This application can be used to perform resets on USB devices. This README describes the steps to compile, run, and then automate execution of this application to reset a USB wireless adapter with a greater degree of authority than is available using ifdown wlan0
/ifup wlan0
.
Credit to Alan Stern for developing this program, as retrieved from: http://marc.info/?l=linux-usb&m=121459435621262&w=2
A couple of deb packages have been built as releases in this repo
The following sequence is adequate to execute the program:
-
Compile the program:
cc usbreset.c -o usbreset
-
Set the permissions on the executable:
chmod +x usbreset
-
Get the Bus and Device ID of the USB device you want to reset:
lsusb
which provides output:
Bus 001 Device 007: ID 050d:945a Belkin Components F7D1101 v1 Basic Wireless Adapter [Realtek RTL8188SU] Bus 001 Device 003: ID 0403:6014 Future Technology Devices International, Ltd FT232H Single HS USB-UART/FIFO IC Bus 001 Device 002: ID 0bc2:5031 Seagate RSS LLC FreeAgent GoFlex USB 3.0 Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub Bus 002 Device 002: ID 046d:c06b Logitech, Inc. G700 Wireless Gaming Mouse Bus 002 Device 003: ID 413c:2106 Dell Computer Corp. Dell QuietKey Keyboard Bus 002 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
where the device of interest is on Bus 001 identified as Device 007 (our USB wireless adapter).
-
Execute the program with sudo privilege or as the root user, making necessary substitution for with the
Bus
andDevice
ids as found by running the lsusb command:sudo ./usbreset /dev/bus/usb/Bus/Device
or in our case
sudo ./usbreset /dev/bus/usb/001/007
Now, we can automate execution with the following inline Perl command (assuming that
usbreset
is in the $PATH): -
Execute or embed in a script:
echo $(lsusb | grep "Wireless Adapter"); wifipath=$( lsusb | grep "Wireless Adapter" | perl -nE "/\D+(\d+)\D+(\d+).+/; print qq(\$1/\$2)") sudo usbreset /dev/bus/usb/$wifipath
which was inspired by the code provided by knb at http://askubuntu.com/questions/645/how-do-you-reset-a-usb-device-from-the-command-line