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21b6d84ff0
These methods are no longer needed because SystemServer is able to populate the DevFS on its own. Device absolute_path no longer assume a path to the /dev location, because it really should not assume any path to a Device node. Because StorageManagement still needs to know the storage name, we declare a virtual method only for StorageDevices to override, but this technique should really be removed later on.
62 lines
1.7 KiB
C++
62 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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public:
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SB16();
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virtual ~SB16() override;
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static void detect();
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static void create();
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static SB16& the();
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// ^CharacterDevice
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virtual bool can_read(const OpenFileDescription&, size_t) const override;
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virtual KResultOr<size_t> read(OpenFileDescription&, u64, UserOrKernelBuffer&, size_t) override;
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virtual KResultOr<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 KResult ioctl(OpenFileDescription&, unsigned, Userspace<void*>) override;
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private:
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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"; }
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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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