TTY: serial, cleanup include file

There are some functions (uart_handle_dcd_change, _handle_cts_change,
_insert_char) which are big enough to not be inlined. So move them
from .h to .c. We need to export them so that modules can actually use
them.

They will be even bigger when we introduce tty refcounting to them.

While at it, cleanup the "Proud member of Uglyhacks'R'US". It means,
define uart_handle_sysrq_char only when SUPPORT_SYSRQ is set.
Otherwise define it as a macro. This is needed for some arm driver
where the second parameter is undefined if expanded.

Signed-off-by: Jiri Slaby <jslaby@suse.cz>
Cc: Alan Cox <alan@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

1 files changed, 82 insertions, 0 deletions

diff --git a/drivers/tty/serial/serial_core.c b/drivers/tty/serial/serial_core.c
index 0406d7ff505..8d825a36c84 100644
--- a/drivers/tty/serial/serial_core.c
+++ b/drivers/tty/serial/serial_core.c
@@ -22,6 +22,7 @@
  */
 #include <linux/module.h>
 #include <linux/tty.h>
+#include <linux/tty_flip.h>
 #include <linux/slab.h>
 #include <linux/init.h>
 #include <linux/console.h>
@@ -2467,6 +2468,87 @@ int uart_match_port(struct uart_port *port1, struct uart_port *port2)
 }
 EXPORT_SYMBOL(uart_match_port);
 
+/**
+ *	uart_handle_dcd_change - handle a change of carrier detect state
+ *	@uport: uart_port structure for the open port
+ *	@status: new carrier detect status, nonzero if active
+ */
+void uart_handle_dcd_change(struct uart_port *uport, unsigned int status)
+{
+	struct uart_state *state = uport->state;
+	struct tty_port *port = &state->port;
+	struct tty_ldisc *ld = tty_ldisc_ref(port->tty);
+	struct pps_event_time ts;
+
+	if (ld && ld->ops->dcd_change)
+		pps_get_ts(&ts);
+
+	uport->icount.dcd++;
+#ifdef CONFIG_HARD_PPS
+	if ((uport->flags & UPF_HARDPPS_CD) && status)
+		hardpps();
+#endif
+
+	if (port->flags & ASYNC_CHECK_CD) {
+		if (status)
+			wake_up_interruptible(&port->open_wait);
+		else if (port->tty)
+			tty_hangup(port->tty);
+	}
+
+	if (ld && ld->ops->dcd_change)
+		ld->ops->dcd_change(port->tty, status, &ts);
+	if (ld)
+		tty_ldisc_deref(ld);
+}
+EXPORT_SYMBOL_GPL(uart_handle_dcd_change);
+
+/**
+ *	uart_handle_cts_change - handle a change of clear-to-send state
+ *	@uport: uart_port structure for the open port
+ *	@status: new clear to send status, nonzero if active
+ */
+void uart_handle_cts_change(struct uart_port *uport, unsigned int status)
+{
+	struct tty_port *port = &uport->state->port;
+	struct tty_struct *tty = port->tty;
+
+	uport->icount.cts++;
+
+	if (port->flags & ASYNC_CTS_FLOW) {
+		if (tty->hw_stopped) {
+			if (status) {
+				tty->hw_stopped = 0;
+				uport->ops->start_tx(uport);
+				uart_write_wakeup(uport);
+			}
+		} else {
+			if (!status) {
+				tty->hw_stopped = 1;
+				uport->ops->stop_tx(uport);
+			}
+		}
+	}
+}
+EXPORT_SYMBOL_GPL(uart_handle_cts_change);
+
+void uart_insert_char(struct uart_port *port, unsigned int status,
+		 unsigned int overrun, unsigned int ch, unsigned int flag)
+{
+	struct tty_struct *tty = port->state->port.tty;
+
+	if ((status & port->ignore_status_mask & ~overrun) == 0)
+		tty_insert_flip_char(tty, ch, flag);
+
+	/*
+	 * Overrun is special.  Since it's reported immediately,
+	 * it doesn't affect the current character.
+	 */
+	if (status & ~port->ignore_status_mask & overrun)
+		tty_insert_flip_char(tty, 0, TTY_OVERRUN);
+}
+EXPORT_SYMBOL_GPL(uart_insert_char);
+
 EXPORT_SYMBOL(uart_write_wakeup);
 EXPORT_SYMBOL(uart_register_driver);
 EXPORT_SYMBOL(uart_unregister_driver);