mirror of
https://github.com/RGBCube/serenity
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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. :^)
63 lines
1.7 KiB
C++
63 lines
1.7 KiB
C++
/*
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* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#pragma once
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#include <Kernel/Devices/CharacterDevice.h>
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#include <Kernel/Interrupts/IRQHandler.h>
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#include <Kernel/Memory/PhysicalPage.h>
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#include <Kernel/PhysicalAddress.h>
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#include <Kernel/WaitQueue.h>
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namespace Kernel {
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class SB16;
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class SB16 final : public IRQHandler
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, public CharacterDevice {
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friend class DeviceManagement;
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public:
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virtual ~SB16() override;
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static RefPtr<SB16> try_detect_and_create();
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// ^CharacterDevice
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virtual bool can_read(const OpenFileDescription&, size_t) const override;
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virtual ErrorOr<size_t> read(OpenFileDescription&, u64, UserOrKernelBuffer&, size_t) override;
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virtual ErrorOr<size_t> write(OpenFileDescription&, u64, const UserOrKernelBuffer&, size_t) override;
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virtual bool can_write(const OpenFileDescription&, size_t) const override { return true; }
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virtual StringView purpose() const override { return class_name(); }
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virtual ErrorOr<void> ioctl(OpenFileDescription&, unsigned, Userspace<void*>) override;
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private:
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SB16();
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// ^IRQHandler
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virtual bool handle_irq(const RegisterState&) override;
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// ^CharacterDevice
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virtual StringView class_name() const override { return "SB16"sv; }
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void initialize();
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void wait_for_irq();
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void dma_start(uint32_t length);
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void set_sample_rate(uint16_t hz);
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void dsp_write(u8 value);
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static u8 dsp_read();
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u8 get_irq_line();
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void set_irq_register(u8 irq_number);
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void set_irq_line(u8 irq_number);
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OwnPtr<Memory::Region> m_dma_region;
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int m_major_version { 0 };
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u16 m_sample_rate { 44100 };
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WaitQueue m_irq_queue;
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};
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}
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