serial_core: Handle TIOC[GS]RS485 ioctls.

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>

1 files changed, 45 insertions, 0 deletions

diff --git a/drivers/tty/serial/serial_core.c b/drivers/tty/serial/serial_core.c
index c5fb08cfbdb1..ab4db1dcc474 100644
--- a/drivers/tty/serial/serial_core.c
+++ b/drivers/tty/serial/serial_core.c
@@ -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;