Shawn McCarney | f1c9061 | 2020-02-24 09:56:53 -0600 | [diff] [blame] | 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 | #pragma once |
| 17 | |
| 18 | #include "action_environment.hpp" |
| 19 | #include "i2c_action.hpp" |
| 20 | |
| 21 | #include <cstdint> |
| 22 | #include <string> |
| 23 | |
| 24 | namespace phosphor::power::regulators |
| 25 | { |
| 26 | |
| 27 | /** |
| 28 | * @class I2CWriteByteAction |
| 29 | * |
| 30 | * Writes a byte to a device register. Communicates with the device directly |
| 31 | * using the I2C interface. |
| 32 | * |
| 33 | * Implements the i2c_write_byte action in the JSON config file. |
| 34 | */ |
| 35 | class I2CWriteByteAction : public I2CAction |
| 36 | { |
| 37 | public: |
| 38 | // Specify which compiler-generated methods we want |
| 39 | I2CWriteByteAction() = delete; |
| 40 | I2CWriteByteAction(const I2CWriteByteAction&) = delete; |
| 41 | I2CWriteByteAction(I2CWriteByteAction&&) = delete; |
| 42 | I2CWriteByteAction& operator=(const I2CWriteByteAction&) = delete; |
| 43 | I2CWriteByteAction& operator=(I2CWriteByteAction&&) = delete; |
| 44 | virtual ~I2CWriteByteAction() = default; |
| 45 | |
| 46 | /** |
| 47 | * Constructor. |
| 48 | * |
| 49 | * @param reg Device register address. Note: named 'reg' because 'register' |
| 50 | * is a reserved keyword. |
| 51 | * @param value Byte value to write. |
| 52 | * @param mask Bit mask. Specifies which bits to write within the byte |
| 53 | * value. Only the bits with a value of 1 in the mask will be |
| 54 | * written. |
| 55 | */ |
| 56 | explicit I2CWriteByteAction(uint8_t reg, uint8_t value, |
| 57 | uint8_t mask = 0xFF) : |
| 58 | reg{reg}, |
| 59 | value{value}, mask{mask} |
| 60 | { |
| 61 | } |
| 62 | |
| 63 | /** |
| 64 | * Executes this action. |
| 65 | * |
| 66 | * Writes a byte to a device register using the I2C interface. |
| 67 | * |
| 68 | * The device register, byte value, and mask (if any) were specified in the |
| 69 | * constructor. |
| 70 | * |
| 71 | * The device is obtained from the specified action environment. |
| 72 | * |
| 73 | * Throws an exception if an error occurs. |
| 74 | * |
| 75 | * @param environment action execution environment |
| 76 | * @return true |
| 77 | */ |
| 78 | virtual bool execute(ActionEnvironment& environment) override; |
| 79 | |
| 80 | /** |
| 81 | * Returns the device register address. |
| 82 | * |
| 83 | * @return register address |
| 84 | */ |
| 85 | uint8_t getRegister() const |
| 86 | { |
| 87 | return reg; |
| 88 | } |
| 89 | |
| 90 | /** |
| 91 | * Returns the byte value to write. |
| 92 | * |
| 93 | * @return value to write |
| 94 | */ |
| 95 | uint8_t getValue() const |
| 96 | { |
| 97 | return value; |
| 98 | } |
| 99 | |
| 100 | /** |
| 101 | * Returns the bit mask. |
| 102 | * |
| 103 | * Specifies which bits to write within the byte value. Only the bits with |
| 104 | * a value of 1 in the mask will be written. |
| 105 | * |
| 106 | * @return bit mask |
| 107 | */ |
| 108 | uint8_t getMask() const |
| 109 | { |
| 110 | return mask; |
| 111 | } |
| 112 | |
| 113 | /** |
| 114 | * Returns a string description of this action. |
| 115 | * |
| 116 | * @return description of action |
| 117 | */ |
| 118 | virtual std::string toString() const override; |
| 119 | |
| 120 | private: |
| 121 | /** |
| 122 | * Device register address. Note: named 'reg' because 'register' is a |
| 123 | * reserved keyword. |
| 124 | */ |
| 125 | const uint8_t reg{0x00}; |
| 126 | |
| 127 | /** |
| 128 | * Byte value to write. |
| 129 | */ |
| 130 | const uint8_t value{0x00}; |
| 131 | |
| 132 | /** |
| 133 | * Bit mask. Specifies which bits to write within the byte value. Only the |
| 134 | * bits with a value of 1 in the mask will be written. |
| 135 | */ |
| 136 | const uint8_t mask{0xFF}; |
| 137 | }; |
| 138 | |
| 139 | } // namespace phosphor::power::regulators |