grizmio's Patch to make Adafruit's ADC python libraries works with ubuntu xenial, kernel 4

Adafruit_BBIO.diff

diff --git a/source/c_adc.c b/source/c_adc.c
index e0c754c..5269407 100644
--- a/source/c_adc.c
+++ b/source/c_adc.c
@@ -30,29 +30,28 @@ SOFTWARE.
 #include "c_adc.h"
 #include "common.h"
 
-char adc_prefix_dir[40];
+char adc_prefix_dir[49];
 
 int adc_initialized = 0;
 
 int initialize_adc(void)
 {
-    char test_path[40];
+    char test_path[49];
     FILE *fh;
     if (adc_initialized) {
         return 1;
     }
 
-    if (load_device_tree("cape-bone-iio")) {
-        build_path("/sys/devices", "ocp.", ocp_dir, sizeof(ocp_dir));
-        build_path(ocp_dir, "helper.", adc_prefix_dir, sizeof(adc_prefix_dir));
-        strncat(adc_prefix_dir, "/AIN", sizeof(adc_prefix_dir));
-
+    if (load_device_tree("BB-ADC")) {
+        strncat(adc_prefix_dir, "/sys/bus/iio/devices/iio:device0/in_voltage", sizeof(adc_prefix_dir));
+        
         // Test that the directory has an AIN entry (found correct devicetree)
-        snprintf(test_path, sizeof(test_path), "%s%d", adc_prefix_dir, 0);
+        snprintf(test_path, sizeof(test_path), "%s%d_raw", adc_prefix_dir, 1);
         
         fh = fopen(test_path, "r");
 
         if (!fh) {
+            puts("wiiii");
             return 0; 
         }
         fclose(fh);
@@ -67,10 +66,10 @@ int initialize_adc(void)
 int read_value(unsigned int ain, float *value)
 {
     FILE * fh;
-    char ain_path[40];
+    char ain_path[49];
     int err, try_count=0;
     int read_successful;
-    snprintf(ain_path, sizeof(ain_path), "%s%d", adc_prefix_dir, ain);
+    snprintf(ain_path, sizeof(ain_path), "%s%d_raw", adc_prefix_dir, ain);
     
     read_successful = 0;
 
@@ -106,5 +105,5 @@ int adc_setup()
 
 void adc_cleanup(void)
 {
-    unload_device_tree("cape-bone-iio");
+    unload_device_tree("BB-ADC");
 }
diff --git a/source/common.c b/source/common.c
index 8911a9c..4b07e7c 100644
--- a/source/common.c
+++ b/source/common.c
@@ -361,12 +361,14 @@ int get_spi_bus_path_number(unsigned int spi)
 int load_device_tree(const char *name)
 {
     FILE *file = NULL;
-    char slots[40];
+    char slots[41];
     char line[256];
 
-    build_path("/sys/devices", "bone_capemgr", ctrl_dir, sizeof(ctrl_dir));
-    snprintf(slots, sizeof(slots), "%s/slots", ctrl_dir);
+    // build_path("/sys/devices/platform", "bone_capemgr", ctrl_dir, sizeof(ctrl_dir));
+    snprintf(ctrl_dir, sizeof(ctrl_dir), "/sys/devices/platform/bone_capemgr");
 
+    snprintf(slots, sizeof(slots), "%s/slots", ctrl_dir);
+    
     file = fopen(slots, "r+");
     if (!file) {
         PyErr_SetFromErrnoWithFilename(PyExc_IOError, slots);
@@ -394,11 +396,12 @@ int load_device_tree(const char *name)
 int unload_device_tree(const char *name)
 {
     FILE *file = NULL;
-    char slots[40];
+    char slots[41];
     char line[256];
     char *slot_line;
 
-    build_path("/sys/devices", "bone_capemgr", ctrl_dir, sizeof(ctrl_dir));
+    // build_path("/sys/devices/platform", "bone_capemgr", ctrl_dir, sizeof(ctrl_dir));
+    snprintf(ctrl_dir, sizeof(ctrl_dir), "/sys/devices/platform/bone_capemgr");
     snprintf(slots, sizeof(slots), "%s/slots", ctrl_dir);
 
     file = fopen(slots, "r+");
diff --git a/source/common.h b/source/common.h
index 2600b40..a9a2c88 100644
--- a/source/common.h
+++ b/source/common.h
@@ -39,8 +39,8 @@ SOFTWARE.
 int gpio_mode;
 int gpio_direction[120];
 
-char ctrl_dir[35];
-char ocp_dir[25];
+char ctrl_dir[43];
+char ocp_dir[33];
 
 int get_gpio_number(const char *key, unsigned int *gpio);
 int get_pwm_key(const char *input, char *key);

related to: adafruit/adafruit-beaglebone-io-python#80