From c17dfb63aeff72efb37996049c5dda525c33cd31 Mon Sep 17 00:00:00 2001
From: Jaroslav Kysela <perex@perex.cz>
Date: Wed, 1 Jul 2026 16:41:23 +0200
Subject: [PATCH] ALSA: hda: mic: add initial support for driver source
 auto-switching

Use boost volume controls to detect this case.

Link: https://github.com/alsa-project/alsa-ucm-conf/pull/792
Signed-off-by: Jaroslav Kysela <perex@perex.cz>
---
 ucm2/HDA/HiFi-mic.conf | 83 +++++++++++++++++++++++++++++-------------
 1 file changed, 58 insertions(+), 25 deletions(-)

diff --git a/ucm2/HDA/HiFi-mic.conf b/ucm2/HDA/HiFi-mic.conf
index 37ffce5..e084700 100644
--- a/ucm2/HDA/HiFi-mic.conf
+++ b/ucm2/HDA/HiFi-mic.conf
@@ -6,14 +6,16 @@
 
 # Microphone related variables as used internally
 # HDA codecs can offer input source selection (mux) via "Input Source" or
-# "Capture Source" with varying options:
-#  'Internal Mic'
-#  'Headset Mic'
-#  'Headphone Mic'
-#  'Mic'
+# "Capture Source" with varying options '[PREFIX ]Mic' where PREFIX is
+# <Empty>,Internal,Headset,Headphone.
 #
 # or there can be 'Mic' and optional 'Front Mic' available
 #
+# There is also third variant - driver supports auto-switching. In
+# this case, the '[Prefix ]Mic Boost Volume' controls exists. There are also
+# phantom jacks exported by the driver in this case, but it's not
+# necessary to use them. Prefixes: <Empty>,Internal,Front
+#
 # This leads to up to maximum of four possible input devices.
 
 Define.SourceControl ""
@@ -162,7 +164,7 @@ DefineMacro.HDAMicSwitch.SectionDevice."${var:__DevName}" {
 		CaptureVolume "${var:__Name} Volume"
 		CaptureSwitch "${var:__Name} Switch"
 		CaptureMasterElem "${var:__Name} Boost"
-		JackControl "${var:__Jack}"
+		JackControl "${var:-__Jack}"
 	}
 }
 
@@ -202,27 +204,58 @@ If.micsetup {
 			Jack "${var:MicHSJackControl}"
 		}
 	}
-	True {
-		# the input selection is via switches, the possible types are
-		# Mic and Front Mic
-		Macro.mic.HDAMicSwitch {
-			DevName "Mic:hda"
-			Comment "Stereo Microphone"
-			Name "Mic"
-			Priority 100
-			Jack "${var:MicJackControl}"
+	True.If.autoswitch {
+		Condition {
+			Type ControlExists
+			Control "name='Internal Mic Boost Volume'"
 		}
-		If.fmic {
-			Condition {
-				Type ControlExists
-				Control "name='Front Mic Playback Switch'"
+		False {
+			# the input selection is via switches, the possible types are
+			# Mic and Front Mic
+			Macro.mic.HDAMicSwitch {
+				DevName "Mic:hda"
+				Comment "Stereo Microphone"
+				Name "Mic"
+				Priority 100
+				Jack "${var:MicJackControl}"
 			}
-			True.Macro.fmic.HDAMicSwitch {
-				DevName "Mic:hda-front"
-				Comment "Front Stereo Microphone"
-				Name "Front Mic"
-				Priority 200
-				Jack "Front Mic Jack"
+			If.fmic {
+				Condition {
+					Type ControlExists
+					Control "name='Front Mic Playback Switch'"
+				}
+				True.Macro.fmic.HDAMicSwitch {
+					DevName "Mic:hda-front"
+					Comment "Front Stereo Microphone"
+					Name "Front Mic"
+					Priority 200
+					Jack "Front Mic Jack"
+				}
+			}
+		}
+		True {
+			# third variant - the driver does auto-switching
+			# note that we should assign right Jack controls to
+			# allow expose the boost volume
+			Macro.mic.HDAMicSwitch {
+				DevName "Mic:hda-int"
+				Comment "Internal Stereo Microphone"
+				Name "Internal Mic"
+				Priority 100
+			}
+			If.mic {
+				# external microphone
+				Condition {
+					Type ControlExists
+					Control "name='Mic Boost Volume'"
+				}
+				True.Macro.mic.HDAMicSwitch {
+					DevName "Mic:hda"
+					Comment "Stereo Microphone"
+					Name "Mic"
+					Priority 200
+					Jack "${var:MicJackControl}"
+				}
 			}
 		}
 	}