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/*
// Copyright (c) 2014 Intel 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 <poll.h>
#include <sys/socket.h>
#include <sys/un.h>
#include <sys/queue.h>
#include <linux/netlink.h>
#include <sys/types.h>
#include <unistd.h>
#include <DrmConfig.h>
#include <common/utils/HwcTrace.h>
#include <UeventObserver.h>
namespace android {
namespace intel {
UeventObserver::UeventObserver()
: mUeventFd(-1),
mExitRDFd(-1),
mExitWDFd(-1),
mListeners()
{
}
UeventObserver::~UeventObserver()
{
deinitialize();
}
bool UeventObserver::initialize()
{
mListeners.clear();
if (mUeventFd != -1) {
return true;
}
mThread = new UeventObserverThread(this);
if (!mThread.get()) {
ELOGTRACE("failed to create uevent observer thread");
return false;
}
// init uevent socket
struct sockaddr_nl addr;
// set the socket receive buffer to 64K
// NOTE: this is only called for once
int sz = 64 * 1024;
memset(&addr, 0, sizeof(addr));
addr.nl_family = AF_NETLINK;
addr.nl_pid = pthread_self() | getpid();
addr.nl_groups = 0xffffffff;
mUeventFd = socket(PF_NETLINK, SOCK_DGRAM, NETLINK_KOBJECT_UEVENT);
if (mUeventFd < 0) {
DEINIT_AND_RETURN_FALSE("failed to create uevent socket");
}
if (setsockopt(mUeventFd, SOL_SOCKET, SO_RCVBUFFORCE, &sz, sizeof(sz))) {
WLOGTRACE("setsockopt() failed");
//return false;
}
if (bind(mUeventFd, (struct sockaddr *) &addr, sizeof(addr)) < 0) {
DEINIT_AND_RETURN_FALSE("failed to bind scoket");
return false;
}
memset(mUeventMessage, 0, UEVENT_MSG_LEN);
int exitFds[2];
if (pipe(exitFds) < 0) {
ELOGTRACE("failed to make pipe");
deinitialize();
return false;
}
mExitRDFd = exitFds[0];
mExitWDFd = exitFds[1];
return true;
}
void UeventObserver::deinitialize()
{
if (mUeventFd != -1) {
if (mExitWDFd != -1) {
close(mExitWDFd);
mExitWDFd = -1;
}
close(mUeventFd);
mUeventFd = -1;
}
if (mThread.get()) {
mThread->requestExitAndWait();
mThread = NULL;
}
while (!mListeners.isEmpty()) {
UeventListener *listener = mListeners.valueAt(0);
mListeners.removeItemsAt(0);
delete listener;
}
}
void UeventObserver::start()
{
if (mThread.get()) {
mThread->run("UeventObserver", PRIORITY_URGENT_DISPLAY);
}
}
void UeventObserver::registerListener(const char *event, UeventListenerFunc func, void *data)
{
if (!event || !func) {
ELOGTRACE("invalid event string or listener to register");
return;
}
String8 key(event);
if (mListeners.indexOfKey(key) >= 0) {
ELOGTRACE("listener for uevent %s exists", event);
return;
}
UeventListener *listener = new UeventListener;
if (!listener) {
ELOGTRACE("failed to create Uevent Listener");
return;
}
listener->func = func;
listener->data = data;
mListeners.add(key, listener);
}
bool UeventObserver::threadLoop()
{
if (mUeventFd == -1) {
ELOGTRACE("invalid uEvent file descriptor");
return false;
}
struct pollfd fds[2];
int nr;
fds[0].fd = mUeventFd;
fds[0].events = POLLIN;
fds[0].revents = 0;
fds[1].fd = mExitRDFd;
fds[1].events = POLLIN;
fds[1].revents = 0;
nr = poll(fds, 2, -1);
if (nr > 0 && fds[0].revents == POLLIN) {
int count = recv(mUeventFd, mUeventMessage, UEVENT_MSG_LEN - 2, 0);
if (count > 0) {
onUevent();
}
} else if (fds[1].revents) {
close(mExitRDFd);
mExitRDFd = -1;
ILOGTRACE("exiting wait");
return false;
}
// always looping
return true;
}
void UeventObserver::onUevent()
{
char *msg = mUeventMessage;
const char *envelope = DrmConfig::getUeventEnvelope();
if (strncmp(msg, envelope, strlen(envelope)) != 0)
return;
msg += strlen(msg) + 1;
UeventListener *listener;
String8 key;
while (*msg) {
key = String8(msg);
if (mListeners.indexOfKey(key) >= 0) {
DLOGTRACE("received Uevent: %s", msg);
listener = mListeners.valueFor(key);
if (listener) {
listener->func(listener->data);
} else {
ELOGTRACE("no listener for uevent %s", msg);
}
}
msg += strlen(msg) + 1;
}
}
} // namespace intel
} // namespace android
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