On Thu, Apr 02, 2020 at 09:19:06AM +0200, massimo wrote: > I've read the interesting Greg's article about writing USB driver for > Linux. > I'm interested in a simpler question. Is it possible > to write a driver in Ubuntu (19.10) to switch power on or off to a USB > port, that' s to say to give or take off the 5 volts power supply to a > USB port (in order for example to switch on or off a simple usb lamp)? > Thanks for your attention and courtesy, Massimo. > Try the userspace program 'usbreset' that is part of the usbutils package, and can be found also here: https://github.com/gregkh/usbutils/blob/master/usbreset.c if your hub supports it, this will work. Note, not all USB hubs support this type of behavior, as it is not required by the USB specification. hope this helps, greg k-h
