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Finding the Kernel Driver(s) The victim device $ lsusb Bus 010 Device 002: ID 046d:c01e Logitech, Inc. MX518 Optical Mouse Bus 010 Device 003: ID 051d:0002 American Power Conversion Uninterruptible Power Supply We're going to try to find out what driver is used for the APC UPS. Note that there are two answers to this question: The driver that the kernel would use, and the driver that is currently in use.
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Userspace can instruct the kernel to use a different driver (and in the case of my APC UPS, nut has). Method 1: Using usbutils (easy) The usbutils package (on Debian, at least) includes a script called usb-devices.
If you run it, it outputs information about the devices on the system, including which driver is used: $ usb-devices ⋮ T: Bus=10 Lev=01 Prnt=01 Port=01 Cnt=02 Dev#= 3 Spd=1.5 MxCh= 0 D: Ver= 1.10 Cls=00(ifc ) Sub=00 Prot=00 MxPS= 8 #Cfgs= 1 P: Vendor=051d ProdID=0002 Rev=01.06 S: Manufacturer=American Power Conversion S: Product=Back-UPS RS 1500 FW:8.g9.D USB FW:g9 S: SerialNumber=XXXXXXXXXXXX C: #Ifs= 1 Cfg#= 1 Atr=a0 MxPwr=24mA I: If#= 0 Alt= 0 #EPs= 1 Cls=03(HID ) Sub=00 Prot=00 Driver=usbfs ⋮ Note that this lists the current driver, not the default one. There isn't a way to find the default one.
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Method 2: Using debugfs (requires root) If you have debugfs mounted, the kernel maintains a file in the same format as usb-devices prints out at /sys/kernel/debug/usb/devices; you can view with less, etc. Note that debugfs interfaces are not stable, so different kernel versions may print in a different format, or be missing the file entirely.
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Once again, this only shows the current driver, not the default. Method 3: Using only basic utilities to read /sys directly (best for scripting or recovery) You can get the information out of /sys, thought its more painful than lspci. These /sys interfaces should be reasonably stable, so if you're writing a shell script, this is probably how you want to do it. Initially, lsusb seems to count devices from 1, /sys from 0. So 10-2 is a good guess for where to find the APC UPS lsusb gives as bus 10, device 3. Unfortunately, over time that mapping breaks down—sysfs re-uses numbers even when device numbers aren't. The devnum file's contents will match the device number given by lsusb, so you can do something like this: $ grep -l '^3$' /sys/bus/usb/devices/10-./devnum # the ^ and $ to prevent also matching 13, 31, etc.
/sys/bus/usb/devices/10-2/devnum So, in this case, it's definitely 10-2. Lsusb itself can get you good results. For compact output I use lsusb -t, where -t shows the devices as a tree; this format reports the driver as well. Example output: $ lsusb -t /: Bus 04.Port 1: Dev 1, Class=roothub, Driver=xhcihcd/2p, 5000M /: Bus 03.Port 1: Dev 1, Class=roothub, Driver=xhcihcd/2p, 480M /: Bus 02.Port 1: Dev 1, Class=roothub, Driver=ehci-pci/3p, 480M Port 1: Dev 2, If 0, Class=Hub, Driver=hub/8p, 480M.
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If no driver is used, the line will look like this (the device in my example is a camera for which I did remove the driver from the kernel): Port 6: Dev 4, If 1, Class=Video, Driver=, 480M.