/*
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* Copyright (C) 2016 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#define LOG_TAG "hwc-drm-event-listener"
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#include "drmeventlistener.h"
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#include "drmdevice.h"
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#include <assert.h>
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#include <errno.h>
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#include <linux/netlink.h>
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#include <sys/socket.h>
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#include <hardware/hardware.h>
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#include <hardware/hwcomposer.h>
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#include <log/log.h>
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#include <xf86drm.h>
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namespace android {
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DrmEventListener::DrmEventListener(DrmDevice *drm)
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: Worker("drm-event-listener", HAL_PRIORITY_URGENT_DISPLAY), drm_(drm) {
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}
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int DrmEventListener::Init() {
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uevent_fd_.Set(socket(PF_NETLINK, SOCK_DGRAM, NETLINK_KOBJECT_UEVENT));
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if (uevent_fd_.get() < 0) {
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ALOGE("Failed to open uevent socket %d", uevent_fd_.get());
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return uevent_fd_.get();
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}
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struct sockaddr_nl addr;
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memset(&addr, 0, sizeof(addr));
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addr.nl_family = AF_NETLINK;
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addr.nl_pid = 0;
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addr.nl_groups = 0xFFFFFFFF;
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int ret = bind(uevent_fd_.get(), (struct sockaddr *)&addr, sizeof(addr));
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if (ret) {
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ALOGE("Failed to bind uevent socket %d", -errno);
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return -errno;
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}
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FD_ZERO(&fds_);
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FD_SET(drm_->fd(), &fds_);
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FD_SET(uevent_fd_.get(), &fds_);
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max_fd_ = std::max(drm_->fd(), uevent_fd_.get());
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return InitWorker();
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}
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void DrmEventListener::RegisterHotplugHandler(DrmEventHandler *handler) {
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assert(!hotplug_handler_);
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hotplug_handler_.reset(handler);
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}
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void DrmEventListener::FlipHandler(int /* fd */, unsigned int /* sequence */,
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unsigned int tv_sec, unsigned int tv_usec,
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void *user_data) {
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DrmEventHandler *handler = (DrmEventHandler *)user_data;
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if (!handler)
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return;
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handler->HandleEvent((uint64_t)tv_sec * 1000 * 1000 + tv_usec);
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delete handler;
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}
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void DrmEventListener::UEventHandler() {
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char buffer[1024];
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int ret;
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struct timespec ts;
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uint64_t timestamp = 0;
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ret = clock_gettime(CLOCK_MONOTONIC, &ts);
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if (!ret)
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timestamp = ts.tv_sec * 1000 * 1000 * 1000 + ts.tv_nsec;
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else
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ALOGE("Failed to get monotonic clock on hotplug %d", ret);
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while (true) {
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ret = read(uevent_fd_.get(), &buffer, sizeof(buffer));
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if (ret == 0) {
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return;
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} else if (ret < 0) {
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ALOGE("Got error reading uevent %d", ret);
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return;
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}
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if (!hotplug_handler_)
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continue;
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bool drm_event = false, hotplug_event = false;
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for (int i = 0; i < ret;) {
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char *event = buffer + i;
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if (strcmp(event, "DEVTYPE=drm_minor"))
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drm_event = true;
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else if (strcmp(event, "HOTPLUG=1"))
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hotplug_event = true;
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i += strlen(event) + 1;
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}
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if (drm_event && hotplug_event)
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hotplug_handler_->HandleEvent(timestamp);
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}
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}
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void DrmEventListener::Routine() {
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int ret;
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do {
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ret = select(max_fd_ + 1, &fds_, NULL, NULL, NULL);
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} while (ret == -1 && errno == EINTR);
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if (FD_ISSET(drm_->fd(), &fds_)) {
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drmEventContext event_context =
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{.version = 2,
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.vblank_handler = NULL,
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.page_flip_handler = DrmEventListener::FlipHandler};
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drmHandleEvent(drm_->fd(), &event_context);
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}
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if (FD_ISSET(uevent_fd_.get(), &fds_))
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UEventHandler();
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}
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} // namespace android
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