snd-usb-audio driver (Was Re: udev: rules using multiple sysfs

snd-usb-audio driver (Was Re: udev: rules using multiple sysfs

[David Zeuthen]

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
        [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?

Cheers,
David




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Re: snd-usb-audio driver (Was Re: udev: rules using multiple sysfs directories)

[Greg KH]

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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Re: snd-usb-audio driver (Was Re: udev: rules using multiple sysfs

[David Zeuthen]

On Fri, 2005-04-29 at 22:23 -0700, Greg KH wrote:
> Bug in the alsa driver, I suggest reporting it to them.  Should be a one
> line fix.

I've filed it here

 https://bugtrack.alsa-project.org/alsa-bug/view.php?id\x1093

Cheers,
David




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