Update: Refine Qualcomm HWRNG test script and docs

Revised script and documentation following review suggestions.

Signed-off-by: Naveenkumar Suresh <[email protected]>

Author: nklazy

Runner/suites/Kernel/FunctionalArea/baseport/qcom_hwrng/README_qcom_hwrng.md

@@ -17,15 +17,15 @@ Ensure the following components are present in the target:
 - `rngtest` (Binary Available in /usr/bin) - this test app can be compiled from https://github.com/cernekee/rng-tools/
 
 ## Directory Structure
-
+```
 Runner/
 ├── suites/
 │   ├── Kernel/
 │   │   ├── FunctionalArea/
 │   │   │   ├── baseport/
 │   │   │   │   ├── qcom_hwrng/
 │   │   │   │   │   ├── run.sh
-
+```
 ## Usage
 
 1. Copy repo to Target Device: Use scp to transfer the scripts from the host to the target device. The scripts should be copied to the /var directory on the target device.
@@ -42,7 +42,7 @@ cd <this-repo>
 scp -r common Runner user@target_device_ip:/var
 ssh user@target_device_ip 
 cd /var/Runner && ./run-test.sh qcom_hwrng
-```
+
 Sample output:
 sh-5.2# ./run-test.sh qcom_hwrng
 [Executing test case: /var/Runner/suites/Kernel/FunctionalArea/baseport/qcom_hwrng] 2025-05-16 06:08:41 -
@@ -54,7 +54,7 @@ sh-5.2# ./run-test.sh qcom_hwrng
 cat: write error: Broken pipe
 [PASS] 2025-05-16 06:08:41 - qcom_hwrng : Test Passed
 [INFO] 2025-05-16 06:08:41 - -------------------Completed qcom_hwrng Testcase----------------------------
-
+```
 4. Results will be available in the `/var/Runner/suites/Kernel/FunctionalArea/baseport/qcom_hwrng/` directory.
 
 ## Notes

Runner/suites/Kernel/FunctionalArea/baseport/qcom_hwrng/run.sh

@@ -1,24 +1,31 @@
+#!/bin/sh
 # Copyright (c) Qualcomm Technologies, Inc. and/or its subsidiaries.
 # SPDX-License-Identifier: BSD-3-Clause-Clear
 
-#!/bin/sh
 # Import test suite definitions
-. $(pwd)/init_env
+. "${PWD}"/init_env
 TESTNAME="qcom_hwrng"
 
 #import test functions library
-. $TOOLS/functestlib.sh
+. "${TOOLS}"/functestlib.sh
 test_path=$(find_test_case_by_name "$TESTNAME")
 log_info "-----------------------------------------------------------------------------------------"
 log_info "-------------------Starting $TESTNAME Testcase----------------------------"
 
 # Set the hardware RNG source to Qualcomm's RNG
-echo qcom_hwrng > /sys/class/misc/hw_random/rng_current
+if [ -e /sys/class/misc/hw_random/rng_current ]; then
+    echo qcom_hwrng > /sys/class/misc/hw_random/rng_current
+else
+    echo "Path /sys/class/misc/hw_random/rng_current does not exist."
+    log_fail "$TESTNAME : Test Failed"
+    exit 1
+fi
 
 # Verify that qcom_hwrng was successfully set
 current_rng=$(cat /sys/class/misc/hw_random/rng_current)
 if [ "$current_rng" != "qcom_hwrng" ]; then
     log_info "Error: Failed to set qcom_hwrng as the current RNG source."
+    log_fail "$TESTNAME : Test Failed"
     exit 1
 else
     log_info "qcom_hwrng successfully set as the current RNG source."
@@ -37,7 +44,7 @@ if [ "$value" -lt 10 ]; then
     log_pass "$TESTNAME : Test Passed"
     echo "$TESTNAME PASS" > $test_path/$TESTNAME.res
 else
-	log_fail "$TESTNAME : Test Failed"
-	echo "$TESTNAME FAIL" > $test_path/$TESTNAME.res
+    log_fail "$TESTNAME : Test Failed"
+    echo "$TESTNAME FAIL" > $test_path/$TESTNAME.res
 fi
 log_info "-------------------Completed $TESTNAME Testcase----------------------------"