On Mon, Mar 05, 2012 at 11:37:54PM +0000, tilman wrote: > > > What function does a userspace program use to set serial device > > > parameter like baudrate,etc. ? > > > > The "normal" calls? Have you read the Serial Port HOWTO for how to do > > this properly from userspace? That should help you out here. > yes, several. > > This is what the user program does: > fdtx = open( deviceFileName, O_RDWR); > tcgetattr(fdtx,&oldtermios); > close(fdtx); > > And this is what I am seing in the system log, i.e. a call to ioctl with TCGETS > as argument: > drivers/usb/serial/usbrsa.c: usbrsa_open > drivers/usb/serial/usbrsa.c: send_reset > drivers/usb/serial/usbrsa.c: usbrsa_ioctl() cmd 0x5401 (TCGETS) > drivers/usb/serial/usbrsa.c: usbrsa_chars_in_buffer(): 0 > drivers/usb/serial/usbrsa.c: usbrsa_close - port 1 > drivers/usb/serial/usbrsa.c: usbrsa_baudrate_lcr_callback() > drivers/usb/serial/usbrsa.c: usbrsa_status_callback(): reading stopped: > tx_free=4096;rx_recv=0 > > Not sure how to debug this. Is there some sort of configuration of the tty layer > by the driver required ? I understood that tcgetattr should result in a call to > tiocmget... If you set up the line discipline correctly, it shouldn't be called. Do you have a pointer to the source for this driver? I don't see it in my trees anywhere. That might be the easiest thing to help debug this. 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
