Improved sysfs file access code

lib/Gpio.php

@@ -23,6 +23,18 @@ use NoccyLabs\Gpio\Exception\HardwareException;
 
 class Gpio implements \ArrayAccess
 {
+    // Direction
+    const DIR_IN       = "in";
+    const DIR_OUT      = "out";
+    // Values
+    const VAL_HIGH     = 1;
+    const VAL_LOW      = 0;
+    // Edges
+    const EDGE_NONE    = "none";
+    const EDGE_RISING  = "rising";
+    const EDGE_FALLING = "faling";
+    const EDGE_BOTH    = "both";
+
     protected $gpio = array();
     
     /** @var NoccyLabs\Gpio\GpioMapperInterface */
@@ -51,7 +63,29 @@ class Gpio implements \ArrayAccess
             $pin->doInterrupt();
         
         }
+    }
     
+    public function getPinFromFd($fd)
+    {
+        foreach($this->fd_pins as $pinfd=>$pin) {
+            if ($pinfd == $fd) { return $pin; }
+        }
+        return false;
+    }
+    
+    protected $fd_gpio = array();
+    protected $fd_pins = array();
+    
+    public function enableInterrupt(GpioPin $pin, $fd)
+    {
+        $this->fd_gpio[] = $fd;
+        
+        $this->fd_pins[$fd] = $pin;
+        
+    }
+    
+    public function disableInterrupt(GpioPin $pin)
+    {
     }
     
     public function setMapper(GpioMapperInterface $mapper=null)
@@ -64,7 +98,7 @@ class Gpio implements \ArrayAccess
     {
         if ($this->mapper) { $index = $this->mapper->mapLogicalToGpioPin($index); }
         if (empty($this->gpio[$index])) {
-            $this->gpio[$index] = new GpioPin($index);
+            $this->gpio[$index] = new GpioPin($index, $this);
         }
         return $this->gpio[$index];
     }