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path: root/drivers/usb/serial/generic.c
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Diffstat (limited to 'drivers/usb/serial/generic.c')
-rw-r--r--drivers/usb/serial/generic.c20
1 files changed, 20 insertions, 0 deletions
diff --git a/drivers/usb/serial/generic.c b/drivers/usb/serial/generic.c
index e6833e216fc..e4db5ad2bc5 100644
--- a/drivers/usb/serial/generic.c
+++ b/drivers/usb/serial/generic.c
@@ -479,6 +479,26 @@ int usb_serial_handle_break(struct usb_serial_port *port)
}
EXPORT_SYMBOL_GPL(usb_serial_handle_break);
+/**
+ * usb_serial_handle_dcd_change - handle a change of carrier detect state
+ * @port: usb_serial_port structure for the open port
+ * @tty: tty_struct structure for the port
+ * @status: new carrier detect status, nonzero if active
+ */
+void usb_serial_handle_dcd_change(struct usb_serial_port *usb_port,
+ struct tty_struct *tty, unsigned int status)
+{
+ struct tty_port *port = &usb_port->port;
+
+ dbg("%s - port %d, status %d", __func__, usb_port->number, status);
+
+ if (status)
+ wake_up_interruptible(&port->open_wait);
+ else if (tty && !C_CLOCAL(tty))
+ tty_hangup(tty);
+}
+EXPORT_SYMBOL_GPL(usb_serial_handle_dcd_change);
+
int usb_serial_generic_resume(struct usb_serial *serial)
{
struct usb_serial_port *port;