From 04e91db166cb2115f92762143758447583a41561 Mon Sep 17 00:00:00 2001
From: Jon Trulson <jtrulson@ics.com>
Date: Tue, 8 Sep 2015 12:45:33 -0600
Subject: [PATCH] grovespeaker: 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/grovespeaker/grovespeaker.cxx | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/src/grovespeaker/grovespeaker.cxx b/src/grovespeaker/grovespeaker.cxx
index 970ae7c5..0b34e487 100644
--- a/src/grovespeaker/grovespeaker.cxx
+++ b/src/grovespeaker/grovespeaker.cxx
@@ -23,6 +23,8 @@
  */
 
 #include <iostream>
+#include <string>
+#include <stdexcept>
 
 #include "grovespeaker.h"
 
@@ -30,7 +32,10 @@ using namespace upm;
 
 GroveSpeaker::GroveSpeaker(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?");
+
     mraa_gpio_dir(m_gpio, MRAA_GPIO_OUT);
 	m_note_list['a'] = storeNote(1136, 1073, 568, 536, 284, 268);
 	m_note_list['b'] = storeNote(1012, 0, 506, 0, 253, 0);