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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/logging.h"
#include "base/stl_util.h"
#include "chrome/browser/usb/usb_device.h"
#include "third_party/libusb/libusb.h"
// The UsbEventHandler works around a design flaw in the libusb interface. There
// is currently no way to signal to libusb that any caller into one of the event
// handler calls should return without handling any events.
class UsbEventHandler : public base::PlatformThread::Delegate {
public:
explicit UsbEventHandler(PlatformUsbContext context)
: running_(true), context_(context) {
base::PlatformThread::CreateNonJoinable(0, this);
}
virtual ~UsbEventHandler() {}
virtual void ThreadMain() {
base::PlatformThread::SetName("UsbEventHandler");
DLOG(INFO) << "UsbEventHandler started.";
while (running_) {
libusb_handle_events(context_);
}
DLOG(INFO) << "UsbEventHandler shutting down.";
libusb_exit(context_);
delete this;
}
void Stop() {
running_ = false;
}
private:
bool running_;
PlatformUsbContext context_;
DISALLOW_EVIL_CONSTRUCTORS(UsbEventHandler);
};
UsbService::UsbService() {
libusb_init(&context_);
event_handler_ = new UsbEventHandler(context_);
}
UsbService::~UsbService() {}
void UsbService::Cleanup() {
event_handler_->Stop();
event_handler_ = NULL;
}
UsbDevice* UsbService::FindDevice(const uint16 vendor_id,
const uint16 product_id) {
DCHECK(event_handler_) << "FindDevice called after event handler stopped.";
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(event_handler_) << "CloseDevice called after event handler stopped.";
for (DeviceMap::iterator i = devices_.begin(); i != devices_.end(); ++i) {
if (i->second.get() == device.get()) {
devices_.erase(i);
libusb_close(device->handle());
return;
}
}
}
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