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#include "PS2MouseDevice.h"
#include "IO.h"
//#define PS2MOUSE_DEBUG
static PS2MouseDevice* s_the;
PS2MouseDevice::PS2MouseDevice()
: IRQHandler(12)
, CharacterDevice(10, 1)
{
s_the = this;
initialize();
}
PS2MouseDevice::~PS2MouseDevice()
{
}
PS2MouseDevice& PS2MouseDevice::the()
{
return *s_the;
}
void PS2MouseDevice::handle_irq()
{
byte data = IO::in8(0x60);
m_data[m_data_state] = data;
switch (m_data_state) {
case 0:
ASSERT(data & 0x08);
++m_data_state;
break;
case 1:
++m_data_state;
break;
case 2:
m_data_state = 0;
#ifdef PS2MOUSE_DEBUG
dbgprintf("PS2Mouse: %d, %d %s %s\n",
m_data[1],
m_data[2],
(m_data[0] & 1) ? "Left" : "",
(m_data[0] & 2) ? "Right" : ""
);
#endif
m_queue.enqueue(m_data[0]);
m_queue.enqueue(m_data[1]);
m_queue.enqueue(m_data[2]);
break;
}
}
void PS2MouseDevice::wait_then_write(byte port, byte data)
{
prepare_for_output();
IO::out8(port, data);
}
byte PS2MouseDevice::wait_then_read(byte port)
{
prepare_for_input();
return IO::in8(port);
}
void PS2MouseDevice::initialize()
{
// Enable PS aux port
wait_then_write(0x64, 0xa8);
// Enable interrupts
wait_then_write(0x64, 0x20);
byte status = wait_then_read(0x60) | 2;
wait_then_write(0x64, 0x60);
wait_then_write(0x60, status);
// Set default settings.
mouse_write(0xf6);
byte ack1 = mouse_read();
ASSERT(ack1 == 0xfa);
// Enable.
mouse_write(0xf4);
byte ack2 = mouse_read();
ASSERT(ack2 == 0xfa);
enable_irq();
}
void PS2MouseDevice::prepare_for_input()
{
for (;;) {
if (IO::in8(0x64) & 1)
return;
}
}
void PS2MouseDevice::prepare_for_output()
{
for (;;) {
if (!(IO::in8(0x64) & 2))
return;
}
}
void PS2MouseDevice::mouse_write(byte data)
{
prepare_for_output();
IO::out8(0x64, 0xd4);
prepare_for_output();
IO::out8(0x60, data);
}
byte PS2MouseDevice::mouse_read()
{
prepare_for_input();
return IO::in8(0x60);
}
bool PS2MouseDevice::can_read(Process&) const
{
return !m_queue.is_empty();
}
ssize_t PS2MouseDevice::read(Process&, byte* buffer, size_t size)
{
ssize_t nread = 0;
while ((size_t)nread < size) {
if (m_queue.is_empty())
break;
buffer[nread++] = m_queue.dequeue();
}
return nread;
}
ssize_t PS2MouseDevice::write(Process&, const byte*, size_t)
{
return 0;
}
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