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BQ27542-G1: What is the FID?

Part Number: BQ27542-G1

Could you please help to find out the fid of BQ27542-G1? Currently it always failed when the program ran to add_slave().

Original thread link: e2echina.ti.com/.../158314

/**
 * struct w1_family - reference counted family structure.
 * @family_entry:    family linked list
 * @fid:        8 bit family identifier
 * @fops:        operations for this family
 * @refcnt:        reference counter
 */
struct w1_family
{
    struct list_head    family_entry;
    u8            fid;
    struct w1_family_ops    *fops;
    atomic_t        refcnt;
};