mirror of
https://github.com/RGBCube/serenity
synced 2025-10-31 07:52:45 +00:00
266 lines
8 KiB
C++
266 lines
8 KiB
C++
/*
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* Copyright (c) 2020, the SerenityOS developers.
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <Kernel/Devices/HID/I8042Controller.h>
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#include <Kernel/Devices/HID/PS2KeyboardDevice.h>
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#include <Kernel/Devices/HID/PS2MouseDevice.h>
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#include <Kernel/Devices/HID/VMWareMouseDevice.h>
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#include <Kernel/IO.h>
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#include <Kernel/Sections.h>
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namespace Kernel {
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UNMAP_AFTER_INIT NonnullRefPtr<I8042Controller> I8042Controller::initialize()
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{
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return adopt_ref(*new I8042Controller());
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}
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RefPtr<MouseDevice> I8042Controller::mouse() const
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{
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return m_mouse_device;
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}
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RefPtr<KeyboardDevice> I8042Controller::keyboard() const
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{
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return m_keyboard_device;
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}
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UNMAP_AFTER_INIT I8042Controller::I8042Controller()
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{
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}
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UNMAP_AFTER_INIT void I8042Controller::detect_devices()
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{
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u8 configuration;
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{
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ScopedSpinLock 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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// 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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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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// 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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// 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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} 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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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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} 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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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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} else {
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dbgln("I8042: Mouse port not available");
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}
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}
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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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}
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}
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// Try to detect and initialize the devices
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if (m_first_port_available) {
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m_keyboard_device = PS2KeyboardDevice::try_to_initialize(*this);
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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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ScopedSpinLock 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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}
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}
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if (m_second_port_available) {
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m_mouse_device = VMWareMouseDevice::try_to_initialize(*this);
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if (!m_mouse_device) {
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m_mouse_device = PS2MouseDevice::try_to_initialize(*this);
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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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ScopedSpinLock 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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}
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}
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}
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// Enable IRQs after both are detected and initialized
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if (m_keyboard_device)
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m_keyboard_device->enable_interrupts();
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if (m_mouse_device)
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m_mouse_device->enable_interrupts();
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}
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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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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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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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return true;
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}
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if (data_for_device == HIDDevice::Type::Keyboard) {
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VERIFY(m_keyboard_device);
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static_cast<PS2KeyboardDevice&>(*m_keyboard_device).irq_handle_byte_read(byte);
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return true;
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}
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return false;
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}
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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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return;
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IO::in8(I8042_BUFFER);
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}
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}
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bool I8042Controller::do_reset_device(HIDDevice::Type device)
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{
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VERIFY(device != HIDDevice::Type::Unknown);
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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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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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}
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u8 I8042Controller::do_send_command(HIDDevice::Type device, u8 command)
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{
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VERIFY(device != HIDDevice::Type::Unknown);
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VERIFY(m_lock.is_locked());
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VERIFY(!Processor::current().in_irq());
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return do_write_to_device(device, command);
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}
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u8 I8042Controller::do_send_command(HIDDevice::Type device, u8 command, u8 data)
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{
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VERIFY(device != HIDDevice::Type::Unknown);
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VERIFY(m_lock.is_locked());
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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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response = do_write_to_device(device, data);
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return response;
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}
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u8 I8042Controller::do_write_to_device(HIDDevice::Type device, u8 data)
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{
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VERIFY(device != HIDDevice::Type::Unknown);
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VERIFY(m_lock.is_locked());
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VERIFY(!Processor::current().in_irq());
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int attempts = 0;
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u8 response;
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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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}
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prepare_for_output();
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IO::out8(I8042_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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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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}
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u8 I8042Controller::do_read_from_device(HIDDevice::Type device)
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{
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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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}
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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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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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return;
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}
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}
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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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return;
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}
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}
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void I8042Controller::do_wait_then_write(u8 port, u8 data)
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{
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VERIFY(m_lock.is_locked());
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prepare_for_output();
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IO::out8(port, data);
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}
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u8 I8042Controller::do_wait_then_read(u8 port)
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{
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VERIFY(m_lock.is_locked());
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prepare_for_input(HIDDevice::Type::Unknown);
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return IO::in8(port);
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}
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}
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