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/**
* Copyright © 2016 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 "argument.hpp"
#include "physical.hpp"
#include "sysfs.hpp"
#include <boost/algorithm/string.hpp>
#include <algorithm>
#include <iostream>
#include <string>
static void exitWithError(const char* err, char** argv)
{
phosphor::led::ArgumentParser::usage(argv);
std::cerr << std::endl;
std::cerr << "ERROR: " << err << std::endl;
exit(-1);
}
struct LedDescr
{
std::string devicename;
std::string color;
std::string function;
};
/** @brief parse LED name in sysfs
* Parse sysfs LED name in format "devicename:colour:function"
* or "devicename:colour" or "devicename" and sets corresponding
* fields in LedDescr struct.
*
* @param[in] name - LED name in sysfs
* @param[out] ledDescr - LED description
*/
void getLedDescr(const std::string& name, LedDescr& ledDescr)
{
std::vector<std::string> words;
boost::split(words, name, boost::is_any_of(":"));
try
{
ledDescr.devicename = words.at(0);
ledDescr.color = words.at(1);
ledDescr.function = words.at(2);
}
catch (const std::out_of_range&)
{
return;
}
}
/** @brief generates LED DBus name from LED description
*
* @param[in] name - LED description
* @return - DBus LED name
*/
std::string getDbusName(const LedDescr& ledDescr)
{
std::vector<std::string> words;
words.emplace_back(ledDescr.devicename);
if (!ledDescr.function.empty())
{
words.emplace_back(ledDescr.function);
}
if (!ledDescr.color.empty())
{
words.emplace_back(ledDescr.color);
}
return boost::join(words, "_");
}
int main(int argc, char** argv)
{
namespace fs = std::filesystem;
static constexpr auto busParent = "xyz.openbmc_project.LED.Controller";
static constexpr auto objParent = "/xyz/openbmc_project/led/physical";
static constexpr auto devParent = "/sys/class/leds/";
// Read arguments.
auto options = phosphor::led::ArgumentParser(argc, argv);
// Parse out Path argument.
if (options["path"].empty())
{
exitWithError("Path not specified.", argv);
}
auto path = options["path"];
// If the LED has a hyphen in the name like: "one-two", then it gets passed
// as /one/two/ as opposed to /one-two to the service file. There is a
// change needed in systemd to solve this issue and hence putting in this
// work-around.
// Since this application always gets invoked as part of a udev rule,
// it is always guaranteed to get /sys/class/leds/one/two
// and we can go beyond leds/ to get the actual LED name.
// Refer: systemd/systemd#5072
// On an error, this throws an exception and terminates.
auto name = path.substr(strlen(devParent));
// LED names may have a hyphen and that would be an issue for
// dbus paths and hence need to convert them to underscores.
std::replace(name.begin(), name.end(), '/', '-');
path = devParent + name;
// Convert to lowercase just in case some are not and that
// we follow lowercase all over
std::transform(name.begin(), name.end(), name.begin(), ::tolower);
// LED names may have a hyphen and that would be an issue for
// dbus paths and hence need to convert them to underscores.
std::replace(name.begin(), name.end(), '-', '_');
// Convert LED name in sysfs into DBus name
LedDescr ledDescr;
getLedDescr(name, ledDescr);
name = getDbusName(ledDescr);
// Unique bus name representing a single LED.
auto busName = std::string(busParent) + '.' + name;
auto objPath = std::string(objParent) + '/' + name;
// Get a handle to system dbus.
auto bus = sdbusplus::bus::new_default();
sdbusplus::server::manager_t manager{bus, objPath.c_str()};
// Create the Physical LED objects for directing actions.
// Need to save this else sdbusplus destructor will wipe this off.
phosphor::led::SysfsLed sled{fs::path(path)};
phosphor::led::Physical led(bus, objPath, sled, ledDescr.color);
/** @brief Claim the bus */
bus.request_name(busName.c_str());
/** @brief Wait for client requests */
while (true)
{
// Handle dbus message / signals discarding unhandled
bus.process_discard();
bus.wait();
}
return 0;
}