USB: full power management support for the idmouse driver

usb: full runtime PM support for idmouse driver

- add suspend/resume support
- add reset_resume support
- add support for autosuspend

Signed-off-by: Oliver Neukum <oliver@neukum.org>
Tested-by: Andreas Deresch <aderesch@fs.tum.de>

1 files changed, 21 insertions, 0 deletions

diff --git a/drivers/usb/misc/idmouse.c b/drivers/usb/misc/idmouse.c
index 6da8887538c7..1337a9ce80b9 100644
--- a/drivers/usb/misc/idmouse.c
+++ b/drivers/usb/misc/idmouse.c
@@ -96,6 +96,8 @@ static int idmouse_probe(struct usb_interface *interface,
                                 const struct usb_device_id *id);
 
 static void idmouse_disconnect(struct usb_interface *interface);
+static int idmouse_suspend(struct usb_interface *intf, pm_message_t message);
+static int idmouse_resume(struct usb_interface *intf);
 
 /* file operation pointers */
 static const struct file_operations idmouse_fops = {
@@ -117,7 +119,11 @@ static struct usb_driver idmouse_driver = {
         .name = DRIVER_SHORT,
         .probe = idmouse_probe,
         .disconnect = idmouse_disconnect,
+        .suspend = idmouse_suspend,
+        .resume = idmouse_resume,
+        .reset_resume = idmouse_resume,
         .id_table = idmouse_table,
+        .supports_autosuspend = 1,
 };
 
 static int idmouse_create_image(struct usb_idmouse *dev)
@@ -197,6 +203,17 @@ reset:
         return result;
 }
 
+/* PM operations are nops as this driver does IO only during open() */
+static int idmouse_suspend(struct usb_interface *intf, pm_message_t message)
+{
+        return 0;
+}
+
+static int idmouse_resume(struct usb_interface *intf)
+{
+        return 0;
+}
+
 static inline void idmouse_delete(struct usb_idmouse *dev)
 {
         kfree(dev->bulk_in_buffer);
@@ -235,9 +252,13 @@ static int idmouse_open(struct inode *inode, struct file *file)
         } else {
 
                 /* create a new image and check for success */
+                result = usb_autopm_get_interface(interface);
+                if (result)
+                        goto error;
                 result = idmouse_create_image (dev);
                 if (result)
                         goto error;
+                usb_autopm_put_interface(interface);
 
                 /* increment our usage count for the driver */
                 ++dev->open;