On 03/04/12 20:07, Joakim Tjernlund wrote:
Rupesh Gujare<rgujare@xxxxxxxxxxxxxxx> wrote on 2012/04/03 19:31:18:
On 03/04/12 17:56, Joakim Tjernlund wrote:
Rupesh Gujare<rgujare@xxxxxxxxxxxxxxx> wrote on 2012/04/03 17:09:50:
On 03/04/12 15:39, Joakim Tjernlund wrote:
We are just starting to look into the USB protocol and so got a question.
We will have an USB HOST with a builtin USB hub with many ports and we need to find out which
physical port an device is attached to. Is this possible? Does Linux support retrieving
this port information?
Jocke
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$sudo lsusb -v
$sudo lsusb -t
Tried that but I don't quite get it. I can see
Hub Port Status:
Port 1: 0000.0100 power
Port 2: 0000.0100 power
Port 3: 0000.0100 power
Port 4: 0000.0100 power
Port 5: 0000.0303 lowspeed power enable connect
Port 6: 0000.0100 power
But I cannot match 0000.0303 to a device. Can you give me an example?
Jocke
Did you tried $lsusb -t
Yes, but mine look:
lsusb -t
Bus# 2
`-Dev# 1 Vendor 0x1d6b Product 0x0002
`-Dev# 2 Vendor 0x8087 Product 0x0024
Bus# 1
`-Dev# 1 Vendor 0x1d6b Product 0x0002
`-Dev# 2 Vendor 0x8087 Product 0x0024
`-Dev# 3 Vendor 0x03f0 Product 0x0024
Following is output when I connect USB mass storage drive on port 4. :-
$ sudo lsusb -t
/: Bus 02.Port 1: Dev 1, Class=root_hub, Driver=ehci_hcd/2p, 480M
|__ Port 1: Dev 2, If 0, Class=hub, Driver=hub/6p, 480M
|__ Port 4: Dev 5, If 0, Class=stor., Driver=usb-storage, 480M
hmm, wonder what the problem might be. I got:
lsusb -V
lsusb (usbutils) 004
Jocke
$lsusb -V
lsusb (usbutils) 001
Which kernel version & linux distribution are you working on ?
If you are on older one moving to newer version might help.
Can you find following device tree ?
/sys/bus/usb/devices/
If I remember correctly 'lsusb' will read USB device information from
above tree.
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Regards,
Rupesh Guajre
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