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/*
* Copyright (c) 2021, Jesse Buhagiar <jooster669@gmail.com>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <Kernel/Bus/USB/USBTransfer.h>
#include <Kernel/Library/StdLib.h>
#include <Kernel/Memory/MemoryManager.h>
namespace Kernel::USB {
ErrorOr<NonnullLockRefPtr<Transfer>> Transfer::create(Pipe& pipe, u16 length, Memory::Region& dma_buffer, USBAsyncCallback callback)
{
return adopt_nonnull_lock_ref_or_enomem(new (nothrow) Transfer(pipe, length, dma_buffer, move(callback)));
}
Transfer::Transfer(Pipe& pipe, u16 len, Memory::Region& dma_buffer, USBAsyncCallback callback)
: m_pipe(pipe)
, m_dma_buffer(dma_buffer)
, m_transfer_data_size(len)
, m_callback(move(callback))
{
}
Transfer::~Transfer() = default;
void Transfer::set_setup_packet(USBRequestData const& request)
{
// Kind of a nasty hack... Because the kernel isn't in the business
// of handing out physical pointers that we can directly write to,
// we set the address of the setup packet to be the first 8 bytes of
// the data buffer, which we then set to the physical address.
auto* request_data = reinterpret_cast<USBRequestData*>(buffer().as_ptr());
request_data->request_type = request.request_type;
request_data->request = request.request;
request_data->value = request.value;
request_data->index = request.index;
request_data->length = request.length;
m_request = request;
}
ErrorOr<void> Transfer::write_buffer(u16 len, void* data)
{
VERIFY(len <= m_dma_buffer.size());
m_transfer_data_size = len;
memcpy(buffer().as_ptr(), data, len);
return {};
}
void Transfer::invoke_async_callback()
{
if (m_callback)
m_callback(this);
}
}
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