Commit 2bd145b9 authored by Alan Stern's avatar Alan Stern Committed by Greg Kroah-Hartman

USB: update documentation for usbmon

commit d8cae98c upstream.

The documentation for usbmon is out of date; the usbfs "devices" file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>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@suse.de>
parent af94dba2
......@@ -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'
......
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