feat(hid): recognise Lightspeed receiver 046d:c547 (G915, G502 X)

crates/openlogi-hid/src/route.rs

@@ -91,12 +91,14 @@ pub const BOLT_PIDS: &[u16] = &[0xc548];
 /// Unifying, so it routes as [`DeviceRoute::Unifying`].
 pub const UNIFYING_PIDS: &[u16] = &[0xc52b, 0xc532, 0xc539];
 
-/// USB product IDs that identify Logitech Lightspeed nano receivers — the
-/// receivers bundled with G-series wireless mice such as the G305. They speak
-/// the same HID++ 1.0 receiver register protocol as Unifying, so they are
-/// enumerated, routed, and paired through the Unifying code path; only the
-/// user-facing receiver name (see [`receiver_display_name`]) differs.
-pub const LIGHTSPEED_PIDS: &[u16] = &[0xc53f];
+/// USB product IDs that identify Logitech Lightspeed receivers — the
+/// receivers bundled with G-series wireless devices. `0xc53f` is the nano
+/// receiver of wireless mice such as the G305; `0xc547` ships with newer
+/// G-series devices such as the G915 keyboard and the G502 X LIGHTSPEED.
+/// They speak the same HID++ 1.0 receiver register protocol as Unifying, so
+/// they are enumerated, routed, and paired through the Unifying code path;
+/// only the user-facing receiver name (see [`receiver_display_name`]) differs.
+pub const LIGHTSPEED_PIDS: &[u16] = &[0xc53f, 0xc547];
 
 /// Whether `product_id` is a receiver that speaks the Unifying HID++ 1.0
 /// register protocol — a Unifying receiver proper, or a protocol-compatible
@@ -336,6 +338,7 @@ mod tests {
     #[test]
     fn lightspeed_receiver_has_its_own_display_name() {
         assert_eq!(receiver_display_name(0xc53f), "Lightspeed Receiver");
+        assert_eq!(receiver_display_name(0xc547), "Lightspeed Receiver");
         assert_eq!(receiver_display_name(0xc52b), "Unifying Receiver");
     }
 

crates/openlogi-hid/src/transport.rs

@@ -241,6 +241,7 @@ fn is_receiver_child_sysfs_path(path: &str) -> bool {
     crate::BOLT_PIDS
         .iter()
         .chain(crate::UNIFYING_PIDS.iter())
+        .chain(crate::LIGHTSPEED_PIDS.iter())
         .any(|&pid| {
             let marker = format!(":{LOGITECH_VID:04X}:{pid:04X}.");
             // A parent component contains the marker followed by at least one

crates/openlogi-hid/src/transport/tests.rs

@@ -85,6 +85,9 @@ const UNIFYING_RECEIVER: &str = "/sys/devices/pci0000:00/0000:00:14.0/usb3/3-5/3
 // Sysfs path: child of Bolt receiver
 const BOLT_CHILD: &str = "/sys/devices/pci0000:00/0000:00:14.0/usb3/3-5/\
      0003:046D:C548.0001/0003:046D:B037.0002";
+// Sysfs path: child of a Lightspeed receiver (a G915, wpid 407C, on c547)
+const LIGHTSPEED_CHILD: &str = "/sys/devices/pci0000:00/0000:00:14.0/usb3/3-5/\
+     0003:046D:C547.0003/0003:046D:407C.0004";
 // Sysfs path: unrelated non-Logitech device
 const UNRELATED: &str = "/sys/devices/pci0000:00/0000:00:15.0/i2c-0/0018:06CB:CE67.0001";
 
@@ -103,6 +106,11 @@ fn child_of_bolt_receiver_is_detected() {
     assert!(is_receiver_child_sysfs_path(BOLT_CHILD));
 }
 
+#[test]
+fn child_of_lightspeed_receiver_is_detected() {
+    assert!(is_receiver_child_sysfs_path(LIGHTSPEED_CHILD));
+}
+
 #[test]
 fn unrelated_device_is_not_a_child() {
     assert!(!is_receiver_child_sysfs_path(UNRELATED));

crates/openlogi-hidpp/src/receiver/unifying.rs

@@ -23,16 +23,20 @@ use crate::{
 /// receivers.
 ///
 /// `046d:c539` is the Lightspeed gaming receiver; `046d:c53f` is the Lightspeed
-/// nano receiver (bundled with G-series wireless mice such as the G305). Both
-/// answer the same HID++ 1.0 registers (pairing count, connection state, pairing
-/// information) as Unifying receivers. Callers that surface a user-facing
-/// receiver name label Lightspeed PIDs separately (see `openlogi-hid`).
-/// `0xc53f` was verified against a G305 (paired device wpid `0x4074`).
+/// nano receiver (bundled with G-series wireless mice such as the G305);
+/// `046d:c547` is the Lightspeed receiver bundled with newer G-series devices
+/// such as the G915 keyboard and the G502 X LIGHTSPEED. All answer the same
+/// HID++ 1.0 registers (pairing count, connection state, pairing information)
+/// as Unifying receivers. Callers that surface a user-facing receiver name
+/// label Lightspeed PIDs separately (see `openlogi-hid`).
+/// `0xc53f` was verified against a G305 (paired device wpid `0x4074`);
+/// `0xc547` against a G915 (paired device wpid `0x407c`).
 pub const VPID_PAIRS: &[(u16, u16)] = &[
     (0x046d, 0xc52b),
     (0x046d, 0xc532),
     (0x046d, 0xc539),
     (0x046d, 0xc53f),
+    (0x046d, 0xc547),
 ];
 
 /// All known registers of the Unifying receiver.