diff --git a/pmbus.cpp b/pmbus.cpp
new file mode 100644
index 0000000..85e7c43
--- /dev/null
+++ b/pmbus.cpp
@@ -0,0 +1,138 @@
+/**
+ * Copyright © 2017 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 <experimental/filesystem>
+#include <fstream>
+#include <phosphor-logging/elog.hpp>
+#include <phosphor-logging/elog-errors.hpp>
+#include <xyz/openbmc_project/Common/error.hpp>
+#include <xyz/openbmc_project/Control/Device/error.hpp>
+#include <xyz/openbmc_project/Sensor/Device/error.hpp>
+#include "pmbus.hpp"
+
+namespace witherspoon
+{
+namespace pmbus
+{
+
+using namespace phosphor::logging;
+using namespace sdbusplus::xyz::openbmc_project::Common::Error;
+using namespace sdbusplus::xyz::openbmc_project::Control::Device::Error;
+using namespace sdbusplus::xyz::openbmc_project::Sensor::Device::Error;
+namespace fs = std::experimental::filesystem;
+
+std::string PMBus::insertPageNum(const std::string& templateName,
+                                 size_t page)
+{
+    auto name = templateName;
+
+    //insert the page where the P was
+    auto pos = name.find('P');
+    if (pos != std::string::npos)
+    {
+        name.replace(pos, 1, std::to_string(page));
+    }
+
+    return name;
+}
+
+bool PMBus::readBitInPage(const std::string& name, size_t page)
+{
+    auto pagedBit = insertPageNum(name, page);
+    return readBit(pagedBit);
+}
+
+bool PMBus::readBit(const std::string& name)
+{
+    unsigned long int value = 0;
+    std::ifstream file;
+    fs::path path{basePath};
+
+    path /= name;
+
+    file.exceptions(std::ifstream::failbit |
+                    std::ifstream::badbit |
+                    std::ifstream::eofbit);
+
+    try
+    {
+        char* err = NULL;
+        std::string val{1, '\0'};
+
+        file.open(path);
+        file.read(&val[0], 1);
+
+        value = strtoul(val.c_str(), &err, 10);
+
+        if (*err)
+        {
+            log<level::ERR>("Invalid character in sysfs file",
+                            entry("FILE=%s", path.c_str()),
+                            entry("CONTENTS=%s", val.c_str()));
+
+            //Catch below and handle as a read failure
+            elog<InternalFailure>();
+        }
+    }
+    catch (std::exception& e)
+    {
+        auto rc = errno;
+
+        log<level::ERR>("Failed to read sysfs file",
+                entry("FILENAME=%s", path.c_str()));
+
+        elog<ReadFailure>(xyz::openbmc_project::Sensor::Device::
+                          ReadFailure::CALLOUT_ERRNO(rc),
+                          xyz::openbmc_project::Sensor::Device::
+                          ReadFailure::CALLOUT_DEVICE_PATH(
+                              fs::canonical(basePath).c_str()));
+    }
+
+    return value != 0;
+}
+
+void PMBus::write(const std::string& name, int value)
+{
+    std::ofstream file;
+    fs::path path{basePath};
+
+    path /= name;
+
+    file.exceptions(std::ofstream::failbit |
+                    std::ofstream::badbit |
+                    std::ofstream::eofbit);
+
+    try
+    {
+        file.open(path);
+        file << value;
+    }
+    catch (const std::exception& e)
+    {
+        auto rc = errno;
+
+        log<level::ERR>("Failed to write sysfs file",
+                entry("FILENAME=%s", path.c_str()));
+
+        elog<WriteFailure>(xyz::openbmc_project::Control::Device::
+                           WriteFailure::CALLOUT_ERRNO(rc),
+                           xyz::openbmc_project::Control::Device::
+                           WriteFailure::CALLOUT_DEVICE_PATH(
+                               fs::canonical(basePath).c_str()));
+    }
+}
+
+}
+}