Create gpio dbus service basing on EntityManager.

Service name is "xyz.openbmc_project.Gpio" with below properties:
.Direction
.Enabled
.Value

Whenever "Enabled" is set to "false" the "Value" and "Direction"
properties cannot be overridden.

Tested By: Cezary Golder

Change-Id: I9192676d00c56e3637ded9ca4029b1df50a96f26
Signed-off-by: Golder, Cezary <cezary.golder@intel.com>

8 files changed, 878 insertions, 0 deletions

diff --git a/gpiodaemon/.clang-format b/gpiodaemon/.clang-format
new file mode 100644
index 0000000..8c5278e
--- /dev/null
+++ b/gpiodaemon/.clang-format
@@ -0,0 +1,98 @@
+---
+Language:        Cpp
+# BasedOnStyle:  LLVM
+AccessModifierOffset: -2
+AlignAfterOpenBracket: Align
+AlignConsecutiveAssignments: false
+AlignConsecutiveDeclarations: false
+AlignEscapedNewlinesLeft: false
+AlignOperands:   true
+AlignTrailingComments: true
+AllowAllParametersOfDeclarationOnNextLine: true
+AllowShortBlocksOnASingleLine: false
+AllowShortCaseLabelsOnASingleLine: false
+AllowShortFunctionsOnASingleLine: None
+AllowShortIfStatementsOnASingleLine: false
+AllowShortLoopsOnASingleLine: false
+AlwaysBreakAfterDefinitionReturnType: None
+AlwaysBreakAfterReturnType: None
+AlwaysBreakBeforeMultilineStrings: false
+AlwaysBreakTemplateDeclarations: true
+BinPackArguments: true
+BinPackParameters: true
+BraceWrapping:
+  AfterClass:      true
+  AfterControlStatement: true
+  AfterEnum:       true
+  AfterFunction:   true
+  AfterNamespace:  true
+  AfterObjCDeclaration: true
+  AfterStruct:     true
+  AfterUnion:      true
+  BeforeCatch:     true
+  BeforeElse:      true
+  IndentBraces:    false
+BreakBeforeBinaryOperators: None
+BreakBeforeBraces: Custom
+BreakBeforeTernaryOperators: true
+BreakConstructorInitializers: AfterColon
+ColumnLimit:     80
+CommentPragmas:  '^ IWYU pragma:'
+ConstructorInitializerAllOnOneLineOrOnePerLine: false
+ConstructorInitializerIndentWidth: 4
+ContinuationIndentWidth: 4
+Cpp11BracedListStyle: true
+DerivePointerAlignment: false
+DisableFormat:   false
+ExperimentalAutoDetectBinPacking: false
+FixNamespaceComments: true
+ForEachMacros:   [ foreach, Q_FOREACH, BOOST_FOREACH ]
+IncludeBlocks: Regroup
+IncludeCategories:
+  - Regex:           '^[<"](gtest|gmock)'
+    Priority:        5
+  - Regex:           '^"config.h"'
+    Priority:        -1
+  - Regex:           '^".*\.hpp"'
+    Priority:        1
+  - Regex:           '^<.*\.h>'
+    Priority:        2
+  - Regex:           '^<.*'
+    Priority:        3
+  - Regex:           '.*'
+    Priority:        4
+IndentCaseLabels: true
+IndentWidth:     4
+IndentWrappedFunctionNames: true
+KeepEmptyLinesAtTheStartOfBlocks: true
+MacroBlockBegin: ''
+MacroBlockEnd:   ''
+MaxEmptyLinesToKeep: 1
+NamespaceIndentation: None
+ObjCBlockIndentWidth: 2
+ObjCSpaceAfterProperty: false
+ObjCSpaceBeforeProtocolList: true
+PenaltyBreakBeforeFirstCallParameter: 19
+PenaltyBreakComment: 300
+PenaltyBreakFirstLessLess: 120
+PenaltyBreakString: 1000
+PenaltyExcessCharacter: 1000000
+PenaltyReturnTypeOnItsOwnLine: 60
+PointerAlignment: Left
+ReflowComments:  true
+SortIncludes:    true
+SortUsingDeclarations: true
+SpaceAfterCStyleCast: false
+SpaceBeforeAssignmentOperators: true
+SpaceBeforeParens: ControlStatements
+SpaceInEmptyParentheses: false
+SpacesBeforeTrailingComments: 1
+SpacesInAngles:  false
+SpacesInContainerLiterals: true
+SpacesInCStyleCastParentheses: false
+SpacesInParentheses: false
+SpacesInSquareBrackets: false
+Standard:        Cpp11
+TabWidth:        4
+UseTab:          Never
+...
diff --git a/gpiodaemon/CMakeLists.txt b/gpiodaemon/CMakeLists.txt
new file mode 100644
index 0000000..9fca745
--- /dev/null
+++ b/gpiodaemon/CMakeLists.txt
@@ -0,0 +1,42 @@
+cmake_minimum_required(VERSION 3.5 FATAL_ERROR)
+project(gpiodaemon CXX)
+set(CMAKE_CXX_STANDARD 17)
+set(CMAKE_CXX_STANDARD_REQUIRED ON)
+set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -fno-rtti")
+set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -fno-rtti")
+
+include_directories(${CMAKE_CURRENT_SOURCE_DIR}/include)
+find_package(Boost REQUIRED)
+include_directories(${Boost_INCLUDE_DIRS})
+add_definitions(-DBOOST_ERROR_CODE_HEADER_ONLY)
+add_definitions(-DBOOST_SYSTEM_NO_DEPRECATED)
+add_definitions(-DBOOST_ALL_NO_LIB)
+add_definitions(-DBOOST_NO_RTTI)
+add_definitions(-DBOOST_NO_TYPEID)
+add_definitions(-DBOOST_ASIO_DISABLE_THREADS)
+
+set(SRC_FILES src/gpiodaemon.cpp src/gpioutils.cpp)
+
+# import libsystemd
+find_package(PkgConfig REQUIRED)
+pkg_check_modules(SYSTEMD libsystemd REQUIRED)
+
+# import sdbusplus
+find_package(PkgConfig REQUIRED)
+pkg_check_modules(SDBUSPLUSPLUS sdbusplus REQUIRED)
+
+# import phosphor-logging
+find_package(PkgConfig REQUIRED)
+pkg_check_modules(LOGGING phosphor-logging REQUIRED)
+
+add_executable(${PROJECT_NAME} ${SRC_FILES})
+target_link_libraries(${PROJECT_NAME} systemd)
+target_link_libraries(${PROJECT_NAME} sdbusplus -lstdc++fs)
+target_link_libraries(${PROJECT_NAME} ${Boost_LIBRARIES})
+
+link_directories(${EXTERNAL_INSTALL_LOCATION}/lib)
+
+set(SERVICE_FILES ${PROJECT_SOURCE_DIR}/gpiodaemon.service)
+
+install(TARGETS ${PROJECT_NAME} DESTINATION sbin)
+install(FILES ${SERVICE_FILES} DESTINATION /lib/systemd/system/)
\ No newline at end of file
diff --git a/gpiodaemon/LICENSE b/gpiodaemon/LICENSE
new file mode 100644
index 0000000..8dada3e
--- /dev/null
+++ b/gpiodaemon/LICENSE
@@ -0,0 +1,201 @@
+                                 Apache License
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+
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diff --git a/gpiodaemon/gpiodaemon.service b/gpiodaemon/gpiodaemon.service
new file mode 100644
index 0000000..216697e
--- /dev/null
+++ b/gpiodaemon/gpiodaemon.service
@@ -0,0 +1,12 @@
+[Unit]
+Description=Gpio daemon
+
+[Service]
+Restart=always
+RestartSec=2
+ExecStart=/usr/sbin/gpiodaemon
+StartLimitInterval=0
+Type=simple
+
+[Install]
+WantedBy=default.target
diff --git a/gpiodaemon/include/gpiodaemon.hpp b/gpiodaemon/include/gpiodaemon.hpp
new file mode 100644
index 0000000..cd08d92
--- /dev/null
+++ b/gpiodaemon/include/gpiodaemon.hpp
@@ -0,0 +1,69 @@
+/*
+// Copyright (c) 2018 Intel 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.
+*/
+
+#pragma once
+#include <boost/asio.hpp>
+#include <experimental/filesystem>
+#include <phosphor-logging/log.hpp>
+#include <sdbusplus/asio/object_server.hpp>
+
+class GpioEn
+{
+    std::string name;
+    uint16_t number;
+    bool enabled;
+
+  public:
+    GpioEn(const std::string& name_, uint16_t number_, bool enabled_) :
+        name(name_), number(number_), enabled(enabled_){};
+
+    std::string getName() const
+    {
+        return name;
+    }
+    uint16_t getNumber() const
+    {
+        return number;
+    }
+    bool getEnabled() const
+    {
+        return enabled;
+    }
+    void setEnabled(bool value)
+    {
+        enabled = value;
+    }
+};
+
+class GpioManager
+{
+    std::vector<GpioEn> gpioEnableList;
+    std::vector<std::experimental::filesystem::path> gpioPaths;
+    sdbusplus::asio::object_server& server;
+    std::shared_ptr<sdbusplus::asio::connection> conn;
+    std::shared_ptr<sdbusplus::asio::dbus_interface> iface;
+    std::vector<std::string> paths;
+
+    GpioEn* findGpioObj(const std::string& gpioName);
+    bool findGpioDirs(
+        const std::experimental::filesystem::path& dirPath,
+        const std::string& matchString,
+        std::vector<std::experimental::filesystem::path>& foundPaths);
+
+  public:
+    GpioManager(sdbusplus::asio::object_server& srv,
+                std::shared_ptr<sdbusplus::asio::connection>& conn);
+};
diff --git a/gpiodaemon/include/gpioutils.hpp b/gpiodaemon/include/gpioutils.hpp
new file mode 100644
index 0000000..3eb7225
--- /dev/null
+++ b/gpiodaemon/include/gpioutils.hpp
@@ -0,0 +1,52 @@
+/*
+// Copyright (c) 2018 Intel 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.
+*/
+
+#pragma once
+
+#include <experimental/filesystem>
+#include <fstream>
+
+enum class GpioValue
+{
+    low = 0,
+    high
+};
+
+enum class GpioDirection
+{
+    in = 0,
+    out,
+    both
+};
+
+class Gpio
+{
+    std::string gpioNumber;
+
+    bool gpioExist();
+    void gpioExport();
+    void gpioUnexport();
+
+  public:
+    Gpio(std::string number);
+    Gpio(const Gpio&) = default;
+    Gpio& operator=(const Gpio&) = default;
+
+    GpioValue getValue();
+    void setValue(const GpioValue& value);
+    std::string getDirection();
+    void setDirection(const std::string& direction);
+};
diff --git a/gpiodaemon/src/gpiodaemon.cpp b/gpiodaemon/src/gpiodaemon.cpp
new file mode 100644
index 0000000..2cdfdc3
--- /dev/null
+++ b/gpiodaemon/src/gpiodaemon.cpp
@@ -0,0 +1,288 @@
+/*
+// Copyright (c) 2018 Intel 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 "gpiodaemon.hpp"
+
+#include "gpioutils.hpp"
+
+#include <boost/algorithm/string/replace.hpp>
+#include <regex>
+
+static constexpr const char* entityMgrService =
+    "xyz.openbmc_project.EntityManager";
+static constexpr const char* gpioService = "xyz.openbmc_project.Gpio";
+static constexpr const char* gpioConfigInterface =
+    "xyz.openbmc_project.Configuration.Gpio";
+static constexpr const char* gpioInterface = "xyz.openbmc_project.Control.Gpio";
+static constexpr const char* gpioPath = "/xyz/openbmc_project/control/gpio/";
+static constexpr const char* propInterface = "org.freedesktop.DBus.Properties";
+
+static constexpr const char* objPath = "/xyz/openbmc_project/object_mapper";
+static constexpr const char* objService = "xyz.openbmc_project.ObjectMapper";
+static constexpr const char* objInterface = "xyz.openbmc_project.ObjectMapper";
+
+const static constexpr size_t waitTime = 2; // seconds
+
+using BasicVariantType =
+    sdbusplus::message::variant<std::string, int64_t, uint64_t, double, int32_t,
+                                uint32_t, int16_t, uint16_t, uint8_t, bool>;
+
+GpioManager::GpioManager(sdbusplus::asio::object_server& srv_,
+                         std::shared_ptr<sdbusplus::asio::connection>& conn_) :
+    server(srv_),
+    conn(conn_)
+{
+    using GetSubTreeType = std::vector<std::pair<
+        std::string,
+        std::vector<std::pair<std::string, std::vector<std::string>>>>>;
+
+    auto mesg =
+        conn->new_method_call(objService, objPath, objInterface, "GetSubTree");
+
+    static const auto depth = 3;
+    mesg.append("/xyz/openbmc_project/inventory/system", depth,
+                std::vector<std::string>());
+
+    try
+    {
+        auto ret = conn->call(mesg);
+
+        GetSubTreeType subtree;
+        ret.read(subtree);
+
+        for (const auto& i : subtree)
+        {
+            for (const auto& j : i.second)
+            {
+                for (const auto& k : j.second)
+                {
+                    if (gpioConfigInterface == k)
+                    {
+                        paths.push_back(i.first);
+                    }
+                }
+            }
+        }
+    }
+    catch (sdbusplus::exception::SdBusError& e)
+    {
+        phosphor::logging::log<phosphor::logging::level::INFO>(
+            "ERROR while readding ObjectMapper.");
+        return;
+    }
+
+    for (const auto& path : paths)
+    {
+        conn->async_method_call(
+            [this, &path](
+                boost::system::error_code ec,
+                const boost::container::flat_map<std::string, BasicVariantType>&
+                    result) {
+                if (ec)
+                {
+                    phosphor::logging::log<phosphor::logging::level::INFO>(
+                        ("ERROR with async_method_call path: " + path).c_str());
+                }
+                else
+                {
+                    auto nameFind = result.find("Name");
+                    auto indexFind = result.find("Index");
+                    auto polarityFind = result.find("Polarity");
+
+                    if (nameFind == result.end() || indexFind == result.end() ||
+                        polarityFind == result.end())
+                    {
+                        phosphor::logging::log<phosphor::logging::level::INFO>(
+                            "ERROR accessing entity manager.");
+                        return;
+                    }
+
+                    uint64_t index = indexFind->second.get<uint64_t>();
+                    std::string gpioName = nameFind->second.get<std::string>();
+                    bool inverted =
+                        polarityFind->second.get<std::string>() == "Low";
+
+                    boost::replace_all(gpioName, " ", "_");
+
+                    // Add gpio entries to be managed by gpiodaemon
+                    gpioEnableList.push_back(
+                        GpioEn(gpioName, (uint16_t)index, false));
+
+                    // Read present gpio data from /sys/class/gpio/...
+                    Gpio gpio = Gpio(std::to_string(index));
+
+                    // Add path to server object
+                    iface = server.add_interface(gpioPath + gpioName,
+                                                 gpioInterface);
+
+                    /////////////////////////////
+                    // Set generic properties:
+                    //    - enabled - when set to false other properties like
+                    //    value and direction
+                    //                cannot be overriden
+                    //    - value
+                    //    - direction
+                    //    - polarity
+                    /////////////////////////////
+                    iface->register_property(
+                        "Enabled", true,
+                        [this, gpioName](const bool& req, bool& propertyValue) {
+                            auto it = findGpioObj(gpioName);
+                            if (it != nullptr)
+                            {
+                                it->setEnabled(req);
+                                propertyValue = req;
+                                return 1;
+                            }
+                            return 0;
+                        });
+
+                    bool value = static_cast<bool>(gpio.getValue());
+                    if (inverted)
+                    {
+                        value = !value;
+                    }
+                    iface->register_property(
+                        "Value", value,
+                        // Override set
+                        [this, gpioName, inverted](const bool& req,
+                                                   bool& propertyValue) {
+                            auto it = findGpioObj(gpioName);
+
+                            if (it != nullptr)
+                            {
+                                // If Gpio enabled property is set as true then
+                                // reject set request
+                                if (it->getEnabled())
+                                {
+                                    Gpio gpio =
+                                        Gpio(std::to_string(it->getNumber()));
+                                    bool setVal = req;
+                                    if (inverted)
+                                    {
+                                        setVal = !setVal;
+                                    }
+                                    gpio.setValue(
+                                        static_cast<GpioValue>(setVal));
+
+                                    propertyValue = req;
+                                    return 1;
+                                }
+                                return 0;
+                            }
+                            return 0;
+                        });
+
+                    iface->register_property(
+                        "Direction", gpio.getDirection(),
+                        // Override set
+                        [this, gpioName](const std::string& req,
+                                         std::string& propertyValue) {
+                            auto it = findGpioObj(gpioName);
+
+                            if (it != nullptr)
+                            {
+                                // If Gpio enabled property is set as true than
+                                // reject request
+                                if (it->getEnabled())
+                                {
+                                    Gpio gpio =
+                                        Gpio(std::to_string(it->getNumber()));
+                                    gpio.setDirection(req);
+
+                                    propertyValue = req;
+                                    return 1;
+                                }
+                                return 0;
+                            }
+                            return 0;
+                        });
+                    iface->initialize();
+                }
+            },
+            entityMgrService, path, propInterface, "GetAll",
+            gpioConfigInterface);
+    }
+}
+
+GpioEn* GpioManager::findGpioObj(const std::string& gpioName)
+{
+    auto it = std::find_if(
+        gpioEnableList.begin(), gpioEnableList.end(),
+        [&gpioName](const GpioEn& obj) { return obj.getName() == gpioName; });
+    if (it != gpioEnableList.end())
+    {
+        return &(*it);
+    }
+    return nullptr;
+}
+
+bool GpioManager::findGpioDirs(
+    const std::experimental::filesystem::path& dirPath,
+    const std::string& matchString,
+    std::vector<std::experimental::filesystem::path>& foundPaths)
+{
+    if (!std::experimental::filesystem::exists(dirPath))
+    {
+        return false;
+    }
+
+    std::regex search(matchString);
+    std::smatch match;
+    for (const auto& p :
+         std::experimental::filesystem::recursive_directory_iterator(dirPath))
+    {
+        std::string path = p.path().string();
+        if (is_directory(p))
+        {
+            if (std::regex_search(path, match, search))
+            {
+                foundPaths.emplace_back(p.path());
+            }
+        }
+    }
+    return true;
+}
+
+int main()
+{
+    boost::asio::io_service io;
+    auto systemBus = std::make_shared<sdbusplus::asio::connection>(io);
+
+    systemBus->request_name(gpioService);
+    sdbusplus::asio::object_server server(systemBus);
+
+    static auto match = std::make_unique<sdbusplus::bus::match::match>(
+        static_cast<sdbusplus::bus::bus&>(*systemBus),
+        "type='signal',member='PropertiesChanged',"
+        "arg0namespace='" +
+            std::string(gpioConfigInterface) + "'",
+        [](sdbusplus::message::message& message) {
+            phosphor::logging::log<phosphor::logging::level::INFO>(
+                "New configuration detected. Restarting gpiodaemon.");
+
+            std::this_thread::sleep_for(std::chrono::seconds(waitTime));
+
+            // todo: restarting isn't the best approach, really we should detect
+            // what changed and add the appropriate gpios, this will be changed
+            // shortly
+            std::exit(0);
+        });
+
+    GpioManager gpioMgr(server, systemBus);
+
+    io.run();
+}
diff --git a/gpiodaemon/src/gpioutils.cpp b/gpiodaemon/src/gpioutils.cpp
new file mode 100644
index 0000000..9561795
--- /dev/null
+++ b/gpiodaemon/src/gpioutils.cpp
@@ -0,0 +1,116 @@
+/*
+// Copyright (c) 2018 Intel 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 <gpioutils.hpp>
+
+static constexpr const char* pathExport = "/sys/class/gpio/export";
+static constexpr const char* pathUnexport = "/sys/class/gpio/unexport";
+static constexpr const char* prefix = "/sys/class/gpio/gpio";
+static constexpr const char* postfixValue = "/value";
+static constexpr const char* postfixDirection = "/direction";
+
+Gpio::Gpio(std::string number) : gpioNumber(number)
+{
+    gpioExport();
+}
+
+bool Gpio::gpioExist()
+{
+    return std::experimental::filesystem::exists(prefix + gpioNumber);
+}
+
+void Gpio::gpioExport()
+{
+    if (!gpioExist())
+    {
+        std::fstream gpioExport;
+        gpioExport.open(pathExport, std::ios::out);
+        if (gpioExport.good())
+        {
+            gpioExport << gpioNumber;
+        }
+    }
+}
+
+void Gpio::gpioUnexport()
+{
+    if (gpioExist())
+    {
+        std::fstream gpioExport;
+        gpioExport.open(pathUnexport, std::ios::out);
+        if (gpioExport.good())
+        {
+            gpioExport << gpioNumber;
+        }
+    }
+}
+
+GpioValue Gpio::getValue()
+{
+    std::fstream gpioFile;
+    std::string gpioValue;
+    std::string gpioFilePath = prefix + gpioNumber + postfixValue;
+
+    gpioFile.open(gpioFilePath, std::ios::in);
+    if (gpioFile.good())
+    {
+        gpioFile >> gpioValue;
+    }
+
+    return gpioValue == "0" ? GpioValue::low : GpioValue::high;
+}
+
+void Gpio::setValue(const GpioValue& value)
+{
+    std::fstream gpioFile;
+    std::string gpioFilePath = prefix + gpioNumber + postfixValue;
+
+    setDirection("out");
+
+    gpioFile.open(gpioFilePath, std::ios::out);
+    if (gpioFile.good())
+    {
+        gpioFile << std::to_string((uint8_t)value);
+    }
+}
+
+std::string Gpio::getDirection()
+{
+    std::fstream gpioFile;
+    std::string gpioFilePath = prefix + gpioNumber + postfixDirection;
+    std::string direction;
+
+    gpioFile.open(gpioFilePath, std::ios::in);
+    if (gpioFile.good())
+    {
+        gpioFile >> direction;
+    }
+
+    return direction;
+}
+
+void Gpio::setDirection(const std::string& direction)
+{
+    std::fstream gpioFile;
+    std::string gpioFilePath = prefix + gpioNumber + postfixDirection;
+
+    gpioFile.open(gpioFilePath, std::ios::out);
+    if (gpioFile.good())
+    {
+        gpioFile << direction;
+    }
+    gpioFile.close();
+}