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serial_core: Handle TIOC[GS]RS485 ioctls.

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The following drivers: 8250_core, atmel_serial, max310x, mcf, omap-serial
and sci16is7xx implement code to handle RS485 ioctls.

In order to avoid code duplication, we implement a simple ioctl handler
on the serial_core layer.

This handler can be used by all the other drivers instead of duplicating
code.

Until this is the only RS485 ioctl handler, it will try first the
rs485_config callback and if it is not present it will call the driver
specific ioctl.

Reviewed-by: Alan Cox <alan@linux.intel.com>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Jiri Slaby <jslaby@suse.cz>
Signed-off-by: Ricardo Ribalda Delgado <ricardo.ribalda@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Ricardo Ribalda Delgado 2014-11-06 22:46:13 +01:00 committed by Greg Kroah-Hartman
parent 7f1dc2f384
commit a5f276f10f
2 changed files with 48 additions and 0 deletions
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45
drivers/tty/serial/serial_core.c
View File

@ -1152,6 +1152,39 @@ static int uart_get_icount(struct tty_struct *tty,
return 0;
}
static int uart_get_rs485_config(struct uart_port *port,
struct serial_rs485 __user *rs485)
{
if (!port->rs485_config)
return -ENOIOCTLCMD;
if (copy_to_user(rs485, &port->rs485, sizeof(port->rs485)))
return -EFAULT;
return 0;
}
static int uart_set_rs485_config(struct uart_port *port,
struct serial_rs485 __user *rs485_user)
{
struct serial_rs485 rs485;
int ret;
if (!port->rs485_config)
return -ENOIOCTLCMD;
if (copy_from_user(&rs485, rs485_user, sizeof(*rs485_user)))
return -EFAULT;
ret = port->rs485_config(port, &rs485);
if (ret)
return ret;
if (copy_to_user(rs485_user, &port->rs485, sizeof(port->rs485)))
return -EFAULT;
return 0;
}
/*
* Called via sys_ioctl. We can use spin_lock_irq() here.
*/
@ -1223,6 +1256,18 @@ uart_ioctl(struct tty_struct *tty, unsigned int cmd,
* protected against the tty being hung up.
*/
switch (cmd) {
case TIOCGRS485:
ret = uart_get_rs485_config(state->uart_port, uarg);
break;
case TIOCSRS485:
ret = uart_set_rs485_config(state->uart_port, uarg);
break;
}
if (ret != -ENOIOCTLCMD)
goto out;
switch (cmd) {
case TIOCSERGETLSR: /* Get line status register */
ret = uart_get_lsr_info(tty, state, uarg);
break;

3
include/linux/serial_core.h
View File

@ -131,6 +131,8 @@ struct uart_port {
void (*pm)(struct uart_port *, unsigned int state,
unsigned int old);
void (*handle_break)(struct uart_port *);
int (*rs485_config)(struct uart_port *,
struct serial_rs485 *rs485);
unsigned int irq; /* irq number */
unsigned long irqflags; /* irq flags */
unsigned int uartclk; /* base uart clock */
@ -231,6 +233,7 @@ struct uart_port {
unsigned char unused[2];
struct attribute_group *attr_group; /* port specific attributes */
const struct attribute_group **tty_groups; /* all attributes (serial core use only) */
struct serial_rs485 rs485;
void *private_data; /* generic platform data pointer */
};