IT87_REG_CONFIG
config = it87_read_value(data, IT87_REG_CONFIG);
it87_write_value(data, IT87_REG_CONFIG, config);
it87_write_value(data, IT87_REG_CONFIG,
(it87_read_value(data, IT87_REG_CONFIG) & 0x3e)
if ((it87_read_value(data, IT87_REG_CONFIG) & 0x80) ||
it87_write_value(data, IT87_REG_CONFIG,
it87_read_value(data, IT87_REG_CONFIG) | 0x40);