From c3bdca7851036acb2ddcb2d012133d882de11b2b Mon Sep 17 00:00:00 2001
From: Jaroslav Kysela <perex@perex.cz>
Date: Thu, 15 Jan 2026 15:53:03 +0100
Subject: [PATCH] USB-Audio: improve channel detection for Solid State Labs SSL
 2

It seems that there are two variants with different capture
channel count. Try to identify them using USB bcdDevice value.

Link: https://github.com/alsa-project/alsa-ucm-conf/issues/676
Signed-off-by: Jaroslav Kysela <perex@perex.cz>
---
 ucm2/USB-Audio/SolidStateLabs/SSL2-HiFi.conf |  6 +++---
 ucm2/USB-Audio/SolidStateLabs/SSL2.conf      | 14 +++++++++++++-
 2 files changed, 16 insertions(+), 4 deletions(-)

diff --git a/ucm2/USB-Audio/SolidStateLabs/SSL2-HiFi.conf b/ucm2/USB-Audio/SolidStateLabs/SSL2-HiFi.conf
index 8663384..34cac9c 100644
--- a/ucm2/USB-Audio/SolidStateLabs/SSL2-HiFi.conf
+++ b/ucm2/USB-Audio/SolidStateLabs/SSL2-HiFi.conf
@@ -6,7 +6,7 @@ Macro [
 			Name "ssl2_mono_in"
 			Direction Capture
 			Channels 1
-			HWChannels 4
+			HWChannels "${var:DirectCaptureChannels}"
 			HWChannelPos0 MONO
 			HWChannelPos1 MONO
 		}
@@ -31,7 +31,7 @@ SectionDevice."Mic1" {
 	Macro.pcm_split.SplitPCMDevice {
 		Name "ssl2_mono_in"
 		Direction Capture
-		HWChannels 4
+		HWChannels "${var:DirectCaptureChannels}"
 		Channels 1
 		Channel0 0
 		ChannelPos0 MONO
@@ -47,7 +47,7 @@ SectionDevice."Mic2" {
 	Macro.pcm_split.SplitPCMDevice {
 		Name "ssl2_mono_in"
 		Direction Capture
-		HWChannels 4
+		HWChannels "${var:DirectCaptureChannels}"
 		Channels 1
 		Channel0 1
 		ChannelPos0 MONO
diff --git a/ucm2/USB-Audio/SolidStateLabs/SSL2.conf b/ucm2/USB-Audio/SolidStateLabs/SSL2.conf
index 694b718..ea5d161 100644
--- a/ucm2/USB-Audio/SolidStateLabs/SSL2.conf
+++ b/ucm2/USB-Audio/SolidStateLabs/SSL2.conf
@@ -1,5 +1,17 @@
 Comment "Solid State Labs SSL 2"
 
+Define.DirectPlaybackChannels 2
+Define.DirectCaptureChannels 4
+
+If.fw {
+	Condition {
+		Type RegexMatch
+		String "${sys-card:device/../bcdDevice}"
+		Regex "00.."
+	}
+	True.Define.DirectCaptureChannels 2
+}
+
 SectionUseCase."HiFi" {
 	Comment "HiFi"
 	File "/USB-Audio/SolidStateLabs/SSL2-HiFi.conf"
@@ -7,4 +19,4 @@ SectionUseCase."HiFi" {
 
 Include.dhw.File "/common/directm.conf"
 
-Macro.0.DirectUseCase { Id="Direct" PlaybackChannels=2 CaptureChannels=4 }
+Macro.0.DirectUseCase { Id="Direct" PlaybackChannels="${var:DirectPlaybackChannels}" CaptureChannels="${var:DirectCaptureChannels}" }
-- 
2.47.3