linux-kernel - Re: How do I choose an arbitrary minor number for my tty device?

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Message-ID: <20101118175832.GA4931@suse.de>
Date:	Thu, 18 Nov 2010 09:58:32 -0800
From:	Greg KH <gregkh@...e.de>
To:	Timur Tabi <timur@...escale.com>
Cc:	Arnd Bergmann <arnd@...db.de>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Scott Wood <scottwood@...escale.com>,
	Stuart Yoder <stuart.yoder@...escale.com>
Subject: Re: How do I choose an arbitrary minor number for my tty device?

On Thu, Nov 18, 2010 at 11:38:07AM -0600, Timur Tabi wrote:
> Greg KH wrote:
> 
> > No, you can use the /dev/serial/ links to determine exactly which is
> > which depending on the pci id, and other unique identifiers (serial
> > numbers, etc.)
> 
> I just booted a Linux kernel with the driver I just emailed you, and there's no
> /dev/serial/ directory.  The only directories under /dev/ are 'shm' and 'pts',
> both of which are empty.

Then plug in a serial port device and see what happens.  You didn't hook
everything up in your driver correctly it seems, do your devices show up
under /sys/class/tty?

> I'm also running a Fedora 13 x86 system, just to see if I need a full modern OS
> to see these files.  Again, there is no /dev/serial/, even though I have serial
> ports.

Dynamic ones like a usb to serial device?

> Also not that since I'm not registering the byte channels as serial devices, I
> wouldn't expect anything in /dev/serial/ to reference them.
> 
> What does my driver need to do in order for these /dev/xxxx/ entries to contain
> that information?

See the udev rules for details.

> > Is this somehow not public code?  What just changed in the past 15
> > minutes?
> 
> Sorry, when I said "not public", I didn't mean it in a legal sense.  Now that I
> think about it, I guess that doesn't make much sense.

Yes, it didn't :)
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