mirror of
https://github.com/SerenityOS/serenity
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71 lines
2 KiB
C++
71 lines
2 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/Library/StdLib.h>
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#include <Kernel/Library/UserOrKernelBuffer.h>
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#include <Kernel/Memory/MemoryManager.h>
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namespace Kernel::USB {
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ErrorOr<NonnullLockRefPtr<Transfer>> Transfer::create(Pipe& pipe, u16 length, Memory::Region& dma_buffer, USBAsyncCallback callback)
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{
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return adopt_nonnull_lock_ref_or_enomem(new (nothrow) Transfer(pipe, length, dma_buffer, move(callback)));
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}
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Transfer::Transfer(Pipe& pipe, u16 len, Memory::Region& dma_buffer, USBAsyncCallback callback)
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: m_pipe(pipe)
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, m_dma_buffer(dma_buffer)
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, m_transfer_data_size(len)
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, m_callback(move(callback))
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{
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}
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Transfer::~Transfer() = default;
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void Transfer::set_setup_packet(USBRequestData const& 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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ErrorOr<void> Transfer::write_buffer(u16 len, void* data)
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{
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VERIFY(len <= m_dma_buffer.size());
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m_transfer_data_size = len;
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memcpy(buffer().as_ptr(), data, len);
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return {};
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}
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ErrorOr<void> Transfer::write_buffer(u16 len, UserOrKernelBuffer data)
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{
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VERIFY(len <= m_dma_buffer.size());
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m_transfer_data_size = len;
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return data.read(buffer().as_ptr(), len);
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}
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void Transfer::invoke_async_callback()
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{
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if (transfer_data_size() == 0)
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return;
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if (m_callback)
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m_callback(this);
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}
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}
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