title: I2C Bitbanging in Raspberry pi
body: <p>We are using <code>raspberry pi</code> in one of our projects; in the same we want to use the i2c to interface touch screen. As i2c in pi shall not support clock stretching planning to use the i2c bit banging. I am following the procedure as given in the link;
  <a href="http://lwn.net/Articles/230571/" rel="nofollow">I2C-GPIO</a></p>
  
  <p>I am unable activate the <code>i2c</code> on <code>gpio</code>. I get the following error</p>
  
  <pre><code>i2c-gpio: probe of i2c-gpio.0 failed with error -22
  </code></pre>
  
  <p>Regards
  Suman</p>