ALSA: usb: mixer: volume quirk for CM102-A+/102S+

Commit Message

Federico Cuello May 7, 2018, 4:42 p.m. UTC

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.
---
  sound/usb/mixer.c | 8 ++++++++
  1 file changed, 8 insertions(+)

  	case USB_ID(0x0471, 0x0105):

Patch

diff --git a/sound/usb/mixer.c b/sound/usb/mixer.c
index 344d7b069d59..bb5ab7a7dfa5 100644
--- a/sound/usb/mixer.c
+++ b/sound/usb/mixer.c
@@ -967,6 +967,14 @@  static void volume_control_quirks(struct 
usb_mixer_elem_info *cval,
  		}
  		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):