On Wed, Aug 25, 2010 at 10:37:44AM -0400, Dave Mielke wrote: > [quoted lines by Alan Stern on 2010/08/24 at 10:22 -0400] > > >If I understand correctly, the problem is that the ftdi_sio devices now > >_do_ behave like real serial ports, and this confuses programs that > >expect them to behave differently (as they used to). > > Yes, exactly. > > By the way: I got tired of saying "I believe that ...", and I also suspect that > others aren't sure how a real serial port works, so I tested it. Here's the way > they work. > > The termios flags of interest are CLOCAL and CRTSCTS. Both of them retain their > states from device close to device open. > > The modem lines of interest are DTR and RTS. Changing CLOCAL and/or CRTSCTS has > absolutely no effect on their current states. What does matter, though, is that > both DTR and RTS are always raised when the device is opened, regardless of the > states of CLOCAL and CRTSCTS. Ok, so what is broken in the existing driver in this respect? Does it not follow this properly? 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
