Key.UnicodeChar is the
  actual printable character or is zero if the key does not
  represent a printable character (control key, function key,
  etc.). The KeyData.KeyState is shift state for the character
  reflected in KeyData.Key.UnicodeChar or KeyData.Key.ScanCode .
  When interpreting the data from this function, it should be
  noted that if a class of printable characters that are
  normally adjusted by shift modifiers (e.g. Shift Key + "f"
  key) would be presented solely as a KeyData.Key.UnicodeChar
  without the associated shift state. So in the previous example
  of a Shift Key + "f" key being pressed, the only pertinent
  data returned would be KeyData.Key.UnicodeChar with the value
  of "F". This of course would not typically be the case for
  non-printable characters such as the pressing of the Right
  Shift Key + F10 key since the corresponding returned data
  would be reflected both in the KeyData.KeyState.KeyShiftState
  and KeyData.Key.ScanCode values. UEFI drivers which implement
  the EFI_SIMPLE_TEXT_INPUT_EX protocol are required to return
  KeyData.Key and KeyData.KeyState values. These drivers must
  always return the most current state of
  KeyData.KeyState.KeyShiftState and
  KeyData.KeyState.KeyToggleState. It should also be noted that
  certain input devices may not be able to produce shift or toggle
  state information, and in those cases the high order bit in the
  respective Toggle and Shift state fields should not be active.


  @param This     A pointer to the EFI_SIMPLE_TEXT_INPUT_EX_PROTOCOL instance.

  @param KeyData  A pointer to a buffer that is filled in with
                  the keystroke state data for the key that was
                  pressed.


  @retval EFI_SUCCESS      The keystroke information was returned.
  @retval EFI_NOT_READY    There was no keystroke data available.
  @retval EFI_DEVICE_ERROR The keystroke information was not returned due to
                           hardware errors.
  @retval EFI_UNSUPPORTED  The device does not support the ability to read keystroke data.


**/
typedef
EFI_STATUS
(EFIAPI *EFI_INPUT_READ_KEY_EX)(
  IN  EFI_SIMPLE_TEXT_INPUT_EX_PROTOCOL *This,
  OUT EFI_KEY_DATA                      *KeyData
  );

/**
  The SetState() function allows the input device hardware to
  have state settings adjusted.

  @param This           A pointer to the EFI_SIMPLE_TEXT_INPUT_EX_PROTOCOL instance.

  @param KeyToggleState Pointer to the EFI_KEY_TOGGLE_STATE to
                        set the state for the input device.


  @retval EFI_SUCCESS       The device state was set appropriately.

  @retval EFI_DEVICE_ERROR  The device is not functioning
                            correctly and could not have the
                            setting adjusted.

  @retval EFI_UNSUPPORTED   The device does not support the
                            ability to have its state set.

**/
typedef
EFI_STATUS
(EFIAPI *EFI_SET_STATE)(
  IN EFI_SIMPLE_TEXT_INPUT_EX_PROTOCOL *This,
  IN EFI_KEY_TOGGLE_STATE              *KeyToggleState
  );

///
/// The function will be called when the key sequence is typed specified by KeyData.
///
typedef
EFI_STATUS
(EFIAPI *EFI_KEY_NOTIFY_FUNCTION)(
  IN EFI_KEY_DATA *KeyData
  );

/**
  The RegisterKeystrokeNotify() function registers a function
  which will be called when a specified keystroke will occur.

  @param This                     A pointer to the EFI_SIMPLE_TEXT_INPUT_EX_PROTOCOL instance.

  @param KeyData                  A pointer to a buffer that is filled in with
                                  the keystroke information for the key that was
                                  pressed. If KeyData.Key, KeyData.KeyState.KeyToggleState
                                  and KeyData.KeyState.KeyShiftState are 0, then any incomplete
                                  keystroke will trigger a notification of the KeyNotificationFunction.

  @param KeyNotificationFunction  Points to the function to be called when the key sequence
                                  is typed specified by KeyData. This notification function
                                  should be called at <=TPL_CALLBACK.


  @param NotifyHandle             Points to the unique handle assigned to
                                  the registered notification.

  @retval EFI_SUCCESS           Key notify was registered successfully.

  @retval EFI_OUT_OF_RESOURCES  Unable to allocate necessary
                                data structures.

**/
typedef
EFI_STATUS
(EFIAPI *EFI_REGISTER_KEYSTROKE_NOTIFY)(
  IN  EFI_SIMPLE_TEXT_INPUT_EX_PROTOCOL *This,
  IN  EFI_KEY_DATA                      *KeyData,
  IN  EFI_KEY_NOTIFY_FUNCTION           KeyNotificationFunction,
  OUT VOID                              **NotifyHandle
  );

/**
  The UnregisterKeystrokeNotify() function removes the
  notification which was previously registered.

  @param This               A pointer to the EFI_SIMPLE_TEXT_INPUT_EX_PROTOCOL instance.

  @param NotificationHandle The handle of the notification
                            function being unregistered.

  @retval EFI_SUCCESS           Key notify was unregistered successfully.

  @retval EFI_INVALID_PARAMETER The NotificationHandle is
                                invalid.

**/
typedef
EFI_STATUS
(EFIAPI *EFI_UNREGISTER_KEYSTROKE_NOTIFY)(
  IN EFI_SIMPLE_TEXT_INPUT_EX_PROTOCOL  *This,
  IN VOID                               *NotificationHandle
  );

///
/// The EFI_SIMPLE_TEXT_INPUT_EX_PROTOCOL is used on the ConsoleIn
/// device. It is an extension to the Simple Text Input protocol
/// which allows a variety of extended shift state information to be
/// returned.
///
struct _EFI_SIMPLE_TEXT_INPUT_EX_PROTOCOL {
  EFI_INPUT_RESET_EX                 Reset;
  EFI_INPUT_READ_KEY_EX              ReadKeyStrokeEx;
  ///
  /// Event to use with WaitForEvent() to wait for a key to be available.
  ///
  EFI_EVENT                          WaitForKeyEx;
  EFI_SET_STATE                      SetState;
  EFI_REGISTER_KEYSTROKE_NOTIFY      RegisterKeyNotify;
  EFI_UNREGISTER_KEYSTROKE_NOTIFY    UnregisterKeyNotify;
};

extern EFI_GUID  gEfiSimpleTextInputExProtocolGuid;