//! PS/2 Keyboard Driver
//!
//! Spawned by the ps2-bus driver once the controller is initialized and port 1
//! has passed its interface test and device reset. The bus driver hands us our
//! device HID as argv[1]; we use it to locate our own device descriptor.

const std = @import("std");
const runtime = @import("runtime");
const ps2 = @import("ps2-library.zig");
const device = runtime.device;

fn writeLine(comptime fmt: []const u8, arguments: anytype) void {
    var line: [128]u8 = undefined;
    _ = runtime.system.write(std.fmt.bufPrint(&line, fmt, arguments) catch return);
}

pub fn main() void {
    const hid = runtime.argument(1);
    if (hid.len == 0) {
        _ = runtime.system.write("system/drivers/ps2-bus/keyboard: no HID argument\n");
        return;
    }
    writeLine("system/drivers/ps2-bus/keyboard: starting for hid {s}\n", .{hid});

    const buffer = runtime.allocator().alloc(device.DeviceDescriptor, 64) catch {
        _ = runtime.system.write("system/drivers/ps2-bus/keyboard: out of memory\n");
        return;
    };
    if (device.findDeviceDescriptorByHid(buffer, hid) == null) {
        writeLine("system/drivers/ps2-bus/keyboard: no device for hid {s}\n", .{hid});
        return;
    }

    // The 8042 ports (0x60/0x64) and this keyboard's IRQ1 both live on the same
    // PNP0303 node, which the ps2-bus driver exclusively owns — so the keyboard is
    // served through the bus and does not claim the controller itself.
    _ = runtime.system.write("system/drivers/ps2-bus/keyboard: served by ps2-bus (controller owned by bus)\n");

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

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