mirror of
https://github.com/RGBCube/serenity
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0c64abb5e3
Splitting the I2C-related code lets the DisplayConnector code to utilize I2C operations without caring about the specific details of the hardware and allow future expansion of the driver to other newer generations sharing the same GMBus code. We should require a timeout for GMBus operations always, because faulty hardware could let us just spin forever. Also, if nothing is listening to the bus (which should result in a NAK), we could also spin forever.
53 lines
1.2 KiB
C++
53 lines
1.2 KiB
C++
/*
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* Copyright (c) 2022, Liav A. <liavalb@hotmail.co.il>
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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 <AK/RefPtr.h>
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#include <AK/Try.h>
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#include <AK/Types.h>
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#include <Kernel/Locking/Spinlock.h>
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#include <Kernel/Memory/TypedMapping.h>
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namespace Kernel {
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struct [[gnu::packed]] GMBusRegisters {
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u32 clock;
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u32 command;
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u32 status;
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u32 data;
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};
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enum class GMBusStatus;
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class GMBusConnector {
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public:
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enum PinPair : u8 {
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None = 0,
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DedicatedControl = 1,
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DedicatedAnalog = 0b10,
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IntegratedDigital = 0b11,
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sDVO = 0b101,
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Dconnector = 0b111,
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};
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public:
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static ErrorOr<NonnullOwnPtr<GMBusConnector>> create_with_physical_address(PhysicalAddress gmbus_start_address);
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ErrorOr<void> write(unsigned address, u32 data);
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ErrorOr<void> read(unsigned address, u8* buf, size_t length);
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void set_default_rate();
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private:
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void set_pin_pair(PinPair pin_pair);
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bool wait_for(GMBusStatus desired_status, size_t milliseconds_timeout);
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explicit GMBusConnector(Memory::TypedMapping<GMBusRegisters volatile>);
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Spinlock<LockRank::None> m_access_lock;
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Memory::TypedMapping<GMBusRegisters volatile> m_gmbus_registers;
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};
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}
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