I can move the cursor through touchpad. Which is working fine. But I can't select it by double click on the touchpad. Instead of that I can select it by pressing the left click button. Mine Asus x55ca series. I had no touch pad problem with Windows and ubtuntu. But working with freya. Mine touchpad is not ok. I have to press the button whenever I need to select anything. I means it's working partially. I can able to move the cursor. But can't select by tapping on it.
You need to enable the 'Tap to Click' option in Application > System Settings > Mouse & Trackpad
You can also enable Two Finger Scroll in the same applet
If you don't see Mouse & Trackpad, you can install it with
sudo apt install switchboard-plug-gcc-mouse
