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[4.19,59/95] ALSA: usb-audio: mixer: volume quirk for ESS Technology Asus USB DAC

Message ID 20200601174030.474392946@linuxfoundation.org
State New
Headers show
Series None | expand

Commit Message

Greg KH June 1, 2020, 5:53 p.m. UTC 
From: Chris Chiu <chiu@endlessm.com>

[ Upstream commit 4020d1ccbe55bdf67b31d718d2400506eaf4b43f ]

The Asus USB DAC is a USB type-C audio dongle for connecting to
the headset and headphone. The volume minimum value -23040 which
is 0xa600 in hexadecimal with the resolution value 1 indicates
this should be endianness issue caused by the firmware bug. Add
a volume quirk to fix the volume control problem.

Also fixes this warning:
  Warning! Unlikely big volume range (=23040), cval->res is probably wrong.
  [5] FU [Headset Capture Volume] ch = 1, val = -23040/0/1
  Warning! Unlikely big volume range (=23040), cval->res is probably wrong.
  [7] FU [Headset Playback Volume] ch = 1, val = -23040/0/1

Signed-off-by: Chris Chiu <chiu@endlessm.com>
Cc: <stable@vger.kernel.org>
Link: https://lore.kernel.org/r/20200526062613.55401-1-chiu@endlessm.com
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 sound/usb/mixer.c | 8 ++++++++
 1 file changed, 8 insertions(+)
diff mbox series

Patch

diff --git a/sound/usb/mixer.c b/sound/usb/mixer.c
index 7a5c665cf4e4..8a0211131fc6 100644
--- a/sound/usb/mixer.c
+++ b/sound/usb/mixer.c
@@ -1186,6 +1186,14 @@  static void volume_control_quirks(struct usb_mixer_elem_info *cval,
 			cval->res = 384;
 		}
 		break;
+	case USB_ID(0x0495, 0x3042): /* ESS Technology Asus USB DAC */
+		if ((strstr(kctl->id.name, "Playback Volume") != NULL) ||
+			strstr(kctl->id.name, "Capture Volume") != NULL) {
+			cval->min >>= 8;
+			cval->max = 0;
+			cval->res = 1;
+		}
+		break;
 	}
 }