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import RPi.GPIO as GPIO

def are_all_gpios_in_use():
    GPIO.setmode(GPIO.BCM)  # Set pin numbering to Broadcom scheme
    all_pins_in_use = True
    for channel in range(2, 28):  # GPIO pins typically range from 2 to 27 on Raspberry Pi
        try:
            function = GPIO.gpio_function(channel)
            if function != GPIO.IN and function != GPIO.OUT:
                all_pins_in_use = False
                break
        except ValueError:
            # GPIO channel is invalid
            continue
    return all_pins_in_use

if __name__ == "__main__":
    all_pins_in_use = are_all_gpios_in_use()
    if all_pins_in_use:
        print("All GPIO pins are in use.")
    else:
        print("Not all GPIO pins are in use.")