Implement override of enable_* functions

Author: harrisonmutai-arm

drivers/include/drivers/UnbufferedSerial.h

@@ -143,6 +143,35 @@ class UnbufferedSerial:
         return 0;
     }
 
+    /** Enable or disable input
+     *
+     * Control enabling of device for input. This is primarily intended
+     * for temporary power-saving; the overall ability of the device to operate
+     * for input and/or output may be fixed at creation time, but this call can
+     * allow input to be temporarily disabled to permit power saving without
+     * losing device state.
+     *
+     *  @param enabled      true to enable input, false to disable.
+     *
+     *  @return             0 on success
+     *  @return             Negative error code on failure
+     */
+    int enable_input(bool enabled) override;
+
+    /** Enable or disable output
+     *
+     * Control enabling of device for output. This is primarily intended
+     * for temporary power-saving; the overall ability of the device to operate
+     * for input and/or output may be fixed at creation time, but this call can
+     * allow output to be temporarily disabled to permit power saving without
+     * losing device state.
+     *
+     *  @param enabled      true to enable output, false to disable.
+     *
+     *  @return             0 on success
+     *  @return             Negative error code on failure
+     */
+    int enable_output(bool enabled) override;
 
     /** Check for poll event flags
      * Check the events listed in events to see if data can be read or written
@@ -157,8 +186,6 @@ class UnbufferedSerial:
 
     using SerialBase::attach;
     using SerialBase::baud;
-    using SerialBase::enable_input;
-    using SerialBase::enable_output;
     using SerialBase::format;
     using SerialBase::readable;
     using SerialBase::writeable;

drivers/source/UnbufferedSerial.cpp

@@ -99,6 +99,24 @@ short UnbufferedSerial::poll(short events) const
     return revents;
 }
 
+int UnbufferedSerial::enable_input(bool enabled)
+{
+    lock();
+    SerialBase::enable_input(enabled);
+    unlock();
+
+    return 0;
+}
+
+int UnbufferedSerial::enable_output(bool enabled)
+{
+    lock();
+    SerialBase::enable_output(enabled);
+    unlock();
+
+    return 0;
+}
+
 #if DEVICE_SERIAL_FC
 void UnbufferedSerial::set_flow_control(Flow type, PinName flow1, PinName flow2)
 {