While not answering your question - this may solve your problem... You can cut power to usb device by something like this:
echo suspend > /sys/bus/usb/devices/usb1/power/level That way, you could just make sure that nothing draws power regardless of plugged in or not. It could save you from unplugging stuff manually based on some message. Hope it helps, Tomas On Mon, Jan 22, 2024, 15:12 Vince Winter <[email protected]> wrote: > We are running power testing and we need to make sure their isn't USB > device plugged in it adds to the total system power by having the USB port > activate. > > I am trying to do a automated is USB plugged. > > We are using multiple generations of systems that are regularly > reinstalled. > > > On Mon, Jan 22, 2024, 9:42 AM Russell Senior <[email protected]> > wrote: > > > I don't quite understand. You are looking for a specific device? How do > you > > identify the device? > > > > On Mon, Jan 22, 2024 at 9:35 AM Vince Winter <[email protected] > > > > wrote: > > > > > I need if USB device is plugged to not to continue the rest of the > script > > > across multiple devices. I can't change every device and I am trying to > > > eliminate humans looking at which devices are plugged in. > > > > > > I do conceded that many laptop cameras are USB and Bluetooth generally > > runs > > > on the USB bus. > > > > > > I have yet to find a good answer to this myself. > > > > > > On Fri, Jan 19, 2024, 3:54 PM Russell Senior < > [email protected]> > > > wrote: > > > > > > > Two things I will mention: lsusb and udev rules. > > > > > > > > I have a set of udev rules that match ttyusb devices by path (they > > don't > > > > implement serial numbers, which would be better) and give them a > > > > consistently named symlink. I use /dev/ttyRn, where n is a whole > > number. > > > > That means no matter what order they are enumerated in, I can find > the > > > > device. > > > > > > > > I don't know if that helps with your problem or not, but I have found > > > them > > > > to be useful in adjacent problems. > > > > > > > > -- > > > > Russell > > > > > > > > On Fri, Jan 19, 2024, 15:17 Vince Winter <[email protected] > > > > > > wrote: > > > > > > > > > Hello, > > > > > > > > > > I am trying to write a bash script to detect if USB device is > plugged > > > > into > > > > > a device and post a message with a device name that is plugged to > > > stdout. > > > > > > > > > > Complications are USB webcams, USB controllers, and this is going > to > > be > > > > > used on large number of systems, so I can't customize to each > system. > > > > > > > > > > > > > > >
