linux-kernel - Re: [PATCH v3 1/3] usb: gadget: ccid: add support for USB CCID Gadget Device

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Message-ID: <20180608185443.GB874@gmail.com>
Date:   Fri, 8 Jun 2018 20:54:43 +0200
From:   Marcus Folkesson <marcus.folkesson@...il.com>
To:     Felipe Balbi <balbi@...nel.org>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Jonathan Corbet <corbet@....net>, davem@...emloft.net,
        Mauro Carvalho Chehab <mchehab+samsung@...nel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Randy Dunlap <rdunlap@...radead.org>,
        Ruslan Bilovol <ruslan.bilovol@...il.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Kate Stewart <kstewart@...uxfoundation.org>,
        linux-usb@...r.kernel.org, linux-doc@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 1/3] usb: gadget: ccid: add support for USB CCID
 Gadget Device

Hi Felipe,

Should I send out v4 or what do you think?

On Wed, May 30, 2018 at 04:04:15PM +0200, Marcus Folkesson wrote:
> Hi Filipe,
> 
> On Wed, May 30, 2018 at 03:28:18PM +0300, Felipe Balbi wrote:
> > Marcus Folkesson <marcus.folkesson@...il.com> writes:
> > 
> > > Chip Card Interface Device (CCID) protocol is a USB protocol that
> > > allows a smartcard device to be connected to a computer via a card
> > > reader using a standard USB interface, without the need for each manufacturer
> > > of smartcards to provide its own reader or protocol.
> > >
> > > This gadget driver makes Linux show up as a CCID device to the host and let a
> > > userspace daemon act as the smartcard.
> > >
> > > This is useful when the Linux gadget itself should act as a cryptographic
> > > device or forward APDUs to an embedded smartcard device.
> > >
> > > Signed-off-by: Marcus Folkesson <marcus.folkesson@...il.com>
> > 
> > this could be done entirely in userspace with functionfs, why do we need
> > this part in the kernel? It does very little.
> 
> Andrzej pointed this out, and I actually do not have any good answer
> more than that the userspace application could be kept small and the
> important configuration of the CCID device is done with well (I hope)
> documented configfs attributes.
> 
> > 
> > -- 
> > balbi
> 
> Best regards,
> Marcus Folkesson
> 
> 

Thank you,
Marcus Folkesson