2009-09-13 04:33:59     simple GPIO driver BF537

2009-09-13 04:33:59     simple GPIO driver BF537

Yuval Yosef (ISRAEL)

Message: 79842   

I use Linux version 2.6.28.10-ADI-2009R1. First of all, Is it correct to use "simple gpio" driver in this version ?

I have some questions after testing behavior of simple-gpio-game.c program.

1. Return code of fflush() is EINVAL( = 22 -  invalid argument) . Is it affect on future actions ?

2. After exit the program by CTRL+C I see that leds LEDS2, LEDS3, LEDS4, lEDS5 stay 'turned off'.

3.  After some changes, adding close() function  and exit the program by ' return' leds LEDS2, LEDS3, LEDS4, lEDS5 stay 'turned off' also. But the leds according to    docs.blackfin.uclinux.org/doku.php?id=linux-kernel:drivers:simple-gpio&s[]=simple&s[]=gpio should be 'turned on' ?

Thanks for your help.

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2009-09-13 17:07:18     Re: simple GPIO driver BF537

Mike Frysinger (UNITED STATES)

Message: 79849   

using flush on the driver makes no sense

the documentation already tells you that released gpios are reset to the default state