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/*
* Copyright (c) 2021, Jesse Buhagiar <jooster669@gmail.com>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#pragma once
#include <AK/AtomicRefCounted.h>
#include <AK/OwnPtr.h>
#include <Kernel/Bus/USB/PacketTypes.h>
#include <Kernel/Bus/USB/USBPipe.h>
#include <Kernel/Library/LockRefPtr.h>
#include <Kernel/Memory/AnonymousVMObject.h>
#include <Kernel/Memory/PhysicalPage.h>
#include <Kernel/Memory/Region.h>
// TODO: Callback stuff in this class please!
namespace Kernel::USB {
class Transfer final : public AtomicRefCounted<Transfer> {
public:
static ErrorOr<NonnullLockRefPtr<Transfer>> create(Pipe&, u16 length, Memory::Region& dma_buffer, USBAsyncCallback callback = nullptr);
Transfer() = delete;
~Transfer();
void set_setup_packet(USBRequestData const& request);
void set_complete() { m_complete = true; }
void set_error_occurred() { m_error_occurred = true; }
ErrorOr<void> write_buffer(u16 len, void* data);
// `const` here makes sure we don't blow up by writing to a physical address
USBRequestData const& request() const { return m_request; }
Pipe const& pipe() const { return m_pipe; }
Pipe& pipe() { return m_pipe; }
VirtualAddress buffer() const { return m_dma_buffer.vaddr(); }
PhysicalAddress buffer_physical() const { return m_dma_buffer.physical_page(0)->paddr(); }
u16 transfer_data_size() const { return m_transfer_data_size; }
bool complete() const { return m_complete; }
bool error_occurred() const { return m_error_occurred; }
void invoke_async_callback();
private:
Transfer(Pipe& pipe, u16 len, Memory::Region& dma_buffer, USBAsyncCallback callback);
Pipe& m_pipe; // Pipe that initiated this transfer
Memory::Region& m_dma_buffer; // DMA buffer
USBRequestData m_request; // USB request
u16 m_transfer_data_size { 0 }; // Size of the transfer's data stage
bool m_complete { false }; // Has this transfer been completed?
bool m_error_occurred { false }; // Did an error occur during this transfer?
USBAsyncCallback m_callback { nullptr };
};
}
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