1 /* 2 // Copyright (c) 2018 Intel Corporation 3 // 4 // Licensed under the Apache License, Version 2.0 (the "License"); 5 // you may not use this file except in compliance with the License. 6 // You may obtain a copy of the License at 7 // 8 // http://www.apache.org/licenses/LICENSE-2.0 9 // 10 // Unless required by applicable law or agreed to in writing, software 11 // distributed under the License is distributed on an "AS IS" BASIS, 12 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 // See the License for the specific language governing permissions and 14 // limitations under the License. 15 */ 16 #pragma once 17 18 #include <nlohmann/json.hpp> 19 #include <sdbusplus/bus.hpp> 20 21 #include <string> 22 #include <vector> 23 24 enum class GpioState 25 { 26 low, 27 high 28 }; 29 30 // this struct has the gpio config for single gpio 31 struct gpioInfo 32 { 33 int fd; // io fd mapped with the gpio 34 uint32_t number; 35 std::string direction; 36 }; 37 38 // this struct represents button interface 39 struct buttonConfig 40 { 41 std::string formFactorName; // name of the button interface 42 std::vector<gpioInfo> gpios; // holds single or group gpio config 43 nlohmann::json extraJsonInfo; // corresponding to button interface 44 }; 45 46 /** 47 * @brief iterates over the list of gpios and configures gpios them 48 * config which is set from gpio defs json file. 49 * The fd of the configured gpio is stored in buttonConfig.gpios container 50 * @return int returns 0 on successful config of all gpios 51 */ 52 53 int configGroupGpio(buttonConfig& buttonCfg); 54 55 /** 56 * @brief configures and initializes the single gpio 57 * @return int returns 0 on successful config of all gpios 58 */ 59 60 int configGpio(gpioInfo& gpioConfig); 61 62 uint32_t getGpioNum(const std::string& gpioPin); 63 void closeGpio(int fd); 64 // global json object which holds gpio_defs.json configs 65 extern nlohmann::json gpioDefs; 66