add SR_CONF_DATALOG

hwdriver.c

@@ -79,6 +79,8 @@ static struct sr_config_info sr_config_info_data[] = {
 		"Volts/div", NULL},
 	{SR_CONF_COUPLING, SR_T_CHAR, "coupling",
 		"Coupling", NULL},
+	{SR_CONF_DATALOG, SR_T_BOOL, "datalog",
+		"Datalog", NULL},
 	{0, 0, NULL, NULL, NULL},
 };
 

libsigrok.h

@@ -679,6 +679,10 @@ enum {
 	 * samples continuously, until explicitly stopped by a certain command.
 	 */
 	SR_CONF_CONTINUOUS,
+
+	/** The device has internal storage, into which data is logged. This
+	 * starts or stops the internal logging. */
+	SR_CONF_DATALOG,
 };
 
 struct sr_dev_inst {