Provide userspace with a pollable sysfs entry that it can poll on waiting for touch event notifiction. Once it is woken up, the userspace can take action to change the power/performance characteristics of the device for the duration of the event. Change-Id: Iab84f729f2ea3a5352c4e5173f78544023a276c1 Signed-off-by: Amar Singhal <asinghal@codeaurora.org> (cherry picked from commit ac2a6d6453c50db7ba7c0b3aa328a3ba48a84abf)