From: Greg KH <greg@kroah.com>
To: Jeffrey Walton <noloader@gmail.com>
Cc: kernelnewbies <kernelnewbies@kernelnewbies.org>
Subject: Re: How to log USB modem data for a specific device?
Date: Mon, 11 Nov 2019 17:31:31 +0100 [thread overview]
Message-ID: <20191111163131.GB1017642@kroah.com> (raw)
In-Reply-To: <CAH8yC8kn8Bh8wBf+0shc5zzRaq4qW+MF1xx4vtBw582F8vrsBg@mail.gmail.com>
On Mon, Nov 11, 2019 at 11:11:06AM -0500, Jeffrey Walton wrote:
> Hi Everyone,
>
> I'm having trouble with a C application that opens a USB modem. The
> application is not receiving some data from a USR modem. Conexant
> modems are OK.
>
> I'm working through
> https://www.kernel.org/doc/Documentation/usb/usbmon.txt . I found the
> modem at Bus=01 Dev=24:
>
> T: Bus=01 Lev=03 Prnt=07 Port=00 Cnt=01 Dev#= 24 Spd=480 MxCh= 0
> D: Ver= 2.00 Cls=02(comm.) Sub=00 Prot=00 MxPS=64 #Cfgs= 1
> P: Vendor=0baf ProdID=0303 Rev= 2.00
> S: Manufacturer=U.S.Robotics
> S: Product=USB Modem
>
> This is where my confusion lies. It is not clear to me how to
> determine which socket to use for step #3 in usbmon.txt. Step #3 says:
>
> # cat /sys/kernel/debug/usb/usbmon/3u > /tmp/1.mon.out
>
> How do I determine which socket to use for Bus=01 Dev=24?
From the above documentation, it says to use "3u" for all devices on the
3rd bus. You want the 1st bus, right? So did you try using "1u"?
I think wireshark can intrepret usbmon output, so maybe just use that
instead and point it at the USB bus you want to watch?
good luck!
greg k-h
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next prev parent reply other threads:[~2019-11-11 16:32 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-11-11 16:11 How to log USB modem data for a specific device? Jeffrey Walton
2019-11-11 16:31 ` Greg KH [this message]
2019-11-11 16:40 ` Jeffrey Walton
2019-11-11 17:24 ` Greg KH
2019-11-11 22:57 ` Jeffrey Walton
2019-11-12 5:37 ` Greg KH
2019-11-12 6:20 ` Jeffrey Walton
2019-11-12 18:15 ` Jeffrey Walton
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