touchscreen gone, ne way to make USB storage instead of charge?

I really need a guru here with this one! Dropped the phone last tuesday, screen cracked, and is no longer operable. Since the Nexus 4 has no SD card, I have no way of retrieving the data on it. When I plug the usb cable into the computer, it defaults to charging mode instead of mass storage mode to mount a drive on the computer. Screen is locked with my chosen pattern. Is there any way at all to make the the phone automatically mount the drive instead of going to charging mode?