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/** @file
Copyright (c) 2008 - 2009, Apple Inc. 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.
**/
#ifndef __EMBEDDED_GPIO_H__
#define __EMBEDDED_GPIO_H__
//
// Protocol interface structure
//
typedef struct _EMBEDDED_GPIO EMBEDDED_GPIO;
//
// Data Types
//
typedef UINTN EMBEDDED_GPIO_PIN;
#define GPIO(Port, Pin) ((EMBEDDED_GPIO_PIN)(((Port) << (16)) | (Pin)))
#define GPIO_PIN(x) ((EMBEDDED_GPIO_PIN)(x) & (0xFFFF))
#define GPIO_PORT(x) ((EMBEDDED_GPIO_PIN)(x) >> (16))
typedef enum {
GPIO_MODE_INPUT = 0x00,
GPIO_MODE_OUTPUT_0 = 0x0E,
GPIO_MODE_OUTPUT_1 = 0x0F,
GPIO_MODE_SPECIAL_FUNCTION_2 = 0x02,
GPIO_MODE_SPECIAL_FUNCTION_3 = 0x03,
GPIO_MODE_SPECIAL_FUNCTION_4 = 0x04,
GPIO_MODE_SPECIAL_FUNCTION_5 = 0x05,
GPIO_MODE_SPECIAL_FUNCTION_6 = 0x06,
GPIO_MODE_SPECIAL_FUNCTION_7 = 0x07
} EMBEDDED_GPIO_MODE;
typedef enum {
GPIO_PULL_NONE,
GPIO_PULL_UP,
GPIO_PULL_DOWN
} EMBEDDED_GPIO_PULL;
//
// Function Prototypes
//
typedef
EFI_STATUS
(EFIAPI *EMBEDDED_GPIO_GET) (
IN EMBEDDED_GPIO *This,
IN EMBEDDED_GPIO_PIN Gpio,
OUT UINTN *Value
);
/*++
Routine Description:
Gets the state of a GPIO pin
Arguments:
This - pointer to protocol
Gpio - which pin to read
Value - state of the pin
Returns:
EFI_SUCCESS - GPIO state returned in Value
--*/
typedef
EFI_STATUS
(EFIAPI *EMBEDDED_GPIO_SET) (
IN EMBEDDED_GPIO *This,
IN EMBEDDED_GPIO_PIN Gpio,
IN EMBEDDED_GPIO_MODE Mode
);
/*++
Routine Description:
Sets the state of a GPIO pin
Arguments:
This - pointer to protocol
Gpio - which pin to modify
Mode - mode to set
Returns:
EFI_SUCCESS - GPIO set as requested
--*/
typedef
EFI_STATUS
(EFIAPI *EMBEDDED_GPIO_GET_MODE) (
IN EMBEDDED_GPIO *This,
IN EMBEDDED_GPIO_PIN Gpio,
OUT EMBEDDED_GPIO_MODE *Mode
);
/*++
Routine Description:
Gets the mode (function) of a GPIO pin
Arguments:
This - pointer to protocol
Gpio - which pin
Mode - pointer to output mode value
Returns:
EFI_SUCCESS - mode value retrieved
--*/
typedef
EFI_STATUS
(EFIAPI *EMBEDDED_GPIO_SET_PULL) (
IN EMBEDDED_GPIO *This,
IN EMBEDDED_GPIO_PIN Gpio,
IN EMBEDDED_GPIO_PULL Direction
);
/*++
Routine Description:
Sets the pull-up / pull-down resistor of a GPIO pin
Arguments:
This - pointer to protocol
Gpio - which pin
Direction - pull-up, pull-down, or none
Returns:
EFI_SUCCESS - pin was set
--*/
struct _EMBEDDED_GPIO {
EMBEDDED_GPIO_GET Get;
EMBEDDED_GPIO_SET Set;
EMBEDDED_GPIO_GET_MODE GetMode;
EMBEDDED_GPIO_SET_PULL SetPull;
};
extern EFI_GUID gEmbeddedGpioProtocolGuid;
#endif
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