volume-basic-test.sh: switch to .tplg parsing to test topologies v2

Until now this test was "screen-scraping" amixer output. This was not
compatible with v2 topologies which means the test was always SKIP for
everything developped on the main branch. Switch to parsing topologies
to extract volume kcontrols.

Fixes: #1069, see also discussion in earlier attempt #1068.

Signed-off-by: Marc Herbert <marc.herbert@intel.com>

Author: marc-hb

test-case/volume-basic-test.sh

@@ -16,7 +16,9 @@
 
 # source from the relative path of current folder
 # shellcheck source=case-lib/lib.sh
-source "$(dirname "${BASH_SOURCE[0]}")"/../case-lib/lib.sh
+TOPDIR=$(cd "$(dirname "${BASH_SOURCE[0]}")"/.. && pwd)
+source "$TOPDIR/case-lib/lib.sh"
+
 
 volume_array=("0%" "10%" "20%" "30%" "40%" "50%" "60%" "70%" "80%" "90%" "100%")
 OPT_NAME['t']='tplg'     OPT_DESC['t']="tplg file, default value is env TPLG: $TPLG"
@@ -62,7 +64,10 @@ sleep 1
 [[ ! $(pidof aplay) ]] && die "aplay process is terminated too early"
 
 sofcard=${SOFCARD:-0}
-readarray -t pgalist < <(amixer -c"$sofcard" controls | awk -Fname= 'toupper($2) ~ /PGA/ { print $2 }')
+
+# https://mywiki.wooledge.org/BashFAQ/024 why cant I pipe data to read?
+readarray -t pgalist < <("$TOPDIR"/tools/topo_vol_kcontrols.py "$tplg")
+
 # This (1) provides some logging (2) avoids skip_test if amixer fails
 amixer -c"$sofcard" controls
 dlogi "pgalist number = ${#pgalist[@]}"