> > +static int ad485x_get_calibbias(struct ad485x_state *st, int ch, int *val,
> > + int *val2)
> > +{
> > + unsigned int lsb, mid, msb;
> > + int ret;
> > +
> > + guard(mutex)(&st->lock);
> > +
> > + ret = regmap_read(st->regmap, AD485X_REG_CHX_OFFSET_MSB(ch),
> > + &msb);
> > + if (ret)
> > + return ret;
> > +
> > + ret = regmap_read(st->regmap, AD485X_REG_CHX_OFFSET_MID(ch),
> > + &mid);
> > + if (ret)
> > + return ret;
> > +
> > + ret = regmap_read(st->regmap, AD485X_REG_CHX_OFFSET_LSB(ch),
> > + &lsb);
> > + if (ret)
> > + return ret;
> > +
> > + if (st->info->resolution == 16) {
> > + *val = msb << 8;
> > + *val |= mid;
> > + *val = sign_extend32(*val, 15);
> > + } else {
> > + *val = msb << 12;
> > + *val |= mid << 4;
> > + *val |= lsb >> 4;
> As below I'd use a byte array then you can do get_unaligned_be24 to
> + a right shift by 4 of the whole thing.
Regarding the bulk writes/reads, the msb/mid/lsb registers need to be read/write in a
specific order and the addresses are not incremental, so I am not sure how the bulk
functions fit. On this matter, we will need unsigned int (not u8) to store the values read via
regmap_read, and in this case we will need extra casts and assignments to use get_unaligned.
>
> > + *val = sign_extend32(*val, 19);
> > + }
> > +
> > + return IIO_VAL_INT;
> > +}
...
