1 /** 2 * Copyright © 2019 IBM 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 17 #include "sysfs.hpp" 18 19 #include <fstream> 20 #include <iostream> 21 #include <string> 22 23 namespace fs = std::filesystem; 24 25 namespace phosphor 26 { 27 namespace led 28 { 29 30 constexpr char SysfsLed::BRIGHTNESS[]; 31 constexpr char SysfsLed::MAX_BRIGHTNESS[]; 32 constexpr char SysfsLed::TRIGGER[]; 33 constexpr char SysfsLed::DELAY_ON[]; 34 constexpr char SysfsLed::DELAY_OFF[]; 35 36 template <typename T> 37 T get_sysfs_attr(const fs::path& path); 38 39 template <> 40 std::string get_sysfs_attr(const fs::path& path) 41 { 42 std::string content; 43 std::ifstream file(path); 44 file >> content; 45 return content; 46 } 47 48 template <> 49 unsigned long get_sysfs_attr(const fs::path& path) 50 { 51 std::string content = get_sysfs_attr<std::string>(std::move(path)); 52 return std::strtoul(content.c_str(), nullptr, 0); 53 } 54 55 template <typename T> 56 void set_sysfs_attr(const fs::path& path, const T& value) 57 { 58 std::ofstream file(path); 59 file << value; 60 } 61 62 unsigned long SysfsLed::getBrightness() 63 { 64 return get_sysfs_attr<unsigned long>(root / BRIGHTNESS); 65 } 66 67 void SysfsLed::setBrightness(unsigned long brightness) 68 { 69 set_sysfs_attr<unsigned long>(root / BRIGHTNESS, brightness); 70 } 71 72 unsigned long SysfsLed::getMaxBrightness() 73 { 74 return get_sysfs_attr<unsigned long>(root / MAX_BRIGHTNESS); 75 } 76 77 std::string SysfsLed::getTrigger() 78 { 79 return get_sysfs_attr<std::string>(root / TRIGGER); 80 } 81 82 void SysfsLed::setTrigger(const std::string& trigger) 83 { 84 set_sysfs_attr<std::string>(root / TRIGGER, trigger); 85 } 86 87 unsigned long SysfsLed::getDelayOn() 88 { 89 return get_sysfs_attr<unsigned long>(root / DELAY_ON); 90 } 91 92 void SysfsLed::setDelayOn(unsigned long ms) 93 { 94 set_sysfs_attr<unsigned long>(root / DELAY_ON, ms); 95 } 96 97 unsigned long SysfsLed::getDelayOff() 98 { 99 return get_sysfs_attr<unsigned long>(root / DELAY_OFF); 100 } 101 102 void SysfsLed::setDelayOff(unsigned long ms) 103 { 104 set_sysfs_attr<unsigned long>(root / DELAY_OFF, ms); 105 } 106 } // namespace led 107 } // namespace phosphor 108