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
execute(ActionEnvironment & environment)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
toString() const60 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