New device wiring option

[Daniel O'Connor]

> On 15 Apr 2021, at 14:47, Poul-Henning Kamp <phk at phk.freebsd.dk> wrote:
> 
> --------
> Bjoern A. Zeeb writes:
> 
>> Probably USB as well?  Having 10 serial consoles on USB Hubs and unplugging
>> one “early” one it is easy to end up re-numbering the entire chain after a
>> reboot.  Not sure if this really fits into your problem/implementation domain.
> 
> My solution to that specific problem is the following entry in /etc/devd:
> 
> 	attach 500 {
> 		match "device-name"     "uftdi[0-9]*";
> 		match "vendor"          "0x0403";
> 		match "product"         "(0x6001|0x6015)";
> 		action "ln -fs /dev/cua$ttyname /dev/cua_$sernum";
> 	};
> 	
> 	notify 500 {
> 		match "system"          "USB";
> 		match "subsystem"       "DEVICE";
> 		match "type"            "DETACH";
> 		match "vendor"          "0x0403";
> 		match "product"         "(0x6001|0x6015)";
> 		action "rm -f /dev/cua_$sernum";
> 	};

I wrote a more general version of this, although when I did testing the serial number was not available so I had to store it for deletion later.

--
Daniel O'Connor
"The nice thing about standards is that there
are so many of them to choose from."
 -- Andrew Tanenbaum
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