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Kernel: Detect 5-button PS/2 mouse if present :^)

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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.
This commit is contained in:
Andreas Kling 2020-05-02 22:06:17 +02:00
parent c00ff4ba62
commit c5882d3a18
3 changed files with 47 additions and 19 deletions
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61
Kernel/Devices/PS2MouseDevice.cpp
View file

@ -52,6 +52,7 @@ namespace Kernel {
#define PS2MOUSE_RESET 0xFF
#define PS2MOUSE_INTELLIMOUSE_ID 0x03
#define PS2MOUSE_INTELLIMOUSE_EXPLORER_ID 0x04
//#define PS2MOUSE_DEBUG
@ -151,6 +152,14 @@ void PS2MouseDevice::parse_data_packet()
packet.y = y;
packet.z = z;
packet.buttons = m_data[0] & 0x07;
if (m_has_five_buttons) {
if (m_data[3] & 0x10)
packet.buttons |= MousePacket::BackButton;
if (m_data[3] & 0x20)
packet.buttons |= MousePacket::ForwardButton;
}
packet.is_relative = true;
#ifdef PS2MOUSE_DEBUG
dbg() << "PS2 Relative Mouse: Buttons " << String::format("%x", packet.buttons);
@ -201,6 +210,21 @@ void PS2MouseDevice::check_device_presence()
}
}
u8 PS2MouseDevice::get_device_id()
{
mouse_write(PS2MOUSE_GET_DEVICE_ID);
expect_ack();
return mouse_read();
}
void PS2MouseDevice::set_sample_rate(u8 rate)
{
mouse_write(PS2MOUSE_SET_SAMPLE_RATE);
expect_ack();
mouse_write(rate);
expect_ack();
}
void PS2MouseDevice::initialize_device()
{
if (!m_device_present)
@ -223,28 +247,14 @@ void PS2MouseDevice::initialize_device()
mouse_write(PS2MOUSE_ENABLE_PACKET_STREAMING);
expect_ack();
mouse_write(PS2MOUSE_GET_DEVICE_ID);
expect_ack();
u8 device_id = mouse_read();
u8 device_id = get_device_id();
if (device_id != PS2MOUSE_INTELLIMOUSE_ID) {
// Send magical wheel initiation sequence.
mouse_write(PS2MOUSE_SET_SAMPLE_RATE);
expect_ack();
mouse_write(200);
expect_ack();
mouse_write(PS2MOUSE_SET_SAMPLE_RATE);
expect_ack();
mouse_write(100);
expect_ack();
mouse_write(PS2MOUSE_SET_SAMPLE_RATE);
expect_ack();
mouse_write(80);
expect_ack();
mouse_write(PS2MOUSE_GET_DEVICE_ID);
expect_ack();
device_id = mouse_read();
set_sample_rate(200);
set_sample_rate(100);
set_sample_rate(80);
device_id = get_device_id();
}
if (device_id == PS2MOUSE_INTELLIMOUSE_ID) {
@ -254,6 +264,19 @@ void PS2MouseDevice::initialize_device()
klog() << "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;
klog() << "PS2MouseDevice: 5 buttons enabled!";
}
enable_irq();
}

3
Kernel/Devices/PS2MouseDevice.h
View file

@ -68,12 +68,15 @@ private:
u8 wait_then_read(u8 port);
void parse_data_packet();
void expect_ack();
void set_sample_rate(u8);
u8 get_device_id();
bool m_device_present { false };
CircularQueue<MousePacket, 100> m_queue;
u8 m_data_state { 0 };
u8 m_data[4];
bool m_has_wheel { false };
bool m_has_five_buttons { false };
};
}

2
Kernel/MousePacket.h
View file

@ -37,6 +37,8 @@ struct MousePacket {
LeftButton = 0x01,
RightButton = 0x02,
MiddleButton = 0x04,
BackButton = 0x08,
ForwardButton = 0x10,
};
unsigned char buttons { 0 };