bq2415x_sysfs_print_reg
ret += bq2415x_sysfs_print_reg(bq, BQ2415X_REG_STATUS, buf+ret);
ret += bq2415x_sysfs_print_reg(bq, BQ2415X_REG_CONTROL, buf+ret);
ret += bq2415x_sysfs_print_reg(bq, BQ2415X_REG_VOLTAGE, buf+ret);
ret += bq2415x_sysfs_print_reg(bq, BQ2415X_REG_VENDER, buf+ret);
ret += bq2415x_sysfs_print_reg(bq, BQ2415X_REG_CURRENT, buf+ret);