BTN_MISC
bit_ffs(evdev->ev_key_flags, BTN_MISC, &res);
bit_count(evdev->ev_key_flags, BTN_MISC, KEY_OK - BTN_MISC, &res);
HCONS_MAP_KEY(0x036, BTN_MISC),
[0x036] = BTN_MISC,
has_keys = bit_find(key_bits, 0, BTN_MISC - 1);
has_buttons = bit_find(key_bits, BTN_MISC, BTN_JOYSTICK - 1);