include/ec/gpio.h

/* 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_