[bitbash] Add optional open() and close() methods for bit-bashing interfaces

Signed-off-by: Michael Brown <mcb30@ipxe.org>

1 files changed, 32 insertions, 0 deletions

diff --git a/src/include/ipxe/bitbash.h b/src/include/ipxe/bitbash.h
index 62b54b10f..69d5d9e3e 100644
--- a/src/include/ipxe/bitbash.h
+++ b/src/include/ipxe/bitbash.h
@@ -14,6 +14,18 @@ struct bit_basher;
 /** Bit-bashing operations */
 struct bit_basher_operations {
 	/**
+	 * Open bit-bashing interface (optional)
+	 *
+	 * @v basher		Bit-bashing interface
+	 */
+	void ( * open ) ( struct bit_basher *basher );
+	/**
+	 * Close bit-bashing interface (optional)
+	 *
+	 * @v basher		Bit-bashing interface
+	 */
+	void ( * close ) ( struct bit_basher *basher );
+	/**
 	 * Set/clear output bit
 	 *
 	 * @v basher		Bit-bashing interface
@@ -45,6 +57,26 @@ struct bit_basher {
 	struct bit_basher_operations *op;
 };
 
+/**
+ * Open bit-bashing interface
+ *
+ * @v basher		Bit-bashing interface
+ */
+static inline void open_bit ( struct bit_basher *basher ) {
+	if ( basher->op->open )
+		basher->op->open ( basher );
+}
+
+/**
+ * Close bit-bashing interface
+ *
+ * @v basher		Bit-bashing interface
+ */
+static inline void close_bit ( struct bit_basher *basher ) {
+	if ( basher->op->close )
+		basher->op->close ( basher );
+}
+
 extern void write_bit ( struct bit_basher *basher, unsigned int bit_id,
 			unsigned long data );
 extern int read_bit ( struct bit_basher *basher, unsigned int bit_id );