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/*
* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <AK/Memory.h>
#include <Kernel/Arch/x86/Hypervisor/VMWareBackdoor.h>
#include <Kernel/Arch/x86/ISABus/HID/PS2MouseDevice.h>
#include <Kernel/Debug.h>
#include <Kernel/Devices/DeviceManagement.h>
#include <Kernel/Sections.h>
namespace Kernel {
#define IRQ_MOUSE 12
#define PS2MOUSE_INTELLIMOUSE_ID 0x03
#define PS2MOUSE_INTELLIMOUSE_EXPLORER_ID 0x04
UNMAP_AFTER_INIT PS2MouseDevice::PS2MouseDevice(I8042Controller const& ps2_controller)
: IRQHandler(IRQ_MOUSE)
, MouseDevice()
, I8042Device(ps2_controller)
{
}
UNMAP_AFTER_INIT PS2MouseDevice::~PS2MouseDevice() = default;
bool PS2MouseDevice::handle_irq(RegisterState const&)
{
// The controller will read the data and call irq_handle_byte_read
// for the appropriate device
return 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);
{
SpinlockLocker 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(RawPacket const& raw_packet)
{
int x = raw_packet.bytes[1];
int y = raw_packet.bytes[2];
int z = 0;
int w = 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;
if ((raw_packet.bytes[3] & 0xc0) == 0x40) {
// FIXME: Scroll only functions correctly when the sign is flipped there
w = -z;
z = 0;
} else {
w = 0;
}
}
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.w = w;
packet.buttons = raw_packet.bytes[0] & 0x07;
if (m_has_five_buttons) {
if (raw_packet.bytes[3] & 0x10)
packet.buttons |= MousePacket::BackwardButton;
if (raw_packet.bytes[3] & 0x20)
packet.buttons |= MousePacket::ForwardButton;
}
packet.is_relative = true;
dbgln_if(PS2MOUSE_DEBUG, "PS2 Relative Mouse: Buttons {:x}", packet.buttons);
dbgln_if(PS2MOUSE_DEBUG, "Mouse: X {}, Y {}, Z {}, W {}", packet.x, packet.y, packet.z, packet.w);
return packet;
}
ErrorOr<u8> PS2MouseDevice::get_device_id()
{
TRY(send_command(I8042Command::GetDeviceID));
return read_from_device();
}
ErrorOr<u8> PS2MouseDevice::read_from_device()
{
return m_i8042_controller->read_from_device(instrument_type());
}
ErrorOr<u8> PS2MouseDevice::send_command(u8 command)
{
u8 response = TRY(m_i8042_controller->send_command(instrument_type(), command));
if (response != I8042Response::Acknowledge) {
dbgln("PS2MouseDevice: Command {} got {} but expected ack: {}", command, response, static_cast<u8>(I8042Response::Acknowledge));
return Error::from_errno(EIO);
}
return response;
}
ErrorOr<u8> PS2MouseDevice::send_command(u8 command, u8 data)
{
u8 response = TRY(m_i8042_controller->send_command(instrument_type(), command, data));
if (response != I8042Response::Acknowledge) {
dbgln("PS2MouseDevice: Command {} got {} but expected ack: {}", command, response, static_cast<u8>(I8042Response::Acknowledge));
return Error::from_errno(EIO);
}
return response;
}
ErrorOr<void> PS2MouseDevice::set_sample_rate(u8 rate)
{
TRY(send_command(I8042Command::SetSampleRate, rate));
return {};
}
UNMAP_AFTER_INIT ErrorOr<NonnullLockRefPtr<PS2MouseDevice>> PS2MouseDevice::try_to_initialize(I8042Controller const& ps2_controller)
{
auto mouse_device = TRY(DeviceManagement::try_create_device<PS2MouseDevice>(ps2_controller));
TRY(mouse_device->initialize());
return mouse_device;
}
UNMAP_AFTER_INIT ErrorOr<void> PS2MouseDevice::initialize()
{
TRY(m_i8042_controller->reset_device(instrument_type()));
u8 device_id = TRY(read_from_device());
TRY(send_command(I8042Command::SetDefaults));
TRY(send_command(I8042Command::EnablePacketStreaming));
if (device_id != PS2MOUSE_INTELLIMOUSE_ID) {
// Send magical wheel initiation sequence.
TRY(set_sample_rate(200));
TRY(set_sample_rate(100));
TRY(set_sample_rate(80));
device_id = TRY(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!
TRY(set_sample_rate(200));
TRY(set_sample_rate(200));
TRY(set_sample_rate(80));
device_id = TRY(get_device_id());
}
if (device_id == PS2MOUSE_INTELLIMOUSE_EXPLORER_ID) {
m_has_five_buttons = true;
dmesgln("PS2MouseDevice: 5 buttons enabled!");
}
return {};
}
}
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