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Diffstat (limited to 'include/ec/gpio.h')
-rw-r--r-- | include/ec/gpio.h | 53 |
1 files changed, 53 insertions, 0 deletions
diff --git a/include/ec/gpio.h b/include/ec/gpio.h new file mode 100644 index 00000000..82a9343a --- /dev/null +++ b/include/ec/gpio.h @@ -0,0 +1,53 @@ +/* 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_ |