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74 lines
2.5 KiB
C++
74 lines
2.5 KiB
C++
/*
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* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice, this
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* list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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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/IRQHandler.h>
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#include <Kernel/VM/PhysicalPage.h>
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#include <Kernel/WaitQueue.h>
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#include <LibBareMetal/Memory/PhysicalAddress.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 SB16& the();
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// ^CharacterDevice
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virtual bool can_read(const FileDescription&) const override;
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virtual ssize_t read(FileDescription&, u8*, ssize_t) override;
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virtual ssize_t write(FileDescription&, const u8*, ssize_t) override;
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virtual bool can_write(const FileDescription&) const override { return true; }
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private:
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// ^IRQHandler
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virtual void handle_irq() override;
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// ^CharacterDevice
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virtual const char* 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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u8 dsp_read();
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OwnPtr<Region> m_dma_region;
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int m_major_version { 0 };
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WaitQueue m_irq_queue;
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};
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}
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