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/**
* Copyright © 2016,2018 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 "physical.hpp"
#include <cassert>
#include <iostream>
#include <string>
namespace phosphor
{
namespace led
{
/** @brief Populates key parameters */
void Physical::setInitialState()
{
assert = led.getMaxBrightness();
auto trigger = led.getTrigger();
if (trigger == "timer")
{
// LED is blinking. Get the on and off delays and derive percent duty
auto delayOn = led.getDelayOn();
periodMs = delayOn + led.getDelayOff();
auto percentScale = periodMs / 100;
this->dutyOn(delayOn / percentScale);
}
else
{
// TODO: Periodicity is hardcoded for now. This will be changed to
// this->period() when configurable periodicity is implemented.
periodMs = 1000;
// Cache current LED state
auto brightness = led.getBrightness();
if (brightness == assert)
{
sdbusplus::xyz::openbmc_project::Led::server::Physical::state(
Action::On);
}
else
{
sdbusplus::xyz::openbmc_project::Led::server::Physical::state(
Action::Off);
}
}
return;
}
auto Physical::state(Action value) -> Action
{
auto current =
sdbusplus::xyz::openbmc_project::Led::server::Physical::state();
auto requested =
sdbusplus::xyz::openbmc_project::Led::server::Physical::state(value);
driveLED(current, requested);
return value;
}
void Physical::driveLED(Action current, Action request)
{
if (current == request)
{
return;
}
if (request == Action::On || request == Action::Off)
{
return stableStateOperation(request);
}
assert(request == Action::Blink);
blinkOperation();
}
void Physical::stableStateOperation(Action action)
{
auto value = (action == Action::On) ? assert : DEASSERT;
led.setTrigger("none");
led.setBrightness(value);
return;
}
void Physical::blinkOperation()
{
auto dutyOn = this->dutyOn();
// Convert percent duty to milliseconds for sysfs interface
auto factor = periodMs / 100;
led.setDelayOn(dutyOn * factor);
led.setDelayOff((100 - dutyOn) * factor);
led.setTrigger("timer");
return;
}
} // namespace led
} // namespace phosphor
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