On Mon, 23 Nov 2009, Thomas Søhus wrote: > Dear experts, > > I am currently working on a project using the Gadget serial driver, and is > having some issues coping with cable removal. I need to stop my data > transmission (when the host disconnects) and restart it when the host > connects again. I would expect that you can get some sort of event from the > Gadget driver when the host is connected/disconnected, but was not able to > find any info on that. > > What I would ultimately like to accomplish: > 1. Receive events on cable insertion/removal (Host connect/disconnect). In theory events could be generated for connect and disconnect. However none of the device controller drivers or gadget drivers does so. > 2. Receive events when the host is ready to receive data (the Port is opened > on the host PC). There is no way to find out when this happens. The host doesn't tell the device when the port is opened or closed. > Is it possible to receive such events in user mode from the Gadget stack or > the USB sub-system? > If not could you provide some advice on possible workaround to solve my > problem? You could modify the composite_disconnect() routine in composite.c to provide some notification when a disconnection occurs. You could even make a similar change to composite_setup() to create an event the first time a control request is received following a disconnect -- that would correspond to a connection. 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
