From 350e0f783db89e3def61ea6a4323def561f62cf7 Mon Sep 17 00:00:00 2001
From: Boss Marco <bossm8@students.bfh.ch>
Date: Fri, 27 Dec 2019 12:56:35 +0100
Subject: unexport gpio

---
 src/main.c | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/src/main.c b/src/main.c
index 9ffabce..d7ab48b 100644
--- a/src/main.c
+++ b/src/main.c
@@ -937,6 +937,19 @@ shutdown_task (void *cls)
       close (qrDisplay.backlightfd);
     qrDisplay.backlightfd = -1;
   }
+  if (0 > cancelButton.cancelbuttonfd)
+  {
+    close (cancelButton.cancelbuttonfd);
+    cancelButton.cancelbuttonfd = open ("/sys/class/gpio/unexport",
+                                        O_WRONLY);
+    if (0 > cancelButton.cancelbuttonfd)
+    {
+      GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
+                  "Unable to open /gpio/unexport for cancel button\n");
+    }
+    (void) write (cancelButton.cancelbuttonfd, "17", 2);
+    close (cancelButton.cancelbuttonfd);
+  }
   /* free the allocated productes read from config file */
   if (NULL != products)
   {
-- 
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