mirror of
https://github.com/LadybirdBrowser/ladybird.git
synced 2024-11-11 01:06:01 +03:00
d0ceaa24a6
Two new ioctl requests are used to get and set the sample rate of the sound card. The SB16 device keeps track of the sample rate separately, because I don't want to figure out how to read the sample rate from the device; it's easier that way. The soundcard write doesn't set the sample rate to 44100 Hz every time anymore, as we want to change it externally.
67 lines
1.8 KiB
C++
67 lines
1.8 KiB
C++
/*
|
|
* 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 {
|
|
public:
|
|
SB16();
|
|
virtual ~SB16() override;
|
|
|
|
static void detect();
|
|
static void create();
|
|
static SB16& the();
|
|
|
|
// ^CharacterDevice
|
|
virtual bool can_read(const FileDescription&, size_t) const override;
|
|
virtual KResultOr<size_t> read(FileDescription&, u64, UserOrKernelBuffer&, size_t) override;
|
|
virtual KResultOr<size_t> write(FileDescription&, u64, const UserOrKernelBuffer&, size_t) override;
|
|
virtual bool can_write(const FileDescription&, size_t) const override { return true; }
|
|
|
|
virtual StringView purpose() const override { return class_name(); }
|
|
|
|
// ^Device
|
|
virtual mode_t required_mode() const override { return 0220; }
|
|
virtual String device_name() const override { return "audio"; }
|
|
|
|
virtual KResult ioctl(FileDescription&, unsigned, Userspace<void*>) override;
|
|
|
|
private:
|
|
// ^IRQHandler
|
|
virtual bool handle_irq(const RegisterState&) override;
|
|
|
|
// ^CharacterDevice
|
|
virtual StringView 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);
|
|
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;
|
|
};
|
|
}
|