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From: Andrew Thompson <thompsa@FreeBSD.org>
Date: Wed, 27 May 2009 19:45:04 +0000 (UTC)
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Subject: svn commit: r192929 - head/sys/dev/sound/usb
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Author: thompsa
Date: Wed May 27 19:45:04 2009
New Revision: 192929
URL: http://svn.freebsd.org/changeset/base/192929

Log:
  Provide a workaround for USB devices that do not support mono or stereo
  operation by overriding the channel count.
  
  Submitted by:	Hans Petter Selasky
  Reported by:	MIHIRA Sanpei Yoshiro

Modified:
  head/sys/dev/sound/usb/uaudio.c

Modified: head/sys/dev/sound/usb/uaudio.c
==============================================================================
--- head/sys/dev/sound/usb/uaudio.c	Wed May 27 19:41:29 2009	(r192928)
+++ head/sys/dev/sound/usb/uaudio.c	Wed May 27 19:45:04 2009	(r192929)
@@ -97,6 +97,7 @@ SYSCTL_INT(_hw_usb_uaudio, OID_AUTO, def
 
 #define	MAKE_WORD(h,l) (((h) << 8) | (l))
 #define	BIT_TEST(bm,bno) (((bm)[(bno) / 8] >> (7 - ((bno) % 8))) & 1)
+#define	UAUDIO_MAX_CHAN(x) (((x) < 2) ? (x) : 2)	/* XXX fixme later */
 
 struct uaudio_mixer_node {
 	int32_t	minval;
@@ -936,7 +937,7 @@ uaudio_chan_fill_info_sub(struct uaudio_
 #endif
 
 			wFormat = UGETW(asid->wFormatTag);
-			bChannels = asf1d->bNrChannels;
+			bChannels = UAUDIO_MAX_CHAN(asf1d->bNrChannels);
 			bBitResolution = asf1d->bBitResolution;
 
 			if (asf1d->bSamFreqType == 0) {
@@ -1020,7 +1021,8 @@ uaudio_chan_fill_info_sub(struct uaudio_
 						chan->usb2_cfg =
 						    uaudio_cfg_play;
 
-					sample_size = ((chan->p_asf1d->bNrChannels *
+					sample_size = ((
+					    UAUDIO_MAX_CHAN(chan->p_asf1d->bNrChannels) *
 					    chan->p_asf1d->bBitResolution) / 8);
 
 					/*
@@ -1334,7 +1336,7 @@ uaudio_chan_init(struct uaudio_softc *sc
 
 	ch->pcm_cap.fmtlist[0] = ch->p_fmt->freebsd_fmt;
 
-	if (ch->p_asf1d->bNrChannels == 2) {
+	if (ch->p_asf1d->bNrChannels >= 2) {
 		ch->pcm_cap.fmtlist[0] |= AFMT_STEREO;
 	}
 	ch->pcm_cap.fmtlist[1] = 0;