linux-kernel - [PATCH 4/4] ALSA: usb-audio: apply quirk for MOONDROP Quark2

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Message-Id: <20250903-sound-v1-4-d4ca777b8512@uniontech.com>
Date: Wed, 03 Sep 2025 13:09:48 +0800
From: Cryolitia PukNgae via B4 Relay <devnull+cryolitia.uniontech.com@...nel.org>
To: Jaroslav Kysela <perex@...ex.cz>, Takashi Iwai <tiwai@...e.com>, 
 Jonathan Corbet <corbet@....net>
Cc: linux-sound@...r.kernel.org, linux-kernel@...r.kernel.org, 
 Mingcong Bai <jeffbai@...c.io>, Kexy Biscuit <kexybiscuit@...c.io>, 
 Nie Cheng <niecheng1@...ontech.com>, Zhan Jun <zhanjun@...ontech.com>, 
 Feng Yuan <fengyuan@...ontech.com>, Celeste Liu <uwu@...lacanthus.name>, 
 qaqland <anguoli@...ontech.com>, linux-doc@...r.kernel.org, 
 Cryolitia PukNgae <cryolitia@...ontech.com>
Subject: [PATCH 4/4] ALSA: usb-audio: apply quirk for MOONDROP Quark2

From: Cryolitia PukNgae <cryolitia@...ontech.com>

It reports a MIN value -15360 for volume control, but will mute when
setting it less than -14208

Tested-by: Guoli An <anguoli@...ontech.com>
Signed-off-by: Cryolitia PukNgae <cryolitia@...ontech.com>
---
 sound/usb/mixer.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/sound/usb/mixer.c b/sound/usb/mixer.c
index 5fcf1117777d1a1423806ea139a7692eea3c9ee8..34bcbfd8b54e66abc0229eefd354eb7bc4c01576 100644
--- a/sound/usb/mixer.c
+++ b/sound/usb/mixer.c
@@ -1182,6 +1182,13 @@ static void volume_control_quirks(struct usb_mixer_elem_info *cval,
 			cval->res = 1;
 		}
 		break;
+	case USB_ID(0x3302, 0x12db): /* MOONDROP Quark2 */
+		if (!strcmp(kctl->id.name, "PCM Playback Volume")) {
+			usb_audio_info(chip,
+				"set volume quirk for MOONDROP Quark2\n");
+			cval->min = -14208; /* Mute under it */
+		}
+		break;
 	}
 }
 

-- 
2.51.0