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