1 files changed, 19 insertions, 0 deletions
diff --git a/fxstest.c b/fxstest.c
index f200c74..922a1a9 100755
--- a/fxstest.c
+++ b/fxstest.c
@@ -28,6 +28,7 @@ int main(int argc, char *argv[])
 		       "       stats - reports voltages\n"
 		       "       regdump - dumps ProSLIC registers\n"
 		       "       tones - plays a series of tones\n"
+		       "       polarity - tests polarity reversal\n"
 		       "       ring - rings phone\n");
 		exit(1);
 	}
@@ -46,6 +47,24 @@ int main(int argc, char *argv[])
 			fprintf(stderr, "Phone is ringing...\n");
 			sleep(2);
 		}
+	} else if (!strcasecmp(argv[2], "polarity")) {
+		fprintf(stderr, "Twiddling polarity...\n");
+		x = 0;
+		res = ioctl(fd, ZT_SETPOLARITY, &x);
+		if (res) {
+			fprintf(stderr, "Unable to polarity...\n");
+		} else {
+			fprintf(stderr, "Polarity is forward...\n");
+			sleep(2);
+			x = 1;
+			ioctl(fd, ZT_SETPOLARITY, &x);
+			fprintf(stderr, "Polarity is reversed...\n");
+			sleep(5);
+			x = 0;
+			ioctl(fd, ZT_SETPOLARITY, &x);
+			fprintf(stderr, "Polarity is forward...\n");
+			sleep(2);
+		}
 	} else if (!strcasecmp(argv[2], "tones")) {
 		int x = 0;
 		for (;;) {