IT87_REG_TEMP_EXTRA
extra = it87_read_value(data, IT87_REG_TEMP_EXTRA);
extra = it87_read_value(data, IT87_REG_TEMP_EXTRA);
it87_write_value(data, IT87_REG_TEMP_EXTRA, data->extra);
data->extra = it87_read_value(data, IT87_REG_TEMP_EXTRA) & 0x8f;
it87_write_value(data, IT87_REG_TEMP_EXTRA, data->extra);
!(it87_read_value(data, IT87_REG_TEMP_EXTRA) & 0x80))
data->extra = it87_read_value(data, IT87_REG_TEMP_EXTRA);