-#ifdef CONFIG_USB_SUSPEND
-
-/* Internal routine to check whether we may autosuspend a device. */
-static int autosuspend_check(struct usb_device *udev, int reschedule)
-{
- int i;
- struct usb_interface *intf;
- unsigned long suspend_time, j;
-
- /* For autosuspend, fail fast if anything is in use or autosuspend
- * is disabled. Also fail if any interfaces require remote wakeup
- * but it isn't available.
- */
- if (udev->pm_usage_cnt > 0)
- return -EBUSY;
- if (udev->autosuspend_delay < 0 || udev->autosuspend_disabled)
- return -EPERM;
-
- suspend_time = udev->last_busy + udev->autosuspend_delay;
- if (udev->actconfig) {
- for (i = 0; i < udev->actconfig->desc.bNumInterfaces; i++) {
- intf = udev->actconfig->interface[i];
- if (!is_active(intf))
- continue;
- if (atomic_read(&intf->pm_usage_cnt) > 0)
- return -EBUSY;
- if (intf->needs_remote_wakeup &&
- !udev->do_remote_wakeup) {
- dev_dbg(&udev->dev, "remote wakeup needed "
- "for autosuspend\n");
- return -EOPNOTSUPP;
- }
-
- /* Don't allow autosuspend if the device will need
- * a reset-resume and any of its interface drivers
- * doesn't include support.
- */
- if (udev->quirks & USB_QUIRK_RESET_RESUME) {
- struct usb_driver *driver;
-
- driver = to_usb_driver(intf->dev.driver);
- if (!driver->reset_resume ||
- intf->needs_remote_wakeup)
- return -EOPNOTSUPP;
- }
- }
- }
-
- /* If everything is okay but the device hasn't been idle for long
- * enough, queue a delayed autosuspend request. If the device
- * _has_ been idle for long enough and the reschedule flag is set,
- * likewise queue a delayed (1 second) autosuspend request.
- */
- j = jiffies;
- if (time_before(j, suspend_time))
- reschedule = 1;
- else
- suspend_time = j + HZ;
- if (reschedule) {
- if (!timer_pending(&udev->autosuspend.timer)) {
- queue_delayed_work(ksuspend_usb_wq, &udev->autosuspend,
- round_jiffies_up_relative(suspend_time - j));
- }
- return -EAGAIN;
- }
- return 0;
-}
-
-#else
-
-static inline int autosuspend_check(struct usb_device *udev, int reschedule)
-{
- return 0;
-}
-
-#endif /* CONFIG_USB_SUSPEND */
-