8250: allow platforms to override PM hook.

Add a hook for platforms to specify custom pm methods.

Signed-off-by: Manuel Lauss <manuel.lauss@googlemail.com>
Cc: Alan Cox <alan@lxorguk.ukuu.org.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

diff --git a/drivers/serial/8250.c b/drivers/serial/8250.c
index b586406..6994afb 100644 (file)
--- a/drivers/serial/8250.c
+++ b/drivers/serial/8250.c
@@ -154,12 +154,6 @@ struct uart_8250_port {
        unsigned char           lsr_saved_flags;
 #define MSR_SAVE_FLAGS UART_MSR_ANY_DELTA
        unsigned char           msr_saved_flags;
-
-       /*
-        * We provide a per-port pm hook.
-        */
-       void                    (*pm)(struct uart_port *port,
-                                     unsigned int state, unsigned int old);
 };
 
 struct irq_info {
@@ -2436,16 +2430,24 @@ serial8250_set_ldisc(struct uart_port *port, int new)
                port->flags &= ~UPF_HARDPPS_CD;
 }
 
-static void
-serial8250_pm(struct uart_port *port, unsigned int state,
-             unsigned int oldstate)
+
+void serial8250_do_pm(struct uart_port *port, unsigned int state,
+                     unsigned int oldstate)
 {
        struct uart_8250_port *p = (struct uart_8250_port *)port;
 
        serial8250_set_sleep(p, state != 0);
+}
+EXPORT_SYMBOL(serial8250_do_pm);
 
-       if (p->pm)
-               p->pm(port, state, oldstate);
+static void
+serial8250_pm(struct uart_port *port, unsigned int state,
+             unsigned int oldstate)
+{
+       if (port->pm)
+               port->pm(port, state, oldstate);
+       else
+               serial8250_do_pm(port, state, oldstate);
 }
 
 static unsigned int serial8250_port_size(struct uart_8250_port *pt)
@@ -3006,6 +3008,7 @@ static int __devinit serial8250_probe(struct platform_device *dev)
                port.serial_in          = p->serial_in;
                port.serial_out         = p->serial_out;
                port.set_termios        = p->set_termios;
+               port.pm                 = p->pm;
                port.dev                = &dev->dev;
                port.irqflags           |= irqflag;
                ret = serial8250_register_port(&port);
@@ -3172,6 +3175,8 @@ int serial8250_register_port(struct uart_port *port)
                /*  Possibly override set_termios call */
                if (port->set_termios)
                        uart->port.set_termios = port->set_termios;
+               if (port->pm)
+                       uart->port.pm = port->pm;
 
                ret = uart_add_one_port(&serial8250_reg, &uart->port);
                if (ret == 0)

diff --git a/include/linux/serial_8250.h b/include/linux/serial_8250.h
index 7638dea..bf9c2bd 100644 (file)
--- a/include/linux/serial_8250.h
+++ b/include/linux/serial_8250.h
@@ -35,6 +35,8 @@ struct plat_serial8250_port {
        void            (*set_termios)(struct uart_port *,
                                       struct ktermios *new,
                                       struct ktermios *old);
+       void            (*pm)(struct uart_port *, unsigned int state,
+                             unsigned old);
 };
 
 /*
@@ -76,5 +78,7 @@ extern int serial8250_find_port_for_earlycon(void);
 extern int setup_early_serial8250_console(char *cmdline);
 extern void serial8250_do_set_termios(struct uart_port *port,
                struct ktermios *termios, struct ktermios *old);
+extern void serial8250_do_pm(struct uart_port *port, unsigned int state,
+                            unsigned int oldstate);
 
 #endif

diff --git a/include/linux/serial_core.h b/include/linux/serial_core.h
index ac48082..99e5994 100644 (file)
--- a/include/linux/serial_core.h
+++ b/include/linux/serial_core.h
@@ -289,6 +289,8 @@ struct uart_port {
        void                    (*set_termios)(struct uart_port *,
                                               struct ktermios *new,
                                               struct ktermios *old);
+       void                    (*pm)(struct uart_port *, unsigned int state,
+                                     unsigned int old);
        unsigned int            irq;                    /* irq number */
        unsigned long           irqflags;               /* irq flags  */
        unsigned int            uartclk;                /* base uart clock */