From mboxrd@z Thu Jan 1 00:00:00 1970 From: Samuel Ortiz Subject: Re: [PATCH] NFC: Driver for Inside Secure MicroRead NFC chip Date: Thu, 31 Mar 2011 16:16:51 +0200 Message-ID: <20110331141650.GB2704@sortiz-mobl> References: <1300444824-13713-1-git-send-email-waldemar.rymarkiewicz@tieto.com> <20110325142648.GC3879@sortiz-mobl> <99B09243E1A5DA4898CDD8B7001114481085E2375D@EXMB04.eu.tieto.com> <201103291305.02293.arnd@arndb.de> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Return-path: Content-Disposition: inline In-Reply-To: <201103291305.02293.arnd-r2nGTMty4D4@public.gmane.org> Sender: linux-i2c-owner-u79uwXL29TY76Z2rM5mHXA@public.gmane.org To: Arnd Bergmann Cc: Waldemar.Rymarkiewicz-++hxYGjEMp0AvxtiuMwx3w@public.gmane.org, linux-i2c-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, hthebaud-Umy9UjvE/gtWk0Htik3J/w@public.gmane.org, matti.j.aaltonen-xNZwKgViW5gAvxtiuMwx3w@public.gmane.org, alan-qBU/x9rampVanCEyBjwyrvXRex20P6io@public.gmane.org List-Id: linux-i2c@vger.kernel.org On Tue, Mar 29, 2011 at 01:05:02PM +0200, Arnd Bergmann wrote: > On Tuesday 29 March 2011, Waldemar.Rymarkiewicz-++hxYGjEMp0AvxtiuMwx3w@public.gmane.org wrote: > > >Yes, NFC seems to be a good fit for a new socket family. > > >Especially if we ever want to have a proper NFC p2p support > > >from the kernel. > > >Sending HCI commands should be done through a dedicated > > >netlink socket too. > > > > > >I am currently strting to work on such solution, and I hope to > > >be able to come up with a basic prototype for it in a few weeks. > > > > What about common drivers interface in this case. > > Should we go for common /dev/nfcX interface as well? > > I fear there can only be one. A good implementation of a socket > interface would mean that there is no need for a character device. My idea of an initial NFC subsystem architecture was actually the following one: - A core NFC layer against which NFC drivers would register. - A netlink socket for handling the HCI commands. That would put a big part of the NFC HCI layer in kernel land and could potentially simplify the existing NFC stacks. - A socket family for the LLCP abstraction, a.k.a. NFC peer to peer mode. We can start working on the first 2 items and leave the last one as a future enhancement, since what NFC is currently mostly used for is tag reading/writing and smartcard emulation. Basically, we'd replace the current character device option with a netlink one, allowing for a single kernel entry point for multiple applications willing to do NFC. Cheers, Samuel. -- Intel Open Source Technology Centre http://oss.intel.com/