Thank you Greg for your reply :) it's such an honor to speak with you :) > You could, but then you would not be a cdc-acm device, right? that would not be a problem. I just need to send and receive data between my usb gadget and chrome. >Why not just disconnect the driver from the device when you want to grab > it instead? You can do that in userspace just fine, and I think libusb > even has a function for it. That's what I did to test that everything was working on the device side. I would prefer that the user wouldn't have to install/do anything to make it work. USB should be plug and play, WebUSB even more so. > I thought that was what webusb did already, odd that it's not working > for you. Have you tried talking to the webusb developers for the > browser you are using? the motivation behind this is that WebUSB should help support new devices, not devices already in use by the OS. If I could trick the OS not to load the device, then WebUSB would work without modifications. On Tue, Feb 6, 2018 at 11:41 PM, Greg KH <gregkh@xxxxxxxxxxxxxxxxxxx> wrote: > On Tue, Feb 06, 2018 at 11:31:40PM +0100, Alberto Esposito wrote: >> Hello everybody! >> >> I'm trying to connect to a serial interface created with usb gadget >> driver via WebUSB. >> >> I was successful in setting up the serial interface, but WebUSB >> refuses to work because it can't claim the interface, since it's busy. >> >> The culprit is the cdc-acm driver, which correctly see the interface >> and claims it first. >> >> How can I prevent the cdc-acm driver from claiming the interface, >> without modifications to the client? > > Sorry, you can't. > >> Can I change the interface descriptors somehow, so that cdc-acm >> doesn't recognize the device anymore? > > You could, but then you would not be a cdc-acm device, right? > >> Or maybe I have to create a new device type in the usb gadget driver, >> to cover this specific case? > > Why not just disconnect the driver from the device when you want to grab > it instead? You can do that in userspace just fine, and I think libusb > even has a function for it. > > I thought that was what webusb did already, odd that it's not working > for you. Have you tried talking to the webusb developers for the > browser you are using? > > thanks, > > greg k-h -- 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
