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Date: Wed, 11 Aug 2010 19:49:40 +0530
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Subject: Re: How to use mpc8xxx_gpio.c device driver
From: Ravi Gupta <dceravigupta@gmail.com>
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Also, when I try to export a gpio in sysfs

echo 9 > /sys/class/gpio/export

It gives me an error in dmesg
gpio_request: gpio-9 (sysfs) status -22
export_store: status -22

Here is a look of sysfs on my machine

# ls /sys/class/gpio/ -la
drwxr-xr-x    4 root     root            0 Jan  1 00:00 .
drwxr-xr-x   24 root     root            0 Jan  1 00:00 ..
--w-------    1 root     root         4096 Jan  1 00:10 export
drwxr-xr-x    3 root     root            0 Jan  1 00:00 gpiochip192
drwxr-xr-x    3 root     root            0 Jan  1 00:00 gpiochip224
--w-------    1 root     root         4096 Jan  1 00:00 unexport

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Also, when I try to export a gpio in sysfs<br><br>echo 9 &gt; /sys/class/gp=
io/export<br><br>It gives me an error in dmesg<br>gpio_request: gpio-9 (sys=
fs) status -22<br>export_store: status -22<br><br>Here is a look of sysfs o=
n my machine<br>
<br># ls /sys/class/gpio/ -la<br>drwxr-xr-x=A0=A0=A0 4 root=A0=A0=A0=A0 roo=
t=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 0 Jan=A0 1 00:00 .<br>drwxr-xr-x=A0=A0 2=
4 root=A0=A0=A0=A0 root=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 0 Jan=A0 1 00:00 .=
.<br>--w-------=A0=A0=A0 1 root=A0=A0=A0=A0 root=A0=A0=A0=A0=A0=A0=A0=A0 40=
96 Jan=A0 1 00:10 export<br>
drwxr-xr-x=A0=A0=A0 3 root=A0=A0=A0=A0 root=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=
=A0 0 Jan=A0 1 00:00 gpiochip192<br>drwxr-xr-x=A0=A0=A0 3 root=A0=A0=A0=A0 =
root=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 0 Jan=A0 1 00:00 gpiochip224<br>--w--=
-----=A0=A0=A0 1 root=A0=A0=A0=A0 root=A0=A0=A0=A0=A0=A0=A0=A0 4096 Jan=A0 =
1 00:00 unexport<br><br><br>

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