The TP-Link TL-WR703N router is great for hacking, but its USB port is not 100% reliable. From time to time, the router loses the USB connection, and cannot enumerate the connected device(s) anymore. In such a state, the only way to get the USB back is to physically disconnect the USB device(s), which could be an issue if you have no easy access to the router.
This driver adds a SYSFS entry allowing to control the USB power switch GPIO. This gives the ability to either reset the USB port remotely, or to let the router do it by itself if it detects that something goes wrong.
In order to build this driver as an OpenWrt package and/or add it to an OpenWrt firmware build:
- checkout an OpenWrt build tree (only tested on Barrier Breaker 14.07 so far)
- move this folder to openwrt/package/kernel/usb-power
Now, if you run $ make menuconfig from the openwrt root folder, you should see an usb-power entry in the Kernel modules/Other modules sub-menu.
Just select it as built-in or package, and launch a build.
Once registered, this driver adds the following sysfs entry:
- /sys/devices/platform/usb-power.0/value
Write 0 in it to disable the USB power switch, and write 1 to re-enable it.
This driver is distributed under the GPLv2 license. See the LICENSE file for more information.
This driver has been successfully tested on a TP-Link TL-WR703N router running OpenWrt.
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Copyright (C) 2016 Jean-Christophe Rona