ALSA: usb-audio: Change internal PCM order

New PCMs will now be added to the end of the chip's PCM list instead of to the front. This changes the way streams are combined so that the first capture stream will now be merged with the first playback stream instead of the last. This fixes a problem with ASUS U7. Cards with one playback stream and cards without capture streams should be unaffected by this change. Exception added for M-Audio Audiophile USB (tm) since it seems to have a fix to swap capture stream numbering in alsa-lib conf/cards/USB-audio.conf Signed-off-by: Johan Rastén <[email protected]> Signed-off-by: Takashi Iwai <[email protected]>
again4you · Sep 7, 2015 · 5ee20bc · 5ee20bc
1 parent 467e143
commit 5ee20bc
Showing 1 changed file with 9 additions and 1 deletion.
diff --git a/sound/usb/stream.c b/sound/usb/stream.c
@@ -377,7 +377,15 @@ int snd_usb_add_audio_stream(struct snd_usb_audio *chip,
 
 	snd_usb_init_substream(as, stream, fp);
 
-	list_add(&as->list, &chip->pcm_list);
+	/*
+	 * Keep using head insertion for M-Audio Audiophile USB (tm) which has a
+	 * fix to swap capture stream order in conf/cards/USB-audio.conf
+	 */
+	if (chip->usb_id == USB_ID(0x0763, 0x2003))
+		list_add(&as->list, &chip->pcm_list);
+	else
+		list_add_tail(&as->list, &chip->pcm_list);
+
 	chip->pcm_devs++;
 
 	snd_usb_proc_pcm_format_add(as);