EmberJS. How use two way binding for input and focus event?

I'm trying to create custom input component. First of all I tried to use native input component. Somthing like this

<input type="text" value="" onblur= onfocus=>

But this code does't provide two way binding. The observer doesn't triggered

valueChanged: Ember.observer('inputValue', function () {
  // deal with the change
  this.set("valueSet",(this.get('inputValue').trim().length > 0));
}),

After this I have try use input helper

In this case valueChanged observer is triggered but focus event doesn't listening, otherwise the key-press is triggered.

How can I use two way binding and focus event at one time?