IOEXP_BACKLIGHT_CONT
output_init_value &= ~IOEXP_BACKLIGHT_CONT;
output_init_value |= IOEXP_BACKLIGHT_CONT;
uint8_t contreg = ioexp_gpio_pin_get(sc, IOEXP_BACKLIGHT_CONT);
ioexp_gpio_pin_write(sc, IOEXP_BACKLIGHT_CONT,
ioexp_gpio_pin_write(sc, IOEXP_BACKLIGHT_CONT,