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Kernel: Enumify all magic constants for I8042 devices

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This makes the code much easier to read.
This commit is contained in:
Jelle Raaijmakers 2021-10-24 19:51:00 +02:00 • committed by Andreas Kling
parent 0a748de1a0
commit 26c84967fa
4 changed files with 115 additions and 82 deletions
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112
Kernel/Devices/HID/I8042Controller.cpp
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@ -37,51 +37,51 @@ UNMAP_AFTER_INIT void I8042Controller::detect_devices()
{
SpinlockLocker lock(m_lock);
// Disable devices
do_wait_then_write(I8042_STATUS, 0xad);
do_wait_then_write(I8042_STATUS, 0xa7); // ignored if it doesn't exist
do_wait_then_write(I8042Port::Command, I8042Command::DisableFirstPS2Port);
do_wait_then_write(I8042Port::Command, I8042Command::DisableSecondPS2Port); // ignored if it doesn't exist
// Drain buffers
do_drain();
do_wait_then_write(I8042_STATUS, 0x20);
configuration = do_wait_then_read(I8042_BUFFER);
do_wait_then_write(I8042_STATUS, 0x60);
configuration &= ~3; // Disable IRQs for all
do_wait_then_write(I8042_BUFFER, configuration);
do_wait_then_write(I8042Port::Command, I8042Command::ReadConfiguration);
configuration = do_wait_then_read(I8042Port::Buffer);
do_wait_then_write(I8042Port::Command, I8042Command::WriteConfiguration);
configuration &= ~I8042ConfigurationFlag::FirstPS2PortInterrupt;
configuration &= ~I8042ConfigurationFlag::SecondPS2PortInterrupt;
do_wait_then_write(I8042Port::Buffer, configuration);
m_is_dual_channel = (configuration & (1 << 5)) != 0;
dbgln("I8042: {} channel controller",
m_is_dual_channel ? "Dual" : "Single");
m_is_dual_channel = (configuration & I8042ConfigurationFlag::SecondPS2PortClock) != 0;
dbgln("I8042: {} channel controller", m_is_dual_channel ? "Dual" : "Single");
// Perform controller self-test
do_wait_then_write(I8042_STATUS, 0xaa);
if (do_wait_then_read(I8042_BUFFER) == 0x55) {
do_wait_then_write(I8042Port::Command, I8042Command::TestPS2Controller);
if (do_wait_then_read(I8042Port::Buffer) == I8042Response::ControllerTestPassed) {
// Restore configuration in case the controller reset
do_wait_then_write(I8042_STATUS, 0x60);
do_wait_then_write(I8042_BUFFER, configuration);
do_wait_then_write(I8042Port::Command, I8042Command::WriteConfiguration);
do_wait_then_write(I8042Port::Buffer, configuration);
} else {
dbgln("I8042: Controller self test failed");
}
// Test ports and enable them if available
do_wait_then_write(I8042_STATUS, 0xab); // test
m_first_port_available = (do_wait_then_read(I8042_BUFFER) == 0);
do_wait_then_write(I8042Port::Command, I8042Command::TestFirstPS2Port);
m_first_port_available = (do_wait_then_read(I8042Port::Buffer) == 0);
if (m_first_port_available) {
do_wait_then_write(I8042_STATUS, 0xae); //enable
configuration |= 1;
configuration &= ~(1 << 4);
do_wait_then_write(I8042Port::Command, I8042Command::EnableFirstPS2Port);
configuration |= I8042ConfigurationFlag::FirstPS2PortInterrupt;
configuration &= ~I8042ConfigurationFlag::FirstPS2PortClock;
} else {
dbgln("I8042: Keyboard port not available");
}
if (m_is_dual_channel) {
do_wait_then_write(I8042_STATUS, 0xa9); // test
m_second_port_available = (do_wait_then_read(I8042_BUFFER) == 0);
do_wait_then_write(I8042Port::Command, I8042Command::TestSecondPS2Port);
m_second_port_available = (do_wait_then_read(I8042Port::Buffer) == 0);
if (m_second_port_available) {
do_wait_then_write(I8042_STATUS, 0xa8); // enable
configuration |= 2;
configuration &= ~(1 << 5);
do_wait_then_write(I8042Port::Command, I8042Command::EnableSecondPS2Port);
configuration |= I8042ConfigurationFlag::SecondPS2PortInterrupt;
configuration &= ~I8042ConfigurationFlag::SecondPS2PortClock;
} else {
dbgln("I8042: Mouse port not available");
}
@ -89,9 +89,10 @@ UNMAP_AFTER_INIT void I8042Controller::detect_devices()
// Enable IRQs for the ports that are usable
if (m_first_port_available || m_second_port_available) {
configuration &= ~0x30; // renable clocks
do_wait_then_write(I8042_STATUS, 0x60);
do_wait_then_write(I8042_BUFFER, configuration);
configuration &= ~I8042ConfigurationFlag::FirstPS2PortClock;
configuration &= ~I8042ConfigurationFlag::SecondPS2PortClock;
do_wait_then_write(I8042Port::Command, I8042Command::WriteConfiguration);
do_wait_then_write(I8042Port::Buffer, configuration);
}
}
@ -101,11 +102,11 @@ UNMAP_AFTER_INIT void I8042Controller::detect_devices()
if (!m_keyboard_device) {
dbgln("I8042: Keyboard device failed to initialize, disable");
m_first_port_available = false;
configuration &= ~1;
configuration |= 1 << 4;
configuration &= ~I8042ConfigurationFlag::FirstPS2PortInterrupt;
configuration |= I8042ConfigurationFlag::FirstPS2PortClock;
SpinlockLocker lock(m_lock);
do_wait_then_write(I8042_STATUS, 0x60);
do_wait_then_write(I8042_BUFFER, configuration);
do_wait_then_write(I8042Port::Command, I8042Command::WriteConfiguration);
do_wait_then_write(I8042Port::Buffer, configuration);
}
}
if (m_second_port_available) {
@ -115,10 +116,10 @@ UNMAP_AFTER_INIT void I8042Controller::detect_devices()
if (!m_mouse_device) {
dbgln("I8042: Mouse device failed to initialize, disable");
m_second_port_available = false;
configuration |= 1 << 5;
configuration |= I8042ConfigurationFlag::SecondPS2PortClock;
SpinlockLocker lock(m_lock);
do_wait_then_write(I8042_STATUS, 0x60);
do_wait_then_write(I8042_BUFFER, configuration);
do_wait_then_write(I8042Port::Command, I8042Command::WriteConfiguration);
do_wait_then_write(I8042Port::Buffer, configuration);
}
}
}
@ -134,11 +135,11 @@ bool I8042Controller::irq_process_input_buffer(HIDDevice::Type)
{
VERIFY(Processor::current_in_irq());
u8 status = IO::in8(I8042_STATUS);
if (!(status & I8042_BUFFER_FULL))
u8 status = IO::in8(I8042Port::Status);
if (!(status & I8042StatusFlag::OutputBuffer))
return false;
HIDDevice::Type data_for_device = ((status & I8042_WHICH_BUFFER) == I8042_MOUSE_BUFFER) ? HIDDevice::Type::Mouse : HIDDevice::Type::Keyboard;
u8 byte = IO::in8(I8042_BUFFER);
HIDDevice::Type data_for_device = ((status & I8042StatusFlag::SecondPS2PortOutputBuffer) == 0) ? HIDDevice::Type::Keyboard : HIDDevice::Type::Mouse;
u8 byte = IO::in8(I8042Port::Buffer);
if (data_for_device == HIDDevice::Type::Mouse) {
VERIFY(m_mouse_device);
static_cast<PS2MouseDevice&>(*m_mouse_device).irq_handle_byte_read(byte);
@ -155,10 +156,10 @@ bool I8042Controller::irq_process_input_buffer(HIDDevice::Type)
void I8042Controller::do_drain()
{
for (;;) {
u8 status = IO::in8(I8042_STATUS);
if (!(status & I8042_BUFFER_FULL))
u8 status = IO::in8(I8042Port::Status);
if (!(status & I8042StatusFlag::OutputBuffer))
return;
IO::in8(I8042_BUFFER);
IO::in8(I8042Port::Buffer);
}
}
@ -168,10 +169,10 @@ bool I8042Controller::do_reset_device(HIDDevice::Type device)
VERIFY(m_lock.is_locked());
VERIFY(!Processor::current_in_irq());
if (do_send_command(device, 0xff) != I8042_ACK)
if (do_send_command(device, I8042Command::Reset) != I8042Response::Acknowledge)
return false;
// Wait until we get the self-test result
return do_wait_then_read(I8042_BUFFER) == 0xaa;
return do_wait_then_read(I8042Port::Buffer) == I8042Response::Success;
}
u8 I8042Controller::do_send_command(HIDDevice::Type device, u8 command)
@ -192,7 +193,7 @@ u8 I8042Controller::do_send_command(HIDDevice::Type device, u8 command, u8 data)
VERIFY(!Processor::current_in_irq());
u8 response = do_write_to_device(device, command);
if (response == I8042_ACK)
if (response == I8042Response::Acknowledge)
response = do_write_to_device(device, data);
return response;
}
@ -209,13 +210,13 @@ u8 I8042Controller::do_write_to_device(HIDDevice::Type device, u8 data)
do {
if (device != HIDDevice::Type::Keyboard) {
prepare_for_output();
IO::out8(I8042_STATUS, 0xd4);
IO::out8(I8042Port::Command, I8042Command::WriteSecondPS2PortInputBuffer);
}
prepare_for_output();
IO::out8(I8042_BUFFER, data);
IO::out8(I8042Port::Buffer, data);
response = do_wait_then_read(I8042_BUFFER);
} while (response == I8042_RESEND && ++attempts < 3);
response = do_wait_then_read(I8042Port::Buffer);
} while (response == I8042Response::Resend && ++attempts < 3);
if (attempts >= 3)
dbgln("Failed to write byte to device, gave up");
return response;
@ -226,16 +227,20 @@ u8 I8042Controller::do_read_from_device(HIDDevice::Type device)
VERIFY(device != HIDDevice::Type::Unknown);
prepare_for_input(device);
return IO::in8(I8042_BUFFER);
return IO::in8(I8042Port::Buffer);
}
void I8042Controller::prepare_for_input(HIDDevice::Type device)
{
VERIFY(m_lock.is_locked());
const u8 buffer_type = device == HIDDevice::Type::Keyboard ? I8042_KEYBOARD_BUFFER : I8042_MOUSE_BUFFER;
u8 const second_port_flag = device == HIDDevice::Type::Keyboard ? 0 : I8042StatusFlag::SecondPS2PortOutputBuffer;
for (;;) {
u8 status = IO::in8(I8042_STATUS);
if ((status & I8042_BUFFER_FULL) && (device == HIDDevice::Type::Unknown || ((status & I8042_WHICH_BUFFER) == buffer_type)))
u8 status = IO::in8(I8042Port::Status);
if (!(status & I8042StatusFlag::OutputBuffer))
continue;
if (device == HIDDevice::Type::Unknown)
return;
if ((status & I8042StatusFlag::SecondPS2PortOutputBuffer) == second_port_flag)
return;
}
}
@ -244,7 +249,8 @@ void I8042Controller::prepare_for_output()
{
VERIFY(m_lock.is_locked());
for (;;) {
if (!(IO::in8(I8042_STATUS) & 2))
u8 status = IO::in8(I8042Port::Status);
if (!(status & I8042StatusFlag::InputBuffer))
return;
}
}