Re: [PATCH v3 1/3] usb: gadget: ccid: add support for USB CCID Gadget Device
From: Marcus Folkesson
Date: Fri Jun 08 2018 - 14:54:56 EST
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@xxxxxxxxx> 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@xxxxxxxxx>
> > 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