Hi,

Yes, 0 is not allowed for device number. It's used for dynamic allowance device number by (devfs_)registered_chrdev.
But you're right because your module never send 0 for device number ;)

Can you add device number parameter to your module.
Look at how I made for my project : http://www.shirka.org/cgi-bin/viewcvs.cgi/recycled/kernel/Linux/2.4/ioctl.c.diff?r1=1.9&r2=1.10

Bye.

Hi John,

I think that there is a minor bug in the function dazukoRegister_TS here :
   temp_id->dev_major = atoi(buffer);
-> if (temp_id->dev_major < 0)

If you run this test following :
#include <stdlib.h>

int main(void)
{
        int dev = -1;

        dev = atoi("bad number");
        printf("dev=%d\n", dev);
}

result : dev=0
atoi don't return error, but if it does not translate any digit, it returns 0.

I think then :
- if (temp_id->dev_major < 0)
+ if (temp_id->dev_major <= 0)

or use strol function.

Best regards.