From d78ad91635b4d24d09674e9706eff3a5f710396e Mon Sep 17 00:00:00 2001
From: Nicola Lunghi <nicola.lunghi@emutex.com>
Date: Thu, 7 Sep 2017 17:39:07 +0100
Subject: [PATCH] src/x86/up.c: Require kernel FPGA control

abort the loading of mraa if the up kernel module is not loaded

Signed-off-by: Nicola Lunghi <nicola.lunghi@emutex.com>
Signed-off-by: Brendan Le Foll <brendan.le.foll@intel.com>
---
 src/x86/up.c | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/src/x86/up.c b/src/x86/up.c
index 0617379..8152d51 100644
--- a/src/x86/up.c
+++ b/src/x86/up.c
@@ -223,7 +223,13 @@ mraa_up_board()
     b->adc_raw = 8;
     b->adc_supported = 8;
 
-    return b;
+    const char* pinctrl_path = "/sys/bus/platform/drivers/up-pinctrl";
+    int have_pinctrl = access(pinctrl_path, F_OK) != -1;
+    syslog(LOG_NOTICE, "up: kernel pinctrl driver %savailable", have_pinctrl ? "" : "un");
+
+    if (have_pinctrl)
+        return b;
+
 error:
     syslog(LOG_CRIT, "up: Platform failed to initialise");
     free(b);