/**********************************************************************
 * COPYRIGHT 2020 MULTI-TECH SYSTEMS, INC.
 *
 * ALL RIGHTS RESERVED BY AND FOR THE EXCLUSIVE BENEFIT OF
 * MULTI-TECH SYSTEMS, INC.
 *
 * MULTI-TECH SYSTEMS, INC. - CONFIDENTIAL AND PROPRIETARY
 * INFORMATION AND/OR TRADE SECRET.
 *
 * NOTICE: ALL CODE, PROGRAM, INFORMATION, SCRIPT, INSTRUCTION,
 * DATA, AND COMMENT HEREIN IS AND SHALL REMAIN THE CONFIDENTIAL
 * INFORMATION AND PROPERTY OF MULTI-TECH SYSTEMS, INC.
 * USE AND DISCLOSURE THEREOF, EXCEPT AS STRICTLY AUTHORIZED IN A
 * WRITTEN AGREEMENT SIGNED BY MULTI-TECH SYSTEMS, INC. IS PROHIBITED.
 *
 ***********************************************************************/

#include <gpiod.h>
#include "Device.h"

const std::string cmdname ("mts-io-sysfs");
const std::vector<std::string> Device::apIdentifiers = {
    "ap1", "ap2", "lora", "lora-2", "slot1", "slot2"};
const std::regex
    Device::apFilters("(modalias)|(power)(.*)|(subsystem)|(uevent)");
const std::regex Device::serialModeFilter("(.*)(serial-mode)");
const std::regex Device::mtcdt3HwVersionFilters("(MTCDT3AC)(.*)");
const std::regex Device::iotRtrVersionFilters("(IOTR)(.*)");
const std::regex Device::mtrFilters("(MTR-)(.*)");
const std::regex Device::storeFilters(
    "(.*)(mac-)(.*)|(.*)(-id)|(uuid)|(.*)(/eui)|(.*)(/"
    "cdone)|(.*)(hw-version)|(oem-string)(.*)|(imei)|(capability)(.*)|(radio-"
    "reset-backoff-seconds)|(modalias)|(power)|((subsystem)(.*))|(uevent)|("
    "board-temperature)|(reset)|(led3)|(led-ls)|(usbhd-ps-oc)|(.*)(adc[0-9])|(."
    "*)(din[0-9])|(gpi[0-9])|(gpi[0-9][0-9])");
const std::regex Device::showFilters("(modalias)|(subsystem)|(uevent)");

std::map<std::string, bool> Device::capabilityList = {
    {"adc", false},
    {"battery", false},
    {"bluetooth", false},
    {"cell", false},
    {"cellPpp", false},
    {"cellWwan", false},
    {"din", false},
    {"dout", false},
    {"externalSerialPort", false},
    {"gpio", false},
    {"gps", false},
    {"lora", false},
    {"loraLbt", false},
    {"loraNetworkServer", false},
    {"nodeRed", false},
    {"rs232", false},
    {"rs422", false},
    {"rs485", false},
    {"serial", false},
    {"supercap", false},
    {"wifi", false},
    {"docker", false},
    {"tpm", false},
    {"userDataEncryption", false}};

std::map<std::string, std::string> Device::ethSwitchList;
std::vector<std::string> Device::dInputs;
std::vector<std::string> Device::dOutputs;

std::map<std::string, std::string> Device::deviceInfoList = {
    {"deviceId", ""},
    {"hardwareVersion", ""},
    {"imei", ""},
    {"macAddress", "00:00:00:00:00:00"},
    {"macBluetooth", "00:00:00:00:00:00"},
    {"macWifi", "00:00:00:00:00:00"},
    {"productId", ""},
    {"uuid", ""},
    {"vendorId", ""},
    {"oemString1", ""},
    {"oemString2", ""}};

Device::Device() {
    isRoot = !getuid();
    accessoryCardsList.reserve(accessoryCardsListSize);
    accessoryCardsList.push_back(std::make_unique<Lora21Card>(*this));
    accessoryCardsList.push_back(std::make_unique<Lora21ExtCard>(*this));
    accessoryCardsList.push_back(std::make_unique<Lora03Card>(*this));
    accessoryCardsList.push_back(std::make_unique<Lora10Card>(*this));
    accessoryCardsList.push_back(std::make_unique<Lora15Card>(*this));
    accessoryCardsList.push_back(std::make_unique<Lora2G4Card>(*this));
    accessoryCardsList.push_back(std::make_unique<Gpiob>(*this));
    accessoryCardsList.push_back(std::make_unique<Mfser>(*this));
}

bool Device::isAccessoryCard(const char *d_name, const char *dir_name) {
    return std::binary_search(apIdentifiers.begin(), apIdentifiers.end(),
                              dir_name) &&
           !regex_match(d_name, apFilters);
}

void Device::sortAccessoryCards() {
    rapidjson::SizeType i, j;
    for (i = 0; i < accessoryCards.Size() - 1; i++) {
        for (j = 0; j < accessoryCards.Size() - i - 1; j++) {
            if (accessoryCards[j]["port"].GetString() <
                accessoryCards[j + 1]["port"].GetString()) {
                accessoryCards[j].Swap(accessoryCards[j + 1]);
            }
        }
    }
}

bool Device::isValidDirectory(const struct dirent *entry, std::string fullPath,
                              const char *d_name) {
    std::string path = fullPath + "/" + std::string(d_name);
    return (entry->d_type & DT_DIR) && strcmp(d_name, "..") != 0 &&
           strcmp(d_name, ".") != 0 && (path.length() < PATH_MAX);
}

void Device::getSystemTreeJson(const char *dir_name) {
    std::string fullPath = SYSFS_PLATFORM + std::string(dir_name);
    DIR *d = opendir(fullPath.c_str());
    if (!d) {
        printError("Cannot open directory %s", fullPath);
        exitHandler(99);
    }
    while (1) {
        struct dirent *entry =
            readdir(d); /* Gets subsequent entries from "d" */
        if (!entry) {   /* If there are no more entries, exit */
            break;
        }
        const char *d_name = entry->d_name; /* Get file name */
        std::string fileData;
        if (!(entry->d_type & DT_DIR) &&
            (MTS::System::readFile(fullPath + "/" + std::string(d_name),
                                   fileData) == 0)) {
            fileData = MTS::Text::trim(fileData);
            if (strlen(dir_name) > 0) {
                if (isAccessoryCard(d_name, dir_name)) {
                    if (accessoryCard.IsNull()) {
                        accessoryCard.SetObject();
                        accessoryCard.AddMember(
                            "port",
                            rapidjson::Value().SetString(dir_name, acAlloc),
                            acAlloc);
                    } else if (accessoryCard["port"] != dir_name) {
                        accessoryCards.PushBack(accessoryCard, acAlloc);
                        accessoryCard.SetObject();
                        accessoryCard.AddMember(
                            "port",
                            rapidjson::Value().SetString(dir_name, acAlloc),
                            acAlloc);
                    }
                    if (strcmp(d_name, "product-id") ==
                        0) { /* Map card specific details based on the product
                                id */
                        for (unsigned int i = 0; i < accessoryCardsList.size();
                             i++) {
                            if (regex_match(fileData,
                                            accessoryCardsList[i]->GetName())) {
                                accessoryCardsList[i]->AddToDeviceInfo(
                                    dir_name, fileData);
                                break;
                            }
                        }
                    }
                    accessoryCard.AddMember(
                        rapidjson::Value().SetString(
                            toCamelCase(d_name).c_str(), acAlloc),
                        rapidjson::Value().SetString(fileData.c_str(), acAlloc),
                        acAlloc);
                } else if (strcmp(dir_name, "capability") == 0 &&
                           fileData == "1") {
                    capabilityList[toCamelCase(d_name)] = true;
                } else if (strcmp(dir_name, "eth-switch") == 0) {
                    ethSwitchList[toCamelCase(d_name)] = fileData;
                }
            } else if ((entry->d_type != DT_LNK)) {
                if (deviceInfoList.count(toCamelCase(d_name)) > 0) {
                    deviceInfoList[toCamelCase(d_name)] = fileData;
                } else if (strcmp(d_name, "hw-version") == 0) {
                    deviceInfoList["hardwareVersion"] = fileData;
                    if (regex_match(fileData, mtcdt3HwVersionFilters)) {
                        capabilityList["rs232"] = true;
                        capabilityList["rs422"] = true;
                        capabilityList["rs485"] = true;
                        capabilityList["serial"] = true;
                    }
                    if (regex_match(fileData, iotRtrVersionFilters)) {
                        /*
                        The order of the elements is important! This array is used to access Digital IOs,
                        in particular in SMS commands!
                        */
                        dInputs.push_back("USER_DIO_IN");
                        dOutputs.push_back("USER_DIO_OUT");
                    }
                } else if (strcmp(d_name, "mac-eth") == 0) {
                    deviceInfoList["macAddress"] = fileData;
                } else if (strcmp(d_name, "has-radio") == 0 &&
                           fileData == "1") {
                    capabilityList["cell"] = true;
                } else if (strcmp(d_name, "oem-string1") == 0) {
                    deviceInfoList["oemString1"] = fileData;
                } else if (strcmp(d_name, "oem-string2") == 0) {
                    deviceInfoList["oemString2"] = fileData;
                };
                if (strcmp(d_name, "product-id") == 0) {
                    if (regex_match(fileData, mtrFilters)) {
                        capabilityList["rs232"] = true;
                        capabilityList["serial"] = true;
                    }
                }
            }
        }
        if (isValidDirectory(entry, fullPath,
                             d_name)) { /* Check that the directory is not "d"
                                           or d's parent */
            getSystemTreeJson(d_name);  /* Recursively call with the new path */
        }
    }
    if (closedir(d)) {
        /* After going through all the entries, close the directory */
        printError("Could not close %s", fullPath);
        exitHandler(errno);
    }
}

void Device::init() {
    if (!isRoot) {
        printError("Must be root to generate device_info.json");
        exitHandler(99);
    }
    load();
    writeJson(deviceInfo, DEVICE_INFO_FILE);
    exitHandler(0);
}

void Device::json() {
    if (!isRoot) {
        printError("Must be root to generate json");
        exitHandler(99);
    }
    load();
    printJson();
    exitHandler(0);
}

void Device::load() {
    deviceInfo.SetObject();
    capabilities.SetObject();
    ethSwitch.SetObject();
    accessoryCards.SetArray();
    getSystemTreeJson("");
    if (!accessoryCard.IsNull()) {
        accessoryCards.PushBack(accessoryCard, acAlloc);
        if (accessoryCards.Size() > 1) {
            sortAccessoryCards();
        }
    }

    mapFileToCapability();
    mapFirmware();
    mapMacAddress2();
    for (const auto &capability : capabilityList) {
        capabilities.AddMember(
            rapidjson::Value().SetString(capability.first.c_str(),
                                         capability.first.length(), acAlloc),
            capability.second, acAlloc);
    }

    if (ethSwitchList.count("chip") && ethSwitchList.count("numPorts")) {
        auto &ethSwitchAlloc = ethSwitch.GetAllocator();
        const std::string &chip = ethSwitchList.at("chip");
        ethSwitch.AddMember("chip",
                            rapidjson::Value().SetString(
                                chip.c_str(), chip.length(), ethSwitchAlloc),
                            ethSwitchAlloc);
        rapidjson::Value ports;
        ports.SetObject();
        for (int i = 0; i < std::stoi(ethSwitchList.at("numPorts")); ++i) {
            const std::string num = std::to_string(i);
            const std::string keyLabel = "port" + num + "Label";
            const std::string keyId = "port" + num + "Id";
            const std::string keyMac = "port" + num + "Mac";
            ;
            if (ethSwitchList.count(keyLabel) && ethSwitchList.count(keyId) &&
                ethSwitchList.count(keyMac)) {
                rapidjson::Value port;
                port.SetObject();
                port.AddMember("id",
                               rapidjson::Value().SetInt(
                                   std::stoi(ethSwitchList.at(keyId))),
                               ethSwitchAlloc);
                port.AddMember("mac",
                               rapidjson::Value().SetString(
                                   ethSwitchList.at(keyMac).c_str(),
                                   ethSwitchList.at(keyMac).length(),
                                   ethSwitchAlloc),
                               ethSwitchAlloc);
                ports.AddMember(rapidjson::Value().SetString(
                                    ethSwitchList.at(keyLabel).c_str(),
                                    ethSwitchList.at(keyLabel).length(),
                                    ethSwitchAlloc),
                                std::move(port), ethSwitchAlloc);
            }
        }
        ethSwitch.AddMember("ports", std::move(ports), ethSwitchAlloc);
    }

    for (const auto &device : deviceInfoList) {
        deviceInfo.AddMember(
            rapidjson::Value().SetString(device.first.c_str(),
                                         device.first.length(), alloc),
            rapidjson::Value().SetString(device.second.c_str(),
                                         device.second.length(), alloc),
            alloc);
    }

    deviceInfo.AddMember("capabilities", capabilities, alloc);
    deviceInfo.AddMember("ethSwitch", ethSwitch, alloc);
    deviceInfo.AddMember("accessoryCards", accessoryCards, alloc);
    rapidjson::Document inp;
    auto &inpAlloc = inp.GetAllocator();
    inp.SetArray();
    for (const auto &input : dInputs) {
        rapidjson::Value value;
        value.SetString(input.c_str(), input.length(), inpAlloc);
        inp.PushBack(value, inpAlloc);
    }
    rapidjson::Document out;
    auto &outAlloc = out.GetAllocator();
    out.SetArray();
    for (const auto &output : dOutputs) {
        rapidjson::Value value;
        value.SetString(output.c_str(), output.length(), outAlloc);
        out.PushBack(value, outAlloc);
    }
    rapidjson::Document extIo;
    extIo.SetObject();
    auto &extAlloc = extIo.GetAllocator();
    extIo.AddMember(KEY_DINPUTS, inp, extAlloc);
    extIo.AddMember(KEY_DOUTPUTS, out, extAlloc);
    deviceInfo.AddMember(KEY_EXTIO, extIo, extAlloc);
}

void Device::mapFileToCapability() {
    if (fileType("/opt/node-red") == S_IFDIR) { /* node-red is a directory */
        capabilityList["nodeRed"] = true;
    }
    if (fileType("/opt/lora/lora-network-server") ==
        S_IFREG) { /* lora-network-server is a regular file */
        capabilityList["loraNetworkServer"] = true;
    }
    if (capabilityList["cell"]) { /* only on devices with Cellular */
        if (fileType("/dev/cdc-wdm0") == S_IFCHR) {
            /* Cellular modem is wwan/qmi/mbim character device */
            capabilityList["cellWwan"] = true;
        }
        if (!fileExists("/dev/modem_at0") && fileType("/dev/modem_at1") == S_IFCHR) {
            /* Cellular modem without PPP support, probably uses ECM WWAN */
            capabilityList["cellWwan"] = true;
        } else {
            /* all other radios - assume PPP is supported */
            capabilityList["cellPpp"] = true;
        }
    }
    if (fileType("/dev/ext_serial") ==
        S_IFCHR) { /* ext_serial is a character device */
        capabilityList["externalSerialPort"] = true;
    }
    if (fileType("/usr/bin/dockerd") ==
        S_IFREG) { /* Docker is a regular file */
        capabilityList["docker"] = true;
    }
    if (findFileGlob("/dev/tpm*") == S_IFCHR) { /* tpm* is a character device */
        capabilityList["tpm"] = true;
    }
}

void Device::mapMacAddress2() {
    std::ifstream file("/sys/devices/platform/mts-io/base/mac-eth");
    if (file.is_open()) {
        std::string line = "";
        std::getline(file, line);
        deviceInfoList["macAddress1"] = line;
    }
}

void Device::mapFirmware() {
    std::ifstream file(FIRMWARE_FILE);
    if (!file.is_open()) {
        return;
    }
    std::string line;
    while (std::getline(file, line)) {
        if (line.find(FIRMWARE_VERSION) != std::string::npos) {
            deviceInfoList["firmware"] = line.substr(line.find(" ") + 1);
        } else if (line.find(FIRMWARE_DATE) != std::string::npos) {
            deviceInfoList["firmwareDate"] = line.substr(line.find(" ") + 1);
        } else if (line.find(FIRMWARE_RELEASE) != std::string::npos) {
            deviceInfoList["firmwareRelease"] = line.substr(line.find(" ") + 1);
        }
    }
}

void Device::printDir(const std::string dir_name,
                      std::vector<std::string> &results) {
    std::string fullPath = SYSFS_PLATFORM + std::string(dir_name);
    DIR *d = opendir(fullPath.c_str());
    if (!d) {
        printError("Cannot open directory %s", fullPath);
        exitHandler(99);
    }
    while (1) {
        struct dirent *entry = readdir(d);
        if (!entry) {
            break;
        }
        const char *d_name = entry->d_name;
        if (!(entry->d_type & DT_DIR)) {
            std::string result;
            if (dir_name.size() > 0) {
                result = (dir_name + "/");
            }
            result.append(d_name);
            results.push_back(result);
        }
        if (isValidDirectory(entry, fullPath,
                             d_name)) { /* Check that the directory is not "d"
                                           or d's parent. */
            printDir(d_name, results);
        }
    }
    if (closedir(d)) { /* After going through all the entries, close the
                          directory. */
        printError("Could not close %s", fullPath);
        exitHandler(errno);
    }
}

void Device::printJson() {
    rapidjson::StringBuffer buffer;
    rapidjson::Writer<rapidjson::StringBuffer> writer(buffer);
    deviceInfo.Accept(writer);
    std::cout << buffer.GetString();
}

void Device::printVersion(std::string name) {
    printInfo(
        "%s %s\nCopyright (C) 2022 by Multi-Tech Systems\nThis program is free "
        "software; you may redistribute it under the terms of\nthe GNU General "
        "Public License version 2 or (at your option) any later version.\nThis "
        "program has absolutely no warranty.",
        name.c_str(), Version::version.c_str());
    exitHandler(0);
}

void Device::printUsage(std::string program) {
    std::vector<std::string> showResults;
    printf("Usage: %s [ OPTIONS ] OBJECT [--] [ ARGUMENTS ]\n", program.c_str());
    printf("Legacy OBJECT options:\n");
    printf("   init                : init & make device info json\n");
    printf("   json                : init & make device info json\n");
    printf("   show                : show data for file\n");
    printf("   show-trigger        : show trigger data for file\n");
    printf("   store               : store data for file\n");
    printf("   store-trigger       : store trigger data for file\n");
    printf("   load-fpga           : load fpga version\n");
    printf("Updated OBJECT options:\n");
    printf("   -I, --init          : init & make device info json\n");
    printf("   -j, --json          : output device info json\n");
    printf("   -s, --show          : show data for file\n");
    printf("   -S, --show-trigger  : show trigger data for file\n");
    printf("   -t, --store         : store data for file\n");
    printf("   -T, --store-trigger : store trigger data for file\n");
    printf("   -l, --load-fpga     : update fpga version\n");
    printf("   -c, --check         : check fpga version\n");
    printf("   -v, --version       : show version\n");
    printf("   -h, --help          : show help\n");
    printf("\n");
    printf("Options\n");
    printf("   -V, --verbose       : show additional debug output\n");
    printf("FPGA\n");
    printf("Arguments:\n");
    printf("   -p, --path          : path for card\n");
    printf("                       : options: 1 for ap1, 2 for ap2 everything else\n");
    printf("                       : is an expected full path. i.e. /dev/spidevX.X\n");
    printf("   -i, --input         : input file for upgrade\n");
    printf("                       : files are stored in /usr/lib/mts-flash-binaries\n");
    printf("   -u, --duration      : optional field for <store> operation. it defines in milliseconds\n");
    printf("Usage:\n");
    printf("   Load                : mts-io-sysfs -l -p <path> -i <file>\n");
    printf("   Check               : mts-io-sysfs -c -p <path>\n");
    printf("\n");
    printf("show-name:\n");
    printf("Usage:\n");
    printf("--show-name <name>\n");
    printDir("", showResults);
    sort(showResults.begin(),
         showResults.end()); // Unix file tree is not sorted

    for (std::string showResult : showResults) {
        if (!regex_match(showResult, showFilters))
            printf("          %s\n", showResult.c_str());
    }
    printf("\n");
    printf("store-name:\n");
    printf("Usage:\n");
    printf("--store-name <name> <value>\n");
    for (std::string showResult : showResults) {
        if (showResult == "radio-reset") {
            printf("          %s { 0 }\n", showResult.c_str());
        } else if (showResult == "reset-monitor") {
            printf("          %s { pid short-signal long-signal "
                   "[extra-long-signal] }\n",
                   showResult.c_str());
        } else if (showResult == "reset-monitor-intervals") {
            printf("          %s { short-interval long-interval }\n",
                   showResult.c_str());
        } else if (regex_match(showResult, serialModeFilter)) {
            printf("          %s { loopback | rs232 | rs485-half | "
                   "rs422-485-full }\n",
                   showResult.c_str());
        } else if (!regex_match(showResult, storeFilters)) {
            printf("          %s BOOLEAN\n", showResult.c_str());
        }
    }
    printf("\n");
    exitHandler(0);
}

/*
 * Print an error message with errno string
 * and exit with internal identifying number.
 * parm1:   Message to be printed
 * parm2:   Saved errno value
 * parm3:   An integer exit value (-1 means don't exit)
 * Returns: Void
 */
const int NOEXIT = -1;
void Device::simpleError(std::string msg, int error, int exitval) {
    std::cerr << cmdname;
    std::cerr << ": ";
    std::cerr << msg;
    std::cerr << ": ";
    const int len = 512;
    char buf[len];
    std::cerr << strerror_r(error,buf,len);
    std::cerr << "\n";
    if (exitval > NOEXIT)
        exitHandler(exitval);
}

/*
 * Given a GPIO name, find the chip and line number
 * parm1:   Name of GPIO
 * parm2:   pointer to GPIO offset where the name
 *          was found on return
 * Returns: chip where GPIO name was found
 *
 * Caller should free the chip pointer with
 * gpiod_chip_close.
 *
 * It is assumed the gpio devices are numbered
 * starting at 0, and are all sequential.
 *
 * This function was in the old libgpiod and
 * was removed from the new library. This
 * functionality should not have been removed.
 */
struct gpiod_chip * Device::gpio_request::gpiod_ctxless_find_line(Device *device, std::string name, unsigned int *r_offset)
{
    const std::string gpioDevPrefix = "/dev/gpiochip";
    int chipnum;
    char *gpiodevname = NULL;
    struct gpiod_chip *found_chip;
    struct gpiod_chip_info *chip_info;
    struct gpiod_line_info *info;
    int num_lines = 0;
    int offset;
    const char *nm;
    Device d;

    for(chipnum=0;1;chipnum++) {
	std::string gpioDevName = gpioDevPrefix;
	gpioDevName += std::to_string(chipnum);
        found_chip = gpiod_chip_open(gpioDevName.c_str());
        if (found_chip == NULL) {
            if(chipnum == 0) {
                int error = errno;
                std::string msg = "Could not open ";
                msg.append(gpiodevname);
                device->simpleError(msg,error,NOEXIT);
            }
            free(gpiodevname);
            gpiodevname = NULL;
            break;
        }

        chip_info = gpiod_chip_get_info(found_chip);
        if (!chip_info) {
            int error = errno;
            std::string msg = "Can't read info from GPIO ";
            msg.append(gpiodevname);
            device->simpleError(msg,error,100);
        }
        num_lines = gpiod_chip_info_get_num_lines(chip_info);
        gpiod_chip_info_free(chip_info);
        free(gpiodevname);
        for (offset = 0; offset < num_lines; offset++) {
            info = gpiod_chip_get_line_info(found_chip, offset);
            nm = gpiod_line_info_get_name(info);
            if (nm && (name.compare(nm) == 0)) {
                *r_offset = offset;
                gpiod_line_info_free(info);
                return found_chip;  // Caller must close chip
            }
            gpiod_line_info_free(info);

        }
        gpiod_chip_close(found_chip);
    }
    *r_offset = 0xffffffff;
    return NULL;
}

Device::gpio_request:: gpio_request(Device *device, const std::string name)
{
    line_request = NULL;
    settings = NULL;
    line_config = NULL;
    request_config = NULL;

    if(name.empty())
        device->simpleError("Name not provided\n",EINVAL,101);
    chip = gpiod_ctxless_find_line(device, name, &rq_offset);
    if(chip == NULL)
        return;
    request_config = gpiod_request_config_new();
    if (request_config == NULL)
        device->simpleError("Could not allocate gpiod request_config", errno, 102);
    gpiod_request_config_set_consumer(request_config,"mts-io-sysfs");
    line_config = gpiod_line_config_new();
    if (line_config == NULL)
        device->simpleError("Could not allocate gpiod line_config", errno, 103);
    settings = gpiod_line_settings_new();
    if (settings == NULL)
        device->simpleError("Could not allocate gpiod line_settings", errno, 104);
    int result = -1;
    result = gpiod_line_settings_set_direction(settings,GPIOD_LINE_DIRECTION_AS_IS);
    if (result == -1)
        device->simpleError("Could not set direction gpiod line_settings_set_direction GPIOD_LINE_DIRECTION_AS_IS", errno, 105);

    result = gpiod_line_settings_set_bias(settings,GPIOD_LINE_BIAS_AS_IS);
    if (result == -1)
        device->simpleError("Could not set bias gpiod line_settings_set_bias GPIOD_LINE_BIAS_AS_IS", errno, 106);

    unsigned int offsets[1];
    size_t num_offsets = 1;
    offsets[0] = rq_offset; // Exactly one GPIO is being queried

    result = gpiod_line_config_add_line_settings(line_config,offsets,num_offsets,settings);
    if (result == -1)
        device->simpleError("Could not add line settings gpiod line_config_add_line_settings", errno, 107);

    line_request = gpiod_chip_request_lines(chip,request_config,line_config);  // acquire line(s) for exclusive usage.
    if (line_request == NULL)
        device->simpleError("Could not request lines gpiod chip_request_lines", errno, 108);
}
Device::gpio_request:: ~gpio_request()
{
    if(line_request)
        gpiod_line_request_release(line_request);
    if(settings)
        gpiod_line_settings_free(settings);
    if(line_config)
        gpiod_line_config_free(line_config);
    if(request_config)
        gpiod_request_config_free(request_config);
    if(chip)
        gpiod_chip_close(chip);
}

struct gpiod_line_request * Device::gpio_request::request()
{
    /* This value can be NULL if the gpio name was
     * not found.
     */
    return this->line_request;
};

unsigned int Device::gpio_request::offset()
{
    return this->rq_offset;
};


/* If the name starts in upper case, assume
 * the name is a GPIO line name from gpio-hog
 * in device tree.  If it starts in lower case
 * assume the name is an attribute of the mts-io
 * driver. GPIOs can only be zero
 * or one, never a text string.
 */
void Device::show(std::string name) {
    std::string fileData;
    if(isupper(name[0])) {
        gpio_request gr(this, name);
        if (gr.request()) {
            enum gpiod_line_value lv = gpiod_line_request_get_value(gr.request(),gr.offset());
            if(lv != GPIOD_LINE_VALUE_ERROR) {
                if(lv == GPIOD_LINE_VALUE_INACTIVE)
                    std::cout << "0\n";
                else
                    std::cout << "1\n";
                exitHandler(0);
            } else
                simpleError("Invalid GPIO line value", errno, 109);
        }
    } // Upper case name

    int32_t code = MTS::System::readFile(SYSFS_PLATFORM + name, fileData);
    if (code == 0) {
        printf("%s", fileData.c_str());
        exitHandler(0);
    }
    printError("cat: can't open %s%s: %s",
        SYSFS_PLATFORM, name.c_str(),strerror(errno));
    exitHandler(99);
}  // End of show

void Device::showTrigger(std::string name) {
    std::string fileData;
    int32_t code =
        MTS::System::readFile(LEDS_GPIO_DIR + name + "/trigger", fileData);
    if (code == 0) {
        printf("%s", fileData.c_str());
        exitHandler(0);
    }
    printError("Can't open %s%s/trigger: %s",
                   LEDS_GPIO_DIR, name.c_str(),strerror(errno));
    exitHandler(99);
}

// Prefer gpiod if name starts with upper case and is value 0 or 1
void Device::store(std::string name, std::string value) {
    if (!isRoot) {
        printError("Must be root to store to %s", name.c_str());
        exitHandler(99);
    }

    printDebug("Setting %s to %s", name.c_str(), value.c_str());

    if(isupper(name[0])) {
        enum gpiod_line_value lv = GPIOD_LINE_VALUE_ERROR;

        if (value.compare("0") == 0)
            lv = GPIOD_LINE_VALUE_INACTIVE;
        if (value.compare("1") == 0)
            lv = GPIOD_LINE_VALUE_ACTIVE;
        if (lv != GPIOD_LINE_VALUE_ERROR) {
            gpio_request gr(this, name);
            int retval;
            if (gr.request()) {
                retval = gpiod_line_request_set_value(gr.request(),gr.offset(),lv);

                if(retval == -1) {
                    simpleError("Could not set GPIO value",errno,111);
                }
                return;
            }
        }
    }
    std::ofstream fileToWrite(SYSFS_PLATFORM + name);
    if (fileToWrite.is_open()) {
        fileToWrite << value;
        if (fileToWrite.bad()) {
            printError("Can't write %s%s: %s", SYSFS_PLATFORM,
                   name.c_str(),strerror(errno));
            exitHandler(98);
        }
        fileToWrite.close();
    } else {
        printError("Can't open %s%s: %s", SYSFS_PLATFORM,
                    name.c_str(),strerror(errno));
        exitHandler(99);
    }
}

void Device::storeTrigger(std::string name, std::string value) {
    if (!isRoot) {
        printError("Must be root to storeTrigger to %s/trigger", name.c_str());
        exitHandler(99);
    }
    printDebug("Setting %s to %s", name.c_str(), value.c_str());
    std::ofstream fileToWrite(LEDS_GPIO_DIR + name + "/trigger");
    if (fileToWrite.is_open()) {
        fileToWrite << value;
        if(fileToWrite.bad()) {
            printError("Can't write %s%s/trigger: %s",
                   LEDS_GPIO_DIR, name.c_str(), strerror(errno));
            exitHandler(98);
        }
        fileToWrite.close();
        exitHandler(0);
    }
    printError("Can't open %s%s/trigger: %s",
                   LEDS_GPIO_DIR, name.c_str(), strerror(errno));
    exitHandler(99);
}

void Device::writeJson(const rapidjson::Document &json, const std::string &file) {
    rapidjson::StringBuffer buffer;
    rapidjson::Writer<rapidjson::StringBuffer> writer(buffer);
    json.Accept(writer);
    std::ofstream os(file);
    if (!os.is_open()) {
        printError("Can't write to %s: %s", file.c_str(),strerror(errno));
        exitHandler(99);
    } else {
        os << buffer.GetString();
    }
}

bool Device::readJson(rapidjson::Document &json, const std::string &file) {
    std::ifstream is(file);
    if (!is.is_open()) {
        printDebug("Can't read to %s: %s", file.c_str(), strerror(errno));
        return false;
    }
    rapidjson::IStreamWrapper isw { is };
    json.ParseStream(isw);
    if (json.HasParseError()) {
        printError("%s Parse error", file.c_str());
        return false;
    }
    return true;
}

void Device::storeOutputStateToNonvolatile(const std::string& name, const std::string& value) {
    rapidjson::Document deviceInfo;
    if (!readJson(deviceInfo, DEVICE_INFO_FILE)){
        return;
    }

    if (!deviceInfo.HasMember(KEY_EXTIO)){
        return;
    }
    if (!deviceInfo[KEY_EXTIO].HasMember(KEY_DOUTPUTS)){
        return;
    }
    const rapidjson::Value &outputs = deviceInfo[KEY_EXTIO][KEY_DOUTPUTS];
    bool found = false;
    for (auto itr = outputs.Begin(); itr != outputs.End(); ++itr) {
        auto listedOutput = (*itr).GetString();
        if (name == listedOutput) {
            found = true;
            break;
        }
    }
    if (!found) {
        return;
    }

    rapidjson::Document stateIo;
    rapidjson::Document::AllocatorType &alloc = stateIo.GetAllocator();
    rapidjson::Value jname(name.c_str(), alloc);
    rapidjson::Value jvalue(value.c_str(), alloc);
    readJson( stateIo, STORED_DIGITAL_OUTPUTS_STATE_FILE);
    if (stateIo.IsNull()) {
        stateIo.SetObject();
    };
    if (!stateIo.HasMember(jname)) {
        stateIo.AddMember(jname, jvalue, alloc);
    } else {
        stateIo[jname] = jvalue;
    }
    writeJson(stateIo, STORED_DIGITAL_OUTPUTS_STATE_FILE);
}