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Commit b9d43bcd authored by Pavel Machek's avatar Pavel Machek Committed by Takashi Iwai
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[ALSA] usb audio: Fix another Dallas quirk 



Dallas USB speakers are buggy in more than one way. One of configs
they offer does not work at all.

Signed-off-by: default avatarPavel Machek <pavel@suse.cz>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarTakashi Iwai <tiwai@suse.de>
parent eaa9985b

sound/usb/usbaudio.c

+12 −1
Original line number Diff line number Diff line
@@ -2676,12 +2676,23 @@ static int parse_audio_endpoints(struct snd_usb_audio *chip, int iface_no) 
	int format;

	struct audioformat *fp;

	unsigned char *fmt, *csep;

	int num;



	dev = chip->dev;



	/* parse the interface's altsettings */

	iface = usb_ifnum_to_if(dev, iface_no);

	for (i = 0; i < iface->num_altsetting; i++) {



	num = iface->num_altsetting;



	/*

	 * Dallas DS4201 workaround: It presents 5 altsettings, but the last

	 * one misses syncpipe, and does not produce any sound.

	 */

	if (chip->usb_id == USB_ID(0x04fa, 0x4201))

		num = 4;



	for (i = 0; i < num; i++) {

		alts = &iface->altsetting[i];

		altsd = get_iface_desc(alts);

		/* skip invalid one */