Jason M. Bills | 1ed0cb3 | 2020-12-10 16:53:41 -0800 | [diff] [blame] | 1 | /* |
| 2 | // Copyright (c) 2021 Intel 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 | #include <boost/asio/posix/stream_descriptor.hpp> |
| 18 | #include <error_monitors/base_monitor.hpp> |
| 19 | #include <gpiod.hpp> |
| 20 | #include <host_error_monitor.hpp> |
| 21 | #include <sdbusplus/asio/object_server.hpp> |
| 22 | |
| 23 | #include <iostream> |
| 24 | |
| 25 | namespace host_error_monitor::base_gpio_monitor |
| 26 | { |
| 27 | static constexpr bool debug = false; |
| 28 | |
| 29 | enum class AssertValue |
| 30 | { |
| 31 | lowAssert = 0, |
| 32 | highAssert = 1, |
| 33 | }; |
| 34 | |
| 35 | class BaseGPIOMonitor : public host_error_monitor::base_monitor::BaseMonitor |
| 36 | { |
| 37 | AssertValue assertValue; |
| 38 | int assertEvent; |
| 39 | |
| 40 | gpiod::line line; |
| 41 | boost::asio::posix::stream_descriptor event; |
| 42 | |
| 43 | virtual void logEvent() |
| 44 | {} |
| 45 | |
| 46 | bool requestEvents() |
| 47 | { |
| 48 | line = gpiod::find_line(signalName); |
| 49 | if (!line) |
| 50 | { |
| 51 | std::cerr << "Failed to find the " << signalName << " line\n"; |
| 52 | return false; |
| 53 | } |
| 54 | |
| 55 | try |
| 56 | { |
| 57 | line.request( |
| 58 | {"host-error-monitor", gpiod::line_request::EVENT_BOTH_EDGES}); |
| 59 | } |
| 60 | catch (std::exception&) |
| 61 | { |
| 62 | std::cerr << "Failed to request events for " << signalName << "\n"; |
| 63 | return false; |
| 64 | } |
| 65 | |
| 66 | int lineFd = line.event_get_fd(); |
| 67 | if (lineFd < 0) |
| 68 | { |
| 69 | std::cerr << "Failed to get " << signalName << " fd\n"; |
| 70 | return false; |
| 71 | } |
| 72 | |
| 73 | event.assign(lineFd); |
| 74 | |
| 75 | return true; |
| 76 | } |
| 77 | |
| 78 | bool asserted() |
| 79 | { |
| 80 | if constexpr (debug) |
| 81 | { |
| 82 | std::cerr << "Checking " << signalName << " state\n"; |
| 83 | } |
| 84 | |
| 85 | return (line.get_value() == static_cast<int>(assertValue)); |
| 86 | } |
| 87 | |
| 88 | void checkEvent(bool assertEvent) |
| 89 | { |
| 90 | if (assertEvent) |
| 91 | { |
| 92 | if constexpr (debug) |
| 93 | { |
| 94 | std::cerr << signalName << " asserted\n"; |
| 95 | } |
| 96 | |
| 97 | assertHandler(); |
| 98 | } |
| 99 | else |
| 100 | { |
| 101 | if constexpr (debug) |
| 102 | { |
| 103 | std::cerr << signalName << " deasserted\n"; |
| 104 | } |
| 105 | |
| 106 | deassertHandler(); |
| 107 | } |
| 108 | } |
| 109 | |
| 110 | public: |
| 111 | virtual void assertHandler() |
| 112 | { |
| 113 | std::cerr << signalName << " asserted\n"; |
| 114 | logEvent(); |
| 115 | } |
| 116 | |
| 117 | virtual void deassertHandler() |
| 118 | {} |
| 119 | |
| 120 | private: |
| 121 | void waitForEvent() |
| 122 | { |
| 123 | if constexpr (debug) |
| 124 | { |
| 125 | std::cerr << "Wait for " << signalName << "\n"; |
| 126 | } |
| 127 | |
| 128 | event.async_wait( |
| 129 | boost::asio::posix::stream_descriptor::wait_read, |
| 130 | [this](const boost::system::error_code ec) { |
| 131 | if (ec) |
| 132 | { |
| 133 | // operation_aborted is expected if wait is canceled. |
| 134 | if (ec != boost::asio::error::operation_aborted) |
| 135 | { |
| 136 | std::cerr << signalName |
| 137 | << " wait error: " << ec.message() << "\n"; |
| 138 | } |
| 139 | return; |
| 140 | } |
| 141 | |
| 142 | if constexpr (debug) |
| 143 | { |
| 144 | std::cerr << signalName << " event ready\n"; |
| 145 | } |
| 146 | |
| 147 | gpiod::line_event gpioLineEvent = line.event_read(); |
| 148 | |
| 149 | checkEvent(gpioLineEvent.event_type == assertEvent); |
| 150 | waitForEvent(); |
| 151 | }); |
| 152 | } |
| 153 | |
| 154 | public: |
| 155 | void startMonitoring() |
| 156 | { |
| 157 | if constexpr (debug) |
| 158 | { |
| 159 | std::cerr << "Monitoring " << signalName << "\n"; |
| 160 | } |
| 161 | |
| 162 | checkEvent(asserted()); |
| 163 | waitForEvent(); |
| 164 | } |
| 165 | |
| 166 | BaseGPIOMonitor(boost::asio::io_service& io, |
| 167 | std::shared_ptr<sdbusplus::asio::connection> conn, |
| 168 | const std::string& signalName, AssertValue assertValue) : |
| 169 | BaseMonitor(io, conn, signalName), |
| 170 | event(io), assertValue(assertValue) |
| 171 | { |
| 172 | assertEvent = (assertValue == AssertValue::lowAssert) |
| 173 | ? gpiod::line_event::FALLING_EDGE |
| 174 | : gpiod::line_event::RISING_EDGE; |
| 175 | |
| 176 | if (!requestEvents()) |
| 177 | { |
| 178 | return; |
| 179 | } |
| 180 | valid = true; |
| 181 | } |
| 182 | }; |
| 183 | } // namespace host_error_monitor::base_gpio_monitor |