linux-kernel - Re: usb audio: Fix another Dallas quirk

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Date:	Mon, 14 Apr 2008 12:21:35 +0200
From:	Takashi Iwai <tiwai@...e.de>
To:	Pavel Machek <pavel@...e.cz>
Cc:	perex@...ex.cz, kernel list <linux-kernel@...r.kernel.org>
Subject: Re: usb audio: Fix another Dallas quirk

At Sat, 29 Mar 2008 23:32:41 +0100,
Pavel Machek wrote:
> 
> 
> Dallas USB speakers are buggy in more than one way. One of configs
> they offer does not work at all.
> 
> Signed-off-by: Pavel Machek <pavel@...e.cz>

Applied this to ALSA tree, too.  Thanks.


Takashi

> 
> diff --git a/sound/usb/usbaudio.c b/sound/usb/usbaudio.c
> index 257a4e1..b6b2490 100644
> --- a/sound/usb/usbaudio.c
> +++ b/sound/usb/usbaudio.c
>  	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 */
> 
> -- 
> (english) http://www.livejournal.com/~pavelmachek
> (cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
> 
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