linux-kernel - [PATCH 3.16 297/366] ALSA: usb: mixer: volume quirk for CM102-A+/102S+

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Message-ID: <lsq.1539530741.396031314@decadent.org.uk>
Date:   Sun, 14 Oct 2018 16:25:41 +0100
From:   Ben Hutchings <ben@...adent.org.uk>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:     akpm@...ux-foundation.org, "Takashi Iwai" <tiwai@...e.de>,
        "Federico Cuello" <fedux@...ux.com.ar>
Subject: [PATCH 3.16 297/366] ALSA: usb: mixer: volume quirk for
 CM102-A+/102S+

3.16.60-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: Federico Cuello <fedux@...ux.com.ar>

commit 21493316a3c4598f308d5a9fa31cc74639c4caff upstream.

Currently it's not possible to set volume lower than 26% (it just mutes).

Also fixes this warning:

  Warning! Unlikely big volume range (=9472), cval->res is probably wrong.
  [13] FU [PCM Playback Volume] ch = 2, val = -9473/-1/1

, and volume works fine for full range.

Signed-off-by: Federico Cuello <fedux@...ux.com.ar>
Signed-off-by: Takashi Iwai <tiwai@...e.de>
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 sound/usb/mixer.c | 8 ++++++++
 1 file changed, 8 insertions(+)

--- a/sound/usb/mixer.c
+++ b/sound/usb/mixer.c
@@ -885,6 +885,14 @@ static void volume_control_quirks(struct
 		}
 		break;
 
+	case USB_ID(0x0d8c, 0x0103):
+		if (!strcmp(kctl->id.name, "PCM Playback Volume")) {
+			usb_audio_info(chip,
+				 "set volume quirk for CM102-A+/102S+\n");
+			cval->min = -256;
+		}
+		break;
+
 	case USB_ID(0x0471, 0x0101):
 	case USB_ID(0x0471, 0x0104):
 	case USB_ID(0x0471, 0x0105):