[64800.861809] 60530 => r
[64800.940539] -3790 => 2
[64800.940539] 60525 => m
[64800.973821] -3821 =>
[64800.973828] 60530 => r
[64801.005426] -3790 => 2
[64801.005426] 60525 => m
[64801.085798] -3790 => 2
[64801.085798] 60525 => m
[64801.173809] -3790 => 2
[64801.173816] 60525 => m
[64801.173820] -3816 => ▒
[64801.173822] 60527 => o


int kbd_notify(struct notifier_block *self, unsigned long stage, void *data)
{
        struct keyboard_notifier_param *param = data;

        int value = param->value - 0xf00;

        printk("%d => %c\n", value, value);