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USB: update documentation for usbmon

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The documentation for usbmon is out of date; the usbfs "devices" file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: Alan Stern <stern@rowland.harvard.edu>
CC: Pete Zaitcev <zaitcev@redhat.com>
Cc: stable <stable@vger.kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Alan Stern
2012-01-04 16:36:35 -05:00
committed by Greg Kroah-Hartman
parent 1a3a026ba1
commit d8cae98cdd
1 changed files with 9 additions and 5 deletions
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14
Documentation/usb/usbmon.txt
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@@ -47,10 +47,11 @@ This allows to filter away annoying devices that talk continuously.
2. Find which bus connects to the desired device 2. Find which bus connects to the desired device
Run "cat /proc/bus/usb/devices", and find the T-line which corresponds to Run "cat /sys/kernel/debug/usb/devices", and find the T-line which corresponds
the device. Usually you do it by looking for the vendor string. If you have 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. many similar devices, unplug one and compare the two
The T-line will have a bus number. Example: /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 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 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: Manufacturer=ATEN
S: Product=UC100KM V2.00 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' 3. Start 'cat'