//! The PS/2 Controller is located on the mainboard.
//! In the early days the controller was a single chip (Intel 8042).
//! As of today it is part of the Advanced Integrated Peripheral.
//!
//! It shows up in the device discovery as:
//! KBD_ [acpi_device] hid=PNP0303 (PS/2 Keyboard)
//!       - io_port 0x60 len 0x1
//!        - io_port 0x64 len 0x1
//!        - irq 0x1 len 0x1
//!  MOU_ [acpi_device] hid=PNP0F13 (PS/2 Mouse)
//!        - irq 0xc len 0x1
const std = @import("std");
const runtime = @import("runtime");
const ps2 = @import("root.zig");
const device = runtime.device;

pub fn main() void {
    const buffer = runtime.allocator().alloc(device.DeviceDescriptor, 64) catch {
        _ = runtime.system.write("system/drivers/ps2-bus: out of memory\n");
        return;
    };

    const keyboardDeviceDescriptor = device.findDeviceDescriptorByHid(buffer, "PNP0303");
    if (keyboardDeviceDescriptor != null) {
        // load keyboard driver
        _ = runtime.system.write("system/drivers/ps2-bus: found keyboard DeviceDescriptor\n");
        _ = runtime.system.write("system/drivers/ps2-bus: probing controller\n");

        if (!device.claim(keyboardDeviceDescriptor.?.id)) {
            _ = runtime.system.write("system/drivers/ps2-bus: unable to claim controller \n");
            return;
        }

        ps2.disablePorts(keyboardDeviceDescriptor.?);
        ps2.flushOutputBuffer(keyboardDeviceDescriptor.?);
    } else {
        _ = runtime.system.write("system/drivers/ps2-bus: no keyboard\n");
    }

    const mouseDeviceDescriptor = device.findDeviceDescriptorByHid(buffer, "PNP0F13");
    if (mouseDeviceDescriptor != null) {
        // load mouse driver
        _ = runtime.system.write("system/drivers/ps2-bus: found mouse DeviceDescriptor\n");
    } else {
        _ = runtime.system.write("system/drivers/ps2-bus: no mouse\n");
    }

    _ = runtime.system.write("system/drivers/ps2-bus: ok\n");
    while (true) runtime.system.sleep(1000);
}

pub const panic = runtime.panic;
comptime {
    _ = &runtime.start._start;
}