1 /** 2 * Copyright © 2020 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 "i2c_compare_bytes_action.hpp" 18 19 #include "action_error.hpp" 20 #include "i2c_interface.hpp" 21 22 #include <exception> 23 #include <ios> 24 #include <sstream> 25 26 namespace phosphor::power::regulators 27 { 28 29 bool I2CCompareBytesAction::execute(ActionEnvironment& environment) 30 { 31 bool isEqual{true}; 32 try 33 { 34 // Read actual device register values. Use I2C mode where the number of 35 // bytes to read is explicitly specified. 36 i2c::I2CInterface& interface = getI2CInterface(environment); 37 uint8_t size = values.size(); 38 uint8_t actualValues[UINT8_MAX]; 39 interface.read(reg, size, actualValues, i2c::I2CInterface::Mode::I2C); 40 41 // Compare actual byte values to expected byte values 42 for (unsigned int i = 0; i < values.size(); ++i) 43 { 44 if ((actualValues[i] & masks[i]) != values[i]) 45 { 46 isEqual = false; 47 break; 48 } 49 } 50 } 51 catch (const i2c::I2CException& e) 52 { 53 // Nest I2CException within an ActionError so caller will have both the 54 // low level I2C error information and the action information 55 std::throw_with_nested(ActionError(*this)); 56 } 57 return isEqual; 58 } 59 60 std::string I2CCompareBytesAction::toString() const 61 { 62 std::ostringstream ss; 63 ss << "i2c_compare_bytes: { register: 0x" << std::hex << std::uppercase 64 << static_cast<uint16_t>(reg) << ", values: [ "; 65 for (unsigned int i = 0; i < values.size(); ++i) 66 { 67 ss << ((i > 0) ? ", " : "") << "0x" << static_cast<uint16_t>(values[i]); 68 } 69 ss << " ], masks: [ "; 70 for (unsigned int i = 0; i < masks.size(); ++i) 71 { 72 ss << ((i > 0) ? ", " : "") << "0x" << static_cast<uint16_t>(masks[i]); 73 } 74 ss << " ] }"; 75 return ss.str(); 76 } 77 78 } // namespace phosphor::power::regulators 79