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_bit_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 execute(ActionEnvironment & environment)29bool I2CCompareBitAction::execute(ActionEnvironment& environment) 30 { 31 bool isEqual{false}; 32 try 33 { 34 // Read actual value of device register 35 uint8_t registerValue{0x00}; 36 i2c::I2CInterface& interface = getI2CInterface(environment); 37 interface.read(reg, registerValue); 38 39 // Get actual bit value 40 uint8_t actualValue = (registerValue >> position) & 0x01; 41 42 // Check if actual bit value equals expected bit value 43 isEqual = (actualValue == value); 44 } 45 catch (const i2c::I2CException& e) 46 { 47 // Nest I2CException within an ActionError so caller will have both the 48 // low level I2C error information and the action information 49 std::throw_with_nested(ActionError(*this)); 50 } 51 return isEqual; 52 } 53 toString() const54std::string I2CCompareBitAction::toString() const 55 { 56 std::ostringstream ss; 57 ss << "i2c_compare_bit: { register: 0x" << std::hex << std::uppercase 58 << static_cast<uint16_t>(reg) << ", position: " << std::dec 59 << static_cast<uint16_t>(position) 60 << ", value: " << static_cast<uint16_t>(value) << " }"; 61 return ss.str(); 62 } 63 64 } // namespace phosphor::power::regulators 65