usf_post_boot.sh

#!/system/bin/sh
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dir0=/data/usf
pcm_ind_file=$dir0/pcm_inds.txt
pcm_file=/proc/asound/pcm

tx_rx_patterns=(tx2- rx2-)
dev_ids=("0" "0")
cards=("0" "0")
found_num=0

# Run usf_settings script
if [ -f /system/etc/usf_settings.sh ]; then
  source /system/etc/usf_settings.sh
fi

while read pcm_entry; do
    for i in 0 1; do
        echo $pcm_entry
        id="${pcm_entry##*"${tx_rx_patterns[$i]}"}"
        case "$pcm_entry" in
            "$id")
            ;;

            *)
            cards[$i]=${pcm_entry:0:2}
            dev_ids[$i]=${pcm_entry:3:2}
            found_num=$(( $found_num + 1))
            i=2
            ;;
        esac

        case $i in
            2)
            break
            ;;
        esac
    done

    case $found_num in
        2)
        break
        ;;
    esac

done < $pcm_file

echo ${dev_ids[0]}" "${dev_ids[1]}" "${cards[0]}" "${cards[1]}>$pcm_ind_file
chmod 0644 $pcm_ind_file

# Post-boot start of selected USF based calculators
for i in $(cat $dir0/auto_start.txt); do
   start $i
done