linux-kernel - Re: [PATCH] NFC: Driver for Inside Secure MicroRead NFC chip

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Message-ID: <20110329125931.21a69776@lxorguk.ukuu.org.uk>
Date:	Tue, 29 Mar 2011 12:59:31 +0100
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	Arnd Bergmann <arnd@...db.de>
Cc:	Waldemar.Rymarkiewicz@...to.com, sameo@...ux.intel.com,
	linux-i2c@...r.kernel.org, linux-kernel@...r.kernel.org,
	hthebaud@...idefr.com, matti.j.aaltonen@...ia.com
Subject: Re: [PATCH] NFC: Driver for Inside Secure MicroRead NFC chip

> The difference between the two is where you keep the common
> NFC logic:

I think I'd disagree on that
> 
> If you have a character device, it will be like a serial port
> connecting to a modem. Any higher-level protocols live in the
> user space and are limited to a single application then, which
> is required to have appropriate priviledges to open the device.

A socket is just an API just as a file, you can put the stack in either
place in either case.

> character device is its simplicity, so that would be preferred
> if you only expect a very small set of possible applications
> for this.

NFC is not particularly performance dependant so having a lot of the
stack in a daemon isn't really going to hurt anything too much on a
client embedded device/phone.

The bigger question is probably what it needs to look like the other end
- ie the server side embedded devices doing transactions.
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