On Wed, Jul 11, 2018 at 03:16:36PM +0200, Ludovic Desroches wrote: > From: Nicolas Ferre <nicolas.ferre@xxxxxxxxxxxxx> > > Add the ISO7816 ioctl and associated accessors and data structure. > Drivers can then use this common implementation to handle ISO7816. > > Signed-off-by: Nicolas Ferre <nicolas.ferre@xxxxxxxxxxxxx> > [ludovic.desroches@xxxxxxxxxxxxx: squash and rebase, removal of gpios, checkpatch fixes] > Signed-off-by: Ludovic Desroches <ludovic.desroches@xxxxxxxxxxxxx> > --- > drivers/tty/serial/serial_core.c | 49 +++++++++++++++++++++++++++++++++++++++ > include/linux/serial_core.h | 3 +++ > include/uapi/asm-generic/ioctls.h | 2 ++ > include/uapi/linux/serial.h | 17 ++++++++++++++ > 4 files changed, 71 insertions(+) Note, kbuild found build issues with this, please fix up. Also, here's some comments: > > diff --git a/drivers/tty/serial/serial_core.c b/drivers/tty/serial/serial_core.c > index 9c14a453f73c..c89ac59f6f8c 100644 > --- a/drivers/tty/serial/serial_core.c > +++ b/drivers/tty/serial/serial_core.c > @@ -1301,6 +1301,47 @@ static int uart_set_rs485_config(struct uart_port *port, > return 0; > } > > +static int uart_get_iso7816_config(struct uart_port *port, > + struct serial_iso7816 __user *iso7816) > +{ > + unsigned long flags; > + struct serial_iso7816 aux; > + > + spin_lock_irqsave(&port->lock, flags); > + aux = port->iso7816; Don't you want to check to see if there is a function for iso7816 before copying it? Otherwise it's just empty, right? > + if (!port->iso7816_config) > + return -ENOIOCTLCMD; Why this error value? > --- a/include/uapi/asm-generic/ioctls.h > +++ b/include/uapi/asm-generic/ioctls.h > @@ -66,6 +66,8 @@ > #ifndef TIOCSRS485 > #define TIOCSRS485 0x542F > #endif > +#define TIOCGISO7816 0x5430 > +#define TIOCSISO7816 0x5431 Where did you get these numbers from? thanks, greg k-h