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_write_byte_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 I2CWriteByteAction::execute(ActionEnvironment& environment) 30 { 31 try 32 { 33 i2c::I2CInterface& interface = getI2CInterface(environment); 34 uint8_t valueToWrite; 35 if (mask == 0xFF) 36 { 37 valueToWrite = value; 38 } 39 else 40 { 41 // Read current value of device register 42 uint8_t currentValue{0x00}; 43 interface.read(reg, currentValue); 44 45 // Combine value to write with current value 46 valueToWrite = (value & mask) | (currentValue & (~mask)); 47 } 48 49 // Write value to device register 50 interface.write(reg, valueToWrite); 51 } 52 catch (const i2c::I2CException& e) 53 { 54 // Nest I2CException within an ActionError so caller will have both the 55 // low level I2C error information and the action information 56 std::throw_with_nested(ActionError(*this)); 57 } 58 return true; 59 } 60 toString() const61std::string I2CWriteByteAction::toString() const 62 { 63 std::ostringstream ss; 64 ss << "i2c_write_byte: { register: 0x" << std::hex << std::uppercase 65 << static_cast<uint16_t>(reg) << ", value: 0x" 66 << static_cast<uint16_t>(value) << ", mask: 0x" 67 << static_cast<uint16_t>(mask) << " }"; 68 return ss.str(); 69 } 70 71 } // namespace phosphor::power::regulators 72