53 lines
1.4 KiB
C
53 lines
1.4 KiB
C
/* Copyright 2013-2014 Google Corp.
|
|
*
|
|
* Licensed under the Apache License, Version 2.0 (the "License");
|
|
* you may not use this file except in compliance with the License.
|
|
* You may obtain a copy of the License at
|
|
*
|
|
* http://www.apache.org/licenses/LICENSE-2.0
|
|
*
|
|
* Unless required by applicable law or agreed to in writing, software
|
|
* distributed under the License is distributed on an "AS IS" BASIS,
|
|
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
|
|
* implied.
|
|
* See the License for the specific language governing permissions and
|
|
* limitations under the License.
|
|
*/
|
|
/**
|
|
* @file gpio.h
|
|
*
|
|
* @brief Public interface of the EC GPIO device driver
|
|
*
|
|
*/
|
|
|
|
#ifndef __EC_GPIO_H_
|
|
#define __EC_GPIO_H_
|
|
|
|
#ifdef __cplusplus
|
|
extern "C" {
|
|
#endif
|
|
|
|
#define EC_GPIO_INPUT 0
|
|
#define EC_GPIO_OUTPUT 1
|
|
#define EC_GPIO_PULLUP_DISABLE 0
|
|
#define EC_GPIO_PULLUP_ENABLE 1
|
|
|
|
// Sets up a GPIO as output or input.
|
|
// Returns: <0 on error
|
|
int ec_gpio_setup(EcGpioPort port, uint8_t pin,
|
|
int is_output, int pullup_enable);
|
|
|
|
// Reads the current value of an input GPIO.
|
|
// Returns: GPIO value (0,1) or <0 on error.
|
|
int ec_gpio_read(EcGpioPort port, uint8_t pin);
|
|
|
|
// Sets the driving value of an output GPIO. Port should already be set
|
|
// to output mode.
|
|
// Returns: <0 on error
|
|
int ec_gpio_set(EcGpioPort port, uint8_t pin, int val);
|
|
|
|
#ifdef __cplusplus
|
|
}
|
|
#endif
|
|
|
|
#endif // __EC_GPIO_H_
|