--- a/Makefile	Mon Apr 04 18:15:52 2022 +0000
+++ b/Makefile	Tue Apr 05 06:22:50 2022 +0000
@@ -1,4 +1,4 @@
-SUBDIR=	aud-caramel aud-fcdev3b batteries charging
+SUBDIR=	aud-c139 aud-caramel aud-fcdev3b batteries charging
 
 all:	${SUBDIR}
 

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/aud-c139/Makefile	Tue Apr 05 06:22:50 2022 +0000
@@ -0,0 +1,23 @@
+BINFILES=	handheld.cfg handheld.vol headset.cfg headset.vol
+INSTDIR=	/opt/freecalypso/aud-c139
+
+all:	${BINFILES}
+
+handheld.cfg:	handheld.src
+	tiaud-compile $< $@
+
+handheld.vol:	Makefile
+	tiaud-mkvol 150 $@
+
+headset.cfg:	headset.src
+	tiaud-compile $< $@
+
+headset.vol:	Makefile
+	tiaud-mkvol 150 $@
+
+install:	${BINFILES}
+	mkdir -p ${INSTDIR}
+	install -c -m 644 ${BINFILES} ${INSTDIR}
+
+clean:
+	rm -f *.cfg *.vol

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/aud-c139/handheld.src	Tue Apr 05 06:22:50 2022 +0000
@@ -0,0 +1,18 @@
+# C139 handheld audio mode, currently based on the register readings
+# provided by Das Signal in 2021-11.
+
+mic default {
+	gain 2		# value reported by DS for the active call state
+	output-bias 0	# C139 uses 2.0V
+}
+
+# We are going to configure downlink FIR and PGA when we get a better
+# test setup - run with safe defaults for now.
+speaker ear {
+	gain 0
+}
+
+sidetone -23
+
+# C139 AEC config for handheld mode
+aec-new 2 1 0x14 0x4CCC 0x59AD 0x7500 0 0x1000 0x1000 0 4 0x40

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/aud-c139/headset.src	Tue Apr 05 06:22:50 2022 +0000
@@ -0,0 +1,24 @@
+# C139 headset audio mode, reconstructed from register readings
+# collected in freecalypso-reveng repository, compal/audio directory
+
+mic headset {
+	gain 9		# read out via omr in active call state
+	output-bias 0	# C139 uses 2.0V
+}
+
+# C139 fw applies complex volume control: it messes with PGA settings,
+# and in headset mode it also applies a FIR filter that produces a 6 dB
+# digital gain without any frequency curve transformation.
+#
+# For FreeCalypso, given how far we are from actually using the headset jack
+# on C139 for its headset function (as opposed to the serial port),
+# we are going to start with PGA at 0 and no weird FIR.
+
+speaker headset {
+	gain 0
+}
+
+sidetone -23		# readout of VBUCTRL from official fw
+
+# C139 AEC config for headset mode
+aec-new 2 1 0x14 0x4CCC 0x59AD 0x7500 0 0x1000 0x1000 0 4 0x20