def GPIO_read(self):
        'Reads logic state on GPIO enabled slave-selects pins.'
        self.bus.write_byte_data(self.address, 0xF5, 0x0f)
        status = self.bus.read_byte(self.address)
        bits_values = dict([('SS0',status & 0x01 == 0x01),('SS1',status & 0x02 == 0x02),('SS2',status & 0x04 == 0x04),('SS3',status & 0x08 == 0x08)])
        return bits_values
Reads logic state on GPIO enabled slave-selects pins.