Pass output logs from a program into a function and store the return code in a variable at the same

I have a shell script which has a function to Log statements. SomeProgram is another program which is run from my shell script and the logs from it are passed into the function LogToFile.

#!/bin/sh

LogToFile() {
    [[ ! -t 0 ]] && while read line; do echo "$line" >> $MY_LOG_FILE; done
    for arg; do echo "$arg" >> $MY_LOG_FILE; done
}

SomeProgram | LogToFile

Question:
All is good until here. But I have been trying to get the return code from SomeProgram and store it in a variable. How can I do that without loosing the functionality of logs from SomeProgram going into my LogToFile function. I tried the following options but in vain.

RETVAL=SomeProgram | LogToFile
RETVAL=(SomeProgram) | LogToFile
RETVAL=(SomeProgram | LogToFile)

Is it possible to pass the output of a program to a function parameter and collect the return value in another variable at the same time?