ALSA: usb-audio: add volume quirks for MS LifeChat LX-3000

ID 045e:070f Microsoft Corp. LifeChat LX-3000 Headset
has muted minimum Speaker Playback Volume, and 4 amixer steps were
observed to produce 1 actual volume step.

Apply min_mute quirk and correct res=48 -> 4*48.
Tested with the device.

Signed-off-by: Pauli Virtanen <pav@iki.fi>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

Author: pv

sound/usb/mixer.c

@@ -1147,6 +1147,14 @@ static void volume_control_quirks(struct usb_mixer_elem_info *cval,
 		}
 		break;
 
+	case USB_ID(0x045e, 0x070f): /* MS LifeChat LX-3000 Headset */
+		if (!strcmp(kctl->id.name, "Speaker Playback Volume")) {
+			usb_audio_info(chip,
+				"set volume quirk for MS LifeChat LX-3000\n");
+			cval->res = 192;
+		}
+		break;
+
 	case USB_ID(0x0471, 0x0101):
 	case USB_ID(0x0471, 0x0104):
 	case USB_ID(0x0471, 0x0105):

sound/usb/quirks.c

@@ -2153,6 +2153,8 @@ static const struct usb_audio_quirk_flags_table quirk_flags_table[] = {
 	DEVICE_FLG(0x045e, 0x083c, /* MS USB Link headset */
 		   QUIRK_FLAG_GET_SAMPLE_RATE | QUIRK_FLAG_CTL_MSG_DELAY |
 		   QUIRK_FLAG_DISABLE_AUTOSUSPEND),
+	DEVICE_FLG(0x045e, 0x070f, /* MS LifeChat LX-3000 Headset */
+		   QUIRK_FLAG_MIXER_PLAYBACK_MIN_MUTE),
 	DEVICE_FLG(0x046d, 0x0807, /* Logitech Webcam C500 */
 		   QUIRK_FLAG_CTL_MSG_DELAY_1M | QUIRK_FLAG_MIC_RES_384),
 	DEVICE_FLG(0x046d, 0x0808, /* Logitech Webcam C600 */