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/*
* Copyright (C) 2016 The Android Open Source Project
*
* 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.
*/
#define LOG_TAG "hwc-uevent-listener"
#include "UEventListener.h"
#include <thread>
#include "utils/log.h"
namespace android {
auto UEventListener::CreateInstance() -> std::shared_ptr<UEventListener> {
auto uel = std::shared_ptr<UEventListener>(new UEventListener());
uel->uevent_ = UEvent::CreateInstance();
if (!uel->uevent_)
return {};
std::thread(&UEventListener::ThreadFn, uel.get(), uel).detach();
return uel;
}
void UEventListener::ThreadFn(const std::shared_ptr<UEventListener> &uel) {
// TODO(nobody): Rework code to allow stopping the thread (low priority)
while (true) {
if (uel.use_count() == 1)
break;
auto uevent_str = uel->uevent_->ReadNext();
if (!hotplug_handler_ || !uevent_str)
continue;
auto drm_event = uevent_str->find("DEVTYPE=drm_minor") != std::string::npos;
auto hotplug_event = uevent_str->find("HOTPLUG=1") != std::string::npos;
if (drm_event && hotplug_event) {
constexpr useconds_t kDelayAfterUeventUs = 200000;
/* We need some delay to ensure DrmConnector::UpdateModes() will query
* correct modes list, otherwise at least RPI4 board may report 0 modes */
usleep(kDelayAfterUeventUs);
hotplug_handler_();
}
}
ALOGI("UEvent thread exit");
}
} // namespace android
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