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Date: Thu, 12 Jul 2018 17:02:29 +0200
From: Greg KH <gregkh@...uxfoundation.org>
To: Ludovic Desroches <ludovic.desroches@...rochip.com>
Cc: linux-serial@...r.kernel.org, linux-arch@...r.kernel.org,
linux-arm-kernel@...ts.infradead.org, jslaby@...e.com,
arnd@...db.de, richard.genoud@...il.com,
nicolas.ferre@...rochip.com, alexandre.belloni@...tlin.com,
linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/3] tty/serial_core: add ISO7816 infrastructure
On Wed, Jul 11, 2018 at 03:16:36PM +0200, Ludovic Desroches wrote:
> From: Nicolas Ferre <nicolas.ferre@...rochip.com>
>
> 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@...rochip.com>
> [ludovic.desroches@...rochip.com: squash and rebase, removal of gpios, checkpatch fixes]
> Signed-off-by: Ludovic Desroches <ludovic.desroches@...rochip.com>
> ---
> 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(+)
>
> 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;
> + spin_unlock_irqrestore(&port->lock, flags);
> +
> + if (copy_to_user(iso7816, &aux, sizeof(aux)))
> + return -EFAULT;
> +
> + return 0;
> +}
> +
> +static int uart_set_iso7816_config(struct uart_port *port,
> + struct serial_iso7816 __user *iso7816_user)
> +{
> + struct serial_iso7816 iso7816;
> + int ret;
> + unsigned long flags;
> +
> + if (!port->iso7816_config)
> + return -ENOIOCTLCMD;
> +
> + if (copy_from_user(&iso7816, iso7816_user, sizeof(*iso7816_user)))
> + return -EFAULT;
> +
> + spin_lock_irqsave(&port->lock, flags);
> + ret = port->iso7816_config(port, &iso7816);
> + spin_unlock_irqrestore(&port->lock, flags);
> + if (ret)
> + return ret;
> +
> + if (copy_to_user(iso7816_user, &port->iso7816, sizeof(port->iso7816)))
> + return -EFAULT;
> +
> + return 0;
> +}
> +
> /*
> * Called via sys_ioctl. We can use spin_lock_irq() here.
> */
> @@ -1385,6 +1426,14 @@ uart_ioctl(struct tty_struct *tty, unsigned int cmd, unsigned long arg)
> case TIOCSRS485:
> ret = uart_set_rs485_config(uport, uarg);
> break;
> +
> + case TIOCSISO7816:
> + ret = uart_set_iso7816_config(state->uart_port, uarg);
> + break;
> +
> + case TIOCGISO7816:
> + ret = uart_get_iso7816_config(state->uart_port, uarg);
> + break;
> default:
> if (uport->ops->ioctl)
> ret = uport->ops->ioctl(uport, cmd, arg);
> diff --git a/include/linux/serial_core.h b/include/linux/serial_core.h
> index 06ea4eeb09ab..d6e7747ffd46 100644
> --- a/include/linux/serial_core.h
> +++ b/include/linux/serial_core.h
> @@ -137,6 +137,8 @@ struct uart_port {
> void (*handle_break)(struct uart_port *);
> int (*rs485_config)(struct uart_port *,
> struct serial_rs485 *rs485);
> + int (*iso7816_config)(struct uart_port *,
> + struct serial_iso7816 *iso7816);
> unsigned int irq; /* irq number */
> unsigned long irqflags; /* irq flags */
> unsigned int uartclk; /* base uart clock */
> @@ -253,6 +255,7 @@ struct uart_port {
> struct attribute_group *attr_group; /* port specific attributes */
> const struct attribute_group **tty_groups; /* all attributes (serial core use only) */
> struct serial_rs485 rs485;
> + struct serial_iso7816 iso7816;
> void *private_data; /* generic platform data pointer */
> };
>
> diff --git a/include/uapi/asm-generic/ioctls.h b/include/uapi/asm-generic/ioctls.h
> index 040651735662..0e5c79726c2d 100644
> --- 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
> #define TIOCGPTN _IOR('T', 0x30, unsigned int) /* Get Pty Number (of pty-mux device) */
> #define TIOCSPTLCK _IOW('T', 0x31, int) /* Lock/unlock Pty */
> #define TIOCGDEV _IOR('T', 0x32, unsigned int) /* Get primary device node of /dev/console */
> diff --git a/include/uapi/linux/serial.h b/include/uapi/linux/serial.h
> index 3fdd0dee8b41..93eb3c496ff1 100644
> --- a/include/uapi/linux/serial.h
> +++ b/include/uapi/linux/serial.h
> @@ -132,4 +132,21 @@ struct serial_rs485 {
> are a royal PITA .. */
> };
>
> +/*
> + * Serial interface for controlling ISO7816 settings on chips with suitable
> + * support. Set with TIOCSISO7816 and get with TIOCGISO7816 if supported by
> + * your platform.
> + */
> +struct serial_iso7816 {
> + __u32 flags; /* ISO7816 feature flags */
> +#define SER_ISO7816_ENABLED (1 << 0)
> +#define SER_ISO7816_T_PARAM (0x0f << 4)
> +#define SER_ISO7816_T(t) (((t) & 0x0f) << 4)
> + __u32 tg;
> + __u32 sc_fi;
> + __u32 sc_di;
> + __u32 clk;
> + __u32 reserved[5];
You need to verify that reserved[] is all set to 0, otherwise people
will put crud in there and you can never use it for anything in the
future.
thanks,
greg k-h
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