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

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Date:   Mon, 18 Jun 2018 11:22:04 +0300
From:   Felipe Balbi <balbi@...nel.org>
To:     Marcus Folkesson <marcus.folkesson@...il.com>
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,

Marcus Folkesson <marcus.folkesson@...il.com> writes:
> Hi Felipe,
>
> Should I send out v4 or what do you think?

sorry for the delay, have been busy with other tasks.

> 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.

can we use existing open source applications without modification by
accepting this glue layer?

-- 
balbi

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