Hi,
some time ago (in October 2007) I suggested to either extend the
usb-serial-drivers to support mark/space parity, or fix the drivers
so they reject the mark/space parity setting.
It seems that they now reject mark/space parity.
But since most (if not all) of the usb-serial-converters do support
mark+space parity, here's a patch for the ftdi_sio-driver (for kernel
2.6.31), which adds support for mark+space parity.
It would be probably good to add this mark+space parity support also to
the other usb-serial-drivers, and I think patches for the other drivers
would look *very* similar, but I don't know them in detail.
Please tell me if there are any problems with this patch or if you have
any questions.
regards,
Roland
diff -Naur linux-2.6.31/drivers/usb/serial/ftdi_sio.c linux-2.6.31_ftdi-markspace/drivers/usb/serial/ftdi_sio.c
--- linux-2.6.31/drivers/usb/serial/ftdi_sio.c 2009-09-10 00:13:59.000000000 +0200
+++ linux-2.6.31_ftdi-markspace/drivers/usb/serial/ftdi_sio.c 2009-09-17 18:33:00.000000000 +0200
@@ -2353,14 +2353,15 @@
/* Set number of data bits, parity, stop bits */
- termios->c_cflag &= ~CMSPAR;
-
urb_value = 0;
urb_value |= (cflag & CSTOPB ? FTDI_SIO_SET_DATA_STOP_BITS_2 :
FTDI_SIO_SET_DATA_STOP_BITS_1);
urb_value |= (cflag & PARENB ?
+ (cflag & CMSPAR ?
+ (cflag & PARODD ? FTDI_SIO_SET_DATA_PARITY_MARK :
+ FTDI_SIO_SET_DATA_PARITY_SPACE) :
(cflag & PARODD ? FTDI_SIO_SET_DATA_PARITY_ODD :
- FTDI_SIO_SET_DATA_PARITY_EVEN) :
+ FTDI_SIO_SET_DATA_PARITY_EVEN)) :
FTDI_SIO_SET_DATA_PARITY_NONE);
if (cflag & CSIZE) {
switch (cflag & CSIZE) {
