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Kernel/USB: Add support for async & interrupt transfers
Add support for async transfers by using a separate kernel task to poll a list of active async transfers on a set time interval, and invoke their user-provided callback function when they are complete. Also add support for the interrupt class of transfers, building off of this async functionality.
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8 changed files with 181 additions and 62 deletions
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@ -20,7 +20,7 @@ namespace Kernel::USB {
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class Transfer final : public AtomicRefCounted<Transfer> {
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public:
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static ErrorOr<NonnullLockRefPtr<Transfer>> try_create(Pipe&, u16 length, Memory::Region& dma_buffer);
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static ErrorOr<NonnullLockRefPtr<Transfer>> create(Pipe&, u16 length, Memory::Region& dma_buffer, USBAsyncCallback callback = nullptr);
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Transfer() = delete;
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~Transfer();
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@ -41,14 +41,17 @@ public:
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bool complete() const { return m_complete; }
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bool error_occurred() const { return m_error_occurred; }
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void invoke_async_callback();
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private:
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Transfer(Pipe& pipe, u16 len, Memory::Region& dma_buffer);
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Transfer(Pipe& pipe, u16 len, Memory::Region& dma_buffer, USBAsyncCallback callback);
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Pipe& m_pipe; // Pipe that initiated this transfer
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Memory::Region& m_dma_buffer; // DMA buffer
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USBRequestData m_request; // USB request
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u16 m_transfer_data_size { 0 }; // Size of the transfer's data stage
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bool m_complete { false }; // Has this transfer been completed?
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bool m_error_occurred { false }; // Did an error occur during this transfer?
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USBAsyncCallback m_callback { nullptr };
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};
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}
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