From fbbc0de6fb576536e9b63a0c20452a64f1eb111c Mon Sep 17 00:00:00 2001
From: Jon Trulson <jtrulson@ics.com>
Date: Wed, 9 Sep 2015 12:06:39 -0600
Subject: [PATCH] ttp223: 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/ttp223/ttp223.cxx | 11 +++++++++--
 1 file changed, 9 insertions(+), 2 deletions(-)

diff --git a/src/ttp223/ttp223.cxx b/src/ttp223/ttp223.cxx
index a5928f18..307f6d3a 100644
--- a/src/ttp223/ttp223.cxx
+++ b/src/ttp223/ttp223.cxx
@@ -22,14 +22,21 @@
  * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  */
 
+#include <string>
+#include <stdexcept>
+
 #include "ttp223.h"
 
 using namespace upm;
 
 TTP223::TTP223(unsigned int pin) {
     // initialize gpio input
-    mraa_init();
-    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);
     m_name = "ttp223";
 }