serial: 8250: Expose set_ldisc function

Expose set_ldisc() function so that it can be overridden with a
platform specific implementation.

Signed-off-by: Ed Blake <ed.blake@imgtec.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

4 files changed, 19 insertions, 2 deletions

diff --git a/drivers/tty/serial/8250/8250_core.c b/drivers/tty/serial/8250/8250_core.c
index 13d04bf9547d..61569a765d9e 100644
--- a/drivers/tty/serial/8250/8250_core.c
+++ b/drivers/tty/serial/8250/8250_core.c
@@ -830,6 +830,7 @@ static int serial8250_probe(struct platform_device *dev)
                 uart.port.handle_irq    = p->handle_irq;
                 uart.port.handle_break  = p->handle_break;
                 uart.port.set_termios   = p->set_termios;
+                uart.port.set_ldisc     = p->set_ldisc;
                 uart.port.get_mctrl     = p->get_mctrl;
                 uart.port.pm            = p->pm;
                 uart.port.dev           = &dev->dev;
@@ -1023,6 +1024,8 @@ int serial8250_register_8250_port(struct uart_8250_port *up)
                 /*  Possibly override set_termios call */
                 if (up->port.set_termios)
                         uart->port.set_termios = up->port.set_termios;
+                if (up->port.set_ldisc)
+                        uart->port.set_ldisc = up->port.set_ldisc;
                 if (up->port.get_mctrl)
                         uart->port.get_mctrl = up->port.get_mctrl;
                 if (up->port.set_mctrl)
diff --git a/drivers/tty/serial/8250/8250_port.c b/drivers/tty/serial/8250/8250_port.c
index 4a326034c51b..fe4399b41df6 100644
--- a/drivers/tty/serial/8250/8250_port.c
+++ b/drivers/tty/serial/8250/8250_port.c
@@ -2693,8 +2693,7 @@ serial8250_set_termios(struct uart_port *port, struct ktermios *termios,
                 serial8250_do_set_termios(port, termios, old);
 }
 
-static void
-serial8250_set_ldisc(struct uart_port *port, struct ktermios *termios)
+void serial8250_do_set_ldisc(struct uart_port *port, struct ktermios *termios)
 {
         if (termios->c_line == N_PPS) {
                 port->flags |= UPF_HARDPPS_CD;
@@ -2710,7 +2709,16 @@ serial8250_set_ldisc(struct uart_port *port, struct ktermios *termios)
                 }
         }
 }
+EXPORT_SYMBOL_GPL(serial8250_do_set_ldisc);
 
+static void
+serial8250_set_ldisc(struct uart_port *port, struct ktermios *termios)
+{
+        if (port->set_ldisc)
+                port->set_ldisc(port, termios);
+        else
+                serial8250_do_set_ldisc(port, termios);
+}
 
 void serial8250_do_pm(struct uart_port *port, unsigned int state,
                       unsigned int oldstate)
diff --git a/include/linux/serial_8250.h b/include/linux/serial_8250.h
index 04185e03d7be..61fbb440449c 100644
--- a/include/linux/serial_8250.h
+++ b/include/linux/serial_8250.h
@@ -36,6 +36,8 @@ struct plat_serial8250_port {
         void            (*set_termios)(struct uart_port *,
                                        struct ktermios *new,
                                        struct ktermios *old);
+        void            (*set_ldisc)(struct uart_port *,
+                                     struct ktermios *);
         unsigned int    (*get_mctrl)(struct uart_port *);
         int             (*handle_irq)(struct uart_port *);
         void            (*pm)(struct uart_port *, unsigned int state,
@@ -149,6 +151,8 @@ extern int early_serial8250_setup(struct earlycon_device *device,
                                          const char *options);
 extern void serial8250_do_set_termios(struct uart_port *port,
                 struct ktermios *termios, struct ktermios *old);
+extern void serial8250_do_set_ldisc(struct uart_port *port,
+                                    struct ktermios *termios);
 extern unsigned int serial8250_do_get_mctrl(struct uart_port *port);
 extern int serial8250_do_startup(struct uart_port *port);
 extern void serial8250_do_shutdown(struct uart_port *port);
diff --git a/include/linux/serial_core.h b/include/linux/serial_core.h
index 344201437017..5d494888a612 100644
--- a/include/linux/serial_core.h
+++ b/include/linux/serial_core.h
@@ -123,6 +123,8 @@ struct uart_port {
         void                    (*set_termios)(struct uart_port *,
                                                struct ktermios *new,
                                                struct ktermios *old);
+        void                    (*set_ldisc)(struct uart_port *,
+                                             struct ktermios *);
         unsigned int            (*get_mctrl)(struct uart_port *);
         void                    (*set_mctrl)(struct uart_port *, unsigned int);
         int                     (*startup)(struct uart_port *port);