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Kernel: Enumify all magic constants for I8042 devices
This makes the code much easier to read.
This commit is contained in:
Jelle Raaijmakers
Andreas Kling
parent
0a748de1a0
commit
26c84967fa
Notes:
sideshowbarker
2024-07-18 01:56:12 +09:00
Author: https://github.com/gmta Commit: https://github.com/SerenityOS/serenity/commit/26c84967faa Pull-request: https://github.com/SerenityOS/serenity/pull/10627 Issue: https://github.com/SerenityOS/serenity/issues/5881
4 changed files with 115 additions and 82 deletions
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@ -37,51 +37,51 @@ UNMAP_AFTER_INIT void I8042Controller::detect_devices()
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{
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SpinlockLocker lock(m_lock);
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// Disable devices
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do_wait_then_write(I8042_STATUS, 0xad);
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do_wait_then_write(I8042_STATUS, 0xa7); // ignored if it doesn't exist
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do_wait_then_write(I8042Port::Command, I8042Command::DisableFirstPS2Port);
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do_wait_then_write(I8042Port::Command, I8042Command::DisableSecondPS2Port); // ignored if it doesn't exist
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// Drain buffers
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do_drain();
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do_wait_then_write(I8042_STATUS, 0x20);
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configuration = do_wait_then_read(I8042_BUFFER);
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do_wait_then_write(I8042_STATUS, 0x60);
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configuration &= ~3; // Disable IRQs for all
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do_wait_then_write(I8042_BUFFER, configuration);
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do_wait_then_write(I8042Port::Command, I8042Command::ReadConfiguration);
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configuration = do_wait_then_read(I8042Port::Buffer);
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do_wait_then_write(I8042Port::Command, I8042Command::WriteConfiguration);
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configuration &= ~I8042ConfigurationFlag::FirstPS2PortInterrupt;
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configuration &= ~I8042ConfigurationFlag::SecondPS2PortInterrupt;
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do_wait_then_write(I8042Port::Buffer, configuration);
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m_is_dual_channel = (configuration & (1 << 5)) != 0;
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dbgln("I8042: {} channel controller",
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m_is_dual_channel ? "Dual" : "Single");
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m_is_dual_channel = (configuration & I8042ConfigurationFlag::SecondPS2PortClock) != 0;
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dbgln("I8042: {} channel controller", m_is_dual_channel ? "Dual" : "Single");
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// Perform controller self-test
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do_wait_then_write(I8042_STATUS, 0xaa);
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if (do_wait_then_read(I8042_BUFFER) == 0x55) {
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do_wait_then_write(I8042Port::Command, I8042Command::TestPS2Controller);
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if (do_wait_then_read(I8042Port::Buffer) == I8042Response::ControllerTestPassed) {
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// Restore configuration in case the controller reset
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do_wait_then_write(I8042_STATUS, 0x60);
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do_wait_then_write(I8042_BUFFER, configuration);
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do_wait_then_write(I8042Port::Command, I8042Command::WriteConfiguration);
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do_wait_then_write(I8042Port::Buffer, configuration);
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} else {
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dbgln("I8042: Controller self test failed");
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}
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// Test ports and enable them if available
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do_wait_then_write(I8042_STATUS, 0xab); // test
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m_first_port_available = (do_wait_then_read(I8042_BUFFER) == 0);
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do_wait_then_write(I8042Port::Command, I8042Command::TestFirstPS2Port);
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m_first_port_available = (do_wait_then_read(I8042Port::Buffer) == 0);
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if (m_first_port_available) {
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do_wait_then_write(I8042_STATUS, 0xae); //enable
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configuration |= 1;
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configuration &= ~(1 << 4);
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do_wait_then_write(I8042Port::Command, I8042Command::EnableFirstPS2Port);
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configuration |= I8042ConfigurationFlag::FirstPS2PortInterrupt;
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configuration &= ~I8042ConfigurationFlag::FirstPS2PortClock;
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} else {
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dbgln("I8042: Keyboard port not available");
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}
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if (m_is_dual_channel) {
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do_wait_then_write(I8042_STATUS, 0xa9); // test
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m_second_port_available = (do_wait_then_read(I8042_BUFFER) == 0);
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do_wait_then_write(I8042Port::Command, I8042Command::TestSecondPS2Port);
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m_second_port_available = (do_wait_then_read(I8042Port::Buffer) == 0);
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if (m_second_port_available) {
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do_wait_then_write(I8042_STATUS, 0xa8); // enable
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configuration |= 2;
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configuration &= ~(1 << 5);
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do_wait_then_write(I8042Port::Command, I8042Command::EnableSecondPS2Port);
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configuration |= I8042ConfigurationFlag::SecondPS2PortInterrupt;
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configuration &= ~I8042ConfigurationFlag::SecondPS2PortClock;
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} else {
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dbgln("I8042: Mouse port not available");
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}
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@ -89,9 +89,10 @@ UNMAP_AFTER_INIT void I8042Controller::detect_devices()
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// Enable IRQs for the ports that are usable
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if (m_first_port_available || m_second_port_available) {
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configuration &= ~0x30; // renable clocks
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do_wait_then_write(I8042_STATUS, 0x60);
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do_wait_then_write(I8042_BUFFER, configuration);
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configuration &= ~I8042ConfigurationFlag::FirstPS2PortClock;
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configuration &= ~I8042ConfigurationFlag::SecondPS2PortClock;
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do_wait_then_write(I8042Port::Command, I8042Command::WriteConfiguration);
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do_wait_then_write(I8042Port::Buffer, configuration);
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}
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}
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@ -101,11 +102,11 @@ UNMAP_AFTER_INIT void I8042Controller::detect_devices()
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if (!m_keyboard_device) {
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dbgln("I8042: Keyboard device failed to initialize, disable");
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m_first_port_available = false;
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configuration &= ~1;
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configuration |= 1 << 4;
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configuration &= ~I8042ConfigurationFlag::FirstPS2PortInterrupt;
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configuration |= I8042ConfigurationFlag::FirstPS2PortClock;
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SpinlockLocker lock(m_lock);
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do_wait_then_write(I8042_STATUS, 0x60);
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do_wait_then_write(I8042_BUFFER, configuration);
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do_wait_then_write(I8042Port::Command, I8042Command::WriteConfiguration);
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do_wait_then_write(I8042Port::Buffer, configuration);
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}
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}
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if (m_second_port_available) {
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@ -115,10 +116,10 @@ UNMAP_AFTER_INIT void I8042Controller::detect_devices()
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if (!m_mouse_device) {
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dbgln("I8042: Mouse device failed to initialize, disable");
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m_second_port_available = false;
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configuration |= 1 << 5;
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configuration |= I8042ConfigurationFlag::SecondPS2PortClock;
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SpinlockLocker lock(m_lock);
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do_wait_then_write(I8042_STATUS, 0x60);
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do_wait_then_write(I8042_BUFFER, configuration);
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do_wait_then_write(I8042Port::Command, I8042Command::WriteConfiguration);
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do_wait_then_write(I8042Port::Buffer, configuration);
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}
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}
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}
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@ -134,11 +135,11 @@ bool I8042Controller::irq_process_input_buffer(HIDDevice::Type)
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{
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VERIFY(Processor::current_in_irq());
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u8 status = IO::in8(I8042_STATUS);
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if (!(status & I8042_BUFFER_FULL))
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u8 status = IO::in8(I8042Port::Status);
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if (!(status & I8042StatusFlag::OutputBuffer))
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return false;
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HIDDevice::Type data_for_device = ((status & I8042_WHICH_BUFFER) == I8042_MOUSE_BUFFER) ? HIDDevice::Type::Mouse : HIDDevice::Type::Keyboard;
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u8 byte = IO::in8(I8042_BUFFER);
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HIDDevice::Type data_for_device = ((status & I8042StatusFlag::SecondPS2PortOutputBuffer) == 0) ? HIDDevice::Type::Keyboard : HIDDevice::Type::Mouse;
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u8 byte = IO::in8(I8042Port::Buffer);
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if (data_for_device == HIDDevice::Type::Mouse) {
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VERIFY(m_mouse_device);
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static_cast<PS2MouseDevice&>(*m_mouse_device).irq_handle_byte_read(byte);
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@ -155,10 +156,10 @@ bool I8042Controller::irq_process_input_buffer(HIDDevice::Type)
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void I8042Controller::do_drain()
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{
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for (;;) {
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u8 status = IO::in8(I8042_STATUS);
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if (!(status & I8042_BUFFER_FULL))
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u8 status = IO::in8(I8042Port::Status);
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if (!(status & I8042StatusFlag::OutputBuffer))
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return;
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IO::in8(I8042_BUFFER);
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IO::in8(I8042Port::Buffer);
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}
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}
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@ -168,10 +169,10 @@ bool I8042Controller::do_reset_device(HIDDevice::Type device)
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VERIFY(m_lock.is_locked());
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VERIFY(!Processor::current_in_irq());
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if (do_send_command(device, 0xff) != I8042_ACK)
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if (do_send_command(device, I8042Command::Reset) != I8042Response::Acknowledge)
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return false;
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// Wait until we get the self-test result
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return do_wait_then_read(I8042_BUFFER) == 0xaa;
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return do_wait_then_read(I8042Port::Buffer) == I8042Response::Success;
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}
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u8 I8042Controller::do_send_command(HIDDevice::Type device, u8 command)
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@ -192,7 +193,7 @@ u8 I8042Controller::do_send_command(HIDDevice::Type device, u8 command, u8 data)
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VERIFY(!Processor::current_in_irq());
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u8 response = do_write_to_device(device, command);
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if (response == I8042_ACK)
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if (response == I8042Response::Acknowledge)
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response = do_write_to_device(device, data);
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return response;
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}
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@ -209,13 +210,13 @@ u8 I8042Controller::do_write_to_device(HIDDevice::Type device, u8 data)
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do {
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if (device != HIDDevice::Type::Keyboard) {
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prepare_for_output();
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IO::out8(I8042_STATUS, 0xd4);
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IO::out8(I8042Port::Command, I8042Command::WriteSecondPS2PortInputBuffer);
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}
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prepare_for_output();
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IO::out8(I8042_BUFFER, data);
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IO::out8(I8042Port::Buffer, data);
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response = do_wait_then_read(I8042_BUFFER);
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} while (response == I8042_RESEND && ++attempts < 3);
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response = do_wait_then_read(I8042Port::Buffer);
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} while (response == I8042Response::Resend && ++attempts < 3);
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if (attempts >= 3)
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dbgln("Failed to write byte to device, gave up");
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return response;
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@ -226,16 +227,20 @@ u8 I8042Controller::do_read_from_device(HIDDevice::Type device)
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VERIFY(device != HIDDevice::Type::Unknown);
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prepare_for_input(device);
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return IO::in8(I8042_BUFFER);
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return IO::in8(I8042Port::Buffer);
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}
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void I8042Controller::prepare_for_input(HIDDevice::Type device)
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{
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VERIFY(m_lock.is_locked());
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const u8 buffer_type = device == HIDDevice::Type::Keyboard ? I8042_KEYBOARD_BUFFER : I8042_MOUSE_BUFFER;
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u8 const second_port_flag = device == HIDDevice::Type::Keyboard ? 0 : I8042StatusFlag::SecondPS2PortOutputBuffer;
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for (;;) {
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u8 status = IO::in8(I8042_STATUS);
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if ((status & I8042_BUFFER_FULL) && (device == HIDDevice::Type::Unknown || ((status & I8042_WHICH_BUFFER) == buffer_type)))
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u8 status = IO::in8(I8042Port::Status);
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if (!(status & I8042StatusFlag::OutputBuffer))
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continue;
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if (device == HIDDevice::Type::Unknown)
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return;
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if ((status & I8042StatusFlag::SecondPS2PortOutputBuffer) == second_port_flag)
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return;
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}
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}
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@ -244,7 +249,8 @@ void I8042Controller::prepare_for_output()
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{
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VERIFY(m_lock.is_locked());
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for (;;) {
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if (!(IO::in8(I8042_STATUS) & 2))
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u8 status = IO::in8(I8042Port::Status);
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if (!(status & I8042StatusFlag::InputBuffer))
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return;
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}
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}
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@ -13,16 +13,55 @@
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namespace Kernel {
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#define I8042_BUFFER 0x60
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#define I8042_STATUS 0x64
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#define I8042_ACK 0xFA
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#define I8042_RESEND 0xFE
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#define I8042_BUFFER_FULL 0x01
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enum I8042Port : u8 {
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Buffer = 0x60,
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Command = 0x64,
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Status = 0x64,
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};
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#define I8042_WHICH_BUFFER 0x20
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enum I8042Command : u8 {
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ReadConfiguration = 0x20,
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WriteConfiguration = 0x60,
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DisableSecondPS2Port = 0xA7,
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EnableSecondPS2Port = 0xA8,
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TestSecondPS2Port = 0xA9,
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TestPS2Controller = 0xAA,
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TestFirstPS2Port = 0xAB,
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DisableFirstPS2Port = 0xAD,
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EnableFirstPS2Port = 0xAE,
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WriteSecondPS2PortInputBuffer = 0xD4,
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GetDeviceID = 0xF2,
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SetSampleRate = 0xF3,
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EnablePacketStreaming = 0xF4,
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SetDefaults = 0xF6,
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Reset = 0xFF,
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};
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#define I8042_KEYBOARD_BUFFER 0x00
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#define I8042_MOUSE_BUFFER 0x20
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enum I8042ConfigurationFlag : u8 {
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FirstPS2PortInterrupt = 1 << 0,
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SecondPS2PortInterrupt = 1 << 1,
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SystemFlag = 1 << 2,
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FirstPS2PortClock = 1 << 4,
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SecondPS2PortClock = 1 << 5,
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FirstPS2PortTranslation = 1 << 6,
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};
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enum I8042StatusFlag : u8 {
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OutputBuffer = 1 << 0,
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InputBuffer = 1 << 1,
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System = 1 << 2,
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InputType = 1 << 3,
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SecondPS2PortOutputBuffer = 1 << 5,
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TimeoutError = 1 << 6,
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ParityError = 1 << 7,
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};
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enum I8042Response : u8 {
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ControllerTestPassed = 0x55,
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Success = 0xAA,
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Acknowledge = 0xFA,
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Resend = 0xFE,
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};
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class I8042Controller;
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class I8042Device {
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@ -63,7 +63,7 @@ void PS2KeyboardDevice::irq_handle_byte_read(u8 byte)
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break;
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}
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switch (ch) {
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case I8042_ACK:
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case I8042Response::Acknowledge:
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break;
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default:
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if ((m_modifiers & Mod_Alt) != 0 && ch >= 2 && ch <= ConsoleManagement::s_max_virtual_consoles + 1) {
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@ -16,17 +16,6 @@ namespace Kernel {
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#define IRQ_MOUSE 12
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#define PS2MOUSE_SET_RESOLUTION 0xE8
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#define PS2MOUSE_STATUS_REQUEST 0xE9
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#define PS2MOUSE_REQUEST_SINGLE_PACKET 0xEB
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#define PS2MOUSE_GET_DEVICE_ID 0xF2
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#define PS2MOUSE_SET_SAMPLE_RATE 0xF3
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#define PS2MOUSE_ENABLE_PACKET_STREAMING 0xF4
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#define PS2MOUSE_DISABLE_PACKET_STREAMING 0xF5
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#define PS2MOUSE_SET_DEFAULTS 0xF6
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#define PS2MOUSE_RESEND 0xFE
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#define PS2MOUSE_RESET 0xFF
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#define PS2MOUSE_INTELLIMOUSE_ID 0x03
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#define PS2MOUSE_INTELLIMOUSE_EXPLORER_ID 0x04
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@ -142,7 +131,7 @@ MousePacket PS2MouseDevice::parse_data_packet(const RawPacket& raw_packet)
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u8 PS2MouseDevice::get_device_id()
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{
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if (send_command(PS2MOUSE_GET_DEVICE_ID) != I8042_ACK)
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if (send_command(I8042Command::GetDeviceID) != I8042Response::Acknowledge)
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return 0;
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return read_from_device();
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}
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@ -155,22 +144,22 @@ u8 PS2MouseDevice::read_from_device()
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u8 PS2MouseDevice::send_command(u8 command)
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{
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u8 response = m_i8042_controller->send_command(instrument_type(), command);
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if (response != I8042_ACK)
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dbgln("PS2MouseDevice: Command {} got {} but expected ack: {}", command, response, I8042_ACK);
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if (response != I8042Response::Acknowledge)
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dbgln("PS2MouseDevice: Command {} got {} but expected ack: {}", command, response, static_cast<u8>(I8042Response::Acknowledge));
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return response;
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}
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u8 PS2MouseDevice::send_command(u8 command, u8 data)
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{
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u8 response = m_i8042_controller->send_command(instrument_type(), command, data);
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if (response != I8042_ACK)
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dbgln("PS2MouseDevice: Command {} got {} but expected ack: {}", command, response, I8042_ACK);
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if (response != I8042Response::Acknowledge)
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dbgln("PS2MouseDevice: Command {} got {} but expected ack: {}", command, response, static_cast<u8>(I8042Response::Acknowledge));
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return response;
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}
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void PS2MouseDevice::set_sample_rate(u8 rate)
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{
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send_command(PS2MOUSE_SET_SAMPLE_RATE, rate);
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send_command(I8042Command::SetSampleRate, rate);
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}
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UNMAP_AFTER_INIT RefPtr<PS2MouseDevice> PS2MouseDevice::try_to_initialize(const I8042Controller& ps2_controller)
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@ -192,11 +181,10 @@ UNMAP_AFTER_INIT bool PS2MouseDevice::initialize()
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u8 device_id = read_from_device();
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// Set default settings.
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if (send_command(PS2MOUSE_SET_DEFAULTS) != I8042_ACK)
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if (send_command(I8042Command::SetDefaults) != I8042Response::Acknowledge)
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return false;
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if (send_command(PS2MOUSE_ENABLE_PACKET_STREAMING) != I8042_ACK)
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if (send_command(I8042Command::EnablePacketStreaming) != I8042Response::Acknowledge)
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return false;
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if (device_id != PS2MOUSE_INTELLIMOUSE_ID) {
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