Add dump_coeff.sh script

Changelog.md

@@ -2,6 +2,7 @@ AppleALC Changelog
 ==================
 #### v1.7.0
 - Fix headphones after sleep on Latitude 7390 2-in-1 (ALC225 layout 30)
+- Added `dump_coeff.sh` script in `Tools` to dump processing caps under macOS, plus docs in Wiki
 
 #### v1.6.9
 - Added 0x100003 revision for ALCS1220A

Tools/dump_coeff.sh

@@ -0,0 +1,30 @@
+#!/bin/bash
+
+# dump_coeff.sh - Dump processing caps for node in macOS using alc-verb.
+#
+# Copyright (c) 2022, Michael Beaton. All rights reserved.<BR>
+# SPDX-License-Identifier: BSD-3-Clause
+#
+
+if [ -z "$1" ] || [ -z "$2" ] || [ -z "$3" ] || [ ! -z "$4" ]
+then
+    echo "Usage: dump_coeff {device-index} {node-id} {count}"
+    exit 0
+fi
+
+if ! command -v alc-verb &> /dev/null
+then
+    echo "alc-verb is not installed in path"
+    exit -1
+fi
+
+echo "Node $2"
+echo "  Processing caps: ncoeff=$(($3))"
+
+for (( i = 0; i < $(($3)); i++ ))
+do
+    alc-verb -d $1 $2 SET_COEF_INDEX $i 2>/dev/null >/dev/null
+    coeff=$(alc-verb -d $1 $2 GET_COEF_INDEX 0 2>/dev/null | tail -n 1)
+    value=$(alc-verb -d $1 $2 GET_PROC_COEF 0 2>/dev/null | tail -n 1)
+    printf "    Coeff 0x%02x: 0x%04x\n" $coeff $value
+done