Detach kernel driver before doing anything with device.

Initialization of the device must be done after device is detached from
kernel, otherwise exception will be thrown about device is busy message.

linak_ctrl.py

@@ -112,6 +112,10 @@ class LinakDevice:
         self._dev = usb.core.find(idVendor=LinakDevice.VEND,
                                   idProduct=LinakDevice.PROD)
 
+        # detach kernel driver, if attached
+        if self._dev.is_kernel_driver_active(0):
+            self._dev.detach_kernel_driver(0)
+
         # init device
         buf = [0 for _ in range(BUF_LEN)]
         buf[0] = MODE_OF_OPERATION          # 0x03 Feature report ID = 3
@@ -123,10 +127,6 @@ class LinakDevice:
         # hold a little bit, to make it effect.
         time.sleep(0.5)
 
-        # detach kernel driver, if attached
-        if self._dev.is_kernel_driver_active(0):
-            self._dev.detach_kernel_driver(0)
-
     def get_position(self, args):
         try:
             while True: