Userpace serial port

[greg@kroah.com (Greg KH)]

On Wed, Jun 10, 2015 at 02:39:35PM +0200, Ricardo Ribalda Delgado wrote:
> Hello
> 
> I have a serial port accesible via Ehtercat.
> http://www.beckhoff.dk/english.asp?ethercat/el6001.htm
> 
> Ethercat is a fancy way of accessing i/o devices via ethernet. You can
> read/write registers with close to real-time restrictions.
> 
> Nowadays there is a kernel land implementation of ethercat master, but
> it is not merged (and it is definately not an easy job). And a
> software implementation http://fh-soft.de/src/ethercat-userspace.html

Why not attempt to merge it?

> My hope is that there is something like uinput, but for serial
> devices,i.e. I make a userland program that looks like a normal serial
> device to the other applications.

A serial device that does what exactly?  What's wrong with the "normal"
serial userspace api the kernel provides?

thanks,

greg k-h