i8042_filter
filtered = i8042_filter(data, str, serio);
.i8042_filter = asus_i8042_filter,
if (asus->driver->i8042_filter) {
err = i8042_install_filter(asus->driver->i8042_filter, NULL);
if (asus->driver->i8042_filter)
i8042_remove_filter(asus->driver->i8042_filter);
i8042_filter_t i8042_filter;