static ssize_t prochello_write( struct file *instanz, const char __user \
buffer, size_t max_bytes_to_write, loff_t *offset )
{
    ssize_t to_copy, not_copied;

    to_copy = min( max_bytes_to_write, sizeof(kernel_buffer) );

    not_copied = copy_from_user(kernel_buffer,buffer,to_copy);
    if (not_copied==0) {
        printk("kernel_buffer: \"%s\"\n", kernel_buffer);
        if (strncmp( "deutsch", kernel_buffer, 7)==0) {
            output_string = TEXT_GERMAN;
        }
        if (strncmp( "english", kernel_buffer, 7)==0) {
            output_string = TEXT_ENGLISH;
        }
    }
    return to_copy - not_copied;
}