USB: suspend/resume support for usbtmc

a class driver should have suspend/resume. This makes sure we
don't see a virtual disconnect unnecessarily.

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

1 files changed, 14 insertions, 1 deletions

diff --git a/drivers/usb/class/usbtmc.c b/drivers/usb/class/usbtmc.c
index 0c9df97f6775..4f0858fbf980 100644
--- a/drivers/usb/class/usbtmc.c
+++ b/drivers/usb/class/usbtmc.c
@@ -1087,11 +1087,24 @@ static void usbtmc_disconnect(struct usb_interface *intf)
         kref_put(&data->kref, usbtmc_delete);
 }
 
+static int usbtmc_suspend (struct usb_interface *intf, pm_message_t message)
+{
+        /* this driver does not have pending URBs */
+        return 0;
+}
+
+static int usbtmc_resume (struct usb_interface *intf)
+{
+        return 0;
+}
+
 static struct usb_driver usbtmc_driver = {
         .name           = "usbtmc",
         .id_table       = usbtmc_devices,
         .probe          = usbtmc_probe,
-        .disconnect     = usbtmc_disconnect
+        .disconnect     = usbtmc_disconnect,
+        .suspend        = usbtmc_suspend,
+        .resume         = usbtmc_resume,
 };
 
 static int __init usbtmc_init(void)