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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_device.h"
#include "base/stl_util.h"
#include "base/synchronization/lock.h"
#include "chrome/browser/usb/usb_service.h"
#include "third_party/libusb/libusb.h"
namespace {
static uint8 ConvertTransferDirection(
const UsbDevice::TransferDirection direction) {
switch (direction) {
case UsbDevice::INBOUND:
return LIBUSB_ENDPOINT_IN;
case UsbDevice::OUTBOUND:
return LIBUSB_ENDPOINT_OUT;
}
NOTREACHED();
return LIBUSB_ENDPOINT_OUT;
}
static uint8 CreateRequestType(const UsbDevice::TransferDirection direction,
const UsbDevice::TransferRequestType request_type,
const UsbDevice::TransferRecipient recipient) {
uint8 result = ConvertTransferDirection(direction);
switch (request_type) {
case UsbDevice::STANDARD:
result |= LIBUSB_REQUEST_TYPE_STANDARD;
break;
case UsbDevice::CLASS:
result |= LIBUSB_REQUEST_TYPE_CLASS;
break;
case UsbDevice::VENDOR:
result |= LIBUSB_REQUEST_TYPE_VENDOR;
break;
case UsbDevice::RESERVED:
result |= LIBUSB_REQUEST_TYPE_RESERVED;
break;
}
switch (recipient) {
case UsbDevice::DEVICE:
result |= LIBUSB_RECIPIENT_DEVICE;
break;
case UsbDevice::INTERFACE:
result |= LIBUSB_RECIPIENT_INTERFACE;
break;
case UsbDevice::ENDPOINT:
result |= LIBUSB_RECIPIENT_ENDPOINT;
break;
case UsbDevice::OTHER:
result |= LIBUSB_RECIPIENT_OTHER;
break;
}
return result;
}
static void HandleTransferCompletion(struct libusb_transfer* transfer) {
UsbDevice* const device = reinterpret_cast<UsbDevice*>(transfer->user_data);
device->TransferComplete(transfer);
}
} // namespace
UsbDevice::Transfer::Transfer() {}
UsbDevice::Transfer::~Transfer() {}
UsbDevice::UsbDevice(UsbService* service, PlatformUsbDeviceHandle handle)
: service_(service), handle_(handle) {
DCHECK(handle) << "Cannot create device with NULL handle.";
}
UsbDevice::~UsbDevice() {}
void UsbDevice::Close() {
CheckDevice();
service_->CloseDevice(this);
handle_ = NULL;
}
void UsbDevice::TransferComplete(PlatformUsbTransferHandle handle) {
base::AutoLock lock(lock_);
DCHECK(ContainsKey(transfers_, handle)) << "Missing transfer completed";
Transfer* const transfer = &transfers_[handle];
if (transfer->buffer.get()) {
transfer->callback.Run(handle->status != LIBUSB_TRANSFER_COMPLETED);
}
transfers_.erase(handle);
libusb_free_transfer(handle);
}
void UsbDevice::ControlTransfer(const TransferDirection direction,
const TransferRequestType request_type, const TransferRecipient recipient,
const uint8 request, const uint16 value, const uint16 index,
net::IOBuffer* buffer, const size_t length, const unsigned int timeout,
const net::CompletionCallback& callback) {
CheckDevice();
struct libusb_transfer* const transfer = libusb_alloc_transfer(0);
const uint8 converted_type = CreateRequestType(direction, request_type,
recipient);
libusb_fill_control_setup(reinterpret_cast<uint8*>(buffer->data()),
converted_type, request, value, index, length);
libusb_fill_control_transfer(transfer, handle_, reinterpret_cast<uint8*>(
buffer->data()), reinterpret_cast<libusb_transfer_cb_fn>(
&HandleTransferCompletion), this, timeout);
AddTransfer(transfer, buffer, callback);
libusb_submit_transfer(transfer);
}
void UsbDevice::BulkTransfer(const TransferDirection direction,
const uint8 endpoint, net::IOBuffer* buffer, const size_t length,
const unsigned int timeout, const net::CompletionCallback& callback) {
CheckDevice();
struct libusb_transfer* const transfer = libusb_alloc_transfer(0);
const uint8 new_endpoint = ConvertTransferDirection(direction) | endpoint;
libusb_fill_bulk_transfer(transfer, handle_, new_endpoint,
reinterpret_cast<uint8*>(buffer->data()), length,
reinterpret_cast<libusb_transfer_cb_fn>(&HandleTransferCompletion), this,
timeout);
AddTransfer(transfer, buffer, callback);
libusb_submit_transfer(transfer);
}
void UsbDevice::InterruptTransfer(const TransferDirection direction,
const uint8 endpoint, net::IOBuffer* buffer, const size_t length,
const unsigned int timeout, const net::CompletionCallback& callback) {
CheckDevice();
struct libusb_transfer* const transfer = libusb_alloc_transfer(0);
const uint8 new_endpoint = ConvertTransferDirection(direction) | endpoint;
libusb_fill_interrupt_transfer(transfer, handle_, new_endpoint,
reinterpret_cast<uint8*>(buffer->data()), length,
reinterpret_cast<libusb_transfer_cb_fn>(&HandleTransferCompletion), this,
timeout);
AddTransfer(transfer, buffer, callback);
libusb_submit_transfer(transfer);
}
void UsbDevice::CheckDevice() {
DCHECK(handle_) << "Device is already closed.";
}
void UsbDevice::AddTransfer(PlatformUsbTransferHandle handle,
net::IOBuffer* buffer,
const net::CompletionCallback& callback) {
Transfer transfer;
transfer.buffer = buffer;
transfer.callback = callback;
{
base::AutoLock lock(lock_);
transfers_[handle] = transfer;
}
}
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