On 2008-08-07, Laurent Pinchart <laurentp@xxxxxxxxxxxxxxxxx> wrote:
>> From what I can gather through the man pages it seems inappropriate to
>> add this to termios cflag, though the CRTSCTS flag does set a precedent.
>> I'm an advocate of the idea of introducing a new IOCTL for setting up
>> non standard hand-shaking settings. I would suggest that things that
>> should be considered in the interface are settings for lead-in and
>> lead-out timing on the direction line (for the use of radio modems for
>> example) and means to specify if it's appropriate to have the CPU spin
>> on the shift register empty flag on the last byte of a block, if RTS
>> timing really is that critical.
>
> I don't think we want to introduce software emulation, but
> feel free to prove me wrong.
I think that should be left up to the author of the driver. It
seems to me that it would be pretty difficult to do a decent
job of it at the line-discipline layer. If the author of the
driver for a particular UART wants to do SW emulation of
auto-RTS, then I think that's where it belongs. Only the UART
driver knows whether there's a shift-register empty interrupt
(and whether that interrupt happens before or after that final
stop bit has been transmitted).
--
Grant Edwards grante Yow! I KAISER ROLL?!
at What good is a Kaiser Roll
visi.com without a little COLE SLAW
on the SIDE?
--
To unsubscribe from this list: send the line "unsubscribe linux-serial" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
