find sysfs by id
<code bash>
$ lsusb
Bus 003 Device 003: ID 15d9:0a33  
$ pwd
/sys/devices
$ find ./ -name "*15D9:0A33*"
./pci0000:00/0000:00:1d.1/usb3/3-2/3-2:1.0/0003:15D9:0A33.0002
$ pwd
/sys/devices/pci0000:00/0000:00:1d.1/usb3/3-2/3-2:1.0
suapapa@jang 3-2:1.0 $ ls
0003:15D9:0A33.0002  bInterfaceClass   bInterfaceProtocol  bNumEndpoints  ep_81  modalias  subsystem             uevent
bAlternateSetting    bInterfaceNumber  bInterfaceSubClass  driver         input  power     supports_autosuspend  usb_endpoint

suapapa@jang 3-2:1.0 $ tree -d
.
|-- 0003:15D9:0A33.0002
|   |-- driver -> ../../../../../../../bus/hid/drivers/generic-usb
|   |-- power
|   `-- subsystem -> ../../../../../../../bus/hid
|-- driver -> ../../../../../../bus/usb/drivers/usbhid
|-- ep_81 -> usb_endpoint/usbdev3.3_ep81
|-- input
|   `-- input9
|       |-- capabilities
|       |-- device -> ../../../3-2:1.0
|       |-- event4
|       |   |-- device -> ../../input9
|       |   |-- power
|       |   `-- subsystem -> ../../../../../../../../../class/input
|       |-- id
|       |-- mouse1
|       |   |-- device -> ../../input9
|       |   |-- power
|       |   `-- subsystem -> ../../../../../../../../../class/input
|       |-- power
|       `-- subsystem -> ../../../../../../../../class/input
|-- power
|-- subsystem -> ../../../../../../bus/usb
`-- usb_endpoint
    `-- usbdev3.3_ep81
        |-- device -> ../../../3-2:1.0
        |-- power
        `-- subsystem -> ../../../../../../../../class/usb_endpoint

28 directories
suapapa@jang 3-2:1.0 $ pushd ../../../../../../bus/usb/drivers/usbhid
/sys/bus/usb/drivers/usbhid /sys/devices/pci0000:00/0000:00:1d.1/usb3/3-2/3-2:1.0
suapapa@jang usbhid $ pwd
/sys/bus/usb/drivers/usbhid
suapapa@jang usbhid $ ls
3-2:1.0  bind  module  new_id  uevent  unbind
suapapa@jang usbhid $ tree -d
.
|-- 3-2:1.0 -> ../../../../devices/pci0000:00/0000:00:1d.1/usb3/3-2/3-2:1.0
`-- module -> ../../../../module/usbhid

</code>
====== usb monitoring in win32 ======
  *[[http://groups.google.com/group/microdia/web/usb-sniffing-on-windows|usb-sniffing-on-windows]],[[http://www.pcausa.com/Utilities/UsbSnoop/|SniffUsb 2.0]]
  *[[http://sourceforge.net/projects/usbsnoop/|Usb Sniffer for Windows]]
followings are not free
  *[[http://www.hhdsoftware.com/Products/home/usb-monitor.html]]
  *[[http://www.sourcequest.com/]]


====== references ======
  *[[http://microdia.googlegroups.com/web/HowTo-sniffUSB1.8.txt|How to capture USB traffic with usbsnoop 1.8]] for use with [[http://iki.fi/lindi/darcs/usbsnoop2libusb/usbsnoop2libusb.pl|usbsnoop2libusb.pl]]
  *[[http://www.linuxjournal.com/article/7353|Writing a Simple USB Driver]]
  *[[https://microdia.googlegroups.com/web/usb-in-a-nutshell.pdf|usb-in-a-nutshell(pdf)]]
  *[[http://linuxdevcenter.com/pub/a/linux/2007/07/05/devhelloworld-a-simple-introduction-to-device-drivers-under-linux.html?page=1|/dev/hello_world: A Simple Introduction to Device Drivers under Linux]]
  *[[http://www.boot-land.net/forums/index.php?showtopic=1659|USB Vendor ID list]]