From: Greg KH <greg@kroah.com>
To: linux-hotplug@vger.kernel.org
Subject: Re: snd-usb-audio driver (Was Re: udev: rules using multiple sysfs directories)
Date: Sat, 30 Apr 2005 05:23:14 +0000 [thread overview]
Message-ID: <20050430052314.GA10104@kroah.com> (raw)
In-Reply-To: <1114808502.14228.10.camel@daxter.boston.redhat.com>
On Fri, Apr 29, 2005 at 05:01:42PM -0400, David Zeuthen wrote:
> On Fri, 2005-04-29 at 13:09 -0700, Greg KH wrote:
> > You can do this, as you get two different hotplug events. This is
> > because usb drivers bind to the USB inteface, not the main device
> > itself.
>
> As an unrelated note this is actually not true for snd-usb-audio driver
>
> [davidz@daxter hal]$ ls -l /sys/class/sound/pcmC2D0c/
> total 0
> -r--r--r-- 1 root root 4096 Apr 29 16:57 dev
> lrwxrwxrwx 1 root root 0 Apr 29 16:57 device -> ../../../devices/pci0000:00/0000:00:1d.1/usb3/3-2
This should point to the interface, not the device, you are correct.
> [davidz@daxter hal]$ ls -l /sys/class/sound/pcmC2D0c/device/
> total 0
> drwxr-xr-x 3 root root 0 Apr 29 16:57 3-2:1.0
> drwxr-xr-x 3 root root 0 Apr 29 16:57 3-2:1.1
> drwxr-xr-x 3 root root 0 Apr 29 16:57 3-2:1.2
> drwxr-xr-x 3 root root 0 Apr 29 16:57 3-2:1.3
>
> Well, sort of, as
>
> [davidz@daxter hal]$ tree /sys/bus/usb/drivers/snd-usb-audio/
> /sys/bus/usb/drivers/snd-usb-audio/
> |-- 3-2:1.0 -> ../../../../devices/pci0000:00/0000:00:1d.1/usb3/3-2/3-2:1.0
> |-- 3-2:1.1 -> ../../../../devices/pci0000:00/0000:00:1d.1/usb3/3-2/3-2:1.1
> |-- 3-2:1.2 -> ../../../../devices/pci0000:00/0000:00:1d.1/usb3/3-2/3-2:1.2
> `-- module -> ../../../../module/snd_usb_audio
>
> That's a bug, right? Is this the right place to report it?
Bug in the alsa driver, I suggest reporting it to them. Should be a one
line fix.
thanks,
greg k-h
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next prev parent reply other threads:[~2005-04-30 5:23 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-04-29 21:01 snd-usb-audio driver (Was Re: udev: rules using multiple sysfs David Zeuthen
2005-04-30 5:23 ` Greg KH [this message]
2005-05-06 21:44 ` David Zeuthen
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