From b7dda9021fe58a8901e3d5c3febcd9eaa827fc88 Mon Sep 17 00:00:00 2001
From: Jon Trulson <jtrulson@ics.com>
Date: Wed, 9 Sep 2015 16:45:45 -0600
Subject: [PATCH] grovecollision: throw exception(s) on fatal errors

Signed-off-by: Jon Trulson <jtrulson@ics.com>
Signed-off-by: Mihai Tudor Panu <mihai.tudor.panu@intel.com>
---
 src/grovecollision/grovecollision.cxx | 11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)

diff --git a/src/grovecollision/grovecollision.cxx b/src/grovecollision/grovecollision.cxx
index ccc1fd4f..fd8aa9bd 100644
--- a/src/grovecollision/grovecollision.cxx
+++ b/src/grovecollision/grovecollision.cxx
@@ -22,13 +22,22 @@
  * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  */
 
+#include <string>
+#include <stdexcept>
+
 #include "grovecollision.h"
 
 using namespace upm;
 
 GroveCollision::GroveCollision(int pin)
 {
-    m_gpio = mraa_gpio_init(pin);
+    
+    if ( !(m_gpio = mraa_gpio_init(pin)) ) 
+      {
+        throw std::invalid_argument(std::string(__FUNCTION__) +
+                                    ": mraa_gpio_init() failed, invalid pin?");
+        return;
+      }
     mraa_gpio_dir(m_gpio, MRAA_GPIO_IN);
 }