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 <johan@oljud.se>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

diff --git a/sound/usb/stream.c b/sound/usb/stream.c
index 310a3822d2b72b51586a9ee06954ef08667bbeb8..970086015cded9f0a75f4d66a1471b1e99d9bfd4 100644 (file)
--- 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);