linux-kernel - [PATCH] ALSA: usb-audio: apply quirk for Huawei Technologies Co., Ltd. CM-Q3

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Message-Id: <20251011-sound_quirk-v1-1-d693738108ee@linux.dev>
Date: Sat, 11 Oct 2025 17:51:18 +0800
From: Cryolitia PukNgae <cryolitia.pukngae@...ux.dev>
To: Jaroslav Kysela <perex@...ex.cz>, Takashi Iwai <tiwai@...e.com>, 
 Cryolitia PukNgae <cryolitia@...ontech.com>
Cc: linux-sound@...r.kernel.org, linux-kernel@...r.kernel.org, 
 stable@...r.kernel.org, zhanjun@...ontech.com, niecheng1@...ontech.com, 
 anguoli@...ontech.com, zhaochengyi@...ontech.com, fengyuan@...ontech.com, 
 Cryolitia PukNgae <cryolitia.pukngae@...ux.dev>
Subject: [PATCH] ALSA: usb-audio: apply quirk for Huawei Technologies Co.,
 Ltd. CM-Q3

There're several different actual hardwares sold by Huawei, using the
same USB ID 12d1:3a07.

The first one we found, having a volume control named "Headset Playback
Volume", reports a min value -15360, and will mute iff setting it to
-15360. It can be simply fixed by quirk flag MIXER_PLAYBACK_MIN_MUTE,
which we have already submitted previously.[1]

The second one we found today, having a volume control named "PCM
Playback Volume", reports its min -11520 and res 256, and will mute
when less than -11008. Because of the already existing quirk flag, we
can just set its min to -11264, and the new minimum value will still
not be available to userspace, so that userspace's minimum will be the
correct -11008.

1. https://lore.kernel.org/all/20250903-sound-v1-3-d4ca777b8512@uniontech.com/

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

diff --git a/sound/usb/mixer.c b/sound/usb/mixer.c
index 34bcbfd8b54e66abc0229eefd354eb7bc4c01576..ae412e651faf905c9f7d600de8e19c51995cd3f9 100644
--- a/sound/usb/mixer.c
+++ b/sound/usb/mixer.c
@@ -1189,6 +1189,13 @@ static void volume_control_quirks(struct usb_mixer_elem_info *cval,
 			cval->min = -14208; /* Mute under it */
 		}
 		break;
+	case USB_ID(0x12d1, 0x3a07): /* Huawei Technologies Co., Ltd. CM-Q3 */
+		if (!strcmp(kctl->id.name, "PCM Playback Volume")) {
+			usb_audio_info(chip,
+				       "set volume quirk for Huawei Technologies Co., Ltd. CM-Q3\n");
+			cval->min = -11264; /* Mute under it */
+		}
+		break;
 	}
 }

---
base-commit: 7e9827afc78073096149cf3565ba668fe2ef4831
change-id: 20251011-sound_quirk-6a8326325451

Best regards,
-- 
Cryolitia PukNgae <cryolitia.pukngae@...ux.dev>