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// Copyright 2013 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
// libudev is used for monitoring device changes.
#include "content/browser/device_monitor_udev.h"
#include <string>
#include "base/system_monitor/system_monitor.h"
#include "content/browser/udev_linux.h"
#include "content/public/browser/browser_thread.h"
#include "device/udev_linux/udev.h"
namespace {
struct SubsystemMap {
base::SystemMonitor::DeviceType device_type;
const char* subsystem;
const char* devtype;
};
const char kAudioSubsystem[] = "sound";
const char kVideoSubsystem[] = "video4linux";
// Add more subsystems here for monitoring.
const SubsystemMap kSubsystemMap[] = {
{ base::SystemMonitor::DEVTYPE_AUDIO_CAPTURE, kAudioSubsystem, NULL },
{ base::SystemMonitor::DEVTYPE_VIDEO_CAPTURE, kVideoSubsystem, NULL },
};
} // namespace
namespace content {
DeviceMonitorLinux::DeviceMonitorLinux() {
DCHECK(BrowserThread::IsMessageLoopValid(BrowserThread::IO));
BrowserThread::PostTask(BrowserThread::IO,
FROM_HERE,
base::Bind(&DeviceMonitorLinux::Initialize, base::Unretained(this)));
}
DeviceMonitorLinux::~DeviceMonitorLinux() {
}
void DeviceMonitorLinux::Initialize() {
DCHECK_CURRENTLY_ON(BrowserThread::IO);
// We want to be notified of IO message loop destruction to delete |udev_|.
base::MessageLoop::current()->AddDestructionObserver(this);
std::vector<UdevLinux::UdevMonitorFilter> filters;
for (size_t i = 0; i < arraysize(kSubsystemMap); ++i) {
filters.push_back(UdevLinux::UdevMonitorFilter(
kSubsystemMap[i].subsystem, kSubsystemMap[i].devtype));
}
udev_.reset(new UdevLinux(filters,
base::Bind(&DeviceMonitorLinux::OnDevicesChanged,
base::Unretained(this))));
}
void DeviceMonitorLinux::WillDestroyCurrentMessageLoop() {
// Called on IO thread.
udev_.reset();
}
void DeviceMonitorLinux::OnDevicesChanged(udev_device* device) {
DCHECK_CURRENTLY_ON(BrowserThread::IO);
DCHECK(device);
base::SystemMonitor::DeviceType device_type =
base::SystemMonitor::DEVTYPE_UNKNOWN;
std::string subsystem(device::udev_device_get_subsystem(device));
for (size_t i = 0; i < arraysize(kSubsystemMap); ++i) {
if (subsystem == kSubsystemMap[i].subsystem) {
device_type = kSubsystemMap[i].device_type;
break;
}
}
DCHECK_NE(device_type, base::SystemMonitor::DEVTYPE_UNKNOWN);
base::SystemMonitor::Get()->ProcessDevicesChanged(device_type);
}
} // namespace content
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