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Kernel: Add I8042Controller to detect and manage PS/2 devices

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Rework the PS/2 keyboard and mouse drivers to use a common 8042
controller driver. Also, reset and reconfigure the 8042 controller
as they are not guaranteed to be in the state that we expect.
This commit is contained in:
Tom 2020-11-07 12:09:28 -07:00 • committed by Andreas Kling
parent e1c27c16d8
commit 91db31880f
8 changed files with 617 additions and 261 deletions
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43
Kernel/Devices/PS2MouseDevice.h
View file

@ -29,20 +29,23 @@
#include <AK/CircularQueue.h>
#include <Kernel/API/MousePacket.h>
#include <Kernel/Devices/CharacterDevice.h>
#include <Kernel/Devices/I8042Controller.h>
#include <Kernel/Interrupts/IRQHandler.h>
#include <Kernel/Random.h>
namespace Kernel {
class PS2MouseDevice final : public IRQHandler
, public CharacterDevice {
, public CharacterDevice
, public I8042Device {
public:
PS2MouseDevice();
virtual ~PS2MouseDevice() override;
static void create();
static PS2MouseDevice& the();
bool initialize();
// ^CharacterDevice
virtual bool can_read(const FileDescription&, size_t) const override;
virtual KResultOr<size_t> read(FileDescription&, size_t, UserOrKernelBuffer&, size_t) override;
@ -51,6 +54,13 @@ public:
virtual const char* purpose() const override { return class_name(); }
// ^I8042Device
virtual void irq_handle_byte_read(u8 byte) override;
virtual void enable_interrupts() override
{
enable_irq();
}
private:
// ^IRQHandler
void handle_vmmouse_absolute_pointer();
@ -59,24 +69,25 @@ private:
// ^CharacterDevice
virtual const char* class_name() const override { return "PS2MouseDevice"; }
void initialize();
void check_device_presence();
void initialize_device();
void prepare_for_input();
void prepare_for_output();
void mouse_write(u8);
u8 mouse_read();
void wait_then_write(u8 port, u8 data);
u8 wait_then_read(u8 port);
void parse_data_packet();
void expect_ack();
struct RawPacket {
union {
u32 dword;
u8 bytes[4];
};
};
u8 read_from_device();
u8 send_command(u8 command);
u8 send_command(u8 command, u8 data);
MousePacket parse_data_packet(const RawPacket&);
void set_sample_rate(u8);
u8 get_device_id();
bool m_device_present { false };
CircularQueue<MousePacket, 100> m_queue;
I8042Controller& m_controller;
mutable SpinLock<u8> m_queue_lock;
CircularQueue<RawPacket, 100> m_queue;
u8 m_data_state { 0 };
u8 m_data[4];
RawPacket m_data;
bool m_has_wheel { false };
bool m_has_five_buttons { false };
EntropySource m_entropy_source;