USB: suspend support for usb serial

this implements generic support for suspend/resume for usb serial.

Signed-off-by: Oliver Neukum <oneukum@suse.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

1 files changed, 31 insertions, 0 deletions

diff --git a/drivers/usb/serial/usb-serial.c b/drivers/usb/serial/usb-serial.c
index 87f378806db6..e3e3728e16e3 100644
--- a/drivers/usb/serial/usb-serial.c
+++ b/drivers/usb/serial/usb-serial.c
@@ -46,6 +46,8 @@ static struct usb_driver usb_serial_driver = {
         .name =         "usbserial",
         .probe =        usb_serial_probe,
         .disconnect =   usb_serial_disconnect,
+        .suspend =      usb_serial_suspend,
+        .resume =       usb_serial_resume,
         .no_dynamic_id =        1,
 };
 
@@ -1069,6 +1071,35 @@ void usb_serial_disconnect(struct usb_interface *interface)
         dev_info(dev, "device disconnected\n");
 }
 
+int usb_serial_suspend(struct usb_interface *intf, pm_message_t message)
+{
+        struct usb_serial *serial = usb_get_intfdata(intf);
+        struct usb_serial_port *port;
+        int i, r = 0;
+
+        if (serial) {
+                for (i = 0; i < serial->num_ports; ++i) {
+                        port = serial->port[i];
+                        if (port)
+                                kill_traffic(port);
+                }
+        }
+
+        if (serial->type->suspend)
+                serial->type->suspend(serial, message);
+
+        return r;
+}
+EXPORT_SYMBOL(usb_serial_suspend);
+
+int usb_serial_resume(struct usb_interface *intf)
+{
+        struct usb_serial *serial = usb_get_intfdata(intf);
+
+        return serial->type->resume(serial);
+}
+EXPORT_SYMBOL(usb_serial_resume);
+
 static const struct tty_operations serial_ops = {
         .open =                 serial_open,
         .close =                serial_close,