topology: add snd_tplg_version() function

Signed-off-by: Jaroslav Kysela <perex@perex.cz>

include/topology.h

@@ -775,6 +775,12 @@ enum snd_tplg_type {
 #define SND_TPLG_CREATE_VERBOSE		(1<<0)	/*!< Verbose output */
 #define SND_TPLG_CREATE_DAPM_NOSORT	(1<<1)	/*!< Do not sort DAPM objects by index */
 
+/**
+ * \brief Return the version of the topology library.
+ * \return A static string with the version number.
+ */
+const char *snd_tplg_version(void);
+
 /**
  * \brief Create a new topology parser instance.
  * \return New topology parser instance

src/topology/parser.c

@@ -503,3 +503,8 @@ void snd_tplg_free(snd_tplg_t *tplg)
 
 	free(tplg);
 }
+
+const char *snd_tplg_version(void)
+{
+	return SND_LIB_VERSION_STR;
+}