From: Peter Favrholdt <[email protected]>
I'm using a 2 port USB RS232 dongle to connect to a serial-IR cradle for
a bar code reader). Detecting the baudrate of the serial-IR involves
keeping DTR low while changing baudrate.
This works using normal 16550A serial ports as well as the FTDI driver
version 1.4.0 (Linux 2.6.8) but stopped working with the change to
"ensure RTS and DTR are raised when changing baudrate" introduced in
version 1.4.1 (Linux 2.6.9).
The attached patch fixes this, so RTS and DTR is only raised when
changing baudrate iff the previous baudrate was B0.
Signed-off-by: Peter Favrholdt <[email protected]>
Signed-off-by: Ian Abbott <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
---
drivers/usb/serial/ftdi_sio.c | 8 +++++---
1 file changed, 5 insertions(+), 3 deletions(-)
--- scsi-2.6.orig/drivers/usb/serial/ftdi_sio.c 2005-09-20 06:00:04.000000000 -0700
+++ scsi-2.6/drivers/usb/serial/ftdi_sio.c 2005-09-21 17:29:41.000000000 -0700
@@ -1846,10 +1846,12 @@
} else {
/* set the baudrate determined before */
if (change_speed(port)) {
- err("%s urb failed to set baurdrate", __FUNCTION__);
+ err("%s urb failed to set baudrate", __FUNCTION__);
+ }
+ /* Ensure RTS and DTR are raised when baudrate changed from 0 */
+ if ((old_termios->c_cflag & CBAUD) == B0) {
+ set_mctrl(port, TIOCM_DTR | TIOCM_RTS);
}
- /* Ensure RTS and DTR are raised */
- set_mctrl(port, TIOCM_DTR | TIOCM_RTS);
}
/* Set flow control */
--
-
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