parallel port problem

["taha siddiqi" <tawushafeez@xxxxxxxxx>]

Hi....
I am trying to read data from my laptop's (thinkpad R51) parallel port
(similar to the example in Linux Device Drivers 3rd Edition).
But, everytime i am reading the data it always comes to be 0xFF(255) ....
I even tried the following loop in my write function (struct file_operations)
while(count--){
   printk("writing %x\n", *ptr);
   out(*(ptr++), port);
   wmb();
   printk("reading data : %x\n", inb(port));
}
but the debug message in log shows something like
writing 116
reading 255
writing 78
reading 255
...
...

please help


thanks in advance
taha

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