added spnav_cfg_reset, spnav_cfg_restore, and spnav_cfg_save.

proto.h

@@ -60,6 +60,7 @@ enum {
 	/* TODO ... more */
 	REQ_CFG_SAVE = 0x3ffe,	/* save config file:        R[6] status */
 	REQ_CFG_RESTORE,		/* load config from file:   R[6] status */
+	REQ_CFG_RESET,			/* reset to default config: R[6] status */
 
 	REQ_CHANGE_PROTO	= 0x5500
 };

spnav.c

@@ -789,6 +789,24 @@ int spnav_dev_type(void)
 	return rr.data[0];
 }
 
+int spnav_cfg_reset(void)
+{
+	struct reqresp rr = {0};
+	return request(REQ_CFG_RESET, &rr, TIMEOUT);
+}
+
+int spnav_cfg_restore(void)
+{
+	struct reqresp rr = {0};
+	return request(REQ_CFG_RESTORE, &rr, TIMEOUT);
+}
+
+int spnav_cfg_save(void)
+{
+	struct reqresp rr = {0};
+	return request(REQ_CFG_SAVE, &rr, TIMEOUT);
+}
+
 int spnav_cfg_set_sens(float s)
 {
 	struct reqresp rr = {0};

spnav.h

@@ -223,6 +223,21 @@ enum {
 	SPNAV_MAX_BNACT
 };
 
+/* Reset all settings to their default values. This change will not persist
+ * between spacenavd restarts, unless followed by a call to spnav_cfg_save.
+ */
+int spnav_cfg_reset(void);
+
+/* Revert all the session settings to the values defined in the spacenavd
+ * configuration file. This change will not persist between spacenavd restarts,
+ * unless followed by a call to spnav_cfg_save.
+ */
+int spnav_cfg_restore(void);
+
+/* Save all the current settings to the spacenavd configuration file. */
+int spnav_cfg_save(void);
+
+
 /* Set the global sensitivity.
  * cfgfile option: sensitivity
  */