| /** |
| * Copyright © 2020 IBM Corporation |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| #include "i2c_write_bit_action.hpp" |
| |
| #include "action_error.hpp" |
| #include "i2c_interface.hpp" |
| |
| #include <exception> |
| #include <ios> |
| #include <sstream> |
| |
| namespace phosphor::power::regulators |
| { |
| |
| bool I2CWriteBitAction::execute(ActionEnvironment& environment) |
| { |
| try |
| { |
| // Read value of device register |
| uint8_t registerValue{0x00}; |
| i2c::I2CInterface& interface = getI2CInterface(environment); |
| interface.read(reg, registerValue); |
| |
| // Write bit to register value |
| if (value == 0) |
| { |
| // Clear bit within register value |
| registerValue &= ~(0x01 << position); |
| } |
| else |
| { |
| // Set bit within register value |
| registerValue |= (0x01 << position); |
| } |
| |
| // Write modified value to device register |
| interface.write(reg, registerValue); |
| } |
| catch (const i2c::I2CException& e) |
| { |
| // Nest I2CException within an ActionError so caller will have both the |
| // low level I2C error information and the action information |
| std::throw_with_nested(ActionError(*this)); |
| } |
| return true; |
| } |
| |
| std::string I2CWriteBitAction::toString() const |
| { |
| std::ostringstream ss; |
| ss << "i2c_write_bit: { register: 0x" << std::hex << std::uppercase |
| << static_cast<uint16_t>(reg) << ", position: " << std::dec |
| << static_cast<uint16_t>(position) |
| << ", value: " << static_cast<uint16_t>(value) << " }"; |
| return ss.str(); |
| } |
| |
| } // namespace phosphor::power::regulators |