Re: Problem: usb-serial: parity mark,space ?

hi again,

> I noticed that nearly all usb-serial-adapters support mark and space
> parity, but unfortunately nearly none of the linux-usb-serial-drivers
> supports them.
in addition to this, most of the drivers not only don't support
mark/space parity, but *silently ignore it*. If you tell the driver
to use mark/space parity, it accepts this setting, but then uses
odd/even parity!!

such a driver should:
- either correctly support mark/space parity
- or refuse this setting.

everything else is a BUG. here's the short bugreport:


1. wrong parity-handling in usb-serial-drivers

2. most usb-serial-drivers ignore mark/space parity and silently use
odd/even parity instead, because they ignore the CMSPAR bit in
termios->c_cflag.

X. fix:
check CMSPAR in every driver.
either support it or return an error if mark/space parity is requested.

I'll submit a patch for the ftdi_sio usb-serial-driver (adding
mark/space parity).
and maybe I'll submit some patches for the other drivers rejecting
mark/space parity.


regards,
Roland


-------------------------------------------------------------------------
This SF.net email is sponsored by: Splunk Inc.
Still grepping through log files to find problems?  Stop.
Now Search log events and configuration files using AJAX and a browser.
Download your FREE copy of Splunk now >> http://get.splunk.com/
_______________________________________________
[email protected]
To unsubscribe, use the last form field at:
https://lists.sourceforge.net/lists/listinfo/linux-usb-devel