GPIO MPC8315 board

[Vasanth Ragavendran <ragavendrapec@yahoo.co.in>]

Hi
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I am using a MPC8315ERDB board. For this i've an external button which is
connected to GPIO pin 7 of the board. And if this button is pressed then
certain files have to be deleted. Browsing through the internet i found tha=
t
GPIO drivers have to be included into the kernel and hence i set a 'y' to
CONFIG_MPC8xxx_GPIO, CONFIG_GPIO_SYSFS and CONFIG_ARCH_WANT_OPTIONAL_GPIOLI=
B
etc. And the dts file has be modified to include the following lines=20
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gpio1: gpio-controller@c00 {               =20
#gpio-cells =3D <2>;               =20
compatible =3D "fsl,mpc8315-gpio", "fsl,mpc8349-gpio";               =20
reg =3D <0xc00 0x100>;               =20
interrupts =3D <74 0x8>;               =20
interrupt-parent =3D <&ipic>;               =20
gpio-controller;         };         =20
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this is included under immr@e0000000.
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further i included
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erase-button@0 {
compatible =3D "erase-button";
interrupts =3D <7 2>;
interrupt-parent =3D <&gpio1>;
};
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am i right in including this? coz after compiling the kernel i get a folder
under /sys/class/gpio. I did an export using
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echo 224 > /sys/class/gpio/export.
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224 was the number appearing in gpiochip224/base.
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It created another folder gpio224.
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However i'm not able to set the value in them nor the direction.
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echo 1 > /sys/class/gpio/gpio224/value
cat /sys/class/gpio/gpio224/value=EF=BB=BF
returns a value of 0 only.
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however the direction is "in"
cat /sys/class/gpio/gpio224/direction
in

Am i doing it correctly? How to check it programatically if the button is
pressed and take the corresponding action! Plz help!
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My kernel version is 2.6.35.9.
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Thanking you in advance.
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