Update ADC test to handle Linux 4.1+ kernel

Author: pdp7

test/test_adc.py

@@ -1,8 +1,10 @@
+#debian@beaglebone:~/adafruit-beaglebone-io-python/test$ cat test_adc.py
 import pytest
 import os
-
+import platform
 import Adafruit_BBIO.ADC as ADC
 
+
 def teardown_module(module):
     pass
     #ADC.cleanup()
@@ -17,14 +19,20 @@ def test_read_raw_adc_no_setup(self):
             ADC.read_raw("P9_40")
 
     def test_setup_adc(self):
-        ADC.setup()
 
-        files = os.listdir('/sys/devices')
-        ocp = '/sys/devices/'+[s for s in files if s.startswith('ocp')][0]
-        files = os.listdir(ocp)
-        helper_path = ocp+'/'+[s for s in files if s.startswith('helper')][0]
+        ADC.setup()
 
-        assert os.path.exists(helper_path + "/AIN1")
+        kernel = platform.release()
+        if kernel >= '4.1.0':
+            test_path = "/sys/bus/iio/devices/iio:device0/in_voltage1_raw"
+        else:
+            files = os.listdir('/sys/devices')
+            ocp = '/sys/devices/'+[s for s in files if s.startswith('ocp')][0]
+            files = os.listdir(ocp)
+            helper_path = ocp+'/'+[s for s in files if s.startswith('helper')][0]
+            test_path = helper_path + "/AIN1"
+
+        assert os.path.exists(test_path);
         #ADC.cleanup()
 
     def test_read_adc(self):
@@ -50,4 +58,4 @@ def test_many_read_adc(self):
             start = time.time() 
             value = -1
             value = ADC.read("AIN1")
-            assert value != -1
+            assert value != -1