Messages in this thread | | | Date | Thu, 19 Jul 2018 12:07:05 +0100 | From | Alan Cox <> | Subject | Re: [PATCH 1/3] tty/serial_core: add ISO7816 infrastructure |
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> > > > > + if (!port->iso7816_config) > > > + return -ENOIOCTLCMD; > > > > Why this error value? > > > > It was a mimic of RS485.
Which is what you want - it means the upper tty layer knows to offer the ioctl to other places and then return appropriately.
Alan
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