SR_PRIV int sr_gpio_set_direction(unsigned gpio, unsigned direction);
SR_PRIV int sr_gpio_set_value(unsigned gpio, unsigned value);
SR_PRIV int sr_gpio_get_value(int gpio);
SR_PRIV int sr_gpio_set_direction(unsigned gpio, unsigned direction);
SR_PRIV int sr_gpio_set_value(unsigned gpio, unsigned value);
SR_PRIV int sr_gpio_get_value(int gpio);