feat(i2c): Add a Tray ID I2C stress and run it in Script A and B

tray_id_stress.sh writes 0xA5 and 0x5A to register 0x02 of device 0x70
on buses 34, 35, 38 and 39, reading each back and comparing. The two
patterns put every bit in both states. It prints one PASS / FAIL / ERROR
line per step and a per-bus Summary with a single RESULT line; exit 0 is
all PASS, 1 is any FAIL or I2C error, 2 is bad arguments. FAIL (wrong
value read) and ERROR (i2cset / i2cget failed) are counted apart.

The original value is read first and written back at the end, verified
by a read; -R skips that, -n N repeats the sequence. Buses, address,
register and patterns are editable at the top of the file.

Script A runs one pass after show_dmesg as the baseline. Script B runs
one pass in every soak round, before the sleep 60.

The script is called by path and needs the exec bit on the DUT.

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01UniUXkxgCG2Ty74advL8Pd

src/Script_ABC_Blanton/1_Blanton_Script_A.ttl

@@ -897,6 +897,10 @@ endif
 include "utils/setup_pmon.ttl"
 include "utils/show_dmesg.ttl"
 
+; ========== Tray ID Stress Test ==========
+wait prompt_sonic_root
+sendln "~/Blanton_Script/tray_id_stress.sh"
+
 ;include "utils/xxx.ttl"
 ;wait prompt_sonic_root
 ;flushrecv

src/Script_ABC_Blanton/2_Blanton_Script_B.ttl

@@ -186,6 +186,11 @@ while 1
     sendln "jobs"
     wait prompt_sonic_root
     sendln "systemctl is-active mlucas-amm"
+
+    ; ========== Tray ID Stress Test ==========
+    wait prompt_sonic_root
+    sendln "~/Blanton_Script/tray_id_stress.sh"
+    
     wait prompt_sonic_root
     sendln "sleep 60"
 endwhile

src/Script_ABC_Blanton/Blanton_Script/tray_id_stress.sh

@@ -0,0 +1,155 @@
+#!/bin/bash
+#==============================================================================
+# Author  : ETWen
+# Date    : 20261001
+# Purpose : Tray ID I2C stress - write a pattern to the Tray ID register on each
+#           bus, read it back and compare. Patterns 0xA5 and 0x5A exercise every
+#           bit in both states (1010_0101 / 0101_1010).
+# Usage   : ./tray_id_stress.sh [-n loops] [-R] [-h]
+#             -n N   repeat the whole sequence N times (default 1)
+#             -R     do NOT restore the original register value at the end
+#             -h     help
+#           Buses / address / register / patterns are set in the block below.
+#
+# Exit    : 0 = all PASS, 1 = any FAIL or I2C error, 2 = usage
+#
+# Version History:
+# V1.0.0     20261001    Initial Version
+#==============================================================================
+
+#------------------------------------------------------------------------------
+# Settings - edit here
+#------------------------------------------------------------------------------
+BUSES=(34 35 38 39)        # i2c buses, one Tray ID device each
+ADDR=0x70                  # device address
+REG=0x02                   # Tray ID register
+PATTERNS=(0xa5 0x5a)       # written in this order, each read back and compared
+RESTORE=1                  # 1 = write the original value back when done
+
+LOOPS=1
+
+usage() {
+    sed -n '/^# Usage/,/^# Exit/p' "$0" | sed 's/^# \{0,1\}//'
+}
+
+while getopts ":n:Rh" opt; do
+    case "$opt" in
+        n) LOOPS="$OPTARG" ;;
+        R) RESTORE=0 ;;
+        h) usage; exit 0 ;;
+        :) echo "ERROR: -$OPTARG needs a value" >&2; usage >&2; exit 2 ;;
+        \?) echo "ERROR: unknown option -$OPTARG" >&2; usage >&2; exit 2 ;;
+    esac
+done
+if ! [[ "$LOOPS" =~ ^[1-9][0-9]*$ ]]; then
+    echo "ERROR: -n must be a positive integer (got '$LOOPS')" >&2; exit 2
+fi
+for t in i2cset i2cget; do
+    command -v "$t" >/dev/null 2>&1 || { echo "ERROR: $t not found" >&2; exit 2; }
+done
+
+# Counters per bus
+declare -A N_PASS N_FAIL N_ERR ORIG
+for b in "${BUSES[@]}"; do N_PASS[$b]=0; N_FAIL[$b]=0; N_ERR[$b]=0; ORIG[$b]=""; done
+
+# Read one byte; prints the value (0xNN) on success, returns 1 on failure.
+rd() {
+    local out
+    out=$(i2cget -f -y "$1" "$ADDR" "$REG" 2>&1)
+    if [[ $? -ne 0 || ! "$out" =~ ^0x[0-9a-fA-F]{1,2}$ ]]; then
+        echo "$out"; return 1
+    fi
+    echo "$out"
+}
+
+TS() { date '+%Y-%m-%d %H:%M:%S'; }
+
+echo "=========================================================="
+echo " Tray ID I2C stress    $(TS)"
+echo " buses: ${BUSES[*]}   addr $ADDR   reg $REG"
+echo " patterns: ${PATTERNS[*]}   loops: $LOOPS   restore: $RESTORE"
+echo "=========================================================="
+
+#------------------------------------------------------------------------------
+# Original values (so they can be put back)
+#------------------------------------------------------------------------------
+for b in "${BUSES[@]}"; do
+    if v=$(rd "$b"); then
+        ORIG[$b]="$v"
+        printf "[bus %-2s %s reg %s] original value: %s\n" "$b" "$ADDR" "$REG" "$v"
+    else
+        printf "[bus %-2s %s reg %s] original value: READ ERROR (%s)\n" "$b" "$ADDR" "$REG" "$v"
+    fi
+done
+echo "----------------------------------------------------------"
+
+#------------------------------------------------------------------------------
+# Write / read-back
+#------------------------------------------------------------------------------
+for (( loop = 1; loop <= LOOPS; loop++ )); do
+    (( LOOPS > 1 )) && echo "--- loop $loop / $LOOPS ---"
+    for b in "${BUSES[@]}"; do
+        for p in "${PATTERNS[@]}"; do
+            tag=$(printf "[bus %-2s %s reg %s]" "$b" "$ADDR" "$REG")
+            if ! werr=$(i2cset -f -y "$b" "$ADDR" "$REG" "$p" 2>&1); then
+                N_ERR[$b]=$(( N_ERR[$b] + 1 ))
+                echo "$tag write $p -> WRITE ERROR (${werr:-no message})   ERROR"
+                continue
+            fi
+            if ! got=$(rd "$b"); then
+                N_ERR[$b]=$(( N_ERR[$b] + 1 ))
+                echo "$tag write $p -> READ ERROR (${got:-no message})   ERROR"
+                continue
+            fi
+            if (( got == p )); then
+                N_PASS[$b]=$(( N_PASS[$b] + 1 ))
+                echo "$tag write $p -> read $got   PASS"
+            else
+                N_FAIL[$b]=$(( N_FAIL[$b] + 1 ))
+                echo "$tag write $p -> read $got   FAIL"
+            fi
+        done
+    done
+done
+
+#------------------------------------------------------------------------------
+# Restore
+#------------------------------------------------------------------------------
+if (( RESTORE )); then
+    echo "----------------------------------------------------------"
+    for b in "${BUSES[@]}"; do
+        o=${ORIG[$b]}; v=""
+        if [[ -z "$o" ]]; then
+            printf "[bus %-2s] restore skipped: original value was not readable\n" "$b"
+            continue
+        fi
+        if i2cset -f -y "$b" "$ADDR" "$REG" "$o" >/dev/null 2>&1 && v=$(rd "$b") && (( v == o )); then
+            printf "[bus %-2s] restored %s\n" "$b" "$o"
+        else
+            printf "[bus %-2s] RESTORE FAILED: wanted %s, read %s\n" "$b" "$o" "${v:-?}"
+            N_ERR[$b]=$(( N_ERR[$b] + 1 ))
+        fi
+    done
+fi
+
+#------------------------------------------------------------------------------
+# Summary
+#------------------------------------------------------------------------------
+per_bus=$(( LOOPS * ${#PATTERNS[@]} ))
+tp=0; tf=0; te=0
+echo
+echo "=========================== Summary =========================="
+printf "%-6s %-6s %-6s %8s %6s %6s %6s   %s\n" "BUS" "ADDR" "REG" "CHECKS" "PASS" "FAIL" "ERROR" "RESULT"
+for b in "${BUSES[@]}"; do
+    p=${N_PASS[$b]}; f=${N_FAIL[$b]}; e=${N_ERR[$b]}
+    tp=$(( tp + p )); tf=$(( tf + f )); te=$(( te + e ))
+    r=PASS; (( f > 0 || e > 0 || p != per_bus )) && r=FAIL
+    printf "%-6s %-6s %-6s %8s %6s %6s %6s   %s\n" "$b" "$ADDR" "$REG" "$per_bus" "$p" "$f" "$e" "$r"
+done
+total=$(( per_bus * ${#BUSES[@]} ))
+overall=PASS; (( tf > 0 || te > 0 || tp != total )) && overall=FAIL
+printf "%-6s %-6s %-6s %8s %6s %6s %6s   %s\n" "TOTAL" "" "" "$total" "$tp" "$tf" "$te" "$overall"
+echo "=============================================================="
+echo "Tray ID stress RESULT: $overall   ($(TS))"
+
+[[ "$overall" == PASS ]] && exit 0 || exit 1