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/*
* Copyright 2022 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.
*/
#include "DrmEventListener.h"
#include <linux/netlink.h>
#include <sys/socket.h>
namespace aidl::android::hardware::graphics::composer3::impl {
std::unique_ptr<DrmEventListener> DrmEventListener::create(::android::base::borrowed_fd drmFd,
std::function<void()> callback) {
std::unique_ptr<DrmEventListener> listener(new DrmEventListener(std::move(callback)));
if (!listener->init(drmFd)) {
return nullptr;
}
return listener;
}
bool DrmEventListener::init(::android::base::borrowed_fd drmFd) {
mEventFd = ::android::base::unique_fd(socket(PF_NETLINK, SOCK_DGRAM, NETLINK_KOBJECT_UEVENT));
if (!mEventFd.ok()) {
ALOGE("Failed to open uevent socket: %s", strerror(errno));
return false;
}
struct sockaddr_nl addr;
memset(&addr, 0, sizeof(addr));
addr.nl_family = AF_NETLINK;
addr.nl_pid = 0;
addr.nl_groups = 0xFFFFFFFF;
int ret = bind(mEventFd, (struct sockaddr*)&addr, sizeof(addr));
if (ret) {
ALOGE("Failed to bind uevent socket: %s", strerror(errno));
return false;
}
FD_ZERO(&mMonitoredFds);
FD_SET(drmFd.get(), &mMonitoredFds);
FD_SET(mEventFd.get(), &mMonitoredFds);
mMaxMonitoredFd = std::max(drmFd.get(), mEventFd.get());
mThread = std::thread([this]() { threadLoop(); });
return true;
}
void DrmEventListener::threadLoop() {
int ret;
do {
ret = select(mMaxMonitoredFd + 1, &mMonitoredFds, NULL, NULL, NULL);
} while (ret == -1 && errno == EINTR);
if (!FD_ISSET(mEventFd.get(), &mMonitoredFds)) {
ALOGE("%s: DrmEventListevener event fd unset?", __FUNCTION__);
return;
}
char buffer[1024];
while (true) {
ssize_t ret = read(mEventFd.get(), &buffer, sizeof(buffer));
if (ret == 0) {
return;
} else if (ret < 0) {
ALOGE("Got error reading uevent %zd", ret);
return;
}
bool drmEvent = false, hotplugEvent = false;
for (int i = 0; i < ret;) {
char* event = buffer + i;
if (strcmp(event, "DEVTYPE=drm_minor")) {
drmEvent = true;
} else if (strcmp(event, "HOTPLUG=1")) {
hotplugEvent = true;
}
i += strlen(event) + 1;
}
if (drmEvent && hotplugEvent) {
DEBUG_LOG("DrmEventListener detected hotplug event .");
mOnEventCallback();
}
}
}
} // namespace aidl::android::hardware::graphics::composer3::impl
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