FUSB_REG_MASKB
ret = fusb302_i2c_write(chip, FUSB_REG_MASKB, 0xFF);
fusb302_i2c_clear_bits(chip, FUSB_REG_MASKB, maskb_interrupts) :
fusb302_i2c_set_bits(chip, FUSB_REG_MASKB, maskb_interrupts);