bq27xxx_write
ret = bq27xxx_write(di, BQ27XXX_REG_CTRL, BQ27XXX_SEALED, false);
ret = bq27xxx_write(di, BQ27XXX_REG_CTRL, (u16)(di->unseal_key >> 16), false);
ret = bq27xxx_write(di, BQ27XXX_REG_CTRL, (u16)di->unseal_key, false);
ret = bq27xxx_write(di, BQ27XXX_DM_CLASS, buf->class, true);
ret = bq27xxx_write(di, BQ27XXX_DM_BLOCK, buf->block, true);
ret = bq27xxx_write(di, BQ27XXX_REG_CTRL, cmd, false);
ret = bq27xxx_write(di, BQ27XXX_DM_CTRL, 0, true);
ret = bq27xxx_write(di, BQ27XXX_DM_CLASS, buf->class, true);
ret = bq27xxx_write(di, BQ27XXX_DM_BLOCK, buf->block, true);
ret = bq27xxx_write(di, BQ27XXX_DM_CKSUM,
bq27xxx_write(di, BQ27XXX_REG_CTRL, BQ27XXX_RESET, false);