65 lines
2.5 KiB
Zig
65 lines
2.5 KiB
Zig
//! PS/2 Mouse Driver
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//!
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//! Spawned by the ps2-bus driver once the controller is initialized and port 2
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//! has passed its interface test and device reset. The bus driver hands us our
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//! device HID as argv[1]; we use it to locate our own device descriptor.
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const std = @import("std");
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const runtime = @import("runtime");
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const ps2 = @import("ps2-library.zig");
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const device = runtime.device;
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fn writeLine(comptime fmt: []const u8, arguments: anytype) void {
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var line: [128]u8 = undefined;
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_ = runtime.system.write(std.fmt.bufPrint(&line, fmt, arguments) catch return);
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}
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pub fn main(init: runtime.process.Init) void {
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const hid = init.arguments.get(1).?;
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if (hid.len == 0) {
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_ = runtime.system.write("system/drivers/ps2-bus/mouse: no HID argument\n");
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return;
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}
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writeLine("system/drivers/ps2-bus/mouse: starting for hid {s}\n", .{hid});
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const buffer = runtime.allocator().alloc(device.DeviceDescriptor, 64) catch {
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_ = runtime.system.write("system/drivers/ps2-bus/mouse: out of memory\n");
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return;
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};
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const mouse_device_descriptor = device.findDeviceDescriptorByHid(buffer, hid) orelse {
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writeLine("system/drivers/ps2-bus/mouse: no device for hid {s}\n", .{hid});
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return;
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};
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// The mouse's own node (PNP0F13) carries IRQ12 and is not claimed by the bus,
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// so this driver takes exclusive ownership of it. Port IO still goes through
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// the bus, which owns the shared 8042 ports.
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if (!device.claim(mouse_device_descriptor.id)) {
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writeLine("system/drivers/ps2-bus/mouse: unable to claim device for hid {s}\n", .{hid});
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return;
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}
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writeLine("system/drivers/ps2-bus/mouse: claimed device for hid {s}\n", .{hid});
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// Broadcast mouse events through the input service so programs can listen for them
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// (docs/input.md). As with the keyboard, decoding real PS/2 mouse packets is a
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// follow-up; for now we publish the synthetic stand-in stream. The fan-out path is
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// real, only the source of the movement is placeholder.
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var source = runtime.input.connectSource() orelse {
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_ = runtime.system.write("system/drivers/ps2-bus/mouse: input service unavailable\n");
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return;
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};
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_ = runtime.system.write("system/drivers/ps2-bus/mouse: ok\n");
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var step: usize = 0;
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while (true) : (step +%= 1) {
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_ = source.publishMouseEvent(runtime.input.syntheticMouseEvent(step));
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runtime.system.sleep(200);
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}
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}
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pub const panic = runtime.panic;
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comptime {
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_ = &runtime.start._start;
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}
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