diff --git a/wiringPi/wiringPi.c b/wiringPi/wiringPi.c
index 0d02b8a..c631dac 100644
--- a/wiringPi/wiringPi.c
+++ b/wiringPi/wiringPi.c
@@ -27,6 +27,7 @@
 #include <sys/wait.h>
 #include <sys/ioctl.h>
 #include <sys/utsname.h>
+#include <sys/types.h>
 #include <asm/ioctl.h>
 
 /*----------------------------------------------------------------------------*/
@@ -264,6 +265,29 @@ void setUsingGpiomem(const unsigned int value)
 	libwiring.usingGpiomem = value;
 }
 
+/*----------------------------------------------------------------------------*/
+/*
+ * input data to sys node.
+ */
+/*----------------------------------------------------------------------------*/
+int inputToSysNode (const char* sysPath, const char* node, char* data) {
+	char dest[(BLOCK_SIZE * 2)];
+	FILE *fd;
+
+	memset(dest, 0, sizeof(dest));
+
+	sprintf(dest, "%s/%s", sysPath, node);
+
+	if((fd = fopen(dest, "w")) == NULL) {
+		printf("Invalid sysnode path\n");
+		return -1;
+	}
+	fprintf(fd, "%s\n", data);
+	fclose(fd);
+
+	return 0;
+}
+
 /*----------------------------------------------------------------------------*/
 /*
  * setKernelVersion:
diff --git a/wiringPi/wiringPi.h b/wiringPi/wiringPi.h
index cb9fefb..bb8721c 100644
--- a/wiringPi/wiringPi.h
+++ b/wiringPi/wiringPi.h
@@ -342,6 +342,9 @@ extern unsigned int  digitalReadByte2	(void) UNU;
 extern		void digitalWriteByte	(int value) UNU;
 extern		void digitalWriteByte2	(int value) UNU;
 
+// sys node
+extern		int inputToSysNode	(const char* sysPath, const char* node, char* data);
+
 #ifdef __cplusplus
 }
 #endif