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/*
* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice, this
* list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#pragma once
#include <Kernel/Devices/CharacterDevice.h>
#include <Kernel/Interrupts/IRQHandler.h>
#include <Kernel/VM/PhysicalPage.h>
#include <Kernel/WaitQueue.h>
#include <LibBareMetal/Memory/PhysicalAddress.h>
namespace Kernel {
class SB16;
class SB16 final : public IRQHandler
, public CharacterDevice {
public:
SB16();
virtual ~SB16() override;
static SB16& the();
// ^CharacterDevice
virtual bool can_read(const FileDescription&) const override;
virtual ssize_t read(FileDescription&, u8*, ssize_t) override;
virtual ssize_t write(FileDescription&, const u8*, ssize_t) override;
virtual bool can_write(const FileDescription&) const override { return true; }
virtual const char* purpose() const override { return class_name(); }
private:
// ^IRQHandler
virtual void handle_irq(const RegisterState&) override;
// ^CharacterDevice
virtual const char* class_name() const override { return "SB16"; }
void initialize();
void wait_for_irq();
void dma_start(uint32_t length);
void set_sample_rate(uint16_t hz);
void dsp_write(u8 value);
u8 dsp_read();
u8 get_irq_line();
void set_irq_register(u8 irq_number);
void set_irq_line(u8 irq_number);
OwnPtr<Region> m_dma_region;
int m_major_version { 0 };
WaitQueue m_irq_queue;
};
}
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