title: Howto Write to the GPIO Pin of the CM108 Chip in Linux?
body: <p>The CM108 from C-Media has 4 GPIO pin that you can access via a hid interface.</p>
  
  <p>Using the generic write function in Windows I was able to write to the gpio pins.</p>
  
  <p>However I'm trying to do the same thing in Linux without success.</p>
  
  <p>The linux kernel detect the device as a hidraw device. </p>
  
  <p>Note: I was able to read from the device, just not write. (I've run the app as root just to make sure it wasn't a permission issue).</p>