--- On Fri, 6/11/10, Jon Povey <Jon.Povey@xxxxxxxxxxxxxxx> wrote: > > Date: Friday, June 11, 2010, 2:55 AM > I am trying to get a system working > with the gadget serial driver, I need userland apps to > change behaviour when connected to a PC (and enumerated). > The driver detects this event and prints a message, but no > hotplug event fires. The tty is created at driver load time > (i.e. on boot). > > Is there some way I can / should be detecting this event > from userland? Maybe some kind of ioctl on the gadget serial tty? It should work the same was as on a Real UART(tm), whatever that is ... when the handshaking signals are activated by the host, it shouldn't matter whether the link uses USB or RS232 signaling. > Also, I was getting a WARNING backtrace (pasted below) as > soon as I sent data into the linux box until I found this in > the archives: > > http://lkml.indiana.edu/hypermail/linux/kernel/0906.2/03650.html > > I commented out the "low_latency = 1" in gadget/u_serial.c > and the problem seems to have gone away. > > WARNING: at kernel/mutex.c:207 Yeah, the rules for use of that flag "evolved", but nobody patched that driver. -- 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
