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79fa9765ca
We now use AK::Error and AK::ErrorOr<T> in both kernel and userspace! This was a slightly tedious refactoring that took a long time, so it's not unlikely that some bugs crept in. Nevertheless, it does pass basic functionality testing, and it's just real nice to finally see the same pattern in all contexts. :^)
49 lines
1.5 KiB
C++
49 lines
1.5 KiB
C++
/*
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* Copyright (c) 2021, Jesse Buhagiar <jooster669@gmail.com>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <Kernel/Bus/USB/USBTransfer.h>
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#include <Kernel/Memory/MemoryManager.h>
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namespace Kernel::USB {
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ErrorOr<NonnullRefPtr<Transfer>> Transfer::try_create(Pipe& pipe, u16 length)
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{
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// Initialize data buffer for transfer
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// This will definitely need to be refactored in the future, I doubt this will scale well...
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auto region = TRY(MM.allocate_kernel_region(PAGE_SIZE, "USB Transfer Buffer", Memory::Region::Access::ReadWrite));
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return adopt_nonnull_ref_or_enomem(new (nothrow) Transfer(pipe, length, move(region)));
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}
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Transfer::Transfer(Pipe& pipe, u16 len, NonnullOwnPtr<Memory::Region> data_buffer)
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: m_pipe(pipe)
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, m_data_buffer(move(data_buffer))
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, m_transfer_data_size(len)
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{
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}
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Transfer::~Transfer()
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{
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}
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void Transfer::set_setup_packet(const USBRequestData& request)
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{
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// Kind of a nasty hack... Because the kernel isn't in the business
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// of handing out physical pointers that we can directly write to,
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// we set the address of the setup packet to be the first 8 bytes of
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// the data buffer, which we then set to the physical address.
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auto* request_data = reinterpret_cast<USBRequestData*>(buffer().as_ptr());
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request_data->request_type = request.request_type;
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request_data->request = request.request;
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request_data->value = request.value;
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request_data->index = request.index;
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request_data->length = request.length;
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m_request = request;
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}
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}
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