From 7fd008992e8915175207b493788ba559d609b820 Mon Sep 17 00:00:00 2001
From: Chris <codewalker@hardkernel.com>
Date: Fri, 10 Feb 2023 16:56:38 +0900
Subject: [PATCH] ODROID-XU3/4: Fix wiringPiISR.

If a pin is exported, ISR does not work on XU4.
We will clear pin before using with wiringPiISR function.

Signed-off-by: Steve Jeong <how2soft@gmail.com>
Change-Id: Ibc747fe30fda20253eb77d9bbe5f6bcc8c2180b8
---
 wiringPi/wiringPi.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/wiringPi/wiringPi.c b/wiringPi/wiringPi.c
index 4d7b239..42e86ad 100644
--- a/wiringPi/wiringPi.c
+++ b/wiringPi/wiringPi.c
@@ -894,6 +894,14 @@ int wiringPiISR (int pin, int mode, void (*function)(void))
 	if (mode != INT_EDGE_SETUP) {
 		sprintf (pinS, "%d", GpioPin) ;
 
+		char temp[64];
+		sprintf(temp, "/sys/class/gpio/gpio%d", GpioPin);
+		if (access(temp, F_OK) == 0) {
+			FILE *unexport = fopen("/sys/class/gpio/unexport", "w");
+			fprintf (unexport, "%d\n", GpioPin);
+			fclose(unexport);
+		}
+
 		FILE *export, *direct, *edge;
 		int count;