1 /* 2 // Copyright (c) 2019 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 17 #pragma once 18 #include <experimental/filesystem> 19 20 class SPIDev 21 { 22 private: 23 int fd = -1; 24 25 public: 26 SPIDev() = delete; 27 SPIDev(const SPIDev&) = delete; 28 SPIDev& operator=(const SPIDev&) = delete; 29 SPIDev(SPIDev&&) = delete; 30 SPIDev& operator=(SPIDev&&) = delete; 31 SPIDev(const std::string & spiDev)32 SPIDev(const std::string& spiDev) : 33 fd(open(spiDev.c_str(), O_RDWR | O_CLOEXEC)) 34 { 35 if (fd < 0) 36 { 37 std::string msg = "Unable to open mtd device. errno=" + 38 std::string(std::strerror(errno)); 39 throw std::runtime_error(msg); 40 } 41 } 42 ~SPIDev()43 virtual ~SPIDev() 44 { 45 if (!(fd < 0)) 46 { 47 close(fd); 48 } 49 } 50 spiReadData(uint32_t startAddr,size_t dataLen,void * dataRes)51 void spiReadData(uint32_t startAddr, size_t dataLen, void* dataRes) 52 { 53 if (lseek(fd, startAddr, SEEK_SET) < 0) 54 { 55 std::string msg = "Failed to do lseek on mtd device. errno=" + 56 std::string(std::strerror(errno)); 57 throw std::runtime_error(msg); 58 } 59 60 if (read(fd, dataRes, dataLen) != static_cast<ssize_t>(dataLen)) 61 { 62 std::string msg = "Failed to read on mtd device. errno=" + 63 std::string(std::strerror(errno)); 64 throw std::runtime_error(msg); 65 } 66 67 return; 68 } 69 }; 70