linux-kernel - Re: [PATCH] usb/serial/cp2101: Add support for cp2103 GPIO pins

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Message-ID: <20081127184109.GA20479@suse.de>
Date:	Thu, 27 Nov 2008 10:41:09 -0800
From:	Greg KH <gregkh@...e.de>
To:	Keith Packard <keithp@...thp.com>
Cc:	Alan Cox <alan@...rguk.ukuu.org.uk>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] usb/serial/cp2101: Add support for cp2103 GPIO pins

On Thu, Nov 27, 2008 at 10:20:26AM -0800, Keith Packard wrote:
> On Thu, 2008-11-27 at 10:58 +0000, Alan Cox wrote:
> 
> > Only concern I have is that a custom ioctl means every time a new serial
> > chip grows GPIO pins we end up with more ioctls.
> 
> I'm not sure we'll find a lot of serial chips with GPIO pins attached...

Yes, there are a number of other ones already in use that have them.
What we have done in the past for them is just use a simple userspace
program/library that uses usbfs/libusb to access the device directly.

Can you do the same thing here as well?  Or do you also need to
send/recieve serial data through the device at the same time?

thanks,

greg k-h
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