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Commit ab422df9 authored by Ajay Agarwal's avatar Ajay Agarwal Committed by Gerrit - the friendly Code Review server
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sound: usb: Add quirk to issue SET_CUR volume on 2nd channel 



Some audio devices with two channels require the host
to issue SET_CUR command on the Volume control on
both the channels in order to function (playback or
record). Currently, the Linux Host driver issues SET_CUR
only for the 1st channel. Hence, add the quirk for
concerned devices for SET_CUR on 2nd channel.

Change-Id: I6f0bbcdfd3a8b3ccb33a1d56c252c701849a442f
Signed-off-by: default avatarAjay Agarwal <ajaya@codeaurora.org>
parent 2e1cd8de

sound/usb/mixer.c

+11 −0
Original line number Diff line number Diff line
@@ -926,6 +926,17 @@ static void volume_control_quirks(struct usb_mixer_elem_info *cval, 
			cval->res = 384;

		}

		break;



	case USB_ID(0x1130, 0x1620): /* Logitech Speakers S150 */

	/* This audio device has 2 channels and it explicitly requires the

	 * host to send SET_CUR command on the volume control of both the

	 * channels. 7936 = 0x1F00 is the default value.

	 */

		if (cval->channels == 2)

			snd_usb_mixer_set_ctl_value(cval, UAC_SET_CUR,

						(cval->control << 8) | 2, 7936);

		break;



	}

}