From d0ef97c77c77b687f364b208cade88c9369b278d Mon Sep 17 00:00:00 2001
From: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Date: Thu, 21 Jan 2021 14:44:05 -0600
Subject: [PATCH] sof-soundwire: add support for dmics

the pinmux allows for SoundWire to be used on e.g. link0 and link1,
and the rest of the pins can be assigned for dmic usages.

We currently don't track this capability which means users don't see a
capture device, e.g. on HP Spectre x360.

The sof_sdw machine driver was modified to report the cfg-dmics
string, possible values are 0..4.

This is completely untested, just to get feedback from Jaroslav on the
UCM3 syntax :-)

BugLink: https://github.com/thesofproject/linux/issues/2700
Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Signed-off-by: Jaroslav Kysela <perex@perex.cz>
---
 ucm2/sof-soundwire/dmic.conf          | 21 +++++++++++++++++++++
 ucm2/sof-soundwire/sof-soundwire.conf |  5 +++++
 2 files changed, 26 insertions(+)
 create mode 100644 ucm2/sof-soundwire/dmic.conf

diff --git a/ucm2/sof-soundwire/dmic.conf b/ucm2/sof-soundwire/dmic.conf
new file mode 100644
index 00000000..1f704a53
--- /dev/null
+++ b/ucm2/sof-soundwire/dmic.conf
@@ -0,0 +1,21 @@
+SectionDevice."Mic" {
+	Comment "Digital Microphone"
+
+	Value {
+		CapturePriority 100
+		CapturePCM "hw:${CardId},3"
+		If.chn {
+			Condition {
+				Type RegexMatch
+				Regex "[34]"
+				String "${var:Mics1}"
+			}
+			True {
+				CaptureChannels 4
+			}
+		}
+		CaptureMixerElem "Dmic0"
+		CaptureVolume "Dmic0 Capture Volume"
+		CaptureSwitch "Dmic0 Capture Switch"
+	}
+}
diff --git a/ucm2/sof-soundwire/sof-soundwire.conf b/ucm2/sof-soundwire/sof-soundwire.conf
index 2ba44be8..ec8b01e1 100644
--- a/ucm2/sof-soundwire/sof-soundwire.conf
+++ b/ucm2/sof-soundwire/sof-soundwire.conf
@@ -11,6 +11,7 @@ Define {
 	SpeakerAmps1 "0"
 	HeadsetCodec1 ""
 	MicCodec1 ""
+	Mics1 "0"
 }
 
 DefineRegex {
@@ -34,6 +35,10 @@ DefineRegex {
 		Regex " mic:([a-z0-9]+)"
 		String "${CardComponents}"
 	}
+	Mics {
+		Regex " cfg-mics:([1-9][0-9]*)"
+		String "${CardComponents}"
+	}
 }
 
 If.hs_init {