linux-kernel - Re: [PATCH v2 1/3] usb: gadget: ccid: add support for USB CCID Gadget Device

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Date:   Mon, 28 May 2018 09:04:51 +0200
From:   Andrzej Pietrasiewicz <andrzej.p@...sung.com>
To:     Marcus Folkesson <marcus.folkesson@...il.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Jonathan Corbet <corbet@....net>,
        Felipe Balbi <balbi@...nel.org>, 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>
Cc:     linux-usb@...r.kernel.org, linux-doc@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 1/3] usb: gadget: ccid: add support for USB CCID
 Gadget Device

Mi Marcus,

W dniu 26.05.2018 o 23:19, Marcus Folkesson pisze:
> 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>
> ---

>   
> +config USB_CONFIGFS_CCID
> +	bool "Chip Card Interface Device (CCID)"
> +	depends on USB_CONFIGFS
> +	select USB_F_CCID
> +	help
> +	  The CCID function driver provides generic emulation of a
> +	  Chip Card Interface Device (CCID).
> +
> +	  You will need a user space server talking to /dev/ccidg*,
> +	  since the kernel itself does not implement CCID/TPDU/APDU
> +	  protocol.

Your function needs a userspace daemon to work.
It seems you want to use FunctionFS for such a purpose
instead of creating a new function.

Andrzej