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// Copyright (c) 2012 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.
#include "chrome/browser/usb/usb_service.h"
#include "base/bind.h"
#include "base/bind_helpers.h"
#include "base/stl_util.h"
#include "chrome/browser/usb/usb_device.h"
#include "third_party/libusb/libusb/libusb.h"
UsbService::UsbService() : running_(true), thread_("UsbThread") {
libusb_init(&context_);
thread_.Start();
PostHandleEventTask();
}
UsbService::~UsbService() {}
// TODO(gdk): There is currently no clean way to indicate to the event handler
// thread that it must break out of the handling loop before the event timeout,
// therefore we currently are at the whim of the event handler timeout before
// the message handling thread can be joined.
void UsbService::Cleanup() {
running_ = false;
if (!devices_.empty()) {
libusb_close(devices_.begin()->second->handle());
} else {
LOG(WARNING) << "UsbService cannot force the USB event-handler thread to "
<< "exit because there are no open devices with which to "
<< "manipulate it. It maybe take up to 60 (!) seconds for the "
<< "thread to join from this point.";
}
thread_.message_loop()->PostTask(FROM_HERE, base::Bind(
&UsbService::PlatformShutdown, base::Unretained(this)));
}
UsbDevice* UsbService::FindDevice(const uint16 vendor_id,
const uint16 product_id) {
const std::pair<uint16, uint16> key = std::make_pair(vendor_id, product_id);
if (ContainsKey(devices_, key)) {
return devices_[key];
}
libusb_device_handle* const handle = libusb_open_device_with_vid_pid(
context_, vendor_id, product_id);
if (!handle) {
return NULL;
}
UsbDevice* const device = new UsbDevice(this, handle);
devices_[key] = device;
return device;
}
void UsbService::CloseDevice(scoped_refptr<UsbDevice> device) {
DCHECK(running_) << "Cannot close device after service has stopped running.";
for (DeviceMap::iterator i = devices_.begin(); i != devices_.end(); ++i) {
if (i->second.get() == device.get()) {
devices_.erase(i);
libusb_close(device->handle());
return;
}
}
}
void UsbService::PostHandleEventTask() {
thread_.message_loop()->PostTask(FROM_HERE, base::Bind(
&UsbService::HandleEvent, base::Unretained(this)));
}
void UsbService::HandleEvent() {
libusb_handle_events_completed(context_, NULL);
if (running_) {
PostHandleEventTask();
}
}
void UsbService::PlatformShutdown() {
libusb_exit(context_);
}
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