Many thanks for your help. I will try it.

2009/9/23 Peter Korsgaard <jac...@sunsite.dk>:
>>>>>> "Johnny" == Johnny Hung <johnny.hack...@gmail.com> writes:
>
>  Johnny> Thanks, got it. BTW, how to trigger GPIO level in user space
>  Johnny> application? I also found
>  Johnny> arch/powerpc/platforms/52xx/mpc52xx_gpio.c is a good
>  Johnny> example. Any reply is appreciate.
>
> Through sysfs. See 'Sysfs Interface for Userspace' section of
> Documentation/gpio.txt
>
> --
> Bye, Peter Korsgaard
>
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