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reorg: move the USB client to library/device/usb (drop runtime.usb)

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The USB class-driver transfer client was library/runtime/usb.zig, re-exported
as runtime.usb — which compiled the USB client and usb-transfer-protocol into
every user binary (init, fat, the compositor…), none of which speak USB. It is
bus-family logic, not core runtime.

Move it to its domain home, library/device/usb/usb.zig (module "usb"), alongside
the usb-abi and usb-ids data modules; fix its internal imports to go through the
runtime module; and re-export usb.abi / usb.ids so a class driver reaches the
whole USB domain through one import. runtime.usb and runtime's
usb-transfer-protocol import are removed; the three class drivers
(usb-hid keyboard/mouse, usb-storage) import module "usb" directly.

zig build + test green; usb-hid, usb-storage pass.
This commit is contained in:
Daniel Samson
2026-07-22 20:46:51 +01:00
parent a7f0c1a450
commit 1d1234c963
6 changed files with 48 additions and 25 deletions
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system/drivers/usb-hid/mouse.zig
+6 -5
View File
@@ -3,7 +3,7 @@
//! Spawned by the device manager when the xHCI bus driver reports a HID / boot /
//! mouse interface (class 3, subclass 1, protocol 2); its assigned device id
//! arrives as argv[1]. Like the keyboard driver it owns no hardware: it opens its
//! device through the USB transfer protocol (`runtime.usb`), asks for the boot
//! device through the USB transfer protocol (`usb`), asks for the boot
//! protocol, subscribes to its interrupt-IN endpoint, and turns each 3- or 4-byte
//! boot report into input-protocol mouse events published to the input service.
//!
@@ -12,6 +12,7 @@
const std = @import("std");
const runtime = @import("runtime");
const usb = @import("usb");
const usb_abi = @import("usb-abi");
const hid = @import("hid-report.zig");
const ipc = runtime.ipc;
@@ -38,11 +39,11 @@ pub fn main(init: runtime.process.Init) void {
};
if (runtime.device_manager.hello(.device, device_id) == null) return;
var device = runtime.usb.open(device_id) orelse {
var device = usb.open(device_id) orelse {
std.log.info("could not open device {d}", .{device_id});
return;
};
const endpoint = device.findEndpoint(runtime.usb.transfer_type_interrupt, true) orelse {
const endpoint = device.findEndpoint(usb.transfer_type_interrupt, true) orelse {
_ = runtime.system.write("/system/drivers/usb-hid/mouse: no interrupt-IN endpoint\n");
return;
};
@@ -70,9 +71,9 @@ pub fn main(init: runtime.process.Init) void {
if (signals.has(.terminate)) return;
continue;
}
if (!got.isMessage() or got.len < @sizeOf(runtime.usb.InterruptReport)) continue;
if (!got.isMessage() or got.len < @sizeOf(usb.InterruptReport)) continue;
const message = std.mem.bytesToValue(runtime.usb.InterruptReport, receive[0..@sizeOf(runtime.usb.InterruptReport)]);
const message = std.mem.bytesToValue(usb.InterruptReport, receive[0..@sizeOf(usb.InterruptReport)]);
const length = @min(message.length, message.data.len);
const report = hid.parseMouse(message.data[0..length]) orelse continue;
const mask = buttonMask(report.buttons);