Add bus access methods to ExclusiveDevice

Author: bugadani

embedded-hal-async/CHANGELOG.md

@@ -7,6 +7,9 @@ and this project adheres to [Semantic Versioning](http://semver.org/).
 
 ## [Unreleased]
 
+### Added
+- spi: added `ExclusiveDevice::{bus, bus_mut}`.
+
 ## [v0.2.0-alpha.2] - 2023-07-04
 
 ### Added

embedded-hal-async/src/spi.rs

@@ -208,6 +208,16 @@ impl<BUS, CS, D> ExclusiveDevice<BUS, CS, D> {
     pub fn new(bus: BUS, cs: CS, delay: D) -> Self {
         Self { bus, cs, delay }
     }
+
+    /// Returns a reference to the underlying bus object.
+    pub fn bus(&self) -> &BUS {
+        &self.bus
+    }
+
+    /// Returns a mutable reference to the underlying bus object.
+    pub fn bus_mut(&mut self) -> &mut BUS {
+        &mut self.bus
+    }
 }
 
 impl<BUS, CS, D> ErrorType for ExclusiveDevice<BUS, CS, D>