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test-case: add new test case for check mic privacy
Add new test case to check hardware mic privacy mode enablement feature. For switching mic privacy state is using a USB relay. https://github.com/darrylb123/usbrelay Signed-off-by: Artur Wilczak <arturx.wilczak@intel.com>
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‎case-lib/relay.sh‎

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#!/bin/bash
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# SPDX-License-Identifier: BSD-3-Clause
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# Copyright(c) 2021-2025 Intel Corporation. All rights reserved.
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# needs usbrelay package: https://github.com/darrylb123/usbrelay
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# param1: --debug | switch name
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# param2: switch state
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usbrelay_switch()
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{
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if [[ "$1" == "--debug" ]]; then
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dlogi "Debug mode: Current status of all relays:"
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usbrelay || {
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die "Failed to get usbrelay status.
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The usbrelay hw module is not responding or no relays detected.
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Check hardware connection."
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}
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fi
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# Declare a constant for the relay settle time
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local USBRELAY_SETTLE_TIME=0.5
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local switch_name=$1
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local state=$2
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dlogi "Setting usbrelay switch $switch_name to $state."
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usbrelay "$switch_name=$state" --quiet || {
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die "Failed to set usbrelay switch $switch_name to $state.
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The usbrelay hw module is not responding or no relays detected.
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Check hardware connection."
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}
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# wait for the switch to settle
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sleep "$USBRELAY_SETTLE_TIME"
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# Display current state of the switch
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current_state=$(usbrelay | awk -F= -v name="$switch_name" '$1 == name { print $2 }')
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# Check if current_state is equal to the requested state
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[[ "$current_state" == "$state" ]] || {
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die "usbrelay switch $switch_name failed to set to $state (current: $current_state)"
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}
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case "$current_state" in
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'1') dlogi "Current state of $switch_name is: on";;
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'0') dlogi "Current state of $switch_name is: off";;
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*) die "Invalid state for $switch_name: $current_state";;
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esac
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}

‎env-check.sh‎

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func_check_pkg sox
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func_check_pkg tinycap
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func_check_pkg tinyplay
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# MIC privacy / JACK Audio detection relay switch
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func_check_pkg usbrelay
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# JACK Audio Connection Kit
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func_check_pkg jackd
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func_check_pkg jack_iodelay

‎test-case/test-mic-privacy.sh‎

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#!/bin/bash
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# SPDX-License-Identifier: BSD-3-Clause
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# Copyright(c) 2025 Intel Corporation. All rights reserved.
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##
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## Case Name: test-mic-privacy
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##
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## Preconditions:
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## HW managed mode (Only for DMIC PCH and SNDW interfaces).
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## This test case requires physical loopback between playback and capture.
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## playback <=====> capture
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## USB relay switch is connected. The usbrelay app is installed.
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## Instruction: https://github.com/darrylb123/usbrelay
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##
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## Description:
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## Run alsabat process perform both playback and capture.
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## Enable MIC privacy.
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## Run alsabat process perform both playback and capture again.
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##
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## Case step:
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## 1. Specify the pcm IDs for playback and capture
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## 2. Check if usbrelay is installed and connected properly.
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## 3. Run alsabat process perform both playback and capture.
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## 4. Switch relay 1 to enable MIC privacy.
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## 5. Run alsabat process perform both playback and capture.
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##
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## Expect result:
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## After step 3 the return value is 0.
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## After step 5 the return value is -1001 (no peak be detected).
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TESTDIR=$(realpath -e "$(dirname "${BASH_SOURCE[0]}")/..")
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TESTLIB="${TESTDIR}/case-lib"
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# shellcheck disable=SC1091 source=case-lib/lib.sh
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source "${TESTLIB}/lib.sh"
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# shellcheck disable=SC1091 source=case-lib/relay.sh
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source "${TESTLIB}/relay.sh"
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# remove the existing alsabat wav files
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ALSABAT_WAV_FILES="/tmp/mc.wav.*"
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rm -f "$ALSABAT_WAV_FILES"
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DSP_SETTLE_TIME=2
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OPT_NAME['p']='pcm_p' OPT_DESC['p']='pcm for playback. Example: hw:0,0'
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OPT_HAS_ARG['p']=1 OPT_VAL['p']='hw:0,0'
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OPT_NAME['N']='channel_p' OPT_DESC['N']='channel number for playback.'
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OPT_HAS_ARG['N']=1 OPT_VAL['N']='2'
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OPT_NAME['c']='pcm_c' OPT_DESC['c']='pcm for capture. Example: hw:0,1'
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OPT_HAS_ARG['c']=1 OPT_VAL['c']='hw:0,1'
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OPT_NAME['C']='channel_c' OPT_DESC['C']='channel number for capture.'
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OPT_HAS_ARG['C']=1 OPT_VAL['C']='2'
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OPT_NAME['s']='sof-logger' OPT_DESC['s']="Open sof-logger trace the data will store at $LOG_ROOT"
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OPT_HAS_ARG['s']=0 OPT_VAL['s']=1
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OPT_NAME['r']='rate' OPT_DESC['r']='sample rate'
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OPT_HAS_ARG['r']=1 OPT_VAL['r']=48000
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OPT_NAME['u']='relay' OPT_DESC['u']='name of usbrelay switch, default value is HURTM_1'
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OPT_HAS_ARG['u']=1 OPT_VAL['u']='HURTM_1'
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func_opt_parse_option "$@"
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pcm_p=${OPT_VAL['p']}
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pcm_c=${OPT_VAL['c']}
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channel_c=${OPT_VAL['C']}
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channel_p=${OPT_VAL['N']}
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rate=${OPT_VAL['r']}
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relay=${OPT_VAL['u']}
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dlogi "Params: pcm_p=$pcm_p, pcm_c=$pcm_c, channel_c=$channel_c, channel_p=$channel_p, rate=$rate, LOG_ROOT=$LOG_ROOT"
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__upload_wav_files()
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{
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# upload the alsabat wav file
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for file in $ALSABAT_WAV_FILES; do
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# alsabat has a bug where it creates an empty record in playback mode
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if test -s "$file"; then
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cp -v "$file" "$LOG_ROOT/"
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fi
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done
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}
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check_playback_capture()
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{
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# check if capture and playback work
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dlogc "alsabat -P$pcm_p -C$pcm_c -c 2 -r $rate"
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alsabat -P"$pcm_p" -C"$pcm_c" -c 2 -r "$rate" || {
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# upload failed wav file
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__upload_wav_files
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die "check_playback_capture() failed - check if a loopback is connected."
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}
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}
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handle_alsabat_result()
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{
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case "$alsabat_status" in
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23)
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# alsabat returns 23 if no peak detected (expected for MIC privacy)
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if grep -q -e "Amplitude: 0.0; Percentage: \[0\]" -e "Return value is -1001" "$alsabat_output"; then
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dlogi "Alsabat output indicates zero signal as expected (MIC privacy works)."
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else
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dloge "alsabat failed with status $alsabat_status, but signal is not zero."
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__upload_wav_files
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die "alsabat failed with: $(cat "$alsabat_output")."
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fi
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;;
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0)
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dloge "The alsabat command was unexpectedly successful."
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__upload_wav_files
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die "MIC privacy doesn't work. alsabat output: $(cat "$alsabat_output")"
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;;
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*)
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dloge "The alsabat command failed with unexpected status $alsabat_status."
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__upload_wav_files
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die "alsabat failed with: $(cat "$alsabat_output")."
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;;
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esac
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}
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show_control_state()
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{
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dlogi "Current state of the mic privacy control:"
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amixer -c 0 contents | awk '
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/^numid=/ {
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n=$0
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show = tolower($0) ~ /capture/
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found = 0
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}
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/type=BOOLEAN/ {
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t = $0
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if (show) found = 1
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}
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/: values=/ && found {
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print n
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print t
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print $0
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found = 0
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}'
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}
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main()
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{
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setup_kernel_check_point
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start_test
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logger_disabled || func_lib_start_log_collect
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if [ -z "$pcm_p" ] || [ -z "$pcm_c" ]; then
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skip_test "No playback or capture PCM is specified. Skip the $0 test."
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fi
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# check if usbrelay tool is installed
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command -v usbrelay || {
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skip_test "usbrelay command not found. Please install usbrelay to control the mic privacy switch."
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}
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dlogi "Current DSP status is $(sof-dump-status.py --dsp_status 0)" || {
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skip_test "platform doesn't support runtime pm, skip test case"
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}
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dlogi "Starting preconditions check"
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# display current status of relays
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usbrelay "--debug"
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check_locale_for_alsabat
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set_alsa
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dlogi "Reset - Turn off the mic privacy"
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usbrelay_switch "$relay" 0
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show_control_state
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# wait for the switch to settle
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sleep "$DSP_SETTLE_TIME"
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# check the PCMs before mic privacy test
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dlogi "Check playback/capture before mic privacy test"
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check_playback_capture
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# select the first card
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first_card_name=$(aplay -l | awk '/^card ([0-9]+)/ {print $3; exit}')
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# dump amixer contents always.
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# good case amixer settings is for reference, bad case for debugging.
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amixer -c "${first_card_name}" contents > "$LOG_ROOT"/amixer_settings.txt
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check_playback_capture
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dlogi "Preconditions are met, starting mic privacy test"
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sleep "$DSP_SETTLE_TIME"
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dlogi "===== Testing: MIC privacy ====="
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dlogi "Turn on the mic privacy switch"
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usbrelay_switch "$relay" 1
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# wait for the switch to settle
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sleep "$DSP_SETTLE_TIME"
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alsabat_output=$(mktemp)
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dlogc "alsabat -P$pcm_p -C$pcm_c -c 2 -r $rate"
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# run alsabat and capture both output and exit status
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alsabat_status=0
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alsabat -P"$pcm_p" -C"$pcm_c" -c 2 -r "$rate" > "$alsabat_output" 2>&1 || {
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alsabat_status=$?
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}
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handle_alsabat_result
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dlogi "Turn off the mic privacy switch."
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usbrelay_switch "$relay" 0
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check_playback_capture
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sof-kernel-log-check.sh "$KERNEL_CHECKPOINT"
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dlogi "===== Test completed successfully. ====="
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rm -rf "$alsabat_output"
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}
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{
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main "$@"; exit "$?"
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}

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