| /* 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_ |