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/*
* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <AK/Memory.h>
#include <AK/Singleton.h>
#include <Kernel/Debug.h>
#include <Kernel/Devices/HID/PS2MouseDevice.h>
#include <Kernel/Devices/VMWareBackdoor.h>
#include <Kernel/IO.h>
namespace Kernel {
#define IRQ_MOUSE 12
#define PS2MOUSE_SET_RESOLUTION 0xE8
#define PS2MOUSE_STATUS_REQUEST 0xE9
#define PS2MOUSE_REQUEST_SINGLE_PACKET 0xEB
#define PS2MOUSE_GET_DEVICE_ID 0xF2
#define PS2MOUSE_SET_SAMPLE_RATE 0xF3
#define PS2MOUSE_ENABLE_PACKET_STREAMING 0xF4
#define PS2MOUSE_DISABLE_PACKET_STREAMING 0xF5
#define PS2MOUSE_SET_DEFAULTS 0xF6
#define PS2MOUSE_RESEND 0xFE
#define PS2MOUSE_RESET 0xFF
#define PS2MOUSE_INTELLIMOUSE_ID 0x03
#define PS2MOUSE_INTELLIMOUSE_EXPLORER_ID 0x04
UNMAP_AFTER_INIT PS2MouseDevice::PS2MouseDevice(const I8042Controller& ps2_controller)
: IRQHandler(IRQ_MOUSE)
, MouseDevice()
, I8042Device(ps2_controller)
{
}
UNMAP_AFTER_INIT PS2MouseDevice::~PS2MouseDevice()
{
}
void PS2MouseDevice::handle_irq(const RegisterState&)
{
// The controller will read the data and call irq_handle_byte_read
// for the appropriate device
m_i8042_controller->irq_process_input_buffer(instrument_type());
}
void PS2MouseDevice::irq_handle_byte_read(u8 byte)
{
auto commit_packet = [&] {
m_data_state = 0;
dbgln_if(PS2MOUSE_DEBUG, "PS2Mouse: {}, {} {} {}",
m_data.bytes[1],
m_data.bytes[2],
(m_data.bytes[0] & 1) ? "Left" : "",
(m_data.bytes[0] & 2) ? "Right" : "");
m_entropy_source.add_random_event(m_data.dword);
{
ScopedSpinLock lock(m_queue_lock);
m_queue.enqueue(parse_data_packet(m_data));
}
evaluate_block_conditions();
};
VERIFY(m_data_state < sizeof(m_data.bytes) / sizeof(m_data.bytes[0]));
m_data.bytes[m_data_state] = byte;
switch (m_data_state) {
case 0:
if (!(byte & 0x08)) {
dbgln("PS2Mouse: Stream out of sync.");
break;
}
++m_data_state;
break;
case 1:
++m_data_state;
break;
case 2:
if (m_has_wheel) {
++m_data_state;
break;
}
commit_packet();
break;
case 3:
VERIFY(m_has_wheel);
commit_packet();
break;
}
}
MousePacket PS2MouseDevice::parse_data_packet(const RawPacket& raw_packet)
{
int x = raw_packet.bytes[1];
int y = raw_packet.bytes[2];
int z = 0;
if (m_has_wheel) {
// FIXME: For non-Intellimouse, this is a full byte.
// However, for now, m_has_wheel is only set for Intellimouse.
z = (char)(raw_packet.bytes[3] & 0x0f);
// -1 in 4 bits
if (z == 15)
z = -1;
}
bool x_overflow = raw_packet.bytes[0] & 0x40;
bool y_overflow = raw_packet.bytes[0] & 0x80;
bool x_sign = raw_packet.bytes[0] & 0x10;
bool y_sign = raw_packet.bytes[0] & 0x20;
if (x && x_sign)
x -= 0x100;
if (y && y_sign)
y -= 0x100;
if (x_overflow || y_overflow) {
x = 0;
y = 0;
}
MousePacket packet;
packet.x = x;
packet.y = y;
packet.z = z;
packet.buttons = raw_packet.bytes[0] & 0x07;
if (m_has_five_buttons) {
if (raw_packet.bytes[3] & 0x10)
packet.buttons |= MousePacket::BackButton;
if (raw_packet.bytes[3] & 0x20)
packet.buttons |= MousePacket::ForwardButton;
}
packet.is_relative = true;
#if PS2MOUSE_DEBUG
dbgln("PS2 Relative Mouse: Buttons {:x}", packet.buttons);
dbgln("Mouse: X {}, Y {}, Z {}", packet.x, packet.y, packet.z);
#endif
return packet;
}
u8 PS2MouseDevice::get_device_id()
{
if (send_command(PS2MOUSE_GET_DEVICE_ID) != I8042_ACK)
return 0;
return read_from_device();
}
u8 PS2MouseDevice::read_from_device()
{
return m_i8042_controller->read_from_device(instrument_type());
}
u8 PS2MouseDevice::send_command(u8 command)
{
u8 response = m_i8042_controller->send_command(instrument_type(), command);
if (response != I8042_ACK)
dbgln("PS2MouseDevice: Command {} got {} but expected ack: {}", command, response, I8042_ACK);
return response;
}
u8 PS2MouseDevice::send_command(u8 command, u8 data)
{
u8 response = m_i8042_controller->send_command(instrument_type(), command, data);
if (response != I8042_ACK)
dbgln("PS2MouseDevice: Command {} got {} but expected ack: {}", command, response, I8042_ACK);
return response;
}
void PS2MouseDevice::set_sample_rate(u8 rate)
{
send_command(PS2MOUSE_SET_SAMPLE_RATE, rate);
}
UNMAP_AFTER_INIT RefPtr<PS2MouseDevice> PS2MouseDevice::try_to_initialize(const I8042Controller& ps2_controller)
{
auto device = adopt_ref(*new PS2MouseDevice(ps2_controller));
if (device->initialize())
return device;
return nullptr;
}
UNMAP_AFTER_INIT bool PS2MouseDevice::initialize()
{
if (!m_i8042_controller->reset_device(instrument_type())) {
dbgln("PS2MouseDevice: I8042 controller failed to reset device");
return false;
}
u8 device_id = read_from_device();
// Set default settings.
if (send_command(PS2MOUSE_SET_DEFAULTS) != I8042_ACK)
return false;
if (send_command(PS2MOUSE_ENABLE_PACKET_STREAMING) != I8042_ACK)
return false;
if (device_id != PS2MOUSE_INTELLIMOUSE_ID) {
// Send magical wheel initiation sequence.
set_sample_rate(200);
set_sample_rate(100);
set_sample_rate(80);
device_id = get_device_id();
}
if (device_id == PS2MOUSE_INTELLIMOUSE_ID) {
m_has_wheel = true;
dmesgln("PS2MouseDevice: Mouse wheel enabled!");
} else {
dmesgln("PS2MouseDevice: No mouse wheel detected!");
}
if (device_id == PS2MOUSE_INTELLIMOUSE_ID) {
// Try to enable 5 buttons as well!
set_sample_rate(200);
set_sample_rate(200);
set_sample_rate(80);
device_id = get_device_id();
}
if (device_id == PS2MOUSE_INTELLIMOUSE_EXPLORER_ID) {
m_has_five_buttons = true;
dmesgln("PS2MouseDevice: 5 buttons enabled!");
}
return true;
}
}
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