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// Copyright 2014 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 "device/usb/usb_device_impl.h"
#include <fcntl.h>
#include <stddef.h>
#include <algorithm>
#include "base/bind.h"
#include "base/location.h"
#include "base/posix/eintr_wrapper.h"
#include "base/sequenced_task_runner.h"
#include "base/single_thread_task_runner.h"
#include "base/stl_util.h"
#include "base/threading/thread_restrictions.h"
#include "base/threading/thread_task_runner_handle.h"
#include "build/build_config.h"
#include "components/device_event_log/device_event_log.h"
#include "device/usb/usb_context.h"
#include "device/usb/usb_descriptors.h"
#include "device/usb/usb_device_handle_impl.h"
#include "device/usb/usb_error.h"
#include "device/usb/usb_service.h"
#include "third_party/libusb/src/libusb/libusb.h"
namespace device {
UsbDeviceImpl::UsbDeviceImpl(scoped_refptr<UsbContext> context,
PlatformUsbDevice platform_device,
const libusb_device_descriptor& descriptor)
: UsbDevice(descriptor.bcdUSB,
descriptor.bDeviceClass,
descriptor.bDeviceSubClass,
descriptor.bDeviceProtocol,
descriptor.idVendor,
descriptor.idProduct,
descriptor.bcdDevice,
base::string16(),
base::string16(),
base::string16()),
platform_device_(platform_device),
context_(context) {
CHECK(platform_device) << "platform_device cannot be NULL";
libusb_ref_device(platform_device);
ReadAllConfigurations();
RefreshActiveConfiguration();
}
UsbDeviceImpl::~UsbDeviceImpl() {
// The destructor must be safe to call from any thread.
libusb_unref_device(platform_device_);
}
void UsbDeviceImpl::Open(const OpenCallback& callback) {
DCHECK(thread_checker_.CalledOnValidThread());
scoped_refptr<base::SequencedTaskRunner> blocking_task_runner =
UsbService::CreateBlockingTaskRunner();
blocking_task_runner->PostTask(
FROM_HERE,
base::Bind(&UsbDeviceImpl::OpenOnBlockingThread, this, callback,
base::ThreadTaskRunnerHandle::Get(), blocking_task_runner));
}
void UsbDeviceImpl::ReadAllConfigurations() {
libusb_device_descriptor device_descriptor;
int rv = libusb_get_device_descriptor(platform_device_, &device_descriptor);
if (rv == LIBUSB_SUCCESS) {
for (uint8_t i = 0; i < device_descriptor.bNumConfigurations; ++i) {
unsigned char* buffer;
rv = libusb_get_raw_config_descriptor(platform_device_, i, &buffer);
if (rv < 0) {
USB_LOG(EVENT) << "Failed to get config descriptor: "
<< ConvertPlatformUsbErrorToString(rv);
continue;
}
if (!descriptor_.Parse(std::vector<uint8_t>(buffer, buffer + rv)))
USB_LOG(EVENT) << "Config descriptor index " << i << " was corrupt.";
free(buffer);
}
} else {
USB_LOG(EVENT) << "Failed to get device descriptor: "
<< ConvertPlatformUsbErrorToString(rv);
}
}
void UsbDeviceImpl::RefreshActiveConfiguration() {
uint8_t config_value;
int rv = libusb_get_active_config_value(platform_device_, &config_value);
if (rv != LIBUSB_SUCCESS) {
USB_LOG(EVENT) << "Failed to get active configuration: "
<< ConvertPlatformUsbErrorToString(rv);
return;
}
ActiveConfigurationChanged(config_value);
}
void UsbDeviceImpl::OpenOnBlockingThread(
const OpenCallback& callback,
scoped_refptr<base::TaskRunner> task_runner,
scoped_refptr<base::SequencedTaskRunner> blocking_task_runner) {
base::ThreadRestrictions::AssertIOAllowed();
PlatformUsbDeviceHandle handle;
const int rv = libusb_open(platform_device_, &handle);
if (LIBUSB_SUCCESS == rv) {
task_runner->PostTask(
FROM_HERE, base::Bind(&UsbDeviceImpl::Opened, this, handle, callback,
blocking_task_runner));
} else {
USB_LOG(EVENT) << "Failed to open device: "
<< ConvertPlatformUsbErrorToString(rv);
task_runner->PostTask(FROM_HERE, base::Bind(callback, nullptr));
}
}
void UsbDeviceImpl::Opened(
PlatformUsbDeviceHandle platform_handle,
const OpenCallback& callback,
scoped_refptr<base::SequencedTaskRunner> blocking_task_runner) {
DCHECK(thread_checker_.CalledOnValidThread());
scoped_refptr<UsbDeviceHandle> device_handle = new UsbDeviceHandleImpl(
context_, this, platform_handle, blocking_task_runner);
handles().push_back(device_handle.get());
callback.Run(device_handle);
}
} // namespace device
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