diff options
Diffstat (limited to 'Kernel')
| -rw-r--r-- | Kernel/Devices/PS2MouseDevice.cpp | 62 | ||||
| -rw-r--r-- | Kernel/Devices/PS2MouseDevice.h | 3 |
2 files changed, 53 insertions, 12 deletions
diff --git a/Kernel/Devices/PS2MouseDevice.cpp b/Kernel/Devices/PS2MouseDevice.cpp index 26a2083280..2fa2822df0 100644 --- a/Kernel/Devices/PS2MouseDevice.cpp +++ b/Kernel/Devices/PS2MouseDevice.cpp @@ -10,8 +10,16 @@ #define I8042_MOUSE_BUFFER 0x20 #define I8042_KEYBOARD_BUFFER 0x00 +#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 @@ -128,23 +136,53 @@ u8 PS2MouseDevice::wait_then_read(u8 port) void PS2MouseDevice::initialize() { // Enable PS aux port - wait_then_write(0x64, 0xa8); + wait_then_write(I8042_STATUS, 0xa8); + + check_device_presence(); + + if (m_device_present) + initialize_device(); +} + +void PS2MouseDevice::check_device_presence() +{ + mouse_write(PS2MOUSE_REQUEST_SINGLE_PACKET); + u8 maybe_ack = mouse_read(); + if (maybe_ack == I8042_ACK) { + m_device_present = true; + kprintf("PS2MouseDevice: Device detected\n"); + + // the mouse will send a packet of data, since that's what we asked + // for. we don't care about the content. + mouse_read(); + mouse_read(); + mouse_read(); + } else { + m_device_present = false; + kprintf("PS2MouseDevice: Device not detected\n"); + } +} + +void PS2MouseDevice::initialize_device() +{ + if (!m_device_present) + return; // Enable interrupts - wait_then_write(0x64, 0x20); + wait_then_write(I8042_STATUS, 0x20); // Enable the PS/2 mouse IRQ (12). // NOTE: The keyboard uses IRQ 1 (and is enabled by bit 0 in this register). - u8 status = wait_then_read(0x60) | 2; - wait_then_write(0x64, 0x60); - wait_then_write(0x60, status); + u8 status = wait_then_read(I8042_BUFFER) | 2; + wait_then_write(I8042_STATUS, 0x60); + wait_then_write(I8042_BUFFER, status); // Set default settings. - mouse_write(0xf6); + mouse_write(PS2MOUSE_SET_DEFAULTS); expect_ack(); // Enable. - mouse_write(0xf4); + mouse_write(PS2MOUSE_ENABLE_PACKET_STREAMING); expect_ack(); mouse_write(PS2MOUSE_GET_DEVICE_ID); @@ -190,7 +228,7 @@ void PS2MouseDevice::expect_ack() void PS2MouseDevice::prepare_for_input() { for (;;) { - if (IO::in8(0x64) & 1) + if (IO::in8(I8042_STATUS) & 1) return; } } @@ -198,7 +236,7 @@ void PS2MouseDevice::prepare_for_input() void PS2MouseDevice::prepare_for_output() { for (;;) { - if (!(IO::in8(0x64) & 2)) + if (!(IO::in8(I8042_STATUS) & 2)) return; } } @@ -206,15 +244,15 @@ void PS2MouseDevice::prepare_for_output() void PS2MouseDevice::mouse_write(u8 data) { prepare_for_output(); - IO::out8(0x64, 0xd4); + IO::out8(I8042_STATUS, 0xd4); prepare_for_output(); - IO::out8(0x60, data); + IO::out8(I8042_BUFFER, data); } u8 PS2MouseDevice::mouse_read() { prepare_for_input(); - return IO::in8(0x60); + return IO::in8(I8042_BUFFER); } bool PS2MouseDevice::can_read(FileDescription&) const diff --git a/Kernel/Devices/PS2MouseDevice.h b/Kernel/Devices/PS2MouseDevice.h index 1a91f556a9..c16cb6eb67 100644 --- a/Kernel/Devices/PS2MouseDevice.h +++ b/Kernel/Devices/PS2MouseDevice.h @@ -27,6 +27,8 @@ private: 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); @@ -36,6 +38,7 @@ private: void parse_data_packet(); void expect_ack(); + bool m_device_present { false }; CircularQueue<MousePacket, 100> m_queue; u8 m_data_state { 0 }; u8 m_data[4]; |