/*
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* Copyright (C) 2008 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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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <errno.h>
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#include <sys/un.h>
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#include <sys/socket.h>
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#include <linux/netlink.h>
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#include <cutils/log.h>
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#include <sysutils/NetlinkEvent.h>
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#include "hotplug_monitor.h"
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HotplugMonitor::HotplugMonitor(const Callback *cb, int sockfd)
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: NetlinkListener(sockfd, NetlinkListener::NETLINK_FORMAT_ASCII),
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mSocket(sockfd),
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mCallback(cb)
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{
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this->startListener();
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}
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HotplugMonitor::~HotplugMonitor()
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{
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this->stopListener();
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close(mSocket);
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}
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void
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HotplugMonitor::onEvent(NetlinkEvent *event)
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{
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const char *subsys = event->getSubsystem();
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if (!subsys) {
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ALOGE("No subsystem found in netlink event");
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return;
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}
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#ifndef SUNXI_USE_LEGACY_KERNEL
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const char* prefix[] = {"extcon", "NAME", "STATE"};
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#else
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const char* prefix[] = {"switch", "SWITCH_NAME", "SWITCH_STATE"};
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#endif
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if (!strcmp(subsys, prefix[0])) {
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if (event->getAction() == NetlinkEvent::Action::kChange) {
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const char *name = event->findParam(prefix[1]);
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const char *state = event->findParam(prefix[2]);
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if((NULL == name) || (NULL == state)) {
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ALOGE("null point: name=%s, state=%s.", name, state);
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return;
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}
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ALOGD("hotplug change: name=%s, state=%s ", name, state);
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bool plug = (strstr(state, "1") != NULL);
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notifyHotplugChanged(name, plug);
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} else {
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event->dump();
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}
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}
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return;
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}
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#define NEMLEN(_array) \
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(sizeof(_array) / sizeof(_array[0]))
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static int name2type(const char *name)
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{
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struct deviceTypeMap {
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const char *name; const int type;
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};
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const deviceTypeMap nameTypeArray[] = {
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{"hdmi", 4},
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{"cvbs", 2},
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};
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for (size_t i = 0; i < NEMLEN(nameTypeArray); i++) {
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if (strcmp(name, nameTypeArray[i].name) == 0)
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return nameTypeArray[i].type;
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}
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return -1;
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}
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void
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HotplugMonitor::notifyHotplugChanged(const char *name, int connected)
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{
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ALOGD("HotplugMonitor: %s connected=%d", name, connected);
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if (mCallback)
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mCallback->hotplug(mCallback, name2type(name), connected);
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return;
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}
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int
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HotplugMonitor::createUeventSocket(void)
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{
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struct sockaddr_nl addr;
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int sz = 64*1024;
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int on = 1;
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int sockfd;
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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 = ~getpid();
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addr.nl_groups = 0xffffffff;
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sockfd = socket(PF_NETLINK, SOCK_DGRAM, NETLINK_KOBJECT_UEVENT);
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if(sockfd < 0) {
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ALOGE("create socket error: %s(%d)", strerror(errno), errno);
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return -1;
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}
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if (setsockopt(sockfd, SOL_SOCKET, SO_RCVBUF, &sz, sizeof(sz)) < 0) {
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ALOGE("setsockopt(SO_RCVBUF) error: %s(%d)", strerror(errno), errno);
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close(sockfd);
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return -1;
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}
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if (setsockopt(sockfd, SOL_SOCKET, SO_PASSCRED, &on, sizeof(on)) < 0) {
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ALOGE("setsockopt(SO_PASSCRED) error: %s(%d)", strerror(errno), errno);
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close(sockfd);
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return -1;
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}
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if(bind(sockfd, (struct sockaddr *) &addr, sizeof(addr)) < 0) {
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ALOGE("bind error: %s(%d)", strerror(errno), errno);
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close(sockfd);
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return 0;
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}
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return sockfd;
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}
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