refactor: move firmware workspace under firmware

firmware/libs/kaptan-drivers/src/icm42688/error.rs

@@ -0,0 +1,17 @@
+//! ICM-42688-P operation errors.
+
+use kaptan_log::KaptanError;
+
+/// ICM-42688-P operation failure.
+#[derive(Debug, Eq, PartialEq, KaptanError)]
+pub enum Error<BusError> {
+    /// The selected SPI route rejected a transfer submission.
+    Start(BusError),
+    /// The responding device does not identify as an ICM-42688-P.
+    UnexpectedIdentity(u8),
+    /// An acquisition request arrived before initialization completed or while
+    /// another transfer still owned the selected route.
+    NotReady,
+    /// The selected SPI route reported a terminal transfer fault.
+    TransferFault,
+}