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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 <linux/netlink.h>
#include <sys/socket.h>
#include <xf86drm.h>
#include <cassert>
#include <cerrno>
#include <cstring>
#include "utils/log.h"
/* Originally defined in system/core/libsystem/include/system/graphics.h */
#define HAL_PRIORITY_URGENT_DISPLAY (-8)
namespace android {
UEventListener::UEventListener()
: Worker("uevent-listener", HAL_PRIORITY_URGENT_DISPLAY){};
int UEventListener::Init() {
uevent_fd_ = UniqueFd(
socket(PF_NETLINK, SOCK_DGRAM | SOCK_CLOEXEC, NETLINK_KOBJECT_UEVENT));
if (!uevent_fd_) {
// NOLINTNEXTLINE(concurrency-mt-unsafe): Fixme
ALOGE("Failed to open uevent socket: %s", strerror(errno));
return -errno;
}
struct sockaddr_nl addr {};
addr.nl_family = AF_NETLINK;
addr.nl_pid = 0;
addr.nl_groups = 0xFFFFFFFF;
int ret = bind(uevent_fd_.Get(), (struct sockaddr *)&addr, sizeof(addr));
if (ret) {
// NOLINTNEXTLINE(concurrency-mt-unsafe): Fixme
ALOGE("Failed to bind uevent socket: %s", strerror(errno));
return -errno;
}
return InitWorker();
}
void UEventListener::Routine() {
char buffer[1024];
ssize_t ret = 0;
while (true) {
ret = read(uevent_fd_.Get(), &buffer, sizeof(buffer));
if (ret == 0)
return;
if (ret < 0) {
ALOGE("Got error reading uevent %zd", ret);
return;
}
if (!hotplug_handler_)
continue;
bool drm_event = false;
bool hotplug_event = false;
for (uint32_t i = 0; i < ret;) {
char *event = buffer + i;
if (strcmp(event, "DEVTYPE=drm_minor") != 0)
drm_event = true;
else if (strcmp(event, "HOTPLUG=1") != 0)
hotplug_event = true;
i += strlen(event) + 1;
}
if (drm_event && hotplug_event && hotplug_handler_) {
constexpr useconds_t delay_after_uevent_us = 200000;
/* We need some delay to ensure DrmConnector::UpdateModes() will query
* correct modes list, otherwise at least RPI4 board may report 0 modes */
usleep(delay_after_uevent_us);
hotplug_handler_();
}
}
}
} // namespace android
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