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Commit d8cae98c authored by Alan Stern's avatar Alan Stern Committed by Greg Kroah-Hartman
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USB: update documentation for usbmon 



The documentation for usbmon is out of date; the usbfs "devices" file
now exists in /sys/kernel/debug/usb rather than /proc/bus/usb.  This
patch (as1505) updates the documentation accordingly, and also
mentions that the necessary information can be found by running lsusb.

Signed-off-by: default avatarAlan Stern <stern@rowland.harvard.edu>
CC: Pete Zaitcev <zaitcev@redhat.com>
Cc: stable <stable@vger.kernel.org>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@suse.de>
parent 1a3a026b

Documentation/usb/usbmon.txt

+9 −5
Original line number Diff line number Diff line
@@ -47,10 +47,11 @@ This allows to filter away annoying devices that talk continuously. 


2. Find which bus connects to the desired device



Run "cat /proc/bus/usb/devices", and find the T-line which corresponds to

the device. Usually you do it by looking for the vendor string. If you have

many similar devices, unplug one and compare two /proc/bus/usb/devices outputs.

The T-line will have a bus number. Example:

Run "cat /sys/kernel/debug/usb/devices", and find the T-line which corresponds

to the device. Usually you do it by looking for the vendor string. If you have

many similar devices, unplug one and compare the two

/sys/kernel/debug/usb/devices outputs. The T-line will have a bus number.

Example:



T:  Bus=03 Lev=01 Prnt=01 Port=00 Cnt=01 Dev#=  2 Spd=12  MxCh= 0

D:  Ver= 1.10 Cls=00(>ifc ) Sub=00 Prot=00 MxPS= 8 #Cfgs=  1
@@ -58,7 +59,10 @@ P: Vendor=0557 ProdID=2004 Rev= 1.00 
S:  Manufacturer=ATEN

S:  Product=UC100KM V2.00



Bus=03 means it's bus 3.

"Bus=03" means it's bus 3. Alternatively, you can look at the output from

"lsusb" and get the bus number from the appropriate line. Example:



Bus 003 Device 002: ID 0557:2004 ATEN UC100KM V2.00



3. Start 'cat'