Add realtek-coeffs script

scripts/realtek-coeffs.sh

@@ -0,0 +1,37 @@
+#!/usr/bin/env bash
+
+if [ "${EUID}" != "0" ]
+then
+	exec sudo "$0" "$@"
+fi
+
+set -e
+
+for codec in /dev/snd/hw*
+do
+	codec_id="$(basename "${codec}")"
+	codec_sys="/sys/class/sound/${codec_id}"
+	vendor="$(cat "${codec_sys}/vendor_name")"
+	chip="$(cat "${codec_sys}/chip_name")"
+	if [ "${vendor}" == "Realtek" ]
+	then
+		echo "# ${codec_id}: ${vendor} ${chip}"
+
+		# Realtek vendor node
+		nid=0x20
+
+		# Get processing capabilities
+		proc_cap="$(hda-verb "${codec}" "${nid}" PARAMETERS PROC_CAP 2>/dev/null | cut -d " " -f 3)"
+
+		seq "$(("${proc_cap}" >> 8))" | while read index
+		do
+			# Set coefficient index
+			index_hex="$(printf "0x%02x\n" "${index}")"
+			hda-verb "${codec}" "${nid}" SET_COEF_INDEX "${index_hex}" &>/dev/null
+
+			# Get processing coefficient
+			value="$(hda-verb "${codec}" "${nid}" GET_PROC_COEF 0 2>/dev/null | cut -d " " -f 3)"
+			echo "${index_hex}: ${value}"
+		done
+	fi
+done