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Add a simple PS/2 mouse device.
It's not hooked up to anything just yet, but it does read movement deltas.
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parent
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4 changed files with 146 additions and 1 deletions
113
Kernel/PS2MouseDevice.cpp
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113
Kernel/PS2MouseDevice.cpp
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#include "PS2MouseDevice.h"
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#include "IO.h"
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PS2MouseDevice::PS2MouseDevice()
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: IRQHandler(12)
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, CharacterDevice(10, 1)
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{
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initialize();
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}
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PS2MouseDevice::~PS2MouseDevice()
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{
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}
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void PS2MouseDevice::handle_irq()
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{
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m_data[m_data_state] = IO::in8(0x60);
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switch (m_data_state) {
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case 0:
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case 1:
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++m_data_state;
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break;
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case 2:
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m_data_state = 0;
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dbgprintf("PS2Mouse: %d, %d\n", m_data[1], m_data[2]);
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break;
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}
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}
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void PS2MouseDevice::wait_then_write(byte port, byte data)
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{
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prepare_for_output();
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IO::out8(port, data);
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}
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byte PS2MouseDevice::wait_then_read(byte port)
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{
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prepare_for_input();
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return IO::in8(port);
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}
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void PS2MouseDevice::initialize()
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{
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// Enable PS aux port
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wait_then_write(0x64, 0xa8);
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// Enable interrupts
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wait_then_write(0x64, 0x20);
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byte status = wait_then_read(0x60) | 2;
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wait_then_write(0x64, 0x60);
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wait_then_write(0x60, status);
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// Set default settings.
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mouse_write(0xf6);
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byte ack1 = mouse_read();
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ASSERT(ack1 == 0xfa);
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// Enable.
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mouse_write(0xf4);
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byte ack2 = mouse_read();
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ASSERT(ack2 == 0xfa);
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enable_irq();
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}
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void PS2MouseDevice::prepare_for_input()
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{
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for (;;) {
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if (IO::in8(0x64) & 1)
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return;
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}
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}
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void PS2MouseDevice::prepare_for_output()
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{
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for (;;) {
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if (!(IO::in8(0x64) & 2))
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return;
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}
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}
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void PS2MouseDevice::mouse_write(byte data)
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{
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prepare_for_output();
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IO::out8(0x64, 0xd4);
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prepare_for_output();
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IO::out8(0x60, data);
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}
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byte PS2MouseDevice::mouse_read()
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{
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prepare_for_input();
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return IO::in8(0x60);
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}
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bool PS2MouseDevice::has_data_available_for_reading() const
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{
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ASSERT_NOT_REACHED();
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return false;
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}
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ssize_t PS2MouseDevice::read(byte* buffer, size_t buffer_size)
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{
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ASSERT_NOT_REACHED();
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return 0;
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}
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ssize_t PS2MouseDevice::write(const byte *buffer, size_t buffer_size)
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{
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ASSERT_NOT_REACHED();
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return 0;
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}
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