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/*
* Copyright (C) 2017 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include "guest/commands/usbforward/transport_request.h"
#include <log/log.h>
namespace usb_forward {
TransportRequest::TransportRequest(std::shared_ptr<libusb_device_handle> handle,
CallbackType callback,
const ControlTransfer& transfer)
: handle_{std::move(handle)},
callback_{std::move(callback)},
is_control_{true},
transfer_{libusb_alloc_transfer(0), libusb_free_transfer} {
// NOTE: libusb places setup structure as part of user data!
buffer_.reset(new uint8_t[transfer.length + LIBUSB_CONTROL_SETUP_SIZE]);
// NOTE: libusb places a structure of size LIBUSB_CONTROL_SETUP_SIZE directly
// in the data buffer.
libusb_fill_control_setup(buffer_.get(), transfer.type, transfer.cmd,
transfer.value, transfer.index, transfer.length);
// NOTE: despite libusb requires user to allocate buffer large enough to
// accommodate SETUP structure and actual data, it requires user to provide
// only data length here, while setup length is added internally.
libusb_fill_control_transfer(transfer_.get(), handle_.get(), buffer_.get(),
OnTransferComplete, this, transfer.timeout);
}
TransportRequest::TransportRequest(std::shared_ptr<libusb_device_handle> handle,
CallbackType callback,
const DataTransfer& transfer)
: handle_{std::move(handle)},
callback_{std::move(callback)},
is_control_{false},
transfer_{libusb_alloc_transfer(0), libusb_free_transfer} {
buffer_.reset(new uint8_t[transfer.length]);
libusb_fill_bulk_transfer(
transfer_.get(), handle_.get(),
transfer.endpoint_id | (transfer.is_host_to_device ? LIBUSB_ENDPOINT_OUT
: LIBUSB_ENDPOINT_IN),
buffer_.get(), transfer.length, OnTransferComplete, this,
transfer.timeout);
}
uint8_t* TransportRequest::Buffer() {
if (is_control_) {
return &buffer_[LIBUSB_CONTROL_SETUP_SIZE];
} else {
return buffer_.get();
}
}
bool TransportRequest::Submit() {
if (handle_) {
auto err = libusb_submit_transfer(transfer_.get());
if (err != 0) {
ALOGE("libusb transfer failed: %d", err);
}
return err == 0;
} else {
ALOGE("Initiated transfer, but device not opened.");
return false;
}
}
void TransportRequest::OnTransferComplete(libusb_transfer* req) {
auto treq = static_cast<TransportRequest*>(req->user_data);
treq->callback_(req->status == 0, treq->Buffer(), req->actual_length);
}
} // namespace usb_forward
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