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https://github.com/LadybirdBrowser/ladybird.git
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c5882d3a18
The detection works very similarly to how we detect a mouse wheel, just another magical sequence of "set sample rate" requests to the mouse followed by an ID check.
350 lines
9.3 KiB
C++
350 lines
9.3 KiB
C++
/*
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* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice, this
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* list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <AK/Memory.h>
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#include <Kernel/Devices/PS2MouseDevice.h>
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#include <Kernel/Devices/VMWareBackdoor.h>
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#include <LibBareMetal/IO.h>
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namespace Kernel {
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#define IRQ_MOUSE 12
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#define I8042_BUFFER 0x60
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#define I8042_STATUS 0x64
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#define I8042_ACK 0xFA
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#define I8042_BUFFER_FULL 0x01
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#define I8042_WHICH_BUFFER 0x20
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#define I8042_MOUSE_BUFFER 0x20
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#define I8042_KEYBOARD_BUFFER 0x00
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#define PS2MOUSE_SET_RESOLUTION 0xE8
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#define PS2MOUSE_STATUS_REQUEST 0xE9
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#define PS2MOUSE_REQUEST_SINGLE_PACKET 0xEB
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#define PS2MOUSE_GET_DEVICE_ID 0xF2
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#define PS2MOUSE_SET_SAMPLE_RATE 0xF3
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#define PS2MOUSE_ENABLE_PACKET_STREAMING 0xF4
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#define PS2MOUSE_DISABLE_PACKET_STREAMING 0xF5
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#define PS2MOUSE_SET_DEFAULTS 0xF6
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#define PS2MOUSE_RESEND 0xFE
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#define PS2MOUSE_RESET 0xFF
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#define PS2MOUSE_INTELLIMOUSE_ID 0x03
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#define PS2MOUSE_INTELLIMOUSE_EXPLORER_ID 0x04
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//#define PS2MOUSE_DEBUG
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static PS2MouseDevice* s_the;
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PS2MouseDevice::PS2MouseDevice()
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: IRQHandler(IRQ_MOUSE)
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, CharacterDevice(10, 1)
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{
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s_the = this;
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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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PS2MouseDevice& PS2MouseDevice::the()
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{
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return *s_the;
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}
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void PS2MouseDevice::handle_irq(const RegisterState&)
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{
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if (auto* backdoor = VMWareBackdoor::the()) {
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if (backdoor->vmmouse_is_absolute()) {
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IO::in8(I8042_BUFFER);
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auto packet = backdoor->receive_mouse_packet();
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if (packet.has_value())
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m_queue.enqueue(packet.value());
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return;
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}
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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_WHICH_BUFFER) == I8042_MOUSE_BUFFER) && (status & I8042_BUFFER_FULL)))
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return;
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u8 data = IO::in8(I8042_BUFFER);
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m_data[m_data_state] = data;
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auto commit_packet = [&] {
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m_data_state = 0;
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#ifdef PS2MOUSE_DEBUG
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dbg() << "PS2Mouse: " << m_data[1] << ", " << m_data[2] << " " << ((m_data[0] & 1) ? "Left" : "") << " " << ((m_data[0] & 2) ? "Right" : "") << " (buffered: " << m_queue.size() << ")";
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#endif
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parse_data_packet();
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};
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switch (m_data_state) {
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case 0:
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if (!(data & 0x08)) {
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dbg() << "PS2Mouse: Stream out of sync.";
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break;
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}
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++m_data_state;
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break;
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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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if (m_has_wheel) {
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++m_data_state;
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break;
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}
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commit_packet();
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break;
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case 3:
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ASSERT(m_has_wheel);
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commit_packet();
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break;
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}
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}
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}
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void PS2MouseDevice::parse_data_packet()
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{
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int x = m_data[1];
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int y = m_data[2];
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int z = 0;
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if (m_has_wheel)
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z = (char)m_data[3];
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bool x_overflow = m_data[0] & 0x40;
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bool y_overflow = m_data[0] & 0x80;
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bool x_sign = m_data[0] & 0x10;
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bool y_sign = m_data[0] & 0x20;
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if (x && x_sign)
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x -= 0x100;
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if (y && y_sign)
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y -= 0x100;
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if (x_overflow || y_overflow) {
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x = 0;
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y = 0;
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}
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MousePacket packet;
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packet.x = x;
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packet.y = y;
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packet.z = z;
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packet.buttons = m_data[0] & 0x07;
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if (m_has_five_buttons) {
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if (m_data[3] & 0x10)
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packet.buttons |= MousePacket::BackButton;
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if (m_data[3] & 0x20)
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packet.buttons |= MousePacket::ForwardButton;
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}
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packet.is_relative = true;
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#ifdef PS2MOUSE_DEBUG
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dbg() << "PS2 Relative Mouse: Buttons " << String::format("%x", packet.buttons);
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dbg() << "Mouse: X " << packet.x << ", Y " << packet.y << ", Z " << packet.z;
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#endif
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m_queue.enqueue(packet);
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}
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void PS2MouseDevice::wait_then_write(u8 port, u8 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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u8 PS2MouseDevice::wait_then_read(u8 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(I8042_STATUS, 0xa8);
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check_device_presence();
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if (m_device_present)
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initialize_device();
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}
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void PS2MouseDevice::check_device_presence()
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{
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mouse_write(PS2MOUSE_REQUEST_SINGLE_PACKET);
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u8 maybe_ack = mouse_read();
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if (maybe_ack == I8042_ACK) {
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m_device_present = true;
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klog() << "PS2MouseDevice: Device detected";
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// the mouse will send a packet of data, since that's what we asked
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// for. we don't care about the content.
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mouse_read();
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mouse_read();
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mouse_read();
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} else {
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m_device_present = false;
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klog() << "PS2MouseDevice: Device not detected";
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}
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}
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u8 PS2MouseDevice::get_device_id()
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{
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mouse_write(PS2MOUSE_GET_DEVICE_ID);
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expect_ack();
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return mouse_read();
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}
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void PS2MouseDevice::set_sample_rate(u8 rate)
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{
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mouse_write(PS2MOUSE_SET_SAMPLE_RATE);
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expect_ack();
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mouse_write(rate);
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expect_ack();
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}
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void PS2MouseDevice::initialize_device()
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{
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if (!m_device_present)
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return;
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// Enable interrupts
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wait_then_write(I8042_STATUS, 0x20);
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// Enable the PS/2 mouse IRQ (12).
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// NOTE: The keyboard uses IRQ 1 (and is enabled by bit 0 in this register).
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u8 status = wait_then_read(I8042_BUFFER) | 2;
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wait_then_write(I8042_STATUS, 0x60);
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wait_then_write(I8042_BUFFER, status);
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// Set default settings.
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mouse_write(PS2MOUSE_SET_DEFAULTS);
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expect_ack();
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// Enable.
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mouse_write(PS2MOUSE_ENABLE_PACKET_STREAMING);
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expect_ack();
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u8 device_id = get_device_id();
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if (device_id != PS2MOUSE_INTELLIMOUSE_ID) {
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// Send magical wheel initiation sequence.
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set_sample_rate(200);
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set_sample_rate(100);
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set_sample_rate(80);
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device_id = get_device_id();
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}
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if (device_id == PS2MOUSE_INTELLIMOUSE_ID) {
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m_has_wheel = true;
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klog() << "PS2MouseDevice: Mouse wheel enabled!";
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} else {
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klog() << "PS2MouseDevice: No mouse wheel detected!";
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}
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if (device_id == PS2MOUSE_INTELLIMOUSE_ID) {
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// Try to enable 5 buttons as well!
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set_sample_rate(200);
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set_sample_rate(200);
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set_sample_rate(80);
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device_id = get_device_id();
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}
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if (device_id == PS2MOUSE_INTELLIMOUSE_EXPLORER_ID) {
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m_has_five_buttons = true;
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klog() << "PS2MouseDevice: 5 buttons enabled!";
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}
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enable_irq();
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}
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void PS2MouseDevice::expect_ack()
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{
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u8 data = mouse_read();
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ASSERT(data == I8042_ACK);
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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(I8042_STATUS) & 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(I8042_STATUS) & 2))
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return;
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}
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}
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void PS2MouseDevice::mouse_write(u8 data)
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{
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prepare_for_output();
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IO::out8(I8042_STATUS, 0xd4);
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prepare_for_output();
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IO::out8(I8042_BUFFER, data);
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}
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u8 PS2MouseDevice::mouse_read()
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{
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prepare_for_input();
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return IO::in8(I8042_BUFFER);
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}
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bool PS2MouseDevice::can_read(const FileDescription&, size_t) const
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{
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return !m_queue.is_empty();
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}
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ssize_t PS2MouseDevice::read(FileDescription&, size_t, u8* buffer, ssize_t size)
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{
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ASSERT(size > 0);
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size_t nread = 0;
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size_t remaining_space_in_buffer = static_cast<size_t>(size) - nread;
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while (!m_queue.is_empty() && remaining_space_in_buffer) {
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auto packet = m_queue.dequeue();
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#ifdef PS2MOUSE_DEBUG
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dbg() << "PS2 Mouse Read: Buttons " << String::format("%x", packet.buttons);
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dbg() << "PS2 Mouse: X " << packet.x << ", Y " << packet.y << ", Z " << packet.z << " Relative " << packet.buttons;
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dbg() << "PS2 Mouse Read: Filter packets";
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#endif
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size_t bytes_read_from_packet = min(remaining_space_in_buffer, sizeof(MousePacket));
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memcpy(buffer + nread, &packet, bytes_read_from_packet);
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nread += bytes_read_from_packet;
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remaining_space_in_buffer -= bytes_read_from_packet;
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}
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return nread;
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}
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ssize_t PS2MouseDevice::write(FileDescription&, size_t, const u8*, ssize_t)
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{
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return 0;
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}
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}
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