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tty/serial_core: add ISO7816 infrastructure

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Add the ISO7816 ioctl and associated accessors and data structure.
Drivers can then use this common implementation to handle ISO7816
(smart cards).

Signed-off-by: Nicolas Ferre <[email protected]>
[[email protected]: squash and rebase, removal of gpios, checkpatch fixes]
Signed-off-by: Ludovic Desroches <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
This commit is contained in:
Nicolas Ferre 2018-09-26 14:58:47 +02:00 • committed by Greg Kroah-Hartman
commit ad8c0eaa0a
12 changed files with 179 additions and 0 deletions
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60
drivers/tty/serial/serial_core.c
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@ -1308,6 +1308,58 @@ 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;
if (!port->iso7816_config)
return -ENOIOCTLCMD;
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 i, ret;
unsigned long flags;
if (!port->iso7816_config)
return -ENOIOCTLCMD;
if (copy_from_user(&iso7816, iso7816_user, sizeof(*iso7816_user)))
return -EFAULT;
/*
* There are 5 words reserved for future use. Check that userspace
* doesn't put stuff in there to prevent breakages in the future.
*/
for (i = 0; i < 5; i++)
if (iso7816.reserved[i])
return -EINVAL;
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.
*/
@ -1392,6 +1444,14 @@ 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);