Hi Alan, On Wed, Aug 5, 2015 at 7:15 PM, Alan Stern <stern@xxxxxxxxxxxxxxxxxxx> wrote: > On Wed, 5 Aug 2015, Greg KH wrote: > >> hm, wait, is this really the n_gsm line discipline? Or is it something >> else? >> >> g_serial is the device side of a serial connection, there is no "cable >> removed" notification that it even knows about, that has to come from >> the gadget driver somehow, which you should listen for and then kick >> your userspace program. > > There is the gserial_disconnect() callback, which gets invoked when the > Vbus power (provided by the host) is removed. It's a pretty good > indicator that the USB cable has been unplugged. > > I don't understand all the stuff that gserial_disconnect() does, but it > ought to be more or less equivalent to a "hangup" -- as the kerneldoc > says. If it doesn't do what users expect, there's probably a bug > somewhere. > > Of course, it's possible that the callback does not get invoked in > Laszlo's case. Then the question would be: Why not? Hmm, that is a good question. I wonder if there had been any recent fixes for that lately... I suppose that I will need to skim through the git log. Thank you for the hints! > Alan Stern > -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
