How to reduce the cpu usage of touch driver ?

Discussion created by Zenger1978 on Jul 3, 2012

My project based on imx535+wince7.PMIC is DA9053. Now i use touch panel throught DA9053. But when i put down a little times (about 3 Secs ) on panel , the cpu idle is less than 20 percent ,there are no other program at the same time . why the touch panel driver spend so much cpu resource?